Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | rbd.c -- Export ceph rados objects as a Linux block device |
| 3 | |
| 4 | |
| 5 | based on drivers/block/osdblk.c: |
| 6 | |
| 7 | Copyright 2009 Red Hat, Inc. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; see the file COPYING. If not, write to |
| 20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | |
| 22 | |
| 23 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 24 | For usage instructions, please refer to: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 25 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 27 | |
| 28 | */ |
| 29 | |
| 30 | #include <linux/ceph/libceph.h> |
| 31 | #include <linux/ceph/osd_client.h> |
| 32 | #include <linux/ceph/mon_client.h> |
| 33 | #include <linux/ceph/decode.h> |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 34 | #include <linux/parser.h> |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 35 | |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/device.h> |
| 38 | #include <linux/module.h> |
| 39 | #include <linux/fs.h> |
| 40 | #include <linux/blkdev.h> |
| 41 | |
| 42 | #include "rbd_types.h" |
| 43 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 44 | /* |
| 45 | * The basic unit of block I/O is a sector. It is interpreted in a |
| 46 | * number of contexts in Linux (blk, bio, genhd), but the default is |
| 47 | * universally 512 bytes. These symbols are just slightly more |
| 48 | * meaningful than the bare numbers they represent. |
| 49 | */ |
| 50 | #define SECTOR_SHIFT 9 |
| 51 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) |
| 52 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 53 | #define RBD_DRV_NAME "rbd" |
| 54 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 55 | |
| 56 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ |
| 57 | |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 58 | #define RBD_MAX_MD_NAME_LEN (RBD_MAX_OBJ_NAME_LEN + sizeof(RBD_SUFFIX)) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 59 | #define RBD_MAX_POOL_NAME_LEN 64 |
| 60 | #define RBD_MAX_SNAP_NAME_LEN 32 |
| 61 | #define RBD_MAX_OPT_LEN 1024 |
| 62 | |
| 63 | #define RBD_SNAP_HEAD_NAME "-" |
| 64 | |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 65 | /* |
| 66 | * An RBD device name will be "rbd#", where the "rbd" comes from |
| 67 | * RBD_DRV_NAME above, and # is a unique integer identifier. |
| 68 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big |
| 69 | * enough to hold all possible device names. |
| 70 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 71 | #define DEV_NAME_LEN 32 |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 72 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 73 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 74 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
| 75 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 76 | /* |
| 77 | * block device image metadata (in-memory version) |
| 78 | */ |
| 79 | struct rbd_image_header { |
| 80 | u64 image_size; |
| 81 | char block_name[32]; |
| 82 | __u8 obj_order; |
| 83 | __u8 crypt_type; |
| 84 | __u8 comp_type; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 85 | struct ceph_snap_context *snapc; |
| 86 | size_t snap_names_len; |
| 87 | u64 snap_seq; |
| 88 | u32 total_snaps; |
| 89 | |
| 90 | char *snap_names; |
| 91 | u64 *snap_sizes; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 92 | |
| 93 | u64 obj_version; |
| 94 | }; |
| 95 | |
| 96 | struct rbd_options { |
| 97 | int notify_timeout; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | /* |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 101 | * an instance of the client. multiple devices may share an rbd client. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 102 | */ |
| 103 | struct rbd_client { |
| 104 | struct ceph_client *client; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 105 | struct rbd_options *rbd_opts; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 106 | struct kref kref; |
| 107 | struct list_head node; |
| 108 | }; |
| 109 | |
| 110 | /* |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 111 | * a request completion status |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 112 | */ |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 113 | struct rbd_req_status { |
| 114 | int done; |
| 115 | int rc; |
| 116 | u64 bytes; |
| 117 | }; |
| 118 | |
| 119 | /* |
| 120 | * a collection of requests |
| 121 | */ |
| 122 | struct rbd_req_coll { |
| 123 | int total; |
| 124 | int num_done; |
| 125 | struct kref kref; |
| 126 | struct rbd_req_status status[0]; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 127 | }; |
| 128 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 129 | /* |
| 130 | * a single io request |
| 131 | */ |
| 132 | struct rbd_request { |
| 133 | struct request *rq; /* blk layer request */ |
| 134 | struct bio *bio; /* cloned bio */ |
| 135 | struct page **pages; /* list of used pages */ |
| 136 | u64 len; |
| 137 | int coll_index; |
| 138 | struct rbd_req_coll *coll; |
| 139 | }; |
| 140 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 141 | struct rbd_snap { |
| 142 | struct device dev; |
| 143 | const char *name; |
| 144 | size_t size; |
| 145 | struct list_head node; |
| 146 | u64 id; |
| 147 | }; |
| 148 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 149 | /* |
| 150 | * a single device |
| 151 | */ |
| 152 | struct rbd_device { |
| 153 | int id; /* blkdev unique id */ |
| 154 | |
| 155 | int major; /* blkdev assigned major */ |
| 156 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
| 157 | struct request_queue *q; |
| 158 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 159 | struct rbd_client *rbd_client; |
| 160 | |
| 161 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
| 162 | |
| 163 | spinlock_t lock; /* queue lock */ |
| 164 | |
| 165 | struct rbd_image_header header; |
| 166 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ |
| 167 | int obj_len; |
| 168 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ |
| 169 | char pool_name[RBD_MAX_POOL_NAME_LEN]; |
| 170 | int poolid; |
| 171 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 172 | struct ceph_osd_event *watch_event; |
| 173 | struct ceph_osd_request *watch_request; |
| 174 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 175 | /* protects updating the header */ |
| 176 | struct rw_semaphore header_rwsem; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 177 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; |
Josh Durgin | 77dfe99 | 2011-11-21 13:04:42 -0800 | [diff] [blame] | 178 | u64 snap_id; /* current snapshot id */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 179 | int read_only; |
| 180 | |
| 181 | struct list_head node; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 182 | |
| 183 | /* list of snapshots */ |
| 184 | struct list_head snaps; |
| 185 | |
| 186 | /* sysfs related */ |
| 187 | struct device dev; |
| 188 | }; |
| 189 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 190 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 191 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 192 | static LIST_HEAD(rbd_dev_list); /* devices */ |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 193 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
| 194 | |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 195 | static LIST_HEAD(rbd_client_list); /* clients */ |
| 196 | static DEFINE_SPINLOCK(rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 197 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 198 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
| 199 | static void rbd_dev_release(struct device *dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 200 | static ssize_t rbd_snap_add(struct device *dev, |
| 201 | struct device_attribute *attr, |
| 202 | const char *buf, |
| 203 | size_t count); |
| 204 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, |
Justin P. Mattock | 6993248 | 2011-07-26 23:06:29 -0700 | [diff] [blame] | 205 | struct rbd_snap *snap); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 206 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 207 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
| 208 | size_t count); |
| 209 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, |
| 210 | size_t count); |
| 211 | |
| 212 | static struct bus_attribute rbd_bus_attrs[] = { |
| 213 | __ATTR(add, S_IWUSR, NULL, rbd_add), |
| 214 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), |
| 215 | __ATTR_NULL |
| 216 | }; |
| 217 | |
| 218 | static struct bus_type rbd_bus_type = { |
| 219 | .name = "rbd", |
| 220 | .bus_attrs = rbd_bus_attrs, |
| 221 | }; |
| 222 | |
| 223 | static void rbd_root_dev_release(struct device *dev) |
| 224 | { |
| 225 | } |
| 226 | |
| 227 | static struct device rbd_root_dev = { |
| 228 | .init_name = "rbd", |
| 229 | .release = rbd_root_dev_release, |
| 230 | }; |
| 231 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 232 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 233 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
| 234 | { |
| 235 | return get_device(&rbd_dev->dev); |
| 236 | } |
| 237 | |
| 238 | static void rbd_put_dev(struct rbd_device *rbd_dev) |
| 239 | { |
| 240 | put_device(&rbd_dev->dev); |
| 241 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 242 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 243 | static int __rbd_update_snaps(struct rbd_device *rbd_dev); |
| 244 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 245 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
| 246 | { |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 247 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 248 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 249 | rbd_get_dev(rbd_dev); |
| 250 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 251 | set_device_ro(bdev, rbd_dev->read_only); |
| 252 | |
| 253 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
| 254 | return -EROFS; |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 259 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
| 260 | { |
| 261 | struct rbd_device *rbd_dev = disk->private_data; |
| 262 | |
| 263 | rbd_put_dev(rbd_dev); |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 268 | static const struct block_device_operations rbd_bd_ops = { |
| 269 | .owner = THIS_MODULE, |
| 270 | .open = rbd_open, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 271 | .release = rbd_release, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 272 | }; |
| 273 | |
| 274 | /* |
| 275 | * Initialize an rbd client instance. |
| 276 | * We own *opt. |
| 277 | */ |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 278 | static struct rbd_client *rbd_client_create(struct ceph_options *opt, |
| 279 | struct rbd_options *rbd_opts) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 280 | { |
| 281 | struct rbd_client *rbdc; |
| 282 | int ret = -ENOMEM; |
| 283 | |
| 284 | dout("rbd_client_create\n"); |
| 285 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| 286 | if (!rbdc) |
| 287 | goto out_opt; |
| 288 | |
| 289 | kref_init(&rbdc->kref); |
| 290 | INIT_LIST_HEAD(&rbdc->node); |
| 291 | |
Alex Elder | bc534d8 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 292 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 293 | |
Sage Weil | 6ab00d4 | 2011-08-09 09:41:59 -0700 | [diff] [blame] | 294 | rbdc->client = ceph_create_client(opt, rbdc, 0, 0); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 295 | if (IS_ERR(rbdc->client)) |
Alex Elder | bc534d8 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 296 | goto out_mutex; |
Vasiliy Kulikov | 28f259b | 2010-09-26 12:59:37 +0400 | [diff] [blame] | 297 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 298 | |
| 299 | ret = ceph_open_session(rbdc->client); |
| 300 | if (ret < 0) |
| 301 | goto out_err; |
| 302 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 303 | rbdc->rbd_opts = rbd_opts; |
| 304 | |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 305 | spin_lock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 306 | list_add_tail(&rbdc->node, &rbd_client_list); |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 307 | spin_unlock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 308 | |
Alex Elder | bc534d8 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 309 | mutex_unlock(&ctl_mutex); |
| 310 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 311 | dout("rbd_client_create created %p\n", rbdc); |
| 312 | return rbdc; |
| 313 | |
| 314 | out_err: |
| 315 | ceph_destroy_client(rbdc->client); |
Alex Elder | bc534d8 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 316 | out_mutex: |
| 317 | mutex_unlock(&ctl_mutex); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 318 | kfree(rbdc); |
| 319 | out_opt: |
Vasiliy Kulikov | 28f259b | 2010-09-26 12:59:37 +0400 | [diff] [blame] | 320 | if (opt) |
| 321 | ceph_destroy_options(opt); |
| 322 | return ERR_PTR(ret); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Find a ceph client with specific addr and configuration. |
| 327 | */ |
| 328 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) |
| 329 | { |
| 330 | struct rbd_client *client_node; |
| 331 | |
| 332 | if (opt->flags & CEPH_OPT_NOSHARE) |
| 333 | return NULL; |
| 334 | |
| 335 | list_for_each_entry(client_node, &rbd_client_list, node) |
| 336 | if (ceph_compare_options(opt, client_node->client) == 0) |
| 337 | return client_node; |
| 338 | return NULL; |
| 339 | } |
| 340 | |
| 341 | /* |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 342 | * mount options |
| 343 | */ |
| 344 | enum { |
| 345 | Opt_notify_timeout, |
| 346 | Opt_last_int, |
