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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
ed95b21a | 34 | #include <linux/ceph/cls_lock_client.h> |
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 | ||
5cbf6f12 AE |
123 | #define RBD_FEATURE_LAYERING (1<<0) |
124 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
ed95b21a ID |
125 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1<<2) |
126 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ | |
127 | RBD_FEATURE_STRIPINGV2 | \ | |
128 | RBD_FEATURE_EXCLUSIVE_LOCK) | |
d889140c AE |
129 | |
130 | /* Features supported by this (client software) implementation. */ | |
131 | ||
770eba6e | 132 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 133 | |
81a89793 AE |
134 | /* |
135 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
136 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 137 | */ |
602adf40 YS |
138 | #define DEV_NAME_LEN 32 |
139 | ||
140 | /* | |
141 | * block device image metadata (in-memory version) | |
142 | */ | |
143 | struct rbd_image_header { | |
f35a4dee | 144 | /* These six fields never change for a given rbd image */ |
849b4260 | 145 | char *object_prefix; |
602adf40 YS |
146 | __u8 obj_order; |
147 | __u8 crypt_type; | |
148 | __u8 comp_type; | |
f35a4dee AE |
149 | u64 stripe_unit; |
150 | u64 stripe_count; | |
151 | u64 features; /* Might be changeable someday? */ | |
602adf40 | 152 | |
f84344f3 AE |
153 | /* The remaining fields need to be updated occasionally */ |
154 | u64 image_size; | |
155 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
156 | char *snap_names; /* format 1 only */ |
157 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
158 | }; |
159 | ||
0d7dbfce AE |
160 | /* |
161 | * An rbd image specification. | |
162 | * | |
163 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
164 | * identify an image. Each rbd_dev structure includes a pointer to |
165 | * an rbd_spec structure that encapsulates this identity. | |
166 | * | |
167 | * Each of the id's in an rbd_spec has an associated name. For a | |
168 | * user-mapped image, the names are supplied and the id's associated | |
169 | * with them are looked up. For a layered image, a parent image is | |
170 | * defined by the tuple, and the names are looked up. | |
171 | * | |
172 | * An rbd_dev structure contains a parent_spec pointer which is | |
173 | * non-null if the image it represents is a child in a layered | |
174 | * image. This pointer will refer to the rbd_spec structure used | |
175 | * by the parent rbd_dev for its own identity (i.e., the structure | |
176 | * is shared between the parent and child). | |
177 | * | |
178 | * Since these structures are populated once, during the discovery | |
179 | * phase of image construction, they are effectively immutable so | |
180 | * we make no effort to synchronize access to them. | |
181 | * | |
182 | * Note that code herein does not assume the image name is known (it | |
183 | * could be a null pointer). | |
0d7dbfce AE |
184 | */ |
185 | struct rbd_spec { | |
186 | u64 pool_id; | |
ecb4dc22 | 187 | const char *pool_name; |
0d7dbfce | 188 | |
ecb4dc22 AE |
189 | const char *image_id; |
190 | const char *image_name; | |
0d7dbfce AE |
191 | |
192 | u64 snap_id; | |
ecb4dc22 | 193 | const char *snap_name; |
0d7dbfce AE |
194 | |
195 | struct kref kref; | |
196 | }; | |
197 | ||
602adf40 | 198 | /* |
f0f8cef5 | 199 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
200 | */ |
201 | struct rbd_client { | |
202 | struct ceph_client *client; | |
203 | struct kref kref; | |
204 | struct list_head node; | |
205 | }; | |
206 | ||
bf0d5f50 AE |
207 | struct rbd_img_request; |
208 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
209 | ||
210 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
211 | ||
212 | struct rbd_obj_request; | |
213 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
214 | ||
9969ebc5 AE |
215 | enum obj_request_type { |
216 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
217 | }; | |
bf0d5f50 | 218 | |
6d2940c8 GZ |
219 | enum obj_operation_type { |
220 | OBJ_OP_WRITE, | |
221 | OBJ_OP_READ, | |
90e98c52 | 222 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
223 | }; |
224 | ||
926f9b3f AE |
225 | enum obj_req_flags { |
226 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 227 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
228 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
229 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
230 | }; |
231 | ||
bf0d5f50 AE |
232 | struct rbd_obj_request { |
233 | const char *object_name; | |
234 | u64 offset; /* object start byte */ | |
235 | u64 length; /* bytes from offset */ | |
926f9b3f | 236 | unsigned long flags; |
bf0d5f50 | 237 | |
c5b5ef6c AE |
238 | /* |
239 | * An object request associated with an image will have its | |
240 | * img_data flag set; a standalone object request will not. | |
241 | * | |
242 | * A standalone object request will have which == BAD_WHICH | |
243 | * and a null obj_request pointer. | |
244 | * | |
245 | * An object request initiated in support of a layered image | |
246 | * object (to check for its existence before a write) will | |
247 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
248 | * | |
249 | * Finally, an object request for rbd image data will have | |
250 | * which != BAD_WHICH, and will have a non-null img_request | |
251 | * pointer. The value of which will be in the range | |
252 | * 0..(img_request->obj_request_count-1). | |
253 | */ | |
254 | union { | |
255 | struct rbd_obj_request *obj_request; /* STAT op */ | |
256 | struct { | |
257 | struct rbd_img_request *img_request; | |
258 | u64 img_offset; | |
259 | /* links for img_request->obj_requests list */ | |
260 | struct list_head links; | |
261 | }; | |
262 | }; | |
bf0d5f50 AE |
263 | u32 which; /* posn image request list */ |
264 | ||
265 | enum obj_request_type type; | |
788e2df3 AE |
266 | union { |
267 | struct bio *bio_list; | |
268 | struct { | |
269 | struct page **pages; | |
270 | u32 page_count; | |
271 | }; | |
272 | }; | |
0eefd470 | 273 | struct page **copyup_pages; |
ebda6408 | 274 | u32 copyup_page_count; |
bf0d5f50 AE |
275 | |
276 | struct ceph_osd_request *osd_req; | |
277 | ||
278 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 279 | int result; |
bf0d5f50 AE |
280 | |
281 | rbd_obj_callback_t callback; | |
788e2df3 | 282 | struct completion completion; |
bf0d5f50 AE |
283 | |
284 | struct kref kref; | |
285 | }; | |
286 | ||
0c425248 | 287 | enum img_req_flags { |
9849e986 AE |
288 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
289 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 290 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
90e98c52 | 291 | IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
0c425248 AE |
292 | }; |
293 | ||
bf0d5f50 | 294 | struct rbd_img_request { |
bf0d5f50 AE |
295 | struct rbd_device *rbd_dev; |
296 | u64 offset; /* starting image byte offset */ | |
297 | u64 length; /* byte count from offset */ | |
0c425248 | 298 | unsigned long flags; |
bf0d5f50 | 299 | union { |
9849e986 | 300 | u64 snap_id; /* for reads */ |
bf0d5f50 | 301 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
302 | }; |
303 | union { | |
304 | struct request *rq; /* block request */ | |
305 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 306 | }; |
3d7efd18 | 307 | struct page **copyup_pages; |
ebda6408 | 308 | u32 copyup_page_count; |
bf0d5f50 AE |
309 | spinlock_t completion_lock;/* protects next_completion */ |
310 | u32 next_completion; | |
311 | rbd_img_callback_t callback; | |
55f27e09 | 312 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 313 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
314 | |
315 | u32 obj_request_count; | |
316 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
317 | ||
318 | struct kref kref; | |
319 | }; | |
320 | ||
321 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 322 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 323 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 324 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 325 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 326 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 327 | |
99d16943 ID |
328 | enum rbd_watch_state { |
329 | RBD_WATCH_STATE_UNREGISTERED, | |
330 | RBD_WATCH_STATE_REGISTERED, | |
331 | RBD_WATCH_STATE_ERROR, | |
332 | }; | |
333 | ||
ed95b21a ID |
334 | enum rbd_lock_state { |
335 | RBD_LOCK_STATE_UNLOCKED, | |
336 | RBD_LOCK_STATE_LOCKED, | |
337 | RBD_LOCK_STATE_RELEASING, | |
338 | }; | |
339 | ||
340 | /* WatchNotify::ClientId */ | |
341 | struct rbd_client_id { | |
342 | u64 gid; | |
343 | u64 handle; | |
344 | }; | |
345 | ||
f84344f3 | 346 | struct rbd_mapping { |
99c1f08f | 347 | u64 size; |
34b13184 | 348 | u64 features; |
f84344f3 AE |
349 | bool read_only; |
350 | }; | |
351 | ||
602adf40 YS |
352 | /* |
353 | * a single device | |
354 | */ | |
355 | struct rbd_device { | |
de71a297 | 356 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
357 | |
358 | int major; /* blkdev assigned major */ | |
dd82fff1 | 359 | int minor; |
602adf40 | 360 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 361 | |
a30b71b9 | 362 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
363 | struct rbd_client *rbd_client; |
364 | ||
365 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
366 | ||
b82d167b | 367 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
368 | |
369 | struct rbd_image_header header; | |
b82d167b | 370 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 371 | struct rbd_spec *spec; |
d147543d | 372 | struct rbd_options *opts; |
602adf40 | 373 | |
c41d13a3 | 374 | struct ceph_object_id header_oid; |
922dab61 | 375 | struct ceph_object_locator header_oloc; |
971f839a | 376 | |
1643dfa4 | 377 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 378 | |
99d16943 ID |
379 | struct mutex watch_mutex; |
380 | enum rbd_watch_state watch_state; | |
922dab61 | 381 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
382 | u64 watch_cookie; |
383 | struct delayed_work watch_dwork; | |
59c2be1e | 384 | |
ed95b21a ID |
385 | struct rw_semaphore lock_rwsem; |
386 | enum rbd_lock_state lock_state; | |
387 | struct rbd_client_id owner_cid; | |
388 | struct work_struct acquired_lock_work; | |
389 | struct work_struct released_lock_work; | |
390 | struct delayed_work lock_dwork; | |
391 | struct work_struct unlock_work; | |
392 | wait_queue_head_t lock_waitq; | |
393 | ||
1643dfa4 ID |
394 | struct workqueue_struct *task_wq; |
395 | ||
86b00e0d AE |
396 | struct rbd_spec *parent_spec; |
397 | u64 parent_overlap; | |
a2acd00e | 398 | atomic_t parent_ref; |
2f82ee54 | 399 | struct rbd_device *parent; |
86b00e0d | 400 | |
7ad18afa CH |
401 | /* Block layer tags. */ |
402 | struct blk_mq_tag_set tag_set; | |
403 | ||
c666601a JD |
404 | /* protects updating the header */ |
405 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
406 | |
407 | struct rbd_mapping mapping; | |
602adf40 YS |
408 | |
409 | struct list_head node; | |
dfc5606d | 410 | |
dfc5606d YS |
411 | /* sysfs related */ |
412 | struct device dev; | |
b82d167b | 413 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
414 | }; |
415 | ||
b82d167b AE |
416 | /* |
417 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
418 | * rbd_dev->lock is used to protect access. | |
419 | * | |
420 | * Currently, only the "removing" flag (which is coupled with the | |
421 | * "open_count" field) requires atomic access. | |
422 | */ | |
6d292906 AE |
423 | enum rbd_dev_flags { |
424 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 425 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
426 | }; |
427 | ||
cfbf6377 | 428 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 429 | |
602adf40 | 430 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
431 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
432 | ||
432b8587 AE |
433 | static LIST_HEAD(rbd_client_list); /* clients */ |
434 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 435 | |
78c2a44a AE |
436 | /* Slab caches for frequently-allocated structures */ |
437 | ||
1c2a9dfe | 438 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 439 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 440 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 441 | |
9b60e70b | 442 | static int rbd_major; |
f8a22fc2 ID |
443 | static DEFINE_IDA(rbd_dev_id_ida); |
444 | ||
f5ee37bd ID |
445 | static struct workqueue_struct *rbd_wq; |
446 | ||
9b60e70b ID |
447 | /* |
448 | * Default to false for now, as single-major requires >= 0.75 version of | |
449 | * userspace rbd utility. | |
450 | */ | |
451 | static bool single_major = false; | |
452 | module_param(single_major, bool, S_IRUGO); | |
453 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); | |
454 | ||
3d7efd18 AE |
455 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
456 | ||
f0f8cef5 AE |
457 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
458 | size_t count); | |
459 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
460 | size_t count); | |
9b60e70b ID |
461 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
462 | size_t count); | |
463 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
464 | size_t count); | |
6d69bb53 | 465 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
a2acd00e | 466 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 467 | |
9b60e70b ID |
468 | static int rbd_dev_id_to_minor(int dev_id) |
469 | { | |
7e513d43 | 470 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
471 | } |
472 | ||
473 | static int minor_to_rbd_dev_id(int minor) | |
474 | { | |
7e513d43 | 475 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
476 | } |
477 | ||
ed95b21a ID |
478 | static bool rbd_is_lock_supported(struct rbd_device *rbd_dev) |
479 | { | |
480 | return (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
481 | rbd_dev->spec->snap_id == CEPH_NOSNAP && | |
482 | !rbd_dev->mapping.read_only; | |
483 | } | |
484 | ||
485 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
486 | { | |
487 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
488 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
489 | } | |
490 | ||
491 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
492 | { | |
493 | bool is_lock_owner; | |
494 | ||
495 | down_read(&rbd_dev->lock_rwsem); | |
496 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
497 | up_read(&rbd_dev->lock_rwsem); | |
498 | return is_lock_owner; | |
499 | } | |
500 | ||
b15a21dd GKH |
501 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
502 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
503 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
504 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
b15a21dd GKH |
505 | |
506 | static struct attribute *rbd_bus_attrs[] = { | |
507 | &bus_attr_add.attr, | |
508 | &bus_attr_remove.attr, | |
9b60e70b ID |
509 | &bus_attr_add_single_major.attr, |
510 | &bus_attr_remove_single_major.attr, | |
b15a21dd | 511 | NULL, |
f0f8cef5 | 512 | }; |
92c76dc0 ID |
513 | |
514 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
515 | struct attribute *attr, int index) | |
516 | { | |
9b60e70b ID |
517 | if (!single_major && |
518 | (attr == &bus_attr_add_single_major.attr || | |
519 | attr == &bus_attr_remove_single_major.attr)) | |
520 | return 0; | |
521 | ||
92c76dc0 ID |
522 | return attr->mode; |
523 | } | |
524 | ||
525 | static const struct attribute_group rbd_bus_group = { | |
526 | .attrs = rbd_bus_attrs, | |
527 | .is_visible = rbd_bus_is_visible, | |
528 | }; | |
529 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
530 | |
531 | static struct bus_type rbd_bus_type = { | |
532 | .name = "rbd", | |
b15a21dd | 533 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
534 | }; |
535 | ||
536 | static void rbd_root_dev_release(struct device *dev) | |
537 | { | |
538 | } | |
539 | ||
540 | static struct device rbd_root_dev = { | |
541 | .init_name = "rbd", | |
542 | .release = rbd_root_dev_release, | |
543 | }; | |
544 | ||
06ecc6cb AE |
545 | static __printf(2, 3) |
546 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
547 | { | |
548 | struct va_format vaf; | |
549 | va_list args; | |
550 | ||
551 | va_start(args, fmt); | |
552 | vaf.fmt = fmt; | |
553 | vaf.va = &args; | |
554 | ||
555 | if (!rbd_dev) | |
556 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
557 | else if (rbd_dev->disk) | |
558 | printk(KERN_WARNING "%s: %s: %pV\n", | |
559 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
560 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
561 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
562 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
563 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
564 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
565 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
566 | else /* punt */ | |
567 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
568 | RBD_DRV_NAME, rbd_dev, &vaf); | |
569 | va_end(args); | |
570 | } | |
571 | ||
aafb230e AE |
572 | #ifdef RBD_DEBUG |
573 | #define rbd_assert(expr) \ | |
574 | if (unlikely(!(expr))) { \ | |
575 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
576 | "at line %d:\n\n" \ | |
577 | "\trbd_assert(%s);\n\n", \ | |
578 | __func__, __LINE__, #expr); \ | |
579 | BUG(); \ | |
580 | } | |
581 | #else /* !RBD_DEBUG */ | |
582 | # define rbd_assert(expr) ((void) 0) | |
583 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 584 | |
2761713d | 585 | static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); |
b454e36d | 586 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
587 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
588 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 589 | |
cc4a38bd | 590 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 591 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 592 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 593 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
594 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
595 | u64 snap_id); | |
2ad3d716 AE |
596 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
597 | u8 *order, u64 *snap_size); | |
598 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
599 | u64 *snap_features); | |
59c2be1e | 600 | |
602adf40 YS |
601 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
602 | { | |
f0f8cef5 | 603 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 604 | bool removing = false; |
602adf40 | 605 | |
f84344f3 | 606 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
607 | return -EROFS; |
608 | ||
a14ea269 | 609 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
610 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
611 | removing = true; | |
612 | else | |
613 | rbd_dev->open_count++; | |
a14ea269 | 614 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
615 | if (removing) |
616 | return -ENOENT; | |
617 | ||
c3e946ce | 618 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 619 | |
602adf40 YS |
620 | return 0; |
621 | } | |
622 | ||
db2a144b | 623 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
624 | { |
625 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
626 | unsigned long open_count_before; |
627 | ||
a14ea269 | 628 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 629 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 630 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 631 | rbd_assert(open_count_before > 0); |
dfc5606d | 632 | |
c3e946ce | 633 | put_device(&rbd_dev->dev); |
dfc5606d YS |
634 | } |
635 | ||
131fd9f6 GZ |
636 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
637 | { | |
77f33c03 | 638 | int ret = 0; |
131fd9f6 GZ |
639 | int val; |
640 | bool ro; | |
77f33c03 | 641 | bool ro_changed = false; |
131fd9f6 | 642 | |
77f33c03 | 643 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
131fd9f6 GZ |
644 | if (get_user(val, (int __user *)(arg))) |
645 | return -EFAULT; | |
646 | ||
647 | ro = val ? true : false; | |
648 | /* Snapshot doesn't allow to write*/ | |
649 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) | |
650 | return -EROFS; | |
651 | ||
77f33c03 JD |
652 | spin_lock_irq(&rbd_dev->lock); |
653 | /* prevent others open this device */ | |
654 | if (rbd_dev->open_count > 1) { | |
655 | ret = -EBUSY; | |
656 | goto out; | |
657 | } | |
658 | ||
131fd9f6 GZ |
659 | if (rbd_dev->mapping.read_only != ro) { |
660 | rbd_dev->mapping.read_only = ro; | |
77f33c03 | 661 | ro_changed = true; |
131fd9f6 GZ |
662 | } |
663 | ||
77f33c03 JD |
664 | out: |
665 | spin_unlock_irq(&rbd_dev->lock); | |
666 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ | |
667 | if (ret == 0 && ro_changed) | |
668 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); | |
669 | ||
670 | return ret; | |
131fd9f6 GZ |
671 | } |
672 | ||
673 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
674 | unsigned int cmd, unsigned long arg) | |
675 | { | |
676 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
677 | int ret = 0; | |
678 | ||
131fd9f6 GZ |
679 | switch (cmd) { |
680 | case BLKROSET: | |
681 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
682 | break; | |
683 | default: | |
684 | ret = -ENOTTY; | |
685 | } | |
686 | ||
131fd9f6 GZ |
687 | return ret; |
688 | } | |
689 | ||
690 | #ifdef CONFIG_COMPAT | |
691 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
692 | unsigned int cmd, unsigned long arg) | |
693 | { | |
694 | return rbd_ioctl(bdev, mode, cmd, arg); | |
695 | } | |
696 | #endif /* CONFIG_COMPAT */ | |
697 | ||
602adf40 YS |
698 | static const struct block_device_operations rbd_bd_ops = { |
699 | .owner = THIS_MODULE, | |
700 | .open = rbd_open, | |
dfc5606d | 701 | .release = rbd_release, |
131fd9f6 GZ |
702 | .ioctl = rbd_ioctl, |
703 | #ifdef CONFIG_COMPAT | |
704 | .compat_ioctl = rbd_compat_ioctl, | |
705 | #endif | |
602adf40 YS |
706 | }; |
707 | ||
708 | /* | |
7262cfca | 709 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 710 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 711 | */ |
f8c38929 | 712 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
713 | { |
714 | struct rbd_client *rbdc; | |
715 | int ret = -ENOMEM; | |
716 | ||
37206ee5 | 717 | dout("%s:\n", __func__); |
602adf40 YS |
718 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
719 | if (!rbdc) | |
720 | goto out_opt; | |
721 | ||
722 | kref_init(&rbdc->kref); | |
723 | INIT_LIST_HEAD(&rbdc->node); | |
724 | ||
43ae4701 | 725 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 726 | if (IS_ERR(rbdc->client)) |
08f75463 | 727 | goto out_rbdc; |
43ae4701 | 728 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
729 | |
730 | ret = ceph_open_session(rbdc->client); | |
731 | if (ret < 0) | |
08f75463 | 732 | goto out_client; |
602adf40 | 733 | |
432b8587 | 734 | spin_lock(&rbd_client_list_lock); |
602adf40 | 735 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 736 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 737 | |
37206ee5 | 738 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 739 | |
602adf40 | 740 | return rbdc; |
08f75463 | 741 | out_client: |
602adf40 | 742 | ceph_destroy_client(rbdc->client); |
08f75463 | 743 | out_rbdc: |
602adf40 YS |
744 | kfree(rbdc); |
745 | out_opt: | |
43ae4701 AE |
746 | if (ceph_opts) |
747 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
748 | dout("%s: error %d\n", __func__, ret); |
749 | ||
28f259b7 | 750 | return ERR_PTR(ret); |
602adf40 YS |
751 | } |
752 | ||
2f82ee54 AE |
753 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
754 | { | |
755 | kref_get(&rbdc->kref); | |
756 | ||
757 | return rbdc; | |
758 | } | |
759 | ||
602adf40 | 760 | /* |
1f7ba331 AE |
761 | * Find a ceph client with specific addr and configuration. If |
762 | * found, bump its reference count. | |
602adf40 | 763 | */ |
1f7ba331 | 764 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
765 | { |
766 | struct rbd_client *client_node; | |
1f7ba331 | 767 | bool found = false; |
602adf40 | 768 | |
43ae4701 | 769 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
770 | return NULL; |
771 | ||
1f7ba331 AE |
772 | spin_lock(&rbd_client_list_lock); |
773 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
774 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
775 | __rbd_get_client(client_node); |
776 | ||
1f7ba331 AE |
777 | found = true; |
778 | break; | |
779 | } | |
780 | } | |
781 | spin_unlock(&rbd_client_list_lock); | |
782 | ||
783 | return found ? client_node : NULL; | |
602adf40 YS |
784 | } |
785 | ||
59c2be1e | 786 | /* |
210c104c | 787 | * (Per device) rbd map options |
59c2be1e YS |
788 | */ |
789 | enum { | |
b5584180 | 790 | Opt_queue_depth, |
59c2be1e YS |
791 | Opt_last_int, |
792 | /* int args above */ | |
793 | Opt_last_string, | |
794 | /* string args above */ | |
cc0538b6 AE |
795 | Opt_read_only, |
796 | Opt_read_write, | |
210c104c | 797 | Opt_err |
59c2be1e YS |
798 | }; |
799 | ||
43ae4701 | 800 | static match_table_t rbd_opts_tokens = { |
b5584180 | 801 | {Opt_queue_depth, "queue_depth=%d"}, |
59c2be1e YS |
802 | /* int args above */ |
803 | /* string args above */ | |
be466c1c | 804 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
805 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
806 | {Opt_read_write, "read_write"}, | |
807 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
210c104c | 808 | {Opt_err, NULL} |
59c2be1e YS |
809 | }; |
810 | ||
98571b5a | 811 | struct rbd_options { |
b5584180 | 812 | int queue_depth; |
98571b5a AE |
813 | bool read_only; |
814 | }; | |
815 | ||
b5584180 | 816 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
98571b5a AE |
817 | #define RBD_READ_ONLY_DEFAULT false |
818 | ||
59c2be1e YS |
819 | static int parse_rbd_opts_token(char *c, void *private) |
820 | { | |
43ae4701 | 821 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
822 | substring_t argstr[MAX_OPT_ARGS]; |
823 | int token, intval, ret; | |
824 | ||
43ae4701 | 825 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
826 | if (token < Opt_last_int) { |
827 | ret = match_int(&argstr[0], &intval); | |
828 | if (ret < 0) { | |
210c104c | 829 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
830 | return ret; |
831 | } | |
832 | dout("got int token %d val %d\n", token, intval); | |
833 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 834 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
835 | } else { |
836 | dout("got token %d\n", token); | |
837 | } | |
838 | ||
839 | switch (token) { | |
b5584180 ID |
840 | case Opt_queue_depth: |
841 | if (intval < 1) { | |
842 | pr_err("queue_depth out of range\n"); | |
843 | return -EINVAL; | |
844 | } | |
845 | rbd_opts->queue_depth = intval; | |
846 | break; | |
cc0538b6 AE |
847 | case Opt_read_only: |
848 | rbd_opts->read_only = true; | |
849 | break; | |
850 | case Opt_read_write: | |
851 | rbd_opts->read_only = false; | |
852 | break; | |
59c2be1e | 853 | default: |
210c104c ID |
854 | /* libceph prints "bad option" msg */ |
855 | return -EINVAL; | |
59c2be1e | 856 | } |
210c104c | 857 | |
59c2be1e YS |
858 | return 0; |
859 | } | |
860 | ||
6d2940c8 GZ |
861 | static char* obj_op_name(enum obj_operation_type op_type) |
862 | { | |
863 | switch (op_type) { | |
864 | case OBJ_OP_READ: | |
865 | return "read"; | |
866 | case OBJ_OP_WRITE: | |
867 | return "write"; | |
90e98c52 GZ |
868 | case OBJ_OP_DISCARD: |
869 | return "discard"; | |
6d2940c8 GZ |
870 | default: |
871 | return "???"; | |
872 | } | |
873 | } | |
874 | ||
602adf40 YS |
875 | /* |
876 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
877 | * not exist create it. Either way, ceph_opts is consumed by this |
878 | * function. | |
602adf40 | 879 | */ |
9d3997fd | 880 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 881 | { |
f8c38929 | 882 | struct rbd_client *rbdc; |
59c2be1e | 883 | |
cfbf6377 | 884 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 885 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 886 | if (rbdc) /* using an existing client */ |
43ae4701 | 887 | ceph_destroy_options(ceph_opts); |
9d3997fd | 888 | else |
f8c38929 | 889 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 890 | mutex_unlock(&client_mutex); |
602adf40 | 891 | |
9d3997fd | 892 | return rbdc; |
602adf40 YS |
893 | } |
894 | ||
895 | /* | |
896 | * Destroy ceph client | |
d23a4b3f | 897 | * |
432b8587 | 898 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
899 | */ |
900 | static void rbd_client_release(struct kref *kref) | |
901 | { | |
902 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
903 | ||
37206ee5 | 904 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 905 | spin_lock(&rbd_client_list_lock); |
602adf40 | 906 | list_del(&rbdc->node); |
cd9d9f5d | 907 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
908 | |
909 | ceph_destroy_client(rbdc->client); | |
910 | kfree(rbdc); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
915 | * it. | |
916 | */ | |
9d3997fd | 917 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 918 | { |
c53d5893 AE |
919 | if (rbdc) |
920 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
921 | } |
922 | ||
a30b71b9 AE |
923 | static bool rbd_image_format_valid(u32 image_format) |
924 | { | |
925 | return image_format == 1 || image_format == 2; | |
926 | } | |
927 | ||
8e94af8e AE |
928 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
929 | { | |
103a150f AE |
930 | size_t size; |
931 | u32 snap_count; | |
932 | ||
933 | /* The header has to start with the magic rbd header text */ | |
934 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
935 | return false; | |
936 | ||
db2388b6 AE |
