Commit | Line | Data |
---|---|---|
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> |
602adf40 | 35 | #include <linux/ceph/decode.h> |
59c2be1e | 36 | #include <linux/parser.h> |
30d1cff8 | 37 | #include <linux/bsearch.h> |
602adf40 YS |
38 | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/module.h> | |
7ad18afa | 42 | #include <linux/blk-mq.h> |
602adf40 YS |
43 | #include <linux/fs.h> |
44 | #include <linux/blkdev.h> | |
1c2a9dfe | 45 | #include <linux/slab.h> |
f8a22fc2 | 46 | #include <linux/idr.h> |
bc1ecc65 | 47 | #include <linux/workqueue.h> |
602adf40 YS |
48 | |
49 | #include "rbd_types.h" | |
50 | ||
aafb230e AE |
51 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
52 | ||
593a9e7b AE |
53 | /* |
54 | * The basic unit of block I/O is a sector. It is interpreted in a | |
55 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
56 | * universally 512 bytes. These symbols are just slightly more | |
57 | * meaningful than the bare numbers they represent. | |
58 | */ | |
59 | #define SECTOR_SHIFT 9 | |
60 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
61 | ||
a2acd00e AE |
62 | /* |
63 | * Increment the given counter and return its updated value. | |
64 | * If the counter is already 0 it will not be incremented. | |
65 | * If the counter is already at its maximum value returns | |
66 | * -EINVAL without updating it. | |
67 | */ | |
68 | static int atomic_inc_return_safe(atomic_t *v) | |
69 | { | |
70 | unsigned int counter; | |
71 | ||
72 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
73 | if (counter <= (unsigned int)INT_MAX) | |
74 | return (int)counter; | |
75 | ||
76 | atomic_dec(v); | |
77 | ||
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
82 | static int atomic_dec_return_safe(atomic_t *v) | |
83 | { | |
84 | int counter; | |
85 | ||
86 | counter = atomic_dec_return(v); | |
87 | if (counter >= 0) | |
88 | return counter; | |
89 | ||
90 | atomic_inc(v); | |
91 | ||
92 | return -EINVAL; | |
93 | } | |
94 | ||
f0f8cef5 | 95 | #define RBD_DRV_NAME "rbd" |
602adf40 | 96 | |
7e513d43 ID |
97 | #define RBD_MINORS_PER_MAJOR 256 |
98 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 99 | |
6d69bb53 ID |
100 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
101 | ||
d4b125e9 AE |
102 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
103 | #define RBD_MAX_SNAP_NAME_LEN \ | |
104 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
105 | ||
35d489f9 | 106 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
107 | |
108 | #define RBD_SNAP_HEAD_NAME "-" | |
109 | ||
9682fc6d AE |
110 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
111 | ||
9e15b77d AE |
112 | /* This allows a single page to hold an image name sent by OSD */ |
113 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 114 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 115 | |
1e130199 | 116 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 117 | |
ed95b21a | 118 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
99d16943 ID |
119 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
120 | ||
d889140c AE |
121 | /* Feature bits */ |
122 | ||
8767b293 ID |
123 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
124 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) | |
125 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) | |
126 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) | |
e573427a | 127 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
8767b293 | 128 | |
ed95b21a ID |
129 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
130 | RBD_FEATURE_STRIPINGV2 | \ | |
7e97332e | 131 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
e573427a ID |
132 | RBD_FEATURE_DATA_POOL | \ |
133 | RBD_FEATURE_OPERATIONS) | |
d889140c AE |
134 | |
135 | /* Features supported by this (client software) implementation. */ | |
136 | ||
770eba6e | 137 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 138 | |
81a89793 AE |
139 | /* |
140 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
141 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 142 | */ |
602adf40 YS |
143 | #define DEV_NAME_LEN 32 |
144 | ||
145 | /* | |
146 | * block device image metadata (in-memory version) | |
147 | */ | |
148 | struct rbd_image_header { | |
f35a4dee | 149 | /* These six fields never change for a given rbd image */ |
849b4260 | 150 | char *object_prefix; |
602adf40 | 151 | __u8 obj_order; |
f35a4dee AE |
152 | u64 stripe_unit; |
153 | u64 stripe_count; | |
7e97332e | 154 | s64 data_pool_id; |
f35a4dee | 155 | u64 features; /* Might be changeable someday? */ |
602adf40 | 156 | |
f84344f3 AE |
157 | /* The remaining fields need to be updated occasionally */ |
158 | u64 image_size; | |
159 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
160 | char *snap_names; /* format 1 only */ |
161 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
162 | }; |
163 | ||
0d7dbfce AE |
164 | /* |
165 | * An rbd image specification. | |
166 | * | |
167 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
168 | * identify an image. Each rbd_dev structure includes a pointer to |
169 | * an rbd_spec structure that encapsulates this identity. | |
170 | * | |
171 | * Each of the id's in an rbd_spec has an associated name. For a | |
172 | * user-mapped image, the names are supplied and the id's associated | |
173 | * with them are looked up. For a layered image, a parent image is | |
174 | * defined by the tuple, and the names are looked up. | |
175 | * | |
176 | * An rbd_dev structure contains a parent_spec pointer which is | |
177 | * non-null if the image it represents is a child in a layered | |
178 | * image. This pointer will refer to the rbd_spec structure used | |
179 | * by the parent rbd_dev for its own identity (i.e., the structure | |
180 | * is shared between the parent and child). | |
181 | * | |
182 | * Since these structures are populated once, during the discovery | |
183 | * phase of image construction, they are effectively immutable so | |
184 | * we make no effort to synchronize access to them. | |
185 | * | |
186 | * Note that code herein does not assume the image name is known (it | |
187 | * could be a null pointer). | |
0d7dbfce AE |
188 | */ |
189 | struct rbd_spec { | |
190 | u64 pool_id; | |
ecb4dc22 | 191 | const char *pool_name; |
0d7dbfce | 192 | |
ecb4dc22 AE |
193 | const char *image_id; |
194 | const char *image_name; | |
0d7dbfce AE |
195 | |
196 | u64 snap_id; | |
ecb4dc22 | 197 | const char *snap_name; |
0d7dbfce AE |
198 | |
199 | struct kref kref; | |
200 | }; | |
201 | ||
602adf40 | 202 | /* |
f0f8cef5 | 203 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
204 | */ |
205 | struct rbd_client { | |
206 | struct ceph_client *client; | |
207 | struct kref kref; | |
208 | struct list_head node; | |
209 | }; | |
210 | ||
bf0d5f50 AE |
211 | struct rbd_img_request; |
212 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
213 | ||
214 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
215 | ||
216 | struct rbd_obj_request; | |
217 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
218 | ||
9969ebc5 | 219 | enum obj_request_type { |
a1fbb5e7 | 220 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 221 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 222 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
9969ebc5 | 223 | }; |
bf0d5f50 | 224 | |
6d2940c8 | 225 | enum obj_operation_type { |
a1fbb5e7 | 226 | OBJ_OP_READ = 1, |
6d2940c8 | 227 | OBJ_OP_WRITE, |
90e98c52 | 228 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
229 | }; |
230 | ||
926f9b3f AE |
231 | enum obj_req_flags { |
232 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 233 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
926f9b3f AE |
234 | }; |
235 | ||
3da691bf ID |
236 | /* |
237 | * Writes go through the following state machine to deal with | |
238 | * layering: | |
239 | * | |
240 | * need copyup | |
241 | * RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP | |
242 | * | ^ | | |
243 | * v \------------------------------/ | |
244 | * done | |
245 | * ^ | |
246 | * | | |
247 | * RBD_OBJ_WRITE_FLAT | |
248 | * | |
249 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
250 | * there is a parent or not. | |
251 | */ | |
252 | enum rbd_obj_write_state { | |
253 | RBD_OBJ_WRITE_FLAT = 1, | |
254 | RBD_OBJ_WRITE_GUARD, | |
255 | RBD_OBJ_WRITE_COPYUP, | |
256 | }; | |
257 | ||
bf0d5f50 | 258 | struct rbd_obj_request { |
a90bb0c1 | 259 | u64 object_no; |
bf0d5f50 AE |
260 | u64 offset; /* object start byte */ |
261 | u64 length; /* bytes from offset */ | |
926f9b3f | 262 | unsigned long flags; |
3da691bf ID |
263 | union { |
264 | bool tried_parent; /* for reads */ | |
265 | enum rbd_obj_write_state write_state; /* for writes */ | |
266 | }; | |
bf0d5f50 | 267 | |
c5b5ef6c AE |
268 | /* |
269 | * An object request associated with an image will have its | |
270 | * img_data flag set; a standalone object request will not. | |
271 | * | |
c5b5ef6c AE |
272 | * Finally, an object request for rbd image data will have |
273 | * which != BAD_WHICH, and will have a non-null img_request | |
274 | * pointer. The value of which will be in the range | |
275 | * 0..(img_request->obj_request_count-1). | |
276 | */ | |
51c3509e ID |
277 | struct rbd_img_request *img_request; |
278 | u64 img_offset; | |
279 | /* links for img_request->obj_requests list */ | |
280 | struct list_head links; | |
bf0d5f50 AE |
281 | u32 which; /* posn image request list */ |
282 | ||
283 | enum obj_request_type type; | |
788e2df3 | 284 | union { |
5359a17d | 285 | struct ceph_bio_iter bio_pos; |
788e2df3 | 286 | struct { |
7e07efb1 ID |
287 | struct ceph_bvec_iter bvec_pos; |
288 | u32 bvec_count; | |
788e2df3 AE |
289 | }; |
290 | }; | |
7e07efb1 ID |
291 | struct bio_vec *copyup_bvecs; |
292 | u32 copyup_bvec_count; | |
bf0d5f50 AE |
293 | |
294 | struct ceph_osd_request *osd_req; | |
295 | ||
296 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 297 | int result; |
bf0d5f50 AE |
298 | |
299 | rbd_obj_callback_t callback; | |
300 | ||
301 | struct kref kref; | |
302 | }; | |
303 | ||
0c425248 | 304 | enum img_req_flags { |
9849e986 | 305 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 306 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
307 | }; |
308 | ||
bf0d5f50 | 309 | struct rbd_img_request { |
bf0d5f50 | 310 | struct rbd_device *rbd_dev; |
9bb0248d | 311 | enum obj_operation_type op_type; |
bf0d5f50 AE |
312 | u64 offset; /* starting image byte offset */ |
313 | u64 length; /* byte count from offset */ | |
0c425248 | 314 | unsigned long flags; |
bf0d5f50 | 315 | union { |
9849e986 | 316 | u64 snap_id; /* for reads */ |
bf0d5f50 | 317 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
318 | }; |
319 | union { | |
320 | struct request *rq; /* block request */ | |
321 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 AE |
322 | }; |
323 | spinlock_t completion_lock;/* protects next_completion */ | |
324 | u32 next_completion; | |
325 | rbd_img_callback_t callback; | |
55f27e09 | 326 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 327 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
328 | |
329 | u32 obj_request_count; | |
330 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
331 | ||
332 | struct kref kref; | |
333 | }; | |
334 | ||
335 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 336 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 337 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 338 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 339 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 340 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 341 | |
99d16943 ID |
342 | enum rbd_watch_state { |
343 | RBD_WATCH_STATE_UNREGISTERED, | |
344 | RBD_WATCH_STATE_REGISTERED, | |
345 | RBD_WATCH_STATE_ERROR, | |
346 | }; | |
347 | ||
ed95b21a ID |
348 | enum rbd_lock_state { |
349 | RBD_LOCK_STATE_UNLOCKED, | |
350 | RBD_LOCK_STATE_LOCKED, | |
351 | RBD_LOCK_STATE_RELEASING, | |
352 | }; | |
353 | ||
354 | /* WatchNotify::ClientId */ | |
355 | struct rbd_client_id { | |
356 | u64 gid; | |
357 | u64 handle; | |
358 | }; | |
359 | ||
f84344f3 | 360 | struct rbd_mapping { |
99c1f08f | 361 | u64 size; |
34b13184 | 362 | u64 features; |
f84344f3 AE |
363 | }; |
364 | ||
602adf40 YS |
365 | /* |
366 | * a single device | |
367 | */ | |
368 | struct rbd_device { | |
de71a297 | 369 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
370 | |
371 | int major; /* blkdev assigned major */ | |
dd82fff1 | 372 | int minor; |
602adf40 | 373 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 374 | |
a30b71b9 | 375 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
376 | struct rbd_client *rbd_client; |
377 | ||
378 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
379 | ||
b82d167b | 380 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
381 | |
382 | struct rbd_image_header header; | |
b82d167b | 383 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 384 | struct rbd_spec *spec; |
d147543d | 385 | struct rbd_options *opts; |
0d6d1e9c | 386 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 387 | |
c41d13a3 | 388 | struct ceph_object_id header_oid; |
922dab61 | 389 | struct ceph_object_locator header_oloc; |
971f839a | 390 | |
1643dfa4 | 391 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 392 | |
99d16943 ID |
393 | struct mutex watch_mutex; |
394 | enum rbd_watch_state watch_state; | |
922dab61 | 395 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
396 | u64 watch_cookie; |
397 | struct delayed_work watch_dwork; | |
59c2be1e | 398 | |
ed95b21a ID |
399 | struct rw_semaphore lock_rwsem; |
400 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 401 | char lock_cookie[32]; |
ed95b21a ID |
402 | struct rbd_client_id owner_cid; |
403 | struct work_struct acquired_lock_work; | |
404 | struct work_struct released_lock_work; | |
405 | struct delayed_work lock_dwork; | |
406 | struct work_struct unlock_work; | |
407 | wait_queue_head_t lock_waitq; | |
408 | ||
1643dfa4 | 409 | struct workqueue_struct *task_wq; |
59c2be1e | 410 | |
86b00e0d AE |
411 | struct rbd_spec *parent_spec; |
412 | u64 parent_overlap; | |
a2acd00e | 413 | atomic_t parent_ref; |
2f82ee54 | 414 | struct rbd_device *parent; |
86b00e0d | 415 | |
7ad18afa CH |
416 | /* Block layer tags. */ |
417 | struct blk_mq_tag_set tag_set; | |
418 | ||
c666601a JD |
419 | /* protects updating the header */ |
420 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
421 | |
422 | struct rbd_mapping mapping; | |
602adf40 YS |
423 | |
424 | struct list_head node; | |
dfc5606d | 425 | |
dfc5606d YS |
426 | /* sysfs related */ |
427 | struct device dev; | |
b82d167b | 428 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
429 | }; |
430 | ||
b82d167b | 431 | /* |
87c0fded ID |
432 | * Flag bits for rbd_dev->flags: |
433 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
434 | * by rbd_dev->lock | |
435 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 436 | */ |
6d292906 AE |
437 | enum rbd_dev_flags { |
438 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 439 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 440 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
441 | }; |
442 | ||
cfbf6377 | 443 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 444 | |
602adf40 | 445 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
446 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
447 | ||
432b8587 AE |
448 | static LIST_HEAD(rbd_client_list); /* clients */ |
449 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 450 | |
78c2a44a AE |
451 | /* Slab caches for frequently-allocated structures */ |
452 | ||
1c2a9dfe | 453 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 454 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 455 | |
9b60e70b | 456 | static int rbd_major; |
f8a22fc2 ID |
457 | static DEFINE_IDA(rbd_dev_id_ida); |
458 | ||
f5ee37bd ID |
459 | static struct workqueue_struct *rbd_wq; |
460 | ||
9b60e70b | 461 | /* |
3cfa3b16 | 462 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 463 | */ |
3cfa3b16 | 464 | static bool single_major = true; |
9b60e70b | 465 | module_param(single_major, bool, S_IRUGO); |
3cfa3b16 | 466 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 467 | |
f0f8cef5 AE |
468 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
469 | size_t count); | |
470 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
471 | size_t count); | |
9b60e70b ID |
472 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
473 | size_t count); | |
474 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
475 | size_t count); | |
6d69bb53 | 476 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
a2acd00e | 477 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 478 | |
9b60e70b ID |
479 | static int rbd_dev_id_to_minor(int dev_id) |
480 | { | |
7e513d43 | 481 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
482 | } |
483 | ||
484 | static int minor_to_rbd_dev_id(int minor) | |
485 | { | |
7e513d43 | 486 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
487 | } |
488 | ||
ed95b21a ID |
489 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
490 | { | |
491 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
492 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
493 | } | |
494 | ||
495 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
496 | { | |
497 | bool is_lock_owner; | |
498 | ||
499 | down_read(&rbd_dev->lock_rwsem); | |
500 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
501 | up_read(&rbd_dev->lock_rwsem); | |
502 | return is_lock_owner; | |
503 | } | |
504 | ||
8767b293 ID |
505 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
506 | { | |
507 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
508 | } | |
509 | ||
b15a21dd GKH |
510 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
511 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
512 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
513 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
8767b293 | 514 | static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL); |
b15a21dd GKH |
515 | |
516 | static struct attribute *rbd_bus_attrs[] = { | |
517 | &bus_attr_add.attr, | |
518 | &bus_attr_remove.attr, | |
9b60e70b ID |
519 | &bus_attr_add_single_major.attr, |
520 | &bus_attr_remove_single_major.attr, | |
8767b293 | 521 | &bus_attr_supported_features.attr, |
b15a21dd | 522 | NULL, |
f0f8cef5 | 523 | }; |
92c76dc0 ID |
524 | |
525 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
526 | struct attribute *attr, int index) | |
527 | { | |
9b60e70b ID |
528 | if (!single_major && |
529 | (attr == &bus_attr_add_single_major.attr || | |
530 | attr == &bus_attr_remove_single_major.attr)) | |
531 | return 0; | |
532 | ||
92c76dc0 ID |
533 | return attr->mode; |
534 | } | |
535 | ||
536 | static const struct attribute_group rbd_bus_group = { | |
537 | .attrs = rbd_bus_attrs, | |
538 | .is_visible = rbd_bus_is_visible, | |
539 | }; | |
540 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
541 | |
542 | static struct bus_type rbd_bus_type = { | |
543 | .name = "rbd", | |
b15a21dd | 544 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
545 | }; |
546 | ||
547 | static void rbd_root_dev_release(struct device *dev) | |
548 | { | |
549 | } | |
550 | ||
551 | static struct device rbd_root_dev = { | |
552 | .init_name = "rbd", | |
553 | .release = rbd_root_dev_release, | |
554 | }; | |
555 | ||
06ecc6cb AE |
556 | static __printf(2, 3) |
557 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
558 | { | |
559 | struct va_format vaf; | |
560 | va_list args; | |
561 | ||
562 | va_start(args, fmt); | |
563 | vaf.fmt = fmt; | |
564 | vaf.va = &args; | |
565 | ||
566 | if (!rbd_dev) | |
567 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
568 | else if (rbd_dev->disk) | |
569 | printk(KERN_WARNING "%s: %s: %pV\n", | |
570 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
571 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
572 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
573 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
574 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
575 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
576 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
577 | else /* punt */ | |
578 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
579 | RBD_DRV_NAME, rbd_dev, &vaf); | |
580 | va_end(args); | |
581 | } | |
582 | ||
aafb230e AE |
583 | #ifdef RBD_DEBUG |
584 | #define rbd_assert(expr) \ | |
585 | if (unlikely(!(expr))) { \ | |
586 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
587 | "at line %d:\n\n" \ | |
588 | "\trbd_assert(%s);\n\n", \ | |
589 | __func__, __LINE__, #expr); \ | |
590 | BUG(); \ | |
591 | } | |
592 | #else /* !RBD_DEBUG */ | |
593 | # define rbd_assert(expr) ((void) 0) | |
594 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 595 | |
05a46afd | 596 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 597 | |
cc4a38bd | 598 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 599 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 600 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 601 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
602 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
603 | u64 snap_id); | |
2ad3d716 AE |
604 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
605 | u8 *order, u64 *snap_size); | |
606 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
607 | u64 *snap_features); | |
59c2be1e | 608 | |
602adf40 YS |
609 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
610 | { | |
f0f8cef5 | 611 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 612 | bool removing = false; |
602adf40 | 613 | |
a14ea269 | 614 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
615 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
616 | removing = true; | |
617 | else | |
618 | rbd_dev->open_count++; | |
a14ea269 | 619 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
620 | if (removing) |
621 | return -ENOENT; | |
622 | ||
c3e946ce | 623 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 624 | |
602adf40 YS |
625 | return 0; |
626 | } | |
627 | ||
db2a144b | 628 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
629 | { |
630 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
631 | unsigned long open_count_before; |
632 | ||
a14ea269 | 633 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 634 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 635 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 636 | rbd_assert(open_count_before > 0); |
dfc5606d | 637 | |
c3e946ce | 638 | put_device(&rbd_dev->dev); |
dfc5606d YS |
639 | } |
640 | ||
131fd9f6 GZ |
641 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
642 | { | |
1de797bb | 643 | int ro; |
131fd9f6 | 644 | |
1de797bb | 645 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
646 | return -EFAULT; |
647 | ||
1de797bb | 648 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
649 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
650 | return -EROFS; | |
651 | ||
1de797bb ID |
652 | /* Let blkdev_roset() handle it */ |
653 | return -ENOTTY; | |
131fd9f6 GZ |
654 | } |
655 | ||
656 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
657 | unsigned int cmd, unsigned long arg) | |
658 | { | |
659 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 660 | int ret; |
131fd9f6 | 661 | |
131fd9f6 GZ |
662 | switch (cmd) { |
663 | case BLKROSET: | |
664 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
665 | break; | |
666 | default: | |
667 | ret = -ENOTTY; | |
668 | } | |
669 | ||
131fd9f6 GZ |
670 | return ret; |
671 | } | |
672 | ||
673 | #ifdef CONFIG_COMPAT | |
674 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
675 | unsigned int cmd, unsigned long arg) | |
676 | { | |
677 | return rbd_ioctl(bdev, mode, cmd, arg); | |
678 | } | |
679 | #endif /* CONFIG_COMPAT */ | |
680 | ||
602adf40 YS |
681 | static const struct block_device_operations rbd_bd_ops = { |
682 | .owner = THIS_MODULE, | |
683 | .open = rbd_open, | |
dfc5606d | 684 | .release = rbd_release, |
131fd9f6 GZ |
685 | .ioctl = rbd_ioctl, |
686 | #ifdef CONFIG_COMPAT | |
687 | .compat_ioctl = rbd_compat_ioctl, | |
688 | #endif | |
602adf40 YS |
689 | }; |
690 | ||
691 | /* | |
7262cfca | 692 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 693 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 694 | */ |
f8c38929 | 695 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
696 | { |
697 | struct rbd_client *rbdc; | |
698 | int ret = -ENOMEM; | |
699 | ||
37206ee5 | 700 | dout("%s:\n", __func__); |
602adf40 YS |
701 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
702 | if (!rbdc) | |
703 | goto out_opt; | |
704 | ||
705 | kref_init(&rbdc->kref); | |
706 | INIT_LIST_HEAD(&rbdc->node); | |
707 | ||
74da4a0f | 708 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 709 | if (IS_ERR(rbdc->client)) |
08f75463 | 710 | goto out_rbdc; |
43ae4701 | 711 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
712 | |
713 | ret = ceph_open_session(rbdc->client); | |
714 | if (ret < 0) | |
08f75463 | 715 | goto out_client; |
602adf40 | 716 | |
432b8587 | 717 | spin_lock(&rbd_client_list_lock); |
602adf40 | 718 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 719 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 720 | |
37206ee5 | 721 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 722 | |
602adf40 | 723 | return rbdc; |
08f75463 | 724 | out_client: |
602adf40 | 725 | ceph_destroy_client(rbdc->client); |
08f75463 | 726 | out_rbdc: |
602adf40 YS |
727 | kfree(rbdc); |
728 | out_opt: | |
43ae4701 AE |
729 | if (ceph_opts) |
730 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
731 | dout("%s: error %d\n", __func__, ret); |
732 | ||
28f259b7 | 733 | return ERR_PTR(ret); |
602adf40 YS |
734 | } |
735 | ||
2f82ee54 AE |
736 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
737 | { | |
738 | kref_get(&rbdc->kref); | |
739 | ||
740 | return rbdc; | |
741 | } | |
742 | ||
602adf40 | 743 | /* |
1f7ba331 AE |
744 | * Find a ceph client with specific addr and configuration. If |
745 | * found, bump its reference count. | |
602adf40 | 746 | */ |
1f7ba331 | 747 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
748 | { |
749 | struct rbd_client *client_node; | |
1f7ba331 | 750 | bool found = false; |
602adf40 | 751 | |
43ae4701 | 752 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
753 | return NULL; |
754 | ||
1f7ba331 AE |
755 | spin_lock(&rbd_client_list_lock); |
756 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
757 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
758 | __rbd_get_client(client_node); |
759 | ||
1f7ba331 AE |
760 | found = true; |
761 | break; | |
762 | } | |
763 | } | |
764 | spin_unlock(&rbd_client_list_lock); | |
765 | ||
766 | return found ? client_node : NULL; | |
602adf40 YS |
767 | } |
768 | ||
59c2be1e | 769 | /* |
210c104c | 770 | * (Per device) rbd map options |
59c2be1e YS |
771 | */ |
772 | enum { | |
b5584180 | 773 | Opt_queue_depth, |
59c2be1e YS |
774 | Opt_last_int, |
775 | /* int args above */ | |
776 | Opt_last_string, | |
777 | /* string args above */ | |
cc0538b6 AE |
778 | Opt_read_only, |
779 | Opt_read_write, | |
80de1912 | 780 | Opt_lock_on_read, |
e010dd0a | 781 | Opt_exclusive, |