| 347 | /* int args above */ |
| 348 | Opt_last_string, |
| 349 | /* string args above */ |
| 350 | }; |
| 351 | |
| 352 | static match_table_t rbdopt_tokens = { |
| 353 | {Opt_notify_timeout, "notify_timeout=%d"}, |
| 354 | /* int args above */ |
| 355 | /* string args above */ |
| 356 | {-1, NULL} |
| 357 | }; |
| 358 | |
| 359 | static int parse_rbd_opts_token(char *c, void *private) |
| 360 | { |
| 361 | struct rbd_options *rbdopt = private; |
| 362 | substring_t argstr[MAX_OPT_ARGS]; |
| 363 | int token, intval, ret; |
| 364 | |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 365 | token = match_token(c, rbdopt_tokens, argstr); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 366 | if (token < 0) |
| 367 | return -EINVAL; |
| 368 | |
| 369 | if (token < Opt_last_int) { |
| 370 | ret = match_int(&argstr[0], &intval); |
| 371 | if (ret < 0) { |
| 372 | pr_err("bad mount option arg (not int) " |
| 373 | "at '%s'\n", c); |
| 374 | return ret; |
| 375 | } |
| 376 | dout("got int token %d val %d\n", token, intval); |
| 377 | } else if (token > Opt_last_int && token < Opt_last_string) { |
| 378 | dout("got string token %d val %s\n", token, |
| 379 | argstr[0].from); |
| 380 | } else { |
| 381 | dout("got token %d\n", token); |
| 382 | } |
| 383 | |
| 384 | switch (token) { |
| 385 | case Opt_notify_timeout: |
| 386 | rbdopt->notify_timeout = intval; |
| 387 | break; |
| 388 | default: |
| 389 | BUG_ON(token); |
| 390 | } |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | /* |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 395 | * Get a ceph client with specific addr and configuration, if one does |
| 396 | * not exist create it. |
| 397 | */ |
Alex Elder | 5214ecc | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 398 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
| 399 | size_t mon_addr_len, |
| 400 | char *options) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 401 | { |
| 402 | struct rbd_client *rbdc; |
| 403 | struct ceph_options *opt; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 404 | struct rbd_options *rbd_opts; |
| 405 | |
| 406 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); |
| 407 | if (!rbd_opts) |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 408 | return ERR_PTR(-ENOMEM); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 409 | |
| 410 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 411 | |
Alex Elder | ee57741 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 412 | opt = ceph_parse_options(options, mon_addr, |
Alex Elder | 5214ecc | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 413 | mon_addr + mon_addr_len, |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 414 | parse_rbd_opts_token, rbd_opts); |
Alex Elder | ee57741 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 415 | if (IS_ERR(opt)) { |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 416 | kfree(rbd_opts); |
| 417 | return ERR_CAST(opt); |
Alex Elder | ee57741 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 418 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 419 | |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 420 | spin_lock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 421 | rbdc = __rbd_client_find(opt); |
| 422 | if (rbdc) { |
Alex Elder | e6994d3 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 423 | /* using an existing client */ |
| 424 | kref_get(&rbdc->kref); |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 425 | spin_unlock(&rbd_client_list_lock); |
Alex Elder | e6994d3 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 426 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 427 | ceph_destroy_options(opt); |
Alex Elder | 97bb59a | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 428 | kfree(rbd_opts); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 429 | |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 430 | return rbdc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 431 | } |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 432 | spin_unlock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 433 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 434 | rbdc = rbd_client_create(opt, rbd_opts); |
Alex Elder | d97081b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 435 | |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 436 | if (IS_ERR(rbdc)) |
| 437 | kfree(rbd_opts); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 438 | |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 439 | return rbdc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | /* |
| 443 | * Destroy ceph client |
Alex Elder | d23a4b3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 444 | * |
Alex Elder | 432b858 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 445 | * Caller must hold rbd_client_list_lock. |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 446 | */ |
| 447 | static void rbd_client_release(struct kref *kref) |
| 448 | { |
| 449 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
| 450 | |
| 451 | dout("rbd_release_client %p\n", rbdc); |
Alex Elder | cd9d9f5 | 2012-04-04 13:35:44 -0500 | [diff] [blame] | 452 | spin_lock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 453 | list_del(&rbdc->node); |
Alex Elder | cd9d9f5 | 2012-04-04 13:35:44 -0500 | [diff] [blame] | 454 | spin_unlock(&rbd_client_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 455 | |
| 456 | ceph_destroy_client(rbdc->client); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 457 | kfree(rbdc->rbd_opts); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 458 | kfree(rbdc); |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Drop reference to ceph client node. If it's not referenced anymore, release |
| 463 | * it. |
| 464 | */ |
| 465 | static void rbd_put_client(struct rbd_device *rbd_dev) |
| 466 | { |
| 467 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); |
| 468 | rbd_dev->rbd_client = NULL; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 469 | } |
| 470 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 471 | /* |
| 472 | * Destroy requests collection |
| 473 | */ |
| 474 | static void rbd_coll_release(struct kref *kref) |
| 475 | { |
| 476 | struct rbd_req_coll *coll = |
| 477 | container_of(kref, struct rbd_req_coll, kref); |
| 478 | |
| 479 | dout("rbd_coll_release %p\n", coll); |
| 480 | kfree(coll); |
| 481 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 482 | |
| 483 | /* |
| 484 | * Create a new header structure, translate header format from the on-disk |
| 485 | * header. |
| 486 | */ |
| 487 | static int rbd_header_from_disk(struct rbd_image_header *header, |
| 488 | struct rbd_image_header_ondisk *ondisk, |
Xi Wang | 50f7c4c | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 489 | u32 allocated_snaps, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 490 | gfp_t gfp_flags) |
| 491 | { |
Xi Wang | 50f7c4c | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 492 | u32 i, snap_count; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 493 | |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 494 | if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) |
Josh Durgin | 81e759f | 2011-11-15 14:49:53 -0800 | [diff] [blame] | 495 | return -ENXIO; |
Josh Durgin | 81e759f | 2011-11-15 14:49:53 -0800 | [diff] [blame] | 496 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 497 | snap_count = le32_to_cpu(ondisk->snap_count); |
Xi Wang | 50f7c4c | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 498 | if (snap_count > (UINT_MAX - sizeof(struct ceph_snap_context)) |
| 499 | / sizeof (*ondisk)) |
| 500 | return -EINVAL; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 501 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 502 | snap_count * sizeof (*ondisk), |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 503 | gfp_flags); |
| 504 | if (!header->snapc) |
| 505 | return -ENOMEM; |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 506 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 507 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 508 | if (snap_count) { |
| 509 | header->snap_names = kmalloc(header->snap_names_len, |
Dan Carpenter | f8ad495 | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 510 | gfp_flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 511 | if (!header->snap_names) |
| 512 | goto err_snapc; |
| 513 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), |
Dan Carpenter | f8ad495 | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 514 | gfp_flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 515 | if (!header->snap_sizes) |
| 516 | goto err_names; |
| 517 | } else { |
| 518 | header->snap_names = NULL; |
| 519 | header->snap_sizes = NULL; |
| 520 | } |
| 521 | memcpy(header->block_name, ondisk->block_name, |
| 522 | sizeof(ondisk->block_name)); |
| 523 | |
| 524 | header->image_size = le64_to_cpu(ondisk->image_size); |
| 525 | header->obj_order = ondisk->options.order; |
| 526 | header->crypt_type = ondisk->options.crypt_type; |
| 527 | header->comp_type = ondisk->options.comp_type; |
| 528 | |
| 529 | atomic_set(&header->snapc->nref, 1); |
| 530 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); |
| 531 | header->snapc->num_snaps = snap_count; |
| 532 | header->total_snaps = snap_count; |
| 533 | |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 534 | if (snap_count && allocated_snaps == snap_count) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 535 | for (i = 0; i < snap_count; i++) { |
| 536 | header->snapc->snaps[i] = |
| 537 | le64_to_cpu(ondisk->snaps[i].id); |
| 538 | header->snap_sizes[i] = |
| 539 | le64_to_cpu(ondisk->snaps[i].image_size); |
| 540 | } |
| 541 | |
| 542 | /* copy snapshot names */ |
| 543 | memcpy(header->snap_names, &ondisk->snaps[i], |
| 544 | header->snap_names_len); |
| 545 | } |
| 546 | |
| 547 | return 0; |
| 548 | |
| 549 | err_names: |
| 550 | kfree(header->snap_names); |
| 551 | err_snapc: |
| 552 | kfree(header->snapc); |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 553 | return -ENOMEM; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 556 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
| 557 | u64 *seq, u64 *size) |
| 558 | { |
| 559 | int i; |
| 560 | char *p = header->snap_names; |
| 561 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 562 | for (i = 0; i < header->total_snaps; i++) { |
| 563 | if (!strcmp(snap_name, p)) { |
| 564 | |
| 565 | /* Found it. Pass back its id and/or size */ |
| 566 | |
| 567 | if (seq) |
| 568 | *seq = header->snapc->snaps[i]; |
| 569 | if (size) |
| 570 | *size = header->snap_sizes[i]; |
| 571 | return i; |
| 572 | } |
| 573 | p += strlen(p) + 1; /* Skip ahead to the next name */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 574 | } |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 575 | return -ENOENT; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Josh Durgin | cc9d734 | 2011-11-21 18:19:13 -0800 | [diff] [blame] | 578 | static int rbd_header_set_snap(struct rbd_device *dev, u64 *size) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 579 | { |
| 580 | struct rbd_image_header *header = &dev->header; |
| 581 | struct ceph_snap_context *snapc = header->snapc; |
| 582 | int ret = -ENOENT; |
| 583 | |
Josh Durgin | cc9d734 | 2011-11-21 18:19:13 -0800 | [diff] [blame] | 584 | BUILD_BUG_ON(sizeof (dev->snap_name) < sizeof (RBD_SNAP_HEAD_NAME)); |
| 585 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 586 | down_write(&dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 587 | |
Josh Durgin | cc9d734 | 2011-11-21 18:19:13 -0800 | [diff] [blame] | 588 | if (!memcmp(dev->snap_name, RBD_SNAP_HEAD_NAME, |
| 589 | sizeof (RBD_SNAP_HEAD_NAME))) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 590 | if (header->total_snaps) |
| 591 | snapc->seq = header->snap_seq; |
| 592 | else |
| 593 | snapc->seq = 0; |
Josh Durgin | 77dfe99 | 2011-11-21 13:04:42 -0800 | [diff] [blame] | 594 | dev->snap_id = CEPH_NOSNAP; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 595 | dev->read_only = 0; |
| 596 | if (size) |
| 597 | *size = header->image_size; |
| 598 | } else { |
Josh Durgin | cc9d734 | 2011-11-21 18:19:13 -0800 | [diff] [blame] | 599 | ret = snap_by_name(header, dev->snap_name, &snapc->seq, size); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 600 | if (ret < 0) |
| 601 | goto done; |
Josh Durgin | 77dfe99 | 2011-11-21 13:04:42 -0800 | [diff] [blame] | 602 | dev->snap_id = snapc->seq; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 603 | dev->read_only = 1; |
| 604 | } |
| 605 | |
| 606 | ret = 0; |
| 607 | done: |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 608 | up_write(&dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 609 | return ret; |
| 610 | } |
| 611 | |
| 612 | static void rbd_header_free(struct rbd_image_header *header) |
| 613 | { |
| 614 | kfree(header->snapc); |
| 615 | kfree(header->snap_names); |
| 616 | kfree(header->snap_sizes); |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * get the actual striped segment name, offset and length |
| 621 | */ |
| 622 | static u64 rbd_get_segment(struct rbd_image_header *header, |
| 623 | const char *block_name, |
| 624 | u64 ofs, u64 len, |
| 625 | char *seg_name, u64 *segofs) |
| 626 | { |
| 627 | u64 seg = ofs >> header->obj_order; |
| 628 | |
| 629 | if (seg_name) |
| 630 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, |
| 631 | "%s.%012llx", block_name, seg); |
| 632 | |
| 633 | ofs = ofs & ((1 << header->obj_order) - 1); |
| 634 | len = min_t(u64, len, (1 << header->obj_order) - ofs); |
| 635 | |
| 636 | if (segofs) |
| 637 | *segofs = ofs; |
| 638 | |
| 639 | return len; |
| 640 | } |
