Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
df111be6 AE |
55 | /* It might be useful to have this defined elsewhere too */ |
56 | ||
57 | #define U64_MAX ((u64) (~0ULL)) | |
58 | ||
f0f8cef5 AE |
59 | #define RBD_DRV_NAME "rbd" |
60 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
61 | |
62 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
63 | ||
602adf40 | 64 | #define RBD_MAX_SNAP_NAME_LEN 32 |
35d489f9 | 65 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
66 | #define RBD_MAX_OPT_LEN 1024 |
67 | ||
68 | #define RBD_SNAP_HEAD_NAME "-" | |
69 | ||
1e130199 AE |
70 | #define RBD_IMAGE_ID_LEN_MAX 64 |
71 | #define RBD_OBJ_PREFIX_LEN_MAX 64 | |
589d30e0 | 72 | |
d889140c AE |
73 | /* Feature bits */ |
74 | ||
75 | #define RBD_FEATURE_LAYERING 1 | |
76 | ||
77 | /* Features supported by this (client software) implementation. */ | |
78 | ||
79 | #define RBD_FEATURES_ALL (0) | |
80 | ||
81a89793 AE |
81 | /* |
82 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
83 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
84 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
85 | * enough to hold all possible device names. | |
86 | */ | |
602adf40 | 87 | #define DEV_NAME_LEN 32 |
81a89793 | 88 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 89 | |
cc0538b6 | 90 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 91 | |
602adf40 YS |
92 | /* |
93 | * block device image metadata (in-memory version) | |
94 | */ | |
95 | struct rbd_image_header { | |
f84344f3 | 96 | /* These four fields never change for a given rbd image */ |
849b4260 | 97 | char *object_prefix; |
34b13184 | 98 | u64 features; |
602adf40 YS |
99 | __u8 obj_order; |
100 | __u8 crypt_type; | |
101 | __u8 comp_type; | |
602adf40 | 102 | |
f84344f3 AE |
103 | /* The remaining fields need to be updated occasionally */ |
104 | u64 image_size; | |
105 | struct ceph_snap_context *snapc; | |
602adf40 YS |
106 | char *snap_names; |
107 | u64 *snap_sizes; | |
59c2be1e YS |
108 | |
109 | u64 obj_version; | |
110 | }; | |
111 | ||
112 | struct rbd_options { | |
cc0538b6 | 113 | bool read_only; |
602adf40 YS |
114 | }; |
115 | ||
116 | /* | |
f0f8cef5 | 117 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
118 | */ |
119 | struct rbd_client { | |
120 | struct ceph_client *client; | |
121 | struct kref kref; | |
122 | struct list_head node; | |
123 | }; | |
124 | ||
125 | /* | |
f0f8cef5 | 126 | * a request completion status |
602adf40 | 127 | */ |
1fec7093 YS |
128 | struct rbd_req_status { |
129 | int done; | |
130 | int rc; | |
131 | u64 bytes; | |
132 | }; | |
133 | ||
134 | /* | |
135 | * a collection of requests | |
136 | */ | |
137 | struct rbd_req_coll { | |
138 | int total; | |
139 | int num_done; | |
140 | struct kref kref; | |
141 | struct rbd_req_status status[0]; | |
602adf40 YS |
142 | }; |
143 | ||
f0f8cef5 AE |
144 | /* |
145 | * a single io request | |
146 | */ | |
147 | struct rbd_request { | |
148 | struct request *rq; /* blk layer request */ | |
149 | struct bio *bio; /* cloned bio */ | |
150 | struct page **pages; /* list of used pages */ | |
151 | u64 len; | |
152 | int coll_index; | |
153 | struct rbd_req_coll *coll; | |
154 | }; | |
155 | ||
dfc5606d YS |
156 | struct rbd_snap { |
157 | struct device dev; | |
158 | const char *name; | |
3591538f | 159 | u64 size; |
dfc5606d YS |
160 | struct list_head node; |
161 | u64 id; | |
34b13184 | 162 | u64 features; |
dfc5606d YS |
163 | }; |
164 | ||
f84344f3 AE |
165 | struct rbd_mapping { |
166 | char *snap_name; | |
167 | u64 snap_id; | |
99c1f08f | 168 | u64 size; |
34b13184 | 169 | u64 features; |
f84344f3 AE |
170 | bool snap_exists; |
171 | bool read_only; | |
172 | }; | |
173 | ||
602adf40 YS |
174 | /* |
175 | * a single device | |
176 | */ | |
177 | struct rbd_device { | |
de71a297 | 178 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
179 | |
180 | int major; /* blkdev assigned major */ | |
181 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 182 | |
a30b71b9 | 183 | u32 image_format; /* Either 1 or 2 */ |
f8c38929 | 184 | struct rbd_options rbd_opts; |
602adf40 YS |
185 | struct rbd_client *rbd_client; |
186 | ||
187 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
188 | ||
189 | spinlock_t lock; /* queue lock */ | |
190 | ||
191 | struct rbd_image_header header; | |
589d30e0 AE |
192 | char *image_id; |
193 | size_t image_id_len; | |
0bed54dc AE |
194 | char *image_name; |
195 | size_t image_name_len; | |
196 | char *header_name; | |
d22f76e7 | 197 | char *pool_name; |
9bb2f334 | 198 | int pool_id; |
602adf40 | 199 | |
59c2be1e YS |
200 | struct ceph_osd_event *watch_event; |
201 | struct ceph_osd_request *watch_request; | |
202 | ||
c666601a JD |
203 | /* protects updating the header */ |
204 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
205 | |
206 | struct rbd_mapping mapping; | |
602adf40 YS |
207 | |
208 | struct list_head node; | |
dfc5606d YS |
209 | |
210 | /* list of snapshots */ | |
211 | struct list_head snaps; | |
212 | ||
213 | /* sysfs related */ | |
214 | struct device dev; | |
215 | }; | |
216 | ||
602adf40 | 217 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 218 | |
602adf40 | 219 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
220 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
221 | ||
432b8587 AE |
222 | static LIST_HEAD(rbd_client_list); /* clients */ |
223 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 224 | |
304f6808 AE |
225 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
226 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); | |
227 | ||
dfc5606d | 228 | static void rbd_dev_release(struct device *dev); |
14e7085d | 229 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 230 | |
f0f8cef5 AE |
231 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
232 | size_t count); | |
233 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
234 | size_t count); | |
235 | ||
236 | static struct bus_attribute rbd_bus_attrs[] = { | |
237 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
238 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
239 | __ATTR_NULL | |
240 | }; | |
241 | ||
242 | static struct bus_type rbd_bus_type = { | |
243 | .name = "rbd", | |
244 | .bus_attrs = rbd_bus_attrs, | |
245 | }; | |
246 | ||
247 | static void rbd_root_dev_release(struct device *dev) | |
248 | { | |
249 | } | |
250 | ||
251 | static struct device rbd_root_dev = { | |
252 | .init_name = "rbd", | |
253 | .release = rbd_root_dev_release, | |
254 | }; | |
255 | ||
aafb230e AE |
256 | #ifdef RBD_DEBUG |
257 | #define rbd_assert(expr) \ | |
258 | if (unlikely(!(expr))) { \ | |
259 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
260 | "at line %d:\n\n" \ | |
261 | "\trbd_assert(%s);\n\n", \ | |
262 | __func__, __LINE__, #expr); \ | |
263 | BUG(); \ | |
264 | } | |
265 | #else /* !RBD_DEBUG */ | |
266 | # define rbd_assert(expr) ((void) 0) | |
267 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 268 | |
dfc5606d YS |
269 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
270 | { | |
271 | return get_device(&rbd_dev->dev); | |
272 | } | |
273 | ||
274 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
275 | { | |
276 | put_device(&rbd_dev->dev); | |
277 | } | |
602adf40 | 278 | |
117973fb AE |
279 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
280 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); | |
59c2be1e | 281 | |
602adf40 YS |
282 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
283 | { | |
f0f8cef5 | 284 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 285 | |
f84344f3 | 286 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
287 | return -EROFS; |
288 | ||
340c7a2b | 289 | rbd_get_dev(rbd_dev); |
f84344f3 | 290 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
340c7a2b | 291 | |
602adf40 YS |
292 | return 0; |
293 | } | |
294 | ||
dfc5606d YS |
295 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
296 | { | |
297 | struct rbd_device *rbd_dev = disk->private_data; | |
298 | ||
299 | rbd_put_dev(rbd_dev); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
602adf40 YS |
304 | static const struct block_device_operations rbd_bd_ops = { |
305 | .owner = THIS_MODULE, | |
306 | .open = rbd_open, | |
dfc5606d | 307 | .release = rbd_release, |
602adf40 YS |
308 | }; |
309 | ||
310 | /* | |
311 | * Initialize an rbd client instance. | |
43ae4701 | 312 | * We own *ceph_opts. |
602adf40 | 313 | */ |
f8c38929 | 314 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
315 | { |
316 | struct rbd_client *rbdc; | |
317 | int ret = -ENOMEM; | |
318 | ||
319 | dout("rbd_client_create\n"); | |
320 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
321 | if (!rbdc) | |
322 | goto out_opt; | |
323 | ||
324 | kref_init(&rbdc->kref); | |
325 | INIT_LIST_HEAD(&rbdc->node); | |
326 | ||
bc534d86 AE |
327 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
328 | ||
43ae4701 | 329 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 330 | if (IS_ERR(rbdc->client)) |
bc534d86 | 331 | goto out_mutex; |
43ae4701 | 332 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
333 | |
334 | ret = ceph_open_session(rbdc->client); | |
335 | if (ret < 0) | |
336 | goto out_err; | |
337 | ||
432b8587 | 338 | spin_lock(&rbd_client_list_lock); |
602adf40 | 339 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 340 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 341 | |
bc534d86 AE |
342 | mutex_unlock(&ctl_mutex); |
343 | ||
602adf40 YS |
344 | dout("rbd_client_create created %p\n", rbdc); |
345 | return rbdc; | |
346 | ||
347 | out_err: | |
348 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
349 | out_mutex: |
350 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
351 | kfree(rbdc); |
352 | out_opt: | |
43ae4701 AE |
353 | if (ceph_opts) |
354 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 355 | return ERR_PTR(ret); |
602adf40 YS |
356 | } |
357 | ||
358 | /* | |
1f7ba331 AE |
359 | * Find a ceph client with specific addr and configuration. If |
360 | * found, bump its reference count. | |
602adf40 | 361 | */ |
1f7ba331 | 362 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
363 | { |
364 | struct rbd_client *client_node; | |
1f7ba331 | 365 | bool found = false; |
602adf40 | 366 | |
43ae4701 | 367 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
368 | return NULL; |
369 | ||
1f7ba331 AE |
370 | spin_lock(&rbd_client_list_lock); |
371 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
372 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
373 | kref_get(&client_node->kref); | |
374 | found = true; | |
375 | break; | |
376 | } | |
377 | } | |
378 | spin_unlock(&rbd_client_list_lock); | |
379 | ||
380 | return found ? client_node : NULL; | |
602adf40 YS |
381 | } |
382 | ||
59c2be1e YS |
383 | /* |
384 | * mount options | |
385 | */ | |
386 | enum { | |
59c2be1e YS |
387 | Opt_last_int, |
388 | /* int args above */ | |
389 | Opt_last_string, | |
390 | /* string args above */ | |
cc0538b6 AE |
391 | Opt_read_only, |
392 | Opt_read_write, | |
393 | /* Boolean args above */ | |
394 | Opt_last_bool, | |
59c2be1e YS |
395 | }; |
396 | ||
43ae4701 | 397 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
398 | /* int args above */ |
399 | /* string args above */ | |
f84344f3 | 400 | {Opt_read_only, "mapping.read_only"}, |
cc0538b6 AE |
401 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
402 | {Opt_read_write, "read_write"}, | |
403 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
404 | /* Boolean args above */ | |
59c2be1e YS |
405 | {-1, NULL} |
406 | }; | |
407 | ||
408 | static int parse_rbd_opts_token(char *c, void *private) | |
409 | { | |
43ae4701 | 410 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
411 | substring_t argstr[MAX_OPT_ARGS]; |
412 | int token, intval, ret; | |
413 | ||
43ae4701 | 414 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
415 | if (token < 0) |
416 | return -EINVAL; | |
417 | ||
418 | if (token < Opt_last_int) { | |
419 | ret = match_int(&argstr[0], &intval); | |
420 | if (ret < 0) { | |
421 | pr_err("bad mount option arg (not int) " | |
422 | "at '%s'\n", c); | |
423 | return ret; | |
424 | } | |
425 | dout("got int token %d val %d\n", token, intval); | |
426 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
427 | dout("got string token %d val %s\n", token, | |
428 | argstr[0].from); | |
