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> |
| 34 | |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/device.h> |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/fs.h> |
| 39 | #include <linux/blkdev.h> |
| 40 | |
| 41 | #include "rbd_types.h" |
| 42 | |
| 43 | #define DRV_NAME "rbd" |
| 44 | #define DRV_NAME_LONG "rbd (rados block device)" |
| 45 | |
| 46 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ |
| 47 | |
| 48 | #define RBD_MAX_MD_NAME_LEN (96 + sizeof(RBD_SUFFIX)) |
| 49 | #define RBD_MAX_POOL_NAME_LEN 64 |
| 50 | #define RBD_MAX_SNAP_NAME_LEN 32 |
| 51 | #define RBD_MAX_OPT_LEN 1024 |
| 52 | |
| 53 | #define RBD_SNAP_HEAD_NAME "-" |
| 54 | |
| 55 | #define DEV_NAME_LEN 32 |
| 56 | |
| 57 | /* |
| 58 | * block device image metadata (in-memory version) |
| 59 | */ |
| 60 | struct rbd_image_header { |
| 61 | u64 image_size; |
| 62 | char block_name[32]; |
| 63 | __u8 obj_order; |
| 64 | __u8 crypt_type; |
| 65 | __u8 comp_type; |
| 66 | struct rw_semaphore snap_rwsem; |
| 67 | struct ceph_snap_context *snapc; |
| 68 | size_t snap_names_len; |
| 69 | u64 snap_seq; |
| 70 | u32 total_snaps; |
| 71 | |
| 72 | char *snap_names; |
| 73 | u64 *snap_sizes; |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * an instance of the client. multiple devices may share a client. |
| 78 | */ |
| 79 | struct rbd_client { |
| 80 | struct ceph_client *client; |
| 81 | struct kref kref; |
| 82 | struct list_head node; |
| 83 | }; |
| 84 | |
| 85 | /* |
| 86 | * a single io request |
| 87 | */ |
| 88 | struct rbd_request { |
| 89 | struct request *rq; /* blk layer request */ |
| 90 | struct bio *bio; /* cloned bio */ |
| 91 | struct page **pages; /* list of used pages */ |
| 92 | u64 len; |
| 93 | }; |
| 94 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 95 | struct rbd_snap { |
| 96 | struct device dev; |
| 97 | const char *name; |
| 98 | size_t size; |
| 99 | struct list_head node; |
| 100 | u64 id; |
| 101 | }; |
| 102 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 103 | /* |
| 104 | * a single device |
| 105 | */ |
| 106 | struct rbd_device { |
| 107 | int id; /* blkdev unique id */ |
| 108 | |
| 109 | int major; /* blkdev assigned major */ |
| 110 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
| 111 | struct request_queue *q; |
| 112 | |
| 113 | struct ceph_client *client; |
| 114 | struct rbd_client *rbd_client; |
| 115 | |
| 116 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
| 117 | |
| 118 | spinlock_t lock; /* queue lock */ |
| 119 | |
| 120 | struct rbd_image_header header; |
| 121 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ |
| 122 | int obj_len; |
| 123 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ |
| 124 | char pool_name[RBD_MAX_POOL_NAME_LEN]; |
| 125 | int poolid; |
| 126 | |
| 127 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; |
| 128 | u32 cur_snap; /* index+1 of current snapshot within snap context |
| 129 | 0 - for the head */ |
| 130 | int read_only; |
| 131 | |
| 132 | struct list_head node; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 133 | |
| 134 | /* list of snapshots */ |
| 135 | struct list_head snaps; |
| 136 | |
| 137 | /* sysfs related */ |
| 138 | struct device dev; |
| 139 | }; |
| 140 | |
| 141 | static struct bus_type rbd_bus_type = { |
| 142 | .name = "rbd", |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
| 145 | static spinlock_t node_lock; /* protects client get/put */ |
| 146 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 147 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
| 148 | static LIST_HEAD(rbd_dev_list); /* devices */ |
| 149 | static LIST_HEAD(rbd_client_list); /* clients */ |
| 150 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 151 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
| 152 | static void rbd_dev_release(struct device *dev); |
| 153 | static ssize_t rbd_snap_rollback(struct device *dev, |
| 154 | struct device_attribute *attr, |
| 155 | const char *buf, |
| 156 | size_t size); |
| 157 | static ssize_t rbd_snap_add(struct device *dev, |
| 158 | struct device_attribute *attr, |
| 159 | const char *buf, |
| 160 | size_t count); |
| 161 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, |
| 162 | struct rbd_snap *snap);; |
| 163 | |
| 164 | |
| 165 | static struct rbd_device *dev_to_rbd(struct device *dev) |
| 166 | { |
| 167 | return container_of(dev, struct rbd_device, dev); |
| 168 | } |
| 169 | |
| 170 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
| 171 | { |
| 172 | return get_device(&rbd_dev->dev); |
| 173 | } |
| 174 | |
| 175 | static void rbd_put_dev(struct rbd_device *rbd_dev) |
| 176 | { |
| 177 | put_device(&rbd_dev->dev); |
| 178 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 179 | |
| 180 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
| 181 | { |
| 182 | struct gendisk *disk = bdev->bd_disk; |
| 183 | struct rbd_device *rbd_dev = disk->private_data; |
| 184 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 185 | rbd_get_dev(rbd_dev); |
| 186 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 187 | set_device_ro(bdev, rbd_dev->read_only); |
| 188 | |
| 189 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
| 190 | return -EROFS; |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 195 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
| 196 | { |
| 197 | struct rbd_device *rbd_dev = disk->private_data; |
| 198 | |
| 199 | rbd_put_dev(rbd_dev); |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 204 | static const struct block_device_operations rbd_bd_ops = { |
| 205 | .owner = THIS_MODULE, |
| 206 | .open = rbd_open, |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 207 | .release = rbd_release, |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 208 | }; |
| 209 | |
| 210 | /* |
| 211 | * Initialize an rbd client instance. |
| 212 | * We own *opt. |
| 213 | */ |
| 214 | static struct rbd_client *rbd_client_create(struct ceph_options *opt) |
| 215 | { |
| 216 | struct rbd_client *rbdc; |
| 217 | int ret = -ENOMEM; |
| 218 | |
| 219 | dout("rbd_client_create\n"); |
| 220 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| 221 | if (!rbdc) |
| 222 | goto out_opt; |
| 223 | |
| 224 | kref_init(&rbdc->kref); |
| 225 | INIT_LIST_HEAD(&rbdc->node); |
| 226 | |
| 227 | rbdc->client = ceph_create_client(opt, rbdc); |
| 228 | if (IS_ERR(rbdc->client)) |
| 229 | goto out_rbdc; |
Vasiliy Kulikov | 28f259b | 2010-09-26 12:59:37 +0400 | [diff] [blame] | 230 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 231 | |
| 232 | ret = ceph_open_session(rbdc->client); |
| 233 | if (ret < 0) |
| 234 | goto out_err; |
| 235 | |
| 236 | spin_lock(&node_lock); |
| 237 | list_add_tail(&rbdc->node, &rbd_client_list); |
| 238 | spin_unlock(&node_lock); |
| 239 | |
| 240 | dout("rbd_client_create created %p\n", rbdc); |
| 241 | return rbdc; |
| 242 | |
| 243 | out_err: |
| 244 | ceph_destroy_client(rbdc->client); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 245 | out_rbdc: |
| 246 | kfree(rbdc); |
| 247 | out_opt: |
Vasiliy Kulikov | 28f259b | 2010-09-26 12:59:37 +0400 | [diff] [blame] | 248 | if (opt) |
| 249 | ceph_destroy_options(opt); |
| 250 | return ERR_PTR(ret); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | /* |
| 254 | * Find a ceph client with specific addr and configuration. |
| 255 | */ |
| 256 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) |
| 257 | { |
| 258 | struct rbd_client *client_node; |
| 259 | |
| 260 | if (opt->flags & CEPH_OPT_NOSHARE) |
| 261 | return NULL; |
| 262 | |
| 263 | list_for_each_entry(client_node, &rbd_client_list, node) |
| 264 | if (ceph_compare_options(opt, client_node->client) == 0) |
| 265 | return client_node; |
| 266 | return NULL; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Get a ceph client with specific addr and configuration, if one does |
| 271 | * not exist create it. |
| 272 | */ |
| 273 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
| 274 | char *options) |
| 275 | { |
| 276 | struct rbd_client *rbdc; |
| 277 | struct ceph_options *opt; |
| 278 | int ret; |
| 279 | |
| 280 | ret = ceph_parse_options(&opt, options, mon_addr, |
| 281 | mon_addr + strlen(mon_addr), NULL, NULL); |
| 282 | if (ret < 0) |
| 283 | return ret; |
| 284 | |
| 285 | spin_lock(&node_lock); |
| 286 | rbdc = __rbd_client_find(opt); |
| 287 | if (rbdc) { |
