Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2 | /* |
| 3 | rbd.c -- Export ceph rados objects as a Linux block device |
| 4 | |
| 5 | |
| 6 | based on drivers/block/osdblk.c: |
| 7 | |
| 8 | Copyright 2009 Red Hat, Inc. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; see the file COPYING. If not, write to |
| 21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | |
| 23 | |
| 24 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 25 | For usage instructions, please refer to: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 26 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 28 | |
| 29 | */ |
| 30 | |
| 31 | #include <linux/ceph/libceph.h> |
| 32 | #include <linux/ceph/osd_client.h> |
| 33 | #include <linux/ceph/mon_client.h> |
| 34 | #include <linux/ceph/decode.h> |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 35 | #include <linux/parser.h> |
Alex Elder | 30d1cff | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 36 | #include <linux/bsearch.h> |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 37 | |
| 38 | #include <linux/kernel.h> |
| 39 | #include <linux/device.h> |
| 40 | #include <linux/module.h> |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 41 | #include <linux/blk-mq.h> |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 42 | #include <linux/fs.h> |
| 43 | #include <linux/blkdev.h> |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 44 | #include <linux/slab.h> |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 45 | #include <linux/idr.h> |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 46 | #include <linux/workqueue.h> |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 47 | |
| 48 | #include "rbd_types.h" |
| 49 | |
Alex Elder | aafb230e | 2012-09-06 16:00:54 -0500 | [diff] [blame] | 50 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
| 51 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 52 | /* |
| 53 | * The basic unit of block I/O is a sector. It is interpreted in a |
| 54 | * number of contexts in Linux (blk, bio, genhd), but the default is |
| 55 | * universally 512 bytes. These symbols are just slightly more |
| 56 | * meaningful than the bare numbers they represent. |
| 57 | */ |
| 58 | #define SECTOR_SHIFT 9 |
| 59 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) |
| 60 | |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 61 | /* |
| 62 | * Increment the given counter and return its updated value. |
| 63 | * If the counter is already 0 it will not be incremented. |
| 64 | * If the counter is already at its maximum value returns |
| 65 | * -EINVAL without updating it. |
| 66 | */ |
| 67 | static int atomic_inc_return_safe(atomic_t *v) |
| 68 | { |
| 69 | unsigned int counter; |
| 70 | |
| 71 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); |
| 72 | if (counter <= (unsigned int)INT_MAX) |
| 73 | return (int)counter; |
| 74 | |
| 75 | atomic_dec(v); |
| 76 | |
| 77 | return -EINVAL; |
| 78 | } |
| 79 | |
| 80 | /* Decrement the counter. Return the resulting value, or -EINVAL */ |
| 81 | static int atomic_dec_return_safe(atomic_t *v) |
| 82 | { |
| 83 | int counter; |
| 84 | |
| 85 | counter = atomic_dec_return(v); |
| 86 | if (counter >= 0) |
| 87 | return counter; |
| 88 | |
| 89 | atomic_inc(v); |
| 90 | |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 94 | #define RBD_DRV_NAME "rbd" |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 95 | |
Ilya Dryomov | 7e513d4 | 2013-12-16 19:26:32 +0200 | [diff] [blame] | 96 | #define RBD_MINORS_PER_MAJOR 256 |
| 97 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 98 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 99 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
| 100 | |
Alex Elder | d4b125e | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 101 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
| 102 | #define RBD_MAX_SNAP_NAME_LEN \ |
| 103 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) |
| 104 | |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 105 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 106 | |
| 107 | #define RBD_SNAP_HEAD_NAME "-" |
| 108 | |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 109 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
| 110 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 111 | /* This allows a single page to hold an image name sent by OSD */ |
| 112 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 113 | #define RBD_IMAGE_ID_LEN_MAX 64 |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 114 | |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 115 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 116 | |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 117 | /* Feature bits */ |
| 118 | |
Alex Elder | 5cbf6f12 | 2013-04-11 09:29:48 -0500 | [diff] [blame] | 119 | #define RBD_FEATURE_LAYERING (1<<0) |
| 120 | #define RBD_FEATURE_STRIPINGV2 (1<<1) |
| 121 | #define RBD_FEATURES_ALL \ |
| 122 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 123 | |
| 124 | /* Features supported by this (client software) implementation. */ |
| 125 | |
Alex Elder | 770eba6 | 2012-10-25 23:34:40 -0500 | [diff] [blame] | 126 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 127 | |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 128 | /* |
| 129 | * An RBD device name will be "rbd#", where the "rbd" comes from |
| 130 | * RBD_DRV_NAME above, and # is a unique integer identifier. |
| 131 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big |
| 132 | * enough to hold all possible device names. |
| 133 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 134 | #define DEV_NAME_LEN 32 |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 135 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 136 | |
| 137 | /* |
| 138 | * block device image metadata (in-memory version) |
| 139 | */ |
| 140 | struct rbd_image_header { |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 141 | /* These six fields never change for a given rbd image */ |
Alex Elder | 849b426 | 2012-07-09 21:04:24 -0500 | [diff] [blame] | 142 | char *object_prefix; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 143 | __u8 obj_order; |
| 144 | __u8 crypt_type; |
| 145 | __u8 comp_type; |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 146 | u64 stripe_unit; |
| 147 | u64 stripe_count; |
| 148 | u64 features; /* Might be changeable someday? */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 149 | |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 150 | /* The remaining fields need to be updated occasionally */ |
| 151 | u64 image_size; |
| 152 | struct ceph_snap_context *snapc; |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 153 | char *snap_names; /* format 1 only */ |
| 154 | u64 *snap_sizes; /* format 1 only */ |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 155 | }; |
| 156 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 157 | /* |
| 158 | * An rbd image specification. |
| 159 | * |
| 160 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely |
Alex Elder | c66c6e0 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 161 | * identify an image. Each rbd_dev structure includes a pointer to |
| 162 | * an rbd_spec structure that encapsulates this identity. |
| 163 | * |
| 164 | * Each of the id's in an rbd_spec has an associated name. For a |
| 165 | * user-mapped image, the names are supplied and the id's associated |
| 166 | * with them are looked up. For a layered image, a parent image is |
| 167 | * defined by the tuple, and the names are looked up. |
| 168 | * |
| 169 | * An rbd_dev structure contains a parent_spec pointer which is |
| 170 | * non-null if the image it represents is a child in a layered |
| 171 | * image. This pointer will refer to the rbd_spec structure used |
| 172 | * by the parent rbd_dev for its own identity (i.e., the structure |
| 173 | * is shared between the parent and child). |
| 174 | * |
| 175 | * Since these structures are populated once, during the discovery |
| 176 | * phase of image construction, they are effectively immutable so |
| 177 | * we make no effort to synchronize access to them. |
| 178 | * |
| 179 | * Note that code herein does not assume the image name is known (it |
| 180 | * could be a null pointer). |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 181 | */ |
| 182 | struct rbd_spec { |
| 183 | u64 pool_id; |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 184 | const char *pool_name; |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 185 | |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 186 | const char *image_id; |
| 187 | const char *image_name; |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 188 | |
| 189 | u64 snap_id; |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 190 | const char *snap_name; |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 191 | |
| 192 | struct kref kref; |
| 193 | }; |
| 194 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 195 | /* |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 196 | * an instance of the client. multiple devices may share an rbd client. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 197 | */ |
| 198 | struct rbd_client { |
| 199 | struct ceph_client *client; |
| 200 | struct kref kref; |
| 201 | struct list_head node; |
| 202 | }; |
| 203 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 204 | struct rbd_img_request; |
| 205 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); |
| 206 | |
| 207 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ |
| 208 | |
| 209 | struct rbd_obj_request; |
| 210 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); |
| 211 | |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 212 | enum obj_request_type { |
| 213 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES |
| 214 | }; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 215 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 216 | enum obj_operation_type { |
| 217 | OBJ_OP_WRITE, |
| 218 | OBJ_OP_READ, |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 219 | OBJ_OP_DISCARD, |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 220 | }; |
| 221 | |
Alex Elder | 926f9b3 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 222 | enum obj_req_flags { |
| 223 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 224 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
Alex Elder | 5679c59 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 225 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
| 226 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ |
Alex Elder | 926f9b3 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 227 | }; |
| 228 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 229 | struct rbd_obj_request { |
| 230 | const char *object_name; |
| 231 | u64 offset; /* object start byte */ |
| 232 | u64 length; /* bytes from offset */ |
Alex Elder | 926f9b3 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 233 | unsigned long flags; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 234 | |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 235 | /* |
| 236 | * An object request associated with an image will have its |
| 237 | * img_data flag set; a standalone object request will not. |
| 238 | * |
| 239 | * A standalone object request will have which == BAD_WHICH |
| 240 | * and a null obj_request pointer. |
| 241 | * |
| 242 | * An object request initiated in support of a layered image |
| 243 | * object (to check for its existence before a write) will |
| 244 | * have which == BAD_WHICH and a non-null obj_request pointer. |
| 245 | * |
| 246 | * Finally, an object request for rbd image data will have |
| 247 | * which != BAD_WHICH, and will have a non-null img_request |
| 248 | * pointer. The value of which will be in the range |
| 249 | * 0..(img_request->obj_request_count-1). |
| 250 | */ |
| 251 | union { |
| 252 | struct rbd_obj_request *obj_request; /* STAT op */ |
| 253 | struct { |
| 254 | struct rbd_img_request *img_request; |
| 255 | u64 img_offset; |
| 256 | /* links for img_request->obj_requests list */ |
| 257 | struct list_head links; |
| 258 | }; |
| 259 | }; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 260 | u32 which; /* posn image request list */ |
| 261 | |
| 262 | enum obj_request_type type; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 263 | union { |
| 264 | struct bio *bio_list; |
| 265 | struct { |
| 266 | struct page **pages; |
| 267 | u32 page_count; |
| 268 | }; |
| 269 | }; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 270 | struct page **copyup_pages; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 271 | u32 copyup_page_count; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 272 | |
| 273 | struct ceph_osd_request *osd_req; |
| 274 | |
| 275 | u64 xferred; /* bytes transferred */ |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 276 | int result; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 277 | |
| 278 | rbd_obj_callback_t callback; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 279 | struct completion completion; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 280 | |
| 281 | struct kref kref; |
| 282 | }; |
| 283 | |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 284 | enum img_req_flags { |
Alex Elder | 9849e98 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 285 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
| 286 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
Alex Elder | d0b2e94 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 287 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 288 | IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 289 | }; |
| 290 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 291 | struct rbd_img_request { |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 292 | struct rbd_device *rbd_dev; |
| 293 | u64 offset; /* starting image byte offset */ |
| 294 | u64 length; /* byte count from offset */ |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 295 | unsigned long flags; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 296 | union { |
Alex Elder | 9849e98 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 297 | u64 snap_id; /* for reads */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 298 | struct ceph_snap_context *snapc; /* for writes */ |
Alex Elder | 9849e98 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 299 | }; |
| 300 | union { |
| 301 | struct request *rq; /* block request */ |
| 302 | struct rbd_obj_request *obj_request; /* obj req initiator */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 303 | }; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 304 | struct page **copyup_pages; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 305 | u32 copyup_page_count; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 306 | spinlock_t completion_lock;/* protects next_completion */ |
| 307 | u32 next_completion; |
| 308 | rbd_img_callback_t callback; |
Alex Elder | 55f27e0 | 2013-04-10 12:34:25 -0500 | [diff] [blame] | 309 | u64 xferred;/* aggregate bytes transferred */ |
Alex Elder | a5a337d | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 310 | int result; /* first nonzero obj_request result */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 311 | |
| 312 | u32 obj_request_count; |
| 313 | struct list_head obj_requests; /* rbd_obj_request structs */ |
| 314 | |
| 315 | struct kref kref; |
| 316 | }; |
| 317 | |
| 318 | #define for_each_obj_request(ireq, oreq) \ |
Alex Elder | ef06f4d3 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 319 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 320 | #define for_each_obj_request_from(ireq, oreq) \ |
Alex Elder | ef06f4d3 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 321 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 322 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
Alex Elder | ef06f4d3 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 323 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 324 | |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 325 | struct rbd_mapping { |
Alex Elder | 99c1f08 | 2012-08-30 14:42:15 -0500 | [diff] [blame] | 326 | u64 size; |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 327 | u64 features; |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 328 | bool read_only; |
| 329 | }; |
| 330 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 331 | /* |
| 332 | * a single device |
| 333 | */ |
| 334 | struct rbd_device { |
Alex Elder | de71a29 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 335 | int dev_id; /* blkdev unique id */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 336 | |
| 337 | int major; /* blkdev assigned major */ |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 338 | int minor; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 339 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 340 | |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 341 | u32 image_format; /* Either 1 or 2 */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 342 | struct rbd_client *rbd_client; |
| 343 | |
| 344 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
| 345 | |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 346 | spinlock_t lock; /* queue, flags, open_count */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 347 | |
| 348 | struct rbd_image_header header; |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 349 | unsigned long flags; /* possibly lock protected */ |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 350 | struct rbd_spec *spec; |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 351 | struct rbd_options *opts; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 352 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 353 | char *header_name; |
Alex Elder | 971f839 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 354 | |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 355 | struct ceph_file_layout layout; |
| 356 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 357 | struct ceph_osd_event *watch_event; |
Alex Elder | 975241a | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 358 | struct rbd_obj_request *watch_request; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 359 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 360 | struct rbd_spec *parent_spec; |
| 361 | u64 parent_overlap; |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 362 | atomic_t parent_ref; |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 363 | struct rbd_device *parent; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 364 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 365 | /* Block layer tags. */ |
| 366 | struct blk_mq_tag_set tag_set; |
| 367 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 368 | /* protects updating the header */ |
| 369 | struct rw_semaphore header_rwsem; |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 370 | |
| 371 | struct rbd_mapping mapping; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 372 | |
| 373 | struct list_head node; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 374 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 375 | /* sysfs related */ |
| 376 | struct device dev; |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 377 | unsigned long open_count; /* protected by lock */ |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 378 | }; |
| 379 | |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 380 | /* |
| 381 | * Flag bits for rbd_dev->flags. If atomicity is required, |
| 382 | * rbd_dev->lock is used to protect access. |
| 383 | * |
| 384 | * Currently, only the "removing" flag (which is coupled with the |
| 385 | * "open_count" field) requires atomic access. |
| 386 | */ |
Alex Elder | 6d29290 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 387 | enum rbd_dev_flags { |
| 388 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 389 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
Alex Elder | 6d29290 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 390 | }; |
| 391 | |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 392 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 393 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 394 | static LIST_HEAD(rbd_dev_list); /* devices */ |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 395 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
| 396 | |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 397 | static LIST_HEAD(rbd_client_list); /* clients */ |
| 398 | static DEFINE_SPINLOCK(rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 399 | |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 400 | /* Slab caches for frequently-allocated structures */ |
| 401 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 402 | static struct kmem_cache *rbd_img_request_cache; |
Alex Elder | 868311b | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 403 | static struct kmem_cache *rbd_obj_request_cache; |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 404 | static struct kmem_cache *rbd_segment_name_cache; |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 405 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 406 | static int rbd_major; |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 407 | static DEFINE_IDA(rbd_dev_id_ida); |
| 408 | |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 409 | static struct workqueue_struct *rbd_wq; |
| 410 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 411 | /* |
| 412 | * Default to false for now, as single-major requires >= 0.75 version of |
| 413 | * userspace rbd utility. |
| 414 | */ |
| 415 | static bool single_major = false; |
| 416 | module_param(single_major, bool, S_IRUGO); |
| 417 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); |
| 418 | |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 419 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
| 420 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 421 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
| 422 | size_t count); |
| 423 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, |
| 424 | size_t count); |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 425 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
| 426 | size_t count); |
| 427 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, |
| 428 | size_t count); |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 429 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 430 | static void rbd_spec_put(struct rbd_spec *spec); |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 431 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 432 | static int rbd_dev_id_to_minor(int dev_id) |
| 433 | { |
Ilya Dryomov | 7e513d4 | 2013-12-16 19:26:32 +0200 | [diff] [blame] | 434 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static int minor_to_rbd_dev_id(int minor) |
| 438 | { |
Ilya Dryomov | 7e513d4 | 2013-12-16 19:26:32 +0200 | [diff] [blame] | 439 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 440 | } |
| 441 | |
Greg Kroah-Hartman | b15a21d | 2013-08-23 14:24:28 -0700 | [diff] [blame] | 442 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
| 443 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 444 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
| 445 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); |
Greg Kroah-Hartman | b15a21d | 2013-08-23 14:24:28 -0700 | [diff] [blame] | 446 | |
| 447 | static struct attribute *rbd_bus_attrs[] = { |
| 448 | &bus_attr_add.attr, |
| 449 | &bus_attr_remove.attr, |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 450 | &bus_attr_add_single_major.attr, |
| 451 | &bus_attr_remove_single_major.attr, |
Greg Kroah-Hartman | b15a21d | 2013-08-23 14:24:28 -0700 | [diff] [blame] | 452 | NULL, |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 453 | }; |
Ilya Dryomov | 92c76dc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 454 | |
| 455 | static umode_t rbd_bus_is_visible(struct kobject *kobj, |
| 456 | struct attribute *attr, int index) |
| 457 | { |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 458 | if (!single_major && |
| 459 | (attr == &bus_attr_add_single_major.attr || |
| 460 | attr == &bus_attr_remove_single_major.attr)) |
| 461 | return 0; |
| 462 | |
Ilya Dryomov | 92c76dc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 463 | return attr->mode; |
| 464 | } |
| 465 | |
| 466 | static const struct attribute_group rbd_bus_group = { |
| 467 | .attrs = rbd_bus_attrs, |
| 468 | .is_visible = rbd_bus_is_visible, |
| 469 | }; |
| 470 | __ATTRIBUTE_GROUPS(rbd_bus); |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 471 | |
| 472 | static struct bus_type rbd_bus_type = { |
| 473 | .name = "rbd", |
Greg Kroah-Hartman | b15a21d | 2013-08-23 14:24:28 -0700 | [diff] [blame] | 474 | .bus_groups = rbd_bus_groups, |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 475 | }; |
| 476 | |
| 477 | static void rbd_root_dev_release(struct device *dev) |
| 478 | { |
| 479 | } |
| 480 | |
| 481 | static struct device rbd_root_dev = { |
| 482 | .init_name = "rbd", |
| 483 | .release = rbd_root_dev_release, |
| 484 | }; |
| 485 | |
Alex Elder | 06ecc6c | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 486 | static __printf(2, 3) |
| 487 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) |
| 488 | { |
| 489 | struct va_format vaf; |
| 490 | va_list args; |
| 491 | |
| 492 | va_start(args, fmt); |
| 493 | vaf.fmt = fmt; |
| 494 | vaf.va = &args; |
| 495 | |
| 496 | if (!rbd_dev) |
| 497 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); |
| 498 | else if (rbd_dev->disk) |
| 499 | printk(KERN_WARNING "%s: %s: %pV\n", |
| 500 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); |
| 501 | else if (rbd_dev->spec && rbd_dev->spec->image_name) |
| 502 | printk(KERN_WARNING "%s: image %s: %pV\n", |
| 503 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); |
| 504 | else if (rbd_dev->spec && rbd_dev->spec->image_id) |
| 505 | printk(KERN_WARNING "%s: id %s: %pV\n", |
| 506 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); |
| 507 | else /* punt */ |
| 508 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", |
| 509 | RBD_DRV_NAME, rbd_dev, &vaf); |
| 510 | va_end(args); |
| 511 | } |
| 512 | |
Alex Elder | aafb230e | 2012-09-06 16:00:54 -0500 | [diff] [blame] | 513 | #ifdef RBD_DEBUG |
| 514 | #define rbd_assert(expr) \ |
| 515 | if (unlikely(!(expr))) { \ |
| 516 | printk(KERN_ERR "\nAssertion failure in %s() " \ |
| 517 | "at line %d:\n\n" \ |
| 518 | "\trbd_assert(%s);\n\n", \ |
| 519 | __func__, __LINE__, #expr); \ |
| 520 | BUG(); \ |
| 521 | } |
| 522 | #else /* !RBD_DEBUG */ |
| 523 | # define rbd_assert(expr) ((void) 0) |
| 524 | #endif /* !RBD_DEBUG */ |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 525 | |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 526 | static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 527 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
Alex Elder | 05a46af | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 528 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
| 529 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 530 | |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 531 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 532 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
Ilya Dryomov | a720ae0 | 2014-07-23 17:11:19 +0400 | [diff] [blame] | 533 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 534 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 535 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| 536 | u64 snap_id); |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 537 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 538 | u8 *order, u64 *snap_size); |
| 539 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 540 | u64 *snap_features); |
| 541 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 542 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 543 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
| 544 | { |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 545 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 546 | bool removing = false; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 547 | |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 548 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 549 | return -EROFS; |
| 550 | |
Alex Elder | a14ea26 | 2013-02-05 13:23:12 -0600 | [diff] [blame] | 551 | spin_lock_irq(&rbd_dev->lock); |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 552 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
| 553 | removing = true; |
| 554 | else |
| 555 | rbd_dev->open_count++; |
Alex Elder | a14ea26 | 2013-02-05 13:23:12 -0600 | [diff] [blame] | 556 | spin_unlock_irq(&rbd_dev->lock); |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 557 | if (removing) |
| 558 | return -ENOENT; |
| 559 | |
Alex Elder | c3e946c | 2012-11-16 09:29:16 -0600 | [diff] [blame] | 560 | (void) get_device(&rbd_dev->dev); |
Alex Elder | 340c7a2 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 561 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 562 | return 0; |
| 563 | } |
| 564 | |
Al Viro | db2a144 | 2013-05-05 21:52:57 -0400 | [diff] [blame] | 565 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 566 | { |
| 567 | struct rbd_device *rbd_dev = disk->private_data; |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 568 | unsigned long open_count_before; |
| 569 | |
Alex Elder | a14ea26 | 2013-02-05 13:23:12 -0600 | [diff] [blame] | 570 | spin_lock_irq(&rbd_dev->lock); |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 571 | open_count_before = rbd_dev->open_count--; |
Alex Elder | a14ea26 | 2013-02-05 13:23:12 -0600 | [diff] [blame] | 572 | spin_unlock_irq(&rbd_dev->lock); |
Alex Elder | b82d167 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 573 | rbd_assert(open_count_before > 0); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 574 | |
Alex Elder | c3e946c | 2012-11-16 09:29:16 -0600 | [diff] [blame] | 575 | put_device(&rbd_dev->dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 576 | } |
| 577 | |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 578 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
| 579 | { |
Josh Durgin | 77f33c0 | 2013-09-30 17:09:54 -0700 | [diff] [blame] | 580 | int ret = 0; |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 581 | int val; |
| 582 | bool ro; |
Josh Durgin | 77f33c0 | 2013-09-30 17:09:54 -0700 | [diff] [blame] | 583 | bool ro_changed = false; |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 584 | |
Josh Durgin | 77f33c0 | 2013-09-30 17:09:54 -0700 | [diff] [blame] | 585 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 586 | if (get_user(val, (int __user *)(arg))) |
| 587 | return -EFAULT; |
| 588 | |
| 589 | ro = val ? true : false; |
| 590 | /* Snapshot doesn't allow to write*/ |
| 591 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
| 592 | return -EROFS; |
| 593 | |
Josh Durgin | 77f33c0 | 2013-09-30 17:09:54 -0700 | [diff] [blame] | 594 | spin_lock_irq(&rbd_dev->lock); |
| 595 | /* prevent others open this device */ |
| 596 | if (rbd_dev->open_count > 1) { |
| 597 | ret = -EBUSY; |
| 598 | goto out; |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 599 | } |
| 600 | |
Josh Durgin | 77f33c0 | 2013-09-30 17:09:54 -0700 | [diff] [blame] | 601 | if (rbd_dev->mapping.read_only != ro) { |
| 602 | rbd_dev->mapping.read_only = ro; |
| 603 | ro_changed = true; |
| 604 | } |
| 605 | |
| 606 | out: |
| 607 | spin_unlock_irq(&rbd_dev->lock); |
| 608 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ |
| 609 | if (ret == 0 && ro_changed) |
| 610 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); |
| 611 | |
| 612 | return ret; |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, |
| 616 | unsigned int cmd, unsigned long arg) |
| 617 | { |
| 618 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
| 619 | int ret = 0; |
| 620 | |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 621 | switch (cmd) { |
| 622 | case BLKROSET: |
| 623 | ret = rbd_ioctl_set_ro(rbd_dev, arg); |
| 624 | break; |
| 625 | default: |
| 626 | ret = -ENOTTY; |
| 627 | } |
| 628 | |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | #ifdef CONFIG_COMPAT |
| 633 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| 634 | unsigned int cmd, unsigned long arg) |
| 635 | { |
| 636 | return rbd_ioctl(bdev, mode, cmd, arg); |
| 637 | } |
| 638 | #endif /* CONFIG_COMPAT */ |
| 639 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 640 | static const struct block_device_operations rbd_bd_ops = { |
| 641 | .owner = THIS_MODULE, |
| 642 | .open = rbd_open, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 643 | .release = rbd_release, |
Guangliang Zhao | 131fd9f | 2013-09-24 11:25:36 +0800 | [diff] [blame] | 644 | .ioctl = rbd_ioctl, |
| 645 | #ifdef CONFIG_COMPAT |
| 646 | .compat_ioctl = rbd_compat_ioctl, |
| 647 | #endif |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 648 | }; |
| 649 | |
| 650 | /* |
Alex Elder | 7262cfc | 2013-05-16 15:04:20 -0500 | [diff] [blame] | 651 | * Initialize an rbd client instance. Success or not, this function |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 652 | * consumes ceph_opts. Caller holds client_mutex. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 653 | */ |
Alex Elder | f8c3892 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 654 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 655 | { |
| 656 | struct rbd_client *rbdc; |
| 657 | int ret = -ENOMEM; |
| 658 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 659 | dout("%s:\n", __func__); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 660 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| 661 | if (!rbdc) |
| 662 | goto out_opt; |
| 663 | |
| 664 | kref_init(&rbdc->kref); |
| 665 | INIT_LIST_HEAD(&rbdc->node); |
| 666 | |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 667 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 668 | if (IS_ERR(rbdc->client)) |
Alex Elder | 08f7546 | 2013-05-29 11:19:00 -0500 | [diff] [blame] | 669 | goto out_rbdc; |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 670 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 671 | |
| 672 | ret = ceph_open_session(rbdc->client); |
| 673 | if (ret < 0) |
Alex Elder | 08f7546 | 2013-05-29 11:19:00 -0500 | [diff] [blame] | 674 | goto out_client; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 675 | |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 676 | spin_lock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 677 | list_add_tail(&rbdc->node, &rbd_client_list); |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 678 | spin_unlock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 679 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 680 | dout("%s: rbdc %p\n", __func__, rbdc); |
Alex Elder | bc534d8 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 681 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 682 | return rbdc; |
Alex Elder | 08f7546 | 2013-05-29 11:19:00 -0500 | [diff] [blame] | 683 | out_client: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 684 | ceph_destroy_client(rbdc->client); |
Alex Elder | 08f7546 | 2013-05-29 11:19:00 -0500 | [diff] [blame] | 685 | out_rbdc: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 686 | kfree(rbdc); |
| 687 | out_opt: |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 688 | if (ceph_opts) |
| 689 | ceph_destroy_options(ceph_opts); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 690 | dout("%s: error %d\n", __func__, ret); |
| 691 | |
Vasiliy Kulikov | 28f259b | 2010-09-26 12:59:37 +0400 | [diff] [blame] | 692 | return ERR_PTR(ret); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 693 | } |
| 694 | |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 695 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
| 696 | { |
| 697 | kref_get(&rbdc->kref); |
| 698 | |
| 699 | return rbdc; |
| 700 | } |
| 701 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 702 | /* |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 703 | * Find a ceph client with specific addr and configuration. If |
| 704 | * found, bump its reference count. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 705 | */ |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 706 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 707 | { |
| 708 | struct rbd_client *client_node; |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 709 | bool found = false; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 710 | |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 711 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 712 | return NULL; |
| 713 | |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 714 | spin_lock(&rbd_client_list_lock); |
| 715 | list_for_each_entry(client_node, &rbd_client_list, node) { |
| 716 | if (!ceph_compare_options(ceph_opts, client_node->client)) { |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 717 | __rbd_get_client(client_node); |
| 718 | |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 719 | found = true; |
| 720 | break; |
| 721 | } |
| 722 | } |
| 723 | spin_unlock(&rbd_client_list_lock); |
| 724 | |
| 725 | return found ? client_node : NULL; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | /* |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 729 | * (Per device) rbd map options |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 730 | */ |
| 731 | enum { |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 732 | Opt_queue_depth, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 733 | Opt_last_int, |
| 734 | /* int args above */ |
| 735 | Opt_last_string, |
| 736 | /* string args above */ |
Alex Elder | cc0538b | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 737 | Opt_read_only, |