937 | /* The bio layer requires at least sector-sized I/O */ |
938 | ||
939 | if (ondisk->options.order < SECTOR_SHIFT) | |
940 | return false; | |
941 | ||
942 | /* If we use u64 in a few spots we may be able to loosen this */ | |
943 | ||
944 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
945 | return false; | |
946 | ||
103a150f AE |
947 | /* |
948 | * The size of a snapshot header has to fit in a size_t, and | |
949 | * that limits the number of snapshots. | |
950 | */ | |
951 | snap_count = le32_to_cpu(ondisk->snap_count); | |
952 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
953 | if (snap_count > size / sizeof (__le64)) | |
954 | return false; | |
955 | ||
956 | /* | |
957 | * Not only that, but the size of the entire the snapshot | |
958 | * header must also be representable in a size_t. | |
959 | */ | |
960 | size -= snap_count * sizeof (__le64); | |
961 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
962 | return false; | |
963 | ||
964 | return true; | |
8e94af8e AE |
965 | } |
966 | ||
602adf40 | 967 | /* |
bb23e37a AE |
968 | * Fill an rbd image header with information from the given format 1 |
969 | * on-disk header. | |
602adf40 | 970 | */ |
662518b1 | 971 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 972 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 973 | { |
662518b1 | 974 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
975 | bool first_time = header->object_prefix == NULL; |
976 | struct ceph_snap_context *snapc; | |
977 | char *object_prefix = NULL; | |
978 | char *snap_names = NULL; | |
979 | u64 *snap_sizes = NULL; | |
ccece235 | 980 | u32 snap_count; |
d2bb24e5 | 981 | size_t size; |
bb23e37a | 982 | int ret = -ENOMEM; |
621901d6 | 983 | u32 i; |
602adf40 | 984 | |
bb23e37a | 985 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 986 | |
bb23e37a AE |
987 | if (first_time) { |
988 | size_t len; | |
103a150f | 989 | |
bb23e37a AE |
990 | len = strnlen(ondisk->object_prefix, |
991 | sizeof (ondisk->object_prefix)); | |
992 | object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
993 | if (!object_prefix) | |
994 | return -ENOMEM; | |
995 | memcpy(object_prefix, ondisk->object_prefix, len); | |
996 | object_prefix[len] = '\0'; | |
997 | } | |
00f1f36f | 998 | |
bb23e37a | 999 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1000 | |
bb23e37a AE |
1001 | snap_count = le32_to_cpu(ondisk->snap_count); |
1002 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1003 | if (!snapc) | |
1004 | goto out_err; | |
1005 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1006 | if (snap_count) { |
bb23e37a | 1007 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1008 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1009 | ||
bb23e37a | 1010 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1011 | |
bb23e37a AE |
1012 | if (snap_names_len > (u64)SIZE_MAX) |
1013 | goto out_2big; | |
1014 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1015 | if (!snap_names) | |
6a52325f AE |
1016 | goto out_err; |
1017 | ||
bb23e37a | 1018 | /* ...as well as the array of their sizes. */ |
621901d6 | 1019 | |
d2bb24e5 | 1020 | size = snap_count * sizeof (*header->snap_sizes); |
bb23e37a AE |
1021 | snap_sizes = kmalloc(size, GFP_KERNEL); |
1022 | if (!snap_sizes) | |
6a52325f | 1023 | goto out_err; |
bb23e37a | 1024 | |
f785cc1d | 1025 | /* |
bb23e37a AE |
1026 | * Copy the names, and fill in each snapshot's id |
1027 | * and size. | |
1028 | * | |
99a41ebc | 1029 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1030 | * ondisk buffer we're working with has |
f785cc1d AE |
1031 | * snap_names_len bytes beyond the end of the |
1032 | * snapshot id array, this memcpy() is safe. | |
1033 | */ | |
bb23e37a AE |
1034 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1035 | snaps = ondisk->snaps; | |
1036 | for (i = 0; i < snap_count; i++) { | |
1037 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1038 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1039 | } | |
602adf40 | 1040 | } |
6a52325f | 1041 | |
bb23e37a | 1042 | /* We won't fail any more, fill in the header */ |
621901d6 | 1043 | |
bb23e37a AE |
1044 | if (first_time) { |
1045 | header->object_prefix = object_prefix; | |
1046 | header->obj_order = ondisk->options.order; | |
1047 | header->crypt_type = ondisk->options.crypt_type; | |
1048 | header->comp_type = ondisk->options.comp_type; | |
1049 | /* The rest aren't used for format 1 images */ | |
1050 | header->stripe_unit = 0; | |
1051 | header->stripe_count = 0; | |
1052 | header->features = 0; | |
602adf40 | 1053 | } else { |
662518b1 AE |
1054 | ceph_put_snap_context(header->snapc); |
1055 | kfree(header->snap_names); | |
1056 | kfree(header->snap_sizes); | |
602adf40 | 1057 | } |
849b4260 | 1058 | |
bb23e37a | 1059 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1060 | |
f84344f3 | 1061 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1062 | header->snapc = snapc; |
1063 | header->snap_names = snap_names; | |
1064 | header->snap_sizes = snap_sizes; | |
468521c1 | 1065 | |
602adf40 | 1066 | return 0; |
bb23e37a AE |
1067 | out_2big: |
1068 | ret = -EIO; | |
6a52325f | 1069 | out_err: |
bb23e37a AE |
1070 | kfree(snap_sizes); |
1071 | kfree(snap_names); | |
1072 | ceph_put_snap_context(snapc); | |
1073 | kfree(object_prefix); | |
ccece235 | 1074 | |
bb23e37a | 1075 | return ret; |
602adf40 YS |
1076 | } |
1077 | ||
9682fc6d AE |
1078 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1079 | { | |
1080 | const char *snap_name; | |
1081 | ||
1082 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1083 | ||
1084 | /* Skip over names until we find the one we are looking for */ | |
1085 | ||
1086 | snap_name = rbd_dev->header.snap_names; | |
1087 | while (which--) | |
1088 | snap_name += strlen(snap_name) + 1; | |
1089 | ||
1090 | return kstrdup(snap_name, GFP_KERNEL); | |
1091 | } | |
1092 | ||
30d1cff8 AE |
1093 | /* |
1094 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1095 | * Note that result is for snapshots in *descending* order. | |
1096 | */ | |
1097 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1098 | { | |
1099 | u64 snap_id1 = *(u64 *)s1; | |
1100 | u64 snap_id2 = *(u64 *)s2; | |
1101 | ||
1102 | if (snap_id1 < snap_id2) | |
1103 | return 1; | |
1104 | return snap_id1 == snap_id2 ? 0 : -1; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Search a snapshot context to see if the given snapshot id is | |
1109 | * present. | |
1110 | * | |
1111 | * Returns the position of the snapshot id in the array if it's found, | |
1112 | * or BAD_SNAP_INDEX otherwise. | |
1113 | * | |
1114 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1115 | * reverse order, highest snapshot id first. | |
1116 | */ | |
9682fc6d AE |
1117 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1118 | { | |
1119 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1120 | u64 *found; |
9682fc6d | 1121 | |
30d1cff8 AE |
1122 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1123 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1124 | |
30d1cff8 | 1125 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1126 | } |
1127 | ||
2ad3d716 AE |
1128 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1129 | u64 snap_id) | |
9e15b77d | 1130 | { |
54cac61f | 1131 | u32 which; |
da6a6b63 | 1132 | const char *snap_name; |
9e15b77d | 1133 | |
54cac61f AE |
1134 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1135 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1136 | return ERR_PTR(-ENOENT); |
54cac61f | 1137 | |
da6a6b63 JD |
1138 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1139 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1140 | } |
1141 | ||
1142 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1143 | { | |
9e15b77d AE |
1144 | if (snap_id == CEPH_NOSNAP) |
1145 | return RBD_SNAP_HEAD_NAME; | |
1146 | ||
54cac61f AE |
1147 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1148 | if (rbd_dev->image_format == 1) | |
1149 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1150 | |
54cac61f | 1151 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1152 | } |
1153 | ||
2ad3d716 AE |
1154 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1155 | u64 *snap_size) | |
602adf40 | 1156 | { |
2ad3d716 AE |
1157 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1158 | if (snap_id == CEPH_NOSNAP) { | |
1159 | *snap_size = rbd_dev->header.image_size; | |
1160 | } else if (rbd_dev->image_format == 1) { | |
1161 | u32 which; | |
602adf40 | 1162 | |
2ad3d716 AE |
1163 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1164 | if (which == BAD_SNAP_INDEX) | |
1165 | return -ENOENT; | |
e86924a8 | 1166 | |
2ad3d716 AE |
1167 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1168 | } else { | |
1169 | u64 size = 0; | |
1170 | int ret; | |
1171 | ||
1172 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1173 | if (ret) | |
1174 | return ret; | |
1175 | ||
1176 | *snap_size = size; | |
1177 | } | |
1178 | return 0; | |
602adf40 YS |
1179 | } |
1180 | ||
2ad3d716 AE |
1181 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1182 | u64 *snap_features) | |
602adf40 | 1183 | { |
2ad3d716 AE |
1184 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1185 | if (snap_id == CEPH_NOSNAP) { | |
1186 | *snap_features = rbd_dev->header.features; | |
1187 | } else if (rbd_dev->image_format == 1) { | |
1188 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1189 | } else { |
2ad3d716 AE |
1190 | u64 features = 0; |
1191 | int ret; | |
8b0241f8 | 1192 | |
2ad3d716 AE |
1193 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1194 | if (ret) | |
1195 | return ret; | |
1196 | ||
1197 | *snap_features = features; | |
1198 | } | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1203 | { | |
8f4b7d98 | 1204 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1205 | u64 size = 0; |
1206 | u64 features = 0; | |
1207 | int ret; | |
1208 | ||
2ad3d716 AE |
1209 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1210 | if (ret) | |
1211 | return ret; | |
1212 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1213 | if (ret) | |
1214 | return ret; | |
1215 | ||
1216 | rbd_dev->mapping.size = size; | |
1217 | rbd_dev->mapping.features = features; | |
1218 | ||
8b0241f8 | 1219 | return 0; |
602adf40 YS |
1220 | } |
1221 | ||
d1cf5788 AE |
1222 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1223 | { | |
1224 | rbd_dev->mapping.size = 0; | |
1225 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1226 | } |
1227 | ||
7d5079aa HS |
1228 | static void rbd_segment_name_free(const char *name) |
1229 | { | |
1230 | /* The explicit cast here is needed to drop the const qualifier */ | |
1231 | ||
1232 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
1233 | } | |
1234 | ||
98571b5a | 1235 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 1236 | { |
65ccfe21 AE |
1237 | char *name; |
1238 | u64 segment; | |
1239 | int ret; | |
3a96d5cd | 1240 | char *name_format; |
602adf40 | 1241 | |
78c2a44a | 1242 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
1243 | if (!name) |
1244 | return NULL; | |
1245 | segment = offset >> rbd_dev->header.obj_order; | |
3a96d5cd JD |
1246 | name_format = "%s.%012llx"; |
1247 | if (rbd_dev->image_format == 2) | |
1248 | name_format = "%s.%016llx"; | |
2d0ebc5d | 1249 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
65ccfe21 | 1250 | rbd_dev->header.object_prefix, segment); |
2d0ebc5d | 1251 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
65ccfe21 AE |
1252 | pr_err("error formatting segment name for #%llu (%d)\n", |
1253 | segment, ret); | |
7d5079aa | 1254 | rbd_segment_name_free(name); |
65ccfe21 AE |
1255 | name = NULL; |
1256 | } | |
602adf40 | 1257 | |
65ccfe21 AE |
1258 | return name; |
1259 | } | |
602adf40 | 1260 | |
65ccfe21 AE |
1261 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1262 | { | |
1263 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 1264 | |
65ccfe21 AE |
1265 | return offset & (segment_size - 1); |
1266 | } | |
1267 | ||
1268 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1269 | u64 offset, u64 length) | |
1270 | { | |
1271 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1272 | ||
1273 | offset &= segment_size - 1; | |
1274 | ||
aafb230e | 1275 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1276 | if (offset + length > segment_size) |
1277 | length = segment_size - offset; | |
1278 | ||
1279 | return length; | |
602adf40 YS |
1280 | } |
1281 | ||
029bcbd8 JD |
1282 | /* |
1283 | * returns the size of an object in the image | |
1284 | */ | |
1285 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1286 | { | |
1287 | return 1 << header->obj_order; | |
1288 | } | |
1289 | ||
602adf40 YS |
1290 | /* |
1291 | * bio helpers | |
1292 | */ | |
1293 | ||
1294 | static void bio_chain_put(struct bio *chain) | |
1295 | { | |
1296 | struct bio *tmp; | |
1297 | ||
1298 | while (chain) { | |
1299 | tmp = chain; | |
1300 | chain = chain->bi_next; | |
1301 | bio_put(tmp); | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * zeros a bio chain, starting at specific offset | |
1307 | */ | |
1308 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1309 | { | |
7988613b KO |
1310 | struct bio_vec bv; |
1311 | struct bvec_iter iter; | |
602adf40 YS |
1312 | unsigned long flags; |
1313 | void *buf; | |
602adf40 YS |
1314 | int pos = 0; |
1315 | ||
1316 | while (chain) { | |
7988613b KO |
1317 | bio_for_each_segment(bv, chain, iter) { |
1318 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1319 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1320 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1321 | memset(buf + remainder, 0, |
7988613b KO |
1322 | bv.bv_len - remainder); |
1323 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1324 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1325 | } |
7988613b | 1326 | pos += bv.bv_len; |
602adf40 YS |
1327 | } |
1328 | ||
1329 | chain = chain->bi_next; | |
1330 | } | |
1331 | } | |
1332 | ||
b9434c5b AE |
1333 | /* |
1334 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1335 | * starting at the given byte offset from the start of the array and | |
1336 | * continuing up to the given end offset. The pages array is | |
1337 | * assumed to be big enough to hold all bytes up to the end. | |
1338 | */ | |
1339 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1340 | { | |
1341 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1342 | ||
1343 | rbd_assert(end > offset); | |
1344 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1345 | while (offset < end) { | |
1346 | size_t page_offset; | |
1347 | size_t length; | |
1348 | unsigned long flags; | |
1349 | void *kaddr; | |
1350 | ||
491205a8 GU |
1351 | page_offset = offset & ~PAGE_MASK; |
1352 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1353 | local_irq_save(flags); |
1354 | kaddr = kmap_atomic(*page); | |
1355 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1356 | flush_dcache_page(*page); |
b9434c5b AE |
1357 | kunmap_atomic(kaddr); |
1358 | local_irq_restore(flags); | |
1359 | ||
1360 | offset += length; | |
1361 | page++; | |
1362 | } | |
1363 | } | |
1364 | ||
602adf40 | 1365 | /* |
f7760dad AE |
1366 | * Clone a portion of a bio, starting at the given byte offset |
1367 | * and continuing for the number of bytes indicated. | |
602adf40 | 1368 | */ |
f7760dad AE |
1369 | static struct bio *bio_clone_range(struct bio *bio_src, |
1370 | unsigned int offset, | |
1371 | unsigned int len, | |
1372 | gfp_t gfpmask) | |
602adf40 | 1373 | { |
f7760dad AE |
1374 | struct bio *bio; |
1375 | ||
5341a627 | 1376 | bio = bio_clone(bio_src, gfpmask); |
f7760dad AE |
1377 | if (!bio) |
1378 | return NULL; /* ENOMEM */ | |
602adf40 | 1379 | |
5341a627 | 1380 | bio_advance(bio, offset); |
4f024f37 | 1381 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1382 | |
1383 | return bio; | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Clone a portion of a bio chain, starting at the given byte offset | |
1388 | * into the first bio in the source chain and continuing for the | |
1389 | * number of bytes indicated. The result is another bio chain of | |
1390 | * exactly the given length, or a null pointer on error. | |
1391 | * | |
1392 | * The bio_src and offset parameters are both in-out. On entry they | |
1393 | * refer to the first source bio and the offset into that bio where | |
1394 | * the start of data to be cloned is located. | |
1395 | * | |
1396 | * On return, bio_src is updated to refer to the bio in the source | |
1397 | * chain that contains first un-cloned byte, and *offset will | |
1398 | * contain the offset of that byte within that bio. | |
1399 | */ | |
1400 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1401 | unsigned int *offset, | |
1402 | unsigned int len, | |
1403 | gfp_t gfpmask) | |
1404 | { | |
1405 | struct bio *bi = *bio_src; | |
1406 | unsigned int off = *offset; | |
1407 | struct bio *chain = NULL; | |
1408 | struct bio **end; | |
1409 | ||
1410 | /* Build up a chain of clone bios up to the limit */ | |
1411 | ||
4f024f37 | 1412 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1413 | return NULL; /* Nothing to clone */ |
602adf40 | 1414 | |
f7760dad AE |
1415 | end = &chain; |
1416 | while (len) { | |
1417 | unsigned int bi_size; | |
1418 | struct bio *bio; | |
1419 | ||
f5400b7a AE |
1420 | if (!bi) { |
1421 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1422 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1423 | } |
4f024f37 | 1424 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1425 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1426 | if (!bio) | |
1427 | goto out_err; /* ENOMEM */ | |
1428 | ||
1429 | *end = bio; | |
1430 | end = &bio->bi_next; | |
602adf40 | 1431 | |
f7760dad | 1432 | off += bi_size; |
4f024f37 | 1433 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1434 | bi = bi->bi_next; |
1435 | off = 0; | |
1436 | } | |
1437 | len -= bi_size; | |
1438 | } | |
1439 | *bio_src = bi; | |
1440 | *offset = off; | |
1441 | ||
1442 | return chain; | |
1443 | out_err: | |
1444 | bio_chain_put(chain); | |
602adf40 | 1445 | |
602adf40 YS |
1446 | return NULL; |
1447 | } | |
1448 | ||
926f9b3f AE |
1449 | /* |
1450 | * The default/initial value for all object request flags is 0. For | |
1451 | * each flag, once its value is set to 1 it is never reset to 0 | |
1452 | * again. | |
1453 | */ | |
57acbaa7 | 1454 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1455 | { |
57acbaa7 | 1456 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1457 | struct rbd_device *rbd_dev; |
1458 | ||
57acbaa7 | 1459 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1460 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1461 | obj_request); |
1462 | } | |
1463 | } | |
1464 | ||
57acbaa7 | 1465 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1466 | { |
1467 | smp_mb(); | |
57acbaa7 | 1468 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1469 | } |
1470 | ||
57acbaa7 | 1471 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1472 | { |
57acbaa7 AE |
1473 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1474 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1475 | |
57acbaa7 AE |
1476 | if (obj_request_img_data_test(obj_request)) |
1477 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1478 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1479 | obj_request); |
1480 | } | |
1481 | } | |
1482 | ||
57acbaa7 | 1483 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1484 | { |
1485 | smp_mb(); | |
57acbaa7 | 1486 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1487 | } |
1488 | ||
5679c59f AE |
1489 | /* |
1490 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1491 | * flag. The latter is set based on the "exists" value provided. | |
1492 | * | |
1493 | * Note that for our purposes once an object exists it never goes | |
1494 | * away again. It's possible that the response from two existence | |
1495 | * checks are separated by the creation of the target object, and | |
1496 | * the first ("doesn't exist") response arrives *after* the second | |
1497 | * ("does exist"). In that case we ignore the second one. | |
1498 | */ | |
1499 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1500 | bool exists) | |
1501 | { | |
1502 | if (exists) | |
1503 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1504 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1505 | smp_mb(); | |
1506 | } | |
1507 | ||
1508 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1509 | { | |
1510 | smp_mb(); | |
1511 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1512 | } | |
1513 | ||
1514 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1515 | { | |
1516 | smp_mb(); | |
1517 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1518 | } | |
1519 | ||
9638556a ID |
1520 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1521 | { | |
1522 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1523 | ||
1524 | return obj_request->img_offset < | |
1525 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1526 | } | |
1527 | ||
bf0d5f50 AE |
1528 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1529 | { | |
37206ee5 AE |
1530 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1531 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1532 | kref_get(&obj_request->kref); |
1533 | } | |
1534 | ||
1535 | static void rbd_obj_request_destroy(struct kref *kref); | |
1536 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1537 | { | |
1538 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1539 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1540 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1541 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1542 | } | |
1543 | ||
0f2d5be7 AE |
1544 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1545 | { | |
1546 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
1547 | atomic_read(&img_request->kref.refcount)); | |
1548 | kref_get(&img_request->kref); | |
1549 | } | |
1550 | ||
e93f3152 AE |
1551 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1552 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1553 | static void rbd_img_request_destroy(struct kref *kref); |
1554 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1555 | { | |
1556 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1557 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1558 | atomic_read(&img_request->kref.refcount)); | |
e93f3152 AE |
1559 | if (img_request_child_test(img_request)) |
1560 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1561 | else | |
1562 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1563 | } |
1564 | ||
1565 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1566 | struct rbd_obj_request *obj_request) | |
1567 | { | |
25dcf954 AE |
1568 | rbd_assert(obj_request->img_request == NULL); |
1569 | ||
b155e86c | 1570 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1571 | obj_request->img_request = img_request; |
25dcf954 | 1572 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1573 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1574 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1575 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1576 | img_request->obj_request_count++; |
1577 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1578 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1579 | obj_request->which); | |
bf0d5f50 AE |
1580 | } |
1581 | ||
1582 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1583 | struct rbd_obj_request *obj_request) | |
1584 | { | |
1585 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1586 | |
37206ee5 AE |
1587 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1588 | obj_request->which); | |
bf0d5f50 | 1589 | list_del(&obj_request->links); |
25dcf954 AE |
1590 | rbd_assert(img_request->obj_request_count > 0); |
1591 | img_request->obj_request_count--; | |
1592 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1593 | obj_request->which = BAD_WHICH; | |
6365d33a | 1594 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1595 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1596 | obj_request->img_request = NULL; |
25dcf954 | 1597 | obj_request->callback = NULL; |
bf0d5f50 AE |
1598 | rbd_obj_request_put(obj_request); |
1599 | } | |
1600 | ||
1601 | static bool obj_request_type_valid(enum obj_request_type type) | |
1602 | { | |
1603 | switch (type) { | |
9969ebc5 | 1604 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1605 | case OBJ_REQUEST_BIO: |
788e2df3 | 1606 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1607 | return true; |
1608 | default: | |
1609 | return false; | |
1610 | } | |
1611 | } | |
1612 | ||
bf0d5f50 AE |
1613 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1614 | struct rbd_obj_request *obj_request) | |
1615 | { | |
71c20a06 | 1616 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1617 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1618 | } | |
1619 | ||
71c20a06 ID |
1620 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
1621 | { | |
1622 | dout("%s %p\n", __func__, obj_request); | |
1623 | ceph_osdc_cancel_request(obj_request->osd_req); | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * Wait for an object request to complete. If interrupted, cancel the | |
1628 | * underlying osd request. | |
2894e1d7 ID |
1629 | * |
1630 | * @timeout: in jiffies, 0 means "wait forever" | |
71c20a06 | 1631 | */ |
2894e1d7 ID |
1632 | static int __rbd_obj_request_wait(struct rbd_obj_request *obj_request, |
1633 | unsigned long timeout) | |
71c20a06 | 1634 | { |
2894e1d7 | 1635 | long ret; |
71c20a06 ID |
1636 | |
1637 | dout("%s %p\n", __func__, obj_request); | |
2894e1d7 ID |
1638 | ret = wait_for_completion_interruptible_timeout( |
1639 | &obj_request->completion, | |
1640 | ceph_timeout_jiffies(timeout)); | |
1641 | if (ret <= 0) { | |
1642 | if (ret == 0) | |
1643 | ret = -ETIMEDOUT; | |
71c20a06 | 1644 | rbd_obj_request_end(obj_request); |
2894e1d7 ID |
1645 | } else { |
1646 | ret = 0; | |
71c20a06 ID |
1647 | } |
1648 | ||
2894e1d7 ID |
1649 | dout("%s %p ret %d\n", __func__, obj_request, (int)ret); |
1650 | return ret; | |
1651 | } | |
1652 | ||
1653 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1654 | { | |
1655 | return __rbd_obj_request_wait(obj_request, 0); | |
1656 | } | |
1657 | ||
bf0d5f50 AE |
1658 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1659 | { | |
55f27e09 | 1660 | |
37206ee5 | 1661 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1662 | |
1663 | /* | |
1664 | * If no error occurred, compute the aggregate transfer | |
1665 | * count for the image request. We could instead use | |
1666 | * atomic64_cmpxchg() to update it as each object request | |
1667 | * completes; not clear which way is better off hand. | |
1668 | */ | |
1669 | if (!img_request->result) { | |
1670 | struct rbd_obj_request *obj_request; | |
1671 | u64 xferred = 0; | |
1672 | ||
1673 | for_each_obj_request(img_request, obj_request) | |
1674 | xferred += obj_request->xferred; | |
1675 | img_request->xferred = xferred; | |
1676 | } | |
1677 | ||
bf0d5f50 AE |
1678 | if (img_request->callback) |
1679 | img_request->callback(img_request); | |
1680 | else | |
1681 | rbd_img_request_put(img_request); | |
1682 | } | |
1683 | ||
0c425248 AE |
1684 | /* |
1685 | * The default/initial value for all image request flags is 0. Each | |
1686 | * is conditionally set to 1 at image request initialization time | |
1687 | * and currently never change thereafter. | |
1688 | */ | |
1689 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1690 | { | |
1691 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1692 | smp_mb(); | |
1693 | } | |
1694 | ||
1695 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1696 | { | |
1697 | smp_mb(); | |
1698 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1699 | } | |
1700 | ||
90e98c52 GZ |
1701 | /* |
1702 | * Set the discard flag when the img_request is an discard request | |
1703 | */ | |
1704 | static void img_request_discard_set(struct rbd_img_request *img_request) | |
1705 | { | |
1706 | set_bit(IMG_REQ_DISCARD, &img_request->flags); | |
1707 | smp_mb(); | |
1708 | } | |
1709 | ||
1710 | static bool img_request_discard_test(struct rbd_img_request *img_request) | |
1711 | { | |
1712 | smp_mb(); | |
1713 | return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; | |
1714 | } | |
1715 | ||
9849e986 AE |
1716 | static void img_request_child_set(struct rbd_img_request *img_request) |
1717 | { | |
1718 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1719 | smp_mb(); | |
1720 | } | |
1721 | ||
e93f3152 AE |
1722 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1723 | { | |
1724 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1725 | smp_mb(); | |
1726 | } | |
1727 | ||
9849e986 AE |
1728 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1729 | { | |
1730 | smp_mb(); | |
1731 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1732 | } | |
1733 | ||
d0b2e944 AE |
1734 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1735 | { | |
1736 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1737 | smp_mb(); | |
1738 | } | |
1739 | ||
a2acd00e AE |
1740 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1741 | { | |
1742 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1743 | smp_mb(); | |
1744 | } | |
1745 | ||
d0b2e944 AE |
1746 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1747 | { | |
1748 | smp_mb(); | |
1749 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1750 | } | |
1751 | ||
3b434a2a JD |
1752 | static enum obj_operation_type |
1753 | rbd_img_request_op_type(struct rbd_img_request *img_request) | |
1754 | { | |
1755 | if (img_request_write_test(img_request)) | |