| 288 | ceph_destroy_options(opt); |
| 289 | |
| 290 | /* using an existing client */ |
| 291 | kref_get(&rbdc->kref); |
| 292 | rbd_dev->rbd_client = rbdc; |
| 293 | rbd_dev->client = rbdc->client; |
| 294 | spin_unlock(&node_lock); |
| 295 | return 0; |
| 296 | } |
| 297 | spin_unlock(&node_lock); |
| 298 | |
| 299 | rbdc = rbd_client_create(opt); |
| 300 | if (IS_ERR(rbdc)) |
| 301 | return PTR_ERR(rbdc); |
| 302 | |
| 303 | rbd_dev->rbd_client = rbdc; |
| 304 | rbd_dev->client = rbdc->client; |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Destroy ceph client |
| 310 | */ |
| 311 | static void rbd_client_release(struct kref *kref) |
| 312 | { |
| 313 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
| 314 | |
| 315 | dout("rbd_release_client %p\n", rbdc); |
| 316 | spin_lock(&node_lock); |
| 317 | list_del(&rbdc->node); |
| 318 | spin_unlock(&node_lock); |
| 319 | |
| 320 | ceph_destroy_client(rbdc->client); |
| 321 | kfree(rbdc); |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Drop reference to ceph client node. If it's not referenced anymore, release |
| 326 | * it. |
| 327 | */ |
| 328 | static void rbd_put_client(struct rbd_device *rbd_dev) |
| 329 | { |
| 330 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); |
| 331 | rbd_dev->rbd_client = NULL; |
| 332 | rbd_dev->client = NULL; |
| 333 | } |
| 334 | |
| 335 | |
| 336 | /* |
| 337 | * Create a new header structure, translate header format from the on-disk |
| 338 | * header. |
| 339 | */ |
| 340 | static int rbd_header_from_disk(struct rbd_image_header *header, |
| 341 | struct rbd_image_header_ondisk *ondisk, |
| 342 | int allocated_snaps, |
| 343 | gfp_t gfp_flags) |
| 344 | { |
| 345 | int i; |
| 346 | u32 snap_count = le32_to_cpu(ondisk->snap_count); |
| 347 | int ret = -ENOMEM; |
| 348 | |
| 349 | init_rwsem(&header->snap_rwsem); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 350 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
| 351 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + |
| 352 | snap_count * |
| 353 | sizeof(struct rbd_image_snap_ondisk), |
| 354 | gfp_flags); |
| 355 | if (!header->snapc) |
| 356 | return -ENOMEM; |
| 357 | if (snap_count) { |
| 358 | header->snap_names = kmalloc(header->snap_names_len, |
| 359 | GFP_KERNEL); |
| 360 | if (!header->snap_names) |
| 361 | goto err_snapc; |
| 362 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), |
| 363 | GFP_KERNEL); |
| 364 | if (!header->snap_sizes) |
| 365 | goto err_names; |
| 366 | } else { |
| 367 | header->snap_names = NULL; |
| 368 | header->snap_sizes = NULL; |
| 369 | } |
| 370 | memcpy(header->block_name, ondisk->block_name, |
| 371 | sizeof(ondisk->block_name)); |
| 372 | |
| 373 | header->image_size = le64_to_cpu(ondisk->image_size); |
| 374 | header->obj_order = ondisk->options.order; |
| 375 | header->crypt_type = ondisk->options.crypt_type; |
| 376 | header->comp_type = ondisk->options.comp_type; |
| 377 | |
| 378 | atomic_set(&header->snapc->nref, 1); |
| 379 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); |
| 380 | header->snapc->num_snaps = snap_count; |
| 381 | header->total_snaps = snap_count; |
| 382 | |
| 383 | if (snap_count && |
| 384 | allocated_snaps == snap_count) { |
| 385 | for (i = 0; i < snap_count; i++) { |
| 386 | header->snapc->snaps[i] = |
| 387 | le64_to_cpu(ondisk->snaps[i].id); |
| 388 | header->snap_sizes[i] = |
| 389 | le64_to_cpu(ondisk->snaps[i].image_size); |
| 390 | } |
| 391 | |
| 392 | /* copy snapshot names */ |
| 393 | memcpy(header->snap_names, &ondisk->snaps[i], |
| 394 | header->snap_names_len); |
| 395 | } |
| 396 | |
| 397 | return 0; |
| 398 | |
| 399 | err_names: |
| 400 | kfree(header->snap_names); |
| 401 | err_snapc: |
| 402 | kfree(header->snapc); |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | static int snap_index(struct rbd_image_header *header, int snap_num) |
| 407 | { |
| 408 | return header->total_snaps - snap_num; |
| 409 | } |
| 410 | |
| 411 | static u64 cur_snap_id(struct rbd_device *rbd_dev) |
| 412 | { |
| 413 | struct rbd_image_header *header = &rbd_dev->header; |
| 414 | |
| 415 | if (!rbd_dev->cur_snap) |
| 416 | return 0; |
| 417 | |
| 418 | return header->snapc->snaps[snap_index(header, rbd_dev->cur_snap)]; |
| 419 | } |
| 420 | |
| 421 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
| 422 | u64 *seq, u64 *size) |
| 423 | { |
| 424 | int i; |
| 425 | char *p = header->snap_names; |
| 426 | |
| 427 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { |
| 428 | if (strcmp(snap_name, p) == 0) |
| 429 | break; |
| 430 | } |
| 431 | if (i == header->total_snaps) |
| 432 | return -ENOENT; |
| 433 | if (seq) |
| 434 | *seq = header->snapc->snaps[i]; |
| 435 | |
| 436 | if (size) |
| 437 | *size = header->snap_sizes[i]; |
| 438 | |
| 439 | return i; |
| 440 | } |
| 441 | |
| 442 | static int rbd_header_set_snap(struct rbd_device *dev, |
| 443 | const char *snap_name, |
| 444 | u64 *size) |
| 445 | { |
| 446 | struct rbd_image_header *header = &dev->header; |
| 447 | struct ceph_snap_context *snapc = header->snapc; |
| 448 | int ret = -ENOENT; |
| 449 | |
| 450 | down_write(&header->snap_rwsem); |
| 451 | |
| 452 | if (!snap_name || |
| 453 | !*snap_name || |
| 454 | strcmp(snap_name, "-") == 0 || |
| 455 | strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) { |
| 456 | if (header->total_snaps) |
| 457 | snapc->seq = header->snap_seq; |
| 458 | else |
| 459 | snapc->seq = 0; |
| 460 | dev->cur_snap = 0; |
| 461 | dev->read_only = 0; |
| 462 | if (size) |
| 463 | *size = header->image_size; |
| 464 | } else { |
| 465 | ret = snap_by_name(header, snap_name, &snapc->seq, size); |
| 466 | if (ret < 0) |
| 467 | goto done; |
| 468 | |
| 469 | dev->cur_snap = header->total_snaps - ret; |
| 470 | dev->read_only = 1; |
| 471 | } |
| 472 | |
| 473 | ret = 0; |
| 474 | done: |
| 475 | up_write(&header->snap_rwsem); |
| 476 | return ret; |
| 477 | } |
| 478 | |
| 479 | static void rbd_header_free(struct rbd_image_header *header) |
| 480 | { |
| 481 | kfree(header->snapc); |
| 482 | kfree(header->snap_names); |
| 483 | kfree(header->snap_sizes); |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * get the actual striped segment name, offset and length |
| 488 | */ |
| 489 | static u64 rbd_get_segment(struct rbd_image_header *header, |
| 490 | const char *block_name, |
| 491 | u64 ofs, u64 len, |
| 492 | char *seg_name, u64 *segofs) |
| 493 | { |
| 494 | u64 seg = ofs >> header->obj_order; |
| 495 | |
| 496 | if (seg_name) |
| 497 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, |
| 498 | "%s.%012llx", block_name, seg); |
| 499 | |
| 500 | ofs = ofs & ((1 << header->obj_order) - 1); |
| 501 | len = min_t(u64, len, (1 << header->obj_order) - ofs); |
| 502 | |
| 503 | if (segofs) |
| 504 | *segofs = ofs; |
| 505 | |
| 506 | return len; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * bio helpers |
| 511 | */ |
| 512 | |
| 513 | static void bio_chain_put(struct bio *chain) |
| 514 | { |
| 515 | struct bio *tmp; |
| 516 | |
| 517 | while (chain) { |
| 518 | tmp = chain; |
| 519 | chain = chain->bi_next; |
| 520 | bio_put(tmp); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * zeros a bio chain, starting at specific offset |
| 526 | */ |
| 527 | static void zero_bio_chain(struct bio *chain, int start_ofs) |
| 528 | { |
| 529 | struct bio_vec *bv; |
| 530 | unsigned long flags; |
| 531 | void *buf; |
| 532 | int i; |
| 533 | int pos = 0; |
| 534 | |
| 535 | while (chain) { |
| 536 | bio_for_each_segment(bv, chain, i) { |
| 537 | if (pos + bv->bv_len > start_ofs) { |
| 538 | int remainder = max(start_ofs - pos, 0); |
| 539 | buf = bvec_kmap_irq(bv, &flags); |
| 540 | memset(buf + remainder, 0, |
| 541 | bv->bv_len - remainder); |
Dan Carpenter | 85b5aaa | 2010-10-11 21:15:11 +0200 | [diff] [blame] | 542 | bvec_kunmap_irq(buf, &flags); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 543 | } |
| 544 | pos += bv->bv_len; |
| 545 | } |
| 546 | |
| 547 | chain = chain->bi_next; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * bio_chain_clone - clone a chain of bios up to a certain length. |
| 553 | * might return a bio_pair that will need to be released. |
| 554 | */ |
| 555 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, |
| 556 | struct bio_pair **bp, |
| 557 | int len, gfp_t gfpmask) |
| 558 | { |
