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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 YS |
64 | #define RBD_MAX_SNAP_NAME_LEN 32 |
65 | #define RBD_MAX_OPT_LEN 1024 | |
66 | ||
67 | #define RBD_SNAP_HEAD_NAME "-" | |
68 | ||
1e130199 AE |
69 | #define RBD_IMAGE_ID_LEN_MAX 64 |
70 | #define RBD_OBJ_PREFIX_LEN_MAX 64 | |
589d30e0 | 71 | |
81a89793 AE |
72 | /* |
73 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
74 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
75 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
76 | * enough to hold all possible device names. | |
77 | */ | |
602adf40 | 78 | #define DEV_NAME_LEN 32 |
81a89793 | 79 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 80 | |
cc0538b6 | 81 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 82 | |
602adf40 YS |
83 | /* |
84 | * block device image metadata (in-memory version) | |
85 | */ | |
86 | struct rbd_image_header { | |
f84344f3 | 87 | /* These four fields never change for a given rbd image */ |
849b4260 | 88 | char *object_prefix; |
34b13184 | 89 | u64 features; |
602adf40 YS |
90 | __u8 obj_order; |
91 | __u8 crypt_type; | |
92 | __u8 comp_type; | |
602adf40 | 93 | |
f84344f3 AE |
94 | /* The remaining fields need to be updated occasionally */ |
95 | u64 image_size; | |
96 | struct ceph_snap_context *snapc; | |
602adf40 YS |
97 | char *snap_names; |
98 | u64 *snap_sizes; | |
59c2be1e YS |
99 | |
100 | u64 obj_version; | |
101 | }; | |
102 | ||
103 | struct rbd_options { | |
cc0538b6 | 104 | bool read_only; |
602adf40 YS |
105 | }; |
106 | ||
107 | /* | |
f0f8cef5 | 108 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
109 | */ |
110 | struct rbd_client { | |
111 | struct ceph_client *client; | |
112 | struct kref kref; | |
113 | struct list_head node; | |
114 | }; | |
115 | ||
116 | /* | |
f0f8cef5 | 117 | * a request completion status |
602adf40 | 118 | */ |
1fec7093 YS |
119 | struct rbd_req_status { |
120 | int done; | |
121 | int rc; | |
122 | u64 bytes; | |
123 | }; | |
124 | ||
125 | /* | |
126 | * a collection of requests | |
127 | */ | |
128 | struct rbd_req_coll { | |
129 | int total; | |
130 | int num_done; | |
131 | struct kref kref; | |
132 | struct rbd_req_status status[0]; | |
602adf40 YS |
133 | }; |
134 | ||
f0f8cef5 AE |
135 | /* |
136 | * a single io request | |
137 | */ | |
138 | struct rbd_request { | |
139 | struct request *rq; /* blk layer request */ | |
140 | struct bio *bio; /* cloned bio */ | |
141 | struct page **pages; /* list of used pages */ | |
142 | u64 len; | |
143 | int coll_index; | |
144 | struct rbd_req_coll *coll; | |
145 | }; | |
146 | ||
dfc5606d YS |
147 | struct rbd_snap { |
148 | struct device dev; | |
149 | const char *name; | |
3591538f | 150 | u64 size; |
dfc5606d YS |
151 | struct list_head node; |
152 | u64 id; | |
34b13184 | 153 | u64 features; |
dfc5606d YS |
154 | }; |
155 | ||
f84344f3 AE |
156 | struct rbd_mapping { |
157 | char *snap_name; | |
158 | u64 snap_id; | |
99c1f08f | 159 | u64 size; |
34b13184 | 160 | u64 features; |
f84344f3 AE |
161 | bool snap_exists; |
162 | bool read_only; | |
163 | }; | |
164 | ||
602adf40 YS |
165 | /* |
166 | * a single device | |
167 | */ | |
168 | struct rbd_device { | |
de71a297 | 169 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
170 | |
171 | int major; /* blkdev assigned major */ | |
172 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 173 | |
a30b71b9 | 174 | u32 image_format; /* Either 1 or 2 */ |
f8c38929 | 175 | struct rbd_options rbd_opts; |
602adf40 YS |
176 | struct rbd_client *rbd_client; |
177 | ||
178 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
179 | ||
180 | spinlock_t lock; /* queue lock */ | |
181 | ||
182 | struct rbd_image_header header; | |
589d30e0 AE |
183 | char *image_id; |
184 | size_t image_id_len; | |
0bed54dc AE |
185 | char *image_name; |
186 | size_t image_name_len; | |
187 | char *header_name; | |
d22f76e7 | 188 | char *pool_name; |
9bb2f334 | 189 | int pool_id; |
602adf40 | 190 | |
59c2be1e YS |
191 | struct ceph_osd_event *watch_event; |
192 | struct ceph_osd_request *watch_request; | |
193 | ||
c666601a JD |
194 | /* protects updating the header */ |
195 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
196 | |
197 | struct rbd_mapping mapping; | |
602adf40 YS |
198 | |
199 | struct list_head node; | |
dfc5606d YS |
200 | |
201 | /* list of snapshots */ | |
202 | struct list_head snaps; | |
203 | ||
204 | /* sysfs related */ | |
205 | struct device dev; | |
206 | }; | |
207 | ||
602adf40 | 208 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 209 | |
602adf40 | 210 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
211 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
212 | ||
432b8587 AE |
213 | static LIST_HEAD(rbd_client_list); /* clients */ |
214 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 215 | |
304f6808 AE |
216 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
217 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); | |
218 | ||
dfc5606d | 219 | static void rbd_dev_release(struct device *dev); |
14e7085d | 220 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 221 | |
f0f8cef5 AE |
222 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
223 | size_t count); | |
224 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
225 | size_t count); | |
226 | ||
227 | static struct bus_attribute rbd_bus_attrs[] = { | |
228 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
229 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
230 | __ATTR_NULL | |
231 | }; | |
232 | ||
233 | static struct bus_type rbd_bus_type = { | |
234 | .name = "rbd", | |
235 | .bus_attrs = rbd_bus_attrs, | |
236 | }; | |
237 | ||
238 | static void rbd_root_dev_release(struct device *dev) | |
239 | { | |
240 | } | |
241 | ||
242 | static struct device rbd_root_dev = { | |
243 | .init_name = "rbd", | |
244 | .release = rbd_root_dev_release, | |
245 | }; | |
246 | ||
aafb230e AE |
247 | #ifdef RBD_DEBUG |
248 | #define rbd_assert(expr) \ | |
249 | if (unlikely(!(expr))) { \ | |
250 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
251 | "at line %d:\n\n" \ | |
252 | "\trbd_assert(%s);\n\n", \ | |
253 | __func__, __LINE__, #expr); \ | |
254 | BUG(); \ | |
255 | } | |
256 | #else /* !RBD_DEBUG */ | |
257 | # define rbd_assert(expr) ((void) 0) | |
258 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 259 | |
dfc5606d YS |
260 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
261 | { | |
262 | return get_device(&rbd_dev->dev); | |
263 | } | |
264 | ||
265 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
266 | { | |
267 | put_device(&rbd_dev->dev); | |
268 | } | |
602adf40 | 269 | |
1fe5e993 | 270 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 271 | |
602adf40 YS |
272 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
273 | { | |
f0f8cef5 | 274 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 275 | |
f84344f3 | 276 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
277 | return -EROFS; |
278 | ||
340c7a2b | 279 | rbd_get_dev(rbd_dev); |
f84344f3 | 280 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
340c7a2b | 281 | |
602adf40 YS |
282 | return 0; |
283 | } | |
284 | ||
dfc5606d YS |
285 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
286 | { | |
287 | struct rbd_device *rbd_dev = disk->private_data; | |
288 | ||
289 | rbd_put_dev(rbd_dev); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
602adf40 YS |
294 | static const struct block_device_operations rbd_bd_ops = { |
295 | .owner = THIS_MODULE, | |
296 | .open = rbd_open, | |
dfc5606d | 297 | .release = rbd_release, |
602adf40 YS |
298 | }; |
299 | ||
300 | /* | |
301 | * Initialize an rbd client instance. | |
43ae4701 | 302 | * We own *ceph_opts. |
602adf40 | 303 | */ |
f8c38929 | 304 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
305 | { |
306 | struct rbd_client *rbdc; | |
307 | int ret = -ENOMEM; | |
308 | ||
309 | dout("rbd_client_create\n"); | |
310 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
311 | if (!rbdc) | |
312 | goto out_opt; | |
313 | ||
314 | kref_init(&rbdc->kref); | |
315 | INIT_LIST_HEAD(&rbdc->node); | |
316 | ||
bc534d86 AE |
317 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
318 | ||
43ae4701 | 319 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 320 | if (IS_ERR(rbdc->client)) |
bc534d86 | 321 | goto out_mutex; |
43ae4701 | 322 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
323 | |
324 | ret = ceph_open_session(rbdc->client); | |
325 | if (ret < 0) | |
326 | goto out_err; | |
327 | ||
432b8587 | 328 | spin_lock(&rbd_client_list_lock); |
602adf40 | 329 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 330 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 331 | |
bc534d86 AE |
332 | mutex_unlock(&ctl_mutex); |
333 | ||
602adf40 YS |
334 | dout("rbd_client_create created %p\n", rbdc); |
335 | return rbdc; | |
336 | ||
337 | out_err: | |
338 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
339 | out_mutex: |
340 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
341 | kfree(rbdc); |
342 | out_opt: | |
43ae4701 AE |
343 | if (ceph_opts) |
344 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 345 | return ERR_PTR(ret); |
602adf40 YS |
346 | } |
347 | ||
348 | /* | |
1f7ba331 AE |
349 | * Find a ceph client with specific addr and configuration. If |
350 | * found, bump its reference count. | |
602adf40 | 351 | */ |
1f7ba331 | 352 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
353 | { |
354 | struct rbd_client *client_node; | |
1f7ba331 | 355 | bool found = false; |
602adf40 | 356 | |
43ae4701 | 357 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
358 | return NULL; |
359 | ||
1f7ba331 AE |
360 | spin_lock(&rbd_client_list_lock); |
361 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
362 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
363 | kref_get(&client_node->kref); | |
364 | found = true; | |
365 | break; | |
366 | } | |
367 | } | |
368 | spin_unlock(&rbd_client_list_lock); | |
369 | ||
370 | return found ? client_node : NULL; | |
602adf40 YS |
371 | } |
372 | ||
59c2be1e YS |
373 | /* |
374 | * mount options | |
375 | */ | |
376 | enum { | |
59c2be1e YS |
377 | Opt_last_int, |
378 | /* int args above */ | |
379 | Opt_last_string, | |
380 | /* string args above */ | |
cc0538b6 AE |
381 | Opt_read_only, |
382 | Opt_read_write, | |
383 | /* Boolean args above */ | |
384 | Opt_last_bool, | |
59c2be1e YS |
385 | }; |
386 | ||
43ae4701 | 387 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
388 | /* int args above */ |
389 | /* string args above */ | |
f84344f3 | 390 | {Opt_read_only, "mapping.read_only"}, |
cc0538b6 AE |
391 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
392 | {Opt_read_write, "read_write"}, | |
393 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
394 | /* Boolean args above */ | |
59c2be1e YS |
395 | {-1, NULL} |
396 | }; | |
397 | ||
398 | static int parse_rbd_opts_token(char *c, void *private) | |
399 | { | |
43ae4701 | 400 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
401 | substring_t argstr[MAX_OPT_ARGS]; |
402 | int token, intval, ret; | |
403 | ||
43ae4701 | 404 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
405 | if (token < 0) |
406 | return -EINVAL; | |
407 | ||
408 | if (token < Opt_last_int) { | |
409 | ret = match_int(&argstr[0], &intval); | |
410 | if (ret < 0) { | |
411 | pr_err("bad mount option arg (not int) " | |
412 | "at '%s'\n", c); | |
413 | return ret; | |
414 | } | |
415 | dout("got int token %d val %d\n", token, intval); | |
416 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
417 | dout("got string token %d val %s\n", token, | |
418 | argstr[0].from); | |
cc0538b6 AE |
419 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
420 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
421 | } else { |
422 | dout("got token %d\n", token); | |
423 | } | |
424 | ||
425 | switch (token) { | |
cc0538b6 AE |
426 | case Opt_read_only: |
427 | rbd_opts->read_only = true; | |
428 | break; | |
429 | case Opt_read_write: | |
430 | rbd_opts->read_only = false; | |
431 | break; | |
59c2be1e | 432 | default: |
aafb230e AE |
433 | rbd_assert(false); |
434 | break; | |
59c2be1e YS |
435 | } |
436 | return 0; | |
437 | } | |
438 | ||
602adf40 YS |
439 | /* |
440 | * Get a ceph client with specific addr and configuration, if one does | |
441 | * not exist create it. | |
442 | */ | |
f8c38929 AE |
443 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
444 | size_t mon_addr_len, char *options) | |
602adf40 | 445 | { |
f8c38929 | 446 | struct rbd_options *rbd_opts = &rbd_dev->rbd_opts; |
43ae4701 | 447 | struct ceph_options *ceph_opts; |
f8c38929 | 448 | struct rbd_client *rbdc; |
59c2be1e | 449 | |
cc0538b6 | 450 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
602adf40 | 451 | |
43ae4701 AE |
452 | ceph_opts = ceph_parse_options(options, mon_addr, |
453 | mon_addr + mon_addr_len, | |
454 | parse_rbd_opts_token, rbd_opts); | |
f8c38929 AE |
455 | if (IS_ERR(ceph_opts)) |
456 | return PTR_ERR(ceph_opts); | |
602adf40 | 457 | |
1f7ba331 | 458 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 459 | if (rbdc) { |
602adf40 | 460 | /* using an existing client */ |
