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 | ||
bfc18e38 | 64 | counter = (unsigned int)atomic_fetch_add_unless(v, 1, 0); |
a2acd00e AE |
65 | if (counter <= (unsigned int)INT_MAX) |
66 | return (int)counter; | |
67 | ||
68 | atomic_dec(v); | |
69 | ||
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
74 | static int atomic_dec_return_safe(atomic_t *v) | |
75 | { | |
76 | int counter; | |
77 | ||
78 | counter = atomic_dec_return(v); | |
79 | if (counter >= 0) | |
80 | return counter; | |
81 | ||
82 | atomic_inc(v); | |
83 | ||
84 | return -EINVAL; | |
85 | } | |
86 | ||
f0f8cef5 | 87 | #define RBD_DRV_NAME "rbd" |
602adf40 | 88 | |
7e513d43 ID |
89 | #define RBD_MINORS_PER_MAJOR 256 |
90 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 91 | |
6d69bb53 ID |
92 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
93 | ||
d4b125e9 AE |
94 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
95 | #define RBD_MAX_SNAP_NAME_LEN \ | |
96 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
97 | ||
35d489f9 | 98 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
99 | |
100 | #define RBD_SNAP_HEAD_NAME "-" | |
101 | ||
9682fc6d AE |
102 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
103 | ||
9e15b77d AE |
104 | /* This allows a single page to hold an image name sent by OSD */ |
105 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 106 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 107 | |
1e130199 | 108 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 109 | |
ed95b21a | 110 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
99d16943 ID |
111 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
112 | ||
d889140c AE |
113 | /* Feature bits */ |
114 | ||
8767b293 ID |
115 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
116 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) | |
117 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) | |
118 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) | |
e573427a | 119 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
8767b293 | 120 | |
ed95b21a ID |
121 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
122 | RBD_FEATURE_STRIPINGV2 | \ | |
7e97332e | 123 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
e573427a ID |
124 | RBD_FEATURE_DATA_POOL | \ |
125 | RBD_FEATURE_OPERATIONS) | |
d889140c AE |
126 | |
127 | /* Features supported by this (client software) implementation. */ | |
128 | ||
770eba6e | 129 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 130 | |
81a89793 AE |
131 | /* |
132 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
133 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 134 | */ |
602adf40 YS |
135 | #define DEV_NAME_LEN 32 |
136 | ||
137 | /* | |
138 | * block device image metadata (in-memory version) | |
139 | */ | |
140 | struct rbd_image_header { | |
f35a4dee | 141 | /* These six fields never change for a given rbd image */ |
849b4260 | 142 | char *object_prefix; |
602adf40 | 143 | __u8 obj_order; |
f35a4dee AE |
144 | u64 stripe_unit; |
145 | u64 stripe_count; | |
7e97332e | 146 | s64 data_pool_id; |
f35a4dee | 147 | u64 features; /* Might be changeable someday? */ |
602adf40 | 148 | |
f84344f3 AE |
149 | /* The remaining fields need to be updated occasionally */ |
150 | u64 image_size; | |
151 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
152 | char *snap_names; /* format 1 only */ |
153 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
154 | }; |
155 | ||
0d7dbfce AE |
156 | /* |
157 | * An rbd image specification. | |
158 | * | |
159 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
160 | * identify an image. Each rbd_dev structure includes a pointer to |
161 | * an rbd_spec structure that encapsulates this identity. | |
162 | * | |
163 | * Each of the id's in an rbd_spec has an associated name. For a | |
164 | * user-mapped image, the names are supplied and the id's associated | |
165 | * with them are looked up. For a layered image, a parent image is | |
166 | * defined by the tuple, and the names are looked up. | |
167 | * | |
168 | * An rbd_dev structure contains a parent_spec pointer which is | |
169 | * non-null if the image it represents is a child in a layered | |
170 | * image. This pointer will refer to the rbd_spec structure used | |
171 | * by the parent rbd_dev for its own identity (i.e., the structure | |
172 | * is shared between the parent and child). | |
173 | * | |
174 | * Since these structures are populated once, during the discovery | |
175 | * phase of image construction, they are effectively immutable so | |
176 | * we make no effort to synchronize access to them. | |
177 | * | |
178 | * Note that code herein does not assume the image name is known (it | |
179 | * could be a null pointer). | |
0d7dbfce AE |
180 | */ |
181 | struct rbd_spec { | |
182 | u64 pool_id; | |
ecb4dc22 | 183 | const char *pool_name; |
b26c047b | 184 | const char *pool_ns; /* NULL if default, never "" */ |
0d7dbfce | 185 | |
ecb4dc22 AE |
186 | const char *image_id; |
187 | const char *image_name; | |
0d7dbfce AE |
188 | |
189 | u64 snap_id; | |
ecb4dc22 | 190 | const char *snap_name; |
0d7dbfce AE |
191 | |
192 | struct kref kref; | |
193 | }; | |
194 | ||
602adf40 | 195 | /* |
f0f8cef5 | 196 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
197 | */ |
198 | struct rbd_client { | |
199 | struct ceph_client *client; | |
200 | struct kref kref; | |
201 | struct list_head node; | |
202 | }; | |
203 | ||
bf0d5f50 | 204 | struct rbd_img_request; |
bf0d5f50 | 205 | |
9969ebc5 | 206 | enum obj_request_type { |
a1fbb5e7 | 207 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 208 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 209 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
afb97888 | 210 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
9969ebc5 | 211 | }; |
bf0d5f50 | 212 | |
6d2940c8 | 213 | enum obj_operation_type { |
a1fbb5e7 | 214 | OBJ_OP_READ = 1, |
6d2940c8 | 215 | OBJ_OP_WRITE, |
90e98c52 | 216 | OBJ_OP_DISCARD, |
6484cbe9 | 217 | OBJ_OP_ZEROOUT, |
6d2940c8 GZ |
218 | }; |
219 | ||
3da691bf ID |
220 | /* |
221 | * Writes go through the following state machine to deal with | |
222 | * layering: | |
223 | * | |
224 | * need copyup | |
225 | * RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP | |
226 | * | ^ | | |
227 | * v \------------------------------/ | |
228 | * done | |
229 | * ^ | |
230 | * | | |
231 | * RBD_OBJ_WRITE_FLAT | |
232 | * | |
233 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
234 | * there is a parent or not. | |
235 | */ | |
236 | enum rbd_obj_write_state { | |
237 | RBD_OBJ_WRITE_FLAT = 1, | |
238 | RBD_OBJ_WRITE_GUARD, | |
239 | RBD_OBJ_WRITE_COPYUP, | |
926f9b3f AE |
240 | }; |
241 | ||
bf0d5f50 | 242 | struct rbd_obj_request { |
43df3d35 | 243 | struct ceph_object_extent ex; |
c5b5ef6c | 244 | union { |
3da691bf ID |
245 | bool tried_parent; /* for reads */ |
246 | enum rbd_obj_write_state write_state; /* for writes */ | |
c5b5ef6c | 247 | }; |
bf0d5f50 | 248 | |
51c3509e | 249 | struct rbd_img_request *img_request; |
86bd7998 ID |
250 | struct ceph_file_extent *img_extents; |
251 | u32 num_img_extents; | |
bf0d5f50 | 252 | |
788e2df3 | 253 | union { |
5359a17d | 254 | struct ceph_bio_iter bio_pos; |
788e2df3 | 255 | struct { |
7e07efb1 ID |
256 | struct ceph_bvec_iter bvec_pos; |
257 | u32 bvec_count; | |
afb97888 | 258 | u32 bvec_idx; |
788e2df3 AE |
259 | }; |
260 | }; | |
7e07efb1 ID |
261 | struct bio_vec *copyup_bvecs; |
262 | u32 copyup_bvec_count; | |
bf0d5f50 AE |
263 | |
264 | struct ceph_osd_request *osd_req; | |
265 | ||
266 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 267 | int result; |
bf0d5f50 | 268 | |
bf0d5f50 AE |
269 | struct kref kref; |
270 | }; | |
271 | ||
0c425248 | 272 | enum img_req_flags { |
9849e986 | 273 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 274 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
275 | }; |
276 | ||
bf0d5f50 | 277 | struct rbd_img_request { |
bf0d5f50 | 278 | struct rbd_device *rbd_dev; |
9bb0248d | 279 | enum obj_operation_type op_type; |
ecc633ca | 280 | enum obj_request_type data_type; |
0c425248 | 281 | unsigned long flags; |
bf0d5f50 | 282 | union { |
9849e986 | 283 | u64 snap_id; /* for reads */ |
bf0d5f50 | 284 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
285 | }; |
286 | union { | |
287 | struct request *rq; /* block request */ | |
288 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 289 | }; |
15961b44 | 290 | spinlock_t completion_lock; |
55f27e09 | 291 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 292 | int result; /* first nonzero obj_request result */ |
bf0d5f50 | 293 | |
43df3d35 | 294 | struct list_head object_extents; /* obj_req.ex structs */ |
7114edac | 295 | u32 pending_count; |
bf0d5f50 AE |
296 | |
297 | struct kref kref; | |
298 | }; | |
299 | ||
300 | #define for_each_obj_request(ireq, oreq) \ | |
43df3d35 | 301 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 302 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
43df3d35 | 303 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 304 | |
99d16943 ID |
305 | enum rbd_watch_state { |
306 | RBD_WATCH_STATE_UNREGISTERED, | |
307 | RBD_WATCH_STATE_REGISTERED, | |
308 | RBD_WATCH_STATE_ERROR, | |
309 | }; | |
310 | ||
ed95b21a ID |
311 | enum rbd_lock_state { |
312 | RBD_LOCK_STATE_UNLOCKED, | |
313 | RBD_LOCK_STATE_LOCKED, | |
314 | RBD_LOCK_STATE_RELEASING, | |
315 | }; | |
316 | ||
317 | /* WatchNotify::ClientId */ | |
318 | struct rbd_client_id { | |
319 | u64 gid; | |
320 | u64 handle; | |
321 | }; | |
322 | ||
f84344f3 | 323 | struct rbd_mapping { |
99c1f08f | 324 | u64 size; |
34b13184 | 325 | u64 features; |
f84344f3 AE |
326 | }; |
327 | ||
602adf40 YS |
328 | /* |
329 | * a single device | |
330 | */ | |
331 | struct rbd_device { | |
de71a297 | 332 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
333 | |
334 | int major; /* blkdev assigned major */ | |
dd82fff1 | 335 | int minor; |
602adf40 | 336 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 337 | |
a30b71b9 | 338 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
339 | struct rbd_client *rbd_client; |
340 | ||
341 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
342 | ||
b82d167b | 343 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
344 | |
345 | struct rbd_image_header header; | |
b82d167b | 346 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 347 | struct rbd_spec *spec; |
d147543d | 348 | struct rbd_options *opts; |
0d6d1e9c | 349 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 350 | |
c41d13a3 | 351 | struct ceph_object_id header_oid; |
922dab61 | 352 | struct ceph_object_locator header_oloc; |
971f839a | 353 | |
1643dfa4 | 354 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 355 | |
99d16943 ID |
356 | struct mutex watch_mutex; |
357 | enum rbd_watch_state watch_state; | |
922dab61 | 358 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
359 | u64 watch_cookie; |
360 | struct delayed_work watch_dwork; | |
59c2be1e | 361 | |
ed95b21a ID |
362 | struct rw_semaphore lock_rwsem; |
363 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 364 | char lock_cookie[32]; |
ed95b21a ID |
365 | struct rbd_client_id owner_cid; |
366 | struct work_struct acquired_lock_work; | |
367 | struct work_struct released_lock_work; | |
368 | struct delayed_work lock_dwork; | |
369 | struct work_struct unlock_work; | |
370 | wait_queue_head_t lock_waitq; | |
371 | ||
1643dfa4 | 372 | struct workqueue_struct *task_wq; |
59c2be1e | 373 | |
86b00e0d AE |
374 | struct rbd_spec *parent_spec; |
375 | u64 parent_overlap; | |
a2acd00e | 376 | atomic_t parent_ref; |
2f82ee54 | 377 | struct rbd_device *parent; |
86b00e0d | 378 | |
7ad18afa CH |
379 | /* Block layer tags. */ |
380 | struct blk_mq_tag_set tag_set; | |
381 | ||
c666601a JD |
382 | /* protects updating the header */ |
383 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
384 | |
385 | struct rbd_mapping mapping; | |
602adf40 YS |
386 | |
387 | struct list_head node; | |
dfc5606d | 388 | |
dfc5606d YS |
389 | /* sysfs related */ |
390 | struct device dev; | |
b82d167b | 391 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
392 | }; |
393 | ||
b82d167b | 394 | /* |
87c0fded ID |
395 | * Flag bits for rbd_dev->flags: |
396 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
397 | * by rbd_dev->lock | |
398 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 399 | */ |
6d292906 AE |
400 | enum rbd_dev_flags { |
401 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 402 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 403 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
404 | }; |
405 | ||
cfbf6377 | 406 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 407 | |
602adf40 | 408 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
409 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
410 | ||
432b8587 AE |
411 | static LIST_HEAD(rbd_client_list); /* clients */ |
412 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 413 | |
78c2a44a AE |
414 | /* Slab caches for frequently-allocated structures */ |
415 | ||
1c2a9dfe | 416 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 417 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 418 | |
9b60e70b | 419 | static int rbd_major; |
f8a22fc2 ID |
420 | static DEFINE_IDA(rbd_dev_id_ida); |
421 | ||
f5ee37bd ID |
422 | static struct workqueue_struct *rbd_wq; |
423 | ||
9b60e70b | 424 | /* |
3cfa3b16 | 425 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 426 | */ |
3cfa3b16 | 427 | static bool single_major = true; |
5657a819 | 428 | module_param(single_major, bool, 0444); |
3cfa3b16 | 429 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 430 | |
f0f8cef5 AE |
431 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
432 | size_t count); | |
433 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
434 | size_t count); | |
9b60e70b ID |
435 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
436 | size_t count); | |
437 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
438 | size_t count); | |
6d69bb53 | 439 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
f0f8cef5 | 440 | |
9b60e70b ID |
441 | static int rbd_dev_id_to_minor(int dev_id) |
442 | { | |
7e513d43 | 443 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
444 | } |
445 | ||
446 | static int minor_to_rbd_dev_id(int minor) | |
447 | { | |
7e513d43 | 448 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
449 | } |
450 | ||
ed95b21a ID |
451 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
452 | { | |
453 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
454 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
455 | } | |
456 | ||
457 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
458 | { | |
459 | bool is_lock_owner; | |
460 | ||
461 | down_read(&rbd_dev->lock_rwsem); | |
462 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
463 | up_read(&rbd_dev->lock_rwsem); | |
464 | return is_lock_owner; | |
465 | } | |
466 | ||
8767b293 ID |
467 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
468 | { | |
469 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
470 | } | |
471 | ||
5657a819 JP |
472 | static BUS_ATTR(add, 0200, NULL, rbd_add); |
473 | static BUS_ATTR(remove, 0200, NULL, rbd_remove); | |
474 | static BUS_ATTR(add_single_major, 0200, NULL, rbd_add_single_major); | |
475 | static BUS_ATTR(remove_single_major, 0200, NULL, rbd_remove_single_major); | |
476 | static BUS_ATTR(supported_features, 0444, rbd_supported_features_show, NULL); | |
b15a21dd GKH |
477 | |
478 | static struct attribute *rbd_bus_attrs[] = { | |
479 | &bus_attr_add.attr, | |
480 | &bus_attr_remove.attr, | |
9b60e70b ID |
481 | &bus_attr_add_single_major.attr, |
482 | &bus_attr_remove_single_major.attr, | |
8767b293 | 483 | &bus_attr_supported_features.attr, |
b15a21dd | 484 | NULL, |
f0f8cef5 | 485 | }; |
92c76dc0 ID |
486 | |
487 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
488 | struct attribute *attr, int index) | |
489 | { | |
9b60e70b ID |
490 | if (!single_major && |
491 | (attr == &bus_attr_add_single_major.attr || | |
492 | attr == &bus_attr_remove_single_major.attr)) | |
493 | return 0; | |
494 | ||
92c76dc0 ID |
495 | return attr->mode; |
496 | } | |
497 | ||
498 | static const struct attribute_group rbd_bus_group = { | |
499 | .attrs = rbd_bus_attrs, | |
500 | .is_visible = rbd_bus_is_visible, | |
501 | }; | |
502 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
503 | |
504 | static struct bus_type rbd_bus_type = { | |
505 | .name = "rbd", | |
b15a21dd | 506 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
507 | }; |
508 | ||
509 | static void rbd_root_dev_release(struct device *dev) | |
510 | { | |
511 | } | |
512 | ||
513 | static struct device rbd_root_dev = { | |
514 | .init_name = "rbd", | |
515 | .release = rbd_root_dev_release, | |
516 | }; | |
517 | ||
06ecc6cb AE |
518 | static __printf(2, 3) |
519 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
520 | { | |
521 | struct va_format vaf; | |
522 | va_list args; | |
523 | ||
524 | va_start(args, fmt); | |
525 | vaf.fmt = fmt; | |
526 | vaf.va = &args; | |
527 | ||
528 | if (!rbd_dev) | |
529 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
530 | else if (rbd_dev->disk) | |
531 | printk(KERN_WARNING "%s: %s: %pV\n", | |
532 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
533 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
534 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
535 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
536 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
537 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
538 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
539 | else /* punt */ | |
540 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
541 | RBD_DRV_NAME, rbd_dev, &vaf); | |
542 | va_end(args); | |
543 | } | |
544 | ||
aafb230e AE |
545 | #ifdef RBD_DEBUG |
546 | #define rbd_assert(expr) \ | |
547 | if (unlikely(!(expr))) { \ | |
548 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
549 | "at line %d:\n\n" \ | |
550 | "\trbd_assert(%s);\n\n", \ | |
551 | __func__, __LINE__, #expr); \ | |
552 | BUG(); \ | |
553 | } | |
554 | #else /* !RBD_DEBUG */ | |
555 | # define rbd_assert(expr) ((void) 0) | |
556 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 557 | |
05a46afd | 558 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 559 | |
cc4a38bd | 560 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 561 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 562 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 563 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
564 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
565 | u64 snap_id); | |
2ad3d716 AE |
566 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
567 | u8 *order, u64 *snap_size); | |
568 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
569 | u64 *snap_features); | |
59c2be1e | 570 | |
602adf40 YS |
571 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
572 | { | |
f0f8cef5 | 573 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 574 | bool removing = false; |
602adf40 | 575 | |
a14ea269 | 576 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
577 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
578 | removing = true; | |
579 | else | |
580 | rbd_dev->open_count++; | |
a14ea269 | 581 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
582 | if (removing) |
583 | return -ENOENT; | |
584 | ||
c3e946ce | 585 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 586 | |
602adf40 YS |
587 | return 0; |
588 | } | |
589 | ||
db2a144b | 590 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
591 | { |
592 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
593 | unsigned long open_count_before; |
594 | ||
a14ea269 | 595 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 596 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 597 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 598 | rbd_assert(open_count_before > 0); |
dfc5606d | 599 | |
c3e946ce | 600 | put_device(&rbd_dev->dev); |
dfc5606d YS |
601 | } |
602 | ||
131fd9f6 GZ |
603 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
604 | { | |
1de797bb | 605 | int ro; |
131fd9f6 | 606 | |
1de797bb | 607 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
608 | return -EFAULT; |
609 | ||
1de797bb | 610 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
611 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
612 | return -EROFS; | |
613 | ||
1de797bb ID |
614 | /* Let blkdev_roset() handle it */ |
615 | return -ENOTTY; | |
131fd9f6 GZ |
616 | } |
617 | ||
618 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
619 | unsigned int cmd, unsigned long arg) | |
620 | { | |
621 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 622 | int ret; |
131fd9f6 | 623 | |
131fd9f6 GZ |
624 | switch (cmd) { |
625 | case BLKROSET: | |
626 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
627 | break; | |
628 | default: | |
629 | ret = -ENOTTY; | |
630 | } | |
631 | ||
131fd9f6 GZ |
632 | return ret; |
633 | } | |
634 | ||
635 | #ifdef CONFIG_COMPAT | |
636 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
637 | unsigned int cmd, unsigned long arg) | |
638 | { | |
639 | return rbd_ioctl(bdev, mode, cmd, arg); | |
640 | } | |
641 | #endif /* CONFIG_COMPAT */ | |
642 | ||
602adf40 YS |
643 | static const struct block_device_operations rbd_bd_ops = { |
644 | .owner = THIS_MODULE, | |
645 | .open = rbd_open, | |
dfc5606d | 646 | .release = rbd_release, |
131fd9f6 GZ |
647 | .ioctl = rbd_ioctl, |
648 | #ifdef CONFIG_COMPAT | |
649 | .compat_ioctl = rbd_compat_ioctl, | |
650 | #endif | |
602adf40 YS |
651 | }; |
652 | ||
653 | /* | |
7262cfca | 654 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 655 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 656 | */ |
f8c38929 | 657 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
658 | { |
659 | struct rbd_client *rbdc; | |
660 | int ret = -ENOMEM; | |
661 | ||
37206ee5 | 662 | dout("%s:\n", __func__); |
602adf40 YS |
663 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
664 | if (!rbdc) | |
665 | goto out_opt; | |
666 | ||
667 | kref_init(&rbdc->kref); | |
668 | INIT_LIST_HEAD(&rbdc->node); | |
669 | ||
74da4a0f | 670 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 671 | if (IS_ERR(rbdc->client)) |
08f75463 | 672 | goto out_rbdc; |
43ae4701 | 673 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
674 | |
675 | ret = ceph_open_session(rbdc->client); | |
676 | if (ret < 0) | |
08f75463 | 677 | goto out_client; |
602adf40 | 678 | |
432b8587 | 679 | spin_lock(&rbd_client_list_lock); |
602adf40 | 680 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 681 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 682 | |
37206ee5 | 683 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 684 | |
602adf40 | 685 | return rbdc; |
08f75463 | 686 | out_client: |
602adf40 | 687 | ceph_destroy_client(rbdc->client); |
08f75463 | 688 | out_rbdc: |
602adf40 YS |
689 | kfree(rbdc); |
690 | out_opt: | |
43ae4701 AE |
691 | if (ceph_opts) |
692 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
693 | dout("%s: error %d\n", __func__, ret); |
694 | ||
28f259b7 | 695 | return ERR_PTR(ret); |
602adf40 YS |
696 | } |
697 | ||
2f82ee54 AE |
698 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
699 | { | |
700 | kref_get(&rbdc->kref); | |
701 | ||
702 | return rbdc; | |
703 | } | |
704 | ||
602adf40 | 705 | /* |
1f7ba331 AE |
706 | * Find a ceph client with specific addr and configuration. If |
707 | * found, bump its reference count. | |
602adf40 | 708 | */ |
1f7ba331 | 709 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
710 | { |
711 | struct rbd_client *client_node; | |
1f7ba331 | 712 | bool found = false; |
602adf40 | 713 | |
43ae4701 | 714 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
715 | return NULL; |
716 | ||
1f7ba331 AE |
717 | spin_lock(&rbd_client_list_lock); |
718 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
719 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
720 | __rbd_get_client(client_node); |
721 | ||
1f7ba331 AE |
722 | found = true; |
723 | break; | |
724 | } | |
725 | } | |
726 | spin_unlock(&rbd_client_list_lock); | |
727 | ||
728 | return found ? client_node : NULL; | |
602adf40 YS |
729 | } |
730 | ||
59c2be1e | 731 | /* |
210c104c | 732 | * (Per device) rbd map options |
59c2be1e YS |
733 | */ |
734 | enum { | |
b5584180 | 735 | Opt_queue_depth, |
0c93e1b7 | 736 | Opt_alloc_size, |
34f55d0b | 737 | Opt_lock_timeout, |
59c2be1e YS |
738 | Opt_last_int, |
739 | /* int args above */ | |
b26c047b | 740 | Opt_pool_ns, |
59c2be1e YS |
741 | Opt_last_string, |
742 | /* string args above */ | |
cc0538b6 AE |
743 | Opt_read_only, |
744 | Opt_read_write, | |
80de1912 | 745 | Opt_lock_on_read, |
e010dd0a | 746 | Opt_exclusive, |
d9360540 | 747 | Opt_notrim, |
210c104c | 748 | Opt_err |
59c2be1e YS |
749 | }; |
750 | ||
43ae4701 | 751 | static match_table_t rbd_opts_tokens = { |
b5584180 | 752 | {Opt_queue_depth, "queue_depth=%d"}, |
0c93e1b7 | 753 | {Opt_alloc_size, "alloc_size=%d"}, |
34f55d0b | 754 | {Opt_lock_timeout, "lock_timeout=%d"}, |
59c2be1e | 755 | /* int args above */ |
b26c047b | 756 | {Opt_pool_ns, "_pool_ns=%s"}, |
59c2be1e | 757 | /* string args above */ |
be466c1c | 758 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
759 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
760 | {Opt_read_write, "read_write"}, | |
761 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 762 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 763 | {Opt_exclusive, "exclusive"}, |
d9360540 | 764 | {Opt_notrim, "notrim"}, |
210c104c | 765 | {Opt_err, NULL} |
59c2be1e YS |
766 | }; |
767 | ||
98571b5a | 768 | struct rbd_options { |
b5584180 | 769 | int queue_depth; |
0c93e1b7 | 770 | int alloc_size; |
34f55d0b | 771 | unsigned long lock_timeout; |
98571b5a | 772 | bool read_only; |
80de1912 | 773 | bool lock_on_read; |
e010dd0a | 774 | bool exclusive; |
d9360540 | 775 | bool trim; |
98571b5a AE |
776 | }; |
777 | ||
b5584180 | 778 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
0c93e1b7 | 779 | #define RBD_ALLOC_SIZE_DEFAULT (64 * 1024) |
34f55d0b | 780 | #define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */ |
98571b5a | 781 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 782 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 783 | #define RBD_EXCLUSIVE_DEFAULT false |
d9360540 | 784 | #define RBD_TRIM_DEFAULT true |
98571b5a | 785 | |
c300156b ID |
786 | struct parse_rbd_opts_ctx { |
787 | struct rbd_spec *spec; | |
788 | struct rbd_options *opts; | |
789 | }; | |
790 | ||
59c2be1e YS |
791 | static int parse_rbd_opts_token(char *c, void *private) |
792 | { | |
c300156b | 793 | struct parse_rbd_opts_ctx *pctx = private; |
59c2be1e YS |
794 | substring_t argstr[MAX_OPT_ARGS]; |
795 | int token, intval, ret; | |
796 | ||
43ae4701 | 797 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
798 | if (token < Opt_last_int) { |
799 | ret = match_int(&argstr[0], &intval); | |
800 | if (ret < 0) { | |
2f56b6ba | 801 | pr_err("bad option arg (not int) at '%s'\n", c); |
59c2be1e YS |
802 | return ret; |
803 | } | |
804 | dout("got int token %d val %d\n", token, intval); | |
805 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 806 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
807 | } else { |
808 | dout("got token %d\n", token); | |
809 | } | |
810 | ||
811 | switch (token) { | |
b5584180 ID |
812 | case Opt_queue_depth: |
813 | if (intval < 1) { | |
814 | pr_err("queue_depth out of range\n"); | |
815 | return -EINVAL; | |
816 | } | |
c300156b | 817 | pctx->opts->queue_depth = intval; |
b5584180 | 818 | break; |
0c93e1b7 ID |
819 | case Opt_alloc_size: |
820 | if (intval < 1) { | |
821 | pr_err("alloc_size out of range\n"); | |
822 | return -EINVAL; | |
823 | } | |
824 | if (!is_power_of_2(intval)) { | |
825 | pr_err("alloc_size must be a power of 2\n"); | |
826 | return -EINVAL; | |
827 | } | |
828 | pctx->opts->alloc_size = intval; | |
829 | break; | |
34f55d0b DY |
830 | case Opt_lock_timeout: |
831 | /* 0 is "wait forever" (i.e. infinite timeout) */ | |
832 | if (intval < 0 || intval > INT_MAX / 1000) { | |
833 | pr_err("lock_timeout out of range\n"); | |
834 | return -EINVAL; | |
835 | } | |
c300156b | 836 | pctx->opts->lock_timeout = msecs_to_jiffies(intval * 1000); |
34f55d0b | 837 | break; |
b26c047b ID |
838 | case Opt_pool_ns: |
839 | kfree(pctx->spec->pool_ns); | |
840 | pctx->spec->pool_ns = match_strdup(argstr); | |
841 | if (!pctx->spec->pool_ns) | |
842 | return -ENOMEM; | |
34f55d0b | 843 | break; |
cc0538b6 | 844 | case Opt_read_only: |
c300156b | 845 | pctx->opts->read_only = true; |
cc0538b6 AE |
846 | break; |