cc0538b6 AE |
429 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
430 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
431 | } else { |
432 | dout("got token %d\n", token); | |
433 | } | |
434 | ||
435 | switch (token) { | |
cc0538b6 AE |
436 | case Opt_read_only: |
437 | rbd_opts->read_only = true; | |
438 | break; | |
439 | case Opt_read_write: | |
440 | rbd_opts->read_only = false; | |
441 | break; | |
59c2be1e | 442 | default: |
aafb230e AE |
443 | rbd_assert(false); |
444 | break; | |
59c2be1e YS |
445 | } |
446 | return 0; | |
447 | } | |
448 | ||
602adf40 YS |
449 | /* |
450 | * Get a ceph client with specific addr and configuration, if one does | |
451 | * not exist create it. | |
452 | */ | |
f8c38929 AE |
453 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
454 | size_t mon_addr_len, char *options) | |
602adf40 | 455 | { |
f8c38929 | 456 | struct rbd_options *rbd_opts = &rbd_dev->rbd_opts; |
43ae4701 | 457 | struct ceph_options *ceph_opts; |
f8c38929 | 458 | struct rbd_client *rbdc; |
59c2be1e | 459 | |
cc0538b6 | 460 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
602adf40 | 461 | |
43ae4701 AE |
462 | ceph_opts = ceph_parse_options(options, mon_addr, |
463 | mon_addr + mon_addr_len, | |
464 | parse_rbd_opts_token, rbd_opts); | |
f8c38929 AE |
465 | if (IS_ERR(ceph_opts)) |
466 | return PTR_ERR(ceph_opts); | |
602adf40 | 467 | |
1f7ba331 | 468 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 469 | if (rbdc) { |
602adf40 | 470 | /* using an existing client */ |
43ae4701 | 471 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
472 | } else { |
473 | rbdc = rbd_client_create(ceph_opts); | |
474 | if (IS_ERR(rbdc)) | |
475 | return PTR_ERR(rbdc); | |
602adf40 | 476 | } |
f8c38929 | 477 | rbd_dev->rbd_client = rbdc; |
602adf40 | 478 | |
f8c38929 | 479 | return 0; |
602adf40 YS |
480 | } |
481 | ||
482 | /* | |
483 | * Destroy ceph client | |
d23a4b3f | 484 | * |
432b8587 | 485 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
486 | */ |
487 | static void rbd_client_release(struct kref *kref) | |
488 | { | |
489 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
490 | ||
491 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 492 | spin_lock(&rbd_client_list_lock); |
602adf40 | 493 | list_del(&rbdc->node); |
cd9d9f5d | 494 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
495 | |
496 | ceph_destroy_client(rbdc->client); | |
497 | kfree(rbdc); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
502 | * it. | |
503 | */ | |
504 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
505 | { | |
506 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
507 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
508 | } |
509 | ||
1fec7093 YS |
510 | /* |
511 | * Destroy requests collection | |
512 | */ | |
513 | static void rbd_coll_release(struct kref *kref) | |
514 | { | |
515 | struct rbd_req_coll *coll = | |
516 | container_of(kref, struct rbd_req_coll, kref); | |
517 | ||
518 | dout("rbd_coll_release %p\n", coll); | |
519 | kfree(coll); | |
520 | } | |
602adf40 | 521 | |
a30b71b9 AE |
522 | static bool rbd_image_format_valid(u32 image_format) |
523 | { | |
524 | return image_format == 1 || image_format == 2; | |
525 | } | |
526 | ||
8e94af8e AE |
527 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
528 | { | |
103a150f AE |
529 | size_t size; |
530 | u32 snap_count; | |
531 | ||
532 | /* The header has to start with the magic rbd header text */ | |
533 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
534 | return false; | |
535 | ||
536 | /* | |
537 | * The size of a snapshot header has to fit in a size_t, and | |
538 | * that limits the number of snapshots. | |
539 | */ | |
540 | snap_count = le32_to_cpu(ondisk->snap_count); | |
541 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
542 | if (snap_count > size / sizeof (__le64)) | |
543 | return false; | |
544 | ||
545 | /* | |
546 | * Not only that, but the size of the entire the snapshot | |
547 | * header must also be representable in a size_t. | |
548 | */ | |
549 | size -= snap_count * sizeof (__le64); | |
550 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
551 | return false; | |
552 | ||
553 | return true; | |
8e94af8e AE |
554 | } |
555 | ||
602adf40 YS |
556 | /* |
557 | * Create a new header structure, translate header format from the on-disk | |
558 | * header. | |
559 | */ | |
560 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 561 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 562 | { |
ccece235 | 563 | u32 snap_count; |
58c17b0e | 564 | size_t len; |
d2bb24e5 | 565 | size_t size; |
621901d6 | 566 | u32 i; |
602adf40 | 567 | |
6a52325f AE |
568 | memset(header, 0, sizeof (*header)); |
569 | ||
103a150f AE |
570 | snap_count = le32_to_cpu(ondisk->snap_count); |
571 | ||
58c17b0e AE |
572 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
573 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 574 | if (!header->object_prefix) |
602adf40 | 575 | return -ENOMEM; |
58c17b0e AE |
576 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
577 | header->object_prefix[len] = '\0'; | |
00f1f36f | 578 | |
602adf40 | 579 | if (snap_count) { |
f785cc1d AE |
580 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
581 | ||
621901d6 AE |
582 | /* Save a copy of the snapshot names */ |
583 | ||
f785cc1d AE |
584 | if (snap_names_len > (u64) SIZE_MAX) |
585 | return -EIO; | |
586 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 587 | if (!header->snap_names) |
6a52325f | 588 | goto out_err; |
f785cc1d AE |
589 | /* |
590 | * Note that rbd_dev_v1_header_read() guarantees | |
591 | * the ondisk buffer we're working with has | |
592 | * snap_names_len bytes beyond the end of the | |
593 | * snapshot id array, this memcpy() is safe. | |
594 | */ | |
595 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
596 | snap_names_len); | |
6a52325f | 597 | |
621901d6 AE |
598 | /* Record each snapshot's size */ |
599 | ||
d2bb24e5 AE |
600 | size = snap_count * sizeof (*header->snap_sizes); |
601 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 602 | if (!header->snap_sizes) |
6a52325f | 603 | goto out_err; |
621901d6 AE |
604 | for (i = 0; i < snap_count; i++) |
605 | header->snap_sizes[i] = | |
606 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 607 | } else { |
ccece235 | 608 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
609 | header->snap_names = NULL; |
610 | header->snap_sizes = NULL; | |
611 | } | |
849b4260 | 612 | |
34b13184 | 613 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
614 | header->obj_order = ondisk->options.order; |
615 | header->crypt_type = ondisk->options.crypt_type; | |
616 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 617 | |
621901d6 AE |
618 | /* Allocate and fill in the snapshot context */ |
619 | ||
f84344f3 | 620 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
621 | size = sizeof (struct ceph_snap_context); |
622 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
623 | header->snapc = kzalloc(size, GFP_KERNEL); | |
624 | if (!header->snapc) | |
625 | goto out_err; | |
602adf40 YS |
626 | |
627 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 628 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 629 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
630 | for (i = 0; i < snap_count; i++) |
631 | header->snapc->snaps[i] = | |
632 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
633 | |
634 | return 0; | |
635 | ||
6a52325f | 636 | out_err: |
849b4260 | 637 | kfree(header->snap_sizes); |
ccece235 | 638 | header->snap_sizes = NULL; |
602adf40 | 639 | kfree(header->snap_names); |
ccece235 | 640 | header->snap_names = NULL; |
6a52325f AE |
641 | kfree(header->object_prefix); |
642 | header->object_prefix = NULL; | |
ccece235 | 643 | |
00f1f36f | 644 | return -ENOMEM; |
602adf40 YS |
645 | } |
646 | ||
8836b995 | 647 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 648 | { |
602adf40 | 649 | |
e86924a8 | 650 | struct rbd_snap *snap; |
602adf40 | 651 | |
e86924a8 AE |
652 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
653 | if (!strcmp(snap_name, snap->name)) { | |
654 | rbd_dev->mapping.snap_id = snap->id; | |
655 | rbd_dev->mapping.size = snap->size; | |
34b13184 | 656 | rbd_dev->mapping.features = snap->features; |
602adf40 | 657 | |
e86924a8 | 658 | return 0; |
00f1f36f | 659 | } |
00f1f36f | 660 | } |
e86924a8 | 661 | |
00f1f36f | 662 | return -ENOENT; |
602adf40 YS |
663 | } |
664 | ||
5ed16177 | 665 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev, char *snap_name) |
602adf40 | 666 | { |
78dc447d | 667 | int ret; |
602adf40 | 668 | |
4e1105a2 | 669 | if (!memcmp(snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 670 | sizeof (RBD_SNAP_HEAD_NAME))) { |
f84344f3 | 671 | rbd_dev->mapping.snap_id = CEPH_NOSNAP; |
99c1f08f | 672 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 673 | rbd_dev->mapping.features = rbd_dev->header.features; |
f84344f3 AE |
674 | rbd_dev->mapping.snap_exists = false; |
675 | rbd_dev->mapping.read_only = rbd_dev->rbd_opts.read_only; | |
e86924a8 | 676 | ret = 0; |
602adf40 | 677 | } else { |
8836b995 | 678 | ret = snap_by_name(rbd_dev, snap_name); |
602adf40 YS |
679 | if (ret < 0) |
680 | goto done; | |
f84344f3 AE |
681 | rbd_dev->mapping.snap_exists = true; |
682 | rbd_dev->mapping.read_only = true; | |
602adf40 | 683 | } |
4e1105a2 | 684 | rbd_dev->mapping.snap_name = snap_name; |
602adf40 | 685 | done: |
602adf40 YS |
686 | return ret; |
687 | } | |
688 | ||
689 | static void rbd_header_free(struct rbd_image_header *header) | |
690 | { | |
849b4260 | 691 | kfree(header->object_prefix); |
d78fd7ae | 692 | header->object_prefix = NULL; |
602adf40 | 693 | kfree(header->snap_sizes); |
d78fd7ae | 694 | header->snap_sizes = NULL; |
849b4260 | 695 | kfree(header->snap_names); |
d78fd7ae | 696 | header->snap_names = NULL; |
d1d25646 | 697 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 698 | header->snapc = NULL; |
602adf40 YS |
699 | } |
700 | ||
65ccfe21 | 701 | static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 702 | { |
65ccfe21 AE |
703 | char *name; |
704 | u64 segment; | |
705 | int ret; | |
602adf40 | 706 | |
65ccfe21 AE |
707 | name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
708 | if (!name) | |
709 | return NULL; | |
710 | segment = offset >> rbd_dev->header.obj_order; | |
711 | ret = snprintf(name, RBD_MAX_SEG_NAME_LEN, "%s.%012llx", | |
712 | rbd_dev->header.object_prefix, segment); | |
713 | if (ret < 0 || ret >= RBD_MAX_SEG_NAME_LEN) { | |
714 | pr_err("error formatting segment name for #%llu (%d)\n", | |
715 | segment, ret); | |
716 | kfree(name); | |
717 | name = NULL; | |
718 | } | |
602adf40 | 719 | |
65ccfe21 AE |
720 | return name; |
721 | } | |
602adf40 | 722 | |
65ccfe21 AE |
723 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
724 | { | |
725 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 726 | |
65ccfe21 AE |
727 | return offset & (segment_size - 1); |
728 | } | |
729 | ||
730 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
731 | u64 offset, u64 length) | |
732 | { | |
733 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
734 | ||
735 | offset &= segment_size - 1; | |
736 | ||
aafb230e | 737 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
738 | if (offset + length > segment_size) |
739 | length = segment_size - offset; | |
740 | ||
741 | return length; | |
602adf40 YS |
742 | } |
743 | ||
1fec7093 YS |
744 | static int rbd_get_num_segments(struct rbd_image_header *header, |
745 | u64 ofs, u64 len) | |
746 | { | |
df111be6 AE |
747 | u64 start_seg; |
748 | u64 end_seg; | |
749 | ||
750 | if (!len) | |
751 | return 0; | |
752 | if (len - 1 > U64_MAX - ofs) | |
753 | return -ERANGE; | |
754 | ||
755 | start_seg = ofs >> header->obj_order; | |
756 | end_seg = (ofs + len - 1) >> header->obj_order; | |
757 | ||
1fec7093 YS |
758 | return end_seg - start_seg + 1; |
759 | } | |
760 | ||
029bcbd8 JD |
761 | /* |
762 | * returns the size of an object in the image | |
763 | */ | |
764 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
765 | { | |
766 | return 1 << header->obj_order; | |
767 | } | |
768 | ||
602adf40 YS |
769 | /* |
770 | * bio helpers | |
771 | */ | |
772 | ||
773 | static void bio_chain_put(struct bio *chain) | |
774 | { | |
775 | struct bio *tmp; | |
776 | ||
