| 1 | |
| 2 | /* |
| 3 | rbd.c -- Export ceph rados objects as a Linux block device |
| 4 | |
| 5 | |
| 6 | based on drivers/block/osdblk.c: |
| 7 | |
| 8 | Copyright 2009 Red Hat, Inc. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; see the file COPYING. If not, write to |
| 21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | |
| 23 | |
| 24 | |
| 25 | For usage instructions, please refer to: |
| 26 | |
| 27 | Documentation/ABI/testing/sysfs-bus-rbd |
| 28 | |
| 29 | */ |
| 30 | |
| 31 | #include <linux/ceph/libceph.h> |
| 32 | #include <linux/ceph/osd_client.h> |
| 33 | #include <linux/ceph/mon_client.h> |
| 34 | #include <linux/ceph/cls_lock_client.h> |
| 35 | #include <linux/ceph/striper.h> |
| 36 | #include <linux/ceph/decode.h> |
| 37 | #include <linux/parser.h> |
| 38 | #include <linux/bsearch.h> |
| 39 | |
| 40 | #include <linux/kernel.h> |
| 41 | #include <linux/device.h> |
| 42 | #include <linux/module.h> |
| 43 | #include <linux/blk-mq.h> |
| 44 | #include <linux/fs.h> |
| 45 | #include <linux/blkdev.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/idr.h> |
| 48 | #include <linux/workqueue.h> |
| 49 | |
| 50 | #include "rbd_types.h" |
| 51 | |
| 52 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
| 53 | |
| 54 | /* |
| 55 | * Increment the given counter and return its updated value. |
| 56 | * If the counter is already 0 it will not be incremented. |
| 57 | * If the counter is already at its maximum value returns |
| 58 | * -EINVAL without updating it. |
| 59 | */ |
| 60 | static int atomic_inc_return_safe(atomic_t *v) |
| 61 | { |
| 62 | unsigned int counter; |
| 63 | |
| 64 | counter = (unsigned int)atomic_fetch_add_unless(v, 1, 0); |
| 65 | if (counter <= (unsigned int)INT_MAX) |
| 66 | return (int)counter; |
| 67 | |
| 68 | atomic_dec(v); |
| 69 | |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | |
| 73 | /* Decrement the counter. Return the resulting value, or -EINVAL */ |
| 74 | static int atomic_dec_return_safe(atomic_t *v) |
| 75 | { |
| 76 | int counter; |
| 77 | |
| 78 | counter = atomic_dec_return(v); |
| 79 | if (counter >= 0) |
| 80 | return counter; |
| 81 | |
| 82 | atomic_inc(v); |
| 83 | |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
| 87 | #define RBD_DRV_NAME "rbd" |
| 88 | |
| 89 | #define RBD_MINORS_PER_MAJOR 256 |
| 90 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 |
| 91 | |
| 92 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
| 93 | |
| 94 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
| 95 | #define RBD_MAX_SNAP_NAME_LEN \ |
| 96 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) |
| 97 | |
| 98 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
| 99 | |
| 100 | #define RBD_SNAP_HEAD_NAME "-" |
| 101 | |
| 102 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
| 103 | |
| 104 | /* This allows a single page to hold an image name sent by OSD */ |
| 105 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) |
| 106 | #define RBD_IMAGE_ID_LEN_MAX 64 |
| 107 | |
| 108 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
| 109 | |
| 110 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
| 111 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
| 112 | |
| 113 | /* Feature bits */ |
| 114 | |
| 115 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
| 116 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) |
| 117 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) |
| 118 | #define RBD_FEATURE_OBJECT_MAP (1ULL<<3) |
| 119 | #define RBD_FEATURE_FAST_DIFF (1ULL<<4) |
| 120 | #define RBD_FEATURE_DEEP_FLATTEN (1ULL<<5) |
| 121 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) |
| 122 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
| 123 | |
| 124 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
| 125 | RBD_FEATURE_STRIPINGV2 | \ |
| 126 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
| 127 | RBD_FEATURE_OBJECT_MAP | \ |
| 128 | RBD_FEATURE_FAST_DIFF | \ |
| 129 | RBD_FEATURE_DEEP_FLATTEN | \ |
| 130 | RBD_FEATURE_DATA_POOL | \ |
| 131 | RBD_FEATURE_OPERATIONS) |
| 132 | |
| 133 | /* Features supported by this (client software) implementation. */ |
| 134 | |
| 135 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
| 136 | |
| 137 | /* |
| 138 | * An RBD device name will be "rbd#", where the "rbd" comes from |
| 139 | * RBD_DRV_NAME above, and # is a unique integer identifier. |
| 140 | */ |
| 141 | #define DEV_NAME_LEN 32 |
| 142 | |
| 143 | /* |
| 144 | * block device image metadata (in-memory version) |
| 145 | */ |
| 146 | struct rbd_image_header { |
| 147 | /* These six fields never change for a given rbd image */ |
| 148 | char *object_prefix; |
| 149 | __u8 obj_order; |
| 150 | u64 stripe_unit; |
| 151 | u64 stripe_count; |
| 152 | s64 data_pool_id; |
| 153 | u64 features; /* Might be changeable someday? */ |
| 154 | |
| 155 | /* The remaining fields need to be updated occasionally */ |
| 156 | u64 image_size; |
| 157 | struct ceph_snap_context *snapc; |
| 158 | char *snap_names; /* format 1 only */ |
| 159 | u64 *snap_sizes; /* format 1 only */ |
| 160 | }; |
| 161 | |
| 162 | /* |
| 163 | * An rbd image specification. |
| 164 | * |
| 165 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely |
| 166 | * identify an image. Each rbd_dev structure includes a pointer to |
| 167 | * an rbd_spec structure that encapsulates this identity. |
| 168 | * |
| 169 | * Each of the id's in an rbd_spec has an associated name. For a |
| 170 | * user-mapped image, the names are supplied and the id's associated |
| 171 | * with them are looked up. For a layered image, a parent image is |
| 172 | * defined by the tuple, and the names are looked up. |
| 173 | * |
| 174 | * An rbd_dev structure contains a parent_spec pointer which is |
| 175 | * non-null if the image it represents is a child in a layered |
| 176 | * image. This pointer will refer to the rbd_spec structure used |
| 177 | * by the parent rbd_dev for its own identity (i.e., the structure |
| 178 | * is shared between the parent and child). |
| 179 | * |
| 180 | * Since these structures are populated once, during the discovery |
| 181 | * phase of image construction, they are effectively immutable so |
| 182 | * we make no effort to synchronize access to them. |
| 183 | * |
| 184 | * Note that code herein does not assume the image name is known (it |
| 185 | * could be a null pointer). |
| 186 | */ |
| 187 | struct rbd_spec { |
| 188 | u64 pool_id; |
| 189 | const char *pool_name; |
| 190 | const char *pool_ns; /* NULL if default, never "" */ |
| 191 | |
| 192 | const char *image_id; |
| 193 | const char *image_name; |
| 194 | |
| 195 | u64 snap_id; |
| 196 | const char *snap_name; |
| 197 | |
| 198 | struct kref kref; |
| 199 | }; |
| 200 | |
| 201 | /* |
| 202 | * an instance of the client. multiple devices may share an rbd client. |
| 203 | */ |
| 204 | struct rbd_client { |
| 205 | struct ceph_client *client; |
| 206 | struct kref kref; |
| 207 | struct list_head node; |
| 208 | }; |
| 209 | |
| 210 | struct pending_result { |
| 211 | int result; /* first nonzero result */ |
| 212 | int num_pending; |
| 213 | }; |
| 214 | |
| 215 | struct rbd_img_request; |
| 216 | |
| 217 | enum obj_request_type { |
| 218 | OBJ_REQUEST_NODATA = 1, |
| 219 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
| 220 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
| 221 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
| 222 | }; |
| 223 | |
| 224 | enum obj_operation_type { |
| 225 | OBJ_OP_READ = 1, |
| 226 | OBJ_OP_WRITE, |
| 227 | OBJ_OP_DISCARD, |
| 228 | OBJ_OP_ZEROOUT, |
| 229 | }; |
| 230 | |
| 231 | #define RBD_OBJ_FLAG_DELETION (1U << 0) |
| 232 | #define RBD_OBJ_FLAG_COPYUP_ENABLED (1U << 1) |
| 233 | #define RBD_OBJ_FLAG_COPYUP_ZEROS (1U << 2) |
| 234 | #define RBD_OBJ_FLAG_MAY_EXIST (1U << 3) |
| 235 | #define RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT (1U << 4) |
| 236 | |
| 237 | enum rbd_obj_read_state { |
| 238 | RBD_OBJ_READ_START = 1, |
| 239 | RBD_OBJ_READ_OBJECT, |
| 240 | RBD_OBJ_READ_PARENT, |
| 241 | }; |
| 242 | |
| 243 | /* |
| 244 | * Writes go through the following state machine to deal with |
| 245 | * layering: |
| 246 | * |
| 247 | * . . . . . RBD_OBJ_WRITE_GUARD. . . . . . . . . . . . . . |
| 248 | * . | . |
| 249 | * . v . |
| 250 | * . RBD_OBJ_WRITE_READ_FROM_PARENT. . . . |
| 251 | * . | . . |
| 252 | * . v v (deep-copyup . |
| 253 | * (image . RBD_OBJ_WRITE_COPYUP_EMPTY_SNAPC . not needed) . |
| 254 | * flattened) v | . . |
| 255 | * . v . . |
| 256 | * . . . .RBD_OBJ_WRITE_COPYUP_OPS. . . . . (copyup . |
| 257 | * | not needed) v |
| 258 | * v . |
| 259 | * done . . . . . . . . . . . . . . . . . . |
| 260 | * ^ |
| 261 | * | |
| 262 | * RBD_OBJ_WRITE_FLAT |
| 263 | * |
| 264 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether |
| 265 | * assert_exists guard is needed or not (in some cases it's not needed |
| 266 | * even if there is a parent). |
| 267 | */ |
| 268 | enum rbd_obj_write_state { |
| 269 | RBD_OBJ_WRITE_START = 1, |
| 270 | RBD_OBJ_WRITE_PRE_OBJECT_MAP, |
| 271 | RBD_OBJ_WRITE_OBJECT, |
| 272 | __RBD_OBJ_WRITE_COPYUP, |
| 273 | RBD_OBJ_WRITE_COPYUP, |
| 274 | RBD_OBJ_WRITE_POST_OBJECT_MAP, |
| 275 | }; |
| 276 | |
| 277 | enum rbd_obj_copyup_state { |
| 278 | RBD_OBJ_COPYUP_START = 1, |
| 279 | RBD_OBJ_COPYUP_READ_PARENT, |
| 280 | __RBD_OBJ_COPYUP_OBJECT_MAPS, |
| 281 | RBD_OBJ_COPYUP_OBJECT_MAPS, |
| 282 | __RBD_OBJ_COPYUP_WRITE_OBJECT, |
| 283 | RBD_OBJ_COPYUP_WRITE_OBJECT, |
| 284 | }; |
| 285 | |
| 286 | struct rbd_obj_request { |
| 287 | struct ceph_object_extent ex; |
| 288 | unsigned int flags; /* RBD_OBJ_FLAG_* */ |
| 289 | union { |
| 290 | enum rbd_obj_read_state read_state; /* for reads */ |
| 291 | enum rbd_obj_write_state write_state; /* for writes */ |
| 292 | }; |
| 293 | |
| 294 | struct rbd_img_request *img_request; |
| 295 | struct ceph_file_extent *img_extents; |
| 296 | u32 num_img_extents; |
| 297 | |
| 298 | union { |
| 299 | struct ceph_bio_iter bio_pos; |
| 300 | struct { |
| 301 | struct ceph_bvec_iter bvec_pos; |
| 302 | u32 bvec_count; |
| 303 | u32 bvec_idx; |
| 304 | }; |
| 305 | }; |
| 306 | |
| 307 | enum rbd_obj_copyup_state copyup_state; |
| 308 | struct bio_vec *copyup_bvecs; |
| 309 | u32 copyup_bvec_count; |
| 310 | |
| 311 | struct list_head osd_reqs; /* w/ r_private_item */ |
| 312 | |
| 313 | struct mutex state_mutex; |
| 314 | struct pending_result pending; |
| 315 | struct kref kref; |
| 316 | }; |
| 317 | |
| 318 | enum img_req_flags { |
| 319 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
| 320 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
| 321 | }; |
| 322 | |
| 323 | enum rbd_img_state { |
| 324 | RBD_IMG_START = 1, |
| 325 | RBD_IMG_EXCLUSIVE_LOCK, |
| 326 | __RBD_IMG_OBJECT_REQUESTS, |
| 327 | RBD_IMG_OBJECT_REQUESTS, |
| 328 | }; |
| 329 | |
| 330 | struct rbd_img_request { |
| 331 | struct rbd_device *rbd_dev; |
| 332 | enum obj_operation_type op_type; |
| 333 | enum obj_request_type data_type; |
| 334 | unsigned long flags; |
| 335 | enum rbd_img_state state; |
| 336 | union { |
| 337 | u64 snap_id; /* for reads */ |
| 338 | struct ceph_snap_context *snapc; /* for writes */ |
| 339 | }; |
| 340 | union { |
| 341 | struct request *rq; /* block request */ |
| 342 | struct rbd_obj_request *obj_request; /* obj req initiator */ |
| 343 | }; |
| 344 | |
| 345 | struct list_head lock_item; |
| 346 | struct list_head object_extents; /* obj_req.ex structs */ |
| 347 | |
| 348 | struct mutex state_mutex; |
| 349 | struct pending_result pending; |
| 350 | struct work_struct work; |
| 351 | int work_result; |
| 352 | struct kref kref; |
| 353 | }; |
| 354 | |
| 355 | #define for_each_obj_request(ireq, oreq) \ |
| 356 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
| 357 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
| 358 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
| 359 | |
| 360 | enum rbd_watch_state { |
| 361 | RBD_WATCH_STATE_UNREGISTERED, |
| 362 | RBD_WATCH_STATE_REGISTERED, |
| 363 | RBD_WATCH_STATE_ERROR, |
| 364 | }; |
| 365 | |
| 366 | enum rbd_lock_state { |
| 367 | RBD_LOCK_STATE_UNLOCKED, |
| 368 | RBD_LOCK_STATE_LOCKED, |
| 369 | RBD_LOCK_STATE_RELEASING, |
| 370 | }; |
| 371 | |
| 372 | /* WatchNotify::ClientId */ |
| 373 | struct rbd_client_id { |
| 374 | u64 gid; |
| 375 | u64 handle; |
| 376 | }; |
| 377 | |
| 378 | struct rbd_mapping { |
| 379 | u64 size; |
| 380 | u64 features; |
| 381 | }; |
| 382 | |
| 383 | /* |
| 384 | * a single device |
| 385 | */ |
| 386 | struct rbd_device { |
| 387 | int dev_id; /* blkdev unique id */ |
| 388 | |
| 389 | int major; /* blkdev assigned major */ |
| 390 | int minor; |
| 391 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
| 392 | |
| 393 | u32 image_format; /* Either 1 or 2 */ |
| 394 | struct rbd_client *rbd_client; |
| 395 | |
| 396 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
| 397 | |
| 398 | spinlock_t lock; /* queue, flags, open_count */ |
| 399 | |
| 400 | struct rbd_image_header header; |
| 401 | unsigned long flags; /* possibly lock protected */ |
| 402 | struct rbd_spec *spec; |
| 403 | struct rbd_options *opts; |
| 404 | char *config_info; /* add{,_single_major} string */ |
| 405 | |
| 406 | struct ceph_object_id header_oid; |
| 407 | struct ceph_object_locator header_oloc; |
| 408 | |
| 409 | struct ceph_file_layout layout; /* used for all rbd requests */ |
| 410 | |
| 411 | struct mutex watch_mutex; |
| 412 | enum rbd_watch_state watch_state; |
| 413 | struct ceph_osd_linger_request *watch_handle; |
| 414 | u64 watch_cookie; |
| 415 | struct delayed_work watch_dwork; |
| 416 | |
| 417 | struct rw_semaphore lock_rwsem; |
| 418 | enum rbd_lock_state lock_state; |
| 419 | char lock_cookie[32]; |
| 420 | struct rbd_client_id owner_cid; |
| 421 | struct work_struct acquired_lock_work; |
| 422 | struct work_struct released_lock_work; |
| 423 | struct delayed_work lock_dwork; |
| 424 | struct work_struct unlock_work; |
| 425 | spinlock_t lock_lists_lock; |
| 426 | struct list_head acquiring_list; |
| 427 | struct list_head running_list; |
| 428 | struct completion acquire_wait; |
| 429 | int acquire_err; |
| 430 | struct completion releasing_wait; |
| 431 | |
| 432 | spinlock_t object_map_lock; |
| 433 | u8 *object_map; |
| 434 | u64 object_map_size; /* in objects */ |
| 435 | u64 object_map_flags; |
| 436 | |
| 437 | struct workqueue_struct *task_wq; |
| 438 | |
| 439 | struct rbd_spec *parent_spec; |
| 440 | u64 parent_overlap; |
| 441 | atomic_t parent_ref; |
| 442 | struct rbd_device *parent; |
| 443 | |
| 444 | /* Block layer tags. */ |
| 445 | struct blk_mq_tag_set tag_set; |
| 446 | |
| 447 | /* protects updating the header */ |
| 448 | struct rw_semaphore header_rwsem; |
| 449 | |
| 450 | struct rbd_mapping mapping; |
| 451 | |
| 452 | struct list_head node; |
| 453 | |
| 454 | /* sysfs related */ |
| 455 | struct device dev; |
| 456 | unsigned long open_count; /* protected by lock */ |
| 457 | }; |
| 458 | |
| 459 | /* |
| 460 | * Flag bits for rbd_dev->flags: |
| 461 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected |
| 462 | * by rbd_dev->lock |
| 463 | */ |
| 464 | enum rbd_dev_flags { |
| 465 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ |
| 466 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
| 467 | }; |
| 468 | |
| 469 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
| 470 | |
| 471 | static LIST_HEAD(rbd_dev_list); /* devices */ |
| 472 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
| 473 | |
| 474 | static LIST_HEAD(rbd_client_list); /* clients */ |
| 475 | static DEFINE_SPINLOCK(rbd_client_list_lock); |
| 476 | |
| 477 | /* Slab caches for frequently-allocated structures */ |
| 478 | |
| 479 | static struct kmem_cache *rbd_img_request_cache; |
| 480 | static struct kmem_cache *rbd_obj_request_cache; |
| 481 | |
| 482 | static int rbd_major; |
| 483 | static DEFINE_IDA(rbd_dev_id_ida); |
| 484 | |
| 485 | static struct workqueue_struct *rbd_wq; |
| 486 | |
| 487 | static struct ceph_snap_context rbd_empty_snapc = { |
| 488 | .nref = REFCOUNT_INIT(1), |
| 489 | }; |
| 490 | |
| 491 | /* |
| 492 | * single-major requires >= 0.75 version of userspace rbd utility. |
| 493 | */ |
| 494 | static bool single_major = true; |
| 495 | module_param(single_major, bool, 0444); |
| 496 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
| 497 | |
| 498 | static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count); |
| 499 | static ssize_t remove_store(struct bus_type *bus, const char *buf, |
| 500 | size_t count); |
| 501 | static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, |
| 502 | size_t count); |
| 503 | static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, |
| 504 | size_t count); |
| 505 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
| 506 | |
| 507 | static int rbd_dev_id_to_minor(int dev_id) |
| 508 | { |
| 509 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
| 510 | } |
| 511 | |
| 512 | static int minor_to_rbd_dev_id(int minor) |
| 513 | { |
| 514 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
| 515 | } |
| 516 | |
| 517 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
| 518 | { |
| 519 | lockdep_assert_held(&rbd_dev->lock_rwsem); |
| 520 | |
| 521 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || |
| 522 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; |
| 523 | } |
| 524 | |
| 525 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) |
| 526 | { |
| 527 | bool is_lock_owner; |
| 528 | |
| 529 | down_read(&rbd_dev->lock_rwsem); |
| 530 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); |
| 531 | up_read(&rbd_dev->lock_rwsem); |
| 532 | return is_lock_owner; |
| 533 | } |
| 534 | |
| 535 | static ssize_t supported_features_show(struct bus_type *bus, char *buf) |
| 536 | { |
| 537 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); |
| 538 | } |
| 539 | |
| 540 | static BUS_ATTR_WO(add); |
| 541 | static BUS_ATTR_WO(remove); |
| 542 | static BUS_ATTR_WO(add_single_major); |
| 543 | static BUS_ATTR_WO(remove_single_major); |
| 544 | static BUS_ATTR_RO(supported_features); |
| 545 | |
| 546 | static struct attribute *rbd_bus_attrs[] = { |
| 547 | &bus_attr_add.attr, |
| 548 | &bus_attr_remove.attr, |
| 549 | &bus_attr_add_single_major.attr, |
| 550 | &bus_attr_remove_single_major.attr, |
| 551 | &bus_attr_supported_features.attr, |
| 552 | NULL, |
| 553 | }; |
| 554 | |
| 555 | static umode_t rbd_bus_is_visible(struct kobject *kobj, |
| 556 | struct attribute *attr, int index) |
| 557 | { |
| 558 | if (!single_major && |
| 559 | (attr == &bus_attr_add_single_major.attr || |
| 560 | attr == &bus_attr_remove_single_major.attr)) |
| 561 | return 0; |
| 562 | |
| 563 | return attr->mode; |
| 564 | } |
| 565 | |
| 566 | static const struct attribute_group rbd_bus_group = { |
| 567 | .attrs = rbd_bus_attrs, |
| 568 | .is_visible = rbd_bus_is_visible, |
| 569 | }; |
| 570 | __ATTRIBUTE_GROUPS(rbd_bus); |
| 571 | |
| 572 | static struct bus_type rbd_bus_type = { |
| 573 | .name = "rbd", |
| 574 | .bus_groups = rbd_bus_groups, |
| 575 | }; |
| 576 | |
| 577 | static void rbd_root_dev_release(struct device *dev) |
| 578 | { |
| 579 | } |
| 580 | |
| 581 | static struct device rbd_root_dev = { |
| 582 | .init_name = "rbd", |
| 583 | .release = rbd_root_dev_release, |
| 584 | }; |
| 585 | |
| 586 | static __printf(2, 3) |
| 587 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) |
| 588 | { |
| 589 | struct va_format vaf; |
| 590 | va_list args; |
| 591 | |
| 592 | va_start(args, fmt); |
| 593 | vaf.fmt = fmt; |
| 594 | vaf.va = &args; |
| 595 | |
| 596 | if (!rbd_dev) |
| 597 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); |
| 598 | else if (rbd_dev->disk) |
| 599 | printk(KERN_WARNING "%s: %s: %pV\n", |
| 600 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); |
| 601 | else if (rbd_dev->spec && rbd_dev->spec->image_name) |
| 602 | printk(KERN_WARNING "%s: image %s: %pV\n", |
| 603 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); |
| 604 | else if (rbd_dev->spec && rbd_dev->spec->image_id) |
| 605 | printk(KERN_WARNING "%s: id %s: %pV\n", |
| 606 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); |
| 607 | else /* punt */ |
| 608 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", |
| 609 | RBD_DRV_NAME, rbd_dev, &vaf); |
| 610 | va_end(args); |
| 611 | } |
| 612 | |
| 613 | #ifdef RBD_DEBUG |
| 614 | #define rbd_assert(expr) \ |
| 615 | if (unlikely(!(expr))) { \ |
| 616 | printk(KERN_ERR "\nAssertion failure in %s() " \ |
| 617 | "at line %d:\n\n" \ |
| 618 | "\trbd_assert(%s);\n\n", \ |
| 619 | __func__, __LINE__, #expr); \ |
| 620 | BUG(); \ |
| 621 | } |
| 622 | #else /* !RBD_DEBUG */ |
| 623 | # define rbd_assert(expr) ((void) 0) |
| 624 | #endif /* !RBD_DEBUG */ |
| 625 | |
| 626 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
| 627 | |
| 628 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
| 629 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
| 630 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
| 631 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
| 632 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| 633 | u64 snap_id); |
| 634 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 635 | u8 *order, u64 *snap_size); |
| 636 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 637 | u64 *snap_features); |
| 638 | static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev); |
| 639 | |
| 640 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result); |
| 641 | static void rbd_img_handle_request(struct rbd_img_request *img_req, int result); |
| 642 | |
| 643 | /* |
| 644 | * Return true if nothing else is pending. |
| 645 | */ |
| 646 | static bool pending_result_dec(struct pending_result *pending, int *result) |
| 647 | { |
| 648 | rbd_assert(pending->num_pending > 0); |
| 649 | |
| 650 | if (*result && !pending->result) |
| 651 | pending->result = *result; |
| 652 | if (--pending->num_pending) |
| 653 | return false; |
| 654 | |
| 655 | *result = pending->result; |
| 656 | return true; |
| 657 | } |
| 658 | |
| 659 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
| 660 | { |
| 661 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
| 662 | bool removing = false; |
| 663 | |
| 664 | spin_lock_irq(&rbd_dev->lock); |
| 665 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
| 666 | removing = true; |
| 667 | else |
| 668 | rbd_dev->open_count++; |
| 669 | spin_unlock_irq(&rbd_dev->lock); |
| 670 | if (removing) |
| 671 | return -ENOENT; |
| 672 | |
| 673 | (void) get_device(&rbd_dev->dev); |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
| 679 | { |
| 680 | struct rbd_device *rbd_dev = disk->private_data; |
| 681 | unsigned long open_count_before; |
| 682 | |
| 683 | spin_lock_irq(&rbd_dev->lock); |
| 684 | open_count_before = rbd_dev->open_count--; |
| 685 | spin_unlock_irq(&rbd_dev->lock); |
| 686 | rbd_assert(open_count_before > 0); |
| 687 | |
| 688 | put_device(&rbd_dev->dev); |
| 689 | } |
| 690 | |
| 691 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
| 692 | { |
| 693 | int ro; |
| 694 | |
| 695 | if (get_user(ro, (int __user *)arg)) |
| 696 | return -EFAULT; |
| 697 | |
| 698 | /* Snapshots can't be marked read-write */ |
| 699 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
| 700 | return -EROFS; |
| 701 | |
| 702 | /* Let blkdev_roset() handle it */ |
| 703 | return -ENOTTY; |
| 704 | } |
| 705 | |
| 706 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, |
| 707 | unsigned int cmd, unsigned long arg) |
| 708 | { |
| 709 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
| 710 | int ret; |
| 711 | |
| 712 | switch (cmd) { |
| 713 | case BLKROSET: |
| 714 | ret = rbd_ioctl_set_ro(rbd_dev, arg); |
| 715 | break; |
| 716 | default: |
| 717 | ret = -ENOTTY; |
| 718 | } |
| 719 | |
| 720 | return ret; |
| 721 | } |
| 722 | |
| 723 | #ifdef CONFIG_COMPAT |
| 724 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| 725 | unsigned int cmd, unsigned long arg) |
| 726 | { |
| 727 | return rbd_ioctl(bdev, mode, cmd, arg); |
| 728 | } |
| 729 | #endif /* CONFIG_COMPAT */ |
| 730 | |
| 731 | static const struct block_device_operations rbd_bd_ops = { |
| 732 | .owner = THIS_MODULE, |
| 733 | .open = rbd_open, |
| 734 | .release = rbd_release, |
| 735 | .ioctl = rbd_ioctl, |
| 736 | #ifdef CONFIG_COMPAT |
| 737 | .compat_ioctl = rbd_compat_ioctl, |
| 738 | #endif |
| 739 | }; |
| 740 | |
| 741 | /* |
| 742 | * Initialize an rbd client instance. Success or not, this function |
| 743 | * consumes ceph_opts. Caller holds client_mutex. |
| 744 | */ |
| 745 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
| 746 | { |
| 747 | struct rbd_client *rbdc; |
| 748 | int ret = -ENOMEM; |
| 749 | |
| 750 | dout("%s:\n", __func__); |
| 751 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| 752 | if (!rbdc) |
| 753 | goto out_opt; |
| 754 | |
| 755 | kref_init(&rbdc->kref); |
| 756 | INIT_LIST_HEAD(&rbdc->node); |
| 757 | |
| 758 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
| 759 | if (IS_ERR(rbdc->client)) |
| 760 | goto out_rbdc; |
| 761 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
| 762 | |
| 763 | ret = ceph_open_session(rbdc->client); |
| 764 | if (ret < 0) |
| 765 | goto out_client; |
| 766 | |
| 767 | spin_lock(&rbd_client_list_lock); |
| 768 | list_add_tail(&rbdc->node, &rbd_client_list); |
| 769 | spin_unlock(&rbd_client_list_lock); |
| 770 | |
| 771 | dout("%s: rbdc %p\n", __func__, rbdc); |
| 772 | |
| 773 | return rbdc; |
| 774 | out_client: |
| 775 | ceph_destroy_client(rbdc->client); |
| 776 | out_rbdc: |
| 777 | kfree(rbdc); |
| 778 | out_opt: |
| 779 | if (ceph_opts) |
| 780 | ceph_destroy_options(ceph_opts); |
| 781 | dout("%s: error %d\n", __func__, ret); |
| 782 | |
| 783 | return ERR_PTR(ret); |
| 784 | } |
| 785 | |
| 786 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
| 787 | { |
| 788 | kref_get(&rbdc->kref); |
| 789 | |
| 790 | return rbdc; |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * Find a ceph client with specific addr and configuration. If |
| 795 | * found, bump its reference count. |
| 796 | */ |
| 797 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
| 798 | { |
| 799 | struct rbd_client *client_node; |
| 800 | bool found = false; |
| 801 | |
| 802 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
| 803 | return NULL; |
| 804 | |
| 805 | spin_lock(&rbd_client_list_lock); |
| 806 | list_for_each_entry(client_node, &rbd_client_list, node) { |
| 807 | if (!ceph_compare_options(ceph_opts, client_node->client)) { |
| 808 | __rbd_get_client(client_node); |
| 809 | |
| 810 | found = true; |
| 811 | break; |
| 812 | } |
| 813 | } |
| 814 | spin_unlock(&rbd_client_list_lock); |
| 815 | |
| 816 | return found ? client_node : NULL; |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * (Per device) rbd map options |
| 821 | */ |
| 822 | enum { |
| 823 | Opt_queue_depth, |
| 824 | Opt_alloc_size, |
| 825 | Opt_lock_timeout, |
| 826 | Opt_last_int, |
| 827 | /* int args above */ |
| 828 | Opt_pool_ns, |
| 829 | Opt_last_string, |
| 830 | /* string args above */ |
| 831 | Opt_read_only, |
| 832 | Opt_read_write, |
| 833 | Opt_lock_on_read, |
| 834 | Opt_exclusive, |
| 835 | Opt_notrim, |
| 836 | Opt_err |
| 837 | }; |
| 838 | |
| 839 | static match_table_t rbd_opts_tokens = { |
| 840 | {Opt_queue_depth, "queue_depth=%d"}, |
| 841 | {Opt_alloc_size, "alloc_size=%d"}, |
| 842 | {Opt_lock_timeout, "lock_timeout=%d"}, |
| 843 | /* int args above */ |
| 844 | {Opt_pool_ns, "_pool_ns=%s"}, |
| 845 | /* string args above */ |
| 846 | {Opt_read_only, "read_only"}, |
| 847 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
| 848 | {Opt_read_write, "read_write"}, |
| 849 | {Opt_read_write, "rw"}, /* Alternate spelling */ |
| 850 | {Opt_lock_on_read, "lock_on_read"}, |
| 851 | {Opt_exclusive, "exclusive"}, |
| 852 | {Opt_notrim, "notrim"}, |
| 853 | {Opt_err, NULL} |
| 854 | }; |
| 855 | |
| 856 | struct rbd_options { |
| 857 | int queue_depth; |
| 858 | int alloc_size; |
| 859 | unsigned long lock_timeout; |
| 860 | bool read_only; |
| 861 | bool lock_on_read; |
| 862 | bool exclusive; |
| 863 | bool trim; |
| 864 | }; |
| 865 | |
| 866 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
| 867 | #define RBD_ALLOC_SIZE_DEFAULT (64 * 1024) |
| 868 | #define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
| 869 | #define RBD_READ_ONLY_DEFAULT false |
| 870 | #define RBD_LOCK_ON_READ_DEFAULT false |
| 871 | #define RBD_EXCLUSIVE_DEFAULT false |
| 872 | #define RBD_TRIM_DEFAULT true |
| 873 | |
| 874 | struct parse_rbd_opts_ctx { |
| 875 | struct rbd_spec *spec; |
| 876 | struct rbd_options *opts; |
| 877 | }; |
| 878 | |
| 879 | static int parse_rbd_opts_token(char *c, void *private) |
| 880 | { |
| 881 | struct parse_rbd_opts_ctx *pctx = private; |
| 882 | substring_t argstr[MAX_OPT_ARGS]; |
| 883 | int token, intval, ret; |
| 884 | |
| 885 | token = match_token(c, rbd_opts_tokens, argstr); |
| 886 | if (token < Opt_last_int) { |
| 887 | ret = match_int(&argstr[0], &intval); |
| 888 | if (ret < 0) { |
| 889 | pr_err("bad option arg (not int) at '%s'\n", c); |
| 890 | return ret; |
| 891 | } |
| 892 | dout("got int token %d val %d\n", token, intval); |
| 893 | } else if (token > Opt_last_int && token < Opt_last_string) { |
| 894 | dout("got string token %d val %s\n", token, argstr[0].from); |
| 895 | } else { |
| 896 | dout("got token %d\n", token); |
| 897 | } |
| 898 | |
| 899 | switch (token) { |
| 900 | case Opt_queue_depth: |
| 901 | if (intval < 1) { |
| 902 | pr_err("queue_depth out of range\n"); |
| 903 | return -EINVAL; |
| 904 | } |
| 905 | pctx->opts->queue_depth = intval; |
| 906 | break; |
| 907 | case Opt_alloc_size: |
| 908 | if (intval < SECTOR_SIZE) { |
| 909 | pr_err("alloc_size out of range\n"); |
| 910 | return -EINVAL; |
| 911 | } |
| 912 | if (!is_power_of_2(intval)) { |
| 913 | pr_err("alloc_size must be a power of 2\n"); |
| 914 | return -EINVAL; |
| 915 | } |
| 916 | pctx->opts->alloc_size = intval; |
| 917 | break; |
| 918 | case Opt_lock_timeout: |
| 919 | /* 0 is "wait forever" (i.e. infinite timeout) */ |
| 920 | if (intval < 0 || intval > INT_MAX / 1000) { |
| 921 | pr_err("lock_timeout out of range\n"); |
| 922 | return -EINVAL; |
| 923 | } |
| 924 | pctx->opts->lock_timeout = msecs_to_jiffies(intval * 1000); |
| 925 | break; |
| 926 | case Opt_pool_ns: |
| 927 | kfree(pctx->spec->pool_ns); |
| 928 | pctx->spec->pool_ns = match_strdup(argstr); |
| 929 | if (!pctx->spec->pool_ns) |
| 930 | return -ENOMEM; |
| 931 | break; |
| 932 | case Opt_read_only: |
| 933 | pctx->opts->read_only = true; |
| 934 | break; |
| 935 | case Opt_read_write: |
| 936 | pctx->opts->read_only = false; |
| 937 | break; |
| 938 | case Opt_lock_on_read: |
| 939 | pctx->opts->lock_on_read = true; |
| 940 | break; |
| 941 | case Opt_exclusive: |
| 942 | pctx->opts->exclusive = true; |
| 943 | break; |
| 944 | case Opt_notrim: |
| 945 | pctx->opts->trim = false; |
| 946 | break; |
| 947 | default: |
| 948 | /* libceph prints "bad option" msg */ |
| 949 | return -EINVAL; |
| 950 | } |
| 951 | |
| 952 | return 0; |
| 953 | } |
| 954 | |
| 955 | static char* obj_op_name(enum obj_operation_type op_type) |
| 956 | { |
| 957 | switch (op_type) { |
| 958 | case OBJ_OP_READ: |
| 959 | return "read"; |
| 960 | case OBJ_OP_WRITE: |
| 961 | return "write"; |
| 962 | case OBJ_OP_DISCARD: |
| 963 | return "discard"; |
