Commit | Line | Data |
---|---|---|
e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
ed95b21a | 34 | #include <linux/ceph/cls_lock_client.h> |
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 | ||
64 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
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; |
0d7dbfce | 184 | |
ecb4dc22 AE |
185 | const char *image_id; |
186 | const char *image_name; | |
0d7dbfce AE |
187 | |
188 | u64 snap_id; | |
ecb4dc22 | 189 | const char *snap_name; |
0d7dbfce AE |
190 | |
191 | struct kref kref; | |
192 | }; | |
193 | ||
602adf40 | 194 | /* |
f0f8cef5 | 195 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
196 | */ |
197 | struct rbd_client { | |
198 | struct ceph_client *client; | |
199 | struct kref kref; | |
200 | struct list_head node; | |
201 | }; | |
202 | ||
bf0d5f50 | 203 | struct rbd_img_request; |
bf0d5f50 | 204 | |
9969ebc5 | 205 | enum obj_request_type { |
a1fbb5e7 | 206 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 207 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 208 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
afb97888 | 209 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
9969ebc5 | 210 | }; |
bf0d5f50 | 211 | |
6d2940c8 | 212 | enum obj_operation_type { |
a1fbb5e7 | 213 | OBJ_OP_READ = 1, |
6d2940c8 | 214 | OBJ_OP_WRITE, |
90e98c52 | 215 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
216 | }; |
217 | ||
3da691bf ID |
218 | /* |
219 | * Writes go through the following state machine to deal with | |
220 | * layering: | |
221 | * | |
222 | * need copyup | |
223 | * RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP | |
224 | * | ^ | | |
225 | * v \------------------------------/ | |
226 | * done | |
227 | * ^ | |
228 | * | | |
229 | * RBD_OBJ_WRITE_FLAT | |
230 | * | |
231 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
232 | * there is a parent or not. | |
233 | */ | |
234 | enum rbd_obj_write_state { | |
235 | RBD_OBJ_WRITE_FLAT = 1, | |
236 | RBD_OBJ_WRITE_GUARD, | |
237 | RBD_OBJ_WRITE_COPYUP, | |
926f9b3f AE |
238 | }; |
239 | ||
bf0d5f50 | 240 | struct rbd_obj_request { |
43df3d35 | 241 | struct ceph_object_extent ex; |
c5b5ef6c | 242 | union { |
3da691bf ID |
243 | bool tried_parent; /* for reads */ |
244 | enum rbd_obj_write_state write_state; /* for writes */ | |
c5b5ef6c | 245 | }; |
bf0d5f50 | 246 | |
51c3509e | 247 | struct rbd_img_request *img_request; |
86bd7998 ID |
248 | struct ceph_file_extent *img_extents; |
249 | u32 num_img_extents; | |
bf0d5f50 | 250 | |
788e2df3 | 251 | union { |
5359a17d | 252 | struct ceph_bio_iter bio_pos; |
788e2df3 | 253 | struct { |
7e07efb1 ID |
254 | struct ceph_bvec_iter bvec_pos; |
255 | u32 bvec_count; | |
afb97888 | 256 | u32 bvec_idx; |
788e2df3 AE |
257 | }; |
258 | }; | |
7e07efb1 ID |
259 | struct bio_vec *copyup_bvecs; |
260 | u32 copyup_bvec_count; | |
bf0d5f50 AE |
261 | |
262 | struct ceph_osd_request *osd_req; | |
263 | ||
264 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 265 | int result; |
bf0d5f50 | 266 | |
bf0d5f50 AE |
267 | struct kref kref; |
268 | }; | |
269 | ||
0c425248 | 270 | enum img_req_flags { |
9849e986 | 271 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 272 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
273 | }; |
274 | ||
bf0d5f50 | 275 | struct rbd_img_request { |
bf0d5f50 | 276 | struct rbd_device *rbd_dev; |
9bb0248d | 277 | enum obj_operation_type op_type; |
ecc633ca | 278 | enum obj_request_type data_type; |
0c425248 | 279 | unsigned long flags; |
bf0d5f50 | 280 | union { |
9849e986 | 281 | u64 snap_id; /* for reads */ |
bf0d5f50 | 282 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
283 | }; |
284 | union { | |
285 | struct request *rq; /* block request */ | |
286 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 287 | }; |
15961b44 | 288 | spinlock_t completion_lock; |
55f27e09 | 289 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 290 | int result; /* first nonzero obj_request result */ |
bf0d5f50 | 291 | |
43df3d35 | 292 | struct list_head object_extents; /* obj_req.ex structs */ |
bf0d5f50 | 293 | u32 obj_request_count; |
7114edac | 294 | u32 pending_count; |
bf0d5f50 AE |
295 | |
296 | struct kref kref; | |
297 | }; | |
298 | ||
299 | #define for_each_obj_request(ireq, oreq) \ | |
43df3d35 | 300 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 301 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
43df3d35 | 302 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 303 | |
99d16943 ID |
304 | enum rbd_watch_state { |
305 | RBD_WATCH_STATE_UNREGISTERED, | |
306 | RBD_WATCH_STATE_REGISTERED, | |
307 | RBD_WATCH_STATE_ERROR, | |
308 | }; | |
309 | ||
ed95b21a ID |
310 | enum rbd_lock_state { |
311 | RBD_LOCK_STATE_UNLOCKED, | |
312 | RBD_LOCK_STATE_LOCKED, | |
313 | RBD_LOCK_STATE_RELEASING, | |
314 | }; | |
315 | ||
316 | /* WatchNotify::ClientId */ | |
317 | struct rbd_client_id { | |
318 | u64 gid; | |
319 | u64 handle; | |
320 | }; | |
321 | ||
f84344f3 | 322 | struct rbd_mapping { |
99c1f08f | 323 | u64 size; |
34b13184 | 324 | u64 features; |
f84344f3 AE |
325 | }; |
326 | ||
602adf40 YS |
327 | /* |
328 | * a single device | |
329 | */ | |
330 | struct rbd_device { | |
de71a297 | 331 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
332 | |
333 | int major; /* blkdev assigned major */ | |
dd82fff1 | 334 | int minor; |
602adf40 | 335 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 336 | |
a30b71b9 | 337 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
338 | struct rbd_client *rbd_client; |
339 | ||
340 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
341 | ||
b82d167b | 342 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
343 | |
344 | struct rbd_image_header header; | |
b82d167b | 345 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 346 | struct rbd_spec *spec; |
d147543d | 347 | struct rbd_options *opts; |
0d6d1e9c | 348 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 349 | |
c41d13a3 | 350 | struct ceph_object_id header_oid; |
922dab61 | 351 | struct ceph_object_locator header_oloc; |
971f839a | 352 | |
1643dfa4 | 353 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 354 | |
99d16943 ID |
355 | struct mutex watch_mutex; |
356 | enum rbd_watch_state watch_state; | |
922dab61 | 357 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
358 | u64 watch_cookie; |
359 | struct delayed_work watch_dwork; | |
59c2be1e | 360 | |
ed95b21a ID |
361 | struct rw_semaphore lock_rwsem; |
362 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 363 | char lock_cookie[32]; |
ed95b21a ID |
364 | struct rbd_client_id owner_cid; |
365 | struct work_struct acquired_lock_work; | |
366 | struct work_struct released_lock_work; | |
367 | struct delayed_work lock_dwork; | |
368 | struct work_struct unlock_work; | |
369 | wait_queue_head_t lock_waitq; | |
370 | ||
1643dfa4 | 371 | struct workqueue_struct *task_wq; |
59c2be1e | 372 | |
86b00e0d AE |
373 | struct rbd_spec *parent_spec; |
374 | u64 parent_overlap; | |
a2acd00e | 375 | atomic_t parent_ref; |
2f82ee54 | 376 | struct rbd_device *parent; |
86b00e0d | 377 | |
7ad18afa CH |
378 | /* Block layer tags. */ |
379 | struct blk_mq_tag_set tag_set; | |
380 | ||
c666601a JD |
381 | /* protects updating the header */ |
382 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
383 | |
384 | struct rbd_mapping mapping; | |
602adf40 YS |
385 | |
386 | struct list_head node; | |
dfc5606d | 387 | |
dfc5606d YS |
388 | /* sysfs related */ |
389 | struct device dev; | |
b82d167b | 390 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
391 | }; |
392 | ||
b82d167b | 393 | /* |
87c0fded ID |
394 | * Flag bits for rbd_dev->flags: |
395 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
396 | * by rbd_dev->lock | |
397 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 398 | */ |
6d292906 AE |
399 | enum rbd_dev_flags { |
400 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 401 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 402 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
403 | }; |
404 | ||
cfbf6377 | 405 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 406 | |
602adf40 | 407 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
408 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
409 | ||
432b8587 AE |
410 | static LIST_HEAD(rbd_client_list); /* clients */ |
411 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 412 | |
78c2a44a AE |
413 | /* Slab caches for frequently-allocated structures */ |
414 | ||
1c2a9dfe | 415 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 416 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 417 | |
9b60e70b | 418 | static int rbd_major; |
f8a22fc2 ID |
419 | static DEFINE_IDA(rbd_dev_id_ida); |
420 | ||
f5ee37bd ID |
421 | static struct workqueue_struct *rbd_wq; |
422 | ||
9b60e70b | 423 | /* |
3cfa3b16 | 424 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 425 | */ |
3cfa3b16 | 426 | static bool single_major = true; |
9b60e70b | 427 | module_param(single_major, bool, S_IRUGO); |
3cfa3b16 | 428 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 429 | |
f0f8cef5 AE |
430 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
431 | size_t count); | |
432 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
433 | size_t count); | |
9b60e70b ID |
434 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
435 | size_t count); | |
436 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
437 | size_t count); | |
6d69bb53 | 438 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
f0f8cef5 | 439 | |
9b60e70b ID |
440 | static int rbd_dev_id_to_minor(int dev_id) |
441 | { | |
7e513d43 | 442 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
443 | } |
444 | ||
445 | static int minor_to_rbd_dev_id(int minor) | |
446 | { | |
7e513d43 | 447 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
448 | } |
449 | ||
ed95b21a ID |
450 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
451 | { | |
452 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
453 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
454 | } | |
455 | ||
456 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
457 | { | |
458 | bool is_lock_owner; | |
459 | ||
460 | down_read(&rbd_dev->lock_rwsem); | |
461 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
462 | up_read(&rbd_dev->lock_rwsem); | |
463 | return is_lock_owner; | |
464 | } | |
465 | ||
8767b293 ID |
466 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
467 | { | |
468 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
469 | } | |
470 | ||
b15a21dd GKH |
471 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
472 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
473 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
474 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
8767b293 | 475 | static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL); |
b15a21dd GKH |
476 | |
477 | static struct attribute *rbd_bus_attrs[] = { | |
478 | &bus_attr_add.attr, | |
479 | &bus_attr_remove.attr, | |
9b60e70b ID |
480 | &bus_attr_add_single_major.attr, |
481 | &bus_attr_remove_single_major.attr, | |
8767b293 | 482 | &bus_attr_supported_features.attr, |
b15a21dd | 483 | NULL, |
f0f8cef5 | 484 | }; |
92c76dc0 ID |
485 | |
486 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
487 | struct attribute *attr, int index) | |
488 | { | |
9b60e70b ID |
489 | if (!single_major && |
490 | (attr == &bus_attr_add_single_major.attr || | |
491 | attr == &bus_attr_remove_single_major.attr)) | |
492 | return 0; | |
493 | ||
92c76dc0 ID |
494 | return attr->mode; |
495 | } | |
496 | ||
497 | static const struct attribute_group rbd_bus_group = { | |
498 | .attrs = rbd_bus_attrs, | |
499 | .is_visible = rbd_bus_is_visible, | |
500 | }; | |
501 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
502 | |
503 | static struct bus_type rbd_bus_type = { | |
504 | .name = "rbd", | |
b15a21dd | 505 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
506 | }; |
507 | ||
508 | static void rbd_root_dev_release(struct device *dev) | |
509 | { | |
510 | } | |
511 | ||
512 | static struct device rbd_root_dev = { | |
513 | .init_name = "rbd", | |
514 | .release = rbd_root_dev_release, | |
515 | }; | |
516 | ||
06ecc6cb AE |
517 | static __printf(2, 3) |
518 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
519 | { | |
520 | struct va_format vaf; | |
521 | va_list args; | |
522 | ||
523 | va_start(args, fmt); | |
524 | vaf.fmt = fmt; | |
525 | vaf.va = &args; | |
526 | ||
527 | if (!rbd_dev) | |
528 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
529 | else if (rbd_dev->disk) | |
530 | printk(KERN_WARNING "%s: %s: %pV\n", | |
531 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
532 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
533 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
534 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
535 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
536 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
537 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
538 | else /* punt */ | |
539 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
540 | RBD_DRV_NAME, rbd_dev, &vaf); | |
541 | va_end(args); | |
542 | } | |
543 | ||
aafb230e AE |
544 | #ifdef RBD_DEBUG |
545 | #define rbd_assert(expr) \ | |
546 | if (unlikely(!(expr))) { \ | |
547 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
548 | "at line %d:\n\n" \ | |
549 | "\trbd_assert(%s);\n\n", \ | |
550 | __func__, __LINE__, #expr); \ | |
551 | BUG(); \ | |
552 | } | |
553 | #else /* !RBD_DEBUG */ | |
554 | # define rbd_assert(expr) ((void) 0) | |
555 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 556 | |
05a46afd | 557 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 558 | |
cc4a38bd | 559 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 560 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 561 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 562 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
563 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
564 | u64 snap_id); | |
2ad3d716 AE |
565 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
566 | u8 *order, u64 *snap_size); | |
567 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
568 | u64 *snap_features); | |
59c2be1e | 569 | |
602adf40 YS |
570 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
571 | { | |
f0f8cef5 | 572 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 573 | bool removing = false; |
602adf40 | 574 | |
a14ea269 | 575 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
576 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
577 | removing = true; | |
578 | else | |
579 | rbd_dev->open_count++; | |
a14ea269 | 580 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
581 | if (removing) |
582 | return -ENOENT; | |
583 | ||
c3e946ce | 584 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 585 | |
602adf40 YS |
586 | return 0; |
587 | } | |
588 | ||
db2a144b | 589 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
590 | { |
591 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
592 | unsigned long open_count_before; |
593 | ||
a14ea269 | 594 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 595 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 596 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 597 | rbd_assert(open_count_before > 0); |
dfc5606d | 598 | |
c3e946ce | 599 | put_device(&rbd_dev->dev); |
dfc5606d YS |
600 | } |
601 | ||
131fd9f6 GZ |
602 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
603 | { | |
1de797bb | 604 | int ro; |
131fd9f6 | 605 | |
1de797bb | 606 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
607 | return -EFAULT; |
608 | ||
1de797bb | 609 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
610 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
611 | return -EROFS; | |
612 | ||
1de797bb ID |
613 | /* Let blkdev_roset() handle it */ |
614 | return -ENOTTY; | |
131fd9f6 GZ |
615 | } |
616 | ||
617 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
618 | unsigned int cmd, unsigned long arg) | |
619 | { | |
620 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 621 | int ret; |
131fd9f6 | 622 | |
131fd9f6 GZ |
623 | switch (cmd) { |
624 | case BLKROSET: | |
625 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
626 | break; | |
627 | default: | |
628 | ret = -ENOTTY; | |
629 | } | |
630 | ||
131fd9f6 GZ |
631 | return ret; |
632 | } | |
633 | ||
634 | #ifdef CONFIG_COMPAT | |
635 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
636 | unsigned int cmd, unsigned long arg) | |
637 | { | |
638 | return rbd_ioctl(bdev, mode, cmd, arg); | |
639 | } | |
640 | #endif /* CONFIG_COMPAT */ | |
641 | ||
602adf40 YS |
642 | static const struct block_device_operations rbd_bd_ops = { |
643 | .owner = THIS_MODULE, | |
644 | .open = rbd_open, | |
dfc5606d | 645 | .release = rbd_release, |
131fd9f6 GZ |
646 | .ioctl = rbd_ioctl, |
647 | #ifdef CONFIG_COMPAT | |
648 | .compat_ioctl = rbd_compat_ioctl, | |
649 | #endif | |
602adf40 YS |
650 | }; |
651 | ||
652 | /* | |
7262cfca | 653 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 654 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 655 | */ |
f8c38929 | 656 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
657 | { |
658 | struct rbd_client *rbdc; | |
659 | int ret = -ENOMEM; | |
660 | ||
37206ee5 | 661 | dout("%s:\n", __func__); |
602adf40 YS |
662 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
663 | if (!rbdc) | |
664 | goto out_opt; | |
665 | ||
666 | kref_init(&rbdc->kref); | |
667 | INIT_LIST_HEAD(&rbdc->node); | |
668 | ||
74da4a0f | 669 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 670 | if (IS_ERR(rbdc->client)) |
08f75463 | 671 | goto out_rbdc; |
43ae4701 | 672 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
673 | |
674 | ret = ceph_open_session(rbdc->client); | |
675 | if (ret < 0) | |
08f75463 | 676 | goto out_client; |
602adf40 | 677 | |
432b8587 | 678 | spin_lock(&rbd_client_list_lock); |
602adf40 | 679 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 680 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 681 | |
37206ee5 | 682 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 683 | |
602adf40 | 684 | return rbdc; |
08f75463 | 685 | out_client: |
602adf40 | 686 | ceph_destroy_client(rbdc->client); |
08f75463 | 687 | out_rbdc: |
602adf40 YS |
688 | kfree(rbdc); |
689 | out_opt: | |
43ae4701 AE |
690 | if (ceph_opts) |
691 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
692 | dout("%s: error %d\n", __func__, ret); |
693 | ||
28f259b7 | 694 | return ERR_PTR(ret); |
602adf40 YS |
695 | } |
696 | ||
2f82ee54 AE |
697 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
698 | { | |
699 | kref_get(&rbdc->kref); | |
700 | ||
701 | return rbdc; | |
702 | } | |
703 | ||
602adf40 | 704 | /* |
1f7ba331 AE |
705 | * Find a ceph client with specific addr and configuration. If |
706 | * found, bump its reference count. | |
602adf40 | 707 | */ |
1f7ba331 | 708 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
709 | { |
710 | struct rbd_client *client_node; | |
1f7ba331 | 711 | bool found = false; |
602adf40 | 712 | |
43ae4701 | 713 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
714 | return NULL; |
715 | ||
1f7ba331 AE |
716 | spin_lock(&rbd_client_list_lock); |
717 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
718 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
719 | __rbd_get_client(client_node); |
720 | ||
1f7ba331 AE |
721 | found = true; |
722 | break; | |
723 | } | |
724 | } | |
725 | spin_unlock(&rbd_client_list_lock); | |
726 | ||
727 | return found ? client_node : NULL; | |
602adf40 YS |
728 | } |
729 | ||
59c2be1e | 730 | /* |
210c104c | 731 | * (Per device) rbd map options |
59c2be1e YS |
732 | */ |
733 | enum { | |
b5584180 | 734 | Opt_queue_depth, |
34f55d0b | 735 | Opt_lock_timeout, |
59c2be1e YS |
736 | Opt_last_int, |
737 | /* int args above */ | |
738 | Opt_last_string, | |
739 | /* string args above */ | |
cc0538b6 AE |
740 | Opt_read_only, |
741 | Opt_read_write, | |
80de1912 | 742 | Opt_lock_on_read, |
e010dd0a | 743 | Opt_exclusive, |
d9360540 | 744 | Opt_notrim, |
210c104c | 745 | Opt_err |
59c2be1e YS |
746 | }; |
747 | ||
43ae4701 | 748 | static match_table_t rbd_opts_tokens = { |
b5584180 | 749 | {Opt_queue_depth, "queue_depth=%d"}, |
34f55d0b | 750 | {Opt_lock_timeout, "lock_timeout=%d"}, |
59c2be1e YS |
751 | /* int args above */ |
752 | /* string args above */ | |
be466c1c | 753 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
754 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
755 | {Opt_read_write, "read_write"}, | |
756 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 757 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 758 | {Opt_exclusive, "exclusive"}, |
d9360540 | 759 | {Opt_notrim, "notrim"}, |
210c104c | 760 | {Opt_err, NULL} |
59c2be1e YS |
761 | }; |
762 | ||
98571b5a | 763 | struct rbd_options { |
b5584180 | 764 | int queue_depth; |
34f55d0b | 765 | unsigned long lock_timeout; |
98571b5a | 766 | bool read_only; |
80de1912 | 767 | bool lock_on_read; |
e010dd0a | 768 | bool exclusive; |
d9360540 | 769 | bool trim; |
98571b5a AE |
770 | }; |
771 | ||
b5584180 | 772 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
34f55d0b | 773 | #define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
98571b5a | 774 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 775 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 776 | #define RBD_EXCLUSIVE_DEFAULT false |
d9360540 | 777 | #define RBD_TRIM_DEFAULT true |
98571b5a | 778 | |
59c2be1e YS |
779 | static int parse_rbd_opts_token(char *c, void *private) |
780 | { | |
43ae4701 | 781 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
782 | substring_t argstr[MAX_OPT_ARGS]; |
783 | int token, intval, ret; | |
784 | ||
43ae4701 | 785 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
786 | if (token < Opt_last_int) { |
787 | ret = match_int(&argstr[0], &intval); | |
788 | if (ret < 0) { | |
210c104c | 789 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
790 | return ret; |
791 | } | |
792 | dout("got int token %d val %d\n", token, intval); | |
793 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 794 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
795 | } else { |
796 | dout("got token %d\n", token); | |
797 | } | |
798 | ||
799 | switch (token) { | |
b5584180 ID |
800 | case Opt_queue_depth: |
801 | if (intval < 1) { | |
802 | pr_err("queue_depth out of range\n"); | |
803 | return -EINVAL; | |
804 | } | |
805 | rbd_opts->queue_depth = intval; | |
806 | break; | |
34f55d0b DY |
807 | case Opt_lock_timeout: |
808 | /* 0 is "wait forever" (i.e. infinite timeout) */ | |
809 | if (intval < 0 || intval > INT_MAX / 1000) { | |
810 | pr_err("lock_timeout out of range\n"); | |
811 | return -EINVAL; | |
812 | } | |
813 | rbd_opts->lock_timeout = msecs_to_jiffies(intval * 1000); | |
814 | break; | |
cc0538b6 AE |
815 | case Opt_read_only: |
816 | rbd_opts->read_only = true; | |
817 | break; | |
818 | case Opt_read_write: | |
819 | rbd_opts->read_only = false; | |
820 | break; | |
80de1912 ID |
821 | case Opt_lock_on_read: |
822 | rbd_opts->lock_on_read = true; | |
823 | break; | |
e010dd0a ID |
824 | case Opt_exclusive: |
825 | rbd_opts->exclusive = true; | |
826 | break; | |
d9360540 ID |
827 | case Opt_notrim: |
828 | rbd_opts->trim = false; | |
829 | break; | |
59c2be1e | 830 | default: |
210c104c ID |
831 | /* libceph prints "bad option" msg */ |
832 | return -EINVAL; | |
59c2be1e | 833 | } |
210c104c | 834 | |
59c2be1e YS |
835 | return 0; |
836 | } | |
837 | ||
6d2940c8 GZ |
838 | static char* obj_op_name(enum obj_operation_type op_type) |
839 | { | |
840 | switch (op_type) { | |
841 | case OBJ_OP_READ: | |
842 | return "read"; | |
843 | case OBJ_OP_WRITE: | |
844 | return "write"; | |
90e98c52 GZ |
845 | case OBJ_OP_DISCARD: |
846 | return "discard"; | |
6d2940c8 GZ |
847 | default: |
848 | return "???"; | |
849 | } | |
850 | } | |
851 | ||
602adf40 YS |
852 | /* |
853 | * Destroy ceph client | |
d23a4b3f | 854 | * |
432b8587 | 855 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
856 | */ |
857 | static void rbd_client_release(struct kref *kref) | |
858 | { | |
859 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
860 | ||
37206ee5 | 861 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 862 | spin_lock(&rbd_client_list_lock); |
602adf40 | 863 | list_del(&rbdc->node); |
cd9d9f5d | 864 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
865 | |
866 | ceph_destroy_client(rbdc->client); | |
867 | kfree(rbdc); | |
868 | } | |
869 | ||
870 | /* | |
871 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
872 | * it. | |
873 | */ | |
9d3997fd | 874 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 875 | { |
c53d5893 AE |
876 | if (rbdc) |
877 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
878 | } |
879 | ||
dd435855 ID |
880 | static int wait_for_latest_osdmap(struct ceph_client *client) |
881 | { | |
882 | u64 newest_epoch; | |
883 | int ret; | |
884 | ||
885 | ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch); | |
886 | if (ret) | |
887 | return ret; | |
888 | ||
889 | if (client->osdc.osdmap->epoch >= newest_epoch) | |
890 | return 0; | |
891 | ||
892 | ceph_osdc_maybe_request_map(&client->osdc); | |
893 | return ceph_monc_wait_osdmap(&client->monc, newest_epoch, | |
894 | client->options->mount_timeout); | |
895 | } | |
896 | ||
5feb0d8d ID |
897 | /* |
898 | * Get a ceph client with specific addr and configuration, if one does | |
899 | * not exist create it. Either way, ceph_opts is consumed by this | |
900 | * function. | |
901 | */ | |
902 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) | |
903 | { | |
904 | struct rbd_client *rbdc; | |
dd435855 | 905 | int ret; |
5feb0d8d ID |
906 | |
907 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); | |
908 | rbdc = rbd_client_find(ceph_opts); | |
dd435855 | 909 | if (rbdc) { |
5feb0d8d | 910 | ceph_destroy_options(ceph_opts); |
dd435855 ID |
911 | |
912 | /* | |
913 | * Using an existing client. Make sure ->pg_pools is up to | |
914 | * date before we look up the pool id in do_rbd_add(). | |
915 | */ | |
916 | ret = wait_for_latest_osdmap(rbdc->client); | |
917 | if (ret) { | |
918 | rbd_warn(NULL, "failed to get latest osdmap: %d", ret); | |
919 | rbd_put_client(rbdc); | |
920 | rbdc = ERR_PTR(ret); | |
921 | } | |
922 | } else { | |
5feb0d8d | 923 | rbdc = rbd_client_create(ceph_opts); |
dd435855 | 924 | } |
5feb0d8d ID |
925 | mutex_unlock(&client_mutex); |
926 | ||
927 | return rbdc; | |
928 | } | |
929 | ||
a30b71b9 AE |
930 | static bool rbd_image_format_valid(u32 image_format) |
931 | { | |
932 | return image_format == 1 || image_format == 2; | |
933 | } | |
934 | ||
8e94af8e AE |
935 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
936 | { | |
103a150f AE |
