Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
df111be6 AE |
55 | /* It might be useful to have this defined elsewhere too */ |
56 | ||
57 | #define U64_MAX ((u64) (~0ULL)) | |
58 | ||
f0f8cef5 AE |
59 | #define RBD_DRV_NAME "rbd" |
60 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
61 | |
62 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
63 | ||
d4b125e9 AE |
64 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
65 | #define RBD_MAX_SNAP_NAME_LEN \ | |
66 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
67 | ||
35d489f9 | 68 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
69 | #define RBD_MAX_OPT_LEN 1024 |
70 | ||
71 | #define RBD_SNAP_HEAD_NAME "-" | |
72 | ||
1e130199 AE |
73 | #define RBD_IMAGE_ID_LEN_MAX 64 |
74 | #define RBD_OBJ_PREFIX_LEN_MAX 64 | |
589d30e0 | 75 | |
d889140c AE |
76 | /* Feature bits */ |
77 | ||
78 | #define RBD_FEATURE_LAYERING 1 | |
79 | ||
80 | /* Features supported by this (client software) implementation. */ | |
81 | ||
82 | #define RBD_FEATURES_ALL (0) | |
83 | ||
81a89793 AE |
84 | /* |
85 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
86 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
87 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
88 | * enough to hold all possible device names. | |
89 | */ | |
602adf40 | 90 | #define DEV_NAME_LEN 32 |
81a89793 | 91 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 92 | |
cc0538b6 | 93 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 94 | |
602adf40 YS |
95 | /* |
96 | * block device image metadata (in-memory version) | |
97 | */ | |
98 | struct rbd_image_header { | |
f84344f3 | 99 | /* These four fields never change for a given rbd image */ |
849b4260 | 100 | char *object_prefix; |
34b13184 | 101 | u64 features; |
602adf40 YS |
102 | __u8 obj_order; |
103 | __u8 crypt_type; | |
104 | __u8 comp_type; | |
602adf40 | 105 | |
f84344f3 AE |
106 | /* The remaining fields need to be updated occasionally */ |
107 | u64 image_size; | |
108 | struct ceph_snap_context *snapc; | |
602adf40 YS |
109 | char *snap_names; |
110 | u64 *snap_sizes; | |
59c2be1e YS |
111 | |
112 | u64 obj_version; | |
113 | }; | |
114 | ||
115 | struct rbd_options { | |
cc0538b6 | 116 | bool read_only; |
602adf40 YS |
117 | }; |
118 | ||
119 | /* | |
f0f8cef5 | 120 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
121 | */ |
122 | struct rbd_client { | |
123 | struct ceph_client *client; | |
124 | struct kref kref; | |
125 | struct list_head node; | |
126 | }; | |
127 | ||
128 | /* | |
f0f8cef5 | 129 | * a request completion status |
602adf40 | 130 | */ |
1fec7093 YS |
131 | struct rbd_req_status { |
132 | int done; | |
133 | int rc; | |
134 | u64 bytes; | |
135 | }; | |
136 | ||
137 | /* | |
138 | * a collection of requests | |
139 | */ | |
140 | struct rbd_req_coll { | |
141 | int total; | |
142 | int num_done; | |
143 | struct kref kref; | |
144 | struct rbd_req_status status[0]; | |
602adf40 YS |
145 | }; |
146 | ||
f0f8cef5 AE |
147 | /* |
148 | * a single io request | |
149 | */ | |
150 | struct rbd_request { | |
151 | struct request *rq; /* blk layer request */ | |
152 | struct bio *bio; /* cloned bio */ | |
153 | struct page **pages; /* list of used pages */ | |
154 | u64 len; | |
155 | int coll_index; | |
156 | struct rbd_req_coll *coll; | |
157 | }; | |
158 | ||
dfc5606d YS |
159 | struct rbd_snap { |
160 | struct device dev; | |
161 | const char *name; | |
3591538f | 162 | u64 size; |
dfc5606d YS |
163 | struct list_head node; |
164 | u64 id; | |
34b13184 | 165 | u64 features; |
dfc5606d YS |
166 | }; |
167 | ||
f84344f3 | 168 | struct rbd_mapping { |
99c1f08f | 169 | u64 size; |
34b13184 | 170 | u64 features; |
f84344f3 AE |
171 | bool read_only; |
172 | }; | |
173 | ||
602adf40 YS |
174 | /* |
175 | * a single device | |
176 | */ | |
177 | struct rbd_device { | |
de71a297 | 178 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
179 | |
180 | int major; /* blkdev assigned major */ | |
181 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 182 | |
a30b71b9 | 183 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
184 | struct rbd_client *rbd_client; |
185 | ||
186 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
187 | ||
188 | spinlock_t lock; /* queue lock */ | |
189 | ||
190 | struct rbd_image_header header; | |
daba5fdb | 191 | bool exists; |
589d30e0 AE |
192 | char *image_id; |
193 | size_t image_id_len; | |
0bed54dc AE |
194 | char *image_name; |
195 | size_t image_name_len; | |
196 | char *header_name; | |
d22f76e7 | 197 | char *pool_name; |
86992098 | 198 | u64 pool_id; |
602adf40 | 199 | |
971f839a AE |
200 | char *snap_name; |
201 | u64 snap_id; | |
202 | ||
59c2be1e YS |
203 | struct ceph_osd_event *watch_event; |
204 | struct ceph_osd_request *watch_request; | |
205 | ||
c666601a JD |
206 | /* protects updating the header */ |
207 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
208 | |
209 | struct rbd_mapping mapping; | |
602adf40 YS |
210 | |
211 | struct list_head node; | |
dfc5606d YS |
212 | |
213 | /* list of snapshots */ | |
214 | struct list_head snaps; | |
215 | ||
216 | /* sysfs related */ | |
217 | struct device dev; | |
218 | }; | |
219 | ||
602adf40 | 220 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 221 | |
602adf40 | 222 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
223 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
224 | ||
432b8587 AE |
225 | static LIST_HEAD(rbd_client_list); /* clients */ |
226 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 227 | |
304f6808 AE |
228 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
229 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); | |
230 | ||
dfc5606d | 231 | static void rbd_dev_release(struct device *dev); |
41f38c2b | 232 | static void rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 233 | |
f0f8cef5 AE |
234 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
235 | size_t count); | |
236 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
237 | size_t count); | |
238 | ||
239 | static struct bus_attribute rbd_bus_attrs[] = { | |
240 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
241 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
242 | __ATTR_NULL | |
243 | }; | |
244 | ||
245 | static struct bus_type rbd_bus_type = { | |
246 | .name = "rbd", | |
247 | .bus_attrs = rbd_bus_attrs, | |
248 | }; | |
249 | ||
250 | static void rbd_root_dev_release(struct device *dev) | |
251 | { | |
252 | } | |
253 | ||
254 | static struct device rbd_root_dev = { | |
255 | .init_name = "rbd", | |
256 | .release = rbd_root_dev_release, | |
257 | }; | |
258 | ||
aafb230e AE |
259 | #ifdef RBD_DEBUG |
260 | #define rbd_assert(expr) \ | |
261 | if (unlikely(!(expr))) { \ | |
262 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
263 | "at line %d:\n\n" \ | |
264 | "\trbd_assert(%s);\n\n", \ | |
265 | __func__, __LINE__, #expr); \ | |
266 | BUG(); \ | |
267 | } | |
268 | #else /* !RBD_DEBUG */ | |
269 | # define rbd_assert(expr) ((void) 0) | |
270 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 271 | |
dfc5606d YS |
272 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
273 | { | |
274 | return get_device(&rbd_dev->dev); | |
275 | } | |
276 | ||
277 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
278 | { | |
279 | put_device(&rbd_dev->dev); | |
280 | } | |
602adf40 | 281 | |
117973fb AE |
282 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
283 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); | |
59c2be1e | 284 | |
602adf40 YS |
285 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
286 | { | |
f0f8cef5 | 287 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 288 | |
f84344f3 | 289 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
290 | return -EROFS; |
291 | ||
340c7a2b | 292 | rbd_get_dev(rbd_dev); |
f84344f3 | 293 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
340c7a2b | 294 | |
602adf40 YS |
295 | return 0; |
296 | } | |
297 | ||
dfc5606d YS |
298 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
299 | { | |
300 | struct rbd_device *rbd_dev = disk->private_data; | |
301 | ||
302 | rbd_put_dev(rbd_dev); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
602adf40 YS |
307 | static const struct block_device_operations rbd_bd_ops = { |
308 | .owner = THIS_MODULE, | |
309 | .open = rbd_open, | |
dfc5606d | 310 | .release = rbd_release, |
602adf40 YS |
311 | }; |
312 | ||
313 | /* | |
314 | * Initialize an rbd client instance. | |
43ae4701 | 315 | * We own *ceph_opts. |
602adf40 | 316 | */ |
f8c38929 | 317 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
318 | { |
319 | struct rbd_client *rbdc; | |
320 | int ret = -ENOMEM; | |
321 | ||
322 | dout("rbd_client_create\n"); | |
323 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
324 | if (!rbdc) | |
325 | goto out_opt; | |
326 | ||
327 | kref_init(&rbdc->kref); | |
328 | INIT_LIST_HEAD(&rbdc->node); | |
329 | ||
bc534d86 AE |
330 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
331 | ||
43ae4701 | 332 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 333 | if (IS_ERR(rbdc->client)) |
bc534d86 | 334 | goto out_mutex; |
43ae4701 | 335 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
336 | |
337 | ret = ceph_open_session(rbdc->client); | |
338 | if (ret < 0) | |
339 | goto out_err; | |
340 | ||
432b8587 | 341 | spin_lock(&rbd_client_list_lock); |
602adf40 | 342 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 343 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 344 | |
bc534d86 AE |
345 | mutex_unlock(&ctl_mutex); |
346 | ||
602adf40 YS |
347 | dout("rbd_client_create created %p\n", rbdc); |
348 | return rbdc; | |
349 | ||
350 | out_err: | |
351 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
352 | out_mutex: |
353 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
354 | kfree(rbdc); |
355 | out_opt: | |
43ae4701 AE |
356 | if (ceph_opts) |
357 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 358 | return ERR_PTR(ret); |
602adf40 YS |
359 | } |
360 | ||
361 | /* | |
1f7ba331 AE |
362 | * Find a ceph client with specific addr and configuration. If |
363 | * found, bump its reference count. | |
602adf40 | 364 | */ |
1f7ba331 | 365 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
366 | { |
367 | struct rbd_client *client_node; | |
1f7ba331 | 368 | bool found = false; |
602adf40 | 369 | |
43ae4701 | 370 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
371 | return NULL; |
372 | ||
1f7ba331 AE |
373 | spin_lock(&rbd_client_list_lock); |
374 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
375 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
376 | kref_get(&client_node->kref); | |
377 | found = true; | |
378 | break; | |
379 | } | |
380 | } | |
381 | spin_unlock(&rbd_client_list_lock); | |
382 | ||
383 | return found ? client_node : NULL; | |
602adf40 YS |
384 | } |
385 | ||
59c2be1e YS |
386 | /* |
387 | * mount options | |
388 | */ | |
389 | enum { | |
59c2be1e YS |
390 | Opt_last_int, |
391 | /* int args above */ | |
392 | Opt_last_string, | |
393 | /* string args above */ | |
cc0538b6 AE |
394 | Opt_read_only, |
395 | Opt_read_write, | |
396 | /* Boolean args above */ | |
397 | Opt_last_bool, | |
59c2be1e YS |
398 | }; |
399 | ||
43ae4701 | 400 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
401 | /* int args above */ |
402 | /* string args above */ | |
be466c1c | 403 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
404 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
405 | {Opt_read_write, "read_write"}, | |
406 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
407 | /* Boolean args above */ | |
59c2be1e YS |
408 | {-1, NULL} |
409 | }; | |
410 | ||
411 | static int parse_rbd_opts_token(char *c, void *private) | |
412 | { | |
43ae4701 | 413 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
414 | substring_t argstr[MAX_OPT_ARGS]; |
415 | int token, intval, ret; | |
416 | ||
43ae4701 | 417 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
418 | if (token < 0) |
419 | return -EINVAL; | |
420 | ||
421 | if (token < Opt_last_int) { | |
422 | ret = match_int(&argstr[0], &intval); | |
423 | if (ret < 0) { | |
424 | pr_err("bad mount option arg (not int) " | |
425 | "at '%s'\n", c); | |
426 | return ret; | |
427 | } | |
428 | dout("got int token %d val %d\n", token, intval); | |
429 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
430 | dout("got string token %d val %s\n", token, | |
431 | argstr[0].from); | |
cc0538b6 AE |
432 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
433 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
434 | } else { |
435 | dout("got token %d\n", token); | |
436 | } | |
437 | ||
438 | switch (token) { | |
cc0538b6 AE |
439 | case Opt_read_only: |
440 | rbd_opts->read_only = true; | |
441 | break; | |
442 | case Opt_read_write: | |
443 | rbd_opts->read_only = false; | |
444 | break; | |
59c2be1e | 445 | default: |
aafb230e AE |
446 | rbd_assert(false); |
447 | break; | |
59c2be1e YS |
448 | } |
449 | return 0; | |
450 | } | |
451 | ||
602adf40 YS |
452 | /* |
453 | * Get a ceph client with specific addr and configuration, if one does | |
454 | * not exist create it. | |
455 | */ | |
f8c38929 AE |
456 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
457 | size_t mon_addr_len, char *options) | |
602adf40 | 458 | { |
069a4b56 | 459 | struct rbd_options rbd_opts; |
43ae4701 | 460 | struct ceph_options *ceph_opts; |
f8c38929 | 461 | struct rbd_client *rbdc; |
59c2be1e | 462 | |
069a4b56 AE |
463 | /* Initialize all rbd options to the defaults */ |
464 | ||
465 | rbd_opts.read_only = RBD_READ_ONLY_DEFAULT; | |
602adf40 | 466 | |
43ae4701 AE |
467 | ceph_opts = ceph_parse_options(options, mon_addr, |
468 | mon_addr + mon_addr_len, | |
069a4b56 | 469 | parse_rbd_opts_token, &rbd_opts); |
f8c38929 AE |
470 | if (IS_ERR(ceph_opts)) |
471 | return PTR_ERR(ceph_opts); | |
602adf40 | 472 | |
069a4b56 AE |
473 | /* Record the parsed rbd options */ |
474 | ||
475 | rbd_dev->mapping.read_only = rbd_opts.read_only; | |
476 | ||
1f7ba331 | 477 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 478 | if (rbdc) { |
602adf40 | 479 | /* using an existing client */ |
43ae4701 | 480 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
481 | } else { |
482 | rbdc = rbd_client_create(ceph_opts); | |
483 | if (IS_ERR(rbdc)) | |
484 | return PTR_ERR(rbdc); | |
602adf40 | 485 | } |
f8c38929 | 486 | rbd_dev->rbd_client = rbdc; |
602adf40 | 487 | |
f8c38929 | 488 | return 0; |
602adf40 YS |
489 | } |
490 | ||
491 | /* | |
492 | * Destroy ceph client | |
d23a4b3f | 493 | * |
432b8587 | 494 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
495 | */ |
