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 AE |
219 | enum obj_request_type { |
220 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
221 | }; | |
bf0d5f50 | 222 | |
6d2940c8 GZ |
223 | enum obj_operation_type { |
224 | OBJ_OP_WRITE, | |
225 | OBJ_OP_READ, | |
90e98c52 | 226 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
227 | }; |
228 | ||
926f9b3f AE |
229 | enum obj_req_flags { |
230 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 231 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
232 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
233 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
234 | }; |
235 | ||
bf0d5f50 | 236 | struct rbd_obj_request { |
a90bb0c1 | 237 | u64 object_no; |
bf0d5f50 AE |
238 | u64 offset; /* object start byte */ |
239 | u64 length; /* bytes from offset */ | |
926f9b3f | 240 | unsigned long flags; |
bf0d5f50 | 241 | |
c5b5ef6c AE |
242 | /* |
243 | * An object request associated with an image will have its | |
244 | * img_data flag set; a standalone object request will not. | |
245 | * | |
246 | * A standalone object request will have which == BAD_WHICH | |
247 | * and a null obj_request pointer. | |
248 | * | |
249 | * An object request initiated in support of a layered image | |
250 | * object (to check for its existence before a write) will | |
251 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
252 | * | |
253 | * Finally, an object request for rbd image data will have | |
254 | * which != BAD_WHICH, and will have a non-null img_request | |
255 | * pointer. The value of which will be in the range | |
256 | * 0..(img_request->obj_request_count-1). | |
257 | */ | |
258 | union { | |
259 | struct rbd_obj_request *obj_request; /* STAT op */ | |
260 | struct { | |
261 | struct rbd_img_request *img_request; | |
262 | u64 img_offset; | |
263 | /* links for img_request->obj_requests list */ | |
264 | struct list_head links; | |
265 | }; | |
266 | }; | |
bf0d5f50 AE |
267 | u32 which; /* posn image request list */ |
268 | ||
269 | enum obj_request_type type; | |
788e2df3 AE |
270 | union { |
271 | struct bio *bio_list; | |
272 | struct { | |
273 | struct page **pages; | |
274 | u32 page_count; | |
275 | }; | |
276 | }; | |
0eefd470 | 277 | struct page **copyup_pages; |
ebda6408 | 278 | u32 copyup_page_count; |
bf0d5f50 AE |
279 | |
280 | struct ceph_osd_request *osd_req; | |
281 | ||
282 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 283 | int result; |
bf0d5f50 AE |
284 | |
285 | rbd_obj_callback_t callback; | |
286 | ||
287 | struct kref kref; | |
288 | }; | |
289 | ||
0c425248 | 290 | enum img_req_flags { |
9849e986 AE |
291 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
292 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 293 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
90e98c52 | 294 | IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
0c425248 AE |
295 | }; |
296 | ||
bf0d5f50 | 297 | struct rbd_img_request { |
bf0d5f50 AE |
298 | struct rbd_device *rbd_dev; |
299 | u64 offset; /* starting image byte offset */ | |
300 | u64 length; /* byte count from offset */ | |
0c425248 | 301 | unsigned long flags; |
bf0d5f50 | 302 | union { |
9849e986 | 303 | u64 snap_id; /* for reads */ |
bf0d5f50 | 304 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
305 | }; |
306 | union { | |
307 | struct request *rq; /* block request */ | |
308 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 309 | }; |
3d7efd18 | 310 | struct page **copyup_pages; |
ebda6408 | 311 | u32 copyup_page_count; |
bf0d5f50 AE |
312 | spinlock_t completion_lock;/* protects next_completion */ |
313 | u32 next_completion; | |
314 | rbd_img_callback_t callback; | |
55f27e09 | 315 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 316 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
317 | |
318 | u32 obj_request_count; | |
319 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
320 | ||
321 | struct kref kref; | |
322 | }; | |
323 | ||
324 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 325 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 326 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 327 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 328 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 329 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 330 | |
99d16943 ID |
331 | enum rbd_watch_state { |
332 | RBD_WATCH_STATE_UNREGISTERED, | |
333 | RBD_WATCH_STATE_REGISTERED, | |
334 | RBD_WATCH_STATE_ERROR, | |
335 | }; | |
336 | ||
ed95b21a ID |
337 | enum rbd_lock_state { |
338 | RBD_LOCK_STATE_UNLOCKED, | |
339 | RBD_LOCK_STATE_LOCKED, | |
340 | RBD_LOCK_STATE_RELEASING, | |
341 | }; | |
342 | ||
343 | /* WatchNotify::ClientId */ | |
344 | struct rbd_client_id { | |
345 | u64 gid; | |
346 | u64 handle; | |
347 | }; | |
348 | ||
f84344f3 | 349 | struct rbd_mapping { |
99c1f08f | 350 | u64 size; |
34b13184 | 351 | u64 features; |
f84344f3 AE |
352 | }; |
353 | ||
602adf40 YS |
354 | /* |
355 | * a single device | |
356 | */ | |
357 | struct rbd_device { | |
de71a297 | 358 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
359 | |
360 | int major; /* blkdev assigned major */ | |
dd82fff1 | 361 | int minor; |
602adf40 | 362 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 363 | |
a30b71b9 | 364 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
365 | struct rbd_client *rbd_client; |
366 | ||
367 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
368 | ||
b82d167b | 369 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
370 | |
371 | struct rbd_image_header header; | |
b82d167b | 372 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 373 | struct rbd_spec *spec; |
d147543d | 374 | struct rbd_options *opts; |
0d6d1e9c | 375 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 376 | |
c41d13a3 | 377 | struct ceph_object_id header_oid; |
922dab61 | 378 | struct ceph_object_locator header_oloc; |
971f839a | 379 | |
1643dfa4 | 380 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 381 | |
99d16943 ID |
382 | struct mutex watch_mutex; |
383 | enum rbd_watch_state watch_state; | |
922dab61 | 384 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
385 | u64 watch_cookie; |
386 | struct delayed_work watch_dwork; | |
59c2be1e | 387 | |
ed95b21a ID |
388 | struct rw_semaphore lock_rwsem; |
389 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 390 | char lock_cookie[32]; |
ed95b21a ID |
391 | struct rbd_client_id owner_cid; |
392 | struct work_struct acquired_lock_work; | |
393 | struct work_struct released_lock_work; | |
394 | struct delayed_work lock_dwork; | |
395 | struct work_struct unlock_work; | |
396 | wait_queue_head_t lock_waitq; | |
397 | ||
1643dfa4 | 398 | struct workqueue_struct *task_wq; |
59c2be1e | 399 | |
86b00e0d AE |
400 | struct rbd_spec *parent_spec; |
401 | u64 parent_overlap; | |
a2acd00e | 402 | atomic_t parent_ref; |
2f82ee54 | 403 | struct rbd_device *parent; |
86b00e0d | 404 | |
7ad18afa CH |
405 | /* Block layer tags. */ |
406 | struct blk_mq_tag_set tag_set; | |
407 | ||
c666601a JD |
408 | /* protects updating the header */ |
409 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
410 | |
411 | struct rbd_mapping mapping; | |
602adf40 YS |
412 | |
413 | struct list_head node; | |
dfc5606d | 414 | |
dfc5606d YS |
415 | /* sysfs related */ |
416 | struct device dev; | |
b82d167b | 417 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
418 | }; |
419 | ||
b82d167b | 420 | /* |
87c0fded ID |
421 | * Flag bits for rbd_dev->flags: |
422 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
423 | * by rbd_dev->lock | |
424 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 425 | */ |
6d292906 AE |
426 | enum rbd_dev_flags { |
427 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 428 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 429 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
430 | }; |
431 | ||
cfbf6377 | 432 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 433 | |
602adf40 | 434 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
435 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
436 | ||
432b8587 AE |
437 | static LIST_HEAD(rbd_client_list); /* clients */ |
438 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 439 | |
78c2a44a AE |
440 | /* Slab caches for frequently-allocated structures */ |
441 | ||
1c2a9dfe | 442 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 443 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 444 | |
f856dc36 N |
445 | static struct bio_set *rbd_bio_clone; |
446 | ||
9b60e70b | 447 | static int rbd_major; |
f8a22fc2 ID |
448 | static DEFINE_IDA(rbd_dev_id_ida); |
449 | ||
f5ee37bd ID |
450 | static struct workqueue_struct *rbd_wq; |
451 | ||
9b60e70b | 452 | /* |
3cfa3b16 | 453 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 454 | */ |
3cfa3b16 | 455 | static bool single_major = true; |
9b60e70b | 456 | module_param(single_major, bool, S_IRUGO); |
3cfa3b16 | 457 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 458 | |
3d7efd18 AE |
459 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
460 | ||
f0f8cef5 AE |
461 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
462 | size_t count); | |
463 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
464 | size_t count); | |
9b60e70b ID |
465 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
466 | size_t count); | |
467 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
468 | size_t count); | |
6d69bb53 | 469 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
a2acd00e | 470 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 471 | |
9b60e70b ID |
472 | static int rbd_dev_id_to_minor(int dev_id) |
473 | { | |
7e513d43 | 474 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
475 | } |
476 | ||
477 | static int minor_to_rbd_dev_id(int minor) | |
478 | { | |
7e513d43 | 479 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
480 | } |
481 | ||
ed95b21a ID |
482 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
483 | { | |
484 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
485 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
486 | } | |
487 | ||
488 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
489 | { | |
490 | bool is_lock_owner; | |
491 | ||
492 | down_read(&rbd_dev->lock_rwsem); | |
493 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
494 | up_read(&rbd_dev->lock_rwsem); | |
495 | return is_lock_owner; | |
496 | } | |
497 | ||
8767b293 ID |
498 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
499 | { | |
500 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
501 | } | |
502 | ||
b15a21dd GKH |
503 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
504 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
505 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
506 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
8767b293 | 507 | static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL); |
b15a21dd GKH |
508 | |
509 | static struct attribute *rbd_bus_attrs[] = { | |
510 | &bus_attr_add.attr, | |
511 | &bus_attr_remove.attr, | |
9b60e70b ID |
512 | &bus_attr_add_single_major.attr, |
513 | &bus_attr_remove_single_major.attr, | |
8767b293 | 514 | &bus_attr_supported_features.attr, |
b15a21dd | 515 | NULL, |
f0f8cef5 | 516 | }; |
92c76dc0 ID |
517 | |
518 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
519 | struct attribute *attr, int index) | |
520 | { | |
9b60e70b ID |
521 | if (!single_major && |
522 | (attr == &bus_attr_add_single_major.attr || | |
523 | attr == &bus_attr_remove_single_major.attr)) | |
524 | return 0; | |
525 | ||
92c76dc0 ID |
526 | return attr->mode; |
527 | } | |
528 | ||
529 | static const struct attribute_group rbd_bus_group = { | |
530 | .attrs = rbd_bus_attrs, | |
531 | .is_visible = rbd_bus_is_visible, | |
532 | }; | |
533 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
534 | |
535 | static struct bus_type rbd_bus_type = { | |
536 | .name = "rbd", | |
b15a21dd | 537 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
538 | }; |
539 | ||
540 | static void rbd_root_dev_release(struct device *dev) | |
541 | { | |
542 | } | |
543 | ||
544 | static struct device rbd_root_dev = { | |
545 | .init_name = "rbd", | |
546 | .release = rbd_root_dev_release, | |
547 | }; | |
548 | ||
06ecc6cb AE |
549 | static __printf(2, 3) |
550 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
551 | { | |
552 | struct va_format vaf; | |
553 | va_list args; | |
554 | ||
555 | va_start(args, fmt); | |
556 | vaf.fmt = fmt; | |
557 | vaf.va = &args; | |
558 | ||
559 | if (!rbd_dev) | |
560 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
561 | else if (rbd_dev->disk) | |
562 | printk(KERN_WARNING "%s: %s: %pV\n", | |
563 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
564 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
565 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
566 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
567 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
568 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
569 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
570 | else /* punt */ | |
571 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
572 | RBD_DRV_NAME, rbd_dev, &vaf); | |
573 | va_end(args); | |
574 | } | |
575 | ||
aafb230e AE |
576 | #ifdef RBD_DEBUG |
577 | #define rbd_assert(expr) \ | |
578 | if (unlikely(!(expr))) { \ | |
579 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
580 | "at line %d:\n\n" \ | |
581 | "\trbd_assert(%s);\n\n", \ | |
582 | __func__, __LINE__, #expr); \ | |
583 | BUG(); \ | |
584 | } | |
585 | #else /* !RBD_DEBUG */ | |
586 | # define rbd_assert(expr) ((void) 0) | |
587 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 588 | |
2761713d | 589 | static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); |
b454e36d | 590 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
591 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
592 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 593 | |
cc4a38bd | 594 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 595 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 596 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 597 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
598 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
599 | u64 snap_id); | |
2ad3d716 AE |
600 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
601 | u8 *order, u64 *snap_size); | |
602 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
603 | u64 *snap_features); | |
59c2be1e | 604 | |
602adf40 YS |
605 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
606 | { | |
f0f8cef5 | 607 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 608 | bool removing = false; |
602adf40 | 609 | |
a14ea269 | 610 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
611 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
612 | removing = true; | |
613 | else | |
614 | rbd_dev->open_count++; | |
a14ea269 | 615 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
616 | if (removing) |
617 | return -ENOENT; | |
618 | ||
c3e946ce | 619 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 620 | |
602adf40 YS |
621 | return 0; |
622 | } | |
623 | ||
db2a144b | 624 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
625 | { |
626 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
627 | unsigned long open_count_before; |
628 | ||
a14ea269 | 629 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 630 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 631 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 632 | rbd_assert(open_count_before > 0); |
dfc5606d | 633 | |
c3e946ce | 634 | put_device(&rbd_dev->dev); |
dfc5606d YS |
635 | } |
636 | ||
131fd9f6 GZ |
637 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
638 | { | |
1de797bb | 639 | int ro; |
131fd9f6 | 640 | |
1de797bb | 641 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
642 | return -EFAULT; |
643 | ||
1de797bb | 644 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
645 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
646 | return -EROFS; | |
647 | ||
1de797bb ID |
648 | /* Let blkdev_roset() handle it */ |
649 | return -ENOTTY; | |
131fd9f6 GZ |
650 | } |
651 | ||
652 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
653 | unsigned int cmd, unsigned long arg) | |
654 | { | |
655 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 656 | int ret; |
131fd9f6 | 657 | |
131fd9f6 GZ |
658 | switch (cmd) { |
659 | case BLKROSET: | |
660 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
661 | break; | |
662 | default: | |
663 | ret = -ENOTTY; | |
664 | } | |
665 | ||
131fd9f6 GZ |
666 | return ret; |
667 | } | |
668 | ||
669 | #ifdef CONFIG_COMPAT | |
670 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
671 | unsigned int cmd, unsigned long arg) | |
672 | { | |
673 | return rbd_ioctl(bdev, mode, cmd, arg); | |
674 | } | |
675 | #endif /* CONFIG_COMPAT */ | |
676 | ||
602adf40 YS |
677 | static const struct block_device_operations rbd_bd_ops = { |
678 | .owner = THIS_MODULE, | |
679 | .open = rbd_open, | |
dfc5606d | 680 | .release = rbd_release, |
131fd9f6 GZ |
681 | .ioctl = rbd_ioctl, |
682 | #ifdef CONFIG_COMPAT | |
683 | .compat_ioctl = rbd_compat_ioctl, | |
684 | #endif | |
602adf40 YS |
685 | }; |
686 | ||
687 | /* | |
7262cfca | 688 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 689 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 690 | */ |
f8c38929 | 691 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
692 | { |
693 | struct rbd_client *rbdc; | |
694 | int ret = -ENOMEM; | |
695 | ||
37206ee5 | 696 | dout("%s:\n", __func__); |
602adf40 YS |
697 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
698 | if (!rbdc) | |
699 | goto out_opt; | |
700 | ||
701 | kref_init(&rbdc->kref); | |
702 | INIT_LIST_HEAD(&rbdc->node); | |
703 | ||
74da4a0f | 704 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 705 | if (IS_ERR(rbdc->client)) |
08f75463 | 706 | goto out_rbdc; |
43ae4701 | 707 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
708 | |
709 | ret = ceph_open_session(rbdc->client); | |
710 | if (ret < 0) | |
08f75463 | 711 | goto out_client; |
602adf40 | 712 | |
432b8587 | 713 | spin_lock(&rbd_client_list_lock); |
602adf40 | 714 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 715 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 716 | |
37206ee5 | 717 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 718 | |
602adf40 | 719 | return rbdc; |
08f75463 | 720 | out_client: |
602adf40 | 721 | ceph_destroy_client(rbdc->client); |
08f75463 | 722 | out_rbdc: |
602adf40 YS |
723 | kfree(rbdc); |
724 | out_opt: | |
43ae4701 AE |
725 | if (ceph_opts) |
726 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
727 | dout("%s: error %d\n", __func__, ret); |
728 | ||
28f259b7 | 729 | return ERR_PTR(ret); |
602adf40 YS |
730 | } |
731 | ||
2f82ee54 AE |
732 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
733 | { | |
734 | kref_get(&rbdc->kref); | |
735 | ||
736 | return rbdc; | |
737 | } | |
738 | ||
602adf40 | 739 | /* |
1f7ba331 AE |
740 | * Find a ceph client with specific addr and configuration. If |
741 | * found, bump its reference count. | |
602adf40 | 742 | */ |
1f7ba331 | 743 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
744 | { |
745 | struct rbd_client *client_node; | |
1f7ba331 | 746 | bool found = false; |
602adf40 | 747 | |
43ae4701 | 748 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
749 | return NULL; |
750 | ||
1f7ba331 AE |
751 | spin_lock(&rbd_client_list_lock); |
752 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
753 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
754 | __rbd_get_client(client_node); |
755 | ||
1f7ba331 AE |
756 | found = true; |
757 | break; | |
758 | } | |
759 | } | |
760 | spin_unlock(&rbd_client_list_lock); | |
761 | ||
762 | return found ? client_node : NULL; | |
602adf40 YS |
763 | } |
764 | ||
59c2be1e | 765 | /* |
210c104c | 766 | * (Per device) rbd map options |
59c2be1e YS |
767 | */ |
768 | enum { | |
b5584180 | 769 | Opt_queue_depth, |
59c2be1e YS |
770 | Opt_last_int, |
771 | /* int args above */ | |
772 | Opt_last_string, | |
773 | /* string args above */ | |
cc0538b6 AE |
774 | Opt_read_only, |
775 | Opt_read_write, | |
80de1912 | 776 | Opt_lock_on_read, |
e010dd0a | 777 | Opt_exclusive, |
210c104c | 778 | Opt_err |
59c2be1e YS |
779 | }; |
780 | ||
43ae4701 | 781 | static match_table_t rbd_opts_tokens = { |
b5584180 | 782 | {Opt_queue_depth, "queue_depth=%d"}, |
59c2be1e YS |
783 | /* int args above */ |
784 | /* string args above */ | |
be466c1c | 785 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
786 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
787 | {Opt_read_write, "read_write"}, | |
788 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 789 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 790 | {Opt_exclusive, "exclusive"}, |
210c104c | 791 | {Opt_err, NULL} |
59c2be1e YS |
792 | }; |
793 | ||
98571b5a | 794 | struct rbd_options { |
b5584180 | 795 | int queue_depth; |
98571b5a | 796 | bool read_only; |
80de1912 | 797 | bool lock_on_read; |
e010dd0a | 798 | bool exclusive; |
98571b5a AE |
799 | }; |
800 | ||
b5584180 | 801 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
98571b5a | 802 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 803 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 804 | #define RBD_EXCLUSIVE_DEFAULT false |
98571b5a | 805 | |
59c2be1e YS |
806 | static int parse_rbd_opts_token(char *c, void *private) |
807 | { | |
43ae4701 | 808 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
809 | substring_t argstr[MAX_OPT_ARGS]; |
810 | int token, intval, ret; | |
811 | ||
43ae4701 | 812 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
813 | if (token < Opt_last_int) { |
814 | ret = match_int(&argstr[0], &intval); | |
815 | if (ret < 0) { | |
210c104c | 816 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
817 | return ret; |
818 | } | |
819 | dout("got int token %d val %d\n", token, intval); | |
820 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 821 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
822 | } else { |
823 | dout("got token %d\n", token); | |
824 | } | |
825 | ||
826 | switch (token) { | |
b5584180 ID |
827 | case Opt_queue_depth: |
828 | if (intval < 1) { | |
829 | pr_err("queue_depth out of range\n"); | |
830 | return -EINVAL; | |
831 | } | |
832 | rbd_opts->queue_depth = intval; | |
833 | break; | |
cc0538b6 AE |
834 | case Opt_read_only: |
835 | rbd_opts->read_only = true; | |
836 | break; | |
837 | case Opt_read_write: | |
838 | rbd_opts->read_only = false; | |
839 | break; | |
80de1912 ID |
840 | case Opt_lock_on_read: |
841 | rbd_opts->lock_on_read = true; | |
842 | break; | |
e010dd0a ID |
843 | case Opt_exclusive: |
844 | rbd_opts->exclusive = true; | |
845 | break; | |
59c2be1e | 846 | default: |
210c104c ID |
847 | /* libceph prints "bad option" msg */ |
848 | return -EINVAL; | |
59c2be1e | 849 | } |
210c104c | 850 | |
59c2be1e YS |
851 | return 0; |
852 | } | |
853 | ||
6d2940c8 GZ |
854 | static char* obj_op_name(enum obj_operation_type op_type) |
855 | { | |
856 | switch (op_type) { | |
857 | case OBJ_OP_READ: | |
858 | return "read"; | |
859 | case OBJ_OP_WRITE: | |
860 | return "write"; | |
90e98c52 GZ |
861 | case OBJ_OP_DISCARD: |
862 | return "discard"; | |
6d2940c8 GZ |
863 | default: |
864 | return "???"; | |
865 | } | |
866 | } | |
867 | ||
602adf40 YS |
868 | /* |
869 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
870 | * not exist create it. Either way, ceph_opts is consumed by this |
871 | * function. | |
602adf40 | 872 | */ |
9d3997fd | 873 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 874 | { |
f8c38929 | 875 | struct rbd_client *rbdc; |
59c2be1e | 876 | |
cfbf6377 | 877 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 878 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 879 | if (rbdc) /* using an existing client */ |
43ae4701 | 880 | ceph_destroy_options(ceph_opts); |
9d3997fd | 881 | else |
f8c38929 | 882 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 883 | mutex_unlock(&client_mutex); |
602adf40 | 884 | |
9d3997fd | 885 | return rbdc; |
602adf40 YS |
886 | } |
887 | ||
888 | /* | |
889 | * Destroy ceph client | |
d23a4b3f | 890 | * |
432b8587 | 891 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
892 | */ |
893 | static void rbd_client_release(struct kref *kref) | |
894 | { | |
895 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
896 | ||
37206ee5 | 897 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 898 | spin_lock(&rbd_client_list_lock); |
602adf40 | 899 | list_del(&rbdc->node); |
cd9d9f5d | 900 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
901 | |
902 | ceph_destroy_client(rbdc->client); | |
903 | kfree(rbdc); | |
904 | } | |
905 | ||
906 | /* | |
907 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
908 | * it. | |
909 | */ | |
9d3997fd | 910 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 911 | { |
c53d5893 AE |
912 | if (rbdc) |
913 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
914 | } |
915 | ||
a30b71b9 AE |
916 | static bool rbd_image_format_valid(u32 image_format) |
917 | { | |
918 | return image_format == 1 || image_format == 2; | |
919 | } | |
920 | ||
8e94af8e AE |
921 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
922 | { | |
103a150f AE |
923 | size_t size; |
924 | u32 snap_count; | |
925 | ||
926 | /* The header has to start with the magic rbd header text */ | |
927 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
928 | return false; | |
929 | ||
db2388b6 AE |
930 | /* The bio layer requires at least sector-sized I/O */ |
931 | ||
932 | if (ondisk->options.order < SECTOR_SHIFT) | |
933 | return false; | |
934 | ||
935 | /* If we use u64 in a few spots we may be able to loosen this */ | |
936 | ||
937 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
938 | return false; | |
939 | ||
103a150f AE |
940 | /* |
941 | * The size of a snapshot header has to fit in a size_t, and | |
942 | * that limits the number of snapshots. | |
943 | */ | |
944 | snap_count = le32_to_cpu(ondisk->snap_count); | |
945 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
946 | if (snap_count > size / sizeof (__le64)) | |
947 | return false; | |
948 | ||
949 | /* | |
950 | * Not only that, but the size of the entire the snapshot | |
951 | * header must also be representable in a size_t. | |
952 | */ | |
953 | size -= snap_count * sizeof (__le64); | |
954 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
955 | return false; | |
956 | ||
957 | return true; | |
8e94af8e AE |
958 | } |
959 | ||
5bc3fb17 ID |
960 | /* |
961 | * returns the size of an object in the image | |
962 | */ | |
963 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
964 | { | |
965 | return 1U << header->obj_order; | |
966 | } | |
967 | ||
263423f8 ID |
968 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
969 | { | |
970 | if (rbd_dev->header.stripe_unit == 0 || | |
971 | rbd_dev->header.stripe_count == 0) { | |
972 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
973 | rbd_dev->header.stripe_count = 1; | |
974 | } | |
975 | ||
976 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
977 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
978 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
979 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
980 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
981 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
982 | } | |
983 | ||
602adf40 | 984 | /* |
bb23e37a AE |
985 | * Fill an rbd image header with information from the given format 1 |
986 | * on-disk header. | |
602adf40 | 987 | */ |
662518b1 | 988 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 989 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 990 | { |
662518b1 | 991 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
992 | bool first_time = header->object_prefix == NULL; |
993 | struct ceph_snap_context *snapc; | |
994 | char *object_prefix = NULL; | |
995 | char *snap_names = NULL; | |
996 | u64 *snap_sizes = NULL; | |
ccece235 | 997 | u32 snap_count; |
bb23e37a | 998 | int ret = -ENOMEM; |
621901d6 | 999 | u32 i; |
602adf40 | 1000 | |
bb23e37a | 1001 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1002 | |
bb23e37a | 1003 | if (first_time) { |
848d796c ID |
1004 | object_prefix = kstrndup(ondisk->object_prefix, |
1005 | sizeof(ondisk->object_prefix), | |
1006 | GFP_KERNEL); | |
bb23e37a AE |
1007 | if (!object_prefix) |
1008 | return -ENOMEM; | |
bb23e37a | 1009 | } |
00f1f36f | 1010 | |
bb23e37a | 1011 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1012 | |
bb23e37a AE |
1013 | snap_count = le32_to_cpu(ondisk->snap_count); |
1014 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1015 | if (!snapc) | |
1016 | goto out_err; | |
1017 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1018 | if (snap_count) { |
bb23e37a | 1019 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1020 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1021 | ||
