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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
ed95b21a | 34 | #include <linux/ceph/cls_lock_client.h> |
43df3d35 | 35 | #include <linux/ceph/striper.h> |
602adf40 | 36 | #include <linux/ceph/decode.h> |
59c2be1e | 37 | #include <linux/parser.h> |
30d1cff8 | 38 | #include <linux/bsearch.h> |
602adf40 YS |
39 | |
40 | #include <linux/kernel.h> | |
41 | #include <linux/device.h> | |
42 | #include <linux/module.h> | |
7ad18afa | 43 | #include <linux/blk-mq.h> |
602adf40 YS |
44 | #include <linux/fs.h> |
45 | #include <linux/blkdev.h> | |
1c2a9dfe | 46 | #include <linux/slab.h> |
f8a22fc2 | 47 | #include <linux/idr.h> |
bc1ecc65 | 48 | #include <linux/workqueue.h> |
602adf40 YS |
49 | |
50 | #include "rbd_types.h" | |
51 | ||
aafb230e AE |
52 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
53 | ||
a2acd00e AE |
54 | /* |
55 | * Increment the given counter and return its updated value. | |
56 | * If the counter is already 0 it will not be incremented. | |
57 | * If the counter is already at its maximum value returns | |
58 | * -EINVAL without updating it. | |
59 | */ | |
60 | static int atomic_inc_return_safe(atomic_t *v) | |
61 | { | |
62 | unsigned int counter; | |
63 | ||
bfc18e38 | 64 | counter = (unsigned int)atomic_fetch_add_unless(v, 1, 0); |
a2acd00e AE |
65 | if (counter <= (unsigned int)INT_MAX) |
66 | return (int)counter; | |
67 | ||
68 | atomic_dec(v); | |
69 | ||
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
74 | static int atomic_dec_return_safe(atomic_t *v) | |
75 | { | |
76 | int counter; | |
77 | ||
78 | counter = atomic_dec_return(v); | |
79 | if (counter >= 0) | |
80 | return counter; | |
81 | ||
82 | atomic_inc(v); | |
83 | ||
84 | return -EINVAL; | |
85 | } | |
86 | ||
f0f8cef5 | 87 | #define RBD_DRV_NAME "rbd" |
602adf40 | 88 | |
7e513d43 ID |
89 | #define RBD_MINORS_PER_MAJOR 256 |
90 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 91 | |
6d69bb53 ID |
92 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
93 | ||
d4b125e9 AE |
94 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
95 | #define RBD_MAX_SNAP_NAME_LEN \ | |
96 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
97 | ||
35d489f9 | 98 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
99 | |
100 | #define RBD_SNAP_HEAD_NAME "-" | |
101 | ||
9682fc6d AE |
102 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
103 | ||
9e15b77d AE |
104 | /* This allows a single page to hold an image name sent by OSD */ |
105 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 106 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 107 | |
1e130199 | 108 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 109 | |
ed95b21a | 110 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
99d16943 ID |
111 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
112 | ||
d889140c AE |
113 | /* Feature bits */ |
114 | ||
8767b293 ID |
115 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
116 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) | |
117 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) | |
118 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) | |
e573427a | 119 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
8767b293 | 120 | |
ed95b21a ID |
121 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
122 | RBD_FEATURE_STRIPINGV2 | \ | |
7e97332e | 123 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
e573427a ID |
124 | RBD_FEATURE_DATA_POOL | \ |
125 | RBD_FEATURE_OPERATIONS) | |
d889140c AE |
126 | |
127 | /* Features supported by this (client software) implementation. */ | |
128 | ||
770eba6e | 129 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 130 | |
81a89793 AE |
131 | /* |
132 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
133 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 134 | */ |
602adf40 YS |
135 | #define DEV_NAME_LEN 32 |
136 | ||
137 | /* | |
138 | * block device image metadata (in-memory version) | |
139 | */ | |
140 | struct rbd_image_header { | |
f35a4dee | 141 | /* These six fields never change for a given rbd image */ |
849b4260 | 142 | char *object_prefix; |
602adf40 | 143 | __u8 obj_order; |
f35a4dee AE |
144 | u64 stripe_unit; |
145 | u64 stripe_count; | |
7e97332e | 146 | s64 data_pool_id; |
f35a4dee | 147 | u64 features; /* Might be changeable someday? */ |
602adf40 | 148 | |
f84344f3 AE |
149 | /* The remaining fields need to be updated occasionally */ |
150 | u64 image_size; | |
151 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
152 | char *snap_names; /* format 1 only */ |
153 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
154 | }; |
155 | ||
0d7dbfce AE |
156 | /* |
157 | * An rbd image specification. | |
158 | * | |
159 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
160 | * identify an image. Each rbd_dev structure includes a pointer to |
161 | * an rbd_spec structure that encapsulates this identity. | |
162 | * | |
163 | * Each of the id's in an rbd_spec has an associated name. For a | |
164 | * user-mapped image, the names are supplied and the id's associated | |
165 | * with them are looked up. For a layered image, a parent image is | |
166 | * defined by the tuple, and the names are looked up. | |
167 | * | |
168 | * An rbd_dev structure contains a parent_spec pointer which is | |
169 | * non-null if the image it represents is a child in a layered | |
170 | * image. This pointer will refer to the rbd_spec structure used | |
171 | * by the parent rbd_dev for its own identity (i.e., the structure | |
172 | * is shared between the parent and child). | |
173 | * | |
174 | * Since these structures are populated once, during the discovery | |
175 | * phase of image construction, they are effectively immutable so | |
176 | * we make no effort to synchronize access to them. | |
177 | * | |
178 | * Note that code herein does not assume the image name is known (it | |
179 | * could be a null pointer). | |
0d7dbfce AE |
180 | */ |
181 | struct rbd_spec { | |
182 | u64 pool_id; | |
ecb4dc22 | 183 | const char *pool_name; |
b26c047b | 184 | const char *pool_ns; /* NULL if default, never "" */ |
0d7dbfce | 185 | |
ecb4dc22 AE |
186 | const char *image_id; |
187 | const char *image_name; | |
0d7dbfce AE |
188 | |
189 | u64 snap_id; | |
ecb4dc22 | 190 | const char *snap_name; |
0d7dbfce AE |
191 | |
192 | struct kref kref; | |
193 | }; | |
194 | ||
602adf40 | 195 | /* |
f0f8cef5 | 196 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
197 | */ |
198 | struct rbd_client { | |
199 | struct ceph_client *client; | |
200 | struct kref kref; | |
201 | struct list_head node; | |
202 | }; | |
203 | ||
bf0d5f50 | 204 | struct rbd_img_request; |
bf0d5f50 | 205 | |
9969ebc5 | 206 | enum obj_request_type { |
a1fbb5e7 | 207 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 208 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 209 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
afb97888 | 210 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
9969ebc5 | 211 | }; |
bf0d5f50 | 212 | |
6d2940c8 | 213 | enum obj_operation_type { |
a1fbb5e7 | 214 | OBJ_OP_READ = 1, |
6d2940c8 | 215 | OBJ_OP_WRITE, |
90e98c52 | 216 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
217 | }; |
218 | ||
3da691bf ID |
219 | /* |
220 | * Writes go through the following state machine to deal with | |
221 | * layering: | |
222 | * | |
223 | * need copyup | |
224 | * RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP | |
225 | * | ^ | | |
226 | * v \------------------------------/ | |
227 | * done | |
228 | * ^ | |
229 | * | | |
230 | * RBD_OBJ_WRITE_FLAT | |
231 | * | |
232 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
233 | * there is a parent or not. | |
234 | */ | |
235 | enum rbd_obj_write_state { | |
236 | RBD_OBJ_WRITE_FLAT = 1, | |
237 | RBD_OBJ_WRITE_GUARD, | |
238 | RBD_OBJ_WRITE_COPYUP, | |
926f9b3f AE |
239 | }; |
240 | ||
bf0d5f50 | 241 | struct rbd_obj_request { |
43df3d35 | 242 | struct ceph_object_extent ex; |
c5b5ef6c | 243 | union { |
3da691bf ID |
244 | bool tried_parent; /* for reads */ |
245 | enum rbd_obj_write_state write_state; /* for writes */ | |
c5b5ef6c | 246 | }; |
bf0d5f50 | 247 | |
51c3509e | 248 | struct rbd_img_request *img_request; |
86bd7998 ID |
249 | struct ceph_file_extent *img_extents; |
250 | u32 num_img_extents; | |
bf0d5f50 | 251 | |
788e2df3 | 252 | union { |
5359a17d | 253 | struct ceph_bio_iter bio_pos; |
788e2df3 | 254 | struct { |
7e07efb1 ID |
255 | struct ceph_bvec_iter bvec_pos; |
256 | u32 bvec_count; | |
afb97888 | 257 | u32 bvec_idx; |
788e2df3 AE |
258 | }; |
259 | }; | |
7e07efb1 ID |
260 | struct bio_vec *copyup_bvecs; |
261 | u32 copyup_bvec_count; | |
bf0d5f50 AE |
262 | |
263 | struct ceph_osd_request *osd_req; | |
264 | ||
265 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 266 | int result; |
bf0d5f50 | 267 | |
bf0d5f50 AE |
268 | struct kref kref; |
269 | }; | |
270 | ||
0c425248 | 271 | enum img_req_flags { |
9849e986 | 272 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 273 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
274 | }; |
275 | ||
bf0d5f50 | 276 | struct rbd_img_request { |
bf0d5f50 | 277 | struct rbd_device *rbd_dev; |
9bb0248d | 278 | enum obj_operation_type op_type; |
ecc633ca | 279 | enum obj_request_type data_type; |
0c425248 | 280 | unsigned long flags; |
bf0d5f50 | 281 | union { |
9849e986 | 282 | u64 snap_id; /* for reads */ |
bf0d5f50 | 283 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
284 | }; |
285 | union { | |
286 | struct request *rq; /* block request */ | |
287 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 288 | }; |
15961b44 | 289 | spinlock_t completion_lock; |
55f27e09 | 290 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 291 | int result; /* first nonzero obj_request result */ |
bf0d5f50 | 292 | |
43df3d35 | 293 | struct list_head object_extents; /* obj_req.ex structs */ |
bf0d5f50 | 294 | u32 obj_request_count; |
7114edac | 295 | u32 pending_count; |
bf0d5f50 AE |
296 | |
297 | struct kref kref; | |
298 | }; | |
299 | ||
300 | #define for_each_obj_request(ireq, oreq) \ | |
43df3d35 | 301 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 302 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
43df3d35 | 303 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 304 | |
99d16943 ID |
305 | enum rbd_watch_state { |
306 | RBD_WATCH_STATE_UNREGISTERED, | |
307 | RBD_WATCH_STATE_REGISTERED, | |
308 | RBD_WATCH_STATE_ERROR, | |
309 | }; | |
310 | ||
ed95b21a ID |
311 | enum rbd_lock_state { |
312 | RBD_LOCK_STATE_UNLOCKED, | |
313 | RBD_LOCK_STATE_LOCKED, | |
314 | RBD_LOCK_STATE_RELEASING, | |
315 | }; | |
316 | ||
317 | /* WatchNotify::ClientId */ | |
318 | struct rbd_client_id { | |
319 | u64 gid; | |
320 | u64 handle; | |
321 | }; | |
322 | ||
f84344f3 | 323 | struct rbd_mapping { |
99c1f08f | 324 | u64 size; |
34b13184 | 325 | u64 features; |
f84344f3 AE |
326 | }; |
327 | ||
602adf40 YS |
328 | /* |
329 | * a single device | |
330 | */ | |
331 | struct rbd_device { | |
de71a297 | 332 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
333 | |
334 | int major; /* blkdev assigned major */ | |
dd82fff1 | 335 | int minor; |
602adf40 | 336 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 337 | |
a30b71b9 | 338 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
339 | struct rbd_client *rbd_client; |
340 | ||
341 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
342 | ||
b82d167b | 343 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
344 | |
345 | struct rbd_image_header header; | |
b82d167b | 346 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 347 | struct rbd_spec *spec; |
d147543d | 348 | struct rbd_options *opts; |
0d6d1e9c | 349 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 350 | |
c41d13a3 | 351 | struct ceph_object_id header_oid; |
922dab61 | 352 | struct ceph_object_locator header_oloc; |
971f839a | 353 | |
1643dfa4 | 354 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 355 | |
99d16943 ID |
356 | struct mutex watch_mutex; |
357 | enum rbd_watch_state watch_state; | |
922dab61 | 358 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
359 | u64 watch_cookie; |
360 | struct delayed_work watch_dwork; | |
59c2be1e | 361 | |
ed95b21a ID |
362 | struct rw_semaphore lock_rwsem; |
363 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 364 | char lock_cookie[32]; |
ed95b21a ID |
365 | struct rbd_client_id owner_cid; |
366 | struct work_struct acquired_lock_work; | |
367 | struct work_struct released_lock_work; | |
368 | struct delayed_work lock_dwork; | |
369 | struct work_struct unlock_work; | |
370 | wait_queue_head_t lock_waitq; | |
371 | ||
1643dfa4 | 372 | struct workqueue_struct *task_wq; |
59c2be1e | 373 | |
86b00e0d AE |
374 | struct rbd_spec *parent_spec; |
375 | u64 parent_overlap; | |
a2acd00e | 376 | atomic_t parent_ref; |
2f82ee54 | 377 | struct rbd_device *parent; |
86b00e0d | 378 | |
7ad18afa CH |
379 | /* Block layer tags. */ |
380 | struct blk_mq_tag_set tag_set; | |
381 | ||
c666601a JD |
382 | /* protects updating the header */ |
383 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
384 | |
385 | struct rbd_mapping mapping; | |
602adf40 YS |
386 | |
387 | struct list_head node; | |
dfc5606d | 388 | |
dfc5606d YS |
389 | /* sysfs related */ |
390 | struct device dev; | |
b82d167b | 391 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
392 | }; |
393 | ||
b82d167b | 394 | /* |
87c0fded ID |
395 | * Flag bits for rbd_dev->flags: |
396 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
397 | * by rbd_dev->lock | |
398 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 399 | */ |
6d292906 AE |
400 | enum rbd_dev_flags { |
401 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 402 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 403 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
404 | }; |
405 | ||
cfbf6377 | 406 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 407 | |
602adf40 | 408 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
409 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
410 | ||
432b8587 AE |
411 | static LIST_HEAD(rbd_client_list); /* clients */ |
412 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 413 | |
78c2a44a AE |
414 | /* Slab caches for frequently-allocated structures */ |
415 | ||
1c2a9dfe | 416 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 417 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 418 | |
9b60e70b | 419 | static int rbd_major; |
f8a22fc2 ID |
420 | static DEFINE_IDA(rbd_dev_id_ida); |
421 | ||
f5ee37bd ID |
422 | static struct workqueue_struct *rbd_wq; |
423 | ||
9b60e70b | 424 | /* |
3cfa3b16 | 425 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 426 | */ |
3cfa3b16 | 427 | static bool single_major = true; |
5657a819 | 428 | module_param(single_major, bool, 0444); |
3cfa3b16 | 429 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 430 | |
f0f8cef5 AE |
431 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
432 | size_t count); | |
433 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
434 | size_t count); | |
9b60e70b ID |
435 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
436 | size_t count); | |
437 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
438 | size_t count); | |
6d69bb53 | 439 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
f0f8cef5 | 440 | |
9b60e70b ID |
441 | static int rbd_dev_id_to_minor(int dev_id) |
442 | { | |
7e513d43 | 443 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
444 | } |
445 | ||
446 | static int minor_to_rbd_dev_id(int minor) | |
447 | { | |
7e513d43 | 448 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
449 | } |
450 | ||
ed95b21a ID |
451 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
452 | { | |
453 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
454 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
455 | } | |
456 | ||
457 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
458 | { | |
459 | bool is_lock_owner; | |
460 | ||
461 | down_read(&rbd_dev->lock_rwsem); | |
462 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
463 | up_read(&rbd_dev->lock_rwsem); | |
464 | return is_lock_owner; | |
465 | } | |
466 | ||
8767b293 ID |
467 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
468 | { | |
469 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
470 | } | |
471 | ||
5657a819 JP |
472 | static BUS_ATTR(add, 0200, NULL, rbd_add); |
473 | static BUS_ATTR(remove, 0200, NULL, rbd_remove); | |
474 | static BUS_ATTR(add_single_major, 0200, NULL, rbd_add_single_major); | |
475 | static BUS_ATTR(remove_single_major, 0200, NULL, rbd_remove_single_major); | |
476 | static BUS_ATTR(supported_features, 0444, rbd_supported_features_show, NULL); | |
b15a21dd GKH |
477 | |
478 | static struct attribute *rbd_bus_attrs[] = { | |
479 | &bus_attr_add.attr, | |
480 | &bus_attr_remove.attr, | |
9b60e70b ID |
481 | &bus_attr_add_single_major.attr, |
482 | &bus_attr_remove_single_major.attr, | |
8767b293 | 483 | &bus_attr_supported_features.attr, |
b15a21dd | 484 | NULL, |
f0f8cef5 | 485 | }; |
92c76dc0 ID |
486 | |
487 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
488 | struct attribute *attr, int index) | |
489 | { | |
9b60e70b ID |
490 | if (!single_major && |
491 | (attr == &bus_attr_add_single_major.attr || | |
492 | attr == &bus_attr_remove_single_major.attr)) | |
493 | return 0; | |
494 | ||
92c76dc0 ID |
495 | return attr->mode; |
496 | } | |
497 | ||
498 | static const struct attribute_group rbd_bus_group = { | |
499 | .attrs = rbd_bus_attrs, | |
500 | .is_visible = rbd_bus_is_visible, | |
501 | }; | |
502 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
503 | |
504 | static struct bus_type rbd_bus_type = { | |
505 | .name = "rbd", | |
b15a21dd | 506 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
507 | }; |
508 | ||
509 | static void rbd_root_dev_release(struct device *dev) | |
510 | { | |
511 | } | |
512 | ||
513 | static struct device rbd_root_dev = { | |
514 | .init_name = "rbd", | |
515 | .release = rbd_root_dev_release, | |
516 | }; | |
517 | ||
06ecc6cb AE |
518 | static __printf(2, 3) |
519 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
520 | { | |
521 | struct va_format vaf; | |
522 | va_list args; | |
523 | ||
524 | va_start(args, fmt); | |
525 | vaf.fmt = fmt; | |
526 | vaf.va = &args; | |
527 | ||
528 | if (!rbd_dev) | |
529 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
530 | else if (rbd_dev->disk) | |
531 | printk(KERN_WARNING "%s: %s: %pV\n", | |
532 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
533 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
534 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
535 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
536 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
537 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
538 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
539 | else /* punt */ | |
540 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
541 | RBD_DRV_NAME, rbd_dev, &vaf); | |
542 | va_end(args); | |
543 | } | |
544 | ||
aafb230e AE |
545 | #ifdef RBD_DEBUG |
546 | #define rbd_assert(expr) \ | |
547 | if (unlikely(!(expr))) { \ | |
548 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
549 | "at line %d:\n\n" \ | |
550 | "\trbd_assert(%s);\n\n", \ | |
551 | __func__, __LINE__, #expr); \ | |
552 | BUG(); \ | |
553 | } | |
554 | #else /* !RBD_DEBUG */ | |
555 | # define rbd_assert(expr) ((void) 0) | |
556 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 557 | |
05a46afd | 558 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 559 | |
cc4a38bd | 560 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 561 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 562 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 563 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
564 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
565 | u64 snap_id); | |
2ad3d716 AE |
566 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
567 | u8 *order, u64 *snap_size); | |
568 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
569 | u64 *snap_features); | |
59c2be1e | 570 | |
602adf40 YS |
571 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
572 | { | |
f0f8cef5 | 573 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 574 | bool removing = false; |
602adf40 | 575 | |
a14ea269 | 576 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
577 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
578 | removing = true; | |
579 | else | |
580 | rbd_dev->open_count++; | |
a14ea269 | 581 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
582 | if (removing) |
583 | return -ENOENT; | |
584 | ||
c3e946ce | 585 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 586 | |
602adf40 YS |
587 | return 0; |
588 | } | |
589 | ||
db2a144b | 590 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
591 | { |
592 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
593 | unsigned long open_count_before; |
594 | ||
a14ea269 | 595 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 596 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 597 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 598 | rbd_assert(open_count_before > 0); |
dfc5606d | 599 | |
c3e946ce | 600 | put_device(&rbd_dev->dev); |
dfc5606d YS |
601 | } |
602 | ||
131fd9f6 GZ |
603 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
604 | { | |
1de797bb | 605 | int ro; |
131fd9f6 | 606 | |
1de797bb | 607 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
608 | return -EFAULT; |
609 | ||
1de797bb | 610 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
611 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
612 | return -EROFS; | |
613 | ||
1de797bb ID |
614 | /* Let blkdev_roset() handle it */ |
615 | return -ENOTTY; | |
131fd9f6 GZ |
616 | } |
617 | ||
618 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
619 | unsigned int cmd, unsigned long arg) | |
620 | { | |
621 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 622 | int ret; |
131fd9f6 | 623 | |
131fd9f6 GZ |
624 | switch (cmd) { |
625 | case BLKROSET: | |
626 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
627 | break; | |
628 | default: | |
629 | ret = -ENOTTY; | |
630 | } | |
631 | ||
131fd9f6 GZ |
632 | return ret; |
633 | } | |
634 | ||
635 | #ifdef CONFIG_COMPAT | |
636 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
637 | unsigned int cmd, unsigned long arg) | |
638 | { | |
639 | return rbd_ioctl(bdev, mode, cmd, arg); | |
640 | } | |
641 | #endif /* CONFIG_COMPAT */ | |
642 | ||
602adf40 YS |
643 | static const struct block_device_operations rbd_bd_ops = { |
644 | .owner = THIS_MODULE, | |
645 | .open = rbd_open, | |
dfc5606d | 646 | .release = rbd_release, |
131fd9f6 GZ |
647 | .ioctl = rbd_ioctl, |
648 | #ifdef CONFIG_COMPAT | |
649 | .compat_ioctl = rbd_compat_ioctl, | |
650 | #endif | |
602adf40 YS |
651 | }; |
652 | ||
653 | /* | |
7262cfca | 654 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 655 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 656 | */ |
f8c38929 | 657 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
658 | { |
659 | struct rbd_client *rbdc; | |
660 | int ret = -ENOMEM; | |
661 | ||
37206ee5 | 662 | dout("%s:\n", __func__); |
602adf40 YS |
663 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
664 | if (!rbdc) | |
665 | goto out_opt; | |
666 | ||
667 | kref_init(&rbdc->kref); | |
668 | INIT_LIST_HEAD(&rbdc->node); | |
669 | ||
74da4a0f | 670 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 671 | if (IS_ERR(rbdc->client)) |
08f75463 | 672 | goto out_rbdc; |
43ae4701 | 673 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
674 | |
675 | ret = ceph_open_session(rbdc->client); | |
676 | if (ret < 0) | |
08f75463 | 677 | goto out_client; |
602adf40 | 678 | |
432b8587 | 679 | spin_lock(&rbd_client_list_lock); |
602adf40 | 680 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 681 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 682 | |
37206ee5 | 683 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 684 | |
602adf40 | 685 | return rbdc; |
08f75463 | 686 | out_client: |
602adf40 | 687 | ceph_destroy_client(rbdc->client); |
08f75463 | 688 | out_rbdc: |
602adf40 YS |
689 | kfree(rbdc); |
690 | out_opt: | |
43ae4701 AE |
691 | if (ceph_opts) |
692 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
693 | dout("%s: error %d\n", __func__, ret); |
694 | ||
28f259b7 | 695 | return ERR_PTR(ret); |
602adf40 YS |
696 | } |
697 | ||
2f82ee54 AE |
698 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
699 | { | |
700 | kref_get(&rbdc->kref); | |
701 | ||
702 | return rbdc; | |
703 | } | |
704 | ||
602adf40 | 705 | /* |
1f7ba331 AE |
706 | * Find a ceph client with specific addr and configuration. If |
707 | * found, bump its reference count. | |
602adf40 | 708 | */ |
1f7ba331 | 709 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
710 | { |
711 | struct rbd_client *client_node; | |
1f7ba331 | 712 | bool found = false; |
602adf40 | 713 | |
43ae4701 | 714 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
715 | return NULL; |
716 | ||
1f7ba331 AE |
717 | spin_lock(&rbd_client_list_lock); |
718 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
719 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
720 | __rbd_get_client(client_node); |
721 | ||
1f7ba331 AE |
722 | found = true; |
723 | break; | |
724 | } | |
725 | } | |
726 | spin_unlock(&rbd_client_list_lock); | |
727 | ||
728 | return found ? client_node : NULL; | |
602adf40 YS |
729 | } |
730 | ||
59c2be1e | 731 | /* |
210c104c | 732 | * (Per device) rbd map options |
59c2be1e YS |
733 | */ |
734 | enum { | |
b5584180 | 735 | Opt_queue_depth, |
34f55d0b | 736 | Opt_lock_timeout, |
59c2be1e YS |
737 | Opt_last_int, |
738 | /* int args above */ | |
b26c047b | 739 | Opt_pool_ns, |
59c2be1e YS |
740 | Opt_last_string, |
741 | /* string args above */ | |
cc0538b6 AE |
742 | Opt_read_only, |
743 | Opt_read_write, | |
80de1912 | 744 | Opt_lock_on_read, |
e010dd0a | 745 | Opt_exclusive, |
d9360540 | 746 | Opt_notrim, |
210c104c | 747 | Opt_err |
59c2be1e YS |
748 | }; |
749 | ||
43ae4701 | 750 | static match_table_t rbd_opts_tokens = { |
b5584180 | 751 | {Opt_queue_depth, "queue_depth=%d"}, |
34f55d0b | 752 | {Opt_lock_timeout, "lock_timeout=%d"}, |
59c2be1e | 753 | /* int args above */ |
b26c047b | 754 | {Opt_pool_ns, "_pool_ns=%s"}, |
59c2be1e | 755 | /* string args above */ |
be466c1c | 756 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
757 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
758 | {Opt_read_write, "read_write"}, | |
759 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 760 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 761 | {Opt_exclusive, "exclusive"}, |
d9360540 | 762 | {Opt_notrim, "notrim"}, |
210c104c | 763 | {Opt_err, NULL} |
59c2be1e YS |
764 | }; |
765 | ||
98571b5a | 766 | struct rbd_options { |
b5584180 | 767 | int queue_depth; |
34f55d0b | 768 | unsigned long lock_timeout; |
98571b5a | 769 | bool read_only; |
80de1912 | 770 | bool lock_on_read; |
e010dd0a | 771 | bool exclusive; |
d9360540 | 772 | bool trim; |
98571b5a AE |
773 | }; |
774 | ||
b5584180 | 775 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
34f55d0b | 776 | #define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
98571b5a | 777 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 778 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 779 | #define RBD_EXCLUSIVE_DEFAULT false |
d9360540 | 780 | #define RBD_TRIM_DEFAULT true |
98571b5a | 781 | |
c300156b ID |
782 | struct parse_rbd_opts_ctx { |
783 | struct rbd_spec *spec; | |
784 | struct rbd_options *opts; | |
785 | }; | |
786 | ||
59c2be1e YS |
787 | static int parse_rbd_opts_token(char *c, void *private) |
788 | { | |
c300156b | 789 | struct parse_rbd_opts_ctx *pctx = private; |
59c2be1e YS |
790 | substring_t argstr[MAX_OPT_ARGS]; |
791 | int token, intval, ret; | |
792 | ||
43ae4701 | 793 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
794 | if (token < Opt_last_int) { |
795 | ret = match_int(&argstr[0], &intval); | |
796 | if (ret < 0) { | |
2f56b6ba | 797 | pr_err("bad option arg (not int) at '%s'\n", c); |
59c2be1e YS |
798 | return ret; |
799 | } | |
800 | dout("got int token %d val %d\n", token, intval); | |
801 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 802 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
803 | } else { |
804 | dout("got token %d\n", token); | |
805 | } | |
806 | ||