496 | static void rbd_client_release(struct kref *kref) | |
497 | { | |
498 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
499 | ||
500 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 501 | spin_lock(&rbd_client_list_lock); |
602adf40 | 502 | list_del(&rbdc->node); |
cd9d9f5d | 503 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
504 | |
505 | ceph_destroy_client(rbdc->client); | |
506 | kfree(rbdc); | |
507 | } | |
508 | ||
509 | /* | |
510 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
511 | * it. | |
512 | */ | |
513 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
514 | { | |
515 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
516 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
517 | } |
518 | ||
1fec7093 YS |
519 | /* |
520 | * Destroy requests collection | |
521 | */ | |
522 | static void rbd_coll_release(struct kref *kref) | |
523 | { | |
524 | struct rbd_req_coll *coll = | |
525 | container_of(kref, struct rbd_req_coll, kref); | |
526 | ||
527 | dout("rbd_coll_release %p\n", coll); | |
528 | kfree(coll); | |
529 | } | |
602adf40 | 530 | |
a30b71b9 AE |
531 | static bool rbd_image_format_valid(u32 image_format) |
532 | { | |
533 | return image_format == 1 || image_format == 2; | |
534 | } | |
535 | ||
8e94af8e AE |
536 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
537 | { | |
103a150f AE |
538 | size_t size; |
539 | u32 snap_count; | |
540 | ||
541 | /* The header has to start with the magic rbd header text */ | |
542 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
543 | return false; | |
544 | ||
db2388b6 AE |
545 | /* The bio layer requires at least sector-sized I/O */ |
546 | ||
547 | if (ondisk->options.order < SECTOR_SHIFT) | |
548 | return false; | |
549 | ||
550 | /* If we use u64 in a few spots we may be able to loosen this */ | |
551 | ||
552 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
553 | return false; | |
554 | ||
103a150f AE |
555 | /* |
556 | * The size of a snapshot header has to fit in a size_t, and | |
557 | * that limits the number of snapshots. | |
558 | */ | |
559 | snap_count = le32_to_cpu(ondisk->snap_count); | |
560 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
561 | if (snap_count > size / sizeof (__le64)) | |
562 | return false; | |
563 | ||
564 | /* | |
565 | * Not only that, but the size of the entire the snapshot | |
566 | * header must also be representable in a size_t. | |
567 | */ | |
568 | size -= snap_count * sizeof (__le64); | |
569 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
570 | return false; | |
571 | ||
572 | return true; | |
8e94af8e AE |
573 | } |
574 | ||
602adf40 YS |
575 | /* |
576 | * Create a new header structure, translate header format from the on-disk | |
577 | * header. | |
578 | */ | |
579 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 580 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 581 | { |
ccece235 | 582 | u32 snap_count; |
58c17b0e | 583 | size_t len; |
d2bb24e5 | 584 | size_t size; |
621901d6 | 585 | u32 i; |
602adf40 | 586 | |
6a52325f AE |
587 | memset(header, 0, sizeof (*header)); |
588 | ||
103a150f AE |
589 | snap_count = le32_to_cpu(ondisk->snap_count); |
590 | ||
58c17b0e AE |
591 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
592 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 593 | if (!header->object_prefix) |
602adf40 | 594 | return -ENOMEM; |
58c17b0e AE |
595 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
596 | header->object_prefix[len] = '\0'; | |
00f1f36f | 597 | |
602adf40 | 598 | if (snap_count) { |
f785cc1d AE |
599 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
600 | ||
621901d6 AE |
601 | /* Save a copy of the snapshot names */ |
602 | ||
f785cc1d AE |
603 | if (snap_names_len > (u64) SIZE_MAX) |
604 | return -EIO; | |
605 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 606 | if (!header->snap_names) |
6a52325f | 607 | goto out_err; |
f785cc1d AE |
608 | /* |
609 | * Note that rbd_dev_v1_header_read() guarantees | |
610 | * the ondisk buffer we're working with has | |
611 | * snap_names_len bytes beyond the end of the | |
612 | * snapshot id array, this memcpy() is safe. | |
613 | */ | |
614 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
615 | snap_names_len); | |
6a52325f | 616 | |
621901d6 AE |
617 | /* Record each snapshot's size */ |
618 | ||
d2bb24e5 AE |
619 | size = snap_count * sizeof (*header->snap_sizes); |
620 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 621 | if (!header->snap_sizes) |
6a52325f | 622 | goto out_err; |
621901d6 AE |
623 | for (i = 0; i < snap_count; i++) |
624 | header->snap_sizes[i] = | |
625 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 626 | } else { |
ccece235 | 627 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
628 | header->snap_names = NULL; |
629 | header->snap_sizes = NULL; | |
630 | } | |
849b4260 | 631 | |
34b13184 | 632 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
633 | header->obj_order = ondisk->options.order; |
634 | header->crypt_type = ondisk->options.crypt_type; | |
635 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 636 | |
621901d6 AE |
637 | /* Allocate and fill in the snapshot context */ |
638 | ||
f84344f3 | 639 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
640 | size = sizeof (struct ceph_snap_context); |
641 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
642 | header->snapc = kzalloc(size, GFP_KERNEL); | |
643 | if (!header->snapc) | |
644 | goto out_err; | |
602adf40 YS |
645 | |
646 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 647 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 648 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
649 | for (i = 0; i < snap_count; i++) |
650 | header->snapc->snaps[i] = | |
651 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
652 | |
653 | return 0; | |
654 | ||
6a52325f | 655 | out_err: |
849b4260 | 656 | kfree(header->snap_sizes); |
ccece235 | 657 | header->snap_sizes = NULL; |
602adf40 | 658 | kfree(header->snap_names); |
ccece235 | 659 | header->snap_names = NULL; |
6a52325f AE |
660 | kfree(header->object_prefix); |
661 | header->object_prefix = NULL; | |
ccece235 | 662 | |
00f1f36f | 663 | return -ENOMEM; |
602adf40 YS |
664 | } |
665 | ||
8836b995 | 666 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 667 | { |
602adf40 | 668 | |
e86924a8 | 669 | struct rbd_snap *snap; |
602adf40 | 670 | |
e86924a8 AE |
671 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
672 | if (!strcmp(snap_name, snap->name)) { | |
971f839a | 673 | rbd_dev->snap_id = snap->id; |
e86924a8 | 674 | rbd_dev->mapping.size = snap->size; |
34b13184 | 675 | rbd_dev->mapping.features = snap->features; |
602adf40 | 676 | |
e86924a8 | 677 | return 0; |
00f1f36f | 678 | } |
00f1f36f | 679 | } |
e86924a8 | 680 | |
00f1f36f | 681 | return -ENOENT; |
602adf40 YS |
682 | } |
683 | ||
5ed16177 | 684 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev, char *snap_name) |
602adf40 | 685 | { |
78dc447d | 686 | int ret; |
602adf40 | 687 | |
4e1105a2 | 688 | if (!memcmp(snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 689 | sizeof (RBD_SNAP_HEAD_NAME))) { |
971f839a | 690 | rbd_dev->snap_id = CEPH_NOSNAP; |
99c1f08f | 691 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 692 | rbd_dev->mapping.features = rbd_dev->header.features; |
e86924a8 | 693 | ret = 0; |
602adf40 | 694 | } else { |
8836b995 | 695 | ret = snap_by_name(rbd_dev, snap_name); |
602adf40 YS |
696 | if (ret < 0) |
697 | goto done; | |
f84344f3 | 698 | rbd_dev->mapping.read_only = true; |
602adf40 | 699 | } |
971f839a | 700 | rbd_dev->snap_name = snap_name; |
daba5fdb | 701 | rbd_dev->exists = true; |
602adf40 | 702 | done: |
602adf40 YS |
703 | return ret; |
704 | } | |
705 | ||
706 | static void rbd_header_free(struct rbd_image_header *header) | |
707 | { | |
849b4260 | 708 | kfree(header->object_prefix); |
d78fd7ae | 709 | header->object_prefix = NULL; |
602adf40 | 710 | kfree(header->snap_sizes); |
d78fd7ae | 711 | header->snap_sizes = NULL; |
849b4260 | 712 | kfree(header->snap_names); |
d78fd7ae | 713 | header->snap_names = NULL; |
d1d25646 | 714 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 715 | header->snapc = NULL; |
602adf40 YS |
716 | } |
717 | ||
65ccfe21 | 718 | static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 719 | { |
65ccfe21 AE |
720 | char *name; |
721 | u64 segment; | |
722 | int ret; | |
602adf40 | 723 | |
65ccfe21 AE |
724 | name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
725 | if (!name) | |
726 | return NULL; | |
727 | segment = offset >> rbd_dev->header.obj_order; | |
728 | ret = snprintf(name, RBD_MAX_SEG_NAME_LEN, "%s.%012llx", | |
729 | rbd_dev->header.object_prefix, segment); | |
730 | if (ret < 0 || ret >= RBD_MAX_SEG_NAME_LEN) { | |
731 | pr_err("error formatting segment name for #%llu (%d)\n", | |
732 | segment, ret); | |
733 | kfree(name); | |
734 | name = NULL; | |
735 | } | |
602adf40 | 736 | |
65ccfe21 AE |
737 | return name; |
738 | } | |
602adf40 | 739 | |
65ccfe21 AE |
740 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
741 | { | |
742 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 743 | |
65ccfe21 AE |
744 | return offset & (segment_size - 1); |
745 | } | |
746 | ||
747 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
748 | u64 offset, u64 length) | |
749 | { | |
750 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
751 | ||
752 | offset &= segment_size - 1; | |
753 | ||
aafb230e | 754 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
755 | if (offset + length > segment_size) |
756 | length = segment_size - offset; | |
757 | ||
758 | return length; | |
602adf40 YS |
759 | } |
760 | ||
1fec7093 YS |
761 | static int rbd_get_num_segments(struct rbd_image_header *header, |
762 | u64 ofs, u64 len) | |
763 | { | |
df111be6 AE |
764 | u64 start_seg; |
765 | u64 end_seg; | |
766 | ||
767 | if (!len) | |
768 | return 0; | |
769 | if (len - 1 > U64_MAX - ofs) | |
770 | return -ERANGE; | |
771 | ||
772 | start_seg = ofs >> header->obj_order; | |
773 | end_seg = (ofs + len - 1) >> header->obj_order; | |
774 | ||
1fec7093 YS |
775 | return end_seg - start_seg + 1; |
776 | } | |
777 | ||
029bcbd8 JD |
778 | /* |
779 | * returns the size of an object in the image | |
780 | */ | |
781 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
782 | { | |
783 | return 1 << header->obj_order; | |
784 | } | |
785 | ||
602adf40 YS |
786 | /* |
787 | * bio helpers | |
788 | */ | |
789 | ||
790 | static void bio_chain_put(struct bio *chain) | |
791 | { | |
792 | struct bio *tmp; | |
793 | ||
794 | while (chain) { | |
795 | tmp = chain; | |
796 | chain = chain->bi_next; | |
797 | bio_put(tmp); | |
798 | } | |
799 | } | |
800 | ||
801 | /* | |
802 | * zeros a bio chain, starting at specific offset | |
803 | */ | |
804 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
805 | { | |
806 | struct bio_vec *bv; | |
807 | unsigned long flags; | |
808 | void *buf; | |
809 | int i; | |
810 | int pos = 0; | |
811 | ||
812 | while (chain) { | |
813 | bio_for_each_segment(bv, chain, i) { | |
814 | if (pos + bv->bv_len > start_ofs) { | |
815 | int remainder = max(start_ofs - pos, 0); | |
816 | buf = bvec_kmap_irq(bv, &flags); | |
817 | memset(buf + remainder, 0, | |
818 | bv->bv_len - remainder); | |
85b5aaa6 | 819 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
820 | } |
821 | pos += bv->bv_len; | |
822 | } | |
823 | ||
824 | chain = chain->bi_next; | |
825 | } | |
826 | } | |
827 | ||
828 | /* | |
f7760dad AE |
829 | * Clone a portion of a bio, starting at the given byte offset |
830 | * and continuing for the number of bytes indicated. | |
602adf40 | 831 | */ |
f7760dad AE |
832 | static struct bio *bio_clone_range(struct bio *bio_src, |
833 | unsigned int offset, | |
834 | unsigned int len, | |
835 | gfp_t gfpmask) | |
602adf40 | 836 | { |
f7760dad AE |
837 | struct bio_vec *bv; |
838 | unsigned int resid; | |
839 | unsigned short idx; | |
840 | unsigned int voff; | |
841 | unsigned short end_idx; | |
842 | unsigned short vcnt; | |
843 | struct bio *bio; | |
844 | ||
845 | /* Handle the easy case for the caller */ | |
846 | ||
847 | if (!offset && len == bio_src->bi_size) | |
848 | return bio_clone(bio_src, gfpmask); | |
849 | ||
850 | if (WARN_ON_ONCE(!len)) | |
851 | return NULL; | |
852 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
853 | return NULL; | |
854 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
855 | return NULL; | |
856 | ||
857 | /* Find first affected segment... */ | |
858 | ||
859 | resid = offset; | |
860 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
861 | if (resid < bv->bv_len) | |
862 | break; | |
863 | resid -= bv->bv_len; | |
602adf40 | 864 | } |
f7760dad | 865 | voff = resid; |
602adf40 | 866 | |
f7760dad | 867 | /* ...and the last affected segment */ |
602adf40 | 868 | |
f7760dad AE |
869 | resid += len; |
870 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
871 | if (resid <= bv->bv_len) | |
872 | break; | |
873 | resid -= bv->bv_len; | |
874 | } | |
875 | vcnt = end_idx - idx + 1; | |
876 | ||
877 | /* Build the clone */ | |
878 | ||
879 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
880 | if (!bio) | |
881 | return NULL; /* ENOMEM */ | |
602adf40 | 882 | |
f7760dad AE |
883 | bio->bi_bdev = bio_src->bi_bdev; |
884 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
885 | bio->bi_rw = bio_src->bi_rw; | |
886 | bio->bi_flags |= 1 << BIO_CLONED; | |
887 | ||
888 | /* | |
889 | * Copy over our part of the bio_vec, then update the first | |
890 | * and last (or only) entries. | |
891 | */ | |
892 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
893 | vcnt * sizeof (struct bio_vec)); | |
894 | bio->bi_io_vec[0].bv_offset += voff; | |
895 | if (vcnt > 1) { | |
896 | bio->bi_io_vec[0].bv_len -= voff; | |
897 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
898 | } else { | |
899 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
900 | } |
901 | ||
f7760dad AE |
902 | bio->bi_vcnt = vcnt; |
903 | bio->bi_size = len; | |
904 | bio->bi_idx = 0; | |
905 | ||
906 | return bio; | |
907 | } | |
908 | ||
909 | /* | |
910 | * Clone a portion of a bio chain, starting at the given byte offset | |
911 | * into the first bio in the source chain and continuing for the | |
912 | * number of bytes indicated. The result is another bio chain of | |
913 | * exactly the given length, or a null pointer on error. | |
914 | * | |
915 | * The bio_src and offset parameters are both in-out. On entry they | |
916 | * refer to the first source bio and the offset into that bio where | |
917 | * the start of data to be cloned is located. | |
918 | * | |