43ae4701 | 461 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
462 | } else { |
463 | rbdc = rbd_client_create(ceph_opts); | |
464 | if (IS_ERR(rbdc)) | |
465 | return PTR_ERR(rbdc); | |
602adf40 | 466 | } |
f8c38929 | 467 | rbd_dev->rbd_client = rbdc; |
602adf40 | 468 | |
f8c38929 | 469 | return 0; |
602adf40 YS |
470 | } |
471 | ||
472 | /* | |
473 | * Destroy ceph client | |
d23a4b3f | 474 | * |
432b8587 | 475 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
476 | */ |
477 | static void rbd_client_release(struct kref *kref) | |
478 | { | |
479 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
480 | ||
481 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 482 | spin_lock(&rbd_client_list_lock); |
602adf40 | 483 | list_del(&rbdc->node); |
cd9d9f5d | 484 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
485 | |
486 | ceph_destroy_client(rbdc->client); | |
487 | kfree(rbdc); | |
488 | } | |
489 | ||
490 | /* | |
491 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
492 | * it. | |
493 | */ | |
494 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
495 | { | |
496 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
497 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
498 | } |
499 | ||
1fec7093 YS |
500 | /* |
501 | * Destroy requests collection | |
502 | */ | |
503 | static void rbd_coll_release(struct kref *kref) | |
504 | { | |
505 | struct rbd_req_coll *coll = | |
506 | container_of(kref, struct rbd_req_coll, kref); | |
507 | ||
508 | dout("rbd_coll_release %p\n", coll); | |
509 | kfree(coll); | |
510 | } | |
602adf40 | 511 | |
a30b71b9 AE |
512 | static bool rbd_image_format_valid(u32 image_format) |
513 | { | |
514 | return image_format == 1 || image_format == 2; | |
515 | } | |
516 | ||
8e94af8e AE |
517 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
518 | { | |
103a150f AE |
519 | size_t size; |
520 | u32 snap_count; | |
521 | ||
522 | /* The header has to start with the magic rbd header text */ | |
523 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
524 | return false; | |
525 | ||
526 | /* | |
527 | * The size of a snapshot header has to fit in a size_t, and | |
528 | * that limits the number of snapshots. | |
529 | */ | |
530 | snap_count = le32_to_cpu(ondisk->snap_count); | |
531 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
532 | if (snap_count > size / sizeof (__le64)) | |
533 | return false; | |
534 | ||
535 | /* | |
536 | * Not only that, but the size of the entire the snapshot | |
537 | * header must also be representable in a size_t. | |
538 | */ | |
539 | size -= snap_count * sizeof (__le64); | |
540 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
541 | return false; | |
542 | ||
543 | return true; | |
8e94af8e AE |
544 | } |
545 | ||
602adf40 YS |
546 | /* |
547 | * Create a new header structure, translate header format from the on-disk | |
548 | * header. | |
549 | */ | |
550 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 551 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 552 | { |
ccece235 | 553 | u32 snap_count; |
58c17b0e | 554 | size_t len; |
d2bb24e5 | 555 | size_t size; |
621901d6 | 556 | u32 i; |
602adf40 | 557 | |
6a52325f AE |
558 | memset(header, 0, sizeof (*header)); |
559 | ||
103a150f AE |
560 | snap_count = le32_to_cpu(ondisk->snap_count); |
561 | ||
58c17b0e AE |
562 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
563 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 564 | if (!header->object_prefix) |
602adf40 | 565 | return -ENOMEM; |
58c17b0e AE |
566 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
567 | header->object_prefix[len] = '\0'; | |
00f1f36f | 568 | |
602adf40 | 569 | if (snap_count) { |
f785cc1d AE |
570 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
571 | ||
621901d6 AE |
572 | /* Save a copy of the snapshot names */ |
573 | ||
f785cc1d AE |
574 | if (snap_names_len > (u64) SIZE_MAX) |
575 | return -EIO; | |
576 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 577 | if (!header->snap_names) |
6a52325f | 578 | goto out_err; |
f785cc1d AE |
579 | /* |
580 | * Note that rbd_dev_v1_header_read() guarantees | |
581 | * the ondisk buffer we're working with has | |
582 | * snap_names_len bytes beyond the end of the | |
583 | * snapshot id array, this memcpy() is safe. | |
584 | */ | |
585 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
586 | snap_names_len); | |
6a52325f | 587 | |
621901d6 AE |
588 | /* Record each snapshot's size */ |
589 | ||
d2bb24e5 AE |
590 | size = snap_count * sizeof (*header->snap_sizes); |
591 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 592 | if (!header->snap_sizes) |
6a52325f | 593 | goto out_err; |
621901d6 AE |
594 | for (i = 0; i < snap_count; i++) |
595 | header->snap_sizes[i] = | |
596 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 597 | } else { |
ccece235 | 598 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
599 | header->snap_names = NULL; |
600 | header->snap_sizes = NULL; | |
601 | } | |
849b4260 | 602 | |
34b13184 | 603 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
604 | header->obj_order = ondisk->options.order; |
605 | header->crypt_type = ondisk->options.crypt_type; | |
606 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 607 | |
621901d6 AE |
608 | /* Allocate and fill in the snapshot context */ |
609 | ||
f84344f3 | 610 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
611 | size = sizeof (struct ceph_snap_context); |
612 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
613 | header->snapc = kzalloc(size, GFP_KERNEL); | |
614 | if (!header->snapc) | |
615 | goto out_err; | |
602adf40 YS |
616 | |
617 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 618 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 619 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
620 | for (i = 0; i < snap_count; i++) |
621 | header->snapc->snaps[i] = | |
622 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
623 | |
624 | return 0; | |
625 | ||
6a52325f | 626 | out_err: |
849b4260 | 627 | kfree(header->snap_sizes); |
ccece235 | 628 | header->snap_sizes = NULL; |
602adf40 | 629 | kfree(header->snap_names); |
ccece235 | 630 | header->snap_names = NULL; |
6a52325f AE |
631 | kfree(header->object_prefix); |
632 | header->object_prefix = NULL; | |
ccece235 | 633 | |
00f1f36f | 634 | return -ENOMEM; |
602adf40 YS |
635 | } |
636 | ||
8836b995 | 637 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 638 | { |
602adf40 | 639 | |
e86924a8 | 640 | struct rbd_snap *snap; |
602adf40 | 641 | |
e86924a8 AE |
642 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
643 | if (!strcmp(snap_name, snap->name)) { | |
644 | rbd_dev->mapping.snap_id = snap->id; | |
645 | rbd_dev->mapping.size = snap->size; | |
34b13184 | 646 | rbd_dev->mapping.features = snap->features; |
602adf40 | 647 | |
e86924a8 | 648 | return 0; |
00f1f36f | 649 | } |
00f1f36f | 650 | } |
e86924a8 | 651 | |
00f1f36f | 652 | return -ENOENT; |
602adf40 YS |
653 | } |
654 | ||
5ed16177 | 655 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev, char *snap_name) |
602adf40 | 656 | { |
78dc447d | 657 | int ret; |
602adf40 | 658 | |
4e1105a2 | 659 | if (!memcmp(snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 660 | sizeof (RBD_SNAP_HEAD_NAME))) { |
f84344f3 | 661 | rbd_dev->mapping.snap_id = CEPH_NOSNAP; |
99c1f08f | 662 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 663 | rbd_dev->mapping.features = rbd_dev->header.features; |
f84344f3 AE |
664 | rbd_dev->mapping.snap_exists = false; |
665 | rbd_dev->mapping.read_only = rbd_dev->rbd_opts.read_only; | |
e86924a8 | 666 | ret = 0; |
602adf40 | 667 | } else { |
8836b995 | 668 | ret = snap_by_name(rbd_dev, snap_name); |
602adf40 YS |
669 | if (ret < 0) |
670 | goto done; | |
f84344f3 AE |
671 | rbd_dev->mapping.snap_exists = true; |
672 | rbd_dev->mapping.read_only = true; | |
602adf40 | 673 | } |
4e1105a2 | 674 | rbd_dev->mapping.snap_name = snap_name; |
602adf40 | 675 | done: |
602adf40 YS |
676 | return ret; |
677 | } | |
678 | ||
679 | static void rbd_header_free(struct rbd_image_header *header) | |
680 | { | |
849b4260 | 681 | kfree(header->object_prefix); |
d78fd7ae | 682 | header->object_prefix = NULL; |
602adf40 | 683 | kfree(header->snap_sizes); |
d78fd7ae | 684 | header->snap_sizes = NULL; |
849b4260 | 685 | kfree(header->snap_names); |
d78fd7ae | 686 | header->snap_names = NULL; |
d1d25646 | 687 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 688 | header->snapc = NULL; |
602adf40 YS |
689 | } |
690 | ||
65ccfe21 | 691 | static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 692 | { |
65ccfe21 AE |
693 | char *name; |
694 | u64 segment; | |
695 | int ret; | |
602adf40 | 696 | |
65ccfe21 AE |
697 | name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
698 | if (!name) | |
699 | return NULL; | |
700 | segment = offset >> rbd_dev->header.obj_order; | |
701 | ret = snprintf(name, RBD_MAX_SEG_NAME_LEN, "%s.%012llx", | |
702 | rbd_dev->header.object_prefix, segment); | |
703 | if (ret < 0 || ret >= RBD_MAX_SEG_NAME_LEN) { | |
704 | pr_err("error formatting segment name for #%llu (%d)\n", | |
705 | segment, ret); | |
706 | kfree(name); | |
707 | name = NULL; | |
708 | } | |
602adf40 | 709 | |
65ccfe21 AE |
710 | return name; |
711 | } | |
602adf40 | 712 | |
65ccfe21 AE |
713 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
714 | { | |
715 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 716 | |
65ccfe21 AE |
717 | return offset & (segment_size - 1); |
718 | } | |
719 | ||
720 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
721 | u64 offset, u64 length) | |
722 | { | |
723 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
724 | ||
725 | offset &= segment_size - 1; | |
726 | ||
aafb230e | 727 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
728 | if (offset + length > segment_size) |
729 | length = segment_size - offset; | |
730 | ||
731 | return length; | |
602adf40 YS |
732 | } |
733 | ||
1fec7093 YS |
734 | static int rbd_get_num_segments(struct rbd_image_header *header, |
735 | u64 ofs, u64 len) | |
736 | { | |
df111be6 AE |
737 | u64 start_seg; |
738 | u64 end_seg; | |
739 | ||
740 | if (!len) | |
741 | return 0; | |
742 | if (len - 1 > U64_MAX - ofs) | |
743 | return -ERANGE; | |
744 | ||
745 | start_seg = ofs >> header->obj_order; | |
746 | end_seg = (ofs + len - 1) >> header->obj_order; | |
747 | ||
1fec7093 YS |
748 | return end_seg - start_seg + 1; |
749 | } | |
750 | ||
029bcbd8 JD |
751 | /* |
752 | * returns the size of an object in the image | |
753 | */ | |
754 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
755 | { | |
756 | return 1 << header->obj_order; | |
757 | } | |
758 | ||
602adf40 YS |
759 | /* |
760 | * bio helpers | |
761 | */ | |
762 | ||
763 | static void bio_chain_put(struct bio *chain) | |
764 | { | |
765 | struct bio *tmp; | |
766 | ||
767 | while (chain) { | |
768 | tmp = chain; | |
769 | chain = chain->bi_next; | |
770 | bio_put(tmp); | |
771 | } | |
772 | } | |
773 | ||
774 | /* | |
775 | * zeros a bio chain, starting at specific offset | |
776 | */ | |
777 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
778 | { | |
779 | struct bio_vec *bv; | |
780 | unsigned long flags; | |
781 | void *buf; | |
782 | int i; | |
783 | int pos = 0; | |
784 | ||
785 | while (chain) { | |
786 | bio_for_each_segment(bv, chain, i) { | |
787 | if (pos + bv->bv_len > start_ofs) { | |
788 | int remainder = max(start_ofs - pos, 0); | |
789 | buf = bvec_kmap_irq(bv, &flags); | |
790 | memset(buf + remainder, 0, | |
791 | bv->bv_len - remainder); | |
85b5aaa6 | 792 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
793 | } |
794 | pos += bv->bv_len; | |
795 | } | |
796 | ||
797 | chain = chain->bi_next; | |
798 | } | |
799 | } | |
800 | ||
801 | /* | |
802 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
803 | * might return a bio_pair that will need to be released. | |
804 | */ | |
805 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
806 | struct bio_pair **bp, | |
807 | int len, gfp_t gfpmask) | |
808 | { | |
542582fc AE |
809 | struct bio *old_chain = *old; |
810 | struct bio *new_chain = NULL; | |
811 | struct bio *tail; | |
602adf40 YS |
812 | int total = 0; |
813 | ||
814 | if (*bp) { | |
815 | bio_pair_release(*bp); | |
816 | *bp = NULL; | |
817 | } | |
818 | ||
819 | while (old_chain && (total < len)) { | |
542582fc AE |
820 | struct bio *tmp; |
821 | ||
602adf40 YS |
822 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
823 | if (!tmp) | |
824 | goto err_out; | |
542582fc | 825 | gfpmask &= ~__GFP_WAIT; /* can't wait after the first */ |
602adf40 YS |
826 | |
827 | if (total + old_chain->bi_size > len) { | |
828 | struct bio_pair *bp; | |
829 | ||
830 | /* | |
831 | * this split can only happen with a single paged bio, | |
832 | * split_bio will BUG_ON if this is not the case | |
833 | */ | |
834 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
835 | "bi_size=%u\n", |
836 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
837 | |
838 | /* split the bio. We'll release it either in the next | |
839 | call, or it will have to be released outside */ | |
593a9e7b | 840 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
841 | if (!bp) |
842 | goto err_out; | |
843 | ||