1756 | return OBJ_OP_WRITE; | |
1757 | else if (img_request_discard_test(img_request)) | |
1758 | return OBJ_OP_DISCARD; | |
1759 | else | |
1760 | return OBJ_OP_READ; | |
1761 | } | |
1762 | ||
6e2a4505 AE |
1763 | static void |
1764 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1765 | { | |
b9434c5b AE |
1766 | u64 xferred = obj_request->xferred; |
1767 | u64 length = obj_request->length; | |
1768 | ||
6e2a4505 AE |
1769 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1770 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1771 | xferred, length); |
6e2a4505 | 1772 | /* |
17c1cc1d JD |
1773 | * ENOENT means a hole in the image. We zero-fill the entire |
1774 | * length of the request. A short read also implies zero-fill | |
1775 | * to the end of the request. An error requires the whole | |
1776 | * length of the request to be reported finished with an error | |
1777 | * to the block layer. In each case we update the xferred | |
1778 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1779 | */ |
b9434c5b | 1780 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1781 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1782 | if (obj_request->type == OBJ_REQUEST_BIO) |
1783 | zero_bio_chain(obj_request->bio_list, 0); | |
1784 | else | |
1785 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1786 | obj_request->result = 0; |
b9434c5b AE |
1787 | } else if (xferred < length && !obj_request->result) { |
1788 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1789 | zero_bio_chain(obj_request->bio_list, xferred); | |
1790 | else | |
1791 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1792 | } |
17c1cc1d | 1793 | obj_request->xferred = length; |
6e2a4505 AE |
1794 | obj_request_done_set(obj_request); |
1795 | } | |
1796 | ||
bf0d5f50 AE |
1797 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1798 | { | |
37206ee5 AE |
1799 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1800 | obj_request->callback); | |
bf0d5f50 AE |
1801 | if (obj_request->callback) |
1802 | obj_request->callback(obj_request); | |
788e2df3 AE |
1803 | else |
1804 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1805 | } |
1806 | ||
c47f9371 | 1807 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1808 | { |
57acbaa7 | 1809 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1810 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1811 | bool layered = false; |
1812 | ||
1813 | if (obj_request_img_data_test(obj_request)) { | |
1814 | img_request = obj_request->img_request; | |
1815 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1816 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1817 | } |
8b3e1a56 AE |
1818 | |
1819 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1820 | obj_request, img_request, obj_request->result, | |
1821 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1822 | if (layered && obj_request->result == -ENOENT && |
1823 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1824 | rbd_img_parent_read(obj_request); |
1825 | else if (img_request) | |
6e2a4505 AE |
1826 | rbd_img_obj_request_read_callback(obj_request); |
1827 | else | |
1828 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1829 | } |
1830 | ||
c47f9371 | 1831 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1832 | { |
1b83bef2 SW |
1833 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1834 | obj_request->result, obj_request->length); | |
1835 | /* | |
8b3e1a56 AE |
1836 | * There is no such thing as a successful short write. Set |
1837 | * it to our originally-requested length. | |
1b83bef2 SW |
1838 | */ |
1839 | obj_request->xferred = obj_request->length; | |
07741308 | 1840 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1841 | } |
1842 | ||
90e98c52 GZ |
1843 | static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
1844 | { | |
1845 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, | |
1846 | obj_request->result, obj_request->length); | |
1847 | /* | |
1848 | * There is no such thing as a successful short discard. Set | |
1849 | * it to our originally-requested length. | |
1850 | */ | |
1851 | obj_request->xferred = obj_request->length; | |
d0265de7 JD |
1852 | /* discarding a non-existent object is not a problem */ |
1853 | if (obj_request->result == -ENOENT) | |
1854 | obj_request->result = 0; | |
90e98c52 GZ |
1855 | obj_request_done_set(obj_request); |
1856 | } | |
1857 | ||
fbfab539 AE |
1858 | /* |
1859 | * For a simple stat call there's nothing to do. We'll do more if | |
1860 | * this is part of a write sequence for a layered image. | |
1861 | */ | |
c47f9371 | 1862 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1863 | { |
37206ee5 | 1864 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1865 | obj_request_done_set(obj_request); |
1866 | } | |
1867 | ||
2761713d ID |
1868 | static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) |
1869 | { | |
1870 | dout("%s: obj %p\n", __func__, obj_request); | |
1871 | ||
1872 | if (obj_request_img_data_test(obj_request)) | |
1873 | rbd_osd_copyup_callback(obj_request); | |
1874 | else | |
1875 | obj_request_done_set(obj_request); | |
1876 | } | |
1877 | ||
85e084fe | 1878 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 AE |
1879 | { |
1880 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1881 | u16 opcode; |
1882 | ||
85e084fe | 1883 | dout("%s: osd_req %p\n", __func__, osd_req); |
bf0d5f50 | 1884 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1885 | if (obj_request_img_data_test(obj_request)) { |
1886 | rbd_assert(obj_request->img_request); | |
1887 | rbd_assert(obj_request->which != BAD_WHICH); | |
1888 | } else { | |
1889 | rbd_assert(obj_request->which == BAD_WHICH); | |
1890 | } | |
bf0d5f50 | 1891 | |
1b83bef2 SW |
1892 | if (osd_req->r_result < 0) |
1893 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1894 | |
c47f9371 AE |
1895 | /* |
1896 | * We support a 64-bit length, but ultimately it has to be | |
7ad18afa CH |
1897 | * passed to the block layer, which just supports a 32-bit |
1898 | * length field. | |
c47f9371 | 1899 | */ |
7665d85b | 1900 | obj_request->xferred = osd_req->r_ops[0].outdata_len; |
8b3e1a56 | 1901 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1902 | |
79528734 | 1903 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1904 | switch (opcode) { |
1905 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1906 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1907 | break; |
0ccd5926 | 1908 | case CEPH_OSD_OP_SETALLOCHINT: |
e30b7577 ID |
1909 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE || |
1910 | osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL); | |
0ccd5926 | 1911 | /* fall through */ |
bf0d5f50 | 1912 | case CEPH_OSD_OP_WRITE: |
e30b7577 | 1913 | case CEPH_OSD_OP_WRITEFULL: |
c47f9371 | 1914 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1915 | break; |
fbfab539 | 1916 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1917 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1918 | break; |
90e98c52 GZ |
1919 | case CEPH_OSD_OP_DELETE: |
1920 | case CEPH_OSD_OP_TRUNCATE: | |
1921 | case CEPH_OSD_OP_ZERO: | |
1922 | rbd_osd_discard_callback(obj_request); | |
1923 | break; | |
36be9a76 | 1924 | case CEPH_OSD_OP_CALL: |
2761713d ID |
1925 | rbd_osd_call_callback(obj_request); |
1926 | break; | |
bf0d5f50 | 1927 | default: |
9584d508 | 1928 | rbd_warn(NULL, "%s: unsupported op %hu", |
bf0d5f50 AE |
1929 | obj_request->object_name, (unsigned short) opcode); |
1930 | break; | |
1931 | } | |
1932 | ||
07741308 | 1933 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1934 | rbd_obj_request_complete(obj_request); |
1935 | } | |
1936 | ||
9d4df01f | 1937 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1938 | { |
1939 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1940 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1941 | |
bb873b53 ID |
1942 | if (img_request) |
1943 | osd_req->r_snapid = img_request->snap_id; | |
9d4df01f AE |
1944 | } |
1945 | ||
1946 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1947 | { | |
9d4df01f | 1948 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1949 | |
bb873b53 ID |
1950 | osd_req->r_mtime = CURRENT_TIME; |
1951 | osd_req->r_data_offset = obj_request->offset; | |
430c28c3 AE |
1952 | } |
1953 | ||
0ccd5926 ID |
1954 | /* |
1955 | * Create an osd request. A read request has one osd op (read). | |
1956 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1957 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1958 | * technically osd watch is a write request, hence this distinction.) | |
1959 | */ | |
bf0d5f50 AE |
1960 | static struct ceph_osd_request *rbd_osd_req_create( |
1961 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1962 | enum obj_operation_type op_type, |
deb236b3 | 1963 | unsigned int num_ops, |
430c28c3 | 1964 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1965 | { |
bf0d5f50 AE |
1966 | struct ceph_snap_context *snapc = NULL; |
1967 | struct ceph_osd_client *osdc; | |
1968 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1969 | |
90e98c52 GZ |
1970 | if (obj_request_img_data_test(obj_request) && |
1971 | (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { | |
6365d33a | 1972 | struct rbd_img_request *img_request = obj_request->img_request; |
90e98c52 GZ |
1973 | if (op_type == OBJ_OP_WRITE) { |
1974 | rbd_assert(img_request_write_test(img_request)); | |
1975 | } else { | |
1976 | rbd_assert(img_request_discard_test(img_request)); | |
1977 | } | |
6d2940c8 | 1978 | snapc = img_request->snapc; |
bf0d5f50 AE |
1979 | } |
1980 | ||
6d2940c8 | 1981 | rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
deb236b3 ID |
1982 | |
1983 | /* Allocate and initialize the request, for the num_ops ops */ | |
bf0d5f50 AE |
1984 | |
1985 | osdc = &rbd_dev->rbd_client->client->osdc; | |
deb236b3 | 1986 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
2224d879 | 1987 | GFP_NOIO); |
bf0d5f50 | 1988 | if (!osd_req) |
13d1ad16 | 1989 | goto fail; |
bf0d5f50 | 1990 | |
90e98c52 | 1991 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
bf0d5f50 | 1992 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1993 | else |
bf0d5f50 | 1994 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1995 | |
1996 | osd_req->r_callback = rbd_osd_req_callback; | |
1997 | osd_req->r_priv = obj_request; | |
1998 | ||
7627151e | 1999 | osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
d30291b9 ID |
2000 | if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s", |
2001 | obj_request->object_name)) | |
2002 | goto fail; | |
bf0d5f50 | 2003 | |
13d1ad16 ID |
2004 | if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO)) |
2005 | goto fail; | |
2006 | ||
bf0d5f50 | 2007 | return osd_req; |
13d1ad16 ID |
2008 | |
2009 | fail: | |
2010 | ceph_osdc_put_request(osd_req); | |
2011 | return NULL; | |
bf0d5f50 AE |
2012 | } |
2013 | ||
0eefd470 | 2014 | /* |
d3246fb0 JD |
2015 | * Create a copyup osd request based on the information in the object |
2016 | * request supplied. A copyup request has two or three osd ops, a | |
2017 | * copyup method call, potentially a hint op, and a write or truncate | |
2018 | * or zero op. | |
0eefd470 AE |
2019 | */ |
2020 | static struct ceph_osd_request * | |
2021 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
2022 | { | |
2023 | struct rbd_img_request *img_request; | |
2024 | struct ceph_snap_context *snapc; | |
2025 | struct rbd_device *rbd_dev; | |
2026 | struct ceph_osd_client *osdc; | |
2027 | struct ceph_osd_request *osd_req; | |
d3246fb0 | 2028 | int num_osd_ops = 3; |
0eefd470 AE |
2029 | |
2030 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2031 | img_request = obj_request->img_request; | |
2032 | rbd_assert(img_request); | |
d3246fb0 JD |
2033 | rbd_assert(img_request_write_test(img_request) || |
2034 | img_request_discard_test(img_request)); | |
0eefd470 | 2035 | |
d3246fb0 JD |
2036 | if (img_request_discard_test(img_request)) |
2037 | num_osd_ops = 2; | |
2038 | ||
2039 | /* Allocate and initialize the request, for all the ops */ | |
0eefd470 AE |
2040 | |
2041 | snapc = img_request->snapc; | |
2042 | rbd_dev = img_request->rbd_dev; | |
2043 | osdc = &rbd_dev->rbd_client->client->osdc; | |
d3246fb0 | 2044 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops, |
2224d879 | 2045 | false, GFP_NOIO); |
0eefd470 | 2046 | if (!osd_req) |
13d1ad16 | 2047 | goto fail; |
0eefd470 AE |
2048 | |
2049 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
2050 | osd_req->r_callback = rbd_osd_req_callback; | |
2051 | osd_req->r_priv = obj_request; | |
2052 | ||
7627151e | 2053 | osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
d30291b9 ID |
2054 | if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s", |
2055 | obj_request->object_name)) | |
2056 | goto fail; | |
0eefd470 | 2057 | |
13d1ad16 ID |
2058 | if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO)) |
2059 | goto fail; | |
2060 | ||
0eefd470 | 2061 | return osd_req; |
13d1ad16 ID |
2062 | |
2063 | fail: | |
2064 | ceph_osdc_put_request(osd_req); | |
2065 | return NULL; | |
0eefd470 AE |
2066 | } |
2067 | ||
2068 | ||
bf0d5f50 AE |
2069 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
2070 | { | |
2071 | ceph_osdc_put_request(osd_req); | |
2072 | } | |
2073 | ||
2074 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
2075 | ||
2076 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
2077 | u64 offset, u64 length, | |
2078 | enum obj_request_type type) | |
2079 | { | |
2080 | struct rbd_obj_request *obj_request; | |
2081 | size_t size; | |
2082 | char *name; | |
2083 | ||
2084 | rbd_assert(obj_request_type_valid(type)); | |
2085 | ||
2086 | size = strlen(object_name) + 1; | |
5a60e876 | 2087 | name = kmalloc(size, GFP_NOIO); |
f907ad55 | 2088 | if (!name) |
bf0d5f50 AE |
2089 | return NULL; |
2090 | ||
5a60e876 | 2091 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
f907ad55 AE |
2092 | if (!obj_request) { |
2093 | kfree(name); | |
2094 | return NULL; | |
2095 | } | |
2096 | ||
bf0d5f50 AE |
2097 | obj_request->object_name = memcpy(name, object_name, size); |
2098 | obj_request->offset = offset; | |
2099 | obj_request->length = length; | |
926f9b3f | 2100 | obj_request->flags = 0; |
bf0d5f50 AE |
2101 | obj_request->which = BAD_WHICH; |
2102 | obj_request->type = type; | |
2103 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 2104 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
2105 | kref_init(&obj_request->kref); |
2106 | ||
37206ee5 AE |
2107 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
2108 | offset, length, (int)type, obj_request); | |
2109 | ||
bf0d5f50 AE |
2110 | return obj_request; |
2111 | } | |
2112 | ||
2113 | static void rbd_obj_request_destroy(struct kref *kref) | |
2114 | { | |
2115 | struct rbd_obj_request *obj_request; | |
2116 | ||
2117 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
2118 | ||
37206ee5 AE |
2119 | dout("%s: obj %p\n", __func__, obj_request); |
2120 | ||
bf0d5f50 AE |
2121 | rbd_assert(obj_request->img_request == NULL); |
2122 | rbd_assert(obj_request->which == BAD_WHICH); | |
2123 | ||
2124 | if (obj_request->osd_req) | |
2125 | rbd_osd_req_destroy(obj_request->osd_req); | |
2126 | ||
2127 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
2128 | switch (obj_request->type) { | |
9969ebc5 AE |
2129 | case OBJ_REQUEST_NODATA: |
2130 | break; /* Nothing to do */ | |
bf0d5f50 AE |
2131 | case OBJ_REQUEST_BIO: |
2132 | if (obj_request->bio_list) | |
2133 | bio_chain_put(obj_request->bio_list); | |
2134 | break; | |
788e2df3 AE |
2135 | case OBJ_REQUEST_PAGES: |
2136 | if (obj_request->pages) | |
2137 | ceph_release_page_vector(obj_request->pages, | |
2138 | obj_request->page_count); | |
2139 | break; | |
bf0d5f50 AE |
2140 | } |
2141 | ||
f907ad55 | 2142 | kfree(obj_request->object_name); |
868311b1 AE |
2143 | obj_request->object_name = NULL; |
2144 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
2145 | } |
2146 | ||
fb65d228 AE |
2147 | /* It's OK to call this for a device with no parent */ |
2148 | ||
2149 | static void rbd_spec_put(struct rbd_spec *spec); | |
2150 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
2151 | { | |
2152 | rbd_dev_remove_parent(rbd_dev); | |
2153 | rbd_spec_put(rbd_dev->parent_spec); | |
2154 | rbd_dev->parent_spec = NULL; | |
2155 | rbd_dev->parent_overlap = 0; | |
2156 | } | |
2157 | ||
a2acd00e AE |
2158 | /* |
2159 | * Parent image reference counting is used to determine when an | |
2160 | * image's parent fields can be safely torn down--after there are no | |
2161 | * more in-flight requests to the parent image. When the last | |
2162 | * reference is dropped, cleaning them up is safe. | |
2163 | */ | |
2164 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2165 | { | |
2166 | int counter; | |
2167 | ||
2168 | if (!rbd_dev->parent_spec) | |
2169 | return; | |
2170 | ||
2171 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2172 | if (counter > 0) | |
2173 | return; | |
2174 | ||
2175 | /* Last reference; clean up parent data structures */ | |
2176 | ||
2177 | if (!counter) | |
2178 | rbd_dev_unparent(rbd_dev); | |
2179 | else | |
9584d508 | 2180 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
2181 | } |
2182 | ||
2183 | /* | |
2184 | * If an image has a non-zero parent overlap, get a reference to its | |
2185 | * parent. | |
2186 | * | |
2187 | * Returns true if the rbd device has a parent with a non-zero | |
2188 | * overlap and a reference for it was successfully taken, or | |
2189 | * false otherwise. | |
2190 | */ | |
2191 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2192 | { | |
ae43e9d0 | 2193 | int counter = 0; |
a2acd00e AE |
2194 | |
2195 | if (!rbd_dev->parent_spec) | |
2196 | return false; | |
2197 | ||
ae43e9d0 ID |
2198 | down_read(&rbd_dev->header_rwsem); |
2199 | if (rbd_dev->parent_overlap) | |
2200 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2201 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
2202 | |
2203 | if (counter < 0) | |
9584d508 | 2204 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 2205 | |
ae43e9d0 | 2206 | return counter > 0; |
a2acd00e AE |
2207 | } |
2208 | ||
bf0d5f50 AE |
2209 | /* |
2210 | * Caller is responsible for filling in the list of object requests | |
2211 | * that comprises the image request, and the Linux request pointer | |
2212 | * (if there is one). | |
2213 | */ | |
cc344fa1 AE |
2214 | static struct rbd_img_request *rbd_img_request_create( |
2215 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2216 | u64 offset, u64 length, |
6d2940c8 | 2217 | enum obj_operation_type op_type, |
4e752f0a | 2218 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
2219 | { |
2220 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2221 | |
7a716aac | 2222 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
2223 | if (!img_request) |
2224 | return NULL; | |
2225 | ||
bf0d5f50 AE |
2226 | img_request->rq = NULL; |
2227 | img_request->rbd_dev = rbd_dev; | |
2228 | img_request->offset = offset; | |
2229 | img_request->length = length; | |
0c425248 | 2230 | img_request->flags = 0; |
90e98c52 GZ |
2231 | if (op_type == OBJ_OP_DISCARD) { |
2232 | img_request_discard_set(img_request); | |
2233 | img_request->snapc = snapc; | |
2234 | } else if (op_type == OBJ_OP_WRITE) { | |
0c425248 | 2235 | img_request_write_set(img_request); |
4e752f0a | 2236 | img_request->snapc = snapc; |
0c425248 | 2237 | } else { |
bf0d5f50 | 2238 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2239 | } |
a2acd00e | 2240 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2241 | img_request_layered_set(img_request); |
bf0d5f50 AE |
2242 | spin_lock_init(&img_request->completion_lock); |
2243 | img_request->next_completion = 0; | |
2244 | img_request->callback = NULL; | |
a5a337d4 | 2245 | img_request->result = 0; |
bf0d5f50 AE |
2246 | img_request->obj_request_count = 0; |
2247 | INIT_LIST_HEAD(&img_request->obj_requests); | |
2248 | kref_init(&img_request->kref); | |
2249 | ||
37206ee5 | 2250 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
6d2940c8 | 2251 | obj_op_name(op_type), offset, length, img_request); |
37206ee5 | 2252 | |
bf0d5f50 AE |
2253 | return img_request; |
2254 | } | |
2255 | ||
2256 | static void rbd_img_request_destroy(struct kref *kref) | |
2257 | { | |
2258 | struct rbd_img_request *img_request; | |
2259 | struct rbd_obj_request *obj_request; | |
2260 | struct rbd_obj_request *next_obj_request; | |
2261 | ||
2262 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2263 | ||
37206ee5 AE |
2264 | dout("%s: img %p\n", __func__, img_request); |
2265 | ||
bf0d5f50 AE |
2266 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2267 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2268 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2269 | |
a2acd00e AE |
2270 | if (img_request_layered_test(img_request)) { |
2271 | img_request_layered_clear(img_request); | |
2272 | rbd_dev_parent_put(img_request->rbd_dev); | |
2273 | } | |
2274 | ||
bef95455 JD |
2275 | if (img_request_write_test(img_request) || |
2276 | img_request_discard_test(img_request)) | |
812164f8 | 2277 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2278 | |
1c2a9dfe | 2279 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2280 | } |
2281 | ||
e93f3152 AE |
2282 | static struct rbd_img_request *rbd_parent_request_create( |
2283 | struct rbd_obj_request *obj_request, | |
2284 | u64 img_offset, u64 length) | |
2285 | { | |
2286 | struct rbd_img_request *parent_request; | |
2287 | struct rbd_device *rbd_dev; | |
2288 | ||
2289 | rbd_assert(obj_request->img_request); | |
2290 | rbd_dev = obj_request->img_request->rbd_dev; | |
2291 | ||
4e752f0a | 2292 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
6d2940c8 | 2293 | length, OBJ_OP_READ, NULL); |
e93f3152 AE |
2294 | if (!parent_request) |
2295 | return NULL; | |
2296 | ||
2297 | img_request_child_set(parent_request); | |
2298 | rbd_obj_request_get(obj_request); | |
2299 | parent_request->obj_request = obj_request; | |
2300 | ||
2301 | return parent_request; | |
2302 | } | |
2303 | ||
2304 | static void rbd_parent_request_destroy(struct kref *kref) | |
2305 | { | |
2306 | struct rbd_img_request *parent_request; | |
2307 | struct rbd_obj_request *orig_request; | |
2308 | ||
2309 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2310 | orig_request = parent_request->obj_request; | |
2311 | ||
2312 | parent_request->obj_request = NULL; | |
2313 | rbd_obj_request_put(orig_request); | |
2314 | img_request_child_clear(parent_request); | |
2315 | ||
2316 | rbd_img_request_destroy(kref); | |
2317 | } | |
2318 | ||
1217857f AE |
2319 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2320 | { | |
6365d33a | 2321 | struct rbd_img_request *img_request; |
1217857f AE |
2322 | unsigned int xferred; |
2323 | int result; | |
8b3e1a56 | 2324 | bool more; |
1217857f | 2325 | |
6365d33a AE |
2326 | rbd_assert(obj_request_img_data_test(obj_request)); |
2327 | img_request = obj_request->img_request; | |
2328 | ||
1217857f AE |
2329 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2330 | xferred = (unsigned int)obj_request->xferred; | |
2331 | result = obj_request->result; | |
2332 | if (result) { | |
2333 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
6d2940c8 GZ |
2334 | enum obj_operation_type op_type; |
2335 | ||
90e98c52 GZ |
2336 | if (img_request_discard_test(img_request)) |
2337 | op_type = OBJ_OP_DISCARD; | |
2338 | else if (img_request_write_test(img_request)) | |
2339 | op_type = OBJ_OP_WRITE; | |
2340 | else | |
2341 | op_type = OBJ_OP_READ; | |
1217857f | 2342 | |
9584d508 | 2343 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
6d2940c8 GZ |
2344 | obj_op_name(op_type), obj_request->length, |
2345 | obj_request->img_offset, obj_request->offset); | |
9584d508 | 2346 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
2347 | result, xferred); |
2348 | if (!img_request->result) | |
2349 | img_request->result = result; | |
082a75da ID |
2350 | /* |
2351 | * Need to end I/O on the entire obj_request worth of | |
2352 | * bytes in case of error. | |
2353 | */ | |
2354 | xferred = obj_request->length; | |
1217857f AE |
2355 | } |
2356 | ||
f1a4739f AE |
2357 | /* Image object requests don't own their page array */ |
2358 | ||
2359 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
2360 | obj_request->pages = NULL; | |
2361 | obj_request->page_count = 0; | |
2362 | } | |
2363 | ||
8b3e1a56 AE |
2364 | if (img_request_child_test(img_request)) { |
2365 | rbd_assert(img_request->obj_request != NULL); | |
2366 | more = obj_request->which < img_request->obj_request_count - 1; | |
2367 | } else { | |
2368 | rbd_assert(img_request->rq != NULL); | |
7ad18afa CH |
2369 | |
2370 | more = blk_update_request(img_request->rq, result, xferred); | |
2371 | if (!more) | |
2372 | __blk_mq_end_request(img_request->rq, result); | |
8b3e1a56 AE |
2373 | } |
2374 | ||
2375 | return more; | |
1217857f AE |
2376 | } |
2377 | ||
2169238d AE |
2378 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2379 | { | |
2380 | struct rbd_img_request *img_request; | |
2381 | u32 which = obj_request->which; | |
2382 | bool more = true; | |
2383 | ||
6365d33a | 2384 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2385 | img_request = obj_request->img_request; |
2386 | ||
2387 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2388 | rbd_assert(img_request != NULL); | |
2169238d AE |
2389 | rbd_assert(img_request->obj_request_count > 0); |
2390 | rbd_assert(which != BAD_WHICH); | |
2391 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2392 | |
2393 | spin_lock_irq(&img_request->completion_lock); | |
2394 | if (which != img_request->next_completion) | |
2395 | goto out; | |
2396 | ||
2397 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2398 | rbd_assert(more); |
2399 | rbd_assert(which < img_request->obj_request_count); | |
2400 | ||
2401 | if (!obj_request_done_test(obj_request)) | |
2402 | break; | |
1217857f | 2403 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2404 | which++; |
2405 | } | |
2406 | ||
2407 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2408 | img_request->next_completion = which; | |
2409 | out: | |
2410 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2411 | rbd_img_request_put(img_request); |
2169238d AE |
2412 | |
2413 | if (!more) | |
2414 | rbd_img_request_complete(img_request); | |
2415 | } | |
2416 | ||
3b434a2a JD |
2417 | /* |
2418 | * Add individual osd ops to the given ceph_osd_request and prepare | |
2419 | * them for submission. num_ops is the current number of | |
2420 | * osd operations already to the object request. | |
2421 | */ | |
2422 | static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, | |
2423 | struct ceph_osd_request *osd_request, | |
2424 | enum obj_operation_type op_type, | |
2425 | unsigned int num_ops) | |
2426 | { | |
2427 | struct rbd_img_request *img_request = obj_request->img_request; | |
2428 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2429 | u64 object_size = rbd_obj_bytes(&rbd_dev->header); | |
2430 | u64 offset = obj_request->offset; | |
2431 | u64 length = obj_request->length; | |
2432 | u64 img_end; | |
2433 | u16 opcode; | |
2434 | ||
2435 | if (op_type == OBJ_OP_DISCARD) { | |
d3246fb0 JD |
2436 | if (!offset && length == object_size && |
2437 | (!img_request_layered_test(img_request) || | |
2438 | !obj_request_overlaps_parent(obj_request))) { | |
3b434a2a JD |
2439 | opcode = CEPH_OSD_OP_DELETE; |
2440 | } else if ((offset + length == object_size)) { | |
2441 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2442 | } else { | |
2443 | down_read(&rbd_dev->header_rwsem); | |
2444 | img_end = rbd_dev->header.image_size; | |
2445 | up_read(&rbd_dev->header_rwsem); | |
2446 | ||
2447 | if (obj_request->img_offset + length == img_end) | |
2448 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2449 | else | |
2450 | opcode = CEPH_OSD_OP_ZERO; | |
2451 | } | |
2452 | } else if (op_type == OBJ_OP_WRITE) { | |
e30b7577 ID |
2453 | if (!offset && length == object_size) |
2454 | opcode = CEPH_OSD_OP_WRITEFULL; | |
2455 | else | |
2456 | opcode = CEPH_OSD_OP_WRITE; | |
3b434a2a JD |
2457 | osd_req_op_alloc_hint_init(osd_request, num_ops, |
2458 | object_size, object_size); | |
2459 | num_ops++; | |
2460 | } else { | |
2461 | opcode = CEPH_OSD_OP_READ; | |
2462 | } | |
2463 | ||
7e868b6e | 2464 | if (opcode == CEPH_OSD_OP_DELETE) |
144cba14 | 2465 | osd_req_op_init(osd_request, num_ops, opcode, 0); |
7e868b6e ID |
2466 | else |
2467 | osd_req_op_extent_init(osd_request, num_ops, opcode, | |
2468 | offset, length, 0, 0); | |
2469 | ||
3b434a2a JD |
2470 | if (obj_request->type == OBJ_REQUEST_BIO) |
2471 | osd_req_op_extent_osd_data_bio(osd_request, num_ops, | |
2472 | obj_request->bio_list, length); | |
2473 | else if (obj_request->type == OBJ_REQUEST_PAGES) | |
2474 | osd_req_op_extent_osd_data_pages(osd_request, num_ops, | |
2475 | obj_request->pages, length, | |
2476 | offset & ~PAGE_MASK, false, false); | |
2477 | ||
2478 | /* Discards are also writes */ | |
2479 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) | |
2480 | rbd_osd_req_format_write(obj_request); | |
2481 | else | |
2482 | rbd_osd_req_format_read(obj_request); | |
2483 | } | |
2484 | ||
f1a4739f AE |
2485 | /* |
2486 | * Split up an image request into one or more object requests, each | |
2487 | * to a different object. The "type" parameter indicates whether | |
2488 | * "data_desc" is the pointer to the head of a list of bio | |
2489 | * structures, or the base of a page array. In either case this | |
2490 | * function assumes data_desc describes memory sufficient to hold | |
2491 | * all data described by the image request. | |
2492 | */ | |