777 | while (chain) { | |
778 | tmp = chain; | |
779 | chain = chain->bi_next; | |
780 | bio_put(tmp); | |
781 | } | |
782 | } | |
783 | ||
784 | /* | |
785 | * zeros a bio chain, starting at specific offset | |
786 | */ | |
787 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
788 | { | |
789 | struct bio_vec *bv; | |
790 | unsigned long flags; | |
791 | void *buf; | |
792 | int i; | |
793 | int pos = 0; | |
794 | ||
795 | while (chain) { | |
796 | bio_for_each_segment(bv, chain, i) { | |
797 | if (pos + bv->bv_len > start_ofs) { | |
798 | int remainder = max(start_ofs - pos, 0); | |
799 | buf = bvec_kmap_irq(bv, &flags); | |
800 | memset(buf + remainder, 0, | |
801 | bv->bv_len - remainder); | |
85b5aaa6 | 802 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
803 | } |
804 | pos += bv->bv_len; | |
805 | } | |
806 | ||
807 | chain = chain->bi_next; | |
808 | } | |
809 | } | |
810 | ||
811 | /* | |
812 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
813 | * might return a bio_pair that will need to be released. | |
814 | */ | |
815 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
816 | struct bio_pair **bp, | |
817 | int len, gfp_t gfpmask) | |
818 | { | |
542582fc AE |
819 | struct bio *old_chain = *old; |
820 | struct bio *new_chain = NULL; | |
821 | struct bio *tail; | |
602adf40 YS |
822 | int total = 0; |
823 | ||
824 | if (*bp) { | |
825 | bio_pair_release(*bp); | |
826 | *bp = NULL; | |
827 | } | |
828 | ||
829 | while (old_chain && (total < len)) { | |
542582fc AE |
830 | struct bio *tmp; |
831 | ||
602adf40 YS |
832 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
833 | if (!tmp) | |
834 | goto err_out; | |
542582fc | 835 | gfpmask &= ~__GFP_WAIT; /* can't wait after the first */ |
602adf40 YS |
836 | |
837 | if (total + old_chain->bi_size > len) { | |
838 | struct bio_pair *bp; | |
839 | ||
840 | /* | |
841 | * this split can only happen with a single paged bio, | |
842 | * split_bio will BUG_ON if this is not the case | |
843 | */ | |
844 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
845 | "bi_size=%u\n", |
846 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
847 | |
848 | /* split the bio. We'll release it either in the next | |
849 | call, or it will have to be released outside */ | |
593a9e7b | 850 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
851 | if (!bp) |
852 | goto err_out; | |
853 | ||
854 | __bio_clone(tmp, &bp->bio1); | |
855 | ||
856 | *next = &bp->bio2; | |
857 | } else { | |
858 | __bio_clone(tmp, old_chain); | |
859 | *next = old_chain->bi_next; | |
860 | } | |
861 | ||
862 | tmp->bi_bdev = NULL; | |
602adf40 | 863 | tmp->bi_next = NULL; |
542582fc | 864 | if (new_chain) |
602adf40 | 865 | tail->bi_next = tmp; |
542582fc AE |
866 | else |
867 | new_chain = tmp; | |
868 | tail = tmp; | |
602adf40 YS |
869 | old_chain = old_chain->bi_next; |
870 | ||
871 | total += tmp->bi_size; | |
872 | } | |
873 | ||
aafb230e | 874 | rbd_assert(total == len); |
602adf40 | 875 | |
602adf40 YS |
876 | *old = old_chain; |
877 | ||
878 | return new_chain; | |
879 | ||
880 | err_out: | |
881 | dout("bio_chain_clone with err\n"); | |
882 | bio_chain_put(new_chain); | |
883 | return NULL; | |
884 | } | |
885 | ||
886 | /* | |
887 | * helpers for osd request op vectors. | |
888 | */ | |
57cfc106 AE |
889 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
890 | int opcode, u32 payload_len) | |
602adf40 | 891 | { |
57cfc106 AE |
892 | struct ceph_osd_req_op *ops; |
893 | ||
894 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
895 | if (!ops) | |
896 | return NULL; | |
897 | ||
898 | ops[0].op = opcode; | |
899 | ||
602adf40 YS |
900 | /* |
901 | * op extent offset and length will be set later on | |
902 | * in calc_raw_layout() | |
903 | */ | |
57cfc106 AE |
904 | ops[0].payload_len = payload_len; |
905 | ||
906 | return ops; | |
602adf40 YS |
907 | } |
908 | ||
909 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
910 | { | |
911 | kfree(ops); | |
912 | } | |
913 | ||
1fec7093 YS |
914 | static void rbd_coll_end_req_index(struct request *rq, |
915 | struct rbd_req_coll *coll, | |
916 | int index, | |
917 | int ret, u64 len) | |
918 | { | |
919 | struct request_queue *q; | |
920 | int min, max, i; | |
921 | ||
bd919d45 AE |
922 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
923 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
924 | |
925 | if (!rq) | |
926 | return; | |
927 | ||
928 | if (!coll) { | |
929 | blk_end_request(rq, ret, len); | |
930 | return; | |
931 | } | |
932 | ||
933 | q = rq->q; | |
934 | ||
935 | spin_lock_irq(q->queue_lock); | |
936 | coll->status[index].done = 1; | |
937 | coll->status[index].rc = ret; | |
938 | coll->status[index].bytes = len; | |
939 | max = min = coll->num_done; | |
940 | while (max < coll->total && coll->status[max].done) | |
941 | max++; | |
942 | ||
943 | for (i = min; i<max; i++) { | |
944 | __blk_end_request(rq, coll->status[i].rc, | |
945 | coll->status[i].bytes); | |
946 | coll->num_done++; | |
947 | kref_put(&coll->kref, rbd_coll_release); | |
948 | } | |
949 | spin_unlock_irq(q->queue_lock); | |
950 | } | |
951 | ||
952 | static void rbd_coll_end_req(struct rbd_request *req, | |
953 | int ret, u64 len) | |
954 | { | |
955 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
956 | } | |
957 | ||
602adf40 YS |
958 | /* |
959 | * Send ceph osd request | |
960 | */ | |
961 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 962 | struct rbd_device *rbd_dev, |
602adf40 YS |
963 | struct ceph_snap_context *snapc, |
964 | u64 snapid, | |
aded07ea | 965 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
966 | struct bio *bio, |
967 | struct page **pages, | |
968 | int num_pages, | |
969 | int flags, | |
970 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
971 | struct rbd_req_coll *coll, |
972 | int coll_index, | |
602adf40 | 973 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
974 | struct ceph_msg *msg), |
975 | struct ceph_osd_request **linger_req, | |
976 | u64 *ver) | |
602adf40 YS |
977 | { |
978 | struct ceph_osd_request *req; | |
979 | struct ceph_file_layout *layout; | |
980 | int ret; | |
981 | u64 bno; | |
982 | struct timespec mtime = CURRENT_TIME; | |
983 | struct rbd_request *req_data; | |
984 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 985 | struct ceph_osd_client *osdc; |
602adf40 | 986 | |
602adf40 | 987 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
988 | if (!req_data) { |
989 | if (coll) | |
990 | rbd_coll_end_req_index(rq, coll, coll_index, | |
991 | -ENOMEM, len); | |
992 | return -ENOMEM; | |
993 | } | |
994 | ||
995 | if (coll) { | |
996 | req_data->coll = coll; | |
997 | req_data->coll_index = coll_index; | |
998 | } | |
602adf40 | 999 | |
bd919d45 AE |
1000 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
1001 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 1002 | |
0ce1a794 | 1003 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
1004 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
1005 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 1006 | if (!req) { |
4ad12621 | 1007 | ret = -ENOMEM; |
602adf40 YS |
1008 | goto done_pages; |
1009 | } | |
1010 | ||
1011 | req->r_callback = rbd_cb; | |
1012 | ||
1013 | req_data->rq = rq; | |
1014 | req_data->bio = bio; | |
1015 | req_data->pages = pages; | |
1016 | req_data->len = len; | |
1017 | ||
1018 | req->r_priv = req_data; | |
1019 | ||
1020 | reqhead = req->r_request->front.iov_base; | |
1021 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
1022 | ||
aded07ea | 1023 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
1024 | req->r_oid_len = strlen(req->r_oid); |
1025 | ||
1026 | layout = &req->r_file_layout; | |
1027 | memset(layout, 0, sizeof(*layout)); | |
1028 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
1029 | layout->fl_stripe_count = cpu_to_le32(1); | |
1030 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 1031 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
6cae3717 SW |
1032 | ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
1033 | req, ops); | |
1034 | rbd_assert(ret == 0); | |
602adf40 YS |
1035 | |
1036 | ceph_osdc_build_request(req, ofs, &len, | |
1037 | ops, | |
1038 | snapc, | |
1039 | &mtime, | |
1040 | req->r_oid, req->r_oid_len); | |
602adf40 | 1041 | |
59c2be1e | 1042 | if (linger_req) { |
1dbb4399 | 1043 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
1044 | *linger_req = req; |
1045 | } | |
1046 | ||
1dbb4399 | 1047 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
1048 | if (ret < 0) |
1049 | goto done_err; | |
1050 | ||
1051 | if (!rbd_cb) { | |
1dbb4399 | 1052 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1053 | if (ver) |
1054 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1055 | dout("reassert_ver=%llu\n", |
1056 | (unsigned long long) | |
1057 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1058 | ceph_osdc_put_request(req); |
1059 | } | |
1060 | return ret; | |
1061 | ||
1062 | done_err: | |
1063 | bio_chain_put(req_data->bio); | |
1064 | ceph_osdc_put_request(req); | |
1065 | done_pages: | |
1fec7093 | 1066 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1067 | kfree(req_data); |
602adf40 YS |
1068 | return ret; |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Ceph osd op callback | |
1073 | */ | |
1074 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1075 | { | |
1076 | struct rbd_request *req_data = req->r_priv; | |
1077 | struct ceph_osd_reply_head *replyhead; | |
1078 | struct ceph_osd_op *op; | |
1079 | __s32 rc; | |
1080 | u64 bytes; | |
1081 | int read_op; | |
1082 | ||
1083 | /* parse reply */ | |
1084 | replyhead = msg->front.iov_base; | |
1085 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1086 | op = (void *)(replyhead + 1); | |
1087 | rc = le32_to_cpu(replyhead->result); | |
1088 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1089 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1090 | |
bd919d45 AE |
1091 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1092 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1093 | |
1094 | if (rc == -ENOENT && read_op) { | |
1095 | zero_bio_chain(req_data->bio, 0); | |
1096 | rc = 0; | |
1097 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1098 | zero_bio_chain(req_data->bio, bytes); | |
1099 | bytes = req_data->len; | |
1100 | } | |
1101 | ||
1fec7093 | 1102 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1103 | |
1104 | if (req_data->bio) | |
1105 | bio_chain_put(req_data->bio); | |
1106 | ||
1107 | ceph_osdc_put_request(req); | |
1108 | kfree(req_data); | |
1109 | } | |
1110 | ||
59c2be1e YS |
1111 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1112 | { | |
1113 | ceph_osdc_put_request(req); | |
1114 | } | |
1115 | ||
602adf40 YS |
1116 | /* |
1117 | * Do a synchronous ceph osd operation | |
1118 | */ | |
0ce1a794 | 1119 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1120 | struct ceph_snap_context *snapc, |
1121 | u64 snapid, | |
602adf40 | 1122 | int flags, |
913d2fdc | 1123 | struct ceph_osd_req_op *ops, |
aded07ea | 1124 | const char *object_name, |
f8d4de6e AE |
1125 | u64 ofs, u64 inbound_size, |
1126 | char *inbound, | |
59c2be1e YS |
1127 | struct ceph_osd_request **linger_req, |
1128 | u64 *ver) | |
602adf40 YS |
1129 | { |
1130 | int ret; | |
1131 | struct page **pages; | |
1132 | int num_pages; | |
913d2fdc | 1133 | |
aafb230e | 1134 | rbd_assert(ops != NULL); |
602adf40 | 1135 | |
f8d4de6e | 1136 | num_pages = calc_pages_for(ofs, inbound_size); |
602adf40 | 1137 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
b8d0638a DC |
1138 | if (IS_ERR(pages)) |
1139 | return PTR_ERR(pages); | |
602adf40 | 1140 | |
0ce1a794 | 1141 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
f8d4de6e | 1142 | object_name, ofs, inbound_size, NULL, |
602adf40 YS |
1143 | pages, num_pages, |
1144 | flags, | |
1145 | ops, | |
1fec7093 | 1146 | NULL, 0, |
59c2be1e YS |
1147 | NULL, |
1148 | linger_req, ver); | |
602adf40 | 1149 | if (ret < 0) |
913d2fdc | 1150 | goto done; |
602adf40 | 1151 | |
f8d4de6e AE |
1152 | if ((flags & CEPH_OSD_FLAG_READ) && inbound) |
1153 | ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret); | |
602adf40 | 1154 | |
602adf40 YS |
1155 | done: |
1156 | ceph_release_page_vector(pages, num_pages); | |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Do an asynchronous ceph osd operation | |