| 738 | Opt_read_write, |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 739 | Opt_err |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 740 | }; |
| 741 | |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 742 | static match_table_t rbd_opts_tokens = { |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 743 | {Opt_queue_depth, "queue_depth=%d"}, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 744 | /* int args above */ |
| 745 | /* string args above */ |
Alex Elder | be466c1 | 2012-10-22 11:31:26 -0500 | [diff] [blame] | 746 | {Opt_read_only, "read_only"}, |
Alex Elder | cc0538b | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 747 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
| 748 | {Opt_read_write, "read_write"}, |
| 749 | {Opt_read_write, "rw"}, /* Alternate spelling */ |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 750 | {Opt_err, NULL} |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 751 | }; |
| 752 | |
Alex Elder | 98571b5 | 2013-01-20 14:44:42 -0600 | [diff] [blame] | 753 | struct rbd_options { |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 754 | int queue_depth; |
Alex Elder | 98571b5 | 2013-01-20 14:44:42 -0600 | [diff] [blame] | 755 | bool read_only; |
| 756 | }; |
| 757 | |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 758 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
Alex Elder | 98571b5 | 2013-01-20 14:44:42 -0600 | [diff] [blame] | 759 | #define RBD_READ_ONLY_DEFAULT false |
| 760 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 761 | static int parse_rbd_opts_token(char *c, void *private) |
| 762 | { |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 763 | struct rbd_options *rbd_opts = private; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 764 | substring_t argstr[MAX_OPT_ARGS]; |
| 765 | int token, intval, ret; |
| 766 | |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 767 | token = match_token(c, rbd_opts_tokens, argstr); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 768 | if (token < Opt_last_int) { |
| 769 | ret = match_int(&argstr[0], &intval); |
| 770 | if (ret < 0) { |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 771 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 772 | return ret; |
| 773 | } |
| 774 | dout("got int token %d val %d\n", token, intval); |
| 775 | } else if (token > Opt_last_int && token < Opt_last_string) { |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 776 | dout("got string token %d val %s\n", token, argstr[0].from); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 777 | } else { |
| 778 | dout("got token %d\n", token); |
| 779 | } |
| 780 | |
| 781 | switch (token) { |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 782 | case Opt_queue_depth: |
| 783 | if (intval < 1) { |
| 784 | pr_err("queue_depth out of range\n"); |
| 785 | return -EINVAL; |
| 786 | } |
| 787 | rbd_opts->queue_depth = intval; |
| 788 | break; |
Alex Elder | cc0538b | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 789 | case Opt_read_only: |
| 790 | rbd_opts->read_only = true; |
| 791 | break; |
| 792 | case Opt_read_write: |
| 793 | rbd_opts->read_only = false; |
| 794 | break; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 795 | default: |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 796 | /* libceph prints "bad option" msg */ |
| 797 | return -EINVAL; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 798 | } |
Ilya Dryomov | 210c104 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 799 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 800 | return 0; |
| 801 | } |
| 802 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 803 | static char* obj_op_name(enum obj_operation_type op_type) |
| 804 | { |
| 805 | switch (op_type) { |
| 806 | case OBJ_OP_READ: |
| 807 | return "read"; |
| 808 | case OBJ_OP_WRITE: |
| 809 | return "write"; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 810 | case OBJ_OP_DISCARD: |
| 811 | return "discard"; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 812 | default: |
| 813 | return "???"; |
| 814 | } |
| 815 | } |
| 816 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 817 | /* |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 818 | * Get a ceph client with specific addr and configuration, if one does |
Alex Elder | 7262cfc | 2013-05-16 15:04:20 -0500 | [diff] [blame] | 819 | * not exist create it. Either way, ceph_opts is consumed by this |
| 820 | * function. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 821 | */ |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 822 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 823 | { |
Alex Elder | f8c3892 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 824 | struct rbd_client *rbdc; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 825 | |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 826 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
Alex Elder | 1f7ba33 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 827 | rbdc = rbd_client_find(ceph_opts); |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 828 | if (rbdc) /* using an existing client */ |
Alex Elder | 43ae470 | 2012-07-03 16:01:18 -0500 | [diff] [blame] | 829 | ceph_destroy_options(ceph_opts); |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 830 | else |
Alex Elder | f8c3892 | 2012-08-10 13:12:07 -0700 | [diff] [blame] | 831 | rbdc = rbd_client_create(ceph_opts); |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 832 | mutex_unlock(&client_mutex); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 833 | |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 834 | return rbdc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Destroy ceph client |
Alex Elder | d23a4b3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 839 | * |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 840 | * Caller must hold rbd_client_list_lock. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 841 | */ |
| 842 | static void rbd_client_release(struct kref *kref) |
| 843 | { |
| 844 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
| 845 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 846 | dout("%s: rbdc %p\n", __func__, rbdc); |
Alex Elder | cd9d9f5 | 2012-04-04 13:35:44 -0500 | [diff] [blame] | 847 | spin_lock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 848 | list_del(&rbdc->node); |
Alex Elder | cd9d9f5 | 2012-04-04 13:35:44 -0500 | [diff] [blame] | 849 | spin_unlock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 850 | |
| 851 | ceph_destroy_client(rbdc->client); |
| 852 | kfree(rbdc); |
| 853 | } |
| 854 | |
| 855 | /* |
| 856 | * Drop reference to ceph client node. If it's not referenced anymore, release |
| 857 | * it. |
| 858 | */ |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 859 | static void rbd_put_client(struct rbd_client *rbdc) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 860 | { |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 861 | if (rbdc) |
| 862 | kref_put(&rbdc->kref, rbd_client_release); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 863 | } |
| 864 | |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 865 | static bool rbd_image_format_valid(u32 image_format) |
| 866 | { |
| 867 | return image_format == 1 || image_format == 2; |
| 868 | } |
| 869 | |
Alex Elder | 8e94af8 | 2012-07-25 09:32:40 -0500 | [diff] [blame] | 870 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
| 871 | { |
Alex Elder | 103a150 | 2012-08-02 11:29:45 -0500 | [diff] [blame] | 872 | size_t size; |
| 873 | u32 snap_count; |
| 874 | |
| 875 | /* The header has to start with the magic rbd header text */ |
| 876 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) |
| 877 | return false; |
| 878 | |
Alex Elder | db2388b | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 879 | /* The bio layer requires at least sector-sized I/O */ |
| 880 | |
| 881 | if (ondisk->options.order < SECTOR_SHIFT) |
| 882 | return false; |
| 883 | |
| 884 | /* If we use u64 in a few spots we may be able to loosen this */ |
| 885 | |
| 886 | if (ondisk->options.order > 8 * sizeof (int) - 1) |
| 887 | return false; |
| 888 | |
Alex Elder | 103a150 | 2012-08-02 11:29:45 -0500 | [diff] [blame] | 889 | /* |
| 890 | * The size of a snapshot header has to fit in a size_t, and |
| 891 | * that limits the number of snapshots. |
| 892 | */ |
| 893 | snap_count = le32_to_cpu(ondisk->snap_count); |
| 894 | size = SIZE_MAX - sizeof (struct ceph_snap_context); |
| 895 | if (snap_count > size / sizeof (__le64)) |
| 896 | return false; |
| 897 | |
| 898 | /* |
| 899 | * Not only that, but the size of the entire the snapshot |
| 900 | * header must also be representable in a size_t. |
| 901 | */ |
| 902 | size -= snap_count * sizeof (__le64); |
| 903 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) |
| 904 | return false; |
| 905 | |
| 906 | return true; |
Alex Elder | 8e94af8 | 2012-07-25 09:32:40 -0500 | [diff] [blame] | 907 | } |
| 908 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 909 | /* |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 910 | * Fill an rbd image header with information from the given format 1 |
| 911 | * on-disk header. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 912 | */ |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 913 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 914 | struct rbd_image_header_ondisk *ondisk) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 915 | { |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 916 | struct rbd_image_header *header = &rbd_dev->header; |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 917 | bool first_time = header->object_prefix == NULL; |
| 918 | struct ceph_snap_context *snapc; |
| 919 | char *object_prefix = NULL; |
| 920 | char *snap_names = NULL; |
| 921 | u64 *snap_sizes = NULL; |
Alex Elder | ccece23 | 2012-07-10 20:30:10 -0500 | [diff] [blame] | 922 | u32 snap_count; |
Alex Elder | d2bb24e | 2012-07-26 23:37:14 -0500 | [diff] [blame] | 923 | size_t size; |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 924 | int ret = -ENOMEM; |
Alex Elder | 621901d | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 925 | u32 i; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 926 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 927 | /* Allocate this now to avoid having to handle failure below */ |
| 928 | |
| 929 | if (first_time) { |
| 930 | size_t len; |
| 931 | |
| 932 | len = strnlen(ondisk->object_prefix, |
| 933 | sizeof (ondisk->object_prefix)); |
| 934 | object_prefix = kmalloc(len + 1, GFP_KERNEL); |
| 935 | if (!object_prefix) |
| 936 | return -ENOMEM; |
| 937 | memcpy(object_prefix, ondisk->object_prefix, len); |
| 938 | object_prefix[len] = '\0'; |
| 939 | } |
| 940 | |
| 941 | /* Allocate the snapshot context and fill it in */ |
Alex Elder | 6a52325 | 2012-07-19 17:12:59 -0500 | [diff] [blame] | 942 | |
Alex Elder | 103a150 | 2012-08-02 11:29:45 -0500 | [diff] [blame] | 943 | snap_count = le32_to_cpu(ondisk->snap_count); |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 944 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
| 945 | if (!snapc) |
| 946 | goto out_err; |
| 947 | snapc->seq = le64_to_cpu(ondisk->snap_seq); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 948 | if (snap_count) { |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 949 | struct rbd_image_snap_ondisk *snaps; |
Alex Elder | f785cc1 | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 950 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
| 951 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 952 | /* We'll keep a copy of the snapshot names... */ |
Alex Elder | 621901d | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 953 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 954 | if (snap_names_len > (u64)SIZE_MAX) |
| 955 | goto out_2big; |
| 956 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
| 957 | if (!snap_names) |
Alex Elder | 6a52325 | 2012-07-19 17:12:59 -0500 | [diff] [blame] | 958 | goto out_err; |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 959 | |
| 960 | /* ...as well as the array of their sizes. */ |
| 961 | |
| 962 | size = snap_count * sizeof (*header->snap_sizes); |
| 963 | snap_sizes = kmalloc(size, GFP_KERNEL); |
| 964 | if (!snap_sizes) |
| 965 | goto out_err; |
| 966 | |
Alex Elder | f785cc1 | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 967 | /* |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 968 | * Copy the names, and fill in each snapshot's id |
| 969 | * and size. |
| 970 | * |
Alex Elder | 99a41eb | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 971 | * Note that rbd_dev_v1_header_info() guarantees the |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 972 | * ondisk buffer we're working with has |
Alex Elder | f785cc1 | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 973 | * snap_names_len bytes beyond the end of the |
| 974 | * snapshot id array, this memcpy() is safe. |
| 975 | */ |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 976 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
| 977 | snaps = ondisk->snaps; |
| 978 | for (i = 0; i < snap_count; i++) { |
| 979 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); |
| 980 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); |
| 981 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 982 | } |
Alex Elder | 849b426 | 2012-07-09 21:04:24 -0500 | [diff] [blame] | 983 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 984 | /* We won't fail any more, fill in the header */ |
Alex Elder | 6a52325 | 2012-07-19 17:12:59 -0500 | [diff] [blame] | 985 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 986 | if (first_time) { |
| 987 | header->object_prefix = object_prefix; |
| 988 | header->obj_order = ondisk->options.order; |
| 989 | header->crypt_type = ondisk->options.crypt_type; |
| 990 | header->comp_type = ondisk->options.comp_type; |
| 991 | /* The rest aren't used for format 1 images */ |
| 992 | header->stripe_unit = 0; |
| 993 | header->stripe_count = 0; |
| 994 | header->features = 0; |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 995 | } else { |
| 996 | ceph_put_snap_context(header->snapc); |
| 997 | kfree(header->snap_names); |
| 998 | kfree(header->snap_sizes); |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | /* The remaining fields always get updated (when we refresh) */ |
Alex Elder | 621901d | 2012-08-23 23:22:06 -0500 | [diff] [blame] | 1002 | |
Alex Elder | f84344f | 2012-08-31 17:29:51 -0500 | [diff] [blame] | 1003 | header->image_size = le64_to_cpu(ondisk->image_size); |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 1004 | header->snapc = snapc; |
| 1005 | header->snap_names = snap_names; |
| 1006 | header->snap_sizes = snap_sizes; |
Alex Elder | 468521c | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 1007 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1008 | return 0; |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 1009 | out_2big: |
| 1010 | ret = -EIO; |
Alex Elder | 6a52325 | 2012-07-19 17:12:59 -0500 | [diff] [blame] | 1011 | out_err: |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 1012 | kfree(snap_sizes); |
| 1013 | kfree(snap_names); |
| 1014 | ceph_put_snap_context(snapc); |
| 1015 | kfree(object_prefix); |
Alex Elder | ccece23 | 2012-07-10 20:30:10 -0500 | [diff] [blame] | 1016 | |
Alex Elder | bb23e37 | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 1017 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1018 | } |
| 1019 | |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1020 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
| 1021 | { |
| 1022 | const char *snap_name; |
| 1023 | |
| 1024 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
| 1025 | |
| 1026 | /* Skip over names until we find the one we are looking for */ |
| 1027 | |
| 1028 | snap_name = rbd_dev->header.snap_names; |
| 1029 | while (which--) |
| 1030 | snap_name += strlen(snap_name) + 1; |
| 1031 | |
| 1032 | return kstrdup(snap_name, GFP_KERNEL); |
| 1033 | } |
| 1034 | |
Alex Elder | 30d1cff | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 1035 | /* |
| 1036 | * Snapshot id comparison function for use with qsort()/bsearch(). |
| 1037 | * Note that result is for snapshots in *descending* order. |
| 1038 | */ |
| 1039 | static int snapid_compare_reverse(const void *s1, const void *s2) |
| 1040 | { |
| 1041 | u64 snap_id1 = *(u64 *)s1; |
| 1042 | u64 snap_id2 = *(u64 *)s2; |
| 1043 | |
| 1044 | if (snap_id1 < snap_id2) |
| 1045 | return 1; |
| 1046 | return snap_id1 == snap_id2 ? 0 : -1; |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * Search a snapshot context to see if the given snapshot id is |
| 1051 | * present. |
| 1052 | * |
| 1053 | * Returns the position of the snapshot id in the array if it's found, |
| 1054 | * or BAD_SNAP_INDEX otherwise. |
| 1055 | * |
| 1056 | * Note: The snapshot array is in kept sorted (by the osd) in |
| 1057 | * reverse order, highest snapshot id first. |
| 1058 | */ |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1059 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
| 1060 | { |
| 1061 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
Alex Elder | 30d1cff | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 1062 | u64 *found; |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1063 | |
Alex Elder | 30d1cff | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 1064 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
| 1065 | sizeof (snap_id), snapid_compare_reverse); |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1066 | |
Alex Elder | 30d1cff | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 1067 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
Alex Elder | 9682fc6 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1068 | } |
| 1069 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1070 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
| 1071 | u64 snap_id) |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1072 | { |
| 1073 | u32 which; |
Josh Durgin | da6a6b6 | 2013-09-04 17:57:31 -0700 | [diff] [blame] | 1074 | const char *snap_name; |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1075 | |
| 1076 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
| 1077 | if (which == BAD_SNAP_INDEX) |
Josh Durgin | da6a6b6 | 2013-09-04 17:57:31 -0700 | [diff] [blame] | 1078 | return ERR_PTR(-ENOENT); |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1079 | |
Josh Durgin | da6a6b6 | 2013-09-04 17:57:31 -0700 | [diff] [blame] | 1080 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
| 1081 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1082 | } |
| 1083 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 1084 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
| 1085 | { |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 1086 | if (snap_id == CEPH_NOSNAP) |
| 1087 | return RBD_SNAP_HEAD_NAME; |
| 1088 | |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1089 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1090 | if (rbd_dev->image_format == 1) |
| 1091 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 1092 | |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1093 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 1094 | } |
| 1095 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1096 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 1097 | u64 *snap_size) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1098 | { |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1099 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1100 | if (snap_id == CEPH_NOSNAP) { |
| 1101 | *snap_size = rbd_dev->header.image_size; |
| 1102 | } else if (rbd_dev->image_format == 1) { |
| 1103 | u32 which; |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1104 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1105 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
| 1106 | if (which == BAD_SNAP_INDEX) |
| 1107 | return -ENOENT; |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1108 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1109 | *snap_size = rbd_dev->header.snap_sizes[which]; |
| 1110 | } else { |
| 1111 | u64 size = 0; |
| 1112 | int ret; |
| 1113 | |
| 1114 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
| 1115 | if (ret) |
| 1116 | return ret; |
| 1117 | |
| 1118 | *snap_size = size; |
| 1119 | } |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
| 1123 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 1124 | u64 *snap_features) |
| 1125 | { |
| 1126 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1127 | if (snap_id == CEPH_NOSNAP) { |
| 1128 | *snap_features = rbd_dev->header.features; |
| 1129 | } else if (rbd_dev->image_format == 1) { |
| 1130 | *snap_features = 0; /* No features for format 1 */ |
| 1131 | } else { |
| 1132 | u64 features = 0; |
| 1133 | int ret; |
| 1134 | |
| 1135 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
| 1136 | if (ret) |
| 1137 | return ret; |
| 1138 | |
| 1139 | *snap_features = features; |
| 1140 | } |
| 1141 | return 0; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
Alex Elder | d1cf578 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 1144 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1145 | { |
Alex Elder | 8f4b7d9 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 1146 | u64 snap_id = rbd_dev->spec->snap_id; |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1147 | u64 size = 0; |
| 1148 | u64 features = 0; |
| 1149 | int ret; |
Alex Elder | 8b0241f | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 1150 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 1151 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
| 1152 | if (ret) |
| 1153 | return ret; |
| 1154 | ret = rbd_snap_features(rbd_dev, snap_id, &features); |
| 1155 | if (ret) |
| 1156 | return ret; |
| 1157 | |
| 1158 | rbd_dev->mapping.size = size; |
| 1159 | rbd_dev->mapping.features = features; |
| 1160 | |
Alex Elder | 8b0241f | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 1161 | return 0; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1162 | } |
| 1163 | |
Alex Elder | d1cf578 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 1164 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
| 1165 | { |
| 1166 | rbd_dev->mapping.size = 0; |
| 1167 | rbd_dev->mapping.features = 0; |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 1168 | } |
| 1169 | |
Himangi Saraogi | 7d5079a | 2014-07-24 03:17:07 +0530 | [diff] [blame] | 1170 | static void rbd_segment_name_free(const char *name) |
| 1171 | { |
| 1172 | /* The explicit cast here is needed to drop the const qualifier */ |
| 1173 | |
| 1174 | kmem_cache_free(rbd_segment_name_cache, (void *)name); |
| 1175 | } |
| 1176 | |
Alex Elder | 98571b5 | 2013-01-20 14:44:42 -0600 | [diff] [blame] | 1177 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1178 | { |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1179 | char *name; |
| 1180 | u64 segment; |
| 1181 | int ret; |
Josh Durgin | 3a96d5c | 2013-06-12 19:15:06 -0700 | [diff] [blame] | 1182 | char *name_format; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1183 | |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 1184 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1185 | if (!name) |
| 1186 | return NULL; |
| 1187 | segment = offset >> rbd_dev->header.obj_order; |
Josh Durgin | 3a96d5c | 2013-06-12 19:15:06 -0700 | [diff] [blame] | 1188 | name_format = "%s.%012llx"; |
| 1189 | if (rbd_dev->image_format == 2) |
| 1190 | name_format = "%s.%016llx"; |
Ilya Dryomov | 2d0ebc5 | 2014-01-27 17:40:18 +0200 | [diff] [blame] | 1191 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1192 | rbd_dev->header.object_prefix, segment); |
Ilya Dryomov | 2d0ebc5 | 2014-01-27 17:40:18 +0200 | [diff] [blame] | 1193 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1194 | pr_err("error formatting segment name for #%llu (%d)\n", |
| 1195 | segment, ret); |
Himangi Saraogi | 7d5079a | 2014-07-24 03:17:07 +0530 | [diff] [blame] | 1196 | rbd_segment_name_free(name); |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1197 | name = NULL; |
| 1198 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1199 | |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1200 | return name; |
| 1201 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1202 | |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1203 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
| 1204 | { |
| 1205 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1206 | |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1207 | return offset & (segment_size - 1); |
| 1208 | } |
| 1209 | |
| 1210 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, |
| 1211 | u64 offset, u64 length) |
| 1212 | { |
| 1213 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
| 1214 | |
| 1215 | offset &= segment_size - 1; |
| 1216 | |
Alex Elder | aafb230e | 2012-09-06 16:00:54 -0500 | [diff] [blame] | 1217 | rbd_assert(length <= U64_MAX - offset); |
Alex Elder | 65ccfe2 | 2012-08-09 10:33:26 -0700 | [diff] [blame] | 1218 | if (offset + length > segment_size) |
| 1219 | length = segment_size - offset; |
| 1220 | |
| 1221 | return length; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
| 1224 | /* |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 1225 | * returns the size of an object in the image |
| 1226 | */ |
| 1227 | static u64 rbd_obj_bytes(struct rbd_image_header *header) |
| 1228 | { |
| 1229 | return 1 << header->obj_order; |
| 1230 | } |
| 1231 | |
| 1232 | /* |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1233 | * bio helpers |
| 1234 | */ |
| 1235 | |
| 1236 | static void bio_chain_put(struct bio *chain) |
| 1237 | { |
| 1238 | struct bio *tmp; |
| 1239 | |
| 1240 | while (chain) { |
| 1241 | tmp = chain; |
| 1242 | chain = chain->bi_next; |
| 1243 | bio_put(tmp); |
| 1244 | } |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * zeros a bio chain, starting at specific offset |
| 1249 | */ |
| 1250 | static void zero_bio_chain(struct bio *chain, int start_ofs) |
| 1251 | { |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 1252 | struct bio_vec bv; |
| 1253 | struct bvec_iter iter; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1254 | unsigned long flags; |
| 1255 | void *buf; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1256 | int pos = 0; |
| 1257 | |
| 1258 | while (chain) { |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 1259 | bio_for_each_segment(bv, chain, iter) { |
| 1260 | if (pos + bv.bv_len > start_ofs) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1261 | int remainder = max(start_ofs - pos, 0); |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 1262 | buf = bvec_kmap_irq(&bv, &flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1263 | memset(buf + remainder, 0, |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 1264 | bv.bv_len - remainder); |
| 1265 | flush_dcache_page(bv.bv_page); |
Dan Carpenter | 85b5aaa | 2010-10-11 21:15:11 +0200 | [diff] [blame] | 1266 | bvec_kunmap_irq(buf, &flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1267 | } |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 1268 | pos += bv.bv_len; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1269 | } |
| 1270 | |
| 1271 | chain = chain->bi_next; |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | /* |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1276 | * similar to zero_bio_chain(), zeros data defined by a page array, |
| 1277 | * starting at the given byte offset from the start of the array and |
| 1278 | * continuing up to the given end offset. The pages array is |
| 1279 | * assumed to be big enough to hold all bytes up to the end. |
| 1280 | */ |
| 1281 | static void zero_pages(struct page **pages, u64 offset, u64 end) |
| 1282 | { |
| 1283 | struct page **page = &pages[offset >> PAGE_SHIFT]; |
| 1284 | |
| 1285 | rbd_assert(end > offset); |
| 1286 | rbd_assert(end - offset <= (u64)SIZE_MAX); |
| 1287 | while (offset < end) { |
| 1288 | size_t page_offset; |
| 1289 | size_t length; |
| 1290 | unsigned long flags; |
| 1291 | void *kaddr; |
| 1292 | |
Geert Uytterhoeven | 491205a | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 1293 | page_offset = offset & ~PAGE_MASK; |
| 1294 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1295 | local_irq_save(flags); |
| 1296 | kaddr = kmap_atomic(*page); |
| 1297 | memset(kaddr + page_offset, 0, length); |
Alex Elder | e215605 | 2013-05-22 20:54:25 -0500 | [diff] [blame] | 1298 | flush_dcache_page(*page); |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1299 | kunmap_atomic(kaddr); |
| 1300 | local_irq_restore(flags); |
| 1301 | |
| 1302 | offset += length; |
| 1303 | page++; |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | /* |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1308 | * Clone a portion of a bio, starting at the given byte offset |
| 1309 | * and continuing for the number of bytes indicated. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1310 | */ |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1311 | static struct bio *bio_clone_range(struct bio *bio_src, |
| 1312 | unsigned int offset, |
| 1313 | unsigned int len, |
| 1314 | gfp_t gfpmask) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1315 | { |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1316 | struct bio *bio; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1317 | |
Kent Overstreet | 5341a62 | 2013-08-07 14:31:11 -0700 | [diff] [blame] | 1318 | bio = bio_clone(bio_src, gfpmask); |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1319 | if (!bio) |
| 1320 | return NULL; /* ENOMEM */ |
| 1321 | |
Kent Overstreet | 5341a62 | 2013-08-07 14:31:11 -0700 | [diff] [blame] | 1322 | bio_advance(bio, offset); |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1323 | bio->bi_iter.bi_size = len; |
Alex Elder | 542582f | 2012-08-09 10:33:25 -0700 | [diff] [blame] | 1324 | |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1325 | return bio; |
| 1326 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1327 | |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1328 | /* |
| 1329 | * Clone a portion of a bio chain, starting at the given byte offset |
| 1330 | * into the first bio in the source chain and continuing for the |
| 1331 | * number of bytes indicated. The result is another bio chain of |
| 1332 | * exactly the given length, or a null pointer on error. |
| 1333 | * |
| 1334 | * The bio_src and offset parameters are both in-out. On entry they |
| 1335 | * refer to the first source bio and the offset into that bio where |
| 1336 | * the start of data to be cloned is located. |
| 1337 | * |
| 1338 | * On return, bio_src is updated to refer to the bio in the source |
| 1339 | * chain that contains first un-cloned byte, and *offset will |
| 1340 | * contain the offset of that byte within that bio. |
| 1341 | */ |
| 1342 | static struct bio *bio_chain_clone_range(struct bio **bio_src, |
| 1343 | unsigned int *offset, |
| 1344 | unsigned int len, |
| 1345 | gfp_t gfpmask) |
| 1346 | { |
| 1347 | struct bio *bi = *bio_src; |
| 1348 | unsigned int off = *offset; |
| 1349 | struct bio *chain = NULL; |
| 1350 | struct bio **end; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1351 | |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1352 | /* Build up a chain of clone bios up to the limit */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1353 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1354 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1355 | return NULL; /* Nothing to clone */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1356 | |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1357 | end = &chain; |
| 1358 | while (len) { |
| 1359 | unsigned int bi_size; |
| 1360 | struct bio *bio; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1361 | |
Alex Elder | f5400b7 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 1362 | if (!bi) { |
| 1363 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1364 | goto out_err; /* EINVAL; ran out of bio's */ |
Alex Elder | f5400b7 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 1365 | } |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1366 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1367 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
| 1368 | if (!bio) |
| 1369 | goto out_err; /* ENOMEM */ |
| 1370 | |
| 1371 | *end = bio; |
| 1372 | end = &bio->bi_next; |
| 1373 | |
| 1374 | off += bi_size; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1375 | if (off == bi->bi_iter.bi_size) { |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1376 | bi = bi->bi_next; |
| 1377 | off = 0; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1378 | } |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1379 | len -= bi_size; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1380 | } |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1381 | *bio_src = bi; |
| 1382 | *offset = off; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1383 | |
Alex Elder | f7760da | 2012-10-20 22:17:27 -0500 | [diff] [blame] | 1384 | return chain; |
| 1385 | out_err: |
| 1386 | bio_chain_put(chain); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1387 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1388 | return NULL; |
| 1389 | } |
| 1390 | |
Alex Elder | 926f9b3 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1391 | /* |
| 1392 | * The default/initial value for all object request flags is 0. For |
| 1393 | * each flag, once its value is set to 1 it is never reset to 0 |
| 1394 | * again. |
| 1395 | */ |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1396 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
| 1397 | { |
| 1398 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1399 | struct rbd_device *rbd_dev; |
| 1400 | |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1401 | rbd_dev = obj_request->img_request->rbd_dev; |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 1402 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1403 | obj_request); |
| 1404 | } |
| 1405 | } |
| 1406 | |
| 1407 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
| 1408 | { |
| 1409 | smp_mb(); |
| 1410 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
| 1411 | } |
| 1412 | |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1413 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
| 1414 | { |
| 1415 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
| 1416 | struct rbd_device *rbd_dev = NULL; |
| 1417 | |
| 1418 | if (obj_request_img_data_test(obj_request)) |
| 1419 | rbd_dev = obj_request->img_request->rbd_dev; |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 1420 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1421 | obj_request); |
| 1422 | } |
| 1423 | } |
| 1424 | |
| 1425 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
| 1426 | { |
| 1427 | smp_mb(); |
| 1428 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
| 1429 | } |
| 1430 | |
Alex Elder | 5679c59 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1431 | /* |
| 1432 | * This sets the KNOWN flag after (possibly) setting the EXISTS |
| 1433 | * flag. The latter is set based on the "exists" value provided. |
| 1434 | * |
| 1435 | * Note that for our purposes once an object exists it never goes |
| 1436 | * away again. It's possible that the response from two existence |
| 1437 | * checks are separated by the creation of the target object, and |
| 1438 | * the first ("doesn't exist") response arrives *after* the second |
| 1439 | * ("does exist"). In that case we ignore the second one. |
| 1440 | */ |
| 1441 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, |
| 1442 | bool exists) |
| 1443 | { |
| 1444 | if (exists) |
| 1445 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); |
| 1446 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); |
| 1447 | smp_mb(); |
| 1448 | } |
| 1449 | |
| 1450 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) |
| 1451 | { |
| 1452 | smp_mb(); |
| 1453 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; |
| 1454 | } |
| 1455 | |
| 1456 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) |
| 1457 | { |
| 1458 | smp_mb(); |
| 1459 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; |
| 1460 | } |
| 1461 | |
Ilya Dryomov | 9638556 | 2014-06-10 13:53:29 +0400 | [diff] [blame] | 1462 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
| 1463 | { |
| 1464 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
| 1465 | |
| 1466 | return obj_request->img_offset < |
| 1467 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); |
| 1468 | } |
| 1469 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1470 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
| 1471 | { |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1472 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
| 1473 | atomic_read(&obj_request->kref.refcount)); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1474 | kref_get(&obj_request->kref); |
| 1475 | } |
| 1476 | |
| 1477 | static void rbd_obj_request_destroy(struct kref *kref); |
| 1478 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) |
| 1479 | { |
| 1480 | rbd_assert(obj_request != NULL); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1481 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
| 1482 | atomic_read(&obj_request->kref.refcount)); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1483 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
| 1484 | } |
| 1485 | |
Alex Elder | 0f2d5be | 2014-04-26 14:21:44 +0400 | [diff] [blame] | 1486 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
| 1487 | { |
| 1488 | dout("%s: img %p (was %d)\n", __func__, img_request, |
| 1489 | atomic_read(&img_request->kref.refcount)); |
| 1490 | kref_get(&img_request->kref); |
| 1491 | } |
| 1492 | |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 1493 | static bool img_request_child_test(struct rbd_img_request *img_request); |