| 641 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 642 | static int rbd_get_num_segments(struct rbd_image_header *header, |
| 643 | u64 ofs, u64 len) |
| 644 | { |
| 645 | u64 start_seg = ofs >> header->obj_order; |
| 646 | u64 end_seg = (ofs + len - 1) >> header->obj_order; |
| 647 | return end_seg - start_seg + 1; |
| 648 | } |
| 649 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 650 | /* |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 651 | * returns the size of an object in the image |
| 652 | */ |
| 653 | static u64 rbd_obj_bytes(struct rbd_image_header *header) |
| 654 | { |
| 655 | return 1 << header->obj_order; |
| 656 | } |
| 657 | |
| 658 | /* |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 659 | * bio helpers |
| 660 | */ |
| 661 | |
| 662 | static void bio_chain_put(struct bio *chain) |
| 663 | { |
| 664 | struct bio *tmp; |
| 665 | |
| 666 | while (chain) { |
| 667 | tmp = chain; |
| 668 | chain = chain->bi_next; |
| 669 | bio_put(tmp); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | /* |
| 674 | * zeros a bio chain, starting at specific offset |
| 675 | */ |
| 676 | static void zero_bio_chain(struct bio *chain, int start_ofs) |
| 677 | { |
| 678 | struct bio_vec *bv; |
| 679 | unsigned long flags; |
| 680 | void *buf; |
| 681 | int i; |
| 682 | int pos = 0; |
| 683 | |
| 684 | while (chain) { |
| 685 | bio_for_each_segment(bv, chain, i) { |
| 686 | if (pos + bv->bv_len > start_ofs) { |
| 687 | int remainder = max(start_ofs - pos, 0); |
| 688 | buf = bvec_kmap_irq(bv, &flags); |
| 689 | memset(buf + remainder, 0, |
| 690 | bv->bv_len - remainder); |
Dan Carpenter | 85b5aaa | 2010-10-11 21:15:11 +0200 | [diff] [blame] | 691 | bvec_kunmap_irq(buf, &flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 692 | } |
| 693 | pos += bv->bv_len; |
| 694 | } |
| 695 | |
| 696 | chain = chain->bi_next; |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * bio_chain_clone - clone a chain of bios up to a certain length. |
| 702 | * might return a bio_pair that will need to be released. |
| 703 | */ |
| 704 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, |
| 705 | struct bio_pair **bp, |
| 706 | int len, gfp_t gfpmask) |
| 707 | { |
| 708 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; |
| 709 | int total = 0; |
| 710 | |
| 711 | if (*bp) { |
| 712 | bio_pair_release(*bp); |
| 713 | *bp = NULL; |
| 714 | } |
| 715 | |
| 716 | while (old_chain && (total < len)) { |
| 717 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
| 718 | if (!tmp) |
| 719 | goto err_out; |
| 720 | |
| 721 | if (total + old_chain->bi_size > len) { |
| 722 | struct bio_pair *bp; |
| 723 | |
| 724 | /* |
| 725 | * this split can only happen with a single paged bio, |
| 726 | * split_bio will BUG_ON if this is not the case |
| 727 | */ |
| 728 | dout("bio_chain_clone split! total=%d remaining=%d" |
| 729 | "bi_size=%d\n", |
| 730 | (int)total, (int)len-total, |
| 731 | (int)old_chain->bi_size); |
| 732 | |
| 733 | /* split the bio. We'll release it either in the next |
| 734 | call, or it will have to be released outside */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 735 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 736 | if (!bp) |
| 737 | goto err_out; |
| 738 | |
| 739 | __bio_clone(tmp, &bp->bio1); |
| 740 | |
| 741 | *next = &bp->bio2; |
| 742 | } else { |
| 743 | __bio_clone(tmp, old_chain); |
| 744 | *next = old_chain->bi_next; |
| 745 | } |
| 746 | |
| 747 | tmp->bi_bdev = NULL; |
| 748 | gfpmask &= ~__GFP_WAIT; |
| 749 | tmp->bi_next = NULL; |
| 750 | |
| 751 | if (!new_chain) { |
| 752 | new_chain = tail = tmp; |
| 753 | } else { |
| 754 | tail->bi_next = tmp; |
| 755 | tail = tmp; |
| 756 | } |
| 757 | old_chain = old_chain->bi_next; |
| 758 | |
| 759 | total += tmp->bi_size; |
| 760 | } |
| 761 | |
| 762 | BUG_ON(total < len); |
| 763 | |
| 764 | if (tail) |
| 765 | tail->bi_next = NULL; |
| 766 | |
| 767 | *old = old_chain; |
| 768 | |
| 769 | return new_chain; |
| 770 | |
| 771 | err_out: |
| 772 | dout("bio_chain_clone with err\n"); |
| 773 | bio_chain_put(new_chain); |
| 774 | return NULL; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * helpers for osd request op vectors. |
| 779 | */ |
| 780 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, |
| 781 | int num_ops, |
| 782 | int opcode, |
| 783 | u32 payload_len) |
| 784 | { |
| 785 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), |
| 786 | GFP_NOIO); |
| 787 | if (!*ops) |
| 788 | return -ENOMEM; |
| 789 | (*ops)[0].op = opcode; |
| 790 | /* |
| 791 | * op extent offset and length will be set later on |
| 792 | * in calc_raw_layout() |
| 793 | */ |
| 794 | (*ops)[0].payload_len = payload_len; |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) |
| 799 | { |
| 800 | kfree(ops); |
| 801 | } |
| 802 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 803 | static void rbd_coll_end_req_index(struct request *rq, |
| 804 | struct rbd_req_coll *coll, |
| 805 | int index, |
| 806 | int ret, u64 len) |
| 807 | { |
| 808 | struct request_queue *q; |
| 809 | int min, max, i; |
| 810 | |
| 811 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", |
| 812 | coll, index, ret, len); |
| 813 | |
| 814 | if (!rq) |
| 815 | return; |
| 816 | |
| 817 | if (!coll) { |
| 818 | blk_end_request(rq, ret, len); |
| 819 | return; |
| 820 | } |
| 821 | |
| 822 | q = rq->q; |
| 823 | |
| 824 | spin_lock_irq(q->queue_lock); |
| 825 | coll->status[index].done = 1; |
| 826 | coll->status[index].rc = ret; |
| 827 | coll->status[index].bytes = len; |
| 828 | max = min = coll->num_done; |
| 829 | while (max < coll->total && coll->status[max].done) |
| 830 | max++; |
| 831 | |
| 832 | for (i = min; i<max; i++) { |
| 833 | __blk_end_request(rq, coll->status[i].rc, |
| 834 | coll->status[i].bytes); |
| 835 | coll->num_done++; |
| 836 | kref_put(&coll->kref, rbd_coll_release); |
| 837 | } |
| 838 | spin_unlock_irq(q->queue_lock); |
| 839 | } |
| 840 | |
| 841 | static void rbd_coll_end_req(struct rbd_request *req, |
| 842 | int ret, u64 len) |
| 843 | { |
| 844 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); |
| 845 | } |
| 846 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 847 | /* |
| 848 | * Send ceph osd request |
| 849 | */ |
| 850 | static int rbd_do_request(struct request *rq, |
| 851 | struct rbd_device *dev, |
| 852 | struct ceph_snap_context *snapc, |
| 853 | u64 snapid, |
| 854 | const char *obj, u64 ofs, u64 len, |
| 855 | struct bio *bio, |
| 856 | struct page **pages, |
| 857 | int num_pages, |
| 858 | int flags, |
| 859 | struct ceph_osd_req_op *ops, |
| 860 | int num_reply, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 861 | struct rbd_req_coll *coll, |
| 862 | int coll_index, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 863 | void (*rbd_cb)(struct ceph_osd_request *req, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 864 | struct ceph_msg *msg), |
| 865 | struct ceph_osd_request **linger_req, |
| 866 | u64 *ver) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 867 | { |
| 868 | struct ceph_osd_request *req; |
| 869 | struct ceph_file_layout *layout; |
| 870 | int ret; |
| 871 | u64 bno; |
| 872 | struct timespec mtime = CURRENT_TIME; |
| 873 | struct rbd_request *req_data; |
| 874 | struct ceph_osd_request_head *reqhead; |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 875 | struct ceph_osd_client *osdc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 876 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 877 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 878 | if (!req_data) { |
| 879 | if (coll) |
| 880 | rbd_coll_end_req_index(rq, coll, coll_index, |
| 881 | -ENOMEM, len); |
| 882 | return -ENOMEM; |
| 883 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 884 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 885 | if (coll) { |
| 886 | req_data->coll = coll; |
| 887 | req_data->coll_index = coll_index; |
| 888 | } |
| 889 | |
| 890 | dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 891 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 892 | down_read(&dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 893 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 894 | osdc = &dev->rbd_client->client->osdc; |
| 895 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
| 896 | false, GFP_NOIO, pages, bio); |
Sage Weil | 4ad1262 | 2011-05-03 09:23:36 -0700 | [diff] [blame] | 897 | if (!req) { |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 898 | up_read(&dev->header_rwsem); |
Sage Weil | 4ad1262 | 2011-05-03 09:23:36 -0700 | [diff] [blame] | 899 | ret = -ENOMEM; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 900 | goto done_pages; |
| 901 | } |
| 902 | |
| 903 | req->r_callback = rbd_cb; |
| 904 | |
| 905 | req_data->rq = rq; |
| 906 | req_data->bio = bio; |
| 907 | req_data->pages = pages; |
| 908 | req_data->len = len; |
| 909 | |
| 910 | req->r_priv = req_data; |
| 911 | |
| 912 | reqhead = req->r_request->front.iov_base; |
| 913 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); |
| 914 | |
| 915 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); |
| 916 | req->r_oid_len = strlen(req->r_oid); |
| 917 | |
| 918 | layout = &req->r_file_layout; |
| 919 | memset(layout, 0, sizeof(*layout)); |
| 920 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| 921 | layout->fl_stripe_count = cpu_to_le32(1); |
| 922 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 923 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 924 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
| 925 | req, ops); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 926 | |
| 927 | ceph_osdc_build_request(req, ofs, &len, |
| 928 | ops, |
| 929 | snapc, |
| 930 | &mtime, |
| 931 | req->r_oid, req->r_oid_len); |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 932 | up_read(&dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 933 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 934 | if (linger_req) { |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 935 | ceph_osdc_set_request_linger(osdc, req); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 936 | *linger_req = req; |
| 937 | } |
| 938 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 939 | ret = ceph_osdc_start_request(osdc, req, false); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 940 | if (ret < 0) |
| 941 | goto done_err; |
| 942 | |
| 943 | if (!rbd_cb) { |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 944 | ret = ceph_osdc_wait_request(osdc, req); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 945 | if (ver) |
| 946 | *ver = le64_to_cpu(req->r_reassert_version.version); |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 947 | dout("reassert_ver=%lld\n", |
| 948 | le64_to_cpu(req->r_reassert_version.version)); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 949 | ceph_osdc_put_request(req); |
| 950 | } |
| 951 | return ret; |
| 952 | |
| 953 | done_err: |
| 954 | bio_chain_put(req_data->bio); |
| 955 | ceph_osdc_put_request(req); |
| 956 | done_pages: |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 957 | rbd_coll_end_req(req_data, ret, len); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 958 | kfree(req_data); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 959 | return ret; |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * Ceph osd op callback |
| 964 | */ |
| 965 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
| 966 | { |
| 967 | struct rbd_request *req_data = req->r_priv; |
| 968 | struct ceph_osd_reply_head *replyhead; |
| 969 | struct ceph_osd_op *op; |
| 970 | __s32 rc; |
| 971 | u64 bytes; |
| 972 | int read_op; |
| 973 | |
| 974 | /* parse reply */ |
| 975 | replyhead = msg->front.iov_base; |
| 976 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); |
| 977 | op = (void *)(replyhead + 1); |
| 978 | rc = le32_to_cpu(replyhead->result); |
| 979 | bytes = le64_to_cpu(op->extent.length); |
| 980 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); |
| 981 | |
| 982 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); |
| 983 | |
| 984 | if (rc == -ENOENT && read_op) { |
| 985 | zero_bio_chain(req_data->bio, 0); |
| 986 | rc = 0; |
| 987 | } else if (rc == 0 && read_op && bytes < req_data->len) { |
| 988 | zero_bio_chain(req_data->bio, bytes); |
| 989 | bytes = req_data->len; |
| 990 | } |
| 991 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 992 | rbd_coll_end_req(req_data, rc, bytes); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 993 | |
| 994 | if (req_data->bio) |
| 995 | bio_chain_put(req_data->bio); |
| 996 | |
| 997 | ceph_osdc_put_request(req); |
| 998 | kfree(req_data); |
| 999 | } |
| 1000 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1001 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
| 1002 | { |
| 1003 | ceph_osdc_put_request(req); |
| 1004 | } |
| 1005 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1006 | /* |
| 1007 | * Do a synchronous ceph osd operation |
| 1008 | */ |
| 1009 | static int rbd_req_sync_op(struct rbd_device *dev, |
| 1010 | struct ceph_snap_context *snapc, |
| 1011 | u64 snapid, |
| 1012 | int opcode, |
| 1013 | int flags, |
| 1014 | struct ceph_osd_req_op *orig_ops, |
| 1015 | int num_reply, |
| 1016 | const char *obj, |
| 1017 | u64 ofs, u64 len, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1018 | char *buf, |
| 1019 | struct ceph_osd_request **linger_req, |
| 1020 | u64 *ver) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1021 | { |
| 1022 | int ret; |
| 1023 | struct page **pages; |
| 1024 | int num_pages; |
| 1025 | struct ceph_osd_req_op *ops = orig_ops; |
| 1026 | u32 payload_len; |
| 1027 | |
| 1028 | num_pages = calc_pages_for(ofs , len); |