847 | case Opt_read_write: | |
c300156b | 848 | pctx->opts->read_only = false; |
cc0538b6 | 849 | break; |
80de1912 | 850 | case Opt_lock_on_read: |
c300156b | 851 | pctx->opts->lock_on_read = true; |
80de1912 | 852 | break; |
e010dd0a | 853 | case Opt_exclusive: |
c300156b | 854 | pctx->opts->exclusive = true; |
e010dd0a | 855 | break; |
d9360540 | 856 | case Opt_notrim: |
c300156b | 857 | pctx->opts->trim = false; |
d9360540 | 858 | break; |
59c2be1e | 859 | default: |
210c104c ID |
860 | /* libceph prints "bad option" msg */ |
861 | return -EINVAL; | |
59c2be1e | 862 | } |
210c104c | 863 | |
59c2be1e YS |
864 | return 0; |
865 | } | |
866 | ||
6d2940c8 GZ |
867 | static char* obj_op_name(enum obj_operation_type op_type) |
868 | { | |
869 | switch (op_type) { | |
870 | case OBJ_OP_READ: | |
871 | return "read"; | |
872 | case OBJ_OP_WRITE: | |
873 | return "write"; | |
90e98c52 GZ |
874 | case OBJ_OP_DISCARD: |
875 | return "discard"; | |
6484cbe9 ID |
876 | case OBJ_OP_ZEROOUT: |
877 | return "zeroout"; | |
6d2940c8 GZ |
878 | default: |
879 | return "???"; | |
880 | } | |
881 | } | |
882 | ||
602adf40 YS |
883 | /* |
884 | * Destroy ceph client | |
d23a4b3f | 885 | * |
432b8587 | 886 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
887 | */ |
888 | static void rbd_client_release(struct kref *kref) | |
889 | { | |
890 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
891 | ||
37206ee5 | 892 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 893 | spin_lock(&rbd_client_list_lock); |
602adf40 | 894 | list_del(&rbdc->node); |
cd9d9f5d | 895 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
896 | |
897 | ceph_destroy_client(rbdc->client); | |
898 | kfree(rbdc); | |
899 | } | |
900 | ||
901 | /* | |
902 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
903 | * it. | |
904 | */ | |
9d3997fd | 905 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 906 | { |
c53d5893 AE |
907 | if (rbdc) |
908 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
909 | } |
910 | ||
dd435855 ID |
911 | static int wait_for_latest_osdmap(struct ceph_client *client) |
912 | { | |
913 | u64 newest_epoch; | |
914 | int ret; | |
915 | ||
916 | ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch); | |
917 | if (ret) | |
918 | return ret; | |
919 | ||
920 | if (client->osdc.osdmap->epoch >= newest_epoch) | |
921 | return 0; | |
922 | ||
923 | ceph_osdc_maybe_request_map(&client->osdc); | |
924 | return ceph_monc_wait_osdmap(&client->monc, newest_epoch, | |
925 | client->options->mount_timeout); | |
926 | } | |
927 | ||
5feb0d8d ID |
928 | /* |
929 | * Get a ceph client with specific addr and configuration, if one does | |
930 | * not exist create it. Either way, ceph_opts is consumed by this | |
931 | * function. | |
932 | */ | |
933 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) | |
934 | { | |
935 | struct rbd_client *rbdc; | |
dd435855 | 936 | int ret; |
5feb0d8d ID |
937 | |
938 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); | |
939 | rbdc = rbd_client_find(ceph_opts); | |
dd435855 | 940 | if (rbdc) { |
5feb0d8d | 941 | ceph_destroy_options(ceph_opts); |
dd435855 ID |
942 | |
943 | /* | |
944 | * Using an existing client. Make sure ->pg_pools is up to | |
945 | * date before we look up the pool id in do_rbd_add(). | |
946 | */ | |
947 | ret = wait_for_latest_osdmap(rbdc->client); | |
948 | if (ret) { | |
949 | rbd_warn(NULL, "failed to get latest osdmap: %d", ret); | |
950 | rbd_put_client(rbdc); | |
951 | rbdc = ERR_PTR(ret); | |
952 | } | |
953 | } else { | |
5feb0d8d | 954 | rbdc = rbd_client_create(ceph_opts); |
dd435855 | 955 | } |
5feb0d8d ID |
956 | mutex_unlock(&client_mutex); |
957 | ||
958 | return rbdc; | |
959 | } | |
960 | ||
a30b71b9 AE |
961 | static bool rbd_image_format_valid(u32 image_format) |
962 | { | |
963 | return image_format == 1 || image_format == 2; | |
964 | } | |
965 | ||
8e94af8e AE |
966 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
967 | { | |
103a150f AE |
968 | size_t size; |
969 | u32 snap_count; | |
970 | ||
971 | /* The header has to start with the magic rbd header text */ | |
972 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
973 | return false; | |
974 | ||
db2388b6 AE |
975 | /* The bio layer requires at least sector-sized I/O */ |
976 | ||
977 | if (ondisk->options.order < SECTOR_SHIFT) | |
978 | return false; | |
979 | ||
980 | /* If we use u64 in a few spots we may be able to loosen this */ | |
981 | ||
982 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
983 | return false; | |
984 | ||
103a150f AE |
985 | /* |
986 | * The size of a snapshot header has to fit in a size_t, and | |
987 | * that limits the number of snapshots. | |
988 | */ | |
989 | snap_count = le32_to_cpu(ondisk->snap_count); | |
990 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
991 | if (snap_count > size / sizeof (__le64)) | |
992 | return false; | |
993 | ||
994 | /* | |
995 | * Not only that, but the size of the entire the snapshot | |
996 | * header must also be representable in a size_t. | |
997 | */ | |
998 | size -= snap_count * sizeof (__le64); | |
999 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
1000 | return false; | |
1001 | ||
1002 | return true; | |
8e94af8e AE |
1003 | } |
1004 | ||
5bc3fb17 ID |
1005 | /* |
1006 | * returns the size of an object in the image | |
1007 | */ | |
1008 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
1009 | { | |
1010 | return 1U << header->obj_order; | |
1011 | } | |
1012 | ||
263423f8 ID |
1013 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
1014 | { | |
1015 | if (rbd_dev->header.stripe_unit == 0 || | |
1016 | rbd_dev->header.stripe_count == 0) { | |
1017 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
1018 | rbd_dev->header.stripe_count = 1; | |
1019 | } | |
1020 | ||
1021 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
1022 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
1023 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
1024 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
1025 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
1026 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
1027 | } | |
1028 | ||
602adf40 | 1029 | /* |
bb23e37a AE |
1030 | * Fill an rbd image header with information from the given format 1 |
1031 | * on-disk header. | |
602adf40 | 1032 | */ |
662518b1 | 1033 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 1034 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 1035 | { |
662518b1 | 1036 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
1037 | bool first_time = header->object_prefix == NULL; |
1038 | struct ceph_snap_context *snapc; | |
1039 | char *object_prefix = NULL; | |
1040 | char *snap_names = NULL; | |
1041 | u64 *snap_sizes = NULL; | |
ccece235 | 1042 | u32 snap_count; |
bb23e37a | 1043 | int ret = -ENOMEM; |
621901d6 | 1044 | u32 i; |
602adf40 | 1045 | |
bb23e37a | 1046 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 1047 | |
bb23e37a | 1048 | if (first_time) { |
848d796c ID |
1049 | object_prefix = kstrndup(ondisk->object_prefix, |
1050 | sizeof(ondisk->object_prefix), | |
1051 | GFP_KERNEL); | |
bb23e37a AE |
1052 | if (!object_prefix) |
1053 | return -ENOMEM; | |
bb23e37a | 1054 | } |
00f1f36f | 1055 | |
bb23e37a | 1056 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 1057 | |
bb23e37a AE |
1058 | snap_count = le32_to_cpu(ondisk->snap_count); |
1059 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
1060 | if (!snapc) | |
1061 | goto out_err; | |
1062 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 1063 | if (snap_count) { |
bb23e37a | 1064 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
1065 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
1066 | ||
bb23e37a | 1067 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 1068 | |
bb23e37a AE |
1069 | if (snap_names_len > (u64)SIZE_MAX) |
1070 | goto out_2big; | |
1071 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1072 | if (!snap_names) | |
6a52325f AE |
1073 | goto out_err; |
1074 | ||
bb23e37a | 1075 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1076 | snap_sizes = kmalloc_array(snap_count, |
1077 | sizeof(*header->snap_sizes), | |
1078 | GFP_KERNEL); | |
bb23e37a | 1079 | if (!snap_sizes) |
6a52325f | 1080 | goto out_err; |
bb23e37a | 1081 | |
f785cc1d | 1082 | /* |
bb23e37a AE |
1083 | * Copy the names, and fill in each snapshot's id |
1084 | * and size. | |
1085 | * | |
99a41ebc | 1086 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1087 | * ondisk buffer we're working with has |
f785cc1d AE |
1088 | * snap_names_len bytes beyond the end of the |
1089 | * snapshot id array, this memcpy() is safe. | |
1090 | */ | |
bb23e37a AE |
1091 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1092 | snaps = ondisk->snaps; | |
1093 | for (i = 0; i < snap_count; i++) { | |
1094 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1095 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1096 | } | |
602adf40 | 1097 | } |
6a52325f | 1098 | |
bb23e37a | 1099 | /* We won't fail any more, fill in the header */ |
621901d6 | 1100 | |
bb23e37a AE |
1101 | if (first_time) { |
1102 | header->object_prefix = object_prefix; | |
1103 | header->obj_order = ondisk->options.order; | |
263423f8 | 1104 | rbd_init_layout(rbd_dev); |
602adf40 | 1105 | } else { |
662518b1 AE |
1106 | ceph_put_snap_context(header->snapc); |
1107 | kfree(header->snap_names); | |
1108 | kfree(header->snap_sizes); | |
602adf40 | 1109 | } |
849b4260 | 1110 | |
bb23e37a | 1111 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1112 | |
f84344f3 | 1113 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1114 | header->snapc = snapc; |
1115 | header->snap_names = snap_names; | |
1116 | header->snap_sizes = snap_sizes; | |
468521c1 | 1117 | |
602adf40 | 1118 | return 0; |
bb23e37a AE |
1119 | out_2big: |
1120 | ret = -EIO; | |
6a52325f | 1121 | out_err: |
bb23e37a AE |
1122 | kfree(snap_sizes); |
1123 | kfree(snap_names); | |
1124 | ceph_put_snap_context(snapc); | |
1125 | kfree(object_prefix); | |
ccece235 | 1126 | |
bb23e37a | 1127 | return ret; |
602adf40 YS |
1128 | } |
1129 | ||
9682fc6d AE |
1130 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1131 | { | |
1132 | const char *snap_name; | |
1133 | ||
1134 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1135 | ||
1136 | /* Skip over names until we find the one we are looking for */ | |
1137 | ||
1138 | snap_name = rbd_dev->header.snap_names; | |
1139 | while (which--) | |
1140 | snap_name += strlen(snap_name) + 1; | |
1141 | ||
1142 | return kstrdup(snap_name, GFP_KERNEL); | |
1143 | } | |
1144 | ||
30d1cff8 AE |
1145 | /* |
1146 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1147 | * Note that result is for snapshots in *descending* order. | |
1148 | */ | |
1149 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1150 | { | |
1151 | u64 snap_id1 = *(u64 *)s1; | |
1152 | u64 snap_id2 = *(u64 *)s2; | |
1153 | ||
1154 | if (snap_id1 < snap_id2) | |
1155 | return 1; | |
1156 | return snap_id1 == snap_id2 ? 0 : -1; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Search a snapshot context to see if the given snapshot id is | |
1161 | * present. | |
1162 | * | |
1163 | * Returns the position of the snapshot id in the array if it's found, | |
1164 | * or BAD_SNAP_INDEX otherwise. | |
1165 | * | |
1166 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1167 | * reverse order, highest snapshot id first. | |
1168 | */ | |
9682fc6d AE |
1169 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1170 | { | |
1171 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1172 | u64 *found; |
9682fc6d | 1173 | |
30d1cff8 AE |
1174 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1175 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1176 | |
30d1cff8 | 1177 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1178 | } |
1179 | ||
2ad3d716 AE |
1180 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1181 | u64 snap_id) | |
9e15b77d | 1182 | { |
54cac61f | 1183 | u32 which; |
da6a6b63 | 1184 | const char *snap_name; |
9e15b77d | 1185 | |
54cac61f AE |
1186 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1187 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1188 | return ERR_PTR(-ENOENT); |
54cac61f | 1189 | |
da6a6b63 JD |
1190 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1191 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1192 | } |
1193 | ||
1194 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1195 | { | |
9e15b77d AE |
1196 | if (snap_id == CEPH_NOSNAP) |
1197 | return RBD_SNAP_HEAD_NAME; | |
1198 | ||
54cac61f AE |
1199 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1200 | if (rbd_dev->image_format == 1) | |
1201 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1202 | |
54cac61f | 1203 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1204 | } |
1205 | ||
2ad3d716 AE |
1206 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1207 | u64 *snap_size) | |
602adf40 | 1208 | { |
2ad3d716 AE |
1209 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1210 | if (snap_id == CEPH_NOSNAP) { | |
1211 | *snap_size = rbd_dev->header.image_size; | |
1212 | } else if (rbd_dev->image_format == 1) { | |
1213 | u32 which; | |
602adf40 | 1214 | |
2ad3d716 AE |
1215 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1216 | if (which == BAD_SNAP_INDEX) | |
1217 | return -ENOENT; | |
e86924a8 | 1218 | |
2ad3d716 AE |
1219 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1220 | } else { | |
1221 | u64 size = 0; | |
1222 | int ret; | |
1223 | ||
1224 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1225 | if (ret) | |
1226 | return ret; | |
1227 | ||
1228 | *snap_size = size; | |
1229 | } | |
1230 | return 0; | |
602adf40 YS |
1231 | } |
1232 | ||
2ad3d716 AE |
1233 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1234 | u64 *snap_features) | |
602adf40 | 1235 | { |
2ad3d716 AE |
1236 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1237 | if (snap_id == CEPH_NOSNAP) { | |
1238 | *snap_features = rbd_dev->header.features; | |
1239 | } else if (rbd_dev->image_format == 1) { | |
1240 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1241 | } else { |
2ad3d716 AE |
1242 | u64 features = 0; |
1243 | int ret; | |
8b0241f8 | 1244 | |
2ad3d716 AE |
1245 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1246 | if (ret) | |
1247 | return ret; | |
1248 | ||
1249 | *snap_features = features; | |
1250 | } | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1255 | { | |
8f4b7d98 | 1256 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1257 | u64 size = 0; |
1258 | u64 features = 0; | |
1259 | int ret; | |
1260 | ||
2ad3d716 AE |
1261 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1262 | if (ret) | |
1263 | return ret; | |
1264 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1265 | if (ret) | |
1266 | return ret; | |
1267 | ||
1268 | rbd_dev->mapping.size = size; | |
1269 | rbd_dev->mapping.features = features; | |
1270 | ||
8b0241f8 | 1271 | return 0; |
602adf40 YS |
1272 | } |
1273 | ||
d1cf5788 AE |
1274 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1275 | { | |
1276 | rbd_dev->mapping.size = 0; | |
1277 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1278 | } |
1279 | ||
5359a17d | 1280 | static void zero_bvec(struct bio_vec *bv) |
602adf40 | 1281 | { |
602adf40 | 1282 | void *buf; |
5359a17d | 1283 | unsigned long flags; |
602adf40 | 1284 | |
5359a17d ID |
1285 | buf = bvec_kmap_irq(bv, &flags); |
1286 | memset(buf, 0, bv->bv_len); | |
1287 | flush_dcache_page(bv->bv_page); | |
1288 | bvec_kunmap_irq(buf, &flags); | |
602adf40 YS |
1289 | } |
1290 | ||
5359a17d | 1291 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) |
b9434c5b | 1292 | { |
5359a17d | 1293 | struct ceph_bio_iter it = *bio_pos; |
b9434c5b | 1294 | |
5359a17d ID |
1295 | ceph_bio_iter_advance(&it, off); |
1296 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1297 | zero_bvec(&bv); | |
1298 | })); | |
b9434c5b AE |
1299 | } |
1300 | ||
7e07efb1 | 1301 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
602adf40 | 1302 | { |
7e07efb1 | 1303 | struct ceph_bvec_iter it = *bvec_pos; |
602adf40 | 1304 | |
7e07efb1 ID |
1305 | ceph_bvec_iter_advance(&it, off); |
1306 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1307 | zero_bvec(&bv); | |
1308 | })); | |
f7760dad AE |
1309 | } |
1310 | ||
1311 | /* | |
3da691bf | 1312 | * Zero a range in @obj_req data buffer defined by a bio (list) or |
afb97888 | 1313 | * (private) bio_vec array. |
f7760dad | 1314 | * |
3da691bf | 1315 | * @off is relative to the start of the data buffer. |
926f9b3f | 1316 | */ |
3da691bf ID |
1317 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, |
1318 | u32 bytes) | |
926f9b3f | 1319 | { |
ecc633ca | 1320 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1321 | case OBJ_REQUEST_BIO: |
1322 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1323 | break; | |
1324 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1325 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf ID |
1326 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
1327 | break; | |
1328 | default: | |
1329 | rbd_assert(0); | |
6365d33a AE |
1330 | } |
1331 | } | |
1332 | ||
bf0d5f50 AE |
1333 | static void rbd_obj_request_destroy(struct kref *kref); |
1334 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1335 | { | |
1336 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1337 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1338 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1339 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1340 | } | |
1341 | ||
0f2d5be7 AE |
1342 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1343 | { | |
1344 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1345 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1346 | kref_get(&img_request->kref); |
1347 | } | |
1348 | ||
bf0d5f50 AE |
1349 | static void rbd_img_request_destroy(struct kref *kref); |
1350 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1351 | { | |
1352 | rbd_assert(img_request != NULL); | |
37206ee5 | 1353 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1354 | kref_read(&img_request->kref)); |
e93aca0a | 1355 | kref_put(&img_request->kref, rbd_img_request_destroy); |
bf0d5f50 AE |
1356 | } |
1357 | ||
1358 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1359 | struct rbd_obj_request *obj_request) | |
1360 | { | |
25dcf954 AE |
1361 | rbd_assert(obj_request->img_request == NULL); |
1362 | ||
b155e86c | 1363 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1364 | obj_request->img_request = img_request; |
7114edac | 1365 | img_request->pending_count++; |
15961b44 | 1366 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
bf0d5f50 AE |
1367 | } |
1368 | ||
1369 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1370 | struct rbd_obj_request *obj_request) | |
1371 | { | |
15961b44 | 1372 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
43df3d35 | 1373 | list_del(&obj_request->ex.oe_item); |
bf0d5f50 | 1374 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 AE |
1375 | rbd_obj_request_put(obj_request); |
1376 | } | |
1377 | ||
980917fc | 1378 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1379 | { |
980917fc ID |
1380 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1381 | ||
a90bb0c1 | 1382 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
43df3d35 ID |
1383 | obj_request, obj_request->ex.oe_objno, obj_request->ex.oe_off, |
1384 | obj_request->ex.oe_len, osd_req); | |
980917fc | 1385 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1386 | } |
1387 | ||
0c425248 AE |
1388 | /* |
1389 | * The default/initial value for all image request flags is 0. Each | |
1390 | * is conditionally set to 1 at image request initialization time | |
1391 | * and currently never change thereafter. | |
1392 | */ | |
d0b2e944 AE |
1393 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1394 | { | |
1395 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1396 | smp_mb(); | |
1397 | } | |
1398 | ||
a2acd00e AE |
1399 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1400 | { | |
1401 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1402 | smp_mb(); | |
1403 | } | |
1404 | ||
d0b2e944 AE |
1405 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1406 | { | |
1407 | smp_mb(); | |
1408 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1409 | } | |
1410 | ||
3da691bf | 1411 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
6e2a4505 | 1412 | { |
3da691bf | 1413 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
b9434c5b | 1414 | |
43df3d35 ID |
1415 | return !obj_req->ex.oe_off && |
1416 | obj_req->ex.oe_len == rbd_dev->layout.object_size; | |
6e2a4505 AE |
1417 | } |
1418 | ||
3da691bf | 1419 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1420 | { |
3da691bf | 1421 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
bf0d5f50 | 1422 | |
43df3d35 | 1423 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
3da691bf | 1424 | rbd_dev->layout.object_size; |
0dcc685e ID |
1425 | } |
1426 | ||
86bd7998 | 1427 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1428 | { |
86bd7998 ID |
1429 | return ceph_file_extents_bytes(obj_req->img_extents, |
1430 | obj_req->num_img_extents); | |
bf0d5f50 AE |
1431 | } |
1432 | ||
3da691bf | 1433 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
bf0d5f50 | 1434 | { |
9bb0248d | 1435 | switch (img_req->op_type) { |
3da691bf ID |
1436 | case OBJ_OP_READ: |
1437 | return false; | |
1438 | case OBJ_OP_WRITE: | |
1439 | case OBJ_OP_DISCARD: | |
6484cbe9 | 1440 | case OBJ_OP_ZEROOUT: |
3da691bf ID |
1441 | return true; |
1442 | default: | |
c6244b3b | 1443 | BUG(); |
3da691bf | 1444 | } |
90e98c52 GZ |
1445 | } |
1446 | ||
3da691bf | 1447 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); |
2761713d | 1448 | |
85e084fe | 1449 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1450 | { |
3da691bf | 1451 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
bf0d5f50 | 1452 | |
3da691bf ID |
1453 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1454 | osd_req->r_result, obj_req); | |
1455 | rbd_assert(osd_req == obj_req->osd_req); | |
bf0d5f50 | 1456 | |
3da691bf ID |
1457 | obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0; |
1458 | if (!obj_req->result && !rbd_img_is_write(obj_req->img_request)) | |
1459 | obj_req->xferred = osd_req->r_result; | |
1460 | else | |
1461 | /* | |
1462 | * Writes aren't allowed to return a data payload. In some | |
1463 | * guarded write cases (e.g. stat + zero on an empty object) | |
1464 | * a stat response makes it through, but we don't care. | |
1465 | */ | |
1466 | obj_req->xferred = 0; | |
bf0d5f50 | 1467 | |
3da691bf | 1468 | rbd_obj_handle_request(obj_req); |
bf0d5f50 AE |
1469 | } |
1470 | ||
9d4df01f | 1471 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1472 | { |
8c042b0d | 1473 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1474 | |
a162b308 | 1475 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
7c84883a | 1476 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1477 | } |
1478 | ||
1479 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1480 | { | |
9d4df01f | 1481 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1482 | |
a162b308 | 1483 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
fac02ddf | 1484 | ktime_get_real_ts64(&osd_req->r_mtime); |
43df3d35 | 1485 | osd_req->r_data_offset = obj_request->ex.oe_off; |
430c28c3 AE |
1486 | } |
1487 | ||
bc81207e | 1488 | static struct ceph_osd_request * |
a162b308 | 1489 | rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops) |
bc81207e | 1490 | { |
a162b308 ID |
1491 | struct rbd_img_request *img_req = obj_req->img_request; |
1492 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
bc81207e ID |
1493 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1494 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1495 | const char *name_format = rbd_dev->image_format == 1 ? |
1496 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e | 1497 | |
a162b308 ID |
1498 | req = ceph_osdc_alloc_request(osdc, |
1499 | (rbd_img_is_write(img_req) ? img_req->snapc : NULL), | |
1500 | num_ops, false, GFP_NOIO); | |
bc81207e ID |
1501 | if (!req) |
1502 | return NULL; | |
1503 | ||
bc81207e | 1504 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1505 | req->r_priv = obj_req; |
bc81207e | 1506 | |
b26c047b ID |
1507 | /* |
1508 | * Data objects may be stored in a separate pool, but always in | |
1509 | * the same namespace in that pool as the header in its pool. | |
1510 | */ | |
1511 | ceph_oloc_copy(&req->r_base_oloc, &rbd_dev->header_oloc); | |
bc81207e | 1512 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
b26c047b | 1513 | |
a90bb0c1 | 1514 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
43df3d35 | 1515 | rbd_dev->header.object_prefix, obj_req->ex.oe_objno)) |
bc81207e ID |
1516 | goto err_req; |
1517 | ||
bc81207e ID |
1518 | return req; |
1519 | ||
1520 | err_req: | |
1521 | ceph_osdc_put_request(req); | |
1522 | return NULL; | |
1523 | } | |
1524 | ||
bf0d5f50 AE |
1525 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1526 | { | |
1527 | ceph_osdc_put_request(osd_req); | |
1528 | } | |
1529 | ||
ecc633ca | 1530 | static struct rbd_obj_request *rbd_obj_request_create(void) |
bf0d5f50 AE |
1531 | { |
1532 | struct rbd_obj_request *obj_request; | |
bf0d5f50 | 1533 | |
5a60e876 | 1534 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1535 | if (!obj_request) |
f907ad55 | 1536 | return NULL; |
f907ad55 | 1537 | |
43df3d35 | 1538 | ceph_object_extent_init(&obj_request->ex); |
bf0d5f50 AE |
1539 | kref_init(&obj_request->kref); |
1540 | ||
67e2b652 | 1541 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1542 | return obj_request; |
1543 | } | |
1544 | ||
1545 | static void rbd_obj_request_destroy(struct kref *kref) | |
1546 | { | |
1547 | struct rbd_obj_request *obj_request; | |
7e07efb1 | 1548 | u32 i; |
bf0d5f50 AE |
1549 | |
1550 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1551 | ||
37206ee5 AE |
1552 | dout("%s: obj %p\n", __func__, obj_request); |
1553 | ||
bf0d5f50 AE |
1554 | if (obj_request->osd_req) |
1555 | rbd_osd_req_destroy(obj_request->osd_req); | |
1556 | ||
ecc633ca | 1557 | switch (obj_request->img_request->data_type) { |
9969ebc5 | 1558 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1559 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1560 | case OBJ_REQUEST_BVECS: |
5359a17d | 1561 | break; /* Nothing to do */ |
afb97888 ID |
1562 | case OBJ_REQUEST_OWN_BVECS: |
1563 | kfree(obj_request->bvec_pos.bvecs); | |
788e2df3 | 1564 | break; |
7e07efb1 ID |
1565 | default: |
1566 | rbd_assert(0); | |
bf0d5f50 AE |
1567 | } |
1568 | ||
86bd7998 | 1569 | kfree(obj_request->img_extents); |
7e07efb1 ID |
1570 | if (obj_request->copyup_bvecs) { |
1571 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1572 | if (obj_request->copyup_bvecs[i].bv_page) | |
1573 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1574 | } | |
1575 | kfree(obj_request->copyup_bvecs); | |
bf0d5f50 AE |
1576 | } |
1577 | ||
868311b1 | 1578 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1579 | } |
1580 | ||
fb65d228 AE |
1581 | /* It's OK to call this for a device with no parent */ |
1582 | ||
1583 | static void rbd_spec_put(struct rbd_spec *spec); | |
1584 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1585 | { | |
1586 | rbd_dev_remove_parent(rbd_dev); | |
1587 | rbd_spec_put(rbd_dev->parent_spec); | |
1588 | rbd_dev->parent_spec = NULL; | |
1589 | rbd_dev->parent_overlap = 0; | |
1590 | } | |
1591 | ||
a2acd00e AE |
1592 | /* |
1593 | * Parent image reference counting is used to determine when an | |
1594 | * image's parent fields can be safely torn down--after there are no | |
1595 | * more in-flight requests to the parent image. When the last | |
1596 | * reference is dropped, cleaning them up is safe. | |
1597 | */ | |
1598 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1599 | { | |
1600 | int counter; | |
1601 | ||
1602 | if (!rbd_dev->parent_spec) | |
1603 | return; | |
1604 | ||
1605 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1606 | if (counter > 0) | |
1607 | return; | |
1608 | ||
1609 | /* Last reference; clean up parent data structures */ | |
1610 | ||
1611 | if (!counter) | |
1612 | rbd_dev_unparent(rbd_dev); | |
1613 | else | |
9584d508 | 1614 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1615 | } |
1616 | ||
1617 | /* | |
1618 | * If an image has a non-zero parent overlap, get a reference to its | |
1619 | * parent. | |
1620 | * | |
1621 | * Returns true if the rbd device has a parent with a non-zero | |
1622 | * overlap and a reference for it was successfully taken, or | |
1623 | * false otherwise. | |
1624 | */ | |
1625 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1626 | { | |