bb23e37a | 1022 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1023 | |
bb23e37a AE |
1024 | if (snap_names_len > (u64)SIZE_MAX) |
1025 | goto out_2big; | |
1026 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1027 | if (!snap_names) | |
6a52325f AE |
1028 | goto out_err; |
1029 | ||
bb23e37a | 1030 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1031 | snap_sizes = kmalloc_array(snap_count, |
1032 | sizeof(*header->snap_sizes), | |
1033 | GFP_KERNEL); | |
bb23e37a | 1034 | if (!snap_sizes) |
6a52325f | 1035 | goto out_err; |
bb23e37a | 1036 | |
f785cc1d | 1037 | /* |
bb23e37a AE |
1038 | * Copy the names, and fill in each snapshot's id |
1039 | * and size. | |
1040 | * | |
99a41ebc | 1041 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1042 | * ondisk buffer we're working with has |
f785cc1d AE |
1043 | * snap_names_len bytes beyond the end of the |
1044 | * snapshot id array, this memcpy() is safe. | |
1045 | */ | |
bb23e37a AE |
1046 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1047 | snaps = ondisk->snaps; | |
1048 | for (i = 0; i < snap_count; i++) { | |
1049 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1050 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1051 | } | |
602adf40 | 1052 | } |
6a52325f | 1053 | |
bb23e37a | 1054 | /* We won't fail any more, fill in the header */ |
621901d6 | 1055 | |
bb23e37a AE |
1056 | if (first_time) { |
1057 | header->object_prefix = object_prefix; | |
1058 | header->obj_order = ondisk->options.order; | |
263423f8 | 1059 | rbd_init_layout(rbd_dev); |
602adf40 | 1060 | } else { |
662518b1 AE |
1061 | ceph_put_snap_context(header->snapc); |
1062 | kfree(header->snap_names); | |
1063 | kfree(header->snap_sizes); | |
602adf40 | 1064 | } |
849b4260 | 1065 | |
bb23e37a | 1066 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1067 | |
f84344f3 | 1068 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1069 | header->snapc = snapc; |
1070 | header->snap_names = snap_names; | |
1071 | header->snap_sizes = snap_sizes; | |
468521c1 | 1072 | |
602adf40 | 1073 | return 0; |
bb23e37a AE |
1074 | out_2big: |
1075 | ret = -EIO; | |
6a52325f | 1076 | out_err: |
bb23e37a AE |
1077 | kfree(snap_sizes); |
1078 | kfree(snap_names); | |
1079 | ceph_put_snap_context(snapc); | |
1080 | kfree(object_prefix); | |
ccece235 | 1081 | |
bb23e37a | 1082 | return ret; |
602adf40 YS |
1083 | } |
1084 | ||
9682fc6d AE |
1085 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1086 | { | |
1087 | const char *snap_name; | |
1088 | ||
1089 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1090 | ||
1091 | /* Skip over names until we find the one we are looking for */ | |
1092 | ||
1093 | snap_name = rbd_dev->header.snap_names; | |
1094 | while (which--) | |
1095 | snap_name += strlen(snap_name) + 1; | |
1096 | ||
1097 | return kstrdup(snap_name, GFP_KERNEL); | |
1098 | } | |
1099 | ||
30d1cff8 AE |
1100 | /* |
1101 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1102 | * Note that result is for snapshots in *descending* order. | |
1103 | */ | |
1104 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1105 | { | |
1106 | u64 snap_id1 = *(u64 *)s1; | |
1107 | u64 snap_id2 = *(u64 *)s2; | |
1108 | ||
1109 | if (snap_id1 < snap_id2) | |
1110 | return 1; | |
1111 | return snap_id1 == snap_id2 ? 0 : -1; | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Search a snapshot context to see if the given snapshot id is | |
1116 | * present. | |
1117 | * | |
1118 | * Returns the position of the snapshot id in the array if it's found, | |
1119 | * or BAD_SNAP_INDEX otherwise. | |
1120 | * | |
1121 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1122 | * reverse order, highest snapshot id first. | |
1123 | */ | |
9682fc6d AE |
1124 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1125 | { | |
1126 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1127 | u64 *found; |
9682fc6d | 1128 | |
30d1cff8 AE |
1129 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1130 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1131 | |
30d1cff8 | 1132 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1133 | } |
1134 | ||
2ad3d716 AE |
1135 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1136 | u64 snap_id) | |
9e15b77d | 1137 | { |
54cac61f | 1138 | u32 which; |
da6a6b63 | 1139 | const char *snap_name; |
9e15b77d | 1140 | |
54cac61f AE |
1141 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1142 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1143 | return ERR_PTR(-ENOENT); |
54cac61f | 1144 | |
da6a6b63 JD |
1145 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1146 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1147 | } |
1148 | ||
1149 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1150 | { | |
9e15b77d AE |
1151 | if (snap_id == CEPH_NOSNAP) |
1152 | return RBD_SNAP_HEAD_NAME; | |
1153 | ||
54cac61f AE |
1154 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1155 | if (rbd_dev->image_format == 1) | |
1156 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1157 | |
54cac61f | 1158 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1159 | } |
1160 | ||
2ad3d716 AE |
1161 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1162 | u64 *snap_size) | |
602adf40 | 1163 | { |
2ad3d716 AE |
1164 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1165 | if (snap_id == CEPH_NOSNAP) { | |
1166 | *snap_size = rbd_dev->header.image_size; | |
1167 | } else if (rbd_dev->image_format == 1) { | |
1168 | u32 which; | |
602adf40 | 1169 | |
2ad3d716 AE |
1170 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1171 | if (which == BAD_SNAP_INDEX) | |
1172 | return -ENOENT; | |
e86924a8 | 1173 | |
2ad3d716 AE |
1174 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1175 | } else { | |
1176 | u64 size = 0; | |
1177 | int ret; | |
1178 | ||
1179 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1180 | if (ret) | |
1181 | return ret; | |
1182 | ||
1183 | *snap_size = size; | |
1184 | } | |
1185 | return 0; | |
602adf40 YS |
1186 | } |
1187 | ||
2ad3d716 AE |
1188 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1189 | u64 *snap_features) | |
602adf40 | 1190 | { |
2ad3d716 AE |
1191 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1192 | if (snap_id == CEPH_NOSNAP) { | |
1193 | *snap_features = rbd_dev->header.features; | |
1194 | } else if (rbd_dev->image_format == 1) { | |
1195 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1196 | } else { |
2ad3d716 AE |
1197 | u64 features = 0; |
1198 | int ret; | |
8b0241f8 | 1199 | |
2ad3d716 AE |
1200 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1201 | if (ret) | |
1202 | return ret; | |
1203 | ||
1204 | *snap_features = features; | |
1205 | } | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1210 | { | |
8f4b7d98 | 1211 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1212 | u64 size = 0; |
1213 | u64 features = 0; | |
1214 | int ret; | |
1215 | ||
2ad3d716 AE |
1216 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1217 | if (ret) | |
1218 | return ret; | |
1219 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1220 | if (ret) | |
1221 | return ret; | |
1222 | ||
1223 | rbd_dev->mapping.size = size; | |
1224 | rbd_dev->mapping.features = features; | |
1225 | ||
8b0241f8 | 1226 | return 0; |
602adf40 YS |
1227 | } |
1228 | ||
d1cf5788 AE |
1229 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1230 | { | |
1231 | rbd_dev->mapping.size = 0; | |
1232 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1233 | } |
1234 | ||
65ccfe21 AE |
1235 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1236 | { | |
5bc3fb17 | 1237 | u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
602adf40 | 1238 | |
65ccfe21 AE |
1239 | return offset & (segment_size - 1); |
1240 | } | |
1241 | ||
1242 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1243 | u64 offset, u64 length) | |
1244 | { | |
5bc3fb17 | 1245 | u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
65ccfe21 AE |
1246 | |
1247 | offset &= segment_size - 1; | |
1248 | ||
aafb230e | 1249 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1250 | if (offset + length > segment_size) |
1251 | length = segment_size - offset; | |
1252 | ||
1253 | return length; | |
602adf40 YS |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * bio helpers | |
1258 | */ | |
1259 | ||
1260 | static void bio_chain_put(struct bio *chain) | |
1261 | { | |
1262 | struct bio *tmp; | |
1263 | ||
1264 | while (chain) { | |
1265 | tmp = chain; | |
1266 | chain = chain->bi_next; | |
1267 | bio_put(tmp); | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * zeros a bio chain, starting at specific offset | |
1273 | */ | |
1274 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1275 | { | |
7988613b KO |
1276 | struct bio_vec bv; |
1277 | struct bvec_iter iter; | |
602adf40 YS |
1278 | unsigned long flags; |
1279 | void *buf; | |
602adf40 YS |
1280 | int pos = 0; |
1281 | ||
1282 | while (chain) { | |
7988613b KO |
1283 | bio_for_each_segment(bv, chain, iter) { |
1284 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1285 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1286 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1287 | memset(buf + remainder, 0, |
7988613b KO |
1288 | bv.bv_len - remainder); |
1289 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1290 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1291 | } |
7988613b | 1292 | pos += bv.bv_len; |
602adf40 YS |
1293 | } |
1294 | ||
1295 | chain = chain->bi_next; | |
1296 | } | |
1297 | } | |
1298 | ||
b9434c5b AE |
1299 | /* |
1300 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1301 | * starting at the given byte offset from the start of the array and | |
1302 | * continuing up to the given end offset. The pages array is | |
1303 | * assumed to be big enough to hold all bytes up to the end. | |
1304 | */ | |
1305 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1306 | { | |
1307 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1308 | ||
1309 | rbd_assert(end > offset); | |
1310 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1311 | while (offset < end) { | |
1312 | size_t page_offset; | |
1313 | size_t length; | |
1314 | unsigned long flags; | |
1315 | void *kaddr; | |
1316 | ||
491205a8 GU |
1317 | page_offset = offset & ~PAGE_MASK; |
1318 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1319 | local_irq_save(flags); |
1320 | kaddr = kmap_atomic(*page); | |
1321 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1322 | flush_dcache_page(*page); |
b9434c5b AE |
1323 | kunmap_atomic(kaddr); |
1324 | local_irq_restore(flags); | |
1325 | ||
1326 | offset += length; | |
1327 | page++; | |
1328 | } | |
1329 | } | |
1330 | ||
602adf40 | 1331 | /* |
f7760dad AE |
1332 | * Clone a portion of a bio, starting at the given byte offset |
1333 | * and continuing for the number of bytes indicated. | |
602adf40 | 1334 | */ |
f7760dad AE |
1335 | static struct bio *bio_clone_range(struct bio *bio_src, |
1336 | unsigned int offset, | |
1337 | unsigned int len, | |
1338 | gfp_t gfpmask) | |
602adf40 | 1339 | { |
f7760dad AE |
1340 | struct bio *bio; |
1341 | ||
f856dc36 | 1342 | bio = bio_clone_fast(bio_src, gfpmask, rbd_bio_clone); |
f7760dad AE |
1343 | if (!bio) |
1344 | return NULL; /* ENOMEM */ | |
602adf40 | 1345 | |
5341a627 | 1346 | bio_advance(bio, offset); |
4f024f37 | 1347 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1348 | |
1349 | return bio; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Clone a portion of a bio chain, starting at the given byte offset | |
1354 | * into the first bio in the source chain and continuing for the | |
1355 | * number of bytes indicated. The result is another bio chain of | |
1356 | * exactly the given length, or a null pointer on error. | |
1357 | * | |
1358 | * The bio_src and offset parameters are both in-out. On entry they | |
1359 | * refer to the first source bio and the offset into that bio where | |
1360 | * the start of data to be cloned is located. | |
1361 | * | |
1362 | * On return, bio_src is updated to refer to the bio in the source | |
1363 | * chain that contains first un-cloned byte, and *offset will | |
1364 | * contain the offset of that byte within that bio. | |
1365 | */ | |
1366 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1367 | unsigned int *offset, | |
1368 | unsigned int len, | |
1369 | gfp_t gfpmask) | |
1370 | { | |
1371 | struct bio *bi = *bio_src; | |
1372 | unsigned int off = *offset; | |
1373 | struct bio *chain = NULL; | |
1374 | struct bio **end; | |
1375 | ||
1376 | /* Build up a chain of clone bios up to the limit */ | |
1377 | ||
4f024f37 | 1378 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1379 | return NULL; /* Nothing to clone */ |
602adf40 | 1380 | |
f7760dad AE |
1381 | end = &chain; |
1382 | while (len) { | |
1383 | unsigned int bi_size; | |
1384 | struct bio *bio; | |
1385 | ||
f5400b7a AE |
1386 | if (!bi) { |
1387 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1388 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1389 | } |
4f024f37 | 1390 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1391 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1392 | if (!bio) | |
1393 | goto out_err; /* ENOMEM */ | |
1394 | ||
1395 | *end = bio; | |
1396 | end = &bio->bi_next; | |
602adf40 | 1397 | |
f7760dad | 1398 | off += bi_size; |
4f024f37 | 1399 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1400 | bi = bi->bi_next; |
1401 | off = 0; | |
1402 | } | |
1403 | len -= bi_size; | |
1404 | } | |
1405 | *bio_src = bi; | |
1406 | *offset = off; | |
1407 | ||
1408 | return chain; | |
1409 | out_err: | |
1410 | bio_chain_put(chain); | |
602adf40 | 1411 | |
602adf40 YS |
1412 | return NULL; |
1413 | } | |
1414 | ||
926f9b3f AE |
1415 | /* |
1416 | * The default/initial value for all object request flags is 0. For | |
1417 | * each flag, once its value is set to 1 it is never reset to 0 | |
1418 | * again. | |
1419 | */ | |
57acbaa7 | 1420 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1421 | { |
57acbaa7 | 1422 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1423 | struct rbd_device *rbd_dev; |
1424 | ||
57acbaa7 | 1425 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1426 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1427 | obj_request); |
1428 | } | |
1429 | } | |
1430 | ||
57acbaa7 | 1431 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1432 | { |
1433 | smp_mb(); | |
57acbaa7 | 1434 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1435 | } |
1436 | ||
57acbaa7 | 1437 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1438 | { |
57acbaa7 AE |
1439 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1440 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1441 | |
57acbaa7 AE |
1442 | if (obj_request_img_data_test(obj_request)) |
1443 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1444 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1445 | obj_request); |
1446 | } | |
1447 | } | |
1448 | ||
57acbaa7 | 1449 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1450 | { |
1451 | smp_mb(); | |
57acbaa7 | 1452 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1453 | } |
1454 | ||
5679c59f AE |
1455 | /* |
1456 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1457 | * flag. The latter is set based on the "exists" value provided. | |
1458 | * | |
1459 | * Note that for our purposes once an object exists it never goes | |
1460 | * away again. It's possible that the response from two existence | |
1461 | * checks are separated by the creation of the target object, and | |
1462 | * the first ("doesn't exist") response arrives *after* the second | |
1463 | * ("does exist"). In that case we ignore the second one. | |
1464 | */ | |
1465 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1466 | bool exists) | |
1467 | { | |
1468 | if (exists) | |
1469 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1470 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1471 | smp_mb(); | |
1472 | } | |
1473 | ||
1474 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1475 | { | |
1476 | smp_mb(); | |
1477 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1478 | } | |
1479 | ||
1480 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1481 | { | |
1482 | smp_mb(); | |
1483 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1484 | } | |
1485 | ||
9638556a ID |
1486 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1487 | { | |
1488 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1489 | ||
1490 | return obj_request->img_offset < | |
1491 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1492 | } | |
1493 | ||
bf0d5f50 AE |
1494 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1495 | { | |
37206ee5 | 1496 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1497 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1498 | kref_get(&obj_request->kref); |
1499 | } | |
1500 | ||
1501 | static void rbd_obj_request_destroy(struct kref *kref); | |
1502 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1503 | { | |
1504 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1505 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1506 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1507 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1508 | } | |
1509 | ||
0f2d5be7 AE |
1510 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1511 | { | |
1512 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1513 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1514 | kref_get(&img_request->kref); |
1515 | } | |
1516 | ||
e93f3152 AE |
1517 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1518 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1519 | static void rbd_img_request_destroy(struct kref *kref); |
1520 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1521 | { | |
1522 | rbd_assert(img_request != NULL); | |
37206ee5 | 1523 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1524 | kref_read(&img_request->kref)); |
e93f3152 AE |
1525 | if (img_request_child_test(img_request)) |
1526 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1527 | else | |
1528 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1529 | } |
1530 | ||
1531 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1532 | struct rbd_obj_request *obj_request) | |
1533 | { | |
25dcf954 AE |
1534 | rbd_assert(obj_request->img_request == NULL); |
1535 | ||
b155e86c | 1536 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1537 | obj_request->img_request = img_request; |
25dcf954 | 1538 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1539 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1540 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1541 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1542 | img_request->obj_request_count++; |
1543 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1544 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1545 | obj_request->which); | |
bf0d5f50 AE |
1546 | } |
1547 | ||
1548 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1549 | struct rbd_obj_request *obj_request) | |
1550 | { | |
1551 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1552 | |
37206ee5 AE |
1553 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1554 | obj_request->which); | |
bf0d5f50 | 1555 | list_del(&obj_request->links); |
25dcf954 AE |
1556 | rbd_assert(img_request->obj_request_count > 0); |
1557 | img_request->obj_request_count--; | |
1558 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1559 | obj_request->which = BAD_WHICH; | |
6365d33a | 1560 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1561 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1562 | obj_request->img_request = NULL; |
25dcf954 | 1563 | obj_request->callback = NULL; |
bf0d5f50 AE |
1564 | rbd_obj_request_put(obj_request); |
1565 | } | |
1566 | ||
1567 | static bool obj_request_type_valid(enum obj_request_type type) | |
1568 | { | |
1569 | switch (type) { | |
9969ebc5 | 1570 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1571 | case OBJ_REQUEST_BIO: |
788e2df3 | 1572 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1573 | return true; |
1574 | default: | |
1575 | return false; | |
1576 | } | |
1577 | } | |
1578 | ||
4a17dadc ID |
1579 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request); |
1580 | ||
980917fc | 1581 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1582 | { |
980917fc ID |
1583 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1584 | ||
a90bb0c1 ID |
1585 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
1586 | obj_request, obj_request->object_no, obj_request->offset, | |
67e2b652 | 1587 | obj_request->length, osd_req); |
4a17dadc ID |
1588 | if (obj_request_img_data_test(obj_request)) { |
1589 | WARN_ON(obj_request->callback != rbd_img_obj_callback); | |
1590 | rbd_img_request_get(obj_request->img_request); | |
1591 | } | |
980917fc | 1592 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1593 | } |
1594 | ||
1595 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1596 | { | |
55f27e09 | 1597 | |
37206ee5 | 1598 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1599 | |
1600 | /* | |
1601 | * If no error occurred, compute the aggregate transfer | |
1602 | * count for the image request. We could instead use | |
1603 | * atomic64_cmpxchg() to update it as each object request | |
1604 | * completes; not clear which way is better off hand. | |
1605 | */ | |
1606 | if (!img_request->result) { | |
1607 | struct rbd_obj_request *obj_request; | |
1608 | u64 xferred = 0; | |
1609 | ||
1610 | for_each_obj_request(img_request, obj_request) | |
1611 | xferred += obj_request->xferred; | |
1612 | img_request->xferred = xferred; | |
1613 | } | |
1614 | ||
bf0d5f50 AE |
1615 | if (img_request->callback) |
1616 | img_request->callback(img_request); | |
1617 | else | |
1618 | rbd_img_request_put(img_request); | |
1619 | } | |
1620 | ||
0c425248 AE |
1621 | /* |
1622 | * The default/initial value for all image request flags is 0. Each | |
1623 | * is conditionally set to 1 at image request initialization time | |
1624 | * and currently never change thereafter. | |
1625 | */ | |
1626 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1627 | { | |
1628 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1629 | smp_mb(); | |
1630 | } | |
1631 | ||
1632 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1633 | { | |
1634 | smp_mb(); | |
1635 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1636 | } | |
1637 | ||
90e98c52 GZ |
1638 | /* |
1639 | * Set the discard flag when the img_request is an discard request | |
1640 | */ | |
1641 | static void img_request_discard_set(struct rbd_img_request *img_request) | |
1642 | { | |
1643 | set_bit(IMG_REQ_DISCARD, &img_request->flags); | |
1644 | smp_mb(); | |
1645 | } | |
1646 | ||
1647 | static bool img_request_discard_test(struct rbd_img_request *img_request) | |
1648 | { | |
1649 | smp_mb(); | |
1650 | return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; | |
1651 | } | |
1652 | ||
9849e986 AE |
1653 | static void img_request_child_set(struct rbd_img_request *img_request) |
1654 | { | |
1655 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1656 | smp_mb(); | |
1657 | } | |
1658 | ||
e93f3152 AE |
1659 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1660 | { | |
1661 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1662 | smp_mb(); | |
1663 | } | |
1664 | ||
9849e986 AE |
1665 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1666 | { | |
1667 | smp_mb(); | |
1668 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1669 | } | |
1670 | ||
d0b2e944 AE |
1671 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1672 | { | |
1673 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1674 | smp_mb(); | |
1675 | } | |
1676 | ||
a2acd00e AE |
1677 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1678 | { | |
1679 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1680 | smp_mb(); | |
1681 | } | |
1682 | ||
d0b2e944 AE |
1683 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1684 | { | |
1685 | smp_mb(); | |
1686 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1687 | } | |
1688 | ||
3b434a2a JD |
1689 | static enum obj_operation_type |
1690 | rbd_img_request_op_type(struct rbd_img_request *img_request) | |
1691 | { | |
1692 | if (img_request_write_test(img_request)) | |
1693 | return OBJ_OP_WRITE; | |
1694 | else if (img_request_discard_test(img_request)) | |
1695 | return OBJ_OP_DISCARD; | |
1696 | else | |
1697 | return OBJ_OP_READ; | |
1698 | } | |
1699 | ||
6e2a4505 AE |
1700 | static void |
1701 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1702 | { | |
b9434c5b AE |
1703 | u64 xferred = obj_request->xferred; |
1704 | u64 length = obj_request->length; | |
1705 | ||
6e2a4505 AE |
1706 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1707 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1708 | xferred, length); |
6e2a4505 | 1709 | /* |
17c1cc1d JD |
1710 | * ENOENT means a hole in the image. We zero-fill the entire |
1711 | * length of the request. A short read also implies zero-fill | |
1712 | * to the end of the request. An error requires the whole | |
1713 | * length of the request to be reported finished with an error | |
1714 | * to the block layer. In each case we update the xferred | |
1715 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1716 | */ |
b9434c5b | 1717 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1718 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1719 | if (obj_request->type == OBJ_REQUEST_BIO) |
1720 | zero_bio_chain(obj_request->bio_list, 0); | |
1721 | else | |
1722 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1723 | obj_request->result = 0; |
b9434c5b AE |
1724 | } else if (xferred < length && !obj_request->result) { |
1725 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1726 | zero_bio_chain(obj_request->bio_list, xferred); | |
1727 | else | |
1728 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1729 | } |
17c1cc1d | 1730 | obj_request->xferred = length; |
6e2a4505 AE |
1731 | obj_request_done_set(obj_request); |
1732 | } | |
1733 | ||
bf0d5f50 AE |
1734 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1735 | { | |
37206ee5 AE |
1736 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1737 | obj_request->callback); | |
2e584bce | 1738 | obj_request->callback(obj_request); |
bf0d5f50 AE |
1739 | } |
1740 | ||
0dcc685e ID |
1741 | static void rbd_obj_request_error(struct rbd_obj_request *obj_request, int err) |
1742 | { | |
1743 | obj_request->result = err; | |
1744 | obj_request->xferred = 0; | |
1745 | /* | |
1746 | * kludge - mirror rbd_obj_request_submit() to match a put in | |
1747 | * rbd_img_obj_callback() | |
1748 | */ | |
1749 | if (obj_request_img_data_test(obj_request)) { | |
1750 | WARN_ON(obj_request->callback != rbd_img_obj_callback); | |
1751 | rbd_img_request_get(obj_request->img_request); | |
1752 | } | |
1753 | obj_request_done_set(obj_request); | |
1754 | rbd_obj_request_complete(obj_request); | |
1755 | } | |
1756 | ||
c47f9371 | 1757 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1758 | { |
57acbaa7 | 1759 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1760 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1761 | bool layered = false; |
1762 | ||
1763 | if (obj_request_img_data_test(obj_request)) { | |
1764 | img_request = obj_request->img_request; | |
1765 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1766 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1767 | } |
8b3e1a56 AE |
1768 | |
1769 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1770 | obj_request, img_request, obj_request->result, | |
1771 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1772 | if (layered && obj_request->result == -ENOENT && |
1773 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1774 | rbd_img_parent_read(obj_request); |
1775 | else if (img_request) | |
6e2a4505 AE |
1776 | rbd_img_obj_request_read_callback(obj_request); |
1777 | else | |
1778 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1779 | } |
1780 | ||
c47f9371 | 1781 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1782 | { |
1b83bef2 SW |
1783 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1784 | obj_request->result, obj_request->length); | |
1785 | /* | |
8b3e1a56 AE |
1786 | * There is no such thing as a successful short write. Set |
1787 | * it to our originally-requested length. | |
1b83bef2 SW |
1788 | */ |
1789 | obj_request->xferred = obj_request->length; | |
07741308 | 1790 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1791 | } |
1792 | ||
90e98c52 GZ |
1793 | static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
1794 | { | |
1795 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, | |
1796 | obj_request->result, obj_request->length); | |
1797 | /* | |
1798 | * There is no such thing as a successful short discard. Set | |
1799 | * it to our originally-requested length. | |
1800 | */ | |
1801 | obj_request->xferred = obj_request->length; | |
d0265de7 JD |
1802 | /* discarding a non-existent object is not a problem */ |
