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 | ||
593a9e7b AE |
54 | /* |
55 | * The basic unit of block I/O is a sector. It is interpreted in a | |
56 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
57 | * universally 512 bytes. These symbols are just slightly more | |
58 | * meaningful than the bare numbers they represent. | |
59 | */ | |
60 | #define SECTOR_SHIFT 9 | |
61 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
62 | ||
a2acd00e AE |
63 | /* |
64 | * Increment the given counter and return its updated value. | |
65 | * If the counter is already 0 it will not be incremented. | |
66 | * If the counter is already at its maximum value returns | |
67 | * -EINVAL without updating it. | |
68 | */ | |
69 | static int atomic_inc_return_safe(atomic_t *v) | |
70 | { | |
71 | unsigned int counter; | |
72 | ||
73 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
74 | if (counter <= (unsigned int)INT_MAX) | |
75 | return (int)counter; | |
76 | ||
77 | atomic_dec(v); | |
78 | ||
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
83 | static int atomic_dec_return_safe(atomic_t *v) | |
84 | { | |
85 | int counter; | |
86 | ||
87 | counter = atomic_dec_return(v); | |
88 | if (counter >= 0) | |
89 | return counter; | |
90 | ||
91 | atomic_inc(v); | |
92 | ||
93 | return -EINVAL; | |
94 | } | |
95 | ||
f0f8cef5 | 96 | #define RBD_DRV_NAME "rbd" |
602adf40 | 97 | |
7e513d43 ID |
98 | #define RBD_MINORS_PER_MAJOR 256 |
99 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 100 | |
6d69bb53 ID |
101 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
102 | ||
d4b125e9 AE |
103 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
104 | #define RBD_MAX_SNAP_NAME_LEN \ | |
105 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
106 | ||
35d489f9 | 107 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
108 | |
109 | #define RBD_SNAP_HEAD_NAME "-" | |
110 | ||
9682fc6d AE |
111 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
112 | ||
9e15b77d AE |
113 | /* This allows a single page to hold an image name sent by OSD */ |
114 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 115 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 116 | |
1e130199 | 117 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 118 | |
ed95b21a | 119 | #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
99d16943 ID |
120 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
121 | ||
d889140c AE |
122 | /* Feature bits */ |
123 | ||
8767b293 ID |
124 | #define RBD_FEATURE_LAYERING (1ULL<<0) |
125 | #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) | |
126 | #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) | |
127 | #define RBD_FEATURE_DATA_POOL (1ULL<<7) | |
e573427a | 128 | #define RBD_FEATURE_OPERATIONS (1ULL<<8) |
8767b293 | 129 | |
ed95b21a ID |
130 | #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
131 | RBD_FEATURE_STRIPINGV2 | \ | |
7e97332e | 132 | RBD_FEATURE_EXCLUSIVE_LOCK | \ |
e573427a ID |
133 | RBD_FEATURE_DATA_POOL | \ |
134 | RBD_FEATURE_OPERATIONS) | |
d889140c AE |
135 | |
136 | /* Features supported by this (client software) implementation. */ | |
137 | ||
770eba6e | 138 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 139 | |
81a89793 AE |
140 | /* |
141 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
142 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 143 | */ |
602adf40 YS |
144 | #define DEV_NAME_LEN 32 |
145 | ||
146 | /* | |
147 | * block device image metadata (in-memory version) | |
148 | */ | |
149 | struct rbd_image_header { | |
f35a4dee | 150 | /* These six fields never change for a given rbd image */ |
849b4260 | 151 | char *object_prefix; |
602adf40 | 152 | __u8 obj_order; |
f35a4dee AE |
153 | u64 stripe_unit; |
154 | u64 stripe_count; | |
7e97332e | 155 | s64 data_pool_id; |
f35a4dee | 156 | u64 features; /* Might be changeable someday? */ |
602adf40 | 157 | |
f84344f3 AE |
158 | /* The remaining fields need to be updated occasionally */ |
159 | u64 image_size; | |
160 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
161 | char *snap_names; /* format 1 only */ |
162 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
163 | }; |
164 | ||
0d7dbfce AE |
165 | /* |
166 | * An rbd image specification. | |
167 | * | |
168 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
169 | * identify an image. Each rbd_dev structure includes a pointer to |
170 | * an rbd_spec structure that encapsulates this identity. | |
171 | * | |
172 | * Each of the id's in an rbd_spec has an associated name. For a | |
173 | * user-mapped image, the names are supplied and the id's associated | |
174 | * with them are looked up. For a layered image, a parent image is | |
175 | * defined by the tuple, and the names are looked up. | |
176 | * | |
177 | * An rbd_dev structure contains a parent_spec pointer which is | |
178 | * non-null if the image it represents is a child in a layered | |
179 | * image. This pointer will refer to the rbd_spec structure used | |
180 | * by the parent rbd_dev for its own identity (i.e., the structure | |
181 | * is shared between the parent and child). | |
182 | * | |
183 | * Since these structures are populated once, during the discovery | |
184 | * phase of image construction, they are effectively immutable so | |
185 | * we make no effort to synchronize access to them. | |
186 | * | |
187 | * Note that code herein does not assume the image name is known (it | |
188 | * could be a null pointer). | |
0d7dbfce AE |
189 | */ |
190 | struct rbd_spec { | |
191 | u64 pool_id; | |
ecb4dc22 | 192 | const char *pool_name; |
0d7dbfce | 193 | |
ecb4dc22 AE |
194 | const char *image_id; |
195 | const char *image_name; | |
0d7dbfce AE |
196 | |
197 | u64 snap_id; | |
ecb4dc22 | 198 | const char *snap_name; |
0d7dbfce AE |
199 | |
200 | struct kref kref; | |
201 | }; | |
202 | ||
602adf40 | 203 | /* |
f0f8cef5 | 204 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
205 | */ |
206 | struct rbd_client { | |
207 | struct ceph_client *client; | |
208 | struct kref kref; | |
209 | struct list_head node; | |
210 | }; | |
211 | ||
bf0d5f50 | 212 | struct rbd_img_request; |
bf0d5f50 | 213 | |
9969ebc5 | 214 | enum obj_request_type { |
a1fbb5e7 | 215 | OBJ_REQUEST_NODATA = 1, |
5359a17d | 216 | OBJ_REQUEST_BIO, /* pointer into provided bio (list) */ |
7e07efb1 | 217 | OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */ |
afb97888 | 218 | OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */ |
9969ebc5 | 219 | }; |
bf0d5f50 | 220 | |
6d2940c8 | 221 | enum obj_operation_type { |
a1fbb5e7 | 222 | OBJ_OP_READ = 1, |
6d2940c8 | 223 | OBJ_OP_WRITE, |
90e98c52 | 224 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
225 | }; |
226 | ||
3da691bf ID |
227 | /* |
228 | * Writes go through the following state machine to deal with | |
229 | * layering: | |
230 | * | |
231 | * need copyup | |
232 | * RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP | |
233 | * | ^ | | |
234 | * v \------------------------------/ | |
235 | * done | |
236 | * ^ | |
237 | * | | |
238 | * RBD_OBJ_WRITE_FLAT | |
239 | * | |
240 | * Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether | |
241 | * there is a parent or not. | |
242 | */ | |
243 | enum rbd_obj_write_state { | |
244 | RBD_OBJ_WRITE_FLAT = 1, | |
245 | RBD_OBJ_WRITE_GUARD, | |
246 | RBD_OBJ_WRITE_COPYUP, | |
247 | }; | |
248 | ||
bf0d5f50 | 249 | struct rbd_obj_request { |
43df3d35 | 250 | struct ceph_object_extent ex; |
3da691bf ID |
251 | union { |
252 | bool tried_parent; /* for reads */ | |
253 | enum rbd_obj_write_state write_state; /* for writes */ | |
254 | }; | |
bf0d5f50 | 255 | |
51c3509e | 256 | struct rbd_img_request *img_request; |
86bd7998 ID |
257 | struct ceph_file_extent *img_extents; |
258 | u32 num_img_extents; | |
bf0d5f50 | 259 | |
788e2df3 | 260 | union { |
5359a17d | 261 | struct ceph_bio_iter bio_pos; |
788e2df3 | 262 | struct { |
7e07efb1 ID |
263 | struct ceph_bvec_iter bvec_pos; |
264 | u32 bvec_count; | |
afb97888 | 265 | u32 bvec_idx; |
788e2df3 AE |
266 | }; |
267 | }; | |
7e07efb1 ID |
268 | struct bio_vec *copyup_bvecs; |
269 | u32 copyup_bvec_count; | |
bf0d5f50 AE |
270 | |
271 | struct ceph_osd_request *osd_req; | |
272 | ||
273 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 274 | int result; |
bf0d5f50 | 275 | |
bf0d5f50 AE |
276 | struct kref kref; |
277 | }; | |
278 | ||
0c425248 | 279 | enum img_req_flags { |
9849e986 | 280 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
d0b2e944 | 281 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
282 | }; |
283 | ||
bf0d5f50 | 284 | struct rbd_img_request { |
bf0d5f50 | 285 | struct rbd_device *rbd_dev; |
9bb0248d | 286 | enum obj_operation_type op_type; |
ecc633ca | 287 | enum obj_request_type data_type; |
0c425248 | 288 | unsigned long flags; |
bf0d5f50 | 289 | union { |
9849e986 | 290 | u64 snap_id; /* for reads */ |
bf0d5f50 | 291 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
292 | }; |
293 | union { | |
294 | struct request *rq; /* block request */ | |
295 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 296 | }; |
15961b44 | 297 | spinlock_t completion_lock; |
55f27e09 | 298 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 299 | int result; /* first nonzero obj_request result */ |
bf0d5f50 | 300 | |
43df3d35 | 301 | struct list_head object_extents; /* obj_req.ex structs */ |
bf0d5f50 | 302 | u32 obj_request_count; |
7114edac | 303 | u32 pending_count; |
bf0d5f50 AE |
304 | |
305 | struct kref kref; | |
306 | }; | |
307 | ||
308 | #define for_each_obj_request(ireq, oreq) \ | |
43df3d35 | 309 | list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 310 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
43df3d35 | 311 | list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item) |
bf0d5f50 | 312 | |
99d16943 ID |
313 | enum rbd_watch_state { |
314 | RBD_WATCH_STATE_UNREGISTERED, | |
315 | RBD_WATCH_STATE_REGISTERED, | |
316 | RBD_WATCH_STATE_ERROR, | |
317 | }; | |
318 | ||
ed95b21a ID |
319 | enum rbd_lock_state { |
320 | RBD_LOCK_STATE_UNLOCKED, | |
321 | RBD_LOCK_STATE_LOCKED, | |
322 | RBD_LOCK_STATE_RELEASING, | |
323 | }; | |
324 | ||
325 | /* WatchNotify::ClientId */ | |
326 | struct rbd_client_id { | |
327 | u64 gid; | |
328 | u64 handle; | |
329 | }; | |
330 | ||
f84344f3 | 331 | struct rbd_mapping { |
99c1f08f | 332 | u64 size; |
34b13184 | 333 | u64 features; |
f84344f3 AE |
334 | }; |
335 | ||
602adf40 YS |
336 | /* |
337 | * a single device | |
338 | */ | |
339 | struct rbd_device { | |
de71a297 | 340 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
341 | |
342 | int major; /* blkdev assigned major */ | |
dd82fff1 | 343 | int minor; |
602adf40 | 344 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 345 | |
a30b71b9 | 346 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
347 | struct rbd_client *rbd_client; |
348 | ||
349 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
350 | ||
b82d167b | 351 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
352 | |
353 | struct rbd_image_header header; | |
b82d167b | 354 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 355 | struct rbd_spec *spec; |
d147543d | 356 | struct rbd_options *opts; |
0d6d1e9c | 357 | char *config_info; /* add{,_single_major} string */ |
602adf40 | 358 | |
c41d13a3 | 359 | struct ceph_object_id header_oid; |
922dab61 | 360 | struct ceph_object_locator header_oloc; |
971f839a | 361 | |
1643dfa4 | 362 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 363 | |
99d16943 ID |
364 | struct mutex watch_mutex; |
365 | enum rbd_watch_state watch_state; | |
922dab61 | 366 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
367 | u64 watch_cookie; |
368 | struct delayed_work watch_dwork; | |
59c2be1e | 369 | |
ed95b21a ID |
370 | struct rw_semaphore lock_rwsem; |
371 | enum rbd_lock_state lock_state; | |
cbbfb0ff | 372 | char lock_cookie[32]; |
ed95b21a ID |
373 | struct rbd_client_id owner_cid; |
374 | struct work_struct acquired_lock_work; | |
375 | struct work_struct released_lock_work; | |
376 | struct delayed_work lock_dwork; | |
377 | struct work_struct unlock_work; | |
378 | wait_queue_head_t lock_waitq; | |
379 | ||
1643dfa4 | 380 | struct workqueue_struct *task_wq; |
59c2be1e | 381 | |
86b00e0d AE |
382 | struct rbd_spec *parent_spec; |
383 | u64 parent_overlap; | |
a2acd00e | 384 | atomic_t parent_ref; |
2f82ee54 | 385 | struct rbd_device *parent; |
86b00e0d | 386 | |
7ad18afa CH |
387 | /* Block layer tags. */ |
388 | struct blk_mq_tag_set tag_set; | |
389 | ||
c666601a JD |
390 | /* protects updating the header */ |
391 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
392 | |
393 | struct rbd_mapping mapping; | |
602adf40 YS |
394 | |
395 | struct list_head node; | |
dfc5606d | 396 | |
dfc5606d YS |
397 | /* sysfs related */ |
398 | struct device dev; | |
b82d167b | 399 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
400 | }; |
401 | ||
b82d167b | 402 | /* |
87c0fded ID |
403 | * Flag bits for rbd_dev->flags: |
404 | * - REMOVING (which is coupled with rbd_dev->open_count) is protected | |
405 | * by rbd_dev->lock | |
406 | * - BLACKLISTED is protected by rbd_dev->lock_rwsem | |
b82d167b | 407 | */ |
6d292906 AE |
408 | enum rbd_dev_flags { |
409 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 410 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
87c0fded | 411 | RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
6d292906 AE |
412 | }; |
413 | ||
cfbf6377 | 414 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 415 | |
602adf40 | 416 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
417 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
418 | ||
432b8587 AE |
419 | static LIST_HEAD(rbd_client_list); /* clients */ |
420 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 421 | |
78c2a44a AE |
422 | /* Slab caches for frequently-allocated structures */ |
423 | ||
1c2a9dfe | 424 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 425 | static struct kmem_cache *rbd_obj_request_cache; |
1c2a9dfe | 426 | |
9b60e70b | 427 | static int rbd_major; |
f8a22fc2 ID |
428 | static DEFINE_IDA(rbd_dev_id_ida); |
429 | ||
f5ee37bd ID |
430 | static struct workqueue_struct *rbd_wq; |
431 | ||
9b60e70b | 432 | /* |
3cfa3b16 | 433 | * single-major requires >= 0.75 version of userspace rbd utility. |
9b60e70b | 434 | */ |
3cfa3b16 | 435 | static bool single_major = true; |
9b60e70b | 436 | module_param(single_major, bool, S_IRUGO); |
3cfa3b16 | 437 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); |
9b60e70b | 438 | |
f0f8cef5 AE |
439 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
440 | size_t count); | |
441 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
442 | size_t count); | |
9b60e70b ID |
443 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
444 | size_t count); | |
445 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
446 | size_t count); | |
6d69bb53 | 447 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
f0f8cef5 | 448 | |
9b60e70b ID |
449 | static int rbd_dev_id_to_minor(int dev_id) |
450 | { | |
7e513d43 | 451 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
452 | } |
453 | ||
454 | static int minor_to_rbd_dev_id(int minor) | |
455 | { | |
7e513d43 | 456 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
457 | } |
458 | ||
ed95b21a ID |
459 | static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
460 | { | |
461 | return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || | |
462 | rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; | |
463 | } | |
464 | ||
465 | static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) | |
466 | { | |
467 | bool is_lock_owner; | |
468 | ||
469 | down_read(&rbd_dev->lock_rwsem); | |
470 | is_lock_owner = __rbd_is_lock_owner(rbd_dev); | |
471 | up_read(&rbd_dev->lock_rwsem); | |
472 | return is_lock_owner; | |
473 | } | |
474 | ||
8767b293 ID |
475 | static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
476 | { | |
477 | return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); | |
478 | } | |
479 | ||
b15a21dd GKH |
480 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
481 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
482 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
483 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
8767b293 | 484 | static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL); |
b15a21dd GKH |
485 | |
486 | static struct attribute *rbd_bus_attrs[] = { | |
487 | &bus_attr_add.attr, | |
488 | &bus_attr_remove.attr, | |
9b60e70b ID |
489 | &bus_attr_add_single_major.attr, |
490 | &bus_attr_remove_single_major.attr, | |
8767b293 | 491 | &bus_attr_supported_features.attr, |
b15a21dd | 492 | NULL, |
f0f8cef5 | 493 | }; |
92c76dc0 ID |
494 | |
495 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
496 | struct attribute *attr, int index) | |
497 | { | |
9b60e70b ID |
498 | if (!single_major && |
499 | (attr == &bus_attr_add_single_major.attr || | |
500 | attr == &bus_attr_remove_single_major.attr)) | |
501 | return 0; | |
502 | ||
92c76dc0 ID |
503 | return attr->mode; |
504 | } | |
505 | ||
506 | static const struct attribute_group rbd_bus_group = { | |
507 | .attrs = rbd_bus_attrs, | |
508 | .is_visible = rbd_bus_is_visible, | |
509 | }; | |
510 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
511 | |
512 | static struct bus_type rbd_bus_type = { | |
513 | .name = "rbd", | |
b15a21dd | 514 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
515 | }; |
516 | ||
517 | static void rbd_root_dev_release(struct device *dev) | |
518 | { | |
519 | } | |
520 | ||
521 | static struct device rbd_root_dev = { | |
522 | .init_name = "rbd", | |
523 | .release = rbd_root_dev_release, | |
524 | }; | |
525 | ||
06ecc6cb AE |
526 | static __printf(2, 3) |
527 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
528 | { | |
529 | struct va_format vaf; | |
530 | va_list args; | |
531 | ||
532 | va_start(args, fmt); | |
533 | vaf.fmt = fmt; | |
534 | vaf.va = &args; | |
535 | ||
536 | if (!rbd_dev) | |
537 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
538 | else if (rbd_dev->disk) | |
539 | printk(KERN_WARNING "%s: %s: %pV\n", | |
540 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
541 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
542 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
543 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
544 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
545 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
546 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
547 | else /* punt */ | |
548 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
549 | RBD_DRV_NAME, rbd_dev, &vaf); | |
550 | va_end(args); | |
551 | } | |
552 | ||
aafb230e AE |
553 | #ifdef RBD_DEBUG |
554 | #define rbd_assert(expr) \ | |
555 | if (unlikely(!(expr))) { \ | |
556 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
557 | "at line %d:\n\n" \ | |
558 | "\trbd_assert(%s);\n\n", \ | |
559 | __func__, __LINE__, #expr); \ | |
560 | BUG(); \ | |
561 | } | |
562 | #else /* !RBD_DEBUG */ | |
563 | # define rbd_assert(expr) ((void) 0) | |
564 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 565 | |
05a46afd | 566 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
8b3e1a56 | 567 | |
cc4a38bd | 568 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 569 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 570 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 571 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
572 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
573 | u64 snap_id); | |
2ad3d716 AE |
574 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
575 | u8 *order, u64 *snap_size); | |
576 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
577 | u64 *snap_features); | |
59c2be1e | 578 | |
602adf40 YS |
579 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
580 | { | |
f0f8cef5 | 581 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 582 | bool removing = false; |
602adf40 | 583 | |
a14ea269 | 584 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
585 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
586 | removing = true; | |
587 | else | |
588 | rbd_dev->open_count++; | |
a14ea269 | 589 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
590 | if (removing) |
591 | return -ENOENT; | |
592 | ||
c3e946ce | 593 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 594 | |
602adf40 YS |
595 | return 0; |
596 | } | |
597 | ||
db2a144b | 598 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
599 | { |
600 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
601 | unsigned long open_count_before; |
602 | ||
a14ea269 | 603 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 604 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 605 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 606 | rbd_assert(open_count_before > 0); |
dfc5606d | 607 | |
c3e946ce | 608 | put_device(&rbd_dev->dev); |
dfc5606d YS |
609 | } |
610 | ||
131fd9f6 GZ |
611 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
612 | { | |
1de797bb | 613 | int ro; |
131fd9f6 | 614 | |
1de797bb | 615 | if (get_user(ro, (int __user *)arg)) |
131fd9f6 GZ |
616 | return -EFAULT; |
617 | ||
1de797bb | 618 | /* Snapshots can't be marked read-write */ |
131fd9f6 GZ |
619 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
620 | return -EROFS; | |
621 | ||
1de797bb ID |
622 | /* Let blkdev_roset() handle it */ |
623 | return -ENOTTY; | |
131fd9f6 GZ |
624 | } |
625 | ||
626 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
627 | unsigned int cmd, unsigned long arg) | |
628 | { | |
629 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
1de797bb | 630 | int ret; |
131fd9f6 | 631 | |
131fd9f6 GZ |
632 | switch (cmd) { |
633 | case BLKROSET: | |
634 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
635 | break; | |
636 | default: | |
637 | ret = -ENOTTY; | |
638 | } | |
639 | ||
131fd9f6 GZ |
640 | return ret; |
641 | } | |
642 | ||
643 | #ifdef CONFIG_COMPAT | |
644 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
645 | unsigned int cmd, unsigned long arg) | |
646 | { | |
647 | return rbd_ioctl(bdev, mode, cmd, arg); | |
648 | } | |
649 | #endif /* CONFIG_COMPAT */ | |
650 | ||
602adf40 YS |
651 | static const struct block_device_operations rbd_bd_ops = { |
652 | .owner = THIS_MODULE, | |
653 | .open = rbd_open, | |
dfc5606d | 654 | .release = rbd_release, |
131fd9f6 GZ |
655 | .ioctl = rbd_ioctl, |
656 | #ifdef CONFIG_COMPAT | |
657 | .compat_ioctl = rbd_compat_ioctl, | |
658 | #endif | |
602adf40 YS |
659 | }; |
660 | ||
661 | /* | |
7262cfca | 662 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 663 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 664 | */ |
f8c38929 | 665 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
666 | { |
667 | struct rbd_client *rbdc; | |
668 | int ret = -ENOMEM; | |
669 | ||
37206ee5 | 670 | dout("%s:\n", __func__); |
602adf40 YS |
671 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
672 | if (!rbdc) | |
673 | goto out_opt; | |
674 | ||
675 | kref_init(&rbdc->kref); | |
676 | INIT_LIST_HEAD(&rbdc->node); | |
677 | ||
74da4a0f | 678 | rbdc->client = ceph_create_client(ceph_opts, rbdc); |
602adf40 | 679 | if (IS_ERR(rbdc->client)) |
08f75463 | 680 | goto out_rbdc; |
43ae4701 | 681 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
682 | |
683 | ret = ceph_open_session(rbdc->client); | |
684 | if (ret < 0) | |
08f75463 | 685 | goto out_client; |
602adf40 | 686 | |
432b8587 | 687 | spin_lock(&rbd_client_list_lock); |
602adf40 | 688 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 689 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 690 | |
37206ee5 | 691 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 692 | |
602adf40 | 693 | return rbdc; |
08f75463 | 694 | out_client: |
602adf40 | 695 | ceph_destroy_client(rbdc->client); |
08f75463 | 696 | out_rbdc: |
602adf40 YS |
697 | kfree(rbdc); |
698 | out_opt: | |
43ae4701 AE |
699 | if (ceph_opts) |
700 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
701 | dout("%s: error %d\n", __func__, ret); |
702 | ||
28f259b7 | 703 | return ERR_PTR(ret); |
602adf40 YS |
704 | } |
705 | ||
2f82ee54 AE |
706 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
707 | { | |
708 | kref_get(&rbdc->kref); | |
709 | ||
710 | return rbdc; | |
711 | } | |
712 | ||
602adf40 | 713 | /* |
1f7ba331 AE |
714 | * Find a ceph client with specific addr and configuration. If |
715 | * found, bump its reference count. | |
602adf40 | 716 | */ |
1f7ba331 | 717 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
718 | { |
719 | struct rbd_client *client_node; | |
1f7ba331 | 720 | bool found = false; |
602adf40 | 721 | |
43ae4701 | 722 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
723 | return NULL; |
724 | ||
1f7ba331 AE |
725 | spin_lock(&rbd_client_list_lock); |
726 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
727 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
728 | __rbd_get_client(client_node); |
729 | ||
1f7ba331 AE |
730 | found = true; |
731 | break; | |
732 | } | |
733 | } | |
734 | spin_unlock(&rbd_client_list_lock); | |
735 | ||
736 | return found ? client_node : NULL; | |
602adf40 YS |
737 | } |
738 | ||
59c2be1e | 739 | /* |
210c104c | 740 | * (Per device) rbd map options |
59c2be1e YS |
741 | */ |
742 | enum { | |
b5584180 | 743 | Opt_queue_depth, |
59c2be1e YS |
744 | Opt_last_int, |
745 | /* int args above */ | |
746 | Opt_last_string, | |
747 | /* string args above */ | |
cc0538b6 AE |
748 | Opt_read_only, |
749 | Opt_read_write, | |
80de1912 | 750 | Opt_lock_on_read, |
e010dd0a | 751 | Opt_exclusive, |
210c104c | 752 | Opt_err |
59c2be1e YS |
753 | }; |
754 | ||
43ae4701 | 755 | static match_table_t rbd_opts_tokens = { |
b5584180 | 756 | {Opt_queue_depth, "queue_depth=%d"}, |
59c2be1e YS |
757 | /* int args above */ |
758 | /* string args above */ | |
be466c1c | 759 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
760 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
761 | {Opt_read_write, "read_write"}, | |
762 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
80de1912 | 763 | {Opt_lock_on_read, "lock_on_read"}, |
e010dd0a | 764 | {Opt_exclusive, "exclusive"}, |
210c104c | 765 | {Opt_err, NULL} |
59c2be1e YS |
766 | }; |
767 | ||
98571b5a | 768 | struct rbd_options { |
b5584180 | 769 | int queue_depth; |
98571b5a | 770 | bool read_only; |
80de1912 | 771 | bool lock_on_read; |
e010dd0a | 772 | bool exclusive; |
98571b5a AE |
773 | }; |
774 | ||
b5584180 | 775 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
98571b5a | 776 | #define RBD_READ_ONLY_DEFAULT false |
80de1912 | 777 | #define RBD_LOCK_ON_READ_DEFAULT false |
e010dd0a | 778 | #define RBD_EXCLUSIVE_DEFAULT false |
98571b5a | 779 | |
59c2be1e YS |
780 | static int parse_rbd_opts_token(char *c, void *private) |
781 | { | |
43ae4701 | 782 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
783 | substring_t argstr[MAX_OPT_ARGS]; |
784 | int token, intval, ret; | |
785 | ||
43ae4701 | 786 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
787 | if (token < Opt_last_int) { |
788 | ret = match_int(&argstr[0], &intval); | |
789 | if (ret < 0) { | |
210c104c | 790 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
791 | return ret; |
792 | } | |
793 | dout("got int token %d val %d\n", token, intval); | |