2493 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2494 | enum obj_request_type type, | |
2495 | void *data_desc) | |
bf0d5f50 AE |
2496 | { |
2497 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2498 | struct rbd_obj_request *obj_request = NULL; | |
2499 | struct rbd_obj_request *next_obj_request; | |
a158073c | 2500 | struct bio *bio_list = NULL; |
f1a4739f | 2501 | unsigned int bio_offset = 0; |
a158073c | 2502 | struct page **pages = NULL; |
6d2940c8 | 2503 | enum obj_operation_type op_type; |
7da22d29 | 2504 | u64 img_offset; |
bf0d5f50 | 2505 | u64 resid; |
bf0d5f50 | 2506 | |
f1a4739f AE |
2507 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2508 | (int)type, data_desc); | |
37206ee5 | 2509 | |
7da22d29 | 2510 | img_offset = img_request->offset; |
bf0d5f50 | 2511 | resid = img_request->length; |
4dda41d3 | 2512 | rbd_assert(resid > 0); |
3b434a2a | 2513 | op_type = rbd_img_request_op_type(img_request); |
f1a4739f AE |
2514 | |
2515 | if (type == OBJ_REQUEST_BIO) { | |
2516 | bio_list = data_desc; | |
4f024f37 KO |
2517 | rbd_assert(img_offset == |
2518 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
90e98c52 | 2519 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2520 | pages = data_desc; |
2521 | } | |
2522 | ||
bf0d5f50 | 2523 | while (resid) { |
2fa12320 | 2524 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2525 | const char *object_name; |
bf0d5f50 AE |
2526 | u64 offset; |
2527 | u64 length; | |
2528 | ||
7da22d29 | 2529 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2530 | if (!object_name) |
2531 | goto out_unwind; | |
7da22d29 AE |
2532 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2533 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2534 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2535 | offset, length, type); |
78c2a44a AE |
2536 | /* object request has its own copy of the object name */ |
2537 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2538 | if (!obj_request) |
2539 | goto out_unwind; | |
62054da6 | 2540 | |
03507db6 JD |
2541 | /* |
2542 | * set obj_request->img_request before creating the | |
2543 | * osd_request so that it gets the right snapc | |
2544 | */ | |
2545 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2546 | |
f1a4739f AE |
2547 | if (type == OBJ_REQUEST_BIO) { |
2548 | unsigned int clone_size; | |
2549 | ||
2550 | rbd_assert(length <= (u64)UINT_MAX); | |
2551 | clone_size = (unsigned int)length; | |
2552 | obj_request->bio_list = | |
2553 | bio_chain_clone_range(&bio_list, | |
2554 | &bio_offset, | |
2555 | clone_size, | |
2224d879 | 2556 | GFP_NOIO); |
f1a4739f | 2557 | if (!obj_request->bio_list) |
62054da6 | 2558 | goto out_unwind; |
90e98c52 | 2559 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2560 | unsigned int page_count; |
2561 | ||
2562 | obj_request->pages = pages; | |
2563 | page_count = (u32)calc_pages_for(offset, length); | |
2564 | obj_request->page_count = page_count; | |
2565 | if ((offset + length) & ~PAGE_MASK) | |
2566 | page_count--; /* more on last page */ | |
2567 | pages += page_count; | |
2568 | } | |
bf0d5f50 | 2569 | |
6d2940c8 GZ |
2570 | osd_req = rbd_osd_req_create(rbd_dev, op_type, |
2571 | (op_type == OBJ_OP_WRITE) ? 2 : 1, | |
2572 | obj_request); | |
2fa12320 | 2573 | if (!osd_req) |
62054da6 | 2574 | goto out_unwind; |
3b434a2a | 2575 | |
2fa12320 | 2576 | obj_request->osd_req = osd_req; |
2169238d | 2577 | obj_request->callback = rbd_img_obj_callback; |
3b434a2a | 2578 | obj_request->img_offset = img_offset; |
9d4df01f | 2579 | |
3b434a2a | 2580 | rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
430c28c3 | 2581 | |
3b434a2a | 2582 | rbd_img_request_get(img_request); |
bf0d5f50 | 2583 | |
7da22d29 | 2584 | img_offset += length; |
bf0d5f50 AE |
2585 | resid -= length; |
2586 | } | |
2587 | ||
2588 | return 0; | |
2589 | ||
bf0d5f50 AE |
2590 | out_unwind: |
2591 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2592 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2593 | |
2594 | return -ENOMEM; | |
2595 | } | |
2596 | ||
0eefd470 | 2597 | static void |
2761713d | 2598 | rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) |
0eefd470 AE |
2599 | { |
2600 | struct rbd_img_request *img_request; | |
2601 | struct rbd_device *rbd_dev; | |
ebda6408 | 2602 | struct page **pages; |
0eefd470 AE |
2603 | u32 page_count; |
2604 | ||
2761713d ID |
2605 | dout("%s: obj %p\n", __func__, obj_request); |
2606 | ||
d3246fb0 JD |
2607 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
2608 | obj_request->type == OBJ_REQUEST_NODATA); | |
0eefd470 AE |
2609 | rbd_assert(obj_request_img_data_test(obj_request)); |
2610 | img_request = obj_request->img_request; | |
2611 | rbd_assert(img_request); | |
2612 | ||
2613 | rbd_dev = img_request->rbd_dev; | |
2614 | rbd_assert(rbd_dev); | |
0eefd470 | 2615 | |
ebda6408 AE |
2616 | pages = obj_request->copyup_pages; |
2617 | rbd_assert(pages != NULL); | |
0eefd470 | 2618 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2619 | page_count = obj_request->copyup_page_count; |
2620 | rbd_assert(page_count); | |
2621 | obj_request->copyup_page_count = 0; | |
2622 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2623 | |
2624 | /* | |
2625 | * We want the transfer count to reflect the size of the | |
2626 | * original write request. There is no such thing as a | |
2627 | * successful short write, so if the request was successful | |
2628 | * we can just set it to the originally-requested length. | |
2629 | */ | |
2630 | if (!obj_request->result) | |
2631 | obj_request->xferred = obj_request->length; | |
2632 | ||
2761713d | 2633 | obj_request_done_set(obj_request); |
0eefd470 AE |
2634 | } |
2635 | ||
3d7efd18 AE |
2636 | static void |
2637 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2638 | { | |
2639 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2640 | struct ceph_osd_request *osd_req; |
2641 | struct ceph_osd_client *osdc; | |
2642 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2643 | struct page **pages; |
d3246fb0 | 2644 | enum obj_operation_type op_type; |
ebda6408 | 2645 | u32 page_count; |
bbea1c1a | 2646 | int img_result; |
ebda6408 | 2647 | u64 parent_length; |
3d7efd18 AE |
2648 | |
2649 | rbd_assert(img_request_child_test(img_request)); | |
2650 | ||
2651 | /* First get what we need from the image request */ | |
2652 | ||
2653 | pages = img_request->copyup_pages; | |
2654 | rbd_assert(pages != NULL); | |
2655 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2656 | page_count = img_request->copyup_page_count; |
2657 | rbd_assert(page_count); | |
2658 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2659 | |
2660 | orig_request = img_request->obj_request; | |
2661 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2662 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2663 | img_result = img_request->result; |
ebda6408 AE |
2664 | parent_length = img_request->length; |
2665 | rbd_assert(parent_length == img_request->xferred); | |
91c6febb | 2666 | rbd_img_request_put(img_request); |
3d7efd18 | 2667 | |
91c6febb AE |
2668 | rbd_assert(orig_request->img_request); |
2669 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2670 | rbd_assert(rbd_dev); |
0eefd470 | 2671 | |
bbea1c1a AE |
2672 | /* |
2673 | * If the overlap has become 0 (most likely because the | |
2674 | * image has been flattened) we need to free the pages | |
2675 | * and re-submit the original write request. | |
2676 | */ | |
2677 | if (!rbd_dev->parent_overlap) { | |
2678 | struct ceph_osd_client *osdc; | |
3d7efd18 | 2679 | |
bbea1c1a AE |
2680 | ceph_release_page_vector(pages, page_count); |
2681 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2682 | img_result = rbd_obj_request_submit(osdc, orig_request); | |
2683 | if (!img_result) | |
2684 | return; | |
2685 | } | |
0eefd470 | 2686 | |
bbea1c1a | 2687 | if (img_result) |
0eefd470 | 2688 | goto out_err; |
0eefd470 | 2689 | |
8785b1d4 AE |
2690 | /* |
2691 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2692 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2693 | * request. Allocate the new copyup osd request for the |
2694 | * original request, and release the old one. | |
2695 | */ | |
bbea1c1a | 2696 | img_result = -ENOMEM; |
0eefd470 AE |
2697 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2698 | if (!osd_req) | |
2699 | goto out_err; | |
8785b1d4 | 2700 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2701 | orig_request->osd_req = osd_req; |
2702 | orig_request->copyup_pages = pages; | |
ebda6408 | 2703 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2704 | |
0eefd470 | 2705 | /* Initialize the copyup op */ |
3d7efd18 | 2706 | |
0eefd470 | 2707 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2708 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2709 | false, false); |
3d7efd18 | 2710 | |
d3246fb0 | 2711 | /* Add the other op(s) */ |
0eefd470 | 2712 | |
d3246fb0 JD |
2713 | op_type = rbd_img_request_op_type(orig_request->img_request); |
2714 | rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); | |
0eefd470 AE |
2715 | |
2716 | /* All set, send it off. */ | |
2717 | ||
0eefd470 | 2718 | osdc = &rbd_dev->rbd_client->client->osdc; |
bbea1c1a AE |
2719 | img_result = rbd_obj_request_submit(osdc, orig_request); |
2720 | if (!img_result) | |
0eefd470 AE |
2721 | return; |
2722 | out_err: | |
2723 | /* Record the error code and complete the request */ | |
2724 | ||
bbea1c1a | 2725 | orig_request->result = img_result; |
0eefd470 AE |
2726 | orig_request->xferred = 0; |
2727 | obj_request_done_set(orig_request); | |
2728 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2729 | } |
2730 | ||
2731 | /* | |
2732 | * Read from the parent image the range of data that covers the | |
2733 | * entire target of the given object request. This is used for | |
2734 | * satisfying a layered image write request when the target of an | |
2735 | * object request from the image request does not exist. | |
2736 | * | |
2737 | * A page array big enough to hold the returned data is allocated | |
2738 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2739 | * When the read completes, this page array will be transferred to | |
2740 | * the original object request for the copyup operation. | |
2741 | * | |
2742 | * If an error occurs, record it as the result of the original | |
2743 | * object request and mark it done so it gets completed. | |
2744 | */ | |
2745 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2746 | { | |
2747 | struct rbd_img_request *img_request = NULL; | |
2748 | struct rbd_img_request *parent_request = NULL; | |
2749 | struct rbd_device *rbd_dev; | |
2750 | u64 img_offset; | |
2751 | u64 length; | |
2752 | struct page **pages = NULL; | |
2753 | u32 page_count; | |
2754 | int result; | |
2755 | ||
2756 | rbd_assert(obj_request_img_data_test(obj_request)); | |
b91f09f1 | 2757 | rbd_assert(obj_request_type_valid(obj_request->type)); |
3d7efd18 AE |
2758 | |
2759 | img_request = obj_request->img_request; | |
2760 | rbd_assert(img_request != NULL); | |
2761 | rbd_dev = img_request->rbd_dev; | |
2762 | rbd_assert(rbd_dev->parent != NULL); | |
2763 | ||
2764 | /* | |
2765 | * Determine the byte range covered by the object in the | |
2766 | * child image to which the original request was to be sent. | |
2767 | */ | |
2768 | img_offset = obj_request->img_offset - obj_request->offset; | |
2769 | length = (u64)1 << rbd_dev->header.obj_order; | |
2770 | ||
a9e8ba2c AE |
2771 | /* |
2772 | * There is no defined parent data beyond the parent | |
2773 | * overlap, so limit what we read at that boundary if | |
2774 | * necessary. | |
2775 | */ | |
2776 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2777 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2778 | length = rbd_dev->parent_overlap - img_offset; | |
2779 | } | |
2780 | ||
3d7efd18 AE |
2781 | /* |
2782 | * Allocate a page array big enough to receive the data read | |
2783 | * from the parent. | |
2784 | */ | |
2785 | page_count = (u32)calc_pages_for(0, length); | |
2786 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2787 | if (IS_ERR(pages)) { | |
2788 | result = PTR_ERR(pages); | |
2789 | pages = NULL; | |
2790 | goto out_err; | |
2791 | } | |
2792 | ||
2793 | result = -ENOMEM; | |
e93f3152 AE |
2794 | parent_request = rbd_parent_request_create(obj_request, |
2795 | img_offset, length); | |
3d7efd18 AE |
2796 | if (!parent_request) |
2797 | goto out_err; | |
3d7efd18 AE |
2798 | |
2799 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2800 | if (result) | |
2801 | goto out_err; | |
2802 | parent_request->copyup_pages = pages; | |
ebda6408 | 2803 | parent_request->copyup_page_count = page_count; |
3d7efd18 AE |
2804 | |
2805 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2806 | result = rbd_img_request_submit(parent_request); | |
2807 | if (!result) | |
2808 | return 0; | |
2809 | ||
2810 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2811 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2812 | parent_request->obj_request = NULL; |
2813 | rbd_obj_request_put(obj_request); | |
2814 | out_err: | |
2815 | if (pages) | |
2816 | ceph_release_page_vector(pages, page_count); | |
2817 | if (parent_request) | |
2818 | rbd_img_request_put(parent_request); | |
2819 | obj_request->result = result; | |
2820 | obj_request->xferred = 0; | |
2821 | obj_request_done_set(obj_request); | |
2822 | ||
2823 | return result; | |
2824 | } | |
2825 | ||
c5b5ef6c AE |
2826 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2827 | { | |
c5b5ef6c | 2828 | struct rbd_obj_request *orig_request; |
638f5abe | 2829 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2830 | int result; |
2831 | ||
2832 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2833 | ||
2834 | /* | |
2835 | * All we need from the object request is the original | |
2836 | * request and the result of the STAT op. Grab those, then | |
2837 | * we're done with the request. | |
2838 | */ | |
2839 | orig_request = obj_request->obj_request; | |
2840 | obj_request->obj_request = NULL; | |
912c317d | 2841 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2842 | rbd_assert(orig_request); |
2843 | rbd_assert(orig_request->img_request); | |
2844 | ||
2845 | result = obj_request->result; | |
2846 | obj_request->result = 0; | |
2847 | ||
2848 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2849 | obj_request, orig_request, result, | |
2850 | obj_request->xferred, obj_request->length); | |
2851 | rbd_obj_request_put(obj_request); | |
2852 | ||
638f5abe AE |
2853 | /* |
2854 | * If the overlap has become 0 (most likely because the | |
2855 | * image has been flattened) we need to free the pages | |
2856 | * and re-submit the original write request. | |
2857 | */ | |
2858 | rbd_dev = orig_request->img_request->rbd_dev; | |
2859 | if (!rbd_dev->parent_overlap) { | |
2860 | struct ceph_osd_client *osdc; | |
2861 | ||
638f5abe AE |
2862 | osdc = &rbd_dev->rbd_client->client->osdc; |
2863 | result = rbd_obj_request_submit(osdc, orig_request); | |
2864 | if (!result) | |
2865 | return; | |
2866 | } | |
c5b5ef6c AE |
2867 | |
2868 | /* | |
2869 | * Our only purpose here is to determine whether the object | |
2870 | * exists, and we don't want to treat the non-existence as | |
2871 | * an error. If something else comes back, transfer the | |
2872 | * error to the original request and complete it now. | |
2873 | */ | |
2874 | if (!result) { | |
2875 | obj_request_existence_set(orig_request, true); | |
2876 | } else if (result == -ENOENT) { | |
2877 | obj_request_existence_set(orig_request, false); | |
2878 | } else if (result) { | |
2879 | orig_request->result = result; | |
3d7efd18 | 2880 | goto out; |
c5b5ef6c AE |
2881 | } |
2882 | ||
2883 | /* | |
2884 | * Resubmit the original request now that we have recorded | |
2885 | * whether the target object exists. | |
2886 | */ | |
b454e36d | 2887 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2888 | out: |
c5b5ef6c AE |
2889 | if (orig_request->result) |
2890 | rbd_obj_request_complete(orig_request); | |
c5b5ef6c AE |
2891 | } |
2892 | ||
2893 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2894 | { | |
2895 | struct rbd_obj_request *stat_request; | |
2896 | struct rbd_device *rbd_dev; | |
2897 | struct ceph_osd_client *osdc; | |
2898 | struct page **pages = NULL; | |
2899 | u32 page_count; | |
2900 | size_t size; | |
2901 | int ret; | |
2902 | ||
2903 | /* | |
2904 | * The response data for a STAT call consists of: | |
2905 | * le64 length; | |
2906 | * struct { | |
2907 | * le32 tv_sec; | |
2908 | * le32 tv_nsec; | |
2909 | * } mtime; | |
2910 | */ | |
2911 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2912 | page_count = (u32)calc_pages_for(0, size); | |
2913 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2914 | if (IS_ERR(pages)) | |
2915 | return PTR_ERR(pages); | |
2916 | ||
2917 | ret = -ENOMEM; | |
2918 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2919 | OBJ_REQUEST_PAGES); | |
2920 | if (!stat_request) | |
2921 | goto out; | |
2922 | ||
2923 | rbd_obj_request_get(obj_request); | |
2924 | stat_request->obj_request = obj_request; | |
2925 | stat_request->pages = pages; | |
2926 | stat_request->page_count = page_count; | |
2927 | ||
2928 | rbd_assert(obj_request->img_request); | |
2929 | rbd_dev = obj_request->img_request->rbd_dev; | |
6d2940c8 | 2930 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 2931 | stat_request); |
c5b5ef6c AE |
2932 | if (!stat_request->osd_req) |
2933 | goto out; | |
2934 | stat_request->callback = rbd_img_obj_exists_callback; | |
2935 | ||
144cba14 | 2936 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); |
c5b5ef6c AE |
2937 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, |
2938 | false, false); | |
9d4df01f | 2939 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2940 | |
2941 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2942 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2943 | out: | |
2944 | if (ret) | |
2945 | rbd_obj_request_put(obj_request); | |
2946 | ||
2947 | return ret; | |
2948 | } | |
2949 | ||
70d045f6 | 2950 | static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
b454e36d AE |
2951 | { |
2952 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2953 | struct rbd_device *rbd_dev; |
b454e36d AE |
2954 | |
2955 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2956 | ||
2957 | img_request = obj_request->img_request; | |
2958 | rbd_assert(img_request); | |
a9e8ba2c | 2959 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2960 | |
70d045f6 | 2961 | /* Reads */ |
1c220881 JD |
2962 | if (!img_request_write_test(img_request) && |
2963 | !img_request_discard_test(img_request)) | |
70d045f6 ID |
2964 | return true; |
2965 | ||
2966 | /* Non-layered writes */ | |
2967 | if (!img_request_layered_test(img_request)) | |
2968 | return true; | |
2969 | ||
b454e36d | 2970 | /* |
70d045f6 ID |
2971 | * Layered writes outside of the parent overlap range don't |
2972 | * share any data with the parent. | |
b454e36d | 2973 | */ |
70d045f6 ID |
2974 | if (!obj_request_overlaps_parent(obj_request)) |
2975 | return true; | |
b454e36d | 2976 | |
c622d226 GZ |
2977 | /* |
2978 | * Entire-object layered writes - we will overwrite whatever | |
2979 | * parent data there is anyway. | |
2980 | */ | |
2981 | if (!obj_request->offset && | |
2982 | obj_request->length == rbd_obj_bytes(&rbd_dev->header)) | |
2983 | return true; | |
2984 | ||
70d045f6 ID |
2985 | /* |
2986 | * If the object is known to already exist, its parent data has | |
2987 | * already been copied. | |
2988 | */ | |
2989 | if (obj_request_known_test(obj_request) && | |
2990 | obj_request_exists_test(obj_request)) | |
2991 | return true; | |
2992 | ||
2993 | return false; | |
2994 | } | |
2995 | ||
2996 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) | |
2997 | { | |
2998 | if (img_obj_request_simple(obj_request)) { | |
b454e36d AE |
2999 | struct rbd_device *rbd_dev; |
3000 | struct ceph_osd_client *osdc; | |
3001 | ||
3002 | rbd_dev = obj_request->img_request->rbd_dev; | |
3003 | osdc = &rbd_dev->rbd_client->client->osdc; | |
3004 | ||
3005 | return rbd_obj_request_submit(osdc, obj_request); | |
3006 | } | |
3007 | ||
3008 | /* | |
3d7efd18 AE |
3009 | * It's a layered write. The target object might exist but |
3010 | * we may not know that yet. If we know it doesn't exist, | |
3011 | * start by reading the data for the full target object from | |
3012 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 3013 | */ |
70d045f6 | 3014 | if (obj_request_known_test(obj_request)) |
3d7efd18 AE |
3015 | return rbd_img_obj_parent_read_full(obj_request); |
3016 | ||
3017 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
3018 | |
3019 | return rbd_img_obj_exists_submit(obj_request); | |
3020 | } | |
3021 | ||
bf0d5f50 AE |
3022 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
3023 | { | |
bf0d5f50 | 3024 | struct rbd_obj_request *obj_request; |
46faeed4 | 3025 | struct rbd_obj_request *next_obj_request; |
663ae2cc | 3026 | int ret = 0; |
bf0d5f50 | 3027 | |
37206ee5 | 3028 | dout("%s: img %p\n", __func__, img_request); |
bf0d5f50 | 3029 | |
663ae2cc ID |
3030 | rbd_img_request_get(img_request); |
3031 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { | |
b454e36d | 3032 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 | 3033 | if (ret) |
663ae2cc | 3034 | goto out_put_ireq; |
bf0d5f50 AE |
3035 | } |
3036 | ||
663ae2cc ID |
3037 | out_put_ireq: |
3038 | rbd_img_request_put(img_request); | |
3039 | return ret; | |
bf0d5f50 | 3040 | } |
8b3e1a56 AE |
3041 | |
3042 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
3043 | { | |
3044 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
3045 | struct rbd_device *rbd_dev; |
3046 | u64 obj_end; | |
02c74fba AE |
3047 | u64 img_xferred; |
3048 | int img_result; | |
8b3e1a56 AE |
3049 | |
3050 | rbd_assert(img_request_child_test(img_request)); | |
3051 | ||
02c74fba AE |
3052 | /* First get what we need from the image request and release it */ |
3053 | ||
8b3e1a56 | 3054 | obj_request = img_request->obj_request; |
02c74fba AE |
3055 | img_xferred = img_request->xferred; |
3056 | img_result = img_request->result; | |
3057 | rbd_img_request_put(img_request); | |
3058 | ||
3059 | /* | |
3060 | * If the overlap has become 0 (most likely because the | |
3061 | * image has been flattened) we need to re-submit the | |
3062 | * original request. | |
3063 | */ | |
a9e8ba2c AE |
3064 | rbd_assert(obj_request); |
3065 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
3066 | rbd_dev = obj_request->img_request->rbd_dev; |
3067 | if (!rbd_dev->parent_overlap) { | |
3068 | struct ceph_osd_client *osdc; | |
3069 | ||
3070 | osdc = &rbd_dev->rbd_client->client->osdc; | |
3071 | img_result = rbd_obj_request_submit(osdc, obj_request); | |
3072 | if (!img_result) | |
3073 | return; | |
3074 | } | |
a9e8ba2c | 3075 | |
02c74fba | 3076 | obj_request->result = img_result; |
a9e8ba2c AE |
3077 | if (obj_request->result) |
3078 | goto out; | |
3079 | ||
3080 | /* | |
3081 | * We need to zero anything beyond the parent overlap | |
3082 | * boundary. Since rbd_img_obj_request_read_callback() | |
3083 | * will zero anything beyond the end of a short read, an | |
3084 | * easy way to do this is to pretend the data from the | |
3085 | * parent came up short--ending at the overlap boundary. | |
3086 | */ | |
3087 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
3088 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
3089 | if (obj_end > rbd_dev->parent_overlap) { |
3090 | u64 xferred = 0; | |
3091 | ||
3092 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
3093 | xferred = rbd_dev->parent_overlap - | |
3094 | obj_request->img_offset; | |
8b3e1a56 | 3095 | |
02c74fba | 3096 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 3097 | } else { |
02c74fba | 3098 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
3099 | } |
3100 | out: | |
8b3e1a56 AE |
3101 | rbd_img_obj_request_read_callback(obj_request); |
3102 | rbd_obj_request_complete(obj_request); | |
3103 | } | |
3104 | ||
3105 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
3106 | { | |
8b3e1a56 AE |
3107 | struct rbd_img_request *img_request; |
3108 | int result; | |
3109 | ||
3110 | rbd_assert(obj_request_img_data_test(obj_request)); | |
3111 | rbd_assert(obj_request->img_request != NULL); | |
3112 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 3113 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 3114 | |
8b3e1a56 | 3115 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 3116 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 3117 | obj_request->img_offset, |
e93f3152 | 3118 | obj_request->length); |
8b3e1a56 AE |
3119 | result = -ENOMEM; |
3120 | if (!img_request) | |
3121 | goto out_err; | |
3122 | ||
5b2ab72d AE |
3123 | if (obj_request->type == OBJ_REQUEST_BIO) |
3124 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
3125 | obj_request->bio_list); | |
3126 | else | |
3127 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
3128 | obj_request->pages); | |
8b3e1a56 AE |
3129 | if (result) |
3130 | goto out_err; | |
3131 | ||
3132 | img_request->callback = rbd_img_parent_read_callback; | |
3133 | result = rbd_img_request_submit(img_request); | |
3134 | if (result) | |
3135 | goto out_err; | |
3136 | ||
3137 | return; | |
3138 | out_err: | |
3139 | if (img_request) | |
3140 | rbd_img_request_put(img_request); | |
3141 | obj_request->result = result; | |
3142 | obj_request->xferred = 0; | |
3143 | obj_request_done_set(obj_request); | |
3144 | } | |
bf0d5f50 | 3145 | |
ed95b21a ID |
3146 | static const struct rbd_client_id rbd_empty_cid; |
3147 | ||
3148 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, | |
3149 | const struct rbd_client_id *rhs) | |
3150 | { | |
3151 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
3152 | } | |
3153 | ||
3154 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
3155 | { | |
3156 | struct rbd_client_id cid; | |
3157 | ||
3158 | mutex_lock(&rbd_dev->watch_mutex); | |
3159 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
3160 | cid.handle = rbd_dev->watch_cookie; | |
3161 | mutex_unlock(&rbd_dev->watch_mutex); | |
3162 | return cid; | |
3163 | } | |
3164 | ||
3165 | /* | |
3166 | * lock_rwsem must be held for write | |
3167 | */ | |
3168 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
3169 | const struct rbd_client_id *cid) | |
3170 | { | |
3171 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
3172 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
3173 | cid->gid, cid->handle); | |
3174 | rbd_dev->owner_cid = *cid; /* struct */ | |
3175 | } | |
3176 | ||
3177 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
3178 | { | |
3179 | mutex_lock(&rbd_dev->watch_mutex); | |
3180 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
3181 | mutex_unlock(&rbd_dev->watch_mutex); | |
3182 | } | |
3183 | ||
3184 | /* | |
3185 | * lock_rwsem must be held for write | |
3186 | */ | |
3187 | static int rbd_lock(struct rbd_device *rbd_dev) | |
3188 | { | |
3189 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3190 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
3191 | char cookie[32]; | |
3192 | int ret; | |
3193 | ||
3194 | WARN_ON(__rbd_is_lock_owner(rbd_dev)); | |
3195 | ||
3196 | format_lock_cookie(rbd_dev, cookie); | |
3197 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
3198 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
3199 | RBD_LOCK_TAG, "", 0); | |
3200 | if (ret) | |
3201 | return ret; | |
3202 | ||
3203 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; | |
3204 | rbd_set_owner_cid(rbd_dev, &cid); | |
3205 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
3206 | return 0; | |
3207 | } | |
3208 | ||
3209 | /* | |
3210 | * lock_rwsem must be held for write | |
3211 | */ | |
3212 | static int rbd_unlock(struct rbd_device *rbd_dev) | |
b8d70035 | 3213 | { |
922dab61 | 3214 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 3215 | char cookie[32]; |
e627db08 | 3216 | int ret; |
b8d70035 | 3217 | |
ed95b21a ID |
3218 | WARN_ON(!__rbd_is_lock_owner(rbd_dev)); |
3219 | ||
3220 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
3221 | ||
3222 | format_lock_cookie(rbd_dev, cookie); | |
3223 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
3224 | RBD_LOCK_NAME, cookie); | |
3225 | if (ret && ret != -ENOENT) { | |
3226 | rbd_warn(rbd_dev, "cls_unlock failed: %d", ret); | |
3227 | return ret; | |
3228 | } | |
3229 | ||
3230 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3231 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
3232 | return 0; | |
3233 | } | |
3234 | ||
3235 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, | |
3236 | enum rbd_notify_op notify_op, | |
3237 | struct page ***preply_pages, | |
3238 | size_t *preply_len) | |
3239 | { | |
3240 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3241 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
3242 | int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN; | |
3243 | char buf[buf_size]; | |
3244 | void *p = buf; | |
3245 | ||
3246 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); | |
3247 | ||
3248 | /* encode *LockPayload NotifyMessage (op + ClientId) */ | |
3249 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3250 | ceph_encode_32(&p, notify_op); | |
3251 | ceph_encode_64(&p, cid.gid); | |
3252 | ceph_encode_64(&p, cid.handle); | |
3253 | ||
3254 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, | |
3255 | &rbd_dev->header_oloc, buf, buf_size, | |
3256 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
3257 | } | |
3258 | ||
3259 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, | |
3260 | enum rbd_notify_op notify_op) | |