| 964 | case OBJ_OP_ZEROOUT: |
| 965 | return "zeroout"; |
| 966 | default: |
| 967 | return "???"; |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * Destroy ceph client |
| 973 | * |
| 974 | * Caller must hold rbd_client_list_lock. |
| 975 | */ |
| 976 | static void rbd_client_release(struct kref *kref) |
| 977 | { |
| 978 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
| 979 | |
| 980 | dout("%s: rbdc %p\n", __func__, rbdc); |
| 981 | spin_lock(&rbd_client_list_lock); |
| 982 | list_del(&rbdc->node); |
| 983 | spin_unlock(&rbd_client_list_lock); |
| 984 | |
| 985 | ceph_destroy_client(rbdc->client); |
| 986 | kfree(rbdc); |
| 987 | } |
| 988 | |
| 989 | /* |
| 990 | * Drop reference to ceph client node. If it's not referenced anymore, release |
| 991 | * it. |
| 992 | */ |
| 993 | static void rbd_put_client(struct rbd_client *rbdc) |
| 994 | { |
| 995 | if (rbdc) |
| 996 | kref_put(&rbdc->kref, rbd_client_release); |
| 997 | } |
| 998 | |
| 999 | /* |
| 1000 | * Get a ceph client with specific addr and configuration, if one does |
| 1001 | * not exist create it. Either way, ceph_opts is consumed by this |
| 1002 | * function. |
| 1003 | */ |
| 1004 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
| 1005 | { |
| 1006 | struct rbd_client *rbdc; |
| 1007 | int ret; |
| 1008 | |
| 1009 | mutex_lock(&client_mutex); |
| 1010 | rbdc = rbd_client_find(ceph_opts); |
| 1011 | if (rbdc) { |
| 1012 | ceph_destroy_options(ceph_opts); |
| 1013 | |
| 1014 | /* |
| 1015 | * Using an existing client. Make sure ->pg_pools is up to |
| 1016 | * date before we look up the pool id in do_rbd_add(). |
| 1017 | */ |
| 1018 | ret = ceph_wait_for_latest_osdmap(rbdc->client, |
| 1019 | rbdc->client->options->mount_timeout); |
| 1020 | if (ret) { |
| 1021 | rbd_warn(NULL, "failed to get latest osdmap: %d", ret); |
| 1022 | rbd_put_client(rbdc); |
| 1023 | rbdc = ERR_PTR(ret); |
| 1024 | } |
| 1025 | } else { |
| 1026 | rbdc = rbd_client_create(ceph_opts); |
| 1027 | } |
| 1028 | mutex_unlock(&client_mutex); |
| 1029 | |
| 1030 | return rbdc; |
| 1031 | } |
| 1032 | |
| 1033 | static bool rbd_image_format_valid(u32 image_format) |
| 1034 | { |
| 1035 | return image_format == 1 || image_format == 2; |
| 1036 | } |
| 1037 | |
| 1038 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
| 1039 | { |
| 1040 | size_t size; |
| 1041 | u32 snap_count; |
| 1042 | |
| 1043 | /* The header has to start with the magic rbd header text */ |
| 1044 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) |
| 1045 | return false; |
| 1046 | |
| 1047 | /* The bio layer requires at least sector-sized I/O */ |
| 1048 | |
| 1049 | if (ondisk->options.order < SECTOR_SHIFT) |
| 1050 | return false; |
| 1051 | |
| 1052 | /* If we use u64 in a few spots we may be able to loosen this */ |
| 1053 | |
| 1054 | if (ondisk->options.order > 8 * sizeof (int) - 1) |
| 1055 | return false; |
| 1056 | |
| 1057 | /* |
| 1058 | * The size of a snapshot header has to fit in a size_t, and |
| 1059 | * that limits the number of snapshots. |
| 1060 | */ |
| 1061 | snap_count = le32_to_cpu(ondisk->snap_count); |
| 1062 | size = SIZE_MAX - sizeof (struct ceph_snap_context); |
| 1063 | if (snap_count > size / sizeof (__le64)) |
| 1064 | return false; |
| 1065 | |
| 1066 | /* |
| 1067 | * Not only that, but the size of the entire the snapshot |
| 1068 | * header must also be representable in a size_t. |
| 1069 | */ |
| 1070 | size -= snap_count * sizeof (__le64); |
| 1071 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) |
| 1072 | return false; |
| 1073 | |
| 1074 | return true; |
| 1075 | } |
| 1076 | |
| 1077 | /* |
| 1078 | * returns the size of an object in the image |
| 1079 | */ |
| 1080 | static u32 rbd_obj_bytes(struct rbd_image_header *header) |
| 1081 | { |
| 1082 | return 1U << header->obj_order; |
| 1083 | } |
| 1084 | |
| 1085 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
| 1086 | { |
| 1087 | if (rbd_dev->header.stripe_unit == 0 || |
| 1088 | rbd_dev->header.stripe_count == 0) { |
| 1089 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); |
| 1090 | rbd_dev->header.stripe_count = 1; |
| 1091 | } |
| 1092 | |
| 1093 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; |
| 1094 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; |
| 1095 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); |
| 1096 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
| 1097 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; |
| 1098 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * Fill an rbd image header with information from the given format 1 |
| 1103 | * on-disk header. |
| 1104 | */ |
| 1105 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
| 1106 | struct rbd_image_header_ondisk *ondisk) |
| 1107 | { |
| 1108 | struct rbd_image_header *header = &rbd_dev->header; |
| 1109 | bool first_time = header->object_prefix == NULL; |
| 1110 | struct ceph_snap_context *snapc; |
| 1111 | char *object_prefix = NULL; |
| 1112 | char *snap_names = NULL; |
| 1113 | u64 *snap_sizes = NULL; |
| 1114 | u32 snap_count; |
| 1115 | int ret = -ENOMEM; |
| 1116 | u32 i; |
| 1117 | |
| 1118 | /* Allocate this now to avoid having to handle failure below */ |
| 1119 | |
| 1120 | if (first_time) { |
| 1121 | object_prefix = kstrndup(ondisk->object_prefix, |
| 1122 | sizeof(ondisk->object_prefix), |
| 1123 | GFP_KERNEL); |
| 1124 | if (!object_prefix) |
| 1125 | return -ENOMEM; |
| 1126 | } |
| 1127 | |
| 1128 | /* Allocate the snapshot context and fill it in */ |
| 1129 | |
| 1130 | snap_count = le32_to_cpu(ondisk->snap_count); |
| 1131 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
| 1132 | if (!snapc) |
| 1133 | goto out_err; |
| 1134 | snapc->seq = le64_to_cpu(ondisk->snap_seq); |
| 1135 | if (snap_count) { |
| 1136 | struct rbd_image_snap_ondisk *snaps; |
| 1137 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
| 1138 | |
| 1139 | /* We'll keep a copy of the snapshot names... */ |
| 1140 | |
| 1141 | if (snap_names_len > (u64)SIZE_MAX) |
| 1142 | goto out_2big; |
| 1143 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
| 1144 | if (!snap_names) |
| 1145 | goto out_err; |
| 1146 | |
| 1147 | /* ...as well as the array of their sizes. */ |
| 1148 | snap_sizes = kmalloc_array(snap_count, |
| 1149 | sizeof(*header->snap_sizes), |
| 1150 | GFP_KERNEL); |
| 1151 | if (!snap_sizes) |
| 1152 | goto out_err; |
| 1153 | |
| 1154 | /* |
| 1155 | * Copy the names, and fill in each snapshot's id |
| 1156 | * and size. |
| 1157 | * |
| 1158 | * Note that rbd_dev_v1_header_info() guarantees the |
| 1159 | * ondisk buffer we're working with has |
| 1160 | * snap_names_len bytes beyond the end of the |
| 1161 | * snapshot id array, this memcpy() is safe. |
| 1162 | */ |
| 1163 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
| 1164 | snaps = ondisk->snaps; |
| 1165 | for (i = 0; i < snap_count; i++) { |
| 1166 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); |
| 1167 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | /* We won't fail any more, fill in the header */ |
| 1172 | |
| 1173 | if (first_time) { |
| 1174 | header->object_prefix = object_prefix; |
| 1175 | header->obj_order = ondisk->options.order; |
| 1176 | rbd_init_layout(rbd_dev); |
| 1177 | } else { |
| 1178 | ceph_put_snap_context(header->snapc); |
| 1179 | kfree(header->snap_names); |
| 1180 | kfree(header->snap_sizes); |
| 1181 | } |
| 1182 | |
| 1183 | /* The remaining fields always get updated (when we refresh) */ |
| 1184 | |
| 1185 | header->image_size = le64_to_cpu(ondisk->image_size); |
| 1186 | header->snapc = snapc; |
| 1187 | header->snap_names = snap_names; |
| 1188 | header->snap_sizes = snap_sizes; |
| 1189 | |
| 1190 | return 0; |
| 1191 | out_2big: |
| 1192 | ret = -EIO; |
| 1193 | out_err: |
| 1194 | kfree(snap_sizes); |
| 1195 | kfree(snap_names); |
| 1196 | ceph_put_snap_context(snapc); |
| 1197 | kfree(object_prefix); |
| 1198 | |
| 1199 | return ret; |
| 1200 | } |
| 1201 | |
| 1202 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
| 1203 | { |
| 1204 | const char *snap_name; |
| 1205 | |
| 1206 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
| 1207 | |
| 1208 | /* Skip over names until we find the one we are looking for */ |
| 1209 | |
| 1210 | snap_name = rbd_dev->header.snap_names; |
| 1211 | while (which--) |
| 1212 | snap_name += strlen(snap_name) + 1; |
| 1213 | |
| 1214 | return kstrdup(snap_name, GFP_KERNEL); |
| 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Snapshot id comparison function for use with qsort()/bsearch(). |
| 1219 | * Note that result is for snapshots in *descending* order. |
| 1220 | */ |
| 1221 | static int snapid_compare_reverse(const void *s1, const void *s2) |
| 1222 | { |
| 1223 | u64 snap_id1 = *(u64 *)s1; |
| 1224 | u64 snap_id2 = *(u64 *)s2; |
| 1225 | |
| 1226 | if (snap_id1 < snap_id2) |
| 1227 | return 1; |
| 1228 | return snap_id1 == snap_id2 ? 0 : -1; |
| 1229 | } |
| 1230 | |
| 1231 | /* |
| 1232 | * Search a snapshot context to see if the given snapshot id is |
| 1233 | * present. |
| 1234 | * |
| 1235 | * Returns the position of the snapshot id in the array if it's found, |
| 1236 | * or BAD_SNAP_INDEX otherwise. |
| 1237 | * |
| 1238 | * Note: The snapshot array is in kept sorted (by the osd) in |
| 1239 | * reverse order, highest snapshot id first. |
| 1240 | */ |
| 1241 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
| 1242 | { |
| 1243 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| 1244 | u64 *found; |
| 1245 | |
| 1246 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
| 1247 | sizeof (snap_id), snapid_compare_reverse); |
| 1248 | |
| 1249 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
| 1250 | } |
| 1251 | |
| 1252 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
| 1253 | u64 snap_id) |
| 1254 | { |
| 1255 | u32 which; |
| 1256 | const char *snap_name; |
| 1257 | |
| 1258 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
| 1259 | if (which == BAD_SNAP_INDEX) |
| 1260 | return ERR_PTR(-ENOENT); |
| 1261 | |
| 1262 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
| 1263 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); |
| 1264 | } |
| 1265 | |
| 1266 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
| 1267 | { |
| 1268 | if (snap_id == CEPH_NOSNAP) |
| 1269 | return RBD_SNAP_HEAD_NAME; |
| 1270 | |
| 1271 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1272 | if (rbd_dev->image_format == 1) |
| 1273 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); |
| 1274 | |
| 1275 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
| 1276 | } |
| 1277 | |
| 1278 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 1279 | u64 *snap_size) |
| 1280 | { |
| 1281 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1282 | if (snap_id == CEPH_NOSNAP) { |
| 1283 | *snap_size = rbd_dev->header.image_size; |
| 1284 | } else if (rbd_dev->image_format == 1) { |
| 1285 | u32 which; |
| 1286 | |
| 1287 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
| 1288 | if (which == BAD_SNAP_INDEX) |
| 1289 | return -ENOENT; |
| 1290 | |
| 1291 | *snap_size = rbd_dev->header.snap_sizes[which]; |
| 1292 | } else { |
| 1293 | u64 size = 0; |
| 1294 | int ret; |
| 1295 | |
| 1296 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
| 1297 | if (ret) |
| 1298 | return ret; |
| 1299 | |
| 1300 | *snap_size = size; |
| 1301 | } |
| 1302 | return 0; |
| 1303 | } |
| 1304 | |
| 1305 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 1306 | u64 *snap_features) |
| 1307 | { |
| 1308 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 1309 | if (snap_id == CEPH_NOSNAP) { |
| 1310 | *snap_features = rbd_dev->header.features; |
| 1311 | } else if (rbd_dev->image_format == 1) { |
| 1312 | *snap_features = 0; /* No features for format 1 */ |
| 1313 | } else { |
| 1314 | u64 features = 0; |
| 1315 | int ret; |
| 1316 | |
| 1317 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
| 1318 | if (ret) |
| 1319 | return ret; |
| 1320 | |
| 1321 | *snap_features = features; |
| 1322 | } |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
| 1326 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
| 1327 | { |
| 1328 | u64 snap_id = rbd_dev->spec->snap_id; |
| 1329 | u64 size = 0; |
| 1330 | u64 features = 0; |
| 1331 | int ret; |
| 1332 | |
| 1333 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
| 1334 | if (ret) |
| 1335 | return ret; |
| 1336 | ret = rbd_snap_features(rbd_dev, snap_id, &features); |
| 1337 | if (ret) |
| 1338 | return ret; |
| 1339 | |
| 1340 | rbd_dev->mapping.size = size; |
| 1341 | rbd_dev->mapping.features = features; |
| 1342 | |
| 1343 | return 0; |
| 1344 | } |
| 1345 | |
| 1346 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
| 1347 | { |
| 1348 | rbd_dev->mapping.size = 0; |
| 1349 | rbd_dev->mapping.features = 0; |
| 1350 | } |
| 1351 | |
| 1352 | static void zero_bvec(struct bio_vec *bv) |
| 1353 | { |
| 1354 | void *buf; |
| 1355 | unsigned long flags; |
| 1356 | |
| 1357 | buf = bvec_kmap_irq(bv, &flags); |
| 1358 | memset(buf, 0, bv->bv_len); |
| 1359 | flush_dcache_page(bv->bv_page); |
| 1360 | bvec_kunmap_irq(buf, &flags); |
| 1361 | } |
| 1362 | |
| 1363 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
| 1364 | { |
| 1365 | struct ceph_bio_iter it = *bio_pos; |
| 1366 | |
| 1367 | ceph_bio_iter_advance(&it, off); |
| 1368 | ceph_bio_iter_advance_step(&it, bytes, ({ |
| 1369 | zero_bvec(&bv); |
| 1370 | })); |
| 1371 | } |
| 1372 | |
| 1373 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
| 1374 | { |
| 1375 | struct ceph_bvec_iter it = *bvec_pos; |
| 1376 | |
| 1377 | ceph_bvec_iter_advance(&it, off); |
| 1378 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
| 1379 | zero_bvec(&bv); |
| 1380 | })); |
| 1381 | } |
| 1382 | |
| 1383 | /* |
| 1384 | * Zero a range in @obj_req data buffer defined by a bio (list) or |
| 1385 | * (private) bio_vec array. |
| 1386 | * |
| 1387 | * @off is relative to the start of the data buffer. |
| 1388 | */ |
| 1389 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
| 1390 | u32 bytes) |
| 1391 | { |
| 1392 | dout("%s %p data buf %u~%u\n", __func__, obj_req, off, bytes); |
| 1393 | |
| 1394 | switch (obj_req->img_request->data_type) { |
| 1395 | case OBJ_REQUEST_BIO: |
| 1396 | zero_bios(&obj_req->bio_pos, off, bytes); |
| 1397 | break; |
| 1398 | case OBJ_REQUEST_BVECS: |
| 1399 | case OBJ_REQUEST_OWN_BVECS: |
| 1400 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
| 1401 | break; |
| 1402 | default: |
| 1403 | BUG(); |
| 1404 | } |
| 1405 | } |
| 1406 | |
| 1407 | static void rbd_obj_request_destroy(struct kref *kref); |
| 1408 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) |
| 1409 | { |
| 1410 | rbd_assert(obj_request != NULL); |
| 1411 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
| 1412 | kref_read(&obj_request->kref)); |
| 1413 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
| 1414 | } |
| 1415 | |
| 1416 | static void rbd_img_request_destroy(struct kref *kref); |
| 1417 | static void rbd_img_request_put(struct rbd_img_request *img_request) |
| 1418 | { |
| 1419 | rbd_assert(img_request != NULL); |
| 1420 | dout("%s: img %p (was %d)\n", __func__, img_request, |
| 1421 | kref_read(&img_request->kref)); |
| 1422 | kref_put(&img_request->kref, rbd_img_request_destroy); |
| 1423 | } |
| 1424 | |
| 1425 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
| 1426 | struct rbd_obj_request *obj_request) |
| 1427 | { |
| 1428 | rbd_assert(obj_request->img_request == NULL); |
| 1429 | |
| 1430 | /* Image request now owns object's original reference */ |
| 1431 | obj_request->img_request = img_request; |
| 1432 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
| 1433 | } |
| 1434 | |
| 1435 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, |
| 1436 | struct rbd_obj_request *obj_request) |
| 1437 | { |
| 1438 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
| 1439 | list_del(&obj_request->ex.oe_item); |
| 1440 | rbd_assert(obj_request->img_request == img_request); |
| 1441 | rbd_obj_request_put(obj_request); |
| 1442 | } |
| 1443 | |
| 1444 | static void rbd_osd_submit(struct ceph_osd_request *osd_req) |
| 1445 | { |
| 1446 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 1447 | |
| 1448 | dout("%s osd_req %p for obj_req %p objno %llu %llu~%llu\n", |
| 1449 | __func__, osd_req, obj_req, obj_req->ex.oe_objno, |
| 1450 | obj_req->ex.oe_off, obj_req->ex.oe_len); |
| 1451 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
| 1452 | } |
| 1453 | |
| 1454 | /* |
| 1455 | * The default/initial value for all image request flags is 0. Each |
| 1456 | * is conditionally set to 1 at image request initialization time |
| 1457 | * and currently never change thereafter. |
| 1458 | */ |
| 1459 | static void img_request_layered_set(struct rbd_img_request *img_request) |
| 1460 | { |
| 1461 | set_bit(IMG_REQ_LAYERED, &img_request->flags); |
| 1462 | smp_mb(); |
| 1463 | } |
| 1464 | |
| 1465 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
| 1466 | { |
| 1467 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); |
| 1468 | smp_mb(); |
| 1469 | } |
| 1470 | |
| 1471 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
| 1472 | { |
| 1473 | smp_mb(); |
| 1474 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; |
| 1475 | } |
| 1476 | |
| 1477 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
| 1478 | { |
| 1479 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 1480 | |
| 1481 | return !obj_req->ex.oe_off && |
| 1482 | obj_req->ex.oe_len == rbd_dev->layout.object_size; |
| 1483 | } |
| 1484 | |
| 1485 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
| 1486 | { |
| 1487 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 1488 | |
| 1489 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
| 1490 | rbd_dev->layout.object_size; |
| 1491 | } |
| 1492 | |
| 1493 | /* |
| 1494 | * Must be called after rbd_obj_calc_img_extents(). |
| 1495 | */ |
| 1496 | static bool rbd_obj_copyup_enabled(struct rbd_obj_request *obj_req) |
| 1497 | { |
| 1498 | if (!obj_req->num_img_extents || |
| 1499 | (rbd_obj_is_entire(obj_req) && |
| 1500 | !obj_req->img_request->snapc->num_snaps)) |
| 1501 | return false; |
| 1502 | |
| 1503 | return true; |
| 1504 | } |
| 1505 | |
| 1506 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
| 1507 | { |
| 1508 | return ceph_file_extents_bytes(obj_req->img_extents, |
| 1509 | obj_req->num_img_extents); |
| 1510 | } |
| 1511 | |
| 1512 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
| 1513 | { |
| 1514 | switch (img_req->op_type) { |
| 1515 | case OBJ_OP_READ: |
| 1516 | return false; |
| 1517 | case OBJ_OP_WRITE: |
| 1518 | case OBJ_OP_DISCARD: |
| 1519 | case OBJ_OP_ZEROOUT: |
| 1520 | return true; |
| 1521 | default: |
| 1522 | BUG(); |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
| 1527 | { |
| 1528 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 1529 | int result; |
| 1530 | |
| 1531 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
| 1532 | osd_req->r_result, obj_req); |
| 1533 | |
| 1534 | /* |
| 1535 | * Writes aren't allowed to return a data payload. In some |
| 1536 | * guarded write cases (e.g. stat + zero on an empty object) |
| 1537 | * a stat response makes it through, but we don't care. |
| 1538 | */ |
| 1539 | if (osd_req->r_result > 0 && rbd_img_is_write(obj_req->img_request)) |
| 1540 | result = 0; |
| 1541 | else |
| 1542 | result = osd_req->r_result; |
| 1543 | |
| 1544 | rbd_obj_handle_request(obj_req, result); |
| 1545 | } |
| 1546 | |
| 1547 | static void rbd_osd_format_read(struct ceph_osd_request *osd_req) |
| 1548 | { |
| 1549 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
| 1550 | |
| 1551 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
| 1552 | osd_req->r_snapid = obj_request->img_request->snap_id; |
| 1553 | } |
| 1554 | |
| 1555 | static void rbd_osd_format_write(struct ceph_osd_request *osd_req) |
| 1556 | { |
| 1557 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
| 1558 | |
| 1559 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
| 1560 | ktime_get_real_ts64(&osd_req->r_mtime); |
| 1561 | osd_req->r_data_offset = obj_request->ex.oe_off; |
| 1562 | } |
| 1563 | |
| 1564 | static struct ceph_osd_request * |
| 1565 | __rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, |
| 1566 | struct ceph_snap_context *snapc, int num_ops) |
| 1567 | { |
| 1568 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 1569 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 1570 | struct ceph_osd_request *req; |
| 1571 | const char *name_format = rbd_dev->image_format == 1 ? |
| 1572 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; |
| 1573 | int ret; |
| 1574 | |
| 1575 | req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO); |
| 1576 | if (!req) |
| 1577 | return ERR_PTR(-ENOMEM); |
| 1578 | |
| 1579 | list_add_tail(&req->r_private_item, &obj_req->osd_reqs); |
| 1580 | req->r_callback = rbd_osd_req_callback; |
| 1581 | req->r_priv = obj_req; |
| 1582 | |
| 1583 | /* |
| 1584 | * Data objects may be stored in a separate pool, but always in |
| 1585 | * the same namespace in that pool as the header in its pool. |
| 1586 | */ |
| 1587 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); |
| 1588 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
| 1589 | |
| 1590 | ret = ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
| 1591 | rbd_dev->header.object_prefix, |
| 1592 | obj_req->ex.oe_objno); |
| 1593 | if (ret) |
| 1594 | return ERR_PTR(ret); |
| 1595 | |
| 1596 | return req; |
| 1597 | } |
| 1598 | |
| 1599 | static struct ceph_osd_request * |
| 1600 | rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, int num_ops) |
| 1601 | { |
| 1602 | return __rbd_obj_add_osd_request(obj_req, obj_req->img_request->snapc, |
| 1603 | num_ops); |
| 1604 | } |
| 1605 | |
| 1606 | static struct rbd_obj_request *rbd_obj_request_create(void) |
| 1607 | { |
| 1608 | struct rbd_obj_request *obj_request; |
| 1609 | |
| 1610 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
| 1611 | if (!obj_request) |
| 1612 | return NULL; |
| 1613 | |
| 1614 | ceph_object_extent_init(&obj_request->ex); |
| 1615 | INIT_LIST_HEAD(&obj_request->osd_reqs); |
| 1616 | mutex_init(&obj_request->state_mutex); |
| 1617 | kref_init(&obj_request->kref); |
| 1618 | |
| 1619 | dout("%s %p\n", __func__, obj_request); |
| 1620 | return obj_request; |
| 1621 | } |
| 1622 | |
| 1623 | static void rbd_obj_request_destroy(struct kref *kref) |
| 1624 | { |
| 1625 | struct rbd_obj_request *obj_request; |
| 1626 | struct ceph_osd_request *osd_req; |
| 1627 | u32 i; |
| 1628 | |
| 1629 | obj_request = container_of(kref, struct rbd_obj_request, kref); |
| 1630 | |
| 1631 | dout("%s: obj %p\n", __func__, obj_request); |
| 1632 | |
| 1633 | while (!list_empty(&obj_request->osd_reqs)) { |
| 1634 | osd_req = list_first_entry(&obj_request->osd_reqs, |
| 1635 | struct ceph_osd_request, r_private_item); |
| 1636 | list_del_init(&osd_req->r_private_item); |
| 1637 | ceph_osdc_put_request(osd_req); |
| 1638 | } |
| 1639 | |
| 1640 | switch (obj_request->img_request->data_type) { |
| 1641 | case OBJ_REQUEST_NODATA: |
| 1642 | case OBJ_REQUEST_BIO: |
| 1643 | case OBJ_REQUEST_BVECS: |
| 1644 | break; /* Nothing to do */ |
| 1645 | case OBJ_REQUEST_OWN_BVECS: |
| 1646 | kfree(obj_request->bvec_pos.bvecs); |
| 1647 | break; |
| 1648 | default: |
| 1649 | BUG(); |
| 1650 | } |
| 1651 | |
| 1652 | kfree(obj_request->img_extents); |
| 1653 | if (obj_request->copyup_bvecs) { |
| 1654 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { |
| 1655 | if (obj_request->copyup_bvecs[i].bv_page) |
| 1656 | __free_page(obj_request->copyup_bvecs[i].bv_page); |
| 1657 | } |
| 1658 | kfree(obj_request->copyup_bvecs); |
| 1659 | } |
| 1660 | |
| 1661 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
| 1662 | } |
| 1663 | |
| 1664 | /* It's OK to call this for a device with no parent */ |
| 1665 | |
| 1666 | static void rbd_spec_put(struct rbd_spec *spec); |
| 1667 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) |
| 1668 | { |
| 1669 | rbd_dev_remove_parent(rbd_dev); |
| 1670 | rbd_spec_put(rbd_dev->parent_spec); |
| 1671 | rbd_dev->parent_spec = NULL; |
| 1672 | rbd_dev->parent_overlap = 0; |
| 1673 | } |
| 1674 | |
| 1675 | /* |
| 1676 | * Parent image reference counting is used to determine when an |
| 1677 | * image's parent fields can be safely torn down--after there are no |
| 1678 | * more in-flight requests to the parent image. When the last |
| 1679 | * reference is dropped, cleaning them up is safe. |
| 1680 | */ |
| 1681 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) |
| 1682 | { |
| 1683 | int counter; |
| 1684 | |
| 1685 | if (!rbd_dev->parent_spec) |
| 1686 | return; |
| 1687 | |
| 1688 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); |
| 1689 | if (counter > 0) |
| 1690 | return; |
| 1691 | |
| 1692 | /* Last reference; clean up parent data structures */ |
| 1693 | |
| 1694 | if (!counter) |
| 1695 | rbd_dev_unparent(rbd_dev); |
| 1696 | else |
| 1697 | rbd_warn(rbd_dev, "parent reference underflow"); |
| 1698 | } |
| 1699 | |
| 1700 | /* |
| 1701 | * If an image has a non-zero parent overlap, get a reference to its |
| 1702 | * parent. |
| 1703 | * |
| 1704 | * Returns true if the rbd device has a parent with a non-zero |
| 1705 | * overlap and a reference for it was successfully taken, or |
| 1706 | * false otherwise. |
| 1707 | */ |
| 1708 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) |
| 1709 | { |
| 1710 | int counter = 0; |
| 1711 | |
| 1712 | if (!rbd_dev->parent_spec) |
| 1713 | return false; |
| 1714 | |
| 1715 | down_read(&rbd_dev->header_rwsem); |
| 1716 | if (rbd_dev->parent_overlap) |
| 1717 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); |
| 1718 | up_read(&rbd_dev->header_rwsem); |
| 1719 | |
| 1720 | if (counter < 0) |
| 1721 | rbd_warn(rbd_dev, "parent reference overflow"); |
| 1722 | |
| 1723 | return counter > 0; |
| 1724 | } |
| 1725 | |
| 1726 | /* |
| 1727 | * Caller is responsible for filling in the list of object requests |
| 1728 | * that comprises the image request, and the Linux request pointer |
| 1729 | * (if there is one). |
| 1730 | */ |
| 1731 | static struct rbd_img_request *rbd_img_request_create( |
| 1732 | struct rbd_device *rbd_dev, |
| 1733 | enum obj_operation_type op_type, |
| 1734 | struct ceph_snap_context *snapc) |
| 1735 | { |
| 1736 | struct rbd_img_request *img_request; |
| 1737 | |
| 1738 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
| 1739 | if (!img_request) |
| 1740 | return NULL; |
| 1741 | |
| 1742 | img_request->rbd_dev = rbd_dev; |
| 1743 | img_request->op_type = op_type; |
| 1744 | if (!rbd_img_is_write(img_request)) |
| 1745 | img_request->snap_id = rbd_dev->spec->snap_id; |
| 1746 | else |
| 1747 | img_request->snapc = snapc; |
| 1748 | |
| 1749 | if (rbd_dev_parent_get(rbd_dev)) |
| 1750 | img_request_layered_set(img_request); |
| 1751 | |
| 1752 | INIT_LIST_HEAD(&img_request->lock_item); |
| 1753 | INIT_LIST_HEAD(&img_request->object_extents); |
| 1754 | mutex_init(&img_request->state_mutex); |
| 1755 | kref_init(&img_request->kref); |
| 1756 | |
| 1757 | return img_request; |
| 1758 | } |
| 1759 | |
| 1760 | static void rbd_img_request_destroy(struct kref *kref) |
| 1761 | { |
| 1762 | struct rbd_img_request *img_request; |
| 1763 | struct rbd_obj_request *obj_request; |
| 1764 | struct rbd_obj_request *next_obj_request; |
| 1765 | |
| 1766 | img_request = container_of(kref, struct rbd_img_request, kref); |
| 1767 | |
| 1768 | dout("%s: img %p\n", __func__, img_request); |
| 1769 | |
| 1770 | WARN_ON(!list_empty(&img_request->lock_item)); |
| 1771 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
| 1772 | rbd_img_obj_request_del(img_request, obj_request); |
| 1773 | |
| 1774 | if (img_request_layered_test(img_request)) { |
| 1775 | img_request_layered_clear(img_request); |
| 1776 | rbd_dev_parent_put(img_request->rbd_dev); |
| 1777 | } |
| 1778 | |
| 1779 | if (rbd_img_is_write(img_request)) |
| 1780 | ceph_put_snap_context(img_request->snapc); |
| 1781 | |
| 1782 | kmem_cache_free(rbd_img_request_cache, img_request); |
| 1783 | } |
| 1784 | |
| 1785 | #define BITS_PER_OBJ 2 |
| 1786 | #define OBJS_PER_BYTE (BITS_PER_BYTE / BITS_PER_OBJ) |
| 1787 | #define OBJ_MASK ((1 << BITS_PER_OBJ) - 1) |
| 1788 | |
| 1789 | static void __rbd_object_map_index(struct rbd_device *rbd_dev, u64 objno, |
| 1790 | u64 *index, u8 *shift) |
| 1791 | { |
| 1792 | u32 off; |
| 1793 | |
| 1794 | rbd_assert(objno < rbd_dev->object_map_size); |
| 1795 | *index = div_u64_rem(objno, OBJS_PER_BYTE, &off); |
| 1796 | *shift = (OBJS_PER_BYTE - off - 1) * BITS_PER_OBJ; |
| 1797 | } |
| 1798 | |
| 1799 | static u8 __rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
| 1800 | { |
| 1801 | u64 index; |
| 1802 | u8 shift; |
| 1803 | |
| 1804 | lockdep_assert_held(&rbd_dev->object_map_lock); |
| 1805 | __rbd_object_map_index(rbd_dev, objno, &index, &shift); |
| 1806 | return (rbd_dev->object_map[index] >> shift) & OBJ_MASK; |
| 1807 | } |
| 1808 | |
| 1809 | static void __rbd_object_map_set(struct rbd_device *rbd_dev, u64 objno, u8 val) |
| 1810 | { |
| 1811 | u64 index; |
| 1812 | u8 shift; |
| 1813 | u8 *p; |
| 1814 | |
| 1815 | lockdep_assert_held(&rbd_dev->object_map_lock); |
| 1816 | rbd_assert(!(val & ~OBJ_MASK)); |
| 1817 | |
| 1818 | __rbd_object_map_index(rbd_dev, objno, &index, &shift); |
| 1819 | p = &rbd_dev->object_map[index]; |
| 1820 | *p = (*p & ~(OBJ_MASK << shift)) | (val << shift); |
| 1821 | } |
| 1822 | |
| 1823 | static u8 rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
| 1824 | { |
| 1825 | u8 state; |
| 1826 | |
| 1827 | spin_lock(&rbd_dev->object_map_lock); |
| 1828 | state = __rbd_object_map_get(rbd_dev, objno); |
| 1829 | spin_unlock(&rbd_dev->object_map_lock); |
| 1830 | return state; |
| 1831 | } |
| 1832 | |
| 1833 | static bool use_object_map(struct rbd_device *rbd_dev) |
| 1834 | { |
| 1835 | return ((rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) && |
| 1836 | !(rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID)); |
| 1837 | } |
| 1838 | |
| 1839 | static bool rbd_object_map_may_exist(struct rbd_device *rbd_dev, u64 objno) |
| 1840 | { |
| 1841 | u8 state; |
| 1842 | |
| 1843 | /* fall back to default logic if object map is disabled or invalid */ |
| 1844 | if (!use_object_map(rbd_dev)) |
| 1845 | return true; |
| 1846 | |
| 1847 | state = rbd_object_map_get(rbd_dev, objno); |
| 1848 | return state != OBJECT_NONEXISTENT; |
| 1849 | } |
| 1850 | |
| 1851 | static void rbd_object_map_name(struct rbd_device *rbd_dev, u64 snap_id, |
| 1852 | struct ceph_object_id *oid) |
| 1853 | { |
| 1854 | if (snap_id == CEPH_NOSNAP) |
| 1855 | ceph_oid_printf(oid, "%s%s", RBD_OBJECT_MAP_PREFIX, |
| 1856 | rbd_dev->spec->image_id); |
| 1857 | else |
| 1858 | ceph_oid_printf(oid, "%s%s.%016llx", RBD_OBJECT_MAP_PREFIX, |
| 1859 | rbd_dev->spec->image_id, snap_id); |
| 1860 | } |
| 1861 | |
| 1862 | static int rbd_object_map_lock(struct rbd_device *rbd_dev) |
| 1863 | { |
| 1864 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 1865 | CEPH_DEFINE_OID_ONSTACK(oid); |
| 1866 | u8 lock_type; |
| 1867 | char *lock_tag; |
| 1868 | struct ceph_locker *lockers; |
| 1869 | u32 num_lockers; |
| 1870 | bool broke_lock = false; |
| 1871 | int ret; |
| 1872 | |
| 1873 | rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); |
| 1874 | |
