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Commit | Line | Data |
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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 | ||
602adf40 | 64 | #define RBD_MAX_SNAP_NAME_LEN 32 |
35d489f9 | 65 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
66 | #define RBD_MAX_OPT_LEN 1024 |
67 | ||
68 | #define RBD_SNAP_HEAD_NAME "-" | |
69 | ||
1e130199 AE |
70 | #define RBD_IMAGE_ID_LEN_MAX 64 |
71 | #define RBD_OBJ_PREFIX_LEN_MAX 64 | |
589d30e0 | 72 | |
81a89793 AE |
73 | /* |
74 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
75 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
76 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
77 | * enough to hold all possible device names. | |
78 | */ | |
602adf40 | 79 | #define DEV_NAME_LEN 32 |
81a89793 | 80 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 81 | |
cc0538b6 | 82 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 83 | |
602adf40 YS |
84 | /* |
85 | * block device image metadata (in-memory version) | |
86 | */ | |
87 | struct rbd_image_header { | |
f84344f3 | 88 | /* These four fields never change for a given rbd image */ |
849b4260 | 89 | char *object_prefix; |
34b13184 | 90 | u64 features; |
602adf40 YS |
91 | __u8 obj_order; |
92 | __u8 crypt_type; | |
93 | __u8 comp_type; | |
602adf40 | 94 | |
f84344f3 AE |
95 | /* The remaining fields need to be updated occasionally */ |
96 | u64 image_size; | |
97 | struct ceph_snap_context *snapc; | |
602adf40 YS |
98 | char *snap_names; |
99 | u64 *snap_sizes; | |
59c2be1e YS |
100 | |
101 | u64 obj_version; | |
102 | }; | |
103 | ||
104 | struct rbd_options { | |
cc0538b6 | 105 | bool read_only; |
602adf40 YS |
106 | }; |
107 | ||
108 | /* | |
f0f8cef5 | 109 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
110 | */ |
111 | struct rbd_client { | |
112 | struct ceph_client *client; | |
113 | struct kref kref; | |
114 | struct list_head node; | |
115 | }; | |
116 | ||
117 | /* | |
f0f8cef5 | 118 | * a request completion status |
602adf40 | 119 | */ |
1fec7093 YS |
120 | struct rbd_req_status { |
121 | int done; | |
122 | int rc; | |
123 | u64 bytes; | |
124 | }; | |
125 | ||
126 | /* | |
127 | * a collection of requests | |
128 | */ | |
129 | struct rbd_req_coll { | |
130 | int total; | |
131 | int num_done; | |
132 | struct kref kref; | |
133 | struct rbd_req_status status[0]; | |
602adf40 YS |
134 | }; |
135 | ||
f0f8cef5 AE |
136 | /* |
137 | * a single io request | |
138 | */ | |
139 | struct rbd_request { | |
140 | struct request *rq; /* blk layer request */ | |
141 | struct bio *bio; /* cloned bio */ | |
142 | struct page **pages; /* list of used pages */ | |
143 | u64 len; | |
144 | int coll_index; | |
145 | struct rbd_req_coll *coll; | |
146 | }; | |
147 | ||
dfc5606d YS |
148 | struct rbd_snap { |
149 | struct device dev; | |
150 | const char *name; | |
3591538f | 151 | u64 size; |
dfc5606d YS |
152 | struct list_head node; |
153 | u64 id; | |
34b13184 | 154 | u64 features; |
dfc5606d YS |
155 | }; |
156 | ||
f84344f3 AE |
157 | struct rbd_mapping { |
158 | char *snap_name; | |
159 | u64 snap_id; | |
99c1f08f | 160 | u64 size; |
34b13184 | 161 | u64 features; |
f84344f3 AE |
162 | bool snap_exists; |
163 | bool read_only; | |
164 | }; | |
165 | ||
602adf40 YS |
166 | /* |
167 | * a single device | |
168 | */ | |
169 | struct rbd_device { | |
de71a297 | 170 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
171 | |
172 | int major; /* blkdev assigned major */ | |
173 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 174 | |
a30b71b9 | 175 | u32 image_format; /* Either 1 or 2 */ |
f8c38929 | 176 | struct rbd_options rbd_opts; |
602adf40 YS |
177 | struct rbd_client *rbd_client; |
178 | ||
179 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
180 | ||
181 | spinlock_t lock; /* queue lock */ | |
182 | ||
183 | struct rbd_image_header header; | |
589d30e0 AE |
184 | char *image_id; |
185 | size_t image_id_len; | |
0bed54dc AE |
186 | char *image_name; |
187 | size_t image_name_len; | |
188 | char *header_name; | |
d22f76e7 | 189 | char *pool_name; |
9bb2f334 | 190 | int pool_id; |
602adf40 | 191 | |
59c2be1e YS |
192 | struct ceph_osd_event *watch_event; |
193 | struct ceph_osd_request *watch_request; | |
194 | ||
c666601a JD |
195 | /* protects updating the header */ |
196 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
197 | |
198 | struct rbd_mapping mapping; | |
602adf40 YS |
199 | |
200 | struct list_head node; | |
dfc5606d YS |
201 | |
202 | /* list of snapshots */ | |
203 | struct list_head snaps; | |
204 | ||
205 | /* sysfs related */ | |
206 | struct device dev; | |
207 | }; | |
208 | ||
602adf40 | 209 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 210 | |
602adf40 | 211 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
212 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
213 | ||
432b8587 AE |
214 | static LIST_HEAD(rbd_client_list); /* clients */ |
215 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 216 | |
304f6808 AE |
217 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
218 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); | |
219 | ||
dfc5606d | 220 | static void rbd_dev_release(struct device *dev); |
14e7085d | 221 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 222 | |
f0f8cef5 AE |
223 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
224 | size_t count); | |
225 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
226 | size_t count); | |
227 | ||
228 | static struct bus_attribute rbd_bus_attrs[] = { | |
229 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
230 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
231 | __ATTR_NULL | |
232 | }; | |
233 | ||
234 | static struct bus_type rbd_bus_type = { | |
235 | .name = "rbd", | |
236 | .bus_attrs = rbd_bus_attrs, | |
237 | }; | |
238 | ||
239 | static void rbd_root_dev_release(struct device *dev) | |
240 | { | |
241 | } | |
242 | ||
243 | static struct device rbd_root_dev = { | |
244 | .init_name = "rbd", | |
245 | .release = rbd_root_dev_release, | |
246 | }; | |
247 | ||
aafb230e AE |
248 | #ifdef RBD_DEBUG |
249 | #define rbd_assert(expr) \ | |
250 | if (unlikely(!(expr))) { \ | |
251 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
252 | "at line %d:\n\n" \ | |
253 | "\trbd_assert(%s);\n\n", \ | |
254 | __func__, __LINE__, #expr); \ | |
255 | BUG(); \ | |
256 | } | |
257 | #else /* !RBD_DEBUG */ | |
258 | # define rbd_assert(expr) ((void) 0) | |
259 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 260 | |
dfc5606d YS |
261 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
262 | { | |
263 | return get_device(&rbd_dev->dev); | |
264 | } | |
265 | ||
266 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
267 | { | |
268 | put_device(&rbd_dev->dev); | |
269 | } | |
602adf40 | 270 | |
1fe5e993 | 271 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 272 | |
602adf40 YS |
273 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
274 | { | |
f0f8cef5 | 275 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 276 | |
f84344f3 | 277 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
278 | return -EROFS; |
279 | ||
340c7a2b | 280 | rbd_get_dev(rbd_dev); |
f84344f3 | 281 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
340c7a2b | 282 | |
602adf40 YS |
283 | return 0; |
284 | } | |
285 | ||
dfc5606d YS |
286 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
287 | { | |
288 | struct rbd_device *rbd_dev = disk->private_data; | |
289 | ||
290 | rbd_put_dev(rbd_dev); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
602adf40 YS |
295 | static const struct block_device_operations rbd_bd_ops = { |
296 | .owner = THIS_MODULE, | |
297 | .open = rbd_open, | |
dfc5606d | 298 | .release = rbd_release, |
602adf40 YS |
299 | }; |
300 | ||
301 | /* | |
302 | * Initialize an rbd client instance. | |
43ae4701 | 303 | * We own *ceph_opts. |
602adf40 | 304 | */ |
f8c38929 | 305 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
306 | { |
307 | struct rbd_client *rbdc; | |
308 | int ret = -ENOMEM; | |
309 | ||
310 | dout("rbd_client_create\n"); | |
311 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
312 | if (!rbdc) | |
313 | goto out_opt; | |
314 | ||
315 | kref_init(&rbdc->kref); | |
316 | INIT_LIST_HEAD(&rbdc->node); | |
317 | ||
bc534d86 AE |
318 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
319 | ||
43ae4701 | 320 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 321 | if (IS_ERR(rbdc->client)) |
bc534d86 | 322 | goto out_mutex; |
43ae4701 | 323 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
324 | |
325 | ret = ceph_open_session(rbdc->client); | |
326 | if (ret < 0) | |
327 | goto out_err; | |
328 | ||
432b8587 | 329 | spin_lock(&rbd_client_list_lock); |
602adf40 | 330 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 331 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 332 | |
bc534d86 AE |
333 | mutex_unlock(&ctl_mutex); |
334 | ||
602adf40 YS |
335 | dout("rbd_client_create created %p\n", rbdc); |
336 | return rbdc; | |
337 | ||
338 | out_err: | |
339 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
340 | out_mutex: |
341 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
342 | kfree(rbdc); |
343 | out_opt: | |
43ae4701 AE |
344 | if (ceph_opts) |
345 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 346 | return ERR_PTR(ret); |
602adf40 YS |
347 | } |
348 | ||
349 | /* | |
1f7ba331 AE |
350 | * Find a ceph client with specific addr and configuration. If |
351 | * found, bump its reference count. | |
602adf40 | 352 | */ |
1f7ba331 | 353 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
354 | { |
355 | struct rbd_client *client_node; | |
1f7ba331 | 356 | bool found = false; |
602adf40 | 357 | |
43ae4701 | 358 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
359 | return NULL; |
360 | ||
1f7ba331 AE |
361 | spin_lock(&rbd_client_list_lock); |
362 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
363 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
364 | kref_get(&client_node->kref); | |
365 | found = true; | |
366 | break; | |
367 | } | |
368 | } | |
369 | spin_unlock(&rbd_client_list_lock); | |
370 | ||
371 | return found ? client_node : NULL; | |
602adf40 YS |
372 | } |
373 | ||
59c2be1e YS |
374 | /* |
375 | * mount options | |
376 | */ | |
377 | enum { | |
59c2be1e YS |
378 | Opt_last_int, |
379 | /* int args above */ | |
380 | Opt_last_string, | |
381 | /* string args above */ | |
cc0538b6 AE |
382 | Opt_read_only, |
383 | Opt_read_write, | |
384 | /* Boolean args above */ | |
385 | Opt_last_bool, | |
59c2be1e YS |
386 | }; |
387 | ||
43ae4701 | 388 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
389 | /* int args above */ |
390 | /* string args above */ | |
f84344f3 | 391 | {Opt_read_only, "mapping.read_only"}, |
cc0538b6 AE |
392 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
393 | {Opt_read_write, "read_write"}, | |
394 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
395 | /* Boolean args above */ | |
59c2be1e YS |
396 | {-1, NULL} |
397 | }; | |
398 | ||
399 | static int parse_rbd_opts_token(char *c, void *private) | |
400 | { | |
43ae4701 | 401 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
402 | substring_t argstr[MAX_OPT_ARGS]; |
403 | int token, intval, ret; | |
404 | ||
43ae4701 | 405 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
406 | if (token < 0) |
407 | return -EINVAL; | |
408 | ||
409 | if (token < Opt_last_int) { | |
410 | ret = match_int(&argstr[0], &intval); | |
411 | if (ret < 0) { | |
412 | pr_err("bad mount option arg (not int) " | |
413 | "at '%s'\n", c); | |
414 | return ret; | |
415 | } | |
416 | dout("got int token %d val %d\n", token, intval); | |
417 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
418 | dout("got string token %d val %s\n", token, | |
419 | argstr[0].from); | |
cc0538b6 AE |
420 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
421 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
422 | } else { |
423 | dout("got token %d\n", token); | |
424 | } | |
425 | ||
426 | switch (token) { | |
cc0538b6 AE |
427 | case Opt_read_only: |
428 | rbd_opts->read_only = true; | |
429 | break; | |
430 | case Opt_read_write: | |
431 | rbd_opts->read_only = false; | |
432 | break; | |
59c2be1e | 433 | default: |
aafb230e AE |
434 | rbd_assert(false); |
435 | break; | |
59c2be1e YS |
436 | } |
437 | return 0; | |
438 | } | |
439 | ||
602adf40 YS |
440 | /* |
441 | * Get a ceph client with specific addr and configuration, if one does | |
442 | * not exist create it. | |
443 | */ | |
f8c38929 AE |
444 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
445 | size_t mon_addr_len, char *options) | |
602adf40 | 446 | { |
f8c38929 | 447 | struct rbd_options *rbd_opts = &rbd_dev->rbd_opts; |
43ae4701 | 448 | struct ceph_options *ceph_opts; |
f8c38929 | 449 | struct rbd_client *rbdc; |
59c2be1e | 450 | |
cc0538b6 | 451 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
602adf40 | 452 | |
43ae4701 AE |
453 | ceph_opts = ceph_parse_options(options, mon_addr, |
454 | mon_addr + mon_addr_len, | |
455 | parse_rbd_opts_token, rbd_opts); | |
f8c38929 AE |
456 | if (IS_ERR(ceph_opts)) |
457 | return PTR_ERR(ceph_opts); | |
602adf40 | 458 | |
1f7ba331 | 459 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 460 | if (rbdc) { |
602adf40 | 461 | /* using an existing client */ |
43ae4701 | 462 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
463 | } else { |
464 | rbdc = rbd_client_create(ceph_opts); | |
465 | if (IS_ERR(rbdc)) | |
466 | return PTR_ERR(rbdc); | |
602adf40 | 467 | } |
f8c38929 | 468 | rbd_dev->rbd_client = rbdc; |
602adf40 | 469 | |
f8c38929 | 470 | return 0; |
602adf40 YS |
471 | } |
472 | ||
473 | /* | |
474 | * Destroy ceph client | |
d23a4b3f | 475 | * |
432b8587 | 476 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
477 | */ |
478 | static void rbd_client_release(struct kref *kref) | |
479 | { | |
480 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