3261 | { | |
3262 | struct page **reply_pages; | |
3263 | size_t reply_len; | |
3264 | ||
3265 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); | |
3266 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
3267 | } | |
3268 | ||
3269 | static void rbd_notify_acquired_lock(struct work_struct *work) | |
3270 | { | |
3271 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3272 | acquired_lock_work); | |
3273 | ||
3274 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); | |
3275 | } | |
3276 | ||
3277 | static void rbd_notify_released_lock(struct work_struct *work) | |
3278 | { | |
3279 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3280 | released_lock_work); | |
3281 | ||
3282 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); | |
3283 | } | |
3284 | ||
3285 | static int rbd_request_lock(struct rbd_device *rbd_dev) | |
3286 | { | |
3287 | struct page **reply_pages; | |
3288 | size_t reply_len; | |
3289 | bool lock_owner_responded = false; | |
3290 | int ret; | |
52bb1f9b | 3291 | |
ed95b21a ID |
3292 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3293 | ||
3294 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, | |
3295 | &reply_pages, &reply_len); | |
3296 | if (ret && ret != -ETIMEDOUT) { | |
3297 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
3298 | goto out; | |
3299 | } | |
3300 | ||
3301 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { | |
3302 | void *p = page_address(reply_pages[0]); | |
3303 | void *const end = p + reply_len; | |
3304 | u32 n; | |
3305 | ||
3306 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ | |
3307 | while (n--) { | |
3308 | u8 struct_v; | |
3309 | u32 len; | |
3310 | ||
3311 | ceph_decode_need(&p, end, 8 + 8, e_inval); | |
3312 | p += 8 + 8; /* skip gid and cookie */ | |
3313 | ||
3314 | ceph_decode_32_safe(&p, end, len, e_inval); | |
3315 | if (!len) | |
3316 | continue; | |
3317 | ||
3318 | if (lock_owner_responded) { | |
3319 | rbd_warn(rbd_dev, | |
3320 | "duplicate lock owners detected"); | |
3321 | ret = -EIO; | |
3322 | goto out; | |
3323 | } | |
3324 | ||
3325 | lock_owner_responded = true; | |
3326 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
3327 | &struct_v, &len); | |
3328 | if (ret) { | |
3329 | rbd_warn(rbd_dev, | |
3330 | "failed to decode ResponseMessage: %d", | |
3331 | ret); | |
3332 | goto e_inval; | |
3333 | } | |
3334 | ||
3335 | ret = ceph_decode_32(&p); | |
3336 | } | |
3337 | } | |
3338 | ||
3339 | if (!lock_owner_responded) { | |
3340 | rbd_warn(rbd_dev, "no lock owners detected"); | |
3341 | ret = -ETIMEDOUT; | |
3342 | } | |
3343 | ||
3344 | out: | |
3345 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
3346 | return ret; | |
3347 | ||
3348 | e_inval: | |
3349 | ret = -EINVAL; | |
3350 | goto out; | |
3351 | } | |
3352 | ||
3353 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
3354 | { | |
3355 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
3356 | ||
3357 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
3358 | if (wake_all) | |
3359 | wake_up_all(&rbd_dev->lock_waitq); | |
3360 | else | |
3361 | wake_up(&rbd_dev->lock_waitq); | |
3362 | } | |
3363 | ||
3364 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
3365 | struct ceph_locker **lockers, u32 *num_lockers) | |
3366 | { | |
3367 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3368 | u8 lock_type; | |
3369 | char *lock_tag; | |
3370 | int ret; | |
3371 | ||
3372 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3373 | ||
3374 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
3375 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3376 | &lock_type, &lock_tag, lockers, num_lockers); | |
3377 | if (ret) | |
3378 | return ret; | |
3379 | ||
3380 | if (*num_lockers == 0) { | |
3381 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
3382 | goto out; | |
3383 | } | |
3384 | ||
3385 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
3386 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
3387 | lock_tag); | |
3388 | ret = -EBUSY; | |
3389 | goto out; | |
3390 | } | |
3391 | ||
3392 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
3393 | rbd_warn(rbd_dev, "shared lock type detected"); | |
3394 | ret = -EBUSY; | |
3395 | goto out; | |
3396 | } | |
3397 | ||
3398 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
3399 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
3400 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
3401 | (*lockers)[0].id.cookie); | |
3402 | ret = -EBUSY; | |
3403 | goto out; | |
3404 | } | |
3405 | ||
3406 | out: | |
3407 | kfree(lock_tag); | |
3408 | return ret; | |
3409 | } | |
3410 | ||
3411 | static int find_watcher(struct rbd_device *rbd_dev, | |
3412 | const struct ceph_locker *locker) | |
3413 | { | |
3414 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3415 | struct ceph_watch_item *watchers; | |
3416 | u32 num_watchers; | |
3417 | u64 cookie; | |
3418 | int i; | |
3419 | int ret; | |
3420 | ||
3421 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
3422 | &rbd_dev->header_oloc, &watchers, | |
3423 | &num_watchers); | |
3424 | if (ret) | |
3425 | return ret; | |
3426 | ||
3427 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
3428 | for (i = 0; i < num_watchers; i++) { | |
3429 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
3430 | sizeof(locker->info.addr)) && | |
3431 | watchers[i].cookie == cookie) { | |
3432 | struct rbd_client_id cid = { | |
3433 | .gid = le64_to_cpu(watchers[i].name.num), | |
3434 | .handle = cookie, | |
3435 | }; | |
3436 | ||
3437 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
3438 | rbd_dev, cid.gid, cid.handle); | |
3439 | rbd_set_owner_cid(rbd_dev, &cid); | |
3440 | ret = 1; | |
3441 | goto out; | |
3442 | } | |
3443 | } | |
3444 | ||
3445 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
3446 | ret = 0; | |
3447 | out: | |
3448 | kfree(watchers); | |
3449 | return ret; | |
3450 | } | |
3451 | ||
3452 | /* | |
3453 | * lock_rwsem must be held for write | |
3454 | */ | |
3455 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
3456 | { | |
3457 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3458 | struct ceph_locker *lockers; | |
3459 | u32 num_lockers; | |
3460 | int ret; | |
3461 | ||
3462 | for (;;) { | |
3463 | ret = rbd_lock(rbd_dev); | |
3464 | if (ret != -EBUSY) | |
3465 | return ret; | |
3466 | ||
3467 | /* determine if the current lock holder is still alive */ | |
3468 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
3469 | if (ret) | |
3470 | return ret; | |
3471 | ||
3472 | if (num_lockers == 0) | |
3473 | goto again; | |
3474 | ||
3475 | ret = find_watcher(rbd_dev, lockers); | |
3476 | if (ret) { | |
3477 | if (ret > 0) | |
3478 | ret = 0; /* have to request lock */ | |
3479 | goto out; | |
3480 | } | |
3481 | ||
3482 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
3483 | ENTITY_NAME(lockers[0].id.name)); | |
3484 | ||
3485 | ret = ceph_monc_blacklist_add(&client->monc, | |
3486 | &lockers[0].info.addr); | |
3487 | if (ret) { | |
3488 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
3489 | ENTITY_NAME(lockers[0].id.name), ret); | |
3490 | goto out; | |
3491 | } | |
3492 | ||
3493 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
3494 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3495 | lockers[0].id.cookie, | |
3496 | &lockers[0].id.name); | |
3497 | if (ret && ret != -ENOENT) | |
3498 | goto out; | |
3499 | ||
3500 | again: | |
3501 | ceph_free_lockers(lockers, num_lockers); | |
3502 | } | |
3503 | ||
3504 | out: | |
3505 | ceph_free_lockers(lockers, num_lockers); | |
3506 | return ret; | |
3507 | } | |
3508 | ||
3509 | /* | |
3510 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
3511 | */ | |
3512 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
3513 | int *pret) | |
3514 | { | |
3515 | enum rbd_lock_state lock_state; | |
3516 | ||
3517 | down_read(&rbd_dev->lock_rwsem); | |
3518 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3519 | rbd_dev->lock_state); | |
3520 | if (__rbd_is_lock_owner(rbd_dev)) { | |
3521 | lock_state = rbd_dev->lock_state; | |
3522 | up_read(&rbd_dev->lock_rwsem); | |
3523 | return lock_state; | |
3524 | } | |
3525 | ||
3526 | up_read(&rbd_dev->lock_rwsem); | |
3527 | down_write(&rbd_dev->lock_rwsem); | |
3528 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3529 | rbd_dev->lock_state); | |
3530 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
3531 | *pret = rbd_try_lock(rbd_dev); | |
3532 | if (*pret) | |
3533 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
3534 | } | |
3535 | ||
3536 | lock_state = rbd_dev->lock_state; | |
3537 | up_write(&rbd_dev->lock_rwsem); | |
3538 | return lock_state; | |
3539 | } | |
3540 | ||
3541 | static void rbd_acquire_lock(struct work_struct *work) | |
3542 | { | |
3543 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3544 | struct rbd_device, lock_dwork); | |
3545 | enum rbd_lock_state lock_state; | |
3546 | int ret; | |
3547 | ||
3548 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3549 | again: | |
3550 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
3551 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
3552 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
3553 | wake_requests(rbd_dev, true); | |
3554 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
3555 | rbd_dev, lock_state, ret); | |
3556 | return; | |
3557 | } | |
3558 | ||
3559 | ret = rbd_request_lock(rbd_dev); | |
3560 | if (ret == -ETIMEDOUT) { | |
3561 | goto again; /* treat this as a dead client */ | |
3562 | } else if (ret < 0) { | |
3563 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3564 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3565 | RBD_RETRY_DELAY); | |
3566 | } else { | |
3567 | /* | |
3568 | * lock owner acked, but resend if we don't see them | |
3569 | * release the lock | |
3570 | */ | |
3571 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3572 | rbd_dev); | |
3573 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3574 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3575 | } | |
3576 | } | |
3577 | ||
3578 | /* | |
3579 | * lock_rwsem must be held for write | |
3580 | */ | |
3581 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3582 | { | |
3583 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3584 | rbd_dev->lock_state); | |
3585 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3586 | return false; | |
3587 | ||
3588 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3589 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3590 | /* |
ed95b21a | 3591 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3592 | * |
ed95b21a ID |
3593 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3594 | * may be shared with other devices. | |
52bb1f9b | 3595 | */ |
ed95b21a ID |
3596 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3597 | up_read(&rbd_dev->lock_rwsem); | |
3598 | ||
3599 | down_write(&rbd_dev->lock_rwsem); | |
3600 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3601 | rbd_dev->lock_state); | |
3602 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3603 | return false; | |
3604 | ||
3605 | if (!rbd_unlock(rbd_dev)) | |
3606 | /* | |
3607 | * Give others a chance to grab the lock - we would re-acquire | |
3608 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3609 | * otherwise. We need to ack our own notifications, so this | |
3610 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3611 | * after wake_requests() in rbd_handle_released_lock(). | |
3612 | */ | |
3613 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
3614 | ||
3615 | return true; | |
3616 | } | |
3617 | ||
3618 | static void rbd_release_lock_work(struct work_struct *work) | |
3619 | { | |
3620 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3621 | unlock_work); | |
3622 | ||
3623 | down_write(&rbd_dev->lock_rwsem); | |
3624 | rbd_release_lock(rbd_dev); | |
3625 | up_write(&rbd_dev->lock_rwsem); | |
3626 | } | |
3627 | ||
3628 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3629 | void **p) | |
3630 | { | |
3631 | struct rbd_client_id cid = { 0 }; | |
3632 | ||
3633 | if (struct_v >= 2) { | |
3634 | cid.gid = ceph_decode_64(p); | |
3635 | cid.handle = ceph_decode_64(p); | |
3636 | } | |
3637 | ||
3638 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3639 | cid.handle); | |
3640 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3641 | down_write(&rbd_dev->lock_rwsem); | |
3642 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3643 | /* | |
3644 | * we already know that the remote client is | |
3645 | * the owner | |
3646 | */ | |
3647 | up_write(&rbd_dev->lock_rwsem); | |
3648 | return; | |
3649 | } | |
3650 | ||
3651 | rbd_set_owner_cid(rbd_dev, &cid); | |
3652 | downgrade_write(&rbd_dev->lock_rwsem); | |
3653 | } else { | |
3654 | down_read(&rbd_dev->lock_rwsem); | |
3655 | } | |
3656 | ||
3657 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3658 | wake_requests(rbd_dev, false); | |
3659 | up_read(&rbd_dev->lock_rwsem); | |
3660 | } | |
3661 | ||
3662 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3663 | void **p) | |
3664 | { | |
3665 | struct rbd_client_id cid = { 0 }; | |
3666 | ||
3667 | if (struct_v >= 2) { | |
3668 | cid.gid = ceph_decode_64(p); | |
3669 | cid.handle = ceph_decode_64(p); | |
3670 | } | |
3671 | ||
3672 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3673 | cid.handle); | |
3674 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3675 | down_write(&rbd_dev->lock_rwsem); | |
3676 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3677 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3678 | __func__, rbd_dev, cid.gid, cid.handle, | |
3679 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3680 | up_write(&rbd_dev->lock_rwsem); | |
3681 | return; | |
3682 | } | |
3683 | ||
3684 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3685 | downgrade_write(&rbd_dev->lock_rwsem); | |
3686 | } else { | |
3687 | down_read(&rbd_dev->lock_rwsem); | |
3688 | } | |
3689 | ||
3690 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3691 | wake_requests(rbd_dev, false); | |
3692 | up_read(&rbd_dev->lock_rwsem); | |
3693 | } | |
3694 | ||
3695 | static bool rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3696 | void **p) | |
3697 | { | |
3698 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3699 | struct rbd_client_id cid = { 0 }; | |
3700 | bool need_to_send; | |
3701 | ||
3702 | if (struct_v >= 2) { | |
3703 | cid.gid = ceph_decode_64(p); | |
3704 | cid.handle = ceph_decode_64(p); | |
3705 | } | |
3706 | ||
3707 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3708 | cid.handle); | |
3709 | if (rbd_cid_equal(&cid, &my_cid)) | |
3710 | return false; | |
3711 | ||
3712 | down_read(&rbd_dev->lock_rwsem); | |
3713 | need_to_send = __rbd_is_lock_owner(rbd_dev); | |
3714 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
3715 | if (!rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) { | |
3716 | dout("%s rbd_dev %p queueing unlock_work\n", __func__, | |
3717 | rbd_dev); | |
3718 | queue_work(rbd_dev->task_wq, &rbd_dev->unlock_work); | |
3719 | } | |
3720 | } | |
3721 | up_read(&rbd_dev->lock_rwsem); | |
3722 | return need_to_send; | |
3723 | } | |
3724 | ||
3725 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3726 | u64 notify_id, u64 cookie, s32 *result) | |
3727 | { | |
3728 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3729 | int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; | |
3730 | char buf[buf_size]; | |
3731 | int ret; | |
3732 | ||
3733 | if (result) { | |
3734 | void *p = buf; | |
3735 | ||
3736 | /* encode ResponseMessage */ | |
3737 | ceph_start_encoding(&p, 1, 1, | |
3738 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3739 | ceph_encode_32(&p, *result); | |
3740 | } else { | |
3741 | buf_size = 0; | |
3742 | } | |
b8d70035 | 3743 | |
922dab61 ID |
3744 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3745 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3746 | buf, buf_size); |
52bb1f9b | 3747 | if (ret) |
ed95b21a ID |
3748 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3749 | } | |
3750 | ||
3751 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3752 | u64 cookie) | |
3753 | { | |
3754 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3755 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3756 | } | |
3757 | ||
3758 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3759 | u64 notify_id, u64 cookie, s32 result) | |
3760 | { | |
3761 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3762 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3763 | } | |
3764 | ||
3765 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3766 | u64 notifier_id, void *data, size_t data_len) | |
3767 | { | |
3768 | struct rbd_device *rbd_dev = arg; | |
3769 | void *p = data; | |
3770 | void *const end = p + data_len; | |
3771 | u8 struct_v; | |
3772 | u32 len; | |
3773 | u32 notify_op; | |
3774 | int ret; | |
3775 | ||
3776 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3777 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3778 | if (data_len) { | |
3779 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3780 | &struct_v, &len); | |
3781 | if (ret) { | |
3782 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3783 | ret); | |
3784 | return; | |
3785 | } | |
3786 | ||
3787 | notify_op = ceph_decode_32(&p); | |
3788 | } else { | |
3789 | /* legacy notification for header updates */ | |
3790 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3791 | len = 0; | |
3792 | } | |
3793 | ||
3794 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3795 | switch (notify_op) { | |
3796 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3797 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3798 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3799 | break; | |
3800 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3801 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3802 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3803 | break; | |
3804 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3805 | if (rbd_handle_request_lock(rbd_dev, struct_v, &p)) | |
3806 | /* | |
3807 | * send ResponseMessage(0) back so the client | |
3808 | * can detect a missing owner | |
3809 | */ | |
3810 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3811 | cookie, 0); | |
3812 | else | |
3813 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3814 | break; | |
3815 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3816 | ret = rbd_dev_refresh(rbd_dev); | |
3817 | if (ret) | |
3818 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3819 | ||
3820 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3821 | break; | |
3822 | default: | |
3823 | if (rbd_is_lock_owner(rbd_dev)) | |
3824 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3825 | cookie, -EOPNOTSUPP); | |
3826 | else | |
3827 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3828 | break; | |
3829 | } | |
b8d70035 AE |
3830 | } |
3831 | ||
99d16943 ID |
3832 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3833 | ||
922dab61 | 3834 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3835 | { |
922dab61 | 3836 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3837 | |
922dab61 | 3838 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3839 | |
ed95b21a ID |
3840 | down_write(&rbd_dev->lock_rwsem); |
3841 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3842 | up_write(&rbd_dev->lock_rwsem); | |
3843 | ||
99d16943 ID |
3844 | mutex_lock(&rbd_dev->watch_mutex); |
3845 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3846 | __rbd_unregister_watch(rbd_dev); | |
3847 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3848 | |
99d16943 | 3849 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3850 | } |
99d16943 | 3851 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3852 | } |
3853 | ||
9969ebc5 | 3854 | /* |
99d16943 | 3855 | * watch_mutex must be locked |
9969ebc5 | 3856 | */ |
99d16943 | 3857 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3858 | { |
3859 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3860 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3861 | |
922dab61 | 3862 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3863 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3864 | |
922dab61 ID |
3865 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3866 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3867 | rbd_watch_errcb, rbd_dev); | |
3868 | if (IS_ERR(handle)) | |
3869 | return PTR_ERR(handle); | |
8eb87565 | 3870 | |
922dab61 | 3871 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3872 | return 0; |
b30a01f2 ID |
3873 | } |
3874 | ||
99d16943 ID |
3875 | /* |
3876 | * watch_mutex must be locked | |
3877 | */ | |
3878 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3879 | { |
922dab61 ID |
3880 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3881 | int ret; | |
b30a01f2 | 3882 | |
99d16943 ID |
3883 | rbd_assert(rbd_dev->watch_handle); |
3884 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3885 | |
922dab61 ID |
3886 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3887 | if (ret) | |
3888 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3889 | |
922dab61 | 3890 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3891 | } |
3892 | ||
99d16943 ID |
3893 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3894 | { | |
3895 | int ret; | |
3896 | ||
3897 | mutex_lock(&rbd_dev->watch_mutex); | |
3898 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3899 | ret = __rbd_register_watch(rbd_dev); | |
3900 | if (ret) | |
3901 | goto out; | |
3902 | ||
3903 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3904 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3905 | ||
3906 | out: | |
3907 | mutex_unlock(&rbd_dev->watch_mutex); | |
3908 | return ret; | |
3909 | } | |
3910 | ||
3911 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3912 | { |
99d16943 ID |
3913 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3914 | ||
3915 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
ed95b21a ID |
3916 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3917 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3918 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3919 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3920 | } |
3921 | ||
3922 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3923 | { | |
ed95b21a | 3924 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3925 | cancel_tasks_sync(rbd_dev); |
3926 | ||
3927 | mutex_lock(&rbd_dev->watch_mutex); | |
3928 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3929 | __rbd_unregister_watch(rbd_dev); | |
3930 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3931 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3932 | |
811c6688 | 3933 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3934 | } |
3935 | ||
99d16943 ID |
3936 | static void rbd_reregister_watch(struct work_struct *work) |
3937 | { | |
3938 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3939 | struct rbd_device, watch_dwork); | |
ed95b21a | 3940 | bool was_lock_owner = false; |
99d16943 ID |
3941 | int ret; |
3942 | ||
3943 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3944 | ||
ed95b21a ID |
3945 | down_write(&rbd_dev->lock_rwsem); |
3946 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3947 | was_lock_owner = rbd_release_lock(rbd_dev); | |
3948 | ||
99d16943 ID |
3949 | mutex_lock(&rbd_dev->watch_mutex); |
3950 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) | |
3951 | goto fail_unlock; | |
3952 | ||
3953 | ret = __rbd_register_watch(rbd_dev); | |
3954 | if (ret) { | |
3955 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
3956 | if (ret != -EBLACKLISTED) | |
3957 | queue_delayed_work(rbd_dev->task_wq, | |
3958 | &rbd_dev->watch_dwork, | |
3959 | RBD_RETRY_DELAY); | |
3960 | goto fail_unlock; | |
3961 | } | |
3962 | ||
3963 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3964 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3965 | mutex_unlock(&rbd_dev->watch_mutex); | |
3966 | ||
3967 | ret = rbd_dev_refresh(rbd_dev); | |
3968 | if (ret) | |
3969 | rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); | |
3970 | ||
ed95b21a ID |
3971 | if (was_lock_owner) { |
3972 | ret = rbd_try_lock(rbd_dev); | |
3973 | if (ret) | |
3974 | rbd_warn(rbd_dev, "reregisteration lock failed: %d", | |
3975 | ret); | |
3976 | } | |
3977 | ||
3978 | up_write(&rbd_dev->lock_rwsem); | |
3979 | wake_requests(rbd_dev, true); | |
99d16943 ID |
3980 | return; |
3981 | ||
3982 | fail_unlock: | |
3983 | mutex_unlock(&rbd_dev->watch_mutex); | |
ed95b21a | 3984 | up_write(&rbd_dev->lock_rwsem); |
99d16943 ID |
3985 | } |
3986 | ||
36be9a76 | 3987 | /* |
f40eb349 AE |
3988 | * Synchronous osd object method call. Returns the number of bytes |
3989 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3990 | */ |
3991 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
3992 | const char *object_name, | |
3993 | const char *class_name, | |
3994 | const char *method_name, | |
4157976b | 3995 | const void *outbound, |
36be9a76 | 3996 | size_t outbound_size, |
4157976b | 3997 | void *inbound, |
e2a58ee5 | 3998 | size_t inbound_size) |
36be9a76 | 3999 | { |
2169238d | 4000 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 4001 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
4002 | struct page **pages; |
4003 | u32 page_count; | |
4004 | int ret; | |
4005 | ||
4006 | /* | |
6010a451 AE |
4007 | * Method calls are ultimately read operations. The result |
4008 | * should placed into the inbound buffer provided. They | |
4009 | * also supply outbound data--parameters for the object | |
4010 | * method. Currently if this is present it will be a | |
4011 | * snapshot id. | |
36be9a76 | 4012 | */ |
57385b51 | 4013 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
4014 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
4015 | if (IS_ERR(pages)) | |
4016 | return PTR_ERR(pages); | |
4017 | ||
4018 | ret = -ENOMEM; | |
6010a451 | 4019 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
4020 | OBJ_REQUEST_PAGES); |
4021 | if (!obj_request) | |
4022 | goto out; | |
4023 | ||
4024 | obj_request->pages = pages; | |
4025 | obj_request->page_count = page_count; | |
4026 | ||
6d2940c8 | 4027 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 4028 | obj_request); |
36be9a76 AE |
4029 | if (!obj_request->osd_req) |
4030 | goto out; | |
4031 | ||
c99d2d4a | 4032 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
4033 | class_name, method_name); |
4034 | if (outbound_size) { | |
4035 | struct ceph_pagelist *pagelist; | |
4036 | ||
4037 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
4038 | if (!pagelist) | |
4039 | goto out; | |
4040 | ||
4041 | ceph_pagelist_init(pagelist); | |
4042 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
4043 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
4044 | pagelist); | |
4045 | } | |
a4ce40a9 AE |
4046 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
4047 | obj_request->pages, inbound_size, | |
44cd188d | 4048 | 0, false, false); |
9d4df01f | 4049 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 4050 | |
36be9a76 AE |
4051 | ret = rbd_obj_request_submit(osdc, obj_request); |
4052 | if (ret) | |
4053 | goto out; | |
4054 | ret = rbd_obj_request_wait(obj_request); | |
4055 | if (ret) | |
4056 | goto out; | |
4057 | ||
4058 | ret = obj_request->result; | |
4059 | if (ret < 0) | |
4060 | goto out; | |
57385b51 AE |
4061 | |
4062 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
4063 | ret = (int)obj_request->xferred; | |
903bb32e | 4064 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
4065 | out: |
4066 | if (obj_request) | |
4067 | rbd_obj_request_put(obj_request); | |
4068 | else | |
4069 | ceph_release_page_vector(pages, page_count); | |
4070 | ||
4071 | return ret; | |
4072 | } | |
4073 | ||
ed95b21a ID |
4074 | /* |
4075 | * lock_rwsem must be held for read | |
4076 | */ | |
4077 | static void rbd_wait_state_locked(struct rbd_device *rbd_dev) | |
4078 | { | |
4079 | DEFINE_WAIT(wait); | |
4080 | ||
4081 | do { | |
4082 | /* | |
4083 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
4084 | * and cancel_delayed_work() in wake_requests(). | |
4085 | */ | |
4086 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
4087 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
4088 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
4089 | TASK_UNINTERRUPTIBLE); | |
4090 | up_read(&rbd_dev->lock_rwsem); | |
4091 | schedule(); | |
4092 | down_read(&rbd_dev->lock_rwsem); | |
4093 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
4094 | finish_wait(&rbd_dev->lock_waitq, &wait); | |
4095 | } | |
4096 | ||
7ad18afa | 4097 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 4098 | { |
7ad18afa CH |
4099 | struct request *rq = blk_mq_rq_from_pdu(work); |
4100 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 4101 | struct rbd_img_request *img_request; |
4e752f0a | 4102 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
4103 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
4104 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 4105 | enum obj_operation_type op_type; |
4e752f0a | 4106 | u64 mapping_size; |
ed95b21a | 4107 | bool must_be_locked = false; |
bf0d5f50 AE |
4108 | int result; |
4109 | ||
7ad18afa CH |
4110 | if (rq->cmd_type != REQ_TYPE_FS) { |
4111 | dout("%s: non-fs request type %d\n", __func__, | |
4112 | (int) rq->cmd_type); | |
4113 | result = -EIO; | |
4114 | goto err; | |
4115 | } | |
4116 | ||
c2df40df | 4117 | if (req_op(rq) == REQ_OP_DISCARD) |
90e98c52 | 4118 | op_type = OBJ_OP_DISCARD; |
c2df40df | 4119 | else if (req_op(rq) == REQ_OP_WRITE) |