| 1875 | again: |
| 1876 | ret = ceph_cls_lock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| 1877 | CEPH_CLS_LOCK_EXCLUSIVE, "", "", "", 0); |
| 1878 | if (ret != -EBUSY || broke_lock) { |
| 1879 | if (ret == -EEXIST) |
| 1880 | ret = 0; /* already locked by myself */ |
| 1881 | if (ret) |
| 1882 | rbd_warn(rbd_dev, "failed to lock object map: %d", ret); |
| 1883 | return ret; |
| 1884 | } |
| 1885 | |
| 1886 | ret = ceph_cls_lock_info(osdc, &oid, &rbd_dev->header_oloc, |
| 1887 | RBD_LOCK_NAME, &lock_type, &lock_tag, |
| 1888 | &lockers, &num_lockers); |
| 1889 | if (ret) { |
| 1890 | if (ret == -ENOENT) |
| 1891 | goto again; |
| 1892 | |
| 1893 | rbd_warn(rbd_dev, "failed to get object map lockers: %d", ret); |
| 1894 | return ret; |
| 1895 | } |
| 1896 | |
| 1897 | kfree(lock_tag); |
| 1898 | if (num_lockers == 0) |
| 1899 | goto again; |
| 1900 | |
| 1901 | rbd_warn(rbd_dev, "breaking object map lock owned by %s%llu", |
| 1902 | ENTITY_NAME(lockers[0].id.name)); |
| 1903 | |
| 1904 | ret = ceph_cls_break_lock(osdc, &oid, &rbd_dev->header_oloc, |
| 1905 | RBD_LOCK_NAME, lockers[0].id.cookie, |
| 1906 | &lockers[0].id.name); |
| 1907 | ceph_free_lockers(lockers, num_lockers); |
| 1908 | if (ret) { |
| 1909 | if (ret == -ENOENT) |
| 1910 | goto again; |
| 1911 | |
| 1912 | rbd_warn(rbd_dev, "failed to break object map lock: %d", ret); |
| 1913 | return ret; |
| 1914 | } |
| 1915 | |
| 1916 | broke_lock = true; |
| 1917 | goto again; |
| 1918 | } |
| 1919 | |
| 1920 | static void rbd_object_map_unlock(struct rbd_device *rbd_dev) |
| 1921 | { |
| 1922 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 1923 | CEPH_DEFINE_OID_ONSTACK(oid); |
| 1924 | int ret; |
| 1925 | |
| 1926 | rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); |
| 1927 | |
| 1928 | ret = ceph_cls_unlock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| 1929 | ""); |
| 1930 | if (ret && ret != -ENOENT) |
| 1931 | rbd_warn(rbd_dev, "failed to unlock object map: %d", ret); |
| 1932 | } |
| 1933 | |
| 1934 | static int decode_object_map_header(void **p, void *end, u64 *object_map_size) |
| 1935 | { |
| 1936 | u8 struct_v; |
| 1937 | u32 struct_len; |
| 1938 | u32 header_len; |
| 1939 | void *header_end; |
| 1940 | int ret; |
| 1941 | |
| 1942 | ceph_decode_32_safe(p, end, header_len, e_inval); |
| 1943 | header_end = *p + header_len; |
| 1944 | |
| 1945 | ret = ceph_start_decoding(p, end, 1, "BitVector header", &struct_v, |
| 1946 | &struct_len); |
| 1947 | if (ret) |
| 1948 | return ret; |
| 1949 | |
| 1950 | ceph_decode_64_safe(p, end, *object_map_size, e_inval); |
| 1951 | |
| 1952 | *p = header_end; |
| 1953 | return 0; |
| 1954 | |
| 1955 | e_inval: |
| 1956 | return -EINVAL; |
| 1957 | } |
| 1958 | |
| 1959 | static int __rbd_object_map_load(struct rbd_device *rbd_dev) |
| 1960 | { |
| 1961 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 1962 | CEPH_DEFINE_OID_ONSTACK(oid); |
| 1963 | struct page **pages; |
| 1964 | void *p, *end; |
| 1965 | size_t reply_len; |
| 1966 | u64 num_objects; |
| 1967 | u64 object_map_bytes; |
| 1968 | u64 object_map_size; |
| 1969 | int num_pages; |
| 1970 | int ret; |
| 1971 | |
| 1972 | rbd_assert(!rbd_dev->object_map && !rbd_dev->object_map_size); |
| 1973 | |
| 1974 | num_objects = ceph_get_num_objects(&rbd_dev->layout, |
| 1975 | rbd_dev->mapping.size); |
| 1976 | object_map_bytes = DIV_ROUND_UP_ULL(num_objects * BITS_PER_OBJ, |
| 1977 | BITS_PER_BYTE); |
| 1978 | num_pages = calc_pages_for(0, object_map_bytes) + 1; |
| 1979 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
| 1980 | if (IS_ERR(pages)) |
| 1981 | return PTR_ERR(pages); |
| 1982 | |
| 1983 | reply_len = num_pages * PAGE_SIZE; |
| 1984 | rbd_object_map_name(rbd_dev, rbd_dev->spec->snap_id, &oid); |
| 1985 | ret = ceph_osdc_call(osdc, &oid, &rbd_dev->header_oloc, |
| 1986 | "rbd", "object_map_load", CEPH_OSD_FLAG_READ, |
| 1987 | NULL, 0, pages, &reply_len); |
| 1988 | if (ret) |
| 1989 | goto out; |
| 1990 | |
| 1991 | p = page_address(pages[0]); |
| 1992 | end = p + min(reply_len, (size_t)PAGE_SIZE); |
| 1993 | ret = decode_object_map_header(&p, end, &object_map_size); |
| 1994 | if (ret) |
| 1995 | goto out; |
| 1996 | |
| 1997 | if (object_map_size != num_objects) { |
| 1998 | rbd_warn(rbd_dev, "object map size mismatch: %llu vs %llu", |
| 1999 | object_map_size, num_objects); |
| 2000 | ret = -EINVAL; |
| 2001 | goto out; |
| 2002 | } |
| 2003 | |
| 2004 | if (offset_in_page(p) + object_map_bytes > reply_len) { |
| 2005 | ret = -EINVAL; |
| 2006 | goto out; |
| 2007 | } |
| 2008 | |
| 2009 | rbd_dev->object_map = kvmalloc(object_map_bytes, GFP_KERNEL); |
| 2010 | if (!rbd_dev->object_map) { |
| 2011 | ret = -ENOMEM; |
| 2012 | goto out; |
| 2013 | } |
| 2014 | |
| 2015 | rbd_dev->object_map_size = object_map_size; |
| 2016 | ceph_copy_from_page_vector(pages, rbd_dev->object_map, |
| 2017 | offset_in_page(p), object_map_bytes); |
| 2018 | |
| 2019 | out: |
| 2020 | ceph_release_page_vector(pages, num_pages); |
| 2021 | return ret; |
| 2022 | } |
| 2023 | |
| 2024 | static void rbd_object_map_free(struct rbd_device *rbd_dev) |
| 2025 | { |
| 2026 | kvfree(rbd_dev->object_map); |
| 2027 | rbd_dev->object_map = NULL; |
| 2028 | rbd_dev->object_map_size = 0; |
| 2029 | } |
| 2030 | |
| 2031 | static int rbd_object_map_load(struct rbd_device *rbd_dev) |
| 2032 | { |
| 2033 | int ret; |
| 2034 | |
| 2035 | ret = __rbd_object_map_load(rbd_dev); |
| 2036 | if (ret) |
| 2037 | return ret; |
| 2038 | |
| 2039 | ret = rbd_dev_v2_get_flags(rbd_dev); |
| 2040 | if (ret) { |
| 2041 | rbd_object_map_free(rbd_dev); |
| 2042 | return ret; |
| 2043 | } |
| 2044 | |
| 2045 | if (rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID) |
| 2046 | rbd_warn(rbd_dev, "object map is invalid"); |
| 2047 | |
| 2048 | return 0; |
| 2049 | } |
| 2050 | |
| 2051 | static int rbd_object_map_open(struct rbd_device *rbd_dev) |
| 2052 | { |
| 2053 | int ret; |
| 2054 | |
| 2055 | ret = rbd_object_map_lock(rbd_dev); |
| 2056 | if (ret) |
| 2057 | return ret; |
| 2058 | |
| 2059 | ret = rbd_object_map_load(rbd_dev); |
| 2060 | if (ret) { |
| 2061 | rbd_object_map_unlock(rbd_dev); |
| 2062 | return ret; |
| 2063 | } |
| 2064 | |
| 2065 | return 0; |
| 2066 | } |
| 2067 | |
| 2068 | static void rbd_object_map_close(struct rbd_device *rbd_dev) |
| 2069 | { |
| 2070 | rbd_object_map_free(rbd_dev); |
| 2071 | rbd_object_map_unlock(rbd_dev); |
| 2072 | } |
| 2073 | |
| 2074 | /* |
| 2075 | * This function needs snap_id (or more precisely just something to |
| 2076 | * distinguish between HEAD and snapshot object maps), new_state and |
| 2077 | * current_state that were passed to rbd_object_map_update(). |
| 2078 | * |
| 2079 | * To avoid allocating and stashing a context we piggyback on the OSD |
| 2080 | * request. A HEAD update has two ops (assert_locked). For new_state |
| 2081 | * and current_state we decode our own object_map_update op, encoded in |
| 2082 | * rbd_cls_object_map_update(). |
| 2083 | */ |
| 2084 | static int rbd_object_map_update_finish(struct rbd_obj_request *obj_req, |
| 2085 | struct ceph_osd_request *osd_req) |
| 2086 | { |
| 2087 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2088 | struct ceph_osd_data *osd_data; |
| 2089 | u64 objno; |
| 2090 | u8 state, new_state, current_state; |
| 2091 | bool has_current_state; |
| 2092 | void *p; |
| 2093 | |
| 2094 | if (osd_req->r_result) |
| 2095 | return osd_req->r_result; |
| 2096 | |
| 2097 | /* |
| 2098 | * Nothing to do for a snapshot object map. |
| 2099 | */ |
| 2100 | if (osd_req->r_num_ops == 1) |
| 2101 | return 0; |
| 2102 | |
| 2103 | /* |
| 2104 | * Update in-memory HEAD object map. |
| 2105 | */ |
| 2106 | rbd_assert(osd_req->r_num_ops == 2); |
| 2107 | osd_data = osd_req_op_data(osd_req, 1, cls, request_data); |
| 2108 | rbd_assert(osd_data->type == CEPH_OSD_DATA_TYPE_PAGES); |
| 2109 | |
| 2110 | p = page_address(osd_data->pages[0]); |
| 2111 | objno = ceph_decode_64(&p); |
| 2112 | rbd_assert(objno == obj_req->ex.oe_objno); |
| 2113 | rbd_assert(ceph_decode_64(&p) == objno + 1); |
| 2114 | new_state = ceph_decode_8(&p); |
| 2115 | has_current_state = ceph_decode_8(&p); |
| 2116 | if (has_current_state) |
| 2117 | current_state = ceph_decode_8(&p); |
| 2118 | |
| 2119 | spin_lock(&rbd_dev->object_map_lock); |
| 2120 | state = __rbd_object_map_get(rbd_dev, objno); |
| 2121 | if (!has_current_state || current_state == state || |
| 2122 | (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) |
| 2123 | __rbd_object_map_set(rbd_dev, objno, new_state); |
| 2124 | spin_unlock(&rbd_dev->object_map_lock); |
| 2125 | |
| 2126 | return 0; |
| 2127 | } |
| 2128 | |
| 2129 | static void rbd_object_map_callback(struct ceph_osd_request *osd_req) |
| 2130 | { |
| 2131 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2132 | int result; |
| 2133 | |
| 2134 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
| 2135 | osd_req->r_result, obj_req); |
| 2136 | |
| 2137 | result = rbd_object_map_update_finish(obj_req, osd_req); |
| 2138 | rbd_obj_handle_request(obj_req, result); |
| 2139 | } |
| 2140 | |
| 2141 | static bool update_needed(struct rbd_device *rbd_dev, u64 objno, u8 new_state) |
| 2142 | { |
| 2143 | u8 state = rbd_object_map_get(rbd_dev, objno); |
| 2144 | |
| 2145 | if (state == new_state || |
| 2146 | (new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) || |
| 2147 | (new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) |
| 2148 | return false; |
| 2149 | |
| 2150 | return true; |
| 2151 | } |
| 2152 | |
| 2153 | static int rbd_cls_object_map_update(struct ceph_osd_request *req, |
| 2154 | int which, u64 objno, u8 new_state, |
| 2155 | const u8 *current_state) |
| 2156 | { |
| 2157 | struct page **pages; |
| 2158 | void *p, *start; |
| 2159 | int ret; |
| 2160 | |
| 2161 | ret = osd_req_op_cls_init(req, which, "rbd", "object_map_update"); |
| 2162 | if (ret) |
| 2163 | return ret; |
| 2164 | |
| 2165 | pages = ceph_alloc_page_vector(1, GFP_NOIO); |
| 2166 | if (IS_ERR(pages)) |
| 2167 | return PTR_ERR(pages); |
| 2168 | |
| 2169 | p = start = page_address(pages[0]); |
| 2170 | ceph_encode_64(&p, objno); |
| 2171 | ceph_encode_64(&p, objno + 1); |
| 2172 | ceph_encode_8(&p, new_state); |
| 2173 | if (current_state) { |
| 2174 | ceph_encode_8(&p, 1); |
| 2175 | ceph_encode_8(&p, *current_state); |
| 2176 | } else { |
| 2177 | ceph_encode_8(&p, 0); |
| 2178 | } |
| 2179 | |
| 2180 | osd_req_op_cls_request_data_pages(req, which, pages, p - start, 0, |
| 2181 | false, true); |
| 2182 | return 0; |
| 2183 | } |
| 2184 | |
| 2185 | /* |
| 2186 | * Return: |
| 2187 | * 0 - object map update sent |
| 2188 | * 1 - object map update isn't needed |
| 2189 | * <0 - error |
| 2190 | */ |
| 2191 | static int rbd_object_map_update(struct rbd_obj_request *obj_req, u64 snap_id, |
| 2192 | u8 new_state, const u8 *current_state) |
| 2193 | { |
| 2194 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2195 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 2196 | struct ceph_osd_request *req; |
| 2197 | int num_ops = 1; |
| 2198 | int which = 0; |
| 2199 | int ret; |
| 2200 | |
| 2201 | if (snap_id == CEPH_NOSNAP) { |
| 2202 | if (!update_needed(rbd_dev, obj_req->ex.oe_objno, new_state)) |
| 2203 | return 1; |
| 2204 | |
| 2205 | num_ops++; /* assert_locked */ |
| 2206 | } |
| 2207 | |
| 2208 | req = ceph_osdc_alloc_request(osdc, NULL, num_ops, false, GFP_NOIO); |
| 2209 | if (!req) |
| 2210 | return -ENOMEM; |
| 2211 | |
| 2212 | list_add_tail(&req->r_private_item, &obj_req->osd_reqs); |
| 2213 | req->r_callback = rbd_object_map_callback; |
| 2214 | req->r_priv = obj_req; |
| 2215 | |
| 2216 | rbd_object_map_name(rbd_dev, snap_id, &req->r_base_oid); |
| 2217 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); |
| 2218 | req->r_flags = CEPH_OSD_FLAG_WRITE; |
| 2219 | ktime_get_real_ts64(&req->r_mtime); |
| 2220 | |
| 2221 | if (snap_id == CEPH_NOSNAP) { |
| 2222 | /* |
| 2223 | * Protect against possible race conditions during lock |
| 2224 | * ownership transitions. |
| 2225 | */ |
| 2226 | ret = ceph_cls_assert_locked(req, which++, RBD_LOCK_NAME, |
| 2227 | CEPH_CLS_LOCK_EXCLUSIVE, "", ""); |
| 2228 | if (ret) |
| 2229 | return ret; |
| 2230 | } |
| 2231 | |
| 2232 | ret = rbd_cls_object_map_update(req, which, obj_req->ex.oe_objno, |
| 2233 | new_state, current_state); |
| 2234 | if (ret) |
| 2235 | return ret; |
| 2236 | |
| 2237 | ret = ceph_osdc_alloc_messages(req, GFP_NOIO); |
| 2238 | if (ret) |
| 2239 | return ret; |
| 2240 | |
| 2241 | ceph_osdc_start_request(osdc, req, false); |
| 2242 | return 0; |
| 2243 | } |
| 2244 | |
| 2245 | static void prune_extents(struct ceph_file_extent *img_extents, |
| 2246 | u32 *num_img_extents, u64 overlap) |
| 2247 | { |
| 2248 | u32 cnt = *num_img_extents; |
| 2249 | |
| 2250 | /* drop extents completely beyond the overlap */ |
| 2251 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) |
| 2252 | cnt--; |
| 2253 | |
| 2254 | if (cnt) { |
| 2255 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; |
| 2256 | |
| 2257 | /* trim final overlapping extent */ |
| 2258 | if (ex->fe_off + ex->fe_len > overlap) |
| 2259 | ex->fe_len = overlap - ex->fe_off; |
| 2260 | } |
| 2261 | |
| 2262 | *num_img_extents = cnt; |
| 2263 | } |
| 2264 | |
| 2265 | /* |
| 2266 | * Determine the byte range(s) covered by either just the object extent |
| 2267 | * or the entire object in the parent image. |
| 2268 | */ |
| 2269 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, |
| 2270 | bool entire) |
| 2271 | { |
| 2272 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2273 | int ret; |
| 2274 | |
| 2275 | if (!rbd_dev->parent_overlap) |
| 2276 | return 0; |
| 2277 | |
| 2278 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
| 2279 | entire ? 0 : obj_req->ex.oe_off, |
| 2280 | entire ? rbd_dev->layout.object_size : |
| 2281 | obj_req->ex.oe_len, |
| 2282 | &obj_req->img_extents, |
| 2283 | &obj_req->num_img_extents); |
| 2284 | if (ret) |
| 2285 | return ret; |
| 2286 | |
| 2287 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
| 2288 | rbd_dev->parent_overlap); |
| 2289 | return 0; |
| 2290 | } |
| 2291 | |
| 2292 | static void rbd_osd_setup_data(struct ceph_osd_request *osd_req, int which) |
| 2293 | { |
| 2294 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2295 | |
| 2296 | switch (obj_req->img_request->data_type) { |
| 2297 | case OBJ_REQUEST_BIO: |
| 2298 | osd_req_op_extent_osd_data_bio(osd_req, which, |
| 2299 | &obj_req->bio_pos, |
| 2300 | obj_req->ex.oe_len); |
| 2301 | break; |
| 2302 | case OBJ_REQUEST_BVECS: |
| 2303 | case OBJ_REQUEST_OWN_BVECS: |
| 2304 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
| 2305 | obj_req->ex.oe_len); |
| 2306 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
| 2307 | osd_req_op_extent_osd_data_bvec_pos(osd_req, which, |
| 2308 | &obj_req->bvec_pos); |
| 2309 | break; |
| 2310 | default: |
| 2311 | BUG(); |
| 2312 | } |
| 2313 | } |
| 2314 | |
| 2315 | static int rbd_osd_setup_stat(struct ceph_osd_request *osd_req, int which) |
| 2316 | { |
| 2317 | struct page **pages; |
| 2318 | |
| 2319 | /* |
| 2320 | * The response data for a STAT call consists of: |
| 2321 | * le64 length; |
| 2322 | * struct { |
| 2323 | * le32 tv_sec; |
| 2324 | * le32 tv_nsec; |
| 2325 | * } mtime; |
| 2326 | */ |
| 2327 | pages = ceph_alloc_page_vector(1, GFP_NOIO); |
| 2328 | if (IS_ERR(pages)) |
| 2329 | return PTR_ERR(pages); |
| 2330 | |
| 2331 | osd_req_op_init(osd_req, which, CEPH_OSD_OP_STAT, 0); |
| 2332 | osd_req_op_raw_data_in_pages(osd_req, which, pages, |
| 2333 | 8 + sizeof(struct ceph_timespec), |
| 2334 | 0, false, true); |
| 2335 | return 0; |
| 2336 | } |
| 2337 | |
| 2338 | static int rbd_osd_setup_copyup(struct ceph_osd_request *osd_req, int which, |
| 2339 | u32 bytes) |
| 2340 | { |
| 2341 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2342 | int ret; |
| 2343 | |
| 2344 | ret = osd_req_op_cls_init(osd_req, which, "rbd", "copyup"); |
| 2345 | if (ret) |
| 2346 | return ret; |
| 2347 | |
| 2348 | osd_req_op_cls_request_data_bvecs(osd_req, which, obj_req->copyup_bvecs, |
| 2349 | obj_req->copyup_bvec_count, bytes); |
| 2350 | return 0; |
| 2351 | } |
| 2352 | |
| 2353 | static int rbd_obj_init_read(struct rbd_obj_request *obj_req) |
| 2354 | { |
| 2355 | obj_req->read_state = RBD_OBJ_READ_START; |
| 2356 | return 0; |
| 2357 | } |
| 2358 | |
| 2359 | static void __rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
| 2360 | int which) |
| 2361 | { |
| 2362 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2363 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2364 | u16 opcode; |
| 2365 | |
| 2366 | if (!use_object_map(rbd_dev) || |
| 2367 | !(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) { |
| 2368 | osd_req_op_alloc_hint_init(osd_req, which++, |
| 2369 | rbd_dev->layout.object_size, |
| 2370 | rbd_dev->layout.object_size); |
| 2371 | } |
| 2372 | |
| 2373 | if (rbd_obj_is_entire(obj_req)) |
| 2374 | opcode = CEPH_OSD_OP_WRITEFULL; |
| 2375 | else |
| 2376 | opcode = CEPH_OSD_OP_WRITE; |
| 2377 | |
| 2378 | osd_req_op_extent_init(osd_req, which, opcode, |
| 2379 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
| 2380 | rbd_osd_setup_data(osd_req, which); |
| 2381 | } |
| 2382 | |
| 2383 | static int rbd_obj_init_write(struct rbd_obj_request *obj_req) |
| 2384 | { |
| 2385 | int ret; |
| 2386 | |
| 2387 | /* reverse map the entire object onto the parent */ |
| 2388 | ret = rbd_obj_calc_img_extents(obj_req, true); |
| 2389 | if (ret) |
| 2390 | return ret; |
| 2391 | |
| 2392 | if (rbd_obj_copyup_enabled(obj_req)) |
| 2393 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; |
| 2394 | |
| 2395 | obj_req->write_state = RBD_OBJ_WRITE_START; |
| 2396 | return 0; |
| 2397 | } |
| 2398 | |
| 2399 | static u16 truncate_or_zero_opcode(struct rbd_obj_request *obj_req) |
| 2400 | { |
| 2401 | return rbd_obj_is_tail(obj_req) ? CEPH_OSD_OP_TRUNCATE : |
| 2402 | CEPH_OSD_OP_ZERO; |
| 2403 | } |
| 2404 | |
| 2405 | static void __rbd_osd_setup_discard_ops(struct ceph_osd_request *osd_req, |
| 2406 | int which) |
| 2407 | { |
| 2408 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2409 | |
| 2410 | if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) { |
| 2411 | rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); |
| 2412 | osd_req_op_init(osd_req, which, CEPH_OSD_OP_DELETE, 0); |
| 2413 | } else { |
| 2414 | osd_req_op_extent_init(osd_req, which, |
| 2415 | truncate_or_zero_opcode(obj_req), |
| 2416 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
| 2417 | 0, 0); |
| 2418 | } |
| 2419 | } |
| 2420 | |
| 2421 | static int rbd_obj_init_discard(struct rbd_obj_request *obj_req) |
| 2422 | { |
| 2423 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2424 | u64 off, next_off; |
| 2425 | int ret; |
| 2426 | |
| 2427 | /* |
| 2428 | * Align the range to alloc_size boundary and punt on discards |
| 2429 | * that are too small to free up any space. |
| 2430 | * |
| 2431 | * alloc_size == object_size && is_tail() is a special case for |
| 2432 | * filestore with filestore_punch_hole = false, needed to allow |
| 2433 | * truncate (in addition to delete). |
| 2434 | */ |
| 2435 | if (rbd_dev->opts->alloc_size != rbd_dev->layout.object_size || |
| 2436 | !rbd_obj_is_tail(obj_req)) { |
| 2437 | off = round_up(obj_req->ex.oe_off, rbd_dev->opts->alloc_size); |
| 2438 | next_off = round_down(obj_req->ex.oe_off + obj_req->ex.oe_len, |
| 2439 | rbd_dev->opts->alloc_size); |
| 2440 | if (off >= next_off) |
| 2441 | return 1; |
| 2442 | |
| 2443 | dout("%s %p %llu~%llu -> %llu~%llu\n", __func__, |
| 2444 | obj_req, obj_req->ex.oe_off, obj_req->ex.oe_len, |
| 2445 | off, next_off - off); |
| 2446 | obj_req->ex.oe_off = off; |
| 2447 | obj_req->ex.oe_len = next_off - off; |
| 2448 | } |
| 2449 | |
| 2450 | /* reverse map the entire object onto the parent */ |
| 2451 | ret = rbd_obj_calc_img_extents(obj_req, true); |
| 2452 | if (ret) |
| 2453 | return ret; |
| 2454 | |
| 2455 | obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
| 2456 | if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) |
| 2457 | obj_req->flags |= RBD_OBJ_FLAG_DELETION; |
| 2458 | |
| 2459 | obj_req->write_state = RBD_OBJ_WRITE_START; |
| 2460 | return 0; |
| 2461 | } |
| 2462 | |
| 2463 | static void __rbd_osd_setup_zeroout_ops(struct ceph_osd_request *osd_req, |
| 2464 | int which) |
| 2465 | { |
| 2466 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2467 | u16 opcode; |
| 2468 | |
| 2469 | if (rbd_obj_is_entire(obj_req)) { |
| 2470 | if (obj_req->num_img_extents) { |
| 2471 | if (!(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) |
| 2472 | osd_req_op_init(osd_req, which++, |
| 2473 | CEPH_OSD_OP_CREATE, 0); |
| 2474 | opcode = CEPH_OSD_OP_TRUNCATE; |
| 2475 | } else { |
| 2476 | rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); |
| 2477 | osd_req_op_init(osd_req, which++, |
| 2478 | CEPH_OSD_OP_DELETE, 0); |
| 2479 | opcode = 0; |
| 2480 | } |
| 2481 | } else { |
| 2482 | opcode = truncate_or_zero_opcode(obj_req); |
| 2483 | } |
| 2484 | |
| 2485 | if (opcode) |
| 2486 | osd_req_op_extent_init(osd_req, which, opcode, |
| 2487 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
| 2488 | 0, 0); |
| 2489 | } |
| 2490 | |
| 2491 | static int rbd_obj_init_zeroout(struct rbd_obj_request *obj_req) |
| 2492 | { |
| 2493 | int ret; |
| 2494 | |
| 2495 | /* reverse map the entire object onto the parent */ |
| 2496 | ret = rbd_obj_calc_img_extents(obj_req, true); |
| 2497 | if (ret) |
| 2498 | return ret; |
| 2499 | |
| 2500 | if (rbd_obj_copyup_enabled(obj_req)) |
| 2501 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; |
| 2502 | if (!obj_req->num_img_extents) { |
| 2503 | obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
| 2504 | if (rbd_obj_is_entire(obj_req)) |
| 2505 | obj_req->flags |= RBD_OBJ_FLAG_DELETION; |
| 2506 | } |
| 2507 | |
| 2508 | obj_req->write_state = RBD_OBJ_WRITE_START; |
| 2509 | return 0; |
| 2510 | } |
| 2511 | |
| 2512 | static int count_write_ops(struct rbd_obj_request *obj_req) |
| 2513 | { |
| 2514 | struct rbd_img_request *img_req = obj_req->img_request; |
| 2515 | |
| 2516 | switch (img_req->op_type) { |
| 2517 | case OBJ_OP_WRITE: |
| 2518 | if (!use_object_map(img_req->rbd_dev) || |
| 2519 | !(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) |
| 2520 | return 2; /* setallochint + write/writefull */ |
| 2521 | |
| 2522 | return 1; /* write/writefull */ |
| 2523 | case OBJ_OP_DISCARD: |
| 2524 | return 1; /* delete/truncate/zero */ |
| 2525 | case OBJ_OP_ZEROOUT: |
| 2526 | if (rbd_obj_is_entire(obj_req) && obj_req->num_img_extents && |
| 2527 | !(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) |
| 2528 | return 2; /* create + truncate */ |
| 2529 | |
| 2530 | return 1; /* delete/truncate/zero */ |
| 2531 | default: |
| 2532 | BUG(); |
| 2533 | } |
| 2534 | } |
| 2535 | |
| 2536 | static void rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
| 2537 | int which) |
| 2538 | { |
| 2539 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
| 2540 | |
| 2541 | switch (obj_req->img_request->op_type) { |
| 2542 | case OBJ_OP_WRITE: |
| 2543 | __rbd_osd_setup_write_ops(osd_req, which); |
| 2544 | break; |
| 2545 | case OBJ_OP_DISCARD: |
| 2546 | __rbd_osd_setup_discard_ops(osd_req, which); |
| 2547 | break; |
| 2548 | case OBJ_OP_ZEROOUT: |
| 2549 | __rbd_osd_setup_zeroout_ops(osd_req, which); |
| 2550 | break; |
| 2551 | default: |
| 2552 | BUG(); |
| 2553 | } |
| 2554 | } |
| 2555 | |
| 2556 | /* |
| 2557 | * Prune the list of object requests (adjust offset and/or length, drop |
| 2558 | * redundant requests). Prepare object request state machines and image |
| 2559 | * request state machine for execution. |
| 2560 | */ |
| 2561 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) |
| 2562 | { |
| 2563 | struct rbd_obj_request *obj_req, *next_obj_req; |
| 2564 | int ret; |
| 2565 | |
| 2566 | for_each_obj_request_safe(img_req, obj_req, next_obj_req) { |
| 2567 | switch (img_req->op_type) { |
| 2568 | case OBJ_OP_READ: |
| 2569 | ret = rbd_obj_init_read(obj_req); |
| 2570 | break; |
| 2571 | case OBJ_OP_WRITE: |
| 2572 | ret = rbd_obj_init_write(obj_req); |
| 2573 | break; |
| 2574 | case OBJ_OP_DISCARD: |
| 2575 | ret = rbd_obj_init_discard(obj_req); |
| 2576 | break; |
| 2577 | case OBJ_OP_ZEROOUT: |
| 2578 | ret = rbd_obj_init_zeroout(obj_req); |
| 2579 | break; |
| 2580 | default: |
| 2581 | BUG(); |
| 2582 | } |
| 2583 | if (ret < 0) |
| 2584 | return ret; |
| 2585 | if (ret > 0) { |
| 2586 | rbd_img_obj_request_del(img_req, obj_req); |
| 2587 | continue; |
| 2588 | } |
| 2589 | } |
| 2590 | |
| 2591 | img_req->state = RBD_IMG_START; |
| 2592 | return 0; |
| 2593 | } |
| 2594 | |
| 2595 | union rbd_img_fill_iter { |
| 2596 | struct ceph_bio_iter bio_iter; |
| 2597 | struct ceph_bvec_iter bvec_iter; |
| 2598 | }; |
| 2599 | |
| 2600 | struct rbd_img_fill_ctx { |
| 2601 | enum obj_request_type pos_type; |
| 2602 | union rbd_img_fill_iter *pos; |
| 2603 | union rbd_img_fill_iter iter; |
| 2604 | ceph_object_extent_fn_t set_pos_fn; |
| 2605 | ceph_object_extent_fn_t count_fn; |
| 2606 | ceph_object_extent_fn_t copy_fn; |
| 2607 | }; |
| 2608 | |
| 2609 | static struct ceph_object_extent *alloc_object_extent(void *arg) |
| 2610 | { |
| 2611 | struct rbd_img_request *img_req = arg; |
| 2612 | struct rbd_obj_request *obj_req; |
| 2613 | |
| 2614 | obj_req = rbd_obj_request_create(); |
| 2615 | if (!obj_req) |
| 2616 | return NULL; |
| 2617 | |
| 2618 | rbd_img_obj_request_add(img_req, obj_req); |
| 2619 | return &obj_req->ex; |
| 2620 | } |
| 2621 | |
| 2622 | /* |
| 2623 | * While su != os && sc == 1 is technically not fancy (it's the same |
| 2624 | * layout as su == os && sc == 1), we can't use the nocopy path for it |
| 2625 | * because ->set_pos_fn() should be called only once per object. |
| 2626 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so |
| 2627 | * treat su != os && sc == 1 as fancy. |
| 2628 | */ |
| 2629 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) |
| 2630 | { |
| 2631 | return l->stripe_unit != l->object_size; |
| 2632 | } |
| 2633 | |
| 2634 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
| 2635 | struct ceph_file_extent *img_extents, |
| 2636 | u32 num_img_extents, |
| 2637 | struct rbd_img_fill_ctx *fctx) |
| 2638 | { |
| 2639 | u32 i; |
| 2640 | int ret; |
| 2641 | |
| 2642 | img_req->data_type = fctx->pos_type; |
| 2643 | |
| 2644 | /* |
| 2645 | * Create object requests and set each object request's starting |
| 2646 | * position in the provided bio (list) or bio_vec array. |
| 2647 | */ |
| 2648 | fctx->iter = *fctx->pos; |
| 2649 | for (i = 0; i < num_img_extents; i++) { |
| 2650 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, |
| 2651 | img_extents[i].fe_off, |
| 2652 | img_extents[i].fe_len, |
| 2653 | &img_req->object_extents, |
| 2654 | alloc_object_extent, img_req, |
| 2655 | fctx->set_pos_fn, &fctx->iter); |
| 2656 | if (ret) |
| 2657 | return ret; |
| 2658 | } |
| 2659 | |
| 2660 | return __rbd_img_fill_request(img_req); |
| 2661 | } |
| 2662 | |
| 2663 | /* |
| 2664 | * Map a list of image extents to a list of object extents, create the |
| 2665 | * corresponding object requests (normally each to a different object, |
| 2666 | * but not always) and add them to @img_req. For each object request, |
| 2667 | * set up its data descriptor to point to the corresponding chunk(s) of |
| 2668 | * @fctx->pos data buffer. |
| 2669 | * |
| 2670 | * Because ceph_file_to_extents() will merge adjacent object extents |
| 2671 | * together, each object request's data descriptor may point to multiple |
| 2672 | * different chunks of @fctx->pos data buffer. |
| 2673 | * |
| 2674 | * @fctx->pos data buffer is assumed to be large enough. |
| 2675 | */ |
| 2676 | static int rbd_img_fill_request(struct rbd_img_request *img_req, |
| 2677 | struct ceph_file_extent *img_extents, |
| 2678 | u32 num_img_extents, |
| 2679 | struct rbd_img_fill_ctx *fctx) |
| 2680 | { |
| 2681 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 2682 | struct rbd_obj_request *obj_req; |
| 2683 | u32 i; |
| 2684 | int ret; |
| 2685 | |
| 2686 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
| 2687 | !rbd_layout_is_fancy(&rbd_dev->layout)) |
| 2688 | return rbd_img_fill_request_nocopy(img_req, img_extents, |
| 2689 | num_img_extents, fctx); |
| 2690 | |
| 2691 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
| 2692 | |
| 2693 | /* |
| 2694 | * Create object requests and determine ->bvec_count for each object |
| 2695 | * request. Note that ->bvec_count sum over all object requests may |
| 2696 | * be greater than the number of bio_vecs in the provided bio (list) |
| 2697 | * or bio_vec array because when mapped, those bio_vecs can straddle |
| 2698 | * stripe unit boundaries. |
| 2699 | */ |
| 2700 | fctx->iter = *fctx->pos; |
| 2701 | for (i = 0; i < num_img_extents; i++) { |
| 2702 | ret = ceph_file_to_extents(&rbd_dev->layout, |
| 2703 | img_extents[i].fe_off, |
| 2704 | img_extents[i].fe_len, |
| 2705 | &img_req->object_extents, |
| 2706 | alloc_object_extent, img_req, |
| 2707 | fctx->count_fn, &fctx->iter); |
| 2708 | if (ret) |
| 2709 | return ret; |
| 2710 | } |
| 2711 | |
| 2712 | for_each_obj_request(img_req, obj_req) { |
| 2713 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, |
| 2714 | sizeof(*obj_req->bvec_pos.bvecs), |
| 2715 | GFP_NOIO); |
| 2716 | if (!obj_req->bvec_pos.bvecs) |
| 2717 | return -ENOMEM; |
| 2718 | } |
| 2719 | |
| 2720 | /* |
| 2721 | * Fill in each object request's private bio_vec array, splitting and |
| 2722 | * rearranging the provided bio_vecs in stripe unit chunks as needed. |
| 2723 | */ |
| 2724 | fctx->iter = *fctx->pos; |
| 2725 | for (i = 0; i < num_img_extents; i++) { |
| 2726 | ret = ceph_iterate_extents(&rbd_dev->layout, |
| 2727 | img_extents[i].fe_off, |
| 2728 | img_extents[i].fe_len, |
| 2729 | &img_req->object_extents, |
| 2730 | fctx->copy_fn, &fctx->iter); |
| 2731 | if (ret) |
| 2732 | return ret; |
| 2733 | } |
| 2734 | |
| 2735 | return __rbd_img_fill_request(img_req); |
| 2736 | } |
| 2737 | |
| 2738 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, |
| 2739 | u64 off, u64 len) |
| 2740 | { |
| 2741 | struct ceph_file_extent ex = { off, len }; |
| 2742 | union rbd_img_fill_iter dummy; |
| 2743 | struct rbd_img_fill_ctx fctx = { |
| 2744 | .pos_type = OBJ_REQUEST_NODATA, |
| 2745 | .pos = &dummy, |
| 2746 | }; |
| 2747 | |
| 2748 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); |
| 2749 | } |
| 2750 | |
| 2751 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2752 | { |
| 2753 | struct rbd_obj_request *obj_req = |
| 2754 | container_of(ex, struct rbd_obj_request, ex); |
| 2755 | struct ceph_bio_iter *it = arg; |
| 2756 | |
| 2757 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
| 2758 | obj_req->bio_pos = *it; |
| 2759 | ceph_bio_iter_advance(it, bytes); |
| 2760 | } |
| 2761 | |
| 2762 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2763 | { |
| 2764 | struct rbd_obj_request *obj_req = |
| 2765 | container_of(ex, struct rbd_obj_request, ex); |
| 2766 | struct ceph_bio_iter *it = arg; |
| 2767 | |
| 2768 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
| 2769 | ceph_bio_iter_advance_step(it, bytes, ({ |
| 2770 | obj_req->bvec_count++; |
| 2771 | })); |
| 2772 | |
| 2773 | } |
| 2774 | |
| 2775 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2776 | { |