ae43e9d0 | 1627 | int counter = 0; |
a2acd00e AE |
1628 | |
1629 | if (!rbd_dev->parent_spec) | |
1630 | return false; | |
1631 | ||
ae43e9d0 ID |
1632 | down_read(&rbd_dev->header_rwsem); |
1633 | if (rbd_dev->parent_overlap) | |
1634 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
1635 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
1636 | |
1637 | if (counter < 0) | |
9584d508 | 1638 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1639 | |
ae43e9d0 | 1640 | return counter > 0; |
a2acd00e AE |
1641 | } |
1642 | ||
bf0d5f50 AE |
1643 | /* |
1644 | * Caller is responsible for filling in the list of object requests | |
1645 | * that comprises the image request, and the Linux request pointer | |
1646 | * (if there is one). | |
1647 | */ | |
cc344fa1 AE |
1648 | static struct rbd_img_request *rbd_img_request_create( |
1649 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1650 | enum obj_operation_type op_type, |
4e752f0a | 1651 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
1652 | { |
1653 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1654 | |
a0c5895b | 1655 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
1656 | if (!img_request) |
1657 | return NULL; | |
1658 | ||
bf0d5f50 | 1659 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1660 | img_request->op_type = op_type; |
9bb0248d | 1661 | if (!rbd_img_is_write(img_request)) |
bf0d5f50 | 1662 | img_request->snap_id = rbd_dev->spec->snap_id; |
9bb0248d ID |
1663 | else |
1664 | img_request->snapc = snapc; | |
1665 | ||
a2acd00e | 1666 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 1667 | img_request_layered_set(img_request); |
a0c5895b | 1668 | |
bf0d5f50 | 1669 | spin_lock_init(&img_request->completion_lock); |
43df3d35 | 1670 | INIT_LIST_HEAD(&img_request->object_extents); |
bf0d5f50 AE |
1671 | kref_init(&img_request->kref); |
1672 | ||
dfd9875f ID |
1673 | dout("%s: rbd_dev %p %s -> img %p\n", __func__, rbd_dev, |
1674 | obj_op_name(op_type), img_request); | |
bf0d5f50 AE |
1675 | return img_request; |
1676 | } | |
1677 | ||
1678 | static void rbd_img_request_destroy(struct kref *kref) | |
1679 | { | |
1680 | struct rbd_img_request *img_request; | |
1681 | struct rbd_obj_request *obj_request; | |
1682 | struct rbd_obj_request *next_obj_request; | |
1683 | ||
1684 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1685 | ||
37206ee5 AE |
1686 | dout("%s: img %p\n", __func__, img_request); |
1687 | ||
bf0d5f50 AE |
1688 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1689 | rbd_img_obj_request_del(img_request, obj_request); | |
1690 | ||
a2acd00e AE |
1691 | if (img_request_layered_test(img_request)) { |
1692 | img_request_layered_clear(img_request); | |
1693 | rbd_dev_parent_put(img_request->rbd_dev); | |
1694 | } | |
1695 | ||
9bb0248d | 1696 | if (rbd_img_is_write(img_request)) |
812164f8 | 1697 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1698 | |
1c2a9dfe | 1699 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1700 | } |
1701 | ||
86bd7998 ID |
1702 | static void prune_extents(struct ceph_file_extent *img_extents, |
1703 | u32 *num_img_extents, u64 overlap) | |
e93f3152 | 1704 | { |
86bd7998 | 1705 | u32 cnt = *num_img_extents; |
e93f3152 | 1706 | |
86bd7998 ID |
1707 | /* drop extents completely beyond the overlap */ |
1708 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) | |
1709 | cnt--; | |
e93f3152 | 1710 | |
86bd7998 ID |
1711 | if (cnt) { |
1712 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; | |
e93f3152 | 1713 | |
86bd7998 ID |
1714 | /* trim final overlapping extent */ |
1715 | if (ex->fe_off + ex->fe_len > overlap) | |
1716 | ex->fe_len = overlap - ex->fe_off; | |
1717 | } | |
e93f3152 | 1718 | |
86bd7998 | 1719 | *num_img_extents = cnt; |
e93f3152 AE |
1720 | } |
1721 | ||
86bd7998 ID |
1722 | /* |
1723 | * Determine the byte range(s) covered by either just the object extent | |
1724 | * or the entire object in the parent image. | |
1725 | */ | |
1726 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, | |
1727 | bool entire) | |
e93f3152 | 1728 | { |
86bd7998 ID |
1729 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1730 | int ret; | |
e93f3152 | 1731 | |
86bd7998 ID |
1732 | if (!rbd_dev->parent_overlap) |
1733 | return 0; | |
e93f3152 | 1734 | |
86bd7998 ID |
1735 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, |
1736 | entire ? 0 : obj_req->ex.oe_off, | |
1737 | entire ? rbd_dev->layout.object_size : | |
1738 | obj_req->ex.oe_len, | |
1739 | &obj_req->img_extents, | |
1740 | &obj_req->num_img_extents); | |
1741 | if (ret) | |
1742 | return ret; | |
e93f3152 | 1743 | |
86bd7998 ID |
1744 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, |
1745 | rbd_dev->parent_overlap); | |
1746 | return 0; | |
e93f3152 AE |
1747 | } |
1748 | ||
3da691bf | 1749 | static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) |
1217857f | 1750 | { |
ecc633ca | 1751 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1752 | case OBJ_REQUEST_BIO: |
1753 | osd_req_op_extent_osd_data_bio(obj_req->osd_req, which, | |
1754 | &obj_req->bio_pos, | |
43df3d35 | 1755 | obj_req->ex.oe_len); |
3da691bf ID |
1756 | break; |
1757 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1758 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf | 1759 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
43df3d35 | 1760 | obj_req->ex.oe_len); |
afb97888 | 1761 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
3da691bf ID |
1762 | osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which, |
1763 | &obj_req->bvec_pos); | |
1764 | break; | |
1765 | default: | |
1766 | rbd_assert(0); | |
1217857f | 1767 | } |
3da691bf | 1768 | } |
1217857f | 1769 | |
3da691bf ID |
1770 | static int rbd_obj_setup_read(struct rbd_obj_request *obj_req) |
1771 | { | |
a162b308 | 1772 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); |
3da691bf ID |
1773 | if (!obj_req->osd_req) |
1774 | return -ENOMEM; | |
2a842aca | 1775 | |
3da691bf | 1776 | osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ, |
43df3d35 | 1777 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1778 | rbd_osd_req_setup_data(obj_req, 0); |
7ad18afa | 1779 | |
3da691bf ID |
1780 | rbd_osd_req_format_read(obj_req); |
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req, | |
1785 | unsigned int which) | |
1786 | { | |
1787 | struct page **pages; | |
8b3e1a56 | 1788 | |
3da691bf ID |
1789 | /* |
1790 | * The response data for a STAT call consists of: | |
1791 | * le64 length; | |
1792 | * struct { | |
1793 | * le32 tv_sec; | |
1794 | * le32 tv_nsec; | |
1795 | * } mtime; | |
1796 | */ | |
1797 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
1798 | if (IS_ERR(pages)) | |
1799 | return PTR_ERR(pages); | |
1800 | ||
1801 | osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0); | |
1802 | osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages, | |
1803 | 8 + sizeof(struct ceph_timespec), | |
1804 | 0, false, true); | |
1805 | return 0; | |
1217857f AE |
1806 | } |
1807 | ||
3da691bf ID |
1808 | static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req, |
1809 | unsigned int which) | |
2169238d | 1810 | { |
3da691bf ID |
1811 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1812 | u16 opcode; | |
2169238d | 1813 | |
3da691bf ID |
1814 | osd_req_op_alloc_hint_init(obj_req->osd_req, which++, |
1815 | rbd_dev->layout.object_size, | |
1816 | rbd_dev->layout.object_size); | |
2169238d | 1817 | |
3da691bf ID |
1818 | if (rbd_obj_is_entire(obj_req)) |
1819 | opcode = CEPH_OSD_OP_WRITEFULL; | |
1820 | else | |
1821 | opcode = CEPH_OSD_OP_WRITE; | |
2169238d | 1822 | |
3da691bf | 1823 | osd_req_op_extent_init(obj_req->osd_req, which, opcode, |
43df3d35 | 1824 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf | 1825 | rbd_osd_req_setup_data(obj_req, which++); |
2169238d | 1826 | |
3da691bf ID |
1827 | rbd_assert(which == obj_req->osd_req->r_num_ops); |
1828 | rbd_osd_req_format_write(obj_req); | |
1829 | } | |
2169238d | 1830 | |
3da691bf ID |
1831 | static int rbd_obj_setup_write(struct rbd_obj_request *obj_req) |
1832 | { | |
3da691bf ID |
1833 | unsigned int num_osd_ops, which = 0; |
1834 | int ret; | |
1835 | ||
86bd7998 ID |
1836 | /* reverse map the entire object onto the parent */ |
1837 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1838 | if (ret) | |
1839 | return ret; | |
1840 | ||
1841 | if (obj_req->num_img_extents) { | |
3da691bf ID |
1842 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1843 | num_osd_ops = 3; /* stat + setallochint + write/writefull */ | |
1844 | } else { | |
1845 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1846 | num_osd_ops = 2; /* setallochint + write/writefull */ | |
2169238d AE |
1847 | } |
1848 | ||
a162b308 | 1849 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1850 | if (!obj_req->osd_req) |
1851 | return -ENOMEM; | |
2169238d | 1852 | |
86bd7998 | 1853 | if (obj_req->num_img_extents) { |
3da691bf ID |
1854 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1855 | if (ret) | |
1856 | return ret; | |
1857 | } | |
1858 | ||
1859 | __rbd_obj_setup_write(obj_req, which); | |
1860 | return 0; | |
2169238d AE |
1861 | } |
1862 | ||
6484cbe9 ID |
1863 | static u16 truncate_or_zero_opcode(struct rbd_obj_request *obj_req) |
1864 | { | |
1865 | return rbd_obj_is_tail(obj_req) ? CEPH_OSD_OP_TRUNCATE : | |
1866 | CEPH_OSD_OP_ZERO; | |
1867 | } | |
1868 | ||
1869 | static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req) | |
1870 | { | |
0c93e1b7 ID |
1871 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
1872 | u64 off = obj_req->ex.oe_off; | |
1873 | u64 next_off = obj_req->ex.oe_off + obj_req->ex.oe_len; | |
6484cbe9 ID |
1874 | int ret; |
1875 | ||
0c93e1b7 ID |
1876 | /* |
1877 | * Align the range to alloc_size boundary and punt on discards | |
1878 | * that are too small to free up any space. | |
1879 | * | |
1880 | * alloc_size == object_size && is_tail() is a special case for | |
1881 | * filestore with filestore_punch_hole = false, needed to allow | |
1882 | * truncate (in addition to delete). | |
1883 | */ | |
1884 | if (rbd_dev->opts->alloc_size != rbd_dev->layout.object_size || | |
1885 | !rbd_obj_is_tail(obj_req)) { | |
1886 | off = round_up(off, rbd_dev->opts->alloc_size); | |
1887 | next_off = round_down(next_off, rbd_dev->opts->alloc_size); | |
1888 | if (off >= next_off) | |
1889 | return 1; | |
1890 | } | |
1891 | ||
6484cbe9 ID |
1892 | /* reverse map the entire object onto the parent */ |
1893 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1894 | if (ret) | |
1895 | return ret; | |
1896 | ||
1897 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); | |
1898 | if (!obj_req->osd_req) | |
1899 | return -ENOMEM; | |
1900 | ||
1901 | if (rbd_obj_is_entire(obj_req) && !obj_req->num_img_extents) { | |
1902 | osd_req_op_init(obj_req->osd_req, 0, CEPH_OSD_OP_DELETE, 0); | |
1903 | } else { | |
0c93e1b7 ID |
1904 | dout("%s %p %llu~%llu -> %llu~%llu\n", __func__, |
1905 | obj_req, obj_req->ex.oe_off, obj_req->ex.oe_len, | |
1906 | off, next_off - off); | |
6484cbe9 ID |
1907 | osd_req_op_extent_init(obj_req->osd_req, 0, |
1908 | truncate_or_zero_opcode(obj_req), | |
0c93e1b7 | 1909 | off, next_off - off, 0, 0); |
6484cbe9 ID |
1910 | } |
1911 | ||
1912 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1913 | rbd_osd_req_format_write(obj_req); | |
1914 | return 0; | |
1915 | } | |
1916 | ||
1917 | static void __rbd_obj_setup_zeroout(struct rbd_obj_request *obj_req, | |
3da691bf ID |
1918 | unsigned int which) |
1919 | { | |
3b434a2a JD |
1920 | u16 opcode; |
1921 | ||
3da691bf | 1922 | if (rbd_obj_is_entire(obj_req)) { |
86bd7998 | 1923 | if (obj_req->num_img_extents) { |
2bb1e56e ID |
1924 | osd_req_op_init(obj_req->osd_req, which++, |
1925 | CEPH_OSD_OP_CREATE, 0); | |
3b434a2a JD |
1926 | opcode = CEPH_OSD_OP_TRUNCATE; |
1927 | } else { | |
3da691bf ID |
1928 | osd_req_op_init(obj_req->osd_req, which++, |
1929 | CEPH_OSD_OP_DELETE, 0); | |
1930 | opcode = 0; | |
3b434a2a | 1931 | } |
3b434a2a | 1932 | } else { |
6484cbe9 | 1933 | opcode = truncate_or_zero_opcode(obj_req); |
3b434a2a JD |
1934 | } |
1935 | ||
3da691bf ID |
1936 | if (opcode) |
1937 | osd_req_op_extent_init(obj_req->osd_req, which++, opcode, | |
43df3d35 | 1938 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
3da691bf ID |
1939 | 0, 0); |
1940 | ||
1941 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
1942 | rbd_osd_req_format_write(obj_req); | |
3b434a2a JD |
1943 | } |
1944 | ||
6484cbe9 | 1945 | static int rbd_obj_setup_zeroout(struct rbd_obj_request *obj_req) |
bf0d5f50 | 1946 | { |
3da691bf ID |
1947 | unsigned int num_osd_ops, which = 0; |
1948 | int ret; | |
37206ee5 | 1949 | |
86bd7998 ID |
1950 | /* reverse map the entire object onto the parent */ |
1951 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1952 | if (ret) | |
1953 | return ret; | |
f1a4739f | 1954 | |
3da691bf ID |
1955 | if (rbd_obj_is_entire(obj_req)) { |
1956 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2bb1e56e ID |
1957 | if (obj_req->num_img_extents) |
1958 | num_osd_ops = 2; /* create + truncate */ | |
1959 | else | |
1960 | num_osd_ops = 1; /* delete */ | |
3da691bf | 1961 | } else { |
86bd7998 | 1962 | if (obj_req->num_img_extents) { |
3da691bf ID |
1963 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1964 | num_osd_ops = 2; /* stat + truncate/zero */ | |
1965 | } else { | |
1966 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1967 | num_osd_ops = 1; /* truncate/zero */ | |
1968 | } | |
f1a4739f AE |
1969 | } |
1970 | ||
a162b308 | 1971 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1972 | if (!obj_req->osd_req) |
1973 | return -ENOMEM; | |
bf0d5f50 | 1974 | |
86bd7998 | 1975 | if (!rbd_obj_is_entire(obj_req) && obj_req->num_img_extents) { |
3da691bf ID |
1976 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1977 | if (ret) | |
1978 | return ret; | |
1979 | } | |
3b434a2a | 1980 | |
6484cbe9 | 1981 | __rbd_obj_setup_zeroout(obj_req, which); |
3da691bf ID |
1982 | return 0; |
1983 | } | |
9d4df01f | 1984 | |
3da691bf ID |
1985 | /* |
1986 | * For each object request in @img_req, allocate an OSD request, add | |
1987 | * individual OSD ops and prepare them for submission. The number of | |
1988 | * OSD ops depends on op_type and the overlap point (if any). | |
1989 | */ | |
1990 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
1991 | { | |
0c93e1b7 | 1992 | struct rbd_obj_request *obj_req, *next_obj_req; |
3da691bf | 1993 | int ret; |
430c28c3 | 1994 | |
0c93e1b7 | 1995 | for_each_obj_request_safe(img_req, obj_req, next_obj_req) { |
9bb0248d | 1996 | switch (img_req->op_type) { |
3da691bf ID |
1997 | case OBJ_OP_READ: |
1998 | ret = rbd_obj_setup_read(obj_req); | |
1999 | break; | |
2000 | case OBJ_OP_WRITE: | |
2001 | ret = rbd_obj_setup_write(obj_req); | |
2002 | break; | |
2003 | case OBJ_OP_DISCARD: | |
2004 | ret = rbd_obj_setup_discard(obj_req); | |
2005 | break; | |
6484cbe9 ID |
2006 | case OBJ_OP_ZEROOUT: |
2007 | ret = rbd_obj_setup_zeroout(obj_req); | |
2008 | break; | |
3da691bf ID |
2009 | default: |
2010 | rbd_assert(0); | |
2011 | } | |
0c93e1b7 | 2012 | if (ret < 0) |
3da691bf | 2013 | return ret; |
0c93e1b7 ID |
2014 | if (ret > 0) { |
2015 | img_req->xferred += obj_req->ex.oe_len; | |
2016 | img_req->pending_count--; | |
2017 | rbd_img_obj_request_del(img_req, obj_req); | |
2018 | continue; | |
2019 | } | |
26f887e0 ID |
2020 | |
2021 | ret = ceph_osdc_alloc_messages(obj_req->osd_req, GFP_NOIO); | |
2022 | if (ret) | |
2023 | return ret; | |
bf0d5f50 AE |
2024 | } |
2025 | ||
2026 | return 0; | |
3da691bf | 2027 | } |
bf0d5f50 | 2028 | |
5a237819 ID |
2029 | union rbd_img_fill_iter { |
2030 | struct ceph_bio_iter bio_iter; | |
2031 | struct ceph_bvec_iter bvec_iter; | |
2032 | }; | |
bf0d5f50 | 2033 | |
5a237819 ID |
2034 | struct rbd_img_fill_ctx { |
2035 | enum obj_request_type pos_type; | |
2036 | union rbd_img_fill_iter *pos; | |
2037 | union rbd_img_fill_iter iter; | |
2038 | ceph_object_extent_fn_t set_pos_fn; | |
afb97888 ID |
2039 | ceph_object_extent_fn_t count_fn; |
2040 | ceph_object_extent_fn_t copy_fn; | |
5a237819 | 2041 | }; |
bf0d5f50 | 2042 | |
5a237819 | 2043 | static struct ceph_object_extent *alloc_object_extent(void *arg) |
0eefd470 | 2044 | { |
5a237819 ID |
2045 | struct rbd_img_request *img_req = arg; |
2046 | struct rbd_obj_request *obj_req; | |
0eefd470 | 2047 | |
5a237819 ID |
2048 | obj_req = rbd_obj_request_create(); |
2049 | if (!obj_req) | |
2050 | return NULL; | |
2761713d | 2051 | |
5a237819 ID |
2052 | rbd_img_obj_request_add(img_req, obj_req); |
2053 | return &obj_req->ex; | |
2054 | } | |
0eefd470 | 2055 | |
afb97888 ID |
2056 | /* |
2057 | * While su != os && sc == 1 is technically not fancy (it's the same | |
2058 | * layout as su == os && sc == 1), we can't use the nocopy path for it | |
2059 | * because ->set_pos_fn() should be called only once per object. | |
2060 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so | |
2061 | * treat su != os && sc == 1 as fancy. | |
2062 | */ | |
2063 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) | |
2064 | { | |
2065 | return l->stripe_unit != l->object_size; | |
2066 | } | |
0eefd470 | 2067 | |
afb97888 ID |
2068 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, |
2069 | struct ceph_file_extent *img_extents, | |
2070 | u32 num_img_extents, | |
2071 | struct rbd_img_fill_ctx *fctx) | |
2072 | { | |
2073 | u32 i; | |
2074 | int ret; | |
2075 | ||
2076 | img_req->data_type = fctx->pos_type; | |
0eefd470 AE |
2077 | |
2078 | /* | |
afb97888 ID |
2079 | * Create object requests and set each object request's starting |
2080 | * position in the provided bio (list) or bio_vec array. | |
0eefd470 | 2081 | */ |
afb97888 ID |
2082 | fctx->iter = *fctx->pos; |
2083 | for (i = 0; i < num_img_extents; i++) { | |
2084 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, | |
2085 | img_extents[i].fe_off, | |
2086 | img_extents[i].fe_len, | |
2087 | &img_req->object_extents, | |
2088 | alloc_object_extent, img_req, | |
2089 | fctx->set_pos_fn, &fctx->iter); | |
2090 | if (ret) | |
2091 | return ret; | |
2092 | } | |
0eefd470 | 2093 | |
afb97888 | 2094 | return __rbd_img_fill_request(img_req); |
0eefd470 AE |
2095 | } |
2096 | ||
5a237819 ID |
2097 | /* |
2098 | * Map a list of image extents to a list of object extents, create the | |
2099 | * corresponding object requests (normally each to a different object, | |
2100 | * but not always) and add them to @img_req. For each object request, | |
afb97888 | 2101 | * set up its data descriptor to point to the corresponding chunk(s) of |
5a237819 ID |
2102 | * @fctx->pos data buffer. |
2103 | * | |
afb97888 ID |
2104 | * Because ceph_file_to_extents() will merge adjacent object extents |
2105 | * together, each object request's data descriptor may point to multiple | |
2106 | * different chunks of @fctx->pos data buffer. | |
2107 | * | |
5a237819 ID |
2108 | * @fctx->pos data buffer is assumed to be large enough. |
2109 | */ | |
2110 | static int rbd_img_fill_request(struct rbd_img_request *img_req, | |
2111 | struct ceph_file_extent *img_extents, | |
2112 | u32 num_img_extents, | |
2113 | struct rbd_img_fill_ctx *fctx) | |
3d7efd18 | 2114 | { |
afb97888 ID |
2115 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
2116 | struct rbd_obj_request *obj_req; | |
5a237819 ID |
2117 | u32 i; |
2118 | int ret; | |
2119 | ||
afb97888 ID |
2120 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
2121 | !rbd_layout_is_fancy(&rbd_dev->layout)) | |
2122 | return rbd_img_fill_request_nocopy(img_req, img_extents, | |
2123 | num_img_extents, fctx); | |
3d7efd18 | 2124 | |
afb97888 | 2125 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; |
0eefd470 | 2126 | |
bbea1c1a | 2127 | /* |
afb97888 ID |
2128 | * Create object requests and determine ->bvec_count for each object |
2129 | * request. Note that ->bvec_count sum over all object requests may | |
2130 | * be greater than the number of bio_vecs in the provided bio (list) | |
2131 | * or bio_vec array because when mapped, those bio_vecs can straddle | |
2132 | * stripe unit boundaries. | |
bbea1c1a | 2133 | */ |
5a237819 ID |
2134 | fctx->iter = *fctx->pos; |
2135 | for (i = 0; i < num_img_extents; i++) { | |
afb97888 | 2136 | ret = ceph_file_to_extents(&rbd_dev->layout, |
5a237819 ID |
2137 | img_extents[i].fe_off, |
2138 | img_extents[i].fe_len, | |
2139 | &img_req->object_extents, | |
2140 | alloc_object_extent, img_req, | |
afb97888 ID |
2141 | fctx->count_fn, &fctx->iter); |
2142 | if (ret) | |
2143 | return ret; | |
bbea1c1a | 2144 | } |
0eefd470 | 2145 | |
afb97888 ID |
2146 | for_each_obj_request(img_req, obj_req) { |
2147 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, | |
2148 | sizeof(*obj_req->bvec_pos.bvecs), | |
2149 | GFP_NOIO); | |
2150 | if (!obj_req->bvec_pos.bvecs) | |
2151 | return -ENOMEM; | |
2152 | } | |
0eefd470 | 2153 | |
8785b1d4 | 2154 | /* |
afb97888 ID |
2155 | * Fill in each object request's private bio_vec array, splitting and |
2156 | * rearranging the provided bio_vecs in stripe unit chunks as needed. | |
8785b1d4 | 2157 | */ |
afb97888 ID |
2158 | fctx->iter = *fctx->pos; |
2159 | for (i = 0; i < num_img_extents; i++) { | |
2160 | ret = ceph_iterate_extents(&rbd_dev->layout, | |
2161 | img_extents[i].fe_off, | |
2162 | img_extents[i].fe_len, | |
2163 | &img_req->object_extents, | |
2164 | fctx->copy_fn, &fctx->iter); | |
5a237819 ID |
2165 | if (ret) |
2166 | return ret; | |
2167 | } | |
3d7efd18 | 2168 | |
5a237819 ID |
2169 | return __rbd_img_fill_request(img_req); |
2170 | } | |
2171 | ||
2172 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, | |
2173 | u64 off, u64 len) | |
2174 | { | |
2175 | struct ceph_file_extent ex = { off, len }; | |
2176 | union rbd_img_fill_iter dummy; | |
2177 | struct rbd_img_fill_ctx fctx = { | |
2178 | .pos_type = OBJ_REQUEST_NODATA, | |
2179 | .pos = &dummy, | |
2180 | }; | |
2181 | ||
2182 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); | |
2183 | } | |
2184 | ||
2185 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2186 | { | |
2187 | struct rbd_obj_request *obj_req = | |
2188 | container_of(ex, struct rbd_obj_request, ex); | |
2189 | struct ceph_bio_iter *it = arg; | |
3d7efd18 | 2190 | |
5a237819 ID |
2191 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2192 | obj_req->bio_pos = *it; | |
2193 | ceph_bio_iter_advance(it, bytes); | |
2194 | } | |
3d7efd18 | 2195 | |
afb97888 ID |
2196 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2197 | { | |
2198 | struct rbd_obj_request *obj_req = | |
2199 | container_of(ex, struct rbd_obj_request, ex); | |
2200 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2201 | |
afb97888 ID |
2202 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2203 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2204 | obj_req->bvec_count++; | |
2205 | })); | |
0eefd470 | 2206 | |
afb97888 | 2207 | } |
0eefd470 | 2208 | |
afb97888 ID |
2209 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2210 | { | |
2211 | struct rbd_obj_request *obj_req = | |
2212 | container_of(ex, struct rbd_obj_request, ex); | |
2213 | struct ceph_bio_iter *it = arg; | |
0eefd470 | 2214 | |
afb97888 ID |
2215 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); |
2216 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2217 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2218 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2219 | })); | |
3d7efd18 AE |
2220 | } |
2221 | ||
5a237819 ID |
2222 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2223 | struct ceph_file_extent *img_extents, | |
2224 | u32 num_img_extents, | |
2225 | struct ceph_bio_iter *bio_pos) | |
2226 | { | |
2227 | struct rbd_img_fill_ctx fctx = { | |
2228 | .pos_type = OBJ_REQUEST_BIO, | |
2229 | .pos = (union rbd_img_fill_iter *)bio_pos, | |
2230 | .set_pos_fn = set_bio_pos, | |
afb97888 ID |
2231 | .count_fn = count_bio_bvecs, |
2232 | .copy_fn = copy_bio_bvecs, | |
5a237819 | 2233 | }; |
3d7efd18 | 2234 | |
5a237819 ID |
2235 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2236 | &fctx); | |
2237 | } | |
3d7efd18 | 2238 | |
5a237819 ID |
2239 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2240 | u64 off, u64 len, struct bio *bio) | |
2241 | { | |
2242 | struct ceph_file_extent ex = { off, len }; | |
2243 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; | |
3d7efd18 | 2244 | |
5a237819 ID |
2245 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); |
2246 | } | |
a9e8ba2c | 2247 | |
5a237819 ID |
2248 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2249 | { | |
2250 | struct rbd_obj_request *obj_req = | |
2251 | container_of(ex, struct rbd_obj_request, ex); | |
2252 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2253 | |
5a237819 ID |
2254 | obj_req->bvec_pos = *it; |
2255 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); | |
2256 | ceph_bvec_iter_advance(it, bytes); | |
2257 | } | |
3d7efd18 | 2258 | |
afb97888 ID |
2259 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2260 | { | |
2261 | struct rbd_obj_request *obj_req = | |
2262 | container_of(ex, struct rbd_obj_request, ex); | |
2263 | struct ceph_bvec_iter *it = arg; | |
058aa991 | 2264 | |
afb97888 ID |
2265 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2266 | obj_req->bvec_count++; | |
2267 | })); | |
2268 | } | |
058aa991 | 2269 | |
afb97888 ID |
2270 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2271 | { | |
2272 | struct rbd_obj_request *obj_req = | |
2273 | container_of(ex, struct rbd_obj_request, ex); | |
2274 | struct ceph_bvec_iter *it = arg; | |
3d7efd18 | 2275 | |
afb97888 ID |
2276 | ceph_bvec_iter_advance_step(it, bytes, ({ |
2277 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2278 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2279 | })); | |
3d7efd18 AE |
2280 | } |
2281 | ||
5a237819 ID |
2282 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2283 | struct ceph_file_extent *img_extents, | |
2284 | u32 num_img_extents, | |
2285 | struct ceph_bvec_iter *bvec_pos) | |
c5b5ef6c | 2286 | { |
5a237819 ID |
2287 | struct rbd_img_fill_ctx fctx = { |
2288 | .pos_type = OBJ_REQUEST_BVECS, | |
2289 | .pos = (union rbd_img_fill_iter *)bvec_pos, | |
2290 | .set_pos_fn = set_bvec_pos, | |
afb97888 ID |
2291 | .count_fn = count_bvecs, |
2292 | .copy_fn = copy_bvecs, | |
5a237819 | 2293 | }; |
c5b5ef6c | 2294 | |
5a237819 ID |
2295 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, |
2296 | &fctx); | |
2297 | } | |
c5b5ef6c | 2298 | |
5a237819 ID |
2299 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2300 | struct ceph_file_extent *img_extents, | |
2301 | u32 num_img_extents, | |
2302 | struct bio_vec *bvecs) | |
2303 | { | |
2304 | struct ceph_bvec_iter it = { | |
2305 | .bvecs = bvecs, | |
2306 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, | |
2307 | num_img_extents) }, | |
2308 | }; | |
c5b5ef6c | 2309 | |
5a237819 ID |
2310 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, |
2311 | &it); | |
2312 | } | |
c5b5ef6c | 2313 | |
efbd1a11 | 2314 | static void rbd_img_request_submit(struct rbd_img_request *img_request) |
bf0d5f50 | 2315 | { |
bf0d5f50 | 2316 | struct rbd_obj_request *obj_request; |
c5b5ef6c | 2317 | |
37206ee5 | 2318 | dout("%s: img %p\n", __func__, img_request); |
c2e82414 | 2319 | |
663ae2cc | 2320 | rbd_img_request_get(img_request); |
efbd1a11 | 2321 | for_each_obj_request(img_request, obj_request) |
3da691bf | 2322 | rbd_obj_request_submit(obj_request); |
c2e82414 | 2323 | |
663ae2cc | 2324 | rbd_img_request_put(img_request); |
c5b5ef6c AE |
2325 | } |
2326 | ||
86bd7998 | 2327 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
c5b5ef6c | 2328 | { |
3da691bf ID |
2329 | struct rbd_img_request *img_req = obj_req->img_request; |
2330 | struct rbd_img_request *child_img_req; | |
c5b5ef6c AE |
2331 | int ret; |
2332 | ||
e93aca0a ID |
2333 | child_img_req = rbd_img_request_create(img_req->rbd_dev->parent, |
2334 | OBJ_OP_READ, NULL); | |
3da691bf | 2335 | if (!child_img_req) |
710214e3 ID |
2336 | return -ENOMEM; |
2337 | ||
e93aca0a ID |
2338 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
2339 | child_img_req->obj_request = obj_req; | |
a90bb0c1 | 2340 | |
3da691bf | 2341 | if (!rbd_img_is_write(img_req)) { |
ecc633ca | 2342 | switch (img_req->data_type) { |
3da691bf | 2343 | case OBJ_REQUEST_BIO: |
5a237819 ID |
2344 | ret = __rbd_img_fill_from_bio(child_img_req, |
2345 | obj_req->img_extents, | |
2346 | obj_req->num_img_extents, | |
2347 | &obj_req->bio_pos); | |
3da691bf ID |
2348 | break; |
2349 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2350 | case OBJ_REQUEST_OWN_BVECS: |
5a237819 ID |
2351 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
2352 | obj_req->img_extents, | |
2353 | obj_req->num_img_extents, | |