844 | __bio_clone(tmp, &bp->bio1); | |
845 | ||
846 | *next = &bp->bio2; | |
847 | } else { | |
848 | __bio_clone(tmp, old_chain); | |
849 | *next = old_chain->bi_next; | |
850 | } | |
851 | ||
852 | tmp->bi_bdev = NULL; | |
602adf40 | 853 | tmp->bi_next = NULL; |
542582fc | 854 | if (new_chain) |
602adf40 | 855 | tail->bi_next = tmp; |
542582fc AE |
856 | else |
857 | new_chain = tmp; | |
858 | tail = tmp; | |
602adf40 YS |
859 | old_chain = old_chain->bi_next; |
860 | ||
861 | total += tmp->bi_size; | |
862 | } | |
863 | ||
aafb230e | 864 | rbd_assert(total == len); |
602adf40 | 865 | |
602adf40 YS |
866 | *old = old_chain; |
867 | ||
868 | return new_chain; | |
869 | ||
870 | err_out: | |
871 | dout("bio_chain_clone with err\n"); | |
872 | bio_chain_put(new_chain); | |
873 | return NULL; | |
874 | } | |
875 | ||
876 | /* | |
877 | * helpers for osd request op vectors. | |
878 | */ | |
57cfc106 AE |
879 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
880 | int opcode, u32 payload_len) | |
602adf40 | 881 | { |
57cfc106 AE |
882 | struct ceph_osd_req_op *ops; |
883 | ||
884 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
885 | if (!ops) | |
886 | return NULL; | |
887 | ||
888 | ops[0].op = opcode; | |
889 | ||
602adf40 YS |
890 | /* |
891 | * op extent offset and length will be set later on | |
892 | * in calc_raw_layout() | |
893 | */ | |
57cfc106 AE |
894 | ops[0].payload_len = payload_len; |
895 | ||
896 | return ops; | |
602adf40 YS |
897 | } |
898 | ||
899 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
900 | { | |
901 | kfree(ops); | |
902 | } | |
903 | ||
1fec7093 YS |
904 | static void rbd_coll_end_req_index(struct request *rq, |
905 | struct rbd_req_coll *coll, | |
906 | int index, | |
907 | int ret, u64 len) | |
908 | { | |
909 | struct request_queue *q; | |
910 | int min, max, i; | |
911 | ||
bd919d45 AE |
912 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
913 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
914 | |
915 | if (!rq) | |
916 | return; | |
917 | ||
918 | if (!coll) { | |
919 | blk_end_request(rq, ret, len); | |
920 | return; | |
921 | } | |
922 | ||
923 | q = rq->q; | |
924 | ||
925 | spin_lock_irq(q->queue_lock); | |
926 | coll->status[index].done = 1; | |
927 | coll->status[index].rc = ret; | |
928 | coll->status[index].bytes = len; | |
929 | max = min = coll->num_done; | |
930 | while (max < coll->total && coll->status[max].done) | |
931 | max++; | |
932 | ||
933 | for (i = min; i<max; i++) { | |
934 | __blk_end_request(rq, coll->status[i].rc, | |
935 | coll->status[i].bytes); | |
936 | coll->num_done++; | |
937 | kref_put(&coll->kref, rbd_coll_release); | |
938 | } | |
939 | spin_unlock_irq(q->queue_lock); | |
940 | } | |
941 | ||
942 | static void rbd_coll_end_req(struct rbd_request *req, | |
943 | int ret, u64 len) | |
944 | { | |
945 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
946 | } | |
947 | ||
602adf40 YS |
948 | /* |
949 | * Send ceph osd request | |
950 | */ | |
951 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 952 | struct rbd_device *rbd_dev, |
602adf40 YS |
953 | struct ceph_snap_context *snapc, |
954 | u64 snapid, | |
aded07ea | 955 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
956 | struct bio *bio, |
957 | struct page **pages, | |
958 | int num_pages, | |
959 | int flags, | |
960 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
961 | struct rbd_req_coll *coll, |
962 | int coll_index, | |
602adf40 | 963 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
964 | struct ceph_msg *msg), |
965 | struct ceph_osd_request **linger_req, | |
966 | u64 *ver) | |
602adf40 YS |
967 | { |
968 | struct ceph_osd_request *req; | |
969 | struct ceph_file_layout *layout; | |
970 | int ret; | |
971 | u64 bno; | |
972 | struct timespec mtime = CURRENT_TIME; | |
973 | struct rbd_request *req_data; | |
974 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 975 | struct ceph_osd_client *osdc; |
602adf40 | 976 | |
602adf40 | 977 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
978 | if (!req_data) { |
979 | if (coll) | |
980 | rbd_coll_end_req_index(rq, coll, coll_index, | |
981 | -ENOMEM, len); | |
982 | return -ENOMEM; | |
983 | } | |
984 | ||
985 | if (coll) { | |
986 | req_data->coll = coll; | |
987 | req_data->coll_index = coll_index; | |
988 | } | |
602adf40 | 989 | |
bd919d45 AE |
990 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
991 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 992 | |
0ce1a794 | 993 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
994 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
995 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 996 | if (!req) { |
4ad12621 | 997 | ret = -ENOMEM; |
602adf40 YS |
998 | goto done_pages; |
999 | } | |
1000 | ||
1001 | req->r_callback = rbd_cb; | |
1002 | ||
1003 | req_data->rq = rq; | |
1004 | req_data->bio = bio; | |
1005 | req_data->pages = pages; | |
1006 | req_data->len = len; | |
1007 | ||
1008 | req->r_priv = req_data; | |
1009 | ||
1010 | reqhead = req->r_request->front.iov_base; | |
1011 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
1012 | ||
aded07ea | 1013 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
1014 | req->r_oid_len = strlen(req->r_oid); |
1015 | ||
1016 | layout = &req->r_file_layout; | |
1017 | memset(layout, 0, sizeof(*layout)); | |
1018 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
1019 | layout->fl_stripe_count = cpu_to_le32(1); | |
1020 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 1021 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
1022 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
1023 | req, ops); | |
602adf40 YS |
1024 | |
1025 | ceph_osdc_build_request(req, ofs, &len, | |
1026 | ops, | |
1027 | snapc, | |
1028 | &mtime, | |
1029 | req->r_oid, req->r_oid_len); | |
602adf40 | 1030 | |
59c2be1e | 1031 | if (linger_req) { |
1dbb4399 | 1032 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
1033 | *linger_req = req; |
1034 | } | |
1035 | ||
1dbb4399 | 1036 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
1037 | if (ret < 0) |
1038 | goto done_err; | |
1039 | ||
1040 | if (!rbd_cb) { | |
1dbb4399 | 1041 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1042 | if (ver) |
1043 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1044 | dout("reassert_ver=%llu\n", |
1045 | (unsigned long long) | |
1046 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1047 | ceph_osdc_put_request(req); |
1048 | } | |
1049 | return ret; | |
1050 | ||
1051 | done_err: | |
1052 | bio_chain_put(req_data->bio); | |
1053 | ceph_osdc_put_request(req); | |
1054 | done_pages: | |
1fec7093 | 1055 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1056 | kfree(req_data); |
602adf40 YS |
1057 | return ret; |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * Ceph osd op callback | |
1062 | */ | |
1063 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1064 | { | |
1065 | struct rbd_request *req_data = req->r_priv; | |
1066 | struct ceph_osd_reply_head *replyhead; | |
1067 | struct ceph_osd_op *op; | |
1068 | __s32 rc; | |
1069 | u64 bytes; | |
1070 | int read_op; | |
1071 | ||
1072 | /* parse reply */ | |
1073 | replyhead = msg->front.iov_base; | |
1074 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1075 | op = (void *)(replyhead + 1); | |
1076 | rc = le32_to_cpu(replyhead->result); | |
1077 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1078 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1079 | |
bd919d45 AE |
1080 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1081 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1082 | |
1083 | if (rc == -ENOENT && read_op) { | |
1084 | zero_bio_chain(req_data->bio, 0); | |
1085 | rc = 0; | |
1086 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1087 | zero_bio_chain(req_data->bio, bytes); | |
1088 | bytes = req_data->len; | |
1089 | } | |
1090 | ||
1fec7093 | 1091 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1092 | |
1093 | if (req_data->bio) | |
1094 | bio_chain_put(req_data->bio); | |
1095 | ||
1096 | ceph_osdc_put_request(req); | |
1097 | kfree(req_data); | |
1098 | } | |
1099 | ||
59c2be1e YS |
1100 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1101 | { | |
1102 | ceph_osdc_put_request(req); | |
1103 | } | |
1104 | ||
602adf40 YS |
1105 | /* |
1106 | * Do a synchronous ceph osd operation | |
1107 | */ | |
0ce1a794 | 1108 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1109 | struct ceph_snap_context *snapc, |
1110 | u64 snapid, | |
602adf40 | 1111 | int flags, |
913d2fdc | 1112 | struct ceph_osd_req_op *ops, |
aded07ea | 1113 | const char *object_name, |
f8d4de6e AE |
1114 | u64 ofs, u64 inbound_size, |
1115 | char *inbound, | |
59c2be1e YS |
1116 | struct ceph_osd_request **linger_req, |
1117 | u64 *ver) | |
602adf40 YS |
1118 | { |
1119 | int ret; | |
1120 | struct page **pages; | |
1121 | int num_pages; | |
913d2fdc | 1122 | |
aafb230e | 1123 | rbd_assert(ops != NULL); |
602adf40 | 1124 | |
f8d4de6e | 1125 | num_pages = calc_pages_for(ofs, inbound_size); |
602adf40 | 1126 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
b8d0638a DC |
1127 | if (IS_ERR(pages)) |
1128 | return PTR_ERR(pages); | |
602adf40 | 1129 | |
0ce1a794 | 1130 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
f8d4de6e | 1131 | object_name, ofs, inbound_size, NULL, |
602adf40 YS |
1132 | pages, num_pages, |
1133 | flags, | |
1134 | ops, | |
1fec7093 | 1135 | NULL, 0, |
59c2be1e YS |
1136 | NULL, |
1137 | linger_req, ver); | |
602adf40 | 1138 | if (ret < 0) |
913d2fdc | 1139 | goto done; |
602adf40 | 1140 | |
f8d4de6e AE |
1141 | if ((flags & CEPH_OSD_FLAG_READ) && inbound) |
1142 | ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret); | |
602adf40 | 1143 | |
602adf40 YS |
1144 | done: |
1145 | ceph_release_page_vector(pages, num_pages); | |
1146 | return ret; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Do an asynchronous ceph osd operation | |
1151 | */ | |
1152 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1153 | struct rbd_device *rbd_dev, |
602adf40 YS |
1154 | struct ceph_snap_context *snapc, |
1155 | u64 snapid, | |
d1f57ea6 | 1156 | int opcode, int flags, |
602adf40 | 1157 | u64 ofs, u64 len, |
1fec7093 YS |
1158 | struct bio *bio, |
1159 | struct rbd_req_coll *coll, | |
1160 | int coll_index) | |
602adf40 YS |
1161 | { |
1162 | char *seg_name; | |
1163 | u64 seg_ofs; | |
1164 | u64 seg_len; | |
1165 | int ret; | |
1166 | struct ceph_osd_req_op *ops; | |
1167 | u32 payload_len; | |
1168 | ||
65ccfe21 | 1169 | seg_name = rbd_segment_name(rbd_dev, ofs); |
602adf40 YS |
1170 | if (!seg_name) |
1171 | return -ENOMEM; | |
65ccfe21 AE |
1172 | seg_len = rbd_segment_length(rbd_dev, ofs, len); |
1173 | seg_ofs = rbd_segment_offset(rbd_dev, ofs); | |
602adf40 YS |
1174 | |
1175 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1176 | ||
57cfc106 AE |
1177 | ret = -ENOMEM; |
1178 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1179 | if (!ops) | |
602adf40 YS |
1180 | goto done; |
1181 | ||
1182 | /* we've taken care of segment sizes earlier when we | |
1183 | cloned the bios. We should never have a segment | |
1184 | truncated at this point */ | |
aafb230e | 1185 | rbd_assert(seg_len == len); |
602adf40 YS |
1186 | |
1187 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1188 | seg_name, seg_ofs, seg_len, | |
1189 | bio, | |
1190 | NULL, 0, | |
1191 | flags, | |
1192 | ops, | |
1fec7093 | 1193 | coll, coll_index, |
59c2be1e | 1194 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1195 | |
1196 | rbd_destroy_ops(ops); | |
602adf40 YS |
1197 | done: |
1198 | kfree(seg_name); | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * Request async osd write | |
1204 | */ | |
1205 | static int rbd_req_write(struct request *rq, | |
1206 | struct rbd_device *rbd_dev, | |
1207 | struct ceph_snap_context *snapc, | |
1208 | u64 ofs, u64 len, | |
1fec7093 YS |
1209 | struct bio *bio, |
1210 | struct rbd_req_coll *coll, | |
1211 | int coll_index) | |
602adf40 YS |
1212 | { |
1213 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1214 | CEPH_OSD_OP_WRITE, | |
1215 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1216 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1217 | } |
1218 | ||
1219 | /* | |
1220 | * Request async osd read | |
1221 | */ | |
1222 | static int rbd_req_read(struct request *rq, | |
1223 | struct rbd_device *rbd_dev, | |
1224 | u64 snapid, | |
1225 | u64 ofs, u64 len, | |
1fec7093 YS |
1226 | struct bio *bio, |
1227 | struct rbd_req_coll *coll, | |
1228 | int coll_index) | |
602adf40 YS |
1229 | { |
1230 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1231 | snapid, |
602adf40 YS |
1232 | CEPH_OSD_OP_READ, |
1233 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1234 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1235 | } |
1236 | ||
1237 | /* | |
1238 | * Request sync osd read | |
1239 | */ | |
0ce1a794 | 1240 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1241 | u64 snapid, |
aded07ea | 1242 | const char *object_name, |
602adf40 | 1243 | u64 ofs, u64 len, |
59c2be1e YS |
1244 | char *buf, |
1245 | u64 *ver) | |
602adf40 | 1246 | { |
913d2fdc AE |
1247 | struct ceph_osd_req_op *ops; |
1248 | int ret; | |
1249 | ||