| 559 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; |
| 560 | int total = 0; |
| 561 | |
| 562 | if (*bp) { |
| 563 | bio_pair_release(*bp); |
| 564 | *bp = NULL; |
| 565 | } |
| 566 | |
| 567 | while (old_chain && (total < len)) { |
| 568 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
| 569 | if (!tmp) |
| 570 | goto err_out; |
| 571 | |
| 572 | if (total + old_chain->bi_size > len) { |
| 573 | struct bio_pair *bp; |
| 574 | |
| 575 | /* |
| 576 | * this split can only happen with a single paged bio, |
| 577 | * split_bio will BUG_ON if this is not the case |
| 578 | */ |
| 579 | dout("bio_chain_clone split! total=%d remaining=%d" |
| 580 | "bi_size=%d\n", |
| 581 | (int)total, (int)len-total, |
| 582 | (int)old_chain->bi_size); |
| 583 | |
| 584 | /* split the bio. We'll release it either in the next |
| 585 | call, or it will have to be released outside */ |
| 586 | bp = bio_split(old_chain, (len - total) / 512ULL); |
| 587 | if (!bp) |
| 588 | goto err_out; |
| 589 | |
| 590 | __bio_clone(tmp, &bp->bio1); |
| 591 | |
| 592 | *next = &bp->bio2; |
| 593 | } else { |
| 594 | __bio_clone(tmp, old_chain); |
| 595 | *next = old_chain->bi_next; |
| 596 | } |
| 597 | |
| 598 | tmp->bi_bdev = NULL; |
| 599 | gfpmask &= ~__GFP_WAIT; |
| 600 | tmp->bi_next = NULL; |
| 601 | |
| 602 | if (!new_chain) { |
| 603 | new_chain = tail = tmp; |
| 604 | } else { |
| 605 | tail->bi_next = tmp; |
| 606 | tail = tmp; |
| 607 | } |
| 608 | old_chain = old_chain->bi_next; |
| 609 | |
| 610 | total += tmp->bi_size; |
| 611 | } |
| 612 | |
| 613 | BUG_ON(total < len); |
| 614 | |
| 615 | if (tail) |
| 616 | tail->bi_next = NULL; |
| 617 | |
| 618 | *old = old_chain; |
| 619 | |
| 620 | return new_chain; |
| 621 | |
| 622 | err_out: |
| 623 | dout("bio_chain_clone with err\n"); |
| 624 | bio_chain_put(new_chain); |
| 625 | return NULL; |
| 626 | } |
| 627 | |
| 628 | /* |
| 629 | * helpers for osd request op vectors. |
| 630 | */ |
| 631 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, |
| 632 | int num_ops, |
| 633 | int opcode, |
| 634 | u32 payload_len) |
| 635 | { |
| 636 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), |
| 637 | GFP_NOIO); |
| 638 | if (!*ops) |
| 639 | return -ENOMEM; |
| 640 | (*ops)[0].op = opcode; |
| 641 | /* |
| 642 | * op extent offset and length will be set later on |
| 643 | * in calc_raw_layout() |
| 644 | */ |
| 645 | (*ops)[0].payload_len = payload_len; |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) |
| 650 | { |
| 651 | kfree(ops); |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * Send ceph osd request |
| 656 | */ |
| 657 | static int rbd_do_request(struct request *rq, |
| 658 | struct rbd_device *dev, |
| 659 | struct ceph_snap_context *snapc, |
| 660 | u64 snapid, |
| 661 | const char *obj, u64 ofs, u64 len, |
| 662 | struct bio *bio, |
| 663 | struct page **pages, |
| 664 | int num_pages, |
| 665 | int flags, |
| 666 | struct ceph_osd_req_op *ops, |
| 667 | int num_reply, |
| 668 | void (*rbd_cb)(struct ceph_osd_request *req, |
| 669 | struct ceph_msg *msg)) |
| 670 | { |
| 671 | struct ceph_osd_request *req; |
| 672 | struct ceph_file_layout *layout; |
| 673 | int ret; |
| 674 | u64 bno; |
| 675 | struct timespec mtime = CURRENT_TIME; |
| 676 | struct rbd_request *req_data; |
| 677 | struct ceph_osd_request_head *reqhead; |
| 678 | struct rbd_image_header *header = &dev->header; |
| 679 | |
| 680 | ret = -ENOMEM; |
| 681 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
| 682 | if (!req_data) |
| 683 | goto done; |
| 684 | |
| 685 | dout("rbd_do_request len=%lld ofs=%lld\n", len, ofs); |
| 686 | |
| 687 | down_read(&header->snap_rwsem); |
| 688 | |
| 689 | req = ceph_osdc_alloc_request(&dev->client->osdc, flags, |
| 690 | snapc, |
| 691 | ops, |
| 692 | false, |
| 693 | GFP_NOIO, pages, bio); |
| 694 | if (IS_ERR(req)) { |
| 695 | up_read(&header->snap_rwsem); |
| 696 | ret = PTR_ERR(req); |
| 697 | goto done_pages; |
| 698 | } |
| 699 | |
| 700 | req->r_callback = rbd_cb; |
| 701 | |
| 702 | req_data->rq = rq; |
| 703 | req_data->bio = bio; |
| 704 | req_data->pages = pages; |
| 705 | req_data->len = len; |
| 706 | |
| 707 | req->r_priv = req_data; |
| 708 | |
| 709 | reqhead = req->r_request->front.iov_base; |
| 710 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); |
| 711 | |
| 712 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); |
| 713 | req->r_oid_len = strlen(req->r_oid); |
| 714 | |
| 715 | layout = &req->r_file_layout; |
| 716 | memset(layout, 0, sizeof(*layout)); |
| 717 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| 718 | layout->fl_stripe_count = cpu_to_le32(1); |
| 719 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| 720 | layout->fl_pg_preferred = cpu_to_le32(-1); |
| 721 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); |
| 722 | ceph_calc_raw_layout(&dev->client->osdc, layout, snapid, |
| 723 | ofs, &len, &bno, req, ops); |
| 724 | |
| 725 | ceph_osdc_build_request(req, ofs, &len, |
| 726 | ops, |
| 727 | snapc, |
| 728 | &mtime, |
| 729 | req->r_oid, req->r_oid_len); |
| 730 | up_read(&header->snap_rwsem); |
| 731 | |
| 732 | ret = ceph_osdc_start_request(&dev->client->osdc, req, false); |
| 733 | if (ret < 0) |
| 734 | goto done_err; |
| 735 | |
| 736 | if (!rbd_cb) { |
| 737 | ret = ceph_osdc_wait_request(&dev->client->osdc, req); |
| 738 | ceph_osdc_put_request(req); |
| 739 | } |
| 740 | return ret; |
| 741 | |
| 742 | done_err: |
| 743 | bio_chain_put(req_data->bio); |
| 744 | ceph_osdc_put_request(req); |
| 745 | done_pages: |
| 746 | kfree(req_data); |
| 747 | done: |
| 748 | if (rq) |
| 749 | blk_end_request(rq, ret, len); |
| 750 | return ret; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * Ceph osd op callback |
| 755 | */ |
| 756 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
| 757 | { |
| 758 | struct rbd_request *req_data = req->r_priv; |
| 759 | struct ceph_osd_reply_head *replyhead; |
| 760 | struct ceph_osd_op *op; |
| 761 | __s32 rc; |
| 762 | u64 bytes; |
| 763 | int read_op; |
| 764 | |
| 765 | /* parse reply */ |
| 766 | replyhead = msg->front.iov_base; |
| 767 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); |
| 768 | op = (void *)(replyhead + 1); |
| 769 | rc = le32_to_cpu(replyhead->result); |
| 770 | bytes = le64_to_cpu(op->extent.length); |
| 771 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); |
| 772 | |
| 773 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); |
| 774 | |
| 775 | if (rc == -ENOENT && read_op) { |
| 776 | zero_bio_chain(req_data->bio, 0); |
| 777 | rc = 0; |
| 778 | } else if (rc == 0 && read_op && bytes < req_data->len) { |
| 779 | zero_bio_chain(req_data->bio, bytes); |
| 780 | bytes = req_data->len; |
| 781 | } |
| 782 | |
| 783 | blk_end_request(req_data->rq, rc, bytes); |
| 784 | |
| 785 | if (req_data->bio) |
| 786 | bio_chain_put(req_data->bio); |
| 787 | |
| 788 | ceph_osdc_put_request(req); |
| 789 | kfree(req_data); |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Do a synchronous ceph osd operation |
| 794 | */ |
| 795 | static int rbd_req_sync_op(struct rbd_device *dev, |
| 796 | struct ceph_snap_context *snapc, |
| 797 | u64 snapid, |
| 798 | int opcode, |
| 799 | int flags, |
| 800 | struct ceph_osd_req_op *orig_ops, |
| 801 | int num_reply, |
| 802 | const char *obj, |
| 803 | u64 ofs, u64 len, |
| 804 | char *buf) |
| 805 | { |
| 806 | int ret; |
| 807 | struct page **pages; |
| 808 | int num_pages; |
| 809 | struct ceph_osd_req_op *ops = orig_ops; |
| 810 | u32 payload_len; |
| 811 | |
| 812 | num_pages = calc_pages_for(ofs , len); |
| 813 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
Dan Carpenter | b8d0638 | 2010-10-11 21:14:23 +0200 | [diff] [blame] | 814 | if (IS_ERR(pages)) |
| 815 | return PTR_ERR(pages); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 816 | |
| 817 | if (!orig_ops) { |
| 818 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); |
| 819 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); |
| 820 | if (ret < 0) |
| 821 | goto done; |
| 822 | |
| 823 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { |
| 824 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); |
| 825 | if (ret < 0) |
| 826 | goto done_ops; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | ret = rbd_do_request(NULL, dev, snapc, snapid, |
| 831 | obj, ofs, len, NULL, |
| 832 | pages, num_pages, |
| 833 | flags, |