937 | size_t size; |
938 | u32 snap_count; | |
939 | ||
940 | /* The header has to start with the magic rbd header text */ | |
941 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
942 | return false; | |
943 | ||
db2388b6 AE |
944 | /* The bio layer requires at least sector-sized I/O */ |
945 | ||
946 | if (ondisk->options.order < SECTOR_SHIFT) | |
947 | return false; | |
948 | ||
949 | /* If we use u64 in a few spots we may be able to loosen this */ | |
950 | ||
951 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
952 | return false; | |
953 | ||
103a150f AE |
954 | /* |
955 | * The size of a snapshot header has to fit in a size_t, and | |
956 | * that limits the number of snapshots. | |
957 | */ | |
958 | snap_count = le32_to_cpu(ondisk->snap_count); | |
959 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
960 | if (snap_count > size / sizeof (__le64)) | |
961 | return false; | |
962 | ||
963 | /* | |
964 | * Not only that, but the size of the entire the snapshot | |
965 | * header must also be representable in a size_t. | |
966 | */ | |
967 | size -= snap_count * sizeof (__le64); | |
968 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
969 | return false; | |
970 | ||
971 | return true; | |
8e94af8e AE |
972 | } |
973 | ||
5bc3fb17 ID |
974 | /* |
975 | * returns the size of an object in the image | |
976 | */ | |
977 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
978 | { | |
979 | return 1U << header->obj_order; | |
980 | } | |
981 | ||
263423f8 ID |
982 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
983 | { | |
984 | if (rbd_dev->header.stripe_unit == 0 || | |
985 | rbd_dev->header.stripe_count == 0) { | |
986 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
987 | rbd_dev->header.stripe_count = 1; | |
988 | } | |
989 | ||
990 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
991 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
992 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
993 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
994 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
995 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
996 | } | |
997 | ||
602adf40 | 998 | /* |
bb23e37a AE |
999 | * Fill an rbd image header with information from the given format 1 |
1000 | * on-disk header. | |
602adf40 | 1001 | */ |
662518b1 | 1002 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 1003 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 1004 | { |
662518b1 | 1005 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
1006 | bool first_time = header->object_prefix == NULL; |
1007 | struct ceph_snap_context *snapc; | |
1008 | char *object_prefix = NULL; | |
1009 | char *snap_names = NULL; | |
1010 | u64 *snap_sizes = NULL; | |
ccece235 | 1011 | u32 snap_count; |
bb23e37a | 1012 | int ret = -ENOMEM; |
621901d6 | 1013 | u32 i; |
602adf40 | 1014 | |
bb23e37a | 1015 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1016 | |
bb23e37a | 1017 | if (first_time) { |
848d796c ID |
1018 | object_prefix = kstrndup(ondisk->object_prefix, |
1019 | sizeof(ondisk->object_prefix), | |
1020 | GFP_KERNEL); | |
bb23e37a AE |
1021 | if (!object_prefix) |
1022 | return -ENOMEM; | |
bb23e37a | 1023 | } |
00f1f36f | 1024 | |
bb23e37a | 1025 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1026 | |
bb23e37a AE |
1027 | snap_count = le32_to_cpu(ondisk->snap_count); |
1028 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1029 | if (!snapc) | |
1030 | goto out_err; | |
1031 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1032 | if (snap_count) { |
bb23e37a | 1033 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1034 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1035 | ||
bb23e37a | 1036 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1037 | |
bb23e37a AE |
1038 | if (snap_names_len > (u64)SIZE_MAX) |
1039 | goto out_2big; | |
1040 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1041 | if (!snap_names) | |
6a52325f AE |
1042 | goto out_err; |
1043 | ||
bb23e37a | 1044 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1045 | snap_sizes = kmalloc_array(snap_count, |
1046 | sizeof(*header->snap_sizes), | |
1047 | GFP_KERNEL); | |
bb23e37a | 1048 | if (!snap_sizes) |
6a52325f | 1049 | goto out_err; |
bb23e37a | 1050 | |
f785cc1d | 1051 | /* |
bb23e37a AE |
1052 | * Copy the names, and fill in each snapshot's id |
1053 | * and size. | |
1054 | * | |
99a41ebc | 1055 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1056 | * ondisk buffer we're working with has |
f785cc1d AE |
1057 | * snap_names_len bytes beyond the end of the |
1058 | * snapshot id array, this memcpy() is safe. | |
1059 | */ | |
bb23e37a AE |
1060 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1061 | snaps = ondisk->snaps; | |
1062 | for (i = 0; i < snap_count; i++) { | |
1063 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1064 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1065 | } | |
602adf40 | 1066 | } |
6a52325f | 1067 | |
bb23e37a | 1068 | /* We won't fail any more, fill in the header */ |
621901d6 | 1069 | |
bb23e37a AE |
1070 | if (first_time) { |
1071 | header->object_prefix = object_prefix; | |
1072 | header->obj_order = ondisk->options.order; | |
263423f8 | 1073 | rbd_init_layout(rbd_dev); |
602adf40 | 1074 | } else { |
662518b1 AE |
1075 | ceph_put_snap_context(header->snapc); |
1076 | kfree(header->snap_names); | |
1077 | kfree(header->snap_sizes); | |
602adf40 | 1078 | } |
849b4260 | 1079 | |
bb23e37a | 1080 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1081 | |
f84344f3 | 1082 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1083 | header->snapc = snapc; |
1084 | header->snap_names = snap_names; | |
1085 | header->snap_sizes = snap_sizes; | |
468521c1 | 1086 | |
602adf40 | 1087 | return 0; |
bb23e37a AE |
1088 | out_2big: |
1089 | ret = -EIO; | |
6a52325f | 1090 | out_err: |
bb23e37a AE |
1091 | kfree(snap_sizes); |
1092 | kfree(snap_names); | |
1093 | ceph_put_snap_context(snapc); | |
1094 | kfree(object_prefix); | |
ccece235 | 1095 | |
bb23e37a | 1096 | return ret; |
602adf40 YS |
1097 | } |
1098 | ||
9682fc6d AE |
1099 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1100 | { | |
1101 | const char *snap_name; | |
1102 | ||
1103 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1104 | ||
1105 | /* Skip over names until we find the one we are looking for */ | |
1106 | ||
1107 | snap_name = rbd_dev->header.snap_names; | |
1108 | while (which--) | |
1109 | snap_name += strlen(snap_name) + 1; | |
1110 | ||
1111 | return kstrdup(snap_name, GFP_KERNEL); | |
1112 | } | |
1113 | ||
30d1cff8 AE |
1114 | /* |
1115 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1116 | * Note that result is for snapshots in *descending* order. | |
1117 | */ | |
1118 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1119 | { | |
1120 | u64 snap_id1 = *(u64 *)s1; | |
1121 | u64 snap_id2 = *(u64 *)s2; | |
1122 | ||
1123 | if (snap_id1 < snap_id2) | |
1124 | return 1; | |
1125 | return snap_id1 == snap_id2 ? 0 : -1; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Search a snapshot context to see if the given snapshot id is | |
1130 | * present. | |
1131 | * | |
1132 | * Returns the position of the snapshot id in the array if it's found, | |
1133 | * or BAD_SNAP_INDEX otherwise. | |
1134 | * | |
1135 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1136 | * reverse order, highest snapshot id first. | |
1137 | */ | |
9682fc6d AE |
1138 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1139 | { | |
1140 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1141 | u64 *found; |
9682fc6d | 1142 | |
30d1cff8 AE |
1143 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1144 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1145 | |
30d1cff8 | 1146 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1147 | } |
1148 | ||
2ad3d716 AE |
1149 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1150 | u64 snap_id) | |
9e15b77d | 1151 | { |
54cac61f | 1152 | u32 which; |
da6a6b63 | 1153 | const char *snap_name; |
9e15b77d | 1154 | |
54cac61f AE |
1155 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1156 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1157 | return ERR_PTR(-ENOENT); |
54cac61f | 1158 | |
da6a6b63 JD |
1159 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1160 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1161 | } |
1162 | ||
1163 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1164 | { | |
9e15b77d AE |
1165 | if (snap_id == CEPH_NOSNAP) |
1166 | return RBD_SNAP_HEAD_NAME; | |
1167 | ||
54cac61f AE |
1168 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1169 | if (rbd_dev->image_format == 1) | |
1170 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1171 | |
54cac61f | 1172 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1173 | } |
1174 | ||
2ad3d716 AE |
1175 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1176 | u64 *snap_size) | |
602adf40 | 1177 | { |
2ad3d716 AE |
1178 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1179 | if (snap_id == CEPH_NOSNAP) { | |
1180 | *snap_size = rbd_dev->header.image_size; | |
1181 | } else if (rbd_dev->image_format == 1) { | |
1182 | u32 which; | |
602adf40 | 1183 | |
2ad3d716 AE |
1184 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1185 | if (which == BAD_SNAP_INDEX) | |
1186 | return -ENOENT; | |
e86924a8 | 1187 | |
2ad3d716 AE |
1188 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1189 | } else { | |
1190 | u64 size = 0; | |
1191 | int ret; | |
1192 | ||
1193 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1194 | if (ret) | |
1195 | return ret; | |
1196 | ||
1197 | *snap_size = size; | |
1198 | } | |
1199 | return 0; | |
602adf40 YS |
1200 | } |
1201 | ||
2ad3d716 AE |
1202 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1203 | u64 *snap_features) | |
602adf40 | 1204 | { |
2ad3d716 AE |
1205 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1206 | if (snap_id == CEPH_NOSNAP) { | |
1207 | *snap_features = rbd_dev->header.features; | |
1208 | } else if (rbd_dev->image_format == 1) { | |
1209 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1210 | } else { |
2ad3d716 AE |
1211 | u64 features = 0; |
1212 | int ret; | |
8b0241f8 | 1213 | |
2ad3d716 AE |
1214 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1215 | if (ret) | |
1216 | return ret; | |
1217 | ||
1218 | *snap_features = features; | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1224 | { | |
8f4b7d98 | 1225 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1226 | u64 size = 0; |
1227 | u64 features = 0; | |
1228 | int ret; | |
1229 | ||
2ad3d716 AE |
1230 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1231 | if (ret) | |
1232 | return ret; | |
1233 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1234 | if (ret) | |
1235 | return ret; | |
1236 | ||
1237 | rbd_dev->mapping.size = size; | |
1238 | rbd_dev->mapping.features = features; | |
1239 | ||
8b0241f8 | 1240 | return 0; |
602adf40 YS |
1241 | } |
1242 | ||
d1cf5788 AE |
1243 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1244 | { | |
1245 | rbd_dev->mapping.size = 0; | |
1246 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1247 | } |
1248 | ||
5359a17d | 1249 | static void zero_bvec(struct bio_vec *bv) |
602adf40 | 1250 | { |
602adf40 | 1251 | void *buf; |
5359a17d | 1252 | unsigned long flags; |
602adf40 | 1253 | |
5359a17d ID |
1254 | buf = bvec_kmap_irq(bv, &flags); |
1255 | memset(buf, 0, bv->bv_len); | |
1256 | flush_dcache_page(bv->bv_page); | |
1257 | bvec_kunmap_irq(buf, &flags); | |
602adf40 YS |
1258 | } |
1259 | ||
5359a17d | 1260 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
b9434c5b | 1261 | { |
5359a17d | 1262 | struct ceph_bio_iter it = *bio_pos; |
b9434c5b | 1263 | |
5359a17d ID |
1264 | ceph_bio_iter_advance(&it, off); |
1265 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1266 | zero_bvec(&bv); | |
1267 | })); | |
b9434c5b AE |
1268 | } |
1269 | ||
7e07efb1 | 1270 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
602adf40 | 1271 | { |
7e07efb1 | 1272 | struct ceph_bvec_iter it = *bvec_pos; |
602adf40 | 1273 | |
7e07efb1 ID |
1274 | ceph_bvec_iter_advance(&it, off); |
1275 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1276 | zero_bvec(&bv); | |
1277 | })); | |
f7760dad AE |
1278 | } |
1279 | ||
1280 | /* | |
3da691bf | 1281 | * Zero a range in @obj_req data buffer defined by a bio (list) or |
afb97888 | 1282 | * (private) bio_vec array. |
f7760dad | 1283 | * |
3da691bf | 1284 | * @off is relative to the start of the data buffer. |
926f9b3f | 1285 | */ |
3da691bf ID |
1286 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
1287 | u32 bytes) | |
926f9b3f | 1288 | { |
ecc633ca | 1289 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1290 | case OBJ_REQUEST_BIO: |
1291 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1292 | break; | |
1293 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1294 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf ID |
1295 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
1296 | break; | |
1297 | default: | |
1298 | rbd_assert(0); | |
6365d33a AE |
1299 | } |
1300 | } | |
1301 | ||
bf0d5f50 AE |
1302 | static void rbd_obj_request_destroy(struct kref *kref); |
1303 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1304 | { | |
1305 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1306 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1307 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1308 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1309 | } | |
1310 | ||
0f2d5be7 AE |
1311 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1312 | { | |
1313 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1314 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1315 | kref_get(&img_request->kref); |
1316 | } | |
1317 | ||
bf0d5f50 AE |
1318 | static void rbd_img_request_destroy(struct kref *kref); |
1319 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1320 | { | |
1321 | rbd_assert(img_request != NULL); | |
37206ee5 | 1322 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1323 | kref_read(&img_request->kref)); |
e93aca0a | 1324 | kref_put(&img_request->kref, rbd_img_request_destroy); |
bf0d5f50 AE |
1325 | } |
1326 | ||
1327 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1328 | struct rbd_obj_request *obj_request) | |
1329 | { | |
25dcf954 AE |
1330 | rbd_assert(obj_request->img_request == NULL); |
1331 | ||
b155e86c | 1332 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1333 | obj_request->img_request = img_request; |
25dcf954 | 1334 | img_request->obj_request_count++; |
7114edac | 1335 | img_request->pending_count++; |
15961b44 | 1336 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
bf0d5f50 AE |
1337 | } |
1338 | ||
1339 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1340 | struct rbd_obj_request *obj_request) | |
1341 | { | |
15961b44 | 1342 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
43df3d35 | 1343 | list_del(&obj_request->ex.oe_item); |
25dcf954 AE |
1344 | rbd_assert(img_request->obj_request_count > 0); |
1345 | img_request->obj_request_count--; | |
bf0d5f50 | 1346 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 AE |
1347 | rbd_obj_request_put(obj_request); |
1348 | } | |
1349 | ||
980917fc | 1350 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1351 | { |
980917fc ID |
1352 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1353 | ||
a90bb0c1 | 1354 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
43df3d35 ID |
1355 | obj_request, obj_request->ex.oe_objno, obj_request->ex.oe_off, |
1356 | obj_request->ex.oe_len, osd_req); | |
980917fc | 1357 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1358 | } |
1359 | ||
0c425248 AE |
1360 | /* |
1361 | * The default/initial value for all image request flags is 0. Each | |
1362 | * is conditionally set to 1 at image request initialization time | |
1363 | * and currently never change thereafter. | |
1364 | */ | |
d0b2e944 AE |
1365 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1366 | { | |
1367 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1368 | smp_mb(); | |
1369 | } | |
1370 | ||
a2acd00e AE |
1371 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1372 | { | |
1373 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1374 | smp_mb(); | |
1375 | } | |
1376 | ||
d0b2e944 AE |
1377 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1378 | { | |
1379 | smp_mb(); | |
1380 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1381 | } | |
1382 | ||
3da691bf | 1383 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
6e2a4505 | 1384 | { |
3da691bf | 1385 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
b9434c5b | 1386 | |
43df3d35 ID |
1387 | return !obj_req->ex.oe_off && |
1388 | obj_req->ex.oe_len == rbd_dev->layout.object_size; | |
6e2a4505 AE |
1389 | } |
1390 | ||
3da691bf | 1391 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1392 | { |
3da691bf | 1393 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
bf0d5f50 | 1394 | |
43df3d35 | 1395 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
3da691bf | 1396 | rbd_dev->layout.object_size; |
0dcc685e ID |
1397 | } |
1398 | ||
86bd7998 | 1399 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1400 | { |
86bd7998 ID |
1401 | return ceph_file_extents_bytes(obj_req->img_extents, |
1402 | obj_req->num_img_extents); | |
bf0d5f50 AE |
1403 | } |
1404 | ||
3da691bf | 1405 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
bf0d5f50 | 1406 | { |
9bb0248d | 1407 | switch (img_req->op_type) { |
3da691bf ID |
1408 | case OBJ_OP_READ: |
1409 | return false; | |
1410 | case OBJ_OP_WRITE: | |
1411 | case OBJ_OP_DISCARD: | |
1412 | return true; | |
1413 | default: | |
c6244b3b | 1414 | BUG(); |
3da691bf | 1415 | } |
90e98c52 GZ |
1416 | } |
1417 | ||
3da691bf | 1418 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); |
2761713d | 1419 | |
85e084fe | 1420 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1421 | { |
3da691bf | 1422 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
bf0d5f50 | 1423 | |
3da691bf ID |
1424 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1425 | osd_req->r_result, obj_req); | |
1426 | rbd_assert(osd_req == obj_req->osd_req); | |
bf0d5f50 | 1427 | |
3da691bf ID |
1428 | obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0; |
1429 | if (!obj_req->result && !rbd_img_is_write(obj_req->img_request)) | |
1430 | obj_req->xferred = osd_req->r_result; | |
1431 | else | |
1432 | /* | |
1433 | * Writes aren't allowed to return a data payload. In some | |
1434 | * guarded write cases (e.g. stat + zero on an empty object) | |
1435 | * a stat response makes it through, but we don't care. | |
1436 | */ | |
1437 | obj_req->xferred = 0; | |
bf0d5f50 | 1438 | |
3da691bf | 1439 | rbd_obj_handle_request(obj_req); |
bf0d5f50 AE |
1440 | } |
1441 | ||
9d4df01f | 1442 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1443 | { |
8c042b0d | 1444 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1445 | |
a162b308 | 1446 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
7c84883a | 1447 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1448 | } |
1449 | ||
1450 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1451 | { | |
9d4df01f | 1452 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1453 | |
a162b308 | 1454 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
1134e091 | 1455 | ktime_get_real_ts(&osd_req->r_mtime); |
43df3d35 | 1456 | osd_req->r_data_offset = obj_request->ex.oe_off; |
430c28c3 AE |
1457 | } |
1458 | ||
bc81207e | 1459 | static struct ceph_osd_request * |
a162b308 | 1460 | rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops) |
bc81207e | 1461 | { |
a162b308 ID |
1462 | struct rbd_img_request *img_req = obj_req->img_request; |
1463 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
bc81207e ID |
1464 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1465 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1466 | const char *name_format = rbd_dev->image_format == 1 ? |
1467 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e | 1468 | |
a162b308 ID |
1469 | req = ceph_osdc_alloc_request(osdc, |
1470 | (rbd_img_is_write(img_req) ? img_req->snapc : NULL), | |
1471 | num_ops, false, GFP_NOIO); | |
bc81207e ID |
1472 | if (!req) |
1473 | return NULL; | |
1474 | ||
bc81207e | 1475 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1476 | req->r_priv = obj_req; |
bc81207e ID |
1477 | |
1478 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; | |
a90bb0c1 | 1479 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
43df3d35 | 1480 | rbd_dev->header.object_prefix, obj_req->ex.oe_objno)) |
bc81207e ID |
1481 | goto err_req; |
1482 | ||
1483 | if (ceph_osdc_alloc_messages(req, GFP_NOIO)) | |
1484 | goto err_req; | |
1485 | ||
1486 | return req; | |
1487 | ||
1488 | err_req: | |
1489 | ceph_osdc_put_request(req); | |
1490 | return NULL; | |
1491 | } | |
1492 | ||
bf0d5f50 AE |
1493 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1494 | { | |
1495 | ceph_osdc_put_request(osd_req); | |
1496 | } | |
1497 | ||
ecc633ca | 1498 | static struct rbd_obj_request *rbd_obj_request_create(void) |
bf0d5f50 AE |
1499 | { |
1500 | struct rbd_obj_request *obj_request; | |
bf0d5f50 | 1501 | |
5a60e876 | 1502 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1503 | if (!obj_request) |
f907ad55 | 1504 | return NULL; |
f907ad55 | 1505 | |
43df3d35 | 1506 | ceph_object_extent_init(&obj_request->ex); |
bf0d5f50 AE |
1507 | kref_init(&obj_request->kref); |
1508 | ||
67e2b652 | 1509 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1510 | return obj_request; |
1511 | } | |
1512 | ||
1513 | static void rbd_obj_request_destroy(struct kref *kref) | |
1514 | { | |
1515 | struct rbd_obj_request *obj_request; | |
7e07efb1 | 1516 | u32 i; |
bf0d5f50 AE |
1517 | |
1518 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1519 | ||
37206ee5 AE |
1520 | dout("%s: obj %p\n", __func__, obj_request); |
1521 | ||
bf0d5f50 AE |
1522 | if (obj_request->osd_req) |
1523 | rbd_osd_req_destroy(obj_request->osd_req); | |
1524 | ||
ecc633ca | 1525 | switch (obj_request->img_request->data_type) { |
9969ebc5 | 1526 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1527 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1528 | case OBJ_REQUEST_BVECS: |
5359a17d | 1529 | break; /* Nothing to do */ |
afb97888 ID |
1530 | case OBJ_REQUEST_OWN_BVECS: |
1531 | kfree(obj_request->bvec_pos.bvecs); | |
788e2df3 | 1532 | break; |
7e07efb1 ID |
1533 | default: |
1534 | rbd_assert(0); | |
bf0d5f50 AE |
1535 | } |
1536 | ||
86bd7998 | 1537 | kfree(obj_request->img_extents); |
7e07efb1 ID |
1538 | if (obj_request->copyup_bvecs) { |
1539 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1540 | if (obj_request->copyup_bvecs[i].bv_page) | |
1541 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1542 | } | |
1543 | kfree(obj_request->copyup_bvecs); | |
bf0d5f50 AE |
1544 | } |
1545 | ||
868311b1 | 1546 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1547 | } |
1548 | ||
fb65d228 AE |
1549 | /* It's OK to call this for a device with no parent */ |
1550 | ||
1551 | static void rbd_spec_put(struct rbd_spec *spec); | |
1552 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1553 | { | |
1554 | rbd_dev_remove_parent(rbd_dev); | |
1555 | rbd_spec_put(rbd_dev->parent_spec); | |
1556 | rbd_dev->parent_spec = NULL; | |
1557 | rbd_dev->parent_overlap = 0; | |
1558 | } | |
1559 | ||
a2acd00e AE |
1560 | /* |
1561 | * Parent image reference counting is used to determine when an | |
1562 | * image's parent fields can be safely torn down--after there are no | |
1563 | * more in-flight requests to the parent image. When the last | |
1564 | * reference is dropped, cleaning them up is safe. | |
1565 | */ | |
1566 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1567 | { | |
1568 | int counter; | |
1569 | ||
1570 | if (!rbd_dev->parent_spec) | |
1571 | return; | |
1572 | ||
1573 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1574 | if (counter > 0) | |
1575 | return; | |
1576 | ||
1577 | /* Last reference; clean up parent data structures */ | |
1578 | ||
1579 | if (!counter) | |
1580 | rbd_dev_unparent(rbd_dev); | |
1581 | else | |
9584d508 | 1582 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1583 | } |
1584 | ||
1585 | /* | |
1586 | * If an image has a non-zero parent overlap, get a reference to its | |
1587 | * parent. | |
1588 | * | |
1589 | * Returns true if the rbd device has a parent with a non-zero | |
1590 | * overlap and a reference for it was successfully taken, or | |
1591 | * false otherwise. | |
1592 | */ | |
1593 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1594 | { | |
ae43e9d0 | 1595 | int counter = 0; |
a2acd00e AE |
1596 | |
1597 | if (!rbd_dev->parent_spec) | |
1598 | return false; | |
1599 | ||
ae43e9d0 ID |
1600 | down_read(&rbd_dev->header_rwsem); |
1601 | if (rbd_dev->parent_overlap) | |
1602 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
1603 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
1604 | |
1605 | if (counter < 0) | |
9584d508 | 1606 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1607 | |
ae43e9d0 | 1608 | return counter > 0; |
a2acd00e AE |
1609 | } |
1610 | ||
bf0d5f50 AE |
1611 | /* |
1612 | * Caller is responsible for filling in the list of object requests | |
1613 | * that comprises the image request, and the Linux request pointer | |
1614 | * (if there is one). | |
1615 | */ | |
cc344fa1 AE |
1616 | static struct rbd_img_request *rbd_img_request_create( |
1617 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1618 | enum obj_operation_type op_type, |
4e752f0a | 1619 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
1620 | { |
1621 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1622 | |
a0c5895b | 1623 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
1624 | if (!img_request) |
1625 | return NULL; | |
1626 | ||
bf0d5f50 | 1627 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1628 | img_request->op_type = op_type; |
9bb0248d | 1629 | if (!rbd_img_is_write(img_request)) |
bf0d5f50 | 1630 | img_request->snap_id = rbd_dev->spec->snap_id; |
9bb0248d ID |
1631 | else |
1632 | img_request->snapc = snapc; | |
1633 | ||
a2acd00e | 1634 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 1635 | img_request_layered_set(img_request); |
a0c5895b | 1636 | |
bf0d5f50 | 1637 | spin_lock_init(&img_request->completion_lock); |
43df3d35 | 1638 | INIT_LIST_HEAD(&img_request->object_extents); |
bf0d5f50 AE |
1639 | kref_init(&img_request->kref); |
1640 | ||
dfd9875f ID |
1641 | dout("%s: rbd_dev %p %s -> img %p\n", __func__, rbd_dev, |
1642 | obj_op_name(op_type), img_request); | |
bf0d5f50 AE |
1643 | return img_request; |
1644 | } | |
1645 | ||
1646 | static void rbd_img_request_destroy(struct kref *kref) | |
1647 | { | |
1648 | struct rbd_img_request *img_request; | |