1250 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1251 | if (!ops) | |
1252 | return -ENOMEM; | |
1253 | ||
1254 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1255 | snapid, |
602adf40 | 1256 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1257 | ops, object_name, ofs, len, buf, NULL, ver); |
1258 | rbd_destroy_ops(ops); | |
1259 | ||
1260 | return ret; | |
602adf40 YS |
1261 | } |
1262 | ||
1263 | /* | |
59c2be1e YS |
1264 | * Request sync osd watch |
1265 | */ | |
0ce1a794 | 1266 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1267 | u64 ver, |
7f0a24d8 | 1268 | u64 notify_id) |
59c2be1e YS |
1269 | { |
1270 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1271 | int ret; |
1272 | ||
57cfc106 AE |
1273 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1274 | if (!ops) | |
1275 | return -ENOMEM; | |
59c2be1e | 1276 | |
a71b891b | 1277 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1278 | ops[0].watch.cookie = notify_id; |
1279 | ops[0].watch.flag = 0; | |
1280 | ||
0ce1a794 | 1281 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1282 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1283 | NULL, 0, |
59c2be1e YS |
1284 | CEPH_OSD_FLAG_READ, |
1285 | ops, | |
1fec7093 | 1286 | NULL, 0, |
59c2be1e YS |
1287 | rbd_simple_req_cb, 0, NULL); |
1288 | ||
1289 | rbd_destroy_ops(ops); | |
1290 | return ret; | |
1291 | } | |
1292 | ||
1293 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1294 | { | |
0ce1a794 | 1295 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1296 | u64 hver; |
13143d2d SW |
1297 | int rc; |
1298 | ||
0ce1a794 | 1299 | if (!rbd_dev) |
59c2be1e YS |
1300 | return; |
1301 | ||
bd919d45 AE |
1302 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1303 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1304 | (unsigned int) opcode); | |
1fe5e993 | 1305 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1306 | if (rc) |
f0f8cef5 | 1307 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1308 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1309 | |
7f0a24d8 | 1310 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1311 | } |
1312 | ||
1313 | /* | |
1314 | * Request sync osd watch | |
1315 | */ | |
0e6f322d | 1316 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1317 | { |
1318 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1319 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1320 | int ret; |
59c2be1e | 1321 | |
57cfc106 AE |
1322 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1323 | if (!ops) | |
1324 | return -ENOMEM; | |
59c2be1e YS |
1325 | |
1326 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1327 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1328 | if (ret < 0) |
1329 | goto fail; | |
1330 | ||
0e6f322d | 1331 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1332 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1333 | ops[0].watch.flag = 1; |
1334 | ||
0ce1a794 | 1335 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1336 | CEPH_NOSNAP, |
59c2be1e YS |
1337 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1338 | ops, | |
0e6f322d AE |
1339 | rbd_dev->header_name, |
1340 | 0, 0, NULL, | |
0ce1a794 | 1341 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1342 | |
1343 | if (ret < 0) | |
1344 | goto fail_event; | |
1345 | ||
1346 | rbd_destroy_ops(ops); | |
1347 | return 0; | |
1348 | ||
1349 | fail_event: | |
0ce1a794 AE |
1350 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1351 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1352 | fail: |
1353 | rbd_destroy_ops(ops); | |
1354 | return ret; | |
1355 | } | |
1356 | ||
79e3057c YS |
1357 | /* |
1358 | * Request sync osd unwatch | |
1359 | */ | |
070c633f | 1360 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1361 | { |
1362 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1363 | int ret; |
79e3057c | 1364 | |
57cfc106 AE |
1365 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1366 | if (!ops) | |
1367 | return -ENOMEM; | |
79e3057c YS |
1368 | |
1369 | ops[0].watch.ver = 0; | |
0ce1a794 | 1370 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1371 | ops[0].watch.flag = 0; |
1372 | ||
0ce1a794 | 1373 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1374 | CEPH_NOSNAP, |
79e3057c YS |
1375 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1376 | ops, | |
070c633f AE |
1377 | rbd_dev->header_name, |
1378 | 0, 0, NULL, NULL, NULL); | |
1379 | ||
79e3057c YS |
1380 | |
1381 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1382 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1383 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1384 | return ret; |
1385 | } | |
1386 | ||
602adf40 | 1387 | /* |
3cb4a687 | 1388 | * Synchronous osd object method call |
602adf40 | 1389 | */ |
0ce1a794 | 1390 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1391 | const char *object_name, |
1392 | const char *class_name, | |
1393 | const char *method_name, | |
3cb4a687 AE |
1394 | const char *outbound, |
1395 | size_t outbound_size, | |
f8d4de6e AE |
1396 | char *inbound, |
1397 | size_t inbound_size, | |
3cb4a687 | 1398 | int flags, |
59c2be1e | 1399 | u64 *ver) |
602adf40 YS |
1400 | { |
1401 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1402 | int class_name_len = strlen(class_name); |
1403 | int method_name_len = strlen(method_name); | |
3cb4a687 | 1404 | int payload_size; |
57cfc106 AE |
1405 | int ret; |
1406 | ||
3cb4a687 AE |
1407 | /* |
1408 | * Any input parameters required by the method we're calling | |
1409 | * will be sent along with the class and method names as | |
1410 | * part of the message payload. That data and its size are | |
1411 | * supplied via the indata and indata_len fields (named from | |
1412 | * the perspective of the server side) in the OSD request | |
1413 | * operation. | |
1414 | */ | |
1415 | payload_size = class_name_len + method_name_len + outbound_size; | |
1416 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size); | |
57cfc106 AE |
1417 | if (!ops) |
1418 | return -ENOMEM; | |
602adf40 | 1419 | |
aded07ea AE |
1420 | ops[0].cls.class_name = class_name; |
1421 | ops[0].cls.class_len = (__u8) class_name_len; | |
1422 | ops[0].cls.method_name = method_name; | |
1423 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 | 1424 | ops[0].cls.argc = 0; |
3cb4a687 AE |
1425 | ops[0].cls.indata = outbound; |
1426 | ops[0].cls.indata_len = outbound_size; | |
602adf40 | 1427 | |
0ce1a794 | 1428 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1429 | CEPH_NOSNAP, |
3cb4a687 | 1430 | flags, ops, |
f8d4de6e AE |
1431 | object_name, 0, inbound_size, inbound, |
1432 | NULL, ver); | |
602adf40 YS |
1433 | |
1434 | rbd_destroy_ops(ops); | |
1435 | ||
1436 | dout("cls_exec returned %d\n", ret); | |
1437 | return ret; | |
1438 | } | |
1439 | ||
1fec7093 YS |
1440 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1441 | { | |
1442 | struct rbd_req_coll *coll = | |
1443 | kzalloc(sizeof(struct rbd_req_coll) + | |
1444 | sizeof(struct rbd_req_status) * num_reqs, | |
1445 | GFP_ATOMIC); | |
1446 | ||
1447 | if (!coll) | |
1448 | return NULL; | |
1449 | coll->total = num_reqs; | |
1450 | kref_init(&coll->kref); | |
1451 | return coll; | |
1452 | } | |
1453 | ||
602adf40 YS |
1454 | /* |
1455 | * block device queue callback | |
1456 | */ | |
1457 | static void rbd_rq_fn(struct request_queue *q) | |
1458 | { | |
1459 | struct rbd_device *rbd_dev = q->queuedata; | |
1460 | struct request *rq; | |
1461 | struct bio_pair *bp = NULL; | |
1462 | ||
00f1f36f | 1463 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1464 | struct bio *bio; |
1465 | struct bio *rq_bio, *next_bio = NULL; | |
1466 | bool do_write; | |
bd919d45 AE |
1467 | unsigned int size; |
1468 | u64 op_size = 0; | |
602adf40 | 1469 | u64 ofs; |
1fec7093 YS |
1470 | int num_segs, cur_seg = 0; |
1471 | struct rbd_req_coll *coll; | |
d1d25646 | 1472 | struct ceph_snap_context *snapc; |
602adf40 | 1473 | |
602adf40 YS |
1474 | dout("fetched request\n"); |
1475 | ||
1476 | /* filter out block requests we don't understand */ | |
1477 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1478 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1479 | continue; |
602adf40 YS |
1480 | } |
1481 | ||
1482 | /* deduce our operation (read, write) */ | |
1483 | do_write = (rq_data_dir(rq) == WRITE); | |
1484 | ||
1485 | size = blk_rq_bytes(rq); | |
593a9e7b | 1486 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 | 1487 | rq_bio = rq->bio; |
f84344f3 | 1488 | if (do_write && rbd_dev->mapping.read_only) { |
602adf40 | 1489 | __blk_end_request_all(rq, -EROFS); |
00f1f36f | 1490 | continue; |
602adf40 YS |
1491 | } |
1492 | ||
1493 | spin_unlock_irq(q->queue_lock); | |
1494 | ||
d1d25646 | 1495 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1496 | |
f84344f3 AE |
1497 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP && |
1498 | !rbd_dev->mapping.snap_exists) { | |
e88a36ec | 1499 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1500 | dout("request for non-existent snapshot"); |
1501 | spin_lock_irq(q->queue_lock); | |
1502 | __blk_end_request_all(rq, -ENXIO); | |
1503 | continue; | |
e88a36ec JD |
1504 | } |
1505 | ||
d1d25646 JD |
1506 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1507 | ||
1508 | up_read(&rbd_dev->header_rwsem); | |
1509 | ||
602adf40 YS |
1510 | dout("%s 0x%x bytes at 0x%llx\n", |
1511 | do_write ? "write" : "read", | |
bd919d45 | 1512 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1513 | |
1fec7093 | 1514 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
df111be6 AE |
1515 | if (num_segs <= 0) { |
1516 | spin_lock_irq(q->queue_lock); | |
1517 | __blk_end_request_all(rq, num_segs); | |
1518 | ceph_put_snap_context(snapc); | |
1519 | continue; | |
1520 | } | |
1fec7093 YS |
1521 | coll = rbd_alloc_coll(num_segs); |
1522 | if (!coll) { | |
1523 | spin_lock_irq(q->queue_lock); | |
1524 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1525 | ceph_put_snap_context(snapc); |
00f1f36f | 1526 | continue; |
1fec7093 YS |
1527 | } |
1528 | ||
602adf40 YS |
1529 | do { |
1530 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1531 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
65ccfe21 | 1532 | op_size = rbd_segment_length(rbd_dev, ofs, size); |
1fec7093 | 1533 | kref_get(&coll->kref); |
602adf40 YS |
1534 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1535 | op_size, GFP_ATOMIC); | |
1536 | if (!bio) { | |
1fec7093 YS |
1537 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1538 | -ENOMEM, op_size); | |
1539 | goto next_seg; | |
602adf40 YS |
1540 | } |
1541 | ||
1fec7093 | 1542 | |
602adf40 YS |
1543 | /* init OSD command: write or read */ |
1544 | if (do_write) | |
1545 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1546 | snapc, |
602adf40 | 1547 | ofs, |
1fec7093 YS |
1548 | op_size, bio, |
1549 | coll, cur_seg); | |
602adf40 YS |
1550 | else |
1551 | rbd_req_read(rq, rbd_dev, | |
f84344f3 | 1552 | rbd_dev->mapping.snap_id, |
602adf40 | 1553 | ofs, |
1fec7093 YS |
1554 | op_size, bio, |
1555 | coll, cur_seg); | |
602adf40 | 1556 | |
1fec7093 | 1557 | next_seg: |
602adf40 YS |
1558 | size -= op_size; |
1559 | ofs += op_size; | |
1560 | ||
1fec7093 | 1561 | cur_seg++; |
602adf40 YS |
1562 | rq_bio = next_bio; |
1563 | } while (size > 0); | |
1fec7093 | 1564 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1565 | |
1566 | if (bp) | |
1567 | bio_pair_release(bp); | |
602adf40 | 1568 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1569 | |
1570 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1571 | } |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1576 | * multiple osd objects. One exception would be with a single page bios, | |
1577 | * which we handle later at bio_chain_clone | |
1578 | */ | |
1579 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1580 | struct bio_vec *bvec) | |
1581 | { | |
1582 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1583 | unsigned int chunk_sectors; |
1584 | sector_t sector; | |
1585 | unsigned int bio_sectors; | |
602adf40 YS |
1586 | int max; |
1587 | ||
593a9e7b AE |
1588 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1589 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1590 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1591 | ||
602adf40 | 1592 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1593 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1594 | if (max < 0) |
1595 | max = 0; /* bio_add cannot handle a negative return */ | |
1596 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1597 | return bvec->bv_len; | |
1598 | return max; | |
1599 | } | |
1600 | ||
1601 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1602 | { | |
1603 | struct gendisk *disk = rbd_dev->disk; | |
1604 | ||
1605 | if (!disk) | |
1606 | return; | |
1607 | ||
602adf40 YS |
1608 | if (disk->flags & GENHD_FL_UP) |
1609 | del_gendisk(disk); | |
1610 | if (disk->queue) | |
1611 | blk_cleanup_queue(disk->queue); | |
1612 | put_disk(disk); | |
1613 | } | |
1614 | ||
1615 | /* | |
4156d998 AE |
1616 | * Read the complete header for the given rbd device. |
1617 | * | |
1618 | * Returns a pointer to a dynamically-allocated buffer containing | |
1619 | * the complete and validated header. Caller can pass the address | |