1162 | */ | |
1163 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1164 | struct rbd_device *rbd_dev, |
602adf40 YS |
1165 | struct ceph_snap_context *snapc, |
1166 | u64 snapid, | |
d1f57ea6 | 1167 | int opcode, int flags, |
602adf40 | 1168 | u64 ofs, u64 len, |
1fec7093 YS |
1169 | struct bio *bio, |
1170 | struct rbd_req_coll *coll, | |
1171 | int coll_index) | |
602adf40 YS |
1172 | { |
1173 | char *seg_name; | |
1174 | u64 seg_ofs; | |
1175 | u64 seg_len; | |
1176 | int ret; | |
1177 | struct ceph_osd_req_op *ops; | |
1178 | u32 payload_len; | |
1179 | ||
65ccfe21 | 1180 | seg_name = rbd_segment_name(rbd_dev, ofs); |
602adf40 YS |
1181 | if (!seg_name) |
1182 | return -ENOMEM; | |
65ccfe21 AE |
1183 | seg_len = rbd_segment_length(rbd_dev, ofs, len); |
1184 | seg_ofs = rbd_segment_offset(rbd_dev, ofs); | |
602adf40 YS |
1185 | |
1186 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1187 | ||
57cfc106 AE |
1188 | ret = -ENOMEM; |
1189 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1190 | if (!ops) | |
602adf40 YS |
1191 | goto done; |
1192 | ||
1193 | /* we've taken care of segment sizes earlier when we | |
1194 | cloned the bios. We should never have a segment | |
1195 | truncated at this point */ | |
aafb230e | 1196 | rbd_assert(seg_len == len); |
602adf40 YS |
1197 | |
1198 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1199 | seg_name, seg_ofs, seg_len, | |
1200 | bio, | |
1201 | NULL, 0, | |
1202 | flags, | |
1203 | ops, | |
1fec7093 | 1204 | coll, coll_index, |
59c2be1e | 1205 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1206 | |
1207 | rbd_destroy_ops(ops); | |
602adf40 YS |
1208 | done: |
1209 | kfree(seg_name); | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * Request async osd write | |
1215 | */ | |
1216 | static int rbd_req_write(struct request *rq, | |
1217 | struct rbd_device *rbd_dev, | |
1218 | struct ceph_snap_context *snapc, | |
1219 | u64 ofs, u64 len, | |
1fec7093 YS |
1220 | struct bio *bio, |
1221 | struct rbd_req_coll *coll, | |
1222 | int coll_index) | |
602adf40 YS |
1223 | { |
1224 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1225 | CEPH_OSD_OP_WRITE, | |
1226 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1227 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1228 | } |
1229 | ||
1230 | /* | |
1231 | * Request async osd read | |
1232 | */ | |
1233 | static int rbd_req_read(struct request *rq, | |
1234 | struct rbd_device *rbd_dev, | |
1235 | u64 snapid, | |
1236 | u64 ofs, u64 len, | |
1fec7093 YS |
1237 | struct bio *bio, |
1238 | struct rbd_req_coll *coll, | |
1239 | int coll_index) | |
602adf40 YS |
1240 | { |
1241 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1242 | snapid, |
602adf40 YS |
1243 | CEPH_OSD_OP_READ, |
1244 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1245 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1246 | } |
1247 | ||
1248 | /* | |
1249 | * Request sync osd read | |
1250 | */ | |
0ce1a794 | 1251 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1252 | u64 snapid, |
aded07ea | 1253 | const char *object_name, |
602adf40 | 1254 | u64 ofs, u64 len, |
59c2be1e YS |
1255 | char *buf, |
1256 | u64 *ver) | |
602adf40 | 1257 | { |
913d2fdc AE |
1258 | struct ceph_osd_req_op *ops; |
1259 | int ret; | |
1260 | ||
1261 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1262 | if (!ops) | |
1263 | return -ENOMEM; | |
1264 | ||
1265 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1266 | snapid, |
602adf40 | 1267 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1268 | ops, object_name, ofs, len, buf, NULL, ver); |
1269 | rbd_destroy_ops(ops); | |
1270 | ||
1271 | return ret; | |
602adf40 YS |
1272 | } |
1273 | ||
1274 | /* | |
59c2be1e YS |
1275 | * Request sync osd watch |
1276 | */ | |
0ce1a794 | 1277 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1278 | u64 ver, |
7f0a24d8 | 1279 | u64 notify_id) |
59c2be1e YS |
1280 | { |
1281 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1282 | int ret; |
1283 | ||
57cfc106 AE |
1284 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1285 | if (!ops) | |
1286 | return -ENOMEM; | |
59c2be1e | 1287 | |
a71b891b | 1288 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1289 | ops[0].watch.cookie = notify_id; |
1290 | ops[0].watch.flag = 0; | |
1291 | ||
0ce1a794 | 1292 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1293 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1294 | NULL, 0, |
59c2be1e YS |
1295 | CEPH_OSD_FLAG_READ, |
1296 | ops, | |
1fec7093 | 1297 | NULL, 0, |
59c2be1e YS |
1298 | rbd_simple_req_cb, 0, NULL); |
1299 | ||
1300 | rbd_destroy_ops(ops); | |
1301 | return ret; | |
1302 | } | |
1303 | ||
1304 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1305 | { | |
0ce1a794 | 1306 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1307 | u64 hver; |
13143d2d SW |
1308 | int rc; |
1309 | ||
0ce1a794 | 1310 | if (!rbd_dev) |
59c2be1e YS |
1311 | return; |
1312 | ||
bd919d45 AE |
1313 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1314 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1315 | (unsigned int) opcode); | |
117973fb | 1316 | rc = rbd_dev_refresh(rbd_dev, &hver); |
13143d2d | 1317 | if (rc) |
f0f8cef5 | 1318 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1319 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1320 | |
7f0a24d8 | 1321 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1322 | } |
1323 | ||
1324 | /* | |
1325 | * Request sync osd watch | |
1326 | */ | |
0e6f322d | 1327 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1328 | { |
1329 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1330 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1331 | int ret; |
59c2be1e | 1332 | |
57cfc106 AE |
1333 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1334 | if (!ops) | |
1335 | return -ENOMEM; | |
59c2be1e YS |
1336 | |
1337 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1338 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1339 | if (ret < 0) |
1340 | goto fail; | |
1341 | ||
0e6f322d | 1342 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1343 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1344 | ops[0].watch.flag = 1; |
1345 | ||
0ce1a794 | 1346 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1347 | CEPH_NOSNAP, |
59c2be1e YS |
1348 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1349 | ops, | |
0e6f322d AE |
1350 | rbd_dev->header_name, |
1351 | 0, 0, NULL, | |
0ce1a794 | 1352 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1353 | |
1354 | if (ret < 0) | |
1355 | goto fail_event; | |
1356 | ||
1357 | rbd_destroy_ops(ops); | |
1358 | return 0; | |
1359 | ||
1360 | fail_event: | |
0ce1a794 AE |
1361 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1362 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1363 | fail: |
1364 | rbd_destroy_ops(ops); | |
1365 | return ret; | |
1366 | } | |
1367 | ||
79e3057c YS |
1368 | /* |
1369 | * Request sync osd unwatch | |
1370 | */ | |
070c633f | 1371 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1372 | { |
1373 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1374 | int ret; |
79e3057c | 1375 | |
57cfc106 AE |
1376 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1377 | if (!ops) | |
1378 | return -ENOMEM; | |
79e3057c YS |
1379 | |
1380 | ops[0].watch.ver = 0; | |
0ce1a794 | 1381 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1382 | ops[0].watch.flag = 0; |
1383 | ||
0ce1a794 | 1384 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1385 | CEPH_NOSNAP, |
79e3057c YS |
1386 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1387 | ops, | |
070c633f AE |
1388 | rbd_dev->header_name, |
1389 | 0, 0, NULL, NULL, NULL); | |
1390 | ||
79e3057c YS |
1391 | |
1392 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1393 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1394 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1395 | return ret; |
1396 | } | |
1397 | ||
602adf40 | 1398 | /* |
3cb4a687 | 1399 | * Synchronous osd object method call |
602adf40 | 1400 | */ |
0ce1a794 | 1401 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1402 | const char *object_name, |
1403 | const char *class_name, | |
1404 | const char *method_name, | |
3cb4a687 AE |
1405 | const char *outbound, |
1406 | size_t outbound_size, | |
f8d4de6e AE |
1407 | char *inbound, |
1408 | size_t inbound_size, | |
3cb4a687 | 1409 | int flags, |
59c2be1e | 1410 | u64 *ver) |
602adf40 YS |
1411 | { |
1412 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1413 | int class_name_len = strlen(class_name); |
1414 | int method_name_len = strlen(method_name); | |
3cb4a687 | 1415 | int payload_size; |
57cfc106 AE |
1416 | int ret; |
1417 | ||
3cb4a687 AE |
1418 | /* |
1419 | * Any input parameters required by the method we're calling | |
1420 | * will be sent along with the class and method names as | |
1421 | * part of the message payload. That data and its size are | |
1422 | * supplied via the indata and indata_len fields (named from | |
1423 | * the perspective of the server side) in the OSD request | |
1424 | * operation. | |
1425 | */ | |
1426 | payload_size = class_name_len + method_name_len + outbound_size; | |
1427 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size); | |
57cfc106 AE |
1428 | if (!ops) |
1429 | return -ENOMEM; | |
602adf40 | 1430 | |
aded07ea AE |
1431 | ops[0].cls.class_name = class_name; |
1432 | ops[0].cls.class_len = (__u8) class_name_len; | |
1433 | ops[0].cls.method_name = method_name; | |
1434 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 | 1435 | ops[0].cls.argc = 0; |
3cb4a687 AE |
1436 | ops[0].cls.indata = outbound; |
1437 | ops[0].cls.indata_len = outbound_size; | |
602adf40 | 1438 | |
0ce1a794 | 1439 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1440 | CEPH_NOSNAP, |
3cb4a687 | 1441 | flags, ops, |
f8d4de6e AE |
1442 | object_name, 0, inbound_size, inbound, |
1443 | NULL, ver); | |
602adf40 YS |
1444 | |
1445 | rbd_destroy_ops(ops); | |
1446 | ||
1447 | dout("cls_exec returned %d\n", ret); | |
1448 | return ret; | |
1449 | } | |
1450 | ||
1fec7093 YS |
1451 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1452 | { | |
1453 | struct rbd_req_coll *coll = | |
1454 | kzalloc(sizeof(struct rbd_req_coll) + | |
1455 | sizeof(struct rbd_req_status) * num_reqs, | |
1456 | GFP_ATOMIC); | |
1457 | ||
1458 | if (!coll) | |
1459 | return NULL; | |
1460 | coll->total = num_reqs; | |
1461 | kref_init(&coll->kref); | |
1462 | return coll; | |
1463 | } | |
1464 | ||
602adf40 YS |
1465 | /* |
1466 | * block device queue callback | |
1467 | */ | |
1468 | static void rbd_rq_fn(struct request_queue *q) | |
1469 | { | |
1470 | struct rbd_device *rbd_dev = q->queuedata; | |
1471 | struct request *rq; | |
1472 | struct bio_pair *bp = NULL; | |
1473 | ||
00f1f36f | 1474 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1475 | struct bio *bio; |
1476 | struct bio *rq_bio, *next_bio = NULL; | |
1477 | bool do_write; | |
bd919d45 AE |
1478 | unsigned int size; |
1479 | u64 op_size = 0; | |
602adf40 | 1480 | u64 ofs; |
1fec7093 YS |
1481 | int num_segs, cur_seg = 0; |
1482 | struct rbd_req_coll *coll; | |
d1d25646 | 1483 | struct ceph_snap_context *snapc; |
602adf40 | 1484 | |
602adf40 YS |
1485 | dout("fetched request\n"); |
1486 | ||
1487 | /* filter out block requests we don't understand */ | |
1488 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1489 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1490 | continue; |
602adf40 YS |
1491 | } |
1492 | ||
1493 | /* deduce our operation (read, write) */ | |
1494 | do_write = (rq_data_dir(rq) == WRITE); | |
1495 | ||
1496 | size = blk_rq_bytes(rq); | |
593a9e7b | 1497 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 | 1498 | rq_bio = rq->bio; |
f84344f3 | 1499 | if (do_write && rbd_dev->mapping.read_only) { |
602adf40 | 1500 | __blk_end_request_all(rq, -EROFS); |
00f1f36f | 1501 | continue; |
602adf40 YS |
1502 | } |
1503 | ||
1504 | spin_unlock_irq(q->queue_lock); | |
1505 | ||
d1d25646 | 1506 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1507 | |
f84344f3 AE |
1508 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP && |
1509 | !rbd_dev->mapping.snap_exists) { | |
e88a36ec | 1510 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1511 | dout("request for non-existent snapshot"); |
