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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
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 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
ed95b21a | 34 | #include <linux/ceph/cls_lock_client.h> |
43df3d35 | 35 | #include <linux/ceph/striper.h> |
602adf40 | 36 | #include <linux/ceph/decode.h> |
82995cc6 | 37 | #include <linux/fs_parser.h> |
30d1cff8 | 38 | #include <linux/bsearch.h> |
602adf40 YS |
39 | |
40 | #include <linux/kernel.h> | |
41 | #include <linux/device.h> | |
42 | #include <linux/module.h> | |
7ad18afa | 43 | #include <linux/blk-mq.h> |
602adf40 YS |
44 | #include <linux/fs.h> |
45 | #include <linux/blkdev.h> | |
1c2a9dfe | 46 | #include <linux/slab.h> |
f8a22fc2 | 47 | #include <linux/idr.h> |
bc1ecc65 | 48 | #include <linux/workqueue.h> |
602adf40 YS |
49 | |
50 | #include "rbd_types.h" | |
51 | ||
aafb230e AE |
52 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
53 | ||
a2acd00e AE |
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 | ||
bfc18e38 | 64 | counter = (unsigned int)atomic_fetch_add_unless(v, 1, 0); |
a2acd00e AE |
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 | ||
f0f8cef5 | 87 | #define RBD_DRV_NAME "rbd" |
602adf40 | 88 | |
7e513d43 ID |
89 | #define RBD_MINORS_PER_MAJOR 256 |
90 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 91 | |
6d69bb53 ID |
92 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
93 | ||
d4b125e9 AE |
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 | ||
35d489f9 | 98 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
99 | |
100 | #define RBD_SNAP_HEAD_NAME "-" | |
101 | ||
9682fc6d AE |
102 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
103 | ||
9e15b77d AE |
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) | |
1e130199 | 106 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 107 | |
1e130199 | 108 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 109 | |
ed95b21a | 110 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
99d16943 ID |
111 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
112 | ||
d889140c AE |
113 | /* Feature bits */ |
114 | ||
8767b293 ID |
115 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
116 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) | |
117 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) | |
22e8bd51 ID |
118 | #define RBD_FEATURE_OBJECT_MAP (1ULL<<3) |
119 | #define RBD_FEATURE_FAST_DIFF (1ULL<<4) | |
b9f6d447 | 120 | #define RBD_FEATURE_DEEP_FLATTEN (1ULL<<5) |
8767b293 | 121 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) |
e573427a | 122 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
8767b293 | 123 | |
ed95b21a ID |
124 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
125 | RBD_FEATURE_STRIPINGV2 | \ | |
7e97332e | 126 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
22e8bd51 ID |
127 | RBD_FEATURE_OBJECT_MAP | \ |
128 | RBD_FEATURE_FAST_DIFF | \ | |
b9f6d447 | 129 | RBD_FEATURE_DEEP_FLATTEN | \ |
e573427a ID |
130 | RBD_FEATURE_DATA_POOL | \ |
131 | RBD_FEATURE_OPERATIONS) | |
d889140c AE |
132 | |
133 | /* Features supported by this (client software) implementation. */ | |
134 | ||
770eba6e | 135 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 136 | |
81a89793 AE |
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. | |
81a89793 | 140 | */ |
602adf40 YS |
141 | #define DEV_NAME_LEN 32 |
142 | ||
143 | /* | |
144 | * block device image metadata (in-memory version) | |
145 | */ | |
146 | struct rbd_image_header { | |
f35a4dee | 147 | /* These six fields never change for a given rbd image */ |
849b4260 | 148 | char *object_prefix; |
602adf40 | 149 | __u8 obj_order; |
f35a4dee AE |
150 | u64 stripe_unit; |
151 | u64 stripe_count; | |
7e97332e | 152 | s64 data_pool_id; |
f35a4dee | 153 | u64 features; /* Might be changeable someday? */ |
602adf40 | 154 | |
f84344f3 AE |
155 | /* The remaining fields need to be updated occasionally */ |
156 | u64 image_size; | |
157 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
158 | char *snap_names; /* format 1 only */ |
159 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
160 | }; |
161 | ||
0d7dbfce AE |
162 | /* |
163 | * An rbd image specification. | |
164 | * | |
165 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
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). | |
0d7dbfce AE |
186 | */ |
187 | struct rbd_spec { | |
188 | u64 pool_id; | |
ecb4dc22 | 189 | const char *pool_name; |
b26c047b | 190 | const char *pool_ns; /* NULL if default, never "" */ |
0d7dbfce | 191 | |
ecb4dc22 AE |
192 | const char *image_id; |
193 | const char *image_name; | |
0d7dbfce AE |
194 | |
195 | u64 snap_id; | |
ecb4dc22 | 196 | const char *snap_name; |
0d7dbfce AE |
197 | |
198 | struct kref kref; | |
199 | }; | |
200 | ||
602adf40 | 201 | /* |
f0f8cef5 | 202 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
203 | */ |
204 | struct rbd_client { | |
205 | struct ceph_client *client; | |
206 | struct kref kref; | |
207 | struct list_head node; | |
208 | }; | |
209 | ||
0192ce2e ID |
210 | struct pending_result { |
211 | int result; /* first nonzero result */ | |
212 | int num_pending; | |
213 | }; | |
214 | ||
bf0d5f50 | 215 | struct rbd_img_request; |
bf0d5f50 | 216 | |
9969ebc5 | 217 | enum obj_request_type { |
a1fbb5e7 | 218 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 219 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 220 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
afb97888 | 221 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
9969ebc5 | 222 | }; |
bf0d5f50 | 223 | |
6d2940c8 | 224 | enum obj_operation_type { |
a1fbb5e7 | 225 | OBJ_OP_READ = 1, |
6d2940c8 | 226 | OBJ_OP_WRITE, |
90e98c52 | 227 | OBJ_OP_DISCARD, |
6484cbe9 | 228 | OBJ_OP_ZEROOUT, |
6d2940c8 GZ |
229 | }; |
230 | ||
0ad5d953 ID |
231 | #define RBD_OBJ_FLAG_DELETION (1U << 0) |
232 | #define RBD_OBJ_FLAG_COPYUP_ENABLED (1U << 1) | |
793333a3 | 233 | #define RBD_OBJ_FLAG_COPYUP_ZEROS (1U << 2) |
22e8bd51 ID |
234 | #define RBD_OBJ_FLAG_MAY_EXIST (1U << 3) |
235 | #define RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT (1U << 4) | |
0ad5d953 | 236 | |
a9b67e69 | 237 | enum rbd_obj_read_state { |
85b5e6d1 ID |
238 | RBD_OBJ_READ_START = 1, |
239 | RBD_OBJ_READ_OBJECT, | |
a9b67e69 ID |
240 | RBD_OBJ_READ_PARENT, |
241 | }; | |
242 | ||
3da691bf ID |
243 | /* |
244 | * Writes go through the following state machine to deal with | |
245 | * layering: | |
246 | * | |
89a59c1c ID |
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 | |
3da691bf ID |
263 | * |
264 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
89a59c1c ID |
265 | * assert_exists guard is needed or not (in some cases it's not needed |
266 | * even if there is a parent). | |
3da691bf ID |
267 | */ |
268 | enum rbd_obj_write_state { | |
85b5e6d1 | 269 | RBD_OBJ_WRITE_START = 1, |
22e8bd51 | 270 | RBD_OBJ_WRITE_PRE_OBJECT_MAP, |
85b5e6d1 | 271 | RBD_OBJ_WRITE_OBJECT, |
793333a3 ID |
272 | __RBD_OBJ_WRITE_COPYUP, |
273 | RBD_OBJ_WRITE_COPYUP, | |
22e8bd51 | 274 | RBD_OBJ_WRITE_POST_OBJECT_MAP, |
793333a3 ID |
275 | }; |
276 | ||
277 | enum rbd_obj_copyup_state { | |
278 | RBD_OBJ_COPYUP_START = 1, | |
279 | RBD_OBJ_COPYUP_READ_PARENT, | |
22e8bd51 ID |
280 | __RBD_OBJ_COPYUP_OBJECT_MAPS, |
281 | RBD_OBJ_COPYUP_OBJECT_MAPS, | |
793333a3 ID |
282 | __RBD_OBJ_COPYUP_WRITE_OBJECT, |
283 | RBD_OBJ_COPYUP_WRITE_OBJECT, | |
926f9b3f AE |
284 | }; |
285 | ||
bf0d5f50 | 286 | struct rbd_obj_request { |
43df3d35 | 287 | struct ceph_object_extent ex; |
0ad5d953 | 288 | unsigned int flags; /* RBD_OBJ_FLAG_* */ |
c5b5ef6c | 289 | union { |
a9b67e69 | 290 | enum rbd_obj_read_state read_state; /* for reads */ |
3da691bf | 291 | enum rbd_obj_write_state write_state; /* for writes */ |
c5b5ef6c | 292 | }; |
bf0d5f50 | 293 | |
51c3509e | 294 | struct rbd_img_request *img_request; |
86bd7998 ID |
295 | struct ceph_file_extent *img_extents; |
296 | u32 num_img_extents; | |
bf0d5f50 | 297 | |
788e2df3 | 298 | union { |
5359a17d | 299 | struct ceph_bio_iter bio_pos; |
788e2df3 | 300 | struct { |
7e07efb1 ID |
301 | struct ceph_bvec_iter bvec_pos; |
302 | u32 bvec_count; | |
afb97888 | 303 | u32 bvec_idx; |
788e2df3 AE |
304 | }; |
305 | }; | |
793333a3 ID |
306 | |
307 | enum rbd_obj_copyup_state copyup_state; | |
7e07efb1 ID |
308 | struct bio_vec *copyup_bvecs; |
309 | u32 copyup_bvec_count; | |
bf0d5f50 | 310 | |
bcbab1db | 311 | struct list_head osd_reqs; /* w/ r_private_item */ |
bf0d5f50 | 312 | |
85b5e6d1 | 313 | struct mutex state_mutex; |
793333a3 | 314 | struct pending_result pending; |
bf0d5f50 AE |
315 | struct kref kref; |
316 | }; | |
317 | ||
0c425248 | 318 | enum img_req_flags { |
9849e986 | 319 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 320 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
321 | }; |
322 | ||
0192ce2e ID |
323 | enum rbd_img_state { |
324 | RBD_IMG_START = 1, | |
637cd060 | 325 | RBD_IMG_EXCLUSIVE_LOCK, |
0192ce2e ID |
326 | __RBD_IMG_OBJECT_REQUESTS, |
327 | RBD_IMG_OBJECT_REQUESTS, | |
328 | }; | |
329 | ||
bf0d5f50 | 330 | struct rbd_img_request { |
bf0d5f50 | 331 | struct rbd_device *rbd_dev; |
9bb0248d | 332 | enum obj_operation_type op_type; |
ecc633ca | 333 | enum obj_request_type data_type; |
0c425248 | 334 | unsigned long flags; |
0192ce2e | 335 | enum rbd_img_state state; |
bf0d5f50 | 336 | union { |
9849e986 | 337 | u64 snap_id; /* for reads */ |
bf0d5f50 | 338 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 | 339 | }; |
59e542c8 | 340 | struct rbd_obj_request *obj_request; /* obj req initiator */ |
bf0d5f50 | 341 | |
e1fddc8f | 342 | struct list_head lock_item; |
43df3d35 | 343 | struct list_head object_extents; /* obj_req.ex structs */ |
bf0d5f50 | 344 | |
0192ce2e ID |
345 | struct mutex state_mutex; |
346 | struct pending_result pending; | |
347 | struct work_struct work; | |
348 | int work_result; | |
bf0d5f50 AE |
349 | }; |
350 | ||
351 | #define for_each_obj_request(ireq, oreq) \ | |
43df3d35 | 352 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 353 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
43df3d35 | 354 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 355 | |
99d16943 ID |
356 | enum rbd_watch_state { |
357 | RBD_WATCH_STATE_UNREGISTERED, | |
358 | RBD_WATCH_STATE_REGISTERED, | |
359 | RBD_WATCH_STATE_ERROR, | |
360 | }; | |
361 | ||
ed95b21a ID |
362 | enum rbd_lock_state { |
363 | RBD_LOCK_STATE_UNLOCKED, | |
364 | RBD_LOCK_STATE_LOCKED, | |
365 | RBD_LOCK_STATE_RELEASING, | |
366 | }; | |
367 | ||
368 | /* WatchNotify::ClientId */ | |
369 | struct rbd_client_id { | |
370 | u64 gid; | |
371 | u64 handle; | |
372 | }; | |
373 | ||
f84344f3 | 374 | struct rbd_mapping { |
99c1f08f | 375 | u64 size; |
f84344f3 AE |
376 | }; |
377 | ||
602adf40 YS |
378 | /* |
379 | * a single device | |
380 | */ | |
381 | struct rbd_device { | |
de71a297 | 382 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
383 | |
384 | int major; /* blkdev assigned major */ | |
dd82fff1 | 385 | int minor; |
602adf40 | 386 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 387 | |
a30b71b9 | 388 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
389 | struct rbd_client *rbd_client; |
390 | ||
391 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
392 | ||
b82d167b | 393 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
394 | |
395 | struct rbd_image_header header; | |
b82d167b | 396 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 397 | struct rbd_spec *spec; |
d147543d | 398 | struct rbd_options *opts; |
0d6d1e9c | 399 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 400 | |
c41d13a3 | 401 | struct ceph_object_id header_oid; |
922dab61 | 402 | struct ceph_object_locator header_oloc; |
971f839a | 403 | |
1643dfa4 | 404 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 405 | |
99d16943 ID |
406 | struct mutex watch_mutex; |
407 | enum rbd_watch_state watch_state; | |
922dab61 | 408 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
409 | u64 watch_cookie; |
410 | struct delayed_work watch_dwork; | |
59c2be1e | 411 | |
ed95b21a ID |
412 | struct rw_semaphore lock_rwsem; |
413 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 414 | char lock_cookie[32]; |
ed95b21a ID |
415 | struct rbd_client_id owner_cid; |
416 | struct work_struct acquired_lock_work; | |
417 | struct work_struct released_lock_work; | |
418 | struct delayed_work lock_dwork; | |
419 | struct work_struct unlock_work; | |
e1fddc8f | 420 | spinlock_t lock_lists_lock; |
637cd060 | 421 | struct list_head acquiring_list; |
e1fddc8f | 422 | struct list_head running_list; |
637cd060 ID |
423 | struct completion acquire_wait; |
424 | int acquire_err; | |
e1fddc8f | 425 | struct completion releasing_wait; |
ed95b21a | 426 | |
22e8bd51 ID |
427 | spinlock_t object_map_lock; |
428 | u8 *object_map; | |
429 | u64 object_map_size; /* in objects */ | |
430 | u64 object_map_flags; | |
ed95b21a | 431 | |
1643dfa4 | 432 | struct workqueue_struct *task_wq; |
59c2be1e | 433 | |
86b00e0d AE |
434 | struct rbd_spec *parent_spec; |
435 | u64 parent_overlap; | |
a2acd00e | 436 | atomic_t parent_ref; |
2f82ee54 | 437 | struct rbd_device *parent; |
86b00e0d | 438 | |
7ad18afa CH |
439 | /* Block layer tags. */ |
440 | struct blk_mq_tag_set tag_set; | |
441 | ||
c666601a JD |
442 | /* protects updating the header */ |
443 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
444 | |
445 | struct rbd_mapping mapping; | |
602adf40 YS |
446 | |
447 | struct list_head node; | |
dfc5606d | 448 | |
dfc5606d YS |
449 | /* sysfs related */ |
450 | struct device dev; | |
b82d167b | 451 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
452 | }; |
453 | ||
b82d167b | 454 | /* |
87c0fded ID |
455 | * Flag bits for rbd_dev->flags: |
456 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
457 | * by rbd_dev->lock | |
b82d167b | 458 | */ |
6d292906 | 459 | enum rbd_dev_flags { |
686238b7 | 460 | RBD_DEV_FLAG_EXISTS, /* rbd_dev_device_setup() ran */ |
b82d167b | 461 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
39258aa2 | 462 | RBD_DEV_FLAG_READONLY, /* -o ro or snapshot */ |
6d292906 AE |
463 | }; |
464 | ||
cfbf6377 | 465 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 466 | |
602adf40 | 467 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
468 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
469 | ||
432b8587 AE |
470 | static LIST_HEAD(rbd_client_list); /* clients */ |
471 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 472 | |
78c2a44a AE |
473 | /* Slab caches for frequently-allocated structures */ |
474 | ||
1c2a9dfe | 475 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 476 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 477 | |
9b60e70b | 478 | static int rbd_major; |
f8a22fc2 ID |
479 | static DEFINE_IDA(rbd_dev_id_ida); |
480 | ||
f5ee37bd ID |
481 | static struct workqueue_struct *rbd_wq; |
482 | ||
89a59c1c ID |
483 | static struct ceph_snap_context rbd_empty_snapc = { |
484 | .nref = REFCOUNT_INIT(1), | |
485 | }; | |
486 | ||
9b60e70b | 487 | /* |
3cfa3b16 | 488 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 489 | */ |
3cfa3b16 | 490 | static bool single_major = true; |
5657a819 | 491 | module_param(single_major, bool, 0444); |
3cfa3b16 | 492 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 493 | |
7e9586ba GKH |
494 | static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count); |
495 | static ssize_t remove_store(struct bus_type *bus, const char *buf, | |
496 | size_t count); | |
497 | static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, | |
498 | size_t count); | |
499 | static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, | |
500 | size_t count); | |
6d69bb53 | 501 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
f0f8cef5 | 502 | |
9b60e70b ID |
503 | static int rbd_dev_id_to_minor(int dev_id) |
504 | { | |
7e513d43 | 505 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
506 | } |
507 | ||
508 | static int minor_to_rbd_dev_id(int minor) | |
509 | { | |
7e513d43 | 510 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
511 | } |
512 | ||
39258aa2 ID |
513 | static bool rbd_is_ro(struct rbd_device *rbd_dev) |
514 | { | |
515 | return test_bit(RBD_DEV_FLAG_READONLY, &rbd_dev->flags); | |
516 | } | |
517 | ||
f3c0e459 ID |
518 | static bool rbd_is_snap(struct rbd_device *rbd_dev) |
519 | { | |
520 | return rbd_dev->spec->snap_id != CEPH_NOSNAP; | |
521 | } | |
522 | ||
ed95b21a ID |
523 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
524 | { | |
637cd060 ID |
525 | lockdep_assert_held(&rbd_dev->lock_rwsem); |
526 | ||
ed95b21a ID |
527 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || |
528 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
529 | } | |
530 | ||
531 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
532 | { | |
533 | bool is_lock_owner; | |
534 | ||
535 | down_read(&rbd_dev->lock_rwsem); | |
536 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
537 | up_read(&rbd_dev->lock_rwsem); | |
538 | return is_lock_owner; | |
539 | } | |
540 | ||
7e9586ba | 541 | static ssize_t supported_features_show(struct bus_type *bus, char *buf) |
8767b293 ID |
542 | { |
543 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
544 | } | |
545 | ||
7e9586ba GKH |
546 | static BUS_ATTR_WO(add); |
547 | static BUS_ATTR_WO(remove); | |
548 | static BUS_ATTR_WO(add_single_major); | |
549 | static BUS_ATTR_WO(remove_single_major); | |
550 | static BUS_ATTR_RO(supported_features); | |
b15a21dd GKH |
551 | |
552 | static struct attribute *rbd_bus_attrs[] = { | |
553 | &bus_attr_add.attr, | |
554 | &bus_attr_remove.attr, | |
9b60e70b ID |
555 | &bus_attr_add_single_major.attr, |
556 | &bus_attr_remove_single_major.attr, | |
8767b293 | 557 | &bus_attr_supported_features.attr, |
b15a21dd | 558 | NULL, |
f0f8cef5 | 559 | }; |
92c76dc0 ID |
560 | |
561 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
562 | struct attribute *attr, int index) | |
563 | { | |
9b60e70b ID |
564 | if (!single_major && |
565 | (attr == &bus_attr_add_single_major.attr || | |
566 | attr == &bus_attr_remove_single_major.attr)) | |
567 | return 0; | |
568 | ||
92c76dc0 ID |
569 | return attr->mode; |
570 | } | |
571 | ||
572 | static const struct attribute_group rbd_bus_group = { | |
573 | .attrs = rbd_bus_attrs, | |
574 | .is_visible = rbd_bus_is_visible, | |
575 | }; | |
576 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
577 | |
578 | static struct bus_type rbd_bus_type = { | |
579 | .name = "rbd", | |
b15a21dd | 580 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
581 | }; |
582 | ||
583 | static void rbd_root_dev_release(struct device *dev) | |
584 | { | |
585 | } | |
586 | ||
587 | static struct device rbd_root_dev = { | |
588 | .init_name = "rbd", | |
589 | .release = rbd_root_dev_release, | |
590 | }; | |
591 | ||
06ecc6cb AE |
592 | static __printf(2, 3) |
593 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
594 | { | |
595 | struct va_format vaf; | |
596 | va_list args; | |
597 | ||
598 | va_start(args, fmt); | |
599 | vaf.fmt = fmt; | |
600 | vaf.va = &args; | |
601 | ||
602 | if (!rbd_dev) | |
603 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
604 | else if (rbd_dev->disk) | |
605 | printk(KERN_WARNING "%s: %s: %pV\n", | |
606 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
607 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
608 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
609 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
610 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
611 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
612 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
613 | else /* punt */ | |
614 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
615 | RBD_DRV_NAME, rbd_dev, &vaf); | |
616 | va_end(args); | |
617 | } | |
618 | ||
aafb230e AE |
619 | #ifdef RBD_DEBUG |
620 | #define rbd_assert(expr) \ | |
621 | if (unlikely(!(expr))) { \ | |
622 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
623 | "at line %d:\n\n" \ | |
624 | "\trbd_assert(%s);\n\n", \ | |
625 | __func__, __LINE__, #expr); \ | |
626 | BUG(); \ | |
627 | } | |
628 | #else /* !RBD_DEBUG */ | |
629 | # define rbd_assert(expr) ((void) 0) | |
630 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 631 | |
05a46afd | 632 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 633 | |
cc4a38bd | 634 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 635 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 636 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 637 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
638 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
639 | u64 snap_id); | |
2ad3d716 AE |
640 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
641 | u8 *order, u64 *snap_size); | |
22e8bd51 | 642 | static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev); |
59c2be1e | 643 | |
54ab3b24 | 644 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result); |
0192ce2e ID |
645 | static void rbd_img_handle_request(struct rbd_img_request *img_req, int result); |
646 | ||
647 | /* | |
648 | * Return true if nothing else is pending. | |
649 | */ | |
650 | static bool pending_result_dec(struct pending_result *pending, int *result) | |
651 | { | |
652 | rbd_assert(pending->num_pending > 0); | |
653 | ||
654 | if (*result && !pending->result) | |
655 | pending->result = *result; | |
656 | if (--pending->num_pending) | |
657 | return false; | |
658 | ||
659 | *result = pending->result; | |
660 | return true; | |
661 | } | |
59c2be1e | 662 | |
602adf40 YS |
663 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
664 | { | |
f0f8cef5 | 665 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 666 | bool removing = false; |
602adf40 | 667 | |
a14ea269 | 668 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
669 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
670 | removing = true; | |
671 | else | |
672 | rbd_dev->open_count++; | |
a14ea269 | 673 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
674 | if (removing) |
675 | return -ENOENT; | |
676 | ||
c3e946ce | 677 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 678 | |
602adf40 YS |
679 | return 0; |
680 | } | |
681 | ||
db2a144b | 682 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
683 | { |
684 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
685 | unsigned long open_count_before; |
686 | ||
a14ea269 | 687 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 688 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 689 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 690 | rbd_assert(open_count_before > 0); |
dfc5606d | 691 | |
c3e946ce | 692 | put_device(&rbd_dev->dev); |
dfc5606d YS |
693 | } |
694 | ||
131fd9f6 GZ |
695 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
696 | { | |
1de797bb | 697 | int ro; |
131fd9f6 | 698 | |
1de797bb | 699 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
700 | return -EFAULT; |
701 | ||
c1b62057 ID |
702 | /* |
703 | * Both images mapped read-only and snapshots can't be marked | |
704 | * read-write. | |
705 | */ | |
706 | if (!ro) { | |
707 | if (rbd_is_ro(rbd_dev)) | |
708 | return -EROFS; | |
709 | ||
710 | rbd_assert(!rbd_is_snap(rbd_dev)); | |
711 | } | |
131fd9f6 | 712 | |
1de797bb ID |
713 | /* Let blkdev_roset() handle it */ |
714 | return -ENOTTY; | |
131fd9f6 GZ |
715 | } |
716 | ||
717 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
718 | unsigned int cmd, unsigned long arg) | |
719 | { | |
720 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 721 | int ret; |
131fd9f6 | 722 | |
131fd9f6 GZ |
723 | switch (cmd) { |
724 | case BLKROSET: | |
725 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
726 | break; | |
727 | default: | |
728 | ret = -ENOTTY; | |
729 | } | |
730 | ||
131fd9f6 GZ |
731 | return ret; |
732 | } | |
733 | ||
734 | #ifdef CONFIG_COMPAT | |
735 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
736 | unsigned int cmd, unsigned long arg) | |
737 | { | |
738 | return rbd_ioctl(bdev, mode, cmd, arg); | |
739 | } | |
740 | #endif /* CONFIG_COMPAT */ | |
741 | ||
602adf40 YS |
742 | static const struct block_device_operations rbd_bd_ops = { |
743 | .owner = THIS_MODULE, | |
744 | .open = rbd_open, | |
dfc5606d | 745 | .release = rbd_release, |
131fd9f6 GZ |
746 | .ioctl = rbd_ioctl, |
747 | #ifdef CONFIG_COMPAT | |
748 | .compat_ioctl = rbd_compat_ioctl, | |
749 | #endif | |
602adf40 YS |
750 | }; |
751 | ||
752 | /* | |
7262cfca | 753 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 754 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 755 | */ |
f8c38929 | 756 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
757 | { |
758 | struct rbd_client *rbdc; | |
759 | int ret = -ENOMEM; | |
760 | ||
37206ee5 | 761 | dout("%s:\n", __func__); |
602adf40 YS |
762 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
763 | if (!rbdc) | |
764 | goto out_opt; | |
765 | ||
766 | kref_init(&rbdc->kref); | |
767 | INIT_LIST_HEAD(&rbdc->node); | |
768 | ||
74da4a0f | 769 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 770 | if (IS_ERR(rbdc->client)) |
08f75463 | 771 | goto out_rbdc; |
43ae4701 | 772 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
773 | |
774 | ret = ceph_open_session(rbdc->client); | |
775 | if (ret < 0) | |
08f75463 | 776 | goto out_client; |
602adf40 | 777 | |
432b8587 | 778 | spin_lock(&rbd_client_list_lock); |
602adf40 | 779 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 780 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 781 | |
37206ee5 | 782 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 783 | |
602adf40 | 784 | return rbdc; |
08f75463 | 785 | out_client: |
602adf40 | 786 | ceph_destroy_client(rbdc->client); |
08f75463 | 787 | out_rbdc: |
602adf40 YS |
788 | kfree(rbdc); |
789 | out_opt: | |
43ae4701 AE |
790 | if (ceph_opts) |
791 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
792 | dout("%s: error %d\n", __func__, ret); |
793 | ||
28f259b7 | 794 | return ERR_PTR(ret); |
602adf40 YS |
795 | } |
796 | ||
2f82ee54 AE |
797 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
798 | { | |
799 | kref_get(&rbdc->kref); | |
800 | ||
801 | return rbdc; | |
802 | } | |
803 | ||
602adf40 | 804 | /* |
1f7ba331 AE |
805 | * Find a ceph client with specific addr and configuration. If |
806 | * found, bump its reference count. | |
602adf40 | 807 | */ |
1f7ba331 | 808 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
809 | { |
810 | struct rbd_client *client_node; | |
1f7ba331 | 811 | bool found = false; |
602adf40 | 812 | |
43ae4701 | 813 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
814 | return NULL; |
815 | ||
1f7ba331 AE |
816 | spin_lock(&rbd_client_list_lock); |
817 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
818 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
819 | __rbd_get_client(client_node); |
820 | ||
1f7ba331 AE |
821 | found = true; |
822 | break; | |
823 | } | |
824 | } | |
825 | spin_unlock(&rbd_client_list_lock); | |
826 | ||
827 | return found ? client_node : NULL; | |
602adf40 YS |
828 | } |
829 | ||
59c2be1e | 830 | /* |
210c104c | 831 | * (Per device) rbd map options |
59c2be1e YS |
832 | */ |
833 | enum { | |
b5584180 | 834 | Opt_queue_depth, |
0c93e1b7 | 835 | Opt_alloc_size, |
34f55d0b | 836 | Opt_lock_timeout, |
59c2be1e | 837 | /* int args above */ |
b26c047b | 838 | Opt_pool_ns, |
dc1dad8e | 839 | Opt_compression_hint, |
59c2be1e | 840 | /* string args above */ |
cc0538b6 AE |
841 | Opt_read_only, |
842 | Opt_read_write, | |
80de1912 | 843 | Opt_lock_on_read, |
e010dd0a | 844 | Opt_exclusive, |
d9360540 | 845 | Opt_notrim, |
59c2be1e YS |
846 | }; |
847 | ||
dc1dad8e ID |
848 | enum { |
849 | Opt_compression_hint_none, | |
850 | Opt_compression_hint_compressible, | |
851 | Opt_compression_hint_incompressible, | |
852 | }; | |
853 | ||
854 | static const struct constant_table rbd_param_compression_hint[] = { | |
855 | {"none", Opt_compression_hint_none}, | |
856 | {"compressible", Opt_compression_hint_compressible}, | |
857 | {"incompressible", Opt_compression_hint_incompressible}, | |
858 | {} | |
859 | }; | |
860 | ||
d7167b14 | 861 | static const struct fs_parameter_spec rbd_parameters[] = { |
82995cc6 | 862 | fsparam_u32 ("alloc_size", Opt_alloc_size), |
dc1dad8e ID |
863 | fsparam_enum ("compression_hint", Opt_compression_hint, |
864 | rbd_param_compression_hint), | |
82995cc6 DH |
865 | fsparam_flag ("exclusive", Opt_exclusive), |
866 | fsparam_flag ("lock_on_read", Opt_lock_on_read), | |
867 | fsparam_u32 ("lock_timeout", Opt_lock_timeout), | |
868 | fsparam_flag ("notrim", Opt_notrim), | |
869 | fsparam_string ("_pool_ns", Opt_pool_ns), | |
870 | fsparam_u32 ("queue_depth", Opt_queue_depth), | |
871 | fsparam_flag ("read_only", Opt_read_only), | |
872 | fsparam_flag ("read_write", Opt_read_write), | |
873 | fsparam_flag ("ro", Opt_read_only), | |
874 | fsparam_flag ("rw", Opt_read_write), | |
875 | {} | |
876 | }; | |
877 | ||
98571b5a | 878 | struct rbd_options { |
b5584180 | 879 | int queue_depth; |
0c93e1b7 | 880 | int alloc_size; |
34f55d0b | 881 | unsigned long lock_timeout; |
98571b5a | 882 | bool read_only; |
80de1912 | 883 | bool lock_on_read; |
e010dd0a | 884 | bool exclusive; |
d9360540 | 885 | bool trim; |
dc1dad8e ID |
886 | |
887 | u32 alloc_hint_flags; /* CEPH_OSD_OP_ALLOC_HINT_FLAG_* */ | |
98571b5a AE |
888 | }; |
889 | ||
b5584180 | 890 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
0c93e1b7 | 891 | #define RBD_ALLOC_SIZE_DEFAULT (64 * 1024) |
34f55d0b | 892 | #define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
98571b5a | 893 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 894 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 895 | #define RBD_EXCLUSIVE_DEFAULT false |
d9360540 | 896 | #define RBD_TRIM_DEFAULT true |
98571b5a | 897 | |
82995cc6 | 898 | struct rbd_parse_opts_ctx { |
c300156b | 899 | struct rbd_spec *spec; |
82995cc6 | 900 | struct ceph_options *copts; |
c300156b ID |
901 | struct rbd_options *opts; |
902 | }; | |
903 | ||
6d2940c8 GZ |
904 | static char* obj_op_name(enum obj_operation_type op_type) |
905 | { | |
906 | switch (op_type) { | |
907 | case OBJ_OP_READ: | |
908 | return "read"; | |
909 | case OBJ_OP_WRITE: | |
910 | return "write"; | |
90e98c52 GZ |
911 | case OBJ_OP_DISCARD: |
912 | return "discard"; | |
6484cbe9 ID |
913 | case OBJ_OP_ZEROOUT: |
914 | return "zeroout"; | |
6d2940c8 GZ |
915 | default: |
916 | return "???"; | |
917 | } | |
918 | } | |
919 | ||
602adf40 YS |
920 | /* |
921 | * Destroy ceph client | |
d23a4b3f | 922 | * |
432b8587 | 923 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
924 | */ |
925 | static void rbd_client_release(struct kref *kref) | |
926 | { | |
927 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
928 | ||
37206ee5 | 929 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 930 | spin_lock(&rbd_client_list_lock); |
602adf40 | 931 | list_del(&rbdc->node); |
cd9d9f5d | 932 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
933 | |
934 | ceph_destroy_client(rbdc->client); | |
935 | kfree(rbdc); | |
936 | } | |
937 | ||
938 | /* | |
939 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
940 | * it. | |
941 | */ | |
9d3997fd | 942 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 943 | { |
c53d5893 AE |
944 | if (rbdc) |
945 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
946 | } |
947 | ||
5feb0d8d ID |
948 | /* |
949 | * Get a ceph client with specific addr and configuration, if one does | |
950 | * not exist create it. Either way, ceph_opts is consumed by this | |
951 | * function. | |
952 | */ | |
953 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) | |
954 | { | |
955 | struct rbd_client *rbdc; | |
dd435855 | 956 | int ret; |
5feb0d8d | 957 | |
a32e4143 | 958 | mutex_lock(&client_mutex); |
5feb0d8d | 959 | rbdc = rbd_client_find(ceph_opts); |
dd435855 | 960 | if (rbdc) { |
5feb0d8d | 961 | ceph_destroy_options(ceph_opts); |
dd435855 ID |
962 | |
963 | /* | |
964 | * Using an existing client. Make sure ->pg_pools is up to | |
965 | * date before we look up the pool id in do_rbd_add(). | |
966 | */ | |
9d4a227f ID |
967 | ret = ceph_wait_for_latest_osdmap(rbdc->client, |
968 | rbdc->client->options->mount_timeout); | |
dd435855 ID |
969 | if (ret) { |
970 | rbd_warn(NULL, "failed to get latest osdmap: %d", ret); | |
971 | rbd_put_client(rbdc); | |
972 | rbdc = ERR_PTR(ret); | |
973 | } | |
974 | } else { | |
5feb0d8d | 975 | rbdc = rbd_client_create(ceph_opts); |
dd435855 | 976 | } |
5feb0d8d ID |
977 | mutex_unlock(&client_mutex); |
978 | ||
979 | return rbdc; | |
980 | } | |
981 | ||
a30b71b9 AE |
982 | static bool rbd_image_format_valid(u32 image_format) |
983 | { | |
984 | return image_format == 1 || image_format == 2; | |
985 | } | |
986 | ||
8e94af8e AE |
987 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
988 | { | |
103a150f AE |
989 | size_t size; |
990 | u32 snap_count; | |
991 | ||
992 | /* The header has to start with the magic rbd header text */ | |
993 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
994 | return false; | |
995 | ||
db2388b6 AE |
996 | /* The bio layer requires at least sector-sized I/O */ |
997 | ||
998 | if (ondisk->options.order < SECTOR_SHIFT) | |
999 | return false; | |
1000 | ||
1001 | /* If we use u64 in a few spots we may be able to loosen this */ | |
1002 | ||
1003 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
1004 | return false; | |
1005 | ||
103a150f AE |
1006 | /* |
1007 | * The size of a snapshot header has to fit in a size_t, and | |
1008 | * that limits the number of snapshots. | |
1009 | */ | |
1010 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1011 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
1012 | if (snap_count > size / sizeof (__le64)) | |
1013 | return false; | |
1014 | ||
1015 | /* | |
1016 | * Not only that, but the size of the entire the snapshot | |
1017 | * header must also be representable in a size_t. | |
1018 | */ | |
1019 | size -= snap_count * sizeof (__le64); | |
1020 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
1021 | return false; | |
1022 | ||
1023 | return true; | |
8e94af8e AE |
1024 | } |
1025 | ||
5bc3fb17 ID |
1026 | /* |
1027 | * returns the size of an object in the image | |