| 834 | ops, |
| 835 | 2, |
| 836 | NULL); |
| 837 | if (ret < 0) |
| 838 | goto done_ops; |
| 839 | |
| 840 | if ((flags & CEPH_OSD_FLAG_READ) && buf) |
| 841 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); |
| 842 | |
| 843 | done_ops: |
| 844 | if (!orig_ops) |
| 845 | rbd_destroy_ops(ops); |
| 846 | done: |
| 847 | ceph_release_page_vector(pages, num_pages); |
| 848 | return ret; |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Do an asynchronous ceph osd operation |
| 853 | */ |
| 854 | static int rbd_do_op(struct request *rq, |
| 855 | struct rbd_device *rbd_dev , |
| 856 | struct ceph_snap_context *snapc, |
| 857 | u64 snapid, |
| 858 | int opcode, int flags, int num_reply, |
| 859 | u64 ofs, u64 len, |
| 860 | struct bio *bio) |
| 861 | { |
| 862 | char *seg_name; |
| 863 | u64 seg_ofs; |
| 864 | u64 seg_len; |
| 865 | int ret; |
| 866 | struct ceph_osd_req_op *ops; |
| 867 | u32 payload_len; |
| 868 | |
| 869 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
| 870 | if (!seg_name) |
| 871 | return -ENOMEM; |
| 872 | |
| 873 | seg_len = rbd_get_segment(&rbd_dev->header, |
| 874 | rbd_dev->header.block_name, |
| 875 | ofs, len, |
| 876 | seg_name, &seg_ofs); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 877 | |
| 878 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); |
| 879 | |
| 880 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); |
| 881 | if (ret < 0) |
| 882 | goto done; |
| 883 | |
| 884 | /* we've taken care of segment sizes earlier when we |
| 885 | cloned the bios. We should never have a segment |
| 886 | truncated at this point */ |
| 887 | BUG_ON(seg_len < len); |
| 888 | |
| 889 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, |
| 890 | seg_name, seg_ofs, seg_len, |
| 891 | bio, |
| 892 | NULL, 0, |
| 893 | flags, |
| 894 | ops, |
| 895 | num_reply, |
| 896 | rbd_req_cb); |
| 897 | done: |
| 898 | kfree(seg_name); |
| 899 | return ret; |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | * Request async osd write |
| 904 | */ |
| 905 | static int rbd_req_write(struct request *rq, |
| 906 | struct rbd_device *rbd_dev, |
| 907 | struct ceph_snap_context *snapc, |
| 908 | u64 ofs, u64 len, |
| 909 | struct bio *bio) |
| 910 | { |
| 911 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, |
| 912 | CEPH_OSD_OP_WRITE, |
| 913 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 914 | 2, |
| 915 | ofs, len, bio); |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * Request async osd read |
| 920 | */ |
| 921 | static int rbd_req_read(struct request *rq, |
| 922 | struct rbd_device *rbd_dev, |
| 923 | u64 snapid, |
| 924 | u64 ofs, u64 len, |
| 925 | struct bio *bio) |
| 926 | { |
| 927 | return rbd_do_op(rq, rbd_dev, NULL, |
| 928 | (snapid ? snapid : CEPH_NOSNAP), |
| 929 | CEPH_OSD_OP_READ, |
| 930 | CEPH_OSD_FLAG_READ, |
| 931 | 2, |
| 932 | ofs, len, bio); |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Request sync osd read |
| 937 | */ |
| 938 | static int rbd_req_sync_read(struct rbd_device *dev, |
| 939 | struct ceph_snap_context *snapc, |
| 940 | u64 snapid, |
| 941 | const char *obj, |
| 942 | u64 ofs, u64 len, |
| 943 | char *buf) |
| 944 | { |
| 945 | return rbd_req_sync_op(dev, NULL, |
| 946 | (snapid ? snapid : CEPH_NOSNAP), |
| 947 | CEPH_OSD_OP_READ, |
| 948 | CEPH_OSD_FLAG_READ, |
| 949 | NULL, |
| 950 | 1, obj, ofs, len, buf); |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * Request sync osd read |
| 955 | */ |
| 956 | static int rbd_req_sync_rollback_obj(struct rbd_device *dev, |
| 957 | u64 snapid, |
| 958 | const char *obj) |
| 959 | { |
| 960 | struct ceph_osd_req_op *ops; |
| 961 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_ROLLBACK, 0); |
| 962 | if (ret < 0) |
| 963 | return ret; |
| 964 | |
| 965 | ops[0].snap.snapid = snapid; |
| 966 | |
| 967 | ret = rbd_req_sync_op(dev, NULL, |
| 968 | CEPH_NOSNAP, |
| 969 | 0, |
| 970 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 971 | ops, |
| 972 | 1, obj, 0, 0, NULL); |
| 973 | |
| 974 | rbd_destroy_ops(ops); |
| 975 | |
| 976 | if (ret < 0) |
| 977 | return ret; |
| 978 | |
| 979 | return ret; |
| 980 | } |
| 981 | |
| 982 | /* |
| 983 | * Request sync osd read |
| 984 | */ |
| 985 | static int rbd_req_sync_exec(struct rbd_device *dev, |
| 986 | const char *obj, |
| 987 | const char *cls, |
| 988 | const char *method, |
| 989 | const char *data, |
| 990 | int len) |
| 991 | { |
| 992 | struct ceph_osd_req_op *ops; |
| 993 | int cls_len = strlen(cls); |
| 994 | int method_len = strlen(method); |
| 995 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, |
| 996 | cls_len + method_len + len); |
| 997 | if (ret < 0) |
| 998 | return ret; |
| 999 | |
| 1000 | ops[0].cls.class_name = cls; |
| 1001 | ops[0].cls.class_len = (__u8)cls_len; |
| 1002 | ops[0].cls.method_name = method; |
| 1003 | ops[0].cls.method_len = (__u8)method_len; |
| 1004 | ops[0].cls.argc = 0; |
| 1005 | ops[0].cls.indata = data; |
| 1006 | ops[0].cls.indata_len = len; |
| 1007 | |
| 1008 | ret = rbd_req_sync_op(dev, NULL, |
| 1009 | CEPH_NOSNAP, |
| 1010 | 0, |
| 1011 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
| 1012 | ops, |
| 1013 | 1, obj, 0, 0, NULL); |
| 1014 | |
| 1015 | rbd_destroy_ops(ops); |
| 1016 | |
| 1017 | dout("cls_exec returned %d\n", ret); |
| 1018 | return ret; |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * block device queue callback |
| 1023 | */ |
| 1024 | static void rbd_rq_fn(struct request_queue *q) |
| 1025 | { |
| 1026 | struct rbd_device *rbd_dev = q->queuedata; |
| 1027 | struct request *rq; |
| 1028 | struct bio_pair *bp = NULL; |
| 1029 | |
| 1030 | rq = blk_fetch_request(q); |
| 1031 | |
| 1032 | while (1) { |
| 1033 | struct bio *bio; |
| 1034 | struct bio *rq_bio, *next_bio = NULL; |
| 1035 | bool do_write; |
| 1036 | int size, op_size = 0; |
| 1037 | u64 ofs; |
| 1038 | |
| 1039 | /* peek at request from block layer */ |
| 1040 | if (!rq) |
| 1041 | break; |
| 1042 | |
| 1043 | dout("fetched request\n"); |
| 1044 | |
| 1045 | /* filter out block requests we don't understand */ |
| 1046 | if ((rq->cmd_type != REQ_TYPE_FS)) { |
| 1047 | __blk_end_request_all(rq, 0); |
| 1048 | goto next; |
| 1049 | } |
| 1050 | |
| 1051 | /* deduce our operation (read, write) */ |
| 1052 | do_write = (rq_data_dir(rq) == WRITE); |
| 1053 | |
| 1054 | size = blk_rq_bytes(rq); |
| 1055 | ofs = blk_rq_pos(rq) * 512ULL; |
| 1056 | rq_bio = rq->bio; |
| 1057 | if (do_write && rbd_dev->read_only) { |
| 1058 | __blk_end_request_all(rq, -EROFS); |
| 1059 | goto next; |
| 1060 | } |
| 1061 | |
| 1062 | spin_unlock_irq(q->queue_lock); |
| 1063 | |
| 1064 | dout("%s 0x%x bytes at 0x%llx\n", |
| 1065 | do_write ? "write" : "read", |
| 1066 | size, blk_rq_pos(rq) * 512ULL); |
| 1067 | |
| 1068 | do { |
| 1069 | /* a bio clone to be passed down to OSD req */ |
| 1070 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); |
| 1071 | op_size = rbd_get_segment(&rbd_dev->header, |
| 1072 | rbd_dev->header.block_name, |
| 1073 | ofs, size, |
| 1074 | NULL, NULL); |
| 1075 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
| 1076 | op_size, GFP_ATOMIC); |
| 1077 | if (!bio) { |
| 1078 | spin_lock_irq(q->queue_lock); |
| 1079 | __blk_end_request_all(rq, -ENOMEM); |
| 1080 | goto next; |
| 1081 | } |
| 1082 | |
| 1083 | /* init OSD command: write or read */ |
| 1084 | if (do_write) |
| 1085 | rbd_req_write(rq, rbd_dev, |
| 1086 | rbd_dev->header.snapc, |
| 1087 | ofs, |
| 1088 | op_size, bio); |
| 1089 | else |
| 1090 | rbd_req_read(rq, rbd_dev, |
| 1091 | cur_snap_id(rbd_dev), |
| 1092 | ofs, |
| 1093 | op_size, bio); |
| 1094 | |
| 1095 | size -= op_size; |
| 1096 | ofs += op_size; |
| 1097 | |
| 1098 | rq_bio = next_bio; |
| 1099 | } while (size > 0); |
| 1100 | |
| 1101 | if (bp) |
| 1102 | bio_pair_release(bp); |
| 1103 | |
| 1104 | spin_lock_irq(q->queue_lock); |
| 1105 | next: |
| 1106 | rq = blk_fetch_request(q); |
| 1107 | } |
| 1108 | } |
| 1109 | |
| 1110 | /* |
| 1111 | * a queue callback. Makes sure that we don't create a bio that spans across |
| 1112 | * multiple osd objects. One exception would be with a single page bios, |
| 1113 | * which we handle later at bio_chain_clone |
| 1114 | */ |
| 1115 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
| 1116 | struct bio_vec *bvec) |
| 1117 | { |
| 1118 | struct rbd_device *rbd_dev = q->queuedata; |