807 | switch (token) { | |
b5584180 ID |
808 | case Opt_queue_depth: |
809 | if (intval < 1) { | |
810 | pr_err("queue_depth out of range\n"); | |
811 | return -EINVAL; | |
812 | } | |
c300156b | 813 | pctx->opts->queue_depth = intval; |
b5584180 | 814 | break; |
34f55d0b DY |
815 | case Opt_lock_timeout: |
816 | /* 0 is "wait forever" (i.e. infinite timeout) */ | |
817 | if (intval < 0 || intval > INT_MAX / 1000) { | |
818 | pr_err("lock_timeout out of range\n"); | |
819 | return -EINVAL; | |
820 | } | |
c300156b | 821 | pctx->opts->lock_timeout = msecs_to_jiffies(intval * 1000); |
34f55d0b | 822 | break; |
b26c047b ID |
823 | case Opt_pool_ns: |
824 | kfree(pctx->spec->pool_ns); | |
825 | pctx->spec->pool_ns = match_strdup(argstr); | |
826 | if (!pctx->spec->pool_ns) | |
827 | return -ENOMEM; | |
34f55d0b | 828 | break; |
cc0538b6 | 829 | case Opt_read_only: |
c300156b | 830 | pctx->opts->read_only = true; |
cc0538b6 AE |
831 | break; |
832 | case Opt_read_write: | |
c300156b | 833 | pctx->opts->read_only = false; |
cc0538b6 | 834 | break; |
80de1912 | 835 | case Opt_lock_on_read: |
c300156b | 836 | pctx->opts->lock_on_read = true; |
80de1912 | 837 | break; |
e010dd0a | 838 | case Opt_exclusive: |
c300156b | 839 | pctx->opts->exclusive = true; |
e010dd0a | 840 | break; |
d9360540 | 841 | case Opt_notrim: |
c300156b | 842 | pctx->opts->trim = false; |
d9360540 | 843 | break; |
59c2be1e | 844 | default: |
210c104c ID |
845 | /* libceph prints "bad option" msg */ |
846 | return -EINVAL; | |
59c2be1e | 847 | } |
210c104c | 848 | |
59c2be1e YS |
849 | return 0; |
850 | } | |
851 | ||
6d2940c8 GZ |
852 | static char* obj_op_name(enum obj_operation_type op_type) |
853 | { | |
854 | switch (op_type) { | |
855 | case OBJ_OP_READ: | |
856 | return "read"; | |
857 | case OBJ_OP_WRITE: | |
858 | return "write"; | |
90e98c52 GZ |
859 | case OBJ_OP_DISCARD: |
860 | return "discard"; | |
6d2940c8 GZ |
861 | default: |
862 | return "???"; | |
863 | } | |
864 | } | |
865 | ||
602adf40 YS |
866 | /* |
867 | * Destroy ceph client | |
d23a4b3f | 868 | * |
432b8587 | 869 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
870 | */ |
871 | static void rbd_client_release(struct kref *kref) | |
872 | { | |
873 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
874 | ||
37206ee5 | 875 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 876 | spin_lock(&rbd_client_list_lock); |
602adf40 | 877 | list_del(&rbdc->node); |
cd9d9f5d | 878 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
879 | |
880 | ceph_destroy_client(rbdc->client); | |
881 | kfree(rbdc); | |
882 | } | |
883 | ||
884 | /* | |
885 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
886 | * it. | |
887 | */ | |
9d3997fd | 888 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 889 | { |
c53d5893 AE |
890 | if (rbdc) |
891 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
892 | } |
893 | ||
dd435855 ID |
894 | static int wait_for_latest_osdmap(struct ceph_client *client) |
895 | { | |
896 | u64 newest_epoch; | |
897 | int ret; | |
898 | ||
899 | ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch); | |
900 | if (ret) | |
901 | return ret; | |
902 | ||
903 | if (client->osdc.osdmap->epoch >= newest_epoch) | |
904 | return 0; | |
905 | ||
906 | ceph_osdc_maybe_request_map(&client->osdc); | |
907 | return ceph_monc_wait_osdmap(&client->monc, newest_epoch, | |
908 | client->options->mount_timeout); | |
909 | } | |
910 | ||
5feb0d8d ID |
911 | /* |
912 | * Get a ceph client with specific addr and configuration, if one does | |
913 | * not exist create it. Either way, ceph_opts is consumed by this | |
914 | * function. | |
915 | */ | |
916 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) | |
917 | { | |
918 | struct rbd_client *rbdc; | |
dd435855 | 919 | int ret; |
5feb0d8d ID |
920 | |
921 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); | |
922 | rbdc = rbd_client_find(ceph_opts); | |
dd435855 | 923 | if (rbdc) { |
5feb0d8d | 924 | ceph_destroy_options(ceph_opts); |
dd435855 ID |
925 | |
926 | /* | |
927 | * Using an existing client. Make sure ->pg_pools is up to | |
928 | * date before we look up the pool id in do_rbd_add(). | |
929 | */ | |
930 | ret = wait_for_latest_osdmap(rbdc->client); | |
931 | if (ret) { | |
932 | rbd_warn(NULL, "failed to get latest osdmap: %d", ret); | |
933 | rbd_put_client(rbdc); | |
934 | rbdc = ERR_PTR(ret); | |
935 | } | |
936 | } else { | |
5feb0d8d | 937 | rbdc = rbd_client_create(ceph_opts); |
dd435855 | 938 | } |
5feb0d8d ID |
939 | mutex_unlock(&client_mutex); |
940 | ||
941 | return rbdc; | |
942 | } | |
943 | ||
a30b71b9 AE |
944 | static bool rbd_image_format_valid(u32 image_format) |
945 | { | |
946 | return image_format == 1 || image_format == 2; | |
947 | } | |
948 | ||
8e94af8e AE |
949 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
950 | { | |
103a150f AE |
951 | size_t size; |
952 | u32 snap_count; | |
953 | ||
954 | /* The header has to start with the magic rbd header text */ | |
955 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
956 | return false; | |
957 | ||
db2388b6 AE |
958 | /* The bio layer requires at least sector-sized I/O */ |
959 | ||
960 | if (ondisk->options.order < SECTOR_SHIFT) | |
961 | return false; | |
962 | ||
963 | /* If we use u64 in a few spots we may be able to loosen this */ | |
964 | ||
965 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
966 | return false; | |
967 | ||
103a150f AE |
968 | /* |
969 | * The size of a snapshot header has to fit in a size_t, and | |
970 | * that limits the number of snapshots. | |
971 | */ | |
972 | snap_count = le32_to_cpu(ondisk->snap_count); | |
973 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
974 | if (snap_count > size / sizeof (__le64)) | |
975 | return false; | |
976 | ||
977 | /* | |
978 | * Not only that, but the size of the entire the snapshot | |
979 | * header must also be representable in a size_t. | |
980 | */ | |
981 | size -= snap_count * sizeof (__le64); | |
982 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
983 | return false; | |
984 | ||
985 | return true; | |
8e94af8e AE |
986 | } |
987 | ||
5bc3fb17 ID |
988 | /* |
989 | * returns the size of an object in the image | |
990 | */ | |
991 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
992 | { | |
993 | return 1U << header->obj_order; | |
994 | } | |
995 | ||
263423f8 ID |
996 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
997 | { | |
998 | if (rbd_dev->header.stripe_unit == 0 || | |
999 | rbd_dev->header.stripe_count == 0) { | |
1000 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
1001 | rbd_dev->header.stripe_count = 1; | |
1002 | } | |
1003 | ||
1004 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
1005 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
1006 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
1007 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
1008 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
1009 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
1010 | } | |
1011 | ||
602adf40 | 1012 | /* |
bb23e37a AE |
1013 | * Fill an rbd image header with information from the given format 1 |
1014 | * on-disk header. | |
602adf40 | 1015 | */ |
662518b1 | 1016 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 1017 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 1018 | { |
662518b1 | 1019 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
1020 | bool first_time = header->object_prefix == NULL; |
1021 | struct ceph_snap_context *snapc; | |
1022 | char *object_prefix = NULL; | |
1023 | char *snap_names = NULL; | |
1024 | u64 *snap_sizes = NULL; | |
ccece235 | 1025 | u32 snap_count; |
bb23e37a | 1026 | int ret = -ENOMEM; |
621901d6 | 1027 | u32 i; |
602adf40 | 1028 | |
bb23e37a | 1029 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1030 | |
bb23e37a | 1031 | if (first_time) { |
848d796c ID |
1032 | object_prefix = kstrndup(ondisk->object_prefix, |
1033 | sizeof(ondisk->object_prefix), | |
1034 | GFP_KERNEL); | |
bb23e37a AE |
1035 | if (!object_prefix) |
1036 | return -ENOMEM; | |
bb23e37a | 1037 | } |
00f1f36f | 1038 | |
bb23e37a | 1039 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1040 | |
bb23e37a AE |
1041 | snap_count = le32_to_cpu(ondisk->snap_count); |
1042 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1043 | if (!snapc) | |
1044 | goto out_err; | |
1045 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1046 | if (snap_count) { |
bb23e37a | 1047 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1048 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1049 | ||
bb23e37a | 1050 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1051 | |
bb23e37a AE |
1052 | if (snap_names_len > (u64)SIZE_MAX) |
1053 | goto out_2big; | |
1054 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1055 | if (!snap_names) | |
6a52325f AE |
1056 | goto out_err; |
1057 | ||
bb23e37a | 1058 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1059 | snap_sizes = kmalloc_array(snap_count, |
1060 | sizeof(*header->snap_sizes), | |
1061 | GFP_KERNEL); | |
bb23e37a | 1062 | if (!snap_sizes) |
6a52325f | 1063 | goto out_err; |
bb23e37a | 1064 | |
f785cc1d | 1065 | /* |
bb23e37a AE |
1066 | * Copy the names, and fill in each snapshot's id |
1067 | * and size. | |
1068 | * | |
99a41ebc | 1069 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1070 | * ondisk buffer we're working with has |
f785cc1d AE |
1071 | * snap_names_len bytes beyond the end of the |
1072 | * snapshot id array, this memcpy() is safe. | |
1073 | */ | |
bb23e37a AE |
1074 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1075 | snaps = ondisk->snaps; | |
1076 | for (i = 0; i < snap_count; i++) { | |
1077 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1078 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1079 | } | |
602adf40 | 1080 | } |
6a52325f | 1081 | |
bb23e37a | 1082 | /* We won't fail any more, fill in the header */ |
621901d6 | 1083 | |
bb23e37a AE |
1084 | if (first_time) { |
1085 | header->object_prefix = object_prefix; | |
1086 | header->obj_order = ondisk->options.order; | |
263423f8 | 1087 | rbd_init_layout(rbd_dev); |
602adf40 | 1088 | } else { |
662518b1 AE |
1089 | ceph_put_snap_context(header->snapc); |
1090 | kfree(header->snap_names); | |
1091 | kfree(header->snap_sizes); | |
602adf40 | 1092 | } |
849b4260 | 1093 | |
bb23e37a | 1094 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1095 | |
f84344f3 | 1096 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1097 | header->snapc = snapc; |
1098 | header->snap_names = snap_names; | |
1099 | header->snap_sizes = snap_sizes; | |
468521c1 | 1100 | |
602adf40 | 1101 | return 0; |
bb23e37a AE |
1102 | out_2big: |
1103 | ret = -EIO; | |
6a52325f | 1104 | out_err: |
bb23e37a AE |
1105 | kfree(snap_sizes); |
1106 | kfree(snap_names); | |
1107 | ceph_put_snap_context(snapc); | |
1108 | kfree(object_prefix); | |
ccece235 | 1109 | |
bb23e37a | 1110 | return ret; |
602adf40 YS |
1111 | } |
1112 | ||
9682fc6d AE |
1113 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1114 | { | |
1115 | const char *snap_name; | |
1116 | ||
1117 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1118 | ||
1119 | /* Skip over names until we find the one we are looking for */ | |
1120 | ||
1121 | snap_name = rbd_dev->header.snap_names; | |
1122 | while (which--) | |
1123 | snap_name += strlen(snap_name) + 1; | |
1124 | ||
1125 | return kstrdup(snap_name, GFP_KERNEL); | |
1126 | } | |
1127 | ||
30d1cff8 AE |
1128 | /* |
1129 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1130 | * Note that result is for snapshots in *descending* order. | |
1131 | */ | |
1132 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1133 | { | |
1134 | u64 snap_id1 = *(u64 *)s1; | |
1135 | u64 snap_id2 = *(u64 *)s2; | |
1136 | ||
1137 | if (snap_id1 < snap_id2) | |
1138 | return 1; | |
1139 | return snap_id1 == snap_id2 ? 0 : -1; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Search a snapshot context to see if the given snapshot id is | |
1144 | * present. | |
1145 | * | |
1146 | * Returns the position of the snapshot id in the array if it's found, | |
1147 | * or BAD_SNAP_INDEX otherwise. | |
1148 | * | |
1149 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1150 | * reverse order, highest snapshot id first. | |
1151 | */ | |
9682fc6d AE |
1152 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1153 | { | |
1154 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1155 | u64 *found; |
9682fc6d | 1156 | |
30d1cff8 AE |
1157 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1158 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1159 | |
30d1cff8 | 1160 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1161 | } |
1162 | ||
2ad3d716 AE |
1163 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1164 | u64 snap_id) | |
9e15b77d | 1165 | { |
54cac61f | 1166 | u32 which; |
da6a6b63 | 1167 | const char *snap_name; |
9e15b77d | 1168 | |
54cac61f AE |
1169 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1170 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1171 | return ERR_PTR(-ENOENT); |
54cac61f | 1172 | |
da6a6b63 JD |
1173 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1174 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1175 | } |
1176 | ||
1177 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1178 | { | |
9e15b77d AE |
1179 | if (snap_id == CEPH_NOSNAP) |
1180 | return RBD_SNAP_HEAD_NAME; | |
1181 | ||
54cac61f AE |
1182 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1183 | if (rbd_dev->image_format == 1) | |
1184 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1185 | |
54cac61f | 1186 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1187 | } |
1188 | ||
2ad3d716 AE |
1189 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1190 | u64 *snap_size) | |
602adf40 | 1191 | { |
2ad3d716 AE |
1192 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1193 | if (snap_id == CEPH_NOSNAP) { | |
1194 | *snap_size = rbd_dev->header.image_size; | |
1195 | } else if (rbd_dev->image_format == 1) { | |
1196 | u32 which; | |
602adf40 | 1197 | |
2ad3d716 AE |
1198 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1199 | if (which == BAD_SNAP_INDEX) | |
1200 | return -ENOENT; | |
e86924a8 | 1201 | |
2ad3d716 AE |
1202 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1203 | } else { | |
1204 | u64 size = 0; | |
1205 | int ret; | |
1206 | ||
1207 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1208 | if (ret) | |
1209 | return ret; | |
1210 | ||
1211 | *snap_size = size; | |
1212 | } | |
1213 | return 0; | |
602adf40 YS |
1214 | } |
1215 | ||
2ad3d716 AE |
1216 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1217 | u64 *snap_features) | |
602adf40 | 1218 | { |
2ad3d716 AE |
1219 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1220 | if (snap_id == CEPH_NOSNAP) { | |
1221 | *snap_features = rbd_dev->header.features; | |
1222 | } else if (rbd_dev->image_format == 1) { | |
1223 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1224 | } else { |
2ad3d716 AE |
1225 | u64 features = 0; |
1226 | int ret; | |
8b0241f8 | 1227 | |
2ad3d716 AE |
1228 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1229 | if (ret) | |
1230 | return ret; | |
1231 | ||
1232 | *snap_features = features; | |
1233 | } | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1238 | { | |
8f4b7d98 | 1239 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1240 | u64 size = 0; |
1241 | u64 features = 0; | |
1242 | int ret; | |
1243 | ||
2ad3d716 AE |
1244 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1245 | if (ret) | |
1246 | return ret; | |
1247 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1248 | if (ret) | |
1249 | return ret; | |
1250 | ||
1251 | rbd_dev->mapping.size = size; | |
1252 | rbd_dev->mapping.features = features; | |
1253 | ||
8b0241f8 | 1254 | return 0; |
602adf40 YS |
1255 | } |
1256 | ||
d1cf5788 AE |
1257 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1258 | { | |
1259 | rbd_dev->mapping.size = 0; | |
1260 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1261 | } |
1262 | ||
5359a17d | 1263 | static void zero_bvec(struct bio_vec *bv) |
602adf40 | 1264 | { |
602adf40 | 1265 | void *buf; |
5359a17d | 1266 | unsigned long flags; |
602adf40 | 1267 | |
5359a17d ID |
1268 | buf = bvec_kmap_irq(bv, &flags); |
1269 | memset(buf, 0, bv->bv_len); | |
1270 | flush_dcache_page(bv->bv_page); | |
1271 | bvec_kunmap_irq(buf, &flags); | |
602adf40 YS |
1272 | } |
1273 | ||
5359a17d | 1274 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
b9434c5b | 1275 | { |
5359a17d | 1276 | struct ceph_bio_iter it = *bio_pos; |
b9434c5b | 1277 | |
5359a17d ID |
1278 | ceph_bio_iter_advance(&it, off); |
1279 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1280 | zero_bvec(&bv); | |
1281 | })); | |
b9434c5b AE |
1282 | } |
1283 | ||
7e07efb1 | 1284 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
602adf40 | 1285 | { |
7e07efb1 | 1286 | struct ceph_bvec_iter it = *bvec_pos; |
602adf40 | 1287 | |
7e07efb1 ID |
1288 | ceph_bvec_iter_advance(&it, off); |
1289 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1290 | zero_bvec(&bv); | |
1291 | })); | |
f7760dad AE |
1292 | } |
1293 | ||
1294 | /* | |
3da691bf | 1295 | * Zero a range in @obj_req data buffer defined by a bio (list) or |
afb97888 | 1296 | * (private) bio_vec array. |
f7760dad | 1297 | * |
3da691bf | 1298 | * @off is relative to the start of the data buffer. |
926f9b3f | 1299 | */ |
3da691bf ID |
1300 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
1301 | u32 bytes) | |
926f9b3f | 1302 | { |
ecc633ca | 1303 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1304 | case OBJ_REQUEST_BIO: |
1305 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1306 | break; | |
1307 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1308 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf ID |
1309 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
1310 | break; | |
1311 | default: | |
1312 | rbd_assert(0); | |
6365d33a AE |
1313 | } |
1314 | } | |
1315 | ||
bf0d5f50 AE |
1316 | static void rbd_obj_request_destroy(struct kref *kref); |
1317 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1318 | { | |
1319 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1320 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1321 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1322 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1323 | } | |
1324 | ||
0f2d5be7 AE |
1325 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1326 | { | |
1327 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1328 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1329 | kref_get(&img_request->kref); |
1330 | } | |
1331 | ||
bf0d5f50 AE |
1332 | static void rbd_img_request_destroy(struct kref *kref); |
1333 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1334 | { | |
1335 | rbd_assert(img_request != NULL); | |
37206ee5 | 1336 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1337 | kref_read(&img_request->kref)); |
e93aca0a | 1338 | kref_put(&img_request->kref, rbd_img_request_destroy); |
bf0d5f50 AE |
1339 | } |
1340 | ||
1341 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1342 | struct rbd_obj_request *obj_request) | |
1343 | { | |
25dcf954 AE |
1344 | rbd_assert(obj_request->img_request == NULL); |
1345 | ||
b155e86c | 1346 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1347 | obj_request->img_request = img_request; |
25dcf954 | 1348 | img_request->obj_request_count++; |
7114edac | 1349 | img_request->pending_count++; |
15961b44 | 1350 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
bf0d5f50 AE |
1351 | } |
1352 | ||
1353 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1354 | struct rbd_obj_request *obj_request) | |
1355 | { | |
15961b44 | 1356 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
43df3d35 | 1357 | list_del(&obj_request->ex.oe_item); |
25dcf954 AE |
1358 | rbd_assert(img_request->obj_request_count > 0); |
1359 | img_request->obj_request_count--; | |
bf0d5f50 | 1360 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 AE |
1361 | rbd_obj_request_put(obj_request); |
1362 | } | |
1363 | ||
980917fc | 1364 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1365 | { |
980917fc ID |
1366 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1367 | ||
a90bb0c1 | 1368 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
43df3d35 ID |
1369 | obj_request, obj_request->ex.oe_objno, obj_request->ex.oe_off, |
1370 | obj_request->ex.oe_len, osd_req); | |
980917fc | 1371 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1372 | } |
1373 | ||
0c425248 AE |
1374 | /* |
1375 | * The default/initial value for all image request flags is 0. Each | |
1376 | * is conditionally set to 1 at image request initialization time | |
1377 | * and currently never change thereafter. | |
1378 | */ | |
d0b2e944 AE |
1379 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1380 | { | |
1381 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1382 | smp_mb(); | |
1383 | } | |
1384 | ||
a2acd00e AE |
1385 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1386 | { | |
1387 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1388 | smp_mb(); | |
1389 | } | |
1390 | ||
d0b2e944 AE |
1391 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1392 | { | |
1393 | smp_mb(); | |
1394 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1395 | } | |
1396 | ||
3da691bf | 1397 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
6e2a4505 | 1398 | { |
3da691bf | 1399 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
b9434c5b | 1400 | |
43df3d35 ID |
1401 | return !obj_req->ex.oe_off && |
1402 | obj_req->ex.oe_len == rbd_dev->layout.object_size; | |
6e2a4505 AE |
1403 | } |
1404 | ||
3da691bf | 1405 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1406 | { |
3da691bf | 1407 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
bf0d5f50 | 1408 | |
43df3d35 | 1409 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
3da691bf | 1410 | rbd_dev->layout.object_size; |
0dcc685e ID |
1411 | } |
1412 | ||
86bd7998 | 1413 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1414 | { |
86bd7998 ID |
1415 | return ceph_file_extents_bytes(obj_req->img_extents, |
1416 | obj_req->num_img_extents); | |
bf0d5f50 AE |
1417 | } |
1418 | ||
3da691bf | 1419 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
bf0d5f50 | 1420 | { |
9bb0248d | 1421 | switch (img_req->op_type) { |
3da691bf ID |
1422 | case OBJ_OP_READ: |
1423 | return false; | |
1424 | case OBJ_OP_WRITE: | |
1425 | case OBJ_OP_DISCARD: | |
1426 | return true; | |
1427 | default: | |
c6244b3b | 1428 | BUG(); |
3da691bf | 1429 | } |
90e98c52 GZ |
1430 | } |
1431 | ||
3da691bf | 1432 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); |
2761713d | 1433 | |
85e084fe | 1434 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1435 | { |
3da691bf | 1436 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
bf0d5f50 | 1437 | |
3da691bf ID |
1438 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1439 | osd_req->r_result, obj_req); | |
1440 | rbd_assert(osd_req == obj_req->osd_req); | |
bf0d5f50 | 1441 | |
3da691bf ID |
1442 | obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0; |
1443 | if (!obj_req->result && !rbd_img_is_write(obj_req->img_request)) | |
1444 | obj_req->xferred = osd_req->r_result; | |
1445 | else | |
1446 | /* | |
1447 | * Writes aren't allowed to return a data payload. In some | |
1448 | * guarded write cases (e.g. stat + zero on an empty object) | |
1449 | * a stat response makes it through, but we don't care. | |
1450 | */ | |
1451 | obj_req->xferred = 0; | |
bf0d5f50 | 1452 | |
3da691bf | 1453 | rbd_obj_handle_request(obj_req); |
bf0d5f50 AE |
1454 | } |
1455 | ||
9d4df01f | 1456 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1457 | { |
8c042b0d | 1458 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1459 | |
a162b308 | 1460 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
7c84883a | 1461 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1462 | } |
1463 | ||
1464 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1465 | { | |
9d4df01f | 1466 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1467 | |
a162b308 | 1468 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
fac02ddf | 1469 | ktime_get_real_ts64(&osd_req->r_mtime); |
43df3d35 | 1470 | osd_req->r_data_offset = obj_request->ex.oe_off; |
430c28c3 AE |
1471 | } |
1472 | ||
bc81207e | 1473 | static struct ceph_osd_request * |
a162b308 | 1474 | rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops) |
bc81207e | 1475 | { |
a162b308 ID |
1476 | struct rbd_img_request *img_req = obj_req->img_request; |
1477 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
bc81207e ID |
1478 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1479 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1480 | const char *name_format = rbd_dev->image_format == 1 ? |
1481 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e | 1482 | |
a162b308 ID |
1483 | req = ceph_osdc_alloc_request(osdc, |
1484 | (rbd_img_is_write(img_req) ? img_req->snapc : NULL), | |
1485 | num_ops, false, GFP_NOIO); | |
bc81207e ID |
1486 | if (!req) |
1487 | return NULL; | |
1488 | ||
bc81207e | 1489 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1490 | req->r_priv = obj_req; |
bc81207e | 1491 | |
b26c047b ID |
1492 | /* |
1493 | * Data objects may be stored in a separate pool, but always in | |
1494 | * the same namespace in that pool as the header in its pool. | |
1495 | */ | |
1496 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); | |
bc81207e | 1497 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
b26c047b | 1498 | |
a90bb0c1 | 1499 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
43df3d35 | 1500 | rbd_dev->header.object_prefix, obj_req->ex.oe_objno)) |
bc81207e ID |
1501 | goto err_req; |
1502 | ||
bc81207e ID |
1503 | return req; |
1504 | ||
1505 | err_req: | |
1506 | ceph_osdc_put_request(req); | |
1507 | return NULL; | |
1508 | } | |
1509 | ||
bf0d5f50 AE |
1510 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1511 | { | |
1512 | ceph_osdc_put_request(osd_req); | |
1513 | } | |
1514 | ||
ecc633ca | 1515 | static struct rbd_obj_request *rbd_obj_request_create(void) |
bf0d5f50 AE |
1516 | { |
1517 | struct rbd_obj_request *obj_request; | |
bf0d5f50 | 1518 | |
5a60e876 | 1519 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1520 | if (!obj_request) |
f907ad55 | 1521 | return NULL; |
f907ad55 | 1522 | |
43df3d35 | 1523 | ceph_object_extent_init(&obj_request->ex); |
bf0d5f50 AE |
1524 | kref_init(&obj_request->kref); |
1525 | ||
67e2b652 | 1526 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1527 | return obj_request; |
1528 | } | |
1529 | ||
1530 | static void rbd_obj_request_destroy(struct kref *kref) | |
1531 | { | |
1532 | struct rbd_obj_request *obj_request; | |
7e07efb1 | 1533 | u32 i; |
bf0d5f50 AE |
1534 | |
1535 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1536 | ||
37206ee5 AE |
1537 | dout("%s: obj %p\n", __func__, obj_request); |
1538 | ||
bf0d5f50 AE |
1539 | if (obj_request->osd_req) |
1540 | rbd_osd_req_destroy(obj_request->osd_req); | |
1541 | ||
ecc633ca | 1542 | switch (obj_request->img_request->data_type) { |
9969ebc5 | 1543 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1544 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1545 | case OBJ_REQUEST_BVECS: |
5359a17d | 1546 | break; /* Nothing to do */ |
afb97888 ID |
1547 | case OBJ_REQUEST_OWN_BVECS: |
1548 | kfree(obj_request->bvec_pos.bvecs); | |
788e2df3 | 1549 | break; |
7e07efb1 ID |
1550 | default: |
1551 | rbd_assert(0); | |
bf0d5f50 AE |
1552 | } |
1553 | ||
86bd7998 | 1554 | kfree(obj_request->img_extents); |
7e07efb1 ID |
1555 | if (obj_request->copyup_bvecs) { |
1556 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1557 | if (obj_request->copyup_bvecs[i].bv_page) | |
1558 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1559 | } | |
1560 | kfree(obj_request->copyup_bvecs); | |
bf0d5f50 AE |
1561 | } |
1562 | ||
868311b1 | 1563 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1564 | } |
1565 | ||
fb65d228 AE |
1566 | /* It's OK to call this for a device with no parent */ |
1567 | ||
1568 | static void rbd_spec_put(struct rbd_spec *spec); | |
1569 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1570 | { | |
1571 | rbd_dev_remove_parent(rbd_dev); | |
1572 | rbd_spec_put(rbd_dev->parent_spec); | |
1573 | rbd_dev->parent_spec = NULL; | |
1574 | rbd_dev->parent_overlap = 0; | |