919 | * On return, bio_src is updated to refer to the bio in the source | |
920 | * chain that contains first un-cloned byte, and *offset will | |
921 | * contain the offset of that byte within that bio. | |
922 | */ | |
923 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
924 | unsigned int *offset, | |
925 | unsigned int len, | |
926 | gfp_t gfpmask) | |
927 | { | |
928 | struct bio *bi = *bio_src; | |
929 | unsigned int off = *offset; | |
930 | struct bio *chain = NULL; | |
931 | struct bio **end; | |
932 | ||
933 | /* Build up a chain of clone bios up to the limit */ | |
934 | ||
935 | if (!bi || off >= bi->bi_size || !len) | |
936 | return NULL; /* Nothing to clone */ | |
602adf40 | 937 | |
f7760dad AE |
938 | end = &chain; |
939 | while (len) { | |
940 | unsigned int bi_size; | |
941 | struct bio *bio; | |
942 | ||
943 | if (!bi) | |
944 | goto out_err; /* EINVAL; ran out of bio's */ | |
945 | bi_size = min_t(unsigned int, bi->bi_size - off, len); | |
946 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
947 | if (!bio) | |
948 | goto out_err; /* ENOMEM */ | |
949 | ||
950 | *end = bio; | |
951 | end = &bio->bi_next; | |
602adf40 | 952 | |
f7760dad AE |
953 | off += bi_size; |
954 | if (off == bi->bi_size) { | |
955 | bi = bi->bi_next; | |
956 | off = 0; | |
957 | } | |
958 | len -= bi_size; | |
959 | } | |
960 | *bio_src = bi; | |
961 | *offset = off; | |
962 | ||
963 | return chain; | |
964 | out_err: | |
965 | bio_chain_put(chain); | |
602adf40 | 966 | |
602adf40 YS |
967 | return NULL; |
968 | } | |
969 | ||
970 | /* | |
971 | * helpers for osd request op vectors. | |
972 | */ | |
57cfc106 AE |
973 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
974 | int opcode, u32 payload_len) | |
602adf40 | 975 | { |
57cfc106 AE |
976 | struct ceph_osd_req_op *ops; |
977 | ||
978 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
979 | if (!ops) | |
980 | return NULL; | |
981 | ||
982 | ops[0].op = opcode; | |
983 | ||
602adf40 YS |
984 | /* |
985 | * op extent offset and length will be set later on | |
986 | * in calc_raw_layout() | |
987 | */ | |
57cfc106 AE |
988 | ops[0].payload_len = payload_len; |
989 | ||
990 | return ops; | |
602adf40 YS |
991 | } |
992 | ||
993 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
994 | { | |
995 | kfree(ops); | |
996 | } | |
997 | ||
1fec7093 YS |
998 | static void rbd_coll_end_req_index(struct request *rq, |
999 | struct rbd_req_coll *coll, | |
1000 | int index, | |
1001 | int ret, u64 len) | |
1002 | { | |
1003 | struct request_queue *q; | |
1004 | int min, max, i; | |
1005 | ||
bd919d45 AE |
1006 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
1007 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
1008 | |
1009 | if (!rq) | |
1010 | return; | |
1011 | ||
1012 | if (!coll) { | |
1013 | blk_end_request(rq, ret, len); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | q = rq->q; | |
1018 | ||
1019 | spin_lock_irq(q->queue_lock); | |
1020 | coll->status[index].done = 1; | |
1021 | coll->status[index].rc = ret; | |
1022 | coll->status[index].bytes = len; | |
1023 | max = min = coll->num_done; | |
1024 | while (max < coll->total && coll->status[max].done) | |
1025 | max++; | |
1026 | ||
1027 | for (i = min; i<max; i++) { | |
1028 | __blk_end_request(rq, coll->status[i].rc, | |
1029 | coll->status[i].bytes); | |
1030 | coll->num_done++; | |
1031 | kref_put(&coll->kref, rbd_coll_release); | |
1032 | } | |
1033 | spin_unlock_irq(q->queue_lock); | |
1034 | } | |
1035 | ||
1036 | static void rbd_coll_end_req(struct rbd_request *req, | |
1037 | int ret, u64 len) | |
1038 | { | |
1039 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
1040 | } | |
1041 | ||
602adf40 YS |
1042 | /* |
1043 | * Send ceph osd request | |
1044 | */ | |
1045 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 1046 | struct rbd_device *rbd_dev, |
602adf40 YS |
1047 | struct ceph_snap_context *snapc, |
1048 | u64 snapid, | |
aded07ea | 1049 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
1050 | struct bio *bio, |
1051 | struct page **pages, | |
1052 | int num_pages, | |
1053 | int flags, | |
1054 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
1055 | struct rbd_req_coll *coll, |
1056 | int coll_index, | |
602adf40 | 1057 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
1058 | struct ceph_msg *msg), |
1059 | struct ceph_osd_request **linger_req, | |
1060 | u64 *ver) | |
602adf40 YS |
1061 | { |
1062 | struct ceph_osd_request *req; | |
1063 | struct ceph_file_layout *layout; | |
1064 | int ret; | |
1065 | u64 bno; | |
1066 | struct timespec mtime = CURRENT_TIME; | |
1067 | struct rbd_request *req_data; | |
1068 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 1069 | struct ceph_osd_client *osdc; |
602adf40 | 1070 | |
602adf40 | 1071 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
1072 | if (!req_data) { |
1073 | if (coll) | |
1074 | rbd_coll_end_req_index(rq, coll, coll_index, | |
1075 | -ENOMEM, len); | |
1076 | return -ENOMEM; | |
1077 | } | |
1078 | ||
1079 | if (coll) { | |
1080 | req_data->coll = coll; | |
1081 | req_data->coll_index = coll_index; | |
1082 | } | |
602adf40 | 1083 | |
f7760dad AE |
1084 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu coll=%p[%d]\n", |
1085 | object_name, (unsigned long long) ofs, | |
1086 | (unsigned long long) len, coll, coll_index); | |
602adf40 | 1087 | |
0ce1a794 | 1088 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
1089 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
1090 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 1091 | if (!req) { |
4ad12621 | 1092 | ret = -ENOMEM; |
602adf40 YS |
1093 | goto done_pages; |
1094 | } | |
1095 | ||
1096 | req->r_callback = rbd_cb; | |
1097 | ||
1098 | req_data->rq = rq; | |
1099 | req_data->bio = bio; | |
1100 | req_data->pages = pages; | |
1101 | req_data->len = len; | |
1102 | ||
1103 | req->r_priv = req_data; | |
1104 | ||
1105 | reqhead = req->r_request->front.iov_base; | |
1106 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
1107 | ||
aded07ea | 1108 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
1109 | req->r_oid_len = strlen(req->r_oid); |
1110 | ||
1111 | layout = &req->r_file_layout; | |
1112 | memset(layout, 0, sizeof(*layout)); | |
1113 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
1114 | layout->fl_stripe_count = cpu_to_le32(1); | |
1115 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
86992098 | 1116 | layout->fl_pg_pool = cpu_to_le32((int) rbd_dev->pool_id); |
6cae3717 SW |
1117 | ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
1118 | req, ops); | |
1119 | rbd_assert(ret == 0); | |
602adf40 YS |
1120 | |
1121 | ceph_osdc_build_request(req, ofs, &len, | |
1122 | ops, | |
1123 | snapc, | |
1124 | &mtime, | |
1125 | req->r_oid, req->r_oid_len); | |
602adf40 | 1126 | |
59c2be1e | 1127 | if (linger_req) { |
1dbb4399 | 1128 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
1129 | *linger_req = req; |
1130 | } | |
1131 | ||
1dbb4399 | 1132 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
1133 | if (ret < 0) |
1134 | goto done_err; | |
1135 | ||
1136 | if (!rbd_cb) { | |
1dbb4399 | 1137 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1138 | if (ver) |
1139 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1140 | dout("reassert_ver=%llu\n", |
1141 | (unsigned long long) | |
1142 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1143 | ceph_osdc_put_request(req); |
1144 | } | |
1145 | return ret; | |
1146 | ||
1147 | done_err: | |
1148 | bio_chain_put(req_data->bio); | |
1149 | ceph_osdc_put_request(req); | |
1150 | done_pages: | |
1fec7093 | 1151 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1152 | kfree(req_data); |
602adf40 YS |
1153 | return ret; |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Ceph osd op callback | |
1158 | */ | |
1159 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1160 | { | |
1161 | struct rbd_request *req_data = req->r_priv; | |
1162 | struct ceph_osd_reply_head *replyhead; | |
1163 | struct ceph_osd_op *op; | |
1164 | __s32 rc; | |
1165 | u64 bytes; | |
1166 | int read_op; | |
1167 | ||
1168 | /* parse reply */ | |
1169 | replyhead = msg->front.iov_base; | |
1170 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1171 | op = (void *)(replyhead + 1); | |
1172 | rc = le32_to_cpu(replyhead->result); | |
1173 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1174 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1175 | |
bd919d45 AE |
1176 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1177 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1178 | |
1179 | if (rc == -ENOENT && read_op) { | |
1180 | zero_bio_chain(req_data->bio, 0); | |
1181 | rc = 0; | |
1182 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1183 | zero_bio_chain(req_data->bio, bytes); | |
1184 | bytes = req_data->len; | |
1185 | } | |
1186 | ||
1fec7093 | 1187 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1188 | |
1189 | if (req_data->bio) | |
1190 | bio_chain_put(req_data->bio); | |
1191 | ||
1192 | ceph_osdc_put_request(req); | |
1193 | kfree(req_data); | |
1194 | } | |
1195 | ||
59c2be1e YS |
1196 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1197 | { | |
1198 | ceph_osdc_put_request(req); | |
1199 | } | |
1200 | ||
602adf40 YS |
1201 | /* |
1202 | * Do a synchronous ceph osd operation | |
1203 | */ | |
0ce1a794 | 1204 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1205 | struct ceph_snap_context *snapc, |
1206 | u64 snapid, | |
602adf40 | 1207 | int flags, |
913d2fdc | 1208 | struct ceph_osd_req_op *ops, |
aded07ea | 1209 | const char *object_name, |
f8d4de6e AE |
1210 | u64 ofs, u64 inbound_size, |
1211 | char *inbound, | |
59c2be1e YS |
1212 | struct ceph_osd_request **linger_req, |
1213 | u64 *ver) | |
602adf40 YS |
1214 | { |
1215 | int ret; | |
1216 | struct page **pages; | |
1217 | int num_pages; | |
913d2fdc | 1218 | |
aafb230e | 1219 | rbd_assert(ops != NULL); |
602adf40 | 1220 | |
f8d4de6e | 1221 | num_pages = calc_pages_for(ofs, inbound_size); |
602adf40 | 1222 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
b8d0638a DC |
1223 | if (IS_ERR(pages)) |
1224 | return PTR_ERR(pages); | |
602adf40 | 1225 | |
0ce1a794 | 1226 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
f8d4de6e | 1227 | object_name, ofs, inbound_size, NULL, |
602adf40 YS |
1228 | pages, num_pages, |
1229 | flags, | |
1230 | ops, | |
1fec7093 | 1231 | NULL, 0, |
59c2be1e YS |
1232 | NULL, |
1233 | linger_req, ver); | |
602adf40 | 1234 | if (ret < 0) |
913d2fdc | 1235 | goto done; |
602adf40 | 1236 | |
f8d4de6e AE |
1237 | if ((flags & CEPH_OSD_FLAG_READ) && inbound) |
1238 | ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret); | |
602adf40 | 1239 | |
602adf40 YS |
1240 | done: |
1241 | ceph_release_page_vector(pages, num_pages); | |
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Do an asynchronous ceph osd operation | |
1247 | */ | |
1248 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1249 | struct rbd_device *rbd_dev, |
602adf40 | 1250 | struct ceph_snap_context *snapc, |
602adf40 | 1251 | u64 ofs, u64 len, |
1fec7093 YS |
1252 | struct bio *bio, |
1253 | struct rbd_req_coll *coll, | |
1254 | int coll_index) | |
602adf40 YS |
1255 | { |
1256 | char *seg_name; | |
1257 | u64 seg_ofs; | |
1258 | u64 seg_len; | |
1259 | int ret; | |
1260 | struct ceph_osd_req_op *ops; | |
1261 | u32 payload_len; | |
ff2e4bb5 AE |
1262 | int opcode; |
1263 | int flags; | |
4634246d | 1264 | u64 snapid; |
602adf40 | 1265 | |
65ccfe21 | 1266 | seg_name = rbd_segment_name(rbd_dev, ofs); |
602adf40 YS |
1267 | if (!seg_name) |
1268 | return -ENOMEM; | |
65ccfe21 AE |
1269 | seg_len = rbd_segment_length(rbd_dev, ofs, len); |
1270 | seg_ofs = rbd_segment_offset(rbd_dev, ofs); | |
602adf40 | 1271 | |
ff2e4bb5 AE |
1272 | if (rq_data_dir(rq) == WRITE) { |
1273 | opcode = CEPH_OSD_OP_WRITE; | |
1274 | flags = CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK; | |
4634246d | 1275 | snapid = CEPH_NOSNAP; |
ff2e4bb5 AE |
1276 | payload_len = seg_len; |
1277 | } else { | |
1278 | opcode = CEPH_OSD_OP_READ; | |
1279 | flags = CEPH_OSD_FLAG_READ; | |
4634246d | 1280 | snapc = NULL; |
971f839a | 1281 | snapid = rbd_dev->snap_id; |
ff2e4bb5 AE |
1282 | payload_len = 0; |
1283 | } | |
602adf40 | 1284 | |
57cfc106 AE |
1285 | ret = -ENOMEM; |
1286 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1287 | if (!ops) | |
602adf40 YS |
1288 | goto done; |
1289 | ||
1290 | /* we've taken care of segment sizes earlier when we | |
1291 | cloned the bios. We should never have a segment | |
1292 | truncated at this point */ | |
aafb230e | 1293 | rbd_assert(seg_len == len); |
602adf40 YS |
1294 | |
1295 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1296 | seg_name, seg_ofs, seg_len, | |
1297 | bio, | |
1298 | NULL, 0, | |
1299 | flags, | |
1300 | ops, | |
1fec7093 | 1301 | coll, coll_index, |
59c2be1e | 1302 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1303 | |
1304 | rbd_destroy_ops(ops); | |
602adf40 YS |
1305 | done: |
1306 | kfree(seg_name); | |
1307 | return ret; | |
1308 | } | |
1309 | ||
602adf40 YS |
1310 | /* |
1311 | * Request sync osd read | |
1312 | */ | |
0ce1a794 | 1313 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1314 | u64 snapid, |
aded07ea | 1315 | const char *object_name, |
602adf40 | 1316 | u64 ofs, u64 len, |
59c2be1e YS |
1317 | char *buf, |
1318 | u64 *ver) | |
602adf40 | 1319 | { |
913d2fdc AE |
1320 | struct ceph_osd_req_op *ops; |
1321 | int ret; | |
1322 | ||
1323 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1324 | if (!ops) | |
1325 | return -ENOMEM; | |
1326 | ||
1327 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1328 | snapid, |
602adf40 | 1329 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1330 | ops, object_name, ofs, len, buf, NULL, ver); |
1331 | rbd_destroy_ops(ops); | |
1332 | ||
1333 | return ret; | |
602adf40 YS |
1334 | } |
1335 | ||
1336 | /* | |
59c2be1e YS |
1337 | * Request sync osd watch |
1338 | */ | |
0ce1a794 | 1339 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1340 | u64 ver, |
7f0a24d8 | 1341 | u64 notify_id) |
59c2be1e YS |
1342 | { |
1343 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1344 | int ret; |
1345 | ||
57cfc106 AE |
1346 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1347 | if (!ops) | |
1348 | return -ENOMEM; | |
59c2be1e | 1349 | |
a71b891b | 1350 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1351 | ops[0].watch.cookie = notify_id; |
1352 | ops[0].watch.flag = 0; | |
1353 | ||
0ce1a794 | 1354 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1355 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1356 | NULL, 0, |