794 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 795 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
796 | } else { |
797 | dout("got token %d\n", token); | |
798 | } | |
799 | ||
800 | switch (token) { | |
b5584180 ID |
801 | case Opt_queue_depth: |
802 | if (intval < 1) { | |
803 | pr_err("queue_depth out of range\n"); | |
804 | return -EINVAL; | |
805 | } | |
806 | rbd_opts->queue_depth = intval; | |
807 | break; | |
cc0538b6 AE |
808 | case Opt_read_only: |
809 | rbd_opts->read_only = true; | |
810 | break; | |
811 | case Opt_read_write: | |
812 | rbd_opts->read_only = false; | |
813 | break; | |
80de1912 ID |
814 | case Opt_lock_on_read: |
815 | rbd_opts->lock_on_read = true; | |
816 | break; | |
e010dd0a ID |
817 | case Opt_exclusive: |
818 | rbd_opts->exclusive = true; | |
819 | break; | |
59c2be1e | 820 | default: |
210c104c ID |
821 | /* libceph prints "bad option" msg */ |
822 | return -EINVAL; | |
59c2be1e | 823 | } |
210c104c | 824 | |
59c2be1e YS |
825 | return 0; |
826 | } | |
827 | ||
6d2940c8 GZ |
828 | static char* obj_op_name(enum obj_operation_type op_type) |
829 | { | |
830 | switch (op_type) { | |
831 | case OBJ_OP_READ: | |
832 | return "read"; | |
833 | case OBJ_OP_WRITE: | |
834 | return "write"; | |
90e98c52 GZ |
835 | case OBJ_OP_DISCARD: |
836 | return "discard"; | |
6d2940c8 GZ |
837 | default: |
838 | return "???"; | |
839 | } | |
840 | } | |
841 | ||
602adf40 YS |
842 | /* |
843 | * Destroy ceph client | |
d23a4b3f | 844 | * |
432b8587 | 845 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
846 | */ |
847 | static void rbd_client_release(struct kref *kref) | |
848 | { | |
849 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
850 | ||
37206ee5 | 851 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 852 | spin_lock(&rbd_client_list_lock); |
602adf40 | 853 | list_del(&rbdc->node); |
cd9d9f5d | 854 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
855 | |
856 | ceph_destroy_client(rbdc->client); | |
857 | kfree(rbdc); | |
858 | } | |
859 | ||
860 | /* | |
861 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
862 | * it. | |
863 | */ | |
9d3997fd | 864 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 865 | { |
c53d5893 AE |
866 | if (rbdc) |
867 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
868 | } |
869 | ||
5feb0d8d ID |
870 | /* |
871 | * Get a ceph client with specific addr and configuration, if one does | |
872 | * not exist create it. Either way, ceph_opts is consumed by this | |
873 | * function. | |
874 | */ | |
875 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) | |
876 | { | |
877 | struct rbd_client *rbdc; | |
878 | ||
879 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); | |
880 | rbdc = rbd_client_find(ceph_opts); | |
881 | if (rbdc) /* using an existing client */ | |
882 | ceph_destroy_options(ceph_opts); | |
883 | else | |
884 | rbdc = rbd_client_create(ceph_opts); | |
885 | mutex_unlock(&client_mutex); | |
886 | ||
887 | return rbdc; | |
888 | } | |
889 | ||
a30b71b9 AE |
890 | static bool rbd_image_format_valid(u32 image_format) |
891 | { | |
892 | return image_format == 1 || image_format == 2; | |
893 | } | |
894 | ||
8e94af8e AE |
895 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
896 | { | |
103a150f AE |
897 | size_t size; |
898 | u32 snap_count; | |
899 | ||
900 | /* The header has to start with the magic rbd header text */ | |
901 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
902 | return false; | |
903 | ||
db2388b6 AE |
904 | /* The bio layer requires at least sector-sized I/O */ |
905 | ||
906 | if (ondisk->options.order < SECTOR_SHIFT) | |
907 | return false; | |
908 | ||
909 | /* If we use u64 in a few spots we may be able to loosen this */ | |
910 | ||
911 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
912 | return false; | |
913 | ||
103a150f AE |
914 | /* |
915 | * The size of a snapshot header has to fit in a size_t, and | |
916 | * that limits the number of snapshots. | |
917 | */ | |
918 | snap_count = le32_to_cpu(ondisk->snap_count); | |
919 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
920 | if (snap_count > size / sizeof (__le64)) | |
921 | return false; | |
922 | ||
923 | /* | |
924 | * Not only that, but the size of the entire the snapshot | |
925 | * header must also be representable in a size_t. | |
926 | */ | |
927 | size -= snap_count * sizeof (__le64); | |
928 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
929 | return false; | |
930 | ||
931 | return true; | |
8e94af8e AE |
932 | } |
933 | ||
5bc3fb17 ID |
934 | /* |
935 | * returns the size of an object in the image | |
936 | */ | |
937 | static u32 rbd_obj_bytes(struct rbd_image_header *header) | |
938 | { | |
939 | return 1U << header->obj_order; | |
940 | } | |
941 | ||
263423f8 ID |
942 | static void rbd_init_layout(struct rbd_device *rbd_dev) |
943 | { | |
944 | if (rbd_dev->header.stripe_unit == 0 || | |
945 | rbd_dev->header.stripe_count == 0) { | |
946 | rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); | |
947 | rbd_dev->header.stripe_count = 1; | |
948 | } | |
949 | ||
950 | rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; | |
951 | rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; | |
952 | rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); | |
7e97332e ID |
953 | rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
954 | rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; | |
263423f8 ID |
955 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
956 | } | |
957 | ||
602adf40 | 958 | /* |
bb23e37a AE |
959 | * Fill an rbd image header with information from the given format 1 |
960 | * on-disk header. | |
602adf40 | 961 | */ |
662518b1 | 962 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 963 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 964 | { |
662518b1 | 965 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
966 | bool first_time = header->object_prefix == NULL; |
967 | struct ceph_snap_context *snapc; | |
968 | char *object_prefix = NULL; | |
969 | char *snap_names = NULL; | |
970 | u64 *snap_sizes = NULL; | |
ccece235 | 971 | u32 snap_count; |
bb23e37a | 972 | int ret = -ENOMEM; |
621901d6 | 973 | u32 i; |
602adf40 | 974 | |
bb23e37a | 975 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 976 | |
bb23e37a | 977 | if (first_time) { |
848d796c ID |
978 | object_prefix = kstrndup(ondisk->object_prefix, |
979 | sizeof(ondisk->object_prefix), | |
980 | GFP_KERNEL); | |
bb23e37a AE |
981 | if (!object_prefix) |
982 | return -ENOMEM; | |
bb23e37a | 983 | } |
00f1f36f | 984 | |
bb23e37a | 985 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 986 | |
bb23e37a AE |
987 | snap_count = le32_to_cpu(ondisk->snap_count); |
988 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
989 | if (!snapc) | |
990 | goto out_err; | |
991 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 992 | if (snap_count) { |
bb23e37a | 993 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
994 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
995 | ||
bb23e37a | 996 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 997 | |
bb23e37a AE |
998 | if (snap_names_len > (u64)SIZE_MAX) |
999 | goto out_2big; | |
1000 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
1001 | if (!snap_names) | |
6a52325f AE |
1002 | goto out_err; |
1003 | ||
bb23e37a | 1004 | /* ...as well as the array of their sizes. */ |
88a25a5f ME |
1005 | snap_sizes = kmalloc_array(snap_count, |
1006 | sizeof(*header->snap_sizes), | |
1007 | GFP_KERNEL); | |
bb23e37a | 1008 | if (!snap_sizes) |
6a52325f | 1009 | goto out_err; |
bb23e37a | 1010 | |
f785cc1d | 1011 | /* |
bb23e37a AE |
1012 | * Copy the names, and fill in each snapshot's id |
1013 | * and size. | |
1014 | * | |
99a41ebc | 1015 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 1016 | * ondisk buffer we're working with has |
f785cc1d AE |
1017 | * snap_names_len bytes beyond the end of the |
1018 | * snapshot id array, this memcpy() is safe. | |
1019 | */ | |
bb23e37a AE |
1020 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
1021 | snaps = ondisk->snaps; | |
1022 | for (i = 0; i < snap_count; i++) { | |
1023 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
1024 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
1025 | } | |
602adf40 | 1026 | } |
6a52325f | 1027 | |
bb23e37a | 1028 | /* We won't fail any more, fill in the header */ |
621901d6 | 1029 | |
bb23e37a AE |
1030 | if (first_time) { |
1031 | header->object_prefix = object_prefix; | |
1032 | header->obj_order = ondisk->options.order; | |
263423f8 | 1033 | rbd_init_layout(rbd_dev); |
602adf40 | 1034 | } else { |
662518b1 AE |
1035 | ceph_put_snap_context(header->snapc); |
1036 | kfree(header->snap_names); | |
1037 | kfree(header->snap_sizes); | |
602adf40 | 1038 | } |
849b4260 | 1039 | |
bb23e37a | 1040 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1041 | |
f84344f3 | 1042 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1043 | header->snapc = snapc; |
1044 | header->snap_names = snap_names; | |
1045 | header->snap_sizes = snap_sizes; | |
468521c1 | 1046 | |
602adf40 | 1047 | return 0; |
bb23e37a AE |
1048 | out_2big: |
1049 | ret = -EIO; | |
6a52325f | 1050 | out_err: |
bb23e37a AE |
1051 | kfree(snap_sizes); |
1052 | kfree(snap_names); | |
1053 | ceph_put_snap_context(snapc); | |
1054 | kfree(object_prefix); | |
ccece235 | 1055 | |
bb23e37a | 1056 | return ret; |
602adf40 YS |
1057 | } |
1058 | ||
9682fc6d AE |
1059 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1060 | { | |
1061 | const char *snap_name; | |
1062 | ||
1063 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1064 | ||
1065 | /* Skip over names until we find the one we are looking for */ | |
1066 | ||
1067 | snap_name = rbd_dev->header.snap_names; | |
1068 | while (which--) | |
1069 | snap_name += strlen(snap_name) + 1; | |
1070 | ||
1071 | return kstrdup(snap_name, GFP_KERNEL); | |
1072 | } | |
1073 | ||
30d1cff8 AE |
1074 | /* |
1075 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1076 | * Note that result is for snapshots in *descending* order. | |
1077 | */ | |
1078 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1079 | { | |
1080 | u64 snap_id1 = *(u64 *)s1; | |
1081 | u64 snap_id2 = *(u64 *)s2; | |
1082 | ||
1083 | if (snap_id1 < snap_id2) | |
1084 | return 1; | |
1085 | return snap_id1 == snap_id2 ? 0 : -1; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Search a snapshot context to see if the given snapshot id is | |
1090 | * present. | |
1091 | * | |
1092 | * Returns the position of the snapshot id in the array if it's found, | |
1093 | * or BAD_SNAP_INDEX otherwise. | |
1094 | * | |
1095 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1096 | * reverse order, highest snapshot id first. | |
1097 | */ | |
9682fc6d AE |
1098 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1099 | { | |
1100 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1101 | u64 *found; |
9682fc6d | 1102 | |
30d1cff8 AE |
1103 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1104 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1105 | |
30d1cff8 | 1106 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1107 | } |
1108 | ||
2ad3d716 AE |
1109 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1110 | u64 snap_id) | |
9e15b77d | 1111 | { |
54cac61f | 1112 | u32 which; |
da6a6b63 | 1113 | const char *snap_name; |
9e15b77d | 1114 | |
54cac61f AE |
1115 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1116 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1117 | return ERR_PTR(-ENOENT); |
54cac61f | 1118 | |
da6a6b63 JD |
1119 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1120 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1121 | } |
1122 | ||
1123 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1124 | { | |
9e15b77d AE |
1125 | if (snap_id == CEPH_NOSNAP) |
1126 | return RBD_SNAP_HEAD_NAME; | |
1127 | ||
54cac61f AE |
1128 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1129 | if (rbd_dev->image_format == 1) | |
1130 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1131 | |
54cac61f | 1132 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1133 | } |
1134 | ||
2ad3d716 AE |
1135 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1136 | u64 *snap_size) | |
602adf40 | 1137 | { |
2ad3d716 AE |
1138 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1139 | if (snap_id == CEPH_NOSNAP) { | |
1140 | *snap_size = rbd_dev->header.image_size; | |
1141 | } else if (rbd_dev->image_format == 1) { | |
1142 | u32 which; | |
602adf40 | 1143 | |
2ad3d716 AE |
1144 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1145 | if (which == BAD_SNAP_INDEX) | |
1146 | return -ENOENT; | |
e86924a8 | 1147 | |
2ad3d716 AE |
1148 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1149 | } else { | |
1150 | u64 size = 0; | |
1151 | int ret; | |
1152 | ||
1153 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1154 | if (ret) | |
1155 | return ret; | |
1156 | ||
1157 | *snap_size = size; | |
1158 | } | |
1159 | return 0; | |
602adf40 YS |
1160 | } |
1161 | ||
2ad3d716 AE |
1162 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1163 | u64 *snap_features) | |
602adf40 | 1164 | { |
2ad3d716 AE |
1165 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1166 | if (snap_id == CEPH_NOSNAP) { | |
1167 | *snap_features = rbd_dev->header.features; | |
1168 | } else if (rbd_dev->image_format == 1) { | |
1169 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1170 | } else { |
2ad3d716 AE |
1171 | u64 features = 0; |
1172 | int ret; | |
8b0241f8 | 1173 | |
2ad3d716 AE |
1174 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1175 | if (ret) | |
1176 | return ret; | |
1177 | ||
1178 | *snap_features = features; | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1184 | { | |
8f4b7d98 | 1185 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1186 | u64 size = 0; |
1187 | u64 features = 0; | |
1188 | int ret; | |
1189 | ||
2ad3d716 AE |
1190 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1191 | if (ret) | |
1192 | return ret; | |
1193 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1194 | if (ret) | |
1195 | return ret; | |
1196 | ||
1197 | rbd_dev->mapping.size = size; | |
1198 | rbd_dev->mapping.features = features; | |
1199 | ||
8b0241f8 | 1200 | return 0; |
602adf40 YS |
1201 | } |
1202 | ||
d1cf5788 AE |
1203 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1204 | { | |
1205 | rbd_dev->mapping.size = 0; | |
1206 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1207 | } |
1208 | ||
5359a17d ID |
1209 | static void zero_bvec(struct bio_vec *bv) |
1210 | { | |
1211 | void *buf; | |
1212 | unsigned long flags; | |
1213 | ||
1214 | buf = bvec_kmap_irq(bv, &flags); | |
1215 | memset(buf, 0, bv->bv_len); | |
1216 | flush_dcache_page(bv->bv_page); | |
1217 | bvec_kunmap_irq(buf, &flags); | |
1218 | } | |
1219 | ||
1220 | static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) | |
1221 | { | |
1222 | struct ceph_bio_iter it = *bio_pos; | |
1223 | ||
1224 | ceph_bio_iter_advance(&it, off); | |
1225 | ceph_bio_iter_advance_step(&it, bytes, ({ | |
1226 | zero_bvec(&bv); | |
1227 | })); | |
1228 | } | |
1229 | ||
7e07efb1 ID |
1230 | static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes) |
1231 | { | |
1232 | struct ceph_bvec_iter it = *bvec_pos; | |
1233 | ||
1234 | ceph_bvec_iter_advance(&it, off); | |
1235 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
1236 | zero_bvec(&bv); | |
1237 | })); | |
b9434c5b AE |
1238 | } |
1239 | ||
3da691bf ID |
1240 | /* |
1241 | * Zero a range in @obj_req data buffer defined by a bio (list) or | |
afb97888 | 1242 | * (private) bio_vec array. |
3da691bf ID |
1243 | * |
1244 | * @off is relative to the start of the data buffer. | |
1245 | */ | |
1246 | static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off, | |
1247 | u32 bytes) | |
1248 | { | |
ecc633ca | 1249 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1250 | case OBJ_REQUEST_BIO: |
1251 | zero_bios(&obj_req->bio_pos, off, bytes); | |
1252 | break; | |
1253 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1254 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf ID |
1255 | zero_bvecs(&obj_req->bvec_pos, off, bytes); |
1256 | break; | |
1257 | default: | |
1258 | rbd_assert(0); | |
1259 | } | |
1260 | } | |
1261 | ||
bf0d5f50 AE |
1262 | static void rbd_obj_request_destroy(struct kref *kref); |
1263 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1264 | { | |
1265 | rbd_assert(obj_request != NULL); | |
37206ee5 | 1266 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
2c935bc5 | 1267 | kref_read(&obj_request->kref)); |
bf0d5f50 AE |
1268 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1269 | } | |
1270 | ||
0f2d5be7 AE |
1271 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1272 | { | |
1273 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
2c935bc5 | 1274 | kref_read(&img_request->kref)); |
0f2d5be7 AE |
1275 | kref_get(&img_request->kref); |
1276 | } | |
1277 | ||
bf0d5f50 AE |
1278 | static void rbd_img_request_destroy(struct kref *kref); |
1279 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1280 | { | |
1281 | rbd_assert(img_request != NULL); | |
37206ee5 | 1282 | dout("%s: img %p (was %d)\n", __func__, img_request, |
2c935bc5 | 1283 | kref_read(&img_request->kref)); |
e93aca0a | 1284 | kref_put(&img_request->kref, rbd_img_request_destroy); |
bf0d5f50 AE |
1285 | } |
1286 | ||
1287 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1288 | struct rbd_obj_request *obj_request) | |
1289 | { | |
25dcf954 AE |
1290 | rbd_assert(obj_request->img_request == NULL); |
1291 | ||
b155e86c | 1292 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1293 | obj_request->img_request = img_request; |
25dcf954 | 1294 | img_request->obj_request_count++; |
7114edac | 1295 | img_request->pending_count++; |
15961b44 | 1296 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
bf0d5f50 AE |
1297 | } |
1298 | ||
1299 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1300 | struct rbd_obj_request *obj_request) | |
1301 | { | |
15961b44 | 1302 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
43df3d35 | 1303 | list_del(&obj_request->ex.oe_item); |
25dcf954 AE |
1304 | rbd_assert(img_request->obj_request_count > 0); |
1305 | img_request->obj_request_count--; | |
bf0d5f50 | 1306 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 AE |
1307 | rbd_obj_request_put(obj_request); |
1308 | } | |
1309 | ||
980917fc | 1310 | static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1311 | { |
980917fc ID |
1312 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
1313 | ||
a90bb0c1 | 1314 | dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
43df3d35 ID |
1315 | obj_request, obj_request->ex.oe_objno, obj_request->ex.oe_off, |
1316 | obj_request->ex.oe_len, osd_req); | |
980917fc | 1317 | ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
bf0d5f50 AE |
1318 | } |
1319 | ||
0c425248 AE |
1320 | /* |
1321 | * The default/initial value for all image request flags is 0. Each | |
1322 | * is conditionally set to 1 at image request initialization time | |
1323 | * and currently never change thereafter. | |
1324 | */ | |
d0b2e944 AE |
1325 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1326 | { | |
1327 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1328 | smp_mb(); | |
1329 | } | |
1330 | ||
a2acd00e AE |
1331 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1332 | { | |
1333 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1334 | smp_mb(); | |
1335 | } | |
1336 | ||
d0b2e944 AE |
1337 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1338 | { | |
1339 | smp_mb(); | |
1340 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1341 | } | |
1342 | ||
3da691bf ID |
1343 | static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req) |
1344 | { | |
1345 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1346 | ||
43df3d35 ID |
1347 | return !obj_req->ex.oe_off && |
1348 | obj_req->ex.oe_len == rbd_dev->layout.object_size; | |
3da691bf ID |
1349 | } |
1350 | ||
1351 | static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req) | |
1352 | { | |
1353 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1354 | ||
43df3d35 | 1355 | return obj_req->ex.oe_off + obj_req->ex.oe_len == |
3da691bf ID |
1356 | rbd_dev->layout.object_size; |
1357 | } | |
1358 | ||
86bd7998 ID |
1359 | static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req) |
1360 | { | |
1361 | return ceph_file_extents_bytes(obj_req->img_extents, | |
1362 | obj_req->num_img_extents); | |
1363 | } | |
1364 | ||
3da691bf ID |
1365 | static bool rbd_img_is_write(struct rbd_img_request *img_req) |
1366 | { | |
9bb0248d | 1367 | switch (img_req->op_type) { |
3da691bf ID |
1368 | case OBJ_OP_READ: |
1369 | return false; | |
1370 | case OBJ_OP_WRITE: | |
1371 | case OBJ_OP_DISCARD: | |
1372 | return true; | |
1373 | default: | |
1374 | rbd_assert(0); | |
1375 | } | |
1376 | } | |
1377 | ||
3da691bf ID |
1378 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); |
1379 | ||
85e084fe | 1380 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 | 1381 | { |
3da691bf | 1382 | struct rbd_obj_request *obj_req = osd_req->r_priv; |
bf0d5f50 | 1383 | |
3da691bf ID |
1384 | dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req, |
1385 | osd_req->r_result, obj_req); | |
1386 | rbd_assert(osd_req == obj_req->osd_req); | |
0ccd5926 | 1387 | |
3da691bf ID |
1388 | obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0; |
1389 | if (!obj_req->result && !rbd_img_is_write(obj_req->img_request)) | |
1390 | obj_req->xferred = osd_req->r_result; | |
1391 | else | |
1392 | /* | |
1393 | * Writes aren't allowed to return a data payload. In some | |
1394 | * guarded write cases (e.g. stat + zero on an empty object) | |
1395 | * a stat response makes it through, but we don't care. | |
1396 | */ | |
1397 | obj_req->xferred = 0; | |
bf0d5f50 | 1398 | |
3da691bf | 1399 | rbd_obj_handle_request(obj_req); |
bf0d5f50 AE |
1400 | } |
1401 | ||
9d4df01f | 1402 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 | 1403 | { |
8c042b0d | 1404 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1405 | |
a162b308 | 1406 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
7c84883a | 1407 | osd_req->r_snapid = obj_request->img_request->snap_id; |
9d4df01f AE |
1408 | } |
1409 | ||
1410 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1411 | { | |
9d4df01f | 1412 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1413 | |
a162b308 | 1414 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE; |
1134e091 | 1415 | ktime_get_real_ts(&osd_req->r_mtime); |
43df3d35 | 1416 | osd_req->r_data_offset = obj_request->ex.oe_off; |
430c28c3 AE |
1417 | } |
1418 | ||
bc81207e | 1419 | static struct ceph_osd_request * |
a162b308 | 1420 | rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops) |
bc81207e | 1421 | { |
a162b308 ID |
1422 | struct rbd_img_request *img_req = obj_req->img_request; |
1423 | struct rbd_device *rbd_dev = img_req->rbd_dev; | |
bc81207e ID |
1424 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1425 | struct ceph_osd_request *req; | |
a90bb0c1 ID |
1426 | const char *name_format = rbd_dev->image_format == 1 ? |
1427 | RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; | |
bc81207e | 1428 | |
a162b308 ID |
1429 | req = ceph_osdc_alloc_request(osdc, |
1430 | (rbd_img_is_write(img_req) ? img_req->snapc : NULL), | |
1431 | num_ops, false, GFP_NOIO); | |
bc81207e ID |
1432 | if (!req) |
1433 | return NULL; | |
1434 | ||
bc81207e | 1435 | req->r_callback = rbd_osd_req_callback; |
a162b308 | 1436 | req->r_priv = obj_req; |
bc81207e ID |
1437 | |
1438 | req->r_base_oloc.pool = rbd_dev->layout.pool_id; | |
a90bb0c1 | 1439 | if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
43df3d35 | 1440 | rbd_dev->header.object_prefix, obj_req->ex.oe_objno)) |
bc81207e ID |
1441 | goto err_req; |
1442 | ||
1443 | if (ceph_osdc_alloc_messages(req, GFP_NOIO)) | |
1444 | goto err_req; | |
1445 | ||
1446 | return req; | |
1447 | ||
1448 | err_req: | |
1449 | ceph_osdc_put_request(req); | |
1450 | return NULL; | |
1451 | } | |
1452 | ||
bf0d5f50 AE |
1453 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1454 | { | |
1455 | ceph_osdc_put_request(osd_req); | |
1456 | } | |
1457 | ||
ecc633ca | 1458 | static struct rbd_obj_request *rbd_obj_request_create(void) |
bf0d5f50 AE |
1459 | { |
1460 | struct rbd_obj_request *obj_request; | |
bf0d5f50 | 1461 | |
5a60e876 | 1462 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
6c696d85 | 1463 | if (!obj_request) |
f907ad55 | 1464 | return NULL; |
f907ad55 | 1465 | |
43df3d35 | 1466 | ceph_object_extent_init(&obj_request->ex); |
bf0d5f50 AE |
1467 | kref_init(&obj_request->kref); |
1468 | ||
67e2b652 | 1469 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1470 | return obj_request; |
1471 | } | |
1472 | ||
1473 | static void rbd_obj_request_destroy(struct kref *kref) | |
1474 | { | |
1475 | struct rbd_obj_request *obj_request; | |
7e07efb1 | 1476 | u32 i; |
bf0d5f50 AE |
1477 | |
1478 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1479 | ||
37206ee5 AE |
1480 | dout("%s: obj %p\n", __func__, obj_request); |
1481 | ||
bf0d5f50 AE |
1482 | if (obj_request->osd_req) |
1483 | rbd_osd_req_destroy(obj_request->osd_req); | |
1484 | ||
ecc633ca | 1485 | switch (obj_request->img_request->data_type) { |
9969ebc5 | 1486 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1487 | case OBJ_REQUEST_BIO: |
7e07efb1 | 1488 | case OBJ_REQUEST_BVECS: |
5359a17d | 1489 | break; /* Nothing to do */ |
afb97888 ID |
1490 | case OBJ_REQUEST_OWN_BVECS: |
1491 | kfree(obj_request->bvec_pos.bvecs); | |
1492 | break; | |
7e07efb1 ID |
1493 | default: |
1494 | rbd_assert(0); | |
bf0d5f50 AE |
1495 | } |
1496 | ||
86bd7998 | 1497 | kfree(obj_request->img_extents); |
7e07efb1 ID |
1498 | if (obj_request->copyup_bvecs) { |
1499 | for (i = 0; i < obj_request->copyup_bvec_count; i++) { | |
1500 | if (obj_request->copyup_bvecs[i].bv_page) | |
1501 | __free_page(obj_request->copyup_bvecs[i].bv_page); | |
1502 | } | |
1503 | kfree(obj_request->copyup_bvecs); | |
1504 | } | |
f9dcbc44 | 1505 | |
868311b1 | 1506 | kmem_cache_free(rbd_obj_request_cache, obj_request); |
bf0d5f50 AE |
1507 | } |
1508 | ||
fb65d228 AE |
1509 | /* It's OK to call this for a device with no parent */ |
1510 | ||
1511 | static void rbd_spec_put(struct rbd_spec *spec); | |
1512 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1513 | { | |
1514 | rbd_dev_remove_parent(rbd_dev); | |
1515 | rbd_spec_put(rbd_dev->parent_spec); | |
1516 | rbd_dev->parent_spec = NULL; | |
1517 | rbd_dev->parent_overlap = 0; | |
1518 | } | |
1519 | ||
a2acd00e AE |
1520 | /* |
1521 | * Parent image reference counting is used to determine when an | |
1522 | * image's parent fields can be safely torn down--after there are no | |
1523 | * more in-flight requests to the parent image. When the last | |
1524 | * reference is dropped, cleaning them up is safe. | |
1525 | */ | |
1526 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
1527 | { | |
1528 | int counter; | |
1529 | ||
1530 | if (!rbd_dev->parent_spec) | |
1531 | return; | |
1532 | ||
1533 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
1534 | if (counter > 0) | |
1535 | return; | |
1536 | ||
1537 | /* Last reference; clean up parent data structures */ | |
1538 | ||
1539 | if (!counter) | |
1540 | rbd_dev_unparent(rbd_dev); | |