481 | ||
482 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 483 | spin_lock(&rbd_client_list_lock); |
602adf40 | 484 | list_del(&rbdc->node); |
cd9d9f5d | 485 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
486 | |
487 | ceph_destroy_client(rbdc->client); | |
488 | kfree(rbdc); | |
489 | } | |
490 | ||
491 | /* | |
492 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
493 | * it. | |
494 | */ | |
495 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
496 | { | |
497 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
498 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
499 | } |
500 | ||
1fec7093 YS |
501 | /* |
502 | * Destroy requests collection | |
503 | */ | |
504 | static void rbd_coll_release(struct kref *kref) | |
505 | { | |
506 | struct rbd_req_coll *coll = | |
507 | container_of(kref, struct rbd_req_coll, kref); | |
508 | ||
509 | dout("rbd_coll_release %p\n", coll); | |
510 | kfree(coll); | |
511 | } | |
602adf40 | 512 | |
a30b71b9 AE |
513 | static bool rbd_image_format_valid(u32 image_format) |
514 | { | |
515 | return image_format == 1 || image_format == 2; | |
516 | } | |
517 | ||
8e94af8e AE |
518 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
519 | { | |
103a150f AE |
520 | size_t size; |
521 | u32 snap_count; | |
522 | ||
523 | /* The header has to start with the magic rbd header text */ | |
524 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
525 | return false; | |
526 | ||
527 | /* | |
528 | * The size of a snapshot header has to fit in a size_t, and | |
529 | * that limits the number of snapshots. | |
530 | */ | |
531 | snap_count = le32_to_cpu(ondisk->snap_count); | |
532 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
533 | if (snap_count > size / sizeof (__le64)) | |
534 | return false; | |
535 | ||
536 | /* | |
537 | * Not only that, but the size of the entire the snapshot | |
538 | * header must also be representable in a size_t. | |
539 | */ | |
540 | size -= snap_count * sizeof (__le64); | |
541 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
542 | return false; | |
543 | ||
544 | return true; | |
8e94af8e AE |
545 | } |
546 | ||
602adf40 YS |
547 | /* |
548 | * Create a new header structure, translate header format from the on-disk | |
549 | * header. | |
550 | */ | |
551 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 552 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 553 | { |
ccece235 | 554 | u32 snap_count; |
58c17b0e | 555 | size_t len; |
d2bb24e5 | 556 | size_t size; |
621901d6 | 557 | u32 i; |
602adf40 | 558 | |
6a52325f AE |
559 | memset(header, 0, sizeof (*header)); |
560 | ||
103a150f AE |
561 | snap_count = le32_to_cpu(ondisk->snap_count); |
562 | ||
58c17b0e AE |
563 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
564 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 565 | if (!header->object_prefix) |
602adf40 | 566 | return -ENOMEM; |
58c17b0e AE |
567 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
568 | header->object_prefix[len] = '\0'; | |
00f1f36f | 569 | |
602adf40 | 570 | if (snap_count) { |
f785cc1d AE |
571 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
572 | ||
621901d6 AE |
573 | /* Save a copy of the snapshot names */ |
574 | ||
f785cc1d AE |
575 | if (snap_names_len > (u64) SIZE_MAX) |
576 | return -EIO; | |
577 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 578 | if (!header->snap_names) |
6a52325f | 579 | goto out_err; |
f785cc1d AE |
580 | /* |
581 | * Note that rbd_dev_v1_header_read() guarantees | |
582 | * the ondisk buffer we're working with has | |
583 | * snap_names_len bytes beyond the end of the | |
584 | * snapshot id array, this memcpy() is safe. | |
585 | */ | |
586 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
587 | snap_names_len); | |
6a52325f | 588 | |
621901d6 AE |
589 | /* Record each snapshot's size */ |
590 | ||
d2bb24e5 AE |
591 | size = snap_count * sizeof (*header->snap_sizes); |
592 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 593 | if (!header->snap_sizes) |
6a52325f | 594 | goto out_err; |
621901d6 AE |
595 | for (i = 0; i < snap_count; i++) |
596 | header->snap_sizes[i] = | |
597 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 598 | } else { |
ccece235 | 599 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
600 | header->snap_names = NULL; |
601 | header->snap_sizes = NULL; | |
602 | } | |
849b4260 | 603 | |
34b13184 | 604 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
605 | header->obj_order = ondisk->options.order; |
606 | header->crypt_type = ondisk->options.crypt_type; | |
607 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 608 | |
621901d6 AE |
609 | /* Allocate and fill in the snapshot context */ |
610 | ||
f84344f3 | 611 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
612 | size = sizeof (struct ceph_snap_context); |
613 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
614 | header->snapc = kzalloc(size, GFP_KERNEL); | |
615 | if (!header->snapc) | |
616 | goto out_err; | |
602adf40 YS |
617 | |
618 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 619 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 620 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
621 | for (i = 0; i < snap_count; i++) |
622 | header->snapc->snaps[i] = | |
623 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
624 | |
625 | return 0; | |
626 | ||
6a52325f | 627 | out_err: |
849b4260 | 628 | kfree(header->snap_sizes); |
ccece235 | 629 | header->snap_sizes = NULL; |
602adf40 | 630 | kfree(header->snap_names); |
ccece235 | 631 | header->snap_names = NULL; |
6a52325f AE |
632 | kfree(header->object_prefix); |
633 | header->object_prefix = NULL; | |
ccece235 | 634 | |
00f1f36f | 635 | return -ENOMEM; |
602adf40 YS |
636 | } |
637 | ||
8836b995 | 638 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 639 | { |
602adf40 | 640 | |
e86924a8 | 641 | struct rbd_snap *snap; |
602adf40 | 642 | |
e86924a8 AE |
643 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
644 | if (!strcmp(snap_name, snap->name)) { | |
645 | rbd_dev->mapping.snap_id = snap->id; | |
646 | rbd_dev->mapping.size = snap->size; | |
34b13184 | 647 | rbd_dev->mapping.features = snap->features; |
602adf40 | 648 | |
e86924a8 | 649 | return 0; |
00f1f36f | 650 | } |
00f1f36f | 651 | } |
e86924a8 | 652 | |
00f1f36f | 653 | return -ENOENT; |
602adf40 YS |
654 | } |
655 | ||
5ed16177 | 656 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev, char *snap_name) |
602adf40 | 657 | { |
78dc447d | 658 | int ret; |
602adf40 | 659 | |
4e1105a2 | 660 | if (!memcmp(snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 661 | sizeof (RBD_SNAP_HEAD_NAME))) { |
f84344f3 | 662 | rbd_dev->mapping.snap_id = CEPH_NOSNAP; |
99c1f08f | 663 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 664 | rbd_dev->mapping.features = rbd_dev->header.features; |
f84344f3 AE |
665 | rbd_dev->mapping.snap_exists = false; |
666 | rbd_dev->mapping.read_only = rbd_dev->rbd_opts.read_only; | |
e86924a8 | 667 | ret = 0; |
602adf40 | 668 | } else { |
8836b995 | 669 | ret = snap_by_name(rbd_dev, snap_name); |
602adf40 YS |
670 | if (ret < 0) |
671 | goto done; | |
f84344f3 AE |
672 | rbd_dev->mapping.snap_exists = true; |
673 | rbd_dev->mapping.read_only = true; | |
602adf40 | 674 | } |
4e1105a2 | 675 | rbd_dev->mapping.snap_name = snap_name; |
602adf40 | 676 | done: |
602adf40 YS |
677 | return ret; |
678 | } | |
679 | ||
680 | static void rbd_header_free(struct rbd_image_header *header) | |
681 | { | |
849b4260 | 682 | kfree(header->object_prefix); |
d78fd7ae | 683 | header->object_prefix = NULL; |
602adf40 | 684 | kfree(header->snap_sizes); |
d78fd7ae | 685 | header->snap_sizes = NULL; |
849b4260 | 686 | kfree(header->snap_names); |
d78fd7ae | 687 | header->snap_names = NULL; |
d1d25646 | 688 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 689 | header->snapc = NULL; |
602adf40 YS |
690 | } |
691 | ||
65ccfe21 | 692 | static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 693 | { |
65ccfe21 AE |
694 | char *name; |
695 | u64 segment; | |
696 | int ret; | |
602adf40 | 697 | |
65ccfe21 AE |
698 | name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
699 | if (!name) | |
700 | return NULL; | |
701 | segment = offset >> rbd_dev->header.obj_order; | |
702 | ret = snprintf(name, RBD_MAX_SEG_NAME_LEN, "%s.%012llx", | |
703 | rbd_dev->header.object_prefix, segment); | |
704 | if (ret < 0 || ret >= RBD_MAX_SEG_NAME_LEN) { | |
705 | pr_err("error formatting segment name for #%llu (%d)\n", | |
706 | segment, ret); | |
707 | kfree(name); | |
708 | name = NULL; | |
709 | } | |
602adf40 | 710 | |
65ccfe21 AE |
711 | return name; |
712 | } | |
602adf40 | 713 | |
65ccfe21 AE |
714 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
715 | { | |
716 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 717 | |
65ccfe21 AE |
718 | return offset & (segment_size - 1); |
719 | } | |
720 | ||
721 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
722 | u64 offset, u64 length) | |
723 | { | |
724 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
725 | ||
726 | offset &= segment_size - 1; | |
727 | ||
aafb230e | 728 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
729 | if (offset + length > segment_size) |
730 | length = segment_size - offset; | |
731 | ||
732 | return length; | |
602adf40 YS |
733 | } |
734 | ||
1fec7093 YS |
735 | static int rbd_get_num_segments(struct rbd_image_header *header, |
736 | u64 ofs, u64 len) | |
737 | { | |
df111be6 AE |
738 | u64 start_seg; |
739 | u64 end_seg; | |
740 | ||
741 | if (!len) | |
742 | return 0; | |
743 | if (len - 1 > U64_MAX - ofs) | |
744 | return -ERANGE; | |
745 | ||
746 | start_seg = ofs >> header->obj_order; | |
747 | end_seg = (ofs + len - 1) >> header->obj_order; | |
748 | ||
1fec7093 YS |
749 | return end_seg - start_seg + 1; |
750 | } | |
751 | ||
029bcbd8 JD |
752 | /* |
753 | * returns the size of an object in the image | |
754 | */ | |
755 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
756 | { | |
757 | return 1 << header->obj_order; | |
758 | } | |
759 | ||
602adf40 YS |
760 | /* |
761 | * bio helpers | |
762 | */ | |
763 | ||
764 | static void bio_chain_put(struct bio *chain) | |
765 | { | |
766 | struct bio *tmp; | |
767 | ||
768 | while (chain) { | |
769 | tmp = chain; | |
770 | chain = chain->bi_next; | |
771 | bio_put(tmp); | |
772 | } | |
773 | } | |
774 | ||
775 | /* | |
776 | * zeros a bio chain, starting at specific offset | |
777 | */ | |
778 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
779 | { | |
780 | struct bio_vec *bv; | |
781 | unsigned long flags; | |
782 | void *buf; | |
783 | int i; | |
784 | int pos = 0; | |
785 | ||
786 | while (chain) { | |
787 | bio_for_each_segment(bv, chain, i) { | |
788 | if (pos + bv->bv_len > start_ofs) { | |
789 | int remainder = max(start_ofs - pos, 0); | |
790 | buf = bvec_kmap_irq(bv, &flags); | |
791 | memset(buf + remainder, 0, | |
792 | bv->bv_len - remainder); | |
85b5aaa6 | 793 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
794 | } |
795 | pos += bv->bv_len; | |
796 | } | |
797 | ||
798 | chain = chain->bi_next; | |
799 | } | |
800 | } | |
801 | ||
802 | /* | |
803 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
804 | * might return a bio_pair that will need to be released. | |
805 | */ | |
806 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
807 | struct bio_pair **bp, | |
808 | int len, gfp_t gfpmask) | |
809 | { | |
542582fc AE |
810 | struct bio *old_chain = *old; |
811 | struct bio *new_chain = NULL; | |
812 | struct bio *tail; | |
602adf40 YS |
813 | int total = 0; |
814 | ||
815 | if (*bp) { | |
816 | bio_pair_release(*bp); | |
817 | *bp = NULL; | |
818 | } | |
819 | ||
820 | while (old_chain && (total < len)) { | |
542582fc AE |
821 | struct bio *tmp; |
822 | ||
602adf40 YS |
823 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
824 | if (!tmp) | |
825 | goto err_out; | |
542582fc | 826 | gfpmask &= ~__GFP_WAIT; /* can't wait after the first */ |
602adf40 YS |
827 | |
828 | if (total + old_chain->bi_size > len) { | |
829 | struct bio_pair *bp; | |
830 | ||
831 | /* | |
832 | * this split can only happen with a single paged bio, | |
833 | * split_bio will BUG_ON if this is not the case | |
834 | */ | |
835 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
836 | "bi_size=%u\n", |
837 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
838 | |
839 | /* split the bio. We'll release it either in the next | |
840 | call, or it will have to be released outside */ | |
593a9e7b | 841 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
842 | if (!bp) |
843 | goto err_out; | |
844 | ||
845 | __bio_clone(tmp, &bp->bio1); | |
846 | ||
847 | *next = &bp->bio2; | |
848 | } else { | |
849 | __bio_clone(tmp, old_chain); | |
850 | *next = old_chain->bi_next; | |
851 | } | |
852 | ||
853 | tmp->bi_bdev = NULL; | |
602adf40 | 854 | tmp->bi_next = NULL; |
542582fc | 855 | if (new_chain) |
602adf40 | 856 | tail->bi_next = tmp; |
542582fc AE |
857 | else |
858 | new_chain = tmp; | |
859 | tail = tmp; | |
602adf40 YS |
860 | old_chain = old_chain->bi_next; |
861 | ||
862 | total += tmp->bi_size; | |
863 | } | |
864 | ||
aafb230e | 865 | rbd_assert(total == len); |
602adf40 | 866 | |
602adf40 YS |
867 | *old = old_chain; |
868 | ||
869 | return new_chain; | |
870 | ||
871 | err_out: | |
872 | dout("bio_chain_clone with err\n"); | |
873 | bio_chain_put(new_chain); | |
874 | return NULL; | |
875 | } | |
876 | ||
877 | /* | |
878 | * helpers for osd request op vectors. | |
879 | */ | |
57cfc106 AE |
880 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
881 | int opcode, u32 payload_len) | |
602adf40 | 882 | { |
57cfc106 AE |
883 | struct ceph_osd_req_op *ops; |
884 | ||
885 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
886 | if (!ops) | |
887 | return NULL; | |
888 | ||
889 | ops[0].op = opcode; | |
890 | ||
602adf40 YS |
891 | /* |
892 | * op extent offset and length will be set later on | |