1803 | if (obj_request->result == -ENOENT) | |
1804 | obj_request->result = 0; | |
90e98c52 GZ |
1805 | obj_request_done_set(obj_request); |
1806 | } | |
1807 | ||
fbfab539 AE |
1808 | /* |
1809 | * For a simple stat call there's nothing to do. We'll do more if | |
1810 | * this is part of a write sequence for a layered image. | |
1811 | */ | |
c47f9371 | 1812 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1813 | { |
37206ee5 | 1814 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1815 | obj_request_done_set(obj_request); |
1816 | } | |
1817 | ||
2761713d ID |
1818 | static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) |
1819 | { | |
1820 | dout("%s: obj %p\n", __func__, obj_request); | |
1821 | ||
1822 | if (obj_request_img_data_test(obj_request)) | |
1823 | rbd_osd_copyup_callback(obj_request); | |
1824 | else | |
1825 | obj_request_done_set(obj_request); | |
1826 | } | |
1827 | ||
85e084fe | 1828 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 AE |
1829 | { |
1830 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1831 | u16 opcode; |
1832 | ||
85e084fe | 1833 | dout("%s: osd_req %p\n", __func__, osd_req); |
bf0d5f50 | 1834 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1835 | if (obj_request_img_data_test(obj_request)) { |
1836 | rbd_assert(obj_request->img_request); | |
1837 | rbd_assert(obj_request->which != BAD_WHICH); | |
1838 | } else { | |
1839 | rbd_assert(obj_request->which == BAD_WHICH); | |
1840 | } | |
bf0d5f50 | 1841 | |
1b83bef2 SW |
1842 | if (osd_req->r_result < 0) |
1843 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1844 | |
c47f9371 AE |
1845 | /* |
1846 | * We support a 64-bit length, but ultimately it has to be | |
7ad18afa CH |
1847 | * passed to the block layer, which just supports a 32-bit |
1848 | * length field. | |
c47f9371 | 1849 | */ |
7665d85b | 1850 | obj_request->xferred = osd_req->r_ops[0].outdata_len; |
8b3e1a56 | 1851 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1852 | |
79528734 | 1853 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1854 | switch (opcode) { |
1855 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1856 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1857 | break; |
0ccd5926 | 1858 | case CEPH_OSD_OP_SETALLOCHINT: |
e30b7577 ID |
1859 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE || |
1860 | osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL); | |
0ccd5926 | 1861 | /* fall through */ |
bf0d5f50 | 1862 | case CEPH_OSD_OP_WRITE: |
e30b7577 | 1863 | case CEPH_OSD_OP_WRITEFULL: |
c47f9371 | 1864 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1865 | break; |
fbfab539 | 1866 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1867 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1868 | break; |
90e98c52 GZ |
1869 | case CEPH_OSD_OP_DELETE: |
1870 | case CEPH_OSD_OP_TRUNCATE: | |
1871 | case CEPH_OSD_OP_ZERO: | |
1872 | rbd_osd_discard_callback(obj_request); | |
1873 | break; | |
36be9a76 | 1874 | case CEPH_OSD_OP_CALL: |
2761713d ID |
1875 | rbd_osd_call_callback(obj_request); |
1876 | break; | |
bf0d5f50 | 1877 | default: |
a90bb0c1 ID |
1878 | rbd_warn(NULL, "unexpected OSD op: object_no %016llx opcode %d", |
1879 | obj_request->object_no, opcode); | |
bf0d5f50 AE |
1880 | break; |
1881 | } | |
1882 | ||
07741308 | 1883 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1884 | rbd_obj_request_complete(obj_request); |
1885 | } | |
1886 | ||
9d4df01f | 1887 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1888 | { |
8c042b0d | 1889 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1890 | |
7c84883a ID |
1891 | rbd_assert(obj_request_img_data_test(obj_request)); |
1892 | osd_req->r_snapid = obj_request->img_request->snap_id; | |
9d4df01f AE |
1893 | } |
1894 | ||
1895 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1896 | { | |
9d4df01f | 1897 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1898 | |
1134e091 | 1899 | ktime_get_real_ts(&osd_req->r_mtime); |
bb873b53 | 1900 | osd_req->r_data_offset = obj_request->offset; |
430c28c3 AE |
1901 | } |
1902 | ||
bc81207e ID |
1903 | static struct ceph_osd_request * |
1904 | __rbd_osd_req_create(struct rbd_device *rbd_dev, | |
1905 | struct ceph_snap_context *snapc, | |
1906 | int num_ops, unsigned int flags, | |
1907 | struct rbd_obj_request *obj_request) | |
1908 | { | |
1909 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
1910 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1911 | const char *name_format = rbd_dev->image_format == 1 ? |
1912 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e ID |
1913 | |
1914 | req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO); | |
1915 | if (!req) | |
1916 | return NULL; | |
1917 | ||
1918 | req->r_flags = flags; | |
1919 | req->r_callback = rbd_osd_req_callback; | |
1920 | req->r_priv = obj_request; | |
1921 | ||
1922 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; | |
a90bb0c1 ID |
1923 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
1924 | rbd_dev->header.object_prefix, obj_request->object_no)) | |
bc81207e ID |
1925 | goto err_req; |
1926 | ||
1927 | if (ceph_osdc_alloc_messages(req, GFP_NOIO)) | |
1928 | goto err_req; | |
1929 | ||
1930 | return req; | |
1931 | ||
1932 | err_req: | |
1933 | ceph_osdc_put_request(req); | |
1934 | return NULL; | |
1935 | } | |
1936 | ||
0ccd5926 ID |
1937 | /* |
1938 | * Create an osd request. A read request has one osd op (read). | |
1939 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1940 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1941 | * technically osd watch is a write request, hence this distinction.) | |
1942 | */ | |
bf0d5f50 AE |
1943 | static struct ceph_osd_request *rbd_osd_req_create( |
1944 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1945 | enum obj_operation_type op_type, |
deb236b3 | 1946 | unsigned int num_ops, |
430c28c3 | 1947 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1948 | { |
bf0d5f50 | 1949 | struct ceph_snap_context *snapc = NULL; |
bf0d5f50 | 1950 | |
90e98c52 GZ |
1951 | if (obj_request_img_data_test(obj_request) && |
1952 | (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { | |
6365d33a | 1953 | struct rbd_img_request *img_request = obj_request->img_request; |
90e98c52 GZ |
1954 | if (op_type == OBJ_OP_WRITE) { |
1955 | rbd_assert(img_request_write_test(img_request)); | |
1956 | } else { | |
1957 | rbd_assert(img_request_discard_test(img_request)); | |
1958 | } | |
6d2940c8 | 1959 | snapc = img_request->snapc; |
bf0d5f50 AE |
1960 | } |
1961 | ||
6d2940c8 | 1962 | rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
deb236b3 | 1963 | |
bc81207e ID |
1964 | return __rbd_osd_req_create(rbd_dev, snapc, num_ops, |
1965 | (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) ? | |
54ea0046 | 1966 | CEPH_OSD_FLAG_WRITE : CEPH_OSD_FLAG_READ, obj_request); |
bf0d5f50 AE |
1967 | } |
1968 | ||
0eefd470 | 1969 | /* |
d3246fb0 JD |
1970 | * Create a copyup osd request based on the information in the object |
1971 | * request supplied. A copyup request has two or three osd ops, a | |
1972 | * copyup method call, potentially a hint op, and a write or truncate | |
1973 | * or zero op. | |
0eefd470 AE |
1974 | */ |
1975 | static struct ceph_osd_request * | |
1976 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1977 | { | |
1978 | struct rbd_img_request *img_request; | |
d3246fb0 | 1979 | int num_osd_ops = 3; |
0eefd470 AE |
1980 | |
1981 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1982 | img_request = obj_request->img_request; | |
1983 | rbd_assert(img_request); | |
d3246fb0 JD |
1984 | rbd_assert(img_request_write_test(img_request) || |
1985 | img_request_discard_test(img_request)); | |
0eefd470 | 1986 | |
d3246fb0 JD |
1987 | if (img_request_discard_test(img_request)) |
1988 | num_osd_ops = 2; | |
1989 | ||
bc81207e ID |
1990 | return __rbd_osd_req_create(img_request->rbd_dev, |
1991 | img_request->snapc, num_osd_ops, | |
54ea0046 | 1992 | CEPH_OSD_FLAG_WRITE, obj_request); |
0eefd470 AE |
1993 | } |
1994 | ||
bf0d5f50 AE |
1995 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1996 | { | |
1997 | ceph_osdc_put_request(osd_req); | |
1998 | } | |
1999 | ||
6c696d85 ID |
2000 | static struct rbd_obj_request * |
2001 | rbd_obj_request_create(enum obj_request_type type) | |
bf0d5f50 AE |
2002 | { |
2003 | struct rbd_obj_request *obj_request; | |
bf0d5f50 AE |
2004 | |
2005 | rbd_assert(obj_request_type_valid(type)); | |
2006 | ||
5a60e876 | 2007 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 2008 | if (!obj_request) |
f907ad55 | 2009 | return NULL; |
f907ad55 | 2010 | |
bf0d5f50 AE |
2011 | obj_request->which = BAD_WHICH; |
2012 | obj_request->type = type; | |
2013 | INIT_LIST_HEAD(&obj_request->links); | |
bf0d5f50 AE |
2014 | kref_init(&obj_request->kref); |
2015 | ||
67e2b652 | 2016 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
2017 | return obj_request; |
2018 | } | |
2019 | ||
2020 | static void rbd_obj_request_destroy(struct kref *kref) | |
2021 | { | |
2022 | struct rbd_obj_request *obj_request; | |
2023 | ||
2024 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
2025 | ||
37206ee5 AE |
2026 | dout("%s: obj %p\n", __func__, obj_request); |
2027 | ||
bf0d5f50 AE |
2028 | rbd_assert(obj_request->img_request == NULL); |
2029 | rbd_assert(obj_request->which == BAD_WHICH); | |
2030 | ||
2031 | if (obj_request->osd_req) | |
2032 | rbd_osd_req_destroy(obj_request->osd_req); | |
2033 | ||
2034 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
2035 | switch (obj_request->type) { | |
9969ebc5 AE |
2036 | case OBJ_REQUEST_NODATA: |
2037 | break; /* Nothing to do */ | |
bf0d5f50 AE |
2038 | case OBJ_REQUEST_BIO: |
2039 | if (obj_request->bio_list) | |
2040 | bio_chain_put(obj_request->bio_list); | |
2041 | break; | |
788e2df3 | 2042 | case OBJ_REQUEST_PAGES: |
04dc923c ID |
2043 | /* img_data requests don't own their page array */ |
2044 | if (obj_request->pages && | |
2045 | !obj_request_img_data_test(obj_request)) | |
788e2df3 AE |
2046 | ceph_release_page_vector(obj_request->pages, |
2047 | obj_request->page_count); | |
2048 | break; | |
bf0d5f50 AE |
2049 | } |
2050 | ||
868311b1 | 2051 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
2052 | } |
2053 | ||
fb65d228 AE |
2054 | /* It's OK to call this for a device with no parent */ |
2055 | ||
2056 | static void rbd_spec_put(struct rbd_spec *spec); | |
2057 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
2058 | { | |
2059 | rbd_dev_remove_parent(rbd_dev); | |
2060 | rbd_spec_put(rbd_dev->parent_spec); | |
2061 | rbd_dev->parent_spec = NULL; | |
2062 | rbd_dev->parent_overlap = 0; | |
2063 | } | |
2064 | ||
a2acd00e AE |
2065 | /* |
2066 | * Parent image reference counting is used to determine when an | |
2067 | * image's parent fields can be safely torn down--after there are no | |
2068 | * more in-flight requests to the parent image. When the last | |
2069 | * reference is dropped, cleaning them up is safe. | |
2070 | */ | |
2071 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2072 | { | |
2073 | int counter; | |
2074 | ||
2075 | if (!rbd_dev->parent_spec) | |
2076 | return; | |
2077 | ||
2078 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2079 | if (counter > 0) | |
2080 | return; | |
2081 | ||
2082 | /* Last reference; clean up parent data structures */ | |
2083 | ||
2084 | if (!counter) | |
2085 | rbd_dev_unparent(rbd_dev); | |
2086 | else | |
9584d508 | 2087 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
2088 | } |
2089 | ||
2090 | /* | |
2091 | * If an image has a non-zero parent overlap, get a reference to its | |
2092 | * parent. | |
2093 | * | |
2094 | * Returns true if the rbd device has a parent with a non-zero | |
2095 | * overlap and a reference for it was successfully taken, or | |
2096 | * false otherwise. | |
2097 | */ | |
2098 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2099 | { | |
ae43e9d0 | 2100 | int counter = 0; |
a2acd00e AE |
2101 | |
2102 | if (!rbd_dev->parent_spec) | |
2103 | return false; | |
2104 | ||
ae43e9d0 ID |
2105 | down_read(&rbd_dev->header_rwsem); |
2106 | if (rbd_dev->parent_overlap) | |
2107 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2108 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
2109 | |
2110 | if (counter < 0) | |
9584d508 | 2111 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 2112 | |
ae43e9d0 | 2113 | return counter > 0; |
a2acd00e AE |
2114 | } |
2115 | ||
bf0d5f50 AE |
2116 | /* |
2117 | * Caller is responsible for filling in the list of object requests | |
2118 | * that comprises the image request, and the Linux request pointer | |
2119 | * (if there is one). | |
2120 | */ | |
cc344fa1 AE |
2121 | static struct rbd_img_request *rbd_img_request_create( |
2122 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2123 | u64 offset, u64 length, |
6d2940c8 | 2124 | enum obj_operation_type op_type, |
4e752f0a | 2125 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
2126 | { |
2127 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2128 | |
a0c5895b | 2129 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
2130 | if (!img_request) |
2131 | return NULL; | |
2132 | ||
bf0d5f50 AE |
2133 | img_request->rbd_dev = rbd_dev; |
2134 | img_request->offset = offset; | |
2135 | img_request->length = length; | |
90e98c52 GZ |
2136 | if (op_type == OBJ_OP_DISCARD) { |
2137 | img_request_discard_set(img_request); | |
2138 | img_request->snapc = snapc; | |
2139 | } else if (op_type == OBJ_OP_WRITE) { | |
0c425248 | 2140 | img_request_write_set(img_request); |
4e752f0a | 2141 | img_request->snapc = snapc; |
0c425248 | 2142 | } else { |
bf0d5f50 | 2143 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2144 | } |
a2acd00e | 2145 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2146 | img_request_layered_set(img_request); |
a0c5895b | 2147 | |
bf0d5f50 | 2148 | spin_lock_init(&img_request->completion_lock); |
bf0d5f50 AE |
2149 | INIT_LIST_HEAD(&img_request->obj_requests); |
2150 | kref_init(&img_request->kref); | |
2151 | ||
37206ee5 | 2152 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
6d2940c8 | 2153 | obj_op_name(op_type), offset, length, img_request); |
37206ee5 | 2154 | |
bf0d5f50 AE |
2155 | return img_request; |
2156 | } | |
2157 | ||
2158 | static void rbd_img_request_destroy(struct kref *kref) | |
2159 | { | |
2160 | struct rbd_img_request *img_request; | |
2161 | struct rbd_obj_request *obj_request; | |
2162 | struct rbd_obj_request *next_obj_request; | |
2163 | ||
2164 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2165 | ||
37206ee5 AE |
2166 | dout("%s: img %p\n", __func__, img_request); |
2167 | ||
bf0d5f50 AE |
2168 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2169 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2170 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2171 | |
a2acd00e AE |
2172 | if (img_request_layered_test(img_request)) { |
2173 | img_request_layered_clear(img_request); | |
2174 | rbd_dev_parent_put(img_request->rbd_dev); | |
2175 | } | |
2176 | ||
bef95455 JD |
2177 | if (img_request_write_test(img_request) || |
2178 | img_request_discard_test(img_request)) | |
812164f8 | 2179 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2180 | |
1c2a9dfe | 2181 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2182 | } |
2183 | ||
e93f3152 AE |
2184 | static struct rbd_img_request *rbd_parent_request_create( |
2185 | struct rbd_obj_request *obj_request, | |
2186 | u64 img_offset, u64 length) | |
2187 | { | |
2188 | struct rbd_img_request *parent_request; | |
2189 | struct rbd_device *rbd_dev; | |
2190 | ||
2191 | rbd_assert(obj_request->img_request); | |
2192 | rbd_dev = obj_request->img_request->rbd_dev; | |
2193 | ||
4e752f0a | 2194 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
6d2940c8 | 2195 | length, OBJ_OP_READ, NULL); |
e93f3152 AE |
2196 | if (!parent_request) |
2197 | return NULL; | |
2198 | ||
2199 | img_request_child_set(parent_request); | |
2200 | rbd_obj_request_get(obj_request); | |
2201 | parent_request->obj_request = obj_request; | |
2202 | ||
2203 | return parent_request; | |
2204 | } | |
2205 | ||
2206 | static void rbd_parent_request_destroy(struct kref *kref) | |
2207 | { | |
2208 | struct rbd_img_request *parent_request; | |
2209 | struct rbd_obj_request *orig_request; | |
2210 | ||
2211 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2212 | orig_request = parent_request->obj_request; | |
2213 | ||
2214 | parent_request->obj_request = NULL; | |
2215 | rbd_obj_request_put(orig_request); | |
2216 | img_request_child_clear(parent_request); | |
2217 | ||
2218 | rbd_img_request_destroy(kref); | |
2219 | } | |
2220 | ||
1217857f AE |
2221 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2222 | { | |
6365d33a | 2223 | struct rbd_img_request *img_request; |
1217857f AE |
2224 | unsigned int xferred; |
2225 | int result; | |
8b3e1a56 | 2226 | bool more; |
1217857f | 2227 | |
6365d33a AE |
2228 | rbd_assert(obj_request_img_data_test(obj_request)); |
2229 | img_request = obj_request->img_request; | |
2230 | ||
1217857f AE |
2231 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2232 | xferred = (unsigned int)obj_request->xferred; | |
2233 | result = obj_request->result; | |
2234 | if (result) { | |
2235 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
6d2940c8 GZ |
2236 | enum obj_operation_type op_type; |
2237 | ||
90e98c52 GZ |
2238 | if (img_request_discard_test(img_request)) |
2239 | op_type = OBJ_OP_DISCARD; | |
2240 | else if (img_request_write_test(img_request)) | |
2241 | op_type = OBJ_OP_WRITE; | |
2242 | else | |
2243 | op_type = OBJ_OP_READ; | |
1217857f | 2244 | |
9584d508 | 2245 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
6d2940c8 GZ |
2246 | obj_op_name(op_type), obj_request->length, |
2247 | obj_request->img_offset, obj_request->offset); | |
9584d508 | 2248 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
2249 | result, xferred); |
2250 | if (!img_request->result) | |
2251 | img_request->result = result; | |
082a75da ID |
2252 | /* |
2253 | * Need to end I/O on the entire obj_request worth of | |
2254 | * bytes in case of error. | |
2255 | */ | |
2256 | xferred = obj_request->length; | |
1217857f AE |
2257 | } |
2258 | ||
8b3e1a56 AE |
2259 | if (img_request_child_test(img_request)) { |
2260 | rbd_assert(img_request->obj_request != NULL); | |
2261 | more = obj_request->which < img_request->obj_request_count - 1; | |
2262 | } else { | |
2a842aca CH |
2263 | blk_status_t status = errno_to_blk_status(result); |
2264 | ||
8b3e1a56 | 2265 | rbd_assert(img_request->rq != NULL); |
7ad18afa | 2266 | |
2a842aca | 2267 | more = blk_update_request(img_request->rq, status, xferred); |
7ad18afa | 2268 | if (!more) |
2a842aca | 2269 | __blk_mq_end_request(img_request->rq, status); |
8b3e1a56 AE |
2270 | } |
2271 | ||
2272 | return more; | |
1217857f AE |
2273 | } |
2274 | ||
2169238d AE |
2275 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2276 | { | |
2277 | struct rbd_img_request *img_request; | |
2278 | u32 which = obj_request->which; | |
2279 | bool more = true; | |
2280 | ||
6365d33a | 2281 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2282 | img_request = obj_request->img_request; |
2283 | ||
2284 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2285 | rbd_assert(img_request != NULL); | |
2169238d AE |
2286 | rbd_assert(img_request->obj_request_count > 0); |
2287 | rbd_assert(which != BAD_WHICH); | |
2288 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2289 | |
2290 | spin_lock_irq(&img_request->completion_lock); | |
2291 | if (which != img_request->next_completion) | |
2292 | goto out; | |
2293 | ||
2294 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2295 | rbd_assert(more); |
2296 | rbd_assert(which < img_request->obj_request_count); | |
2297 | ||
2298 | if (!obj_request_done_test(obj_request)) | |
2299 | break; | |
1217857f | 2300 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2301 | which++; |
2302 | } | |
2303 | ||
2304 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2305 | img_request->next_completion = which; | |
2306 | out: | |
2307 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2308 | rbd_img_request_put(img_request); |
2169238d AE |
2309 | |
2310 | if (!more) | |
2311 | rbd_img_request_complete(img_request); | |
2312 | } | |
2313 | ||
3b434a2a JD |
2314 | /* |
2315 | * Add individual osd ops to the given ceph_osd_request and prepare | |
2316 | * them for submission. num_ops is the current number of | |
2317 | * osd operations already to the object request. | |
2318 | */ | |
2319 | static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, | |
2320 | struct ceph_osd_request *osd_request, | |
2321 | enum obj_operation_type op_type, | |
2322 | unsigned int num_ops) | |
2323 | { | |
2324 | struct rbd_img_request *img_request = obj_request->img_request; | |
2325 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2326 | u64 object_size = rbd_obj_bytes(&rbd_dev->header); | |
2327 | u64 offset = obj_request->offset; | |
2328 | u64 length = obj_request->length; | |
2329 | u64 img_end; | |
2330 | u16 opcode; | |
2331 | ||
2332 | if (op_type == OBJ_OP_DISCARD) { | |
d3246fb0 JD |
2333 | if (!offset && length == object_size && |
2334 | (!img_request_layered_test(img_request) || | |
2335 | !obj_request_overlaps_parent(obj_request))) { | |
3b434a2a JD |
2336 | opcode = CEPH_OSD_OP_DELETE; |
2337 | } else if ((offset + length == object_size)) { | |
2338 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2339 | } else { | |
2340 | down_read(&rbd_dev->header_rwsem); | |
2341 | img_end = rbd_dev->header.image_size; | |
2342 | up_read(&rbd_dev->header_rwsem); | |
2343 | ||
2344 | if (obj_request->img_offset + length == img_end) | |
2345 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2346 | else | |
2347 | opcode = CEPH_OSD_OP_ZERO; | |
2348 | } | |
2349 | } else if (op_type == OBJ_OP_WRITE) { | |
e30b7577 ID |
2350 | if (!offset && length == object_size) |
2351 | opcode = CEPH_OSD_OP_WRITEFULL; | |
2352 | else | |
2353 | opcode = CEPH_OSD_OP_WRITE; | |
3b434a2a JD |
2354 | osd_req_op_alloc_hint_init(osd_request, num_ops, |
2355 | object_size, object_size); | |
2356 | num_ops++; | |
2357 | } else { | |
2358 | opcode = CEPH_OSD_OP_READ; | |
2359 | } | |
2360 | ||
7e868b6e | 2361 | if (opcode == CEPH_OSD_OP_DELETE) |
144cba14 | 2362 | osd_req_op_init(osd_request, num_ops, opcode, 0); |
7e868b6e ID |
2363 | else |
2364 | osd_req_op_extent_init(osd_request, num_ops, opcode, | |
2365 | offset, length, 0, 0); | |
2366 | ||
3b434a2a JD |
2367 | if (obj_request->type == OBJ_REQUEST_BIO) |
2368 | osd_req_op_extent_osd_data_bio(osd_request, num_ops, | |
2369 | obj_request->bio_list, length); | |
2370 | else if (obj_request->type == OBJ_REQUEST_PAGES) | |
2371 | osd_req_op_extent_osd_data_pages(osd_request, num_ops, | |
2372 | obj_request->pages, length, | |
2373 | offset & ~PAGE_MASK, false, false); | |
2374 | ||
2375 | /* Discards are also writes */ | |
2376 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) | |
2377 | rbd_osd_req_format_write(obj_request); | |
2378 | else | |
2379 | rbd_osd_req_format_read(obj_request); | |
2380 | } | |
2381 | ||
f1a4739f AE |
2382 | /* |
2383 | * Split up an image request into one or more object requests, each | |
2384 | * to a different object. The "type" parameter indicates whether | |
2385 | * "data_desc" is the pointer to the head of a list of bio | |
2386 | * structures, or the base of a page array. In either case this | |
2387 | * function assumes data_desc describes memory sufficient to hold | |
2388 | * all data described by the image request. | |
2389 | */ | |
2390 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2391 | enum obj_request_type type, | |
2392 | void *data_desc) | |
bf0d5f50 AE |
2393 | { |
2394 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2395 | struct rbd_obj_request *obj_request = NULL; | |
2396 | struct rbd_obj_request *next_obj_request; | |
a158073c | 2397 | struct bio *bio_list = NULL; |
f1a4739f | 2398 | unsigned int bio_offset = 0; |
a158073c | 2399 | struct page **pages = NULL; |
6d2940c8 | 2400 | enum obj_operation_type op_type; |
7da22d29 | 2401 | u64 img_offset; |
bf0d5f50 | 2402 | u64 resid; |
bf0d5f50 | 2403 | |
f1a4739f AE |
2404 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2405 | (int)type, data_desc); | |
37206ee5 | 2406 | |
7da22d29 | 2407 | img_offset = img_request->offset; |
bf0d5f50 | 2408 | resid = img_request->length; |
4dda41d3 | 2409 | rbd_assert(resid > 0); |
3b434a2a | 2410 | op_type = rbd_img_request_op_type(img_request); |
f1a4739f AE |
2411 | |
2412 | if (type == OBJ_REQUEST_BIO) { | |
2413 | bio_list = data_desc; | |
4f024f37 KO |
2414 | rbd_assert(img_offset == |
2415 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
90e98c52 | 2416 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2417 | pages = data_desc; |
2418 | } | |
2419 | ||
bf0d5f50 | 2420 | while (resid) { |
2fa12320 | 2421 | struct ceph_osd_request *osd_req; |
a90bb0c1 | 2422 | u64 object_no = img_offset >> rbd_dev->header.obj_order; |
67e2b652 ID |
2423 | u64 offset = rbd_segment_offset(rbd_dev, img_offset); |
2424 | u64 length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2425 | |
6c696d85 | 2426 | obj_request = rbd_obj_request_create(type); |
bf0d5f50 AE |
2427 | if (!obj_request) |
2428 | goto out_unwind; | |
62054da6 | 2429 | |
a90bb0c1 | 2430 | obj_request->object_no = object_no; |
67e2b652 ID |
2431 | obj_request->offset = offset; |
2432 | obj_request->length = length; | |
2433 | ||
03507db6 JD |
2434 | /* |
2435 | * set obj_request->img_request before creating the | |
2436 | * osd_request so that it gets the right snapc | |
2437 | */ | |
2438 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2439 | |
f1a4739f AE |
2440 | if (type == OBJ_REQUEST_BIO) { |
2441 | unsigned int clone_size; | |
2442 | ||
2443 | rbd_assert(length <= (u64)UINT_MAX); | |
2444 | clone_size = (unsigned int)length; | |
2445 | obj_request->bio_list = | |
2446 | bio_chain_clone_range(&bio_list, | |
2447 | &bio_offset, | |
2448 | clone_size, | |
2224d879 | 2449 | GFP_NOIO); |
f1a4739f | 2450 | if (!obj_request->bio_list) |
62054da6 | 2451 | goto out_unwind; |
90e98c52 | 2452 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2453 | unsigned int page_count; |
2454 | ||
2455 | obj_request->pages = pages; | |
2456 | page_count = (u32)calc_pages_for(offset, length); | |
2457 | obj_request->page_count = page_count; | |
2458 | if ((offset + length) & ~PAGE_MASK) | |
2459 | page_count--; /* more on last page */ | |
2460 | pages += page_count; | |
2461 | } | |
bf0d5f50 | 2462 | |
6d2940c8 GZ |
2463 | osd_req = rbd_osd_req_create(rbd_dev, op_type, |
2464 | (op_type == OBJ_OP_WRITE) ? 2 : 1, | |
2465 | obj_request); | |
2fa12320 | 2466 | if (!osd_req) |
62054da6 | 2467 | goto out_unwind; |
3b434a2a | 2468 | |
2fa12320 | 2469 | obj_request->osd_req = osd_req; |
2169238d | 2470 | obj_request->callback = rbd_img_obj_callback; |
3b434a2a | 2471 | obj_request->img_offset = img_offset; |
9d4df01f | 2472 | |
3b434a2a | 2473 | rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
430c28c3 | 2474 | |
7da22d29 | 2475 | img_offset += length; |
bf0d5f50 AE |
2476 | resid -= length; |
2477 | } | |
2478 | ||
2479 | return 0; | |
2480 | ||
bf0d5f50 AE |
2481 | out_unwind: |
2482 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2483 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2484 | |
2485 | return -ENOMEM; | |
2486 | } | |
2487 | ||
0eefd470 | 2488 | static void |
2761713d | 2489 | rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) |
0eefd470 AE |
2490 | { |
2491 | struct rbd_img_request *img_request; | |
2492 | struct rbd_device *rbd_dev; | |
ebda6408 | 2493 | struct page **pages; |
0eefd470 AE |
2494 | u32 page_count; |
2495 | ||
2761713d ID |
2496 | dout("%s: obj %p\n", __func__, obj_request); |
2497 | ||
d3246fb0 JD |
2498 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
2499 | obj_request->type == OBJ_REQUEST_NODATA); | |
0eefd470 AE |
2500 | rbd_assert(obj_request_img_data_test(obj_request)); |
2501 | img_request = obj_request->img_request; | |
2502 | rbd_assert(img_request); | |
2503 | ||
2504 | rbd_dev = img_request->rbd_dev; | |
2505 | rbd_assert(rbd_dev); | |
0eefd470 | 2506 | |
ebda6408 AE |
2507 | pages = obj_request->copyup_pages; |
2508 | rbd_assert(pages != NULL); | |
0eefd470 | 2509 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2510 | page_count = obj_request->copyup_page_count; |
2511 | rbd_assert(page_count); | |
2512 | obj_request->copyup_page_count = 0; | |
2513 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2514 | |
2515 | /* | |
2516 | * We want the transfer count to reflect the size of the | |
2517 | * original write request. There is no such thing as a | |
2518 | * successful short write, so if the request was successful | |
2519 | * we can just set it to the originally-requested length. | |
2520 | */ | |
2521 | if (!obj_request->result) | |
2522 | obj_request->xferred = obj_request->length; | |
2523 | ||
2761713d | 2524 | obj_request_done_set(obj_request); |