1028 | */ | |
1029 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
1030 | { | |
1031 | return 1U << header->obj_order; | |
1032 | } | |
1033 | ||
263423f8 ID |
1034 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
1035 | { | |
1036 | if (rbd_dev->header.stripe_unit == 0 || | |
1037 | rbd_dev->header.stripe_count == 0) { | |
1038 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
1039 | rbd_dev->header.stripe_count = 1; | |
1040 | } | |
1041 | ||
1042 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
1043 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
1044 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
1045 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
1046 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
1047 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
1048 | } | |
1049 | ||
602adf40 | 1050 | /* |
bb23e37a AE |
1051 | * Fill an rbd image header with information from the given format 1 |
1052 | * on-disk header. | |
602adf40 | 1053 | */ |
662518b1 | 1054 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 1055 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 1056 | { |
662518b1 | 1057 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
1058 | bool first_time = header->object_prefix == NULL; |
1059 | struct ceph_snap_context *snapc; | |
1060 | char *object_prefix = NULL; | |
1061 | char *snap_names = NULL; | |
1062 | u64 *snap_sizes = NULL; | |
ccece235 | 1063 | u32 snap_count; |
bb23e37a | 1064 | int ret = -ENOMEM; |
621901d6 | 1065 | u32 i; |
602adf40 | 1066 | |
bb23e37a | 1067 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1068 | |
bb23e37a | 1069 | if (first_time) { |
848d796c ID |
1070 | object_prefix = kstrndup(ondisk->object_prefix, |
1071 | sizeof(ondisk->object_prefix), | |
1072 | GFP_KERNEL); | |
bb23e37a AE |
1073 | if (!object_prefix) |
1074 | return -ENOMEM; | |
bb23e37a | 1075 | } |
00f1f36f | 1076 | |
bb23e37a | 1077 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1078 | |
bb23e37a AE |
1079 | snap_count = le32_to_cpu(ondisk->snap_count); |
1080 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1081 | if (!snapc) | |
1082 | goto out_err; | |
1083 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1084 | if (snap_count) { |
bb23e37a | 1085 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1086 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1087 | ||
bb23e37a | 1088 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1089 | |
bb23e37a AE |
1090 | if (snap_names_len > (u64)SIZE_MAX) |
1091 | goto out_2big; | |
1092 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1093 | if (!snap_names) | |
6a52325f AE |
1094 | goto out_err; |
1095 | ||
bb23e37a | 1096 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1097 | snap_sizes = kmalloc_array(snap_count, |
1098 | sizeof(*header->snap_sizes), | |
1099 | GFP_KERNEL); | |
bb23e37a | 1100 | if (!snap_sizes) |
6a52325f | 1101 | goto out_err; |
bb23e37a | 1102 | |
f785cc1d | 1103 | /* |
bb23e37a AE |
1104 | * Copy the names, and fill in each snapshot's id |
1105 | * and size. | |
1106 | * | |
99a41ebc | 1107 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1108 | * ondisk buffer we're working with has |
f785cc1d AE |
1109 | * snap_names_len bytes beyond the end of the |
1110 | * snapshot id array, this memcpy() is safe. | |
1111 | */ | |
bb23e37a AE |
1112 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1113 | snaps = ondisk->snaps; | |
1114 | for (i = 0; i < snap_count; i++) { | |
1115 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1116 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1117 | } | |
602adf40 | 1118 | } |
6a52325f | 1119 | |
bb23e37a | 1120 | /* We won't fail any more, fill in the header */ |
621901d6 | 1121 | |
bb23e37a AE |
1122 | if (first_time) { |
1123 | header->object_prefix = object_prefix; | |
1124 | header->obj_order = ondisk->options.order; | |
263423f8 | 1125 | rbd_init_layout(rbd_dev); |
602adf40 | 1126 | } else { |
662518b1 AE |
1127 | ceph_put_snap_context(header->snapc); |
1128 | kfree(header->snap_names); | |
1129 | kfree(header->snap_sizes); | |
602adf40 | 1130 | } |
849b4260 | 1131 | |
bb23e37a | 1132 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1133 | |
f84344f3 | 1134 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1135 | header->snapc = snapc; |
1136 | header->snap_names = snap_names; | |
1137 | header->snap_sizes = snap_sizes; | |
468521c1 | 1138 | |
602adf40 | 1139 | return 0; |
bb23e37a AE |
1140 | out_2big: |
1141 | ret = -EIO; | |
6a52325f | 1142 | out_err: |
bb23e37a AE |
1143 | kfree(snap_sizes); |
1144 | kfree(snap_names); | |
1145 | ceph_put_snap_context(snapc); | |
1146 | kfree(object_prefix); | |
ccece235 | 1147 | |
bb23e37a | 1148 | return ret; |
602adf40 YS |
1149 | } |
1150 | ||
9682fc6d AE |
1151 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1152 | { | |
1153 | const char *snap_name; | |
1154 | ||
1155 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1156 | ||
1157 | /* Skip over names until we find the one we are looking for */ | |
1158 | ||
1159 | snap_name = rbd_dev->header.snap_names; | |
1160 | while (which--) | |
1161 | snap_name += strlen(snap_name) + 1; | |
1162 | ||
1163 | return kstrdup(snap_name, GFP_KERNEL); | |
1164 | } | |
1165 | ||
30d1cff8 AE |
1166 | /* |
1167 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1168 | * Note that result is for snapshots in *descending* order. | |
1169 | */ | |
1170 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1171 | { | |
1172 | u64 snap_id1 = *(u64 *)s1; | |
1173 | u64 snap_id2 = *(u64 *)s2; | |
1174 | ||
1175 | if (snap_id1 < snap_id2) | |
1176 | return 1; | |
1177 | return snap_id1 == snap_id2 ? 0 : -1; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Search a snapshot context to see if the given snapshot id is | |
1182 | * present. | |
1183 | * | |
1184 | * Returns the position of the snapshot id in the array if it's found, | |
1185 | * or BAD_SNAP_INDEX otherwise. | |
1186 | * | |
1187 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1188 | * reverse order, highest snapshot id first. | |
1189 | */ | |
9682fc6d AE |
1190 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1191 | { | |
1192 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1193 | u64 *found; |
9682fc6d | 1194 | |
30d1cff8 AE |
1195 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1196 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1197 | |
30d1cff8 | 1198 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1199 | } |
1200 | ||
2ad3d716 AE |
1201 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1202 | u64 snap_id) | |
9e15b77d | 1203 | { |
54cac61f | 1204 | u32 which; |
da6a6b63 | 1205 | const char *snap_name; |
9e15b77d | 1206 | |
54cac61f AE |
1207 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1208 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1209 | return ERR_PTR(-ENOENT); |
54cac61f | 1210 | |
da6a6b63 JD |
1211 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1212 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1213 | } |
1214 | ||
1215 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1216 | { | |
9e15b77d AE |
1217 | if (snap_id == CEPH_NOSNAP) |
1218 | return RBD_SNAP_HEAD_NAME; | |
1219 | ||
54cac61f AE |
1220 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1221 | if (rbd_dev->image_format == 1) | |
1222 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1223 | |
54cac61f | 1224 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1225 | } |
1226 | ||
2ad3d716 AE |
1227 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1228 | u64 *snap_size) | |
602adf40 | 1229 | { |
2ad3d716 AE |
1230 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1231 | if (snap_id == CEPH_NOSNAP) { | |
1232 | *snap_size = rbd_dev->header.image_size; | |
1233 | } else if (rbd_dev->image_format == 1) { | |
1234 | u32 which; | |
602adf40 | 1235 | |
2ad3d716 AE |
1236 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1237 | if (which == BAD_SNAP_INDEX) | |
1238 | return -ENOENT; | |
e86924a8 | 1239 | |
2ad3d716 AE |
1240 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1241 | } else { | |
1242 | u64 size = 0; | |
1243 | int ret; | |
1244 | ||
1245 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1246 | if (ret) | |
1247 | return ret; | |
1248 | ||
1249 | *snap_size = size; | |
1250 | } | |
1251 | return 0; | |
602adf40 YS |
1252 | } |
1253 | ||
2ad3d716 AE |
1254 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
1255 | { | |
8f4b7d98 | 1256 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 | 1257 | u64 size = 0; |
2ad3d716 AE |
1258 | int ret; |
1259 | ||
2ad3d716 | 1260 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
2ad3d716 AE |
1261 | if (ret) |
1262 | return ret; | |
1263 | ||
1264 | rbd_dev->mapping.size = size; | |
8b0241f8 | 1265 | return 0; |
602adf40 YS |
1266 | } |
1267 | ||
d1cf5788 AE |
1268 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1269 | { | |
1270 | rbd_dev->mapping.size = 0; | |
200a6a8b AE |
1271 | } |
1272 | ||
5359a17d | 1273 | static void zero_bvec(struct bio_vec *bv) |
602adf40 | 1274 | { |
602adf40 | 1275 | void *buf; |
5359a17d | 1276 | unsigned long flags; |
602adf40 | 1277 | |
5359a17d ID |
1278 | buf = bvec_kmap_irq(bv, &flags); |
1279 | memset(buf, 0, bv->bv_len); | |
1280 | flush_dcache_page(bv->bv_page); | |
1281 | bvec_kunmap_irq(buf, &flags); | |
602adf40 YS |
1282 | } |
1283 | ||
5359a17d | 1284 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
b9434c5b | 1285 | { |
5359a17d | 1286 | struct ceph_bio_iter it = *bio_pos; |
b9434c5b | 1287 | |
5359a17d ID |
1288 | ceph_bio_iter_advance(&it, off); |
1289 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1290 | zero_bvec(&bv); | |
1291 | })); | |
b9434c5b AE |
1292 | } |
1293 | ||
7e07efb1 | 1294 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
602adf40 | 1295 | { |
7e07efb1 | 1296 | struct ceph_bvec_iter it = *bvec_pos; |
602adf40 | 1297 | |
7e07efb1 ID |
1298 | ceph_bvec_iter_advance(&it, off); |
1299 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1300 | zero_bvec(&bv); | |
1301 | })); | |
f7760dad AE |
1302 | } |
1303 | ||
1304 | /* | |
3da691bf | 1305 | * Zero a range in @obj_req data buffer defined by a bio (list) or |
afb97888 | 1306 | * (private) bio_vec array. |
f7760dad | 1307 | * |
3da691bf | 1308 | * @off is relative to the start of the data buffer. |
926f9b3f | 1309 | */ |
3da691bf ID |
1310 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
1311 | u32 bytes) | |
926f9b3f | 1312 | { |
54ab3b24 ID |
1313 | dout("%s %p data buf %u~%u\n", __func__, obj_req, off, bytes); |
1314 | ||
ecc633ca | 1315 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1316 | case OBJ_REQUEST_BIO: |
1317 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1318 | break; | |
1319 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1320 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf ID |
1321 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
1322 | break; | |
1323 | default: | |
16809372 | 1324 | BUG(); |
6365d33a AE |
1325 | } |
1326 | } | |
1327 | ||
bf0d5f50 AE |
1328 | static void rbd_obj_request_destroy(struct kref *kref); |
1329 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1330 | { | |
1331 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1332 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1333 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1334 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1335 | } | |
1336 | ||
bf0d5f50 AE |
1337 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
1338 | struct rbd_obj_request *obj_request) | |
1339 | { | |
25dcf954 AE |
1340 | rbd_assert(obj_request->img_request == NULL); |
1341 | ||
b155e86c | 1342 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1343 | obj_request->img_request = img_request; |
15961b44 | 1344 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
bf0d5f50 AE |
1345 | } |
1346 | ||
1347 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1348 | struct rbd_obj_request *obj_request) | |
1349 | { | |
15961b44 | 1350 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
43df3d35 | 1351 | list_del(&obj_request->ex.oe_item); |
bf0d5f50 | 1352 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 AE |
1353 | rbd_obj_request_put(obj_request); |
1354 | } | |
1355 | ||
a086a1b8 | 1356 | static void rbd_osd_submit(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1357 | { |
a086a1b8 | 1358 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
980917fc | 1359 | |
a086a1b8 ID |
1360 | dout("%s osd_req %p for obj_req %p objno %llu %llu~%llu\n", |
1361 | __func__, osd_req, obj_req, obj_req->ex.oe_objno, | |
1362 | obj_req->ex.oe_off, obj_req->ex.oe_len); | |
980917fc | 1363 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1364 | } |
1365 | ||
0c425248 AE |
1366 | /* |
1367 | * The default/initial value for all image request flags is 0. Each | |
1368 | * is conditionally set to 1 at image request initialization time | |
1369 | * and currently never change thereafter. | |
1370 | */ | |
d0b2e944 AE |
1371 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1372 | { | |
1373 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
d0b2e944 AE |
1374 | } |
1375 | ||
1376 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1377 | { | |
d0b2e944 AE |
1378 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; |
1379 | } | |
1380 | ||
3da691bf | 1381 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
6e2a4505 | 1382 | { |
3da691bf | 1383 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
b9434c5b | 1384 | |
43df3d35 ID |
1385 | return !obj_req->ex.oe_off && |
1386 | obj_req->ex.oe_len == rbd_dev->layout.object_size; | |
6e2a4505 AE |
1387 | } |
1388 | ||
3da691bf | 1389 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1390 | { |
3da691bf | 1391 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
bf0d5f50 | 1392 | |
43df3d35 | 1393 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
3da691bf | 1394 | rbd_dev->layout.object_size; |
0dcc685e ID |
1395 | } |
1396 | ||
13488d53 ID |
1397 | /* |
1398 | * Must be called after rbd_obj_calc_img_extents(). | |
1399 | */ | |
1400 | static bool rbd_obj_copyup_enabled(struct rbd_obj_request *obj_req) | |
1401 | { | |
1402 | if (!obj_req->num_img_extents || | |
9b17eb2c ID |
1403 | (rbd_obj_is_entire(obj_req) && |
1404 | !obj_req->img_request->snapc->num_snaps)) | |
13488d53 ID |
1405 | return false; |
1406 | ||
1407 | return true; | |
1408 | } | |
1409 | ||
86bd7998 | 1410 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1411 | { |
86bd7998 ID |
1412 | return ceph_file_extents_bytes(obj_req->img_extents, |
1413 | obj_req->num_img_extents); | |
bf0d5f50 AE |
1414 | } |
1415 | ||
3da691bf | 1416 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
bf0d5f50 | 1417 | { |
9bb0248d | 1418 | switch (img_req->op_type) { |
3da691bf ID |
1419 | case OBJ_OP_READ: |
1420 | return false; | |
1421 | case OBJ_OP_WRITE: | |
1422 | case OBJ_OP_DISCARD: | |
6484cbe9 | 1423 | case OBJ_OP_ZEROOUT: |
3da691bf ID |
1424 | return true; |
1425 | default: | |
c6244b3b | 1426 | BUG(); |
3da691bf | 1427 | } |
90e98c52 GZ |
1428 | } |
1429 | ||
85e084fe | 1430 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1431 | { |
3da691bf | 1432 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
54ab3b24 | 1433 | int result; |
bf0d5f50 | 1434 | |
3da691bf ID |
1435 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1436 | osd_req->r_result, obj_req); | |
bf0d5f50 | 1437 | |
54ab3b24 ID |
1438 | /* |
1439 | * Writes aren't allowed to return a data payload. In some | |
1440 | * guarded write cases (e.g. stat + zero on an empty object) | |
1441 | * a stat response makes it through, but we don't care. | |
1442 | */ | |
1443 | if (osd_req->r_result > 0 && rbd_img_is_write(obj_req->img_request)) | |
1444 | result = 0; | |
3da691bf | 1445 | else |
54ab3b24 | 1446 | result = osd_req->r_result; |
bf0d5f50 | 1447 | |
54ab3b24 | 1448 | rbd_obj_handle_request(obj_req, result); |
bf0d5f50 AE |
1449 | } |
1450 | ||
bcbab1db | 1451 | static void rbd_osd_format_read(struct ceph_osd_request *osd_req) |
430c28c3 | 1452 | { |
bcbab1db | 1453 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
22d2cfdf ID |
1454 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
1455 | struct ceph_options *opt = rbd_dev->rbd_client->client->options; | |
430c28c3 | 1456 | |
22d2cfdf | 1457 | osd_req->r_flags = CEPH_OSD_FLAG_READ | opt->read_from_replica; |
7c84883a | 1458 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1459 | } |
1460 | ||
bcbab1db | 1461 | static void rbd_osd_format_write(struct ceph_osd_request *osd_req) |
9d4df01f | 1462 | { |
bcbab1db | 1463 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
9d4df01f | 1464 | |
a162b308 | 1465 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
fac02ddf | 1466 | ktime_get_real_ts64(&osd_req->r_mtime); |
43df3d35 | 1467 | osd_req->r_data_offset = obj_request->ex.oe_off; |
430c28c3 AE |
1468 | } |
1469 | ||
bc81207e | 1470 | static struct ceph_osd_request * |
bcbab1db ID |
1471 | __rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, |
1472 | struct ceph_snap_context *snapc, int num_ops) | |
bc81207e | 1473 | { |
e28eded5 | 1474 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
bc81207e ID |
1475 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1476 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1477 | const char *name_format = rbd_dev->image_format == 1 ? |
1478 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bcbab1db | 1479 | int ret; |
bc81207e | 1480 | |
e28eded5 | 1481 | req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO); |
bc81207e | 1482 | if (!req) |
bcbab1db | 1483 | return ERR_PTR(-ENOMEM); |
bc81207e | 1484 | |
bcbab1db | 1485 | list_add_tail(&req->r_private_item, &obj_req->osd_reqs); |
bc81207e | 1486 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1487 | req->r_priv = obj_req; |
bc81207e | 1488 | |
b26c047b ID |
1489 | /* |
1490 | * Data objects may be stored in a separate pool, but always in | |
1491 | * the same namespace in that pool as the header in its pool. | |
1492 | */ | |
1493 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); | |
bc81207e | 1494 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
b26c047b | 1495 | |
bcbab1db ID |
1496 | ret = ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
1497 | rbd_dev->header.object_prefix, | |
1498 | obj_req->ex.oe_objno); | |
1499 | if (ret) | |
1500 | return ERR_PTR(ret); | |
bc81207e | 1501 | |
bc81207e | 1502 | return req; |
bc81207e ID |
1503 | } |
1504 | ||
e28eded5 | 1505 | static struct ceph_osd_request * |
bcbab1db | 1506 | rbd_obj_add_osd_request(struct rbd_obj_request *obj_req, int num_ops) |
bf0d5f50 | 1507 | { |
bcbab1db ID |
1508 | return __rbd_obj_add_osd_request(obj_req, obj_req->img_request->snapc, |
1509 | num_ops); | |
bf0d5f50 AE |
1510 | } |
1511 | ||
ecc633ca | 1512 | static struct rbd_obj_request *rbd_obj_request_create(void) |
bf0d5f50 AE |
1513 | { |
1514 | struct rbd_obj_request *obj_request; | |
bf0d5f50 | 1515 | |
5a60e876 | 1516 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1517 | if (!obj_request) |
f907ad55 | 1518 | return NULL; |
f907ad55 | 1519 | |
43df3d35 | 1520 | ceph_object_extent_init(&obj_request->ex); |
bcbab1db | 1521 | INIT_LIST_HEAD(&obj_request->osd_reqs); |
85b5e6d1 | 1522 | mutex_init(&obj_request->state_mutex); |
bf0d5f50 AE |
1523 | kref_init(&obj_request->kref); |
1524 | ||
67e2b652 | 1525 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1526 | return obj_request; |
1527 | } | |
1528 | ||
1529 | static void rbd_obj_request_destroy(struct kref *kref) | |
1530 | { | |
1531 | struct rbd_obj_request *obj_request; | |
bcbab1db | 1532 | struct ceph_osd_request *osd_req; |
7e07efb1 | 1533 | u32 i; |
bf0d5f50 AE |
1534 | |
1535 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1536 | ||
37206ee5 AE |
1537 | dout("%s: obj %p\n", __func__, obj_request); |
1538 | ||
bcbab1db ID |
1539 | while (!list_empty(&obj_request->osd_reqs)) { |
1540 | osd_req = list_first_entry(&obj_request->osd_reqs, | |
1541 | struct ceph_osd_request, r_private_item); | |
1542 | list_del_init(&osd_req->r_private_item); | |
1543 | ceph_osdc_put_request(osd_req); | |
1544 | } | |
bf0d5f50 | 1545 | |
ecc633ca | 1546 | switch (obj_request->img_request->data_type) { |
9969ebc5 | 1547 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1548 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1549 | case OBJ_REQUEST_BVECS: |
5359a17d | 1550 | break; /* Nothing to do */ |
afb97888 ID |
1551 | case OBJ_REQUEST_OWN_BVECS: |
1552 | kfree(obj_request->bvec_pos.bvecs); | |
788e2df3 | 1553 | break; |
7e07efb1 | 1554 | default: |
16809372 | 1555 | BUG(); |
bf0d5f50 AE |
1556 | } |
1557 | ||
86bd7998 | 1558 | kfree(obj_request->img_extents); |
7e07efb1 ID |
1559 | if (obj_request->copyup_bvecs) { |
1560 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1561 | if (obj_request->copyup_bvecs[i].bv_page) | |
1562 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1563 | } | |
1564 | kfree(obj_request->copyup_bvecs); | |
bf0d5f50 AE |
1565 | } |
1566 | ||
868311b1 | 1567 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1568 | } |
1569 | ||
fb65d228 AE |
1570 | /* It's OK to call this for a device with no parent */ |
1571 | ||
1572 | static void rbd_spec_put(struct rbd_spec *spec); | |
1573 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1574 | { | |
1575 | rbd_dev_remove_parent(rbd_dev); | |
1576 | rbd_spec_put(rbd_dev->parent_spec); | |
1577 | rbd_dev->parent_spec = NULL; | |
1578 | rbd_dev->parent_overlap = 0; | |
1579 | } | |
1580 | ||
a2acd00e AE |
1581 | /* |
1582 | * Parent image reference counting is used to determine when an | |
1583 | * image's parent fields can be safely torn down--after there are no | |
1584 | * more in-flight requests to the parent image. When the last | |
1585 | * reference is dropped, cleaning them up is safe. | |
1586 | */ | |
1587 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1588 | { | |
1589 | int counter; | |
1590 | ||
1591 | if (!rbd_dev->parent_spec) | |
1592 | return; | |
1593 | ||
1594 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1595 | if (counter > 0) | |
1596 | return; | |
1597 | ||
1598 | /* Last reference; clean up parent data structures */ | |
1599 | ||
1600 | if (!counter) | |
1601 | rbd_dev_unparent(rbd_dev); | |
1602 | else | |
9584d508 | 1603 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1604 | } |
1605 | ||
1606 | /* | |
1607 | * If an image has a non-zero parent overlap, get a reference to its | |
1608 | * parent. | |
1609 | * | |
1610 | * Returns true if the rbd device has a parent with a non-zero | |
1611 | * overlap and a reference for it was successfully taken, or | |
1612 | * false otherwise. | |
1613 | */ | |
1614 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1615 | { | |
ae43e9d0 | 1616 | int counter = 0; |
a2acd00e AE |
1617 | |
1618 | if (!rbd_dev->parent_spec) | |
1619 | return false; | |
1620 | ||
ae43e9d0 ID |
1621 | if (rbd_dev->parent_overlap) |
1622 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
a2acd00e AE |
1623 | |
1624 | if (counter < 0) | |
9584d508 | 1625 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1626 | |
ae43e9d0 | 1627 | return counter > 0; |
a2acd00e AE |
1628 | } |
1629 | ||
59e542c8 ID |
1630 | static void rbd_img_request_init(struct rbd_img_request *img_request, |
1631 | struct rbd_device *rbd_dev, | |
1632 | enum obj_operation_type op_type) | |
bf0d5f50 | 1633 | { |
59e542c8 | 1634 | memset(img_request, 0, sizeof(*img_request)); |
bf0d5f50 | 1635 | |
bf0d5f50 | 1636 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1637 | img_request->op_type = op_type; |
a0c5895b | 1638 | |
e1fddc8f | 1639 | INIT_LIST_HEAD(&img_request->lock_item); |
43df3d35 | 1640 | INIT_LIST_HEAD(&img_request->object_extents); |
0192ce2e | 1641 | mutex_init(&img_request->state_mutex); |
bf0d5f50 AE |
1642 | } |
1643 | ||
a52cc685 ID |
1644 | static void rbd_img_capture_header(struct rbd_img_request *img_req) |
1645 | { | |
1646 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
1647 | ||
1648 | lockdep_assert_held(&rbd_dev->header_rwsem); | |
1649 | ||
1650 | if (rbd_img_is_write(img_req)) | |
1651 | img_req->snapc = ceph_get_snap_context(rbd_dev->header.snapc); | |
1652 | else | |
1653 | img_req->snap_id = rbd_dev->spec->snap_id; | |
1654 | ||
1655 | if (rbd_dev_parent_get(rbd_dev)) | |
1656 | img_request_layered_set(img_req); | |
1657 | } | |
1658 | ||
679a97d2 | 1659 | static void rbd_img_request_destroy(struct rbd_img_request *img_request) |
bf0d5f50 | 1660 | { |
bf0d5f50 AE |
1661 | struct rbd_obj_request *obj_request; |
1662 | struct rbd_obj_request *next_obj_request; | |
1663 | ||
37206ee5 AE |
1664 | dout("%s: img %p\n", __func__, img_request); |
1665 | ||
e1fddc8f | 1666 | WARN_ON(!list_empty(&img_request->lock_item)); |
bf0d5f50 AE |
1667 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1668 | rbd_img_obj_request_del(img_request, obj_request); | |
1669 | ||
78b42a87 | 1670 | if (img_request_layered_test(img_request)) |
a2acd00e | 1671 | rbd_dev_parent_put(img_request->rbd_dev); |
a2acd00e | 1672 | |
9bb0248d | 1673 | if (rbd_img_is_write(img_request)) |
812164f8 | 1674 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1675 | |
59e542c8 ID |
1676 | if (test_bit(IMG_REQ_CHILD, &img_request->flags)) |
1677 | kmem_cache_free(rbd_img_request_cache, img_request); | |
bf0d5f50 AE |
1678 | } |
1679 | ||
22e8bd51 ID |
1680 | #define BITS_PER_OBJ 2 |
1681 | #define OBJS_PER_BYTE (BITS_PER_BYTE / BITS_PER_OBJ) | |
1682 | #define OBJ_MASK ((1 << BITS_PER_OBJ) - 1) | |
e93f3152 | 1683 | |
22e8bd51 ID |
1684 | static void __rbd_object_map_index(struct rbd_device *rbd_dev, u64 objno, |
1685 | u64 *index, u8 *shift) | |
1686 | { | |
1687 | u32 off; | |
e93f3152 | 1688 | |
22e8bd51 ID |
1689 | rbd_assert(objno < rbd_dev->object_map_size); |
1690 | *index = div_u64_rem(objno, OBJS_PER_BYTE, &off); | |
1691 | *shift = (OBJS_PER_BYTE - off - 1) * BITS_PER_OBJ; | |
1692 | } | |
e93f3152 | 1693 | |
22e8bd51 ID |
1694 | static u8 __rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
1695 | { | |
1696 | u64 index; | |
1697 | u8 shift; | |
e93f3152 | 1698 | |
22e8bd51 ID |
1699 | lockdep_assert_held(&rbd_dev->object_map_lock); |
1700 | __rbd_object_map_index(rbd_dev, objno, &index, &shift); | |
1701 | return (rbd_dev->object_map[index] >> shift) & OBJ_MASK; | |
e93f3152 AE |
1702 | } |
1703 | ||
22e8bd51 | 1704 | static void __rbd_object_map_set(struct rbd_device *rbd_dev, u64 objno, u8 val) |
e93f3152 | 1705 | { |
22e8bd51 ID |
1706 | u64 index; |
1707 | u8 shift; | |
1708 | u8 *p; | |
e93f3152 | 1709 | |
22e8bd51 ID |
1710 | lockdep_assert_held(&rbd_dev->object_map_lock); |
1711 | rbd_assert(!(val & ~OBJ_MASK)); | |
e93f3152 | 1712 | |
22e8bd51 ID |
1713 | __rbd_object_map_index(rbd_dev, objno, &index, &shift); |
1714 | p = &rbd_dev->object_map[index]; | |
1715 | *p = (*p & ~(OBJ_MASK << shift)) | (val << shift); | |
e93f3152 AE |
1716 | } |
1717 | ||
22e8bd51 | 1718 | static u8 rbd_object_map_get(struct rbd_device *rbd_dev, u64 objno) |
1217857f | 1719 | { |
22e8bd51 ID |
1720 | u8 state; |
1721 | ||
1722 | spin_lock(&rbd_dev->object_map_lock); | |
1723 | state = __rbd_object_map_get(rbd_dev, objno); | |
1724 | spin_unlock(&rbd_dev->object_map_lock); | |
1725 | return state; | |
3da691bf | 1726 | } |
1217857f | 1727 | |
22e8bd51 | 1728 | static bool use_object_map(struct rbd_device *rbd_dev) |
3da691bf | 1729 | { |
3fe69921 ID |
1730 | /* |
1731 | * An image mapped read-only can't use the object map -- it isn't | |
1732 | * loaded because the header lock isn't acquired. Someone else can | |
1733 | * write to the image and update the object map behind our back. | |
1734 | * | |
1735 | * A snapshot can't be written to, so using the object map is always | |
1736 | * safe. | |
1737 | */ | |
1738 | if (!rbd_is_snap(rbd_dev) && rbd_is_ro(rbd_dev)) | |
1739 | return false; | |
1740 | ||
22e8bd51 ID |
1741 | return ((rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) && |
1742 | !(rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID)); | |
3da691bf ID |
1743 | } |
1744 | ||
22e8bd51 | 1745 | static bool rbd_object_map_may_exist(struct rbd_device *rbd_dev, u64 objno) |
3da691bf | 1746 | { |
22e8bd51 | 1747 | u8 state; |
8b3e1a56 | 1748 | |
22e8bd51 ID |
1749 | /* fall back to default logic if object map is disabled or invalid */ |
1750 | if (!use_object_map(rbd_dev)) | |
1751 | return true; | |
3da691bf | 1752 | |
22e8bd51 ID |
1753 | state = rbd_object_map_get(rbd_dev, objno); |
1754 | return state != OBJECT_NONEXISTENT; | |
1217857f AE |
1755 | } |
1756 | ||
22e8bd51 ID |
1757 | static void rbd_object_map_name(struct rbd_device *rbd_dev, u64 snap_id, |
1758 | struct ceph_object_id *oid) | |
13488d53 | 1759 | { |
22e8bd51 ID |
1760 | if (snap_id == CEPH_NOSNAP) |
1761 | ceph_oid_printf(oid, "%s%s", RBD_OBJECT_MAP_PREFIX, | |
1762 | rbd_dev->spec->image_id); | |
1763 | else | |
1764 | ceph_oid_printf(oid, "%s%s.%016llx", RBD_OBJECT_MAP_PREFIX, | |
1765 | rbd_dev->spec->image_id, snap_id); | |
13488d53 ID |
1766 | } |
1767 | ||
22e8bd51 | 1768 | static int rbd_object_map_lock(struct rbd_device *rbd_dev) |
2169238d | 1769 | { |
22e8bd51 ID |
1770 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1771 | CEPH_DEFINE_OID_ONSTACK(oid); | |
1772 | u8 lock_type; | |
1773 | char *lock_tag; | |
1774 | struct ceph_locker *lockers; | |
1775 | u32 num_lockers; | |
1776 | bool broke_lock = false; | |
1777 | int ret; | |
2169238d | 1778 | |
22e8bd51 | 1779 | rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); |
2169238d | 1780 | |
22e8bd51 ID |
1781 | again: |
1782 | ret = ceph_cls_lock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
1783 | CEPH_CLS_LOCK_EXCLUSIVE, "", "", "", 0); | |
1784 | if (ret != -EBUSY || broke_lock) { | |
1785 | if (ret == -EEXIST) | |
1786 | ret = 0; /* already locked by myself */ | |
1787 | if (ret) | |
1788 | rbd_warn(rbd_dev, "failed to lock object map: %d", ret); | |
1789 | return ret; | |
1790 | } | |
2169238d | 1791 | |
22e8bd51 ID |
1792 | ret = ceph_cls_lock_info(osdc, &oid, &rbd_dev->header_oloc, |
1793 | RBD_LOCK_NAME, &lock_type, &lock_tag, | |
1794 | &lockers, &num_lockers); | |
1795 | if (ret) { | |
1796 | if (ret == -ENOENT) | |
1797 | goto again; | |
3da691bf | 1798 | |
22e8bd51 | 1799 | rbd_warn(rbd_dev, "failed to get object map lockers: %d", ret); |
86bd7998 | 1800 | return ret; |
22e8bd51 | 1801 | } |
86bd7998 | 1802 | |
22e8bd51 ID |
1803 | kfree(lock_tag); |
1804 | if (num_lockers == 0) | |
1805 | goto again; | |
2169238d | 1806 | |
22e8bd51 ID |
1807 | rbd_warn(rbd_dev, "breaking object map lock owned by %s%llu", |
1808 | ENTITY_NAME(lockers[0].id.name)); | |
2169238d | 1809 | |
22e8bd51 ID |
1810 | ret = ceph_cls_break_lock(osdc, &oid, &rbd_dev->header_oloc, |
1811 | RBD_LOCK_NAME, lockers[0].id.cookie, | |
1812 | &lockers[0].id.name); | |
1813 | ceph_free_lockers(lockers, num_lockers); | |
1814 | if (ret) { | |
1815 | if (ret == -ENOENT) | |
1816 | goto again; | |
13488d53 | 1817 | |
22e8bd51 ID |
1818 | rbd_warn(rbd_dev, "failed to break object map lock: %d", ret); |
1819 | return ret; | |
3da691bf ID |
1820 | } |
1821 | ||
22e8bd51 ID |
1822 | broke_lock = true; |
1823 | goto again; | |
2169238d AE |
1824 | } |
1825 | ||
22e8bd51 | 1826 | static void rbd_object_map_unlock(struct rbd_device *rbd_dev) |
6484cbe9 | 1827 | { |
22e8bd51 ID |
1828 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1829 | CEPH_DEFINE_OID_ONSTACK(oid); | |
1830 | int ret; | |
1831 | ||
1832 | rbd_object_map_name(rbd_dev, CEPH_NOSNAP, &oid); | |
1833 | ||
1834 | ret = ceph_cls_unlock(osdc, &oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
1835 | ""); | |
1836 | if (ret && ret != -ENOENT) | |
1837 | rbd_warn(rbd_dev, "failed to unlock object map: %d", ret); | |
6484cbe9 ID |
1838 | } |
1839 | ||
22e8bd51 | 1840 | static int decode_object_map_header(void **p, void *end, u64 *object_map_size) |
6484cbe9 | 1841 | { |
22e8bd51 ID |
1842 | u8 struct_v; |
1843 | u32 struct_len; | |
1844 | u32 header_len; | |
1845 | void *header_end; | |
6484cbe9 ID |
1846 | int ret; |
1847 | ||
22e8bd51 ID |
1848 | ceph_decode_32_safe(p, end, header_len, e_inval); |
1849 | header_end = *p + header_len; | |
0c93e1b7 | 1850 | |
22e8bd51 ID |
1851 | ret = ceph_start_decoding(p, end, 1, "BitVector header", &struct_v, |
1852 | &struct_len); | |
6484cbe9 ID |
1853 | if (ret) |
1854 | return ret; | |
1855 | ||
22e8bd51 | 1856 | ceph_decode_64_safe(p, end, *object_map_size, e_inval); |
6484cbe9 | 1857 | |
22e8bd51 | 1858 | *p = header_end; |
6484cbe9 | 1859 | return 0; |
22e8bd51 ID |
1860 | |
1861 | e_inval: | |
1862 | return -EINVAL; | |
6484cbe9 ID |
1863 | } |
1864 | ||
22e8bd51 | 1865 | static int __rbd_object_map_load(struct rbd_device *rbd_dev) |
13488d53 | 1866 | { |
22e8bd51 ID |
1867 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1868 | CEPH_DEFINE_OID_ONSTACK(oid); | |
1869 | struct page **pages; | |
1870 | void *p, *end; | |
1871 | size_t reply_len; | |
1872 | u64 num_objects; | |
1873 | u64 object_map_bytes; | |
1874 | u64 object_map_size; | |
1875 | int num_pages; | |
1876 | int ret; | |
13488d53 | 1877 | |
22e8bd51 | 1878 | rbd_assert(!rbd_dev->object_map && !rbd_dev->object_map_size); |
13488d53 | 1879 | |
22e8bd51 ID |
1880 | num_objects = ceph_get_num_objects(&rbd_dev->layout, |
1881 | rbd_dev->mapping.size); | |
1882 | object_map_bytes = DIV_ROUND_UP_ULL(num_objects * BITS_PER_OBJ, | |
1883 | BITS_PER_BYTE); | |
1884 | num_pages = calc_pages_for(0, object_map_bytes) + 1; | |
1885 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
1886 | if (IS_ERR(pages)) | |
1887 | return PTR_ERR(pages); | |
13488d53 | 1888 | |
22e8bd51 ID |
1889 | reply_len = num_pages * PAGE_SIZE; |
1890 | rbd_object_map_name(rbd_dev, rbd_dev->spec->snap_id, &oid); | |
1891 | ret = ceph_osdc_call(osdc, &oid, &rbd_dev->header_oloc, | |
1892 | "rbd", "object_map_load", CEPH_OSD_FLAG_READ, | |
1893 | NULL, 0, pages, &reply_len); | |
1894 | if (ret) | |
1895 | goto out; | |
3b434a2a | 1896 | |
22e8bd51 ID |
1897 | p = page_address(pages[0]); |
1898 | end = p + min(reply_len, (size_t)PAGE_SIZE); | |
1899 | ret = decode_object_map_header(&p, end, &object_map_size); | |