893 | * in calc_raw_layout() | |
894 | */ | |
57cfc106 AE |
895 | ops[0].payload_len = payload_len; |
896 | ||
897 | return ops; | |
602adf40 YS |
898 | } |
899 | ||
900 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
901 | { | |
902 | kfree(ops); | |
903 | } | |
904 | ||
1fec7093 YS |
905 | static void rbd_coll_end_req_index(struct request *rq, |
906 | struct rbd_req_coll *coll, | |
907 | int index, | |
908 | int ret, u64 len) | |
909 | { | |
910 | struct request_queue *q; | |
911 | int min, max, i; | |
912 | ||
bd919d45 AE |
913 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
914 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
915 | |
916 | if (!rq) | |
917 | return; | |
918 | ||
919 | if (!coll) { | |
920 | blk_end_request(rq, ret, len); | |
921 | return; | |
922 | } | |
923 | ||
924 | q = rq->q; | |
925 | ||
926 | spin_lock_irq(q->queue_lock); | |
927 | coll->status[index].done = 1; | |
928 | coll->status[index].rc = ret; | |
929 | coll->status[index].bytes = len; | |
930 | max = min = coll->num_done; | |
931 | while (max < coll->total && coll->status[max].done) | |
932 | max++; | |
933 | ||
934 | for (i = min; i<max; i++) { | |
935 | __blk_end_request(rq, coll->status[i].rc, | |
936 | coll->status[i].bytes); | |
937 | coll->num_done++; | |
938 | kref_put(&coll->kref, rbd_coll_release); | |
939 | } | |
940 | spin_unlock_irq(q->queue_lock); | |
941 | } | |
942 | ||
943 | static void rbd_coll_end_req(struct rbd_request *req, | |
944 | int ret, u64 len) | |
945 | { | |
946 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
947 | } | |
948 | ||
602adf40 YS |
949 | /* |
950 | * Send ceph osd request | |
951 | */ | |
952 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 953 | struct rbd_device *rbd_dev, |
602adf40 YS |
954 | struct ceph_snap_context *snapc, |
955 | u64 snapid, | |
aded07ea | 956 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
957 | struct bio *bio, |
958 | struct page **pages, | |
959 | int num_pages, | |
960 | int flags, | |
961 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
962 | struct rbd_req_coll *coll, |
963 | int coll_index, | |
602adf40 | 964 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
965 | struct ceph_msg *msg), |
966 | struct ceph_osd_request **linger_req, | |
967 | u64 *ver) | |
602adf40 YS |
968 | { |
969 | struct ceph_osd_request *req; | |
970 | struct ceph_file_layout *layout; | |
971 | int ret; | |
972 | u64 bno; | |
973 | struct timespec mtime = CURRENT_TIME; | |
974 | struct rbd_request *req_data; | |
975 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 976 | struct ceph_osd_client *osdc; |
602adf40 | 977 | |
602adf40 | 978 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
979 | if (!req_data) { |
980 | if (coll) | |
981 | rbd_coll_end_req_index(rq, coll, coll_index, | |
982 | -ENOMEM, len); | |
983 | return -ENOMEM; | |
984 | } | |
985 | ||
986 | if (coll) { | |
987 | req_data->coll = coll; | |
988 | req_data->coll_index = coll_index; | |
989 | } | |
602adf40 | 990 | |
bd919d45 AE |
991 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
992 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 993 | |
0ce1a794 | 994 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
995 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
996 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 997 | if (!req) { |
4ad12621 | 998 | ret = -ENOMEM; |
602adf40 YS |
999 | goto done_pages; |
1000 | } | |
1001 | ||
1002 | req->r_callback = rbd_cb; | |
1003 | ||
1004 | req_data->rq = rq; | |
1005 | req_data->bio = bio; | |
1006 | req_data->pages = pages; | |
1007 | req_data->len = len; | |
1008 | ||
1009 | req->r_priv = req_data; | |
1010 | ||
1011 | reqhead = req->r_request->front.iov_base; | |
1012 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
1013 | ||
aded07ea | 1014 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
1015 | req->r_oid_len = strlen(req->r_oid); |
1016 | ||
1017 | layout = &req->r_file_layout; | |
1018 | memset(layout, 0, sizeof(*layout)); | |
1019 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
1020 | layout->fl_stripe_count = cpu_to_le32(1); | |
1021 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 1022 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
6cae3717 SW |
1023 | ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
1024 | req, ops); | |
1025 | rbd_assert(ret == 0); | |
602adf40 YS |
1026 | |
1027 | ceph_osdc_build_request(req, ofs, &len, | |
1028 | ops, | |
1029 | snapc, | |
1030 | &mtime, | |
1031 | req->r_oid, req->r_oid_len); | |
602adf40 | 1032 | |
59c2be1e | 1033 | if (linger_req) { |
1dbb4399 | 1034 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
1035 | *linger_req = req; |
1036 | } | |
1037 | ||
1dbb4399 | 1038 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
1039 | if (ret < 0) |
1040 | goto done_err; | |
1041 | ||
1042 | if (!rbd_cb) { | |
1dbb4399 | 1043 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1044 | if (ver) |
1045 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1046 | dout("reassert_ver=%llu\n", |
1047 | (unsigned long long) | |
1048 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1049 | ceph_osdc_put_request(req); |
1050 | } | |
1051 | return ret; | |
1052 | ||
1053 | done_err: | |
1054 | bio_chain_put(req_data->bio); | |
1055 | ceph_osdc_put_request(req); | |
1056 | done_pages: | |
1fec7093 | 1057 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1058 | kfree(req_data); |
602adf40 YS |
1059 | return ret; |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Ceph osd op callback | |
1064 | */ | |
1065 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1066 | { | |
1067 | struct rbd_request *req_data = req->r_priv; | |
1068 | struct ceph_osd_reply_head *replyhead; | |
1069 | struct ceph_osd_op *op; | |
1070 | __s32 rc; | |
1071 | u64 bytes; | |
1072 | int read_op; | |
1073 | ||
1074 | /* parse reply */ | |
1075 | replyhead = msg->front.iov_base; | |
1076 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1077 | op = (void *)(replyhead + 1); | |
1078 | rc = le32_to_cpu(replyhead->result); | |
1079 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1080 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1081 | |
bd919d45 AE |
1082 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1083 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1084 | |
1085 | if (rc == -ENOENT && read_op) { | |
1086 | zero_bio_chain(req_data->bio, 0); | |
1087 | rc = 0; | |
1088 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1089 | zero_bio_chain(req_data->bio, bytes); | |
1090 | bytes = req_data->len; | |
1091 | } | |
1092 | ||
1fec7093 | 1093 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1094 | |
1095 | if (req_data->bio) | |
1096 | bio_chain_put(req_data->bio); | |
1097 | ||
1098 | ceph_osdc_put_request(req); | |
1099 | kfree(req_data); | |
1100 | } | |
1101 | ||
59c2be1e YS |
1102 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1103 | { | |
1104 | ceph_osdc_put_request(req); | |
1105 | } | |
1106 | ||
602adf40 YS |
1107 | /* |
1108 | * Do a synchronous ceph osd operation | |
1109 | */ | |
0ce1a794 | 1110 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1111 | struct ceph_snap_context *snapc, |
1112 | u64 snapid, | |
602adf40 | 1113 | int flags, |
913d2fdc | 1114 | struct ceph_osd_req_op *ops, |
aded07ea | 1115 | const char *object_name, |
f8d4de6e AE |
1116 | u64 ofs, u64 inbound_size, |
1117 | char *inbound, | |
59c2be1e YS |
1118 | struct ceph_osd_request **linger_req, |
1119 | u64 *ver) | |
602adf40 YS |
1120 | { |
1121 | int ret; | |
1122 | struct page **pages; | |
1123 | int num_pages; | |
913d2fdc | 1124 | |
aafb230e | 1125 | rbd_assert(ops != NULL); |
602adf40 | 1126 | |
f8d4de6e | 1127 | num_pages = calc_pages_for(ofs, inbound_size); |
602adf40 | 1128 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
b8d0638a DC |
1129 | if (IS_ERR(pages)) |
1130 | return PTR_ERR(pages); | |
602adf40 | 1131 | |
0ce1a794 | 1132 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
f8d4de6e | 1133 | object_name, ofs, inbound_size, NULL, |
602adf40 YS |
1134 | pages, num_pages, |
1135 | flags, | |
1136 | ops, | |
1fec7093 | 1137 | NULL, 0, |
59c2be1e YS |
1138 | NULL, |
1139 | linger_req, ver); | |
602adf40 | 1140 | if (ret < 0) |
913d2fdc | 1141 | goto done; |
602adf40 | 1142 | |
f8d4de6e AE |
1143 | if ((flags & CEPH_OSD_FLAG_READ) && inbound) |
1144 | ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret); | |
602adf40 | 1145 | |
602adf40 YS |
1146 | done: |
1147 | ceph_release_page_vector(pages, num_pages); | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Do an asynchronous ceph osd operation | |
1153 | */ | |
1154 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1155 | struct rbd_device *rbd_dev, |
602adf40 YS |
1156 | struct ceph_snap_context *snapc, |
1157 | u64 snapid, | |
d1f57ea6 | 1158 | int opcode, int flags, |
602adf40 | 1159 | u64 ofs, u64 len, |
1fec7093 YS |
1160 | struct bio *bio, |
1161 | struct rbd_req_coll *coll, | |
1162 | int coll_index) | |
602adf40 YS |
1163 | { |
1164 | char *seg_name; | |
1165 | u64 seg_ofs; | |
1166 | u64 seg_len; | |
1167 | int ret; | |
1168 | struct ceph_osd_req_op *ops; | |
1169 | u32 payload_len; | |
1170 | ||
65ccfe21 | 1171 | seg_name = rbd_segment_name(rbd_dev, ofs); |
602adf40 YS |
1172 | if (!seg_name) |
1173 | return -ENOMEM; | |
65ccfe21 AE |
1174 | seg_len = rbd_segment_length(rbd_dev, ofs, len); |
1175 | seg_ofs = rbd_segment_offset(rbd_dev, ofs); | |
602adf40 YS |
1176 | |
1177 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1178 | ||
57cfc106 AE |
1179 | ret = -ENOMEM; |
1180 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1181 | if (!ops) | |
602adf40 YS |
1182 | goto done; |
1183 | ||
1184 | /* we've taken care of segment sizes earlier when we | |
1185 | cloned the bios. We should never have a segment | |
1186 | truncated at this point */ | |
aafb230e | 1187 | rbd_assert(seg_len == len); |
602adf40 YS |
1188 | |
1189 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1190 | seg_name, seg_ofs, seg_len, | |
1191 | bio, | |
1192 | NULL, 0, | |
1193 | flags, | |
1194 | ops, | |
1fec7093 | 1195 | coll, coll_index, |
59c2be1e | 1196 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1197 | |
1198 | rbd_destroy_ops(ops); | |
602adf40 YS |
1199 | done: |
1200 | kfree(seg_name); | |
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Request async osd write | |
1206 | */ | |
1207 | static int rbd_req_write(struct request *rq, | |
1208 | struct rbd_device *rbd_dev, | |
1209 | struct ceph_snap_context *snapc, | |
1210 | u64 ofs, u64 len, | |
1fec7093 YS |
1211 | struct bio *bio, |
1212 | struct rbd_req_coll *coll, | |
1213 | int coll_index) | |
602adf40 YS |
1214 | { |
1215 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1216 | CEPH_OSD_OP_WRITE, | |
1217 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1218 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * Request async osd read | |
1223 | */ | |
1224 | static int rbd_req_read(struct request *rq, | |
1225 | struct rbd_device *rbd_dev, | |
1226 | u64 snapid, | |
1227 | u64 ofs, u64 len, | |
1fec7093 YS |
1228 | struct bio *bio, |
1229 | struct rbd_req_coll *coll, | |
1230 | int coll_index) | |
602adf40 YS |
1231 | { |
1232 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1233 | snapid, |
602adf40 YS |
1234 | CEPH_OSD_OP_READ, |
1235 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1236 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1237 | } |
1238 | ||
1239 | /* | |
1240 | * Request sync osd read | |
1241 | */ | |
0ce1a794 | 1242 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1243 | u64 snapid, |
aded07ea | 1244 | const char *object_name, |
602adf40 | 1245 | u64 ofs, u64 len, |
59c2be1e YS |
1246 | char *buf, |
1247 | u64 *ver) | |
602adf40 | 1248 | { |
913d2fdc AE |
1249 | struct ceph_osd_req_op *ops; |
1250 | int ret; | |
1251 | ||
1252 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1253 | if (!ops) | |
1254 | return -ENOMEM; | |
1255 | ||
1256 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1257 | snapid, |
602adf40 | 1258 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1259 | ops, object_name, ofs, len, buf, NULL, ver); |
1260 | rbd_destroy_ops(ops); | |
1261 | ||
1262 | return ret; | |
602adf40 YS |
1263 | } |
1264 | ||
1265 | /* | |
59c2be1e YS |
1266 | * Request sync osd watch |
1267 | */ | |
0ce1a794 | 1268 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1269 | u64 ver, |
7f0a24d8 | 1270 | u64 notify_id) |
59c2be1e YS |
1271 | { |
1272 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1273 | int ret; |
1274 | ||
57cfc106 AE |
1275 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1276 | if (!ops) | |
1277 | return -ENOMEM; | |
59c2be1e | 1278 | |
a71b891b | 1279 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1280 | ops[0].watch.cookie = notify_id; |
1281 | ops[0].watch.flag = 0; | |
1282 | ||
0ce1a794 | 1283 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1284 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1285 | NULL, 0, |
59c2be1e YS |
1286 | CEPH_OSD_FLAG_READ, |
1287 | ops, | |
1fec7093 | 1288 | NULL, 0, |
59c2be1e YS |
1289 | rbd_simple_req_cb, 0, NULL); |
1290 | ||
1291 | rbd_destroy_ops(ops); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1296 | { | |
0ce1a794 | 1297 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1298 | u64 hver; |
13143d2d SW |
1299 | int rc; |
1300 | ||
0ce1a794 | 1301 | if (!rbd_dev) |
59c2be1e YS |
1302 | return; |
1303 | ||
bd919d45 AE |
1304 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1305 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1306 | (unsigned int) opcode); | |
1fe5e993 | 1307 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1308 | if (rc) |
f0f8cef5 | 1309 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1310 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1311 | |
7f0a24d8 | 1312 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1313 | } |
1314 | ||
1315 | /* | |