59c2be1e YS |
1357 | CEPH_OSD_FLAG_READ, |
1358 | ops, | |
1fec7093 | 1359 | NULL, 0, |
59c2be1e YS |
1360 | rbd_simple_req_cb, 0, NULL); |
1361 | ||
1362 | rbd_destroy_ops(ops); | |
1363 | return ret; | |
1364 | } | |
1365 | ||
1366 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1367 | { | |
0ce1a794 | 1368 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1369 | u64 hver; |
13143d2d SW |
1370 | int rc; |
1371 | ||
0ce1a794 | 1372 | if (!rbd_dev) |
59c2be1e YS |
1373 | return; |
1374 | ||
bd919d45 AE |
1375 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1376 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1377 | (unsigned int) opcode); | |
117973fb | 1378 | rc = rbd_dev_refresh(rbd_dev, &hver); |
13143d2d | 1379 | if (rc) |
f0f8cef5 | 1380 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1381 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1382 | |
7f0a24d8 | 1383 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1384 | } |
1385 | ||
1386 | /* | |
1387 | * Request sync osd watch | |
1388 | */ | |
0e6f322d | 1389 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1390 | { |
1391 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1392 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1393 | int ret; |
59c2be1e | 1394 | |
57cfc106 AE |
1395 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1396 | if (!ops) | |
1397 | return -ENOMEM; | |
59c2be1e YS |
1398 | |
1399 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1400 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1401 | if (ret < 0) |
1402 | goto fail; | |
1403 | ||
0e6f322d | 1404 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1405 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1406 | ops[0].watch.flag = 1; |
1407 | ||
0ce1a794 | 1408 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1409 | CEPH_NOSNAP, |
59c2be1e YS |
1410 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1411 | ops, | |
0e6f322d AE |
1412 | rbd_dev->header_name, |
1413 | 0, 0, NULL, | |
0ce1a794 | 1414 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1415 | |
1416 | if (ret < 0) | |
1417 | goto fail_event; | |
1418 | ||
1419 | rbd_destroy_ops(ops); | |
1420 | return 0; | |
1421 | ||
1422 | fail_event: | |
0ce1a794 AE |
1423 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1424 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1425 | fail: |
1426 | rbd_destroy_ops(ops); | |
1427 | return ret; | |
1428 | } | |
1429 | ||
79e3057c YS |
1430 | /* |
1431 | * Request sync osd unwatch | |
1432 | */ | |
070c633f | 1433 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1434 | { |
1435 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1436 | int ret; |
79e3057c | 1437 | |
57cfc106 AE |
1438 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1439 | if (!ops) | |
1440 | return -ENOMEM; | |
79e3057c YS |
1441 | |
1442 | ops[0].watch.ver = 0; | |
0ce1a794 | 1443 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1444 | ops[0].watch.flag = 0; |
1445 | ||
0ce1a794 | 1446 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1447 | CEPH_NOSNAP, |
79e3057c YS |
1448 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1449 | ops, | |
070c633f AE |
1450 | rbd_dev->header_name, |
1451 | 0, 0, NULL, NULL, NULL); | |
1452 | ||
79e3057c YS |
1453 | |
1454 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1455 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1456 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1457 | return ret; |
1458 | } | |
1459 | ||
602adf40 | 1460 | /* |
3cb4a687 | 1461 | * Synchronous osd object method call |
602adf40 | 1462 | */ |
0ce1a794 | 1463 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1464 | const char *object_name, |
1465 | const char *class_name, | |
1466 | const char *method_name, | |
3cb4a687 AE |
1467 | const char *outbound, |
1468 | size_t outbound_size, | |
f8d4de6e AE |
1469 | char *inbound, |
1470 | size_t inbound_size, | |
3cb4a687 | 1471 | int flags, |
59c2be1e | 1472 | u64 *ver) |
602adf40 YS |
1473 | { |
1474 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1475 | int class_name_len = strlen(class_name); |
1476 | int method_name_len = strlen(method_name); | |
3cb4a687 | 1477 | int payload_size; |
57cfc106 AE |
1478 | int ret; |
1479 | ||
3cb4a687 AE |
1480 | /* |
1481 | * Any input parameters required by the method we're calling | |
1482 | * will be sent along with the class and method names as | |
1483 | * part of the message payload. That data and its size are | |
1484 | * supplied via the indata and indata_len fields (named from | |
1485 | * the perspective of the server side) in the OSD request | |
1486 | * operation. | |
1487 | */ | |
1488 | payload_size = class_name_len + method_name_len + outbound_size; | |
1489 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size); | |
57cfc106 AE |
1490 | if (!ops) |
1491 | return -ENOMEM; | |
602adf40 | 1492 | |
aded07ea AE |
1493 | ops[0].cls.class_name = class_name; |
1494 | ops[0].cls.class_len = (__u8) class_name_len; | |
1495 | ops[0].cls.method_name = method_name; | |
1496 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 | 1497 | ops[0].cls.argc = 0; |
3cb4a687 AE |
1498 | ops[0].cls.indata = outbound; |
1499 | ops[0].cls.indata_len = outbound_size; | |
602adf40 | 1500 | |
0ce1a794 | 1501 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1502 | CEPH_NOSNAP, |
3cb4a687 | 1503 | flags, ops, |
f8d4de6e AE |
1504 | object_name, 0, inbound_size, inbound, |
1505 | NULL, ver); | |
602adf40 YS |
1506 | |
1507 | rbd_destroy_ops(ops); | |
1508 | ||
1509 | dout("cls_exec returned %d\n", ret); | |
1510 | return ret; | |
1511 | } | |
1512 | ||
1fec7093 YS |
1513 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1514 | { | |
1515 | struct rbd_req_coll *coll = | |
1516 | kzalloc(sizeof(struct rbd_req_coll) + | |
1517 | sizeof(struct rbd_req_status) * num_reqs, | |
1518 | GFP_ATOMIC); | |
1519 | ||
1520 | if (!coll) | |
1521 | return NULL; | |
1522 | coll->total = num_reqs; | |
1523 | kref_init(&coll->kref); | |
1524 | return coll; | |
1525 | } | |
1526 | ||
602adf40 YS |
1527 | /* |
1528 | * block device queue callback | |
1529 | */ | |
1530 | static void rbd_rq_fn(struct request_queue *q) | |
1531 | { | |
1532 | struct rbd_device *rbd_dev = q->queuedata; | |
1533 | struct request *rq; | |
602adf40 | 1534 | |
00f1f36f | 1535 | while ((rq = blk_fetch_request(q))) { |
602adf40 | 1536 | struct bio *bio; |
602adf40 | 1537 | bool do_write; |
bd919d45 | 1538 | unsigned int size; |
602adf40 | 1539 | u64 ofs; |
1fec7093 YS |
1540 | int num_segs, cur_seg = 0; |
1541 | struct rbd_req_coll *coll; | |
d1d25646 | 1542 | struct ceph_snap_context *snapc; |
f7760dad | 1543 | unsigned int bio_offset; |
602adf40 | 1544 | |
602adf40 YS |
1545 | dout("fetched request\n"); |
1546 | ||
1547 | /* filter out block requests we don't understand */ | |
1548 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1549 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1550 | continue; |
602adf40 YS |
1551 | } |
1552 | ||
1553 | /* deduce our operation (read, write) */ | |
1554 | do_write = (rq_data_dir(rq) == WRITE); | |
f84344f3 | 1555 | if (do_write && rbd_dev->mapping.read_only) { |
602adf40 | 1556 | __blk_end_request_all(rq, -EROFS); |
00f1f36f | 1557 | continue; |
602adf40 YS |
1558 | } |
1559 | ||
1560 | spin_unlock_irq(q->queue_lock); | |
1561 | ||
d1d25646 | 1562 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1563 | |
daba5fdb AE |
1564 | if (!rbd_dev->exists) { |
1565 | rbd_assert(rbd_dev->snap_id != CEPH_NOSNAP); | |
e88a36ec | 1566 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1567 | dout("request for non-existent snapshot"); |
1568 | spin_lock_irq(q->queue_lock); | |
1569 | __blk_end_request_all(rq, -ENXIO); | |
1570 | continue; | |
e88a36ec JD |
1571 | } |
1572 | ||
d1d25646 JD |
1573 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1574 | ||
1575 | up_read(&rbd_dev->header_rwsem); | |
1576 | ||
f7760dad AE |
1577 | size = blk_rq_bytes(rq); |
1578 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; | |
1579 | bio = rq->bio; | |
1580 | ||
602adf40 YS |
1581 | dout("%s 0x%x bytes at 0x%llx\n", |
1582 | do_write ? "write" : "read", | |
bd919d45 | 1583 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1584 | |
1fec7093 | 1585 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
df111be6 AE |
1586 | if (num_segs <= 0) { |
1587 | spin_lock_irq(q->queue_lock); | |
1588 | __blk_end_request_all(rq, num_segs); | |
1589 | ceph_put_snap_context(snapc); | |
1590 | continue; | |
1591 | } | |
1fec7093 YS |
1592 | coll = rbd_alloc_coll(num_segs); |
1593 | if (!coll) { | |
1594 | spin_lock_irq(q->queue_lock); | |
1595 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1596 | ceph_put_snap_context(snapc); |
00f1f36f | 1597 | continue; |
1fec7093 YS |
1598 | } |
1599 | ||
f7760dad | 1600 | bio_offset = 0; |
602adf40 | 1601 | do { |
f7760dad AE |
1602 | u64 limit = rbd_segment_length(rbd_dev, ofs, size); |
1603 | unsigned int chain_size; | |
1604 | struct bio *bio_chain; | |
1605 | ||
1606 | BUG_ON(limit > (u64) UINT_MAX); | |
1607 | chain_size = (unsigned int) limit; | |
bd919d45 | 1608 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
f7760dad | 1609 | |
1fec7093 | 1610 | kref_get(&coll->kref); |
f7760dad AE |
1611 | |
1612 | /* Pass a cloned bio chain via an osd request */ | |
1613 | ||
1614 | bio_chain = bio_chain_clone_range(&bio, | |
1615 | &bio_offset, chain_size, | |
1616 | GFP_ATOMIC); | |
1617 | if (bio_chain) | |
4634246d | 1618 | (void) rbd_do_op(rq, rbd_dev, snapc, |
f7760dad AE |
1619 | ofs, chain_size, |
1620 | bio_chain, coll, cur_seg); | |
4634246d | 1621 | else |
1fec7093 | 1622 | rbd_coll_end_req_index(rq, coll, cur_seg, |
f7760dad AE |
1623 | -ENOMEM, chain_size); |
1624 | size -= chain_size; | |
1625 | ofs += chain_size; | |
602adf40 | 1626 | |
1fec7093 | 1627 | cur_seg++; |
602adf40 | 1628 | } while (size > 0); |
1fec7093 | 1629 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 | 1630 | |
602adf40 | 1631 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1632 | |
1633 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1634 | } |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1639 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 1640 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
1641 | */ |
1642 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1643 | struct bio_vec *bvec) | |
1644 | { | |
1645 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
1646 | sector_t sector_offset; |
1647 | sector_t sectors_per_obj; | |
1648 | sector_t obj_sector_offset; | |
1649 | int ret; | |
1650 | ||
1651 | /* | |
1652 | * Find how far into its rbd object the partition-relative | |
1653 | * bio start sector is to offset relative to the enclosing | |
1654 | * device. | |
1655 | */ | |
1656 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
1657 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
1658 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
1659 | ||
1660 | /* | |
1661 | * Compute the number of bytes from that offset to the end | |
1662 | * of the object. Account for what's already used by the bio. | |
1663 | */ | |
1664 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
1665 | if (ret > bmd->bi_size) | |
1666 | ret -= bmd->bi_size; | |
1667 | else | |
1668 | ret = 0; | |
1669 | ||
1670 | /* | |
1671 | * Don't send back more than was asked for. And if the bio | |
1672 | * was empty, let the whole thing through because: "Note | |
1673 | * that a block device *must* allow a single page to be | |
1674 | * added to an empty bio." | |
1675 | */ | |
1676 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
1677 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
1678 | ret = (int) bvec->bv_len; | |
1679 | ||
1680 | return ret; | |
602adf40 YS |
1681 | } |
1682 | ||
1683 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1684 | { | |
1685 | struct gendisk *disk = rbd_dev->disk; | |
1686 | ||
1687 | if (!disk) | |
1688 | return; | |
1689 | ||
602adf40 YS |
1690 | if (disk->flags & GENHD_FL_UP) |
1691 | del_gendisk(disk); | |
1692 | if (disk->queue) | |
1693 | blk_cleanup_queue(disk->queue); | |
1694 | put_disk(disk); | |
1695 | } | |
1696 | ||
1697 | /* | |
4156d998 AE |
1698 | * Read the complete header for the given rbd device. |
1699 | * | |
1700 | * Returns a pointer to a dynamically-allocated buffer containing | |
1701 | * the complete and validated header. Caller can pass the address | |
1702 | * of a variable that will be filled in with the version of the | |
1703 | * header object at the time it was read. | |
1704 | * | |
1705 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1706 | */ |
4156d998 AE |
1707 | static struct rbd_image_header_ondisk * |
1708 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1709 | { |
4156d998 | 1710 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1711 | u32 snap_count = 0; |
4156d998 AE |
1712 | u64 names_size = 0; |
1713 | u32 want_count; | |
1714 | int ret; | |
602adf40 | 1715 | |
00f1f36f | 1716 | /* |
4156d998 AE |
1717 | * The complete header will include an array of its 64-bit |
1718 | * snapshot ids, followed by the names of those snapshots as | |
1719 | * a contiguous block of NUL-terminated strings. Note that | |
1720 | * the number of snapshots could change by the time we read | |
1721 | * it in, in which case we re-read it. | |
00f1f36f | 1722 | */ |
4156d998 AE |
1723 | do { |
1724 | size_t size; | |
1725 | ||
1726 | kfree(ondisk); | |
1727 | ||
1728 | size = sizeof (*ondisk); | |
1729 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1730 | size += names_size; | |
1731 | ondisk = kmalloc(size, GFP_KERNEL); | |
1732 | if (!ondisk) | |
1733 | return ERR_PTR(-ENOMEM); | |
1734 | ||
1735 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1736 | rbd_dev->header_name, |
4156d998 AE |
1737 | 0, size, |
1738 | (char *) ondisk, version); | |
1739 | ||
1740 | if (ret < 0) | |
1741 | goto out_err; | |
1742 | if (WARN_ON((size_t) ret < size)) { | |
1743 | ret = -ENXIO; | |
1744 | pr_warning("short header read for image %s" | |
1745 | " (want %zd got %d)\n", | |
1746 | rbd_dev->image_name, size, ret); | |
1747 | goto out_err; | |
1748 | } | |
1749 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1750 | ret = -ENXIO; | |
1751 | pr_warning("invalid header for image %s\n", | |
1752 | rbd_dev->image_name); | |
1753 | goto out_err; | |
81e759fb | 1754 | } |
602adf40 | 1755 | |
4156d998 AE |
1756 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1757 | want_count = snap_count; | |
1758 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1759 | } while (snap_count != want_count); | |