1541 | else | |
9584d508 | 1542 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
1543 | } |
1544 | ||
1545 | /* | |
1546 | * If an image has a non-zero parent overlap, get a reference to its | |
1547 | * parent. | |
1548 | * | |
1549 | * Returns true if the rbd device has a parent with a non-zero | |
1550 | * overlap and a reference for it was successfully taken, or | |
1551 | * false otherwise. | |
1552 | */ | |
1553 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
1554 | { | |
ae43e9d0 | 1555 | int counter = 0; |
a2acd00e AE |
1556 | |
1557 | if (!rbd_dev->parent_spec) | |
1558 | return false; | |
1559 | ||
ae43e9d0 ID |
1560 | down_read(&rbd_dev->header_rwsem); |
1561 | if (rbd_dev->parent_overlap) | |
1562 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
1563 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
1564 | |
1565 | if (counter < 0) | |
9584d508 | 1566 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 1567 | |
ae43e9d0 | 1568 | return counter > 0; |
a2acd00e AE |
1569 | } |
1570 | ||
bf0d5f50 AE |
1571 | /* |
1572 | * Caller is responsible for filling in the list of object requests | |
1573 | * that comprises the image request, and the Linux request pointer | |
1574 | * (if there is one). | |
1575 | */ | |
cc344fa1 AE |
1576 | static struct rbd_img_request *rbd_img_request_create( |
1577 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1578 | enum obj_operation_type op_type, |
4e752f0a | 1579 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
1580 | { |
1581 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1582 | |
a0c5895b | 1583 | img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
1584 | if (!img_request) |
1585 | return NULL; | |
1586 | ||
bf0d5f50 | 1587 | img_request->rbd_dev = rbd_dev; |
9bb0248d | 1588 | img_request->op_type = op_type; |
9bb0248d | 1589 | if (!rbd_img_is_write(img_request)) |
bf0d5f50 | 1590 | img_request->snap_id = rbd_dev->spec->snap_id; |
9bb0248d ID |
1591 | else |
1592 | img_request->snapc = snapc; | |
1593 | ||
a2acd00e | 1594 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 1595 | img_request_layered_set(img_request); |
a0c5895b | 1596 | |
bf0d5f50 | 1597 | spin_lock_init(&img_request->completion_lock); |
43df3d35 | 1598 | INIT_LIST_HEAD(&img_request->object_extents); |
bf0d5f50 AE |
1599 | kref_init(&img_request->kref); |
1600 | ||
dfd9875f ID |
1601 | dout("%s: rbd_dev %p %s -> img %p\n", __func__, rbd_dev, |
1602 | obj_op_name(op_type), img_request); | |
bf0d5f50 AE |
1603 | return img_request; |
1604 | } | |
1605 | ||
1606 | static void rbd_img_request_destroy(struct kref *kref) | |
1607 | { | |
1608 | struct rbd_img_request *img_request; | |
1609 | struct rbd_obj_request *obj_request; | |
1610 | struct rbd_obj_request *next_obj_request; | |
1611 | ||
1612 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1613 | ||
37206ee5 AE |
1614 | dout("%s: img %p\n", __func__, img_request); |
1615 | ||
bf0d5f50 AE |
1616 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1617 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1618 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1619 | |
a2acd00e AE |
1620 | if (img_request_layered_test(img_request)) { |
1621 | img_request_layered_clear(img_request); | |
1622 | rbd_dev_parent_put(img_request->rbd_dev); | |
1623 | } | |
1624 | ||
9bb0248d | 1625 | if (rbd_img_is_write(img_request)) |
812164f8 | 1626 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1627 | |
1c2a9dfe | 1628 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1629 | } |
1630 | ||
86bd7998 ID |
1631 | static void prune_extents(struct ceph_file_extent *img_extents, |
1632 | u32 *num_img_extents, u64 overlap) | |
1633 | { | |
1634 | u32 cnt = *num_img_extents; | |
1635 | ||
1636 | /* drop extents completely beyond the overlap */ | |
1637 | while (cnt && img_extents[cnt - 1].fe_off >= overlap) | |
1638 | cnt--; | |
1639 | ||
1640 | if (cnt) { | |
1641 | struct ceph_file_extent *ex = &img_extents[cnt - 1]; | |
1642 | ||
1643 | /* trim final overlapping extent */ | |
1644 | if (ex->fe_off + ex->fe_len > overlap) | |
1645 | ex->fe_len = overlap - ex->fe_off; | |
1646 | } | |
1647 | ||
1648 | *num_img_extents = cnt; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Determine the byte range(s) covered by either just the object extent | |
1653 | * or the entire object in the parent image. | |
1654 | */ | |
1655 | static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req, | |
1656 | bool entire) | |
1657 | { | |
1658 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1659 | int ret; | |
1660 | ||
1661 | if (!rbd_dev->parent_overlap) | |
1662 | return 0; | |
1663 | ||
1664 | ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno, | |
1665 | entire ? 0 : obj_req->ex.oe_off, | |
1666 | entire ? rbd_dev->layout.object_size : | |
1667 | obj_req->ex.oe_len, | |
1668 | &obj_req->img_extents, | |
1669 | &obj_req->num_img_extents); | |
1670 | if (ret) | |
1671 | return ret; | |
1672 | ||
1673 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
1674 | rbd_dev->parent_overlap); | |
1675 | return 0; | |
1676 | } | |
1677 | ||
3da691bf ID |
1678 | static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) |
1679 | { | |
ecc633ca | 1680 | switch (obj_req->img_request->data_type) { |
3da691bf ID |
1681 | case OBJ_REQUEST_BIO: |
1682 | osd_req_op_extent_osd_data_bio(obj_req->osd_req, which, | |
1683 | &obj_req->bio_pos, | |
43df3d35 | 1684 | obj_req->ex.oe_len); |
3da691bf ID |
1685 | break; |
1686 | case OBJ_REQUEST_BVECS: | |
afb97888 | 1687 | case OBJ_REQUEST_OWN_BVECS: |
3da691bf | 1688 | rbd_assert(obj_req->bvec_pos.iter.bi_size == |
43df3d35 | 1689 | obj_req->ex.oe_len); |
afb97888 | 1690 | rbd_assert(obj_req->bvec_idx == obj_req->bvec_count); |
3da691bf ID |
1691 | osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which, |
1692 | &obj_req->bvec_pos); | |
1693 | break; | |
1694 | default: | |
1695 | rbd_assert(0); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | static int rbd_obj_setup_read(struct rbd_obj_request *obj_req) | |
1700 | { | |
a162b308 | 1701 | obj_req->osd_req = rbd_osd_req_create(obj_req, 1); |
3da691bf ID |
1702 | if (!obj_req->osd_req) |
1703 | return -ENOMEM; | |
1704 | ||
1705 | osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ, | |
43df3d35 | 1706 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf ID |
1707 | rbd_osd_req_setup_data(obj_req, 0); |
1708 | ||
1709 | rbd_osd_req_format_read(obj_req); | |
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req, | |
1714 | unsigned int which) | |
1715 | { | |
1716 | struct page **pages; | |
1717 | ||
1718 | /* | |
1719 | * The response data for a STAT call consists of: | |
1720 | * le64 length; | |
1721 | * struct { | |
1722 | * le32 tv_sec; | |
1723 | * le32 tv_nsec; | |
1724 | * } mtime; | |
1725 | */ | |
1726 | pages = ceph_alloc_page_vector(1, GFP_NOIO); | |
1727 | if (IS_ERR(pages)) | |
1728 | return PTR_ERR(pages); | |
1729 | ||
1730 | osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0); | |
1731 | osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages, | |
1732 | 8 + sizeof(struct ceph_timespec), | |
1733 | 0, false, true); | |
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req, | |
1738 | unsigned int which) | |
1739 | { | |
1740 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
1741 | u16 opcode; | |
1742 | ||
1743 | osd_req_op_alloc_hint_init(obj_req->osd_req, which++, | |
1744 | rbd_dev->layout.object_size, | |
1745 | rbd_dev->layout.object_size); | |
1746 | ||
1747 | if (rbd_obj_is_entire(obj_req)) | |
1748 | opcode = CEPH_OSD_OP_WRITEFULL; | |
1749 | else | |
1750 | opcode = CEPH_OSD_OP_WRITE; | |
1751 | ||
1752 | osd_req_op_extent_init(obj_req->osd_req, which, opcode, | |
43df3d35 | 1753 | obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0); |
3da691bf ID |
1754 | rbd_osd_req_setup_data(obj_req, which++); |
1755 | ||
1756 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
1757 | rbd_osd_req_format_write(obj_req); | |
1758 | } | |
1759 | ||
1760 | static int rbd_obj_setup_write(struct rbd_obj_request *obj_req) | |
1761 | { | |
3da691bf ID |
1762 | unsigned int num_osd_ops, which = 0; |
1763 | int ret; | |
1764 | ||
86bd7998 ID |
1765 | /* reverse map the entire object onto the parent */ |
1766 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1767 | if (ret) | |
1768 | return ret; | |
1769 | ||
1770 | if (obj_req->num_img_extents) { | |
3da691bf ID |
1771 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1772 | num_osd_ops = 3; /* stat + setallochint + write/writefull */ | |
1773 | } else { | |
1774 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1775 | num_osd_ops = 2; /* setallochint + write/writefull */ | |
1776 | } | |
1777 | ||
a162b308 | 1778 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1779 | if (!obj_req->osd_req) |
1780 | return -ENOMEM; | |
1781 | ||
86bd7998 | 1782 | if (obj_req->num_img_extents) { |
3da691bf ID |
1783 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1784 | if (ret) | |
1785 | return ret; | |
1786 | } | |
1787 | ||
1788 | __rbd_obj_setup_write(obj_req, which); | |
1789 | return 0; | |
1790 | } | |
1791 | ||
1792 | static void __rbd_obj_setup_discard(struct rbd_obj_request *obj_req, | |
1793 | unsigned int which) | |
1794 | { | |
1795 | u16 opcode; | |
1796 | ||
1797 | if (rbd_obj_is_entire(obj_req)) { | |
86bd7998 | 1798 | if (obj_req->num_img_extents) { |
2bb1e56e ID |
1799 | osd_req_op_init(obj_req->osd_req, which++, |
1800 | CEPH_OSD_OP_CREATE, 0); | |
3da691bf ID |
1801 | opcode = CEPH_OSD_OP_TRUNCATE; |
1802 | } else { | |
1803 | osd_req_op_init(obj_req->osd_req, which++, | |
1804 | CEPH_OSD_OP_DELETE, 0); | |
1805 | opcode = 0; | |
1806 | } | |
1807 | } else if (rbd_obj_is_tail(obj_req)) { | |
1808 | opcode = CEPH_OSD_OP_TRUNCATE; | |
1809 | } else { | |
1810 | opcode = CEPH_OSD_OP_ZERO; | |
1811 | } | |
1812 | ||
1813 | if (opcode) | |
1814 | osd_req_op_extent_init(obj_req->osd_req, which++, opcode, | |
43df3d35 | 1815 | obj_req->ex.oe_off, obj_req->ex.oe_len, |
3da691bf ID |
1816 | 0, 0); |
1817 | ||
1818 | rbd_assert(which == obj_req->osd_req->r_num_ops); | |
1819 | rbd_osd_req_format_write(obj_req); | |
1820 | } | |
1821 | ||
1822 | static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req) | |
1823 | { | |
3da691bf ID |
1824 | unsigned int num_osd_ops, which = 0; |
1825 | int ret; | |
1826 | ||
86bd7998 ID |
1827 | /* reverse map the entire object onto the parent */ |
1828 | ret = rbd_obj_calc_img_extents(obj_req, true); | |
1829 | if (ret) | |
1830 | return ret; | |
1831 | ||
3da691bf ID |
1832 | if (rbd_obj_is_entire(obj_req)) { |
1833 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2bb1e56e ID |
1834 | if (obj_req->num_img_extents) |
1835 | num_osd_ops = 2; /* create + truncate */ | |
1836 | else | |
1837 | num_osd_ops = 1; /* delete */ | |
3da691bf | 1838 | } else { |
86bd7998 | 1839 | if (obj_req->num_img_extents) { |
3da691bf ID |
1840 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; |
1841 | num_osd_ops = 2; /* stat + truncate/zero */ | |
1842 | } else { | |
1843 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
1844 | num_osd_ops = 1; /* truncate/zero */ | |
1845 | } | |
1846 | } | |
1847 | ||
a162b308 | 1848 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
1849 | if (!obj_req->osd_req) |
1850 | return -ENOMEM; | |
1851 | ||
86bd7998 | 1852 | if (!rbd_obj_is_entire(obj_req) && obj_req->num_img_extents) { |
3da691bf ID |
1853 | ret = __rbd_obj_setup_stat(obj_req, which++); |
1854 | if (ret) | |
1855 | return ret; | |
1856 | } | |
1857 | ||
1858 | __rbd_obj_setup_discard(obj_req, which); | |
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * For each object request in @img_req, allocate an OSD request, add | |
1864 | * individual OSD ops and prepare them for submission. The number of | |
1865 | * OSD ops depends on op_type and the overlap point (if any). | |
1866 | */ | |
1867 | static int __rbd_img_fill_request(struct rbd_img_request *img_req) | |
1868 | { | |
1869 | struct rbd_obj_request *obj_req; | |
1870 | int ret; | |
1871 | ||
1872 | for_each_obj_request(img_req, obj_req) { | |
9bb0248d | 1873 | switch (img_req->op_type) { |
3da691bf ID |
1874 | case OBJ_OP_READ: |
1875 | ret = rbd_obj_setup_read(obj_req); | |
1876 | break; | |
1877 | case OBJ_OP_WRITE: | |
1878 | ret = rbd_obj_setup_write(obj_req); | |
1879 | break; | |
1880 | case OBJ_OP_DISCARD: | |
1881 | ret = rbd_obj_setup_discard(obj_req); | |
1882 | break; | |
1883 | default: | |
1884 | rbd_assert(0); | |
1885 | } | |
1886 | if (ret) | |
1887 | return ret; | |
1888 | } | |
1889 | ||
1890 | return 0; | |
1891 | } | |
1892 | ||
5a237819 ID |
1893 | union rbd_img_fill_iter { |
1894 | struct ceph_bio_iter bio_iter; | |
1895 | struct ceph_bvec_iter bvec_iter; | |
1896 | }; | |
1897 | ||
1898 | struct rbd_img_fill_ctx { | |
1899 | enum obj_request_type pos_type; | |
1900 | union rbd_img_fill_iter *pos; | |
1901 | union rbd_img_fill_iter iter; | |
1902 | ceph_object_extent_fn_t set_pos_fn; | |
afb97888 ID |
1903 | ceph_object_extent_fn_t count_fn; |
1904 | ceph_object_extent_fn_t copy_fn; | |
5a237819 ID |
1905 | }; |
1906 | ||
1907 | static struct ceph_object_extent *alloc_object_extent(void *arg) | |
1908 | { | |
1909 | struct rbd_img_request *img_req = arg; | |
1910 | struct rbd_obj_request *obj_req; | |
1911 | ||
1912 | obj_req = rbd_obj_request_create(); | |
1913 | if (!obj_req) | |
1914 | return NULL; | |
1915 | ||
1916 | rbd_img_obj_request_add(img_req, obj_req); | |
1917 | return &obj_req->ex; | |
1918 | } | |
1919 | ||
afb97888 ID |
1920 | /* |
1921 | * While su != os && sc == 1 is technically not fancy (it's the same | |
1922 | * layout as su == os && sc == 1), we can't use the nocopy path for it | |
1923 | * because ->set_pos_fn() should be called only once per object. | |
1924 | * ceph_file_to_extents() invokes action_fn once per stripe unit, so | |
1925 | * treat su != os && sc == 1 as fancy. | |
1926 | */ | |
1927 | static bool rbd_layout_is_fancy(struct ceph_file_layout *l) | |
1928 | { | |
1929 | return l->stripe_unit != l->object_size; | |
1930 | } | |
1931 | ||
1932 | static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req, | |
1933 | struct ceph_file_extent *img_extents, | |
1934 | u32 num_img_extents, | |
1935 | struct rbd_img_fill_ctx *fctx) | |
1936 | { | |
1937 | u32 i; | |
1938 | int ret; | |
1939 | ||
1940 | img_req->data_type = fctx->pos_type; | |
1941 | ||
1942 | /* | |
1943 | * Create object requests and set each object request's starting | |
1944 | * position in the provided bio (list) or bio_vec array. | |
1945 | */ | |
1946 | fctx->iter = *fctx->pos; | |
1947 | for (i = 0; i < num_img_extents; i++) { | |
1948 | ret = ceph_file_to_extents(&img_req->rbd_dev->layout, | |
1949 | img_extents[i].fe_off, | |
1950 | img_extents[i].fe_len, | |
1951 | &img_req->object_extents, | |
1952 | alloc_object_extent, img_req, | |
1953 | fctx->set_pos_fn, &fctx->iter); | |
1954 | if (ret) | |
1955 | return ret; | |
1956 | } | |
1957 | ||
1958 | return __rbd_img_fill_request(img_req); | |
1959 | } | |
1960 | ||
5a237819 ID |
1961 | /* |
1962 | * Map a list of image extents to a list of object extents, create the | |
1963 | * corresponding object requests (normally each to a different object, | |
1964 | * but not always) and add them to @img_req. For each object request, | |
afb97888 | 1965 | * set up its data descriptor to point to the corresponding chunk(s) of |
5a237819 ID |
1966 | * @fctx->pos data buffer. |
1967 | * | |
afb97888 ID |
1968 | * Because ceph_file_to_extents() will merge adjacent object extents |
1969 | * together, each object request's data descriptor may point to multiple | |
1970 | * different chunks of @fctx->pos data buffer. | |
1971 | * | |
5a237819 ID |
1972 | * @fctx->pos data buffer is assumed to be large enough. |
1973 | */ | |
1974 | static int rbd_img_fill_request(struct rbd_img_request *img_req, | |
1975 | struct ceph_file_extent *img_extents, | |
1976 | u32 num_img_extents, | |
1977 | struct rbd_img_fill_ctx *fctx) | |
1978 | { | |
afb97888 ID |
1979 | struct rbd_device *rbd_dev = img_req->rbd_dev; |
1980 | struct rbd_obj_request *obj_req; | |
5a237819 ID |
1981 | u32 i; |
1982 | int ret; | |
1983 | ||
afb97888 ID |
1984 | if (fctx->pos_type == OBJ_REQUEST_NODATA || |
1985 | !rbd_layout_is_fancy(&rbd_dev->layout)) | |
1986 | return rbd_img_fill_request_nocopy(img_req, img_extents, | |
1987 | num_img_extents, fctx); | |
1988 | ||
1989 | img_req->data_type = OBJ_REQUEST_OWN_BVECS; | |
5a237819 ID |
1990 | |
1991 | /* | |
afb97888 ID |
1992 | * Create object requests and determine ->bvec_count for each object |
1993 | * request. Note that ->bvec_count sum over all object requests may | |
1994 | * be greater than the number of bio_vecs in the provided bio (list) | |
1995 | * or bio_vec array because when mapped, those bio_vecs can straddle | |
1996 | * stripe unit boundaries. | |
5a237819 ID |
1997 | */ |
1998 | fctx->iter = *fctx->pos; | |
1999 | for (i = 0; i < num_img_extents; i++) { | |
afb97888 | 2000 | ret = ceph_file_to_extents(&rbd_dev->layout, |
5a237819 ID |
2001 | img_extents[i].fe_off, |
2002 | img_extents[i].fe_len, | |
2003 | &img_req->object_extents, | |
2004 | alloc_object_extent, img_req, | |
afb97888 ID |
2005 | fctx->count_fn, &fctx->iter); |
2006 | if (ret) | |
2007 | return ret; | |
2008 | } | |
2009 | ||
2010 | for_each_obj_request(img_req, obj_req) { | |
2011 | obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count, | |
2012 | sizeof(*obj_req->bvec_pos.bvecs), | |
2013 | GFP_NOIO); | |
2014 | if (!obj_req->bvec_pos.bvecs) | |
2015 | return -ENOMEM; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Fill in each object request's private bio_vec array, splitting and | |
2020 | * rearranging the provided bio_vecs in stripe unit chunks as needed. | |
2021 | */ | |
2022 | fctx->iter = *fctx->pos; | |
2023 | for (i = 0; i < num_img_extents; i++) { | |
2024 | ret = ceph_iterate_extents(&rbd_dev->layout, | |
2025 | img_extents[i].fe_off, | |
2026 | img_extents[i].fe_len, | |
2027 | &img_req->object_extents, | |
2028 | fctx->copy_fn, &fctx->iter); | |
5a237819 ID |
2029 | if (ret) |
2030 | return ret; | |
2031 | } | |
2032 | ||
2033 | return __rbd_img_fill_request(img_req); | |
2034 | } | |
2035 | ||
2036 | static int rbd_img_fill_nodata(struct rbd_img_request *img_req, | |
2037 | u64 off, u64 len) | |
2038 | { | |
2039 | struct ceph_file_extent ex = { off, len }; | |
2040 | union rbd_img_fill_iter dummy; | |
2041 | struct rbd_img_fill_ctx fctx = { | |
2042 | .pos_type = OBJ_REQUEST_NODATA, | |
2043 | .pos = &dummy, | |
2044 | }; | |
2045 | ||
2046 | return rbd_img_fill_request(img_req, &ex, 1, &fctx); | |
2047 | } | |
2048 | ||
2049 | static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2050 | { | |
2051 | struct rbd_obj_request *obj_req = | |
2052 | container_of(ex, struct rbd_obj_request, ex); | |
2053 | struct ceph_bio_iter *it = arg; | |
2054 | ||
2055 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); | |
2056 | obj_req->bio_pos = *it; | |
2057 | ceph_bio_iter_advance(it, bytes); | |
2058 | } | |
2059 | ||
afb97888 ID |
2060 | static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2061 | { | |
2062 | struct rbd_obj_request *obj_req = | |
2063 | container_of(ex, struct rbd_obj_request, ex); | |
2064 | struct ceph_bio_iter *it = arg; | |
2065 | ||
2066 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); | |
2067 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2068 | obj_req->bvec_count++; | |
2069 | })); | |
2070 | ||
2071 | } | |
2072 | ||
2073 | static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2074 | { | |
2075 | struct rbd_obj_request *obj_req = | |
2076 | container_of(ex, struct rbd_obj_request, ex); | |
2077 | struct ceph_bio_iter *it = arg; | |
2078 | ||
2079 | dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes); | |
2080 | ceph_bio_iter_advance_step(it, bytes, ({ | |
2081 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2082 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2083 | })); | |
2084 | } | |
2085 | ||
5a237819 ID |
2086 | static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req, |
2087 | struct ceph_file_extent *img_extents, | |
2088 | u32 num_img_extents, | |
2089 | struct ceph_bio_iter *bio_pos) | |
2090 | { | |
2091 | struct rbd_img_fill_ctx fctx = { | |
2092 | .pos_type = OBJ_REQUEST_BIO, | |
2093 | .pos = (union rbd_img_fill_iter *)bio_pos, | |
2094 | .set_pos_fn = set_bio_pos, | |
afb97888 ID |
2095 | .count_fn = count_bio_bvecs, |
2096 | .copy_fn = copy_bio_bvecs, | |
5a237819 ID |
2097 | }; |
2098 | ||
2099 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, | |
2100 | &fctx); | |
2101 | } | |
2102 | ||
2103 | static int rbd_img_fill_from_bio(struct rbd_img_request *img_req, | |
2104 | u64 off, u64 len, struct bio *bio) | |
2105 | { | |
2106 | struct ceph_file_extent ex = { off, len }; | |
2107 | struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter }; | |
2108 | ||
2109 | return __rbd_img_fill_from_bio(img_req, &ex, 1, &it); | |
2110 | } | |
2111 | ||
2112 | static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2113 | { | |
2114 | struct rbd_obj_request *obj_req = | |
2115 | container_of(ex, struct rbd_obj_request, ex); | |
2116 | struct ceph_bvec_iter *it = arg; | |
2117 | ||
2118 | obj_req->bvec_pos = *it; | |
2119 | ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes); | |
2120 | ceph_bvec_iter_advance(it, bytes); | |
2121 | } | |
2122 | ||
afb97888 ID |
2123 | static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) |
2124 | { | |
2125 | struct rbd_obj_request *obj_req = | |
2126 | container_of(ex, struct rbd_obj_request, ex); | |
2127 | struct ceph_bvec_iter *it = arg; | |
2128 | ||
2129 | ceph_bvec_iter_advance_step(it, bytes, ({ | |
2130 | obj_req->bvec_count++; | |
2131 | })); | |
2132 | } | |
2133 | ||
2134 | static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg) | |
2135 | { | |
2136 | struct rbd_obj_request *obj_req = | |
2137 | container_of(ex, struct rbd_obj_request, ex); | |
2138 | struct ceph_bvec_iter *it = arg; | |
2139 | ||
2140 | ceph_bvec_iter_advance_step(it, bytes, ({ | |
2141 | obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv; | |
2142 | obj_req->bvec_pos.iter.bi_size += bv.bv_len; | |
2143 | })); | |
2144 | } | |
2145 | ||
5a237819 ID |
2146 | static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, |
2147 | struct ceph_file_extent *img_extents, | |
2148 | u32 num_img_extents, | |
2149 | struct ceph_bvec_iter *bvec_pos) | |
2150 | { | |
2151 | struct rbd_img_fill_ctx fctx = { | |
2152 | .pos_type = OBJ_REQUEST_BVECS, | |
2153 | .pos = (union rbd_img_fill_iter *)bvec_pos, | |
2154 | .set_pos_fn = set_bvec_pos, | |
afb97888 ID |
2155 | .count_fn = count_bvecs, |
2156 | .copy_fn = copy_bvecs, | |
5a237819 ID |
2157 | }; |
2158 | ||
2159 | return rbd_img_fill_request(img_req, img_extents, num_img_extents, | |
2160 | &fctx); | |
2161 | } | |
2162 | ||
2163 | static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req, | |
2164 | struct ceph_file_extent *img_extents, | |
2165 | u32 num_img_extents, | |
2166 | struct bio_vec *bvecs) | |
2167 | { | |
2168 | struct ceph_bvec_iter it = { | |
2169 | .bvecs = bvecs, | |
2170 | .iter = { .bi_size = ceph_file_extents_bytes(img_extents, | |
2171 | num_img_extents) }, | |
2172 | }; | |
2173 | ||
2174 | return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents, | |
2175 | &it); | |
2176 | } | |
2177 | ||
efbd1a11 | 2178 | static void rbd_img_request_submit(struct rbd_img_request *img_request) |
bf0d5f50 | 2179 | { |
bf0d5f50 AE |
2180 | struct rbd_obj_request *obj_request; |
2181 | ||
37206ee5 | 2182 | dout("%s: img %p\n", __func__, img_request); |
bf0d5f50 | 2183 | |
663ae2cc | 2184 | rbd_img_request_get(img_request); |
efbd1a11 | 2185 | for_each_obj_request(img_request, obj_request) |
3da691bf | 2186 | rbd_obj_request_submit(obj_request); |
bf0d5f50 | 2187 | |
663ae2cc | 2188 | rbd_img_request_put(img_request); |
bf0d5f50 | 2189 | } |
8b3e1a56 | 2190 | |
86bd7998 | 2191 | static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req) |
3da691bf ID |
2192 | { |
2193 | struct rbd_img_request *img_req = obj_req->img_request; | |
2194 | struct rbd_img_request *child_img_req; | |
2195 | int ret; | |
2196 | ||
e93aca0a ID |
2197 | child_img_req = rbd_img_request_create(img_req->rbd_dev->parent, |
2198 | OBJ_OP_READ, NULL); | |
3da691bf ID |
2199 | if (!child_img_req) |
2200 | return -ENOMEM; | |
2201 | ||
e93aca0a ID |
2202 | __set_bit(IMG_REQ_CHILD, &child_img_req->flags); |
2203 | child_img_req->obj_request = obj_req; | |
2204 | ||
3da691bf | 2205 | if (!rbd_img_is_write(img_req)) { |
ecc633ca | 2206 | switch (img_req->data_type) { |
3da691bf | 2207 | case OBJ_REQUEST_BIO: |
5a237819 ID |
2208 | ret = __rbd_img_fill_from_bio(child_img_req, |
2209 | obj_req->img_extents, | |
2210 | obj_req->num_img_extents, | |
2211 | &obj_req->bio_pos); | |
3da691bf ID |
2212 | break; |
2213 | case OBJ_REQUEST_BVECS: | |
afb97888 | 2214 | case OBJ_REQUEST_OWN_BVECS: |
5a237819 ID |
2215 | ret = __rbd_img_fill_from_bvecs(child_img_req, |
2216 | obj_req->img_extents, | |
2217 | obj_req->num_img_extents, | |
2218 | &obj_req->bvec_pos); | |
3da691bf ID |
2219 | break; |
2220 | default: | |
2221 | rbd_assert(0); | |
2222 | } | |
2223 | } else { | |
5a237819 ID |
2224 | ret = rbd_img_fill_from_bvecs(child_img_req, |
2225 | obj_req->img_extents, | |
2226 | obj_req->num_img_extents, | |
2227 | obj_req->copyup_bvecs); | |
3da691bf ID |
2228 | } |
2229 | if (ret) { | |
2230 | rbd_img_request_put(child_img_req); | |
2231 | return ret; | |
2232 | } | |
2233 | ||
2234 | rbd_img_request_submit(child_img_req); | |
2235 | return 0; | |
2236 | } | |
2237 | ||
2238 | static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req) | |
2239 | { | |
2240 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
2241 | int ret; | |
2242 | ||
2243 | if (obj_req->result == -ENOENT && | |
86bd7998 ID |
2244 | rbd_dev->parent_overlap && !obj_req->tried_parent) { |
2245 | /* reverse map this object extent onto the parent */ | |
2246 | ret = rbd_obj_calc_img_extents(obj_req, false); | |
3da691bf ID |
2247 | if (ret) { |
2248 | obj_req->result = ret; | |
2249 | return true; | |
2250 | } | |
86bd7998 ID |
2251 | |
2252 | if (obj_req->num_img_extents) { | |
2253 | obj_req->tried_parent = true; | |
2254 | ret = rbd_obj_read_from_parent(obj_req); | |
2255 | if (ret) { | |
2256 | obj_req->result = ret; | |
2257 | return true; | |
2258 | } | |
2259 | return false; | |
2260 | } | |
3da691bf ID |
2261 | } |
2262 | ||
2263 | /* | |
2264 | * -ENOENT means a hole in the image -- zero-fill the entire | |
2265 | * length of the request. A short read also implies zero-fill | |
2266 | * to the end of the request. In both cases we update xferred | |
2267 | * count to indicate the whole request was satisfied. | |
2268 | */ | |
2269 | if (obj_req->result == -ENOENT || | |
43df3d35 | 2270 | (!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) { |
3da691bf ID |
2271 | rbd_assert(!obj_req->xferred || !obj_req->result); |
2272 | rbd_obj_zero_range(obj_req, obj_req->xferred, | |
43df3d35 | 2273 | obj_req->ex.oe_len - obj_req->xferred); |
3da691bf | 2274 | obj_req->result = 0; |
43df3d35 | 2275 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2276 | } |
2277 | ||
2278 | return true; | |
2279 | } | |
2280 | ||