1316 | * Request sync osd watch | |
1317 | */ | |
0e6f322d | 1318 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1319 | { |
1320 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1321 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1322 | int ret; |
59c2be1e | 1323 | |
57cfc106 AE |
1324 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1325 | if (!ops) | |
1326 | return -ENOMEM; | |
59c2be1e YS |
1327 | |
1328 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1329 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1330 | if (ret < 0) |
1331 | goto fail; | |
1332 | ||
0e6f322d | 1333 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1334 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1335 | ops[0].watch.flag = 1; |
1336 | ||
0ce1a794 | 1337 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1338 | CEPH_NOSNAP, |
59c2be1e YS |
1339 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1340 | ops, | |
0e6f322d AE |
1341 | rbd_dev->header_name, |
1342 | 0, 0, NULL, | |
0ce1a794 | 1343 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1344 | |
1345 | if (ret < 0) | |
1346 | goto fail_event; | |
1347 | ||
1348 | rbd_destroy_ops(ops); | |
1349 | return 0; | |
1350 | ||
1351 | fail_event: | |
0ce1a794 AE |
1352 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1353 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1354 | fail: |
1355 | rbd_destroy_ops(ops); | |
1356 | return ret; | |
1357 | } | |
1358 | ||
79e3057c YS |
1359 | /* |
1360 | * Request sync osd unwatch | |
1361 | */ | |
070c633f | 1362 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1363 | { |
1364 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1365 | int ret; |
79e3057c | 1366 | |
57cfc106 AE |
1367 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1368 | if (!ops) | |
1369 | return -ENOMEM; | |
79e3057c YS |
1370 | |
1371 | ops[0].watch.ver = 0; | |
0ce1a794 | 1372 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1373 | ops[0].watch.flag = 0; |
1374 | ||
0ce1a794 | 1375 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1376 | CEPH_NOSNAP, |
79e3057c YS |
1377 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1378 | ops, | |
070c633f AE |
1379 | rbd_dev->header_name, |
1380 | 0, 0, NULL, NULL, NULL); | |
1381 | ||
79e3057c YS |
1382 | |
1383 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1384 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1385 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1386 | return ret; |
1387 | } | |
1388 | ||
602adf40 | 1389 | /* |
3cb4a687 | 1390 | * Synchronous osd object method call |
602adf40 | 1391 | */ |
0ce1a794 | 1392 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1393 | const char *object_name, |
1394 | const char *class_name, | |
1395 | const char *method_name, | |
3cb4a687 AE |
1396 | const char *outbound, |
1397 | size_t outbound_size, | |
f8d4de6e AE |
1398 | char *inbound, |
1399 | size_t inbound_size, | |
3cb4a687 | 1400 | int flags, |
59c2be1e | 1401 | u64 *ver) |
602adf40 YS |
1402 | { |
1403 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1404 | int class_name_len = strlen(class_name); |
1405 | int method_name_len = strlen(method_name); | |
3cb4a687 | 1406 | int payload_size; |
57cfc106 AE |
1407 | int ret; |
1408 | ||
3cb4a687 AE |
1409 | /* |
1410 | * Any input parameters required by the method we're calling | |
1411 | * will be sent along with the class and method names as | |
1412 | * part of the message payload. That data and its size are | |
1413 | * supplied via the indata and indata_len fields (named from | |
1414 | * the perspective of the server side) in the OSD request | |
1415 | * operation. | |
1416 | */ | |
1417 | payload_size = class_name_len + method_name_len + outbound_size; | |
1418 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size); | |
57cfc106 AE |
1419 | if (!ops) |
1420 | return -ENOMEM; | |
602adf40 | 1421 | |
aded07ea AE |
1422 | ops[0].cls.class_name = class_name; |
1423 | ops[0].cls.class_len = (__u8) class_name_len; | |
1424 | ops[0].cls.method_name = method_name; | |
1425 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 | 1426 | ops[0].cls.argc = 0; |
3cb4a687 AE |
1427 | ops[0].cls.indata = outbound; |
1428 | ops[0].cls.indata_len = outbound_size; | |
602adf40 | 1429 | |
0ce1a794 | 1430 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1431 | CEPH_NOSNAP, |
3cb4a687 | 1432 | flags, ops, |
f8d4de6e AE |
1433 | object_name, 0, inbound_size, inbound, |
1434 | NULL, ver); | |
602adf40 YS |
1435 | |
1436 | rbd_destroy_ops(ops); | |
1437 | ||
1438 | dout("cls_exec returned %d\n", ret); | |
1439 | return ret; | |
1440 | } | |
1441 | ||
1fec7093 YS |
1442 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1443 | { | |
1444 | struct rbd_req_coll *coll = | |
1445 | kzalloc(sizeof(struct rbd_req_coll) + | |
1446 | sizeof(struct rbd_req_status) * num_reqs, | |
1447 | GFP_ATOMIC); | |
1448 | ||
1449 | if (!coll) | |
1450 | return NULL; | |
1451 | coll->total = num_reqs; | |
1452 | kref_init(&coll->kref); | |
1453 | return coll; | |
1454 | } | |
1455 | ||
602adf40 YS |
1456 | /* |
1457 | * block device queue callback | |
1458 | */ | |
1459 | static void rbd_rq_fn(struct request_queue *q) | |
1460 | { | |
1461 | struct rbd_device *rbd_dev = q->queuedata; | |
1462 | struct request *rq; | |
1463 | struct bio_pair *bp = NULL; | |
1464 | ||
00f1f36f | 1465 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1466 | struct bio *bio; |
1467 | struct bio *rq_bio, *next_bio = NULL; | |
1468 | bool do_write; | |
bd919d45 AE |
1469 | unsigned int size; |
1470 | u64 op_size = 0; | |
602adf40 | 1471 | u64 ofs; |
1fec7093 YS |
1472 | int num_segs, cur_seg = 0; |
1473 | struct rbd_req_coll *coll; | |
d1d25646 | 1474 | struct ceph_snap_context *snapc; |
602adf40 | 1475 | |
602adf40 YS |
1476 | dout("fetched request\n"); |
1477 | ||
1478 | /* filter out block requests we don't understand */ | |
1479 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1480 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1481 | continue; |
602adf40 YS |
1482 | } |
1483 | ||
1484 | /* deduce our operation (read, write) */ | |
1485 | do_write = (rq_data_dir(rq) == WRITE); | |
1486 | ||
1487 | size = blk_rq_bytes(rq); | |
593a9e7b | 1488 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 | 1489 | rq_bio = rq->bio; |
f84344f3 | 1490 | if (do_write && rbd_dev->mapping.read_only) { |
602adf40 | 1491 | __blk_end_request_all(rq, -EROFS); |
00f1f36f | 1492 | continue; |
602adf40 YS |
1493 | } |
1494 | ||
1495 | spin_unlock_irq(q->queue_lock); | |
1496 | ||
d1d25646 | 1497 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1498 | |
f84344f3 AE |
1499 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP && |
1500 | !rbd_dev->mapping.snap_exists) { | |
e88a36ec | 1501 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1502 | dout("request for non-existent snapshot"); |
1503 | spin_lock_irq(q->queue_lock); | |
1504 | __blk_end_request_all(rq, -ENXIO); | |
1505 | continue; | |
e88a36ec JD |
1506 | } |
1507 | ||
d1d25646 JD |
1508 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1509 | ||
1510 | up_read(&rbd_dev->header_rwsem); | |
1511 | ||
602adf40 YS |
1512 | dout("%s 0x%x bytes at 0x%llx\n", |
1513 | do_write ? "write" : "read", | |
bd919d45 | 1514 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1515 | |
1fec7093 | 1516 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
df111be6 AE |
1517 | if (num_segs <= 0) { |
1518 | spin_lock_irq(q->queue_lock); | |
1519 | __blk_end_request_all(rq, num_segs); | |
1520 | ceph_put_snap_context(snapc); | |
1521 | continue; | |
1522 | } | |
1fec7093 YS |
1523 | coll = rbd_alloc_coll(num_segs); |
1524 | if (!coll) { | |
1525 | spin_lock_irq(q->queue_lock); | |
1526 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1527 | ceph_put_snap_context(snapc); |
00f1f36f | 1528 | continue; |
1fec7093 YS |
1529 | } |
1530 | ||
602adf40 YS |
1531 | do { |
1532 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1533 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
65ccfe21 | 1534 | op_size = rbd_segment_length(rbd_dev, ofs, size); |
1fec7093 | 1535 | kref_get(&coll->kref); |
602adf40 YS |
1536 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1537 | op_size, GFP_ATOMIC); | |
1538 | if (!bio) { | |
1fec7093 YS |
1539 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1540 | -ENOMEM, op_size); | |
1541 | goto next_seg; | |
602adf40 YS |
1542 | } |
1543 | ||
1fec7093 | 1544 | |
602adf40 YS |
1545 | /* init OSD command: write or read */ |
1546 | if (do_write) | |
1547 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1548 | snapc, |
602adf40 | 1549 | ofs, |
1fec7093 YS |
1550 | op_size, bio, |
1551 | coll, cur_seg); | |
602adf40 YS |
1552 | else |
1553 | rbd_req_read(rq, rbd_dev, | |
f84344f3 | 1554 | rbd_dev->mapping.snap_id, |
602adf40 | 1555 | ofs, |
1fec7093 YS |
1556 | op_size, bio, |
1557 | coll, cur_seg); | |
602adf40 | 1558 | |
1fec7093 | 1559 | next_seg: |
602adf40 YS |
1560 | size -= op_size; |
1561 | ofs += op_size; | |
1562 | ||
1fec7093 | 1563 | cur_seg++; |
602adf40 YS |
1564 | rq_bio = next_bio; |
1565 | } while (size > 0); | |
1fec7093 | 1566 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1567 | |
1568 | if (bp) | |
1569 | bio_pair_release(bp); | |
602adf40 | 1570 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1571 | |
1572 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1573 | } |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1578 | * multiple osd objects. One exception would be with a single page bios, | |
1579 | * which we handle later at bio_chain_clone | |
1580 | */ | |
1581 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1582 | struct bio_vec *bvec) | |
1583 | { | |
1584 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1585 | unsigned int chunk_sectors; |
1586 | sector_t sector; | |
1587 | unsigned int bio_sectors; | |
602adf40 YS |
1588 | int max; |
1589 | ||
593a9e7b AE |
1590 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1591 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1592 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1593 | ||
602adf40 | 1594 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1595 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1596 | if (max < 0) |
1597 | max = 0; /* bio_add cannot handle a negative return */ | |
1598 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1599 | return bvec->bv_len; | |
1600 | return max; | |
1601 | } | |
1602 | ||
1603 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1604 | { | |
1605 | struct gendisk *disk = rbd_dev->disk; | |
1606 | ||
1607 | if (!disk) | |
1608 | return; | |
1609 | ||
602adf40 YS |
1610 | if (disk->flags & GENHD_FL_UP) |
1611 | del_gendisk(disk); | |
1612 | if (disk->queue) | |
1613 | blk_cleanup_queue(disk->queue); | |
1614 | put_disk(disk); | |
1615 | } | |
1616 | ||
1617 | /* | |
4156d998 AE |
1618 | * Read the complete header for the given rbd device. |
1619 | * | |
1620 | * Returns a pointer to a dynamically-allocated buffer containing | |
1621 | * the complete and validated header. Caller can pass the address | |
1622 | * of a variable that will be filled in with the version of the | |
1623 | * header object at the time it was read. | |
1624 | * | |
1625 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1626 | */ |
4156d998 AE |
1627 | static struct rbd_image_header_ondisk * |
1628 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1629 | { |
4156d998 | 1630 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1631 | u32 snap_count = 0; |
4156d998 AE |
1632 | u64 names_size = 0; |
1633 | u32 want_count; | |
1634 | int ret; | |
602adf40 | 1635 | |
00f1f36f | 1636 | /* |
4156d998 AE |
1637 | * The complete header will include an array of its 64-bit |
1638 | * snapshot ids, followed by the names of those snapshots as | |
1639 | * a contiguous block of NUL-terminated strings. Note that | |
1640 | * the number of snapshots could change by the time we read | |
1641 | * it in, in which case we re-read it. | |
00f1f36f | 1642 | */ |
4156d998 AE |
1643 | do { |
1644 | size_t size; | |
1645 | ||
1646 | kfree(ondisk); | |
1647 | ||
1648 | size = sizeof (*ondisk); | |
1649 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1650 | size += names_size; | |
1651 | ondisk = kmalloc(size, GFP_KERNEL); | |
1652 | if (!ondisk) | |
1653 | return ERR_PTR(-ENOMEM); | |
1654 | ||
1655 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1656 | rbd_dev->header_name, |
4156d998 AE |
1657 | 0, size, |
1658 | (char *) ondisk, version); | |
1659 | ||
1660 | if (ret < 0) | |
1661 | goto out_err; | |
1662 | if (WARN_ON((size_t) ret < size)) { | |
1663 | ret = -ENXIO; | |
1664 | pr_warning("short header read for image %s" | |
1665 | " (want %zd got %d)\n", | |
1666 | rbd_dev->image_name, size, ret); | |
1667 | goto out_err; | |
1668 | } | |
1669 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1670 | ret = -ENXIO; | |
1671 | pr_warning("invalid header for image %s\n", | |
1672 | rbd_dev->image_name); | |
1673 | goto out_err; | |
81e759fb | 1674 | } |
602adf40 | 1675 | |
4156d998 AE |
1676 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1677 | want_count = snap_count; | |
1678 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1679 | } while (snap_count != want_count); | |
00f1f36f | 1680 | |
4156d998 | 1681 | return ondisk; |
00f1f36f | 1682 | |
4156d998 AE |
1683 | out_err: |
1684 | kfree(ondisk); | |
1685 | ||
1686 | return ERR_PTR(ret); | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * reload the ondisk the header | |
1691 | */ | |
1692 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1693 | struct rbd_image_header *header) | |
1694 | { | |
1695 | struct rbd_image_header_ondisk *ondisk; | |
1696 | u64 ver = 0; | |
1697 | int ret; | |
602adf40 | 1698 | |
4156d998 AE |
1699 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1700 | if (IS_ERR(ondisk)) | |
1701 | return PTR_ERR(ondisk); | |