00f1f36f | 1760 | |
4156d998 | 1761 | return ondisk; |
00f1f36f | 1762 | |
4156d998 AE |
1763 | out_err: |
1764 | kfree(ondisk); | |
1765 | ||
1766 | return ERR_PTR(ret); | |
1767 | } | |
1768 | ||
1769 | /* | |
1770 | * reload the ondisk the header | |
1771 | */ | |
1772 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1773 | struct rbd_image_header *header) | |
1774 | { | |
1775 | struct rbd_image_header_ondisk *ondisk; | |
1776 | u64 ver = 0; | |
1777 | int ret; | |
602adf40 | 1778 | |
4156d998 AE |
1779 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1780 | if (IS_ERR(ondisk)) | |
1781 | return PTR_ERR(ondisk); | |
1782 | ret = rbd_header_from_disk(header, ondisk); | |
1783 | if (ret >= 0) | |
1784 | header->obj_version = ver; | |
1785 | kfree(ondisk); | |
1786 | ||
1787 | return ret; | |
602adf40 YS |
1788 | } |
1789 | ||
41f38c2b | 1790 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
1791 | { |
1792 | struct rbd_snap *snap; | |
a0593290 | 1793 | struct rbd_snap *next; |
dfc5606d | 1794 | |
a0593290 | 1795 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
41f38c2b | 1796 | rbd_remove_snap_dev(snap); |
dfc5606d YS |
1797 | } |
1798 | ||
9478554a AE |
1799 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
1800 | { | |
1801 | sector_t size; | |
1802 | ||
971f839a | 1803 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
9478554a AE |
1804 | return; |
1805 | ||
1806 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
1807 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1808 | rbd_dev->mapping.size = (u64) size; | |
1809 | set_capacity(rbd_dev->disk, size); | |
1810 | } | |
1811 | ||
602adf40 YS |
1812 | /* |
1813 | * only read the first part of the ondisk header, without the snaps info | |
1814 | */ | |
117973fb | 1815 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1816 | { |
1817 | int ret; | |
1818 | struct rbd_image_header h; | |
602adf40 YS |
1819 | |
1820 | ret = rbd_read_header(rbd_dev, &h); | |
1821 | if (ret < 0) | |
1822 | return ret; | |
1823 | ||
a51aa0c0 JD |
1824 | down_write(&rbd_dev->header_rwsem); |
1825 | ||
9478554a AE |
1826 | /* Update image size, and check for resize of mapped image */ |
1827 | rbd_dev->header.image_size = h.image_size; | |
1828 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 1829 | |
849b4260 | 1830 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1831 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1832 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1833 | /* osd requests may still refer to snapc */ |
1834 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1835 | |
b813623a AE |
1836 | if (hver) |
1837 | *hver = h.obj_version; | |
a71b891b | 1838 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1839 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1840 | rbd_dev->header.snapc = h.snapc; |
1841 | rbd_dev->header.snap_names = h.snap_names; | |
1842 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1843 | /* Free the extra copy of the object prefix */ |
1844 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1845 | kfree(h.object_prefix); | |
1846 | ||
304f6808 AE |
1847 | ret = rbd_dev_snaps_update(rbd_dev); |
1848 | if (!ret) | |
1849 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 1850 | |
c666601a | 1851 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1852 | |
dfc5606d | 1853 | return ret; |
602adf40 YS |
1854 | } |
1855 | ||
117973fb | 1856 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
1fe5e993 AE |
1857 | { |
1858 | int ret; | |
1859 | ||
117973fb | 1860 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1fe5e993 | 1861 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb AE |
1862 | if (rbd_dev->image_format == 1) |
1863 | ret = rbd_dev_v1_refresh(rbd_dev, hver); | |
1864 | else | |
1865 | ret = rbd_dev_v2_refresh(rbd_dev, hver); | |
1fe5e993 AE |
1866 | mutex_unlock(&ctl_mutex); |
1867 | ||
1868 | return ret; | |
1869 | } | |
1870 | ||
602adf40 YS |
1871 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1872 | { | |
1873 | struct gendisk *disk; | |
1874 | struct request_queue *q; | |
593a9e7b | 1875 | u64 segment_size; |
602adf40 | 1876 | |
602adf40 | 1877 | /* create gendisk info */ |
602adf40 YS |
1878 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
1879 | if (!disk) | |
1fcdb8aa | 1880 | return -ENOMEM; |
602adf40 | 1881 | |
f0f8cef5 | 1882 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1883 | rbd_dev->dev_id); |
602adf40 YS |
1884 | disk->major = rbd_dev->major; |
1885 | disk->first_minor = 0; | |
1886 | disk->fops = &rbd_bd_ops; | |
1887 | disk->private_data = rbd_dev; | |
1888 | ||
1889 | /* init rq */ | |
602adf40 YS |
1890 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
1891 | if (!q) | |
1892 | goto out_disk; | |
029bcbd8 | 1893 | |
593a9e7b AE |
1894 | /* We use the default size, but let's be explicit about it. */ |
1895 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1896 | ||
029bcbd8 | 1897 | /* set io sizes to object size */ |
593a9e7b AE |
1898 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1899 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1900 | blk_queue_max_segment_size(q, segment_size); | |
1901 | blk_queue_io_min(q, segment_size); | |
1902 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1903 | |
602adf40 YS |
1904 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1905 | disk->queue = q; | |
1906 | ||
1907 | q->queuedata = rbd_dev; | |
1908 | ||
1909 | rbd_dev->disk = disk; | |
602adf40 | 1910 | |
12f02944 AE |
1911 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
1912 | ||
602adf40 | 1913 | return 0; |
602adf40 YS |
1914 | out_disk: |
1915 | put_disk(disk); | |
1fcdb8aa AE |
1916 | |
1917 | return -ENOMEM; | |
602adf40 YS |
1918 | } |
1919 | ||
dfc5606d YS |
1920 | /* |
1921 | sysfs | |
1922 | */ | |
1923 | ||
593a9e7b AE |
1924 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1925 | { | |
1926 | return container_of(dev, struct rbd_device, dev); | |
1927 | } | |
1928 | ||
dfc5606d YS |
1929 | static ssize_t rbd_size_show(struct device *dev, |
1930 | struct device_attribute *attr, char *buf) | |
1931 | { | |
593a9e7b | 1932 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1933 | sector_t size; |
1934 | ||
1935 | down_read(&rbd_dev->header_rwsem); | |
1936 | size = get_capacity(rbd_dev->disk); | |
1937 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1938 | |
a51aa0c0 | 1939 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1940 | } |
1941 | ||
34b13184 AE |
1942 | /* |
1943 | * Note this shows the features for whatever's mapped, which is not | |
1944 | * necessarily the base image. | |
1945 | */ | |
1946 | static ssize_t rbd_features_show(struct device *dev, | |
1947 | struct device_attribute *attr, char *buf) | |
1948 | { | |
1949 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1950 | ||
1951 | return sprintf(buf, "0x%016llx\n", | |
1952 | (unsigned long long) rbd_dev->mapping.features); | |
1953 | } | |
1954 | ||
dfc5606d YS |
1955 | static ssize_t rbd_major_show(struct device *dev, |
1956 | struct device_attribute *attr, char *buf) | |
1957 | { | |
593a9e7b | 1958 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1959 | |
dfc5606d YS |
1960 | return sprintf(buf, "%d\n", rbd_dev->major); |
1961 | } | |
1962 | ||
1963 | static ssize_t rbd_client_id_show(struct device *dev, | |
1964 | struct device_attribute *attr, char *buf) | |
602adf40 | 1965 | { |
593a9e7b | 1966 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1967 | |
1dbb4399 AE |
1968 | return sprintf(buf, "client%lld\n", |
1969 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1970 | } |
1971 | ||
dfc5606d YS |
1972 | static ssize_t rbd_pool_show(struct device *dev, |
1973 | struct device_attribute *attr, char *buf) | |
602adf40 | 1974 | { |
593a9e7b | 1975 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1976 | |
1977 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1978 | } | |
1979 | ||
9bb2f334 AE |
1980 | static ssize_t rbd_pool_id_show(struct device *dev, |
1981 | struct device_attribute *attr, char *buf) | |
1982 | { | |
1983 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1984 | ||
86992098 | 1985 | return sprintf(buf, "%llu\n", (unsigned long long) rbd_dev->pool_id); |
9bb2f334 AE |
1986 | } |
1987 | ||
dfc5606d YS |
1988 | static ssize_t rbd_name_show(struct device *dev, |
1989 | struct device_attribute *attr, char *buf) | |
1990 | { | |
593a9e7b | 1991 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1992 | |
0bed54dc | 1993 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1994 | } |
1995 | ||
589d30e0 AE |
1996 | static ssize_t rbd_image_id_show(struct device *dev, |
1997 | struct device_attribute *attr, char *buf) | |
1998 | { | |
1999 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2000 | ||
2001 | return sprintf(buf, "%s\n", rbd_dev->image_id); | |
2002 | } | |
2003 | ||
34b13184 AE |
2004 | /* |
2005 | * Shows the name of the currently-mapped snapshot (or | |
2006 | * RBD_SNAP_HEAD_NAME for the base image). | |
2007 | */ | |
dfc5606d YS |
2008 | static ssize_t rbd_snap_show(struct device *dev, |
2009 | struct device_attribute *attr, | |
2010 | char *buf) | |
2011 | { | |
593a9e7b | 2012 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2013 | |
971f839a | 2014 | return sprintf(buf, "%s\n", rbd_dev->snap_name); |
dfc5606d YS |
2015 | } |
2016 | ||
2017 | static ssize_t rbd_image_refresh(struct device *dev, | |
2018 | struct device_attribute *attr, | |
2019 | const char *buf, | |
2020 | size_t size) | |
2021 | { | |
593a9e7b | 2022 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 2023 | int ret; |
602adf40 | 2024 | |
117973fb | 2025 | ret = rbd_dev_refresh(rbd_dev, NULL); |
b813623a AE |
2026 | |
2027 | return ret < 0 ? ret : size; | |
dfc5606d | 2028 | } |
602adf40 | 2029 | |
dfc5606d | 2030 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 2031 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
2032 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
2033 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
2034 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 2035 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 2036 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 2037 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
2038 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
2039 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
dfc5606d YS |
2040 | |
2041 | static struct attribute *rbd_attrs[] = { | |
2042 | &dev_attr_size.attr, | |
34b13184 | 2043 | &dev_attr_features.attr, |
dfc5606d YS |
2044 | &dev_attr_major.attr, |
2045 | &dev_attr_client_id.attr, | |
2046 | &dev_attr_pool.attr, | |
9bb2f334 | 2047 | &dev_attr_pool_id.attr, |
dfc5606d | 2048 | &dev_attr_name.attr, |
589d30e0 | 2049 | &dev_attr_image_id.attr, |
dfc5606d YS |
2050 | &dev_attr_current_snap.attr, |
2051 | &dev_attr_refresh.attr, | |
dfc5606d YS |
2052 | NULL |
2053 | }; | |
2054 | ||
2055 | static struct attribute_group rbd_attr_group = { | |
2056 | .attrs = rbd_attrs, | |
2057 | }; | |
2058 | ||
2059 | static const struct attribute_group *rbd_attr_groups[] = { | |
2060 | &rbd_attr_group, | |
2061 | NULL | |
2062 | }; | |
2063 | ||
2064 | static void rbd_sysfs_dev_release(struct device *dev) | |
2065 | { | |
2066 | } | |
2067 | ||
2068 | static struct device_type rbd_device_type = { | |
2069 | .name = "rbd", | |
2070 | .groups = rbd_attr_groups, | |
2071 | .release = rbd_sysfs_dev_release, | |
2072 | }; | |
2073 | ||
2074 | ||
2075 | /* | |
2076 | sysfs - snapshots | |
2077 | */ | |
2078 | ||
2079 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2080 | struct device_attribute *attr, | |
2081 | char *buf) | |
2082 | { | |
2083 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2084 | ||
3591538f | 2085 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2086 | } |
2087 | ||
2088 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2089 | struct device_attribute *attr, | |
2090 | char *buf) | |
2091 | { | |
2092 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2093 | ||
3591538f | 2094 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2095 | } |
2096 | ||
34b13184 AE |
2097 | static ssize_t rbd_snap_features_show(struct device *dev, |
2098 | struct device_attribute *attr, | |
2099 | char *buf) | |
2100 | { | |
2101 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2102 | ||
2103 | return sprintf(buf, "0x%016llx\n", | |
2104 | (unsigned long long) snap->features); | |
2105 | } | |
2106 | ||
dfc5606d YS |
2107 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2108 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 2109 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
2110 | |
2111 | static struct attribute *rbd_snap_attrs[] = { | |
2112 | &dev_attr_snap_size.attr, | |
2113 | &dev_attr_snap_id.attr, | |
34b13184 | 2114 | &dev_attr_snap_features.attr, |
dfc5606d YS |
2115 | NULL, |
2116 | }; | |
2117 | ||
2118 | static struct attribute_group rbd_snap_attr_group = { | |
2119 | .attrs = rbd_snap_attrs, | |
2120 | }; | |
2121 | ||
2122 | static void rbd_snap_dev_release(struct device *dev) | |
2123 | { | |
2124 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2125 | kfree(snap->name); | |
2126 | kfree(snap); | |
2127 | } | |
2128 | ||
2129 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2130 | &rbd_snap_attr_group, | |
2131 | NULL | |
2132 | }; | |
2133 | ||
2134 | static struct device_type rbd_snap_device_type = { | |
2135 | .groups = rbd_snap_attr_groups, | |
2136 | .release = rbd_snap_dev_release, | |
2137 | }; | |
2138 | ||
304f6808 AE |
2139 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2140 | { | |
2141 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
2142 | bool reg = device_is_registered(&snap->dev); | |
2143 | ||
2144 | rbd_assert(!ret ^ reg); | |
2145 | ||
2146 | return ret; | |
2147 | } | |
2148 | ||
41f38c2b | 2149 | static void rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2150 | { |
2151 | list_del(&snap->node); | |
304f6808 AE |
2152 | if (device_is_registered(&snap->dev)) |
2153 | device_unregister(&snap->dev); | |
dfc5606d YS |
2154 | } |
2155 | ||
14e7085d | 2156 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2157 | struct device *parent) |
2158 | { | |
2159 | struct device *dev = &snap->dev; | |
2160 | int ret; | |
2161 | ||
2162 | dev->type = &rbd_snap_device_type; | |
2163 | dev->parent = parent; | |
2164 | dev->release = rbd_snap_dev_release; | |
d4b125e9 | 2165 | dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); |
304f6808 AE |
2166 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2167 | ||
dfc5606d YS |
2168 | ret = device_register(dev); |
2169 | ||