0eefd470 AE |
2525 | } |
2526 | ||
3d7efd18 AE |
2527 | static void |
2528 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2529 | { | |
2530 | struct rbd_obj_request *orig_request; | |
0eefd470 | 2531 | struct ceph_osd_request *osd_req; |
0eefd470 | 2532 | struct rbd_device *rbd_dev; |
3d7efd18 | 2533 | struct page **pages; |
d3246fb0 | 2534 | enum obj_operation_type op_type; |
ebda6408 | 2535 | u32 page_count; |
bbea1c1a | 2536 | int img_result; |
ebda6408 | 2537 | u64 parent_length; |
3d7efd18 AE |
2538 | |
2539 | rbd_assert(img_request_child_test(img_request)); | |
2540 | ||
2541 | /* First get what we need from the image request */ | |
2542 | ||
2543 | pages = img_request->copyup_pages; | |
2544 | rbd_assert(pages != NULL); | |
2545 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2546 | page_count = img_request->copyup_page_count; |
2547 | rbd_assert(page_count); | |
2548 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2549 | |
2550 | orig_request = img_request->obj_request; | |
2551 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2552 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2553 | img_result = img_request->result; |
ebda6408 | 2554 | parent_length = img_request->length; |
fa355112 | 2555 | rbd_assert(img_result || parent_length == img_request->xferred); |
91c6febb | 2556 | rbd_img_request_put(img_request); |
3d7efd18 | 2557 | |
91c6febb AE |
2558 | rbd_assert(orig_request->img_request); |
2559 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2560 | rbd_assert(rbd_dev); |
0eefd470 | 2561 | |
bbea1c1a AE |
2562 | /* |
2563 | * If the overlap has become 0 (most likely because the | |
2564 | * image has been flattened) we need to free the pages | |
2565 | * and re-submit the original write request. | |
2566 | */ | |
2567 | if (!rbd_dev->parent_overlap) { | |
bbea1c1a | 2568 | ceph_release_page_vector(pages, page_count); |
980917fc ID |
2569 | rbd_obj_request_submit(orig_request); |
2570 | return; | |
bbea1c1a | 2571 | } |
0eefd470 | 2572 | |
bbea1c1a | 2573 | if (img_result) |
0eefd470 | 2574 | goto out_err; |
0eefd470 | 2575 | |
8785b1d4 AE |
2576 | /* |
2577 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2578 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2579 | * request. Allocate the new copyup osd request for the |
2580 | * original request, and release the old one. | |
2581 | */ | |
bbea1c1a | 2582 | img_result = -ENOMEM; |
0eefd470 AE |
2583 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2584 | if (!osd_req) | |
2585 | goto out_err; | |
8785b1d4 | 2586 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2587 | orig_request->osd_req = osd_req; |
2588 | orig_request->copyup_pages = pages; | |
ebda6408 | 2589 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2590 | |
0eefd470 | 2591 | /* Initialize the copyup op */ |
3d7efd18 | 2592 | |
0eefd470 | 2593 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2594 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2595 | false, false); |
3d7efd18 | 2596 | |
d3246fb0 | 2597 | /* Add the other op(s) */ |
0eefd470 | 2598 | |
d3246fb0 JD |
2599 | op_type = rbd_img_request_op_type(orig_request->img_request); |
2600 | rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); | |
0eefd470 AE |
2601 | |
2602 | /* All set, send it off. */ | |
2603 | ||
980917fc ID |
2604 | rbd_obj_request_submit(orig_request); |
2605 | return; | |
0eefd470 | 2606 | |
0eefd470 | 2607 | out_err: |
fa355112 | 2608 | ceph_release_page_vector(pages, page_count); |
0dcc685e | 2609 | rbd_obj_request_error(orig_request, img_result); |
3d7efd18 AE |
2610 | } |
2611 | ||
2612 | /* | |
2613 | * Read from the parent image the range of data that covers the | |
2614 | * entire target of the given object request. This is used for | |
2615 | * satisfying a layered image write request when the target of an | |
2616 | * object request from the image request does not exist. | |
2617 | * | |
2618 | * A page array big enough to hold the returned data is allocated | |
2619 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2620 | * When the read completes, this page array will be transferred to | |
2621 | * the original object request for the copyup operation. | |
2622 | * | |
c2e82414 ID |
2623 | * If an error occurs, it is recorded as the result of the original |
2624 | * object request in rbd_img_obj_exists_callback(). | |
3d7efd18 AE |
2625 | */ |
2626 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2627 | { | |
058aa991 | 2628 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
3d7efd18 | 2629 | struct rbd_img_request *parent_request = NULL; |
3d7efd18 AE |
2630 | u64 img_offset; |
2631 | u64 length; | |
2632 | struct page **pages = NULL; | |
2633 | u32 page_count; | |
2634 | int result; | |
2635 | ||
3d7efd18 AE |
2636 | rbd_assert(rbd_dev->parent != NULL); |
2637 | ||
2638 | /* | |
2639 | * Determine the byte range covered by the object in the | |
2640 | * child image to which the original request was to be sent. | |
2641 | */ | |
2642 | img_offset = obj_request->img_offset - obj_request->offset; | |
5bc3fb17 | 2643 | length = rbd_obj_bytes(&rbd_dev->header); |
3d7efd18 | 2644 | |
a9e8ba2c AE |
2645 | /* |
2646 | * There is no defined parent data beyond the parent | |
2647 | * overlap, so limit what we read at that boundary if | |
2648 | * necessary. | |
2649 | */ | |
2650 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2651 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2652 | length = rbd_dev->parent_overlap - img_offset; | |
2653 | } | |
2654 | ||
3d7efd18 AE |
2655 | /* |
2656 | * Allocate a page array big enough to receive the data read | |
2657 | * from the parent. | |
2658 | */ | |
2659 | page_count = (u32)calc_pages_for(0, length); | |
1e37f2f8 | 2660 | pages = ceph_alloc_page_vector(page_count, GFP_NOIO); |
3d7efd18 AE |
2661 | if (IS_ERR(pages)) { |
2662 | result = PTR_ERR(pages); | |
2663 | pages = NULL; | |
2664 | goto out_err; | |
2665 | } | |
2666 | ||
2667 | result = -ENOMEM; | |
e93f3152 AE |
2668 | parent_request = rbd_parent_request_create(obj_request, |
2669 | img_offset, length); | |
3d7efd18 AE |
2670 | if (!parent_request) |
2671 | goto out_err; | |
3d7efd18 AE |
2672 | |
2673 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2674 | if (result) | |
2675 | goto out_err; | |
058aa991 | 2676 | |
3d7efd18 | 2677 | parent_request->copyup_pages = pages; |
ebda6408 | 2678 | parent_request->copyup_page_count = page_count; |
3d7efd18 | 2679 | parent_request->callback = rbd_img_obj_parent_read_full_callback; |
058aa991 | 2680 | |
3d7efd18 AE |
2681 | result = rbd_img_request_submit(parent_request); |
2682 | if (!result) | |
2683 | return 0; | |
2684 | ||
2685 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2686 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2687 | out_err: |
2688 | if (pages) | |
2689 | ceph_release_page_vector(pages, page_count); | |
2690 | if (parent_request) | |
2691 | rbd_img_request_put(parent_request); | |
3d7efd18 AE |
2692 | return result; |
2693 | } | |
2694 | ||
c5b5ef6c AE |
2695 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2696 | { | |
c5b5ef6c | 2697 | struct rbd_obj_request *orig_request; |
638f5abe | 2698 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2699 | int result; |
2700 | ||
2701 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2702 | ||
2703 | /* | |
2704 | * All we need from the object request is the original | |
2705 | * request and the result of the STAT op. Grab those, then | |
2706 | * we're done with the request. | |
2707 | */ | |
2708 | orig_request = obj_request->obj_request; | |
2709 | obj_request->obj_request = NULL; | |
912c317d | 2710 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2711 | rbd_assert(orig_request); |
2712 | rbd_assert(orig_request->img_request); | |
2713 | ||
2714 | result = obj_request->result; | |
2715 | obj_request->result = 0; | |
2716 | ||
2717 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2718 | obj_request, orig_request, result, | |
2719 | obj_request->xferred, obj_request->length); | |
2720 | rbd_obj_request_put(obj_request); | |
2721 | ||
638f5abe AE |
2722 | /* |
2723 | * If the overlap has become 0 (most likely because the | |
980917fc ID |
2724 | * image has been flattened) we need to re-submit the |
2725 | * original request. | |
638f5abe AE |
2726 | */ |
2727 | rbd_dev = orig_request->img_request->rbd_dev; | |
2728 | if (!rbd_dev->parent_overlap) { | |
980917fc ID |
2729 | rbd_obj_request_submit(orig_request); |
2730 | return; | |
638f5abe | 2731 | } |
c5b5ef6c AE |
2732 | |
2733 | /* | |
2734 | * Our only purpose here is to determine whether the object | |
2735 | * exists, and we don't want to treat the non-existence as | |
2736 | * an error. If something else comes back, transfer the | |
2737 | * error to the original request and complete it now. | |
2738 | */ | |
2739 | if (!result) { | |
2740 | obj_request_existence_set(orig_request, true); | |
2741 | } else if (result == -ENOENT) { | |
2742 | obj_request_existence_set(orig_request, false); | |
c2e82414 ID |
2743 | } else { |
2744 | goto fail_orig_request; | |
c5b5ef6c AE |
2745 | } |
2746 | ||
2747 | /* | |
2748 | * Resubmit the original request now that we have recorded | |
2749 | * whether the target object exists. | |
2750 | */ | |
c2e82414 ID |
2751 | result = rbd_img_obj_request_submit(orig_request); |
2752 | if (result) | |
2753 | goto fail_orig_request; | |
2754 | ||
2755 | return; | |
2756 | ||
2757 | fail_orig_request: | |
0dcc685e | 2758 | rbd_obj_request_error(orig_request, result); |
c5b5ef6c AE |
2759 | } |
2760 | ||
2761 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2762 | { | |
058aa991 | 2763 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
c5b5ef6c | 2764 | struct rbd_obj_request *stat_request; |
710214e3 | 2765 | struct page **pages; |
c5b5ef6c AE |
2766 | u32 page_count; |
2767 | size_t size; | |
2768 | int ret; | |
2769 | ||
6c696d85 | 2770 | stat_request = rbd_obj_request_create(OBJ_REQUEST_PAGES); |
710214e3 ID |
2771 | if (!stat_request) |
2772 | return -ENOMEM; | |
2773 | ||
a90bb0c1 ID |
2774 | stat_request->object_no = obj_request->object_no; |
2775 | ||
710214e3 ID |
2776 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
2777 | stat_request); | |
2778 | if (!stat_request->osd_req) { | |
2779 | ret = -ENOMEM; | |
2780 | goto fail_stat_request; | |
2781 | } | |
2782 | ||
c5b5ef6c AE |
2783 | /* |
2784 | * The response data for a STAT call consists of: | |
2785 | * le64 length; | |
2786 | * struct { | |
2787 | * le32 tv_sec; | |
2788 | * le32 tv_nsec; | |
2789 | * } mtime; | |
2790 | */ | |
2791 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2792 | page_count = (u32)calc_pages_for(0, size); | |
1e37f2f8 | 2793 | pages = ceph_alloc_page_vector(page_count, GFP_NOIO); |
710214e3 ID |
2794 | if (IS_ERR(pages)) { |
2795 | ret = PTR_ERR(pages); | |
2796 | goto fail_stat_request; | |
2797 | } | |
c5b5ef6c | 2798 | |
710214e3 ID |
2799 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); |
2800 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2801 | false, false); | |
c5b5ef6c AE |
2802 | |
2803 | rbd_obj_request_get(obj_request); | |
2804 | stat_request->obj_request = obj_request; | |
2805 | stat_request->pages = pages; | |
2806 | stat_request->page_count = page_count; | |
c5b5ef6c AE |
2807 | stat_request->callback = rbd_img_obj_exists_callback; |
2808 | ||
980917fc ID |
2809 | rbd_obj_request_submit(stat_request); |
2810 | return 0; | |
c5b5ef6c | 2811 | |
710214e3 ID |
2812 | fail_stat_request: |
2813 | rbd_obj_request_put(stat_request); | |
c5b5ef6c AE |
2814 | return ret; |
2815 | } | |
2816 | ||
70d045f6 | 2817 | static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
b454e36d | 2818 | { |
058aa991 ID |
2819 | struct rbd_img_request *img_request = obj_request->img_request; |
2820 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
b454e36d | 2821 | |
70d045f6 | 2822 | /* Reads */ |
1c220881 JD |
2823 | if (!img_request_write_test(img_request) && |
2824 | !img_request_discard_test(img_request)) | |
70d045f6 ID |
2825 | return true; |
2826 | ||
2827 | /* Non-layered writes */ | |
2828 | if (!img_request_layered_test(img_request)) | |
2829 | return true; | |
2830 | ||
b454e36d | 2831 | /* |
70d045f6 ID |
2832 | * Layered writes outside of the parent overlap range don't |
2833 | * share any data with the parent. | |
b454e36d | 2834 | */ |
70d045f6 ID |
2835 | if (!obj_request_overlaps_parent(obj_request)) |
2836 | return true; | |
b454e36d | 2837 | |
c622d226 GZ |
2838 | /* |
2839 | * Entire-object layered writes - we will overwrite whatever | |
2840 | * parent data there is anyway. | |
2841 | */ | |
2842 | if (!obj_request->offset && | |
2843 | obj_request->length == rbd_obj_bytes(&rbd_dev->header)) | |
2844 | return true; | |
2845 | ||
70d045f6 ID |
2846 | /* |
2847 | * If the object is known to already exist, its parent data has | |
2848 | * already been copied. | |
2849 | */ | |
2850 | if (obj_request_known_test(obj_request) && | |
2851 | obj_request_exists_test(obj_request)) | |
2852 | return true; | |
2853 | ||
2854 | return false; | |
2855 | } | |
2856 | ||
2857 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) | |
2858 | { | |
058aa991 ID |
2859 | rbd_assert(obj_request_img_data_test(obj_request)); |
2860 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
2861 | rbd_assert(obj_request->img_request); | |
b454e36d | 2862 | |
70d045f6 | 2863 | if (img_obj_request_simple(obj_request)) { |
980917fc ID |
2864 | rbd_obj_request_submit(obj_request); |
2865 | return 0; | |
b454e36d AE |
2866 | } |
2867 | ||
2868 | /* | |
3d7efd18 AE |
2869 | * It's a layered write. The target object might exist but |
2870 | * we may not know that yet. If we know it doesn't exist, | |
2871 | * start by reading the data for the full target object from | |
2872 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2873 | */ |
70d045f6 | 2874 | if (obj_request_known_test(obj_request)) |
3d7efd18 AE |
2875 | return rbd_img_obj_parent_read_full(obj_request); |
2876 | ||
2877 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2878 | |
2879 | return rbd_img_obj_exists_submit(obj_request); | |
2880 | } | |
2881 | ||
bf0d5f50 AE |
2882 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2883 | { | |
bf0d5f50 | 2884 | struct rbd_obj_request *obj_request; |
46faeed4 | 2885 | struct rbd_obj_request *next_obj_request; |
663ae2cc | 2886 | int ret = 0; |
bf0d5f50 | 2887 | |
37206ee5 | 2888 | dout("%s: img %p\n", __func__, img_request); |
bf0d5f50 | 2889 | |
663ae2cc ID |
2890 | rbd_img_request_get(img_request); |
2891 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { | |
b454e36d | 2892 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 | 2893 | if (ret) |
663ae2cc | 2894 | goto out_put_ireq; |
bf0d5f50 AE |
2895 | } |
2896 | ||
663ae2cc ID |
2897 | out_put_ireq: |
2898 | rbd_img_request_put(img_request); | |
2899 | return ret; | |
bf0d5f50 | 2900 | } |
8b3e1a56 AE |
2901 | |
2902 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2903 | { | |
2904 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2905 | struct rbd_device *rbd_dev; |
2906 | u64 obj_end; | |
02c74fba AE |
2907 | u64 img_xferred; |
2908 | int img_result; | |
8b3e1a56 AE |
2909 | |
2910 | rbd_assert(img_request_child_test(img_request)); | |
2911 | ||
02c74fba AE |
2912 | /* First get what we need from the image request and release it */ |
2913 | ||
8b3e1a56 | 2914 | obj_request = img_request->obj_request; |
02c74fba AE |
2915 | img_xferred = img_request->xferred; |
2916 | img_result = img_request->result; | |
2917 | rbd_img_request_put(img_request); | |
2918 | ||
2919 | /* | |
2920 | * If the overlap has become 0 (most likely because the | |
2921 | * image has been flattened) we need to re-submit the | |
2922 | * original request. | |
2923 | */ | |
a9e8ba2c AE |
2924 | rbd_assert(obj_request); |
2925 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
2926 | rbd_dev = obj_request->img_request->rbd_dev; |
2927 | if (!rbd_dev->parent_overlap) { | |
980917fc ID |
2928 | rbd_obj_request_submit(obj_request); |
2929 | return; | |
02c74fba | 2930 | } |
a9e8ba2c | 2931 | |
02c74fba | 2932 | obj_request->result = img_result; |
a9e8ba2c AE |
2933 | if (obj_request->result) |
2934 | goto out; | |
2935 | ||
2936 | /* | |
2937 | * We need to zero anything beyond the parent overlap | |
2938 | * boundary. Since rbd_img_obj_request_read_callback() | |
2939 | * will zero anything beyond the end of a short read, an | |
2940 | * easy way to do this is to pretend the data from the | |
2941 | * parent came up short--ending at the overlap boundary. | |
2942 | */ | |
2943 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2944 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
2945 | if (obj_end > rbd_dev->parent_overlap) { |
2946 | u64 xferred = 0; | |
2947 | ||
2948 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2949 | xferred = rbd_dev->parent_overlap - | |
2950 | obj_request->img_offset; | |
8b3e1a56 | 2951 | |
02c74fba | 2952 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 2953 | } else { |
02c74fba | 2954 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
2955 | } |
2956 | out: | |
8b3e1a56 AE |
2957 | rbd_img_obj_request_read_callback(obj_request); |
2958 | rbd_obj_request_complete(obj_request); | |
2959 | } | |
2960 | ||
2961 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2962 | { | |
8b3e1a56 AE |
2963 | struct rbd_img_request *img_request; |
2964 | int result; | |
2965 | ||
2966 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2967 | rbd_assert(obj_request->img_request != NULL); | |
2968 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 2969 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 2970 | |
8b3e1a56 | 2971 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 2972 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 2973 | obj_request->img_offset, |
e93f3152 | 2974 | obj_request->length); |
8b3e1a56 AE |
2975 | result = -ENOMEM; |
2976 | if (!img_request) | |
2977 | goto out_err; | |
2978 | ||
5b2ab72d AE |
2979 | if (obj_request->type == OBJ_REQUEST_BIO) |
2980 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
2981 | obj_request->bio_list); | |
2982 | else | |
2983 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
2984 | obj_request->pages); | |
8b3e1a56 AE |
2985 | if (result) |
2986 | goto out_err; | |
2987 | ||
2988 | img_request->callback = rbd_img_parent_read_callback; | |
2989 | result = rbd_img_request_submit(img_request); | |
2990 | if (result) | |
2991 | goto out_err; | |
2992 | ||
2993 | return; | |
2994 | out_err: | |
2995 | if (img_request) | |
2996 | rbd_img_request_put(img_request); | |
2997 | obj_request->result = result; | |
2998 | obj_request->xferred = 0; | |
2999 | obj_request_done_set(obj_request); | |
3000 | } | |
bf0d5f50 | 3001 | |
ed95b21a | 3002 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 3003 | |
ed95b21a ID |
3004 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
3005 | const struct rbd_client_id *rhs) | |
3006 | { | |
3007 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
3008 | } | |
3009 | ||
3010 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
3011 | { | |
3012 | struct rbd_client_id cid; | |
3013 | ||
3014 | mutex_lock(&rbd_dev->watch_mutex); | |
3015 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
3016 | cid.handle = rbd_dev->watch_cookie; | |
3017 | mutex_unlock(&rbd_dev->watch_mutex); | |
3018 | return cid; | |
3019 | } | |
3020 | ||
3021 | /* | |
3022 | * lock_rwsem must be held for write | |
3023 | */ | |
3024 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
3025 | const struct rbd_client_id *cid) | |
3026 | { | |
3027 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
3028 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
3029 | cid->gid, cid->handle); | |
3030 | rbd_dev->owner_cid = *cid; /* struct */ | |
3031 | } | |
3032 | ||
3033 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
3034 | { | |
3035 | mutex_lock(&rbd_dev->watch_mutex); | |
3036 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
3037 | mutex_unlock(&rbd_dev->watch_mutex); | |
3038 | } | |
3039 | ||
edd8ca80 FM |
3040 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
3041 | { | |
3042 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
3043 | ||
3044 | strcpy(rbd_dev->lock_cookie, cookie); | |
3045 | rbd_set_owner_cid(rbd_dev, &cid); | |
3046 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
3047 | } | |
3048 | ||
ed95b21a ID |
3049 | /* |
3050 | * lock_rwsem must be held for write | |
3051 | */ | |
3052 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 3053 | { |
922dab61 | 3054 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 3055 | char cookie[32]; |
e627db08 | 3056 | int ret; |
b8d70035 | 3057 | |
cbbfb0ff ID |
3058 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
3059 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 3060 | |
ed95b21a ID |
3061 | format_lock_cookie(rbd_dev, cookie); |
3062 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
3063 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
3064 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 3065 | if (ret) |
ed95b21a | 3066 | return ret; |
b8d70035 | 3067 | |
ed95b21a | 3068 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 3069 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 3070 | return 0; |
b8d70035 AE |
3071 | } |
3072 | ||
ed95b21a ID |
3073 | /* |
3074 | * lock_rwsem must be held for write | |
3075 | */ | |
bbead745 | 3076 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 3077 | { |
922dab61 | 3078 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
3079 | int ret; |
3080 | ||
cbbfb0ff ID |
3081 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
3082 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 3083 | |
ed95b21a | 3084 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 3085 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
3086 | if (ret && ret != -ENOENT) |
3087 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 3088 | |
bbead745 ID |
3089 | /* treat errors as the image is unlocked */ |
3090 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 3091 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
3092 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
3093 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
3094 | } |
3095 | ||
ed95b21a ID |
3096 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
3097 | enum rbd_notify_op notify_op, | |
3098 | struct page ***preply_pages, | |
3099 | size_t *preply_len) | |
9969ebc5 AE |
3100 | { |
3101 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a ID |
3102 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
3103 | int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN; | |
3104 | char buf[buf_size]; | |
3105 | void *p = buf; | |
9969ebc5 | 3106 | |
ed95b21a | 3107 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 3108 | |
ed95b21a ID |
3109 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
3110 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3111 | ceph_encode_32(&p, notify_op); | |
3112 | ceph_encode_64(&p, cid.gid); | |
3113 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 3114 | |
ed95b21a ID |
3115 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
3116 | &rbd_dev->header_oloc, buf, buf_size, | |
3117 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
3118 | } |
3119 | ||
ed95b21a ID |
3120 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
3121 | enum rbd_notify_op notify_op) | |
b30a01f2 | 3122 | { |
ed95b21a ID |
3123 | struct page **reply_pages; |
3124 | size_t reply_len; | |
b30a01f2 | 3125 | |
ed95b21a ID |
3126 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
3127 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
3128 | } | |
b30a01f2 | 3129 | |
ed95b21a ID |
3130 | static void rbd_notify_acquired_lock(struct work_struct *work) |
3131 | { | |
3132 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3133 | acquired_lock_work); | |
76756a51 | 3134 | |
ed95b21a | 3135 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
3136 | } |
3137 | ||
ed95b21a | 3138 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 3139 | { |
ed95b21a ID |
3140 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
3141 | released_lock_work); | |
811c6688 | 3142 | |
ed95b21a | 3143 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
3144 | } |
3145 | ||
ed95b21a | 3146 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 3147 | { |
ed95b21a ID |
3148 | struct page **reply_pages; |
3149 | size_t reply_len; | |
3150 | bool lock_owner_responded = false; | |
36be9a76 AE |
3151 | int ret; |
3152 | ||
ed95b21a | 3153 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 3154 | |
ed95b21a ID |
3155 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
3156 | &reply_pages, &reply_len); | |
3157 | if (ret && ret != -ETIMEDOUT) { | |
3158 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 3159 | goto out; |
ed95b21a | 3160 | } |
36be9a76 | 3161 | |
ed95b21a ID |
3162 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
3163 | void *p = page_address(reply_pages[0]); | |
3164 | void *const end = p + reply_len; | |
3165 | u32 n; | |
36be9a76 | 3166 | |
ed95b21a ID |
3167 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
3168 | while (n--) { | |
3169 | u8 struct_v; | |
3170 | u32 len; | |
36be9a76 | 3171 | |
ed95b21a ID |
3172 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
3173 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 3174 | |
ed95b21a ID |
3175 | ceph_decode_32_safe(&p, end, len, e_inval); |
3176 | if (!len) | |
3177 | continue; | |
3178 | ||
3179 | if (lock_owner_responded) { | |
3180 | rbd_warn(rbd_dev, | |
3181 | "duplicate lock owners detected"); | |
3182 | ret = -EIO; | |
3183 | goto out; | |
3184 | } | |
3185 | ||
3186 | lock_owner_responded = true; | |
3187 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
3188 | &struct_v, &len); | |
3189 | if (ret) { | |
3190 | rbd_warn(rbd_dev, | |
3191 | "failed to decode ResponseMessage: %d", | |
3192 | ret); | |
3193 | goto e_inval; | |
3194 | } | |
3195 | ||
3196 | ret = ceph_decode_32(&p); | |
3197 | } | |
3198 | } | |
3199 | ||
3200 | if (!lock_owner_responded) { | |
3201 | rbd_warn(rbd_dev, "no lock owners detected"); | |
3202 | ret = -ETIMEDOUT; | |
3203 | } | |
3204 | ||
3205 | out: | |
3206 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
3207 | return ret; | |
3208 | ||
3209 | e_inval: | |
3210 | ret = -EINVAL; | |
3211 | goto out; | |
3212 | } | |
3213 | ||
3214 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
3215 | { | |
3216 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
3217 | ||
3218 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
3219 | if (wake_all) | |
3220 | wake_up_all(&rbd_dev->lock_waitq); | |
3221 | else | |
3222 | wake_up(&rbd_dev->lock_waitq); | |
3223 | } | |
3224 | ||
3225 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
3226 | struct ceph_locker **lockers, u32 *num_lockers) | |
3227 | { | |
3228 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3229 | u8 lock_type; | |
3230 | char *lock_tag; | |
3231 | int ret; | |
3232 | ||
3233 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3234 | ||
3235 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
3236 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3237 | &lock_type, &lock_tag, lockers, num_lockers); | |
3238 | if (ret) | |
3239 | return ret; | |
3240 | ||
3241 | if (*num_lockers == 0) { | |
3242 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
3243 | goto out; | |
3244 | } | |
3245 | ||
3246 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
3247 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
3248 | lock_tag); | |
3249 | ret = -EBUSY; | |
3250 | goto out; | |
3251 | } | |
3252 | ||
3253 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
3254 | rbd_warn(rbd_dev, "shared lock type detected"); | |
3255 | ret = -EBUSY; | |
3256 | goto out; | |
3257 | } | |
3258 | ||
3259 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
3260 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
3261 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
3262 | (*lockers)[0].id.cookie); | |
3263 | ret = -EBUSY; | |
3264 | goto out; | |
3265 | } | |
3266 | ||
3267 | out: | |
3268 | kfree(lock_tag); | |
3269 | return ret; | |
3270 | } | |
3271 | ||
3272 | static int find_watcher(struct rbd_device *rbd_dev, | |
3273 | const struct ceph_locker *locker) | |
3274 | { | |
3275 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3276 | struct ceph_watch_item *watchers; | |
3277 | u32 num_watchers; | |
3278 | u64 cookie; | |
3279 | int i; | |
3280 | int ret; | |
3281 | ||
3282 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
3283 | &rbd_dev->header_oloc, &watchers, | |
3284 | &num_watchers); | |
3285 | if (ret) | |
3286 | return ret; | |
3287 | ||
3288 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
3289 | for (i = 0; i < num_watchers; i++) { | |
3290 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
3291 | sizeof(locker->info.addr)) && | |