2354 | &obj_req->bvec_pos); | |
3da691bf ID |
2355 | break; |
2356 | default: | |
2357 | rbd_assert(0); | |
2358 | } | |
2359 | } else { | |
5a237819 ID |
2360 | ret = rbd_img_fill_from_bvecs(child_img_req, |
2361 | obj_req->img_extents, | |
2362 | obj_req->num_img_extents, | |
2363 | obj_req->copyup_bvecs); | |
3da691bf ID |
2364 | } |
2365 | if (ret) { | |
2366 | rbd_img_request_put(child_img_req); | |
2367 | return ret; | |
2368 | } | |
2369 | ||
2370 | rbd_img_request_submit(child_img_req); | |
2371 | return 0; | |
2372 | } | |
2373 | ||
2374 | static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req) | |
2375 | { | |
2376 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2377 | int ret; | |
2378 | ||
2379 | if (obj_req->result == -ENOENT && | |
86bd7998 ID |
2380 | rbd_dev->parent_overlap && !obj_req->tried_parent) { |
2381 | /* reverse map this object extent onto the parent */ | |
2382 | ret = rbd_obj_calc_img_extents(obj_req, false); | |
3da691bf ID |
2383 | if (ret) { |
2384 | obj_req->result = ret; | |
2385 | return true; | |
2386 | } | |
86bd7998 ID |
2387 | |
2388 | if (obj_req->num_img_extents) { | |
2389 | obj_req->tried_parent = true; | |
2390 | ret = rbd_obj_read_from_parent(obj_req); | |
2391 | if (ret) { | |
2392 | obj_req->result = ret; | |
2393 | return true; | |
2394 | } | |
2395 | return false; | |
2396 | } | |
710214e3 ID |
2397 | } |
2398 | ||
c5b5ef6c | 2399 | /* |
3da691bf ID |
2400 | * -ENOENT means a hole in the image -- zero-fill the entire |
2401 | * length of the request. A short read also implies zero-fill | |
2402 | * to the end of the request. In both cases we update xferred | |
2403 | * count to indicate the whole request was satisfied. | |
c5b5ef6c | 2404 | */ |
3da691bf | 2405 | if (obj_req->result == -ENOENT || |
43df3d35 | 2406 | (!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) { |
3da691bf ID |
2407 | rbd_assert(!obj_req->xferred || !obj_req->result); |
2408 | rbd_obj_zero_range(obj_req, obj_req->xferred, | |
43df3d35 | 2409 | obj_req->ex.oe_len - obj_req->xferred); |
3da691bf | 2410 | obj_req->result = 0; |
43df3d35 | 2411 | obj_req->xferred = obj_req->ex.oe_len; |
710214e3 | 2412 | } |
c5b5ef6c | 2413 | |
3da691bf ID |
2414 | return true; |
2415 | } | |
c5b5ef6c | 2416 | |
3da691bf ID |
2417 | /* |
2418 | * copyup_bvecs pages are never highmem pages | |
2419 | */ | |
2420 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
2421 | { | |
2422 | struct ceph_bvec_iter it = { | |
2423 | .bvecs = bvecs, | |
2424 | .iter = { .bi_size = bytes }, | |
2425 | }; | |
c5b5ef6c | 2426 | |
3da691bf ID |
2427 | ceph_bvec_iter_advance_step(&it, bytes, ({ |
2428 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
2429 | bv.bv_len)) | |
2430 | return false; | |
2431 | })); | |
2432 | return true; | |
c5b5ef6c AE |
2433 | } |
2434 | ||
3da691bf | 2435 | static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes) |
b454e36d | 2436 | { |
3da691bf | 2437 | unsigned int num_osd_ops = obj_req->osd_req->r_num_ops; |
fe943d50 | 2438 | int ret; |
70d045f6 | 2439 | |
3da691bf ID |
2440 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); |
2441 | rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT); | |
2442 | rbd_osd_req_destroy(obj_req->osd_req); | |
70d045f6 | 2443 | |
b454e36d | 2444 | /* |
3da691bf ID |
2445 | * Create a copyup request with the same number of OSD ops as |
2446 | * the original request. The original request was stat + op(s), | |
2447 | * the new copyup request will be copyup + the same op(s). | |
b454e36d | 2448 | */ |
a162b308 | 2449 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2450 | if (!obj_req->osd_req) |
2451 | return -ENOMEM; | |
b454e36d | 2452 | |
24639ce5 | 2453 | ret = osd_req_op_cls_init(obj_req->osd_req, 0, "rbd", "copyup"); |
fe943d50 CX |
2454 | if (ret) |
2455 | return ret; | |
2456 | ||
c622d226 | 2457 | /* |
3da691bf ID |
2458 | * Only send non-zero copyup data to save some I/O and network |
2459 | * bandwidth -- zero copyup data is equivalent to the object not | |
2460 | * existing. | |
c622d226 | 2461 | */ |
3da691bf ID |
2462 | if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) { |
2463 | dout("%s obj_req %p detected zeroes\n", __func__, obj_req); | |
2464 | bytes = 0; | |
2465 | } | |
3da691bf | 2466 | osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0, |
0010f705 ID |
2467 | obj_req->copyup_bvecs, |
2468 | obj_req->copyup_bvec_count, | |
2469 | bytes); | |
3da691bf | 2470 | |
9bb0248d | 2471 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2472 | case OBJ_OP_WRITE: |
2473 | __rbd_obj_setup_write(obj_req, 1); | |
2474 | break; | |
6484cbe9 | 2475 | case OBJ_OP_ZEROOUT: |
3da691bf | 2476 | rbd_assert(!rbd_obj_is_entire(obj_req)); |
6484cbe9 | 2477 | __rbd_obj_setup_zeroout(obj_req, 1); |
3da691bf ID |
2478 | break; |
2479 | default: | |
2480 | rbd_assert(0); | |
2481 | } | |
70d045f6 | 2482 | |
26f887e0 ID |
2483 | ret = ceph_osdc_alloc_messages(obj_req->osd_req, GFP_NOIO); |
2484 | if (ret) | |
2485 | return ret; | |
2486 | ||
3da691bf | 2487 | rbd_obj_request_submit(obj_req); |
3da691bf | 2488 | return 0; |
70d045f6 ID |
2489 | } |
2490 | ||
7e07efb1 | 2491 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
70d045f6 | 2492 | { |
7e07efb1 | 2493 | u32 i; |
b454e36d | 2494 | |
7e07efb1 ID |
2495 | rbd_assert(!obj_req->copyup_bvecs); |
2496 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
2497 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
2498 | sizeof(*obj_req->copyup_bvecs), | |
2499 | GFP_NOIO); | |
2500 | if (!obj_req->copyup_bvecs) | |
2501 | return -ENOMEM; | |
b454e36d | 2502 | |
7e07efb1 ID |
2503 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { |
2504 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
2505 | ||
2506 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
2507 | if (!obj_req->copyup_bvecs[i].bv_page) | |
2508 | return -ENOMEM; | |
3d7efd18 | 2509 | |
7e07efb1 ID |
2510 | obj_req->copyup_bvecs[i].bv_offset = 0; |
2511 | obj_req->copyup_bvecs[i].bv_len = len; | |
2512 | obj_overlap -= len; | |
2513 | } | |
b454e36d | 2514 | |
7e07efb1 ID |
2515 | rbd_assert(!obj_overlap); |
2516 | return 0; | |
b454e36d AE |
2517 | } |
2518 | ||
3da691bf | 2519 | static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) |
bf0d5f50 | 2520 | { |
3da691bf | 2521 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |
3da691bf | 2522 | int ret; |
bf0d5f50 | 2523 | |
86bd7998 ID |
2524 | rbd_assert(obj_req->num_img_extents); |
2525 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
2526 | rbd_dev->parent_overlap); | |
2527 | if (!obj_req->num_img_extents) { | |
3da691bf ID |
2528 | /* |
2529 | * The overlap has become 0 (most likely because the | |
2530 | * image has been flattened). Use rbd_obj_issue_copyup() | |
2531 | * to re-submit the original write request -- the copyup | |
2532 | * operation itself will be a no-op, since someone must | |
2533 | * have populated the child object while we weren't | |
2534 | * looking. Move to WRITE_FLAT state as we'll be done | |
2535 | * with the operation once the null copyup completes. | |
2536 | */ | |
2537 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2538 | return rbd_obj_issue_copyup(obj_req, 0); | |
bf0d5f50 AE |
2539 | } |
2540 | ||
86bd7998 | 2541 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
3da691bf ID |
2542 | if (ret) |
2543 | return ret; | |
2544 | ||
2545 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; | |
86bd7998 | 2546 | return rbd_obj_read_from_parent(obj_req); |
bf0d5f50 | 2547 | } |
8b3e1a56 | 2548 | |
3da691bf | 2549 | static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req) |
8b3e1a56 | 2550 | { |
3da691bf | 2551 | int ret; |
8b3e1a56 | 2552 | |
3da691bf ID |
2553 | again: |
2554 | switch (obj_req->write_state) { | |
2555 | case RBD_OBJ_WRITE_GUARD: | |
2556 | rbd_assert(!obj_req->xferred); | |
2557 | if (obj_req->result == -ENOENT) { | |
2558 | /* | |
2559 | * The target object doesn't exist. Read the data for | |
2560 | * the entire target object up to the overlap point (if | |
2561 | * any) from the parent, so we can use it for a copyup. | |
2562 | */ | |
2563 | ret = rbd_obj_handle_write_guard(obj_req); | |
2564 | if (ret) { | |
2565 | obj_req->result = ret; | |
2566 | return true; | |
2567 | } | |
2568 | return false; | |
2569 | } | |
2570 | /* fall through */ | |
2571 | case RBD_OBJ_WRITE_FLAT: | |
2572 | if (!obj_req->result) | |
2573 | /* | |
2574 | * There is no such thing as a successful short | |
2575 | * write -- indicate the whole request was satisfied. | |
2576 | */ | |
43df3d35 | 2577 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2578 | return true; |
2579 | case RBD_OBJ_WRITE_COPYUP: | |
2580 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2581 | if (obj_req->result) | |
2582 | goto again; | |
8b3e1a56 | 2583 | |
3da691bf ID |
2584 | rbd_assert(obj_req->xferred); |
2585 | ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred); | |
2586 | if (ret) { | |
2587 | obj_req->result = ret; | |
356889c4 | 2588 | obj_req->xferred = 0; |
3da691bf ID |
2589 | return true; |
2590 | } | |
2591 | return false; | |
2592 | default: | |
c6244b3b | 2593 | BUG(); |
3da691bf ID |
2594 | } |
2595 | } | |
02c74fba | 2596 | |
3da691bf ID |
2597 | /* |
2598 | * Returns true if @obj_req is completed, or false otherwise. | |
2599 | */ | |
2600 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2601 | { | |
9bb0248d | 2602 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2603 | case OBJ_OP_READ: |
2604 | return rbd_obj_handle_read(obj_req); | |
2605 | case OBJ_OP_WRITE: | |
2606 | return rbd_obj_handle_write(obj_req); | |
2607 | case OBJ_OP_DISCARD: | |
6484cbe9 | 2608 | case OBJ_OP_ZEROOUT: |
3da691bf ID |
2609 | if (rbd_obj_handle_write(obj_req)) { |
2610 | /* | |
2611 | * Hide -ENOENT from delete/truncate/zero -- discarding | |
2612 | * a non-existent object is not a problem. | |
2613 | */ | |
2614 | if (obj_req->result == -ENOENT) { | |
2615 | obj_req->result = 0; | |
43df3d35 | 2616 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2617 | } |
2618 | return true; | |
2619 | } | |
2620 | return false; | |
2621 | default: | |
c6244b3b | 2622 | BUG(); |
3da691bf ID |
2623 | } |
2624 | } | |
02c74fba | 2625 | |
7114edac ID |
2626 | static void rbd_obj_end_request(struct rbd_obj_request *obj_req) |
2627 | { | |
2628 | struct rbd_img_request *img_req = obj_req->img_request; | |
2629 | ||
2630 | rbd_assert((!obj_req->result && | |
43df3d35 | 2631 | obj_req->xferred == obj_req->ex.oe_len) || |
7114edac ID |
2632 | (obj_req->result < 0 && !obj_req->xferred)); |
2633 | if (!obj_req->result) { | |
2634 | img_req->xferred += obj_req->xferred; | |
980917fc | 2635 | return; |
02c74fba | 2636 | } |
a9e8ba2c | 2637 | |
7114edac ID |
2638 | rbd_warn(img_req->rbd_dev, |
2639 | "%s at objno %llu %llu~%llu result %d xferred %llu", | |
43df3d35 ID |
2640 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
2641 | obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result, | |
7114edac ID |
2642 | obj_req->xferred); |
2643 | if (!img_req->result) { | |
2644 | img_req->result = obj_req->result; | |
2645 | img_req->xferred = 0; | |
2646 | } | |
2647 | } | |
a9e8ba2c | 2648 | |
3da691bf ID |
2649 | static void rbd_img_end_child_request(struct rbd_img_request *img_req) |
2650 | { | |
2651 | struct rbd_obj_request *obj_req = img_req->obj_request; | |
a9e8ba2c | 2652 | |
3da691bf | 2653 | rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags)); |
86bd7998 ID |
2654 | rbd_assert((!img_req->result && |
2655 | img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) || | |
2656 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2657 | |
3da691bf ID |
2658 | obj_req->result = img_req->result; |
2659 | obj_req->xferred = img_req->xferred; | |
2660 | rbd_img_request_put(img_req); | |
8b3e1a56 AE |
2661 | } |
2662 | ||
7114edac | 2663 | static void rbd_img_end_request(struct rbd_img_request *img_req) |
8b3e1a56 | 2664 | { |
7114edac ID |
2665 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); |
2666 | rbd_assert((!img_req->result && | |
2667 | img_req->xferred == blk_rq_bytes(img_req->rq)) || | |
2668 | (img_req->result < 0 && !img_req->xferred)); | |
8b3e1a56 | 2669 | |
7114edac ID |
2670 | blk_mq_end_request(img_req->rq, |
2671 | errno_to_blk_status(img_req->result)); | |
2672 | rbd_img_request_put(img_req); | |
3da691bf | 2673 | } |
8b3e1a56 | 2674 | |
3da691bf ID |
2675 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req) |
2676 | { | |
7114edac | 2677 | struct rbd_img_request *img_req; |
8b3e1a56 | 2678 | |
7114edac | 2679 | again: |
3da691bf ID |
2680 | if (!__rbd_obj_handle_request(obj_req)) |
2681 | return; | |
8b3e1a56 | 2682 | |
7114edac ID |
2683 | img_req = obj_req->img_request; |
2684 | spin_lock(&img_req->completion_lock); | |
2685 | rbd_obj_end_request(obj_req); | |
2686 | rbd_assert(img_req->pending_count); | |
2687 | if (--img_req->pending_count) { | |
2688 | spin_unlock(&img_req->completion_lock); | |
2689 | return; | |
2690 | } | |
8b3e1a56 | 2691 | |
7114edac ID |
2692 | spin_unlock(&img_req->completion_lock); |
2693 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { | |
2694 | obj_req = img_req->obj_request; | |
2695 | rbd_img_end_child_request(img_req); | |
2696 | goto again; | |
2697 | } | |
2698 | rbd_img_end_request(img_req); | |
8b3e1a56 | 2699 | } |
bf0d5f50 | 2700 | |
ed95b21a | 2701 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 2702 | |
ed95b21a ID |
2703 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
2704 | const struct rbd_client_id *rhs) | |
2705 | { | |
2706 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
2707 | } | |
2708 | ||
2709 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
2710 | { | |
2711 | struct rbd_client_id cid; | |
2712 | ||
2713 | mutex_lock(&rbd_dev->watch_mutex); | |
2714 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
2715 | cid.handle = rbd_dev->watch_cookie; | |
2716 | mutex_unlock(&rbd_dev->watch_mutex); | |
2717 | return cid; | |
2718 | } | |
2719 | ||
2720 | /* | |
2721 | * lock_rwsem must be held for write | |
2722 | */ | |
2723 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
2724 | const struct rbd_client_id *cid) | |
2725 | { | |
2726 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
2727 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
2728 | cid->gid, cid->handle); | |
2729 | rbd_dev->owner_cid = *cid; /* struct */ | |
2730 | } | |
2731 | ||
2732 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
2733 | { | |
2734 | mutex_lock(&rbd_dev->watch_mutex); | |
2735 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
2736 | mutex_unlock(&rbd_dev->watch_mutex); | |
2737 | } | |
2738 | ||
edd8ca80 FM |
2739 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
2740 | { | |
2741 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
2742 | ||
2743 | strcpy(rbd_dev->lock_cookie, cookie); | |
2744 | rbd_set_owner_cid(rbd_dev, &cid); | |
2745 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
2746 | } | |
2747 | ||
ed95b21a ID |
2748 | /* |
2749 | * lock_rwsem must be held for write | |
2750 | */ | |
2751 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 2752 | { |
922dab61 | 2753 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 2754 | char cookie[32]; |
e627db08 | 2755 | int ret; |
b8d70035 | 2756 | |
cbbfb0ff ID |
2757 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
2758 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 2759 | |
ed95b21a ID |
2760 | format_lock_cookie(rbd_dev, cookie); |
2761 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
2762 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
2763 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 2764 | if (ret) |
ed95b21a | 2765 | return ret; |
b8d70035 | 2766 | |
ed95b21a | 2767 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 2768 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 2769 | return 0; |
b8d70035 AE |
2770 | } |
2771 | ||
ed95b21a ID |
2772 | /* |
2773 | * lock_rwsem must be held for write | |
2774 | */ | |
bbead745 | 2775 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 2776 | { |
922dab61 | 2777 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
2778 | int ret; |
2779 | ||
cbbfb0ff ID |
2780 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
2781 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 2782 | |
ed95b21a | 2783 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 2784 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
2785 | if (ret && ret != -ENOENT) |
2786 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 2787 | |
bbead745 ID |
2788 | /* treat errors as the image is unlocked */ |
2789 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 2790 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
2791 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
2792 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
2793 | } |
2794 | ||
ed95b21a ID |
2795 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2796 | enum rbd_notify_op notify_op, | |
2797 | struct page ***preply_pages, | |
2798 | size_t *preply_len) | |
9969ebc5 AE |
2799 | { |
2800 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a | 2801 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
08a79102 KS |
2802 | char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN]; |
2803 | int buf_size = sizeof(buf); | |
ed95b21a | 2804 | void *p = buf; |
9969ebc5 | 2805 | |
ed95b21a | 2806 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 2807 | |
ed95b21a ID |
2808 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
2809 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
2810 | ceph_encode_32(&p, notify_op); | |
2811 | ceph_encode_64(&p, cid.gid); | |
2812 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 2813 | |
ed95b21a ID |
2814 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
2815 | &rbd_dev->header_oloc, buf, buf_size, | |
2816 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
2817 | } |
2818 | ||
ed95b21a ID |
2819 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2820 | enum rbd_notify_op notify_op) | |
b30a01f2 | 2821 | { |
ed95b21a ID |
2822 | struct page **reply_pages; |
2823 | size_t reply_len; | |
b30a01f2 | 2824 | |
ed95b21a ID |
2825 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
2826 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2827 | } | |
b30a01f2 | 2828 | |
ed95b21a ID |
2829 | static void rbd_notify_acquired_lock(struct work_struct *work) |
2830 | { | |
2831 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
2832 | acquired_lock_work); | |
76756a51 | 2833 | |
ed95b21a | 2834 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
2835 | } |
2836 | ||
ed95b21a | 2837 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 2838 | { |
ed95b21a ID |
2839 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
2840 | released_lock_work); | |
811c6688 | 2841 | |
ed95b21a | 2842 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
2843 | } |
2844 | ||
ed95b21a | 2845 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 2846 | { |
ed95b21a ID |
2847 | struct page **reply_pages; |
2848 | size_t reply_len; | |
2849 | bool lock_owner_responded = false; | |
36be9a76 AE |
2850 | int ret; |
2851 | ||
ed95b21a | 2852 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 2853 | |
ed95b21a ID |
2854 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
2855 | &reply_pages, &reply_len); | |
2856 | if (ret && ret != -ETIMEDOUT) { | |
2857 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 2858 | goto out; |
ed95b21a | 2859 | } |
36be9a76 | 2860 | |
ed95b21a ID |
2861 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
2862 | void *p = page_address(reply_pages[0]); | |
2863 | void *const end = p + reply_len; | |
2864 | u32 n; | |
36be9a76 | 2865 | |
ed95b21a ID |
2866 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
2867 | while (n--) { | |
2868 | u8 struct_v; | |
2869 | u32 len; | |
36be9a76 | 2870 | |
ed95b21a ID |
2871 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
2872 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 2873 | |
ed95b21a ID |
2874 | ceph_decode_32_safe(&p, end, len, e_inval); |
2875 | if (!len) | |
2876 | continue; | |
2877 | ||
2878 | if (lock_owner_responded) { | |
2879 | rbd_warn(rbd_dev, | |
2880 | "duplicate lock owners detected"); | |
2881 | ret = -EIO; | |
2882 | goto out; | |
2883 | } | |
2884 | ||
2885 | lock_owner_responded = true; | |
2886 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
2887 | &struct_v, &len); | |
2888 | if (ret) { | |
2889 | rbd_warn(rbd_dev, | |
2890 | "failed to decode ResponseMessage: %d", | |
2891 | ret); | |
2892 | goto e_inval; | |
2893 | } | |
2894 | ||
2895 | ret = ceph_decode_32(&p); | |
2896 | } | |
2897 | } | |
2898 | ||
2899 | if (!lock_owner_responded) { | |
2900 | rbd_warn(rbd_dev, "no lock owners detected"); | |
2901 | ret = -ETIMEDOUT; | |
2902 | } | |
2903 | ||
2904 | out: | |
2905 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2906 | return ret; | |
2907 | ||
2908 | e_inval: | |
2909 | ret = -EINVAL; | |
2910 | goto out; | |
2911 | } | |
2912 | ||
2913 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
2914 | { | |
2915 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
2916 | ||
2917 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
2918 | if (wake_all) | |
2919 | wake_up_all(&rbd_dev->lock_waitq); | |
2920 | else | |
2921 | wake_up(&rbd_dev->lock_waitq); | |
2922 | } | |
2923 | ||
2924 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
2925 | struct ceph_locker **lockers, u32 *num_lockers) | |
2926 | { | |
2927 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2928 | u8 lock_type; | |
2929 | char *lock_tag; | |
2930 | int ret; | |
2931 | ||
2932 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2933 | ||
2934 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
2935 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2936 | &lock_type, &lock_tag, lockers, num_lockers); | |
2937 | if (ret) | |
2938 | return ret; | |
2939 | ||
2940 | if (*num_lockers == 0) { | |
2941 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
2942 | goto out; | |
2943 | } | |
2944 | ||
2945 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
2946 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
2947 | lock_tag); | |
2948 | ret = -EBUSY; | |
2949 | goto out; | |
2950 | } | |
2951 | ||
2952 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
2953 | rbd_warn(rbd_dev, "shared lock type detected"); | |
2954 | ret = -EBUSY; | |
2955 | goto out; | |
2956 | } | |
2957 | ||
2958 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
2959 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
2960 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
2961 | (*lockers)[0].id.cookie); | |
2962 | ret = -EBUSY; | |
2963 | goto out; | |
2964 | } | |
2965 | ||
2966 | out: | |
2967 | kfree(lock_tag); | |
2968 | return ret; | |
2969 | } | |
2970 | ||
2971 | static int find_watcher(struct rbd_device *rbd_dev, | |
2972 | const struct ceph_locker *locker) | |
2973 | { | |
2974 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2975 | struct ceph_watch_item *watchers; | |
2976 | u32 num_watchers; | |
2977 | u64 cookie; | |
2978 | int i; | |
2979 | int ret; | |
2980 | ||
2981 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
2982 | &rbd_dev->header_oloc, &watchers, | |
2983 | &num_watchers); | |
2984 | if (ret) | |
2985 | return ret; | |
2986 | ||
2987 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
2988 | for (i = 0; i < num_watchers; i++) { | |
2989 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
2990 | sizeof(locker->info.addr)) && | |
2991 | watchers[i].cookie == cookie) { | |
2992 | struct rbd_client_id cid = { | |
2993 | .gid = le64_to_cpu(watchers[i].name.num), | |
2994 | .handle = cookie, | |
2995 | }; | |
2996 | ||
2997 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
2998 | rbd_dev, cid.gid, cid.handle); | |
2999 | rbd_set_owner_cid(rbd_dev, &cid); | |
3000 | ret = 1; | |
3001 | goto out; | |
3002 | } | |
3003 | } | |
3004 | ||
3005 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
3006 | ret = 0; | |
3007 | out: | |
3008 | kfree(watchers); | |
3009 | return ret; | |
3010 | } | |
3011 | ||
3012 | /* | |
3013 | * lock_rwsem must be held for write | |
3014 | */ | |
3015 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
3016 | { | |
3017 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3018 | struct ceph_locker *lockers; | |
3019 | u32 num_lockers; | |
3020 | int ret; | |
3021 | ||
3022 | for (;;) { | |
3023 | ret = rbd_lock(rbd_dev); | |
3024 | if (ret != -EBUSY) | |
3025 | return ret; | |
3026 | ||
3027 | /* determine if the current lock holder is still alive */ | |
3028 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
3029 | if (ret) | |
3030 | return ret; | |
3031 | ||
3032 | if (num_lockers == 0) | |
3033 | goto again; | |
3034 | ||
3035 | ret = find_watcher(rbd_dev, lockers); | |
3036 | if (ret) { | |
3037 | if (ret > 0) | |
3038 | ret = 0; /* have to request lock */ | |
3039 | goto out; | |
3040 | } | |
3041 | ||
3042 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
3043 | ENTITY_NAME(lockers[0].id.name)); | |
3044 | ||
3045 | ret = ceph_monc_blacklist_add(&client->monc, | |
3046 | &lockers[0].info.addr); | |
3047 | if (ret) { | |
3048 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
3049 | ENTITY_NAME(lockers[0].id.name), ret); | |
3050 | goto out; | |
3051 | } | |
3052 | ||
3053 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
3054 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3055 | lockers[0].id.cookie, | |
3056 | &lockers[0].id.name); | |
3057 | if (ret && ret != -ENOENT) | |
3058 | goto out; | |
3059 | ||
3060 | again: | |
3061 | ceph_free_lockers(lockers, num_lockers); | |
3062 | } | |
3063 | ||
3064 | out: | |
3065 | ceph_free_lockers(lockers, num_lockers); | |
3066 | return ret; | |
3067 | } | |
3068 | ||
3069 | /* | |
3070 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
3071 | */ | |
3072 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
3073 | int *pret) | |
3074 | { | |
3075 | enum rbd_lock_state lock_state; | |
3076 | ||
3077 | down_read(&rbd_dev->lock_rwsem); | |
3078 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3079 | rbd_dev->lock_state); | |
3080 | if (__rbd_is_lock_owner(rbd_dev)) { | |
3081 | lock_state = rbd_dev->lock_state; | |
3082 | up_read(&rbd_dev->lock_rwsem); | |
3083 | return lock_state; | |
3084 | } | |
3085 | ||
3086 | up_read(&rbd_dev->lock_rwsem); | |
3087 | down_write(&rbd_dev->lock_rwsem); | |
3088 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3089 | rbd_dev->lock_state); | |
3090 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
3091 | *pret = rbd_try_lock(rbd_dev); | |
3092 | if (*pret) | |
3093 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
3094 | } | |
3095 | ||
3096 | lock_state = rbd_dev->lock_state; | |
3097 | up_write(&rbd_dev->lock_rwsem); | |
3098 | return lock_state; | |
3099 | } | |
3100 | ||
3101 | static void rbd_acquire_lock(struct work_struct *work) | |
3102 | { | |
3103 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3104 | struct rbd_device, lock_dwork); | |
3105 | enum rbd_lock_state lock_state; | |
37f13252 | 3106 | int ret = 0; |
ed95b21a ID |
3107 | |
3108 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3109 | again: | |
3110 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
3111 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
3112 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
3113 | wake_requests(rbd_dev, true); | |
3114 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
3115 | rbd_dev, lock_state, ret); | |
3116 | return; | |
3117 | } | |
3118 | ||
3119 | ret = rbd_request_lock(rbd_dev); | |
3120 | if (ret == -ETIMEDOUT) { | |
3121 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
3122 | } else if (ret == -EROFS) { |
3123 | rbd_warn(rbd_dev, "peer will not release lock"); | |
3124 | /* | |
3125 | * If this is rbd_add_acquire_lock(), we want to fail | |
3126 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
3127 | * want to block. | |
3128 | */ | |
3129 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
3130 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
3131 | /* wake "rbd map --exclusive" process */ | |
3132 | wake_requests(rbd_dev, false); | |
3133 | } | |
ed95b21a ID |
3134 | } else if (ret < 0) { |
3135 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
3136 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3137 | RBD_RETRY_DELAY); | |
3138 | } else { | |
3139 | /* | |
3140 | * lock owner acked, but resend if we don't see them | |
3141 | * release the lock | |
3142 | */ | |
3143 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
3144 | rbd_dev); | |