2170 | return ret; | |
2171 | } | |
2172 | ||
4e891e0a | 2173 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 2174 | const char *snap_name, |
34b13184 AE |
2175 | u64 snap_id, u64 snap_size, |
2176 | u64 snap_features) | |
dfc5606d | 2177 | { |
4e891e0a | 2178 | struct rbd_snap *snap; |
dfc5606d | 2179 | int ret; |
4e891e0a AE |
2180 | |
2181 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2182 | if (!snap) |
4e891e0a AE |
2183 | return ERR_PTR(-ENOMEM); |
2184 | ||
2185 | ret = -ENOMEM; | |
c8d18425 | 2186 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
2187 | if (!snap->name) |
2188 | goto err; | |
2189 | ||
c8d18425 AE |
2190 | snap->id = snap_id; |
2191 | snap->size = snap_size; | |
34b13184 | 2192 | snap->features = snap_features; |
4e891e0a AE |
2193 | |
2194 | return snap; | |
2195 | ||
dfc5606d YS |
2196 | err: |
2197 | kfree(snap->name); | |
2198 | kfree(snap); | |
4e891e0a AE |
2199 | |
2200 | return ERR_PTR(ret); | |
dfc5606d YS |
2201 | } |
2202 | ||
cd892126 AE |
2203 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2204 | u64 *snap_size, u64 *snap_features) | |
2205 | { | |
2206 | char *snap_name; | |
2207 | ||
2208 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
2209 | ||
2210 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
2211 | *snap_features = 0; /* No features for v1 */ | |
2212 | ||
2213 | /* Skip over names until we find the one we are looking for */ | |
2214 | ||
2215 | snap_name = rbd_dev->header.snap_names; | |
2216 | while (which--) | |
2217 | snap_name += strlen(snap_name) + 1; | |
2218 | ||
2219 | return snap_name; | |
2220 | } | |
2221 | ||
9d475de5 AE |
2222 | /* |
2223 | * Get the size and object order for an image snapshot, or if | |
2224 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
2225 | * image. | |
2226 | */ | |
2227 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
2228 | u8 *order, u64 *snap_size) | |
2229 | { | |
2230 | __le64 snapid = cpu_to_le64(snap_id); | |
2231 | int ret; | |
2232 | struct { | |
2233 | u8 order; | |
2234 | __le64 size; | |
2235 | } __attribute__ ((packed)) size_buf = { 0 }; | |
2236 | ||
2237 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2238 | "rbd", "get_size", | |
2239 | (char *) &snapid, sizeof (snapid), | |
2240 | (char *) &size_buf, sizeof (size_buf), | |
2241 | CEPH_OSD_FLAG_READ, NULL); | |
2242 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2243 | if (ret < 0) | |
2244 | return ret; | |
2245 | ||
2246 | *order = size_buf.order; | |
2247 | *snap_size = le64_to_cpu(size_buf.size); | |
2248 | ||
2249 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
2250 | (unsigned long long) snap_id, (unsigned int) *order, | |
2251 | (unsigned long long) *snap_size); | |
2252 | ||
2253 | return 0; | |
2254 | } | |
2255 | ||
2256 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
2257 | { | |
2258 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
2259 | &rbd_dev->header.obj_order, | |
2260 | &rbd_dev->header.image_size); | |
2261 | } | |
2262 | ||
1e130199 AE |
2263 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2264 | { | |
2265 | void *reply_buf; | |
2266 | int ret; | |
2267 | void *p; | |
2268 | ||
2269 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
2270 | if (!reply_buf) | |
2271 | return -ENOMEM; | |
2272 | ||
2273 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2274 | "rbd", "get_object_prefix", | |
2275 | NULL, 0, | |
2276 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, | |
2277 | CEPH_OSD_FLAG_READ, NULL); | |
2278 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2279 | if (ret < 0) | |
2280 | goto out; | |
a0ea3a40 | 2281 | ret = 0; /* rbd_req_sync_exec() can return positive */ |
1e130199 AE |
2282 | |
2283 | p = reply_buf; | |
2284 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
2285 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
2286 | NULL, GFP_NOIO); | |
2287 | ||
2288 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
2289 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
2290 | rbd_dev->header.object_prefix = NULL; | |
2291 | } else { | |
2292 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
2293 | } | |
2294 | ||
2295 | out: | |
2296 | kfree(reply_buf); | |
2297 | ||
2298 | return ret; | |
2299 | } | |
2300 | ||
b1b5402a AE |
2301 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2302 | u64 *snap_features) | |
2303 | { | |
2304 | __le64 snapid = cpu_to_le64(snap_id); | |
2305 | struct { | |
2306 | __le64 features; | |
2307 | __le64 incompat; | |
2308 | } features_buf = { 0 }; | |
d889140c | 2309 | u64 incompat; |
b1b5402a AE |
2310 | int ret; |
2311 | ||
2312 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2313 | "rbd", "get_features", | |
2314 | (char *) &snapid, sizeof (snapid), | |
2315 | (char *) &features_buf, sizeof (features_buf), | |
2316 | CEPH_OSD_FLAG_READ, NULL); | |
2317 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2318 | if (ret < 0) | |
2319 | return ret; | |
d889140c AE |
2320 | |
2321 | incompat = le64_to_cpu(features_buf.incompat); | |
2322 | if (incompat & ~RBD_FEATURES_ALL) | |
2323 | return -ENOTSUPP; | |
2324 | ||
b1b5402a AE |
2325 | *snap_features = le64_to_cpu(features_buf.features); |
2326 | ||
2327 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
2328 | (unsigned long long) snap_id, | |
2329 | (unsigned long long) *snap_features, | |
2330 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
2331 | ||
2332 | return 0; | |
2333 | } | |
2334 | ||
2335 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
2336 | { | |
2337 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
2338 | &rbd_dev->header.features); | |
2339 | } | |
2340 | ||
6e14b1a6 | 2341 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
2342 | { |
2343 | size_t size; | |
2344 | int ret; | |
2345 | void *reply_buf; | |
2346 | void *p; | |
2347 | void *end; | |
2348 | u64 seq; | |
2349 | u32 snap_count; | |
2350 | struct ceph_snap_context *snapc; | |
2351 | u32 i; | |
2352 | ||
2353 | /* | |
2354 | * We'll need room for the seq value (maximum snapshot id), | |
2355 | * snapshot count, and array of that many snapshot ids. | |
2356 | * For now we have a fixed upper limit on the number we're | |
2357 | * prepared to receive. | |
2358 | */ | |
2359 | size = sizeof (__le64) + sizeof (__le32) + | |
2360 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
2361 | reply_buf = kzalloc(size, GFP_KERNEL); | |
2362 | if (!reply_buf) | |
2363 | return -ENOMEM; | |
2364 | ||
2365 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2366 | "rbd", "get_snapcontext", | |
2367 | NULL, 0, | |
2368 | reply_buf, size, | |
6e14b1a6 | 2369 | CEPH_OSD_FLAG_READ, ver); |
35d489f9 AE |
2370 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); |
2371 | if (ret < 0) | |
2372 | goto out; | |
2373 | ||
2374 | ret = -ERANGE; | |
2375 | p = reply_buf; | |
2376 | end = (char *) reply_buf + size; | |
2377 | ceph_decode_64_safe(&p, end, seq, out); | |
2378 | ceph_decode_32_safe(&p, end, snap_count, out); | |
2379 | ||
2380 | /* | |
2381 | * Make sure the reported number of snapshot ids wouldn't go | |
2382 | * beyond the end of our buffer. But before checking that, | |
2383 | * make sure the computed size of the snapshot context we | |
2384 | * allocate is representable in a size_t. | |
2385 | */ | |
2386 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
2387 | / sizeof (u64)) { | |
2388 | ret = -EINVAL; | |
2389 | goto out; | |
2390 | } | |
2391 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
2392 | goto out; | |
2393 | ||
2394 | size = sizeof (struct ceph_snap_context) + | |
2395 | snap_count * sizeof (snapc->snaps[0]); | |
2396 | snapc = kmalloc(size, GFP_KERNEL); | |
2397 | if (!snapc) { | |
2398 | ret = -ENOMEM; | |
2399 | goto out; | |
2400 | } | |
2401 | ||
2402 | atomic_set(&snapc->nref, 1); | |
2403 | snapc->seq = seq; | |
2404 | snapc->num_snaps = snap_count; | |
2405 | for (i = 0; i < snap_count; i++) | |
2406 | snapc->snaps[i] = ceph_decode_64(&p); | |
2407 | ||
2408 | rbd_dev->header.snapc = snapc; | |
2409 | ||
2410 | dout(" snap context seq = %llu, snap_count = %u\n", | |
2411 | (unsigned long long) seq, (unsigned int) snap_count); | |
2412 | ||
2413 | out: | |
2414 | kfree(reply_buf); | |
2415 | ||
2416 | return 0; | |
2417 | } | |
2418 | ||
b8b1e2db AE |
2419 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
2420 | { | |
2421 | size_t size; | |
2422 | void *reply_buf; | |
2423 | __le64 snap_id; | |
2424 | int ret; | |
2425 | void *p; | |
2426 | void *end; | |
2427 | size_t snap_name_len; | |
2428 | char *snap_name; | |
2429 | ||
2430 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
2431 | reply_buf = kmalloc(size, GFP_KERNEL); | |
2432 | if (!reply_buf) | |
2433 | return ERR_PTR(-ENOMEM); | |
2434 | ||
2435 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
2436 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2437 | "rbd", "get_snapshot_name", | |
2438 | (char *) &snap_id, sizeof (snap_id), | |
2439 | reply_buf, size, | |
2440 | CEPH_OSD_FLAG_READ, NULL); | |
2441 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2442 | if (ret < 0) | |
2443 | goto out; | |
2444 | ||
2445 | p = reply_buf; | |
2446 | end = (char *) reply_buf + size; | |
2447 | snap_name_len = 0; | |
2448 | snap_name = ceph_extract_encoded_string(&p, end, &snap_name_len, | |
2449 | GFP_KERNEL); | |
2450 | if (IS_ERR(snap_name)) { | |
2451 | ret = PTR_ERR(snap_name); | |
2452 | goto out; | |
2453 | } else { | |
2454 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
2455 | (unsigned long long) le64_to_cpu(snap_id), snap_name); | |
2456 | } | |
2457 | kfree(reply_buf); | |
2458 | ||
2459 | return snap_name; | |
2460 | out: | |
2461 | kfree(reply_buf); | |
2462 | ||
2463 | return ERR_PTR(ret); | |
2464 | } | |
2465 | ||
2466 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2467 | u64 *snap_size, u64 *snap_features) | |
2468 | { | |
2469 | __le64 snap_id; | |
2470 | u8 order; | |
2471 | int ret; | |
2472 | ||
2473 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
2474 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
2475 | if (ret) | |
2476 | return ERR_PTR(ret); | |
2477 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
2478 | if (ret) | |
2479 | return ERR_PTR(ret); | |
2480 | ||
2481 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
2482 | } | |
2483 | ||
2484 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2485 | u64 *snap_size, u64 *snap_features) | |
2486 | { | |
2487 | if (rbd_dev->image_format == 1) | |
2488 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
2489 | snap_size, snap_features); | |
2490 | if (rbd_dev->image_format == 2) | |
2491 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
2492 | snap_size, snap_features); | |
2493 | return ERR_PTR(-EINVAL); | |
2494 | } | |
2495 | ||
117973fb AE |
2496 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
2497 | { | |
2498 | int ret; | |
2499 | __u8 obj_order; | |
2500 | ||
2501 | down_write(&rbd_dev->header_rwsem); | |
2502 | ||
2503 | /* Grab old order first, to see if it changes */ | |
2504 | ||
2505 | obj_order = rbd_dev->header.obj_order, | |
2506 | ret = rbd_dev_v2_image_size(rbd_dev); | |
2507 | if (ret) | |
2508 | goto out; | |
2509 | if (rbd_dev->header.obj_order != obj_order) { | |
2510 | ret = -EIO; | |
2511 | goto out; | |
2512 | } | |
2513 | rbd_update_mapping_size(rbd_dev); | |
2514 | ||
2515 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); | |
2516 | dout("rbd_dev_v2_snap_context returned %d\n", ret); | |
2517 | if (ret) | |
2518 | goto out; | |
2519 | ret = rbd_dev_snaps_update(rbd_dev); | |
2520 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
2521 | if (ret) | |
2522 | goto out; | |
2523 | ret = rbd_dev_snaps_register(rbd_dev); | |
2524 | dout("rbd_dev_snaps_register returned %d\n", ret); | |
2525 | out: | |
2526 | up_write(&rbd_dev->header_rwsem); | |
2527 | ||
2528 | return ret; | |
2529 | } | |
2530 | ||
dfc5606d | 2531 | /* |
35938150 AE |
2532 | * Scan the rbd device's current snapshot list and compare it to the |
2533 | * newly-received snapshot context. Remove any existing snapshots | |
2534 | * not present in the new snapshot context. Add a new snapshot for | |
2535 | * any snaphots in the snapshot context not in the current list. | |
2536 | * And verify there are no changes to snapshots we already know | |
2537 | * about. | |
2538 | * | |
2539 | * Assumes the snapshots in the snapshot context are sorted by | |
2540 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2541 | * are also maintained in that order.) | |
dfc5606d | 2542 | */ |
304f6808 | 2543 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 2544 | { |
35938150 AE |
2545 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2546 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
2547 | struct list_head *head = &rbd_dev->snaps; |
2548 | struct list_head *links = head->next; | |
2549 | u32 index = 0; | |
dfc5606d | 2550 | |
9fcbb800 | 2551 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
2552 | while (index < snap_count || links != head) { |
2553 | u64 snap_id; | |
2554 | struct rbd_snap *snap; | |
cd892126 AE |
2555 | char *snap_name; |
2556 | u64 snap_size = 0; | |
2557 | u64 snap_features = 0; | |
dfc5606d | 2558 | |
35938150 AE |
2559 | snap_id = index < snap_count ? snapc->snaps[index] |
2560 | : CEPH_NOSNAP; | |
2561 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2562 | : NULL; | |
aafb230e | 2563 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 2564 | |
35938150 AE |
2565 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2566 | struct list_head *next = links->next; | |
dfc5606d | 2567 | |
35938150 | 2568 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2569 | |
971f839a | 2570 | if (rbd_dev->snap_id == snap->id) |
daba5fdb | 2571 | rbd_dev->exists = false; |
41f38c2b | 2572 | rbd_remove_snap_dev(snap); |
9fcbb800 | 2573 | dout("%ssnap id %llu has been removed\n", |
971f839a | 2574 | rbd_dev->snap_id == snap->id ? "mapped " : "", |
9fcbb800 | 2575 | (unsigned long long) snap->id); |
35938150 AE |
2576 | |
2577 | /* Done with this list entry; advance */ | |
2578 | ||
2579 | links = next; | |
dfc5606d YS |
2580 | continue; |
2581 | } | |
35938150 | 2582 | |
b8b1e2db AE |
2583 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
2584 | &snap_size, &snap_features); | |
cd892126 AE |
2585 | if (IS_ERR(snap_name)) |
2586 | return PTR_ERR(snap_name); | |
2587 | ||
9fcbb800 AE |
2588 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
2589 | (unsigned long long) snap_id); | |
35938150 AE |
2590 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
2591 | struct rbd_snap *new_snap; | |