| 1494 | static void rbd_parent_request_destroy(struct kref *kref); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1495 | static void rbd_img_request_destroy(struct kref *kref); |
| 1496 | static void rbd_img_request_put(struct rbd_img_request *img_request) |
| 1497 | { |
| 1498 | rbd_assert(img_request != NULL); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1499 | dout("%s: img %p (was %d)\n", __func__, img_request, |
| 1500 | atomic_read(&img_request->kref.refcount)); |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 1501 | if (img_request_child_test(img_request)) |
| 1502 | kref_put(&img_request->kref, rbd_parent_request_destroy); |
| 1503 | else |
| 1504 | kref_put(&img_request->kref, rbd_img_request_destroy); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1505 | } |
| 1506 | |
| 1507 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
| 1508 | struct rbd_obj_request *obj_request) |
| 1509 | { |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1510 | rbd_assert(obj_request->img_request == NULL); |
| 1511 | |
Alex Elder | b155e86 | 2013-04-15 14:50:37 -0500 | [diff] [blame] | 1512 | /* Image request now owns object's original reference */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1513 | obj_request->img_request = img_request; |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1514 | obj_request->which = img_request->obj_request_count; |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1515 | rbd_assert(!obj_request_img_data_test(obj_request)); |
| 1516 | obj_request_img_data_set(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1517 | rbd_assert(obj_request->which != BAD_WHICH); |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1518 | img_request->obj_request_count++; |
| 1519 | list_add_tail(&obj_request->links, &img_request->obj_requests); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1520 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
| 1521 | obj_request->which); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1522 | } |
| 1523 | |
| 1524 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, |
| 1525 | struct rbd_obj_request *obj_request) |
| 1526 | { |
| 1527 | rbd_assert(obj_request->which != BAD_WHICH); |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1528 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1529 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
| 1530 | obj_request->which); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1531 | list_del(&obj_request->links); |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1532 | rbd_assert(img_request->obj_request_count > 0); |
| 1533 | img_request->obj_request_count--; |
| 1534 | rbd_assert(obj_request->which == img_request->obj_request_count); |
| 1535 | obj_request->which = BAD_WHICH; |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1536 | rbd_assert(obj_request_img_data_test(obj_request)); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1537 | rbd_assert(obj_request->img_request == img_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1538 | obj_request->img_request = NULL; |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 1539 | obj_request->callback = NULL; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1540 | rbd_obj_request_put(obj_request); |
| 1541 | } |
| 1542 | |
| 1543 | static bool obj_request_type_valid(enum obj_request_type type) |
| 1544 | { |
| 1545 | switch (type) { |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 1546 | case OBJ_REQUEST_NODATA: |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1547 | case OBJ_REQUEST_BIO: |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 1548 | case OBJ_REQUEST_PAGES: |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1549 | return true; |
| 1550 | default: |
| 1551 | return false; |
| 1552 | } |
| 1553 | } |
| 1554 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1555 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
| 1556 | struct rbd_obj_request *obj_request) |
| 1557 | { |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1558 | dout("%s %p\n", __func__, obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1559 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
| 1560 | } |
| 1561 | |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1562 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
| 1563 | { |
| 1564 | dout("%s %p\n", __func__, obj_request); |
| 1565 | ceph_osdc_cancel_request(obj_request->osd_req); |
| 1566 | } |
| 1567 | |
| 1568 | /* |
| 1569 | * Wait for an object request to complete. If interrupted, cancel the |
| 1570 | * underlying osd request. |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1571 | * |
| 1572 | * @timeout: in jiffies, 0 means "wait forever" |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1573 | */ |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1574 | static int __rbd_obj_request_wait(struct rbd_obj_request *obj_request, |
| 1575 | unsigned long timeout) |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1576 | { |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1577 | long ret; |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1578 | |
| 1579 | dout("%s %p\n", __func__, obj_request); |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1580 | ret = wait_for_completion_interruptible_timeout( |
| 1581 | &obj_request->completion, |
| 1582 | ceph_timeout_jiffies(timeout)); |
| 1583 | if (ret <= 0) { |
| 1584 | if (ret == 0) |
| 1585 | ret = -ETIMEDOUT; |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1586 | rbd_obj_request_end(obj_request); |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1587 | } else { |
| 1588 | ret = 0; |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1589 | } |
| 1590 | |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 1591 | dout("%s %p ret %d\n", __func__, obj_request, (int)ret); |
| 1592 | return ret; |
| 1593 | } |
| 1594 | |
| 1595 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) |
| 1596 | { |
| 1597 | return __rbd_obj_request_wait(obj_request, 0); |
| 1598 | } |
| 1599 | |
| 1600 | static int rbd_obj_request_wait_timeout(struct rbd_obj_request *obj_request, |
| 1601 | unsigned long timeout) |
| 1602 | { |
| 1603 | return __rbd_obj_request_wait(obj_request, timeout); |
Ilya Dryomov | 71c20a0 | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 1604 | } |
| 1605 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1606 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
| 1607 | { |
Alex Elder | 55f27e0 | 2013-04-10 12:34:25 -0500 | [diff] [blame] | 1608 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1609 | dout("%s: img %p\n", __func__, img_request); |
Alex Elder | 55f27e0 | 2013-04-10 12:34:25 -0500 | [diff] [blame] | 1610 | |
| 1611 | /* |
| 1612 | * If no error occurred, compute the aggregate transfer |
| 1613 | * count for the image request. We could instead use |
| 1614 | * atomic64_cmpxchg() to update it as each object request |
| 1615 | * completes; not clear which way is better off hand. |
| 1616 | */ |
| 1617 | if (!img_request->result) { |
| 1618 | struct rbd_obj_request *obj_request; |
| 1619 | u64 xferred = 0; |
| 1620 | |
| 1621 | for_each_obj_request(img_request, obj_request) |
| 1622 | xferred += obj_request->xferred; |
| 1623 | img_request->xferred = xferred; |
| 1624 | } |
| 1625 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1626 | if (img_request->callback) |
| 1627 | img_request->callback(img_request); |
| 1628 | else |
| 1629 | rbd_img_request_put(img_request); |
| 1630 | } |
| 1631 | |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 1632 | /* |
| 1633 | * The default/initial value for all image request flags is 0. Each |
| 1634 | * is conditionally set to 1 at image request initialization time |
| 1635 | * and currently never change thereafter. |
| 1636 | */ |
| 1637 | static void img_request_write_set(struct rbd_img_request *img_request) |
| 1638 | { |
| 1639 | set_bit(IMG_REQ_WRITE, &img_request->flags); |
| 1640 | smp_mb(); |
| 1641 | } |
| 1642 | |
| 1643 | static bool img_request_write_test(struct rbd_img_request *img_request) |
| 1644 | { |
| 1645 | smp_mb(); |
| 1646 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; |
| 1647 | } |
| 1648 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1649 | /* |
| 1650 | * Set the discard flag when the img_request is an discard request |
| 1651 | */ |
| 1652 | static void img_request_discard_set(struct rbd_img_request *img_request) |
| 1653 | { |
| 1654 | set_bit(IMG_REQ_DISCARD, &img_request->flags); |
| 1655 | smp_mb(); |
| 1656 | } |
| 1657 | |
| 1658 | static bool img_request_discard_test(struct rbd_img_request *img_request) |
| 1659 | { |
| 1660 | smp_mb(); |
| 1661 | return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; |
| 1662 | } |
| 1663 | |
Alex Elder | 9849e98 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1664 | static void img_request_child_set(struct rbd_img_request *img_request) |
| 1665 | { |
| 1666 | set_bit(IMG_REQ_CHILD, &img_request->flags); |
| 1667 | smp_mb(); |
| 1668 | } |
| 1669 | |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 1670 | static void img_request_child_clear(struct rbd_img_request *img_request) |
| 1671 | { |
| 1672 | clear_bit(IMG_REQ_CHILD, &img_request->flags); |
| 1673 | smp_mb(); |
| 1674 | } |
| 1675 | |
Alex Elder | 9849e98 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1676 | static bool img_request_child_test(struct rbd_img_request *img_request) |
| 1677 | { |
| 1678 | smp_mb(); |
| 1679 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; |
| 1680 | } |
| 1681 | |
Alex Elder | d0b2e94 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1682 | static void img_request_layered_set(struct rbd_img_request *img_request) |
| 1683 | { |
| 1684 | set_bit(IMG_REQ_LAYERED, &img_request->flags); |
| 1685 | smp_mb(); |
| 1686 | } |
| 1687 | |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 1688 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
| 1689 | { |
| 1690 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); |
| 1691 | smp_mb(); |
| 1692 | } |
| 1693 | |
Alex Elder | d0b2e94 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1694 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
| 1695 | { |
| 1696 | smp_mb(); |
| 1697 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; |
| 1698 | } |
| 1699 | |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 1700 | static enum obj_operation_type |
| 1701 | rbd_img_request_op_type(struct rbd_img_request *img_request) |
| 1702 | { |
| 1703 | if (img_request_write_test(img_request)) |
| 1704 | return OBJ_OP_WRITE; |
| 1705 | else if (img_request_discard_test(img_request)) |
| 1706 | return OBJ_OP_DISCARD; |
| 1707 | else |
| 1708 | return OBJ_OP_READ; |
| 1709 | } |
| 1710 | |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1711 | static void |
| 1712 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) |
| 1713 | { |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1714 | u64 xferred = obj_request->xferred; |
| 1715 | u64 length = obj_request->length; |
| 1716 | |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1717 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
| 1718 | obj_request, obj_request->img_request, obj_request->result, |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1719 | xferred, length); |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1720 | /* |
Josh Durgin | 17c1cc1 | 2013-08-26 17:55:38 -0700 | [diff] [blame] | 1721 | * ENOENT means a hole in the image. We zero-fill the entire |
| 1722 | * length of the request. A short read also implies zero-fill |
| 1723 | * to the end of the request. An error requires the whole |
| 1724 | * length of the request to be reported finished with an error |
| 1725 | * to the block layer. In each case we update the xferred |
| 1726 | * count to indicate the whole request was satisfied. |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1727 | */ |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1728 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1729 | if (obj_request->result == -ENOENT) { |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1730 | if (obj_request->type == OBJ_REQUEST_BIO) |
| 1731 | zero_bio_chain(obj_request->bio_list, 0); |
| 1732 | else |
| 1733 | zero_pages(obj_request->pages, 0, length); |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1734 | obj_request->result = 0; |
Alex Elder | b9434c5 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1735 | } else if (xferred < length && !obj_request->result) { |
| 1736 | if (obj_request->type == OBJ_REQUEST_BIO) |
| 1737 | zero_bio_chain(obj_request->bio_list, xferred); |
| 1738 | else |
| 1739 | zero_pages(obj_request->pages, xferred, length); |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1740 | } |
Josh Durgin | 17c1cc1 | 2013-08-26 17:55:38 -0700 | [diff] [blame] | 1741 | obj_request->xferred = length; |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1742 | obj_request_done_set(obj_request); |
| 1743 | } |
| 1744 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1745 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
| 1746 | { |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1747 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
| 1748 | obj_request->callback); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1749 | if (obj_request->callback) |
| 1750 | obj_request->callback(obj_request); |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 1751 | else |
| 1752 | complete_all(&obj_request->completion); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1753 | } |
| 1754 | |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1755 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
Alex Elder | 39bf2c5 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1756 | { |
| 1757 | dout("%s: obj %p\n", __func__, obj_request); |
| 1758 | obj_request_done_set(obj_request); |
| 1759 | } |
| 1760 | |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1761 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1762 | { |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1763 | struct rbd_img_request *img_request = NULL; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 1764 | struct rbd_device *rbd_dev = NULL; |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1765 | bool layered = false; |
| 1766 | |
| 1767 | if (obj_request_img_data_test(obj_request)) { |
| 1768 | img_request = obj_request->img_request; |
| 1769 | layered = img_request && img_request_layered_test(img_request); |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 1770 | rbd_dev = img_request->rbd_dev; |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1771 | } |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1772 | |
| 1773 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
| 1774 | obj_request, img_request, obj_request->result, |
| 1775 | obj_request->xferred, obj_request->length); |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 1776 | if (layered && obj_request->result == -ENOENT && |
| 1777 | obj_request->img_offset < rbd_dev->parent_overlap) |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1778 | rbd_img_parent_read(obj_request); |
| 1779 | else if (img_request) |
Alex Elder | 6e2a450 | 2013-03-27 09:16:30 -0500 | [diff] [blame] | 1780 | rbd_img_obj_request_read_callback(obj_request); |
| 1781 | else |
| 1782 | obj_request_done_set(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1783 | } |
| 1784 | |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1785 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1786 | { |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 1787 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
| 1788 | obj_request->result, obj_request->length); |
| 1789 | /* |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1790 | * There is no such thing as a successful short write. Set |
| 1791 | * it to our originally-requested length. |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 1792 | */ |
| 1793 | obj_request->xferred = obj_request->length; |
Alex Elder | 0774130 | 2013-02-05 23:41:50 -0600 | [diff] [blame] | 1794 | obj_request_done_set(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1795 | } |
| 1796 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1797 | static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
| 1798 | { |
| 1799 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
| 1800 | obj_request->result, obj_request->length); |
| 1801 | /* |
| 1802 | * There is no such thing as a successful short discard. Set |
| 1803 | * it to our originally-requested length. |
| 1804 | */ |
| 1805 | obj_request->xferred = obj_request->length; |
Josh Durgin | d0265de | 2014-04-07 16:54:10 -0700 | [diff] [blame] | 1806 | /* discarding a non-existent object is not a problem */ |
| 1807 | if (obj_request->result == -ENOENT) |
| 1808 | obj_request->result = 0; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1809 | obj_request_done_set(obj_request); |
| 1810 | } |
| 1811 | |
Alex Elder | fbfab53 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 1812 | /* |
| 1813 | * For a simple stat call there's nothing to do. We'll do more if |
| 1814 | * this is part of a write sequence for a layered image. |
| 1815 | */ |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1816 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
Alex Elder | fbfab53 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 1817 | { |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1818 | dout("%s: obj %p\n", __func__, obj_request); |
Alex Elder | fbfab53 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 1819 | obj_request_done_set(obj_request); |
| 1820 | } |
| 1821 | |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 1822 | static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) |
| 1823 | { |
| 1824 | dout("%s: obj %p\n", __func__, obj_request); |
| 1825 | |
| 1826 | if (obj_request_img_data_test(obj_request)) |
| 1827 | rbd_osd_copyup_callback(obj_request); |
| 1828 | else |
| 1829 | obj_request_done_set(obj_request); |
| 1830 | } |
| 1831 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1832 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
| 1833 | struct ceph_msg *msg) |
| 1834 | { |
| 1835 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1836 | u16 opcode; |
| 1837 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 1838 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1839 | rbd_assert(osd_req == obj_request->osd_req); |
Alex Elder | 57acbaa | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1840 | if (obj_request_img_data_test(obj_request)) { |
| 1841 | rbd_assert(obj_request->img_request); |
| 1842 | rbd_assert(obj_request->which != BAD_WHICH); |
| 1843 | } else { |
| 1844 | rbd_assert(obj_request->which == BAD_WHICH); |
| 1845 | } |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1846 | |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 1847 | if (osd_req->r_result < 0) |
| 1848 | obj_request->result = osd_req->r_result; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1849 | |
Ilya Dryomov | 7cc69d4 | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 1850 | rbd_assert(osd_req->r_num_ops <= CEPH_OSD_MAX_OP); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1851 | |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1852 | /* |
| 1853 | * We support a 64-bit length, but ultimately it has to be |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 1854 | * passed to the block layer, which just supports a 32-bit |
| 1855 | * length field. |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1856 | */ |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 1857 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 1858 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 1859 | |
Alex Elder | 7952873 | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1860 | opcode = osd_req->r_ops[0].op; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1861 | switch (opcode) { |
| 1862 | case CEPH_OSD_OP_READ: |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1863 | rbd_osd_read_callback(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1864 | break; |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 1865 | case CEPH_OSD_OP_SETALLOCHINT: |
Ilya Dryomov | e30b757 | 2015-10-07 17:27:17 +0200 | [diff] [blame] | 1866 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE || |
| 1867 | osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL); |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 1868 | /* fall through */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1869 | case CEPH_OSD_OP_WRITE: |
Ilya Dryomov | e30b757 | 2015-10-07 17:27:17 +0200 | [diff] [blame] | 1870 | case CEPH_OSD_OP_WRITEFULL: |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1871 | rbd_osd_write_callback(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1872 | break; |
Alex Elder | fbfab53 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 1873 | case CEPH_OSD_OP_STAT: |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1874 | rbd_osd_stat_callback(obj_request); |
Alex Elder | fbfab53 | 2013-02-08 09:55:48 -0600 | [diff] [blame] | 1875 | break; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1876 | case CEPH_OSD_OP_DELETE: |
| 1877 | case CEPH_OSD_OP_TRUNCATE: |
| 1878 | case CEPH_OSD_OP_ZERO: |
| 1879 | rbd_osd_discard_callback(obj_request); |
| 1880 | break; |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 1881 | case CEPH_OSD_OP_CALL: |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 1882 | rbd_osd_call_callback(obj_request); |
| 1883 | break; |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 1884 | case CEPH_OSD_OP_NOTIFY_ACK: |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 1885 | case CEPH_OSD_OP_WATCH: |
Alex Elder | c47f937 | 2013-02-26 14:23:07 -0600 | [diff] [blame] | 1886 | rbd_osd_trivial_callback(obj_request); |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 1887 | break; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1888 | default: |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 1889 | rbd_warn(NULL, "%s: unsupported op %hu", |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1890 | obj_request->object_name, (unsigned short) opcode); |
| 1891 | break; |
| 1892 | } |
| 1893 | |
Alex Elder | 0774130 | 2013-02-05 23:41:50 -0600 | [diff] [blame] | 1894 | if (obj_request_done_test(obj_request)) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1895 | rbd_obj_request_complete(obj_request); |
| 1896 | } |
| 1897 | |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1898 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1899 | { |
| 1900 | struct rbd_img_request *img_request = obj_request->img_request; |
Alex Elder | 8c042b0 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 1901 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1902 | u64 snap_id; |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1903 | |
Alex Elder | 8c042b0 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 1904 | rbd_assert(osd_req != NULL); |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1905 | |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1906 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
Alex Elder | 8c042b0 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 1907 | ceph_osdc_build_request(osd_req, obj_request->offset, |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1908 | NULL, snap_id, NULL); |
| 1909 | } |
| 1910 | |
| 1911 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) |
| 1912 | { |
| 1913 | struct rbd_img_request *img_request = obj_request->img_request; |
| 1914 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
| 1915 | struct ceph_snap_context *snapc; |
| 1916 | struct timespec mtime = CURRENT_TIME; |
| 1917 | |
| 1918 | rbd_assert(osd_req != NULL); |
| 1919 | |
| 1920 | snapc = img_request ? img_request->snapc : NULL; |
| 1921 | ceph_osdc_build_request(osd_req, obj_request->offset, |
| 1922 | snapc, CEPH_NOSNAP, &mtime); |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1923 | } |
| 1924 | |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 1925 | /* |
| 1926 | * Create an osd request. A read request has one osd op (read). |
| 1927 | * A write request has either one (watch) or two (hint+write) osd ops. |
| 1928 | * (All rbd data writes are prefixed with an allocation hint op, but |
| 1929 | * technically osd watch is a write request, hence this distinction.) |
| 1930 | */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1931 | static struct ceph_osd_request *rbd_osd_req_create( |
| 1932 | struct rbd_device *rbd_dev, |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 1933 | enum obj_operation_type op_type, |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 1934 | unsigned int num_ops, |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1935 | struct rbd_obj_request *obj_request) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1936 | { |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1937 | struct ceph_snap_context *snapc = NULL; |
| 1938 | struct ceph_osd_client *osdc; |
| 1939 | struct ceph_osd_request *osd_req; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1940 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1941 | if (obj_request_img_data_test(obj_request) && |
| 1942 | (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 1943 | struct rbd_img_request *img_request = obj_request->img_request; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1944 | if (op_type == OBJ_OP_WRITE) { |
| 1945 | rbd_assert(img_request_write_test(img_request)); |
| 1946 | } else { |
| 1947 | rbd_assert(img_request_discard_test(img_request)); |
| 1948 | } |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 1949 | snapc = img_request->snapc; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1950 | } |
| 1951 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 1952 | rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 1953 | |
| 1954 | /* Allocate and initialize the request, for the num_ops ops */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1955 | |
| 1956 | osdc = &rbd_dev->rbd_client->client->osdc; |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 1957 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
| 1958 | GFP_ATOMIC); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1959 | if (!osd_req) |
| 1960 | return NULL; /* ENOMEM */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1961 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 1962 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1963 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 1964 | else |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1965 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1966 | |
| 1967 | osd_req->r_callback = rbd_osd_req_callback; |
| 1968 | osd_req->r_priv = obj_request; |
| 1969 | |
Ilya Dryomov | 3c972c9 | 2014-01-27 17:40:20 +0200 | [diff] [blame] | 1970 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
| 1971 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1972 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 1973 | return osd_req; |
| 1974 | } |
| 1975 | |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1976 | /* |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 1977 | * Create a copyup osd request based on the information in the object |
| 1978 | * request supplied. A copyup request has two or three osd ops, a |
| 1979 | * copyup method call, potentially a hint op, and a write or truncate |
| 1980 | * or zero op. |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1981 | */ |
| 1982 | static struct ceph_osd_request * |
| 1983 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) |
| 1984 | { |
| 1985 | struct rbd_img_request *img_request; |
| 1986 | struct ceph_snap_context *snapc; |
| 1987 | struct rbd_device *rbd_dev; |
| 1988 | struct ceph_osd_client *osdc; |
| 1989 | struct ceph_osd_request *osd_req; |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 1990 | int num_osd_ops = 3; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1991 | |
| 1992 | rbd_assert(obj_request_img_data_test(obj_request)); |
| 1993 | img_request = obj_request->img_request; |
| 1994 | rbd_assert(img_request); |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 1995 | rbd_assert(img_request_write_test(img_request) || |
| 1996 | img_request_discard_test(img_request)); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 1997 | |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 1998 | if (img_request_discard_test(img_request)) |
| 1999 | num_osd_ops = 2; |
| 2000 | |
| 2001 | /* Allocate and initialize the request, for all the ops */ |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2002 | |
| 2003 | snapc = img_request->snapc; |
| 2004 | rbd_dev = img_request->rbd_dev; |
| 2005 | osdc = &rbd_dev->rbd_client->client->osdc; |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2006 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops, |
| 2007 | false, GFP_ATOMIC); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2008 | if (!osd_req) |
| 2009 | return NULL; /* ENOMEM */ |
| 2010 | |
| 2011 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
| 2012 | osd_req->r_callback = rbd_osd_req_callback; |
| 2013 | osd_req->r_priv = obj_request; |
| 2014 | |
Ilya Dryomov | 3c972c9 | 2014-01-27 17:40:20 +0200 | [diff] [blame] | 2015 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
| 2016 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2017 | |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2018 | return osd_req; |
| 2019 | } |
| 2020 | |
| 2021 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2022 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
| 2023 | { |
| 2024 | ceph_osdc_put_request(osd_req); |
| 2025 | } |
| 2026 | |
| 2027 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ |
| 2028 | |
| 2029 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, |
| 2030 | u64 offset, u64 length, |
| 2031 | enum obj_request_type type) |
| 2032 | { |
| 2033 | struct rbd_obj_request *obj_request; |
| 2034 | size_t size; |
| 2035 | char *name; |
| 2036 | |
| 2037 | rbd_assert(obj_request_type_valid(type)); |
| 2038 | |
| 2039 | size = strlen(object_name) + 1; |
Ilya Dryomov | 5a60e87 | 2015-06-24 17:24:33 +0300 | [diff] [blame] | 2040 | name = kmalloc(size, GFP_NOIO); |
Alex Elder | f907ad5 | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 2041 | if (!name) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2042 | return NULL; |
| 2043 | |
Ilya Dryomov | 5a60e87 | 2015-06-24 17:24:33 +0300 | [diff] [blame] | 2044 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
Alex Elder | f907ad5 | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 2045 | if (!obj_request) { |
| 2046 | kfree(name); |
| 2047 | return NULL; |
| 2048 | } |
| 2049 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2050 | obj_request->object_name = memcpy(name, object_name, size); |
| 2051 | obj_request->offset = offset; |
| 2052 | obj_request->length = length; |
Alex Elder | 926f9b3 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2053 | obj_request->flags = 0; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2054 | obj_request->which = BAD_WHICH; |
| 2055 | obj_request->type = type; |
| 2056 | INIT_LIST_HEAD(&obj_request->links); |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 2057 | init_completion(&obj_request->completion); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2058 | kref_init(&obj_request->kref); |
| 2059 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2060 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
| 2061 | offset, length, (int)type, obj_request); |
| 2062 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2063 | return obj_request; |
| 2064 | } |
| 2065 | |
| 2066 | static void rbd_obj_request_destroy(struct kref *kref) |
| 2067 | { |
| 2068 | struct rbd_obj_request *obj_request; |
| 2069 | |
| 2070 | obj_request = container_of(kref, struct rbd_obj_request, kref); |
| 2071 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2072 | dout("%s: obj %p\n", __func__, obj_request); |
| 2073 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2074 | rbd_assert(obj_request->img_request == NULL); |
| 2075 | rbd_assert(obj_request->which == BAD_WHICH); |
| 2076 | |
| 2077 | if (obj_request->osd_req) |
| 2078 | rbd_osd_req_destroy(obj_request->osd_req); |
| 2079 | |
| 2080 | rbd_assert(obj_request_type_valid(obj_request->type)); |
| 2081 | switch (obj_request->type) { |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 2082 | case OBJ_REQUEST_NODATA: |
| 2083 | break; /* Nothing to do */ |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2084 | case OBJ_REQUEST_BIO: |
| 2085 | if (obj_request->bio_list) |
| 2086 | bio_chain_put(obj_request->bio_list); |
| 2087 | break; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 2088 | case OBJ_REQUEST_PAGES: |
| 2089 | if (obj_request->pages) |
| 2090 | ceph_release_page_vector(obj_request->pages, |
| 2091 | obj_request->page_count); |
| 2092 | break; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2093 | } |
| 2094 | |
Alex Elder | f907ad5 | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 2095 | kfree(obj_request->object_name); |
Alex Elder | 868311b | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 2096 | obj_request->object_name = NULL; |
| 2097 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2098 | } |
| 2099 | |
Alex Elder | fb65d228 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2100 | /* It's OK to call this for a device with no parent */ |
| 2101 | |
| 2102 | static void rbd_spec_put(struct rbd_spec *spec); |
| 2103 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) |
| 2104 | { |
| 2105 | rbd_dev_remove_parent(rbd_dev); |
| 2106 | rbd_spec_put(rbd_dev->parent_spec); |
| 2107 | rbd_dev->parent_spec = NULL; |
| 2108 | rbd_dev->parent_overlap = 0; |
| 2109 | } |
| 2110 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2111 | /* |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2112 | * Parent image reference counting is used to determine when an |
| 2113 | * image's parent fields can be safely torn down--after there are no |
| 2114 | * more in-flight requests to the parent image. When the last |
| 2115 | * reference is dropped, cleaning them up is safe. |
| 2116 | */ |
| 2117 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) |
| 2118 | { |
| 2119 | int counter; |
| 2120 | |
| 2121 | if (!rbd_dev->parent_spec) |
| 2122 | return; |
| 2123 | |
| 2124 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); |
| 2125 | if (counter > 0) |
| 2126 | return; |
| 2127 | |
| 2128 | /* Last reference; clean up parent data structures */ |
| 2129 | |
| 2130 | if (!counter) |
| 2131 | rbd_dev_unparent(rbd_dev); |
| 2132 | else |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 2133 | rbd_warn(rbd_dev, "parent reference underflow"); |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2134 | } |
| 2135 | |
| 2136 | /* |
| 2137 | * If an image has a non-zero parent overlap, get a reference to its |
| 2138 | * parent. |
| 2139 | * |
| 2140 | * Returns true if the rbd device has a parent with a non-zero |
| 2141 | * overlap and a reference for it was successfully taken, or |
| 2142 | * false otherwise. |
| 2143 | */ |
| 2144 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) |
| 2145 | { |
Ilya Dryomov | ae43e9d | 2015-01-19 18:13:43 +0300 | [diff] [blame] | 2146 | int counter = 0; |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2147 | |
| 2148 | if (!rbd_dev->parent_spec) |
| 2149 | return false; |
| 2150 | |
Ilya Dryomov | ae43e9d | 2015-01-19 18:13:43 +0300 | [diff] [blame] | 2151 | down_read(&rbd_dev->header_rwsem); |
| 2152 | if (rbd_dev->parent_overlap) |
| 2153 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); |
| 2154 | up_read(&rbd_dev->header_rwsem); |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2155 | |
| 2156 | if (counter < 0) |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 2157 | rbd_warn(rbd_dev, "parent reference overflow"); |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2158 | |
Ilya Dryomov | ae43e9d | 2015-01-19 18:13:43 +0300 | [diff] [blame] | 2159 | return counter > 0; |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2160 | } |
| 2161 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2162 | /* |
| 2163 | * Caller is responsible for filling in the list of object requests |
| 2164 | * that comprises the image request, and the Linux request pointer |
| 2165 | * (if there is one). |
| 2166 | */ |
Alex Elder | cc344fa | 2013-02-19 12:25:56 -0600 | [diff] [blame] | 2167 | static struct rbd_img_request *rbd_img_request_create( |
| 2168 | struct rbd_device *rbd_dev, |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2169 | u64 offset, u64 length, |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2170 | enum obj_operation_type op_type, |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 2171 | struct ceph_snap_context *snapc) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2172 | { |
| 2173 | struct rbd_img_request *img_request; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2174 | |
Ilya Dryomov | 7a716aa | 2014-08-05 11:25:54 +0400 | [diff] [blame] | 2175 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2176 | if (!img_request) |
| 2177 | return NULL; |
| 2178 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2179 | img_request->rq = NULL; |
| 2180 | img_request->rbd_dev = rbd_dev; |
| 2181 | img_request->offset = offset; |
| 2182 | img_request->length = length; |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2183 | img_request->flags = 0; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 2184 | if (op_type == OBJ_OP_DISCARD) { |
| 2185 | img_request_discard_set(img_request); |
| 2186 | img_request->snapc = snapc; |