1649 | struct rbd_obj_request *obj_request; | |
1650 | struct rbd_obj_request *next_obj_request; | |
1651 | ||
1652 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1653 | ||
37206ee5 AE |
1654 | dout("%s: img %p\n", __func__, img_request); |
1655 | ||
bf0d5f50 AE |
1656 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1657 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1658 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1659 | |
a2acd00e AE |
1660 | if (img_request_layered_test(img_request)) { |
1661 | img_request_layered_clear(img_request); | |
1662 | rbd_dev_parent_put(img_request->rbd_dev); | |
1663 | } | |
1664 | ||
9bb0248d | 1665 | if (rbd_img_is_write(img_request)) |
812164f8 | 1666 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1667 | |
1c2a9dfe | 1668 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1669 | } |
1670 | ||
86bd7998 ID |
1671 | static void prune_extents(struct ceph_file_extent *img_extents, |
1672 | u32 *num_img_extents, u64 overlap) | |
e93f3152 | 1673 | { |
86bd7998 | 1674 | u32 cnt = *num_img_extents; |
e93f3152 | 1675 | |
86bd7998 ID |
1676 | /* drop extents completely beyond the overlap */ |
1677 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) | |
1678 | cnt--; | |
e93f3152 | 1679 | |
86bd7998 ID |
1680 | if (cnt) { |
1681 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; | |
e93f3152 | 1682 | |
86bd7998 ID |
1683 | /* trim final overlapping extent */ |
1684 | if (ex->fe_off + ex->fe_len > overlap) | |
1685 | ex->fe_len = overlap - ex->fe_off; | |
1686 | } | |
e93f3152 | 1687 | |
86bd7998 | 1688 | *num_img_extents = cnt; |
e93f3152 AE |
1689 | } |
1690 | ||
86bd7998 ID |
1691 | /* |
1692 | * Determine the byte range(s) covered by either just the object extent | |
1693 | * or the entire object in the parent image. | |
1694 | */ | |
1695 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, | |
1696 | bool entire) | |
e93f3152 | 1697 | { |
86bd7998 ID |
1698 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1699 | int ret; | |
e93f3152 | 1700 | |
86bd7998 ID |
1701 | if (!rbd_dev->parent_overlap) |
1702 | return 0; | |
e93f3152 | 1703 | |
86bd7998 ID |
1704 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
1705 | entire ? 0 : obj_req->ex.oe_off, | |
1706 | entire ? rbd_dev->layout.object_size : | |
1707 | obj_req->ex.oe_len, | |
1708 | &obj_req->img_extents, | |
1709 | &obj_req->num_img_extents); | |
1710 | if (ret) | |
1711 | return ret; | |
e93f3152 | 1712 | |
86bd7998 ID |
1713 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
1714 | rbd_dev->parent_overlap); | |
1715 | return 0; | |
e93f3152 AE |
1716 | } |
1717 | ||
3da691bf | 1718 | static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) |
1217857f | 1719 | { |
ecc633ca | 1720 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1721 | case OBJ_REQUEST_BIO: |
1722 | osd_req_op_extent_osd_data_bio(obj_req->osd_req, which, | |
1723 | &obj_req->bio_pos, | |
43df3d35 | 1724 | obj_req->ex.oe_len); |
3da691bf ID |
1725 | break; |
1726 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1727 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf | 1728 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
43df3d35 | 1729 | obj_req->ex.oe_len); |
afb97888 | 1730 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
3da691bf ID |
1731 | osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which, |
1732 | &obj_req->bvec_pos); | |
1733 | break; | |
1734 | default: | |
1735 | rbd_assert(0); | |
1217857f | 1736 | } |
3da691bf | 1737 | } |
1217857f | 1738 | |
3da691bf ID |
1739 | static int rbd_obj_setup_read(struct rbd_obj_request *obj_req) |
1740 | { | |
a162b308 | 1741 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); |
3da691bf ID |
1742 | if (!obj_req->osd_req) |
1743 | return -ENOMEM; | |
2a842aca | 1744 | |
3da691bf | 1745 | osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ, |
43df3d35 | 1746 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1747 | rbd_osd_req_setup_data(obj_req, 0); |
7ad18afa | 1748 | |
3da691bf ID |
1749 | rbd_osd_req_format_read(obj_req); |
1750 | return 0; | |
1751 | } | |
1752 | ||
1753 | static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req, | |
1754 | unsigned int which) | |
1755 | { | |
1756 | struct page **pages; | |
8b3e1a56 | 1757 | |
3da691bf ID |
1758 | /* |
1759 | * The response data for a STAT call consists of: | |
1760 | * le64 length; | |
1761 | * struct { | |
1762 | * le32 tv_sec; | |
1763 | * le32 tv_nsec; | |
1764 | * } mtime; | |
1765 | */ | |
1766 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
1767 | if (IS_ERR(pages)) | |
1768 | return PTR_ERR(pages); | |
1769 | ||
1770 | osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0); | |
1771 | osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages, | |
1772 | 8 + sizeof(struct ceph_timespec), | |
1773 | 0, false, true); | |
1774 | return 0; | |
1217857f AE |
1775 | } |
1776 | ||
3da691bf ID |
1777 | static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req, |
1778 | unsigned int which) | |
2169238d | 1779 | { |
3da691bf ID |
1780 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1781 | u16 opcode; | |
2169238d | 1782 | |
3da691bf ID |
1783 | osd_req_op_alloc_hint_init(obj_req->osd_req, which++, |
1784 | rbd_dev->layout.object_size, | |
1785 | rbd_dev->layout.object_size); | |
2169238d | 1786 | |
3da691bf ID |
1787 | if (rbd_obj_is_entire(obj_req)) |
1788 | opcode = CEPH_OSD_OP_WRITEFULL; | |
1789 | else | |
1790 | opcode = CEPH_OSD_OP_WRITE; | |
2169238d | 1791 | |
3da691bf | 1792 | osd_req_op_extent_init(obj_req->osd_req, which, opcode, |
43df3d35 | 1793 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1794 | rbd_osd_req_setup_data(obj_req, which++); |
2169238d | 1795 | |
3da691bf ID |
1796 | rbd_assert(which == obj_req->osd_req->r_num_ops); |
1797 | rbd_osd_req_format_write(obj_req); | |
1798 | } | |
2169238d | 1799 | |
3da691bf ID |
1800 | static int rbd_obj_setup_write(struct rbd_obj_request *obj_req) |
1801 | { | |
3da691bf ID |
1802 | unsigned int num_osd_ops, which = 0; |
1803 | int ret; | |
1804 | ||
86bd7998 ID |
1805 | /* reverse map the entire object onto the parent */ |
1806 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1807 | if (ret) | |
1808 | return ret; | |
1809 | ||
1810 | if (obj_req->num_img_extents) { | |
3da691bf ID |
1811 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1812 | num_osd_ops = 3; /* stat + setallochint + write/writefull */ | |
1813 | } else { | |
1814 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1815 | num_osd_ops = 2; /* setallochint + write/writefull */ | |
2169238d AE |
1816 | } |
1817 | ||
a162b308 | 1818 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1819 | if (!obj_req->osd_req) |
1820 | return -ENOMEM; | |
2169238d | 1821 | |
86bd7998 | 1822 | if (obj_req->num_img_extents) { |
3da691bf ID |
1823 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1824 | if (ret) | |
1825 | return ret; | |
1826 | } | |
1827 | ||
1828 | __rbd_obj_setup_write(obj_req, which); | |
1829 | return 0; | |
2169238d AE |
1830 | } |
1831 | ||
3da691bf ID |
1832 | static void __rbd_obj_setup_discard(struct rbd_obj_request *obj_req, |
1833 | unsigned int which) | |
1834 | { | |
3b434a2a JD |
1835 | u16 opcode; |
1836 | ||
3da691bf | 1837 | if (rbd_obj_is_entire(obj_req)) { |
86bd7998 | 1838 | if (obj_req->num_img_extents) { |
2bb1e56e ID |
1839 | osd_req_op_init(obj_req->osd_req, which++, |
1840 | CEPH_OSD_OP_CREATE, 0); | |
3b434a2a JD |
1841 | opcode = CEPH_OSD_OP_TRUNCATE; |
1842 | } else { | |
3da691bf ID |
1843 | osd_req_op_init(obj_req->osd_req, which++, |
1844 | CEPH_OSD_OP_DELETE, 0); | |
1845 | opcode = 0; | |
3b434a2a | 1846 | } |
3da691bf ID |
1847 | } else if (rbd_obj_is_tail(obj_req)) { |
1848 | opcode = CEPH_OSD_OP_TRUNCATE; | |
3b434a2a | 1849 | } else { |
3da691bf | 1850 | opcode = CEPH_OSD_OP_ZERO; |
3b434a2a JD |
1851 | } |
1852 | ||
3da691bf ID |
1853 | if (opcode) |
1854 | osd_req_op_extent_init(obj_req->osd_req, which++, opcode, | |
43df3d35 | 1855 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
3da691bf ID |
1856 | 0, 0); |
1857 | ||
1858 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
1859 | rbd_osd_req_format_write(obj_req); | |
3b434a2a JD |
1860 | } |
1861 | ||
3da691bf | 1862 | static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1863 | { |
3da691bf ID |
1864 | unsigned int num_osd_ops, which = 0; |
1865 | int ret; | |
37206ee5 | 1866 | |
86bd7998 ID |
1867 | /* reverse map the entire object onto the parent */ |
1868 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1869 | if (ret) | |
1870 | return ret; | |
f1a4739f | 1871 | |
3da691bf ID |
1872 | if (rbd_obj_is_entire(obj_req)) { |
1873 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2bb1e56e ID |
1874 | if (obj_req->num_img_extents) |
1875 | num_osd_ops = 2; /* create + truncate */ | |
1876 | else | |
1877 | num_osd_ops = 1; /* delete */ | |
3da691bf | 1878 | } else { |
86bd7998 | 1879 | if (obj_req->num_img_extents) { |
3da691bf ID |
1880 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1881 | num_osd_ops = 2; /* stat + truncate/zero */ | |
1882 | } else { | |
1883 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1884 | num_osd_ops = 1; /* truncate/zero */ | |
1885 | } | |
f1a4739f AE |
1886 | } |
1887 | ||
a162b308 | 1888 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1889 | if (!obj_req->osd_req) |
1890 | return -ENOMEM; | |
bf0d5f50 | 1891 | |
86bd7998 | 1892 | if (!rbd_obj_is_entire(obj_req) && obj_req->num_img_extents) { |
3da691bf ID |
1893 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1894 | if (ret) | |
1895 | return ret; | |
1896 | } | |
3b434a2a | 1897 | |
3da691bf ID |
1898 | __rbd_obj_setup_discard(obj_req, which); |
1899 | return 0; | |
1900 | } | |
9d4df01f | 1901 | |
3da691bf ID |
1902 | /* |
1903 | * For each object request in @img_req, allocate an OSD request, add | |
1904 | * individual OSD ops and prepare them for submission. The number of | |
1905 | * OSD ops depends on op_type and the overlap point (if any). | |
1906 | */ | |
1907 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
1908 | { | |
1909 | struct rbd_obj_request *obj_req; | |
1910 | int ret; | |
430c28c3 | 1911 | |
3da691bf | 1912 | for_each_obj_request(img_req, obj_req) { |
9bb0248d | 1913 | switch (img_req->op_type) { |
3da691bf ID |
1914 | case OBJ_OP_READ: |
1915 | ret = rbd_obj_setup_read(obj_req); | |
1916 | break; | |
1917 | case OBJ_OP_WRITE: | |
1918 | ret = rbd_obj_setup_write(obj_req); | |
1919 | break; | |
1920 | case OBJ_OP_DISCARD: | |
1921 | ret = rbd_obj_setup_discard(obj_req); | |
1922 | break; | |
1923 | default: | |
1924 | rbd_assert(0); | |
1925 | } | |
1926 | if (ret) | |
1927 | return ret; | |
bf0d5f50 AE |
1928 | } |
1929 | ||
1930 | return 0; | |
3da691bf | 1931 | } |
bf0d5f50 | 1932 | |
5a237819 ID |
1933 | union rbd_img_fill_iter { |
1934 | struct ceph_bio_iter bio_iter; | |
1935 | struct ceph_bvec_iter bvec_iter; | |
1936 | }; | |
bf0d5f50 | 1937 | |
5a237819 ID |
1938 | struct rbd_img_fill_ctx { |
1939 | enum obj_request_type pos_type; | |
1940 | union rbd_img_fill_iter *pos; | |
1941 | union rbd_img_fill_iter iter; | |
1942 | ceph_object_extent_fn_t set_pos_fn; | |
afb97888 ID |
1943 | ceph_object_extent_fn_t count_fn; |
1944 | ceph_object_extent_fn_t copy_fn; | |
5a237819 | 1945 | }; |
bf0d5f50 | 1946 | |
5a237819 | 1947 | static struct ceph_object_extent *alloc_object_extent(void *arg) |
0eefd470 | 1948 | { |
5a237819 ID |
1949 | struct rbd_img_request *img_req = arg; |
1950 | struct rbd_obj_request *obj_req; | |
0eefd470 | 1951 | |
5a237819 ID |
1952 | obj_req = rbd_obj_request_create(); |
1953 | if (!obj_req) | |
1954 | return NULL; | |
2761713d | 1955 | |
5a237819 ID |
1956 | rbd_img_obj_request_add(img_req, obj_req); |
1957 | return &obj_req->ex; | |
1958 | } | |
0eefd470 | 1959 | |
afb97888 ID |
1960 | /* |
1961 | * While su != os && sc == 1 is technically not fancy (it's the same | |
1962 | * layout as su == os && sc == 1), we can't use the nocopy path for it | |
1963 | * because ->set_pos_fn() should be called only once per object. | |
1964 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so | |
1965 | * treat su != os && sc == 1 as fancy. | |
1966 | */ | |
1967 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) | |
1968 | { | |
1969 | return l->stripe_unit != l->object_size; | |
1970 | } | |
0eefd470 | 1971 | |
afb97888 ID |
1972 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
1973 | struct ceph_file_extent *img_extents, | |
1974 | u32 num_img_extents, | |
1975 | struct rbd_img_fill_ctx *fctx) | |
1976 | { | |
1977 | u32 i; | |
1978 | int ret; | |
1979 | ||
1980 | img_req->data_type = fctx->pos_type; | |
0eefd470 AE |
1981 | |
1982 | /* | |
afb97888 ID |
1983 | * Create object requests and set each object request's starting |
1984 | * position in the provided bio (list) or bio_vec array. | |
0eefd470 | 1985 | */ |
afb97888 ID |
1986 | fctx->iter = *fctx->pos; |
1987 | for (i = 0; i < num_img_extents; i++) { | |
1988 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, | |
1989 | img_extents[i].fe_off, | |
1990 | img_extents[i].fe_len, | |
1991 | &img_req->object_extents, | |
1992 | alloc_object_extent, img_req, | |
1993 | fctx->set_pos_fn, &fctx->iter); | |
1994 | if (ret) | |
1995 | return ret; | |
1996 | } | |
0eefd470 | 1997 | |
afb97888 | 1998 | return __rbd_img_fill_request(img_req); |
0eefd470 AE |
1999 | } |
2000 | ||
5a237819 ID |
2001 | /* |
2002 | * Map a list of image extents to a list of object extents, create the | |
2003 | * corresponding object requests (normally each to a different object, | |
2004 | * but not always) and add them to @img_req. For each object request, | |
afb97888 | 2005 | * set up its data descriptor to point to the corresponding chunk(s) of |
5a237819 ID |
2006 | * @fctx->pos data buffer. |
2007 | * | |
afb97888 ID |
2008 | * Because ceph_file_to_extents() will merge adjacent object extents |
2009 | * together, each object request's data descriptor may point to multiple | |
2010 | * different chunks of @fctx->pos data buffer. | |
2011 | * | |
5a237819 ID |
2012 | * @fctx->pos data buffer is assumed to be large enough. |
2013 | */ | |
2014 | static int rbd_img_fill_request(struct rbd_img_request *img_req, | |
2015 | struct ceph_file_extent *img_extents, | |
2016 | u32 num_img_extents, | |
2017 | struct rbd_img_fill_ctx *fctx) | |
3d7efd18 | 2018 | { |
afb97888 ID |
2019 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
2020 | struct rbd_obj_request *obj_req; | |
5a237819 ID |
2021 | u32 i; |
2022 | int ret; | |
2023 | ||
afb97888 ID |
2024 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
2025 | !rbd_layout_is_fancy(&rbd_dev->layout)) | |
2026 | return rbd_img_fill_request_nocopy(img_req, img_extents, | |
2027 | num_img_extents, fctx); | |
3d7efd18 | 2028 | |
afb97888 | 2029 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
0eefd470 | 2030 | |
bbea1c1a | 2031 | /* |
afb97888 ID |
2032 | * Create object requests and determine ->bvec_count for each object |
2033 | * request. Note that ->bvec_count sum over all object requests may | |
2034 | * be greater than the number of bio_vecs in the provided bio (list) | |
2035 | * or bio_vec array because when mapped, those bio_vecs can straddle | |
2036 | * stripe unit boundaries. | |
bbea1c1a | 2037 | */ |
5a237819 ID |
2038 | fctx->iter = *fctx->pos; |
2039 | for (i = 0; i < num_img_extents; i++) { | |
afb97888 | 2040 | ret = ceph_file_to_extents(&rbd_dev->layout, |
5a237819 ID |
2041 | img_extents[i].fe_off, |
2042 | img_extents[i].fe_len, | |
2043 | &img_req->object_extents, | |
2044 | alloc_object_extent, img_req, | |
afb97888 ID |
2045 | fctx->count_fn, &fctx->iter); |
2046 | if (ret) | |
2047 | return ret; | |
bbea1c1a | 2048 | } |
0eefd470 | 2049 | |
afb97888 ID |
2050 | for_each_obj_request(img_req, obj_req) { |
2051 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, | |
2052 | sizeof(*obj_req->bvec_pos.bvecs), | |
2053 | GFP_NOIO); | |
2054 | if (!obj_req->bvec_pos.bvecs) | |
2055 | return -ENOMEM; | |
2056 | } | |
0eefd470 | 2057 | |
8785b1d4 | 2058 | /* |
afb97888 ID |
2059 | * Fill in each object request's private bio_vec array, splitting and |
2060 | * rearranging the provided bio_vecs in stripe unit chunks as needed. | |
8785b1d4 | 2061 | */ |
afb97888 ID |
2062 | fctx->iter = *fctx->pos; |
2063 | for (i = 0; i < num_img_extents; i++) { | |
2064 | ret = ceph_iterate_extents(&rbd_dev->layout, | |
2065 | img_extents[i].fe_off, | |
2066 | img_extents[i].fe_len, | |
2067 | &img_req->object_extents, | |
2068 | fctx->copy_fn, &fctx->iter); | |
5a237819 ID |
2069 | if (ret) |
2070 | return ret; | |
2071 | } | |
3d7efd18 | 2072 | |
5a237819 ID |
2073 | return __rbd_img_fill_request(img_req); |
2074 | } | |
2075 | ||
2076 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, | |
2077 | u64 off, u64 len) | |
2078 | { | |
2079 | struct ceph_file_extent ex = { off, len }; | |
2080 | union rbd_img_fill_iter dummy; | |
2081 | struct rbd_img_fill_ctx fctx = { | |
2082 | .pos_type = OBJ_REQUEST_NODATA, | |
2083 | .pos = &dummy, | |
2084 | }; | |
2085 | ||
2086 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); | |
2087 | } | |
2088 | ||
2089 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2090 | { | |
2091 | struct rbd_obj_request *obj_req = | |
2092 | container_of(ex, struct rbd_obj_request, ex); | |
2093 | struct ceph_bio_iter *it = arg; | |
3d7efd18 | 2094 | |
5a237819 ID |
2095 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2096 | obj_req->bio_pos = *it; | |
2097 | ceph_bio_iter_advance(it, bytes); | |
2098 | } | |
3d7efd18 | 2099 | |
afb97888 ID |
2100 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2101 | { | |
2102 | struct rbd_obj_request *obj_req = | |
2103 | container_of(ex, struct rbd_obj_request, ex); | |
2104 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2105 | |
afb97888 ID |
2106 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2107 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2108 | obj_req->bvec_count++; | |
2109 | })); | |
0eefd470 | 2110 | |
afb97888 | 2111 | } |
0eefd470 | 2112 | |
afb97888 ID |
2113 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2114 | { | |
2115 | struct rbd_obj_request *obj_req = | |
2116 | container_of(ex, struct rbd_obj_request, ex); | |
2117 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2118 | |
afb97888 ID |
2119 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2120 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2121 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2122 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2123 | })); | |
3d7efd18 AE |
2124 | } |
2125 | ||
5a237819 ID |
2126 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2127 | struct ceph_file_extent *img_extents, | |
2128 | u32 num_img_extents, | |
2129 | struct ceph_bio_iter *bio_pos) | |
2130 | { | |
2131 | struct rbd_img_fill_ctx fctx = { | |
2132 | .pos_type = OBJ_REQUEST_BIO, | |
2133 | .pos = (union rbd_img_fill_iter *)bio_pos, | |
2134 | .set_pos_fn = set_bio_pos, | |
afb97888 ID |
2135 | .count_fn = count_bio_bvecs, |
2136 | .copy_fn = copy_bio_bvecs, | |
5a237819 | 2137 | }; |
3d7efd18 | 2138 | |
5a237819 ID |
2139 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2140 | &fctx); | |
2141 | } | |
3d7efd18 | 2142 | |
5a237819 ID |
2143 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2144 | u64 off, u64 len, struct bio *bio) | |
2145 | { | |
2146 | struct ceph_file_extent ex = { off, len }; | |
2147 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; | |
3d7efd18 | 2148 | |
5a237819 ID |
2149 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
2150 | } | |
a9e8ba2c | 2151 | |
5a237819 ID |
2152 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2153 | { | |
2154 | struct rbd_obj_request *obj_req = | |
2155 | container_of(ex, struct rbd_obj_request, ex); | |
2156 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2157 | |
5a237819 ID |
2158 | obj_req->bvec_pos = *it; |
2159 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); | |
2160 | ceph_bvec_iter_advance(it, bytes); | |
2161 | } | |
3d7efd18 | 2162 | |
afb97888 ID |
2163 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2164 | { | |
2165 | struct rbd_obj_request *obj_req = | |
2166 | container_of(ex, struct rbd_obj_request, ex); | |
2167 | struct ceph_bvec_iter *it = arg; | |
058aa991 | 2168 | |
afb97888 ID |
2169 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2170 | obj_req->bvec_count++; | |
2171 | })); | |
2172 | } | |
058aa991 | 2173 | |
afb97888 ID |
2174 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2175 | { | |
2176 | struct rbd_obj_request *obj_req = | |
2177 | container_of(ex, struct rbd_obj_request, ex); | |
2178 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2179 | |
afb97888 ID |
2180 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2181 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2182 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2183 | })); | |
3d7efd18 AE |
2184 | } |
2185 | ||
5a237819 ID |
2186 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2187 | struct ceph_file_extent *img_extents, | |
2188 | u32 num_img_extents, | |
2189 | struct ceph_bvec_iter *bvec_pos) | |
c5b5ef6c | 2190 | { |
5a237819 ID |
2191 | struct rbd_img_fill_ctx fctx = { |
2192 | .pos_type = OBJ_REQUEST_BVECS, | |
2193 | .pos = (union rbd_img_fill_iter *)bvec_pos, | |
2194 | .set_pos_fn = set_bvec_pos, | |
afb97888 ID |
2195 | .count_fn = count_bvecs, |
2196 | .copy_fn = copy_bvecs, | |
5a237819 | 2197 | }; |
c5b5ef6c | 2198 | |
5a237819 ID |
2199 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2200 | &fctx); | |
2201 | } | |
c5b5ef6c | 2202 | |
5a237819 ID |
2203 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2204 | struct ceph_file_extent *img_extents, | |
2205 | u32 num_img_extents, | |
2206 | struct bio_vec *bvecs) | |
2207 | { | |
2208 | struct ceph_bvec_iter it = { | |
2209 | .bvecs = bvecs, | |
2210 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, | |
2211 | num_img_extents) }, | |
2212 | }; | |
c5b5ef6c | 2213 | |
5a237819 ID |
2214 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
2215 | &it); | |
2216 | } | |
c5b5ef6c | 2217 | |
efbd1a11 | 2218 | static void rbd_img_request_submit(struct rbd_img_request *img_request) |
bf0d5f50 | 2219 | { |
bf0d5f50 | 2220 | struct rbd_obj_request *obj_request; |
c5b5ef6c | 2221 | |
37206ee5 | 2222 | dout("%s: img %p\n", __func__, img_request); |
c2e82414 | 2223 | |
663ae2cc | 2224 | rbd_img_request_get(img_request); |
efbd1a11 | 2225 | for_each_obj_request(img_request, obj_request) |
3da691bf | 2226 | rbd_obj_request_submit(obj_request); |
c2e82414 | 2227 | |
663ae2cc | 2228 | rbd_img_request_put(img_request); |
c5b5ef6c AE |
2229 | } |
2230 | ||
86bd7998 | 2231 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
c5b5ef6c | 2232 | { |
3da691bf ID |
2233 | struct rbd_img_request *img_req = obj_req->img_request; |
2234 | struct rbd_img_request *child_img_req; | |
c5b5ef6c AE |
2235 | int ret; |
2236 | ||
e93aca0a ID |
2237 | child_img_req = rbd_img_request_create(img_req->rbd_dev->parent, |
2238 | OBJ_OP_READ, NULL); | |
3da691bf | 2239 | if (!child_img_req) |
710214e3 ID |
2240 | return -ENOMEM; |
2241 | ||
e93aca0a ID |
2242 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
2243 | child_img_req->obj_request = obj_req; | |
a90bb0c1 | 2244 | |
3da691bf | 2245 | if (!rbd_img_is_write(img_req)) { |
ecc633ca | 2246 | switch (img_req->data_type) { |
3da691bf | 2247 | case OBJ_REQUEST_BIO: |
5a237819 ID |
2248 | ret = __rbd_img_fill_from_bio(child_img_req, |
2249 | obj_req->img_extents, | |
2250 | obj_req->num_img_extents, | |
2251 | &obj_req->bio_pos); | |
3da691bf ID |
2252 | break; |
2253 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2254 | case OBJ_REQUEST_OWN_BVECS: |
5a237819 ID |
2255 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
2256 | obj_req->img_extents, | |
2257 | obj_req->num_img_extents, | |
2258 | &obj_req->bvec_pos); | |
3da691bf ID |
2259 | break; |
2260 | default: | |
2261 | rbd_assert(0); | |
2262 | } | |
2263 | } else { | |
5a237819 ID |
2264 | ret = rbd_img_fill_from_bvecs(child_img_req, |
2265 | obj_req->img_extents, | |
2266 | obj_req->num_img_extents, | |
2267 | obj_req->copyup_bvecs); | |
3da691bf ID |
2268 | } |
2269 | if (ret) { | |
2270 | rbd_img_request_put(child_img_req); | |
2271 | return ret; | |
2272 | } | |
2273 | ||
2274 | rbd_img_request_submit(child_img_req); | |
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req) | |
2279 | { | |
2280 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2281 | int ret; | |
2282 | ||
2283 | if (obj_req->result == -ENOENT && | |
86bd7998 ID |
2284 | rbd_dev->parent_overlap && !obj_req->tried_parent) { |
2285 | /* reverse map this object extent onto the parent */ | |
2286 | ret = rbd_obj_calc_img_extents(obj_req, false); | |
3da691bf ID |
2287 | if (ret) { |
2288 | obj_req->result = ret; | |
2289 | return true; | |
2290 | } | |
86bd7998 ID |
2291 | |
2292 | if (obj_req->num_img_extents) { | |
2293 | obj_req->tried_parent = true; | |
2294 | ret = rbd_obj_read_from_parent(obj_req); | |
2295 | if (ret) { | |
2296 | obj_req->result = ret; | |
2297 | return true; | |
2298 | } | |
2299 | return false; | |
2300 | } | |
710214e3 ID |
2301 | } |
2302 | ||
c5b5ef6c | 2303 | /* |
3da691bf ID |
2304 | * -ENOENT means a hole in the image -- zero-fill the entire |
2305 | * length of the request. A short read also implies zero-fill | |
2306 | * to the end of the request. In both cases we update xferred | |
2307 | * count to indicate the whole request was satisfied. | |
c5b5ef6c | 2308 | */ |
3da691bf | 2309 | if (obj_req->result == -ENOENT || |
43df3d35 | 2310 | (!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) { |
3da691bf ID |
2311 | rbd_assert(!obj_req->xferred || !obj_req->result); |
2312 | rbd_obj_zero_range(obj_req, obj_req->xferred, | |
43df3d35 | 2313 | obj_req->ex.oe_len - obj_req->xferred); |
3da691bf | 2314 | obj_req->result = 0; |
43df3d35 | 2315 | obj_req->xferred = obj_req->ex.oe_len; |
710214e3 | 2316 | } |
c5b5ef6c | 2317 | |
3da691bf ID |
2318 | return true; |
2319 | } | |
c5b5ef6c | 2320 | |
3da691bf ID |
2321 | /* |
2322 | * copyup_bvecs pages are never highmem pages | |
2323 | */ | |
2324 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
2325 | { | |
2326 | struct ceph_bvec_iter it = { | |
2327 | .bvecs = bvecs, | |
2328 | .iter = { .bi_size = bytes }, | |
2329 | }; | |
c5b5ef6c | 2330 | |
3da691bf ID |
2331 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
2332 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
2333 | bv.bv_len)) | |
2334 | return false; | |
2335 | })); | |
2336 | return true; | |
c5b5ef6c AE |
2337 | } |
2338 | ||
3da691bf | 2339 | static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes) |
b454e36d | 2340 | { |
3da691bf | 2341 | unsigned int num_osd_ops = obj_req->osd_req->r_num_ops; |