2592 | ||
2593 | /* We haven't seen this snapshot before */ | |
2594 | ||
c8d18425 | 2595 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 2596 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
2597 | if (IS_ERR(new_snap)) { |
2598 | int err = PTR_ERR(new_snap); | |
2599 | ||
2600 | dout(" failed to add dev, error %d\n", err); | |
2601 | ||
2602 | return err; | |
2603 | } | |
35938150 AE |
2604 | |
2605 | /* New goes before existing, or at end of list */ | |
2606 | ||
9fcbb800 | 2607 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
2608 | if (snap) |
2609 | list_add_tail(&new_snap->node, &snap->node); | |
2610 | else | |
523f3258 | 2611 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2612 | } else { |
2613 | /* Already have this one */ | |
2614 | ||
9fcbb800 AE |
2615 | dout(" already present\n"); |
2616 | ||
cd892126 | 2617 | rbd_assert(snap->size == snap_size); |
aafb230e | 2618 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 2619 | rbd_assert(snap->features == snap_features); |
35938150 AE |
2620 | |
2621 | /* Done with this list entry; advance */ | |
2622 | ||
2623 | links = links->next; | |
dfc5606d | 2624 | } |
35938150 AE |
2625 | |
2626 | /* Advance to the next entry in the snapshot context */ | |
2627 | ||
2628 | index++; | |
dfc5606d | 2629 | } |
9fcbb800 | 2630 | dout("%s: done\n", __func__); |
dfc5606d YS |
2631 | |
2632 | return 0; | |
2633 | } | |
2634 | ||
304f6808 AE |
2635 | /* |
2636 | * Scan the list of snapshots and register the devices for any that | |
2637 | * have not already been registered. | |
2638 | */ | |
2639 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
2640 | { | |
2641 | struct rbd_snap *snap; | |
2642 | int ret = 0; | |
2643 | ||
2644 | dout("%s called\n", __func__); | |
86ff77bb AE |
2645 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
2646 | return -EIO; | |
304f6808 AE |
2647 | |
2648 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2649 | if (!rbd_snap_registered(snap)) { | |
2650 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
2651 | if (ret < 0) | |
2652 | break; | |
2653 | } | |
2654 | } | |
2655 | dout("%s: returning %d\n", __func__, ret); | |
2656 | ||
2657 | return ret; | |
2658 | } | |
2659 | ||
dfc5606d YS |
2660 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2661 | { | |
dfc5606d | 2662 | struct device *dev; |
cd789ab9 | 2663 | int ret; |
dfc5606d YS |
2664 | |
2665 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 2666 | |
cd789ab9 | 2667 | dev = &rbd_dev->dev; |
dfc5606d YS |
2668 | dev->bus = &rbd_bus_type; |
2669 | dev->type = &rbd_device_type; | |
2670 | dev->parent = &rbd_root_dev; | |
2671 | dev->release = rbd_dev_release; | |
de71a297 | 2672 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 2673 | ret = device_register(dev); |
dfc5606d | 2674 | |
dfc5606d | 2675 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 2676 | |
dfc5606d | 2677 | return ret; |
602adf40 YS |
2678 | } |
2679 | ||
dfc5606d YS |
2680 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2681 | { | |
2682 | device_unregister(&rbd_dev->dev); | |
2683 | } | |
2684 | ||
59c2be1e YS |
2685 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2686 | { | |
2687 | int ret, rc; | |
2688 | ||
2689 | do { | |
0e6f322d | 2690 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2691 | if (ret == -ERANGE) { |
117973fb | 2692 | rc = rbd_dev_refresh(rbd_dev, NULL); |
59c2be1e YS |
2693 | if (rc < 0) |
2694 | return rc; | |
2695 | } | |
2696 | } while (ret == -ERANGE); | |
2697 | ||
2698 | return ret; | |
2699 | } | |
2700 | ||
e2839308 | 2701 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
2702 | |
2703 | /* | |
499afd5b AE |
2704 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2705 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2706 | */ |
e2839308 | 2707 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2708 | { |
e2839308 | 2709 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
2710 | |
2711 | spin_lock(&rbd_dev_list_lock); | |
2712 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2713 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
2714 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
2715 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 2716 | } |
b7f23c36 | 2717 | |
1ddbe94e | 2718 | /* |
499afd5b AE |
2719 | * Remove an rbd_dev from the global list, and record that its |
2720 | * identifier is no longer in use. | |
1ddbe94e | 2721 | */ |
e2839308 | 2722 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2723 | { |
d184f6bf | 2724 | struct list_head *tmp; |
de71a297 | 2725 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2726 | int max_id; |
2727 | ||
aafb230e | 2728 | rbd_assert(rbd_id > 0); |
499afd5b | 2729 | |
e2839308 AE |
2730 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
2731 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
2732 | spin_lock(&rbd_dev_list_lock); |
2733 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2734 | |
2735 | /* | |
2736 | * If the id being "put" is not the current maximum, there | |
2737 | * is nothing special we need to do. | |
2738 | */ | |
e2839308 | 2739 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
2740 | spin_unlock(&rbd_dev_list_lock); |
2741 | return; | |
2742 | } | |
2743 | ||
2744 | /* | |
2745 | * We need to update the current maximum id. Search the | |
2746 | * list to find out what it is. We're more likely to find | |
2747 | * the maximum at the end, so search the list backward. | |
2748 | */ | |
2749 | max_id = 0; | |
2750 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2751 | struct rbd_device *rbd_dev; | |
2752 | ||
2753 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
2754 | if (rbd_dev->dev_id > max_id) |
2755 | max_id = rbd_dev->dev_id; | |
d184f6bf | 2756 | } |
499afd5b | 2757 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2758 | |
1ddbe94e | 2759 | /* |
e2839308 | 2760 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
2761 | * which case it now accurately reflects the new maximum. |
2762 | * Be careful not to overwrite the maximum value in that | |
2763 | * case. | |
1ddbe94e | 2764 | */ |
e2839308 AE |
2765 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
2766 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
2767 | } |
2768 | ||
e28fff26 AE |
2769 | /* |
2770 | * Skips over white space at *buf, and updates *buf to point to the | |
2771 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2772 | * the token (string of non-white space characters) found. Note |
2773 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2774 | */ |
2775 | static inline size_t next_token(const char **buf) | |
2776 | { | |
2777 | /* | |
2778 | * These are the characters that produce nonzero for | |
2779 | * isspace() in the "C" and "POSIX" locales. | |
2780 | */ | |
2781 | const char *spaces = " \f\n\r\t\v"; | |
2782 | ||
2783 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2784 | ||
2785 | return strcspn(*buf, spaces); /* Return token length */ | |
2786 | } | |
2787 | ||
2788 | /* | |
2789 | * Finds the next token in *buf, and if the provided token buffer is | |
2790 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2791 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2792 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2793 | * |
2794 | * Returns the length of the token found (not including the '\0'). | |
2795 | * Return value will be 0 if no token is found, and it will be >= | |
2796 | * token_size if the token would not fit. | |
2797 | * | |
593a9e7b | 2798 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2799 | * found token. Note that this occurs even if the token buffer is |
2800 | * too small to hold it. | |
2801 | */ | |
2802 | static inline size_t copy_token(const char **buf, | |
2803 | char *token, | |
2804 | size_t token_size) | |
2805 | { | |
2806 | size_t len; | |
2807 | ||
2808 | len = next_token(buf); | |
2809 | if (len < token_size) { | |
2810 | memcpy(token, *buf, len); | |
2811 | *(token + len) = '\0'; | |
2812 | } | |
2813 | *buf += len; | |
2814 | ||
2815 | return len; | |
2816 | } | |
2817 | ||
ea3352f4 AE |
2818 | /* |
2819 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2820 | * enough to hold a copy of it, and copies the token into the new | |
2821 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2822 | * that a duplicate buffer is created even for a zero-length token. | |
2823 | * | |
2824 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2825 | * pointer if memory for the duplicate was not available. If | |
2826 | * the lenp argument is a non-null pointer, the length of the token | |
2827 | * (not including the '\0') is returned in *lenp. | |
2828 | * | |
2829 | * If successful, the *buf pointer will be updated to point beyond | |
2830 | * the end of the found token. | |
2831 | * | |
2832 | * Note: uses GFP_KERNEL for allocation. | |
2833 | */ | |
2834 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2835 | { | |
2836 | char *dup; | |
2837 | size_t len; | |
2838 | ||
2839 | len = next_token(buf); | |
2840 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2841 | if (!dup) | |
2842 | return NULL; | |
2843 | ||
2844 | memcpy(dup, *buf, len); | |
2845 | *(dup + len) = '\0'; | |
2846 | *buf += len; | |
2847 | ||
2848 | if (lenp) | |
2849 | *lenp = len; | |
2850 | ||
2851 | return dup; | |
2852 | } | |
2853 | ||
a725f65e | 2854 | /* |
3feeb894 AE |
2855 | * This fills in the pool_name, image_name, image_name_len, rbd_dev, |
2856 | * rbd_md_name, and name fields of the given rbd_dev, based on the | |
2857 | * list of monitor addresses and other options provided via | |
2858 | * /sys/bus/rbd/add. Returns a pointer to a dynamically-allocated | |
2859 | * copy of the snapshot name to map if successful, or a | |
2860 | * pointer-coded error otherwise. | |
d22f76e7 AE |
2861 | * |
2862 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e | 2863 | */ |
3feeb894 AE |
2864 | static char *rbd_add_parse_args(struct rbd_device *rbd_dev, |
2865 | const char *buf, | |
2866 | const char **mon_addrs, | |
2867 | size_t *mon_addrs_size, | |
2868 | char *options, | |
2869 | size_t options_size) | |
e28fff26 | 2870 | { |
d22f76e7 | 2871 | size_t len; |
3feeb894 AE |
2872 | char *err_ptr = ERR_PTR(-EINVAL); |
2873 | char *snap_name; | |
e28fff26 AE |
2874 | |
2875 | /* The first four tokens are required */ | |
2876 | ||
7ef3214a AE |
2877 | len = next_token(&buf); |
2878 | if (!len) | |
3feeb894 | 2879 | return err_ptr; |
5214ecc4 | 2880 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2881 | *mon_addrs = buf; |
2882 | ||
2883 | buf += len; | |
a725f65e | 2884 | |
e28fff26 AE |
2885 | len = copy_token(&buf, options, options_size); |
2886 | if (!len || len >= options_size) | |
3feeb894 | 2887 | return err_ptr; |
e28fff26 | 2888 | |
3feeb894 | 2889 | err_ptr = ERR_PTR(-ENOMEM); |
d22f76e7 AE |
2890 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2891 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2892 | goto out_err; |
e28fff26 | 2893 | |
0bed54dc AE |
2894 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2895 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2896 | goto out_err; |
a725f65e | 2897 | |
d4b125e9 AE |
2898 | /* Snapshot name is optional; default is to use "head" */ |
2899 | ||
3feeb894 | 2900 | len = next_token(&buf); |
d4b125e9 AE |
2901 | if (len > RBD_MAX_SNAP_NAME_LEN) { |
2902 | err_ptr = ERR_PTR(-ENAMETOOLONG); | |
2903 | goto out_err; | |
2904 | } | |
820a5f3e | 2905 | if (!len) { |
3feeb894 AE |
2906 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
2907 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
849b4260 | 2908 | } |
3feeb894 AE |
2909 | snap_name = kmalloc(len + 1, GFP_KERNEL); |
2910 | if (!snap_name) | |
2911 | goto out_err; | |
2912 | memcpy(snap_name, buf, len); | |
2913 | *(snap_name + len) = '\0'; | |
e28fff26 | 2914 | |
3feeb894 | 2915 | return snap_name; |
d22f76e7 AE |
2916 | |
2917 | out_err: | |
0bed54dc | 2918 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2919 | rbd_dev->image_name = NULL; |
2920 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2921 | kfree(rbd_dev->pool_name); |
2922 | rbd_dev->pool_name = NULL; | |
2923 | ||
3feeb894 | 2924 | return err_ptr; |
a725f65e AE |
2925 | } |
2926 | ||
589d30e0 AE |
2927 | /* |
2928 | * An rbd format 2 image has a unique identifier, distinct from the | |
2929 | * name given to it by the user. Internally, that identifier is | |
2930 | * what's used to specify the names of objects related to the image. | |
2931 | * | |
2932 | * A special "rbd id" object is used to map an rbd image name to its | |
2933 | * id. If that object doesn't exist, then there is no v2 rbd image | |
2934 | * with the supplied name. | |
2935 | * | |
2936 | * This function will record the given rbd_dev's image_id field if | |
2937 | * it can be determined, and in that case will return 0. If any | |
2938 | * errors occur a negative errno will be returned and the rbd_dev's | |
2939 | * image_id field will be unchanged (and should be NULL). | |
2940 | */ | |
2941 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
2942 | { | |
2943 | int ret; | |
2944 | size_t size; | |
2945 | char *object_name; | |
2946 | void *response; | |
2947 | void *p; | |
2948 | ||
2949 | /* | |
2950 | * First, see if the format 2 image id file exists, and if | |
2951 | * so, get the image's persistent id from it. | |
2952 | */ | |
2953 | size = sizeof (RBD_ID_PREFIX) + rbd_dev->image_name_len; | |
2954 | object_name = kmalloc(size, GFP_NOIO); | |
2955 | if (!object_name) | |
2956 | return -ENOMEM; | |
2957 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->image_name); | |
2958 | dout("rbd id object name is %s\n", object_name); | |
2959 | ||
2960 | /* Response will be an encoded string, which includes a length */ | |
2961 | ||
2962 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
2963 | response = kzalloc(size, GFP_NOIO); | |
2964 | if (!response) { | |
2965 | ret = -ENOMEM; | |
2966 | goto out; | |
2967 | } | |
2968 | ||
2969 | ret = rbd_req_sync_exec(rbd_dev, object_name, | |
2970 | "rbd", "get_id", | |
2971 | NULL, 0, | |
2972 | response, RBD_IMAGE_ID_LEN_MAX, | |
2973 | CEPH_OSD_FLAG_READ, NULL); | |
2974 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2975 | if (ret < 0) | |
2976 | goto out; | |
a0ea3a40 | 2977 | ret = 0; /* rbd_req_sync_exec() can return positive */ |
589d30e0 AE |
2978 | |
2979 | p = response; | |
2980 | rbd_dev->image_id = ceph_extract_encoded_string(&p, | |
2981 | p + RBD_IMAGE_ID_LEN_MAX, | |
2982 | &rbd_dev->image_id_len, | |
2983 | GFP_NOIO); | |
2984 | if (IS_ERR(rbd_dev->image_id)) { | |
2985 | ret = PTR_ERR(rbd_dev->image_id); | |