| 2187 | } else if (op_type == OBJ_OP_WRITE) { |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2188 | img_request_write_set(img_request); |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 2189 | img_request->snapc = snapc; |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2190 | } else { |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2191 | img_request->snap_id = rbd_dev->spec->snap_id; |
Alex Elder | 0c42524 | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2192 | } |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2193 | if (rbd_dev_parent_get(rbd_dev)) |
Alex Elder | d0b2e94 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2194 | img_request_layered_set(img_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2195 | spin_lock_init(&img_request->completion_lock); |
| 2196 | img_request->next_completion = 0; |
| 2197 | img_request->callback = NULL; |
Alex Elder | a5a337d | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2198 | img_request->result = 0; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2199 | img_request->obj_request_count = 0; |
| 2200 | INIT_LIST_HEAD(&img_request->obj_requests); |
| 2201 | kref_init(&img_request->kref); |
| 2202 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2203 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2204 | obj_op_name(op_type), offset, length, img_request); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2205 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2206 | return img_request; |
| 2207 | } |
| 2208 | |
| 2209 | static void rbd_img_request_destroy(struct kref *kref) |
| 2210 | { |
| 2211 | struct rbd_img_request *img_request; |
| 2212 | struct rbd_obj_request *obj_request; |
| 2213 | struct rbd_obj_request *next_obj_request; |
| 2214 | |
| 2215 | img_request = container_of(kref, struct rbd_img_request, kref); |
| 2216 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2217 | dout("%s: img %p\n", __func__, img_request); |
| 2218 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2219 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
| 2220 | rbd_img_obj_request_del(img_request, obj_request); |
Alex Elder | 25dcf95 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 2221 | rbd_assert(img_request->obj_request_count == 0); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2222 | |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2223 | if (img_request_layered_test(img_request)) { |
| 2224 | img_request_layered_clear(img_request); |
| 2225 | rbd_dev_parent_put(img_request->rbd_dev); |
| 2226 | } |
| 2227 | |
Josh Durgin | bef9545 | 2014-04-04 17:47:52 -0700 | [diff] [blame] | 2228 | if (img_request_write_test(img_request) || |
| 2229 | img_request_discard_test(img_request)) |
Alex Elder | 812164f8 | 2013-04-30 00:44:32 -0500 | [diff] [blame] | 2230 | ceph_put_snap_context(img_request->snapc); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2231 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 2232 | kmem_cache_free(rbd_img_request_cache, img_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2233 | } |
| 2234 | |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2235 | static struct rbd_img_request *rbd_parent_request_create( |
| 2236 | struct rbd_obj_request *obj_request, |
| 2237 | u64 img_offset, u64 length) |
| 2238 | { |
| 2239 | struct rbd_img_request *parent_request; |
| 2240 | struct rbd_device *rbd_dev; |
| 2241 | |
| 2242 | rbd_assert(obj_request->img_request); |
| 2243 | rbd_dev = obj_request->img_request->rbd_dev; |
| 2244 | |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 2245 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2246 | length, OBJ_OP_READ, NULL); |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2247 | if (!parent_request) |
| 2248 | return NULL; |
| 2249 | |
| 2250 | img_request_child_set(parent_request); |
| 2251 | rbd_obj_request_get(obj_request); |
| 2252 | parent_request->obj_request = obj_request; |
| 2253 | |
| 2254 | return parent_request; |
| 2255 | } |
| 2256 | |
| 2257 | static void rbd_parent_request_destroy(struct kref *kref) |
| 2258 | { |
| 2259 | struct rbd_img_request *parent_request; |
| 2260 | struct rbd_obj_request *orig_request; |
| 2261 | |
| 2262 | parent_request = container_of(kref, struct rbd_img_request, kref); |
| 2263 | orig_request = parent_request->obj_request; |
| 2264 | |
| 2265 | parent_request->obj_request = NULL; |
| 2266 | rbd_obj_request_put(orig_request); |
| 2267 | img_request_child_clear(parent_request); |
| 2268 | |
| 2269 | rbd_img_request_destroy(kref); |
| 2270 | } |
| 2271 | |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2272 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
| 2273 | { |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2274 | struct rbd_img_request *img_request; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2275 | unsigned int xferred; |
| 2276 | int result; |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2277 | bool more; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2278 | |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2279 | rbd_assert(obj_request_img_data_test(obj_request)); |
| 2280 | img_request = obj_request->img_request; |
| 2281 | |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2282 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
| 2283 | xferred = (unsigned int)obj_request->xferred; |
| 2284 | result = obj_request->result; |
| 2285 | if (result) { |
| 2286 | struct rbd_device *rbd_dev = img_request->rbd_dev; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2287 | enum obj_operation_type op_type; |
| 2288 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 2289 | if (img_request_discard_test(img_request)) |
| 2290 | op_type = OBJ_OP_DISCARD; |
| 2291 | else if (img_request_write_test(img_request)) |
| 2292 | op_type = OBJ_OP_WRITE; |
| 2293 | else |
| 2294 | op_type = OBJ_OP_READ; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2295 | |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 2296 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2297 | obj_op_name(op_type), obj_request->length, |
| 2298 | obj_request->img_offset, obj_request->offset); |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 2299 | rbd_warn(rbd_dev, " result %d xferred %x", |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2300 | result, xferred); |
| 2301 | if (!img_request->result) |
| 2302 | img_request->result = result; |
Ilya Dryomov | 082a75d | 2015-04-25 15:56:15 +0300 | [diff] [blame] | 2303 | /* |
| 2304 | * Need to end I/O on the entire obj_request worth of |
| 2305 | * bytes in case of error. |
| 2306 | */ |
| 2307 | xferred = obj_request->length; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2308 | } |
| 2309 | |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2310 | /* Image object requests don't own their page array */ |
| 2311 | |
| 2312 | if (obj_request->type == OBJ_REQUEST_PAGES) { |
| 2313 | obj_request->pages = NULL; |
| 2314 | obj_request->page_count = 0; |
| 2315 | } |
| 2316 | |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2317 | if (img_request_child_test(img_request)) { |
| 2318 | rbd_assert(img_request->obj_request != NULL); |
| 2319 | more = obj_request->which < img_request->obj_request_count - 1; |
| 2320 | } else { |
| 2321 | rbd_assert(img_request->rq != NULL); |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 2322 | |
| 2323 | more = blk_update_request(img_request->rq, result, xferred); |
| 2324 | if (!more) |
| 2325 | __blk_mq_end_request(img_request->rq, result); |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2326 | } |
| 2327 | |
| 2328 | return more; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2329 | } |
| 2330 | |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2331 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
| 2332 | { |
| 2333 | struct rbd_img_request *img_request; |
| 2334 | u32 which = obj_request->which; |
| 2335 | bool more = true; |
| 2336 | |
Alex Elder | 6365d33 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2337 | rbd_assert(obj_request_img_data_test(obj_request)); |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2338 | img_request = obj_request->img_request; |
| 2339 | |
| 2340 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
| 2341 | rbd_assert(img_request != NULL); |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2342 | rbd_assert(img_request->obj_request_count > 0); |
| 2343 | rbd_assert(which != BAD_WHICH); |
| 2344 | rbd_assert(which < img_request->obj_request_count); |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2345 | |
| 2346 | spin_lock_irq(&img_request->completion_lock); |
| 2347 | if (which != img_request->next_completion) |
| 2348 | goto out; |
| 2349 | |
| 2350 | for_each_obj_request_from(img_request, obj_request) { |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2351 | rbd_assert(more); |
| 2352 | rbd_assert(which < img_request->obj_request_count); |
| 2353 | |
| 2354 | if (!obj_request_done_test(obj_request)) |
| 2355 | break; |
Alex Elder | 1217857f | 2013-02-08 09:55:49 -0600 | [diff] [blame] | 2356 | more = rbd_img_obj_end_request(obj_request); |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2357 | which++; |
| 2358 | } |
| 2359 | |
| 2360 | rbd_assert(more ^ (which == img_request->obj_request_count)); |
| 2361 | img_request->next_completion = which; |
| 2362 | out: |
| 2363 | spin_unlock_irq(&img_request->completion_lock); |
Alex Elder | 0f2d5be | 2014-04-26 14:21:44 +0400 | [diff] [blame] | 2364 | rbd_img_request_put(img_request); |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2365 | |
| 2366 | if (!more) |
| 2367 | rbd_img_request_complete(img_request); |
| 2368 | } |
| 2369 | |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2370 | /* |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2371 | * Add individual osd ops to the given ceph_osd_request and prepare |
| 2372 | * them for submission. num_ops is the current number of |
| 2373 | * osd operations already to the object request. |
| 2374 | */ |
| 2375 | static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, |
| 2376 | struct ceph_osd_request *osd_request, |
| 2377 | enum obj_operation_type op_type, |
| 2378 | unsigned int num_ops) |
| 2379 | { |
| 2380 | struct rbd_img_request *img_request = obj_request->img_request; |
| 2381 | struct rbd_device *rbd_dev = img_request->rbd_dev; |
| 2382 | u64 object_size = rbd_obj_bytes(&rbd_dev->header); |
| 2383 | u64 offset = obj_request->offset; |
| 2384 | u64 length = obj_request->length; |
| 2385 | u64 img_end; |
| 2386 | u16 opcode; |
| 2387 | |
| 2388 | if (op_type == OBJ_OP_DISCARD) { |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2389 | if (!offset && length == object_size && |
| 2390 | (!img_request_layered_test(img_request) || |
| 2391 | !obj_request_overlaps_parent(obj_request))) { |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2392 | opcode = CEPH_OSD_OP_DELETE; |
| 2393 | } else if ((offset + length == object_size)) { |
| 2394 | opcode = CEPH_OSD_OP_TRUNCATE; |
| 2395 | } else { |
| 2396 | down_read(&rbd_dev->header_rwsem); |
| 2397 | img_end = rbd_dev->header.image_size; |
| 2398 | up_read(&rbd_dev->header_rwsem); |
| 2399 | |
| 2400 | if (obj_request->img_offset + length == img_end) |
| 2401 | opcode = CEPH_OSD_OP_TRUNCATE; |
| 2402 | else |
| 2403 | opcode = CEPH_OSD_OP_ZERO; |
| 2404 | } |
| 2405 | } else if (op_type == OBJ_OP_WRITE) { |
Ilya Dryomov | e30b757 | 2015-10-07 17:27:17 +0200 | [diff] [blame] | 2406 | if (!offset && length == object_size) |
| 2407 | opcode = CEPH_OSD_OP_WRITEFULL; |
| 2408 | else |
| 2409 | opcode = CEPH_OSD_OP_WRITE; |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2410 | osd_req_op_alloc_hint_init(osd_request, num_ops, |
| 2411 | object_size, object_size); |
| 2412 | num_ops++; |
| 2413 | } else { |
| 2414 | opcode = CEPH_OSD_OP_READ; |
| 2415 | } |
| 2416 | |
Ilya Dryomov | 7e868b6 | 2014-11-21 22:16:43 +0300 | [diff] [blame] | 2417 | if (opcode == CEPH_OSD_OP_DELETE) |
Yan, Zheng | 144cba1 | 2015-04-27 11:09:54 +0800 | [diff] [blame] | 2418 | osd_req_op_init(osd_request, num_ops, opcode, 0); |
Ilya Dryomov | 7e868b6 | 2014-11-21 22:16:43 +0300 | [diff] [blame] | 2419 | else |
| 2420 | osd_req_op_extent_init(osd_request, num_ops, opcode, |
| 2421 | offset, length, 0, 0); |
| 2422 | |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2423 | if (obj_request->type == OBJ_REQUEST_BIO) |
| 2424 | osd_req_op_extent_osd_data_bio(osd_request, num_ops, |
| 2425 | obj_request->bio_list, length); |
| 2426 | else if (obj_request->type == OBJ_REQUEST_PAGES) |
| 2427 | osd_req_op_extent_osd_data_pages(osd_request, num_ops, |
| 2428 | obj_request->pages, length, |
| 2429 | offset & ~PAGE_MASK, false, false); |
| 2430 | |
| 2431 | /* Discards are also writes */ |
| 2432 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
| 2433 | rbd_osd_req_format_write(obj_request); |
| 2434 | else |
| 2435 | rbd_osd_req_format_read(obj_request); |
| 2436 | } |
| 2437 | |
| 2438 | /* |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2439 | * Split up an image request into one or more object requests, each |
| 2440 | * to a different object. The "type" parameter indicates whether |
| 2441 | * "data_desc" is the pointer to the head of a list of bio |
| 2442 | * structures, or the base of a page array. In either case this |
| 2443 | * function assumes data_desc describes memory sufficient to hold |
| 2444 | * all data described by the image request. |
| 2445 | */ |
| 2446 | static int rbd_img_request_fill(struct rbd_img_request *img_request, |
| 2447 | enum obj_request_type type, |
| 2448 | void *data_desc) |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2449 | { |
| 2450 | struct rbd_device *rbd_dev = img_request->rbd_dev; |
| 2451 | struct rbd_obj_request *obj_request = NULL; |
| 2452 | struct rbd_obj_request *next_obj_request; |
Jingoo Han | a158073 | 2013-08-09 13:04:35 +0900 | [diff] [blame] | 2453 | struct bio *bio_list = NULL; |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2454 | unsigned int bio_offset = 0; |
Jingoo Han | a158073 | 2013-08-09 13:04:35 +0900 | [diff] [blame] | 2455 | struct page **pages = NULL; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2456 | enum obj_operation_type op_type; |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2457 | u64 img_offset; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2458 | u64 resid; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2459 | |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2460 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
| 2461 | (int)type, data_desc); |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2462 | |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2463 | img_offset = img_request->offset; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2464 | resid = img_request->length; |
Alex Elder | 4dda41d | 2013-02-20 21:59:33 -0600 | [diff] [blame] | 2465 | rbd_assert(resid > 0); |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2466 | op_type = rbd_img_request_op_type(img_request); |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2467 | |
| 2468 | if (type == OBJ_REQUEST_BIO) { |
| 2469 | bio_list = data_desc; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 2470 | rbd_assert(img_offset == |
| 2471 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 2472 | } else if (type == OBJ_REQUEST_PAGES) { |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2473 | pages = data_desc; |
| 2474 | } |
| 2475 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2476 | while (resid) { |
Alex Elder | 2fa1232 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2477 | struct ceph_osd_request *osd_req; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2478 | const char *object_name; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2479 | u64 offset; |
| 2480 | u64 length; |
| 2481 | |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2482 | object_name = rbd_segment_name(rbd_dev, img_offset); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2483 | if (!object_name) |
| 2484 | goto out_unwind; |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2485 | offset = rbd_segment_offset(rbd_dev, img_offset); |
| 2486 | length = rbd_segment_length(rbd_dev, img_offset, resid); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2487 | obj_request = rbd_obj_request_create(object_name, |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2488 | offset, length, type); |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 2489 | /* object request has its own copy of the object name */ |
| 2490 | rbd_segment_name_free(object_name); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2491 | if (!obj_request) |
| 2492 | goto out_unwind; |
Ilya Dryomov | 62054da | 2014-03-04 11:57:17 +0200 | [diff] [blame] | 2493 | |
Josh Durgin | 03507db | 2013-08-27 14:45:46 -0700 | [diff] [blame] | 2494 | /* |
| 2495 | * set obj_request->img_request before creating the |
| 2496 | * osd_request so that it gets the right snapc |
| 2497 | */ |
| 2498 | rbd_img_obj_request_add(img_request, obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2499 | |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2500 | if (type == OBJ_REQUEST_BIO) { |
| 2501 | unsigned int clone_size; |
| 2502 | |
| 2503 | rbd_assert(length <= (u64)UINT_MAX); |
| 2504 | clone_size = (unsigned int)length; |
| 2505 | obj_request->bio_list = |
| 2506 | bio_chain_clone_range(&bio_list, |
| 2507 | &bio_offset, |
| 2508 | clone_size, |
| 2509 | GFP_ATOMIC); |
| 2510 | if (!obj_request->bio_list) |
Ilya Dryomov | 62054da | 2014-03-04 11:57:17 +0200 | [diff] [blame] | 2511 | goto out_unwind; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 2512 | } else if (type == OBJ_REQUEST_PAGES) { |
Alex Elder | f1a4739 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2513 | unsigned int page_count; |
| 2514 | |
| 2515 | obj_request->pages = pages; |
| 2516 | page_count = (u32)calc_pages_for(offset, length); |
| 2517 | obj_request->page_count = page_count; |
| 2518 | if ((offset + length) & ~PAGE_MASK) |
| 2519 | page_count--; /* more on last page */ |
| 2520 | pages += page_count; |
| 2521 | } |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2522 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2523 | osd_req = rbd_osd_req_create(rbd_dev, op_type, |
| 2524 | (op_type == OBJ_OP_WRITE) ? 2 : 1, |
| 2525 | obj_request); |
Alex Elder | 2fa1232 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2526 | if (!osd_req) |
Ilya Dryomov | 62054da | 2014-03-04 11:57:17 +0200 | [diff] [blame] | 2527 | goto out_unwind; |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2528 | |
Alex Elder | 2fa1232 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2529 | obj_request->osd_req = osd_req; |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 2530 | obj_request->callback = rbd_img_obj_callback; |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2531 | obj_request->img_offset = img_offset; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2532 | |
Josh Durgin | 3b434a2a | 2014-04-04 17:32:15 -0700 | [diff] [blame] | 2533 | rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
| 2534 | |
| 2535 | rbd_img_request_get(img_request); |
| 2536 | |
Alex Elder | 7da22d2 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2537 | img_offset += length; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2538 | resid -= length; |
| 2539 | } |
| 2540 | |
| 2541 | return 0; |
| 2542 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2543 | out_unwind: |
| 2544 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
Ilya Dryomov | 42dd037 | 2014-03-04 11:57:17 +0200 | [diff] [blame] | 2545 | rbd_img_obj_request_del(img_request, obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2546 | |
| 2547 | return -ENOMEM; |
| 2548 | } |
| 2549 | |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2550 | static void |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 2551 | rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2552 | { |
| 2553 | struct rbd_img_request *img_request; |
| 2554 | struct rbd_device *rbd_dev; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2555 | struct page **pages; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2556 | u32 page_count; |
| 2557 | |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 2558 | dout("%s: obj %p\n", __func__, obj_request); |
| 2559 | |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2560 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
| 2561 | obj_request->type == OBJ_REQUEST_NODATA); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2562 | rbd_assert(obj_request_img_data_test(obj_request)); |
| 2563 | img_request = obj_request->img_request; |
| 2564 | rbd_assert(img_request); |
| 2565 | |
| 2566 | rbd_dev = img_request->rbd_dev; |
| 2567 | rbd_assert(rbd_dev); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2568 | |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2569 | pages = obj_request->copyup_pages; |
| 2570 | rbd_assert(pages != NULL); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2571 | obj_request->copyup_pages = NULL; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2572 | page_count = obj_request->copyup_page_count; |
| 2573 | rbd_assert(page_count); |
| 2574 | obj_request->copyup_page_count = 0; |
| 2575 | ceph_release_page_vector(pages, page_count); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2576 | |
| 2577 | /* |
| 2578 | * We want the transfer count to reflect the size of the |
| 2579 | * original write request. There is no such thing as a |
| 2580 | * successful short write, so if the request was successful |
| 2581 | * we can just set it to the originally-requested length. |
| 2582 | */ |
| 2583 | if (!obj_request->result) |
| 2584 | obj_request->xferred = obj_request->length; |
| 2585 | |
Ilya Dryomov | 2761713 | 2015-07-16 17:36:11 +0300 | [diff] [blame] | 2586 | obj_request_done_set(obj_request); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2587 | } |
| 2588 | |
| 2589 | static void |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2590 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) |
| 2591 | { |
| 2592 | struct rbd_obj_request *orig_request; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2593 | struct ceph_osd_request *osd_req; |
| 2594 | struct ceph_osd_client *osdc; |
| 2595 | struct rbd_device *rbd_dev; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2596 | struct page **pages; |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2597 | enum obj_operation_type op_type; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2598 | u32 page_count; |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2599 | int img_result; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2600 | u64 parent_length; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2601 | |
| 2602 | rbd_assert(img_request_child_test(img_request)); |
| 2603 | |
| 2604 | /* First get what we need from the image request */ |
| 2605 | |
| 2606 | pages = img_request->copyup_pages; |
| 2607 | rbd_assert(pages != NULL); |
| 2608 | img_request->copyup_pages = NULL; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2609 | page_count = img_request->copyup_page_count; |
| 2610 | rbd_assert(page_count); |
| 2611 | img_request->copyup_page_count = 0; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2612 | |
| 2613 | orig_request = img_request->obj_request; |
| 2614 | rbd_assert(orig_request != NULL); |
Alex Elder | b91f09f | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2615 | rbd_assert(obj_request_type_valid(orig_request->type)); |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2616 | img_result = img_request->result; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2617 | parent_length = img_request->length; |
| 2618 | rbd_assert(parent_length == img_request->xferred); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2619 | rbd_img_request_put(img_request); |
| 2620 | |
Alex Elder | 91c6feb | 2013-05-06 17:40:32 -0500 | [diff] [blame] | 2621 | rbd_assert(orig_request->img_request); |
| 2622 | rbd_dev = orig_request->img_request->rbd_dev; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2623 | rbd_assert(rbd_dev); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2624 | |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2625 | /* |
| 2626 | * If the overlap has become 0 (most likely because the |
| 2627 | * image has been flattened) we need to free the pages |
| 2628 | * and re-submit the original write request. |
| 2629 | */ |
| 2630 | if (!rbd_dev->parent_overlap) { |
| 2631 | struct ceph_osd_client *osdc; |
| 2632 | |
| 2633 | ceph_release_page_vector(pages, page_count); |
| 2634 | osdc = &rbd_dev->rbd_client->client->osdc; |
| 2635 | img_result = rbd_obj_request_submit(osdc, orig_request); |
| 2636 | if (!img_result) |
| 2637 | return; |
| 2638 | } |
| 2639 | |
| 2640 | if (img_result) |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2641 | goto out_err; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2642 | |
Alex Elder | 8785b1d | 2013-05-09 10:08:49 -0500 | [diff] [blame] | 2643 | /* |
| 2644 | * The original osd request is of no use to use any more. |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 2645 | * We need a new one that can hold the three ops in a copyup |
Alex Elder | 8785b1d | 2013-05-09 10:08:49 -0500 | [diff] [blame] | 2646 | * request. Allocate the new copyup osd request for the |
| 2647 | * original request, and release the old one. |
| 2648 | */ |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2649 | img_result = -ENOMEM; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2650 | osd_req = rbd_osd_req_create_copyup(orig_request); |
| 2651 | if (!osd_req) |
| 2652 | goto out_err; |
Alex Elder | 8785b1d | 2013-05-09 10:08:49 -0500 | [diff] [blame] | 2653 | rbd_osd_req_destroy(orig_request->osd_req); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2654 | orig_request->osd_req = osd_req; |
| 2655 | orig_request->copyup_pages = pages; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2656 | orig_request->copyup_page_count = page_count; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2657 | |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2658 | /* Initialize the copyup op */ |
| 2659 | |
| 2660 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2661 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2662 | false, false); |
| 2663 | |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2664 | /* Add the other op(s) */ |
Ilya Dryomov | 0ccd592 | 2014-02-25 16:22:28 +0200 | [diff] [blame] | 2665 | |
Josh Durgin | d3246fb | 2014-04-07 16:49:21 -0700 | [diff] [blame] | 2666 | op_type = rbd_img_request_op_type(orig_request->img_request); |
| 2667 | rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2668 | |
| 2669 | /* All set, send it off. */ |
| 2670 | |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2671 | osdc = &rbd_dev->rbd_client->client->osdc; |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2672 | img_result = rbd_obj_request_submit(osdc, orig_request); |
| 2673 | if (!img_result) |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2674 | return; |
| 2675 | out_err: |
| 2676 | /* Record the error code and complete the request */ |
| 2677 | |
Alex Elder | bbea1c1 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2678 | orig_request->result = img_result; |
Alex Elder | 0eefd47 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2679 | orig_request->xferred = 0; |
| 2680 | obj_request_done_set(orig_request); |
| 2681 | rbd_obj_request_complete(orig_request); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2682 | } |
| 2683 | |
| 2684 | /* |
| 2685 | * Read from the parent image the range of data that covers the |
| 2686 | * entire target of the given object request. This is used for |
| 2687 | * satisfying a layered image write request when the target of an |
| 2688 | * object request from the image request does not exist. |
| 2689 | * |
| 2690 | * A page array big enough to hold the returned data is allocated |
| 2691 | * and supplied to rbd_img_request_fill() as the "data descriptor." |
| 2692 | * When the read completes, this page array will be transferred to |
| 2693 | * the original object request for the copyup operation. |
| 2694 | * |
| 2695 | * If an error occurs, record it as the result of the original |
| 2696 | * object request and mark it done so it gets completed. |
| 2697 | */ |
| 2698 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) |
| 2699 | { |
| 2700 | struct rbd_img_request *img_request = NULL; |
| 2701 | struct rbd_img_request *parent_request = NULL; |
| 2702 | struct rbd_device *rbd_dev; |
| 2703 | u64 img_offset; |
| 2704 | u64 length; |
| 2705 | struct page **pages = NULL; |
| 2706 | u32 page_count; |
| 2707 | int result; |
| 2708 | |
| 2709 | rbd_assert(obj_request_img_data_test(obj_request)); |
Alex Elder | b91f09f | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2710 | rbd_assert(obj_request_type_valid(obj_request->type)); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2711 | |
| 2712 | img_request = obj_request->img_request; |
| 2713 | rbd_assert(img_request != NULL); |
| 2714 | rbd_dev = img_request->rbd_dev; |
| 2715 | rbd_assert(rbd_dev->parent != NULL); |
| 2716 | |
| 2717 | /* |
| 2718 | * Determine the byte range covered by the object in the |
| 2719 | * child image to which the original request was to be sent. |
| 2720 | */ |
| 2721 | img_offset = obj_request->img_offset - obj_request->offset; |
| 2722 | length = (u64)1 << rbd_dev->header.obj_order; |
| 2723 | |
| 2724 | /* |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 2725 | * There is no defined parent data beyond the parent |
| 2726 | * overlap, so limit what we read at that boundary if |
| 2727 | * necessary. |
| 2728 | */ |
| 2729 | if (img_offset + length > rbd_dev->parent_overlap) { |
| 2730 | rbd_assert(img_offset < rbd_dev->parent_overlap); |
| 2731 | length = rbd_dev->parent_overlap - img_offset; |
| 2732 | } |
| 2733 | |
| 2734 | /* |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2735 | * Allocate a page array big enough to receive the data read |
| 2736 | * from the parent. |
| 2737 | */ |
| 2738 | page_count = (u32)calc_pages_for(0, length); |
| 2739 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| 2740 | if (IS_ERR(pages)) { |
| 2741 | result = PTR_ERR(pages); |
| 2742 | pages = NULL; |
| 2743 | goto out_err; |
| 2744 | } |
| 2745 | |
| 2746 | result = -ENOMEM; |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 2747 | parent_request = rbd_parent_request_create(obj_request, |
| 2748 | img_offset, length); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2749 | if (!parent_request) |
| 2750 | goto out_err; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2751 | |
| 2752 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); |
| 2753 | if (result) |
| 2754 | goto out_err; |
| 2755 | parent_request->copyup_pages = pages; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2756 | parent_request->copyup_page_count = page_count; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2757 | |
| 2758 | parent_request->callback = rbd_img_obj_parent_read_full_callback; |
| 2759 | result = rbd_img_request_submit(parent_request); |
| 2760 | if (!result) |
| 2761 | return 0; |
| 2762 | |
| 2763 | parent_request->copyup_pages = NULL; |
Alex Elder | ebda640 | 2013-05-10 16:29:22 -0500 | [diff] [blame] | 2764 | parent_request->copyup_page_count = 0; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2765 | parent_request->obj_request = NULL; |
| 2766 | rbd_obj_request_put(obj_request); |
| 2767 | out_err: |
| 2768 | if (pages) |
| 2769 | ceph_release_page_vector(pages, page_count); |
| 2770 | if (parent_request) |
| 2771 | rbd_img_request_put(parent_request); |
| 2772 | obj_request->result = result; |
| 2773 | obj_request->xferred = 0; |
| 2774 | obj_request_done_set(obj_request); |
| 2775 | |
| 2776 | return result; |
| 2777 | } |
| 2778 | |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2779 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
| 2780 | { |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2781 | struct rbd_obj_request *orig_request; |
Alex Elder | 638f5ab | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2782 | struct rbd_device *rbd_dev; |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2783 | int result; |
| 2784 | |
| 2785 | rbd_assert(!obj_request_img_data_test(obj_request)); |
| 2786 | |
| 2787 | /* |
| 2788 | * All we need from the object request is the original |
| 2789 | * request and the result of the STAT op. Grab those, then |
| 2790 | * we're done with the request. |
| 2791 | */ |
| 2792 | orig_request = obj_request->obj_request; |
| 2793 | obj_request->obj_request = NULL; |
Alex Elder | 912c317 | 2013-05-13 20:35:38 -0500 | [diff] [blame] | 2794 | rbd_obj_request_put(orig_request); |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2795 | rbd_assert(orig_request); |
| 2796 | rbd_assert(orig_request->img_request); |
| 2797 | |
| 2798 | result = obj_request->result; |
| 2799 | obj_request->result = 0; |
| 2800 | |
| 2801 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, |
| 2802 | obj_request, orig_request, result, |
| 2803 | obj_request->xferred, obj_request->length); |
| 2804 | rbd_obj_request_put(obj_request); |
| 2805 | |
Alex Elder | 638f5ab | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2806 | /* |
| 2807 | * If the overlap has become 0 (most likely because the |
| 2808 | * image has been flattened) we need to free the pages |
| 2809 | * and re-submit the original write request. |
| 2810 | */ |
| 2811 | rbd_dev = orig_request->img_request->rbd_dev; |
| 2812 | if (!rbd_dev->parent_overlap) { |
| 2813 | struct ceph_osd_client *osdc; |
| 2814 | |
Alex Elder | 638f5ab | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2815 | osdc = &rbd_dev->rbd_client->client->osdc; |
| 2816 | result = rbd_obj_request_submit(osdc, orig_request); |
| 2817 | if (!result) |
| 2818 | return; |
| 2819 | } |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2820 | |
| 2821 | /* |
| 2822 | * Our only purpose here is to determine whether the object |
| 2823 | * exists, and we don't want to treat the non-existence as |
| 2824 | * an error. If something else comes back, transfer the |
| 2825 | * error to the original request and complete it now. |
| 2826 | */ |
| 2827 | if (!result) { |
| 2828 | obj_request_existence_set(orig_request, true); |
| 2829 | } else if (result == -ENOENT) { |
| 2830 | obj_request_existence_set(orig_request, false); |
| 2831 | } else if (result) { |
| 2832 | orig_request->result = result; |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2833 | goto out; |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2834 | } |
| 2835 | |
| 2836 | /* |
| 2837 | * Resubmit the original request now that we have recorded |
| 2838 | * whether the target object exists. |
| 2839 | */ |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2840 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2841 | out: |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2842 | if (orig_request->result) |
| 2843 | rbd_obj_request_complete(orig_request); |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2844 | } |
| 2845 | |
| 2846 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) |
| 2847 | { |
| 2848 | struct rbd_obj_request *stat_request; |
| 2849 | struct rbd_device *rbd_dev; |
| 2850 | struct ceph_osd_client *osdc; |
| 2851 | struct page **pages = NULL; |
| 2852 | u32 page_count; |
| 2853 | size_t size; |
| 2854 | int ret; |
| 2855 | |
| 2856 | /* |
| 2857 | * The response data for a STAT call consists of: |
| 2858 | * le64 length; |
| 2859 | * struct { |
| 2860 | * le32 tv_sec; |
| 2861 | * le32 tv_nsec; |
| 2862 | * } mtime; |
| 2863 | */ |
| 2864 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); |
| 2865 | page_count = (u32)calc_pages_for(0, size); |
| 2866 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| 2867 | if (IS_ERR(pages)) |
| 2868 | return PTR_ERR(pages); |
| 2869 | |
| 2870 | ret = -ENOMEM; |
| 2871 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, |
| 2872 | OBJ_REQUEST_PAGES); |
| 2873 | if (!stat_request) |
| 2874 | goto out; |
| 2875 | |
| 2876 | rbd_obj_request_get(obj_request); |
| 2877 | stat_request->obj_request = obj_request; |
| 2878 | stat_request->pages = pages; |
| 2879 | stat_request->page_count = page_count; |
| 2880 | |
| 2881 | rbd_assert(obj_request->img_request); |
| 2882 | rbd_dev = obj_request->img_request->rbd_dev; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 2883 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 2884 | stat_request); |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2885 | if (!stat_request->osd_req) |
| 2886 | goto out; |
| 2887 | stat_request->callback = rbd_img_obj_exists_callback; |
| 2888 | |
Yan, Zheng | 144cba1 | 2015-04-27 11:09:54 +0800 | [diff] [blame] | 2889 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2890 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, |
| 2891 | false, false); |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2892 | rbd_osd_req_format_read(stat_request); |
Alex Elder | c5b5ef6 | 2013-02-11 12:33:24 -0600 | [diff] [blame] | 2893 | |
| 2894 | osdc = &rbd_dev->rbd_client->client->osdc; |
| 2895 | ret = rbd_obj_request_submit(osdc, stat_request); |
| 2896 | out: |
| 2897 | if (ret) |
| 2898 | rbd_obj_request_put(obj_request); |
| 2899 | |
| 2900 | return ret; |
| 2901 | } |
| 2902 | |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2903 | static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2904 | { |
| 2905 | struct rbd_img_request *img_request; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 2906 | struct rbd_device *rbd_dev; |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2907 | |
| 2908 | rbd_assert(obj_request_img_data_test(obj_request)); |
| 2909 | |
| 2910 | img_request = obj_request->img_request; |