1900 | if (ret) | |
1901 | goto out; | |
1902 | ||
1903 | if (object_map_size != num_objects) { | |
1904 | rbd_warn(rbd_dev, "object map size mismatch: %llu vs %llu", | |
1905 | object_map_size, num_objects); | |
1906 | ret = -EINVAL; | |
1907 | goto out; | |
3b434a2a JD |
1908 | } |
1909 | ||
22e8bd51 ID |
1910 | if (offset_in_page(p) + object_map_bytes > reply_len) { |
1911 | ret = -EINVAL; | |
1912 | goto out; | |
1913 | } | |
1914 | ||
1915 | rbd_dev->object_map = kvmalloc(object_map_bytes, GFP_KERNEL); | |
1916 | if (!rbd_dev->object_map) { | |
1917 | ret = -ENOMEM; | |
1918 | goto out; | |
1919 | } | |
1920 | ||
1921 | rbd_dev->object_map_size = object_map_size; | |
1922 | ceph_copy_from_page_vector(pages, rbd_dev->object_map, | |
1923 | offset_in_page(p), object_map_bytes); | |
1924 | ||
1925 | out: | |
1926 | ceph_release_page_vector(pages, num_pages); | |
1927 | return ret; | |
1928 | } | |
3da691bf | 1929 | |
22e8bd51 ID |
1930 | static void rbd_object_map_free(struct rbd_device *rbd_dev) |
1931 | { | |
1932 | kvfree(rbd_dev->object_map); | |
1933 | rbd_dev->object_map = NULL; | |
1934 | rbd_dev->object_map_size = 0; | |
3b434a2a JD |
1935 | } |
1936 | ||
22e8bd51 | 1937 | static int rbd_object_map_load(struct rbd_device *rbd_dev) |
bf0d5f50 | 1938 | { |
3da691bf | 1939 | int ret; |
37206ee5 | 1940 | |
22e8bd51 | 1941 | ret = __rbd_object_map_load(rbd_dev); |
86bd7998 ID |
1942 | if (ret) |
1943 | return ret; | |
f1a4739f | 1944 | |
22e8bd51 ID |
1945 | ret = rbd_dev_v2_get_flags(rbd_dev); |
1946 | if (ret) { | |
1947 | rbd_object_map_free(rbd_dev); | |
1948 | return ret; | |
1949 | } | |
1950 | ||
1951 | if (rbd_dev->object_map_flags & RBD_FLAG_OBJECT_MAP_INVALID) | |
1952 | rbd_warn(rbd_dev, "object map is invalid"); | |
1953 | ||
1954 | return 0; | |
1955 | } | |
1956 | ||
1957 | static int rbd_object_map_open(struct rbd_device *rbd_dev) | |
1958 | { | |
1959 | int ret; | |
1960 | ||
1961 | ret = rbd_object_map_lock(rbd_dev); | |
1962 | if (ret) | |
1963 | return ret; | |
1964 | ||
1965 | ret = rbd_object_map_load(rbd_dev); | |
1966 | if (ret) { | |
1967 | rbd_object_map_unlock(rbd_dev); | |
1968 | return ret; | |
1969 | } | |
1970 | ||
1971 | return 0; | |
1972 | } | |
1973 | ||
1974 | static void rbd_object_map_close(struct rbd_device *rbd_dev) | |
1975 | { | |
1976 | rbd_object_map_free(rbd_dev); | |
1977 | rbd_object_map_unlock(rbd_dev); | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * This function needs snap_id (or more precisely just something to | |
1982 | * distinguish between HEAD and snapshot object maps), new_state and | |
1983 | * current_state that were passed to rbd_object_map_update(). | |
1984 | * | |
1985 | * To avoid allocating and stashing a context we piggyback on the OSD | |
1986 | * request. A HEAD update has two ops (assert_locked). For new_state | |
1987 | * and current_state we decode our own object_map_update op, encoded in | |
1988 | * rbd_cls_object_map_update(). | |
1989 | */ | |
1990 | static int rbd_object_map_update_finish(struct rbd_obj_request *obj_req, | |
1991 | struct ceph_osd_request *osd_req) | |
1992 | { | |
1993 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1994 | struct ceph_osd_data *osd_data; | |
1995 | u64 objno; | |
3f649ab7 | 1996 | u8 state, new_state, current_state; |
22e8bd51 ID |
1997 | bool has_current_state; |
1998 | void *p; | |
1999 | ||
2000 | if (osd_req->r_result) | |
2001 | return osd_req->r_result; | |
2002 | ||
2003 | /* | |
2004 | * Nothing to do for a snapshot object map. | |
2005 | */ | |
2006 | if (osd_req->r_num_ops == 1) | |
2007 | return 0; | |
2008 | ||
2009 | /* | |
2010 | * Update in-memory HEAD object map. | |
2011 | */ | |
2012 | rbd_assert(osd_req->r_num_ops == 2); | |
2013 | osd_data = osd_req_op_data(osd_req, 1, cls, request_data); | |
2014 | rbd_assert(osd_data->type == CEPH_OSD_DATA_TYPE_PAGES); | |
2015 | ||
2016 | p = page_address(osd_data->pages[0]); | |
2017 | objno = ceph_decode_64(&p); | |
2018 | rbd_assert(objno == obj_req->ex.oe_objno); | |
2019 | rbd_assert(ceph_decode_64(&p) == objno + 1); | |
2020 | new_state = ceph_decode_8(&p); | |
2021 | has_current_state = ceph_decode_8(&p); | |
2022 | if (has_current_state) | |
2023 | current_state = ceph_decode_8(&p); | |
2024 | ||
2025 | spin_lock(&rbd_dev->object_map_lock); | |
2026 | state = __rbd_object_map_get(rbd_dev, objno); | |
2027 | if (!has_current_state || current_state == state || | |
2028 | (current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) | |
2029 | __rbd_object_map_set(rbd_dev, objno, new_state); | |
2030 | spin_unlock(&rbd_dev->object_map_lock); | |
2031 | ||
2032 | return 0; | |
2033 | } | |
2034 | ||
2035 | static void rbd_object_map_callback(struct ceph_osd_request *osd_req) | |
2036 | { | |
2037 | struct rbd_obj_request *obj_req = osd_req->r_priv; | |
2038 | int result; | |
2039 | ||
2040 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, | |
2041 | osd_req->r_result, obj_req); | |
2042 | ||
2043 | result = rbd_object_map_update_finish(obj_req, osd_req); | |
2044 | rbd_obj_handle_request(obj_req, result); | |
2045 | } | |
2046 | ||
2047 | static bool update_needed(struct rbd_device *rbd_dev, u64 objno, u8 new_state) | |
2048 | { | |
2049 | u8 state = rbd_object_map_get(rbd_dev, objno); | |
bf0d5f50 | 2050 | |
22e8bd51 ID |
2051 | if (state == new_state || |
2052 | (new_state == OBJECT_PENDING && state == OBJECT_NONEXISTENT) || | |
2053 | (new_state == OBJECT_NONEXISTENT && state != OBJECT_PENDING)) | |
2054 | return false; | |
2055 | ||
2056 | return true; | |
2057 | } | |
2058 | ||
2059 | static int rbd_cls_object_map_update(struct ceph_osd_request *req, | |
2060 | int which, u64 objno, u8 new_state, | |
2061 | const u8 *current_state) | |
2062 | { | |
2063 | struct page **pages; | |
2064 | void *p, *start; | |
2065 | int ret; | |
2066 | ||
2067 | ret = osd_req_op_cls_init(req, which, "rbd", "object_map_update"); | |
2068 | if (ret) | |
2069 | return ret; | |
2070 | ||
2071 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
2072 | if (IS_ERR(pages)) | |
2073 | return PTR_ERR(pages); | |
2074 | ||
2075 | p = start = page_address(pages[0]); | |
2076 | ceph_encode_64(&p, objno); | |
2077 | ceph_encode_64(&p, objno + 1); | |
2078 | ceph_encode_8(&p, new_state); | |
2079 | if (current_state) { | |
2080 | ceph_encode_8(&p, 1); | |
2081 | ceph_encode_8(&p, *current_state); | |
2082 | } else { | |
2083 | ceph_encode_8(&p, 0); | |
2084 | } | |
2085 | ||
2086 | osd_req_op_cls_request_data_pages(req, which, pages, p - start, 0, | |
2087 | false, true); | |
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Return: | |
2093 | * 0 - object map update sent | |
2094 | * 1 - object map update isn't needed | |
2095 | * <0 - error | |
2096 | */ | |
2097 | static int rbd_object_map_update(struct rbd_obj_request *obj_req, u64 snap_id, | |
2098 | u8 new_state, const u8 *current_state) | |
2099 | { | |
2100 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2101 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2102 | struct ceph_osd_request *req; | |
2103 | int num_ops = 1; | |
2104 | int which = 0; | |
2105 | int ret; | |
2106 | ||
2107 | if (snap_id == CEPH_NOSNAP) { | |
2108 | if (!update_needed(rbd_dev, obj_req->ex.oe_objno, new_state)) | |
2109 | return 1; | |
2110 | ||
2111 | num_ops++; /* assert_locked */ | |
2112 | } | |
2113 | ||
2114 | req = ceph_osdc_alloc_request(osdc, NULL, num_ops, false, GFP_NOIO); | |
2115 | if (!req) | |
2116 | return -ENOMEM; | |
2117 | ||
2118 | list_add_tail(&req->r_private_item, &obj_req->osd_reqs); | |
2119 | req->r_callback = rbd_object_map_callback; | |
2120 | req->r_priv = obj_req; | |
2121 | ||
2122 | rbd_object_map_name(rbd_dev, snap_id, &req->r_base_oid); | |
2123 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); | |
2124 | req->r_flags = CEPH_OSD_FLAG_WRITE; | |
2125 | ktime_get_real_ts64(&req->r_mtime); | |
2126 | ||
2127 | if (snap_id == CEPH_NOSNAP) { | |
2128 | /* | |
2129 | * Protect against possible race conditions during lock | |
2130 | * ownership transitions. | |
2131 | */ | |
2132 | ret = ceph_cls_assert_locked(req, which++, RBD_LOCK_NAME, | |
2133 | CEPH_CLS_LOCK_EXCLUSIVE, "", ""); | |
3da691bf ID |
2134 | if (ret) |
2135 | return ret; | |
22e8bd51 ID |
2136 | } |
2137 | ||
2138 | ret = rbd_cls_object_map_update(req, which, obj_req->ex.oe_objno, | |
2139 | new_state, current_state); | |
2140 | if (ret) | |
2141 | return ret; | |
2142 | ||
2143 | ret = ceph_osdc_alloc_messages(req, GFP_NOIO); | |
2144 | if (ret) | |
2145 | return ret; | |
13488d53 | 2146 | |
22e8bd51 ID |
2147 | ceph_osdc_start_request(osdc, req, false); |
2148 | return 0; | |
2149 | } | |
2150 | ||
86bd7998 ID |
2151 | static void prune_extents(struct ceph_file_extent *img_extents, |
2152 | u32 *num_img_extents, u64 overlap) | |
e93f3152 | 2153 | { |
86bd7998 | 2154 | u32 cnt = *num_img_extents; |
e93f3152 | 2155 | |
86bd7998 ID |
2156 | /* drop extents completely beyond the overlap */ |
2157 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) | |
2158 | cnt--; | |
e93f3152 | 2159 | |
86bd7998 ID |
2160 | if (cnt) { |
2161 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; | |
e93f3152 | 2162 | |
86bd7998 ID |
2163 | /* trim final overlapping extent */ |
2164 | if (ex->fe_off + ex->fe_len > overlap) | |
2165 | ex->fe_len = overlap - ex->fe_off; | |
2166 | } | |
e93f3152 | 2167 | |
86bd7998 | 2168 | *num_img_extents = cnt; |
e93f3152 AE |
2169 | } |
2170 | ||
86bd7998 ID |
2171 | /* |
2172 | * Determine the byte range(s) covered by either just the object extent | |
2173 | * or the entire object in the parent image. | |
2174 | */ | |
2175 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, | |
2176 | bool entire) | |
e93f3152 | 2177 | { |
86bd7998 ID |
2178 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
2179 | int ret; | |
e93f3152 | 2180 | |
86bd7998 ID |
2181 | if (!rbd_dev->parent_overlap) |
2182 | return 0; | |
e93f3152 | 2183 | |
86bd7998 ID |
2184 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
2185 | entire ? 0 : obj_req->ex.oe_off, | |
2186 | entire ? rbd_dev->layout.object_size : | |
2187 | obj_req->ex.oe_len, | |
2188 | &obj_req->img_extents, | |
2189 | &obj_req->num_img_extents); | |
2190 | if (ret) | |
2191 | return ret; | |
e93f3152 | 2192 | |
86bd7998 ID |
2193 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
2194 | rbd_dev->parent_overlap); | |
2195 | return 0; | |
e93f3152 AE |
2196 | } |
2197 | ||
bcbab1db | 2198 | static void rbd_osd_setup_data(struct ceph_osd_request *osd_req, int which) |
1217857f | 2199 | { |
bcbab1db ID |
2200 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
2201 | ||
ecc633ca | 2202 | switch (obj_req->img_request->data_type) { |
3da691bf | 2203 | case OBJ_REQUEST_BIO: |
bcbab1db | 2204 | osd_req_op_extent_osd_data_bio(osd_req, which, |
3da691bf | 2205 | &obj_req->bio_pos, |
43df3d35 | 2206 | obj_req->ex.oe_len); |
3da691bf ID |
2207 | break; |
2208 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2209 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf | 2210 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
43df3d35 | 2211 | obj_req->ex.oe_len); |
afb97888 | 2212 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
bcbab1db | 2213 | osd_req_op_extent_osd_data_bvec_pos(osd_req, which, |
3da691bf ID |
2214 | &obj_req->bvec_pos); |
2215 | break; | |
2216 | default: | |
16809372 | 2217 | BUG(); |
1217857f | 2218 | } |
3da691bf | 2219 | } |
1217857f | 2220 | |
bcbab1db | 2221 | static int rbd_osd_setup_stat(struct ceph_osd_request *osd_req, int which) |
3da691bf ID |
2222 | { |
2223 | struct page **pages; | |
8b3e1a56 | 2224 | |
3da691bf ID |
2225 | /* |
2226 | * The response data for a STAT call consists of: | |
2227 | * le64 length; | |
2228 | * struct { | |
2229 | * le32 tv_sec; | |
2230 | * le32 tv_nsec; | |
2231 | * } mtime; | |
2232 | */ | |
2233 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
2234 | if (IS_ERR(pages)) | |
2235 | return PTR_ERR(pages); | |
2236 | ||
bcbab1db ID |
2237 | osd_req_op_init(osd_req, which, CEPH_OSD_OP_STAT, 0); |
2238 | osd_req_op_raw_data_in_pages(osd_req, which, pages, | |
3da691bf ID |
2239 | 8 + sizeof(struct ceph_timespec), |
2240 | 0, false, true); | |
2241 | return 0; | |
1217857f AE |
2242 | } |
2243 | ||
b5ae8cbc ID |
2244 | static int rbd_osd_setup_copyup(struct ceph_osd_request *osd_req, int which, |
2245 | u32 bytes) | |
2246 | { | |
2247 | struct rbd_obj_request *obj_req = osd_req->r_priv; | |
2248 | int ret; | |
2249 | ||
2250 | ret = osd_req_op_cls_init(osd_req, which, "rbd", "copyup"); | |
2251 | if (ret) | |
2252 | return ret; | |
2253 | ||
2254 | osd_req_op_cls_request_data_bvecs(osd_req, which, obj_req->copyup_bvecs, | |
2255 | obj_req->copyup_bvec_count, bytes); | |
2256 | return 0; | |
2257 | } | |
2258 | ||
ea9b743c ID |
2259 | static int rbd_obj_init_read(struct rbd_obj_request *obj_req) |
2260 | { | |
2261 | obj_req->read_state = RBD_OBJ_READ_START; | |
2262 | return 0; | |
2263 | } | |
2264 | ||
bcbab1db ID |
2265 | static void __rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
2266 | int which) | |
2169238d | 2267 | { |
bcbab1db | 2268 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
3da691bf ID |
2269 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
2270 | u16 opcode; | |
2169238d | 2271 | |
8b5bec5c ID |
2272 | if (!use_object_map(rbd_dev) || |
2273 | !(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) { | |
2274 | osd_req_op_alloc_hint_init(osd_req, which++, | |
2275 | rbd_dev->layout.object_size, | |
d3798acc | 2276 | rbd_dev->layout.object_size, |
dc1dad8e | 2277 | rbd_dev->opts->alloc_hint_flags); |
8b5bec5c | 2278 | } |
2169238d | 2279 | |
3da691bf ID |
2280 | if (rbd_obj_is_entire(obj_req)) |
2281 | opcode = CEPH_OSD_OP_WRITEFULL; | |
2282 | else | |
2283 | opcode = CEPH_OSD_OP_WRITE; | |
2169238d | 2284 | |
bcbab1db | 2285 | osd_req_op_extent_init(osd_req, which, opcode, |
43df3d35 | 2286 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
bcbab1db | 2287 | rbd_osd_setup_data(osd_req, which); |
3da691bf | 2288 | } |
2169238d | 2289 | |
ea9b743c | 2290 | static int rbd_obj_init_write(struct rbd_obj_request *obj_req) |
3da691bf | 2291 | { |
3da691bf ID |
2292 | int ret; |
2293 | ||
86bd7998 ID |
2294 | /* reverse map the entire object onto the parent */ |
2295 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
2296 | if (ret) | |
2297 | return ret; | |
2298 | ||
0ad5d953 ID |
2299 | if (rbd_obj_copyup_enabled(obj_req)) |
2300 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; | |
2301 | ||
85b5e6d1 | 2302 | obj_req->write_state = RBD_OBJ_WRITE_START; |
3da691bf | 2303 | return 0; |
2169238d AE |
2304 | } |
2305 | ||
6484cbe9 ID |
2306 | static u16 truncate_or_zero_opcode(struct rbd_obj_request *obj_req) |
2307 | { | |
2308 | return rbd_obj_is_tail(obj_req) ? CEPH_OSD_OP_TRUNCATE : | |
2309 | CEPH_OSD_OP_ZERO; | |
2310 | } | |
2311 | ||
27bbd911 ID |
2312 | static void __rbd_osd_setup_discard_ops(struct ceph_osd_request *osd_req, |
2313 | int which) | |
2314 | { | |
2315 | struct rbd_obj_request *obj_req = osd_req->r_priv; | |
2316 | ||
2317 | if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) { | |
2318 | rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); | |
2319 | osd_req_op_init(osd_req, which, CEPH_OSD_OP_DELETE, 0); | |
13488d53 | 2320 | } else { |
27bbd911 ID |
2321 | osd_req_op_extent_init(osd_req, which, |
2322 | truncate_or_zero_opcode(obj_req), | |
2323 | obj_req->ex.oe_off, obj_req->ex.oe_len, | |
2324 | 0, 0); | |
2325 | } | |
2326 | } | |
2327 | ||
ea9b743c | 2328 | static int rbd_obj_init_discard(struct rbd_obj_request *obj_req) |
6484cbe9 | 2329 | { |
0c93e1b7 | 2330 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
27bbd911 | 2331 | u64 off, next_off; |
6484cbe9 ID |
2332 | int ret; |
2333 | ||
0c93e1b7 ID |
2334 | /* |
2335 | * Align the range to alloc_size boundary and punt on discards | |
2336 | * that are too small to free up any space. | |
2337 | * | |
2338 | * alloc_size == object_size && is_tail() is a special case for | |
2339 | * filestore with filestore_punch_hole = false, needed to allow | |
2340 | * truncate (in addition to delete). | |
2341 | */ | |
2342 | if (rbd_dev->opts->alloc_size != rbd_dev->layout.object_size || | |
2343 | !rbd_obj_is_tail(obj_req)) { | |
27bbd911 ID |
2344 | off = round_up(obj_req->ex.oe_off, rbd_dev->opts->alloc_size); |
2345 | next_off = round_down(obj_req->ex.oe_off + obj_req->ex.oe_len, | |
2346 | rbd_dev->opts->alloc_size); | |
0c93e1b7 ID |
2347 | if (off >= next_off) |
2348 | return 1; | |
27bbd911 ID |
2349 | |
2350 | dout("%s %p %llu~%llu -> %llu~%llu\n", __func__, | |
2351 | obj_req, obj_req->ex.oe_off, obj_req->ex.oe_len, | |
2352 | off, next_off - off); | |
2353 | obj_req->ex.oe_off = off; | |
2354 | obj_req->ex.oe_len = next_off - off; | |
0c93e1b7 ID |
2355 | } |
2356 | ||
6484cbe9 ID |
2357 | /* reverse map the entire object onto the parent */ |
2358 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
2359 | if (ret) | |
2360 | return ret; | |
2361 | ||
22e8bd51 | 2362 | obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
0ad5d953 ID |
2363 | if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) |
2364 | obj_req->flags |= RBD_OBJ_FLAG_DELETION; | |
2365 | ||
85b5e6d1 | 2366 | obj_req->write_state = RBD_OBJ_WRITE_START; |
6484cbe9 ID |
2367 | return 0; |
2368 | } | |
2369 | ||
bcbab1db ID |
2370 | static void __rbd_osd_setup_zeroout_ops(struct ceph_osd_request *osd_req, |
2371 | int which) | |
3da691bf | 2372 | { |
bcbab1db | 2373 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
3b434a2a JD |
2374 | u16 opcode; |
2375 | ||
3da691bf | 2376 | if (rbd_obj_is_entire(obj_req)) { |
86bd7998 | 2377 | if (obj_req->num_img_extents) { |
0ad5d953 | 2378 | if (!(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) |
bcbab1db | 2379 | osd_req_op_init(osd_req, which++, |
9b17eb2c | 2380 | CEPH_OSD_OP_CREATE, 0); |
3b434a2a JD |
2381 | opcode = CEPH_OSD_OP_TRUNCATE; |
2382 | } else { | |
0ad5d953 | 2383 | rbd_assert(obj_req->flags & RBD_OBJ_FLAG_DELETION); |
bcbab1db | 2384 | osd_req_op_init(osd_req, which++, |
3da691bf ID |
2385 | CEPH_OSD_OP_DELETE, 0); |
2386 | opcode = 0; | |
3b434a2a | 2387 | } |
3b434a2a | 2388 | } else { |
6484cbe9 | 2389 | opcode = truncate_or_zero_opcode(obj_req); |
3b434a2a JD |
2390 | } |
2391 | ||
3da691bf | 2392 | if (opcode) |
bcbab1db | 2393 | osd_req_op_extent_init(osd_req, which, opcode, |
43df3d35 | 2394 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
3da691bf | 2395 | 0, 0); |
3b434a2a JD |
2396 | } |
2397 | ||
ea9b743c | 2398 | static int rbd_obj_init_zeroout(struct rbd_obj_request *obj_req) |
bf0d5f50 | 2399 | { |
3da691bf | 2400 | int ret; |
37206ee5 | 2401 | |
86bd7998 ID |
2402 | /* reverse map the entire object onto the parent */ |
2403 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
2404 | if (ret) | |
2405 | return ret; | |
f1a4739f | 2406 | |
0ad5d953 ID |
2407 | if (rbd_obj_copyup_enabled(obj_req)) |
2408 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ENABLED; | |
2409 | if (!obj_req->num_img_extents) { | |
22e8bd51 | 2410 | obj_req->flags |= RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT; |
0ad5d953 ID |
2411 | if (rbd_obj_is_entire(obj_req)) |
2412 | obj_req->flags |= RBD_OBJ_FLAG_DELETION; | |
3da691bf | 2413 | } |
3b434a2a | 2414 | |
a086a1b8 | 2415 | obj_req->write_state = RBD_OBJ_WRITE_START; |
3da691bf ID |
2416 | return 0; |
2417 | } | |
9d4df01f | 2418 | |
a086a1b8 ID |
2419 | static int count_write_ops(struct rbd_obj_request *obj_req) |
2420 | { | |
8b5bec5c ID |
2421 | struct rbd_img_request *img_req = obj_req->img_request; |
2422 | ||
2423 | switch (img_req->op_type) { | |
a086a1b8 | 2424 | case OBJ_OP_WRITE: |
8b5bec5c ID |
2425 | if (!use_object_map(img_req->rbd_dev) || |
2426 | !(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST)) | |
2427 | return 2; /* setallochint + write/writefull */ | |
2428 | ||
2429 | return 1; /* write/writefull */ | |
a086a1b8 ID |
2430 | case OBJ_OP_DISCARD: |
2431 | return 1; /* delete/truncate/zero */ | |
2432 | case OBJ_OP_ZEROOUT: | |
2433 | if (rbd_obj_is_entire(obj_req) && obj_req->num_img_extents && | |
2434 | !(obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED)) | |
2435 | return 2; /* create + truncate */ | |
bf0d5f50 | 2436 | |
a086a1b8 ID |
2437 | return 1; /* delete/truncate/zero */ |
2438 | default: | |
2439 | BUG(); | |
3da691bf | 2440 | } |
a086a1b8 | 2441 | } |
3b434a2a | 2442 | |
a086a1b8 ID |
2443 | static void rbd_osd_setup_write_ops(struct ceph_osd_request *osd_req, |
2444 | int which) | |
2445 | { | |
2446 | struct rbd_obj_request *obj_req = osd_req->r_priv; | |
2447 | ||
2448 | switch (obj_req->img_request->op_type) { | |
2449 | case OBJ_OP_WRITE: | |
2450 | __rbd_osd_setup_write_ops(osd_req, which); | |
2451 | break; | |
2452 | case OBJ_OP_DISCARD: | |
2453 | __rbd_osd_setup_discard_ops(osd_req, which); | |
2454 | break; | |
2455 | case OBJ_OP_ZEROOUT: | |
2456 | __rbd_osd_setup_zeroout_ops(osd_req, which); | |
2457 | break; | |
2458 | default: | |
2459 | BUG(); | |
2460 | } | |
3da691bf | 2461 | } |
9d4df01f | 2462 | |
3da691bf | 2463 | /* |
a086a1b8 ID |
2464 | * Prune the list of object requests (adjust offset and/or length, drop |
2465 | * redundant requests). Prepare object request state machines and image | |
2466 | * request state machine for execution. | |
3da691bf ID |
2467 | */ |
2468 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
2469 | { | |
0c93e1b7 | 2470 | struct rbd_obj_request *obj_req, *next_obj_req; |
3da691bf | 2471 | int ret; |
430c28c3 | 2472 | |
0c93e1b7 | 2473 | for_each_obj_request_safe(img_req, obj_req, next_obj_req) { |
9bb0248d | 2474 | switch (img_req->op_type) { |
3da691bf | 2475 | case OBJ_OP_READ: |
ea9b743c | 2476 | ret = rbd_obj_init_read(obj_req); |
3da691bf ID |
2477 | break; |
2478 | case OBJ_OP_WRITE: | |
ea9b743c | 2479 | ret = rbd_obj_init_write(obj_req); |
3da691bf ID |
2480 | break; |
2481 | case OBJ_OP_DISCARD: | |
ea9b743c | 2482 | ret = rbd_obj_init_discard(obj_req); |
3da691bf | 2483 | break; |
6484cbe9 | 2484 | case OBJ_OP_ZEROOUT: |
ea9b743c | 2485 | ret = rbd_obj_init_zeroout(obj_req); |
6484cbe9 | 2486 | break; |
3da691bf | 2487 | default: |
16809372 | 2488 | BUG(); |
3da691bf | 2489 | } |
0c93e1b7 | 2490 | if (ret < 0) |
3da691bf | 2491 | return ret; |
0c93e1b7 | 2492 | if (ret > 0) { |
0c93e1b7 ID |
2493 | rbd_img_obj_request_del(img_req, obj_req); |
2494 | continue; | |
2495 | } | |
bf0d5f50 AE |
2496 | } |
2497 | ||
0192ce2e | 2498 | img_req->state = RBD_IMG_START; |
bf0d5f50 | 2499 | return 0; |
3da691bf | 2500 | } |
bf0d5f50 | 2501 | |
5a237819 ID |
2502 | union rbd_img_fill_iter { |
2503 | struct ceph_bio_iter bio_iter; | |
2504 | struct ceph_bvec_iter bvec_iter; | |
2505 | }; | |
bf0d5f50 | 2506 | |
5a237819 ID |
2507 | struct rbd_img_fill_ctx { |
2508 | enum obj_request_type pos_type; | |
2509 | union rbd_img_fill_iter *pos; | |
2510 | union rbd_img_fill_iter iter; | |
2511 | ceph_object_extent_fn_t set_pos_fn; | |
afb97888 ID |
2512 | ceph_object_extent_fn_t count_fn; |
2513 | ceph_object_extent_fn_t copy_fn; | |
5a237819 | 2514 | }; |
bf0d5f50 | 2515 | |
5a237819 | 2516 | static struct ceph_object_extent *alloc_object_extent(void *arg) |
0eefd470 | 2517 | { |
5a237819 ID |
2518 | struct rbd_img_request *img_req = arg; |
2519 | struct rbd_obj_request *obj_req; | |
0eefd470 | 2520 | |
5a237819 ID |
2521 | obj_req = rbd_obj_request_create(); |
2522 | if (!obj_req) | |
2523 | return NULL; | |
2761713d | 2524 | |
5a237819 ID |
2525 | rbd_img_obj_request_add(img_req, obj_req); |
2526 | return &obj_req->ex; | |
2527 | } | |
0eefd470 | 2528 | |
afb97888 ID |
2529 | /* |
2530 | * While su != os && sc == 1 is technically not fancy (it's the same | |
2531 | * layout as su == os && sc == 1), we can't use the nocopy path for it | |
2532 | * because ->set_pos_fn() should be called only once per object. | |
2533 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so | |
2534 | * treat su != os && sc == 1 as fancy. | |
2535 | */ | |
2536 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) | |
2537 | { | |
2538 | return l->stripe_unit != l->object_size; | |
2539 | } | |
0eefd470 | 2540 | |
afb97888 ID |
2541 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
2542 | struct ceph_file_extent *img_extents, | |
2543 | u32 num_img_extents, | |
2544 | struct rbd_img_fill_ctx *fctx) | |
2545 | { | |
2546 | u32 i; | |
2547 | int ret; | |
2548 | ||
2549 | img_req->data_type = fctx->pos_type; | |
0eefd470 AE |
2550 | |
2551 | /* | |
afb97888 ID |
2552 | * Create object requests and set each object request's starting |
2553 | * position in the provided bio (list) or bio_vec array. | |
0eefd470 | 2554 | */ |
afb97888 ID |
2555 | fctx->iter = *fctx->pos; |
2556 | for (i = 0; i < num_img_extents; i++) { | |
2557 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, | |
2558 | img_extents[i].fe_off, | |
2559 | img_extents[i].fe_len, | |
2560 | &img_req->object_extents, | |
2561 | alloc_object_extent, img_req, | |
2562 | fctx->set_pos_fn, &fctx->iter); | |
2563 | if (ret) | |
2564 | return ret; | |
2565 | } | |
0eefd470 | 2566 | |
afb97888 | 2567 | return __rbd_img_fill_request(img_req); |
0eefd470 AE |
2568 | } |
2569 | ||
5a237819 ID |
2570 | /* |
2571 | * Map a list of image extents to a list of object extents, create the | |
2572 | * corresponding object requests (normally each to a different object, | |
2573 | * but not always) and add them to @img_req. For each object request, | |
afb97888 | 2574 | * set up its data descriptor to point to the corresponding chunk(s) of |
5a237819 ID |
2575 | * @fctx->pos data buffer. |
2576 | * | |
afb97888 ID |
2577 | * Because ceph_file_to_extents() will merge adjacent object extents |
2578 | * together, each object request's data descriptor may point to multiple | |
2579 | * different chunks of @fctx->pos data buffer. | |
2580 | * | |
5a237819 ID |
2581 | * @fctx->pos data buffer is assumed to be large enough. |
2582 | */ | |
2583 | static int rbd_img_fill_request(struct rbd_img_request *img_req, | |
2584 | struct ceph_file_extent *img_extents, | |
2585 | u32 num_img_extents, | |
2586 | struct rbd_img_fill_ctx *fctx) | |
3d7efd18 | 2587 | { |
afb97888 ID |
2588 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
2589 | struct rbd_obj_request *obj_req; | |
5a237819 ID |
2590 | u32 i; |
2591 | int ret; | |
2592 | ||
afb97888 ID |
2593 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
2594 | !rbd_layout_is_fancy(&rbd_dev->layout)) | |
2595 | return rbd_img_fill_request_nocopy(img_req, img_extents, | |
2596 | num_img_extents, fctx); | |
3d7efd18 | 2597 | |
afb97888 | 2598 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
0eefd470 | 2599 | |
bbea1c1a | 2600 | /* |
afb97888 ID |
2601 | * Create object requests and determine ->bvec_count for each object |
2602 | * request. Note that ->bvec_count sum over all object requests may | |
2603 | * be greater than the number of bio_vecs in the provided bio (list) | |
2604 | * or bio_vec array because when mapped, those bio_vecs can straddle | |
2605 | * stripe unit boundaries. | |
bbea1c1a | 2606 | */ |
5a237819 ID |
2607 | fctx->iter = *fctx->pos; |
2608 | for (i = 0; i < num_img_extents; i++) { | |
afb97888 | 2609 | ret = ceph_file_to_extents(&rbd_dev->layout, |
5a237819 ID |
2610 | img_extents[i].fe_off, |
2611 | img_extents[i].fe_len, | |
2612 | &img_req->object_extents, | |
2613 | alloc_object_extent, img_req, | |
afb97888 ID |
2614 | fctx->count_fn, &fctx->iter); |
2615 | if (ret) | |
2616 | return ret; | |
bbea1c1a | 2617 | } |
0eefd470 | 2618 | |
afb97888 ID |
2619 | for_each_obj_request(img_req, obj_req) { |
2620 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, | |
2621 | sizeof(*obj_req->bvec_pos.bvecs), | |
2622 | GFP_NOIO); | |
2623 | if (!obj_req->bvec_pos.bvecs) | |
2624 | return -ENOMEM; | |
2625 | } | |
0eefd470 | 2626 | |
8785b1d4 | 2627 | /* |
afb97888 ID |
2628 | * Fill in each object request's private bio_vec array, splitting and |
2629 | * rearranging the provided bio_vecs in stripe unit chunks as needed. | |
8785b1d4 | 2630 | */ |
afb97888 ID |
2631 | fctx->iter = *fctx->pos; |
2632 | for (i = 0; i < num_img_extents; i++) { | |
2633 | ret = ceph_iterate_extents(&rbd_dev->layout, | |
2634 | img_extents[i].fe_off, | |
2635 | img_extents[i].fe_len, | |
2636 | &img_req->object_extents, | |
2637 | fctx->copy_fn, &fctx->iter); | |
5a237819 ID |
2638 | if (ret) |
2639 | return ret; | |
2640 | } | |
3d7efd18 | 2641 | |
5a237819 ID |
2642 | return __rbd_img_fill_request(img_req); |
2643 | } | |
2644 | ||
2645 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, | |
2646 | u64 off, u64 len) | |
2647 | { | |
2648 | struct ceph_file_extent ex = { off, len }; | |
a55e601b | 2649 | union rbd_img_fill_iter dummy = {}; |
5a237819 ID |
2650 | struct rbd_img_fill_ctx fctx = { |
2651 | .pos_type = OBJ_REQUEST_NODATA, | |
2652 | .pos = &dummy, | |
2653 | }; | |
2654 | ||
2655 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); | |
2656 | } | |
2657 | ||
2658 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2659 | { | |
2660 | struct rbd_obj_request *obj_req = | |
2661 | container_of(ex, struct rbd_obj_request, ex); | |
2662 | struct ceph_bio_iter *it = arg; | |
3d7efd18 | 2663 | |
5a237819 ID |
2664 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2665 | obj_req->bio_pos = *it; | |
2666 | ceph_bio_iter_advance(it, bytes); | |
2667 | } | |
3d7efd18 | 2668 | |
afb97888 ID |
2669 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2670 | { | |
2671 | struct rbd_obj_request *obj_req = | |
2672 | container_of(ex, struct rbd_obj_request, ex); | |
2673 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2674 | |
afb97888 ID |
2675 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2676 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2677 | obj_req->bvec_count++; | |
2678 | })); | |
0eefd470 | 2679 | |
afb97888 | 2680 | } |
0eefd470 | 2681 | |
afb97888 ID |
2682 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2683 | { | |
2684 | struct rbd_obj_request *obj_req = | |
2685 | container_of(ex, struct rbd_obj_request, ex); | |
2686 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2687 | |
afb97888 ID |
2688 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2689 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2690 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2691 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2692 | })); | |
3d7efd18 AE |
2693 | } |
2694 | ||
5a237819 ID |
2695 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2696 | struct ceph_file_extent *img_extents, | |
2697 | u32 num_img_extents, | |
2698 | struct ceph_bio_iter *bio_pos) | |
2699 | { | |
2700 | struct rbd_img_fill_ctx fctx = { | |
2701 | .pos_type = OBJ_REQUEST_BIO, | |
2702 | .pos = (union rbd_img_fill_iter *)bio_pos, | |
2703 | .set_pos_fn = set_bio_pos, | |
afb97888 ID |
2704 | .count_fn = count_bio_bvecs, |
2705 | .copy_fn = copy_bio_bvecs, | |
5a237819 | 2706 | }; |
3d7efd18 | 2707 | |
5a237819 ID |
2708 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2709 | &fctx); | |
2710 | } | |
3d7efd18 | 2711 | |
5a237819 ID |
2712 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2713 | u64 off, u64 len, struct bio *bio) | |
2714 | { | |
2715 | struct ceph_file_extent ex = { off, len }; | |
2716 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; | |
3d7efd18 | 2717 | |
5a237819 ID |
2718 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
2719 | } | |
a9e8ba2c | 2720 | |
5a237819 ID |
2721 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2722 | { | |
2723 | struct rbd_obj_request *obj_req = | |
2724 | container_of(ex, struct rbd_obj_request, ex); | |
2725 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2726 | |
5a237819 ID |
2727 | obj_req->bvec_pos = *it; |
2728 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); | |
2729 | ceph_bvec_iter_advance(it, bytes); | |
2730 | } | |
3d7efd18 | 2731 | |
afb97888 ID |
2732 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2733 | { | |
2734 | struct rbd_obj_request *obj_req = | |
2735 | container_of(ex, struct rbd_obj_request, ex); | |
2736 | struct ceph_bvec_iter *it = arg; | |
058aa991 | 2737 | |
afb97888 ID |
2738 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2739 | obj_req->bvec_count++; | |
2740 | })); | |
2741 | } | |
058aa991 | 2742 | |
afb97888 ID |
2743 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2744 | { | |
2745 | struct rbd_obj_request *obj_req = | |
2746 | container_of(ex, struct rbd_obj_request, ex); | |
2747 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2748 | |
afb97888 ID |
2749 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2750 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2751 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2752 | })); | |
3d7efd18 AE |
2753 | } |
2754 | ||
5a237819 ID |
2755 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2756 | struct ceph_file_extent *img_extents, | |
2757 | u32 num_img_extents, | |
2758 | struct ceph_bvec_iter *bvec_pos) | |
c5b5ef6c | 2759 | { |
5a237819 ID |
2760 | struct rbd_img_fill_ctx fctx = { |
2761 | .pos_type = OBJ_REQUEST_BVECS, | |
2762 | .pos = (union rbd_img_fill_iter *)bvec_pos, | |
2763 | .set_pos_fn = set_bvec_pos, | |
afb97888 ID |
2764 | .count_fn = count_bvecs, |
2765 | .copy_fn = copy_bvecs, | |
5a237819 | 2766 | }; |
c5b5ef6c | 2767 | |
5a237819 ID |
2768 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2769 | &fctx); | |
2770 | } | |
c5b5ef6c | 2771 | |
5a237819 ID |
2772 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2773 | struct ceph_file_extent *img_extents, | |
2774 | u32 num_img_extents, | |
2775 | struct bio_vec *bvecs) | |
2776 | { | |
2777 | struct ceph_bvec_iter it = { | |
2778 | .bvecs = bvecs, | |
2779 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, | |
2780 | num_img_extents) }, | |
2781 | }; | |
c5b5ef6c | 2782 | |
5a237819 ID |
2783 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
2784 | &it); | |
2785 | } | |
c5b5ef6c | 2786 | |
0192ce2e | 2787 | static void rbd_img_handle_request_work(struct work_struct *work) |
bf0d5f50 | 2788 | { |
0192ce2e ID |
2789 | struct rbd_img_request *img_req = |