2281 | /* | |
2282 | * copyup_bvecs pages are never highmem pages | |
2283 | */ | |
2284 | static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes) | |
2285 | { | |
2286 | struct ceph_bvec_iter it = { | |
2287 | .bvecs = bvecs, | |
2288 | .iter = { .bi_size = bytes }, | |
2289 | }; | |
2290 | ||
2291 | ceph_bvec_iter_advance_step(&it, bytes, ({ | |
2292 | if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0, | |
2293 | bv.bv_len)) | |
2294 | return false; | |
2295 | })); | |
2296 | return true; | |
2297 | } | |
2298 | ||
2299 | static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes) | |
2300 | { | |
3da691bf ID |
2301 | unsigned int num_osd_ops = obj_req->osd_req->r_num_ops; |
2302 | ||
2303 | dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes); | |
2304 | rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT); | |
2305 | rbd_osd_req_destroy(obj_req->osd_req); | |
2306 | ||
2307 | /* | |
2308 | * Create a copyup request with the same number of OSD ops as | |
2309 | * the original request. The original request was stat + op(s), | |
2310 | * the new copyup request will be copyup + the same op(s). | |
2311 | */ | |
a162b308 | 2312 | obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops); |
3da691bf ID |
2313 | if (!obj_req->osd_req) |
2314 | return -ENOMEM; | |
2315 | ||
2316 | /* | |
2317 | * Only send non-zero copyup data to save some I/O and network | |
2318 | * bandwidth -- zero copyup data is equivalent to the object not | |
2319 | * existing. | |
2320 | */ | |
2321 | if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) { | |
2322 | dout("%s obj_req %p detected zeroes\n", __func__, obj_req); | |
2323 | bytes = 0; | |
2324 | } | |
2325 | ||
2326 | osd_req_op_cls_init(obj_req->osd_req, 0, CEPH_OSD_OP_CALL, "rbd", | |
2327 | "copyup"); | |
2328 | osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0, | |
2329 | obj_req->copyup_bvecs, bytes); | |
2330 | ||
9bb0248d | 2331 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2332 | case OBJ_OP_WRITE: |
2333 | __rbd_obj_setup_write(obj_req, 1); | |
2334 | break; | |
2335 | case OBJ_OP_DISCARD: | |
2336 | rbd_assert(!rbd_obj_is_entire(obj_req)); | |
2337 | __rbd_obj_setup_discard(obj_req, 1); | |
2338 | break; | |
2339 | default: | |
2340 | rbd_assert(0); | |
2341 | } | |
2342 | ||
2343 | rbd_obj_request_submit(obj_req); | |
3da691bf ID |
2344 | return 0; |
2345 | } | |
2346 | ||
7e07efb1 ID |
2347 | static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) |
2348 | { | |
2349 | u32 i; | |
2350 | ||
2351 | rbd_assert(!obj_req->copyup_bvecs); | |
2352 | obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap); | |
2353 | obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count, | |
2354 | sizeof(*obj_req->copyup_bvecs), | |
2355 | GFP_NOIO); | |
2356 | if (!obj_req->copyup_bvecs) | |
2357 | return -ENOMEM; | |
2358 | ||
2359 | for (i = 0; i < obj_req->copyup_bvec_count; i++) { | |
2360 | unsigned int len = min(obj_overlap, (u64)PAGE_SIZE); | |
2361 | ||
2362 | obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
2363 | if (!obj_req->copyup_bvecs[i].bv_page) | |
2364 | return -ENOMEM; | |
2365 | ||
2366 | obj_req->copyup_bvecs[i].bv_offset = 0; | |
2367 | obj_req->copyup_bvecs[i].bv_len = len; | |
2368 | obj_overlap -= len; | |
2369 | } | |
2370 | ||
2371 | rbd_assert(!obj_overlap); | |
2372 | return 0; | |
2373 | } | |
2374 | ||
3da691bf ID |
2375 | static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) |
2376 | { | |
2377 | struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; | |
3da691bf ID |
2378 | int ret; |
2379 | ||
86bd7998 ID |
2380 | rbd_assert(obj_req->num_img_extents); |
2381 | prune_extents(obj_req->img_extents, &obj_req->num_img_extents, | |
2382 | rbd_dev->parent_overlap); | |
2383 | if (!obj_req->num_img_extents) { | |
3da691bf ID |
2384 | /* |
2385 | * The overlap has become 0 (most likely because the | |
2386 | * image has been flattened). Use rbd_obj_issue_copyup() | |
2387 | * to re-submit the original write request -- the copyup | |
2388 | * operation itself will be a no-op, since someone must | |
2389 | * have populated the child object while we weren't | |
2390 | * looking. Move to WRITE_FLAT state as we'll be done | |
2391 | * with the operation once the null copyup completes. | |
2392 | */ | |
2393 | obj_req->write_state = RBD_OBJ_WRITE_FLAT; | |
2394 | return rbd_obj_issue_copyup(obj_req, 0); | |
2395 | } | |
2396 | ||
86bd7998 | 2397 | ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req)); |
3da691bf ID |
2398 | if (ret) |
2399 | return ret; | |
2400 | ||
2401 | obj_req->write_state = RBD_OBJ_WRITE_COPYUP; | |
86bd7998 | 2402 | return rbd_obj_read_from_parent(obj_req); |
3da691bf ID |
2403 | } |
2404 | ||
2405 | static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req) | |
2406 | { | |
2407 | int ret; | |
2408 | ||
2409 | again: | |
2410 | switch (obj_req->write_state) { | |
2411 | case RBD_OBJ_WRITE_GUARD: | |
2412 | rbd_assert(!obj_req->xferred); | |
2413 | if (obj_req->result == -ENOENT) { | |
2414 | /* | |
2415 | * The target object doesn't exist. Read the data for | |
2416 | * the entire target object up to the overlap point (if | |
2417 | * any) from the parent, so we can use it for a copyup. | |
2418 | */ | |
2419 | ret = rbd_obj_handle_write_guard(obj_req); | |
2420 | if (ret) { | |
2421 | obj_req->result = ret; | |
2422 | return true; | |
2423 | } | |
2424 | return false; | |
2425 | } | |
2426 | /* fall through */ | |
2427 | case RBD_OBJ_WRITE_FLAT: | |
2428 | if (!obj_req->result) | |
2429 | /* | |
2430 | * There is no such thing as a successful short | |
2431 | * write -- indicate the whole request was satisfied. | |
2432 | */ | |
43df3d35 | 2433 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2434 | return true; |
2435 | case RBD_OBJ_WRITE_COPYUP: | |
2436 | obj_req->write_state = RBD_OBJ_WRITE_GUARD; | |
2437 | if (obj_req->result) | |
2438 | goto again; | |
2439 | ||
2440 | rbd_assert(obj_req->xferred); | |
2441 | ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred); | |
2442 | if (ret) { | |
2443 | obj_req->result = ret; | |
2444 | return true; | |
2445 | } | |
2446 | return false; | |
2447 | default: | |
2448 | rbd_assert(0); | |
2449 | } | |
2450 | } | |
2451 | ||
2452 | /* | |
2453 | * Returns true if @obj_req is completed, or false otherwise. | |
2454 | */ | |
2455 | static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2456 | { | |
9bb0248d | 2457 | switch (obj_req->img_request->op_type) { |
3da691bf ID |
2458 | case OBJ_OP_READ: |
2459 | return rbd_obj_handle_read(obj_req); | |
2460 | case OBJ_OP_WRITE: | |
2461 | return rbd_obj_handle_write(obj_req); | |
2462 | case OBJ_OP_DISCARD: | |
2463 | if (rbd_obj_handle_write(obj_req)) { | |
2464 | /* | |
2465 | * Hide -ENOENT from delete/truncate/zero -- discarding | |
2466 | * a non-existent object is not a problem. | |
2467 | */ | |
2468 | if (obj_req->result == -ENOENT) { | |
2469 | obj_req->result = 0; | |
43df3d35 | 2470 | obj_req->xferred = obj_req->ex.oe_len; |
3da691bf ID |
2471 | } |
2472 | return true; | |
2473 | } | |
2474 | return false; | |
2475 | default: | |
2476 | rbd_assert(0); | |
2477 | } | |
2478 | } | |
2479 | ||
7114edac ID |
2480 | static void rbd_obj_end_request(struct rbd_obj_request *obj_req) |
2481 | { | |
2482 | struct rbd_img_request *img_req = obj_req->img_request; | |
2483 | ||
2484 | rbd_assert((!obj_req->result && | |
43df3d35 | 2485 | obj_req->xferred == obj_req->ex.oe_len) || |
7114edac ID |
2486 | (obj_req->result < 0 && !obj_req->xferred)); |
2487 | if (!obj_req->result) { | |
2488 | img_req->xferred += obj_req->xferred; | |
2489 | return; | |
2490 | } | |
2491 | ||
2492 | rbd_warn(img_req->rbd_dev, | |
2493 | "%s at objno %llu %llu~%llu result %d xferred %llu", | |
43df3d35 ID |
2494 | obj_op_name(img_req->op_type), obj_req->ex.oe_objno, |
2495 | obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result, | |
7114edac ID |
2496 | obj_req->xferred); |
2497 | if (!img_req->result) { | |
2498 | img_req->result = obj_req->result; | |
2499 | img_req->xferred = 0; | |
2500 | } | |
2501 | } | |
2502 | ||
3da691bf ID |
2503 | static void rbd_img_end_child_request(struct rbd_img_request *img_req) |
2504 | { | |
2505 | struct rbd_obj_request *obj_req = img_req->obj_request; | |
2506 | ||
2507 | rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags)); | |
86bd7998 ID |
2508 | rbd_assert((!img_req->result && |
2509 | img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) || | |
2510 | (img_req->result < 0 && !img_req->xferred)); | |
3da691bf ID |
2511 | |
2512 | obj_req->result = img_req->result; | |
2513 | obj_req->xferred = img_req->xferred; | |
2514 | rbd_img_request_put(img_req); | |
7114edac | 2515 | } |
3da691bf | 2516 | |
7114edac ID |
2517 | static void rbd_img_end_request(struct rbd_img_request *img_req) |
2518 | { | |
2519 | rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags)); | |
2520 | rbd_assert((!img_req->result && | |
2521 | img_req->xferred == blk_rq_bytes(img_req->rq)) || | |
2522 | (img_req->result < 0 && !img_req->xferred)); | |
2523 | ||
2524 | blk_mq_end_request(img_req->rq, | |
2525 | errno_to_blk_status(img_req->result)); | |
2526 | rbd_img_request_put(img_req); | |
3da691bf ID |
2527 | } |
2528 | ||
2529 | static void rbd_obj_handle_request(struct rbd_obj_request *obj_req) | |
2530 | { | |
7114edac ID |
2531 | struct rbd_img_request *img_req; |
2532 | ||
2533 | again: | |
3da691bf ID |
2534 | if (!__rbd_obj_handle_request(obj_req)) |
2535 | return; | |
2536 | ||
7114edac ID |
2537 | img_req = obj_req->img_request; |
2538 | spin_lock(&img_req->completion_lock); | |
2539 | rbd_obj_end_request(obj_req); | |
2540 | rbd_assert(img_req->pending_count); | |
2541 | if (--img_req->pending_count) { | |
2542 | spin_unlock(&img_req->completion_lock); | |
2543 | return; | |
2544 | } | |
2545 | ||
2546 | spin_unlock(&img_req->completion_lock); | |
2547 | if (test_bit(IMG_REQ_CHILD, &img_req->flags)) { | |
2548 | obj_req = img_req->obj_request; | |
2549 | rbd_img_end_child_request(img_req); | |
2550 | goto again; | |
2551 | } | |
2552 | rbd_img_end_request(img_req); | |
3da691bf ID |
2553 | } |
2554 | ||
ed95b21a | 2555 | static const struct rbd_client_id rbd_empty_cid; |
b8d70035 | 2556 | |
ed95b21a ID |
2557 | static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
2558 | const struct rbd_client_id *rhs) | |
2559 | { | |
2560 | return lhs->gid == rhs->gid && lhs->handle == rhs->handle; | |
2561 | } | |
2562 | ||
2563 | static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) | |
2564 | { | |
2565 | struct rbd_client_id cid; | |
2566 | ||
2567 | mutex_lock(&rbd_dev->watch_mutex); | |
2568 | cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); | |
2569 | cid.handle = rbd_dev->watch_cookie; | |
2570 | mutex_unlock(&rbd_dev->watch_mutex); | |
2571 | return cid; | |
2572 | } | |
2573 | ||
2574 | /* | |
2575 | * lock_rwsem must be held for write | |
2576 | */ | |
2577 | static void rbd_set_owner_cid(struct rbd_device *rbd_dev, | |
2578 | const struct rbd_client_id *cid) | |
2579 | { | |
2580 | dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, | |
2581 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, | |
2582 | cid->gid, cid->handle); | |
2583 | rbd_dev->owner_cid = *cid; /* struct */ | |
2584 | } | |
2585 | ||
2586 | static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) | |
2587 | { | |
2588 | mutex_lock(&rbd_dev->watch_mutex); | |
2589 | sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); | |
2590 | mutex_unlock(&rbd_dev->watch_mutex); | |
2591 | } | |
2592 | ||
edd8ca80 FM |
2593 | static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie) |
2594 | { | |
2595 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); | |
2596 | ||
2597 | strcpy(rbd_dev->lock_cookie, cookie); | |
2598 | rbd_set_owner_cid(rbd_dev, &cid); | |
2599 | queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); | |
2600 | } | |
2601 | ||
ed95b21a ID |
2602 | /* |
2603 | * lock_rwsem must be held for write | |
2604 | */ | |
2605 | static int rbd_lock(struct rbd_device *rbd_dev) | |
b8d70035 | 2606 | { |
922dab61 | 2607 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
ed95b21a | 2608 | char cookie[32]; |
e627db08 | 2609 | int ret; |
b8d70035 | 2610 | |
cbbfb0ff ID |
2611 | WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
2612 | rbd_dev->lock_cookie[0] != '\0'); | |
52bb1f9b | 2613 | |
ed95b21a ID |
2614 | format_lock_cookie(rbd_dev, cookie); |
2615 | ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, | |
2616 | RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, | |
2617 | RBD_LOCK_TAG, "", 0); | |
e627db08 | 2618 | if (ret) |
ed95b21a | 2619 | return ret; |
b8d70035 | 2620 | |
ed95b21a | 2621 | rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
edd8ca80 | 2622 | __rbd_lock(rbd_dev, cookie); |
ed95b21a | 2623 | return 0; |
b8d70035 AE |
2624 | } |
2625 | ||
ed95b21a ID |
2626 | /* |
2627 | * lock_rwsem must be held for write | |
2628 | */ | |
bbead745 | 2629 | static void rbd_unlock(struct rbd_device *rbd_dev) |
bb040aa0 | 2630 | { |
922dab61 | 2631 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
bb040aa0 ID |
2632 | int ret; |
2633 | ||
cbbfb0ff ID |
2634 | WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
2635 | rbd_dev->lock_cookie[0] == '\0'); | |
bb040aa0 | 2636 | |
ed95b21a | 2637 | ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
cbbfb0ff | 2638 | RBD_LOCK_NAME, rbd_dev->lock_cookie); |
bbead745 ID |
2639 | if (ret && ret != -ENOENT) |
2640 | rbd_warn(rbd_dev, "failed to unlock: %d", ret); | |
bb040aa0 | 2641 | |
bbead745 ID |
2642 | /* treat errors as the image is unlocked */ |
2643 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
cbbfb0ff | 2644 | rbd_dev->lock_cookie[0] = '\0'; |
ed95b21a ID |
2645 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
2646 | queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); | |
bb040aa0 ID |
2647 | } |
2648 | ||
ed95b21a ID |
2649 | static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2650 | enum rbd_notify_op notify_op, | |
2651 | struct page ***preply_pages, | |
2652 | size_t *preply_len) | |
9969ebc5 AE |
2653 | { |
2654 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
ed95b21a ID |
2655 | struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
2656 | int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN; | |
2657 | char buf[buf_size]; | |
2658 | void *p = buf; | |
9969ebc5 | 2659 | |
ed95b21a | 2660 | dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
9969ebc5 | 2661 | |
ed95b21a ID |
2662 | /* encode *LockPayload NotifyMessage (op + ClientId) */ |
2663 | ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); | |
2664 | ceph_encode_32(&p, notify_op); | |
2665 | ceph_encode_64(&p, cid.gid); | |
2666 | ceph_encode_64(&p, cid.handle); | |
8eb87565 | 2667 | |
ed95b21a ID |
2668 | return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
2669 | &rbd_dev->header_oloc, buf, buf_size, | |
2670 | RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); | |
b30a01f2 ID |
2671 | } |
2672 | ||
ed95b21a ID |
2673 | static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
2674 | enum rbd_notify_op notify_op) | |
b30a01f2 | 2675 | { |
ed95b21a ID |
2676 | struct page **reply_pages; |
2677 | size_t reply_len; | |
b30a01f2 | 2678 | |
ed95b21a ID |
2679 | __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
2680 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2681 | } | |
b30a01f2 | 2682 | |
ed95b21a ID |
2683 | static void rbd_notify_acquired_lock(struct work_struct *work) |
2684 | { | |
2685 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
2686 | acquired_lock_work); | |
76756a51 | 2687 | |
ed95b21a | 2688 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
c525f036 ID |
2689 | } |
2690 | ||
ed95b21a | 2691 | static void rbd_notify_released_lock(struct work_struct *work) |
c525f036 | 2692 | { |
ed95b21a ID |
2693 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
2694 | released_lock_work); | |
811c6688 | 2695 | |
ed95b21a | 2696 | rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
fca27065 ID |
2697 | } |
2698 | ||
ed95b21a | 2699 | static int rbd_request_lock(struct rbd_device *rbd_dev) |
36be9a76 | 2700 | { |
ed95b21a ID |
2701 | struct page **reply_pages; |
2702 | size_t reply_len; | |
2703 | bool lock_owner_responded = false; | |
36be9a76 AE |
2704 | int ret; |
2705 | ||
ed95b21a | 2706 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
36be9a76 | 2707 | |
ed95b21a ID |
2708 | ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
2709 | &reply_pages, &reply_len); | |
2710 | if (ret && ret != -ETIMEDOUT) { | |
2711 | rbd_warn(rbd_dev, "failed to request lock: %d", ret); | |
36be9a76 | 2712 | goto out; |
ed95b21a | 2713 | } |
36be9a76 | 2714 | |
ed95b21a ID |
2715 | if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
2716 | void *p = page_address(reply_pages[0]); | |
2717 | void *const end = p + reply_len; | |
2718 | u32 n; | |
36be9a76 | 2719 | |
ed95b21a ID |
2720 | ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
2721 | while (n--) { | |
2722 | u8 struct_v; | |
2723 | u32 len; | |
36be9a76 | 2724 | |
ed95b21a ID |
2725 | ceph_decode_need(&p, end, 8 + 8, e_inval); |
2726 | p += 8 + 8; /* skip gid and cookie */ | |
04017e29 | 2727 | |
ed95b21a ID |
2728 | ceph_decode_32_safe(&p, end, len, e_inval); |
2729 | if (!len) | |
2730 | continue; | |
2731 | ||
2732 | if (lock_owner_responded) { | |
2733 | rbd_warn(rbd_dev, | |
2734 | "duplicate lock owners detected"); | |
2735 | ret = -EIO; | |
2736 | goto out; | |
2737 | } | |
2738 | ||
2739 | lock_owner_responded = true; | |
2740 | ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", | |
2741 | &struct_v, &len); | |
2742 | if (ret) { | |
2743 | rbd_warn(rbd_dev, | |
2744 | "failed to decode ResponseMessage: %d", | |
2745 | ret); | |
2746 | goto e_inval; | |
2747 | } | |
2748 | ||
2749 | ret = ceph_decode_32(&p); | |
2750 | } | |
2751 | } | |
2752 | ||
2753 | if (!lock_owner_responded) { | |
2754 | rbd_warn(rbd_dev, "no lock owners detected"); | |
2755 | ret = -ETIMEDOUT; | |
2756 | } | |
2757 | ||
2758 | out: | |
2759 | ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); | |
2760 | return ret; | |
2761 | ||
2762 | e_inval: | |
2763 | ret = -EINVAL; | |
2764 | goto out; | |
2765 | } | |
2766 | ||
2767 | static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) | |
2768 | { | |
2769 | dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); | |
2770 | ||
2771 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
2772 | if (wake_all) | |
2773 | wake_up_all(&rbd_dev->lock_waitq); | |
2774 | else | |
2775 | wake_up(&rbd_dev->lock_waitq); | |
2776 | } | |
2777 | ||
2778 | static int get_lock_owner_info(struct rbd_device *rbd_dev, | |
2779 | struct ceph_locker **lockers, u32 *num_lockers) | |
2780 | { | |
2781 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2782 | u8 lock_type; | |
2783 | char *lock_tag; | |
2784 | int ret; | |
2785 | ||
2786 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2787 | ||
2788 | ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, | |
2789 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2790 | &lock_type, &lock_tag, lockers, num_lockers); | |
2791 | if (ret) | |
2792 | return ret; | |
2793 | ||
2794 | if (*num_lockers == 0) { | |
2795 | dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); | |
2796 | goto out; | |
2797 | } | |
2798 | ||
2799 | if (strcmp(lock_tag, RBD_LOCK_TAG)) { | |
2800 | rbd_warn(rbd_dev, "locked by external mechanism, tag %s", | |
2801 | lock_tag); | |
2802 | ret = -EBUSY; | |
2803 | goto out; | |
2804 | } | |
2805 | ||
2806 | if (lock_type == CEPH_CLS_LOCK_SHARED) { | |
2807 | rbd_warn(rbd_dev, "shared lock type detected"); | |
2808 | ret = -EBUSY; | |
2809 | goto out; | |
2810 | } | |
2811 | ||
2812 | if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, | |
2813 | strlen(RBD_LOCK_COOKIE_PREFIX))) { | |
2814 | rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", | |
2815 | (*lockers)[0].id.cookie); | |
2816 | ret = -EBUSY; | |
2817 | goto out; | |
2818 | } | |
2819 | ||
2820 | out: | |
2821 | kfree(lock_tag); | |
2822 | return ret; | |
2823 | } | |
2824 | ||
2825 | static int find_watcher(struct rbd_device *rbd_dev, | |
2826 | const struct ceph_locker *locker) | |
2827 | { | |
2828 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2829 | struct ceph_watch_item *watchers; | |
2830 | u32 num_watchers; | |
2831 | u64 cookie; | |
2832 | int i; | |
2833 | int ret; | |
2834 | ||
2835 | ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, | |
2836 | &rbd_dev->header_oloc, &watchers, | |
2837 | &num_watchers); | |
2838 | if (ret) | |
2839 | return ret; | |
2840 | ||
2841 | sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); | |
2842 | for (i = 0; i < num_watchers; i++) { | |
2843 | if (!memcmp(&watchers[i].addr, &locker->info.addr, | |
2844 | sizeof(locker->info.addr)) && | |
2845 | watchers[i].cookie == cookie) { | |
2846 | struct rbd_client_id cid = { | |
2847 | .gid = le64_to_cpu(watchers[i].name.num), | |
2848 | .handle = cookie, | |
2849 | }; | |
2850 | ||
2851 | dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, | |
2852 | rbd_dev, cid.gid, cid.handle); | |
2853 | rbd_set_owner_cid(rbd_dev, &cid); | |
2854 | ret = 1; | |
2855 | goto out; | |
2856 | } | |
2857 | } | |
2858 | ||
2859 | dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); | |
2860 | ret = 0; | |
2861 | out: | |
2862 | kfree(watchers); | |
2863 | return ret; | |
2864 | } | |
2865 | ||
2866 | /* | |
2867 | * lock_rwsem must be held for write | |
2868 | */ | |
2869 | static int rbd_try_lock(struct rbd_device *rbd_dev) | |
2870 | { | |
2871 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2872 | struct ceph_locker *lockers; | |
2873 | u32 num_lockers; | |
2874 | int ret; | |
2875 | ||
2876 | for (;;) { | |
2877 | ret = rbd_lock(rbd_dev); | |
2878 | if (ret != -EBUSY) | |
2879 | return ret; | |
2880 | ||
2881 | /* determine if the current lock holder is still alive */ | |
2882 | ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); | |
2883 | if (ret) | |
2884 | return ret; | |
2885 | ||
2886 | if (num_lockers == 0) | |
2887 | goto again; | |
2888 | ||
2889 | ret = find_watcher(rbd_dev, lockers); | |
2890 | if (ret) { | |
2891 | if (ret > 0) | |
2892 | ret = 0; /* have to request lock */ | |
2893 | goto out; | |
2894 | } | |
2895 | ||
2896 | rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", | |
2897 | ENTITY_NAME(lockers[0].id.name)); | |
2898 | ||
2899 | ret = ceph_monc_blacklist_add(&client->monc, | |
2900 | &lockers[0].info.addr); | |
2901 | if (ret) { | |
2902 | rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", | |
2903 | ENTITY_NAME(lockers[0].id.name), ret); | |
2904 | goto out; | |
2905 | } | |
2906 | ||
2907 | ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, | |
2908 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
2909 | lockers[0].id.cookie, | |
2910 | &lockers[0].id.name); | |
2911 | if (ret && ret != -ENOENT) | |
2912 | goto out; | |
2913 | ||
2914 | again: | |
2915 | ceph_free_lockers(lockers, num_lockers); | |
2916 | } | |
2917 | ||
2918 | out: | |
2919 | ceph_free_lockers(lockers, num_lockers); | |
2920 | return ret; | |
2921 | } | |
2922 | ||
2923 | /* | |
2924 | * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED | |
2925 | */ | |
2926 | static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, | |
2927 | int *pret) | |
2928 | { | |
2929 | enum rbd_lock_state lock_state; | |
2930 | ||
2931 | down_read(&rbd_dev->lock_rwsem); | |
2932 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
2933 | rbd_dev->lock_state); | |
2934 | if (__rbd_is_lock_owner(rbd_dev)) { | |
2935 | lock_state = rbd_dev->lock_state; | |
2936 | up_read(&rbd_dev->lock_rwsem); | |
2937 | return lock_state; | |
2938 | } | |
2939 | ||
2940 | up_read(&rbd_dev->lock_rwsem); | |
2941 | down_write(&rbd_dev->lock_rwsem); | |
2942 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
2943 | rbd_dev->lock_state); | |
2944 | if (!__rbd_is_lock_owner(rbd_dev)) { | |
2945 | *pret = rbd_try_lock(rbd_dev); | |
2946 | if (*pret) | |
2947 | rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); | |
2948 | } | |
2949 | ||
2950 | lock_state = rbd_dev->lock_state; | |
2951 | up_write(&rbd_dev->lock_rwsem); | |
2952 | return lock_state; | |
2953 | } | |
2954 | ||
2955 | static void rbd_acquire_lock(struct work_struct *work) | |
2956 | { | |
2957 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
2958 | struct rbd_device, lock_dwork); | |
2959 | enum rbd_lock_state lock_state; | |
37f13252 | 2960 | int ret = 0; |
ed95b21a ID |
2961 | |
2962 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
2963 | again: | |
2964 | lock_state = rbd_try_acquire_lock(rbd_dev, &ret); | |
2965 | if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { | |
2966 | if (lock_state == RBD_LOCK_STATE_LOCKED) | |
2967 | wake_requests(rbd_dev, true); | |
2968 | dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, | |
2969 | rbd_dev, lock_state, ret); | |
2970 | return; | |
2971 | } | |
2972 | ||
2973 | ret = rbd_request_lock(rbd_dev); | |
2974 | if (ret == -ETIMEDOUT) { | |
2975 | goto again; /* treat this as a dead client */ | |
e010dd0a ID |
2976 | } else if (ret == -EROFS) { |
2977 | rbd_warn(rbd_dev, "peer will not release lock"); | |
2978 | /* | |
2979 | * If this is rbd_add_acquire_lock(), we want to fail | |
2980 | * immediately -- reuse BLACKLISTED flag. Otherwise we | |
2981 | * want to block. | |
2982 | */ | |
2983 | if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { | |
2984 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); | |
2985 | /* wake "rbd map --exclusive" process */ | |
2986 | wake_requests(rbd_dev, false); | |
2987 | } | |
ed95b21a ID |
2988 | } else if (ret < 0) { |
2989 | rbd_warn(rbd_dev, "error requesting lock: %d", ret); | |
2990 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
2991 | RBD_RETRY_DELAY); | |
2992 | } else { | |
2993 | /* | |
2994 | * lock owner acked, but resend if we don't see them | |
2995 | * release the lock | |
2996 | */ | |
2997 | dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, | |
2998 | rbd_dev); | |
2999 | mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, | |
3000 | msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); | |
3001 | } | |
3002 | } | |
3003 | ||
3004 | /* | |
3005 | * lock_rwsem must be held for write | |
3006 | */ | |
3007 | static bool rbd_release_lock(struct rbd_device *rbd_dev) | |
3008 | { | |
3009 | dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, | |
3010 | rbd_dev->lock_state); | |
3011 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) | |
3012 | return false; | |
3013 | ||
3014 | rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; | |
3015 | downgrade_write(&rbd_dev->lock_rwsem); | |
52bb1f9b | 3016 | /* |
ed95b21a | 3017 | * Ensure that all in-flight IO is flushed. |
52bb1f9b | 3018 | * |
ed95b21a ID |
3019 | * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
3020 | * may be shared with other devices. | |
52bb1f9b | 3021 | */ |
ed95b21a ID |
3022 | ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
3023 | up_read(&rbd_dev->lock_rwsem); | |
3024 | ||
3025 | down_write(&rbd_dev->lock_rwsem); | |
3026 | dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, | |
3027 | rbd_dev->lock_state); | |
3028 | if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) | |