| 1119 | unsigned int chunk_sectors = 1 << (rbd_dev->header.obj_order - 9); |
| 1120 | sector_t sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); |
| 1121 | unsigned int bio_sectors = bmd->bi_size >> 9; |
| 1122 | int max; |
| 1123 | |
| 1124 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
| 1125 | + bio_sectors)) << 9; |
| 1126 | if (max < 0) |
| 1127 | max = 0; /* bio_add cannot handle a negative return */ |
| 1128 | if (max <= bvec->bv_len && bio_sectors == 0) |
| 1129 | return bvec->bv_len; |
| 1130 | return max; |
| 1131 | } |
| 1132 | |
| 1133 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
| 1134 | { |
| 1135 | struct gendisk *disk = rbd_dev->disk; |
| 1136 | |
| 1137 | if (!disk) |
| 1138 | return; |
| 1139 | |
| 1140 | rbd_header_free(&rbd_dev->header); |
| 1141 | |
| 1142 | if (disk->flags & GENHD_FL_UP) |
| 1143 | del_gendisk(disk); |
| 1144 | if (disk->queue) |
| 1145 | blk_cleanup_queue(disk->queue); |
| 1146 | put_disk(disk); |
| 1147 | } |
| 1148 | |
| 1149 | /* |
| 1150 | * reload the ondisk the header |
| 1151 | */ |
| 1152 | static int rbd_read_header(struct rbd_device *rbd_dev, |
| 1153 | struct rbd_image_header *header) |
| 1154 | { |
| 1155 | ssize_t rc; |
| 1156 | struct rbd_image_header_ondisk *dh; |
| 1157 | int snap_count = 0; |
| 1158 | u64 snap_names_len = 0; |
| 1159 | |
| 1160 | while (1) { |
| 1161 | int len = sizeof(*dh) + |
| 1162 | snap_count * sizeof(struct rbd_image_snap_ondisk) + |
| 1163 | snap_names_len; |
| 1164 | |
| 1165 | rc = -ENOMEM; |
| 1166 | dh = kmalloc(len, GFP_KERNEL); |
| 1167 | if (!dh) |
| 1168 | return -ENOMEM; |
| 1169 | |
| 1170 | rc = rbd_req_sync_read(rbd_dev, |
| 1171 | NULL, CEPH_NOSNAP, |
| 1172 | rbd_dev->obj_md_name, |
| 1173 | 0, len, |
| 1174 | (char *)dh); |
| 1175 | if (rc < 0) |
| 1176 | goto out_dh; |
| 1177 | |
| 1178 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); |
| 1179 | if (rc < 0) |
| 1180 | goto out_dh; |
| 1181 | |
| 1182 | if (snap_count != header->total_snaps) { |
| 1183 | snap_count = header->total_snaps; |
| 1184 | snap_names_len = header->snap_names_len; |
| 1185 | rbd_header_free(header); |
| 1186 | kfree(dh); |
| 1187 | continue; |
| 1188 | } |
| 1189 | break; |
| 1190 | } |
| 1191 | |
| 1192 | out_dh: |
| 1193 | kfree(dh); |
| 1194 | return rc; |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * create a snapshot |
| 1199 | */ |
| 1200 | static int rbd_header_add_snap(struct rbd_device *dev, |
| 1201 | const char *snap_name, |
| 1202 | gfp_t gfp_flags) |
| 1203 | { |
| 1204 | int name_len = strlen(snap_name); |
| 1205 | u64 new_snapid; |
| 1206 | int ret; |
| 1207 | void *data, *data_start, *data_end; |
| 1208 | |
| 1209 | /* we should create a snapshot only if we're pointing at the head */ |
| 1210 | if (dev->cur_snap) |
| 1211 | return -EINVAL; |
| 1212 | |
| 1213 | ret = ceph_monc_create_snapid(&dev->client->monc, dev->poolid, |
| 1214 | &new_snapid); |
| 1215 | dout("created snapid=%lld\n", new_snapid); |
| 1216 | if (ret < 0) |
| 1217 | return ret; |
| 1218 | |
| 1219 | data = kmalloc(name_len + 16, gfp_flags); |
| 1220 | if (!data) |
| 1221 | return -ENOMEM; |
| 1222 | |
| 1223 | data_start = data; |
| 1224 | data_end = data + name_len + 16; |
| 1225 | |
| 1226 | ceph_encode_string_safe(&data, data_end, snap_name, name_len, bad); |
| 1227 | ceph_encode_64_safe(&data, data_end, new_snapid, bad); |
| 1228 | |
| 1229 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", |
| 1230 | data_start, data - data_start); |
| 1231 | |
| 1232 | kfree(data_start); |
| 1233 | |
| 1234 | if (ret < 0) |
| 1235 | return ret; |
| 1236 | |
| 1237 | dev->header.snapc->seq = new_snapid; |
| 1238 | |
| 1239 | return 0; |
| 1240 | bad: |
| 1241 | return -ERANGE; |
| 1242 | } |
| 1243 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1244 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
| 1245 | { |
| 1246 | struct rbd_snap *snap; |
| 1247 | |
| 1248 | while (!list_empty(&rbd_dev->snaps)) { |
| 1249 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); |
| 1250 | __rbd_remove_snap_dev(rbd_dev, snap); |
| 1251 | } |
| 1252 | } |
| 1253 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1254 | /* |
| 1255 | * only read the first part of the ondisk header, without the snaps info |
| 1256 | */ |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1257 | static int __rbd_update_snaps(struct rbd_device *rbd_dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1258 | { |
| 1259 | int ret; |
| 1260 | struct rbd_image_header h; |
| 1261 | u64 snap_seq; |
| 1262 | |
| 1263 | ret = rbd_read_header(rbd_dev, &h); |
| 1264 | if (ret < 0) |
| 1265 | return ret; |
| 1266 | |
| 1267 | down_write(&rbd_dev->header.snap_rwsem); |
| 1268 | |
| 1269 | snap_seq = rbd_dev->header.snapc->seq; |
| 1270 | |
| 1271 | kfree(rbd_dev->header.snapc); |
| 1272 | kfree(rbd_dev->header.snap_names); |
| 1273 | kfree(rbd_dev->header.snap_sizes); |
| 1274 | |
| 1275 | rbd_dev->header.total_snaps = h.total_snaps; |
| 1276 | rbd_dev->header.snapc = h.snapc; |
| 1277 | rbd_dev->header.snap_names = h.snap_names; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1278 | rbd_dev->header.snap_names_len = h.snap_names_len; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1279 | rbd_dev->header.snap_sizes = h.snap_sizes; |
| 1280 | rbd_dev->header.snapc->seq = snap_seq; |
| 1281 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1282 | ret = __rbd_init_snaps_header(rbd_dev); |
| 1283 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1284 | up_write(&rbd_dev->header.snap_rwsem); |
| 1285 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1286 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1287 | } |
| 1288 | |
| 1289 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
| 1290 | { |
| 1291 | struct gendisk *disk; |
| 1292 | struct request_queue *q; |
| 1293 | int rc; |
| 1294 | u64 total_size = 0; |
| 1295 | |
| 1296 | /* contact OSD, request size info about the object being mapped */ |
| 1297 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); |
| 1298 | if (rc) |
| 1299 | return rc; |
| 1300 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1301 | /* no need to lock here, as rbd_dev is not registered yet */ |
| 1302 | rc = __rbd_init_snaps_header(rbd_dev); |
| 1303 | if (rc) |
| 1304 | return rc; |
| 1305 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1306 | rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); |
| 1307 | if (rc) |
| 1308 | return rc; |
| 1309 | |
| 1310 | /* create gendisk info */ |
| 1311 | rc = -ENOMEM; |
| 1312 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
| 1313 | if (!disk) |
| 1314 | goto out; |
| 1315 | |
| 1316 | sprintf(disk->disk_name, DRV_NAME "%d", rbd_dev->id); |
| 1317 | disk->major = rbd_dev->major; |
| 1318 | disk->first_minor = 0; |
| 1319 | disk->fops = &rbd_bd_ops; |
| 1320 | disk->private_data = rbd_dev; |
| 1321 | |
| 1322 | /* init rq */ |
| 1323 | rc = -ENOMEM; |
| 1324 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
| 1325 | if (!q) |
| 1326 | goto out_disk; |
| 1327 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
| 1328 | disk->queue = q; |
| 1329 | |
| 1330 | q->queuedata = rbd_dev; |
| 1331 | |
| 1332 | rbd_dev->disk = disk; |
| 1333 | rbd_dev->q = q; |
| 1334 | |
| 1335 | /* finally, announce the disk to the world */ |
| 1336 | set_capacity(disk, total_size / 512ULL); |
| 1337 | add_disk(disk); |
| 1338 | |
| 1339 | pr_info("%s: added with size 0x%llx\n", |
| 1340 | disk->disk_name, (unsigned long long)total_size); |
| 1341 | return 0; |
| 1342 | |
| 1343 | out_disk: |
| 1344 | put_disk(disk); |
| 1345 | out: |
| 1346 | return rc; |
| 1347 | } |
| 1348 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1349 | /* |
| 1350 | sysfs |
| 1351 | */ |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1352 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1353 | static ssize_t rbd_size_show(struct device *dev, |
| 1354 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1355 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1356 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1357 | |
| 1358 | 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] | 1359 | } |
| 1360 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1361 | static ssize_t rbd_major_show(struct device *dev, |