1512 | spin_lock_irq(q->queue_lock); | |
1513 | __blk_end_request_all(rq, -ENXIO); | |
1514 | continue; | |
e88a36ec JD |
1515 | } |
1516 | ||
d1d25646 JD |
1517 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1518 | ||
1519 | up_read(&rbd_dev->header_rwsem); | |
1520 | ||
602adf40 YS |
1521 | dout("%s 0x%x bytes at 0x%llx\n", |
1522 | do_write ? "write" : "read", | |
bd919d45 | 1523 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1524 | |
1fec7093 | 1525 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
df111be6 AE |
1526 | if (num_segs <= 0) { |
1527 | spin_lock_irq(q->queue_lock); | |
1528 | __blk_end_request_all(rq, num_segs); | |
1529 | ceph_put_snap_context(snapc); | |
1530 | continue; | |
1531 | } | |
1fec7093 YS |
1532 | coll = rbd_alloc_coll(num_segs); |
1533 | if (!coll) { | |
1534 | spin_lock_irq(q->queue_lock); | |
1535 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1536 | ceph_put_snap_context(snapc); |
00f1f36f | 1537 | continue; |
1fec7093 YS |
1538 | } |
1539 | ||
602adf40 YS |
1540 | do { |
1541 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1542 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
65ccfe21 | 1543 | op_size = rbd_segment_length(rbd_dev, ofs, size); |
1fec7093 | 1544 | kref_get(&coll->kref); |
602adf40 YS |
1545 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1546 | op_size, GFP_ATOMIC); | |
1547 | if (!bio) { | |
1fec7093 YS |
1548 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1549 | -ENOMEM, op_size); | |
1550 | goto next_seg; | |
602adf40 YS |
1551 | } |
1552 | ||
1fec7093 | 1553 | |
602adf40 YS |
1554 | /* init OSD command: write or read */ |
1555 | if (do_write) | |
1556 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1557 | snapc, |
602adf40 | 1558 | ofs, |
1fec7093 YS |
1559 | op_size, bio, |
1560 | coll, cur_seg); | |
602adf40 YS |
1561 | else |
1562 | rbd_req_read(rq, rbd_dev, | |
f84344f3 | 1563 | rbd_dev->mapping.snap_id, |
602adf40 | 1564 | ofs, |
1fec7093 YS |
1565 | op_size, bio, |
1566 | coll, cur_seg); | |
602adf40 | 1567 | |
1fec7093 | 1568 | next_seg: |
602adf40 YS |
1569 | size -= op_size; |
1570 | ofs += op_size; | |
1571 | ||
1fec7093 | 1572 | cur_seg++; |
602adf40 YS |
1573 | rq_bio = next_bio; |
1574 | } while (size > 0); | |
1fec7093 | 1575 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1576 | |
1577 | if (bp) | |
1578 | bio_pair_release(bp); | |
602adf40 | 1579 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1580 | |
1581 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1582 | } |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1587 | * multiple osd objects. One exception would be with a single page bios, | |
1588 | * which we handle later at bio_chain_clone | |
1589 | */ | |
1590 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1591 | struct bio_vec *bvec) | |
1592 | { | |
1593 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1594 | unsigned int chunk_sectors; |
1595 | sector_t sector; | |
1596 | unsigned int bio_sectors; | |
602adf40 YS |
1597 | int max; |
1598 | ||
593a9e7b AE |
1599 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1600 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1601 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1602 | ||
602adf40 | 1603 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1604 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1605 | if (max < 0) |
1606 | max = 0; /* bio_add cannot handle a negative return */ | |
1607 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1608 | return bvec->bv_len; | |
1609 | return max; | |
1610 | } | |
1611 | ||
1612 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1613 | { | |
1614 | struct gendisk *disk = rbd_dev->disk; | |
1615 | ||
1616 | if (!disk) | |
1617 | return; | |
1618 | ||
602adf40 YS |
1619 | if (disk->flags & GENHD_FL_UP) |
1620 | del_gendisk(disk); | |
1621 | if (disk->queue) | |
1622 | blk_cleanup_queue(disk->queue); | |
1623 | put_disk(disk); | |
1624 | } | |
1625 | ||
1626 | /* | |
4156d998 AE |
1627 | * Read the complete header for the given rbd device. |
1628 | * | |
1629 | * Returns a pointer to a dynamically-allocated buffer containing | |
1630 | * the complete and validated header. Caller can pass the address | |
1631 | * of a variable that will be filled in with the version of the | |
1632 | * header object at the time it was read. | |
1633 | * | |
1634 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1635 | */ |
4156d998 AE |
1636 | static struct rbd_image_header_ondisk * |
1637 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1638 | { |
4156d998 | 1639 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1640 | u32 snap_count = 0; |
4156d998 AE |
1641 | u64 names_size = 0; |
1642 | u32 want_count; | |
1643 | int ret; | |
602adf40 | 1644 | |
00f1f36f | 1645 | /* |
4156d998 AE |
1646 | * The complete header will include an array of its 64-bit |
1647 | * snapshot ids, followed by the names of those snapshots as | |
1648 | * a contiguous block of NUL-terminated strings. Note that | |
1649 | * the number of snapshots could change by the time we read | |
1650 | * it in, in which case we re-read it. | |
00f1f36f | 1651 | */ |
4156d998 AE |
1652 | do { |
1653 | size_t size; | |
1654 | ||
1655 | kfree(ondisk); | |
1656 | ||
1657 | size = sizeof (*ondisk); | |
1658 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1659 | size += names_size; | |
1660 | ondisk = kmalloc(size, GFP_KERNEL); | |
1661 | if (!ondisk) | |
1662 | return ERR_PTR(-ENOMEM); | |
1663 | ||
1664 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1665 | rbd_dev->header_name, |
4156d998 AE |
1666 | 0, size, |
1667 | (char *) ondisk, version); | |
1668 | ||
1669 | if (ret < 0) | |
1670 | goto out_err; | |
1671 | if (WARN_ON((size_t) ret < size)) { | |
1672 | ret = -ENXIO; | |
1673 | pr_warning("short header read for image %s" | |
1674 | " (want %zd got %d)\n", | |
1675 | rbd_dev->image_name, size, ret); | |
1676 | goto out_err; | |
1677 | } | |
1678 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1679 | ret = -ENXIO; | |
1680 | pr_warning("invalid header for image %s\n", | |
1681 | rbd_dev->image_name); | |
1682 | goto out_err; | |
81e759fb | 1683 | } |
602adf40 | 1684 | |
4156d998 AE |
1685 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1686 | want_count = snap_count; | |
1687 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1688 | } while (snap_count != want_count); | |
00f1f36f | 1689 | |
4156d998 | 1690 | return ondisk; |
00f1f36f | 1691 | |
4156d998 AE |
1692 | out_err: |
1693 | kfree(ondisk); | |
1694 | ||
1695 | return ERR_PTR(ret); | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * reload the ondisk the header | |
1700 | */ | |
1701 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1702 | struct rbd_image_header *header) | |
1703 | { | |
1704 | struct rbd_image_header_ondisk *ondisk; | |
1705 | u64 ver = 0; | |
1706 | int ret; | |
602adf40 | 1707 | |
4156d998 AE |
1708 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1709 | if (IS_ERR(ondisk)) | |
1710 | return PTR_ERR(ondisk); | |
1711 | ret = rbd_header_from_disk(header, ondisk); | |
1712 | if (ret >= 0) | |
1713 | header->obj_version = ver; | |
1714 | kfree(ondisk); | |
1715 | ||
1716 | return ret; | |
602adf40 YS |
1717 | } |
1718 | ||
dfc5606d YS |
1719 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1720 | { | |
1721 | struct rbd_snap *snap; | |
a0593290 | 1722 | struct rbd_snap *next; |
dfc5606d | 1723 | |
a0593290 | 1724 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1725 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1726 | } |
1727 | ||
9478554a AE |
1728 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
1729 | { | |
1730 | sector_t size; | |
1731 | ||
1732 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP) | |
1733 | return; | |
1734 | ||
1735 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
1736 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1737 | rbd_dev->mapping.size = (u64) size; | |
1738 | set_capacity(rbd_dev->disk, size); | |
1739 | } | |
1740 | ||
602adf40 YS |
1741 | /* |
1742 | * only read the first part of the ondisk header, without the snaps info | |
1743 | */ | |
117973fb | 1744 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1745 | { |
1746 | int ret; | |
1747 | struct rbd_image_header h; | |
602adf40 YS |
1748 | |
1749 | ret = rbd_read_header(rbd_dev, &h); | |
1750 | if (ret < 0) | |
1751 | return ret; | |
1752 | ||
a51aa0c0 JD |
1753 | down_write(&rbd_dev->header_rwsem); |
1754 | ||
9478554a AE |
1755 | /* Update image size, and check for resize of mapped image */ |
1756 | rbd_dev->header.image_size = h.image_size; | |
1757 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 1758 | |
849b4260 | 1759 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1760 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1761 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1762 | /* osd requests may still refer to snapc */ |
1763 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1764 | |
b813623a AE |
1765 | if (hver) |
1766 | *hver = h.obj_version; | |
a71b891b | 1767 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1768 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1769 | rbd_dev->header.snapc = h.snapc; |
1770 | rbd_dev->header.snap_names = h.snap_names; | |
1771 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1772 | /* Free the extra copy of the object prefix */ |
1773 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1774 | kfree(h.object_prefix); | |
1775 | ||
304f6808 AE |
1776 | ret = rbd_dev_snaps_update(rbd_dev); |
1777 | if (!ret) | |
1778 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 1779 | |
c666601a | 1780 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1781 | |
dfc5606d | 1782 | return ret; |
602adf40 YS |
1783 | } |
1784 | ||
117973fb | 1785 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
1fe5e993 AE |
1786 | { |
1787 | int ret; | |
1788 | ||
117973fb | 1789 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1fe5e993 | 1790 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb AE |
1791 | if (rbd_dev->image_format == 1) |
1792 | ret = rbd_dev_v1_refresh(rbd_dev, hver); | |
1793 | else | |
1794 | ret = rbd_dev_v2_refresh(rbd_dev, hver); | |
1fe5e993 AE |
1795 | mutex_unlock(&ctl_mutex); |
1796 | ||
1797 | return ret; | |
1798 | } | |
1799 | ||
602adf40 YS |
1800 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1801 | { | |
1802 | struct gendisk *disk; | |
1803 | struct request_queue *q; | |
593a9e7b | 1804 | u64 segment_size; |
602adf40 | 1805 | |
602adf40 | 1806 | /* create gendisk info */ |
602adf40 YS |
1807 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
1808 | if (!disk) | |
1fcdb8aa | 1809 | return -ENOMEM; |
602adf40 | 1810 | |
f0f8cef5 | 1811 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1812 | rbd_dev->dev_id); |
602adf40 YS |
1813 | disk->major = rbd_dev->major; |
1814 | disk->first_minor = 0; | |
1815 | disk->fops = &rbd_bd_ops; | |
1816 | disk->private_data = rbd_dev; | |
1817 | ||
1818 | /* init rq */ | |
602adf40 YS |
1819 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); |
1820 | if (!q) | |
1821 | goto out_disk; | |
029bcbd8 | 1822 | |
593a9e7b AE |
1823 | /* We use the default size, but let's be explicit about it. */ |
1824 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1825 | ||
029bcbd8 | 1826 | /* set io sizes to object size */ |
593a9e7b AE |
1827 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1828 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1829 | blk_queue_max_segment_size(q, segment_size); | |
1830 | blk_queue_io_min(q, segment_size); | |
1831 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1832 | |
602adf40 YS |
1833 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1834 | disk->queue = q; | |
1835 | ||
1836 | q->queuedata = rbd_dev; | |
1837 | ||
1838 | rbd_dev->disk = disk; | |
602adf40 | 1839 | |
12f02944 AE |
1840 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
1841 | ||
602adf40 | 1842 | return 0; |
602adf40 YS |
1843 | out_disk: |
1844 | put_disk(disk); | |
1fcdb8aa AE |
1845 | |
1846 | return -ENOMEM; | |
602adf40 YS |
1847 | } |
1848 | ||
dfc5606d YS |
1849 | /* |
1850 | sysfs | |
1851 | */ | |
1852 | ||
593a9e7b AE |
1853 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1854 | { | |