| 2777 | struct rbd_obj_request *obj_req = |
| 2778 | container_of(ex, struct rbd_obj_request, ex); |
| 2779 | struct ceph_bio_iter *it = arg; |
| 2780 | |
| 2781 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
| 2782 | ceph_bio_iter_advance_step(it, bytes, ({ |
| 2783 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; |
| 2784 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; |
| 2785 | })); |
| 2786 | } |
| 2787 | |
| 2788 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
| 2789 | struct ceph_file_extent *img_extents, |
| 2790 | u32 num_img_extents, |
| 2791 | struct ceph_bio_iter *bio_pos) |
| 2792 | { |
| 2793 | struct rbd_img_fill_ctx fctx = { |
| 2794 | .pos_type = OBJ_REQUEST_BIO, |
| 2795 | .pos = (union rbd_img_fill_iter *)bio_pos, |
| 2796 | .set_pos_fn = set_bio_pos, |
| 2797 | .count_fn = count_bio_bvecs, |
| 2798 | .copy_fn = copy_bio_bvecs, |
| 2799 | }; |
| 2800 | |
| 2801 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
| 2802 | &fctx); |
| 2803 | } |
| 2804 | |
| 2805 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
| 2806 | u64 off, u64 len, struct bio *bio) |
| 2807 | { |
| 2808 | struct ceph_file_extent ex = { off, len }; |
| 2809 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; |
| 2810 | |
| 2811 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
| 2812 | } |
| 2813 | |
| 2814 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2815 | { |
| 2816 | struct rbd_obj_request *obj_req = |
| 2817 | container_of(ex, struct rbd_obj_request, ex); |
| 2818 | struct ceph_bvec_iter *it = arg; |
| 2819 | |
| 2820 | obj_req->bvec_pos = *it; |
| 2821 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); |
| 2822 | ceph_bvec_iter_advance(it, bytes); |
| 2823 | } |
| 2824 | |
| 2825 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2826 | { |
| 2827 | struct rbd_obj_request *obj_req = |
| 2828 | container_of(ex, struct rbd_obj_request, ex); |
| 2829 | struct ceph_bvec_iter *it = arg; |
| 2830 | |
| 2831 | ceph_bvec_iter_advance_step(it, bytes, ({ |
| 2832 | obj_req->bvec_count++; |
| 2833 | })); |
| 2834 | } |
| 2835 | |
| 2836 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
| 2837 | { |
| 2838 | struct rbd_obj_request *obj_req = |
| 2839 | container_of(ex, struct rbd_obj_request, ex); |
| 2840 | struct ceph_bvec_iter *it = arg; |
| 2841 | |
| 2842 | ceph_bvec_iter_advance_step(it, bytes, ({ |
| 2843 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; |
| 2844 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; |
| 2845 | })); |
| 2846 | } |
| 2847 | |
| 2848 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
| 2849 | struct ceph_file_extent *img_extents, |
| 2850 | u32 num_img_extents, |
| 2851 | struct ceph_bvec_iter *bvec_pos) |
| 2852 | { |
| 2853 | struct rbd_img_fill_ctx fctx = { |
| 2854 | .pos_type = OBJ_REQUEST_BVECS, |
| 2855 | .pos = (union rbd_img_fill_iter *)bvec_pos, |
| 2856 | .set_pos_fn = set_bvec_pos, |
| 2857 | .count_fn = count_bvecs, |
| 2858 | .copy_fn = copy_bvecs, |
| 2859 | }; |
| 2860 | |
| 2861 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
| 2862 | &fctx); |
| 2863 | } |
| 2864 | |
| 2865 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
| 2866 | struct ceph_file_extent *img_extents, |
| 2867 | u32 num_img_extents, |
| 2868 | struct bio_vec *bvecs) |
| 2869 | { |
| 2870 | struct ceph_bvec_iter it = { |
| 2871 | .bvecs = bvecs, |
| 2872 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, |
| 2873 | num_img_extents) }, |
| 2874 | }; |
| 2875 | |
| 2876 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
| 2877 | &it); |
| 2878 | } |
| 2879 | |
| 2880 | static void rbd_img_handle_request_work(struct work_struct *work) |
| 2881 | { |
| 2882 | struct rbd_img_request *img_req = |
| 2883 | container_of(work, struct rbd_img_request, work); |
| 2884 | |
| 2885 | rbd_img_handle_request(img_req, img_req->work_result); |
| 2886 | } |
| 2887 | |
| 2888 | static void rbd_img_schedule(struct rbd_img_request *img_req, int result) |
| 2889 | { |
| 2890 | INIT_WORK(&img_req->work, rbd_img_handle_request_work); |
| 2891 | img_req->work_result = result; |
| 2892 | queue_work(rbd_wq, &img_req->work); |
| 2893 | } |
| 2894 | |
| 2895 | static bool rbd_obj_may_exist(struct rbd_obj_request *obj_req) |
| 2896 | { |
| 2897 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2898 | |
| 2899 | if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) { |
| 2900 | obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; |
| 2901 | return true; |
| 2902 | } |
| 2903 | |
| 2904 | dout("%s %p objno %llu assuming dne\n", __func__, obj_req, |
| 2905 | obj_req->ex.oe_objno); |
| 2906 | return false; |
| 2907 | } |
| 2908 | |
| 2909 | static int rbd_obj_read_object(struct rbd_obj_request *obj_req) |
| 2910 | { |
| 2911 | struct ceph_osd_request *osd_req; |
| 2912 | int ret; |
| 2913 | |
| 2914 | osd_req = __rbd_obj_add_osd_request(obj_req, NULL, 1); |
| 2915 | if (IS_ERR(osd_req)) |
| 2916 | return PTR_ERR(osd_req); |
| 2917 | |
| 2918 | osd_req_op_extent_init(osd_req, 0, CEPH_OSD_OP_READ, |
| 2919 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
| 2920 | rbd_osd_setup_data(osd_req, 0); |
| 2921 | rbd_osd_format_read(osd_req); |
| 2922 | |
| 2923 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
| 2924 | if (ret) |
| 2925 | return ret; |
| 2926 | |
| 2927 | rbd_osd_submit(osd_req); |
| 2928 | return 0; |
| 2929 | } |
| 2930 | |
| 2931 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
| 2932 | { |
| 2933 | struct rbd_img_request *img_req = obj_req->img_request; |
| 2934 | struct rbd_img_request *child_img_req; |
| 2935 | int ret; |
| 2936 | |
| 2937 | child_img_req = rbd_img_request_create(img_req->rbd_dev->parent, |
| 2938 | OBJ_OP_READ, NULL); |
| 2939 | if (!child_img_req) |
| 2940 | return -ENOMEM; |
| 2941 | |
| 2942 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
| 2943 | child_img_req->obj_request = obj_req; |
| 2944 | |
| 2945 | dout("%s child_img_req %p for obj_req %p\n", __func__, child_img_req, |
| 2946 | obj_req); |
| 2947 | |
| 2948 | if (!rbd_img_is_write(img_req)) { |
| 2949 | switch (img_req->data_type) { |
| 2950 | case OBJ_REQUEST_BIO: |
| 2951 | ret = __rbd_img_fill_from_bio(child_img_req, |
| 2952 | obj_req->img_extents, |
| 2953 | obj_req->num_img_extents, |
| 2954 | &obj_req->bio_pos); |
| 2955 | break; |
| 2956 | case OBJ_REQUEST_BVECS: |
| 2957 | case OBJ_REQUEST_OWN_BVECS: |
| 2958 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
| 2959 | obj_req->img_extents, |
| 2960 | obj_req->num_img_extents, |
| 2961 | &obj_req->bvec_pos); |
| 2962 | break; |
| 2963 | default: |
| 2964 | BUG(); |
| 2965 | } |
| 2966 | } else { |
| 2967 | ret = rbd_img_fill_from_bvecs(child_img_req, |
| 2968 | obj_req->img_extents, |
| 2969 | obj_req->num_img_extents, |
| 2970 | obj_req->copyup_bvecs); |
| 2971 | } |
| 2972 | if (ret) { |
| 2973 | rbd_img_request_put(child_img_req); |
| 2974 | return ret; |
| 2975 | } |
| 2976 | |
| 2977 | /* avoid parent chain recursion */ |
| 2978 | rbd_img_schedule(child_img_req, 0); |
| 2979 | return 0; |
| 2980 | } |
| 2981 | |
| 2982 | static bool rbd_obj_advance_read(struct rbd_obj_request *obj_req, int *result) |
| 2983 | { |
| 2984 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 2985 | int ret; |
| 2986 | |
| 2987 | again: |
| 2988 | switch (obj_req->read_state) { |
| 2989 | case RBD_OBJ_READ_START: |
| 2990 | rbd_assert(!*result); |
| 2991 | |
| 2992 | if (!rbd_obj_may_exist(obj_req)) { |
| 2993 | *result = -ENOENT; |
| 2994 | obj_req->read_state = RBD_OBJ_READ_OBJECT; |
| 2995 | goto again; |
| 2996 | } |
| 2997 | |
| 2998 | ret = rbd_obj_read_object(obj_req); |
| 2999 | if (ret) { |
| 3000 | *result = ret; |
| 3001 | return true; |
| 3002 | } |
| 3003 | obj_req->read_state = RBD_OBJ_READ_OBJECT; |
| 3004 | return false; |
| 3005 | case RBD_OBJ_READ_OBJECT: |
| 3006 | if (*result == -ENOENT && rbd_dev->parent_overlap) { |
| 3007 | /* reverse map this object extent onto the parent */ |
| 3008 | ret = rbd_obj_calc_img_extents(obj_req, false); |
| 3009 | if (ret) { |
| 3010 | *result = ret; |
| 3011 | return true; |
| 3012 | } |
| 3013 | if (obj_req->num_img_extents) { |
| 3014 | ret = rbd_obj_read_from_parent(obj_req); |
| 3015 | if (ret) { |
| 3016 | *result = ret; |
| 3017 | return true; |
| 3018 | } |
| 3019 | obj_req->read_state = RBD_OBJ_READ_PARENT; |
| 3020 | return false; |
| 3021 | } |
| 3022 | } |
| 3023 | |
| 3024 | /* |
| 3025 | * -ENOENT means a hole in the image -- zero-fill the entire |
| 3026 | * length of the request. A short read also implies zero-fill |
| 3027 | * to the end of the request. |
| 3028 | */ |
| 3029 | if (*result == -ENOENT) { |
| 3030 | rbd_obj_zero_range(obj_req, 0, obj_req->ex.oe_len); |
| 3031 | *result = 0; |
| 3032 | } else if (*result >= 0) { |
| 3033 | if (*result < obj_req->ex.oe_len) |
| 3034 | rbd_obj_zero_range(obj_req, *result, |
| 3035 | obj_req->ex.oe_len - *result); |
| 3036 | else |
| 3037 | rbd_assert(*result == obj_req->ex.oe_len); |
| 3038 | *result = 0; |
| 3039 | } |
| 3040 | return true; |
| 3041 | case RBD_OBJ_READ_PARENT: |
| 3042 | /* |
| 3043 | * The parent image is read only up to the overlap -- zero-fill |
| 3044 | * from the overlap to the end of the request. |
| 3045 | */ |
| 3046 | if (!*result) { |
| 3047 | u32 obj_overlap = rbd_obj_img_extents_bytes(obj_req); |
| 3048 | |
| 3049 | if (obj_overlap < obj_req->ex.oe_len) |
| 3050 | rbd_obj_zero_range(obj_req, obj_overlap, |
| 3051 | obj_req->ex.oe_len - obj_overlap); |
| 3052 | } |
| 3053 | return true; |
| 3054 | default: |
| 3055 | BUG(); |
| 3056 | } |
| 3057 | } |
| 3058 | |
| 3059 | static bool rbd_obj_write_is_noop(struct rbd_obj_request *obj_req) |
| 3060 | { |
| 3061 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3062 | |
| 3063 | if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) |
| 3064 | obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; |
| 3065 | |
| 3066 | if (!(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST) && |
| 3067 | (obj_req->flags & RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT)) { |
| 3068 | dout("%s %p noop for nonexistent\n", __func__, obj_req); |
| 3069 | return true; |
| 3070 | } |
| 3071 | |
| 3072 | return false; |
| 3073 | } |
| 3074 | |
| 3075 | /* |
| 3076 | * Return: |
| 3077 | * 0 - object map update sent |
| 3078 | * 1 - object map update isn't needed |
| 3079 | * <0 - error |
| 3080 | */ |
| 3081 | static int rbd_obj_write_pre_object_map(struct rbd_obj_request *obj_req) |
| 3082 | { |
| 3083 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3084 | u8 new_state; |
| 3085 | |
| 3086 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
| 3087 | return 1; |
| 3088 | |
| 3089 | if (obj_req->flags & RBD_OBJ_FLAG_DELETION) |
| 3090 | new_state = OBJECT_PENDING; |
| 3091 | else |
| 3092 | new_state = OBJECT_EXISTS; |
| 3093 | |
| 3094 | return rbd_object_map_update(obj_req, CEPH_NOSNAP, new_state, NULL); |
| 3095 | } |
| 3096 | |
| 3097 | static int rbd_obj_write_object(struct rbd_obj_request *obj_req) |
| 3098 | { |
| 3099 | struct ceph_osd_request *osd_req; |
| 3100 | int num_ops = count_write_ops(obj_req); |
| 3101 | int which = 0; |
| 3102 | int ret; |
| 3103 | |
| 3104 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) |
| 3105 | num_ops++; /* stat */ |
| 3106 | |
| 3107 | osd_req = rbd_obj_add_osd_request(obj_req, num_ops); |
| 3108 | if (IS_ERR(osd_req)) |
| 3109 | return PTR_ERR(osd_req); |
| 3110 | |
| 3111 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { |
| 3112 | ret = rbd_osd_setup_stat(osd_req, which++); |
| 3113 | if (ret) |
| 3114 | return ret; |
| 3115 | } |
| 3116 | |
| 3117 | rbd_osd_setup_write_ops(osd_req, which); |
| 3118 | rbd_osd_format_write(osd_req); |
| 3119 | |
| 3120 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
| 3121 | if (ret) |
| 3122 | return ret; |
| 3123 | |
| 3124 | rbd_osd_submit(osd_req); |
| 3125 | return 0; |
| 3126 | } |
| 3127 | |
| 3128 | /* |
| 3129 | * copyup_bvecs pages are never highmem pages |
| 3130 | */ |
| 3131 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) |
| 3132 | { |
| 3133 | struct ceph_bvec_iter it = { |
| 3134 | .bvecs = bvecs, |
| 3135 | .iter = { .bi_size = bytes }, |
| 3136 | }; |
| 3137 | |
| 3138 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
| 3139 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, |
| 3140 | bv.bv_len)) |
| 3141 | return false; |
| 3142 | })); |
| 3143 | return true; |
| 3144 | } |
| 3145 | |
| 3146 | #define MODS_ONLY U32_MAX |
| 3147 | |
| 3148 | static int rbd_obj_copyup_empty_snapc(struct rbd_obj_request *obj_req, |
| 3149 | u32 bytes) |
| 3150 | { |
| 3151 | struct ceph_osd_request *osd_req; |
| 3152 | int ret; |
| 3153 | |
| 3154 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
| 3155 | rbd_assert(bytes > 0 && bytes != MODS_ONLY); |
| 3156 | |
| 3157 | osd_req = __rbd_obj_add_osd_request(obj_req, &rbd_empty_snapc, 1); |
| 3158 | if (IS_ERR(osd_req)) |
| 3159 | return PTR_ERR(osd_req); |
| 3160 | |
| 3161 | ret = rbd_osd_setup_copyup(osd_req, 0, bytes); |
| 3162 | if (ret) |
| 3163 | return ret; |
| 3164 | |
| 3165 | rbd_osd_format_write(osd_req); |
| 3166 | |
| 3167 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
| 3168 | if (ret) |
| 3169 | return ret; |
| 3170 | |
| 3171 | rbd_osd_submit(osd_req); |
| 3172 | return 0; |
| 3173 | } |
| 3174 | |
| 3175 | static int rbd_obj_copyup_current_snapc(struct rbd_obj_request *obj_req, |
| 3176 | u32 bytes) |
| 3177 | { |
| 3178 | struct ceph_osd_request *osd_req; |
| 3179 | int num_ops = count_write_ops(obj_req); |
| 3180 | int which = 0; |
| 3181 | int ret; |
| 3182 | |
| 3183 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
| 3184 | |
| 3185 | if (bytes != MODS_ONLY) |
| 3186 | num_ops++; /* copyup */ |
| 3187 | |
| 3188 | osd_req = rbd_obj_add_osd_request(obj_req, num_ops); |
| 3189 | if (IS_ERR(osd_req)) |
| 3190 | return PTR_ERR(osd_req); |
| 3191 | |
| 3192 | if (bytes != MODS_ONLY) { |
| 3193 | ret = rbd_osd_setup_copyup(osd_req, which++, bytes); |
| 3194 | if (ret) |
| 3195 | return ret; |
| 3196 | } |
| 3197 | |
| 3198 | rbd_osd_setup_write_ops(osd_req, which); |
| 3199 | rbd_osd_format_write(osd_req); |
| 3200 | |
| 3201 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
| 3202 | if (ret) |
| 3203 | return ret; |
| 3204 | |
| 3205 | rbd_osd_submit(osd_req); |
| 3206 | return 0; |
| 3207 | } |
| 3208 | |
| 3209 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
| 3210 | { |
| 3211 | u32 i; |
| 3212 | |
| 3213 | rbd_assert(!obj_req->copyup_bvecs); |
| 3214 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); |
| 3215 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, |
| 3216 | sizeof(*obj_req->copyup_bvecs), |
| 3217 | GFP_NOIO); |
| 3218 | if (!obj_req->copyup_bvecs) |
| 3219 | return -ENOMEM; |
| 3220 | |
| 3221 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
| 3222 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); |
| 3223 | |
| 3224 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); |
| 3225 | if (!obj_req->copyup_bvecs[i].bv_page) |
| 3226 | return -ENOMEM; |
| 3227 | |
| 3228 | obj_req->copyup_bvecs[i].bv_offset = 0; |
| 3229 | obj_req->copyup_bvecs[i].bv_len = len; |
| 3230 | obj_overlap -= len; |
| 3231 | } |
| 3232 | |
| 3233 | rbd_assert(!obj_overlap); |
| 3234 | return 0; |
| 3235 | } |
| 3236 | |
| 3237 | /* |
| 3238 | * The target object doesn't exist. Read the data for the entire |
| 3239 | * target object up to the overlap point (if any) from the parent, |
| 3240 | * so we can use it for a copyup. |
| 3241 | */ |
| 3242 | static int rbd_obj_copyup_read_parent(struct rbd_obj_request *obj_req) |
| 3243 | { |
| 3244 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3245 | int ret; |
| 3246 | |
| 3247 | rbd_assert(obj_req->num_img_extents); |
| 3248 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
| 3249 | rbd_dev->parent_overlap); |
| 3250 | if (!obj_req->num_img_extents) { |
| 3251 | /* |
| 3252 | * The overlap has become 0 (most likely because the |
| 3253 | * image has been flattened). Re-submit the original write |
| 3254 | * request -- pass MODS_ONLY since the copyup isn't needed |
| 3255 | * anymore. |
| 3256 | */ |
| 3257 | return rbd_obj_copyup_current_snapc(obj_req, MODS_ONLY); |
| 3258 | } |
| 3259 | |
| 3260 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
| 3261 | if (ret) |
| 3262 | return ret; |
| 3263 | |
| 3264 | return rbd_obj_read_from_parent(obj_req); |
| 3265 | } |
| 3266 | |
| 3267 | static void rbd_obj_copyup_object_maps(struct rbd_obj_request *obj_req) |
| 3268 | { |
| 3269 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3270 | struct ceph_snap_context *snapc = obj_req->img_request->snapc; |
| 3271 | u8 new_state; |
| 3272 | u32 i; |
| 3273 | int ret; |
| 3274 | |
| 3275 | rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); |
| 3276 | |
| 3277 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
| 3278 | return; |
| 3279 | |
| 3280 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) |
| 3281 | return; |
| 3282 | |
| 3283 | for (i = 0; i < snapc->num_snaps; i++) { |
| 3284 | if ((rbd_dev->header.features & RBD_FEATURE_FAST_DIFF) && |
| 3285 | i + 1 < snapc->num_snaps) |
| 3286 | new_state = OBJECT_EXISTS_CLEAN; |
| 3287 | else |
| 3288 | new_state = OBJECT_EXISTS; |
| 3289 | |
| 3290 | ret = rbd_object_map_update(obj_req, snapc->snaps[i], |
| 3291 | new_state, NULL); |
| 3292 | if (ret < 0) { |
| 3293 | obj_req->pending.result = ret; |
| 3294 | return; |
| 3295 | } |
| 3296 | |
| 3297 | rbd_assert(!ret); |
| 3298 | obj_req->pending.num_pending++; |
| 3299 | } |
| 3300 | } |
| 3301 | |
| 3302 | static void rbd_obj_copyup_write_object(struct rbd_obj_request *obj_req) |
| 3303 | { |
| 3304 | u32 bytes = rbd_obj_img_extents_bytes(obj_req); |
| 3305 | int ret; |
| 3306 | |
| 3307 | rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); |
| 3308 | |
| 3309 | /* |
| 3310 | * Only send non-zero copyup data to save some I/O and network |
| 3311 | * bandwidth -- zero copyup data is equivalent to the object not |
| 3312 | * existing. |
| 3313 | */ |
| 3314 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) |
| 3315 | bytes = 0; |
| 3316 | |
| 3317 | if (obj_req->img_request->snapc->num_snaps && bytes > 0) { |
| 3318 | /* |
| 3319 | * Send a copyup request with an empty snapshot context to |
| 3320 | * deep-copyup the object through all existing snapshots. |
| 3321 | * A second request with the current snapshot context will be |
| 3322 | * sent for the actual modification. |
| 3323 | */ |
| 3324 | ret = rbd_obj_copyup_empty_snapc(obj_req, bytes); |
| 3325 | if (ret) { |
| 3326 | obj_req->pending.result = ret; |
| 3327 | return; |
| 3328 | } |
| 3329 | |
| 3330 | obj_req->pending.num_pending++; |
| 3331 | bytes = MODS_ONLY; |
| 3332 | } |
| 3333 | |
| 3334 | ret = rbd_obj_copyup_current_snapc(obj_req, bytes); |
| 3335 | if (ret) { |
| 3336 | obj_req->pending.result = ret; |
| 3337 | return; |
| 3338 | } |
| 3339 | |
| 3340 | obj_req->pending.num_pending++; |
| 3341 | } |
| 3342 | |
| 3343 | static bool rbd_obj_advance_copyup(struct rbd_obj_request *obj_req, int *result) |
| 3344 | { |
| 3345 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3346 | int ret; |
| 3347 | |
| 3348 | again: |
| 3349 | switch (obj_req->copyup_state) { |
| 3350 | case RBD_OBJ_COPYUP_START: |
| 3351 | rbd_assert(!*result); |
| 3352 | |
| 3353 | ret = rbd_obj_copyup_read_parent(obj_req); |
| 3354 | if (ret) { |
| 3355 | *result = ret; |
| 3356 | return true; |
| 3357 | } |
| 3358 | if (obj_req->num_img_extents) |
| 3359 | obj_req->copyup_state = RBD_OBJ_COPYUP_READ_PARENT; |
| 3360 | else |
| 3361 | obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; |
| 3362 | return false; |
| 3363 | case RBD_OBJ_COPYUP_READ_PARENT: |
| 3364 | if (*result) |
| 3365 | return true; |
| 3366 | |
| 3367 | if (is_zero_bvecs(obj_req->copyup_bvecs, |
| 3368 | rbd_obj_img_extents_bytes(obj_req))) { |
| 3369 | dout("%s %p detected zeros\n", __func__, obj_req); |
| 3370 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ZEROS; |
| 3371 | } |
| 3372 | |
| 3373 | rbd_obj_copyup_object_maps(obj_req); |
| 3374 | if (!obj_req->pending.num_pending) { |
| 3375 | *result = obj_req->pending.result; |
| 3376 | obj_req->copyup_state = RBD_OBJ_COPYUP_OBJECT_MAPS; |
| 3377 | goto again; |
| 3378 | } |
| 3379 | obj_req->copyup_state = __RBD_OBJ_COPYUP_OBJECT_MAPS; |
| 3380 | return false; |
| 3381 | case __RBD_OBJ_COPYUP_OBJECT_MAPS: |
| 3382 | if (!pending_result_dec(&obj_req->pending, result)) |
| 3383 | return false; |
| 3384 | /* fall through */ |
| 3385 | case RBD_OBJ_COPYUP_OBJECT_MAPS: |
| 3386 | if (*result) { |
| 3387 | rbd_warn(rbd_dev, "snap object map update failed: %d", |
| 3388 | *result); |
| 3389 | return true; |
| 3390 | } |
| 3391 | |
| 3392 | rbd_obj_copyup_write_object(obj_req); |
| 3393 | if (!obj_req->pending.num_pending) { |
| 3394 | *result = obj_req->pending.result; |
| 3395 | obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; |
| 3396 | goto again; |
| 3397 | } |
| 3398 | obj_req->copyup_state = __RBD_OBJ_COPYUP_WRITE_OBJECT; |
| 3399 | return false; |
| 3400 | case __RBD_OBJ_COPYUP_WRITE_OBJECT: |
| 3401 | if (!pending_result_dec(&obj_req->pending, result)) |
| 3402 | return false; |
| 3403 | /* fall through */ |
| 3404 | case RBD_OBJ_COPYUP_WRITE_OBJECT: |
| 3405 | return true; |
| 3406 | default: |
| 3407 | BUG(); |
| 3408 | } |
| 3409 | } |
| 3410 | |
| 3411 | /* |
| 3412 | * Return: |
| 3413 | * 0 - object map update sent |
| 3414 | * 1 - object map update isn't needed |
| 3415 | * <0 - error |
| 3416 | */ |
| 3417 | static int rbd_obj_write_post_object_map(struct rbd_obj_request *obj_req) |
| 3418 | { |
| 3419 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3420 | u8 current_state = OBJECT_PENDING; |
| 3421 | |
| 3422 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
| 3423 | return 1; |
| 3424 | |
| 3425 | if (!(obj_req->flags & RBD_OBJ_FLAG_DELETION)) |
| 3426 | return 1; |
| 3427 | |
| 3428 | return rbd_object_map_update(obj_req, CEPH_NOSNAP, OBJECT_NONEXISTENT, |
| 3429 | ¤t_state); |
| 3430 | } |
| 3431 | |
| 3432 | static bool rbd_obj_advance_write(struct rbd_obj_request *obj_req, int *result) |
| 3433 | { |
| 3434 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
| 3435 | int ret; |
| 3436 | |
| 3437 | again: |
| 3438 | switch (obj_req->write_state) { |
| 3439 | case RBD_OBJ_WRITE_START: |
| 3440 | rbd_assert(!*result); |
| 3441 | |
| 3442 | if (rbd_obj_write_is_noop(obj_req)) |
| 3443 | return true; |
| 3444 | |
| 3445 | ret = rbd_obj_write_pre_object_map(obj_req); |
| 3446 | if (ret < 0) { |
| 3447 | *result = ret; |
| 3448 | return true; |
| 3449 | } |
| 3450 | obj_req->write_state = RBD_OBJ_WRITE_PRE_OBJECT_MAP; |
| 3451 | if (ret > 0) |
| 3452 | goto again; |
| 3453 | return false; |
| 3454 | case RBD_OBJ_WRITE_PRE_OBJECT_MAP: |
| 3455 | if (*result) { |
| 3456 | rbd_warn(rbd_dev, "pre object map update failed: %d", |
| 3457 | *result); |
| 3458 | return true; |
| 3459 | } |
| 3460 | ret = rbd_obj_write_object(obj_req); |
| 3461 | if (ret) { |
| 3462 | *result = ret; |
| 3463 | return true; |
| 3464 | } |
| 3465 | obj_req->write_state = RBD_OBJ_WRITE_OBJECT; |
| 3466 | return false; |
| 3467 | case RBD_OBJ_WRITE_OBJECT: |
| 3468 | if (*result == -ENOENT) { |
| 3469 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { |
| 3470 | *result = 0; |
| 3471 | obj_req->copyup_state = RBD_OBJ_COPYUP_START; |
| 3472 | obj_req->write_state = __RBD_OBJ_WRITE_COPYUP; |
| 3473 | goto again; |
| 3474 | } |
| 3475 | /* |
| 3476 | * On a non-existent object: |
| 3477 | * delete - -ENOENT, truncate/zero - 0 |
| 3478 | */ |
| 3479 | if (obj_req->flags & RBD_OBJ_FLAG_DELETION) |
| 3480 | *result = 0; |
| 3481 | } |
| 3482 | if (*result) |
| 3483 | return true; |
| 3484 | |
| 3485 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; |
| 3486 | goto again; |
| 3487 | case __RBD_OBJ_WRITE_COPYUP: |
| 3488 | if (!rbd_obj_advance_copyup(obj_req, result)) |
| 3489 | return false; |
| 3490 | /* fall through */ |
| 3491 | case RBD_OBJ_WRITE_COPYUP: |
| 3492 | if (*result) { |
| 3493 | rbd_warn(rbd_dev, "copyup failed: %d", *result); |
| 3494 | return true; |
| 3495 | } |
| 3496 | ret = rbd_obj_write_post_object_map(obj_req); |
| 3497 | if (ret < 0) { |
| 3498 | *result = ret; |
| 3499 | return true; |
| 3500 | } |
| 3501 | obj_req->write_state = RBD_OBJ_WRITE_POST_OBJECT_MAP; |
| 3502 | if (ret > 0) |
| 3503 | goto again; |
| 3504 | return false; |
| 3505 | case RBD_OBJ_WRITE_POST_OBJECT_MAP: |
| 3506 | if (*result) |
| 3507 | rbd_warn(rbd_dev, "post object map update failed: %d", |
| 3508 | *result); |
| 3509 | return true; |
| 3510 | default: |
| 3511 | BUG(); |
| 3512 | } |
| 3513 | } |
| 3514 | |
| 3515 | /* |
| 3516 | * Return true if @obj_req is completed. |
| 3517 | */ |
| 3518 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req, |
| 3519 | int *result) |
| 3520 | { |
| 3521 | struct rbd_img_request *img_req = obj_req->img_request; |
| 3522 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3523 | bool done; |
| 3524 | |
| 3525 | mutex_lock(&obj_req->state_mutex); |
| 3526 | if (!rbd_img_is_write(img_req)) |
| 3527 | done = rbd_obj_advance_read(obj_req, result); |
| 3528 | else |
| 3529 | done = rbd_obj_advance_write(obj_req, result); |
| 3530 | mutex_unlock(&obj_req->state_mutex); |
| 3531 | |
| 3532 | if (done && *result) { |
| 3533 | rbd_assert(*result < 0); |
| 3534 | rbd_warn(rbd_dev, "%s at objno %llu %llu~%llu result %d", |
| 3535 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
| 3536 | obj_req->ex.oe_off, obj_req->ex.oe_len, *result); |
| 3537 | } |
| 3538 | return done; |
| 3539 | } |
| 3540 | |
| 3541 | /* |
| 3542 | * This is open-coded in rbd_img_handle_request() to avoid parent chain |
| 3543 | * recursion. |
| 3544 | */ |
| 3545 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result) |
| 3546 | { |
| 3547 | if (__rbd_obj_handle_request(obj_req, &result)) |
| 3548 | rbd_img_handle_request(obj_req->img_request, result); |
| 3549 | } |
| 3550 | |
| 3551 | static bool need_exclusive_lock(struct rbd_img_request *img_req) |
| 3552 | { |
| 3553 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3554 | |
| 3555 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) |
| 3556 | return false; |
| 3557 | |
| 3558 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| 3559 | return false; |
| 3560 | |
| 3561 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); |
| 3562 | if (rbd_dev->opts->lock_on_read || |
| 3563 | (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) |
| 3564 | return true; |
| 3565 | |
| 3566 | return rbd_img_is_write(img_req); |
| 3567 | } |
| 3568 | |
| 3569 | static bool rbd_lock_add_request(struct rbd_img_request *img_req) |
| 3570 | { |
| 3571 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3572 | bool locked; |
| 3573 | |
| 3574 | lockdep_assert_held(&rbd_dev->lock_rwsem); |
| 3575 | locked = rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED; |
| 3576 | spin_lock(&rbd_dev->lock_lists_lock); |
| 3577 | rbd_assert(list_empty(&img_req->lock_item)); |
| 3578 | if (!locked) |
| 3579 | list_add_tail(&img_req->lock_item, &rbd_dev->acquiring_list); |
| 3580 | else |
| 3581 | list_add_tail(&img_req->lock_item, &rbd_dev->running_list); |
| 3582 | spin_unlock(&rbd_dev->lock_lists_lock); |
| 3583 | return locked; |
| 3584 | } |
| 3585 | |
| 3586 | static void rbd_lock_del_request(struct rbd_img_request *img_req) |
| 3587 | { |
| 3588 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3589 | bool need_wakeup; |
| 3590 | |
| 3591 | lockdep_assert_held(&rbd_dev->lock_rwsem); |
| 3592 | spin_lock(&rbd_dev->lock_lists_lock); |
| 3593 | rbd_assert(!list_empty(&img_req->lock_item)); |
| 3594 | list_del_init(&img_req->lock_item); |
| 3595 | need_wakeup = (rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING && |
| 3596 | list_empty(&rbd_dev->running_list)); |
| 3597 | spin_unlock(&rbd_dev->lock_lists_lock); |
| 3598 | if (need_wakeup) |
| 3599 | complete(&rbd_dev->releasing_wait); |
| 3600 | } |
| 3601 | |
| 3602 | static int rbd_img_exclusive_lock(struct rbd_img_request *img_req) |
| 3603 | { |
| 3604 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3605 | |
| 3606 | if (!need_exclusive_lock(img_req)) |
| 3607 | return 1; |
| 3608 | |
| 3609 | if (rbd_lock_add_request(img_req)) |
| 3610 | return 1; |
| 3611 | |
| 3612 | if (rbd_dev->opts->exclusive) { |
| 3613 | WARN_ON(1); /* lock got released? */ |
| 3614 | return -EROFS; |
| 3615 | } |
| 3616 | |
| 3617 | /* |
| 3618 | * Note the use of mod_delayed_work() in rbd_acquire_lock() |
| 3619 | * and cancel_delayed_work() in wake_lock_waiters(). |
| 3620 | */ |
| 3621 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); |
| 3622 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
| 3623 | return 0; |
| 3624 | } |
| 3625 | |
| 3626 | static void rbd_img_object_requests(struct rbd_img_request *img_req) |
| 3627 | { |
| 3628 | struct rbd_obj_request *obj_req; |
| 3629 | |
| 3630 | rbd_assert(!img_req->pending.result && !img_req->pending.num_pending); |
| 3631 | |
| 3632 | for_each_obj_request(img_req, obj_req) { |
| 3633 | int result = 0; |
| 3634 | |
| 3635 | if (__rbd_obj_handle_request(obj_req, &result)) { |
| 3636 | if (result) { |
| 3637 | img_req->pending.result = result; |
| 3638 | return; |
| 3639 | } |
| 3640 | } else { |
| 3641 | img_req->pending.num_pending++; |
| 3642 | } |
| 3643 | } |
| 3644 | } |
| 3645 | |
| 3646 | static bool rbd_img_advance(struct rbd_img_request *img_req, int *result) |
| 3647 | { |
| 3648 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3649 | int ret; |
| 3650 | |
| 3651 | again: |
| 3652 | switch (img_req->state) { |
| 3653 | case RBD_IMG_START: |
| 3654 | rbd_assert(!*result); |
| 3655 | |
| 3656 | ret = rbd_img_exclusive_lock(img_req); |
| 3657 | if (ret < 0) { |
| 3658 | *result = ret; |
| 3659 | return true; |
| 3660 | } |
| 3661 | img_req->state = RBD_IMG_EXCLUSIVE_LOCK; |
| 3662 | if (ret > 0) |
| 3663 | goto again; |
| 3664 | return false; |
| 3665 | case RBD_IMG_EXCLUSIVE_LOCK: |
| 3666 | if (*result) |
| 3667 | return true; |
| 3668 | |
| 3669 | rbd_assert(!need_exclusive_lock(img_req) || |
| 3670 | __rbd_is_lock_owner(rbd_dev)); |
| 3671 | |
| 3672 | rbd_img_object_requests(img_req); |
| 3673 | if (!img_req->pending.num_pending) { |
| 3674 | *result = img_req->pending.result; |
| 3675 | img_req->state = RBD_IMG_OBJECT_REQUESTS; |
| 3676 | goto again; |
| 3677 | } |
| 3678 | img_req->state = __RBD_IMG_OBJECT_REQUESTS; |
| 3679 | return false; |
| 3680 | case __RBD_IMG_OBJECT_REQUESTS: |
| 3681 | if (!pending_result_dec(&img_req->pending, result)) |
| 3682 | return false; |
| 3683 | /* fall through */ |
| 3684 | case RBD_IMG_OBJECT_REQUESTS: |
| 3685 | return true; |
| 3686 | default: |
| 3687 | BUG(); |
| 3688 | } |
| 3689 | } |
| 3690 | |
| 3691 | /* |
| 3692 | * Return true if @img_req is completed. |
| 3693 | */ |
| 3694 | static bool __rbd_img_handle_request(struct rbd_img_request *img_req, |
| 3695 | int *result) |
| 3696 | { |
| 3697 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
| 3698 | bool done; |
| 3699 | |
| 3700 | if (need_exclusive_lock(img_req)) { |
| 3701 | down_read(&rbd_dev->lock_rwsem); |
| 3702 | mutex_lock(&img_req->state_mutex); |
| 3703 | done = rbd_img_advance(img_req, result); |
| 3704 | if (done) |
| 3705 | rbd_lock_del_request(img_req); |
| 3706 | mutex_unlock(&img_req->state_mutex); |