| 2911 | rbd_assert(img_request); |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 2912 | rbd_dev = img_request->rbd_dev; |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2913 | |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2914 | /* Reads */ |
Josh Durgin | 1c22088 | 2014-04-04 17:49:12 -0700 | [diff] [blame] | 2915 | if (!img_request_write_test(img_request) && |
| 2916 | !img_request_discard_test(img_request)) |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2917 | return true; |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2918 | |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2919 | /* Non-layered writes */ |
| 2920 | if (!img_request_layered_test(img_request)) |
| 2921 | return true; |
| 2922 | |
| 2923 | /* |
| 2924 | * Layered writes outside of the parent overlap range don't |
| 2925 | * share any data with the parent. |
| 2926 | */ |
| 2927 | if (!obj_request_overlaps_parent(obj_request)) |
| 2928 | return true; |
| 2929 | |
| 2930 | /* |
Guangliang Zhao | c622d22 | 2014-04-01 22:22:15 +0800 | [diff] [blame] | 2931 | * Entire-object layered writes - we will overwrite whatever |
| 2932 | * parent data there is anyway. |
| 2933 | */ |
| 2934 | if (!obj_request->offset && |
| 2935 | obj_request->length == rbd_obj_bytes(&rbd_dev->header)) |
| 2936 | return true; |
| 2937 | |
| 2938 | /* |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2939 | * If the object is known to already exist, its parent data has |
| 2940 | * already been copied. |
| 2941 | */ |
| 2942 | if (obj_request_known_test(obj_request) && |
| 2943 | obj_request_exists_test(obj_request)) |
| 2944 | return true; |
| 2945 | |
| 2946 | return false; |
| 2947 | } |
| 2948 | |
| 2949 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
| 2950 | { |
| 2951 | if (img_obj_request_simple(obj_request)) { |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2952 | struct rbd_device *rbd_dev; |
| 2953 | struct ceph_osd_client *osdc; |
| 2954 | |
| 2955 | rbd_dev = obj_request->img_request->rbd_dev; |
| 2956 | osdc = &rbd_dev->rbd_client->client->osdc; |
| 2957 | |
| 2958 | return rbd_obj_request_submit(osdc, obj_request); |
| 2959 | } |
| 2960 | |
| 2961 | /* |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2962 | * It's a layered write. The target object might exist but |
| 2963 | * we may not know that yet. If we know it doesn't exist, |
| 2964 | * start by reading the data for the full target object from |
| 2965 | * the parent so we can use it for a copyup to the target. |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2966 | */ |
Ilya Dryomov | 70d045f | 2014-09-12 16:02:01 +0400 | [diff] [blame] | 2967 | if (obj_request_known_test(obj_request)) |
Alex Elder | 3d7efd1 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2968 | return rbd_img_obj_parent_read_full(obj_request); |
| 2969 | |
| 2970 | /* We don't know whether the target exists. Go find out. */ |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2971 | |
| 2972 | return rbd_img_obj_exists_submit(obj_request); |
| 2973 | } |
| 2974 | |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2975 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
| 2976 | { |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2977 | struct rbd_obj_request *obj_request; |
Alex Elder | 46faeed | 2013-04-10 17:47:46 -0500 | [diff] [blame] | 2978 | struct rbd_obj_request *next_obj_request; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2979 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 2980 | dout("%s: img %p\n", __func__, img_request); |
Alex Elder | 46faeed | 2013-04-10 17:47:46 -0500 | [diff] [blame] | 2981 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2982 | int ret; |
| 2983 | |
Alex Elder | b454e36 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 2984 | ret = rbd_img_obj_request_submit(obj_request); |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2985 | if (ret) |
| 2986 | return ret; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 2987 | } |
| 2988 | |
| 2989 | return 0; |
| 2990 | } |
| 2991 | |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2992 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) |
| 2993 | { |
| 2994 | struct rbd_obj_request *obj_request; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 2995 | struct rbd_device *rbd_dev; |
| 2996 | u64 obj_end; |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 2997 | u64 img_xferred; |
| 2998 | int img_result; |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 2999 | |
| 3000 | rbd_assert(img_request_child_test(img_request)); |
| 3001 | |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3002 | /* First get what we need from the image request and release it */ |
| 3003 | |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3004 | obj_request = img_request->obj_request; |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3005 | img_xferred = img_request->xferred; |
| 3006 | img_result = img_request->result; |
| 3007 | rbd_img_request_put(img_request); |
| 3008 | |
| 3009 | /* |
| 3010 | * If the overlap has become 0 (most likely because the |
| 3011 | * image has been flattened) we need to re-submit the |
| 3012 | * original request. |
| 3013 | */ |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 3014 | rbd_assert(obj_request); |
| 3015 | rbd_assert(obj_request->img_request); |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3016 | rbd_dev = obj_request->img_request->rbd_dev; |
| 3017 | if (!rbd_dev->parent_overlap) { |
| 3018 | struct ceph_osd_client *osdc; |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3019 | |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3020 | osdc = &rbd_dev->rbd_client->client->osdc; |
| 3021 | img_result = rbd_obj_request_submit(osdc, obj_request); |
| 3022 | if (!img_result) |
| 3023 | return; |
| 3024 | } |
| 3025 | |
| 3026 | obj_request->result = img_result; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 3027 | if (obj_request->result) |
| 3028 | goto out; |
| 3029 | |
| 3030 | /* |
| 3031 | * We need to zero anything beyond the parent overlap |
| 3032 | * boundary. Since rbd_img_obj_request_read_callback() |
| 3033 | * will zero anything beyond the end of a short read, an |
| 3034 | * easy way to do this is to pretend the data from the |
| 3035 | * parent came up short--ending at the overlap boundary. |
| 3036 | */ |
| 3037 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); |
| 3038 | obj_end = obj_request->img_offset + obj_request->length; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 3039 | if (obj_end > rbd_dev->parent_overlap) { |
| 3040 | u64 xferred = 0; |
| 3041 | |
| 3042 | if (obj_request->img_offset < rbd_dev->parent_overlap) |
| 3043 | xferred = rbd_dev->parent_overlap - |
| 3044 | obj_request->img_offset; |
| 3045 | |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3046 | obj_request->xferred = min(img_xferred, xferred); |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 3047 | } else { |
Alex Elder | 02c74fb | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3048 | obj_request->xferred = img_xferred; |
Alex Elder | a9e8ba2c | 2013-04-21 00:32:07 -0500 | [diff] [blame] | 3049 | } |
| 3050 | out: |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3051 | rbd_img_obj_request_read_callback(obj_request); |
| 3052 | rbd_obj_request_complete(obj_request); |
| 3053 | } |
| 3054 | |
| 3055 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) |
| 3056 | { |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3057 | struct rbd_img_request *img_request; |
| 3058 | int result; |
| 3059 | |
| 3060 | rbd_assert(obj_request_img_data_test(obj_request)); |
| 3061 | rbd_assert(obj_request->img_request != NULL); |
| 3062 | rbd_assert(obj_request->result == (s32) -ENOENT); |
Alex Elder | 5b2ab72 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3063 | rbd_assert(obj_request_type_valid(obj_request->type)); |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3064 | |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3065 | /* rbd_read_finish(obj_request, obj_request->length); */ |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 3066 | img_request = rbd_parent_request_create(obj_request, |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3067 | obj_request->img_offset, |
Alex Elder | e93f315 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 3068 | obj_request->length); |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3069 | result = -ENOMEM; |
| 3070 | if (!img_request) |
| 3071 | goto out_err; |
| 3072 | |
Alex Elder | 5b2ab72 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 3073 | if (obj_request->type == OBJ_REQUEST_BIO) |
| 3074 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
| 3075 | obj_request->bio_list); |
| 3076 | else |
| 3077 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, |
| 3078 | obj_request->pages); |
Alex Elder | 8b3e1a5 | 2013-01-24 16:13:36 -0600 | [diff] [blame] | 3079 | if (result) |
| 3080 | goto out_err; |
| 3081 | |
| 3082 | img_request->callback = rbd_img_parent_read_callback; |
| 3083 | result = rbd_img_request_submit(img_request); |
| 3084 | if (result) |
| 3085 | goto out_err; |
| 3086 | |
| 3087 | return; |
| 3088 | out_err: |
| 3089 | if (img_request) |
| 3090 | rbd_img_request_put(img_request); |
| 3091 | obj_request->result = result; |
| 3092 | obj_request->xferred = 0; |
| 3093 | obj_request_done_set(obj_request); |
| 3094 | } |
| 3095 | |
Josh Durgin | 20e0af6 | 2013-08-29 17:36:03 -0700 | [diff] [blame] | 3096 | static int rbd_obj_notify_ack_sync(struct rbd_device *rbd_dev, u64 notify_id) |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3097 | { |
| 3098 | struct rbd_obj_request *obj_request; |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3099 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3100 | int ret; |
| 3101 | |
| 3102 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
| 3103 | OBJ_REQUEST_NODATA); |
| 3104 | if (!obj_request) |
| 3105 | return -ENOMEM; |
| 3106 | |
| 3107 | ret = -ENOMEM; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3108 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 3109 | obj_request); |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3110 | if (!obj_request->osd_req) |
| 3111 | goto out; |
| 3112 | |
Alex Elder | c99d2d4 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 3113 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3114 | notify_id, 0, 0); |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 3115 | rbd_osd_req_format_read(obj_request); |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 3116 | |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3117 | ret = rbd_obj_request_submit(osdc, obj_request); |
Alex Elder | cf81b60 | 2013-01-17 12:18:46 -0600 | [diff] [blame] | 3118 | if (ret) |
Josh Durgin | 20e0af6 | 2013-08-29 17:36:03 -0700 | [diff] [blame] | 3119 | goto out; |
| 3120 | ret = rbd_obj_request_wait(obj_request); |
| 3121 | out: |
| 3122 | rbd_obj_request_put(obj_request); |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3123 | |
| 3124 | return ret; |
| 3125 | } |
| 3126 | |
| 3127 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) |
| 3128 | { |
| 3129 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
Alex Elder | e627db0 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 3130 | int ret; |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3131 | |
| 3132 | if (!rbd_dev) |
| 3133 | return; |
| 3134 | |
Alex Elder | 37206ee | 2013-02-20 17:32:08 -0600 | [diff] [blame] | 3135 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3136 | rbd_dev->header_name, (unsigned long long)notify_id, |
| 3137 | (unsigned int)opcode); |
Ilya Dryomov | 52bb1f9 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 3138 | |
| 3139 | /* |
| 3140 | * Until adequate refresh error handling is in place, there is |
| 3141 | * not much we can do here, except warn. |
| 3142 | * |
| 3143 | * See http://tracker.ceph.com/issues/5040 |
| 3144 | */ |
Alex Elder | e627db0 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 3145 | ret = rbd_dev_refresh(rbd_dev); |
| 3146 | if (ret) |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 3147 | rbd_warn(rbd_dev, "refresh failed: %d", ret); |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3148 | |
Ilya Dryomov | 52bb1f9 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 3149 | ret = rbd_obj_notify_ack_sync(rbd_dev, notify_id); |
| 3150 | if (ret) |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 3151 | rbd_warn(rbd_dev, "notify_ack ret %d", ret); |
Alex Elder | b8d7003 | 2012-11-30 17:53:04 -0600 | [diff] [blame] | 3152 | } |
| 3153 | |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3154 | /* |
Ilya Dryomov | bb040aa | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 3155 | * Send a (un)watch request and wait for the ack. Return a request |
| 3156 | * with a ref held on success or error. |
| 3157 | */ |
| 3158 | static struct rbd_obj_request *rbd_obj_watch_request_helper( |
| 3159 | struct rbd_device *rbd_dev, |
| 3160 | bool watch) |
| 3161 | { |
| 3162 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 3163 | struct ceph_options *opts = osdc->client->options; |
Ilya Dryomov | bb040aa | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 3164 | struct rbd_obj_request *obj_request; |
| 3165 | int ret; |
| 3166 | |
| 3167 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
| 3168 | OBJ_REQUEST_NODATA); |
| 3169 | if (!obj_request) |
| 3170 | return ERR_PTR(-ENOMEM); |
| 3171 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3172 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_WRITE, 1, |
Ilya Dryomov | bb040aa | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 3173 | obj_request); |
| 3174 | if (!obj_request->osd_req) { |
| 3175 | ret = -ENOMEM; |
| 3176 | goto out; |
| 3177 | } |
| 3178 | |
| 3179 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, |
| 3180 | rbd_dev->watch_event->cookie, 0, watch); |
| 3181 | rbd_osd_req_format_write(obj_request); |
| 3182 | |
| 3183 | if (watch) |
| 3184 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
| 3185 | |
| 3186 | ret = rbd_obj_request_submit(osdc, obj_request); |
| 3187 | if (ret) |
| 3188 | goto out; |
| 3189 | |
Ilya Dryomov | 2894e1d | 2015-05-12 19:53:24 +0300 | [diff] [blame] | 3190 | ret = rbd_obj_request_wait_timeout(obj_request, opts->mount_timeout); |
Ilya Dryomov | bb040aa | 2014-06-19 11:38:14 +0400 | [diff] [blame] | 3191 | if (ret) |
| 3192 | goto out; |
| 3193 | |
| 3194 | ret = obj_request->result; |
| 3195 | if (ret) { |
| 3196 | if (watch) |
| 3197 | rbd_obj_request_end(obj_request); |
| 3198 | goto out; |
| 3199 | } |
| 3200 | |
| 3201 | return obj_request; |
| 3202 | |
| 3203 | out: |
| 3204 | rbd_obj_request_put(obj_request); |
| 3205 | return ERR_PTR(ret); |
| 3206 | } |
| 3207 | |
| 3208 | /* |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3209 | * Initiate a watch request, synchronously. |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3210 | */ |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3211 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev) |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3212 | { |
| 3213 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 3214 | struct rbd_obj_request *obj_request; |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3215 | int ret; |
| 3216 | |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3217 | rbd_assert(!rbd_dev->watch_event); |
| 3218 | rbd_assert(!rbd_dev->watch_request); |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3219 | |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3220 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
| 3221 | &rbd_dev->watch_event); |
| 3222 | if (ret < 0) |
| 3223 | return ret; |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3224 | |
Ilya Dryomov | 76756a5 | 2014-06-20 18:29:20 +0400 | [diff] [blame] | 3225 | obj_request = rbd_obj_watch_request_helper(rbd_dev, true); |
| 3226 | if (IS_ERR(obj_request)) { |
| 3227 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
| 3228 | rbd_dev->watch_event = NULL; |
| 3229 | return PTR_ERR(obj_request); |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3230 | } |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3231 | |
Alex Elder | 8eb8756 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 3232 | /* |
| 3233 | * A watch request is set to linger, so the underlying osd |
| 3234 | * request won't go away until we unregister it. We retain |
| 3235 | * a pointer to the object request during that time (in |
Ilya Dryomov | 76756a5 | 2014-06-20 18:29:20 +0400 | [diff] [blame] | 3236 | * rbd_dev->watch_request), so we'll keep a reference to it. |
| 3237 | * We'll drop that reference after we've unregistered it in |
| 3238 | * rbd_dev_header_unwatch_sync(). |
Alex Elder | 8eb8756 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 3239 | */ |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3240 | rbd_dev->watch_request = obj_request; |
Alex Elder | 8eb8756 | 2013-01-25 17:08:55 -0600 | [diff] [blame] | 3241 | |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3242 | return 0; |
Alex Elder | 9969ebc | 2013-01-18 12:31:10 -0600 | [diff] [blame] | 3243 | } |
| 3244 | |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3245 | /* |
| 3246 | * Tear down a watch request, synchronously. |
| 3247 | */ |
Ilya Dryomov | 76756a5 | 2014-06-20 18:29:20 +0400 | [diff] [blame] | 3248 | static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev) |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 3249 | { |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3250 | struct rbd_obj_request *obj_request; |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3251 | |
| 3252 | rbd_assert(rbd_dev->watch_event); |
| 3253 | rbd_assert(rbd_dev->watch_request); |
| 3254 | |
Ilya Dryomov | 76756a5 | 2014-06-20 18:29:20 +0400 | [diff] [blame] | 3255 | rbd_obj_request_end(rbd_dev->watch_request); |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3256 | rbd_obj_request_put(rbd_dev->watch_request); |
| 3257 | rbd_dev->watch_request = NULL; |
| 3258 | |
Ilya Dryomov | 76756a5 | 2014-06-20 18:29:20 +0400 | [diff] [blame] | 3259 | obj_request = rbd_obj_watch_request_helper(rbd_dev, false); |
| 3260 | if (!IS_ERR(obj_request)) |
| 3261 | rbd_obj_request_put(obj_request); |
| 3262 | else |
| 3263 | rbd_warn(rbd_dev, "unable to tear down watch request (%ld)", |
| 3264 | PTR_ERR(obj_request)); |
| 3265 | |
Ilya Dryomov | b30a01f | 2014-05-22 19:28:52 +0400 | [diff] [blame] | 3266 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
| 3267 | rbd_dev->watch_event = NULL; |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 3268 | } |
| 3269 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3270 | /* |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 3271 | * Synchronous osd object method call. Returns the number of bytes |
| 3272 | * returned in the outbound buffer, or a negative error code. |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3273 | */ |
| 3274 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
| 3275 | const char *object_name, |
| 3276 | const char *class_name, |
| 3277 | const char *method_name, |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 3278 | const void *outbound, |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3279 | size_t outbound_size, |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 3280 | void *inbound, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3281 | size_t inbound_size) |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3282 | { |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3283 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3284 | struct rbd_obj_request *obj_request; |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3285 | struct page **pages; |
| 3286 | u32 page_count; |
| 3287 | int ret; |
| 3288 | |
| 3289 | /* |
Alex Elder | 6010a45 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 3290 | * Method calls are ultimately read operations. The result |
| 3291 | * should placed into the inbound buffer provided. They |
| 3292 | * also supply outbound data--parameters for the object |
| 3293 | * method. Currently if this is present it will be a |
| 3294 | * snapshot id. |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3295 | */ |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 3296 | page_count = (u32)calc_pages_for(0, inbound_size); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3297 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| 3298 | if (IS_ERR(pages)) |
| 3299 | return PTR_ERR(pages); |
| 3300 | |
| 3301 | ret = -ENOMEM; |
Alex Elder | 6010a45 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 3302 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3303 | OBJ_REQUEST_PAGES); |
| 3304 | if (!obj_request) |
| 3305 | goto out; |
| 3306 | |
| 3307 | obj_request->pages = pages; |
| 3308 | obj_request->page_count = page_count; |
| 3309 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3310 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 3311 | obj_request); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3312 | if (!obj_request->osd_req) |
| 3313 | goto out; |
| 3314 | |
Alex Elder | c99d2d4 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 3315 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
Alex Elder | 04017e2 | 2013-04-05 14:46:02 -0500 | [diff] [blame] | 3316 | class_name, method_name); |
| 3317 | if (outbound_size) { |
| 3318 | struct ceph_pagelist *pagelist; |
| 3319 | |
| 3320 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); |
| 3321 | if (!pagelist) |
| 3322 | goto out; |
| 3323 | |
| 3324 | ceph_pagelist_init(pagelist); |
| 3325 | ceph_pagelist_append(pagelist, outbound, outbound_size); |
| 3326 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, |
| 3327 | pagelist); |
| 3328 | } |
Alex Elder | a4ce40a | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3329 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
| 3330 | obj_request->pages, inbound_size, |
Alex Elder | 44cd188 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3331 | 0, false, false); |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 3332 | rbd_osd_req_format_read(obj_request); |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 3333 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3334 | ret = rbd_obj_request_submit(osdc, obj_request); |
| 3335 | if (ret) |
| 3336 | goto out; |
| 3337 | ret = rbd_obj_request_wait(obj_request); |
| 3338 | if (ret) |
| 3339 | goto out; |
| 3340 | |
| 3341 | ret = obj_request->result; |
| 3342 | if (ret < 0) |
| 3343 | goto out; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 3344 | |
| 3345 | rbd_assert(obj_request->xferred < (u64)INT_MAX); |
| 3346 | ret = (int)obj_request->xferred; |
Alex Elder | 903bb32 | 2013-02-06 13:11:38 -0600 | [diff] [blame] | 3347 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3348 | out: |
| 3349 | if (obj_request) |
| 3350 | rbd_obj_request_put(obj_request); |
| 3351 | else |
| 3352 | ceph_release_page_vector(pages, page_count); |
| 3353 | |
| 3354 | return ret; |
| 3355 | } |
| 3356 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3357 | static void rbd_queue_workfn(struct work_struct *work) |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3358 | { |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3359 | struct request *rq = blk_mq_rq_from_pdu(work); |
| 3360 | struct rbd_device *rbd_dev = rq->q->queuedata; |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3361 | struct rbd_img_request *img_request; |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3362 | struct ceph_snap_context *snapc = NULL; |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3363 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
| 3364 | u64 length = blk_rq_bytes(rq); |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3365 | enum obj_operation_type op_type; |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3366 | u64 mapping_size; |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3367 | int result; |
| 3368 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3369 | if (rq->cmd_type != REQ_TYPE_FS) { |
| 3370 | dout("%s: non-fs request type %d\n", __func__, |
| 3371 | (int) rq->cmd_type); |
| 3372 | result = -EIO; |
| 3373 | goto err; |
| 3374 | } |
| 3375 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 3376 | if (rq->cmd_flags & REQ_DISCARD) |
| 3377 | op_type = OBJ_OP_DISCARD; |
| 3378 | else if (rq->cmd_flags & REQ_WRITE) |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3379 | op_type = OBJ_OP_WRITE; |
| 3380 | else |
| 3381 | op_type = OBJ_OP_READ; |
| 3382 | |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3383 | /* Ignore/skip any zero-length requests */ |
| 3384 | |
| 3385 | if (!length) { |
| 3386 | dout("%s: zero-length request\n", __func__); |
| 3387 | result = 0; |
| 3388 | goto err_rq; |
| 3389 | } |
| 3390 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3391 | /* Only reads are allowed to a read-only device */ |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3392 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3393 | if (op_type != OBJ_OP_READ) { |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3394 | if (rbd_dev->mapping.read_only) { |
| 3395 | result = -EROFS; |
| 3396 | goto err_rq; |
| 3397 | } |
| 3398 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
| 3399 | } |
| 3400 | |
| 3401 | /* |
| 3402 | * Quit early if the mapped snapshot no longer exists. It's |
| 3403 | * still possible the snapshot will have disappeared by the |
| 3404 | * time our request arrives at the osd, but there's no sense in |
| 3405 | * sending it if we already know. |
| 3406 | */ |
| 3407 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { |
| 3408 | dout("request for non-existent snapshot"); |
| 3409 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); |
| 3410 | result = -ENXIO; |
| 3411 | goto err_rq; |
| 3412 | } |
| 3413 | |
| 3414 | if (offset && length > U64_MAX - offset + 1) { |
| 3415 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, |
| 3416 | length); |
| 3417 | result = -EINVAL; |
| 3418 | goto err_rq; /* Shouldn't happen */ |
| 3419 | } |
| 3420 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3421 | blk_mq_start_request(rq); |
| 3422 | |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3423 | down_read(&rbd_dev->header_rwsem); |
| 3424 | mapping_size = rbd_dev->mapping.size; |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3425 | if (op_type != OBJ_OP_READ) { |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3426 | snapc = rbd_dev->header.snapc; |
| 3427 | ceph_get_snap_context(snapc); |
| 3428 | } |
| 3429 | up_read(&rbd_dev->header_rwsem); |
| 3430 | |
| 3431 | if (offset + length > mapping_size) { |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3432 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3433 | length, mapping_size); |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3434 | result = -EIO; |
| 3435 | goto err_rq; |
| 3436 | } |
| 3437 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3438 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
Josh Durgin | 4e752f0 | 2014-04-08 11:12:11 -0700 | [diff] [blame] | 3439 | snapc); |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3440 | if (!img_request) { |
| 3441 | result = -ENOMEM; |
| 3442 | goto err_rq; |
| 3443 | } |
| 3444 | img_request->rq = rq; |
| 3445 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 3446 | if (op_type == OBJ_OP_DISCARD) |
| 3447 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, |
| 3448 | NULL); |
| 3449 | else |
| 3450 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
| 3451 | rq->bio); |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3452 | if (result) |
| 3453 | goto err_img_request; |
| 3454 | |
| 3455 | result = rbd_img_request_submit(img_request); |
| 3456 | if (result) |
| 3457 | goto err_img_request; |
| 3458 | |
| 3459 | return; |
| 3460 | |
| 3461 | err_img_request: |
| 3462 | rbd_img_request_put(img_request); |
| 3463 | err_rq: |
| 3464 | if (result) |
| 3465 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3466 | obj_op_name(op_type), length, offset, result); |
SF Markus Elfring | e96a650 | 2014-11-02 15:20:59 +0100 | [diff] [blame] | 3467 | ceph_put_snap_context(snapc); |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3468 | err: |
| 3469 | blk_mq_end_request(rq, result); |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3470 | } |
| 3471 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3472 | static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
| 3473 | const struct blk_mq_queue_data *bd) |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3474 | { |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3475 | struct request *rq = bd->rq; |
| 3476 | struct work_struct *work = blk_mq_rq_to_pdu(rq); |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 3477 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3478 | queue_work(rbd_wq, work); |
| 3479 | return BLK_MQ_RQ_QUEUE_OK; |
Alex Elder | bf0d5f50 | 2012-11-22 00:00:08 -0600 | [diff] [blame] | 3480 | } |
| 3481 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3482 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
| 3483 | { |
| 3484 | struct gendisk *disk = rbd_dev->disk; |
| 3485 | |
| 3486 | if (!disk) |
| 3487 | return; |
| 3488 | |
Alex Elder | a0cab92 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 3489 | rbd_dev->disk = NULL; |
| 3490 | if (disk->flags & GENHD_FL_UP) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3491 | del_gendisk(disk); |
Alex Elder | a0cab92 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 3492 | if (disk->queue) |
| 3493 | blk_cleanup_queue(disk->queue); |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3494 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
Alex Elder | a0cab92 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 3495 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3496 | put_disk(disk); |
| 3497 | } |
| 3498 | |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3499 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
| 3500 | const char *object_name, |
Alex Elder | 7097f8d | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3501 | u64 offset, u64 length, void *buf) |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3502 | |
| 3503 | { |
Alex Elder | 2169238 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3504 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3505 | struct rbd_obj_request *obj_request; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3506 | struct page **pages = NULL; |
| 3507 | u32 page_count; |
Alex Elder | 1ceae7e | 2013-02-06 13:11:38 -0600 | [diff] [blame] | 3508 | size_t size; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3509 | int ret; |
| 3510 | |
| 3511 | page_count = (u32) calc_pages_for(offset, length); |
| 3512 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| 3513 | if (IS_ERR(pages)) |
Jan Kara | a8d4205 | 2014-10-22 09:17:24 +0200 | [diff] [blame] | 3514 | return PTR_ERR(pages); |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3515 | |
| 3516 | ret = -ENOMEM; |
| 3517 | obj_request = rbd_obj_request_create(object_name, offset, length, |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 3518 | OBJ_REQUEST_PAGES); |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3519 | if (!obj_request) |
| 3520 | goto out; |
| 3521 | |
| 3522 | obj_request->pages = pages; |
| 3523 | obj_request->page_count = page_count; |
| 3524 | |
Guangliang Zhao | 6d2940c | 2014-03-13 11:21:35 +0800 | [diff] [blame] | 3525 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
Ilya Dryomov | deb236b | 2014-02-25 16:22:27 +0200 | [diff] [blame] | 3526 | obj_request); |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3527 | if (!obj_request->osd_req) |
| 3528 | goto out; |
| 3529 | |
Alex Elder | c99d2d4 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 3530 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
| 3531 | offset, length, 0, 0); |
Alex Elder | 406e2c9 | 2013-04-15 14:50:36 -0500 | [diff] [blame] | 3532 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
Alex Elder | a4ce40a | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3533 | obj_request->pages, |
Alex Elder | 44cd188 | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 3534 | obj_request->length, |
| 3535 | obj_request->offset & ~PAGE_MASK, |
| 3536 | false, false); |
Alex Elder | 9d4df01 | 2013-04-19 15:34:50 -0500 | [diff] [blame] | 3537 | rbd_osd_req_format_read(obj_request); |
Alex Elder | 430c28c | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 3538 | |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3539 | ret = rbd_obj_request_submit(osdc, obj_request); |
| 3540 | if (ret) |
| 3541 | goto out; |
| 3542 | ret = rbd_obj_request_wait(obj_request); |
| 3543 | if (ret) |
| 3544 | goto out; |
| 3545 | |
| 3546 | ret = obj_request->result; |
| 3547 | if (ret < 0) |
| 3548 | goto out; |
Alex Elder | 1ceae7e | 2013-02-06 13:11:38 -0600 | [diff] [blame] | 3549 | |
| 3550 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); |
| 3551 | size = (size_t) obj_request->xferred; |
Alex Elder | 903bb32 | 2013-02-06 13:11:38 -0600 | [diff] [blame] | 3552 | ceph_copy_from_page_vector(pages, buf, 0, size); |
Alex Elder | 7097f8d | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3553 | rbd_assert(size <= (size_t)INT_MAX); |
| 3554 | ret = (int)size; |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3555 | out: |
| 3556 | if (obj_request) |
| 3557 | rbd_obj_request_put(obj_request); |
| 3558 | else |
| 3559 | ceph_release_page_vector(pages, page_count); |
| 3560 | |
| 3561 | return ret; |
| 3562 | } |
| 3563 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3564 | /* |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3565 | * Read the complete header for the given rbd device. On successful |
| 3566 | * return, the rbd_dev->header field will contain up-to-date |
| 3567 | * information about the image. |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3568 | */ |
Alex Elder | 99a41eb | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 3569 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3570 | { |
| 3571 | struct rbd_image_header_ondisk *ondisk = NULL; |
| 3572 | u32 snap_count = 0; |
| 3573 | u64 names_size = 0; |
| 3574 | u32 want_count; |
| 3575 | int ret; |
| 3576 | |
| 3577 | /* |
| 3578 | * The complete header will include an array of its 64-bit |
| 3579 | * snapshot ids, followed by the names of those snapshots as |
| 3580 | * a contiguous block of NUL-terminated strings. Note that |
| 3581 | * the number of snapshots could change by the time we read |
| 3582 | * it in, in which case we re-read it. |
| 3583 | */ |
| 3584 | do { |
| 3585 | size_t size; |
| 3586 | |
| 3587 | kfree(ondisk); |
| 3588 | |
| 3589 | size = sizeof (*ondisk); |
| 3590 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); |
| 3591 | size += names_size; |
| 3592 | ondisk = kmalloc(size, GFP_KERNEL); |
| 3593 | if (!ondisk) |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3594 | return -ENOMEM; |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3595 | |
Alex Elder | 788e2df | 2013-01-17 12:25:27 -0600 | [diff] [blame] | 3596 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | 7097f8d | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3597 | 0, size, ondisk); |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3598 | if (ret < 0) |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3599 | goto out; |
Alex Elder | c0cd10db | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 3600 | if ((size_t)ret < size) { |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3601 | ret = -ENXIO; |
Alex Elder | 06ecc6c | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 3602 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
| 3603 | size, ret); |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3604 | goto out; |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3605 | } |
| 3606 | if (!rbd_dev_ondisk_valid(ondisk)) { |
| 3607 | ret = -ENXIO; |
Alex Elder | 06ecc6c | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 3608 | rbd_warn(rbd_dev, "invalid header"); |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3609 | goto out; |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3610 | } |
| 3611 | |
| 3612 | names_size = le64_to_cpu(ondisk->snap_names_len); |
| 3613 | want_count = snap_count; |
| 3614 | snap_count = le32_to_cpu(ondisk->snap_count); |
| 3615 | } while (snap_count != want_count); |
| 3616 | |
Alex Elder | 662518b | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 3617 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
| 3618 | out: |
Alex Elder | 4156d99 | 2012-08-02 11:29:46 -0500 | [diff] [blame] | 3619 | kfree(ondisk); |
| 3620 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3621 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3622 | } |
| 3623 | |
Alex Elder | 15228ed | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 3624 | /* |
| 3625 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to |
| 3626 | * has disappeared from the (just updated) snapshot context. |
| 3627 | */ |
| 3628 | static void rbd_exists_validate(struct rbd_device *rbd_dev) |
| 3629 | { |
| 3630 | u64 snap_id; |
| 3631 | |
| 3632 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) |
| 3633 | return; |
| 3634 | |
| 3635 | snap_id = rbd_dev->spec->snap_id; |
| 3636 | if (snap_id == CEPH_NOSNAP) |
| 3637 | return; |
| 3638 | |
| 3639 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) |
| 3640 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| 3641 | } |
| 3642 | |
Josh Durgin | 9875201 | 2013-08-29 17:26:31 -0700 | [diff] [blame] | 3643 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
| 3644 | { |
| 3645 | sector_t size; |
| 3646 | bool removing; |
| 3647 | |
| 3648 | /* |
| 3649 | * Don't hold the lock while doing disk operations, |
| 3650 | * or lock ordering will conflict with the bdev mutex via: |