3029 | return false; | |
3030 | ||
bbead745 ID |
3031 | rbd_unlock(rbd_dev); |
3032 | /* | |
3033 | * Give others a chance to grab the lock - we would re-acquire | |
3034 | * almost immediately if we got new IO during ceph_osdc_sync() | |
3035 | * otherwise. We need to ack our own notifications, so this | |
3036 | * lock_dwork will be requeued from rbd_wait_state_locked() | |
3037 | * after wake_requests() in rbd_handle_released_lock(). | |
3038 | */ | |
3039 | cancel_delayed_work(&rbd_dev->lock_dwork); | |
ed95b21a ID |
3040 | return true; |
3041 | } | |
3042 | ||
3043 | static void rbd_release_lock_work(struct work_struct *work) | |
3044 | { | |
3045 | struct rbd_device *rbd_dev = container_of(work, struct rbd_device, | |
3046 | unlock_work); | |
3047 | ||
3048 | down_write(&rbd_dev->lock_rwsem); | |
3049 | rbd_release_lock(rbd_dev); | |
3050 | up_write(&rbd_dev->lock_rwsem); | |
3051 | } | |
3052 | ||
3053 | static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3054 | void **p) | |
3055 | { | |
3056 | struct rbd_client_id cid = { 0 }; | |
3057 | ||
3058 | if (struct_v >= 2) { | |
3059 | cid.gid = ceph_decode_64(p); | |
3060 | cid.handle = ceph_decode_64(p); | |
3061 | } | |
3062 | ||
3063 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3064 | cid.handle); | |
3065 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3066 | down_write(&rbd_dev->lock_rwsem); | |
3067 | if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3068 | /* | |
3069 | * we already know that the remote client is | |
3070 | * the owner | |
3071 | */ | |
3072 | up_write(&rbd_dev->lock_rwsem); | |
3073 | return; | |
3074 | } | |
3075 | ||
3076 | rbd_set_owner_cid(rbd_dev, &cid); | |
3077 | downgrade_write(&rbd_dev->lock_rwsem); | |
3078 | } else { | |
3079 | down_read(&rbd_dev->lock_rwsem); | |
3080 | } | |
3081 | ||
3082 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3083 | wake_requests(rbd_dev, false); | |
3084 | up_read(&rbd_dev->lock_rwsem); | |
3085 | } | |
3086 | ||
3087 | static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3088 | void **p) | |
3089 | { | |
3090 | struct rbd_client_id cid = { 0 }; | |
3091 | ||
3092 | if (struct_v >= 2) { | |
3093 | cid.gid = ceph_decode_64(p); | |
3094 | cid.handle = ceph_decode_64(p); | |
3095 | } | |
3096 | ||
3097 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3098 | cid.handle); | |
3099 | if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { | |
3100 | down_write(&rbd_dev->lock_rwsem); | |
3101 | if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { | |
3102 | dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", | |
3103 | __func__, rbd_dev, cid.gid, cid.handle, | |
3104 | rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); | |
3105 | up_write(&rbd_dev->lock_rwsem); | |
3106 | return; | |
3107 | } | |
3108 | ||
3109 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3110 | downgrade_write(&rbd_dev->lock_rwsem); | |
3111 | } else { | |
3112 | down_read(&rbd_dev->lock_rwsem); | |
3113 | } | |
3114 | ||
3115 | if (!__rbd_is_lock_owner(rbd_dev)) | |
3116 | wake_requests(rbd_dev, false); | |
3117 | up_read(&rbd_dev->lock_rwsem); | |
3118 | } | |
3119 | ||
3b77faa0 ID |
3120 | /* |
3121 | * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no | |
3122 | * ResponseMessage is needed. | |
3123 | */ | |
3124 | static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, | |
3125 | void **p) | |
ed95b21a ID |
3126 | { |
3127 | struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); | |
3128 | struct rbd_client_id cid = { 0 }; | |
3b77faa0 | 3129 | int result = 1; |
ed95b21a ID |
3130 | |
3131 | if (struct_v >= 2) { | |
3132 | cid.gid = ceph_decode_64(p); | |
3133 | cid.handle = ceph_decode_64(p); | |
3134 | } | |
3135 | ||
3136 | dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, | |
3137 | cid.handle); | |
3138 | if (rbd_cid_equal(&cid, &my_cid)) | |
3b77faa0 | 3139 | return result; |
ed95b21a ID |
3140 | |
3141 | down_read(&rbd_dev->lock_rwsem); | |
3b77faa0 ID |
3142 | if (__rbd_is_lock_owner(rbd_dev)) { |
3143 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && | |
3144 | rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) | |
3145 | goto out_unlock; | |
3146 | ||
3147 | /* | |
3148 | * encode ResponseMessage(0) so the peer can detect | |
3149 | * a missing owner | |
3150 | */ | |
3151 | result = 0; | |
3152 | ||
3153 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { | |
e010dd0a ID |
3154 | if (!rbd_dev->opts->exclusive) { |
3155 | dout("%s rbd_dev %p queueing unlock_work\n", | |
3156 | __func__, rbd_dev); | |
3157 | queue_work(rbd_dev->task_wq, | |
3158 | &rbd_dev->unlock_work); | |
3159 | } else { | |
3160 | /* refuse to release the lock */ | |
3161 | result = -EROFS; | |
3162 | } | |
ed95b21a ID |
3163 | } |
3164 | } | |
3b77faa0 ID |
3165 | |
3166 | out_unlock: | |
ed95b21a | 3167 | up_read(&rbd_dev->lock_rwsem); |
3b77faa0 | 3168 | return result; |
ed95b21a ID |
3169 | } |
3170 | ||
3171 | static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, | |
3172 | u64 notify_id, u64 cookie, s32 *result) | |
3173 | { | |
3174 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3175 | int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; | |
3176 | char buf[buf_size]; | |
3177 | int ret; | |
3178 | ||
3179 | if (result) { | |
3180 | void *p = buf; | |
3181 | ||
3182 | /* encode ResponseMessage */ | |
3183 | ceph_start_encoding(&p, 1, 1, | |
3184 | buf_size - CEPH_ENCODING_START_BLK_LEN); | |
3185 | ceph_encode_32(&p, *result); | |
3186 | } else { | |
3187 | buf_size = 0; | |
3188 | } | |
b8d70035 | 3189 | |
922dab61 ID |
3190 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3191 | &rbd_dev->header_oloc, notify_id, cookie, | |
ed95b21a | 3192 | buf, buf_size); |
52bb1f9b | 3193 | if (ret) |
ed95b21a ID |
3194 | rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
3195 | } | |
3196 | ||
3197 | static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, | |
3198 | u64 cookie) | |
3199 | { | |
3200 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3201 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); | |
3202 | } | |
3203 | ||
3204 | static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, | |
3205 | u64 notify_id, u64 cookie, s32 result) | |
3206 | { | |
3207 | dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); | |
3208 | __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); | |
3209 | } | |
3210 | ||
3211 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, | |
3212 | u64 notifier_id, void *data, size_t data_len) | |
3213 | { | |
3214 | struct rbd_device *rbd_dev = arg; | |
3215 | void *p = data; | |
3216 | void *const end = p + data_len; | |
d4c2269b | 3217 | u8 struct_v = 0; |
ed95b21a ID |
3218 | u32 len; |
3219 | u32 notify_op; | |
3220 | int ret; | |
3221 | ||
3222 | dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", | |
3223 | __func__, rbd_dev, cookie, notify_id, data_len); | |
3224 | if (data_len) { | |
3225 | ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", | |
3226 | &struct_v, &len); | |
3227 | if (ret) { | |
3228 | rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", | |
3229 | ret); | |
3230 | return; | |
3231 | } | |
3232 | ||
3233 | notify_op = ceph_decode_32(&p); | |
3234 | } else { | |
3235 | /* legacy notification for header updates */ | |
3236 | notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; | |
3237 | len = 0; | |
3238 | } | |
3239 | ||
3240 | dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); | |
3241 | switch (notify_op) { | |
3242 | case RBD_NOTIFY_OP_ACQUIRED_LOCK: | |
3243 | rbd_handle_acquired_lock(rbd_dev, struct_v, &p); | |
3244 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3245 | break; | |
3246 | case RBD_NOTIFY_OP_RELEASED_LOCK: | |
3247 | rbd_handle_released_lock(rbd_dev, struct_v, &p); | |
3248 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3249 | break; | |
3250 | case RBD_NOTIFY_OP_REQUEST_LOCK: | |
3b77faa0 ID |
3251 | ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
3252 | if (ret <= 0) | |
ed95b21a | 3253 | rbd_acknowledge_notify_result(rbd_dev, notify_id, |
3b77faa0 | 3254 | cookie, ret); |
ed95b21a ID |
3255 | else |
3256 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3257 | break; | |
3258 | case RBD_NOTIFY_OP_HEADER_UPDATE: | |
3259 | ret = rbd_dev_refresh(rbd_dev); | |
3260 | if (ret) | |
3261 | rbd_warn(rbd_dev, "refresh failed: %d", ret); | |
3262 | ||
3263 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3264 | break; | |
3265 | default: | |
3266 | if (rbd_is_lock_owner(rbd_dev)) | |
3267 | rbd_acknowledge_notify_result(rbd_dev, notify_id, | |
3268 | cookie, -EOPNOTSUPP); | |
3269 | else | |
3270 | rbd_acknowledge_notify(rbd_dev, notify_id, cookie); | |
3271 | break; | |
3272 | } | |
b8d70035 AE |
3273 | } |
3274 | ||
99d16943 ID |
3275 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3276 | ||
922dab61 | 3277 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3278 | { |
922dab61 | 3279 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3280 | |
922dab61 | 3281 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3282 | |
ed95b21a ID |
3283 | down_write(&rbd_dev->lock_rwsem); |
3284 | rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); | |
3285 | up_write(&rbd_dev->lock_rwsem); | |
3286 | ||
99d16943 ID |
3287 | mutex_lock(&rbd_dev->watch_mutex); |
3288 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3289 | __rbd_unregister_watch(rbd_dev); | |
3290 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3291 | |
99d16943 | 3292 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3293 | } |
99d16943 | 3294 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3295 | } |
3296 | ||
9969ebc5 | 3297 | /* |
99d16943 | 3298 | * watch_mutex must be locked |
9969ebc5 | 3299 | */ |
99d16943 | 3300 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3301 | { |
3302 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3303 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3304 | |
922dab61 | 3305 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3306 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3307 | |
922dab61 ID |
3308 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3309 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3310 | rbd_watch_errcb, rbd_dev); | |
3311 | if (IS_ERR(handle)) | |
3312 | return PTR_ERR(handle); | |
8eb87565 | 3313 | |
922dab61 | 3314 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3315 | return 0; |
b30a01f2 ID |
3316 | } |
3317 | ||
99d16943 ID |
3318 | /* |
3319 | * watch_mutex must be locked | |
3320 | */ | |
3321 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3322 | { |
922dab61 ID |
3323 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3324 | int ret; | |
b30a01f2 | 3325 | |
99d16943 ID |
3326 | rbd_assert(rbd_dev->watch_handle); |
3327 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3328 | |
922dab61 ID |
3329 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3330 | if (ret) | |
3331 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3332 | |
922dab61 | 3333 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3334 | } |
3335 | ||
99d16943 ID |
3336 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3337 | { | |
3338 | int ret; | |
3339 | ||
3340 | mutex_lock(&rbd_dev->watch_mutex); | |
3341 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3342 | ret = __rbd_register_watch(rbd_dev); | |
3343 | if (ret) | |
3344 | goto out; | |
3345 | ||
3346 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3347 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3348 | ||
3349 | out: | |
3350 | mutex_unlock(&rbd_dev->watch_mutex); | |
3351 | return ret; | |
3352 | } | |
3353 | ||
3354 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3355 | { |
99d16943 ID |
3356 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3357 | ||
3358 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
ed95b21a ID |
3359 | cancel_work_sync(&rbd_dev->acquired_lock_work); |
3360 | cancel_work_sync(&rbd_dev->released_lock_work); | |
3361 | cancel_delayed_work_sync(&rbd_dev->lock_dwork); | |
3362 | cancel_work_sync(&rbd_dev->unlock_work); | |
99d16943 ID |
3363 | } |
3364 | ||
3365 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3366 | { | |
ed95b21a | 3367 | WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
99d16943 ID |
3368 | cancel_tasks_sync(rbd_dev); |
3369 | ||
3370 | mutex_lock(&rbd_dev->watch_mutex); | |
3371 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3372 | __rbd_unregister_watch(rbd_dev); | |
3373 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3374 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3375 | |
811c6688 | 3376 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3377 | } |
3378 | ||
14bb211d ID |
3379 | /* |
3380 | * lock_rwsem must be held for write | |
3381 | */ | |
3382 | static void rbd_reacquire_lock(struct rbd_device *rbd_dev) | |
3383 | { | |
3384 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3385 | char cookie[32]; | |
3386 | int ret; | |
3387 | ||
3388 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); | |
3389 | ||
3390 | format_lock_cookie(rbd_dev, cookie); | |
3391 | ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, | |
3392 | &rbd_dev->header_oloc, RBD_LOCK_NAME, | |
3393 | CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, | |
3394 | RBD_LOCK_TAG, cookie); | |
3395 | if (ret) { | |
3396 | if (ret != -EOPNOTSUPP) | |
3397 | rbd_warn(rbd_dev, "failed to update lock cookie: %d", | |
3398 | ret); | |
3399 | ||
3400 | /* | |
3401 | * Lock cookie cannot be updated on older OSDs, so do | |
3402 | * a manual release and queue an acquire. | |
3403 | */ | |
3404 | if (rbd_release_lock(rbd_dev)) | |
3405 | queue_delayed_work(rbd_dev->task_wq, | |
3406 | &rbd_dev->lock_dwork, 0); | |
3407 | } else { | |
edd8ca80 | 3408 | __rbd_lock(rbd_dev, cookie); |
14bb211d ID |
3409 | } |
3410 | } | |
3411 | ||
99d16943 ID |
3412 | static void rbd_reregister_watch(struct work_struct *work) |
3413 | { | |
3414 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3415 | struct rbd_device, watch_dwork); | |
3416 | int ret; | |
3417 | ||
3418 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3419 | ||
3420 | mutex_lock(&rbd_dev->watch_mutex); | |
87c0fded ID |
3421 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
3422 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3423 | return; |
87c0fded | 3424 | } |
99d16943 ID |
3425 | |
3426 | ret = __rbd_register_watch(rbd_dev); | |
3427 | if (ret) { | |
3428 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
4d73644b | 3429 | if (ret == -EBLACKLISTED || ret == -ENOENT) { |
87c0fded | 3430 | set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
14bb211d | 3431 | wake_requests(rbd_dev, true); |
87c0fded | 3432 | } else { |
99d16943 ID |
3433 | queue_delayed_work(rbd_dev->task_wq, |
3434 | &rbd_dev->watch_dwork, | |
3435 | RBD_RETRY_DELAY); | |
87c0fded ID |
3436 | } |
3437 | mutex_unlock(&rbd_dev->watch_mutex); | |
14bb211d | 3438 | return; |
99d16943 ID |
3439 | } |
3440 | ||
3441 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3442 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3443 | mutex_unlock(&rbd_dev->watch_mutex); | |
3444 | ||
14bb211d ID |
3445 | down_write(&rbd_dev->lock_rwsem); |
3446 | if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) | |
3447 | rbd_reacquire_lock(rbd_dev); | |
3448 | up_write(&rbd_dev->lock_rwsem); | |
3449 | ||
99d16943 ID |
3450 | ret = rbd_dev_refresh(rbd_dev); |
3451 | if (ret) | |
3452 | rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); | |
99d16943 ID |
3453 | } |
3454 | ||
36be9a76 | 3455 | /* |
f40eb349 AE |
3456 | * Synchronous osd object method call. Returns the number of bytes |
3457 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3458 | */ |
3459 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
ecd4a68a ID |
3460 | struct ceph_object_id *oid, |
3461 | struct ceph_object_locator *oloc, | |
36be9a76 | 3462 | const char *method_name, |
4157976b | 3463 | const void *outbound, |
36be9a76 | 3464 | size_t outbound_size, |
4157976b | 3465 | void *inbound, |
e2a58ee5 | 3466 | size_t inbound_size) |
36be9a76 | 3467 | { |
ecd4a68a ID |
3468 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3469 | struct page *req_page = NULL; | |
3470 | struct page *reply_page; | |
36be9a76 AE |
3471 | int ret; |
3472 | ||
3473 | /* | |
6010a451 AE |
3474 | * Method calls are ultimately read operations. The result |
3475 | * should placed into the inbound buffer provided. They | |
3476 | * also supply outbound data--parameters for the object | |
3477 | * method. Currently if this is present it will be a | |
3478 | * snapshot id. | |
36be9a76 | 3479 | */ |
ecd4a68a ID |
3480 | if (outbound) { |
3481 | if (outbound_size > PAGE_SIZE) | |
3482 | return -E2BIG; | |
36be9a76 | 3483 | |
ecd4a68a ID |
3484 | req_page = alloc_page(GFP_KERNEL); |
3485 | if (!req_page) | |
3486 | return -ENOMEM; | |
04017e29 | 3487 | |
ecd4a68a | 3488 | memcpy(page_address(req_page), outbound, outbound_size); |
04017e29 | 3489 | } |
36be9a76 | 3490 | |
ecd4a68a ID |
3491 | reply_page = alloc_page(GFP_KERNEL); |
3492 | if (!reply_page) { | |
3493 | if (req_page) | |
3494 | __free_page(req_page); | |
3495 | return -ENOMEM; | |
3496 | } | |
57385b51 | 3497 | |
ecd4a68a ID |
3498 | ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
3499 | CEPH_OSD_FLAG_READ, req_page, outbound_size, | |
3500 | reply_page, &inbound_size); | |
3501 | if (!ret) { | |
3502 | memcpy(inbound, page_address(reply_page), inbound_size); | |
3503 | ret = inbound_size; | |
3504 | } | |
36be9a76 | 3505 | |
ecd4a68a ID |
3506 | if (req_page) |
3507 | __free_page(req_page); | |
3508 | __free_page(reply_page); | |
36be9a76 AE |
3509 | return ret; |
3510 | } | |
3511 | ||
ed95b21a ID |
3512 | /* |
3513 | * lock_rwsem must be held for read | |
3514 | */ | |
3515 | static void rbd_wait_state_locked(struct rbd_device *rbd_dev) | |
3516 | { | |
3517 | DEFINE_WAIT(wait); | |
3518 | ||
3519 | do { | |
3520 | /* | |
3521 | * Note the use of mod_delayed_work() in rbd_acquire_lock() | |
3522 | * and cancel_delayed_work() in wake_requests(). | |
3523 | */ | |
3524 | dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); | |
3525 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); | |
3526 | prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, | |
3527 | TASK_UNINTERRUPTIBLE); | |
3528 | up_read(&rbd_dev->lock_rwsem); | |
3529 | schedule(); | |
3530 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded ID |
3531 | } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
3532 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)); | |
3533 | ||
ed95b21a ID |
3534 | finish_wait(&rbd_dev->lock_waitq, &wait); |
3535 | } | |
3536 | ||
7ad18afa | 3537 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3538 | { |
7ad18afa CH |
3539 | struct request *rq = blk_mq_rq_from_pdu(work); |
3540 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3541 | struct rbd_img_request *img_request; |
4e752f0a | 3542 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3543 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3544 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3545 | enum obj_operation_type op_type; |
4e752f0a | 3546 | u64 mapping_size; |
80de1912 | 3547 | bool must_be_locked; |
bf0d5f50 AE |
3548 | int result; |
3549 | ||
aebf526b CH |
3550 | switch (req_op(rq)) { |
3551 | case REQ_OP_DISCARD: | |
6ac56951 | 3552 | case REQ_OP_WRITE_ZEROES: |
90e98c52 | 3553 | op_type = OBJ_OP_DISCARD; |
aebf526b CH |
3554 | break; |
3555 | case REQ_OP_WRITE: | |
6d2940c8 | 3556 | op_type = OBJ_OP_WRITE; |
aebf526b CH |
3557 | break; |
3558 | case REQ_OP_READ: | |
6d2940c8 | 3559 | op_type = OBJ_OP_READ; |
aebf526b CH |
3560 | break; |
3561 | default: | |
3562 | dout("%s: non-fs request type %d\n", __func__, req_op(rq)); | |
3563 | result = -EIO; | |
3564 | goto err; | |
3565 | } | |
6d2940c8 | 3566 | |
bc1ecc65 | 3567 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3568 | |
bc1ecc65 ID |
3569 | if (!length) { |
3570 | dout("%s: zero-length request\n", __func__); | |
3571 | result = 0; | |
3572 | goto err_rq; | |
3573 | } | |
bf0d5f50 | 3574 | |
9568c93e ID |
3575 | rbd_assert(op_type == OBJ_OP_READ || |
3576 | rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
4dda41d3 | 3577 | |
bc1ecc65 ID |
3578 | /* |
3579 | * Quit early if the mapped snapshot no longer exists. It's | |
3580 | * still possible the snapshot will have disappeared by the | |
3581 | * time our request arrives at the osd, but there's no sense in | |
3582 | * sending it if we already know. | |
3583 | */ | |
3584 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3585 | dout("request for non-existent snapshot"); | |
3586 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3587 | result = -ENXIO; | |
3588 | goto err_rq; | |
3589 | } | |
4dda41d3 | 3590 | |
bc1ecc65 ID |
3591 | if (offset && length > U64_MAX - offset + 1) { |
3592 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3593 | length); | |
3594 | result = -EINVAL; | |
3595 | goto err_rq; /* Shouldn't happen */ | |
3596 | } | |
4dda41d3 | 3597 | |
7ad18afa CH |
3598 | blk_mq_start_request(rq); |
3599 | ||
4e752f0a JD |
3600 | down_read(&rbd_dev->header_rwsem); |
3601 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3602 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3603 | snapc = rbd_dev->header.snapc; |
3604 | ceph_get_snap_context(snapc); | |
3605 | } | |
3606 | up_read(&rbd_dev->header_rwsem); | |
3607 | ||
3608 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3609 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3610 | length, mapping_size); |
bc1ecc65 ID |
3611 | result = -EIO; |
3612 | goto err_rq; | |
3613 | } | |
bf0d5f50 | 3614 | |
f9bebd58 ID |
3615 | must_be_locked = |
3616 | (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && | |
3617 | (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); | |
ed95b21a ID |
3618 | if (must_be_locked) { |
3619 | down_read(&rbd_dev->lock_rwsem); | |
87c0fded | 3620 | if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
e010dd0a ID |
3621 | !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3622 | if (rbd_dev->opts->exclusive) { | |
3623 | rbd_warn(rbd_dev, "exclusive lock required"); | |
3624 | result = -EROFS; | |
3625 | goto err_unlock; | |
3626 | } | |
ed95b21a | 3627 | rbd_wait_state_locked(rbd_dev); |
e010dd0a | 3628 | } |
87c0fded ID |
3629 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
3630 | result = -EBLACKLISTED; | |
3631 | goto err_unlock; | |
3632 | } | |
ed95b21a ID |
3633 | } |
3634 | ||
dfd9875f | 3635 | img_request = rbd_img_request_create(rbd_dev, op_type, snapc); |
bc1ecc65 ID |
3636 | if (!img_request) { |
3637 | result = -ENOMEM; | |
ed95b21a | 3638 | goto err_unlock; |
bc1ecc65 ID |
3639 | } |
3640 | img_request->rq = rq; | |
70b16db8 | 3641 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3642 | |
90e98c52 | 3643 | if (op_type == OBJ_OP_DISCARD) |
5a237819 ID |
3644 | result = rbd_img_fill_nodata(img_request, offset, length); |
3645 | else | |
3646 | result = rbd_img_fill_from_bio(img_request, offset, length, | |
3647 | rq->bio); | |
bc1ecc65 ID |
3648 | if (result) |
3649 | goto err_img_request; | |
bf0d5f50 | 3650 | |
efbd1a11 | 3651 | rbd_img_request_submit(img_request); |
ed95b21a ID |
3652 | if (must_be_locked) |
3653 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 | 3654 | return; |
bf0d5f50 | 3655 | |
bc1ecc65 ID |
3656 | err_img_request: |
3657 | rbd_img_request_put(img_request); | |
ed95b21a ID |
3658 | err_unlock: |
3659 | if (must_be_locked) | |
3660 | up_read(&rbd_dev->lock_rwsem); | |
bc1ecc65 ID |
3661 | err_rq: |
3662 | if (result) | |
3663 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3664 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3665 | ceph_put_snap_context(snapc); |
7ad18afa | 3666 | err: |
2a842aca | 3667 | blk_mq_end_request(rq, errno_to_blk_status(result)); |
bc1ecc65 | 3668 | } |
bf0d5f50 | 3669 | |
fc17b653 | 3670 | static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
7ad18afa | 3671 | const struct blk_mq_queue_data *bd) |
bc1ecc65 | 3672 | { |
7ad18afa CH |
3673 | struct request *rq = bd->rq; |
3674 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3675 | |
7ad18afa | 3676 | queue_work(rbd_wq, work); |
fc17b653 | 3677 | return BLK_STS_OK; |
bf0d5f50 AE |
3678 | } |
3679 | ||
602adf40 YS |
3680 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3681 | { | |
5769ed0c ID |
3682 | blk_cleanup_queue(rbd_dev->disk->queue); |
3683 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
3684 | put_disk(rbd_dev->disk); | |
a0cab924 | 3685 | rbd_dev->disk = NULL; |
602adf40 YS |
3686 | } |
3687 | ||
788e2df3 | 3688 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
fe5478e0 ID |
3689 | struct ceph_object_id *oid, |
3690 | struct ceph_object_locator *oloc, | |
3691 | void *buf, int buf_len) | |
788e2df3 AE |
3692 | |
3693 | { | |
fe5478e0 ID |
3694 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3695 | struct ceph_osd_request *req; | |
3696 | struct page **pages; | |
3697 | int num_pages = calc_pages_for(0, buf_len); | |
788e2df3 AE |
3698 | int ret; |
3699 | ||
fe5478e0 ID |
3700 | req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
3701 | if (!req) | |
3702 | return -ENOMEM; | |
788e2df3 | 3703 | |
fe5478e0 ID |
3704 | ceph_oid_copy(&req->r_base_oid, oid); |
3705 | ceph_oloc_copy(&req->r_base_oloc, oloc); | |
3706 | req->r_flags = CEPH_OSD_FLAG_READ; | |
430c28c3 | 3707 | |
fe5478e0 | 3708 | ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
788e2df3 | 3709 | if (ret) |
fe5478e0 | 3710 | goto out_req; |
788e2df3 | 3711 | |
fe5478e0 ID |
3712 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
3713 | if (IS_ERR(pages)) { | |
3714 | ret = PTR_ERR(pages); | |
3715 | goto out_req; | |
3716 | } | |
1ceae7ef | 3717 | |
fe5478e0 ID |
3718 | osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
3719 | osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, | |
3720 | true); | |
3721 | ||
3722 | ceph_osdc_start_request(osdc, req, false); | |
3723 | ret = ceph_osdc_wait_request(osdc, req); | |
3724 | if (ret >= 0) | |
3725 | ceph_copy_from_page_vector(pages, buf, 0, ret); | |
788e2df3 | 3726 | |
fe5478e0 ID |
3727 | out_req: |
3728 | ceph_osdc_put_request(req); | |
788e2df3 AE |
3729 | return ret; |
3730 | } | |
3731 | ||
602adf40 | 3732 | /* |
662518b1 AE |
3733 | * Read the complete header for the given rbd device. On successful |
3734 | * return, the rbd_dev->header field will contain up-to-date | |
3735 | * information about the image. | |
602adf40 | 3736 | */ |
99a41ebc | 3737 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3738 | { |
4156d998 | 3739 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3740 | u32 snap_count = 0; |
4156d998 AE |
3741 | u64 names_size = 0; |
3742 | u32 want_count; | |
3743 | int ret; | |
602adf40 | 3744 | |
00f1f36f | 3745 | /* |
4156d998 AE |
3746 | * The complete header will include an array of its 64-bit |
3747 | * snapshot ids, followed by the names of those snapshots as | |
3748 | * a contiguous block of NUL-terminated strings. Note that | |
3749 | * the number of snapshots could change by the time we read | |
3750 | * it in, in which case we re-read it. | |
00f1f36f | 3751 | */ |
4156d998 AE |
3752 | do { |
3753 | size_t size; | |
3754 | ||
3755 | kfree(ondisk); | |
3756 | ||