| 3707 | up_read(&rbd_dev->lock_rwsem); |
| 3708 | } else { |
| 3709 | mutex_lock(&img_req->state_mutex); |
| 3710 | done = rbd_img_advance(img_req, result); |
| 3711 | mutex_unlock(&img_req->state_mutex); |
| 3712 | } |
| 3713 | |
| 3714 | if (done && *result) { |
| 3715 | rbd_assert(*result < 0); |
| 3716 | rbd_warn(rbd_dev, "%s%s result %d", |
| 3717 | test_bit(IMG_REQ_CHILD, &img_req->flags) ? "child " : "", |
| 3718 | obj_op_name(img_req->op_type), *result); |
| 3719 | } |
| 3720 | return done; |
| 3721 | } |
| 3722 | |
| 3723 | static void rbd_img_handle_request(struct rbd_img_request *img_req, int result) |
| 3724 | { |
| 3725 | again: |
| 3726 | if (!__rbd_img_handle_request(img_req, &result)) |
| 3727 | return; |
| 3728 | |
| 3729 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { |
| 3730 | struct rbd_obj_request *obj_req = img_req->obj_request; |
| 3731 | |
| 3732 | rbd_img_request_put(img_req); |
| 3733 | if (__rbd_obj_handle_request(obj_req, &result)) { |
| 3734 | img_req = obj_req->img_request; |
| 3735 | goto again; |
| 3736 | } |
| 3737 | } else { |
| 3738 | struct request *rq = img_req->rq; |
| 3739 | |
| 3740 | rbd_img_request_put(img_req); |
| 3741 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
| 3742 | } |
| 3743 | } |
| 3744 | |
| 3745 | static const struct rbd_client_id rbd_empty_cid; |
| 3746 | |
| 3747 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
| 3748 | const struct rbd_client_id *rhs) |
| 3749 | { |
| 3750 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; |
| 3751 | } |
| 3752 | |
| 3753 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) |
| 3754 | { |
| 3755 | struct rbd_client_id cid; |
| 3756 | |
| 3757 | mutex_lock(&rbd_dev->watch_mutex); |
| 3758 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); |
| 3759 | cid.handle = rbd_dev->watch_cookie; |
| 3760 | mutex_unlock(&rbd_dev->watch_mutex); |
| 3761 | return cid; |
| 3762 | } |
| 3763 | |
| 3764 | /* |
| 3765 | * lock_rwsem must be held for write |
| 3766 | */ |
| 3767 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, |
| 3768 | const struct rbd_client_id *cid) |
| 3769 | { |
| 3770 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, |
| 3771 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, |
| 3772 | cid->gid, cid->handle); |
| 3773 | rbd_dev->owner_cid = *cid; /* struct */ |
| 3774 | } |
| 3775 | |
| 3776 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) |
| 3777 | { |
| 3778 | mutex_lock(&rbd_dev->watch_mutex); |
| 3779 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); |
| 3780 | mutex_unlock(&rbd_dev->watch_mutex); |
| 3781 | } |
| 3782 | |
| 3783 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
| 3784 | { |
| 3785 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
| 3786 | |
| 3787 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
| 3788 | strcpy(rbd_dev->lock_cookie, cookie); |
| 3789 | rbd_set_owner_cid(rbd_dev, &cid); |
| 3790 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); |
| 3791 | } |
| 3792 | |
| 3793 | /* |
| 3794 | * lock_rwsem must be held for write |
| 3795 | */ |
| 3796 | static int rbd_lock(struct rbd_device *rbd_dev) |
| 3797 | { |
| 3798 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 3799 | char cookie[32]; |
| 3800 | int ret; |
| 3801 | |
| 3802 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
| 3803 | rbd_dev->lock_cookie[0] != '\0'); |
| 3804 | |
| 3805 | format_lock_cookie(rbd_dev, cookie); |
| 3806 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| 3807 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, |
| 3808 | RBD_LOCK_TAG, "", 0); |
| 3809 | if (ret) |
| 3810 | return ret; |
| 3811 | |
| 3812 | __rbd_lock(rbd_dev, cookie); |
| 3813 | return 0; |
| 3814 | } |
| 3815 | |
| 3816 | /* |
| 3817 | * lock_rwsem must be held for write |
| 3818 | */ |
| 3819 | static void rbd_unlock(struct rbd_device *rbd_dev) |
| 3820 | { |
| 3821 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 3822 | int ret; |
| 3823 | |
| 3824 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
| 3825 | rbd_dev->lock_cookie[0] == '\0'); |
| 3826 | |
| 3827 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| 3828 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
| 3829 | if (ret && ret != -ENOENT) |
| 3830 | rbd_warn(rbd_dev, "failed to unlock header: %d", ret); |
| 3831 | |
| 3832 | /* treat errors as the image is unlocked */ |
| 3833 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
| 3834 | rbd_dev->lock_cookie[0] = '\0'; |
| 3835 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| 3836 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); |
| 3837 | } |
| 3838 | |
| 3839 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
| 3840 | enum rbd_notify_op notify_op, |
| 3841 | struct page ***preply_pages, |
| 3842 | size_t *preply_len) |
| 3843 | { |
| 3844 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 3845 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
| 3846 | char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
| 3847 | int buf_size = sizeof(buf); |
| 3848 | void *p = buf; |
| 3849 | |
| 3850 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
| 3851 | |
| 3852 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
| 3853 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); |
| 3854 | ceph_encode_32(&p, notify_op); |
| 3855 | ceph_encode_64(&p, cid.gid); |
| 3856 | ceph_encode_64(&p, cid.handle); |
| 3857 | |
| 3858 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
| 3859 | &rbd_dev->header_oloc, buf, buf_size, |
| 3860 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); |
| 3861 | } |
| 3862 | |
| 3863 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
| 3864 | enum rbd_notify_op notify_op) |
| 3865 | { |
| 3866 | struct page **reply_pages; |
| 3867 | size_t reply_len; |
| 3868 | |
| 3869 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
| 3870 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); |
| 3871 | } |
| 3872 | |
| 3873 | static void rbd_notify_acquired_lock(struct work_struct *work) |
| 3874 | { |
| 3875 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| 3876 | acquired_lock_work); |
| 3877 | |
| 3878 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
| 3879 | } |
| 3880 | |
| 3881 | static void rbd_notify_released_lock(struct work_struct *work) |
| 3882 | { |
| 3883 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| 3884 | released_lock_work); |
| 3885 | |
| 3886 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
| 3887 | } |
| 3888 | |
| 3889 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
| 3890 | { |
| 3891 | struct page **reply_pages; |
| 3892 | size_t reply_len; |
| 3893 | bool lock_owner_responded = false; |
| 3894 | int ret; |
| 3895 | |
| 3896 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 3897 | |
| 3898 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
| 3899 | &reply_pages, &reply_len); |
| 3900 | if (ret && ret != -ETIMEDOUT) { |
| 3901 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); |
| 3902 | goto out; |
| 3903 | } |
| 3904 | |
| 3905 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
| 3906 | void *p = page_address(reply_pages[0]); |
| 3907 | void *const end = p + reply_len; |
| 3908 | u32 n; |
| 3909 | |
| 3910 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
| 3911 | while (n--) { |
| 3912 | u8 struct_v; |
| 3913 | u32 len; |
| 3914 | |
| 3915 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
| 3916 | p += 8 + 8; /* skip gid and cookie */ |
| 3917 | |
| 3918 | ceph_decode_32_safe(&p, end, len, e_inval); |
| 3919 | if (!len) |
| 3920 | continue; |
| 3921 | |
| 3922 | if (lock_owner_responded) { |
| 3923 | rbd_warn(rbd_dev, |
| 3924 | "duplicate lock owners detected"); |
| 3925 | ret = -EIO; |
| 3926 | goto out; |
| 3927 | } |
| 3928 | |
| 3929 | lock_owner_responded = true; |
| 3930 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", |
| 3931 | &struct_v, &len); |
| 3932 | if (ret) { |
| 3933 | rbd_warn(rbd_dev, |
| 3934 | "failed to decode ResponseMessage: %d", |
| 3935 | ret); |
| 3936 | goto e_inval; |
| 3937 | } |
| 3938 | |
| 3939 | ret = ceph_decode_32(&p); |
| 3940 | } |
| 3941 | } |
| 3942 | |
| 3943 | if (!lock_owner_responded) { |
| 3944 | rbd_warn(rbd_dev, "no lock owners detected"); |
| 3945 | ret = -ETIMEDOUT; |
| 3946 | } |
| 3947 | |
| 3948 | out: |
| 3949 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); |
| 3950 | return ret; |
| 3951 | |
| 3952 | e_inval: |
| 3953 | ret = -EINVAL; |
| 3954 | goto out; |
| 3955 | } |
| 3956 | |
| 3957 | /* |
| 3958 | * Either image request state machine(s) or rbd_add_acquire_lock() |
| 3959 | * (i.e. "rbd map"). |
| 3960 | */ |
| 3961 | static void wake_lock_waiters(struct rbd_device *rbd_dev, int result) |
| 3962 | { |
| 3963 | struct rbd_img_request *img_req; |
| 3964 | |
| 3965 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); |
| 3966 | lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
| 3967 | |
| 3968 | cancel_delayed_work(&rbd_dev->lock_dwork); |
| 3969 | if (!completion_done(&rbd_dev->acquire_wait)) { |
| 3970 | rbd_assert(list_empty(&rbd_dev->acquiring_list) && |
| 3971 | list_empty(&rbd_dev->running_list)); |
| 3972 | rbd_dev->acquire_err = result; |
| 3973 | complete_all(&rbd_dev->acquire_wait); |
| 3974 | return; |
| 3975 | } |
| 3976 | |
| 3977 | list_for_each_entry(img_req, &rbd_dev->acquiring_list, lock_item) { |
| 3978 | mutex_lock(&img_req->state_mutex); |
| 3979 | rbd_assert(img_req->state == RBD_IMG_EXCLUSIVE_LOCK); |
| 3980 | rbd_img_schedule(img_req, result); |
| 3981 | mutex_unlock(&img_req->state_mutex); |
| 3982 | } |
| 3983 | |
| 3984 | list_splice_tail_init(&rbd_dev->acquiring_list, &rbd_dev->running_list); |
| 3985 | } |
| 3986 | |
| 3987 | static int get_lock_owner_info(struct rbd_device *rbd_dev, |
| 3988 | struct ceph_locker **lockers, u32 *num_lockers) |
| 3989 | { |
| 3990 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 3991 | u8 lock_type; |
| 3992 | char *lock_tag; |
| 3993 | int ret; |
| 3994 | |
| 3995 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 3996 | |
| 3997 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, |
| 3998 | &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| 3999 | &lock_type, &lock_tag, lockers, num_lockers); |
| 4000 | if (ret) |
| 4001 | return ret; |
| 4002 | |
| 4003 | if (*num_lockers == 0) { |
| 4004 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); |
| 4005 | goto out; |
| 4006 | } |
| 4007 | |
| 4008 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { |
| 4009 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", |
| 4010 | lock_tag); |
| 4011 | ret = -EBUSY; |
| 4012 | goto out; |
| 4013 | } |
| 4014 | |
| 4015 | if (lock_type == CEPH_CLS_LOCK_SHARED) { |
| 4016 | rbd_warn(rbd_dev, "shared lock type detected"); |
| 4017 | ret = -EBUSY; |
| 4018 | goto out; |
| 4019 | } |
| 4020 | |
| 4021 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, |
| 4022 | strlen(RBD_LOCK_COOKIE_PREFIX))) { |
| 4023 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", |
| 4024 | (*lockers)[0].id.cookie); |
| 4025 | ret = -EBUSY; |
| 4026 | goto out; |
| 4027 | } |
| 4028 | |
| 4029 | out: |
| 4030 | kfree(lock_tag); |
| 4031 | return ret; |
| 4032 | } |
| 4033 | |
| 4034 | static int find_watcher(struct rbd_device *rbd_dev, |
| 4035 | const struct ceph_locker *locker) |
| 4036 | { |
| 4037 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4038 | struct ceph_watch_item *watchers; |
| 4039 | u32 num_watchers; |
| 4040 | u64 cookie; |
| 4041 | int i; |
| 4042 | int ret; |
| 4043 | |
| 4044 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, |
| 4045 | &rbd_dev->header_oloc, &watchers, |
| 4046 | &num_watchers); |
| 4047 | if (ret) |
| 4048 | return ret; |
| 4049 | |
| 4050 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); |
| 4051 | for (i = 0; i < num_watchers; i++) { |
| 4052 | if (!memcmp(&watchers[i].addr, &locker->info.addr, |
| 4053 | sizeof(locker->info.addr)) && |
| 4054 | watchers[i].cookie == cookie) { |
| 4055 | struct rbd_client_id cid = { |
| 4056 | .gid = le64_to_cpu(watchers[i].name.num), |
| 4057 | .handle = cookie, |
| 4058 | }; |
| 4059 | |
| 4060 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, |
| 4061 | rbd_dev, cid.gid, cid.handle); |
| 4062 | rbd_set_owner_cid(rbd_dev, &cid); |
| 4063 | ret = 1; |
| 4064 | goto out; |
| 4065 | } |
| 4066 | } |
| 4067 | |
| 4068 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); |
| 4069 | ret = 0; |
| 4070 | out: |
| 4071 | kfree(watchers); |
| 4072 | return ret; |
| 4073 | } |
| 4074 | |
| 4075 | /* |
| 4076 | * lock_rwsem must be held for write |
| 4077 | */ |
| 4078 | static int rbd_try_lock(struct rbd_device *rbd_dev) |
| 4079 | { |
| 4080 | struct ceph_client *client = rbd_dev->rbd_client->client; |
| 4081 | struct ceph_locker *lockers; |
| 4082 | u32 num_lockers; |
| 4083 | int ret; |
| 4084 | |
| 4085 | for (;;) { |
| 4086 | ret = rbd_lock(rbd_dev); |
| 4087 | if (ret != -EBUSY) |
| 4088 | return ret; |
| 4089 | |
| 4090 | /* determine if the current lock holder is still alive */ |
| 4091 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); |
| 4092 | if (ret) |
| 4093 | return ret; |
| 4094 | |
| 4095 | if (num_lockers == 0) |
| 4096 | goto again; |
| 4097 | |
| 4098 | ret = find_watcher(rbd_dev, lockers); |
| 4099 | if (ret) |
| 4100 | goto out; /* request lock or error */ |
| 4101 | |
| 4102 | rbd_warn(rbd_dev, "breaking header lock owned by %s%llu", |
| 4103 | ENTITY_NAME(lockers[0].id.name)); |
| 4104 | |
| 4105 | ret = ceph_monc_blacklist_add(&client->monc, |
| 4106 | &lockers[0].info.addr); |
| 4107 | if (ret) { |
| 4108 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", |
| 4109 | ENTITY_NAME(lockers[0].id.name), ret); |
| 4110 | goto out; |
| 4111 | } |
| 4112 | |
| 4113 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, |
| 4114 | &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| 4115 | lockers[0].id.cookie, |
| 4116 | &lockers[0].id.name); |
| 4117 | if (ret && ret != -ENOENT) |
| 4118 | goto out; |
| 4119 | |
| 4120 | again: |
| 4121 | ceph_free_lockers(lockers, num_lockers); |
| 4122 | } |
| 4123 | |
| 4124 | out: |
| 4125 | ceph_free_lockers(lockers, num_lockers); |
| 4126 | return ret; |
| 4127 | } |
| 4128 | |
| 4129 | static int rbd_post_acquire_action(struct rbd_device *rbd_dev) |
| 4130 | { |
| 4131 | int ret; |
| 4132 | |
| 4133 | if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) { |
| 4134 | ret = rbd_object_map_open(rbd_dev); |
| 4135 | if (ret) |
| 4136 | return ret; |
| 4137 | } |
| 4138 | |
| 4139 | return 0; |
| 4140 | } |
| 4141 | |
| 4142 | /* |
| 4143 | * Return: |
| 4144 | * 0 - lock acquired |
| 4145 | * 1 - caller should call rbd_request_lock() |
| 4146 | * <0 - error |
| 4147 | */ |
| 4148 | static int rbd_try_acquire_lock(struct rbd_device *rbd_dev) |
| 4149 | { |
| 4150 | int ret; |
| 4151 | |
| 4152 | down_read(&rbd_dev->lock_rwsem); |
| 4153 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, |
| 4154 | rbd_dev->lock_state); |
| 4155 | if (__rbd_is_lock_owner(rbd_dev)) { |
| 4156 | up_read(&rbd_dev->lock_rwsem); |
| 4157 | return 0; |
| 4158 | } |
| 4159 | |
| 4160 | up_read(&rbd_dev->lock_rwsem); |
| 4161 | down_write(&rbd_dev->lock_rwsem); |
| 4162 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, |
| 4163 | rbd_dev->lock_state); |
| 4164 | if (__rbd_is_lock_owner(rbd_dev)) { |
| 4165 | up_write(&rbd_dev->lock_rwsem); |
| 4166 | return 0; |
| 4167 | } |
| 4168 | |
| 4169 | ret = rbd_try_lock(rbd_dev); |
| 4170 | if (ret < 0) { |
| 4171 | rbd_warn(rbd_dev, "failed to lock header: %d", ret); |
| 4172 | if (ret == -EBLACKLISTED) |
| 4173 | goto out; |
| 4174 | |
| 4175 | ret = 1; /* request lock anyway */ |
| 4176 | } |
| 4177 | if (ret > 0) { |
| 4178 | up_write(&rbd_dev->lock_rwsem); |
| 4179 | return ret; |
| 4180 | } |
| 4181 | |
| 4182 | rbd_assert(rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED); |
| 4183 | rbd_assert(list_empty(&rbd_dev->running_list)); |
| 4184 | |
| 4185 | ret = rbd_post_acquire_action(rbd_dev); |
| 4186 | if (ret) { |
| 4187 | rbd_warn(rbd_dev, "post-acquire action failed: %d", ret); |
| 4188 | /* |
| 4189 | * Can't stay in RBD_LOCK_STATE_LOCKED because |
| 4190 | * rbd_lock_add_request() would let the request through, |
| 4191 | * assuming that e.g. object map is locked and loaded. |
| 4192 | */ |
| 4193 | rbd_unlock(rbd_dev); |
| 4194 | } |
| 4195 | |
| 4196 | out: |
| 4197 | wake_lock_waiters(rbd_dev, ret); |
| 4198 | up_write(&rbd_dev->lock_rwsem); |
| 4199 | return ret; |
| 4200 | } |
| 4201 | |
| 4202 | static void rbd_acquire_lock(struct work_struct *work) |
| 4203 | { |
| 4204 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
| 4205 | struct rbd_device, lock_dwork); |
| 4206 | int ret; |
| 4207 | |
| 4208 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4209 | again: |
| 4210 | ret = rbd_try_acquire_lock(rbd_dev); |
| 4211 | if (ret <= 0) { |
| 4212 | dout("%s rbd_dev %p ret %d - done\n", __func__, rbd_dev, ret); |
| 4213 | return; |
| 4214 | } |
| 4215 | |
| 4216 | ret = rbd_request_lock(rbd_dev); |
| 4217 | if (ret == -ETIMEDOUT) { |
| 4218 | goto again; /* treat this as a dead client */ |
| 4219 | } else if (ret == -EROFS) { |
| 4220 | rbd_warn(rbd_dev, "peer will not release lock"); |
| 4221 | down_write(&rbd_dev->lock_rwsem); |
| 4222 | wake_lock_waiters(rbd_dev, ret); |
| 4223 | up_write(&rbd_dev->lock_rwsem); |
| 4224 | } else if (ret < 0) { |
| 4225 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); |
| 4226 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
| 4227 | RBD_RETRY_DELAY); |
| 4228 | } else { |
| 4229 | /* |
| 4230 | * lock owner acked, but resend if we don't see them |
| 4231 | * release the lock |
| 4232 | */ |
| 4233 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, |
| 4234 | rbd_dev); |
| 4235 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
| 4236 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); |
| 4237 | } |
| 4238 | } |
| 4239 | |
| 4240 | static bool rbd_quiesce_lock(struct rbd_device *rbd_dev) |
| 4241 | { |
| 4242 | bool need_wait; |
| 4243 | |
| 4244 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4245 | lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
| 4246 | |
| 4247 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) |
| 4248 | return false; |
| 4249 | |
| 4250 | /* |
| 4251 | * Ensure that all in-flight IO is flushed. |
| 4252 | */ |
| 4253 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; |
| 4254 | rbd_assert(!completion_done(&rbd_dev->releasing_wait)); |
| 4255 | need_wait = !list_empty(&rbd_dev->running_list); |
| 4256 | downgrade_write(&rbd_dev->lock_rwsem); |
| 4257 | if (need_wait) |
| 4258 | wait_for_completion(&rbd_dev->releasing_wait); |
| 4259 | up_read(&rbd_dev->lock_rwsem); |
| 4260 | |
| 4261 | down_write(&rbd_dev->lock_rwsem); |
| 4262 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) |
| 4263 | return false; |
| 4264 | |
| 4265 | rbd_assert(list_empty(&rbd_dev->running_list)); |
| 4266 | return true; |
| 4267 | } |
| 4268 | |
| 4269 | static void rbd_pre_release_action(struct rbd_device *rbd_dev) |
| 4270 | { |
| 4271 | if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) |
| 4272 | rbd_object_map_close(rbd_dev); |
| 4273 | } |
| 4274 | |
| 4275 | static void __rbd_release_lock(struct rbd_device *rbd_dev) |
| 4276 | { |
| 4277 | rbd_assert(list_empty(&rbd_dev->running_list)); |
| 4278 | |
| 4279 | rbd_pre_release_action(rbd_dev); |
| 4280 | rbd_unlock(rbd_dev); |
| 4281 | } |
| 4282 | |
| 4283 | /* |
| 4284 | * lock_rwsem must be held for write |
| 4285 | */ |
| 4286 | static void rbd_release_lock(struct rbd_device *rbd_dev) |
| 4287 | { |
| 4288 | if (!rbd_quiesce_lock(rbd_dev)) |
| 4289 | return; |
| 4290 | |
| 4291 | __rbd_release_lock(rbd_dev); |
| 4292 | |
| 4293 | /* |
| 4294 | * Give others a chance to grab the lock - we would re-acquire |
| 4295 | * almost immediately if we got new IO while draining the running |
| 4296 | * list otherwise. We need to ack our own notifications, so this |
| 4297 | * lock_dwork will be requeued from rbd_handle_released_lock() by |
| 4298 | * way of maybe_kick_acquire(). |
| 4299 | */ |
| 4300 | cancel_delayed_work(&rbd_dev->lock_dwork); |
| 4301 | } |
| 4302 | |
| 4303 | static void rbd_release_lock_work(struct work_struct *work) |
| 4304 | { |
| 4305 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| 4306 | unlock_work); |
| 4307 | |
| 4308 | down_write(&rbd_dev->lock_rwsem); |
| 4309 | rbd_release_lock(rbd_dev); |
| 4310 | up_write(&rbd_dev->lock_rwsem); |
| 4311 | } |
| 4312 | |
| 4313 | static void maybe_kick_acquire(struct rbd_device *rbd_dev) |
| 4314 | { |
| 4315 | bool have_requests; |
| 4316 | |
| 4317 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4318 | if (__rbd_is_lock_owner(rbd_dev)) |
| 4319 | return; |
| 4320 | |
| 4321 | spin_lock(&rbd_dev->lock_lists_lock); |
| 4322 | have_requests = !list_empty(&rbd_dev->acquiring_list); |
| 4323 | spin_unlock(&rbd_dev->lock_lists_lock); |
| 4324 | if (have_requests || delayed_work_pending(&rbd_dev->lock_dwork)) { |
| 4325 | dout("%s rbd_dev %p kicking lock_dwork\n", __func__, rbd_dev); |
| 4326 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
| 4327 | } |
| 4328 | } |
| 4329 | |
| 4330 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| 4331 | void **p) |
| 4332 | { |
| 4333 | struct rbd_client_id cid = { 0 }; |
| 4334 | |
| 4335 | if (struct_v >= 2) { |
| 4336 | cid.gid = ceph_decode_64(p); |
| 4337 | cid.handle = ceph_decode_64(p); |
| 4338 | } |
| 4339 | |
| 4340 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| 4341 | cid.handle); |
| 4342 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
| 4343 | down_write(&rbd_dev->lock_rwsem); |
| 4344 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
| 4345 | /* |
| 4346 | * we already know that the remote client is |
| 4347 | * the owner |
| 4348 | */ |
| 4349 | up_write(&rbd_dev->lock_rwsem); |
| 4350 | return; |
| 4351 | } |
| 4352 | |
| 4353 | rbd_set_owner_cid(rbd_dev, &cid); |
| 4354 | downgrade_write(&rbd_dev->lock_rwsem); |
| 4355 | } else { |
| 4356 | down_read(&rbd_dev->lock_rwsem); |
| 4357 | } |
| 4358 | |
| 4359 | maybe_kick_acquire(rbd_dev); |
| 4360 | up_read(&rbd_dev->lock_rwsem); |
| 4361 | } |
| 4362 | |
| 4363 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| 4364 | void **p) |
| 4365 | { |
| 4366 | struct rbd_client_id cid = { 0 }; |
| 4367 | |
| 4368 | if (struct_v >= 2) { |
| 4369 | cid.gid = ceph_decode_64(p); |
| 4370 | cid.handle = ceph_decode_64(p); |
| 4371 | } |
| 4372 | |
| 4373 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| 4374 | cid.handle); |
| 4375 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
| 4376 | down_write(&rbd_dev->lock_rwsem); |
| 4377 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
| 4378 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", |
| 4379 | __func__, rbd_dev, cid.gid, cid.handle, |
| 4380 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); |
| 4381 | up_write(&rbd_dev->lock_rwsem); |
| 4382 | return; |
| 4383 | } |
| 4384 | |
| 4385 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| 4386 | downgrade_write(&rbd_dev->lock_rwsem); |
| 4387 | } else { |
| 4388 | down_read(&rbd_dev->lock_rwsem); |
| 4389 | } |
| 4390 | |
| 4391 | maybe_kick_acquire(rbd_dev); |
| 4392 | up_read(&rbd_dev->lock_rwsem); |
| 4393 | } |
| 4394 | |
| 4395 | /* |
| 4396 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no |
| 4397 | * ResponseMessage is needed. |
| 4398 | */ |
| 4399 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| 4400 | void **p) |
| 4401 | { |
| 4402 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); |
| 4403 | struct rbd_client_id cid = { 0 }; |
| 4404 | int result = 1; |
| 4405 | |
| 4406 | if (struct_v >= 2) { |
| 4407 | cid.gid = ceph_decode_64(p); |
| 4408 | cid.handle = ceph_decode_64(p); |
| 4409 | } |
| 4410 | |
| 4411 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| 4412 | cid.handle); |
| 4413 | if (rbd_cid_equal(&cid, &my_cid)) |
| 4414 | return result; |
| 4415 | |
| 4416 | down_read(&rbd_dev->lock_rwsem); |
| 4417 | if (__rbd_is_lock_owner(rbd_dev)) { |
| 4418 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && |
| 4419 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) |
| 4420 | goto out_unlock; |
| 4421 | |
| 4422 | /* |
| 4423 | * encode ResponseMessage(0) so the peer can detect |
| 4424 | * a missing owner |
| 4425 | */ |
| 4426 | result = 0; |
| 4427 | |
| 4428 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { |
| 4429 | if (!rbd_dev->opts->exclusive) { |
| 4430 | dout("%s rbd_dev %p queueing unlock_work\n", |
| 4431 | __func__, rbd_dev); |
| 4432 | queue_work(rbd_dev->task_wq, |
| 4433 | &rbd_dev->unlock_work); |
| 4434 | } else { |
| 4435 | /* refuse to release the lock */ |
| 4436 | result = -EROFS; |
| 4437 | } |
| 4438 | } |
| 4439 | } |
| 4440 | |
| 4441 | out_unlock: |
| 4442 | up_read(&rbd_dev->lock_rwsem); |
| 4443 | return result; |
| 4444 | } |
| 4445 | |
| 4446 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, |
| 4447 | u64 notify_id, u64 cookie, s32 *result) |
| 4448 | { |
| 4449 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4450 | char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
| 4451 | int buf_size = sizeof(buf); |
| 4452 | int ret; |
| 4453 | |
| 4454 | if (result) { |
| 4455 | void *p = buf; |
| 4456 | |
| 4457 | /* encode ResponseMessage */ |
| 4458 | ceph_start_encoding(&p, 1, 1, |
| 4459 | buf_size - CEPH_ENCODING_START_BLK_LEN); |
| 4460 | ceph_encode_32(&p, *result); |
| 4461 | } else { |
| 4462 | buf_size = 0; |
| 4463 | } |
| 4464 | |
| 4465 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
| 4466 | &rbd_dev->header_oloc, notify_id, cookie, |
| 4467 | buf, buf_size); |
| 4468 | if (ret) |
| 4469 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
| 4470 | } |
| 4471 | |
| 4472 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, |
| 4473 | u64 cookie) |
| 4474 | { |
| 4475 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4476 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); |
| 4477 | } |
| 4478 | |
| 4479 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, |
| 4480 | u64 notify_id, u64 cookie, s32 result) |
| 4481 | { |
| 4482 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); |
| 4483 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); |
| 4484 | } |
| 4485 | |
| 4486 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, |
| 4487 | u64 notifier_id, void *data, size_t data_len) |
| 4488 | { |
| 4489 | struct rbd_device *rbd_dev = arg; |
| 4490 | void *p = data; |
| 4491 | void *const end = p + data_len; |
| 4492 | u8 struct_v = 0; |
| 4493 | u32 len; |
| 4494 | u32 notify_op; |
| 4495 | int ret; |
| 4496 | |
| 4497 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", |
| 4498 | __func__, rbd_dev, cookie, notify_id, data_len); |
| 4499 | if (data_len) { |
| 4500 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", |
| 4501 | &struct_v, &len); |
| 4502 | if (ret) { |
| 4503 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", |
| 4504 | ret); |
| 4505 | return; |
| 4506 | } |
| 4507 | |
| 4508 | notify_op = ceph_decode_32(&p); |
| 4509 | } else { |
| 4510 | /* legacy notification for header updates */ |
| 4511 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; |
| 4512 | len = 0; |
| 4513 | } |
| 4514 | |
| 4515 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); |
| 4516 | switch (notify_op) { |
| 4517 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: |
| 4518 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); |
| 4519 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| 4520 | break; |
| 4521 | case RBD_NOTIFY_OP_RELEASED_LOCK: |
| 4522 | rbd_handle_released_lock(rbd_dev, struct_v, &p); |
| 4523 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| 4524 | break; |
| 4525 | case RBD_NOTIFY_OP_REQUEST_LOCK: |
| 4526 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
| 4527 | if (ret <= 0) |
| 4528 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
| 4529 | cookie, ret); |
| 4530 | else |
| 4531 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| 4532 | break; |
| 4533 | case RBD_NOTIFY_OP_HEADER_UPDATE: |
| 4534 | ret = rbd_dev_refresh(rbd_dev); |
| 4535 | if (ret) |
| 4536 | rbd_warn(rbd_dev, "refresh failed: %d", ret); |
| 4537 | |
| 4538 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| 4539 | break; |
| 4540 | default: |
| 4541 | if (rbd_is_lock_owner(rbd_dev)) |
| 4542 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
| 4543 | cookie, -EOPNOTSUPP); |
| 4544 | else |
| 4545 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| 4546 | break; |
| 4547 | } |
| 4548 | } |
| 4549 | |
| 4550 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
| 4551 | |
| 4552 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
| 4553 | { |
| 4554 | struct rbd_device *rbd_dev = arg; |
| 4555 | |
| 4556 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
| 4557 | |
| 4558 | down_write(&rbd_dev->lock_rwsem); |
| 4559 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| 4560 | up_write(&rbd_dev->lock_rwsem); |
| 4561 | |
| 4562 | mutex_lock(&rbd_dev->watch_mutex); |
| 4563 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { |
| 4564 | __rbd_unregister_watch(rbd_dev); |
| 4565 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; |
| 4566 | |
| 4567 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
| 4568 | } |
| 4569 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4570 | } |
| 4571 | |
| 4572 | /* |
| 4573 | * watch_mutex must be locked |
| 4574 | */ |
| 4575 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
| 4576 | { |
| 4577 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4578 | struct ceph_osd_linger_request *handle; |
| 4579 | |
| 4580 | rbd_assert(!rbd_dev->watch_handle); |
| 4581 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4582 | |
| 4583 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
| 4584 | &rbd_dev->header_oloc, rbd_watch_cb, |
| 4585 | rbd_watch_errcb, rbd_dev); |
| 4586 | if (IS_ERR(handle)) |
| 4587 | return PTR_ERR(handle); |
| 4588 | |
| 4589 | rbd_dev->watch_handle = handle; |
| 4590 | return 0; |
| 4591 | } |
| 4592 | |
| 4593 | /* |
| 4594 | * watch_mutex must be locked |
| 4595 | */ |
| 4596 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) |
| 4597 | { |
| 4598 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4599 | int ret; |
| 4600 | |
| 4601 | rbd_assert(rbd_dev->watch_handle); |
| 4602 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4603 | |
| 4604 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
| 4605 | if (ret) |
| 4606 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); |
| 4607 | |
| 4608 | rbd_dev->watch_handle = NULL; |
| 4609 | } |
| 4610 | |
| 4611 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
| 4612 | { |
| 4613 | int ret; |
| 4614 | |
| 4615 | mutex_lock(&rbd_dev->watch_mutex); |
| 4616 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); |
| 4617 | ret = __rbd_register_watch(rbd_dev); |
| 4618 | if (ret) |
| 4619 | goto out; |
| 4620 | |
| 4621 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
| 4622 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
| 4623 | |
| 4624 | out: |
| 4625 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4626 | return ret; |
| 4627 | } |
| 4628 | |
| 4629 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) |
| 4630 | { |