3145 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3146 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3147 | } | |
3148 | } | |
3149 | ||
3150 | /* | |
3151 | * lock_rwsem must be held for write | |
3152 | */ | |
3153 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3154 | { | |
3155 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3156 | rbd_dev->lock_state); | |
3157 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3158 | return false; | |
3159 | ||
3160 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3161 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3162 | /* |
ed95b21a | 3163 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3164 | * |
ed95b21a ID |
3165 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3166 | * may be shared with other devices. | |
52bb1f9b | 3167 | */ |
ed95b21a ID |
3168 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3169 | up_read(&rbd_dev->lock_rwsem); | |
3170 | ||
3171 | down_write(&rbd_dev->lock_rwsem); | |
3172 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3173 | rbd_dev->lock_state); | |
3174 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3175 | return false; | |
3176 | ||
bbead745 ID |
3177 | rbd_unlock(rbd_dev); |
3178 | /* | |
3179 | * Give others a chance to grab the lock - we would re-acquire | |
3180 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3181 | * otherwise. We need to ack our own notifications, so this | |
3182 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3183 | * after wake_requests() in rbd_handle_released_lock(). | |
3184 | */ | |
3185 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3186 | return true; |
3187 | } | |
3188 | ||
3189 | static void rbd_release_lock_work(struct work_struct *work) | |
3190 | { | |
3191 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3192 | unlock_work); | |
3193 | ||
3194 | down_write(&rbd_dev->lock_rwsem); | |
3195 | rbd_release_lock(rbd_dev); | |
3196 | up_write(&rbd_dev->lock_rwsem); | |
3197 | } | |
3198 | ||
3199 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3200 | void **p) | |
3201 | { | |
3202 | struct rbd_client_id cid = { 0 }; | |
3203 | ||
3204 | if (struct_v >= 2) { | |
3205 | cid.gid = ceph_decode_64(p); | |
3206 | cid.handle = ceph_decode_64(p); | |
3207 | } | |
3208 | ||
3209 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3210 | cid.handle); | |
3211 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3212 | down_write(&rbd_dev->lock_rwsem); | |
3213 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3214 | /* | |
3215 | * we already know that the remote client is | |
3216 | * the owner | |
3217 | */ | |
3218 | up_write(&rbd_dev->lock_rwsem); | |
3219 | return; | |
3220 | } | |
3221 | ||
3222 | rbd_set_owner_cid(rbd_dev, &cid); | |
3223 | downgrade_write(&rbd_dev->lock_rwsem); | |
3224 | } else { | |
3225 | down_read(&rbd_dev->lock_rwsem); | |
3226 | } | |
3227 | ||
3228 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3229 | wake_requests(rbd_dev, false); | |
3230 | up_read(&rbd_dev->lock_rwsem); | |
3231 | } | |
3232 | ||
3233 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3234 | void **p) | |
3235 | { | |
3236 | struct rbd_client_id cid = { 0 }; | |
3237 | ||
3238 | if (struct_v >= 2) { | |
3239 | cid.gid = ceph_decode_64(p); | |
3240 | cid.handle = ceph_decode_64(p); | |
3241 | } | |
3242 | ||
3243 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3244 | cid.handle); | |
3245 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3246 | down_write(&rbd_dev->lock_rwsem); | |
3247 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3248 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3249 | __func__, rbd_dev, cid.gid, cid.handle, | |
3250 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3251 | up_write(&rbd_dev->lock_rwsem); | |
3252 | return; | |
3253 | } | |
3254 | ||
3255 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3256 | downgrade_write(&rbd_dev->lock_rwsem); | |
3257 | } else { | |
3258 | down_read(&rbd_dev->lock_rwsem); | |
3259 | } | |
3260 | ||
3261 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3262 | wake_requests(rbd_dev, false); | |
3263 | up_read(&rbd_dev->lock_rwsem); | |
3264 | } | |
3265 | ||
3b77faa0 ID |
3266 | /* |
3267 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3268 | * ResponseMessage is needed. | |
3269 | */ | |
3270 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3271 | void **p) | |
ed95b21a ID |
3272 | { |
3273 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3274 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3275 | int result = 1; |
ed95b21a ID |
3276 | |
3277 | if (struct_v >= 2) { | |
3278 | cid.gid = ceph_decode_64(p); | |
3279 | cid.handle = ceph_decode_64(p); | |
3280 | } | |
3281 | ||
3282 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3283 | cid.handle); | |
3284 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3285 | return result; |
ed95b21a ID |
3286 | |
3287 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3288 | if (__rbd_is_lock_owner(rbd_dev)) { |
3289 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3290 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3291 | goto out_unlock; | |
3292 | ||
3293 | /* | |
3294 | * encode ResponseMessage(0) so the peer can detect | |
3295 | * a missing owner | |
3296 | */ | |
3297 | result = 0; | |
3298 | ||
3299 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3300 | if (!rbd_dev->opts->exclusive) { |
3301 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3302 | __func__, rbd_dev); | |
3303 | queue_work(rbd_dev->task_wq, | |
3304 | &rbd_dev->unlock_work); | |
3305 | } else { | |
3306 | /* refuse to release the lock */ | |
3307 | result = -EROFS; | |
3308 | } | |
ed95b21a ID |
3309 | } |
3310 | } | |
3b77faa0 ID |
3311 | |
3312 | out_unlock: | |
ed95b21a | 3313 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3314 | return result; |
ed95b21a ID |
3315 | } |
3316 | ||
3317 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3318 | u64 notify_id, u64 cookie, s32 *result) | |
3319 | { | |
3320 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
08a79102 KS |
3321 | char buf[4 + CEPH_ENCODING_START_BLK_LEN]; |
3322 | int buf_size = sizeof(buf); | |
ed95b21a ID |
3323 | int ret; |
3324 | ||
3325 | if (result) { | |
3326 | void *p = buf; | |
3327 | ||
3328 | /* encode ResponseMessage */ | |
3329 | ceph_start_encoding(&p, 1, 1, | |
3330 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3331 | ceph_encode_32(&p, *result); | |
3332 | } else { | |
3333 | buf_size = 0; | |
3334 | } | |
b8d70035 | 3335 | |
922dab61 ID |
3336 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3337 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3338 | buf, buf_size); |
52bb1f9b | 3339 | if (ret) |
ed95b21a ID |
3340 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3341 | } | |
3342 | ||
3343 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3344 | u64 cookie) | |
3345 | { | |
3346 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3347 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3348 | } | |
3349 | ||
3350 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3351 | u64 notify_id, u64 cookie, s32 result) | |
3352 | { | |
3353 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3354 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3355 | } | |
3356 | ||
3357 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3358 | u64 notifier_id, void *data, size_t data_len) | |
3359 | { | |
3360 | struct rbd_device *rbd_dev = arg; | |
3361 | void *p = data; | |
3362 | void *const end = p + data_len; | |
d4c2269b | 3363 | u8 struct_v = 0; |
ed95b21a ID |
3364 | u32 len; |
3365 | u32 notify_op; | |
3366 | int ret; | |
3367 | ||
3368 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3369 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3370 | if (data_len) { | |
3371 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3372 | &struct_v, &len); | |
3373 | if (ret) { | |
3374 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3375 | ret); | |
3376 | return; | |
3377 | } | |
3378 | ||
3379 | notify_op = ceph_decode_32(&p); | |
3380 | } else { | |
3381 | /* legacy notification for header updates */ | |
3382 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3383 | len = 0; | |
3384 | } | |
3385 | ||
3386 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3387 | switch (notify_op) { | |
3388 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3389 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3390 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3391 | break; | |
3392 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3393 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3394 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3395 | break; | |
3396 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3397 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3398 | if (ret <= 0) | |
ed95b21a | 3399 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3400 | cookie, ret); |
ed95b21a ID |
3401 | else |
3402 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3403 | break; | |
3404 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3405 | ret = rbd_dev_refresh(rbd_dev); | |
3406 | if (ret) | |
3407 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3408 | ||
3409 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3410 | break; | |
3411 | default: | |
3412 | if (rbd_is_lock_owner(rbd_dev)) | |
3413 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3414 | cookie, -EOPNOTSUPP); | |
3415 | else | |
3416 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3417 | break; | |
3418 | } | |
b8d70035 AE |
3419 | } |
3420 | ||
99d16943 ID |
3421 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3422 | ||
922dab61 | 3423 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3424 | { |
922dab61 | 3425 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3426 | |
922dab61 | 3427 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3428 | |
ed95b21a ID |
3429 | down_write(&rbd_dev->lock_rwsem); |
3430 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3431 | up_write(&rbd_dev->lock_rwsem); | |
3432 | ||
99d16943 ID |
3433 | mutex_lock(&rbd_dev->watch_mutex); |
3434 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3435 | __rbd_unregister_watch(rbd_dev); | |
3436 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3437 | |
99d16943 | 3438 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3439 | } |
99d16943 | 3440 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3441 | } |
3442 | ||
9969ebc5 | 3443 | /* |
99d16943 | 3444 | * watch_mutex must be locked |
9969ebc5 | 3445 | */ |
99d16943 | 3446 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3447 | { |
3448 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3449 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3450 | |
922dab61 | 3451 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3452 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3453 | |
922dab61 ID |
3454 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3455 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3456 | rbd_watch_errcb, rbd_dev); | |
3457 | if (IS_ERR(handle)) | |
3458 | return PTR_ERR(handle); | |
8eb87565 | 3459 | |
922dab61 | 3460 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3461 | return 0; |
b30a01f2 ID |
3462 | } |
3463 | ||
99d16943 ID |
3464 | /* |
3465 | * watch_mutex must be locked | |
3466 | */ | |
3467 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3468 | { |
922dab61 ID |
3469 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3470 | int ret; | |
b30a01f2 | 3471 | |
99d16943 ID |
3472 | rbd_assert(rbd_dev->watch_handle); |
3473 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3474 | |
922dab61 ID |
3475 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3476 | if (ret) | |
3477 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3478 | |
922dab61 | 3479 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3480 | } |
3481 | ||
99d16943 ID |
3482 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3483 | { | |
3484 | int ret; | |
3485 | ||
3486 | mutex_lock(&rbd_dev->watch_mutex); | |
3487 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3488 | ret = __rbd_register_watch(rbd_dev); | |
3489 | if (ret) | |
3490 | goto out; | |
3491 | ||
3492 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3493 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3494 | ||
3495 | out: | |
3496 | mutex_unlock(&rbd_dev->watch_mutex); | |
3497 | return ret; | |
3498 | } | |
3499 | ||
3500 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3501 | { |
99d16943 ID |
3502 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3503 | ||
ed95b21a ID |
3504 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3505 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3506 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3507 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3508 | } |
3509 | ||
3510 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3511 | { | |
ed95b21a | 3512 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3513 | cancel_tasks_sync(rbd_dev); |
3514 | ||
3515 | mutex_lock(&rbd_dev->watch_mutex); | |
3516 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3517 | __rbd_unregister_watch(rbd_dev); | |
3518 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3519 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3520 | |
23edca86 | 3521 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
811c6688 | 3522 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3523 | } |
3524 | ||
14bb211d ID |
3525 | /* |
3526 | * lock_rwsem must be held for write | |
3527 | */ | |
3528 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3529 | { | |
3530 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3531 | char cookie[32]; | |
3532 | int ret; | |
3533 | ||
3534 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3535 | ||
3536 | format_lock_cookie(rbd_dev, cookie); | |
3537 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3538 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3539 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3540 | RBD_LOCK_TAG, cookie); | |
3541 | if (ret) { | |
3542 | if (ret != -EOPNOTSUPP) | |
3543 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3544 | ret); | |
3545 | ||
3546 | /* | |
3547 | * Lock cookie cannot be updated on older OSDs, so do | |
3548 | * a manual release and queue an acquire. | |
3549 | */ | |
3550 | if (rbd_release_lock(rbd_dev)) | |
3551 | queue_delayed_work(rbd_dev->task_wq, | |
3552 | &rbd_dev->lock_dwork, 0); | |
3553 | } else { | |
edd8ca80 | 3554 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3555 | } |
3556 | } | |
3557 | ||
99d16943 ID |
3558 | static void rbd_reregister_watch(struct work_struct *work) |
3559 | { | |
3560 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3561 | struct rbd_device, watch_dwork); | |
3562 | int ret; | |
3563 | ||
3564 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3565 | ||
3566 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3567 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3568 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3569 | return; |
87c0fded | 3570 | } |
99d16943 ID |
3571 | |
3572 | ret = __rbd_register_watch(rbd_dev); | |
3573 | if (ret) { | |
3574 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3575 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3576 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3577 | wake_requests(rbd_dev, true); |
87c0fded | 3578 | } else { |
99d16943 ID |
3579 | queue_delayed_work(rbd_dev->task_wq, |
3580 | &rbd_dev->watch_dwork, | |
3581 | RBD_RETRY_DELAY); | |
87c0fded ID |
3582 | } |
3583 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3584 | return; |
99d16943 ID |
3585 | } |
3586 | ||
3587 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3588 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3589 | mutex_unlock(&rbd_dev->watch_mutex); | |
3590 | ||
14bb211d ID |
3591 | down_write(&rbd_dev->lock_rwsem); |
3592 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3593 | rbd_reacquire_lock(rbd_dev); | |
3594 | up_write(&rbd_dev->lock_rwsem); | |
3595 | ||
99d16943 ID |
3596 | ret = rbd_dev_refresh(rbd_dev); |
3597 | if (ret) | |
f6870cc9 | 3598 | rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret); |
99d16943 ID |
3599 | } |
3600 | ||
36be9a76 | 3601 | /* |
f40eb349 AE |
3602 | * Synchronous osd object method call. Returns the number of bytes |
3603 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3604 | */ |
3605 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3606 | struct ceph_object_id *oid, |
3607 | struct ceph_object_locator *oloc, | |
36be9a76 | 3608 | const char *method_name, |
4157976b | 3609 | const void *outbound, |
36be9a76 | 3610 | size_t outbound_size, |
4157976b | 3611 | void *inbound, |
e2a58ee5 | 3612 | size_t inbound_size) |
36be9a76 | 3613 | { |
ecd4a68a ID |
3614 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3615 | struct page *req_page = NULL; | |
3616 | struct page *reply_page; | |
36be9a76 AE |
3617 | int ret; |
3618 | ||
3619 | /* | |
6010a451 AE |
3620 | * Method calls are ultimately read operations. The result |
3621 | * should placed into the inbound buffer provided. They | |
3622 | * also supply outbound data--parameters for the object | |
3623 | * method. Currently if this is present it will be a | |
3624 | * snapshot id. | |
36be9a76 | 3625 | */ |
ecd4a68a ID |
3626 | if (outbound) { |
3627 | if (outbound_size > PAGE_SIZE) | |
3628 | return -E2BIG; | |
36be9a76 | 3629 | |
ecd4a68a ID |
3630 | req_page = alloc_page(GFP_KERNEL); |
3631 | if (!req_page) | |
3632 | return -ENOMEM; | |
04017e29 | 3633 | |
ecd4a68a | 3634 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3635 | } |
36be9a76 | 3636 | |
ecd4a68a ID |
3637 | reply_page = alloc_page(GFP_KERNEL); |
3638 | if (!reply_page) { | |
3639 | if (req_page) | |
3640 | __free_page(req_page); | |
3641 | return -ENOMEM; | |
3642 | } | |
57385b51 | 3643 | |
ecd4a68a ID |
3644 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3645 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3646 | reply_page, &inbound_size); | |
3647 | if (!ret) { | |
3648 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3649 | ret = inbound_size; | |
3650 | } | |
36be9a76 | 3651 | |
ecd4a68a ID |
3652 | if (req_page) |
3653 | __free_page(req_page); | |
3654 | __free_page(reply_page); | |
36be9a76 AE |
3655 | return ret; |
3656 | } | |
3657 | ||
ed95b21a ID |
3658 | /* |
3659 | * lock_rwsem must be held for read | |
3660 | */ | |
2f18d466 | 3661 | static int rbd_wait_state_locked(struct rbd_device *rbd_dev, bool may_acquire) |
ed95b21a ID |
3662 | { |
3663 | DEFINE_WAIT(wait); | |
34f55d0b | 3664 | unsigned long timeout; |
2f18d466 ID |
3665 | int ret = 0; |
3666 | ||
3667 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) | |
3668 | return -EBLACKLISTED; | |
3669 | ||
3670 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3671 | return 0; | |
3672 | ||
3673 | if (!may_acquire) { | |
3674 | rbd_warn(rbd_dev, "exclusive lock required"); | |
3675 | return -EROFS; | |
3676 | } | |
ed95b21a ID |
3677 | |
3678 | do { | |
3679 | /* | |
3680 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3681 | * and cancel_delayed_work() in wake_requests(). | |
3682 | */ | |
3683 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3684 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3685 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3686 | TASK_UNINTERRUPTIBLE); | |
3687 | up_read(&rbd_dev->lock_rwsem); | |
34f55d0b DY |
3688 | timeout = schedule_timeout(ceph_timeout_jiffies( |
3689 | rbd_dev->opts->lock_timeout)); | |
ed95b21a | 3690 | down_read(&rbd_dev->lock_rwsem); |
2f18d466 ID |
3691 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3692 | ret = -EBLACKLISTED; | |
3693 | break; | |
3694 | } | |
34f55d0b DY |
3695 | if (!timeout) { |
3696 | rbd_warn(rbd_dev, "timed out waiting for lock"); | |
3697 | ret = -ETIMEDOUT; | |
3698 | break; | |
3699 | } | |
2f18d466 | 3700 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); |
87c0fded | 3701 | |
ed95b21a | 3702 | finish_wait(&rbd_dev->lock_waitq, &wait); |
2f18d466 | 3703 | return ret; |
ed95b21a ID |
3704 | } |
3705 | ||
7ad18afa | 3706 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3707 | { |
7ad18afa CH |
3708 | struct request *rq = blk_mq_rq_from_pdu(work); |
3709 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3710 | struct rbd_img_request *img_request; |
4e752f0a | 3711 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3712 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3713 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3714 | enum obj_operation_type op_type; |
4e752f0a | 3715 | u64 mapping_size; |
80de1912 | 3716 | bool must_be_locked; |
bf0d5f50 AE |
3717 | int result; |
3718 | ||
aebf526b CH |
3719 | switch (req_op(rq)) { |
3720 | case REQ_OP_DISCARD: | |
90e98c52 | 3721 | op_type = OBJ_OP_DISCARD; |
aebf526b | 3722 | break; |
6484cbe9 ID |
3723 | case REQ_OP_WRITE_ZEROES: |
3724 | op_type = OBJ_OP_ZEROOUT; | |
3725 | break; | |
aebf526b | 3726 | case REQ_OP_WRITE: |
6d2940c8 | 3727 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
3728 | break; |
3729 | case REQ_OP_READ: | |
6d2940c8 | 3730 | op_type = OBJ_OP_READ; |
aebf526b CH |
3731 | break; |
3732 | default: | |
3733 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
3734 | result = -EIO; | |
3735 | goto err; | |
3736 | } | |
6d2940c8 | 3737 | |
bc1ecc65 | 3738 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3739 | |
bc1ecc65 ID |
3740 | if (!length) { |
3741 | dout("%s: zero-length request\n", __func__); | |
3742 | result = 0; | |
3743 | goto err_rq; | |
3744 | } | |
bf0d5f50 | 3745 | |
9568c93e ID |
3746 | rbd_assert(op_type == OBJ_OP_READ || |
3747 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 3748 | |
bc1ecc65 ID |
3749 | /* |
3750 | * Quit early if the mapped snapshot no longer exists. It's | |
3751 | * still possible the snapshot will have disappeared by the | |
3752 | * time our request arrives at the osd, but there's no sense in | |
3753 | * sending it if we already know. | |
3754 | */ | |
3755 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3756 | dout("request for non-existent snapshot"); | |
3757 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3758 | result = -ENXIO; | |
3759 | goto err_rq; | |
3760 | } | |
4dda41d3 | 3761 | |
bc1ecc65 ID |
3762 | if (offset && length > U64_MAX - offset + 1) { |
3763 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3764 | length); | |
3765 | result = -EINVAL; | |
3766 | goto err_rq; /* Shouldn't happen */ | |
3767 | } | |
4dda41d3 | 3768 | |
7ad18afa CH |
3769 | blk_mq_start_request(rq); |
3770 | ||
4e752f0a JD |
3771 | down_read(&rbd_dev->header_rwsem); |
3772 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3773 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3774 | snapc = rbd_dev->header.snapc; |
3775 | ceph_get_snap_context(snapc); | |
3776 | } | |
3777 | up_read(&rbd_dev->header_rwsem); | |
3778 | ||
3779 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3780 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3781 | length, mapping_size); |
bc1ecc65 ID |
3782 | result = -EIO; |
3783 | goto err_rq; | |
3784 | } | |
bf0d5f50 | 3785 | |
f9bebd58 ID |
3786 | must_be_locked = |
3787 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
3788 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
3789 | if (must_be_locked) { |
3790 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 ID |
3791 | result = rbd_wait_state_locked(rbd_dev, |
3792 | !rbd_dev->opts->exclusive); | |
3793 | if (result) | |
87c0fded | 3794 | goto err_unlock; |
ed95b21a ID |
3795 | } |
3796 | ||
dfd9875f | 3797 | img_request = rbd_img_request_create(rbd_dev, op_type, snapc); |
bc1ecc65 ID |
3798 | if (!img_request) { |
3799 | result = -ENOMEM; | |
ed95b21a | 3800 | goto err_unlock; |
bc1ecc65 ID |
3801 | } |
3802 | img_request->rq = rq; | |
70b16db8 | 3803 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3804 | |
6484cbe9 | 3805 | if (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_ZEROOUT) |
5a237819 | 3806 | result = rbd_img_fill_nodata(img_request, offset, length); |
90e98c52 | 3807 | else |
5a237819 ID |
3808 | result = rbd_img_fill_from_bio(img_request, offset, length, |
3809 | rq->bio); | |
0c93e1b7 | 3810 | if (result || !img_request->pending_count) |
bc1ecc65 | 3811 | goto err_img_request; |
bf0d5f50 | 3812 | |
efbd1a11 | 3813 | rbd_img_request_submit(img_request); |
ed95b21a ID |
3814 | if (must_be_locked) |
3815 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 3816 | return; |
bf0d5f50 | 3817 | |
bc1ecc65 ID |
3818 | err_img_request: |
3819 | rbd_img_request_put(img_request); | |
ed95b21a ID |
3820 | err_unlock: |
3821 | if (must_be_locked) | |
3822 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
3823 | err_rq: |
3824 | if (result) | |
3825 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3826 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3827 | ceph_put_snap_context(snapc); |
7ad18afa | 3828 | err: |
2a842aca | 3829 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 3830 | } |
bf0d5f50 | 3831 | |
fc17b653 | 3832 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 3833 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 3834 | { |
7ad18afa CH |
3835 | struct request *rq = bd->rq; |
3836 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3837 | |
7ad18afa | 3838 | queue_work(rbd_wq, work); |
fc17b653 | 3839 | return BLK_STS_OK; |
bf0d5f50 AE |
3840 | } |
3841 | ||
602adf40 YS |
3842 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3843 | { | |
5769ed0c ID |
3844 | blk_cleanup_queue(rbd_dev->disk->queue); |
3845 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
3846 | put_disk(rbd_dev->disk); | |
a0cab924 | 3847 | rbd_dev->disk = NULL; |
602adf40 YS |
3848 | } |
3849 | ||
788e2df3 | 3850 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
3851 | struct ceph_object_id *oid, |
3852 | struct ceph_object_locator *oloc, | |
3853 | void *buf, int buf_len) | |
788e2df3 AE |
3854 | |
3855 | { | |
fe5478e0 ID |
3856 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3857 | struct ceph_osd_request *req; | |
3858 | struct page **pages; | |
3859 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
3860 | int ret; |
3861 | ||
fe5478e0 ID |
3862 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
3863 | if (!req) | |
3864 | return -ENOMEM; | |
788e2df3 | 3865 | |
fe5478e0 ID |
3866 | ceph_oid_copy(&req->r_base_oid, oid); |
3867 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
3868 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 3869 | |
fe5478e0 ID |
3870 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
3871 | if (IS_ERR(pages)) { | |
3872 | ret = PTR_ERR(pages); | |
3873 | goto out_req; | |
3874 | } | |
1ceae7ef | 3875 | |
fe5478e0 ID |
3876 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
3877 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
3878 | true); | |
3879 | ||
26f887e0 ID |
3880 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
3881 | if (ret) | |
3882 | goto out_req; | |
3883 | ||
fe5478e0 ID |
3884 | ceph_osdc_start_request(osdc, req, false); |
3885 | ret = ceph_osdc_wait_request(osdc, req); | |
3886 | if (ret >= 0) | |
3887 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 3888 | |
fe5478e0 ID |
3889 | out_req: |
3890 | ceph_osdc_put_request(req); | |
788e2df3 AE |
3891 | return ret; |
3892 | } | |
3893 | ||
602adf40 | 3894 | /* |
662518b1 AE |
3895 | * Read the complete header for the given rbd device. On successful |
3896 | * return, the rbd_dev->header field will contain up-to-date | |
3897 | * information about the image. | |
602adf40 | 3898 | */ |
99a41ebc | 3899 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3900 | { |
4156d998 | 3901 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3902 | u32 snap_count = 0; |
4156d998 AE |
3903 | u64 names_size = 0; |
3904 | u32 want_count; | |
3905 | int ret; | |
602adf40 | 3906 | |
00f1f36f | 3907 | /* |
4156d998 AE |
3908 | * The complete header will include an array of its 64-bit |
3909 | * snapshot ids, followed by the names of those snapshots as | |
3910 | * a contiguous block of NUL-terminated strings. Note that | |
3911 | * the number of snapshots could change by the time we read | |
3912 | * it in, in which case we re-read it. | |
00f1f36f | 3913 | */ |
4156d998 AE |
3914 | do { |
3915 | size_t size; | |
3916 | ||
3917 | kfree(ondisk); | |
3918 | ||
3919 | size = sizeof (*ondisk); | |
3920 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3921 | size += names_size; | |
3922 | ondisk = kmalloc(size, GFP_KERNEL); | |
3923 | if (!ondisk) | |
662518b1 | 3924 | return -ENOMEM; |
4156d998 | 3925 | |
fe5478e0 ID |