| 3651 | * rbd_add() -> blkdev_get() -> rbd_open() |
| 3652 | */ |
| 3653 | spin_lock_irq(&rbd_dev->lock); |
| 3654 | removing = test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); |
| 3655 | spin_unlock_irq(&rbd_dev->lock); |
| 3656 | /* |
| 3657 | * If the device is being removed, rbd_dev->disk has |
| 3658 | * been destroyed, so don't try to update its size |
| 3659 | */ |
| 3660 | if (!removing) { |
| 3661 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
| 3662 | dout("setting size to %llu sectors", (unsigned long long)size); |
| 3663 | set_capacity(rbd_dev->disk, size); |
| 3664 | revalidate_disk(rbd_dev->disk); |
| 3665 | } |
| 3666 | } |
| 3667 | |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3668 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
Alex Elder | 1fe5e99 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3669 | { |
Alex Elder | e627db0 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 3670 | u64 mapping_size; |
Alex Elder | 1fe5e99 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3671 | int ret; |
| 3672 | |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 3673 | down_write(&rbd_dev->header_rwsem); |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 3674 | mapping_size = rbd_dev->mapping.size; |
Ilya Dryomov | a720ae0 | 2014-07-23 17:11:19 +0400 | [diff] [blame] | 3675 | |
| 3676 | ret = rbd_dev_header_info(rbd_dev); |
Ilya Dryomov | 52bb1f9 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 3677 | if (ret) |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3678 | goto out; |
Alex Elder | 15228ed | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 3679 | |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 3680 | /* |
| 3681 | * If there is a parent, see if it has disappeared due to the |
| 3682 | * mapped image getting flattened. |
| 3683 | */ |
| 3684 | if (rbd_dev->parent) { |
| 3685 | ret = rbd_dev_v2_parent_info(rbd_dev); |
| 3686 | if (ret) |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3687 | goto out; |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 3688 | } |
| 3689 | |
Ilya Dryomov | 5ff1108 | 2014-07-23 17:11:21 +0400 | [diff] [blame] | 3690 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3691 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
Ilya Dryomov | 5ff1108 | 2014-07-23 17:11:21 +0400 | [diff] [blame] | 3692 | } else { |
| 3693 | /* validate mapped snapshot's EXISTS flag */ |
| 3694 | rbd_exists_validate(rbd_dev); |
| 3695 | } |
Alex Elder | 15228ed | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 3696 | |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3697 | out: |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 3698 | up_write(&rbd_dev->header_rwsem); |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3699 | if (!ret && mapping_size != rbd_dev->mapping.size) |
Josh Durgin | 9875201 | 2013-08-29 17:26:31 -0700 | [diff] [blame] | 3700 | rbd_dev_update_size(rbd_dev); |
Alex Elder | 1fe5e99 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3701 | |
Ilya Dryomov | 73e39e4 | 2015-01-08 20:18:22 +0300 | [diff] [blame] | 3702 | return ret; |
Alex Elder | 1fe5e99 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3703 | } |
| 3704 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3705 | static int rbd_init_request(void *data, struct request *rq, |
| 3706 | unsigned int hctx_idx, unsigned int request_idx, |
| 3707 | unsigned int numa_node) |
| 3708 | { |
| 3709 | struct work_struct *work = blk_mq_rq_to_pdu(rq); |
| 3710 | |
| 3711 | INIT_WORK(work, rbd_queue_workfn); |
| 3712 | return 0; |
| 3713 | } |
| 3714 | |
| 3715 | static struct blk_mq_ops rbd_mq_ops = { |
| 3716 | .queue_rq = rbd_queue_rq, |
| 3717 | .map_queue = blk_mq_map_queue, |
| 3718 | .init_request = rbd_init_request, |
| 3719 | }; |
| 3720 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3721 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
| 3722 | { |
| 3723 | struct gendisk *disk; |
| 3724 | struct request_queue *q; |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3725 | u64 segment_size; |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3726 | int err; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3727 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3728 | /* create gendisk info */ |
Ilya Dryomov | 7e513d4 | 2013-12-16 19:26:32 +0200 | [diff] [blame] | 3729 | disk = alloc_disk(single_major ? |
| 3730 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : |
| 3731 | RBD_MINORS_PER_MAJOR); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3732 | if (!disk) |
Alex Elder | 1fcdb8a | 2012-08-29 17:11:06 -0500 | [diff] [blame] | 3733 | return -ENOMEM; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3734 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 3735 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
Alex Elder | de71a29 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 3736 | rbd_dev->dev_id); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3737 | disk->major = rbd_dev->major; |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 3738 | disk->first_minor = rbd_dev->minor; |
Ilya Dryomov | 7e513d4 | 2013-12-16 19:26:32 +0200 | [diff] [blame] | 3739 | if (single_major) |
| 3740 | disk->flags |= GENHD_FL_EXT_DEVT; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3741 | disk->fops = &rbd_bd_ops; |
| 3742 | disk->private_data = rbd_dev; |
| 3743 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3744 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
| 3745 | rbd_dev->tag_set.ops = &rbd_mq_ops; |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 3746 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3747 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 3748 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3749 | rbd_dev->tag_set.nr_hw_queues = 1; |
| 3750 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); |
| 3751 | |
| 3752 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); |
| 3753 | if (err) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3754 | goto out_disk; |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 3755 | |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3756 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
| 3757 | if (IS_ERR(q)) { |
| 3758 | err = PTR_ERR(q); |
| 3759 | goto out_tag_set; |
| 3760 | } |
| 3761 | |
Ilya Dryomov | d8a2c89 | 2015-03-24 16:15:17 +0300 | [diff] [blame] | 3762 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
| 3763 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3764 | |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 3765 | /* set io sizes to object size */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3766 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
| 3767 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); |
Ilya Dryomov | 0d9fde4 | 2015-10-07 16:09:35 +0200 | [diff] [blame] | 3768 | q->limits.max_sectors = queue_max_hw_sectors(q); |
Ilya Dryomov | d3834fe | 2015-06-12 19:19:02 +0300 | [diff] [blame] | 3769 | blk_queue_max_segments(q, segment_size / SECTOR_SIZE); |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3770 | blk_queue_max_segment_size(q, segment_size); |
| 3771 | blk_queue_io_min(q, segment_size); |
| 3772 | blk_queue_io_opt(q, segment_size); |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 3773 | |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 3774 | /* enable the discard support */ |
| 3775 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| 3776 | q->limits.discard_granularity = segment_size; |
| 3777 | q->limits.discard_alignment = segment_size; |
Jens Axboe | 2bb4cd5 | 2015-07-14 08:15:12 -0600 | [diff] [blame] | 3778 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
Josh Durgin | b76f823 | 2014-04-07 16:52:03 -0700 | [diff] [blame] | 3779 | q->limits.discard_zeroes_data = 1; |
Guangliang Zhao | 90e98c5 | 2014-04-01 22:22:16 +0800 | [diff] [blame] | 3780 | |
Ronny Hegewald | bae818e | 2015-10-15 18:50:46 +0000 | [diff] [blame] | 3781 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
| 3782 | q->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES; |
| 3783 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3784 | disk->queue = q; |
| 3785 | |
| 3786 | q->queuedata = rbd_dev; |
| 3787 | |
| 3788 | rbd_dev->disk = disk; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3789 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3790 | return 0; |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3791 | out_tag_set: |
| 3792 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3793 | out_disk: |
| 3794 | put_disk(disk); |
Christoph Hellwig | 7ad18af | 2015-01-13 17:20:04 +0100 | [diff] [blame] | 3795 | return err; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3796 | } |
| 3797 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3798 | /* |
| 3799 | sysfs |
| 3800 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3801 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3802 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
| 3803 | { |
| 3804 | return container_of(dev, struct rbd_device, dev); |
| 3805 | } |
| 3806 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3807 | static ssize_t rbd_size_show(struct device *dev, |
| 3808 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3809 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3810 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3811 | |
Alex Elder | fc71d83 | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 3812 | return sprintf(buf, "%llu\n", |
| 3813 | (unsigned long long)rbd_dev->mapping.size); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3814 | } |
| 3815 | |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 3816 | /* |
| 3817 | * Note this shows the features for whatever's mapped, which is not |
| 3818 | * necessarily the base image. |
| 3819 | */ |
| 3820 | static ssize_t rbd_features_show(struct device *dev, |
| 3821 | struct device_attribute *attr, char *buf) |
| 3822 | { |
| 3823 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 3824 | |
| 3825 | return sprintf(buf, "0x%016llx\n", |
Alex Elder | fc71d83 | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 3826 | (unsigned long long)rbd_dev->mapping.features); |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 3827 | } |
| 3828 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3829 | static ssize_t rbd_major_show(struct device *dev, |
| 3830 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3831 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3832 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3833 | |
Alex Elder | fc71d83 | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 3834 | if (rbd_dev->major) |
| 3835 | return sprintf(buf, "%d\n", rbd_dev->major); |
| 3836 | |
| 3837 | return sprintf(buf, "(none)\n"); |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 3838 | } |
Alex Elder | fc71d83 | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 3839 | |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 3840 | static ssize_t rbd_minor_show(struct device *dev, |
| 3841 | struct device_attribute *attr, char *buf) |
| 3842 | { |
| 3843 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 3844 | |
| 3845 | return sprintf(buf, "%d\n", rbd_dev->minor); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3846 | } |
| 3847 | |
| 3848 | static ssize_t rbd_client_id_show(struct device *dev, |
| 3849 | struct device_attribute *attr, char *buf) |
| 3850 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3851 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3852 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 3853 | return sprintf(buf, "client%lld\n", |
| 3854 | ceph_client_id(rbd_dev->rbd_client->client)); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3855 | } |
| 3856 | |
| 3857 | static ssize_t rbd_pool_show(struct device *dev, |
| 3858 | struct device_attribute *attr, char *buf) |
| 3859 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3860 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3861 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 3862 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3863 | } |
| 3864 | |
Alex Elder | 9bb2f33 | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 3865 | static ssize_t rbd_pool_id_show(struct device *dev, |
| 3866 | struct device_attribute *attr, char *buf) |
| 3867 | { |
| 3868 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 3869 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 3870 | return sprintf(buf, "%llu\n", |
Alex Elder | fc71d83 | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 3871 | (unsigned long long) rbd_dev->spec->pool_id); |
Alex Elder | 9bb2f33 | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 3872 | } |
| 3873 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3874 | static ssize_t rbd_name_show(struct device *dev, |
| 3875 | struct device_attribute *attr, char *buf) |
| 3876 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3877 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3878 | |
Alex Elder | a92ffdf | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 3879 | if (rbd_dev->spec->image_name) |
| 3880 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); |
| 3881 | |
| 3882 | return sprintf(buf, "(unknown)\n"); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3883 | } |
| 3884 | |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 3885 | static ssize_t rbd_image_id_show(struct device *dev, |
| 3886 | struct device_attribute *attr, char *buf) |
| 3887 | { |
| 3888 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 3889 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 3890 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 3891 | } |
| 3892 | |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 3893 | /* |
| 3894 | * Shows the name of the currently-mapped snapshot (or |
| 3895 | * RBD_SNAP_HEAD_NAME for the base image). |
| 3896 | */ |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3897 | static ssize_t rbd_snap_show(struct device *dev, |
| 3898 | struct device_attribute *attr, |
| 3899 | char *buf) |
| 3900 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3901 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3902 | |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 3903 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3904 | } |
| 3905 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3906 | /* |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3907 | * For a v2 image, shows the chain of parent images, separated by empty |
| 3908 | * lines. For v1 images or if there is no parent, shows "(no parent |
| 3909 | * image)". |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3910 | */ |
| 3911 | static ssize_t rbd_parent_show(struct device *dev, |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3912 | struct device_attribute *attr, |
| 3913 | char *buf) |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3914 | { |
| 3915 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3916 | ssize_t count = 0; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3917 | |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3918 | if (!rbd_dev->parent) |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3919 | return sprintf(buf, "(no parent image)\n"); |
| 3920 | |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3921 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
| 3922 | struct rbd_spec *spec = rbd_dev->parent_spec; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3923 | |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3924 | count += sprintf(&buf[count], "%s" |
| 3925 | "pool_id %llu\npool_name %s\n" |
| 3926 | "image_id %s\nimage_name %s\n" |
| 3927 | "snap_id %llu\nsnap_name %s\n" |
| 3928 | "overlap %llu\n", |
| 3929 | !count ? "" : "\n", /* first? */ |
| 3930 | spec->pool_id, spec->pool_name, |
| 3931 | spec->image_id, spec->image_name ?: "(unknown)", |
| 3932 | spec->snap_id, spec->snap_name, |
| 3933 | rbd_dev->parent_overlap); |
| 3934 | } |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3935 | |
Ilya Dryomov | ff96128 | 2014-07-22 21:53:07 +0400 | [diff] [blame] | 3936 | return count; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3937 | } |
| 3938 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3939 | static ssize_t rbd_image_refresh(struct device *dev, |
| 3940 | struct device_attribute *attr, |
| 3941 | const char *buf, |
| 3942 | size_t size) |
| 3943 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 3944 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Alex Elder | b813623 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3945 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3946 | |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 3947 | ret = rbd_dev_refresh(rbd_dev); |
Alex Elder | e627db0 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 3948 | if (ret) |
Ilya Dryomov | 52bb1f9 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 3949 | return ret; |
Alex Elder | b813623 | 2012-07-25 09:32:41 -0500 | [diff] [blame] | 3950 | |
Ilya Dryomov | 52bb1f9 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 3951 | return size; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3952 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 3953 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3954 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 3955 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3956 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 3957 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3958 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
| 3959 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
Alex Elder | 9bb2f33 | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 3960 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3961 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 3962 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3963 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
| 3964 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3965 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3966 | |
| 3967 | static struct attribute *rbd_attrs[] = { |
| 3968 | &dev_attr_size.attr, |
Alex Elder | 34b1318 | 2012-07-13 20:35:12 -0500 | [diff] [blame] | 3969 | &dev_attr_features.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3970 | &dev_attr_major.attr, |
Ilya Dryomov | dd82fff | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 3971 | &dev_attr_minor.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3972 | &dev_attr_client_id.attr, |
| 3973 | &dev_attr_pool.attr, |
Alex Elder | 9bb2f33 | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 3974 | &dev_attr_pool_id.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3975 | &dev_attr_name.attr, |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 3976 | &dev_attr_image_id.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3977 | &dev_attr_current_snap.attr, |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 3978 | &dev_attr_parent.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3979 | &dev_attr_refresh.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3980 | NULL |
| 3981 | }; |
| 3982 | |
| 3983 | static struct attribute_group rbd_attr_group = { |
| 3984 | .attrs = rbd_attrs, |
| 3985 | }; |
| 3986 | |
| 3987 | static const struct attribute_group *rbd_attr_groups[] = { |
| 3988 | &rbd_attr_group, |
| 3989 | NULL |
| 3990 | }; |
| 3991 | |
Ilya Dryomov | 6cac469 | 2015-10-16 20:11:25 +0200 | [diff] [blame] | 3992 | static void rbd_dev_release(struct device *dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3993 | |
| 3994 | static struct device_type rbd_device_type = { |
| 3995 | .name = "rbd", |
| 3996 | .groups = rbd_attr_groups, |
Ilya Dryomov | 6cac469 | 2015-10-16 20:11:25 +0200 | [diff] [blame] | 3997 | .release = rbd_dev_release, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 3998 | }; |
| 3999 | |
Alex Elder | 8b8fb99 | 2012-10-26 17:25:24 -0500 | [diff] [blame] | 4000 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
| 4001 | { |
| 4002 | kref_get(&spec->kref); |
| 4003 | |
| 4004 | return spec; |
| 4005 | } |
| 4006 | |
| 4007 | static void rbd_spec_free(struct kref *kref); |
| 4008 | static void rbd_spec_put(struct rbd_spec *spec) |
| 4009 | { |
| 4010 | if (spec) |
| 4011 | kref_put(&spec->kref, rbd_spec_free); |
| 4012 | } |
| 4013 | |
| 4014 | static struct rbd_spec *rbd_spec_alloc(void) |
| 4015 | { |
| 4016 | struct rbd_spec *spec; |
| 4017 | |
| 4018 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); |
| 4019 | if (!spec) |
| 4020 | return NULL; |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4021 | |
| 4022 | spec->pool_id = CEPH_NOPOOL; |
| 4023 | spec->snap_id = CEPH_NOSNAP; |
Alex Elder | 8b8fb99 | 2012-10-26 17:25:24 -0500 | [diff] [blame] | 4024 | kref_init(&spec->kref); |
| 4025 | |
Alex Elder | 8b8fb99 | 2012-10-26 17:25:24 -0500 | [diff] [blame] | 4026 | return spec; |
| 4027 | } |
| 4028 | |
| 4029 | static void rbd_spec_free(struct kref *kref) |
| 4030 | { |
| 4031 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); |
| 4032 | |
| 4033 | kfree(spec->pool_name); |
| 4034 | kfree(spec->image_id); |
| 4035 | kfree(spec->image_name); |
| 4036 | kfree(spec->snap_name); |
| 4037 | kfree(spec); |
| 4038 | } |
| 4039 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 4040 | static void rbd_dev_release(struct device *dev) |
| 4041 | { |
| 4042 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 4043 | bool need_put = !!rbd_dev->opts; |
| 4044 | |
| 4045 | rbd_put_client(rbd_dev->rbd_client); |
| 4046 | rbd_spec_put(rbd_dev->spec); |
| 4047 | kfree(rbd_dev->opts); |
| 4048 | kfree(rbd_dev); |
| 4049 | |
| 4050 | /* |
| 4051 | * This is racy, but way better than putting module outside of |
| 4052 | * the release callback. The race window is pretty small, so |
| 4053 | * doing something similar to dm (dm-builtin.c) is overkill. |
| 4054 | */ |
| 4055 | if (need_put) |
| 4056 | module_put(THIS_MODULE); |
| 4057 | } |
| 4058 | |
Alex Elder | cc344fa | 2013-02-19 12:25:56 -0600 | [diff] [blame] | 4059 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 4060 | struct rbd_spec *spec, |
| 4061 | struct rbd_options *opts) |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4062 | { |
| 4063 | struct rbd_device *rbd_dev; |
| 4064 | |
| 4065 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); |
| 4066 | if (!rbd_dev) |
| 4067 | return NULL; |
| 4068 | |
| 4069 | spin_lock_init(&rbd_dev->lock); |
Alex Elder | 6d29290 | 2013-01-14 12:43:31 -0600 | [diff] [blame] | 4070 | rbd_dev->flags = 0; |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 4071 | atomic_set(&rbd_dev->parent_ref, 0); |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4072 | INIT_LIST_HEAD(&rbd_dev->node); |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4073 | init_rwsem(&rbd_dev->header_rwsem); |
| 4074 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 4075 | rbd_dev->dev.bus = &rbd_bus_type; |
| 4076 | rbd_dev->dev.type = &rbd_device_type; |
| 4077 | rbd_dev->dev.parent = &rbd_root_dev; |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 4078 | device_initialize(&rbd_dev->dev); |
| 4079 | |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4080 | rbd_dev->rbd_client = rbdc; |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 4081 | rbd_dev->spec = spec; |
| 4082 | rbd_dev->opts = opts; |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4083 | |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 4084 | /* Initialize the layout used for all rbd requests */ |
| 4085 | |
| 4086 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| 4087 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); |
| 4088 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| 4089 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); |
| 4090 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 4091 | /* |
| 4092 | * If this is a mapping rbd_dev (as opposed to a parent one), |
| 4093 | * pin our module. We have a ref from do_rbd_add(), so use |
| 4094 | * __module_get(). |
| 4095 | */ |
| 4096 | if (rbd_dev->opts) |
| 4097 | __module_get(THIS_MODULE); |
| 4098 | |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4099 | return rbd_dev; |
| 4100 | } |
| 4101 | |
| 4102 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
| 4103 | { |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 4104 | if (rbd_dev) |
| 4105 | put_device(&rbd_dev->dev); |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4106 | } |
| 4107 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 4108 | /* |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4109 | * Get the size and object order for an image snapshot, or if |
| 4110 | * snap_id is CEPH_NOSNAP, gets this information for the base |
| 4111 | * image. |
| 4112 | */ |
| 4113 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 4114 | u8 *order, u64 *snap_size) |
| 4115 | { |
| 4116 | __le64 snapid = cpu_to_le64(snap_id); |
| 4117 | int ret; |
| 4118 | struct { |
| 4119 | u8 order; |
| 4120 | __le64 size; |
| 4121 | } __attribute__ ((packed)) size_buf = { 0 }; |
| 4122 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4123 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4124 | "rbd", "get_size", |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4125 | &snapid, sizeof (snapid), |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4126 | &size_buf, sizeof (size_buf)); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4127 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4128 | if (ret < 0) |
| 4129 | return ret; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4130 | if (ret < sizeof (size_buf)) |
| 4131 | return -ERANGE; |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4132 | |
Josh Durgin | c354557 | 2013-08-28 17:08:10 -0700 | [diff] [blame] | 4133 | if (order) { |
Alex Elder | c86f86e | 2013-04-25 15:09:41 -0500 | [diff] [blame] | 4134 | *order = size_buf.order; |
Josh Durgin | c354557 | 2013-08-28 17:08:10 -0700 | [diff] [blame] | 4135 | dout(" order %u", (unsigned int)*order); |
| 4136 | } |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4137 | *snap_size = le64_to_cpu(size_buf.size); |
| 4138 | |
Josh Durgin | c354557 | 2013-08-28 17:08:10 -0700 | [diff] [blame] | 4139 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
| 4140 | (unsigned long long)snap_id, |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4141 | (unsigned long long)*snap_size); |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4142 | |
| 4143 | return 0; |
| 4144 | } |
| 4145 | |
| 4146 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) |
| 4147 | { |
| 4148 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, |
| 4149 | &rbd_dev->header.obj_order, |
| 4150 | &rbd_dev->header.image_size); |
| 4151 | } |
| 4152 | |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4153 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
| 4154 | { |
| 4155 | void *reply_buf; |
| 4156 | int ret; |
| 4157 | void *p; |
| 4158 | |
| 4159 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); |
| 4160 | if (!reply_buf) |
| 4161 | return -ENOMEM; |
| 4162 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4163 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4164 | "rbd", "get_object_prefix", NULL, 0, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4165 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4166 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4167 | if (ret < 0) |
| 4168 | goto out; |
| 4169 | |
| 4170 | p = reply_buf; |
| 4171 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4172 | p + ret, NULL, GFP_NOIO); |
| 4173 | ret = 0; |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4174 | |
| 4175 | if (IS_ERR(rbd_dev->header.object_prefix)) { |
| 4176 | ret = PTR_ERR(rbd_dev->header.object_prefix); |
| 4177 | rbd_dev->header.object_prefix = NULL; |
| 4178 | } else { |
| 4179 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); |
| 4180 | } |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4181 | out: |
| 4182 | kfree(reply_buf); |
| 4183 | |
| 4184 | return ret; |
| 4185 | } |
| 4186 | |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4187 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 4188 | u64 *snap_features) |
| 4189 | { |
| 4190 | __le64 snapid = cpu_to_le64(snap_id); |
| 4191 | struct { |
| 4192 | __le64 features; |
| 4193 | __le64 incompat; |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4194 | } __attribute__ ((packed)) features_buf = { 0 }; |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 4195 | u64 incompat; |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4196 | int ret; |
| 4197 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4198 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4199 | "rbd", "get_features", |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4200 | &snapid, sizeof (snapid), |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4201 | &features_buf, sizeof (features_buf)); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4202 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4203 | if (ret < 0) |
| 4204 | return ret; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4205 | if (ret < sizeof (features_buf)) |
| 4206 | return -ERANGE; |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 4207 | |
| 4208 | incompat = le64_to_cpu(features_buf.incompat); |
Alex Elder | 5cbf6f12 | 2013-04-11 09:29:48 -0500 | [diff] [blame] | 4209 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
Alex Elder | b8f5c6e | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 4210 | return -ENXIO; |
Alex Elder | d889140 | 2012-10-09 13:50:17 -0700 | [diff] [blame] | 4211 | |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4212 | *snap_features = le64_to_cpu(features_buf.features); |
| 4213 | |
| 4214 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4215 | (unsigned long long)snap_id, |
| 4216 | (unsigned long long)*snap_features, |
| 4217 | (unsigned long long)le64_to_cpu(features_buf.incompat)); |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4218 | |
| 4219 | return 0; |
| 4220 | } |
| 4221 | |
| 4222 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) |
| 4223 | { |
| 4224 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, |
| 4225 | &rbd_dev->header.features); |
| 4226 | } |
| 4227 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4228 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
| 4229 | { |
| 4230 | struct rbd_spec *parent_spec; |
| 4231 | size_t size; |
| 4232 | void *reply_buf = NULL; |
| 4233 | __le64 snapid; |
| 4234 | void *p; |
| 4235 | void *end; |
Alex Elder | 642a253 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4236 | u64 pool_id; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4237 | char *image_id; |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4238 | u64 snap_id; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4239 | u64 overlap; |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4240 | int ret; |
| 4241 | |
| 4242 | parent_spec = rbd_spec_alloc(); |
| 4243 | if (!parent_spec) |
| 4244 | return -ENOMEM; |
| 4245 | |
| 4246 | size = sizeof (__le64) + /* pool_id */ |
| 4247 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ |
| 4248 | sizeof (__le64) + /* snap_id */ |
| 4249 | sizeof (__le64); /* overlap */ |
| 4250 | reply_buf = kmalloc(size, GFP_KERNEL); |
| 4251 | if (!reply_buf) { |
| 4252 | ret = -ENOMEM; |
| 4253 | goto out_err; |
| 4254 | } |
| 4255 | |
Ilya Dryomov | 4d9b67c | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 4256 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4257 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4258 | "rbd", "get_parent", |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4259 | &snapid, sizeof (snapid), |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4260 | reply_buf, size); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4261 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4262 | if (ret < 0) |
| 4263 | goto out_err; |
| 4264 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4265 | p = reply_buf; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4266 | end = reply_buf + ret; |
| 4267 | ret = -ERANGE; |
Alex Elder | 642a253 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4268 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
Alex Elder | 392a9da | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4269 | if (pool_id == CEPH_NOPOOL) { |
| 4270 | /* |
| 4271 | * Either the parent never existed, or we have |
| 4272 | * record of it but the image got flattened so it no |
| 4273 | * longer has a parent. When the parent of a |
| 4274 | * layered image disappears we immediately set the |
| 4275 | * overlap to 0. The effect of this is that all new |
| 4276 | * requests will be treated as if the image had no |
| 4277 | * parent. |
| 4278 | */ |
| 4279 | if (rbd_dev->parent_overlap) { |
| 4280 | rbd_dev->parent_overlap = 0; |
Alex Elder | 392a9da | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4281 | rbd_dev_parent_put(rbd_dev); |
| 4282 | pr_info("%s: clone image has been flattened\n", |
| 4283 | rbd_dev->disk->disk_name); |
| 4284 | } |
| 4285 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4286 | goto out; /* No parent? No problem. */ |
Alex Elder | 392a9da | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4287 | } |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4288 | |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 4289 | /* The ceph file layout needs to fit pool id in 32 bits */ |
| 4290 | |
| 4291 | ret = -EIO; |
Alex Elder | 642a253 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4292 | if (pool_id > (u64)U32_MAX) { |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 4293 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
Alex Elder | 642a253 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4294 | (unsigned long long)pool_id, U32_MAX); |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4295 | goto out_err; |
Alex Elder | c0cd10db | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4296 | } |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 4297 | |
Alex Elder | 979ed48 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 4298 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4299 | if (IS_ERR(image_id)) { |
| 4300 | ret = PTR_ERR(image_id); |
| 4301 | goto out_err; |
| 4302 | } |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4303 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4304 | ceph_decode_64_safe(&p, end, overlap, out_err); |
| 4305 | |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4306 | /* |
| 4307 | * The parent won't change (except when the clone is |
| 4308 | * flattened, already handled that). So we only need to |
| 4309 | * record the parent spec we have not already done so. |
| 4310 | */ |
| 4311 | if (!rbd_dev->parent_spec) { |
| 4312 | parent_spec->pool_id = pool_id; |
| 4313 | parent_spec->image_id = image_id; |
| 4314 | parent_spec->snap_id = snap_id; |
Alex Elder | 70cf49c | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4315 | rbd_dev->parent_spec = parent_spec; |
| 4316 | parent_spec = NULL; /* rbd_dev now owns this */ |
Ilya Dryomov | fbba11b | 2014-06-27 21:46:33 +0400 | [diff] [blame] | 4317 | } else { |
| 4318 | kfree(image_id); |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4319 | } |
| 4320 | |
| 4321 | /* |
Ilya Dryomov | cf32bd9 | 2015-01-19 22:57:39 +0300 | [diff] [blame] | 4322 | * We always update the parent overlap. If it's zero we issue |
| 4323 | * a warning, as we will proceed as if there was no parent. |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4324 | */ |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4325 | if (!overlap) { |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4326 | if (parent_spec) { |
Ilya Dryomov | cf32bd9 | 2015-01-19 22:57:39 +0300 | [diff] [blame] | 4327 | /* refresh, careful to warn just once */ |
| 4328 | if (rbd_dev->parent_overlap) |
| 4329 | rbd_warn(rbd_dev, |
| 4330 | "clone now standalone (overlap became 0)"); |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4331 | } else { |
Ilya Dryomov | cf32bd9 | 2015-01-19 22:57:39 +0300 | [diff] [blame] | 4332 | /* initial probe */ |
| 4333 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); |
Alex Elder | 3b5cf2a | 2013-05-29 11:18:59 -0500 | [diff] [blame] | 4334 | } |
Alex Elder | 70cf49c | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 4335 | } |
Ilya Dryomov | cf32bd9 | 2015-01-19 22:57:39 +0300 | [diff] [blame] | 4336 | rbd_dev->parent_overlap = overlap; |
| 4337 | |
Alex Elder | 86b00e0 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4338 | out: |
| 4339 | ret = 0; |
| 4340 | out_err: |
| 4341 | kfree(reply_buf); |
| 4342 | rbd_spec_put(parent_spec); |
| 4343 | |
| 4344 | return ret; |
| 4345 | } |
| 4346 | |
Alex Elder | cc070d5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4347 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
| 4348 | { |
| 4349 | struct { |
| 4350 | __le64 stripe_unit; |
| 4351 | __le64 stripe_count; |
| 4352 | } __attribute__ ((packed)) striping_info_buf = { 0 }; |
| 4353 | size_t size = sizeof (striping_info_buf); |
| 4354 | void *p; |
| 4355 | u64 obj_size; |
| 4356 | u64 stripe_unit; |
| 4357 | u64 stripe_count; |
| 4358 | int ret; |
| 4359 | |
| 4360 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
| 4361 | "rbd", "get_stripe_unit_count", NULL, 0, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4362 | (char *)&striping_info_buf, size); |
Alex Elder | cc070d5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4363 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 4364 | if (ret < 0) |
| 4365 | return ret; |
| 4366 | if (ret < size) |
| 4367 | return -ERANGE; |
| 4368 | |
| 4369 | /* |
| 4370 | * We don't actually support the "fancy striping" feature |
| 4371 | * (STRIPINGV2) yet, but if the striping sizes are the |
| 4372 | * defaults the behavior is the same as before. So find |