210c104c | 782 | Opt_err |
59c2be1e YS |
783 | }; |
784 | ||
43ae4701 | 785 | static match_table_t rbd_opts_tokens = { |
b5584180 | 786 | {Opt_queue_depth, "queue_depth=%d"}, |
59c2be1e YS |
787 | /* int args above */ |
788 | /* string args above */ | |
be466c1c | 789 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
790 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
791 | {Opt_read_write, "read_write"}, | |
792 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 793 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 794 | {Opt_exclusive, "exclusive"}, |
210c104c | 795 | {Opt_err, NULL} |
59c2be1e YS |
796 | }; |
797 | ||
98571b5a | 798 | struct rbd_options { |
b5584180 | 799 | int queue_depth; |
98571b5a | 800 | bool read_only; |
80de1912 | 801 | bool lock_on_read; |
e010dd0a | 802 | bool exclusive; |
98571b5a AE |
803 | }; |
804 | ||
b5584180 | 805 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
98571b5a | 806 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 807 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 808 | #define RBD_EXCLUSIVE_DEFAULT false |
98571b5a | 809 | |
59c2be1e YS |
810 | static int parse_rbd_opts_token(char *c, void *private) |
811 | { | |
43ae4701 | 812 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
813 | substring_t argstr[MAX_OPT_ARGS]; |
814 | int token, intval, ret; | |
815 | ||
43ae4701 | 816 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
817 | if (token < Opt_last_int) { |
818 | ret = match_int(&argstr[0], &intval); | |
819 | if (ret < 0) { | |
210c104c | 820 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
821 | return ret; |
822 | } | |
823 | dout("got int token %d val %d\n", token, intval); | |
824 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 825 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
826 | } else { |
827 | dout("got token %d\n", token); | |
828 | } | |
829 | ||
830 | switch (token) { | |
b5584180 ID |
831 | case Opt_queue_depth: |
832 | if (intval < 1) { | |
833 | pr_err("queue_depth out of range\n"); | |
834 | return -EINVAL; | |
835 | } | |
836 | rbd_opts->queue_depth = intval; | |
837 | break; | |
cc0538b6 AE |
838 | case Opt_read_only: |
839 | rbd_opts->read_only = true; | |
840 | break; | |
841 | case Opt_read_write: | |
842 | rbd_opts->read_only = false; | |
843 | break; | |
80de1912 ID |
844 | case Opt_lock_on_read: |
845 | rbd_opts->lock_on_read = true; | |
846 | break; | |
e010dd0a ID |
847 | case Opt_exclusive: |
848 | rbd_opts->exclusive = true; | |
849 | break; | |
59c2be1e | 850 | default: |
210c104c ID |
851 | /* libceph prints "bad option" msg */ |
852 | return -EINVAL; | |
59c2be1e | 853 | } |
210c104c | 854 | |
59c2be1e YS |
855 | return 0; |
856 | } | |
857 | ||
6d2940c8 GZ |
858 | static char* obj_op_name(enum obj_operation_type op_type) |
859 | { | |
860 | switch (op_type) { | |
861 | case OBJ_OP_READ: | |
862 | return "read"; | |
863 | case OBJ_OP_WRITE: | |
864 | return "write"; | |
90e98c52 GZ |
865 | case OBJ_OP_DISCARD: |
866 | return "discard"; | |
6d2940c8 GZ |
867 | default: |
868 | return "???"; | |
869 | } | |
870 | } | |
871 | ||
602adf40 YS |
872 | /* |
873 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
874 | * not exist create it. Either way, ceph_opts is consumed by this |
875 | * function. | |
602adf40 | 876 | */ |
9d3997fd | 877 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 878 | { |
f8c38929 | 879 | struct rbd_client *rbdc; |
59c2be1e | 880 | |
cfbf6377 | 881 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 882 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 883 | if (rbdc) /* using an existing client */ |
43ae4701 | 884 | ceph_destroy_options(ceph_opts); |
9d3997fd | 885 | else |
f8c38929 | 886 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 887 | mutex_unlock(&client_mutex); |
602adf40 | 888 | |
9d3997fd | 889 | return rbdc; |
602adf40 YS |
890 | } |
891 | ||
892 | /* | |
893 | * Destroy ceph client | |
d23a4b3f | 894 | * |
432b8587 | 895 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
896 | */ |
897 | static void rbd_client_release(struct kref *kref) | |
898 | { | |
899 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
900 | ||
37206ee5 | 901 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 902 | spin_lock(&rbd_client_list_lock); |
602adf40 | 903 | list_del(&rbdc->node); |
cd9d9f5d | 904 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
905 | |
906 | ceph_destroy_client(rbdc->client); | |
907 | kfree(rbdc); | |
908 | } | |
909 | ||
910 | /* | |
911 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
912 | * it. | |
913 | */ | |
9d3997fd | 914 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 915 | { |
c53d5893 AE |
916 | if (rbdc) |
917 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
918 | } |
919 | ||
a30b71b9 AE |
920 | static bool rbd_image_format_valid(u32 image_format) |
921 | { | |
922 | return image_format == 1 || image_format == 2; | |
923 | } | |
924 | ||
8e94af8e AE |
925 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
926 | { | |
103a150f AE |
927 | size_t size; |
928 | u32 snap_count; | |
929 | ||
930 | /* The header has to start with the magic rbd header text */ | |
931 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
932 | return false; | |
933 | ||
db2388b6 AE |
934 | /* The bio layer requires at least sector-sized I/O */ |
935 | ||
936 | if (ondisk->options.order < SECTOR_SHIFT) | |
937 | return false; | |
938 | ||
939 | /* If we use u64 in a few spots we may be able to loosen this */ | |
940 | ||
941 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
942 | return false; | |
943 | ||
103a150f AE |
944 | /* |
945 | * The size of a snapshot header has to fit in a size_t, and | |
946 | * that limits the number of snapshots. | |
947 | */ | |
948 | snap_count = le32_to_cpu(ondisk->snap_count); | |
949 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
950 | if (snap_count > size / sizeof (__le64)) | |
951 | return false; | |
952 | ||
953 | /* | |
954 | * Not only that, but the size of the entire the snapshot | |
955 | * header must also be representable in a size_t. | |
956 | */ | |
957 | size -= snap_count * sizeof (__le64); | |
958 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
959 | return false; | |
960 | ||
961 | return true; | |
8e94af8e AE |
962 | } |
963 | ||
5bc3fb17 ID |
964 | /* |
965 | * returns the size of an object in the image | |
966 | */ | |
967 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
968 | { | |
969 | return 1U << header->obj_order; | |
970 | } | |
971 | ||
263423f8 ID |
972 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
973 | { | |
974 | if (rbd_dev->header.stripe_unit == 0 || | |
975 | rbd_dev->header.stripe_count == 0) { | |
976 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
977 | rbd_dev->header.stripe_count = 1; | |
978 | } | |
979 | ||
980 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
981 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
982 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
983 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
984 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
985 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
986 | } | |
987 | ||
602adf40 | 988 | /* |
bb23e37a AE |
989 | * Fill an rbd image header with information from the given format 1 |
990 | * on-disk header. | |
602adf40 | 991 | */ |
662518b1 | 992 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 993 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 994 | { |
662518b1 | 995 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
996 | bool first_time = header->object_prefix == NULL; |
997 | struct ceph_snap_context *snapc; | |
998 | char *object_prefix = NULL; | |
999 | char *snap_names = NULL; | |
1000 | u64 *snap_sizes = NULL; | |
ccece235 | 1001 | u32 snap_count; |
bb23e37a | 1002 | int ret = -ENOMEM; |
621901d6 | 1003 | u32 i; |
602adf40 | 1004 | |
bb23e37a | 1005 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1006 | |
bb23e37a | 1007 | if (first_time) { |
848d796c ID |
1008 | object_prefix = kstrndup(ondisk->object_prefix, |
1009 | sizeof(ondisk->object_prefix), | |
1010 | GFP_KERNEL); | |
bb23e37a AE |
1011 | if (!object_prefix) |
1012 | return -ENOMEM; | |
bb23e37a | 1013 | } |
00f1f36f | 1014 | |
bb23e37a | 1015 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1016 | |
bb23e37a AE |
1017 | snap_count = le32_to_cpu(ondisk->snap_count); |
1018 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1019 | if (!snapc) | |
1020 | goto out_err; | |
1021 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1022 | if (snap_count) { |
bb23e37a | 1023 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1024 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1025 | ||
bb23e37a | 1026 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1027 | |
bb23e37a AE |
1028 | if (snap_names_len > (u64)SIZE_MAX) |
1029 | goto out_2big; | |
1030 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1031 | if (!snap_names) | |
6a52325f AE |
1032 | goto out_err; |
1033 | ||
bb23e37a | 1034 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1035 | snap_sizes = kmalloc_array(snap_count, |
1036 | sizeof(*header->snap_sizes), | |
1037 | GFP_KERNEL); | |
bb23e37a | 1038 | if (!snap_sizes) |
6a52325f | 1039 | goto out_err; |
bb23e37a | 1040 | |
f785cc1d | 1041 | /* |
bb23e37a AE |
1042 | * Copy the names, and fill in each snapshot's id |
1043 | * and size. | |
1044 | * | |
99a41ebc | 1045 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1046 | * ondisk buffer we're working with has |
f785cc1d AE |
1047 | * snap_names_len bytes beyond the end of the |
1048 | * snapshot id array, this memcpy() is safe. | |
1049 | */ | |
bb23e37a AE |
1050 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1051 | snaps = ondisk->snaps; | |
1052 | for (i = 0; i < snap_count; i++) { | |
1053 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1054 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1055 | } | |
602adf40 | 1056 | } |
6a52325f | 1057 | |
bb23e37a | 1058 | /* We won't fail any more, fill in the header */ |
621901d6 | 1059 | |
bb23e37a AE |
1060 | if (first_time) { |
1061 | header->object_prefix = object_prefix; | |
1062 | header->obj_order = ondisk->options.order; | |
263423f8 | 1063 | rbd_init_layout(rbd_dev); |
602adf40 | 1064 | } else { |
662518b1 AE |
1065 | ceph_put_snap_context(header->snapc); |
1066 | kfree(header->snap_names); | |
1067 | kfree(header->snap_sizes); | |
602adf40 | 1068 | } |
849b4260 | 1069 | |
bb23e37a | 1070 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1071 | |
f84344f3 | 1072 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1073 | header->snapc = snapc; |
1074 | header->snap_names = snap_names; | |
1075 | header->snap_sizes = snap_sizes; | |
468521c1 | 1076 | |
602adf40 | 1077 | return 0; |
bb23e37a AE |
1078 | out_2big: |
1079 | ret = -EIO; | |
6a52325f | 1080 | out_err: |
bb23e37a AE |
1081 | kfree(snap_sizes); |
1082 | kfree(snap_names); | |
1083 | ceph_put_snap_context(snapc); | |
1084 | kfree(object_prefix); | |
ccece235 | 1085 | |
bb23e37a | 1086 | return ret; |
602adf40 YS |
1087 | } |
1088 | ||
9682fc6d AE |
1089 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1090 | { | |
1091 | const char *snap_name; | |
1092 | ||
1093 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1094 | ||
1095 | /* Skip over names until we find the one we are looking for */ | |
1096 | ||
1097 | snap_name = rbd_dev->header.snap_names; | |
1098 | while (which--) | |
1099 | snap_name += strlen(snap_name) + 1; | |
1100 | ||
1101 | return kstrdup(snap_name, GFP_KERNEL); | |
1102 | } | |
1103 | ||
30d1cff8 AE |
1104 | /* |
1105 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1106 | * Note that result is for snapshots in *descending* order. | |
1107 | */ | |
1108 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1109 | { | |
1110 | u64 snap_id1 = *(u64 *)s1; | |
1111 | u64 snap_id2 = *(u64 *)s2; | |
1112 | ||
1113 | if (snap_id1 < snap_id2) | |
1114 | return 1; | |
1115 | return snap_id1 == snap_id2 ? 0 : -1; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Search a snapshot context to see if the given snapshot id is | |
1120 | * present. | |
1121 | * | |
1122 | * Returns the position of the snapshot id in the array if it's found, | |
1123 | * or BAD_SNAP_INDEX otherwise. | |
1124 | * | |
1125 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1126 | * reverse order, highest snapshot id first. | |
1127 | */ | |
9682fc6d AE |
1128 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1129 | { | |
1130 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1131 | u64 *found; |
9682fc6d | 1132 | |
30d1cff8 AE |
1133 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1134 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1135 | |
30d1cff8 | 1136 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1137 | } |
1138 | ||
2ad3d716 AE |
1139 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1140 | u64 snap_id) | |
9e15b77d | 1141 | { |
54cac61f | 1142 | u32 which; |
da6a6b63 | 1143 | const char *snap_name; |
9e15b77d | 1144 | |
54cac61f AE |
1145 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1146 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1147 | return ERR_PTR(-ENOENT); |
54cac61f | 1148 | |
da6a6b63 JD |
1149 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1150 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1151 | } |
1152 | ||
1153 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1154 | { | |
9e15b77d AE |
1155 | if (snap_id == CEPH_NOSNAP) |
1156 | return RBD_SNAP_HEAD_NAME; | |
1157 | ||
54cac61f AE |
1158 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1159 | if (rbd_dev->image_format == 1) | |
1160 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1161 | |
54cac61f | 1162 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1163 | } |
1164 | ||
2ad3d716 AE |
1165 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1166 | u64 *snap_size) | |
602adf40 | 1167 | { |
2ad3d716 AE |
1168 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1169 | if (snap_id == CEPH_NOSNAP) { | |
1170 | *snap_size = rbd_dev->header.image_size; | |
1171 | } else if (rbd_dev->image_format == 1) { | |
1172 | u32 which; | |
602adf40 | 1173 | |
2ad3d716 AE |
1174 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1175 | if (which == BAD_SNAP_INDEX) | |
1176 | return -ENOENT; | |
e86924a8 | 1177 | |
2ad3d716 AE |
1178 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1179 | } else { | |
1180 | u64 size = 0; | |
1181 | int ret; | |
1182 | ||
1183 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1184 | if (ret) | |
1185 | return ret; | |
1186 | ||
1187 | *snap_size = size; | |
1188 | } | |
1189 | return 0; | |
602adf40 YS |
1190 | } |
1191 | ||
2ad3d716 AE |
1192 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1193 | u64 *snap_features) | |
602adf40 | 1194 | { |
2ad3d716 AE |
1195 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1196 | if (snap_id == CEPH_NOSNAP) { | |
1197 | *snap_features = rbd_dev->header.features; | |
1198 | } else if (rbd_dev->image_format == 1) { | |
1199 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1200 | } else { |
2ad3d716 AE |
1201 | u64 features = 0; |
1202 | int ret; | |
8b0241f8 | 1203 | |
2ad3d716 AE |
1204 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1205 | if (ret) | |
1206 | return ret; | |
1207 | ||
1208 | *snap_features = features; | |
1209 | } | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1214 | { | |
8f4b7d98 | 1215 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1216 | u64 size = 0; |
1217 | u64 features = 0; | |
1218 | int ret; | |
1219 | ||
2ad3d716 AE |
1220 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1221 | if (ret) | |
1222 | return ret; | |
1223 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1224 | if (ret) | |
1225 | return ret; | |
1226 | ||
1227 | rbd_dev->mapping.size = size; | |
1228 | rbd_dev->mapping.features = features; | |
1229 | ||
8b0241f8 | 1230 | return 0; |
602adf40 YS |
1231 | } |
1232 | ||
d1cf5788 AE |
1233 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1234 | { | |
1235 | rbd_dev->mapping.size = 0; | |
1236 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1237 | } |
1238 | ||
65ccfe21 AE |
1239 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1240 | { | |
5bc3fb17 | 1241 | u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
602adf40 | 1242 | |
65ccfe21 AE |
1243 | return offset & (segment_size - 1); |
1244 | } | |
1245 | ||
1246 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1247 | u64 offset, u64 length) | |
1248 | { | |
5bc3fb17 | 1249 | u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
65ccfe21 AE |
1250 | |
1251 | offset &= segment_size - 1; | |
1252 | ||
aafb230e | 1253 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1254 | if (offset + length > segment_size) |
1255 | length = segment_size - offset; | |
1256 | ||
1257 | return length; | |
602adf40 YS |
1258 | } |
1259 | ||
5359a17d ID |
1260 | static void zero_bvec(struct bio_vec *bv) |
1261 | { | |
1262 | void *buf; | |
1263 | unsigned long flags; | |
1264 | ||
1265 | buf = bvec_kmap_irq(bv, &flags); | |
1266 | memset(buf, 0, bv->bv_len); | |
1267 | flush_dcache_page(bv->bv_page); | |
1268 | bvec_kunmap_irq(buf, &flags); | |
1269 | } | |
1270 | ||
1271 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) | |
1272 | { | |
1273 | struct ceph_bio_iter it = *bio_pos; | |
1274 | ||
1275 | ceph_bio_iter_advance(&it, off); | |
1276 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1277 | zero_bvec(&bv); | |
1278 | })); | |
1279 | } | |
1280 | ||
7e07efb1 ID |
1281 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
1282 | { | |
1283 | struct ceph_bvec_iter it = *bvec_pos; | |
1284 | ||
1285 | ceph_bvec_iter_advance(&it, off); | |
1286 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1287 | zero_bvec(&bv); | |
1288 | })); | |
b9434c5b AE |
1289 | } |
1290 | ||
3da691bf ID |
1291 | /* |
1292 | * Zero a range in @obj_req data buffer defined by a bio (list) or | |
1293 | * bio_vec array. | |
1294 | * | |
1295 | * @off is relative to the start of the data buffer. | |
1296 | */ | |
1297 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, | |
1298 | u32 bytes) | |
1299 | { | |
1300 | switch (obj_req->type) { | |
1301 | case OBJ_REQUEST_BIO: | |
1302 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1303 | break; | |
1304 | case OBJ_REQUEST_BVECS: | |
1305 | zero_bvecs(&obj_req->bvec_pos, off, bytes); | |
1306 | break; | |
1307 | default: | |
1308 | rbd_assert(0); | |
1309 | } | |
1310 | } | |
1311 | ||
926f9b3f AE |
1312 | /* |
1313 | * The default/initial value for all object request flags is 0. For | |
1314 | * each flag, once its value is set to 1 it is never reset to 0 | |
1315 | * again. | |
1316 | */ | |
57acbaa7 | 1317 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1318 | { |
57acbaa7 | 1319 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1320 | struct rbd_device *rbd_dev; |
1321 | ||
57acbaa7 | 1322 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1323 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1324 | obj_request); |
1325 | } | |
1326 | } | |
1327 | ||
57acbaa7 | 1328 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1329 | { |
1330 | smp_mb(); | |
57acbaa7 | 1331 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1332 | } |
1333 | ||
57acbaa7 | 1334 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1335 | { |
57acbaa7 AE |
1336 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1337 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1338 | |
57acbaa7 AE |
1339 | if (obj_request_img_data_test(obj_request)) |
1340 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1341 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1342 | obj_request); |
1343 | } | |
1344 | } | |
1345 | ||
57acbaa7 | 1346 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1347 | { |
1348 | smp_mb(); | |
57acbaa7 | 1349 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1350 | } |
1351 | ||
9638556a ID |
1352 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1353 | { | |
1354 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1355 | ||
1356 | return obj_request->img_offset < | |
1357 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1358 | } | |
1359 | ||
bf0d5f50 AE |
1360 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1361 | { | |
37206ee5 | 1362 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1363 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1364 | kref_get(&obj_request->kref); |
1365 | } | |
1366 | ||
1367 | static void rbd_obj_request_destroy(struct kref *kref); | |
1368 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1369 | { | |
1370 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1371 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1372 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1373 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1374 | } | |
1375 | ||
0f2d5be7 AE |
1376 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1377 | { | |
1378 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1379 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1380 | kref_get(&img_request->kref); |
1381 | } | |
1382 | ||
e93f3152 AE |
1383 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1384 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1385 | static void rbd_img_request_destroy(struct kref *kref); |
1386 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1387 | { | |
1388 | rbd_assert(img_request != NULL); | |
37206ee5 | 1389 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1390 | kref_read(&img_request->kref)); |
e93f3152 AE |
1391 | if (img_request_child_test(img_request)) |
1392 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1393 | else | |
1394 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1395 | } |
1396 | ||
1397 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1398 | struct rbd_obj_request *obj_request) | |
1399 | { | |
25dcf954 AE |
1400 | rbd_assert(obj_request->img_request == NULL); |
1401 | ||
b155e86c | 1402 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1403 | obj_request->img_request = img_request; |
25dcf954 | 1404 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1405 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1406 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1407 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1408 | img_request->obj_request_count++; |
1409 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1410 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1411 | obj_request->which); | |
bf0d5f50 AE |
1412 | } |
1413 | ||
1414 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1415 | struct rbd_obj_request *obj_request) | |
1416 | { | |
1417 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1418 | |
37206ee5 AE |
1419 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1420 | obj_request->which); | |
bf0d5f50 | 1421 | list_del(&obj_request->links); |
25dcf954 AE |
1422 | rbd_assert(img_request->obj_request_count > 0); |
1423 | img_request->obj_request_count--; | |
1424 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1425 | obj_request->which = BAD_WHICH; | |
6365d33a | 1426 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1427 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1428 | obj_request->img_request = NULL; |
25dcf954 | 1429 | obj_request->callback = NULL; |
bf0d5f50 AE |
1430 | rbd_obj_request_put(obj_request); |
1431 | } | |
1432 | ||
1433 | static bool obj_request_type_valid(enum obj_request_type type) | |
1434 | { | |
1435 | switch (type) { | |
9969ebc5 | 1436 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1437 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1438 | case OBJ_REQUEST_BVECS: |
bf0d5f50 AE |
1439 | return true; |
1440 | default: | |
1441 | return false; | |
1442 | } | |
1443 | } | |
1444 | ||
4a17dadc ID |
1445 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request); |
1446 | ||
980917fc | 1447 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1448 | { |
980917fc ID |
1449 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1450 | ||
a90bb0c1 ID |
1451 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
1452 | obj_request, obj_request->object_no, obj_request->offset, | |
67e2b652 | 1453 | obj_request->length, osd_req); |
4a17dadc ID |
1454 | if (obj_request_img_data_test(obj_request)) { |
1455 | WARN_ON(obj_request->callback != rbd_img_obj_callback); | |
1456 | rbd_img_request_get(obj_request->img_request); | |
1457 | } | |
980917fc | 1458 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1459 | } |
1460 | ||
1461 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1462 | { | |
55f27e09 | 1463 | |
37206ee5 | 1464 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1465 | |
1466 | /* | |
1467 | * If no error occurred, compute the aggregate transfer | |
1468 | * count for the image request. We could instead use | |
1469 | * atomic64_cmpxchg() to update it as each object request | |
1470 | * completes; not clear which way is better off hand. | |
1471 | */ | |
1472 | if (!img_request->result) { | |
1473 | struct rbd_obj_request *obj_request; | |
1474 | u64 xferred = 0; | |
1475 | ||
1476 | for_each_obj_request(img_request, obj_request) | |
1477 | xferred += obj_request->xferred; | |
1478 | img_request->xferred = xferred; | |
1479 | } | |
1480 | ||
bf0d5f50 AE |
1481 | if (img_request->callback) |
1482 | img_request->callback(img_request); | |
1483 | else | |
1484 | rbd_img_request_put(img_request); | |
1485 | } | |
1486 | ||
0c425248 AE |
1487 | /* |
1488 | * The default/initial value for all image request flags is 0. Each | |
1489 | * is conditionally set to 1 at image request initialization time | |
1490 | * and currently never change thereafter. | |
1491 | */ | |
9849e986 AE |
1492 | static void img_request_child_set(struct rbd_img_request *img_request) |
1493 | { | |
1494 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1495 | smp_mb(); | |
1496 | } | |
1497 | ||
e93f3152 AE |
1498 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1499 | { | |
1500 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1501 | smp_mb(); | |
1502 | } | |
1503 | ||
9849e986 AE |
1504 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1505 | { | |
1506 | smp_mb(); | |
1507 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1508 | } | |
1509 | ||
d0b2e944 AE |
1510 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1511 | { | |
1512 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1513 | smp_mb(); | |
1514 | } | |
1515 | ||
a2acd00e AE |
1516 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1517 | { | |
1518 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1519 | smp_mb(); | |
1520 | } | |
1521 | ||
d0b2e944 AE |
1522 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1523 | { | |
1524 | smp_mb(); | |
1525 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1526 | } | |
1527 | ||
3da691bf ID |
1528 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
1529 | { | |
1530 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1531 | ||
1532 | return !obj_req->offset && | |
1533 | obj_req->length == rbd_dev->layout.object_size; | |
1534 | } | |
1535 | ||
1536 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) | |