| 1362 | struct device_attribute *attr, char *buf) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1363 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1364 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1365 | |
| 1366 | return sprintf(buf, "%d\n", rbd_dev->major); |
| 1367 | } |
| 1368 | |
| 1369 | static ssize_t rbd_client_id_show(struct device *dev, |
| 1370 | struct device_attribute *attr, char *buf) |
| 1371 | { |
| 1372 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1373 | |
| 1374 | return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client)); |
| 1375 | } |
| 1376 | |
| 1377 | static ssize_t rbd_pool_show(struct device *dev, |
| 1378 | struct device_attribute *attr, char *buf) |
| 1379 | { |
| 1380 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1381 | |
| 1382 | return sprintf(buf, "%s\n", rbd_dev->pool_name); |
| 1383 | } |
| 1384 | |
| 1385 | static ssize_t rbd_name_show(struct device *dev, |
| 1386 | struct device_attribute *attr, char *buf) |
| 1387 | { |
| 1388 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1389 | |
| 1390 | return sprintf(buf, "%s\n", rbd_dev->obj); |
| 1391 | } |
| 1392 | |
| 1393 | static ssize_t rbd_snap_show(struct device *dev, |
| 1394 | struct device_attribute *attr, |
| 1395 | char *buf) |
| 1396 | { |
| 1397 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1398 | |
| 1399 | return sprintf(buf, "%s\n", rbd_dev->snap_name); |
| 1400 | } |
| 1401 | |
| 1402 | static ssize_t rbd_image_refresh(struct device *dev, |
| 1403 | struct device_attribute *attr, |
| 1404 | const char *buf, |
| 1405 | size_t size) |
| 1406 | { |
| 1407 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1408 | int rc; |
| 1409 | int ret = size; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1410 | |
| 1411 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1412 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1413 | rc = __rbd_update_snaps(rbd_dev); |
| 1414 | if (rc < 0) |
| 1415 | ret = rc; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1416 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1417 | mutex_unlock(&ctl_mutex); |
| 1418 | return ret; |
| 1419 | } |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1420 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1421 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
| 1422 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
| 1423 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
| 1424 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
| 1425 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
| 1426 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
| 1427 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); |
| 1428 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); |
| 1429 | static DEVICE_ATTR(rollback_snap, S_IWUSR, NULL, rbd_snap_rollback); |
| 1430 | |
| 1431 | static struct attribute *rbd_attrs[] = { |
| 1432 | &dev_attr_size.attr, |
| 1433 | &dev_attr_major.attr, |
| 1434 | &dev_attr_client_id.attr, |
| 1435 | &dev_attr_pool.attr, |
| 1436 | &dev_attr_name.attr, |
| 1437 | &dev_attr_current_snap.attr, |
| 1438 | &dev_attr_refresh.attr, |
| 1439 | &dev_attr_create_snap.attr, |
| 1440 | &dev_attr_rollback_snap.attr, |
| 1441 | NULL |
| 1442 | }; |
| 1443 | |
| 1444 | static struct attribute_group rbd_attr_group = { |
| 1445 | .attrs = rbd_attrs, |
| 1446 | }; |
| 1447 | |
| 1448 | static const struct attribute_group *rbd_attr_groups[] = { |
| 1449 | &rbd_attr_group, |
| 1450 | NULL |
| 1451 | }; |
| 1452 | |
| 1453 | static void rbd_sysfs_dev_release(struct device *dev) |
| 1454 | { |
| 1455 | } |
| 1456 | |
| 1457 | static struct device_type rbd_device_type = { |
| 1458 | .name = "rbd", |
| 1459 | .groups = rbd_attr_groups, |
| 1460 | .release = rbd_sysfs_dev_release, |
| 1461 | }; |
| 1462 | |
| 1463 | |
| 1464 | /* |
| 1465 | sysfs - snapshots |
| 1466 | */ |
| 1467 | |
| 1468 | static ssize_t rbd_snap_size_show(struct device *dev, |
| 1469 | struct device_attribute *attr, |
| 1470 | char *buf) |
| 1471 | { |
| 1472 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1473 | |
| 1474 | return sprintf(buf, "%lld\n", (long long)snap->size); |
| 1475 | } |
| 1476 | |
| 1477 | static ssize_t rbd_snap_id_show(struct device *dev, |
| 1478 | struct device_attribute *attr, |
| 1479 | char *buf) |
| 1480 | { |
| 1481 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1482 | |
| 1483 | return sprintf(buf, "%lld\n", (long long)snap->id); |
| 1484 | } |
| 1485 | |
| 1486 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
| 1487 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
| 1488 | |
| 1489 | static struct attribute *rbd_snap_attrs[] = { |
| 1490 | &dev_attr_snap_size.attr, |
| 1491 | &dev_attr_snap_id.attr, |
| 1492 | NULL, |
| 1493 | }; |
| 1494 | |
| 1495 | static struct attribute_group rbd_snap_attr_group = { |
| 1496 | .attrs = rbd_snap_attrs, |
| 1497 | }; |
| 1498 | |
| 1499 | static void rbd_snap_dev_release(struct device *dev) |
| 1500 | { |
| 1501 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| 1502 | kfree(snap->name); |
| 1503 | kfree(snap); |
| 1504 | } |
| 1505 | |
| 1506 | static const struct attribute_group *rbd_snap_attr_groups[] = { |
| 1507 | &rbd_snap_attr_group, |
| 1508 | NULL |
| 1509 | }; |
| 1510 | |
| 1511 | static struct device_type rbd_snap_device_type = { |
| 1512 | .groups = rbd_snap_attr_groups, |
| 1513 | .release = rbd_snap_dev_release, |
| 1514 | }; |
| 1515 | |
| 1516 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, |
| 1517 | struct rbd_snap *snap) |
| 1518 | { |
| 1519 | list_del(&snap->node); |
| 1520 | device_unregister(&snap->dev); |
| 1521 | } |
| 1522 | |
| 1523 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, |
| 1524 | struct rbd_snap *snap, |
| 1525 | struct device *parent) |
| 1526 | { |
| 1527 | struct device *dev = &snap->dev; |
| 1528 | int ret; |
| 1529 | |
| 1530 | dev->type = &rbd_snap_device_type; |
| 1531 | dev->parent = parent; |
| 1532 | dev->release = rbd_snap_dev_release; |
| 1533 | dev_set_name(dev, "snap_%s", snap->name); |
| 1534 | ret = device_register(dev); |
| 1535 | |
| 1536 | return ret; |
| 1537 | } |
| 1538 | |
| 1539 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, |
| 1540 | int i, const char *name, |
| 1541 | struct rbd_snap **snapp) |
| 1542 | { |
| 1543 | int ret; |
| 1544 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); |
| 1545 | if (!snap) |
| 1546 | return -ENOMEM; |
| 1547 | snap->name = kstrdup(name, GFP_KERNEL); |
| 1548 | snap->size = rbd_dev->header.snap_sizes[i]; |
| 1549 | snap->id = rbd_dev->header.snapc->snaps[i]; |
| 1550 | if (device_is_registered(&rbd_dev->dev)) { |
| 1551 | ret = rbd_register_snap_dev(rbd_dev, snap, |
| 1552 | &rbd_dev->dev); |
| 1553 | if (ret < 0) |
| 1554 | goto err; |
| 1555 | } |
| 1556 | *snapp = snap; |
| 1557 | return 0; |
| 1558 | err: |
| 1559 | kfree(snap->name); |
| 1560 | kfree(snap); |
| 1561 | return ret; |
| 1562 | } |
| 1563 | |
| 1564 | /* |
| 1565 | * search for the previous snap in a null delimited string list |
| 1566 | */ |
| 1567 | const char *rbd_prev_snap_name(const char *name, const char *start) |
| 1568 | { |
| 1569 | if (name < start + 2) |
| 1570 | return NULL; |
| 1571 | |
| 1572 | name -= 2; |
| 1573 | while (*name) { |
| 1574 | if (name == start) |
| 1575 | return start; |
| 1576 | name--; |
| 1577 | } |
| 1578 | return name + 1; |
| 1579 | } |
| 1580 | |
| 1581 | /* |
| 1582 | * compare the old list of snapshots that we have to what's in the header |
| 1583 | * and update it accordingly. Note that the header holds the snapshots |
| 1584 | * in a reverse order (from newest to oldest) and we need to go from |
| 1585 | * older to new so that we don't get a duplicate snap name when |
| 1586 | * doing the process (e.g., removed snapshot and recreated a new |
| 1587 | * one with the same name. |
| 1588 | */ |
| 1589 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) |
| 1590 | { |
| 1591 | const char *name, *first_name; |
| 1592 | int i = rbd_dev->header.total_snaps; |
| 1593 | struct rbd_snap *snap, *old_snap = NULL; |
| 1594 | int ret; |
| 1595 | struct list_head *p, *n; |
| 1596 | |
| 1597 | first_name = rbd_dev->header.snap_names; |
| 1598 | name = first_name + rbd_dev->header.snap_names_len; |
| 1599 | |
| 1600 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { |
| 1601 | u64 cur_id; |
| 1602 | |
| 1603 | old_snap = list_entry(p, struct rbd_snap, node); |