1855 | return container_of(dev, struct rbd_device, dev); | |
1856 | } | |
1857 | ||
dfc5606d YS |
1858 | static ssize_t rbd_size_show(struct device *dev, |
1859 | struct device_attribute *attr, char *buf) | |
1860 | { | |
593a9e7b | 1861 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1862 | sector_t size; |
1863 | ||
1864 | down_read(&rbd_dev->header_rwsem); | |
1865 | size = get_capacity(rbd_dev->disk); | |
1866 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1867 | |
a51aa0c0 | 1868 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1869 | } |
1870 | ||
34b13184 AE |
1871 | /* |
1872 | * Note this shows the features for whatever's mapped, which is not | |
1873 | * necessarily the base image. | |
1874 | */ | |
1875 | static ssize_t rbd_features_show(struct device *dev, | |
1876 | struct device_attribute *attr, char *buf) | |
1877 | { | |
1878 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1879 | ||
1880 | return sprintf(buf, "0x%016llx\n", | |
1881 | (unsigned long long) rbd_dev->mapping.features); | |
1882 | } | |
1883 | ||
dfc5606d YS |
1884 | static ssize_t rbd_major_show(struct device *dev, |
1885 | struct device_attribute *attr, char *buf) | |
1886 | { | |
593a9e7b | 1887 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1888 | |
dfc5606d YS |
1889 | return sprintf(buf, "%d\n", rbd_dev->major); |
1890 | } | |
1891 | ||
1892 | static ssize_t rbd_client_id_show(struct device *dev, | |
1893 | struct device_attribute *attr, char *buf) | |
602adf40 | 1894 | { |
593a9e7b | 1895 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1896 | |
1dbb4399 AE |
1897 | return sprintf(buf, "client%lld\n", |
1898 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1899 | } |
1900 | ||
dfc5606d YS |
1901 | static ssize_t rbd_pool_show(struct device *dev, |
1902 | struct device_attribute *attr, char *buf) | |
602adf40 | 1903 | { |
593a9e7b | 1904 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1905 | |
1906 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1907 | } | |
1908 | ||
9bb2f334 AE |
1909 | static ssize_t rbd_pool_id_show(struct device *dev, |
1910 | struct device_attribute *attr, char *buf) | |
1911 | { | |
1912 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1913 | ||
1914 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1915 | } | |
1916 | ||
dfc5606d YS |
1917 | static ssize_t rbd_name_show(struct device *dev, |
1918 | struct device_attribute *attr, char *buf) | |
1919 | { | |
593a9e7b | 1920 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1921 | |
0bed54dc | 1922 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1923 | } |
1924 | ||
589d30e0 AE |
1925 | static ssize_t rbd_image_id_show(struct device *dev, |
1926 | struct device_attribute *attr, char *buf) | |
1927 | { | |
1928 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1929 | ||
1930 | return sprintf(buf, "%s\n", rbd_dev->image_id); | |
1931 | } | |
1932 | ||
34b13184 AE |
1933 | /* |
1934 | * Shows the name of the currently-mapped snapshot (or | |
1935 | * RBD_SNAP_HEAD_NAME for the base image). | |
1936 | */ | |
dfc5606d YS |
1937 | static ssize_t rbd_snap_show(struct device *dev, |
1938 | struct device_attribute *attr, | |
1939 | char *buf) | |
1940 | { | |
593a9e7b | 1941 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1942 | |
f84344f3 | 1943 | return sprintf(buf, "%s\n", rbd_dev->mapping.snap_name); |
dfc5606d YS |
1944 | } |
1945 | ||
1946 | static ssize_t rbd_image_refresh(struct device *dev, | |
1947 | struct device_attribute *attr, | |
1948 | const char *buf, | |
1949 | size_t size) | |
1950 | { | |
593a9e7b | 1951 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1952 | int ret; |
602adf40 | 1953 | |
117973fb | 1954 | ret = rbd_dev_refresh(rbd_dev, NULL); |
b813623a AE |
1955 | |
1956 | return ret < 0 ? ret : size; | |
dfc5606d | 1957 | } |
602adf40 | 1958 | |
dfc5606d | 1959 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 1960 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
1961 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
1962 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1963 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1964 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 1965 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 1966 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
1967 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
1968 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
dfc5606d YS |
1969 | |
1970 | static struct attribute *rbd_attrs[] = { | |
1971 | &dev_attr_size.attr, | |
34b13184 | 1972 | &dev_attr_features.attr, |
dfc5606d YS |
1973 | &dev_attr_major.attr, |
1974 | &dev_attr_client_id.attr, | |
1975 | &dev_attr_pool.attr, | |
9bb2f334 | 1976 | &dev_attr_pool_id.attr, |
dfc5606d | 1977 | &dev_attr_name.attr, |
589d30e0 | 1978 | &dev_attr_image_id.attr, |
dfc5606d YS |
1979 | &dev_attr_current_snap.attr, |
1980 | &dev_attr_refresh.attr, | |
dfc5606d YS |
1981 | NULL |
1982 | }; | |
1983 | ||
1984 | static struct attribute_group rbd_attr_group = { | |
1985 | .attrs = rbd_attrs, | |
1986 | }; | |
1987 | ||
1988 | static const struct attribute_group *rbd_attr_groups[] = { | |
1989 | &rbd_attr_group, | |
1990 | NULL | |
1991 | }; | |
1992 | ||
1993 | static void rbd_sysfs_dev_release(struct device *dev) | |
1994 | { | |
1995 | } | |
1996 | ||
1997 | static struct device_type rbd_device_type = { | |
1998 | .name = "rbd", | |
1999 | .groups = rbd_attr_groups, | |
2000 | .release = rbd_sysfs_dev_release, | |
2001 | }; | |
2002 | ||
2003 | ||
2004 | /* | |
2005 | sysfs - snapshots | |
2006 | */ | |
2007 | ||
2008 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2009 | struct device_attribute *attr, | |
2010 | char *buf) | |
2011 | { | |
2012 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2013 | ||
3591538f | 2014 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2015 | } |
2016 | ||
2017 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2018 | struct device_attribute *attr, | |
2019 | char *buf) | |
2020 | { | |
2021 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2022 | ||
3591538f | 2023 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2024 | } |
2025 | ||
34b13184 AE |
2026 | static ssize_t rbd_snap_features_show(struct device *dev, |
2027 | struct device_attribute *attr, | |
2028 | char *buf) | |
2029 | { | |
2030 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2031 | ||
2032 | return sprintf(buf, "0x%016llx\n", | |
2033 | (unsigned long long) snap->features); | |
2034 | } | |
2035 | ||
dfc5606d YS |
2036 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2037 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 2038 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
2039 | |
2040 | static struct attribute *rbd_snap_attrs[] = { | |
2041 | &dev_attr_snap_size.attr, | |
2042 | &dev_attr_snap_id.attr, | |
34b13184 | 2043 | &dev_attr_snap_features.attr, |
dfc5606d YS |
2044 | NULL, |
2045 | }; | |
2046 | ||
2047 | static struct attribute_group rbd_snap_attr_group = { | |
2048 | .attrs = rbd_snap_attrs, | |
2049 | }; | |
2050 | ||
2051 | static void rbd_snap_dev_release(struct device *dev) | |
2052 | { | |
2053 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2054 | kfree(snap->name); | |
2055 | kfree(snap); | |
2056 | } | |
2057 | ||
2058 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2059 | &rbd_snap_attr_group, | |
2060 | NULL | |
2061 | }; | |
2062 | ||
2063 | static struct device_type rbd_snap_device_type = { | |
2064 | .groups = rbd_snap_attr_groups, | |
2065 | .release = rbd_snap_dev_release, | |
2066 | }; | |
2067 | ||
304f6808 AE |
2068 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2069 | { | |
2070 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
2071 | bool reg = device_is_registered(&snap->dev); | |
2072 | ||
2073 | rbd_assert(!ret ^ reg); | |
2074 | ||
2075 | return ret; | |
2076 | } | |
2077 | ||
14e7085d | 2078 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2079 | { |
2080 | list_del(&snap->node); | |
304f6808 AE |
2081 | if (device_is_registered(&snap->dev)) |
2082 | device_unregister(&snap->dev); | |
dfc5606d YS |
2083 | } |
2084 | ||
14e7085d | 2085 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2086 | struct device *parent) |
2087 | { | |
2088 | struct device *dev = &snap->dev; | |
2089 | int ret; | |
2090 | ||
2091 | dev->type = &rbd_snap_device_type; | |
2092 | dev->parent = parent; | |
2093 | dev->release = rbd_snap_dev_release; | |
2094 | dev_set_name(dev, "snap_%s", snap->name); | |
304f6808 AE |
2095 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2096 | ||
dfc5606d YS |
2097 | ret = device_register(dev); |
2098 | ||
2099 | return ret; | |
2100 | } | |
2101 | ||
4e891e0a | 2102 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 2103 | const char *snap_name, |
34b13184 AE |
2104 | u64 snap_id, u64 snap_size, |
2105 | u64 snap_features) | |
dfc5606d | 2106 | { |
4e891e0a | 2107 | struct rbd_snap *snap; |
dfc5606d | 2108 | int ret; |
4e891e0a AE |
2109 | |
2110 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2111 | if (!snap) |
4e891e0a AE |
2112 | return ERR_PTR(-ENOMEM); |
2113 | ||
2114 | ret = -ENOMEM; | |
c8d18425 | 2115 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
2116 | if (!snap->name) |
2117 | goto err; | |
2118 | ||
c8d18425 AE |
2119 | snap->id = snap_id; |
2120 | snap->size = snap_size; | |
34b13184 | 2121 | snap->features = snap_features; |
4e891e0a AE |
2122 | |
2123 | return snap; | |
2124 | ||
dfc5606d YS |
2125 | err: |
2126 | kfree(snap->name); | |
2127 | kfree(snap); | |
4e891e0a AE |
2128 | |
2129 | return ERR_PTR(ret); | |
dfc5606d YS |
2130 | } |
2131 | ||
cd892126 AE |
2132 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2133 | u64 *snap_size, u64 *snap_features) | |
2134 | { | |
2135 | char *snap_name; | |
2136 | ||
2137 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
2138 | ||
2139 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
2140 | *snap_features = 0; /* No features for v1 */ | |
2141 | ||
2142 | /* Skip over names until we find the one we are looking for */ | |
2143 | ||
2144 | snap_name = rbd_dev->header.snap_names; | |
2145 | while (which--) | |
2146 | snap_name += strlen(snap_name) + 1; | |
2147 | ||
2148 | return snap_name; | |
2149 | } | |
2150 | ||
9d475de5 AE |
2151 | /* |
2152 | * Get the size and object order for an image snapshot, or if | |
2153 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
2154 | * image. | |
2155 | */ | |
2156 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
2157 | u8 *order, u64 *snap_size) | |
2158 | { | |
2159 | __le64 snapid = cpu_to_le64(snap_id); | |
2160 | int ret; | |
2161 | struct { | |
2162 | u8 order; | |
2163 | __le64 size; | |
2164 | } __attribute__ ((packed)) size_buf = { 0 }; | |
2165 | ||
2166 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2167 | "rbd", "get_size", | |
2168 | (char *) &snapid, sizeof (snapid), | |
2169 | (char *) &size_buf, sizeof (size_buf), | |
2170 | CEPH_OSD_FLAG_READ, NULL); | |
2171 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2172 | if (ret < 0) | |
2173 | return ret; | |
2174 | ||
2175 | *order = size_buf.order; | |
2176 | *snap_size = le64_to_cpu(size_buf.size); | |
2177 | ||
2178 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
2179 | (unsigned long long) snap_id, (unsigned int) *order, | |
2180 | (unsigned long long) *snap_size); | |
2181 | ||
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
2186 | { | |
2187 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
2188 | &rbd_dev->header.obj_order, | |
2189 | &rbd_dev->header.image_size); | |
2190 | } | |
2191 | ||
1e130199 AE |
2192 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2193 | { | |
2194 | void *reply_buf; | |
2195 | int ret; | |
2196 | void *p; | |
2197 | ||
2198 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
2199 | if (!reply_buf) | |
2200 | return -ENOMEM; | |
2201 | ||
2202 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2203 | "rbd", "get_object_prefix", | |
2204 | NULL, 0, | |
2205 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, | |
2206 | CEPH_OSD_FLAG_READ, NULL); | |
2207 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2208 | if (ret < 0) | |
2209 | goto out; | |
2210 | ||
2211 | p = reply_buf; | |
2212 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