| 1029 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
Dan Carpenter | b8d0638 | 2010-10-11 21:14:23 +0200 | [diff] [blame] | 1030 | if (IS_ERR(pages)) |
| 1031 | return PTR_ERR(pages); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1032 | |
| 1033 | if (!orig_ops) { |
| 1034 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); |
| 1035 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); |
| 1036 | if (ret < 0) |
| 1037 | goto done; |
| 1038 | |
| 1039 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { |
| 1040 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); |
| 1041 | if (ret < 0) |
| 1042 | goto done_ops; |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | ret = rbd_do_request(NULL, dev, snapc, snapid, |
| 1047 | obj, ofs, len, NULL, |
| 1048 | pages, num_pages, |
| 1049 | flags, |
| 1050 | ops, |
| 1051 | 2, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1052 | NULL, 0, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1053 | NULL, |
| 1054 | linger_req, ver); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1055 | if (ret < 0) |
| 1056 | goto done_ops; |
| 1057 | |
| 1058 | if ((flags & CEPH_OSD_FLAG_READ) && buf) |
| 1059 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); |
| 1060 | |
| 1061 | done_ops: |
| 1062 | if (!orig_ops) |
| 1063 | rbd_destroy_ops(ops); |
| 1064 | done: |
| 1065 | ceph_release_page_vector(pages, num_pages); |
| 1066 | return ret; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * Do an asynchronous ceph osd operation |
| 1071 | */ |
| 1072 | static int rbd_do_op(struct request *rq, |
| 1073 | struct rbd_device *rbd_dev , |
| 1074 | struct ceph_snap_context *snapc, |
| 1075 | u64 snapid, |
| 1076 | int opcode, int flags, int num_reply, |
| 1077 | u64 ofs, u64 len, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1078 | struct bio *bio, |
| 1079 | struct rbd_req_coll *coll, |
| 1080 | int coll_index) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1081 | { |
| 1082 | char *seg_name; |
| 1083 | u64 seg_ofs; |
| 1084 | u64 seg_len; |
| 1085 | int ret; |
| 1086 | struct ceph_osd_req_op *ops; |
| 1087 | u32 payload_len; |
| 1088 | |
| 1089 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
| 1090 | if (!seg_name) |
| 1091 | return -ENOMEM; |
| 1092 | |
| 1093 | seg_len = rbd_get_segment(&rbd_dev->header, |
| 1094 | rbd_dev->header.block_name, |
| 1095 | ofs, len, |
| 1096 | seg_name, &seg_ofs); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1097 | |
| 1098 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); |
| 1099 | |
| 1100 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); |
| 1101 | if (ret < 0) |
| 1102 | goto done; |
| 1103 | |
| 1104 | /* we've taken care of segment sizes earlier when we |
| 1105 | cloned the bios. We should never have a segment |
| 1106 | truncated at this point */ |
| 1107 | BUG_ON(seg_len < len); |
| 1108 | |
| 1109 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, |
| 1110 | seg_name, seg_ofs, seg_len, |
| 1111 | bio, |
| 1112 | NULL, 0, |
| 1113 | flags, |
| 1114 | ops, |
| 1115 | num_reply, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1116 | coll, coll_index, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1117 | rbd_req_cb, 0, NULL); |
Sage Weil | 11f7700 | 2011-05-12 16:13:54 -0700 | [diff] [blame] | 1118 | |
| 1119 | rbd_destroy_ops(ops); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1120 | done: |
| 1121 | kfree(seg_name); |
| 1122 | return ret; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Request async osd write |
| 1127 | */ |
| 1128 | static int rbd_req_write(struct request *rq, |
| 1129 | struct rbd_device *rbd_dev, |
| 1130 | struct ceph_snap_context *snapc, |
| 1131 | u64 ofs, u64 len, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1132 | struct bio *bio, |
| 1133 | struct rbd_req_coll *coll, |
| 1134 | int coll_index) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1135 | { |
| 1136 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, |
| 1137 | CEPH_OSD_OP_WRITE, |
| 1138 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1139 | 2, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1140 | ofs, len, bio, coll, coll_index); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Request async osd read |
| 1145 | */ |
| 1146 | static int rbd_req_read(struct request *rq, |
| 1147 | struct rbd_device *rbd_dev, |
| 1148 | u64 snapid, |
| 1149 | u64 ofs, u64 len, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1150 | struct bio *bio, |
| 1151 | struct rbd_req_coll *coll, |
| 1152 | int coll_index) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1153 | { |
| 1154 | return rbd_do_op(rq, rbd_dev, NULL, |
Josh Durgin | b06e6a6 | 2011-11-21 18:16:52 -0800 | [diff] [blame^] | 1155 | snapid, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1156 | CEPH_OSD_OP_READ, |
| 1157 | CEPH_OSD_FLAG_READ, |
| 1158 | 2, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1159 | ofs, len, bio, coll, coll_index); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * Request sync osd read |
| 1164 | */ |
| 1165 | static int rbd_req_sync_read(struct rbd_device *dev, |
| 1166 | struct ceph_snap_context *snapc, |
| 1167 | u64 snapid, |
| 1168 | const char *obj, |
| 1169 | u64 ofs, u64 len, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1170 | char *buf, |
| 1171 | u64 *ver) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1172 | { |
| 1173 | return rbd_req_sync_op(dev, NULL, |
Josh Durgin | b06e6a6 | 2011-11-21 18:16:52 -0800 | [diff] [blame^] | 1174 | snapid, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1175 | CEPH_OSD_OP_READ, |
| 1176 | CEPH_OSD_FLAG_READ, |
| 1177 | NULL, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1178 | 1, obj, ofs, len, buf, NULL, ver); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | /* |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1182 | * Request sync osd watch |
| 1183 | */ |
| 1184 | static int rbd_req_sync_notify_ack(struct rbd_device *dev, |
| 1185 | u64 ver, |
| 1186 | u64 notify_id, |
| 1187 | const char *obj) |
| 1188 | { |
| 1189 | struct ceph_osd_req_op *ops; |
| 1190 | struct page **pages = NULL; |
Sage Weil | 11f7700 | 2011-05-12 16:13:54 -0700 | [diff] [blame] | 1191 | int ret; |
| 1192 | |
| 1193 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1194 | if (ret < 0) |
| 1195 | return ret; |
| 1196 | |
| 1197 | ops[0].watch.ver = cpu_to_le64(dev->header.obj_version); |
| 1198 | ops[0].watch.cookie = notify_id; |
| 1199 | ops[0].watch.flag = 0; |
| 1200 | |
| 1201 | ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP, |
| 1202 | obj, 0, 0, NULL, |
| 1203 | pages, 0, |
| 1204 | CEPH_OSD_FLAG_READ, |
| 1205 | ops, |
| 1206 | 1, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1207 | NULL, 0, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1208 | rbd_simple_req_cb, 0, NULL); |
| 1209 | |
| 1210 | rbd_destroy_ops(ops); |
| 1211 | return ret; |
| 1212 | } |
| 1213 | |
| 1214 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) |
| 1215 | { |
| 1216 | struct rbd_device *dev = (struct rbd_device *)data; |
Sage Weil | 13143d2 | 2011-05-12 16:08:30 -0700 | [diff] [blame] | 1217 | int rc; |
| 1218 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1219 | if (!dev) |
| 1220 | return; |
| 1221 | |
| 1222 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, |
| 1223 | notify_id, (int)opcode); |
| 1224 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Sage Weil | 13143d2 | 2011-05-12 16:08:30 -0700 | [diff] [blame] | 1225 | rc = __rbd_update_snaps(dev); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1226 | mutex_unlock(&ctl_mutex); |
Sage Weil | 13143d2 | 2011-05-12 16:08:30 -0700 | [diff] [blame] | 1227 | if (rc) |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 1228 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
| 1229 | " update snaps: %d\n", dev->major, rc); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1230 | |
| 1231 | rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name); |
| 1232 | } |
| 1233 | |
| 1234 | /* |
| 1235 | * Request sync osd watch |
| 1236 | */ |
| 1237 | static int rbd_req_sync_watch(struct rbd_device *dev, |
| 1238 | const char *obj, |
| 1239 | u64 ver) |
| 1240 | { |
| 1241 | struct ceph_osd_req_op *ops; |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 1242 | struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1243 | |
| 1244 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); |
| 1245 | if (ret < 0) |
| 1246 | return ret; |
| 1247 | |
| 1248 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, |
| 1249 | (void *)dev, &dev->watch_event); |
| 1250 | if (ret < 0) |
| 1251 | goto fail; |
| 1252 | |
| 1253 | ops[0].watch.ver = cpu_to_le64(ver); |
| 1254 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); |
| 1255 | ops[0].watch.flag = 1; |
| 1256 | |
| 1257 | ret = rbd_req_sync_op(dev, NULL, |
| 1258 | CEPH_NOSNAP, |
| 1259 | 0, |
| 1260 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1261 | ops, |
| 1262 | 1, obj, 0, 0, NULL, |
| 1263 | &dev->watch_request, NULL); |
| 1264 | |
| 1265 | if (ret < 0) |
| 1266 | goto fail_event; |
| 1267 | |
| 1268 | rbd_destroy_ops(ops); |
| 1269 | return 0; |
| 1270 | |
| 1271 | fail_event: |
| 1272 | ceph_osdc_cancel_event(dev->watch_event); |
| 1273 | dev->watch_event = NULL; |
| 1274 | fail: |
| 1275 | rbd_destroy_ops(ops); |
| 1276 | return ret; |
| 1277 | } |
| 1278 | |
Yehuda Sadeh | 79e3057c | 2011-07-12 16:56:57 -0700 | [diff] [blame] | 1279 | /* |
| 1280 | * Request sync osd unwatch |
| 1281 | */ |
| 1282 | static int rbd_req_sync_unwatch(struct rbd_device *dev, |
| 1283 | const char *obj) |
| 1284 | { |
| 1285 | struct ceph_osd_req_op *ops; |
| 1286 | |
| 1287 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); |
| 1288 | if (ret < 0) |
| 1289 | return ret; |
| 1290 | |
| 1291 | ops[0].watch.ver = 0; |
| 1292 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); |
| 1293 | ops[0].watch.flag = 0; |
| 1294 | |
| 1295 | ret = rbd_req_sync_op(dev, NULL, |
| 1296 | CEPH_NOSNAP, |
| 1297 | 0, |
| 1298 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1299 | ops, |
| 1300 | 1, obj, 0, 0, NULL, NULL, NULL); |
| 1301 | |
| 1302 | rbd_destroy_ops(ops); |
| 1303 | ceph_osdc_cancel_event(dev->watch_event); |
| 1304 | dev->watch_event = NULL; |
| 1305 | return ret; |
| 1306 | } |
| 1307 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1308 | struct rbd_notify_info { |
| 1309 | struct rbd_device *dev; |
| 1310 | }; |
| 1311 | |
| 1312 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) |
| 1313 | { |
| 1314 | struct rbd_device *dev = (struct rbd_device *)data; |
| 1315 | if (!dev) |
| 1316 | return; |
| 1317 | |
| 1318 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, |
| 1319 | notify_id, (int)opcode); |
| 1320 | } |
| 1321 | |
| 1322 | /* |
| 1323 | * Request sync osd notify |
| 1324 | */ |
| 1325 | static int rbd_req_sync_notify(struct rbd_device *dev, |
| 1326 | const char *obj) |
| 1327 | { |
| 1328 | struct ceph_osd_req_op *ops; |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 1329 | struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1330 | struct ceph_osd_event *event; |
| 1331 | struct rbd_notify_info info; |
| 1332 | int payload_len = sizeof(u32) + sizeof(u32); |
| 1333 | int ret; |
| 1334 | |
| 1335 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); |
| 1336 | if (ret < 0) |
| 1337 | return ret; |
| 1338 | |
| 1339 | info.dev = dev; |
| 1340 | |
| 1341 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, |
| 1342 | (void *)&info, &event); |
| 1343 | if (ret < 0) |
| 1344 | goto fail; |
| 1345 | |
| 1346 | ops[0].watch.ver = 1; |
| 1347 | ops[0].watch.flag = 1; |
| 1348 | ops[0].watch.cookie = event->cookie; |
| 1349 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; |
| 1350 | ops[0].watch.timeout = 12; |
| 1351 | |
| 1352 | ret = rbd_req_sync_op(dev, NULL, |
| 1353 | CEPH_NOSNAP, |
| 1354 | 0, |
| 1355 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1356 | ops, |
| 1357 | 1, obj, 0, 0, NULL, NULL, NULL); |
| 1358 | if (ret < 0) |
| 1359 | goto fail_event; |
| 1360 | |
| 1361 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); |
| 1362 | dout("ceph_osdc_wait_event returned %d\n", ret); |
| 1363 | rbd_destroy_ops(ops); |
| 1364 | return 0; |
| 1365 | |
| 1366 | fail_event: |
| 1367 | ceph_osdc_cancel_event(event); |
| 1368 | fail: |
| 1369 | rbd_destroy_ops(ops); |
| 1370 | return ret; |
| 1371 | } |
| 1372 | |
| 1373 | /* |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1374 | * Request sync osd read |
| 1375 | */ |
| 1376 | static int rbd_req_sync_exec(struct rbd_device *dev, |
| 1377 | const char *obj, |
| 1378 | const char *cls, |
| 1379 | const char *method, |
| 1380 | const char *data, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1381 | int len, |
| 1382 | u64 *ver) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1383 | { |
| 1384 | struct ceph_osd_req_op *ops; |
| 1385 | int cls_len = strlen(cls); |
| 1386 | int method_len = strlen(method); |
| 1387 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, |
| 1388 | cls_len + method_len + len); |
| 1389 | if (ret < 0) |
| 1390 | return ret; |
| 1391 | |
| 1392 | ops[0].cls.class_name = cls; |
| 1393 | ops[0].cls.class_len = (__u8)cls_len; |
| 1394 | ops[0].cls.method_name = method; |
| 1395 | ops[0].cls.method_len = (__u8)method_len; |
| 1396 | ops[0].cls.argc = 0; |
| 1397 | ops[0].cls.indata = data; |
| 1398 | ops[0].cls.indata_len = len; |
| 1399 | |
| 1400 | ret = rbd_req_sync_op(dev, NULL, |
| 1401 | CEPH_NOSNAP, |
| 1402 | 0, |
| 1403 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1404 | ops, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1405 | 1, obj, 0, 0, NULL, NULL, ver); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1406 | |