3757 | size = sizeof (*ondisk); | |
3758 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3759 | size += names_size; | |
3760 | ondisk = kmalloc(size, GFP_KERNEL); | |
3761 | if (!ondisk) | |
662518b1 | 3762 | return -ENOMEM; |
4156d998 | 3763 | |
fe5478e0 ID |
3764 | ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
3765 | &rbd_dev->header_oloc, ondisk, size); | |
4156d998 | 3766 | if (ret < 0) |
662518b1 | 3767 | goto out; |
c0cd10db | 3768 | if ((size_t)ret < size) { |
4156d998 | 3769 | ret = -ENXIO; |
06ecc6cb AE |
3770 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3771 | size, ret); | |
662518b1 | 3772 | goto out; |
4156d998 AE |
3773 | } |
3774 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3775 | ret = -ENXIO; | |
06ecc6cb | 3776 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3777 | goto out; |
81e759fb | 3778 | } |
602adf40 | 3779 | |
4156d998 AE |
3780 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3781 | want_count = snap_count; | |
3782 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3783 | } while (snap_count != want_count); | |
00f1f36f | 3784 | |
662518b1 AE |
3785 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3786 | out: | |
4156d998 AE |
3787 | kfree(ondisk); |
3788 | ||
3789 | return ret; | |
602adf40 YS |
3790 | } |
3791 | ||
15228ede AE |
3792 | /* |
3793 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3794 | * has disappeared from the (just updated) snapshot context. | |
3795 | */ | |
3796 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3797 | { | |
3798 | u64 snap_id; | |
3799 | ||
3800 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3801 | return; | |
3802 | ||
3803 | snap_id = rbd_dev->spec->snap_id; | |
3804 | if (snap_id == CEPH_NOSNAP) | |
3805 | return; | |
3806 | ||
3807 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3808 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3809 | } | |
3810 | ||
9875201e JD |
3811 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3812 | { | |
3813 | sector_t size; | |
9875201e JD |
3814 | |
3815 | /* | |
811c6688 ID |
3816 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3817 | * try to update its size. If REMOVING is set, updating size | |
3818 | * is just useless work since the device can't be opened. | |
9875201e | 3819 | */ |
811c6688 ID |
3820 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3821 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3822 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3823 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3824 | set_capacity(rbd_dev->disk, size); | |
3825 | revalidate_disk(rbd_dev->disk); | |
3826 | } | |
3827 | } | |
3828 | ||
cc4a38bd | 3829 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3830 | { |
e627db08 | 3831 | u64 mapping_size; |
1fe5e993 AE |
3832 | int ret; |
3833 | ||
cfbf6377 | 3834 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3835 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3836 | |
3837 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 3838 | if (ret) |
73e39e4d | 3839 | goto out; |
15228ede | 3840 | |
e8f59b59 ID |
3841 | /* |
3842 | * If there is a parent, see if it has disappeared due to the | |
3843 | * mapped image getting flattened. | |
3844 | */ | |
3845 | if (rbd_dev->parent) { | |
3846 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3847 | if (ret) | |
73e39e4d | 3848 | goto out; |
e8f59b59 ID |
3849 | } |
3850 | ||
5ff1108c | 3851 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 3852 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
3853 | } else { |
3854 | /* validate mapped snapshot's EXISTS flag */ | |
3855 | rbd_exists_validate(rbd_dev); | |
3856 | } | |
15228ede | 3857 | |
73e39e4d | 3858 | out: |
cfbf6377 | 3859 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 3860 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 3861 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3862 | |
73e39e4d | 3863 | return ret; |
1fe5e993 AE |
3864 | } |
3865 | ||
d6296d39 CH |
3866 | static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
3867 | unsigned int hctx_idx, unsigned int numa_node) | |
7ad18afa CH |
3868 | { |
3869 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
3870 | ||
3871 | INIT_WORK(work, rbd_queue_workfn); | |
3872 | return 0; | |
3873 | } | |
3874 | ||
f363b089 | 3875 | static const struct blk_mq_ops rbd_mq_ops = { |
7ad18afa | 3876 | .queue_rq = rbd_queue_rq, |
7ad18afa CH |
3877 | .init_request = rbd_init_request, |
3878 | }; | |
3879 | ||
602adf40 YS |
3880 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3881 | { | |
3882 | struct gendisk *disk; | |
3883 | struct request_queue *q; | |
593a9e7b | 3884 | u64 segment_size; |
7ad18afa | 3885 | int err; |
602adf40 | 3886 | |
602adf40 | 3887 | /* create gendisk info */ |
7e513d43 ID |
3888 | disk = alloc_disk(single_major ? |
3889 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3890 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3891 | if (!disk) |
1fcdb8aa | 3892 | return -ENOMEM; |
602adf40 | 3893 | |
f0f8cef5 | 3894 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3895 | rbd_dev->dev_id); |
602adf40 | 3896 | disk->major = rbd_dev->major; |
dd82fff1 | 3897 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3898 | if (single_major) |
3899 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3900 | disk->fops = &rbd_bd_ops; |
3901 | disk->private_data = rbd_dev; | |
3902 | ||
7ad18afa CH |
3903 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
3904 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 3905 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 3906 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 3907 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
3908 | rbd_dev->tag_set.nr_hw_queues = 1; |
3909 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
3910 | ||
3911 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
3912 | if (err) | |
602adf40 | 3913 | goto out_disk; |
029bcbd8 | 3914 | |
7ad18afa CH |
3915 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
3916 | if (IS_ERR(q)) { | |
3917 | err = PTR_ERR(q); | |
3918 | goto out_tag_set; | |
3919 | } | |
3920 | ||
d8a2c89c ID |
3921 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
3922 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ | |
593a9e7b | 3923 | |
029bcbd8 | 3924 | /* set io sizes to object size */ |
593a9e7b AE |
3925 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3926 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
0d9fde4f | 3927 | q->limits.max_sectors = queue_max_hw_sectors(q); |
21acdf45 | 3928 | blk_queue_max_segments(q, USHRT_MAX); |
24f1df60 | 3929 | blk_queue_max_segment_size(q, UINT_MAX); |
593a9e7b AE |
3930 | blk_queue_io_min(q, segment_size); |
3931 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3932 | |
90e98c52 GZ |
3933 | /* enable the discard support */ |
3934 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
3935 | q->limits.discard_granularity = segment_size; | |
2bb4cd5c | 3936 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
6ac56951 | 3937 | blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE); |
90e98c52 | 3938 | |
bae818ee | 3939 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
dc3b17cc | 3940 | q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
bae818ee | 3941 | |
5769ed0c ID |
3942 | /* |
3943 | * disk_release() expects a queue ref from add_disk() and will | |
3944 | * put it. Hold an extra ref until add_disk() is called. | |
3945 | */ | |
3946 | WARN_ON(!blk_get_queue(q)); | |
602adf40 | 3947 | disk->queue = q; |
602adf40 YS |
3948 | q->queuedata = rbd_dev; |
3949 | ||
3950 | rbd_dev->disk = disk; | |
602adf40 | 3951 | |
602adf40 | 3952 | return 0; |
7ad18afa CH |
3953 | out_tag_set: |
3954 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
3955 | out_disk: |
3956 | put_disk(disk); | |
7ad18afa | 3957 | return err; |
602adf40 YS |
3958 | } |
3959 | ||
dfc5606d YS |
3960 | /* |
3961 | sysfs | |
3962 | */ | |
3963 | ||
593a9e7b AE |
3964 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3965 | { | |
3966 | return container_of(dev, struct rbd_device, dev); | |
3967 | } | |
3968 | ||
dfc5606d YS |
3969 | static ssize_t rbd_size_show(struct device *dev, |
3970 | struct device_attribute *attr, char *buf) | |
3971 | { | |
593a9e7b | 3972 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3973 | |
fc71d833 AE |
3974 | return sprintf(buf, "%llu\n", |
3975 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3976 | } |
3977 | ||
34b13184 AE |
3978 | /* |
3979 | * Note this shows the features for whatever's mapped, which is not | |
3980 | * necessarily the base image. | |
3981 | */ | |
3982 | static ssize_t rbd_features_show(struct device *dev, | |
3983 | struct device_attribute *attr, char *buf) | |
3984 | { | |
3985 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3986 | ||
3987 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3988 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3989 | } |
3990 | ||
dfc5606d YS |
3991 | static ssize_t rbd_major_show(struct device *dev, |
3992 | struct device_attribute *attr, char *buf) | |
3993 | { | |
593a9e7b | 3994 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3995 | |
fc71d833 AE |
3996 | if (rbd_dev->major) |
3997 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3998 | ||
3999 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
4000 | } |
4001 | ||
4002 | static ssize_t rbd_minor_show(struct device *dev, | |
4003 | struct device_attribute *attr, char *buf) | |
4004 | { | |
4005 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 4006 | |
dd82fff1 | 4007 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
4008 | } |
4009 | ||
005a07bf ID |
4010 | static ssize_t rbd_client_addr_show(struct device *dev, |
4011 | struct device_attribute *attr, char *buf) | |
4012 | { | |
4013 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4014 | struct ceph_entity_addr *client_addr = | |
4015 | ceph_client_addr(rbd_dev->rbd_client->client); | |
4016 | ||
4017 | return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, | |
4018 | le32_to_cpu(client_addr->nonce)); | |
4019 | } | |
4020 | ||
dfc5606d YS |
4021 | static ssize_t rbd_client_id_show(struct device *dev, |
4022 | struct device_attribute *attr, char *buf) | |
602adf40 | 4023 | { |
593a9e7b | 4024 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4025 | |
1dbb4399 | 4026 | return sprintf(buf, "client%lld\n", |
033268a5 | 4027 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
4028 | } |
4029 | ||
267fb90b MC |
4030 | static ssize_t rbd_cluster_fsid_show(struct device *dev, |
4031 | struct device_attribute *attr, char *buf) | |
4032 | { | |
4033 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4034 | ||
4035 | return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); | |
4036 | } | |
4037 | ||
0d6d1e9c MC |
4038 | static ssize_t rbd_config_info_show(struct device *dev, |
4039 | struct device_attribute *attr, char *buf) | |
4040 | { | |
4041 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4042 | ||
4043 | return sprintf(buf, "%s\n", rbd_dev->config_info); | |
602adf40 YS |
4044 | } |
4045 | ||
dfc5606d YS |
4046 | static ssize_t rbd_pool_show(struct device *dev, |
4047 | struct device_attribute *attr, char *buf) | |
602adf40 | 4048 | { |
593a9e7b | 4049 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4050 | |
0d7dbfce | 4051 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
4052 | } |
4053 | ||
9bb2f334 AE |
4054 | static ssize_t rbd_pool_id_show(struct device *dev, |
4055 | struct device_attribute *attr, char *buf) | |
4056 | { | |
4057 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4058 | ||
0d7dbfce | 4059 | return sprintf(buf, "%llu\n", |
fc71d833 | 4060 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
4061 | } |
4062 | ||
dfc5606d YS |
4063 | static ssize_t rbd_name_show(struct device *dev, |
4064 | struct device_attribute *attr, char *buf) | |
4065 | { | |
593a9e7b | 4066 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4067 | |
a92ffdf8 AE |
4068 | if (rbd_dev->spec->image_name) |
4069 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
4070 | ||
4071 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
4072 | } |
4073 | ||
589d30e0 AE |
4074 | static ssize_t rbd_image_id_show(struct device *dev, |
4075 | struct device_attribute *attr, char *buf) | |
4076 | { | |
4077 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4078 | ||
0d7dbfce | 4079 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4080 | } |
4081 | ||
34b13184 AE |
4082 | /* |
4083 | * Shows the name of the currently-mapped snapshot (or | |
4084 | * RBD_SNAP_HEAD_NAME for the base image). | |
4085 | */ | |
dfc5606d YS |
4086 | static ssize_t rbd_snap_show(struct device *dev, |
4087 | struct device_attribute *attr, | |
4088 | char *buf) | |
4089 | { | |
593a9e7b | 4090 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 4091 | |
0d7dbfce | 4092 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
4093 | } |
4094 | ||
92a58671 MC |
4095 | static ssize_t rbd_snap_id_show(struct device *dev, |
4096 | struct device_attribute *attr, char *buf) | |
4097 | { | |
4098 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4099 | ||
4100 | return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); | |
4101 | } | |
4102 | ||
86b00e0d | 4103 | /* |
ff96128f ID |
4104 | * For a v2 image, shows the chain of parent images, separated by empty |
4105 | * lines. For v1 images or if there is no parent, shows "(no parent | |
4106 | * image)". | |
86b00e0d AE |
4107 | */ |
4108 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
4109 | struct device_attribute *attr, |
4110 | char *buf) | |
86b00e0d AE |
4111 | { |
4112 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 4113 | ssize_t count = 0; |
86b00e0d | 4114 | |
ff96128f | 4115 | if (!rbd_dev->parent) |
86b00e0d AE |
4116 | return sprintf(buf, "(no parent image)\n"); |
4117 | ||
ff96128f ID |
4118 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
4119 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
4120 | ||
4121 | count += sprintf(&buf[count], "%s" | |
4122 | "pool_id %llu\npool_name %s\n" | |
4123 | "image_id %s\nimage_name %s\n" | |
4124 | "snap_id %llu\nsnap_name %s\n" | |
4125 | "overlap %llu\n", | |
4126 | !count ? "" : "\n", /* first? */ | |
4127 | spec->pool_id, spec->pool_name, | |
4128 | spec->image_id, spec->image_name ?: "(unknown)", | |
4129 | spec->snap_id, spec->snap_name, | |
4130 | rbd_dev->parent_overlap); | |
4131 | } | |
4132 | ||
4133 | return count; | |
86b00e0d AE |
4134 | } |
4135 | ||
dfc5606d YS |
4136 | static ssize_t rbd_image_refresh(struct device *dev, |
4137 | struct device_attribute *attr, | |
4138 | const char *buf, | |
4139 | size_t size) | |
4140 | { | |
593a9e7b | 4141 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 4142 | int ret; |
602adf40 | 4143 | |
cc4a38bd | 4144 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 4145 | if (ret) |
52bb1f9b | 4146 | return ret; |
b813623a | 4147 | |
52bb1f9b | 4148 | return size; |
dfc5606d | 4149 | } |
602adf40 | 4150 | |
dfc5606d | 4151 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 4152 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 4153 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 4154 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
005a07bf | 4155 | static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
dfc5606d | 4156 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
267fb90b | 4157 | static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
0d6d1e9c | 4158 | static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL); |
dfc5606d | 4159 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
9bb2f334 | 4160 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 4161 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 4162 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
4163 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
4164 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
92a58671 | 4165 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
86b00e0d | 4166 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
4167 | |
4168 | static struct attribute *rbd_attrs[] = { | |
4169 | &dev_attr_size.attr, | |
34b13184 | 4170 | &dev_attr_features.attr, |
dfc5606d | 4171 | &dev_attr_major.attr, |
dd82fff1 | 4172 | &dev_attr_minor.attr, |
005a07bf | 4173 | &dev_attr_client_addr.attr, |
dfc5606d | 4174 | &dev_attr_client_id.attr, |
267fb90b | 4175 | &dev_attr_cluster_fsid.attr, |
0d6d1e9c | 4176 | &dev_attr_config_info.attr, |
dfc5606d | 4177 | &dev_attr_pool.attr, |
9bb2f334 | 4178 | &dev_attr_pool_id.attr, |
dfc5606d | 4179 | &dev_attr_name.attr, |
589d30e0 | 4180 | &dev_attr_image_id.attr, |
dfc5606d | 4181 | &dev_attr_current_snap.attr, |
92a58671 | 4182 | &dev_attr_snap_id.attr, |
86b00e0d | 4183 | &dev_attr_parent.attr, |
dfc5606d | 4184 | &dev_attr_refresh.attr, |
dfc5606d YS |
4185 | NULL |
4186 | }; | |
4187 | ||
4188 | static struct attribute_group rbd_attr_group = { | |
4189 | .attrs = rbd_attrs, | |
4190 | }; | |
4191 | ||
4192 | static const struct attribute_group *rbd_attr_groups[] = { | |
4193 | &rbd_attr_group, | |
4194 | NULL | |
4195 | }; | |
4196 | ||
6cac4695 | 4197 | static void rbd_dev_release(struct device *dev); |
dfc5606d | 4198 | |
b9942bc9 | 4199 | static const struct device_type rbd_device_type = { |
dfc5606d YS |
4200 | .name = "rbd", |
4201 | .groups = rbd_attr_groups, | |
6cac4695 | 4202 | .release = rbd_dev_release, |
dfc5606d YS |
4203 | }; |
4204 | ||
8b8fb99c AE |
4205 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
4206 | { | |
4207 | kref_get(&spec->kref); | |
4208 | ||
4209 | return spec; | |
4210 | } | |
4211 | ||
4212 | static void rbd_spec_free(struct kref *kref); | |
4213 | static void rbd_spec_put(struct rbd_spec *spec) | |
4214 | { | |
4215 | if (spec) | |
4216 | kref_put(&spec->kref, rbd_spec_free); | |
4217 | } | |
4218 | ||
4219 | static struct rbd_spec *rbd_spec_alloc(void) | |
4220 | { | |
4221 | struct rbd_spec *spec; | |
4222 | ||
4223 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4224 | if (!spec) | |
4225 | return NULL; | |
04077599 ID |
4226 | |
4227 | spec->pool_id = CEPH_NOPOOL; | |
4228 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4229 | kref_init(&spec->kref); |
4230 | ||
8b8fb99c AE |
4231 | return spec; |
4232 | } | |
4233 | ||
4234 | static void rbd_spec_free(struct kref *kref) | |
4235 | { | |
4236 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4237 | ||
4238 | kfree(spec->pool_name); | |
4239 | kfree(spec->image_id); | |
4240 | kfree(spec->image_name); | |
4241 | kfree(spec->snap_name); | |
4242 | kfree(spec); | |
4243 | } | |
4244 | ||
1643dfa4 | 4245 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4246 | { |
99d16943 | 4247 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
ed95b21a | 4248 | WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
dd5ac32d | 4249 | |
c41d13a3 | 4250 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4251 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
0d6d1e9c | 4252 | kfree(rbd_dev->config_info); |
c41d13a3 | 4253 | |
dd5ac32d ID |
4254 | rbd_put_client(rbd_dev->rbd_client); |
4255 | rbd_spec_put(rbd_dev->spec); | |
4256 | kfree(rbd_dev->opts); | |
4257 | kfree(rbd_dev); | |
1643dfa4 ID |
4258 | } |
4259 | ||
4260 | static void rbd_dev_release(struct device *dev) | |
4261 | { | |
4262 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4263 | bool need_put = !!rbd_dev->opts; | |
4264 | ||
4265 | if (need_put) { | |
4266 | destroy_workqueue(rbd_dev->task_wq); | |
4267 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4268 | } | |
4269 | ||
4270 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4271 | |
4272 | /* | |
4273 | * This is racy, but way better than putting module outside of | |
4274 | * the release callback. The race window is pretty small, so | |
4275 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4276 | */ | |
4277 | if (need_put) | |
4278 | module_put(THIS_MODULE); | |
4279 | } | |
4280 | ||
1643dfa4 ID |
4281 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4282 | struct rbd_spec *spec) | |
c53d5893 AE |
4283 | { |
4284 | struct rbd_device *rbd_dev; | |
4285 | ||
1643dfa4 | 4286 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4287 | if (!rbd_dev) |
4288 | return NULL; | |
4289 | ||
4290 | spin_lock_init(&rbd_dev->lock); | |
4291 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4292 | init_rwsem(&rbd_dev->header_rwsem); |
4293 | ||
7e97332e | 4294 | rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
c41d13a3 | 4295 | ceph_oid_init(&rbd_dev->header_oid); |
431a02cd | 4296 | rbd_dev->header_oloc.pool = spec->pool_id; |
c41d13a3 | 4297 | |
99d16943 ID |
4298 | mutex_init(&rbd_dev->watch_mutex); |
4299 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4300 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4301 | ||
ed95b21a ID |
4302 | init_rwsem(&rbd_dev->lock_rwsem); |
4303 | rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; | |
4304 | INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); | |
4305 | INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); | |
4306 | INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); | |
4307 | INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); | |
4308 | init_waitqueue_head(&rbd_dev->lock_waitq); | |
4309 | ||
dd5ac32d ID |
4310 | rbd_dev->dev.bus = &rbd_bus_type; |
4311 | rbd_dev->dev.type = &rbd_device_type; | |
4312 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4313 | device_initialize(&rbd_dev->dev); |
4314 | ||
c53d5893 | 4315 | rbd_dev->rbd_client = rbdc; |
d147543d | 4316 | rbd_dev->spec = spec; |
0903e875 | 4317 | |
1643dfa4 ID |
4318 | return rbd_dev; |
4319 | } | |
4320 | ||
4321 | /* | |
4322 | * Create a mapping rbd_dev. | |
4323 | */ | |
4324 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4325 | struct rbd_spec *spec, | |
4326 | struct rbd_options *opts) | |
4327 | { | |
4328 | struct rbd_device *rbd_dev; | |
4329 | ||
4330 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4331 | if (!rbd_dev) | |
4332 | return NULL; | |
4333 | ||
4334 | rbd_dev->opts = opts; | |
4335 | ||
4336 | /* get an id and fill in device name */ | |
4337 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4338 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4339 | GFP_KERNEL); | |
4340 | if (rbd_dev->dev_id < 0) | |
4341 | goto fail_rbd_dev; | |
4342 | ||
4343 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4344 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4345 | rbd_dev->name); | |
4346 | if (!rbd_dev->task_wq) | |
4347 | goto fail_dev_id; | |
dd5ac32d | 4348 | |
1643dfa4 ID |
4349 | /* we have a ref from do_rbd_add() */ |
4350 | __module_get(THIS_MODULE); | |
dd5ac32d | 4351 | |
1643dfa4 | 4352 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
c53d5893 | 4353 | return rbd_dev; |
1643dfa4 ID |
4354 | |
4355 | fail_dev_id: | |
4356 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4357 | fail_rbd_dev: | |
4358 | rbd_dev_free(rbd_dev); | |
4359 | return NULL; | |
c53d5893 AE |
4360 | } |
4361 | ||
4362 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4363 | { | |
dd5ac32d ID |
4364 | if (rbd_dev) |
4365 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4366 | } |
4367 | ||
9d475de5 AE |
4368 | /* |
4369 | * Get the size and object order for an image snapshot, or if | |
4370 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4371 | * image. | |
4372 | */ | |
4373 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4374 | u8 *order, u64 *snap_size) | |
4375 | { | |
4376 | __le64 snapid = cpu_to_le64(snap_id); | |
4377 | int ret; | |
4378 | struct { | |
4379 | u8 order; | |
4380 | __le64 size; | |
4381 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4382 | ||
ecd4a68a ID |
4383 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4384 | &rbd_dev->header_oloc, "get_size", | |
4385 | &snapid, sizeof(snapid), | |
4386 | &size_buf, sizeof(size_buf)); | |
36be9a76 | 4387 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4388 | if (ret < 0) |
4389 | return ret; | |
57385b51 AE |
4390 | if (ret < sizeof (size_buf)) |
4391 | return -ERANGE; | |
9d475de5 | 4392 | |
c3545579 | 4393 | if (order) { |
c86f86e9 | 4394 | *order = size_buf.order; |
c3545579 JD |
4395 | dout(" order %u", (unsigned int)*order); |
4396 | } | |
9d475de5 AE |
4397 | *snap_size = le64_to_cpu(size_buf.size); |
4398 | ||
c3545579 JD |
4399 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4400 | (unsigned long long)snap_id, | |
57385b51 | 4401 | (unsigned long long)*snap_size); |
9d475de5 AE |
4402 | |
4403 | return 0; | |
4404 | } | |
4405 | ||
4406 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4407 | { | |
4408 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4409 | &rbd_dev->header.obj_order, | |
4410 | &rbd_dev->header.image_size); | |
4411 | } | |
4412 | ||
1e130199 AE |
4413 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4414 | { | |
4415 | void *reply_buf; | |
4416 | int ret; | |
4417 | void *p; | |
4418 | ||
4419 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4420 | if (!reply_buf) | |
4421 | return -ENOMEM; | |
4422 | ||
ecd4a68a ID |
4423 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4424 | &rbd_dev->header_oloc, "get_object_prefix", | |
4425 | NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); | |
36be9a76 | 4426 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4427 | if (ret < 0) |
4428 | goto out; | |
4429 | ||
4430 | p = reply_buf; | |
4431 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4432 | p + ret, NULL, GFP_NOIO); |
4433 | ret = 0; | |
1e130199 AE |
4434 | |
4435 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4436 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4437 | rbd_dev->header.object_prefix = NULL; | |
4438 | } else { | |
4439 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4440 | } | |
1e130199 AE |
4441 | out: |
4442 | kfree(reply_buf); | |
4443 | ||
4444 | return ret; | |
4445 | } | |
4446 | ||
b1b5402a AE |
4447 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4448 | u64 *snap_features) | |
4449 | { | |
4450 | __le64 snapid = cpu_to_le64(snap_id); | |
4451 | struct { | |
4452 | __le64 features; | |
4453 | __le64 incompat; | |
4157976b | 4454 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4455 | u64 unsup; |
b1b5402a AE |
4456 | int ret; |
4457 | ||
ecd4a68a ID |
4458 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4459 | &rbd_dev->header_oloc, "get_features", | |
4460 | &snapid, sizeof(snapid), | |
4461 | &features_buf, sizeof(features_buf)); | |
36be9a76 | 4462 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4463 | if (ret < 0) |
4464 | return ret; | |
57385b51 AE |
4465 | if (ret < sizeof (features_buf)) |
4466 | return -ERANGE; | |
d889140c | 4467 | |
d3767f0f ID |
4468 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4469 | if (unsup) { | |
4470 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4471 | unsup); | |
b8f5c6ed | 4472 | return -ENXIO; |
d3767f0f | 4473 | } |
d889140c | 4474 | |
b1b5402a AE |
4475 | *snap_features = le64_to_cpu(features_buf.features); |
4476 | ||
4477 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4478 | (unsigned long long)snap_id, |
4479 | (unsigned long long)*snap_features, | |
4480 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4481 | |
4482 | return 0; | |