2790 | container_of(work, struct rbd_img_request, work); | |
c5b5ef6c | 2791 | |
0192ce2e ID |
2792 | rbd_img_handle_request(img_req, img_req->work_result); |
2793 | } | |
c2e82414 | 2794 | |
0192ce2e ID |
2795 | static void rbd_img_schedule(struct rbd_img_request *img_req, int result) |
2796 | { | |
2797 | INIT_WORK(&img_req->work, rbd_img_handle_request_work); | |
2798 | img_req->work_result = result; | |
2799 | queue_work(rbd_wq, &img_req->work); | |
c5b5ef6c | 2800 | } |
c2e82414 | 2801 | |
22e8bd51 ID |
2802 | static bool rbd_obj_may_exist(struct rbd_obj_request *obj_req) |
2803 | { | |
2804 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2805 | ||
2806 | if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) { | |
2807 | obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; | |
2808 | return true; | |
2809 | } | |
2810 | ||
2811 | dout("%s %p objno %llu assuming dne\n", __func__, obj_req, | |
2812 | obj_req->ex.oe_objno); | |
2813 | return false; | |
2814 | } | |
2815 | ||
85b5e6d1 ID |
2816 | static int rbd_obj_read_object(struct rbd_obj_request *obj_req) |
2817 | { | |
a086a1b8 ID |
2818 | struct ceph_osd_request *osd_req; |
2819 | int ret; | |
2820 | ||
2821 | osd_req = __rbd_obj_add_osd_request(obj_req, NULL, 1); | |
2822 | if (IS_ERR(osd_req)) | |
2823 | return PTR_ERR(osd_req); | |
2824 | ||
2825 | osd_req_op_extent_init(osd_req, 0, CEPH_OSD_OP_READ, | |
2826 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); | |
2827 | rbd_osd_setup_data(osd_req, 0); | |
2828 | rbd_osd_format_read(osd_req); | |
2829 | ||
2830 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); | |
2831 | if (ret) | |
2832 | return ret; | |
2833 | ||
2834 | rbd_osd_submit(osd_req); | |
85b5e6d1 | 2835 | return 0; |
c5b5ef6c AE |
2836 | } |
2837 | ||
86bd7998 | 2838 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
c5b5ef6c | 2839 | { |
3da691bf | 2840 | struct rbd_img_request *img_req = obj_req->img_request; |
a52cc685 | 2841 | struct rbd_device *parent = img_req->rbd_dev->parent; |
3da691bf | 2842 | struct rbd_img_request *child_img_req; |
c5b5ef6c AE |
2843 | int ret; |
2844 | ||
59e542c8 | 2845 | child_img_req = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
3da691bf | 2846 | if (!child_img_req) |
710214e3 ID |
2847 | return -ENOMEM; |
2848 | ||
59e542c8 | 2849 | rbd_img_request_init(child_img_req, parent, OBJ_OP_READ); |
e93aca0a ID |
2850 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
2851 | child_img_req->obj_request = obj_req; | |
a90bb0c1 | 2852 | |
a52cc685 ID |
2853 | down_read(&parent->header_rwsem); |
2854 | rbd_img_capture_header(child_img_req); | |
2855 | up_read(&parent->header_rwsem); | |
2856 | ||
21ed05a8 ID |
2857 | dout("%s child_img_req %p for obj_req %p\n", __func__, child_img_req, |
2858 | obj_req); | |
2859 | ||
3da691bf | 2860 | if (!rbd_img_is_write(img_req)) { |
ecc633ca | 2861 | switch (img_req->data_type) { |
3da691bf | 2862 | case OBJ_REQUEST_BIO: |
5a237819 ID |
2863 | ret = __rbd_img_fill_from_bio(child_img_req, |
2864 | obj_req->img_extents, | |
2865 | obj_req->num_img_extents, | |
2866 | &obj_req->bio_pos); | |
3da691bf ID |
2867 | break; |
2868 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2869 | case OBJ_REQUEST_OWN_BVECS: |
5a237819 ID |
2870 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
2871 | obj_req->img_extents, | |
2872 | obj_req->num_img_extents, | |
2873 | &obj_req->bvec_pos); | |
3da691bf ID |
2874 | break; |
2875 | default: | |
d342a15b | 2876 | BUG(); |
3da691bf ID |
2877 | } |
2878 | } else { | |
5a237819 ID |
2879 | ret = rbd_img_fill_from_bvecs(child_img_req, |
2880 | obj_req->img_extents, | |
2881 | obj_req->num_img_extents, | |
2882 | obj_req->copyup_bvecs); | |
3da691bf ID |
2883 | } |
2884 | if (ret) { | |
679a97d2 | 2885 | rbd_img_request_destroy(child_img_req); |
3da691bf ID |
2886 | return ret; |
2887 | } | |
2888 | ||
0192ce2e ID |
2889 | /* avoid parent chain recursion */ |
2890 | rbd_img_schedule(child_img_req, 0); | |
3da691bf ID |
2891 | return 0; |
2892 | } | |
2893 | ||
85b5e6d1 | 2894 | static bool rbd_obj_advance_read(struct rbd_obj_request *obj_req, int *result) |
3da691bf ID |
2895 | { |
2896 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2897 | int ret; | |
2898 | ||
22e8bd51 | 2899 | again: |
a9b67e69 | 2900 | switch (obj_req->read_state) { |
85b5e6d1 ID |
2901 | case RBD_OBJ_READ_START: |
2902 | rbd_assert(!*result); | |
2903 | ||
22e8bd51 ID |
2904 | if (!rbd_obj_may_exist(obj_req)) { |
2905 | *result = -ENOENT; | |
2906 | obj_req->read_state = RBD_OBJ_READ_OBJECT; | |
2907 | goto again; | |
2908 | } | |
2909 | ||
85b5e6d1 | 2910 | ret = rbd_obj_read_object(obj_req); |
3da691bf | 2911 | if (ret) { |
85b5e6d1 | 2912 | *result = ret; |
3da691bf ID |
2913 | return true; |
2914 | } | |
85b5e6d1 ID |
2915 | obj_req->read_state = RBD_OBJ_READ_OBJECT; |
2916 | return false; | |
a9b67e69 ID |
2917 | case RBD_OBJ_READ_OBJECT: |
2918 | if (*result == -ENOENT && rbd_dev->parent_overlap) { | |
2919 | /* reverse map this object extent onto the parent */ | |
2920 | ret = rbd_obj_calc_img_extents(obj_req, false); | |
86bd7998 | 2921 | if (ret) { |
54ab3b24 | 2922 | *result = ret; |
86bd7998 ID |
2923 | return true; |
2924 | } | |
a9b67e69 ID |
2925 | if (obj_req->num_img_extents) { |
2926 | ret = rbd_obj_read_from_parent(obj_req); | |
2927 | if (ret) { | |
2928 | *result = ret; | |
2929 | return true; | |
2930 | } | |
2931 | obj_req->read_state = RBD_OBJ_READ_PARENT; | |
2932 | return false; | |
2933 | } | |
86bd7998 | 2934 | } |
710214e3 | 2935 | |
a9b67e69 ID |
2936 | /* |
2937 | * -ENOENT means a hole in the image -- zero-fill the entire | |
2938 | * length of the request. A short read also implies zero-fill | |
2939 | * to the end of the request. | |
2940 | */ | |
2941 | if (*result == -ENOENT) { | |
2942 | rbd_obj_zero_range(obj_req, 0, obj_req->ex.oe_len); | |
2943 | *result = 0; | |
2944 | } else if (*result >= 0) { | |
2945 | if (*result < obj_req->ex.oe_len) | |
2946 | rbd_obj_zero_range(obj_req, *result, | |
2947 | obj_req->ex.oe_len - *result); | |
2948 | else | |
2949 | rbd_assert(*result == obj_req->ex.oe_len); | |
2950 | *result = 0; | |
2951 | } | |
2952 | return true; | |
2953 | case RBD_OBJ_READ_PARENT: | |
d435c9a7 ID |
2954 | /* |
2955 | * The parent image is read only up to the overlap -- zero-fill | |
2956 | * from the overlap to the end of the request. | |
2957 | */ | |
2958 | if (!*result) { | |
2959 | u32 obj_overlap = rbd_obj_img_extents_bytes(obj_req); | |
2960 | ||
2961 | if (obj_overlap < obj_req->ex.oe_len) | |
2962 | rbd_obj_zero_range(obj_req, obj_overlap, | |
2963 | obj_req->ex.oe_len - obj_overlap); | |
2964 | } | |
a9b67e69 ID |
2965 | return true; |
2966 | default: | |
2967 | BUG(); | |
710214e3 | 2968 | } |
3da691bf | 2969 | } |
c5b5ef6c | 2970 | |
22e8bd51 ID |
2971 | static bool rbd_obj_write_is_noop(struct rbd_obj_request *obj_req) |
2972 | { | |
2973 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2974 | ||
2975 | if (rbd_object_map_may_exist(rbd_dev, obj_req->ex.oe_objno)) | |
2976 | obj_req->flags |= RBD_OBJ_FLAG_MAY_EXIST; | |
2977 | ||
2978 | if (!(obj_req->flags & RBD_OBJ_FLAG_MAY_EXIST) && | |
2979 | (obj_req->flags & RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT)) { | |
2980 | dout("%s %p noop for nonexistent\n", __func__, obj_req); | |
2981 | return true; | |
2982 | } | |
2983 | ||
2984 | return false; | |
2985 | } | |
2986 | ||
2987 | /* | |
2988 | * Return: | |
2989 | * 0 - object map update sent | |
2990 | * 1 - object map update isn't needed | |
2991 | * <0 - error | |
2992 | */ | |
2993 | static int rbd_obj_write_pre_object_map(struct rbd_obj_request *obj_req) | |
2994 | { | |
2995 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2996 | u8 new_state; | |
2997 | ||
2998 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) | |
2999 | return 1; | |
3000 | ||
3001 | if (obj_req->flags & RBD_OBJ_FLAG_DELETION) | |
3002 | new_state = OBJECT_PENDING; | |
3003 | else | |
3004 | new_state = OBJECT_EXISTS; | |
3005 | ||
3006 | return rbd_object_map_update(obj_req, CEPH_NOSNAP, new_state, NULL); | |
3007 | } | |
3008 | ||
85b5e6d1 ID |
3009 | static int rbd_obj_write_object(struct rbd_obj_request *obj_req) |
3010 | { | |
a086a1b8 ID |
3011 | struct ceph_osd_request *osd_req; |
3012 | int num_ops = count_write_ops(obj_req); | |
3013 | int which = 0; | |
3014 | int ret; | |
710214e3 | 3015 | |
a086a1b8 ID |
3016 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) |
3017 | num_ops++; /* stat */ | |
3018 | ||
3019 | osd_req = rbd_obj_add_osd_request(obj_req, num_ops); | |
3020 | if (IS_ERR(osd_req)) | |
3021 | return PTR_ERR(osd_req); | |
3022 | ||
3023 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { | |
3024 | ret = rbd_osd_setup_stat(osd_req, which++); | |
3025 | if (ret) | |
3026 | return ret; | |
710214e3 | 3027 | } |
c5b5ef6c | 3028 | |
a086a1b8 ID |
3029 | rbd_osd_setup_write_ops(osd_req, which); |
3030 | rbd_osd_format_write(osd_req); | |
3031 | ||
3032 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); | |
3033 | if (ret) | |
3034 | return ret; | |
3035 | ||
3036 | rbd_osd_submit(osd_req); | |
85b5e6d1 | 3037 | return 0; |
3da691bf | 3038 | } |
c5b5ef6c | 3039 | |
3da691bf ID |
3040 | /* |
3041 | * copyup_bvecs pages are never highmem pages | |
3042 | */ | |
3043 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
3044 | { | |
3045 | struct ceph_bvec_iter it = { | |
3046 | .bvecs = bvecs, | |
3047 | .iter = { .bi_size = bytes }, | |
3048 | }; | |
c5b5ef6c | 3049 | |
3da691bf ID |
3050 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
3051 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
3052 | bv.bv_len)) | |
3053 | return false; | |
3054 | })); | |
3055 | return true; | |
c5b5ef6c AE |
3056 | } |
3057 | ||
3a482501 ID |
3058 | #define MODS_ONLY U32_MAX |
3059 | ||
793333a3 ID |
3060 | static int rbd_obj_copyup_empty_snapc(struct rbd_obj_request *obj_req, |
3061 | u32 bytes) | |
b454e36d | 3062 | { |
bcbab1db | 3063 | struct ceph_osd_request *osd_req; |
fe943d50 | 3064 | int ret; |
70d045f6 | 3065 | |
3da691bf | 3066 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
89a59c1c | 3067 | rbd_assert(bytes > 0 && bytes != MODS_ONLY); |
70d045f6 | 3068 | |
bcbab1db ID |
3069 | osd_req = __rbd_obj_add_osd_request(obj_req, &rbd_empty_snapc, 1); |
3070 | if (IS_ERR(osd_req)) | |
3071 | return PTR_ERR(osd_req); | |
b454e36d | 3072 | |
b5ae8cbc | 3073 | ret = rbd_osd_setup_copyup(osd_req, 0, bytes); |
fe943d50 CX |
3074 | if (ret) |
3075 | return ret; | |
3076 | ||
bcbab1db | 3077 | rbd_osd_format_write(osd_req); |
3da691bf | 3078 | |
bcbab1db | 3079 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
89a59c1c ID |
3080 | if (ret) |
3081 | return ret; | |
3082 | ||
a086a1b8 | 3083 | rbd_osd_submit(osd_req); |
89a59c1c ID |
3084 | return 0; |
3085 | } | |
3086 | ||
793333a3 ID |
3087 | static int rbd_obj_copyup_current_snapc(struct rbd_obj_request *obj_req, |
3088 | u32 bytes) | |
b454e36d | 3089 | { |
bcbab1db | 3090 | struct ceph_osd_request *osd_req; |
a086a1b8 ID |
3091 | int num_ops = count_write_ops(obj_req); |
3092 | int which = 0; | |
fe943d50 | 3093 | int ret; |
70d045f6 | 3094 | |
3da691bf | 3095 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
70d045f6 | 3096 | |
a086a1b8 ID |
3097 | if (bytes != MODS_ONLY) |
3098 | num_ops++; /* copyup */ | |
13488d53 | 3099 | |
a086a1b8 | 3100 | osd_req = rbd_obj_add_osd_request(obj_req, num_ops); |
bcbab1db ID |
3101 | if (IS_ERR(osd_req)) |
3102 | return PTR_ERR(osd_req); | |
b454e36d | 3103 | |
3a482501 | 3104 | if (bytes != MODS_ONLY) { |
b5ae8cbc | 3105 | ret = rbd_osd_setup_copyup(osd_req, which++, bytes); |
3a482501 ID |
3106 | if (ret) |
3107 | return ret; | |
3da691bf | 3108 | } |
3da691bf | 3109 | |
a086a1b8 ID |
3110 | rbd_osd_setup_write_ops(osd_req, which); |
3111 | rbd_osd_format_write(osd_req); | |
70d045f6 | 3112 | |
bcbab1db | 3113 | ret = ceph_osdc_alloc_messages(osd_req, GFP_NOIO); |
26f887e0 ID |
3114 | if (ret) |
3115 | return ret; | |
3116 | ||
a086a1b8 | 3117 | rbd_osd_submit(osd_req); |
3da691bf | 3118 | return 0; |
70d045f6 ID |
3119 | } |
3120 | ||
7e07efb1 | 3121 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
70d045f6 | 3122 | { |
7e07efb1 | 3123 | u32 i; |
b454e36d | 3124 | |
7e07efb1 ID |
3125 | rbd_assert(!obj_req->copyup_bvecs); |
3126 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
3127 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
3128 | sizeof(*obj_req->copyup_bvecs), | |
3129 | GFP_NOIO); | |
3130 | if (!obj_req->copyup_bvecs) | |
3131 | return -ENOMEM; | |
b454e36d | 3132 | |
7e07efb1 ID |
3133 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
3134 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
3135 | ||
3136 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
3137 | if (!obj_req->copyup_bvecs[i].bv_page) | |
3138 | return -ENOMEM; | |
3d7efd18 | 3139 | |
7e07efb1 ID |
3140 | obj_req->copyup_bvecs[i].bv_offset = 0; |
3141 | obj_req->copyup_bvecs[i].bv_len = len; | |
3142 | obj_overlap -= len; | |
3143 | } | |
b454e36d | 3144 | |
7e07efb1 ID |
3145 | rbd_assert(!obj_overlap); |
3146 | return 0; | |
b454e36d AE |
3147 | } |
3148 | ||
0ad5d953 ID |
3149 | /* |
3150 | * The target object doesn't exist. Read the data for the entire | |
3151 | * target object up to the overlap point (if any) from the parent, | |
3152 | * so we can use it for a copyup. | |
3153 | */ | |
793333a3 | 3154 | static int rbd_obj_copyup_read_parent(struct rbd_obj_request *obj_req) |
bf0d5f50 | 3155 | { |
3da691bf | 3156 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
3da691bf | 3157 | int ret; |
bf0d5f50 | 3158 | |
86bd7998 ID |
3159 | rbd_assert(obj_req->num_img_extents); |
3160 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
3161 | rbd_dev->parent_overlap); | |
3162 | if (!obj_req->num_img_extents) { | |
3da691bf ID |
3163 | /* |
3164 | * The overlap has become 0 (most likely because the | |
3a482501 ID |
3165 | * image has been flattened). Re-submit the original write |
3166 | * request -- pass MODS_ONLY since the copyup isn't needed | |
3167 | * anymore. | |
3da691bf | 3168 | */ |
793333a3 | 3169 | return rbd_obj_copyup_current_snapc(obj_req, MODS_ONLY); |
bf0d5f50 AE |
3170 | } |
3171 | ||
86bd7998 | 3172 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
3da691bf ID |
3173 | if (ret) |
3174 | return ret; | |
3175 | ||
86bd7998 | 3176 | return rbd_obj_read_from_parent(obj_req); |
bf0d5f50 | 3177 | } |
8b3e1a56 | 3178 | |
22e8bd51 ID |
3179 | static void rbd_obj_copyup_object_maps(struct rbd_obj_request *obj_req) |
3180 | { | |
3181 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
3182 | struct ceph_snap_context *snapc = obj_req->img_request->snapc; | |
3183 | u8 new_state; | |
3184 | u32 i; | |
3185 | int ret; | |
3186 | ||
3187 | rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); | |
3188 | ||
3189 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) | |
3190 | return; | |
3191 | ||
3192 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) | |
3193 | return; | |
3194 | ||
3195 | for (i = 0; i < snapc->num_snaps; i++) { | |
3196 | if ((rbd_dev->header.features & RBD_FEATURE_FAST_DIFF) && | |
3197 | i + 1 < snapc->num_snaps) | |
3198 | new_state = OBJECT_EXISTS_CLEAN; | |
3199 | else | |
3200 | new_state = OBJECT_EXISTS; | |
3201 | ||
3202 | ret = rbd_object_map_update(obj_req, snapc->snaps[i], | |
3203 | new_state, NULL); | |
3204 | if (ret < 0) { | |
3205 | obj_req->pending.result = ret; | |
3206 | return; | |
3207 | } | |
3208 | ||
3209 | rbd_assert(!ret); | |
3210 | obj_req->pending.num_pending++; | |
3211 | } | |
3212 | } | |
3213 | ||
793333a3 ID |
3214 | static void rbd_obj_copyup_write_object(struct rbd_obj_request *obj_req) |
3215 | { | |
3216 | u32 bytes = rbd_obj_img_extents_bytes(obj_req); | |
3217 | int ret; | |
3218 | ||
3219 | rbd_assert(!obj_req->pending.result && !obj_req->pending.num_pending); | |
3220 | ||
3221 | /* | |
3222 | * Only send non-zero copyup data to save some I/O and network | |
3223 | * bandwidth -- zero copyup data is equivalent to the object not | |
3224 | * existing. | |
3225 | */ | |
3226 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ZEROS) | |
3227 | bytes = 0; | |
3228 | ||
3229 | if (obj_req->img_request->snapc->num_snaps && bytes > 0) { | |
3230 | /* | |
3231 | * Send a copyup request with an empty snapshot context to | |
3232 | * deep-copyup the object through all existing snapshots. | |
3233 | * A second request with the current snapshot context will be | |
3234 | * sent for the actual modification. | |
3235 | */ | |
3236 | ret = rbd_obj_copyup_empty_snapc(obj_req, bytes); | |
3237 | if (ret) { | |
3238 | obj_req->pending.result = ret; | |
3239 | return; | |
3240 | } | |
3241 | ||
3242 | obj_req->pending.num_pending++; | |
3243 | bytes = MODS_ONLY; | |
3244 | } | |
3245 | ||
3246 | ret = rbd_obj_copyup_current_snapc(obj_req, bytes); | |
3247 | if (ret) { | |
3248 | obj_req->pending.result = ret; | |
3249 | return; | |
3250 | } | |
3251 | ||
3252 | obj_req->pending.num_pending++; | |
3253 | } | |
3254 | ||
3255 | static bool rbd_obj_advance_copyup(struct rbd_obj_request *obj_req, int *result) | |
3256 | { | |
22e8bd51 | 3257 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
793333a3 ID |
3258 | int ret; |
3259 | ||
3260 | again: | |
3261 | switch (obj_req->copyup_state) { | |
3262 | case RBD_OBJ_COPYUP_START: | |
3263 | rbd_assert(!*result); | |
3264 | ||
3265 | ret = rbd_obj_copyup_read_parent(obj_req); | |
3266 | if (ret) { | |
3267 | *result = ret; | |
3268 | return true; | |
3269 | } | |
3270 | if (obj_req->num_img_extents) | |
3271 | obj_req->copyup_state = RBD_OBJ_COPYUP_READ_PARENT; | |
3272 | else | |
3273 | obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; | |
3274 | return false; | |
3275 | case RBD_OBJ_COPYUP_READ_PARENT: | |
3276 | if (*result) | |
3277 | return true; | |
3278 | ||
3279 | if (is_zero_bvecs(obj_req->copyup_bvecs, | |
3280 | rbd_obj_img_extents_bytes(obj_req))) { | |
3281 | dout("%s %p detected zeros\n", __func__, obj_req); | |
3282 | obj_req->flags |= RBD_OBJ_FLAG_COPYUP_ZEROS; | |
3283 | } | |
3284 | ||
22e8bd51 ID |
3285 | rbd_obj_copyup_object_maps(obj_req); |
3286 | if (!obj_req->pending.num_pending) { | |
3287 | *result = obj_req->pending.result; | |
3288 | obj_req->copyup_state = RBD_OBJ_COPYUP_OBJECT_MAPS; | |
3289 | goto again; | |
3290 | } | |
3291 | obj_req->copyup_state = __RBD_OBJ_COPYUP_OBJECT_MAPS; | |
3292 | return false; | |
3293 | case __RBD_OBJ_COPYUP_OBJECT_MAPS: | |
3294 | if (!pending_result_dec(&obj_req->pending, result)) | |
3295 | return false; | |
df561f66 | 3296 | fallthrough; |
22e8bd51 ID |
3297 | case RBD_OBJ_COPYUP_OBJECT_MAPS: |
3298 | if (*result) { | |
3299 | rbd_warn(rbd_dev, "snap object map update failed: %d", | |
3300 | *result); | |
3301 | return true; | |
3302 | } | |
3303 | ||
793333a3 ID |
3304 | rbd_obj_copyup_write_object(obj_req); |
3305 | if (!obj_req->pending.num_pending) { | |
3306 | *result = obj_req->pending.result; | |
3307 | obj_req->copyup_state = RBD_OBJ_COPYUP_WRITE_OBJECT; | |
3308 | goto again; | |
3309 | } | |
3310 | obj_req->copyup_state = __RBD_OBJ_COPYUP_WRITE_OBJECT; | |
3311 | return false; | |
3312 | case __RBD_OBJ_COPYUP_WRITE_OBJECT: | |
3313 | if (!pending_result_dec(&obj_req->pending, result)) | |
3314 | return false; | |
df561f66 | 3315 | fallthrough; |
793333a3 ID |
3316 | case RBD_OBJ_COPYUP_WRITE_OBJECT: |
3317 | return true; | |
3318 | default: | |
3319 | BUG(); | |
3320 | } | |
3321 | } | |
3322 | ||
22e8bd51 ID |
3323 | /* |
3324 | * Return: | |
3325 | * 0 - object map update sent | |
3326 | * 1 - object map update isn't needed | |
3327 | * <0 - error | |
3328 | */ | |
3329 | static int rbd_obj_write_post_object_map(struct rbd_obj_request *obj_req) | |
3330 | { | |
3331 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
3332 | u8 current_state = OBJECT_PENDING; | |
3333 | ||
3334 | if (!(rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) | |
3335 | return 1; | |
3336 | ||
3337 | if (!(obj_req->flags & RBD_OBJ_FLAG_DELETION)) | |
3338 | return 1; | |
3339 | ||
3340 | return rbd_object_map_update(obj_req, CEPH_NOSNAP, OBJECT_NONEXISTENT, | |
3341 | ¤t_state); | |
3342 | } | |
3343 | ||
85b5e6d1 | 3344 | static bool rbd_obj_advance_write(struct rbd_obj_request *obj_req, int *result) |
8b3e1a56 | 3345 | { |
793333a3 | 3346 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
3da691bf | 3347 | int ret; |
8b3e1a56 | 3348 | |
793333a3 | 3349 | again: |
3da691bf | 3350 | switch (obj_req->write_state) { |
85b5e6d1 ID |
3351 | case RBD_OBJ_WRITE_START: |
3352 | rbd_assert(!*result); | |
3353 | ||
22e8bd51 ID |
3354 | if (rbd_obj_write_is_noop(obj_req)) |
3355 | return true; | |
3356 | ||
3357 | ret = rbd_obj_write_pre_object_map(obj_req); | |
3358 | if (ret < 0) { | |
3359 | *result = ret; | |
3360 | return true; | |
3361 | } | |
3362 | obj_req->write_state = RBD_OBJ_WRITE_PRE_OBJECT_MAP; | |
3363 | if (ret > 0) | |
3364 | goto again; | |
3365 | return false; | |
3366 | case RBD_OBJ_WRITE_PRE_OBJECT_MAP: | |
3367 | if (*result) { | |
3368 | rbd_warn(rbd_dev, "pre object map update failed: %d", | |
3369 | *result); | |
3370 | return true; | |
3371 | } | |
85b5e6d1 ID |
3372 | ret = rbd_obj_write_object(obj_req); |
3373 | if (ret) { | |
3374 | *result = ret; | |
3375 | return true; | |
3376 | } | |
3377 | obj_req->write_state = RBD_OBJ_WRITE_OBJECT; | |
3378 | return false; | |
0ad5d953 | 3379 | case RBD_OBJ_WRITE_OBJECT: |
54ab3b24 | 3380 | if (*result == -ENOENT) { |
0ad5d953 | 3381 | if (obj_req->flags & RBD_OBJ_FLAG_COPYUP_ENABLED) { |
793333a3 ID |
3382 | *result = 0; |
3383 | obj_req->copyup_state = RBD_OBJ_COPYUP_START; | |
3384 | obj_req->write_state = __RBD_OBJ_WRITE_COPYUP; | |
3385 | goto again; | |
0ad5d953 | 3386 | } |
3da691bf | 3387 | /* |
0ad5d953 ID |
3388 | * On a non-existent object: |
3389 | * delete - -ENOENT, truncate/zero - 0 | |
3da691bf | 3390 | */ |
0ad5d953 ID |
3391 | if (obj_req->flags & RBD_OBJ_FLAG_DELETION) |
3392 | *result = 0; | |
3da691bf | 3393 | } |
a9b67e69 | 3394 | if (*result) |
3a482501 | 3395 | return true; |
8b3e1a56 | 3396 | |
793333a3 ID |
3397 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; |
3398 | goto again; | |
3399 | case __RBD_OBJ_WRITE_COPYUP: | |
3400 | if (!rbd_obj_advance_copyup(obj_req, result)) | |
3401 | return false; | |
df561f66 | 3402 | fallthrough; |
793333a3 | 3403 | case RBD_OBJ_WRITE_COPYUP: |
22e8bd51 | 3404 | if (*result) { |
793333a3 | 3405 | rbd_warn(rbd_dev, "copyup failed: %d", *result); |
22e8bd51 ID |
3406 | return true; |
3407 | } | |
3408 | ret = rbd_obj_write_post_object_map(obj_req); | |
3409 | if (ret < 0) { | |
3410 | *result = ret; | |
3411 | return true; | |
3412 | } | |
3413 | obj_req->write_state = RBD_OBJ_WRITE_POST_OBJECT_MAP; | |
3414 | if (ret > 0) | |
3415 | goto again; | |
3416 | return false; | |
3417 | case RBD_OBJ_WRITE_POST_OBJECT_MAP: | |
3418 | if (*result) | |
3419 | rbd_warn(rbd_dev, "post object map update failed: %d", | |
3420 | *result); | |
793333a3 | 3421 | return true; |
3da691bf | 3422 | default: |
c6244b3b | 3423 | BUG(); |
3da691bf ID |
3424 | } |
3425 | } | |
02c74fba | 3426 | |
3da691bf | 3427 | /* |
0ad5d953 | 3428 | * Return true if @obj_req is completed. |
3da691bf | 3429 | */ |
54ab3b24 ID |
3430 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req, |
3431 | int *result) | |
3da691bf | 3432 | { |
0ad5d953 | 3433 | struct rbd_img_request *img_req = obj_req->img_request; |
0192ce2e | 3434 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
0ad5d953 ID |
3435 | bool done; |
3436 | ||
85b5e6d1 | 3437 | mutex_lock(&obj_req->state_mutex); |
0ad5d953 | 3438 | if (!rbd_img_is_write(img_req)) |
85b5e6d1 | 3439 | done = rbd_obj_advance_read(obj_req, result); |
0ad5d953 | 3440 | else |
85b5e6d1 ID |
3441 | done = rbd_obj_advance_write(obj_req, result); |
3442 | mutex_unlock(&obj_req->state_mutex); | |
0ad5d953 | 3443 | |
0192ce2e ID |
3444 | if (done && *result) { |
3445 | rbd_assert(*result < 0); | |
3446 | rbd_warn(rbd_dev, "%s at objno %llu %llu~%llu result %d", | |
3447 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, | |
3448 | obj_req->ex.oe_off, obj_req->ex.oe_len, *result); | |
3449 | } | |
0ad5d953 | 3450 | return done; |
3da691bf | 3451 | } |
02c74fba | 3452 | |
0192ce2e ID |
3453 | /* |
3454 | * This is open-coded in rbd_img_handle_request() to avoid parent chain | |
3455 | * recursion. | |
3456 | */ | |
3457 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req, int result) | |
3458 | { | |
3459 | if (__rbd_obj_handle_request(obj_req, &result)) | |
3460 | rbd_img_handle_request(obj_req->img_request, result); | |
3461 | } | |
3462 | ||
e1fddc8f ID |
3463 | static bool need_exclusive_lock(struct rbd_img_request *img_req) |
3464 | { | |
3465 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
3466 | ||
3467 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) | |
3468 | return false; | |
3469 | ||
3fe69921 | 3470 | if (rbd_is_ro(rbd_dev)) |
e1fddc8f ID |
3471 | return false; |
3472 | ||
3473 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); | |
22e8bd51 ID |
3474 | if (rbd_dev->opts->lock_on_read || |
3475 | (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) | |
e1fddc8f ID |
3476 | return true; |
3477 | ||
3478 | return rbd_img_is_write(img_req); | |
3479 | } | |
3480 | ||
637cd060 | 3481 | static bool rbd_lock_add_request(struct rbd_img_request *img_req) |
e1fddc8f ID |
3482 | { |
3483 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
637cd060 | 3484 | bool locked; |
e1fddc8f ID |
3485 | |
3486 | lockdep_assert_held(&rbd_dev->lock_rwsem); | |
637cd060 | 3487 | locked = rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED; |
e1fddc8f ID |
3488 | spin_lock(&rbd_dev->lock_lists_lock); |
3489 | rbd_assert(list_empty(&img_req->lock_item)); | |
637cd060 ID |
3490 | if (!locked) |
3491 | list_add_tail(&img_req->lock_item, &rbd_dev->acquiring_list); | |
3492 | else | |
3493 | list_add_tail(&img_req->lock_item, &rbd_dev->running_list); | |
e1fddc8f | 3494 | spin_unlock(&rbd_dev->lock_lists_lock); |
637cd060 | 3495 | return locked; |
e1fddc8f ID |
3496 | } |
3497 | ||
3498 | static void rbd_lock_del_request(struct rbd_img_request *img_req) | |
3499 | { | |
3500 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
3501 | bool need_wakeup; | |
3502 | ||
3503 | lockdep_assert_held(&rbd_dev->lock_rwsem); | |
3504 | spin_lock(&rbd_dev->lock_lists_lock); | |
3505 | rbd_assert(!list_empty(&img_req->lock_item)); | |
3506 | list_del_init(&img_req->lock_item); | |
3507 | need_wakeup = (rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING && | |
3508 | list_empty(&rbd_dev->running_list)); | |
3509 | spin_unlock(&rbd_dev->lock_lists_lock); | |
3510 | if (need_wakeup) | |
3511 | complete(&rbd_dev->releasing_wait); | |
3512 | } | |
3513 | ||
637cd060 ID |
3514 | static int rbd_img_exclusive_lock(struct rbd_img_request *img_req) |
3515 | { | |
3516 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
3517 | ||
3518 | if (!need_exclusive_lock(img_req)) | |
3519 | return 1; | |
3520 | ||
3521 | if (rbd_lock_add_request(img_req)) | |
3522 | return 1; | |
3523 | ||
3524 | if (rbd_dev->opts->exclusive) { | |
3525 | WARN_ON(1); /* lock got released? */ | |
3526 | return -EROFS; | |
3527 | } | |
3528 | ||
3529 | /* | |
3530 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3531 | * and cancel_delayed_work() in wake_lock_waiters(). | |
3532 | */ | |
3533 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3534 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3535 | return 0; | |
3536 | } | |
3537 | ||
0192ce2e | 3538 | static void rbd_img_object_requests(struct rbd_img_request *img_req) |
7114edac | 3539 | { |
0192ce2e | 3540 | struct rbd_obj_request *obj_req; |
7114edac | 3541 | |
0192ce2e ID |
3542 | rbd_assert(!img_req->pending.result && !img_req->pending.num_pending); |
3543 | ||
3544 | for_each_obj_request(img_req, obj_req) { | |
3545 | int result = 0; | |
a9e8ba2c | 3546 | |
0192ce2e ID |
3547 | if (__rbd_obj_handle_request(obj_req, &result)) { |
3548 | if (result) { | |
3549 | img_req->pending.result = result; | |
3550 | return; | |
3551 | } | |
3552 | } else { | |
3553 | img_req->pending.num_pending++; | |
3554 | } | |
3555 | } | |
8b3e1a56 AE |
3556 | } |
3557 | ||
0192ce2e | 3558 | static bool rbd_img_advance(struct rbd_img_request *img_req, int *result) |
8b3e1a56 | 3559 | { |
637cd060 | 3560 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
3da691bf | 3561 | int ret; |
8b3e1a56 | 3562 | |
0192ce2e ID |
3563 | again: |
3564 | switch (img_req->state) { | |
3565 | case RBD_IMG_START: | |
3566 | rbd_assert(!*result); | |
8b3e1a56 | 3567 | |
637cd060 ID |
3568 | ret = rbd_img_exclusive_lock(img_req); |
3569 | if (ret < 0) { | |
3570 | *result = ret; | |
3da691bf ID |
3571 | return true; |
3572 | } | |
637cd060 ID |
3573 | img_req->state = RBD_IMG_EXCLUSIVE_LOCK; |
3574 | if (ret > 0) | |
3575 | goto again; | |
3da691bf | 3576 | return false; |
637cd060 ID |
3577 | case RBD_IMG_EXCLUSIVE_LOCK: |
3578 | if (*result) | |
89a59c1c ID |
3579 | return true; |
3580 | ||
637cd060 ID |
3581 | rbd_assert(!need_exclusive_lock(img_req) || |
3582 | __rbd_is_lock_owner(rbd_dev)); | |
3583 | ||
0192ce2e ID |
3584 | rbd_img_object_requests(img_req); |
3585 | if (!img_req->pending.num_pending) { | |
3586 | *result = img_req->pending.result; | |
3587 | img_req->state = RBD_IMG_OBJECT_REQUESTS; | |
3588 | goto again; | |
3da691bf | 3589 | } |
0192ce2e | 3590 | img_req->state = __RBD_IMG_OBJECT_REQUESTS; |
3da691bf | 3591 | return false; |
0192ce2e ID |
3592 | case __RBD_IMG_OBJECT_REQUESTS: |
3593 | if (!pending_result_dec(&img_req->pending, result)) | |
3594 | return false; | |
df561f66 | 3595 | fallthrough; |
0192ce2e ID |
3596 | case RBD_IMG_OBJECT_REQUESTS: |
3597 | return true; | |
3da691bf | 3598 | default: |
c6244b3b | 3599 | BUG(); |
3da691bf ID |
3600 | } |
3601 | } | |
02c74fba | 3602 | |
3da691bf | 3603 | /* |
0192ce2e | 3604 | * Return true if @img_req is completed. |
3da691bf | 3605 | */ |
0192ce2e ID |
3606 | static bool __rbd_img_handle_request(struct rbd_img_request *img_req, |
3607 | int *result) | |
7114edac | 3608 | { |
0192ce2e ID |
3609 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
3610 | bool done; | |
7114edac | 3611 | |
e1fddc8f ID |
3612 | if (need_exclusive_lock(img_req)) { |
3613 | down_read(&rbd_dev->lock_rwsem); | |
3614 | mutex_lock(&img_req->state_mutex); | |
3615 | done = rbd_img_advance(img_req, result); | |
3616 | if (done) | |
3617 | rbd_lock_del_request(img_req); | |
3618 | mutex_unlock(&img_req->state_mutex); | |
3619 | up_read(&rbd_dev->lock_rwsem); | |
3620 | } else { | |
3621 | mutex_lock(&img_req->state_mutex); | |
3622 | done = rbd_img_advance(img_req, result); | |
3623 | mutex_unlock(&img_req->state_mutex); | |
02c74fba | 3624 | } |
a9e8ba2c | 3625 | |
0192ce2e ID |
3626 | if (done && *result) { |
3627 | rbd_assert(*result < 0); | |
3628 | rbd_warn(rbd_dev, "%s%s result %d", | |
3629 | test_bit(IMG_REQ_CHILD, &img_req->flags) ? "child " : "", | |
3630 | obj_op_name(img_req->op_type), *result); | |
7114edac | 3631 | } |
0192ce2e | 3632 | return done; |
7114edac | 3633 | } |
a9e8ba2c | 3634 | |
0192ce2e | 3635 | static void rbd_img_handle_request(struct rbd_img_request *img_req, int result) |
3da691bf | 3636 | { |
7114edac | 3637 | again: |
0192ce2e | 3638 | if (!__rbd_img_handle_request(img_req, &result)) |
7114edac | 3639 | return; |
8b3e1a56 | 3640 | |
7114edac | 3641 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { |
0192ce2e ID |
3642 | struct rbd_obj_request *obj_req = img_req->obj_request; |
3643 | ||
679a97d2 | 3644 | rbd_img_request_destroy(img_req); |
0192ce2e ID |
3645 | if (__rbd_obj_handle_request(obj_req, &result)) { |
3646 | img_req = obj_req->img_request; | |
3647 | goto again; | |
3648 | } | |
3649 | } else { | |
59e542c8 | 3650 | struct request *rq = blk_mq_rq_from_pdu(img_req); |
0192ce2e | 3651 | |
679a97d2 | 3652 | rbd_img_request_destroy(img_req); |
0192ce2e | 3653 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
7114edac | 3654 | } |
8b3e1a56 | 3655 | } |
bf0d5f50 | 3656 | |
ed95b21a | 3657 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 3658 | |
ed95b21a ID |
3659 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
3660 | const struct rbd_client_id *rhs) | |
3661 | { | |
3662 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
3663 | } | |
3664 | ||
3665 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
3666 | { | |
3667 | struct rbd_client_id cid; | |
3668 | ||
3669 | mutex_lock(&rbd_dev->watch_mutex); | |
3670 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
3671 | cid.handle = rbd_dev->watch_cookie; | |
3672 | mutex_unlock(&rbd_dev->watch_mutex); | |
3673 | return cid; | |
3674 | } | |
3675 | ||
3676 | /* | |
3677 | * lock_rwsem must be held for write | |
3678 | */ | |
3679 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
3680 | const struct rbd_client_id *cid) | |
3681 | { | |
3682 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
3683 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
3684 | cid->gid, cid->handle); | |
3685 | rbd_dev->owner_cid = *cid; /* struct */ | |
3686 | } | |
3687 | ||
3688 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
3689 | { | |
3690 | mutex_lock(&rbd_dev->watch_mutex); | |
3691 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
3692 | mutex_unlock(&rbd_dev->watch_mutex); | |
3693 | } | |
3694 | ||
edd8ca80 FM |
3695 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
3696 | { | |
3697 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
3698 | ||
a2b1da09 | 3699 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 FM |
3700 | strcpy(rbd_dev->lock_cookie, cookie); |
3701 | rbd_set_owner_cid(rbd_dev, &cid); | |
3702 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
3703 | } | |
3704 | ||
ed95b21a ID |
3705 | /* |
3706 | * lock_rwsem must be held for write | |
3707 | */ | |
3708 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 3709 | { |
922dab61 | 3710 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 3711 | char cookie[32]; |
e627db08 | 3712 | int ret; |
b8d70035 | 3713 | |
cbbfb0ff ID |
3714 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
3715 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 3716 | |