1620 | * of a variable that will be filled in with the version of the | |
1621 | * header object at the time it was read. | |
1622 | * | |
1623 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1624 | */ |
4156d998 AE |
1625 | static struct rbd_image_header_ondisk * |
1626 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1627 | { |
4156d998 | 1628 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1629 | u32 snap_count = 0; |
4156d998 AE |
1630 | u64 names_size = 0; |
1631 | u32 want_count; | |
1632 | int ret; | |
602adf40 | 1633 | |
00f1f36f | 1634 | /* |
4156d998 AE |
1635 | * The complete header will include an array of its 64-bit |
1636 | * snapshot ids, followed by the names of those snapshots as | |
1637 | * a contiguous block of NUL-terminated strings. Note that | |
1638 | * the number of snapshots could change by the time we read | |
1639 | * it in, in which case we re-read it. | |
00f1f36f | 1640 | */ |
4156d998 AE |
1641 | do { |
1642 | size_t size; | |
1643 | ||
1644 | kfree(ondisk); | |
1645 | ||
1646 | size = sizeof (*ondisk); | |
1647 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1648 | size += names_size; | |
1649 | ondisk = kmalloc(size, GFP_KERNEL); | |
1650 | if (!ondisk) | |
1651 | return ERR_PTR(-ENOMEM); | |
1652 | ||
1653 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1654 | rbd_dev->header_name, |
4156d998 AE |
1655 | 0, size, |
1656 | (char *) ondisk, version); | |
1657 | ||
1658 | if (ret < 0) | |
1659 | goto out_err; | |
1660 | if (WARN_ON((size_t) ret < size)) { | |
1661 | ret = -ENXIO; | |
1662 | pr_warning("short header read for image %s" | |
1663 | " (want %zd got %d)\n", | |
1664 | rbd_dev->image_name, size, ret); | |
1665 | goto out_err; | |
1666 | } | |
1667 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1668 | ret = -ENXIO; | |
1669 | pr_warning("invalid header for image %s\n", | |
1670 | rbd_dev->image_name); | |
1671 | goto out_err; | |
81e759fb | 1672 | } |
602adf40 | 1673 | |
4156d998 AE |
1674 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1675 | want_count = snap_count; | |
1676 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1677 | } while (snap_count != want_count); | |
00f1f36f | 1678 | |
4156d998 | 1679 | return ondisk; |
00f1f36f | 1680 | |
4156d998 AE |
1681 | out_err: |
1682 | kfree(ondisk); | |
1683 | ||
1684 | return ERR_PTR(ret); | |
1685 | } | |
1686 | ||
1687 | /* | |
1688 | * reload the ondisk the header | |
1689 | */ | |
1690 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1691 | struct rbd_image_header *header) | |
1692 | { | |
1693 | struct rbd_image_header_ondisk *ondisk; | |
1694 | u64 ver = 0; | |
1695 | int ret; | |
602adf40 | 1696 | |
4156d998 AE |
1697 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1698 | if (IS_ERR(ondisk)) | |
1699 | return PTR_ERR(ondisk); | |
1700 | ret = rbd_header_from_disk(header, ondisk); | |
1701 | if (ret >= 0) | |
1702 | header->obj_version = ver; | |
1703 | kfree(ondisk); | |
1704 | ||
1705 | return ret; | |
602adf40 YS |
1706 | } |
1707 | ||
dfc5606d YS |
1708 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1709 | { | |
1710 | struct rbd_snap *snap; | |
a0593290 | 1711 | struct rbd_snap *next; |
dfc5606d | 1712 | |
a0593290 | 1713 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1714 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1715 | } |
1716 | ||
602adf40 YS |
1717 | /* |
1718 | * only read the first part of the ondisk header, without the snaps info | |
1719 | */ | |
b813623a | 1720 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1721 | { |
1722 | int ret; | |
1723 | struct rbd_image_header h; | |
602adf40 YS |
1724 | |
1725 | ret = rbd_read_header(rbd_dev, &h); | |
1726 | if (ret < 0) | |
1727 | return ret; | |
1728 | ||
a51aa0c0 JD |
1729 | down_write(&rbd_dev->header_rwsem); |
1730 | ||
9db4b3e3 | 1731 | /* resized? */ |
f84344f3 | 1732 | if (rbd_dev->mapping.snap_id == CEPH_NOSNAP) { |
474ef7ce JD |
1733 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; |
1734 | ||
99c1f08f AE |
1735 | if (size != (sector_t) rbd_dev->mapping.size) { |
1736 | dout("setting size to %llu sectors", | |
1737 | (unsigned long long) size); | |
1738 | rbd_dev->mapping.size = (u64) size; | |
1739 | set_capacity(rbd_dev->disk, size); | |
1740 | } | |
474ef7ce | 1741 | } |
9db4b3e3 | 1742 | |
849b4260 | 1743 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1744 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1745 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1746 | /* osd requests may still refer to snapc */ |
1747 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1748 | |
b813623a AE |
1749 | if (hver) |
1750 | *hver = h.obj_version; | |
a71b891b | 1751 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1752 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1753 | rbd_dev->header.snapc = h.snapc; |
1754 | rbd_dev->header.snap_names = h.snap_names; | |
1755 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1756 | /* Free the extra copy of the object prefix */ |
1757 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1758 | kfree(h.object_prefix); | |
1759 | ||
304f6808 AE |
1760 | ret = rbd_dev_snaps_update(rbd_dev); |
1761 | if (!ret) | |
1762 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 1763 | |
c666601a | 1764 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1765 | |
dfc5606d | 1766 | return ret; |
602adf40 YS |
1767 | } |
1768 | ||
1fe5e993 AE |
1769 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1770 | { | |
1771 | int ret; | |
1772 | ||
1773 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1774 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1775 | mutex_unlock(&ctl_mutex); | |
1776 | ||
1777 | return ret; | |
1778 | } | |
1779 | ||
602adf40 YS |
1780 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1781 | { | |
1782 | struct gendisk *disk; | |
1783 | struct request_queue *q; | |
593a9e7b | 1784 | u64 segment_size; |
602adf40 | 1785 | |
602adf40 | 1786 | /* create gendisk info */ |
602adf40 YS |
1787 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
1788 | if (!disk) | |
1fcdb8aa | 1789 | return -ENOMEM; |
602adf40 | 1790 | |
f0f8cef5 | 1791 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1792 | rbd_dev->dev_id); |
602adf40 YS |
1793 | disk->major = rbd_dev->major; |
1794 | disk->first_minor = 0; | |
1795 | disk->fops = &rbd_bd_ops; | |
1796 | disk->private_data = rbd_dev; | |
1797 | ||
1798 | /* init rq */ | |
602adf40 YS |
1799 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
1800 | if (!q) | |
1801 | goto out_disk; | |
029bcbd8 | 1802 | |
593a9e7b AE |
1803 | /* We use the default size, but let's be explicit about it. */ |
1804 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1805 | ||
029bcbd8 | 1806 | /* set io sizes to object size */ |
593a9e7b AE |
1807 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1808 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1809 | blk_queue_max_segment_size(q, segment_size); | |
1810 | blk_queue_io_min(q, segment_size); | |
1811 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1812 | |
602adf40 YS |
1813 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1814 | disk->queue = q; | |
1815 | ||
1816 | q->queuedata = rbd_dev; | |
1817 | ||
1818 | rbd_dev->disk = disk; | |
602adf40 | 1819 | |
12f02944 AE |
1820 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
1821 | ||
602adf40 | 1822 | return 0; |
602adf40 YS |
1823 | out_disk: |
1824 | put_disk(disk); | |
1fcdb8aa AE |
1825 | |
1826 | return -ENOMEM; | |
602adf40 YS |
1827 | } |
1828 | ||
dfc5606d YS |
1829 | /* |
1830 | sysfs | |
1831 | */ | |
1832 | ||
593a9e7b AE |
1833 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1834 | { | |
1835 | return container_of(dev, struct rbd_device, dev); | |
1836 | } | |
1837 | ||
dfc5606d YS |
1838 | static ssize_t rbd_size_show(struct device *dev, |
1839 | struct device_attribute *attr, char *buf) | |
1840 | { | |
593a9e7b | 1841 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1842 | sector_t size; |
1843 | ||
1844 | down_read(&rbd_dev->header_rwsem); | |
1845 | size = get_capacity(rbd_dev->disk); | |
1846 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1847 | |
a51aa0c0 | 1848 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1849 | } |
1850 | ||
34b13184 AE |
1851 | /* |
1852 | * Note this shows the features for whatever's mapped, which is not | |
1853 | * necessarily the base image. | |
1854 | */ | |
1855 | static ssize_t rbd_features_show(struct device *dev, | |
1856 | struct device_attribute *attr, char *buf) | |
1857 | { | |
1858 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1859 | ||
1860 | return sprintf(buf, "0x%016llx\n", | |
1861 | (unsigned long long) rbd_dev->mapping.features); | |
1862 | } | |
1863 | ||
dfc5606d YS |
1864 | static ssize_t rbd_major_show(struct device *dev, |
1865 | struct device_attribute *attr, char *buf) | |
1866 | { | |
593a9e7b | 1867 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1868 | |
dfc5606d YS |
1869 | return sprintf(buf, "%d\n", rbd_dev->major); |
1870 | } | |
1871 | ||
1872 | static ssize_t rbd_client_id_show(struct device *dev, | |
1873 | struct device_attribute *attr, char *buf) | |
602adf40 | 1874 | { |
593a9e7b | 1875 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1876 | |
1dbb4399 AE |
1877 | return sprintf(buf, "client%lld\n", |
1878 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1879 | } |
1880 | ||
dfc5606d YS |
1881 | static ssize_t rbd_pool_show(struct device *dev, |
1882 | struct device_attribute *attr, char *buf) | |
602adf40 | 1883 | { |
593a9e7b | 1884 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1885 | |
1886 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1887 | } | |
1888 | ||
9bb2f334 AE |
1889 | static ssize_t rbd_pool_id_show(struct device *dev, |
1890 | struct device_attribute *attr, char *buf) | |
1891 | { | |
1892 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1893 | ||
1894 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1895 | } | |
1896 | ||
dfc5606d YS |
1897 | static ssize_t rbd_name_show(struct device *dev, |
1898 | struct device_attribute *attr, char *buf) | |
1899 | { | |
593a9e7b | 1900 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1901 | |
0bed54dc | 1902 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1903 | } |
1904 | ||
589d30e0 AE |
1905 | static ssize_t rbd_image_id_show(struct device *dev, |
1906 | struct device_attribute *attr, char *buf) | |
1907 | { | |
1908 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1909 | ||
1910 | return sprintf(buf, "%s\n", rbd_dev->image_id); | |
1911 | } | |
1912 | ||
34b13184 AE |
1913 | /* |
1914 | * Shows the name of the currently-mapped snapshot (or | |
1915 | * RBD_SNAP_HEAD_NAME for the base image). | |
1916 | */ | |
dfc5606d YS |
1917 | static ssize_t rbd_snap_show(struct device *dev, |
1918 | struct device_attribute *attr, | |
1919 | char *buf) | |
1920 | { | |
593a9e7b | 1921 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1922 | |
f84344f3 | 1923 | return sprintf(buf, "%s\n", rbd_dev->mapping.snap_name); |
dfc5606d YS |
1924 | } |
1925 | ||
1926 | static ssize_t rbd_image_refresh(struct device *dev, | |
1927 | struct device_attribute *attr, | |
1928 | const char *buf, | |
1929 | size_t size) | |
1930 | { | |
593a9e7b | 1931 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1932 | int ret; |
602adf40 | 1933 | |
1fe5e993 | 1934 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1935 | |
1936 | return ret < 0 ? ret : size; | |
dfc5606d | 1937 | } |
602adf40 | 1938 | |
dfc5606d | 1939 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 1940 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
1941 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
1942 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1943 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1944 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 1945 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 1946 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
1947 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
1948 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
dfc5606d YS |
1949 | |
1950 | static struct attribute *rbd_attrs[] = { | |
1951 | &dev_attr_size.attr, | |
34b13184 | 1952 | &dev_attr_features.attr, |
dfc5606d YS |
1953 | &dev_attr_major.attr, |
1954 | &dev_attr_client_id.attr, | |
1955 | &dev_attr_pool.attr, | |
9bb2f334 | 1956 | &dev_attr_pool_id.attr, |
dfc5606d | 1957 | &dev_attr_name.attr, |
589d30e0 | 1958 | &dev_attr_image_id.attr, |
dfc5606d YS |
1959 | &dev_attr_current_snap.attr, |
1960 | &dev_attr_refresh.attr, | |
dfc5606d YS |
1961 | NULL |
1962 | }; | |
1963 | ||
1964 | static struct attribute_group rbd_attr_group = { | |
1965 | .attrs = rbd_attrs, | |
1966 | }; | |
1967 | ||
1968 | static const struct attribute_group *rbd_attr_groups[] = { | |
1969 | &rbd_attr_group, | |
1970 | NULL | |
1971 | }; | |
1972 | ||
1973 | static void rbd_sysfs_dev_release(struct device *dev) | |
1974 | { | |
1975 | } | |
1976 | ||
1977 | static struct device_type rbd_device_type = { | |
1978 | .name = "rbd", | |
1979 | .groups = rbd_attr_groups, | |
1980 | .release = rbd_sysfs_dev_release, | |