1537 | { | |
1538 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1539 | ||
1540 | return obj_req->offset + obj_req->length == | |
1541 | rbd_dev->layout.object_size; | |
1542 | } | |
1543 | ||
1544 | static bool rbd_img_is_write(struct rbd_img_request *img_req) | |
1545 | { | |
9bb0248d | 1546 | switch (img_req->op_type) { |
3da691bf ID |
1547 | case OBJ_OP_READ: |
1548 | return false; | |
1549 | case OBJ_OP_WRITE: | |
1550 | case OBJ_OP_DISCARD: | |
1551 | return true; | |
1552 | default: | |
1553 | rbd_assert(0); | |
1554 | } | |
1555 | } | |
1556 | ||
bf0d5f50 AE |
1557 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1558 | { | |
37206ee5 AE |
1559 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1560 | obj_request->callback); | |
2e584bce | 1561 | obj_request->callback(obj_request); |
bf0d5f50 AE |
1562 | } |
1563 | ||
3da691bf ID |
1564 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); |
1565 | ||
85e084fe | 1566 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1567 | { |
3da691bf | 1568 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
bf0d5f50 | 1569 | |
3da691bf ID |
1570 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1571 | osd_req->r_result, obj_req); | |
1572 | rbd_assert(osd_req == obj_req->osd_req); | |
0ccd5926 | 1573 | |
3da691bf ID |
1574 | obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0; |
1575 | if (!obj_req->result && !rbd_img_is_write(obj_req->img_request)) | |
1576 | obj_req->xferred = osd_req->r_result; | |
1577 | else | |
1578 | /* | |
1579 | * Writes aren't allowed to return a data payload. In some | |
1580 | * guarded write cases (e.g. stat + zero on an empty object) | |
1581 | * a stat response makes it through, but we don't care. | |
1582 | */ | |
1583 | obj_req->xferred = 0; | |
bf0d5f50 | 1584 | |
3da691bf | 1585 | rbd_obj_handle_request(obj_req); |
bf0d5f50 AE |
1586 | } |
1587 | ||
9d4df01f | 1588 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1589 | { |
8c042b0d | 1590 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1591 | |
7c84883a | 1592 | rbd_assert(obj_request_img_data_test(obj_request)); |
a162b308 | 1593 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
7c84883a | 1594 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1595 | } |
1596 | ||
1597 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1598 | { | |
9d4df01f | 1599 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1600 | |
a162b308 | 1601 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
1134e091 | 1602 | ktime_get_real_ts(&osd_req->r_mtime); |
bb873b53 | 1603 | osd_req->r_data_offset = obj_request->offset; |
430c28c3 AE |
1604 | } |
1605 | ||
bc81207e | 1606 | static struct ceph_osd_request * |
a162b308 | 1607 | rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops) |
bc81207e | 1608 | { |
a162b308 ID |
1609 | struct rbd_img_request *img_req = obj_req->img_request; |
1610 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
bc81207e ID |
1611 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1612 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1613 | const char *name_format = rbd_dev->image_format == 1 ? |
1614 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e | 1615 | |
a162b308 ID |
1616 | req = ceph_osdc_alloc_request(osdc, |
1617 | (rbd_img_is_write(img_req) ? img_req->snapc : NULL), | |
1618 | num_ops, false, GFP_NOIO); | |
bc81207e ID |
1619 | if (!req) |
1620 | return NULL; | |
1621 | ||
bc81207e | 1622 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1623 | req->r_priv = obj_req; |
bc81207e ID |
1624 | |
1625 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; | |
a90bb0c1 | 1626 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
a162b308 | 1627 | rbd_dev->header.object_prefix, obj_req->object_no)) |
bc81207e ID |
1628 | goto err_req; |
1629 | ||
1630 | if (ceph_osdc_alloc_messages(req, GFP_NOIO)) | |
1631 | goto err_req; | |
1632 | ||
1633 | return req; | |
1634 | ||
1635 | err_req: | |
1636 | ceph_osdc_put_request(req); | |
1637 | return NULL; | |
1638 | } | |
1639 | ||
bf0d5f50 AE |
1640 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1641 | { | |
1642 | ceph_osdc_put_request(osd_req); | |
1643 | } | |
1644 | ||
6c696d85 ID |
1645 | static struct rbd_obj_request * |
1646 | rbd_obj_request_create(enum obj_request_type type) | |
bf0d5f50 AE |
1647 | { |
1648 | struct rbd_obj_request *obj_request; | |
bf0d5f50 AE |
1649 | |
1650 | rbd_assert(obj_request_type_valid(type)); | |
1651 | ||
5a60e876 | 1652 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1653 | if (!obj_request) |
f907ad55 | 1654 | return NULL; |
f907ad55 | 1655 | |
bf0d5f50 AE |
1656 | obj_request->which = BAD_WHICH; |
1657 | obj_request->type = type; | |
1658 | INIT_LIST_HEAD(&obj_request->links); | |
bf0d5f50 AE |
1659 | kref_init(&obj_request->kref); |
1660 | ||
67e2b652 | 1661 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1662 | return obj_request; |
1663 | } | |
1664 | ||
1665 | static void rbd_obj_request_destroy(struct kref *kref) | |
1666 | { | |
1667 | struct rbd_obj_request *obj_request; | |
7e07efb1 | 1668 | u32 i; |
bf0d5f50 AE |
1669 | |
1670 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1671 | ||
37206ee5 AE |
1672 | dout("%s: obj %p\n", __func__, obj_request); |
1673 | ||
bf0d5f50 AE |
1674 | rbd_assert(obj_request->img_request == NULL); |
1675 | rbd_assert(obj_request->which == BAD_WHICH); | |
1676 | ||
1677 | if (obj_request->osd_req) | |
1678 | rbd_osd_req_destroy(obj_request->osd_req); | |
1679 | ||
bf0d5f50 | 1680 | switch (obj_request->type) { |
9969ebc5 | 1681 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1682 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1683 | case OBJ_REQUEST_BVECS: |
5359a17d | 1684 | break; /* Nothing to do */ |
7e07efb1 ID |
1685 | default: |
1686 | rbd_assert(0); | |
bf0d5f50 AE |
1687 | } |
1688 | ||
7e07efb1 ID |
1689 | if (obj_request->copyup_bvecs) { |
1690 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1691 | if (obj_request->copyup_bvecs[i].bv_page) | |
1692 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1693 | } | |
1694 | kfree(obj_request->copyup_bvecs); | |
1695 | } | |
f9dcbc44 | 1696 | |
868311b1 | 1697 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1698 | } |
1699 | ||
fb65d228 AE |
1700 | /* It's OK to call this for a device with no parent */ |
1701 | ||
1702 | static void rbd_spec_put(struct rbd_spec *spec); | |
1703 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1704 | { | |
1705 | rbd_dev_remove_parent(rbd_dev); | |
1706 | rbd_spec_put(rbd_dev->parent_spec); | |
1707 | rbd_dev->parent_spec = NULL; | |
1708 | rbd_dev->parent_overlap = 0; | |
1709 | } | |
1710 | ||
a2acd00e AE |
1711 | /* |
1712 | * Parent image reference counting is used to determine when an | |
1713 | * image's parent fields can be safely torn down--after there are no | |
1714 | * more in-flight requests to the parent image. When the last | |
1715 | * reference is dropped, cleaning them up is safe. | |
1716 | */ | |
1717 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1718 | { | |
1719 | int counter; | |
1720 | ||
1721 | if (!rbd_dev->parent_spec) | |
1722 | return; | |
1723 | ||
1724 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1725 | if (counter > 0) | |
1726 | return; | |
1727 | ||
1728 | /* Last reference; clean up parent data structures */ | |
1729 | ||
1730 | if (!counter) | |
1731 | rbd_dev_unparent(rbd_dev); | |
1732 | else | |
9584d508 | 1733 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1734 | } |
1735 | ||
1736 | /* | |
1737 | * If an image has a non-zero parent overlap, get a reference to its | |
1738 | * parent. | |
1739 | * | |
1740 | * Returns true if the rbd device has a parent with a non-zero | |
1741 | * overlap and a reference for it was successfully taken, or | |
1742 | * false otherwise. | |
1743 | */ | |
1744 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1745 | { | |
ae43e9d0 | 1746 | int counter = 0; |
a2acd00e AE |
1747 | |
1748 | if (!rbd_dev->parent_spec) | |
1749 | return false; | |
1750 | ||
ae43e9d0 ID |
1751 | down_read(&rbd_dev->header_rwsem); |
1752 | if (rbd_dev->parent_overlap) | |
1753 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
1754 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
1755 | |
1756 | if (counter < 0) | |
9584d508 | 1757 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1758 | |
ae43e9d0 | 1759 | return counter > 0; |
a2acd00e AE |
1760 | } |
1761 | ||
bf0d5f50 AE |
1762 | /* |
1763 | * Caller is responsible for filling in the list of object requests | |
1764 | * that comprises the image request, and the Linux request pointer | |
1765 | * (if there is one). | |
1766 | */ | |
cc344fa1 AE |
1767 | static struct rbd_img_request *rbd_img_request_create( |
1768 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1769 | u64 offset, u64 length, |
6d2940c8 | 1770 | enum obj_operation_type op_type, |
4e752f0a | 1771 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
1772 | { |
1773 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1774 | |
a0c5895b | 1775 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
1776 | if (!img_request) |
1777 | return NULL; | |
1778 | ||
bf0d5f50 | 1779 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1780 | img_request->op_type = op_type; |
bf0d5f50 AE |
1781 | img_request->offset = offset; |
1782 | img_request->length = length; | |
9bb0248d | 1783 | if (!rbd_img_is_write(img_request)) |
bf0d5f50 | 1784 | img_request->snap_id = rbd_dev->spec->snap_id; |
9bb0248d ID |
1785 | else |
1786 | img_request->snapc = snapc; | |
1787 | ||
a2acd00e | 1788 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 1789 | img_request_layered_set(img_request); |
a0c5895b | 1790 | |
bf0d5f50 | 1791 | spin_lock_init(&img_request->completion_lock); |
bf0d5f50 AE |
1792 | INIT_LIST_HEAD(&img_request->obj_requests); |
1793 | kref_init(&img_request->kref); | |
1794 | ||
37206ee5 | 1795 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
6d2940c8 | 1796 | obj_op_name(op_type), offset, length, img_request); |
37206ee5 | 1797 | |
bf0d5f50 AE |
1798 | return img_request; |
1799 | } | |
1800 | ||
1801 | static void rbd_img_request_destroy(struct kref *kref) | |
1802 | { | |
1803 | struct rbd_img_request *img_request; | |
1804 | struct rbd_obj_request *obj_request; | |
1805 | struct rbd_obj_request *next_obj_request; | |
1806 | ||
1807 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1808 | ||
37206ee5 AE |
1809 | dout("%s: img %p\n", __func__, img_request); |
1810 | ||
bf0d5f50 AE |
1811 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1812 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1813 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1814 | |
a2acd00e AE |
1815 | if (img_request_layered_test(img_request)) { |
1816 | img_request_layered_clear(img_request); | |
1817 | rbd_dev_parent_put(img_request->rbd_dev); | |
1818 | } | |
1819 | ||
9bb0248d | 1820 | if (rbd_img_is_write(img_request)) |
812164f8 | 1821 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1822 | |
1c2a9dfe | 1823 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1824 | } |
1825 | ||
e93f3152 AE |
1826 | static struct rbd_img_request *rbd_parent_request_create( |
1827 | struct rbd_obj_request *obj_request, | |
1828 | u64 img_offset, u64 length) | |
1829 | { | |
1830 | struct rbd_img_request *parent_request; | |
1831 | struct rbd_device *rbd_dev; | |
1832 | ||
1833 | rbd_assert(obj_request->img_request); | |
1834 | rbd_dev = obj_request->img_request->rbd_dev; | |
1835 | ||
4e752f0a | 1836 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
6d2940c8 | 1837 | length, OBJ_OP_READ, NULL); |
e93f3152 AE |
1838 | if (!parent_request) |
1839 | return NULL; | |
1840 | ||
1841 | img_request_child_set(parent_request); | |
1842 | rbd_obj_request_get(obj_request); | |
1843 | parent_request->obj_request = obj_request; | |
1844 | ||
1845 | return parent_request; | |
1846 | } | |
1847 | ||
1848 | static void rbd_parent_request_destroy(struct kref *kref) | |
1849 | { | |
1850 | struct rbd_img_request *parent_request; | |
1851 | struct rbd_obj_request *orig_request; | |
1852 | ||
1853 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
1854 | orig_request = parent_request->obj_request; | |
1855 | ||
1856 | parent_request->obj_request = NULL; | |
1857 | rbd_obj_request_put(orig_request); | |
1858 | img_request_child_clear(parent_request); | |
1859 | ||
1860 | rbd_img_request_destroy(kref); | |
1861 | } | |
1862 | ||
1217857f AE |
1863 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1864 | { | |
6365d33a | 1865 | struct rbd_img_request *img_request; |
1217857f AE |
1866 | unsigned int xferred; |
1867 | int result; | |
8b3e1a56 | 1868 | bool more; |
1217857f | 1869 | |
6365d33a AE |
1870 | rbd_assert(obj_request_img_data_test(obj_request)); |
1871 | img_request = obj_request->img_request; | |
1872 | ||
1217857f AE |
1873 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1874 | xferred = (unsigned int)obj_request->xferred; | |
1875 | result = obj_request->result; | |
1876 | if (result) { | |
1877 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1878 | ||
9584d508 | 1879 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
9bb0248d | 1880 | obj_op_name(img_request->op_type), obj_request->length, |
6d2940c8 | 1881 | obj_request->img_offset, obj_request->offset); |
9584d508 | 1882 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
1883 | result, xferred); |
1884 | if (!img_request->result) | |
1885 | img_request->result = result; | |
082a75da ID |
1886 | /* |
1887 | * Need to end I/O on the entire obj_request worth of | |
1888 | * bytes in case of error. | |
1889 | */ | |
1890 | xferred = obj_request->length; | |
1217857f AE |
1891 | } |
1892 | ||
8b3e1a56 AE |
1893 | if (img_request_child_test(img_request)) { |
1894 | rbd_assert(img_request->obj_request != NULL); | |
1895 | more = obj_request->which < img_request->obj_request_count - 1; | |
1896 | } else { | |
2a842aca CH |
1897 | blk_status_t status = errno_to_blk_status(result); |
1898 | ||
8b3e1a56 | 1899 | rbd_assert(img_request->rq != NULL); |
7ad18afa | 1900 | |
2a842aca | 1901 | more = blk_update_request(img_request->rq, status, xferred); |
7ad18afa | 1902 | if (!more) |
2a842aca | 1903 | __blk_mq_end_request(img_request->rq, status); |
8b3e1a56 AE |
1904 | } |
1905 | ||
1906 | return more; | |
1217857f AE |
1907 | } |
1908 | ||
2169238d AE |
1909 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1910 | { | |
1911 | struct rbd_img_request *img_request; | |
1912 | u32 which = obj_request->which; | |
1913 | bool more = true; | |
1914 | ||
6365d33a | 1915 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1916 | img_request = obj_request->img_request; |
1917 | ||
1918 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1919 | rbd_assert(img_request != NULL); | |
2169238d AE |
1920 | rbd_assert(img_request->obj_request_count > 0); |
1921 | rbd_assert(which != BAD_WHICH); | |
1922 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
1923 | |
1924 | spin_lock_irq(&img_request->completion_lock); | |
1925 | if (which != img_request->next_completion) | |
1926 | goto out; | |
1927 | ||
1928 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1929 | rbd_assert(more); |
1930 | rbd_assert(which < img_request->obj_request_count); | |
1931 | ||
1932 | if (!obj_request_done_test(obj_request)) | |
1933 | break; | |
1217857f | 1934 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1935 | which++; |
1936 | } | |
1937 | ||
1938 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1939 | img_request->next_completion = which; | |
1940 | out: | |
1941 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 1942 | rbd_img_request_put(img_request); |
2169238d AE |
1943 | |
1944 | if (!more) | |
1945 | rbd_img_request_complete(img_request); | |
1946 | } | |
1947 | ||
3da691bf ID |
1948 | static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) |
1949 | { | |
1950 | switch (obj_req->type) { | |
1951 | case OBJ_REQUEST_BIO: | |
1952 | osd_req_op_extent_osd_data_bio(obj_req->osd_req, which, | |
1953 | &obj_req->bio_pos, | |
1954 | obj_req->length); | |
1955 | break; | |
1956 | case OBJ_REQUEST_BVECS: | |
1957 | rbd_assert(obj_req->bvec_pos.iter.bi_size == | |
1958 | obj_req->length); | |
1959 | osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which, | |
1960 | &obj_req->bvec_pos); | |
1961 | break; | |
1962 | default: | |
1963 | rbd_assert(0); | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | static int rbd_obj_setup_read(struct rbd_obj_request *obj_req) | |
1968 | { | |
a162b308 | 1969 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); |
3da691bf ID |
1970 | if (!obj_req->osd_req) |
1971 | return -ENOMEM; | |
1972 | ||
1973 | osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ, | |
1974 | obj_req->offset, obj_req->length, 0, 0); | |
1975 | rbd_osd_req_setup_data(obj_req, 0); | |
1976 | ||
1977 | rbd_osd_req_format_read(obj_req); | |
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req, | |
1982 | unsigned int which) | |
1983 | { | |
1984 | struct page **pages; | |
1985 | ||
1986 | /* | |
1987 | * The response data for a STAT call consists of: | |
1988 | * le64 length; | |
1989 | * struct { | |
1990 | * le32 tv_sec; | |
1991 | * le32 tv_nsec; | |
1992 | * } mtime; | |
1993 | */ | |
1994 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
1995 | if (IS_ERR(pages)) | |
1996 | return PTR_ERR(pages); | |
1997 | ||
1998 | osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0); | |
1999 | osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages, | |
2000 | 8 + sizeof(struct ceph_timespec), | |
2001 | 0, false, true); | |
2002 | return 0; | |
2003 | } | |
2004 | ||
2005 | static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req, | |
2006 | unsigned int which) | |
2007 | { | |
2008 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2009 | u16 opcode; | |
2010 | ||
2011 | osd_req_op_alloc_hint_init(obj_req->osd_req, which++, | |
2012 | rbd_dev->layout.object_size, | |
2013 | rbd_dev->layout.object_size); | |
2014 | ||
2015 | if (rbd_obj_is_entire(obj_req)) | |
2016 | opcode = CEPH_OSD_OP_WRITEFULL; | |
2017 | else | |
2018 | opcode = CEPH_OSD_OP_WRITE; | |
2019 | ||
2020 | osd_req_op_extent_init(obj_req->osd_req, which, opcode, | |
2021 | obj_req->offset, obj_req->length, 0, 0); | |
2022 | rbd_osd_req_setup_data(obj_req, which++); | |
2023 | ||
2024 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
2025 | rbd_osd_req_format_write(obj_req); | |
2026 | } | |
2027 | ||
2028 | static int rbd_obj_setup_write(struct rbd_obj_request *obj_req) | |
2029 | { | |
3da691bf ID |
2030 | unsigned int num_osd_ops, which = 0; |
2031 | int ret; | |
2032 | ||
2033 | if (obj_request_overlaps_parent(obj_req)) { | |
2034 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2035 | num_osd_ops = 3; /* stat + setallochint + write/writefull */ | |
2036 | } else { | |
2037 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2038 | num_osd_ops = 2; /* setallochint + write/writefull */ | |
2039 | } | |
2040 | ||
a162b308 | 2041 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2042 | if (!obj_req->osd_req) |
2043 | return -ENOMEM; | |
2044 | ||
2045 | if (obj_request_overlaps_parent(obj_req)) { | |
2046 | ret = __rbd_obj_setup_stat(obj_req, which++); | |
2047 | if (ret) | |
2048 | return ret; | |
2049 | } | |
2050 | ||
2051 | __rbd_obj_setup_write(obj_req, which); | |
2052 | return 0; | |
2053 | } | |
2054 | ||
2055 | static void __rbd_obj_setup_discard(struct rbd_obj_request *obj_req, | |
2056 | unsigned int which) | |
2057 | { | |
2058 | u16 opcode; | |
2059 | ||
2060 | if (rbd_obj_is_entire(obj_req)) { | |
2061 | if (obj_request_overlaps_parent(obj_req)) { | |
2062 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2063 | } else { | |
2064 | osd_req_op_init(obj_req->osd_req, which++, | |
2065 | CEPH_OSD_OP_DELETE, 0); | |
2066 | opcode = 0; | |
2067 | } | |
2068 | } else if (rbd_obj_is_tail(obj_req)) { | |
2069 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2070 | } else { | |
2071 | opcode = CEPH_OSD_OP_ZERO; | |
2072 | } | |
2073 | ||
2074 | if (opcode) | |
2075 | osd_req_op_extent_init(obj_req->osd_req, which++, opcode, | |
2076 | obj_req->offset, obj_req->length, | |
2077 | 0, 0); | |
2078 | ||
2079 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
2080 | rbd_osd_req_format_write(obj_req); | |
2081 | } | |
2082 | ||
2083 | static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req) | |
2084 | { | |
3da691bf ID |
2085 | unsigned int num_osd_ops, which = 0; |
2086 | int ret; | |
2087 | ||
2088 | if (rbd_obj_is_entire(obj_req)) { | |
2089 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2090 | num_osd_ops = 1; /* truncate/delete */ | |
2091 | } else { | |
2092 | if (obj_request_overlaps_parent(obj_req)) { | |
2093 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2094 | num_osd_ops = 2; /* stat + truncate/zero */ | |
2095 | } else { | |
2096 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2097 | num_osd_ops = 1; /* truncate/zero */ | |
2098 | } | |
2099 | } | |
2100 | ||
a162b308 | 2101 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2102 | if (!obj_req->osd_req) |
2103 | return -ENOMEM; | |
2104 | ||
2105 | if (!rbd_obj_is_entire(obj_req) && | |
2106 | obj_request_overlaps_parent(obj_req)) { | |
2107 | ret = __rbd_obj_setup_stat(obj_req, which++); | |
2108 | if (ret) | |
2109 | return ret; | |
2110 | } | |
2111 | ||
2112 | __rbd_obj_setup_discard(obj_req, which); | |
2113 | return 0; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * For each object request in @img_req, allocate an OSD request, add | |
2118 | * individual OSD ops and prepare them for submission. The number of | |
2119 | * OSD ops depends on op_type and the overlap point (if any). | |
2120 | */ | |
2121 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
2122 | { | |
2123 | struct rbd_obj_request *obj_req; | |
2124 | int ret; | |
2125 | ||
2126 | for_each_obj_request(img_req, obj_req) { | |
9bb0248d | 2127 | switch (img_req->op_type) { |
3da691bf ID |
2128 | case OBJ_OP_READ: |
2129 | ret = rbd_obj_setup_read(obj_req); | |
2130 | break; | |
2131 | case OBJ_OP_WRITE: | |
2132 | ret = rbd_obj_setup_write(obj_req); | |
2133 | break; | |
2134 | case OBJ_OP_DISCARD: | |
2135 | ret = rbd_obj_setup_discard(obj_req); | |
2136 | break; | |
2137 | default: | |
2138 | rbd_assert(0); | |
2139 | } | |
2140 | if (ret) | |
2141 | return ret; | |
2142 | } | |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
f1a4739f AE |
2147 | /* |
2148 | * Split up an image request into one or more object requests, each | |
2149 | * to a different object. The "type" parameter indicates whether | |
2150 | * "data_desc" is the pointer to the head of a list of bio | |
2151 | * structures, or the base of a page array. In either case this | |
2152 | * function assumes data_desc describes memory sufficient to hold | |
2153 | * all data described by the image request. | |
2154 | */ | |
2155 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2156 | enum obj_request_type type, | |
2157 | void *data_desc) | |
bf0d5f50 AE |
2158 | { |
2159 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2160 | struct rbd_obj_request *obj_request = NULL; | |
2161 | struct rbd_obj_request *next_obj_request; | |
5359a17d | 2162 | struct ceph_bio_iter bio_it; |
7e07efb1 | 2163 | struct ceph_bvec_iter bvec_it; |
7da22d29 | 2164 | u64 img_offset; |
bf0d5f50 | 2165 | u64 resid; |
bf0d5f50 | 2166 | |
f1a4739f AE |
2167 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2168 | (int)type, data_desc); | |
37206ee5 | 2169 | |
7da22d29 | 2170 | img_offset = img_request->offset; |
bf0d5f50 | 2171 | resid = img_request->length; |
4dda41d3 | 2172 | rbd_assert(resid > 0); |
f1a4739f AE |
2173 | |
2174 | if (type == OBJ_REQUEST_BIO) { | |
5359a17d | 2175 | bio_it = *(struct ceph_bio_iter *)data_desc; |
4f024f37 | 2176 | rbd_assert(img_offset == |
5359a17d | 2177 | bio_it.iter.bi_sector << SECTOR_SHIFT); |
7e07efb1 ID |
2178 | } else if (type == OBJ_REQUEST_BVECS) { |
2179 | bvec_it = *(struct ceph_bvec_iter *)data_desc; | |
f1a4739f AE |
2180 | } |
2181 | ||
bf0d5f50 | 2182 | while (resid) { |
a90bb0c1 | 2183 | u64 object_no = img_offset >> rbd_dev->header.obj_order; |
67e2b652 ID |
2184 | u64 offset = rbd_segment_offset(rbd_dev, img_offset); |
2185 | u64 length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2186 | |
6c696d85 | 2187 | obj_request = rbd_obj_request_create(type); |
bf0d5f50 AE |
2188 | if (!obj_request) |
2189 | goto out_unwind; | |
62054da6 | 2190 | |
a90bb0c1 | 2191 | obj_request->object_no = object_no; |
67e2b652 ID |
2192 | obj_request->offset = offset; |
2193 | obj_request->length = length; | |
2194 | ||
03507db6 JD |
2195 | /* |
2196 | * set obj_request->img_request before creating the | |
2197 | * osd_request so that it gets the right snapc | |
2198 | */ | |
2199 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2200 | |
f1a4739f | 2201 | if (type == OBJ_REQUEST_BIO) { |
5359a17d ID |
2202 | obj_request->bio_pos = bio_it; |
2203 | ceph_bio_iter_advance(&bio_it, length); | |
7e07efb1 ID |
2204 | } else if (type == OBJ_REQUEST_BVECS) { |
2205 | obj_request->bvec_pos = bvec_it; | |
2206 | ceph_bvec_iter_shorten(&obj_request->bvec_pos, length); | |
2207 | ceph_bvec_iter_advance(&bvec_it, length); | |
f1a4739f | 2208 | } |
bf0d5f50 | 2209 | |
2169238d | 2210 | obj_request->callback = rbd_img_obj_callback; |
3b434a2a | 2211 | obj_request->img_offset = img_offset; |
9d4df01f | 2212 | |
7da22d29 | 2213 | img_offset += length; |
bf0d5f50 AE |
2214 | resid -= length; |
2215 | } | |
2216 | ||
3da691bf | 2217 | return __rbd_img_fill_request(img_request); |
bf0d5f50 | 2218 | |
bf0d5f50 AE |
2219 | out_unwind: |
2220 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2221 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2222 | |
2223 | return -ENOMEM; | |
2224 | } | |
2225 | ||
efbd1a11 | 2226 | static void rbd_img_request_submit(struct rbd_img_request *img_request) |
bf0d5f50 | 2227 | { |
bf0d5f50 AE |
2228 | struct rbd_obj_request *obj_request; |
2229 | ||
37206ee5 | 2230 | dout("%s: img %p\n", __func__, img_request); |
bf0d5f50 | 2231 | |
663ae2cc | 2232 | rbd_img_request_get(img_request); |
efbd1a11 | 2233 | for_each_obj_request(img_request, obj_request) |
3da691bf | 2234 | rbd_obj_request_submit(obj_request); |
bf0d5f50 | 2235 | |
663ae2cc | 2236 | rbd_img_request_put(img_request); |
bf0d5f50 | 2237 | } |
8b3e1a56 | 2238 | |
3da691bf ID |
2239 | static void rbd_img_end_child_request(struct rbd_img_request *img_req); |
2240 | ||
2241 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req, | |
2242 | u64 img_offset, u32 bytes) | |
2243 | { | |
2244 | struct rbd_img_request *img_req = obj_req->img_request; | |
2245 | struct rbd_img_request *child_img_req; | |
2246 | int ret; | |
2247 | ||
2248 | child_img_req = rbd_parent_request_create(obj_req, img_offset, bytes); | |
2249 | if (!child_img_req) | |
2250 | return -ENOMEM; | |
2251 | ||
2252 | child_img_req->callback = rbd_img_end_child_request; | |
2253 | ||
2254 | if (!rbd_img_is_write(img_req)) { | |
2255 | switch (obj_req->type) { | |
2256 | case OBJ_REQUEST_BIO: | |
2257 | ret = rbd_img_request_fill(child_img_req, | |
2258 | OBJ_REQUEST_BIO, | |
2259 | &obj_req->bio_pos); | |
2260 | break; | |