ed95b21a ID |
3717 | format_lock_cookie(rbd_dev, cookie); |
3718 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
3719 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
3720 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 3721 | if (ret) |
ed95b21a | 3722 | return ret; |
b8d70035 | 3723 | |
edd8ca80 | 3724 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 3725 | return 0; |
b8d70035 AE |
3726 | } |
3727 | ||
ed95b21a ID |
3728 | /* |
3729 | * lock_rwsem must be held for write | |
3730 | */ | |
bbead745 | 3731 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 3732 | { |
922dab61 | 3733 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
3734 | int ret; |
3735 | ||
cbbfb0ff ID |
3736 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
3737 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 3738 | |
ed95b21a | 3739 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 3740 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 | 3741 | if (ret && ret != -ENOENT) |
637cd060 | 3742 | rbd_warn(rbd_dev, "failed to unlock header: %d", ret); |
bb040aa0 | 3743 | |
bbead745 ID |
3744 | /* treat errors as the image is unlocked */ |
3745 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 3746 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
3747 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
3748 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
3749 | } |
3750 | ||
ed95b21a ID |
3751 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
3752 | enum rbd_notify_op notify_op, | |
3753 | struct page ***preply_pages, | |
3754 | size_t *preply_len) | |
9969ebc5 AE |
3755 | { |
3756 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a | 3757 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
08a79102 KS |
3758 | char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
3759 | int buf_size = sizeof(buf); | |
ed95b21a | 3760 | void *p = buf; |
9969ebc5 | 3761 | |
ed95b21a | 3762 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 3763 | |
ed95b21a ID |
3764 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
3765 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3766 | ceph_encode_32(&p, notify_op); | |
3767 | ceph_encode_64(&p, cid.gid); | |
3768 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 3769 | |
ed95b21a ID |
3770 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
3771 | &rbd_dev->header_oloc, buf, buf_size, | |
3772 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
3773 | } |
3774 | ||
ed95b21a ID |
3775 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
3776 | enum rbd_notify_op notify_op) | |
b30a01f2 | 3777 | { |
8ae0299a | 3778 | __rbd_notify_op_lock(rbd_dev, notify_op, NULL, NULL); |
ed95b21a | 3779 | } |
b30a01f2 | 3780 | |
ed95b21a ID |
3781 | static void rbd_notify_acquired_lock(struct work_struct *work) |
3782 | { | |
3783 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3784 | acquired_lock_work); | |
76756a51 | 3785 | |
ed95b21a | 3786 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
3787 | } |
3788 | ||
ed95b21a | 3789 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 3790 | { |
ed95b21a ID |
3791 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
3792 | released_lock_work); | |
811c6688 | 3793 | |
ed95b21a | 3794 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
3795 | } |
3796 | ||
ed95b21a | 3797 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 3798 | { |
ed95b21a ID |
3799 | struct page **reply_pages; |
3800 | size_t reply_len; | |
3801 | bool lock_owner_responded = false; | |
36be9a76 AE |
3802 | int ret; |
3803 | ||
ed95b21a | 3804 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 3805 | |
ed95b21a ID |
3806 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
3807 | &reply_pages, &reply_len); | |
3808 | if (ret && ret != -ETIMEDOUT) { | |
3809 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 3810 | goto out; |
ed95b21a | 3811 | } |
36be9a76 | 3812 | |
ed95b21a ID |
3813 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
3814 | void *p = page_address(reply_pages[0]); | |
3815 | void *const end = p + reply_len; | |
3816 | u32 n; | |
36be9a76 | 3817 | |
ed95b21a ID |
3818 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
3819 | while (n--) { | |
3820 | u8 struct_v; | |
3821 | u32 len; | |
36be9a76 | 3822 | |
ed95b21a ID |
3823 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
3824 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 3825 | |
ed95b21a ID |
3826 | ceph_decode_32_safe(&p, end, len, e_inval); |
3827 | if (!len) | |
3828 | continue; | |
3829 | ||
3830 | if (lock_owner_responded) { | |
3831 | rbd_warn(rbd_dev, | |
3832 | "duplicate lock owners detected"); | |
3833 | ret = -EIO; | |
3834 | goto out; | |
3835 | } | |
3836 | ||
3837 | lock_owner_responded = true; | |
3838 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
3839 | &struct_v, &len); | |
3840 | if (ret) { | |
3841 | rbd_warn(rbd_dev, | |
3842 | "failed to decode ResponseMessage: %d", | |
3843 | ret); | |
3844 | goto e_inval; | |
3845 | } | |
3846 | ||
3847 | ret = ceph_decode_32(&p); | |
3848 | } | |
3849 | } | |
3850 | ||
3851 | if (!lock_owner_responded) { | |
3852 | rbd_warn(rbd_dev, "no lock owners detected"); | |
3853 | ret = -ETIMEDOUT; | |
3854 | } | |
3855 | ||
3856 | out: | |
3857 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
3858 | return ret; | |
3859 | ||
3860 | e_inval: | |
3861 | ret = -EINVAL; | |
3862 | goto out; | |
3863 | } | |
3864 | ||
637cd060 ID |
3865 | /* |
3866 | * Either image request state machine(s) or rbd_add_acquire_lock() | |
3867 | * (i.e. "rbd map"). | |
3868 | */ | |
3869 | static void wake_lock_waiters(struct rbd_device *rbd_dev, int result) | |
ed95b21a | 3870 | { |
637cd060 ID |
3871 | struct rbd_img_request *img_req; |
3872 | ||
3873 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
d9b9c893 | 3874 | lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
ed95b21a ID |
3875 | |
3876 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
637cd060 ID |
3877 | if (!completion_done(&rbd_dev->acquire_wait)) { |
3878 | rbd_assert(list_empty(&rbd_dev->acquiring_list) && | |
3879 | list_empty(&rbd_dev->running_list)); | |
3880 | rbd_dev->acquire_err = result; | |
3881 | complete_all(&rbd_dev->acquire_wait); | |
3882 | return; | |
3883 | } | |
3884 | ||
3885 | list_for_each_entry(img_req, &rbd_dev->acquiring_list, lock_item) { | |
3886 | mutex_lock(&img_req->state_mutex); | |
3887 | rbd_assert(img_req->state == RBD_IMG_EXCLUSIVE_LOCK); | |
3888 | rbd_img_schedule(img_req, result); | |
3889 | mutex_unlock(&img_req->state_mutex); | |
3890 | } | |
3891 | ||
3892 | list_splice_tail_init(&rbd_dev->acquiring_list, &rbd_dev->running_list); | |
ed95b21a ID |
3893 | } |
3894 | ||
3895 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
3896 | struct ceph_locker **lockers, u32 *num_lockers) | |
3897 | { | |
3898 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3899 | u8 lock_type; | |
3900 | char *lock_tag; | |
3901 | int ret; | |
3902 | ||
3903 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3904 | ||
3905 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
3906 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3907 | &lock_type, &lock_tag, lockers, num_lockers); | |
3908 | if (ret) | |
3909 | return ret; | |
3910 | ||
3911 | if (*num_lockers == 0) { | |
3912 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
3913 | goto out; | |
3914 | } | |
3915 | ||
3916 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
3917 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
3918 | lock_tag); | |
3919 | ret = -EBUSY; | |
3920 | goto out; | |
3921 | } | |
3922 | ||
3923 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
3924 | rbd_warn(rbd_dev, "shared lock type detected"); | |
3925 | ret = -EBUSY; | |
3926 | goto out; | |
3927 | } | |
3928 | ||
3929 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
3930 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
3931 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
3932 | (*lockers)[0].id.cookie); | |
3933 | ret = -EBUSY; | |
3934 | goto out; | |
3935 | } | |
3936 | ||
3937 | out: | |
3938 | kfree(lock_tag); | |
3939 | return ret; | |
3940 | } | |
3941 | ||
3942 | static int find_watcher(struct rbd_device *rbd_dev, | |
3943 | const struct ceph_locker *locker) | |
3944 | { | |
3945 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3946 | struct ceph_watch_item *watchers; | |
3947 | u32 num_watchers; | |
3948 | u64 cookie; | |
3949 | int i; | |
3950 | int ret; | |
3951 | ||
3952 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
3953 | &rbd_dev->header_oloc, &watchers, | |
3954 | &num_watchers); | |
3955 | if (ret) | |
3956 | return ret; | |
3957 | ||
3958 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
3959 | for (i = 0; i < num_watchers; i++) { | |
3960 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
3961 | sizeof(locker->info.addr)) && | |
3962 | watchers[i].cookie == cookie) { | |
3963 | struct rbd_client_id cid = { | |
3964 | .gid = le64_to_cpu(watchers[i].name.num), | |
3965 | .handle = cookie, | |
3966 | }; | |
3967 | ||
3968 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
3969 | rbd_dev, cid.gid, cid.handle); | |
3970 | rbd_set_owner_cid(rbd_dev, &cid); | |
3971 | ret = 1; | |
3972 | goto out; | |
3973 | } | |
3974 | } | |
3975 | ||
3976 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
3977 | ret = 0; | |
3978 | out: | |
3979 | kfree(watchers); | |
3980 | return ret; | |
3981 | } | |
3982 | ||
3983 | /* | |
3984 | * lock_rwsem must be held for write | |
3985 | */ | |
3986 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
3987 | { | |
3988 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3989 | struct ceph_locker *lockers; | |
3990 | u32 num_lockers; | |
3991 | int ret; | |
3992 | ||
3993 | for (;;) { | |
3994 | ret = rbd_lock(rbd_dev); | |
3995 | if (ret != -EBUSY) | |
3996 | return ret; | |
3997 | ||
3998 | /* determine if the current lock holder is still alive */ | |
3999 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
4000 | if (ret) | |
4001 | return ret; | |
4002 | ||
4003 | if (num_lockers == 0) | |
4004 | goto again; | |
4005 | ||
4006 | ret = find_watcher(rbd_dev, lockers); | |
637cd060 ID |
4007 | if (ret) |
4008 | goto out; /* request lock or error */ | |
ed95b21a | 4009 | |
22e8bd51 | 4010 | rbd_warn(rbd_dev, "breaking header lock owned by %s%llu", |
ed95b21a ID |
4011 | ENTITY_NAME(lockers[0].id.name)); |
4012 | ||
0b98acd6 | 4013 | ret = ceph_monc_blocklist_add(&client->monc, |
ed95b21a ID |
4014 | &lockers[0].info.addr); |
4015 | if (ret) { | |
0b98acd6 | 4016 | rbd_warn(rbd_dev, "blocklist of %s%llu failed: %d", |
ed95b21a ID |
4017 | ENTITY_NAME(lockers[0].id.name), ret); |
4018 | goto out; | |
4019 | } | |
4020 | ||
4021 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
4022 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
4023 | lockers[0].id.cookie, | |
4024 | &lockers[0].id.name); | |
4025 | if (ret && ret != -ENOENT) | |
4026 | goto out; | |
4027 | ||
4028 | again: | |
4029 | ceph_free_lockers(lockers, num_lockers); | |
4030 | } | |
4031 | ||
4032 | out: | |
4033 | ceph_free_lockers(lockers, num_lockers); | |
4034 | return ret; | |
4035 | } | |
4036 | ||
22e8bd51 ID |
4037 | static int rbd_post_acquire_action(struct rbd_device *rbd_dev) |
4038 | { | |
4039 | int ret; | |
4040 | ||
4041 | if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) { | |
4042 | ret = rbd_object_map_open(rbd_dev); | |
4043 | if (ret) | |
4044 | return ret; | |
4045 | } | |
4046 | ||
4047 | return 0; | |
4048 | } | |
4049 | ||
ed95b21a | 4050 | /* |
637cd060 ID |
4051 | * Return: |
4052 | * 0 - lock acquired | |
4053 | * 1 - caller should call rbd_request_lock() | |
4054 | * <0 - error | |
ed95b21a | 4055 | */ |
637cd060 | 4056 | static int rbd_try_acquire_lock(struct rbd_device *rbd_dev) |
ed95b21a | 4057 | { |
637cd060 | 4058 | int ret; |
ed95b21a ID |
4059 | |
4060 | down_read(&rbd_dev->lock_rwsem); | |
4061 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
4062 | rbd_dev->lock_state); | |
4063 | if (__rbd_is_lock_owner(rbd_dev)) { | |
ed95b21a | 4064 | up_read(&rbd_dev->lock_rwsem); |
637cd060 | 4065 | return 0; |
ed95b21a ID |
4066 | } |
4067 | ||
4068 | up_read(&rbd_dev->lock_rwsem); | |
4069 | down_write(&rbd_dev->lock_rwsem); | |
4070 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
4071 | rbd_dev->lock_state); | |
637cd060 ID |
4072 | if (__rbd_is_lock_owner(rbd_dev)) { |
4073 | up_write(&rbd_dev->lock_rwsem); | |
4074 | return 0; | |
ed95b21a ID |
4075 | } |
4076 | ||
637cd060 ID |
4077 | ret = rbd_try_lock(rbd_dev); |
4078 | if (ret < 0) { | |
4079 | rbd_warn(rbd_dev, "failed to lock header: %d", ret); | |
0b98acd6 | 4080 | if (ret == -EBLOCKLISTED) |
637cd060 ID |
4081 | goto out; |
4082 | ||
4083 | ret = 1; /* request lock anyway */ | |
4084 | } | |
4085 | if (ret > 0) { | |
4086 | up_write(&rbd_dev->lock_rwsem); | |
4087 | return ret; | |
4088 | } | |
4089 | ||
4090 | rbd_assert(rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED); | |
4091 | rbd_assert(list_empty(&rbd_dev->running_list)); | |
4092 | ||
22e8bd51 ID |
4093 | ret = rbd_post_acquire_action(rbd_dev); |
4094 | if (ret) { | |
4095 | rbd_warn(rbd_dev, "post-acquire action failed: %d", ret); | |
4096 | /* | |
4097 | * Can't stay in RBD_LOCK_STATE_LOCKED because | |
4098 | * rbd_lock_add_request() would let the request through, | |
4099 | * assuming that e.g. object map is locked and loaded. | |
4100 | */ | |
4101 | rbd_unlock(rbd_dev); | |
ed95b21a ID |
4102 | } |
4103 | ||
637cd060 ID |
4104 | out: |
4105 | wake_lock_waiters(rbd_dev, ret); | |
ed95b21a | 4106 | up_write(&rbd_dev->lock_rwsem); |
637cd060 | 4107 | return ret; |
ed95b21a ID |
4108 | } |
4109 | ||
4110 | static void rbd_acquire_lock(struct work_struct *work) | |
4111 | { | |
4112 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
4113 | struct rbd_device, lock_dwork); | |
637cd060 | 4114 | int ret; |
ed95b21a ID |
4115 | |
4116 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
4117 | again: | |
637cd060 ID |
4118 | ret = rbd_try_acquire_lock(rbd_dev); |
4119 | if (ret <= 0) { | |
4120 | dout("%s rbd_dev %p ret %d - done\n", __func__, rbd_dev, ret); | |
ed95b21a ID |
4121 | return; |
4122 | } | |
4123 | ||
4124 | ret = rbd_request_lock(rbd_dev); | |
4125 | if (ret == -ETIMEDOUT) { | |
4126 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
4127 | } else if (ret == -EROFS) { |
4128 | rbd_warn(rbd_dev, "peer will not release lock"); | |
637cd060 ID |
4129 | down_write(&rbd_dev->lock_rwsem); |
4130 | wake_lock_waiters(rbd_dev, ret); | |
4131 | up_write(&rbd_dev->lock_rwsem); | |
ed95b21a ID |
4132 | } else if (ret < 0) { |
4133 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
4134 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
4135 | RBD_RETRY_DELAY); | |
4136 | } else { | |
4137 | /* | |
4138 | * lock owner acked, but resend if we don't see them | |
4139 | * release the lock | |
4140 | */ | |
6b0a8774 | 4141 | dout("%s rbd_dev %p requeuing lock_dwork\n", __func__, |
ed95b21a ID |
4142 | rbd_dev); |
4143 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
4144 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
4145 | } | |
4146 | } | |
4147 | ||
a2b1da09 | 4148 | static bool rbd_quiesce_lock(struct rbd_device *rbd_dev) |
ed95b21a | 4149 | { |
e1fddc8f ID |
4150 | bool need_wait; |
4151 | ||
a2b1da09 | 4152 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
d9b9c893 | 4153 | lockdep_assert_held_write(&rbd_dev->lock_rwsem); |
a2b1da09 | 4154 | |
ed95b21a ID |
4155 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) |
4156 | return false; | |
4157 | ||
52bb1f9b | 4158 | /* |
ed95b21a | 4159 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 4160 | */ |
e1fddc8f ID |
4161 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; |
4162 | rbd_assert(!completion_done(&rbd_dev->releasing_wait)); | |
4163 | need_wait = !list_empty(&rbd_dev->running_list); | |
4164 | downgrade_write(&rbd_dev->lock_rwsem); | |
4165 | if (need_wait) | |
4166 | wait_for_completion(&rbd_dev->releasing_wait); | |
ed95b21a ID |
4167 | up_read(&rbd_dev->lock_rwsem); |
4168 | ||
4169 | down_write(&rbd_dev->lock_rwsem); | |
ed95b21a ID |
4170 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) |
4171 | return false; | |
4172 | ||
e1fddc8f | 4173 | rbd_assert(list_empty(&rbd_dev->running_list)); |
a2b1da09 ID |
4174 | return true; |
4175 | } | |
4176 | ||
22e8bd51 ID |
4177 | static void rbd_pre_release_action(struct rbd_device *rbd_dev) |
4178 | { | |
4179 | if (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP) | |
4180 | rbd_object_map_close(rbd_dev); | |
4181 | } | |
4182 | ||
e1fddc8f ID |
4183 | static void __rbd_release_lock(struct rbd_device *rbd_dev) |
4184 | { | |
4185 | rbd_assert(list_empty(&rbd_dev->running_list)); | |
4186 | ||
22e8bd51 | 4187 | rbd_pre_release_action(rbd_dev); |
bbead745 | 4188 | rbd_unlock(rbd_dev); |
e1fddc8f ID |
4189 | } |
4190 | ||
a2b1da09 ID |
4191 | /* |
4192 | * lock_rwsem must be held for write | |
4193 | */ | |
4194 | static void rbd_release_lock(struct rbd_device *rbd_dev) | |
4195 | { | |
4196 | if (!rbd_quiesce_lock(rbd_dev)) | |
4197 | return; | |
4198 | ||
e1fddc8f | 4199 | __rbd_release_lock(rbd_dev); |
a2b1da09 | 4200 | |
bbead745 ID |
4201 | /* |
4202 | * Give others a chance to grab the lock - we would re-acquire | |
637cd060 ID |
4203 | * almost immediately if we got new IO while draining the running |
4204 | * list otherwise. We need to ack our own notifications, so this | |
4205 | * lock_dwork will be requeued from rbd_handle_released_lock() by | |
4206 | * way of maybe_kick_acquire(). | |
bbead745 ID |
4207 | */ |
4208 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
4209 | } |
4210 | ||
4211 | static void rbd_release_lock_work(struct work_struct *work) | |
4212 | { | |
4213 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
4214 | unlock_work); | |
4215 | ||
4216 | down_write(&rbd_dev->lock_rwsem); | |
4217 | rbd_release_lock(rbd_dev); | |
4218 | up_write(&rbd_dev->lock_rwsem); | |
4219 | } | |
4220 | ||
637cd060 ID |
4221 | static void maybe_kick_acquire(struct rbd_device *rbd_dev) |
4222 | { | |
4223 | bool have_requests; | |
4224 | ||
4225 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
4226 | if (__rbd_is_lock_owner(rbd_dev)) | |
4227 | return; | |
4228 | ||
4229 | spin_lock(&rbd_dev->lock_lists_lock); | |
4230 | have_requests = !list_empty(&rbd_dev->acquiring_list); | |
4231 | spin_unlock(&rbd_dev->lock_lists_lock); | |
4232 | if (have_requests || delayed_work_pending(&rbd_dev->lock_dwork)) { | |
4233 | dout("%s rbd_dev %p kicking lock_dwork\n", __func__, rbd_dev); | |
4234 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
4235 | } | |
4236 | } | |
4237 | ||
ed95b21a ID |
4238 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, |
4239 | void **p) | |
4240 | { | |
4241 | struct rbd_client_id cid = { 0 }; | |
4242 | ||
4243 | if (struct_v >= 2) { | |
4244 | cid.gid = ceph_decode_64(p); | |
4245 | cid.handle = ceph_decode_64(p); | |
4246 | } | |
4247 | ||
4248 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
4249 | cid.handle); | |
4250 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
4251 | down_write(&rbd_dev->lock_rwsem); | |
4252 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
4253 | /* | |
4254 | * we already know that the remote client is | |
4255 | * the owner | |
4256 | */ | |
4257 | up_write(&rbd_dev->lock_rwsem); | |
4258 | return; | |
4259 | } | |
4260 | ||
4261 | rbd_set_owner_cid(rbd_dev, &cid); | |
4262 | downgrade_write(&rbd_dev->lock_rwsem); | |
4263 | } else { | |
4264 | down_read(&rbd_dev->lock_rwsem); | |
4265 | } | |
4266 | ||
637cd060 | 4267 | maybe_kick_acquire(rbd_dev); |
ed95b21a ID |
4268 | up_read(&rbd_dev->lock_rwsem); |
4269 | } | |
4270 | ||
4271 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
4272 | void **p) | |
4273 | { | |
4274 | struct rbd_client_id cid = { 0 }; | |
4275 | ||
4276 | if (struct_v >= 2) { | |
4277 | cid.gid = ceph_decode_64(p); | |
4278 | cid.handle = ceph_decode_64(p); | |
4279 | } | |
4280 | ||
4281 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
4282 | cid.handle); | |
4283 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
4284 | down_write(&rbd_dev->lock_rwsem); | |
4285 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
4286 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
4287 | __func__, rbd_dev, cid.gid, cid.handle, | |
4288 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
4289 | up_write(&rbd_dev->lock_rwsem); | |
4290 | return; | |
4291 | } | |
4292 | ||
4293 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
4294 | downgrade_write(&rbd_dev->lock_rwsem); | |
4295 | } else { | |
4296 | down_read(&rbd_dev->lock_rwsem); | |
4297 | } | |
4298 | ||
637cd060 | 4299 | maybe_kick_acquire(rbd_dev); |
ed95b21a ID |
4300 | up_read(&rbd_dev->lock_rwsem); |
4301 | } | |
4302 | ||
3b77faa0 ID |
4303 | /* |
4304 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
4305 | * ResponseMessage is needed. | |
4306 | */ | |
4307 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
4308 | void **p) | |
ed95b21a ID |
4309 | { |
4310 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
4311 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 4312 | int result = 1; |
ed95b21a ID |
4313 | |
4314 | if (struct_v >= 2) { | |
4315 | cid.gid = ceph_decode_64(p); | |
4316 | cid.handle = ceph_decode_64(p); | |
4317 | } | |
4318 | ||
4319 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
4320 | cid.handle); | |
4321 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 4322 | return result; |
ed95b21a ID |
4323 | |
4324 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
4325 | if (__rbd_is_lock_owner(rbd_dev)) { |
4326 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
4327 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
4328 | goto out_unlock; | |
4329 | ||
4330 | /* | |
4331 | * encode ResponseMessage(0) so the peer can detect | |
4332 | * a missing owner | |
4333 | */ | |
4334 | result = 0; | |
4335 | ||
4336 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
4337 | if (!rbd_dev->opts->exclusive) { |
4338 | dout("%s rbd_dev %p queueing unlock_work\n", | |
4339 | __func__, rbd_dev); | |
4340 | queue_work(rbd_dev->task_wq, | |
4341 | &rbd_dev->unlock_work); | |
4342 | } else { | |
4343 | /* refuse to release the lock */ | |
4344 | result = -EROFS; | |
4345 | } | |
ed95b21a ID |
4346 | } |
4347 | } | |
3b77faa0 ID |
4348 | |
4349 | out_unlock: | |
ed95b21a | 4350 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 4351 | return result; |
ed95b21a ID |
4352 | } |
4353 | ||
4354 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
4355 | u64 notify_id, u64 cookie, s32 *result) | |
4356 | { | |
4357 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
08a79102 KS |
4358 | char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
4359 | int buf_size = sizeof(buf); | |
ed95b21a ID |
4360 | int ret; |
4361 | ||
4362 | if (result) { | |
4363 | void *p = buf; | |
4364 | ||
4365 | /* encode ResponseMessage */ | |
4366 | ceph_start_encoding(&p, 1, 1, | |
4367 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
4368 | ceph_encode_32(&p, *result); | |
4369 | } else { | |
4370 | buf_size = 0; | |
4371 | } | |
b8d70035 | 4372 | |
922dab61 ID |
4373 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
4374 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 4375 | buf, buf_size); |
52bb1f9b | 4376 | if (ret) |
ed95b21a ID |
4377 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
4378 | } | |
4379 | ||
4380 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
4381 | u64 cookie) | |
4382 | { | |
4383 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
4384 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
4385 | } | |
4386 | ||
4387 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
4388 | u64 notify_id, u64 cookie, s32 result) | |
4389 | { | |
4390 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
4391 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
4392 | } | |
4393 | ||
4394 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
4395 | u64 notifier_id, void *data, size_t data_len) | |
4396 | { | |
4397 | struct rbd_device *rbd_dev = arg; | |
4398 | void *p = data; | |
4399 | void *const end = p + data_len; | |
d4c2269b | 4400 | u8 struct_v = 0; |
ed95b21a ID |
4401 | u32 len; |
4402 | u32 notify_op; | |
4403 | int ret; | |
4404 | ||
4405 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
4406 | __func__, rbd_dev, cookie, notify_id, data_len); | |
4407 | if (data_len) { | |
4408 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
4409 | &struct_v, &len); | |
4410 | if (ret) { | |
4411 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
4412 | ret); | |
4413 | return; | |
4414 | } | |
4415 | ||
4416 | notify_op = ceph_decode_32(&p); | |
4417 | } else { | |
4418 | /* legacy notification for header updates */ | |
4419 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
4420 | len = 0; | |
4421 | } | |
4422 | ||
4423 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
4424 | switch (notify_op) { | |
4425 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
4426 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
4427 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
4428 | break; | |
4429 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
4430 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
4431 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
4432 | break; | |
4433 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
4434 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
4435 | if (ret <= 0) | |
ed95b21a | 4436 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 4437 | cookie, ret); |
ed95b21a ID |
4438 | else |
4439 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
4440 | break; | |
4441 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
4442 | ret = rbd_dev_refresh(rbd_dev); | |
4443 | if (ret) | |
4444 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
4445 | ||
4446 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
4447 | break; | |
4448 | default: | |
4449 | if (rbd_is_lock_owner(rbd_dev)) | |
4450 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
4451 | cookie, -EOPNOTSUPP); | |
4452 | else | |
4453 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
4454 | break; | |
4455 | } | |
b8d70035 AE |
4456 | } |
4457 | ||
99d16943 ID |
4458 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
4459 | ||
922dab61 | 4460 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 4461 | { |
922dab61 | 4462 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 4463 | |
922dab61 | 4464 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 4465 | |
ed95b21a ID |
4466 | down_write(&rbd_dev->lock_rwsem); |
4467 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
4468 | up_write(&rbd_dev->lock_rwsem); | |
4469 | ||
99d16943 ID |
4470 | mutex_lock(&rbd_dev->watch_mutex); |
4471 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
4472 | __rbd_unregister_watch(rbd_dev); | |
4473 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 4474 | |
99d16943 | 4475 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 4476 | } |
99d16943 | 4477 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
4478 | } |
4479 | ||
9969ebc5 | 4480 | /* |
99d16943 | 4481 | * watch_mutex must be locked |
9969ebc5 | 4482 | */ |
99d16943 | 4483 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
4484 | { |
4485 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 4486 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 4487 | |
922dab61 | 4488 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 4489 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 4490 | |
922dab61 ID |
4491 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
4492 | &rbd_dev->header_oloc, rbd_watch_cb, | |
4493 | rbd_watch_errcb, rbd_dev); | |
4494 | if (IS_ERR(handle)) | |
4495 | return PTR_ERR(handle); | |
8eb87565 | 4496 | |
922dab61 | 4497 | rbd_dev->watch_handle = handle; |
b30a01f2 | 4498 | return 0; |
b30a01f2 ID |
4499 | } |
4500 | ||
99d16943 ID |
4501 | /* |
4502 | * watch_mutex must be locked | |
4503 | */ | |
4504 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 4505 | { |
922dab61 ID |
4506 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4507 | int ret; | |
b30a01f2 | 4508 | |
99d16943 ID |
4509 | rbd_assert(rbd_dev->watch_handle); |
4510 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 4511 | |
922dab61 ID |
4512 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
4513 | if (ret) | |
4514 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 4515 | |
922dab61 | 4516 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
4517 | } |
4518 | ||
99d16943 ID |
4519 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
4520 | { | |
4521 | int ret; | |
4522 | ||
4523 | mutex_lock(&rbd_dev->watch_mutex); | |
4524 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
4525 | ret = __rbd_register_watch(rbd_dev); | |
4526 | if (ret) | |
4527 | goto out; | |
4528 | ||
4529 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
4530 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
4531 | ||
4532 | out: | |
4533 | mutex_unlock(&rbd_dev->watch_mutex); | |
4534 | return ret; | |
4535 | } | |
4536 | ||
4537 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 4538 | { |
99d16943 ID |
4539 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
4540 | ||
ed95b21a ID |
4541 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
4542 | cancel_work_sync(&rbd_dev->released_lock_work); | |
4543 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
4544 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
4545 | } |
4546 | ||
0e4e1de5 ID |
4547 | /* |
4548 | * header_rwsem must not be held to avoid a deadlock with | |
4549 | * rbd_dev_refresh() when flushing notifies. | |
4550 | */ | |
99d16943 ID |
4551 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) |
4552 | { | |
4553 | cancel_tasks_sync(rbd_dev); | |
4554 | ||
4555 | mutex_lock(&rbd_dev->watch_mutex); | |
4556 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
4557 | __rbd_unregister_watch(rbd_dev); | |
4558 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4559 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 4560 | |
23edca86 | 4561 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
811c6688 | 4562 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
4563 | } |
4564 | ||
14bb211d ID |
4565 | /* |
4566 | * lock_rwsem must be held for write | |
4567 | */ | |
4568 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
4569 | { | |
4570 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
4571 | char cookie[32]; | |
4572 | int ret; | |
4573 | ||
a2b1da09 ID |
4574 | if (!rbd_quiesce_lock(rbd_dev)) |
4575 | return; | |
14bb211d ID |
4576 | |
4577 | format_lock_cookie(rbd_dev, cookie); | |
4578 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
4579 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
4580 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
4581 | RBD_LOCK_TAG, cookie); | |
4582 | if (ret) { | |
4583 | if (ret != -EOPNOTSUPP) | |
4584 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
4585 | ret); | |
4586 | ||
4587 | /* | |
4588 | * Lock cookie cannot be updated on older OSDs, so do | |
4589 | * a manual release and queue an acquire. | |
4590 | */ | |
e1fddc8f | 4591 | __rbd_release_lock(rbd_dev); |
a2b1da09 | 4592 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
14bb211d | 4593 | } else { |
edd8ca80 | 4594 | __rbd_lock(rbd_dev, cookie); |
637cd060 | 4595 | wake_lock_waiters(rbd_dev, 0); |
14bb211d ID |
4596 | } |
4597 | } | |
4598 | ||
99d16943 ID |
4599 | static void rbd_reregister_watch(struct work_struct *work) |
4600 | { | |
4601 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
4602 | struct rbd_device, watch_dwork); | |
4603 | int ret; | |
4604 | ||
4605 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
4606 | ||
4607 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
4608 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
4609 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 4610 | return; |
87c0fded | 4611 | } |
99d16943 ID |
4612 | |
4613 | ret = __rbd_register_watch(rbd_dev); | |
4614 | if (ret) { | |
4615 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
0b98acd6 | 4616 | if (ret != -EBLOCKLISTED && ret != -ENOENT) { |
99d16943 ID |
4617 | queue_delayed_work(rbd_dev->task_wq, |
4618 | &rbd_dev->watch_dwork, | |
4619 | RBD_RETRY_DELAY); | |
637cd060 ID |
4620 | mutex_unlock(&rbd_dev->watch_mutex); |
4621 | return; | |
87c0fded | 4622 | } |
637cd060 | 4623 | |
87c0fded | 4624 | mutex_unlock(&rbd_dev->watch_mutex); |
637cd060 ID |
4625 | down_write(&rbd_dev->lock_rwsem); |
4626 | wake_lock_waiters(rbd_dev, ret); | |
4627 | up_write(&rbd_dev->lock_rwsem); | |
14bb211d | 4628 | return; |
99d16943 ID |
4629 | } |
4630 | ||
4631 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
4632 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
4633 | mutex_unlock(&rbd_dev->watch_mutex); | |
4634 | ||
14bb211d ID |
4635 | down_write(&rbd_dev->lock_rwsem); |
4636 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
4637 | rbd_reacquire_lock(rbd_dev); | |
4638 | up_write(&rbd_dev->lock_rwsem); | |
4639 | ||
99d16943 ID |
4640 | ret = rbd_dev_refresh(rbd_dev); |
4641 | if (ret) | |
f6870cc9 | 4642 | rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
99d16943 ID |
4643 | } |
4644 | ||
36be9a76 | 4645 | /* |
f40eb349 AE |
4646 | * Synchronous osd object method call. Returns the number of bytes |
4647 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
4648 | */ |
4649 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
4650 | struct ceph_object_id *oid, |
4651 | struct ceph_object_locator *oloc, | |
36be9a76 | 4652 | const char *method_name, |
4157976b | 4653 | const void *outbound, |
36be9a76 | 4654 | size_t outbound_size, |
4157976b | 4655 | void *inbound, |
e2a58ee5 | 4656 | size_t inbound_size) |
36be9a76 | 4657 | { |
ecd4a68a ID |
4658 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4659 | struct page *req_page = NULL; | |
4660 | struct page *reply_page; | |
36be9a76 AE |
4661 | int ret; |
4662 | ||
4663 | /* | |