1702 | ret = rbd_header_from_disk(header, ondisk); | |
1703 | if (ret >= 0) | |
1704 | header->obj_version = ver; | |
1705 | kfree(ondisk); | |
1706 | ||
1707 | return ret; | |
602adf40 YS |
1708 | } |
1709 | ||
dfc5606d YS |
1710 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1711 | { | |
1712 | struct rbd_snap *snap; | |
a0593290 | 1713 | struct rbd_snap *next; |
dfc5606d | 1714 | |
a0593290 | 1715 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1716 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1717 | } |
1718 | ||
9478554a AE |
1719 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
1720 | { | |
1721 | sector_t size; | |
1722 | ||
1723 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP) | |
1724 | return; | |
1725 | ||
1726 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
1727 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1728 | rbd_dev->mapping.size = (u64) size; | |
1729 | set_capacity(rbd_dev->disk, size); | |
1730 | } | |
1731 | ||
602adf40 YS |
1732 | /* |
1733 | * only read the first part of the ondisk header, without the snaps info | |
1734 | */ | |
b813623a | 1735 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1736 | { |
1737 | int ret; | |
1738 | struct rbd_image_header h; | |
602adf40 YS |
1739 | |
1740 | ret = rbd_read_header(rbd_dev, &h); | |
1741 | if (ret < 0) | |
1742 | return ret; | |
1743 | ||
a51aa0c0 JD |
1744 | down_write(&rbd_dev->header_rwsem); |
1745 | ||
9478554a AE |
1746 | /* Update image size, and check for resize of mapped image */ |
1747 | rbd_dev->header.image_size = h.image_size; | |
1748 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 1749 | |
849b4260 | 1750 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1751 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1752 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1753 | /* osd requests may still refer to snapc */ |
1754 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1755 | |
b813623a AE |
1756 | if (hver) |
1757 | *hver = h.obj_version; | |
a71b891b | 1758 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1759 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1760 | rbd_dev->header.snapc = h.snapc; |
1761 | rbd_dev->header.snap_names = h.snap_names; | |
1762 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1763 | /* Free the extra copy of the object prefix */ |
1764 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1765 | kfree(h.object_prefix); | |
1766 | ||
304f6808 AE |
1767 | ret = rbd_dev_snaps_update(rbd_dev); |
1768 | if (!ret) | |
1769 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 1770 | |
c666601a | 1771 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1772 | |
dfc5606d | 1773 | return ret; |
602adf40 YS |
1774 | } |
1775 | ||
1fe5e993 AE |
1776 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1777 | { | |
1778 | int ret; | |
1779 | ||
1780 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1781 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1782 | mutex_unlock(&ctl_mutex); | |
1783 | ||
1784 | return ret; | |
1785 | } | |
1786 | ||
602adf40 YS |
1787 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1788 | { | |
1789 | struct gendisk *disk; | |
1790 | struct request_queue *q; | |
593a9e7b | 1791 | u64 segment_size; |
602adf40 | 1792 | |
602adf40 | 1793 | /* create gendisk info */ |
602adf40 YS |
1794 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
1795 | if (!disk) | |
1fcdb8aa | 1796 | return -ENOMEM; |
602adf40 | 1797 | |
f0f8cef5 | 1798 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1799 | rbd_dev->dev_id); |
602adf40 YS |
1800 | disk->major = rbd_dev->major; |
1801 | disk->first_minor = 0; | |
1802 | disk->fops = &rbd_bd_ops; | |
1803 | disk->private_data = rbd_dev; | |
1804 | ||
1805 | /* init rq */ | |
602adf40 YS |
1806 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
1807 | if (!q) | |
1808 | goto out_disk; | |
029bcbd8 | 1809 | |
593a9e7b AE |
1810 | /* We use the default size, but let's be explicit about it. */ |
1811 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1812 | ||
029bcbd8 | 1813 | /* set io sizes to object size */ |
593a9e7b AE |
1814 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1815 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1816 | blk_queue_max_segment_size(q, segment_size); | |
1817 | blk_queue_io_min(q, segment_size); | |
1818 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1819 | |
602adf40 YS |
1820 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1821 | disk->queue = q; | |
1822 | ||
1823 | q->queuedata = rbd_dev; | |
1824 | ||
1825 | rbd_dev->disk = disk; | |
602adf40 | 1826 | |
12f02944 AE |
1827 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
1828 | ||
602adf40 | 1829 | return 0; |
602adf40 YS |
1830 | out_disk: |
1831 | put_disk(disk); | |
1fcdb8aa AE |
1832 | |
1833 | return -ENOMEM; | |
602adf40 YS |
1834 | } |
1835 | ||
dfc5606d YS |
1836 | /* |
1837 | sysfs | |
1838 | */ | |
1839 | ||
593a9e7b AE |
1840 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1841 | { | |
1842 | return container_of(dev, struct rbd_device, dev); | |
1843 | } | |
1844 | ||
dfc5606d YS |
1845 | static ssize_t rbd_size_show(struct device *dev, |
1846 | struct device_attribute *attr, char *buf) | |
1847 | { | |
593a9e7b | 1848 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1849 | sector_t size; |
1850 | ||
1851 | down_read(&rbd_dev->header_rwsem); | |
1852 | size = get_capacity(rbd_dev->disk); | |
1853 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1854 | |
a51aa0c0 | 1855 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1856 | } |
1857 | ||
34b13184 AE |
1858 | /* |
1859 | * Note this shows the features for whatever's mapped, which is not | |
1860 | * necessarily the base image. | |
1861 | */ | |
1862 | static ssize_t rbd_features_show(struct device *dev, | |
1863 | struct device_attribute *attr, char *buf) | |
1864 | { | |
1865 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1866 | ||
1867 | return sprintf(buf, "0x%016llx\n", | |
1868 | (unsigned long long) rbd_dev->mapping.features); | |
1869 | } | |
1870 | ||
dfc5606d YS |
1871 | static ssize_t rbd_major_show(struct device *dev, |
1872 | struct device_attribute *attr, char *buf) | |
1873 | { | |
593a9e7b | 1874 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1875 | |
dfc5606d YS |
1876 | return sprintf(buf, "%d\n", rbd_dev->major); |
1877 | } | |
1878 | ||
1879 | static ssize_t rbd_client_id_show(struct device *dev, | |
1880 | struct device_attribute *attr, char *buf) | |
602adf40 | 1881 | { |
593a9e7b | 1882 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1883 | |
1dbb4399 AE |
1884 | return sprintf(buf, "client%lld\n", |
1885 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1886 | } |
1887 | ||
dfc5606d YS |
1888 | static ssize_t rbd_pool_show(struct device *dev, |
1889 | struct device_attribute *attr, char *buf) | |
602adf40 | 1890 | { |
593a9e7b | 1891 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1892 | |
1893 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1894 | } | |
1895 | ||
9bb2f334 AE |
1896 | static ssize_t rbd_pool_id_show(struct device *dev, |
1897 | struct device_attribute *attr, char *buf) | |
1898 | { | |
1899 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1900 | ||
1901 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1902 | } | |
1903 | ||
dfc5606d YS |
1904 | static ssize_t rbd_name_show(struct device *dev, |
1905 | struct device_attribute *attr, char *buf) | |
1906 | { | |
593a9e7b | 1907 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1908 | |
0bed54dc | 1909 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1910 | } |
1911 | ||
589d30e0 AE |
1912 | static ssize_t rbd_image_id_show(struct device *dev, |
1913 | struct device_attribute *attr, char *buf) | |
1914 | { | |
1915 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1916 | ||
1917 | return sprintf(buf, "%s\n", rbd_dev->image_id); | |
1918 | } | |
1919 | ||
34b13184 AE |
1920 | /* |
1921 | * Shows the name of the currently-mapped snapshot (or | |
1922 | * RBD_SNAP_HEAD_NAME for the base image). | |
1923 | */ | |
dfc5606d YS |
1924 | static ssize_t rbd_snap_show(struct device *dev, |
1925 | struct device_attribute *attr, | |
1926 | char *buf) | |
1927 | { | |
593a9e7b | 1928 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1929 | |
f84344f3 | 1930 | return sprintf(buf, "%s\n", rbd_dev->mapping.snap_name); |
dfc5606d YS |
1931 | } |
1932 | ||
1933 | static ssize_t rbd_image_refresh(struct device *dev, | |
1934 | struct device_attribute *attr, | |
1935 | const char *buf, | |
1936 | size_t size) | |
1937 | { | |
593a9e7b | 1938 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1939 | int ret; |
602adf40 | 1940 | |
1fe5e993 | 1941 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1942 | |
1943 | return ret < 0 ? ret : size; | |
dfc5606d | 1944 | } |
602adf40 | 1945 | |
dfc5606d | 1946 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 1947 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
1948 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
1949 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1950 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1951 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 1952 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 1953 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
1954 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
1955 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
dfc5606d YS |
1956 | |
1957 | static struct attribute *rbd_attrs[] = { | |
1958 | &dev_attr_size.attr, | |
34b13184 | 1959 | &dev_attr_features.attr, |
dfc5606d YS |
1960 | &dev_attr_major.attr, |
1961 | &dev_attr_client_id.attr, | |
1962 | &dev_attr_pool.attr, | |
9bb2f334 | 1963 | &dev_attr_pool_id.attr, |
dfc5606d | 1964 | &dev_attr_name.attr, |
589d30e0 | 1965 | &dev_attr_image_id.attr, |
dfc5606d YS |
1966 | &dev_attr_current_snap.attr, |
1967 | &dev_attr_refresh.attr, | |
dfc5606d YS |
1968 | NULL |
1969 | }; | |
1970 | ||
1971 | static struct attribute_group rbd_attr_group = { | |
1972 | .attrs = rbd_attrs, | |
1973 | }; | |
1974 | ||
1975 | static const struct attribute_group *rbd_attr_groups[] = { | |
1976 | &rbd_attr_group, | |
1977 | NULL | |
1978 | }; | |
1979 | ||
1980 | static void rbd_sysfs_dev_release(struct device *dev) | |
1981 | { | |
1982 | } | |
1983 | ||
1984 | static struct device_type rbd_device_type = { | |
1985 | .name = "rbd", | |
1986 | .groups = rbd_attr_groups, | |
1987 | .release = rbd_sysfs_dev_release, | |
1988 | }; | |
1989 | ||
1990 | ||
1991 | /* | |
1992 | sysfs - snapshots | |
1993 | */ | |
1994 | ||
1995 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1996 | struct device_attribute *attr, | |
1997 | char *buf) | |
1998 | { | |
1999 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2000 | ||
3591538f | 2001 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2002 | } |
2003 | ||
2004 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2005 | struct device_attribute *attr, | |
2006 | char *buf) | |
2007 | { | |
2008 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2009 | ||
3591538f | 2010 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2011 | } |
2012 | ||
34b13184 AE |
2013 | static ssize_t rbd_snap_features_show(struct device *dev, |
2014 | struct device_attribute *attr, | |
2015 | char *buf) | |
2016 | { | |
2017 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2018 | ||
2019 | return sprintf(buf, "0x%016llx\n", | |
2020 | (unsigned long long) snap->features); | |
2021 | } | |
2022 | ||
dfc5606d YS |
2023 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2024 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 2025 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
2026 | |
2027 | static struct attribute *rbd_snap_attrs[] = { | |
2028 | &dev_attr_snap_size.attr, | |
2029 | &dev_attr_snap_id.attr, | |
34b13184 | 2030 | &dev_attr_snap_features.attr, |
dfc5606d YS |
2031 | NULL, |
2032 | }; | |
2033 | ||
2034 | static struct attribute_group rbd_snap_attr_group = { | |
2035 | .attrs = rbd_snap_attrs, | |
2036 | }; | |
2037 | ||
2038 | static void rbd_snap_dev_release(struct device *dev) | |
2039 | { | |
2040 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2041 | kfree(snap->name); | |
2042 | kfree(snap); | |
2043 | } | |
2044 | ||
2045 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2046 | &rbd_snap_attr_group, | |
2047 | NULL | |
2048 | }; | |
2049 | ||
2050 | static struct device_type rbd_snap_device_type = { | |
2051 | .groups = rbd_snap_attr_groups, | |
2052 | .release = rbd_snap_dev_release, | |
2053 | }; | |
2054 | ||
304f6808 AE |
2055 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2056 | { | |
2057 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
2058 | bool reg = device_is_registered(&snap->dev); | |
2059 | ||
2060 | rbd_assert(!ret ^ reg); | |
2061 | ||
2062 | return ret; | |
2063 | } | |
2064 | ||
14e7085d | 2065 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2066 | { |
2067 | list_del(&snap->node); | |
304f6808 AE |
2068 | if (device_is_registered(&snap->dev)) |
2069 | device_unregister(&snap->dev); | |
dfc5606d YS |
2070 | } |
2071 | ||
14e7085d | 2072 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2073 | struct device *parent) |
2074 | { | |
2075 | struct device *dev = &snap->dev; | |
2076 | int ret; | |
2077 | ||
2078 | dev->type = &rbd_snap_device_type; | |
2079 | dev->parent = parent; | |
2080 | dev->release = rbd_snap_dev_release; | |
2081 | dev_set_name(dev, "snap_%s", snap->name); | |
304f6808 AE |
2082 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2083 | ||
dfc5606d YS |
2084 | ret = device_register(dev); |
2085 | ||
2086 | return ret; | |
2087 | } | |
2088 | ||
4e891e0a | 2089 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 2090 | const char *snap_name, |
34b13184 AE |
2091 | u64 snap_id, u64 snap_size, |
2092 | u64 snap_features) | |
dfc5606d | 2093 | { |
4e891e0a | 2094 | struct rbd_snap *snap; |