1575 | } | |
1576 | ||
a2acd00e AE |
1577 | /* |
1578 | * Parent image reference counting is used to determine when an | |
1579 | * image's parent fields can be safely torn down--after there are no | |
1580 | * more in-flight requests to the parent image. When the last | |
1581 | * reference is dropped, cleaning them up is safe. | |
1582 | */ | |
1583 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1584 | { | |
1585 | int counter; | |
1586 | ||
1587 | if (!rbd_dev->parent_spec) | |
1588 | return; | |
1589 | ||
1590 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1591 | if (counter > 0) | |
1592 | return; | |
1593 | ||
1594 | /* Last reference; clean up parent data structures */ | |
1595 | ||
1596 | if (!counter) | |
1597 | rbd_dev_unparent(rbd_dev); | |
1598 | else | |
9584d508 | 1599 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1600 | } |
1601 | ||
1602 | /* | |
1603 | * If an image has a non-zero parent overlap, get a reference to its | |
1604 | * parent. | |
1605 | * | |
1606 | * Returns true if the rbd device has a parent with a non-zero | |
1607 | * overlap and a reference for it was successfully taken, or | |
1608 | * false otherwise. | |
1609 | */ | |
1610 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1611 | { | |
ae43e9d0 | 1612 | int counter = 0; |
a2acd00e AE |
1613 | |
1614 | if (!rbd_dev->parent_spec) | |
1615 | return false; | |
1616 | ||
ae43e9d0 ID |
1617 | down_read(&rbd_dev->header_rwsem); |
1618 | if (rbd_dev->parent_overlap) | |
1619 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
1620 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
1621 | |
1622 | if (counter < 0) | |
9584d508 | 1623 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1624 | |
ae43e9d0 | 1625 | return counter > 0; |
a2acd00e AE |
1626 | } |
1627 | ||
bf0d5f50 AE |
1628 | /* |
1629 | * Caller is responsible for filling in the list of object requests | |
1630 | * that comprises the image request, and the Linux request pointer | |
1631 | * (if there is one). | |
1632 | */ | |
cc344fa1 AE |
1633 | static struct rbd_img_request *rbd_img_request_create( |
1634 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1635 | enum obj_operation_type op_type, |
4e752f0a | 1636 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
1637 | { |
1638 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1639 | |
a0c5895b | 1640 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
1641 | if (!img_request) |
1642 | return NULL; | |
1643 | ||
bf0d5f50 | 1644 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1645 | img_request->op_type = op_type; |
9bb0248d | 1646 | if (!rbd_img_is_write(img_request)) |
bf0d5f50 | 1647 | img_request->snap_id = rbd_dev->spec->snap_id; |
9bb0248d ID |
1648 | else |
1649 | img_request->snapc = snapc; | |
1650 | ||
a2acd00e | 1651 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 1652 | img_request_layered_set(img_request); |
a0c5895b | 1653 | |
bf0d5f50 | 1654 | spin_lock_init(&img_request->completion_lock); |
43df3d35 | 1655 | INIT_LIST_HEAD(&img_request->object_extents); |
bf0d5f50 AE |
1656 | kref_init(&img_request->kref); |
1657 | ||
dfd9875f ID |
1658 | dout("%s: rbd_dev %p %s -> img %p\n", __func__, rbd_dev, |
1659 | obj_op_name(op_type), img_request); | |
bf0d5f50 AE |
1660 | return img_request; |
1661 | } | |
1662 | ||
1663 | static void rbd_img_request_destroy(struct kref *kref) | |
1664 | { | |
1665 | struct rbd_img_request *img_request; | |
1666 | struct rbd_obj_request *obj_request; | |
1667 | struct rbd_obj_request *next_obj_request; | |
1668 | ||
1669 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1670 | ||
37206ee5 AE |
1671 | dout("%s: img %p\n", __func__, img_request); |
1672 | ||
bf0d5f50 AE |
1673 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1674 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1675 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1676 | |
a2acd00e AE |
1677 | if (img_request_layered_test(img_request)) { |
1678 | img_request_layered_clear(img_request); | |
1679 | rbd_dev_parent_put(img_request->rbd_dev); | |
1680 | } | |
1681 | ||
9bb0248d | 1682 | if (rbd_img_is_write(img_request)) |
812164f8 | 1683 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1684 | |
1c2a9dfe | 1685 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1686 | } |
1687 | ||
86bd7998 ID |
1688 | static void prune_extents(struct ceph_file_extent *img_extents, |
1689 | u32 *num_img_extents, u64 overlap) | |
e93f3152 | 1690 | { |
86bd7998 | 1691 | u32 cnt = *num_img_extents; |
e93f3152 | 1692 | |
86bd7998 ID |
1693 | /* drop extents completely beyond the overlap */ |
1694 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) | |
1695 | cnt--; | |
e93f3152 | 1696 | |
86bd7998 ID |
1697 | if (cnt) { |
1698 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; | |
e93f3152 | 1699 | |
86bd7998 ID |
1700 | /* trim final overlapping extent */ |
1701 | if (ex->fe_off + ex->fe_len > overlap) | |
1702 | ex->fe_len = overlap - ex->fe_off; | |
1703 | } | |
e93f3152 | 1704 | |
86bd7998 | 1705 | *num_img_extents = cnt; |
e93f3152 AE |
1706 | } |
1707 | ||
86bd7998 ID |
1708 | /* |
1709 | * Determine the byte range(s) covered by either just the object extent | |
1710 | * or the entire object in the parent image. | |
1711 | */ | |
1712 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, | |
1713 | bool entire) | |
e93f3152 | 1714 | { |
86bd7998 ID |
1715 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1716 | int ret; | |
e93f3152 | 1717 | |
86bd7998 ID |
1718 | if (!rbd_dev->parent_overlap) |
1719 | return 0; | |
e93f3152 | 1720 | |
86bd7998 ID |
1721 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
1722 | entire ? 0 : obj_req->ex.oe_off, | |
1723 | entire ? rbd_dev->layout.object_size : | |
1724 | obj_req->ex.oe_len, | |
1725 | &obj_req->img_extents, | |
1726 | &obj_req->num_img_extents); | |
1727 | if (ret) | |
1728 | return ret; | |
e93f3152 | 1729 | |
86bd7998 ID |
1730 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
1731 | rbd_dev->parent_overlap); | |
1732 | return 0; | |
e93f3152 AE |
1733 | } |
1734 | ||
3da691bf | 1735 | static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) |
1217857f | 1736 | { |
ecc633ca | 1737 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1738 | case OBJ_REQUEST_BIO: |
1739 | osd_req_op_extent_osd_data_bio(obj_req->osd_req, which, | |
1740 | &obj_req->bio_pos, | |
43df3d35 | 1741 | obj_req->ex.oe_len); |
3da691bf ID |
1742 | break; |
1743 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1744 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf | 1745 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
43df3d35 | 1746 | obj_req->ex.oe_len); |
afb97888 | 1747 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
3da691bf ID |
1748 | osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which, |
1749 | &obj_req->bvec_pos); | |
1750 | break; | |
1751 | default: | |
1752 | rbd_assert(0); | |
1217857f | 1753 | } |
3da691bf | 1754 | } |
1217857f | 1755 | |
3da691bf ID |
1756 | static int rbd_obj_setup_read(struct rbd_obj_request *obj_req) |
1757 | { | |
a162b308 | 1758 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); |
3da691bf ID |
1759 | if (!obj_req->osd_req) |
1760 | return -ENOMEM; | |
2a842aca | 1761 | |
3da691bf | 1762 | osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ, |
43df3d35 | 1763 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1764 | rbd_osd_req_setup_data(obj_req, 0); |
7ad18afa | 1765 | |
3da691bf ID |
1766 | rbd_osd_req_format_read(obj_req); |
1767 | return 0; | |
1768 | } | |
1769 | ||
1770 | static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req, | |
1771 | unsigned int which) | |
1772 | { | |
1773 | struct page **pages; | |
8b3e1a56 | 1774 | |
3da691bf ID |
1775 | /* |
1776 | * The response data for a STAT call consists of: | |
1777 | * le64 length; | |
1778 | * struct { | |
1779 | * le32 tv_sec; | |
1780 | * le32 tv_nsec; | |
1781 | * } mtime; | |
1782 | */ | |
1783 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
1784 | if (IS_ERR(pages)) | |
1785 | return PTR_ERR(pages); | |
1786 | ||
1787 | osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0); | |
1788 | osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages, | |
1789 | 8 + sizeof(struct ceph_timespec), | |
1790 | 0, false, true); | |
1791 | return 0; | |
1217857f AE |
1792 | } |
1793 | ||
3da691bf ID |
1794 | static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req, |
1795 | unsigned int which) | |
2169238d | 1796 | { |
3da691bf ID |
1797 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1798 | u16 opcode; | |
2169238d | 1799 | |
3da691bf ID |
1800 | osd_req_op_alloc_hint_init(obj_req->osd_req, which++, |
1801 | rbd_dev->layout.object_size, | |
1802 | rbd_dev->layout.object_size); | |
2169238d | 1803 | |
3da691bf ID |
1804 | if (rbd_obj_is_entire(obj_req)) |
1805 | opcode = CEPH_OSD_OP_WRITEFULL; | |
1806 | else | |
1807 | opcode = CEPH_OSD_OP_WRITE; | |
2169238d | 1808 | |
3da691bf | 1809 | osd_req_op_extent_init(obj_req->osd_req, which, opcode, |
43df3d35 | 1810 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1811 | rbd_osd_req_setup_data(obj_req, which++); |
2169238d | 1812 | |
3da691bf ID |
1813 | rbd_assert(which == obj_req->osd_req->r_num_ops); |
1814 | rbd_osd_req_format_write(obj_req); | |
1815 | } | |
2169238d | 1816 | |
3da691bf ID |
1817 | static int rbd_obj_setup_write(struct rbd_obj_request *obj_req) |
1818 | { | |
3da691bf ID |
1819 | unsigned int num_osd_ops, which = 0; |
1820 | int ret; | |
1821 | ||
86bd7998 ID |
1822 | /* reverse map the entire object onto the parent */ |
1823 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1824 | if (ret) | |
1825 | return ret; | |
1826 | ||
1827 | if (obj_req->num_img_extents) { | |
3da691bf ID |
1828 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1829 | num_osd_ops = 3; /* stat + setallochint + write/writefull */ | |
1830 | } else { | |
1831 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1832 | num_osd_ops = 2; /* setallochint + write/writefull */ | |
2169238d AE |
1833 | } |
1834 | ||
a162b308 | 1835 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1836 | if (!obj_req->osd_req) |
1837 | return -ENOMEM; | |
2169238d | 1838 | |
86bd7998 | 1839 | if (obj_req->num_img_extents) { |
3da691bf ID |
1840 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1841 | if (ret) | |
1842 | return ret; | |
1843 | } | |
1844 | ||
1845 | __rbd_obj_setup_write(obj_req, which); | |
1846 | return 0; | |
2169238d AE |
1847 | } |
1848 | ||
3da691bf ID |
1849 | static void __rbd_obj_setup_discard(struct rbd_obj_request *obj_req, |
1850 | unsigned int which) | |
1851 | { | |
3b434a2a JD |
1852 | u16 opcode; |
1853 | ||
3da691bf | 1854 | if (rbd_obj_is_entire(obj_req)) { |
86bd7998 | 1855 | if (obj_req->num_img_extents) { |
2bb1e56e ID |
1856 | osd_req_op_init(obj_req->osd_req, which++, |
1857 | CEPH_OSD_OP_CREATE, 0); | |
3b434a2a JD |
1858 | opcode = CEPH_OSD_OP_TRUNCATE; |
1859 | } else { | |
3da691bf ID |
1860 | osd_req_op_init(obj_req->osd_req, which++, |
1861 | CEPH_OSD_OP_DELETE, 0); | |
1862 | opcode = 0; | |
3b434a2a | 1863 | } |
3da691bf ID |
1864 | } else if (rbd_obj_is_tail(obj_req)) { |
1865 | opcode = CEPH_OSD_OP_TRUNCATE; | |
3b434a2a | 1866 | } else { |
3da691bf | 1867 | opcode = CEPH_OSD_OP_ZERO; |
3b434a2a JD |
1868 | } |
1869 | ||
3da691bf ID |
1870 | if (opcode) |
1871 | osd_req_op_extent_init(obj_req->osd_req, which++, opcode, | |
43df3d35 | 1872 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
3da691bf ID |
1873 | 0, 0); |
1874 | ||
1875 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
1876 | rbd_osd_req_format_write(obj_req); | |
3b434a2a JD |
1877 | } |
1878 | ||
3da691bf | 1879 | static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1880 | { |
3da691bf ID |
1881 | unsigned int num_osd_ops, which = 0; |
1882 | int ret; | |
37206ee5 | 1883 | |
86bd7998 ID |
1884 | /* reverse map the entire object onto the parent */ |
1885 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1886 | if (ret) | |
1887 | return ret; | |
f1a4739f | 1888 | |
3da691bf ID |
1889 | if (rbd_obj_is_entire(obj_req)) { |
1890 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2bb1e56e ID |
1891 | if (obj_req->num_img_extents) |
1892 | num_osd_ops = 2; /* create + truncate */ | |
1893 | else | |
1894 | num_osd_ops = 1; /* delete */ | |
3da691bf | 1895 | } else { |
86bd7998 | 1896 | if (obj_req->num_img_extents) { |
3da691bf ID |
1897 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1898 | num_osd_ops = 2; /* stat + truncate/zero */ | |
1899 | } else { | |
1900 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1901 | num_osd_ops = 1; /* truncate/zero */ | |
1902 | } | |
f1a4739f AE |
1903 | } |
1904 | ||
a162b308 | 1905 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1906 | if (!obj_req->osd_req) |
1907 | return -ENOMEM; | |
bf0d5f50 | 1908 | |
86bd7998 | 1909 | if (!rbd_obj_is_entire(obj_req) && obj_req->num_img_extents) { |
3da691bf ID |
1910 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1911 | if (ret) | |
1912 | return ret; | |
1913 | } | |
3b434a2a | 1914 | |
3da691bf ID |
1915 | __rbd_obj_setup_discard(obj_req, which); |
1916 | return 0; | |
1917 | } | |
9d4df01f | 1918 | |
3da691bf ID |
1919 | /* |
1920 | * For each object request in @img_req, allocate an OSD request, add | |
1921 | * individual OSD ops and prepare them for submission. The number of | |
1922 | * OSD ops depends on op_type and the overlap point (if any). | |
1923 | */ | |
1924 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
1925 | { | |
1926 | struct rbd_obj_request *obj_req; | |
1927 | int ret; | |
430c28c3 | 1928 | |
3da691bf | 1929 | for_each_obj_request(img_req, obj_req) { |
9bb0248d | 1930 | switch (img_req->op_type) { |
3da691bf ID |
1931 | case OBJ_OP_READ: |
1932 | ret = rbd_obj_setup_read(obj_req); | |
1933 | break; | |
1934 | case OBJ_OP_WRITE: | |
1935 | ret = rbd_obj_setup_write(obj_req); | |
1936 | break; | |
1937 | case OBJ_OP_DISCARD: | |
1938 | ret = rbd_obj_setup_discard(obj_req); | |
1939 | break; | |
1940 | default: | |
1941 | rbd_assert(0); | |
1942 | } | |
1943 | if (ret) | |
1944 | return ret; | |
26f887e0 ID |
1945 | |
1946 | ret = ceph_osdc_alloc_messages(obj_req->osd_req, GFP_NOIO); | |
1947 | if (ret) | |
1948 | return ret; | |
bf0d5f50 AE |
1949 | } |
1950 | ||
1951 | return 0; | |
3da691bf | 1952 | } |
bf0d5f50 | 1953 | |
5a237819 ID |
1954 | union rbd_img_fill_iter { |
1955 | struct ceph_bio_iter bio_iter; | |
1956 | struct ceph_bvec_iter bvec_iter; | |
1957 | }; | |
bf0d5f50 | 1958 | |
5a237819 ID |
1959 | struct rbd_img_fill_ctx { |
1960 | enum obj_request_type pos_type; | |
1961 | union rbd_img_fill_iter *pos; | |
1962 | union rbd_img_fill_iter iter; | |
1963 | ceph_object_extent_fn_t set_pos_fn; | |
afb97888 ID |
1964 | ceph_object_extent_fn_t count_fn; |
1965 | ceph_object_extent_fn_t copy_fn; | |
5a237819 | 1966 | }; |
bf0d5f50 | 1967 | |
5a237819 | 1968 | static struct ceph_object_extent *alloc_object_extent(void *arg) |
0eefd470 | 1969 | { |
5a237819 ID |
1970 | struct rbd_img_request *img_req = arg; |
1971 | struct rbd_obj_request *obj_req; | |
0eefd470 | 1972 | |
5a237819 ID |
1973 | obj_req = rbd_obj_request_create(); |
1974 | if (!obj_req) | |
1975 | return NULL; | |
2761713d | 1976 | |
5a237819 ID |
1977 | rbd_img_obj_request_add(img_req, obj_req); |
1978 | return &obj_req->ex; | |
1979 | } | |
0eefd470 | 1980 | |
afb97888 ID |
1981 | /* |
1982 | * While su != os && sc == 1 is technically not fancy (it's the same | |
1983 | * layout as su == os && sc == 1), we can't use the nocopy path for it | |
1984 | * because ->set_pos_fn() should be called only once per object. | |
1985 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so | |
1986 | * treat su != os && sc == 1 as fancy. | |
1987 | */ | |
1988 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) | |
1989 | { | |
1990 | return l->stripe_unit != l->object_size; | |
1991 | } | |
0eefd470 | 1992 | |
afb97888 ID |
1993 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
1994 | struct ceph_file_extent *img_extents, | |
1995 | u32 num_img_extents, | |
1996 | struct rbd_img_fill_ctx *fctx) | |
1997 | { | |
1998 | u32 i; | |
1999 | int ret; | |
2000 | ||
2001 | img_req->data_type = fctx->pos_type; | |
0eefd470 AE |
2002 | |
2003 | /* | |
afb97888 ID |
2004 | * Create object requests and set each object request's starting |
2005 | * position in the provided bio (list) or bio_vec array. | |
0eefd470 | 2006 | */ |
afb97888 ID |
2007 | fctx->iter = *fctx->pos; |
2008 | for (i = 0; i < num_img_extents; i++) { | |
2009 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, | |
2010 | img_extents[i].fe_off, | |
2011 | img_extents[i].fe_len, | |
2012 | &img_req->object_extents, | |
2013 | alloc_object_extent, img_req, | |
2014 | fctx->set_pos_fn, &fctx->iter); | |
2015 | if (ret) | |
2016 | return ret; | |
2017 | } | |
0eefd470 | 2018 | |
afb97888 | 2019 | return __rbd_img_fill_request(img_req); |
0eefd470 AE |
2020 | } |
2021 | ||
5a237819 ID |
2022 | /* |
2023 | * Map a list of image extents to a list of object extents, create the | |
2024 | * corresponding object requests (normally each to a different object, | |
2025 | * but not always) and add them to @img_req. For each object request, | |
afb97888 | 2026 | * set up its data descriptor to point to the corresponding chunk(s) of |
5a237819 ID |
2027 | * @fctx->pos data buffer. |
2028 | * | |
afb97888 ID |
2029 | * Because ceph_file_to_extents() will merge adjacent object extents |
2030 | * together, each object request's data descriptor may point to multiple | |
2031 | * different chunks of @fctx->pos data buffer. | |
2032 | * | |
5a237819 ID |
2033 | * @fctx->pos data buffer is assumed to be large enough. |
2034 | */ | |
2035 | static int rbd_img_fill_request(struct rbd_img_request *img_req, | |
2036 | struct ceph_file_extent *img_extents, | |
2037 | u32 num_img_extents, | |
2038 | struct rbd_img_fill_ctx *fctx) | |
3d7efd18 | 2039 | { |
afb97888 ID |
2040 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
2041 | struct rbd_obj_request *obj_req; | |
5a237819 ID |
2042 | u32 i; |
2043 | int ret; | |
2044 | ||
afb97888 ID |
2045 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
2046 | !rbd_layout_is_fancy(&rbd_dev->layout)) | |
2047 | return rbd_img_fill_request_nocopy(img_req, img_extents, | |
2048 | num_img_extents, fctx); | |
3d7efd18 | 2049 | |
afb97888 | 2050 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
0eefd470 | 2051 | |
bbea1c1a | 2052 | /* |
afb97888 ID |
2053 | * Create object requests and determine ->bvec_count for each object |
2054 | * request. Note that ->bvec_count sum over all object requests may | |
2055 | * be greater than the number of bio_vecs in the provided bio (list) | |
2056 | * or bio_vec array because when mapped, those bio_vecs can straddle | |
2057 | * stripe unit boundaries. | |
bbea1c1a | 2058 | */ |
5a237819 ID |
2059 | fctx->iter = *fctx->pos; |
2060 | for (i = 0; i < num_img_extents; i++) { | |
afb97888 | 2061 | ret = ceph_file_to_extents(&rbd_dev->layout, |
5a237819 ID |
2062 | img_extents[i].fe_off, |
2063 | img_extents[i].fe_len, | |
2064 | &img_req->object_extents, | |
2065 | alloc_object_extent, img_req, | |
afb97888 ID |
2066 | fctx->count_fn, &fctx->iter); |
2067 | if (ret) | |
2068 | return ret; | |
bbea1c1a | 2069 | } |
0eefd470 | 2070 | |
afb97888 ID |
2071 | for_each_obj_request(img_req, obj_req) { |
2072 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, | |
2073 | sizeof(*obj_req->bvec_pos.bvecs), | |
2074 | GFP_NOIO); | |
2075 | if (!obj_req->bvec_pos.bvecs) | |
2076 | return -ENOMEM; | |
2077 | } | |
0eefd470 | 2078 | |
8785b1d4 | 2079 | /* |
afb97888 ID |
2080 | * Fill in each object request's private bio_vec array, splitting and |
2081 | * rearranging the provided bio_vecs in stripe unit chunks as needed. | |
8785b1d4 | 2082 | */ |
afb97888 ID |
2083 | fctx->iter = *fctx->pos; |
2084 | for (i = 0; i < num_img_extents; i++) { | |
2085 | ret = ceph_iterate_extents(&rbd_dev->layout, | |
2086 | img_extents[i].fe_off, | |
2087 | img_extents[i].fe_len, | |
2088 | &img_req->object_extents, | |
2089 | fctx->copy_fn, &fctx->iter); | |
5a237819 ID |
2090 | if (ret) |
2091 | return ret; | |
2092 | } | |
3d7efd18 | 2093 | |
5a237819 ID |
2094 | return __rbd_img_fill_request(img_req); |
2095 | } | |
2096 | ||
2097 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, | |
2098 | u64 off, u64 len) | |
2099 | { | |
2100 | struct ceph_file_extent ex = { off, len }; | |
2101 | union rbd_img_fill_iter dummy; | |
2102 | struct rbd_img_fill_ctx fctx = { | |
2103 | .pos_type = OBJ_REQUEST_NODATA, | |
2104 | .pos = &dummy, | |
2105 | }; | |
2106 | ||
2107 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); | |
2108 | } | |
2109 | ||
2110 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2111 | { | |
2112 | struct rbd_obj_request *obj_req = | |
2113 | container_of(ex, struct rbd_obj_request, ex); | |
2114 | struct ceph_bio_iter *it = arg; | |
3d7efd18 | 2115 | |
5a237819 ID |
2116 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2117 | obj_req->bio_pos = *it; | |
2118 | ceph_bio_iter_advance(it, bytes); | |
2119 | } | |
3d7efd18 | 2120 | |
afb97888 ID |
2121 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2122 | { | |
2123 | struct rbd_obj_request *obj_req = | |
2124 | container_of(ex, struct rbd_obj_request, ex); | |
2125 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2126 | |
afb97888 ID |
2127 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2128 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2129 | obj_req->bvec_count++; | |
2130 | })); | |
0eefd470 | 2131 | |
afb97888 | 2132 | } |
0eefd470 | 2133 | |
afb97888 ID |
2134 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2135 | { | |
2136 | struct rbd_obj_request *obj_req = | |
2137 | container_of(ex, struct rbd_obj_request, ex); | |
2138 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2139 | |
afb97888 ID |
2140 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2141 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2142 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2143 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2144 | })); | |
3d7efd18 AE |
2145 | } |
2146 | ||
5a237819 ID |
2147 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2148 | struct ceph_file_extent *img_extents, | |
2149 | u32 num_img_extents, | |
2150 | struct ceph_bio_iter *bio_pos) | |
2151 | { | |
2152 | struct rbd_img_fill_ctx fctx = { | |
2153 | .pos_type = OBJ_REQUEST_BIO, | |
2154 | .pos = (union rbd_img_fill_iter *)bio_pos, | |
2155 | .set_pos_fn = set_bio_pos, | |
afb97888 ID |
2156 | .count_fn = count_bio_bvecs, |
2157 | .copy_fn = copy_bio_bvecs, | |
5a237819 | 2158 | }; |
3d7efd18 | 2159 | |
5a237819 ID |
2160 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2161 | &fctx); | |
2162 | } | |
3d7efd18 | 2163 | |
5a237819 ID |
2164 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2165 | u64 off, u64 len, struct bio *bio) | |
2166 | { | |
2167 | struct ceph_file_extent ex = { off, len }; | |
2168 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; | |
3d7efd18 | 2169 | |
5a237819 ID |
2170 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
2171 | } | |
a9e8ba2c | 2172 | |
5a237819 ID |
2173 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2174 | { | |
2175 | struct rbd_obj_request *obj_req = | |
2176 | container_of(ex, struct rbd_obj_request, ex); | |
2177 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2178 | |
5a237819 ID |
2179 | obj_req->bvec_pos = *it; |
2180 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); | |
2181 | ceph_bvec_iter_advance(it, bytes); | |
2182 | } | |
3d7efd18 | 2183 | |
afb97888 ID |
2184 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2185 | { | |
2186 | struct rbd_obj_request *obj_req = | |
2187 | container_of(ex, struct rbd_obj_request, ex); | |
2188 | struct ceph_bvec_iter *it = arg; | |
058aa991 | 2189 | |
afb97888 ID |
2190 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2191 | obj_req->bvec_count++; | |
2192 | })); | |
2193 | } | |
058aa991 | 2194 | |
afb97888 ID |
2195 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2196 | { | |
2197 | struct rbd_obj_request *obj_req = | |
2198 | container_of(ex, struct rbd_obj_request, ex); | |
2199 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2200 | |
afb97888 ID |
2201 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2202 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2203 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2204 | })); | |
3d7efd18 AE |
2205 | } |
2206 | ||
5a237819 ID |
2207 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2208 | struct ceph_file_extent *img_extents, | |
2209 | u32 num_img_extents, | |
2210 | struct ceph_bvec_iter *bvec_pos) | |
c5b5ef6c | 2211 | { |
5a237819 ID |
2212 | struct rbd_img_fill_ctx fctx = { |
2213 | .pos_type = OBJ_REQUEST_BVECS, | |
2214 | .pos = (union rbd_img_fill_iter *)bvec_pos, | |
2215 | .set_pos_fn = set_bvec_pos, | |
afb97888 ID |
2216 | .count_fn = count_bvecs, |
2217 | .copy_fn = copy_bvecs, | |
5a237819 | 2218 | }; |
c5b5ef6c | 2219 | |
5a237819 ID |
2220 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2221 | &fctx); | |
2222 | } | |
c5b5ef6c | 2223 | |
5a237819 ID |
2224 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2225 | struct ceph_file_extent *img_extents, | |
2226 | u32 num_img_extents, | |
2227 | struct bio_vec *bvecs) | |
2228 | { | |
2229 | struct ceph_bvec_iter it = { | |
2230 | .bvecs = bvecs, | |
2231 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, | |
2232 | num_img_extents) }, | |
2233 | }; | |
c5b5ef6c | 2234 | |
5a237819 ID |
2235 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
2236 | &it); | |
2237 | } | |
c5b5ef6c | 2238 | |
efbd1a11 | 2239 | static void rbd_img_request_submit(struct rbd_img_request *img_request) |
bf0d5f50 | 2240 | { |
bf0d5f50 | 2241 | struct rbd_obj_request *obj_request; |
c5b5ef6c | 2242 | |
37206ee5 | 2243 | dout("%s: img %p\n", __func__, img_request); |
c2e82414 | 2244 | |
663ae2cc | 2245 | rbd_img_request_get(img_request); |
efbd1a11 | 2246 | for_each_obj_request(img_request, obj_request) |
3da691bf | 2247 | rbd_obj_request_submit(obj_request); |
c2e82414 | 2248 | |
663ae2cc | 2249 | rbd_img_request_put(img_request); |
c5b5ef6c AE |
2250 | } |
2251 | ||
86bd7998 | 2252 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
c5b5ef6c | 2253 | { |
3da691bf ID |
2254 | struct rbd_img_request *img_req = obj_req->img_request; |
2255 | struct rbd_img_request *child_img_req; | |
c5b5ef6c AE |
2256 | int ret; |
2257 | ||
e93aca0a ID |
2258 | child_img_req = rbd_img_request_create(img_req->rbd_dev->parent, |
2259 | OBJ_OP_READ, NULL); | |
3da691bf | 2260 | if (!child_img_req) |
710214e3 ID |
2261 | return -ENOMEM; |
2262 | ||
e93aca0a ID |
2263 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
2264 | child_img_req->obj_request = obj_req; | |
a90bb0c1 | 2265 | |
3da691bf | 2266 | if (!rbd_img_is_write(img_req)) { |
ecc633ca | 2267 | switch (img_req->data_type) { |
3da691bf | 2268 | case OBJ_REQUEST_BIO: |
5a237819 ID |
2269 | ret = __rbd_img_fill_from_bio(child_img_req, |
2270 | obj_req->img_extents, | |
2271 | obj_req->num_img_extents, | |
2272 | &obj_req->bio_pos); | |
3da691bf ID |
2273 | break; |
2274 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2275 | case OBJ_REQUEST_OWN_BVECS: |
5a237819 ID |
2276 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
2277 | obj_req->img_extents, | |
2278 | obj_req->num_img_extents, | |
2279 | &obj_req->bvec_pos); | |
3da691bf ID |
2280 | break; |
2281 | default: | |
2282 | rbd_assert(0); | |
2283 | } | |
2284 | } else { | |
5a237819 ID |
2285 | ret = rbd_img_fill_from_bvecs(child_img_req, |
2286 | obj_req->img_extents, | |
2287 | obj_req->num_img_extents, | |
2288 | obj_req->copyup_bvecs); | |
3da691bf ID |
2289 | } |
2290 | if (ret) { | |
2291 | rbd_img_request_put(child_img_req); | |
2292 | return ret; | |
2293 | } | |
2294 | ||
2295 | rbd_img_request_submit(child_img_req); | |
2296 | return 0; | |
2297 | } | |
2298 | ||
2299 | static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req) | |
2300 | { | |
2301 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2302 | int ret; | |
2303 | ||
2304 | if (obj_req->result == -ENOENT && | |
86bd7998 ID |
2305 | rbd_dev->parent_overlap && !obj_req->tried_parent) { |
2306 | /* reverse map this object extent onto the parent */ | |
2307 | ret = rbd_obj_calc_img_extents(obj_req, false); | |