6010a451 AE |
4664 | * Method calls are ultimately read operations. The result |
4665 | * should placed into the inbound buffer provided. They | |
4666 | * also supply outbound data--parameters for the object | |
4667 | * method. Currently if this is present it will be a | |
4668 | * snapshot id. | |
36be9a76 | 4669 | */ |
ecd4a68a ID |
4670 | if (outbound) { |
4671 | if (outbound_size > PAGE_SIZE) | |
4672 | return -E2BIG; | |
36be9a76 | 4673 | |
ecd4a68a ID |
4674 | req_page = alloc_page(GFP_KERNEL); |
4675 | if (!req_page) | |
4676 | return -ENOMEM; | |
04017e29 | 4677 | |
ecd4a68a | 4678 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 4679 | } |
36be9a76 | 4680 | |
ecd4a68a ID |
4681 | reply_page = alloc_page(GFP_KERNEL); |
4682 | if (!reply_page) { | |
4683 | if (req_page) | |
4684 | __free_page(req_page); | |
4685 | return -ENOMEM; | |
4686 | } | |
57385b51 | 4687 | |
ecd4a68a ID |
4688 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
4689 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
68ada915 | 4690 | &reply_page, &inbound_size); |
ecd4a68a ID |
4691 | if (!ret) { |
4692 | memcpy(inbound, page_address(reply_page), inbound_size); | |
4693 | ret = inbound_size; | |
4694 | } | |
36be9a76 | 4695 | |
ecd4a68a ID |
4696 | if (req_page) |
4697 | __free_page(req_page); | |
4698 | __free_page(reply_page); | |
36be9a76 AE |
4699 | return ret; |
4700 | } | |
4701 | ||
7ad18afa | 4702 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 4703 | { |
59e542c8 ID |
4704 | struct rbd_img_request *img_request = |
4705 | container_of(work, struct rbd_img_request, work); | |
4706 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
4707 | enum obj_operation_type op_type = img_request->op_type; | |
4708 | struct request *rq = blk_mq_rq_from_pdu(img_request); | |
bc1ecc65 ID |
4709 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
4710 | u64 length = blk_rq_bytes(rq); | |
4e752f0a | 4711 | u64 mapping_size; |
bf0d5f50 AE |
4712 | int result; |
4713 | ||
bc1ecc65 | 4714 | /* Ignore/skip any zero-length requests */ |
bc1ecc65 ID |
4715 | if (!length) { |
4716 | dout("%s: zero-length request\n", __func__); | |
4717 | result = 0; | |
59e542c8 | 4718 | goto err_img_request; |
bc1ecc65 | 4719 | } |
4dda41d3 | 4720 | |
7ad18afa CH |
4721 | blk_mq_start_request(rq); |
4722 | ||
4e752f0a JD |
4723 | down_read(&rbd_dev->header_rwsem); |
4724 | mapping_size = rbd_dev->mapping.size; | |
a52cc685 | 4725 | rbd_img_capture_header(img_request); |
4e752f0a JD |
4726 | up_read(&rbd_dev->header_rwsem); |
4727 | ||
4728 | if (offset + length > mapping_size) { | |
bc1ecc65 | 4729 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 4730 | length, mapping_size); |
bc1ecc65 | 4731 | result = -EIO; |
a52cc685 | 4732 | goto err_img_request; |
bc1ecc65 | 4733 | } |
bf0d5f50 | 4734 | |
21ed05a8 ID |
4735 | dout("%s rbd_dev %p img_req %p %s %llu~%llu\n", __func__, rbd_dev, |
4736 | img_request, obj_op_name(op_type), offset, length); | |
4737 | ||
6484cbe9 | 4738 | if (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_ZEROOUT) |
5a237819 | 4739 | result = rbd_img_fill_nodata(img_request, offset, length); |
90e98c52 | 4740 | else |
5a237819 ID |
4741 | result = rbd_img_fill_from_bio(img_request, offset, length, |
4742 | rq->bio); | |
0192ce2e | 4743 | if (result) |
bc1ecc65 | 4744 | goto err_img_request; |
bf0d5f50 | 4745 | |
e1fddc8f | 4746 | rbd_img_handle_request(img_request, 0); |
bc1ecc65 | 4747 | return; |
bf0d5f50 | 4748 | |
bc1ecc65 | 4749 | err_img_request: |
679a97d2 | 4750 | rbd_img_request_destroy(img_request); |
bc1ecc65 ID |
4751 | if (result) |
4752 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 4753 | obj_op_name(op_type), length, offset, result); |
2a842aca | 4754 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 4755 | } |
bf0d5f50 | 4756 | |
fc17b653 | 4757 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 4758 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 4759 | { |
59e542c8 ID |
4760 | struct rbd_device *rbd_dev = hctx->queue->queuedata; |
4761 | struct rbd_img_request *img_req = blk_mq_rq_to_pdu(bd->rq); | |
4762 | enum obj_operation_type op_type; | |
bf0d5f50 | 4763 | |
59e542c8 ID |
4764 | switch (req_op(bd->rq)) { |
4765 | case REQ_OP_DISCARD: | |
4766 | op_type = OBJ_OP_DISCARD; | |
4767 | break; | |
4768 | case REQ_OP_WRITE_ZEROES: | |
4769 | op_type = OBJ_OP_ZEROOUT; | |
4770 | break; | |
4771 | case REQ_OP_WRITE: | |
4772 | op_type = OBJ_OP_WRITE; | |
4773 | break; | |
4774 | case REQ_OP_READ: | |
4775 | op_type = OBJ_OP_READ; | |
4776 | break; | |
4777 | default: | |
4778 | rbd_warn(rbd_dev, "unknown req_op %d", req_op(bd->rq)); | |
4779 | return BLK_STS_IOERR; | |
4780 | } | |
4781 | ||
4782 | rbd_img_request_init(img_req, rbd_dev, op_type); | |
4783 | ||
4784 | if (rbd_img_is_write(img_req)) { | |
4785 | if (rbd_is_ro(rbd_dev)) { | |
4786 | rbd_warn(rbd_dev, "%s on read-only mapping", | |
4787 | obj_op_name(img_req->op_type)); | |
4788 | return BLK_STS_IOERR; | |
4789 | } | |
4790 | rbd_assert(!rbd_is_snap(rbd_dev)); | |
4791 | } | |
4792 | ||
4793 | INIT_WORK(&img_req->work, rbd_queue_workfn); | |
4794 | queue_work(rbd_wq, &img_req->work); | |
fc17b653 | 4795 | return BLK_STS_OK; |
bf0d5f50 AE |
4796 | } |
4797 | ||
602adf40 YS |
4798 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
4799 | { | |
5769ed0c ID |
4800 | blk_cleanup_queue(rbd_dev->disk->queue); |
4801 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
4802 | put_disk(rbd_dev->disk); | |
a0cab924 | 4803 | rbd_dev->disk = NULL; |
602adf40 YS |
4804 | } |
4805 | ||
788e2df3 | 4806 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
4807 | struct ceph_object_id *oid, |
4808 | struct ceph_object_locator *oloc, | |
4809 | void *buf, int buf_len) | |
788e2df3 AE |
4810 | |
4811 | { | |
fe5478e0 ID |
4812 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4813 | struct ceph_osd_request *req; | |
4814 | struct page **pages; | |
4815 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
4816 | int ret; |
4817 | ||
fe5478e0 ID |
4818 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
4819 | if (!req) | |
4820 | return -ENOMEM; | |
788e2df3 | 4821 | |
fe5478e0 ID |
4822 | ceph_oid_copy(&req->r_base_oid, oid); |
4823 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
4824 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 4825 | |
fe5478e0 ID |
4826 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
4827 | if (IS_ERR(pages)) { | |
4828 | ret = PTR_ERR(pages); | |
4829 | goto out_req; | |
4830 | } | |
1ceae7ef | 4831 | |
fe5478e0 ID |
4832 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
4833 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
4834 | true); | |
4835 | ||
26f887e0 ID |
4836 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
4837 | if (ret) | |
4838 | goto out_req; | |
4839 | ||
fe5478e0 ID |
4840 | ceph_osdc_start_request(osdc, req, false); |
4841 | ret = ceph_osdc_wait_request(osdc, req); | |
4842 | if (ret >= 0) | |
4843 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 4844 | |
fe5478e0 ID |
4845 | out_req: |
4846 | ceph_osdc_put_request(req); | |
788e2df3 AE |
4847 | return ret; |
4848 | } | |
4849 | ||
602adf40 | 4850 | /* |
662518b1 AE |
4851 | * Read the complete header for the given rbd device. On successful |
4852 | * return, the rbd_dev->header field will contain up-to-date | |
4853 | * information about the image. | |
602adf40 | 4854 | */ |
99a41ebc | 4855 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 4856 | { |
4156d998 | 4857 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 4858 | u32 snap_count = 0; |
4156d998 AE |
4859 | u64 names_size = 0; |
4860 | u32 want_count; | |
4861 | int ret; | |
602adf40 | 4862 | |
00f1f36f | 4863 | /* |
4156d998 AE |
4864 | * The complete header will include an array of its 64-bit |
4865 | * snapshot ids, followed by the names of those snapshots as | |
4866 | * a contiguous block of NUL-terminated strings. Note that | |
4867 | * the number of snapshots could change by the time we read | |
4868 | * it in, in which case we re-read it. | |
00f1f36f | 4869 | */ |
4156d998 AE |
4870 | do { |
4871 | size_t size; | |
4872 | ||
4873 | kfree(ondisk); | |
4874 | ||
4875 | size = sizeof (*ondisk); | |
4876 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
4877 | size += names_size; | |
4878 | ondisk = kmalloc(size, GFP_KERNEL); | |
4879 | if (!ondisk) | |
662518b1 | 4880 | return -ENOMEM; |
4156d998 | 4881 | |
fe5478e0 ID |
4882 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
4883 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 4884 | if (ret < 0) |
662518b1 | 4885 | goto out; |
c0cd10db | 4886 | if ((size_t)ret < size) { |
4156d998 | 4887 | ret = -ENXIO; |
06ecc6cb AE |
4888 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
4889 | size, ret); | |
662518b1 | 4890 | goto out; |
4156d998 AE |
4891 | } |
4892 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
4893 | ret = -ENXIO; | |
06ecc6cb | 4894 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 4895 | goto out; |
81e759fb | 4896 | } |
602adf40 | 4897 | |
4156d998 AE |
4898 | names_size = le64_to_cpu(ondisk->snap_names_len); |
4899 | want_count = snap_count; | |
4900 | snap_count = le32_to_cpu(ondisk->snap_count); | |
4901 | } while (snap_count != want_count); | |
00f1f36f | 4902 | |
662518b1 AE |
4903 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
4904 | out: | |
4156d998 AE |
4905 | kfree(ondisk); |
4906 | ||
4907 | return ret; | |
602adf40 YS |
4908 | } |
4909 | ||
9875201e JD |
4910 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
4911 | { | |
4912 | sector_t size; | |
9875201e JD |
4913 | |
4914 | /* | |
811c6688 ID |
4915 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
4916 | * try to update its size. If REMOVING is set, updating size | |
4917 | * is just useless work since the device can't be opened. | |
9875201e | 4918 | */ |
811c6688 ID |
4919 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
4920 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
4921 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
4922 | dout("setting size to %llu sectors", (unsigned long long)size); | |
4923 | set_capacity(rbd_dev->disk, size); | |
659e56ba | 4924 | revalidate_disk_size(rbd_dev->disk, true); |
9875201e JD |
4925 | } |
4926 | } | |
4927 | ||
cc4a38bd | 4928 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 4929 | { |
e627db08 | 4930 | u64 mapping_size; |
1fe5e993 AE |
4931 | int ret; |
4932 | ||
cfbf6377 | 4933 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 4934 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
4935 | |
4936 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 4937 | if (ret) |
73e39e4d | 4938 | goto out; |
15228ede | 4939 | |
e8f59b59 ID |
4940 | /* |
4941 | * If there is a parent, see if it has disappeared due to the | |
4942 | * mapped image getting flattened. | |
4943 | */ | |
4944 | if (rbd_dev->parent) { | |
4945 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4946 | if (ret) | |
73e39e4d | 4947 | goto out; |
e8f59b59 ID |
4948 | } |
4949 | ||
686238b7 ID |
4950 | rbd_assert(!rbd_is_snap(rbd_dev)); |
4951 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
15228ede | 4952 | |
73e39e4d | 4953 | out: |
cfbf6377 | 4954 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 4955 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 4956 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 4957 | |
73e39e4d | 4958 | return ret; |
1fe5e993 AE |
4959 | } |
4960 | ||
f363b089 | 4961 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 4962 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
4963 | }; |
4964 | ||
602adf40 YS |
4965 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
4966 | { | |
4967 | struct gendisk *disk; | |
4968 | struct request_queue *q; | |
420efbdf ID |
4969 | unsigned int objset_bytes = |
4970 | rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; | |
7ad18afa | 4971 | int err; |
602adf40 | 4972 | |
602adf40 | 4973 | /* create gendisk info */ |
7e513d43 ID |
4974 | disk = alloc_disk(single_major ? |
4975 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
4976 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 4977 | if (!disk) |
1fcdb8aa | 4978 | return -ENOMEM; |
602adf40 | 4979 | |
f0f8cef5 | 4980 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 4981 | rbd_dev->dev_id); |
602adf40 | 4982 | disk->major = rbd_dev->major; |
dd82fff1 | 4983 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
4984 | if (single_major) |
4985 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
4986 | disk->fops = &rbd_bd_ops; |
4987 | disk->private_data = rbd_dev; | |
4988 | ||
7ad18afa CH |
4989 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
4990 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 4991 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 4992 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
56d18f62 | 4993 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
f9b6b98d | 4994 | rbd_dev->tag_set.nr_hw_queues = num_present_cpus(); |
59e542c8 | 4995 | rbd_dev->tag_set.cmd_size = sizeof(struct rbd_img_request); |
7ad18afa CH |
4996 | |
4997 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
4998 | if (err) | |
602adf40 | 4999 | goto out_disk; |
029bcbd8 | 5000 | |
7ad18afa CH |
5001 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
5002 | if (IS_ERR(q)) { | |
5003 | err = PTR_ERR(q); | |
5004 | goto out_tag_set; | |
5005 | } | |
5006 | ||
8b904b5b | 5007 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
d8a2c89c | 5008 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
593a9e7b | 5009 | |
420efbdf | 5010 | blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
0d9fde4f | 5011 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 5012 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 5013 | blk_queue_max_segment_size(q, UINT_MAX); |
16d80c54 ID |
5014 | blk_queue_io_min(q, rbd_dev->opts->alloc_size); |
5015 | blk_queue_io_opt(q, rbd_dev->opts->alloc_size); | |
029bcbd8 | 5016 | |
d9360540 ID |
5017 | if (rbd_dev->opts->trim) { |
5018 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
16d80c54 | 5019 | q->limits.discard_granularity = rbd_dev->opts->alloc_size; |
d9360540 ID |
5020 | blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); |
5021 | blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
5022 | } | |
90e98c52 | 5023 | |
bae818ee | 5024 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
1cb039f3 | 5025 | blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q); |
bae818ee | 5026 | |
5769ed0c ID |
5027 | /* |
5028 | * disk_release() expects a queue ref from add_disk() and will | |
5029 | * put it. Hold an extra ref until add_disk() is called. | |
5030 | */ | |
5031 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 5032 | disk->queue = q; |
602adf40 YS |
5033 | q->queuedata = rbd_dev; |
5034 | ||
5035 | rbd_dev->disk = disk; | |
602adf40 | 5036 | |
602adf40 | 5037 | return 0; |
7ad18afa CH |
5038 | out_tag_set: |
5039 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
5040 | out_disk: |
5041 | put_disk(disk); | |
7ad18afa | 5042 | return err; |
602adf40 YS |
5043 | } |
5044 | ||
dfc5606d YS |
5045 | /* |
5046 | sysfs | |
5047 | */ | |
5048 | ||
593a9e7b AE |
5049 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
5050 | { | |
5051 | return container_of(dev, struct rbd_device, dev); | |
5052 | } | |
5053 | ||
dfc5606d YS |
5054 | static ssize_t rbd_size_show(struct device *dev, |
5055 | struct device_attribute *attr, char *buf) | |
5056 | { | |
593a9e7b | 5057 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 5058 | |
fc71d833 AE |
5059 | return sprintf(buf, "%llu\n", |
5060 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
5061 | } |
5062 | ||
34b13184 AE |
5063 | static ssize_t rbd_features_show(struct device *dev, |
5064 | struct device_attribute *attr, char *buf) | |
5065 | { | |
5066 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5067 | ||
fa58bcad | 5068 | return sprintf(buf, "0x%016llx\n", rbd_dev->header.features); |
34b13184 AE |
5069 | } |
5070 | ||
dfc5606d YS |
5071 | static ssize_t rbd_major_show(struct device *dev, |
5072 | struct device_attribute *attr, char *buf) | |
5073 | { | |
593a9e7b | 5074 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 5075 | |
fc71d833 AE |
5076 | if (rbd_dev->major) |
5077 | return sprintf(buf, "%d\n", rbd_dev->major); | |
5078 | ||
5079 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
5080 | } |
5081 | ||
5082 | static ssize_t rbd_minor_show(struct device *dev, | |
5083 | struct device_attribute *attr, char *buf) | |
5084 | { | |
5085 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 5086 | |
dd82fff1 | 5087 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
5088 | } |
5089 | ||
005a07bf ID |
5090 | static ssize_t rbd_client_addr_show(struct device *dev, |
5091 | struct device_attribute *attr, char *buf) | |
5092 | { | |
5093 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5094 | struct ceph_entity_addr *client_addr = | |
5095 | ceph_client_addr(rbd_dev->rbd_client->client); | |
5096 | ||
5097 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
5098 | le32_to_cpu(client_addr->nonce)); | |
5099 | } | |
5100 | ||
dfc5606d YS |
5101 | static ssize_t rbd_client_id_show(struct device *dev, |
5102 | struct device_attribute *attr, char *buf) | |
602adf40 | 5103 | { |
593a9e7b | 5104 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 5105 | |
1dbb4399 | 5106 | return sprintf(buf, "client%lld\n", |
033268a5 | 5107 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
5108 | } |
5109 | ||
267fb90b MC |
5110 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
5111 | struct device_attribute *attr, char *buf) | |
5112 | { | |
5113 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5114 | ||
5115 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
5116 | } | |
5117 | ||
0d6d1e9c MC |
5118 | static ssize_t rbd_config_info_show(struct device *dev, |
5119 | struct device_attribute *attr, char *buf) | |
5120 | { | |
5121 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5122 | ||
f44d04e6 ID |
5123 | if (!capable(CAP_SYS_ADMIN)) |
5124 | return -EPERM; | |
5125 | ||
0d6d1e9c | 5126 | return sprintf(buf, "%s\n", rbd_dev->config_info); |
602adf40 YS |
5127 | } |
5128 | ||
dfc5606d YS |
5129 | static ssize_t rbd_pool_show(struct device *dev, |
5130 | struct device_attribute *attr, char *buf) | |
602adf40 | 5131 | { |
593a9e7b | 5132 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 5133 | |
0d7dbfce | 5134 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
5135 | } |
5136 | ||
9bb2f334 AE |
5137 | static ssize_t rbd_pool_id_show(struct device *dev, |
5138 | struct device_attribute *attr, char *buf) | |
5139 | { | |
5140 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5141 | ||
0d7dbfce | 5142 | return sprintf(buf, "%llu\n", |
fc71d833 | 5143 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
5144 | } |
5145 | ||
b26c047b ID |
5146 | static ssize_t rbd_pool_ns_show(struct device *dev, |
5147 | struct device_attribute *attr, char *buf) | |
5148 | { | |
5149 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5150 | ||
5151 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_ns ?: ""); | |
5152 | } | |
5153 | ||
dfc5606d YS |
5154 | static ssize_t rbd_name_show(struct device *dev, |
5155 | struct device_attribute *attr, char *buf) | |
5156 | { | |
593a9e7b | 5157 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 5158 | |
a92ffdf8 AE |
5159 | if (rbd_dev->spec->image_name) |
5160 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
5161 | ||
5162 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
5163 | } |
5164 | ||
589d30e0 AE |
5165 | static ssize_t rbd_image_id_show(struct device *dev, |
5166 | struct device_attribute *attr, char *buf) | |
5167 | { | |
5168 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5169 | ||
0d7dbfce | 5170 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
5171 | } |
5172 | ||
34b13184 AE |
5173 | /* |
5174 | * Shows the name of the currently-mapped snapshot (or | |
5175 | * RBD_SNAP_HEAD_NAME for the base image). | |
5176 | */ | |
dfc5606d YS |
5177 | static ssize_t rbd_snap_show(struct device *dev, |
5178 | struct device_attribute *attr, | |
5179 | char *buf) | |
5180 | { | |
593a9e7b | 5181 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 5182 | |
0d7dbfce | 5183 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
5184 | } |
5185 | ||
92a58671 MC |
5186 | static ssize_t rbd_snap_id_show(struct device *dev, |
5187 | struct device_attribute *attr, char *buf) | |
5188 | { | |
5189 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5190 | ||
5191 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
5192 | } | |
5193 | ||
86b00e0d | 5194 | /* |
ff96128f ID |
5195 | * For a v2 image, shows the chain of parent images, separated by empty |
5196 | * lines. For v1 images or if there is no parent, shows "(no parent | |
5197 | * image)". | |
86b00e0d AE |
5198 | */ |
5199 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
5200 | struct device_attribute *attr, |
5201 | char *buf) | |
86b00e0d AE |
5202 | { |
5203 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 5204 | ssize_t count = 0; |
86b00e0d | 5205 | |
ff96128f | 5206 | if (!rbd_dev->parent) |
86b00e0d AE |
5207 | return sprintf(buf, "(no parent image)\n"); |
5208 | ||
ff96128f ID |
5209 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
5210 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
5211 | ||
5212 | count += sprintf(&buf[count], "%s" | |
5213 | "pool_id %llu\npool_name %s\n" | |
e92c0eaf | 5214 | "pool_ns %s\n" |
ff96128f ID |
5215 | "image_id %s\nimage_name %s\n" |
5216 | "snap_id %llu\nsnap_name %s\n" | |
5217 | "overlap %llu\n", | |
5218 | !count ? "" : "\n", /* first? */ | |
5219 | spec->pool_id, spec->pool_name, | |
e92c0eaf | 5220 | spec->pool_ns ?: "", |
ff96128f ID |
5221 | spec->image_id, spec->image_name ?: "(unknown)", |
5222 | spec->snap_id, spec->snap_name, | |
5223 | rbd_dev->parent_overlap); | |
5224 | } | |
5225 | ||
5226 | return count; | |
86b00e0d AE |
5227 | } |
5228 | ||
dfc5606d YS |
5229 | static ssize_t rbd_image_refresh(struct device *dev, |
5230 | struct device_attribute *attr, | |
5231 | const char *buf, | |
5232 | size_t size) | |
5233 | { | |
593a9e7b | 5234 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 5235 | int ret; |
602adf40 | 5236 | |
f44d04e6 ID |
5237 | if (!capable(CAP_SYS_ADMIN)) |
5238 | return -EPERM; | |
5239 | ||
cc4a38bd | 5240 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 5241 | if (ret) |
52bb1f9b | 5242 | return ret; |
b813623a | 5243 | |
52bb1f9b | 5244 | return size; |
dfc5606d | 5245 | } |
602adf40 | 5246 | |
5657a819 JP |
5247 | static DEVICE_ATTR(size, 0444, rbd_size_show, NULL); |
5248 | static DEVICE_ATTR(features, 0444, rbd_features_show, NULL); | |
5249 | static DEVICE_ATTR(major, 0444, rbd_major_show, NULL); | |
5250 | static DEVICE_ATTR(minor, 0444, rbd_minor_show, NULL); | |
5251 | static DEVICE_ATTR(client_addr, 0444, rbd_client_addr_show, NULL); | |
5252 | static DEVICE_ATTR(client_id, 0444, rbd_client_id_show, NULL); | |
5253 | static DEVICE_ATTR(cluster_fsid, 0444, rbd_cluster_fsid_show, NULL); | |
5254 | static DEVICE_ATTR(config_info, 0400, rbd_config_info_show, NULL); | |
5255 | static DEVICE_ATTR(pool, 0444, rbd_pool_show, NULL); | |
5256 | static DEVICE_ATTR(pool_id, 0444, rbd_pool_id_show, NULL); | |
b26c047b | 5257 | static DEVICE_ATTR(pool_ns, 0444, rbd_pool_ns_show, NULL); |
5657a819 JP |
5258 | static DEVICE_ATTR(name, 0444, rbd_name_show, NULL); |
5259 | static DEVICE_ATTR(image_id, 0444, rbd_image_id_show, NULL); | |
5260 | static DEVICE_ATTR(refresh, 0200, NULL, rbd_image_refresh); | |
5261 | static DEVICE_ATTR(current_snap, 0444, rbd_snap_show, NULL); | |
5262 | static DEVICE_ATTR(snap_id, 0444, rbd_snap_id_show, NULL); | |
5263 | static DEVICE_ATTR(parent, 0444, rbd_parent_show, NULL); | |
dfc5606d YS |
5264 | |
5265 | static struct attribute *rbd_attrs[] = { | |
5266 | &dev_attr_size.attr, | |
34b13184 | 5267 | &dev_attr_features.attr, |
dfc5606d | 5268 | &dev_attr_major.attr, |
dd82fff1 | 5269 | &dev_attr_minor.attr, |
005a07bf | 5270 | &dev_attr_client_addr.attr, |
dfc5606d | 5271 | &dev_attr_client_id.attr, |
267fb90b | 5272 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 5273 | &dev_attr_config_info.attr, |
dfc5606d | 5274 | &dev_attr_pool.attr, |
9bb2f334 | 5275 | &dev_attr_pool_id.attr, |
b26c047b | 5276 | &dev_attr_pool_ns.attr, |
dfc5606d | 5277 | &dev_attr_name.attr, |
589d30e0 | 5278 | &dev_attr_image_id.attr, |
dfc5606d | 5279 | &dev_attr_current_snap.attr, |
92a58671 | 5280 | &dev_attr_snap_id.attr, |
86b00e0d | 5281 | &dev_attr_parent.attr, |
dfc5606d | 5282 | &dev_attr_refresh.attr, |
dfc5606d YS |
5283 | NULL |
5284 | }; | |
5285 | ||
5286 | static struct attribute_group rbd_attr_group = { | |
5287 | .attrs = rbd_attrs, | |
5288 | }; | |
5289 | ||
5290 | static const struct attribute_group *rbd_attr_groups[] = { | |
5291 | &rbd_attr_group, | |
5292 | NULL | |
5293 | }; | |
5294 | ||
6cac4695 | 5295 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 5296 | |
b9942bc9 | 5297 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
5298 | .name = "rbd", |
5299 | .groups = rbd_attr_groups, | |
6cac4695 | 5300 | .release = rbd_dev_release, |
dfc5606d YS |
5301 | }; |
5302 | ||
8b8fb99c AE |
5303 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
5304 | { | |
5305 | kref_get(&spec->kref); | |
5306 | ||
5307 | return spec; | |
5308 | } | |
5309 | ||
5310 | static void rbd_spec_free(struct kref *kref); | |
5311 | static void rbd_spec_put(struct rbd_spec *spec) | |
5312 | { | |
5313 | if (spec) | |
5314 | kref_put(&spec->kref, rbd_spec_free); | |
5315 | } | |
5316 | ||
5317 | static struct rbd_spec *rbd_spec_alloc(void) | |
5318 | { | |
5319 | struct rbd_spec *spec; | |
5320 | ||
5321 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
5322 | if (!spec) | |
5323 | return NULL; | |
04077599 ID |
5324 | |
5325 | spec->pool_id = CEPH_NOPOOL; | |
5326 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
5327 | kref_init(&spec->kref); |
5328 | ||
8b8fb99c AE |
5329 | return spec; |
5330 | } | |
5331 | ||
5332 | static void rbd_spec_free(struct kref *kref) | |
5333 | { | |
5334 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
5335 | ||
5336 | kfree(spec->pool_name); | |
b26c047b | 5337 | kfree(spec->pool_ns); |
8b8fb99c AE |
5338 | kfree(spec->image_id); |
5339 | kfree(spec->image_name); | |
5340 | kfree(spec->snap_name); | |
5341 | kfree(spec); | |
5342 | } | |
5343 | ||
1643dfa4 | 5344 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 5345 | { |
99d16943 | 5346 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 5347 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 5348 | |
c41d13a3 | 5349 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 5350 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 5351 | kfree(rbd_dev->config_info); |
c41d13a3 | 5352 | |
dd5ac32d ID |
5353 | rbd_put_client(rbd_dev->rbd_client); |
5354 | rbd_spec_put(rbd_dev->spec); | |
5355 | kfree(rbd_dev->opts); | |
5356 | kfree(rbd_dev); | |
1643dfa4 ID |
5357 | } |
5358 | ||
5359 | static void rbd_dev_release(struct device *dev) | |
5360 | { | |
5361 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
5362 | bool need_put = !!rbd_dev->opts; | |
5363 | ||
5364 | if (need_put) { | |
5365 | destroy_workqueue(rbd_dev->task_wq); | |
5366 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
5367 | } | |
5368 | ||
5369 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
5370 | |
5371 | /* | |
5372 | * This is racy, but way better than putting module outside of | |
5373 | * the release callback. The race window is pretty small, so | |
5374 | * doing something similar to dm (dm-builtin.c) is overkill. | |
5375 | */ | |
5376 | if (need_put) | |
5377 | module_put(THIS_MODULE); | |
5378 | } | |
5379 | ||
1643dfa4 ID |
5380 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
5381 | struct rbd_spec *spec) | |
c53d5893 AE |
5382 | { |
5383 | struct rbd_device *rbd_dev; | |
5384 | ||
1643dfa4 | 5385 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
5386 | if (!rbd_dev) |
5387 | return NULL; | |
5388 | ||
5389 | spin_lock_init(&rbd_dev->lock); | |
5390 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
5391 | init_rwsem(&rbd_dev->header_rwsem); |
5392 | ||
7e97332e | 5393 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 5394 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 5395 | rbd_dev->header_oloc.pool = spec->pool_id; |
b26c047b ID |
5396 | if (spec->pool_ns) { |
5397 | WARN_ON(!*spec->pool_ns); | |
5398 | rbd_dev->header_oloc.pool_ns = | |
5399 | ceph_find_or_create_string(spec->pool_ns, | |
5400 | strlen(spec->pool_ns)); | |
5401 | } | |
c41d13a3 | 5402 | |
99d16943 ID |
5403 | mutex_init(&rbd_dev->watch_mutex); |
5404 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
5405 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
5406 | ||
ed95b21a ID |
5407 | init_rwsem(&rbd_dev->lock_rwsem); |
5408 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
5409 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
5410 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
5411 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
5412 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
e1fddc8f | 5413 | spin_lock_init(&rbd_dev->lock_lists_lock); |
637cd060 | 5414 | INIT_LIST_HEAD(&rbd_dev->acquiring_list); |
e1fddc8f | 5415 | INIT_LIST_HEAD(&rbd_dev->running_list); |
637cd060 | 5416 | init_completion(&rbd_dev->acquire_wait); |
e1fddc8f | 5417 | init_completion(&rbd_dev->releasing_wait); |
ed95b21a | 5418 | |
22e8bd51 | 5419 | spin_lock_init(&rbd_dev->object_map_lock); |
ed95b21a | 5420 | |
dd5ac32d ID |
5421 | rbd_dev->dev.bus = &rbd_bus_type; |
5422 | rbd_dev->dev.type = &rbd_device_type; | |
5423 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
5424 | device_initialize(&rbd_dev->dev); |
5425 | ||
c53d5893 | 5426 | rbd_dev->rbd_client = rbdc; |
d147543d | 5427 | rbd_dev->spec = spec; |
0903e875 | 5428 | |
1643dfa4 ID |
5429 | return rbd_dev; |
5430 | } | |
5431 | ||
5432 | /* | |
5433 | * Create a mapping rbd_dev. | |
5434 | */ | |
5435 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
5436 | struct rbd_spec *spec, | |
5437 | struct rbd_options *opts) | |
5438 | { | |
5439 | struct rbd_device *rbd_dev; | |
5440 | ||
5441 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
5442 | if (!rbd_dev) | |
5443 | return NULL; | |
5444 | ||
5445 | rbd_dev->opts = opts; | |
5446 | ||
5447 | /* get an id and fill in device name */ | |
5448 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
5449 | minor_to_rbd_dev_id(1 << MINORBITS), | |
5450 | GFP_KERNEL); | |
5451 | if (rbd_dev->dev_id < 0) | |
5452 | goto fail_rbd_dev; | |
5453 | ||
5454 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
5455 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
5456 | rbd_dev->name); | |
5457 | if (!rbd_dev->task_wq) | |
5458 | goto fail_dev_id; | |
dd5ac32d | 5459 | |
1643dfa4 ID |
5460 | /* we have a ref from do_rbd_add() */ |
5461 | __module_get(THIS_MODULE); | |
dd5ac32d | 5462 | |
1643dfa4 | 5463 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 5464 | return rbd_dev; |
1643dfa4 ID |
5465 | |
5466 | fail_dev_id: | |
5467 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
5468 | fail_rbd_dev: | |
5469 | rbd_dev_free(rbd_dev); | |
5470 | return NULL; | |
c53d5893 AE |
5471 | } |
5472 | ||
5473 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
5474 | { | |
dd5ac32d ID |
5475 | if (rbd_dev) |
5476 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
5477 | } |
5478 | ||
9d475de5 AE |
5479 | /* |
5480 | * Get the size and object order for an image snapshot, or if | |
5481 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
5482 | * image. | |
5483 | */ | |
5484 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
5485 | u8 *order, u64 *snap_size) | |
5486 | { | |
5487 | __le64 snapid = cpu_to_le64(snap_id); | |
5488 | int ret; | |
5489 | struct { | |
5490 | u8 order; | |
5491 | __le64 size; | |
5492 | } __attribute__ ((packed)) size_buf = { 0 }; | |
5493 | ||
ecd4a68a ID |
5494 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5495 | &rbd_dev->header_oloc, "get_size", | |
5496 | &snapid, sizeof(snapid), | |
5497 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 5498 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
5499 | if (ret < 0) |
5500 | return ret; | |
57385b51 AE |
5501 | if (ret < sizeof (size_buf)) |
5502 | return -ERANGE; | |
9d475de5 | 5503 | |
c3545579 | 5504 | if (order) { |
c86f86e9 | 5505 | *order = size_buf.order; |
c3545579 JD |
5506 | dout(" order %u", (unsigned int)*order); |
5507 | } | |
9d475de5 AE |
5508 | *snap_size = le64_to_cpu(size_buf.size); |
5509 | ||
c3545579 JD |
5510 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
5511 | (unsigned long long)snap_id, | |
57385b51 | 5512 | (unsigned long long)*snap_size); |
9d475de5 AE |
5513 | |
5514 | return 0; | |
5515 | } | |
5516 | ||
5517 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
5518 | { | |
5519 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
5520 | &rbd_dev->header.obj_order, | |
5521 | &rbd_dev->header.image_size); | |
5522 | } | |
5523 | ||
1e130199 AE |
5524 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
5525 | { | |
5435d206 | 5526 | size_t size; |
1e130199 AE |
5527 | void *reply_buf; |
5528 | int ret; | |
5529 | void *p; | |
5530 | ||
5435d206 DY |
5531 | /* Response will be an encoded string, which includes a length */ |
5532 | size = sizeof(__le32) + RBD_OBJ_PREFIX_LEN_MAX; | |
5533 | reply_buf = kzalloc(size, GFP_KERNEL); | |
1e130199 AE |
5534 | if (!reply_buf) |
5535 | return -ENOMEM; | |
5536 | ||
ecd4a68a ID |
5537 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5538 | &rbd_dev->header_oloc, "get_object_prefix", | |
5435d206 | 5539 | NULL, 0, reply_buf, size); |
36be9a76 | 5540 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
5541 | if (ret < 0) |
5542 | goto out; | |
5543 | ||
5544 | p = reply_buf; | |
5545 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
5546 | p + ret, NULL, GFP_NOIO); |
5547 | ret = 0; | |
1e130199 AE |
5548 | |