6d2940c8 GZ |
4120 | op_type = OBJ_OP_WRITE; |
4121 | else | |
4122 | op_type = OBJ_OP_READ; | |
4123 | ||
bc1ecc65 | 4124 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 4125 | |
bc1ecc65 ID |
4126 | if (!length) { |
4127 | dout("%s: zero-length request\n", __func__); | |
4128 | result = 0; | |
4129 | goto err_rq; | |
4130 | } | |
bf0d5f50 | 4131 | |
6d2940c8 | 4132 | /* Only reads are allowed to a read-only device */ |
bc1ecc65 | 4133 | |
6d2940c8 | 4134 | if (op_type != OBJ_OP_READ) { |
bc1ecc65 ID |
4135 | if (rbd_dev->mapping.read_only) { |
4136 | result = -EROFS; | |
4137 | goto err_rq; | |
4dda41d3 | 4138 | } |
bc1ecc65 ID |
4139 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
4140 | } | |
4dda41d3 | 4141 | |
bc1ecc65 ID |
4142 | /* |
4143 | * Quit early if the mapped snapshot no longer exists. It's | |
4144 | * still possible the snapshot will have disappeared by the | |
4145 | * time our request arrives at the osd, but there's no sense in | |
4146 | * sending it if we already know. | |
4147 | */ | |
4148 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
4149 | dout("request for non-existent snapshot"); | |
4150 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
4151 | result = -ENXIO; | |
4152 | goto err_rq; | |
4153 | } | |
4dda41d3 | 4154 | |
bc1ecc65 ID |
4155 | if (offset && length > U64_MAX - offset + 1) { |
4156 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
4157 | length); | |
4158 | result = -EINVAL; | |
4159 | goto err_rq; /* Shouldn't happen */ | |
4160 | } | |
4dda41d3 | 4161 | |
7ad18afa CH |
4162 | blk_mq_start_request(rq); |
4163 | ||
4e752f0a JD |
4164 | down_read(&rbd_dev->header_rwsem); |
4165 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 4166 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
4167 | snapc = rbd_dev->header.snapc; |
4168 | ceph_get_snap_context(snapc); | |
ed95b21a | 4169 | must_be_locked = rbd_is_lock_supported(rbd_dev); |
4e752f0a JD |
4170 | } |
4171 | up_read(&rbd_dev->header_rwsem); | |
4172 | ||
4173 | if (offset + length > mapping_size) { | |
bc1ecc65 | 4174 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 4175 | length, mapping_size); |
bc1ecc65 ID |
4176 | result = -EIO; |
4177 | goto err_rq; | |
4178 | } | |
bf0d5f50 | 4179 | |
ed95b21a ID |
4180 | if (must_be_locked) { |
4181 | down_read(&rbd_dev->lock_rwsem); | |
4182 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
4183 | rbd_wait_state_locked(rbd_dev); | |
4184 | } | |
4185 | ||
6d2940c8 | 4186 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
4e752f0a | 4187 | snapc); |
bc1ecc65 ID |
4188 | if (!img_request) { |
4189 | result = -ENOMEM; | |
ed95b21a | 4190 | goto err_unlock; |
bc1ecc65 ID |
4191 | } |
4192 | img_request->rq = rq; | |
70b16db8 | 4193 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 4194 | |
90e98c52 GZ |
4195 | if (op_type == OBJ_OP_DISCARD) |
4196 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, | |
4197 | NULL); | |
4198 | else | |
4199 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
4200 | rq->bio); | |
bc1ecc65 ID |
4201 | if (result) |
4202 | goto err_img_request; | |
bf0d5f50 | 4203 | |
bc1ecc65 ID |
4204 | result = rbd_img_request_submit(img_request); |
4205 | if (result) | |
4206 | goto err_img_request; | |
bf0d5f50 | 4207 | |
ed95b21a ID |
4208 | if (must_be_locked) |
4209 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 4210 | return; |
bf0d5f50 | 4211 | |
bc1ecc65 ID |
4212 | err_img_request: |
4213 | rbd_img_request_put(img_request); | |
ed95b21a ID |
4214 | err_unlock: |
4215 | if (must_be_locked) | |
4216 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
4217 | err_rq: |
4218 | if (result) | |
4219 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 4220 | obj_op_name(op_type), length, offset, result); |
e96a650a | 4221 | ceph_put_snap_context(snapc); |
7ad18afa CH |
4222 | err: |
4223 | blk_mq_end_request(rq, result); | |
bc1ecc65 | 4224 | } |
bf0d5f50 | 4225 | |
7ad18afa CH |
4226 | static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
4227 | const struct blk_mq_queue_data *bd) | |
bc1ecc65 | 4228 | { |
7ad18afa CH |
4229 | struct request *rq = bd->rq; |
4230 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 4231 | |
7ad18afa CH |
4232 | queue_work(rbd_wq, work); |
4233 | return BLK_MQ_RQ_QUEUE_OK; | |
bf0d5f50 AE |
4234 | } |
4235 | ||
602adf40 YS |
4236 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
4237 | { | |
4238 | struct gendisk *disk = rbd_dev->disk; | |
4239 | ||
4240 | if (!disk) | |
4241 | return; | |
4242 | ||
a0cab924 AE |
4243 | rbd_dev->disk = NULL; |
4244 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 4245 | del_gendisk(disk); |
a0cab924 AE |
4246 | if (disk->queue) |
4247 | blk_cleanup_queue(disk->queue); | |
7ad18afa | 4248 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
a0cab924 | 4249 | } |
602adf40 YS |
4250 | put_disk(disk); |
4251 | } | |
4252 | ||
788e2df3 AE |
4253 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
4254 | const char *object_name, | |
7097f8df | 4255 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
4256 | |
4257 | { | |
2169238d | 4258 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 4259 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
4260 | struct page **pages = NULL; |
4261 | u32 page_count; | |
1ceae7ef | 4262 | size_t size; |
788e2df3 AE |
4263 | int ret; |
4264 | ||
4265 | page_count = (u32) calc_pages_for(offset, length); | |
4266 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
4267 | if (IS_ERR(pages)) | |
a8d42056 | 4268 | return PTR_ERR(pages); |
788e2df3 AE |
4269 | |
4270 | ret = -ENOMEM; | |
4271 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 4272 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
4273 | if (!obj_request) |
4274 | goto out; | |
4275 | ||
4276 | obj_request->pages = pages; | |
4277 | obj_request->page_count = page_count; | |
4278 | ||
6d2940c8 | 4279 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 4280 | obj_request); |
788e2df3 AE |
4281 | if (!obj_request->osd_req) |
4282 | goto out; | |
4283 | ||
c99d2d4a AE |
4284 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
4285 | offset, length, 0, 0); | |
406e2c9f | 4286 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 4287 | obj_request->pages, |
44cd188d AE |
4288 | obj_request->length, |
4289 | obj_request->offset & ~PAGE_MASK, | |
4290 | false, false); | |
9d4df01f | 4291 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 4292 | |
788e2df3 AE |
4293 | ret = rbd_obj_request_submit(osdc, obj_request); |
4294 | if (ret) | |
4295 | goto out; | |
4296 | ret = rbd_obj_request_wait(obj_request); | |
4297 | if (ret) | |
4298 | goto out; | |
4299 | ||
4300 | ret = obj_request->result; | |
4301 | if (ret < 0) | |
4302 | goto out; | |
1ceae7ef AE |
4303 | |
4304 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
4305 | size = (size_t) obj_request->xferred; | |
903bb32e | 4306 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
4307 | rbd_assert(size <= (size_t)INT_MAX); |
4308 | ret = (int)size; | |
788e2df3 AE |
4309 | out: |
4310 | if (obj_request) | |
4311 | rbd_obj_request_put(obj_request); | |
4312 | else | |
4313 | ceph_release_page_vector(pages, page_count); | |
4314 | ||
4315 | return ret; | |
4316 | } | |
4317 | ||
602adf40 | 4318 | /* |
662518b1 AE |
4319 | * Read the complete header for the given rbd device. On successful |
4320 | * return, the rbd_dev->header field will contain up-to-date | |
4321 | * information about the image. | |
602adf40 | 4322 | */ |
99a41ebc | 4323 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 4324 | { |
4156d998 | 4325 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 4326 | u32 snap_count = 0; |
4156d998 AE |
4327 | u64 names_size = 0; |
4328 | u32 want_count; | |
4329 | int ret; | |
602adf40 | 4330 | |
00f1f36f | 4331 | /* |
4156d998 AE |
4332 | * The complete header will include an array of its 64-bit |
4333 | * snapshot ids, followed by the names of those snapshots as | |
4334 | * a contiguous block of NUL-terminated strings. Note that | |
4335 | * the number of snapshots could change by the time we read | |
4336 | * it in, in which case we re-read it. | |
00f1f36f | 4337 | */ |
4156d998 AE |
4338 | do { |
4339 | size_t size; | |
4340 | ||
4341 | kfree(ondisk); | |
4342 | ||
4343 | size = sizeof (*ondisk); | |
4344 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
4345 | size += names_size; | |
4346 | ondisk = kmalloc(size, GFP_KERNEL); | |
4347 | if (!ondisk) | |
662518b1 | 4348 | return -ENOMEM; |
4156d998 | 4349 | |
c41d13a3 | 4350 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_oid.name, |
7097f8df | 4351 | 0, size, ondisk); |
4156d998 | 4352 | if (ret < 0) |
662518b1 | 4353 | goto out; |
c0cd10db | 4354 | if ((size_t)ret < size) { |
4156d998 | 4355 | ret = -ENXIO; |
06ecc6cb AE |
4356 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
4357 | size, ret); | |
662518b1 | 4358 | goto out; |
4156d998 AE |
4359 | } |
4360 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
4361 | ret = -ENXIO; | |
06ecc6cb | 4362 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 4363 | goto out; |
81e759fb | 4364 | } |
602adf40 | 4365 | |
4156d998 AE |
4366 | names_size = le64_to_cpu(ondisk->snap_names_len); |
4367 | want_count = snap_count; | |
4368 | snap_count = le32_to_cpu(ondisk->snap_count); | |
4369 | } while (snap_count != want_count); | |
00f1f36f | 4370 | |
662518b1 AE |
4371 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
4372 | out: | |
4156d998 AE |
4373 | kfree(ondisk); |
4374 | ||
4375 | return ret; | |
602adf40 YS |
4376 | } |
4377 | ||
15228ede AE |
4378 | /* |
4379 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
4380 | * has disappeared from the (just updated) snapshot context. | |
4381 | */ | |
4382 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
4383 | { | |
4384 | u64 snap_id; | |
4385 | ||
4386 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
4387 | return; | |
4388 | ||
4389 | snap_id = rbd_dev->spec->snap_id; | |
4390 | if (snap_id == CEPH_NOSNAP) | |
4391 | return; | |
4392 | ||
4393 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
4394 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
4395 | } | |
4396 | ||
9875201e JD |
4397 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
4398 | { | |
4399 | sector_t size; | |
9875201e JD |
4400 | |
4401 | /* | |
811c6688 ID |
4402 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
4403 | * try to update its size. If REMOVING is set, updating size | |
4404 | * is just useless work since the device can't be opened. | |
9875201e | 4405 | */ |
811c6688 ID |
4406 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
4407 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
4408 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
4409 | dout("setting size to %llu sectors", (unsigned long long)size); | |
4410 | set_capacity(rbd_dev->disk, size); | |
4411 | revalidate_disk(rbd_dev->disk); | |
4412 | } | |
4413 | } | |
4414 | ||
cc4a38bd | 4415 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 4416 | { |
e627db08 | 4417 | u64 mapping_size; |
1fe5e993 AE |
4418 | int ret; |
4419 | ||
cfbf6377 | 4420 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 4421 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
4422 | |
4423 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 4424 | if (ret) |
73e39e4d | 4425 | goto out; |
15228ede | 4426 | |
e8f59b59 ID |
4427 | /* |
4428 | * If there is a parent, see if it has disappeared due to the | |
4429 | * mapped image getting flattened. | |
4430 | */ | |
4431 | if (rbd_dev->parent) { | |
4432 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4433 | if (ret) | |
73e39e4d | 4434 | goto out; |
e8f59b59 ID |
4435 | } |
4436 | ||
5ff1108c | 4437 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 4438 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
4439 | } else { |
4440 | /* validate mapped snapshot's EXISTS flag */ | |
4441 | rbd_exists_validate(rbd_dev); | |
4442 | } | |
15228ede | 4443 | |
73e39e4d | 4444 | out: |
cfbf6377 | 4445 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 4446 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 4447 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 4448 | |
73e39e4d | 4449 | return ret; |
1fe5e993 AE |
4450 | } |
4451 | ||
7ad18afa CH |
4452 | static int rbd_init_request(void *data, struct request *rq, |
4453 | unsigned int hctx_idx, unsigned int request_idx, | |
4454 | unsigned int numa_node) | |
4455 | { | |
4456 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
4457 | ||
4458 | INIT_WORK(work, rbd_queue_workfn); | |
4459 | return 0; | |
4460 | } | |
4461 | ||
4462 | static struct blk_mq_ops rbd_mq_ops = { | |
4463 | .queue_rq = rbd_queue_rq, | |
4464 | .map_queue = blk_mq_map_queue, | |
4465 | .init_request = rbd_init_request, | |
4466 | }; | |
4467 | ||
602adf40 YS |
4468 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
4469 | { | |
4470 | struct gendisk *disk; | |
4471 | struct request_queue *q; | |
593a9e7b | 4472 | u64 segment_size; |
7ad18afa | 4473 | int err; |
602adf40 | 4474 | |
602adf40 | 4475 | /* create gendisk info */ |
7e513d43 ID |
4476 | disk = alloc_disk(single_major ? |
4477 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
4478 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 4479 | if (!disk) |
1fcdb8aa | 4480 | return -ENOMEM; |
602adf40 | 4481 | |
f0f8cef5 | 4482 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 4483 | rbd_dev->dev_id); |
602adf40 | 4484 | disk->major = rbd_dev->major; |
dd82fff1 | 4485 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
4486 | if (single_major) |
4487 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
4488 | disk->fops = &rbd_bd_ops; |
4489 | disk->private_data = rbd_dev; | |
4490 | ||
7ad18afa CH |
4491 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
4492 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 4493 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 4494 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 4495 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
4496 | rbd_dev->tag_set.nr_hw_queues = 1; |
4497 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
4498 | ||
4499 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
4500 | if (err) | |
602adf40 | 4501 | goto out_disk; |
029bcbd8 | 4502 | |
7ad18afa CH |
4503 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
4504 | if (IS_ERR(q)) { | |
4505 | err = PTR_ERR(q); | |
4506 | goto out_tag_set; | |
4507 | } | |
4508 | ||
d8a2c89c ID |
4509 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
4510 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ | |
593a9e7b | 4511 | |
029bcbd8 | 4512 | /* set io sizes to object size */ |
593a9e7b AE |
4513 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
4514 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
0d9fde4f | 4515 | q->limits.max_sectors = queue_max_hw_sectors(q); |
d3834fef | 4516 | blk_queue_max_segments(q, segment_size / SECTOR_SIZE); |
593a9e7b AE |
4517 | blk_queue_max_segment_size(q, segment_size); |
4518 | blk_queue_io_min(q, segment_size); | |
4519 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 4520 | |
90e98c52 GZ |
4521 | /* enable the discard support */ |
4522 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
4523 | q->limits.discard_granularity = segment_size; | |
4524 | q->limits.discard_alignment = segment_size; | |
2bb4cd5c | 4525 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
b76f8239 | 4526 | q->limits.discard_zeroes_data = 1; |
90e98c52 | 4527 | |
bae818ee RH |
4528 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
4529 | q->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES; | |
4530 | ||
602adf40 YS |
4531 | disk->queue = q; |
4532 | ||
4533 | q->queuedata = rbd_dev; | |
4534 | ||
4535 | rbd_dev->disk = disk; | |
602adf40 | 4536 | |
602adf40 | 4537 | return 0; |
7ad18afa CH |
4538 | out_tag_set: |
4539 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
4540 | out_disk: |
4541 | put_disk(disk); | |
7ad18afa | 4542 | return err; |
602adf40 YS |
4543 | } |
4544 | ||
dfc5606d YS |
4545 | /* |
4546 | sysfs | |
4547 | */ | |
4548 | ||
593a9e7b AE |
4549 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
4550 | { | |
4551 | return container_of(dev, struct rbd_device, dev); | |
4552 | } | |
4553 | ||
dfc5606d YS |
4554 | static ssize_t rbd_size_show(struct device *dev, |
4555 | struct device_attribute *attr, char *buf) | |
4556 | { | |
593a9e7b | 4557 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 4558 | |
fc71d833 AE |
4559 | return sprintf(buf, "%llu\n", |
4560 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
4561 | } |
4562 | ||
34b13184 AE |
4563 | /* |
4564 | * Note this shows the features for whatever's mapped, which is not | |
4565 | * necessarily the base image. | |
4566 | */ | |
4567 | static ssize_t rbd_features_show(struct device *dev, | |
4568 | struct device_attribute *attr, char *buf) | |
4569 | { | |
4570 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4571 | ||
4572 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4573 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4574 | } |
4575 | ||
dfc5606d YS |
4576 | static ssize_t rbd_major_show(struct device *dev, |
4577 | struct device_attribute *attr, char *buf) | |
4578 | { | |
593a9e7b | 4579 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4580 | |
fc71d833 AE |
4581 | if (rbd_dev->major) |
4582 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4583 | ||
4584 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4585 | } |
4586 | ||
4587 | static ssize_t rbd_minor_show(struct device *dev, | |
4588 | struct device_attribute *attr, char *buf) | |
4589 | { | |
4590 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4591 | |
dd82fff1 | 4592 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4593 | } |
4594 | ||
005a07bf ID |
4595 | static ssize_t rbd_client_addr_show(struct device *dev, |
4596 | struct device_attribute *attr, char *buf) | |
4597 | { | |
4598 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4599 | struct ceph_entity_addr *client_addr = | |
4600 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4601 | ||
4602 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4603 | le32_to_cpu(client_addr->nonce)); | |
4604 | } | |
4605 | ||
dfc5606d YS |
4606 | static ssize_t rbd_client_id_show(struct device *dev, |
4607 | struct device_attribute *attr, char *buf) | |
602adf40 | 4608 | { |
593a9e7b | 4609 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4610 | |
1dbb4399 | 4611 | return sprintf(buf, "client%lld\n", |
033268a5 | 4612 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4613 | } |
4614 | ||
267fb90b MC |
4615 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4616 | struct device_attribute *attr, char *buf) | |
4617 | { | |
4618 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4619 | ||
4620 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4621 | } | |
4622 | ||
dfc5606d YS |
4623 | static ssize_t rbd_pool_show(struct device *dev, |
4624 | struct device_attribute *attr, char *buf) | |
602adf40 | 4625 | { |
593a9e7b | 4626 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4627 | |
0d7dbfce | 4628 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4629 | } |
4630 | ||
9bb2f334 AE |
4631 | static ssize_t rbd_pool_id_show(struct device *dev, |
4632 | struct device_attribute *attr, char *buf) | |
4633 | { | |
4634 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4635 | ||
0d7dbfce | 4636 | return sprintf(buf, "%llu\n", |
fc71d833 | 4637 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4638 | } |
4639 | ||
dfc5606d YS |
4640 | static ssize_t rbd_name_show(struct device *dev, |
4641 | struct device_attribute *attr, char *buf) | |
4642 | { | |
593a9e7b | 4643 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4644 | |
a92ffdf8 AE |
4645 | if (rbd_dev->spec->image_name) |
4646 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4647 | ||
4648 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4649 | } |
4650 | ||
589d30e0 AE |
4651 | static ssize_t rbd_image_id_show(struct device *dev, |
4652 | struct device_attribute *attr, char *buf) | |
4653 | { | |
4654 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4655 | ||
0d7dbfce | 4656 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4657 | } |
4658 | ||
34b13184 AE |
4659 | /* |
4660 | * Shows the name of the currently-mapped snapshot (or | |
4661 | * RBD_SNAP_HEAD_NAME for the base image). | |
4662 | */ | |
dfc5606d YS |
4663 | static ssize_t rbd_snap_show(struct device *dev, |
4664 | struct device_attribute *attr, | |
4665 | char *buf) | |
4666 | { | |
593a9e7b | 4667 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4668 | |
0d7dbfce | 4669 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4670 | } |
4671 | ||
92a58671 MC |
4672 | static ssize_t rbd_snap_id_show(struct device *dev, |
4673 | struct device_attribute *attr, char *buf) | |
4674 | { | |
4675 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4676 | ||
4677 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4678 | } | |
4679 | ||
86b00e0d | 4680 | /* |
ff96128f ID |
4681 | * For a v2 image, shows the chain of parent images, separated by empty |
4682 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4683 | * image)". | |
86b00e0d AE |
4684 | */ |
4685 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4686 | struct device_attribute *attr, |
4687 | char *buf) | |
86b00e0d AE |
4688 | { |
4689 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4690 | ssize_t count = 0; |
86b00e0d | 4691 | |
ff96128f | 4692 | if (!rbd_dev->parent) |
86b00e0d AE |
4693 | return sprintf(buf, "(no parent image)\n"); |
4694 | ||
ff96128f ID |
4695 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4696 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4697 | ||
4698 | count += sprintf(&buf[count], "%s" | |
4699 | "pool_id %llu\npool_name %s\n" | |
4700 | "image_id %s\nimage_name %s\n" | |
4701 | "snap_id %llu\nsnap_name %s\n" | |
4702 | "overlap %llu\n", | |
4703 | !count ? "" : "\n", /* first? */ | |
4704 | spec->pool_id, spec->pool_name, | |
4705 | spec->image_id, spec->image_name ?: "(unknown)", | |
4706 | spec->snap_id, spec->snap_name, | |
4707 | rbd_dev->parent_overlap); | |
4708 | } | |
4709 | ||
4710 | return count; | |
86b00e0d AE |
4711 | } |
4712 | ||
dfc5606d YS |
4713 | static ssize_t rbd_image_refresh(struct device *dev, |
4714 | struct device_attribute *attr, | |
4715 | const char *buf, | |
4716 | size_t size) | |
4717 | { | |
593a9e7b | 4718 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4719 | int ret; |
602adf40 | 4720 | |
cc4a38bd | 4721 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4722 | if (ret) |
52bb1f9b | 4723 | return ret; |
b813623a | 4724 | |
52bb1f9b | 4725 | return size; |
dfc5606d | 4726 | } |
602adf40 | 4727 | |
dfc5606d | 4728 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 4729 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 4730 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 4731 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
005a07bf | 4732 | static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
dfc5606d | 4733 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
267fb90b | 4734 | static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
dfc5606d | 4735 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
9bb2f334 | 4736 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 4737 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 4738 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
4739 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
4740 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
92a58671 | 4741 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
86b00e0d | 4742 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
4743 | |
4744 | static struct attribute *rbd_attrs[] = { | |
4745 | &dev_attr_size.attr, | |
34b13184 | 4746 | &dev_attr_features.attr, |
dfc5606d | 4747 | &dev_attr_major.attr, |
dd82fff1 | 4748 | &dev_attr_minor.attr, |
005a07bf | 4749 | &dev_attr_client_addr.attr, |
dfc5606d | 4750 | &dev_attr_client_id.attr, |
267fb90b | 4751 | &dev_attr_cluster_fsid.attr, |
dfc5606d | 4752 | &dev_attr_pool.attr, |
9bb2f334 | 4753 | &dev_attr_pool_id.attr, |
dfc5606d | 4754 | &dev_attr_name.attr, |
589d30e0 | 4755 | &dev_attr_image_id.attr, |
dfc5606d | 4756 | &dev_attr_current_snap.attr, |
92a58671 | 4757 | &dev_attr_snap_id.attr, |
86b00e0d | 4758 | &dev_attr_parent.attr, |
dfc5606d | 4759 | &dev_attr_refresh.attr, |
dfc5606d YS |
4760 | NULL |
4761 | }; | |
4762 | ||
4763 | static struct attribute_group rbd_attr_group = { | |
4764 | .attrs = rbd_attrs, | |
4765 | }; | |
4766 | ||
4767 | static const struct attribute_group *rbd_attr_groups[] = { | |
4768 | &rbd_attr_group, | |
4769 | NULL | |
4770 | }; | |
4771 | ||
6cac4695 | 4772 | static void rbd_dev_release(struct device *dev); |
dfc5606d YS |
4773 | |
4774 | static struct device_type rbd_device_type = { | |
4775 | .name = "rbd", | |
4776 | .groups = rbd_attr_groups, | |
6cac4695 | 4777 | .release = rbd_dev_release, |
dfc5606d YS |
4778 | }; |
4779 | ||
8b8fb99c AE |
4780 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4781 | { | |
4782 | kref_get(&spec->kref); | |
4783 | ||
4784 | return spec; | |
4785 | } | |
4786 | ||
4787 | static void rbd_spec_free(struct kref *kref); | |
4788 | static void rbd_spec_put(struct rbd_spec *spec) | |
4789 | { | |
4790 | if (spec) | |
4791 | kref_put(&spec->kref, rbd_spec_free); | |
4792 | } | |
4793 | ||
4794 | static struct rbd_spec *rbd_spec_alloc(void) | |
4795 | { | |
4796 | struct rbd_spec *spec; | |
4797 | ||
4798 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4799 | if (!spec) | |
4800 | return NULL; | |
04077599 ID |
4801 | |
4802 | spec->pool_id = CEPH_NOPOOL; | |
4803 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4804 | kref_init(&spec->kref); |
4805 | ||
8b8fb99c AE |
4806 | return spec; |
4807 | } | |
4808 | ||
4809 | static void rbd_spec_free(struct kref *kref) | |
4810 | { | |
4811 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4812 | ||
4813 | kfree(spec->pool_name); | |
4814 | kfree(spec->image_id); | |
4815 | kfree(spec->image_name); | |
4816 | kfree(spec->snap_name); | |
4817 | kfree(spec); | |
4818 | } | |
4819 | ||
1643dfa4 | 4820 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4821 | { |
99d16943 | 4822 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4823 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
99d16943 | 4824 | |
c41d13a3 | 4825 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4826 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
c41d13a3 | 4827 | |
dd5ac32d ID |
4828 | rbd_put_client(rbd_dev->rbd_client); |
4829 | rbd_spec_put(rbd_dev->spec); | |
4830 | kfree(rbd_dev->opts); | |
4831 | kfree(rbd_dev); | |
1643dfa4 ID |
4832 | } |
4833 | ||
4834 | static void rbd_dev_release(struct device *dev) | |
4835 | { | |
4836 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4837 | bool need_put = !!rbd_dev->opts; | |
4838 | ||
4839 | if (need_put) { | |
4840 | destroy_workqueue(rbd_dev->task_wq); | |
4841 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4842 | } | |
4843 | ||
4844 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4845 | |
4846 | /* | |
4847 | * This is racy, but way better than putting module outside of | |
4848 | * the release callback. The race window is pretty small, so | |
4849 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4850 | */ | |
4851 | if (need_put) | |
4852 | module_put(THIS_MODULE); | |
4853 | } | |
4854 | ||
1643dfa4 ID |
4855 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4856 | struct rbd_spec *spec) | |
c53d5893 AE |
4857 | { |
4858 | struct rbd_device *rbd_dev; | |
4859 | ||
1643dfa4 | 4860 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4861 | if (!rbd_dev) |
4862 | return NULL; | |
4863 | ||
4864 | spin_lock_init(&rbd_dev->lock); | |
4865 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4866 | init_rwsem(&rbd_dev->header_rwsem); |
4867 | ||
c41d13a3 | 4868 | ceph_oid_init(&rbd_dev->header_oid); |
922dab61 | 4869 | ceph_oloc_init(&rbd_dev->header_oloc); |
c41d13a3 | 4870 | |
99d16943 ID |
4871 | mutex_init(&rbd_dev->watch_mutex); |
4872 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4873 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4874 | ||
ed95b21a ID |
4875 | init_rwsem(&rbd_dev->lock_rwsem); |
4876 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4877 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4878 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4879 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4880 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4881 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4882 | ||
dd5ac32d ID |
4883 | rbd_dev->dev.bus = &rbd_bus_type; |
4884 | rbd_dev->dev.type = &rbd_device_type; | |
4885 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4886 | device_initialize(&rbd_dev->dev); |
4887 | ||
c53d5893 | 4888 | rbd_dev->rbd_client = rbdc; |
d147543d | 4889 | rbd_dev->spec = spec; |
0903e875 | 4890 | |
7627151e YZ |
4891 | rbd_dev->layout.stripe_unit = 1 << RBD_MAX_OBJ_ORDER; |
4892 | rbd_dev->layout.stripe_count = 1; | |
4893 | rbd_dev->layout.object_size = 1 << RBD_MAX_OBJ_ORDER; | |
4894 | rbd_dev->layout.pool_id = spec->pool_id; | |
30c156d9 | 4895 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
0903e875 | 4896 | |
1643dfa4 ID |
4897 | return rbd_dev; |
4898 | } | |
4899 | ||
4900 | /* | |
4901 | * Create a mapping rbd_dev. | |
4902 | */ | |
4903 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4904 | struct rbd_spec *spec, | |