| 4631 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4632 | |
| 4633 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
| 4634 | cancel_work_sync(&rbd_dev->released_lock_work); |
| 4635 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); |
| 4636 | cancel_work_sync(&rbd_dev->unlock_work); |
| 4637 | } |
| 4638 | |
| 4639 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) |
| 4640 | { |
| 4641 | cancel_tasks_sync(rbd_dev); |
| 4642 | |
| 4643 | mutex_lock(&rbd_dev->watch_mutex); |
| 4644 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) |
| 4645 | __rbd_unregister_watch(rbd_dev); |
| 4646 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
| 4647 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4648 | |
| 4649 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
| 4650 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
| 4651 | } |
| 4652 | |
| 4653 | /* |
| 4654 | * lock_rwsem must be held for write |
| 4655 | */ |
| 4656 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) |
| 4657 | { |
| 4658 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4659 | char cookie[32]; |
| 4660 | int ret; |
| 4661 | |
| 4662 | if (!rbd_quiesce_lock(rbd_dev)) |
| 4663 | return; |
| 4664 | |
| 4665 | format_lock_cookie(rbd_dev, cookie); |
| 4666 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, |
| 4667 | &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| 4668 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, |
| 4669 | RBD_LOCK_TAG, cookie); |
| 4670 | if (ret) { |
| 4671 | if (ret != -EOPNOTSUPP) |
| 4672 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", |
| 4673 | ret); |
| 4674 | |
| 4675 | /* |
| 4676 | * Lock cookie cannot be updated on older OSDs, so do |
| 4677 | * a manual release and queue an acquire. |
| 4678 | */ |
| 4679 | __rbd_release_lock(rbd_dev); |
| 4680 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
| 4681 | } else { |
| 4682 | __rbd_lock(rbd_dev, cookie); |
| 4683 | wake_lock_waiters(rbd_dev, 0); |
| 4684 | } |
| 4685 | } |
| 4686 | |
| 4687 | static void rbd_reregister_watch(struct work_struct *work) |
| 4688 | { |
| 4689 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
| 4690 | struct rbd_device, watch_dwork); |
| 4691 | int ret; |
| 4692 | |
| 4693 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| 4694 | |
| 4695 | mutex_lock(&rbd_dev->watch_mutex); |
| 4696 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
| 4697 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4698 | return; |
| 4699 | } |
| 4700 | |
| 4701 | ret = __rbd_register_watch(rbd_dev); |
| 4702 | if (ret) { |
| 4703 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); |
| 4704 | if (ret != -EBLACKLISTED && ret != -ENOENT) { |
| 4705 | queue_delayed_work(rbd_dev->task_wq, |
| 4706 | &rbd_dev->watch_dwork, |
| 4707 | RBD_RETRY_DELAY); |
| 4708 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4709 | return; |
| 4710 | } |
| 4711 | |
| 4712 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4713 | down_write(&rbd_dev->lock_rwsem); |
| 4714 | wake_lock_waiters(rbd_dev, ret); |
| 4715 | up_write(&rbd_dev->lock_rwsem); |
| 4716 | return; |
| 4717 | } |
| 4718 | |
| 4719 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
| 4720 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
| 4721 | mutex_unlock(&rbd_dev->watch_mutex); |
| 4722 | |
| 4723 | down_write(&rbd_dev->lock_rwsem); |
| 4724 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) |
| 4725 | rbd_reacquire_lock(rbd_dev); |
| 4726 | up_write(&rbd_dev->lock_rwsem); |
| 4727 | |
| 4728 | ret = rbd_dev_refresh(rbd_dev); |
| 4729 | if (ret) |
| 4730 | rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
| 4731 | } |
| 4732 | |
| 4733 | /* |
| 4734 | * Synchronous osd object method call. Returns the number of bytes |
| 4735 | * returned in the outbound buffer, or a negative error code. |
| 4736 | */ |
| 4737 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
| 4738 | struct ceph_object_id *oid, |
| 4739 | struct ceph_object_locator *oloc, |
| 4740 | const char *method_name, |
| 4741 | const void *outbound, |
| 4742 | size_t outbound_size, |
| 4743 | void *inbound, |
| 4744 | size_t inbound_size) |
| 4745 | { |
| 4746 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4747 | struct page *req_page = NULL; |
| 4748 | struct page *reply_page; |
| 4749 | int ret; |
| 4750 | |
| 4751 | /* |
| 4752 | * Method calls are ultimately read operations. The result |
| 4753 | * should placed into the inbound buffer provided. They |
| 4754 | * also supply outbound data--parameters for the object |
| 4755 | * method. Currently if this is present it will be a |
| 4756 | * snapshot id. |
| 4757 | */ |
| 4758 | if (outbound) { |
| 4759 | if (outbound_size > PAGE_SIZE) |
| 4760 | return -E2BIG; |
| 4761 | |
| 4762 | req_page = alloc_page(GFP_KERNEL); |
| 4763 | if (!req_page) |
| 4764 | return -ENOMEM; |
| 4765 | |
| 4766 | memcpy(page_address(req_page), outbound, outbound_size); |
| 4767 | } |
| 4768 | |
| 4769 | reply_page = alloc_page(GFP_KERNEL); |
| 4770 | if (!reply_page) { |
| 4771 | if (req_page) |
| 4772 | __free_page(req_page); |
| 4773 | return -ENOMEM; |
| 4774 | } |
| 4775 | |
| 4776 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
| 4777 | CEPH_OSD_FLAG_READ, req_page, outbound_size, |
| 4778 | &reply_page, &inbound_size); |
| 4779 | if (!ret) { |
| 4780 | memcpy(inbound, page_address(reply_page), inbound_size); |
| 4781 | ret = inbound_size; |
| 4782 | } |
| 4783 | |
| 4784 | if (req_page) |
| 4785 | __free_page(req_page); |
| 4786 | __free_page(reply_page); |
| 4787 | return ret; |
| 4788 | } |
| 4789 | |
| 4790 | static void rbd_queue_workfn(struct work_struct *work) |
| 4791 | { |
| 4792 | struct request *rq = blk_mq_rq_from_pdu(work); |
| 4793 | struct rbd_device *rbd_dev = rq->q->queuedata; |
| 4794 | struct rbd_img_request *img_request; |
| 4795 | struct ceph_snap_context *snapc = NULL; |
| 4796 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
| 4797 | u64 length = blk_rq_bytes(rq); |
| 4798 | enum obj_operation_type op_type; |
| 4799 | u64 mapping_size; |
| 4800 | int result; |
| 4801 | |
| 4802 | switch (req_op(rq)) { |
| 4803 | case REQ_OP_DISCARD: |
| 4804 | op_type = OBJ_OP_DISCARD; |
| 4805 | break; |
| 4806 | case REQ_OP_WRITE_ZEROES: |
| 4807 | op_type = OBJ_OP_ZEROOUT; |
| 4808 | break; |
| 4809 | case REQ_OP_WRITE: |
| 4810 | op_type = OBJ_OP_WRITE; |
| 4811 | break; |
| 4812 | case REQ_OP_READ: |
| 4813 | op_type = OBJ_OP_READ; |
| 4814 | break; |
| 4815 | default: |
| 4816 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); |
| 4817 | result = -EIO; |
| 4818 | goto err; |
| 4819 | } |
| 4820 | |
| 4821 | /* Ignore/skip any zero-length requests */ |
| 4822 | |
| 4823 | if (!length) { |
| 4824 | dout("%s: zero-length request\n", __func__); |
| 4825 | result = 0; |
| 4826 | goto err_rq; |
| 4827 | } |
| 4828 | |
| 4829 | if (op_type != OBJ_OP_READ && rbd_dev->spec->snap_id != CEPH_NOSNAP) { |
| 4830 | rbd_warn(rbd_dev, "%s on read-only snapshot", |
| 4831 | obj_op_name(op_type)); |
| 4832 | result = -EIO; |
| 4833 | goto err; |
| 4834 | } |
| 4835 | |
| 4836 | /* |
| 4837 | * Quit early if the mapped snapshot no longer exists. It's |
| 4838 | * still possible the snapshot will have disappeared by the |
| 4839 | * time our request arrives at the osd, but there's no sense in |
| 4840 | * sending it if we already know. |
| 4841 | */ |
| 4842 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { |
| 4843 | dout("request for non-existent snapshot"); |
| 4844 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); |
| 4845 | result = -ENXIO; |
| 4846 | goto err_rq; |
| 4847 | } |
| 4848 | |
| 4849 | if (offset && length > U64_MAX - offset + 1) { |
| 4850 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, |
| 4851 | length); |
| 4852 | result = -EINVAL; |
| 4853 | goto err_rq; /* Shouldn't happen */ |
| 4854 | } |
| 4855 | |
| 4856 | blk_mq_start_request(rq); |
| 4857 | |
| 4858 | down_read(&rbd_dev->header_rwsem); |
| 4859 | mapping_size = rbd_dev->mapping.size; |
| 4860 | if (op_type != OBJ_OP_READ) { |
| 4861 | snapc = rbd_dev->header.snapc; |
| 4862 | ceph_get_snap_context(snapc); |
| 4863 | } |
| 4864 | up_read(&rbd_dev->header_rwsem); |
| 4865 | |
| 4866 | if (offset + length > mapping_size) { |
| 4867 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
| 4868 | length, mapping_size); |
| 4869 | result = -EIO; |
| 4870 | goto err_rq; |
| 4871 | } |
| 4872 | |
| 4873 | img_request = rbd_img_request_create(rbd_dev, op_type, snapc); |
| 4874 | if (!img_request) { |
| 4875 | result = -ENOMEM; |
| 4876 | goto err_rq; |
| 4877 | } |
| 4878 | img_request->rq = rq; |
| 4879 | snapc = NULL; /* img_request consumes a ref */ |
| 4880 | |
| 4881 | dout("%s rbd_dev %p img_req %p %s %llu~%llu\n", __func__, rbd_dev, |
| 4882 | img_request, obj_op_name(op_type), offset, length); |
| 4883 | |
| 4884 | if (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_ZEROOUT) |
| 4885 | result = rbd_img_fill_nodata(img_request, offset, length); |
| 4886 | else |
| 4887 | result = rbd_img_fill_from_bio(img_request, offset, length, |
| 4888 | rq->bio); |
| 4889 | if (result) |
| 4890 | goto err_img_request; |
| 4891 | |
| 4892 | rbd_img_handle_request(img_request, 0); |
| 4893 | return; |
| 4894 | |
| 4895 | err_img_request: |
| 4896 | rbd_img_request_put(img_request); |
| 4897 | err_rq: |
| 4898 | if (result) |
| 4899 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", |
| 4900 | obj_op_name(op_type), length, offset, result); |
| 4901 | ceph_put_snap_context(snapc); |
| 4902 | err: |
| 4903 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
| 4904 | } |
| 4905 | |
| 4906 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
| 4907 | const struct blk_mq_queue_data *bd) |
| 4908 | { |
| 4909 | struct request *rq = bd->rq; |
| 4910 | struct work_struct *work = blk_mq_rq_to_pdu(rq); |
| 4911 | |
| 4912 | queue_work(rbd_wq, work); |
| 4913 | return BLK_STS_OK; |
| 4914 | } |
| 4915 | |
| 4916 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
| 4917 | { |
| 4918 | blk_cleanup_queue(rbd_dev->disk->queue); |
| 4919 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
| 4920 | put_disk(rbd_dev->disk); |
| 4921 | rbd_dev->disk = NULL; |
| 4922 | } |
| 4923 | |
| 4924 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
| 4925 | struct ceph_object_id *oid, |
| 4926 | struct ceph_object_locator *oloc, |
| 4927 | void *buf, int buf_len) |
| 4928 | |
| 4929 | { |
| 4930 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 4931 | struct ceph_osd_request *req; |
| 4932 | struct page **pages; |
| 4933 | int num_pages = calc_pages_for(0, buf_len); |
| 4934 | int ret; |
| 4935 | |
| 4936 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
| 4937 | if (!req) |
| 4938 | return -ENOMEM; |
| 4939 | |
| 4940 | ceph_oid_copy(&req->r_base_oid, oid); |
| 4941 | ceph_oloc_copy(&req->r_base_oloc, oloc); |
| 4942 | req->r_flags = CEPH_OSD_FLAG_READ; |
| 4943 | |
| 4944 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
| 4945 | if (IS_ERR(pages)) { |
| 4946 | ret = PTR_ERR(pages); |
| 4947 | goto out_req; |
| 4948 | } |
| 4949 | |
| 4950 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
| 4951 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, |
| 4952 | true); |
| 4953 | |
| 4954 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
| 4955 | if (ret) |
| 4956 | goto out_req; |
| 4957 | |
| 4958 | ceph_osdc_start_request(osdc, req, false); |
| 4959 | ret = ceph_osdc_wait_request(osdc, req); |
| 4960 | if (ret >= 0) |
| 4961 | ceph_copy_from_page_vector(pages, buf, 0, ret); |
| 4962 | |
| 4963 | out_req: |
| 4964 | ceph_osdc_put_request(req); |
| 4965 | return ret; |
| 4966 | } |
| 4967 | |
| 4968 | /* |
| 4969 | * Read the complete header for the given rbd device. On successful |
| 4970 | * return, the rbd_dev->header field will contain up-to-date |
| 4971 | * information about the image. |
| 4972 | */ |
| 4973 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
| 4974 | { |
| 4975 | struct rbd_image_header_ondisk *ondisk = NULL; |
| 4976 | u32 snap_count = 0; |
| 4977 | u64 names_size = 0; |
| 4978 | u32 want_count; |
| 4979 | int ret; |
| 4980 | |
| 4981 | /* |
| 4982 | * The complete header will include an array of its 64-bit |
| 4983 | * snapshot ids, followed by the names of those snapshots as |
| 4984 | * a contiguous block of NUL-terminated strings. Note that |
| 4985 | * the number of snapshots could change by the time we read |
| 4986 | * it in, in which case we re-read it. |
| 4987 | */ |
| 4988 | do { |
| 4989 | size_t size; |
| 4990 | |
| 4991 | kfree(ondisk); |
| 4992 | |
| 4993 | size = sizeof (*ondisk); |
| 4994 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); |
| 4995 | size += names_size; |
| 4996 | ondisk = kmalloc(size, GFP_KERNEL); |
| 4997 | if (!ondisk) |
| 4998 | return -ENOMEM; |
| 4999 | |
| 5000 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
| 5001 | &rbd_dev->header_oloc, ondisk, size); |
| 5002 | if (ret < 0) |
| 5003 | goto out; |
| 5004 | if ((size_t)ret < size) { |
| 5005 | ret = -ENXIO; |
| 5006 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
| 5007 | size, ret); |
| 5008 | goto out; |
| 5009 | } |
| 5010 | if (!rbd_dev_ondisk_valid(ondisk)) { |
| 5011 | ret = -ENXIO; |
| 5012 | rbd_warn(rbd_dev, "invalid header"); |
| 5013 | goto out; |
| 5014 | } |
| 5015 | |
| 5016 | names_size = le64_to_cpu(ondisk->snap_names_len); |
| 5017 | want_count = snap_count; |
| 5018 | snap_count = le32_to_cpu(ondisk->snap_count); |
| 5019 | } while (snap_count != want_count); |
| 5020 | |
| 5021 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
| 5022 | out: |
| 5023 | kfree(ondisk); |
| 5024 | |
| 5025 | return ret; |
| 5026 | } |
| 5027 | |
| 5028 | /* |
| 5029 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to |
| 5030 | * has disappeared from the (just updated) snapshot context. |
| 5031 | */ |
| 5032 | static void rbd_exists_validate(struct rbd_device *rbd_dev) |
| 5033 | { |
| 5034 | u64 snap_id; |
| 5035 | |
| 5036 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) |
| 5037 | return; |
| 5038 | |
| 5039 | snap_id = rbd_dev->spec->snap_id; |
| 5040 | if (snap_id == CEPH_NOSNAP) |
| 5041 | return; |
| 5042 | |
| 5043 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) |
| 5044 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| 5045 | } |
| 5046 | |
| 5047 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
| 5048 | { |
| 5049 | sector_t size; |
| 5050 | |
| 5051 | /* |
| 5052 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
| 5053 | * try to update its size. If REMOVING is set, updating size |
| 5054 | * is just useless work since the device can't be opened. |
| 5055 | */ |
| 5056 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
| 5057 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { |
| 5058 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
| 5059 | dout("setting size to %llu sectors", (unsigned long long)size); |
| 5060 | set_capacity(rbd_dev->disk, size); |
| 5061 | revalidate_disk(rbd_dev->disk); |
| 5062 | } |
| 5063 | } |
| 5064 | |
| 5065 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
| 5066 | { |
| 5067 | u64 mapping_size; |
| 5068 | int ret; |
| 5069 | |
| 5070 | down_write(&rbd_dev->header_rwsem); |
| 5071 | mapping_size = rbd_dev->mapping.size; |
| 5072 | |
| 5073 | ret = rbd_dev_header_info(rbd_dev); |
| 5074 | if (ret) |
| 5075 | goto out; |
| 5076 | |
| 5077 | /* |
| 5078 | * If there is a parent, see if it has disappeared due to the |
| 5079 | * mapped image getting flattened. |
| 5080 | */ |
| 5081 | if (rbd_dev->parent) { |
| 5082 | ret = rbd_dev_v2_parent_info(rbd_dev); |
| 5083 | if (ret) |
| 5084 | goto out; |
| 5085 | } |
| 5086 | |
| 5087 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
| 5088 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
| 5089 | } else { |
| 5090 | /* validate mapped snapshot's EXISTS flag */ |
| 5091 | rbd_exists_validate(rbd_dev); |
| 5092 | } |
| 5093 | |
| 5094 | out: |
| 5095 | up_write(&rbd_dev->header_rwsem); |
| 5096 | if (!ret && mapping_size != rbd_dev->mapping.size) |
| 5097 | rbd_dev_update_size(rbd_dev); |
| 5098 | |
| 5099 | return ret; |
| 5100 | } |
| 5101 | |
| 5102 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
| 5103 | unsigned int hctx_idx, unsigned int numa_node) |
| 5104 | { |
| 5105 | struct work_struct *work = blk_mq_rq_to_pdu(rq); |
| 5106 | |
| 5107 | INIT_WORK(work, rbd_queue_workfn); |
| 5108 | return 0; |
| 5109 | } |
| 5110 | |
| 5111 | static const struct blk_mq_ops rbd_mq_ops = { |
| 5112 | .queue_rq = rbd_queue_rq, |
| 5113 | .init_request = rbd_init_request, |
| 5114 | }; |
| 5115 | |
| 5116 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
| 5117 | { |
| 5118 | struct gendisk *disk; |
| 5119 | struct request_queue *q; |
| 5120 | unsigned int objset_bytes = |
| 5121 | rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; |
| 5122 | int err; |
| 5123 | |
| 5124 | /* create gendisk info */ |
| 5125 | disk = alloc_disk(single_major ? |
| 5126 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : |
| 5127 | RBD_MINORS_PER_MAJOR); |
| 5128 | if (!disk) |
| 5129 | return -ENOMEM; |
| 5130 | |
| 5131 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
| 5132 | rbd_dev->dev_id); |
| 5133 | disk->major = rbd_dev->major; |
| 5134 | disk->first_minor = rbd_dev->minor; |
| 5135 | if (single_major) |
| 5136 | disk->flags |= GENHD_FL_EXT_DEVT; |
| 5137 | disk->fops = &rbd_bd_ops; |
| 5138 | disk->private_data = rbd_dev; |
| 5139 | |
| 5140 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
| 5141 | rbd_dev->tag_set.ops = &rbd_mq_ops; |
| 5142 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
| 5143 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
| 5144 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
| 5145 | rbd_dev->tag_set.nr_hw_queues = 1; |
| 5146 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); |
| 5147 | |
| 5148 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); |
| 5149 | if (err) |
| 5150 | goto out_disk; |
| 5151 | |
| 5152 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
| 5153 | if (IS_ERR(q)) { |
| 5154 | err = PTR_ERR(q); |
| 5155 | goto out_tag_set; |
| 5156 | } |
| 5157 | |
| 5158 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
| 5159 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
| 5160 | |
| 5161 | blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
| 5162 | q->limits.max_sectors = queue_max_hw_sectors(q); |
| 5163 | blk_queue_max_segments(q, USHRT_MAX); |
| 5164 | blk_queue_max_segment_size(q, UINT_MAX); |
| 5165 | blk_queue_io_min(q, rbd_dev->opts->alloc_size); |
| 5166 | blk_queue_io_opt(q, rbd_dev->opts->alloc_size); |
| 5167 | |
| 5168 | if (rbd_dev->opts->trim) { |
| 5169 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); |
| 5170 | q->limits.discard_granularity = rbd_dev->opts->alloc_size; |
| 5171 | blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); |
| 5172 | blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); |
| 5173 | } |
| 5174 | |
| 5175 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
| 5176 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
| 5177 | |
| 5178 | /* |
| 5179 | * disk_release() expects a queue ref from add_disk() and will |
| 5180 | * put it. Hold an extra ref until add_disk() is called. |
| 5181 | */ |
| 5182 | WARN_ON(!blk_get_queue(q)); |
| 5183 | disk->queue = q; |
| 5184 | q->queuedata = rbd_dev; |
| 5185 | |
| 5186 | rbd_dev->disk = disk; |
| 5187 | |
| 5188 | return 0; |
| 5189 | out_tag_set: |
| 5190 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
| 5191 | out_disk: |
| 5192 | put_disk(disk); |
| 5193 | return err; |
| 5194 | } |
| 5195 | |
| 5196 | /* |
| 5197 | sysfs |
| 5198 | */ |
| 5199 | |
| 5200 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
| 5201 | { |
| 5202 | return container_of(dev, struct rbd_device, dev); |
| 5203 | } |
| 5204 | |
| 5205 | static ssize_t rbd_size_show(struct device *dev, |
| 5206 | struct device_attribute *attr, char *buf) |
| 5207 | { |
| 5208 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5209 | |
| 5210 | return sprintf(buf, "%llu\n", |
| 5211 | (unsigned long long)rbd_dev->mapping.size); |
| 5212 | } |
| 5213 | |
| 5214 | /* |
| 5215 | * Note this shows the features for whatever's mapped, which is not |
| 5216 | * necessarily the base image. |
| 5217 | */ |
| 5218 | static ssize_t rbd_features_show(struct device *dev, |
| 5219 | struct device_attribute *attr, char *buf) |
| 5220 | { |
| 5221 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5222 | |
| 5223 | return sprintf(buf, "0x%016llx\n", |
| 5224 | (unsigned long long)rbd_dev->mapping.features); |
| 5225 | } |
| 5226 | |
| 5227 | static ssize_t rbd_major_show(struct device *dev, |
| 5228 | struct device_attribute *attr, char *buf) |
| 5229 | { |
| 5230 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5231 | |
| 5232 | if (rbd_dev->major) |
| 5233 | return sprintf(buf, "%d\n", rbd_dev->major); |
| 5234 | |
| 5235 | return sprintf(buf, "(none)\n"); |
| 5236 | } |
| 5237 | |
| 5238 | static ssize_t rbd_minor_show(struct device *dev, |
| 5239 | struct device_attribute *attr, char *buf) |
| 5240 | { |
| 5241 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5242 | |
| 5243 | return sprintf(buf, "%d\n", rbd_dev->minor); |
| 5244 | } |
| 5245 | |
| 5246 | static ssize_t rbd_client_addr_show(struct device *dev, |
| 5247 | struct device_attribute *attr, char *buf) |
| 5248 | { |
| 5249 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5250 | struct ceph_entity_addr *client_addr = |
| 5251 | ceph_client_addr(rbd_dev->rbd_client->client); |
| 5252 | |
| 5253 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, |
| 5254 | le32_to_cpu(client_addr->nonce)); |
| 5255 | } |
| 5256 | |
| 5257 | static ssize_t rbd_client_id_show(struct device *dev, |
| 5258 | struct device_attribute *attr, char *buf) |
| 5259 | { |
| 5260 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5261 | |
| 5262 | return sprintf(buf, "client%lld\n", |
| 5263 | ceph_client_gid(rbd_dev->rbd_client->client)); |
| 5264 | } |
| 5265 | |
| 5266 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
| 5267 | struct device_attribute *attr, char *buf) |
| 5268 | { |
| 5269 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5270 | |
| 5271 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); |
| 5272 | } |
| 5273 | |
| 5274 | static ssize_t rbd_config_info_show(struct device *dev, |
| 5275 | struct device_attribute *attr, char *buf) |
| 5276 | { |
| 5277 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5278 | |
| 5279 | return sprintf(buf, "%s\n", rbd_dev->config_info); |
| 5280 | } |
| 5281 | |
| 5282 | static ssize_t rbd_pool_show(struct device *dev, |
| 5283 | struct device_attribute *attr, char *buf) |
| 5284 | { |
| 5285 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5286 | |
| 5287 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
| 5288 | } |
| 5289 | |
| 5290 | static ssize_t rbd_pool_id_show(struct device *dev, |
| 5291 | struct device_attribute *attr, char *buf) |
| 5292 | { |
| 5293 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5294 | |
| 5295 | return sprintf(buf, "%llu\n", |
| 5296 | (unsigned long long) rbd_dev->spec->pool_id); |
| 5297 | } |
| 5298 | |
| 5299 | static ssize_t rbd_pool_ns_show(struct device *dev, |
| 5300 | struct device_attribute *attr, char *buf) |
| 5301 | { |
| 5302 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5303 | |
| 5304 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_ns ?: ""); |
| 5305 | } |
| 5306 | |
| 5307 | static ssize_t rbd_name_show(struct device *dev, |
| 5308 | struct device_attribute *attr, char *buf) |
| 5309 | { |
| 5310 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5311 | |
| 5312 | if (rbd_dev->spec->image_name) |
| 5313 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); |
| 5314 | |
| 5315 | return sprintf(buf, "(unknown)\n"); |
| 5316 | } |
| 5317 | |
| 5318 | static ssize_t rbd_image_id_show(struct device *dev, |
| 5319 | struct device_attribute *attr, char *buf) |
| 5320 | { |
| 5321 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5322 | |
| 5323 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
| 5324 | } |
| 5325 | |
| 5326 | /* |
| 5327 | * Shows the name of the currently-mapped snapshot (or |
| 5328 | * RBD_SNAP_HEAD_NAME for the base image). |
| 5329 | */ |
| 5330 | static ssize_t rbd_snap_show(struct device *dev, |
| 5331 | struct device_attribute *attr, |
| 5332 | char *buf) |
| 5333 | { |
| 5334 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5335 | |
| 5336 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
| 5337 | } |
| 5338 | |
| 5339 | static ssize_t rbd_snap_id_show(struct device *dev, |
| 5340 | struct device_attribute *attr, char *buf) |
| 5341 | { |
| 5342 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5343 | |
| 5344 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); |
| 5345 | } |
| 5346 | |
| 5347 | /* |
| 5348 | * For a v2 image, shows the chain of parent images, separated by empty |
| 5349 | * lines. For v1 images or if there is no parent, shows "(no parent |
| 5350 | * image)". |
| 5351 | */ |
| 5352 | static ssize_t rbd_parent_show(struct device *dev, |
| 5353 | struct device_attribute *attr, |
| 5354 | char *buf) |
| 5355 | { |
| 5356 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5357 | ssize_t count = 0; |
| 5358 | |
| 5359 | if (!rbd_dev->parent) |
| 5360 | return sprintf(buf, "(no parent image)\n"); |
| 5361 | |
| 5362 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
| 5363 | struct rbd_spec *spec = rbd_dev->parent_spec; |
| 5364 | |
| 5365 | count += sprintf(&buf[count], "%s" |
| 5366 | "pool_id %llu\npool_name %s\n" |
| 5367 | "pool_ns %s\n" |
| 5368 | "image_id %s\nimage_name %s\n" |
| 5369 | "snap_id %llu\nsnap_name %s\n" |
| 5370 | "overlap %llu\n", |
| 5371 | !count ? "" : "\n", /* first? */ |
| 5372 | spec->pool_id, spec->pool_name, |
| 5373 | spec->pool_ns ?: "", |
| 5374 | spec->image_id, spec->image_name ?: "(unknown)", |
| 5375 | spec->snap_id, spec->snap_name, |
| 5376 | rbd_dev->parent_overlap); |
| 5377 | } |
| 5378 | |
| 5379 | return count; |
| 5380 | } |
| 5381 | |
| 5382 | static ssize_t rbd_image_refresh(struct device *dev, |
| 5383 | struct device_attribute *attr, |
| 5384 | const char *buf, |
| 5385 | size_t size) |
| 5386 | { |
| 5387 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5388 | int ret; |
| 5389 | |
| 5390 | ret = rbd_dev_refresh(rbd_dev); |
| 5391 | if (ret) |
| 5392 | return ret; |
| 5393 | |
| 5394 | return size; |
| 5395 | } |
| 5396 | |
| 5397 | static DEVICE_ATTR(size, 0444, rbd_size_show, NULL); |
| 5398 | static DEVICE_ATTR(features, 0444, rbd_features_show, NULL); |
| 5399 | static DEVICE_ATTR(major, 0444, rbd_major_show, NULL); |
| 5400 | static DEVICE_ATTR(minor, 0444, rbd_minor_show, NULL); |
| 5401 | static DEVICE_ATTR(client_addr, 0444, rbd_client_addr_show, NULL); |
| 5402 | static DEVICE_ATTR(client_id, 0444, rbd_client_id_show, NULL); |
| 5403 | static DEVICE_ATTR(cluster_fsid, 0444, rbd_cluster_fsid_show, NULL); |
| 5404 | static DEVICE_ATTR(config_info, 0400, rbd_config_info_show, NULL); |
| 5405 | static DEVICE_ATTR(pool, 0444, rbd_pool_show, NULL); |
| 5406 | static DEVICE_ATTR(pool_id, 0444, rbd_pool_id_show, NULL); |
| 5407 | static DEVICE_ATTR(pool_ns, 0444, rbd_pool_ns_show, NULL); |
| 5408 | static DEVICE_ATTR(name, 0444, rbd_name_show, NULL); |
| 5409 | static DEVICE_ATTR(image_id, 0444, rbd_image_id_show, NULL); |
| 5410 | static DEVICE_ATTR(refresh, 0200, NULL, rbd_image_refresh); |
| 5411 | static DEVICE_ATTR(current_snap, 0444, rbd_snap_show, NULL); |
| 5412 | static DEVICE_ATTR(snap_id, 0444, rbd_snap_id_show, NULL); |
| 5413 | static DEVICE_ATTR(parent, 0444, rbd_parent_show, NULL); |
| 5414 | |
| 5415 | static struct attribute *rbd_attrs[] = { |
| 5416 | &dev_attr_size.attr, |
| 5417 | &dev_attr_features.attr, |
| 5418 | &dev_attr_major.attr, |
| 5419 | &dev_attr_minor.attr, |
| 5420 | &dev_attr_client_addr.attr, |
| 5421 | &dev_attr_client_id.attr, |
| 5422 | &dev_attr_cluster_fsid.attr, |
| 5423 | &dev_attr_config_info.attr, |
| 5424 | &dev_attr_pool.attr, |
| 5425 | &dev_attr_pool_id.attr, |
| 5426 | &dev_attr_pool_ns.attr, |
| 5427 | &dev_attr_name.attr, |
| 5428 | &dev_attr_image_id.attr, |
| 5429 | &dev_attr_current_snap.attr, |
| 5430 | &dev_attr_snap_id.attr, |
| 5431 | &dev_attr_parent.attr, |
| 5432 | &dev_attr_refresh.attr, |
| 5433 | NULL |
| 5434 | }; |
| 5435 | |
| 5436 | static struct attribute_group rbd_attr_group = { |
| 5437 | .attrs = rbd_attrs, |
| 5438 | }; |
| 5439 | |
| 5440 | static const struct attribute_group *rbd_attr_groups[] = { |
| 5441 | &rbd_attr_group, |
| 5442 | NULL |
| 5443 | }; |
| 5444 | |
| 5445 | static void rbd_dev_release(struct device *dev); |
| 5446 | |
| 5447 | static const struct device_type rbd_device_type = { |
| 5448 | .name = "rbd", |
| 5449 | .groups = rbd_attr_groups, |
| 5450 | .release = rbd_dev_release, |
| 5451 | }; |
| 5452 | |
| 5453 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
| 5454 | { |
| 5455 | kref_get(&spec->kref); |
| 5456 | |
| 5457 | return spec; |
| 5458 | } |
| 5459 | |
| 5460 | static void rbd_spec_free(struct kref *kref); |
| 5461 | static void rbd_spec_put(struct rbd_spec *spec) |
| 5462 | { |
| 5463 | if (spec) |
| 5464 | kref_put(&spec->kref, rbd_spec_free); |
| 5465 | } |
| 5466 | |
| 5467 | static struct rbd_spec *rbd_spec_alloc(void) |
| 5468 | { |
| 5469 | struct rbd_spec *spec; |
| 5470 | |
| 5471 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); |
| 5472 | if (!spec) |
| 5473 | return NULL; |
| 5474 | |
| 5475 | spec->pool_id = CEPH_NOPOOL; |
| 5476 | spec->snap_id = CEPH_NOSNAP; |
| 5477 | kref_init(&spec->kref); |
| 5478 | |
| 5479 | return spec; |
| 5480 | } |
| 5481 | |
| 5482 | static void rbd_spec_free(struct kref *kref) |
| 5483 | { |
| 5484 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); |
| 5485 | |
| 5486 | kfree(spec->pool_name); |
| 5487 | kfree(spec->pool_ns); |
| 5488 | kfree(spec->image_id); |
| 5489 | kfree(spec->image_name); |
| 5490 | kfree(spec->snap_name); |
| 5491 | kfree(spec); |
| 5492 | } |
| 5493 | |
| 5494 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
| 5495 | { |
| 5496 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
| 5497 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
| 5498 | |
| 5499 | ceph_oid_destroy(&rbd_dev->header_oid); |
| 5500 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
| 5501 | kfree(rbd_dev->config_info); |
| 5502 | |
| 5503 | rbd_put_client(rbd_dev->rbd_client); |
| 5504 | rbd_spec_put(rbd_dev->spec); |
| 5505 | kfree(rbd_dev->opts); |
| 5506 | kfree(rbd_dev); |
| 5507 | } |
| 5508 | |
| 5509 | static void rbd_dev_release(struct device *dev) |
| 5510 | { |
| 5511 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| 5512 | bool need_put = !!rbd_dev->opts; |
| 5513 | |
| 5514 | if (need_put) { |
| 5515 | destroy_workqueue(rbd_dev->task_wq); |
| 5516 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
| 5517 | } |
| 5518 | |
| 5519 | rbd_dev_free(rbd_dev); |
| 5520 | |
| 5521 | /* |
| 5522 | * This is racy, but way better than putting module outside of |
| 5523 | * the release callback. The race window is pretty small, so |
| 5524 | * doing something similar to dm (dm-builtin.c) is overkill. |
| 5525 | */ |
| 5526 | if (need_put) |
| 5527 | module_put(THIS_MODULE); |