5549 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
5550 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
5551 | rbd_dev->header.object_prefix = NULL; | |
5552 | } else { | |
5553 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
5554 | } | |
1e130199 AE |
5555 | out: |
5556 | kfree(reply_buf); | |
5557 | ||
5558 | return ret; | |
5559 | } | |
5560 | ||
b1b5402a | 5561 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
196e2d6d | 5562 | bool read_only, u64 *snap_features) |
b1b5402a | 5563 | { |
196e2d6d ID |
5564 | struct { |
5565 | __le64 snap_id; | |
5566 | u8 read_only; | |
5567 | } features_in; | |
b1b5402a AE |
5568 | struct { |
5569 | __le64 features; | |
5570 | __le64 incompat; | |
4157976b | 5571 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 5572 | u64 unsup; |
b1b5402a AE |
5573 | int ret; |
5574 | ||
196e2d6d ID |
5575 | features_in.snap_id = cpu_to_le64(snap_id); |
5576 | features_in.read_only = read_only; | |
5577 | ||
ecd4a68a ID |
5578 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5579 | &rbd_dev->header_oloc, "get_features", | |
196e2d6d | 5580 | &features_in, sizeof(features_in), |
ecd4a68a | 5581 | &features_buf, sizeof(features_buf)); |
36be9a76 | 5582 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
5583 | if (ret < 0) |
5584 | return ret; | |
57385b51 AE |
5585 | if (ret < sizeof (features_buf)) |
5586 | return -ERANGE; | |
d889140c | 5587 | |
d3767f0f ID |
5588 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
5589 | if (unsup) { | |
5590 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
5591 | unsup); | |
b8f5c6ed | 5592 | return -ENXIO; |
d3767f0f | 5593 | } |
d889140c | 5594 | |
b1b5402a AE |
5595 | *snap_features = le64_to_cpu(features_buf.features); |
5596 | ||
5597 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
5598 | (unsigned long long)snap_id, |
5599 | (unsigned long long)*snap_features, | |
5600 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
5601 | |
5602 | return 0; | |
5603 | } | |
5604 | ||
5605 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
5606 | { | |
5607 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
196e2d6d ID |
5608 | rbd_is_ro(rbd_dev), |
5609 | &rbd_dev->header.features); | |
b1b5402a AE |
5610 | } |
5611 | ||
22e8bd51 ID |
5612 | /* |
5613 | * These are generic image flags, but since they are used only for | |
5614 | * object map, store them in rbd_dev->object_map_flags. | |
5615 | * | |
5616 | * For the same reason, this function is called only on object map | |
5617 | * (re)load and not on header refresh. | |
5618 | */ | |
5619 | static int rbd_dev_v2_get_flags(struct rbd_device *rbd_dev) | |
5620 | { | |
5621 | __le64 snapid = cpu_to_le64(rbd_dev->spec->snap_id); | |
5622 | __le64 flags; | |
5623 | int ret; | |
5624 | ||
5625 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
5626 | &rbd_dev->header_oloc, "get_flags", | |
5627 | &snapid, sizeof(snapid), | |
5628 | &flags, sizeof(flags)); | |
5629 | if (ret < 0) | |
5630 | return ret; | |
5631 | if (ret < sizeof(flags)) | |
5632 | return -EBADMSG; | |
5633 | ||
5634 | rbd_dev->object_map_flags = le64_to_cpu(flags); | |
5635 | return 0; | |
5636 | } | |
5637 | ||
eb3b2d6b ID |
5638 | struct parent_image_info { |
5639 | u64 pool_id; | |
e92c0eaf | 5640 | const char *pool_ns; |
eb3b2d6b ID |
5641 | const char *image_id; |
5642 | u64 snap_id; | |
5643 | ||
e92c0eaf | 5644 | bool has_overlap; |
eb3b2d6b ID |
5645 | u64 overlap; |
5646 | }; | |
5647 | ||
e92c0eaf ID |
5648 | /* |
5649 | * The caller is responsible for @pii. | |
5650 | */ | |
5651 | static int decode_parent_image_spec(void **p, void *end, | |
5652 | struct parent_image_info *pii) | |
5653 | { | |
5654 | u8 struct_v; | |
5655 | u32 struct_len; | |
5656 | int ret; | |
5657 | ||
5658 | ret = ceph_start_decoding(p, end, 1, "ParentImageSpec", | |
5659 | &struct_v, &struct_len); | |
5660 | if (ret) | |
5661 | return ret; | |
5662 | ||
5663 | ceph_decode_64_safe(p, end, pii->pool_id, e_inval); | |
5664 | pii->pool_ns = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
5665 | if (IS_ERR(pii->pool_ns)) { | |
5666 | ret = PTR_ERR(pii->pool_ns); | |
5667 | pii->pool_ns = NULL; | |
5668 | return ret; | |
5669 | } | |
5670 | pii->image_id = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
5671 | if (IS_ERR(pii->image_id)) { | |
5672 | ret = PTR_ERR(pii->image_id); | |
5673 | pii->image_id = NULL; | |
5674 | return ret; | |
5675 | } | |
5676 | ceph_decode_64_safe(p, end, pii->snap_id, e_inval); | |
5677 | return 0; | |
5678 | ||
5679 | e_inval: | |
5680 | return -EINVAL; | |
5681 | } | |
5682 | ||
5683 | static int __get_parent_info(struct rbd_device *rbd_dev, | |
5684 | struct page *req_page, | |
5685 | struct page *reply_page, | |
5686 | struct parent_image_info *pii) | |
5687 | { | |
5688 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
5689 | size_t reply_len = PAGE_SIZE; | |
5690 | void *p, *end; | |
5691 | int ret; | |
5692 | ||
5693 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
5694 | "rbd", "parent_get", CEPH_OSD_FLAG_READ, | |
68ada915 | 5695 | req_page, sizeof(u64), &reply_page, &reply_len); |
e92c0eaf ID |
5696 | if (ret) |
5697 | return ret == -EOPNOTSUPP ? 1 : ret; | |
5698 | ||
5699 | p = page_address(reply_page); | |
5700 | end = p + reply_len; | |
5701 | ret = decode_parent_image_spec(&p, end, pii); | |
5702 | if (ret) | |
5703 | return ret; | |
5704 | ||
5705 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
5706 | "rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ, | |
68ada915 | 5707 | req_page, sizeof(u64), &reply_page, &reply_len); |
e92c0eaf ID |
5708 | if (ret) |
5709 | return ret; | |
5710 | ||
5711 | p = page_address(reply_page); | |
5712 | end = p + reply_len; | |
5713 | ceph_decode_8_safe(&p, end, pii->has_overlap, e_inval); | |
5714 | if (pii->has_overlap) | |
5715 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); | |
5716 | ||
5717 | return 0; | |
5718 | ||
5719 | e_inval: | |
5720 | return -EINVAL; | |
5721 | } | |
5722 | ||
eb3b2d6b ID |
5723 | /* |
5724 | * The caller is responsible for @pii. | |
5725 | */ | |
5726 | static int __get_parent_info_legacy(struct rbd_device *rbd_dev, | |
5727 | struct page *req_page, | |
5728 | struct page *reply_page, | |
5729 | struct parent_image_info *pii) | |
5730 | { | |
5731 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
5732 | size_t reply_len = PAGE_SIZE; | |
5733 | void *p, *end; | |
5734 | int ret; | |
5735 | ||
5736 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
5737 | "rbd", "get_parent", CEPH_OSD_FLAG_READ, | |
68ada915 | 5738 | req_page, sizeof(u64), &reply_page, &reply_len); |
eb3b2d6b ID |
5739 | if (ret) |
5740 | return ret; | |
5741 | ||
5742 | p = page_address(reply_page); | |
5743 | end = p + reply_len; | |
5744 | ceph_decode_64_safe(&p, end, pii->pool_id, e_inval); | |
5745 | pii->image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); | |
5746 | if (IS_ERR(pii->image_id)) { | |
5747 | ret = PTR_ERR(pii->image_id); | |
5748 | pii->image_id = NULL; | |
5749 | return ret; | |
5750 | } | |
5751 | ceph_decode_64_safe(&p, end, pii->snap_id, e_inval); | |
e92c0eaf | 5752 | pii->has_overlap = true; |
eb3b2d6b ID |
5753 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
5754 | ||
5755 | return 0; | |
5756 | ||
5757 | e_inval: | |
5758 | return -EINVAL; | |
5759 | } | |
5760 | ||
5761 | static int get_parent_info(struct rbd_device *rbd_dev, | |
5762 | struct parent_image_info *pii) | |
5763 | { | |
5764 | struct page *req_page, *reply_page; | |
5765 | void *p; | |
5766 | int ret; | |
5767 | ||
5768 | req_page = alloc_page(GFP_KERNEL); | |
5769 | if (!req_page) | |
5770 | return -ENOMEM; | |
5771 | ||
5772 | reply_page = alloc_page(GFP_KERNEL); | |
5773 | if (!reply_page) { | |
5774 | __free_page(req_page); | |
5775 | return -ENOMEM; | |
5776 | } | |
5777 | ||
5778 | p = page_address(req_page); | |
5779 | ceph_encode_64(&p, rbd_dev->spec->snap_id); | |
e92c0eaf ID |
5780 | ret = __get_parent_info(rbd_dev, req_page, reply_page, pii); |
5781 | if (ret > 0) | |
5782 | ret = __get_parent_info_legacy(rbd_dev, req_page, reply_page, | |
5783 | pii); | |
eb3b2d6b ID |
5784 | |
5785 | __free_page(req_page); | |
5786 | __free_page(reply_page); | |
5787 | return ret; | |
5788 | } | |
5789 | ||
86b00e0d AE |
5790 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
5791 | { | |
5792 | struct rbd_spec *parent_spec; | |
eb3b2d6b | 5793 | struct parent_image_info pii = { 0 }; |
86b00e0d AE |
5794 | int ret; |
5795 | ||
5796 | parent_spec = rbd_spec_alloc(); | |
5797 | if (!parent_spec) | |
5798 | return -ENOMEM; | |
5799 | ||
eb3b2d6b ID |
5800 | ret = get_parent_info(rbd_dev, &pii); |
5801 | if (ret) | |
86b00e0d | 5802 | goto out_err; |
86b00e0d | 5803 | |
e92c0eaf ID |
5804 | dout("%s pool_id %llu pool_ns %s image_id %s snap_id %llu has_overlap %d overlap %llu\n", |
5805 | __func__, pii.pool_id, pii.pool_ns, pii.image_id, pii.snap_id, | |
5806 | pii.has_overlap, pii.overlap); | |
86b00e0d | 5807 | |
e92c0eaf | 5808 | if (pii.pool_id == CEPH_NOPOOL || !pii.has_overlap) { |
392a9dad AE |
5809 | /* |
5810 | * Either the parent never existed, or we have | |
5811 | * record of it but the image got flattened so it no | |
5812 | * longer has a parent. When the parent of a | |
5813 | * layered image disappears we immediately set the | |
5814 | * overlap to 0. The effect of this is that all new | |
5815 | * requests will be treated as if the image had no | |
5816 | * parent. | |
e92c0eaf ID |
5817 | * |
5818 | * If !pii.has_overlap, the parent image spec is not | |
5819 | * applicable. It's there to avoid duplication in each | |
5820 | * snapshot record. | |
392a9dad AE |
5821 | */ |
5822 | if (rbd_dev->parent_overlap) { | |
5823 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
5824 | rbd_dev_parent_put(rbd_dev); |
5825 | pr_info("%s: clone image has been flattened\n", | |
5826 | rbd_dev->disk->disk_name); | |
5827 | } | |
5828 | ||
86b00e0d | 5829 | goto out; /* No parent? No problem. */ |
392a9dad | 5830 | } |
86b00e0d | 5831 | |
0903e875 AE |
5832 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5833 | ||
5834 | ret = -EIO; | |
eb3b2d6b | 5835 | if (pii.pool_id > (u64)U32_MAX) { |
9584d508 | 5836 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
eb3b2d6b | 5837 | (unsigned long long)pii.pool_id, U32_MAX); |
86b00e0d AE |
5838 | goto out_err; |
5839 | } | |
86b00e0d | 5840 | |
3b5cf2a2 AE |
5841 | /* |
5842 | * The parent won't change (except when the clone is | |
5843 | * flattened, already handled that). So we only need to | |
5844 | * record the parent spec we have not already done so. | |
5845 | */ | |
5846 | if (!rbd_dev->parent_spec) { | |
eb3b2d6b | 5847 | parent_spec->pool_id = pii.pool_id; |
e92c0eaf ID |
5848 | if (pii.pool_ns && *pii.pool_ns) { |
5849 | parent_spec->pool_ns = pii.pool_ns; | |
5850 | pii.pool_ns = NULL; | |
5851 | } | |
eb3b2d6b ID |
5852 | parent_spec->image_id = pii.image_id; |
5853 | pii.image_id = NULL; | |
5854 | parent_spec->snap_id = pii.snap_id; | |
b26c047b | 5855 | |
70cf49cf AE |
5856 | rbd_dev->parent_spec = parent_spec; |
5857 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3b5cf2a2 AE |
5858 | } |
5859 | ||
5860 | /* | |
cf32bd9c ID |
5861 | * We always update the parent overlap. If it's zero we issue |
5862 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 5863 | */ |
eb3b2d6b | 5864 | if (!pii.overlap) { |
3b5cf2a2 | 5865 | if (parent_spec) { |
cf32bd9c ID |
5866 | /* refresh, careful to warn just once */ |
5867 | if (rbd_dev->parent_overlap) | |
5868 | rbd_warn(rbd_dev, | |
5869 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 5870 | } else { |
cf32bd9c ID |
5871 | /* initial probe */ |
5872 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 5873 | } |
70cf49cf | 5874 | } |
eb3b2d6b | 5875 | rbd_dev->parent_overlap = pii.overlap; |
cf32bd9c | 5876 | |
86b00e0d AE |
5877 | out: |
5878 | ret = 0; | |
5879 | out_err: | |
e92c0eaf | 5880 | kfree(pii.pool_ns); |
eb3b2d6b | 5881 | kfree(pii.image_id); |
86b00e0d | 5882 | rbd_spec_put(parent_spec); |
86b00e0d AE |
5883 | return ret; |
5884 | } | |
5885 | ||
cc070d59 AE |
5886 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
5887 | { | |
5888 | struct { | |
5889 | __le64 stripe_unit; | |
5890 | __le64 stripe_count; | |
5891 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
5892 | size_t size = sizeof (striping_info_buf); | |
5893 | void *p; | |
cc070d59 AE |
5894 | int ret; |
5895 | ||
ecd4a68a ID |
5896 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5897 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
5898 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
5899 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
5900 | if (ret < 0) | |
5901 | return ret; | |
5902 | if (ret < size) | |
5903 | return -ERANGE; | |
5904 | ||
cc070d59 | 5905 | p = &striping_info_buf; |
b1331852 ID |
5906 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
5907 | rbd_dev->header.stripe_count = ceph_decode_64(&p); | |
cc070d59 AE |
5908 | return 0; |
5909 | } | |
5910 | ||
7e97332e ID |
5911 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
5912 | { | |
5913 | __le64 data_pool_id; | |
5914 | int ret; | |
5915 | ||
5916 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
5917 | &rbd_dev->header_oloc, "get_data_pool", | |
5918 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
5919 | if (ret < 0) | |
5920 | return ret; | |
5921 | if (ret < sizeof(data_pool_id)) | |
5922 | return -EBADMSG; | |
5923 | ||
5924 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
5925 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
5926 | return 0; | |
5927 | } | |
5928 | ||
9e15b77d AE |
5929 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
5930 | { | |
ecd4a68a | 5931 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
5932 | size_t image_id_size; |
5933 | char *image_id; | |
5934 | void *p; | |
5935 | void *end; | |
5936 | size_t size; | |
5937 | void *reply_buf = NULL; | |
5938 | size_t len = 0; | |
5939 | char *image_name = NULL; | |
5940 | int ret; | |
5941 | ||
5942 | rbd_assert(!rbd_dev->spec->image_name); | |
5943 | ||
69e7a02f AE |
5944 | len = strlen(rbd_dev->spec->image_id); |
5945 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
5946 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
5947 | if (!image_id) | |
5948 | return NULL; | |
5949 | ||
5950 | p = image_id; | |
4157976b | 5951 | end = image_id + image_id_size; |
57385b51 | 5952 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
5953 | |
5954 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
5955 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5956 | if (!reply_buf) | |
5957 | goto out; | |
5958 | ||
ecd4a68a ID |
5959 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
5960 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
5961 | "dir_get_name", image_id, image_id_size, | |
5962 | reply_buf, size); | |
9e15b77d AE |
5963 | if (ret < 0) |
5964 | goto out; | |
5965 | p = reply_buf; | |
f40eb349 AE |
5966 | end = reply_buf + ret; |
5967 | ||
9e15b77d AE |
5968 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
5969 | if (IS_ERR(image_name)) | |
5970 | image_name = NULL; | |
5971 | else | |
5972 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
5973 | out: | |
5974 | kfree(reply_buf); | |
5975 | kfree(image_id); | |
5976 | ||
5977 | return image_name; | |
5978 | } | |
5979 | ||
2ad3d716 AE |
5980 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
5981 | { | |
5982 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5983 | const char *snap_name; | |
5984 | u32 which = 0; | |
5985 | ||
5986 | /* Skip over names until we find the one we are looking for */ | |
5987 | ||
5988 | snap_name = rbd_dev->header.snap_names; | |
5989 | while (which < snapc->num_snaps) { | |
5990 | if (!strcmp(name, snap_name)) | |
5991 | return snapc->snaps[which]; | |
5992 | snap_name += strlen(snap_name) + 1; | |
5993 | which++; | |
5994 | } | |
5995 | return CEPH_NOSNAP; | |
5996 | } | |
5997 | ||
5998 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5999 | { | |
6000 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
6001 | u32 which; | |
6002 | bool found = false; | |
6003 | u64 snap_id; | |
6004 | ||
6005 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
6006 | const char *snap_name; | |
6007 | ||
6008 | snap_id = snapc->snaps[which]; | |
6009 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
6010 | if (IS_ERR(snap_name)) { |
6011 | /* ignore no-longer existing snapshots */ | |
6012 | if (PTR_ERR(snap_name) == -ENOENT) | |
6013 | continue; | |
6014 | else | |
6015 | break; | |
6016 | } | |
2ad3d716 AE |
6017 | found = !strcmp(name, snap_name); |
6018 | kfree(snap_name); | |
6019 | } | |
6020 | return found ? snap_id : CEPH_NOSNAP; | |
6021 | } | |
6022 | ||
6023 | /* | |
6024 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
6025 | * no snapshot by that name is found, or if an error occurs. | |
6026 | */ | |
6027 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
6028 | { | |
6029 | if (rbd_dev->image_format == 1) | |
6030 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
6031 | ||
6032 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
6033 | } | |
6034 | ||
9e15b77d | 6035 | /* |
04077599 ID |
6036 | * An image being mapped will have everything but the snap id. |
6037 | */ | |
6038 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
6039 | { | |
6040 | struct rbd_spec *spec = rbd_dev->spec; | |
6041 | ||
6042 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
6043 | rbd_assert(spec->image_id && spec->image_name); | |
6044 | rbd_assert(spec->snap_name); | |
6045 | ||
6046 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
6047 | u64 snap_id; | |
6048 | ||
6049 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
6050 | if (snap_id == CEPH_NOSNAP) | |
6051 | return -ENOENT; | |
6052 | ||
6053 | spec->snap_id = snap_id; | |
6054 | } else { | |
6055 | spec->snap_id = CEPH_NOSNAP; | |
6056 | } | |
6057 | ||
6058 | return 0; | |
6059 | } | |
6060 | ||
6061 | /* | |
6062 | * A parent image will have all ids but none of the names. | |
e1d4213f | 6063 | * |
04077599 ID |
6064 | * All names in an rbd spec are dynamically allocated. It's OK if we |
6065 | * can't figure out the name for an image id. | |
9e15b77d | 6066 | */ |
04077599 | 6067 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 6068 | { |
2e9f7f1c AE |
6069 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
6070 | struct rbd_spec *spec = rbd_dev->spec; | |
6071 | const char *pool_name; | |
6072 | const char *image_name; | |
6073 | const char *snap_name; | |
9e15b77d AE |
6074 | int ret; |
6075 | ||
04077599 ID |
6076 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
6077 | rbd_assert(spec->image_id); | |
6078 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 6079 | |
2e9f7f1c | 6080 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 6081 | |
2e9f7f1c AE |
6082 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
6083 | if (!pool_name) { | |
6084 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
6085 | return -EIO; |
6086 | } | |
2e9f7f1c AE |
6087 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
6088 | if (!pool_name) | |
9e15b77d AE |
6089 | return -ENOMEM; |
6090 | ||
6091 | /* Fetch the image name; tolerate failure here */ | |
6092 | ||
2e9f7f1c AE |
6093 | image_name = rbd_dev_image_name(rbd_dev); |
6094 | if (!image_name) | |
06ecc6cb | 6095 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 6096 | |
04077599 | 6097 | /* Fetch the snapshot name */ |
9e15b77d | 6098 | |
2e9f7f1c | 6099 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
6100 | if (IS_ERR(snap_name)) { |
6101 | ret = PTR_ERR(snap_name); | |
9e15b77d | 6102 | goto out_err; |
2e9f7f1c AE |
6103 | } |
6104 | ||
6105 | spec->pool_name = pool_name; | |
6106 | spec->image_name = image_name; | |
6107 | spec->snap_name = snap_name; | |
9e15b77d AE |
6108 | |
6109 | return 0; | |
04077599 | 6110 | |
9e15b77d | 6111 | out_err: |
2e9f7f1c AE |
6112 | kfree(image_name); |
6113 | kfree(pool_name); | |
9e15b77d AE |
6114 | return ret; |
6115 | } | |
6116 | ||
cc4a38bd | 6117 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
6118 | { |
6119 | size_t size; | |
6120 | int ret; | |
6121 | void *reply_buf; | |
6122 | void *p; | |
6123 | void *end; | |
6124 | u64 seq; | |
6125 | u32 snap_count; | |
6126 | struct ceph_snap_context *snapc; | |
6127 | u32 i; | |
6128 | ||
6129 | /* | |
6130 | * We'll need room for the seq value (maximum snapshot id), | |
6131 | * snapshot count, and array of that many snapshot ids. | |
6132 | * For now we have a fixed upper limit on the number we're | |
6133 | * prepared to receive. | |
6134 | */ | |
6135 | size = sizeof (__le64) + sizeof (__le32) + | |
6136 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
6137 | reply_buf = kzalloc(size, GFP_KERNEL); | |
6138 | if (!reply_buf) | |
6139 | return -ENOMEM; | |
6140 | ||
ecd4a68a ID |
6141 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
6142 | &rbd_dev->header_oloc, "get_snapcontext", | |
6143 | NULL, 0, reply_buf, size); | |
36be9a76 | 6144 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
6145 | if (ret < 0) |
6146 | goto out; | |
6147 | ||
35d489f9 | 6148 | p = reply_buf; |
57385b51 AE |
6149 | end = reply_buf + ret; |
6150 | ret = -ERANGE; | |
35d489f9 AE |
6151 | ceph_decode_64_safe(&p, end, seq, out); |
6152 | ceph_decode_32_safe(&p, end, snap_count, out); | |
6153 | ||
6154 | /* | |
6155 | * Make sure the reported number of snapshot ids wouldn't go | |
6156 | * beyond the end of our buffer. But before checking that, | |
6157 | * make sure the computed size of the snapshot context we | |
6158 | * allocate is representable in a size_t. | |
6159 | */ | |
6160 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
6161 | / sizeof (u64)) { | |
6162 | ret = -EINVAL; | |
6163 | goto out; | |
6164 | } | |
6165 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
6166 | goto out; | |
468521c1 | 6167 | ret = 0; |
35d489f9 | 6168 | |
812164f8 | 6169 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
6170 | if (!snapc) { |
6171 | ret = -ENOMEM; | |
6172 | goto out; | |
6173 | } | |
35d489f9 | 6174 | snapc->seq = seq; |
35d489f9 AE |
6175 | for (i = 0; i < snap_count; i++) |
6176 | snapc->snaps[i] = ceph_decode_64(&p); | |
6177 | ||
49ece554 | 6178 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
6179 | rbd_dev->header.snapc = snapc; |
6180 | ||
6181 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 6182 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
6183 | out: |
6184 | kfree(reply_buf); | |
6185 | ||
57385b51 | 6186 | return ret; |
35d489f9 AE |
6187 | } |
6188 | ||
54cac61f AE |
6189 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
6190 | u64 snap_id) | |
b8b1e2db AE |
6191 | { |
6192 | size_t size; | |
6193 | void *reply_buf; | |
54cac61f | 6194 | __le64 snapid; |
b8b1e2db AE |
6195 | int ret; |
6196 | void *p; | |
6197 | void *end; | |
b8b1e2db AE |
6198 | char *snap_name; |
6199 | ||
6200 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
6201 | reply_buf = kmalloc(size, GFP_KERNEL); | |
6202 | if (!reply_buf) | |
6203 | return ERR_PTR(-ENOMEM); | |
6204 | ||
54cac61f | 6205 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
6206 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
6207 | &rbd_dev->header_oloc, "get_snapshot_name", | |
6208 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 6209 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
6210 | if (ret < 0) { |
6211 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 6212 | goto out; |
f40eb349 | 6213 | } |
b8b1e2db AE |
6214 | |
6215 | p = reply_buf; | |
f40eb349 | 6216 | end = reply_buf + ret; |
e5c35534 | 6217 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 6218 | if (IS_ERR(snap_name)) |
b8b1e2db | 6219 | goto out; |
b8b1e2db | 6220 | |
f40eb349 | 6221 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 6222 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
6223 | out: |
6224 | kfree(reply_buf); | |
6225 | ||
f40eb349 | 6226 | return snap_name; |
b8b1e2db AE |
6227 | } |
6228 | ||
2df3fac7 | 6229 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 6230 | { |
2df3fac7 | 6231 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 6232 | int ret; |
117973fb | 6233 | |
1617e40c JD |
6234 | ret = rbd_dev_v2_image_size(rbd_dev); |
6235 | if (ret) | |
cfbf6377 | 6236 | return ret; |
1617e40c | 6237 | |
2df3fac7 AE |
6238 | if (first_time) { |
6239 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
6240 | if (ret) | |
cfbf6377 | 6241 | return ret; |
2df3fac7 AE |
6242 | } |
6243 | ||
cc4a38bd | 6244 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
6245 | if (ret && first_time) { |
6246 | kfree(rbd_dev->header.object_prefix); | |
6247 | rbd_dev->header.object_prefix = NULL; | |
6248 | } | |
117973fb AE |
6249 | |
6250 | return ret; | |
6251 | } | |
6252 | ||
a720ae09 ID |
6253 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
6254 | { | |
6255 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
6256 | ||
6257 | if (rbd_dev->image_format == 1) | |
6258 | return rbd_dev_v1_header_info(rbd_dev); | |
6259 | ||
6260 | return rbd_dev_v2_header_info(rbd_dev); | |
6261 | } | |
6262 | ||
e28fff26 AE |
6263 | /* |
6264 | * Skips over white space at *buf, and updates *buf to point to the | |
6265 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
6266 | * the token (string of non-white space characters) found. Note |
6267 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
6268 | */ |
6269 | static inline size_t next_token(const char **buf) | |
6270 | { | |
6271 | /* | |
6272 | * These are the characters that produce nonzero for | |
6273 | * isspace() in the "C" and "POSIX" locales. | |
6274 | */ | |
6275 | const char *spaces = " \f\n\r\t\v"; | |
6276 | ||
6277 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
6278 | ||
6279 | return strcspn(*buf, spaces); /* Return token length */ | |
6280 | } | |
6281 | ||
ea3352f4 AE |
6282 | /* |
6283 | * Finds the next token in *buf, dynamically allocates a buffer big | |
6284 | * enough to hold a copy of it, and copies the token into the new | |
6285 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
6286 | * that a duplicate buffer is created even for a zero-length token. | |
6287 | * | |
6288 | * Returns a pointer to the newly-allocated duplicate, or a null | |
6289 | * pointer if memory for the duplicate was not available. If | |
6290 | * the lenp argument is a non-null pointer, the length of the token | |
6291 | * (not including the '\0') is returned in *lenp. | |
6292 | * | |
6293 | * If successful, the *buf pointer will be updated to point beyond | |
6294 | * the end of the found token. | |
6295 | * | |
6296 | * Note: uses GFP_KERNEL for allocation. | |
6297 | */ | |
6298 | static inline char *dup_token(const char **buf, size_t *lenp) | |
6299 | { | |
6300 | char *dup; | |
6301 | size_t len; | |
6302 | ||
6303 | len = next_token(buf); | |
4caf35f9 | 6304 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
6305 | if (!dup) |
6306 | return NULL; | |
ea3352f4 AE |
6307 | *(dup + len) = '\0'; |
6308 | *buf += len; | |
6309 | ||
6310 | if (lenp) | |
6311 | *lenp = len; | |
6312 | ||
6313 | return dup; | |
6314 | } | |
6315 | ||
82995cc6 DH |
6316 | static int rbd_parse_param(struct fs_parameter *param, |
6317 | struct rbd_parse_opts_ctx *pctx) | |
6318 | { | |
6319 | struct rbd_options *opt = pctx->opts; | |
6320 | struct fs_parse_result result; | |
3fbb8d55 | 6321 | struct p_log log = {.prefix = "rbd"}; |
82995cc6 DH |
6322 | int token, ret; |
6323 | ||
6324 | ret = ceph_parse_param(param, pctx->copts, NULL); | |
6325 | if (ret != -ENOPARAM) | |
6326 | return ret; | |
6327 | ||
d7167b14 | 6328 | token = __fs_parse(&log, rbd_parameters, param, &result); |
82995cc6 DH |
6329 | dout("%s fs_parse '%s' token %d\n", __func__, param->key, token); |
6330 | if (token < 0) { | |
2c3f3dc3 AV |
6331 | if (token == -ENOPARAM) |
6332 | return inval_plog(&log, "Unknown parameter '%s'", | |
6333 | param->key); | |
82995cc6 DH |
6334 | return token; |
6335 | } | |
6336 | ||
6337 | switch (token) { | |
6338 | case Opt_queue_depth: | |
6339 | if (result.uint_32 < 1) | |
6340 | goto out_of_range; | |
6341 | opt->queue_depth = result.uint_32; | |
6342 | break; | |
6343 | case Opt_alloc_size: | |
6344 | if (result.uint_32 < SECTOR_SIZE) | |
6345 | goto out_of_range; | |
2c3f3dc3 AV |
6346 | if (!is_power_of_2(result.uint_32)) |
6347 | return inval_plog(&log, "alloc_size must be a power of 2"); | |
82995cc6 DH |
6348 | opt->alloc_size = result.uint_32; |
6349 | break; | |
6350 | case Opt_lock_timeout: | |
6351 | /* 0 is "wait forever" (i.e. infinite timeout) */ | |
6352 | if (result.uint_32 > INT_MAX / 1000) | |
6353 | goto out_of_range; | |
6354 | opt->lock_timeout = msecs_to_jiffies(result.uint_32 * 1000); | |
6355 | break; | |
6356 | case Opt_pool_ns: | |
6357 | kfree(pctx->spec->pool_ns); | |
6358 | pctx->spec->pool_ns = param->string; | |
6359 | param->string = NULL; | |
6360 | break; | |
dc1dad8e ID |
6361 | case Opt_compression_hint: |
6362 | switch (result.uint_32) { | |
6363 | case Opt_compression_hint_none: | |
6364 | opt->alloc_hint_flags &= | |
6365 | ~(CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE | | |
6366 | CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE); | |
6367 | break; | |
6368 | case Opt_compression_hint_compressible: | |
6369 | opt->alloc_hint_flags |= | |
6370 | CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE; | |
6371 | opt->alloc_hint_flags &= | |
6372 | ~CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE; | |
6373 | break; | |
6374 | case Opt_compression_hint_incompressible: | |
6375 | opt->alloc_hint_flags |= | |
6376 | CEPH_OSD_ALLOC_HINT_FLAG_INCOMPRESSIBLE; | |
6377 | opt->alloc_hint_flags &= | |
6378 | ~CEPH_OSD_ALLOC_HINT_FLAG_COMPRESSIBLE; | |
6379 | break; | |
6380 | default: | |
6381 | BUG(); | |
6382 | } | |
6383 | break; | |
82995cc6 DH |
6384 | case Opt_read_only: |
6385 | opt->read_only = true; | |
6386 | break; | |
6387 | case Opt_read_write: | |
6388 | opt->read_only = false; | |
6389 | break; | |
6390 | case Opt_lock_on_read: | |
6391 | opt->lock_on_read = true; | |
6392 | break; | |
6393 | case Opt_exclusive: | |
6394 | opt->exclusive = true; | |
6395 | break; | |
6396 | case Opt_notrim: | |
6397 | opt->trim = false; | |
6398 | break; | |
6399 | default: | |
6400 | BUG(); | |
6401 | } | |
6402 | ||
6403 | return 0; | |
6404 | ||
6405 | out_of_range: | |
2c3f3dc3 | 6406 | return inval_plog(&log, "%s out of range", param->key); |
82995cc6 DH |
6407 | } |
6408 | ||
6409 | /* | |
6410 | * This duplicates most of generic_parse_monolithic(), untying it from | |
6411 | * fs_context and skipping standard superblock and security options. | |
6412 | */ | |
6413 | static int rbd_parse_options(char *options, struct rbd_parse_opts_ctx *pctx) | |
6414 | { | |
6415 | char *key; | |
6416 | int ret = 0; | |
6417 | ||
6418 | dout("%s '%s'\n", __func__, options); | |
6419 | while ((key = strsep(&options, ",")) != NULL) { | |
6420 | if (*key) { | |
6421 | struct fs_parameter param = { | |
6422 | .key = key, | |
0f89589a | 6423 | .type = fs_value_is_flag, |
82995cc6 DH |
6424 | }; |
6425 | char *value = strchr(key, '='); | |
6426 | size_t v_len = 0; | |
6427 | ||
6428 | if (value) { | |
6429 | if (value == key) | |
6430 | continue; | |
6431 | *value++ = 0; | |
6432 | v_len = strlen(value); | |
82995cc6 DH |
6433 | param.string = kmemdup_nul(value, v_len, |
6434 | GFP_KERNEL); | |
6435 | if (!param.string) | |
6436 | return -ENOMEM; | |
0f89589a | 6437 | param.type = fs_value_is_string; |
82995cc6 DH |
6438 | } |
6439 | param.size = v_len; | |
6440 | ||
6441 | ret = rbd_parse_param(¶m, pctx); | |
6442 | kfree(param.string); | |
6443 | if (ret) | |
6444 | break; | |
6445 | } | |
6446 | } | |
6447 | ||
6448 | return ret; | |
6449 | } | |
6450 | ||
a725f65e | 6451 | /* |
859c31df AE |
6452 | * Parse the options provided for an "rbd add" (i.e., rbd image |
6453 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
6454 | * and the data written is passed here via a NUL-terminated buffer. | |
6455 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 6456 | * |
859c31df AE |
6457 | * The information extracted from these options is recorded in |
6458 | * the other parameters which return dynamically-allocated | |
6459 | * structures: | |
6460 | * ceph_opts | |
6461 | * The address of a pointer that will refer to a ceph options | |
6462 | * structure. Caller must release the returned pointer using | |
6463 | * ceph_destroy_options() when it is no longer needed. | |
6464 | * rbd_opts | |
6465 | * Address of an rbd options pointer. Fully initialized by | |
6466 | * this function; caller must release with kfree(). | |
6467 | * spec | |
6468 | * Address of an rbd image specification pointer. Fully | |
6469 | * initialized by this function based on parsed options. | |
6470 | * Caller must release with rbd_spec_put(). | |
6471 | * | |
6472 | * The options passed take this form: | |
6473 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
6474 | * where: | |
6475 | * <mon_addrs> | |
6476 | * A comma-separated list of one or more monitor addresses. | |
6477 | * A monitor address is an ip address, optionally followed | |
6478 | * by a port number (separated by a colon). | |
6479 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
6480 | * <options> | |
6481 | * A comma-separated list of ceph and/or rbd options. | |
6482 | * <pool_name> | |
6483 | * The name of the rados pool containing the rbd image. | |
6484 | * <image_name> | |
6485 | * The name of the image in that pool to map. | |
6486 | * <snap_id> | |
6487 | * An optional snapshot id. If provided, the mapping will | |
6488 | * present data from the image at the time that snapshot was | |
6489 | * created. The image head is used if no snapshot id is | |
6490 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 6491 | */ |
859c31df | 6492 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 6493 | struct ceph_options **ceph_opts, |
859c31df AE |
6494 | struct rbd_options **opts, |
6495 | struct rbd_spec **rbd_spec) | |
e28fff26 | 6496 | { |
d22f76e7 | 6497 | size_t len; |
859c31df | 6498 | char *options; |
0ddebc0c | 6499 | const char *mon_addrs; |