| 1604 | |
| 1605 | if (i) |
| 1606 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; |
| 1607 | |
| 1608 | if (!i || old_snap->id < cur_id) { |
| 1609 | /* old_snap->id was skipped, thus was removed */ |
| 1610 | __rbd_remove_snap_dev(rbd_dev, old_snap); |
| 1611 | continue; |
| 1612 | } |
| 1613 | if (old_snap->id == cur_id) { |
| 1614 | /* we have this snapshot already */ |
| 1615 | i--; |
| 1616 | name = rbd_prev_snap_name(name, first_name); |
| 1617 | continue; |
| 1618 | } |
| 1619 | for (; i > 0; |
| 1620 | i--, name = rbd_prev_snap_name(name, first_name)) { |
| 1621 | if (!name) { |
| 1622 | WARN_ON(1); |
| 1623 | return -EINVAL; |
| 1624 | } |
| 1625 | cur_id = rbd_dev->header.snapc->snaps[i]; |
| 1626 | /* snapshot removal? handle it above */ |
| 1627 | if (cur_id >= old_snap->id) |
| 1628 | break; |
| 1629 | /* a new snapshot */ |
| 1630 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); |
| 1631 | if (ret < 0) |
| 1632 | return ret; |
| 1633 | |
| 1634 | /* note that we add it backward so using n and not p */ |
| 1635 | list_add(&snap->node, n); |
| 1636 | p = &snap->node; |
| 1637 | } |
| 1638 | } |
| 1639 | /* we're done going over the old snap list, just add what's left */ |
| 1640 | for (; i > 0; i--) { |
| 1641 | name = rbd_prev_snap_name(name, first_name); |
| 1642 | if (!name) { |
| 1643 | WARN_ON(1); |
| 1644 | return -EINVAL; |
| 1645 | } |
| 1646 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); |
| 1647 | if (ret < 0) |
| 1648 | return ret; |
| 1649 | list_add(&snap->node, &rbd_dev->snaps); |
| 1650 | } |
| 1651 | |
| 1652 | return 0; |
| 1653 | } |
| 1654 | |
| 1655 | |
| 1656 | static void rbd_root_dev_release(struct device *dev) |
| 1657 | { |
| 1658 | } |
| 1659 | |
| 1660 | static struct device rbd_root_dev = { |
| 1661 | .init_name = "rbd", |
| 1662 | .release = rbd_root_dev_release, |
| 1663 | }; |
| 1664 | |
| 1665 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
| 1666 | { |
| 1667 | int ret = -ENOMEM; |
| 1668 | struct device *dev; |
| 1669 | struct rbd_snap *snap; |
| 1670 | |
| 1671 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1672 | dev = &rbd_dev->dev; |
| 1673 | |
| 1674 | dev->bus = &rbd_bus_type; |
| 1675 | dev->type = &rbd_device_type; |
| 1676 | dev->parent = &rbd_root_dev; |
| 1677 | dev->release = rbd_dev_release; |
| 1678 | dev_set_name(dev, "%d", rbd_dev->id); |
| 1679 | ret = device_register(dev); |
| 1680 | if (ret < 0) |
| 1681 | goto done_free; |
| 1682 | |
| 1683 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
| 1684 | ret = rbd_register_snap_dev(rbd_dev, snap, |
| 1685 | &rbd_dev->dev); |
| 1686 | if (ret < 0) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1687 | break; |
| 1688 | } |
| 1689 | |
| 1690 | mutex_unlock(&ctl_mutex); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1691 | return 0; |
| 1692 | done_free: |
| 1693 | mutex_unlock(&ctl_mutex); |
| 1694 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1695 | } |
| 1696 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1697 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
| 1698 | { |
| 1699 | device_unregister(&rbd_dev->dev); |
| 1700 | } |
| 1701 | |
| 1702 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1703 | { |
| 1704 | struct ceph_osd_client *osdc; |
| 1705 | struct rbd_device *rbd_dev; |
| 1706 | ssize_t rc = -ENOMEM; |
| 1707 | int irc, new_id = 0; |
| 1708 | struct list_head *tmp; |
| 1709 | char *mon_dev_name; |
| 1710 | char *options; |
| 1711 | |
| 1712 | if (!try_module_get(THIS_MODULE)) |
| 1713 | return -ENODEV; |
| 1714 | |
| 1715 | mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); |
| 1716 | if (!mon_dev_name) |
| 1717 | goto err_out_mod; |
| 1718 | |
| 1719 | options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); |
| 1720 | if (!options) |
| 1721 | goto err_mon_dev; |
| 1722 | |
| 1723 | /* new rbd_device object */ |
| 1724 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
| 1725 | if (!rbd_dev) |
| 1726 | goto err_out_opt; |
| 1727 | |
| 1728 | /* static rbd_device initialization */ |
| 1729 | spin_lock_init(&rbd_dev->lock); |
| 1730 | INIT_LIST_HEAD(&rbd_dev->node); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1731 | INIT_LIST_HEAD(&rbd_dev->snaps); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1732 | |
| 1733 | /* generate unique id: find highest unique id, add one */ |
| 1734 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1735 | |
| 1736 | list_for_each(tmp, &rbd_dev_list) { |
| 1737 | struct rbd_device *rbd_dev; |
| 1738 | |
| 1739 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
| 1740 | if (rbd_dev->id >= new_id) |
| 1741 | new_id = rbd_dev->id + 1; |
| 1742 | } |
| 1743 | |
| 1744 | rbd_dev->id = new_id; |
| 1745 | |
| 1746 | /* add to global list */ |
| 1747 | list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| 1748 | |
| 1749 | /* parse add command */ |
| 1750 | if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s " |
| 1751 | "%" __stringify(RBD_MAX_OPT_LEN) "s " |
| 1752 | "%" __stringify(RBD_MAX_POOL_NAME_LEN) "s " |
| 1753 | "%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s" |
| 1754 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", |
| 1755 | mon_dev_name, options, rbd_dev->pool_name, |
| 1756 | rbd_dev->obj, rbd_dev->snap_name) < 4) { |
| 1757 | rc = -EINVAL; |
| 1758 | goto err_out_slot; |
| 1759 | } |
| 1760 | |
| 1761 | if (rbd_dev->snap_name[0] == 0) |
| 1762 | rbd_dev->snap_name[0] = '-'; |
| 1763 | |
| 1764 | rbd_dev->obj_len = strlen(rbd_dev->obj); |
| 1765 | snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s", |
| 1766 | rbd_dev->obj, RBD_SUFFIX); |
| 1767 | |
| 1768 | /* initialize rest of new object */ |
| 1769 | snprintf(rbd_dev->name, DEV_NAME_LEN, DRV_NAME "%d", rbd_dev->id); |
| 1770 | rc = rbd_get_client(rbd_dev, mon_dev_name, options); |
| 1771 | if (rc < 0) |
| 1772 | goto err_out_slot; |
| 1773 | |
| 1774 | mutex_unlock(&ctl_mutex); |
| 1775 | |
| 1776 | /* pick the pool */ |
| 1777 | osdc = &rbd_dev->client->osdc; |
| 1778 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
| 1779 | if (rc < 0) |
| 1780 | goto err_out_client; |
| 1781 | rbd_dev->poolid = rc; |
| 1782 | |
| 1783 | /* register our block device */ |
| 1784 | irc = register_blkdev(0, rbd_dev->name); |
| 1785 | if (irc < 0) { |
| 1786 | rc = irc; |
| 1787 | goto err_out_client; |
| 1788 | } |
| 1789 | rbd_dev->major = irc; |
| 1790 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1791 | rc = rbd_bus_add_dev(rbd_dev); |
| 1792 | if (rc) |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame^] | 1793 | goto err_out_blkdev; |
| 1794 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1795 | /* set up and announce blkdev mapping */ |
| 1796 | rc = rbd_init_disk(rbd_dev); |
| 1797 | if (rc) |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame^] | 1798 | goto err_out_bus; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1799 | |
| 1800 | return count; |
| 1801 | |
Yehuda Sadeh | 766fc43 | 2011-01-07 14:58:42 -0800 | [diff] [blame^] | 1802 | err_out_bus: |
| 1803 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1804 | list_del_init(&rbd_dev->node); |
| 1805 | mutex_unlock(&ctl_mutex); |
| 1806 | |
| 1807 | /* this will also clean up rest of rbd_dev stuff */ |
| 1808 | |
| 1809 | rbd_bus_del_dev(rbd_dev); |
| 1810 | kfree(options); |
| 1811 | kfree(mon_dev_name); |
| 1812 | return rc; |
| 1813 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1814 | err_out_blkdev: |
| 1815 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| 1816 | err_out_client: |
| 1817 | rbd_put_client(rbd_dev); |
| 1818 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1819 | err_out_slot: |
| 1820 | list_del_init(&rbd_dev->node); |
| 1821 | mutex_unlock(&ctl_mutex); |
| 1822 | |
| 1823 | kfree(rbd_dev); |
| 1824 | err_out_opt: |
| 1825 | kfree(options); |
| 1826 | err_mon_dev: |
| 1827 | kfree(mon_dev_name); |
| 1828 | err_out_mod: |
| 1829 | dout("Error adding device %s\n", buf); |
| 1830 | module_put(THIS_MODULE); |
| 1831 | return rc; |
| 1832 | } |
| 1833 | |
| 1834 | static struct rbd_device *__rbd_get_dev(unsigned long id) |
| 1835 | { |
| 1836 | struct list_head *tmp; |
| 1837 | struct rbd_device *rbd_dev; |
| 1838 | |
| 1839 | list_for_each(tmp, &rbd_dev_list) { |
| 1840 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