| 4373 | * out, and only fail if the image has non-default values. |
| 4374 | */ |
| 4375 | ret = -EINVAL; |
| 4376 | obj_size = (u64)1 << rbd_dev->header.obj_order; |
| 4377 | p = &striping_info_buf; |
| 4378 | stripe_unit = ceph_decode_64(&p); |
| 4379 | if (stripe_unit != obj_size) { |
| 4380 | rbd_warn(rbd_dev, "unsupported stripe unit " |
| 4381 | "(got %llu want %llu)", |
| 4382 | stripe_unit, obj_size); |
| 4383 | return -EINVAL; |
| 4384 | } |
| 4385 | stripe_count = ceph_decode_64(&p); |
| 4386 | if (stripe_count != 1) { |
| 4387 | rbd_warn(rbd_dev, "unsupported stripe count " |
| 4388 | "(got %llu want 1)", stripe_count); |
| 4389 | return -EINVAL; |
| 4390 | } |
Alex Elder | 500d0c0 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4391 | rbd_dev->header.stripe_unit = stripe_unit; |
| 4392 | rbd_dev->header.stripe_count = stripe_count; |
Alex Elder | cc070d5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4393 | |
| 4394 | return 0; |
| 4395 | } |
| 4396 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4397 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
| 4398 | { |
| 4399 | size_t image_id_size; |
| 4400 | char *image_id; |
| 4401 | void *p; |
| 4402 | void *end; |
| 4403 | size_t size; |
| 4404 | void *reply_buf = NULL; |
| 4405 | size_t len = 0; |
| 4406 | char *image_name = NULL; |
| 4407 | int ret; |
| 4408 | |
| 4409 | rbd_assert(!rbd_dev->spec->image_name); |
| 4410 | |
Alex Elder | 69e7a02 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 4411 | len = strlen(rbd_dev->spec->image_id); |
| 4412 | image_id_size = sizeof (__le32) + len; |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4413 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
| 4414 | if (!image_id) |
| 4415 | return NULL; |
| 4416 | |
| 4417 | p = image_id; |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4418 | end = image_id + image_id_size; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4419 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4420 | |
| 4421 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; |
| 4422 | reply_buf = kmalloc(size, GFP_KERNEL); |
| 4423 | if (!reply_buf) |
| 4424 | goto out; |
| 4425 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4426 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4427 | "rbd", "dir_get_name", |
| 4428 | image_id, image_id_size, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4429 | reply_buf, size); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4430 | if (ret < 0) |
| 4431 | goto out; |
| 4432 | p = reply_buf; |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4433 | end = reply_buf + ret; |
| 4434 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4435 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
| 4436 | if (IS_ERR(image_name)) |
| 4437 | image_name = NULL; |
| 4438 | else |
| 4439 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); |
| 4440 | out: |
| 4441 | kfree(reply_buf); |
| 4442 | kfree(image_id); |
| 4443 | |
| 4444 | return image_name; |
| 4445 | } |
| 4446 | |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4447 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 4448 | { |
| 4449 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| 4450 | const char *snap_name; |
| 4451 | u32 which = 0; |
| 4452 | |
| 4453 | /* Skip over names until we find the one we are looking for */ |
| 4454 | |
| 4455 | snap_name = rbd_dev->header.snap_names; |
| 4456 | while (which < snapc->num_snaps) { |
| 4457 | if (!strcmp(name, snap_name)) |
| 4458 | return snapc->snaps[which]; |
| 4459 | snap_name += strlen(snap_name) + 1; |
| 4460 | which++; |
| 4461 | } |
| 4462 | return CEPH_NOSNAP; |
| 4463 | } |
| 4464 | |
| 4465 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 4466 | { |
| 4467 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| 4468 | u32 which; |
| 4469 | bool found = false; |
| 4470 | u64 snap_id; |
| 4471 | |
| 4472 | for (which = 0; !found && which < snapc->num_snaps; which++) { |
| 4473 | const char *snap_name; |
| 4474 | |
| 4475 | snap_id = snapc->snaps[which]; |
| 4476 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); |
Josh Durgin | efadc98 | 2013-08-29 19:16:42 -0700 | [diff] [blame] | 4477 | if (IS_ERR(snap_name)) { |
| 4478 | /* ignore no-longer existing snapshots */ |
| 4479 | if (PTR_ERR(snap_name) == -ENOENT) |
| 4480 | continue; |
| 4481 | else |
| 4482 | break; |
| 4483 | } |
Alex Elder | 2ad3d71 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4484 | found = !strcmp(name, snap_name); |
| 4485 | kfree(snap_name); |
| 4486 | } |
| 4487 | return found ? snap_id : CEPH_NOSNAP; |
| 4488 | } |
| 4489 | |
| 4490 | /* |
| 4491 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if |
| 4492 | * no snapshot by that name is found, or if an error occurs. |
| 4493 | */ |
| 4494 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 4495 | { |
| 4496 | if (rbd_dev->image_format == 1) |
| 4497 | return rbd_v1_snap_id_by_name(rbd_dev, name); |
| 4498 | |
| 4499 | return rbd_v2_snap_id_by_name(rbd_dev, name); |
| 4500 | } |
| 4501 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4502 | /* |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4503 | * An image being mapped will have everything but the snap id. |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4504 | */ |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4505 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) |
| 4506 | { |
| 4507 | struct rbd_spec *spec = rbd_dev->spec; |
| 4508 | |
| 4509 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); |
| 4510 | rbd_assert(spec->image_id && spec->image_name); |
| 4511 | rbd_assert(spec->snap_name); |
| 4512 | |
| 4513 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { |
| 4514 | u64 snap_id; |
| 4515 | |
| 4516 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
| 4517 | if (snap_id == CEPH_NOSNAP) |
| 4518 | return -ENOENT; |
| 4519 | |
| 4520 | spec->snap_id = snap_id; |
| 4521 | } else { |
| 4522 | spec->snap_id = CEPH_NOSNAP; |
| 4523 | } |
| 4524 | |
| 4525 | return 0; |
| 4526 | } |
| 4527 | |
| 4528 | /* |
| 4529 | * A parent image will have all ids but none of the names. |
| 4530 | * |
| 4531 | * All names in an rbd spec are dynamically allocated. It's OK if we |
| 4532 | * can't figure out the name for an image id. |
| 4533 | */ |
| 4534 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4535 | { |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4536 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4537 | struct rbd_spec *spec = rbd_dev->spec; |
| 4538 | const char *pool_name; |
| 4539 | const char *image_name; |
| 4540 | const char *snap_name; |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4541 | int ret; |
| 4542 | |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4543 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
| 4544 | rbd_assert(spec->image_id); |
| 4545 | rbd_assert(spec->snap_id != CEPH_NOSNAP); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4546 | |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4547 | /* Get the pool name; we have to make our own copy of this */ |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4548 | |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4549 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
| 4550 | if (!pool_name) { |
| 4551 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); |
Alex Elder | 935dc89 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4552 | return -EIO; |
| 4553 | } |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4554 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
| 4555 | if (!pool_name) |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4556 | return -ENOMEM; |
| 4557 | |
| 4558 | /* Fetch the image name; tolerate failure here */ |
| 4559 | |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4560 | image_name = rbd_dev_image_name(rbd_dev); |
| 4561 | if (!image_name) |
Alex Elder | 06ecc6c | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4562 | rbd_warn(rbd_dev, "unable to get image name"); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4563 | |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4564 | /* Fetch the snapshot name */ |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4565 | |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4566 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
Josh Durgin | da6a6b6 | 2013-09-04 17:57:31 -0700 | [diff] [blame] | 4567 | if (IS_ERR(snap_name)) { |
| 4568 | ret = PTR_ERR(snap_name); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4569 | goto out_err; |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4570 | } |
| 4571 | |
| 4572 | spec->pool_name = pool_name; |
| 4573 | spec->image_name = image_name; |
| 4574 | spec->snap_name = snap_name; |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4575 | |
| 4576 | return 0; |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 4577 | |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4578 | out_err: |
Alex Elder | 2e9f7f1 | 2013-04-26 09:43:48 -0500 | [diff] [blame] | 4579 | kfree(image_name); |
| 4580 | kfree(pool_name); |
Alex Elder | 9e15b77 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 4581 | return ret; |
| 4582 | } |
| 4583 | |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4584 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4585 | { |
| 4586 | size_t size; |
| 4587 | int ret; |
| 4588 | void *reply_buf; |
| 4589 | void *p; |
| 4590 | void *end; |
| 4591 | u64 seq; |
| 4592 | u32 snap_count; |
| 4593 | struct ceph_snap_context *snapc; |
| 4594 | u32 i; |
| 4595 | |
| 4596 | /* |
| 4597 | * We'll need room for the seq value (maximum snapshot id), |
| 4598 | * snapshot count, and array of that many snapshot ids. |
| 4599 | * For now we have a fixed upper limit on the number we're |
| 4600 | * prepared to receive. |
| 4601 | */ |
| 4602 | size = sizeof (__le64) + sizeof (__le32) + |
| 4603 | RBD_MAX_SNAP_COUNT * sizeof (__le64); |
| 4604 | reply_buf = kzalloc(size, GFP_KERNEL); |
| 4605 | if (!reply_buf) |
| 4606 | return -ENOMEM; |
| 4607 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4608 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4609 | "rbd", "get_snapcontext", NULL, 0, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4610 | reply_buf, size); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4611 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4612 | if (ret < 0) |
| 4613 | goto out; |
| 4614 | |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4615 | p = reply_buf; |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4616 | end = reply_buf + ret; |
| 4617 | ret = -ERANGE; |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4618 | ceph_decode_64_safe(&p, end, seq, out); |
| 4619 | ceph_decode_32_safe(&p, end, snap_count, out); |
| 4620 | |
| 4621 | /* |
| 4622 | * Make sure the reported number of snapshot ids wouldn't go |
| 4623 | * beyond the end of our buffer. But before checking that, |
| 4624 | * make sure the computed size of the snapshot context we |
| 4625 | * allocate is representable in a size_t. |
| 4626 | */ |
| 4627 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) |
| 4628 | / sizeof (u64)) { |
| 4629 | ret = -EINVAL; |
| 4630 | goto out; |
| 4631 | } |
| 4632 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) |
| 4633 | goto out; |
Alex Elder | 468521c | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4634 | ret = 0; |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4635 | |
Alex Elder | 812164f8 | 2013-04-30 00:44:32 -0500 | [diff] [blame] | 4636 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4637 | if (!snapc) { |
| 4638 | ret = -ENOMEM; |
| 4639 | goto out; |
| 4640 | } |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4641 | snapc->seq = seq; |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4642 | for (i = 0; i < snap_count; i++) |
| 4643 | snapc->snaps[i] = ceph_decode_64(&p); |
| 4644 | |
Alex Elder | 49ece55 | 2013-05-06 08:37:00 -0500 | [diff] [blame] | 4645 | ceph_put_snap_context(rbd_dev->header.snapc); |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4646 | rbd_dev->header.snapc = snapc; |
| 4647 | |
| 4648 | dout(" snap context seq = %llu, snap_count = %u\n", |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4649 | (unsigned long long)seq, (unsigned int)snap_count); |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4650 | out: |
| 4651 | kfree(reply_buf); |
| 4652 | |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 4653 | return ret; |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4654 | } |
| 4655 | |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4656 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| 4657 | u64 snap_id) |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4658 | { |
| 4659 | size_t size; |
| 4660 | void *reply_buf; |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4661 | __le64 snapid; |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4662 | int ret; |
| 4663 | void *p; |
| 4664 | void *end; |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4665 | char *snap_name; |
| 4666 | |
| 4667 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; |
| 4668 | reply_buf = kmalloc(size, GFP_KERNEL); |
| 4669 | if (!reply_buf) |
| 4670 | return ERR_PTR(-ENOMEM); |
| 4671 | |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4672 | snapid = cpu_to_le64(snap_id); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4673 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4674 | "rbd", "get_snapshot_name", |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4675 | &snapid, sizeof (snapid), |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4676 | reply_buf, size); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 4677 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4678 | if (ret < 0) { |
| 4679 | snap_name = ERR_PTR(ret); |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4680 | goto out; |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4681 | } |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4682 | |
| 4683 | p = reply_buf; |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4684 | end = reply_buf + ret; |
Alex Elder | e5c3553 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4685 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4686 | if (IS_ERR(snap_name)) |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4687 | goto out; |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4688 | |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4689 | dout(" snap_id 0x%016llx snap_name = %s\n", |
Alex Elder | 54cac61 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4690 | (unsigned long long)snap_id, snap_name); |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4691 | out: |
| 4692 | kfree(reply_buf); |
| 4693 | |
Alex Elder | f40eb34 | 2013-04-25 15:09:42 -0500 | [diff] [blame] | 4694 | return snap_name; |
Alex Elder | b8b1e2d | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 4695 | } |
| 4696 | |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 4697 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
Alex Elder | 117973f | 2012-08-31 17:29:55 -0500 | [diff] [blame] | 4698 | { |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 4699 | bool first_time = rbd_dev->header.object_prefix == NULL; |
Alex Elder | 117973f | 2012-08-31 17:29:55 -0500 | [diff] [blame] | 4700 | int ret; |
Alex Elder | 117973f | 2012-08-31 17:29:55 -0500 | [diff] [blame] | 4701 | |
Josh Durgin | 1617e40 | 2013-06-12 14:43:10 -0700 | [diff] [blame] | 4702 | ret = rbd_dev_v2_image_size(rbd_dev); |
| 4703 | if (ret) |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 4704 | return ret; |
Josh Durgin | 1617e40 | 2013-06-12 14:43:10 -0700 | [diff] [blame] | 4705 | |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 4706 | if (first_time) { |
| 4707 | ret = rbd_dev_v2_header_onetime(rbd_dev); |
| 4708 | if (ret) |
Alex Elder | cfbf637 | 2013-05-31 17:40:45 -0500 | [diff] [blame] | 4709 | return ret; |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 4710 | } |
| 4711 | |
Alex Elder | cc4a38bd | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 4712 | ret = rbd_dev_v2_snap_context(rbd_dev); |
Ilya Dryomov | d194cd1 | 2015-08-31 18:22:10 +0300 | [diff] [blame] | 4713 | if (ret && first_time) { |
| 4714 | kfree(rbd_dev->header.object_prefix); |
| 4715 | rbd_dev->header.object_prefix = NULL; |
| 4716 | } |
Alex Elder | 117973f | 2012-08-31 17:29:55 -0500 | [diff] [blame] | 4717 | |
| 4718 | return ret; |
| 4719 | } |
| 4720 | |
Ilya Dryomov | a720ae0 | 2014-07-23 17:11:19 +0400 | [diff] [blame] | 4721 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
| 4722 | { |
| 4723 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 4724 | |
| 4725 | if (rbd_dev->image_format == 1) |
| 4726 | return rbd_dev_v1_header_info(rbd_dev); |
| 4727 | |
| 4728 | return rbd_dev_v2_header_info(rbd_dev); |
| 4729 | } |
| 4730 | |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4731 | /* |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 4732 | * Get a unique rbd identifier for the given new rbd_dev, and add |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4733 | * the rbd_dev to the global list. |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4734 | */ |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4735 | static int rbd_dev_id_get(struct rbd_device *rbd_dev) |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 4736 | { |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4737 | int new_dev_id; |
| 4738 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4739 | new_dev_id = ida_simple_get(&rbd_dev_id_ida, |
| 4740 | 0, minor_to_rbd_dev_id(1 << MINORBITS), |
| 4741 | GFP_KERNEL); |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4742 | if (new_dev_id < 0) |
| 4743 | return new_dev_id; |
| 4744 | |
| 4745 | rbd_dev->dev_id = new_dev_id; |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 4746 | |
| 4747 | spin_lock(&rbd_dev_list_lock); |
| 4748 | list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| 4749 | spin_unlock(&rbd_dev_list_lock); |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4750 | |
Ilya Dryomov | 70eebd2 | 2013-12-13 15:28:56 +0200 | [diff] [blame] | 4751 | dout("rbd_dev %p given dev id %d\n", rbd_dev, rbd_dev->dev_id); |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4752 | |
| 4753 | return 0; |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4754 | } |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 4755 | |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4756 | /* |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 4757 | * Remove an rbd_dev from the global list, and record that its |
| 4758 | * identifier is no longer in use. |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4759 | */ |
Alex Elder | e283930 | 2012-08-29 17:11:06 -0500 | [diff] [blame] | 4760 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 4761 | { |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 4762 | spin_lock(&rbd_dev_list_lock); |
| 4763 | list_del_init(&rbd_dev->node); |
| 4764 | spin_unlock(&rbd_dev_list_lock); |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 4765 | |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 4766 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
| 4767 | |
| 4768 | dout("rbd_dev %p released dev id %d\n", rbd_dev, rbd_dev->dev_id); |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 4769 | } |
| 4770 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4771 | /* |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4772 | * Skips over white space at *buf, and updates *buf to point to the |
| 4773 | * first found non-space character (if any). Returns the length of |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 4774 | * the token (string of non-white space characters) found. Note |
| 4775 | * that *buf must be terminated with '\0'. |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4776 | */ |
| 4777 | static inline size_t next_token(const char **buf) |
| 4778 | { |
| 4779 | /* |
| 4780 | * These are the characters that produce nonzero for |
| 4781 | * isspace() in the "C" and "POSIX" locales. |
| 4782 | */ |
| 4783 | const char *spaces = " \f\n\r\t\v"; |
| 4784 | |
| 4785 | *buf += strspn(*buf, spaces); /* Find start of token */ |
| 4786 | |
| 4787 | return strcspn(*buf, spaces); /* Return token length */ |
| 4788 | } |
| 4789 | |
| 4790 | /* |
Alex Elder | ea3352f | 2012-07-09 21:04:23 -0500 | [diff] [blame] | 4791 | * Finds the next token in *buf, dynamically allocates a buffer big |
| 4792 | * enough to hold a copy of it, and copies the token into the new |
| 4793 | * buffer. The copy is guaranteed to be terminated with '\0'. Note |
| 4794 | * that a duplicate buffer is created even for a zero-length token. |
| 4795 | * |
| 4796 | * Returns a pointer to the newly-allocated duplicate, or a null |
| 4797 | * pointer if memory for the duplicate was not available. If |
| 4798 | * the lenp argument is a non-null pointer, the length of the token |
| 4799 | * (not including the '\0') is returned in *lenp. |
| 4800 | * |
| 4801 | * If successful, the *buf pointer will be updated to point beyond |
| 4802 | * the end of the found token. |
| 4803 | * |
| 4804 | * Note: uses GFP_KERNEL for allocation. |
| 4805 | */ |
| 4806 | static inline char *dup_token(const char **buf, size_t *lenp) |
| 4807 | { |
| 4808 | char *dup; |
| 4809 | size_t len; |
| 4810 | |
| 4811 | len = next_token(buf); |
Alex Elder | 4caf35f | 2012-11-01 08:39:27 -0500 | [diff] [blame] | 4812 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
Alex Elder | ea3352f | 2012-07-09 21:04:23 -0500 | [diff] [blame] | 4813 | if (!dup) |
| 4814 | return NULL; |
Alex Elder | ea3352f | 2012-07-09 21:04:23 -0500 | [diff] [blame] | 4815 | *(dup + len) = '\0'; |
| 4816 | *buf += len; |
| 4817 | |
| 4818 | if (lenp) |
| 4819 | *lenp = len; |
| 4820 | |
| 4821 | return dup; |
| 4822 | } |
| 4823 | |
| 4824 | /* |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4825 | * Parse the options provided for an "rbd add" (i.e., rbd image |
| 4826 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, |
| 4827 | * and the data written is passed here via a NUL-terminated buffer. |
| 4828 | * Returns 0 if successful or an error code otherwise. |
Alex Elder | d22f76e | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 4829 | * |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4830 | * The information extracted from these options is recorded in |
| 4831 | * the other parameters which return dynamically-allocated |
| 4832 | * structures: |
| 4833 | * ceph_opts |
| 4834 | * The address of a pointer that will refer to a ceph options |
| 4835 | * structure. Caller must release the returned pointer using |
| 4836 | * ceph_destroy_options() when it is no longer needed. |
| 4837 | * rbd_opts |
| 4838 | * Address of an rbd options pointer. Fully initialized by |
| 4839 | * this function; caller must release with kfree(). |
| 4840 | * spec |
| 4841 | * Address of an rbd image specification pointer. Fully |
| 4842 | * initialized by this function based on parsed options. |
| 4843 | * Caller must release with rbd_spec_put(). |
| 4844 | * |
| 4845 | * The options passed take this form: |
| 4846 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] |
| 4847 | * where: |
| 4848 | * <mon_addrs> |
| 4849 | * A comma-separated list of one or more monitor addresses. |
| 4850 | * A monitor address is an ip address, optionally followed |
| 4851 | * by a port number (separated by a colon). |
| 4852 | * I.e.: ip1[:port1][,ip2[:port2]...] |
| 4853 | * <options> |
| 4854 | * A comma-separated list of ceph and/or rbd options. |
| 4855 | * <pool_name> |
| 4856 | * The name of the rados pool containing the rbd image. |
| 4857 | * <image_name> |
| 4858 | * The name of the image in that pool to map. |
| 4859 | * <snap_id> |
| 4860 | * An optional snapshot id. If provided, the mapping will |
| 4861 | * present data from the image at the time that snapshot was |
| 4862 | * created. The image head is used if no snapshot id is |
| 4863 | * provided. Snapshot mappings are always read-only. |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4864 | */ |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4865 | static int rbd_add_parse_args(const char *buf, |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4866 | struct ceph_options **ceph_opts, |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4867 | struct rbd_options **opts, |
| 4868 | struct rbd_spec **rbd_spec) |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4869 | { |
Alex Elder | d22f76e | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 4870 | size_t len; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4871 | char *options; |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4872 | const char *mon_addrs; |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4873 | char *snap_name; |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4874 | size_t mon_addrs_size; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4875 | struct rbd_spec *spec = NULL; |
Alex Elder | 4e9afeb | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4876 | struct rbd_options *rbd_opts = NULL; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4877 | struct ceph_options *copts; |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4878 | int ret; |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4879 | |
| 4880 | /* The first four tokens are required */ |
| 4881 | |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4882 | len = next_token(&buf); |
Alex Elder | 4fb5d671 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4883 | if (!len) { |
| 4884 | rbd_warn(NULL, "no monitor address(es) provided"); |
| 4885 | return -EINVAL; |
| 4886 | } |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4887 | mon_addrs = buf; |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4888 | mon_addrs_size = len + 1; |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4889 | buf += len; |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4890 | |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4891 | ret = -EINVAL; |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4892 | options = dup_token(&buf, NULL); |
| 4893 | if (!options) |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4894 | return -ENOMEM; |
Alex Elder | 4fb5d671 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4895 | if (!*options) { |
| 4896 | rbd_warn(NULL, "no options provided"); |
| 4897 | goto out_err; |
| 4898 | } |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4899 | |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4900 | spec = rbd_spec_alloc(); |
| 4901 | if (!spec) |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4902 | goto out_mem; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4903 | |
| 4904 | spec->pool_name = dup_token(&buf, NULL); |
| 4905 | if (!spec->pool_name) |
| 4906 | goto out_mem; |
Alex Elder | 4fb5d671 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4907 | if (!*spec->pool_name) { |
| 4908 | rbd_warn(NULL, "no pool name provided"); |
| 4909 | goto out_err; |
| 4910 | } |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4911 | |
Alex Elder | 69e7a02 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 4912 | spec->image_name = dup_token(&buf, NULL); |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4913 | if (!spec->image_name) |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4914 | goto out_mem; |
Alex Elder | 4fb5d671 | 2012-11-01 10:17:15 -0500 | [diff] [blame] | 4915 | if (!*spec->image_name) { |
| 4916 | rbd_warn(NULL, "no image name provided"); |
| 4917 | goto out_err; |
| 4918 | } |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4919 | |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4920 | /* |
| 4921 | * Snapshot name is optional; default is to use "-" |
| 4922 | * (indicating the head/no snapshot). |
| 4923 | */ |
Alex Elder | 3feeb894 | 2012-08-31 17:29:52 -0500 | [diff] [blame] | 4924 | len = next_token(&buf); |
Alex Elder | 820a5f3 | 2012-07-09 21:04:24 -0500 | [diff] [blame] | 4925 | if (!len) { |
Alex Elder | 3feeb894 | 2012-08-31 17:29:52 -0500 | [diff] [blame] | 4926 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
| 4927 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4928 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4929 | ret = -ENAMETOOLONG; |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4930 | goto out_err; |
Alex Elder | 849b426 | 2012-07-09 21:04:24 -0500 | [diff] [blame] | 4931 | } |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4932 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
| 4933 | if (!snap_name) |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4934 | goto out_mem; |
Alex Elder | ecb4dc2 | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 4935 | *(snap_name + len) = '\0'; |
| 4936 | spec->snap_name = snap_name; |
Alex Elder | e5c3553 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4937 | |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4938 | /* Initialize all rbd options to the defaults */ |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4939 | |
Alex Elder | 4e9afeb | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4940 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
| 4941 | if (!rbd_opts) |
| 4942 | goto out_mem; |
| 4943 | |
| 4944 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
Ilya Dryomov | b558418 | 2015-06-23 16:21:19 +0300 | [diff] [blame] | 4945 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
Alex Elder | d22f76e | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 4946 | |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4947 | copts = ceph_parse_options(options, mon_addrs, |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4948 | mon_addrs + mon_addrs_size - 1, |
Alex Elder | 4e9afeb | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4949 | parse_rbd_opts_token, rbd_opts); |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4950 | if (IS_ERR(copts)) { |
| 4951 | ret = PTR_ERR(copts); |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4952 | goto out_err; |
| 4953 | } |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4954 | kfree(options); |
| 4955 | |
| 4956 | *ceph_opts = copts; |
Alex Elder | 4e9afeb | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4957 | *opts = rbd_opts; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4958 | *rbd_spec = spec; |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4959 | |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4960 | return 0; |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4961 | out_mem: |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4962 | ret = -ENOMEM; |
Alex Elder | d22f76e | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 4963 | out_err: |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 4964 | kfree(rbd_opts); |
| 4965 | rbd_spec_put(spec); |
Alex Elder | f28e565 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4966 | kfree(options); |
Alex Elder | d22f76e | 2012-07-12 10:46:35 -0500 | [diff] [blame] | 4967 | |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 4968 | return ret; |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 4969 | } |
| 4970 | |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 4971 | /* |
Ilya Dryomov | 30ba1f0 | 2014-05-13 11:19:27 +0400 | [diff] [blame] | 4972 | * Return pool id (>= 0) or a negative error code. |
| 4973 | */ |
| 4974 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) |
| 4975 | { |
Ilya Dryomov | a319bf5 | 2015-05-15 12:02:17 +0300 | [diff] [blame] | 4976 | struct ceph_options *opts = rbdc->client->options; |
Ilya Dryomov | 30ba1f0 | 2014-05-13 11:19:27 +0400 | [diff] [blame] | 4977 | u64 newest_epoch; |
Ilya Dryomov | 30ba1f0 | 2014-05-13 11:19:27 +0400 | [diff] [blame] | 4978 | int tries = 0; |
| 4979 | int ret; |
| 4980 | |
| 4981 | again: |
| 4982 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); |
| 4983 | if (ret == -ENOENT && tries++ < 1) { |
| 4984 | ret = ceph_monc_do_get_version(&rbdc->client->monc, "osdmap", |
| 4985 | &newest_epoch); |
| 4986 | if (ret < 0) |
| 4987 | return ret; |
| 4988 | |
| 4989 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { |
| 4990 | ceph_monc_request_next_osdmap(&rbdc->client->monc); |
| 4991 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
Ilya Dryomov | a319bf5 | 2015-05-15 12:02:17 +0300 | [diff] [blame] | 4992 | newest_epoch, |
| 4993 | opts->mount_timeout); |
Ilya Dryomov | 30ba1f0 | 2014-05-13 11:19:27 +0400 | [diff] [blame] | 4994 | goto again; |
| 4995 | } else { |
| 4996 | /* the osdmap we have is new enough */ |
| 4997 | return -ENOENT; |
| 4998 | } |
| 4999 | } |
| 5000 | |
| 5001 | return ret; |
| 5002 | } |
| 5003 | |
| 5004 | /* |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5005 | * An rbd format 2 image has a unique identifier, distinct from the |
| 5006 | * name given to it by the user. Internally, that identifier is |
| 5007 | * what's used to specify the names of objects related to the image. |
| 5008 | * |
| 5009 | * A special "rbd id" object is used to map an rbd image name to its |
| 5010 | * id. If that object doesn't exist, then there is no v2 rbd image |
| 5011 | * with the supplied name. |
| 5012 | * |
| 5013 | * This function will record the given rbd_dev's image_id field if |
| 5014 | * it can be determined, and in that case will return 0. If any |
| 5015 | * errors occur a negative errno will be returned and the rbd_dev's |
| 5016 | * image_id field will be unchanged (and should be NULL). |
| 5017 | */ |
| 5018 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) |
| 5019 | { |
| 5020 | int ret; |
| 5021 | size_t size; |
| 5022 | char *object_name; |
| 5023 | void *response; |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5024 | char *image_id; |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5025 | |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5026 | /* |
Alex Elder | 2c0d0a1 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5027 | * When probing a parent image, the image id is already |
| 5028 | * known (and the image name likely is not). There's no |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5029 | * need to fetch the image id again in this case. We |
| 5030 | * do still need to set the image format though. |
Alex Elder | 2c0d0a1 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5031 | */ |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5032 | if (rbd_dev->spec->image_id) { |
| 5033 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; |
| 5034 | |
Alex Elder | 2c0d0a1 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5035 | return 0; |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5036 | } |
Alex Elder | 2c0d0a1 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5037 | |
| 5038 | /* |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5039 | * First, see if the format 2 image id file exists, and if |
| 5040 | * so, get the image's persistent id from it. |
| 5041 | */ |
Alex Elder | 69e7a02 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 5042 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5043 | object_name = kmalloc(size, GFP_NOIO); |
| 5044 | if (!object_name) |
| 5045 | return -ENOMEM; |
Alex Elder | 0d7dbfc | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5046 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5047 | dout("rbd id object name is %s\n", object_name); |
| 5048 | |
| 5049 | /* Response will be an encoded string, which includes a length */ |
| 5050 | |
| 5051 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
| 5052 | response = kzalloc(size, GFP_NOIO); |
| 5053 | if (!response) { |
| 5054 | ret = -ENOMEM; |
| 5055 | goto out; |
| 5056 | } |
| 5057 | |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5058 | /* If it doesn't exist we'll assume it's a format 1 image */ |
| 5059 | |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 5060 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
Alex Elder | 4157976 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 5061 | "rbd", "get_id", NULL, 0, |
Alex Elder | e2a58ee | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 5062 | response, RBD_IMAGE_ID_LEN_MAX); |
Alex Elder | 36be9a7 | 2013-01-19 00:30:28 -0600 | [diff] [blame] | 5063 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5064 | if (ret == -ENOENT) { |
| 5065 | image_id = kstrdup("", GFP_KERNEL); |
| 5066 | ret = image_id ? 0 : -ENOMEM; |
| 5067 | if (!ret) |
| 5068 | rbd_dev->image_format = 1; |
Ilya Dryomov | 7dd440c | 2014-09-11 18:49:18 +0400 | [diff] [blame] | 5069 | } else if (ret >= 0) { |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5070 | void *p = response; |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5071 | |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5072 | image_id = ceph_extract_encoded_string(&p, p + ret, |
Alex Elder | 979ed48 | 2012-11-01 08:39:26 -0500 | [diff] [blame] | 5073 | NULL, GFP_NOIO); |
Duan Jiong | 461f758 | 2014-04-11 16:38:12 +0800 | [diff] [blame] | 5074 | ret = PTR_ERR_OR_ZERO(image_id); |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5075 | if (!ret) |
| 5076 | rbd_dev->image_format = 2; |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5077 | } |
| 5078 | |
| 5079 | if (!ret) { |
| 5080 | rbd_dev->spec->image_id = image_id; |
| 5081 | dout("image_id is %s\n", image_id); |
Alex Elder | 589d30e | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5082 | } |
| 5083 | out: |
| 5084 | kfree(response); |
| 5085 | kfree(object_name); |
| 5086 | |
| 5087 | return ret; |
| 5088 | } |
| 5089 | |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5090 | /* |
| 5091 | * Undo whatever state changes are made by v1 or v2 header info |
| 5092 | * call. |
| 5093 | */ |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5094 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
| 5095 | { |