2261 | case OBJ_REQUEST_BVECS: | |
2262 | ret = rbd_img_request_fill(child_img_req, | |
2263 | OBJ_REQUEST_BVECS, | |
2264 | &obj_req->bvec_pos); | |
2265 | break; | |
2266 | default: | |
2267 | rbd_assert(0); | |
2268 | } | |
2269 | } else { | |
2270 | struct ceph_bvec_iter it = { | |
2271 | .bvecs = obj_req->copyup_bvecs, | |
2272 | .iter = { .bi_size = bytes }, | |
2273 | }; | |
2274 | ||
2275 | ret = rbd_img_request_fill(child_img_req, OBJ_REQUEST_BVECS, | |
2276 | &it); | |
2277 | } | |
2278 | if (ret) { | |
2279 | rbd_img_request_put(child_img_req); | |
2280 | return ret; | |
2281 | } | |
2282 | ||
2283 | rbd_img_request_submit(child_img_req); | |
2284 | return 0; | |
2285 | } | |
2286 | ||
2287 | static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req) | |
2288 | { | |
2289 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2290 | int ret; | |
2291 | ||
2292 | if (obj_req->result == -ENOENT && | |
2293 | obj_req->img_offset < rbd_dev->parent_overlap && | |
2294 | !obj_req->tried_parent) { | |
2295 | u64 obj_overlap = min(obj_req->length, | |
2296 | rbd_dev->parent_overlap - obj_req->img_offset); | |
2297 | ||
2298 | obj_req->tried_parent = true; | |
2299 | ret = rbd_obj_read_from_parent(obj_req, obj_req->img_offset, | |
2300 | obj_overlap); | |
2301 | if (ret) { | |
2302 | obj_req->result = ret; | |
2303 | return true; | |
2304 | } | |
2305 | return false; | |
2306 | } | |
2307 | ||
2308 | /* | |
2309 | * -ENOENT means a hole in the image -- zero-fill the entire | |
2310 | * length of the request. A short read also implies zero-fill | |
2311 | * to the end of the request. In both cases we update xferred | |
2312 | * count to indicate the whole request was satisfied. | |
2313 | */ | |
2314 | if (obj_req->result == -ENOENT || | |
2315 | (!obj_req->result && obj_req->xferred < obj_req->length)) { | |
2316 | rbd_assert(!obj_req->xferred || !obj_req->result); | |
2317 | rbd_obj_zero_range(obj_req, obj_req->xferred, | |
2318 | obj_req->length - obj_req->xferred); | |
2319 | obj_req->result = 0; | |
2320 | obj_req->xferred = obj_req->length; | |
2321 | } | |
2322 | ||
2323 | return true; | |
2324 | } | |
2325 | ||
2326 | /* | |
2327 | * copyup_bvecs pages are never highmem pages | |
2328 | */ | |
2329 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
2330 | { | |
2331 | struct ceph_bvec_iter it = { | |
2332 | .bvecs = bvecs, | |
2333 | .iter = { .bi_size = bytes }, | |
2334 | }; | |
2335 | ||
2336 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
2337 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
2338 | bv.bv_len)) | |
2339 | return false; | |
2340 | })); | |
2341 | return true; | |
2342 | } | |
2343 | ||
2344 | static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes) | |
2345 | { | |
3da691bf ID |
2346 | unsigned int num_osd_ops = obj_req->osd_req->r_num_ops; |
2347 | ||
2348 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); | |
2349 | rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT); | |
2350 | rbd_osd_req_destroy(obj_req->osd_req); | |
2351 | ||
2352 | /* | |
2353 | * Create a copyup request with the same number of OSD ops as | |
2354 | * the original request. The original request was stat + op(s), | |
2355 | * the new copyup request will be copyup + the same op(s). | |
2356 | */ | |
a162b308 | 2357 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2358 | if (!obj_req->osd_req) |
2359 | return -ENOMEM; | |
2360 | ||
2361 | /* | |
2362 | * Only send non-zero copyup data to save some I/O and network | |
2363 | * bandwidth -- zero copyup data is equivalent to the object not | |
2364 | * existing. | |
2365 | */ | |
2366 | if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) { | |
2367 | dout("%s obj_req %p detected zeroes\n", __func__, obj_req); | |
2368 | bytes = 0; | |
2369 | } | |
2370 | ||
2371 | osd_req_op_cls_init(obj_req->osd_req, 0, CEPH_OSD_OP_CALL, "rbd", | |
2372 | "copyup"); | |
2373 | osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0, | |
2374 | obj_req->copyup_bvecs, bytes); | |
2375 | ||
9bb0248d | 2376 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2377 | case OBJ_OP_WRITE: |
2378 | __rbd_obj_setup_write(obj_req, 1); | |
2379 | break; | |
2380 | case OBJ_OP_DISCARD: | |
2381 | rbd_assert(!rbd_obj_is_entire(obj_req)); | |
2382 | __rbd_obj_setup_discard(obj_req, 1); | |
2383 | break; | |
2384 | default: | |
2385 | rbd_assert(0); | |
2386 | } | |
2387 | ||
2388 | rbd_obj_request_submit(obj_req); | |
2389 | /* FIXME: in lieu of rbd_img_obj_callback() */ | |
2390 | rbd_img_request_put(obj_req->img_request); | |
2391 | return 0; | |
2392 | } | |
2393 | ||
7e07efb1 ID |
2394 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
2395 | { | |
2396 | u32 i; | |
2397 | ||
2398 | rbd_assert(!obj_req->copyup_bvecs); | |
2399 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
2400 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
2401 | sizeof(*obj_req->copyup_bvecs), | |
2402 | GFP_NOIO); | |
2403 | if (!obj_req->copyup_bvecs) | |
2404 | return -ENOMEM; | |
2405 | ||
2406 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { | |
2407 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
2408 | ||
2409 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
2410 | if (!obj_req->copyup_bvecs[i].bv_page) | |
2411 | return -ENOMEM; | |
2412 | ||
2413 | obj_req->copyup_bvecs[i].bv_offset = 0; | |
2414 | obj_req->copyup_bvecs[i].bv_len = len; | |
2415 | obj_overlap -= len; | |
2416 | } | |
2417 | ||
2418 | rbd_assert(!obj_overlap); | |
2419 | return 0; | |
2420 | } | |
2421 | ||
3da691bf ID |
2422 | static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) |
2423 | { | |
2424 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2425 | u64 img_offset; | |
2426 | u64 obj_overlap; | |
2427 | int ret; | |
2428 | ||
2429 | if (!obj_request_overlaps_parent(obj_req)) { | |
2430 | /* | |
2431 | * The overlap has become 0 (most likely because the | |
2432 | * image has been flattened). Use rbd_obj_issue_copyup() | |
2433 | * to re-submit the original write request -- the copyup | |
2434 | * operation itself will be a no-op, since someone must | |
2435 | * have populated the child object while we weren't | |
2436 | * looking. Move to WRITE_FLAT state as we'll be done | |
2437 | * with the operation once the null copyup completes. | |
2438 | */ | |
2439 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2440 | return rbd_obj_issue_copyup(obj_req, 0); | |
2441 | } | |
2442 | ||
2443 | /* | |
2444 | * Determine the byte range covered by the object in the | |
2445 | * child image to which the original request was to be sent. | |
2446 | */ | |
2447 | img_offset = obj_req->img_offset - obj_req->offset; | |
2448 | obj_overlap = rbd_dev->layout.object_size; | |
2449 | ||
2450 | /* | |
2451 | * There is no defined parent data beyond the parent | |
2452 | * overlap, so limit what we read at that boundary if | |
2453 | * necessary. | |
2454 | */ | |
2455 | if (img_offset + obj_overlap > rbd_dev->parent_overlap) { | |
2456 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2457 | obj_overlap = rbd_dev->parent_overlap - img_offset; | |
2458 | } | |
2459 | ||
2460 | ret = setup_copyup_bvecs(obj_req, obj_overlap); | |
2461 | if (ret) | |
2462 | return ret; | |
2463 | ||
2464 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; | |
2465 | return rbd_obj_read_from_parent(obj_req, img_offset, obj_overlap); | |
2466 | } | |
2467 | ||
2468 | static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req) | |
2469 | { | |
2470 | int ret; | |
2471 | ||
2472 | again: | |
2473 | switch (obj_req->write_state) { | |
2474 | case RBD_OBJ_WRITE_GUARD: | |
2475 | rbd_assert(!obj_req->xferred); | |
2476 | if (obj_req->result == -ENOENT) { | |
2477 | /* | |
2478 | * The target object doesn't exist. Read the data for | |
2479 | * the entire target object up to the overlap point (if | |
2480 | * any) from the parent, so we can use it for a copyup. | |
2481 | */ | |
2482 | ret = rbd_obj_handle_write_guard(obj_req); | |
2483 | if (ret) { | |
2484 | obj_req->result = ret; | |
2485 | return true; | |
2486 | } | |
2487 | return false; | |
2488 | } | |
2489 | /* fall through */ | |
2490 | case RBD_OBJ_WRITE_FLAT: | |
2491 | if (!obj_req->result) | |
2492 | /* | |
2493 | * There is no such thing as a successful short | |
2494 | * write -- indicate the whole request was satisfied. | |
2495 | */ | |
2496 | obj_req->xferred = obj_req->length; | |
2497 | return true; | |
2498 | case RBD_OBJ_WRITE_COPYUP: | |
2499 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2500 | if (obj_req->result) | |
2501 | goto again; | |
2502 | ||
2503 | rbd_assert(obj_req->xferred); | |
2504 | ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred); | |
2505 | if (ret) { | |
2506 | obj_req->result = ret; | |
2507 | return true; | |
2508 | } | |
2509 | return false; | |
2510 | default: | |
2511 | rbd_assert(0); | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * Returns true if @obj_req is completed, or false otherwise. | |
2517 | */ | |
2518 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2519 | { | |
9bb0248d | 2520 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2521 | case OBJ_OP_READ: |
2522 | return rbd_obj_handle_read(obj_req); | |
2523 | case OBJ_OP_WRITE: | |
2524 | return rbd_obj_handle_write(obj_req); | |
2525 | case OBJ_OP_DISCARD: | |
2526 | if (rbd_obj_handle_write(obj_req)) { | |
2527 | /* | |
2528 | * Hide -ENOENT from delete/truncate/zero -- discarding | |
2529 | * a non-existent object is not a problem. | |
2530 | */ | |
2531 | if (obj_req->result == -ENOENT) { | |
2532 | obj_req->result = 0; | |
2533 | obj_req->xferred = obj_req->length; | |
2534 | } | |
2535 | return true; | |
2536 | } | |
2537 | return false; | |
2538 | default: | |
2539 | rbd_assert(0); | |
2540 | } | |
2541 | } | |
2542 | ||
2543 | static void rbd_img_end_child_request(struct rbd_img_request *img_req) | |
2544 | { | |
2545 | struct rbd_obj_request *obj_req = img_req->obj_request; | |
2546 | ||
2547 | rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags)); | |
2548 | ||
2549 | obj_req->result = img_req->result; | |
2550 | obj_req->xferred = img_req->xferred; | |
2551 | rbd_img_request_put(img_req); | |
2552 | ||
2553 | rbd_obj_handle_request(obj_req); | |
2554 | } | |
2555 | ||
2556 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2557 | { | |
2558 | if (!__rbd_obj_handle_request(obj_req)) | |
2559 | return; | |
2560 | ||
2561 | obj_request_done_set(obj_req); | |
2562 | rbd_obj_request_complete(obj_req); | |
2563 | } | |
2564 | ||
ed95b21a | 2565 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 2566 | |
ed95b21a ID |
2567 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
2568 | const struct rbd_client_id *rhs) | |
2569 | { | |
2570 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
2571 | } | |
2572 | ||
2573 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
2574 | { | |
2575 | struct rbd_client_id cid; | |
2576 | ||
2577 | mutex_lock(&rbd_dev->watch_mutex); | |
2578 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
2579 | cid.handle = rbd_dev->watch_cookie; | |
2580 | mutex_unlock(&rbd_dev->watch_mutex); | |
2581 | return cid; | |
2582 | } | |
2583 | ||
2584 | /* | |
2585 | * lock_rwsem must be held for write | |
2586 | */ | |
2587 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
2588 | const struct rbd_client_id *cid) | |
2589 | { | |
2590 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
2591 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
2592 | cid->gid, cid->handle); | |
2593 | rbd_dev->owner_cid = *cid; /* struct */ | |
2594 | } | |
2595 | ||
2596 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
2597 | { | |
2598 | mutex_lock(&rbd_dev->watch_mutex); | |
2599 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
2600 | mutex_unlock(&rbd_dev->watch_mutex); | |
2601 | } | |
2602 | ||
edd8ca80 FM |
2603 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
2604 | { | |
2605 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
2606 | ||
2607 | strcpy(rbd_dev->lock_cookie, cookie); | |
2608 | rbd_set_owner_cid(rbd_dev, &cid); | |
2609 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
2610 | } | |
2611 | ||
ed95b21a ID |
2612 | /* |
2613 | * lock_rwsem must be held for write | |
2614 | */ | |
2615 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 2616 | { |
922dab61 | 2617 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 2618 | char cookie[32]; |
e627db08 | 2619 | int ret; |
b8d70035 | 2620 | |
cbbfb0ff ID |
2621 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
2622 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 2623 | |
ed95b21a ID |
2624 | format_lock_cookie(rbd_dev, cookie); |
2625 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
2626 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
2627 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 2628 | if (ret) |
ed95b21a | 2629 | return ret; |
b8d70035 | 2630 | |
ed95b21a | 2631 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 2632 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 2633 | return 0; |
b8d70035 AE |
2634 | } |
2635 | ||
ed95b21a ID |
2636 | /* |
2637 | * lock_rwsem must be held for write | |
2638 | */ | |
bbead745 | 2639 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 2640 | { |
922dab61 | 2641 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
2642 | int ret; |
2643 | ||
cbbfb0ff ID |
2644 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
2645 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 2646 | |
ed95b21a | 2647 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 2648 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
2649 | if (ret && ret != -ENOENT) |
2650 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 2651 | |
bbead745 ID |
2652 | /* treat errors as the image is unlocked */ |
2653 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 2654 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
2655 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
2656 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
2657 | } |
2658 | ||
ed95b21a ID |
2659 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2660 | enum rbd_notify_op notify_op, | |
2661 | struct page ***preply_pages, | |
2662 | size_t *preply_len) | |
9969ebc5 AE |
2663 | { |
2664 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a ID |
2665 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
2666 | int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN; | |
2667 | char buf[buf_size]; | |
2668 | void *p = buf; | |
9969ebc5 | 2669 | |
ed95b21a | 2670 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 2671 | |
ed95b21a ID |
2672 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
2673 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
2674 | ceph_encode_32(&p, notify_op); | |
2675 | ceph_encode_64(&p, cid.gid); | |
2676 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 2677 | |
ed95b21a ID |
2678 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
2679 | &rbd_dev->header_oloc, buf, buf_size, | |
2680 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
2681 | } |
2682 | ||
ed95b21a ID |
2683 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2684 | enum rbd_notify_op notify_op) | |
b30a01f2 | 2685 | { |
ed95b21a ID |
2686 | struct page **reply_pages; |
2687 | size_t reply_len; | |
b30a01f2 | 2688 | |
ed95b21a ID |
2689 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
2690 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2691 | } | |
b30a01f2 | 2692 | |
ed95b21a ID |
2693 | static void rbd_notify_acquired_lock(struct work_struct *work) |
2694 | { | |
2695 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
2696 | acquired_lock_work); | |
76756a51 | 2697 | |
ed95b21a | 2698 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
2699 | } |
2700 | ||
ed95b21a | 2701 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 2702 | { |
ed95b21a ID |
2703 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
2704 | released_lock_work); | |
811c6688 | 2705 | |
ed95b21a | 2706 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
2707 | } |
2708 | ||
ed95b21a | 2709 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 2710 | { |
ed95b21a ID |
2711 | struct page **reply_pages; |
2712 | size_t reply_len; | |
2713 | bool lock_owner_responded = false; | |
36be9a76 AE |
2714 | int ret; |
2715 | ||
ed95b21a | 2716 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 2717 | |
ed95b21a ID |
2718 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
2719 | &reply_pages, &reply_len); | |
2720 | if (ret && ret != -ETIMEDOUT) { | |
2721 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 2722 | goto out; |
ed95b21a | 2723 | } |
36be9a76 | 2724 | |
ed95b21a ID |
2725 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
2726 | void *p = page_address(reply_pages[0]); | |
2727 | void *const end = p + reply_len; | |
2728 | u32 n; | |
36be9a76 | 2729 | |
ed95b21a ID |
2730 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
2731 | while (n--) { | |
2732 | u8 struct_v; | |
2733 | u32 len; | |
36be9a76 | 2734 | |
ed95b21a ID |
2735 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
2736 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 2737 | |
ed95b21a ID |
2738 | ceph_decode_32_safe(&p, end, len, e_inval); |
2739 | if (!len) | |
2740 | continue; | |
2741 | ||
2742 | if (lock_owner_responded) { | |
2743 | rbd_warn(rbd_dev, | |
2744 | "duplicate lock owners detected"); | |
2745 | ret = -EIO; | |
2746 | goto out; | |
2747 | } | |
2748 | ||
2749 | lock_owner_responded = true; | |
2750 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
2751 | &struct_v, &len); | |
2752 | if (ret) { | |
2753 | rbd_warn(rbd_dev, | |
2754 | "failed to decode ResponseMessage: %d", | |
2755 | ret); | |
2756 | goto e_inval; | |
2757 | } | |
2758 | ||
2759 | ret = ceph_decode_32(&p); | |
2760 | } | |
2761 | } | |
2762 | ||
2763 | if (!lock_owner_responded) { | |
2764 | rbd_warn(rbd_dev, "no lock owners detected"); | |
2765 | ret = -ETIMEDOUT; | |
2766 | } | |
2767 | ||
2768 | out: | |
2769 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2770 | return ret; | |
2771 | ||
2772 | e_inval: | |
2773 | ret = -EINVAL; | |
2774 | goto out; | |
2775 | } | |
2776 | ||
2777 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
2778 | { | |
2779 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
2780 | ||
2781 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
2782 | if (wake_all) | |
2783 | wake_up_all(&rbd_dev->lock_waitq); | |
2784 | else | |
2785 | wake_up(&rbd_dev->lock_waitq); | |
2786 | } | |
2787 | ||
2788 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
2789 | struct ceph_locker **lockers, u32 *num_lockers) | |
2790 | { | |
2791 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2792 | u8 lock_type; | |
2793 | char *lock_tag; | |
2794 | int ret; | |
2795 | ||
2796 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2797 | ||
2798 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
2799 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2800 | &lock_type, &lock_tag, lockers, num_lockers); | |
2801 | if (ret) | |
2802 | return ret; | |
2803 | ||
2804 | if (*num_lockers == 0) { | |
2805 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
2806 | goto out; | |
2807 | } | |
2808 | ||
2809 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
2810 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
2811 | lock_tag); | |
2812 | ret = -EBUSY; | |
2813 | goto out; | |
2814 | } | |
2815 | ||
2816 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
2817 | rbd_warn(rbd_dev, "shared lock type detected"); | |
2818 | ret = -EBUSY; | |
2819 | goto out; | |
2820 | } | |
2821 | ||
2822 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
2823 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
2824 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
2825 | (*lockers)[0].id.cookie); | |
2826 | ret = -EBUSY; | |
2827 | goto out; | |
2828 | } | |
2829 | ||
2830 | out: | |
2831 | kfree(lock_tag); | |
2832 | return ret; | |
2833 | } | |
2834 | ||
2835 | static int find_watcher(struct rbd_device *rbd_dev, | |
2836 | const struct ceph_locker *locker) | |
2837 | { | |
2838 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2839 | struct ceph_watch_item *watchers; | |
2840 | u32 num_watchers; | |
2841 | u64 cookie; | |
2842 | int i; | |
2843 | int ret; | |
2844 | ||
2845 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
2846 | &rbd_dev->header_oloc, &watchers, | |
2847 | &num_watchers); | |
2848 | if (ret) | |
2849 | return ret; | |
2850 | ||
2851 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
2852 | for (i = 0; i < num_watchers; i++) { | |
2853 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
2854 | sizeof(locker->info.addr)) && | |
2855 | watchers[i].cookie == cookie) { | |
2856 | struct rbd_client_id cid = { | |
2857 | .gid = le64_to_cpu(watchers[i].name.num), | |
2858 | .handle = cookie, | |
2859 | }; | |
2860 | ||
2861 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
2862 | rbd_dev, cid.gid, cid.handle); | |
2863 | rbd_set_owner_cid(rbd_dev, &cid); | |
2864 | ret = 1; | |
2865 | goto out; | |
2866 | } | |
2867 | } | |
2868 | ||
2869 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
2870 | ret = 0; | |
2871 | out: | |
2872 | kfree(watchers); | |
2873 | return ret; | |
2874 | } | |
2875 | ||
2876 | /* | |
2877 | * lock_rwsem must be held for write | |
2878 | */ | |
2879 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
2880 | { | |
2881 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2882 | struct ceph_locker *lockers; | |
2883 | u32 num_lockers; | |
2884 | int ret; | |
2885 | ||
2886 | for (;;) { | |
2887 | ret = rbd_lock(rbd_dev); | |
2888 | if (ret != -EBUSY) | |
2889 | return ret; | |
2890 | ||
2891 | /* determine if the current lock holder is still alive */ | |
2892 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
2893 | if (ret) | |
2894 | return ret; | |
2895 | ||
2896 | if (num_lockers == 0) | |
2897 | goto again; | |
2898 | ||
2899 | ret = find_watcher(rbd_dev, lockers); | |
2900 | if (ret) { | |
2901 | if (ret > 0) | |
2902 | ret = 0; /* have to request lock */ | |
2903 | goto out; | |
2904 | } | |
2905 | ||
2906 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
2907 | ENTITY_NAME(lockers[0].id.name)); | |
2908 | ||
2909 | ret = ceph_monc_blacklist_add(&client->monc, | |
2910 | &lockers[0].info.addr); | |
2911 | if (ret) { | |
2912 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
2913 | ENTITY_NAME(lockers[0].id.name), ret); | |
2914 | goto out; | |
2915 | } | |
2916 | ||
2917 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
2918 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2919 | lockers[0].id.cookie, | |
2920 | &lockers[0].id.name); | |
2921 | if (ret && ret != -ENOENT) | |
2922 | goto out; | |
2923 | ||
2924 | again: | |
2925 | ceph_free_lockers(lockers, num_lockers); | |
2926 | } | |
2927 | ||
2928 | out: | |
2929 | ceph_free_lockers(lockers, num_lockers); | |
2930 | return ret; | |
2931 | } | |
2932 | ||
2933 | /* | |
2934 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
2935 | */ | |
2936 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
2937 | int *pret) | |
2938 | { | |
2939 | enum rbd_lock_state lock_state; | |
2940 | ||
2941 | down_read(&rbd_dev->lock_rwsem); | |
2942 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
2943 | rbd_dev->lock_state); | |
2944 | if (__rbd_is_lock_owner(rbd_dev)) { | |
2945 | lock_state = rbd_dev->lock_state; | |
2946 | up_read(&rbd_dev->lock_rwsem); | |
2947 | return lock_state; | |
2948 | } | |
2949 | ||
2950 | up_read(&rbd_dev->lock_rwsem); | |
2951 | down_write(&rbd_dev->lock_rwsem); | |
2952 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
2953 | rbd_dev->lock_state); | |
2954 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
2955 | *pret = rbd_try_lock(rbd_dev); | |
2956 | if (*pret) | |
2957 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
2958 | } | |
2959 | ||
2960 | lock_state = rbd_dev->lock_state; | |
2961 | up_write(&rbd_dev->lock_rwsem); | |
2962 | return lock_state; | |
2963 | } | |
2964 | ||
2965 | static void rbd_acquire_lock(struct work_struct *work) | |
2966 | { | |
2967 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
2968 | struct rbd_device, lock_dwork); | |
2969 | enum rbd_lock_state lock_state; | |
37f13252 | 2970 | int ret = 0; |
ed95b21a ID |
2971 | |
2972 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2973 | again: | |
2974 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
2975 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
2976 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
2977 | wake_requests(rbd_dev, true); | |
2978 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
2979 | rbd_dev, lock_state, ret); | |
2980 | return; | |
2981 | } | |
2982 | ||
2983 | ret = rbd_request_lock(rbd_dev); | |
2984 | if (ret == -ETIMEDOUT) { | |
2985 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
2986 | } else if (ret == -EROFS) { |
2987 | rbd_warn(rbd_dev, "peer will not release lock"); | |
2988 | /* | |
2989 | * If this is rbd_add_acquire_lock(), we want to fail | |
2990 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
2991 | * want to block. | |
2992 | */ | |
2993 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
2994 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
2995 | /* wake "rbd map --exclusive" process */ | |
2996 | wake_requests(rbd_dev, false); | |
2997 | } | |
ed95b21a ID |
2998 | } else if (ret < 0) { |
2999 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3000 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3001 | RBD_RETRY_DELAY); | |
3002 | } else { | |
3003 | /* | |
3004 | * lock owner acked, but resend if we don't see them | |
3005 | * release the lock | |
3006 | */ | |
3007 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3008 | rbd_dev); | |
3009 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3010 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3011 | } | |
3012 | } | |
3013 | ||
3014 | /* | |
3015 | * lock_rwsem must be held for write | |
3016 | */ | |
3017 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3018 | { | |
3019 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3020 | rbd_dev->lock_state); | |
3021 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3022 | return false; | |
3023 | ||
3024 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3025 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3026 | /* |
ed95b21a | 3027 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3028 | * |
ed95b21a ID |
3029 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3030 | * may be shared with other devices. | |
52bb1f9b | 3031 | */ |
ed95b21a ID |
3032 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3033 | up_read(&rbd_dev->lock_rwsem); | |
3034 | ||
3035 | down_write(&rbd_dev->lock_rwsem); | |
3036 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3037 | rbd_dev->lock_state); | |
3038 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3039 | return false; | |
3040 | ||
bbead745 ID |
3041 | rbd_unlock(rbd_dev); |
3042 | /* | |
3043 | * Give others a chance to grab the lock - we would re-acquire | |
3044 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3045 | * otherwise. We need to ack our own notifications, so this | |