4905 | struct rbd_options *opts) | |
4906 | { | |
4907 | struct rbd_device *rbd_dev; | |
4908 | ||
4909 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4910 | if (!rbd_dev) | |
4911 | return NULL; | |
4912 | ||
4913 | rbd_dev->opts = opts; | |
4914 | ||
4915 | /* get an id and fill in device name */ | |
4916 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4917 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4918 | GFP_KERNEL); | |
4919 | if (rbd_dev->dev_id < 0) | |
4920 | goto fail_rbd_dev; | |
4921 | ||
4922 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4923 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4924 | rbd_dev->name); | |
4925 | if (!rbd_dev->task_wq) | |
4926 | goto fail_dev_id; | |
dd5ac32d | 4927 | |
1643dfa4 ID |
4928 | /* we have a ref from do_rbd_add() */ |
4929 | __module_get(THIS_MODULE); | |
4930 | ||
4931 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); | |
c53d5893 | 4932 | return rbd_dev; |
1643dfa4 ID |
4933 | |
4934 | fail_dev_id: | |
4935 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4936 | fail_rbd_dev: | |
4937 | rbd_dev_free(rbd_dev); | |
4938 | return NULL; | |
c53d5893 AE |
4939 | } |
4940 | ||
4941 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4942 | { | |
dd5ac32d ID |
4943 | if (rbd_dev) |
4944 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4945 | } |
4946 | ||
9d475de5 AE |
4947 | /* |
4948 | * Get the size and object order for an image snapshot, or if | |
4949 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4950 | * image. | |
4951 | */ | |
4952 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4953 | u8 *order, u64 *snap_size) | |
4954 | { | |
4955 | __le64 snapid = cpu_to_le64(snap_id); | |
4956 | int ret; | |
4957 | struct { | |
4958 | u8 order; | |
4959 | __le64 size; | |
4960 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4961 | ||
c41d13a3 | 4962 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
9d475de5 | 4963 | "rbd", "get_size", |
4157976b | 4964 | &snapid, sizeof (snapid), |
e2a58ee5 | 4965 | &size_buf, sizeof (size_buf)); |
36be9a76 | 4966 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4967 | if (ret < 0) |
4968 | return ret; | |
57385b51 AE |
4969 | if (ret < sizeof (size_buf)) |
4970 | return -ERANGE; | |
9d475de5 | 4971 | |
c3545579 | 4972 | if (order) { |
c86f86e9 | 4973 | *order = size_buf.order; |
c3545579 JD |
4974 | dout(" order %u", (unsigned int)*order); |
4975 | } | |
9d475de5 AE |
4976 | *snap_size = le64_to_cpu(size_buf.size); |
4977 | ||
c3545579 JD |
4978 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4979 | (unsigned long long)snap_id, | |
57385b51 | 4980 | (unsigned long long)*snap_size); |
9d475de5 AE |
4981 | |
4982 | return 0; | |
4983 | } | |
4984 | ||
4985 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4986 | { | |
4987 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4988 | &rbd_dev->header.obj_order, | |
4989 | &rbd_dev->header.image_size); | |
4990 | } | |
4991 | ||
1e130199 AE |
4992 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4993 | { | |
4994 | void *reply_buf; | |
4995 | int ret; | |
4996 | void *p; | |
4997 | ||
4998 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4999 | if (!reply_buf) | |
5000 | return -ENOMEM; | |
5001 | ||
c41d13a3 | 5002 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
4157976b | 5003 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 5004 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 5005 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
5006 | if (ret < 0) |
5007 | goto out; | |
5008 | ||
5009 | p = reply_buf; | |
5010 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
5011 | p + ret, NULL, GFP_NOIO); |
5012 | ret = 0; | |
1e130199 AE |
5013 | |
5014 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
5015 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
5016 | rbd_dev->header.object_prefix = NULL; | |
5017 | } else { | |
5018 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
5019 | } | |
1e130199 AE |
5020 | out: |
5021 | kfree(reply_buf); | |
5022 | ||
5023 | return ret; | |
5024 | } | |
5025 | ||
b1b5402a AE |
5026 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
5027 | u64 *snap_features) | |
5028 | { | |
5029 | __le64 snapid = cpu_to_le64(snap_id); | |
5030 | struct { | |
5031 | __le64 features; | |
5032 | __le64 incompat; | |
4157976b | 5033 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 5034 | u64 unsup; |
b1b5402a AE |
5035 | int ret; |
5036 | ||
c41d13a3 | 5037 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
b1b5402a | 5038 | "rbd", "get_features", |
4157976b | 5039 | &snapid, sizeof (snapid), |
e2a58ee5 | 5040 | &features_buf, sizeof (features_buf)); |
36be9a76 | 5041 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
5042 | if (ret < 0) |
5043 | return ret; | |
57385b51 AE |
5044 | if (ret < sizeof (features_buf)) |
5045 | return -ERANGE; | |
d889140c | 5046 | |
d3767f0f ID |
5047 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
5048 | if (unsup) { | |
5049 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
5050 | unsup); | |
b8f5c6ed | 5051 | return -ENXIO; |
d3767f0f | 5052 | } |
d889140c | 5053 | |
b1b5402a AE |
5054 | *snap_features = le64_to_cpu(features_buf.features); |
5055 | ||
5056 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
5057 | (unsigned long long)snap_id, |
5058 | (unsigned long long)*snap_features, | |
5059 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
5060 | |
5061 | return 0; | |
5062 | } | |
5063 | ||
5064 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
5065 | { | |
5066 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
5067 | &rbd_dev->header.features); | |
5068 | } | |
5069 | ||
86b00e0d AE |
5070 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
5071 | { | |
5072 | struct rbd_spec *parent_spec; | |
5073 | size_t size; | |
5074 | void *reply_buf = NULL; | |
5075 | __le64 snapid; | |
5076 | void *p; | |
5077 | void *end; | |
642a2537 | 5078 | u64 pool_id; |
86b00e0d | 5079 | char *image_id; |
3b5cf2a2 | 5080 | u64 snap_id; |
86b00e0d | 5081 | u64 overlap; |
86b00e0d AE |
5082 | int ret; |
5083 | ||
5084 | parent_spec = rbd_spec_alloc(); | |
5085 | if (!parent_spec) | |
5086 | return -ENOMEM; | |
5087 | ||
5088 | size = sizeof (__le64) + /* pool_id */ | |
5089 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
5090 | sizeof (__le64) + /* snap_id */ | |
5091 | sizeof (__le64); /* overlap */ | |
5092 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5093 | if (!reply_buf) { | |
5094 | ret = -ENOMEM; | |
5095 | goto out_err; | |
5096 | } | |
5097 | ||
4d9b67cd | 5098 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
c41d13a3 | 5099 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
86b00e0d | 5100 | "rbd", "get_parent", |
4157976b | 5101 | &snapid, sizeof (snapid), |
e2a58ee5 | 5102 | reply_buf, size); |
36be9a76 | 5103 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
5104 | if (ret < 0) |
5105 | goto out_err; | |
5106 | ||
86b00e0d | 5107 | p = reply_buf; |
57385b51 AE |
5108 | end = reply_buf + ret; |
5109 | ret = -ERANGE; | |
642a2537 | 5110 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
5111 | if (pool_id == CEPH_NOPOOL) { |
5112 | /* | |
5113 | * Either the parent never existed, or we have | |
5114 | * record of it but the image got flattened so it no | |
5115 | * longer has a parent. When the parent of a | |
5116 | * layered image disappears we immediately set the | |
5117 | * overlap to 0. The effect of this is that all new | |
5118 | * requests will be treated as if the image had no | |
5119 | * parent. | |
5120 | */ | |
5121 | if (rbd_dev->parent_overlap) { | |
5122 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
5123 | rbd_dev_parent_put(rbd_dev); |
5124 | pr_info("%s: clone image has been flattened\n", | |
5125 | rbd_dev->disk->disk_name); | |
5126 | } | |
5127 | ||
86b00e0d | 5128 | goto out; /* No parent? No problem. */ |
392a9dad | 5129 | } |
86b00e0d | 5130 | |
0903e875 AE |
5131 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5132 | ||
5133 | ret = -EIO; | |
642a2537 | 5134 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 5135 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 5136 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 5137 | goto out_err; |
c0cd10db | 5138 | } |
0903e875 | 5139 | |
979ed480 | 5140 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
5141 | if (IS_ERR(image_id)) { |
5142 | ret = PTR_ERR(image_id); | |
5143 | goto out_err; | |
5144 | } | |
3b5cf2a2 | 5145 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
5146 | ceph_decode_64_safe(&p, end, overlap, out_err); |
5147 | ||
3b5cf2a2 AE |
5148 | /* |
5149 | * The parent won't change (except when the clone is | |
5150 | * flattened, already handled that). So we only need to | |
5151 | * record the parent spec we have not already done so. | |
5152 | */ | |
5153 | if (!rbd_dev->parent_spec) { | |
5154 | parent_spec->pool_id = pool_id; | |
5155 | parent_spec->image_id = image_id; | |
5156 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
5157 | rbd_dev->parent_spec = parent_spec; |
5158 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
5159 | } else { |
5160 | kfree(image_id); | |
3b5cf2a2 AE |
5161 | } |
5162 | ||
5163 | /* | |
cf32bd9c ID |
5164 | * We always update the parent overlap. If it's zero we issue |
5165 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 5166 | */ |
3b5cf2a2 | 5167 | if (!overlap) { |
3b5cf2a2 | 5168 | if (parent_spec) { |
cf32bd9c ID |
5169 | /* refresh, careful to warn just once */ |
5170 | if (rbd_dev->parent_overlap) | |
5171 | rbd_warn(rbd_dev, | |
5172 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 5173 | } else { |
cf32bd9c ID |
5174 | /* initial probe */ |
5175 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 5176 | } |
70cf49cf | 5177 | } |
cf32bd9c ID |
5178 | rbd_dev->parent_overlap = overlap; |
5179 | ||
86b00e0d AE |
5180 | out: |
5181 | ret = 0; | |
5182 | out_err: | |
5183 | kfree(reply_buf); | |
5184 | rbd_spec_put(parent_spec); | |
5185 | ||
5186 | return ret; | |
5187 | } | |
5188 | ||
cc070d59 AE |
5189 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
5190 | { | |
5191 | struct { | |
5192 | __le64 stripe_unit; | |
5193 | __le64 stripe_count; | |
5194 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
5195 | size_t size = sizeof (striping_info_buf); | |
5196 | void *p; | |
5197 | u64 obj_size; | |
5198 | u64 stripe_unit; | |
5199 | u64 stripe_count; | |
5200 | int ret; | |
5201 | ||
c41d13a3 | 5202 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
cc070d59 | 5203 | "rbd", "get_stripe_unit_count", NULL, 0, |
e2a58ee5 | 5204 | (char *)&striping_info_buf, size); |
cc070d59 AE |
5205 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
5206 | if (ret < 0) | |
5207 | return ret; | |
5208 | if (ret < size) | |
5209 | return -ERANGE; | |
5210 | ||
5211 | /* | |
5212 | * We don't actually support the "fancy striping" feature | |
5213 | * (STRIPINGV2) yet, but if the striping sizes are the | |
5214 | * defaults the behavior is the same as before. So find | |
5215 | * out, and only fail if the image has non-default values. | |
5216 | */ | |
5217 | ret = -EINVAL; | |
5218 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
5219 | p = &striping_info_buf; | |
5220 | stripe_unit = ceph_decode_64(&p); | |
5221 | if (stripe_unit != obj_size) { | |
5222 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
5223 | "(got %llu want %llu)", | |
5224 | stripe_unit, obj_size); | |
5225 | return -EINVAL; | |
5226 | } | |
5227 | stripe_count = ceph_decode_64(&p); | |
5228 | if (stripe_count != 1) { | |
5229 | rbd_warn(rbd_dev, "unsupported stripe count " | |
5230 | "(got %llu want 1)", stripe_count); | |
5231 | return -EINVAL; | |
5232 | } | |
500d0c0f AE |
5233 | rbd_dev->header.stripe_unit = stripe_unit; |
5234 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
5235 | |
5236 | return 0; | |
5237 | } | |
5238 | ||
9e15b77d AE |
5239 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
5240 | { | |
5241 | size_t image_id_size; | |
5242 | char *image_id; | |
5243 | void *p; | |
5244 | void *end; | |
5245 | size_t size; | |
5246 | void *reply_buf = NULL; | |
5247 | size_t len = 0; | |
5248 | char *image_name = NULL; | |
5249 | int ret; | |
5250 | ||
5251 | rbd_assert(!rbd_dev->spec->image_name); | |
5252 | ||
69e7a02f AE |
5253 | len = strlen(rbd_dev->spec->image_id); |
5254 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
5255 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
5256 | if (!image_id) | |
5257 | return NULL; | |
5258 | ||
5259 | p = image_id; | |
4157976b | 5260 | end = image_id + image_id_size; |
57385b51 | 5261 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
5262 | |
5263 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
5264 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5265 | if (!reply_buf) | |
5266 | goto out; | |
5267 | ||
36be9a76 | 5268 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
5269 | "rbd", "dir_get_name", |
5270 | image_id, image_id_size, | |
e2a58ee5 | 5271 | reply_buf, size); |
9e15b77d AE |
5272 | if (ret < 0) |
5273 | goto out; | |
5274 | p = reply_buf; | |
f40eb349 AE |
5275 | end = reply_buf + ret; |
5276 | ||
9e15b77d AE |
5277 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
5278 | if (IS_ERR(image_name)) | |
5279 | image_name = NULL; | |
5280 | else | |
5281 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
5282 | out: | |
5283 | kfree(reply_buf); | |
5284 | kfree(image_id); | |
5285 | ||
5286 | return image_name; | |
5287 | } | |
5288 | ||
2ad3d716 AE |
5289 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
5290 | { | |
5291 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5292 | const char *snap_name; | |
5293 | u32 which = 0; | |
5294 | ||
5295 | /* Skip over names until we find the one we are looking for */ | |
5296 | ||
5297 | snap_name = rbd_dev->header.snap_names; | |
5298 | while (which < snapc->num_snaps) { | |
5299 | if (!strcmp(name, snap_name)) | |
5300 | return snapc->snaps[which]; | |
5301 | snap_name += strlen(snap_name) + 1; | |
5302 | which++; | |
5303 | } | |
5304 | return CEPH_NOSNAP; | |
5305 | } | |
5306 | ||
5307 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5308 | { | |
5309 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5310 | u32 which; | |
5311 | bool found = false; | |
5312 | u64 snap_id; | |
5313 | ||
5314 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
5315 | const char *snap_name; | |
5316 | ||
5317 | snap_id = snapc->snaps[which]; | |
5318 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
5319 | if (IS_ERR(snap_name)) { |
5320 | /* ignore no-longer existing snapshots */ | |
5321 | if (PTR_ERR(snap_name) == -ENOENT) | |
5322 | continue; | |
5323 | else | |
5324 | break; | |
5325 | } | |
2ad3d716 AE |
5326 | found = !strcmp(name, snap_name); |
5327 | kfree(snap_name); | |
5328 | } | |
5329 | return found ? snap_id : CEPH_NOSNAP; | |
5330 | } | |
5331 | ||
5332 | /* | |
5333 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
5334 | * no snapshot by that name is found, or if an error occurs. | |
5335 | */ | |
5336 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5337 | { | |
5338 | if (rbd_dev->image_format == 1) | |
5339 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
5340 | ||
5341 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
5342 | } | |
5343 | ||
9e15b77d | 5344 | /* |
04077599 ID |
5345 | * An image being mapped will have everything but the snap id. |
5346 | */ | |
5347 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
5348 | { | |
5349 | struct rbd_spec *spec = rbd_dev->spec; | |
5350 | ||
5351 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
5352 | rbd_assert(spec->image_id && spec->image_name); | |
5353 | rbd_assert(spec->snap_name); | |
5354 | ||
5355 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
5356 | u64 snap_id; | |
5357 | ||
5358 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
5359 | if (snap_id == CEPH_NOSNAP) | |
5360 | return -ENOENT; | |
5361 | ||
5362 | spec->snap_id = snap_id; | |
5363 | } else { | |
5364 | spec->snap_id = CEPH_NOSNAP; | |
5365 | } | |
5366 | ||
5367 | return 0; | |
5368 | } | |
5369 | ||
5370 | /* | |
5371 | * A parent image will have all ids but none of the names. | |
e1d4213f | 5372 | * |
04077599 ID |
5373 | * All names in an rbd spec are dynamically allocated. It's OK if we |
5374 | * can't figure out the name for an image id. | |
9e15b77d | 5375 | */ |
04077599 | 5376 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 5377 | { |
2e9f7f1c AE |
5378 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
5379 | struct rbd_spec *spec = rbd_dev->spec; | |
5380 | const char *pool_name; | |
5381 | const char *image_name; | |
5382 | const char *snap_name; | |
9e15b77d AE |
5383 | int ret; |
5384 | ||
04077599 ID |
5385 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
5386 | rbd_assert(spec->image_id); | |
5387 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 5388 | |
2e9f7f1c | 5389 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 5390 | |
2e9f7f1c AE |
5391 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
5392 | if (!pool_name) { | |
5393 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
5394 | return -EIO; |
5395 | } | |
2e9f7f1c AE |
5396 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
5397 | if (!pool_name) | |
9e15b77d AE |
5398 | return -ENOMEM; |
5399 | ||
5400 | /* Fetch the image name; tolerate failure here */ | |
5401 | ||
2e9f7f1c AE |
5402 | image_name = rbd_dev_image_name(rbd_dev); |
5403 | if (!image_name) | |
06ecc6cb | 5404 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 5405 | |
04077599 | 5406 | /* Fetch the snapshot name */ |
9e15b77d | 5407 | |
2e9f7f1c | 5408 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
5409 | if (IS_ERR(snap_name)) { |
5410 | ret = PTR_ERR(snap_name); | |
9e15b77d | 5411 | goto out_err; |
2e9f7f1c AE |
5412 | } |
5413 | ||
5414 | spec->pool_name = pool_name; | |
5415 | spec->image_name = image_name; | |
5416 | spec->snap_name = snap_name; | |
9e15b77d AE |
5417 | |
5418 | return 0; | |
04077599 | 5419 | |
9e15b77d | 5420 | out_err: |
2e9f7f1c AE |
5421 | kfree(image_name); |
5422 | kfree(pool_name); | |
9e15b77d AE |
5423 | return ret; |
5424 | } | |
5425 | ||
cc4a38bd | 5426 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
5427 | { |
5428 | size_t size; | |
5429 | int ret; | |
5430 | void *reply_buf; | |
5431 | void *p; | |
5432 | void *end; | |
5433 | u64 seq; | |
5434 | u32 snap_count; | |
5435 | struct ceph_snap_context *snapc; | |
5436 | u32 i; | |
5437 | ||
5438 | /* | |
5439 | * We'll need room for the seq value (maximum snapshot id), | |
5440 | * snapshot count, and array of that many snapshot ids. | |
5441 | * For now we have a fixed upper limit on the number we're | |
5442 | * prepared to receive. | |
5443 | */ | |
5444 | size = sizeof (__le64) + sizeof (__le32) + | |
5445 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
5446 | reply_buf = kzalloc(size, GFP_KERNEL); | |
5447 | if (!reply_buf) | |
5448 | return -ENOMEM; | |
5449 | ||
c41d13a3 | 5450 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
4157976b | 5451 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 5452 | reply_buf, size); |
36be9a76 | 5453 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
5454 | if (ret < 0) |
5455 | goto out; | |
5456 | ||
35d489f9 | 5457 | p = reply_buf; |
57385b51 AE |
5458 | end = reply_buf + ret; |
5459 | ret = -ERANGE; | |
35d489f9 AE |
5460 | ceph_decode_64_safe(&p, end, seq, out); |
5461 | ceph_decode_32_safe(&p, end, snap_count, out); | |
5462 | ||
5463 | /* | |
5464 | * Make sure the reported number of snapshot ids wouldn't go | |
5465 | * beyond the end of our buffer. But before checking that, | |
5466 | * make sure the computed size of the snapshot context we | |
5467 | * allocate is representable in a size_t. | |
5468 | */ | |
5469 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
5470 | / sizeof (u64)) { | |
5471 | ret = -EINVAL; | |
5472 | goto out; | |
5473 | } | |
5474 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
5475 | goto out; | |
468521c1 | 5476 | ret = 0; |
35d489f9 | 5477 | |
812164f8 | 5478 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
5479 | if (!snapc) { |
5480 | ret = -ENOMEM; | |
5481 | goto out; | |
5482 | } | |
35d489f9 | 5483 | snapc->seq = seq; |
35d489f9 AE |
5484 | for (i = 0; i < snap_count; i++) |
5485 | snapc->snaps[i] = ceph_decode_64(&p); | |
5486 | ||
49ece554 | 5487 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
5488 | rbd_dev->header.snapc = snapc; |
5489 | ||
5490 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 5491 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
5492 | out: |
5493 | kfree(reply_buf); | |
5494 | ||
57385b51 | 5495 | return ret; |
35d489f9 AE |
5496 | } |
5497 | ||
54cac61f AE |
5498 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
5499 | u64 snap_id) | |
b8b1e2db AE |
5500 | { |
5501 | size_t size; | |
5502 | void *reply_buf; | |
54cac61f | 5503 | __le64 snapid; |
b8b1e2db AE |
5504 | int ret; |
5505 | void *p; | |
5506 | void *end; | |
b8b1e2db AE |
5507 | char *snap_name; |
5508 | ||
5509 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
5510 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5511 | if (!reply_buf) | |
5512 | return ERR_PTR(-ENOMEM); | |
5513 | ||
54cac61f | 5514 | snapid = cpu_to_le64(snap_id); |
c41d13a3 | 5515 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
b8b1e2db | 5516 | "rbd", "get_snapshot_name", |
54cac61f | 5517 | &snapid, sizeof (snapid), |
e2a58ee5 | 5518 | reply_buf, size); |
36be9a76 | 5519 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
5520 | if (ret < 0) { |
5521 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 5522 | goto out; |
f40eb349 | 5523 | } |
b8b1e2db AE |
5524 | |
5525 | p = reply_buf; | |
f40eb349 | 5526 | end = reply_buf + ret; |
e5c35534 | 5527 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 5528 | if (IS_ERR(snap_name)) |
b8b1e2db | 5529 | goto out; |
b8b1e2db | 5530 | |
f40eb349 | 5531 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 5532 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
5533 | out: |
5534 | kfree(reply_buf); | |
5535 | ||
f40eb349 | 5536 | return snap_name; |
b8b1e2db AE |
5537 | } |
5538 | ||
2df3fac7 | 5539 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 5540 | { |
2df3fac7 | 5541 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 5542 | int ret; |
117973fb | 5543 | |
1617e40c JD |
5544 | ret = rbd_dev_v2_image_size(rbd_dev); |
5545 | if (ret) | |
cfbf6377 | 5546 | return ret; |
1617e40c | 5547 | |
2df3fac7 AE |
5548 | if (first_time) { |
5549 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5550 | if (ret) | |
cfbf6377 | 5551 | return ret; |
2df3fac7 AE |
5552 | } |
5553 | ||
cc4a38bd | 5554 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5555 | if (ret && first_time) { |
5556 | kfree(rbd_dev->header.object_prefix); | |
5557 | rbd_dev->header.object_prefix = NULL; | |
5558 | } | |
117973fb AE |
5559 | |
5560 | return ret; | |
5561 | } | |
5562 | ||
a720ae09 ID |
5563 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5564 | { | |
5565 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5566 | ||
5567 | if (rbd_dev->image_format == 1) | |
5568 | return rbd_dev_v1_header_info(rbd_dev); | |
5569 | ||
5570 | return rbd_dev_v2_header_info(rbd_dev); | |
5571 | } | |
5572 | ||
e28fff26 AE |
5573 | /* |
5574 | * Skips over white space at *buf, and updates *buf to point to the | |
5575 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5576 | * the token (string of non-white space characters) found. Note |
5577 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5578 | */ |
5579 | static inline size_t next_token(const char **buf) | |
5580 | { | |
5581 | /* | |
5582 | * These are the characters that produce nonzero for | |
5583 | * isspace() in the "C" and "POSIX" locales. | |
5584 | */ | |
5585 | const char *spaces = " \f\n\r\t\v"; | |
5586 | ||
5587 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5588 | ||
5589 | return strcspn(*buf, spaces); /* Return token length */ | |
5590 | } | |
5591 | ||
ea3352f4 AE |
5592 | /* |
5593 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5594 | * enough to hold a copy of it, and copies the token into the new | |
5595 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5596 | * that a duplicate buffer is created even for a zero-length token. | |
5597 | * | |
5598 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5599 | * pointer if memory for the duplicate was not available. If | |
5600 | * the lenp argument is a non-null pointer, the length of the token | |
5601 | * (not including the '\0') is returned in *lenp. | |
5602 | * | |
5603 | * If successful, the *buf pointer will be updated to point beyond | |
5604 | * the end of the found token. | |
5605 | * | |
5606 | * Note: uses GFP_KERNEL for allocation. | |
5607 | */ | |
5608 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5609 | { | |
5610 | char *dup; | |
5611 | size_t len; | |
5612 | ||
5613 | len = next_token(buf); | |
4caf35f9 | 5614 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5615 | if (!dup) |
5616 | return NULL; | |
ea3352f4 AE |
5617 | *(dup + len) = '\0'; |
5618 | *buf += len; | |
5619 | ||
5620 | if (lenp) | |
5621 | *lenp = len; | |
5622 | ||
5623 | return dup; | |
5624 | } | |
5625 | ||
a725f65e | 5626 | /* |
859c31df AE |
5627 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5628 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5629 | * and the data written is passed here via a NUL-terminated buffer. | |
5630 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5631 | * |
859c31df AE |
5632 | * The information extracted from these options is recorded in |
5633 | * the other parameters which return dynamically-allocated | |
5634 | * structures: | |
5635 | * ceph_opts | |
5636 | * The address of a pointer that will refer to a ceph options | |
5637 | * structure. Caller must release the returned pointer using | |
5638 | * ceph_destroy_options() when it is no longer needed. | |
5639 | * rbd_opts | |
5640 | * Address of an rbd options pointer. Fully initialized by | |
5641 | * this function; caller must release with kfree(). | |
5642 | * spec | |
5643 | * Address of an rbd image specification pointer. Fully | |
5644 | * initialized by this function based on parsed options. | |
5645 | * Caller must release with rbd_spec_put(). | |
5646 | * | |
5647 | * The options passed take this form: | |
5648 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5649 | * where: | |
5650 | * <mon_addrs> | |
5651 | * A comma-separated list of one or more monitor addresses. | |
5652 | * A monitor address is an ip address, optionally followed | |
5653 | * by a port number (separated by a colon). | |
5654 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5655 | * <options> | |
5656 | * A comma-separated list of ceph and/or rbd options. | |
5657 | * <pool_name> | |
5658 | * The name of the rados pool containing the rbd image. | |
5659 | * <image_name> | |
5660 | * The name of the image in that pool to map. | |
5661 | * <snap_id> | |
5662 | * An optional snapshot id. If provided, the mapping will | |
5663 | * present data from the image at the time that snapshot was | |
5664 | * created. The image head is used if no snapshot id is | |
5665 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5666 | */ |
859c31df | 5667 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5668 | struct ceph_options **ceph_opts, |
859c31df AE |
5669 | struct rbd_options **opts, |
5670 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5671 | { |
d22f76e7 | 5672 | size_t len; |
859c31df | 5673 | char *options; |
0ddebc0c | 5674 | const char *mon_addrs; |
ecb4dc22 | 5675 | char *snap_name; |
0ddebc0c | 5676 | size_t mon_addrs_size; |
859c31df | 5677 | struct rbd_spec *spec = NULL; |
4e9afeba | 5678 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5679 | struct ceph_options *copts; |
dc79b113 | 5680 | int ret; |
e28fff26 AE |
5681 | |
5682 | /* The first four tokens are required */ | |
5683 | ||
7ef3214a | 5684 | len = next_token(&buf); |
4fb5d671 AE |
5685 | if (!len) { |
5686 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5687 | return -EINVAL; | |
5688 | } | |
0ddebc0c | 5689 | mon_addrs = buf; |
f28e565a | 5690 | mon_addrs_size = len + 1; |
7ef3214a | 5691 | buf += len; |
a725f65e | 5692 | |
dc79b113 | 5693 | ret = -EINVAL; |
f28e565a AE |
5694 | options = dup_token(&buf, NULL); |
5695 | if (!options) | |
dc79b113 | 5696 | return -ENOMEM; |
4fb5d671 AE |
5697 | if (!*options) { |
5698 | rbd_warn(NULL, "no options provided"); | |
5699 | goto out_err; | |
5700 | } | |
e28fff26 | 5701 | |
859c31df AE |
5702 | spec = rbd_spec_alloc(); |
5703 | if (!spec) | |
f28e565a | 5704 | goto out_mem; |
859c31df AE |
5705 | |
5706 | spec->pool_name = dup_token(&buf, NULL); | |
5707 | if (!spec->pool_name) | |
5708 | goto out_mem; | |
4fb5d671 AE |
5709 | if (!*spec->pool_name) { |
5710 | rbd_warn(NULL, "no pool name provided"); | |
5711 | goto out_err; | |
5712 | } | |
e28fff26 | 5713 | |
69e7a02f | 5714 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 5715 | if (!spec->image_name) |
f28e565a | 5716 | goto out_mem; |
4fb5d671 AE |
5717 | if (!*spec->image_name) { |
5718 | rbd_warn(NULL, "no image name provided"); | |
5719 | goto out_err; | |
5720 | } | |
d4b125e9 | 5721 | |
f28e565a AE |
5722 | /* |
5723 | * Snapshot name is optional; default is to use "-" | |
5724 | * (indicating the head/no snapshot). | |
5725 | */ | |
3feeb894 | 5726 | len = next_token(&buf); |
820a5f3e | 5727 | if (!len) { |
3feeb894 AE |