1981 | }; | |
1982 | ||
1983 | ||
1984 | /* | |
1985 | sysfs - snapshots | |
1986 | */ | |
1987 | ||
1988 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1989 | struct device_attribute *attr, | |
1990 | char *buf) | |
1991 | { | |
1992 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1993 | ||
3591538f | 1994 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
1995 | } |
1996 | ||
1997 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1998 | struct device_attribute *attr, | |
1999 | char *buf) | |
2000 | { | |
2001 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2002 | ||
3591538f | 2003 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2004 | } |
2005 | ||
34b13184 AE |
2006 | static ssize_t rbd_snap_features_show(struct device *dev, |
2007 | struct device_attribute *attr, | |
2008 | char *buf) | |
2009 | { | |
2010 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2011 | ||
2012 | return sprintf(buf, "0x%016llx\n", | |
2013 | (unsigned long long) snap->features); | |
2014 | } | |
2015 | ||
dfc5606d YS |
2016 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2017 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 2018 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
2019 | |
2020 | static struct attribute *rbd_snap_attrs[] = { | |
2021 | &dev_attr_snap_size.attr, | |
2022 | &dev_attr_snap_id.attr, | |
34b13184 | 2023 | &dev_attr_snap_features.attr, |
dfc5606d YS |
2024 | NULL, |
2025 | }; | |
2026 | ||
2027 | static struct attribute_group rbd_snap_attr_group = { | |
2028 | .attrs = rbd_snap_attrs, | |
2029 | }; | |
2030 | ||
2031 | static void rbd_snap_dev_release(struct device *dev) | |
2032 | { | |
2033 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2034 | kfree(snap->name); | |
2035 | kfree(snap); | |
2036 | } | |
2037 | ||
2038 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2039 | &rbd_snap_attr_group, | |
2040 | NULL | |
2041 | }; | |
2042 | ||
2043 | static struct device_type rbd_snap_device_type = { | |
2044 | .groups = rbd_snap_attr_groups, | |
2045 | .release = rbd_snap_dev_release, | |
2046 | }; | |
2047 | ||
304f6808 AE |
2048 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2049 | { | |
2050 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
2051 | bool reg = device_is_registered(&snap->dev); | |
2052 | ||
2053 | rbd_assert(!ret ^ reg); | |
2054 | ||
2055 | return ret; | |
2056 | } | |
2057 | ||
14e7085d | 2058 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2059 | { |
2060 | list_del(&snap->node); | |
304f6808 AE |
2061 | if (device_is_registered(&snap->dev)) |
2062 | device_unregister(&snap->dev); | |
dfc5606d YS |
2063 | } |
2064 | ||
14e7085d | 2065 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2066 | struct device *parent) |
2067 | { | |
2068 | struct device *dev = &snap->dev; | |
2069 | int ret; | |
2070 | ||
2071 | dev->type = &rbd_snap_device_type; | |
2072 | dev->parent = parent; | |
2073 | dev->release = rbd_snap_dev_release; | |
2074 | dev_set_name(dev, "snap_%s", snap->name); | |
304f6808 AE |
2075 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2076 | ||
dfc5606d YS |
2077 | ret = device_register(dev); |
2078 | ||
2079 | return ret; | |
2080 | } | |
2081 | ||
4e891e0a | 2082 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 2083 | const char *snap_name, |
34b13184 AE |
2084 | u64 snap_id, u64 snap_size, |
2085 | u64 snap_features) | |
dfc5606d | 2086 | { |
4e891e0a | 2087 | struct rbd_snap *snap; |
dfc5606d | 2088 | int ret; |
4e891e0a AE |
2089 | |
2090 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2091 | if (!snap) |
4e891e0a AE |
2092 | return ERR_PTR(-ENOMEM); |
2093 | ||
2094 | ret = -ENOMEM; | |
c8d18425 | 2095 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
2096 | if (!snap->name) |
2097 | goto err; | |
2098 | ||
c8d18425 AE |
2099 | snap->id = snap_id; |
2100 | snap->size = snap_size; | |
34b13184 | 2101 | snap->features = snap_features; |
4e891e0a AE |
2102 | |
2103 | return snap; | |
2104 | ||
dfc5606d YS |
2105 | err: |
2106 | kfree(snap->name); | |
2107 | kfree(snap); | |
4e891e0a AE |
2108 | |
2109 | return ERR_PTR(ret); | |
dfc5606d YS |
2110 | } |
2111 | ||
cd892126 AE |
2112 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2113 | u64 *snap_size, u64 *snap_features) | |
2114 | { | |
2115 | char *snap_name; | |
2116 | ||
2117 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
2118 | ||
2119 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
2120 | *snap_features = 0; /* No features for v1 */ | |
2121 | ||
2122 | /* Skip over names until we find the one we are looking for */ | |
2123 | ||
2124 | snap_name = rbd_dev->header.snap_names; | |
2125 | while (which--) | |
2126 | snap_name += strlen(snap_name) + 1; | |
2127 | ||
2128 | return snap_name; | |
2129 | } | |
2130 | ||
9d475de5 AE |
2131 | /* |
2132 | * Get the size and object order for an image snapshot, or if | |
2133 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
2134 | * image. | |
2135 | */ | |
2136 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
2137 | u8 *order, u64 *snap_size) | |
2138 | { | |
2139 | __le64 snapid = cpu_to_le64(snap_id); | |
2140 | int ret; | |
2141 | struct { | |
2142 | u8 order; | |
2143 | __le64 size; | |
2144 | } __attribute__ ((packed)) size_buf = { 0 }; | |
2145 | ||
2146 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2147 | "rbd", "get_size", | |
2148 | (char *) &snapid, sizeof (snapid), | |
2149 | (char *) &size_buf, sizeof (size_buf), | |
2150 | CEPH_OSD_FLAG_READ, NULL); | |
2151 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2152 | if (ret < 0) | |
2153 | return ret; | |
2154 | ||
2155 | *order = size_buf.order; | |
2156 | *snap_size = le64_to_cpu(size_buf.size); | |
2157 | ||
2158 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
2159 | (unsigned long long) snap_id, (unsigned int) *order, | |
2160 | (unsigned long long) *snap_size); | |
2161 | ||
2162 | return 0; | |
2163 | } | |
2164 | ||
2165 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
2166 | { | |
2167 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
2168 | &rbd_dev->header.obj_order, | |
2169 | &rbd_dev->header.image_size); | |
2170 | } | |
2171 | ||
1e130199 AE |
2172 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2173 | { | |
2174 | void *reply_buf; | |
2175 | int ret; | |
2176 | void *p; | |
2177 | ||
2178 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
2179 | if (!reply_buf) | |
2180 | return -ENOMEM; | |
2181 | ||
2182 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2183 | "rbd", "get_object_prefix", | |
2184 | NULL, 0, | |
2185 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, | |
2186 | CEPH_OSD_FLAG_READ, NULL); | |
2187 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2188 | if (ret < 0) | |
2189 | goto out; | |
2190 | ||
2191 | p = reply_buf; | |
2192 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
2193 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
2194 | NULL, GFP_NOIO); | |
2195 | ||
2196 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
2197 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
2198 | rbd_dev->header.object_prefix = NULL; | |
2199 | } else { | |
2200 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
2201 | } | |
2202 | ||
2203 | out: | |
2204 | kfree(reply_buf); | |
2205 | ||
2206 | return ret; | |
2207 | } | |
2208 | ||
b1b5402a AE |
2209 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2210 | u64 *snap_features) | |
2211 | { | |
2212 | __le64 snapid = cpu_to_le64(snap_id); | |
2213 | struct { | |
2214 | __le64 features; | |
2215 | __le64 incompat; | |
2216 | } features_buf = { 0 }; | |
2217 | int ret; | |
2218 | ||
2219 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2220 | "rbd", "get_features", | |
2221 | (char *) &snapid, sizeof (snapid), | |
2222 | (char *) &features_buf, sizeof (features_buf), | |
2223 | CEPH_OSD_FLAG_READ, NULL); | |
2224 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2225 | if (ret < 0) | |
2226 | return ret; | |
2227 | *snap_features = le64_to_cpu(features_buf.features); | |
2228 | ||
2229 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
2230 | (unsigned long long) snap_id, | |
2231 | (unsigned long long) *snap_features, | |
2232 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
2233 | ||
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
2238 | { | |
2239 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
2240 | &rbd_dev->header.features); | |
2241 | } | |
2242 | ||
dfc5606d | 2243 | /* |
35938150 AE |
2244 | * Scan the rbd device's current snapshot list and compare it to the |
2245 | * newly-received snapshot context. Remove any existing snapshots | |
2246 | * not present in the new snapshot context. Add a new snapshot for | |
2247 | * any snaphots in the snapshot context not in the current list. | |
2248 | * And verify there are no changes to snapshots we already know | |
2249 | * about. | |
2250 | * | |
2251 | * Assumes the snapshots in the snapshot context are sorted by | |
2252 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2253 | * are also maintained in that order.) | |
dfc5606d | 2254 | */ |
304f6808 | 2255 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 2256 | { |
35938150 AE |
2257 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2258 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
2259 | struct list_head *head = &rbd_dev->snaps; |
2260 | struct list_head *links = head->next; | |
2261 | u32 index = 0; | |
dfc5606d | 2262 | |
9fcbb800 | 2263 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
2264 | while (index < snap_count || links != head) { |
2265 | u64 snap_id; | |
2266 | struct rbd_snap *snap; | |
cd892126 AE |
2267 | char *snap_name; |
2268 | u64 snap_size = 0; | |
2269 | u64 snap_features = 0; | |
dfc5606d | 2270 | |
35938150 AE |
2271 | snap_id = index < snap_count ? snapc->snaps[index] |
2272 | : CEPH_NOSNAP; | |
2273 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2274 | : NULL; | |
aafb230e | 2275 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 2276 | |
35938150 AE |
2277 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2278 | struct list_head *next = links->next; | |
dfc5606d | 2279 | |
35938150 | 2280 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2281 | |
f84344f3 AE |
2282 | if (rbd_dev->mapping.snap_id == snap->id) |
2283 | rbd_dev->mapping.snap_exists = false; | |
35938150 | 2284 | __rbd_remove_snap_dev(snap); |
9fcbb800 | 2285 | dout("%ssnap id %llu has been removed\n", |
f84344f3 AE |
2286 | rbd_dev->mapping.snap_id == snap->id ? |
2287 | "mapped " : "", | |
9fcbb800 | 2288 | (unsigned long long) snap->id); |
35938150 AE |
2289 | |
2290 | /* Done with this list entry; advance */ | |
2291 | ||
2292 | links = next; | |
dfc5606d YS |
2293 | continue; |
2294 | } | |
35938150 | 2295 | |
cd892126 AE |
2296 | snap_name = rbd_dev_v1_snap_info(rbd_dev, index, |
2297 | &snap_size, &snap_features); | |
2298 | if (IS_ERR(snap_name)) | |
2299 | return PTR_ERR(snap_name); | |
2300 | ||
9fcbb800 AE |
2301 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
2302 | (unsigned long long) snap_id); | |
35938150 AE |
2303 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
2304 | struct rbd_snap *new_snap; | |
2305 | ||
2306 | /* We haven't seen this snapshot before */ | |
2307 | ||
c8d18425 | 2308 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 2309 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
2310 | if (IS_ERR(new_snap)) { |
2311 | int err = PTR_ERR(new_snap); | |
2312 | ||
2313 | dout(" failed to add dev, error %d\n", err); | |
2314 | ||
2315 | return err; | |
2316 | } | |
35938150 AE |
2317 | |
2318 | /* New goes before existing, or at end of list */ | |
2319 | ||
9fcbb800 | 2320 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
2321 | if (snap) |
2322 | list_add_tail(&new_snap->node, &snap->node); | |
2323 | else | |
523f3258 | 2324 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2325 | } else { |
2326 | /* Already have this one */ | |
2327 | ||
9fcbb800 AE |
2328 | dout(" already present\n"); |
2329 | ||
cd892126 | 2330 | rbd_assert(snap->size == snap_size); |
aafb230e | 2331 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 2332 | rbd_assert(snap->features == snap_features); |
35938150 AE |
2333 | |
2334 | /* Done with this list entry; advance */ | |
2335 | ||
2336 | links = links->next; | |
dfc5606d | 2337 | } |
35938150 AE |
2338 | |
2339 | /* Advance to the next entry in the snapshot context */ | |
2340 | ||
2341 | index++; | |
dfc5606d | 2342 | } |
9fcbb800 | 2343 | dout("%s: done\n", __func__); |
dfc5606d YS |
2344 | |
2345 | return 0; | |
2346 | } | |
2347 | ||
304f6808 AE |
2348 | /* |
2349 | * Scan the list of snapshots and register the devices for any that | |
2350 | * have not already been registered. | |
2351 | */ | |
2352 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
2353 | { | |
2354 | struct rbd_snap *snap; | |
2355 | int ret = 0; | |
2356 | ||
2357 | dout("%s called\n", __func__); | |
86ff77bb AE |
2358 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
2359 | return -EIO; | |
304f6808 AE |
2360 | |
2361 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2362 | if (!rbd_snap_registered(snap)) { | |