2213 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
2214 | NULL, GFP_NOIO); | |
2215 | ||
2216 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
2217 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
2218 | rbd_dev->header.object_prefix = NULL; | |
2219 | } else { | |
2220 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
2221 | } | |
2222 | ||
2223 | out: | |
2224 | kfree(reply_buf); | |
2225 | ||
2226 | return ret; | |
2227 | } | |
2228 | ||
b1b5402a AE |
2229 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2230 | u64 *snap_features) | |
2231 | { | |
2232 | __le64 snapid = cpu_to_le64(snap_id); | |
2233 | struct { | |
2234 | __le64 features; | |
2235 | __le64 incompat; | |
2236 | } features_buf = { 0 }; | |
d889140c | 2237 | u64 incompat; |
b1b5402a AE |
2238 | int ret; |
2239 | ||
2240 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2241 | "rbd", "get_features", | |
2242 | (char *) &snapid, sizeof (snapid), | |
2243 | (char *) &features_buf, sizeof (features_buf), | |
2244 | CEPH_OSD_FLAG_READ, NULL); | |
2245 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2246 | if (ret < 0) | |
2247 | return ret; | |
d889140c AE |
2248 | |
2249 | incompat = le64_to_cpu(features_buf.incompat); | |
2250 | if (incompat & ~RBD_FEATURES_ALL) | |
2251 | return -ENOTSUPP; | |
2252 | ||
b1b5402a AE |
2253 | *snap_features = le64_to_cpu(features_buf.features); |
2254 | ||
2255 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
2256 | (unsigned long long) snap_id, | |
2257 | (unsigned long long) *snap_features, | |
2258 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
2259 | ||
2260 | return 0; | |
2261 | } | |
2262 | ||
2263 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
2264 | { | |
2265 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
2266 | &rbd_dev->header.features); | |
2267 | } | |
2268 | ||
6e14b1a6 | 2269 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
2270 | { |
2271 | size_t size; | |
2272 | int ret; | |
2273 | void *reply_buf; | |
2274 | void *p; | |
2275 | void *end; | |
2276 | u64 seq; | |
2277 | u32 snap_count; | |
2278 | struct ceph_snap_context *snapc; | |
2279 | u32 i; | |
2280 | ||
2281 | /* | |
2282 | * We'll need room for the seq value (maximum snapshot id), | |
2283 | * snapshot count, and array of that many snapshot ids. | |
2284 | * For now we have a fixed upper limit on the number we're | |
2285 | * prepared to receive. | |
2286 | */ | |
2287 | size = sizeof (__le64) + sizeof (__le32) + | |
2288 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
2289 | reply_buf = kzalloc(size, GFP_KERNEL); | |
2290 | if (!reply_buf) | |
2291 | return -ENOMEM; | |
2292 | ||
2293 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2294 | "rbd", "get_snapcontext", | |
2295 | NULL, 0, | |
2296 | reply_buf, size, | |
6e14b1a6 | 2297 | CEPH_OSD_FLAG_READ, ver); |
35d489f9 AE |
2298 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); |
2299 | if (ret < 0) | |
2300 | goto out; | |
2301 | ||
2302 | ret = -ERANGE; | |
2303 | p = reply_buf; | |
2304 | end = (char *) reply_buf + size; | |
2305 | ceph_decode_64_safe(&p, end, seq, out); | |
2306 | ceph_decode_32_safe(&p, end, snap_count, out); | |
2307 | ||
2308 | /* | |
2309 | * Make sure the reported number of snapshot ids wouldn't go | |
2310 | * beyond the end of our buffer. But before checking that, | |
2311 | * make sure the computed size of the snapshot context we | |
2312 | * allocate is representable in a size_t. | |
2313 | */ | |
2314 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
2315 | / sizeof (u64)) { | |
2316 | ret = -EINVAL; | |
2317 | goto out; | |
2318 | } | |
2319 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
2320 | goto out; | |
2321 | ||
2322 | size = sizeof (struct ceph_snap_context) + | |
2323 | snap_count * sizeof (snapc->snaps[0]); | |
2324 | snapc = kmalloc(size, GFP_KERNEL); | |
2325 | if (!snapc) { | |
2326 | ret = -ENOMEM; | |
2327 | goto out; | |
2328 | } | |
2329 | ||
2330 | atomic_set(&snapc->nref, 1); | |
2331 | snapc->seq = seq; | |
2332 | snapc->num_snaps = snap_count; | |
2333 | for (i = 0; i < snap_count; i++) | |
2334 | snapc->snaps[i] = ceph_decode_64(&p); | |
2335 | ||
2336 | rbd_dev->header.snapc = snapc; | |
2337 | ||
2338 | dout(" snap context seq = %llu, snap_count = %u\n", | |
2339 | (unsigned long long) seq, (unsigned int) snap_count); | |
2340 | ||
2341 | out: | |
2342 | kfree(reply_buf); | |
2343 | ||
2344 | return 0; | |
2345 | } | |
2346 | ||
b8b1e2db AE |
2347 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
2348 | { | |
2349 | size_t size; | |
2350 | void *reply_buf; | |
2351 | __le64 snap_id; | |
2352 | int ret; | |
2353 | void *p; | |
2354 | void *end; | |
2355 | size_t snap_name_len; | |
2356 | char *snap_name; | |
2357 | ||
2358 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
2359 | reply_buf = kmalloc(size, GFP_KERNEL); | |
2360 | if (!reply_buf) | |
2361 | return ERR_PTR(-ENOMEM); | |
2362 | ||
2363 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
2364 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
2365 | "rbd", "get_snapshot_name", | |
2366 | (char *) &snap_id, sizeof (snap_id), | |
2367 | reply_buf, size, | |
2368 | CEPH_OSD_FLAG_READ, NULL); | |
2369 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2370 | if (ret < 0) | |
2371 | goto out; | |
2372 | ||
2373 | p = reply_buf; | |
2374 | end = (char *) reply_buf + size; | |
2375 | snap_name_len = 0; | |
2376 | snap_name = ceph_extract_encoded_string(&p, end, &snap_name_len, | |
2377 | GFP_KERNEL); | |
2378 | if (IS_ERR(snap_name)) { | |
2379 | ret = PTR_ERR(snap_name); | |
2380 | goto out; | |
2381 | } else { | |
2382 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
2383 | (unsigned long long) le64_to_cpu(snap_id), snap_name); | |
2384 | } | |
2385 | kfree(reply_buf); | |
2386 | ||
2387 | return snap_name; | |
2388 | out: | |
2389 | kfree(reply_buf); | |
2390 | ||
2391 | return ERR_PTR(ret); | |
2392 | } | |
2393 | ||
2394 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2395 | u64 *snap_size, u64 *snap_features) | |
2396 | { | |
2397 | __le64 snap_id; | |
2398 | u8 order; | |
2399 | int ret; | |
2400 | ||
2401 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
2402 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
2403 | if (ret) | |
2404 | return ERR_PTR(ret); | |
2405 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
2406 | if (ret) | |
2407 | return ERR_PTR(ret); | |
2408 | ||
2409 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
2410 | } | |
2411 | ||
2412 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
2413 | u64 *snap_size, u64 *snap_features) | |
2414 | { | |
2415 | if (rbd_dev->image_format == 1) | |
2416 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
2417 | snap_size, snap_features); | |
2418 | if (rbd_dev->image_format == 2) | |
2419 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
2420 | snap_size, snap_features); | |
2421 | return ERR_PTR(-EINVAL); | |
2422 | } | |
2423 | ||
117973fb AE |
2424 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
2425 | { | |
2426 | int ret; | |
2427 | __u8 obj_order; | |
2428 | ||
2429 | down_write(&rbd_dev->header_rwsem); | |
2430 | ||
2431 | /* Grab old order first, to see if it changes */ | |
2432 | ||
2433 | obj_order = rbd_dev->header.obj_order, | |
2434 | ret = rbd_dev_v2_image_size(rbd_dev); | |
2435 | if (ret) | |
2436 | goto out; | |
2437 | if (rbd_dev->header.obj_order != obj_order) { | |
2438 | ret = -EIO; | |
2439 | goto out; | |
2440 | } | |
2441 | rbd_update_mapping_size(rbd_dev); | |
2442 | ||
2443 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); | |
2444 | dout("rbd_dev_v2_snap_context returned %d\n", ret); | |
2445 | if (ret) | |
2446 | goto out; | |
2447 | ret = rbd_dev_snaps_update(rbd_dev); | |
2448 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
2449 | if (ret) | |
2450 | goto out; | |
2451 | ret = rbd_dev_snaps_register(rbd_dev); | |
2452 | dout("rbd_dev_snaps_register returned %d\n", ret); | |
2453 | out: | |
2454 | up_write(&rbd_dev->header_rwsem); | |
2455 | ||
2456 | return ret; | |
2457 | } | |
2458 | ||
dfc5606d | 2459 | /* |
35938150 AE |
2460 | * Scan the rbd device's current snapshot list and compare it to the |
2461 | * newly-received snapshot context. Remove any existing snapshots | |
2462 | * not present in the new snapshot context. Add a new snapshot for | |
2463 | * any snaphots in the snapshot context not in the current list. | |
2464 | * And verify there are no changes to snapshots we already know | |
2465 | * about. | |
2466 | * | |
2467 | * Assumes the snapshots in the snapshot context are sorted by | |
2468 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2469 | * are also maintained in that order.) | |
dfc5606d | 2470 | */ |
304f6808 | 2471 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 2472 | { |
35938150 AE |
2473 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2474 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
2475 | struct list_head *head = &rbd_dev->snaps; |
2476 | struct list_head *links = head->next; | |
2477 | u32 index = 0; | |
dfc5606d | 2478 | |
9fcbb800 | 2479 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
2480 | while (index < snap_count || links != head) { |
2481 | u64 snap_id; | |
2482 | struct rbd_snap *snap; | |
cd892126 AE |
2483 | char *snap_name; |
2484 | u64 snap_size = 0; | |
2485 | u64 snap_features = 0; | |
dfc5606d | 2486 | |
35938150 AE |
2487 | snap_id = index < snap_count ? snapc->snaps[index] |
2488 | : CEPH_NOSNAP; | |
2489 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2490 | : NULL; | |
aafb230e | 2491 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 2492 | |
35938150 AE |
2493 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2494 | struct list_head *next = links->next; | |
dfc5606d | 2495 | |
35938150 | 2496 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2497 | |
f84344f3 AE |
2498 | if (rbd_dev->mapping.snap_id == snap->id) |
2499 | rbd_dev->mapping.snap_exists = false; | |
35938150 | 2500 | __rbd_remove_snap_dev(snap); |
9fcbb800 | 2501 | dout("%ssnap id %llu has been removed\n", |
f84344f3 AE |
2502 | rbd_dev->mapping.snap_id == snap->id ? |
2503 | "mapped " : "", | |
9fcbb800 | 2504 | (unsigned long long) snap->id); |
35938150 AE |
2505 | |
2506 | /* Done with this list entry; advance */ | |
2507 | ||
2508 | links = next; | |
dfc5606d YS |
2509 | continue; |
2510 | } | |
35938150 | 2511 | |
b8b1e2db AE |
2512 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
2513 | &snap_size, &snap_features); | |
cd892126 AE |
2514 | if (IS_ERR(snap_name)) |
2515 | return PTR_ERR(snap_name); | |
2516 | ||
9fcbb800 AE |
2517 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
2518 | (unsigned long long) snap_id); | |
35938150 AE |
2519 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
2520 | struct rbd_snap *new_snap; | |
2521 | ||
2522 | /* We haven't seen this snapshot before */ | |
2523 | ||
c8d18425 | 2524 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 2525 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
2526 | if (IS_ERR(new_snap)) { |
2527 | int err = PTR_ERR(new_snap); | |
2528 | ||
2529 | dout(" failed to add dev, error %d\n", err); | |
2530 | ||
2531 | return err; | |
2532 | } | |
35938150 AE |
2533 | |
2534 | /* New goes before existing, or at end of list */ | |
2535 | ||
9fcbb800 | 2536 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
2537 | if (snap) |
2538 | list_add_tail(&new_snap->node, &snap->node); | |
2539 | else | |
523f3258 | 2540 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2541 | } else { |
2542 | /* Already have this one */ | |
2543 | ||
9fcbb800 AE |
2544 | dout(" already present\n"); |
2545 | ||
cd892126 | 2546 | rbd_assert(snap->size == snap_size); |
aafb230e | 2547 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 2548 | rbd_assert(snap->features == snap_features); |
35938150 AE |
2549 | |
2550 | /* Done with this list entry; advance */ | |
2551 | ||
2552 | links = links->next; | |
dfc5606d | 2553 | } |
35938150 AE |
2554 | |
2555 | /* Advance to the next entry in the snapshot context */ | |
2556 | ||
2557 | index++; | |
dfc5606d | 2558 | } |
9fcbb800 | 2559 | dout("%s: done\n", __func__); |
dfc5606d YS |
2560 | |
2561 | return 0; | |
2562 | } | |
2563 | ||
304f6808 AE |
2564 | /* |
2565 | * Scan the list of snapshots and register the devices for any that | |