3292 | watchers[i].cookie == cookie) { | |
3293 | struct rbd_client_id cid = { | |
3294 | .gid = le64_to_cpu(watchers[i].name.num), | |
3295 | .handle = cookie, | |
3296 | }; | |
3297 | ||
3298 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
3299 | rbd_dev, cid.gid, cid.handle); | |
3300 | rbd_set_owner_cid(rbd_dev, &cid); | |
3301 | ret = 1; | |
3302 | goto out; | |
3303 | } | |
3304 | } | |
3305 | ||
3306 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
3307 | ret = 0; | |
3308 | out: | |
3309 | kfree(watchers); | |
3310 | return ret; | |
3311 | } | |
3312 | ||
3313 | /* | |
3314 | * lock_rwsem must be held for write | |
3315 | */ | |
3316 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
3317 | { | |
3318 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3319 | struct ceph_locker *lockers; | |
3320 | u32 num_lockers; | |
3321 | int ret; | |
3322 | ||
3323 | for (;;) { | |
3324 | ret = rbd_lock(rbd_dev); | |
3325 | if (ret != -EBUSY) | |
3326 | return ret; | |
3327 | ||
3328 | /* determine if the current lock holder is still alive */ | |
3329 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
3330 | if (ret) | |
3331 | return ret; | |
3332 | ||
3333 | if (num_lockers == 0) | |
3334 | goto again; | |
3335 | ||
3336 | ret = find_watcher(rbd_dev, lockers); | |
3337 | if (ret) { | |
3338 | if (ret > 0) | |
3339 | ret = 0; /* have to request lock */ | |
3340 | goto out; | |
3341 | } | |
3342 | ||
3343 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
3344 | ENTITY_NAME(lockers[0].id.name)); | |
3345 | ||
3346 | ret = ceph_monc_blacklist_add(&client->monc, | |
3347 | &lockers[0].info.addr); | |
3348 | if (ret) { | |
3349 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
3350 | ENTITY_NAME(lockers[0].id.name), ret); | |
3351 | goto out; | |
3352 | } | |
3353 | ||
3354 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
3355 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3356 | lockers[0].id.cookie, | |
3357 | &lockers[0].id.name); | |
3358 | if (ret && ret != -ENOENT) | |
3359 | goto out; | |
3360 | ||
3361 | again: | |
3362 | ceph_free_lockers(lockers, num_lockers); | |
3363 | } | |
3364 | ||
3365 | out: | |
3366 | ceph_free_lockers(lockers, num_lockers); | |
3367 | return ret; | |
3368 | } | |
3369 | ||
3370 | /* | |
3371 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
3372 | */ | |
3373 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
3374 | int *pret) | |
3375 | { | |
3376 | enum rbd_lock_state lock_state; | |
3377 | ||
3378 | down_read(&rbd_dev->lock_rwsem); | |
3379 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3380 | rbd_dev->lock_state); | |
3381 | if (__rbd_is_lock_owner(rbd_dev)) { | |
3382 | lock_state = rbd_dev->lock_state; | |
3383 | up_read(&rbd_dev->lock_rwsem); | |
3384 | return lock_state; | |
3385 | } | |
3386 | ||
3387 | up_read(&rbd_dev->lock_rwsem); | |
3388 | down_write(&rbd_dev->lock_rwsem); | |
3389 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3390 | rbd_dev->lock_state); | |
3391 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
3392 | *pret = rbd_try_lock(rbd_dev); | |
3393 | if (*pret) | |
3394 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
3395 | } | |
3396 | ||
3397 | lock_state = rbd_dev->lock_state; | |
3398 | up_write(&rbd_dev->lock_rwsem); | |
3399 | return lock_state; | |
3400 | } | |
3401 | ||
3402 | static void rbd_acquire_lock(struct work_struct *work) | |
3403 | { | |
3404 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3405 | struct rbd_device, lock_dwork); | |
3406 | enum rbd_lock_state lock_state; | |
37f13252 | 3407 | int ret = 0; |
ed95b21a ID |
3408 | |
3409 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3410 | again: | |
3411 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
3412 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
3413 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
3414 | wake_requests(rbd_dev, true); | |
3415 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
3416 | rbd_dev, lock_state, ret); | |
3417 | return; | |
3418 | } | |
3419 | ||
3420 | ret = rbd_request_lock(rbd_dev); | |
3421 | if (ret == -ETIMEDOUT) { | |
3422 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
3423 | } else if (ret == -EROFS) { |
3424 | rbd_warn(rbd_dev, "peer will not release lock"); | |
3425 | /* | |
3426 | * If this is rbd_add_acquire_lock(), we want to fail | |
3427 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
3428 | * want to block. | |
3429 | */ | |
3430 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
3431 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
3432 | /* wake "rbd map --exclusive" process */ | |
3433 | wake_requests(rbd_dev, false); | |
3434 | } | |
ed95b21a ID |
3435 | } else if (ret < 0) { |
3436 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3437 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3438 | RBD_RETRY_DELAY); | |
3439 | } else { | |
3440 | /* | |
3441 | * lock owner acked, but resend if we don't see them | |
3442 | * release the lock | |
3443 | */ | |
3444 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3445 | rbd_dev); | |
3446 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3447 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3448 | } | |
3449 | } | |
3450 | ||
3451 | /* | |
3452 | * lock_rwsem must be held for write | |
3453 | */ | |
3454 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3455 | { | |
3456 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3457 | rbd_dev->lock_state); | |
3458 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3459 | return false; | |
3460 | ||
3461 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3462 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3463 | /* |
ed95b21a | 3464 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3465 | * |
ed95b21a ID |
3466 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3467 | * may be shared with other devices. | |
52bb1f9b | 3468 | */ |
ed95b21a ID |
3469 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3470 | up_read(&rbd_dev->lock_rwsem); | |
3471 | ||
3472 | down_write(&rbd_dev->lock_rwsem); | |
3473 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3474 | rbd_dev->lock_state); | |
3475 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3476 | return false; | |
3477 | ||
bbead745 ID |
3478 | rbd_unlock(rbd_dev); |
3479 | /* | |
3480 | * Give others a chance to grab the lock - we would re-acquire | |
3481 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3482 | * otherwise. We need to ack our own notifications, so this | |
3483 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3484 | * after wake_requests() in rbd_handle_released_lock(). | |
3485 | */ | |
3486 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3487 | return true; |
3488 | } | |
3489 | ||
3490 | static void rbd_release_lock_work(struct work_struct *work) | |
3491 | { | |
3492 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3493 | unlock_work); | |
3494 | ||
3495 | down_write(&rbd_dev->lock_rwsem); | |
3496 | rbd_release_lock(rbd_dev); | |
3497 | up_write(&rbd_dev->lock_rwsem); | |
3498 | } | |
3499 | ||
3500 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3501 | void **p) | |
3502 | { | |
3503 | struct rbd_client_id cid = { 0 }; | |
3504 | ||
3505 | if (struct_v >= 2) { | |
3506 | cid.gid = ceph_decode_64(p); | |
3507 | cid.handle = ceph_decode_64(p); | |
3508 | } | |
3509 | ||
3510 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3511 | cid.handle); | |
3512 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3513 | down_write(&rbd_dev->lock_rwsem); | |
3514 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3515 | /* | |
3516 | * we already know that the remote client is | |
3517 | * the owner | |
3518 | */ | |
3519 | up_write(&rbd_dev->lock_rwsem); | |
3520 | return; | |
3521 | } | |
3522 | ||
3523 | rbd_set_owner_cid(rbd_dev, &cid); | |
3524 | downgrade_write(&rbd_dev->lock_rwsem); | |
3525 | } else { | |
3526 | down_read(&rbd_dev->lock_rwsem); | |
3527 | } | |
3528 | ||
3529 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3530 | wake_requests(rbd_dev, false); | |
3531 | up_read(&rbd_dev->lock_rwsem); | |
3532 | } | |
3533 | ||
3534 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3535 | void **p) | |
3536 | { | |
3537 | struct rbd_client_id cid = { 0 }; | |
3538 | ||
3539 | if (struct_v >= 2) { | |
3540 | cid.gid = ceph_decode_64(p); | |
3541 | cid.handle = ceph_decode_64(p); | |
3542 | } | |
3543 | ||
3544 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3545 | cid.handle); | |
3546 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3547 | down_write(&rbd_dev->lock_rwsem); | |
3548 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3549 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3550 | __func__, rbd_dev, cid.gid, cid.handle, | |
3551 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3552 | up_write(&rbd_dev->lock_rwsem); | |
3553 | return; | |
3554 | } | |
3555 | ||
3556 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3557 | downgrade_write(&rbd_dev->lock_rwsem); | |
3558 | } else { | |
3559 | down_read(&rbd_dev->lock_rwsem); | |
3560 | } | |
3561 | ||
3562 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3563 | wake_requests(rbd_dev, false); | |
3564 | up_read(&rbd_dev->lock_rwsem); | |
3565 | } | |
3566 | ||
3b77faa0 ID |
3567 | /* |
3568 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3569 | * ResponseMessage is needed. | |
3570 | */ | |
3571 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3572 | void **p) | |
ed95b21a ID |
3573 | { |
3574 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3575 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3576 | int result = 1; |
ed95b21a ID |
3577 | |
3578 | if (struct_v >= 2) { | |
3579 | cid.gid = ceph_decode_64(p); | |
3580 | cid.handle = ceph_decode_64(p); | |
3581 | } | |
3582 | ||
3583 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3584 | cid.handle); | |
3585 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3586 | return result; |
ed95b21a ID |
3587 | |
3588 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3589 | if (__rbd_is_lock_owner(rbd_dev)) { |
3590 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3591 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3592 | goto out_unlock; | |
3593 | ||
3594 | /* | |
3595 | * encode ResponseMessage(0) so the peer can detect | |
3596 | * a missing owner | |
3597 | */ | |
3598 | result = 0; | |
3599 | ||
3600 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3601 | if (!rbd_dev->opts->exclusive) { |
3602 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3603 | __func__, rbd_dev); | |
3604 | queue_work(rbd_dev->task_wq, | |
3605 | &rbd_dev->unlock_work); | |
3606 | } else { | |
3607 | /* refuse to release the lock */ | |
3608 | result = -EROFS; | |
3609 | } | |
ed95b21a ID |
3610 | } |
3611 | } | |
3b77faa0 ID |
3612 | |
3613 | out_unlock: | |
ed95b21a | 3614 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3615 | return result; |
ed95b21a ID |
3616 | } |
3617 | ||
3618 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3619 | u64 notify_id, u64 cookie, s32 *result) | |
3620 | { | |
3621 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3622 | int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; | |
3623 | char buf[buf_size]; | |
3624 | int ret; | |
3625 | ||
3626 | if (result) { | |
3627 | void *p = buf; | |
3628 | ||
3629 | /* encode ResponseMessage */ | |
3630 | ceph_start_encoding(&p, 1, 1, | |
3631 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3632 | ceph_encode_32(&p, *result); | |
3633 | } else { | |
3634 | buf_size = 0; | |
3635 | } | |
b8d70035 | 3636 | |
922dab61 ID |
3637 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3638 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3639 | buf, buf_size); |
52bb1f9b | 3640 | if (ret) |
ed95b21a ID |
3641 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3642 | } | |
3643 | ||
3644 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3645 | u64 cookie) | |
3646 | { | |
3647 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3648 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3649 | } | |
3650 | ||
3651 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3652 | u64 notify_id, u64 cookie, s32 result) | |
3653 | { | |
3654 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3655 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3656 | } | |
3657 | ||
3658 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3659 | u64 notifier_id, void *data, size_t data_len) | |
3660 | { | |
3661 | struct rbd_device *rbd_dev = arg; | |
3662 | void *p = data; | |
3663 | void *const end = p + data_len; | |
d4c2269b | 3664 | u8 struct_v = 0; |
ed95b21a ID |
3665 | u32 len; |
3666 | u32 notify_op; | |
3667 | int ret; | |
3668 | ||
3669 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3670 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3671 | if (data_len) { | |
3672 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3673 | &struct_v, &len); | |
3674 | if (ret) { | |
3675 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3676 | ret); | |
3677 | return; | |
3678 | } | |
3679 | ||
3680 | notify_op = ceph_decode_32(&p); | |
3681 | } else { | |
3682 | /* legacy notification for header updates */ | |
3683 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3684 | len = 0; | |
3685 | } | |
3686 | ||
3687 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3688 | switch (notify_op) { | |
3689 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3690 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3691 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3692 | break; | |
3693 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3694 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3695 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3696 | break; | |
3697 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3698 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3699 | if (ret <= 0) | |
ed95b21a | 3700 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3701 | cookie, ret); |
ed95b21a ID |
3702 | else |
3703 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3704 | break; | |
3705 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3706 | ret = rbd_dev_refresh(rbd_dev); | |
3707 | if (ret) | |
3708 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3709 | ||
3710 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3711 | break; | |
3712 | default: | |
3713 | if (rbd_is_lock_owner(rbd_dev)) | |
3714 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3715 | cookie, -EOPNOTSUPP); | |
3716 | else | |
3717 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3718 | break; | |
3719 | } | |
b8d70035 AE |
3720 | } |
3721 | ||
99d16943 ID |
3722 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3723 | ||
922dab61 | 3724 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3725 | { |
922dab61 | 3726 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3727 | |
922dab61 | 3728 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3729 | |
ed95b21a ID |
3730 | down_write(&rbd_dev->lock_rwsem); |
3731 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3732 | up_write(&rbd_dev->lock_rwsem); | |
3733 | ||
99d16943 ID |
3734 | mutex_lock(&rbd_dev->watch_mutex); |
3735 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3736 | __rbd_unregister_watch(rbd_dev); | |
3737 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3738 | |
99d16943 | 3739 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3740 | } |
99d16943 | 3741 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3742 | } |
3743 | ||
9969ebc5 | 3744 | /* |
99d16943 | 3745 | * watch_mutex must be locked |
9969ebc5 | 3746 | */ |
99d16943 | 3747 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3748 | { |
3749 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3750 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3751 | |
922dab61 | 3752 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3753 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3754 | |
922dab61 ID |
3755 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3756 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3757 | rbd_watch_errcb, rbd_dev); | |
3758 | if (IS_ERR(handle)) | |
3759 | return PTR_ERR(handle); | |
8eb87565 | 3760 | |
922dab61 | 3761 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3762 | return 0; |
b30a01f2 ID |
3763 | } |
3764 | ||
99d16943 ID |
3765 | /* |
3766 | * watch_mutex must be locked | |
3767 | */ | |
3768 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3769 | { |
922dab61 ID |
3770 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3771 | int ret; | |
b30a01f2 | 3772 | |
99d16943 ID |
3773 | rbd_assert(rbd_dev->watch_handle); |
3774 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3775 | |
922dab61 ID |
3776 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3777 | if (ret) | |
3778 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3779 | |
922dab61 | 3780 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3781 | } |
3782 | ||
99d16943 ID |
3783 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3784 | { | |
3785 | int ret; | |
3786 | ||
3787 | mutex_lock(&rbd_dev->watch_mutex); | |
3788 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3789 | ret = __rbd_register_watch(rbd_dev); | |
3790 | if (ret) | |
3791 | goto out; | |
3792 | ||
3793 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3794 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3795 | ||
3796 | out: | |
3797 | mutex_unlock(&rbd_dev->watch_mutex); | |
3798 | return ret; | |
3799 | } | |
3800 | ||
3801 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3802 | { |
99d16943 ID |
3803 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3804 | ||
3805 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
ed95b21a ID |
3806 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3807 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3808 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3809 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3810 | } |
3811 | ||
3812 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3813 | { | |
ed95b21a | 3814 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3815 | cancel_tasks_sync(rbd_dev); |
3816 | ||
3817 | mutex_lock(&rbd_dev->watch_mutex); | |
3818 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3819 | __rbd_unregister_watch(rbd_dev); | |
3820 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3821 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3822 | |
811c6688 | 3823 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3824 | } |
3825 | ||
14bb211d ID |
3826 | /* |
3827 | * lock_rwsem must be held for write | |
3828 | */ | |
3829 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3830 | { | |
3831 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3832 | char cookie[32]; | |
3833 | int ret; | |
3834 | ||
3835 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3836 | ||
3837 | format_lock_cookie(rbd_dev, cookie); | |
3838 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3839 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3840 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3841 | RBD_LOCK_TAG, cookie); | |
3842 | if (ret) { | |
3843 | if (ret != -EOPNOTSUPP) | |
3844 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3845 | ret); | |
3846 | ||
3847 | /* | |
3848 | * Lock cookie cannot be updated on older OSDs, so do | |
3849 | * a manual release and queue an acquire. | |
3850 | */ | |
3851 | if (rbd_release_lock(rbd_dev)) | |
3852 | queue_delayed_work(rbd_dev->task_wq, | |
3853 | &rbd_dev->lock_dwork, 0); | |
3854 | } else { | |
edd8ca80 | 3855 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3856 | } |
3857 | } | |
3858 | ||
99d16943 ID |
3859 | static void rbd_reregister_watch(struct work_struct *work) |
3860 | { | |
3861 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3862 | struct rbd_device, watch_dwork); | |
3863 | int ret; | |
3864 | ||
3865 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3866 | ||
3867 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3868 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3869 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3870 | return; |
87c0fded | 3871 | } |
99d16943 ID |
3872 | |
3873 | ret = __rbd_register_watch(rbd_dev); | |
3874 | if (ret) { | |
3875 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3876 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3877 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3878 | wake_requests(rbd_dev, true); |
87c0fded | 3879 | } else { |
99d16943 ID |
3880 | queue_delayed_work(rbd_dev->task_wq, |
3881 | &rbd_dev->watch_dwork, | |
3882 | RBD_RETRY_DELAY); | |
87c0fded ID |
3883 | } |
3884 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3885 | return; |
99d16943 ID |
3886 | } |
3887 | ||
3888 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3889 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3890 | mutex_unlock(&rbd_dev->watch_mutex); | |
3891 | ||
14bb211d ID |
3892 | down_write(&rbd_dev->lock_rwsem); |
3893 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3894 | rbd_reacquire_lock(rbd_dev); | |
3895 | up_write(&rbd_dev->lock_rwsem); | |
3896 | ||
99d16943 ID |
3897 | ret = rbd_dev_refresh(rbd_dev); |
3898 | if (ret) | |
3899 | rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); | |
99d16943 ID |
3900 | } |
3901 | ||
36be9a76 | 3902 | /* |
f40eb349 AE |
3903 | * Synchronous osd object method call. Returns the number of bytes |
3904 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3905 | */ |
3906 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3907 | struct ceph_object_id *oid, |
3908 | struct ceph_object_locator *oloc, | |
36be9a76 | 3909 | const char *method_name, |
4157976b | 3910 | const void *outbound, |
36be9a76 | 3911 | size_t outbound_size, |
4157976b | 3912 | void *inbound, |
e2a58ee5 | 3913 | size_t inbound_size) |
36be9a76 | 3914 | { |
ecd4a68a ID |
3915 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3916 | struct page *req_page = NULL; | |
3917 | struct page *reply_page; | |
36be9a76 AE |
3918 | int ret; |
3919 | ||
3920 | /* | |
6010a451 AE |
3921 | * Method calls are ultimately read operations. The result |
3922 | * should placed into the inbound buffer provided. They | |
3923 | * also supply outbound data--parameters for the object | |
3924 | * method. Currently if this is present it will be a | |
3925 | * snapshot id. | |
36be9a76 | 3926 | */ |
ecd4a68a ID |
3927 | if (outbound) { |
3928 | if (outbound_size > PAGE_SIZE) | |
3929 | return -E2BIG; | |
36be9a76 | 3930 | |
ecd4a68a ID |
3931 | req_page = alloc_page(GFP_KERNEL); |
3932 | if (!req_page) | |
3933 | return -ENOMEM; | |
04017e29 | 3934 | |
ecd4a68a | 3935 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3936 | } |
36be9a76 | 3937 | |
ecd4a68a ID |
3938 | reply_page = alloc_page(GFP_KERNEL); |
3939 | if (!reply_page) { | |
3940 | if (req_page) | |
3941 | __free_page(req_page); | |
3942 | return -ENOMEM; | |
3943 | } | |
57385b51 | 3944 | |
ecd4a68a ID |
3945 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3946 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3947 | reply_page, &inbound_size); | |
3948 | if (!ret) { | |
3949 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3950 | ret = inbound_size; | |
3951 | } | |
36be9a76 | 3952 | |
ecd4a68a ID |
3953 | if (req_page) |
3954 | __free_page(req_page); | |
3955 | __free_page(reply_page); | |
36be9a76 AE |
3956 | return ret; |
3957 | } | |
3958 | ||
ed95b21a ID |
3959 | /* |
3960 | * lock_rwsem must be held for read | |
3961 | */ | |
3962 | static void rbd_wait_state_locked(struct rbd_device *rbd_dev) | |
3963 | { | |
3964 | DEFINE_WAIT(wait); | |
3965 | ||
3966 | do { | |
3967 | /* | |
3968 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3969 | * and cancel_delayed_work() in wake_requests(). | |
3970 | */ | |
3971 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3972 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3973 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3974 | TASK_UNINTERRUPTIBLE); | |
3975 | up_read(&rbd_dev->lock_rwsem); | |
3976 | schedule(); | |
3977 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded ID |
3978 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
3979 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)); | |
3980 | ||
ed95b21a ID |
3981 | finish_wait(&rbd_dev->lock_waitq, &wait); |
3982 | } | |
3983 | ||
7ad18afa | 3984 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3985 | { |
7ad18afa CH |
3986 | struct request *rq = blk_mq_rq_from_pdu(work); |
3987 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3988 | struct rbd_img_request *img_request; |
4e752f0a | 3989 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3990 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3991 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3992 | enum obj_operation_type op_type; |
4e752f0a | 3993 | u64 mapping_size; |
80de1912 | 3994 | bool must_be_locked; |
bf0d5f50 AE |
3995 | int result; |
3996 | ||
aebf526b CH |
3997 | switch (req_op(rq)) { |
3998 | case REQ_OP_DISCARD: | |
6ac56951 | 3999 | case REQ_OP_WRITE_ZEROES: |
90e98c52 | 4000 | op_type = OBJ_OP_DISCARD; |
aebf526b CH |
4001 | break; |
4002 | case REQ_OP_WRITE: | |
6d2940c8 | 4003 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
4004 | break; |
4005 | case REQ_OP_READ: | |
6d2940c8 | 4006 | op_type = OBJ_OP_READ; |
aebf526b CH |
4007 | break; |
4008 | default: | |
4009 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
4010 | result = -EIO; | |
4011 | goto err; | |
4012 | } | |
6d2940c8 | 4013 | |
bc1ecc65 | 4014 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 4015 | |
bc1ecc65 ID |
4016 | if (!length) { |
4017 | dout("%s: zero-length request\n", __func__); | |
4018 | result = 0; | |
4019 | goto err_rq; | |
4020 | } | |
bf0d5f50 | 4021 | |
9568c93e ID |
4022 | rbd_assert(op_type == OBJ_OP_READ || |
4023 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 4024 | |
bc1ecc65 ID |
4025 | /* |
4026 | * Quit early if the mapped snapshot no longer exists. It's | |
4027 | * still possible the snapshot will have disappeared by the | |
4028 | * time our request arrives at the osd, but there's no sense in | |
4029 | * sending it if we already know. | |
4030 | */ | |
4031 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
4032 | dout("request for non-existent snapshot"); | |
4033 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
4034 | result = -ENXIO; | |
4035 | goto err_rq; | |
4036 | } | |
4dda41d3 | 4037 | |
bc1ecc65 ID |
4038 | if (offset && length > U64_MAX - offset + 1) { |
4039 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
4040 | length); | |
4041 | result = -EINVAL; | |
4042 | goto err_rq; /* Shouldn't happen */ | |
4043 | } | |
4dda41d3 | 4044 | |
7ad18afa CH |
4045 | blk_mq_start_request(rq); |
4046 | ||
4e752f0a JD |
4047 | down_read(&rbd_dev->header_rwsem); |
4048 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 4049 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
4050 | snapc = rbd_dev->header.snapc; |
4051 | ceph_get_snap_context(snapc); | |
4052 | } | |
4053 | up_read(&rbd_dev->header_rwsem); | |
4054 | ||
4055 | if (offset + length > mapping_size) { | |
bc1ecc65 | 4056 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 4057 | length, mapping_size); |
bc1ecc65 ID |
4058 | result = -EIO; |
4059 | goto err_rq; | |
4060 | } | |
bf0d5f50 | 4061 | |
f9bebd58 ID |
4062 | must_be_locked = |
4063 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
4064 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
4065 | if (must_be_locked) { |
4066 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded | 4067 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
e010dd0a ID |
4068 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
4069 | if (rbd_dev->opts->exclusive) { | |
4070 | rbd_warn(rbd_dev, "exclusive lock required"); | |
4071 | result = -EROFS; | |
4072 | goto err_unlock; | |
4073 | } | |
ed95b21a | 4074 | rbd_wait_state_locked(rbd_dev); |
e010dd0a | 4075 | } |
87c0fded ID |
4076 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
4077 | result = -EBLACKLISTED; | |
4078 | goto err_unlock; | |
4079 | } | |
ed95b21a ID |
4080 | } |
4081 | ||
6d2940c8 | 4082 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
4e752f0a | 4083 | snapc); |
bc1ecc65 ID |
4084 | if (!img_request) { |
4085 | result = -ENOMEM; | |
ed95b21a | 4086 | goto err_unlock; |
bc1ecc65 ID |
4087 | } |
4088 | img_request->rq = rq; | |
70b16db8 | 4089 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 4090 | |
90e98c52 GZ |
4091 | if (op_type == OBJ_OP_DISCARD) |
4092 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, | |
4093 | NULL); | |
4094 | else | |
4095 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
4096 | rq->bio); | |
bc1ecc65 ID |
4097 | if (result) |
4098 | goto err_img_request; | |
bf0d5f50 | 4099 | |
bc1ecc65 ID |
4100 | result = rbd_img_request_submit(img_request); |
4101 | if (result) | |
4102 | goto err_img_request; | |