| 1841 | if (rbd_dev->id == id) |
| 1842 | return rbd_dev; |
| 1843 | } |
| 1844 | return NULL; |
| 1845 | } |
| 1846 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1847 | static void rbd_dev_release(struct device *dev) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1848 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1849 | struct rbd_device *rbd_dev = |
| 1850 | container_of(dev, struct rbd_device, dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1851 | |
| 1852 | rbd_put_client(rbd_dev); |
| 1853 | |
| 1854 | /* clean up and free blkdev */ |
| 1855 | rbd_free_disk(rbd_dev); |
| 1856 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| 1857 | kfree(rbd_dev); |
| 1858 | |
| 1859 | /* release module ref */ |
| 1860 | module_put(THIS_MODULE); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1861 | } |
| 1862 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1863 | static ssize_t rbd_remove(struct bus_type *bus, |
| 1864 | const char *buf, |
| 1865 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1866 | { |
| 1867 | struct rbd_device *rbd_dev = NULL; |
| 1868 | int target_id, rc; |
| 1869 | unsigned long ul; |
| 1870 | int ret = count; |
| 1871 | |
| 1872 | rc = strict_strtoul(buf, 10, &ul); |
| 1873 | if (rc) |
| 1874 | return rc; |
| 1875 | |
| 1876 | /* convert to int; abort if we lost anything in the conversion */ |
| 1877 | target_id = (int) ul; |
| 1878 | if (target_id != ul) |
| 1879 | return -EINVAL; |
| 1880 | |
| 1881 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1882 | |
| 1883 | rbd_dev = __rbd_get_dev(target_id); |
| 1884 | if (!rbd_dev) { |
| 1885 | ret = -ENOENT; |
| 1886 | goto done; |
| 1887 | } |
| 1888 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1889 | list_del_init(&rbd_dev->node); |
| 1890 | |
| 1891 | __rbd_remove_all_snaps(rbd_dev); |
| 1892 | rbd_bus_del_dev(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1893 | |
| 1894 | done: |
| 1895 | mutex_unlock(&ctl_mutex); |
| 1896 | return ret; |
| 1897 | } |
| 1898 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1899 | static ssize_t rbd_snap_add(struct device *dev, |
| 1900 | struct device_attribute *attr, |
| 1901 | const char *buf, |
| 1902 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1903 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1904 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1905 | int ret; |
| 1906 | char *name = kmalloc(count + 1, GFP_KERNEL); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1907 | if (!name) |
| 1908 | return -ENOMEM; |
| 1909 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1910 | snprintf(name, count, "%s", buf); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1911 | |
| 1912 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 1913 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1914 | ret = rbd_header_add_snap(rbd_dev, |
| 1915 | name, GFP_KERNEL); |
| 1916 | if (ret < 0) |
| 1917 | goto done_unlock; |
| 1918 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1919 | ret = __rbd_update_snaps(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1920 | if (ret < 0) |
| 1921 | goto done_unlock; |
| 1922 | |
| 1923 | ret = count; |
| 1924 | done_unlock: |
| 1925 | mutex_unlock(&ctl_mutex); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1926 | kfree(name); |
| 1927 | return ret; |
| 1928 | } |
| 1929 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1930 | static ssize_t rbd_snap_rollback(struct device *dev, |
| 1931 | struct device_attribute *attr, |
| 1932 | const char *buf, |
| 1933 | size_t count) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1934 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1935 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
| 1936 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1937 | u64 snapid; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1938 | u64 cur_ofs; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1939 | char *seg_name = NULL; |
| 1940 | char *snap_name = kmalloc(count + 1, GFP_KERNEL); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1941 | ret = -ENOMEM; |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1942 | if (!snap_name) |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1943 | return ret; |
| 1944 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1945 | /* parse snaps add command */ |
| 1946 | snprintf(snap_name, count, "%s", buf); |
| 1947 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
| 1948 | if (!seg_name) |
| 1949 | goto done; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1950 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1951 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1952 | |
| 1953 | ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL); |
| 1954 | if (ret < 0) |
| 1955 | goto done_unlock; |
| 1956 | |
| 1957 | dout("snapid=%lld\n", snapid); |
| 1958 | |
| 1959 | cur_ofs = 0; |
| 1960 | while (cur_ofs < rbd_dev->header.image_size) { |
| 1961 | cur_ofs += rbd_get_segment(&rbd_dev->header, |
| 1962 | rbd_dev->obj, |
| 1963 | cur_ofs, (u64)-1, |
| 1964 | seg_name, NULL); |
| 1965 | dout("seg_name=%s\n", seg_name); |
| 1966 | |
| 1967 | ret = rbd_req_sync_rollback_obj(rbd_dev, snapid, seg_name); |
| 1968 | if (ret < 0) |
| 1969 | pr_warning("could not roll back obj %s err=%d\n", |
| 1970 | seg_name, ret); |
| 1971 | } |
| 1972 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1973 | ret = __rbd_update_snaps(rbd_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1974 | if (ret < 0) |
| 1975 | goto done_unlock; |
| 1976 | |
| 1977 | ret = count; |
| 1978 | |
| 1979 | done_unlock: |
| 1980 | mutex_unlock(&ctl_mutex); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1981 | done: |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1982 | kfree(seg_name); |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1983 | kfree(snap_name); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1984 | |
| 1985 | return ret; |
| 1986 | } |
| 1987 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1988 | static struct bus_attribute rbd_bus_attrs[] = { |
| 1989 | __ATTR(add, S_IWUSR, NULL, rbd_add), |
| 1990 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1991 | __ATTR_NULL |
| 1992 | }; |
| 1993 | |
| 1994 | /* |
| 1995 | * create control files in sysfs |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 1996 | * /sys/bus/rbd/... |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 1997 | */ |
| 1998 | static int rbd_sysfs_init(void) |
| 1999 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2000 | int ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2001 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2002 | rbd_bus_type.bus_attrs = rbd_bus_attrs; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2003 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2004 | ret = bus_register(&rbd_bus_type); |
| 2005 | if (ret < 0) |
| 2006 | return ret; |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2007 | |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2008 | ret = device_register(&rbd_root_dev); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2009 | |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2010 | return ret; |
| 2011 | } |
| 2012 | |
| 2013 | static void rbd_sysfs_cleanup(void) |
| 2014 | { |
Yehuda Sadeh | dfc5606 | 2010-11-19 14:51:04 -0800 | [diff] [blame] | 2015 | device_unregister(&rbd_root_dev); |
| 2016 | bus_unregister(&rbd_bus_type); |
Yehuda Sadeh | 602adf4 | 2010-08-12 16:11:25 -0700 | [diff] [blame] | 2017 | } |
| 2018 | |
| 2019 | int __init rbd_init(void) |
| 2020 | { |
| 2021 | int rc; |
| 2022 | |
| 2023 | rc = rbd_sysfs_init(); |
| 2024 | if (rc) |
| 2025 | return rc; |
| 2026 | spin_lock_init(&node_lock); |
| 2027 | pr_info("loaded " DRV_NAME_LONG "\n"); |
| 2028 | return 0; |
| 2029 | } |
| 2030 | |
| 2031 | void __exit rbd_exit(void) |
| 2032 | { |
| 2033 | rbd_sysfs_cleanup(); |
| 2034 | } |
| 2035 | |
| 2036 | module_init(rbd_init); |
| 2037 | module_exit(rbd_exit); |
| 2038 | |
| 2039 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| 2040 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
| 2041 | MODULE_DESCRIPTION("rados block device"); |
| 2042 | |
| 2043 | /* following authorship retained from original osdblk.c */ |
| 2044 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| 2045 | |
| 2046 | MODULE_LICENSE("GPL"); |