3da691bf ID |
2308 | if (ret) { |
2309 | obj_req->result = ret; | |
2310 | return true; | |
2311 | } | |
86bd7998 ID |
2312 | |
2313 | if (obj_req->num_img_extents) { | |
2314 | obj_req->tried_parent = true; | |
2315 | ret = rbd_obj_read_from_parent(obj_req); | |
2316 | if (ret) { | |
2317 | obj_req->result = ret; | |
2318 | return true; | |
2319 | } | |
2320 | return false; | |
2321 | } | |
710214e3 ID |
2322 | } |
2323 | ||
c5b5ef6c | 2324 | /* |
3da691bf ID |
2325 | * -ENOENT means a hole in the image -- zero-fill the entire |
2326 | * length of the request. A short read also implies zero-fill | |
2327 | * to the end of the request. In both cases we update xferred | |
2328 | * count to indicate the whole request was satisfied. | |
c5b5ef6c | 2329 | */ |
3da691bf | 2330 | if (obj_req->result == -ENOENT || |
43df3d35 | 2331 | (!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) { |
3da691bf ID |
2332 | rbd_assert(!obj_req->xferred || !obj_req->result); |
2333 | rbd_obj_zero_range(obj_req, obj_req->xferred, | |
43df3d35 | 2334 | obj_req->ex.oe_len - obj_req->xferred); |
3da691bf | 2335 | obj_req->result = 0; |
43df3d35 | 2336 | obj_req->xferred = obj_req->ex.oe_len; |
710214e3 | 2337 | } |
c5b5ef6c | 2338 | |
3da691bf ID |
2339 | return true; |
2340 | } | |
c5b5ef6c | 2341 | |
3da691bf ID |
2342 | /* |
2343 | * copyup_bvecs pages are never highmem pages | |
2344 | */ | |
2345 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
2346 | { | |
2347 | struct ceph_bvec_iter it = { | |
2348 | .bvecs = bvecs, | |
2349 | .iter = { .bi_size = bytes }, | |
2350 | }; | |
c5b5ef6c | 2351 | |
3da691bf ID |
2352 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
2353 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
2354 | bv.bv_len)) | |
2355 | return false; | |
2356 | })); | |
2357 | return true; | |
c5b5ef6c AE |
2358 | } |
2359 | ||
3da691bf | 2360 | static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes) |
b454e36d | 2361 | { |
3da691bf | 2362 | unsigned int num_osd_ops = obj_req->osd_req->r_num_ops; |
fe943d50 | 2363 | int ret; |
70d045f6 | 2364 | |
3da691bf ID |
2365 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
2366 | rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT); | |
2367 | rbd_osd_req_destroy(obj_req->osd_req); | |
70d045f6 | 2368 | |
b454e36d | 2369 | /* |
3da691bf ID |
2370 | * Create a copyup request with the same number of OSD ops as |
2371 | * the original request. The original request was stat + op(s), | |
2372 | * the new copyup request will be copyup + the same op(s). | |
b454e36d | 2373 | */ |
a162b308 | 2374 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2375 | if (!obj_req->osd_req) |
2376 | return -ENOMEM; | |
b454e36d | 2377 | |
24639ce5 | 2378 | ret = osd_req_op_cls_init(obj_req->osd_req, 0, "rbd", "copyup"); |
fe943d50 CX |
2379 | if (ret) |
2380 | return ret; | |
2381 | ||
c622d226 | 2382 | /* |
3da691bf ID |
2383 | * Only send non-zero copyup data to save some I/O and network |
2384 | * bandwidth -- zero copyup data is equivalent to the object not | |
2385 | * existing. | |
c622d226 | 2386 | */ |
3da691bf ID |
2387 | if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) { |
2388 | dout("%s obj_req %p detected zeroes\n", __func__, obj_req); | |
2389 | bytes = 0; | |
2390 | } | |
3da691bf | 2391 | osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0, |
0010f705 ID |
2392 | obj_req->copyup_bvecs, |
2393 | obj_req->copyup_bvec_count, | |
2394 | bytes); | |
3da691bf | 2395 | |
9bb0248d | 2396 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2397 | case OBJ_OP_WRITE: |
2398 | __rbd_obj_setup_write(obj_req, 1); | |
2399 | break; | |
2400 | case OBJ_OP_DISCARD: | |
2401 | rbd_assert(!rbd_obj_is_entire(obj_req)); | |
2402 | __rbd_obj_setup_discard(obj_req, 1); | |
2403 | break; | |
2404 | default: | |
2405 | rbd_assert(0); | |
2406 | } | |
70d045f6 | 2407 | |
26f887e0 ID |
2408 | ret = ceph_osdc_alloc_messages(obj_req->osd_req, GFP_NOIO); |
2409 | if (ret) | |
2410 | return ret; | |
2411 | ||
3da691bf | 2412 | rbd_obj_request_submit(obj_req); |
3da691bf | 2413 | return 0; |
70d045f6 ID |
2414 | } |
2415 | ||
7e07efb1 | 2416 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
70d045f6 | 2417 | { |
7e07efb1 | 2418 | u32 i; |
b454e36d | 2419 | |
7e07efb1 ID |
2420 | rbd_assert(!obj_req->copyup_bvecs); |
2421 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
2422 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
2423 | sizeof(*obj_req->copyup_bvecs), | |
2424 | GFP_NOIO); | |
2425 | if (!obj_req->copyup_bvecs) | |
2426 | return -ENOMEM; | |
b454e36d | 2427 | |
7e07efb1 ID |
2428 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
2429 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
2430 | ||
2431 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
2432 | if (!obj_req->copyup_bvecs[i].bv_page) | |
2433 | return -ENOMEM; | |
3d7efd18 | 2434 | |
7e07efb1 ID |
2435 | obj_req->copyup_bvecs[i].bv_offset = 0; |
2436 | obj_req->copyup_bvecs[i].bv_len = len; | |
2437 | obj_overlap -= len; | |
2438 | } | |
b454e36d | 2439 | |
7e07efb1 ID |
2440 | rbd_assert(!obj_overlap); |
2441 | return 0; | |
b454e36d AE |
2442 | } |
2443 | ||
3da691bf | 2444 | static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) |
bf0d5f50 | 2445 | { |
3da691bf | 2446 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
3da691bf | 2447 | int ret; |
bf0d5f50 | 2448 | |
86bd7998 ID |
2449 | rbd_assert(obj_req->num_img_extents); |
2450 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
2451 | rbd_dev->parent_overlap); | |
2452 | if (!obj_req->num_img_extents) { | |
3da691bf ID |
2453 | /* |
2454 | * The overlap has become 0 (most likely because the | |
2455 | * image has been flattened). Use rbd_obj_issue_copyup() | |
2456 | * to re-submit the original write request -- the copyup | |
2457 | * operation itself will be a no-op, since someone must | |
2458 | * have populated the child object while we weren't | |
2459 | * looking. Move to WRITE_FLAT state as we'll be done | |
2460 | * with the operation once the null copyup completes. | |
2461 | */ | |
2462 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2463 | return rbd_obj_issue_copyup(obj_req, 0); | |
bf0d5f50 AE |
2464 | } |
2465 | ||
86bd7998 | 2466 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
3da691bf ID |
2467 | if (ret) |
2468 | return ret; | |
2469 | ||
2470 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; | |
86bd7998 | 2471 | return rbd_obj_read_from_parent(obj_req); |
bf0d5f50 | 2472 | } |
8b3e1a56 | 2473 | |
3da691bf | 2474 | static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req) |
8b3e1a56 | 2475 | { |
3da691bf | 2476 | int ret; |
8b3e1a56 | 2477 | |
3da691bf ID |
2478 | again: |
2479 | switch (obj_req->write_state) { | |
2480 | case RBD_OBJ_WRITE_GUARD: | |
2481 | rbd_assert(!obj_req->xferred); | |
2482 | if (obj_req->result == -ENOENT) { | |
2483 | /* | |
2484 | * The target object doesn't exist. Read the data for | |
2485 | * the entire target object up to the overlap point (if | |
2486 | * any) from the parent, so we can use it for a copyup. | |
2487 | */ | |
2488 | ret = rbd_obj_handle_write_guard(obj_req); | |
2489 | if (ret) { | |
2490 | obj_req->result = ret; | |
2491 | return true; | |
2492 | } | |
2493 | return false; | |
2494 | } | |
2495 | /* fall through */ | |
2496 | case RBD_OBJ_WRITE_FLAT: | |
2497 | if (!obj_req->result) | |
2498 | /* | |
2499 | * There is no such thing as a successful short | |
2500 | * write -- indicate the whole request was satisfied. | |
2501 | */ | |
43df3d35 | 2502 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2503 | return true; |
2504 | case RBD_OBJ_WRITE_COPYUP: | |
2505 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2506 | if (obj_req->result) | |
2507 | goto again; | |
8b3e1a56 | 2508 | |
3da691bf ID |
2509 | rbd_assert(obj_req->xferred); |
2510 | ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred); | |
2511 | if (ret) { | |
2512 | obj_req->result = ret; | |
2513 | return true; | |
2514 | } | |
2515 | return false; | |
2516 | default: | |
c6244b3b | 2517 | BUG(); |
3da691bf ID |
2518 | } |
2519 | } | |
02c74fba | 2520 | |
3da691bf ID |
2521 | /* |
2522 | * Returns true if @obj_req is completed, or false otherwise. | |
2523 | */ | |
2524 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2525 | { | |
9bb0248d | 2526 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2527 | case OBJ_OP_READ: |
2528 | return rbd_obj_handle_read(obj_req); | |
2529 | case OBJ_OP_WRITE: | |
2530 | return rbd_obj_handle_write(obj_req); | |
2531 | case OBJ_OP_DISCARD: | |
2532 | if (rbd_obj_handle_write(obj_req)) { | |
2533 | /* | |
2534 | * Hide -ENOENT from delete/truncate/zero -- discarding | |
2535 | * a non-existent object is not a problem. | |
2536 | */ | |
2537 | if (obj_req->result == -ENOENT) { | |
2538 | obj_req->result = 0; | |
43df3d35 | 2539 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2540 | } |
2541 | return true; | |
2542 | } | |
2543 | return false; | |
2544 | default: | |
c6244b3b | 2545 | BUG(); |
3da691bf ID |
2546 | } |
2547 | } | |
02c74fba | 2548 | |
7114edac ID |
2549 | static void rbd_obj_end_request(struct rbd_obj_request *obj_req) |
2550 | { | |
2551 | struct rbd_img_request *img_req = obj_req->img_request; | |
2552 | ||
2553 | rbd_assert((!obj_req->result && | |
43df3d35 | 2554 | obj_req->xferred == obj_req->ex.oe_len) || |
7114edac ID |
2555 | (obj_req->result < 0 && !obj_req->xferred)); |
2556 | if (!obj_req->result) { | |
2557 | img_req->xferred += obj_req->xferred; | |
980917fc | 2558 | return; |
02c74fba | 2559 | } |
a9e8ba2c | 2560 | |
7114edac ID |
2561 | rbd_warn(img_req->rbd_dev, |
2562 | "%s at objno %llu %llu~%llu result %d xferred %llu", | |
43df3d35 ID |
2563 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
2564 | obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result, | |
7114edac ID |
2565 | obj_req->xferred); |
2566 | if (!img_req->result) { | |
2567 | img_req->result = obj_req->result; | |
2568 | img_req->xferred = 0; | |
2569 | } | |
2570 | } | |
a9e8ba2c | 2571 | |
3da691bf ID |
2572 | static void rbd_img_end_child_request(struct rbd_img_request *img_req) |
2573 | { | |
2574 | struct rbd_obj_request *obj_req = img_req->obj_request; | |
a9e8ba2c | 2575 | |
3da691bf | 2576 | rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags)); |
86bd7998 ID |
2577 | rbd_assert((!img_req->result && |
2578 | img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) || | |
2579 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2580 | |
3da691bf ID |
2581 | obj_req->result = img_req->result; |
2582 | obj_req->xferred = img_req->xferred; | |
2583 | rbd_img_request_put(img_req); | |
8b3e1a56 AE |
2584 | } |
2585 | ||
7114edac | 2586 | static void rbd_img_end_request(struct rbd_img_request *img_req) |
8b3e1a56 | 2587 | { |
7114edac ID |
2588 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); |
2589 | rbd_assert((!img_req->result && | |
2590 | img_req->xferred == blk_rq_bytes(img_req->rq)) || | |
2591 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2592 | |
7114edac ID |
2593 | blk_mq_end_request(img_req->rq, |
2594 | errno_to_blk_status(img_req->result)); | |
2595 | rbd_img_request_put(img_req); | |
3da691bf | 2596 | } |
8b3e1a56 | 2597 | |
3da691bf ID |
2598 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req) |
2599 | { | |
7114edac | 2600 | struct rbd_img_request *img_req; |
8b3e1a56 | 2601 | |
7114edac | 2602 | again: |
3da691bf ID |
2603 | if (!__rbd_obj_handle_request(obj_req)) |
2604 | return; | |
8b3e1a56 | 2605 | |
7114edac ID |
2606 | img_req = obj_req->img_request; |
2607 | spin_lock(&img_req->completion_lock); | |
2608 | rbd_obj_end_request(obj_req); | |
2609 | rbd_assert(img_req->pending_count); | |
2610 | if (--img_req->pending_count) { | |
2611 | spin_unlock(&img_req->completion_lock); | |
2612 | return; | |
2613 | } | |
8b3e1a56 | 2614 | |
7114edac ID |
2615 | spin_unlock(&img_req->completion_lock); |
2616 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { | |
2617 | obj_req = img_req->obj_request; | |
2618 | rbd_img_end_child_request(img_req); | |
2619 | goto again; | |
2620 | } | |
2621 | rbd_img_end_request(img_req); | |
8b3e1a56 | 2622 | } |
bf0d5f50 | 2623 | |
ed95b21a | 2624 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 2625 | |
ed95b21a ID |
2626 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
2627 | const struct rbd_client_id *rhs) | |
2628 | { | |
2629 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
2630 | } | |
2631 | ||
2632 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
2633 | { | |
2634 | struct rbd_client_id cid; | |
2635 | ||
2636 | mutex_lock(&rbd_dev->watch_mutex); | |
2637 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
2638 | cid.handle = rbd_dev->watch_cookie; | |
2639 | mutex_unlock(&rbd_dev->watch_mutex); | |
2640 | return cid; | |
2641 | } | |
2642 | ||
2643 | /* | |
2644 | * lock_rwsem must be held for write | |
2645 | */ | |
2646 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
2647 | const struct rbd_client_id *cid) | |
2648 | { | |
2649 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
2650 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
2651 | cid->gid, cid->handle); | |
2652 | rbd_dev->owner_cid = *cid; /* struct */ | |
2653 | } | |
2654 | ||
2655 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
2656 | { | |
2657 | mutex_lock(&rbd_dev->watch_mutex); | |
2658 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
2659 | mutex_unlock(&rbd_dev->watch_mutex); | |
2660 | } | |
2661 | ||
edd8ca80 FM |
2662 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
2663 | { | |
2664 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
2665 | ||
2666 | strcpy(rbd_dev->lock_cookie, cookie); | |
2667 | rbd_set_owner_cid(rbd_dev, &cid); | |
2668 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
2669 | } | |
2670 | ||
ed95b21a ID |
2671 | /* |
2672 | * lock_rwsem must be held for write | |
2673 | */ | |
2674 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 2675 | { |
922dab61 | 2676 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 2677 | char cookie[32]; |
e627db08 | 2678 | int ret; |
b8d70035 | 2679 | |
cbbfb0ff ID |
2680 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
2681 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 2682 | |
ed95b21a ID |
2683 | format_lock_cookie(rbd_dev, cookie); |
2684 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
2685 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
2686 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 2687 | if (ret) |
ed95b21a | 2688 | return ret; |
b8d70035 | 2689 | |
ed95b21a | 2690 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 2691 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 2692 | return 0; |
b8d70035 AE |
2693 | } |
2694 | ||
ed95b21a ID |
2695 | /* |
2696 | * lock_rwsem must be held for write | |
2697 | */ | |
bbead745 | 2698 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 2699 | { |
922dab61 | 2700 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
2701 | int ret; |
2702 | ||
cbbfb0ff ID |
2703 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
2704 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 2705 | |
ed95b21a | 2706 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 2707 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
2708 | if (ret && ret != -ENOENT) |
2709 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 2710 | |
bbead745 ID |
2711 | /* treat errors as the image is unlocked */ |
2712 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 2713 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
2714 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
2715 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
2716 | } |
2717 | ||
ed95b21a ID |
2718 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2719 | enum rbd_notify_op notify_op, | |
2720 | struct page ***preply_pages, | |
2721 | size_t *preply_len) | |
9969ebc5 AE |
2722 | { |
2723 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a | 2724 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
08a79102 KS |
2725 | char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
2726 | int buf_size = sizeof(buf); | |
ed95b21a | 2727 | void *p = buf; |
9969ebc5 | 2728 | |
ed95b21a | 2729 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 2730 | |
ed95b21a ID |
2731 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
2732 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
2733 | ceph_encode_32(&p, notify_op); | |
2734 | ceph_encode_64(&p, cid.gid); | |
2735 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 2736 | |
ed95b21a ID |
2737 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
2738 | &rbd_dev->header_oloc, buf, buf_size, | |
2739 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
2740 | } |
2741 | ||
ed95b21a ID |
2742 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2743 | enum rbd_notify_op notify_op) | |
b30a01f2 | 2744 | { |
ed95b21a ID |
2745 | struct page **reply_pages; |
2746 | size_t reply_len; | |
b30a01f2 | 2747 | |
ed95b21a ID |
2748 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
2749 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2750 | } | |
b30a01f2 | 2751 | |
ed95b21a ID |
2752 | static void rbd_notify_acquired_lock(struct work_struct *work) |
2753 | { | |
2754 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
2755 | acquired_lock_work); | |
76756a51 | 2756 | |
ed95b21a | 2757 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
2758 | } |
2759 | ||
ed95b21a | 2760 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 2761 | { |
ed95b21a ID |
2762 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
2763 | released_lock_work); | |
811c6688 | 2764 | |
ed95b21a | 2765 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
2766 | } |
2767 | ||
ed95b21a | 2768 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 2769 | { |
ed95b21a ID |
2770 | struct page **reply_pages; |
2771 | size_t reply_len; | |
2772 | bool lock_owner_responded = false; | |
36be9a76 AE |
2773 | int ret; |
2774 | ||
ed95b21a | 2775 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 2776 | |
ed95b21a ID |
2777 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
2778 | &reply_pages, &reply_len); | |
2779 | if (ret && ret != -ETIMEDOUT) { | |
2780 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 2781 | goto out; |
ed95b21a | 2782 | } |
36be9a76 | 2783 | |
ed95b21a ID |
2784 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
2785 | void *p = page_address(reply_pages[0]); | |
2786 | void *const end = p + reply_len; | |
2787 | u32 n; | |
36be9a76 | 2788 | |
ed95b21a ID |
2789 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
2790 | while (n--) { | |
2791 | u8 struct_v; | |
2792 | u32 len; | |
36be9a76 | 2793 | |
ed95b21a ID |
2794 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
2795 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 2796 | |
ed95b21a ID |
2797 | ceph_decode_32_safe(&p, end, len, e_inval); |
2798 | if (!len) | |
2799 | continue; | |
2800 | ||
2801 | if (lock_owner_responded) { | |
2802 | rbd_warn(rbd_dev, | |
2803 | "duplicate lock owners detected"); | |
2804 | ret = -EIO; | |
2805 | goto out; | |
2806 | } | |
2807 | ||
2808 | lock_owner_responded = true; | |
2809 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
2810 | &struct_v, &len); | |
2811 | if (ret) { | |
2812 | rbd_warn(rbd_dev, | |
2813 | "failed to decode ResponseMessage: %d", | |
2814 | ret); | |
2815 | goto e_inval; | |
2816 | } | |
2817 | ||
2818 | ret = ceph_decode_32(&p); | |
2819 | } | |
2820 | } | |
2821 | ||
2822 | if (!lock_owner_responded) { | |
2823 | rbd_warn(rbd_dev, "no lock owners detected"); | |
2824 | ret = -ETIMEDOUT; | |
2825 | } | |
2826 | ||
2827 | out: | |
2828 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2829 | return ret; | |
2830 | ||
2831 | e_inval: | |
2832 | ret = -EINVAL; | |
2833 | goto out; | |
2834 | } | |
2835 | ||
2836 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
2837 | { | |
2838 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
2839 | ||
2840 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
2841 | if (wake_all) | |
2842 | wake_up_all(&rbd_dev->lock_waitq); | |
2843 | else | |
2844 | wake_up(&rbd_dev->lock_waitq); | |
2845 | } | |
2846 | ||
2847 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
2848 | struct ceph_locker **lockers, u32 *num_lockers) | |
2849 | { | |
2850 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2851 | u8 lock_type; | |
2852 | char *lock_tag; | |
2853 | int ret; | |
2854 | ||
2855 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2856 | ||
2857 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
2858 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2859 | &lock_type, &lock_tag, lockers, num_lockers); | |
2860 | if (ret) | |
2861 | return ret; | |
2862 | ||
2863 | if (*num_lockers == 0) { | |
2864 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
2865 | goto out; | |
2866 | } | |
2867 | ||
2868 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
2869 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
2870 | lock_tag); | |
2871 | ret = -EBUSY; | |
2872 | goto out; | |
2873 | } | |
2874 | ||
2875 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
2876 | rbd_warn(rbd_dev, "shared lock type detected"); | |
2877 | ret = -EBUSY; | |
2878 | goto out; | |
2879 | } | |
2880 | ||
2881 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
2882 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
2883 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
2884 | (*lockers)[0].id.cookie); | |
2885 | ret = -EBUSY; | |
2886 | goto out; | |
2887 | } | |
2888 | ||
2889 | out: | |
2890 | kfree(lock_tag); | |
2891 | return ret; | |
2892 | } | |
2893 | ||
2894 | static int find_watcher(struct rbd_device *rbd_dev, | |
2895 | const struct ceph_locker *locker) | |
2896 | { | |
2897 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2898 | struct ceph_watch_item *watchers; | |
2899 | u32 num_watchers; | |
2900 | u64 cookie; | |
2901 | int i; | |
2902 | int ret; | |
2903 | ||
2904 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
2905 | &rbd_dev->header_oloc, &watchers, | |
2906 | &num_watchers); | |
2907 | if (ret) | |
2908 | return ret; | |
2909 | ||
2910 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
2911 | for (i = 0; i < num_watchers; i++) { | |
2912 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
2913 | sizeof(locker->info.addr)) && | |
2914 | watchers[i].cookie == cookie) { | |
2915 | struct rbd_client_id cid = { | |
2916 | .gid = le64_to_cpu(watchers[i].name.num), | |
2917 | .handle = cookie, | |
2918 | }; | |
2919 | ||
2920 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
2921 | rbd_dev, cid.gid, cid.handle); | |
2922 | rbd_set_owner_cid(rbd_dev, &cid); | |
2923 | ret = 1; | |
2924 | goto out; | |
2925 | } | |
2926 | } | |
2927 | ||
2928 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
2929 | ret = 0; | |
2930 | out: | |
2931 | kfree(watchers); | |
2932 | return ret; | |
2933 | } | |
2934 | ||
2935 | /* | |
2936 | * lock_rwsem must be held for write | |
2937 | */ | |
2938 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
2939 | { | |
2940 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2941 | struct ceph_locker *lockers; | |
2942 | u32 num_lockers; | |
2943 | int ret; | |
2944 | ||
2945 | for (;;) { | |
2946 | ret = rbd_lock(rbd_dev); | |
2947 | if (ret != -EBUSY) | |
2948 | return ret; | |
2949 | ||
2950 | /* determine if the current lock holder is still alive */ | |
2951 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
2952 | if (ret) | |
2953 | return ret; | |
2954 | ||
2955 | if (num_lockers == 0) | |
2956 | goto again; | |
2957 | ||
2958 | ret = find_watcher(rbd_dev, lockers); | |
2959 | if (ret) { | |
2960 | if (ret > 0) | |
2961 | ret = 0; /* have to request lock */ | |
2962 | goto out; | |
2963 | } | |
2964 | ||
2965 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
2966 | ENTITY_NAME(lockers[0].id.name)); | |
2967 | ||
2968 | ret = ceph_monc_blacklist_add(&client->monc, | |
2969 | &lockers[0].info.addr); | |
2970 | if (ret) { | |
2971 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
2972 | ENTITY_NAME(lockers[0].id.name), ret); | |
2973 | goto out; | |
2974 | } | |
2975 | ||
2976 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
2977 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2978 | lockers[0].id.cookie, | |
2979 | &lockers[0].id.name); | |
2980 | if (ret && ret != -ENOENT) | |
2981 | goto out; | |
2982 | ||
2983 | again: | |
2984 | ceph_free_lockers(lockers, num_lockers); | |
2985 | } | |
2986 | ||
2987 | out: | |
2988 | ceph_free_lockers(lockers, num_lockers); | |
2989 | return ret; | |
2990 | } | |
2991 | ||
2992 | /* | |
2993 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
2994 | */ | |
2995 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
2996 | int *pret) | |
2997 | { | |
2998 | enum rbd_lock_state lock_state; | |
2999 | ||
3000 | down_read(&rbd_dev->lock_rwsem); | |
3001 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3002 | rbd_dev->lock_state); | |
3003 | if (__rbd_is_lock_owner(rbd_dev)) { | |
3004 | lock_state = rbd_dev->lock_state; | |
3005 | up_read(&rbd_dev->lock_rwsem); | |
3006 | return lock_state; | |
3007 | } | |
3008 | ||
3009 | up_read(&rbd_dev->lock_rwsem); | |
3010 | down_write(&rbd_dev->lock_rwsem); | |
3011 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3012 | rbd_dev->lock_state); | |
3013 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
3014 | *pret = rbd_try_lock(rbd_dev); | |
3015 | if (*pret) | |
3016 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
3017 | } | |
3018 | ||
3019 | lock_state = rbd_dev->lock_state; | |
3020 | up_write(&rbd_dev->lock_rwsem); | |
3021 | return lock_state; | |
3022 | } | |
3023 | ||
3024 | static void rbd_acquire_lock(struct work_struct *work) | |
3025 | { | |
3026 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3027 | struct rbd_device, lock_dwork); | |
3028 | enum rbd_lock_state lock_state; | |
37f13252 | 3029 | int ret = 0; |
ed95b21a ID |
3030 | |
3031 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3032 | again: | |
3033 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
3034 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
3035 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
3036 | wake_requests(rbd_dev, true); | |
3037 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
3038 | rbd_dev, lock_state, ret); | |
3039 | return; | |
3040 | } | |
3041 | ||
3042 | ret = rbd_request_lock(rbd_dev); | |
3043 | if (ret == -ETIMEDOUT) { | |
3044 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
3045 | } else if (ret == -EROFS) { |
3046 | rbd_warn(rbd_dev, "peer will not release lock"); | |
3047 | /* | |
3048 | * If this is rbd_add_acquire_lock(), we want to fail | |
3049 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
3050 | * want to block. | |
3051 | */ | |
3052 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
3053 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
3054 | /* wake "rbd map --exclusive" process */ | |
3055 | wake_requests(rbd_dev, false); | |
3056 | } | |
ed95b21a ID |
3057 | } else if (ret < 0) { |
3058 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3059 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3060 | RBD_RETRY_DELAY); | |
3061 | } else { | |
3062 | /* | |
3063 | * lock owner acked, but resend if we don't see them | |
3064 | * release the lock | |
3065 | */ | |
3066 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3067 | rbd_dev); | |
3068 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3069 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3070 | } | |
3071 | } | |
3072 | ||
3073 | /* | |
3074 | * lock_rwsem must be held for write | |
3075 | */ | |
3076 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3077 | { | |
3078 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3079 | rbd_dev->lock_state); | |
3080 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3081 | return false; | |
3082 | ||
3083 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3084 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3085 | /* |
ed95b21a | 3086 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3087 | * |
ed95b21a ID |
3088 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3089 | * may be shared with other devices. | |
52bb1f9b | 3090 | */ |
ed95b21a ID |