dfc5606d | 2095 | int ret; |
4e891e0a AE |
2096 | |
2097 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2098 | if (!snap) |
4e891e0a AE |
2099 | return ERR_PTR(-ENOMEM); |
2100 | ||
2101 | ret = -ENOMEM; | |
c8d18425 | 2102 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
2103 | if (!snap->name) |
2104 | goto err; | |
2105 | ||
c8d18425 AE |
2106 | snap->id = snap_id; |
2107 | snap->size = snap_size; | |
34b13184 | 2108 | snap->features = snap_features; |
4e891e0a AE |
2109 | |
2110 | return snap; | |
2111 | ||
dfc5606d YS |
2112 | err: |
2113 | kfree(snap->name); | |
2114 | kfree(snap); | |
4e891e0a AE |
2115 | |
2116 | return ERR_PTR(ret); | |
dfc5606d YS |
2117 | } |
2118 | ||
cd892126 AE |
2119 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2120 | u64 *snap_size, u64 *snap_features) | |
2121 | { | |
2122 | char *snap_name; | |
2123 | ||
2124 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
2125 | ||
2126 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
2127 | *snap_features = 0; /* No features for v1 */ | |
2128 | ||
2129 | /* Skip over names until we find the one we are looking for */ | |
2130 | ||
2131 | snap_name = rbd_dev->header.snap_names; | |
2132 | while (which--) | |
2133 | snap_name += strlen(snap_name) + 1; | |
2134 | ||
2135 | return snap_name; | |
2136 | } | |
2137 | ||
9d475de5 AE |
2138 | /* |
2139 | * Get the size and object order for an image snapshot, or if | |
2140 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
2141 | * image. | |
2142 | */ | |
2143 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
2144 | u8 *order, u64 *snap_size) | |
2145 | { | |
2146 | __le64 snapid = cpu_to_le64(snap_id); | |
2147 | int ret; | |
2148 | struct { | |
2149 | u8 order; | |
2150 | __le64 size; | |
2151 | } __attribute__ ((packed)) size_buf = { 0 }; | |
2152 | ||
2153 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2154 | "rbd", "get_size", | |
2155 | (char *) &snapid, sizeof (snapid), | |
2156 | (char *) &size_buf, sizeof (size_buf), | |
2157 | CEPH_OSD_FLAG_READ, NULL); | |
2158 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2159 | if (ret < 0) | |
2160 | return ret; | |
2161 | ||
2162 | *order = size_buf.order; | |
2163 | *snap_size = le64_to_cpu(size_buf.size); | |
2164 | ||
2165 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
2166 | (unsigned long long) snap_id, (unsigned int) *order, | |
2167 | (unsigned long long) *snap_size); | |
2168 | ||
2169 | return 0; | |
2170 | } | |
2171 | ||
2172 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
2173 | { | |
2174 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
2175 | &rbd_dev->header.obj_order, | |
2176 | &rbd_dev->header.image_size); | |
2177 | } | |
2178 | ||
1e130199 AE |
2179 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2180 | { | |
2181 | void *reply_buf; | |
2182 | int ret; | |
2183 | void *p; | |
2184 | ||
2185 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
2186 | if (!reply_buf) | |
2187 | return -ENOMEM; | |
2188 | ||
2189 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2190 | "rbd", "get_object_prefix", | |
2191 | NULL, 0, | |
2192 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, | |
2193 | CEPH_OSD_FLAG_READ, NULL); | |
2194 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2195 | if (ret < 0) | |
2196 | goto out; | |
2197 | ||
2198 | p = reply_buf; | |
2199 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
2200 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
2201 | NULL, GFP_NOIO); | |
2202 | ||
2203 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
2204 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
2205 | rbd_dev->header.object_prefix = NULL; | |
2206 | } else { | |
2207 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
2208 | } | |
2209 | ||
2210 | out: | |
2211 | kfree(reply_buf); | |
2212 | ||
2213 | return ret; | |
2214 | } | |
2215 | ||
b1b5402a AE |
2216 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2217 | u64 *snap_features) | |
2218 | { | |
2219 | __le64 snapid = cpu_to_le64(snap_id); | |
2220 | struct { | |
2221 | __le64 features; | |
2222 | __le64 incompat; | |
2223 | } features_buf = { 0 }; | |
2224 | int ret; | |
2225 | ||
2226 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2227 | "rbd", "get_features", | |
2228 | (char *) &snapid, sizeof (snapid), | |
2229 | (char *) &features_buf, sizeof (features_buf), | |
2230 | CEPH_OSD_FLAG_READ, NULL); | |
2231 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2232 | if (ret < 0) | |
2233 | return ret; | |
2234 | *snap_features = le64_to_cpu(features_buf.features); | |
2235 | ||
2236 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
2237 | (unsigned long long) snap_id, | |
2238 | (unsigned long long) *snap_features, | |
2239 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
2240 | ||
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
2245 | { | |
2246 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
2247 | &rbd_dev->header.features); | |
2248 | } | |
2249 | ||
6e14b1a6 | 2250 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
2251 | { |
2252 | size_t size; | |
2253 | int ret; | |
2254 | void *reply_buf; | |
2255 | void *p; | |
2256 | void *end; | |
2257 | u64 seq; | |
2258 | u32 snap_count; | |
2259 | struct ceph_snap_context *snapc; | |
2260 | u32 i; | |
2261 | ||
2262 | /* | |
2263 | * We'll need room for the seq value (maximum snapshot id), | |
2264 | * snapshot count, and array of that many snapshot ids. | |
2265 | * For now we have a fixed upper limit on the number we're | |
2266 | * prepared to receive. | |
2267 | */ | |
2268 | size = sizeof (__le64) + sizeof (__le32) + | |
2269 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
2270 | reply_buf = kzalloc(size, GFP_KERNEL); | |
2271 | if (!reply_buf) | |
2272 | return -ENOMEM; | |
2273 | ||
2274 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2275 | "rbd", "get_snapcontext", | |
2276 | NULL, 0, | |
2277 | reply_buf, size, | |
6e14b1a6 | 2278 | CEPH_OSD_FLAG_READ, ver); |
35d489f9 AE |
2279 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); |
2280 | if (ret < 0) | |
2281 | goto out; | |
2282 | ||
2283 | ret = -ERANGE; | |
2284 | p = reply_buf; | |
2285 | end = (char *) reply_buf + size; | |
2286 | ceph_decode_64_safe(&p, end, seq, out); | |
2287 | ceph_decode_32_safe(&p, end, snap_count, out); | |
2288 | ||
2289 | /* | |
2290 | * Make sure the reported number of snapshot ids wouldn't go | |
2291 | * beyond the end of our buffer. But before checking that, | |
2292 | * make sure the computed size of the snapshot context we | |
2293 | * allocate is representable in a size_t. | |
2294 | */ | |
2295 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
2296 | / sizeof (u64)) { | |
2297 | ret = -EINVAL; | |
2298 | goto out; | |
2299 | } | |
2300 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
2301 | goto out; | |
2302 | ||
2303 | size = sizeof (struct ceph_snap_context) + | |
2304 | snap_count * sizeof (snapc->snaps[0]); | |
2305 | snapc = kmalloc(size, GFP_KERNEL); | |
2306 | if (!snapc) { | |
2307 | ret = -ENOMEM; | |
2308 | goto out; | |
2309 | } | |
2310 | ||
2311 | atomic_set(&snapc->nref, 1); | |
2312 | snapc->seq = seq; | |
2313 | snapc->num_snaps = snap_count; | |
2314 | for (i = 0; i < snap_count; i++) | |
2315 | snapc->snaps[i] = ceph_decode_64(&p); | |
2316 | ||
2317 | rbd_dev->header.snapc = snapc; | |
2318 | ||
2319 | dout(" snap context seq = %llu, snap_count = %u\n", | |
2320 | (unsigned long long) seq, (unsigned int) snap_count); | |
2321 | ||
2322 | out: | |
2323 | kfree(reply_buf); | |
2324 | ||
2325 | return 0; | |
2326 | } | |
2327 | ||
b8b1e2db AE |
2328 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
2329 | { | |
2330 | size_t size; | |
2331 | void *reply_buf; | |
2332 | __le64 snap_id; | |
2333 | int ret; | |
2334 | void *p; | |
2335 | void *end; | |
2336 | size_t snap_name_len; | |
2337 | char *snap_name; | |
2338 | ||
2339 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
2340 | reply_buf = kmalloc(size, GFP_KERNEL); | |
2341 | if (!reply_buf) | |
2342 | return ERR_PTR(-ENOMEM); | |
2343 | ||
2344 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
2345 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2346 | "rbd", "get_snapshot_name", | |
2347 | (char *) &snap_id, sizeof (snap_id), | |
2348 | reply_buf, size, | |
2349 | CEPH_OSD_FLAG_READ, NULL); | |
2350 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2351 | if (ret < 0) | |
2352 | goto out; | |
2353 | ||
2354 | p = reply_buf; | |
2355 | end = (char *) reply_buf + size; | |
2356 | snap_name_len = 0; | |
2357 | snap_name = ceph_extract_encoded_string(&p, end, &snap_name_len, | |
2358 | GFP_KERNEL); | |
2359 | if (IS_ERR(snap_name)) { | |
2360 | ret = PTR_ERR(snap_name); | |
2361 | goto out; | |
2362 | } else { | |
2363 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
2364 | (unsigned long long) le64_to_cpu(snap_id), snap_name); | |
2365 | } | |
2366 | kfree(reply_buf); | |
2367 | ||
2368 | return snap_name; | |
2369 | out: | |
2370 | kfree(reply_buf); | |
2371 | ||
2372 | return ERR_PTR(ret); | |
2373 | } | |
2374 | ||
2375 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2376 | u64 *snap_size, u64 *snap_features) | |
2377 | { | |
2378 | __le64 snap_id; | |
2379 | u8 order; | |
2380 | int ret; | |
2381 | ||
2382 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
2383 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
2384 | if (ret) | |
2385 | return ERR_PTR(ret); | |
2386 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
2387 | if (ret) | |
2388 | return ERR_PTR(ret); | |
2389 | ||
2390 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
2391 | } | |
2392 | ||
2393 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2394 | u64 *snap_size, u64 *snap_features) | |
2395 | { | |
2396 | if (rbd_dev->image_format == 1) | |
2397 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
2398 | snap_size, snap_features); | |
2399 | if (rbd_dev->image_format == 2) | |
2400 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
2401 | snap_size, snap_features); | |
2402 | return ERR_PTR(-EINVAL); | |
2403 | } | |
2404 | ||
dfc5606d | 2405 | /* |
35938150 AE |
2406 | * Scan the rbd device's current snapshot list and compare it to the |
2407 | * newly-received snapshot context. Remove any existing snapshots | |
2408 | * not present in the new snapshot context. Add a new snapshot for | |
2409 | * any snaphots in the snapshot context not in the current list. | |
2410 | * And verify there are no changes to snapshots we already know | |
2411 | * about. | |
2412 | * | |
2413 | * Assumes the snapshots in the snapshot context are sorted by | |
2414 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2415 | * are also maintained in that order.) | |
dfc5606d | 2416 | */ |
304f6808 | 2417 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 2418 | { |
35938150 AE |
2419 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2420 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
2421 | struct list_head *head = &rbd_dev->snaps; |
2422 | struct list_head *links = head->next; | |
2423 | u32 index = 0; | |
dfc5606d | 2424 | |
9fcbb800 | 2425 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
2426 | while (index < snap_count || links != head) { |
2427 | u64 snap_id; | |
2428 | struct rbd_snap *snap; | |
cd892126 AE |
2429 | char *snap_name; |
2430 | u64 snap_size = 0; | |
2431 | u64 snap_features = 0; | |
dfc5606d | 2432 | |
35938150 AE |
2433 | snap_id = index < snap_count ? snapc->snaps[index] |
2434 | : CEPH_NOSNAP; | |
2435 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2436 | : NULL; | |
aafb230e | 2437 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 2438 | |
35938150 AE |
2439 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2440 | struct list_head *next = links->next; | |
dfc5606d | 2441 | |
35938150 | 2442 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2443 | |
f84344f3 AE |
2444 | if (rbd_dev->mapping.snap_id == snap->id) |
2445 | rbd_dev->mapping.snap_exists = false; | |
35938150 | 2446 | __rbd_remove_snap_dev(snap); |
9fcbb800 | 2447 | dout("%ssnap id %llu has been removed\n", |
f84344f3 AE |
2448 | rbd_dev->mapping.snap_id == snap->id ? |
2449 | "mapped " : "", | |
9fcbb800 | 2450 | (unsigned long long) snap->id); |
35938150 AE |
2451 | |
2452 | /* Done with this list entry; advance */ | |
2453 | ||
2454 | links = next; | |
dfc5606d YS |
2455 | continue; |
2456 | } | |
35938150 | 2457 | |
b8b1e2db AE |
2458 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
2459 | &snap_size, &snap_features); | |
cd892126 AE |
2460 | if (IS_ERR(snap_name)) |
2461 | return PTR_ERR(snap_name); | |
2462 | ||
9fcbb800 AE |
2463 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
2464 | (unsigned long long) snap_id); | |
35938150 AE |
2465 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
2466 | struct rbd_snap *new_snap; | |
2467 | ||
2468 | /* We haven't seen this snapshot before */ | |
2469 | ||
c8d18425 | 2470 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 2471 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
2472 | if (IS_ERR(new_snap)) { |
2473 | int err = PTR_ERR(new_snap); | |
2474 | ||
2475 | dout(" failed to add dev, error %d\n", err); | |
2476 | ||
2477 | return err; | |
2478 | } | |
35938150 AE |
2479 | |
2480 | /* New goes before existing, or at end of list */ | |
2481 | ||
9fcbb800 | 2482 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
2483 | if (snap) |
2484 | list_add_tail(&new_snap->node, &snap->node); | |
2485 | else | |
523f3258 | 2486 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2487 | } else { |
2488 | /* Already have this one */ | |
2489 | ||
9fcbb800 AE |
2490 | dout(" already present\n"); |
2491 | ||
cd892126 | 2492 | rbd_assert(snap->size == snap_size); |
aafb230e | 2493 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 2494 | rbd_assert(snap->features == snap_features); |
35938150 AE |
2495 | |