70d045f6 | 2342 | |
3da691bf ID |
2343 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
2344 | rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT); | |
2345 | rbd_osd_req_destroy(obj_req->osd_req); | |
70d045f6 | 2346 | |
b454e36d | 2347 | /* |
3da691bf ID |
2348 | * Create a copyup request with the same number of OSD ops as |
2349 | * the original request. The original request was stat + op(s), | |
2350 | * the new copyup request will be copyup + the same op(s). | |
b454e36d | 2351 | */ |
a162b308 | 2352 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2353 | if (!obj_req->osd_req) |
2354 | return -ENOMEM; | |
b454e36d | 2355 | |
c622d226 | 2356 | /* |
3da691bf ID |
2357 | * Only send non-zero copyup data to save some I/O and network |
2358 | * bandwidth -- zero copyup data is equivalent to the object not | |
2359 | * existing. | |
c622d226 | 2360 | */ |
3da691bf ID |
2361 | if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) { |
2362 | dout("%s obj_req %p detected zeroes\n", __func__, obj_req); | |
2363 | bytes = 0; | |
2364 | } | |
c622d226 | 2365 | |
3da691bf ID |
2366 | osd_req_op_cls_init(obj_req->osd_req, 0, CEPH_OSD_OP_CALL, "rbd", |
2367 | "copyup"); | |
2368 | osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0, | |
2369 | obj_req->copyup_bvecs, bytes); | |
2370 | ||
9bb0248d | 2371 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2372 | case OBJ_OP_WRITE: |
2373 | __rbd_obj_setup_write(obj_req, 1); | |
2374 | break; | |
2375 | case OBJ_OP_DISCARD: | |
2376 | rbd_assert(!rbd_obj_is_entire(obj_req)); | |
2377 | __rbd_obj_setup_discard(obj_req, 1); | |
2378 | break; | |
2379 | default: | |
2380 | rbd_assert(0); | |
2381 | } | |
70d045f6 | 2382 | |
3da691bf | 2383 | rbd_obj_request_submit(obj_req); |
3da691bf | 2384 | return 0; |
70d045f6 ID |
2385 | } |
2386 | ||
7e07efb1 | 2387 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
70d045f6 | 2388 | { |
7e07efb1 | 2389 | u32 i; |
b454e36d | 2390 | |
7e07efb1 ID |
2391 | rbd_assert(!obj_req->copyup_bvecs); |
2392 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
2393 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
2394 | sizeof(*obj_req->copyup_bvecs), | |
2395 | GFP_NOIO); | |
2396 | if (!obj_req->copyup_bvecs) | |
2397 | return -ENOMEM; | |
b454e36d | 2398 | |
7e07efb1 ID |
2399 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
2400 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
2401 | ||
2402 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
2403 | if (!obj_req->copyup_bvecs[i].bv_page) | |
2404 | return -ENOMEM; | |
3d7efd18 | 2405 | |
7e07efb1 ID |
2406 | obj_req->copyup_bvecs[i].bv_offset = 0; |
2407 | obj_req->copyup_bvecs[i].bv_len = len; | |
2408 | obj_overlap -= len; | |
2409 | } | |
b454e36d | 2410 | |
7e07efb1 ID |
2411 | rbd_assert(!obj_overlap); |
2412 | return 0; | |
b454e36d AE |
2413 | } |
2414 | ||
3da691bf | 2415 | static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) |
bf0d5f50 | 2416 | { |
3da691bf | 2417 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
3da691bf | 2418 | int ret; |
bf0d5f50 | 2419 | |
86bd7998 ID |
2420 | rbd_assert(obj_req->num_img_extents); |
2421 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
2422 | rbd_dev->parent_overlap); | |
2423 | if (!obj_req->num_img_extents) { | |
3da691bf ID |
2424 | /* |
2425 | * The overlap has become 0 (most likely because the | |
2426 | * image has been flattened). Use rbd_obj_issue_copyup() | |
2427 | * to re-submit the original write request -- the copyup | |
2428 | * operation itself will be a no-op, since someone must | |
2429 | * have populated the child object while we weren't | |
2430 | * looking. Move to WRITE_FLAT state as we'll be done | |
2431 | * with the operation once the null copyup completes. | |
2432 | */ | |
2433 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2434 | return rbd_obj_issue_copyup(obj_req, 0); | |
bf0d5f50 AE |
2435 | } |
2436 | ||
86bd7998 | 2437 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
3da691bf ID |
2438 | if (ret) |
2439 | return ret; | |
2440 | ||
2441 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; | |
86bd7998 | 2442 | return rbd_obj_read_from_parent(obj_req); |
bf0d5f50 | 2443 | } |
8b3e1a56 | 2444 | |
3da691bf | 2445 | static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req) |
8b3e1a56 | 2446 | { |
3da691bf | 2447 | int ret; |
8b3e1a56 | 2448 | |
3da691bf ID |
2449 | again: |
2450 | switch (obj_req->write_state) { | |
2451 | case RBD_OBJ_WRITE_GUARD: | |
2452 | rbd_assert(!obj_req->xferred); | |
2453 | if (obj_req->result == -ENOENT) { | |
2454 | /* | |
2455 | * The target object doesn't exist. Read the data for | |
2456 | * the entire target object up to the overlap point (if | |
2457 | * any) from the parent, so we can use it for a copyup. | |
2458 | */ | |
2459 | ret = rbd_obj_handle_write_guard(obj_req); | |
2460 | if (ret) { | |
2461 | obj_req->result = ret; | |
2462 | return true; | |
2463 | } | |
2464 | return false; | |
2465 | } | |
2466 | /* fall through */ | |
2467 | case RBD_OBJ_WRITE_FLAT: | |
2468 | if (!obj_req->result) | |
2469 | /* | |
2470 | * There is no such thing as a successful short | |
2471 | * write -- indicate the whole request was satisfied. | |
2472 | */ | |
43df3d35 | 2473 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2474 | return true; |
2475 | case RBD_OBJ_WRITE_COPYUP: | |
2476 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2477 | if (obj_req->result) | |
2478 | goto again; | |
8b3e1a56 | 2479 | |
3da691bf ID |
2480 | rbd_assert(obj_req->xferred); |
2481 | ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred); | |
2482 | if (ret) { | |
2483 | obj_req->result = ret; | |
2484 | return true; | |
2485 | } | |
2486 | return false; | |
2487 | default: | |
c6244b3b | 2488 | BUG(); |
3da691bf ID |
2489 | } |
2490 | } | |
02c74fba | 2491 | |
3da691bf ID |
2492 | /* |
2493 | * Returns true if @obj_req is completed, or false otherwise. | |
2494 | */ | |
2495 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2496 | { | |
9bb0248d | 2497 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2498 | case OBJ_OP_READ: |
2499 | return rbd_obj_handle_read(obj_req); | |
2500 | case OBJ_OP_WRITE: | |
2501 | return rbd_obj_handle_write(obj_req); | |
2502 | case OBJ_OP_DISCARD: | |
2503 | if (rbd_obj_handle_write(obj_req)) { | |
2504 | /* | |
2505 | * Hide -ENOENT from delete/truncate/zero -- discarding | |
2506 | * a non-existent object is not a problem. | |
2507 | */ | |
2508 | if (obj_req->result == -ENOENT) { | |
2509 | obj_req->result = 0; | |
43df3d35 | 2510 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2511 | } |
2512 | return true; | |
2513 | } | |
2514 | return false; | |
2515 | default: | |
c6244b3b | 2516 | BUG(); |
3da691bf ID |
2517 | } |
2518 | } | |
02c74fba | 2519 | |
7114edac ID |
2520 | static void rbd_obj_end_request(struct rbd_obj_request *obj_req) |
2521 | { | |
2522 | struct rbd_img_request *img_req = obj_req->img_request; | |
2523 | ||
2524 | rbd_assert((!obj_req->result && | |
43df3d35 | 2525 | obj_req->xferred == obj_req->ex.oe_len) || |
7114edac ID |
2526 | (obj_req->result < 0 && !obj_req->xferred)); |
2527 | if (!obj_req->result) { | |
2528 | img_req->xferred += obj_req->xferred; | |
980917fc | 2529 | return; |
02c74fba | 2530 | } |
a9e8ba2c | 2531 | |
7114edac ID |
2532 | rbd_warn(img_req->rbd_dev, |
2533 | "%s at objno %llu %llu~%llu result %d xferred %llu", | |
43df3d35 ID |
2534 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
2535 | obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result, | |
7114edac ID |
2536 | obj_req->xferred); |
2537 | if (!img_req->result) { | |
2538 | img_req->result = obj_req->result; | |
2539 | img_req->xferred = 0; | |
2540 | } | |
2541 | } | |
a9e8ba2c | 2542 | |
3da691bf ID |
2543 | static void rbd_img_end_child_request(struct rbd_img_request *img_req) |
2544 | { | |
2545 | struct rbd_obj_request *obj_req = img_req->obj_request; | |
a9e8ba2c | 2546 | |
3da691bf | 2547 | rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags)); |
86bd7998 ID |
2548 | rbd_assert((!img_req->result && |
2549 | img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) || | |
2550 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2551 | |
3da691bf ID |
2552 | obj_req->result = img_req->result; |
2553 | obj_req->xferred = img_req->xferred; | |
2554 | rbd_img_request_put(img_req); | |
8b3e1a56 AE |
2555 | } |
2556 | ||
7114edac | 2557 | static void rbd_img_end_request(struct rbd_img_request *img_req) |
8b3e1a56 | 2558 | { |
7114edac ID |
2559 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); |
2560 | rbd_assert((!img_req->result && | |
2561 | img_req->xferred == blk_rq_bytes(img_req->rq)) || | |
2562 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2563 | |
7114edac ID |
2564 | blk_mq_end_request(img_req->rq, |
2565 | errno_to_blk_status(img_req->result)); | |
2566 | rbd_img_request_put(img_req); | |
3da691bf | 2567 | } |
8b3e1a56 | 2568 | |
3da691bf ID |
2569 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req) |
2570 | { | |
7114edac | 2571 | struct rbd_img_request *img_req; |
8b3e1a56 | 2572 | |
7114edac | 2573 | again: |
3da691bf ID |
2574 | if (!__rbd_obj_handle_request(obj_req)) |
2575 | return; | |
8b3e1a56 | 2576 | |
7114edac ID |
2577 | img_req = obj_req->img_request; |
2578 | spin_lock(&img_req->completion_lock); | |
2579 | rbd_obj_end_request(obj_req); | |
2580 | rbd_assert(img_req->pending_count); | |
2581 | if (--img_req->pending_count) { | |
2582 | spin_unlock(&img_req->completion_lock); | |
2583 | return; | |
2584 | } | |
8b3e1a56 | 2585 | |
7114edac ID |
2586 | spin_unlock(&img_req->completion_lock); |
2587 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { | |
2588 | obj_req = img_req->obj_request; | |
2589 | rbd_img_end_child_request(img_req); | |
2590 | goto again; | |
2591 | } | |
2592 | rbd_img_end_request(img_req); | |
8b3e1a56 | 2593 | } |
bf0d5f50 | 2594 | |
ed95b21a | 2595 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 2596 | |
ed95b21a ID |
2597 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
2598 | const struct rbd_client_id *rhs) | |
2599 | { | |
2600 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
2601 | } | |
2602 | ||
2603 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
2604 | { | |
2605 | struct rbd_client_id cid; | |
2606 | ||
2607 | mutex_lock(&rbd_dev->watch_mutex); | |
2608 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
2609 | cid.handle = rbd_dev->watch_cookie; | |
2610 | mutex_unlock(&rbd_dev->watch_mutex); | |
2611 | return cid; | |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * lock_rwsem must be held for write | |
2616 | */ | |
2617 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
2618 | const struct rbd_client_id *cid) | |
2619 | { | |
2620 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
2621 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
2622 | cid->gid, cid->handle); | |
2623 | rbd_dev->owner_cid = *cid; /* struct */ | |
2624 | } | |
2625 | ||
2626 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
2627 | { | |
2628 | mutex_lock(&rbd_dev->watch_mutex); | |
2629 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
2630 | mutex_unlock(&rbd_dev->watch_mutex); | |
2631 | } | |
2632 | ||
edd8ca80 FM |
2633 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
2634 | { | |
2635 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
2636 | ||
2637 | strcpy(rbd_dev->lock_cookie, cookie); | |
2638 | rbd_set_owner_cid(rbd_dev, &cid); | |
2639 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
2640 | } | |
2641 | ||
ed95b21a ID |
2642 | /* |
2643 | * lock_rwsem must be held for write | |
2644 | */ | |
2645 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 2646 | { |
922dab61 | 2647 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 2648 | char cookie[32]; |
e627db08 | 2649 | int ret; |
b8d70035 | 2650 | |
cbbfb0ff ID |
2651 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
2652 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 2653 | |
ed95b21a ID |
2654 | format_lock_cookie(rbd_dev, cookie); |
2655 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
2656 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
2657 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 2658 | if (ret) |
ed95b21a | 2659 | return ret; |
b8d70035 | 2660 | |
ed95b21a | 2661 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 2662 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 2663 | return 0; |
b8d70035 AE |
2664 | } |
2665 | ||
ed95b21a ID |
2666 | /* |
2667 | * lock_rwsem must be held for write | |
2668 | */ | |
bbead745 | 2669 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 2670 | { |
922dab61 | 2671 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
2672 | int ret; |
2673 | ||
cbbfb0ff ID |
2674 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
2675 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 2676 | |
ed95b21a | 2677 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 2678 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
2679 | if (ret && ret != -ENOENT) |
2680 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 2681 | |
bbead745 ID |
2682 | /* treat errors as the image is unlocked */ |
2683 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 2684 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
2685 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
2686 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
2687 | } |
2688 | ||
ed95b21a ID |
2689 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2690 | enum rbd_notify_op notify_op, | |
2691 | struct page ***preply_pages, | |
2692 | size_t *preply_len) | |
9969ebc5 AE |
2693 | { |
2694 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a | 2695 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
08a79102 KS |
2696 | char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
2697 | int buf_size = sizeof(buf); | |
ed95b21a | 2698 | void *p = buf; |
9969ebc5 | 2699 | |
ed95b21a | 2700 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 2701 | |
ed95b21a ID |
2702 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
2703 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
2704 | ceph_encode_32(&p, notify_op); | |
2705 | ceph_encode_64(&p, cid.gid); | |
2706 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 2707 | |
ed95b21a ID |
2708 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
2709 | &rbd_dev->header_oloc, buf, buf_size, | |
2710 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
2711 | } |
2712 | ||
ed95b21a ID |
2713 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2714 | enum rbd_notify_op notify_op) | |
b30a01f2 | 2715 | { |
ed95b21a ID |
2716 | struct page **reply_pages; |
2717 | size_t reply_len; | |
b30a01f2 | 2718 | |
ed95b21a ID |
2719 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
2720 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2721 | } | |
b30a01f2 | 2722 | |
ed95b21a ID |
2723 | static void rbd_notify_acquired_lock(struct work_struct *work) |
2724 | { | |
2725 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
2726 | acquired_lock_work); | |
76756a51 | 2727 | |
ed95b21a | 2728 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
2729 | } |
2730 | ||
ed95b21a | 2731 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 2732 | { |
ed95b21a ID |
2733 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
2734 | released_lock_work); | |
811c6688 | 2735 | |
ed95b21a | 2736 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
2737 | } |
2738 | ||
ed95b21a | 2739 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 2740 | { |
ed95b21a ID |
2741 | struct page **reply_pages; |
2742 | size_t reply_len; | |
2743 | bool lock_owner_responded = false; | |
36be9a76 AE |
2744 | int ret; |
2745 | ||
ed95b21a | 2746 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 2747 | |
ed95b21a ID |
2748 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
2749 | &reply_pages, &reply_len); | |
2750 | if (ret && ret != -ETIMEDOUT) { | |
2751 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 2752 | goto out; |
ed95b21a | 2753 | } |
36be9a76 | 2754 | |
ed95b21a ID |
2755 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
2756 | void *p = page_address(reply_pages[0]); | |
2757 | void *const end = p + reply_len; | |
2758 | u32 n; | |
36be9a76 | 2759 | |
ed95b21a ID |
2760 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
2761 | while (n--) { | |
2762 | u8 struct_v; | |
2763 | u32 len; | |
36be9a76 | 2764 | |
ed95b21a ID |
2765 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
2766 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 2767 | |
ed95b21a ID |
2768 | ceph_decode_32_safe(&p, end, len, e_inval); |
2769 | if (!len) | |
2770 | continue; | |
2771 | ||
2772 | if (lock_owner_responded) { | |
2773 | rbd_warn(rbd_dev, | |
2774 | "duplicate lock owners detected"); | |
2775 | ret = -EIO; | |
2776 | goto out; | |
2777 | } | |
2778 | ||
2779 | lock_owner_responded = true; | |
2780 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
2781 | &struct_v, &len); | |
2782 | if (ret) { | |
2783 | rbd_warn(rbd_dev, | |
2784 | "failed to decode ResponseMessage: %d", | |
2785 | ret); | |
2786 | goto e_inval; | |
2787 | } | |
2788 | ||
2789 | ret = ceph_decode_32(&p); | |
2790 | } | |
2791 | } | |
2792 | ||
2793 | if (!lock_owner_responded) { | |
2794 | rbd_warn(rbd_dev, "no lock owners detected"); | |
2795 | ret = -ETIMEDOUT; | |
2796 | } | |
2797 | ||
2798 | out: | |
2799 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2800 | return ret; | |
2801 | ||
2802 | e_inval: | |
2803 | ret = -EINVAL; | |
2804 | goto out; | |
2805 | } | |
2806 | ||
2807 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
2808 | { | |
2809 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
2810 | ||
2811 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
2812 | if (wake_all) | |
2813 | wake_up_all(&rbd_dev->lock_waitq); | |
2814 | else | |
2815 | wake_up(&rbd_dev->lock_waitq); | |
2816 | } | |
2817 | ||
2818 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
2819 | struct ceph_locker **lockers, u32 *num_lockers) | |
2820 | { | |
2821 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2822 | u8 lock_type; | |
2823 | char *lock_tag; | |
2824 | int ret; | |
2825 | ||
2826 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2827 | ||
2828 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
2829 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2830 | &lock_type, &lock_tag, lockers, num_lockers); | |
2831 | if (ret) | |
2832 | return ret; | |
2833 | ||
2834 | if (*num_lockers == 0) { | |
2835 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
2836 | goto out; | |
2837 | } | |
2838 | ||
2839 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
2840 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
2841 | lock_tag); | |
2842 | ret = -EBUSY; | |
2843 | goto out; | |
2844 | } | |
2845 | ||
2846 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
2847 | rbd_warn(rbd_dev, "shared lock type detected"); | |
2848 | ret = -EBUSY; | |
2849 | goto out; | |
2850 | } | |
2851 | ||
2852 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
2853 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
2854 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
2855 | (*lockers)[0].id.cookie); | |
2856 | ret = -EBUSY; | |
2857 | goto out; | |
2858 | } | |
2859 | ||
2860 | out: | |
2861 | kfree(lock_tag); | |
2862 | return ret; | |
2863 | } | |
2864 | ||
2865 | static int find_watcher(struct rbd_device *rbd_dev, | |
2866 | const struct ceph_locker *locker) | |
2867 | { | |
2868 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2869 | struct ceph_watch_item *watchers; | |
2870 | u32 num_watchers; | |
2871 | u64 cookie; | |
2872 | int i; | |
2873 | int ret; | |
2874 | ||
2875 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
2876 | &rbd_dev->header_oloc, &watchers, | |
2877 | &num_watchers); | |
2878 | if (ret) | |
2879 | return ret; | |
2880 | ||
2881 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
2882 | for (i = 0; i < num_watchers; i++) { | |
2883 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
2884 | sizeof(locker->info.addr)) && | |
2885 | watchers[i].cookie == cookie) { | |
2886 | struct rbd_client_id cid = { | |
2887 | .gid = le64_to_cpu(watchers[i].name.num), | |
2888 | .handle = cookie, | |
2889 | }; | |
2890 | ||
2891 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
2892 | rbd_dev, cid.gid, cid.handle); | |
2893 | rbd_set_owner_cid(rbd_dev, &cid); | |
2894 | ret = 1; | |
2895 | goto out; | |
2896 | } | |
2897 | } | |
2898 | ||
2899 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
2900 | ret = 0; | |
2901 | out: | |
2902 | kfree(watchers); | |
2903 | return ret; | |
2904 | } | |
2905 | ||
2906 | /* | |
2907 | * lock_rwsem must be held for write | |
2908 | */ | |
2909 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
2910 | { | |
2911 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2912 | struct ceph_locker *lockers; | |
2913 | u32 num_lockers; | |
2914 | int ret; | |
2915 | ||
2916 | for (;;) { | |
2917 | ret = rbd_lock(rbd_dev); | |
2918 | if (ret != -EBUSY) | |
2919 | return ret; | |
2920 | ||
2921 | /* determine if the current lock holder is still alive */ | |
2922 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
2923 | if (ret) | |
2924 | return ret; | |
2925 | ||
2926 | if (num_lockers == 0) | |
2927 | goto again; | |
2928 | ||
2929 | ret = find_watcher(rbd_dev, lockers); | |
2930 | if (ret) { | |
2931 | if (ret > 0) | |
2932 | ret = 0; /* have to request lock */ | |
2933 | goto out; | |
2934 | } | |
2935 | ||
2936 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
2937 | ENTITY_NAME(lockers[0].id.name)); | |
2938 | ||
2939 | ret = ceph_monc_blacklist_add(&client->monc, | |
2940 | &lockers[0].info.addr); | |
2941 | if (ret) { | |
2942 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
2943 | ENTITY_NAME(lockers[0].id.name), ret); | |
2944 | goto out; | |
2945 | } | |
2946 | ||
2947 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
2948 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2949 | lockers[0].id.cookie, | |
2950 | &lockers[0].id.name); | |
2951 | if (ret && ret != -ENOENT) | |
2952 | goto out; | |
2953 | ||
2954 | again: | |
2955 | ceph_free_lockers(lockers, num_lockers); | |
2956 | } | |
2957 | ||
2958 | out: | |
2959 | ceph_free_lockers(lockers, num_lockers); | |
2960 | return ret; | |
2961 | } | |
2962 | ||
2963 | /* | |
2964 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
2965 | */ | |
2966 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
2967 | int *pret) | |
2968 | { | |
2969 | enum rbd_lock_state lock_state; | |
2970 | ||
2971 | down_read(&rbd_dev->lock_rwsem); | |
2972 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
2973 | rbd_dev->lock_state); | |
2974 | if (__rbd_is_lock_owner(rbd_dev)) { | |
2975 | lock_state = rbd_dev->lock_state; | |
2976 | up_read(&rbd_dev->lock_rwsem); | |
2977 | return lock_state; | |
2978 | } | |
2979 | ||
2980 | up_read(&rbd_dev->lock_rwsem); | |
2981 | down_write(&rbd_dev->lock_rwsem); | |
2982 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
2983 | rbd_dev->lock_state); | |
2984 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
2985 | *pret = rbd_try_lock(rbd_dev); | |
2986 | if (*pret) | |
2987 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
2988 | } | |
2989 | ||
2990 | lock_state = rbd_dev->lock_state; | |
2991 | up_write(&rbd_dev->lock_rwsem); | |
2992 | return lock_state; | |
2993 | } | |
2994 | ||
2995 | static void rbd_acquire_lock(struct work_struct *work) | |
2996 | { | |
2997 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
2998 | struct rbd_device, lock_dwork); | |
2999 | enum rbd_lock_state lock_state; | |
37f13252 | 3000 | int ret = 0; |
ed95b21a ID |
3001 | |
3002 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3003 | again: | |
3004 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
3005 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
3006 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
3007 | wake_requests(rbd_dev, true); | |
3008 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
3009 | rbd_dev, lock_state, ret); | |
3010 | return; | |
3011 | } | |
3012 | ||
3013 | ret = rbd_request_lock(rbd_dev); | |
3014 | if (ret == -ETIMEDOUT) { | |
3015 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
3016 | } else if (ret == -EROFS) { |
3017 | rbd_warn(rbd_dev, "peer will not release lock"); | |
3018 | /* | |
3019 | * If this is rbd_add_acquire_lock(), we want to fail | |
3020 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
3021 | * want to block. | |
3022 | */ | |
3023 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
3024 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
3025 | /* wake "rbd map --exclusive" process */ | |
3026 | wake_requests(rbd_dev, false); | |
3027 | } | |
ed95b21a ID |
3028 | } else if (ret < 0) { |
3029 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3030 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3031 | RBD_RETRY_DELAY); | |
3032 | } else { | |
3033 | /* | |
3034 | * lock owner acked, but resend if we don't see them | |
3035 | * release the lock | |
3036 | */ | |
3037 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3038 | rbd_dev); | |
3039 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3040 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3041 | } | |
3042 | } | |
3043 | ||
3044 | /* | |
3045 | * lock_rwsem must be held for write | |
3046 | */ | |
3047 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3048 | { | |
3049 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3050 | rbd_dev->lock_state); | |
3051 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3052 | return false; | |
3053 | ||
3054 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3055 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3056 | /* |
ed95b21a | 3057 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3058 | * |
ed95b21a ID |
3059 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3060 | * may be shared with other devices. | |
52bb1f9b | 3061 | */ |
ed95b21a ID |
3062 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3063 | up_read(&rbd_dev->lock_rwsem); | |
3064 | ||
3065 | down_write(&rbd_dev->lock_rwsem); | |
3066 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3067 | rbd_dev->lock_state); | |
3068 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3069 | return false; | |
3070 | ||
bbead745 ID |
3071 | rbd_unlock(rbd_dev); |
3072 | /* | |
3073 | * Give others a chance to grab the lock - we would re-acquire | |
3074 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3075 | * otherwise. We need to ack our own notifications, so this | |
3076 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3077 | * after wake_requests() in rbd_handle_released_lock(). | |
3078 | */ | |