3091 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3092 | up_read(&rbd_dev->lock_rwsem); | |
3093 | ||
3094 | down_write(&rbd_dev->lock_rwsem); | |
3095 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3096 | rbd_dev->lock_state); | |
3097 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3098 | return false; | |
3099 | ||
bbead745 ID |
3100 | rbd_unlock(rbd_dev); |
3101 | /* | |
3102 | * Give others a chance to grab the lock - we would re-acquire | |
3103 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3104 | * otherwise. We need to ack our own notifications, so this | |
3105 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3106 | * after wake_requests() in rbd_handle_released_lock(). | |
3107 | */ | |
3108 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3109 | return true; |
3110 | } | |
3111 | ||
3112 | static void rbd_release_lock_work(struct work_struct *work) | |
3113 | { | |
3114 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3115 | unlock_work); | |
3116 | ||
3117 | down_write(&rbd_dev->lock_rwsem); | |
3118 | rbd_release_lock(rbd_dev); | |
3119 | up_write(&rbd_dev->lock_rwsem); | |
3120 | } | |
3121 | ||
3122 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3123 | void **p) | |
3124 | { | |
3125 | struct rbd_client_id cid = { 0 }; | |
3126 | ||
3127 | if (struct_v >= 2) { | |
3128 | cid.gid = ceph_decode_64(p); | |
3129 | cid.handle = ceph_decode_64(p); | |
3130 | } | |
3131 | ||
3132 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3133 | cid.handle); | |
3134 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3135 | down_write(&rbd_dev->lock_rwsem); | |
3136 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3137 | /* | |
3138 | * we already know that the remote client is | |
3139 | * the owner | |
3140 | */ | |
3141 | up_write(&rbd_dev->lock_rwsem); | |
3142 | return; | |
3143 | } | |
3144 | ||
3145 | rbd_set_owner_cid(rbd_dev, &cid); | |
3146 | downgrade_write(&rbd_dev->lock_rwsem); | |
3147 | } else { | |
3148 | down_read(&rbd_dev->lock_rwsem); | |
3149 | } | |
3150 | ||
3151 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3152 | wake_requests(rbd_dev, false); | |
3153 | up_read(&rbd_dev->lock_rwsem); | |
3154 | } | |
3155 | ||
3156 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3157 | void **p) | |
3158 | { | |
3159 | struct rbd_client_id cid = { 0 }; | |
3160 | ||
3161 | if (struct_v >= 2) { | |
3162 | cid.gid = ceph_decode_64(p); | |
3163 | cid.handle = ceph_decode_64(p); | |
3164 | } | |
3165 | ||
3166 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3167 | cid.handle); | |
3168 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3169 | down_write(&rbd_dev->lock_rwsem); | |
3170 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3171 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3172 | __func__, rbd_dev, cid.gid, cid.handle, | |
3173 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3174 | up_write(&rbd_dev->lock_rwsem); | |
3175 | return; | |
3176 | } | |
3177 | ||
3178 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3179 | downgrade_write(&rbd_dev->lock_rwsem); | |
3180 | } else { | |
3181 | down_read(&rbd_dev->lock_rwsem); | |
3182 | } | |
3183 | ||
3184 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3185 | wake_requests(rbd_dev, false); | |
3186 | up_read(&rbd_dev->lock_rwsem); | |
3187 | } | |
3188 | ||
3b77faa0 ID |
3189 | /* |
3190 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3191 | * ResponseMessage is needed. | |
3192 | */ | |
3193 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3194 | void **p) | |
ed95b21a ID |
3195 | { |
3196 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3197 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3198 | int result = 1; |
ed95b21a ID |
3199 | |
3200 | if (struct_v >= 2) { | |
3201 | cid.gid = ceph_decode_64(p); | |
3202 | cid.handle = ceph_decode_64(p); | |
3203 | } | |
3204 | ||
3205 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3206 | cid.handle); | |
3207 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3208 | return result; |
ed95b21a ID |
3209 | |
3210 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3211 | if (__rbd_is_lock_owner(rbd_dev)) { |
3212 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3213 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3214 | goto out_unlock; | |
3215 | ||
3216 | /* | |
3217 | * encode ResponseMessage(0) so the peer can detect | |
3218 | * a missing owner | |
3219 | */ | |
3220 | result = 0; | |
3221 | ||
3222 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3223 | if (!rbd_dev->opts->exclusive) { |
3224 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3225 | __func__, rbd_dev); | |
3226 | queue_work(rbd_dev->task_wq, | |
3227 | &rbd_dev->unlock_work); | |
3228 | } else { | |
3229 | /* refuse to release the lock */ | |
3230 | result = -EROFS; | |
3231 | } | |
ed95b21a ID |
3232 | } |
3233 | } | |
3b77faa0 ID |
3234 | |
3235 | out_unlock: | |
ed95b21a | 3236 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3237 | return result; |
ed95b21a ID |
3238 | } |
3239 | ||
3240 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3241 | u64 notify_id, u64 cookie, s32 *result) | |
3242 | { | |
3243 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
08a79102 KS |
3244 | char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
3245 | int buf_size = sizeof(buf); | |
ed95b21a ID |
3246 | int ret; |
3247 | ||
3248 | if (result) { | |
3249 | void *p = buf; | |
3250 | ||
3251 | /* encode ResponseMessage */ | |
3252 | ceph_start_encoding(&p, 1, 1, | |
3253 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3254 | ceph_encode_32(&p, *result); | |
3255 | } else { | |
3256 | buf_size = 0; | |
3257 | } | |
b8d70035 | 3258 | |
922dab61 ID |
3259 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3260 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3261 | buf, buf_size); |
52bb1f9b | 3262 | if (ret) |
ed95b21a ID |
3263 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3264 | } | |
3265 | ||
3266 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3267 | u64 cookie) | |
3268 | { | |
3269 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3270 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3271 | } | |
3272 | ||
3273 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3274 | u64 notify_id, u64 cookie, s32 result) | |
3275 | { | |
3276 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3277 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3278 | } | |
3279 | ||
3280 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3281 | u64 notifier_id, void *data, size_t data_len) | |
3282 | { | |
3283 | struct rbd_device *rbd_dev = arg; | |
3284 | void *p = data; | |
3285 | void *const end = p + data_len; | |
d4c2269b | 3286 | u8 struct_v = 0; |
ed95b21a ID |
3287 | u32 len; |
3288 | u32 notify_op; | |
3289 | int ret; | |
3290 | ||
3291 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3292 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3293 | if (data_len) { | |
3294 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3295 | &struct_v, &len); | |
3296 | if (ret) { | |
3297 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3298 | ret); | |
3299 | return; | |
3300 | } | |
3301 | ||
3302 | notify_op = ceph_decode_32(&p); | |
3303 | } else { | |
3304 | /* legacy notification for header updates */ | |
3305 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3306 | len = 0; | |
3307 | } | |
3308 | ||
3309 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3310 | switch (notify_op) { | |
3311 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3312 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3313 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3314 | break; | |
3315 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3316 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3317 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3318 | break; | |
3319 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3320 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3321 | if (ret <= 0) | |
ed95b21a | 3322 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3323 | cookie, ret); |
ed95b21a ID |
3324 | else |
3325 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3326 | break; | |
3327 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3328 | ret = rbd_dev_refresh(rbd_dev); | |
3329 | if (ret) | |
3330 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3331 | ||
3332 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3333 | break; | |
3334 | default: | |
3335 | if (rbd_is_lock_owner(rbd_dev)) | |
3336 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3337 | cookie, -EOPNOTSUPP); | |
3338 | else | |
3339 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3340 | break; | |
3341 | } | |
b8d70035 AE |
3342 | } |
3343 | ||
99d16943 ID |
3344 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3345 | ||
922dab61 | 3346 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3347 | { |
922dab61 | 3348 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3349 | |
922dab61 | 3350 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3351 | |
ed95b21a ID |
3352 | down_write(&rbd_dev->lock_rwsem); |
3353 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3354 | up_write(&rbd_dev->lock_rwsem); | |
3355 | ||
99d16943 ID |
3356 | mutex_lock(&rbd_dev->watch_mutex); |
3357 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3358 | __rbd_unregister_watch(rbd_dev); | |
3359 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3360 | |
99d16943 | 3361 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3362 | } |
99d16943 | 3363 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3364 | } |
3365 | ||
9969ebc5 | 3366 | /* |
99d16943 | 3367 | * watch_mutex must be locked |
9969ebc5 | 3368 | */ |
99d16943 | 3369 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3370 | { |
3371 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3372 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3373 | |
922dab61 | 3374 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3375 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3376 | |
922dab61 ID |
3377 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3378 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3379 | rbd_watch_errcb, rbd_dev); | |
3380 | if (IS_ERR(handle)) | |
3381 | return PTR_ERR(handle); | |
8eb87565 | 3382 | |
922dab61 | 3383 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3384 | return 0; |
b30a01f2 ID |
3385 | } |
3386 | ||
99d16943 ID |
3387 | /* |
3388 | * watch_mutex must be locked | |
3389 | */ | |
3390 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3391 | { |
922dab61 ID |
3392 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3393 | int ret; | |
b30a01f2 | 3394 | |
99d16943 ID |
3395 | rbd_assert(rbd_dev->watch_handle); |
3396 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3397 | |
922dab61 ID |
3398 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3399 | if (ret) | |
3400 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3401 | |
922dab61 | 3402 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3403 | } |
3404 | ||
99d16943 ID |
3405 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3406 | { | |
3407 | int ret; | |
3408 | ||
3409 | mutex_lock(&rbd_dev->watch_mutex); | |
3410 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3411 | ret = __rbd_register_watch(rbd_dev); | |
3412 | if (ret) | |
3413 | goto out; | |
3414 | ||
3415 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3416 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3417 | ||
3418 | out: | |
3419 | mutex_unlock(&rbd_dev->watch_mutex); | |
3420 | return ret; | |
3421 | } | |
3422 | ||
3423 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3424 | { |
99d16943 ID |
3425 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3426 | ||
ed95b21a ID |
3427 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3428 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3429 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3430 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3431 | } |
3432 | ||
3433 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3434 | { | |
ed95b21a | 3435 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3436 | cancel_tasks_sync(rbd_dev); |
3437 | ||
3438 | mutex_lock(&rbd_dev->watch_mutex); | |
3439 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3440 | __rbd_unregister_watch(rbd_dev); | |
3441 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3442 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3443 | |
23edca86 | 3444 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
811c6688 | 3445 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3446 | } |
3447 | ||
14bb211d ID |
3448 | /* |
3449 | * lock_rwsem must be held for write | |
3450 | */ | |
3451 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3452 | { | |
3453 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3454 | char cookie[32]; | |
3455 | int ret; | |
3456 | ||
3457 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3458 | ||
3459 | format_lock_cookie(rbd_dev, cookie); | |
3460 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3461 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3462 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3463 | RBD_LOCK_TAG, cookie); | |
3464 | if (ret) { | |
3465 | if (ret != -EOPNOTSUPP) | |
3466 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3467 | ret); | |
3468 | ||
3469 | /* | |
3470 | * Lock cookie cannot be updated on older OSDs, so do | |
3471 | * a manual release and queue an acquire. | |
3472 | */ | |
3473 | if (rbd_release_lock(rbd_dev)) | |
3474 | queue_delayed_work(rbd_dev->task_wq, | |
3475 | &rbd_dev->lock_dwork, 0); | |
3476 | } else { | |
edd8ca80 | 3477 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3478 | } |
3479 | } | |
3480 | ||
99d16943 ID |
3481 | static void rbd_reregister_watch(struct work_struct *work) |
3482 | { | |
3483 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3484 | struct rbd_device, watch_dwork); | |
3485 | int ret; | |
3486 | ||
3487 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3488 | ||
3489 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3490 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3491 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3492 | return; |
87c0fded | 3493 | } |
99d16943 ID |
3494 | |
3495 | ret = __rbd_register_watch(rbd_dev); | |
3496 | if (ret) { | |
3497 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3498 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3499 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3500 | wake_requests(rbd_dev, true); |
87c0fded | 3501 | } else { |
99d16943 ID |
3502 | queue_delayed_work(rbd_dev->task_wq, |
3503 | &rbd_dev->watch_dwork, | |
3504 | RBD_RETRY_DELAY); | |
87c0fded ID |
3505 | } |
3506 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3507 | return; |
99d16943 ID |
3508 | } |
3509 | ||
3510 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3511 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3512 | mutex_unlock(&rbd_dev->watch_mutex); | |
3513 | ||
14bb211d ID |
3514 | down_write(&rbd_dev->lock_rwsem); |
3515 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3516 | rbd_reacquire_lock(rbd_dev); | |
3517 | up_write(&rbd_dev->lock_rwsem); | |
3518 | ||
99d16943 ID |
3519 | ret = rbd_dev_refresh(rbd_dev); |
3520 | if (ret) | |
f6870cc9 | 3521 | rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
99d16943 ID |
3522 | } |
3523 | ||
36be9a76 | 3524 | /* |
f40eb349 AE |
3525 | * Synchronous osd object method call. Returns the number of bytes |
3526 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3527 | */ |
3528 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3529 | struct ceph_object_id *oid, |
3530 | struct ceph_object_locator *oloc, | |
36be9a76 | 3531 | const char *method_name, |
4157976b | 3532 | const void *outbound, |
36be9a76 | 3533 | size_t outbound_size, |
4157976b | 3534 | void *inbound, |
e2a58ee5 | 3535 | size_t inbound_size) |
36be9a76 | 3536 | { |
ecd4a68a ID |
3537 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3538 | struct page *req_page = NULL; | |
3539 | struct page *reply_page; | |
36be9a76 AE |
3540 | int ret; |
3541 | ||
3542 | /* | |
6010a451 AE |
3543 | * Method calls are ultimately read operations. The result |
3544 | * should placed into the inbound buffer provided. They | |
3545 | * also supply outbound data--parameters for the object | |
3546 | * method. Currently if this is present it will be a | |
3547 | * snapshot id. | |
36be9a76 | 3548 | */ |
ecd4a68a ID |
3549 | if (outbound) { |
3550 | if (outbound_size > PAGE_SIZE) | |
3551 | return -E2BIG; | |
36be9a76 | 3552 | |
ecd4a68a ID |
3553 | req_page = alloc_page(GFP_KERNEL); |
3554 | if (!req_page) | |
3555 | return -ENOMEM; | |
04017e29 | 3556 | |
ecd4a68a | 3557 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3558 | } |
36be9a76 | 3559 | |
ecd4a68a ID |
3560 | reply_page = alloc_page(GFP_KERNEL); |
3561 | if (!reply_page) { | |
3562 | if (req_page) | |
3563 | __free_page(req_page); | |
3564 | return -ENOMEM; | |
3565 | } | |
57385b51 | 3566 | |
ecd4a68a ID |
3567 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3568 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3569 | reply_page, &inbound_size); | |
3570 | if (!ret) { | |
3571 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3572 | ret = inbound_size; | |
3573 | } | |
36be9a76 | 3574 | |
ecd4a68a ID |
3575 | if (req_page) |
3576 | __free_page(req_page); | |
3577 | __free_page(reply_page); | |
36be9a76 AE |
3578 | return ret; |
3579 | } | |
3580 | ||
ed95b21a ID |
3581 | /* |
3582 | * lock_rwsem must be held for read | |
3583 | */ | |
2f18d466 | 3584 | static int rbd_wait_state_locked(struct rbd_device *rbd_dev, bool may_acquire) |
ed95b21a ID |
3585 | { |
3586 | DEFINE_WAIT(wait); | |
34f55d0b | 3587 | unsigned long timeout; |
2f18d466 ID |
3588 | int ret = 0; |
3589 | ||
3590 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) | |
3591 | return -EBLACKLISTED; | |
3592 | ||
3593 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3594 | return 0; | |
3595 | ||
3596 | if (!may_acquire) { | |
3597 | rbd_warn(rbd_dev, "exclusive lock required"); | |
3598 | return -EROFS; | |
3599 | } | |
ed95b21a ID |
3600 | |
3601 | do { | |
3602 | /* | |
3603 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3604 | * and cancel_delayed_work() in wake_requests(). | |
3605 | */ | |
3606 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3607 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3608 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3609 | TASK_UNINTERRUPTIBLE); | |
3610 | up_read(&rbd_dev->lock_rwsem); | |
34f55d0b DY |
3611 | timeout = schedule_timeout(ceph_timeout_jiffies( |
3612 | rbd_dev->opts->lock_timeout)); | |
ed95b21a | 3613 | down_read(&rbd_dev->lock_rwsem); |
2f18d466 ID |
3614 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3615 | ret = -EBLACKLISTED; | |
3616 | break; | |
3617 | } | |
34f55d0b DY |
3618 | if (!timeout) { |
3619 | rbd_warn(rbd_dev, "timed out waiting for lock"); | |
3620 | ret = -ETIMEDOUT; | |
3621 | break; | |
3622 | } | |
2f18d466 | 3623 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); |
87c0fded | 3624 | |
ed95b21a | 3625 | finish_wait(&rbd_dev->lock_waitq, &wait); |
2f18d466 | 3626 | return ret; |
ed95b21a ID |
3627 | } |
3628 | ||
7ad18afa | 3629 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3630 | { |
7ad18afa CH |
3631 | struct request *rq = blk_mq_rq_from_pdu(work); |
3632 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3633 | struct rbd_img_request *img_request; |
4e752f0a | 3634 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3635 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3636 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3637 | enum obj_operation_type op_type; |
4e752f0a | 3638 | u64 mapping_size; |
80de1912 | 3639 | bool must_be_locked; |
bf0d5f50 AE |
3640 | int result; |
3641 | ||
aebf526b CH |
3642 | switch (req_op(rq)) { |
3643 | case REQ_OP_DISCARD: | |
6ac56951 | 3644 | case REQ_OP_WRITE_ZEROES: |
90e98c52 | 3645 | op_type = OBJ_OP_DISCARD; |
aebf526b CH |
3646 | break; |
3647 | case REQ_OP_WRITE: | |
6d2940c8 | 3648 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
3649 | break; |
3650 | case REQ_OP_READ: | |
6d2940c8 | 3651 | op_type = OBJ_OP_READ; |
aebf526b CH |
3652 | break; |
3653 | default: | |
3654 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
3655 | result = -EIO; | |
3656 | goto err; | |
3657 | } | |
6d2940c8 | 3658 | |
bc1ecc65 | 3659 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3660 | |
bc1ecc65 ID |
3661 | if (!length) { |
3662 | dout("%s: zero-length request\n", __func__); | |
3663 | result = 0; | |
3664 | goto err_rq; | |
3665 | } | |
bf0d5f50 | 3666 | |
9568c93e ID |
3667 | rbd_assert(op_type == OBJ_OP_READ || |
3668 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 3669 | |
bc1ecc65 ID |
3670 | /* |
3671 | * Quit early if the mapped snapshot no longer exists. It's | |
3672 | * still possible the snapshot will have disappeared by the | |
3673 | * time our request arrives at the osd, but there's no sense in | |
3674 | * sending it if we already know. | |
3675 | */ | |
3676 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3677 | dout("request for non-existent snapshot"); | |
3678 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3679 | result = -ENXIO; | |
3680 | goto err_rq; | |
3681 | } | |
4dda41d3 | 3682 | |
bc1ecc65 ID |
3683 | if (offset && length > U64_MAX - offset + 1) { |
3684 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3685 | length); | |
3686 | result = -EINVAL; | |
3687 | goto err_rq; /* Shouldn't happen */ | |
3688 | } | |
4dda41d3 | 3689 | |
7ad18afa CH |
3690 | blk_mq_start_request(rq); |
3691 | ||
4e752f0a JD |
3692 | down_read(&rbd_dev->header_rwsem); |
3693 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3694 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3695 | snapc = rbd_dev->header.snapc; |
3696 | ceph_get_snap_context(snapc); | |
3697 | } | |
3698 | up_read(&rbd_dev->header_rwsem); | |
3699 | ||
3700 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3701 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3702 | length, mapping_size); |
bc1ecc65 ID |
3703 | result = -EIO; |
3704 | goto err_rq; | |
3705 | } | |
bf0d5f50 | 3706 | |
f9bebd58 ID |
3707 | must_be_locked = |
3708 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
3709 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
3710 | if (must_be_locked) { |
3711 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 ID |
3712 | result = rbd_wait_state_locked(rbd_dev, |
3713 | !rbd_dev->opts->exclusive); | |
3714 | if (result) | |
87c0fded | 3715 | goto err_unlock; |
ed95b21a ID |
3716 | } |
3717 | ||
dfd9875f | 3718 | img_request = rbd_img_request_create(rbd_dev, op_type, snapc); |
bc1ecc65 ID |
3719 | if (!img_request) { |
3720 | result = -ENOMEM; | |
ed95b21a | 3721 | goto err_unlock; |
bc1ecc65 ID |
3722 | } |
3723 | img_request->rq = rq; | |
70b16db8 | 3724 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3725 | |
90e98c52 | 3726 | if (op_type == OBJ_OP_DISCARD) |
5a237819 | 3727 | result = rbd_img_fill_nodata(img_request, offset, length); |
90e98c52 | 3728 | else |
5a237819 ID |
3729 | result = rbd_img_fill_from_bio(img_request, offset, length, |
3730 | rq->bio); | |
bc1ecc65 ID |
3731 | if (result) |
3732 | goto err_img_request; | |
bf0d5f50 | 3733 | |
efbd1a11 | 3734 | rbd_img_request_submit(img_request); |
ed95b21a ID |
3735 | if (must_be_locked) |
3736 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 3737 | return; |
bf0d5f50 | 3738 | |
bc1ecc65 ID |
3739 | err_img_request: |
3740 | rbd_img_request_put(img_request); | |
ed95b21a ID |
3741 | err_unlock: |
3742 | if (must_be_locked) | |
3743 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
3744 | err_rq: |
3745 | if (result) | |
3746 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3747 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3748 | ceph_put_snap_context(snapc); |
7ad18afa | 3749 | err: |
2a842aca | 3750 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 3751 | } |
bf0d5f50 | 3752 | |
fc17b653 | 3753 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 3754 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 3755 | { |
7ad18afa CH |
3756 | struct request *rq = bd->rq; |
3757 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3758 | |
7ad18afa | 3759 | queue_work(rbd_wq, work); |
fc17b653 | 3760 | return BLK_STS_OK; |
bf0d5f50 AE |
3761 | } |
3762 | ||
602adf40 YS |
3763 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3764 | { | |
5769ed0c ID |
3765 | blk_cleanup_queue(rbd_dev->disk->queue); |
3766 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
3767 | put_disk(rbd_dev->disk); | |
a0cab924 | 3768 | rbd_dev->disk = NULL; |
602adf40 YS |
3769 | } |
3770 | ||
788e2df3 | 3771 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
3772 | struct ceph_object_id *oid, |
3773 | struct ceph_object_locator *oloc, | |
3774 | void *buf, int buf_len) | |
788e2df3 AE |
3775 | |
3776 | { | |
fe5478e0 ID |
3777 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3778 | struct ceph_osd_request *req; | |
3779 | struct page **pages; | |
3780 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
3781 | int ret; |
3782 | ||
fe5478e0 ID |
3783 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
3784 | if (!req) | |
3785 | return -ENOMEM; | |
788e2df3 | 3786 | |
fe5478e0 ID |
3787 | ceph_oid_copy(&req->r_base_oid, oid); |
3788 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
3789 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 3790 | |
fe5478e0 ID |
3791 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
3792 | if (IS_ERR(pages)) { | |
3793 | ret = PTR_ERR(pages); | |
3794 | goto out_req; | |
3795 | } | |
1ceae7ef | 3796 | |
fe5478e0 ID |
3797 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
3798 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
3799 | true); | |
3800 | ||
26f887e0 ID |
3801 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
3802 | if (ret) | |
3803 | goto out_req; | |
3804 | ||
fe5478e0 ID |
3805 | ceph_osdc_start_request(osdc, req, false); |
3806 | ret = ceph_osdc_wait_request(osdc, req); | |
3807 | if (ret >= 0) | |
3808 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 3809 | |
fe5478e0 ID |
3810 | out_req: |
3811 | ceph_osdc_put_request(req); | |
788e2df3 AE |
3812 | return ret; |
3813 | } | |
3814 | ||
602adf40 | 3815 | /* |
662518b1 AE |
3816 | * Read the complete header for the given rbd device. On successful |
3817 | * return, the rbd_dev->header field will contain up-to-date | |
3818 | * information about the image. | |
602adf40 | 3819 | */ |
99a41ebc | 3820 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3821 | { |
4156d998 | 3822 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3823 | u32 snap_count = 0; |
4156d998 AE |
3824 | u64 names_size = 0; |
3825 | u32 want_count; | |
3826 | int ret; | |
602adf40 | 3827 | |
00f1f36f | 3828 | /* |
4156d998 AE |
3829 | * The complete header will include an array of its 64-bit |
3830 | * snapshot ids, followed by the names of those snapshots as | |
3831 | * a contiguous block of NUL-terminated strings. Note that | |
3832 | * the number of snapshots could change by the time we read | |
3833 | * it in, in which case we re-read it. | |
00f1f36f | 3834 | */ |
4156d998 AE |
3835 | do { |
3836 | size_t size; | |
3837 | ||
3838 | kfree(ondisk); | |
3839 | ||
3840 | size = sizeof (*ondisk); | |
3841 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3842 | size += names_size; | |
3843 | ondisk = kmalloc(size, GFP_KERNEL); | |
3844 | if (!ondisk) | |
662518b1 | 3845 | return -ENOMEM; |
4156d998 | 3846 | |
fe5478e0 ID |
3847 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
3848 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 3849 | if (ret < 0) |
662518b1 | 3850 | goto out; |
c0cd10db | 3851 | if ((size_t)ret < size) { |
4156d998 | 3852 | ret = -ENXIO; |
06ecc6cb AE |
3853 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3854 | size, ret); | |
662518b1 | 3855 | goto out; |
4156d998 AE |
3856 | } |
3857 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3858 | ret = -ENXIO; | |
06ecc6cb | 3859 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3860 | goto out; |
81e759fb | 3861 | } |
602adf40 | 3862 | |
4156d998 AE |
3863 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3864 | want_count = snap_count; | |