3046 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3047 | * after wake_requests() in rbd_handle_released_lock(). | |
3048 | */ | |
3049 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3050 | return true; |
3051 | } | |
3052 | ||
3053 | static void rbd_release_lock_work(struct work_struct *work) | |
3054 | { | |
3055 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3056 | unlock_work); | |
3057 | ||
3058 | down_write(&rbd_dev->lock_rwsem); | |
3059 | rbd_release_lock(rbd_dev); | |
3060 | up_write(&rbd_dev->lock_rwsem); | |
3061 | } | |
3062 | ||
3063 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3064 | void **p) | |
3065 | { | |
3066 | struct rbd_client_id cid = { 0 }; | |
3067 | ||
3068 | if (struct_v >= 2) { | |
3069 | cid.gid = ceph_decode_64(p); | |
3070 | cid.handle = ceph_decode_64(p); | |
3071 | } | |
3072 | ||
3073 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3074 | cid.handle); | |
3075 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3076 | down_write(&rbd_dev->lock_rwsem); | |
3077 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3078 | /* | |
3079 | * we already know that the remote client is | |
3080 | * the owner | |
3081 | */ | |
3082 | up_write(&rbd_dev->lock_rwsem); | |
3083 | return; | |
3084 | } | |
3085 | ||
3086 | rbd_set_owner_cid(rbd_dev, &cid); | |
3087 | downgrade_write(&rbd_dev->lock_rwsem); | |
3088 | } else { | |
3089 | down_read(&rbd_dev->lock_rwsem); | |
3090 | } | |
3091 | ||
3092 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3093 | wake_requests(rbd_dev, false); | |
3094 | up_read(&rbd_dev->lock_rwsem); | |
3095 | } | |
3096 | ||
3097 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3098 | void **p) | |
3099 | { | |
3100 | struct rbd_client_id cid = { 0 }; | |
3101 | ||
3102 | if (struct_v >= 2) { | |
3103 | cid.gid = ceph_decode_64(p); | |
3104 | cid.handle = ceph_decode_64(p); | |
3105 | } | |
3106 | ||
3107 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3108 | cid.handle); | |
3109 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3110 | down_write(&rbd_dev->lock_rwsem); | |
3111 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3112 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3113 | __func__, rbd_dev, cid.gid, cid.handle, | |
3114 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3115 | up_write(&rbd_dev->lock_rwsem); | |
3116 | return; | |
3117 | } | |
3118 | ||
3119 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3120 | downgrade_write(&rbd_dev->lock_rwsem); | |
3121 | } else { | |
3122 | down_read(&rbd_dev->lock_rwsem); | |
3123 | } | |
3124 | ||
3125 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3126 | wake_requests(rbd_dev, false); | |
3127 | up_read(&rbd_dev->lock_rwsem); | |
3128 | } | |
3129 | ||
3b77faa0 ID |
3130 | /* |
3131 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3132 | * ResponseMessage is needed. | |
3133 | */ | |
3134 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3135 | void **p) | |
ed95b21a ID |
3136 | { |
3137 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3138 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3139 | int result = 1; |
ed95b21a ID |
3140 | |
3141 | if (struct_v >= 2) { | |
3142 | cid.gid = ceph_decode_64(p); | |
3143 | cid.handle = ceph_decode_64(p); | |
3144 | } | |
3145 | ||
3146 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3147 | cid.handle); | |
3148 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3149 | return result; |
ed95b21a ID |
3150 | |
3151 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3152 | if (__rbd_is_lock_owner(rbd_dev)) { |
3153 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3154 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3155 | goto out_unlock; | |
3156 | ||
3157 | /* | |
3158 | * encode ResponseMessage(0) so the peer can detect | |
3159 | * a missing owner | |
3160 | */ | |
3161 | result = 0; | |
3162 | ||
3163 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3164 | if (!rbd_dev->opts->exclusive) { |
3165 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3166 | __func__, rbd_dev); | |
3167 | queue_work(rbd_dev->task_wq, | |
3168 | &rbd_dev->unlock_work); | |
3169 | } else { | |
3170 | /* refuse to release the lock */ | |
3171 | result = -EROFS; | |
3172 | } | |
ed95b21a ID |
3173 | } |
3174 | } | |
3b77faa0 ID |
3175 | |
3176 | out_unlock: | |
ed95b21a | 3177 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3178 | return result; |
ed95b21a ID |
3179 | } |
3180 | ||
3181 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3182 | u64 notify_id, u64 cookie, s32 *result) | |
3183 | { | |
3184 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3185 | int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; | |
3186 | char buf[buf_size]; | |
3187 | int ret; | |
3188 | ||
3189 | if (result) { | |
3190 | void *p = buf; | |
3191 | ||
3192 | /* encode ResponseMessage */ | |
3193 | ceph_start_encoding(&p, 1, 1, | |
3194 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3195 | ceph_encode_32(&p, *result); | |
3196 | } else { | |
3197 | buf_size = 0; | |
3198 | } | |
b8d70035 | 3199 | |
922dab61 ID |
3200 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3201 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3202 | buf, buf_size); |
52bb1f9b | 3203 | if (ret) |
ed95b21a ID |
3204 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3205 | } | |
3206 | ||
3207 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3208 | u64 cookie) | |
3209 | { | |
3210 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3211 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3212 | } | |
3213 | ||
3214 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3215 | u64 notify_id, u64 cookie, s32 result) | |
3216 | { | |
3217 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3218 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3219 | } | |
3220 | ||
3221 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3222 | u64 notifier_id, void *data, size_t data_len) | |
3223 | { | |
3224 | struct rbd_device *rbd_dev = arg; | |
3225 | void *p = data; | |
3226 | void *const end = p + data_len; | |
d4c2269b | 3227 | u8 struct_v = 0; |
ed95b21a ID |
3228 | u32 len; |
3229 | u32 notify_op; | |
3230 | int ret; | |
3231 | ||
3232 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3233 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3234 | if (data_len) { | |
3235 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3236 | &struct_v, &len); | |
3237 | if (ret) { | |
3238 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3239 | ret); | |
3240 | return; | |
3241 | } | |
3242 | ||
3243 | notify_op = ceph_decode_32(&p); | |
3244 | } else { | |
3245 | /* legacy notification for header updates */ | |
3246 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3247 | len = 0; | |
3248 | } | |
3249 | ||
3250 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3251 | switch (notify_op) { | |
3252 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3253 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3254 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3255 | break; | |
3256 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3257 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3258 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3259 | break; | |
3260 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3261 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3262 | if (ret <= 0) | |
ed95b21a | 3263 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3264 | cookie, ret); |
ed95b21a ID |
3265 | else |
3266 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3267 | break; | |
3268 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3269 | ret = rbd_dev_refresh(rbd_dev); | |
3270 | if (ret) | |
3271 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3272 | ||
3273 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3274 | break; | |
3275 | default: | |
3276 | if (rbd_is_lock_owner(rbd_dev)) | |
3277 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3278 | cookie, -EOPNOTSUPP); | |
3279 | else | |
3280 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3281 | break; | |
3282 | } | |
b8d70035 AE |
3283 | } |
3284 | ||
99d16943 ID |
3285 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3286 | ||
922dab61 | 3287 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3288 | { |
922dab61 | 3289 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3290 | |
922dab61 | 3291 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3292 | |
ed95b21a ID |
3293 | down_write(&rbd_dev->lock_rwsem); |
3294 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3295 | up_write(&rbd_dev->lock_rwsem); | |
3296 | ||
99d16943 ID |
3297 | mutex_lock(&rbd_dev->watch_mutex); |
3298 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3299 | __rbd_unregister_watch(rbd_dev); | |
3300 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3301 | |
99d16943 | 3302 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3303 | } |
99d16943 | 3304 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3305 | } |
3306 | ||
9969ebc5 | 3307 | /* |
99d16943 | 3308 | * watch_mutex must be locked |
9969ebc5 | 3309 | */ |
99d16943 | 3310 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3311 | { |
3312 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3313 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3314 | |
922dab61 | 3315 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3316 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3317 | |
922dab61 ID |
3318 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3319 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3320 | rbd_watch_errcb, rbd_dev); | |
3321 | if (IS_ERR(handle)) | |
3322 | return PTR_ERR(handle); | |
8eb87565 | 3323 | |
922dab61 | 3324 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3325 | return 0; |
b30a01f2 ID |
3326 | } |
3327 | ||
99d16943 ID |
3328 | /* |
3329 | * watch_mutex must be locked | |
3330 | */ | |
3331 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3332 | { |
922dab61 ID |
3333 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3334 | int ret; | |
b30a01f2 | 3335 | |
99d16943 ID |
3336 | rbd_assert(rbd_dev->watch_handle); |
3337 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3338 | |
922dab61 ID |
3339 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3340 | if (ret) | |
3341 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3342 | |
922dab61 | 3343 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3344 | } |
3345 | ||
99d16943 ID |
3346 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3347 | { | |
3348 | int ret; | |
3349 | ||
3350 | mutex_lock(&rbd_dev->watch_mutex); | |
3351 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3352 | ret = __rbd_register_watch(rbd_dev); | |
3353 | if (ret) | |
3354 | goto out; | |
3355 | ||
3356 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3357 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3358 | ||
3359 | out: | |
3360 | mutex_unlock(&rbd_dev->watch_mutex); | |
3361 | return ret; | |
3362 | } | |
3363 | ||
3364 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3365 | { |
99d16943 ID |
3366 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3367 | ||
3368 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
ed95b21a ID |
3369 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3370 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3371 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3372 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3373 | } |
3374 | ||
3375 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3376 | { | |
ed95b21a | 3377 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3378 | cancel_tasks_sync(rbd_dev); |
3379 | ||
3380 | mutex_lock(&rbd_dev->watch_mutex); | |
3381 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3382 | __rbd_unregister_watch(rbd_dev); | |
3383 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3384 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3385 | |
811c6688 | 3386 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3387 | } |
3388 | ||
14bb211d ID |
3389 | /* |
3390 | * lock_rwsem must be held for write | |
3391 | */ | |
3392 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3393 | { | |
3394 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3395 | char cookie[32]; | |
3396 | int ret; | |
3397 | ||
3398 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3399 | ||
3400 | format_lock_cookie(rbd_dev, cookie); | |
3401 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3402 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3403 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3404 | RBD_LOCK_TAG, cookie); | |
3405 | if (ret) { | |
3406 | if (ret != -EOPNOTSUPP) | |
3407 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3408 | ret); | |
3409 | ||
3410 | /* | |
3411 | * Lock cookie cannot be updated on older OSDs, so do | |
3412 | * a manual release and queue an acquire. | |
3413 | */ | |
3414 | if (rbd_release_lock(rbd_dev)) | |
3415 | queue_delayed_work(rbd_dev->task_wq, | |
3416 | &rbd_dev->lock_dwork, 0); | |
3417 | } else { | |
edd8ca80 | 3418 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3419 | } |
3420 | } | |
3421 | ||
99d16943 ID |
3422 | static void rbd_reregister_watch(struct work_struct *work) |
3423 | { | |
3424 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3425 | struct rbd_device, watch_dwork); | |
3426 | int ret; | |
3427 | ||
3428 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3429 | ||
3430 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3431 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3432 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3433 | return; |
87c0fded | 3434 | } |
99d16943 ID |
3435 | |
3436 | ret = __rbd_register_watch(rbd_dev); | |
3437 | if (ret) { | |
3438 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3439 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3440 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3441 | wake_requests(rbd_dev, true); |
87c0fded | 3442 | } else { |
99d16943 ID |
3443 | queue_delayed_work(rbd_dev->task_wq, |
3444 | &rbd_dev->watch_dwork, | |
3445 | RBD_RETRY_DELAY); | |
87c0fded ID |
3446 | } |
3447 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3448 | return; |
99d16943 ID |
3449 | } |
3450 | ||
3451 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3452 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3453 | mutex_unlock(&rbd_dev->watch_mutex); | |
3454 | ||
14bb211d ID |
3455 | down_write(&rbd_dev->lock_rwsem); |
3456 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3457 | rbd_reacquire_lock(rbd_dev); | |
3458 | up_write(&rbd_dev->lock_rwsem); | |
3459 | ||
99d16943 ID |
3460 | ret = rbd_dev_refresh(rbd_dev); |
3461 | if (ret) | |
3462 | rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); | |
99d16943 ID |
3463 | } |
3464 | ||
36be9a76 | 3465 | /* |
f40eb349 AE |
3466 | * Synchronous osd object method call. Returns the number of bytes |
3467 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3468 | */ |
3469 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3470 | struct ceph_object_id *oid, |
3471 | struct ceph_object_locator *oloc, | |
36be9a76 | 3472 | const char *method_name, |
4157976b | 3473 | const void *outbound, |
36be9a76 | 3474 | size_t outbound_size, |
4157976b | 3475 | void *inbound, |
e2a58ee5 | 3476 | size_t inbound_size) |
36be9a76 | 3477 | { |
ecd4a68a ID |
3478 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3479 | struct page *req_page = NULL; | |
3480 | struct page *reply_page; | |
36be9a76 AE |
3481 | int ret; |
3482 | ||
3483 | /* | |
6010a451 AE |
3484 | * Method calls are ultimately read operations. The result |
3485 | * should placed into the inbound buffer provided. They | |
3486 | * also supply outbound data--parameters for the object | |
3487 | * method. Currently if this is present it will be a | |
3488 | * snapshot id. | |
36be9a76 | 3489 | */ |
ecd4a68a ID |
3490 | if (outbound) { |
3491 | if (outbound_size > PAGE_SIZE) | |
3492 | return -E2BIG; | |
36be9a76 | 3493 | |
ecd4a68a ID |
3494 | req_page = alloc_page(GFP_KERNEL); |
3495 | if (!req_page) | |
3496 | return -ENOMEM; | |
04017e29 | 3497 | |
ecd4a68a | 3498 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3499 | } |
36be9a76 | 3500 | |
ecd4a68a ID |
3501 | reply_page = alloc_page(GFP_KERNEL); |
3502 | if (!reply_page) { | |
3503 | if (req_page) | |
3504 | __free_page(req_page); | |
3505 | return -ENOMEM; | |
3506 | } | |
57385b51 | 3507 | |
ecd4a68a ID |
3508 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3509 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3510 | reply_page, &inbound_size); | |
3511 | if (!ret) { | |
3512 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3513 | ret = inbound_size; | |
3514 | } | |
36be9a76 | 3515 | |
ecd4a68a ID |
3516 | if (req_page) |
3517 | __free_page(req_page); | |
3518 | __free_page(reply_page); | |
36be9a76 AE |
3519 | return ret; |
3520 | } | |
3521 | ||
ed95b21a ID |
3522 | /* |
3523 | * lock_rwsem must be held for read | |
3524 | */ | |
3525 | static void rbd_wait_state_locked(struct rbd_device *rbd_dev) | |
3526 | { | |
3527 | DEFINE_WAIT(wait); | |
3528 | ||
3529 | do { | |
3530 | /* | |
3531 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3532 | * and cancel_delayed_work() in wake_requests(). | |
3533 | */ | |
3534 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3535 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3536 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3537 | TASK_UNINTERRUPTIBLE); | |
3538 | up_read(&rbd_dev->lock_rwsem); | |
3539 | schedule(); | |
3540 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded ID |
3541 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
3542 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)); | |
3543 | ||
ed95b21a ID |
3544 | finish_wait(&rbd_dev->lock_waitq, &wait); |
3545 | } | |
3546 | ||
7ad18afa | 3547 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3548 | { |
7ad18afa CH |
3549 | struct request *rq = blk_mq_rq_from_pdu(work); |
3550 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3551 | struct rbd_img_request *img_request; |
4e752f0a | 3552 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3553 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3554 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3555 | enum obj_operation_type op_type; |
4e752f0a | 3556 | u64 mapping_size; |
80de1912 | 3557 | bool must_be_locked; |
bf0d5f50 AE |
3558 | int result; |
3559 | ||
aebf526b CH |
3560 | switch (req_op(rq)) { |
3561 | case REQ_OP_DISCARD: | |
6ac56951 | 3562 | case REQ_OP_WRITE_ZEROES: |
90e98c52 | 3563 | op_type = OBJ_OP_DISCARD; |
aebf526b CH |
3564 | break; |
3565 | case REQ_OP_WRITE: | |
6d2940c8 | 3566 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
3567 | break; |
3568 | case REQ_OP_READ: | |
6d2940c8 | 3569 | op_type = OBJ_OP_READ; |
aebf526b CH |
3570 | break; |
3571 | default: | |
3572 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
3573 | result = -EIO; | |
3574 | goto err; | |
3575 | } | |
6d2940c8 | 3576 | |
bc1ecc65 | 3577 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3578 | |
bc1ecc65 ID |
3579 | if (!length) { |
3580 | dout("%s: zero-length request\n", __func__); | |
3581 | result = 0; | |
3582 | goto err_rq; | |
3583 | } | |
bf0d5f50 | 3584 | |
9568c93e ID |
3585 | rbd_assert(op_type == OBJ_OP_READ || |
3586 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 3587 | |
bc1ecc65 ID |
3588 | /* |
3589 | * Quit early if the mapped snapshot no longer exists. It's | |
3590 | * still possible the snapshot will have disappeared by the | |
3591 | * time our request arrives at the osd, but there's no sense in | |
3592 | * sending it if we already know. | |
3593 | */ | |
3594 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3595 | dout("request for non-existent snapshot"); | |
3596 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3597 | result = -ENXIO; | |
3598 | goto err_rq; | |
3599 | } | |
4dda41d3 | 3600 | |
bc1ecc65 ID |
3601 | if (offset && length > U64_MAX - offset + 1) { |
3602 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3603 | length); | |
3604 | result = -EINVAL; | |
3605 | goto err_rq; /* Shouldn't happen */ | |
3606 | } | |
4dda41d3 | 3607 | |
7ad18afa CH |
3608 | blk_mq_start_request(rq); |
3609 | ||
4e752f0a JD |
3610 | down_read(&rbd_dev->header_rwsem); |
3611 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3612 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3613 | snapc = rbd_dev->header.snapc; |
3614 | ceph_get_snap_context(snapc); | |
3615 | } | |
3616 | up_read(&rbd_dev->header_rwsem); | |
3617 | ||
3618 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3619 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3620 | length, mapping_size); |
bc1ecc65 ID |
3621 | result = -EIO; |
3622 | goto err_rq; | |
3623 | } | |
bf0d5f50 | 3624 | |
f9bebd58 ID |
3625 | must_be_locked = |
3626 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
3627 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
3628 | if (must_be_locked) { |
3629 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded | 3630 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
e010dd0a ID |
3631 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3632 | if (rbd_dev->opts->exclusive) { | |
3633 | rbd_warn(rbd_dev, "exclusive lock required"); | |
3634 | result = -EROFS; | |
3635 | goto err_unlock; | |
3636 | } | |
ed95b21a | 3637 | rbd_wait_state_locked(rbd_dev); |
e010dd0a | 3638 | } |
87c0fded ID |
3639 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3640 | result = -EBLACKLISTED; | |
3641 | goto err_unlock; | |
3642 | } | |
ed95b21a ID |
3643 | } |
3644 | ||
6d2940c8 | 3645 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
4e752f0a | 3646 | snapc); |
bc1ecc65 ID |
3647 | if (!img_request) { |
3648 | result = -ENOMEM; | |
ed95b21a | 3649 | goto err_unlock; |
bc1ecc65 ID |
3650 | } |
3651 | img_request->rq = rq; | |
70b16db8 | 3652 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3653 | |
90e98c52 GZ |
3654 | if (op_type == OBJ_OP_DISCARD) |
3655 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, | |
3656 | NULL); | |
5359a17d ID |
3657 | else { |
3658 | struct ceph_bio_iter bio_it = { .bio = rq->bio, | |
3659 | .iter = rq->bio->bi_iter }; | |
3660 | ||
90e98c52 | 3661 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
5359a17d ID |
3662 | &bio_it); |
3663 | } | |
bc1ecc65 ID |
3664 | if (result) |
3665 | goto err_img_request; | |
bf0d5f50 | 3666 | |
efbd1a11 | 3667 | rbd_img_request_submit(img_request); |
ed95b21a ID |
3668 | if (must_be_locked) |
3669 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 3670 | return; |
bf0d5f50 | 3671 | |
bc1ecc65 ID |
3672 | err_img_request: |
3673 | rbd_img_request_put(img_request); | |
ed95b21a ID |
3674 | err_unlock: |
3675 | if (must_be_locked) | |
3676 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
3677 | err_rq: |
3678 | if (result) | |
3679 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3680 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3681 | ceph_put_snap_context(snapc); |
7ad18afa | 3682 | err: |
2a842aca | 3683 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 3684 | } |
bf0d5f50 | 3685 | |
fc17b653 | 3686 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 3687 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 3688 | { |
7ad18afa CH |
3689 | struct request *rq = bd->rq; |
3690 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3691 | |
7ad18afa | 3692 | queue_work(rbd_wq, work); |
fc17b653 | 3693 | return BLK_STS_OK; |
bf0d5f50 AE |
3694 | } |
3695 | ||
602adf40 YS |
3696 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3697 | { | |
5769ed0c ID |
3698 | blk_cleanup_queue(rbd_dev->disk->queue); |
3699 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
3700 | put_disk(rbd_dev->disk); | |
a0cab924 | 3701 | rbd_dev->disk = NULL; |
602adf40 YS |
3702 | } |
3703 | ||
788e2df3 | 3704 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
3705 | struct ceph_object_id *oid, |
3706 | struct ceph_object_locator *oloc, | |
3707 | void *buf, int buf_len) | |
788e2df3 AE |
3708 | |
3709 | { | |
fe5478e0 ID |
3710 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3711 | struct ceph_osd_request *req; | |
3712 | struct page **pages; | |
3713 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
3714 | int ret; |
3715 | ||
fe5478e0 ID |
3716 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
3717 | if (!req) | |
3718 | return -ENOMEM; | |
788e2df3 | 3719 | |
fe5478e0 ID |
3720 | ceph_oid_copy(&req->r_base_oid, oid); |
3721 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
3722 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 3723 | |
fe5478e0 | 3724 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
788e2df3 | 3725 | if (ret) |
fe5478e0 | 3726 | goto out_req; |
788e2df3 | 3727 | |
fe5478e0 ID |
3728 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
3729 | if (IS_ERR(pages)) { | |
3730 | ret = PTR_ERR(pages); | |
3731 | goto out_req; | |
3732 | } | |
1ceae7ef | 3733 | |
fe5478e0 ID |
3734 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
3735 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
3736 | true); | |
3737 | ||
3738 | ceph_osdc_start_request(osdc, req, false); | |
3739 | ret = ceph_osdc_wait_request(osdc, req); | |
3740 | if (ret >= 0) | |
3741 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 3742 | |
fe5478e0 ID |
3743 | out_req: |
3744 | ceph_osdc_put_request(req); | |
788e2df3 AE |
3745 | return ret; |
3746 | } | |
3747 | ||
602adf40 | 3748 | /* |
662518b1 AE |
3749 | * Read the complete header for the given rbd device. On successful |
3750 | * return, the rbd_dev->header field will contain up-to-date | |
3751 | * information about the image. | |
602adf40 | 3752 | */ |
99a41ebc | 3753 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3754 | { |
4156d998 | 3755 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3756 | u32 snap_count = 0; |
4156d998 AE |
3757 | u64 names_size = 0; |
3758 | u32 want_count; | |
3759 | int ret; | |
602adf40 | 3760 | |
00f1f36f | 3761 | /* |
4156d998 AE |
3762 | * The complete header will include an array of its 64-bit |
3763 | * snapshot ids, followed by the names of those snapshots as | |
3764 | * a contiguous block of NUL-terminated strings. Note that | |
3765 | * the number of snapshots could change by the time we read | |
3766 | * it in, in which case we re-read it. | |
00f1f36f | 3767 | */ |
4156d998 AE |
3768 | do { |
3769 | size_t size; | |
3770 | ||
3771 | kfree(ondisk); | |
3772 | ||
3773 | size = sizeof (*ondisk); | |
3774 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3775 | size += names_size; | |
3776 | ondisk = kmalloc(size, GFP_KERNEL); | |
3777 | if (!ondisk) | |
662518b1 | 3778 | return -ENOMEM; |
4156d998 | 3779 | |
fe5478e0 ID |
3780 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
3781 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 3782 | if (ret < 0) |
662518b1 | 3783 | goto out; |
c0cd10db | 3784 | if ((size_t)ret < size) { |
4156d998 | 3785 | ret = -ENXIO; |
06ecc6cb AE |
3786 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3787 | size, ret); | |
662518b1 | 3788 | goto out; |
4156d998 AE |
3789 | } |