2496 | /* Done with this list entry; advance */ | |
2497 | ||
2498 | links = links->next; | |
dfc5606d | 2499 | } |
35938150 AE |
2500 | |
2501 | /* Advance to the next entry in the snapshot context */ | |
2502 | ||
2503 | index++; | |
dfc5606d | 2504 | } |
9fcbb800 | 2505 | dout("%s: done\n", __func__); |
dfc5606d YS |
2506 | |
2507 | return 0; | |
2508 | } | |
2509 | ||
304f6808 AE |
2510 | /* |
2511 | * Scan the list of snapshots and register the devices for any that | |
2512 | * have not already been registered. | |
2513 | */ | |
2514 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
2515 | { | |
2516 | struct rbd_snap *snap; | |
2517 | int ret = 0; | |
2518 | ||
2519 | dout("%s called\n", __func__); | |
86ff77bb AE |
2520 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
2521 | return -EIO; | |
304f6808 AE |
2522 | |
2523 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2524 | if (!rbd_snap_registered(snap)) { | |
2525 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
2526 | if (ret < 0) | |
2527 | break; | |
2528 | } | |
2529 | } | |
2530 | dout("%s: returning %d\n", __func__, ret); | |
2531 | ||
2532 | return ret; | |
2533 | } | |
2534 | ||
dfc5606d YS |
2535 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2536 | { | |
dfc5606d | 2537 | struct device *dev; |
cd789ab9 | 2538 | int ret; |
dfc5606d YS |
2539 | |
2540 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 2541 | |
cd789ab9 | 2542 | dev = &rbd_dev->dev; |
dfc5606d YS |
2543 | dev->bus = &rbd_bus_type; |
2544 | dev->type = &rbd_device_type; | |
2545 | dev->parent = &rbd_root_dev; | |
2546 | dev->release = rbd_dev_release; | |
de71a297 | 2547 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 2548 | ret = device_register(dev); |
dfc5606d | 2549 | |
dfc5606d | 2550 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 2551 | |
dfc5606d | 2552 | return ret; |
602adf40 YS |
2553 | } |
2554 | ||
dfc5606d YS |
2555 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2556 | { | |
2557 | device_unregister(&rbd_dev->dev); | |
2558 | } | |
2559 | ||
59c2be1e YS |
2560 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2561 | { | |
2562 | int ret, rc; | |
2563 | ||
2564 | do { | |
0e6f322d | 2565 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2566 | if (ret == -ERANGE) { |
1fe5e993 | 2567 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2568 | if (rc < 0) |
2569 | return rc; | |
2570 | } | |
2571 | } while (ret == -ERANGE); | |
2572 | ||
2573 | return ret; | |
2574 | } | |
2575 | ||
e2839308 | 2576 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
2577 | |
2578 | /* | |
499afd5b AE |
2579 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2580 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2581 | */ |
e2839308 | 2582 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2583 | { |
e2839308 | 2584 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
2585 | |
2586 | spin_lock(&rbd_dev_list_lock); | |
2587 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2588 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
2589 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
2590 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 2591 | } |
b7f23c36 | 2592 | |
1ddbe94e | 2593 | /* |
499afd5b AE |
2594 | * Remove an rbd_dev from the global list, and record that its |
2595 | * identifier is no longer in use. | |
1ddbe94e | 2596 | */ |
e2839308 | 2597 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2598 | { |
d184f6bf | 2599 | struct list_head *tmp; |
de71a297 | 2600 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2601 | int max_id; |
2602 | ||
aafb230e | 2603 | rbd_assert(rbd_id > 0); |
499afd5b | 2604 | |
e2839308 AE |
2605 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
2606 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
2607 | spin_lock(&rbd_dev_list_lock); |
2608 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2609 | |
2610 | /* | |
2611 | * If the id being "put" is not the current maximum, there | |
2612 | * is nothing special we need to do. | |
2613 | */ | |
e2839308 | 2614 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
2615 | spin_unlock(&rbd_dev_list_lock); |
2616 | return; | |
2617 | } | |
2618 | ||
2619 | /* | |
2620 | * We need to update the current maximum id. Search the | |
2621 | * list to find out what it is. We're more likely to find | |
2622 | * the maximum at the end, so search the list backward. | |
2623 | */ | |
2624 | max_id = 0; | |
2625 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2626 | struct rbd_device *rbd_dev; | |
2627 | ||
2628 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2629 | if (rbd_id > max_id) | |
2630 | max_id = rbd_id; | |
2631 | } | |
499afd5b | 2632 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2633 | |
1ddbe94e | 2634 | /* |
e2839308 | 2635 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
2636 | * which case it now accurately reflects the new maximum. |
2637 | * Be careful not to overwrite the maximum value in that | |
2638 | * case. | |
1ddbe94e | 2639 | */ |
e2839308 AE |
2640 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
2641 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
2642 | } |
2643 | ||
e28fff26 AE |
2644 | /* |
2645 | * Skips over white space at *buf, and updates *buf to point to the | |
2646 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2647 | * the token (string of non-white space characters) found. Note |
2648 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2649 | */ |
2650 | static inline size_t next_token(const char **buf) | |
2651 | { | |
2652 | /* | |
2653 | * These are the characters that produce nonzero for | |
2654 | * isspace() in the "C" and "POSIX" locales. | |
2655 | */ | |
2656 | const char *spaces = " \f\n\r\t\v"; | |
2657 | ||
2658 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2659 | ||
2660 | return strcspn(*buf, spaces); /* Return token length */ | |
2661 | } | |
2662 | ||
2663 | /* | |
2664 | * Finds the next token in *buf, and if the provided token buffer is | |
2665 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2666 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2667 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2668 | * |
2669 | * Returns the length of the token found (not including the '\0'). | |
2670 | * Return value will be 0 if no token is found, and it will be >= | |
2671 | * token_size if the token would not fit. | |
2672 | * | |
593a9e7b | 2673 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2674 | * found token. Note that this occurs even if the token buffer is |
2675 | * too small to hold it. | |
2676 | */ | |
2677 | static inline size_t copy_token(const char **buf, | |
2678 | char *token, | |
2679 | size_t token_size) | |
2680 | { | |
2681 | size_t len; | |
2682 | ||
2683 | len = next_token(buf); | |
2684 | if (len < token_size) { | |
2685 | memcpy(token, *buf, len); | |
2686 | *(token + len) = '\0'; | |
2687 | } | |
2688 | *buf += len; | |
2689 | ||
2690 | return len; | |
2691 | } | |
2692 | ||
ea3352f4 AE |
2693 | /* |
2694 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2695 | * enough to hold a copy of it, and copies the token into the new | |
2696 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2697 | * that a duplicate buffer is created even for a zero-length token. | |
2698 | * | |
2699 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2700 | * pointer if memory for the duplicate was not available. If | |
2701 | * the lenp argument is a non-null pointer, the length of the token | |
2702 | * (not including the '\0') is returned in *lenp. | |
2703 | * | |
2704 | * If successful, the *buf pointer will be updated to point beyond | |
2705 | * the end of the found token. | |
2706 | * | |
2707 | * Note: uses GFP_KERNEL for allocation. | |
2708 | */ | |
2709 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2710 | { | |
2711 | char *dup; | |
2712 | size_t len; | |
2713 | ||
2714 | len = next_token(buf); | |
2715 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2716 | if (!dup) | |
2717 | return NULL; | |
2718 | ||
2719 | memcpy(dup, *buf, len); | |
2720 | *(dup + len) = '\0'; | |
2721 | *buf += len; | |
2722 | ||
2723 | if (lenp) | |
2724 | *lenp = len; | |
2725 | ||
2726 | return dup; | |
2727 | } | |
2728 | ||
a725f65e | 2729 | /* |
3feeb894 AE |
2730 | * This fills in the pool_name, image_name, image_name_len, rbd_dev, |
2731 | * rbd_md_name, and name fields of the given rbd_dev, based on the | |
2732 | * list of monitor addresses and other options provided via | |
2733 | * /sys/bus/rbd/add. Returns a pointer to a dynamically-allocated | |
2734 | * copy of the snapshot name to map if successful, or a | |
2735 | * pointer-coded error otherwise. | |
d22f76e7 AE |
2736 | * |
2737 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e | 2738 | */ |
3feeb894 AE |
2739 | static char *rbd_add_parse_args(struct rbd_device *rbd_dev, |
2740 | const char *buf, | |
2741 | const char **mon_addrs, | |
2742 | size_t *mon_addrs_size, | |
2743 | char *options, | |
2744 | size_t options_size) | |
e28fff26 | 2745 | { |
d22f76e7 | 2746 | size_t len; |
3feeb894 AE |
2747 | char *err_ptr = ERR_PTR(-EINVAL); |
2748 | char *snap_name; | |
e28fff26 AE |
2749 | |
2750 | /* The first four tokens are required */ | |
2751 | ||
7ef3214a AE |
2752 | len = next_token(&buf); |
2753 | if (!len) | |
3feeb894 | 2754 | return err_ptr; |
5214ecc4 | 2755 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2756 | *mon_addrs = buf; |
2757 | ||
2758 | buf += len; | |
a725f65e | 2759 | |
e28fff26 AE |
2760 | len = copy_token(&buf, options, options_size); |
2761 | if (!len || len >= options_size) | |
3feeb894 | 2762 | return err_ptr; |
e28fff26 | 2763 | |
3feeb894 | 2764 | err_ptr = ERR_PTR(-ENOMEM); |
d22f76e7 AE |
2765 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2766 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2767 | goto out_err; |
e28fff26 | 2768 | |
0bed54dc AE |
2769 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2770 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2771 | goto out_err; |
a725f65e | 2772 | |
3feeb894 AE |
2773 | /* Snapshot name is optional */ |
2774 | len = next_token(&buf); | |
820a5f3e | 2775 | if (!len) { |
3feeb894 AE |
2776 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
2777 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
849b4260 | 2778 | } |
3feeb894 AE |
2779 | snap_name = kmalloc(len + 1, GFP_KERNEL); |
2780 | if (!snap_name) | |
2781 | goto out_err; | |
2782 | memcpy(snap_name, buf, len); | |
2783 | *(snap_name + len) = '\0'; | |
e28fff26 | 2784 | |
3feeb894 AE |
2785 | dout(" SNAP_NAME is <%s>, len is %zd\n", snap_name, len); |
2786 | ||
2787 | return snap_name; | |
d22f76e7 AE |
2788 | |
2789 | out_err: | |
0bed54dc | 2790 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2791 | rbd_dev->image_name = NULL; |
2792 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2793 | kfree(rbd_dev->pool_name); |
2794 | rbd_dev->pool_name = NULL; | |
2795 | ||
3feeb894 | 2796 | return err_ptr; |
a725f65e AE |
2797 | } |
2798 | ||
589d30e0 AE |
2799 | /* |
2800 | * An rbd format 2 image has a unique identifier, distinct from the | |
2801 | * name given to it by the user. Internally, that identifier is | |
2802 | * what's used to specify the names of objects related to the image. | |
2803 | * | |
2804 | * A special "rbd id" object is used to map an rbd image name to its | |
2805 | * id. If that object doesn't exist, then there is no v2 rbd image | |
2806 | * with the supplied name. | |
2807 | * | |
2808 | * This function will record the given rbd_dev's image_id field if | |
2809 | * it can be determined, and in that case will return 0. If any | |
2810 | * errors occur a negative errno will be returned and the rbd_dev's | |
2811 | * image_id field will be unchanged (and should be NULL). | |
2812 | */ | |
2813 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
2814 | { | |
2815 | int ret; | |
2816 | size_t size; | |
2817 | char *object_name; | |
2818 | void *response; | |
2819 | void *p; | |
2820 | ||
2821 | /* | |
2822 | * First, see if the format 2 image id file exists, and if | |
2823 | * so, get the image's persistent id from it. | |
2824 | */ | |
2825 | size = sizeof (RBD_ID_PREFIX) + rbd_dev->image_name_len; | |
2826 | object_name = kmalloc(size, GFP_NOIO); | |
2827 | if (!object_name) | |
2828 | return -ENOMEM; | |
2829 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->image_name); | |
2830 | dout("rbd id object name is %s\n", object_name); | |
2831 | ||
2832 | /* Response will be an encoded string, which includes a length */ | |
2833 | ||
2834 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
2835 | response = kzalloc(size, GFP_NOIO); | |
2836 | if (!response) { | |
2837 | ret = -ENOMEM; | |
2838 | goto out; | |
2839 | } | |
2840 | ||
2841 | ret = rbd_req_sync_exec(rbd_dev, object_name, | |
2842 | "rbd", "get_id", | |
2843 | NULL, 0, | |
2844 | response, RBD_IMAGE_ID_LEN_MAX, | |
2845 | CEPH_OSD_FLAG_READ, NULL); | |
2846 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2847 | if (ret < 0) | |
2848 | goto out; | |
2849 | ||
2850 | p = response; | |
2851 | rbd_dev->image_id = ceph_extract_encoded_string(&p, | |
2852 | p + RBD_IMAGE_ID_LEN_MAX, | |
2853 | &rbd_dev->image_id_len, | |
2854 | GFP_NOIO); | |
2855 | if (IS_ERR(rbd_dev->image_id)) { | |
2856 | ret = PTR_ERR(rbd_dev->image_id); | |
2857 | rbd_dev->image_id = NULL; | |
2858 | } else { | |
2859 | dout("image_id is %s\n", rbd_dev->image_id); | |
2860 | } | |
2861 | out: | |
2862 | kfree(response); | |
2863 | kfree(object_name); | |
2864 | ||
2865 | return ret; | |
2866 | } | |
2867 | ||
a30b71b9 AE |
2868 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
2869 | { | |
2870 | int ret; | |
2871 | size_t size; | |
2872 | ||
2873 | /* Version 1 images have no id; empty string is used */ | |
2874 | ||
2875 | rbd_dev->image_id = kstrdup("", GFP_KERNEL); | |
2876 | if (!rbd_dev->image_id) | |
2877 | return -ENOMEM; | |