3865 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3866 | } while (snap_count != want_count); | |
00f1f36f | 3867 | |
662518b1 AE |
3868 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3869 | out: | |
4156d998 AE |
3870 | kfree(ondisk); |
3871 | ||
3872 | return ret; | |
602adf40 YS |
3873 | } |
3874 | ||
15228ede AE |
3875 | /* |
3876 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3877 | * has disappeared from the (just updated) snapshot context. | |
3878 | */ | |
3879 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3880 | { | |
3881 | u64 snap_id; | |
3882 | ||
3883 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3884 | return; | |
3885 | ||
3886 | snap_id = rbd_dev->spec->snap_id; | |
3887 | if (snap_id == CEPH_NOSNAP) | |
3888 | return; | |
3889 | ||
3890 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3891 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3892 | } | |
3893 | ||
9875201e JD |
3894 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3895 | { | |
3896 | sector_t size; | |
9875201e JD |
3897 | |
3898 | /* | |
811c6688 ID |
3899 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3900 | * try to update its size. If REMOVING is set, updating size | |
3901 | * is just useless work since the device can't be opened. | |
9875201e | 3902 | */ |
811c6688 ID |
3903 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3904 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3905 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3906 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3907 | set_capacity(rbd_dev->disk, size); | |
3908 | revalidate_disk(rbd_dev->disk); | |
3909 | } | |
3910 | } | |
3911 | ||
cc4a38bd | 3912 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3913 | { |
e627db08 | 3914 | u64 mapping_size; |
1fe5e993 AE |
3915 | int ret; |
3916 | ||
cfbf6377 | 3917 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3918 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3919 | |
3920 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 3921 | if (ret) |
73e39e4d | 3922 | goto out; |
15228ede | 3923 | |
e8f59b59 ID |
3924 | /* |
3925 | * If there is a parent, see if it has disappeared due to the | |
3926 | * mapped image getting flattened. | |
3927 | */ | |
3928 | if (rbd_dev->parent) { | |
3929 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3930 | if (ret) | |
73e39e4d | 3931 | goto out; |
e8f59b59 ID |
3932 | } |
3933 | ||
5ff1108c | 3934 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 3935 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
3936 | } else { |
3937 | /* validate mapped snapshot's EXISTS flag */ | |
3938 | rbd_exists_validate(rbd_dev); | |
3939 | } | |
15228ede | 3940 | |
73e39e4d | 3941 | out: |
cfbf6377 | 3942 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 3943 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 3944 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3945 | |
73e39e4d | 3946 | return ret; |
1fe5e993 AE |
3947 | } |
3948 | ||
d6296d39 CH |
3949 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
3950 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
3951 | { |
3952 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
3953 | ||
3954 | INIT_WORK(work, rbd_queue_workfn); | |
3955 | return 0; | |
3956 | } | |
3957 | ||
f363b089 | 3958 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 3959 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
3960 | .init_request = rbd_init_request, |
3961 | }; | |
3962 | ||
602adf40 YS |
3963 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3964 | { | |
3965 | struct gendisk *disk; | |
3966 | struct request_queue *q; | |
420efbdf ID |
3967 | unsigned int objset_bytes = |
3968 | rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; | |
7ad18afa | 3969 | int err; |
602adf40 | 3970 | |
602adf40 | 3971 | /* create gendisk info */ |
7e513d43 ID |
3972 | disk = alloc_disk(single_major ? |
3973 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3974 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3975 | if (!disk) |
1fcdb8aa | 3976 | return -ENOMEM; |
602adf40 | 3977 | |
f0f8cef5 | 3978 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3979 | rbd_dev->dev_id); |
602adf40 | 3980 | disk->major = rbd_dev->major; |
dd82fff1 | 3981 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3982 | if (single_major) |
3983 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3984 | disk->fops = &rbd_bd_ops; |
3985 | disk->private_data = rbd_dev; | |
3986 | ||
7ad18afa CH |
3987 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
3988 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 3989 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 3990 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 3991 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
3992 | rbd_dev->tag_set.nr_hw_queues = 1; |
3993 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
3994 | ||
3995 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
3996 | if (err) | |
602adf40 | 3997 | goto out_disk; |
029bcbd8 | 3998 | |
7ad18afa CH |
3999 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
4000 | if (IS_ERR(q)) { | |
4001 | err = PTR_ERR(q); | |
4002 | goto out_tag_set; | |
4003 | } | |
4004 | ||
8b904b5b | 4005 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
d8a2c89c | 4006 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
593a9e7b | 4007 | |
420efbdf | 4008 | blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
0d9fde4f | 4009 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 4010 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 4011 | blk_queue_max_segment_size(q, UINT_MAX); |
420efbdf ID |
4012 | blk_queue_io_min(q, objset_bytes); |
4013 | blk_queue_io_opt(q, objset_bytes); | |
029bcbd8 | 4014 | |
d9360540 ID |
4015 | if (rbd_dev->opts->trim) { |
4016 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
4017 | q->limits.discard_granularity = objset_bytes; | |
4018 | blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
4019 | blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
4020 | } | |
90e98c52 | 4021 | |
bae818ee | 4022 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 4023 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 4024 | |
5769ed0c ID |
4025 | /* |
4026 | * disk_release() expects a queue ref from add_disk() and will | |
4027 | * put it. Hold an extra ref until add_disk() is called. | |
4028 | */ | |
4029 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 4030 | disk->queue = q; |
602adf40 YS |
4031 | q->queuedata = rbd_dev; |
4032 | ||
4033 | rbd_dev->disk = disk; | |
602adf40 | 4034 | |
602adf40 | 4035 | return 0; |
7ad18afa CH |
4036 | out_tag_set: |
4037 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
4038 | out_disk: |
4039 | put_disk(disk); | |
7ad18afa | 4040 | return err; |
602adf40 YS |
4041 | } |
4042 | ||
dfc5606d YS |
4043 | /* |
4044 | sysfs | |
4045 | */ | |
4046 | ||
593a9e7b AE |
4047 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
4048 | { | |
4049 | return container_of(dev, struct rbd_device, dev); | |
4050 | } | |
4051 | ||
dfc5606d YS |
4052 | static ssize_t rbd_size_show(struct device *dev, |
4053 | struct device_attribute *attr, char *buf) | |
4054 | { | |
593a9e7b | 4055 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 4056 | |
fc71d833 AE |
4057 | return sprintf(buf, "%llu\n", |
4058 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
4059 | } |
4060 | ||
34b13184 AE |
4061 | /* |
4062 | * Note this shows the features for whatever's mapped, which is not | |
4063 | * necessarily the base image. | |
4064 | */ | |
4065 | static ssize_t rbd_features_show(struct device *dev, | |
4066 | struct device_attribute *attr, char *buf) | |
4067 | { | |
4068 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4069 | ||
4070 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4071 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4072 | } |
4073 | ||
dfc5606d YS |
4074 | static ssize_t rbd_major_show(struct device *dev, |
4075 | struct device_attribute *attr, char *buf) | |
4076 | { | |
593a9e7b | 4077 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4078 | |
fc71d833 AE |
4079 | if (rbd_dev->major) |
4080 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4081 | ||
4082 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4083 | } |
4084 | ||
4085 | static ssize_t rbd_minor_show(struct device *dev, | |
4086 | struct device_attribute *attr, char *buf) | |
4087 | { | |
4088 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4089 | |
dd82fff1 | 4090 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4091 | } |
4092 | ||
005a07bf ID |
4093 | static ssize_t rbd_client_addr_show(struct device *dev, |
4094 | struct device_attribute *attr, char *buf) | |
4095 | { | |
4096 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4097 | struct ceph_entity_addr *client_addr = | |
4098 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4099 | ||
4100 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4101 | le32_to_cpu(client_addr->nonce)); | |
4102 | } | |
4103 | ||
dfc5606d YS |
4104 | static ssize_t rbd_client_id_show(struct device *dev, |
4105 | struct device_attribute *attr, char *buf) | |
602adf40 | 4106 | { |
593a9e7b | 4107 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4108 | |
1dbb4399 | 4109 | return sprintf(buf, "client%lld\n", |
033268a5 | 4110 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4111 | } |
4112 | ||
267fb90b MC |
4113 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4114 | struct device_attribute *attr, char *buf) | |
4115 | { | |
4116 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4117 | ||
4118 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4119 | } | |
4120 | ||
0d6d1e9c MC |
4121 | static ssize_t rbd_config_info_show(struct device *dev, |
4122 | struct device_attribute *attr, char *buf) | |
4123 | { | |
4124 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4125 | ||
4126 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4127 | } |
4128 | ||
dfc5606d YS |
4129 | static ssize_t rbd_pool_show(struct device *dev, |
4130 | struct device_attribute *attr, char *buf) | |
602adf40 | 4131 | { |
593a9e7b | 4132 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4133 | |
0d7dbfce | 4134 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4135 | } |
4136 | ||
9bb2f334 AE |
4137 | static ssize_t rbd_pool_id_show(struct device *dev, |
4138 | struct device_attribute *attr, char *buf) | |
4139 | { | |
4140 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4141 | ||
0d7dbfce | 4142 | return sprintf(buf, "%llu\n", |
fc71d833 | 4143 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4144 | } |
4145 | ||
b26c047b ID |
4146 | static ssize_t rbd_pool_ns_show(struct device *dev, |
4147 | struct device_attribute *attr, char *buf) | |
4148 | { | |
4149 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4150 | ||
4151 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_ns ?: ""); | |
4152 | } | |
4153 | ||
dfc5606d YS |
4154 | static ssize_t rbd_name_show(struct device *dev, |
4155 | struct device_attribute *attr, char *buf) | |
4156 | { | |
593a9e7b | 4157 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4158 | |
a92ffdf8 AE |
4159 | if (rbd_dev->spec->image_name) |
4160 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4161 | ||
4162 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4163 | } |
4164 | ||
589d30e0 AE |
4165 | static ssize_t rbd_image_id_show(struct device *dev, |
4166 | struct device_attribute *attr, char *buf) | |
4167 | { | |
4168 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4169 | ||
0d7dbfce | 4170 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4171 | } |
4172 | ||
34b13184 AE |
4173 | /* |
4174 | * Shows the name of the currently-mapped snapshot (or | |
4175 | * RBD_SNAP_HEAD_NAME for the base image). | |
4176 | */ | |
dfc5606d YS |
4177 | static ssize_t rbd_snap_show(struct device *dev, |
4178 | struct device_attribute *attr, | |
4179 | char *buf) | |
4180 | { | |
593a9e7b | 4181 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4182 | |
0d7dbfce | 4183 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4184 | } |
4185 | ||
92a58671 MC |
4186 | static ssize_t rbd_snap_id_show(struct device *dev, |
4187 | struct device_attribute *attr, char *buf) | |
4188 | { | |
4189 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4190 | ||
4191 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4192 | } | |
4193 | ||
86b00e0d | 4194 | /* |
ff96128f ID |
4195 | * For a v2 image, shows the chain of parent images, separated by empty |
4196 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4197 | * image)". | |
86b00e0d AE |
4198 | */ |
4199 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4200 | struct device_attribute *attr, |
4201 | char *buf) | |
86b00e0d AE |
4202 | { |
4203 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4204 | ssize_t count = 0; |
86b00e0d | 4205 | |
ff96128f | 4206 | if (!rbd_dev->parent) |
86b00e0d AE |
4207 | return sprintf(buf, "(no parent image)\n"); |
4208 | ||
ff96128f ID |
4209 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4210 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4211 | ||
4212 | count += sprintf(&buf[count], "%s" | |
4213 | "pool_id %llu\npool_name %s\n" | |
e92c0eaf | 4214 | "pool_ns %s\n" |
ff96128f ID |
4215 | "image_id %s\nimage_name %s\n" |
4216 | "snap_id %llu\nsnap_name %s\n" | |
4217 | "overlap %llu\n", | |
4218 | !count ? "" : "\n", /* first? */ | |
4219 | spec->pool_id, spec->pool_name, | |
e92c0eaf | 4220 | spec->pool_ns ?: "", |
ff96128f ID |
4221 | spec->image_id, spec->image_name ?: "(unknown)", |
4222 | spec->snap_id, spec->snap_name, | |
4223 | rbd_dev->parent_overlap); | |
4224 | } | |
4225 | ||
4226 | return count; | |
86b00e0d AE |
4227 | } |
4228 | ||
dfc5606d YS |
4229 | static ssize_t rbd_image_refresh(struct device *dev, |
4230 | struct device_attribute *attr, | |
4231 | const char *buf, | |
4232 | size_t size) | |
4233 | { | |
593a9e7b | 4234 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4235 | int ret; |
602adf40 | 4236 | |
cc4a38bd | 4237 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4238 | if (ret) |
52bb1f9b | 4239 | return ret; |
b813623a | 4240 | |
52bb1f9b | 4241 | return size; |
dfc5606d | 4242 | } |
602adf40 | 4243 | |
5657a819 JP |
4244 | static DEVICE_ATTR(size, 0444, rbd_size_show, NULL); |
4245 | static DEVICE_ATTR(features, 0444, rbd_features_show, NULL); | |
4246 | static DEVICE_ATTR(major, 0444, rbd_major_show, NULL); | |
4247 | static DEVICE_ATTR(minor, 0444, rbd_minor_show, NULL); | |
4248 | static DEVICE_ATTR(client_addr, 0444, rbd_client_addr_show, NULL); | |
4249 | static DEVICE_ATTR(client_id, 0444, rbd_client_id_show, NULL); | |
4250 | static DEVICE_ATTR(cluster_fsid, 0444, rbd_cluster_fsid_show, NULL); | |
4251 | static DEVICE_ATTR(config_info, 0400, rbd_config_info_show, NULL); | |
4252 | static DEVICE_ATTR(pool, 0444, rbd_pool_show, NULL); | |
4253 | static DEVICE_ATTR(pool_id, 0444, rbd_pool_id_show, NULL); | |
b26c047b | 4254 | static DEVICE_ATTR(pool_ns, 0444, rbd_pool_ns_show, NULL); |
5657a819 JP |
4255 | static DEVICE_ATTR(name, 0444, rbd_name_show, NULL); |
4256 | static DEVICE_ATTR(image_id, 0444, rbd_image_id_show, NULL); | |
4257 | static DEVICE_ATTR(refresh, 0200, NULL, rbd_image_refresh); | |
4258 | static DEVICE_ATTR(current_snap, 0444, rbd_snap_show, NULL); | |
4259 | static DEVICE_ATTR(snap_id, 0444, rbd_snap_id_show, NULL); | |
4260 | static DEVICE_ATTR(parent, 0444, rbd_parent_show, NULL); | |
dfc5606d YS |
4261 | |
4262 | static struct attribute *rbd_attrs[] = { | |
4263 | &dev_attr_size.attr, | |
34b13184 | 4264 | &dev_attr_features.attr, |
dfc5606d | 4265 | &dev_attr_major.attr, |
dd82fff1 | 4266 | &dev_attr_minor.attr, |
005a07bf | 4267 | &dev_attr_client_addr.attr, |
dfc5606d | 4268 | &dev_attr_client_id.attr, |
267fb90b | 4269 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4270 | &dev_attr_config_info.attr, |
dfc5606d | 4271 | &dev_attr_pool.attr, |
9bb2f334 | 4272 | &dev_attr_pool_id.attr, |
b26c047b | 4273 | &dev_attr_pool_ns.attr, |
dfc5606d | 4274 | &dev_attr_name.attr, |
589d30e0 | 4275 | &dev_attr_image_id.attr, |
dfc5606d | 4276 | &dev_attr_current_snap.attr, |
92a58671 | 4277 | &dev_attr_snap_id.attr, |
86b00e0d | 4278 | &dev_attr_parent.attr, |
dfc5606d | 4279 | &dev_attr_refresh.attr, |
dfc5606d YS |
4280 | NULL |
4281 | }; | |
4282 | ||
4283 | static struct attribute_group rbd_attr_group = { | |
4284 | .attrs = rbd_attrs, | |
4285 | }; | |
4286 | ||
4287 | static const struct attribute_group *rbd_attr_groups[] = { | |
4288 | &rbd_attr_group, | |
4289 | NULL | |
4290 | }; | |
4291 | ||
6cac4695 | 4292 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4293 | |
b9942bc9 | 4294 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4295 | .name = "rbd", |
4296 | .groups = rbd_attr_groups, | |
6cac4695 | 4297 | .release = rbd_dev_release, |
dfc5606d YS |
4298 | }; |
4299 | ||
8b8fb99c AE |
4300 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4301 | { | |
4302 | kref_get(&spec->kref); | |
4303 | ||
4304 | return spec; | |
4305 | } | |
4306 | ||
4307 | static void rbd_spec_free(struct kref *kref); | |
4308 | static void rbd_spec_put(struct rbd_spec *spec) | |
4309 | { | |
4310 | if (spec) | |
4311 | kref_put(&spec->kref, rbd_spec_free); | |
4312 | } | |
4313 | ||
4314 | static struct rbd_spec *rbd_spec_alloc(void) | |
4315 | { | |
4316 | struct rbd_spec *spec; | |
4317 | ||
4318 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4319 | if (!spec) | |
4320 | return NULL; | |
04077599 ID |
4321 | |
4322 | spec->pool_id = CEPH_NOPOOL; | |
4323 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4324 | kref_init(&spec->kref); |
4325 | ||
8b8fb99c AE |
4326 | return spec; |
4327 | } | |
4328 | ||
4329 | static void rbd_spec_free(struct kref *kref) | |
4330 | { | |
4331 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4332 | ||
4333 | kfree(spec->pool_name); | |
b26c047b | 4334 | kfree(spec->pool_ns); |
8b8fb99c AE |
4335 | kfree(spec->image_id); |
4336 | kfree(spec->image_name); | |
4337 | kfree(spec->snap_name); | |
4338 | kfree(spec); | |
4339 | } | |
4340 | ||
1643dfa4 | 4341 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4342 | { |
99d16943 | 4343 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4344 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4345 | |
c41d13a3 | 4346 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4347 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4348 | kfree(rbd_dev->config_info); |
c41d13a3 | 4349 | |
dd5ac32d ID |
4350 | rbd_put_client(rbd_dev->rbd_client); |
4351 | rbd_spec_put(rbd_dev->spec); | |
4352 | kfree(rbd_dev->opts); | |
4353 | kfree(rbd_dev); | |
1643dfa4 ID |
4354 | } |
4355 | ||
4356 | static void rbd_dev_release(struct device *dev) | |
4357 | { | |
4358 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4359 | bool need_put = !!rbd_dev->opts; | |
4360 | ||
4361 | if (need_put) { | |
4362 | destroy_workqueue(rbd_dev->task_wq); | |
4363 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4364 | } | |
4365 | ||
4366 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4367 | |
4368 | /* | |
4369 | * This is racy, but way better than putting module outside of | |
4370 | * the release callback. The race window is pretty small, so | |
4371 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4372 | */ | |
4373 | if (need_put) | |
4374 | module_put(THIS_MODULE); | |
4375 | } | |
4376 | ||
1643dfa4 ID |
4377 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4378 | struct rbd_spec *spec) | |
c53d5893 AE |
4379 | { |
4380 | struct rbd_device *rbd_dev; | |
4381 | ||
1643dfa4 | 4382 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4383 | if (!rbd_dev) |
4384 | return NULL; | |
4385 | ||
4386 | spin_lock_init(&rbd_dev->lock); | |
4387 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4388 | init_rwsem(&rbd_dev->header_rwsem); |
4389 | ||
7e97332e | 4390 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4391 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4392 | rbd_dev->header_oloc.pool = spec->pool_id; |
b26c047b ID |
4393 | if (spec->pool_ns) { |
4394 | WARN_ON(!*spec->pool_ns); | |
4395 | rbd_dev->header_oloc.pool_ns = | |
4396 | ceph_find_or_create_string(spec->pool_ns, | |
4397 | strlen(spec->pool_ns)); | |
4398 | } | |
c41d13a3 | 4399 | |
99d16943 ID |
4400 | mutex_init(&rbd_dev->watch_mutex); |
4401 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4402 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4403 | ||
ed95b21a ID |
4404 | init_rwsem(&rbd_dev->lock_rwsem); |
4405 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4406 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4407 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4408 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4409 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4410 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4411 | ||
dd5ac32d ID |
4412 | rbd_dev->dev.bus = &rbd_bus_type; |
4413 | rbd_dev->dev.type = &rbd_device_type; | |
4414 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4415 | device_initialize(&rbd_dev->dev); |
4416 | ||
c53d5893 | 4417 | rbd_dev->rbd_client = rbdc; |
d147543d | 4418 | rbd_dev->spec = spec; |
0903e875 | 4419 | |
1643dfa4 ID |
4420 | return rbd_dev; |
4421 | } | |
4422 | ||
4423 | /* | |
4424 | * Create a mapping rbd_dev. | |
4425 | */ | |
4426 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4427 | struct rbd_spec *spec, | |
4428 | struct rbd_options *opts) | |
4429 | { | |
4430 | struct rbd_device *rbd_dev; | |
4431 | ||
4432 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4433 | if (!rbd_dev) | |
4434 | return NULL; | |
4435 | ||
4436 | rbd_dev->opts = opts; | |
4437 | ||
4438 | /* get an id and fill in device name */ | |
4439 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4440 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4441 | GFP_KERNEL); | |
4442 | if (rbd_dev->dev_id < 0) | |
4443 | goto fail_rbd_dev; | |
4444 | ||
4445 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4446 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4447 | rbd_dev->name); | |
4448 | if (!rbd_dev->task_wq) | |
4449 | goto fail_dev_id; | |
dd5ac32d | 4450 | |
1643dfa4 ID |
4451 | /* we have a ref from do_rbd_add() */ |
4452 | __module_get(THIS_MODULE); | |
dd5ac32d | 4453 | |
1643dfa4 | 4454 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4455 | return rbd_dev; |
1643dfa4 ID |
4456 | |
4457 | fail_dev_id: | |
4458 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4459 | fail_rbd_dev: | |
4460 | rbd_dev_free(rbd_dev); | |
4461 | return NULL; | |
c53d5893 AE |
4462 | } |
4463 | ||
4464 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4465 | { | |
dd5ac32d ID |
4466 | if (rbd_dev) |
4467 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4468 | } |
4469 | ||
9d475de5 AE |
4470 | /* |
4471 | * Get the size and object order for an image snapshot, or if | |
4472 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4473 | * image. | |
4474 | */ | |
4475 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4476 | u8 *order, u64 *snap_size) | |
4477 | { | |
4478 | __le64 snapid = cpu_to_le64(snap_id); | |
4479 | int ret; | |
4480 | struct { | |
4481 | u8 order; | |
4482 | __le64 size; | |
4483 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4484 | ||
ecd4a68a ID |
4485 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4486 | &rbd_dev->header_oloc, "get_size", | |
4487 | &snapid, sizeof(snapid), | |
4488 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4489 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4490 | if (ret < 0) |
4491 | return ret; | |
57385b51 AE |
4492 | if (ret < sizeof (size_buf)) |
4493 | return -ERANGE; | |
9d475de5 | 4494 | |
c3545579 | 4495 | if (order) { |
c86f86e9 | 4496 | *order = size_buf.order; |
c3545579 JD |
4497 | dout(" order %u", (unsigned int)*order); |
4498 | } | |
9d475de5 AE |
4499 | *snap_size = le64_to_cpu(size_buf.size); |
4500 | ||
c3545579 JD |
4501 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4502 | (unsigned long long)snap_id, | |
57385b51 | 4503 | (unsigned long long)*snap_size); |
9d475de5 AE |
4504 | |
4505 | return 0; | |
4506 | } | |
4507 | ||
4508 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4509 | { | |
4510 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4511 | &rbd_dev->header.obj_order, | |
4512 | &rbd_dev->header.image_size); | |
4513 | } | |
4514 | ||
1e130199 AE |
4515 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4516 | { | |
4517 | void *reply_buf; | |
4518 | int ret; | |
4519 | void *p; | |
4520 | ||
4521 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4522 | if (!reply_buf) | |
4523 | return -ENOMEM; | |
4524 | ||
ecd4a68a ID |
4525 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4526 | &rbd_dev->header_oloc, "get_object_prefix", | |
4527 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4528 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4529 | if (ret < 0) |
4530 | goto out; | |
4531 | ||
4532 | p = reply_buf; | |
4533 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4534 | p + ret, NULL, GFP_NOIO); |
4535 | ret = 0; | |
1e130199 AE |
4536 | |
4537 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4538 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4539 | rbd_dev->header.object_prefix = NULL; | |
4540 | } else { | |
4541 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4542 | } | |
1e130199 AE |
4543 | out: |
4544 | kfree(reply_buf); | |
4545 | ||
4546 | return ret; | |
4547 | } | |
4548 | ||
b1b5402a AE |
4549 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4550 | u64 *snap_features) | |
4551 | { | |
4552 | __le64 snapid = cpu_to_le64(snap_id); | |
4553 | struct { | |
4554 | __le64 features; | |
4555 | __le64 incompat; | |
4157976b | 4556 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4557 | u64 unsup; |
b1b5402a AE |
4558 | int ret; |
4559 | ||
ecd4a68a ID |
4560 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4561 | &rbd_dev->header_oloc, "get_features", | |
4562 | &snapid, sizeof(snapid), | |
4563 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4564 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4565 | if (ret < 0) |
4566 | return ret; | |
57385b51 AE |
4567 | if (ret < sizeof (features_buf)) |
4568 | return -ERANGE; | |
d889140c | 4569 | |
d3767f0f ID |
4570 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4571 | if (unsup) { | |
4572 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4573 | unsup); | |
b8f5c6ed | 4574 | return -ENXIO; |
d3767f0f | 4575 | } |
d889140c | 4576 | |
b1b5402a AE |
4577 | *snap_features = le64_to_cpu(features_buf.features); |
4578 | ||
4579 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4580 | (unsigned long long)snap_id, |
4581 | (unsigned long long)*snap_features, | |
4582 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4583 | |
4584 | return 0; | |
4585 | } | |
4586 | ||
4587 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4588 | { | |
4589 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4590 | &rbd_dev->header.features); | |
4591 | } | |
4592 | ||
eb3b2d6b ID |
4593 | struct parent_image_info { |
4594 | u64 pool_id; | |
e92c0eaf | 4595 | const char *pool_ns; |
eb3b2d6b ID |
4596 | const char *image_id; |
4597 | u64 snap_id; | |
4598 | ||
e92c0eaf | 4599 | bool has_overlap; |
eb3b2d6b ID |
4600 | u64 overlap; |
4601 | }; | |
4602 | ||
e92c0eaf ID |
4603 | /* |
4604 | * The caller is responsible for @pii. | |
4605 | */ | |
4606 | static int decode_parent_image_spec(void **p, void *end, | |
4607 | struct parent_image_info *pii) | |
4608 | { | |
4609 | u8 struct_v; | |
4610 | u32 struct_len; | |
4611 | int ret; | |
4612 | ||
4613 | ret = ceph_start_decoding(p, end, 1, "ParentImageSpec", | |
4614 | &struct_v, &struct_len); | |
4615 | if (ret) | |
4616 | return ret; | |
4617 | ||
4618 | ceph_decode_64_safe(p, end, pii->pool_id, e_inval); | |
4619 | pii->pool_ns = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
4620 | if (IS_ERR(pii->pool_ns)) { | |
4621 | ret = PTR_ERR(pii->pool_ns); | |
4622 | pii->pool_ns = NULL; | |
4623 | return ret; | |
4624 | } | |
4625 | pii->image_id = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
4626 | if (IS_ERR(pii->image_id)) { | |
4627 | ret = PTR_ERR(pii->image_id); | |
4628 | pii->image_id = NULL; | |
4629 | return ret; | |
4630 | } | |
4631 | ceph_decode_64_safe(p, end, pii->snap_id, e_inval); | |