2363 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
2364 | if (ret < 0) | |
2365 | break; | |
2366 | } | |
2367 | } | |
2368 | dout("%s: returning %d\n", __func__, ret); | |
2369 | ||
2370 | return ret; | |
2371 | } | |
2372 | ||
dfc5606d YS |
2373 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2374 | { | |
dfc5606d | 2375 | struct device *dev; |
cd789ab9 | 2376 | int ret; |
dfc5606d YS |
2377 | |
2378 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 2379 | |
cd789ab9 | 2380 | dev = &rbd_dev->dev; |
dfc5606d YS |
2381 | dev->bus = &rbd_bus_type; |
2382 | dev->type = &rbd_device_type; | |
2383 | dev->parent = &rbd_root_dev; | |
2384 | dev->release = rbd_dev_release; | |
de71a297 | 2385 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 2386 | ret = device_register(dev); |
dfc5606d | 2387 | |
dfc5606d | 2388 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 2389 | |
dfc5606d | 2390 | return ret; |
602adf40 YS |
2391 | } |
2392 | ||
dfc5606d YS |
2393 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2394 | { | |
2395 | device_unregister(&rbd_dev->dev); | |
2396 | } | |
2397 | ||
59c2be1e YS |
2398 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2399 | { | |
2400 | int ret, rc; | |
2401 | ||
2402 | do { | |
0e6f322d | 2403 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2404 | if (ret == -ERANGE) { |
1fe5e993 | 2405 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2406 | if (rc < 0) |
2407 | return rc; | |
2408 | } | |
2409 | } while (ret == -ERANGE); | |
2410 | ||
2411 | return ret; | |
2412 | } | |
2413 | ||
e2839308 | 2414 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
2415 | |
2416 | /* | |
499afd5b AE |
2417 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2418 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2419 | */ |
e2839308 | 2420 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2421 | { |
e2839308 | 2422 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
2423 | |
2424 | spin_lock(&rbd_dev_list_lock); | |
2425 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2426 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
2427 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
2428 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 2429 | } |
b7f23c36 | 2430 | |
1ddbe94e | 2431 | /* |
499afd5b AE |
2432 | * Remove an rbd_dev from the global list, and record that its |
2433 | * identifier is no longer in use. | |
1ddbe94e | 2434 | */ |
e2839308 | 2435 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2436 | { |
d184f6bf | 2437 | struct list_head *tmp; |
de71a297 | 2438 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2439 | int max_id; |
2440 | ||
aafb230e | 2441 | rbd_assert(rbd_id > 0); |
499afd5b | 2442 | |
e2839308 AE |
2443 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
2444 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
2445 | spin_lock(&rbd_dev_list_lock); |
2446 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2447 | |
2448 | /* | |
2449 | * If the id being "put" is not the current maximum, there | |
2450 | * is nothing special we need to do. | |
2451 | */ | |
e2839308 | 2452 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
2453 | spin_unlock(&rbd_dev_list_lock); |
2454 | return; | |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * We need to update the current maximum id. Search the | |
2459 | * list to find out what it is. We're more likely to find | |
2460 | * the maximum at the end, so search the list backward. | |
2461 | */ | |
2462 | max_id = 0; | |
2463 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2464 | struct rbd_device *rbd_dev; | |
2465 | ||
2466 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2467 | if (rbd_id > max_id) | |
2468 | max_id = rbd_id; | |
2469 | } | |
499afd5b | 2470 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2471 | |
1ddbe94e | 2472 | /* |
e2839308 | 2473 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
2474 | * which case it now accurately reflects the new maximum. |
2475 | * Be careful not to overwrite the maximum value in that | |
2476 | * case. | |
1ddbe94e | 2477 | */ |
e2839308 AE |
2478 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
2479 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
2480 | } |
2481 | ||
e28fff26 AE |
2482 | /* |
2483 | * Skips over white space at *buf, and updates *buf to point to the | |
2484 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2485 | * the token (string of non-white space characters) found. Note |
2486 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2487 | */ |
2488 | static inline size_t next_token(const char **buf) | |
2489 | { | |
2490 | /* | |
2491 | * These are the characters that produce nonzero for | |
2492 | * isspace() in the "C" and "POSIX" locales. | |
2493 | */ | |
2494 | const char *spaces = " \f\n\r\t\v"; | |
2495 | ||
2496 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2497 | ||
2498 | return strcspn(*buf, spaces); /* Return token length */ | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * Finds the next token in *buf, and if the provided token buffer is | |
2503 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2504 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2505 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2506 | * |
2507 | * Returns the length of the token found (not including the '\0'). | |
2508 | * Return value will be 0 if no token is found, and it will be >= | |
2509 | * token_size if the token would not fit. | |
2510 | * | |
593a9e7b | 2511 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2512 | * found token. Note that this occurs even if the token buffer is |
2513 | * too small to hold it. | |
2514 | */ | |
2515 | static inline size_t copy_token(const char **buf, | |
2516 | char *token, | |
2517 | size_t token_size) | |
2518 | { | |
2519 | size_t len; | |
2520 | ||
2521 | len = next_token(buf); | |
2522 | if (len < token_size) { | |
2523 | memcpy(token, *buf, len); | |
2524 | *(token + len) = '\0'; | |
2525 | } | |
2526 | *buf += len; | |
2527 | ||
2528 | return len; | |
2529 | } | |
2530 | ||
ea3352f4 AE |
2531 | /* |
2532 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2533 | * enough to hold a copy of it, and copies the token into the new | |
2534 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2535 | * that a duplicate buffer is created even for a zero-length token. | |
2536 | * | |
2537 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2538 | * pointer if memory for the duplicate was not available. If | |
2539 | * the lenp argument is a non-null pointer, the length of the token | |
2540 | * (not including the '\0') is returned in *lenp. | |
2541 | * | |
2542 | * If successful, the *buf pointer will be updated to point beyond | |
2543 | * the end of the found token. | |
2544 | * | |
2545 | * Note: uses GFP_KERNEL for allocation. | |
2546 | */ | |
2547 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2548 | { | |
2549 | char *dup; | |
2550 | size_t len; | |
2551 | ||
2552 | len = next_token(buf); | |
2553 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2554 | if (!dup) | |
2555 | return NULL; | |
2556 | ||
2557 | memcpy(dup, *buf, len); | |
2558 | *(dup + len) = '\0'; | |
2559 | *buf += len; | |
2560 | ||
2561 | if (lenp) | |
2562 | *lenp = len; | |
2563 | ||
2564 | return dup; | |
2565 | } | |
2566 | ||
a725f65e | 2567 | /* |
3feeb894 AE |
2568 | * This fills in the pool_name, image_name, image_name_len, rbd_dev, |
2569 | * rbd_md_name, and name fields of the given rbd_dev, based on the | |
2570 | * list of monitor addresses and other options provided via | |
2571 | * /sys/bus/rbd/add. Returns a pointer to a dynamically-allocated | |
2572 | * copy of the snapshot name to map if successful, or a | |
2573 | * pointer-coded error otherwise. | |
d22f76e7 AE |
2574 | * |
2575 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e | 2576 | */ |
3feeb894 AE |
2577 | static char *rbd_add_parse_args(struct rbd_device *rbd_dev, |
2578 | const char *buf, | |
2579 | const char **mon_addrs, | |
2580 | size_t *mon_addrs_size, | |
2581 | char *options, | |
2582 | size_t options_size) | |
e28fff26 | 2583 | { |
d22f76e7 | 2584 | size_t len; |
3feeb894 AE |
2585 | char *err_ptr = ERR_PTR(-EINVAL); |
2586 | char *snap_name; | |
e28fff26 AE |
2587 | |
2588 | /* The first four tokens are required */ | |
2589 | ||
7ef3214a AE |
2590 | len = next_token(&buf); |
2591 | if (!len) | |
3feeb894 | 2592 | return err_ptr; |
5214ecc4 | 2593 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2594 | *mon_addrs = buf; |
2595 | ||
2596 | buf += len; | |
a725f65e | 2597 | |
e28fff26 AE |
2598 | len = copy_token(&buf, options, options_size); |
2599 | if (!len || len >= options_size) | |
3feeb894 | 2600 | return err_ptr; |
e28fff26 | 2601 | |
3feeb894 | 2602 | err_ptr = ERR_PTR(-ENOMEM); |
d22f76e7 AE |
2603 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2604 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2605 | goto out_err; |
e28fff26 | 2606 | |
0bed54dc AE |
2607 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2608 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2609 | goto out_err; |
a725f65e | 2610 | |
3feeb894 AE |
2611 | /* Snapshot name is optional */ |
2612 | len = next_token(&buf); | |
820a5f3e | 2613 | if (!len) { |
3feeb894 AE |
2614 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
2615 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
849b4260 | 2616 | } |
3feeb894 AE |
2617 | snap_name = kmalloc(len + 1, GFP_KERNEL); |
2618 | if (!snap_name) | |
2619 | goto out_err; | |
2620 | memcpy(snap_name, buf, len); | |
2621 | *(snap_name + len) = '\0'; | |
e28fff26 | 2622 | |
3feeb894 AE |
2623 | dout(" SNAP_NAME is <%s>, len is %zd\n", snap_name, len); |
2624 | ||
2625 | return snap_name; | |
d22f76e7 AE |
2626 | |
2627 | out_err: | |
0bed54dc | 2628 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2629 | rbd_dev->image_name = NULL; |
2630 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2631 | kfree(rbd_dev->pool_name); |
2632 | rbd_dev->pool_name = NULL; | |
2633 | ||
3feeb894 | 2634 | return err_ptr; |
a725f65e AE |
2635 | } |
2636 | ||
589d30e0 AE |
2637 | /* |
2638 | * An rbd format 2 image has a unique identifier, distinct from the | |
2639 | * name given to it by the user. Internally, that identifier is | |
2640 | * what's used to specify the names of objects related to the image. | |
2641 | * | |
2642 | * A special "rbd id" object is used to map an rbd image name to its | |
2643 | * id. If that object doesn't exist, then there is no v2 rbd image | |
2644 | * with the supplied name. | |
2645 | * | |
2646 | * This function will record the given rbd_dev's image_id field if | |
2647 | * it can be determined, and in that case will return 0. If any | |
2648 | * errors occur a negative errno will be returned and the rbd_dev's | |
2649 | * image_id field will be unchanged (and should be NULL). | |
2650 | */ | |
2651 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
2652 | { | |
2653 | int ret; | |
2654 | size_t size; | |
2655 | char *object_name; | |
2656 | void *response; | |
2657 | void *p; | |
2658 | ||
2659 | /* | |
2660 | * First, see if the format 2 image id file exists, and if | |
2661 | * so, get the image's persistent id from it. | |
2662 | */ | |
2663 | size = sizeof (RBD_ID_PREFIX) + rbd_dev->image_name_len; | |
2664 | object_name = kmalloc(size, GFP_NOIO); | |
2665 | if (!object_name) | |
2666 | return -ENOMEM; | |
2667 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->image_name); | |
2668 | dout("rbd id object name is %s\n", object_name); | |
2669 | ||
2670 | /* Response will be an encoded string, which includes a length */ | |
2671 | ||
2672 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
2673 | response = kzalloc(size, GFP_NOIO); | |
2674 | if (!response) { | |
2675 | ret = -ENOMEM; | |
2676 | goto out; | |
2677 | } | |
2678 | ||
2679 | ret = rbd_req_sync_exec(rbd_dev, object_name, | |
2680 | "rbd", "get_id", | |
2681 | NULL, 0, | |
2682 | response, RBD_IMAGE_ID_LEN_MAX, | |
2683 | CEPH_OSD_FLAG_READ, NULL); | |
2684 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2685 | if (ret < 0) | |
2686 | goto out; | |
2687 | ||
2688 | p = response; | |
2689 | rbd_dev->image_id = ceph_extract_encoded_string(&p, | |
2690 | p + RBD_IMAGE_ID_LEN_MAX, | |
2691 | &rbd_dev->image_id_len, | |
2692 | GFP_NOIO); | |
2693 | if (IS_ERR(rbd_dev->image_id)) { | |
2694 | ret = PTR_ERR(rbd_dev->image_id); | |
2695 | rbd_dev->image_id = NULL; | |
2696 | } else { | |
2697 | dout("image_id is %s\n", rbd_dev->image_id); | |
2698 | } | |
2699 | out: | |
2700 | kfree(response); | |
2701 | kfree(object_name); | |
2702 | ||
2703 | return ret; | |
2704 | } | |
2705 | ||
a30b71b9 AE |
2706 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
2707 | { | |
2708 | int ret; | |
2709 | size_t size; | |
2710 | ||
2711 | /* Version 1 images have no id; empty string is used */ | |
2712 | ||
2713 | rbd_dev->image_id = kstrdup("", GFP_KERNEL); | |
2714 | if (!rbd_dev->image_id) | |
2715 | return -ENOMEM; | |
2716 | rbd_dev->image_id_len = 0; | |
2717 | ||
2718 | /* Record the header object name for this rbd image. */ | |
2719 | ||
2720 | size = rbd_dev->image_name_len + sizeof (RBD_SUFFIX); | |