3079 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3080 | return true; |
3081 | } | |
3082 | ||
3083 | static void rbd_release_lock_work(struct work_struct *work) | |
3084 | { | |
3085 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3086 | unlock_work); | |
3087 | ||
3088 | down_write(&rbd_dev->lock_rwsem); | |
3089 | rbd_release_lock(rbd_dev); | |
3090 | up_write(&rbd_dev->lock_rwsem); | |
3091 | } | |
3092 | ||
3093 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3094 | void **p) | |
3095 | { | |
3096 | struct rbd_client_id cid = { 0 }; | |
3097 | ||
3098 | if (struct_v >= 2) { | |
3099 | cid.gid = ceph_decode_64(p); | |
3100 | cid.handle = ceph_decode_64(p); | |
3101 | } | |
3102 | ||
3103 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3104 | cid.handle); | |
3105 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3106 | down_write(&rbd_dev->lock_rwsem); | |
3107 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3108 | /* | |
3109 | * we already know that the remote client is | |
3110 | * the owner | |
3111 | */ | |
3112 | up_write(&rbd_dev->lock_rwsem); | |
3113 | return; | |
3114 | } | |
3115 | ||
3116 | rbd_set_owner_cid(rbd_dev, &cid); | |
3117 | downgrade_write(&rbd_dev->lock_rwsem); | |
3118 | } else { | |
3119 | down_read(&rbd_dev->lock_rwsem); | |
3120 | } | |
3121 | ||
3122 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3123 | wake_requests(rbd_dev, false); | |
3124 | up_read(&rbd_dev->lock_rwsem); | |
3125 | } | |
3126 | ||
3127 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3128 | void **p) | |
3129 | { | |
3130 | struct rbd_client_id cid = { 0 }; | |
3131 | ||
3132 | if (struct_v >= 2) { | |
3133 | cid.gid = ceph_decode_64(p); | |
3134 | cid.handle = ceph_decode_64(p); | |
3135 | } | |
3136 | ||
3137 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3138 | cid.handle); | |
3139 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3140 | down_write(&rbd_dev->lock_rwsem); | |
3141 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3142 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3143 | __func__, rbd_dev, cid.gid, cid.handle, | |
3144 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3145 | up_write(&rbd_dev->lock_rwsem); | |
3146 | return; | |
3147 | } | |
3148 | ||
3149 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3150 | downgrade_write(&rbd_dev->lock_rwsem); | |
3151 | } else { | |
3152 | down_read(&rbd_dev->lock_rwsem); | |
3153 | } | |
3154 | ||
3155 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3156 | wake_requests(rbd_dev, false); | |
3157 | up_read(&rbd_dev->lock_rwsem); | |
3158 | } | |
3159 | ||
3b77faa0 ID |
3160 | /* |
3161 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3162 | * ResponseMessage is needed. | |
3163 | */ | |
3164 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3165 | void **p) | |
ed95b21a ID |
3166 | { |
3167 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3168 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3169 | int result = 1; |
ed95b21a ID |
3170 | |
3171 | if (struct_v >= 2) { | |
3172 | cid.gid = ceph_decode_64(p); | |
3173 | cid.handle = ceph_decode_64(p); | |
3174 | } | |
3175 | ||
3176 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3177 | cid.handle); | |
3178 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3179 | return result; |
ed95b21a ID |
3180 | |
3181 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3182 | if (__rbd_is_lock_owner(rbd_dev)) { |
3183 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3184 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3185 | goto out_unlock; | |
3186 | ||
3187 | /* | |
3188 | * encode ResponseMessage(0) so the peer can detect | |
3189 | * a missing owner | |
3190 | */ | |
3191 | result = 0; | |
3192 | ||
3193 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3194 | if (!rbd_dev->opts->exclusive) { |
3195 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3196 | __func__, rbd_dev); | |
3197 | queue_work(rbd_dev->task_wq, | |
3198 | &rbd_dev->unlock_work); | |
3199 | } else { | |
3200 | /* refuse to release the lock */ | |
3201 | result = -EROFS; | |
3202 | } | |
ed95b21a ID |
3203 | } |
3204 | } | |
3b77faa0 ID |
3205 | |
3206 | out_unlock: | |
ed95b21a | 3207 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3208 | return result; |
ed95b21a ID |
3209 | } |
3210 | ||
3211 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3212 | u64 notify_id, u64 cookie, s32 *result) | |
3213 | { | |
3214 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
08a79102 KS |
3215 | char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
3216 | int buf_size = sizeof(buf); | |
ed95b21a ID |
3217 | int ret; |
3218 | ||
3219 | if (result) { | |
3220 | void *p = buf; | |
3221 | ||
3222 | /* encode ResponseMessage */ | |
3223 | ceph_start_encoding(&p, 1, 1, | |
3224 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3225 | ceph_encode_32(&p, *result); | |
3226 | } else { | |
3227 | buf_size = 0; | |
3228 | } | |
b8d70035 | 3229 | |
922dab61 ID |
3230 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3231 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3232 | buf, buf_size); |
52bb1f9b | 3233 | if (ret) |
ed95b21a ID |
3234 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3235 | } | |
3236 | ||
3237 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3238 | u64 cookie) | |
3239 | { | |
3240 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3241 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3242 | } | |
3243 | ||
3244 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3245 | u64 notify_id, u64 cookie, s32 result) | |
3246 | { | |
3247 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3248 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3249 | } | |
3250 | ||
3251 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3252 | u64 notifier_id, void *data, size_t data_len) | |
3253 | { | |
3254 | struct rbd_device *rbd_dev = arg; | |
3255 | void *p = data; | |
3256 | void *const end = p + data_len; | |
d4c2269b | 3257 | u8 struct_v = 0; |
ed95b21a ID |
3258 | u32 len; |
3259 | u32 notify_op; | |
3260 | int ret; | |
3261 | ||
3262 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3263 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3264 | if (data_len) { | |
3265 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3266 | &struct_v, &len); | |
3267 | if (ret) { | |
3268 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3269 | ret); | |
3270 | return; | |
3271 | } | |
3272 | ||
3273 | notify_op = ceph_decode_32(&p); | |
3274 | } else { | |
3275 | /* legacy notification for header updates */ | |
3276 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3277 | len = 0; | |
3278 | } | |
3279 | ||
3280 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3281 | switch (notify_op) { | |
3282 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3283 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3284 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3285 | break; | |
3286 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3287 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3288 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3289 | break; | |
3290 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3291 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3292 | if (ret <= 0) | |
ed95b21a | 3293 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3294 | cookie, ret); |
ed95b21a ID |
3295 | else |
3296 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3297 | break; | |
3298 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3299 | ret = rbd_dev_refresh(rbd_dev); | |
3300 | if (ret) | |
3301 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3302 | ||
3303 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3304 | break; | |
3305 | default: | |
3306 | if (rbd_is_lock_owner(rbd_dev)) | |
3307 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3308 | cookie, -EOPNOTSUPP); | |
3309 | else | |
3310 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3311 | break; | |
3312 | } | |
b8d70035 AE |
3313 | } |
3314 | ||
99d16943 ID |
3315 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3316 | ||
922dab61 | 3317 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3318 | { |
922dab61 | 3319 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3320 | |
922dab61 | 3321 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3322 | |
ed95b21a ID |
3323 | down_write(&rbd_dev->lock_rwsem); |
3324 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3325 | up_write(&rbd_dev->lock_rwsem); | |
3326 | ||
99d16943 ID |
3327 | mutex_lock(&rbd_dev->watch_mutex); |
3328 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3329 | __rbd_unregister_watch(rbd_dev); | |
3330 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3331 | |
99d16943 | 3332 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3333 | } |
99d16943 | 3334 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3335 | } |
3336 | ||
9969ebc5 | 3337 | /* |
99d16943 | 3338 | * watch_mutex must be locked |
9969ebc5 | 3339 | */ |
99d16943 | 3340 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3341 | { |
3342 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3343 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3344 | |
922dab61 | 3345 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3346 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3347 | |
922dab61 ID |
3348 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3349 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3350 | rbd_watch_errcb, rbd_dev); | |
3351 | if (IS_ERR(handle)) | |
3352 | return PTR_ERR(handle); | |
8eb87565 | 3353 | |
922dab61 | 3354 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3355 | return 0; |
b30a01f2 ID |
3356 | } |
3357 | ||
99d16943 ID |
3358 | /* |
3359 | * watch_mutex must be locked | |
3360 | */ | |
3361 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3362 | { |
922dab61 ID |
3363 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3364 | int ret; | |
b30a01f2 | 3365 | |
99d16943 ID |
3366 | rbd_assert(rbd_dev->watch_handle); |
3367 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3368 | |
922dab61 ID |
3369 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3370 | if (ret) | |
3371 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3372 | |
922dab61 | 3373 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3374 | } |
3375 | ||
99d16943 ID |
3376 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3377 | { | |
3378 | int ret; | |
3379 | ||
3380 | mutex_lock(&rbd_dev->watch_mutex); | |
3381 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3382 | ret = __rbd_register_watch(rbd_dev); | |
3383 | if (ret) | |
3384 | goto out; | |
3385 | ||
3386 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3387 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3388 | ||
3389 | out: | |
3390 | mutex_unlock(&rbd_dev->watch_mutex); | |
3391 | return ret; | |
3392 | } | |
3393 | ||
3394 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3395 | { |
99d16943 ID |
3396 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3397 | ||
3398 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
ed95b21a ID |
3399 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3400 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3401 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3402 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3403 | } |
3404 | ||
3405 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3406 | { | |
ed95b21a | 3407 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3408 | cancel_tasks_sync(rbd_dev); |
3409 | ||
3410 | mutex_lock(&rbd_dev->watch_mutex); | |
3411 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3412 | __rbd_unregister_watch(rbd_dev); | |
3413 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3414 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3415 | |
811c6688 | 3416 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3417 | } |
3418 | ||
14bb211d ID |
3419 | /* |
3420 | * lock_rwsem must be held for write | |
3421 | */ | |
3422 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3423 | { | |
3424 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3425 | char cookie[32]; | |
3426 | int ret; | |
3427 | ||
3428 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3429 | ||
3430 | format_lock_cookie(rbd_dev, cookie); | |
3431 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3432 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3433 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3434 | RBD_LOCK_TAG, cookie); | |
3435 | if (ret) { | |
3436 | if (ret != -EOPNOTSUPP) | |
3437 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3438 | ret); | |
3439 | ||
3440 | /* | |
3441 | * Lock cookie cannot be updated on older OSDs, so do | |
3442 | * a manual release and queue an acquire. | |
3443 | */ | |
3444 | if (rbd_release_lock(rbd_dev)) | |
3445 | queue_delayed_work(rbd_dev->task_wq, | |
3446 | &rbd_dev->lock_dwork, 0); | |
3447 | } else { | |
edd8ca80 | 3448 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3449 | } |
3450 | } | |
3451 | ||
99d16943 ID |
3452 | static void rbd_reregister_watch(struct work_struct *work) |
3453 | { | |
3454 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3455 | struct rbd_device, watch_dwork); | |
3456 | int ret; | |
3457 | ||
3458 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3459 | ||
3460 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3461 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3462 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3463 | return; |
87c0fded | 3464 | } |
99d16943 ID |
3465 | |
3466 | ret = __rbd_register_watch(rbd_dev); | |
3467 | if (ret) { | |
3468 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3469 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3470 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3471 | wake_requests(rbd_dev, true); |
87c0fded | 3472 | } else { |
99d16943 ID |
3473 | queue_delayed_work(rbd_dev->task_wq, |
3474 | &rbd_dev->watch_dwork, | |
3475 | RBD_RETRY_DELAY); | |
87c0fded ID |
3476 | } |
3477 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3478 | return; |
99d16943 ID |
3479 | } |
3480 | ||
3481 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3482 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3483 | mutex_unlock(&rbd_dev->watch_mutex); | |
3484 | ||
14bb211d ID |
3485 | down_write(&rbd_dev->lock_rwsem); |
3486 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3487 | rbd_reacquire_lock(rbd_dev); | |
3488 | up_write(&rbd_dev->lock_rwsem); | |
3489 | ||
99d16943 ID |
3490 | ret = rbd_dev_refresh(rbd_dev); |
3491 | if (ret) | |
f6870cc9 | 3492 | rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
99d16943 ID |
3493 | } |
3494 | ||
36be9a76 | 3495 | /* |
f40eb349 AE |
3496 | * Synchronous osd object method call. Returns the number of bytes |
3497 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3498 | */ |
3499 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3500 | struct ceph_object_id *oid, |
3501 | struct ceph_object_locator *oloc, | |
36be9a76 | 3502 | const char *method_name, |
4157976b | 3503 | const void *outbound, |
36be9a76 | 3504 | size_t outbound_size, |
4157976b | 3505 | void *inbound, |
e2a58ee5 | 3506 | size_t inbound_size) |
36be9a76 | 3507 | { |
ecd4a68a ID |
3508 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3509 | struct page *req_page = NULL; | |
3510 | struct page *reply_page; | |
36be9a76 AE |
3511 | int ret; |
3512 | ||
3513 | /* | |
6010a451 AE |
3514 | * Method calls are ultimately read operations. The result |
3515 | * should placed into the inbound buffer provided. They | |
3516 | * also supply outbound data--parameters for the object | |
3517 | * method. Currently if this is present it will be a | |
3518 | * snapshot id. | |
36be9a76 | 3519 | */ |
ecd4a68a ID |
3520 | if (outbound) { |
3521 | if (outbound_size > PAGE_SIZE) | |
3522 | return -E2BIG; | |
36be9a76 | 3523 | |
ecd4a68a ID |
3524 | req_page = alloc_page(GFP_KERNEL); |
3525 | if (!req_page) | |
3526 | return -ENOMEM; | |
04017e29 | 3527 | |
ecd4a68a | 3528 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3529 | } |
36be9a76 | 3530 | |
ecd4a68a ID |
3531 | reply_page = alloc_page(GFP_KERNEL); |
3532 | if (!reply_page) { | |
3533 | if (req_page) | |
3534 | __free_page(req_page); | |
3535 | return -ENOMEM; | |
3536 | } | |
57385b51 | 3537 | |
ecd4a68a ID |
3538 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3539 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3540 | reply_page, &inbound_size); | |
3541 | if (!ret) { | |
3542 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3543 | ret = inbound_size; | |
3544 | } | |
36be9a76 | 3545 | |
ecd4a68a ID |
3546 | if (req_page) |
3547 | __free_page(req_page); | |
3548 | __free_page(reply_page); | |
36be9a76 AE |
3549 | return ret; |
3550 | } | |
3551 | ||
ed95b21a ID |
3552 | /* |
3553 | * lock_rwsem must be held for read | |
3554 | */ | |
2f18d466 | 3555 | static int rbd_wait_state_locked(struct rbd_device *rbd_dev, bool may_acquire) |
ed95b21a ID |
3556 | { |
3557 | DEFINE_WAIT(wait); | |
34f55d0b | 3558 | unsigned long timeout; |
2f18d466 ID |
3559 | int ret = 0; |
3560 | ||
3561 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) | |
3562 | return -EBLACKLISTED; | |
3563 | ||
3564 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3565 | return 0; | |
3566 | ||
3567 | if (!may_acquire) { | |
3568 | rbd_warn(rbd_dev, "exclusive lock required"); | |
3569 | return -EROFS; | |
3570 | } | |
ed95b21a ID |
3571 | |
3572 | do { | |
3573 | /* | |
3574 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3575 | * and cancel_delayed_work() in wake_requests(). | |
3576 | */ | |
3577 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3578 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3579 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3580 | TASK_UNINTERRUPTIBLE); | |
3581 | up_read(&rbd_dev->lock_rwsem); | |
34f55d0b DY |
3582 | timeout = schedule_timeout(ceph_timeout_jiffies( |
3583 | rbd_dev->opts->lock_timeout)); | |
ed95b21a | 3584 | down_read(&rbd_dev->lock_rwsem); |
2f18d466 ID |
3585 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3586 | ret = -EBLACKLISTED; | |
3587 | break; | |
3588 | } | |
34f55d0b DY |
3589 | if (!timeout) { |
3590 | rbd_warn(rbd_dev, "timed out waiting for lock"); | |
3591 | ret = -ETIMEDOUT; | |
3592 | break; | |
3593 | } | |
2f18d466 | 3594 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); |
87c0fded | 3595 | |
ed95b21a | 3596 | finish_wait(&rbd_dev->lock_waitq, &wait); |
2f18d466 | 3597 | return ret; |
ed95b21a ID |
3598 | } |
3599 | ||
7ad18afa | 3600 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3601 | { |
7ad18afa CH |
3602 | struct request *rq = blk_mq_rq_from_pdu(work); |
3603 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3604 | struct rbd_img_request *img_request; |
4e752f0a | 3605 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3606 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3607 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3608 | enum obj_operation_type op_type; |
4e752f0a | 3609 | u64 mapping_size; |
80de1912 | 3610 | bool must_be_locked; |
bf0d5f50 AE |
3611 | int result; |
3612 | ||
aebf526b CH |
3613 | switch (req_op(rq)) { |
3614 | case REQ_OP_DISCARD: | |
6ac56951 | 3615 | case REQ_OP_WRITE_ZEROES: |
90e98c52 | 3616 | op_type = OBJ_OP_DISCARD; |
aebf526b CH |
3617 | break; |
3618 | case REQ_OP_WRITE: | |
6d2940c8 | 3619 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
3620 | break; |
3621 | case REQ_OP_READ: | |
6d2940c8 | 3622 | op_type = OBJ_OP_READ; |
aebf526b CH |
3623 | break; |
3624 | default: | |
3625 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
3626 | result = -EIO; | |
3627 | goto err; | |
3628 | } | |
6d2940c8 | 3629 | |
bc1ecc65 | 3630 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3631 | |
bc1ecc65 ID |
3632 | if (!length) { |
3633 | dout("%s: zero-length request\n", __func__); | |
3634 | result = 0; | |
3635 | goto err_rq; | |
3636 | } | |
bf0d5f50 | 3637 | |
9568c93e ID |
3638 | rbd_assert(op_type == OBJ_OP_READ || |
3639 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 3640 | |
bc1ecc65 ID |
3641 | /* |
3642 | * Quit early if the mapped snapshot no longer exists. It's | |
3643 | * still possible the snapshot will have disappeared by the | |
3644 | * time our request arrives at the osd, but there's no sense in | |
3645 | * sending it if we already know. | |
3646 | */ | |
3647 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3648 | dout("request for non-existent snapshot"); | |
3649 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3650 | result = -ENXIO; | |
3651 | goto err_rq; | |
3652 | } | |
4dda41d3 | 3653 | |
bc1ecc65 ID |
3654 | if (offset && length > U64_MAX - offset + 1) { |
3655 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3656 | length); | |
3657 | result = -EINVAL; | |
3658 | goto err_rq; /* Shouldn't happen */ | |
3659 | } | |
4dda41d3 | 3660 | |
7ad18afa CH |
3661 | blk_mq_start_request(rq); |
3662 | ||
4e752f0a JD |
3663 | down_read(&rbd_dev->header_rwsem); |
3664 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3665 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3666 | snapc = rbd_dev->header.snapc; |
3667 | ceph_get_snap_context(snapc); | |
3668 | } | |
3669 | up_read(&rbd_dev->header_rwsem); | |
3670 | ||
3671 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3672 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3673 | length, mapping_size); |
bc1ecc65 ID |
3674 | result = -EIO; |
3675 | goto err_rq; | |
3676 | } | |
bf0d5f50 | 3677 | |
f9bebd58 ID |
3678 | must_be_locked = |
3679 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
3680 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
3681 | if (must_be_locked) { |
3682 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 ID |
3683 | result = rbd_wait_state_locked(rbd_dev, |
3684 | !rbd_dev->opts->exclusive); | |
3685 | if (result) | |
87c0fded | 3686 | goto err_unlock; |
ed95b21a ID |
3687 | } |
3688 | ||
dfd9875f | 3689 | img_request = rbd_img_request_create(rbd_dev, op_type, snapc); |
bc1ecc65 ID |
3690 | if (!img_request) { |
3691 | result = -ENOMEM; | |
ed95b21a | 3692 | goto err_unlock; |
bc1ecc65 ID |
3693 | } |
3694 | img_request->rq = rq; | |
70b16db8 | 3695 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3696 | |
90e98c52 | 3697 | if (op_type == OBJ_OP_DISCARD) |
5a237819 | 3698 | result = rbd_img_fill_nodata(img_request, offset, length); |
90e98c52 | 3699 | else |
5a237819 ID |
3700 | result = rbd_img_fill_from_bio(img_request, offset, length, |
3701 | rq->bio); | |
bc1ecc65 ID |
3702 | if (result) |
3703 | goto err_img_request; | |
bf0d5f50 | 3704 | |
efbd1a11 | 3705 | rbd_img_request_submit(img_request); |
ed95b21a ID |
3706 | if (must_be_locked) |
3707 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 3708 | return; |
bf0d5f50 | 3709 | |
bc1ecc65 ID |
3710 | err_img_request: |
3711 | rbd_img_request_put(img_request); | |
ed95b21a ID |
3712 | err_unlock: |
3713 | if (must_be_locked) | |
3714 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
3715 | err_rq: |
3716 | if (result) | |
3717 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3718 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3719 | ceph_put_snap_context(snapc); |
7ad18afa | 3720 | err: |
2a842aca | 3721 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 3722 | } |
bf0d5f50 | 3723 | |
fc17b653 | 3724 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 3725 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 3726 | { |
7ad18afa CH |
3727 | struct request *rq = bd->rq; |
3728 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3729 | |
7ad18afa | 3730 | queue_work(rbd_wq, work); |
fc17b653 | 3731 | return BLK_STS_OK; |
bf0d5f50 AE |
3732 | } |
3733 | ||
602adf40 YS |
3734 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3735 | { | |
5769ed0c ID |
3736 | blk_cleanup_queue(rbd_dev->disk->queue); |
3737 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
3738 | put_disk(rbd_dev->disk); | |
a0cab924 | 3739 | rbd_dev->disk = NULL; |
602adf40 YS |
3740 | } |
3741 | ||
788e2df3 | 3742 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
3743 | struct ceph_object_id *oid, |
3744 | struct ceph_object_locator *oloc, | |
3745 | void *buf, int buf_len) | |
788e2df3 AE |
3746 | |
3747 | { | |
fe5478e0 ID |
3748 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3749 | struct ceph_osd_request *req; | |
3750 | struct page **pages; | |
3751 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
3752 | int ret; |
3753 | ||
fe5478e0 ID |
3754 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
3755 | if (!req) | |
3756 | return -ENOMEM; | |
788e2df3 | 3757 | |
fe5478e0 ID |
3758 | ceph_oid_copy(&req->r_base_oid, oid); |
3759 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
3760 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 3761 | |
fe5478e0 | 3762 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
788e2df3 | 3763 | if (ret) |
fe5478e0 | 3764 | goto out_req; |
788e2df3 | 3765 | |
fe5478e0 ID |
3766 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
3767 | if (IS_ERR(pages)) { | |
3768 | ret = PTR_ERR(pages); | |
3769 | goto out_req; | |
3770 | } | |
1ceae7ef | 3771 | |
fe5478e0 ID |
3772 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
3773 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
3774 | true); | |
3775 | ||
3776 | ceph_osdc_start_request(osdc, req, false); | |
3777 | ret = ceph_osdc_wait_request(osdc, req); | |
3778 | if (ret >= 0) | |
3779 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 3780 | |
fe5478e0 ID |
3781 | out_req: |
3782 | ceph_osdc_put_request(req); | |
788e2df3 AE |
3783 | return ret; |
3784 | } | |
3785 | ||
602adf40 | 3786 | /* |
662518b1 AE |
3787 | * Read the complete header for the given rbd device. On successful |
3788 | * return, the rbd_dev->header field will contain up-to-date | |
3789 | * information about the image. | |
602adf40 | 3790 | */ |
99a41ebc | 3791 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3792 | { |
4156d998 | 3793 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3794 | u32 snap_count = 0; |
4156d998 AE |
3795 | u64 names_size = 0; |
3796 | u32 want_count; | |
3797 | int ret; | |
602adf40 | 3798 | |
00f1f36f | 3799 | /* |
4156d998 AE |
3800 | * The complete header will include an array of its 64-bit |
3801 | * snapshot ids, followed by the names of those snapshots as | |
3802 | * a contiguous block of NUL-terminated strings. Note that | |
3803 | * the number of snapshots could change by the time we read | |
3804 | * it in, in which case we re-read it. | |
00f1f36f | 3805 | */ |
4156d998 AE |
3806 | do { |
3807 | size_t size; | |
3808 | ||
3809 | kfree(ondisk); | |
3810 | ||
3811 | size = sizeof (*ondisk); | |