| 5528 | } |
| 5529 | |
| 5530 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
| 5531 | struct rbd_spec *spec) |
| 5532 | { |
| 5533 | struct rbd_device *rbd_dev; |
| 5534 | |
| 5535 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
| 5536 | if (!rbd_dev) |
| 5537 | return NULL; |
| 5538 | |
| 5539 | spin_lock_init(&rbd_dev->lock); |
| 5540 | INIT_LIST_HEAD(&rbd_dev->node); |
| 5541 | init_rwsem(&rbd_dev->header_rwsem); |
| 5542 | |
| 5543 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
| 5544 | ceph_oid_init(&rbd_dev->header_oid); |
| 5545 | rbd_dev->header_oloc.pool = spec->pool_id; |
| 5546 | if (spec->pool_ns) { |
| 5547 | WARN_ON(!*spec->pool_ns); |
| 5548 | rbd_dev->header_oloc.pool_ns = |
| 5549 | ceph_find_or_create_string(spec->pool_ns, |
| 5550 | strlen(spec->pool_ns)); |
| 5551 | } |
| 5552 | |
| 5553 | mutex_init(&rbd_dev->watch_mutex); |
| 5554 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
| 5555 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); |
| 5556 | |
| 5557 | init_rwsem(&rbd_dev->lock_rwsem); |
| 5558 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
| 5559 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); |
| 5560 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); |
| 5561 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); |
| 5562 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); |
| 5563 | spin_lock_init(&rbd_dev->lock_lists_lock); |
| 5564 | INIT_LIST_HEAD(&rbd_dev->acquiring_list); |
| 5565 | INIT_LIST_HEAD(&rbd_dev->running_list); |
| 5566 | init_completion(&rbd_dev->acquire_wait); |
| 5567 | init_completion(&rbd_dev->releasing_wait); |
| 5568 | |
| 5569 | spin_lock_init(&rbd_dev->object_map_lock); |
| 5570 | |
| 5571 | rbd_dev->dev.bus = &rbd_bus_type; |
| 5572 | rbd_dev->dev.type = &rbd_device_type; |
| 5573 | rbd_dev->dev.parent = &rbd_root_dev; |
| 5574 | device_initialize(&rbd_dev->dev); |
| 5575 | |
| 5576 | rbd_dev->rbd_client = rbdc; |
| 5577 | rbd_dev->spec = spec; |
| 5578 | |
| 5579 | return rbd_dev; |
| 5580 | } |
| 5581 | |
| 5582 | /* |
| 5583 | * Create a mapping rbd_dev. |
| 5584 | */ |
| 5585 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
| 5586 | struct rbd_spec *spec, |
| 5587 | struct rbd_options *opts) |
| 5588 | { |
| 5589 | struct rbd_device *rbd_dev; |
| 5590 | |
| 5591 | rbd_dev = __rbd_dev_create(rbdc, spec); |
| 5592 | if (!rbd_dev) |
| 5593 | return NULL; |
| 5594 | |
| 5595 | rbd_dev->opts = opts; |
| 5596 | |
| 5597 | /* get an id and fill in device name */ |
| 5598 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, |
| 5599 | minor_to_rbd_dev_id(1 << MINORBITS), |
| 5600 | GFP_KERNEL); |
| 5601 | if (rbd_dev->dev_id < 0) |
| 5602 | goto fail_rbd_dev; |
| 5603 | |
| 5604 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); |
| 5605 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, |
| 5606 | rbd_dev->name); |
| 5607 | if (!rbd_dev->task_wq) |
| 5608 | goto fail_dev_id; |
| 5609 | |
| 5610 | /* we have a ref from do_rbd_add() */ |
| 5611 | __module_get(THIS_MODULE); |
| 5612 | |
| 5613 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
| 5614 | return rbd_dev; |
| 5615 | |
| 5616 | fail_dev_id: |
| 5617 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
| 5618 | fail_rbd_dev: |
| 5619 | rbd_dev_free(rbd_dev); |
| 5620 | return NULL; |
| 5621 | } |
| 5622 | |
| 5623 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
| 5624 | { |
| 5625 | if (rbd_dev) |
| 5626 | put_device(&rbd_dev->dev); |
| 5627 | } |
| 5628 | |
| 5629 | /* |
| 5630 | * Get the size and object order for an image snapshot, or if |
| 5631 | * snap_id is CEPH_NOSNAP, gets this information for the base |
| 5632 | * image. |
| 5633 | */ |
| 5634 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| 5635 | u8 *order, u64 *snap_size) |
| 5636 | { |
| 5637 | __le64 snapid = cpu_to_le64(snap_id); |
| 5638 | int ret; |
| 5639 | struct { |
| 5640 | u8 order; |
| 5641 | __le64 size; |
| 5642 | } __attribute__ ((packed)) size_buf = { 0 }; |
| 5643 | |
| 5644 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 5645 | &rbd_dev->header_oloc, "get_size", |
| 5646 | &snapid, sizeof(snapid), |
| 5647 | &size_buf, sizeof(size_buf)); |
| 5648 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 5649 | if (ret < 0) |
| 5650 | return ret; |
| 5651 | if (ret < sizeof (size_buf)) |
| 5652 | return -ERANGE; |
| 5653 | |
| 5654 | if (order) { |
| 5655 | *order = size_buf.order; |
| 5656 | dout(" order %u", (unsigned int)*order); |
| 5657 | } |
| 5658 | *snap_size = le64_to_cpu(size_buf.size); |
| 5659 | |
| 5660 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
| 5661 | (unsigned long long)snap_id, |
| 5662 | (unsigned long long)*snap_size); |
| 5663 | |
| 5664 | return 0; |
| 5665 | } |
| 5666 | |
| 5667 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) |
| 5668 | { |
| 5669 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, |
| 5670 | &rbd_dev->header.obj_order, |
| 5671 | &rbd_dev->header.image_size); |
| 5672 | } |
| 5673 | |
| 5674 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
| 5675 | { |
| 5676 | size_t size; |
| 5677 | void *reply_buf; |
| 5678 | int ret; |
| 5679 | void *p; |
| 5680 | |
| 5681 | /* Response will be an encoded string, which includes a length */ |
| 5682 | size = sizeof(__le32) + RBD_OBJ_PREFIX_LEN_MAX; |
| 5683 | reply_buf = kzalloc(size, GFP_KERNEL); |
| 5684 | if (!reply_buf) |
| 5685 | return -ENOMEM; |
| 5686 | |
| 5687 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 5688 | &rbd_dev->header_oloc, "get_object_prefix", |
| 5689 | NULL, 0, reply_buf, size); |
| 5690 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 5691 | if (ret < 0) |
| 5692 | goto out; |
| 5693 | |
| 5694 | p = reply_buf; |
| 5695 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
| 5696 | p + ret, NULL, GFP_NOIO); |
| 5697 | ret = 0; |
| 5698 | |
| 5699 | if (IS_ERR(rbd_dev->header.object_prefix)) { |
| 5700 | ret = PTR_ERR(rbd_dev->header.object_prefix); |
| 5701 | rbd_dev->header.object_prefix = NULL; |
| 5702 | } else { |
| 5703 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); |
| 5704 | } |
| 5705 | out: |
| 5706 | kfree(reply_buf); |
| 5707 | |
| 5708 | return ret; |
| 5709 | } |
| 5710 | |
| 5711 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| 5712 | u64 *snap_features) |
| 5713 | { |
| 5714 | __le64 snapid = cpu_to_le64(snap_id); |
| 5715 | struct { |
| 5716 | __le64 features; |
| 5717 | __le64 incompat; |
| 5718 | } __attribute__ ((packed)) features_buf = { 0 }; |
| 5719 | u64 unsup; |
| 5720 | int ret; |
| 5721 | |
| 5722 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 5723 | &rbd_dev->header_oloc, "get_features", |
| 5724 | &snapid, sizeof(snapid), |
| 5725 | &features_buf, sizeof(features_buf)); |
| 5726 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 5727 | if (ret < 0) |
| 5728 | return ret; |
| 5729 | if (ret < sizeof (features_buf)) |
| 5730 | return -ERANGE; |
| 5731 | |
| 5732 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
| 5733 | if (unsup) { |
| 5734 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", |
| 5735 | unsup); |
| 5736 | return -ENXIO; |
| 5737 | } |
| 5738 | |
| 5739 | *snap_features = le64_to_cpu(features_buf.features); |
| 5740 | |
| 5741 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", |
| 5742 | (unsigned long long)snap_id, |
| 5743 | (unsigned long long)*snap_features, |
| 5744 | (unsigned long long)le64_to_cpu(features_buf.incompat)); |
| 5745 | |
| 5746 | return 0; |
| 5747 | } |
| 5748 | |
| 5749 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) |
| 5750 | { |
| 5751 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, |
| 5752 | &rbd_dev->header.features); |
| 5753 | } |
| 5754 | |
| 5755 | /* |
| 5756 | * These are generic image flags, but since they are used only for |
| 5757 | * object map, store them in rbd_dev->object_map_flags. |
| 5758 | * |
| 5759 | * For the same reason, this function is called only on object map |
| 5760 | * (re)load and not on header refresh. |
| 5761 | */ |
| 5762 | static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev) |
| 5763 | { |
| 5764 | __le64 snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
| 5765 | __le64 flags; |
| 5766 | int ret; |
| 5767 | |
| 5768 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 5769 | &rbd_dev->header_oloc, "get_flags", |
| 5770 | &snapid, sizeof(snapid), |
| 5771 | &flags, sizeof(flags)); |
| 5772 | if (ret < 0) |
| 5773 | return ret; |
| 5774 | if (ret < sizeof(flags)) |
| 5775 | return -EBADMSG; |
| 5776 | |
| 5777 | rbd_dev->object_map_flags = le64_to_cpu(flags); |
| 5778 | return 0; |
| 5779 | } |
| 5780 | |
| 5781 | struct parent_image_info { |
| 5782 | u64 pool_id; |
| 5783 | const char *pool_ns; |
| 5784 | const char *image_id; |
| 5785 | u64 snap_id; |
| 5786 | |
| 5787 | bool has_overlap; |
| 5788 | u64 overlap; |
| 5789 | }; |
| 5790 | |
| 5791 | /* |
| 5792 | * The caller is responsible for @pii. |
| 5793 | */ |
| 5794 | static int decode_parent_image_spec(void **p, void *end, |
| 5795 | struct parent_image_info *pii) |
| 5796 | { |
| 5797 | u8 struct_v; |
| 5798 | u32 struct_len; |
| 5799 | int ret; |
| 5800 | |
| 5801 | ret = ceph_start_decoding(p, end, 1, "ParentImageSpec", |
| 5802 | &struct_v, &struct_len); |
| 5803 | if (ret) |
| 5804 | return ret; |
| 5805 | |
| 5806 | ceph_decode_64_safe(p, end, pii->pool_id, e_inval); |
| 5807 | pii->pool_ns = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); |
| 5808 | if (IS_ERR(pii->pool_ns)) { |
| 5809 | ret = PTR_ERR(pii->pool_ns); |
| 5810 | pii->pool_ns = NULL; |
| 5811 | return ret; |
| 5812 | } |
| 5813 | pii->image_id = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); |
| 5814 | if (IS_ERR(pii->image_id)) { |
| 5815 | ret = PTR_ERR(pii->image_id); |
| 5816 | pii->image_id = NULL; |
| 5817 | return ret; |
| 5818 | } |
| 5819 | ceph_decode_64_safe(p, end, pii->snap_id, e_inval); |
| 5820 | return 0; |
| 5821 | |
| 5822 | e_inval: |
| 5823 | return -EINVAL; |
| 5824 | } |
| 5825 | |
| 5826 | static int __get_parent_info(struct rbd_device *rbd_dev, |
| 5827 | struct page *req_page, |
| 5828 | struct page *reply_page, |
| 5829 | struct parent_image_info *pii) |
| 5830 | { |
| 5831 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 5832 | size_t reply_len = PAGE_SIZE; |
| 5833 | void *p, *end; |
| 5834 | int ret; |
| 5835 | |
| 5836 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| 5837 | "rbd", "parent_get", CEPH_OSD_FLAG_READ, |
| 5838 | req_page, sizeof(u64), &reply_page, &reply_len); |
| 5839 | if (ret) |
| 5840 | return ret == -EOPNOTSUPP ? 1 : ret; |
| 5841 | |
| 5842 | p = page_address(reply_page); |
| 5843 | end = p + reply_len; |
| 5844 | ret = decode_parent_image_spec(&p, end, pii); |
| 5845 | if (ret) |
| 5846 | return ret; |
| 5847 | |
| 5848 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| 5849 | "rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ, |
| 5850 | req_page, sizeof(u64), &reply_page, &reply_len); |
| 5851 | if (ret) |
| 5852 | return ret; |
| 5853 | |
| 5854 | p = page_address(reply_page); |
| 5855 | end = p + reply_len; |
| 5856 | ceph_decode_8_safe(&p, end, pii->has_overlap, e_inval); |
| 5857 | if (pii->has_overlap) |
| 5858 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
| 5859 | |
| 5860 | return 0; |
| 5861 | |
| 5862 | e_inval: |
| 5863 | return -EINVAL; |
| 5864 | } |
| 5865 | |
| 5866 | /* |
| 5867 | * The caller is responsible for @pii. |
| 5868 | */ |
| 5869 | static int __get_parent_info_legacy(struct rbd_device *rbd_dev, |
| 5870 | struct page *req_page, |
| 5871 | struct page *reply_page, |
| 5872 | struct parent_image_info *pii) |
| 5873 | { |
| 5874 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 5875 | size_t reply_len = PAGE_SIZE; |
| 5876 | void *p, *end; |
| 5877 | int ret; |
| 5878 | |
| 5879 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| 5880 | "rbd", "get_parent", CEPH_OSD_FLAG_READ, |
| 5881 | req_page, sizeof(u64), &reply_page, &reply_len); |
| 5882 | if (ret) |
| 5883 | return ret; |
| 5884 | |
| 5885 | p = page_address(reply_page); |
| 5886 | end = p + reply_len; |
| 5887 | ceph_decode_64_safe(&p, end, pii->pool_id, e_inval); |
| 5888 | pii->image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| 5889 | if (IS_ERR(pii->image_id)) { |
| 5890 | ret = PTR_ERR(pii->image_id); |
| 5891 | pii->image_id = NULL; |
| 5892 | return ret; |
| 5893 | } |
| 5894 | ceph_decode_64_safe(&p, end, pii->snap_id, e_inval); |
| 5895 | pii->has_overlap = true; |
| 5896 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
| 5897 | |
| 5898 | return 0; |
| 5899 | |
| 5900 | e_inval: |
| 5901 | return -EINVAL; |
| 5902 | } |
| 5903 | |
| 5904 | static int get_parent_info(struct rbd_device *rbd_dev, |
| 5905 | struct parent_image_info *pii) |
| 5906 | { |
| 5907 | struct page *req_page, *reply_page; |
| 5908 | void *p; |
| 5909 | int ret; |
| 5910 | |
| 5911 | req_page = alloc_page(GFP_KERNEL); |
| 5912 | if (!req_page) |
| 5913 | return -ENOMEM; |
| 5914 | |
| 5915 | reply_page = alloc_page(GFP_KERNEL); |
| 5916 | if (!reply_page) { |
| 5917 | __free_page(req_page); |
| 5918 | return -ENOMEM; |
| 5919 | } |
| 5920 | |
| 5921 | p = page_address(req_page); |
| 5922 | ceph_encode_64(&p, rbd_dev->spec->snap_id); |
| 5923 | ret = __get_parent_info(rbd_dev, req_page, reply_page, pii); |
| 5924 | if (ret > 0) |
| 5925 | ret = __get_parent_info_legacy(rbd_dev, req_page, reply_page, |
| 5926 | pii); |
| 5927 | |
| 5928 | __free_page(req_page); |
| 5929 | __free_page(reply_page); |
| 5930 | return ret; |
| 5931 | } |
| 5932 | |
| 5933 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
| 5934 | { |
| 5935 | struct rbd_spec *parent_spec; |
| 5936 | struct parent_image_info pii = { 0 }; |
| 5937 | int ret; |
| 5938 | |
| 5939 | parent_spec = rbd_spec_alloc(); |
| 5940 | if (!parent_spec) |
| 5941 | return -ENOMEM; |
| 5942 | |
| 5943 | ret = get_parent_info(rbd_dev, &pii); |
| 5944 | if (ret) |
| 5945 | goto out_err; |
| 5946 | |
| 5947 | dout("%s pool_id %llu pool_ns %s image_id %s snap_id %llu has_overlap %d overlap %llu\n", |
| 5948 | __func__, pii.pool_id, pii.pool_ns, pii.image_id, pii.snap_id, |
| 5949 | pii.has_overlap, pii.overlap); |
| 5950 | |
| 5951 | if (pii.pool_id == CEPH_NOPOOL || !pii.has_overlap) { |
| 5952 | /* |
| 5953 | * Either the parent never existed, or we have |
| 5954 | * record of it but the image got flattened so it no |
| 5955 | * longer has a parent. When the parent of a |
| 5956 | * layered image disappears we immediately set the |
| 5957 | * overlap to 0. The effect of this is that all new |
| 5958 | * requests will be treated as if the image had no |
| 5959 | * parent. |
| 5960 | * |
| 5961 | * If !pii.has_overlap, the parent image spec is not |
| 5962 | * applicable. It's there to avoid duplication in each |
| 5963 | * snapshot record. |
| 5964 | */ |
| 5965 | if (rbd_dev->parent_overlap) { |
| 5966 | rbd_dev->parent_overlap = 0; |
| 5967 | rbd_dev_parent_put(rbd_dev); |
| 5968 | pr_info("%s: clone image has been flattened\n", |
| 5969 | rbd_dev->disk->disk_name); |
| 5970 | } |
| 5971 | |
| 5972 | goto out; /* No parent? No problem. */ |
| 5973 | } |
| 5974 | |
| 5975 | /* The ceph file layout needs to fit pool id in 32 bits */ |
| 5976 | |
| 5977 | ret = -EIO; |
| 5978 | if (pii.pool_id > (u64)U32_MAX) { |
| 5979 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
| 5980 | (unsigned long long)pii.pool_id, U32_MAX); |
| 5981 | goto out_err; |
| 5982 | } |
| 5983 | |
| 5984 | /* |
| 5985 | * The parent won't change (except when the clone is |
| 5986 | * flattened, already handled that). So we only need to |
| 5987 | * record the parent spec we have not already done so. |
| 5988 | */ |
| 5989 | if (!rbd_dev->parent_spec) { |
| 5990 | parent_spec->pool_id = pii.pool_id; |
| 5991 | if (pii.pool_ns && *pii.pool_ns) { |
| 5992 | parent_spec->pool_ns = pii.pool_ns; |
| 5993 | pii.pool_ns = NULL; |
| 5994 | } |
| 5995 | parent_spec->image_id = pii.image_id; |
| 5996 | pii.image_id = NULL; |
| 5997 | parent_spec->snap_id = pii.snap_id; |
| 5998 | |
| 5999 | rbd_dev->parent_spec = parent_spec; |
| 6000 | parent_spec = NULL; /* rbd_dev now owns this */ |
| 6001 | } |
| 6002 | |
| 6003 | /* |
| 6004 | * We always update the parent overlap. If it's zero we issue |
| 6005 | * a warning, as we will proceed as if there was no parent. |
| 6006 | */ |
| 6007 | if (!pii.overlap) { |
| 6008 | if (parent_spec) { |
| 6009 | /* refresh, careful to warn just once */ |
| 6010 | if (rbd_dev->parent_overlap) |
| 6011 | rbd_warn(rbd_dev, |
| 6012 | "clone now standalone (overlap became 0)"); |
| 6013 | } else { |
| 6014 | /* initial probe */ |
| 6015 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); |
| 6016 | } |
| 6017 | } |
| 6018 | rbd_dev->parent_overlap = pii.overlap; |
| 6019 | |
| 6020 | out: |
| 6021 | ret = 0; |
| 6022 | out_err: |
| 6023 | kfree(pii.pool_ns); |
| 6024 | kfree(pii.image_id); |
| 6025 | rbd_spec_put(parent_spec); |
| 6026 | return ret; |
| 6027 | } |
| 6028 | |
| 6029 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
| 6030 | { |
| 6031 | struct { |
| 6032 | __le64 stripe_unit; |
| 6033 | __le64 stripe_count; |
| 6034 | } __attribute__ ((packed)) striping_info_buf = { 0 }; |
| 6035 | size_t size = sizeof (striping_info_buf); |
| 6036 | void *p; |
| 6037 | int ret; |
| 6038 | |
| 6039 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 6040 | &rbd_dev->header_oloc, "get_stripe_unit_count", |
| 6041 | NULL, 0, &striping_info_buf, size); |
| 6042 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 6043 | if (ret < 0) |
| 6044 | return ret; |
| 6045 | if (ret < size) |
| 6046 | return -ERANGE; |
| 6047 | |
| 6048 | p = &striping_info_buf; |
| 6049 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
| 6050 | rbd_dev->header.stripe_count = ceph_decode_64(&p); |
| 6051 | return 0; |
| 6052 | } |
| 6053 | |
| 6054 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
| 6055 | { |
| 6056 | __le64 data_pool_id; |
| 6057 | int ret; |
| 6058 | |
| 6059 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 6060 | &rbd_dev->header_oloc, "get_data_pool", |
| 6061 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); |
| 6062 | if (ret < 0) |
| 6063 | return ret; |
| 6064 | if (ret < sizeof(data_pool_id)) |
| 6065 | return -EBADMSG; |
| 6066 | |
| 6067 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); |
| 6068 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); |
| 6069 | return 0; |
| 6070 | } |
| 6071 | |
| 6072 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
| 6073 | { |
| 6074 | CEPH_DEFINE_OID_ONSTACK(oid); |
| 6075 | size_t image_id_size; |
| 6076 | char *image_id; |
| 6077 | void *p; |
| 6078 | void *end; |
| 6079 | size_t size; |
| 6080 | void *reply_buf = NULL; |
| 6081 | size_t len = 0; |
| 6082 | char *image_name = NULL; |
| 6083 | int ret; |
| 6084 | |
| 6085 | rbd_assert(!rbd_dev->spec->image_name); |
| 6086 | |
| 6087 | len = strlen(rbd_dev->spec->image_id); |
| 6088 | image_id_size = sizeof (__le32) + len; |
| 6089 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
| 6090 | if (!image_id) |
| 6091 | return NULL; |
| 6092 | |
| 6093 | p = image_id; |
| 6094 | end = image_id + image_id_size; |
| 6095 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
| 6096 | |
| 6097 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; |
| 6098 | reply_buf = kmalloc(size, GFP_KERNEL); |
| 6099 | if (!reply_buf) |
| 6100 | goto out; |
| 6101 | |
| 6102 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
| 6103 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
| 6104 | "dir_get_name", image_id, image_id_size, |
| 6105 | reply_buf, size); |
| 6106 | if (ret < 0) |
| 6107 | goto out; |
| 6108 | p = reply_buf; |
| 6109 | end = reply_buf + ret; |
| 6110 | |
| 6111 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
| 6112 | if (IS_ERR(image_name)) |
| 6113 | image_name = NULL; |
| 6114 | else |
| 6115 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); |
| 6116 | out: |
| 6117 | kfree(reply_buf); |
| 6118 | kfree(image_id); |
| 6119 | |
| 6120 | return image_name; |
| 6121 | } |
| 6122 | |
| 6123 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 6124 | { |
| 6125 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| 6126 | const char *snap_name; |
| 6127 | u32 which = 0; |
| 6128 | |
| 6129 | /* Skip over names until we find the one we are looking for */ |
| 6130 | |
| 6131 | snap_name = rbd_dev->header.snap_names; |
| 6132 | while (which < snapc->num_snaps) { |
| 6133 | if (!strcmp(name, snap_name)) |
| 6134 | return snapc->snaps[which]; |
| 6135 | snap_name += strlen(snap_name) + 1; |
| 6136 | which++; |
| 6137 | } |
| 6138 | return CEPH_NOSNAP; |
| 6139 | } |
| 6140 | |
| 6141 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 6142 | { |
| 6143 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| 6144 | u32 which; |
| 6145 | bool found = false; |
| 6146 | u64 snap_id; |
| 6147 | |
| 6148 | for (which = 0; !found && which < snapc->num_snaps; which++) { |
| 6149 | const char *snap_name; |
| 6150 | |
| 6151 | snap_id = snapc->snaps[which]; |
| 6152 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); |
| 6153 | if (IS_ERR(snap_name)) { |
| 6154 | /* ignore no-longer existing snapshots */ |
| 6155 | if (PTR_ERR(snap_name) == -ENOENT) |
| 6156 | continue; |
| 6157 | else |
| 6158 | break; |
| 6159 | } |
| 6160 | found = !strcmp(name, snap_name); |
| 6161 | kfree(snap_name); |
| 6162 | } |
| 6163 | return found ? snap_id : CEPH_NOSNAP; |
| 6164 | } |
| 6165 | |
| 6166 | /* |
| 6167 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if |
| 6168 | * no snapshot by that name is found, or if an error occurs. |
| 6169 | */ |
| 6170 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| 6171 | { |
| 6172 | if (rbd_dev->image_format == 1) |
| 6173 | return rbd_v1_snap_id_by_name(rbd_dev, name); |
| 6174 | |
| 6175 | return rbd_v2_snap_id_by_name(rbd_dev, name); |
| 6176 | } |
| 6177 | |
| 6178 | /* |
| 6179 | * An image being mapped will have everything but the snap id. |
| 6180 | */ |
| 6181 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) |
| 6182 | { |
| 6183 | struct rbd_spec *spec = rbd_dev->spec; |
| 6184 | |
| 6185 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); |
| 6186 | rbd_assert(spec->image_id && spec->image_name); |
| 6187 | rbd_assert(spec->snap_name); |
| 6188 | |
| 6189 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { |
| 6190 | u64 snap_id; |
| 6191 | |
| 6192 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
| 6193 | if (snap_id == CEPH_NOSNAP) |
| 6194 | return -ENOENT; |
| 6195 | |
| 6196 | spec->snap_id = snap_id; |
| 6197 | } else { |
| 6198 | spec->snap_id = CEPH_NOSNAP; |
| 6199 | } |
| 6200 | |
| 6201 | return 0; |
| 6202 | } |
| 6203 | |
| 6204 | /* |
| 6205 | * A parent image will have all ids but none of the names. |
| 6206 | * |
| 6207 | * All names in an rbd spec are dynamically allocated. It's OK if we |
| 6208 | * can't figure out the name for an image id. |
| 6209 | */ |
| 6210 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
| 6211 | { |
| 6212 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| 6213 | struct rbd_spec *spec = rbd_dev->spec; |
| 6214 | const char *pool_name; |
| 6215 | const char *image_name; |
| 6216 | const char *snap_name; |
| 6217 | int ret; |
| 6218 | |
| 6219 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
| 6220 | rbd_assert(spec->image_id); |
| 6221 | rbd_assert(spec->snap_id != CEPH_NOSNAP); |
| 6222 | |
| 6223 | /* Get the pool name; we have to make our own copy of this */ |
| 6224 | |
| 6225 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
| 6226 | if (!pool_name) { |
| 6227 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); |
| 6228 | return -EIO; |
| 6229 | } |
| 6230 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
| 6231 | if (!pool_name) |
| 6232 | return -ENOMEM; |
| 6233 | |
| 6234 | /* Fetch the image name; tolerate failure here */ |
| 6235 | |
| 6236 | image_name = rbd_dev_image_name(rbd_dev); |
| 6237 | if (!image_name) |
| 6238 | rbd_warn(rbd_dev, "unable to get image name"); |
| 6239 | |
| 6240 | /* Fetch the snapshot name */ |
| 6241 | |
| 6242 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
| 6243 | if (IS_ERR(snap_name)) { |
| 6244 | ret = PTR_ERR(snap_name); |
| 6245 | goto out_err; |
| 6246 | } |
| 6247 | |
| 6248 | spec->pool_name = pool_name; |
| 6249 | spec->image_name = image_name; |
| 6250 | spec->snap_name = snap_name; |
| 6251 | |
| 6252 | return 0; |
| 6253 | |
| 6254 | out_err: |
| 6255 | kfree(image_name); |
| 6256 | kfree(pool_name); |
| 6257 | return ret; |
| 6258 | } |
| 6259 | |
| 6260 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
| 6261 | { |
| 6262 | size_t size; |
| 6263 | int ret; |
| 6264 | void *reply_buf; |
| 6265 | void *p; |
| 6266 | void *end; |
| 6267 | u64 seq; |
| 6268 | u32 snap_count; |
| 6269 | struct ceph_snap_context *snapc; |
| 6270 | u32 i; |
| 6271 | |
| 6272 | /* |
| 6273 | * We'll need room for the seq value (maximum snapshot id), |
| 6274 | * snapshot count, and array of that many snapshot ids. |
| 6275 | * For now we have a fixed upper limit on the number we're |
| 6276 | * prepared to receive. |
| 6277 | */ |
| 6278 | size = sizeof (__le64) + sizeof (__le32) + |
| 6279 | RBD_MAX_SNAP_COUNT * sizeof (__le64); |
| 6280 | reply_buf = kzalloc(size, GFP_KERNEL); |
| 6281 | if (!reply_buf) |
| 6282 | return -ENOMEM; |
| 6283 | |
| 6284 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 6285 | &rbd_dev->header_oloc, "get_snapcontext", |
| 6286 | NULL, 0, reply_buf, size); |
| 6287 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 6288 | if (ret < 0) |
| 6289 | goto out; |
| 6290 | |
| 6291 | p = reply_buf; |
| 6292 | end = reply_buf + ret; |
| 6293 | ret = -ERANGE; |
| 6294 | ceph_decode_64_safe(&p, end, seq, out); |
| 6295 | ceph_decode_32_safe(&p, end, snap_count, out); |
| 6296 | |
| 6297 | /* |
| 6298 | * Make sure the reported number of snapshot ids wouldn't go |
| 6299 | * beyond the end of our buffer. But before checking that, |
| 6300 | * make sure the computed size of the snapshot context we |
| 6301 | * allocate is representable in a size_t. |
| 6302 | */ |
| 6303 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) |
| 6304 | / sizeof (u64)) { |
| 6305 | ret = -EINVAL; |
| 6306 | goto out; |
| 6307 | } |
| 6308 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) |
| 6309 | goto out; |
| 6310 | ret = 0; |
| 6311 | |
| 6312 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
| 6313 | if (!snapc) { |
| 6314 | ret = -ENOMEM; |
| 6315 | goto out; |
| 6316 | } |
| 6317 | snapc->seq = seq; |
| 6318 | for (i = 0; i < snap_count; i++) |
| 6319 | snapc->snaps[i] = ceph_decode_64(&p); |
| 6320 | |
| 6321 | ceph_put_snap_context(rbd_dev->header.snapc); |
| 6322 | rbd_dev->header.snapc = snapc; |
| 6323 | |
| 6324 | dout(" snap context seq = %llu, snap_count = %u\n", |
| 6325 | (unsigned long long)seq, (unsigned int)snap_count); |
| 6326 | out: |
| 6327 | kfree(reply_buf); |
| 6328 | |
| 6329 | return ret; |
| 6330 | } |
| 6331 | |
| 6332 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| 6333 | u64 snap_id) |
| 6334 | { |
| 6335 | size_t size; |
| 6336 | void *reply_buf; |
| 6337 | __le64 snapid; |
| 6338 | int ret; |
| 6339 | void *p; |
| 6340 | void *end; |
| 6341 | char *snap_name; |
| 6342 | |
| 6343 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; |
| 6344 | reply_buf = kmalloc(size, GFP_KERNEL); |
| 6345 | if (!reply_buf) |
| 6346 | return ERR_PTR(-ENOMEM); |
| 6347 | |
| 6348 | snapid = cpu_to_le64(snap_id); |
| 6349 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| 6350 | &rbd_dev->header_oloc, "get_snapshot_name", |
| 6351 | &snapid, sizeof(snapid), reply_buf, size); |
| 6352 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 6353 | if (ret < 0) { |
| 6354 | snap_name = ERR_PTR(ret); |
| 6355 | goto out; |
| 6356 | } |
| 6357 | |
| 6358 | p = reply_buf; |
| 6359 | end = reply_buf + ret; |
| 6360 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| 6361 | if (IS_ERR(snap_name)) |
| 6362 | goto out; |
| 6363 | |
| 6364 | dout(" snap_id 0x%016llx snap_name = %s\n", |
| 6365 | (unsigned long long)snap_id, snap_name); |
| 6366 | out: |
| 6367 | kfree(reply_buf); |
| 6368 | |
| 6369 | return snap_name; |
| 6370 | } |
| 6371 | |
| 6372 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
| 6373 | { |
| 6374 | bool first_time = rbd_dev->header.object_prefix == NULL; |
| 6375 | int ret; |
| 6376 | |
| 6377 | ret = rbd_dev_v2_image_size(rbd_dev); |
| 6378 | if (ret) |
| 6379 | return ret; |
| 6380 | |
| 6381 | if (first_time) { |
| 6382 | ret = rbd_dev_v2_header_onetime(rbd_dev); |
| 6383 | if (ret) |
| 6384 | return ret; |
| 6385 | } |
| 6386 | |
| 6387 | ret = rbd_dev_v2_snap_context(rbd_dev); |
| 6388 | if (ret && first_time) { |
| 6389 | kfree(rbd_dev->header.object_prefix); |
| 6390 | rbd_dev->header.object_prefix = NULL; |
| 6391 | } |
| 6392 | |
| 6393 | return ret; |
| 6394 | } |
| 6395 | |
| 6396 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
| 6397 | { |
| 6398 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 6399 | |
| 6400 | if (rbd_dev->image_format == 1) |
| 6401 | return rbd_dev_v1_header_info(rbd_dev); |
| 6402 | |
| 6403 | return rbd_dev_v2_header_info(rbd_dev); |
| 6404 | } |
| 6405 | |
| 6406 | /* |
| 6407 | * Skips over white space at *buf, and updates *buf to point to the |
| 6408 | * first found non-space character (if any). Returns the length of |
| 6409 | * the token (string of non-white space characters) found. Note |
| 6410 | * that *buf must be terminated with '\0'. |
| 6411 | */ |
| 6412 | static inline size_t next_token(const char **buf) |
| 6413 | { |
| 6414 | /* |
| 6415 | * These are the characters that produce nonzero for |
| 6416 | * isspace() in the "C" and "POSIX" locales. |
| 6417 | */ |
| 6418 | const char *spaces = " \f\n\r\t\v"; |
| 6419 | |
| 6420 | *buf += strspn(*buf, spaces); /* Find start of token */ |
| 6421 | |
| 6422 | return strcspn(*buf, spaces); /* Return token length */ |
| 6423 | } |
| 6424 | |
| 6425 | /* |
| 6426 | * Finds the next token in *buf, dynamically allocates a buffer big |
| 6427 | * enough to hold a copy of it, and copies the token into the new |
| 6428 | * buffer. The copy is guaranteed to be terminated with '\0'. Note |
| 6429 | * that a duplicate buffer is created even for a zero-length token. |
| 6430 | * |
| 6431 | * Returns a pointer to the newly-allocated duplicate, or a null |
| 6432 | * pointer if memory for the duplicate was not available. If |
| 6433 | * the lenp argument is a non-null pointer, the length of the token |
| 6434 | * (not including the '\0') is returned in *lenp. |
| 6435 | * |
| 6436 | * If successful, the *buf pointer will be updated to point beyond |
| 6437 | * the end of the found token. |
| 6438 | * |
| 6439 | * Note: uses GFP_KERNEL for allocation. |
| 6440 | */ |
| 6441 | static inline char *dup_token(const char **buf, size_t *lenp) |
| 6442 | { |
| 6443 | char *dup; |
| 6444 | size_t len; |
| 6445 | |
| 6446 | len = next_token(buf); |
| 6447 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
| 6448 | if (!dup) |
| 6449 | return NULL; |
| 6450 | *(dup + len) = '\0'; |
| 6451 | *buf += len; |
| 6452 | |
| 6453 | if (lenp) |
| 6454 | *lenp = len; |
| 6455 | |
| 6456 | return dup; |
| 6457 | } |
| 6458 | |
| 6459 | /* |
| 6460 | * Parse the options provided for an "rbd add" (i.e., rbd image |