2878 | rbd_dev->image_id_len = 0; | |
2879 | ||
2880 | /* Record the header object name for this rbd image. */ | |
2881 | ||
2882 | size = rbd_dev->image_name_len + sizeof (RBD_SUFFIX); | |
2883 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2884 | if (!rbd_dev->header_name) { | |
2885 | ret = -ENOMEM; | |
2886 | goto out_err; | |
2887 | } | |
2888 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); | |
2889 | ||
2890 | /* Populate rbd image metadata */ | |
2891 | ||
2892 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
2893 | if (ret < 0) | |
2894 | goto out_err; | |
2895 | rbd_dev->image_format = 1; | |
2896 | ||
2897 | dout("discovered version 1 image, header name is %s\n", | |
2898 | rbd_dev->header_name); | |
2899 | ||
2900 | return 0; | |
2901 | ||
2902 | out_err: | |
2903 | kfree(rbd_dev->header_name); | |
2904 | rbd_dev->header_name = NULL; | |
2905 | kfree(rbd_dev->image_id); | |
2906 | rbd_dev->image_id = NULL; | |
2907 | ||
2908 | return ret; | |
2909 | } | |
2910 | ||
2911 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
2912 | { | |
2913 | size_t size; | |
9d475de5 | 2914 | int ret; |
6e14b1a6 | 2915 | u64 ver = 0; |
a30b71b9 AE |
2916 | |
2917 | /* | |
2918 | * Image id was filled in by the caller. Record the header | |
2919 | * object name for this rbd image. | |
2920 | */ | |
2921 | size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->image_id_len; | |
2922 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2923 | if (!rbd_dev->header_name) | |
2924 | return -ENOMEM; | |
2925 | sprintf(rbd_dev->header_name, "%s%s", | |
2926 | RBD_HEADER_PREFIX, rbd_dev->image_id); | |
9d475de5 AE |
2927 | |
2928 | /* Get the size and object order for the image */ | |
2929 | ||
2930 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
2931 | if (ret < 0) |
2932 | goto out_err; | |
2933 | ||
2934 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
2935 | ||
2936 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
2937 | if (ret < 0) |
2938 | goto out_err; | |
2939 | ||
2940 | /* Get the features for the image */ | |
2941 | ||
2942 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
2943 | if (ret < 0) |
2944 | goto out_err; | |
35d489f9 | 2945 | |
6e14b1a6 AE |
2946 | /* crypto and compression type aren't (yet) supported for v2 images */ |
2947 | ||
2948 | rbd_dev->header.crypt_type = 0; | |
2949 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 2950 | |
6e14b1a6 AE |
2951 | /* Get the snapshot context, plus the header version */ |
2952 | ||
2953 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
2954 | if (ret) |
2955 | goto out_err; | |
6e14b1a6 AE |
2956 | rbd_dev->header.obj_version = ver; |
2957 | ||
a30b71b9 AE |
2958 | rbd_dev->image_format = 2; |
2959 | ||
2960 | dout("discovered version 2 image, header name is %s\n", | |
2961 | rbd_dev->header_name); | |
2962 | ||
2963 | return -ENOTSUPP; | |
9d475de5 AE |
2964 | out_err: |
2965 | kfree(rbd_dev->header_name); | |
2966 | rbd_dev->header_name = NULL; | |
1e130199 AE |
2967 | kfree(rbd_dev->header.object_prefix); |
2968 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
2969 | |
2970 | return ret; | |
a30b71b9 AE |
2971 | } |
2972 | ||
2973 | /* | |
2974 | * Probe for the existence of the header object for the given rbd | |
2975 | * device. For format 2 images this includes determining the image | |
2976 | * id. | |
2977 | */ | |
2978 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
2979 | { | |
2980 | int ret; | |
2981 | ||
2982 | /* | |
2983 | * Get the id from the image id object. If it's not a | |
2984 | * format 2 image, we'll get ENOENT back, and we'll assume | |
2985 | * it's a format 1 image. | |
2986 | */ | |
2987 | ret = rbd_dev_image_id(rbd_dev); | |
2988 | if (ret) | |
2989 | ret = rbd_dev_v1_probe(rbd_dev); | |
2990 | else | |
2991 | ret = rbd_dev_v2_probe(rbd_dev); | |
2992 | if (ret) | |
2993 | dout("probe failed, returning %d\n", ret); | |
2994 | ||
2995 | return ret; | |
2996 | } | |
2997 | ||
59c2be1e YS |
2998 | static ssize_t rbd_add(struct bus_type *bus, |
2999 | const char *buf, | |
3000 | size_t count) | |
602adf40 | 3001 | { |
cb8627c7 AE |
3002 | char *options; |
3003 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
3004 | const char *mon_addrs = NULL; |
3005 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
3006 | struct ceph_osd_client *osdc; |
3007 | int rc = -ENOMEM; | |
3feeb894 | 3008 | char *snap_name; |
602adf40 YS |
3009 | |
3010 | if (!try_module_get(THIS_MODULE)) | |
3011 | return -ENODEV; | |
3012 | ||
60571c7d | 3013 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 3014 | if (!options) |
85ae8926 | 3015 | goto err_out_mem; |
cb8627c7 AE |
3016 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
3017 | if (!rbd_dev) | |
85ae8926 | 3018 | goto err_out_mem; |
602adf40 YS |
3019 | |
3020 | /* static rbd_device initialization */ | |
3021 | spin_lock_init(&rbd_dev->lock); | |
3022 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 3023 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 3024 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 3025 | |
602adf40 | 3026 | /* parse add command */ |
3feeb894 AE |
3027 | snap_name = rbd_add_parse_args(rbd_dev, buf, |
3028 | &mon_addrs, &mon_addrs_size, options, count); | |
3029 | if (IS_ERR(snap_name)) { | |
3030 | rc = PTR_ERR(snap_name); | |
85ae8926 | 3031 | goto err_out_mem; |
3feeb894 | 3032 | } |
e124a82f | 3033 | |
f8c38929 AE |
3034 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
3035 | if (rc < 0) | |
85ae8926 | 3036 | goto err_out_args; |
602adf40 | 3037 | |
602adf40 | 3038 | /* pick the pool */ |
1dbb4399 | 3039 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
3040 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
3041 | if (rc < 0) | |
3042 | goto err_out_client; | |
9bb2f334 | 3043 | rbd_dev->pool_id = rc; |
602adf40 | 3044 | |
a30b71b9 AE |
3045 | rc = rbd_dev_probe(rbd_dev); |
3046 | if (rc < 0) | |
05fd6f6f | 3047 | goto err_out_client; |
a30b71b9 | 3048 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
05fd6f6f AE |
3049 | |
3050 | /* no need to lock here, as rbd_dev is not registered yet */ | |
3051 | rc = rbd_dev_snaps_update(rbd_dev); | |
3052 | if (rc) | |
3053 | goto err_out_header; | |
3054 | ||
3055 | rc = rbd_dev_set_mapping(rbd_dev, snap_name); | |
3056 | if (rc) | |
3057 | goto err_out_header; | |
3058 | ||
85ae8926 AE |
3059 | /* generate unique id: find highest unique id, add one */ |
3060 | rbd_dev_id_get(rbd_dev); | |
3061 | ||
3062 | /* Fill in the device name, now that we have its id. */ | |
3063 | BUILD_BUG_ON(DEV_NAME_LEN | |
3064 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
3065 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
3066 | ||
3067 | /* Get our block major device number. */ | |
3068 | ||
27cc2594 AE |
3069 | rc = register_blkdev(0, rbd_dev->name); |
3070 | if (rc < 0) | |
85ae8926 | 3071 | goto err_out_id; |
27cc2594 | 3072 | rbd_dev->major = rc; |
602adf40 | 3073 | |
0f308a31 AE |
3074 | /* Set up the blkdev mapping. */ |
3075 | ||
3076 | rc = rbd_init_disk(rbd_dev); | |
dfc5606d | 3077 | if (rc) |
766fc439 YS |
3078 | goto err_out_blkdev; |
3079 | ||
0f308a31 AE |
3080 | rc = rbd_bus_add_dev(rbd_dev); |
3081 | if (rc) | |
3082 | goto err_out_disk; | |
3083 | ||
32eec68d AE |
3084 | /* |
3085 | * At this point cleanup in the event of an error is the job | |
3086 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
32eec68d | 3087 | */ |
2ac4e75d | 3088 | |
4bb1f1ed | 3089 | down_write(&rbd_dev->header_rwsem); |
5ed16177 | 3090 | rc = rbd_dev_snaps_register(rbd_dev); |
4bb1f1ed | 3091 | up_write(&rbd_dev->header_rwsem); |
2ac4e75d AE |
3092 | if (rc) |
3093 | goto err_out_bus; | |
3094 | ||
3ee4001e AE |
3095 | rc = rbd_init_watch_dev(rbd_dev); |
3096 | if (rc) | |
3097 | goto err_out_bus; | |
3098 | ||
2ac4e75d AE |
3099 | /* Everything's ready. Announce the disk to the world. */ |
3100 | ||
2ac4e75d | 3101 | add_disk(rbd_dev->disk); |
3ee4001e | 3102 | |
2ac4e75d AE |
3103 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
3104 | (unsigned long long) rbd_dev->mapping.size); | |
3105 | ||
602adf40 YS |
3106 | return count; |
3107 | ||
766fc439 | 3108 | err_out_bus: |
766fc439 YS |
3109 | /* this will also clean up rest of rbd_dev stuff */ |
3110 | ||
3111 | rbd_bus_del_dev(rbd_dev); | |
3112 | kfree(options); | |
766fc439 YS |
3113 | return rc; |
3114 | ||
0f308a31 AE |
3115 | err_out_disk: |
3116 | rbd_free_disk(rbd_dev); | |
602adf40 YS |
3117 | err_out_blkdev: |
3118 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
85ae8926 AE |
3119 | err_out_id: |
3120 | rbd_dev_id_put(rbd_dev); | |
05fd6f6f AE |
3121 | err_out_header: |
3122 | rbd_header_free(&rbd_dev->header); | |
602adf40 | 3123 | err_out_client: |
3fcf2581 | 3124 | kfree(rbd_dev->header_name); |
602adf40 | 3125 | rbd_put_client(rbd_dev); |
589d30e0 | 3126 | kfree(rbd_dev->image_id); |
85ae8926 AE |
3127 | err_out_args: |
3128 | kfree(rbd_dev->mapping.snap_name); | |
3129 | kfree(rbd_dev->image_name); | |
3130 | kfree(rbd_dev->pool_name); | |
3131 | err_out_mem: | |
27cc2594 | 3132 | kfree(rbd_dev); |
cb8627c7 | 3133 | kfree(options); |
27cc2594 | 3134 | |
602adf40 YS |
3135 | dout("Error adding device %s\n", buf); |
3136 | module_put(THIS_MODULE); | |
27cc2594 AE |
3137 | |
3138 | return (ssize_t) rc; | |
602adf40 YS |
3139 | } |
3140 | ||
de71a297 | 3141 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
3142 | { |
3143 | struct list_head *tmp; | |
3144 | struct rbd_device *rbd_dev; | |
3145 | ||
e124a82f | 3146 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
3147 | list_for_each(tmp, &rbd_dev_list) { |
3148 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 3149 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 3150 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 3151 | return rbd_dev; |
e124a82f | 3152 | } |
602adf40 | 3153 | } |
e124a82f | 3154 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
3155 | return NULL; |
3156 | } | |
3157 | ||
dfc5606d | 3158 | static void rbd_dev_release(struct device *dev) |
602adf40 | 3159 | { |
593a9e7b | 3160 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3161 | |
1dbb4399 AE |
3162 | if (rbd_dev->watch_request) { |
3163 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3164 | ||
3165 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 3166 | rbd_dev->watch_request); |
1dbb4399 | 3167 | } |
59c2be1e | 3168 | if (rbd_dev->watch_event) |
070c633f | 3169 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 3170 | |
602adf40 YS |
3171 | rbd_put_client(rbd_dev); |
3172 | ||
3173 | /* clean up and free blkdev */ | |
3174 | rbd_free_disk(rbd_dev); | |
3175 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 3176 | |
2ac4e75d AE |
3177 | /* release allocated disk header fields */ |
3178 | rbd_header_free(&rbd_dev->header); | |
3179 | ||
32eec68d | 3180 | /* done with the id, and with the rbd_dev */ |
f84344f3 | 3181 | kfree(rbd_dev->mapping.snap_name); |
589d30e0 | 3182 | kfree(rbd_dev->image_id); |
0bed54dc | 3183 | kfree(rbd_dev->header_name); |
d22f76e7 | 3184 | kfree(rbd_dev->pool_name); |
0bed54dc | 3185 | kfree(rbd_dev->image_name); |
e2839308 | 3186 | rbd_dev_id_put(rbd_dev); |
602adf40 YS |
3187 | kfree(rbd_dev); |
3188 | ||
3189 | /* release module ref */ | |
3190 | module_put(THIS_MODULE); | |
602adf40 YS |
3191 | } |
3192 | ||
dfc5606d YS |
3193 | static ssize_t rbd_remove(struct bus_type *bus, |
3194 | const char *buf, | |
3195 | size_t count) | |
602adf40 YS |
3196 | { |
3197 | struct rbd_device *rbd_dev = NULL; | |
3198 | int target_id, rc; | |
3199 | unsigned long ul; | |
3200 | int ret = count; | |
3201 | ||
3202 | rc = strict_strtoul(buf, 10, &ul); | |
3203 | if (rc) | |
3204 | return rc; | |
3205 | ||
3206 | /* convert to int; abort if we lost anything in the conversion */ | |
3207 | target_id = (int) ul; | |
3208 | if (target_id != ul) | |
3209 | return -EINVAL; | |
3210 | ||
3211 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3212 | ||
3213 | rbd_dev = __rbd_get_dev(target_id); | |
3214 | if (!rbd_dev) { | |
3215 | ret = -ENOENT; | |
3216 | goto done; | |
3217 | } | |
3218 | ||
dfc5606d YS |
3219 | __rbd_remove_all_snaps(rbd_dev); |
3220 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
3221 | |
3222 | done: | |
3223 | mutex_unlock(&ctl_mutex); | |
aafb230e | 3224 | |
602adf40 YS |
3225 | return ret; |
3226 | } | |
3227 | ||
602adf40 YS |
3228 | /* |
3229 | * create control files in sysfs | |
dfc5606d | 3230 | * /sys/bus/rbd/... |
602adf40 YS |
3231 | */ |
3232 | static int rbd_sysfs_init(void) | |
3233 | { | |
dfc5606d | 3234 | int ret; |
602adf40 | 3235 | |
fed4c143 | 3236 | ret = device_register(&rbd_root_dev); |
21079786 | 3237 | if (ret < 0) |
dfc5606d | 3238 | return ret; |
602adf40 | 3239 | |
fed4c143 AE |
3240 | ret = bus_register(&rbd_bus_type); |
3241 | if (ret < 0) | |
3242 | device_unregister(&rbd_root_dev); | |
602adf40 | 3243 | |
602adf40 YS |
3244 | return ret; |
3245 | } | |
3246 | ||
3247 | static void rbd_sysfs_cleanup(void) | |
3248 | { | |
dfc5606d | 3249 | bus_unregister(&rbd_bus_type); |
fed4c143 | 3250 | device_unregister(&rbd_root_dev); |
602adf40 YS |
3251 | } |
3252 | ||
3253 | int __init rbd_init(void) | |
3254 | { | |
3255 | int rc; | |
3256 | ||
3257 | rc = rbd_sysfs_init(); | |
3258 | if (rc) | |
3259 | return rc; | |
f0f8cef5 | 3260 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
3261 | return 0; |
3262 | } | |
3263 | ||
3264 | void __exit rbd_exit(void) | |
3265 | { | |
3266 | rbd_sysfs_cleanup(); | |
3267 | } | |
3268 | ||
3269 | module_init(rbd_init); | |
3270 | module_exit(rbd_exit); | |
3271 | ||
3272 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
3273 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
3274 | MODULE_DESCRIPTION("rados block device"); | |
3275 | ||
3276 | /* following authorship retained from original osdblk.c */ | |
3277 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
3278 | ||
3279 | MODULE_LICENSE("GPL"); |