3812 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3813 | size += names_size; | |
3814 | ondisk = kmalloc(size, GFP_KERNEL); | |
3815 | if (!ondisk) | |
662518b1 | 3816 | return -ENOMEM; |
4156d998 | 3817 | |
fe5478e0 ID |
3818 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
3819 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 3820 | if (ret < 0) |
662518b1 | 3821 | goto out; |
c0cd10db | 3822 | if ((size_t)ret < size) { |
4156d998 | 3823 | ret = -ENXIO; |
06ecc6cb AE |
3824 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3825 | size, ret); | |
662518b1 | 3826 | goto out; |
4156d998 AE |
3827 | } |
3828 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3829 | ret = -ENXIO; | |
06ecc6cb | 3830 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3831 | goto out; |
81e759fb | 3832 | } |
602adf40 | 3833 | |
4156d998 AE |
3834 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3835 | want_count = snap_count; | |
3836 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3837 | } while (snap_count != want_count); | |
00f1f36f | 3838 | |
662518b1 AE |
3839 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3840 | out: | |
4156d998 AE |
3841 | kfree(ondisk); |
3842 | ||
3843 | return ret; | |
602adf40 YS |
3844 | } |
3845 | ||
15228ede AE |
3846 | /* |
3847 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3848 | * has disappeared from the (just updated) snapshot context. | |
3849 | */ | |
3850 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3851 | { | |
3852 | u64 snap_id; | |
3853 | ||
3854 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3855 | return; | |
3856 | ||
3857 | snap_id = rbd_dev->spec->snap_id; | |
3858 | if (snap_id == CEPH_NOSNAP) | |
3859 | return; | |
3860 | ||
3861 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3862 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3863 | } | |
3864 | ||
9875201e JD |
3865 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3866 | { | |
3867 | sector_t size; | |
9875201e JD |
3868 | |
3869 | /* | |
811c6688 ID |
3870 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3871 | * try to update its size. If REMOVING is set, updating size | |
3872 | * is just useless work since the device can't be opened. | |
9875201e | 3873 | */ |
811c6688 ID |
3874 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3875 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3876 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3877 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3878 | set_capacity(rbd_dev->disk, size); | |
3879 | revalidate_disk(rbd_dev->disk); | |
3880 | } | |
3881 | } | |
3882 | ||
cc4a38bd | 3883 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3884 | { |
e627db08 | 3885 | u64 mapping_size; |
1fe5e993 AE |
3886 | int ret; |
3887 | ||
cfbf6377 | 3888 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3889 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3890 | |
3891 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 3892 | if (ret) |
73e39e4d | 3893 | goto out; |
15228ede | 3894 | |
e8f59b59 ID |
3895 | /* |
3896 | * If there is a parent, see if it has disappeared due to the | |
3897 | * mapped image getting flattened. | |
3898 | */ | |
3899 | if (rbd_dev->parent) { | |
3900 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3901 | if (ret) | |
73e39e4d | 3902 | goto out; |
e8f59b59 ID |
3903 | } |
3904 | ||
5ff1108c | 3905 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 3906 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
3907 | } else { |
3908 | /* validate mapped snapshot's EXISTS flag */ | |
3909 | rbd_exists_validate(rbd_dev); | |
3910 | } | |
15228ede | 3911 | |
73e39e4d | 3912 | out: |
cfbf6377 | 3913 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 3914 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 3915 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3916 | |
73e39e4d | 3917 | return ret; |
1fe5e993 AE |
3918 | } |
3919 | ||
d6296d39 CH |
3920 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
3921 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
3922 | { |
3923 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
3924 | ||
3925 | INIT_WORK(work, rbd_queue_workfn); | |
3926 | return 0; | |
3927 | } | |
3928 | ||
f363b089 | 3929 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 3930 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
3931 | .init_request = rbd_init_request, |
3932 | }; | |
3933 | ||
602adf40 YS |
3934 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3935 | { | |
3936 | struct gendisk *disk; | |
3937 | struct request_queue *q; | |
420efbdf ID |
3938 | unsigned int objset_bytes = |
3939 | rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; | |
7ad18afa | 3940 | int err; |
602adf40 | 3941 | |
602adf40 | 3942 | /* create gendisk info */ |
7e513d43 ID |
3943 | disk = alloc_disk(single_major ? |
3944 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3945 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3946 | if (!disk) |
1fcdb8aa | 3947 | return -ENOMEM; |
602adf40 | 3948 | |
f0f8cef5 | 3949 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3950 | rbd_dev->dev_id); |
602adf40 | 3951 | disk->major = rbd_dev->major; |
dd82fff1 | 3952 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3953 | if (single_major) |
3954 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3955 | disk->fops = &rbd_bd_ops; |
3956 | disk->private_data = rbd_dev; | |
3957 | ||
7ad18afa CH |
3958 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
3959 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 3960 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 3961 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 3962 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
3963 | rbd_dev->tag_set.nr_hw_queues = 1; |
3964 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
3965 | ||
3966 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
3967 | if (err) | |
602adf40 | 3968 | goto out_disk; |
029bcbd8 | 3969 | |
7ad18afa CH |
3970 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
3971 | if (IS_ERR(q)) { | |
3972 | err = PTR_ERR(q); | |
3973 | goto out_tag_set; | |
3974 | } | |
3975 | ||
8b904b5b | 3976 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
d8a2c89c | 3977 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
593a9e7b | 3978 | |
420efbdf | 3979 | blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
0d9fde4f | 3980 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 3981 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 3982 | blk_queue_max_segment_size(q, UINT_MAX); |
420efbdf ID |
3983 | blk_queue_io_min(q, objset_bytes); |
3984 | blk_queue_io_opt(q, objset_bytes); | |
029bcbd8 | 3985 | |
d9360540 ID |
3986 | if (rbd_dev->opts->trim) { |
3987 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
3988 | q->limits.discard_granularity = objset_bytes; | |
3989 | blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
3990 | blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
3991 | } | |
90e98c52 | 3992 | |
bae818ee | 3993 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 3994 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 3995 | |
5769ed0c ID |
3996 | /* |
3997 | * disk_release() expects a queue ref from add_disk() and will | |
3998 | * put it. Hold an extra ref until add_disk() is called. | |
3999 | */ | |
4000 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 4001 | disk->queue = q; |
602adf40 YS |
4002 | q->queuedata = rbd_dev; |
4003 | ||
4004 | rbd_dev->disk = disk; | |
602adf40 | 4005 | |
602adf40 | 4006 | return 0; |
7ad18afa CH |
4007 | out_tag_set: |
4008 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
4009 | out_disk: |
4010 | put_disk(disk); | |
7ad18afa | 4011 | return err; |
602adf40 YS |
4012 | } |
4013 | ||
dfc5606d YS |
4014 | /* |
4015 | sysfs | |
4016 | */ | |
4017 | ||
593a9e7b AE |
4018 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
4019 | { | |
4020 | return container_of(dev, struct rbd_device, dev); | |
4021 | } | |
4022 | ||
dfc5606d YS |
4023 | static ssize_t rbd_size_show(struct device *dev, |
4024 | struct device_attribute *attr, char *buf) | |
4025 | { | |
593a9e7b | 4026 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 4027 | |
fc71d833 AE |
4028 | return sprintf(buf, "%llu\n", |
4029 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
4030 | } |
4031 | ||
34b13184 AE |
4032 | /* |
4033 | * Note this shows the features for whatever's mapped, which is not | |
4034 | * necessarily the base image. | |
4035 | */ | |
4036 | static ssize_t rbd_features_show(struct device *dev, | |
4037 | struct device_attribute *attr, char *buf) | |
4038 | { | |
4039 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4040 | ||
4041 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4042 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4043 | } |
4044 | ||
dfc5606d YS |
4045 | static ssize_t rbd_major_show(struct device *dev, |
4046 | struct device_attribute *attr, char *buf) | |
4047 | { | |
593a9e7b | 4048 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4049 | |
fc71d833 AE |
4050 | if (rbd_dev->major) |
4051 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4052 | ||
4053 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4054 | } |
4055 | ||
4056 | static ssize_t rbd_minor_show(struct device *dev, | |
4057 | struct device_attribute *attr, char *buf) | |
4058 | { | |
4059 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4060 | |
dd82fff1 | 4061 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4062 | } |
4063 | ||
005a07bf ID |
4064 | static ssize_t rbd_client_addr_show(struct device *dev, |
4065 | struct device_attribute *attr, char *buf) | |
4066 | { | |
4067 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4068 | struct ceph_entity_addr *client_addr = | |
4069 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4070 | ||
4071 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4072 | le32_to_cpu(client_addr->nonce)); | |
4073 | } | |
4074 | ||
dfc5606d YS |
4075 | static ssize_t rbd_client_id_show(struct device *dev, |
4076 | struct device_attribute *attr, char *buf) | |
602adf40 | 4077 | { |
593a9e7b | 4078 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4079 | |
1dbb4399 | 4080 | return sprintf(buf, "client%lld\n", |
033268a5 | 4081 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4082 | } |
4083 | ||
267fb90b MC |
4084 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4085 | struct device_attribute *attr, char *buf) | |
4086 | { | |
4087 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4088 | ||
4089 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4090 | } | |
4091 | ||
0d6d1e9c MC |
4092 | static ssize_t rbd_config_info_show(struct device *dev, |
4093 | struct device_attribute *attr, char *buf) | |
4094 | { | |
4095 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4096 | ||
4097 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4098 | } |
4099 | ||
dfc5606d YS |
4100 | static ssize_t rbd_pool_show(struct device *dev, |
4101 | struct device_attribute *attr, char *buf) | |
602adf40 | 4102 | { |
593a9e7b | 4103 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4104 | |
0d7dbfce | 4105 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4106 | } |
4107 | ||
9bb2f334 AE |
4108 | static ssize_t rbd_pool_id_show(struct device *dev, |
4109 | struct device_attribute *attr, char *buf) | |
4110 | { | |
4111 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4112 | ||
0d7dbfce | 4113 | return sprintf(buf, "%llu\n", |
fc71d833 | 4114 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4115 | } |
4116 | ||
dfc5606d YS |
4117 | static ssize_t rbd_name_show(struct device *dev, |
4118 | struct device_attribute *attr, char *buf) | |
4119 | { | |
593a9e7b | 4120 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4121 | |
a92ffdf8 AE |
4122 | if (rbd_dev->spec->image_name) |
4123 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4124 | ||
4125 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4126 | } |
4127 | ||
589d30e0 AE |
4128 | static ssize_t rbd_image_id_show(struct device *dev, |
4129 | struct device_attribute *attr, char *buf) | |
4130 | { | |
4131 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4132 | ||
0d7dbfce | 4133 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4134 | } |
4135 | ||
34b13184 AE |
4136 | /* |
4137 | * Shows the name of the currently-mapped snapshot (or | |
4138 | * RBD_SNAP_HEAD_NAME for the base image). | |
4139 | */ | |
dfc5606d YS |
4140 | static ssize_t rbd_snap_show(struct device *dev, |
4141 | struct device_attribute *attr, | |
4142 | char *buf) | |
4143 | { | |
593a9e7b | 4144 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4145 | |
0d7dbfce | 4146 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4147 | } |
4148 | ||
92a58671 MC |
4149 | static ssize_t rbd_snap_id_show(struct device *dev, |
4150 | struct device_attribute *attr, char *buf) | |
4151 | { | |
4152 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4153 | ||
4154 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4155 | } | |
4156 | ||
86b00e0d | 4157 | /* |
ff96128f ID |
4158 | * For a v2 image, shows the chain of parent images, separated by empty |
4159 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4160 | * image)". | |
86b00e0d AE |
4161 | */ |
4162 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4163 | struct device_attribute *attr, |
4164 | char *buf) | |
86b00e0d AE |
4165 | { |
4166 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4167 | ssize_t count = 0; |
86b00e0d | 4168 | |
ff96128f | 4169 | if (!rbd_dev->parent) |
86b00e0d AE |
4170 | return sprintf(buf, "(no parent image)\n"); |
4171 | ||
ff96128f ID |
4172 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4173 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4174 | ||
4175 | count += sprintf(&buf[count], "%s" | |
4176 | "pool_id %llu\npool_name %s\n" | |
4177 | "image_id %s\nimage_name %s\n" | |
4178 | "snap_id %llu\nsnap_name %s\n" | |
4179 | "overlap %llu\n", | |
4180 | !count ? "" : "\n", /* first? */ | |
4181 | spec->pool_id, spec->pool_name, | |
4182 | spec->image_id, spec->image_name ?: "(unknown)", | |
4183 | spec->snap_id, spec->snap_name, | |
4184 | rbd_dev->parent_overlap); | |
4185 | } | |
4186 | ||
4187 | return count; | |
86b00e0d AE |
4188 | } |
4189 | ||
dfc5606d YS |
4190 | static ssize_t rbd_image_refresh(struct device *dev, |
4191 | struct device_attribute *attr, | |
4192 | const char *buf, | |
4193 | size_t size) | |
4194 | { | |
593a9e7b | 4195 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4196 | int ret; |
602adf40 | 4197 | |
cc4a38bd | 4198 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4199 | if (ret) |
52bb1f9b | 4200 | return ret; |
b813623a | 4201 | |
52bb1f9b | 4202 | return size; |
dfc5606d | 4203 | } |
602adf40 | 4204 | |
dfc5606d | 4205 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 4206 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 4207 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 4208 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
005a07bf | 4209 | static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
dfc5606d | 4210 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
267fb90b | 4211 | static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
0d6d1e9c | 4212 | static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL); |
dfc5606d | 4213 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
9bb2f334 | 4214 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 4215 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 4216 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
4217 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
4218 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
92a58671 | 4219 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
86b00e0d | 4220 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
4221 | |
4222 | static struct attribute *rbd_attrs[] = { | |
4223 | &dev_attr_size.attr, | |
34b13184 | 4224 | &dev_attr_features.attr, |
dfc5606d | 4225 | &dev_attr_major.attr, |
dd82fff1 | 4226 | &dev_attr_minor.attr, |
005a07bf | 4227 | &dev_attr_client_addr.attr, |
dfc5606d | 4228 | &dev_attr_client_id.attr, |
267fb90b | 4229 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4230 | &dev_attr_config_info.attr, |
dfc5606d | 4231 | &dev_attr_pool.attr, |
9bb2f334 | 4232 | &dev_attr_pool_id.attr, |
dfc5606d | 4233 | &dev_attr_name.attr, |
589d30e0 | 4234 | &dev_attr_image_id.attr, |
dfc5606d | 4235 | &dev_attr_current_snap.attr, |
92a58671 | 4236 | &dev_attr_snap_id.attr, |
86b00e0d | 4237 | &dev_attr_parent.attr, |
dfc5606d | 4238 | &dev_attr_refresh.attr, |
dfc5606d YS |
4239 | NULL |
4240 | }; | |
4241 | ||
4242 | static struct attribute_group rbd_attr_group = { | |
4243 | .attrs = rbd_attrs, | |
4244 | }; | |
4245 | ||
4246 | static const struct attribute_group *rbd_attr_groups[] = { | |
4247 | &rbd_attr_group, | |
4248 | NULL | |
4249 | }; | |
4250 | ||
6cac4695 | 4251 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4252 | |
b9942bc9 | 4253 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4254 | .name = "rbd", |
4255 | .groups = rbd_attr_groups, | |
6cac4695 | 4256 | .release = rbd_dev_release, |
dfc5606d YS |
4257 | }; |
4258 | ||
8b8fb99c AE |
4259 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4260 | { | |
4261 | kref_get(&spec->kref); | |
4262 | ||
4263 | return spec; | |
4264 | } | |
4265 | ||
4266 | static void rbd_spec_free(struct kref *kref); | |
4267 | static void rbd_spec_put(struct rbd_spec *spec) | |
4268 | { | |
4269 | if (spec) | |
4270 | kref_put(&spec->kref, rbd_spec_free); | |
4271 | } | |
4272 | ||
4273 | static struct rbd_spec *rbd_spec_alloc(void) | |
4274 | { | |
4275 | struct rbd_spec *spec; | |
4276 | ||
4277 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4278 | if (!spec) | |
4279 | return NULL; | |
04077599 ID |
4280 | |
4281 | spec->pool_id = CEPH_NOPOOL; | |
4282 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4283 | kref_init(&spec->kref); |
4284 | ||
8b8fb99c AE |
4285 | return spec; |
4286 | } | |
4287 | ||
4288 | static void rbd_spec_free(struct kref *kref) | |
4289 | { | |
4290 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4291 | ||
4292 | kfree(spec->pool_name); | |
4293 | kfree(spec->image_id); | |
4294 | kfree(spec->image_name); | |
4295 | kfree(spec->snap_name); | |
4296 | kfree(spec); | |
4297 | } | |
4298 | ||
1643dfa4 | 4299 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4300 | { |
99d16943 | 4301 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4302 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4303 | |
c41d13a3 | 4304 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4305 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4306 | kfree(rbd_dev->config_info); |
c41d13a3 | 4307 | |
dd5ac32d ID |
4308 | rbd_put_client(rbd_dev->rbd_client); |
4309 | rbd_spec_put(rbd_dev->spec); | |
4310 | kfree(rbd_dev->opts); | |
4311 | kfree(rbd_dev); | |
1643dfa4 ID |
4312 | } |
4313 | ||
4314 | static void rbd_dev_release(struct device *dev) | |
4315 | { | |
4316 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4317 | bool need_put = !!rbd_dev->opts; | |
4318 | ||
4319 | if (need_put) { | |
4320 | destroy_workqueue(rbd_dev->task_wq); | |
4321 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4322 | } | |
4323 | ||
4324 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4325 | |
4326 | /* | |
4327 | * This is racy, but way better than putting module outside of | |
4328 | * the release callback. The race window is pretty small, so | |
4329 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4330 | */ | |
4331 | if (need_put) | |
4332 | module_put(THIS_MODULE); | |
4333 | } | |
4334 | ||
1643dfa4 ID |
4335 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4336 | struct rbd_spec *spec) | |
c53d5893 AE |
4337 | { |
4338 | struct rbd_device *rbd_dev; | |
4339 | ||
1643dfa4 | 4340 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4341 | if (!rbd_dev) |
4342 | return NULL; | |
4343 | ||
4344 | spin_lock_init(&rbd_dev->lock); | |
4345 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4346 | init_rwsem(&rbd_dev->header_rwsem); |
4347 | ||
7e97332e | 4348 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4349 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4350 | rbd_dev->header_oloc.pool = spec->pool_id; |
c41d13a3 | 4351 | |
99d16943 ID |
4352 | mutex_init(&rbd_dev->watch_mutex); |
4353 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4354 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4355 | ||
ed95b21a ID |
4356 | init_rwsem(&rbd_dev->lock_rwsem); |
4357 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4358 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4359 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4360 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4361 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4362 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4363 | ||
dd5ac32d ID |
4364 | rbd_dev->dev.bus = &rbd_bus_type; |
4365 | rbd_dev->dev.type = &rbd_device_type; | |
4366 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4367 | device_initialize(&rbd_dev->dev); |
4368 | ||
c53d5893 | 4369 | rbd_dev->rbd_client = rbdc; |
d147543d | 4370 | rbd_dev->spec = spec; |
0903e875 | 4371 | |
1643dfa4 ID |
4372 | return rbd_dev; |
4373 | } | |
4374 | ||
4375 | /* | |
4376 | * Create a mapping rbd_dev. | |
4377 | */ | |
4378 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4379 | struct rbd_spec *spec, | |
4380 | struct rbd_options *opts) | |
4381 | { | |
4382 | struct rbd_device *rbd_dev; | |
4383 | ||
4384 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4385 | if (!rbd_dev) | |
4386 | return NULL; | |
4387 | ||
4388 | rbd_dev->opts = opts; | |
4389 | ||
4390 | /* get an id and fill in device name */ | |
4391 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4392 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4393 | GFP_KERNEL); | |
4394 | if (rbd_dev->dev_id < 0) | |
4395 | goto fail_rbd_dev; | |
4396 | ||
4397 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4398 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4399 | rbd_dev->name); | |
4400 | if (!rbd_dev->task_wq) | |
4401 | goto fail_dev_id; | |
dd5ac32d | 4402 | |
1643dfa4 ID |
4403 | /* we have a ref from do_rbd_add() */ |
4404 | __module_get(THIS_MODULE); | |
dd5ac32d | 4405 | |
1643dfa4 | 4406 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4407 | return rbd_dev; |
1643dfa4 ID |
4408 | |
4409 | fail_dev_id: | |
4410 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4411 | fail_rbd_dev: | |
4412 | rbd_dev_free(rbd_dev); | |
4413 | return NULL; | |
c53d5893 AE |
4414 | } |
4415 | ||
4416 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4417 | { | |
dd5ac32d ID |
4418 | if (rbd_dev) |
4419 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4420 | } |
4421 | ||
9d475de5 AE |
4422 | /* |
4423 | * Get the size and object order for an image snapshot, or if | |
4424 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4425 | * image. | |
4426 | */ | |
4427 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4428 | u8 *order, u64 *snap_size) | |
4429 | { | |
4430 | __le64 snapid = cpu_to_le64(snap_id); | |
4431 | int ret; | |
4432 | struct { | |
4433 | u8 order; | |
4434 | __le64 size; | |
4435 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4436 | ||
ecd4a68a ID |
4437 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4438 | &rbd_dev->header_oloc, "get_size", | |
4439 | &snapid, sizeof(snapid), | |
4440 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4441 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4442 | if (ret < 0) |
4443 | return ret; | |
57385b51 AE |
4444 | if (ret < sizeof (size_buf)) |
4445 | return -ERANGE; | |
9d475de5 | 4446 | |
c3545579 | 4447 | if (order) { |
c86f86e9 | 4448 | *order = size_buf.order; |
c3545579 JD |
4449 | dout(" order %u", (unsigned int)*order); |
4450 | } | |
9d475de5 AE |
4451 | *snap_size = le64_to_cpu(size_buf.size); |
4452 | ||
c3545579 JD |
4453 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4454 | (unsigned long long)snap_id, | |
57385b51 | 4455 | (unsigned long long)*snap_size); |
9d475de5 AE |
4456 | |
4457 | return 0; | |
4458 | } | |
4459 | ||
4460 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4461 | { | |
4462 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4463 | &rbd_dev->header.obj_order, | |
4464 | &rbd_dev->header.image_size); | |
4465 | } | |
4466 | ||
1e130199 AE |
4467 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4468 | { | |
4469 | void *reply_buf; | |
4470 | int ret; | |
4471 | void *p; | |
4472 | ||
4473 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4474 | if (!reply_buf) | |
4475 | return -ENOMEM; | |
4476 | ||
ecd4a68a ID |
4477 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4478 | &rbd_dev->header_oloc, "get_object_prefix", | |
4479 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4480 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4481 | if (ret < 0) |
4482 | goto out; | |
4483 | ||
4484 | p = reply_buf; | |
4485 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4486 | p + ret, NULL, GFP_NOIO); |
4487 | ret = 0; | |
1e130199 AE |
4488 | |
4489 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4490 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4491 | rbd_dev->header.object_prefix = NULL; | |
4492 | } else { | |
4493 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4494 | } | |
1e130199 AE |
4495 | out: |
4496 | kfree(reply_buf); | |
4497 | ||
4498 | return ret; | |
4499 | } | |
4500 | ||
b1b5402a AE |
4501 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4502 | u64 *snap_features) | |
4503 | { | |
4504 | __le64 snapid = cpu_to_le64(snap_id); | |
4505 | struct { | |
4506 | __le64 features; | |
4507 | __le64 incompat; | |
4157976b | 4508 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4509 | u64 unsup; |
b1b5402a AE |
4510 | int ret; |
4511 | ||
ecd4a68a ID |
4512 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4513 | &rbd_dev->header_oloc, "get_features", | |
4514 | &snapid, sizeof(snapid), | |
4515 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4516 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4517 | if (ret < 0) |
4518 | return ret; | |
57385b51 AE |
4519 | if (ret < sizeof (features_buf)) |
4520 | return -ERANGE; | |
d889140c | 4521 | |
d3767f0f ID |
4522 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4523 | if (unsup) { | |
4524 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4525 | unsup); | |
b8f5c6ed | 4526 | return -ENXIO; |
d3767f0f | 4527 | } |
d889140c | 4528 | |
b1b5402a AE |
4529 | *snap_features = le64_to_cpu(features_buf.features); |
4530 | ||
4531 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4532 | (unsigned long long)snap_id, |