3926 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
3927 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 3928 | if (ret < 0) |
662518b1 | 3929 | goto out; |
c0cd10db | 3930 | if ((size_t)ret < size) { |
4156d998 | 3931 | ret = -ENXIO; |
06ecc6cb AE |
3932 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3933 | size, ret); | |
662518b1 | 3934 | goto out; |
4156d998 AE |
3935 | } |
3936 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3937 | ret = -ENXIO; | |
06ecc6cb | 3938 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3939 | goto out; |
81e759fb | 3940 | } |
602adf40 | 3941 | |
4156d998 AE |
3942 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3943 | want_count = snap_count; | |
3944 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3945 | } while (snap_count != want_count); | |
00f1f36f | 3946 | |
662518b1 AE |
3947 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3948 | out: | |
4156d998 AE |
3949 | kfree(ondisk); |
3950 | ||
3951 | return ret; | |
602adf40 YS |
3952 | } |
3953 | ||
15228ede AE |
3954 | /* |
3955 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3956 | * has disappeared from the (just updated) snapshot context. | |
3957 | */ | |
3958 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3959 | { | |
3960 | u64 snap_id; | |
3961 | ||
3962 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3963 | return; | |
3964 | ||
3965 | snap_id = rbd_dev->spec->snap_id; | |
3966 | if (snap_id == CEPH_NOSNAP) | |
3967 | return; | |
3968 | ||
3969 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3970 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3971 | } | |
3972 | ||
9875201e JD |
3973 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3974 | { | |
3975 | sector_t size; | |
9875201e JD |
3976 | |
3977 | /* | |
811c6688 ID |
3978 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3979 | * try to update its size. If REMOVING is set, updating size | |
3980 | * is just useless work since the device can't be opened. | |
9875201e | 3981 | */ |
811c6688 ID |
3982 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3983 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3984 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3985 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3986 | set_capacity(rbd_dev->disk, size); | |
3987 | revalidate_disk(rbd_dev->disk); | |
3988 | } | |
3989 | } | |
3990 | ||
cc4a38bd | 3991 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3992 | { |
e627db08 | 3993 | u64 mapping_size; |
1fe5e993 AE |
3994 | int ret; |
3995 | ||
cfbf6377 | 3996 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3997 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3998 | |
3999 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 4000 | if (ret) |
73e39e4d | 4001 | goto out; |
15228ede | 4002 | |
e8f59b59 ID |
4003 | /* |
4004 | * If there is a parent, see if it has disappeared due to the | |
4005 | * mapped image getting flattened. | |
4006 | */ | |
4007 | if (rbd_dev->parent) { | |
4008 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4009 | if (ret) | |
73e39e4d | 4010 | goto out; |
e8f59b59 ID |
4011 | } |
4012 | ||
5ff1108c | 4013 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 4014 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
4015 | } else { |
4016 | /* validate mapped snapshot's EXISTS flag */ | |
4017 | rbd_exists_validate(rbd_dev); | |
4018 | } | |
15228ede | 4019 | |
73e39e4d | 4020 | out: |
cfbf6377 | 4021 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 4022 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 4023 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 4024 | |
73e39e4d | 4025 | return ret; |
1fe5e993 AE |
4026 | } |
4027 | ||
d6296d39 CH |
4028 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
4029 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
4030 | { |
4031 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
4032 | ||
4033 | INIT_WORK(work, rbd_queue_workfn); | |
4034 | return 0; | |
4035 | } | |
4036 | ||
f363b089 | 4037 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 4038 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
4039 | .init_request = rbd_init_request, |
4040 | }; | |
4041 | ||
602adf40 YS |
4042 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
4043 | { | |
4044 | struct gendisk *disk; | |
4045 | struct request_queue *q; | |
420efbdf ID |
4046 | unsigned int objset_bytes = |
4047 | rbd_dev->layout.object_size * rbd_dev->layout.stripe_count; | |
7ad18afa | 4048 | int err; |
602adf40 | 4049 | |
602adf40 | 4050 | /* create gendisk info */ |
7e513d43 ID |
4051 | disk = alloc_disk(single_major ? |
4052 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
4053 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 4054 | if (!disk) |
1fcdb8aa | 4055 | return -ENOMEM; |
602adf40 | 4056 | |
f0f8cef5 | 4057 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 4058 | rbd_dev->dev_id); |
602adf40 | 4059 | disk->major = rbd_dev->major; |
dd82fff1 | 4060 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
4061 | if (single_major) |
4062 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
4063 | disk->fops = &rbd_bd_ops; |
4064 | disk->private_data = rbd_dev; | |
4065 | ||
7ad18afa CH |
4066 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
4067 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 4068 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 4069 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 4070 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
4071 | rbd_dev->tag_set.nr_hw_queues = 1; |
4072 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
4073 | ||
4074 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
4075 | if (err) | |
602adf40 | 4076 | goto out_disk; |
029bcbd8 | 4077 | |
7ad18afa CH |
4078 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
4079 | if (IS_ERR(q)) { | |
4080 | err = PTR_ERR(q); | |
4081 | goto out_tag_set; | |
4082 | } | |
4083 | ||
8b904b5b | 4084 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
d8a2c89c | 4085 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
593a9e7b | 4086 | |
420efbdf | 4087 | blk_queue_max_hw_sectors(q, objset_bytes >> SECTOR_SHIFT); |
0d9fde4f | 4088 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 4089 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 4090 | blk_queue_max_segment_size(q, UINT_MAX); |
420efbdf ID |
4091 | blk_queue_io_min(q, objset_bytes); |
4092 | blk_queue_io_opt(q, objset_bytes); | |
029bcbd8 | 4093 | |
d9360540 ID |
4094 | if (rbd_dev->opts->trim) { |
4095 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); | |
4096 | q->limits.discard_granularity = objset_bytes; | |
4097 | blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
4098 | blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT); | |
4099 | } | |
90e98c52 | 4100 | |
bae818ee | 4101 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 4102 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 4103 | |
5769ed0c ID |
4104 | /* |
4105 | * disk_release() expects a queue ref from add_disk() and will | |
4106 | * put it. Hold an extra ref until add_disk() is called. | |
4107 | */ | |
4108 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 4109 | disk->queue = q; |
602adf40 YS |
4110 | q->queuedata = rbd_dev; |
4111 | ||
4112 | rbd_dev->disk = disk; | |
602adf40 | 4113 | |
602adf40 | 4114 | return 0; |
7ad18afa CH |
4115 | out_tag_set: |
4116 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
4117 | out_disk: |
4118 | put_disk(disk); | |
7ad18afa | 4119 | return err; |
602adf40 YS |
4120 | } |
4121 | ||
dfc5606d YS |
4122 | /* |
4123 | sysfs | |
4124 | */ | |
4125 | ||
593a9e7b AE |
4126 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
4127 | { | |
4128 | return container_of(dev, struct rbd_device, dev); | |
4129 | } | |
4130 | ||
dfc5606d YS |
4131 | static ssize_t rbd_size_show(struct device *dev, |
4132 | struct device_attribute *attr, char *buf) | |
4133 | { | |
593a9e7b | 4134 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 4135 | |
fc71d833 AE |
4136 | return sprintf(buf, "%llu\n", |
4137 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
4138 | } |
4139 | ||
34b13184 AE |
4140 | /* |
4141 | * Note this shows the features for whatever's mapped, which is not | |
4142 | * necessarily the base image. | |
4143 | */ | |
4144 | static ssize_t rbd_features_show(struct device *dev, | |
4145 | struct device_attribute *attr, char *buf) | |
4146 | { | |
4147 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4148 | ||
4149 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 4150 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
4151 | } |
4152 | ||
dfc5606d YS |
4153 | static ssize_t rbd_major_show(struct device *dev, |
4154 | struct device_attribute *attr, char *buf) | |
4155 | { | |
593a9e7b | 4156 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4157 | |
fc71d833 AE |
4158 | if (rbd_dev->major) |
4159 | return sprintf(buf, "%d\n", rbd_dev->major); | |
4160 | ||
4161 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4162 | } |
4163 | ||
4164 | static ssize_t rbd_minor_show(struct device *dev, | |
4165 | struct device_attribute *attr, char *buf) | |
4166 | { | |
4167 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4168 | |
dd82fff1 | 4169 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4170 | } |
4171 | ||
005a07bf ID |
4172 | static ssize_t rbd_client_addr_show(struct device *dev, |
4173 | struct device_attribute *attr, char *buf) | |
4174 | { | |
4175 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4176 | struct ceph_entity_addr *client_addr = | |
4177 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4178 | ||
4179 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4180 | le32_to_cpu(client_addr->nonce)); | |
4181 | } | |
4182 | ||
dfc5606d YS |
4183 | static ssize_t rbd_client_id_show(struct device *dev, |
4184 | struct device_attribute *attr, char *buf) | |
602adf40 | 4185 | { |
593a9e7b | 4186 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4187 | |
1dbb4399 | 4188 | return sprintf(buf, "client%lld\n", |
033268a5 | 4189 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4190 | } |
4191 | ||
267fb90b MC |
4192 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4193 | struct device_attribute *attr, char *buf) | |
4194 | { | |
4195 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4196 | ||
4197 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4198 | } | |
4199 | ||
0d6d1e9c MC |
4200 | static ssize_t rbd_config_info_show(struct device *dev, |
4201 | struct device_attribute *attr, char *buf) | |
4202 | { | |
4203 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4204 | ||
4205 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4206 | } |
4207 | ||
dfc5606d YS |
4208 | static ssize_t rbd_pool_show(struct device *dev, |
4209 | struct device_attribute *attr, char *buf) | |
602adf40 | 4210 | { |
593a9e7b | 4211 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4212 | |
0d7dbfce | 4213 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4214 | } |
4215 | ||
9bb2f334 AE |
4216 | static ssize_t rbd_pool_id_show(struct device *dev, |
4217 | struct device_attribute *attr, char *buf) | |
4218 | { | |
4219 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4220 | ||
0d7dbfce | 4221 | return sprintf(buf, "%llu\n", |
fc71d833 | 4222 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4223 | } |
4224 | ||
b26c047b ID |
4225 | static ssize_t rbd_pool_ns_show(struct device *dev, |
4226 | struct device_attribute *attr, char *buf) | |
4227 | { | |
4228 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4229 | ||
4230 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_ns ?: ""); | |
4231 | } | |
4232 | ||
dfc5606d YS |
4233 | static ssize_t rbd_name_show(struct device *dev, |
4234 | struct device_attribute *attr, char *buf) | |
4235 | { | |
593a9e7b | 4236 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4237 | |
a92ffdf8 AE |
4238 | if (rbd_dev->spec->image_name) |
4239 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4240 | ||
4241 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4242 | } |
4243 | ||
589d30e0 AE |
4244 | static ssize_t rbd_image_id_show(struct device *dev, |
4245 | struct device_attribute *attr, char *buf) | |
4246 | { | |
4247 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4248 | ||
0d7dbfce | 4249 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4250 | } |
4251 | ||
34b13184 AE |
4252 | /* |
4253 | * Shows the name of the currently-mapped snapshot (or | |
4254 | * RBD_SNAP_HEAD_NAME for the base image). | |
4255 | */ | |
dfc5606d YS |
4256 | static ssize_t rbd_snap_show(struct device *dev, |
4257 | struct device_attribute *attr, | |
4258 | char *buf) | |
4259 | { | |
593a9e7b | 4260 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4261 | |
0d7dbfce | 4262 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4263 | } |
4264 | ||
92a58671 MC |
4265 | static ssize_t rbd_snap_id_show(struct device *dev, |
4266 | struct device_attribute *attr, char *buf) | |
4267 | { | |
4268 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4269 | ||
4270 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4271 | } | |
4272 | ||
86b00e0d | 4273 | /* |
ff96128f ID |
4274 | * For a v2 image, shows the chain of parent images, separated by empty |
4275 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4276 | * image)". | |
86b00e0d AE |
4277 | */ |
4278 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4279 | struct device_attribute *attr, |
4280 | char *buf) | |
86b00e0d AE |
4281 | { |
4282 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4283 | ssize_t count = 0; |
86b00e0d | 4284 | |
ff96128f | 4285 | if (!rbd_dev->parent) |
86b00e0d AE |
4286 | return sprintf(buf, "(no parent image)\n"); |
4287 | ||
ff96128f ID |
4288 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4289 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4290 | ||
4291 | count += sprintf(&buf[count], "%s" | |
4292 | "pool_id %llu\npool_name %s\n" | |
e92c0eaf | 4293 | "pool_ns %s\n" |
ff96128f ID |
4294 | "image_id %s\nimage_name %s\n" |
4295 | "snap_id %llu\nsnap_name %s\n" | |
4296 | "overlap %llu\n", | |
4297 | !count ? "" : "\n", /* first? */ | |
4298 | spec->pool_id, spec->pool_name, | |
e92c0eaf | 4299 | spec->pool_ns ?: "", |
ff96128f ID |
4300 | spec->image_id, spec->image_name ?: "(unknown)", |
4301 | spec->snap_id, spec->snap_name, | |
4302 | rbd_dev->parent_overlap); | |
4303 | } | |
4304 | ||
4305 | return count; | |
86b00e0d AE |
4306 | } |
4307 | ||
dfc5606d YS |
4308 | static ssize_t rbd_image_refresh(struct device *dev, |
4309 | struct device_attribute *attr, | |
4310 | const char *buf, | |
4311 | size_t size) | |
4312 | { | |
593a9e7b | 4313 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4314 | int ret; |
602adf40 | 4315 | |
cc4a38bd | 4316 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4317 | if (ret) |
52bb1f9b | 4318 | return ret; |
b813623a | 4319 | |
52bb1f9b | 4320 | return size; |
dfc5606d | 4321 | } |
602adf40 | 4322 | |
5657a819 JP |
4323 | static DEVICE_ATTR(size, 0444, rbd_size_show, NULL); |
4324 | static DEVICE_ATTR(features, 0444, rbd_features_show, NULL); | |
4325 | static DEVICE_ATTR(major, 0444, rbd_major_show, NULL); | |
4326 | static DEVICE_ATTR(minor, 0444, rbd_minor_show, NULL); | |
4327 | static DEVICE_ATTR(client_addr, 0444, rbd_client_addr_show, NULL); | |
4328 | static DEVICE_ATTR(client_id, 0444, rbd_client_id_show, NULL); | |
4329 | static DEVICE_ATTR(cluster_fsid, 0444, rbd_cluster_fsid_show, NULL); | |
4330 | static DEVICE_ATTR(config_info, 0400, rbd_config_info_show, NULL); | |
4331 | static DEVICE_ATTR(pool, 0444, rbd_pool_show, NULL); | |
4332 | static DEVICE_ATTR(pool_id, 0444, rbd_pool_id_show, NULL); | |
b26c047b | 4333 | static DEVICE_ATTR(pool_ns, 0444, rbd_pool_ns_show, NULL); |
5657a819 JP |
4334 | static DEVICE_ATTR(name, 0444, rbd_name_show, NULL); |
4335 | static DEVICE_ATTR(image_id, 0444, rbd_image_id_show, NULL); | |
4336 | static DEVICE_ATTR(refresh, 0200, NULL, rbd_image_refresh); | |
4337 | static DEVICE_ATTR(current_snap, 0444, rbd_snap_show, NULL); | |
4338 | static DEVICE_ATTR(snap_id, 0444, rbd_snap_id_show, NULL); | |
4339 | static DEVICE_ATTR(parent, 0444, rbd_parent_show, NULL); | |
dfc5606d YS |
4340 | |
4341 | static struct attribute *rbd_attrs[] = { | |
4342 | &dev_attr_size.attr, | |
34b13184 | 4343 | &dev_attr_features.attr, |
dfc5606d | 4344 | &dev_attr_major.attr, |
dd82fff1 | 4345 | &dev_attr_minor.attr, |
005a07bf | 4346 | &dev_attr_client_addr.attr, |
dfc5606d | 4347 | &dev_attr_client_id.attr, |
267fb90b | 4348 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4349 | &dev_attr_config_info.attr, |
dfc5606d | 4350 | &dev_attr_pool.attr, |
9bb2f334 | 4351 | &dev_attr_pool_id.attr, |
b26c047b | 4352 | &dev_attr_pool_ns.attr, |
dfc5606d | 4353 | &dev_attr_name.attr, |
589d30e0 | 4354 | &dev_attr_image_id.attr, |
dfc5606d | 4355 | &dev_attr_current_snap.attr, |
92a58671 | 4356 | &dev_attr_snap_id.attr, |
86b00e0d | 4357 | &dev_attr_parent.attr, |
dfc5606d | 4358 | &dev_attr_refresh.attr, |
dfc5606d YS |
4359 | NULL |
4360 | }; | |
4361 | ||
4362 | static struct attribute_group rbd_attr_group = { | |
4363 | .attrs = rbd_attrs, | |
4364 | }; | |
4365 | ||
4366 | static const struct attribute_group *rbd_attr_groups[] = { | |
4367 | &rbd_attr_group, | |
4368 | NULL | |
4369 | }; | |
4370 | ||
6cac4695 | 4371 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4372 | |
b9942bc9 | 4373 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4374 | .name = "rbd", |
4375 | .groups = rbd_attr_groups, | |
6cac4695 | 4376 | .release = rbd_dev_release, |
dfc5606d YS |
4377 | }; |
4378 | ||
8b8fb99c AE |
4379 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4380 | { | |
4381 | kref_get(&spec->kref); | |
4382 | ||
4383 | return spec; | |
4384 | } | |
4385 | ||
4386 | static void rbd_spec_free(struct kref *kref); | |
4387 | static void rbd_spec_put(struct rbd_spec *spec) | |
4388 | { | |
4389 | if (spec) | |
4390 | kref_put(&spec->kref, rbd_spec_free); | |
4391 | } | |
4392 | ||
4393 | static struct rbd_spec *rbd_spec_alloc(void) | |
4394 | { | |
4395 | struct rbd_spec *spec; | |
4396 | ||
4397 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4398 | if (!spec) | |
4399 | return NULL; | |
04077599 ID |
4400 | |
4401 | spec->pool_id = CEPH_NOPOOL; | |
4402 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4403 | kref_init(&spec->kref); |
4404 | ||
8b8fb99c AE |
4405 | return spec; |
4406 | } | |
4407 | ||
4408 | static void rbd_spec_free(struct kref *kref) | |
4409 | { | |
4410 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4411 | ||
4412 | kfree(spec->pool_name); | |
b26c047b | 4413 | kfree(spec->pool_ns); |
8b8fb99c AE |
4414 | kfree(spec->image_id); |
4415 | kfree(spec->image_name); | |
4416 | kfree(spec->snap_name); | |
4417 | kfree(spec); | |
4418 | } | |
4419 | ||
1643dfa4 | 4420 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4421 | { |
99d16943 | 4422 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4423 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4424 | |
c41d13a3 | 4425 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4426 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4427 | kfree(rbd_dev->config_info); |
c41d13a3 | 4428 | |
dd5ac32d ID |
4429 | rbd_put_client(rbd_dev->rbd_client); |
4430 | rbd_spec_put(rbd_dev->spec); | |
4431 | kfree(rbd_dev->opts); | |
4432 | kfree(rbd_dev); | |
1643dfa4 ID |
4433 | } |
4434 | ||
4435 | static void rbd_dev_release(struct device *dev) | |
4436 | { | |
4437 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4438 | bool need_put = !!rbd_dev->opts; | |
4439 | ||
4440 | if (need_put) { | |
4441 | destroy_workqueue(rbd_dev->task_wq); | |
4442 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4443 | } | |
4444 | ||
4445 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4446 | |
4447 | /* | |
4448 | * This is racy, but way better than putting module outside of | |
4449 | * the release callback. The race window is pretty small, so | |
4450 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4451 | */ | |
4452 | if (need_put) | |
4453 | module_put(THIS_MODULE); | |
4454 | } | |
4455 | ||
1643dfa4 ID |
4456 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4457 | struct rbd_spec *spec) | |
c53d5893 AE |
4458 | { |
4459 | struct rbd_device *rbd_dev; | |
4460 | ||
1643dfa4 | 4461 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4462 | if (!rbd_dev) |
4463 | return NULL; | |
4464 | ||
4465 | spin_lock_init(&rbd_dev->lock); | |
4466 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4467 | init_rwsem(&rbd_dev->header_rwsem); |
4468 | ||
7e97332e | 4469 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4470 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4471 | rbd_dev->header_oloc.pool = spec->pool_id; |
b26c047b ID |
4472 | if (spec->pool_ns) { |
4473 | WARN_ON(!*spec->pool_ns); | |
4474 | rbd_dev->header_oloc.pool_ns = | |
4475 | ceph_find_or_create_string(spec->pool_ns, | |
4476 | strlen(spec->pool_ns)); | |
4477 | } | |
c41d13a3 | 4478 | |
99d16943 ID |
4479 | mutex_init(&rbd_dev->watch_mutex); |
4480 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4481 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4482 | ||
ed95b21a ID |
4483 | init_rwsem(&rbd_dev->lock_rwsem); |
4484 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4485 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4486 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4487 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4488 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4489 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4490 | ||
dd5ac32d ID |
4491 | rbd_dev->dev.bus = &rbd_bus_type; |
4492 | rbd_dev->dev.type = &rbd_device_type; | |
4493 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4494 | device_initialize(&rbd_dev->dev); |
4495 | ||
c53d5893 | 4496 | rbd_dev->rbd_client = rbdc; |
d147543d | 4497 | rbd_dev->spec = spec; |
0903e875 | 4498 | |
1643dfa4 ID |
4499 | return rbd_dev; |
4500 | } | |
4501 | ||
4502 | /* | |
4503 | * Create a mapping rbd_dev. | |
4504 | */ | |
4505 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4506 | struct rbd_spec *spec, | |
4507 | struct rbd_options *opts) | |
4508 | { | |
4509 | struct rbd_device *rbd_dev; | |
4510 | ||
4511 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4512 | if (!rbd_dev) | |
4513 | return NULL; | |
4514 | ||
4515 | rbd_dev->opts = opts; | |
4516 | ||
4517 | /* get an id and fill in device name */ | |
4518 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4519 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4520 | GFP_KERNEL); | |
4521 | if (rbd_dev->dev_id < 0) | |
4522 | goto fail_rbd_dev; | |
4523 | ||
4524 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4525 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4526 | rbd_dev->name); | |
4527 | if (!rbd_dev->task_wq) | |
4528 | goto fail_dev_id; | |
dd5ac32d | 4529 | |
1643dfa4 ID |
4530 | /* we have a ref from do_rbd_add() */ |
4531 | __module_get(THIS_MODULE); | |
dd5ac32d | 4532 | |
1643dfa4 | 4533 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4534 | return rbd_dev; |
1643dfa4 ID |
4535 | |
4536 | fail_dev_id: | |
4537 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4538 | fail_rbd_dev: | |
4539 | rbd_dev_free(rbd_dev); | |
4540 | return NULL; | |
c53d5893 AE |
4541 | } |
4542 | ||
4543 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4544 | { | |
dd5ac32d ID |
4545 | if (rbd_dev) |
4546 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4547 | } |
4548 | ||
9d475de5 AE |
4549 | /* |
4550 | * Get the size and object order for an image snapshot, or if | |
4551 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4552 | * image. | |
4553 | */ | |
4554 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4555 | u8 *order, u64 *snap_size) | |
4556 | { | |
4557 | __le64 snapid = cpu_to_le64(snap_id); | |
4558 | int ret; | |
4559 | struct { | |
4560 | u8 order; | |
4561 | __le64 size; | |
4562 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4563 | ||
ecd4a68a ID |
4564 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4565 | &rbd_dev->header_oloc, "get_size", | |
4566 | &snapid, sizeof(snapid), | |
4567 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4568 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4569 | if (ret < 0) |
4570 | return ret; | |
57385b51 AE |
4571 | if (ret < sizeof (size_buf)) |
4572 | return -ERANGE; | |
9d475de5 | 4573 | |
c3545579 | 4574 | if (order) { |
c86f86e9 | 4575 | *order = size_buf.order; |
c3545579 JD |
4576 | dout(" order %u", (unsigned int)*order); |
4577 | } | |
9d475de5 AE |
4578 | *snap_size = le64_to_cpu(size_buf.size); |
4579 | ||
c3545579 JD |
4580 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4581 | (unsigned long long)snap_id, | |
57385b51 | 4582 | (unsigned long long)*snap_size); |
9d475de5 AE |
4583 | |
4584 | return 0; | |
4585 | } | |
4586 | ||
4587 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4588 | { | |
4589 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4590 | &rbd_dev->header.obj_order, | |
4591 | &rbd_dev->header.image_size); | |
4592 | } | |
4593 | ||
1e130199 AE |
4594 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4595 | { | |
4596 | void *reply_buf; | |
4597 | int ret; | |
4598 | void *p; | |
4599 | ||
4600 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4601 | if (!reply_buf) | |
4602 | return -ENOMEM; | |
4603 | ||
ecd4a68a ID |
4604 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4605 | &rbd_dev->header_oloc, "get_object_prefix", | |
4606 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4607 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4608 | if (ret < 0) |
4609 | goto out; | |
4610 | ||
4611 | p = reply_buf; | |
4612 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4613 | p + ret, NULL, GFP_NOIO); |
4614 | ret = 0; | |
1e130199 AE |
4615 | |
4616 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4617 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4618 | rbd_dev->header.object_prefix = NULL; | |
4619 | } else { | |
4620 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4621 | } | |
1e130199 AE |
4622 | out: |
4623 | kfree(reply_buf); | |
4624 | ||
4625 | return ret; | |
4626 | } | |
4627 | ||
b1b5402a AE |
4628 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4629 | u64 *snap_features) | |
4630 | { | |
4631 | __le64 snapid = cpu_to_le64(snap_id); | |
4632 | struct { | |
4633 | __le64 features; | |
4634 | __le64 incompat; | |
4157976b | 4635 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4636 | u64 unsup; |
b1b5402a AE |
4637 | int ret; |
4638 | ||
ecd4a68a ID |
4639 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4640 | &rbd_dev->header_oloc, "get_features", | |
4641 | &snapid, sizeof(snapid), | |
4642 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4643 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4644 | if (ret < 0) |
4645 | return ret; | |
57385b51 AE |
4646 | if (ret < sizeof (features_buf)) |
4647 | return -ERANGE; | |
d889140c | 4648 | |
d3767f0f ID |
4649 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4650 | if (unsup) { | |
4651 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4652 | unsup); | |
b8f5c6ed | 4653 | return -ENXIO; |
d3767f0f | 4654 | } |
d889140c | 4655 | |
b1b5402a AE |
4656 | *snap_features = le64_to_cpu(features_buf.features); |
4657 | ||
4658 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4659 | (unsigned long long)snap_id, |
4660 | (unsigned long long)*snap_features, | |
4661 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4662 | |
4663 | return 0; | |
4664 | } | |
4665 | ||
4666 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4667 | { | |
4668 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4669 | &rbd_dev->header.features); | |
4670 | } | |
4671 | ||
eb3b2d6b ID |
4672 | struct parent_image_info { |
4673 | u64 pool_id; | |
e92c0eaf | 4674 | const char *pool_ns; |
eb3b2d6b ID |
4675 | const char *image_id; |
4676 | u64 snap_id; | |
4677 | ||
e92c0eaf | 4678 | bool has_overlap; |
eb3b2d6b ID |
4679 | u64 overlap; |
4680 | }; | |
4681 | ||
e92c0eaf ID |
4682 | /* |
4683 | * The caller is responsible for @pii. | |
4684 | */ | |
4685 | static int decode_parent_image_spec(void **p, void *end, | |
4686 | struct parent_image_info *pii) | |
4687 | { | |
4688 | u8 struct_v; | |
4689 | u32 struct_len; | |
4690 | int ret; | |
4691 | ||
4692 | ret = ceph_start_decoding(p, end, 1, "ParentImageSpec", | |
4693 | &struct_v, &struct_len); | |
4694 | if (ret) | |
4695 | return ret; | |
4696 | ||
4697 | ceph_decode_64_safe(p, end, pii->pool_id, e_inval); | |
4698 | pii->pool_ns = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