bf0d5f50 | 4103 | |
ed95b21a ID |
4104 | if (must_be_locked) |
4105 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 4106 | return; |
bf0d5f50 | 4107 | |
bc1ecc65 ID |
4108 | err_img_request: |
4109 | rbd_img_request_put(img_request); | |
ed95b21a ID |
4110 | err_unlock: |
4111 | if (must_be_locked) | |
4112 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
4113 | err_rq: |
4114 | if (result) | |
4115 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 4116 | obj_op_name(op_type), length, offset, result); |
e96a650a | 4117 | ceph_put_snap_context(snapc); |
7ad18afa | 4118 | err: |
2a842aca | 4119 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 4120 | } |
bf0d5f50 | 4121 | |
fc17b653 | 4122 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 4123 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 4124 | { |
7ad18afa CH |
4125 | struct request *rq = bd->rq; |
4126 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 4127 | |
7ad18afa | 4128 | queue_work(rbd_wq, work); |
fc17b653 | 4129 | return BLK_STS_OK; |
bf0d5f50 AE |
4130 | } |
4131 | ||
602adf40 YS |
4132 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
4133 | { | |
5769ed0c ID |
4134 | blk_cleanup_queue(rbd_dev->disk->queue); |
4135 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
4136 | put_disk(rbd_dev->disk); | |
a0cab924 | 4137 | rbd_dev->disk = NULL; |
602adf40 YS |
4138 | } |
4139 | ||
788e2df3 | 4140 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
4141 | struct ceph_object_id *oid, |
4142 | struct ceph_object_locator *oloc, | |
4143 | void *buf, int buf_len) | |
788e2df3 AE |
4144 | |
4145 | { | |
fe5478e0 ID |
4146 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4147 | struct ceph_osd_request *req; | |
4148 | struct page **pages; | |
4149 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
4150 | int ret; |
4151 | ||
fe5478e0 ID |
4152 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
4153 | if (!req) | |
4154 | return -ENOMEM; | |
788e2df3 | 4155 | |
fe5478e0 ID |
4156 | ceph_oid_copy(&req->r_base_oid, oid); |
4157 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
4158 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 4159 | |
fe5478e0 | 4160 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
788e2df3 | 4161 | if (ret) |
fe5478e0 | 4162 | goto out_req; |
788e2df3 | 4163 | |
fe5478e0 ID |
4164 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
4165 | if (IS_ERR(pages)) { | |
4166 | ret = PTR_ERR(pages); | |
4167 | goto out_req; | |
4168 | } | |
1ceae7ef | 4169 | |
fe5478e0 ID |
4170 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
4171 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
4172 | true); | |
4173 | ||
4174 | ceph_osdc_start_request(osdc, req, false); | |
4175 | ret = ceph_osdc_wait_request(osdc, req); | |
4176 | if (ret >= 0) | |
4177 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 4178 | |
fe5478e0 ID |
4179 | out_req: |
4180 | ceph_osdc_put_request(req); | |
788e2df3 AE |
4181 | return ret; |
4182 | } | |
4183 | ||
602adf40 | 4184 | /* |
662518b1 AE |
4185 | * Read the complete header for the given rbd device. On successful |
4186 | * return, the rbd_dev->header field will contain up-to-date | |
4187 | * information about the image. | |
602adf40 | 4188 | */ |
99a41ebc | 4189 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 4190 | { |
4156d998 | 4191 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 4192 | u32 snap_count = 0; |
4156d998 AE |
4193 | u64 names_size = 0; |
4194 | u32 want_count; | |
4195 | int ret; | |
602adf40 | 4196 | |
00f1f36f | 4197 | /* |
4156d998 AE |
4198 | * The complete header will include an array of its 64-bit |
4199 | * snapshot ids, followed by the names of those snapshots as | |
4200 | * a contiguous block of NUL-terminated strings. Note that | |
4201 | * the number of snapshots could change by the time we read | |
4202 | * it in, in which case we re-read it. | |
00f1f36f | 4203 | */ |
4156d998 AE |
4204 | do { |
4205 | size_t size; | |
4206 | ||
4207 | kfree(ondisk); | |
4208 | ||
4209 | size = sizeof (*ondisk); | |
4210 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
4211 | size += names_size; | |
4212 | ondisk = kmalloc(size, GFP_KERNEL); | |
4213 | if (!ondisk) | |
662518b1 | 4214 | return -ENOMEM; |
4156d998 | 4215 | |
fe5478e0 ID |
4216 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
4217 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 4218 | if (ret < 0) |
662518b1 | 4219 | goto out; |
c0cd10db | 4220 | if ((size_t)ret < size) { |
4156d998 | 4221 | ret = -ENXIO; |
06ecc6cb AE |
4222 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
4223 | size, ret); | |
662518b1 | 4224 | goto out; |
4156d998 AE |
4225 | } |
4226 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
4227 | ret = -ENXIO; | |
06ecc6cb | 4228 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 4229 | goto out; |
81e759fb | 4230 | } |
602adf40 | 4231 | |
4156d998 AE |
4232 | names_size = le64_to_cpu(ondisk->snap_names_len); |
4233 | want_count = snap_count; | |
4234 | snap_count = le32_to_cpu(ondisk->snap_count); | |
4235 | } while (snap_count != want_count); | |
00f1f36f | 4236 | |
662518b1 AE |
4237 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
4238 | out: | |
4156d998 AE |
4239 | kfree(ondisk); |
4240 | ||
4241 | return ret; | |
602adf40 YS |
4242 | } |
4243 | ||
15228ede AE |
4244 | /* |
4245 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
4246 | * has disappeared from the (just updated) snapshot context. | |
4247 | */ | |
4248 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
4249 | { | |
4250 | u64 snap_id; | |
4251 | ||
4252 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
4253 | return; | |
4254 | ||
4255 | snap_id = rbd_dev->spec->snap_id; | |
4256 | if (snap_id == CEPH_NOSNAP) | |
4257 | return; | |
4258 | ||
4259 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
4260 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
4261 | } | |
4262 | ||
9875201e JD |
4263 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
4264 | { | |
4265 | sector_t size; | |
9875201e JD |
4266 | |
4267 | /* | |
811c6688 ID |
4268 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
4269 | * try to update its size. If REMOVING is set, updating size | |
4270 | * is just useless work since the device can't be opened. | |
9875201e | 4271 | */ |
811c6688 ID |
4272 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
4273 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
4274 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
4275 | dout("setting size to %llu sectors", (unsigned long long)size); | |
4276 | set_capacity(rbd_dev->disk, size); | |
4277 | revalidate_disk(rbd_dev->disk); | |
4278 | } | |
4279 | } | |
4280 | ||
cc4a38bd | 4281 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 4282 | { |
e627db08 | 4283 | u64 mapping_size; |
1fe5e993 AE |
4284 | int ret; |
4285 | ||
cfbf6377 | 4286 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 4287 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
4288 | |
4289 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 4290 | if (ret) |
73e39e4d | 4291 | goto out; |
15228ede | 4292 | |
e8f59b59 ID |
4293 | /* |
4294 | * If there is a parent, see if it has disappeared due to the | |
4295 | * mapped image getting flattened. | |
4296 | */ | |
4297 | if (rbd_dev->parent) { | |
4298 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4299 | if (ret) | |
73e39e4d | 4300 | goto out; |
e8f59b59 ID |
4301 | } |
4302 | ||
5ff1108c | 4303 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 4304 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
4305 | } else { |
4306 | /* validate mapped snapshot's EXISTS flag */ | |
4307 | rbd_exists_validate(rbd_dev); | |
4308 | } | |
15228ede | 4309 | |
73e39e4d | 4310 | out: |
cfbf6377 | 4311 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 4312 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 4313 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 4314 | |
73e39e4d | 4315 | return ret; |
1fe5e993 AE |
4316 | } |
4317 | ||
d6296d39 CH |
4318 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
4319 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
4320 | { |
4321 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
4322 | ||
4323 | INIT_WORK(work, rbd_queue_workfn); | |
4324 | return 0; | |
4325 | } | |
4326 | ||
f363b089 | 4327 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 4328 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
4329 | .init_request = rbd_init_request, |
4330 | }; | |
4331 | ||
602adf40 YS |
4332 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
4333 | { | |
4334 | struct gendisk *disk; | |
4335 | struct request_queue *q; | |
593a9e7b | 4336 | u64 segment_size; |
7ad18afa | 4337 | int err; |
602adf40 | 4338 | |
602adf40 | 4339 | /* create gendisk info */ |
7e513d43 ID |
4340 | disk = alloc_disk(single_major ? |
4341 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
4342 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 4343 | if (!disk) |
1fcdb8aa | 4344 | return -ENOMEM; |
602adf40 | 4345 | |
f0f8cef5 | 4346 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 4347 | rbd_dev->dev_id); |
602adf40 | 4348 | disk->major = rbd_dev->major; |
dd82fff1 | 4349 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
4350 | if (single_major) |
4351 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
4352 | disk->fops = &rbd_bd_ops; |
4353 | disk->private_data = rbd_dev; | |
4354 | ||
7ad18afa CH |
4355 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
4356 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 4357 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 4358 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 4359 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
4360 | rbd_dev->tag_set.nr_hw_queues = 1; |
4361 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
4362 | ||
4363 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
4364 | if (err) | |
602adf40 | 4365 | goto out_disk; |
029bcbd8 | 4366 | |
7ad18afa CH |
4367 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
4368 | if (IS_ERR(q)) { | |
4369 | err = PTR_ERR(q); | |
4370 | goto out_tag_set; | |
4371 | } | |
4372 | ||
d8a2c89c ID |
4373 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
4374 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ | |
593a9e7b | 4375 | |
029bcbd8 | 4376 | /* set io sizes to object size */ |
593a9e7b AE |
4377 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
4378 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
0d9fde4f | 4379 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 4380 | blk_queue_max_segments(q, USHRT_MAX); |
593a9e7b AE |
4381 | blk_queue_max_segment_size(q, segment_size); |
4382 | blk_queue_io_min(q, segment_size); | |
4383 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 4384 | |
90e98c52 GZ |
4385 | /* enable the discard support */ |
4386 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
4387 | q->limits.discard_granularity = segment_size; | |
2bb4cd5c | 4388 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
6ac56951 | 4389 | blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE); |
90e98c52 | 4390 | |
bae818ee | 4391 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 4392 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 4393 | |
5769ed0c ID |
4394 | /* |
4395 | * disk_release() expects a queue ref from add_disk() and will | |
4396 | * put it. Hold an extra ref until add_disk() is called. | |
4397 | */ | |
4398 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 4399 | disk->queue = q; |
602adf40 YS |
4400 | q->queuedata = rbd_dev; |
4401 | ||
4402 | rbd_dev->disk = disk; | |
602adf40 | 4403 | |
602adf40 | 4404 | return 0; |
7ad18afa CH |
4405 | out_tag_set: |
4406 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
4407 | out_disk: |
4408 | put_disk(disk); | |
7ad18afa | 4409 | return err; |
602adf40 YS |
4410 | } |
4411 | ||
dfc5606d YS |
4412 | /* |
4413 | sysfs | |
4414 | */ | |
4415 | ||
593a9e7b AE |
4416 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
4417 | { | |
4418 | return container_of(dev, struct rbd_device, dev); | |
4419 | } | |
4420 | ||
dfc5606d YS |
4421 | static ssize_t rbd_size_show(struct device *dev, |
4422 | struct device_attribute *attr, char *buf) | |
4423 | { | |
593a9e7b | 4424 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 4425 | |
fc71d833 AE |
4426 | return sprintf(buf, "%llu\n", |
4427 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
4428 | } |
4429 | ||
34b13184 AE |
4430 | /* |
4431 | * Note this shows the features for whatever's mapped, which is not | |
4432 | * necessarily the base image. | |
4433 | */ | |
4434 | static ssize_t rbd_features_show(struct device *dev, | |
4435 | struct device_attribute *attr, char *buf) | |
4436 | { | |
4437 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4438 | ||
4439 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4440 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4441 | } |
4442 | ||
dfc5606d YS |
4443 | static ssize_t rbd_major_show(struct device *dev, |
4444 | struct device_attribute *attr, char *buf) | |
4445 | { | |
593a9e7b | 4446 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4447 | |
fc71d833 AE |
4448 | if (rbd_dev->major) |
4449 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4450 | ||
4451 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4452 | } |
4453 | ||
4454 | static ssize_t rbd_minor_show(struct device *dev, | |
4455 | struct device_attribute *attr, char *buf) | |
4456 | { | |
4457 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4458 | |
dd82fff1 | 4459 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4460 | } |
4461 | ||
005a07bf ID |
4462 | static ssize_t rbd_client_addr_show(struct device *dev, |
4463 | struct device_attribute *attr, char *buf) | |
4464 | { | |
4465 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4466 | struct ceph_entity_addr *client_addr = | |
4467 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4468 | ||
4469 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4470 | le32_to_cpu(client_addr->nonce)); | |
4471 | } | |
4472 | ||
dfc5606d YS |
4473 | static ssize_t rbd_client_id_show(struct device *dev, |
4474 | struct device_attribute *attr, char *buf) | |
602adf40 | 4475 | { |
593a9e7b | 4476 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4477 | |
1dbb4399 | 4478 | return sprintf(buf, "client%lld\n", |
033268a5 | 4479 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4480 | } |
4481 | ||
267fb90b MC |
4482 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4483 | struct device_attribute *attr, char *buf) | |
4484 | { | |
4485 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4486 | ||
4487 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4488 | } | |
4489 | ||
0d6d1e9c MC |
4490 | static ssize_t rbd_config_info_show(struct device *dev, |
4491 | struct device_attribute *attr, char *buf) | |
4492 | { | |
4493 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4494 | ||
4495 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4496 | } |
4497 | ||
dfc5606d YS |
4498 | static ssize_t rbd_pool_show(struct device *dev, |
4499 | struct device_attribute *attr, char *buf) | |
602adf40 | 4500 | { |
593a9e7b | 4501 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4502 | |
0d7dbfce | 4503 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4504 | } |
4505 | ||
9bb2f334 AE |
4506 | static ssize_t rbd_pool_id_show(struct device *dev, |
4507 | struct device_attribute *attr, char *buf) | |
4508 | { | |
4509 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4510 | ||
0d7dbfce | 4511 | return sprintf(buf, "%llu\n", |
fc71d833 | 4512 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4513 | } |
4514 | ||
dfc5606d YS |
4515 | static ssize_t rbd_name_show(struct device *dev, |
4516 | struct device_attribute *attr, char *buf) | |
4517 | { | |
593a9e7b | 4518 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4519 | |
a92ffdf8 AE |
4520 | if (rbd_dev->spec->image_name) |
4521 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4522 | ||
4523 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4524 | } |
4525 | ||
589d30e0 AE |
4526 | static ssize_t rbd_image_id_show(struct device *dev, |
4527 | struct device_attribute *attr, char *buf) | |
4528 | { | |
4529 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4530 | ||
0d7dbfce | 4531 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4532 | } |
4533 | ||
34b13184 AE |
4534 | /* |
4535 | * Shows the name of the currently-mapped snapshot (or | |
4536 | * RBD_SNAP_HEAD_NAME for the base image). | |
4537 | */ | |
dfc5606d YS |
4538 | static ssize_t rbd_snap_show(struct device *dev, |
4539 | struct device_attribute *attr, | |
4540 | char *buf) | |
4541 | { | |
593a9e7b | 4542 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4543 | |
0d7dbfce | 4544 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4545 | } |
4546 | ||
92a58671 MC |
4547 | static ssize_t rbd_snap_id_show(struct device *dev, |
4548 | struct device_attribute *attr, char *buf) | |
4549 | { | |
4550 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4551 | ||
4552 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4553 | } | |
4554 | ||
86b00e0d | 4555 | /* |
ff96128f ID |
4556 | * For a v2 image, shows the chain of parent images, separated by empty |
4557 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4558 | * image)". | |
86b00e0d AE |
4559 | */ |
4560 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4561 | struct device_attribute *attr, |
4562 | char *buf) | |
86b00e0d AE |
4563 | { |
4564 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4565 | ssize_t count = 0; |
86b00e0d | 4566 | |
ff96128f | 4567 | if (!rbd_dev->parent) |
86b00e0d AE |
4568 | return sprintf(buf, "(no parent image)\n"); |
4569 | ||
ff96128f ID |
4570 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4571 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4572 | ||
4573 | count += sprintf(&buf[count], "%s" | |
4574 | "pool_id %llu\npool_name %s\n" | |
4575 | "image_id %s\nimage_name %s\n" | |
4576 | "snap_id %llu\nsnap_name %s\n" | |
4577 | "overlap %llu\n", | |
4578 | !count ? "" : "\n", /* first? */ | |
4579 | spec->pool_id, spec->pool_name, | |
4580 | spec->image_id, spec->image_name ?: "(unknown)", | |
4581 | spec->snap_id, spec->snap_name, | |
4582 | rbd_dev->parent_overlap); | |
4583 | } | |
4584 | ||
4585 | return count; | |
86b00e0d AE |
4586 | } |
4587 | ||
dfc5606d YS |
4588 | static ssize_t rbd_image_refresh(struct device *dev, |
4589 | struct device_attribute *attr, | |
4590 | const char *buf, | |
4591 | size_t size) | |
4592 | { | |
593a9e7b | 4593 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4594 | int ret; |
602adf40 | 4595 | |
cc4a38bd | 4596 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4597 | if (ret) |
52bb1f9b | 4598 | return ret; |
b813623a | 4599 | |
52bb1f9b | 4600 | return size; |
dfc5606d | 4601 | } |
602adf40 | 4602 | |
dfc5606d | 4603 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 4604 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 4605 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 4606 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
005a07bf | 4607 | static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
dfc5606d | 4608 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
267fb90b | 4609 | static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
0d6d1e9c | 4610 | static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL); |
dfc5606d | 4611 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
9bb2f334 | 4612 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 4613 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 4614 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
4615 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
4616 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
92a58671 | 4617 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
86b00e0d | 4618 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
4619 | |
4620 | static struct attribute *rbd_attrs[] = { | |
4621 | &dev_attr_size.attr, | |
34b13184 | 4622 | &dev_attr_features.attr, |
dfc5606d | 4623 | &dev_attr_major.attr, |
dd82fff1 | 4624 | &dev_attr_minor.attr, |
005a07bf | 4625 | &dev_attr_client_addr.attr, |
dfc5606d | 4626 | &dev_attr_client_id.attr, |
267fb90b | 4627 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4628 | &dev_attr_config_info.attr, |
dfc5606d | 4629 | &dev_attr_pool.attr, |
9bb2f334 | 4630 | &dev_attr_pool_id.attr, |
dfc5606d | 4631 | &dev_attr_name.attr, |
589d30e0 | 4632 | &dev_attr_image_id.attr, |
dfc5606d | 4633 | &dev_attr_current_snap.attr, |
92a58671 | 4634 | &dev_attr_snap_id.attr, |
86b00e0d | 4635 | &dev_attr_parent.attr, |
dfc5606d | 4636 | &dev_attr_refresh.attr, |
dfc5606d YS |
4637 | NULL |
4638 | }; | |
4639 | ||
4640 | static struct attribute_group rbd_attr_group = { | |
4641 | .attrs = rbd_attrs, | |
4642 | }; | |
4643 | ||
4644 | static const struct attribute_group *rbd_attr_groups[] = { | |
4645 | &rbd_attr_group, | |
4646 | NULL | |
4647 | }; | |
4648 | ||
6cac4695 | 4649 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4650 | |
b9942bc9 | 4651 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4652 | .name = "rbd", |
4653 | .groups = rbd_attr_groups, | |
6cac4695 | 4654 | .release = rbd_dev_release, |
dfc5606d YS |
4655 | }; |
4656 | ||
8b8fb99c AE |
4657 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4658 | { | |
4659 | kref_get(&spec->kref); | |
4660 | ||
4661 | return spec; | |
4662 | } | |
4663 | ||
4664 | static void rbd_spec_free(struct kref *kref); | |
4665 | static void rbd_spec_put(struct rbd_spec *spec) | |
4666 | { | |
4667 | if (spec) | |
4668 | kref_put(&spec->kref, rbd_spec_free); | |
4669 | } | |
4670 | ||
4671 | static struct rbd_spec *rbd_spec_alloc(void) | |
4672 | { | |
4673 | struct rbd_spec *spec; | |
4674 | ||
4675 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4676 | if (!spec) | |
4677 | return NULL; | |
04077599 ID |
4678 | |
4679 | spec->pool_id = CEPH_NOPOOL; | |
4680 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4681 | kref_init(&spec->kref); |
4682 | ||
8b8fb99c AE |
4683 | return spec; |
4684 | } | |
4685 | ||
4686 | static void rbd_spec_free(struct kref *kref) | |
4687 | { | |
4688 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4689 | ||
4690 | kfree(spec->pool_name); | |
4691 | kfree(spec->image_id); | |
4692 | kfree(spec->image_name); | |
4693 | kfree(spec->snap_name); | |
4694 | kfree(spec); | |
4695 | } | |
4696 | ||
1643dfa4 | 4697 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4698 | { |
99d16943 | 4699 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4700 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4701 | |
c41d13a3 | 4702 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4703 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4704 | kfree(rbd_dev->config_info); |
c41d13a3 | 4705 | |
dd5ac32d ID |
4706 | rbd_put_client(rbd_dev->rbd_client); |
4707 | rbd_spec_put(rbd_dev->spec); | |
4708 | kfree(rbd_dev->opts); | |
4709 | kfree(rbd_dev); | |
1643dfa4 ID |
4710 | } |
4711 | ||
4712 | static void rbd_dev_release(struct device *dev) | |
4713 | { | |
4714 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4715 | bool need_put = !!rbd_dev->opts; | |
4716 | ||
4717 | if (need_put) { | |
4718 | destroy_workqueue(rbd_dev->task_wq); | |
4719 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4720 | } | |
4721 | ||
4722 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4723 | |
4724 | /* | |
4725 | * This is racy, but way better than putting module outside of | |
4726 | * the release callback. The race window is pretty small, so | |
4727 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4728 | */ | |
4729 | if (need_put) | |
4730 | module_put(THIS_MODULE); | |
4731 | } | |
4732 | ||
1643dfa4 ID |
4733 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4734 | struct rbd_spec *spec) | |
c53d5893 AE |
4735 | { |
4736 | struct rbd_device *rbd_dev; | |
4737 | ||
1643dfa4 | 4738 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4739 | if (!rbd_dev) |
4740 | return NULL; | |
4741 | ||
4742 | spin_lock_init(&rbd_dev->lock); | |
4743 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4744 | init_rwsem(&rbd_dev->header_rwsem); |
4745 | ||
7e97332e | 4746 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4747 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4748 | rbd_dev->header_oloc.pool = spec->pool_id; |
c41d13a3 | 4749 | |
99d16943 ID |
4750 | mutex_init(&rbd_dev->watch_mutex); |
4751 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4752 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4753 | ||
ed95b21a ID |
4754 | init_rwsem(&rbd_dev->lock_rwsem); |
4755 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4756 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4757 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4758 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4759 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4760 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4761 | ||
dd5ac32d ID |
4762 | rbd_dev->dev.bus = &rbd_bus_type; |
4763 | rbd_dev->dev.type = &rbd_device_type; | |
4764 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4765 | device_initialize(&rbd_dev->dev); |
4766 | ||
c53d5893 | 4767 | rbd_dev->rbd_client = rbdc; |
d147543d | 4768 | rbd_dev->spec = spec; |
0903e875 | 4769 | |
1643dfa4 ID |
4770 | return rbd_dev; |
4771 | } | |
4772 | ||
4773 | /* | |
4774 | * Create a mapping rbd_dev. | |
4775 | */ | |
4776 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4777 | struct rbd_spec *spec, | |
4778 | struct rbd_options *opts) | |
4779 | { | |
4780 | struct rbd_device *rbd_dev; | |
4781 | ||
4782 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4783 | if (!rbd_dev) | |
4784 | return NULL; | |
4785 | ||
4786 | rbd_dev->opts = opts; | |
4787 | ||
4788 | /* get an id and fill in device name */ | |
4789 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4790 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4791 | GFP_KERNEL); | |
4792 | if (rbd_dev->dev_id < 0) | |
4793 | goto fail_rbd_dev; | |
4794 | ||
4795 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4796 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4797 | rbd_dev->name); | |
4798 | if (!rbd_dev->task_wq) | |
4799 | goto fail_dev_id; | |
dd5ac32d | 4800 | |
1643dfa4 ID |
4801 | /* we have a ref from do_rbd_add() */ |
4802 | __module_get(THIS_MODULE); | |
dd5ac32d | 4803 | |
1643dfa4 | 4804 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4805 | return rbd_dev; |
1643dfa4 ID |
4806 | |
4807 | fail_dev_id: | |
4808 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4809 | fail_rbd_dev: | |
4810 | rbd_dev_free(rbd_dev); | |
4811 | return NULL; | |
c53d5893 AE |
4812 | } |
4813 | ||
4814 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4815 | { | |
dd5ac32d ID |
4816 | if (rbd_dev) |
4817 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4818 | } |
4819 | ||
9d475de5 AE |
4820 | /* |
4821 | * Get the size and object order for an image snapshot, or if | |
4822 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4823 | * image. | |
4824 | */ | |
4825 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4826 | u8 *order, u64 *snap_size) | |
4827 | { | |
4828 | __le64 snapid = cpu_to_le64(snap_id); | |
4829 | int ret; | |
4830 | struct { | |
4831 | u8 order; | |
4832 | __le64 size; | |
4833 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4834 | ||
ecd4a68a ID |
4835 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4836 | &rbd_dev->header_oloc, "get_size", | |
4837 | &snapid, sizeof(snapid), | |
4838 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4839 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4840 | if (ret < 0) |
4841 | return ret; | |
57385b51 AE |
4842 | if (ret < sizeof (size_buf)) |
4843 | return -ERANGE; | |
9d475de5 | 4844 | |
c3545579 | 4845 | if (order) { |
c86f86e9 | 4846 | *order = size_buf.order; |
c3545579 JD |
4847 | dout(" order %u", (unsigned int)*order); |
4848 | } | |
9d475de5 AE |
4849 | *snap_size = le64_to_cpu(size_buf.size); |
4850 | ||
c3545579 JD |
4851 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4852 | (unsigned long long)snap_id, | |
57385b51 | 4853 | (unsigned long long)*snap_size); |
9d475de5 AE |
4854 | |
4855 | return 0; | |
4856 | } | |
4857 | ||
4858 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4859 | { | |
4860 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4861 | &rbd_dev->header.obj_order, | |
4862 | &rbd_dev->header.image_size); | |
4863 | } | |
4864 | ||
1e130199 AE |
4865 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4866 | { | |
4867 | void *reply_buf; | |
4868 | int ret; | |
4869 | void *p; | |
4870 | ||
4871 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4872 | if (!reply_buf) | |
4873 | return -ENOMEM; | |
4874 | ||
ecd4a68a ID |
4875 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4876 | &rbd_dev->header_oloc, "get_object_prefix", | |