3790 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3791 | ret = -ENXIO; | |
06ecc6cb | 3792 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3793 | goto out; |
81e759fb | 3794 | } |
602adf40 | 3795 | |
4156d998 AE |
3796 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3797 | want_count = snap_count; | |
3798 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3799 | } while (snap_count != want_count); | |
00f1f36f | 3800 | |
662518b1 AE |
3801 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3802 | out: | |
4156d998 AE |
3803 | kfree(ondisk); |
3804 | ||
3805 | return ret; | |
602adf40 YS |
3806 | } |
3807 | ||
15228ede AE |
3808 | /* |
3809 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3810 | * has disappeared from the (just updated) snapshot context. | |
3811 | */ | |
3812 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3813 | { | |
3814 | u64 snap_id; | |
3815 | ||
3816 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3817 | return; | |
3818 | ||
3819 | snap_id = rbd_dev->spec->snap_id; | |
3820 | if (snap_id == CEPH_NOSNAP) | |
3821 | return; | |
3822 | ||
3823 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3824 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3825 | } | |
3826 | ||
9875201e JD |
3827 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3828 | { | |
3829 | sector_t size; | |
9875201e JD |
3830 | |
3831 | /* | |
811c6688 ID |
3832 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3833 | * try to update its size. If REMOVING is set, updating size | |
3834 | * is just useless work since the device can't be opened. | |
9875201e | 3835 | */ |
811c6688 ID |
3836 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3837 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3838 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3839 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3840 | set_capacity(rbd_dev->disk, size); | |
3841 | revalidate_disk(rbd_dev->disk); | |
3842 | } | |
3843 | } | |
3844 | ||
cc4a38bd | 3845 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3846 | { |
e627db08 | 3847 | u64 mapping_size; |
1fe5e993 AE |
3848 | int ret; |
3849 | ||
cfbf6377 | 3850 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3851 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3852 | |
3853 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 3854 | if (ret) |
73e39e4d | 3855 | goto out; |
15228ede | 3856 | |
e8f59b59 ID |
3857 | /* |
3858 | * If there is a parent, see if it has disappeared due to the | |
3859 | * mapped image getting flattened. | |
3860 | */ | |
3861 | if (rbd_dev->parent) { | |
3862 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3863 | if (ret) | |
73e39e4d | 3864 | goto out; |
e8f59b59 ID |
3865 | } |
3866 | ||
5ff1108c | 3867 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 3868 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
3869 | } else { |
3870 | /* validate mapped snapshot's EXISTS flag */ | |
3871 | rbd_exists_validate(rbd_dev); | |
3872 | } | |
15228ede | 3873 | |
73e39e4d | 3874 | out: |
cfbf6377 | 3875 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 3876 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 3877 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3878 | |
73e39e4d | 3879 | return ret; |
1fe5e993 AE |
3880 | } |
3881 | ||
d6296d39 CH |
3882 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
3883 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
3884 | { |
3885 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
3886 | ||
3887 | INIT_WORK(work, rbd_queue_workfn); | |
3888 | return 0; | |
3889 | } | |
3890 | ||
f363b089 | 3891 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 3892 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
3893 | .init_request = rbd_init_request, |
3894 | }; | |
3895 | ||
602adf40 YS |
3896 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3897 | { | |
3898 | struct gendisk *disk; | |
3899 | struct request_queue *q; | |
593a9e7b | 3900 | u64 segment_size; |
7ad18afa | 3901 | int err; |
602adf40 | 3902 | |
602adf40 | 3903 | /* create gendisk info */ |
7e513d43 ID |
3904 | disk = alloc_disk(single_major ? |
3905 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3906 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3907 | if (!disk) |
1fcdb8aa | 3908 | return -ENOMEM; |
602adf40 | 3909 | |
f0f8cef5 | 3910 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3911 | rbd_dev->dev_id); |
602adf40 | 3912 | disk->major = rbd_dev->major; |
dd82fff1 | 3913 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3914 | if (single_major) |
3915 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3916 | disk->fops = &rbd_bd_ops; |
3917 | disk->private_data = rbd_dev; | |
3918 | ||
7ad18afa CH |
3919 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
3920 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 3921 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 3922 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 3923 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
3924 | rbd_dev->tag_set.nr_hw_queues = 1; |
3925 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
3926 | ||
3927 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
3928 | if (err) | |
602adf40 | 3929 | goto out_disk; |
029bcbd8 | 3930 | |
7ad18afa CH |
3931 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
3932 | if (IS_ERR(q)) { | |
3933 | err = PTR_ERR(q); | |
3934 | goto out_tag_set; | |
3935 | } | |
3936 | ||
d8a2c89c ID |
3937 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
3938 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ | |
593a9e7b | 3939 | |
029bcbd8 | 3940 | /* set io sizes to object size */ |
593a9e7b AE |
3941 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3942 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
0d9fde4f | 3943 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 3944 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 3945 | blk_queue_max_segment_size(q, UINT_MAX); |
593a9e7b AE |
3946 | blk_queue_io_min(q, segment_size); |
3947 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3948 | |
90e98c52 GZ |
3949 | /* enable the discard support */ |
3950 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
3951 | q->limits.discard_granularity = segment_size; | |
2bb4cd5c | 3952 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
6ac56951 | 3953 | blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE); |
90e98c52 | 3954 | |
bae818ee | 3955 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 3956 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 3957 | |
5769ed0c ID |
3958 | /* |
3959 | * disk_release() expects a queue ref from add_disk() and will | |
3960 | * put it. Hold an extra ref until add_disk() is called. | |
3961 | */ | |
3962 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 3963 | disk->queue = q; |
602adf40 YS |
3964 | q->queuedata = rbd_dev; |
3965 | ||
3966 | rbd_dev->disk = disk; | |
602adf40 | 3967 | |
602adf40 | 3968 | return 0; |
7ad18afa CH |
3969 | out_tag_set: |
3970 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
3971 | out_disk: |
3972 | put_disk(disk); | |
7ad18afa | 3973 | return err; |
602adf40 YS |
3974 | } |
3975 | ||
dfc5606d YS |
3976 | /* |
3977 | sysfs | |
3978 | */ | |
3979 | ||
593a9e7b AE |
3980 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3981 | { | |
3982 | return container_of(dev, struct rbd_device, dev); | |
3983 | } | |
3984 | ||
dfc5606d YS |
3985 | static ssize_t rbd_size_show(struct device *dev, |
3986 | struct device_attribute *attr, char *buf) | |
3987 | { | |
593a9e7b | 3988 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3989 | |
fc71d833 AE |
3990 | return sprintf(buf, "%llu\n", |
3991 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3992 | } |
3993 | ||
34b13184 AE |
3994 | /* |
3995 | * Note this shows the features for whatever's mapped, which is not | |
3996 | * necessarily the base image. | |
3997 | */ | |
3998 | static ssize_t rbd_features_show(struct device *dev, | |
3999 | struct device_attribute *attr, char *buf) | |
4000 | { | |
4001 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4002 | ||
4003 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4004 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4005 | } |
4006 | ||
dfc5606d YS |
4007 | static ssize_t rbd_major_show(struct device *dev, |
4008 | struct device_attribute *attr, char *buf) | |
4009 | { | |
593a9e7b | 4010 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4011 | |
fc71d833 AE |
4012 | if (rbd_dev->major) |
4013 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4014 | ||
4015 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4016 | } |
4017 | ||
4018 | static ssize_t rbd_minor_show(struct device *dev, | |
4019 | struct device_attribute *attr, char *buf) | |
4020 | { | |
4021 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4022 | |
dd82fff1 | 4023 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4024 | } |
4025 | ||
005a07bf ID |
4026 | static ssize_t rbd_client_addr_show(struct device *dev, |
4027 | struct device_attribute *attr, char *buf) | |
4028 | { | |
4029 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4030 | struct ceph_entity_addr *client_addr = | |
4031 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4032 | ||
4033 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4034 | le32_to_cpu(client_addr->nonce)); | |
4035 | } | |
4036 | ||
dfc5606d YS |
4037 | static ssize_t rbd_client_id_show(struct device *dev, |
4038 | struct device_attribute *attr, char *buf) | |
602adf40 | 4039 | { |
593a9e7b | 4040 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4041 | |
1dbb4399 | 4042 | return sprintf(buf, "client%lld\n", |
033268a5 | 4043 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4044 | } |
4045 | ||
267fb90b MC |
4046 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4047 | struct device_attribute *attr, char *buf) | |
4048 | { | |
4049 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4050 | ||
4051 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4052 | } | |
4053 | ||
0d6d1e9c MC |
4054 | static ssize_t rbd_config_info_show(struct device *dev, |
4055 | struct device_attribute *attr, char *buf) | |
4056 | { | |
4057 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4058 | ||
4059 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4060 | } |
4061 | ||
dfc5606d YS |
4062 | static ssize_t rbd_pool_show(struct device *dev, |
4063 | struct device_attribute *attr, char *buf) | |
602adf40 | 4064 | { |
593a9e7b | 4065 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4066 | |
0d7dbfce | 4067 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4068 | } |
4069 | ||
9bb2f334 AE |
4070 | static ssize_t rbd_pool_id_show(struct device *dev, |
4071 | struct device_attribute *attr, char *buf) | |
4072 | { | |
4073 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4074 | ||
0d7dbfce | 4075 | return sprintf(buf, "%llu\n", |
fc71d833 | 4076 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4077 | } |
4078 | ||
dfc5606d YS |
4079 | static ssize_t rbd_name_show(struct device *dev, |
4080 | struct device_attribute *attr, char *buf) | |
4081 | { | |
593a9e7b | 4082 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4083 | |
a92ffdf8 AE |
4084 | if (rbd_dev->spec->image_name) |
4085 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4086 | ||
4087 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4088 | } |
4089 | ||
589d30e0 AE |
4090 | static ssize_t rbd_image_id_show(struct device *dev, |
4091 | struct device_attribute *attr, char *buf) | |
4092 | { | |
4093 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4094 | ||
0d7dbfce | 4095 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4096 | } |
4097 | ||
34b13184 AE |
4098 | /* |
4099 | * Shows the name of the currently-mapped snapshot (or | |
4100 | * RBD_SNAP_HEAD_NAME for the base image). | |
4101 | */ | |
dfc5606d YS |
4102 | static ssize_t rbd_snap_show(struct device *dev, |
4103 | struct device_attribute *attr, | |
4104 | char *buf) | |
4105 | { | |
593a9e7b | 4106 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4107 | |
0d7dbfce | 4108 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4109 | } |
4110 | ||
92a58671 MC |
4111 | static ssize_t rbd_snap_id_show(struct device *dev, |
4112 | struct device_attribute *attr, char *buf) | |
4113 | { | |
4114 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4115 | ||
4116 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4117 | } | |
4118 | ||
86b00e0d | 4119 | /* |
ff96128f ID |
4120 | * For a v2 image, shows the chain of parent images, separated by empty |
4121 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4122 | * image)". | |
86b00e0d AE |
4123 | */ |
4124 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4125 | struct device_attribute *attr, |
4126 | char *buf) | |
86b00e0d AE |
4127 | { |
4128 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4129 | ssize_t count = 0; |
86b00e0d | 4130 | |
ff96128f | 4131 | if (!rbd_dev->parent) |
86b00e0d AE |
4132 | return sprintf(buf, "(no parent image)\n"); |
4133 | ||
ff96128f ID |
4134 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4135 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4136 | ||
4137 | count += sprintf(&buf[count], "%s" | |
4138 | "pool_id %llu\npool_name %s\n" | |
4139 | "image_id %s\nimage_name %s\n" | |
4140 | "snap_id %llu\nsnap_name %s\n" | |
4141 | "overlap %llu\n", | |
4142 | !count ? "" : "\n", /* first? */ | |
4143 | spec->pool_id, spec->pool_name, | |
4144 | spec->image_id, spec->image_name ?: "(unknown)", | |
4145 | spec->snap_id, spec->snap_name, | |
4146 | rbd_dev->parent_overlap); | |
4147 | } | |
4148 | ||
4149 | return count; | |
86b00e0d AE |
4150 | } |
4151 | ||
dfc5606d YS |
4152 | static ssize_t rbd_image_refresh(struct device *dev, |
4153 | struct device_attribute *attr, | |
4154 | const char *buf, | |
4155 | size_t size) | |
4156 | { | |
593a9e7b | 4157 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4158 | int ret; |
602adf40 | 4159 | |
cc4a38bd | 4160 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4161 | if (ret) |
52bb1f9b | 4162 | return ret; |
b813623a | 4163 | |
52bb1f9b | 4164 | return size; |
dfc5606d | 4165 | } |
602adf40 | 4166 | |
dfc5606d | 4167 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 4168 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 4169 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 4170 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
005a07bf | 4171 | static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
dfc5606d | 4172 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
267fb90b | 4173 | static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
0d6d1e9c | 4174 | static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL); |
dfc5606d | 4175 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
9bb2f334 | 4176 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 4177 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 4178 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
4179 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
4180 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
92a58671 | 4181 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
86b00e0d | 4182 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
4183 | |
4184 | static struct attribute *rbd_attrs[] = { | |
4185 | &dev_attr_size.attr, | |
34b13184 | 4186 | &dev_attr_features.attr, |
dfc5606d | 4187 | &dev_attr_major.attr, |
dd82fff1 | 4188 | &dev_attr_minor.attr, |
005a07bf | 4189 | &dev_attr_client_addr.attr, |
dfc5606d | 4190 | &dev_attr_client_id.attr, |
267fb90b | 4191 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4192 | &dev_attr_config_info.attr, |
dfc5606d | 4193 | &dev_attr_pool.attr, |
9bb2f334 | 4194 | &dev_attr_pool_id.attr, |
dfc5606d | 4195 | &dev_attr_name.attr, |
589d30e0 | 4196 | &dev_attr_image_id.attr, |
dfc5606d | 4197 | &dev_attr_current_snap.attr, |
92a58671 | 4198 | &dev_attr_snap_id.attr, |
86b00e0d | 4199 | &dev_attr_parent.attr, |
dfc5606d | 4200 | &dev_attr_refresh.attr, |
dfc5606d YS |
4201 | NULL |
4202 | }; | |
4203 | ||
4204 | static struct attribute_group rbd_attr_group = { | |
4205 | .attrs = rbd_attrs, | |
4206 | }; | |
4207 | ||
4208 | static const struct attribute_group *rbd_attr_groups[] = { | |
4209 | &rbd_attr_group, | |
4210 | NULL | |
4211 | }; | |
4212 | ||
6cac4695 | 4213 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4214 | |
b9942bc9 | 4215 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4216 | .name = "rbd", |
4217 | .groups = rbd_attr_groups, | |
6cac4695 | 4218 | .release = rbd_dev_release, |
dfc5606d YS |
4219 | }; |
4220 | ||
8b8fb99c AE |
4221 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4222 | { | |
4223 | kref_get(&spec->kref); | |
4224 | ||
4225 | return spec; | |
4226 | } | |
4227 | ||
4228 | static void rbd_spec_free(struct kref *kref); | |
4229 | static void rbd_spec_put(struct rbd_spec *spec) | |
4230 | { | |
4231 | if (spec) | |
4232 | kref_put(&spec->kref, rbd_spec_free); | |
4233 | } | |
4234 | ||
4235 | static struct rbd_spec *rbd_spec_alloc(void) | |
4236 | { | |
4237 | struct rbd_spec *spec; | |
4238 | ||
4239 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4240 | if (!spec) | |
4241 | return NULL; | |
04077599 ID |
4242 | |
4243 | spec->pool_id = CEPH_NOPOOL; | |
4244 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4245 | kref_init(&spec->kref); |
4246 | ||
8b8fb99c AE |
4247 | return spec; |
4248 | } | |
4249 | ||
4250 | static void rbd_spec_free(struct kref *kref) | |
4251 | { | |
4252 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4253 | ||
4254 | kfree(spec->pool_name); | |
4255 | kfree(spec->image_id); | |
4256 | kfree(spec->image_name); | |
4257 | kfree(spec->snap_name); | |
4258 | kfree(spec); | |
4259 | } | |
4260 | ||
1643dfa4 | 4261 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4262 | { |
99d16943 | 4263 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4264 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4265 | |
c41d13a3 | 4266 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4267 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4268 | kfree(rbd_dev->config_info); |
c41d13a3 | 4269 | |
dd5ac32d ID |
4270 | rbd_put_client(rbd_dev->rbd_client); |
4271 | rbd_spec_put(rbd_dev->spec); | |
4272 | kfree(rbd_dev->opts); | |
4273 | kfree(rbd_dev); | |
1643dfa4 ID |
4274 | } |
4275 | ||
4276 | static void rbd_dev_release(struct device *dev) | |
4277 | { | |
4278 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4279 | bool need_put = !!rbd_dev->opts; | |
4280 | ||
4281 | if (need_put) { | |
4282 | destroy_workqueue(rbd_dev->task_wq); | |
4283 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4284 | } | |
4285 | ||
4286 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4287 | |
4288 | /* | |
4289 | * This is racy, but way better than putting module outside of | |
4290 | * the release callback. The race window is pretty small, so | |
4291 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4292 | */ | |
4293 | if (need_put) | |
4294 | module_put(THIS_MODULE); | |
4295 | } | |
4296 | ||
1643dfa4 ID |
4297 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4298 | struct rbd_spec *spec) | |
c53d5893 AE |
4299 | { |
4300 | struct rbd_device *rbd_dev; | |
4301 | ||
1643dfa4 | 4302 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4303 | if (!rbd_dev) |
4304 | return NULL; | |
4305 | ||
4306 | spin_lock_init(&rbd_dev->lock); | |
4307 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4308 | init_rwsem(&rbd_dev->header_rwsem); |
4309 | ||
7e97332e | 4310 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4311 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4312 | rbd_dev->header_oloc.pool = spec->pool_id; |
c41d13a3 | 4313 | |
99d16943 ID |
4314 | mutex_init(&rbd_dev->watch_mutex); |
4315 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4316 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4317 | ||
ed95b21a ID |
4318 | init_rwsem(&rbd_dev->lock_rwsem); |
4319 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4320 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4321 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4322 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4323 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4324 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4325 | ||
dd5ac32d ID |
4326 | rbd_dev->dev.bus = &rbd_bus_type; |
4327 | rbd_dev->dev.type = &rbd_device_type; | |
4328 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4329 | device_initialize(&rbd_dev->dev); |
4330 | ||
c53d5893 | 4331 | rbd_dev->rbd_client = rbdc; |
d147543d | 4332 | rbd_dev->spec = spec; |
0903e875 | 4333 | |
1643dfa4 ID |
4334 | return rbd_dev; |
4335 | } | |
4336 | ||
4337 | /* | |
4338 | * Create a mapping rbd_dev. | |
4339 | */ | |
4340 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4341 | struct rbd_spec *spec, | |
4342 | struct rbd_options *opts) | |
4343 | { | |
4344 | struct rbd_device *rbd_dev; | |
4345 | ||
4346 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4347 | if (!rbd_dev) | |
4348 | return NULL; | |
4349 | ||
4350 | rbd_dev->opts = opts; | |
4351 | ||
4352 | /* get an id and fill in device name */ | |
4353 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4354 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4355 | GFP_KERNEL); | |
4356 | if (rbd_dev->dev_id < 0) | |
4357 | goto fail_rbd_dev; | |
4358 | ||
4359 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4360 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4361 | rbd_dev->name); | |
4362 | if (!rbd_dev->task_wq) | |
4363 | goto fail_dev_id; | |
dd5ac32d | 4364 | |
1643dfa4 ID |
4365 | /* we have a ref from do_rbd_add() */ |
4366 | __module_get(THIS_MODULE); | |
dd5ac32d | 4367 | |
1643dfa4 | 4368 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4369 | return rbd_dev; |
1643dfa4 ID |
4370 | |
4371 | fail_dev_id: | |
4372 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4373 | fail_rbd_dev: | |
4374 | rbd_dev_free(rbd_dev); | |
4375 | return NULL; | |
c53d5893 AE |
4376 | } |
4377 | ||
4378 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4379 | { | |
dd5ac32d ID |
4380 | if (rbd_dev) |
4381 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4382 | } |
4383 | ||
9d475de5 AE |
4384 | /* |
4385 | * Get the size and object order for an image snapshot, or if | |
4386 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4387 | * image. | |
4388 | */ | |
4389 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4390 | u8 *order, u64 *snap_size) | |
4391 | { | |
4392 | __le64 snapid = cpu_to_le64(snap_id); | |
4393 | int ret; | |
4394 | struct { | |
4395 | u8 order; | |
4396 | __le64 size; | |
4397 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4398 | ||
ecd4a68a ID |
4399 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4400 | &rbd_dev->header_oloc, "get_size", | |
4401 | &snapid, sizeof(snapid), | |
4402 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4403 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4404 | if (ret < 0) |
4405 | return ret; | |
57385b51 AE |
4406 | if (ret < sizeof (size_buf)) |
4407 | return -ERANGE; | |
9d475de5 | 4408 | |
c3545579 | 4409 | if (order) { |
c86f86e9 | 4410 | *order = size_buf.order; |
c3545579 JD |
4411 | dout(" order %u", (unsigned int)*order); |
4412 | } | |
9d475de5 AE |
4413 | *snap_size = le64_to_cpu(size_buf.size); |
4414 | ||
c3545579 JD |
4415 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4416 | (unsigned long long)snap_id, | |
57385b51 | 4417 | (unsigned long long)*snap_size); |
9d475de5 AE |
4418 | |
4419 | return 0; | |
4420 | } | |
4421 | ||
4422 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4423 | { | |
4424 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4425 | &rbd_dev->header.obj_order, | |
4426 | &rbd_dev->header.image_size); | |
4427 | } | |
4428 | ||
1e130199 AE |
4429 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4430 | { | |
4431 | void *reply_buf; | |
4432 | int ret; | |
4433 | void *p; | |
4434 | ||
4435 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4436 | if (!reply_buf) | |
4437 | return -ENOMEM; | |
4438 | ||
ecd4a68a ID |
4439 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4440 | &rbd_dev->header_oloc, "get_object_prefix", | |
4441 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4442 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4443 | if (ret < 0) |
4444 | goto out; | |
4445 | ||
4446 | p = reply_buf; | |
4447 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4448 | p + ret, NULL, GFP_NOIO); |
4449 | ret = 0; | |
1e130199 AE |
4450 | |
4451 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4452 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4453 | rbd_dev->header.object_prefix = NULL; | |
4454 | } else { | |
4455 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4456 | } | |
1e130199 AE |
4457 | out: |
4458 | kfree(reply_buf); | |
4459 | ||
4460 | return ret; | |
4461 | } | |
4462 | ||
b1b5402a AE |
4463 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4464 | u64 *snap_features) | |
4465 | { | |
4466 | __le64 snapid = cpu_to_le64(snap_id); | |
4467 | struct { | |
4468 | __le64 features; | |
4469 | __le64 incompat; | |
4157976b | 4470 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4471 | u64 unsup; |
b1b5402a AE |
4472 | int ret; |
4473 | ||
ecd4a68a ID |
4474 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4475 | &rbd_dev->header_oloc, "get_features", | |
4476 | &snapid, sizeof(snapid), | |
4477 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4478 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4479 | if (ret < 0) |
4480 | return ret; | |
57385b51 AE |
4481 | if (ret < sizeof (features_buf)) |
4482 | return -ERANGE; | |
d889140c | 4483 | |
d3767f0f ID |
4484 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4485 | if (unsup) { | |
4486 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4487 | unsup); | |
b8f5c6ed | 4488 | return -ENXIO; |
d3767f0f | 4489 | } |
d889140c | 4490 | |
b1b5402a AE |
4491 | *snap_features = le64_to_cpu(features_buf.features); |
4492 | ||
4493 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4494 | (unsigned long long)snap_id, |
4495 | (unsigned long long)*snap_features, | |
4496 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4497 | |
4498 | return 0; | |
4499 | } | |
4500 | ||
4501 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4502 | { | |
4503 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4504 | &rbd_dev->header.features); | |
4505 | } | |
4506 | ||
86b00e0d AE |
4507 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4508 | { | |
4509 | struct rbd_spec *parent_spec; | |
4510 | size_t size; | |
4511 | void *reply_buf = NULL; | |
4512 | __le64 snapid; | |
4513 | void *p; | |
4514 | void *end; | |
642a2537 | 4515 | u64 pool_id; |
86b00e0d | 4516 | char *image_id; |
3b5cf2a2 | 4517 | u64 snap_id; |
86b00e0d | 4518 | u64 overlap; |
86b00e0d AE |
4519 | int ret; |
4520 | ||
4521 | parent_spec = rbd_spec_alloc(); | |
4522 | if (!parent_spec) | |
4523 | return -ENOMEM; | |
4524 | ||
4525 | size = sizeof (__le64) + /* pool_id */ | |
4526 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4527 | sizeof (__le64) + /* snap_id */ | |