| 1407 | rbd_destroy_ops(ops); |
| 1408 | |
| 1409 | dout("cls_exec returned %d\n", ret); |
| 1410 | return ret; |
| 1411 | } |
| 1412 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1413 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
| 1414 | { |
| 1415 | struct rbd_req_coll *coll = |
| 1416 | kzalloc(sizeof(struct rbd_req_coll) + |
| 1417 | sizeof(struct rbd_req_status) * num_reqs, |
| 1418 | GFP_ATOMIC); |
| 1419 | |
| 1420 | if (!coll) |
| 1421 | return NULL; |
| 1422 | coll->total = num_reqs; |
| 1423 | kref_init(&coll->kref); |
| 1424 | return coll; |
| 1425 | } |
| 1426 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1427 | /* |
| 1428 | * block device queue callback |
| 1429 | */ |
| 1430 | static void rbd_rq_fn(struct request_queue *q) |
| 1431 | { |
| 1432 | struct rbd_device *rbd_dev = q->queuedata; |
| 1433 | struct request *rq; |
| 1434 | struct bio_pair *bp = NULL; |
| 1435 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1436 | while ((rq = blk_fetch_request(q))) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1437 | struct bio *bio; |
| 1438 | struct bio *rq_bio, *next_bio = NULL; |
| 1439 | bool do_write; |
| 1440 | int size, op_size = 0; |
| 1441 | u64 ofs; |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1442 | int num_segs, cur_seg = 0; |
| 1443 | struct rbd_req_coll *coll; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1444 | |
| 1445 | /* peek at request from block layer */ |
| 1446 | if (!rq) |
| 1447 | break; |
| 1448 | |
| 1449 | dout("fetched request\n"); |
| 1450 | |
| 1451 | /* filter out block requests we don't understand */ |
| 1452 | if ((rq->cmd_type != REQ_TYPE_FS)) { |
| 1453 | __blk_end_request_all(rq, 0); |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1454 | continue; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1455 | } |
| 1456 | |
| 1457 | /* deduce our operation (read, write) */ |
| 1458 | do_write = (rq_data_dir(rq) == WRITE); |
| 1459 | |
| 1460 | size = blk_rq_bytes(rq); |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1461 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1462 | rq_bio = rq->bio; |
| 1463 | if (do_write && rbd_dev->read_only) { |
| 1464 | __blk_end_request_all(rq, -EROFS); |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1465 | continue; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | spin_unlock_irq(q->queue_lock); |
| 1469 | |
| 1470 | dout("%s 0x%x bytes at 0x%llx\n", |
| 1471 | do_write ? "write" : "read", |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1472 | size, blk_rq_pos(rq) * SECTOR_SIZE); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1473 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1474 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
| 1475 | coll = rbd_alloc_coll(num_segs); |
| 1476 | if (!coll) { |
| 1477 | spin_lock_irq(q->queue_lock); |
| 1478 | __blk_end_request_all(rq, -ENOMEM); |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1479 | continue; |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1480 | } |
| 1481 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1482 | do { |
| 1483 | /* a bio clone to be passed down to OSD req */ |
| 1484 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); |
| 1485 | op_size = rbd_get_segment(&rbd_dev->header, |
| 1486 | rbd_dev->header.block_name, |
| 1487 | ofs, size, |
| 1488 | NULL, NULL); |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1489 | kref_get(&coll->kref); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1490 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
| 1491 | op_size, GFP_ATOMIC); |
| 1492 | if (!bio) { |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1493 | rbd_coll_end_req_index(rq, coll, cur_seg, |
| 1494 | -ENOMEM, op_size); |
| 1495 | goto next_seg; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1496 | } |
| 1497 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1498 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1499 | /* init OSD command: write or read */ |
| 1500 | if (do_write) |
| 1501 | rbd_req_write(rq, rbd_dev, |
| 1502 | rbd_dev->header.snapc, |
| 1503 | ofs, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1504 | op_size, bio, |
| 1505 | coll, cur_seg); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1506 | else |
| 1507 | rbd_req_read(rq, rbd_dev, |
Josh Durgin | 77dfe99 | 2011-11-21 13:04:42 -0800 | [diff] [blame] | 1508 | rbd_dev->snap_id, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1509 | ofs, |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1510 | op_size, bio, |
| 1511 | coll, cur_seg); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1512 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1513 | next_seg: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1514 | size -= op_size; |
| 1515 | ofs += op_size; |
| 1516 | |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1517 | cur_seg++; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1518 | rq_bio = next_bio; |
| 1519 | } while (size > 0); |
Yehuda Sadeh | 1fec709 | 2011-05-13 13:52:56 -0700 | [diff] [blame] | 1520 | kref_put(&coll->kref, rbd_coll_release); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1521 | |
| 1522 | if (bp) |
| 1523 | bio_pair_release(bp); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1524 | spin_lock_irq(q->queue_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | /* |
| 1529 | * a queue callback. Makes sure that we don't create a bio that spans across |
| 1530 | * multiple osd objects. One exception would be with a single page bios, |
| 1531 | * which we handle later at bio_chain_clone |
| 1532 | */ |
| 1533 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
| 1534 | struct bio_vec *bvec) |
| 1535 | { |
| 1536 | struct rbd_device *rbd_dev = q->queuedata; |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1537 | unsigned int chunk_sectors; |
| 1538 | sector_t sector; |
| 1539 | unsigned int bio_sectors; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1540 | int max; |
| 1541 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1542 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
| 1543 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); |
| 1544 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; |
| 1545 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1546 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1547 | + bio_sectors)) << SECTOR_SHIFT; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1548 | if (max < 0) |
| 1549 | max = 0; /* bio_add cannot handle a negative return */ |
| 1550 | if (max <= bvec->bv_len && bio_sectors == 0) |
| 1551 | return bvec->bv_len; |
| 1552 | return max; |
| 1553 | } |
| 1554 | |
| 1555 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
| 1556 | { |
| 1557 | struct gendisk *disk = rbd_dev->disk; |
| 1558 | |
| 1559 | if (!disk) |
| 1560 | return; |
| 1561 | |
| 1562 | rbd_header_free(&rbd_dev->header); |
| 1563 | |
| 1564 | if (disk->flags & GENHD_FL_UP) |
| 1565 | del_gendisk(disk); |
| 1566 | if (disk->queue) |
| 1567 | blk_cleanup_queue(disk->queue); |
| 1568 | put_disk(disk); |
| 1569 | } |
| 1570 | |
| 1571 | /* |
| 1572 | * reload the ondisk the header |
| 1573 | */ |
| 1574 | static int rbd_read_header(struct rbd_device *rbd_dev, |
| 1575 | struct rbd_image_header *header) |
| 1576 | { |
| 1577 | ssize_t rc; |
| 1578 | struct rbd_image_header_ondisk *dh; |
Xi Wang | 50f7c4c | 2012-04-20 15:49:44 -0500 | [diff] [blame] | 1579 | u32 snap_count = 0; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1580 | u64 ver; |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1581 | size_t len; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1582 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1583 | /* |
| 1584 | * First reads the fixed-size header to determine the number |
| 1585 | * of snapshots, then re-reads it, along with all snapshot |
| 1586 | * records as well as their stored names. |
| 1587 | */ |
| 1588 | len = sizeof (*dh); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1589 | while (1) { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1590 | dh = kmalloc(len, GFP_KERNEL); |
| 1591 | if (!dh) |
| 1592 | return -ENOMEM; |
| 1593 | |
| 1594 | rc = rbd_req_sync_read(rbd_dev, |
| 1595 | NULL, CEPH_NOSNAP, |
| 1596 | rbd_dev->obj_md_name, |
| 1597 | 0, len, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1598 | (char *)dh, &ver); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1599 | if (rc < 0) |
| 1600 | goto out_dh; |
| 1601 | |
| 1602 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); |
Josh Durgin | 81e759f | 2011-11-15 14:49:53 -0800 | [diff] [blame] | 1603 | if (rc < 0) { |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1604 | if (rc == -ENXIO) |
Josh Durgin | 81e759f | 2011-11-15 14:49:53 -0800 | [diff] [blame] | 1605 | pr_warning("unrecognized header format" |
| 1606 | " for image %s", rbd_dev->obj); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1607 | goto out_dh; |
Josh Durgin | 81e759f | 2011-11-15 14:49:53 -0800 | [diff] [blame] | 1608 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1609 | |
Alex Elder | 00f1f36 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 1610 | if (snap_count == header->total_snaps) |
| 1611 | break; |
| 1612 | |
| 1613 | snap_count = header->total_snaps; |
| 1614 | len = sizeof (*dh) + |
| 1615 | snap_count * sizeof(struct rbd_image_snap_ondisk) + |
| 1616 | header->snap_names_len; |
| 1617 | |
| 1618 | rbd_header_free(header); |
| 1619 | kfree(dh); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1620 | } |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1621 | header->obj_version = ver; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1622 | |
| 1623 | out_dh: |
| 1624 | kfree(dh); |
| 1625 | return rc; |
| 1626 | } |
| 1627 | |
| 1628 | /* |
| 1629 | * create a snapshot |
| 1630 | */ |
| 1631 | static int rbd_header_add_snap(struct rbd_device *dev, |
| 1632 | const char *snap_name, |
| 1633 | gfp_t gfp_flags) |
| 1634 | { |
| 1635 | int name_len = strlen(snap_name); |
| 1636 | u64 new_snapid; |
| 1637 | int ret; |
Sage Weil | 916d4d6 | 2011-05-12 16:10:50 -0700 | [diff] [blame] | 1638 | void *data, *p, *e; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1639 | u64 ver; |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 1640 | struct ceph_mon_client *monc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1641 | |
| 1642 | /* we should create a snapshot only if we're pointing at the head */ |
Josh Durgin | 77dfe99 | 2011-11-21 13:04:42 -0800 | [diff] [blame] | 1643 | if (dev->snap_id != CEPH_NOSNAP) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1644 | return -EINVAL; |
| 1645 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 1646 | monc = &dev->rbd_client->client->monc; |
| 1647 | ret = ceph_monc_create_snapid(monc, dev->poolid, &new_snapid); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1648 | dout("created snapid=%lld\n", new_snapid); |
| 1649 | if (ret < 0) |
| 1650 | return ret; |
| 1651 | |
| 1652 | data = kmalloc(name_len + 16, gfp_flags); |
| 1653 | if (!data) |
| 1654 | return -ENOMEM; |
| 1655 | |
Sage Weil | 916d4d6 | 2011-05-12 16:10:50 -0700 | [diff] [blame] | 1656 | p = data; |
| 1657 | e = data + name_len + 16; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1658 | |
Sage Weil | 916d4d6 | 2011-05-12 16:10:50 -0700 | [diff] [blame] | 1659 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
| 1660 | ceph_encode_64_safe(&p, e, new_snapid, bad); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1661 | |
| 1662 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", |
Sage Weil | 916d4d6 | 2011-05-12 16:10:50 -0700 | [diff] [blame] | 1663 | data, p - data, &ver); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1664 | |
Sage Weil | 916d4d6 | 2011-05-12 16:10:50 -0700 | [diff] [blame] | 1665 | kfree(data); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1666 | |
| 1667 | if (ret < 0) |
| 1668 | return ret; |
| 1669 | |
Josh Durgin | 403f24d | 2011-12-05 10:47:13 -0800 | [diff] [blame] | 1670 | down_write(&dev->header_rwsem); |
| 1671 | dev->header.snapc->seq = new_snapid; |
| 1672 | up_write(&dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1673 | |
| 1674 | return 0; |
| 1675 | bad: |
| 1676 | return -ERANGE; |
| 1677 | } |
| 1678 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1679 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
| 1680 | { |
| 1681 | struct rbd_snap *snap; |
| 1682 | |
| 1683 | while (!list_empty(&rbd_dev->snaps)) { |
| 1684 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); |
| 1685 | __rbd_remove_snap_dev(rbd_dev, snap); |
| 1686 | } |
| 1687 | } |
| 1688 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1689 | /* |
| 1690 | * only read the first part of the ondisk header, without the snaps info |
| 1691 | */ |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1692 | static int __rbd_update_snaps(struct rbd_device *rbd_dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1693 | { |
| 1694 | int ret; |
| 1695 | struct rbd_image_header h; |
| 1696 | u64 snap_seq; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1697 | int follow_seq = 0; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1698 | |
| 1699 | ret = rbd_read_header(rbd_dev, &h); |
| 1700 | if (ret < 0) |
| 1701 | return ret; |
| 1702 | |
Sage Weil | 9db4b3e | 2011-04-19 22:49:06 -0700 | [diff] [blame] | 1703 | /* resized? */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1704 | set_capacity(rbd_dev->disk, h.image_size / SECTOR_SIZE); |
Sage Weil | 9db4b3e | 2011-04-19 22:49:06 -0700 | [diff] [blame] | 1705 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 1706 | down_write(&rbd_dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1707 | |