4877 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4878 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4879 | if (ret < 0) |
4880 | goto out; | |
4881 | ||
4882 | p = reply_buf; | |
4883 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4884 | p + ret, NULL, GFP_NOIO); |
4885 | ret = 0; | |
1e130199 AE |
4886 | |
4887 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4888 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4889 | rbd_dev->header.object_prefix = NULL; | |
4890 | } else { | |
4891 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4892 | } | |
1e130199 AE |
4893 | out: |
4894 | kfree(reply_buf); | |
4895 | ||
4896 | return ret; | |
4897 | } | |
4898 | ||
b1b5402a AE |
4899 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4900 | u64 *snap_features) | |
4901 | { | |
4902 | __le64 snapid = cpu_to_le64(snap_id); | |
4903 | struct { | |
4904 | __le64 features; | |
4905 | __le64 incompat; | |
4157976b | 4906 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4907 | u64 unsup; |
b1b5402a AE |
4908 | int ret; |
4909 | ||
ecd4a68a ID |
4910 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4911 | &rbd_dev->header_oloc, "get_features", | |
4912 | &snapid, sizeof(snapid), | |
4913 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4914 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4915 | if (ret < 0) |
4916 | return ret; | |
57385b51 AE |
4917 | if (ret < sizeof (features_buf)) |
4918 | return -ERANGE; | |
d889140c | 4919 | |
d3767f0f ID |
4920 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4921 | if (unsup) { | |
4922 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4923 | unsup); | |
b8f5c6ed | 4924 | return -ENXIO; |
d3767f0f | 4925 | } |
d889140c | 4926 | |
b1b5402a AE |
4927 | *snap_features = le64_to_cpu(features_buf.features); |
4928 | ||
4929 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4930 | (unsigned long long)snap_id, |
4931 | (unsigned long long)*snap_features, | |
4932 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4933 | |
4934 | return 0; | |
4935 | } | |
4936 | ||
4937 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4938 | { | |
4939 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4940 | &rbd_dev->header.features); | |
4941 | } | |
4942 | ||
86b00e0d AE |
4943 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4944 | { | |
4945 | struct rbd_spec *parent_spec; | |
4946 | size_t size; | |
4947 | void *reply_buf = NULL; | |
4948 | __le64 snapid; | |
4949 | void *p; | |
4950 | void *end; | |
642a2537 | 4951 | u64 pool_id; |
86b00e0d | 4952 | char *image_id; |
3b5cf2a2 | 4953 | u64 snap_id; |
86b00e0d | 4954 | u64 overlap; |
86b00e0d AE |
4955 | int ret; |
4956 | ||
4957 | parent_spec = rbd_spec_alloc(); | |
4958 | if (!parent_spec) | |
4959 | return -ENOMEM; | |
4960 | ||
4961 | size = sizeof (__le64) + /* pool_id */ | |
4962 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4963 | sizeof (__le64) + /* snap_id */ | |
4964 | sizeof (__le64); /* overlap */ | |
4965 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4966 | if (!reply_buf) { | |
4967 | ret = -ENOMEM; | |
4968 | goto out_err; | |
4969 | } | |
4970 | ||
4d9b67cd | 4971 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
ecd4a68a ID |
4972 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4973 | &rbd_dev->header_oloc, "get_parent", | |
4974 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4975 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4976 | if (ret < 0) |
4977 | goto out_err; | |
4978 | ||
86b00e0d | 4979 | p = reply_buf; |
57385b51 AE |
4980 | end = reply_buf + ret; |
4981 | ret = -ERANGE; | |
642a2537 | 4982 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4983 | if (pool_id == CEPH_NOPOOL) { |
4984 | /* | |
4985 | * Either the parent never existed, or we have | |
4986 | * record of it but the image got flattened so it no | |
4987 | * longer has a parent. When the parent of a | |
4988 | * layered image disappears we immediately set the | |
4989 | * overlap to 0. The effect of this is that all new | |
4990 | * requests will be treated as if the image had no | |
4991 | * parent. | |
4992 | */ | |
4993 | if (rbd_dev->parent_overlap) { | |
4994 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4995 | rbd_dev_parent_put(rbd_dev); |
4996 | pr_info("%s: clone image has been flattened\n", | |
4997 | rbd_dev->disk->disk_name); | |
4998 | } | |
4999 | ||
86b00e0d | 5000 | goto out; /* No parent? No problem. */ |
392a9dad | 5001 | } |
86b00e0d | 5002 | |
0903e875 AE |
5003 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5004 | ||
5005 | ret = -EIO; | |
642a2537 | 5006 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 5007 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 5008 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 5009 | goto out_err; |
c0cd10db | 5010 | } |
0903e875 | 5011 | |
979ed480 | 5012 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
5013 | if (IS_ERR(image_id)) { |
5014 | ret = PTR_ERR(image_id); | |
5015 | goto out_err; | |
5016 | } | |
3b5cf2a2 | 5017 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
5018 | ceph_decode_64_safe(&p, end, overlap, out_err); |
5019 | ||
3b5cf2a2 AE |
5020 | /* |
5021 | * The parent won't change (except when the clone is | |
5022 | * flattened, already handled that). So we only need to | |
5023 | * record the parent spec we have not already done so. | |
5024 | */ | |
5025 | if (!rbd_dev->parent_spec) { | |
5026 | parent_spec->pool_id = pool_id; | |
5027 | parent_spec->image_id = image_id; | |
5028 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
5029 | rbd_dev->parent_spec = parent_spec; |
5030 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
5031 | } else { |
5032 | kfree(image_id); | |
3b5cf2a2 AE |
5033 | } |
5034 | ||
5035 | /* | |
cf32bd9c ID |
5036 | * We always update the parent overlap. If it's zero we issue |
5037 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 5038 | */ |
3b5cf2a2 | 5039 | if (!overlap) { |
3b5cf2a2 | 5040 | if (parent_spec) { |
cf32bd9c ID |
5041 | /* refresh, careful to warn just once */ |
5042 | if (rbd_dev->parent_overlap) | |
5043 | rbd_warn(rbd_dev, | |
5044 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 5045 | } else { |
cf32bd9c ID |
5046 | /* initial probe */ |
5047 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 5048 | } |
70cf49cf | 5049 | } |
cf32bd9c ID |
5050 | rbd_dev->parent_overlap = overlap; |
5051 | ||
86b00e0d AE |
5052 | out: |
5053 | ret = 0; | |
5054 | out_err: | |
5055 | kfree(reply_buf); | |
5056 | rbd_spec_put(parent_spec); | |
5057 | ||
5058 | return ret; | |
5059 | } | |
5060 | ||
cc070d59 AE |
5061 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
5062 | { | |
5063 | struct { | |
5064 | __le64 stripe_unit; | |
5065 | __le64 stripe_count; | |
5066 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
5067 | size_t size = sizeof (striping_info_buf); | |
5068 | void *p; | |
5069 | u64 obj_size; | |
5070 | u64 stripe_unit; | |
5071 | u64 stripe_count; | |
5072 | int ret; | |
5073 | ||
ecd4a68a ID |
5074 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5075 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
5076 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
5077 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
5078 | if (ret < 0) | |
5079 | return ret; | |
5080 | if (ret < size) | |
5081 | return -ERANGE; | |
5082 | ||
5083 | /* | |
5084 | * We don't actually support the "fancy striping" feature | |
5085 | * (STRIPINGV2) yet, but if the striping sizes are the | |
5086 | * defaults the behavior is the same as before. So find | |
5087 | * out, and only fail if the image has non-default values. | |
5088 | */ | |
5089 | ret = -EINVAL; | |
5bc3fb17 | 5090 | obj_size = rbd_obj_bytes(&rbd_dev->header); |
cc070d59 AE |
5091 | p = &striping_info_buf; |
5092 | stripe_unit = ceph_decode_64(&p); | |
5093 | if (stripe_unit != obj_size) { | |
5094 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
5095 | "(got %llu want %llu)", | |
5096 | stripe_unit, obj_size); | |
5097 | return -EINVAL; | |
5098 | } | |
5099 | stripe_count = ceph_decode_64(&p); | |
5100 | if (stripe_count != 1) { | |
5101 | rbd_warn(rbd_dev, "unsupported stripe count " | |
5102 | "(got %llu want 1)", stripe_count); | |
5103 | return -EINVAL; | |
5104 | } | |
500d0c0f AE |
5105 | rbd_dev->header.stripe_unit = stripe_unit; |
5106 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
5107 | |
5108 | return 0; | |
5109 | } | |
5110 | ||
7e97332e ID |
5111 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
5112 | { | |
5113 | __le64 data_pool_id; | |
5114 | int ret; | |
5115 | ||
5116 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
5117 | &rbd_dev->header_oloc, "get_data_pool", | |
5118 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
5119 | if (ret < 0) | |
5120 | return ret; | |
5121 | if (ret < sizeof(data_pool_id)) | |
5122 | return -EBADMSG; | |
5123 | ||
5124 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
5125 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
5126 | return 0; | |
5127 | } | |
5128 | ||
9e15b77d AE |
5129 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
5130 | { | |
ecd4a68a | 5131 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
5132 | size_t image_id_size; |
5133 | char *image_id; | |
5134 | void *p; | |
5135 | void *end; | |
5136 | size_t size; | |
5137 | void *reply_buf = NULL; | |
5138 | size_t len = 0; | |
5139 | char *image_name = NULL; | |
5140 | int ret; | |
5141 | ||
5142 | rbd_assert(!rbd_dev->spec->image_name); | |
5143 | ||
69e7a02f AE |
5144 | len = strlen(rbd_dev->spec->image_id); |
5145 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
5146 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
5147 | if (!image_id) | |
5148 | return NULL; | |
5149 | ||
5150 | p = image_id; | |
4157976b | 5151 | end = image_id + image_id_size; |
57385b51 | 5152 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
5153 | |
5154 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
5155 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5156 | if (!reply_buf) | |
5157 | goto out; | |
5158 | ||
ecd4a68a ID |
5159 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
5160 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
5161 | "dir_get_name", image_id, image_id_size, | |
5162 | reply_buf, size); | |
9e15b77d AE |
5163 | if (ret < 0) |
5164 | goto out; | |
5165 | p = reply_buf; | |
f40eb349 AE |
5166 | end = reply_buf + ret; |
5167 | ||
9e15b77d AE |
5168 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
5169 | if (IS_ERR(image_name)) | |
5170 | image_name = NULL; | |
5171 | else | |
5172 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
5173 | out: | |
5174 | kfree(reply_buf); | |
5175 | kfree(image_id); | |
5176 | ||
5177 | return image_name; | |
5178 | } | |
5179 | ||
2ad3d716 AE |
5180 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
5181 | { | |
5182 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5183 | const char *snap_name; | |
5184 | u32 which = 0; | |
5185 | ||
5186 | /* Skip over names until we find the one we are looking for */ | |
5187 | ||
5188 | snap_name = rbd_dev->header.snap_names; | |
5189 | while (which < snapc->num_snaps) { | |
5190 | if (!strcmp(name, snap_name)) | |
5191 | return snapc->snaps[which]; | |
5192 | snap_name += strlen(snap_name) + 1; | |
5193 | which++; | |
5194 | } | |
5195 | return CEPH_NOSNAP; | |
5196 | } | |
5197 | ||
5198 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5199 | { | |
5200 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5201 | u32 which; | |
5202 | bool found = false; | |
5203 | u64 snap_id; | |
5204 | ||
5205 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
5206 | const char *snap_name; | |
5207 | ||
5208 | snap_id = snapc->snaps[which]; | |
5209 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
5210 | if (IS_ERR(snap_name)) { |
5211 | /* ignore no-longer existing snapshots */ | |
5212 | if (PTR_ERR(snap_name) == -ENOENT) | |
5213 | continue; | |
5214 | else | |
5215 | break; | |
5216 | } | |
2ad3d716 AE |
5217 | found = !strcmp(name, snap_name); |
5218 | kfree(snap_name); | |
5219 | } | |
5220 | return found ? snap_id : CEPH_NOSNAP; | |
5221 | } | |
5222 | ||
5223 | /* | |
5224 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
5225 | * no snapshot by that name is found, or if an error occurs. | |
5226 | */ | |
5227 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5228 | { | |
5229 | if (rbd_dev->image_format == 1) | |
5230 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
5231 | ||
5232 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
5233 | } | |
5234 | ||
9e15b77d | 5235 | /* |
04077599 ID |
5236 | * An image being mapped will have everything but the snap id. |
5237 | */ | |
5238 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
5239 | { | |
5240 | struct rbd_spec *spec = rbd_dev->spec; | |
5241 | ||
5242 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
5243 | rbd_assert(spec->image_id && spec->image_name); | |
5244 | rbd_assert(spec->snap_name); | |
5245 | ||
5246 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
5247 | u64 snap_id; | |
5248 | ||
5249 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
5250 | if (snap_id == CEPH_NOSNAP) | |
5251 | return -ENOENT; | |
5252 | ||
5253 | spec->snap_id = snap_id; | |
5254 | } else { | |
5255 | spec->snap_id = CEPH_NOSNAP; | |
5256 | } | |
5257 | ||
5258 | return 0; | |
5259 | } | |
5260 | ||
5261 | /* | |
5262 | * A parent image will have all ids but none of the names. | |
e1d4213f | 5263 | * |
04077599 ID |
5264 | * All names in an rbd spec are dynamically allocated. It's OK if we |
5265 | * can't figure out the name for an image id. | |
9e15b77d | 5266 | */ |
04077599 | 5267 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 5268 | { |
2e9f7f1c AE |
5269 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
5270 | struct rbd_spec *spec = rbd_dev->spec; | |
5271 | const char *pool_name; | |
5272 | const char *image_name; | |
5273 | const char *snap_name; | |
9e15b77d AE |
5274 | int ret; |
5275 | ||
04077599 ID |
5276 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
5277 | rbd_assert(spec->image_id); | |
5278 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 5279 | |
2e9f7f1c | 5280 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 5281 | |
2e9f7f1c AE |
5282 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
5283 | if (!pool_name) { | |
5284 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
5285 | return -EIO; |
5286 | } | |
2e9f7f1c AE |
5287 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
5288 | if (!pool_name) | |
9e15b77d AE |
5289 | return -ENOMEM; |
5290 | ||
5291 | /* Fetch the image name; tolerate failure here */ | |
5292 | ||
2e9f7f1c AE |
5293 | image_name = rbd_dev_image_name(rbd_dev); |
5294 | if (!image_name) | |
06ecc6cb | 5295 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 5296 | |
04077599 | 5297 | /* Fetch the snapshot name */ |
9e15b77d | 5298 | |
2e9f7f1c | 5299 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
5300 | if (IS_ERR(snap_name)) { |
5301 | ret = PTR_ERR(snap_name); | |
9e15b77d | 5302 | goto out_err; |
2e9f7f1c AE |
5303 | } |
5304 | ||
5305 | spec->pool_name = pool_name; | |
5306 | spec->image_name = image_name; | |
5307 | spec->snap_name = snap_name; | |
9e15b77d AE |
5308 | |
5309 | return 0; | |
04077599 | 5310 | |
9e15b77d | 5311 | out_err: |
2e9f7f1c AE |
5312 | kfree(image_name); |
5313 | kfree(pool_name); | |
9e15b77d AE |
5314 | return ret; |
5315 | } | |
5316 | ||
cc4a38bd | 5317 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
5318 | { |
5319 | size_t size; | |
5320 | int ret; | |
5321 | void *reply_buf; | |
5322 | void *p; | |
5323 | void *end; | |
5324 | u64 seq; | |
5325 | u32 snap_count; | |
5326 | struct ceph_snap_context *snapc; | |
5327 | u32 i; | |
5328 | ||
5329 | /* | |
5330 | * We'll need room for the seq value (maximum snapshot id), | |
5331 | * snapshot count, and array of that many snapshot ids. | |
5332 | * For now we have a fixed upper limit on the number we're | |
5333 | * prepared to receive. | |
5334 | */ | |
5335 | size = sizeof (__le64) + sizeof (__le32) + | |
5336 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
5337 | reply_buf = kzalloc(size, GFP_KERNEL); | |
5338 | if (!reply_buf) | |
5339 | return -ENOMEM; | |
5340 | ||
ecd4a68a ID |
5341 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5342 | &rbd_dev->header_oloc, "get_snapcontext", | |
5343 | NULL, 0, reply_buf, size); | |
36be9a76 | 5344 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
5345 | if (ret < 0) |
5346 | goto out; | |
5347 | ||
35d489f9 | 5348 | p = reply_buf; |
57385b51 AE |
5349 | end = reply_buf + ret; |
5350 | ret = -ERANGE; | |
35d489f9 AE |
5351 | ceph_decode_64_safe(&p, end, seq, out); |
5352 | ceph_decode_32_safe(&p, end, snap_count, out); | |
5353 | ||
5354 | /* | |
5355 | * Make sure the reported number of snapshot ids wouldn't go | |
5356 | * beyond the end of our buffer. But before checking that, | |
5357 | * make sure the computed size of the snapshot context we | |
5358 | * allocate is representable in a size_t. | |
5359 | */ | |
5360 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
5361 | / sizeof (u64)) { | |
5362 | ret = -EINVAL; | |
5363 | goto out; | |
5364 | } | |
5365 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
5366 | goto out; | |
468521c1 | 5367 | ret = 0; |
35d489f9 | 5368 | |
812164f8 | 5369 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
5370 | if (!snapc) { |
5371 | ret = -ENOMEM; | |
5372 | goto out; | |
5373 | } | |
35d489f9 | 5374 | snapc->seq = seq; |
35d489f9 AE |
5375 | for (i = 0; i < snap_count; i++) |
5376 | snapc->snaps[i] = ceph_decode_64(&p); | |
5377 | ||
49ece554 | 5378 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
5379 | rbd_dev->header.snapc = snapc; |
5380 | ||
5381 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 5382 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
5383 | out: |
5384 | kfree(reply_buf); | |
5385 | ||
57385b51 | 5386 | return ret; |
35d489f9 AE |
5387 | } |
5388 | ||
54cac61f AE |
5389 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
5390 | u64 snap_id) | |
b8b1e2db AE |
5391 | { |
5392 | size_t size; | |
5393 | void *reply_buf; | |
54cac61f | 5394 | __le64 snapid; |
b8b1e2db AE |
5395 | int ret; |
5396 | void *p; | |
5397 | void *end; | |
b8b1e2db AE |
5398 | char *snap_name; |
5399 | ||
5400 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
5401 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5402 | if (!reply_buf) | |
5403 | return ERR_PTR(-ENOMEM); | |
5404 | ||
54cac61f | 5405 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
5406 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5407 | &rbd_dev->header_oloc, "get_snapshot_name", | |
5408 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 5409 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
5410 | if (ret < 0) { |
5411 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 5412 | goto out; |
f40eb349 | 5413 | } |
b8b1e2db AE |
5414 | |
5415 | p = reply_buf; | |
f40eb349 | 5416 | end = reply_buf + ret; |
e5c35534 | 5417 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 5418 | if (IS_ERR(snap_name)) |
b8b1e2db | 5419 | goto out; |
b8b1e2db | 5420 | |
f40eb349 | 5421 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 5422 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
5423 | out: |
5424 | kfree(reply_buf); | |
5425 | ||
f40eb349 | 5426 | return snap_name; |
b8b1e2db AE |
5427 | } |
5428 | ||
2df3fac7 | 5429 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 5430 | { |
2df3fac7 | 5431 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 5432 | int ret; |
117973fb | 5433 | |
1617e40c JD |
5434 | ret = rbd_dev_v2_image_size(rbd_dev); |
5435 | if (ret) | |
cfbf6377 | 5436 | return ret; |
1617e40c | 5437 | |
2df3fac7 AE |
5438 | if (first_time) { |
5439 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5440 | if (ret) | |
cfbf6377 | 5441 | return ret; |
2df3fac7 AE |
5442 | } |
5443 | ||
cc4a38bd | 5444 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5445 | if (ret && first_time) { |
5446 | kfree(rbd_dev->header.object_prefix); | |
5447 | rbd_dev->header.object_prefix = NULL; | |
5448 | } | |
117973fb AE |
5449 | |
5450 | return ret; | |
5451 | } | |
5452 | ||
a720ae09 ID |
5453 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5454 | { | |
5455 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5456 | ||
5457 | if (rbd_dev->image_format == 1) | |
5458 | return rbd_dev_v1_header_info(rbd_dev); | |
5459 | ||
5460 | return rbd_dev_v2_header_info(rbd_dev); | |
5461 | } | |
5462 | ||
e28fff26 AE |
5463 | /* |
5464 | * Skips over white space at *buf, and updates *buf to point to the | |
5465 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5466 | * the token (string of non-white space characters) found. Note |
5467 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5468 | */ |
5469 | static inline size_t next_token(const char **buf) | |
5470 | { | |
5471 | /* | |
5472 | * These are the characters that produce nonzero for | |
5473 | * isspace() in the "C" and "POSIX" locales. | |
5474 | */ | |
5475 | const char *spaces = " \f\n\r\t\v"; | |
5476 | ||
5477 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5478 | ||
5479 | return strcspn(*buf, spaces); /* Return token length */ | |
5480 | } | |
5481 | ||
ea3352f4 AE |
5482 | /* |
5483 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5484 | * enough to hold a copy of it, and copies the token into the new | |
5485 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5486 | * that a duplicate buffer is created even for a zero-length token. | |
5487 | * | |
5488 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5489 | * pointer if memory for the duplicate was not available. If | |
5490 | * the lenp argument is a non-null pointer, the length of the token | |
5491 | * (not including the '\0') is returned in *lenp. | |
5492 | * | |
5493 | * If successful, the *buf pointer will be updated to point beyond | |
5494 | * the end of the found token. | |
5495 | * | |
5496 | * Note: uses GFP_KERNEL for allocation. | |
5497 | */ | |
5498 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5499 | { | |
5500 | char *dup; | |
5501 | size_t len; | |
5502 | ||
5503 | len = next_token(buf); | |
4caf35f9 | 5504 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5505 | if (!dup) |
5506 | return NULL; | |
ea3352f4 AE |
5507 | *(dup + len) = '\0'; |
5508 | *buf += len; | |
5509 | ||
5510 | if (lenp) | |
5511 | *lenp = len; | |
5512 | ||
5513 | return dup; | |
5514 | } | |
5515 | ||
a725f65e | 5516 | /* |
859c31df AE |
5517 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5518 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5519 | * and the data written is passed here via a NUL-terminated buffer. | |
5520 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5521 | * |
859c31df AE |
5522 | * The information extracted from these options is recorded in |
5523 | * the other parameters which return dynamically-allocated | |
5524 | * structures: | |
5525 | * ceph_opts | |
5526 | * The address of a pointer that will refer to a ceph options | |
5527 | * structure. Caller must release the returned pointer using | |
5528 | * ceph_destroy_options() when it is no longer needed. | |
5529 | * rbd_opts | |
5530 | * Address of an rbd options pointer. Fully initialized by | |
5531 | * this function; caller must release with kfree(). | |
5532 | * spec | |
5533 | * Address of an rbd image specification pointer. Fully | |
5534 | * initialized by this function based on parsed options. | |
5535 | * Caller must release with rbd_spec_put(). | |
5536 | * | |
5537 | * The options passed take this form: | |
5538 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5539 | * where: | |
5540 | * <mon_addrs> | |
5541 | * A comma-separated list of one or more monitor addresses. | |
5542 | * A monitor address is an ip address, optionally followed | |
5543 | * by a port number (separated by a colon). | |
5544 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5545 | * <options> | |
5546 | * A comma-separated list of ceph and/or rbd options. | |
5547 | * <pool_name> | |
5548 | * The name of the rados pool containing the rbd image. | |
5549 | * <image_name> | |
5550 | * The name of the image in that pool to map. | |
5551 | * <snap_id> | |
5552 | * An optional snapshot id. If provided, the mapping will | |
5553 | * present data from the image at the time that snapshot was | |
5554 | * created. The image head is used if no snapshot id is | |
5555 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5556 | */ |
859c31df | 5557 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5558 | struct ceph_options **ceph_opts, |
859c31df AE |
5559 | struct rbd_options **opts, |
5560 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5561 | { |
d22f76e7 | 5562 | size_t len; |
859c31df | 5563 | char *options; |
0ddebc0c | 5564 | const char *mon_addrs; |
ecb4dc22 | 5565 | char *snap_name; |
0ddebc0c | 5566 | size_t mon_addrs_size; |
859c31df | 5567 | struct rbd_spec *spec = NULL; |
4e9afeba | 5568 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5569 | struct ceph_options *copts; |
dc79b113 | 5570 | int ret; |
e28fff26 AE |
5571 | |
5572 | /* The first four tokens are required */ | |
5573 | ||
7ef3214a | 5574 | len = next_token(&buf); |
4fb5d671 AE |
5575 | if (!len) { |
5576 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5577 | return -EINVAL; | |
5578 | } | |
0ddebc0c | 5579 | mon_addrs = buf; |
f28e565a | 5580 | mon_addrs_size = len + 1; |
7ef3214a | 5581 | buf += len; |
a725f65e | 5582 | |
dc79b113 | 5583 | ret = -EINVAL; |
f28e565a AE |
5584 | options = dup_token(&buf, NULL); |
5585 | if (!options) | |
dc79b113 | 5586 | return -ENOMEM; |
4fb5d671 AE |
5587 | if (!*options) { |
5588 | rbd_warn(NULL, "no options provided"); | |
5589 | goto out_err; | |
5590 | } | |
e28fff26 | 5591 | |
859c31df AE |
5592 | spec = rbd_spec_alloc(); |
5593 | if (!spec) | |
f28e565a | 5594 | goto out_mem; |
859c31df AE |
5595 | |
5596 | spec->pool_name = dup_token(&buf, NULL); | |
5597 | if (!spec->pool_name) | |
5598 | goto out_mem; | |
4fb5d671 AE |
5599 | if (!*spec->pool_name) { |
5600 | rbd_warn(NULL, "no pool name provided"); | |
5601 | goto out_err; | |
5602 | } | |
e28fff26 | 5603 | |
69e7a02f | 5604 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 5605 | if (!spec->image_name) |
f28e565a | 5606 | goto out_mem; |
4fb5d671 AE |
5607 | if (!*spec->image_name) { |
5608 | rbd_warn(NULL, "no image name provided"); | |
5609 | goto out_err; | |
5610 | } | |
d4b125e9 | 5611 | |
f28e565a AE |
5612 | /* |
5613 | * Snapshot name is optional; default is to use "-" | |
5614 | * (indicating the head/no snapshot). | |
5615 | */ | |
3feeb894 | 5616 | len = next_token(&buf); |
820a5f3e | 5617 | if (!len) { |
3feeb894 AE |
5618 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5619 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5620 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5621 | ret = -ENAMETOOLONG; |
f28e565a | 5622 | goto out_err; |
849b4260 | 5623 | } |
ecb4dc22 AE |
5624 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5625 | if (!snap_name) | |
f28e565a | 5626 | goto out_mem; |
ecb4dc22 AE |
5627 | *(snap_name + len) = '\0'; |
5628 | spec->snap_name = snap_name; | |
e5c35534 | 5629 | |
0ddebc0c | 5630 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5631 | |
4e9afeba AE |
5632 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
5633 | if (!rbd_opts) | |
5634 | goto out_mem; | |
5635 | ||
5636 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 5637 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
80de1912 | 5638 | rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
e010dd0a | 5639 | rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
d22f76e7 | 5640 | |
859c31df | 5641 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 5642 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 5643 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
5644 | if (IS_ERR(copts)) { |
5645 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5646 | goto out_err; |
5647 | } | |
859c31df AE |
5648 | kfree(options); |
5649 | ||
5650 | *ceph_opts = copts; | |
4e9afeba | 5651 | *opts = rbd_opts; |
859c31df | 5652 | *rbd_spec = spec; |
0ddebc0c | 5653 | |
dc79b113 | 5654 | return 0; |
f28e565a | 5655 | out_mem: |
dc79b113 | 5656 | ret = -ENOMEM; |
d22f76e7 | 5657 | out_err: |
859c31df AE |
5658 | kfree(rbd_opts); |
5659 | rbd_spec_put(spec); | |
f28e565a | 5660 | kfree(options); |
d22f76e7 | 5661 | |
dc79b113 | 5662 | return ret; |
a725f65e AE |
5663 | } |
5664 | ||
30ba1f02 ID |
5665 | /* |
5666 | * Return pool id (>= 0) or a negative error code. | |
5667 | */ | |
5668 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
5669 | { | |
a319bf56 | 5670 | struct ceph_options *opts = rbdc->client->options; |
30ba1f02 | 5671 | u64 newest_epoch; |
30ba1f02 ID |
5672 | int tries = 0; |
5673 | int ret; | |