2721 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2722 | if (!rbd_dev->header_name) { | |
2723 | ret = -ENOMEM; | |
2724 | goto out_err; | |
2725 | } | |
2726 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); | |
2727 | ||
2728 | /* Populate rbd image metadata */ | |
2729 | ||
2730 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
2731 | if (ret < 0) | |
2732 | goto out_err; | |
2733 | rbd_dev->image_format = 1; | |
2734 | ||
2735 | dout("discovered version 1 image, header name is %s\n", | |
2736 | rbd_dev->header_name); | |
2737 | ||
2738 | return 0; | |
2739 | ||
2740 | out_err: | |
2741 | kfree(rbd_dev->header_name); | |
2742 | rbd_dev->header_name = NULL; | |
2743 | kfree(rbd_dev->image_id); | |
2744 | rbd_dev->image_id = NULL; | |
2745 | ||
2746 | return ret; | |
2747 | } | |
2748 | ||
2749 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
2750 | { | |
2751 | size_t size; | |
9d475de5 | 2752 | int ret; |
a30b71b9 AE |
2753 | |
2754 | /* | |
2755 | * Image id was filled in by the caller. Record the header | |
2756 | * object name for this rbd image. | |
2757 | */ | |
2758 | size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->image_id_len; | |
2759 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2760 | if (!rbd_dev->header_name) | |
2761 | return -ENOMEM; | |
2762 | sprintf(rbd_dev->header_name, "%s%s", | |
2763 | RBD_HEADER_PREFIX, rbd_dev->image_id); | |
9d475de5 AE |
2764 | |
2765 | /* Get the size and object order for the image */ | |
2766 | ||
2767 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
2768 | if (ret < 0) |
2769 | goto out_err; | |
2770 | ||
2771 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
2772 | ||
2773 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
2774 | if (ret < 0) |
2775 | goto out_err; | |
2776 | ||
2777 | /* Get the features for the image */ | |
2778 | ||
2779 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
2780 | if (ret < 0) |
2781 | goto out_err; | |
a30b71b9 AE |
2782 | rbd_dev->image_format = 2; |
2783 | ||
2784 | dout("discovered version 2 image, header name is %s\n", | |
2785 | rbd_dev->header_name); | |
2786 | ||
2787 | return -ENOTSUPP; | |
9d475de5 AE |
2788 | out_err: |
2789 | kfree(rbd_dev->header_name); | |
2790 | rbd_dev->header_name = NULL; | |
1e130199 AE |
2791 | kfree(rbd_dev->header.object_prefix); |
2792 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
2793 | |
2794 | return ret; | |
a30b71b9 AE |
2795 | } |
2796 | ||
2797 | /* | |
2798 | * Probe for the existence of the header object for the given rbd | |
2799 | * device. For format 2 images this includes determining the image | |
2800 | * id. | |
2801 | */ | |
2802 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
2803 | { | |
2804 | int ret; | |
2805 | ||
2806 | /* | |
2807 | * Get the id from the image id object. If it's not a | |
2808 | * format 2 image, we'll get ENOENT back, and we'll assume | |
2809 | * it's a format 1 image. | |
2810 | */ | |
2811 | ret = rbd_dev_image_id(rbd_dev); | |
2812 | if (ret) | |
2813 | ret = rbd_dev_v1_probe(rbd_dev); | |
2814 | else | |
2815 | ret = rbd_dev_v2_probe(rbd_dev); | |
2816 | if (ret) | |
2817 | dout("probe failed, returning %d\n", ret); | |
2818 | ||
2819 | return ret; | |
2820 | } | |
2821 | ||
59c2be1e YS |
2822 | static ssize_t rbd_add(struct bus_type *bus, |
2823 | const char *buf, | |
2824 | size_t count) | |
602adf40 | 2825 | { |
cb8627c7 AE |
2826 | char *options; |
2827 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2828 | const char *mon_addrs = NULL; |
2829 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2830 | struct ceph_osd_client *osdc; |
2831 | int rc = -ENOMEM; | |
3feeb894 | 2832 | char *snap_name; |
602adf40 YS |
2833 | |
2834 | if (!try_module_get(THIS_MODULE)) | |
2835 | return -ENODEV; | |
2836 | ||
60571c7d | 2837 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2838 | if (!options) |
85ae8926 | 2839 | goto err_out_mem; |
cb8627c7 AE |
2840 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2841 | if (!rbd_dev) | |
85ae8926 | 2842 | goto err_out_mem; |
602adf40 YS |
2843 | |
2844 | /* static rbd_device initialization */ | |
2845 | spin_lock_init(&rbd_dev->lock); | |
2846 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2847 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2848 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2849 | |
602adf40 | 2850 | /* parse add command */ |
3feeb894 AE |
2851 | snap_name = rbd_add_parse_args(rbd_dev, buf, |
2852 | &mon_addrs, &mon_addrs_size, options, count); | |
2853 | if (IS_ERR(snap_name)) { | |
2854 | rc = PTR_ERR(snap_name); | |
85ae8926 | 2855 | goto err_out_mem; |
3feeb894 | 2856 | } |
e124a82f | 2857 | |
f8c38929 AE |
2858 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
2859 | if (rc < 0) | |
85ae8926 | 2860 | goto err_out_args; |
602adf40 | 2861 | |
602adf40 | 2862 | /* pick the pool */ |
1dbb4399 | 2863 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2864 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2865 | if (rc < 0) | |
2866 | goto err_out_client; | |
9bb2f334 | 2867 | rbd_dev->pool_id = rc; |
602adf40 | 2868 | |
a30b71b9 AE |
2869 | rc = rbd_dev_probe(rbd_dev); |
2870 | if (rc < 0) | |
05fd6f6f | 2871 | goto err_out_client; |
a30b71b9 | 2872 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
05fd6f6f AE |
2873 | |
2874 | /* no need to lock here, as rbd_dev is not registered yet */ | |
2875 | rc = rbd_dev_snaps_update(rbd_dev); | |
2876 | if (rc) | |
2877 | goto err_out_header; | |
2878 | ||
2879 | rc = rbd_dev_set_mapping(rbd_dev, snap_name); | |
2880 | if (rc) | |
2881 | goto err_out_header; | |
2882 | ||
85ae8926 AE |
2883 | /* generate unique id: find highest unique id, add one */ |
2884 | rbd_dev_id_get(rbd_dev); | |
2885 | ||
2886 | /* Fill in the device name, now that we have its id. */ | |
2887 | BUILD_BUG_ON(DEV_NAME_LEN | |
2888 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
2889 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
2890 | ||
2891 | /* Get our block major device number. */ | |
2892 | ||
27cc2594 AE |
2893 | rc = register_blkdev(0, rbd_dev->name); |
2894 | if (rc < 0) | |
85ae8926 | 2895 | goto err_out_id; |
27cc2594 | 2896 | rbd_dev->major = rc; |
602adf40 | 2897 | |
0f308a31 AE |
2898 | /* Set up the blkdev mapping. */ |
2899 | ||
2900 | rc = rbd_init_disk(rbd_dev); | |
dfc5606d | 2901 | if (rc) |
766fc439 YS |
2902 | goto err_out_blkdev; |
2903 | ||
0f308a31 AE |
2904 | rc = rbd_bus_add_dev(rbd_dev); |
2905 | if (rc) | |
2906 | goto err_out_disk; | |
2907 | ||
32eec68d AE |
2908 | /* |
2909 | * At this point cleanup in the event of an error is the job | |
2910 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
32eec68d | 2911 | */ |
2ac4e75d | 2912 | |
4bb1f1ed | 2913 | down_write(&rbd_dev->header_rwsem); |
5ed16177 | 2914 | rc = rbd_dev_snaps_register(rbd_dev); |
4bb1f1ed | 2915 | up_write(&rbd_dev->header_rwsem); |
2ac4e75d AE |
2916 | if (rc) |
2917 | goto err_out_bus; | |
2918 | ||
3ee4001e AE |
2919 | rc = rbd_init_watch_dev(rbd_dev); |
2920 | if (rc) | |
2921 | goto err_out_bus; | |
2922 | ||
2ac4e75d AE |
2923 | /* Everything's ready. Announce the disk to the world. */ |
2924 | ||
2ac4e75d | 2925 | add_disk(rbd_dev->disk); |
3ee4001e | 2926 | |
2ac4e75d AE |
2927 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
2928 | (unsigned long long) rbd_dev->mapping.size); | |
2929 | ||
602adf40 YS |
2930 | return count; |
2931 | ||
766fc439 | 2932 | err_out_bus: |
766fc439 YS |
2933 | /* this will also clean up rest of rbd_dev stuff */ |
2934 | ||
2935 | rbd_bus_del_dev(rbd_dev); | |
2936 | kfree(options); | |
766fc439 YS |
2937 | return rc; |
2938 | ||
0f308a31 AE |
2939 | err_out_disk: |
2940 | rbd_free_disk(rbd_dev); | |
602adf40 YS |
2941 | err_out_blkdev: |
2942 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
85ae8926 AE |
2943 | err_out_id: |
2944 | rbd_dev_id_put(rbd_dev); | |
05fd6f6f AE |
2945 | err_out_header: |
2946 | rbd_header_free(&rbd_dev->header); | |
602adf40 | 2947 | err_out_client: |
3fcf2581 | 2948 | kfree(rbd_dev->header_name); |
602adf40 | 2949 | rbd_put_client(rbd_dev); |
589d30e0 | 2950 | kfree(rbd_dev->image_id); |
85ae8926 AE |
2951 | err_out_args: |
2952 | kfree(rbd_dev->mapping.snap_name); | |
2953 | kfree(rbd_dev->image_name); | |
2954 | kfree(rbd_dev->pool_name); | |
2955 | err_out_mem: | |
27cc2594 | 2956 | kfree(rbd_dev); |
cb8627c7 | 2957 | kfree(options); |
27cc2594 | 2958 | |
602adf40 YS |
2959 | dout("Error adding device %s\n", buf); |
2960 | module_put(THIS_MODULE); | |
27cc2594 AE |
2961 | |
2962 | return (ssize_t) rc; | |
602adf40 YS |
2963 | } |
2964 | ||
de71a297 | 2965 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2966 | { |
2967 | struct list_head *tmp; | |
2968 | struct rbd_device *rbd_dev; | |
2969 | ||
e124a82f | 2970 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2971 | list_for_each(tmp, &rbd_dev_list) { |
2972 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2973 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2974 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2975 | return rbd_dev; |
e124a82f | 2976 | } |
602adf40 | 2977 | } |
e124a82f | 2978 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2979 | return NULL; |
2980 | } | |
2981 | ||
dfc5606d | 2982 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2983 | { |
593a9e7b | 2984 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2985 | |
1dbb4399 AE |
2986 | if (rbd_dev->watch_request) { |
2987 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2988 | ||
2989 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2990 | rbd_dev->watch_request); |
1dbb4399 | 2991 | } |
59c2be1e | 2992 | if (rbd_dev->watch_event) |
070c633f | 2993 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2994 | |
602adf40 YS |
2995 | rbd_put_client(rbd_dev); |
2996 | ||
2997 | /* clean up and free blkdev */ | |
2998 | rbd_free_disk(rbd_dev); | |
2999 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 3000 | |
2ac4e75d AE |
3001 | /* release allocated disk header fields */ |
3002 | rbd_header_free(&rbd_dev->header); | |
3003 | ||
32eec68d | 3004 | /* done with the id, and with the rbd_dev */ |
f84344f3 | 3005 | kfree(rbd_dev->mapping.snap_name); |
589d30e0 | 3006 | kfree(rbd_dev->image_id); |
0bed54dc | 3007 | kfree(rbd_dev->header_name); |
d22f76e7 | 3008 | kfree(rbd_dev->pool_name); |
0bed54dc | 3009 | kfree(rbd_dev->image_name); |
e2839308 | 3010 | rbd_dev_id_put(rbd_dev); |
602adf40 YS |
3011 | kfree(rbd_dev); |
3012 | ||
3013 | /* release module ref */ | |
3014 | module_put(THIS_MODULE); | |
602adf40 YS |
3015 | } |
3016 | ||
dfc5606d YS |
3017 | static ssize_t rbd_remove(struct bus_type *bus, |
3018 | const char *buf, | |
3019 | size_t count) | |
602adf40 YS |
3020 | { |
3021 | struct rbd_device *rbd_dev = NULL; | |
3022 | int target_id, rc; | |
3023 | unsigned long ul; | |
3024 | int ret = count; | |
3025 | ||
3026 | rc = strict_strtoul(buf, 10, &ul); | |
3027 | if (rc) | |
3028 | return rc; | |
3029 | ||
3030 | /* convert to int; abort if we lost anything in the conversion */ | |
3031 | target_id = (int) ul; | |
3032 | if (target_id != ul) | |
3033 | return -EINVAL; | |
3034 | ||
3035 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3036 | ||
3037 | rbd_dev = __rbd_get_dev(target_id); | |
3038 | if (!rbd_dev) { | |
3039 | ret = -ENOENT; | |
3040 | goto done; | |
3041 | } | |
3042 | ||
dfc5606d YS |
3043 | __rbd_remove_all_snaps(rbd_dev); |
3044 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
3045 | |
3046 | done: | |
3047 | mutex_unlock(&ctl_mutex); | |
aafb230e | 3048 | |
602adf40 YS |
3049 | return ret; |
3050 | } | |
3051 | ||
602adf40 YS |
3052 | /* |
3053 | * create control files in sysfs | |
dfc5606d | 3054 | * /sys/bus/rbd/... |
602adf40 YS |
3055 | */ |
3056 | static int rbd_sysfs_init(void) | |
3057 | { | |
dfc5606d | 3058 | int ret; |
602adf40 | 3059 | |
fed4c143 | 3060 | ret = device_register(&rbd_root_dev); |
21079786 | 3061 | if (ret < 0) |
dfc5606d | 3062 | return ret; |
602adf40 | 3063 | |
fed4c143 AE |
3064 | ret = bus_register(&rbd_bus_type); |
3065 | if (ret < 0) | |
3066 | device_unregister(&rbd_root_dev); | |
602adf40 | 3067 | |
602adf40 YS |
3068 | return ret; |
3069 | } | |
3070 | ||
3071 | static void rbd_sysfs_cleanup(void) | |
3072 | { | |
dfc5606d | 3073 | bus_unregister(&rbd_bus_type); |
fed4c143 | 3074 | device_unregister(&rbd_root_dev); |
602adf40 YS |
3075 | } |
3076 | ||
3077 | int __init rbd_init(void) | |
3078 | { | |
3079 | int rc; | |
3080 | ||
3081 | rc = rbd_sysfs_init(); | |
3082 | if (rc) | |
3083 | return rc; | |
f0f8cef5 | 3084 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
3085 | return 0; |
3086 | } | |
3087 | ||
3088 | void __exit rbd_exit(void) | |
3089 | { | |
3090 | rbd_sysfs_cleanup(); | |
3091 | } | |
3092 | ||
3093 | module_init(rbd_init); | |
3094 | module_exit(rbd_exit); | |
3095 | ||
3096 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
3097 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
3098 | MODULE_DESCRIPTION("rados block device"); | |
3099 | ||
3100 | /* following authorship retained from original osdblk.c */ | |
3101 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
3102 | ||
3103 | MODULE_LICENSE("GPL"); |