| 1708 | snap_seq = rbd_dev->header.snapc->seq; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1709 | if (rbd_dev->header.total_snaps && |
| 1710 | rbd_dev->header.snapc->snaps[0] == snap_seq) |
| 1711 | /* pointing at the head, will need to follow that |
| 1712 | if head moves */ |
| 1713 | follow_seq = 1; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1714 | |
| 1715 | kfree(rbd_dev->header.snapc); |
| 1716 | kfree(rbd_dev->header.snap_names); |
| 1717 | kfree(rbd_dev->header.snap_sizes); |
| 1718 | |
| 1719 | rbd_dev->header.total_snaps = h.total_snaps; |
| 1720 | rbd_dev->header.snapc = h.snapc; |
| 1721 | rbd_dev->header.snap_names = h.snap_names; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1722 | rbd_dev->header.snap_names_len = h.snap_names_len; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1723 | rbd_dev->header.snap_sizes = h.snap_sizes; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 1724 | if (follow_seq) |
| 1725 | rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; |
| 1726 | else |
| 1727 | rbd_dev->header.snapc->seq = snap_seq; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1728 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1729 | ret = __rbd_init_snaps_header(rbd_dev); |
| 1730 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 1731 | up_write(&rbd_dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1732 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1733 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1734 | } |
| 1735 | |
| 1736 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
| 1737 | { |
| 1738 | struct gendisk *disk; |
| 1739 | struct request_queue *q; |
| 1740 | int rc; |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1741 | u64 segment_size; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1742 | u64 total_size = 0; |
| 1743 | |
| 1744 | /* contact OSD, request size info about the object being mapped */ |
| 1745 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); |
| 1746 | if (rc) |
| 1747 | return rc; |
| 1748 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1749 | /* no need to lock here, as rbd_dev is not registered yet */ |
| 1750 | rc = __rbd_init_snaps_header(rbd_dev); |
| 1751 | if (rc) |
| 1752 | return rc; |
| 1753 | |
Josh Durgin | cc9d734 | 2011-11-21 18:19:13 -0800 | [diff] [blame] | 1754 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1755 | if (rc) |
| 1756 | return rc; |
| 1757 | |
| 1758 | /* create gendisk info */ |
| 1759 | rc = -ENOMEM; |
| 1760 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
| 1761 | if (!disk) |
| 1762 | goto out; |
| 1763 | |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 1764 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
Sage Weil | aedfec5 | 2011-05-12 20:57:03 -0700 | [diff] [blame] | 1765 | rbd_dev->id); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1766 | disk->major = rbd_dev->major; |
| 1767 | disk->first_minor = 0; |
| 1768 | disk->fops = &rbd_bd_ops; |
| 1769 | disk->private_data = rbd_dev; |
| 1770 | |
| 1771 | /* init rq */ |
| 1772 | rc = -ENOMEM; |
| 1773 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
| 1774 | if (!q) |
| 1775 | goto out_disk; |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 1776 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1777 | /* We use the default size, but let's be explicit about it. */ |
| 1778 | blk_queue_physical_block_size(q, SECTOR_SIZE); |
| 1779 | |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 1780 | /* set io sizes to object size */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1781 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
| 1782 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); |
| 1783 | blk_queue_max_segment_size(q, segment_size); |
| 1784 | blk_queue_io_min(q, segment_size); |
| 1785 | blk_queue_io_opt(q, segment_size); |
Josh Durgin | 029bcbd | 2011-07-22 11:35:23 -0700 | [diff] [blame] | 1786 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1787 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
| 1788 | disk->queue = q; |
| 1789 | |
| 1790 | q->queuedata = rbd_dev; |
| 1791 | |
| 1792 | rbd_dev->disk = disk; |
| 1793 | rbd_dev->q = q; |
| 1794 | |
| 1795 | /* finally, announce the disk to the world */ |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1796 | set_capacity(disk, total_size / SECTOR_SIZE); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1797 | add_disk(disk); |
| 1798 | |
| 1799 | pr_info("%s: added with size 0x%llx\n", |
| 1800 | disk->disk_name, (unsigned long long)total_size); |
| 1801 | return 0; |
| 1802 | |
| 1803 | out_disk: |
| 1804 | put_disk(disk); |
| 1805 | out: |
| 1806 | return rc; |
| 1807 | } |
| 1808 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1809 | /* |
| 1810 | sysfs |
| 1811 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1812 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1813 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
| 1814 | { |
| 1815 | return container_of(dev, struct rbd_device, dev); |
| 1816 | } |
| 1817 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1818 | static ssize_t rbd_size_show(struct device *dev, |
| 1819 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1820 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1821 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1822 | |
| 1823 | return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1824 | } |
| 1825 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1826 | static ssize_t rbd_major_show(struct device *dev, |
| 1827 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1828 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1829 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1830 | |
| 1831 | return sprintf(buf, "%d\n", rbd_dev->major); |
| 1832 | } |
| 1833 | |
| 1834 | static ssize_t rbd_client_id_show(struct device *dev, |
| 1835 | struct device_attribute *attr, char *buf) |
| 1836 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1837 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1838 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 1839 | return sprintf(buf, "client%lld\n", |
| 1840 | ceph_client_id(rbd_dev->rbd_client->client)); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1841 | } |
| 1842 | |
| 1843 | static ssize_t rbd_pool_show(struct device *dev, |
| 1844 | struct device_attribute *attr, char *buf) |
| 1845 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1846 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1847 | |
| 1848 | return sprintf(buf, "%s\n", rbd_dev->pool_name); |
| 1849 | } |
| 1850 | |
| 1851 | static ssize_t rbd_name_show(struct device *dev, |
| 1852 | struct device_attribute *attr, char *buf) |
| 1853 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1854 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1855 | |
| 1856 | return sprintf(buf, "%s\n", rbd_dev->obj); |
| 1857 | } |
| 1858 | |
| 1859 | static ssize_t rbd_snap_show(struct device *dev, |
| 1860 | struct device_attribute *attr, |
| 1861 | char *buf) |
| 1862 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1863 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1864 | |
| 1865 | return sprintf(buf, "%s\n", rbd_dev->snap_name); |
| 1866 | } |
| 1867 | |
| 1868 | static ssize_t rbd_image_refresh(struct device *dev, |
| 1869 | struct device_attribute *attr, |
| 1870 | const char *buf, |
| 1871 | size_t size) |
| 1872 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1873 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1874 | int rc; |
| 1875 | int ret = size; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1876 | |
| 1877 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1878 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1879 | rc = __rbd_update_snaps(rbd_dev); |
| 1880 | if (rc < 0) |
| 1881 | ret = rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1882 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1883 | mutex_unlock(&ctl_mutex); |
| 1884 | return ret; |
| 1885 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1886 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1887 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
| 1888 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
| 1889 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
| 1890 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
| 1891 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
| 1892 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
| 1893 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); |
| 1894 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1895 | |
| 1896 | static struct attribute *rbd_attrs[] = { |
| 1897 | &dev_attr_size.attr, |
| 1898 | &dev_attr_major.attr, |
| 1899 | &dev_attr_client_id.attr, |
| 1900 | &dev_attr_pool.attr, |
| 1901 | &dev_attr_name.attr, |
| 1902 | &dev_attr_current_snap.attr, |
| 1903 | &dev_attr_refresh.attr, |
| 1904 | &dev_attr_create_snap.attr, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1905 | NULL |
| 1906 | }; |
| 1907 | |
| 1908 | static struct attribute_group rbd_attr_group = { |
| 1909 | .attrs = rbd_attrs, |
| 1910 | }; |
| 1911 | |
| 1912 | static const struct attribute_group *rbd_attr_groups[] = { |
| 1913 | &rbd_attr_group, |
| 1914 | NULL |
| 1915 | }; |
| 1916 | |
| 1917 | static void rbd_sysfs_dev_release(struct device *dev) |
| 1918 | { |
| 1919 | } |
| 1920 | |
| 1921 | static struct device_type rbd_device_type = { |
| 1922 | .name = "rbd", |
| 1923 | .groups = rbd_attr_groups, |
| 1924 | .release = rbd_sysfs_dev_release, |
| 1925 | }; |
| 1926 | |
| 1927 | |
| 1928 | /* |
| 1929 | sysfs - snapshots |
| 1930 | */ |
| 1931 | |
| 1932 | static ssize_t rbd_snap_size_show(struct device *dev, |
| 1933 | struct device_attribute *attr, |
| 1934 | char *buf) |
| 1935 | { |
| 1936 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1937 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1938 | return sprintf(buf, "%zd\n", snap->size); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1939 | } |
| 1940 | |
| 1941 | static ssize_t rbd_snap_id_show(struct device *dev, |
| 1942 | struct device_attribute *attr, |
| 1943 | char *buf) |
| 1944 | { |
| 1945 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1946 | |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 1947 | return sprintf(buf, "%llu\n", (unsigned long long) snap->id); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1948 | } |
| 1949 | |
| 1950 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
| 1951 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
| 1952 | |
| 1953 | static struct attribute *rbd_snap_attrs[] = { |
| 1954 | &dev_attr_snap_size.attr, |
| 1955 | &dev_attr_snap_id.attr, |
| 1956 | NULL, |
| 1957 | }; |
| 1958 | |
| 1959 | static struct attribute_group rbd_snap_attr_group = { |
| 1960 | .attrs = rbd_snap_attrs, |
| 1961 | }; |
| 1962 | |
| 1963 | static void rbd_snap_dev_release(struct device *dev) |
| 1964 | { |
| 1965 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1966 | kfree(snap->name); |
| 1967 | kfree(snap); |
| 1968 | } |
| 1969 | |
| 1970 | static const struct attribute_group *rbd_snap_attr_groups[] = { |
| 1971 | &rbd_snap_attr_group, |
| 1972 | NULL |
| 1973 | }; |
| 1974 | |
| 1975 | static struct device_type rbd_snap_device_type = { |
| 1976 | .groups = rbd_snap_attr_groups, |
| 1977 | .release = rbd_snap_dev_release, |
| 1978 | }; |
| 1979 | |
| 1980 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, |
| 1981 | struct rbd_snap *snap) |
| 1982 | { |
| 1983 | list_del(&snap->node); |
| 1984 | device_unregister(&snap->dev); |
| 1985 | } |
| 1986 | |
| 1987 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, |
| 1988 | struct rbd_snap *snap, |
| 1989 | struct device *parent) |
| 1990 | { |
| 1991 | struct device *dev = &snap->dev; |
| 1992 | int ret; |
| 1993 | |
| 1994 | dev->type = &rbd_snap_device_type; |
| 1995 | dev->parent = parent; |
| 1996 | dev->release = rbd_snap_dev_release; |
| 1997 | dev_set_name(dev, "snap_%s", snap->name); |
| 1998 | ret = device_register(dev); |
| 1999 | |
| 2000 | return ret; |
| 2001 | } |
| 2002 | |
| 2003 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, |
| 2004 | int i, const char *name, |
| 2005 | struct rbd_snap **snapp) |
| 2006 | { |
| 2007 | int ret; |
| 2008 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); |
| 2009 | if (!snap) |
| 2010 | return -ENOMEM; |
| 2011 | snap->name = kstrdup(name, GFP_KERNEL); |
| 2012 | snap->size = rbd_dev->header.snap_sizes[i]; |
| 2013 | snap->id = rbd_dev->header.snapc->snaps[i]; |
| 2014 | if (device_is_registered(&rbd_dev->dev)) { |
| 2015 | ret = rbd_register_snap_dev(rbd_dev, snap, |
| 2016 | &rbd_dev->dev); |
| 2017 | if (ret < 0) |
| 2018 | goto err; |
| 2019 | } |
| 2020 | *snapp = snap; |
| 2021 | return 0; |
| 2022 | err: |
| 2023 | kfree(snap->name); |
| 2024 | kfree(snap); |
| 2025 | return ret; |
| 2026 | } |
| 2027 | |
| 2028 | /* |
| 2029 | * search for the previous snap in a null delimited string list |
| 2030 | */ |
| 2031 | const char *rbd_prev_snap_name(const char *name, const char *start) |
| 2032 | { |
| 2033 | if (name < start + 2) |
| 2034 | return NULL; |
| 2035 | |
| 2036 | name -= 2; |
| 2037 | while (*name) { |
| 2038 | if (name == start) |
| 2039 | return start; |
| 2040 | name--; |
| 2041 | } |
| 2042 | return name + 1; |
| 2043 | } |
| 2044 | |
| 2045 | /* |
| 2046 | * compare the old list of snapshots that we have to what's in the header |
| 2047 | * and update it accordingly. Note that the header holds the snapshots |
| 2048 | * in a reverse order (from newest to oldest) and we need to go from |