4483 | } | |
4484 | ||
4485 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4486 | { | |
4487 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4488 | &rbd_dev->header.features); | |
4489 | } | |
4490 | ||
86b00e0d AE |
4491 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4492 | { | |
4493 | struct rbd_spec *parent_spec; | |
4494 | size_t size; | |
4495 | void *reply_buf = NULL; | |
4496 | __le64 snapid; | |
4497 | void *p; | |
4498 | void *end; | |
642a2537 | 4499 | u64 pool_id; |
86b00e0d | 4500 | char *image_id; |
3b5cf2a2 | 4501 | u64 snap_id; |
86b00e0d | 4502 | u64 overlap; |
86b00e0d AE |
4503 | int ret; |
4504 | ||
4505 | parent_spec = rbd_spec_alloc(); | |
4506 | if (!parent_spec) | |
4507 | return -ENOMEM; | |
4508 | ||
4509 | size = sizeof (__le64) + /* pool_id */ | |
4510 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4511 | sizeof (__le64) + /* snap_id */ | |
4512 | sizeof (__le64); /* overlap */ | |
4513 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4514 | if (!reply_buf) { | |
4515 | ret = -ENOMEM; | |
4516 | goto out_err; | |
4517 | } | |
4518 | ||
4d9b67cd | 4519 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
ecd4a68a ID |
4520 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4521 | &rbd_dev->header_oloc, "get_parent", | |
4522 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4523 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4524 | if (ret < 0) |
4525 | goto out_err; | |
4526 | ||
86b00e0d | 4527 | p = reply_buf; |
57385b51 AE |
4528 | end = reply_buf + ret; |
4529 | ret = -ERANGE; | |
642a2537 | 4530 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4531 | if (pool_id == CEPH_NOPOOL) { |
4532 | /* | |
4533 | * Either the parent never existed, or we have | |
4534 | * record of it but the image got flattened so it no | |
4535 | * longer has a parent. When the parent of a | |
4536 | * layered image disappears we immediately set the | |
4537 | * overlap to 0. The effect of this is that all new | |
4538 | * requests will be treated as if the image had no | |
4539 | * parent. | |
4540 | */ | |
4541 | if (rbd_dev->parent_overlap) { | |
4542 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4543 | rbd_dev_parent_put(rbd_dev); |
4544 | pr_info("%s: clone image has been flattened\n", | |
4545 | rbd_dev->disk->disk_name); | |
4546 | } | |
4547 | ||
86b00e0d | 4548 | goto out; /* No parent? No problem. */ |
392a9dad | 4549 | } |
86b00e0d | 4550 | |
0903e875 AE |
4551 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4552 | ||
4553 | ret = -EIO; | |
642a2537 | 4554 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4555 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4556 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4557 | goto out_err; |
c0cd10db | 4558 | } |
0903e875 | 4559 | |
979ed480 | 4560 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4561 | if (IS_ERR(image_id)) { |
4562 | ret = PTR_ERR(image_id); | |
4563 | goto out_err; | |
4564 | } | |
3b5cf2a2 | 4565 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4566 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4567 | ||
3b5cf2a2 AE |
4568 | /* |
4569 | * The parent won't change (except when the clone is | |
4570 | * flattened, already handled that). So we only need to | |
4571 | * record the parent spec we have not already done so. | |
4572 | */ | |
4573 | if (!rbd_dev->parent_spec) { | |
4574 | parent_spec->pool_id = pool_id; | |
4575 | parent_spec->image_id = image_id; | |
4576 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4577 | rbd_dev->parent_spec = parent_spec; |
4578 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4579 | } else { |
4580 | kfree(image_id); | |
3b5cf2a2 AE |
4581 | } |
4582 | ||
4583 | /* | |
cf32bd9c ID |
4584 | * We always update the parent overlap. If it's zero we issue |
4585 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4586 | */ |
3b5cf2a2 | 4587 | if (!overlap) { |
3b5cf2a2 | 4588 | if (parent_spec) { |
cf32bd9c ID |
4589 | /* refresh, careful to warn just once */ |
4590 | if (rbd_dev->parent_overlap) | |
4591 | rbd_warn(rbd_dev, | |
4592 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4593 | } else { |
cf32bd9c ID |
4594 | /* initial probe */ |
4595 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4596 | } |
70cf49cf | 4597 | } |
cf32bd9c ID |
4598 | rbd_dev->parent_overlap = overlap; |
4599 | ||
86b00e0d AE |
4600 | out: |
4601 | ret = 0; | |
4602 | out_err: | |
4603 | kfree(reply_buf); | |
4604 | rbd_spec_put(parent_spec); | |
4605 | ||
4606 | return ret; | |
4607 | } | |
4608 | ||
cc070d59 AE |
4609 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4610 | { | |
4611 | struct { | |
4612 | __le64 stripe_unit; | |
4613 | __le64 stripe_count; | |
4614 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4615 | size_t size = sizeof (striping_info_buf); | |
4616 | void *p; | |
cc070d59 AE |
4617 | int ret; |
4618 | ||
ecd4a68a ID |
4619 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4620 | &rbd_dev->header_oloc, "get_stripe_unit_count", | |
4621 | NULL, 0, &striping_info_buf, size); | |
cc070d59 AE |
4622 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4623 | if (ret < 0) | |
4624 | return ret; | |
4625 | if (ret < size) | |
4626 | return -ERANGE; | |
4627 | ||
cc070d59 | 4628 | p = &striping_info_buf; |
b1331852 ID |
4629 | rbd_dev->header.stripe_unit = ceph_decode_64(&p); |
4630 | rbd_dev->header.stripe_count = ceph_decode_64(&p); | |
cc070d59 AE |
4631 | return 0; |
4632 | } | |
4633 | ||
7e97332e ID |
4634 | static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
4635 | { | |
4636 | __le64 data_pool_id; | |
4637 | int ret; | |
4638 | ||
4639 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, | |
4640 | &rbd_dev->header_oloc, "get_data_pool", | |
4641 | NULL, 0, &data_pool_id, sizeof(data_pool_id)); | |
4642 | if (ret < 0) | |
4643 | return ret; | |
4644 | if (ret < sizeof(data_pool_id)) | |
4645 | return -EBADMSG; | |
4646 | ||
4647 | rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); | |
4648 | WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); | |
4649 | return 0; | |
4650 | } | |
4651 | ||
9e15b77d AE |
4652 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4653 | { | |
ecd4a68a | 4654 | CEPH_DEFINE_OID_ONSTACK(oid); |
9e15b77d AE |
4655 | size_t image_id_size; |
4656 | char *image_id; | |
4657 | void *p; | |
4658 | void *end; | |
4659 | size_t size; | |
4660 | void *reply_buf = NULL; | |
4661 | size_t len = 0; | |
4662 | char *image_name = NULL; | |
4663 | int ret; | |
4664 | ||
4665 | rbd_assert(!rbd_dev->spec->image_name); | |
4666 | ||
69e7a02f AE |
4667 | len = strlen(rbd_dev->spec->image_id); |
4668 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4669 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4670 | if (!image_id) | |
4671 | return NULL; | |
4672 | ||
4673 | p = image_id; | |
4157976b | 4674 | end = image_id + image_id_size; |
57385b51 | 4675 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4676 | |
4677 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4678 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4679 | if (!reply_buf) | |
4680 | goto out; | |
4681 | ||
ecd4a68a ID |
4682 | ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
4683 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, | |
4684 | "dir_get_name", image_id, image_id_size, | |
4685 | reply_buf, size); | |
9e15b77d AE |
4686 | if (ret < 0) |
4687 | goto out; | |
4688 | p = reply_buf; | |
f40eb349 AE |
4689 | end = reply_buf + ret; |
4690 | ||
9e15b77d AE |
4691 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4692 | if (IS_ERR(image_name)) | |
4693 | image_name = NULL; | |
4694 | else | |
4695 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4696 | out: | |
4697 | kfree(reply_buf); | |
4698 | kfree(image_id); | |
4699 | ||
4700 | return image_name; | |
4701 | } | |
4702 | ||
2ad3d716 AE |
4703 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4704 | { | |
4705 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4706 | const char *snap_name; | |
4707 | u32 which = 0; | |
4708 | ||
4709 | /* Skip over names until we find the one we are looking for */ | |
4710 | ||
4711 | snap_name = rbd_dev->header.snap_names; | |
4712 | while (which < snapc->num_snaps) { | |
4713 | if (!strcmp(name, snap_name)) | |
4714 | return snapc->snaps[which]; | |
4715 | snap_name += strlen(snap_name) + 1; | |
4716 | which++; | |
4717 | } | |
4718 | return CEPH_NOSNAP; | |
4719 | } | |
4720 | ||
4721 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4722 | { | |
4723 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4724 | u32 which; | |
4725 | bool found = false; | |
4726 | u64 snap_id; | |
4727 | ||
4728 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4729 | const char *snap_name; | |
4730 | ||
4731 | snap_id = snapc->snaps[which]; | |
4732 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4733 | if (IS_ERR(snap_name)) { |
4734 | /* ignore no-longer existing snapshots */ | |
4735 | if (PTR_ERR(snap_name) == -ENOENT) | |
4736 | continue; | |
4737 | else | |
4738 | break; | |
4739 | } | |
2ad3d716 AE |
4740 | found = !strcmp(name, snap_name); |
4741 | kfree(snap_name); | |
4742 | } | |
4743 | return found ? snap_id : CEPH_NOSNAP; | |
4744 | } | |
4745 | ||
4746 | /* | |
4747 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4748 | * no snapshot by that name is found, or if an error occurs. | |
4749 | */ | |
4750 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4751 | { | |
4752 | if (rbd_dev->image_format == 1) | |
4753 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4754 | ||
4755 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4756 | } | |
4757 | ||
9e15b77d | 4758 | /* |
04077599 ID |
4759 | * An image being mapped will have everything but the snap id. |
4760 | */ | |
4761 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4762 | { | |
4763 | struct rbd_spec *spec = rbd_dev->spec; | |
4764 | ||
4765 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4766 | rbd_assert(spec->image_id && spec->image_name); | |
4767 | rbd_assert(spec->snap_name); | |
4768 | ||
4769 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4770 | u64 snap_id; | |
4771 | ||
4772 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4773 | if (snap_id == CEPH_NOSNAP) | |
4774 | return -ENOENT; | |
4775 | ||
4776 | spec->snap_id = snap_id; | |
4777 | } else { | |
4778 | spec->snap_id = CEPH_NOSNAP; | |
4779 | } | |
4780 | ||
4781 | return 0; | |
4782 | } | |
4783 | ||
4784 | /* | |
4785 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4786 | * |
04077599 ID |
4787 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4788 | * can't figure out the name for an image id. | |
9e15b77d | 4789 | */ |
04077599 | 4790 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4791 | { |
2e9f7f1c AE |
4792 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4793 | struct rbd_spec *spec = rbd_dev->spec; | |
4794 | const char *pool_name; | |
4795 | const char *image_name; | |
4796 | const char *snap_name; | |
9e15b77d AE |
4797 | int ret; |
4798 | ||
04077599 ID |
4799 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4800 | rbd_assert(spec->image_id); | |
4801 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4802 | |
2e9f7f1c | 4803 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4804 | |
2e9f7f1c AE |
4805 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4806 | if (!pool_name) { | |
4807 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4808 | return -EIO; |
4809 | } | |
2e9f7f1c AE |
4810 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4811 | if (!pool_name) | |
9e15b77d AE |
4812 | return -ENOMEM; |
4813 | ||
4814 | /* Fetch the image name; tolerate failure here */ | |
4815 | ||
2e9f7f1c AE |
4816 | image_name = rbd_dev_image_name(rbd_dev); |
4817 | if (!image_name) | |
06ecc6cb | 4818 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4819 | |
04077599 | 4820 | /* Fetch the snapshot name */ |
9e15b77d | 4821 | |
2e9f7f1c | 4822 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4823 | if (IS_ERR(snap_name)) { |
4824 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4825 | goto out_err; |
2e9f7f1c AE |
4826 | } |
4827 | ||
4828 | spec->pool_name = pool_name; | |
4829 | spec->image_name = image_name; | |
4830 | spec->snap_name = snap_name; | |
9e15b77d AE |
4831 | |
4832 | return 0; | |
04077599 | 4833 | |
9e15b77d | 4834 | out_err: |
2e9f7f1c AE |
4835 | kfree(image_name); |
4836 | kfree(pool_name); | |
9e15b77d AE |
4837 | return ret; |
4838 | } | |
4839 | ||
cc4a38bd | 4840 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4841 | { |
4842 | size_t size; | |
4843 | int ret; | |
4844 | void *reply_buf; | |
4845 | void *p; | |
4846 | void *end; | |
4847 | u64 seq; | |
4848 | u32 snap_count; | |
4849 | struct ceph_snap_context *snapc; | |
4850 | u32 i; | |
4851 | ||
4852 | /* | |
4853 | * We'll need room for the seq value (maximum snapshot id), | |
4854 | * snapshot count, and array of that many snapshot ids. | |
4855 | * For now we have a fixed upper limit on the number we're | |
4856 | * prepared to receive. | |
4857 | */ | |
4858 | size = sizeof (__le64) + sizeof (__le32) + | |
4859 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4860 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4861 | if (!reply_buf) | |
4862 | return -ENOMEM; | |
4863 | ||
ecd4a68a ID |
4864 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4865 | &rbd_dev->header_oloc, "get_snapcontext", | |
4866 | NULL, 0, reply_buf, size); | |
36be9a76 | 4867 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4868 | if (ret < 0) |
4869 | goto out; | |
4870 | ||
35d489f9 | 4871 | p = reply_buf; |
57385b51 AE |
4872 | end = reply_buf + ret; |
4873 | ret = -ERANGE; | |
35d489f9 AE |
4874 | ceph_decode_64_safe(&p, end, seq, out); |
4875 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4876 | ||
4877 | /* | |
4878 | * Make sure the reported number of snapshot ids wouldn't go | |
4879 | * beyond the end of our buffer. But before checking that, | |
4880 | * make sure the computed size of the snapshot context we | |
4881 | * allocate is representable in a size_t. | |
4882 | */ | |
4883 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4884 | / sizeof (u64)) { | |
4885 | ret = -EINVAL; | |
4886 | goto out; | |
4887 | } | |
4888 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4889 | goto out; | |
468521c1 | 4890 | ret = 0; |
35d489f9 | 4891 | |
812164f8 | 4892 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4893 | if (!snapc) { |
4894 | ret = -ENOMEM; | |
4895 | goto out; | |
4896 | } | |
35d489f9 | 4897 | snapc->seq = seq; |
35d489f9 AE |
4898 | for (i = 0; i < snap_count; i++) |
4899 | snapc->snaps[i] = ceph_decode_64(&p); | |
4900 | ||
49ece554 | 4901 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4902 | rbd_dev->header.snapc = snapc; |
4903 | ||
4904 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4905 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4906 | out: |
4907 | kfree(reply_buf); | |
4908 | ||
57385b51 | 4909 | return ret; |
35d489f9 AE |
4910 | } |
4911 | ||
54cac61f AE |
4912 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4913 | u64 snap_id) | |
b8b1e2db AE |
4914 | { |
4915 | size_t size; | |
4916 | void *reply_buf; | |
54cac61f | 4917 | __le64 snapid; |
b8b1e2db AE |
4918 | int ret; |
4919 | void *p; | |
4920 | void *end; | |
b8b1e2db AE |
4921 | char *snap_name; |
4922 | ||
4923 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4924 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4925 | if (!reply_buf) | |
4926 | return ERR_PTR(-ENOMEM); | |
4927 | ||
54cac61f | 4928 | snapid = cpu_to_le64(snap_id); |
ecd4a68a ID |
4929 | ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
4930 | &rbd_dev->header_oloc, "get_snapshot_name", | |
4931 | &snapid, sizeof(snapid), reply_buf, size); | |
36be9a76 | 4932 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4933 | if (ret < 0) { |
4934 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4935 | goto out; |
f40eb349 | 4936 | } |
b8b1e2db AE |
4937 | |
4938 | p = reply_buf; | |
f40eb349 | 4939 | end = reply_buf + ret; |
e5c35534 | 4940 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4941 | if (IS_ERR(snap_name)) |
b8b1e2db | 4942 | goto out; |
b8b1e2db | 4943 | |
f40eb349 | 4944 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4945 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4946 | out: |
4947 | kfree(reply_buf); | |
4948 | ||
f40eb349 | 4949 | return snap_name; |
b8b1e2db AE |
4950 | } |
4951 | ||
2df3fac7 | 4952 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4953 | { |
2df3fac7 | 4954 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4955 | int ret; |
117973fb | 4956 | |
1617e40c JD |
4957 | ret = rbd_dev_v2_image_size(rbd_dev); |
4958 | if (ret) | |
cfbf6377 | 4959 | return ret; |
1617e40c | 4960 | |
2df3fac7 AE |
4961 | if (first_time) { |
4962 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
4963 | if (ret) | |
cfbf6377 | 4964 | return ret; |
2df3fac7 AE |
4965 | } |
4966 | ||
cc4a38bd | 4967 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
4968 | if (ret && first_time) { |
4969 | kfree(rbd_dev->header.object_prefix); | |
4970 | rbd_dev->header.object_prefix = NULL; | |
4971 | } | |
117973fb AE |
4972 | |
4973 | return ret; | |
4974 | } | |
4975 | ||
a720ae09 ID |
4976 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
4977 | { | |
4978 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4979 | ||
4980 | if (rbd_dev->image_format == 1) | |
4981 | return rbd_dev_v1_header_info(rbd_dev); | |
4982 | ||
4983 | return rbd_dev_v2_header_info(rbd_dev); | |
4984 | } | |
4985 | ||
e28fff26 AE |
4986 | /* |
4987 | * Skips over white space at *buf, and updates *buf to point to the | |
4988 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4989 | * the token (string of non-white space characters) found. Note |
4990 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4991 | */ |
4992 | static inline size_t next_token(const char **buf) | |
4993 | { | |
4994 | /* | |
4995 | * These are the characters that produce nonzero for | |
4996 | * isspace() in the "C" and "POSIX" locales. | |
4997 | */ | |
4998 | const char *spaces = " \f\n\r\t\v"; | |
4999 | ||
5000 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
5001 | ||
5002 | return strcspn(*buf, spaces); /* Return token length */ | |
5003 | } | |
5004 | ||
ea3352f4 AE |
5005 | /* |
5006 | * Finds the next token in *buf, dynamically allocates a buffer big | |
5007 | * enough to hold a copy of it, and copies the token into the new | |
5008 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
5009 | * that a duplicate buffer is created even for a zero-length token. | |
5010 | * | |
5011 | * Returns a pointer to the newly-allocated duplicate, or a null | |
5012 | * pointer if memory for the duplicate was not available. If | |
5013 | * the lenp argument is a non-null pointer, the length of the token | |
5014 | * (not including the '\0') is returned in *lenp. | |
5015 | * | |
5016 | * If successful, the *buf pointer will be updated to point beyond | |
5017 | * the end of the found token. | |
5018 | * | |
5019 | * Note: uses GFP_KERNEL for allocation. | |
5020 | */ | |
5021 | static inline char *dup_token(const char **buf, size_t *lenp) | |
5022 | { | |
5023 | char *dup; | |
5024 | size_t len; | |
5025 | ||
5026 | len = next_token(buf); | |
4caf35f9 | 5027 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
5028 | if (!dup) |
5029 | return NULL; | |
ea3352f4 AE |
5030 | *(dup + len) = '\0'; |
5031 | *buf += len; | |
5032 | ||
5033 | if (lenp) | |
5034 | *lenp = len; | |
5035 | ||
5036 | return dup; | |
5037 | } | |
5038 | ||
a725f65e | 5039 | /* |
859c31df AE |
5040 | * Parse the options provided for an "rbd add" (i.e., rbd image |
5041 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
5042 | * and the data written is passed here via a NUL-terminated buffer. | |
5043 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 5044 | * |
859c31df AE |
5045 | * The information extracted from these options is recorded in |
5046 | * the other parameters which return dynamically-allocated | |
5047 | * structures: | |
5048 | * ceph_opts | |
5049 | * The address of a pointer that will refer to a ceph options | |
5050 | * structure. Caller must release the returned pointer using | |
5051 | * ceph_destroy_options() when it is no longer needed. | |
5052 | * rbd_opts | |
5053 | * Address of an rbd options pointer. Fully initialized by | |
5054 | * this function; caller must release with kfree(). | |
5055 | * spec | |
5056 | * Address of an rbd image specification pointer. Fully | |
5057 | * initialized by this function based on parsed options. | |
5058 | * Caller must release with rbd_spec_put(). | |
5059 | * | |
5060 | * The options passed take this form: | |
5061 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
5062 | * where: | |
5063 | * <mon_addrs> | |
5064 | * A comma-separated list of one or more monitor addresses. | |
5065 | * A monitor address is an ip address, optionally followed | |
5066 | * by a port number (separated by a colon). | |
5067 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
5068 | * <options> | |
5069 | * A comma-separated list of ceph and/or rbd options. | |
5070 | * <pool_name> | |
5071 | * The name of the rados pool containing the rbd image. | |
5072 | * <image_name> | |
5073 | * The name of the image in that pool to map. | |
5074 | * <snap_id> | |
5075 | * An optional snapshot id. If provided, the mapping will | |
5076 | * present data from the image at the time that snapshot was | |
5077 | * created. The image head is used if no snapshot id is | |
5078 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 5079 | */ |
859c31df | 5080 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 5081 | struct ceph_options **ceph_opts, |
859c31df AE |
5082 | struct rbd_options **opts, |
5083 | struct rbd_spec **rbd_spec) | |
e28fff26 | 5084 | { |
d22f76e7 | 5085 | size_t len; |
859c31df | 5086 | char *options; |
0ddebc0c | 5087 | const char *mon_addrs; |
ecb4dc22 | 5088 | char *snap_name; |
0ddebc0c | 5089 | size_t mon_addrs_size; |
859c31df | 5090 | struct rbd_spec *spec = NULL; |
4e9afeba | 5091 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5092 | struct ceph_options *copts; |
dc79b113 | 5093 | int ret; |
e28fff26 AE |
5094 | |
5095 | /* The first four tokens are required */ | |
5096 | ||
7ef3214a | 5097 | len = next_token(&buf); |
4fb5d671 AE |
5098 | if (!len) { |
5099 | rbd_warn(NULL, "no monitor address(es) provided"); | |
5100 | return -EINVAL; | |
5101 | } | |
0ddebc0c | 5102 | mon_addrs = buf; |
f28e565a | 5103 | mon_addrs_size = len + 1; |
7ef3214a | 5104 | buf += len; |
a725f65e | 5105 | |
dc79b113 | 5106 | ret = -EINVAL; |
f28e565a AE |
5107 | options = dup_token(&buf, NULL); |
5108 | if (!options) | |
dc79b113 | 5109 | return -ENOMEM; |
4fb5d671 AE |
5110 | if (!*options) { |
5111 | rbd_warn(NULL, "no options provided"); | |
5112 | goto out_err; | |
5113 | } | |
e28fff26 | 5114 | |
859c31df AE |
5115 | spec = rbd_spec_alloc(); |
5116 | if (!spec) | |
f28e565a | 5117 | goto out_mem; |
859c31df AE |
5118 | |
5119 | spec->pool_name = dup_token(&buf, NULL); | |
5120 | if (!spec->pool_name) | |
5121 | goto out_mem; | |
4fb5d671 AE |
5122 | if (!*spec->pool_name) { |
5123 | rbd_warn(NULL, "no pool name provided"); | |
5124 | goto out_err; | |
5125 | } | |
e28fff26 | 5126 | |
69e7a02f | 5127 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 5128 | if (!spec->image_name) |
f28e565a | 5129 | goto out_mem; |
4fb5d671 AE |
5130 | if (!*spec->image_name) { |
5131 | rbd_warn(NULL, "no image name provided"); | |
5132 | goto out_err; | |
5133 | } | |
d4b125e9 | 5134 | |
f28e565a AE |
5135 | /* |
5136 | * Snapshot name is optional; default is to use "-" | |
5137 | * (indicating the head/no snapshot). | |
5138 | */ | |
3feeb894 | 5139 | len = next_token(&buf); |
820a5f3e | 5140 | if (!len) { |
3feeb894 AE |
5141 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
5142 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 5143 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 5144 | ret = -ENAMETOOLONG; |
f28e565a | 5145 | goto out_err; |
849b4260 | 5146 | } |
ecb4dc22 AE |
5147 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
5148 | if (!snap_name) | |
f28e565a | 5149 | goto out_mem; |
ecb4dc22 AE |
5150 | *(snap_name + len) = '\0'; |
5151 | spec->snap_name = snap_name; | |
e5c35534 | 5152 | |
0ddebc0c | 5153 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 5154 | |
4e9afeba AE |
5155 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
5156 | if (!rbd_opts) | |
5157 | goto out_mem; | |
5158 | ||
5159 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 5160 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
80de1912 | 5161 | rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
e010dd0a | 5162 | rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
d22f76e7 | 5163 | |
859c31df | 5164 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 5165 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 5166 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
5167 | if (IS_ERR(copts)) { |
5168 | ret = PTR_ERR(copts); | |
dc79b113 AE |
5169 | goto out_err; |
5170 | } | |
859c31df AE |
5171 | kfree(options); |
5172 | ||
5173 | *ceph_opts = copts; | |
4e9afeba | 5174 | *opts = rbd_opts; |
859c31df | 5175 | *rbd_spec = spec; |
0ddebc0c | 5176 | |
dc79b113 | 5177 | return 0; |
f28e565a | 5178 | out_mem: |
dc79b113 | 5179 | ret = -ENOMEM; |
d22f76e7 | 5180 | out_err: |
859c31df AE |
5181 | kfree(rbd_opts); |
5182 | rbd_spec_put(spec); | |
f28e565a | 5183 | kfree(options); |
d22f76e7 | 5184 | |
dc79b113 | 5185 | return ret; |
a725f65e AE |
5186 | } |
5187 | ||
30ba1f02 ID |
5188 | /* |
5189 | * Return pool id (>= 0) or a negative error code. | |
5190 | */ | |
5191 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
5192 | { | |
a319bf56 | 5193 | struct ceph_options *opts = rbdc->client->options; |
30ba1f02 | 5194 | u64 newest_epoch; |
30ba1f02 ID |
5195 | int tries = 0; |
5196 | int ret; | |
5197 | ||
5198 | again: | |
5199 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
5200 | if (ret == -ENOENT && tries++ < 1) { | |
d0b19705 ID |
5201 | ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
5202 | &newest_epoch); | |
30ba1f02 ID |
5203 | if (ret < 0) |
5204 | return ret; | |
5205 | ||
5206 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
7cca78c9 | 5207 | ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
30ba1f02 | 5208 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
a319bf56 ID |
5209 | newest_epoch, |
5210 | opts->mount_timeout); | |
30ba1f02 ID |
5211 | goto again; |
5212 | } else { | |
5213 | /* the osdmap we have is new enough */ | |
5214 | return -ENOENT; | |
5215 | } | |
5216 | } | |
5217 | ||
5218 | return ret; | |
5219 | } | |
5220 | ||
e010dd0a ID |
5221 | static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
5222 | { | |
5223 | down_write(&rbd_dev->lock_rwsem); | |
5224 | if (__rbd_is_lock_owner(rbd_dev)) | |
5225 | rbd_unlock(rbd_dev); | |
5226 | up_write(&rbd_dev->lock_rwsem); | |
5227 | } | |
5228 | ||
5229 | static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) | |
5230 | { | |
5231 | if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { | |
5232 | rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); | |