5674 | ||
5675 | again: | |
5676 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
5677 | if (ret == -ENOENT && tries++ < 1) { | |
d0b19705 ID |
5678 | ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
5679 | &newest_epoch); | |
30ba1f02 ID |
5680 | if (ret < 0) |
5681 | return ret; | |
5682 | ||
5683 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
7cca78c9 | 5684 | ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
30ba1f02 | 5685 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
a319bf56 ID |
5686 | newest_epoch, |
5687 | opts->mount_timeout); | |
30ba1f02 ID |
5688 | goto again; |
5689 | } else { | |
5690 | /* the osdmap we have is new enough */ | |
5691 | return -ENOENT; | |
5692 | } | |
5693 | } | |
5694 | ||
5695 | return ret; | |
5696 | } | |
5697 | ||
e010dd0a ID |
5698 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5699 | { | |
5700 | down_write(&rbd_dev->lock_rwsem); | |
5701 | if (__rbd_is_lock_owner(rbd_dev)) | |
5702 | rbd_unlock(rbd_dev); | |
5703 | up_write(&rbd_dev->lock_rwsem); | |
5704 | } | |
5705 | ||
5706 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5707 | { | |
5708 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { | |
5709 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5710 | return -EINVAL; | |
5711 | } | |
5712 | ||
5713 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5714 | down_read(&rbd_dev->lock_rwsem); | |
5715 | rbd_wait_state_locked(rbd_dev); | |
5716 | up_read(&rbd_dev->lock_rwsem); | |
5717 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { | |
5718 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); | |
5719 | return -EROFS; | |
5720 | } | |
5721 | ||
5722 | return 0; | |
5723 | } | |
5724 | ||
589d30e0 AE |
5725 | /* |
5726 | * An rbd format 2 image has a unique identifier, distinct from the | |
5727 | * name given to it by the user. Internally, that identifier is | |
5728 | * what's used to specify the names of objects related to the image. | |
5729 | * | |
5730 | * A special "rbd id" object is used to map an rbd image name to its | |
5731 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5732 | * with the supplied name. | |
5733 | * | |
5734 | * This function will record the given rbd_dev's image_id field if | |
5735 | * it can be determined, and in that case will return 0. If any | |
5736 | * errors occur a negative errno will be returned and the rbd_dev's | |
5737 | * image_id field will be unchanged (and should be NULL). | |
5738 | */ | |
5739 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5740 | { | |
5741 | int ret; | |
5742 | size_t size; | |
ecd4a68a | 5743 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5744 | void *response; |
c0fba368 | 5745 | char *image_id; |
2f82ee54 | 5746 | |
2c0d0a10 AE |
5747 | /* |
5748 | * When probing a parent image, the image id is already | |
5749 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5750 | * need to fetch the image id again in this case. We |
5751 | * do still need to set the image format though. | |
2c0d0a10 | 5752 | */ |
c0fba368 AE |
5753 | if (rbd_dev->spec->image_id) { |
5754 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5755 | ||
2c0d0a10 | 5756 | return 0; |
c0fba368 | 5757 | } |
2c0d0a10 | 5758 | |
589d30e0 AE |
5759 | /* |
5760 | * First, see if the format 2 image id file exists, and if | |
5761 | * so, get the image's persistent id from it. | |
5762 | */ | |
ecd4a68a ID |
5763 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5764 | rbd_dev->spec->image_name); | |
5765 | if (ret) | |
5766 | return ret; | |
5767 | ||
5768 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5769 | |
5770 | /* Response will be an encoded string, which includes a length */ | |
5771 | ||
5772 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5773 | response = kzalloc(size, GFP_NOIO); | |
5774 | if (!response) { | |
5775 | ret = -ENOMEM; | |
5776 | goto out; | |
5777 | } | |
5778 | ||
c0fba368 AE |
5779 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5780 | ||
ecd4a68a ID |
5781 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5782 | "get_id", NULL, 0, | |
5783 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5784 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5785 | if (ret == -ENOENT) { |
5786 | image_id = kstrdup("", GFP_KERNEL); | |
5787 | ret = image_id ? 0 : -ENOMEM; | |
5788 | if (!ret) | |
5789 | rbd_dev->image_format = 1; | |
7dd440c9 | 5790 | } else if (ret >= 0) { |
c0fba368 AE |
5791 | void *p = response; |
5792 | ||
5793 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5794 | NULL, GFP_NOIO); |
461f758a | 5795 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5796 | if (!ret) |
5797 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5798 | } |
5799 | ||
5800 | if (!ret) { | |
5801 | rbd_dev->spec->image_id = image_id; | |
5802 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5803 | } |
5804 | out: | |
5805 | kfree(response); | |
ecd4a68a | 5806 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5807 | return ret; |
5808 | } | |
5809 | ||
3abef3b3 AE |
5810 | /* |
5811 | * Undo whatever state changes are made by v1 or v2 header info | |
5812 | * call. | |
5813 | */ | |
6fd48b3b AE |
5814 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5815 | { | |
5816 | struct rbd_image_header *header; | |
5817 | ||
e69b8d41 | 5818 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5819 | |
5820 | /* Free dynamic fields from the header, then zero it out */ | |
5821 | ||
5822 | header = &rbd_dev->header; | |
812164f8 | 5823 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5824 | kfree(header->snap_sizes); |
5825 | kfree(header->snap_names); | |
5826 | kfree(header->object_prefix); | |
5827 | memset(header, 0, sizeof (*header)); | |
5828 | } | |
5829 | ||
2df3fac7 | 5830 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5831 | { |
5832 | int ret; | |
a30b71b9 | 5833 | |
1e130199 | 5834 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5835 | if (ret) |
b1b5402a AE |
5836 | goto out_err; |
5837 | ||
2df3fac7 AE |
5838 | /* |
5839 | * Get the and check features for the image. Currently the | |
5840 | * features are assumed to never change. | |
5841 | */ | |
b1b5402a | 5842 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5843 | if (ret) |
9d475de5 | 5844 | goto out_err; |
35d489f9 | 5845 | |
cc070d59 AE |
5846 | /* If the image supports fancy striping, get its parameters */ |
5847 | ||
5848 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5849 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5850 | if (ret < 0) | |
5851 | goto out_err; | |
5852 | } | |
a30b71b9 | 5853 | |
7e97332e ID |
5854 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5855 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5856 | if (ret) | |
5857 | goto out_err; | |
5858 | } | |
5859 | ||
263423f8 | 5860 | rbd_init_layout(rbd_dev); |
35152979 | 5861 | return 0; |
263423f8 | 5862 | |
9d475de5 | 5863 | out_err: |
642a2537 | 5864 | rbd_dev->header.features = 0; |
1e130199 AE |
5865 | kfree(rbd_dev->header.object_prefix); |
5866 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5867 | return ret; |
a30b71b9 AE |
5868 | } |
5869 | ||
6d69bb53 ID |
5870 | /* |
5871 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5872 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5873 | * length of the already discovered part of the parent chain. | |
5874 | */ | |
5875 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5876 | { |
2f82ee54 | 5877 | struct rbd_device *parent = NULL; |
124afba2 AE |
5878 | int ret; |
5879 | ||
5880 | if (!rbd_dev->parent_spec) | |
5881 | return 0; | |
124afba2 | 5882 | |
6d69bb53 ID |
5883 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5884 | pr_info("parent chain is too long (%d)\n", depth); | |
5885 | ret = -EINVAL; | |
5886 | goto out_err; | |
5887 | } | |
5888 | ||
1643dfa4 | 5889 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5890 | if (!parent) { |
5891 | ret = -ENOMEM; | |
124afba2 | 5892 | goto out_err; |
1f2c6651 ID |
5893 | } |
5894 | ||
5895 | /* | |
5896 | * Images related by parent/child relationships always share | |
5897 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5898 | */ | |
5899 | __rbd_get_client(rbd_dev->rbd_client); | |
5900 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5901 | |
6d69bb53 | 5902 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5903 | if (ret < 0) |
5904 | goto out_err; | |
1f2c6651 | 5905 | |
124afba2 | 5906 | rbd_dev->parent = parent; |
a2acd00e | 5907 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5908 | return 0; |
1f2c6651 | 5909 | |
124afba2 | 5910 | out_err: |
1f2c6651 | 5911 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5912 | rbd_dev_destroy(parent); |
124afba2 AE |
5913 | return ret; |
5914 | } | |
5915 | ||
5769ed0c ID |
5916 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5917 | { | |
5918 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5919 | rbd_dev_mapping_clear(rbd_dev); | |
5920 | rbd_free_disk(rbd_dev); | |
5921 | if (!single_major) | |
5922 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5923 | } | |
5924 | ||
811c6688 ID |
5925 | /* |
5926 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5927 | * upon return. | |
5928 | */ | |
200a6a8b | 5929 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5930 | { |
83a06263 | 5931 | int ret; |
d1cf5788 | 5932 | |
9b60e70b | 5933 | /* Record our major and minor device numbers. */ |
83a06263 | 5934 | |
9b60e70b ID |
5935 | if (!single_major) { |
5936 | ret = register_blkdev(0, rbd_dev->name); | |
5937 | if (ret < 0) | |
1643dfa4 | 5938 | goto err_out_unlock; |
9b60e70b ID |
5939 | |
5940 | rbd_dev->major = ret; | |
5941 | rbd_dev->minor = 0; | |
5942 | } else { | |
5943 | rbd_dev->major = rbd_major; | |
5944 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5945 | } | |
83a06263 AE |
5946 | |
5947 | /* Set up the blkdev mapping. */ | |
5948 | ||
5949 | ret = rbd_init_disk(rbd_dev); | |
5950 | if (ret) | |
5951 | goto err_out_blkdev; | |
5952 | ||
f35a4dee | 5953 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5954 | if (ret) |
5955 | goto err_out_disk; | |
bc1ecc65 | 5956 | |
f35a4dee | 5957 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5958 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5959 | |
5769ed0c | 5960 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5961 | if (ret) |
f5ee37bd | 5962 | goto err_out_mapping; |
83a06263 | 5963 | |
129b79d4 | 5964 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5965 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5966 | return 0; |
2f82ee54 | 5967 | |
f35a4dee AE |
5968 | err_out_mapping: |
5969 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5970 | err_out_disk: |
5971 | rbd_free_disk(rbd_dev); | |
5972 | err_out_blkdev: | |
9b60e70b ID |
5973 | if (!single_major) |
5974 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5975 | err_out_unlock: |
5976 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5977 | return ret; |
5978 | } | |
5979 | ||
332bb12d AE |
5980 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5981 | { | |
5982 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5983 | int ret; |
332bb12d AE |
5984 | |
5985 | /* Record the header object name for this rbd image. */ | |
5986 | ||
5987 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5988 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5989 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5990 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5991 | else |
c41d13a3 ID |
5992 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5993 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5994 | |
c41d13a3 | 5995 | return ret; |
332bb12d AE |
5996 | } |
5997 | ||
200a6a8b AE |
5998 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5999 | { | |
6fd48b3b | 6000 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
6001 | if (rbd_dev->opts) |
6002 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
6003 | rbd_dev->image_format = 0; |
6004 | kfree(rbd_dev->spec->image_id); | |
6005 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
6006 | } |
6007 | ||
a30b71b9 AE |
6008 | /* |
6009 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
6010 | * device. If this image is the one being mapped (i.e., not a |
6011 | * parent), initiate a watch on its header object before using that | |
6012 | * object to get detailed information about the rbd image. | |
a30b71b9 | 6013 | */ |
6d69bb53 | 6014 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
6015 | { |
6016 | int ret; | |
6017 | ||
6018 | /* | |
3abef3b3 AE |
6019 | * Get the id from the image id object. Unless there's an |
6020 | * error, rbd_dev->spec->image_id will be filled in with | |
6021 | * a dynamically-allocated string, and rbd_dev->image_format | |
6022 | * will be set to either 1 or 2. | |
a30b71b9 AE |
6023 | */ |
6024 | ret = rbd_dev_image_id(rbd_dev); | |
6025 | if (ret) | |
c0fba368 | 6026 | return ret; |
c0fba368 | 6027 | |
332bb12d AE |
6028 | ret = rbd_dev_header_name(rbd_dev); |
6029 | if (ret) | |
6030 | goto err_out_format; | |
6031 | ||
6d69bb53 | 6032 | if (!depth) { |
99d16943 | 6033 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
6034 | if (ret) { |
6035 | if (ret == -ENOENT) | |
6036 | pr_info("image %s/%s does not exist\n", | |
6037 | rbd_dev->spec->pool_name, | |
6038 | rbd_dev->spec->image_name); | |
c41d13a3 | 6039 | goto err_out_format; |
1fe48023 | 6040 | } |
1f3ef788 | 6041 | } |
b644de2b | 6042 | |
a720ae09 | 6043 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 6044 | if (ret) |
b644de2b | 6045 | goto err_out_watch; |
83a06263 | 6046 | |
04077599 ID |
6047 | /* |
6048 | * If this image is the one being mapped, we have pool name and | |
6049 | * id, image name and id, and snap name - need to fill snap id. | |
6050 | * Otherwise this is a parent image, identified by pool, image | |
6051 | * and snap ids - need to fill in names for those ids. | |
6052 | */ | |
6d69bb53 | 6053 | if (!depth) |
04077599 ID |
6054 | ret = rbd_spec_fill_snap_id(rbd_dev); |
6055 | else | |
6056 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
6057 | if (ret) { |
6058 | if (ret == -ENOENT) | |
6059 | pr_info("snap %s/%s@%s does not exist\n", | |
6060 | rbd_dev->spec->pool_name, | |
6061 | rbd_dev->spec->image_name, | |
6062 | rbd_dev->spec->snap_name); | |
33dca39f | 6063 | goto err_out_probe; |
1fe48023 | 6064 | } |
9bb81c9b | 6065 | |
e8f59b59 ID |
6066 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
6067 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
6068 | if (ret) | |
6069 | goto err_out_probe; | |
6070 | ||
6071 | /* | |
6072 | * Need to warn users if this image is the one being | |
6073 | * mapped and has a parent. | |
6074 | */ | |
6d69bb53 | 6075 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
6076 | rbd_warn(rbd_dev, |
6077 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
6078 | } | |
6079 | ||
6d69bb53 | 6080 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
6081 | if (ret) |
6082 | goto err_out_probe; | |
6083 | ||
6084 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 6085 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 6086 | return 0; |
e8f59b59 | 6087 | |
6fd48b3b AE |
6088 | err_out_probe: |
6089 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 6090 | err_out_watch: |
6d69bb53 | 6091 | if (!depth) |
99d16943 | 6092 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
6093 | err_out_format: |
6094 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
6095 | kfree(rbd_dev->spec->image_id); |
6096 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
6097 | return ret; |
6098 | } | |
6099 | ||
9b60e70b ID |
6100 | static ssize_t do_rbd_add(struct bus_type *bus, |
6101 | const char *buf, | |
6102 | size_t count) | |
602adf40 | 6103 | { |
cb8627c7 | 6104 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 6105 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 6106 | struct rbd_options *rbd_opts = NULL; |
859c31df | 6107 | struct rbd_spec *spec = NULL; |
9d3997fd | 6108 | struct rbd_client *rbdc; |
b51c83c2 | 6109 | int rc; |
602adf40 YS |
6110 | |
6111 | if (!try_module_get(THIS_MODULE)) | |
6112 | return -ENODEV; | |
6113 | ||
602adf40 | 6114 | /* parse add command */ |
859c31df | 6115 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 6116 | if (rc < 0) |
dd5ac32d | 6117 | goto out; |
78cea76e | 6118 | |
9d3997fd AE |
6119 | rbdc = rbd_get_client(ceph_opts); |
6120 | if (IS_ERR(rbdc)) { | |
6121 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 6122 | goto err_out_args; |
9d3997fd | 6123 | } |
602adf40 | 6124 | |
602adf40 | 6125 | /* pick the pool */ |
30ba1f02 | 6126 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
1fe48023 ID |
6127 | if (rc < 0) { |
6128 | if (rc == -ENOENT) | |
6129 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 6130 | goto err_out_client; |
1fe48023 | 6131 | } |
c0cd10db | 6132 | spec->pool_id = (u64)rc; |
859c31df | 6133 | |
d147543d | 6134 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
6135 | if (!rbd_dev) { |
6136 | rc = -ENOMEM; | |
bd4ba655 | 6137 | goto err_out_client; |
b51c83c2 | 6138 | } |
c53d5893 AE |
6139 | rbdc = NULL; /* rbd_dev now owns this */ |
6140 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 6141 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 6142 | |
0d6d1e9c MC |
6143 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
6144 | if (!rbd_dev->config_info) { | |
6145 | rc = -ENOMEM; | |
6146 | goto err_out_rbd_dev; | |
6147 | } | |
6148 | ||
811c6688 | 6149 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 6150 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
6151 | if (rc < 0) { |
6152 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 6153 | goto err_out_rbd_dev; |
0d6d1e9c | 6154 | } |
05fd6f6f | 6155 | |
7ce4eef7 | 6156 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 6157 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 6158 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 6159 | |
b536f69a | 6160 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 6161 | if (rc) |
8b679ec5 | 6162 | goto err_out_image_probe; |
3abef3b3 | 6163 | |
e010dd0a ID |
6164 | if (rbd_dev->opts->exclusive) { |
6165 | rc = rbd_add_acquire_lock(rbd_dev); | |
6166 | if (rc) | |
6167 | goto err_out_device_setup; | |
3abef3b3 AE |
6168 | } |
6169 | ||
5769ed0c ID |
6170 | /* Everything's ready. Announce the disk to the world. */ |
6171 | ||
6172 | rc = device_add(&rbd_dev->dev); | |
6173 | if (rc) | |
e010dd0a | 6174 | goto err_out_image_lock; |
5769ed0c ID |
6175 | |
6176 | add_disk(rbd_dev->disk); | |
6177 | /* see rbd_init_disk() */ | |
6178 | blk_put_queue(rbd_dev->disk->queue); | |
6179 | ||
6180 | spin_lock(&rbd_dev_list_lock); | |
6181 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
6182 | spin_unlock(&rbd_dev_list_lock); | |
6183 | ||
6184 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
6185 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
6186 | rbd_dev->header.features); | |
dd5ac32d ID |
6187 | rc = count; |
6188 | out: | |
6189 | module_put(THIS_MODULE); | |
6190 | return rc; | |
b536f69a | 6191 | |
e010dd0a ID |
6192 | err_out_image_lock: |
6193 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
6194 | err_out_device_setup: |
6195 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
6196 | err_out_image_probe: |
6197 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
6198 | err_out_rbd_dev: |
6199 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 6200 | err_out_client: |
9d3997fd | 6201 | rbd_put_client(rbdc); |
0ddebc0c | 6202 | err_out_args: |
859c31df | 6203 | rbd_spec_put(spec); |
d147543d | 6204 | kfree(rbd_opts); |
dd5ac32d | 6205 | goto out; |
602adf40 YS |
6206 | } |
6207 | ||
9b60e70b ID |
6208 | static ssize_t rbd_add(struct bus_type *bus, |
6209 | const char *buf, | |
6210 | size_t count) | |
6211 | { | |
6212 | if (single_major) | |
6213 | return -EINVAL; | |
6214 | ||
6215 | return do_rbd_add(bus, buf, count); | |
6216 | } | |
6217 | ||
6218 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
6219 | const char *buf, | |
6220 | size_t count) | |
6221 | { | |
6222 | return do_rbd_add(bus, buf, count); | |
6223 | } | |
6224 | ||
05a46afd AE |
6225 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
6226 | { | |
ad945fc1 | 6227 | while (rbd_dev->parent) { |
05a46afd AE |
6228 | struct rbd_device *first = rbd_dev; |
6229 | struct rbd_device *second = first->parent; | |
6230 | struct rbd_device *third; | |
6231 | ||
6232 | /* | |
6233 | * Follow to the parent with no grandparent and | |
6234 | * remove it. | |
6235 | */ | |
6236 | while (second && (third = second->parent)) { | |
6237 | first = second; | |
6238 | second = third; | |
6239 | } | |
ad945fc1 | 6240 | rbd_assert(second); |
8ad42cd0 | 6241 | rbd_dev_image_release(second); |
8b679ec5 | 6242 | rbd_dev_destroy(second); |
ad945fc1 AE |
6243 | first->parent = NULL; |
6244 | first->parent_overlap = 0; | |
6245 | ||
6246 | rbd_assert(first->parent_spec); | |
05a46afd AE |
6247 | rbd_spec_put(first->parent_spec); |
6248 | first->parent_spec = NULL; | |
05a46afd AE |
6249 | } |
6250 | } | |
6251 | ||
9b60e70b ID |
6252 | static ssize_t do_rbd_remove(struct bus_type *bus, |
6253 | const char *buf, | |
6254 | size_t count) | |
602adf40 YS |
6255 | { |
6256 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
6257 | struct list_head *tmp; |
6258 | int dev_id; | |
0276dca6 | 6259 | char opt_buf[6]; |
82a442d2 | 6260 | bool already = false; |
0276dca6 | 6261 | bool force = false; |
0d8189e1 | 6262 | int ret; |
602adf40 | 6263 | |
0276dca6 MC |
6264 | dev_id = -1; |
6265 | opt_buf[0] = '\0'; | |
6266 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
6267 | if (dev_id < 0) { | |
6268 | pr_err("dev_id out of range\n"); | |
602adf40 | 6269 | return -EINVAL; |
0276dca6 MC |
6270 | } |
6271 | if (opt_buf[0] != '\0') { | |
6272 | if (!strcmp(opt_buf, "force")) { | |
6273 | force = true; | |
6274 | } else { | |
6275 | pr_err("bad remove option at '%s'\n", opt_buf); | |
6276 | return -EINVAL; | |
6277 | } | |
6278 | } | |
602adf40 | 6279 | |
751cc0e3 AE |
6280 | ret = -ENOENT; |
6281 | spin_lock(&rbd_dev_list_lock); | |
6282 | list_for_each(tmp, &rbd_dev_list) { | |
6283 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
6284 | if (rbd_dev->dev_id == dev_id) { | |
6285 | ret = 0; | |
6286 | break; | |
6287 | } | |
42382b70 | 6288 | } |
751cc0e3 AE |
6289 | if (!ret) { |
6290 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 6291 | if (rbd_dev->open_count && !force) |
751cc0e3 AE |
6292 | ret = -EBUSY; |
6293 | else | |
82a442d2 AE |
6294 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
6295 | &rbd_dev->flags); | |
751cc0e3 AE |
6296 | spin_unlock_irq(&rbd_dev->lock); |
6297 | } | |
6298 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 6299 | if (ret < 0 || already) |
1ba0f1e7 | 6300 | return ret; |
751cc0e3 | 6301 | |
0276dca6 MC |
6302 | if (force) { |
6303 | /* | |
6304 | * Prevent new IO from being queued and wait for existing | |
6305 | * IO to complete/fail. | |
6306 | */ | |
6307 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
6308 | blk_set_queue_dying(rbd_dev->disk->queue); | |
6309 | } | |
6310 | ||
5769ed0c ID |
6311 | del_gendisk(rbd_dev->disk); |
6312 | spin_lock(&rbd_dev_list_lock); | |
6313 | list_del_init(&rbd_dev->node); | |
6314 | spin_unlock(&rbd_dev_list_lock); | |
6315 | device_del(&rbd_dev->dev); | |
fca27065 | 6316 | |
e010dd0a | 6317 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 6318 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 6319 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 6320 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 6321 | return count; |
602adf40 YS |
6322 | } |
6323 | ||
9b60e70b ID |
6324 | static ssize_t rbd_remove(struct bus_type *bus, |
6325 | const char *buf, | |
6326 | size_t count) | |
6327 | { | |
6328 | if (single_major) | |
6329 | return -EINVAL; | |
6330 | ||
6331 | return do_rbd_remove(bus, buf, count); | |
6332 | } | |
6333 | ||
6334 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
6335 | const char *buf, | |
6336 | size_t count) | |
6337 | { | |
6338 | return do_rbd_remove(bus, buf, count); | |
6339 | } | |
6340 | ||
602adf40 YS |
6341 | /* |
6342 | * create control files in sysfs | |
dfc5606d | 6343 | * /sys/bus/rbd/... |
602adf40 YS |
6344 | */ |
6345 | static int rbd_sysfs_init(void) | |
6346 | { | |
dfc5606d | 6347 | int ret; |
602adf40 | 6348 | |
fed4c143 | 6349 | ret = device_register(&rbd_root_dev); |
21079786 | 6350 | if (ret < 0) |
dfc5606d | 6351 | return ret; |
602adf40 | 6352 | |
fed4c143 AE |
6353 | ret = bus_register(&rbd_bus_type); |
6354 | if (ret < 0) | |
6355 | device_unregister(&rbd_root_dev); | |
602adf40 | 6356 | |
602adf40 YS |
6357 | return ret; |
6358 | } | |
6359 | ||
6360 | static void rbd_sysfs_cleanup(void) | |
6361 | { | |
dfc5606d | 6362 | bus_unregister(&rbd_bus_type); |
fed4c143 | 6363 | device_unregister(&rbd_root_dev); |
602adf40 YS |
6364 | } |
6365 | ||
1c2a9dfe AE |
6366 | static int rbd_slab_init(void) |
6367 | { | |
6368 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 6369 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
6370 | if (!rbd_img_request_cache) |
6371 | return -ENOMEM; | |
6372 | ||
6373 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 6374 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
6375 | if (!rbd_obj_request_cache) |
6376 | goto out_err; | |
6377 | ||
f856dc36 N |
6378 | rbd_assert(!rbd_bio_clone); |
6379 | rbd_bio_clone = bioset_create(BIO_POOL_SIZE, 0, 0); | |
6380 | if (!rbd_bio_clone) | |
6381 | goto out_err_clone; | |
6382 | ||
6c696d85 | 6383 | return 0; |
1c2a9dfe | 6384 | |
f856dc36 N |
6385 | out_err_clone: |
6386 | kmem_cache_destroy(rbd_obj_request_cache); | |
6387 | rbd_obj_request_cache = NULL; | |
6c696d85 | 6388 | out_err: |
868311b1 AE |
6389 | kmem_cache_destroy(rbd_img_request_cache); |
6390 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
6391 | return -ENOMEM; |
6392 | } | |
6393 | ||
6394 | static void rbd_slab_exit(void) | |
6395 | { | |
868311b1 AE |
6396 | rbd_assert(rbd_obj_request_cache); |
6397 | kmem_cache_destroy(rbd_obj_request_cache); | |
6398 | rbd_obj_request_cache = NULL; | |
6399 | ||
1c2a9dfe AE |
6400 | rbd_assert(rbd_img_request_cache); |
6401 | kmem_cache_destroy(rbd_img_request_cache); | |
6402 | rbd_img_request_cache = NULL; | |
f856dc36 N |
6403 | |
6404 | rbd_assert(rbd_bio_clone); | |
6405 | bioset_free(rbd_bio_clone); | |
6406 | rbd_bio_clone = NULL; | |
1c2a9dfe AE |
6407 | } |
6408 | ||
cc344fa1 | 6409 | static int __init rbd_init(void) |
602adf40 YS |
6410 | { |
6411 | int rc; | |
6412 | ||
1e32d34c AE |
6413 | if (!libceph_compatible(NULL)) { |
6414 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
6415 | return -EINVAL; |
6416 | } | |
e1b4d96d | 6417 | |
1c2a9dfe | 6418 | rc = rbd_slab_init(); |
602adf40 YS |
6419 | if (rc) |
6420 | return rc; | |
e1b4d96d | 6421 | |
f5ee37bd ID |
6422 | /* |
6423 | * The number of active work items is limited by the number of | |
f77303bd | 6424 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
6425 | */ |
6426 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
6427 | if (!rbd_wq) { | |
6428 | rc = -ENOMEM; | |
6429 | goto err_out_slab; | |
6430 | } | |
6431 | ||
9b60e70b ID |
6432 | if (single_major) { |
6433 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
6434 | if (rbd_major < 0) { | |
6435 | rc = rbd_major; | |
f5ee37bd | 6436 | goto err_out_wq; |
9b60e70b ID |
6437 | } |
6438 | } | |
6439 | ||
1c2a9dfe AE |
6440 | rc = rbd_sysfs_init(); |
6441 | if (rc) | |
9b60e70b ID |
6442 | goto err_out_blkdev; |
6443 | ||
6444 | if (single_major) | |
6445 | pr_info("loaded (major %d)\n", rbd_major); | |
6446 | else | |
6447 | pr_info("loaded\n"); | |
1c2a9dfe | 6448 | |
e1b4d96d ID |
6449 | return 0; |
6450 | ||
9b60e70b ID |
6451 | err_out_blkdev: |
6452 | if (single_major) | |
6453 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
6454 | err_out_wq: |
6455 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
6456 | err_out_slab: |
6457 | rbd_slab_exit(); | |
1c2a9dfe | 6458 | return rc; |
602adf40 YS |
6459 | } |
6460 | ||
cc344fa1 | 6461 | static void __exit rbd_exit(void) |
602adf40 | 6462 | { |
ffe312cf | 6463 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6464 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6465 | if (single_major) |
6466 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6467 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6468 | rbd_slab_exit(); |
602adf40 YS |
6469 | } |
6470 | ||
6471 | module_init(rbd_init); | |
6472 | module_exit(rbd_exit); | |
6473 | ||
d552c619 | 6474 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6475 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6476 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6477 | /* following authorship retained from original osdblk.c */ |
6478 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6479 | ||
90da258b | 6480 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6481 | MODULE_LICENSE("GPL"); |