4533 | (unsigned long long)*snap_features, | |
4534 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4535 | |
4536 | return 0; | |
4537 | } | |
4538 | ||
4539 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4540 | { | |
4541 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4542 | &rbd_dev->header.features); | |
4543 | } | |
4544 | ||
86b00e0d AE |
4545 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4546 | { | |
4547 | struct rbd_spec *parent_spec; | |
4548 | size_t size; | |
4549 | void *reply_buf = NULL; | |
4550 | __le64 snapid; | |
4551 | void *p; | |
4552 | void *end; | |
642a2537 | 4553 | u64 pool_id; |
86b00e0d | 4554 | char *image_id; |
3b5cf2a2 | 4555 | u64 snap_id; |
86b00e0d | 4556 | u64 overlap; |
86b00e0d AE |
4557 | int ret; |
4558 | ||
4559 | parent_spec = rbd_spec_alloc(); | |
4560 | if (!parent_spec) | |
4561 | return -ENOMEM; | |
4562 | ||
4563 | size = sizeof (__le64) + /* pool_id */ | |
4564 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4565 | sizeof (__le64) + /* snap_id */ | |
4566 | sizeof (__le64); /* overlap */ | |
4567 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4568 | if (!reply_buf) { | |
4569 | ret = -ENOMEM; | |
4570 | goto out_err; | |
4571 | } | |
4572 | ||
4d9b67cd | 4573 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
ecd4a68a ID |
4574 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4575 | &rbd_dev->header_oloc, "get_parent", | |
4576 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4577 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4578 | if (ret < 0) |
4579 | goto out_err; | |
4580 | ||
86b00e0d | 4581 | p = reply_buf; |
57385b51 AE |
4582 | end = reply_buf + ret; |
4583 | ret = -ERANGE; | |
642a2537 | 4584 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4585 | if (pool_id == CEPH_NOPOOL) { |
4586 | /* | |
4587 | * Either the parent never existed, or we have | |
4588 | * record of it but the image got flattened so it no | |
4589 | * longer has a parent. When the parent of a | |
4590 | * layered image disappears we immediately set the | |
4591 | * overlap to 0. The effect of this is that all new | |
4592 | * requests will be treated as if the image had no | |
4593 | * parent. | |
4594 | */ | |
4595 | if (rbd_dev->parent_overlap) { | |
4596 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4597 | rbd_dev_parent_put(rbd_dev); |
4598 | pr_info("%s: clone image has been flattened\n", | |
4599 | rbd_dev->disk->disk_name); | |
4600 | } | |
4601 | ||
86b00e0d | 4602 | goto out; /* No parent? No problem. */ |
392a9dad | 4603 | } |
86b00e0d | 4604 | |
0903e875 AE |
4605 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4606 | ||
4607 | ret = -EIO; | |
642a2537 | 4608 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4609 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4610 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4611 | goto out_err; |
c0cd10db | 4612 | } |
0903e875 | 4613 | |
979ed480 | 4614 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4615 | if (IS_ERR(image_id)) { |
4616 | ret = PTR_ERR(image_id); | |
4617 | goto out_err; | |
4618 | } | |
3b5cf2a2 | 4619 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4620 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4621 | ||
3b5cf2a2 AE |
4622 | /* |
4623 | * The parent won't change (except when the clone is | |
4624 | * flattened, already handled that). So we only need to | |
4625 | * record the parent spec we have not already done so. | |
4626 | */ | |
4627 | if (!rbd_dev->parent_spec) { | |
4628 | parent_spec->pool_id = pool_id; | |
4629 | parent_spec->image_id = image_id; | |
4630 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4631 | rbd_dev->parent_spec = parent_spec; |
4632 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4633 | } else { |
4634 | kfree(image_id); | |
3b5cf2a2 AE |
4635 | } |
4636 | ||
4637 | /* | |
cf32bd9c ID |
4638 | * We always update the parent overlap. If it's zero we issue |
4639 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4640 | */ |
3b5cf2a2 | 4641 | if (!overlap) { |
3b5cf2a2 | 4642 | if (parent_spec) { |
cf32bd9c ID |
4643 | /* refresh, careful to warn just once */ |
4644 | if (rbd_dev->parent_overlap) | |
4645 | rbd_warn(rbd_dev, | |
4646 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4647 | } else { |
cf32bd9c ID |
4648 | /* initial probe */ |
4649 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4650 | } |
70cf49cf | 4651 | } |
cf32bd9c ID |
4652 | rbd_dev->parent_overlap = overlap; |
4653 | ||
86b00e0d AE |
4654 | out: |
4655 | ret = 0; | |
4656 | out_err: | |
4657 | kfree(reply_buf); | |
4658 | rbd_spec_put(parent_spec); | |
4659 | ||
4660 | return ret; | |
4661 | } | |
4662 | ||
cc070d59 AE |
4663 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4664 | { | |
4665 | struct { | |
4666 | __le64 stripe_unit; | |
4667 | __le64 stripe_count; | |
4668 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4669 | size_t size = sizeof (striping_info_buf); | |
4670 | void *p; | |
cc070d59 AE |
4671 | int ret; |
4672 | ||
ecd4a68a ID |
4673 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4674 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
4675 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
4676 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4677 | if (ret < 0) | |
4678 | return ret; | |
4679 | if (ret < size) | |
4680 | return -ERANGE; | |
4681 | ||
cc070d59 | 4682 | p = &striping_info_buf; |
b1331852 ID |
4683 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
4684 | rbd_dev->header.stripe_count = ceph_decode_64(&p); | |
cc070d59 AE |
4685 | return 0; |
4686 | } | |
4687 | ||
7e97332e ID |
4688 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
4689 | { | |
4690 | __le64 data_pool_id; | |
4691 | int ret; | |
4692 | ||
4693 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
4694 | &rbd_dev->header_oloc, "get_data_pool", | |
4695 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
4696 | if (ret < 0) | |
4697 | return ret; | |
4698 | if (ret < sizeof(data_pool_id)) | |
4699 | return -EBADMSG; | |
4700 | ||
4701 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
4702 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
4703 | return 0; | |
4704 | } | |
4705 | ||
9e15b77d AE |
4706 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4707 | { | |
ecd4a68a | 4708 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
4709 | size_t image_id_size; |
4710 | char *image_id; | |
4711 | void *p; | |
4712 | void *end; | |
4713 | size_t size; | |
4714 | void *reply_buf = NULL; | |
4715 | size_t len = 0; | |
4716 | char *image_name = NULL; | |
4717 | int ret; | |
4718 | ||
4719 | rbd_assert(!rbd_dev->spec->image_name); | |
4720 | ||
69e7a02f AE |
4721 | len = strlen(rbd_dev->spec->image_id); |
4722 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4723 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4724 | if (!image_id) | |
4725 | return NULL; | |
4726 | ||
4727 | p = image_id; | |
4157976b | 4728 | end = image_id + image_id_size; |
57385b51 | 4729 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4730 | |
4731 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4732 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4733 | if (!reply_buf) | |
4734 | goto out; | |
4735 | ||
ecd4a68a ID |
4736 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
4737 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
4738 | "dir_get_name", image_id, image_id_size, | |
4739 | reply_buf, size); | |
9e15b77d AE |
4740 | if (ret < 0) |
4741 | goto out; | |
4742 | p = reply_buf; | |
f40eb349 AE |
4743 | end = reply_buf + ret; |
4744 | ||
9e15b77d AE |
4745 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4746 | if (IS_ERR(image_name)) | |
4747 | image_name = NULL; | |
4748 | else | |
4749 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4750 | out: | |
4751 | kfree(reply_buf); | |
4752 | kfree(image_id); | |
4753 | ||
4754 | return image_name; | |
4755 | } | |
4756 | ||
2ad3d716 AE |
4757 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4758 | { | |
4759 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4760 | const char *snap_name; | |
4761 | u32 which = 0; | |
4762 | ||
4763 | /* Skip over names until we find the one we are looking for */ | |
4764 | ||
4765 | snap_name = rbd_dev->header.snap_names; | |
4766 | while (which < snapc->num_snaps) { | |
4767 | if (!strcmp(name, snap_name)) | |
4768 | return snapc->snaps[which]; | |
4769 | snap_name += strlen(snap_name) + 1; | |
4770 | which++; | |
4771 | } | |
4772 | return CEPH_NOSNAP; | |
4773 | } | |
4774 | ||
4775 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4776 | { | |
4777 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4778 | u32 which; | |
4779 | bool found = false; | |
4780 | u64 snap_id; | |
4781 | ||
4782 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4783 | const char *snap_name; | |
4784 | ||
4785 | snap_id = snapc->snaps[which]; | |
4786 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4787 | if (IS_ERR(snap_name)) { |
4788 | /* ignore no-longer existing snapshots */ | |
4789 | if (PTR_ERR(snap_name) == -ENOENT) | |
4790 | continue; | |
4791 | else | |
4792 | break; | |
4793 | } | |
2ad3d716 AE |
4794 | found = !strcmp(name, snap_name); |
4795 | kfree(snap_name); | |
4796 | } | |
4797 | return found ? snap_id : CEPH_NOSNAP; | |
4798 | } | |
4799 | ||
4800 | /* | |
4801 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4802 | * no snapshot by that name is found, or if an error occurs. | |
4803 | */ | |
4804 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4805 | { | |
4806 | if (rbd_dev->image_format == 1) | |
4807 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4808 | ||
4809 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4810 | } | |
4811 | ||
9e15b77d | 4812 | /* |
04077599 ID |
4813 | * An image being mapped will have everything but the snap id. |
4814 | */ | |
4815 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4816 | { | |
4817 | struct rbd_spec *spec = rbd_dev->spec; | |
4818 | ||
4819 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4820 | rbd_assert(spec->image_id && spec->image_name); | |
4821 | rbd_assert(spec->snap_name); | |
4822 | ||
4823 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4824 | u64 snap_id; | |
4825 | ||
4826 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4827 | if (snap_id == CEPH_NOSNAP) | |
4828 | return -ENOENT; | |
4829 | ||
4830 | spec->snap_id = snap_id; | |
4831 | } else { | |
4832 | spec->snap_id = CEPH_NOSNAP; | |
4833 | } | |
4834 | ||
4835 | return 0; | |
4836 | } | |
4837 | ||
4838 | /* | |
4839 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4840 | * |
04077599 ID |
4841 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4842 | * can't figure out the name for an image id. | |
9e15b77d | 4843 | */ |
04077599 | 4844 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4845 | { |
2e9f7f1c AE |
4846 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4847 | struct rbd_spec *spec = rbd_dev->spec; | |
4848 | const char *pool_name; | |
4849 | const char *image_name; | |
4850 | const char *snap_name; | |
9e15b77d AE |
4851 | int ret; |
4852 | ||
04077599 ID |
4853 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4854 | rbd_assert(spec->image_id); | |
4855 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4856 | |
2e9f7f1c | 4857 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4858 | |
2e9f7f1c AE |
4859 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4860 | if (!pool_name) { | |
4861 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4862 | return -EIO; |
4863 | } | |
2e9f7f1c AE |
4864 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4865 | if (!pool_name) | |
9e15b77d AE |
4866 | return -ENOMEM; |
4867 | ||
4868 | /* Fetch the image name; tolerate failure here */ | |
4869 | ||
2e9f7f1c AE |
4870 | image_name = rbd_dev_image_name(rbd_dev); |
4871 | if (!image_name) | |
06ecc6cb | 4872 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4873 | |
04077599 | 4874 | /* Fetch the snapshot name */ |
9e15b77d | 4875 | |
2e9f7f1c | 4876 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4877 | if (IS_ERR(snap_name)) { |
4878 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4879 | goto out_err; |
2e9f7f1c AE |
4880 | } |
4881 | ||
4882 | spec->pool_name = pool_name; | |
4883 | spec->image_name = image_name; | |
4884 | spec->snap_name = snap_name; | |
9e15b77d AE |
4885 | |
4886 | return 0; | |
04077599 | 4887 | |
9e15b77d | 4888 | out_err: |
2e9f7f1c AE |
4889 | kfree(image_name); |
4890 | kfree(pool_name); | |
9e15b77d AE |
4891 | return ret; |
4892 | } | |
4893 | ||
cc4a38bd | 4894 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4895 | { |
4896 | size_t size; | |
4897 | int ret; | |
4898 | void *reply_buf; | |
4899 | void *p; | |
4900 | void *end; | |
4901 | u64 seq; | |
4902 | u32 snap_count; | |
4903 | struct ceph_snap_context *snapc; | |
4904 | u32 i; | |
4905 | ||
4906 | /* | |
4907 | * We'll need room for the seq value (maximum snapshot id), | |
4908 | * snapshot count, and array of that many snapshot ids. | |
4909 | * For now we have a fixed upper limit on the number we're | |
4910 | * prepared to receive. | |
4911 | */ | |
4912 | size = sizeof (__le64) + sizeof (__le32) + | |
4913 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4914 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4915 | if (!reply_buf) | |
4916 | return -ENOMEM; | |
4917 | ||
ecd4a68a ID |
4918 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4919 | &rbd_dev->header_oloc, "get_snapcontext", | |
4920 | NULL, 0, reply_buf, size); | |
36be9a76 | 4921 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4922 | if (ret < 0) |
4923 | goto out; | |
4924 | ||
35d489f9 | 4925 | p = reply_buf; |
57385b51 AE |
4926 | end = reply_buf + ret; |
4927 | ret = -ERANGE; | |
35d489f9 AE |
4928 | ceph_decode_64_safe(&p, end, seq, out); |
4929 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4930 | ||
4931 | /* | |
4932 | * Make sure the reported number of snapshot ids wouldn't go | |
4933 | * beyond the end of our buffer. But before checking that, | |
4934 | * make sure the computed size of the snapshot context we | |
4935 | * allocate is representable in a size_t. | |
4936 | */ | |
4937 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4938 | / sizeof (u64)) { | |
4939 | ret = -EINVAL; | |
4940 | goto out; | |
4941 | } | |
4942 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4943 | goto out; | |
468521c1 | 4944 | ret = 0; |
35d489f9 | 4945 | |
812164f8 | 4946 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4947 | if (!snapc) { |
4948 | ret = -ENOMEM; | |
4949 | goto out; | |
4950 | } | |
35d489f9 | 4951 | snapc->seq = seq; |
35d489f9 AE |
4952 | for (i = 0; i < snap_count; i++) |
4953 | snapc->snaps[i] = ceph_decode_64(&p); | |
4954 | ||
49ece554 | 4955 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4956 | rbd_dev->header.snapc = snapc; |
4957 | ||
4958 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4959 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4960 | out: |
4961 | kfree(reply_buf); | |
4962 | ||
57385b51 | 4963 | return ret; |
35d489f9 AE |
4964 | } |
4965 | ||
54cac61f AE |
4966 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4967 | u64 snap_id) | |
b8b1e2db AE |
4968 | { |
4969 | size_t size; | |
4970 | void *reply_buf; | |
54cac61f | 4971 | __le64 snapid; |
b8b1e2db AE |
4972 | int ret; |
4973 | void *p; | |
4974 | void *end; | |
b8b1e2db AE |
4975 | char *snap_name; |
4976 | ||
4977 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4978 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4979 | if (!reply_buf) | |
4980 | return ERR_PTR(-ENOMEM); | |
4981 | ||
54cac61f | 4982 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
4983 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4984 | &rbd_dev->header_oloc, "get_snapshot_name", | |
4985 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4986 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4987 | if (ret < 0) { |
4988 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4989 | goto out; |
f40eb349 | 4990 | } |
b8b1e2db AE |
4991 | |
4992 | p = reply_buf; | |
f40eb349 | 4993 | end = reply_buf + ret; |
e5c35534 | 4994 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4995 | if (IS_ERR(snap_name)) |
b8b1e2db | 4996 | goto out; |
b8b1e2db | 4997 | |
f40eb349 | 4998 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4999 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
5000 | out: |
5001 | kfree(reply_buf); | |
5002 | ||
f40eb349 | 5003 | return snap_name; |
b8b1e2db AE |
5004 | } |
5005 | ||
2df3fac7 | 5006 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 5007 | { |
2df3fac7 | 5008 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 5009 | int ret; |
117973fb | 5010 | |
1617e40c JD |
5011 | ret = rbd_dev_v2_image_size(rbd_dev); |
5012 | if (ret) | |
cfbf6377 | 5013 | return ret; |
1617e40c | 5014 | |
2df3fac7 AE |
5015 | if (first_time) { |
5016 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5017 | if (ret) | |
cfbf6377 | 5018 | return ret; |
2df3fac7 AE |
5019 | } |
5020 | ||
cc4a38bd | 5021 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5022 | if (ret && first_time) { |
5023 | kfree(rbd_dev->header.object_prefix); | |
5024 | rbd_dev->header.object_prefix = NULL; | |
5025 | } | |
117973fb AE |
5026 | |
5027 | return ret; | |
5028 | } | |
5029 | ||
a720ae09 ID |
5030 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5031 | { | |
5032 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5033 | ||
5034 | if (rbd_dev->image_format == 1) | |
5035 | return rbd_dev_v1_header_info(rbd_dev); | |
5036 | ||
5037 | return rbd_dev_v2_header_info(rbd_dev); | |
5038 | } | |
5039 | ||
e28fff26 AE |
5040 | /* |
5041 | * Skips over white space at *buf, and updates *buf to point to the | |
5042 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5043 | * the token (string of non-white space characters) found. Note |
5044 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5045 | */ |
5046 | static inline size_t next_token(const char **buf) | |
5047 | { | |
5048 | /* | |
5049 | * These are the characters that produce nonzero for | |
5050 | * isspace() in the "C" and "POSIX" locales. | |
5051 | */ | |
5052 | const char *spaces = " \f\n\r\t\v"; | |
5053 | ||
5054 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5055 | ||
5056 | return strcspn(*buf, spaces); /* Return token length */ | |
5057 | } | |
5058 | ||
ea3352f4 AE |
5059 | /* |
5060 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5061 | * enough to hold a copy of it, and copies the token into the new | |
5062 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5063 | * that a duplicate buffer is created even for a zero-length token. | |
5064 | * | |
5065 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5066 | * pointer if memory for the duplicate was not available. If | |
5067 | * the lenp argument is a non-null pointer, the length of the token | |
5068 | * (not including the '\0') is returned in *lenp. | |
5069 | * | |
5070 | * If successful, the *buf pointer will be updated to point beyond | |
5071 | * the end of the found token. | |
5072 | * | |
5073 | * Note: uses GFP_KERNEL for allocation. | |
5074 | */ | |
5075 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5076 | { | |
5077 | char *dup; | |
5078 | size_t len; | |
5079 | ||
5080 | len = next_token(buf); | |
4caf35f9 | 5081 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5082 | if (!dup) |
5083 | return NULL; | |
ea3352f4 AE |
5084 | *(dup + len) = '\0'; |
5085 | *buf += len; | |
5086 | ||
5087 | if (lenp) | |
5088 | *lenp = len; | |
5089 | ||
5090 | return dup; | |
5091 | } | |
5092 | ||
a725f65e | 5093 | /* |
859c31df AE |
5094 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5095 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5096 | * and the data written is passed here via a NUL-terminated buffer. | |
5097 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5098 | * |
859c31df AE |
5099 | * The information extracted from these options is recorded in |
5100 | * the other parameters which return dynamically-allocated | |
5101 | * structures: | |
5102 | * ceph_opts | |
5103 | * The address of a pointer that will refer to a ceph options | |
5104 | * structure. Caller must release the returned pointer using | |
5105 | * ceph_destroy_options() when it is no longer needed. | |
5106 | * rbd_opts | |
5107 | * Address of an rbd options pointer. Fully initialized by | |
5108 | * this function; caller must release with kfree(). | |
5109 | * spec | |
5110 | * Address of an rbd image specification pointer. Fully | |
5111 | * initialized by this function based on parsed options. | |
5112 | * Caller must release with rbd_spec_put(). | |
5113 | * | |
5114 | * The options passed take this form: | |
5115 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5116 | * where: | |
5117 | * <mon_addrs> | |
5118 | * A comma-separated list of one or more monitor addresses. | |
5119 | * A monitor address is an ip address, optionally followed | |
5120 | * by a port number (separated by a colon). | |
5121 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5122 | * <options> | |
5123 | * A comma-separated list of ceph and/or rbd options. | |
5124 | * <pool_name> | |
5125 | * The name of the rados pool containing the rbd image. | |
5126 | * <image_name> | |
5127 | * The name of the image in that pool to map. | |
5128 | * <snap_id> | |
5129 | * An optional snapshot id. If provided, the mapping will | |
5130 | * present data from the image at the time that snapshot was | |
5131 | * created. The image head is used if no snapshot id is | |
5132 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5133 | */ |
859c31df | 5134 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5135 | struct ceph_options **ceph_opts, |
859c31df AE |
5136 | struct rbd_options **opts, |
5137 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5138 | { |
d22f76e7 | 5139 | size_t len; |
859c31df | 5140 | char *options; |
0ddebc0c | 5141 | const char *mon_addrs; |
ecb4dc22 | 5142 | char *snap_name; |
0ddebc0c | 5143 | size_t mon_addrs_size; |
859c31df | 5144 | struct rbd_spec *spec = NULL; |
4e9afeba | 5145 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5146 | struct ceph_options *copts; |
dc79b113 | 5147 | int ret; |
e28fff26 AE |
5148 | |
5149 | /* The first four tokens are required */ | |
5150 | ||
7ef3214a | 5151 | len = next_token(&buf); |
4fb5d671 AE |
5152 | if (!len) { |
5153 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5154 | return -EINVAL; | |
5155 | } | |
0ddebc0c | 5156 | mon_addrs = buf; |
f28e565a | 5157 | mon_addrs_size = len + 1; |
7ef3214a | 5158 | buf += len; |
a725f65e | 5159 | |
dc79b113 | 5160 | ret = -EINVAL; |
f28e565a AE |
5161 | options = dup_token(&buf, NULL); |
5162 | if (!options) | |
dc79b113 | 5163 | return -ENOMEM; |
4fb5d671 AE |
5164 | if (!*options) { |
5165 | rbd_warn(NULL, "no options provided"); | |
5166 | goto out_err; | |
5167 | } | |
e28fff26 | 5168 | |
859c31df AE |
5169 | spec = rbd_spec_alloc(); |
5170 | if (!spec) | |
f28e565a | 5171 | goto out_mem; |
859c31df AE |
5172 | |
5173 | spec->pool_name = dup_token(&buf, NULL); | |
5174 | if (!spec->pool_name) | |
5175 | goto out_mem; | |
4fb5d671 AE |
5176 | if (!*spec->pool_name) { |
5177 | rbd_warn(NULL, "no pool name provided"); | |
5178 | goto out_err; | |
5179 | } | |
e28fff26 | 5180 | |
69e7a02f | 5181 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 5182 | if (!spec->image_name) |
f28e565a | 5183 | goto out_mem; |
4fb5d671 AE |
5184 | if (!*spec->image_name) { |
5185 | rbd_warn(NULL, "no image name provided"); | |
5186 | goto out_err; | |
5187 | } | |
d4b125e9 | 5188 | |
f28e565a AE |
5189 | /* |
5190 | * Snapshot name is optional; default is to use "-" | |
5191 | * (indicating the head/no snapshot). | |
5192 | */ | |
3feeb894 | 5193 | len = next_token(&buf); |
820a5f3e | 5194 | if (!len) { |
3feeb894 AE |
5195 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5196 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5197 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5198 | ret = -ENAMETOOLONG; |
f28e565a | 5199 | goto out_err; |
849b4260 | 5200 | } |
ecb4dc22 AE |
5201 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5202 | if (!snap_name) | |
f28e565a | 5203 | goto out_mem; |
ecb4dc22 AE |
5204 | *(snap_name + len) = '\0'; |
5205 | spec->snap_name = snap_name; | |
e5c35534 | 5206 | |
0ddebc0c | 5207 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5208 | |
4e9afeba AE |
5209 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
5210 | if (!rbd_opts) | |
5211 | goto out_mem; | |
5212 | ||
5213 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 5214 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
34f55d0b | 5215 | rbd_opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; |
80de1912 | 5216 | rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
e010dd0a | 5217 | rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
d9360540 | 5218 | rbd_opts->trim = RBD_TRIM_DEFAULT; |
d22f76e7 | 5219 | |
859c31df | 5220 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 5221 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 5222 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
5223 | if (IS_ERR(copts)) { |
5224 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5225 | goto out_err; |
5226 | } | |
859c31df AE |
5227 | kfree(options); |
5228 | ||
5229 | *ceph_opts = copts; | |
4e9afeba | 5230 | *opts = rbd_opts; |
859c31df | 5231 | *rbd_spec = spec; |
0ddebc0c | 5232 | |
dc79b113 | 5233 | return 0; |
f28e565a | 5234 | out_mem: |
dc79b113 | 5235 | ret = -ENOMEM; |
d22f76e7 | 5236 | out_err: |
859c31df AE |
5237 | kfree(rbd_opts); |
5238 | rbd_spec_put(spec); | |
f28e565a | 5239 | kfree(options); |
d22f76e7 | 5240 | |
dc79b113 | 5241 | return ret; |
a725f65e AE |
5242 | } |
5243 | ||
e010dd0a ID |
5244 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5245 | { | |
5246 | down_write(&rbd_dev->lock_rwsem); | |
5247 | if (__rbd_is_lock_owner(rbd_dev)) | |
5248 | rbd_unlock(rbd_dev); | |
5249 | up_write(&rbd_dev->lock_rwsem); | |
5250 | } | |
5251 | ||
5252 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5253 | { | |
2f18d466 ID |
5254 | int ret; |
5255 | ||
e010dd0a ID |
5256 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
5257 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5258 | return -EINVAL; | |
5259 | } | |
5260 | ||
5261 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5262 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 | 5263 | ret = rbd_wait_state_locked(rbd_dev, true); |
e010dd0a | 5264 | up_read(&rbd_dev->lock_rwsem); |
2f18d466 | 5265 | if (ret) { |
e010dd0a ID |
5266 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); |
5267 | return -EROFS; | |
5268 | } | |
5269 | ||
5270 | return 0; | |
