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