5233 | return -EINVAL; | |
5234 | } | |
5235 | ||
5236 | /* FIXME: "rbd map --exclusive" should be in interruptible */ | |
5237 | down_read(&rbd_dev->lock_rwsem); | |
5238 | rbd_wait_state_locked(rbd_dev); | |
5239 | up_read(&rbd_dev->lock_rwsem); | |
5240 | if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { | |
5241 | rbd_warn(rbd_dev, "failed to acquire exclusive lock"); | |
5242 | return -EROFS; | |
5243 | } | |
5244 | ||
5245 | return 0; | |
5246 | } | |
5247 | ||
589d30e0 AE |
5248 | /* |
5249 | * An rbd format 2 image has a unique identifier, distinct from the | |
5250 | * name given to it by the user. Internally, that identifier is | |
5251 | * what's used to specify the names of objects related to the image. | |
5252 | * | |
5253 | * A special "rbd id" object is used to map an rbd image name to its | |
5254 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5255 | * with the supplied name. | |
5256 | * | |
5257 | * This function will record the given rbd_dev's image_id field if | |
5258 | * it can be determined, and in that case will return 0. If any | |
5259 | * errors occur a negative errno will be returned and the rbd_dev's | |
5260 | * image_id field will be unchanged (and should be NULL). | |
5261 | */ | |
5262 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5263 | { | |
5264 | int ret; | |
5265 | size_t size; | |
ecd4a68a | 5266 | CEPH_DEFINE_OID_ONSTACK(oid); |
589d30e0 | 5267 | void *response; |
c0fba368 | 5268 | char *image_id; |
2f82ee54 | 5269 | |
2c0d0a10 AE |
5270 | /* |
5271 | * When probing a parent image, the image id is already | |
5272 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5273 | * need to fetch the image id again in this case. We |
5274 | * do still need to set the image format though. | |
2c0d0a10 | 5275 | */ |
c0fba368 AE |
5276 | if (rbd_dev->spec->image_id) { |
5277 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5278 | ||
2c0d0a10 | 5279 | return 0; |
c0fba368 | 5280 | } |
2c0d0a10 | 5281 | |
589d30e0 AE |
5282 | /* |
5283 | * First, see if the format 2 image id file exists, and if | |
5284 | * so, get the image's persistent id from it. | |
5285 | */ | |
ecd4a68a ID |
5286 | ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
5287 | rbd_dev->spec->image_name); | |
5288 | if (ret) | |
5289 | return ret; | |
5290 | ||
5291 | dout("rbd id object name is %s\n", oid.name); | |
589d30e0 AE |
5292 | |
5293 | /* Response will be an encoded string, which includes a length */ | |
5294 | ||
5295 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5296 | response = kzalloc(size, GFP_NOIO); | |
5297 | if (!response) { | |
5298 | ret = -ENOMEM; | |
5299 | goto out; | |
5300 | } | |
5301 | ||
c0fba368 AE |
5302 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5303 | ||
ecd4a68a ID |
5304 | ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
5305 | "get_id", NULL, 0, | |
5306 | response, RBD_IMAGE_ID_LEN_MAX); | |
36be9a76 | 5307 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5308 | if (ret == -ENOENT) { |
5309 | image_id = kstrdup("", GFP_KERNEL); | |
5310 | ret = image_id ? 0 : -ENOMEM; | |
5311 | if (!ret) | |
5312 | rbd_dev->image_format = 1; | |
7dd440c9 | 5313 | } else if (ret >= 0) { |
c0fba368 AE |
5314 | void *p = response; |
5315 | ||
5316 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5317 | NULL, GFP_NOIO); |
461f758a | 5318 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5319 | if (!ret) |
5320 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5321 | } |
5322 | ||
5323 | if (!ret) { | |
5324 | rbd_dev->spec->image_id = image_id; | |
5325 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5326 | } |
5327 | out: | |
5328 | kfree(response); | |
ecd4a68a | 5329 | ceph_oid_destroy(&oid); |
589d30e0 AE |
5330 | return ret; |
5331 | } | |
5332 | ||
3abef3b3 AE |
5333 | /* |
5334 | * Undo whatever state changes are made by v1 or v2 header info | |
5335 | * call. | |
5336 | */ | |
6fd48b3b AE |
5337 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5338 | { | |
5339 | struct rbd_image_header *header; | |
5340 | ||
e69b8d41 | 5341 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5342 | |
5343 | /* Free dynamic fields from the header, then zero it out */ | |
5344 | ||
5345 | header = &rbd_dev->header; | |
812164f8 | 5346 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5347 | kfree(header->snap_sizes); |
5348 | kfree(header->snap_names); | |
5349 | kfree(header->object_prefix); | |
5350 | memset(header, 0, sizeof (*header)); | |
5351 | } | |
5352 | ||
2df3fac7 | 5353 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5354 | { |
5355 | int ret; | |
a30b71b9 | 5356 | |
1e130199 | 5357 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5358 | if (ret) |
b1b5402a AE |
5359 | goto out_err; |
5360 | ||
2df3fac7 AE |
5361 | /* |
5362 | * Get the and check features for the image. Currently the | |
5363 | * features are assumed to never change. | |
5364 | */ | |
b1b5402a | 5365 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5366 | if (ret) |
9d475de5 | 5367 | goto out_err; |
35d489f9 | 5368 | |
cc070d59 AE |
5369 | /* If the image supports fancy striping, get its parameters */ |
5370 | ||
5371 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5372 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5373 | if (ret < 0) | |
5374 | goto out_err; | |
5375 | } | |
a30b71b9 | 5376 | |
7e97332e ID |
5377 | if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
5378 | ret = rbd_dev_v2_data_pool(rbd_dev); | |
5379 | if (ret) | |
5380 | goto out_err; | |
5381 | } | |
5382 | ||
263423f8 | 5383 | rbd_init_layout(rbd_dev); |
35152979 | 5384 | return 0; |
263423f8 | 5385 | |
9d475de5 | 5386 | out_err: |
642a2537 | 5387 | rbd_dev->header.features = 0; |
1e130199 AE |
5388 | kfree(rbd_dev->header.object_prefix); |
5389 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 | 5390 | return ret; |
a30b71b9 AE |
5391 | } |
5392 | ||
6d69bb53 ID |
5393 | /* |
5394 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5395 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5396 | * length of the already discovered part of the parent chain. | |
5397 | */ | |
5398 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5399 | { |
2f82ee54 | 5400 | struct rbd_device *parent = NULL; |
124afba2 AE |
5401 | int ret; |
5402 | ||
5403 | if (!rbd_dev->parent_spec) | |
5404 | return 0; | |
124afba2 | 5405 | |
6d69bb53 ID |
5406 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5407 | pr_info("parent chain is too long (%d)\n", depth); | |
5408 | ret = -EINVAL; | |
5409 | goto out_err; | |
5410 | } | |
5411 | ||
1643dfa4 | 5412 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5413 | if (!parent) { |
5414 | ret = -ENOMEM; | |
124afba2 | 5415 | goto out_err; |
1f2c6651 ID |
5416 | } |
5417 | ||
5418 | /* | |
5419 | * Images related by parent/child relationships always share | |
5420 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5421 | */ | |
5422 | __rbd_get_client(rbd_dev->rbd_client); | |
5423 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5424 | |
6d69bb53 | 5425 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5426 | if (ret < 0) |
5427 | goto out_err; | |
1f2c6651 | 5428 | |
124afba2 | 5429 | rbd_dev->parent = parent; |
a2acd00e | 5430 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5431 | return 0; |
1f2c6651 | 5432 | |
124afba2 | 5433 | out_err: |
1f2c6651 | 5434 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5435 | rbd_dev_destroy(parent); |
124afba2 AE |
5436 | return ret; |
5437 | } | |
5438 | ||
5769ed0c ID |
5439 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
5440 | { | |
5441 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
5442 | rbd_dev_mapping_clear(rbd_dev); | |
5443 | rbd_free_disk(rbd_dev); | |
5444 | if (!single_major) | |
5445 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
5446 | } | |
5447 | ||
811c6688 ID |
5448 | /* |
5449 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5450 | * upon return. | |
5451 | */ | |
200a6a8b | 5452 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5453 | { |
83a06263 | 5454 | int ret; |
d1cf5788 | 5455 | |
9b60e70b | 5456 | /* Record our major and minor device numbers. */ |
83a06263 | 5457 | |
9b60e70b ID |
5458 | if (!single_major) { |
5459 | ret = register_blkdev(0, rbd_dev->name); | |
5460 | if (ret < 0) | |
1643dfa4 | 5461 | goto err_out_unlock; |
9b60e70b ID |
5462 | |
5463 | rbd_dev->major = ret; | |
5464 | rbd_dev->minor = 0; | |
5465 | } else { | |
5466 | rbd_dev->major = rbd_major; | |
5467 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5468 | } | |
83a06263 AE |
5469 | |
5470 | /* Set up the blkdev mapping. */ | |
5471 | ||
5472 | ret = rbd_init_disk(rbd_dev); | |
5473 | if (ret) | |
5474 | goto err_out_blkdev; | |
5475 | ||
f35a4dee | 5476 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5477 | if (ret) |
5478 | goto err_out_disk; | |
bc1ecc65 | 5479 | |
f35a4dee | 5480 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
9568c93e | 5481 | set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only); |
f35a4dee | 5482 | |
5769ed0c | 5483 | ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
f35a4dee | 5484 | if (ret) |
f5ee37bd | 5485 | goto err_out_mapping; |
83a06263 | 5486 | |
129b79d4 | 5487 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5488 | up_write(&rbd_dev->header_rwsem); |
5769ed0c | 5489 | return 0; |
2f82ee54 | 5490 | |
f35a4dee AE |
5491 | err_out_mapping: |
5492 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5493 | err_out_disk: |
5494 | rbd_free_disk(rbd_dev); | |
5495 | err_out_blkdev: | |
9b60e70b ID |
5496 | if (!single_major) |
5497 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5498 | err_out_unlock: |
5499 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5500 | return ret; |
5501 | } | |
5502 | ||
332bb12d AE |
5503 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5504 | { | |
5505 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5506 | int ret; |
332bb12d AE |
5507 | |
5508 | /* Record the header object name for this rbd image. */ | |
5509 | ||
5510 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
332bb12d | 5511 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5512 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5513 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5514 | else |
c41d13a3 ID |
5515 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5516 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5517 | |
c41d13a3 | 5518 | return ret; |
332bb12d AE |
5519 | } |
5520 | ||
200a6a8b AE |
5521 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5522 | { | |
6fd48b3b | 5523 | rbd_dev_unprobe(rbd_dev); |
fd22aef8 ID |
5524 | if (rbd_dev->opts) |
5525 | rbd_unregister_watch(rbd_dev); | |
6fd48b3b AE |
5526 | rbd_dev->image_format = 0; |
5527 | kfree(rbd_dev->spec->image_id); | |
5528 | rbd_dev->spec->image_id = NULL; | |
200a6a8b AE |
5529 | } |
5530 | ||
a30b71b9 AE |
5531 | /* |
5532 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5533 | * device. If this image is the one being mapped (i.e., not a |
5534 | * parent), initiate a watch on its header object before using that | |
5535 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5536 | */ |
6d69bb53 | 5537 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5538 | { |
5539 | int ret; | |
5540 | ||
5541 | /* | |
3abef3b3 AE |
5542 | * Get the id from the image id object. Unless there's an |
5543 | * error, rbd_dev->spec->image_id will be filled in with | |
5544 | * a dynamically-allocated string, and rbd_dev->image_format | |
5545 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5546 | */ |
5547 | ret = rbd_dev_image_id(rbd_dev); | |
5548 | if (ret) | |
c0fba368 | 5549 | return ret; |
c0fba368 | 5550 | |
332bb12d AE |
5551 | ret = rbd_dev_header_name(rbd_dev); |
5552 | if (ret) | |
5553 | goto err_out_format; | |
5554 | ||
6d69bb53 | 5555 | if (!depth) { |
99d16943 | 5556 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5557 | if (ret) { |
5558 | if (ret == -ENOENT) | |
5559 | pr_info("image %s/%s does not exist\n", | |
5560 | rbd_dev->spec->pool_name, | |
5561 | rbd_dev->spec->image_name); | |
c41d13a3 | 5562 | goto err_out_format; |
1fe48023 | 5563 | } |
1f3ef788 | 5564 | } |
b644de2b | 5565 | |
a720ae09 | 5566 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5567 | if (ret) |
b644de2b | 5568 | goto err_out_watch; |
83a06263 | 5569 | |
04077599 ID |
5570 | /* |
5571 | * If this image is the one being mapped, we have pool name and | |
5572 | * id, image name and id, and snap name - need to fill snap id. | |
5573 | * Otherwise this is a parent image, identified by pool, image | |
5574 | * and snap ids - need to fill in names for those ids. | |
5575 | */ | |
6d69bb53 | 5576 | if (!depth) |
04077599 ID |
5577 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5578 | else | |
5579 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5580 | if (ret) { |
5581 | if (ret == -ENOENT) | |
5582 | pr_info("snap %s/%s@%s does not exist\n", | |
5583 | rbd_dev->spec->pool_name, | |
5584 | rbd_dev->spec->image_name, | |
5585 | rbd_dev->spec->snap_name); | |
33dca39f | 5586 | goto err_out_probe; |
1fe48023 | 5587 | } |
9bb81c9b | 5588 | |
e8f59b59 ID |
5589 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5590 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5591 | if (ret) | |
5592 | goto err_out_probe; | |
5593 | ||
5594 | /* | |
5595 | * Need to warn users if this image is the one being | |
5596 | * mapped and has a parent. | |
5597 | */ | |
6d69bb53 | 5598 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
5599 | rbd_warn(rbd_dev, |
5600 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5601 | } | |
5602 | ||
6d69bb53 | 5603 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5604 | if (ret) |
5605 | goto err_out_probe; | |
5606 | ||
5607 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5608 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5609 | return 0; |
e8f59b59 | 5610 | |
6fd48b3b AE |
5611 | err_out_probe: |
5612 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5613 | err_out_watch: |
6d69bb53 | 5614 | if (!depth) |
99d16943 | 5615 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5616 | err_out_format: |
5617 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5618 | kfree(rbd_dev->spec->image_id); |
5619 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5620 | return ret; |
5621 | } | |
5622 | ||
9b60e70b ID |
5623 | static ssize_t do_rbd_add(struct bus_type *bus, |
5624 | const char *buf, | |
5625 | size_t count) | |
602adf40 | 5626 | { |
cb8627c7 | 5627 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5628 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5629 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5630 | struct rbd_spec *spec = NULL; |
9d3997fd | 5631 | struct rbd_client *rbdc; |
b51c83c2 | 5632 | int rc; |
602adf40 YS |
5633 | |
5634 | if (!try_module_get(THIS_MODULE)) | |
5635 | return -ENODEV; | |
5636 | ||
602adf40 | 5637 | /* parse add command */ |
859c31df | 5638 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5639 | if (rc < 0) |
dd5ac32d | 5640 | goto out; |
78cea76e | 5641 | |
9d3997fd AE |
5642 | rbdc = rbd_get_client(ceph_opts); |
5643 | if (IS_ERR(rbdc)) { | |
5644 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5645 | goto err_out_args; |
9d3997fd | 5646 | } |
602adf40 | 5647 | |
602adf40 | 5648 | /* pick the pool */ |
30ba1f02 | 5649 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
1fe48023 ID |
5650 | if (rc < 0) { |
5651 | if (rc == -ENOENT) | |
5652 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5653 | goto err_out_client; |
1fe48023 | 5654 | } |
c0cd10db | 5655 | spec->pool_id = (u64)rc; |
859c31df | 5656 | |
d147543d | 5657 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5658 | if (!rbd_dev) { |
5659 | rc = -ENOMEM; | |
bd4ba655 | 5660 | goto err_out_client; |
b51c83c2 | 5661 | } |
c53d5893 AE |
5662 | rbdc = NULL; /* rbd_dev now owns this */ |
5663 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5664 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5665 | |
0d6d1e9c MC |
5666 | rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
5667 | if (!rbd_dev->config_info) { | |
5668 | rc = -ENOMEM; | |
5669 | goto err_out_rbd_dev; | |
5670 | } | |
5671 | ||
811c6688 | 5672 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5673 | rc = rbd_dev_image_probe(rbd_dev, 0); |
0d6d1e9c MC |
5674 | if (rc < 0) { |
5675 | up_write(&rbd_dev->header_rwsem); | |
c53d5893 | 5676 | goto err_out_rbd_dev; |
0d6d1e9c | 5677 | } |
05fd6f6f | 5678 | |
7ce4eef7 | 5679 | /* If we are mapping a snapshot it must be marked read-only */ |
7ce4eef7 | 5680 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9568c93e | 5681 | rbd_dev->opts->read_only = true; |
7ce4eef7 | 5682 | |
b536f69a | 5683 | rc = rbd_dev_device_setup(rbd_dev); |
fd22aef8 | 5684 | if (rc) |
8b679ec5 | 5685 | goto err_out_image_probe; |
3abef3b3 | 5686 | |
e010dd0a ID |
5687 | if (rbd_dev->opts->exclusive) { |
5688 | rc = rbd_add_acquire_lock(rbd_dev); | |
5689 | if (rc) | |
5690 | goto err_out_device_setup; | |
3abef3b3 AE |
5691 | } |
5692 | ||
5769ed0c ID |
5693 | /* Everything's ready. Announce the disk to the world. */ |
5694 | ||
5695 | rc = device_add(&rbd_dev->dev); | |
5696 | if (rc) | |
e010dd0a | 5697 | goto err_out_image_lock; |
5769ed0c ID |
5698 | |
5699 | add_disk(rbd_dev->disk); | |
5700 | /* see rbd_init_disk() */ | |
5701 | blk_put_queue(rbd_dev->disk->queue); | |
5702 | ||
5703 | spin_lock(&rbd_dev_list_lock); | |
5704 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5705 | spin_unlock(&rbd_dev_list_lock); | |
5706 | ||
5707 | pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, | |
5708 | (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, | |
5709 | rbd_dev->header.features); | |
dd5ac32d ID |
5710 | rc = count; |
5711 | out: | |
5712 | module_put(THIS_MODULE); | |
5713 | return rc; | |
b536f69a | 5714 | |
e010dd0a ID |
5715 | err_out_image_lock: |
5716 | rbd_dev_image_unlock(rbd_dev); | |
5769ed0c ID |
5717 | err_out_device_setup: |
5718 | rbd_dev_device_release(rbd_dev); | |
8b679ec5 ID |
5719 | err_out_image_probe: |
5720 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
5721 | err_out_rbd_dev: |
5722 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5723 | err_out_client: |
9d3997fd | 5724 | rbd_put_client(rbdc); |
0ddebc0c | 5725 | err_out_args: |
859c31df | 5726 | rbd_spec_put(spec); |
d147543d | 5727 | kfree(rbd_opts); |
dd5ac32d | 5728 | goto out; |
602adf40 YS |
5729 | } |
5730 | ||
9b60e70b ID |
5731 | static ssize_t rbd_add(struct bus_type *bus, |
5732 | const char *buf, | |
5733 | size_t count) | |
5734 | { | |
5735 | if (single_major) | |
5736 | return -EINVAL; | |
5737 | ||
5738 | return do_rbd_add(bus, buf, count); | |
5739 | } | |
5740 | ||
5741 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5742 | const char *buf, | |
5743 | size_t count) | |
5744 | { | |
5745 | return do_rbd_add(bus, buf, count); | |
5746 | } | |
5747 | ||
05a46afd AE |
5748 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5749 | { | |
ad945fc1 | 5750 | while (rbd_dev->parent) { |
05a46afd AE |
5751 | struct rbd_device *first = rbd_dev; |
5752 | struct rbd_device *second = first->parent; | |
5753 | struct rbd_device *third; | |
5754 | ||
5755 | /* | |
5756 | * Follow to the parent with no grandparent and | |
5757 | * remove it. | |
5758 | */ | |
5759 | while (second && (third = second->parent)) { | |
5760 | first = second; | |
5761 | second = third; | |
5762 | } | |
ad945fc1 | 5763 | rbd_assert(second); |
8ad42cd0 | 5764 | rbd_dev_image_release(second); |
8b679ec5 | 5765 | rbd_dev_destroy(second); |
ad945fc1 AE |
5766 | first->parent = NULL; |
5767 | first->parent_overlap = 0; | |
5768 | ||
5769 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5770 | rbd_spec_put(first->parent_spec); |
5771 | first->parent_spec = NULL; | |
05a46afd AE |
5772 | } |
5773 | } | |
5774 | ||
9b60e70b ID |
5775 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5776 | const char *buf, | |
5777 | size_t count) | |
602adf40 YS |
5778 | { |
5779 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5780 | struct list_head *tmp; |
5781 | int dev_id; | |
0276dca6 | 5782 | char opt_buf[6]; |
82a442d2 | 5783 | bool already = false; |
0276dca6 | 5784 | bool force = false; |
0d8189e1 | 5785 | int ret; |
602adf40 | 5786 | |
0276dca6 MC |
5787 | dev_id = -1; |
5788 | opt_buf[0] = '\0'; | |
5789 | sscanf(buf, "%d %5s", &dev_id, opt_buf); | |
5790 | if (dev_id < 0) { | |
5791 | pr_err("dev_id out of range\n"); | |
602adf40 | 5792 | return -EINVAL; |
0276dca6 MC |
5793 | } |
5794 | if (opt_buf[0] != '\0') { | |
5795 | if (!strcmp(opt_buf, "force")) { | |
5796 | force = true; | |
5797 | } else { | |
5798 | pr_err("bad remove option at '%s'\n", opt_buf); | |
5799 | return -EINVAL; | |
5800 | } | |
5801 | } | |
602adf40 | 5802 | |
751cc0e3 AE |
5803 | ret = -ENOENT; |
5804 | spin_lock(&rbd_dev_list_lock); | |
5805 | list_for_each(tmp, &rbd_dev_list) { | |
5806 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5807 | if (rbd_dev->dev_id == dev_id) { | |
5808 | ret = 0; | |
5809 | break; | |
5810 | } | |
42382b70 | 5811 | } |
751cc0e3 AE |
5812 | if (!ret) { |
5813 | spin_lock_irq(&rbd_dev->lock); | |
0276dca6 | 5814 | if (rbd_dev->open_count && !force) |
751cc0e3 AE |
5815 | ret = -EBUSY; |
5816 | else | |
82a442d2 AE |
5817 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5818 | &rbd_dev->flags); | |
751cc0e3 AE |
5819 | spin_unlock_irq(&rbd_dev->lock); |
5820 | } | |
5821 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5822 | if (ret < 0 || already) |
1ba0f1e7 | 5823 | return ret; |
751cc0e3 | 5824 | |
0276dca6 MC |
5825 | if (force) { |
5826 | /* | |
5827 | * Prevent new IO from being queued and wait for existing | |
5828 | * IO to complete/fail. | |
5829 | */ | |
5830 | blk_mq_freeze_queue(rbd_dev->disk->queue); | |
5831 | blk_set_queue_dying(rbd_dev->disk->queue); | |
5832 | } | |
5833 | ||
5769ed0c ID |
5834 | del_gendisk(rbd_dev->disk); |
5835 | spin_lock(&rbd_dev_list_lock); | |
5836 | list_del_init(&rbd_dev->node); | |
5837 | spin_unlock(&rbd_dev_list_lock); | |
5838 | device_del(&rbd_dev->dev); | |
fca27065 | 5839 | |
e010dd0a | 5840 | rbd_dev_image_unlock(rbd_dev); |
dd5ac32d | 5841 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 5842 | rbd_dev_image_release(rbd_dev); |
8b679ec5 | 5843 | rbd_dev_destroy(rbd_dev); |
1ba0f1e7 | 5844 | return count; |
602adf40 YS |
5845 | } |
5846 | ||
9b60e70b ID |
5847 | static ssize_t rbd_remove(struct bus_type *bus, |
5848 | const char *buf, | |
5849 | size_t count) | |
5850 | { | |
5851 | if (single_major) | |
5852 | return -EINVAL; | |
5853 | ||
5854 | return do_rbd_remove(bus, buf, count); | |
5855 | } | |
5856 | ||
5857 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5858 | const char *buf, | |
5859 | size_t count) | |
5860 | { | |
5861 | return do_rbd_remove(bus, buf, count); | |
5862 | } | |
5863 | ||
602adf40 YS |
5864 | /* |
5865 | * create control files in sysfs | |
dfc5606d | 5866 | * /sys/bus/rbd/... |
602adf40 YS |
5867 | */ |
5868 | static int rbd_sysfs_init(void) | |
5869 | { | |
dfc5606d | 5870 | int ret; |
602adf40 | 5871 | |
fed4c143 | 5872 | ret = device_register(&rbd_root_dev); |
21079786 | 5873 | if (ret < 0) |
dfc5606d | 5874 | return ret; |
602adf40 | 5875 | |
fed4c143 AE |
5876 | ret = bus_register(&rbd_bus_type); |
5877 | if (ret < 0) | |
5878 | device_unregister(&rbd_root_dev); | |
602adf40 | 5879 | |
602adf40 YS |
5880 | return ret; |
5881 | } | |
5882 | ||
5883 | static void rbd_sysfs_cleanup(void) | |
5884 | { | |
dfc5606d | 5885 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5886 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5887 | } |
5888 | ||
1c2a9dfe AE |
5889 | static int rbd_slab_init(void) |
5890 | { | |
5891 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 5892 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
5893 | if (!rbd_img_request_cache) |
5894 | return -ENOMEM; | |
5895 | ||
5896 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 5897 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
5898 | if (!rbd_obj_request_cache) |
5899 | goto out_err; | |
5900 | ||
6c696d85 | 5901 | return 0; |
1c2a9dfe | 5902 | |
6c696d85 | 5903 | out_err: |
868311b1 AE |
5904 | kmem_cache_destroy(rbd_img_request_cache); |
5905 | rbd_img_request_cache = NULL; | |
1c2a9dfe AE |
5906 | return -ENOMEM; |
5907 | } | |
5908 | ||
5909 | static void rbd_slab_exit(void) | |
5910 | { | |
868311b1 AE |
5911 | rbd_assert(rbd_obj_request_cache); |
5912 | kmem_cache_destroy(rbd_obj_request_cache); | |
5913 | rbd_obj_request_cache = NULL; | |
5914 | ||
1c2a9dfe AE |
5915 | rbd_assert(rbd_img_request_cache); |
5916 | kmem_cache_destroy(rbd_img_request_cache); | |
5917 | rbd_img_request_cache = NULL; | |
5918 | } | |
5919 | ||
cc344fa1 | 5920 | static int __init rbd_init(void) |
602adf40 YS |
5921 | { |
5922 | int rc; | |
5923 | ||
1e32d34c AE |
5924 | if (!libceph_compatible(NULL)) { |
5925 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5926 | return -EINVAL; |
5927 | } | |
e1b4d96d | 5928 | |
1c2a9dfe | 5929 | rc = rbd_slab_init(); |
602adf40 YS |
5930 | if (rc) |
5931 | return rc; | |
e1b4d96d | 5932 | |
f5ee37bd ID |
5933 | /* |
5934 | * The number of active work items is limited by the number of | |
f77303bd | 5935 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
5936 | */ |
5937 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
5938 | if (!rbd_wq) { | |
5939 | rc = -ENOMEM; | |
5940 | goto err_out_slab; | |
5941 | } | |
5942 | ||
9b60e70b ID |
5943 | if (single_major) { |
5944 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5945 | if (rbd_major < 0) { | |
5946 | rc = rbd_major; | |
f5ee37bd | 5947 | goto err_out_wq; |
9b60e70b ID |
5948 | } |
5949 | } | |
5950 | ||
1c2a9dfe AE |
5951 | rc = rbd_sysfs_init(); |
5952 | if (rc) | |
9b60e70b ID |
5953 | goto err_out_blkdev; |
5954 | ||
5955 | if (single_major) | |
5956 | pr_info("loaded (major %d)\n", rbd_major); | |
5957 | else | |
5958 | pr_info("loaded\n"); | |
1c2a9dfe | 5959 | |
e1b4d96d ID |
5960 | return 0; |
5961 | ||
9b60e70b ID |
5962 | err_out_blkdev: |
5963 | if (single_major) | |
5964 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
5965 | err_out_wq: |
5966 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
5967 | err_out_slab: |
5968 | rbd_slab_exit(); | |
1c2a9dfe | 5969 | return rc; |
602adf40 YS |
5970 | } |
5971 | ||
cc344fa1 | 5972 | static void __exit rbd_exit(void) |
602adf40 | 5973 | { |
ffe312cf | 5974 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 5975 | rbd_sysfs_cleanup(); |
9b60e70b ID |
5976 | if (single_major) |
5977 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 5978 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 5979 | rbd_slab_exit(); |
602adf40 YS |
5980 | } |
5981 | ||
5982 | module_init(rbd_init); | |
5983 | module_exit(rbd_exit); | |
5984 | ||
d552c619 | 5985 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
5986 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
5987 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
5988 | /* following authorship retained from original osdblk.c */ |
5989 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5990 | ||
90da258b | 5991 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 5992 | MODULE_LICENSE("GPL"); |