| 5096 | struct rbd_image_header *header; |
| 5097 | |
Ilya Dryomov | e69b8d4 | 2015-01-19 12:06:14 +0300 | [diff] [blame] | 5098 | rbd_dev_parent_put(rbd_dev); |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5099 | |
| 5100 | /* Free dynamic fields from the header, then zero it out */ |
| 5101 | |
| 5102 | header = &rbd_dev->header; |
Alex Elder | 812164f8 | 2013-04-30 00:44:32 -0500 | [diff] [blame] | 5103 | ceph_put_snap_context(header->snapc); |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5104 | kfree(header->snap_sizes); |
| 5105 | kfree(header->snap_names); |
| 5106 | kfree(header->object_prefix); |
| 5107 | memset(header, 0, sizeof (*header)); |
| 5108 | } |
| 5109 | |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5110 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5111 | { |
| 5112 | int ret; |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5113 | |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5114 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 5115 | if (ret) |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5116 | goto out_err; |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5117 | |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5118 | /* |
| 5119 | * Get the and check features for the image. Currently the |
| 5120 | * features are assumed to never change. |
| 5121 | */ |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5122 | ret = rbd_dev_v2_features(rbd_dev); |
Alex Elder | 57385b5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 5123 | if (ret) |
Alex Elder | b1b5402 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5124 | goto out_err; |
Alex Elder | 35d489f | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5125 | |
Alex Elder | cc070d5 | 2013-04-21 12:14:45 -0500 | [diff] [blame] | 5126 | /* If the image supports fancy striping, get its parameters */ |
| 5127 | |
| 5128 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { |
| 5129 | ret = rbd_dev_v2_striping_info(rbd_dev); |
| 5130 | if (ret < 0) |
| 5131 | goto out_err; |
| 5132 | } |
Alex Elder | 2df3fac | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5133 | /* No support for crypto and compression type format 2 images */ |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5134 | |
Alex Elder | 3515297 | 2012-08-31 17:29:55 -0500 | [diff] [blame] | 5135 | return 0; |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5136 | out_err: |
Alex Elder | 642a253 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5137 | rbd_dev->header.features = 0; |
Alex Elder | 1e13019 | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5138 | kfree(rbd_dev->header.object_prefix); |
| 5139 | rbd_dev->header.object_prefix = NULL; |
Alex Elder | 9d475de | 2012-07-03 16:01:19 -0500 | [diff] [blame] | 5140 | |
| 5141 | return ret; |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5142 | } |
| 5143 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5144 | /* |
| 5145 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> |
| 5146 | * rbd_dev_image_probe() recursion depth, which means it's also the |
| 5147 | * length of the already discovered part of the parent chain. |
| 5148 | */ |
| 5149 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5150 | { |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5151 | struct rbd_device *parent = NULL; |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5152 | int ret; |
| 5153 | |
| 5154 | if (!rbd_dev->parent_spec) |
| 5155 | return 0; |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5156 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5157 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
| 5158 | pr_info("parent chain is too long (%d)\n", depth); |
| 5159 | ret = -EINVAL; |
| 5160 | goto out_err; |
| 5161 | } |
| 5162 | |
Ilya Dryomov | 1f2c665 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5163 | parent = rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec, |
| 5164 | NULL); |
| 5165 | if (!parent) { |
| 5166 | ret = -ENOMEM; |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5167 | goto out_err; |
Ilya Dryomov | 1f2c665 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5168 | } |
| 5169 | |
| 5170 | /* |
| 5171 | * Images related by parent/child relationships always share |
| 5172 | * rbd_client and spec/parent_spec, so bump their refcounts. |
| 5173 | */ |
| 5174 | __rbd_get_client(rbd_dev->rbd_client); |
| 5175 | rbd_spec_get(rbd_dev->parent_spec); |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5176 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5177 | ret = rbd_dev_image_probe(parent, depth); |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5178 | if (ret < 0) |
| 5179 | goto out_err; |
Ilya Dryomov | 1f2c665 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5180 | |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5181 | rbd_dev->parent = parent; |
Alex Elder | a2acd00 | 2013-05-08 22:50:04 -0500 | [diff] [blame] | 5182 | atomic_set(&rbd_dev->parent_ref, 1); |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5183 | return 0; |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5184 | |
Ilya Dryomov | 1f2c665 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5185 | out_err: |
| 5186 | rbd_dev_unparent(rbd_dev); |
| 5187 | if (parent) |
| 5188 | rbd_dev_destroy(parent); |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5189 | return ret; |
| 5190 | } |
| 5191 | |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5192 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
Alex Elder | 124afba | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5193 | { |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5194 | int ret; |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5195 | |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5196 | /* Get an id and fill in device name. */ |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5197 | |
Ilya Dryomov | f8a22fc | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5198 | ret = rbd_dev_id_get(rbd_dev); |
| 5199 | if (ret) |
| 5200 | return ret; |
| 5201 | |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5202 | BUILD_BUG_ON(DEV_NAME_LEN |
| 5203 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); |
| 5204 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
| 5205 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5206 | /* Record our major and minor device numbers. */ |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5207 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5208 | if (!single_major) { |
| 5209 | ret = register_blkdev(0, rbd_dev->name); |
| 5210 | if (ret < 0) |
| 5211 | goto err_out_id; |
| 5212 | |
| 5213 | rbd_dev->major = ret; |
| 5214 | rbd_dev->minor = 0; |
| 5215 | } else { |
| 5216 | rbd_dev->major = rbd_major; |
| 5217 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); |
| 5218 | } |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5219 | |
| 5220 | /* Set up the blkdev mapping. */ |
| 5221 | |
| 5222 | ret = rbd_init_disk(rbd_dev); |
| 5223 | if (ret) |
| 5224 | goto err_out_blkdev; |
| 5225 | |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 5226 | ret = rbd_dev_mapping_set(rbd_dev); |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5227 | if (ret) |
| 5228 | goto err_out_disk; |
Ilya Dryomov | bc1ecc6 | 2014-08-04 18:04:39 +0400 | [diff] [blame] | 5229 | |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 5230 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
Josh Durgin | 22001f6 | 2013-09-30 20:10:04 -0700 | [diff] [blame] | 5231 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 5232 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5233 | dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
| 5234 | ret = device_add(&rbd_dev->dev); |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 5235 | if (ret) |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5236 | goto err_out_mapping; |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5237 | |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5238 | /* Everything's ready. Announce the disk to the world. */ |
| 5239 | |
Alex Elder | 129b79d | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5240 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5241 | add_disk(rbd_dev->disk); |
| 5242 | |
| 5243 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
| 5244 | (unsigned long long) rbd_dev->mapping.size); |
| 5245 | |
| 5246 | return ret; |
Alex Elder | 2f82ee5 | 2012-10-30 19:40:33 -0500 | [diff] [blame] | 5247 | |
Alex Elder | f35a4de | 2013-05-06 09:51:29 -0500 | [diff] [blame] | 5248 | err_out_mapping: |
| 5249 | rbd_dev_mapping_clear(rbd_dev); |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5250 | err_out_disk: |
| 5251 | rbd_free_disk(rbd_dev); |
| 5252 | err_out_blkdev: |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5253 | if (!single_major) |
| 5254 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5255 | err_out_id: |
| 5256 | rbd_dev_id_put(rbd_dev); |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5257 | return ret; |
| 5258 | } |
| 5259 | |
Alex Elder | 332bb12 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5260 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
| 5261 | { |
| 5262 | struct rbd_spec *spec = rbd_dev->spec; |
| 5263 | size_t size; |
| 5264 | |
| 5265 | /* Record the header object name for this rbd image. */ |
| 5266 | |
| 5267 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 5268 | |
| 5269 | if (rbd_dev->image_format == 1) |
| 5270 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); |
| 5271 | else |
| 5272 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); |
| 5273 | |
| 5274 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
| 5275 | if (!rbd_dev->header_name) |
| 5276 | return -ENOMEM; |
| 5277 | |
| 5278 | if (rbd_dev->image_format == 1) |
| 5279 | sprintf(rbd_dev->header_name, "%s%s", |
| 5280 | spec->image_name, RBD_SUFFIX); |
| 5281 | else |
| 5282 | sprintf(rbd_dev->header_name, "%s%s", |
| 5283 | RBD_HEADER_PREFIX, spec->image_id); |
| 5284 | return 0; |
| 5285 | } |
| 5286 | |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5287 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
| 5288 | { |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5289 | rbd_dev_unprobe(rbd_dev); |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5290 | kfree(rbd_dev->header_name); |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5291 | rbd_dev->header_name = NULL; |
| 5292 | rbd_dev->image_format = 0; |
| 5293 | kfree(rbd_dev->spec->image_id); |
| 5294 | rbd_dev->spec->image_id = NULL; |
| 5295 | |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5296 | rbd_dev_destroy(rbd_dev); |
| 5297 | } |
| 5298 | |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5299 | /* |
| 5300 | * Probe for the existence of the header object for the given rbd |
Alex Elder | 1f3ef78 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5301 | * device. If this image is the one being mapped (i.e., not a |
| 5302 | * parent), initiate a watch on its header object before using that |
| 5303 | * object to get detailed information about the rbd image. |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5304 | */ |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5305 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5306 | { |
| 5307 | int ret; |
| 5308 | |
| 5309 | /* |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5310 | * Get the id from the image id object. Unless there's an |
| 5311 | * error, rbd_dev->spec->image_id will be filled in with |
| 5312 | * a dynamically-allocated string, and rbd_dev->image_format |
| 5313 | * will be set to either 1 or 2. |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5314 | */ |
| 5315 | ret = rbd_dev_image_id(rbd_dev); |
| 5316 | if (ret) |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5317 | return ret; |
Alex Elder | c0fba36 | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5318 | |
Alex Elder | 332bb12 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5319 | ret = rbd_dev_header_name(rbd_dev); |
| 5320 | if (ret) |
| 5321 | goto err_out_format; |
| 5322 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5323 | if (!depth) { |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 5324 | ret = rbd_dev_header_watch_sync(rbd_dev); |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5325 | if (ret) { |
| 5326 | if (ret == -ENOENT) |
| 5327 | pr_info("image %s/%s does not exist\n", |
| 5328 | rbd_dev->spec->pool_name, |
| 5329 | rbd_dev->spec->image_name); |
Alex Elder | 1f3ef78 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5330 | goto out_header_name; |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5331 | } |
Alex Elder | 1f3ef78 | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5332 | } |
Alex Elder | b644de2 | 2013-04-27 09:59:31 -0500 | [diff] [blame] | 5333 | |
Ilya Dryomov | a720ae0 | 2014-07-23 17:11:19 +0400 | [diff] [blame] | 5334 | ret = rbd_dev_header_info(rbd_dev); |
Alex Elder | 5655c4d | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5335 | if (ret) |
Alex Elder | b644de2 | 2013-04-27 09:59:31 -0500 | [diff] [blame] | 5336 | goto err_out_watch; |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5337 | |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 5338 | /* |
| 5339 | * If this image is the one being mapped, we have pool name and |
| 5340 | * id, image name and id, and snap name - need to fill snap id. |
| 5341 | * Otherwise this is a parent image, identified by pool, image |
| 5342 | * and snap ids - need to fill in names for those ids. |
| 5343 | */ |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5344 | if (!depth) |
Ilya Dryomov | 0407759 | 2014-07-23 17:11:20 +0400 | [diff] [blame] | 5345 | ret = rbd_spec_fill_snap_id(rbd_dev); |
| 5346 | else |
| 5347 | ret = rbd_spec_fill_names(rbd_dev); |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5348 | if (ret) { |
| 5349 | if (ret == -ENOENT) |
| 5350 | pr_info("snap %s/%s@%s does not exist\n", |
| 5351 | rbd_dev->spec->pool_name, |
| 5352 | rbd_dev->spec->image_name, |
| 5353 | rbd_dev->spec->snap_name); |
Alex Elder | 33dca39 | 2013-04-30 00:44:33 -0500 | [diff] [blame] | 5354 | goto err_out_probe; |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5355 | } |
Alex Elder | 9bb81c9 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5356 | |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 5357 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
| 5358 | ret = rbd_dev_v2_parent_info(rbd_dev); |
| 5359 | if (ret) |
| 5360 | goto err_out_probe; |
| 5361 | |
| 5362 | /* |
| 5363 | * Need to warn users if this image is the one being |
| 5364 | * mapped and has a parent. |
| 5365 | */ |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5366 | if (!depth && rbd_dev->parent_spec) |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 5367 | rbd_warn(rbd_dev, |
| 5368 | "WARNING: kernel layering is EXPERIMENTAL!"); |
| 5369 | } |
| 5370 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5371 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
Alex Elder | 30d60ba | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5372 | if (ret) |
| 5373 | goto err_out_probe; |
Alex Elder | 83a0626 | 2012-10-30 15:47:17 -0500 | [diff] [blame] | 5374 | |
Alex Elder | 30d60ba | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5375 | dout("discovered format %u image, header name is %s\n", |
| 5376 | rbd_dev->image_format, rbd_dev->header_name); |
Alex Elder | 30d60ba | 2013-05-06 09:51:30 -0500 | [diff] [blame] | 5377 | return 0; |
Ilya Dryomov | e8f59b5 | 2014-07-24 10:42:13 +0400 | [diff] [blame] | 5378 | |
Alex Elder | 6fd48b3 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5379 | err_out_probe: |
| 5380 | rbd_dev_unprobe(rbd_dev); |
Alex Elder | b644de2 | 2013-04-27 09:59:31 -0500 | [diff] [blame] | 5381 | err_out_watch: |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5382 | if (!depth) |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 5383 | rbd_dev_header_unwatch_sync(rbd_dev); |
Alex Elder | 332bb12 | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5384 | out_header_name: |
| 5385 | kfree(rbd_dev->header_name); |
| 5386 | rbd_dev->header_name = NULL; |
| 5387 | err_out_format: |
| 5388 | rbd_dev->image_format = 0; |
Alex Elder | 5655c4d | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5389 | kfree(rbd_dev->spec->image_id); |
| 5390 | rbd_dev->spec->image_id = NULL; |
Alex Elder | 5655c4d | 2013-04-25 23:15:08 -0500 | [diff] [blame] | 5391 | return ret; |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5392 | } |
| 5393 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5394 | static ssize_t do_rbd_add(struct bus_type *bus, |
| 5395 | const char *buf, |
| 5396 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5397 | { |
Alex Elder | cb8627c | 2012-07-09 21:04:23 -0500 | [diff] [blame] | 5398 | struct rbd_device *rbd_dev = NULL; |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5399 | struct ceph_options *ceph_opts = NULL; |
Alex Elder | 4e9afeb | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5400 | struct rbd_options *rbd_opts = NULL; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5401 | struct rbd_spec *spec = NULL; |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5402 | struct rbd_client *rbdc; |
Alex Elder | 51344a3 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 5403 | bool read_only; |
Ilya Dryomov | b51c83c | 2015-10-15 15:38:57 +0200 | [diff] [blame] | 5404 | int rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5405 | |
| 5406 | if (!try_module_get(THIS_MODULE)) |
| 5407 | return -ENODEV; |
| 5408 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 5409 | /* parse add command */ |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5410 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
Alex Elder | dc79b11 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5411 | if (rc < 0) |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5412 | goto out; |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 5413 | |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5414 | rbdc = rbd_get_client(ceph_opts); |
| 5415 | if (IS_ERR(rbdc)) { |
| 5416 | rc = PTR_ERR(rbdc); |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5417 | goto err_out_args; |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5418 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5419 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5420 | /* pick the pool */ |
Ilya Dryomov | 30ba1f0 | 2014-05-13 11:19:27 +0400 | [diff] [blame] | 5421 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5422 | if (rc < 0) { |
| 5423 | if (rc == -ENOENT) |
| 5424 | pr_info("pool %s does not exist\n", spec->pool_name); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5425 | goto err_out_client; |
Ilya Dryomov | 1fe4802 | 2015-03-05 10:47:22 +0300 | [diff] [blame] | 5426 | } |
Alex Elder | c0cd10db | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 5427 | spec->pool_id = (u64)rc; |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5428 | |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 5429 | /* The ceph file layout needs to fit pool id in 32 bits */ |
| 5430 | |
Alex Elder | c0cd10db | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 5431 | if (spec->pool_id > (u64)U32_MAX) { |
Ilya Dryomov | 9584d50 | 2014-07-11 12:11:20 +0400 | [diff] [blame] | 5432 | rbd_warn(NULL, "pool id too large (%llu > %u)", |
Alex Elder | c0cd10db | 2013-04-26 09:43:47 -0500 | [diff] [blame] | 5433 | (unsigned long long)spec->pool_id, U32_MAX); |
Alex Elder | 0903e87 | 2012-11-14 12:25:19 -0600 | [diff] [blame] | 5434 | rc = -EIO; |
| 5435 | goto err_out_client; |
| 5436 | } |
| 5437 | |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 5438 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
Ilya Dryomov | b51c83c | 2015-10-15 15:38:57 +0200 | [diff] [blame] | 5439 | if (!rbd_dev) { |
| 5440 | rc = -ENOMEM; |
Alex Elder | bd4ba65 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5441 | goto err_out_client; |
Ilya Dryomov | b51c83c | 2015-10-15 15:38:57 +0200 | [diff] [blame] | 5442 | } |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5443 | rbdc = NULL; /* rbd_dev now owns this */ |
| 5444 | spec = NULL; /* rbd_dev now owns this */ |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 5445 | rbd_opts = NULL; /* rbd_dev now owns this */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5446 | |
Ilya Dryomov | 6d69bb53 | 2015-10-11 19:38:00 +0200 | [diff] [blame] | 5447 | rc = rbd_dev_image_probe(rbd_dev, 0); |
Alex Elder | a30b71b | 2012-07-10 20:30:11 -0500 | [diff] [blame] | 5448 | if (rc < 0) |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5449 | goto err_out_rbd_dev; |
Alex Elder | 05fd6f6 | 2012-08-29 17:11:07 -0500 | [diff] [blame] | 5450 | |
Alex Elder | 7ce4eef | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5451 | /* If we are mapping a snapshot it must be marked read-only */ |
| 5452 | |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 5453 | read_only = rbd_dev->opts->read_only; |
Alex Elder | 7ce4eef | 2013-05-06 17:40:33 -0500 | [diff] [blame] | 5454 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| 5455 | read_only = true; |
| 5456 | rbd_dev->mapping.read_only = read_only; |
| 5457 | |
Alex Elder | b536f69 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5458 | rc = rbd_dev_device_setup(rbd_dev); |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5459 | if (rc) { |
Ilya Dryomov | e37180c | 2013-12-16 18:02:41 +0200 | [diff] [blame] | 5460 | /* |
| 5461 | * rbd_dev_header_unwatch_sync() can't be moved into |
| 5462 | * rbd_dev_image_release() without refactoring, see |
| 5463 | * commit 1f3ef78861ac. |
| 5464 | */ |
| 5465 | rbd_dev_header_unwatch_sync(rbd_dev); |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5466 | rbd_dev_image_release(rbd_dev); |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5467 | goto out; |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5468 | } |
Alex Elder | b536f69 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5469 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5470 | rc = count; |
| 5471 | out: |
| 5472 | module_put(THIS_MODULE); |
| 5473 | return rc; |
Alex Elder | 3abef3b | 2013-05-13 20:35:37 -0500 | [diff] [blame] | 5474 | |
Alex Elder | c53d589 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5475 | err_out_rbd_dev: |
| 5476 | rbd_dev_destroy(rbd_dev); |
Alex Elder | bd4ba65 | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5477 | err_out_client: |
Alex Elder | 9d3997f | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5478 | rbd_put_client(rbdc); |
Alex Elder | 0ddebc0 | 2012-10-25 23:34:41 -0500 | [diff] [blame] | 5479 | err_out_args: |
Alex Elder | 859c31d | 2012-10-25 23:34:42 -0500 | [diff] [blame] | 5480 | rbd_spec_put(spec); |
Ilya Dryomov | d147543 | 2015-06-22 13:24:48 +0300 | [diff] [blame] | 5481 | kfree(rbd_opts); |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5482 | goto out; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5483 | } |
| 5484 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5485 | static ssize_t rbd_add(struct bus_type *bus, |
| 5486 | const char *buf, |
| 5487 | size_t count) |
| 5488 | { |
| 5489 | if (single_major) |
| 5490 | return -EINVAL; |
| 5491 | |
| 5492 | return do_rbd_add(bus, buf, count); |
| 5493 | } |
| 5494 | |
| 5495 | static ssize_t rbd_add_single_major(struct bus_type *bus, |
| 5496 | const char *buf, |
| 5497 | size_t count) |
| 5498 | { |
| 5499 | return do_rbd_add(bus, buf, count); |
| 5500 | } |
| 5501 | |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5502 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5503 | { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5504 | rbd_free_disk(rbd_dev); |
Alex Elder | 200a6a8 | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5505 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5506 | device_del(&rbd_dev->dev); |
Alex Elder | 6d80b13 | 2013-05-06 07:40:30 -0500 | [diff] [blame] | 5507 | rbd_dev_mapping_clear(rbd_dev); |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5508 | if (!single_major) |
| 5509 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
Alex Elder | e283930 | 2012-08-29 17:11:06 -0500 | [diff] [blame] | 5510 | rbd_dev_id_put(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5511 | } |
| 5512 | |
Alex Elder | 05a46af | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5513 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
| 5514 | { |
Alex Elder | ad945fc | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5515 | while (rbd_dev->parent) { |
Alex Elder | 05a46af | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5516 | struct rbd_device *first = rbd_dev; |
| 5517 | struct rbd_device *second = first->parent; |
| 5518 | struct rbd_device *third; |
| 5519 | |
| 5520 | /* |
| 5521 | * Follow to the parent with no grandparent and |
| 5522 | * remove it. |
| 5523 | */ |
| 5524 | while (second && (third = second->parent)) { |
| 5525 | first = second; |
| 5526 | second = third; |
| 5527 | } |
Alex Elder | ad945fc | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5528 | rbd_assert(second); |
Alex Elder | 8ad42cd | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5529 | rbd_dev_image_release(second); |
Alex Elder | ad945fc | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5530 | first->parent = NULL; |
| 5531 | first->parent_overlap = 0; |
| 5532 | |
| 5533 | rbd_assert(first->parent_spec); |
Alex Elder | 05a46af | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5534 | rbd_spec_put(first->parent_spec); |
| 5535 | first->parent_spec = NULL; |
Alex Elder | 05a46af | 2013-04-26 15:44:36 -0500 | [diff] [blame] | 5536 | } |
| 5537 | } |
| 5538 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5539 | static ssize_t do_rbd_remove(struct bus_type *bus, |
| 5540 | const char *buf, |
| 5541 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5542 | { |
| 5543 | struct rbd_device *rbd_dev = NULL; |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5544 | struct list_head *tmp; |
| 5545 | int dev_id; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5546 | unsigned long ul; |
Alex Elder | 82a442d | 2013-05-31 17:40:44 -0500 | [diff] [blame] | 5547 | bool already = false; |
Alex Elder | 0d8189e | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5548 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5549 | |
Jingoo Han | bb8e0e8 | 2013-09-11 14:20:07 -0700 | [diff] [blame] | 5550 | ret = kstrtoul(buf, 10, &ul); |
Alex Elder | 0d8189e | 2013-04-27 09:59:30 -0500 | [diff] [blame] | 5551 | if (ret) |
| 5552 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5553 | |
| 5554 | /* convert to int; abort if we lost anything in the conversion */ |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5555 | dev_id = (int)ul; |
| 5556 | if (dev_id != ul) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5557 | return -EINVAL; |
| 5558 | |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5559 | ret = -ENOENT; |
| 5560 | spin_lock(&rbd_dev_list_lock); |
| 5561 | list_for_each(tmp, &rbd_dev_list) { |
| 5562 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
| 5563 | if (rbd_dev->dev_id == dev_id) { |
| 5564 | ret = 0; |
| 5565 | break; |
| 5566 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5567 | } |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5568 | if (!ret) { |
| 5569 | spin_lock_irq(&rbd_dev->lock); |
| 5570 | if (rbd_dev->open_count) |
| 5571 | ret = -EBUSY; |
| 5572 | else |
Alex Elder | 82a442d | 2013-05-31 17:40:44 -0500 | [diff] [blame] | 5573 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
| 5574 | &rbd_dev->flags); |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5575 | spin_unlock_irq(&rbd_dev->lock); |
| 5576 | } |
| 5577 | spin_unlock(&rbd_dev_list_lock); |
Alex Elder | 82a442d | 2013-05-31 17:40:44 -0500 | [diff] [blame] | 5578 | if (ret < 0 || already) |
Alex Elder | 1ba0f1e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5579 | return ret; |
Alex Elder | 751cc0e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5580 | |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 5581 | rbd_dev_header_unwatch_sync(rbd_dev); |
Josh Durgin | 9abc599 | 2013-08-29 17:31:03 -0700 | [diff] [blame] | 5582 | /* |
| 5583 | * flush remaining watch callbacks - these must be complete |
| 5584 | * before the osd_client is shutdown |
| 5585 | */ |
| 5586 | dout("%s: flushing notifies", __func__); |
| 5587 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
Ilya Dryomov | fca2706 | 2013-12-16 18:02:40 +0200 | [diff] [blame] | 5588 | |
Josh Durgin | 9875201 | 2013-08-29 17:26:31 -0700 | [diff] [blame] | 5589 | /* |
| 5590 | * Don't free anything from rbd_dev->disk until after all |
| 5591 | * notifies are completely processed. Otherwise |
| 5592 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting |
| 5593 | * in a potential use after free of rbd_dev->disk or rbd_dev. |
| 5594 | */ |
Ilya Dryomov | dd5ac32 | 2015-10-16 17:09:24 +0200 | [diff] [blame] | 5595 | rbd_dev_device_release(rbd_dev); |
Alex Elder | 8ad42cd | 2013-04-28 23:32:34 -0500 | [diff] [blame] | 5596 | rbd_dev_image_release(rbd_dev); |
Alex Elder | aafb230e | 2012-09-06 16:00:54 -0500 | [diff] [blame] | 5597 | |
Alex Elder | 1ba0f1e | 2013-05-31 15:17:01 -0500 | [diff] [blame] | 5598 | return count; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5599 | } |
| 5600 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5601 | static ssize_t rbd_remove(struct bus_type *bus, |
| 5602 | const char *buf, |
| 5603 | size_t count) |
| 5604 | { |
| 5605 | if (single_major) |
| 5606 | return -EINVAL; |
| 5607 | |
| 5608 | return do_rbd_remove(bus, buf, count); |
| 5609 | } |
| 5610 | |
| 5611 | static ssize_t rbd_remove_single_major(struct bus_type *bus, |
| 5612 | const char *buf, |
| 5613 | size_t count) |
| 5614 | { |
| 5615 | return do_rbd_remove(bus, buf, count); |
| 5616 | } |
| 5617 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5618 | /* |
| 5619 | * create control files in sysfs |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 5620 | * /sys/bus/rbd/... |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5621 | */ |
| 5622 | static int rbd_sysfs_init(void) |
| 5623 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 5624 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5625 | |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 5626 | ret = device_register(&rbd_root_dev); |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 5627 | if (ret < 0) |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 5628 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5629 | |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 5630 | ret = bus_register(&rbd_bus_type); |
| 5631 | if (ret < 0) |
| 5632 | device_unregister(&rbd_root_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5633 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5634 | return ret; |
| 5635 | } |
| 5636 | |
| 5637 | static void rbd_sysfs_cleanup(void) |
| 5638 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 5639 | bus_unregister(&rbd_bus_type); |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 5640 | device_unregister(&rbd_root_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5641 | } |
| 5642 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5643 | static int rbd_slab_init(void) |
| 5644 | { |
| 5645 | rbd_assert(!rbd_img_request_cache); |
| 5646 | rbd_img_request_cache = kmem_cache_create("rbd_img_request", |
| 5647 | sizeof (struct rbd_img_request), |
| 5648 | __alignof__(struct rbd_img_request), |
| 5649 | 0, NULL); |
Alex Elder | 868311b | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5650 | if (!rbd_img_request_cache) |
| 5651 | return -ENOMEM; |
| 5652 | |
| 5653 | rbd_assert(!rbd_obj_request_cache); |
| 5654 | rbd_obj_request_cache = kmem_cache_create("rbd_obj_request", |
| 5655 | sizeof (struct rbd_obj_request), |
| 5656 | __alignof__(struct rbd_obj_request), |
| 5657 | 0, NULL); |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 5658 | if (!rbd_obj_request_cache) |
| 5659 | goto out_err; |
| 5660 | |
| 5661 | rbd_assert(!rbd_segment_name_cache); |
| 5662 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", |
Ilya Dryomov | 2d0ebc5 | 2014-01-27 17:40:18 +0200 | [diff] [blame] | 5663 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 5664 | if (rbd_segment_name_cache) |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5665 | return 0; |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 5666 | out_err: |
Julia Lawall | 13bf283 | 2015-09-13 14:15:26 +0200 | [diff] [blame] | 5667 | kmem_cache_destroy(rbd_obj_request_cache); |
| 5668 | rbd_obj_request_cache = NULL; |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5669 | |
Alex Elder | 868311b | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5670 | kmem_cache_destroy(rbd_img_request_cache); |
| 5671 | rbd_img_request_cache = NULL; |
| 5672 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5673 | return -ENOMEM; |
| 5674 | } |
| 5675 | |
| 5676 | static void rbd_slab_exit(void) |
| 5677 | { |
Alex Elder | 78c2a44 | 2013-05-01 12:43:04 -0500 | [diff] [blame] | 5678 | rbd_assert(rbd_segment_name_cache); |
| 5679 | kmem_cache_destroy(rbd_segment_name_cache); |
| 5680 | rbd_segment_name_cache = NULL; |
| 5681 | |
Alex Elder | 868311b | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5682 | rbd_assert(rbd_obj_request_cache); |
| 5683 | kmem_cache_destroy(rbd_obj_request_cache); |
| 5684 | rbd_obj_request_cache = NULL; |
| 5685 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5686 | rbd_assert(rbd_img_request_cache); |
| 5687 | kmem_cache_destroy(rbd_img_request_cache); |
| 5688 | rbd_img_request_cache = NULL; |
| 5689 | } |
| 5690 | |
Alex Elder | cc344fa | 2013-02-19 12:25:56 -0600 | [diff] [blame] | 5691 | static int __init rbd_init(void) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5692 | { |
| 5693 | int rc; |
| 5694 | |
Alex Elder | 1e32d34 | 2013-01-30 11:13:33 -0600 | [diff] [blame] | 5695 | if (!libceph_compatible(NULL)) { |
| 5696 | rbd_warn(NULL, "libceph incompatibility (quitting)"); |
Alex Elder | 1e32d34 | 2013-01-30 11:13:33 -0600 | [diff] [blame] | 5697 | return -EINVAL; |
| 5698 | } |
Ilya Dryomov | e1b4d96 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5699 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5700 | rc = rbd_slab_init(); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5701 | if (rc) |
| 5702 | return rc; |
Ilya Dryomov | e1b4d96 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5703 | |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5704 | /* |
| 5705 | * The number of active work items is limited by the number of |
Ilya Dryomov | f77303b | 2015-04-22 18:28:13 +0300 | [diff] [blame] | 5706 | * rbd devices * queue depth, so leave @max_active at default. |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5707 | */ |
| 5708 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); |
| 5709 | if (!rbd_wq) { |
| 5710 | rc = -ENOMEM; |
| 5711 | goto err_out_slab; |
| 5712 | } |
| 5713 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5714 | if (single_major) { |
| 5715 | rbd_major = register_blkdev(0, RBD_DRV_NAME); |
| 5716 | if (rbd_major < 0) { |
| 5717 | rc = rbd_major; |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5718 | goto err_out_wq; |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5719 | } |
| 5720 | } |
| 5721 | |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5722 | rc = rbd_sysfs_init(); |
| 5723 | if (rc) |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5724 | goto err_out_blkdev; |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5725 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5726 | if (single_major) |
| 5727 | pr_info("loaded (major %d)\n", rbd_major); |
| 5728 | else |
| 5729 | pr_info("loaded\n"); |
| 5730 | |
Ilya Dryomov | e1b4d96 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5731 | return 0; |
| 5732 | |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5733 | err_out_blkdev: |
| 5734 | if (single_major) |
| 5735 | unregister_blkdev(rbd_major, RBD_DRV_NAME); |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5736 | err_out_wq: |
| 5737 | destroy_workqueue(rbd_wq); |
Ilya Dryomov | e1b4d96 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5738 | err_out_slab: |
| 5739 | rbd_slab_exit(); |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5740 | return rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5741 | } |
| 5742 | |
Alex Elder | cc344fa | 2013-02-19 12:25:56 -0600 | [diff] [blame] | 5743 | static void __exit rbd_exit(void) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5744 | { |
Ilya Dryomov | ffe312c | 2014-05-20 15:46:04 +0400 | [diff] [blame] | 5745 | ida_destroy(&rbd_dev_id_ida); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5746 | rbd_sysfs_cleanup(); |
Ilya Dryomov | 9b60e70 | 2013-12-13 15:28:57 +0200 | [diff] [blame] | 5747 | if (single_major) |
| 5748 | unregister_blkdev(rbd_major, RBD_DRV_NAME); |
Ilya Dryomov | f5ee37b | 2014-10-09 17:06:01 +0400 | [diff] [blame] | 5749 | destroy_workqueue(rbd_wq); |
Alex Elder | 1c2a9df | 2013-05-01 12:43:03 -0500 | [diff] [blame] | 5750 | rbd_slab_exit(); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5751 | } |
| 5752 | |
| 5753 | module_init(rbd_init); |
| 5754 | module_exit(rbd_exit); |
| 5755 | |
Alex Elder | d552c61 | 2013-05-31 20:13:09 -0500 | [diff] [blame] | 5756 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5757 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| 5758 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5759 | /* following authorship retained from original osdblk.c */ |
| 5760 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| 5761 | |
Ilya Dryomov | 90da258 | 2013-12-13 15:28:56 +0200 | [diff] [blame] | 5762 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 5763 | MODULE_LICENSE("GPL"); |