ecb4dc22 | 6500 | char *snap_name; |
0ddebc0c | 6501 | size_t mon_addrs_size; |
82995cc6 | 6502 | struct rbd_parse_opts_ctx pctx = { 0 }; |
dc79b113 | 6503 | int ret; |
e28fff26 AE |
6504 | |
6505 | /* The first four tokens are required */ | |
6506 | ||
7ef3214a | 6507 | len = next_token(&buf); |
4fb5d671 AE |
6508 | if (!len) { |
6509 | rbd_warn(NULL, "no monitor address(es) provided"); | |
6510 | return -EINVAL; | |
6511 | } | |
0ddebc0c | 6512 | mon_addrs = buf; |
82995cc6 | 6513 | mon_addrs_size = len; |
7ef3214a | 6514 | buf += len; |
a725f65e | 6515 | |
dc79b113 | 6516 | ret = -EINVAL; |
f28e565a AE |
6517 | options = dup_token(&buf, NULL); |
6518 | if (!options) | |
dc79b113 | 6519 | return -ENOMEM; |
4fb5d671 AE |
6520 | if (!*options) { |
6521 | rbd_warn(NULL, "no options provided"); | |
6522 | goto out_err; | |
6523 | } | |
e28fff26 | 6524 | |
c300156b ID |
6525 | pctx.spec = rbd_spec_alloc(); |
6526 | if (!pctx.spec) | |
f28e565a | 6527 | goto out_mem; |
859c31df | 6528 | |
c300156b ID |
6529 | pctx.spec->pool_name = dup_token(&buf, NULL); |
6530 | if (!pctx.spec->pool_name) | |
859c31df | 6531 | goto out_mem; |
c300156b | 6532 | if (!*pctx.spec->pool_name) { |
4fb5d671 AE |
6533 | rbd_warn(NULL, "no pool name provided"); |
6534 | goto out_err; | |
6535 | } | |
e28fff26 | 6536 | |
c300156b ID |
6537 | pctx.spec->image_name = dup_token(&buf, NULL); |
6538 | if (!pctx.spec->image_name) | |
f28e565a | 6539 | goto out_mem; |
c300156b | 6540 | if (!*pctx.spec->image_name) { |
4fb5d671 AE |
6541 | rbd_warn(NULL, "no image name provided"); |
6542 | goto out_err; | |
6543 | } | |
d4b125e9 | 6544 | |
f28e565a AE |
6545 | /* |
6546 | * Snapshot name is optional; default is to use "-" | |
6547 | * (indicating the head/no snapshot). | |
6548 | */ | |
3feeb894 | 6549 | len = next_token(&buf); |
820a5f3e | 6550 | if (!len) { |
3feeb894 AE |
6551 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
6552 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 6553 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 6554 | ret = -ENAMETOOLONG; |
f28e565a | 6555 | goto out_err; |
849b4260 | 6556 | } |
ecb4dc22 AE |
6557 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
6558 | if (!snap_name) | |
f28e565a | 6559 | goto out_mem; |
ecb4dc22 | 6560 | *(snap_name + len) = '\0'; |
c300156b | 6561 | pctx.spec->snap_name = snap_name; |
e5c35534 | 6562 | |
82995cc6 DH |
6563 | pctx.copts = ceph_alloc_options(); |
6564 | if (!pctx.copts) | |
6565 | goto out_mem; | |
6566 | ||
0ddebc0c | 6567 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 6568 | |
c300156b ID |
6569 | pctx.opts = kzalloc(sizeof(*pctx.opts), GFP_KERNEL); |
6570 | if (!pctx.opts) | |
4e9afeba AE |
6571 | goto out_mem; |
6572 | ||
c300156b ID |
6573 | pctx.opts->read_only = RBD_READ_ONLY_DEFAULT; |
6574 | pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; | |
0c93e1b7 | 6575 | pctx.opts->alloc_size = RBD_ALLOC_SIZE_DEFAULT; |
c300156b ID |
6576 | pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; |
6577 | pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; | |
6578 | pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT; | |
6579 | pctx.opts->trim = RBD_TRIM_DEFAULT; | |
d22f76e7 | 6580 | |
82995cc6 DH |
6581 | ret = ceph_parse_mon_ips(mon_addrs, mon_addrs_size, pctx.copts, NULL); |
6582 | if (ret) | |
dc79b113 | 6583 | goto out_err; |
859c31df | 6584 | |
82995cc6 DH |
6585 | ret = rbd_parse_options(options, &pctx); |
6586 | if (ret) | |
6587 | goto out_err; | |
6588 | ||
6589 | *ceph_opts = pctx.copts; | |
c300156b ID |
6590 | *opts = pctx.opts; |
6591 | *rbd_spec = pctx.spec; | |
82995cc6 | 6592 | kfree(options); |
dc79b113 | 6593 | return 0; |
82995cc6 | 6594 | |
f28e565a | 6595 | out_mem: |
dc79b113 | 6596 | ret = -ENOMEM; |
d22f76e7 | 6597 | out_err: |
c300156b | 6598 | kfree(pctx.opts); |
82995cc6 | 6599 | ceph_destroy_options(pctx.copts); |
c300156b | 6600 | rbd_spec_put(pctx.spec); |
f28e565a | 6601 | kfree(options); |
dc79b113 | 6602 | return ret; |
a725f65e AE |
6603 | } |
6604 | ||
e010dd0a ID |
6605 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
6606 | { | |
6607 | down_write(&rbd_dev->lock_rwsem); | |
6608 | if (__rbd_is_lock_owner(rbd_dev)) | |
e1fddc8f | 6609 | __rbd_release_lock(rbd_dev); |
e010dd0a ID |
6610 | up_write(&rbd_dev->lock_rwsem); |
6611 | } | |
6612 | ||
637cd060 ID |
6613 | /* |
6614 | * If the wait is interrupted, an error is returned even if the lock | |
6615 | * was successfully acquired. rbd_dev_image_unlock() will release it | |
6616 | * if needed. | |
6617 | */ | |
e010dd0a ID |
6618 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) |
6619 | { | |
637cd060 | 6620 | long ret; |
2f18d466 | 6621 | |
e010dd0a | 6622 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
637cd060 ID |
6623 | if (!rbd_dev->opts->exclusive && !rbd_dev->opts->lock_on_read) |
6624 | return 0; | |
6625 | ||
e010dd0a ID |
6626 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); |
6627 | return -EINVAL; | |
6628 | } | |
6629 | ||
3fe69921 | 6630 | if (rbd_is_ro(rbd_dev)) |
637cd060 ID |
6631 | return 0; |
6632 | ||
6633 | rbd_assert(!rbd_is_lock_owner(rbd_dev)); | |
6634 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
6635 | ret = wait_for_completion_killable_timeout(&rbd_dev->acquire_wait, | |
6636 | ceph_timeout_jiffies(rbd_dev->opts->lock_timeout)); | |
25e6be21 | 6637 | if (ret > 0) { |
637cd060 | 6638 | ret = rbd_dev->acquire_err; |
25e6be21 DY |
6639 | } else { |
6640 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
6641 | if (!ret) | |
6642 | ret = -ETIMEDOUT; | |
6643 | } | |
637cd060 | 6644 | |
2f18d466 | 6645 | if (ret) { |
637cd060 ID |
6646 | rbd_warn(rbd_dev, "failed to acquire exclusive lock: %ld", ret); |
6647 | return ret; | |
e010dd0a ID |
6648 | } |
6649 | ||
637cd060 ID |
6650 | /* |
6651 | * The lock may have been released by now, unless automatic lock | |
6652 | * transitions are disabled. | |
6653 | */ | |
6654 | rbd_assert(!rbd_dev->opts->exclusive || rbd_is_lock_owner(rbd_dev)); | |
e010dd0a ID |
6655 | return 0; |
6656 | } | |
6657 | ||
589d30e0 AE |
6658 | /* |
6659 | * An rbd format 2 image has a unique identifier, distinct from the | |
6660 | * name given to it by the user. Internally, that identifier is | |
6661 | * what's used to specify the names of objects related to the image. | |
6662 | * | |
6663 | * A special "rbd id" object is used to map an rbd image name to its | |
6664 | * id. If that object doesn't exist, then there is no v2 rbd image | |
6665 | * with the supplied name. | |
6666 | * | |
6667 | * This function will record the given rbd_dev's image_id field if | |
6668 | * it can be determined, and in that case will return 0. If any | |
6669 | * errors occur a negative errno will be returned and the rbd_dev's | |
6670 | * image_id field will be unchanged (and should be NULL). | |
6671 | */ | |
6672 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
6673 | { | |
6674 | int ret; | |
6675 | size_t size; | |
ecd4a68a | 6676 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 6677 | void *response; |
c0fba368 | 6678 | char *image_id; |
2f82ee54 | 6679 | |
2c0d0a10 AE |
6680 | /* |
6681 | * When probing a parent image, the image id is already | |
6682 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
6683 | * need to fetch the image id again in this case. We |
6684 | * do still need to set the image format though. | |
2c0d0a10 | 6685 | */ |
c0fba368 AE |
6686 | if (rbd_dev->spec->image_id) { |
6687 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
6688 | ||
2c0d0a10 | 6689 | return 0; |
c0fba368 | 6690 | } |
2c0d0a10 | 6691 | |
589d30e0 AE |
6692 | /* |
6693 | * First, see if the format 2 image id file exists, and if | |
6694 | * so, get the image's persistent id from it. | |
6695 | */ | |
ecd4a68a ID |
6696 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
6697 | rbd_dev->spec->image_name); | |
6698 | if (ret) | |
6699 | return ret; | |
6700 | ||
6701 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
6702 | |
6703 | /* Response will be an encoded string, which includes a length */ | |
589d30e0 AE |
6704 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
6705 | response = kzalloc(size, GFP_NOIO); | |
6706 | if (!response) { | |
6707 | ret = -ENOMEM; | |
6708 | goto out; | |
6709 | } | |
6710 | ||
c0fba368 AE |
6711 | /* If it doesn't exist we'll assume it's a format 1 image */ |
6712 | ||
ecd4a68a ID |
6713 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
6714 | "get_id", NULL, 0, | |
5435d206 | 6715 | response, size); |
36be9a76 | 6716 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
6717 | if (ret == -ENOENT) { |
6718 | image_id = kstrdup("", GFP_KERNEL); | |
6719 | ret = image_id ? 0 : -ENOMEM; | |
6720 | if (!ret) | |
6721 | rbd_dev->image_format = 1; | |
7dd440c9 | 6722 | } else if (ret >= 0) { |
c0fba368 AE |
6723 | void *p = response; |
6724 | ||
6725 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 6726 | NULL, GFP_NOIO); |
461f758a | 6727 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
6728 | if (!ret) |
6729 | rbd_dev->image_format = 2; | |
c0fba368 AE |
6730 | } |
6731 | ||
6732 | if (!ret) { | |
6733 | rbd_dev->spec->image_id = image_id; | |
6734 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
6735 | } |
6736 | out: | |
6737 | kfree(response); | |
ecd4a68a | 6738 | ceph_oid_destroy(&oid); |
589d30e0 AE |
6739 | return ret; |
6740 | } | |
6741 | ||
3abef3b3 AE |
6742 | /* |
6743 | * Undo whatever state changes are made by v1 or v2 header info | |
6744 | * call. | |
6745 | */ | |
6fd48b3b AE |
6746 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
6747 | { | |
6748 | struct rbd_image_header *header; | |
6749 | ||
e69b8d41 | 6750 | rbd_dev_parent_put(rbd_dev); |
22e8bd51 | 6751 | rbd_object_map_free(rbd_dev); |
da5ef6be | 6752 | rbd_dev_mapping_clear(rbd_dev); |
6fd48b3b AE |
6753 | |
6754 | /* Free dynamic fields from the header, then zero it out */ | |
6755 | ||
6756 | header = &rbd_dev->header; | |
812164f8 | 6757 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
6758 | kfree(header->snap_sizes); |
6759 | kfree(header->snap_names); | |
6760 | kfree(header->object_prefix); | |
6761 | memset(header, 0, sizeof (*header)); | |
6762 | } | |
6763 | ||
2df3fac7 | 6764 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
6765 | { |
6766 | int ret; | |
a30b71b9 | 6767 | |
1e130199 | 6768 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 6769 | if (ret) |
b1b5402a AE |
6770 | goto out_err; |
6771 | ||
2df3fac7 AE |
6772 | /* |
6773 | * Get the and check features for the image. Currently the | |
6774 | * features are assumed to never change. | |
6775 | */ | |
b1b5402a | 6776 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 6777 | if (ret) |
9d475de5 | 6778 | goto out_err; |
35d489f9 | 6779 | |
cc070d59 AE |
6780 | /* If the image supports fancy striping, get its parameters */ |
6781 | ||
6782 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
6783 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
6784 | if (ret < 0) | |
6785 | goto out_err; | |
6786 | } | |
a30b71b9 | 6787 | |
7e97332e ID |
6788 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
6789 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
6790 | if (ret) | |
6791 | goto out_err; | |
6792 | } | |
6793 | ||
263423f8 | 6794 | rbd_init_layout(rbd_dev); |
35152979 | 6795 | return 0; |
263423f8 | 6796 | |
9d475de5 | 6797 | out_err: |
642a2537 | 6798 | rbd_dev->header.features = 0; |
1e130199 AE |
6799 | kfree(rbd_dev->header.object_prefix); |
6800 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 6801 | return ret; |
a30b71b9 AE |
6802 | } |
6803 | ||
6d69bb53 ID |
6804 | /* |
6805 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
6806 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
6807 | * length of the already discovered part of the parent chain. | |
6808 | */ | |
6809 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 6810 | { |
2f82ee54 | 6811 | struct rbd_device *parent = NULL; |
124afba2 AE |
6812 | int ret; |
6813 | ||
6814 | if (!rbd_dev->parent_spec) | |
6815 | return 0; | |
124afba2 | 6816 | |
6d69bb53 ID |
6817 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
6818 | pr_info("parent chain is too long (%d)\n", depth); | |
6819 | ret = -EINVAL; | |
6820 | goto out_err; | |
6821 | } | |
6822 | ||
1643dfa4 | 6823 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
6824 | if (!parent) { |
6825 | ret = -ENOMEM; | |
124afba2 | 6826 | goto out_err; |
1f2c6651 ID |
6827 | } |
6828 | ||
6829 | /* | |
6830 | * Images related by parent/child relationships always share | |
6831 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
6832 | */ | |
6833 | __rbd_get_client(rbd_dev->rbd_client); | |
6834 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 6835 | |
39258aa2 ID |
6836 | __set_bit(RBD_DEV_FLAG_READONLY, &parent->flags); |
6837 | ||
6d69bb53 | 6838 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
6839 | if (ret < 0) |
6840 | goto out_err; | |
1f2c6651 | 6841 | |
124afba2 | 6842 | rbd_dev->parent = parent; |
a2acd00e | 6843 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 6844 | return 0; |
1f2c6651 | 6845 | |
124afba2 | 6846 | out_err: |
1f2c6651 | 6847 | rbd_dev_unparent(rbd_dev); |
1761b229 | 6848 | rbd_dev_destroy(parent); |
124afba2 AE |
6849 | return ret; |
6850 | } | |
6851 | ||
5769ed0c ID |
6852 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
6853 | { | |
6854 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5769ed0c ID |
6855 | rbd_free_disk(rbd_dev); |
6856 | if (!single_major) | |
6857 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
6858 | } | |
6859 | ||
811c6688 ID |
6860 | /* |
6861 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
6862 | * upon return. | |
6863 | */ | |
200a6a8b | 6864 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 6865 | { |
83a06263 | 6866 | int ret; |
d1cf5788 | 6867 | |
9b60e70b | 6868 | /* Record our major and minor device numbers. */ |
83a06263 | 6869 | |
9b60e70b ID |
6870 | if (!single_major) { |
6871 | ret = register_blkdev(0, rbd_dev->name); | |
6872 | if (ret < 0) | |
1643dfa4 | 6873 | goto err_out_unlock; |
9b60e70b ID |
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 | } | |
83a06263 AE |
6881 | |
6882 | /* Set up the blkdev mapping. */ | |
6883 | ||
6884 | ret = rbd_init_disk(rbd_dev); | |
6885 | if (ret) | |
6886 | goto err_out_blkdev; | |
6887 | ||
f35a4dee | 6888 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
39258aa2 | 6889 | set_disk_ro(rbd_dev->disk, rbd_is_ro(rbd_dev)); |
f35a4dee | 6890 | |
5769ed0c | 6891 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 6892 | if (ret) |
da5ef6be | 6893 | goto err_out_disk; |
83a06263 | 6894 | |
129b79d4 | 6895 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 6896 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 6897 | return 0; |
2f82ee54 | 6898 | |
83a06263 AE |
6899 | err_out_disk: |
6900 | rbd_free_disk(rbd_dev); | |
6901 | err_out_blkdev: | |
9b60e70b ID |
6902 | if (!single_major) |
6903 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
6904 | err_out_unlock: |
6905 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
6906 | return ret; |
6907 | } | |
6908 | ||
332bb12d AE |
6909 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
6910 | { | |
6911 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 6912 | int ret; |
332bb12d AE |
6913 | |
6914 | /* Record the header object name for this rbd image. */ | |
6915 | ||
6916 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 6917 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
6918 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
6919 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 6920 | else |
c41d13a3 ID |
6921 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
6922 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 6923 | |
c41d13a3 | 6924 | return ret; |
332bb12d AE |
6925 | } |
6926 | ||
b9ef2b88 ID |
6927 | static void rbd_print_dne(struct rbd_device *rbd_dev, bool is_snap) |
6928 | { | |
6929 | if (!is_snap) { | |
6930 | pr_info("image %s/%s%s%s does not exist\n", | |
6931 | rbd_dev->spec->pool_name, | |
6932 | rbd_dev->spec->pool_ns ?: "", | |
6933 | rbd_dev->spec->pool_ns ? "/" : "", | |
6934 | rbd_dev->spec->image_name); | |
6935 | } else { | |
6936 | pr_info("snap %s/%s%s%s@%s does not exist\n", | |
6937 | rbd_dev->spec->pool_name, | |
6938 | rbd_dev->spec->pool_ns ?: "", | |
6939 | rbd_dev->spec->pool_ns ? "/" : "", | |
6940 | rbd_dev->spec->image_name, | |
6941 | rbd_dev->spec->snap_name); | |
6942 | } | |
6943 | } | |
6944 | ||
200a6a8b AE |
6945 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
6946 | { | |
b8776051 | 6947 | if (!rbd_is_ro(rbd_dev)) |
fd22aef8 | 6948 | rbd_unregister_watch(rbd_dev); |
952c48b0 ID |
6949 | |
6950 | rbd_dev_unprobe(rbd_dev); | |
6fd48b3b AE |
6951 | rbd_dev->image_format = 0; |
6952 | kfree(rbd_dev->spec->image_id); | |
6953 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
6954 | } |
6955 | ||
a30b71b9 AE |
6956 | /* |
6957 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
6958 | * device. If this image is the one being mapped (i.e., not a |
6959 | * parent), initiate a watch on its header object before using that | |
6960 | * object to get detailed information about the rbd image. | |
0e4e1de5 ID |
6961 | * |
6962 | * On success, returns with header_rwsem held for write if called | |
6963 | * with @depth == 0. | |
a30b71b9 | 6964 | */ |
6d69bb53 | 6965 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 | 6966 | { |
b9ef2b88 | 6967 | bool need_watch = !rbd_is_ro(rbd_dev); |
a30b71b9 AE |
6968 | int ret; |
6969 | ||
6970 | /* | |
3abef3b3 AE |
6971 | * Get the id from the image id object. Unless there's an |
6972 | * error, rbd_dev->spec->image_id will be filled in with | |
6973 | * a dynamically-allocated string, and rbd_dev->image_format | |
6974 | * will be set to either 1 or 2. | |
a30b71b9 AE |
6975 | */ |
6976 | ret = rbd_dev_image_id(rbd_dev); | |
6977 | if (ret) | |
c0fba368 | 6978 | return ret; |
c0fba368 | 6979 | |
332bb12d AE |
6980 | ret = rbd_dev_header_name(rbd_dev); |
6981 | if (ret) | |
6982 | goto err_out_format; | |
6983 | ||
b9ef2b88 | 6984 | if (need_watch) { |
99d16943 | 6985 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
6986 | if (ret) { |
6987 | if (ret == -ENOENT) | |
b9ef2b88 | 6988 | rbd_print_dne(rbd_dev, false); |
c41d13a3 | 6989 | goto err_out_format; |
1fe48023 | 6990 | } |
1f3ef788 | 6991 | } |
b644de2b | 6992 | |
0e4e1de5 ID |
6993 | if (!depth) |
6994 | down_write(&rbd_dev->header_rwsem); | |
6995 | ||
a720ae09 | 6996 | ret = rbd_dev_header_info(rbd_dev); |
b9ef2b88 ID |
6997 | if (ret) { |
6998 | if (ret == -ENOENT && !need_watch) | |
6999 | rbd_print_dne(rbd_dev, false); | |
952c48b0 | 7000 | goto err_out_probe; |
b9ef2b88 | 7001 | } |
83a06263 | 7002 | |
04077599 ID |
7003 | /* |
7004 | * If this image is the one being mapped, we have pool name and | |
7005 | * id, image name and id, and snap name - need to fill snap id. | |
7006 | * Otherwise this is a parent image, identified by pool, image | |
7007 | * and snap ids - need to fill in names for those ids. | |
7008 | */ | |
6d69bb53 | 7009 | if (!depth) |
04077599 ID |
7010 | ret = rbd_spec_fill_snap_id(rbd_dev); |
7011 | else | |
7012 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
7013 | if (ret) { |
7014 | if (ret == -ENOENT) | |
b9ef2b88 | 7015 | rbd_print_dne(rbd_dev, true); |
33dca39f | 7016 | goto err_out_probe; |
1fe48023 | 7017 | } |
9bb81c9b | 7018 | |
da5ef6be ID |
7019 | ret = rbd_dev_mapping_set(rbd_dev); |
7020 | if (ret) | |
7021 | goto err_out_probe; | |
7022 | ||
f3c0e459 | 7023 | if (rbd_is_snap(rbd_dev) && |
22e8bd51 ID |
7024 | (rbd_dev->header.features & RBD_FEATURE_OBJECT_MAP)) { |
7025 | ret = rbd_object_map_load(rbd_dev); | |
7026 | if (ret) | |
7027 | goto err_out_probe; | |
7028 | } | |
7029 | ||
e8f59b59 ID |
7030 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
7031 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
7032 | if (ret) | |
7033 | goto err_out_probe; | |
e8f59b59 ID |
7034 | } |
7035 | ||
6d69bb53 | 7036 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
7037 | if (ret) |
7038 | goto err_out_probe; | |
7039 | ||
7040 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 7041 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 7042 | return 0; |
e8f59b59 | 7043 | |
6fd48b3b | 7044 | err_out_probe: |
0e4e1de5 ID |
7045 | if (!depth) |
7046 | up_write(&rbd_dev->header_rwsem); | |
b9ef2b88 | 7047 | if (need_watch) |
99d16943 | 7048 | rbd_unregister_watch(rbd_dev); |
952c48b0 | 7049 | rbd_dev_unprobe(rbd_dev); |
332bb12d AE |
7050 | err_out_format: |
7051 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
7052 | kfree(rbd_dev->spec->image_id); |
7053 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
7054 | return ret; |
7055 | } | |
7056 | ||
9b60e70b ID |
7057 | static ssize_t do_rbd_add(struct bus_type *bus, |
7058 | const char *buf, | |
7059 | size_t count) | |
602adf40 | 7060 | { |
cb8627c7 | 7061 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 7062 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 7063 | struct rbd_options *rbd_opts = NULL; |
859c31df | 7064 | struct rbd_spec *spec = NULL; |
9d3997fd | 7065 | struct rbd_client *rbdc; |
b51c83c2 | 7066 | int rc; |
602adf40 | 7067 | |
f44d04e6 ID |
7068 | if (!capable(CAP_SYS_ADMIN)) |
7069 | return -EPERM; | |
7070 | ||
602adf40 YS |
7071 | if (!try_module_get(THIS_MODULE)) |
7072 | return -ENODEV; | |
7073 | ||
602adf40 | 7074 | /* parse add command */ |
859c31df | 7075 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 7076 | if (rc < 0) |
dd5ac32d | 7077 | goto out; |
78cea76e | 7078 | |
9d3997fd AE |
7079 | rbdc = rbd_get_client(ceph_opts); |
7080 | if (IS_ERR(rbdc)) { | |
7081 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 7082 | goto err_out_args; |
9d3997fd | 7083 | } |
602adf40 | 7084 | |
602adf40 | 7085 | /* pick the pool */ |
dd435855 | 7086 | rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
1fe48023 ID |
7087 | if (rc < 0) { |
7088 | if (rc == -ENOENT) | |
7089 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 7090 | goto err_out_client; |
1fe48023 | 7091 | } |
c0cd10db | 7092 | spec->pool_id = (u64)rc; |
859c31df | 7093 | |
d147543d | 7094 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
7095 | if (!rbd_dev) { |
7096 | rc = -ENOMEM; | |
bd4ba655 | 7097 | goto err_out_client; |
b51c83c2 | 7098 | } |
c53d5893 AE |
7099 | rbdc = NULL; /* rbd_dev now owns this */ |
7100 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 7101 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 7102 | |
39258aa2 ID |
7103 | /* if we are mapping a snapshot it will be a read-only mapping */ |
7104 | if (rbd_dev->opts->read_only || | |
7105 | strcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME)) | |
7106 | __set_bit(RBD_DEV_FLAG_READONLY, &rbd_dev->flags); | |
7107 | ||
0d6d1e9c MC |
7108 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
7109 | if (!rbd_dev->config_info) { | |
7110 | rc = -ENOMEM; | |
7111 | goto err_out_rbd_dev; | |
7112 | } | |
7113 | ||
6d69bb53 | 7114 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0e4e1de5 | 7115 | if (rc < 0) |
c53d5893 | 7116 | goto err_out_rbd_dev; |
05fd6f6f | 7117 | |
0c93e1b7 ID |
7118 | if (rbd_dev->opts->alloc_size > rbd_dev->layout.object_size) { |
7119 | rbd_warn(rbd_dev, "alloc_size adjusted to %u", | |
7120 | rbd_dev->layout.object_size); | |
7121 | rbd_dev->opts->alloc_size = rbd_dev->layout.object_size; | |
7122 | } | |
7123 | ||
b536f69a | 7124 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 7125 | if (rc) |
8b679ec5 | 7126 | goto err_out_image_probe; |
3abef3b3 | 7127 | |
637cd060 ID |
7128 | rc = rbd_add_acquire_lock(rbd_dev); |
7129 | if (rc) | |
7130 | goto err_out_image_lock; | |
3abef3b3 | 7131 | |
5769ed0c ID |
7132 | /* Everything's ready. Announce the disk to the world. */ |
7133 | ||
7134 | rc = device_add(&rbd_dev->dev); | |
7135 | if (rc) | |
e010dd0a | 7136 | goto err_out_image_lock; |
5769ed0c | 7137 | |
3325322f | 7138 | device_add_disk(&rbd_dev->dev, rbd_dev->disk, NULL); |
5769ed0c ID |
7139 | /* see rbd_init_disk() */ |
7140 | blk_put_queue(rbd_dev->disk->queue); | |
7141 | ||
7142 | spin_lock(&rbd_dev_list_lock); | |
7143 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
7144 | spin_unlock(&rbd_dev_list_lock); | |
7145 | ||
7146 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
7147 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
7148 | rbd_dev->header.features); | |
dd5ac32d ID |
7149 | rc = count; |
7150 | out: | |
7151 | module_put(THIS_MODULE); | |
7152 | return rc; | |
b536f69a | 7153 | |
e010dd0a ID |
7154 | err_out_image_lock: |
7155 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c | 7156 | rbd_dev_device_release(rbd_dev); |
8b679ec5 ID |
7157 | err_out_image_probe: |
7158 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
7159 | err_out_rbd_dev: |
7160 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 7161 | err_out_client: |
9d3997fd | 7162 | rbd_put_client(rbdc); |
0ddebc0c | 7163 | err_out_args: |
859c31df | 7164 | rbd_spec_put(spec); |
d147543d | 7165 | kfree(rbd_opts); |
dd5ac32d | 7166 | goto out; |
602adf40 YS |
7167 | } |
7168 | ||
7e9586ba | 7169 | static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count) |
9b60e70b ID |
7170 | { |
7171 | if (single_major) | |
7172 | return -EINVAL; | |
7173 | ||
7174 | return do_rbd_add(bus, buf, count); | |
7175 | } | |
7176 | ||
7e9586ba GKH |
7177 | static ssize_t add_single_major_store(struct bus_type *bus, const char *buf, |
7178 | size_t count) | |
9b60e70b ID |
7179 | { |
7180 | return do_rbd_add(bus, buf, count); | |
7181 | } | |
7182 | ||
05a46afd AE |
7183 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
7184 | { | |
ad945fc1 | 7185 | while (rbd_dev->parent) { |
05a46afd AE |
7186 | struct rbd_device *first = rbd_dev; |
7187 | struct rbd_device *second = first->parent; | |
7188 | struct rbd_device *third; | |
7189 | ||
7190 | /* | |
7191 | * Follow to the parent with no grandparent and | |
7192 | * remove it. | |
7193 | */ | |
7194 | while (second && (third = second->parent)) { | |
7195 | first = second; | |
7196 | second = third; | |
7197 | } | |
ad945fc1 | 7198 | rbd_assert(second); |
8ad42cd0 | 7199 | rbd_dev_image_release(second); |
8b679ec5 | 7200 | rbd_dev_destroy(second); |
ad945fc1 AE |
7201 | first->parent = NULL; |
7202 | first->parent_overlap = 0; | |
7203 | ||
7204 | rbd_assert(first->parent_spec); | |
05a46afd AE |
7205 | rbd_spec_put(first->parent_spec); |
7206 | first->parent_spec = NULL; | |
05a46afd AE |
7207 | } |
7208 | } | |
7209 | ||
9b60e70b ID |
7210 | static ssize_t do_rbd_remove(struct bus_type *bus, |
7211 | const char *buf, | |
7212 | size_t count) | |
602adf40 YS |
7213 | { |
7214 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
7215 | struct list_head *tmp; |
7216 | int dev_id; | |
0276dca6 | 7217 | char opt_buf[6]; |
0276dca6 | 7218 | bool force = false; |
0d8189e1 | 7219 | int ret; |
602adf40 | 7220 | |
f44d04e6 ID |
7221 | if (!capable(CAP_SYS_ADMIN)) |
7222 | return -EPERM; | |
7223 | ||
0276dca6 MC |
7224 | dev_id = -1; |
7225 | opt_buf[0] = '\0'; | |
7226 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
7227 | if (dev_id < 0) { | |
7228 | pr_err("dev_id out of range\n"); | |
602adf40 | 7229 | return -EINVAL; |
0276dca6 MC |
7230 | } |
7231 | if (opt_buf[0] != '\0') { | |
7232 | if (!strcmp(opt_buf, "force")) { | |
7233 | force = true; | |
7234 | } else { | |
7235 | pr_err("bad remove option at '%s'\n", opt_buf); | |
7236 | return -EINVAL; | |
7237 | } | |
7238 | } | |
602adf40 | 7239 | |
751cc0e3 AE |
7240 | ret = -ENOENT; |
7241 | spin_lock(&rbd_dev_list_lock); | |
7242 | list_for_each(tmp, &rbd_dev_list) { | |
7243 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
7244 | if (rbd_dev->dev_id == dev_id) { | |
7245 | ret = 0; | |
7246 | break; | |
7247 | } | |
42382b70 | 7248 | } |
751cc0e3 AE |
7249 | if (!ret) { |
7250 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 7251 | if (rbd_dev->open_count && !force) |
751cc0e3 | 7252 | ret = -EBUSY; |
85f5a4d6 ID |
7253 | else if (test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
7254 | &rbd_dev->flags)) | |
7255 | ret = -EINPROGRESS; | |
751cc0e3 AE |
7256 | spin_unlock_irq(&rbd_dev->lock); |
7257 | } | |
7258 | spin_unlock(&rbd_dev_list_lock); | |
85f5a4d6 | 7259 | if (ret) |
1ba0f1e7 | 7260 | return ret; |
751cc0e3 | 7261 | |
0276dca6 MC |
7262 | if (force) { |
7263 | /* | |
7264 | * Prevent new IO from being queued and wait for existing | |
7265 | * IO to complete/fail. | |
7266 | */ | |
7267 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
7268 | blk_set_queue_dying(rbd_dev->disk->queue); | |
7269 | } | |
7270 | ||
5769ed0c ID |
7271 | del_gendisk(rbd_dev->disk); |
7272 | spin_lock(&rbd_dev_list_lock); | |
7273 | list_del_init(&rbd_dev->node); | |
7274 | spin_unlock(&rbd_dev_list_lock); | |
7275 | device_del(&rbd_dev->dev); | |
fca27065 | 7276 | |
e010dd0a | 7277 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 7278 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 7279 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 7280 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 7281 | return count; |
602adf40 YS |
7282 | } |
7283 | ||
7e9586ba | 7284 | static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count) |
9b60e70b ID |
7285 | { |
7286 | if (single_major) | |
7287 | return -EINVAL; | |
7288 | ||
7289 | return do_rbd_remove(bus, buf, count); | |
7290 | } | |
7291 | ||
7e9586ba GKH |
7292 | static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf, |
7293 | size_t count) | |
9b60e70b ID |
7294 | { |
7295 | return do_rbd_remove(bus, buf, count); | |
7296 | } | |
7297 | ||
602adf40 YS |
7298 | /* |
7299 | * create control files in sysfs | |
dfc5606d | 7300 | * /sys/bus/rbd/... |
602adf40 | 7301 | */ |
7d8dc534 | 7302 | static int __init rbd_sysfs_init(void) |
602adf40 | 7303 | { |
dfc5606d | 7304 | int ret; |
602adf40 | 7305 | |
fed4c143 | 7306 | ret = device_register(&rbd_root_dev); |
21079786 | 7307 | if (ret < 0) |
dfc5606d | 7308 | return ret; |
602adf40 | 7309 | |
fed4c143 AE |
7310 | ret = bus_register(&rbd_bus_type); |
7311 | if (ret < 0) | |
7312 | device_unregister(&rbd_root_dev); | |
602adf40 | 7313 | |
602adf40 YS |
7314 | return ret; |
7315 | } | |
7316 | ||
7d8dc534 | 7317 | static void __exit rbd_sysfs_cleanup(void) |
602adf40 | 7318 | { |
dfc5606d | 7319 | bus_unregister(&rbd_bus_type); |
fed4c143 | 7320 | device_unregister(&rbd_root_dev); |
602adf40 YS |
7321 | } |
7322 | ||
7d8dc534 | 7323 | static int __init rbd_slab_init(void) |
1c2a9dfe AE |
7324 | { |
7325 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 7326 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
7327 | if (!rbd_img_request_cache) |
7328 | return -ENOMEM; | |
7329 | ||
7330 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 7331 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
7332 | if (!rbd_obj_request_cache) |
7333 | goto out_err; | |
7334 | ||
6c696d85 | 7335 | return 0; |
1c2a9dfe | 7336 | |
6c696d85 | 7337 | out_err: |
868311b1 AE |
7338 | kmem_cache_destroy(rbd_img_request_cache); |
7339 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
7340 | return -ENOMEM; |
7341 | } | |
7342 | ||
7343 | static void rbd_slab_exit(void) | |
7344 | { | |
868311b1 AE |
7345 | rbd_assert(rbd_obj_request_cache); |
7346 | kmem_cache_destroy(rbd_obj_request_cache); | |
7347 | rbd_obj_request_cache = NULL; | |
7348 | ||
1c2a9dfe AE |
7349 | rbd_assert(rbd_img_request_cache); |
7350 | kmem_cache_destroy(rbd_img_request_cache); | |
7351 | rbd_img_request_cache = NULL; | |
7352 | } | |
7353 | ||
cc344fa1 | 7354 | static int __init rbd_init(void) |
602adf40 YS |
7355 | { |
7356 | int rc; | |
7357 | ||
1e32d34c AE |
7358 | if (!libceph_compatible(NULL)) { |
7359 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
7360 | return -EINVAL; |
7361 | } | |
e1b4d96d | 7362 | |
1c2a9dfe | 7363 | rc = rbd_slab_init(); |
602adf40 YS |
7364 | if (rc) |
7365 | return rc; | |
e1b4d96d | 7366 | |
f5ee37bd ID |
7367 | /* |
7368 | * The number of active work items is limited by the number of | |
f77303bd | 7369 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
7370 | */ |
7371 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
7372 | if (!rbd_wq) { | |
7373 | rc = -ENOMEM; | |
7374 | goto err_out_slab; | |
7375 | } | |
7376 | ||
9b60e70b ID |
7377 | if (single_major) { |
7378 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
7379 | if (rbd_major < 0) { | |
7380 | rc = rbd_major; | |
f5ee37bd | 7381 | goto err_out_wq; |
9b60e70b ID |
7382 | } |
7383 | } | |
7384 | ||
1c2a9dfe AE |
7385 | rc = rbd_sysfs_init(); |
7386 | if (rc) | |
9b60e70b ID |
7387 | goto err_out_blkdev; |
7388 | ||
7389 | if (single_major) | |
7390 | pr_info("loaded (major %d)\n", rbd_major); | |
7391 | else | |
7392 | pr_info("loaded\n"); | |
1c2a9dfe | 7393 | |
e1b4d96d ID |
7394 | return 0; |
7395 | ||
9b60e70b ID |
7396 | err_out_blkdev: |
7397 | if (single_major) | |
7398 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
7399 | err_out_wq: |
7400 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
7401 | err_out_slab: |
7402 | rbd_slab_exit(); | |
1c2a9dfe | 7403 | return rc; |
602adf40 YS |
7404 | } |
7405 | ||
cc344fa1 | 7406 | static void __exit rbd_exit(void) |
602adf40 | 7407 | { |
ffe312cf | 7408 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 7409 | rbd_sysfs_cleanup(); |
9b60e70b ID |
7410 | if (single_major) |
7411 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 7412 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 7413 | rbd_slab_exit(); |
602adf40 YS |
7414 | } |
7415 | ||
7416 | module_init(rbd_init); | |
7417 | module_exit(rbd_exit); | |
7418 | ||
d552c619 | 7419 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
7420 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
7421 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
7422 | /* following authorship retained from original osdblk.c */ |
7423 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
7424 | ||
90da258b | 7425 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 7426 | MODULE_LICENSE("GPL"); |