4699 | if (IS_ERR(pii->pool_ns)) { | |
4700 | ret = PTR_ERR(pii->pool_ns); | |
4701 | pii->pool_ns = NULL; | |
4702 | return ret; | |
4703 | } | |
4704 | pii->image_id = ceph_extract_encoded_string(p, end, NULL, GFP_KERNEL); | |
4705 | if (IS_ERR(pii->image_id)) { | |
4706 | ret = PTR_ERR(pii->image_id); | |
4707 | pii->image_id = NULL; | |
4708 | return ret; | |
4709 | } | |
4710 | ceph_decode_64_safe(p, end, pii->snap_id, e_inval); | |
4711 | return 0; | |
4712 | ||
4713 | e_inval: | |
4714 | return -EINVAL; | |
4715 | } | |
4716 | ||
4717 | static int __get_parent_info(struct rbd_device *rbd_dev, | |
4718 | struct page *req_page, | |
4719 | struct page *reply_page, | |
4720 | struct parent_image_info *pii) | |
4721 | { | |
4722 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
4723 | size_t reply_len = PAGE_SIZE; | |
4724 | void *p, *end; | |
4725 | int ret; | |
4726 | ||
4727 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4728 | "rbd", "parent_get", CEPH_OSD_FLAG_READ, | |
4729 | req_page, sizeof(u64), reply_page, &reply_len); | |
4730 | if (ret) | |
4731 | return ret == -EOPNOTSUPP ? 1 : ret; | |
4732 | ||
4733 | p = page_address(reply_page); | |
4734 | end = p + reply_len; | |
4735 | ret = decode_parent_image_spec(&p, end, pii); | |
4736 | if (ret) | |
4737 | return ret; | |
4738 | ||
4739 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4740 | "rbd", "parent_overlap_get", CEPH_OSD_FLAG_READ, | |
4741 | req_page, sizeof(u64), reply_page, &reply_len); | |
4742 | if (ret) | |
4743 | return ret; | |
4744 | ||
4745 | p = page_address(reply_page); | |
4746 | end = p + reply_len; | |
4747 | ceph_decode_8_safe(&p, end, pii->has_overlap, e_inval); | |
4748 | if (pii->has_overlap) | |
4749 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); | |
4750 | ||
4751 | return 0; | |
4752 | ||
4753 | e_inval: | |
4754 | return -EINVAL; | |
4755 | } | |
4756 | ||
eb3b2d6b ID |
4757 | /* |
4758 | * The caller is responsible for @pii. | |
4759 | */ | |
4760 | static int __get_parent_info_legacy(struct rbd_device *rbd_dev, | |
4761 | struct page *req_page, | |
4762 | struct page *reply_page, | |
4763 | struct parent_image_info *pii) | |
4764 | { | |
4765 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
4766 | size_t reply_len = PAGE_SIZE; | |
4767 | void *p, *end; | |
4768 | int ret; | |
4769 | ||
4770 | ret = ceph_osdc_call(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
4771 | "rbd", "get_parent", CEPH_OSD_FLAG_READ, | |
4772 | req_page, sizeof(u64), reply_page, &reply_len); | |
4773 | if (ret) | |
4774 | return ret; | |
4775 | ||
4776 | p = page_address(reply_page); | |
4777 | end = p + reply_len; | |
4778 | ceph_decode_64_safe(&p, end, pii->pool_id, e_inval); | |
4779 | pii->image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); | |
4780 | if (IS_ERR(pii->image_id)) { | |
4781 | ret = PTR_ERR(pii->image_id); | |
4782 | pii->image_id = NULL; | |
4783 | return ret; | |
4784 | } | |
4785 | ceph_decode_64_safe(&p, end, pii->snap_id, e_inval); | |
e92c0eaf | 4786 | pii->has_overlap = true; |
eb3b2d6b ID |
4787 | ceph_decode_64_safe(&p, end, pii->overlap, e_inval); |
4788 | ||
4789 | return 0; | |
4790 | ||
4791 | e_inval: | |
4792 | return -EINVAL; | |
4793 | } | |
4794 | ||
4795 | static int get_parent_info(struct rbd_device *rbd_dev, | |
4796 | struct parent_image_info *pii) | |
4797 | { | |
4798 | struct page *req_page, *reply_page; | |
4799 | void *p; | |
4800 | int ret; | |
4801 | ||
4802 | req_page = alloc_page(GFP_KERNEL); | |
4803 | if (!req_page) | |
4804 | return -ENOMEM; | |
4805 | ||
4806 | reply_page = alloc_page(GFP_KERNEL); | |
4807 | if (!reply_page) { | |
4808 | __free_page(req_page); | |
4809 | return -ENOMEM; | |
4810 | } | |
4811 | ||
4812 | p = page_address(req_page); | |
4813 | ceph_encode_64(&p, rbd_dev->spec->snap_id); | |
e92c0eaf ID |
4814 | ret = __get_parent_info(rbd_dev, req_page, reply_page, pii); |
4815 | if (ret > 0) | |
4816 | ret = __get_parent_info_legacy(rbd_dev, req_page, reply_page, | |
4817 | pii); | |
eb3b2d6b ID |
4818 | |
4819 | __free_page(req_page); | |
4820 | __free_page(reply_page); | |
4821 | return ret; | |
4822 | } | |
4823 | ||
86b00e0d AE |
4824 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4825 | { | |
4826 | struct rbd_spec *parent_spec; | |
eb3b2d6b | 4827 | struct parent_image_info pii = { 0 }; |
86b00e0d AE |
4828 | int ret; |
4829 | ||
4830 | parent_spec = rbd_spec_alloc(); | |
4831 | if (!parent_spec) | |
4832 | return -ENOMEM; | |
4833 | ||
eb3b2d6b ID |
4834 | ret = get_parent_info(rbd_dev, &pii); |
4835 | if (ret) | |
86b00e0d | 4836 | goto out_err; |
86b00e0d | 4837 | |
e92c0eaf ID |
4838 | dout("%s pool_id %llu pool_ns %s image_id %s snap_id %llu has_overlap %d overlap %llu\n", |
4839 | __func__, pii.pool_id, pii.pool_ns, pii.image_id, pii.snap_id, | |
4840 | pii.has_overlap, pii.overlap); | |
86b00e0d | 4841 | |
e92c0eaf | 4842 | if (pii.pool_id == CEPH_NOPOOL || !pii.has_overlap) { |
392a9dad AE |
4843 | /* |
4844 | * Either the parent never existed, or we have | |
4845 | * record of it but the image got flattened so it no | |
4846 | * longer has a parent. When the parent of a | |
4847 | * layered image disappears we immediately set the | |
4848 | * overlap to 0. The effect of this is that all new | |
4849 | * requests will be treated as if the image had no | |
4850 | * parent. | |
e92c0eaf ID |
4851 | * |
4852 | * If !pii.has_overlap, the parent image spec is not | |
4853 | * applicable. It's there to avoid duplication in each | |
4854 | * snapshot record. | |
392a9dad AE |
4855 | */ |
4856 | if (rbd_dev->parent_overlap) { | |
4857 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4858 | rbd_dev_parent_put(rbd_dev); |
4859 | pr_info("%s: clone image has been flattened\n", | |
4860 | rbd_dev->disk->disk_name); | |
4861 | } | |
4862 | ||
86b00e0d | 4863 | goto out; /* No parent? No problem. */ |
392a9dad | 4864 | } |
86b00e0d | 4865 | |
0903e875 AE |
4866 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4867 | ||
4868 | ret = -EIO; | |
eb3b2d6b | 4869 | if (pii.pool_id > (u64)U32_MAX) { |
9584d508 | 4870 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
eb3b2d6b | 4871 | (unsigned long long)pii.pool_id, U32_MAX); |
86b00e0d AE |
4872 | goto out_err; |
4873 | } | |
86b00e0d | 4874 | |
3b5cf2a2 AE |
4875 | /* |
4876 | * The parent won't change (except when the clone is | |
4877 | * flattened, already handled that). So we only need to | |
4878 | * record the parent spec we have not already done so. | |
4879 | */ | |
4880 | if (!rbd_dev->parent_spec) { | |
eb3b2d6b | 4881 | parent_spec->pool_id = pii.pool_id; |
e92c0eaf ID |
4882 | if (pii.pool_ns && *pii.pool_ns) { |
4883 | parent_spec->pool_ns = pii.pool_ns; | |
4884 | pii.pool_ns = NULL; | |
4885 | } | |
eb3b2d6b ID |
4886 | parent_spec->image_id = pii.image_id; |
4887 | pii.image_id = NULL; | |
4888 | parent_spec->snap_id = pii.snap_id; | |
b26c047b | 4889 | |
70cf49cf AE |
4890 | rbd_dev->parent_spec = parent_spec; |
4891 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3b5cf2a2 AE |
4892 | } |
4893 | ||
4894 | /* | |
cf32bd9c ID |
4895 | * We always update the parent overlap. If it's zero we issue |
4896 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4897 | */ |
eb3b2d6b | 4898 | if (!pii.overlap) { |
3b5cf2a2 | 4899 | if (parent_spec) { |
cf32bd9c ID |
4900 | /* refresh, careful to warn just once */ |
4901 | if (rbd_dev->parent_overlap) | |
4902 | rbd_warn(rbd_dev, | |
4903 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4904 | } else { |
cf32bd9c ID |
4905 | /* initial probe */ |
4906 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4907 | } |
70cf49cf | 4908 | } |
eb3b2d6b | 4909 | rbd_dev->parent_overlap = pii.overlap; |
cf32bd9c | 4910 | |
86b00e0d AE |
4911 | out: |
4912 | ret = 0; | |
4913 | out_err: | |
e92c0eaf | 4914 | kfree(pii.pool_ns); |
eb3b2d6b | 4915 | kfree(pii.image_id); |
86b00e0d | 4916 | rbd_spec_put(parent_spec); |
86b00e0d AE |
4917 | return ret; |
4918 | } | |
4919 | ||
cc070d59 AE |
4920 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4921 | { | |
4922 | struct { | |
4923 | __le64 stripe_unit; | |
4924 | __le64 stripe_count; | |
4925 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4926 | size_t size = sizeof (striping_info_buf); | |
4927 | void *p; | |
cc070d59 AE |
4928 | int ret; |
4929 | ||
ecd4a68a ID |
4930 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4931 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
4932 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
4933 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4934 | if (ret < 0) | |
4935 | return ret; | |
4936 | if (ret < size) | |
4937 | return -ERANGE; | |
4938 | ||
cc070d59 | 4939 | p = &striping_info_buf; |
b1331852 ID |
4940 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
4941 | rbd_dev->header.stripe_count = ceph_decode_64(&p); | |
cc070d59 AE |
4942 | return 0; |
4943 | } | |
4944 | ||
7e97332e ID |
4945 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
4946 | { | |
4947 | __le64 data_pool_id; | |
4948 | int ret; | |
4949 | ||
4950 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
4951 | &rbd_dev->header_oloc, "get_data_pool", | |
4952 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
4953 | if (ret < 0) | |
4954 | return ret; | |
4955 | if (ret < sizeof(data_pool_id)) | |
4956 | return -EBADMSG; | |
4957 | ||
4958 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
4959 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
4960 | return 0; | |
4961 | } | |
4962 | ||
9e15b77d AE |
4963 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4964 | { | |
ecd4a68a | 4965 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
4966 | size_t image_id_size; |
4967 | char *image_id; | |
4968 | void *p; | |
4969 | void *end; | |
4970 | size_t size; | |
4971 | void *reply_buf = NULL; | |
4972 | size_t len = 0; | |
4973 | char *image_name = NULL; | |
4974 | int ret; | |
4975 | ||
4976 | rbd_assert(!rbd_dev->spec->image_name); | |
4977 | ||
69e7a02f AE |
4978 | len = strlen(rbd_dev->spec->image_id); |
4979 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4980 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4981 | if (!image_id) | |
4982 | return NULL; | |
4983 | ||
4984 | p = image_id; | |
4157976b | 4985 | end = image_id + image_id_size; |
57385b51 | 4986 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4987 | |
4988 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4989 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4990 | if (!reply_buf) | |
4991 | goto out; | |
4992 | ||
ecd4a68a ID |
4993 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
4994 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
4995 | "dir_get_name", image_id, image_id_size, | |
4996 | reply_buf, size); | |
9e15b77d AE |
4997 | if (ret < 0) |
4998 | goto out; | |
4999 | p = reply_buf; | |
f40eb349 AE |
5000 | end = reply_buf + ret; |
5001 | ||
9e15b77d AE |
5002 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
5003 | if (IS_ERR(image_name)) | |
5004 | image_name = NULL; | |
5005 | else | |
5006 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
5007 | out: | |
5008 | kfree(reply_buf); | |
5009 | kfree(image_id); | |
5010 | ||
5011 | return image_name; | |
5012 | } | |
5013 | ||
2ad3d716 AE |
5014 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
5015 | { | |
5016 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5017 | const char *snap_name; | |
5018 | u32 which = 0; | |
5019 | ||
5020 | /* Skip over names until we find the one we are looking for */ | |
5021 | ||
5022 | snap_name = rbd_dev->header.snap_names; | |
5023 | while (which < snapc->num_snaps) { | |
5024 | if (!strcmp(name, snap_name)) | |
5025 | return snapc->snaps[which]; | |
5026 | snap_name += strlen(snap_name) + 1; | |
5027 | which++; | |
5028 | } | |
5029 | return CEPH_NOSNAP; | |
5030 | } | |
5031 | ||
5032 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5033 | { | |
5034 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
5035 | u32 which; | |
5036 | bool found = false; | |
5037 | u64 snap_id; | |
5038 | ||
5039 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
5040 | const char *snap_name; | |
5041 | ||
5042 | snap_id = snapc->snaps[which]; | |
5043 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
5044 | if (IS_ERR(snap_name)) { |
5045 | /* ignore no-longer existing snapshots */ | |
5046 | if (PTR_ERR(snap_name) == -ENOENT) | |
5047 | continue; | |
5048 | else | |
5049 | break; | |
5050 | } | |
2ad3d716 AE |
5051 | found = !strcmp(name, snap_name); |
5052 | kfree(snap_name); | |
5053 | } | |
5054 | return found ? snap_id : CEPH_NOSNAP; | |
5055 | } | |
5056 | ||
5057 | /* | |
5058 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
5059 | * no snapshot by that name is found, or if an error occurs. | |
5060 | */ | |
5061 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
5062 | { | |
5063 | if (rbd_dev->image_format == 1) | |
5064 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
5065 | ||
5066 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
5067 | } | |
5068 | ||
9e15b77d | 5069 | /* |
04077599 ID |
5070 | * An image being mapped will have everything but the snap id. |
5071 | */ | |
5072 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
5073 | { | |
5074 | struct rbd_spec *spec = rbd_dev->spec; | |
5075 | ||
5076 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
5077 | rbd_assert(spec->image_id && spec->image_name); | |
5078 | rbd_assert(spec->snap_name); | |
5079 | ||
5080 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
5081 | u64 snap_id; | |
5082 | ||
5083 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
5084 | if (snap_id == CEPH_NOSNAP) | |
5085 | return -ENOENT; | |
5086 | ||
5087 | spec->snap_id = snap_id; | |
5088 | } else { | |
5089 | spec->snap_id = CEPH_NOSNAP; | |
5090 | } | |
5091 | ||
5092 | return 0; | |
5093 | } | |
5094 | ||
5095 | /* | |
5096 | * A parent image will have all ids but none of the names. | |
e1d4213f | 5097 | * |
04077599 ID |
5098 | * All names in an rbd spec are dynamically allocated. It's OK if we |
5099 | * can't figure out the name for an image id. | |
9e15b77d | 5100 | */ |
04077599 | 5101 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 5102 | { |
2e9f7f1c AE |
5103 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
5104 | struct rbd_spec *spec = rbd_dev->spec; | |
5105 | const char *pool_name; | |
5106 | const char *image_name; | |
5107 | const char *snap_name; | |
9e15b77d AE |
5108 | int ret; |
5109 | ||
04077599 ID |
5110 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
5111 | rbd_assert(spec->image_id); | |
5112 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 5113 | |
2e9f7f1c | 5114 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 5115 | |
2e9f7f1c AE |
5116 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
5117 | if (!pool_name) { | |
5118 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
5119 | return -EIO; |
5120 | } | |
2e9f7f1c AE |
5121 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
5122 | if (!pool_name) | |
9e15b77d AE |
5123 | return -ENOMEM; |
5124 | ||
5125 | /* Fetch the image name; tolerate failure here */ | |
5126 | ||
2e9f7f1c AE |
5127 | image_name = rbd_dev_image_name(rbd_dev); |
5128 | if (!image_name) | |
06ecc6cb | 5129 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 5130 | |
04077599 | 5131 | /* Fetch the snapshot name */ |
9e15b77d | 5132 | |
2e9f7f1c | 5133 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
5134 | if (IS_ERR(snap_name)) { |
5135 | ret = PTR_ERR(snap_name); | |
9e15b77d | 5136 | goto out_err; |
2e9f7f1c AE |
5137 | } |
5138 | ||
5139 | spec->pool_name = pool_name; | |
5140 | spec->image_name = image_name; | |
5141 | spec->snap_name = snap_name; | |
9e15b77d AE |
5142 | |
5143 | return 0; | |
04077599 | 5144 | |
9e15b77d | 5145 | out_err: |
2e9f7f1c AE |
5146 | kfree(image_name); |
5147 | kfree(pool_name); | |
9e15b77d AE |
5148 | return ret; |
5149 | } | |
5150 | ||
cc4a38bd | 5151 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
5152 | { |
5153 | size_t size; | |
5154 | int ret; | |
5155 | void *reply_buf; | |
5156 | void *p; | |
5157 | void *end; | |
5158 | u64 seq; | |
5159 | u32 snap_count; | |
5160 | struct ceph_snap_context *snapc; | |
5161 | u32 i; | |
5162 | ||
5163 | /* | |
5164 | * We'll need room for the seq value (maximum snapshot id), | |
5165 | * snapshot count, and array of that many snapshot ids. | |
5166 | * For now we have a fixed upper limit on the number we're | |
5167 | * prepared to receive. | |
5168 | */ | |
5169 | size = sizeof (__le64) + sizeof (__le32) + | |
5170 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
5171 | reply_buf = kzalloc(size, GFP_KERNEL); | |
5172 | if (!reply_buf) | |
5173 | return -ENOMEM; | |
5174 | ||
ecd4a68a ID |
5175 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5176 | &rbd_dev->header_oloc, "get_snapcontext", | |
5177 | NULL, 0, reply_buf, size); | |
36be9a76 | 5178 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
5179 | if (ret < 0) |
5180 | goto out; | |
5181 | ||
35d489f9 | 5182 | p = reply_buf; |
57385b51 AE |
5183 | end = reply_buf + ret; |
5184 | ret = -ERANGE; | |
35d489f9 AE |
5185 | ceph_decode_64_safe(&p, end, seq, out); |
5186 | ceph_decode_32_safe(&p, end, snap_count, out); | |
5187 | ||
5188 | /* | |
5189 | * Make sure the reported number of snapshot ids wouldn't go | |
5190 | * beyond the end of our buffer. But before checking that, | |
5191 | * make sure the computed size of the snapshot context we | |
5192 | * allocate is representable in a size_t. | |
5193 | */ | |
5194 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
5195 | / sizeof (u64)) { | |
5196 | ret = -EINVAL; | |
5197 | goto out; | |
5198 | } | |
5199 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
5200 | goto out; | |
468521c1 | 5201 | ret = 0; |
35d489f9 | 5202 | |
812164f8 | 5203 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
5204 | if (!snapc) { |
5205 | ret = -ENOMEM; | |
5206 | goto out; | |
5207 | } | |
35d489f9 | 5208 | snapc->seq = seq; |
35d489f9 AE |
5209 | for (i = 0; i < snap_count; i++) |
5210 | snapc->snaps[i] = ceph_decode_64(&p); | |
5211 | ||
49ece554 | 5212 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
5213 | rbd_dev->header.snapc = snapc; |
5214 | ||
5215 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 5216 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
5217 | out: |
5218 | kfree(reply_buf); | |
5219 | ||
57385b51 | 5220 | return ret; |
35d489f9 AE |
5221 | } |
5222 | ||
54cac61f AE |
5223 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
5224 | u64 snap_id) | |
b8b1e2db AE |
5225 | { |
5226 | size_t size; | |
5227 | void *reply_buf; | |
54cac61f | 5228 | __le64 snapid; |
b8b1e2db AE |
5229 | int ret; |
5230 | void *p; | |
5231 | void *end; | |
b8b1e2db AE |
5232 | char *snap_name; |
5233 | ||
5234 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
5235 | reply_buf = kmalloc(size, GFP_KERNEL); | |
5236 | if (!reply_buf) | |
5237 | return ERR_PTR(-ENOMEM); | |
5238 | ||
54cac61f | 5239 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
5240 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
5241 | &rbd_dev->header_oloc, "get_snapshot_name", | |
5242 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 5243 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
5244 | if (ret < 0) { |
5245 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 5246 | goto out; |
f40eb349 | 5247 | } |
b8b1e2db AE |
5248 | |
5249 | p = reply_buf; | |
f40eb349 | 5250 | end = reply_buf + ret; |
e5c35534 | 5251 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 5252 | if (IS_ERR(snap_name)) |
b8b1e2db | 5253 | goto out; |
b8b1e2db | 5254 | |
f40eb349 | 5255 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 5256 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
5257 | out: |
5258 | kfree(reply_buf); | |
5259 | ||
f40eb349 | 5260 | return snap_name; |
b8b1e2db AE |
5261 | } |
5262 | ||
2df3fac7 | 5263 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 5264 | { |
2df3fac7 | 5265 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 5266 | int ret; |
117973fb | 5267 | |
1617e40c JD |
5268 | ret = rbd_dev_v2_image_size(rbd_dev); |
5269 | if (ret) | |
cfbf6377 | 5270 | return ret; |
1617e40c | 5271 | |
2df3fac7 AE |
5272 | if (first_time) { |
5273 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
5274 | if (ret) | |
cfbf6377 | 5275 | return ret; |
2df3fac7 AE |
5276 | } |
5277 | ||
cc4a38bd | 5278 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
5279 | if (ret && first_time) { |
5280 | kfree(rbd_dev->header.object_prefix); | |
5281 | rbd_dev->header.object_prefix = NULL; | |
5282 | } | |
117973fb AE |
5283 | |
5284 | return ret; | |
5285 | } | |
5286 | ||
a720ae09 ID |
5287 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
5288 | { | |
5289 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5290 | ||
5291 | if (rbd_dev->image_format == 1) | |
5292 | return rbd_dev_v1_header_info(rbd_dev); | |
5293 | ||
5294 | return rbd_dev_v2_header_info(rbd_dev); | |
5295 | } | |
5296 | ||
e28fff26 AE |
5297 | /* |
5298 | * Skips over white space at *buf, and updates *buf to point to the | |
5299 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
5300 | * the token (string of non-white space characters) found. Note |
5301 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
5302 | */ |
5303 | static inline size_t next_token(const char **buf) | |
5304 | { | |
5305 | /* | |
5306 | * These are the characters that produce nonzero for | |
5307 | * isspace() in the "C" and "POSIX" locales. | |
5308 | */ | |
5309 | const char *spaces = " \f\n\r\t\v"; | |
5310 | ||
5311 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5312 | ||
5313 | return strcspn(*buf, spaces); /* Return token length */ | |
5314 | } | |
5315 | ||
ea3352f4 AE |
5316 | /* |
5317 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5318 | * enough to hold a copy of it, and copies the token into the new | |
5319 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5320 | * that a duplicate buffer is created even for a zero-length token. | |
5321 | * | |
5322 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5323 | * pointer if memory for the duplicate was not available. If | |
5324 | * the lenp argument is a non-null pointer, the length of the token | |
5325 | * (not including the '\0') is returned in *lenp. | |
5326 | * | |
5327 | * If successful, the *buf pointer will be updated to point beyond | |
5328 | * the end of the found token. | |
5329 | * | |
5330 | * Note: uses GFP_KERNEL for allocation. | |
5331 | */ | |
5332 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5333 | { | |
5334 | char *dup; | |
5335 | size_t len; | |
5336 | ||
5337 | len = next_token(buf); | |
4caf35f9 | 5338 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5339 | if (!dup) |
5340 | return NULL; | |
ea3352f4 AE |
5341 | *(dup + len) = '\0'; |
5342 | *buf += len; | |
5343 | ||
5344 | if (lenp) | |
5345 | *lenp = len; | |
5346 | ||
5347 | return dup; | |
5348 | } | |
5349 | ||
a725f65e | 5350 | /* |
859c31df AE |
5351 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5352 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5353 | * and the data written is passed here via a NUL-terminated buffer. | |
5354 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5355 | * |
859c31df AE |
5356 | * The information extracted from these options is recorded in |
5357 | * the other parameters which return dynamically-allocated | |
5358 | * structures: | |
5359 | * ceph_opts | |
5360 | * The address of a pointer that will refer to a ceph options | |
5361 | * structure. Caller must release the returned pointer using | |
5362 | * ceph_destroy_options() when it is no longer needed. | |
5363 | * rbd_opts | |
5364 | * Address of an rbd options pointer. Fully initialized by | |
5365 | * this function; caller must release with kfree(). | |
5366 | * spec | |
5367 | * Address of an rbd image specification pointer. Fully | |
5368 | * initialized by this function based on parsed options. | |
5369 | * Caller must release with rbd_spec_put(). | |
5370 | * | |
5371 | * The options passed take this form: | |
5372 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5373 | * where: | |
5374 | * <mon_addrs> | |
5375 | * A comma-separated list of one or more monitor addresses. | |
5376 | * A monitor address is an ip address, optionally followed | |
5377 | * by a port number (separated by a colon). | |
5378 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5379 | * <options> | |
5380 | * A comma-separated list of ceph and/or rbd options. | |
5381 | * <pool_name> | |
5382 | * The name of the rados pool containing the rbd image. | |
5383 | * <image_name> | |
5384 | * The name of the image in that pool to map. | |
5385 | * <snap_id> | |
5386 | * An optional snapshot id. If provided, the mapping will | |
5387 | * present data from the image at the time that snapshot was | |
5388 | * created. The image head is used if no snapshot id is | |
5389 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5390 | */ |
859c31df | 5391 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5392 | struct ceph_options **ceph_opts, |
859c31df AE |
5393 | struct rbd_options **opts, |
5394 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5395 | { |
d22f76e7 | 5396 | size_t len; |
859c31df | 5397 | char *options; |
0ddebc0c | 5398 | const char *mon_addrs; |
ecb4dc22 | 5399 | char *snap_name; |
0ddebc0c | 5400 | size_t mon_addrs_size; |
c300156b | 5401 | struct parse_rbd_opts_ctx pctx = { 0 }; |
859c31df | 5402 | struct ceph_options *copts; |
dc79b113 | 5403 | int ret; |
e28fff26 AE |
5404 | |
5405 | /* The first four tokens are required */ | |
5406 | ||
7ef3214a | 5407 | len = next_token(&buf); |
4fb5d671 AE |
5408 | if (!len) { |
5409 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5410 | return -EINVAL; | |
5411 | } | |
0ddebc0c | 5412 | mon_addrs = buf; |
f28e565a | 5413 | mon_addrs_size = len + 1; |
7ef3214a | 5414 | buf += len; |
a725f65e | 5415 | |
dc79b113 | 5416 | ret = -EINVAL; |
f28e565a AE |
5417 | options = dup_token(&buf, NULL); |
5418 | if (!options) | |
dc79b113 | 5419 | return -ENOMEM; |
4fb5d671 AE |
5420 | if (!*options) { |
5421 | rbd_warn(NULL, "no options provided"); | |
5422 | goto out_err; | |
5423 | } | |
e28fff26 | 5424 | |
c300156b ID |
5425 | pctx.spec = rbd_spec_alloc(); |
5426 | if (!pctx.spec) | |
f28e565a | 5427 | goto out_mem; |
859c31df | 5428 | |
c300156b ID |
5429 | pctx.spec->pool_name = dup_token(&buf, NULL); |
5430 | if (!pctx.spec->pool_name) | |
859c31df | 5431 | goto out_mem; |
c300156b | 5432 | if (!*pctx.spec->pool_name) { |
4fb5d671 AE |
5433 | rbd_warn(NULL, "no pool name provided"); |
5434 | goto out_err; | |
5435 | } | |
e28fff26 | 5436 | |
c300156b ID |
5437 | pctx.spec->image_name = dup_token(&buf, NULL); |
5438 | if (!pctx.spec->image_name) | |
f28e565a | 5439 | goto out_mem; |
c300156b | 5440 | if (!*pctx.spec->image_name) { |
4fb5d671 AE |
5441 | rbd_warn(NULL, "no image name provided"); |
5442 | goto out_err; | |
5443 | } | |
d4b125e9 | 5444 | |
f28e565a AE |
5445 | /* |
5446 | * Snapshot name is optional; default is to use "-" | |
5447 | * (indicating the head/no snapshot). | |
5448 | */ | |
3feeb894 | 5449 | len = next_token(&buf); |
820a5f3e | 5450 | if (!len) { |
3feeb894 AE |
5451 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5452 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5453 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5454 | ret = -ENAMETOOLONG; |
f28e565a | 5455 | goto out_err; |
849b4260 | 5456 | } |
ecb4dc22 AE |
5457 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5458 | if (!snap_name) | |
f28e565a | 5459 | goto out_mem; |
ecb4dc22 | 5460 | *(snap_name + len) = '\0'; |
c300156b | 5461 | pctx.spec->snap_name = snap_name; |
e5c35534 | 5462 | |
0ddebc0c | 5463 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5464 | |
c300156b ID |
5465 | pctx.opts = kzalloc(sizeof(*pctx.opts), GFP_KERNEL); |
5466 | if (!pctx.opts) | |
4e9afeba AE |
5467 | goto out_mem; |
5468 | ||
c300156b ID |
5469 | pctx.opts->read_only = RBD_READ_ONLY_DEFAULT; |
5470 | pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; | |
0c93e1b7 | 5471 | pctx.opts->alloc_size = RBD_ALLOC_SIZE_DEFAULT; |
c300156b ID |
5472 | pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT; |
5473 | pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; | |
5474 | pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT; | |
5475 | pctx.opts->trim = RBD_TRIM_DEFAULT; | |
d22f76e7 | 5476 | |
859c31df | 5477 | copts = ceph_parse_options(options, mon_addrs, |
c300156b ID |
5478 | mon_addrs + mon_addrs_size - 1, |
5479 | parse_rbd_opts_token, &pctx); | |