| 2049 | * older to new so that we don't get a duplicate snap name when |
| 2050 | * doing the process (e.g., removed snapshot and recreated a new |
| 2051 | * one with the same name. |
| 2052 | */ |
| 2053 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) |
| 2054 | { |
| 2055 | const char *name, *first_name; |
| 2056 | int i = rbd_dev->header.total_snaps; |
| 2057 | struct rbd_snap *snap, *old_snap = NULL; |
| 2058 | int ret; |
| 2059 | struct list_head *p, *n; |
| 2060 | |
| 2061 | first_name = rbd_dev->header.snap_names; |
| 2062 | name = first_name + rbd_dev->header.snap_names_len; |
| 2063 | |
| 2064 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { |
| 2065 | u64 cur_id; |
| 2066 | |
| 2067 | old_snap = list_entry(p, struct rbd_snap, node); |
| 2068 | |
| 2069 | if (i) |
| 2070 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; |
| 2071 | |
| 2072 | if (!i || old_snap->id < cur_id) { |
| 2073 | /* old_snap->id was skipped, thus was removed */ |
| 2074 | __rbd_remove_snap_dev(rbd_dev, old_snap); |
| 2075 | continue; |
| 2076 | } |
| 2077 | if (old_snap->id == cur_id) { |
| 2078 | /* we have this snapshot already */ |
| 2079 | i--; |
| 2080 | name = rbd_prev_snap_name(name, first_name); |
| 2081 | continue; |
| 2082 | } |
| 2083 | for (; i > 0; |
| 2084 | i--, name = rbd_prev_snap_name(name, first_name)) { |
| 2085 | if (!name) { |
| 2086 | WARN_ON(1); |
| 2087 | return -EINVAL; |
| 2088 | } |
| 2089 | cur_id = rbd_dev->header.snapc->snaps[i]; |
| 2090 | /* snapshot removal? handle it above */ |
| 2091 | if (cur_id >= old_snap->id) |
| 2092 | break; |
| 2093 | /* a new snapshot */ |
| 2094 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); |
| 2095 | if (ret < 0) |
| 2096 | return ret; |
| 2097 | |
| 2098 | /* note that we add it backward so using n and not p */ |
| 2099 | list_add(&snap->node, n); |
| 2100 | p = &snap->node; |
| 2101 | } |
| 2102 | } |
| 2103 | /* we're done going over the old snap list, just add what's left */ |
| 2104 | for (; i > 0; i--) { |
| 2105 | name = rbd_prev_snap_name(name, first_name); |
| 2106 | if (!name) { |
| 2107 | WARN_ON(1); |
| 2108 | return -EINVAL; |
| 2109 | } |
| 2110 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); |
| 2111 | if (ret < 0) |
| 2112 | return ret; |
| 2113 | list_add(&snap->node, &rbd_dev->snaps); |
| 2114 | } |
| 2115 | |
| 2116 | return 0; |
| 2117 | } |
| 2118 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2119 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
| 2120 | { |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2121 | int ret; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2122 | struct device *dev; |
| 2123 | struct rbd_snap *snap; |
| 2124 | |
| 2125 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 2126 | dev = &rbd_dev->dev; |
| 2127 | |
| 2128 | dev->bus = &rbd_bus_type; |
| 2129 | dev->type = &rbd_device_type; |
| 2130 | dev->parent = &rbd_root_dev; |
| 2131 | dev->release = rbd_dev_release; |
| 2132 | dev_set_name(dev, "%d", rbd_dev->id); |
| 2133 | ret = device_register(dev); |
| 2134 | if (ret < 0) |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2135 | goto out; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2136 | |
| 2137 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
| 2138 | ret = rbd_register_snap_dev(rbd_dev, snap, |
| 2139 | &rbd_dev->dev); |
| 2140 | if (ret < 0) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2141 | break; |
| 2142 | } |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2143 | out: |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2144 | mutex_unlock(&ctl_mutex); |
| 2145 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2146 | } |
| 2147 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2148 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
| 2149 | { |
| 2150 | device_unregister(&rbd_dev->dev); |
| 2151 | } |
| 2152 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2153 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
| 2154 | { |
| 2155 | int ret, rc; |
| 2156 | |
| 2157 | do { |
| 2158 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name, |
| 2159 | rbd_dev->header.obj_version); |
| 2160 | if (ret == -ERANGE) { |
| 2161 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 2162 | rc = __rbd_update_snaps(rbd_dev); |
| 2163 | mutex_unlock(&ctl_mutex); |
| 2164 | if (rc < 0) |
| 2165 | return rc; |
| 2166 | } |
| 2167 | } while (ret == -ERANGE); |
| 2168 | |
| 2169 | return ret; |
| 2170 | } |
| 2171 | |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2172 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
| 2173 | |
| 2174 | /* |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2175 | * Get a unique rbd identifier for the given new rbd_dev, and add |
| 2176 | * the rbd_dev to the global list. The minimum rbd id is 1. |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2177 | */ |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2178 | static void rbd_id_get(struct rbd_device *rbd_dev) |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 2179 | { |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2180 | rbd_dev->id = atomic64_inc_return(&rbd_id_max); |
| 2181 | |
| 2182 | spin_lock(&rbd_dev_list_lock); |
| 2183 | list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| 2184 | spin_unlock(&rbd_dev_list_lock); |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2185 | } |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 2186 | |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2187 | /* |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2188 | * Remove an rbd_dev from the global list, and record that its |
| 2189 | * identifier is no longer in use. |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2190 | */ |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2191 | static void rbd_id_put(struct rbd_device *rbd_dev) |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2192 | { |
Alex Elder | d184f6b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2193 | struct list_head *tmp; |
| 2194 | int rbd_id = rbd_dev->id; |
| 2195 | int max_id; |
| 2196 | |
| 2197 | BUG_ON(rbd_id < 1); |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2198 | |
| 2199 | spin_lock(&rbd_dev_list_lock); |
| 2200 | list_del_init(&rbd_dev->node); |
Alex Elder | d184f6b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2201 | |
| 2202 | /* |
| 2203 | * If the id being "put" is not the current maximum, there |
| 2204 | * is nothing special we need to do. |
| 2205 | */ |
| 2206 | if (rbd_id != atomic64_read(&rbd_id_max)) { |
| 2207 | spin_unlock(&rbd_dev_list_lock); |
| 2208 | return; |
| 2209 | } |
| 2210 | |
| 2211 | /* |
| 2212 | * We need to update the current maximum id. Search the |
| 2213 | * list to find out what it is. We're more likely to find |
| 2214 | * the maximum at the end, so search the list backward. |
| 2215 | */ |
| 2216 | max_id = 0; |
| 2217 | list_for_each_prev(tmp, &rbd_dev_list) { |
| 2218 | struct rbd_device *rbd_dev; |
| 2219 | |
| 2220 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
| 2221 | if (rbd_id > max_id) |
| 2222 | max_id = rbd_id; |
| 2223 | } |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2224 | spin_unlock(&rbd_dev_list_lock); |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 2225 | |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2226 | /* |
Alex Elder | d184f6b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2227 | * The max id could have been updated by rbd_id_get(), in |
| 2228 | * which case it now accurately reflects the new maximum. |
| 2229 | * Be careful not to overwrite the maximum value in that |
| 2230 | * case. |
Alex Elder | 1ddbe94 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2231 | */ |
Alex Elder | d184f6b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2232 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
Alex Elder | b7f23c3 | 2012-01-29 13:57:43 -0600 | [diff] [blame] | 2233 | } |
| 2234 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2235 | /* |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2236 | * Skips over white space at *buf, and updates *buf to point to the |
| 2237 | * first found non-space character (if any). Returns the length of |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 2238 | * the token (string of non-white space characters) found. Note |
| 2239 | * that *buf must be terminated with '\0'. |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2240 | */ |
| 2241 | static inline size_t next_token(const char **buf) |
| 2242 | { |
| 2243 | /* |
| 2244 | * These are the characters that produce nonzero for |
| 2245 | * isspace() in the "C" and "POSIX" locales. |
| 2246 | */ |
| 2247 | const char *spaces = " \f\n\r\t\v"; |
| 2248 | |
| 2249 | *buf += strspn(*buf, spaces); /* Find start of token */ |
| 2250 | |
| 2251 | return strcspn(*buf, spaces); /* Return token length */ |
| 2252 | } |
| 2253 | |
| 2254 | /* |
| 2255 | * Finds the next token in *buf, and if the provided token buffer is |
| 2256 | * big enough, copies the found token into it. The result, if |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 2257 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
| 2258 | * must be terminated with '\0' on entry. |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2259 | * |
| 2260 | * Returns the length of the token found (not including the '\0'). |
| 2261 | * Return value will be 0 if no token is found, and it will be >= |
| 2262 | * token_size if the token would not fit. |
| 2263 | * |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 2264 | * The *buf pointer will be updated to point beyond the end of the |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2265 | * found token. Note that this occurs even if the token buffer is |
| 2266 | * too small to hold it. |
| 2267 | */ |
| 2268 | static inline size_t copy_token(const char **buf, |
| 2269 | char *token, |
| 2270 | size_t token_size) |
| 2271 | { |
| 2272 | size_t len; |
| 2273 | |
| 2274 | len = next_token(buf); |
| 2275 | if (len < token_size) { |
| 2276 | memcpy(token, *buf, len); |
| 2277 | *(token + len) = '\0'; |
| 2278 | } |
| 2279 | *buf += len; |
| 2280 | |
| 2281 | return len; |
| 2282 | } |
| 2283 | |
| 2284 | /* |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2285 | * This fills in the pool_name, obj, obj_len, snap_name, obj_len, |
| 2286 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
| 2287 | * on the list of monitor addresses and other options provided via |
| 2288 | * /sys/bus/rbd/add. |
| 2289 | */ |
| 2290 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, |
| 2291 | const char *buf, |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2292 | const char **mon_addrs, |
Alex Elder | 5214ecc | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2293 | size_t *mon_addrs_size, |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2294 | char *options, |
| 2295 | size_t options_size) |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2296 | { |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2297 | size_t len; |
| 2298 | |
| 2299 | /* The first four tokens are required */ |
| 2300 | |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2301 | len = next_token(&buf); |
| 2302 | if (!len) |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2303 | return -EINVAL; |
Alex Elder | 5214ecc | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2304 | *mon_addrs_size = len + 1; |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2305 | *mon_addrs = buf; |
| 2306 | |
| 2307 | buf += len; |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2308 | |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2309 | len = copy_token(&buf, options, options_size); |
| 2310 | if (!len || len >= options_size) |
| 2311 | return -EINVAL; |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2312 | |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2313 | len = copy_token(&buf, rbd_dev->pool_name, sizeof (rbd_dev->pool_name)); |
| 2314 | if (!len || len >= sizeof (rbd_dev->pool_name)) |
| 2315 | return -EINVAL; |
| 2316 | |
| 2317 | len = copy_token(&buf, rbd_dev->obj, sizeof (rbd_dev->obj)); |
| 2318 | if (!len || len >= sizeof (rbd_dev->obj)) |
| 2319 | return -EINVAL; |
| 2320 | |
| 2321 | /* We have the object length in hand, save it. */ |
| 2322 | |
| 2323 | rbd_dev->obj_len = len; |
| 2324 | |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2325 | BUILD_BUG_ON(RBD_MAX_MD_NAME_LEN |
| 2326 | < RBD_MAX_OBJ_NAME_LEN + sizeof (RBD_SUFFIX)); |
| 2327 | sprintf(rbd_dev->obj_md_name, "%s%s", rbd_dev->obj, RBD_SUFFIX); |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2328 | |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2329 | /* |
| 2330 | * The snapshot name is optional, but it's an error if it's |
| 2331 | * too long. If no snapshot is supplied, fill in the default. |
| 2332 | */ |
| 2333 | len = copy_token(&buf, rbd_dev->snap_name, sizeof (rbd_dev->snap_name)); |
| 2334 | if (!len) |
| 2335 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
| 2336 | sizeof (RBD_SNAP_HEAD_NAME)); |
| 2337 | else if (len >= sizeof (rbd_dev->snap_name)) |
| 2338 | return -EINVAL; |
| 2339 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2340 | return 0; |
| 2341 | } |
| 2342 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2343 | static ssize_t rbd_add(struct bus_type *bus, |
| 2344 | const char *buf, |
| 2345 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2346 | { |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2347 | struct rbd_device *rbd_dev; |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2348 | const char *mon_addrs = NULL; |
| 2349 | size_t mon_addrs_size = 0; |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2350 | char *options = NULL; |