4528 | sizeof (__le64); /* overlap */ | |
4529 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4530 | if (!reply_buf) { | |
4531 | ret = -ENOMEM; | |
4532 | goto out_err; | |
4533 | } | |
4534 | ||
4d9b67cd | 4535 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
ecd4a68a ID |
4536 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4537 | &rbd_dev->header_oloc, "get_parent", | |
4538 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4539 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4540 | if (ret < 0) |
4541 | goto out_err; | |
4542 | ||
86b00e0d | 4543 | p = reply_buf; |
57385b51 AE |
4544 | end = reply_buf + ret; |
4545 | ret = -ERANGE; | |
642a2537 | 4546 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4547 | if (pool_id == CEPH_NOPOOL) { |
4548 | /* | |
4549 | * Either the parent never existed, or we have | |
4550 | * record of it but the image got flattened so it no | |
4551 | * longer has a parent. When the parent of a | |
4552 | * layered image disappears we immediately set the | |
4553 | * overlap to 0. The effect of this is that all new | |
4554 | * requests will be treated as if the image had no | |
4555 | * parent. | |
4556 | */ | |
4557 | if (rbd_dev->parent_overlap) { | |
4558 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4559 | rbd_dev_parent_put(rbd_dev); |
4560 | pr_info("%s: clone image has been flattened\n", | |
4561 | rbd_dev->disk->disk_name); | |
4562 | } | |
4563 | ||
86b00e0d | 4564 | goto out; /* No parent? No problem. */ |
392a9dad | 4565 | } |
86b00e0d | 4566 | |
0903e875 AE |
4567 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4568 | ||
4569 | ret = -EIO; | |
642a2537 | 4570 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4571 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4572 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4573 | goto out_err; |
c0cd10db | 4574 | } |
0903e875 | 4575 | |
979ed480 | 4576 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4577 | if (IS_ERR(image_id)) { |
4578 | ret = PTR_ERR(image_id); | |
4579 | goto out_err; | |
4580 | } | |
3b5cf2a2 | 4581 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4582 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4583 | ||
3b5cf2a2 AE |
4584 | /* |
4585 | * The parent won't change (except when the clone is | |
4586 | * flattened, already handled that). So we only need to | |
4587 | * record the parent spec we have not already done so. | |
4588 | */ | |
4589 | if (!rbd_dev->parent_spec) { | |
4590 | parent_spec->pool_id = pool_id; | |
4591 | parent_spec->image_id = image_id; | |
4592 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4593 | rbd_dev->parent_spec = parent_spec; |
4594 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4595 | } else { |
4596 | kfree(image_id); | |
3b5cf2a2 AE |
4597 | } |
4598 | ||
4599 | /* | |
cf32bd9c ID |
4600 | * We always update the parent overlap. If it's zero we issue |
4601 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4602 | */ |
3b5cf2a2 | 4603 | if (!overlap) { |
3b5cf2a2 | 4604 | if (parent_spec) { |
cf32bd9c ID |
4605 | /* refresh, careful to warn just once */ |
4606 | if (rbd_dev->parent_overlap) | |
4607 | rbd_warn(rbd_dev, | |
4608 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4609 | } else { |
cf32bd9c ID |
4610 | /* initial probe */ |
4611 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4612 | } |
70cf49cf | 4613 | } |
cf32bd9c ID |
4614 | rbd_dev->parent_overlap = overlap; |
4615 | ||
86b00e0d AE |
4616 | out: |
4617 | ret = 0; | |
4618 | out_err: | |
4619 | kfree(reply_buf); | |
4620 | rbd_spec_put(parent_spec); | |
4621 | ||
4622 | return ret; | |
4623 | } | |
4624 | ||
cc070d59 AE |
4625 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4626 | { | |
4627 | struct { | |
4628 | __le64 stripe_unit; | |
4629 | __le64 stripe_count; | |
4630 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4631 | size_t size = sizeof (striping_info_buf); | |
4632 | void *p; | |
4633 | u64 obj_size; | |
4634 | u64 stripe_unit; | |
4635 | u64 stripe_count; | |
4636 | int ret; | |
4637 | ||
ecd4a68a ID |
4638 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4639 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
4640 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
4641 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4642 | if (ret < 0) | |
4643 | return ret; | |
4644 | if (ret < size) | |
4645 | return -ERANGE; | |
4646 | ||
4647 | /* | |
4648 | * We don't actually support the "fancy striping" feature | |
4649 | * (STRIPINGV2) yet, but if the striping sizes are the | |
4650 | * defaults the behavior is the same as before. So find | |
4651 | * out, and only fail if the image has non-default values. | |
4652 | */ | |
4653 | ret = -EINVAL; | |
5bc3fb17 | 4654 | obj_size = rbd_obj_bytes(&rbd_dev->header); |
cc070d59 AE |
4655 | p = &striping_info_buf; |
4656 | stripe_unit = ceph_decode_64(&p); | |
4657 | if (stripe_unit != obj_size) { | |
4658 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
4659 | "(got %llu want %llu)", | |
4660 | stripe_unit, obj_size); | |
4661 | return -EINVAL; | |
4662 | } | |
4663 | stripe_count = ceph_decode_64(&p); | |
4664 | if (stripe_count != 1) { | |
4665 | rbd_warn(rbd_dev, "unsupported stripe count " | |
4666 | "(got %llu want 1)", stripe_count); | |
4667 | return -EINVAL; | |
4668 | } | |
500d0c0f AE |
4669 | rbd_dev->header.stripe_unit = stripe_unit; |
4670 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
4671 | |
4672 | return 0; | |
4673 | } | |
4674 | ||
7e97332e ID |
4675 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
4676 | { | |
4677 | __le64 data_pool_id; | |
4678 | int ret; | |
4679 | ||
4680 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
4681 | &rbd_dev->header_oloc, "get_data_pool", | |
4682 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
4683 | if (ret < 0) | |
4684 | return ret; | |
4685 | if (ret < sizeof(data_pool_id)) | |
4686 | return -EBADMSG; | |
4687 | ||
4688 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
4689 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
4690 | return 0; | |
4691 | } | |
4692 | ||
9e15b77d AE |
4693 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4694 | { | |
ecd4a68a | 4695 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
4696 | size_t image_id_size; |
4697 | char *image_id; | |
4698 | void *p; | |
4699 | void *end; | |
4700 | size_t size; | |
4701 | void *reply_buf = NULL; | |
4702 | size_t len = 0; | |
4703 | char *image_name = NULL; | |
4704 | int ret; | |
4705 | ||
4706 | rbd_assert(!rbd_dev->spec->image_name); | |
4707 | ||
69e7a02f AE |
4708 | len = strlen(rbd_dev->spec->image_id); |
4709 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4710 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4711 | if (!image_id) | |
4712 | return NULL; | |
4713 | ||
4714 | p = image_id; | |
4157976b | 4715 | end = image_id + image_id_size; |
57385b51 | 4716 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4717 | |
4718 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4719 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4720 | if (!reply_buf) | |
4721 | goto out; | |
4722 | ||
ecd4a68a ID |
4723 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
4724 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
4725 | "dir_get_name", image_id, image_id_size, | |
4726 | reply_buf, size); | |
9e15b77d AE |
4727 | if (ret < 0) |
4728 | goto out; | |
4729 | p = reply_buf; | |
f40eb349 AE |
4730 | end = reply_buf + ret; |
4731 | ||
9e15b77d AE |
4732 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4733 | if (IS_ERR(image_name)) | |
4734 | image_name = NULL; | |
4735 | else | |
4736 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4737 | out: | |
4738 | kfree(reply_buf); | |
4739 | kfree(image_id); | |
4740 | ||
4741 | return image_name; | |
4742 | } | |
4743 | ||
2ad3d716 AE |
4744 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4745 | { | |
4746 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4747 | const char *snap_name; | |
4748 | u32 which = 0; | |
4749 | ||
4750 | /* Skip over names until we find the one we are looking for */ | |
4751 | ||
4752 | snap_name = rbd_dev->header.snap_names; | |
4753 | while (which < snapc->num_snaps) { | |
4754 | if (!strcmp(name, snap_name)) | |
4755 | return snapc->snaps[which]; | |
4756 | snap_name += strlen(snap_name) + 1; | |
4757 | which++; | |
4758 | } | |
4759 | return CEPH_NOSNAP; | |
4760 | } | |
4761 | ||
4762 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4763 | { | |
4764 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4765 | u32 which; | |
4766 | bool found = false; | |
4767 | u64 snap_id; | |
4768 | ||
4769 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4770 | const char *snap_name; | |
4771 | ||
4772 | snap_id = snapc->snaps[which]; | |
4773 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4774 | if (IS_ERR(snap_name)) { |
4775 | /* ignore no-longer existing snapshots */ | |
4776 | if (PTR_ERR(snap_name) == -ENOENT) | |
4777 | continue; | |
4778 | else | |
4779 | break; | |
4780 | } | |
2ad3d716 AE |
4781 | found = !strcmp(name, snap_name); |
4782 | kfree(snap_name); | |
4783 | } | |
4784 | return found ? snap_id : CEPH_NOSNAP; | |
4785 | } | |
4786 | ||
4787 | /* | |
4788 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4789 | * no snapshot by that name is found, or if an error occurs. | |
4790 | */ | |
4791 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4792 | { | |
4793 | if (rbd_dev->image_format == 1) | |
4794 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4795 | ||
4796 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4797 | } | |
4798 | ||
9e15b77d | 4799 | /* |
04077599 ID |
4800 | * An image being mapped will have everything but the snap id. |
4801 | */ | |
4802 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4803 | { | |
4804 | struct rbd_spec *spec = rbd_dev->spec; | |
4805 | ||
4806 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4807 | rbd_assert(spec->image_id && spec->image_name); | |
4808 | rbd_assert(spec->snap_name); | |
4809 | ||
4810 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4811 | u64 snap_id; | |
4812 | ||
4813 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4814 | if (snap_id == CEPH_NOSNAP) | |
4815 | return -ENOENT; | |
4816 | ||
4817 | spec->snap_id = snap_id; | |
4818 | } else { | |
4819 | spec->snap_id = CEPH_NOSNAP; | |
4820 | } | |
4821 | ||
4822 | return 0; | |
4823 | } | |
4824 | ||
4825 | /* | |
4826 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4827 | * |
04077599 ID |
4828 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4829 | * can't figure out the name for an image id. | |
9e15b77d | 4830 | */ |
04077599 | 4831 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4832 | { |
2e9f7f1c AE |
4833 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4834 | struct rbd_spec *spec = rbd_dev->spec; | |
4835 | const char *pool_name; | |
4836 | const char *image_name; | |
4837 | const char *snap_name; | |
9e15b77d AE |
4838 | int ret; |
4839 | ||
04077599 ID |
4840 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4841 | rbd_assert(spec->image_id); | |
4842 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4843 | |
2e9f7f1c | 4844 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4845 | |
2e9f7f1c AE |
4846 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4847 | if (!pool_name) { | |
4848 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4849 | return -EIO; |
4850 | } | |
2e9f7f1c AE |
4851 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4852 | if (!pool_name) | |
9e15b77d AE |
4853 | return -ENOMEM; |
4854 | ||
4855 | /* Fetch the image name; tolerate failure here */ | |
4856 | ||
2e9f7f1c AE |
4857 | image_name = rbd_dev_image_name(rbd_dev); |
4858 | if (!image_name) | |
06ecc6cb | 4859 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4860 | |
04077599 | 4861 | /* Fetch the snapshot name */ |
9e15b77d | 4862 | |
2e9f7f1c | 4863 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4864 | if (IS_ERR(snap_name)) { |
4865 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4866 | goto out_err; |
2e9f7f1c AE |
4867 | } |
4868 | ||
4869 | spec->pool_name = pool_name; | |
4870 | spec->image_name = image_name; | |
4871 | spec->snap_name = snap_name; | |
9e15b77d AE |
4872 | |
4873 | return 0; | |
04077599 | 4874 | |
9e15b77d | 4875 | out_err: |
2e9f7f1c AE |
4876 | kfree(image_name); |
4877 | kfree(pool_name); | |
9e15b77d AE |
4878 | return ret; |
4879 | } | |
4880 | ||
cc4a38bd | 4881 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4882 | { |
4883 | size_t size; | |
4884 | int ret; | |
4885 | void *reply_buf; | |
4886 | void *p; | |
4887 | void *end; | |
4888 | u64 seq; | |
4889 | u32 snap_count; | |
4890 | struct ceph_snap_context *snapc; | |
4891 | u32 i; | |
4892 | ||
4893 | /* | |
4894 | * We'll need room for the seq value (maximum snapshot id), | |
4895 | * snapshot count, and array of that many snapshot ids. | |
4896 | * For now we have a fixed upper limit on the number we're | |
4897 | * prepared to receive. | |
4898 | */ | |
4899 | size = sizeof (__le64) + sizeof (__le32) + | |
4900 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4901 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4902 | if (!reply_buf) | |
4903 | return -ENOMEM; | |
4904 | ||
ecd4a68a ID |
4905 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4906 | &rbd_dev->header_oloc, "get_snapcontext", | |
4907 | NULL, 0, reply_buf, size); | |
36be9a76 | 4908 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4909 | if (ret < 0) |
4910 | goto out; | |
4911 | ||
35d489f9 | 4912 | p = reply_buf; |
57385b51 AE |
4913 | end = reply_buf + ret; |
4914 | ret = -ERANGE; | |
35d489f9 AE |
4915 | ceph_decode_64_safe(&p, end, seq, out); |
4916 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4917 | ||
4918 | /* | |
4919 | * Make sure the reported number of snapshot ids wouldn't go | |
4920 | * beyond the end of our buffer. But before checking that, | |
4921 | * make sure the computed size of the snapshot context we | |
4922 | * allocate is representable in a size_t. | |
4923 | */ | |
4924 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4925 | / sizeof (u64)) { | |
4926 | ret = -EINVAL; | |
4927 | goto out; | |
4928 | } | |
4929 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4930 | goto out; | |
468521c1 | 4931 | ret = 0; |
35d489f9 | 4932 | |
812164f8 | 4933 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4934 | if (!snapc) { |
4935 | ret = -ENOMEM; | |
4936 | goto out; | |
4937 | } | |
35d489f9 | 4938 | snapc->seq = seq; |
35d489f9 AE |
4939 | for (i = 0; i < snap_count; i++) |
4940 | snapc->snaps[i] = ceph_decode_64(&p); | |
4941 | ||
49ece554 | 4942 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4943 | rbd_dev->header.snapc = snapc; |
4944 | ||
4945 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4946 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4947 | out: |
4948 | kfree(reply_buf); | |
4949 | ||
57385b51 | 4950 | return ret; |
35d489f9 AE |
4951 | } |
4952 | ||
54cac61f AE |
4953 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4954 | u64 snap_id) | |
b8b1e2db AE |
4955 | { |
4956 | size_t size; | |
4957 | void *reply_buf; | |
54cac61f | 4958 | __le64 snapid; |
b8b1e2db AE |
4959 | int ret; |
4960 | void *p; | |
4961 | void *end; | |
b8b1e2db AE |
4962 | char *snap_name; |
4963 | ||
4964 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4965 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4966 | if (!reply_buf) | |
4967 | return ERR_PTR(-ENOMEM); | |
4968 | ||
54cac61f | 4969 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
4970 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4971 | &rbd_dev->header_oloc, "get_snapshot_name", | |
4972 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4973 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4974 | if (ret < 0) { |
4975 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4976 | goto out; |
f40eb349 | 4977 | } |
b8b1e2db AE |
4978 | |
4979 | p = reply_buf; | |
f40eb349 | 4980 | end = reply_buf + ret; |
e5c35534 | 4981 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4982 | if (IS_ERR(snap_name)) |
b8b1e2db | 4983 | goto out; |
b8b1e2db | 4984 | |
f40eb349 | 4985 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4986 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4987 | out: |
4988 | kfree(reply_buf); | |
4989 | ||
f40eb349 | 4990 | return snap_name; |
b8b1e2db AE |
4991 | } |
4992 | ||
2df3fac7 | 4993 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4994 | { |
2df3fac7 | 4995 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4996 | int ret; |
117973fb | 4997 | |
1617e40c JD |
4998 | ret = rbd_dev_v2_image_size(rbd_dev); |
4999 | if (ret) | |
cfbf6377 | 5000 | return ret; |
1617e40c | 5001 | |
2df3fac7 AE |
5002 | if (first_time) { |
5003 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5004 | if (ret) | |
cfbf6377 | 5005 | return ret; |
2df3fac7 AE |
5006 | } |
5007 | ||
cc4a38bd | 5008 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5009 | if (ret && first_time) { |
5010 | kfree(rbd_dev->header.object_prefix); | |
5011 | rbd_dev->header.object_prefix = NULL; | |
5012 | } | |
117973fb AE |
5013 | |
5014 | return ret; | |
5015 | } | |
5016 | ||
a720ae09 ID |
5017 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5018 | { | |
5019 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5020 | ||
5021 | if (rbd_dev->image_format == 1) | |
5022 | return rbd_dev_v1_header_info(rbd_dev); | |
5023 | ||
5024 | return rbd_dev_v2_header_info(rbd_dev); | |
5025 | } | |
5026 | ||
e28fff26 AE |
5027 | /* |
5028 | * Skips over white space at *buf, and updates *buf to point to the | |
5029 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5030 | * the token (string of non-white space characters) found. Note |
5031 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5032 | */ |
5033 | static inline size_t next_token(const char **buf) | |
5034 | { | |
5035 | /* | |
5036 | * These are the characters that produce nonzero for | |
5037 | * isspace() in the "C" and "POSIX" locales. | |
5038 | */ | |
5039 | const char *spaces = " \f\n\r\t\v"; | |
5040 | ||
5041 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5042 | ||
5043 | return strcspn(*buf, spaces); /* Return token length */ | |
5044 | } | |
5045 | ||
ea3352f4 AE |
5046 | /* |
5047 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5048 | * enough to hold a copy of it, and copies the token into the new | |
5049 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5050 | * that a duplicate buffer is created even for a zero-length token. | |
5051 | * | |
5052 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5053 | * pointer if memory for the duplicate was not available. If | |
5054 | * the lenp argument is a non-null pointer, the length of the token | |
5055 | * (not including the '\0') is returned in *lenp. | |
5056 | * | |
5057 | * If successful, the *buf pointer will be updated to point beyond | |
5058 | * the end of the found token. | |
5059 | * | |
5060 | * Note: uses GFP_KERNEL for allocation. | |
5061 | */ | |
5062 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5063 | { | |
5064 | char *dup; | |
5065 | size_t len; | |
5066 | ||
5067 | len = next_token(buf); | |
4caf35f9 | 5068 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5069 | if (!dup) |
5070 | return NULL; | |
ea3352f4 AE |
5071 | *(dup + len) = '\0'; |
5072 | *buf += len; | |
5073 | ||
5074 | if (lenp) | |
5075 | *lenp = len; | |
5076 | ||
5077 | return dup; | |
5078 | } | |
5079 | ||
a725f65e | 5080 | /* |
859c31df AE |
5081 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5082 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5083 | * and the data written is passed here via a NUL-terminated buffer. | |
5084 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5085 | * |
859c31df AE |
5086 | * The information extracted from these options is recorded in |
5087 | * the other parameters which return dynamically-allocated | |
5088 | * structures: | |
5089 | * ceph_opts | |
5090 | * The address of a pointer that will refer to a ceph options | |
5091 | * structure. Caller must release the returned pointer using | |
5092 | * ceph_destroy_options() when it is no longer needed. | |
5093 | * rbd_opts | |
5094 | * Address of an rbd options pointer. Fully initialized by | |
5095 | * this function; caller must release with kfree(). | |
5096 | * spec | |
5097 | * Address of an rbd image specification pointer. Fully | |
5098 | * initialized by this function based on parsed options. | |
5099 | * Caller must release with rbd_spec_put(). | |
5100 | * | |
5101 | * The options passed take this form: | |
5102 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5103 | * where: | |
5104 | * <mon_addrs> | |
5105 | * A comma-separated list of one or more monitor addresses. | |
5106 | * A monitor address is an ip address, optionally followed | |
5107 | * by a port number (separated by a colon). | |
5108 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5109 | * <options> | |
5110 | * A comma-separated list of ceph and/or rbd options. | |
5111 | * <pool_name> | |
5112 | * The name of the rados pool containing the rbd image. | |
5113 | * <image_name> | |
5114 | * The name of the image in that pool to map. | |
5115 | * <snap_id> | |
5116 | * An optional snapshot id. If provided, the mapping will | |
5117 | * present data from the image at the time that snapshot was | |
5118 | * created. The image head is used if no snapshot id is | |
5119 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5120 | */ |
859c31df | 5121 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5122 | struct ceph_options **ceph_opts, |
859c31df AE |
5123 | struct rbd_options **opts, |
5124 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5125 | { |
d22f76e7 | 5126 | size_t len; |
859c31df | 5127 | char *options; |
0ddebc0c | 5128 | const char *mon_addrs; |
ecb4dc22 | 5129 | char *snap_name; |
0ddebc0c | 5130 | size_t mon_addrs_size; |
859c31df | 5131 | struct rbd_spec *spec = NULL; |
4e9afeba | 5132 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5133 | struct ceph_options *copts; |
dc79b113 | 5134 | int ret; |
e28fff26 AE |
5135 | |
5136 | /* The first four tokens are required */ | |
5137 | ||
7ef3214a | 5138 | len = next_token(&buf); |
4fb5d671 AE |
5139 | if (!len) { |
5140 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5141 | return -EINVAL; | |
5142 | } | |
0ddebc0c | 5143 | mon_addrs = buf; |
f28e565a | 5144 | mon_addrs_size = len + 1; |
7ef3214a | 5145 | buf += len; |
a725f65e | 5146 | |
dc79b113 | 5147 | ret = -EINVAL; |
f28e565a AE |
5148 | options = dup_token(&buf, NULL); |
5149 | if (!options) | |
dc79b113 | 5150 | return -ENOMEM; |
4fb5d671 AE |
5151 | if (!*options) { |
5152 | rbd_warn(NULL, "no options provided"); | |
5153 | goto out_err; | |
5154 | } | |
e28fff26 | 5155 | |
859c31df AE |
5156 | spec = rbd_spec_alloc(); |
5157 | if (!spec) | |
f28e565a | 5158 | goto out_mem; |
859c31df AE |
5159 | |
5160 | spec->pool_name = dup_token(&buf, NULL); | |
5161 | if (!spec->pool_name) | |
5162 | goto out_mem; | |
4fb5d671 AE |
5163 | if (!*spec->pool_name) { |
5164 | rbd_warn(NULL, "no pool name provided"); | |
5165 | goto out_err; | |
5166 | } | |
e28fff26 | 5167 | |
69e7a02f | 5168 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 5169 | if (!spec->image_name) |
f28e565a | 5170 | goto out_mem; |
4fb5d671 AE |
5171 | if (!*spec->image_name) { |
5172 | rbd_warn(NULL, "no image name provided"); | |
5173 | goto out_err; | |
5174 | } | |
d4b125e9 | 5175 | |
f28e565a AE |
5176 | /* |
5177 | * Snapshot name is optional; default is to use "-" | |
5178 | * (indicating the head/no snapshot). | |
5179 | */ | |
3feeb894 | 5180 | len = next_token(&buf); |
820a5f3e | 5181 | if (!len) { |
3feeb894 AE |
5182 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5183 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5184 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5185 | ret = -ENAMETOOLONG; |
f28e565a | 5186 | goto out_err; |
849b4260 | 5187 | } |
ecb4dc22 AE |
5188 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5189 | if (!snap_name) | |
f28e565a | 5190 | goto out_mem; |
ecb4dc22 AE |
5191 | *(snap_name + len) = '\0'; |
5192 | spec->snap_name = snap_name; | |
e5c35534 | 5193 | |
0ddebc0c | 5194 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5195 | |
4e9afeba AE |
5196 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
5197 | if (!rbd_opts) | |
5198 | goto out_mem; | |
5199 | ||
5200 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 5201 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
80de1912 | 5202 | rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
e010dd0a | 5203 | rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
d22f76e7 | 5204 | |
859c31df | 5205 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 5206 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 5207 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
5208 | if (IS_ERR(copts)) { |
5209 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5210 | goto out_err; |
5211 | } | |
859c31df AE |
5212 | kfree(options); |
5213 | ||
5214 | *ceph_opts = copts; | |
4e9afeba | 5215 | *opts = rbd_opts; |
859c31df | 5216 | *rbd_spec = spec; |
0ddebc0c | 5217 | |
dc79b113 | 5218 | return 0; |
f28e565a | 5219 | out_mem: |
dc79b113 | 5220 | ret = -ENOMEM; |
d22f76e7 | 5221 | out_err: |
859c31df AE |
5222 | kfree(rbd_opts); |
5223 | rbd_spec_put(spec); | |
f28e565a | 5224 | kfree(options); |
d22f76e7 | 5225 | |
dc79b113 | 5226 | return ret; |
a725f65e AE |
5227 | } |
5228 | ||
30ba1f02 ID |
5229 | /* |
5230 | * Return pool id (>= 0) or a negative error code. | |
5231 | */ | |
5232 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
5233 | { | |
a319bf56 | 5234 | struct ceph_options *opts = rbdc->client->options; |
30ba1f02 | 5235 | u64 newest_epoch; |
30ba1f02 ID |
5236 | int tries = 0; |
5237 | int ret; | |
5238 | ||
5239 | again: | |
5240 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
5241 | if (ret == -ENOENT && tries++ < 1) { | |
d0b19705 ID |
5242 | ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
5243 | &newest_epoch); | |
30ba1f02 ID |
5244 | if (ret < 0) |
5245 | return ret; | |
5246 | ||
5247 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
7cca78c9 | 5248 | ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
30ba1f02 | 5249 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
a319bf56 ID |
5250 | newest_epoch, |
5251 | opts->mount_timeout); | |
30ba1f02 ID |
5252 | goto again; |
5253 | } else { | |
5254 | /* the osdmap we have is new enough */ | |
5255 | return -ENOENT; | |
5256 | } | |
5257 | } | |
5258 | ||
5259 | return ret; | |
5260 | } | |
5261 | ||
e010dd0a ID |
5262 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5263 | { | |
5264 | down_write(&rbd_dev->lock_rwsem); | |
5265 | if (__rbd_is_lock_owner(rbd_dev)) | |
5266 | rbd_unlock(rbd_dev); | |
5267 | up_write(&rbd_dev->lock_rwsem); | |
5268 | } | |
5269 | ||
5270 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5271 | { | |
5272 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { | |
5273 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5274 | return -EINVAL; | |