859c31df AE |
5480 | if (IS_ERR(copts)) { |
5481 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5482 | goto out_err; |
5483 | } | |
859c31df AE |
5484 | kfree(options); |
5485 | ||
5486 | *ceph_opts = copts; | |
c300156b ID |
5487 | *opts = pctx.opts; |
5488 | *rbd_spec = pctx.spec; | |
0ddebc0c | 5489 | |
dc79b113 | 5490 | return 0; |
f28e565a | 5491 | out_mem: |
dc79b113 | 5492 | ret = -ENOMEM; |
d22f76e7 | 5493 | out_err: |
c300156b ID |
5494 | kfree(pctx.opts); |
5495 | rbd_spec_put(pctx.spec); | |
f28e565a | 5496 | kfree(options); |
d22f76e7 | 5497 | |
dc79b113 | 5498 | return ret; |
a725f65e AE |
5499 | } |
5500 | ||
e010dd0a ID |
5501 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5502 | { | |
5503 | down_write(&rbd_dev->lock_rwsem); | |
5504 | if (__rbd_is_lock_owner(rbd_dev)) | |
5505 | rbd_unlock(rbd_dev); | |
5506 | up_write(&rbd_dev->lock_rwsem); | |
5507 | } | |
5508 | ||
5509 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5510 | { | |
2f18d466 ID |
5511 | int ret; |
5512 | ||
e010dd0a ID |
5513 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
5514 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5515 | return -EINVAL; | |
5516 | } | |
5517 | ||
5518 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5519 | down_read(&rbd_dev->lock_rwsem); | |
2f18d466 | 5520 | ret = rbd_wait_state_locked(rbd_dev, true); |
e010dd0a | 5521 | up_read(&rbd_dev->lock_rwsem); |
2f18d466 | 5522 | if (ret) { |
e010dd0a ID |
5523 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); |
5524 | return -EROFS; | |
5525 | } | |
5526 | ||
5527 | return 0; | |
5528 | } | |
5529 | ||
589d30e0 AE |
5530 | /* |
5531 | * An rbd format 2 image has a unique identifier, distinct from the | |
5532 | * name given to it by the user. Internally, that identifier is | |
5533 | * what's used to specify the names of objects related to the image. | |
5534 | * | |
5535 | * A special "rbd id" object is used to map an rbd image name to its | |
5536 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5537 | * with the supplied name. | |
5538 | * | |
5539 | * This function will record the given rbd_dev's image_id field if | |
5540 | * it can be determined, and in that case will return 0. If any | |
5541 | * errors occur a negative errno will be returned and the rbd_dev's | |
5542 | * image_id field will be unchanged (and should be NULL). | |
5543 | */ | |
5544 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5545 | { | |
5546 | int ret; | |
5547 | size_t size; | |
ecd4a68a | 5548 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5549 | void *response; |
c0fba368 | 5550 | char *image_id; |
2f82ee54 | 5551 | |
2c0d0a10 AE |
5552 | /* |
5553 | * When probing a parent image, the image id is already | |
5554 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5555 | * need to fetch the image id again in this case. We |
5556 | * do still need to set the image format though. | |
2c0d0a10 | 5557 | */ |
c0fba368 AE |
5558 | if (rbd_dev->spec->image_id) { |
5559 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5560 | ||
2c0d0a10 | 5561 | return 0; |
c0fba368 | 5562 | } |
2c0d0a10 | 5563 | |
589d30e0 AE |
5564 | /* |
5565 | * First, see if the format 2 image id file exists, and if | |
5566 | * so, get the image's persistent id from it. | |
5567 | */ | |
ecd4a68a ID |
5568 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5569 | rbd_dev->spec->image_name); | |
5570 | if (ret) | |
5571 | return ret; | |
5572 | ||
5573 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5574 | |
5575 | /* Response will be an encoded string, which includes a length */ | |
5576 | ||
5577 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5578 | response = kzalloc(size, GFP_NOIO); | |
5579 | if (!response) { | |
5580 | ret = -ENOMEM; | |
5581 | goto out; | |
5582 | } | |
5583 | ||
c0fba368 AE |
5584 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5585 | ||
ecd4a68a ID |
5586 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5587 | "get_id", NULL, 0, | |
5588 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5589 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5590 | if (ret == -ENOENT) { |
5591 | image_id = kstrdup("", GFP_KERNEL); | |
5592 | ret = image_id ? 0 : -ENOMEM; | |
5593 | if (!ret) | |
5594 | rbd_dev->image_format = 1; | |
7dd440c9 | 5595 | } else if (ret >= 0) { |
c0fba368 AE |
5596 | void *p = response; |
5597 | ||
5598 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5599 | NULL, GFP_NOIO); |
461f758a | 5600 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5601 | if (!ret) |
5602 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5603 | } |
5604 | ||
5605 | if (!ret) { | |
5606 | rbd_dev->spec->image_id = image_id; | |
5607 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5608 | } |
5609 | out: | |
5610 | kfree(response); | |
ecd4a68a | 5611 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5612 | return ret; |
5613 | } | |
5614 | ||
3abef3b3 AE |
5615 | /* |
5616 | * Undo whatever state changes are made by v1 or v2 header info | |
5617 | * call. | |
5618 | */ | |
6fd48b3b AE |
5619 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5620 | { | |
5621 | struct rbd_image_header *header; | |
5622 | ||
e69b8d41 | 5623 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5624 | |
5625 | /* Free dynamic fields from the header, then zero it out */ | |
5626 | ||
5627 | header = &rbd_dev->header; | |
812164f8 | 5628 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5629 | kfree(header->snap_sizes); |
5630 | kfree(header->snap_names); | |
5631 | kfree(header->object_prefix); | |
5632 | memset(header, 0, sizeof (*header)); | |
5633 | } | |
5634 | ||
2df3fac7 | 5635 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5636 | { |
5637 | int ret; | |
a30b71b9 | 5638 | |
1e130199 | 5639 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5640 | if (ret) |
b1b5402a AE |
5641 | goto out_err; |
5642 | ||
2df3fac7 AE |
5643 | /* |
5644 | * Get the and check features for the image. Currently the | |
5645 | * features are assumed to never change. | |
5646 | */ | |
b1b5402a | 5647 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5648 | if (ret) |
9d475de5 | 5649 | goto out_err; |
35d489f9 | 5650 | |
cc070d59 AE |
5651 | /* If the image supports fancy striping, get its parameters */ |
5652 | ||
5653 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5654 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5655 | if (ret < 0) | |
5656 | goto out_err; | |
5657 | } | |
a30b71b9 | 5658 | |
7e97332e ID |
5659 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5660 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5661 | if (ret) | |
5662 | goto out_err; | |
5663 | } | |
5664 | ||
263423f8 | 5665 | rbd_init_layout(rbd_dev); |
35152979 | 5666 | return 0; |
263423f8 | 5667 | |
9d475de5 | 5668 | out_err: |
642a2537 | 5669 | rbd_dev->header.features = 0; |
1e130199 AE |
5670 | kfree(rbd_dev->header.object_prefix); |
5671 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5672 | return ret; |
a30b71b9 AE |
5673 | } |
5674 | ||
6d69bb53 ID |
5675 | /* |
5676 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5677 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5678 | * length of the already discovered part of the parent chain. | |
5679 | */ | |
5680 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5681 | { |
2f82ee54 | 5682 | struct rbd_device *parent = NULL; |
124afba2 AE |
5683 | int ret; |
5684 | ||
5685 | if (!rbd_dev->parent_spec) | |
5686 | return 0; | |
124afba2 | 5687 | |
6d69bb53 ID |
5688 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5689 | pr_info("parent chain is too long (%d)\n", depth); | |
5690 | ret = -EINVAL; | |
5691 | goto out_err; | |
5692 | } | |
5693 | ||
1643dfa4 | 5694 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5695 | if (!parent) { |
5696 | ret = -ENOMEM; | |
124afba2 | 5697 | goto out_err; |
1f2c6651 ID |
5698 | } |
5699 | ||
5700 | /* | |
5701 | * Images related by parent/child relationships always share | |
5702 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5703 | */ | |
5704 | __rbd_get_client(rbd_dev->rbd_client); | |
5705 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5706 | |
6d69bb53 | 5707 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5708 | if (ret < 0) |
5709 | goto out_err; | |
1f2c6651 | 5710 | |
124afba2 | 5711 | rbd_dev->parent = parent; |
a2acd00e | 5712 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5713 | return 0; |
1f2c6651 | 5714 | |
124afba2 | 5715 | out_err: |
1f2c6651 | 5716 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5717 | rbd_dev_destroy(parent); |
124afba2 AE |
5718 | return ret; |
5719 | } | |
5720 | ||
5769ed0c ID |
5721 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5722 | { | |
5723 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5724 | rbd_dev_mapping_clear(rbd_dev); | |
5725 | rbd_free_disk(rbd_dev); | |
5726 | if (!single_major) | |
5727 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5728 | } | |
5729 | ||
811c6688 ID |
5730 | /* |
5731 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5732 | * upon return. | |
5733 | */ | |
200a6a8b | 5734 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5735 | { |
83a06263 | 5736 | int ret; |
d1cf5788 | 5737 | |
9b60e70b | 5738 | /* Record our major and minor device numbers. */ |
83a06263 | 5739 | |
9b60e70b ID |
5740 | if (!single_major) { |
5741 | ret = register_blkdev(0, rbd_dev->name); | |
5742 | if (ret < 0) | |
1643dfa4 | 5743 | goto err_out_unlock; |
9b60e70b ID |
5744 | |
5745 | rbd_dev->major = ret; | |
5746 | rbd_dev->minor = 0; | |
5747 | } else { | |
5748 | rbd_dev->major = rbd_major; | |
5749 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5750 | } | |
83a06263 AE |
5751 | |
5752 | /* Set up the blkdev mapping. */ | |
5753 | ||
5754 | ret = rbd_init_disk(rbd_dev); | |
5755 | if (ret) | |
5756 | goto err_out_blkdev; | |
5757 | ||
f35a4dee | 5758 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5759 | if (ret) |
5760 | goto err_out_disk; | |
bc1ecc65 | 5761 | |
f35a4dee | 5762 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5763 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5764 | |
5769ed0c | 5765 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5766 | if (ret) |
f5ee37bd | 5767 | goto err_out_mapping; |
83a06263 | 5768 | |
129b79d4 | 5769 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5770 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5771 | return 0; |
2f82ee54 | 5772 | |
f35a4dee AE |
5773 | err_out_mapping: |
5774 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5775 | err_out_disk: |
5776 | rbd_free_disk(rbd_dev); | |
5777 | err_out_blkdev: | |
9b60e70b ID |
5778 | if (!single_major) |
5779 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5780 | err_out_unlock: |
5781 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5782 | return ret; |
5783 | } | |
5784 | ||
332bb12d AE |
5785 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5786 | { | |
5787 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5788 | int ret; |
332bb12d AE |
5789 | |
5790 | /* Record the header object name for this rbd image. */ | |
5791 | ||
5792 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5793 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5794 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5795 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5796 | else |
c41d13a3 ID |
5797 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5798 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5799 | |
c41d13a3 | 5800 | return ret; |
332bb12d AE |
5801 | } |
5802 | ||
200a6a8b AE |
5803 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5804 | { | |
6fd48b3b | 5805 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
5806 | if (rbd_dev->opts) |
5807 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
5808 | rbd_dev->image_format = 0; |
5809 | kfree(rbd_dev->spec->image_id); | |
5810 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
5811 | } |
5812 | ||
a30b71b9 AE |
5813 | /* |
5814 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5815 | * device. If this image is the one being mapped (i.e., not a |
5816 | * parent), initiate a watch on its header object before using that | |
5817 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5818 | */ |
6d69bb53 | 5819 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5820 | { |
5821 | int ret; | |
5822 | ||
5823 | /* | |
3abef3b3 AE |
5824 | * Get the id from the image id object. Unless there's an |
5825 | * error, rbd_dev->spec->image_id will be filled in with | |
5826 | * a dynamically-allocated string, and rbd_dev->image_format | |
5827 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5828 | */ |
5829 | ret = rbd_dev_image_id(rbd_dev); | |
5830 | if (ret) | |
c0fba368 | 5831 | return ret; |
c0fba368 | 5832 | |
332bb12d AE |
5833 | ret = rbd_dev_header_name(rbd_dev); |
5834 | if (ret) | |
5835 | goto err_out_format; | |
5836 | ||
6d69bb53 | 5837 | if (!depth) { |
99d16943 | 5838 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5839 | if (ret) { |
5840 | if (ret == -ENOENT) | |
b26c047b | 5841 | pr_info("image %s/%s%s%s does not exist\n", |
1fe48023 | 5842 | rbd_dev->spec->pool_name, |
b26c047b ID |
5843 | rbd_dev->spec->pool_ns ?: "", |
5844 | rbd_dev->spec->pool_ns ? "/" : "", | |
1fe48023 | 5845 | rbd_dev->spec->image_name); |
c41d13a3 | 5846 | goto err_out_format; |
1fe48023 | 5847 | } |
1f3ef788 | 5848 | } |
b644de2b | 5849 | |
a720ae09 | 5850 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5851 | if (ret) |
b644de2b | 5852 | goto err_out_watch; |
83a06263 | 5853 | |
04077599 ID |
5854 | /* |
5855 | * If this image is the one being mapped, we have pool name and | |
5856 | * id, image name and id, and snap name - need to fill snap id. | |
5857 | * Otherwise this is a parent image, identified by pool, image | |
5858 | * and snap ids - need to fill in names for those ids. | |
5859 | */ | |
6d69bb53 | 5860 | if (!depth) |
04077599 ID |
5861 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5862 | else | |
5863 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5864 | if (ret) { |
5865 | if (ret == -ENOENT) | |
b26c047b | 5866 | pr_info("snap %s/%s%s%s@%s does not exist\n", |
1fe48023 | 5867 | rbd_dev->spec->pool_name, |
b26c047b ID |
5868 | rbd_dev->spec->pool_ns ?: "", |
5869 | rbd_dev->spec->pool_ns ? "/" : "", | |
1fe48023 ID |
5870 | rbd_dev->spec->image_name, |
5871 | rbd_dev->spec->snap_name); | |
33dca39f | 5872 | goto err_out_probe; |
1fe48023 | 5873 | } |
9bb81c9b | 5874 | |
e8f59b59 ID |
5875 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5876 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5877 | if (ret) | |
5878 | goto err_out_probe; | |
e8f59b59 ID |
5879 | } |
5880 | ||
6d69bb53 | 5881 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5882 | if (ret) |
5883 | goto err_out_probe; | |
5884 | ||
5885 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5886 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5887 | return 0; |
e8f59b59 | 5888 | |
6fd48b3b AE |
5889 | err_out_probe: |
5890 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5891 | err_out_watch: |
6d69bb53 | 5892 | if (!depth) |
99d16943 | 5893 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5894 | err_out_format: |
5895 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5896 | kfree(rbd_dev->spec->image_id); |
5897 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5898 | return ret; |
5899 | } | |
5900 | ||
9b60e70b ID |
5901 | static ssize_t do_rbd_add(struct bus_type *bus, |
5902 | const char *buf, | |
5903 | size_t count) | |
602adf40 | 5904 | { |
cb8627c7 | 5905 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5906 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5907 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5908 | struct rbd_spec *spec = NULL; |
9d3997fd | 5909 | struct rbd_client *rbdc; |
b51c83c2 | 5910 | int rc; |
602adf40 YS |
5911 | |
5912 | if (!try_module_get(THIS_MODULE)) | |
5913 | return -ENODEV; | |
5914 | ||
602adf40 | 5915 | /* parse add command */ |
859c31df | 5916 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5917 | if (rc < 0) |
dd5ac32d | 5918 | goto out; |
78cea76e | 5919 | |
9d3997fd AE |
5920 | rbdc = rbd_get_client(ceph_opts); |
5921 | if (IS_ERR(rbdc)) { | |
5922 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5923 | goto err_out_args; |
9d3997fd | 5924 | } |
602adf40 | 5925 | |
602adf40 | 5926 | /* pick the pool */ |
dd435855 | 5927 | rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name); |
1fe48023 ID |
5928 | if (rc < 0) { |
5929 | if (rc == -ENOENT) | |
5930 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5931 | goto err_out_client; |
1fe48023 | 5932 | } |
c0cd10db | 5933 | spec->pool_id = (u64)rc; |
859c31df | 5934 | |
d147543d | 5935 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5936 | if (!rbd_dev) { |
5937 | rc = -ENOMEM; | |
bd4ba655 | 5938 | goto err_out_client; |
b51c83c2 | 5939 | } |
c53d5893 AE |
5940 | rbdc = NULL; /* rbd_dev now owns this */ |
5941 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5942 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5943 | |
0d6d1e9c MC |
5944 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
5945 | if (!rbd_dev->config_info) { | |
5946 | rc = -ENOMEM; | |
5947 | goto err_out_rbd_dev; | |
5948 | } | |
5949 | ||
811c6688 | 5950 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5951 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
5952 | if (rc < 0) { |
5953 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 5954 | goto err_out_rbd_dev; |
0d6d1e9c | 5955 | } |
05fd6f6f | 5956 | |
7ce4eef7 | 5957 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 5958 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 5959 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 5960 | |
0c93e1b7 ID |
5961 | if (rbd_dev->opts->alloc_size > rbd_dev->layout.object_size) { |
5962 | rbd_warn(rbd_dev, "alloc_size adjusted to %u", | |
5963 | rbd_dev->layout.object_size); | |
5964 | rbd_dev->opts->alloc_size = rbd_dev->layout.object_size; | |
5965 | } | |
5966 | ||
b536f69a | 5967 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 5968 | if (rc) |
8b679ec5 | 5969 | goto err_out_image_probe; |
3abef3b3 | 5970 | |
e010dd0a ID |
5971 | if (rbd_dev->opts->exclusive) { |
5972 | rc = rbd_add_acquire_lock(rbd_dev); | |
5973 | if (rc) | |
5974 | goto err_out_device_setup; | |
3abef3b3 AE |
5975 | } |
5976 | ||
5769ed0c ID |
5977 | /* Everything's ready. Announce the disk to the world. */ |
5978 | ||
5979 | rc = device_add(&rbd_dev->dev); | |
5980 | if (rc) | |
e010dd0a | 5981 | goto err_out_image_lock; |
5769ed0c ID |
5982 | |
5983 | add_disk(rbd_dev->disk); | |
5984 | /* see rbd_init_disk() */ | |
5985 | blk_put_queue(rbd_dev->disk->queue); | |
5986 | ||
5987 | spin_lock(&rbd_dev_list_lock); | |
5988 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5989 | spin_unlock(&rbd_dev_list_lock); | |
5990 | ||
5991 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
5992 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
5993 | rbd_dev->header.features); | |
dd5ac32d ID |
5994 | rc = count; |
5995 | out: | |
5996 | module_put(THIS_MODULE); | |
5997 | return rc; | |
b536f69a | 5998 | |
e010dd0a ID |
5999 | err_out_image_lock: |
6000 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
6001 | err_out_device_setup: |
6002 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
6003 | err_out_image_probe: |
6004 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
6005 | err_out_rbd_dev: |
6006 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 6007 | err_out_client: |
9d3997fd | 6008 | rbd_put_client(rbdc); |
0ddebc0c | 6009 | err_out_args: |
859c31df | 6010 | rbd_spec_put(spec); |
d147543d | 6011 | kfree(rbd_opts); |
dd5ac32d | 6012 | goto out; |
602adf40 YS |
6013 | } |
6014 | ||
9b60e70b ID |
6015 | static ssize_t rbd_add(struct bus_type *bus, |
6016 | const char *buf, | |
6017 | size_t count) | |
6018 | { | |
6019 | if (single_major) | |
6020 | return -EINVAL; | |
6021 | ||
6022 | return do_rbd_add(bus, buf, count); | |
6023 | } | |
6024 | ||
6025 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
6026 | const char *buf, | |
6027 | size_t count) | |
6028 | { | |
6029 | return do_rbd_add(bus, buf, count); | |
6030 | } | |
6031 | ||
05a46afd AE |
6032 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
6033 | { | |
ad945fc1 | 6034 | while (rbd_dev->parent) { |
05a46afd AE |
6035 | struct rbd_device *first = rbd_dev; |
6036 | struct rbd_device *second = first->parent; | |
6037 | struct rbd_device *third; | |
6038 | ||
6039 | /* | |
6040 | * Follow to the parent with no grandparent and | |
6041 | * remove it. | |
6042 | */ | |
6043 | while (second && (third = second->parent)) { | |
6044 | first = second; | |
6045 | second = third; | |
6046 | } | |
ad945fc1 | 6047 | rbd_assert(second); |
8ad42cd0 | 6048 | rbd_dev_image_release(second); |
8b679ec5 | 6049 | rbd_dev_destroy(second); |
ad945fc1 AE |
6050 | first->parent = NULL; |
6051 | first->parent_overlap = 0; | |
6052 | ||
6053 | rbd_assert(first->parent_spec); | |
05a46afd AE |
6054 | rbd_spec_put(first->parent_spec); |
6055 | first->parent_spec = NULL; | |
05a46afd AE |
6056 | } |
6057 | } | |
6058 | ||
9b60e70b ID |
6059 | static ssize_t do_rbd_remove(struct bus_type *bus, |
6060 | const char *buf, | |
6061 | size_t count) | |
602adf40 YS |
6062 | { |
6063 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
6064 | struct list_head *tmp; |
6065 | int dev_id; | |
0276dca6 | 6066 | char opt_buf[6]; |
0276dca6 | 6067 | bool force = false; |
0d8189e1 | 6068 | int ret; |
602adf40 | 6069 | |
0276dca6 MC |
6070 | dev_id = -1; |
6071 | opt_buf[0] = '\0'; | |
6072 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
6073 | if (dev_id < 0) { | |
6074 | pr_err("dev_id out of range\n"); | |
602adf40 | 6075 | return -EINVAL; |
0276dca6 MC |
6076 | } |
6077 | if (opt_buf[0] != '\0') { | |
6078 | if (!strcmp(opt_buf, "force")) { | |
6079 | force = true; | |
6080 | } else { | |
6081 | pr_err("bad remove option at '%s'\n", opt_buf); | |
6082 | return -EINVAL; | |
6083 | } | |
6084 | } | |
602adf40 | 6085 | |
751cc0e3 AE |
6086 | ret = -ENOENT; |
6087 | spin_lock(&rbd_dev_list_lock); | |
6088 | list_for_each(tmp, &rbd_dev_list) { | |
6089 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
6090 | if (rbd_dev->dev_id == dev_id) { | |
6091 | ret = 0; | |
6092 | break; | |
6093 | } | |
42382b70 | 6094 | } |
751cc0e3 AE |
6095 | if (!ret) { |
6096 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 6097 | if (rbd_dev->open_count && !force) |
751cc0e3 | 6098 | ret = -EBUSY; |
85f5a4d6 ID |
6099 | else if (test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
6100 | &rbd_dev->flags)) | |
6101 | ret = -EINPROGRESS; | |
751cc0e3 AE |
6102 | spin_unlock_irq(&rbd_dev->lock); |
6103 | } | |
6104 | spin_unlock(&rbd_dev_list_lock); | |
85f5a4d6 | 6105 | if (ret) |
1ba0f1e7 | 6106 | return ret; |
751cc0e3 | 6107 | |
0276dca6 MC |
6108 | if (force) { |
6109 | /* | |
6110 | * Prevent new IO from being queued and wait for existing | |
6111 | * IO to complete/fail. | |
6112 | */ | |
6113 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
6114 | blk_set_queue_dying(rbd_dev->disk->queue); | |
6115 | } | |
6116 | ||
5769ed0c ID |
6117 | del_gendisk(rbd_dev->disk); |
6118 | spin_lock(&rbd_dev_list_lock); | |
6119 | list_del_init(&rbd_dev->node); | |
6120 | spin_unlock(&rbd_dev_list_lock); | |
6121 | device_del(&rbd_dev->dev); | |
fca27065 | 6122 | |
e010dd0a | 6123 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 6124 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 6125 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 6126 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 6127 | return count; |
602adf40 YS |
6128 | } |
6129 | ||
9b60e70b ID |
6130 | static ssize_t rbd_remove(struct bus_type *bus, |
6131 | const char *buf, | |
6132 | size_t count) | |
6133 | { | |
6134 | if (single_major) | |
6135 | return -EINVAL; | |
6136 | ||
6137 | return do_rbd_remove(bus, buf, count); | |
6138 | } | |
6139 | ||
6140 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
6141 | const char *buf, | |
6142 | size_t count) | |
6143 | { | |
6144 | return do_rbd_remove(bus, buf, count); | |
6145 | } | |
6146 | ||
602adf40 YS |
6147 | /* |
6148 | * create control files in sysfs | |
dfc5606d | 6149 | * /sys/bus/rbd/... |
602adf40 | 6150 | */ |
7d8dc534 | 6151 | static int __init rbd_sysfs_init(void) |
602adf40 | 6152 | { |
dfc5606d | 6153 | int ret; |
602adf40 | 6154 | |
fed4c143 | 6155 | ret = device_register(&rbd_root_dev); |
21079786 | 6156 | if (ret < 0) |
dfc5606d | 6157 | return ret; |
602adf40 | 6158 | |
fed4c143 AE |
6159 | ret = bus_register(&rbd_bus_type); |
6160 | if (ret < 0) | |
6161 | device_unregister(&rbd_root_dev); | |
602adf40 | 6162 | |
602adf40 YS |
6163 | return ret; |
6164 | } | |
6165 | ||
7d8dc534 | 6166 | static void __exit rbd_sysfs_cleanup(void) |
602adf40 | 6167 | { |
dfc5606d | 6168 | bus_unregister(&rbd_bus_type); |
fed4c143 | 6169 | device_unregister(&rbd_root_dev); |
602adf40 YS |
6170 | } |
6171 | ||
7d8dc534 | 6172 | static int __init rbd_slab_init(void) |
1c2a9dfe AE |
6173 | { |
6174 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 6175 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
6176 | if (!rbd_img_request_cache) |
6177 | return -ENOMEM; | |
6178 | ||
6179 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 6180 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
6181 | if (!rbd_obj_request_cache) |
6182 | goto out_err; | |
6183 | ||
6c696d85 | 6184 | return 0; |
1c2a9dfe | 6185 | |
6c696d85 | 6186 | out_err: |
868311b1 AE |
6187 | kmem_cache_destroy(rbd_img_request_cache); |
6188 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
6189 | return -ENOMEM; |
6190 | } | |
6191 | ||
6192 | static void rbd_slab_exit(void) | |
6193 | { | |
868311b1 AE |
6194 | rbd_assert(rbd_obj_request_cache); |
6195 | kmem_cache_destroy(rbd_obj_request_cache); | |
6196 | rbd_obj_request_cache = NULL; | |
6197 | ||
1c2a9dfe AE |
6198 | rbd_assert(rbd_img_request_cache); |
6199 | kmem_cache_destroy(rbd_img_request_cache); | |
6200 | rbd_img_request_cache = NULL; | |
6201 | } | |
6202 | ||
cc344fa1 | 6203 | static int __init rbd_init(void) |
602adf40 YS |
6204 | { |
6205 | int rc; | |
6206 | ||
1e32d34c AE |
6207 | if (!libceph_compatible(NULL)) { |
6208 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
6209 | return -EINVAL; |
6210 | } | |
e1b4d96d | 6211 | |
1c2a9dfe | 6212 | rc = rbd_slab_init(); |
602adf40 YS |
6213 | if (rc) |
6214 | return rc; | |
e1b4d96d | 6215 | |
f5ee37bd ID |
6216 | /* |
6217 | * The number of active work items is limited by the number of | |
f77303bd | 6218 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
6219 | */ |
6220 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
6221 | if (!rbd_wq) { | |
6222 | rc = -ENOMEM; | |
6223 | goto err_out_slab; | |
6224 | } | |
6225 | ||
9b60e70b ID |
6226 | if (single_major) { |
6227 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
6228 | if (rbd_major < 0) { | |
6229 | rc = rbd_major; | |
f5ee37bd | 6230 | goto err_out_wq; |
9b60e70b ID |
6231 | } |
6232 | } | |
6233 | ||
1c2a9dfe AE |
6234 | rc = rbd_sysfs_init(); |
6235 | if (rc) | |
9b60e70b ID |
6236 | goto err_out_blkdev; |
6237 | ||
6238 | if (single_major) | |
6239 | pr_info("loaded (major %d)\n", rbd_major); | |
6240 | else | |
6241 | pr_info("loaded\n"); | |
1c2a9dfe | 6242 | |
e1b4d96d ID |
6243 | return 0; |
6244 | ||
9b60e70b ID |
6245 | err_out_blkdev: |
6246 | if (single_major) | |
6247 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
6248 | err_out_wq: |
6249 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
6250 | err_out_slab: |
6251 | rbd_slab_exit(); | |
1c2a9dfe | 6252 | return rc; |
602adf40 YS |
6253 | } |
6254 | ||
cc344fa1 | 6255 | static void __exit rbd_exit(void) |
602adf40 | 6256 | { |
ffe312cf | 6257 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 6258 | rbd_sysfs_cleanup(); |
9b60e70b ID |
6259 | if (single_major) |
6260 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 6261 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 6262 | rbd_slab_exit(); |
602adf40 YS |
6263 | } |
6264 | ||
6265 | module_init(rbd_init); | |
6266 | module_exit(rbd_exit); | |
6267 | ||
d552c619 | 6268 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
6269 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
6270 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
6271 | /* following authorship retained from original osdblk.c */ |
6272 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
6273 | ||
90da258b | 6274 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 6275 | MODULE_LICENSE("GPL"); |