5271 | } | |
5272 | ||
589d30e0 AE |
5273 | /* |
5274 | * An rbd format 2 image has a unique identifier, distinct from the | |
5275 | * name given to it by the user. Internally, that identifier is | |
5276 | * what's used to specify the names of objects related to the image. | |
5277 | * | |
5278 | * A special "rbd id" object is used to map an rbd image name to its | |
5279 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5280 | * with the supplied name. | |
5281 | * | |
5282 | * This function will record the given rbd_dev's image_id field if | |
5283 | * it can be determined, and in that case will return 0. If any | |
5284 | * errors occur a negative errno will be returned and the rbd_dev's | |
5285 | * image_id field will be unchanged (and should be NULL). | |
5286 | */ | |
5287 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5288 | { | |
5289 | int ret; | |
5290 | size_t size; | |
ecd4a68a | 5291 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5292 | void *response; |
c0fba368 | 5293 | char *image_id; |
2f82ee54 | 5294 | |
2c0d0a10 AE |
5295 | /* |
5296 | * When probing a parent image, the image id is already | |
5297 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5298 | * need to fetch the image id again in this case. We |
5299 | * do still need to set the image format though. | |
2c0d0a10 | 5300 | */ |
c0fba368 AE |
5301 | if (rbd_dev->spec->image_id) { |
5302 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5303 | ||
2c0d0a10 | 5304 | return 0; |
c0fba368 | 5305 | } |
2c0d0a10 | 5306 | |
589d30e0 AE |
5307 | /* |
5308 | * First, see if the format 2 image id file exists, and if | |
5309 | * so, get the image's persistent id from it. | |
5310 | */ | |
ecd4a68a ID |
5311 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5312 | rbd_dev->spec->image_name); | |
5313 | if (ret) | |
5314 | return ret; | |
5315 | ||
5316 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5317 | |
5318 | /* Response will be an encoded string, which includes a length */ | |
5319 | ||
5320 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5321 | response = kzalloc(size, GFP_NOIO); | |
5322 | if (!response) { | |
5323 | ret = -ENOMEM; | |
5324 | goto out; | |
5325 | } | |
5326 | ||
c0fba368 AE |
5327 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5328 | ||
ecd4a68a ID |
5329 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5330 | "get_id", NULL, 0, | |
5331 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5332 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5333 | if (ret == -ENOENT) { |
5334 | image_id = kstrdup("", GFP_KERNEL); | |
5335 | ret = image_id ? 0 : -ENOMEM; | |
5336 | if (!ret) | |
5337 | rbd_dev->image_format = 1; | |
7dd440c9 | 5338 | } else if (ret >= 0) { |
c0fba368 AE |
5339 | void *p = response; |
5340 | ||
5341 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5342 | NULL, GFP_NOIO); |
461f758a | 5343 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5344 | if (!ret) |
5345 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5346 | } |
5347 | ||
5348 | if (!ret) { | |
5349 | rbd_dev->spec->image_id = image_id; | |
5350 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5351 | } |
5352 | out: | |
5353 | kfree(response); | |
ecd4a68a | 5354 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5355 | return ret; |
5356 | } | |
5357 | ||
3abef3b3 AE |
5358 | /* |
5359 | * Undo whatever state changes are made by v1 or v2 header info | |
5360 | * call. | |
5361 | */ | |
6fd48b3b AE |
5362 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5363 | { | |
5364 | struct rbd_image_header *header; | |
5365 | ||
e69b8d41 | 5366 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5367 | |
5368 | /* Free dynamic fields from the header, then zero it out */ | |
5369 | ||
5370 | header = &rbd_dev->header; | |
812164f8 | 5371 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5372 | kfree(header->snap_sizes); |
5373 | kfree(header->snap_names); | |
5374 | kfree(header->object_prefix); | |
5375 | memset(header, 0, sizeof (*header)); | |
5376 | } | |
5377 | ||
2df3fac7 | 5378 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5379 | { |
5380 | int ret; | |
a30b71b9 | 5381 | |
1e130199 | 5382 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5383 | if (ret) |
b1b5402a AE |
5384 | goto out_err; |
5385 | ||
2df3fac7 AE |
5386 | /* |
5387 | * Get the and check features for the image. Currently the | |
5388 | * features are assumed to never change. | |
5389 | */ | |
b1b5402a | 5390 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5391 | if (ret) |
9d475de5 | 5392 | goto out_err; |
35d489f9 | 5393 | |
cc070d59 AE |
5394 | /* If the image supports fancy striping, get its parameters */ |
5395 | ||
5396 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5397 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5398 | if (ret < 0) | |
5399 | goto out_err; | |
5400 | } | |
a30b71b9 | 5401 | |
7e97332e ID |
5402 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5403 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5404 | if (ret) | |
5405 | goto out_err; | |
5406 | } | |
5407 | ||
263423f8 | 5408 | rbd_init_layout(rbd_dev); |
35152979 | 5409 | return 0; |
263423f8 | 5410 | |
9d475de5 | 5411 | out_err: |
642a2537 | 5412 | rbd_dev->header.features = 0; |
1e130199 AE |
5413 | kfree(rbd_dev->header.object_prefix); |
5414 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5415 | return ret; |
a30b71b9 AE |
5416 | } |
5417 | ||
6d69bb53 ID |
5418 | /* |
5419 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5420 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5421 | * length of the already discovered part of the parent chain. | |
5422 | */ | |
5423 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5424 | { |
2f82ee54 | 5425 | struct rbd_device *parent = NULL; |
124afba2 AE |
5426 | int ret; |
5427 | ||
5428 | if (!rbd_dev->parent_spec) | |
5429 | return 0; | |
124afba2 | 5430 | |
6d69bb53 ID |
5431 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5432 | pr_info("parent chain is too long (%d)\n", depth); | |
5433 | ret = -EINVAL; | |
5434 | goto out_err; | |
5435 | } | |
5436 | ||
1643dfa4 | 5437 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5438 | if (!parent) { |
5439 | ret = -ENOMEM; | |
124afba2 | 5440 | goto out_err; |
1f2c6651 ID |
5441 | } |
5442 | ||
5443 | /* | |
5444 | * Images related by parent/child relationships always share | |
5445 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5446 | */ | |
5447 | __rbd_get_client(rbd_dev->rbd_client); | |
5448 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5449 | |
6d69bb53 | 5450 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5451 | if (ret < 0) |
5452 | goto out_err; | |
1f2c6651 | 5453 | |
124afba2 | 5454 | rbd_dev->parent = parent; |
a2acd00e | 5455 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5456 | return 0; |
1f2c6651 | 5457 | |
124afba2 | 5458 | out_err: |
1f2c6651 | 5459 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5460 | rbd_dev_destroy(parent); |
124afba2 AE |
5461 | return ret; |
5462 | } | |
5463 | ||
5769ed0c ID |
5464 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5465 | { | |
5466 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5467 | rbd_dev_mapping_clear(rbd_dev); | |
5468 | rbd_free_disk(rbd_dev); | |
5469 | if (!single_major) | |
5470 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5471 | } | |
5472 | ||
811c6688 ID |
5473 | /* |
5474 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5475 | * upon return. | |
5476 | */ | |
200a6a8b | 5477 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5478 | { |
83a06263 | 5479 | int ret; |
d1cf5788 | 5480 | |
9b60e70b | 5481 | /* Record our major and minor device numbers. */ |
83a06263 | 5482 | |
9b60e70b ID |
5483 | if (!single_major) { |
5484 | ret = register_blkdev(0, rbd_dev->name); | |
5485 | if (ret < 0) | |
1643dfa4 | 5486 | goto err_out_unlock; |
9b60e70b ID |
5487 | |
5488 | rbd_dev->major = ret; | |
5489 | rbd_dev->minor = 0; | |
5490 | } else { | |
5491 | rbd_dev->major = rbd_major; | |
5492 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5493 | } | |
83a06263 AE |
5494 | |
5495 | /* Set up the blkdev mapping. */ | |
5496 | ||
5497 | ret = rbd_init_disk(rbd_dev); | |
5498 | if (ret) | |
5499 | goto err_out_blkdev; | |
5500 | ||
f35a4dee | 5501 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5502 | if (ret) |
5503 | goto err_out_disk; | |
bc1ecc65 | 5504 | |
f35a4dee | 5505 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5506 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5507 | |
5769ed0c | 5508 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5509 | if (ret) |
f5ee37bd | 5510 | goto err_out_mapping; |
83a06263 | 5511 | |
129b79d4 | 5512 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5513 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5514 | return 0; |
2f82ee54 | 5515 | |
f35a4dee AE |
5516 | err_out_mapping: |
5517 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5518 | err_out_disk: |
5519 | rbd_free_disk(rbd_dev); | |
5520 | err_out_blkdev: | |
9b60e70b ID |
5521 | if (!single_major) |
5522 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5523 | err_out_unlock: |
5524 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5525 | return ret; |
5526 | } | |
5527 | ||
332bb12d AE |
5528 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5529 | { | |
5530 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5531 | int ret; |
332bb12d AE |
5532 | |
5533 | /* Record the header object name for this rbd image. */ | |
5534 | ||
5535 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5536 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5537 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5538 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5539 | else |
c41d13a3 ID |
5540 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5541 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5542 | |
c41d13a3 | 5543 | return ret; |
332bb12d AE |
5544 | } |
5545 | ||
200a6a8b AE |
5546 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5547 | { | |
6fd48b3b | 5548 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
5549 | if (rbd_dev->opts) |
5550 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
5551 | rbd_dev->image_format = 0; |
5552 | kfree(rbd_dev->spec->image_id); | |
5553 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
5554 | } |
5555 | ||
a30b71b9 AE |
5556 | /* |
5557 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5558 | * device. If this image is the one being mapped (i.e., not a |
5559 | * parent), initiate a watch on its header object before using that | |
5560 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5561 | */ |
6d69bb53 | 5562 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5563 | { |
5564 | int ret; | |
5565 | ||
5566 | /* | |
3abef3b3 AE |
5567 | * Get the id from the image id object. Unless there's an |
5568 | * error, rbd_dev->spec->image_id will be filled in with | |
5569 | * a dynamically-allocated string, and rbd_dev->image_format | |
5570 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5571 | */ |
5572 | ret = rbd_dev_image_id(rbd_dev); | |
5573 | if (ret) | |
c0fba368 | 5574 | return ret; |
c0fba368 | 5575 | |
332bb12d AE |
5576 | ret = rbd_dev_header_name(rbd_dev); |
5577 | if (ret) | |
5578 | goto err_out_format; | |
5579 | ||
6d69bb53 | 5580 | if (!depth) { |
99d16943 | 5581 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5582 | if (ret) { |
5583 | if (ret == -ENOENT) | |
5584 | pr_info("image %s/%s does not exist\n", | |
5585 | rbd_dev->spec->pool_name, | |
5586 | rbd_dev->spec->image_name); | |
c41d13a3 | 5587 | goto err_out_format; |
1fe48023 | 5588 | } |
1f3ef788 | 5589 | } |
b644de2b | 5590 | |
a720ae09 | 5591 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5592 | if (ret) |
b644de2b | 5593 | goto err_out_watch; |
83a06263 | 5594 | |
04077599 ID |
5595 | /* |
5596 | * If this image is the one being mapped, we have pool name and | |
5597 | * id, image name and id, and snap name - need to fill snap id. | |
5598 | * Otherwise this is a parent image, identified by pool, image | |
5599 | * and snap ids - need to fill in names for those ids. | |
5600 | */ | |
6d69bb53 | 5601 | if (!depth) |
04077599 ID |
5602 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5603 | else | |
5604 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5605 | if (ret) { |
5606 | if (ret == -ENOENT) | |
5607 | pr_info("snap %s/%s@%s does not exist\n", | |
5608 | rbd_dev->spec->pool_name, | |
5609 | rbd_dev->spec->image_name, | |
5610 | rbd_dev->spec->snap_name); | |
33dca39f | 5611 | goto err_out_probe; |
1fe48023 | 5612 | } |
9bb81c9b | 5613 | |
e8f59b59 ID |
5614 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5615 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5616 | if (ret) | |
5617 | goto err_out_probe; | |
5618 | ||
5619 | /* | |
5620 | * Need to warn users if this image is the one being | |
5621 | * mapped and has a parent. | |
5622 | */ | |
6d69bb53 | 5623 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
5624 | rbd_warn(rbd_dev, |
5625 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5626 | } | |
5627 | ||
6d69bb53 | 5628 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5629 | if (ret) |
5630 | goto err_out_probe; | |
5631 | ||
5632 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5633 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5634 | return 0; |
e8f59b59 | 5635 | |
6fd48b3b AE |
5636 | err_out_probe: |
5637 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5638 | err_out_watch: |
6d69bb53 | 5639 | if (!depth) |
99d16943 | 5640 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5641 | err_out_format: |
5642 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5643 | kfree(rbd_dev->spec->image_id); |
5644 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5645 | return ret; |
5646 | } | |
5647 | ||
9b60e70b ID |
5648 | static ssize_t do_rbd_add(struct bus_type *bus, |
5649 | const char *buf, | |
5650 | size_t count) | |
602adf40 | 5651 | { |
cb8627c7 | 5652 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5653 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5654 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5655 | struct rbd_spec *spec = NULL; |
9d3997fd | 5656 | struct rbd_client *rbdc; |
b51c83c2 | 5657 | int rc; |
602adf40 YS |
5658 | |
5659 | if (!try_module_get(THIS_MODULE)) | |
5660 | return -ENODEV; | |
5661 | ||
602adf40 | 5662 | /* parse add command */ |
859c31df | 5663 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5664 | if (rc < 0) |
dd5ac32d | 5665 | goto out; |
78cea76e | 5666 | |
9d3997fd AE |
5667 | rbdc = rbd_get_client(ceph_opts); |
5668 | if (IS_ERR(rbdc)) { | |
5669 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5670 | goto err_out_args; |
9d3997fd | 5671 | } |
602adf40 | 5672 | |
602adf40 | 5673 | /* pick the pool */ |
dd435855 | 5674 | rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
1fe48023 ID |
5675 | if (rc < 0) { |
5676 | if (rc == -ENOENT) | |
5677 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5678 | goto err_out_client; |
1fe48023 | 5679 | } |
c0cd10db | 5680 | spec->pool_id = (u64)rc; |
859c31df | 5681 | |
d147543d | 5682 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5683 | if (!rbd_dev) { |
5684 | rc = -ENOMEM; | |
bd4ba655 | 5685 | goto err_out_client; |
b51c83c2 | 5686 | } |
c53d5893 AE |
5687 | rbdc = NULL; /* rbd_dev now owns this */ |
5688 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5689 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5690 | |
0d6d1e9c MC |
5691 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
5692 | if (!rbd_dev->config_info) { | |
5693 | rc = -ENOMEM; | |
5694 | goto err_out_rbd_dev; | |
5695 | } | |
5696 | ||
811c6688 | 5697 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5698 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
5699 | if (rc < 0) { |
5700 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 5701 | goto err_out_rbd_dev; |
0d6d1e9c | 5702 | } |
05fd6f6f | 5703 | |
7ce4eef7 | 5704 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 5705 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 5706 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 5707 | |
b536f69a | 5708 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 5709 | if (rc) |
8b679ec5 | 5710 | goto err_out_image_probe; |
3abef3b3 | 5711 | |
e010dd0a ID |
5712 | if (rbd_dev->opts->exclusive) { |
5713 | rc = rbd_add_acquire_lock(rbd_dev); | |
5714 | if (rc) | |
5715 | goto err_out_device_setup; | |
3abef3b3 AE |
5716 | } |
5717 | ||
5769ed0c ID |
5718 | /* Everything's ready. Announce the disk to the world. */ |
5719 | ||
5720 | rc = device_add(&rbd_dev->dev); | |
5721 | if (rc) | |
e010dd0a | 5722 | goto err_out_image_lock; |
5769ed0c ID |
5723 | |
5724 | add_disk(rbd_dev->disk); | |
5725 | /* see rbd_init_disk() */ | |
5726 | blk_put_queue(rbd_dev->disk->queue); | |
5727 | ||
5728 | spin_lock(&rbd_dev_list_lock); | |
5729 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5730 | spin_unlock(&rbd_dev_list_lock); | |
5731 | ||
5732 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
5733 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
5734 | rbd_dev->header.features); | |
dd5ac32d ID |
5735 | rc = count; |
5736 | out: | |
5737 | module_put(THIS_MODULE); | |
5738 | return rc; | |
b536f69a | 5739 | |
e010dd0a ID |
5740 | err_out_image_lock: |
5741 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
5742 | err_out_device_setup: |
5743 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
5744 | err_out_image_probe: |
5745 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
5746 | err_out_rbd_dev: |
5747 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5748 | err_out_client: |
9d3997fd | 5749 | rbd_put_client(rbdc); |
0ddebc0c | 5750 | err_out_args: |
859c31df | 5751 | rbd_spec_put(spec); |
d147543d | 5752 | kfree(rbd_opts); |
dd5ac32d | 5753 | goto out; |
602adf40 YS |
5754 | } |
5755 | ||
9b60e70b ID |
5756 | static ssize_t rbd_add(struct bus_type *bus, |
5757 | const char *buf, | |
5758 | size_t count) | |
5759 | { | |
5760 | if (single_major) | |
5761 | return -EINVAL; | |
5762 | ||
5763 | return do_rbd_add(bus, buf, count); | |
5764 | } | |
5765 | ||
5766 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5767 | const char *buf, | |
5768 | size_t count) | |
5769 | { | |
5770 | return do_rbd_add(bus, buf, count); | |
5771 | } | |
5772 | ||
05a46afd AE |
5773 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5774 | { | |
ad945fc1 | 5775 | while (rbd_dev->parent) { |
05a46afd AE |
5776 | struct rbd_device *first = rbd_dev; |
5777 | struct rbd_device *second = first->parent; | |
5778 | struct rbd_device *third; | |
5779 | ||
5780 | /* | |
5781 | * Follow to the parent with no grandparent and | |
5782 | * remove it. | |
5783 | */ | |
5784 | while (second && (third = second->parent)) { | |
5785 | first = second; | |
5786 | second = third; | |
5787 | } | |
ad945fc1 | 5788 | rbd_assert(second); |
8ad42cd0 | 5789 | rbd_dev_image_release(second); |
8b679ec5 | 5790 | rbd_dev_destroy(second); |
ad945fc1 AE |
5791 | first->parent = NULL; |
5792 | first->parent_overlap = 0; | |
5793 | ||
5794 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5795 | rbd_spec_put(first->parent_spec); |
5796 | first->parent_spec = NULL; | |
05a46afd AE |
5797 | } |
5798 | } | |
5799 | ||
9b60e70b ID |
5800 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5801 | const char *buf, | |
5802 | size_t count) | |
602adf40 YS |
5803 | { |
5804 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5805 | struct list_head *tmp; |
5806 | int dev_id; | |
0276dca6 | 5807 | char opt_buf[6]; |
82a442d2 | 5808 | bool already = false; |
0276dca6 | 5809 | bool force = false; |
0d8189e1 | 5810 | int ret; |
602adf40 | 5811 | |
0276dca6 MC |
5812 | dev_id = -1; |
5813 | opt_buf[0] = '\0'; | |
5814 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
5815 | if (dev_id < 0) { | |
5816 | pr_err("dev_id out of range\n"); | |
602adf40 | 5817 | return -EINVAL; |
0276dca6 MC |
5818 | } |
5819 | if (opt_buf[0] != '\0') { | |
5820 | if (!strcmp(opt_buf, "force")) { | |
5821 | force = true; | |
5822 | } else { | |
5823 | pr_err("bad remove option at '%s'\n", opt_buf); | |
5824 | return -EINVAL; | |
5825 | } | |
5826 | } | |
602adf40 | 5827 | |
751cc0e3 AE |
5828 | ret = -ENOENT; |
5829 | spin_lock(&rbd_dev_list_lock); | |
5830 | list_for_each(tmp, &rbd_dev_list) { | |
5831 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5832 | if (rbd_dev->dev_id == dev_id) { | |
5833 | ret = 0; | |
5834 | break; | |
5835 | } | |
42382b70 | 5836 | } |
751cc0e3 AE |
5837 | if (!ret) { |
5838 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 5839 | if (rbd_dev->open_count && !force) |
751cc0e3 AE |
5840 | ret = -EBUSY; |
5841 | else | |
82a442d2 AE |
5842 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5843 | &rbd_dev->flags); | |
751cc0e3 AE |
5844 | spin_unlock_irq(&rbd_dev->lock); |
5845 | } | |
5846 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5847 | if (ret < 0 || already) |
1ba0f1e7 | 5848 | return ret; |
751cc0e3 | 5849 | |
0276dca6 MC |
5850 | if (force) { |
5851 | /* | |
5852 | * Prevent new IO from being queued and wait for existing | |
5853 | * IO to complete/fail. | |
5854 | */ | |
5855 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
5856 | blk_set_queue_dying(rbd_dev->disk->queue); | |
5857 | } | |
5858 | ||
5769ed0c ID |
5859 | del_gendisk(rbd_dev->disk); |
5860 | spin_lock(&rbd_dev_list_lock); | |
5861 | list_del_init(&rbd_dev->node); | |
5862 | spin_unlock(&rbd_dev_list_lock); | |
5863 | device_del(&rbd_dev->dev); | |
fca27065 | 5864 | |
e010dd0a | 5865 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 5866 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 5867 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 5868 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 5869 | return count; |
602adf40 YS |
5870 | } |
5871 | ||
9b60e70b ID |
5872 | static ssize_t rbd_remove(struct bus_type *bus, |
5873 | const char *buf, | |
5874 | size_t count) | |
5875 | { | |
5876 | if (single_major) | |
5877 | return -EINVAL; | |
5878 | ||
5879 | return do_rbd_remove(bus, buf, count); | |
5880 | } | |
5881 | ||
5882 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5883 | const char *buf, | |
5884 | size_t count) | |
5885 | { | |
5886 | return do_rbd_remove(bus, buf, count); | |
5887 | } | |
5888 | ||
602adf40 YS |
5889 | /* |
5890 | * create control files in sysfs | |
dfc5606d | 5891 | * /sys/bus/rbd/... |
602adf40 YS |
5892 | */ |
5893 | static int rbd_sysfs_init(void) | |
5894 | { | |
dfc5606d | 5895 | int ret; |
602adf40 | 5896 | |
fed4c143 | 5897 | ret = device_register(&rbd_root_dev); |
21079786 | 5898 | if (ret < 0) |
dfc5606d | 5899 | return ret; |
602adf40 | 5900 | |
fed4c143 AE |
5901 | ret = bus_register(&rbd_bus_type); |
5902 | if (ret < 0) | |
5903 | device_unregister(&rbd_root_dev); | |
602adf40 | 5904 | |
602adf40 YS |
5905 | return ret; |
5906 | } | |
5907 | ||
5908 | static void rbd_sysfs_cleanup(void) | |
5909 | { | |
dfc5606d | 5910 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5911 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5912 | } |
5913 | ||
1c2a9dfe AE |
5914 | static int rbd_slab_init(void) |
5915 | { | |
5916 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 5917 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
5918 | if (!rbd_img_request_cache) |
5919 | return -ENOMEM; | |
5920 | ||
5921 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 5922 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
5923 | if (!rbd_obj_request_cache) |
5924 | goto out_err; | |
5925 | ||
6c696d85 | 5926 | return 0; |
1c2a9dfe | 5927 | |
6c696d85 | 5928 | out_err: |
868311b1 AE |
5929 | kmem_cache_destroy(rbd_img_request_cache); |
5930 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
5931 | return -ENOMEM; |
5932 | } | |
5933 | ||
5934 | static void rbd_slab_exit(void) | |
5935 | { | |
868311b1 AE |
5936 | rbd_assert(rbd_obj_request_cache); |
5937 | kmem_cache_destroy(rbd_obj_request_cache); | |
5938 | rbd_obj_request_cache = NULL; | |
5939 | ||
1c2a9dfe AE |
5940 | rbd_assert(rbd_img_request_cache); |
5941 | kmem_cache_destroy(rbd_img_request_cache); | |
5942 | rbd_img_request_cache = NULL; | |
5943 | } | |
5944 | ||
cc344fa1 | 5945 | static int __init rbd_init(void) |
602adf40 YS |
5946 | { |
5947 | int rc; | |
5948 | ||
1e32d34c AE |
5949 | if (!libceph_compatible(NULL)) { |
5950 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5951 | return -EINVAL; |
5952 | } | |
e1b4d96d | 5953 | |
1c2a9dfe | 5954 | rc = rbd_slab_init(); |
602adf40 YS |
5955 | if (rc) |
5956 | return rc; | |
e1b4d96d | 5957 | |
f5ee37bd ID |
5958 | /* |
5959 | * The number of active work items is limited by the number of | |
f77303bd | 5960 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
5961 | */ |
5962 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
5963 | if (!rbd_wq) { | |
5964 | rc = -ENOMEM; | |
5965 | goto err_out_slab; | |
5966 | } | |
5967 | ||
9b60e70b ID |
5968 | if (single_major) { |
5969 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5970 | if (rbd_major < 0) { | |
5971 | rc = rbd_major; | |
f5ee37bd | 5972 | goto err_out_wq; |
9b60e70b ID |
5973 | } |
5974 | } | |
5975 | ||
1c2a9dfe AE |
5976 | rc = rbd_sysfs_init(); |
5977 | if (rc) | |
9b60e70b ID |
5978 | goto err_out_blkdev; |
5979 | ||
5980 | if (single_major) | |
5981 | pr_info("loaded (major %d)\n", rbd_major); | |
5982 | else | |
5983 | pr_info("loaded\n"); | |
1c2a9dfe | 5984 | |
e1b4d96d ID |
5985 | return 0; |
5986 | ||
9b60e70b ID |
5987 | err_out_blkdev: |
5988 | if (single_major) | |
5989 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
5990 | err_out_wq: |
5991 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
5992 | err_out_slab: |
5993 | rbd_slab_exit(); | |
1c2a9dfe | 5994 | return rc; |
602adf40 YS |
5995 | } |
5996 | ||
cc344fa1 | 5997 | static void __exit rbd_exit(void) |
602adf40 | 5998 | { |
ffe312cf | 5999 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6000 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6001 | if (single_major) |
6002 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6003 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6004 | rbd_slab_exit(); |
602adf40 YS |
6005 | } |
6006 | ||
6007 | module_init(rbd_init); | |
6008 | module_exit(rbd_exit); | |
6009 | ||
d552c619 | 6010 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6011 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6012 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6013 | /* following authorship retained from original osdblk.c */ |
6014 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6015 | ||
90da258b | 6016 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6017 | MODULE_LICENSE("GPL"); |