4632 | return 0; | |
4633 | ||
4634 | e_inval: | |
4635 | return -EINVAL; | |
4636 | } | |
4637 | ||
4638 | static int __get_parent_info(struct rbd_device *rbd_dev, | |
4639 | struct page *req_page, | |
4640 | struct page *reply_page, | |
4641 | struct parent_image_info *pii) | |
4642 | { | |
4643 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
4644 | size_t reply_len = PAGE_SIZE; | |
4645 | void *p, *end; | |
4646 | int ret; | |
4647 | ||
4648 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4649 | "rbd", "parent_get", CEPH_OSD_FLAG_READ, | |
4650 | req_page, sizeof(u64), reply_page, &reply_len); | |
4651 | if (ret) | |
4652 | return ret == -EOPNOTSUPP ? 1 : ret; | |
4653 | ||
4654 | p = page_address(reply_page); | |
4655 | end = p + reply_len; | |
4656 | ret = decode_parent_image_spec(&p, end, pii); | |
4657 | if (ret) | |
4658 | return ret; | |
4659 | ||
4660 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4661 | "rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ, | |
4662 | req_page, sizeof(u64), reply_page, &reply_len); | |
4663 | if (ret) | |
4664 | return ret; | |
4665 | ||
4666 | p = page_address(reply_page); | |
4667 | end = p + reply_len; | |
4668 | ceph_decode_8_safe(&p, end, pii->has_overlap, e_inval); | |
4669 | if (pii->has_overlap) | |
4670 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); | |
4671 | ||
4672 | return 0; | |
4673 | ||
4674 | e_inval: | |
4675 | return -EINVAL; | |
4676 | } | |
4677 | ||
eb3b2d6b ID |
4678 | /* |
4679 | * The caller is responsible for @pii. | |
4680 | */ | |
4681 | static int __get_parent_info_legacy(struct rbd_device *rbd_dev, | |
4682 | struct page *req_page, | |
4683 | struct page *reply_page, | |
4684 | struct parent_image_info *pii) | |
4685 | { | |
4686 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
4687 | size_t reply_len = PAGE_SIZE; | |
4688 | void *p, *end; | |
4689 | int ret; | |
4690 | ||
4691 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4692 | "rbd", "get_parent", CEPH_OSD_FLAG_READ, | |
4693 | req_page, sizeof(u64), reply_page, &reply_len); | |
4694 | if (ret) | |
4695 | return ret; | |
4696 | ||
4697 | p = page_address(reply_page); | |
4698 | end = p + reply_len; | |
4699 | ceph_decode_64_safe(&p, end, pii->pool_id, e_inval); | |
4700 | pii->image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); | |
4701 | if (IS_ERR(pii->image_id)) { | |
4702 | ret = PTR_ERR(pii->image_id); | |
4703 | pii->image_id = NULL; | |
4704 | return ret; | |
4705 | } | |
4706 | ceph_decode_64_safe(&p, end, pii->snap_id, e_inval); | |
e92c0eaf | 4707 | pii->has_overlap = true; |
eb3b2d6b ID |
4708 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
4709 | ||
4710 | return 0; | |
4711 | ||
4712 | e_inval: | |
4713 | return -EINVAL; | |
4714 | } | |
4715 | ||
4716 | static int get_parent_info(struct rbd_device *rbd_dev, | |
4717 | struct parent_image_info *pii) | |
4718 | { | |
4719 | struct page *req_page, *reply_page; | |
4720 | void *p; | |
4721 | int ret; | |
4722 | ||
4723 | req_page = alloc_page(GFP_KERNEL); | |
4724 | if (!req_page) | |
4725 | return -ENOMEM; | |
4726 | ||
4727 | reply_page = alloc_page(GFP_KERNEL); | |
4728 | if (!reply_page) { | |
4729 | __free_page(req_page); | |
4730 | return -ENOMEM; | |
4731 | } | |
4732 | ||
4733 | p = page_address(req_page); | |
4734 | ceph_encode_64(&p, rbd_dev->spec->snap_id); | |
e92c0eaf ID |
4735 | ret = __get_parent_info(rbd_dev, req_page, reply_page, pii); |
4736 | if (ret > 0) | |
4737 | ret = __get_parent_info_legacy(rbd_dev, req_page, reply_page, | |
4738 | pii); | |
eb3b2d6b ID |
4739 | |
4740 | __free_page(req_page); | |
4741 | __free_page(reply_page); | |
4742 | return ret; | |
4743 | } | |
4744 | ||
86b00e0d AE |
4745 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4746 | { | |
4747 | struct rbd_spec *parent_spec; | |
eb3b2d6b | 4748 | struct parent_image_info pii = { 0 }; |
86b00e0d AE |
4749 | int ret; |
4750 | ||
4751 | parent_spec = rbd_spec_alloc(); | |
4752 | if (!parent_spec) | |
4753 | return -ENOMEM; | |
4754 | ||
eb3b2d6b ID |
4755 | ret = get_parent_info(rbd_dev, &pii); |
4756 | if (ret) | |
86b00e0d | 4757 | goto out_err; |
86b00e0d | 4758 | |
e92c0eaf ID |
4759 | dout("%s pool_id %llu pool_ns %s image_id %s snap_id %llu has_overlap %d overlap %llu\n", |
4760 | __func__, pii.pool_id, pii.pool_ns, pii.image_id, pii.snap_id, | |
4761 | pii.has_overlap, pii.overlap); | |
86b00e0d | 4762 | |
e92c0eaf | 4763 | if (pii.pool_id == CEPH_NOPOOL || !pii.has_overlap) { |
392a9dad AE |
4764 | /* |
4765 | * Either the parent never existed, or we have | |
4766 | * record of it but the image got flattened so it no | |
4767 | * longer has a parent. When the parent of a | |
4768 | * layered image disappears we immediately set the | |
4769 | * overlap to 0. The effect of this is that all new | |
4770 | * requests will be treated as if the image had no | |
4771 | * parent. | |
e92c0eaf ID |
4772 | * |
4773 | * If !pii.has_overlap, the parent image spec is not | |
4774 | * applicable. It's there to avoid duplication in each | |
4775 | * snapshot record. | |
392a9dad AE |
4776 | */ |
4777 | if (rbd_dev->parent_overlap) { | |
4778 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4779 | rbd_dev_parent_put(rbd_dev); |
4780 | pr_info("%s: clone image has been flattened\n", | |
4781 | rbd_dev->disk->disk_name); | |
4782 | } | |
4783 | ||
86b00e0d | 4784 | goto out; /* No parent? No problem. */ |
392a9dad | 4785 | } |
86b00e0d | 4786 | |
0903e875 AE |
4787 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4788 | ||
4789 | ret = -EIO; | |
eb3b2d6b | 4790 | if (pii.pool_id > (u64)U32_MAX) { |
9584d508 | 4791 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
eb3b2d6b | 4792 | (unsigned long long)pii.pool_id, U32_MAX); |
86b00e0d AE |
4793 | goto out_err; |
4794 | } | |
86b00e0d | 4795 | |
3b5cf2a2 AE |
4796 | /* |
4797 | * The parent won't change (except when the clone is | |
4798 | * flattened, already handled that). So we only need to | |
4799 | * record the parent spec we have not already done so. | |
4800 | */ | |
4801 | if (!rbd_dev->parent_spec) { | |
eb3b2d6b | 4802 | parent_spec->pool_id = pii.pool_id; |
e92c0eaf ID |
4803 | if (pii.pool_ns && *pii.pool_ns) { |
4804 | parent_spec->pool_ns = pii.pool_ns; | |
4805 | pii.pool_ns = NULL; | |
4806 | } | |
eb3b2d6b ID |
4807 | parent_spec->image_id = pii.image_id; |
4808 | pii.image_id = NULL; | |
4809 | parent_spec->snap_id = pii.snap_id; | |
b26c047b | 4810 | |
70cf49cf AE |
4811 | rbd_dev->parent_spec = parent_spec; |
4812 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3b5cf2a2 AE |
4813 | } |
4814 | ||
4815 | /* | |
cf32bd9c ID |
4816 | * We always update the parent overlap. If it's zero we issue |
4817 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4818 | */ |
eb3b2d6b | 4819 | if (!pii.overlap) { |
3b5cf2a2 | 4820 | if (parent_spec) { |
cf32bd9c ID |
4821 | /* refresh, careful to warn just once */ |
4822 | if (rbd_dev->parent_overlap) | |
4823 | rbd_warn(rbd_dev, | |
4824 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4825 | } else { |
cf32bd9c ID |
4826 | /* initial probe */ |
4827 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4828 | } |
70cf49cf | 4829 | } |
eb3b2d6b | 4830 | rbd_dev->parent_overlap = pii.overlap; |
cf32bd9c | 4831 | |
86b00e0d AE |
4832 | out: |
4833 | ret = 0; | |
4834 | out_err: | |
e92c0eaf | 4835 | kfree(pii.pool_ns); |
eb3b2d6b | 4836 | kfree(pii.image_id); |
86b00e0d | 4837 | rbd_spec_put(parent_spec); |
86b00e0d AE |
4838 | return ret; |
4839 | } | |
4840 | ||
cc070d59 AE |
4841 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4842 | { | |
4843 | struct { | |
4844 | __le64 stripe_unit; | |
4845 | __le64 stripe_count; | |
4846 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4847 | size_t size = sizeof (striping_info_buf); | |
4848 | void *p; | |
cc070d59 AE |
4849 | int ret; |
4850 | ||
ecd4a68a ID |
4851 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4852 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
4853 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
4854 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4855 | if (ret < 0) | |
4856 | return ret; | |
4857 | if (ret < size) | |
4858 | return -ERANGE; | |
4859 | ||
cc070d59 | 4860 | p = &striping_info_buf; |
b1331852 ID |
4861 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
4862 | rbd_dev->header.stripe_count = ceph_decode_64(&p); | |
cc070d59 AE |
4863 | return 0; |
4864 | } | |
4865 | ||
7e97332e ID |
4866 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
4867 | { | |
4868 | __le64 data_pool_id; | |
4869 | int ret; | |
4870 | ||
4871 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
4872 | &rbd_dev->header_oloc, "get_data_pool", | |
4873 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
4874 | if (ret < 0) | |
4875 | return ret; | |
4876 | if (ret < sizeof(data_pool_id)) | |
4877 | return -EBADMSG; | |
4878 | ||
4879 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
4880 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
4881 | return 0; | |
4882 | } | |
4883 | ||
9e15b77d AE |
4884 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4885 | { | |
ecd4a68a | 4886 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
4887 | size_t image_id_size; |
4888 | char *image_id; | |
4889 | void *p; | |
4890 | void *end; | |
4891 | size_t size; | |
4892 | void *reply_buf = NULL; | |
4893 | size_t len = 0; | |
4894 | char *image_name = NULL; | |
4895 | int ret; | |
4896 | ||
4897 | rbd_assert(!rbd_dev->spec->image_name); | |
4898 | ||
69e7a02f AE |
4899 | len = strlen(rbd_dev->spec->image_id); |
4900 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4901 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4902 | if (!image_id) | |
4903 | return NULL; | |
4904 | ||
4905 | p = image_id; | |
4157976b | 4906 | end = image_id + image_id_size; |
57385b51 | 4907 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4908 | |
4909 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4910 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4911 | if (!reply_buf) | |
4912 | goto out; | |
4913 | ||
ecd4a68a ID |
4914 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
4915 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
4916 | "dir_get_name", image_id, image_id_size, | |
4917 | reply_buf, size); | |
9e15b77d AE |
4918 | if (ret < 0) |
4919 | goto out; | |
4920 | p = reply_buf; | |
f40eb349 AE |
4921 | end = reply_buf + ret; |
4922 | ||
9e15b77d AE |
4923 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4924 | if (IS_ERR(image_name)) | |
4925 | image_name = NULL; | |
4926 | else | |
4927 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4928 | out: | |
4929 | kfree(reply_buf); | |
4930 | kfree(image_id); | |
4931 | ||
4932 | return image_name; | |
4933 | } | |
4934 | ||
2ad3d716 AE |
4935 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4936 | { | |
4937 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4938 | const char *snap_name; | |
4939 | u32 which = 0; | |
4940 | ||
4941 | /* Skip over names until we find the one we are looking for */ | |
4942 | ||
4943 | snap_name = rbd_dev->header.snap_names; | |
4944 | while (which < snapc->num_snaps) { | |
4945 | if (!strcmp(name, snap_name)) | |
4946 | return snapc->snaps[which]; | |
4947 | snap_name += strlen(snap_name) + 1; | |
4948 | which++; | |
4949 | } | |
4950 | return CEPH_NOSNAP; | |
4951 | } | |
4952 | ||
4953 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4954 | { | |
4955 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4956 | u32 which; | |
4957 | bool found = false; | |
4958 | u64 snap_id; | |
4959 | ||
4960 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4961 | const char *snap_name; | |
4962 | ||
4963 | snap_id = snapc->snaps[which]; | |
4964 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4965 | if (IS_ERR(snap_name)) { |
4966 | /* ignore no-longer existing snapshots */ | |
4967 | if (PTR_ERR(snap_name) == -ENOENT) | |
4968 | continue; | |
4969 | else | |
4970 | break; | |
4971 | } | |
2ad3d716 AE |
4972 | found = !strcmp(name, snap_name); |
4973 | kfree(snap_name); | |
4974 | } | |
4975 | return found ? snap_id : CEPH_NOSNAP; | |
4976 | } | |
4977 | ||
4978 | /* | |
4979 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4980 | * no snapshot by that name is found, or if an error occurs. | |
4981 | */ | |
4982 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4983 | { | |
4984 | if (rbd_dev->image_format == 1) | |
4985 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4986 | ||
4987 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4988 | } | |
4989 | ||
9e15b77d | 4990 | /* |
04077599 ID |
4991 | * An image being mapped will have everything but the snap id. |
4992 | */ | |
4993 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4994 | { | |
4995 | struct rbd_spec *spec = rbd_dev->spec; | |
4996 | ||
4997 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4998 | rbd_assert(spec->image_id && spec->image_name); | |
4999 | rbd_assert(spec->snap_name); | |
5000 | ||
5001 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
5002 | u64 snap_id; | |
5003 | ||
5004 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
5005 | if (snap_id == CEPH_NOSNAP) | |
5006 | return -ENOENT; | |
5007 | ||
5008 | spec->snap_id = snap_id; | |
5009 | } else { | |
5010 | spec->snap_id = CEPH_NOSNAP; | |
5011 | } | |
5012 | ||
5013 | return 0; | |
5014 | } | |
5015 | ||
5016 | /* | |
5017 | * A parent image will have all ids but none of the names. | |
e1d4213f | 5018 | * |
04077599 ID |
5019 | * All names in an rbd spec are dynamically allocated. It's OK if we |
5020 | * can't figure out the name for an image id. | |
9e15b77d | 5021 | */ |
04077599 | 5022 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 5023 | { |
2e9f7f1c AE |
5024 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
5025 | struct rbd_spec *spec = rbd_dev->spec; | |
5026 | const char *pool_name; | |
5027 | const char *image_name; | |
5028 | const char *snap_name; | |
9e15b77d AE |
5029 | int ret; |
5030 | ||
04077599 ID |
5031 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
5032 | rbd_assert(spec->image_id); | |
5033 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 5034 | |
2e9f7f1c | 5035 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 5036 | |
2e9f7f1c AE |
5037 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
5038 | if (!pool_name) { | |
5039 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
5040 | return -EIO; |
5041 | } | |
2e9f7f1c AE |
5042 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
5043 | if (!pool_name) | |
9e15b77d AE |
5044 | return -ENOMEM; |
5045 | ||
5046 | /* Fetch the image name; tolerate failure here */ | |
5047 | ||
2e9f7f1c AE |
5048 | image_name = rbd_dev_image_name(rbd_dev); |
5049 | if (!image_name) | |
06ecc6cb | 5050 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 5051 | |
04077599 | 5052 | /* Fetch the snapshot name */ |
9e15b77d | 5053 | |
2e9f7f1c | 5054 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
5055 | if (IS_ERR(snap_name)) { |
5056 | ret = PTR_ERR(snap_name); | |
9e15b77d | 5057 | goto out_err; |
2e9f7f1c AE |
5058 | } |
5059 | ||
5060 | spec->pool_name = pool_name; | |
5061 | spec->image_name = image_name; | |
5062 | spec->snap_name = snap_name; | |
9e15b77d AE |
5063 | |
5064 | return 0; | |
04077599 | 5065 | |
9e15b77d | 5066 | out_err: |
2e9f7f1c AE |
5067 | kfree(image_name); |
5068 | kfree(pool_name); | |
9e15b77d AE |
5069 | return ret; |
5070 | } | |
5071 | ||
cc4a38bd | 5072 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
5073 | { |
5074 | size_t size; | |
5075 | int ret; | |
5076 | void *reply_buf; | |
5077 | void *p; | |
5078 | void *end; | |
5079 | u64 seq; | |
5080 | u32 snap_count; | |
5081 | struct ceph_snap_context *snapc; | |
5082 | u32 i; | |
5083 | ||
5084 | /* | |
5085 | * We'll need room for the seq value (maximum snapshot id), | |
5086 | * snapshot count, and array of that many snapshot ids. | |
5087 | * For now we have a fixed upper limit on the number we're | |
5088 | * prepared to receive. | |
5089 | */ | |
5090 | size = sizeof (__le64) + sizeof (__le32) + | |
5091 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
5092 | reply_buf = kzalloc(size, GFP_KERNEL); | |
5093 | if (!reply_buf) | |
5094 | return -ENOMEM; | |
5095 | ||
ecd4a68a ID |
5096 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5097 | &rbd_dev->header_oloc, "get_snapcontext", | |
5098 | NULL, 0, reply_buf, size); | |
36be9a76 | 5099 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
5100 | if (ret < 0) |
5101 | goto out; | |
5102 | ||
35d489f9 | 5103 | p = reply_buf; |
57385b51 AE |
5104 | end = reply_buf + ret; |
5105 | ret = -ERANGE; | |
35d489f9 AE |
5106 | ceph_decode_64_safe(&p, end, seq, out); |
5107 | ceph_decode_32_safe(&p, end, snap_count, out); | |
5108 | ||
5109 | /* | |
5110 | * Make sure the reported number of snapshot ids wouldn't go | |
5111 | * beyond the end of our buffer. But before checking that, | |
5112 | * make sure the computed size of the snapshot context we | |
5113 | * allocate is representable in a size_t. | |
5114 | */ | |
5115 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
5116 | / sizeof (u64)) { | |
5117 | ret = -EINVAL; | |
5118 | goto out; | |
5119 | } | |
5120 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
5121 | goto out; | |
468521c1 | 5122 | ret = 0; |
35d489f9 | 5123 | |
812164f8 | 5124 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
5125 | if (!snapc) { |
5126 | ret = -ENOMEM; | |
5127 | goto out; | |
5128 | } | |
35d489f9 | 5129 | snapc->seq = seq; |
35d489f9 AE |
5130 | for (i = 0; i < snap_count; i++) |
5131 | snapc->snaps[i] = ceph_decode_64(&p); | |
5132 | ||
49ece554 | 5133 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
5134 | rbd_dev->header.snapc = snapc; |
5135 | ||
5136 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 5137 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
5138 | out: |
5139 | kfree(reply_buf); | |
5140 | ||
57385b51 | 5141 | return ret; |
35d489f9 AE |
5142 | } |
5143 | ||
54cac61f AE |
5144 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
5145 | u64 snap_id) | |
b8b1e2db AE |
5146 | { |
5147 | size_t size; | |
5148 | void *reply_buf; | |
54cac61f | 5149 | __le64 snapid; |
b8b1e2db AE |
5150 | int ret; |
5151 | void *p; | |
5152 | void *end; | |
b8b1e2db AE |
5153 | char *snap_name; |
5154 | ||
5155 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
5156 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5157 | if (!reply_buf) | |
5158 | return ERR_PTR(-ENOMEM); | |
5159 | ||
54cac61f | 5160 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
5161 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5162 | &rbd_dev->header_oloc, "get_snapshot_name", | |
5163 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 5164 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
5165 | if (ret < 0) { |
5166 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 5167 | goto out; |
f40eb349 | 5168 | } |
b8b1e2db AE |
5169 | |
5170 | p = reply_buf; | |
f40eb349 | 5171 | end = reply_buf + ret; |
e5c35534 | 5172 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 5173 | if (IS_ERR(snap_name)) |
b8b1e2db | 5174 | goto out; |
b8b1e2db | 5175 | |
f40eb349 | 5176 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 5177 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
5178 | out: |
5179 | kfree(reply_buf); | |
5180 | ||
f40eb349 | 5181 | return snap_name; |
b8b1e2db AE |
5182 | } |
5183 | ||
2df3fac7 | 5184 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 5185 | { |
2df3fac7 | 5186 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 5187 | int ret; |
117973fb | 5188 | |
1617e40c JD |
5189 | ret = rbd_dev_v2_image_size(rbd_dev); |
5190 | if (ret) | |
cfbf6377 | 5191 | return ret; |
1617e40c | 5192 | |
2df3fac7 AE |
5193 | if (first_time) { |
5194 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5195 | if (ret) | |
cfbf6377 | 5196 | return ret; |
2df3fac7 AE |
5197 | } |
5198 | ||
cc4a38bd | 5199 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5200 | if (ret && first_time) { |
5201 | kfree(rbd_dev->header.object_prefix); | |
5202 | rbd_dev->header.object_prefix = NULL; | |
5203 | } | |
117973fb AE |
5204 | |
5205 | return ret; | |
5206 | } | |
5207 | ||
a720ae09 ID |
5208 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5209 | { | |
5210 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5211 | ||
5212 | if (rbd_dev->image_format == 1) | |
5213 | return rbd_dev_v1_header_info(rbd_dev); | |
5214 | ||
5215 | return rbd_dev_v2_header_info(rbd_dev); | |
5216 | } | |
5217 | ||
e28fff26 AE |
5218 | /* |
5219 | * Skips over white space at *buf, and updates *buf to point to the | |
5220 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5221 | * the token (string of non-white space characters) found. Note |
5222 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5223 | */ |
5224 | static inline size_t next_token(const char **buf) | |
5225 | { | |
5226 | /* | |
5227 | * These are the characters that produce nonzero for | |
5228 | * isspace() in the "C" and "POSIX" locales. | |
5229 | */ | |
5230 | const char *spaces = " \f\n\r\t\v"; | |
5231 | ||
5232 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5233 | ||
5234 | return strcspn(*buf, spaces); /* Return token length */ | |
5235 | } | |
5236 | ||
ea3352f4 AE |
5237 | /* |
5238 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5239 | * enough to hold a copy of it, and copies the token into the new | |
5240 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5241 | * that a duplicate buffer is created even for a zero-length token. | |
5242 | * | |
5243 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5244 | * pointer if memory for the duplicate was not available. If | |
5245 | * the lenp argument is a non-null pointer, the length of the token | |
5246 | * (not including the '\0') is returned in *lenp. | |
5247 | * | |
5248 | * If successful, the *buf pointer will be updated to point beyond | |
5249 | * the end of the found token. | |
5250 | * | |
5251 | * Note: uses GFP_KERNEL for allocation. | |
5252 | */ | |
5253 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5254 | { | |
5255 | char *dup; | |
5256 | size_t len; | |
5257 | ||
5258 | len = next_token(buf); | |
4caf35f9 | 5259 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5260 | if (!dup) |
5261 | return NULL; | |
ea3352f4 AE |
5262 | *(dup + len) = '\0'; |
5263 | *buf += len; | |
5264 | ||
5265 | if (lenp) | |
5266 | *lenp = len; | |
5267 | ||
5268 | return dup; | |
5269 | } | |
5270 | ||
a725f65e | 5271 | /* |
859c31df AE |
5272 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5273 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5274 | * and the data written is passed here via a NUL-terminated buffer. | |
5275 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5276 | * |
859c31df AE |
5277 | * The information extracted from these options is recorded in |
5278 | * the other parameters which return dynamically-allocated | |
5279 | * structures: | |
5280 | * ceph_opts | |
5281 | * The address of a pointer that will refer to a ceph options | |
5282 | * structure. Caller must release the returned pointer using | |
5283 | * ceph_destroy_options() when it is no longer needed. | |
5284 | * rbd_opts | |
5285 | * Address of an rbd options pointer. Fully initialized by | |
5286 | * this function; caller must release with kfree(). | |
5287 | * spec | |
5288 | * Address of an rbd image specification pointer. Fully | |
5289 | * initialized by this function based on parsed options. | |
5290 | * Caller must release with rbd_spec_put(). | |
5291 | * | |
5292 | * The options passed take this form: | |
5293 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5294 | * where: | |
5295 | * <mon_addrs> | |
5296 | * A comma-separated list of one or more monitor addresses. | |
5297 | * A monitor address is an ip address, optionally followed | |
5298 | * by a port number (separated by a colon). | |
5299 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5300 | * <options> | |
5301 | * A comma-separated list of ceph and/or rbd options. | |
5302 | * <pool_name> | |
5303 | * The name of the rados pool containing the rbd image. | |
5304 | * <image_name> | |
5305 | * The name of the image in that pool to map. | |
5306 | * <snap_id> | |
5307 | * An optional snapshot id. If provided, the mapping will | |
5308 | * present data from the image at the time that snapshot was | |
5309 | * created. The image head is used if no snapshot id is | |
5310 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5311 | */ |
859c31df | 5312 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5313 | struct ceph_options **ceph_opts, |
859c31df AE |
5314 | struct rbd_options **opts, |
5315 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5316 | { |
d22f76e7 | 5317 | size_t len; |
859c31df | 5318 | char *options; |
0ddebc0c | 5319 | const char *mon_addrs; |
ecb4dc22 | 5320 | char *snap_name; |
0ddebc0c | 5321 | size_t mon_addrs_size; |
c300156b | 5322 | struct parse_rbd_opts_ctx pctx = { 0 }; |
859c31df | 5323 | struct ceph_options *copts; |
dc79b113 | 5324 | int ret; |
e28fff26 AE |
5325 | |
5326 | /* The first four tokens are required */ | |
5327 | ||
7ef3214a | 5328 | len = next_token(&buf); |
4fb5d671 AE |
5329 | if (!len) { |
5330 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5331 | return -EINVAL; | |
5332 | } | |
0ddebc0c | 5333 | mon_addrs = buf; |
f28e565a | 5334 | mon_addrs_size = len + 1; |
7ef3214a | 5335 | buf += len; |
a725f65e | 5336 | |
dc79b113 | 5337 | ret = -EINVAL; |
f28e565a AE |
5338 | options = dup_token(&buf, NULL); |
5339 | if (!options) | |
dc79b113 | 5340 | return -ENOMEM; |
4fb5d671 AE |
5341 | if (!*options) { |
5342 | rbd_warn(NULL, "no options provided"); | |
5343 | goto out_err; | |
5344 | } | |
e28fff26 | 5345 | |
c300156b ID |
5346 | pctx.spec = rbd_spec_alloc(); |
5347 | if (!pctx.spec) | |
f28e565a | 5348 | goto out_mem; |
859c31df | 5349 | |
c300156b ID |
5350 | pctx.spec->pool_name = dup_token(&buf, NULL); |
5351 | if (!pctx.spec->pool_name) | |
859c31df | 5352 | goto out_mem; |
c300156b | 5353 | if (!*pctx.spec->pool_name) { |
4fb5d671 AE |
5354 | rbd_warn(NULL, "no pool name provided"); |
5355 | goto out_err; | |
5356 | } | |
e28fff26 | 5357 | |
c300156b ID |
5358 | pctx.spec->image_name = dup_token(&buf, NULL); |
5359 | if (!pctx.spec->image_name) | |
f28e565a | 5360 | goto out_mem; |
c300156b | 5361 | if (!*pctx.spec->image_name) { |
4fb5d671 AE |
5362 | rbd_warn(NULL, "no image name provided"); |
5363 | goto out_err; | |
5364 | } | |
d4b125e9 | 5365 | |
f28e565a AE |
5366 | /* |
5367 | * Snapshot name is optional; default is to use "-" | |
5368 | * (indicating the head/no snapshot). | |
5369 | */ | |
3feeb894 | 5370 | len = next_token(&buf); |
820a5f3e | 5371 | if (!len) { |
3feeb894 AE |
5372 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5373 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5374 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5375 | ret = -ENAMETOOLONG; |
f28e565a | 5376 | goto out_err; |
849b4260 | 5377 | } |
ecb4dc22 AE |
5378 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5379 | if (!snap_name) | |
f28e565a | 5380 | goto out_mem; |
ecb4dc22 | 5381 | *(snap_name + len) = '\0'; |
c300156b | 5382 | pctx.spec->snap_name = snap_name; |
e5c35534 | 5383 | |
0ddebc0c | 5384 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5385 | |
c300156b ID |
5386 | pctx.opts = kzalloc(sizeof(*pctx.opts), GFP_KERNEL); |
5387 | if (!pctx.opts) | |
4e9afeba AE |
5388 | goto out_mem; |
5389 | ||
c300156b ID |
5390 | pctx.opts->read_only = RBD_READ_ONLY_DEFAULT; |
5391 | pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; | |
5392 | pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; | |
5393 | pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; | |
5394 | pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT; | |
5395 | pctx.opts->trim = RBD_TRIM_DEFAULT; | |
d22f76e7 | 5396 | |
859c31df | 5397 | copts = ceph_parse_options(options, mon_addrs, |
c300156b ID |
5398 | mon_addrs + mon_addrs_size - 1, |
5399 | parse_rbd_opts_token, &pctx); | |
859c31df AE |
5400 | if (IS_ERR(copts)) { |
5401 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5402 | goto out_err; |
5403 | } | |
859c31df AE |
5404 | kfree(options); |
5405 | ||
5406 | *ceph_opts = copts; | |
c300156b ID |
5407 | *opts = pctx.opts; |
5408 | *rbd_spec = pctx.spec; | |