5728 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5729 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5730 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5731 | ret = -ENAMETOOLONG; |
f28e565a | 5732 | goto out_err; |
849b4260 | 5733 | } |
ecb4dc22 AE |
5734 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5735 | if (!snap_name) | |
f28e565a | 5736 | goto out_mem; |
ecb4dc22 AE |
5737 | *(snap_name + len) = '\0'; |
5738 | spec->snap_name = snap_name; | |
e5c35534 | 5739 | |
0ddebc0c | 5740 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5741 | |
4e9afeba AE |
5742 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
5743 | if (!rbd_opts) | |
5744 | goto out_mem; | |
5745 | ||
5746 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 5747 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
d22f76e7 | 5748 | |
859c31df | 5749 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 5750 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 5751 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
5752 | if (IS_ERR(copts)) { |
5753 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5754 | goto out_err; |
5755 | } | |
859c31df AE |
5756 | kfree(options); |
5757 | ||
5758 | *ceph_opts = copts; | |
4e9afeba | 5759 | *opts = rbd_opts; |
859c31df | 5760 | *rbd_spec = spec; |
0ddebc0c | 5761 | |
dc79b113 | 5762 | return 0; |
f28e565a | 5763 | out_mem: |
dc79b113 | 5764 | ret = -ENOMEM; |
d22f76e7 | 5765 | out_err: |
859c31df AE |
5766 | kfree(rbd_opts); |
5767 | rbd_spec_put(spec); | |
f28e565a | 5768 | kfree(options); |
d22f76e7 | 5769 | |
dc79b113 | 5770 | return ret; |
a725f65e AE |
5771 | } |
5772 | ||
30ba1f02 ID |
5773 | /* |
5774 | * Return pool id (>= 0) or a negative error code. | |
5775 | */ | |
5776 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
5777 | { | |
a319bf56 | 5778 | struct ceph_options *opts = rbdc->client->options; |
30ba1f02 | 5779 | u64 newest_epoch; |
30ba1f02 ID |
5780 | int tries = 0; |
5781 | int ret; | |
5782 | ||
5783 | again: | |
5784 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
5785 | if (ret == -ENOENT && tries++ < 1) { | |
d0b19705 ID |
5786 | ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
5787 | &newest_epoch); | |
30ba1f02 ID |
5788 | if (ret < 0) |
5789 | return ret; | |
5790 | ||
5791 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
7cca78c9 | 5792 | ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
30ba1f02 | 5793 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
a319bf56 ID |
5794 | newest_epoch, |
5795 | opts->mount_timeout); | |
30ba1f02 ID |
5796 | goto again; |
5797 | } else { | |
5798 | /* the osdmap we have is new enough */ | |
5799 | return -ENOENT; | |
5800 | } | |
5801 | } | |
5802 | ||
5803 | return ret; | |
5804 | } | |
5805 | ||
589d30e0 AE |
5806 | /* |
5807 | * An rbd format 2 image has a unique identifier, distinct from the | |
5808 | * name given to it by the user. Internally, that identifier is | |
5809 | * what's used to specify the names of objects related to the image. | |
5810 | * | |
5811 | * A special "rbd id" object is used to map an rbd image name to its | |
5812 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5813 | * with the supplied name. | |
5814 | * | |
5815 | * This function will record the given rbd_dev's image_id field if | |
5816 | * it can be determined, and in that case will return 0. If any | |
5817 | * errors occur a negative errno will be returned and the rbd_dev's | |
5818 | * image_id field will be unchanged (and should be NULL). | |
5819 | */ | |
5820 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5821 | { | |
5822 | int ret; | |
5823 | size_t size; | |
5824 | char *object_name; | |
5825 | void *response; | |
c0fba368 | 5826 | char *image_id; |
2f82ee54 | 5827 | |
2c0d0a10 AE |
5828 | /* |
5829 | * When probing a parent image, the image id is already | |
5830 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5831 | * need to fetch the image id again in this case. We |
5832 | * do still need to set the image format though. | |
2c0d0a10 | 5833 | */ |
c0fba368 AE |
5834 | if (rbd_dev->spec->image_id) { |
5835 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5836 | ||
2c0d0a10 | 5837 | return 0; |
c0fba368 | 5838 | } |
2c0d0a10 | 5839 | |
589d30e0 AE |
5840 | /* |
5841 | * First, see if the format 2 image id file exists, and if | |
5842 | * so, get the image's persistent id from it. | |
5843 | */ | |
69e7a02f | 5844 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
5845 | object_name = kmalloc(size, GFP_NOIO); |
5846 | if (!object_name) | |
5847 | return -ENOMEM; | |
0d7dbfce | 5848 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
5849 | dout("rbd id object name is %s\n", object_name); |
5850 | ||
5851 | /* Response will be an encoded string, which includes a length */ | |
5852 | ||
5853 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5854 | response = kzalloc(size, GFP_NOIO); | |
5855 | if (!response) { | |
5856 | ret = -ENOMEM; | |
5857 | goto out; | |
5858 | } | |
5859 | ||
c0fba368 AE |
5860 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5861 | ||
36be9a76 | 5862 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 5863 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 5864 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 5865 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5866 | if (ret == -ENOENT) { |
5867 | image_id = kstrdup("", GFP_KERNEL); | |
5868 | ret = image_id ? 0 : -ENOMEM; | |
5869 | if (!ret) | |
5870 | rbd_dev->image_format = 1; | |
7dd440c9 | 5871 | } else if (ret >= 0) { |
c0fba368 AE |
5872 | void *p = response; |
5873 | ||
5874 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5875 | NULL, GFP_NOIO); |
461f758a | 5876 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5877 | if (!ret) |
5878 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5879 | } |
5880 | ||
5881 | if (!ret) { | |
5882 | rbd_dev->spec->image_id = image_id; | |
5883 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5884 | } |
5885 | out: | |
5886 | kfree(response); | |
5887 | kfree(object_name); | |
5888 | ||
5889 | return ret; | |
5890 | } | |
5891 | ||
3abef3b3 AE |
5892 | /* |
5893 | * Undo whatever state changes are made by v1 or v2 header info | |
5894 | * call. | |
5895 | */ | |
6fd48b3b AE |
5896 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5897 | { | |
5898 | struct rbd_image_header *header; | |
5899 | ||
e69b8d41 | 5900 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5901 | |
5902 | /* Free dynamic fields from the header, then zero it out */ | |
5903 | ||
5904 | header = &rbd_dev->header; | |
812164f8 | 5905 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5906 | kfree(header->snap_sizes); |
5907 | kfree(header->snap_names); | |
5908 | kfree(header->object_prefix); | |
5909 | memset(header, 0, sizeof (*header)); | |
5910 | } | |
5911 | ||
2df3fac7 | 5912 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5913 | { |
5914 | int ret; | |
a30b71b9 | 5915 | |
1e130199 | 5916 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5917 | if (ret) |
b1b5402a AE |
5918 | goto out_err; |
5919 | ||
2df3fac7 AE |
5920 | /* |
5921 | * Get the and check features for the image. Currently the | |
5922 | * features are assumed to never change. | |
5923 | */ | |
b1b5402a | 5924 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5925 | if (ret) |
9d475de5 | 5926 | goto out_err; |
35d489f9 | 5927 | |
cc070d59 AE |
5928 | /* If the image supports fancy striping, get its parameters */ |
5929 | ||
5930 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5931 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5932 | if (ret < 0) | |
5933 | goto out_err; | |
5934 | } | |
2df3fac7 | 5935 | /* No support for crypto and compression type format 2 images */ |
a30b71b9 | 5936 | |
35152979 | 5937 | return 0; |
9d475de5 | 5938 | out_err: |
642a2537 | 5939 | rbd_dev->header.features = 0; |
1e130199 AE |
5940 | kfree(rbd_dev->header.object_prefix); |
5941 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
5942 | |
5943 | return ret; | |
a30b71b9 AE |
5944 | } |
5945 | ||
6d69bb53 ID |
5946 | /* |
5947 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5948 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5949 | * length of the already discovered part of the parent chain. | |
5950 | */ | |
5951 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5952 | { |
2f82ee54 | 5953 | struct rbd_device *parent = NULL; |
124afba2 AE |
5954 | int ret; |
5955 | ||
5956 | if (!rbd_dev->parent_spec) | |
5957 | return 0; | |
124afba2 | 5958 | |
6d69bb53 ID |
5959 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5960 | pr_info("parent chain is too long (%d)\n", depth); | |
5961 | ret = -EINVAL; | |
5962 | goto out_err; | |
5963 | } | |
5964 | ||
1643dfa4 | 5965 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5966 | if (!parent) { |
5967 | ret = -ENOMEM; | |
124afba2 | 5968 | goto out_err; |
1f2c6651 ID |
5969 | } |
5970 | ||
5971 | /* | |
5972 | * Images related by parent/child relationships always share | |
5973 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5974 | */ | |
5975 | __rbd_get_client(rbd_dev->rbd_client); | |
5976 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5977 | |
6d69bb53 | 5978 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5979 | if (ret < 0) |
5980 | goto out_err; | |
1f2c6651 | 5981 | |
124afba2 | 5982 | rbd_dev->parent = parent; |
a2acd00e | 5983 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5984 | return 0; |
1f2c6651 | 5985 | |
124afba2 | 5986 | out_err: |
1f2c6651 | 5987 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5988 | rbd_dev_destroy(parent); |
124afba2 AE |
5989 | return ret; |
5990 | } | |
5991 | ||
811c6688 ID |
5992 | /* |
5993 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5994 | * upon return. | |
5995 | */ | |
200a6a8b | 5996 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5997 | { |
83a06263 | 5998 | int ret; |
d1cf5788 | 5999 | |
9b60e70b | 6000 | /* Record our major and minor device numbers. */ |
83a06263 | 6001 | |
9b60e70b ID |
6002 | if (!single_major) { |
6003 | ret = register_blkdev(0, rbd_dev->name); | |
6004 | if (ret < 0) | |
1643dfa4 | 6005 | goto err_out_unlock; |
9b60e70b ID |
6006 | |
6007 | rbd_dev->major = ret; | |
6008 | rbd_dev->minor = 0; | |
6009 | } else { | |
6010 | rbd_dev->major = rbd_major; | |
6011 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
6012 | } | |
83a06263 AE |
6013 | |
6014 | /* Set up the blkdev mapping. */ | |
6015 | ||
6016 | ret = rbd_init_disk(rbd_dev); | |
6017 | if (ret) | |
6018 | goto err_out_blkdev; | |
6019 | ||
f35a4dee | 6020 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
6021 | if (ret) |
6022 | goto err_out_disk; | |
bc1ecc65 | 6023 | |
f35a4dee | 6024 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
22001f61 | 6025 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
f35a4dee | 6026 | |
dd5ac32d ID |
6027 | dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
6028 | ret = device_add(&rbd_dev->dev); | |
f35a4dee | 6029 | if (ret) |
f5ee37bd | 6030 | goto err_out_mapping; |
83a06263 | 6031 | |
83a06263 AE |
6032 | /* Everything's ready. Announce the disk to the world. */ |
6033 | ||
129b79d4 | 6034 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 6035 | up_write(&rbd_dev->header_rwsem); |
83a06263 | 6036 | |
1643dfa4 ID |
6037 | spin_lock(&rbd_dev_list_lock); |
6038 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
6039 | spin_unlock(&rbd_dev_list_lock); | |
6040 | ||
811c6688 | 6041 | add_disk(rbd_dev->disk); |
ca7909e8 ID |
6042 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, |
6043 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
6044 | rbd_dev->header.features); | |
83a06263 AE |
6045 | |
6046 | return ret; | |
2f82ee54 | 6047 | |
f35a4dee AE |
6048 | err_out_mapping: |
6049 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
6050 | err_out_disk: |
6051 | rbd_free_disk(rbd_dev); | |
6052 | err_out_blkdev: | |
9b60e70b ID |
6053 | if (!single_major) |
6054 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
6055 | err_out_unlock: |
6056 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
6057 | return ret; |
6058 | } | |
6059 | ||
332bb12d AE |
6060 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
6061 | { | |
6062 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 6063 | int ret; |
332bb12d AE |
6064 | |
6065 | /* Record the header object name for this rbd image. */ | |
6066 | ||
6067 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
6068 | ||
7627151e | 6069 | rbd_dev->header_oloc.pool = rbd_dev->layout.pool_id; |
332bb12d | 6070 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
6071 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
6072 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 6073 | else |
c41d13a3 ID |
6074 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
6075 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 6076 | |
c41d13a3 | 6077 | return ret; |
332bb12d AE |
6078 | } |
6079 | ||
200a6a8b AE |
6080 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
6081 | { | |
6fd48b3b | 6082 | rbd_dev_unprobe(rbd_dev); |
6fd48b3b AE |
6083 | rbd_dev->image_format = 0; |
6084 | kfree(rbd_dev->spec->image_id); | |
6085 | rbd_dev->spec->image_id = NULL; | |
6086 | ||
200a6a8b AE |
6087 | rbd_dev_destroy(rbd_dev); |
6088 | } | |
6089 | ||
a30b71b9 AE |
6090 | /* |
6091 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
6092 | * device. If this image is the one being mapped (i.e., not a |
6093 | * parent), initiate a watch on its header object before using that | |
6094 | * object to get detailed information about the rbd image. | |
a30b71b9 | 6095 | */ |
6d69bb53 | 6096 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
6097 | { |
6098 | int ret; | |
6099 | ||
6100 | /* | |
3abef3b3 AE |
6101 | * Get the id from the image id object. Unless there's an |
6102 | * error, rbd_dev->spec->image_id will be filled in with | |
6103 | * a dynamically-allocated string, and rbd_dev->image_format | |
6104 | * will be set to either 1 or 2. | |
a30b71b9 AE |
6105 | */ |
6106 | ret = rbd_dev_image_id(rbd_dev); | |
6107 | if (ret) | |
c0fba368 | 6108 | return ret; |
c0fba368 | 6109 | |
332bb12d AE |
6110 | ret = rbd_dev_header_name(rbd_dev); |
6111 | if (ret) | |
6112 | goto err_out_format; | |
6113 | ||
6d69bb53 | 6114 | if (!depth) { |
99d16943 | 6115 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
6116 | if (ret) { |
6117 | if (ret == -ENOENT) | |
6118 | pr_info("image %s/%s does not exist\n", | |
6119 | rbd_dev->spec->pool_name, | |
6120 | rbd_dev->spec->image_name); | |
c41d13a3 | 6121 | goto err_out_format; |
1fe48023 | 6122 | } |
1f3ef788 | 6123 | } |
b644de2b | 6124 | |
a720ae09 | 6125 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 6126 | if (ret) |
b644de2b | 6127 | goto err_out_watch; |
83a06263 | 6128 | |
04077599 ID |
6129 | /* |
6130 | * If this image is the one being mapped, we have pool name and | |
6131 | * id, image name and id, and snap name - need to fill snap id. | |
6132 | * Otherwise this is a parent image, identified by pool, image | |
6133 | * and snap ids - need to fill in names for those ids. | |
6134 | */ | |
6d69bb53 | 6135 | if (!depth) |
04077599 ID |
6136 | ret = rbd_spec_fill_snap_id(rbd_dev); |
6137 | else | |
6138 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
6139 | if (ret) { |
6140 | if (ret == -ENOENT) | |
6141 | pr_info("snap %s/%s@%s does not exist\n", | |
6142 | rbd_dev->spec->pool_name, | |
6143 | rbd_dev->spec->image_name, | |
6144 | rbd_dev->spec->snap_name); | |
33dca39f | 6145 | goto err_out_probe; |
1fe48023 | 6146 | } |
9bb81c9b | 6147 | |
e8f59b59 ID |
6148 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
6149 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
6150 | if (ret) | |
6151 | goto err_out_probe; | |
6152 | ||
6153 | /* | |
6154 | * Need to warn users if this image is the one being | |
6155 | * mapped and has a parent. | |
6156 | */ | |
6d69bb53 | 6157 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
6158 | rbd_warn(rbd_dev, |
6159 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
6160 | } | |
6161 | ||
6d69bb53 | 6162 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
6163 | if (ret) |
6164 | goto err_out_probe; | |
6165 | ||
6166 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 6167 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 6168 | return 0; |
e8f59b59 | 6169 | |
6fd48b3b AE |
6170 | err_out_probe: |
6171 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 6172 | err_out_watch: |
6d69bb53 | 6173 | if (!depth) |
99d16943 | 6174 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
6175 | err_out_format: |
6176 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
6177 | kfree(rbd_dev->spec->image_id); |
6178 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
6179 | return ret; |
6180 | } | |
6181 | ||
9b60e70b ID |
6182 | static ssize_t do_rbd_add(struct bus_type *bus, |
6183 | const char *buf, | |
6184 | size_t count) | |
602adf40 | 6185 | { |
cb8627c7 | 6186 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 6187 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 6188 | struct rbd_options *rbd_opts = NULL; |
859c31df | 6189 | struct rbd_spec *spec = NULL; |
9d3997fd | 6190 | struct rbd_client *rbdc; |
51344a38 | 6191 | bool read_only; |
b51c83c2 | 6192 | int rc; |
602adf40 YS |
6193 | |
6194 | if (!try_module_get(THIS_MODULE)) | |
6195 | return -ENODEV; | |
6196 | ||
602adf40 | 6197 | /* parse add command */ |
859c31df | 6198 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 6199 | if (rc < 0) |
dd5ac32d | 6200 | goto out; |
78cea76e | 6201 | |
9d3997fd AE |
6202 | rbdc = rbd_get_client(ceph_opts); |
6203 | if (IS_ERR(rbdc)) { | |
6204 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 6205 | goto err_out_args; |
9d3997fd | 6206 | } |
602adf40 | 6207 | |
602adf40 | 6208 | /* pick the pool */ |
30ba1f02 | 6209 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
1fe48023 ID |
6210 | if (rc < 0) { |
6211 | if (rc == -ENOENT) | |
6212 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 6213 | goto err_out_client; |
1fe48023 | 6214 | } |
c0cd10db | 6215 | spec->pool_id = (u64)rc; |
859c31df | 6216 | |
d147543d | 6217 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
6218 | if (!rbd_dev) { |
6219 | rc = -ENOMEM; | |
bd4ba655 | 6220 | goto err_out_client; |
b51c83c2 | 6221 | } |
c53d5893 AE |
6222 | rbdc = NULL; /* rbd_dev now owns this */ |
6223 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 6224 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 6225 | |
811c6688 | 6226 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 6227 | rc = rbd_dev_image_probe(rbd_dev, 0); |
a30b71b9 | 6228 | if (rc < 0) |
c53d5893 | 6229 | goto err_out_rbd_dev; |
05fd6f6f | 6230 | |
7ce4eef7 AE |
6231 | /* If we are mapping a snapshot it must be marked read-only */ |
6232 | ||
d147543d | 6233 | read_only = rbd_dev->opts->read_only; |
7ce4eef7 AE |
6234 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
6235 | read_only = true; | |
6236 | rbd_dev->mapping.read_only = read_only; | |
6237 | ||
b536f69a | 6238 | rc = rbd_dev_device_setup(rbd_dev); |
3abef3b3 | 6239 | if (rc) { |
e37180c0 | 6240 | /* |
99d16943 | 6241 | * rbd_unregister_watch() can't be moved into |
e37180c0 ID |
6242 | * rbd_dev_image_release() without refactoring, see |
6243 | * commit 1f3ef78861ac. | |
6244 | */ | |
99d16943 | 6245 | rbd_unregister_watch(rbd_dev); |
3abef3b3 | 6246 | rbd_dev_image_release(rbd_dev); |
dd5ac32d | 6247 | goto out; |
3abef3b3 AE |
6248 | } |
6249 | ||
dd5ac32d ID |
6250 | rc = count; |
6251 | out: | |
6252 | module_put(THIS_MODULE); | |
6253 | return rc; | |
b536f69a | 6254 | |
c53d5893 | 6255 | err_out_rbd_dev: |
811c6688 | 6256 | up_write(&rbd_dev->header_rwsem); |
c53d5893 | 6257 | rbd_dev_destroy(rbd_dev); |
bd4ba655 | 6258 | err_out_client: |
9d3997fd | 6259 | rbd_put_client(rbdc); |
0ddebc0c | 6260 | err_out_args: |
859c31df | 6261 | rbd_spec_put(spec); |
d147543d | 6262 | kfree(rbd_opts); |
dd5ac32d | 6263 | goto out; |
602adf40 YS |
6264 | } |
6265 | ||
9b60e70b ID |
6266 | static ssize_t rbd_add(struct bus_type *bus, |
6267 | const char *buf, | |
6268 | size_t count) | |
6269 | { | |
6270 | if (single_major) | |
6271 | return -EINVAL; | |
6272 | ||
6273 | return do_rbd_add(bus, buf, count); | |
6274 | } | |
6275 | ||
6276 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
6277 | const char *buf, | |
6278 | size_t count) | |
6279 | { | |
6280 | return do_rbd_add(bus, buf, count); | |
6281 | } | |
6282 | ||
dd5ac32d | 6283 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
602adf40 | 6284 | { |
602adf40 | 6285 | rbd_free_disk(rbd_dev); |
1643dfa4 ID |
6286 | |
6287 | spin_lock(&rbd_dev_list_lock); | |
6288 | list_del_init(&rbd_dev->node); | |
6289 | spin_unlock(&rbd_dev_list_lock); | |
6290 | ||
200a6a8b | 6291 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
dd5ac32d | 6292 | device_del(&rbd_dev->dev); |
6d80b130 | 6293 | rbd_dev_mapping_clear(rbd_dev); |
9b60e70b ID |
6294 | if (!single_major) |
6295 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
602adf40 YS |
6296 | } |
6297 | ||
05a46afd AE |
6298 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
6299 | { | |
ad945fc1 | 6300 | while (rbd_dev->parent) { |
05a46afd AE |
6301 | struct rbd_device *first = rbd_dev; |
6302 | struct rbd_device *second = first->parent; | |
6303 | struct rbd_device *third; | |
6304 | ||
6305 | /* | |
6306 | * Follow to the parent with no grandparent and | |
6307 | * remove it. | |
6308 | */ | |
6309 | while (second && (third = second->parent)) { | |
6310 | first = second; | |
6311 | second = third; | |
6312 | } | |
ad945fc1 | 6313 | rbd_assert(second); |
8ad42cd0 | 6314 | rbd_dev_image_release(second); |
ad945fc1 AE |
6315 | first->parent = NULL; |
6316 | first->parent_overlap = 0; | |
6317 | ||
6318 | rbd_assert(first->parent_spec); | |
05a46afd AE |
6319 | rbd_spec_put(first->parent_spec); |
6320 | first->parent_spec = NULL; | |
05a46afd AE |
6321 | } |
6322 | } | |
6323 | ||
9b60e70b ID |
6324 | static ssize_t do_rbd_remove(struct bus_type *bus, |
6325 | const char *buf, | |
6326 | size_t count) | |
602adf40 YS |
6327 | { |
6328 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
6329 | struct list_head *tmp; |
6330 | int dev_id; | |
602adf40 | 6331 | unsigned long ul; |
82a442d2 | 6332 | bool already = false; |
0d8189e1 | 6333 | int ret; |
602adf40 | 6334 | |
bb8e0e84 | 6335 | ret = kstrtoul(buf, 10, &ul); |
0d8189e1 AE |
6336 | if (ret) |
6337 | return ret; | |
602adf40 YS |
6338 | |
6339 | /* convert to int; abort if we lost anything in the conversion */ | |
751cc0e3 AE |
6340 | dev_id = (int)ul; |
6341 | if (dev_id != ul) | |
602adf40 YS |
6342 | return -EINVAL; |
6343 | ||
751cc0e3 AE |
6344 | ret = -ENOENT; |
6345 | spin_lock(&rbd_dev_list_lock); | |
6346 | list_for_each(tmp, &rbd_dev_list) { | |
6347 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
6348 | if (rbd_dev->dev_id == dev_id) { | |
6349 | ret = 0; | |
6350 | break; | |
6351 | } | |
42382b70 | 6352 | } |
751cc0e3 AE |
6353 | if (!ret) { |
6354 | spin_lock_irq(&rbd_dev->lock); | |
6355 | if (rbd_dev->open_count) | |
6356 | ret = -EBUSY; | |
6357 | else | |
82a442d2 AE |
6358 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
6359 | &rbd_dev->flags); | |
751cc0e3 AE |
6360 | spin_unlock_irq(&rbd_dev->lock); |
6361 | } | |
6362 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 6363 | if (ret < 0 || already) |
1ba0f1e7 | 6364 | return ret; |
751cc0e3 | 6365 | |
ed95b21a ID |
6366 | down_write(&rbd_dev->lock_rwsem); |
6367 | if (__rbd_is_lock_owner(rbd_dev)) | |
6368 | rbd_unlock(rbd_dev); | |
6369 | up_write(&rbd_dev->lock_rwsem); | |
99d16943 | 6370 | rbd_unregister_watch(rbd_dev); |
fca27065 | 6371 | |
9875201e JD |
6372 | /* |
6373 | * Don't free anything from rbd_dev->disk until after all | |
6374 | * notifies are completely processed. Otherwise | |
6375 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting | |
6376 | * in a potential use after free of rbd_dev->disk or rbd_dev. | |
6377 | */ | |
dd5ac32d | 6378 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 6379 | rbd_dev_image_release(rbd_dev); |
aafb230e | 6380 | |
1ba0f1e7 | 6381 | return count; |
602adf40 YS |
6382 | } |
6383 | ||
9b60e70b ID |
6384 | static ssize_t rbd_remove(struct bus_type *bus, |
6385 | const char *buf, | |
6386 | size_t count) | |
6387 | { | |
6388 | if (single_major) | |
6389 | return -EINVAL; | |
6390 | ||
6391 | return do_rbd_remove(bus, buf, count); | |
6392 | } | |
6393 | ||
6394 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
6395 | const char *buf, | |
6396 | size_t count) | |
6397 | { | |
6398 | return do_rbd_remove(bus, buf, count); | |
6399 | } | |
6400 | ||
602adf40 YS |
6401 | /* |
6402 | * create control files in sysfs | |
dfc5606d | 6403 | * /sys/bus/rbd/... |
602adf40 YS |
6404 | */ |
6405 | static int rbd_sysfs_init(void) | |
6406 | { | |
dfc5606d | 6407 | int ret; |
602adf40 | 6408 | |
fed4c143 | 6409 | ret = device_register(&rbd_root_dev); |
21079786 | 6410 | if (ret < 0) |
dfc5606d | 6411 | return ret; |
602adf40 | 6412 | |
fed4c143 AE |
6413 | ret = bus_register(&rbd_bus_type); |
6414 | if (ret < 0) | |
6415 | device_unregister(&rbd_root_dev); | |
602adf40 | 6416 | |
602adf40 YS |
6417 | return ret; |
6418 | } | |
6419 | ||
6420 | static void rbd_sysfs_cleanup(void) | |
6421 | { | |
dfc5606d | 6422 | bus_unregister(&rbd_bus_type); |
fed4c143 | 6423 | device_unregister(&rbd_root_dev); |
602adf40 YS |
6424 | } |
6425 | ||
1c2a9dfe AE |
6426 | static int rbd_slab_init(void) |
6427 | { | |
6428 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 6429 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
6430 | if (!rbd_img_request_cache) |
6431 | return -ENOMEM; | |
6432 | ||
6433 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 6434 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
6435 | if (!rbd_obj_request_cache) |
6436 | goto out_err; | |
6437 | ||
6438 | rbd_assert(!rbd_segment_name_cache); | |
6439 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
2d0ebc5d | 6440 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
78c2a44a | 6441 | if (rbd_segment_name_cache) |
1c2a9dfe | 6442 | return 0; |
78c2a44a | 6443 | out_err: |
13bf2834 JL |
6444 | kmem_cache_destroy(rbd_obj_request_cache); |
6445 | rbd_obj_request_cache = NULL; | |
1c2a9dfe | 6446 | |
868311b1 AE |
6447 | kmem_cache_destroy(rbd_img_request_cache); |
6448 | rbd_img_request_cache = NULL; | |
6449 | ||
1c2a9dfe AE |
6450 | return -ENOMEM; |
6451 | } | |
6452 | ||
6453 | static void rbd_slab_exit(void) | |
6454 | { | |
78c2a44a AE |
6455 | rbd_assert(rbd_segment_name_cache); |
6456 | kmem_cache_destroy(rbd_segment_name_cache); | |
6457 | rbd_segment_name_cache = NULL; | |
6458 | ||
868311b1 AE |
6459 | rbd_assert(rbd_obj_request_cache); |
6460 | kmem_cache_destroy(rbd_obj_request_cache); | |
6461 | rbd_obj_request_cache = NULL; | |
6462 | ||
1c2a9dfe AE |
6463 | rbd_assert(rbd_img_request_cache); |
6464 | kmem_cache_destroy(rbd_img_request_cache); | |
6465 | rbd_img_request_cache = NULL; | |
6466 | } | |
6467 | ||
cc344fa1 | 6468 | static int __init rbd_init(void) |
602adf40 YS |
6469 | { |
6470 | int rc; | |
6471 | ||
1e32d34c AE |
6472 | if (!libceph_compatible(NULL)) { |
6473 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
6474 | return -EINVAL; |
6475 | } | |
e1b4d96d | 6476 | |
1c2a9dfe | 6477 | rc = rbd_slab_init(); |
602adf40 YS |
6478 | if (rc) |
6479 | return rc; | |
e1b4d96d | 6480 | |
f5ee37bd ID |
6481 | /* |
6482 | * The number of active work items is limited by the number of | |
f77303bd | 6483 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
6484 | */ |
6485 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
6486 | if (!rbd_wq) { | |
6487 | rc = -ENOMEM; | |
6488 | goto err_out_slab; | |
6489 | } | |
6490 | ||
9b60e70b ID |
6491 | if (single_major) { |
6492 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
6493 | if (rbd_major < 0) { | |
6494 | rc = rbd_major; | |
f5ee37bd | 6495 | goto err_out_wq; |
9b60e70b ID |
6496 | } |
6497 | } | |
6498 | ||
1c2a9dfe AE |
6499 | rc = rbd_sysfs_init(); |
6500 | if (rc) | |
9b60e70b ID |
6501 | goto err_out_blkdev; |
6502 | ||
6503 | if (single_major) | |
6504 | pr_info("loaded (major %d)\n", rbd_major); | |
6505 | else | |
6506 | pr_info("loaded\n"); | |
1c2a9dfe | 6507 | |
e1b4d96d ID |
6508 | return 0; |
6509 | ||
9b60e70b ID |
6510 | err_out_blkdev: |
6511 | if (single_major) | |
6512 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
6513 | err_out_wq: |
6514 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
6515 | err_out_slab: |
6516 | rbd_slab_exit(); | |
1c2a9dfe | 6517 | return rc; |
602adf40 YS |
6518 | } |
6519 | ||
cc344fa1 | 6520 | static void __exit rbd_exit(void) |
602adf40 | 6521 | { |
ffe312cf | 6522 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6523 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6524 | if (single_major) |
6525 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6526 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6527 | rbd_slab_exit(); |
602adf40 YS |
6528 | } |
6529 | ||
6530 | module_init(rbd_init); | |
6531 | module_exit(rbd_exit); | |
6532 | ||
d552c619 | 6533 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6534 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6535 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6536 | /* following authorship retained from original osdblk.c */ |
6537 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6538 | ||
90da258b | 6539 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6540 | MODULE_LICENSE("GPL"); |