5275 | } | |
5276 | ||
5277 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5278 | down_read(&rbd_dev->lock_rwsem); | |
5279 | rbd_wait_state_locked(rbd_dev); | |
5280 | up_read(&rbd_dev->lock_rwsem); | |
5281 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { | |
5282 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); | |
5283 | return -EROFS; | |
5284 | } | |
5285 | ||
5286 | return 0; | |
5287 | } | |
5288 | ||
589d30e0 AE |
5289 | /* |
5290 | * An rbd format 2 image has a unique identifier, distinct from the | |
5291 | * name given to it by the user. Internally, that identifier is | |
5292 | * what's used to specify the names of objects related to the image. | |
5293 | * | |
5294 | * A special "rbd id" object is used to map an rbd image name to its | |
5295 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5296 | * with the supplied name. | |
5297 | * | |
5298 | * This function will record the given rbd_dev's image_id field if | |
5299 | * it can be determined, and in that case will return 0. If any | |
5300 | * errors occur a negative errno will be returned and the rbd_dev's | |
5301 | * image_id field will be unchanged (and should be NULL). | |
5302 | */ | |
5303 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5304 | { | |
5305 | int ret; | |
5306 | size_t size; | |
ecd4a68a | 5307 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5308 | void *response; |
c0fba368 | 5309 | char *image_id; |
2f82ee54 | 5310 | |
2c0d0a10 AE |
5311 | /* |
5312 | * When probing a parent image, the image id is already | |
5313 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5314 | * need to fetch the image id again in this case. We |
5315 | * do still need to set the image format though. | |
2c0d0a10 | 5316 | */ |
c0fba368 AE |
5317 | if (rbd_dev->spec->image_id) { |
5318 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5319 | ||
2c0d0a10 | 5320 | return 0; |
c0fba368 | 5321 | } |
2c0d0a10 | 5322 | |
589d30e0 AE |
5323 | /* |
5324 | * First, see if the format 2 image id file exists, and if | |
5325 | * so, get the image's persistent id from it. | |
5326 | */ | |
ecd4a68a ID |
5327 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5328 | rbd_dev->spec->image_name); | |
5329 | if (ret) | |
5330 | return ret; | |
5331 | ||
5332 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5333 | |
5334 | /* Response will be an encoded string, which includes a length */ | |
5335 | ||
5336 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5337 | response = kzalloc(size, GFP_NOIO); | |
5338 | if (!response) { | |
5339 | ret = -ENOMEM; | |
5340 | goto out; | |
5341 | } | |
5342 | ||
c0fba368 AE |
5343 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5344 | ||
ecd4a68a ID |
5345 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5346 | "get_id", NULL, 0, | |
5347 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5348 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5349 | if (ret == -ENOENT) { |
5350 | image_id = kstrdup("", GFP_KERNEL); | |
5351 | ret = image_id ? 0 : -ENOMEM; | |
5352 | if (!ret) | |
5353 | rbd_dev->image_format = 1; | |
7dd440c9 | 5354 | } else if (ret >= 0) { |
c0fba368 AE |
5355 | void *p = response; |
5356 | ||
5357 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5358 | NULL, GFP_NOIO); |
461f758a | 5359 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5360 | if (!ret) |
5361 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5362 | } |
5363 | ||
5364 | if (!ret) { | |
5365 | rbd_dev->spec->image_id = image_id; | |
5366 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5367 | } |
5368 | out: | |
5369 | kfree(response); | |
ecd4a68a | 5370 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5371 | return ret; |
5372 | } | |
5373 | ||
3abef3b3 AE |
5374 | /* |
5375 | * Undo whatever state changes are made by v1 or v2 header info | |
5376 | * call. | |
5377 | */ | |
6fd48b3b AE |
5378 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5379 | { | |
5380 | struct rbd_image_header *header; | |
5381 | ||
e69b8d41 | 5382 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5383 | |
5384 | /* Free dynamic fields from the header, then zero it out */ | |
5385 | ||
5386 | header = &rbd_dev->header; | |
812164f8 | 5387 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5388 | kfree(header->snap_sizes); |
5389 | kfree(header->snap_names); | |
5390 | kfree(header->object_prefix); | |
5391 | memset(header, 0, sizeof (*header)); | |
5392 | } | |
5393 | ||
2df3fac7 | 5394 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5395 | { |
5396 | int ret; | |
a30b71b9 | 5397 | |
1e130199 | 5398 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5399 | if (ret) |
b1b5402a AE |
5400 | goto out_err; |
5401 | ||
2df3fac7 AE |
5402 | /* |
5403 | * Get the and check features for the image. Currently the | |
5404 | * features are assumed to never change. | |
5405 | */ | |
b1b5402a | 5406 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5407 | if (ret) |
9d475de5 | 5408 | goto out_err; |
35d489f9 | 5409 | |
cc070d59 AE |
5410 | /* If the image supports fancy striping, get its parameters */ |
5411 | ||
5412 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5413 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5414 | if (ret < 0) | |
5415 | goto out_err; | |
5416 | } | |
a30b71b9 | 5417 | |
7e97332e ID |
5418 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5419 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5420 | if (ret) | |
5421 | goto out_err; | |
5422 | } | |
5423 | ||
263423f8 | 5424 | rbd_init_layout(rbd_dev); |
35152979 | 5425 | return 0; |
263423f8 | 5426 | |
9d475de5 | 5427 | out_err: |
642a2537 | 5428 | rbd_dev->header.features = 0; |
1e130199 AE |
5429 | kfree(rbd_dev->header.object_prefix); |
5430 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5431 | return ret; |
a30b71b9 AE |
5432 | } |
5433 | ||
6d69bb53 ID |
5434 | /* |
5435 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5436 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5437 | * length of the already discovered part of the parent chain. | |
5438 | */ | |
5439 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5440 | { |
2f82ee54 | 5441 | struct rbd_device *parent = NULL; |
124afba2 AE |
5442 | int ret; |
5443 | ||
5444 | if (!rbd_dev->parent_spec) | |
5445 | return 0; | |
124afba2 | 5446 | |
6d69bb53 ID |
5447 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5448 | pr_info("parent chain is too long (%d)\n", depth); | |
5449 | ret = -EINVAL; | |
5450 | goto out_err; | |
5451 | } | |
5452 | ||
1643dfa4 | 5453 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5454 | if (!parent) { |
5455 | ret = -ENOMEM; | |
124afba2 | 5456 | goto out_err; |
1f2c6651 ID |
5457 | } |
5458 | ||
5459 | /* | |
5460 | * Images related by parent/child relationships always share | |
5461 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5462 | */ | |
5463 | __rbd_get_client(rbd_dev->rbd_client); | |
5464 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5465 | |
6d69bb53 | 5466 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5467 | if (ret < 0) |
5468 | goto out_err; | |
1f2c6651 | 5469 | |
124afba2 | 5470 | rbd_dev->parent = parent; |
a2acd00e | 5471 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5472 | return 0; |
1f2c6651 | 5473 | |
124afba2 | 5474 | out_err: |
1f2c6651 | 5475 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5476 | rbd_dev_destroy(parent); |
124afba2 AE |
5477 | return ret; |
5478 | } | |
5479 | ||
5769ed0c ID |
5480 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5481 | { | |
5482 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5483 | rbd_dev_mapping_clear(rbd_dev); | |
5484 | rbd_free_disk(rbd_dev); | |
5485 | if (!single_major) | |
5486 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5487 | } | |
5488 | ||
811c6688 ID |
5489 | /* |
5490 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5491 | * upon return. | |
5492 | */ | |
200a6a8b | 5493 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5494 | { |
83a06263 | 5495 | int ret; |
d1cf5788 | 5496 | |
9b60e70b | 5497 | /* Record our major and minor device numbers. */ |
83a06263 | 5498 | |
9b60e70b ID |
5499 | if (!single_major) { |
5500 | ret = register_blkdev(0, rbd_dev->name); | |
5501 | if (ret < 0) | |
1643dfa4 | 5502 | goto err_out_unlock; |
9b60e70b ID |
5503 | |
5504 | rbd_dev->major = ret; | |
5505 | rbd_dev->minor = 0; | |
5506 | } else { | |
5507 | rbd_dev->major = rbd_major; | |
5508 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5509 | } | |
83a06263 AE |
5510 | |
5511 | /* Set up the blkdev mapping. */ | |
5512 | ||
5513 | ret = rbd_init_disk(rbd_dev); | |
5514 | if (ret) | |
5515 | goto err_out_blkdev; | |
5516 | ||
f35a4dee | 5517 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5518 | if (ret) |
5519 | goto err_out_disk; | |
bc1ecc65 | 5520 | |
f35a4dee | 5521 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5522 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5523 | |
5769ed0c | 5524 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5525 | if (ret) |
f5ee37bd | 5526 | goto err_out_mapping; |
83a06263 | 5527 | |
129b79d4 | 5528 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5529 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5530 | return 0; |
2f82ee54 | 5531 | |
f35a4dee AE |
5532 | err_out_mapping: |
5533 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5534 | err_out_disk: |
5535 | rbd_free_disk(rbd_dev); | |
5536 | err_out_blkdev: | |
9b60e70b ID |
5537 | if (!single_major) |
5538 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5539 | err_out_unlock: |
5540 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5541 | return ret; |
5542 | } | |
5543 | ||
332bb12d AE |
5544 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5545 | { | |
5546 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5547 | int ret; |
332bb12d AE |
5548 | |
5549 | /* Record the header object name for this rbd image. */ | |
5550 | ||
5551 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5552 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5553 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5554 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5555 | else |
c41d13a3 ID |
5556 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5557 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5558 | |
c41d13a3 | 5559 | return ret; |
332bb12d AE |
5560 | } |
5561 | ||
200a6a8b AE |
5562 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5563 | { | |
6fd48b3b | 5564 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
5565 | if (rbd_dev->opts) |
5566 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
5567 | rbd_dev->image_format = 0; |
5568 | kfree(rbd_dev->spec->image_id); | |
5569 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
5570 | } |
5571 | ||
a30b71b9 AE |
5572 | /* |
5573 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5574 | * device. If this image is the one being mapped (i.e., not a |
5575 | * parent), initiate a watch on its header object before using that | |
5576 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5577 | */ |
6d69bb53 | 5578 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5579 | { |
5580 | int ret; | |
5581 | ||
5582 | /* | |
3abef3b3 AE |
5583 | * Get the id from the image id object. Unless there's an |
5584 | * error, rbd_dev->spec->image_id will be filled in with | |
5585 | * a dynamically-allocated string, and rbd_dev->image_format | |
5586 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5587 | */ |
5588 | ret = rbd_dev_image_id(rbd_dev); | |
5589 | if (ret) | |
c0fba368 | 5590 | return ret; |
c0fba368 | 5591 | |
332bb12d AE |
5592 | ret = rbd_dev_header_name(rbd_dev); |
5593 | if (ret) | |
5594 | goto err_out_format; | |
5595 | ||
6d69bb53 | 5596 | if (!depth) { |
99d16943 | 5597 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5598 | if (ret) { |
5599 | if (ret == -ENOENT) | |
5600 | pr_info("image %s/%s does not exist\n", | |
5601 | rbd_dev->spec->pool_name, | |
5602 | rbd_dev->spec->image_name); | |
c41d13a3 | 5603 | goto err_out_format; |
1fe48023 | 5604 | } |
1f3ef788 | 5605 | } |
b644de2b | 5606 | |
a720ae09 | 5607 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5608 | if (ret) |
b644de2b | 5609 | goto err_out_watch; |
83a06263 | 5610 | |
04077599 ID |
5611 | /* |
5612 | * If this image is the one being mapped, we have pool name and | |
5613 | * id, image name and id, and snap name - need to fill snap id. | |
5614 | * Otherwise this is a parent image, identified by pool, image | |
5615 | * and snap ids - need to fill in names for those ids. | |
5616 | */ | |
6d69bb53 | 5617 | if (!depth) |
04077599 ID |
5618 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5619 | else | |
5620 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5621 | if (ret) { |
5622 | if (ret == -ENOENT) | |
5623 | pr_info("snap %s/%s@%s does not exist\n", | |
5624 | rbd_dev->spec->pool_name, | |
5625 | rbd_dev->spec->image_name, | |
5626 | rbd_dev->spec->snap_name); | |
33dca39f | 5627 | goto err_out_probe; |
1fe48023 | 5628 | } |
9bb81c9b | 5629 | |
e8f59b59 ID |
5630 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5631 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5632 | if (ret) | |
5633 | goto err_out_probe; | |
5634 | ||
5635 | /* | |
5636 | * Need to warn users if this image is the one being | |
5637 | * mapped and has a parent. | |
5638 | */ | |
6d69bb53 | 5639 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
5640 | rbd_warn(rbd_dev, |
5641 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5642 | } | |
5643 | ||
6d69bb53 | 5644 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5645 | if (ret) |
5646 | goto err_out_probe; | |
5647 | ||
5648 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5649 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5650 | return 0; |
e8f59b59 | 5651 | |
6fd48b3b AE |
5652 | err_out_probe: |
5653 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5654 | err_out_watch: |
6d69bb53 | 5655 | if (!depth) |
99d16943 | 5656 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5657 | err_out_format: |
5658 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5659 | kfree(rbd_dev->spec->image_id); |
5660 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5661 | return ret; |
5662 | } | |
5663 | ||
9b60e70b ID |
5664 | static ssize_t do_rbd_add(struct bus_type *bus, |
5665 | const char *buf, | |
5666 | size_t count) | |
602adf40 | 5667 | { |
cb8627c7 | 5668 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5669 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5670 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5671 | struct rbd_spec *spec = NULL; |
9d3997fd | 5672 | struct rbd_client *rbdc; |
b51c83c2 | 5673 | int rc; |
602adf40 YS |
5674 | |
5675 | if (!try_module_get(THIS_MODULE)) | |
5676 | return -ENODEV; | |
5677 | ||
602adf40 | 5678 | /* parse add command */ |
859c31df | 5679 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5680 | if (rc < 0) |
dd5ac32d | 5681 | goto out; |
78cea76e | 5682 | |
9d3997fd AE |
5683 | rbdc = rbd_get_client(ceph_opts); |
5684 | if (IS_ERR(rbdc)) { | |
5685 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5686 | goto err_out_args; |
9d3997fd | 5687 | } |
602adf40 | 5688 | |
602adf40 | 5689 | /* pick the pool */ |
30ba1f02 | 5690 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
1fe48023 ID |
5691 | if (rc < 0) { |
5692 | if (rc == -ENOENT) | |
5693 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5694 | goto err_out_client; |
1fe48023 | 5695 | } |
c0cd10db | 5696 | spec->pool_id = (u64)rc; |
859c31df | 5697 | |
d147543d | 5698 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5699 | if (!rbd_dev) { |
5700 | rc = -ENOMEM; | |
bd4ba655 | 5701 | goto err_out_client; |
b51c83c2 | 5702 | } |
c53d5893 AE |
5703 | rbdc = NULL; /* rbd_dev now owns this */ |
5704 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5705 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5706 | |
0d6d1e9c MC |
5707 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
5708 | if (!rbd_dev->config_info) { | |
5709 | rc = -ENOMEM; | |
5710 | goto err_out_rbd_dev; | |
5711 | } | |
5712 | ||
811c6688 | 5713 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5714 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
5715 | if (rc < 0) { |
5716 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 5717 | goto err_out_rbd_dev; |
0d6d1e9c | 5718 | } |
05fd6f6f | 5719 | |
7ce4eef7 | 5720 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 5721 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 5722 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 5723 | |
b536f69a | 5724 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 5725 | if (rc) |
8b679ec5 | 5726 | goto err_out_image_probe; |
3abef3b3 | 5727 | |
e010dd0a ID |
5728 | if (rbd_dev->opts->exclusive) { |
5729 | rc = rbd_add_acquire_lock(rbd_dev); | |
5730 | if (rc) | |
5731 | goto err_out_device_setup; | |
3abef3b3 AE |
5732 | } |
5733 | ||
5769ed0c ID |
5734 | /* Everything's ready. Announce the disk to the world. */ |
5735 | ||
5736 | rc = device_add(&rbd_dev->dev); | |
5737 | if (rc) | |
e010dd0a | 5738 | goto err_out_image_lock; |
5769ed0c ID |
5739 | |
5740 | add_disk(rbd_dev->disk); | |
5741 | /* see rbd_init_disk() */ | |
5742 | blk_put_queue(rbd_dev->disk->queue); | |
5743 | ||
5744 | spin_lock(&rbd_dev_list_lock); | |
5745 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5746 | spin_unlock(&rbd_dev_list_lock); | |
5747 | ||
5748 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
5749 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
5750 | rbd_dev->header.features); | |
dd5ac32d ID |
5751 | rc = count; |
5752 | out: | |
5753 | module_put(THIS_MODULE); | |
5754 | return rc; | |
b536f69a | 5755 | |
e010dd0a ID |
5756 | err_out_image_lock: |
5757 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
5758 | err_out_device_setup: |
5759 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
5760 | err_out_image_probe: |
5761 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
5762 | err_out_rbd_dev: |
5763 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5764 | err_out_client: |
9d3997fd | 5765 | rbd_put_client(rbdc); |
0ddebc0c | 5766 | err_out_args: |
859c31df | 5767 | rbd_spec_put(spec); |
d147543d | 5768 | kfree(rbd_opts); |
dd5ac32d | 5769 | goto out; |
602adf40 YS |
5770 | } |
5771 | ||
9b60e70b ID |
5772 | static ssize_t rbd_add(struct bus_type *bus, |
5773 | const char *buf, | |
5774 | size_t count) | |
5775 | { | |
5776 | if (single_major) | |
5777 | return -EINVAL; | |
5778 | ||
5779 | return do_rbd_add(bus, buf, count); | |
5780 | } | |
5781 | ||
5782 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5783 | const char *buf, | |
5784 | size_t count) | |
5785 | { | |
5786 | return do_rbd_add(bus, buf, count); | |
5787 | } | |
5788 | ||
05a46afd AE |
5789 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5790 | { | |
ad945fc1 | 5791 | while (rbd_dev->parent) { |
05a46afd AE |
5792 | struct rbd_device *first = rbd_dev; |
5793 | struct rbd_device *second = first->parent; | |
5794 | struct rbd_device *third; | |
5795 | ||
5796 | /* | |
5797 | * Follow to the parent with no grandparent and | |
5798 | * remove it. | |
5799 | */ | |
5800 | while (second && (third = second->parent)) { | |
5801 | first = second; | |
5802 | second = third; | |
5803 | } | |
ad945fc1 | 5804 | rbd_assert(second); |
8ad42cd0 | 5805 | rbd_dev_image_release(second); |
8b679ec5 | 5806 | rbd_dev_destroy(second); |
ad945fc1 AE |
5807 | first->parent = NULL; |
5808 | first->parent_overlap = 0; | |
5809 | ||
5810 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5811 | rbd_spec_put(first->parent_spec); |
5812 | first->parent_spec = NULL; | |
05a46afd AE |
5813 | } |
5814 | } | |
5815 | ||
9b60e70b ID |
5816 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5817 | const char *buf, | |
5818 | size_t count) | |
602adf40 YS |
5819 | { |
5820 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5821 | struct list_head *tmp; |
5822 | int dev_id; | |
0276dca6 | 5823 | char opt_buf[6]; |
82a442d2 | 5824 | bool already = false; |
0276dca6 | 5825 | bool force = false; |
0d8189e1 | 5826 | int ret; |
602adf40 | 5827 | |
0276dca6 MC |
5828 | dev_id = -1; |
5829 | opt_buf[0] = '\0'; | |
5830 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
5831 | if (dev_id < 0) { | |
5832 | pr_err("dev_id out of range\n"); | |
602adf40 | 5833 | return -EINVAL; |
0276dca6 MC |
5834 | } |
5835 | if (opt_buf[0] != '\0') { | |
5836 | if (!strcmp(opt_buf, "force")) { | |
5837 | force = true; | |
5838 | } else { | |
5839 | pr_err("bad remove option at '%s'\n", opt_buf); | |
5840 | return -EINVAL; | |
5841 | } | |
5842 | } | |
602adf40 | 5843 | |
751cc0e3 AE |
5844 | ret = -ENOENT; |
5845 | spin_lock(&rbd_dev_list_lock); | |
5846 | list_for_each(tmp, &rbd_dev_list) { | |
5847 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5848 | if (rbd_dev->dev_id == dev_id) { | |
5849 | ret = 0; | |
5850 | break; | |
5851 | } | |
42382b70 | 5852 | } |
751cc0e3 AE |
5853 | if (!ret) { |
5854 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 5855 | if (rbd_dev->open_count && !force) |
751cc0e3 AE |
5856 | ret = -EBUSY; |
5857 | else | |
82a442d2 AE |
5858 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5859 | &rbd_dev->flags); | |
751cc0e3 AE |
5860 | spin_unlock_irq(&rbd_dev->lock); |
5861 | } | |
5862 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5863 | if (ret < 0 || already) |
1ba0f1e7 | 5864 | return ret; |
751cc0e3 | 5865 | |
0276dca6 MC |
5866 | if (force) { |
5867 | /* | |
5868 | * Prevent new IO from being queued and wait for existing | |
5869 | * IO to complete/fail. | |
5870 | */ | |
5871 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
5872 | blk_set_queue_dying(rbd_dev->disk->queue); | |
5873 | } | |
5874 | ||
5769ed0c ID |
5875 | del_gendisk(rbd_dev->disk); |
5876 | spin_lock(&rbd_dev_list_lock); | |
5877 | list_del_init(&rbd_dev->node); | |
5878 | spin_unlock(&rbd_dev_list_lock); | |
5879 | device_del(&rbd_dev->dev); | |
fca27065 | 5880 | |
e010dd0a | 5881 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 5882 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 5883 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 5884 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 5885 | return count; |
602adf40 YS |
5886 | } |
5887 | ||
9b60e70b ID |
5888 | static ssize_t rbd_remove(struct bus_type *bus, |
5889 | const char *buf, | |
5890 | size_t count) | |
5891 | { | |
5892 | if (single_major) | |
5893 | return -EINVAL; | |
5894 | ||
5895 | return do_rbd_remove(bus, buf, count); | |
5896 | } | |
5897 | ||
5898 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5899 | const char *buf, | |
5900 | size_t count) | |
5901 | { | |
5902 | return do_rbd_remove(bus, buf, count); | |
5903 | } | |
5904 | ||
602adf40 YS |
5905 | /* |
5906 | * create control files in sysfs | |
dfc5606d | 5907 | * /sys/bus/rbd/... |
602adf40 YS |
5908 | */ |
5909 | static int rbd_sysfs_init(void) | |
5910 | { | |
dfc5606d | 5911 | int ret; |
602adf40 | 5912 | |
fed4c143 | 5913 | ret = device_register(&rbd_root_dev); |
21079786 | 5914 | if (ret < 0) |
dfc5606d | 5915 | return ret; |
602adf40 | 5916 | |
fed4c143 AE |
5917 | ret = bus_register(&rbd_bus_type); |
5918 | if (ret < 0) | |
5919 | device_unregister(&rbd_root_dev); | |
602adf40 | 5920 | |
602adf40 YS |
5921 | return ret; |
5922 | } | |
5923 | ||
5924 | static void rbd_sysfs_cleanup(void) | |
5925 | { | |
dfc5606d | 5926 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5927 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5928 | } |
5929 | ||
1c2a9dfe AE |
5930 | static int rbd_slab_init(void) |
5931 | { | |
5932 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 5933 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
5934 | if (!rbd_img_request_cache) |
5935 | return -ENOMEM; | |
5936 | ||
5937 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 5938 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
5939 | if (!rbd_obj_request_cache) |
5940 | goto out_err; | |
5941 | ||
6c696d85 | 5942 | return 0; |
1c2a9dfe | 5943 | |
6c696d85 | 5944 | out_err: |
868311b1 AE |
5945 | kmem_cache_destroy(rbd_img_request_cache); |
5946 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
5947 | return -ENOMEM; |
5948 | } | |
5949 | ||
5950 | static void rbd_slab_exit(void) | |
5951 | { | |
868311b1 AE |
5952 | rbd_assert(rbd_obj_request_cache); |
5953 | kmem_cache_destroy(rbd_obj_request_cache); | |
5954 | rbd_obj_request_cache = NULL; | |
5955 | ||
1c2a9dfe AE |
5956 | rbd_assert(rbd_img_request_cache); |
5957 | kmem_cache_destroy(rbd_img_request_cache); | |
5958 | rbd_img_request_cache = NULL; | |
5959 | } | |
5960 | ||
cc344fa1 | 5961 | static int __init rbd_init(void) |
602adf40 YS |
5962 | { |
5963 | int rc; | |
5964 | ||
1e32d34c AE |
5965 | if (!libceph_compatible(NULL)) { |
5966 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5967 | return -EINVAL; |
5968 | } | |
e1b4d96d | 5969 | |
1c2a9dfe | 5970 | rc = rbd_slab_init(); |
602adf40 YS |
5971 | if (rc) |
5972 | return rc; | |
e1b4d96d | 5973 | |
f5ee37bd ID |
5974 | /* |
5975 | * The number of active work items is limited by the number of | |
f77303bd | 5976 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
5977 | */ |
5978 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
5979 | if (!rbd_wq) { | |
5980 | rc = -ENOMEM; | |
5981 | goto err_out_slab; | |
5982 | } | |
5983 | ||
9b60e70b ID |
5984 | if (single_major) { |
5985 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5986 | if (rbd_major < 0) { | |
5987 | rc = rbd_major; | |
f5ee37bd | 5988 | goto err_out_wq; |
9b60e70b ID |
5989 | } |
5990 | } | |
5991 | ||
1c2a9dfe AE |
5992 | rc = rbd_sysfs_init(); |
5993 | if (rc) | |
9b60e70b ID |
5994 | goto err_out_blkdev; |
5995 | ||
5996 | if (single_major) | |
5997 | pr_info("loaded (major %d)\n", rbd_major); | |
5998 | else | |
5999 | pr_info("loaded\n"); | |
1c2a9dfe | 6000 | |
e1b4d96d ID |
6001 | return 0; |
6002 | ||
9b60e70b ID |
6003 | err_out_blkdev: |
6004 | if (single_major) | |
6005 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
6006 | err_out_wq: |
6007 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
6008 | err_out_slab: |
6009 | rbd_slab_exit(); | |
1c2a9dfe | 6010 | return rc; |
602adf40 YS |
6011 | } |
6012 | ||
cc344fa1 | 6013 | static void __exit rbd_exit(void) |
602adf40 | 6014 | { |
ffe312cf | 6015 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6016 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6017 | if (single_major) |
6018 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6019 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6020 | rbd_slab_exit(); |
602adf40 YS |
6021 | } |
6022 | ||
6023 | module_init(rbd_init); | |
6024 | module_exit(rbd_exit); | |
6025 | ||
d552c619 | 6026 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6027 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6028 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6029 | /* following authorship retained from original osdblk.c */ |
6030 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6031 | ||
90da258b | 6032 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6033 | MODULE_LICENSE("GPL"); |