| 2351 | struct ceph_osd_client *osdc; |
| 2352 | int rc = -ENOMEM; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2353 | |
| 2354 | if (!try_module_get(THIS_MODULE)) |
| 2355 | return -ENODEV; |
| 2356 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2357 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
| 2358 | if (!rbd_dev) |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2359 | goto err_nomem; |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2360 | options = kmalloc(count, GFP_KERNEL); |
| 2361 | if (!options) |
| 2362 | goto err_nomem; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2363 | |
| 2364 | /* static rbd_device initialization */ |
| 2365 | spin_lock_init(&rbd_dev->lock); |
| 2366 | INIT_LIST_HEAD(&rbd_dev->node); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2367 | INIT_LIST_HEAD(&rbd_dev->snaps); |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 2368 | init_rwsem(&rbd_dev->header_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2369 | |
Josh Durgin | c666601 | 2011-11-21 17:11:12 -0800 | [diff] [blame] | 2370 | init_rwsem(&rbd_dev->header_rwsem); |
Alex Elder | 0e805a1 | 2012-01-11 19:42:15 -0800 | [diff] [blame] | 2371 | |
Alex Elder | d184f6b | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2372 | /* generate unique id: find highest unique id, add one */ |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2373 | rbd_id_get(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2374 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2375 | /* Fill in the device name, now that we have its id. */ |
Alex Elder | 81a8979 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2376 | BUILD_BUG_ON(DEV_NAME_LEN |
| 2377 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); |
| 2378 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->id); |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2379 | |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2380 | /* parse add command */ |
Alex Elder | 7ef3214 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2381 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
Alex Elder | e28fff26 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2382 | options, count); |
Alex Elder | a725f65e | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2383 | if (rc) |
| 2384 | goto err_put_id; |
| 2385 | |
Alex Elder | 5214ecc | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2386 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
| 2387 | options); |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2388 | if (IS_ERR(rbd_dev->rbd_client)) { |
| 2389 | rc = PTR_ERR(rbd_dev->rbd_client); |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2390 | goto err_put_id; |
Alex Elder | d720bcb | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2391 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2392 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2393 | /* pick the pool */ |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 2394 | osdc = &rbd_dev->rbd_client->client->osdc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2395 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
| 2396 | if (rc < 0) |
| 2397 | goto err_out_client; |
| 2398 | rbd_dev->poolid = rc; |
| 2399 | |
| 2400 | /* register our block device */ |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2401 | rc = register_blkdev(0, rbd_dev->name); |
| 2402 | if (rc < 0) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2403 | goto err_out_client; |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2404 | rbd_dev->major = rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2405 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2406 | rc = rbd_bus_add_dev(rbd_dev); |
| 2407 | if (rc) |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame] | 2408 | goto err_out_blkdev; |
| 2409 | |
Alex Elder | 32eec68 | 2012-02-08 16:11:14 -0600 | [diff] [blame] | 2410 | /* |
| 2411 | * At this point cleanup in the event of an error is the job |
| 2412 | * of the sysfs code (initiated by rbd_bus_del_dev()). |
| 2413 | * |
| 2414 | * Set up and announce blkdev mapping. |
| 2415 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2416 | rc = rbd_init_disk(rbd_dev); |
| 2417 | if (rc) |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame] | 2418 | goto err_out_bus; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2419 | |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2420 | rc = rbd_init_watch_dev(rbd_dev); |
| 2421 | if (rc) |
| 2422 | goto err_out_bus; |
| 2423 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2424 | return count; |
| 2425 | |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame] | 2426 | err_out_bus: |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame] | 2427 | /* this will also clean up rest of rbd_dev stuff */ |
| 2428 | |
| 2429 | rbd_bus_del_dev(rbd_dev); |
| 2430 | kfree(options); |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame] | 2431 | return rc; |
| 2432 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2433 | err_out_blkdev: |
| 2434 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| 2435 | err_out_client: |
| 2436 | rbd_put_client(rbd_dev); |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2437 | err_put_id: |
Alex Elder | 499afd5 | 2012-02-02 08:13:29 -0600 | [diff] [blame] | 2438 | rbd_id_put(rbd_dev); |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2439 | err_nomem: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2440 | kfree(options); |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2441 | kfree(rbd_dev); |
| 2442 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2443 | dout("Error adding device %s\n", buf); |
| 2444 | module_put(THIS_MODULE); |
Alex Elder | 27cc259 | 2012-02-02 08:13:30 -0600 | [diff] [blame] | 2445 | |
| 2446 | return (ssize_t) rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2447 | } |
| 2448 | |
| 2449 | static struct rbd_device *__rbd_get_dev(unsigned long id) |
| 2450 | { |
| 2451 | struct list_head *tmp; |
| 2452 | struct rbd_device *rbd_dev; |
| 2453 | |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2454 | spin_lock(&rbd_dev_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2455 | list_for_each(tmp, &rbd_dev_list) { |
| 2456 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2457 | if (rbd_dev->id == id) { |
| 2458 | spin_unlock(&rbd_dev_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2459 | return rbd_dev; |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2460 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2461 | } |
Alex Elder | e124a82 | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2462 | spin_unlock(&rbd_dev_list_lock); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2463 | return NULL; |
| 2464 | } |
| 2465 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2466 | static void rbd_dev_release(struct device *dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2467 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 2468 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2469 | |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 2470 | if (rbd_dev->watch_request) { |
| 2471 | struct ceph_client *client = rbd_dev->rbd_client->client; |
| 2472 | |
| 2473 | ceph_osdc_unregister_linger_request(&client->osdc, |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2474 | rbd_dev->watch_request); |
Alex Elder | 1dbb439 | 2012-01-24 10:08:37 -0600 | [diff] [blame] | 2475 | } |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2476 | if (rbd_dev->watch_event) |
Yehuda Sadeh | 79e3057c | 2011-07-12 16:56:57 -0700 | [diff] [blame] | 2477 | rbd_req_sync_unwatch(rbd_dev, rbd_dev->obj_md_name); |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2478 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2479 | rbd_put_client(rbd_dev); |
| 2480 | |
| 2481 | /* clean up and free blkdev */ |
| 2482 | rbd_free_disk(rbd_dev); |
| 2483 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
Alex Elder | 32eec68 | 2012-02-08 16:11:14 -0600 | [diff] [blame] | 2484 | |
| 2485 | /* done with the id, and with the rbd_dev */ |
| 2486 | rbd_id_put(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2487 | kfree(rbd_dev); |
| 2488 | |
| 2489 | /* release module ref */ |
| 2490 | module_put(THIS_MODULE); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2491 | } |
| 2492 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2493 | static ssize_t rbd_remove(struct bus_type *bus, |
| 2494 | const char *buf, |
| 2495 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2496 | { |
| 2497 | struct rbd_device *rbd_dev = NULL; |
| 2498 | int target_id, rc; |
| 2499 | unsigned long ul; |
| 2500 | int ret = count; |
| 2501 | |
| 2502 | rc = strict_strtoul(buf, 10, &ul); |
| 2503 | if (rc) |
| 2504 | return rc; |
| 2505 | |
| 2506 | /* convert to int; abort if we lost anything in the conversion */ |
| 2507 | target_id = (int) ul; |
| 2508 | if (target_id != ul) |
| 2509 | return -EINVAL; |
| 2510 | |
| 2511 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 2512 | |
| 2513 | rbd_dev = __rbd_get_dev(target_id); |
| 2514 | if (!rbd_dev) { |
| 2515 | ret = -ENOENT; |
| 2516 | goto done; |
| 2517 | } |
| 2518 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2519 | __rbd_remove_all_snaps(rbd_dev); |
| 2520 | rbd_bus_del_dev(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2521 | |
| 2522 | done: |
| 2523 | mutex_unlock(&ctl_mutex); |
| 2524 | return ret; |
| 2525 | } |
| 2526 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2527 | static ssize_t rbd_snap_add(struct device *dev, |
| 2528 | struct device_attribute *attr, |
| 2529 | const char *buf, |
| 2530 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2531 | { |
Alex Elder | 593a9e7 | 2012-02-07 12:03:37 -0600 | [diff] [blame] | 2532 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2533 | int ret; |
| 2534 | char *name = kmalloc(count + 1, GFP_KERNEL); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2535 | if (!name) |
| 2536 | return -ENOMEM; |
| 2537 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2538 | snprintf(name, count, "%s", buf); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2539 | |
| 2540 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 2541 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2542 | ret = rbd_header_add_snap(rbd_dev, |
| 2543 | name, GFP_KERNEL); |
| 2544 | if (ret < 0) |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2545 | goto err_unlock; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2546 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2547 | ret = __rbd_update_snaps(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2548 | if (ret < 0) |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2549 | goto err_unlock; |
| 2550 | |
| 2551 | /* shouldn't hold ctl_mutex when notifying.. notify might |
| 2552 | trigger a watch callback that would need to get that mutex */ |
| 2553 | mutex_unlock(&ctl_mutex); |
| 2554 | |
| 2555 | /* make a best effort, don't error if failed */ |
| 2556 | rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2557 | |
| 2558 | ret = count; |
Yehuda Sadeh | 59c2be1 | 2011-03-21 15:10:11 -0700 | [diff] [blame] | 2559 | kfree(name); |
| 2560 | return ret; |
| 2561 | |
| 2562 | err_unlock: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2563 | mutex_unlock(&ctl_mutex); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2564 | kfree(name); |
| 2565 | return ret; |
| 2566 | } |
| 2567 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2568 | /* |
| 2569 | * create control files in sysfs |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2570 | * /sys/bus/rbd/... |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2571 | */ |
| 2572 | static int rbd_sysfs_init(void) |
| 2573 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2574 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2575 | |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 2576 | ret = device_register(&rbd_root_dev); |
Alex Elder | 2107978 | 2012-01-24 10:08:36 -0600 | [diff] [blame] | 2577 | if (ret < 0) |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2578 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2579 | |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 2580 | ret = bus_register(&rbd_bus_type); |
| 2581 | if (ret < 0) |
| 2582 | device_unregister(&rbd_root_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2583 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2584 | return ret; |
| 2585 | } |
| 2586 | |
| 2587 | static void rbd_sysfs_cleanup(void) |
| 2588 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2589 | bus_unregister(&rbd_bus_type); |
Alex Elder | fed4c14 | 2012-02-07 12:03:36 -0600 | [diff] [blame] | 2590 | device_unregister(&rbd_root_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2591 | } |
| 2592 | |
| 2593 | int __init rbd_init(void) |
| 2594 | { |
| 2595 | int rc; |
| 2596 | |
| 2597 | rc = rbd_sysfs_init(); |
| 2598 | if (rc) |
| 2599 | return rc; |
Alex Elder | f0f8cef | 2012-01-29 13:57:44 -0600 | [diff] [blame] | 2600 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2601 | return 0; |
| 2602 | } |
| 2603 | |
| 2604 | void __exit rbd_exit(void) |
| 2605 | { |
| 2606 | rbd_sysfs_cleanup(); |
| 2607 | } |
| 2608 | |
| 2609 | module_init(rbd_init); |
| 2610 | module_exit(rbd_exit); |
| 2611 | |
| 2612 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| 2613 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
| 2614 | MODULE_DESCRIPTION("rados block device"); |
| 2615 | |
| 2616 | /* following authorship retained from original osdblk.c */ |
| 2617 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| 2618 | |
| 2619 | MODULE_LICENSE("GPL"); |