0ddebc0c | 5409 | |
dc79b113 | 5410 | return 0; |
f28e565a | 5411 | out_mem: |
dc79b113 | 5412 | ret = -ENOMEM; |
d22f76e7 | 5413 | out_err: |
c300156b ID |
5414 | kfree(pctx.opts); |
5415 | rbd_spec_put(pctx.spec); | |
f28e565a | 5416 | kfree(options); |
d22f76e7 | 5417 | |
dc79b113 | 5418 | return ret; |
a725f65e AE |
5419 | } |
5420 | ||
e010dd0a ID |
5421 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5422 | { | |
5423 | down_write(&rbd_dev->lock_rwsem); | |
5424 | if (__rbd_is_lock_owner(rbd_dev)) | |
5425 | rbd_unlock(rbd_dev); | |
5426 | up_write(&rbd_dev->lock_rwsem); | |
5427 | } | |
5428 | ||
5429 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5430 | { | |
2f18d466 ID |
5431 | int ret; |
5432 | ||
e010dd0a ID |
5433 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
5434 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5435 | return -EINVAL; | |
5436 | } | |
5437 | ||
5438 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5439 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 | 5440 | ret = rbd_wait_state_locked(rbd_dev, true); |
e010dd0a | 5441 | up_read(&rbd_dev->lock_rwsem); |
2f18d466 | 5442 | if (ret) { |
e010dd0a ID |
5443 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); |
5444 | return -EROFS; | |
5445 | } | |
5446 | ||
5447 | return 0; | |
5448 | } | |
5449 | ||
589d30e0 AE |
5450 | /* |
5451 | * An rbd format 2 image has a unique identifier, distinct from the | |
5452 | * name given to it by the user. Internally, that identifier is | |
5453 | * what's used to specify the names of objects related to the image. | |
5454 | * | |
5455 | * A special "rbd id" object is used to map an rbd image name to its | |
5456 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5457 | * with the supplied name. | |
5458 | * | |
5459 | * This function will record the given rbd_dev's image_id field if | |
5460 | * it can be determined, and in that case will return 0. If any | |
5461 | * errors occur a negative errno will be returned and the rbd_dev's | |
5462 | * image_id field will be unchanged (and should be NULL). | |
5463 | */ | |
5464 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5465 | { | |
5466 | int ret; | |
5467 | size_t size; | |
ecd4a68a | 5468 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5469 | void *response; |
c0fba368 | 5470 | char *image_id; |
2f82ee54 | 5471 | |
2c0d0a10 AE |
5472 | /* |
5473 | * When probing a parent image, the image id is already | |
5474 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5475 | * need to fetch the image id again in this case. We |
5476 | * do still need to set the image format though. | |
2c0d0a10 | 5477 | */ |
c0fba368 AE |
5478 | if (rbd_dev->spec->image_id) { |
5479 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5480 | ||
2c0d0a10 | 5481 | return 0; |
c0fba368 | 5482 | } |
2c0d0a10 | 5483 | |
589d30e0 AE |
5484 | /* |
5485 | * First, see if the format 2 image id file exists, and if | |
5486 | * so, get the image's persistent id from it. | |
5487 | */ | |
ecd4a68a ID |
5488 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5489 | rbd_dev->spec->image_name); | |
5490 | if (ret) | |
5491 | return ret; | |
5492 | ||
5493 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5494 | |
5495 | /* Response will be an encoded string, which includes a length */ | |
5496 | ||
5497 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5498 | response = kzalloc(size, GFP_NOIO); | |
5499 | if (!response) { | |
5500 | ret = -ENOMEM; | |
5501 | goto out; | |
5502 | } | |
5503 | ||
c0fba368 AE |
5504 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5505 | ||
ecd4a68a ID |
5506 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5507 | "get_id", NULL, 0, | |
5508 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5509 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5510 | if (ret == -ENOENT) { |
5511 | image_id = kstrdup("", GFP_KERNEL); | |
5512 | ret = image_id ? 0 : -ENOMEM; | |
5513 | if (!ret) | |
5514 | rbd_dev->image_format = 1; | |
7dd440c9 | 5515 | } else if (ret >= 0) { |
c0fba368 AE |
5516 | void *p = response; |
5517 | ||
5518 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5519 | NULL, GFP_NOIO); |
461f758a | 5520 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5521 | if (!ret) |
5522 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5523 | } |
5524 | ||
5525 | if (!ret) { | |
5526 | rbd_dev->spec->image_id = image_id; | |
5527 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5528 | } |
5529 | out: | |
5530 | kfree(response); | |
ecd4a68a | 5531 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5532 | return ret; |
5533 | } | |
5534 | ||
3abef3b3 AE |
5535 | /* |
5536 | * Undo whatever state changes are made by v1 or v2 header info | |
5537 | * call. | |
5538 | */ | |
6fd48b3b AE |
5539 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5540 | { | |
5541 | struct rbd_image_header *header; | |
5542 | ||
e69b8d41 | 5543 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5544 | |
5545 | /* Free dynamic fields from the header, then zero it out */ | |
5546 | ||
5547 | header = &rbd_dev->header; | |
812164f8 | 5548 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5549 | kfree(header->snap_sizes); |
5550 | kfree(header->snap_names); | |
5551 | kfree(header->object_prefix); | |
5552 | memset(header, 0, sizeof (*header)); | |
5553 | } | |
5554 | ||
2df3fac7 | 5555 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5556 | { |
5557 | int ret; | |
a30b71b9 | 5558 | |
1e130199 | 5559 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5560 | if (ret) |
b1b5402a AE |
5561 | goto out_err; |
5562 | ||
2df3fac7 AE |
5563 | /* |
5564 | * Get the and check features for the image. Currently the | |
5565 | * features are assumed to never change. | |
5566 | */ | |
b1b5402a | 5567 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5568 | if (ret) |
9d475de5 | 5569 | goto out_err; |
35d489f9 | 5570 | |
cc070d59 AE |
5571 | /* If the image supports fancy striping, get its parameters */ |
5572 | ||
5573 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5574 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5575 | if (ret < 0) | |
5576 | goto out_err; | |
5577 | } | |
a30b71b9 | 5578 | |
7e97332e ID |
5579 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5580 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5581 | if (ret) | |
5582 | goto out_err; | |
5583 | } | |
5584 | ||
263423f8 | 5585 | rbd_init_layout(rbd_dev); |
35152979 | 5586 | return 0; |
263423f8 | 5587 | |
9d475de5 | 5588 | out_err: |
642a2537 | 5589 | rbd_dev->header.features = 0; |
1e130199 AE |
5590 | kfree(rbd_dev->header.object_prefix); |
5591 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5592 | return ret; |
a30b71b9 AE |
5593 | } |
5594 | ||
6d69bb53 ID |
5595 | /* |
5596 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5597 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5598 | * length of the already discovered part of the parent chain. | |
5599 | */ | |
5600 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5601 | { |
2f82ee54 | 5602 | struct rbd_device *parent = NULL; |
124afba2 AE |
5603 | int ret; |
5604 | ||
5605 | if (!rbd_dev->parent_spec) | |
5606 | return 0; | |
124afba2 | 5607 | |
6d69bb53 ID |
5608 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5609 | pr_info("parent chain is too long (%d)\n", depth); | |
5610 | ret = -EINVAL; | |
5611 | goto out_err; | |
5612 | } | |
5613 | ||
1643dfa4 | 5614 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5615 | if (!parent) { |
5616 | ret = -ENOMEM; | |
124afba2 | 5617 | goto out_err; |
1f2c6651 ID |
5618 | } |
5619 | ||
5620 | /* | |
5621 | * Images related by parent/child relationships always share | |
5622 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5623 | */ | |
5624 | __rbd_get_client(rbd_dev->rbd_client); | |
5625 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5626 | |
6d69bb53 | 5627 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5628 | if (ret < 0) |
5629 | goto out_err; | |
1f2c6651 | 5630 | |
124afba2 | 5631 | rbd_dev->parent = parent; |
a2acd00e | 5632 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5633 | return 0; |
1f2c6651 | 5634 | |
124afba2 | 5635 | out_err: |
1f2c6651 | 5636 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5637 | rbd_dev_destroy(parent); |
124afba2 AE |
5638 | return ret; |
5639 | } | |
5640 | ||
5769ed0c ID |
5641 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5642 | { | |
5643 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5644 | rbd_dev_mapping_clear(rbd_dev); | |
5645 | rbd_free_disk(rbd_dev); | |
5646 | if (!single_major) | |
5647 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5648 | } | |
5649 | ||
811c6688 ID |
5650 | /* |
5651 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5652 | * upon return. | |
5653 | */ | |
200a6a8b | 5654 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5655 | { |
83a06263 | 5656 | int ret; |
d1cf5788 | 5657 | |
9b60e70b | 5658 | /* Record our major and minor device numbers. */ |
83a06263 | 5659 | |
9b60e70b ID |
5660 | if (!single_major) { |
5661 | ret = register_blkdev(0, rbd_dev->name); | |
5662 | if (ret < 0) | |
1643dfa4 | 5663 | goto err_out_unlock; |
9b60e70b ID |
5664 | |
5665 | rbd_dev->major = ret; | |
5666 | rbd_dev->minor = 0; | |
5667 | } else { | |
5668 | rbd_dev->major = rbd_major; | |
5669 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5670 | } | |
83a06263 AE |
5671 | |
5672 | /* Set up the blkdev mapping. */ | |
5673 | ||
5674 | ret = rbd_init_disk(rbd_dev); | |
5675 | if (ret) | |
5676 | goto err_out_blkdev; | |
5677 | ||
f35a4dee | 5678 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5679 | if (ret) |
5680 | goto err_out_disk; | |
bc1ecc65 | 5681 | |
f35a4dee | 5682 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5683 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5684 | |
5769ed0c | 5685 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5686 | if (ret) |
f5ee37bd | 5687 | goto err_out_mapping; |
83a06263 | 5688 | |
129b79d4 | 5689 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5690 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5691 | return 0; |
2f82ee54 | 5692 | |
f35a4dee AE |
5693 | err_out_mapping: |
5694 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5695 | err_out_disk: |
5696 | rbd_free_disk(rbd_dev); | |
5697 | err_out_blkdev: | |
9b60e70b ID |
5698 | if (!single_major) |
5699 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5700 | err_out_unlock: |
5701 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5702 | return ret; |
5703 | } | |
5704 | ||
332bb12d AE |
5705 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5706 | { | |
5707 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5708 | int ret; |
332bb12d AE |
5709 | |
5710 | /* Record the header object name for this rbd image. */ | |
5711 | ||
5712 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5713 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5714 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5715 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5716 | else |
c41d13a3 ID |
5717 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5718 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5719 | |
c41d13a3 | 5720 | return ret; |
332bb12d AE |
5721 | } |
5722 | ||
200a6a8b AE |
5723 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5724 | { | |
6fd48b3b | 5725 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
5726 | if (rbd_dev->opts) |
5727 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
5728 | rbd_dev->image_format = 0; |
5729 | kfree(rbd_dev->spec->image_id); | |
5730 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
5731 | } |
5732 | ||
a30b71b9 AE |
5733 | /* |
5734 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5735 | * device. If this image is the one being mapped (i.e., not a |
5736 | * parent), initiate a watch on its header object before using that | |
5737 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5738 | */ |
6d69bb53 | 5739 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5740 | { |
5741 | int ret; | |
5742 | ||
5743 | /* | |
3abef3b3 AE |
5744 | * Get the id from the image id object. Unless there's an |
5745 | * error, rbd_dev->spec->image_id will be filled in with | |
5746 | * a dynamically-allocated string, and rbd_dev->image_format | |
5747 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5748 | */ |
5749 | ret = rbd_dev_image_id(rbd_dev); | |
5750 | if (ret) | |
c0fba368 | 5751 | return ret; |
c0fba368 | 5752 | |
332bb12d AE |
5753 | ret = rbd_dev_header_name(rbd_dev); |
5754 | if (ret) | |
5755 | goto err_out_format; | |
5756 | ||
6d69bb53 | 5757 | if (!depth) { |
99d16943 | 5758 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5759 | if (ret) { |
5760 | if (ret == -ENOENT) | |
b26c047b | 5761 | pr_info("image %s/%s%s%s does not exist\n", |
1fe48023 | 5762 | rbd_dev->spec->pool_name, |
b26c047b ID |
5763 | rbd_dev->spec->pool_ns ?: "", |
5764 | rbd_dev->spec->pool_ns ? "/" : "", | |
1fe48023 | 5765 | rbd_dev->spec->image_name); |
c41d13a3 | 5766 | goto err_out_format; |
1fe48023 | 5767 | } |
1f3ef788 | 5768 | } |
b644de2b | 5769 | |
a720ae09 | 5770 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5771 | if (ret) |
b644de2b | 5772 | goto err_out_watch; |
83a06263 | 5773 | |
04077599 ID |
5774 | /* |
5775 | * If this image is the one being mapped, we have pool name and | |
5776 | * id, image name and id, and snap name - need to fill snap id. | |
5777 | * Otherwise this is a parent image, identified by pool, image | |
5778 | * and snap ids - need to fill in names for those ids. | |
5779 | */ | |
6d69bb53 | 5780 | if (!depth) |
04077599 ID |
5781 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5782 | else | |
5783 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5784 | if (ret) { |
5785 | if (ret == -ENOENT) | |
b26c047b | 5786 | pr_info("snap %s/%s%s%s@%s does not exist\n", |
1fe48023 | 5787 | rbd_dev->spec->pool_name, |
b26c047b ID |
5788 | rbd_dev->spec->pool_ns ?: "", |
5789 | rbd_dev->spec->pool_ns ? "/" : "", | |
1fe48023 ID |
5790 | rbd_dev->spec->image_name, |
5791 | rbd_dev->spec->snap_name); | |
33dca39f | 5792 | goto err_out_probe; |
1fe48023 | 5793 | } |
9bb81c9b | 5794 | |
e8f59b59 ID |
5795 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5796 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5797 | if (ret) | |
5798 | goto err_out_probe; | |
5799 | ||
5800 | /* | |
5801 | * Need to warn users if this image is the one being | |
5802 | * mapped and has a parent. | |
5803 | */ | |
6d69bb53 | 5804 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
5805 | rbd_warn(rbd_dev, |
5806 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5807 | } | |
5808 | ||
6d69bb53 | 5809 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5810 | if (ret) |
5811 | goto err_out_probe; | |
5812 | ||
5813 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5814 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5815 | return 0; |
e8f59b59 | 5816 | |
6fd48b3b AE |
5817 | err_out_probe: |
5818 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5819 | err_out_watch: |
6d69bb53 | 5820 | if (!depth) |
99d16943 | 5821 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5822 | err_out_format: |
5823 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5824 | kfree(rbd_dev->spec->image_id); |
5825 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5826 | return ret; |
5827 | } | |
5828 | ||
9b60e70b ID |
5829 | static ssize_t do_rbd_add(struct bus_type *bus, |
5830 | const char *buf, | |
5831 | size_t count) | |
602adf40 | 5832 | { |
cb8627c7 | 5833 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5834 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5835 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5836 | struct rbd_spec *spec = NULL; |
9d3997fd | 5837 | struct rbd_client *rbdc; |
b51c83c2 | 5838 | int rc; |
602adf40 YS |
5839 | |
5840 | if (!try_module_get(THIS_MODULE)) | |
5841 | return -ENODEV; | |
5842 | ||
602adf40 | 5843 | /* parse add command */ |
859c31df | 5844 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5845 | if (rc < 0) |
dd5ac32d | 5846 | goto out; |
78cea76e | 5847 | |
9d3997fd AE |
5848 | rbdc = rbd_get_client(ceph_opts); |
5849 | if (IS_ERR(rbdc)) { | |
5850 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5851 | goto err_out_args; |
9d3997fd | 5852 | } |
602adf40 | 5853 | |
602adf40 | 5854 | /* pick the pool */ |
dd435855 | 5855 | rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
1fe48023 ID |
5856 | if (rc < 0) { |
5857 | if (rc == -ENOENT) | |
5858 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5859 | goto err_out_client; |
1fe48023 | 5860 | } |
c0cd10db | 5861 | spec->pool_id = (u64)rc; |
859c31df | 5862 | |
d147543d | 5863 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5864 | if (!rbd_dev) { |
5865 | rc = -ENOMEM; | |
bd4ba655 | 5866 | goto err_out_client; |
b51c83c2 | 5867 | } |
c53d5893 AE |
5868 | rbdc = NULL; /* rbd_dev now owns this */ |
5869 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5870 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5871 | |
0d6d1e9c MC |
5872 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
5873 | if (!rbd_dev->config_info) { | |
5874 | rc = -ENOMEM; | |
5875 | goto err_out_rbd_dev; | |
5876 | } | |
5877 | ||
811c6688 | 5878 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5879 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
5880 | if (rc < 0) { |
5881 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 5882 | goto err_out_rbd_dev; |
0d6d1e9c | 5883 | } |
05fd6f6f | 5884 | |
7ce4eef7 | 5885 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 5886 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 5887 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 5888 | |
b536f69a | 5889 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 5890 | if (rc) |
8b679ec5 | 5891 | goto err_out_image_probe; |
3abef3b3 | 5892 | |
e010dd0a ID |
5893 | if (rbd_dev->opts->exclusive) { |
5894 | rc = rbd_add_acquire_lock(rbd_dev); | |
5895 | if (rc) | |
5896 | goto err_out_device_setup; | |
3abef3b3 AE |
5897 | } |
5898 | ||
5769ed0c ID |
5899 | /* Everything's ready. Announce the disk to the world. */ |
5900 | ||
5901 | rc = device_add(&rbd_dev->dev); | |
5902 | if (rc) | |
e010dd0a | 5903 | goto err_out_image_lock; |
5769ed0c ID |
5904 | |
5905 | add_disk(rbd_dev->disk); | |
5906 | /* see rbd_init_disk() */ | |
5907 | blk_put_queue(rbd_dev->disk->queue); | |
5908 | ||
5909 | spin_lock(&rbd_dev_list_lock); | |
5910 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5911 | spin_unlock(&rbd_dev_list_lock); | |
5912 | ||
5913 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
5914 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
5915 | rbd_dev->header.features); | |
dd5ac32d ID |
5916 | rc = count; |
5917 | out: | |
5918 | module_put(THIS_MODULE); | |
5919 | return rc; | |
b536f69a | 5920 | |
e010dd0a ID |
5921 | err_out_image_lock: |
5922 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
5923 | err_out_device_setup: |
5924 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
5925 | err_out_image_probe: |
5926 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
5927 | err_out_rbd_dev: |
5928 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5929 | err_out_client: |
9d3997fd | 5930 | rbd_put_client(rbdc); |
0ddebc0c | 5931 | err_out_args: |
859c31df | 5932 | rbd_spec_put(spec); |
d147543d | 5933 | kfree(rbd_opts); |
dd5ac32d | 5934 | goto out; |
602adf40 YS |
5935 | } |
5936 | ||
9b60e70b ID |
5937 | static ssize_t rbd_add(struct bus_type *bus, |
5938 | const char *buf, | |
5939 | size_t count) | |
5940 | { | |
5941 | if (single_major) | |
5942 | return -EINVAL; | |
5943 | ||
5944 | return do_rbd_add(bus, buf, count); | |
5945 | } | |
5946 | ||
5947 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5948 | const char *buf, | |
5949 | size_t count) | |
5950 | { | |
5951 | return do_rbd_add(bus, buf, count); | |
5952 | } | |
5953 | ||
05a46afd AE |
5954 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5955 | { | |
ad945fc1 | 5956 | while (rbd_dev->parent) { |
05a46afd AE |
5957 | struct rbd_device *first = rbd_dev; |
5958 | struct rbd_device *second = first->parent; | |
5959 | struct rbd_device *third; | |
5960 | ||
5961 | /* | |
5962 | * Follow to the parent with no grandparent and | |
5963 | * remove it. | |
5964 | */ | |
5965 | while (second && (third = second->parent)) { | |
5966 | first = second; | |
5967 | second = third; | |
5968 | } | |
ad945fc1 | 5969 | rbd_assert(second); |
8ad42cd0 | 5970 | rbd_dev_image_release(second); |
8b679ec5 | 5971 | rbd_dev_destroy(second); |
ad945fc1 AE |
5972 | first->parent = NULL; |
5973 | first->parent_overlap = 0; | |
5974 | ||
5975 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5976 | rbd_spec_put(first->parent_spec); |
5977 | first->parent_spec = NULL; | |
05a46afd AE |
5978 | } |
5979 | } | |
5980 | ||
9b60e70b ID |
5981 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5982 | const char *buf, | |
5983 | size_t count) | |
602adf40 YS |
5984 | { |
5985 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5986 | struct list_head *tmp; |
5987 | int dev_id; | |
0276dca6 | 5988 | char opt_buf[6]; |
0276dca6 | 5989 | bool force = false; |
0d8189e1 | 5990 | int ret; |
602adf40 | 5991 | |
0276dca6 MC |
5992 | dev_id = -1; |
5993 | opt_buf[0] = '\0'; | |
5994 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
5995 | if (dev_id < 0) { | |
5996 | pr_err("dev_id out of range\n"); | |
602adf40 | 5997 | return -EINVAL; |
0276dca6 MC |
5998 | } |
5999 | if (opt_buf[0] != '\0') { | |
6000 | if (!strcmp(opt_buf, "force")) { | |
6001 | force = true; | |
6002 | } else { | |
6003 | pr_err("bad remove option at '%s'\n", opt_buf); | |
6004 | return -EINVAL; | |
6005 | } | |
6006 | } | |
602adf40 | 6007 | |
751cc0e3 AE |
6008 | ret = -ENOENT; |
6009 | spin_lock(&rbd_dev_list_lock); | |
6010 | list_for_each(tmp, &rbd_dev_list) { | |
6011 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
6012 | if (rbd_dev->dev_id == dev_id) { | |
6013 | ret = 0; | |
6014 | break; | |
6015 | } | |
42382b70 | 6016 | } |
751cc0e3 AE |
6017 | if (!ret) { |
6018 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 6019 | if (rbd_dev->open_count && !force) |
751cc0e3 | 6020 | ret = -EBUSY; |
85f5a4d6 ID |
6021 | else if (test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
6022 | &rbd_dev->flags)) | |
6023 | ret = -EINPROGRESS; | |
751cc0e3 AE |
6024 | spin_unlock_irq(&rbd_dev->lock); |
6025 | } | |
6026 | spin_unlock(&rbd_dev_list_lock); | |
85f5a4d6 | 6027 | if (ret) |
1ba0f1e7 | 6028 | return ret; |
751cc0e3 | 6029 | |
0276dca6 MC |
6030 | if (force) { |
6031 | /* | |
6032 | * Prevent new IO from being queued and wait for existing | |
6033 | * IO to complete/fail. | |
6034 | */ | |
6035 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
6036 | blk_set_queue_dying(rbd_dev->disk->queue); | |
6037 | } | |
6038 | ||
5769ed0c ID |
6039 | del_gendisk(rbd_dev->disk); |
6040 | spin_lock(&rbd_dev_list_lock); | |
6041 | list_del_init(&rbd_dev->node); | |
6042 | spin_unlock(&rbd_dev_list_lock); | |
6043 | device_del(&rbd_dev->dev); | |
fca27065 | 6044 | |
e010dd0a | 6045 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 6046 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 6047 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 6048 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 6049 | return count; |
602adf40 YS |
6050 | } |
6051 | ||
9b60e70b ID |
6052 | static ssize_t rbd_remove(struct bus_type *bus, |
6053 | const char *buf, | |
6054 | size_t count) | |
6055 | { | |
6056 | if (single_major) | |
6057 | return -EINVAL; | |
6058 | ||
6059 | return do_rbd_remove(bus, buf, count); | |
6060 | } | |
6061 | ||
6062 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
6063 | const char *buf, | |
6064 | size_t count) | |
6065 | { | |
6066 | return do_rbd_remove(bus, buf, count); | |
6067 | } | |
6068 | ||
602adf40 YS |
6069 | /* |
6070 | * create control files in sysfs | |
dfc5606d | 6071 | * /sys/bus/rbd/... |
602adf40 | 6072 | */ |
7d8dc534 | 6073 | static int __init rbd_sysfs_init(void) |
602adf40 | 6074 | { |
dfc5606d | 6075 | int ret; |
602adf40 | 6076 | |
fed4c143 | 6077 | ret = device_register(&rbd_root_dev); |
21079786 | 6078 | if (ret < 0) |
dfc5606d | 6079 | return ret; |
602adf40 | 6080 | |
fed4c143 AE |
6081 | ret = bus_register(&rbd_bus_type); |
6082 | if (ret < 0) | |
6083 | device_unregister(&rbd_root_dev); | |
602adf40 | 6084 | |
602adf40 YS |
6085 | return ret; |
6086 | } | |
6087 | ||
7d8dc534 | 6088 | static void __exit rbd_sysfs_cleanup(void) |
602adf40 | 6089 | { |
dfc5606d | 6090 | bus_unregister(&rbd_bus_type); |
fed4c143 | 6091 | device_unregister(&rbd_root_dev); |
602adf40 YS |
6092 | } |
6093 | ||
7d8dc534 | 6094 | static int __init rbd_slab_init(void) |
1c2a9dfe AE |
6095 | { |
6096 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 6097 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
6098 | if (!rbd_img_request_cache) |
6099 | return -ENOMEM; | |
6100 | ||
6101 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 6102 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
6103 | if (!rbd_obj_request_cache) |
6104 | goto out_err; | |
6105 | ||
6c696d85 | 6106 | return 0; |
1c2a9dfe | 6107 | |
6c696d85 | 6108 | out_err: |
868311b1 AE |
6109 | kmem_cache_destroy(rbd_img_request_cache); |
6110 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
6111 | return -ENOMEM; |
6112 | } | |
6113 | ||
6114 | static void rbd_slab_exit(void) | |
6115 | { | |
868311b1 AE |
6116 | rbd_assert(rbd_obj_request_cache); |
6117 | kmem_cache_destroy(rbd_obj_request_cache); | |
6118 | rbd_obj_request_cache = NULL; | |
6119 | ||
1c2a9dfe AE |
6120 | rbd_assert(rbd_img_request_cache); |
6121 | kmem_cache_destroy(rbd_img_request_cache); | |
6122 | rbd_img_request_cache = NULL; | |
6123 | } | |
6124 | ||
cc344fa1 | 6125 | static int __init rbd_init(void) |
602adf40 YS |
6126 | { |
6127 | int rc; | |
6128 | ||
1e32d34c AE |
6129 | if (!libceph_compatible(NULL)) { |
6130 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
6131 | return -EINVAL; |
6132 | } | |
e1b4d96d | 6133 | |
1c2a9dfe | 6134 | rc = rbd_slab_init(); |
602adf40 YS |
6135 | if (rc) |
6136 | return rc; | |
e1b4d96d | 6137 | |
f5ee37bd ID |
6138 | /* |
6139 | * The number of active work items is limited by the number of | |
f77303bd | 6140 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
6141 | */ |
6142 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
6143 | if (!rbd_wq) { | |
6144 | rc = -ENOMEM; | |
6145 | goto err_out_slab; | |
6146 | } | |
6147 | ||
9b60e70b ID |
6148 | if (single_major) { |
6149 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
6150 | if (rbd_major < 0) { | |
6151 | rc = rbd_major; | |
f5ee37bd | 6152 | goto err_out_wq; |
9b60e70b ID |
6153 | } |
6154 | } | |
6155 | ||
1c2a9dfe AE |
6156 | rc = rbd_sysfs_init(); |
6157 | if (rc) | |
9b60e70b ID |
6158 | goto err_out_blkdev; |
6159 | ||
6160 | if (single_major) | |
6161 | pr_info("loaded (major %d)\n", rbd_major); | |
6162 | else | |
6163 | pr_info("loaded\n"); | |
1c2a9dfe | 6164 | |
e1b4d96d ID |
6165 | return 0; |
6166 | ||
9b60e70b ID |
6167 | err_out_blkdev: |
6168 | if (single_major) | |
6169 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
6170 | err_out_wq: |
6171 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
6172 | err_out_slab: |
6173 | rbd_slab_exit(); | |
1c2a9dfe | 6174 | return rc; |
602adf40 YS |
6175 | } |
6176 | ||
cc344fa1 | 6177 | static void __exit rbd_exit(void) |
602adf40 | 6178 | { |
ffe312cf | 6179 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6180 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6181 | if (single_major) |
6182 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6183 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6184 | rbd_slab_exit(); |
602adf40 YS |
6185 | } |
6186 | ||
6187 | module_init(rbd_init); | |
6188 | module_exit(rbd_exit); | |
6189 | ||
d552c619 | 6190 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6191 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6192 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6193 | /* following authorship retained from original osdblk.c */ |
6194 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6195 | ||
90da258b | 6196 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6197 | MODULE_LICENSE("GPL"); |