2986 | rbd_dev->image_id = NULL; | |
2987 | } else { | |
2988 | dout("image_id is %s\n", rbd_dev->image_id); | |
2989 | } | |
2990 | out: | |
2991 | kfree(response); | |
2992 | kfree(object_name); | |
2993 | ||
2994 | return ret; | |
2995 | } | |
2996 | ||
a30b71b9 AE |
2997 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
2998 | { | |
2999 | int ret; | |
3000 | size_t size; | |
3001 | ||
3002 | /* Version 1 images have no id; empty string is used */ | |
3003 | ||
3004 | rbd_dev->image_id = kstrdup("", GFP_KERNEL); | |
3005 | if (!rbd_dev->image_id) | |
3006 | return -ENOMEM; | |
3007 | rbd_dev->image_id_len = 0; | |
3008 | ||
3009 | /* Record the header object name for this rbd image. */ | |
3010 | ||
3011 | size = rbd_dev->image_name_len + sizeof (RBD_SUFFIX); | |
3012 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
3013 | if (!rbd_dev->header_name) { | |
3014 | ret = -ENOMEM; | |
3015 | goto out_err; | |
3016 | } | |
3017 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); | |
3018 | ||
3019 | /* Populate rbd image metadata */ | |
3020 | ||
3021 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
3022 | if (ret < 0) | |
3023 | goto out_err; | |
3024 | rbd_dev->image_format = 1; | |
3025 | ||
3026 | dout("discovered version 1 image, header name is %s\n", | |
3027 | rbd_dev->header_name); | |
3028 | ||
3029 | return 0; | |
3030 | ||
3031 | out_err: | |
3032 | kfree(rbd_dev->header_name); | |
3033 | rbd_dev->header_name = NULL; | |
3034 | kfree(rbd_dev->image_id); | |
3035 | rbd_dev->image_id = NULL; | |
3036 | ||
3037 | return ret; | |
3038 | } | |
3039 | ||
3040 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
3041 | { | |
3042 | size_t size; | |
9d475de5 | 3043 | int ret; |
6e14b1a6 | 3044 | u64 ver = 0; |
a30b71b9 AE |
3045 | |
3046 | /* | |
3047 | * Image id was filled in by the caller. Record the header | |
3048 | * object name for this rbd image. | |
3049 | */ | |
3050 | size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->image_id_len; | |
3051 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
3052 | if (!rbd_dev->header_name) | |
3053 | return -ENOMEM; | |
3054 | sprintf(rbd_dev->header_name, "%s%s", | |
3055 | RBD_HEADER_PREFIX, rbd_dev->image_id); | |
9d475de5 AE |
3056 | |
3057 | /* Get the size and object order for the image */ | |
3058 | ||
3059 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
3060 | if (ret < 0) |
3061 | goto out_err; | |
3062 | ||
3063 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
3064 | ||
3065 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
3066 | if (ret < 0) |
3067 | goto out_err; | |
3068 | ||
d889140c | 3069 | /* Get the and check features for the image */ |
b1b5402a AE |
3070 | |
3071 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
3072 | if (ret < 0) |
3073 | goto out_err; | |
35d489f9 | 3074 | |
6e14b1a6 AE |
3075 | /* crypto and compression type aren't (yet) supported for v2 images */ |
3076 | ||
3077 | rbd_dev->header.crypt_type = 0; | |
3078 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 3079 | |
6e14b1a6 AE |
3080 | /* Get the snapshot context, plus the header version */ |
3081 | ||
3082 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
3083 | if (ret) |
3084 | goto out_err; | |
6e14b1a6 AE |
3085 | rbd_dev->header.obj_version = ver; |
3086 | ||
a30b71b9 AE |
3087 | rbd_dev->image_format = 2; |
3088 | ||
3089 | dout("discovered version 2 image, header name is %s\n", | |
3090 | rbd_dev->header_name); | |
3091 | ||
35152979 | 3092 | return 0; |
9d475de5 AE |
3093 | out_err: |
3094 | kfree(rbd_dev->header_name); | |
3095 | rbd_dev->header_name = NULL; | |
1e130199 AE |
3096 | kfree(rbd_dev->header.object_prefix); |
3097 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
3098 | |
3099 | return ret; | |
a30b71b9 AE |
3100 | } |
3101 | ||
3102 | /* | |
3103 | * Probe for the existence of the header object for the given rbd | |
3104 | * device. For format 2 images this includes determining the image | |
3105 | * id. | |
3106 | */ | |
3107 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
3108 | { | |
3109 | int ret; | |
3110 | ||
3111 | /* | |
3112 | * Get the id from the image id object. If it's not a | |
3113 | * format 2 image, we'll get ENOENT back, and we'll assume | |
3114 | * it's a format 1 image. | |
3115 | */ | |
3116 | ret = rbd_dev_image_id(rbd_dev); | |
3117 | if (ret) | |
3118 | ret = rbd_dev_v1_probe(rbd_dev); | |
3119 | else | |
3120 | ret = rbd_dev_v2_probe(rbd_dev); | |
3121 | if (ret) | |
3122 | dout("probe failed, returning %d\n", ret); | |
3123 | ||
3124 | return ret; | |
3125 | } | |
3126 | ||
59c2be1e YS |
3127 | static ssize_t rbd_add(struct bus_type *bus, |
3128 | const char *buf, | |
3129 | size_t count) | |
602adf40 | 3130 | { |
cb8627c7 AE |
3131 | char *options; |
3132 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
3133 | const char *mon_addrs = NULL; |
3134 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
3135 | struct ceph_osd_client *osdc; |
3136 | int rc = -ENOMEM; | |
3feeb894 | 3137 | char *snap_name; |
602adf40 YS |
3138 | |
3139 | if (!try_module_get(THIS_MODULE)) | |
3140 | return -ENODEV; | |
3141 | ||
60571c7d | 3142 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 3143 | if (!options) |
85ae8926 | 3144 | goto err_out_mem; |
cb8627c7 AE |
3145 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
3146 | if (!rbd_dev) | |
85ae8926 | 3147 | goto err_out_mem; |
602adf40 YS |
3148 | |
3149 | /* static rbd_device initialization */ | |
3150 | spin_lock_init(&rbd_dev->lock); | |
3151 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 3152 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 3153 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 3154 | |
602adf40 | 3155 | /* parse add command */ |
3feeb894 AE |
3156 | snap_name = rbd_add_parse_args(rbd_dev, buf, |
3157 | &mon_addrs, &mon_addrs_size, options, count); | |
3158 | if (IS_ERR(snap_name)) { | |
3159 | rc = PTR_ERR(snap_name); | |
85ae8926 | 3160 | goto err_out_mem; |
3feeb894 | 3161 | } |
e124a82f | 3162 | |
f8c38929 AE |
3163 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
3164 | if (rc < 0) | |
85ae8926 | 3165 | goto err_out_args; |
602adf40 | 3166 | |
602adf40 | 3167 | /* pick the pool */ |
1dbb4399 | 3168 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
3169 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
3170 | if (rc < 0) | |
3171 | goto err_out_client; | |
86992098 | 3172 | rbd_dev->pool_id = (u64) rc; |
602adf40 | 3173 | |
a30b71b9 AE |
3174 | rc = rbd_dev_probe(rbd_dev); |
3175 | if (rc < 0) | |
05fd6f6f AE |
3176 | goto err_out_client; |
3177 | ||
3178 | /* no need to lock here, as rbd_dev is not registered yet */ | |
3179 | rc = rbd_dev_snaps_update(rbd_dev); | |
3180 | if (rc) | |
41f38c2b | 3181 | goto err_out_probe; |
05fd6f6f AE |
3182 | |
3183 | rc = rbd_dev_set_mapping(rbd_dev, snap_name); | |
3184 | if (rc) | |
41f38c2b | 3185 | goto err_out_snaps; |
05fd6f6f | 3186 | |
85ae8926 AE |
3187 | /* generate unique id: find highest unique id, add one */ |
3188 | rbd_dev_id_get(rbd_dev); | |
3189 | ||
3190 | /* Fill in the device name, now that we have its id. */ | |
3191 | BUILD_BUG_ON(DEV_NAME_LEN | |
3192 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
3193 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
3194 | ||
3195 | /* Get our block major device number. */ | |
3196 | ||
27cc2594 AE |
3197 | rc = register_blkdev(0, rbd_dev->name); |
3198 | if (rc < 0) | |
85ae8926 | 3199 | goto err_out_id; |
27cc2594 | 3200 | rbd_dev->major = rc; |
602adf40 | 3201 | |
0f308a31 AE |
3202 | /* Set up the blkdev mapping. */ |
3203 | ||
3204 | rc = rbd_init_disk(rbd_dev); | |
dfc5606d | 3205 | if (rc) |
766fc439 YS |
3206 | goto err_out_blkdev; |
3207 | ||
0f308a31 AE |
3208 | rc = rbd_bus_add_dev(rbd_dev); |
3209 | if (rc) | |
3210 | goto err_out_disk; | |
3211 | ||
32eec68d AE |
3212 | /* |
3213 | * At this point cleanup in the event of an error is the job | |
3214 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
32eec68d | 3215 | */ |
2ac4e75d | 3216 | |
4bb1f1ed | 3217 | down_write(&rbd_dev->header_rwsem); |
5ed16177 | 3218 | rc = rbd_dev_snaps_register(rbd_dev); |
4bb1f1ed | 3219 | up_write(&rbd_dev->header_rwsem); |
2ac4e75d AE |
3220 | if (rc) |
3221 | goto err_out_bus; | |
3222 | ||
3ee4001e AE |
3223 | rc = rbd_init_watch_dev(rbd_dev); |
3224 | if (rc) | |
3225 | goto err_out_bus; | |
3226 | ||
2ac4e75d AE |
3227 | /* Everything's ready. Announce the disk to the world. */ |
3228 | ||
2ac4e75d | 3229 | add_disk(rbd_dev->disk); |
3ee4001e | 3230 | |
2ac4e75d AE |
3231 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
3232 | (unsigned long long) rbd_dev->mapping.size); | |
3233 | ||
602adf40 YS |
3234 | return count; |
3235 | ||
766fc439 | 3236 | err_out_bus: |
766fc439 YS |
3237 | /* this will also clean up rest of rbd_dev stuff */ |
3238 | ||
3239 | rbd_bus_del_dev(rbd_dev); | |
3240 | kfree(options); | |
766fc439 YS |
3241 | return rc; |
3242 | ||
0f308a31 AE |
3243 | err_out_disk: |
3244 | rbd_free_disk(rbd_dev); | |
602adf40 YS |
3245 | err_out_blkdev: |
3246 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
85ae8926 AE |
3247 | err_out_id: |
3248 | rbd_dev_id_put(rbd_dev); | |
41f38c2b AE |
3249 | err_out_snaps: |
3250 | rbd_remove_all_snaps(rbd_dev); | |
3251 | err_out_probe: | |
05fd6f6f | 3252 | rbd_header_free(&rbd_dev->header); |
602adf40 | 3253 | err_out_client: |
3fcf2581 | 3254 | kfree(rbd_dev->header_name); |
602adf40 | 3255 | rbd_put_client(rbd_dev); |
589d30e0 | 3256 | kfree(rbd_dev->image_id); |
85ae8926 | 3257 | err_out_args: |
971f839a | 3258 | kfree(rbd_dev->snap_name); |
85ae8926 AE |
3259 | kfree(rbd_dev->image_name); |
3260 | kfree(rbd_dev->pool_name); | |
3261 | err_out_mem: | |
27cc2594 | 3262 | kfree(rbd_dev); |
cb8627c7 | 3263 | kfree(options); |
27cc2594 | 3264 | |
602adf40 YS |
3265 | dout("Error adding device %s\n", buf); |
3266 | module_put(THIS_MODULE); | |
27cc2594 AE |
3267 | |
3268 | return (ssize_t) rc; | |
602adf40 YS |
3269 | } |
3270 | ||
de71a297 | 3271 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
3272 | { |
3273 | struct list_head *tmp; | |
3274 | struct rbd_device *rbd_dev; | |
3275 | ||
e124a82f | 3276 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
3277 | list_for_each(tmp, &rbd_dev_list) { |
3278 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 3279 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 3280 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 3281 | return rbd_dev; |
e124a82f | 3282 | } |
602adf40 | 3283 | } |
e124a82f | 3284 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
3285 | return NULL; |
3286 | } | |
3287 | ||
dfc5606d | 3288 | static void rbd_dev_release(struct device *dev) |
602adf40 | 3289 | { |
593a9e7b | 3290 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3291 | |
1dbb4399 AE |
3292 | if (rbd_dev->watch_request) { |
3293 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3294 | ||
3295 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 3296 | rbd_dev->watch_request); |
1dbb4399 | 3297 | } |
59c2be1e | 3298 | if (rbd_dev->watch_event) |
070c633f | 3299 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 3300 | |
602adf40 YS |
3301 | rbd_put_client(rbd_dev); |
3302 | ||
3303 | /* clean up and free blkdev */ | |
3304 | rbd_free_disk(rbd_dev); | |
3305 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 3306 | |
2ac4e75d AE |
3307 | /* release allocated disk header fields */ |
3308 | rbd_header_free(&rbd_dev->header); | |
3309 | ||
32eec68d | 3310 | /* done with the id, and with the rbd_dev */ |
971f839a | 3311 | kfree(rbd_dev->snap_name); |
589d30e0 | 3312 | kfree(rbd_dev->image_id); |
0bed54dc | 3313 | kfree(rbd_dev->header_name); |
d22f76e7 | 3314 | kfree(rbd_dev->pool_name); |
0bed54dc | 3315 | kfree(rbd_dev->image_name); |
e2839308 | 3316 | rbd_dev_id_put(rbd_dev); |
602adf40 YS |
3317 | kfree(rbd_dev); |
3318 | ||
3319 | /* release module ref */ | |
3320 | module_put(THIS_MODULE); | |
602adf40 YS |
3321 | } |
3322 | ||
dfc5606d YS |
3323 | static ssize_t rbd_remove(struct bus_type *bus, |
3324 | const char *buf, | |
3325 | size_t count) | |
602adf40 YS |
3326 | { |
3327 | struct rbd_device *rbd_dev = NULL; | |
3328 | int target_id, rc; | |
3329 | unsigned long ul; | |
3330 | int ret = count; | |
3331 | ||
3332 | rc = strict_strtoul(buf, 10, &ul); | |
3333 | if (rc) | |
3334 | return rc; | |
3335 | ||
3336 | /* convert to int; abort if we lost anything in the conversion */ | |
3337 | target_id = (int) ul; | |
3338 | if (target_id != ul) | |
3339 | return -EINVAL; | |
3340 | ||
3341 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3342 | ||
3343 | rbd_dev = __rbd_get_dev(target_id); | |
3344 | if (!rbd_dev) { | |
3345 | ret = -ENOENT; | |
3346 | goto done; | |
3347 | } | |
3348 | ||
41f38c2b | 3349 | rbd_remove_all_snaps(rbd_dev); |
dfc5606d | 3350 | rbd_bus_del_dev(rbd_dev); |
602adf40 YS |
3351 | |
3352 | done: | |
3353 | mutex_unlock(&ctl_mutex); | |
aafb230e | 3354 | |
602adf40 YS |
3355 | return ret; |
3356 | } | |
3357 | ||
602adf40 YS |
3358 | /* |
3359 | * create control files in sysfs | |
dfc5606d | 3360 | * /sys/bus/rbd/... |
602adf40 YS |
3361 | */ |
3362 | static int rbd_sysfs_init(void) | |
3363 | { | |
dfc5606d | 3364 | int ret; |
602adf40 | 3365 | |
fed4c143 | 3366 | ret = device_register(&rbd_root_dev); |
21079786 | 3367 | if (ret < 0) |
dfc5606d | 3368 | return ret; |
602adf40 | 3369 | |
fed4c143 AE |
3370 | ret = bus_register(&rbd_bus_type); |
3371 | if (ret < 0) | |
3372 | device_unregister(&rbd_root_dev); | |
602adf40 | 3373 | |
602adf40 YS |
3374 | return ret; |
3375 | } | |
3376 | ||
3377 | static void rbd_sysfs_cleanup(void) | |
3378 | { | |
dfc5606d | 3379 | bus_unregister(&rbd_bus_type); |
fed4c143 | 3380 | device_unregister(&rbd_root_dev); |
602adf40 YS |
3381 | } |
3382 | ||
3383 | int __init rbd_init(void) | |
3384 | { | |
3385 | int rc; | |
3386 | ||
3387 | rc = rbd_sysfs_init(); | |
3388 | if (rc) | |
3389 | return rc; | |
f0f8cef5 | 3390 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
3391 | return 0; |
3392 | } | |
3393 | ||
3394 | void __exit rbd_exit(void) | |
3395 | { | |
3396 | rbd_sysfs_cleanup(); | |
3397 | } | |
3398 | ||
3399 | module_init(rbd_init); | |
3400 | module_exit(rbd_exit); | |
3401 | ||
3402 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
3403 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
3404 | MODULE_DESCRIPTION("rados block device"); | |
3405 | ||
3406 | /* following authorship retained from original osdblk.c */ | |
3407 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
3408 | ||
3409 | MODULE_LICENSE("GPL"); |