| 6461 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, |
| 6462 | * and the data written is passed here via a NUL-terminated buffer. |
| 6463 | * Returns 0 if successful or an error code otherwise. |
| 6464 | * |
| 6465 | * The information extracted from these options is recorded in |
| 6466 | * the other parameters which return dynamically-allocated |
| 6467 | * structures: |
| 6468 | * ceph_opts |
| 6469 | * The address of a pointer that will refer to a ceph options |
| 6470 | * structure. Caller must release the returned pointer using |
| 6471 | * ceph_destroy_options() when it is no longer needed. |
| 6472 | * rbd_opts |
| 6473 | * Address of an rbd options pointer. Fully initialized by |
| 6474 | * this function; caller must release with kfree(). |
| 6475 | * spec |
| 6476 | * Address of an rbd image specification pointer. Fully |
| 6477 | * initialized by this function based on parsed options. |
| 6478 | * Caller must release with rbd_spec_put(). |
| 6479 | * |
| 6480 | * The options passed take this form: |
| 6481 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] |
| 6482 | * where: |
| 6483 | * <mon_addrs> |
| 6484 | * A comma-separated list of one or more monitor addresses. |
| 6485 | * A monitor address is an ip address, optionally followed |
| 6486 | * by a port number (separated by a colon). |
| 6487 | * I.e.: ip1[:port1][,ip2[:port2]...] |
| 6488 | * <options> |
| 6489 | * A comma-separated list of ceph and/or rbd options. |
| 6490 | * <pool_name> |
| 6491 | * The name of the rados pool containing the rbd image. |
| 6492 | * <image_name> |
| 6493 | * The name of the image in that pool to map. |
| 6494 | * <snap_id> |
| 6495 | * An optional snapshot id. If provided, the mapping will |
| 6496 | * present data from the image at the time that snapshot was |
| 6497 | * created. The image head is used if no snapshot id is |
| 6498 | * provided. Snapshot mappings are always read-only. |
| 6499 | */ |
| 6500 | static int rbd_add_parse_args(const char *buf, |
| 6501 | struct ceph_options **ceph_opts, |
| 6502 | struct rbd_options **opts, |
| 6503 | struct rbd_spec **rbd_spec) |
| 6504 | { |
| 6505 | size_t len; |
| 6506 | char *options; |
| 6507 | const char *mon_addrs; |
| 6508 | char *snap_name; |
| 6509 | size_t mon_addrs_size; |
| 6510 | struct parse_rbd_opts_ctx pctx = { 0 }; |
| 6511 | struct ceph_options *copts; |
| 6512 | int ret; |
| 6513 | |
| 6514 | /* The first four tokens are required */ |
| 6515 | |
| 6516 | len = next_token(&buf); |
| 6517 | if (!len) { |
| 6518 | rbd_warn(NULL, "no monitor address(es) provided"); |
| 6519 | return -EINVAL; |
| 6520 | } |
| 6521 | mon_addrs = buf; |
| 6522 | mon_addrs_size = len + 1; |
| 6523 | buf += len; |
| 6524 | |
| 6525 | ret = -EINVAL; |
| 6526 | options = dup_token(&buf, NULL); |
| 6527 | if (!options) |
| 6528 | return -ENOMEM; |
| 6529 | if (!*options) { |
| 6530 | rbd_warn(NULL, "no options provided"); |
| 6531 | goto out_err; |
| 6532 | } |
| 6533 | |
| 6534 | pctx.spec = rbd_spec_alloc(); |
| 6535 | if (!pctx.spec) |
| 6536 | goto out_mem; |
| 6537 | |
| 6538 | pctx.spec->pool_name = dup_token(&buf, NULL); |
| 6539 | if (!pctx.spec->pool_name) |
| 6540 | goto out_mem; |
| 6541 | if (!*pctx.spec->pool_name) { |
| 6542 | rbd_warn(NULL, "no pool name provided"); |
| 6543 | goto out_err; |
| 6544 | } |
| 6545 | |
| 6546 | pctx.spec->image_name = dup_token(&buf, NULL); |
| 6547 | if (!pctx.spec->image_name) |
| 6548 | goto out_mem; |
| 6549 | if (!*pctx.spec->image_name) { |
| 6550 | rbd_warn(NULL, "no image name provided"); |
| 6551 | goto out_err; |
| 6552 | } |
| 6553 | |
| 6554 | /* |
| 6555 | * Snapshot name is optional; default is to use "-" |
| 6556 | * (indicating the head/no snapshot). |
| 6557 | */ |
| 6558 | len = next_token(&buf); |
| 6559 | if (!len) { |
| 6560 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
| 6561 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; |
| 6562 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
| 6563 | ret = -ENAMETOOLONG; |
| 6564 | goto out_err; |
| 6565 | } |
| 6566 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
| 6567 | if (!snap_name) |
| 6568 | goto out_mem; |
| 6569 | *(snap_name + len) = '\0'; |
| 6570 | pctx.spec->snap_name = snap_name; |
| 6571 | |
| 6572 | /* Initialize all rbd options to the defaults */ |
| 6573 | |
| 6574 | pctx.opts = kzalloc(sizeof(*pctx.opts), GFP_KERNEL); |
| 6575 | if (!pctx.opts) |
| 6576 | goto out_mem; |
| 6577 | |
| 6578 | pctx.opts->read_only = RBD_READ_ONLY_DEFAULT; |
| 6579 | pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
| 6580 | pctx.opts->alloc_size = RBD_ALLOC_SIZE_DEFAULT; |
| 6581 | pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; |
| 6582 | pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
| 6583 | pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
| 6584 | pctx.opts->trim = RBD_TRIM_DEFAULT; |
| 6585 | |
| 6586 | copts = ceph_parse_options(options, mon_addrs, |
| 6587 | mon_addrs + mon_addrs_size - 1, |
| 6588 | parse_rbd_opts_token, &pctx); |
| 6589 | if (IS_ERR(copts)) { |
| 6590 | ret = PTR_ERR(copts); |
| 6591 | goto out_err; |
| 6592 | } |
| 6593 | kfree(options); |
| 6594 | |
| 6595 | *ceph_opts = copts; |
| 6596 | *opts = pctx.opts; |
| 6597 | *rbd_spec = pctx.spec; |
| 6598 | |
| 6599 | return 0; |
| 6600 | out_mem: |
| 6601 | ret = -ENOMEM; |
| 6602 | out_err: |
| 6603 | kfree(pctx.opts); |
| 6604 | rbd_spec_put(pctx.spec); |
| 6605 | kfree(options); |
| 6606 | |
| 6607 | return ret; |
| 6608 | } |
| 6609 | |
| 6610 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
| 6611 | { |
| 6612 | down_write(&rbd_dev->lock_rwsem); |
| 6613 | if (__rbd_is_lock_owner(rbd_dev)) |
| 6614 | __rbd_release_lock(rbd_dev); |
| 6615 | up_write(&rbd_dev->lock_rwsem); |
| 6616 | } |
| 6617 | |
| 6618 | /* |
| 6619 | * If the wait is interrupted, an error is returned even if the lock |
| 6620 | * was successfully acquired. rbd_dev_image_unlock() will release it |
| 6621 | * if needed. |
| 6622 | */ |
| 6623 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) |
| 6624 | { |
| 6625 | long ret; |
| 6626 | |
| 6627 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
| 6628 | if (!rbd_dev->opts->exclusive && !rbd_dev->opts->lock_on_read) |
| 6629 | return 0; |
| 6630 | |
| 6631 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); |
| 6632 | return -EINVAL; |
| 6633 | } |
| 6634 | |
| 6635 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| 6636 | return 0; |
| 6637 | |
| 6638 | rbd_assert(!rbd_is_lock_owner(rbd_dev)); |
| 6639 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
| 6640 | ret = wait_for_completion_killable_timeout(&rbd_dev->acquire_wait, |
| 6641 | ceph_timeout_jiffies(rbd_dev->opts->lock_timeout)); |
| 6642 | if (ret > 0) |
| 6643 | ret = rbd_dev->acquire_err; |
| 6644 | else if (!ret) |
| 6645 | ret = -ETIMEDOUT; |
| 6646 | |
| 6647 | if (ret) { |
| 6648 | rbd_warn(rbd_dev, "failed to acquire exclusive lock: %ld", ret); |
| 6649 | return ret; |
| 6650 | } |
| 6651 | |
| 6652 | /* |
| 6653 | * The lock may have been released by now, unless automatic lock |
| 6654 | * transitions are disabled. |
| 6655 | */ |
| 6656 | rbd_assert(!rbd_dev->opts->exclusive || rbd_is_lock_owner(rbd_dev)); |
| 6657 | return 0; |
| 6658 | } |
| 6659 | |
| 6660 | /* |
| 6661 | * An rbd format 2 image has a unique identifier, distinct from the |
| 6662 | * name given to it by the user. Internally, that identifier is |
| 6663 | * what's used to specify the names of objects related to the image. |
| 6664 | * |
| 6665 | * A special "rbd id" object is used to map an rbd image name to its |
| 6666 | * id. If that object doesn't exist, then there is no v2 rbd image |
| 6667 | * with the supplied name. |
| 6668 | * |
| 6669 | * This function will record the given rbd_dev's image_id field if |
| 6670 | * it can be determined, and in that case will return 0. If any |
| 6671 | * errors occur a negative errno will be returned and the rbd_dev's |
| 6672 | * image_id field will be unchanged (and should be NULL). |
| 6673 | */ |
| 6674 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) |
| 6675 | { |
| 6676 | int ret; |
| 6677 | size_t size; |
| 6678 | CEPH_DEFINE_OID_ONSTACK(oid); |
| 6679 | void *response; |
| 6680 | char *image_id; |
| 6681 | |
| 6682 | /* |
| 6683 | * When probing a parent image, the image id is already |
| 6684 | * known (and the image name likely is not). There's no |
| 6685 | * need to fetch the image id again in this case. We |
| 6686 | * do still need to set the image format though. |
| 6687 | */ |
| 6688 | if (rbd_dev->spec->image_id) { |
| 6689 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; |
| 6690 | |
| 6691 | return 0; |
| 6692 | } |
| 6693 | |
| 6694 | /* |
| 6695 | * First, see if the format 2 image id file exists, and if |
| 6696 | * so, get the image's persistent id from it. |
| 6697 | */ |
| 6698 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
| 6699 | rbd_dev->spec->image_name); |
| 6700 | if (ret) |
| 6701 | return ret; |
| 6702 | |
| 6703 | dout("rbd id object name is %s\n", oid.name); |
| 6704 | |
| 6705 | /* Response will be an encoded string, which includes a length */ |
| 6706 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
| 6707 | response = kzalloc(size, GFP_NOIO); |
| 6708 | if (!response) { |
| 6709 | ret = -ENOMEM; |
| 6710 | goto out; |
| 6711 | } |
| 6712 | |
| 6713 | /* If it doesn't exist we'll assume it's a format 1 image */ |
| 6714 | |
| 6715 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
| 6716 | "get_id", NULL, 0, |
| 6717 | response, size); |
| 6718 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| 6719 | if (ret == -ENOENT) { |
| 6720 | image_id = kstrdup("", GFP_KERNEL); |
| 6721 | ret = image_id ? 0 : -ENOMEM; |
| 6722 | if (!ret) |
| 6723 | rbd_dev->image_format = 1; |
| 6724 | } else if (ret >= 0) { |
| 6725 | void *p = response; |
| 6726 | |
| 6727 | image_id = ceph_extract_encoded_string(&p, p + ret, |
| 6728 | NULL, GFP_NOIO); |
| 6729 | ret = PTR_ERR_OR_ZERO(image_id); |
| 6730 | if (!ret) |
| 6731 | rbd_dev->image_format = 2; |
| 6732 | } |
| 6733 | |
| 6734 | if (!ret) { |
| 6735 | rbd_dev->spec->image_id = image_id; |
| 6736 | dout("image_id is %s\n", image_id); |
| 6737 | } |
| 6738 | out: |
| 6739 | kfree(response); |
| 6740 | ceph_oid_destroy(&oid); |
| 6741 | return ret; |
| 6742 | } |
| 6743 | |
| 6744 | /* |
| 6745 | * Undo whatever state changes are made by v1 or v2 header info |
| 6746 | * call. |
| 6747 | */ |
| 6748 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
| 6749 | { |
| 6750 | struct rbd_image_header *header; |
| 6751 | |
| 6752 | rbd_dev_parent_put(rbd_dev); |
| 6753 | rbd_object_map_free(rbd_dev); |
| 6754 | rbd_dev_mapping_clear(rbd_dev); |
| 6755 | |
| 6756 | /* Free dynamic fields from the header, then zero it out */ |
| 6757 | |
| 6758 | header = &rbd_dev->header; |
| 6759 | ceph_put_snap_context(header->snapc); |
| 6760 | kfree(header->snap_sizes); |
| 6761 | kfree(header->snap_names); |
| 6762 | kfree(header->object_prefix); |
| 6763 | memset(header, 0, sizeof (*header)); |
| 6764 | } |
| 6765 | |
| 6766 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
| 6767 | { |
| 6768 | int ret; |
| 6769 | |
| 6770 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
| 6771 | if (ret) |
| 6772 | goto out_err; |
| 6773 | |
| 6774 | /* |
| 6775 | * Get the and check features for the image. Currently the |
| 6776 | * features are assumed to never change. |
| 6777 | */ |
| 6778 | ret = rbd_dev_v2_features(rbd_dev); |
| 6779 | if (ret) |
| 6780 | goto out_err; |
| 6781 | |
| 6782 | /* If the image supports fancy striping, get its parameters */ |
| 6783 | |
| 6784 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { |
| 6785 | ret = rbd_dev_v2_striping_info(rbd_dev); |
| 6786 | if (ret < 0) |
| 6787 | goto out_err; |
| 6788 | } |
| 6789 | |
| 6790 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
| 6791 | ret = rbd_dev_v2_data_pool(rbd_dev); |
| 6792 | if (ret) |
| 6793 | goto out_err; |
| 6794 | } |
| 6795 | |
| 6796 | rbd_init_layout(rbd_dev); |
| 6797 | return 0; |
| 6798 | |
| 6799 | out_err: |
| 6800 | rbd_dev->header.features = 0; |
| 6801 | kfree(rbd_dev->header.object_prefix); |
| 6802 | rbd_dev->header.object_prefix = NULL; |
| 6803 | return ret; |
| 6804 | } |
| 6805 | |
| 6806 | /* |
| 6807 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> |
| 6808 | * rbd_dev_image_probe() recursion depth, which means it's also the |
| 6809 | * length of the already discovered part of the parent chain. |
| 6810 | */ |
| 6811 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) |
| 6812 | { |
| 6813 | struct rbd_device *parent = NULL; |
| 6814 | int ret; |
| 6815 | |
| 6816 | if (!rbd_dev->parent_spec) |
| 6817 | return 0; |
| 6818 | |
| 6819 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
| 6820 | pr_info("parent chain is too long (%d)\n", depth); |
| 6821 | ret = -EINVAL; |
| 6822 | goto out_err; |
| 6823 | } |
| 6824 | |
| 6825 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
| 6826 | if (!parent) { |
| 6827 | ret = -ENOMEM; |
| 6828 | goto out_err; |
| 6829 | } |
| 6830 | |
| 6831 | /* |
| 6832 | * Images related by parent/child relationships always share |
| 6833 | * rbd_client and spec/parent_spec, so bump their refcounts. |
| 6834 | */ |
| 6835 | __rbd_get_client(rbd_dev->rbd_client); |
| 6836 | rbd_spec_get(rbd_dev->parent_spec); |
| 6837 | |
| 6838 | ret = rbd_dev_image_probe(parent, depth); |
| 6839 | if (ret < 0) |
| 6840 | goto out_err; |
| 6841 | |
| 6842 | rbd_dev->parent = parent; |
| 6843 | atomic_set(&rbd_dev->parent_ref, 1); |
| 6844 | return 0; |
| 6845 | |
| 6846 | out_err: |
| 6847 | rbd_dev_unparent(rbd_dev); |
| 6848 | rbd_dev_destroy(parent); |
| 6849 | return ret; |
| 6850 | } |
| 6851 | |
| 6852 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
| 6853 | { |
| 6854 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| 6855 | rbd_free_disk(rbd_dev); |
| 6856 | if (!single_major) |
| 6857 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| 6858 | } |
| 6859 | |
| 6860 | /* |
| 6861 | * rbd_dev->header_rwsem must be locked for write and will be unlocked |
| 6862 | * upon return. |
| 6863 | */ |
| 6864 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
| 6865 | { |
| 6866 | int ret; |
| 6867 | |
| 6868 | /* Record our major and minor device numbers. */ |
| 6869 | |
| 6870 | if (!single_major) { |
| 6871 | ret = register_blkdev(0, rbd_dev->name); |
| 6872 | if (ret < 0) |
| 6873 | goto err_out_unlock; |
| 6874 | |
| 6875 | rbd_dev->major = ret; |
| 6876 | rbd_dev->minor = 0; |
| 6877 | } else { |
| 6878 | rbd_dev->major = rbd_major; |
| 6879 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); |
| 6880 | } |
| 6881 | |
| 6882 | /* Set up the blkdev mapping. */ |
| 6883 | |
| 6884 | ret = rbd_init_disk(rbd_dev); |
| 6885 | if (ret) |
| 6886 | goto err_out_blkdev; |
| 6887 | |
| 6888 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
| 6889 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
| 6890 | |
| 6891 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
| 6892 | if (ret) |
| 6893 | goto err_out_disk; |
| 6894 | |
| 6895 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| 6896 | up_write(&rbd_dev->header_rwsem); |
| 6897 | return 0; |
| 6898 | |
| 6899 | err_out_disk: |
| 6900 | rbd_free_disk(rbd_dev); |
| 6901 | err_out_blkdev: |
| 6902 | if (!single_major) |
| 6903 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| 6904 | err_out_unlock: |
| 6905 | up_write(&rbd_dev->header_rwsem); |
| 6906 | return ret; |
| 6907 | } |
| 6908 | |
| 6909 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
| 6910 | { |
| 6911 | struct rbd_spec *spec = rbd_dev->spec; |
| 6912 | int ret; |
| 6913 | |
| 6914 | /* Record the header object name for this rbd image. */ |
| 6915 | |
| 6916 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| 6917 | if (rbd_dev->image_format == 1) |
| 6918 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
| 6919 | spec->image_name, RBD_SUFFIX); |
| 6920 | else |
| 6921 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
| 6922 | RBD_HEADER_PREFIX, spec->image_id); |
| 6923 | |
| 6924 | return ret; |
| 6925 | } |
| 6926 | |
| 6927 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
| 6928 | { |
| 6929 | rbd_dev_unprobe(rbd_dev); |
| 6930 | if (rbd_dev->opts) |
| 6931 | rbd_unregister_watch(rbd_dev); |
| 6932 | rbd_dev->image_format = 0; |
| 6933 | kfree(rbd_dev->spec->image_id); |
| 6934 | rbd_dev->spec->image_id = NULL; |
| 6935 | } |
| 6936 | |
| 6937 | /* |
| 6938 | * Probe for the existence of the header object for the given rbd |
| 6939 | * device. If this image is the one being mapped (i.e., not a |
| 6940 | * parent), initiate a watch on its header object before using that |
| 6941 | * object to get detailed information about the rbd image. |
| 6942 | */ |
| 6943 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
| 6944 | { |
| 6945 | int ret; |
| 6946 | |
| 6947 | /* |
| 6948 | * Get the id from the image id object. Unless there's an |
| 6949 | * error, rbd_dev->spec->image_id will be filled in with |
| 6950 | * a dynamically-allocated string, and rbd_dev->image_format |
| 6951 | * will be set to either 1 or 2. |
| 6952 | */ |
| 6953 | ret = rbd_dev_image_id(rbd_dev); |
| 6954 | if (ret) |
| 6955 | return ret; |
| 6956 | |
| 6957 | ret = rbd_dev_header_name(rbd_dev); |
| 6958 | if (ret) |
| 6959 | goto err_out_format; |
| 6960 | |
| 6961 | if (!depth) { |
| 6962 | ret = rbd_register_watch(rbd_dev); |
| 6963 | if (ret) { |
| 6964 | if (ret == -ENOENT) |
| 6965 | pr_info("image %s/%s%s%s does not exist\n", |
| 6966 | rbd_dev->spec->pool_name, |
| 6967 | rbd_dev->spec->pool_ns ?: "", |
| 6968 | rbd_dev->spec->pool_ns ? "/" : "", |
| 6969 | rbd_dev->spec->image_name); |
| 6970 | goto err_out_format; |
| 6971 | } |
| 6972 | } |
| 6973 | |
| 6974 | ret = rbd_dev_header_info(rbd_dev); |
| 6975 | if (ret) |
| 6976 | goto err_out_watch; |
| 6977 | |
| 6978 | /* |
| 6979 | * If this image is the one being mapped, we have pool name and |
| 6980 | * id, image name and id, and snap name - need to fill snap id. |
| 6981 | * Otherwise this is a parent image, identified by pool, image |
| 6982 | * and snap ids - need to fill in names for those ids. |
| 6983 | */ |
| 6984 | if (!depth) |
| 6985 | ret = rbd_spec_fill_snap_id(rbd_dev); |
| 6986 | else |
| 6987 | ret = rbd_spec_fill_names(rbd_dev); |
| 6988 | if (ret) { |
| 6989 | if (ret == -ENOENT) |
| 6990 | pr_info("snap %s/%s%s%s@%s does not exist\n", |
| 6991 | rbd_dev->spec->pool_name, |
| 6992 | rbd_dev->spec->pool_ns ?: "", |
| 6993 | rbd_dev->spec->pool_ns ? "/" : "", |
| 6994 | rbd_dev->spec->image_name, |
| 6995 | rbd_dev->spec->snap_name); |
| 6996 | goto err_out_probe; |
| 6997 | } |
| 6998 | |
| 6999 | ret = rbd_dev_mapping_set(rbd_dev); |
| 7000 | if (ret) |
| 7001 | goto err_out_probe; |
| 7002 | |
| 7003 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && |
| 7004 | (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) { |
| 7005 | ret = rbd_object_map_load(rbd_dev); |
| 7006 | if (ret) |
| 7007 | goto err_out_probe; |
| 7008 | } |
| 7009 | |
| 7010 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
| 7011 | ret = rbd_dev_v2_parent_info(rbd_dev); |
| 7012 | if (ret) |
| 7013 | goto err_out_probe; |
| 7014 | } |
| 7015 | |
| 7016 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
| 7017 | if (ret) |
| 7018 | goto err_out_probe; |
| 7019 | |
| 7020 | dout("discovered format %u image, header name is %s\n", |
| 7021 | rbd_dev->image_format, rbd_dev->header_oid.name); |
| 7022 | return 0; |
| 7023 | |
| 7024 | err_out_probe: |
| 7025 | rbd_dev_unprobe(rbd_dev); |
| 7026 | err_out_watch: |
| 7027 | if (!depth) |
| 7028 | rbd_unregister_watch(rbd_dev); |
| 7029 | err_out_format: |
| 7030 | rbd_dev->image_format = 0; |
| 7031 | kfree(rbd_dev->spec->image_id); |
| 7032 | rbd_dev->spec->image_id = NULL; |
| 7033 | return ret; |
| 7034 | } |
| 7035 | |
| 7036 | static ssize_t do_rbd_add(struct bus_type *bus, |
| 7037 | const char *buf, |
| 7038 | size_t count) |
| 7039 | { |
| 7040 | struct rbd_device *rbd_dev = NULL; |
| 7041 | struct ceph_options *ceph_opts = NULL; |
| 7042 | struct rbd_options *rbd_opts = NULL; |
| 7043 | struct rbd_spec *spec = NULL; |
| 7044 | struct rbd_client *rbdc; |
| 7045 | int rc; |
| 7046 | |
| 7047 | if (!try_module_get(THIS_MODULE)) |
| 7048 | return -ENODEV; |
| 7049 | |
| 7050 | /* parse add command */ |
| 7051 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
| 7052 | if (rc < 0) |
| 7053 | goto out; |
| 7054 | |
| 7055 | rbdc = rbd_get_client(ceph_opts); |
| 7056 | if (IS_ERR(rbdc)) { |
| 7057 | rc = PTR_ERR(rbdc); |
| 7058 | goto err_out_args; |
| 7059 | } |
| 7060 | |
| 7061 | /* pick the pool */ |
| 7062 | rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
| 7063 | if (rc < 0) { |
| 7064 | if (rc == -ENOENT) |
| 7065 | pr_info("pool %s does not exist\n", spec->pool_name); |
| 7066 | goto err_out_client; |
| 7067 | } |
| 7068 | spec->pool_id = (u64)rc; |
| 7069 | |
| 7070 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
| 7071 | if (!rbd_dev) { |
| 7072 | rc = -ENOMEM; |
| 7073 | goto err_out_client; |
| 7074 | } |
| 7075 | rbdc = NULL; /* rbd_dev now owns this */ |
| 7076 | spec = NULL; /* rbd_dev now owns this */ |
| 7077 | rbd_opts = NULL; /* rbd_dev now owns this */ |
| 7078 | |
| 7079 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
| 7080 | if (!rbd_dev->config_info) { |
| 7081 | rc = -ENOMEM; |
| 7082 | goto err_out_rbd_dev; |
| 7083 | } |
| 7084 | |
| 7085 | down_write(&rbd_dev->header_rwsem); |
| 7086 | rc = rbd_dev_image_probe(rbd_dev, 0); |
| 7087 | if (rc < 0) { |
| 7088 | up_write(&rbd_dev->header_rwsem); |
| 7089 | goto err_out_rbd_dev; |
| 7090 | } |
| 7091 | |
| 7092 | /* If we are mapping a snapshot it must be marked read-only */ |
| 7093 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| 7094 | rbd_dev->opts->read_only = true; |
| 7095 | |
| 7096 | if (rbd_dev->opts->alloc_size > rbd_dev->layout.object_size) { |
| 7097 | rbd_warn(rbd_dev, "alloc_size adjusted to %u", |
| 7098 | rbd_dev->layout.object_size); |
| 7099 | rbd_dev->opts->alloc_size = rbd_dev->layout.object_size; |
| 7100 | } |
| 7101 | |
| 7102 | rc = rbd_dev_device_setup(rbd_dev); |
| 7103 | if (rc) |
| 7104 | goto err_out_image_probe; |
| 7105 | |
| 7106 | rc = rbd_add_acquire_lock(rbd_dev); |
| 7107 | if (rc) |
| 7108 | goto err_out_image_lock; |
| 7109 | |
| 7110 | /* Everything's ready. Announce the disk to the world. */ |
| 7111 | |
| 7112 | rc = device_add(&rbd_dev->dev); |
| 7113 | if (rc) |
| 7114 | goto err_out_image_lock; |
| 7115 | |
| 7116 | add_disk(rbd_dev->disk); |
| 7117 | /* see rbd_init_disk() */ |
| 7118 | blk_put_queue(rbd_dev->disk->queue); |
| 7119 | |
| 7120 | spin_lock(&rbd_dev_list_lock); |
| 7121 | list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| 7122 | spin_unlock(&rbd_dev_list_lock); |
| 7123 | |
| 7124 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, |
| 7125 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, |
| 7126 | rbd_dev->header.features); |
| 7127 | rc = count; |
| 7128 | out: |
| 7129 | module_put(THIS_MODULE); |
| 7130 | return rc; |
| 7131 | |
| 7132 | err_out_image_lock: |
| 7133 | rbd_dev_image_unlock(rbd_dev); |
| 7134 | rbd_dev_device_release(rbd_dev); |
| 7135 | err_out_image_probe: |
| 7136 | rbd_dev_image_release(rbd_dev); |
| 7137 | err_out_rbd_dev: |
| 7138 | rbd_dev_destroy(rbd_dev); |
| 7139 | err_out_client: |
| 7140 | rbd_put_client(rbdc); |
| 7141 | err_out_args: |
| 7142 | rbd_spec_put(spec); |
| 7143 | kfree(rbd_opts); |
| 7144 | goto out; |
| 7145 | } |
| 7146 | |
| 7147 | static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count) |
| 7148 | { |
| 7149 | if (single_major) |
| 7150 | return -EINVAL; |
| 7151 | |
| 7152 | return do_rbd_add(bus, buf, count); |
| 7153 | } |
| 7154 | |
| 7155 | static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, |
| 7156 | size_t count) |
| 7157 | { |
| 7158 | return do_rbd_add(bus, buf, count); |
| 7159 | } |
| 7160 | |
| 7161 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
| 7162 | { |
| 7163 | while (rbd_dev->parent) { |
| 7164 | struct rbd_device *first = rbd_dev; |
| 7165 | struct rbd_device *second = first->parent; |
| 7166 | struct rbd_device *third; |
| 7167 | |
| 7168 | /* |
| 7169 | * Follow to the parent with no grandparent and |
| 7170 | * remove it. |
| 7171 | */ |
| 7172 | while (second && (third = second->parent)) { |
| 7173 | first = second; |
| 7174 | second = third; |
| 7175 | } |
| 7176 | rbd_assert(second); |
| 7177 | rbd_dev_image_release(second); |
| 7178 | rbd_dev_destroy(second); |
| 7179 | first->parent = NULL; |
| 7180 | first->parent_overlap = 0; |
| 7181 | |
| 7182 | rbd_assert(first->parent_spec); |
| 7183 | rbd_spec_put(first->parent_spec); |
| 7184 | first->parent_spec = NULL; |
| 7185 | } |
| 7186 | } |
| 7187 | |
| 7188 | static ssize_t do_rbd_remove(struct bus_type *bus, |
| 7189 | const char *buf, |
| 7190 | size_t count) |
| 7191 | { |
| 7192 | struct rbd_device *rbd_dev = NULL; |
| 7193 | struct list_head *tmp; |
| 7194 | int dev_id; |
| 7195 | char opt_buf[6]; |
| 7196 | bool force = false; |
| 7197 | int ret; |
| 7198 | |
| 7199 | dev_id = -1; |
| 7200 | opt_buf[0] = '\0'; |
| 7201 | sscanf(buf, "%d %5s", &dev_id, opt_buf); |
| 7202 | if (dev_id < 0) { |
| 7203 | pr_err("dev_id out of range\n"); |
| 7204 | return -EINVAL; |
| 7205 | } |
| 7206 | if (opt_buf[0] != '\0') { |
| 7207 | if (!strcmp(opt_buf, "force")) { |
| 7208 | force = true; |
| 7209 | } else { |
| 7210 | pr_err("bad remove option at '%s'\n", opt_buf); |
| 7211 | return -EINVAL; |
| 7212 | } |
| 7213 | } |
| 7214 | |
| 7215 | ret = -ENOENT; |
| 7216 | spin_lock(&rbd_dev_list_lock); |
| 7217 | list_for_each(tmp, &rbd_dev_list) { |
| 7218 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
| 7219 | if (rbd_dev->dev_id == dev_id) { |
| 7220 | ret = 0; |
| 7221 | break; |
| 7222 | } |
| 7223 | } |
| 7224 | if (!ret) { |
| 7225 | spin_lock_irq(&rbd_dev->lock); |
| 7226 | if (rbd_dev->open_count && !force) |
| 7227 | ret = -EBUSY; |
| 7228 | else if (test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
| 7229 | &rbd_dev->flags)) |
| 7230 | ret = -EINPROGRESS; |
| 7231 | spin_unlock_irq(&rbd_dev->lock); |
| 7232 | } |
| 7233 | spin_unlock(&rbd_dev_list_lock); |
| 7234 | if (ret) |
| 7235 | return ret; |
| 7236 | |
| 7237 | if (force) { |
| 7238 | /* |
| 7239 | * Prevent new IO from being queued and wait for existing |
| 7240 | * IO to complete/fail. |
| 7241 | */ |
| 7242 | blk_mq_freeze_queue(rbd_dev->disk->queue); |
| 7243 | blk_set_queue_dying(rbd_dev->disk->queue); |
| 7244 | } |
| 7245 | |
| 7246 | del_gendisk(rbd_dev->disk); |
| 7247 | spin_lock(&rbd_dev_list_lock); |
| 7248 | list_del_init(&rbd_dev->node); |
| 7249 | spin_unlock(&rbd_dev_list_lock); |
| 7250 | device_del(&rbd_dev->dev); |
| 7251 | |
| 7252 | rbd_dev_image_unlock(rbd_dev); |
| 7253 | rbd_dev_device_release(rbd_dev); |
| 7254 | rbd_dev_image_release(rbd_dev); |
| 7255 | rbd_dev_destroy(rbd_dev); |
| 7256 | return count; |
| 7257 | } |
| 7258 | |
| 7259 | static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count) |
| 7260 | { |
| 7261 | if (single_major) |
| 7262 | return -EINVAL; |
| 7263 | |
| 7264 | return do_rbd_remove(bus, buf, count); |
| 7265 | } |
| 7266 | |
| 7267 | static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, |
| 7268 | size_t count) |
| 7269 | { |
| 7270 | return do_rbd_remove(bus, buf, count); |
| 7271 | } |
| 7272 | |
| 7273 | /* |
| 7274 | * create control files in sysfs |
| 7275 | * /sys/bus/rbd/... |
| 7276 | */ |
| 7277 | static int __init rbd_sysfs_init(void) |
| 7278 | { |
| 7279 | int ret; |
| 7280 | |
| 7281 | ret = device_register(&rbd_root_dev); |
| 7282 | if (ret < 0) |
| 7283 | return ret; |
| 7284 | |
| 7285 | ret = bus_register(&rbd_bus_type); |
| 7286 | if (ret < 0) |
| 7287 | device_unregister(&rbd_root_dev); |
| 7288 | |
| 7289 | return ret; |
| 7290 | } |
| 7291 | |
| 7292 | static void __exit rbd_sysfs_cleanup(void) |
| 7293 | { |
| 7294 | bus_unregister(&rbd_bus_type); |
| 7295 | device_unregister(&rbd_root_dev); |
| 7296 | } |
| 7297 | |
| 7298 | static int __init rbd_slab_init(void) |
| 7299 | { |
| 7300 | rbd_assert(!rbd_img_request_cache); |
| 7301 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
| 7302 | if (!rbd_img_request_cache) |
| 7303 | return -ENOMEM; |
| 7304 | |
| 7305 | rbd_assert(!rbd_obj_request_cache); |
| 7306 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
| 7307 | if (!rbd_obj_request_cache) |
| 7308 | goto out_err; |
| 7309 | |
| 7310 | return 0; |
| 7311 | |
| 7312 | out_err: |
| 7313 | kmem_cache_destroy(rbd_img_request_cache); |
| 7314 | rbd_img_request_cache = NULL; |
| 7315 | return -ENOMEM; |
| 7316 | } |
| 7317 | |
| 7318 | static void rbd_slab_exit(void) |
| 7319 | { |
| 7320 | rbd_assert(rbd_obj_request_cache); |
| 7321 | kmem_cache_destroy(rbd_obj_request_cache); |
| 7322 | rbd_obj_request_cache = NULL; |
| 7323 | |
| 7324 | rbd_assert(rbd_img_request_cache); |
| 7325 | kmem_cache_destroy(rbd_img_request_cache); |
| 7326 | rbd_img_request_cache = NULL; |
| 7327 | } |
| 7328 | |
| 7329 | static int __init rbd_init(void) |
| 7330 | { |
| 7331 | int rc; |
| 7332 | |
| 7333 | if (!libceph_compatible(NULL)) { |
| 7334 | rbd_warn(NULL, "libceph incompatibility (quitting)"); |
| 7335 | return -EINVAL; |
| 7336 | } |
| 7337 | |
| 7338 | rc = rbd_slab_init(); |
| 7339 | if (rc) |
| 7340 | return rc; |
| 7341 | |
| 7342 | /* |
| 7343 | * The number of active work items is limited by the number of |
| 7344 | * rbd devices * queue depth, so leave @max_active at default. |
| 7345 | */ |
| 7346 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); |
| 7347 | if (!rbd_wq) { |
| 7348 | rc = -ENOMEM; |
| 7349 | goto err_out_slab; |
| 7350 | } |
| 7351 | |
| 7352 | if (single_major) { |
| 7353 | rbd_major = register_blkdev(0, RBD_DRV_NAME); |
| 7354 | if (rbd_major < 0) { |
| 7355 | rc = rbd_major; |
| 7356 | goto err_out_wq; |
| 7357 | } |
| 7358 | } |
| 7359 | |
| 7360 | rc = rbd_sysfs_init(); |
| 7361 | if (rc) |
| 7362 | goto err_out_blkdev; |
| 7363 | |
| 7364 | if (single_major) |
| 7365 | pr_info("loaded (major %d)\n", rbd_major); |
| 7366 | else |
| 7367 | pr_info("loaded\n"); |
| 7368 | |
| 7369 | return 0; |
| 7370 | |
| 7371 | err_out_blkdev: |
| 7372 | if (single_major) |
| 7373 | unregister_blkdev(rbd_major, RBD_DRV_NAME); |
| 7374 | err_out_wq: |
| 7375 | destroy_workqueue(rbd_wq); |
| 7376 | err_out_slab: |
| 7377 | rbd_slab_exit(); |
| 7378 | return rc; |
| 7379 | } |
| 7380 | |
| 7381 | static void __exit rbd_exit(void) |
| 7382 | { |
| 7383 | ida_destroy(&rbd_dev_id_ida); |
| 7384 | rbd_sysfs_cleanup(); |
| 7385 | if (single_major) |
| 7386 | unregister_blkdev(rbd_major, RBD_DRV_NAME); |
| 7387 | destroy_workqueue(rbd_wq); |
| 7388 | rbd_slab_exit(); |
| 7389 | } |
| 7390 | |
| 7391 | module_init(rbd_init); |
| 7392 | module_exit(rbd_exit); |
| 7393 | |
| 7394 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
| 7395 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| 7396 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
| 7397 | /* following authorship retained from original osdblk.c */ |
| 7398 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| 7399 | |
| 7400 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
| 7401 | MODULE_LICENSE("GPL"); |