2566 | * have not already been registered. | |
2567 | */ | |
2568 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
2569 | { | |
2570 | struct rbd_snap *snap; | |
2571 | int ret = 0; | |
2572 | ||
2573 | dout("%s called\n", __func__); | |
86ff77bb AE |
2574 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
2575 | return -EIO; | |
304f6808 AE |
2576 | |
2577 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2578 | if (!rbd_snap_registered(snap)) { | |
2579 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
2580 | if (ret < 0) | |
2581 | break; | |
2582 | } | |
2583 | } | |
2584 | dout("%s: returning %d\n", __func__, ret); | |
2585 | ||
2586 | return ret; | |
2587 | } | |
2588 | ||
dfc5606d YS |
2589 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2590 | { | |
dfc5606d | 2591 | struct device *dev; |
cd789ab9 | 2592 | int ret; |
dfc5606d YS |
2593 | |
2594 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 2595 | |
cd789ab9 | 2596 | dev = &rbd_dev->dev; |
dfc5606d YS |
2597 | dev->bus = &rbd_bus_type; |
2598 | dev->type = &rbd_device_type; | |
2599 | dev->parent = &rbd_root_dev; | |
2600 | dev->release = rbd_dev_release; | |
de71a297 | 2601 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 2602 | ret = device_register(dev); |
dfc5606d | 2603 | |
dfc5606d | 2604 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 2605 | |
dfc5606d | 2606 | return ret; |
602adf40 YS |
2607 | } |
2608 | ||
dfc5606d YS |
2609 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2610 | { | |
2611 | device_unregister(&rbd_dev->dev); | |
2612 | } | |
2613 | ||
59c2be1e YS |
2614 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2615 | { | |
2616 | int ret, rc; | |
2617 | ||
2618 | do { | |
0e6f322d | 2619 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2620 | if (ret == -ERANGE) { |
117973fb | 2621 | rc = rbd_dev_refresh(rbd_dev, NULL); |
59c2be1e YS |
2622 | if (rc < 0) |
2623 | return rc; | |
2624 | } | |
2625 | } while (ret == -ERANGE); | |
2626 | ||
2627 | return ret; | |
2628 | } | |
2629 | ||
e2839308 | 2630 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
2631 | |
2632 | /* | |
499afd5b AE |
2633 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2634 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2635 | */ |
e2839308 | 2636 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2637 | { |
e2839308 | 2638 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
2639 | |
2640 | spin_lock(&rbd_dev_list_lock); | |
2641 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2642 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
2643 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
2644 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 2645 | } |
b7f23c36 | 2646 | |
1ddbe94e | 2647 | /* |
499afd5b AE |
2648 | * Remove an rbd_dev from the global list, and record that its |
2649 | * identifier is no longer in use. | |
1ddbe94e | 2650 | */ |
e2839308 | 2651 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2652 | { |
d184f6bf | 2653 | struct list_head *tmp; |
de71a297 | 2654 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2655 | int max_id; |
2656 | ||
aafb230e | 2657 | rbd_assert(rbd_id > 0); |
499afd5b | 2658 | |
e2839308 AE |
2659 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
2660 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
2661 | spin_lock(&rbd_dev_list_lock); |
2662 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2663 | |
2664 | /* | |
2665 | * If the id being "put" is not the current maximum, there | |
2666 | * is nothing special we need to do. | |
2667 | */ | |
e2839308 | 2668 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
2669 | spin_unlock(&rbd_dev_list_lock); |
2670 | return; | |
2671 | } | |
2672 | ||
2673 | /* | |
2674 | * We need to update the current maximum id. Search the | |
2675 | * list to find out what it is. We're more likely to find | |
2676 | * the maximum at the end, so search the list backward. | |
2677 | */ | |
2678 | max_id = 0; | |
2679 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2680 | struct rbd_device *rbd_dev; | |
2681 | ||
2682 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2683 | if (rbd_id > max_id) | |
2684 | max_id = rbd_id; | |
2685 | } | |
499afd5b | 2686 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2687 | |
1ddbe94e | 2688 | /* |
e2839308 | 2689 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
2690 | * which case it now accurately reflects the new maximum. |
2691 | * Be careful not to overwrite the maximum value in that | |
2692 | * case. | |
1ddbe94e | 2693 | */ |
e2839308 AE |
2694 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
2695 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
2696 | } |
2697 | ||
e28fff26 AE |
2698 | /* |
2699 | * Skips over white space at *buf, and updates *buf to point to the | |
2700 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2701 | * the token (string of non-white space characters) found. Note |
2702 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2703 | */ |
2704 | static inline size_t next_token(const char **buf) | |
2705 | { | |
2706 | /* | |
2707 | * These are the characters that produce nonzero for | |
2708 | * isspace() in the "C" and "POSIX" locales. | |
2709 | */ | |
2710 | const char *spaces = " \f\n\r\t\v"; | |
2711 | ||
2712 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2713 | ||
2714 | return strcspn(*buf, spaces); /* Return token length */ | |
2715 | } | |
2716 | ||
2717 | /* | |
2718 | * Finds the next token in *buf, and if the provided token buffer is | |
2719 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2720 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2721 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2722 | * |
2723 | * Returns the length of the token found (not including the '\0'). | |
2724 | * Return value will be 0 if no token is found, and it will be >= | |
2725 | * token_size if the token would not fit. | |
2726 | * | |
593a9e7b | 2727 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2728 | * found token. Note that this occurs even if the token buffer is |
2729 | * too small to hold it. | |
2730 | */ | |
2731 | static inline size_t copy_token(const char **buf, | |
2732 | char *token, | |
2733 | size_t token_size) | |
2734 | { | |
2735 | size_t len; | |
2736 | ||
2737 | len = next_token(buf); | |
2738 | if (len < token_size) { | |
2739 | memcpy(token, *buf, len); | |
2740 | *(token + len) = '\0'; | |
2741 | } | |
2742 | *buf += len; | |
2743 | ||
2744 | return len; | |
2745 | } | |
2746 | ||
ea3352f4 AE |
2747 | /* |
2748 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2749 | * enough to hold a copy of it, and copies the token into the new | |
2750 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2751 | * that a duplicate buffer is created even for a zero-length token. | |
2752 | * | |
2753 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2754 | * pointer if memory for the duplicate was not available. If | |
2755 | * the lenp argument is a non-null pointer, the length of the token | |
2756 | * (not including the '\0') is returned in *lenp. | |
2757 | * | |
2758 | * If successful, the *buf pointer will be updated to point beyond | |
2759 | * the end of the found token. | |
2760 | * | |
2761 | * Note: uses GFP_KERNEL for allocation. | |
2762 | */ | |
2763 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2764 | { | |
2765 | char *dup; | |
2766 | size_t len; | |
2767 | ||
2768 | len = next_token(buf); | |
2769 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2770 | if (!dup) | |
2771 | return NULL; | |
2772 | ||
2773 | memcpy(dup, *buf, len); | |
2774 | *(dup + len) = '\0'; | |
2775 | *buf += len; | |
2776 | ||
2777 | if (lenp) | |
2778 | *lenp = len; | |
2779 | ||
2780 | return dup; | |
2781 | } | |
2782 | ||
a725f65e | 2783 | /* |
3feeb894 AE |
2784 | * This fills in the pool_name, image_name, image_name_len, rbd_dev, |
2785 | * rbd_md_name, and name fields of the given rbd_dev, based on the | |
2786 | * list of monitor addresses and other options provided via | |
2787 | * /sys/bus/rbd/add. Returns a pointer to a dynamically-allocated | |
2788 | * copy of the snapshot name to map if successful, or a | |
2789 | * pointer-coded error otherwise. | |
d22f76e7 AE |
2790 | * |
2791 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e | 2792 | */ |
3feeb894 AE |
2793 | static char *rbd_add_parse_args(struct rbd_device *rbd_dev, |
2794 | const char *buf, | |
2795 | const char **mon_addrs, | |
2796 | size_t *mon_addrs_size, | |
2797 | char *options, | |
2798 | size_t options_size) | |
e28fff26 | 2799 | { |
d22f76e7 | 2800 | size_t len; |
3feeb894 AE |
2801 | char *err_ptr = ERR_PTR(-EINVAL); |
2802 | char *snap_name; | |
e28fff26 AE |
2803 | |
2804 | /* The first four tokens are required */ | |
2805 | ||
7ef3214a AE |
2806 | len = next_token(&buf); |
2807 | if (!len) | |
3feeb894 | 2808 | return err_ptr; |
5214ecc4 | 2809 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2810 | *mon_addrs = buf; |
2811 | ||
2812 | buf += len; | |
a725f65e | 2813 | |
e28fff26 AE |
2814 | len = copy_token(&buf, options, options_size); |
2815 | if (!len || len >= options_size) | |
3feeb894 | 2816 | return err_ptr; |
e28fff26 | 2817 | |
3feeb894 | 2818 | err_ptr = ERR_PTR(-ENOMEM); |
d22f76e7 AE |
2819 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2820 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2821 | goto out_err; |
e28fff26 | 2822 | |
0bed54dc AE |
2823 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2824 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2825 | goto out_err; |
a725f65e | 2826 | |
3feeb894 AE |
2827 | /* Snapshot name is optional */ |
2828 | len = next_token(&buf); | |
820a5f3e | 2829 | if (!len) { |
3feeb894 AE |
2830 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
2831 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
849b4260 | 2832 | } |
3feeb894 AE |
2833 | snap_name = kmalloc(len + 1, GFP_KERNEL); |
2834 | if (!snap_name) | |
2835 | goto out_err; | |
2836 | memcpy(snap_name, buf, len); | |
2837 | *(snap_name + len) = '\0'; | |
e28fff26 | 2838 | |
3feeb894 AE |
2839 | dout(" SNAP_NAME is <%s>, len is %zd\n", snap_name, len); |
2840 | ||
2841 | return snap_name; | |
d22f76e7 AE |
2842 | |
2843 | out_err: | |
0bed54dc | 2844 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2845 | rbd_dev->image_name = NULL; |
2846 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2847 | kfree(rbd_dev->pool_name); |
2848 | rbd_dev->pool_name = NULL; | |
2849 | ||
3feeb894 | 2850 | return err_ptr; |
a725f65e AE |
2851 | } |
2852 | ||
589d30e0 AE |
2853 | /* |
2854 | * An rbd format 2 image has a unique identifier, distinct from the | |
2855 | * name given to it by the user. Internally, that identifier is | |
2856 | * what's used to specify the names of objects related to the image. | |
2857 | * | |
2858 | * A special "rbd id" object is used to map an rbd image name to its | |
2859 | * id. If that object doesn't exist, then there is no v2 rbd image | |
2860 | * with the supplied name. | |
2861 | * | |
2862 | * This function will record the given rbd_dev's image_id field if | |
2863 | * it can be determined, and in that case will return 0. If any | |
2864 | * errors occur a negative errno will be returned and the rbd_dev's | |
2865 | * image_id field will be unchanged (and should be NULL). | |
2866 | */ | |
2867 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
2868 | { | |
2869 | int ret; | |
2870 | size_t size; | |
2871 | char *object_name; | |
2872 | void *response; | |
2873 | void *p; | |
2874 | ||
2875 | /* | |
2876 | * First, see if the format 2 image id file exists, and if | |
2877 | * so, get the image's persistent id from it. | |
2878 | */ | |
2879 | size = sizeof (RBD_ID_PREFIX) + rbd_dev->image_name_len; | |
2880 | object_name = kmalloc(size, GFP_NOIO); | |
2881 | if (!object_name) | |
2882 | return -ENOMEM; | |
2883 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->image_name); | |
2884 | dout("rbd id object name is %s\n", object_name); | |
2885 | ||
2886 | /* Response will be an encoded string, which includes a length */ | |
2887 | ||
2888 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
2889 | response = kzalloc(size, GFP_NOIO); | |
2890 | if (!response) { | |
2891 | ret = -ENOMEM; | |
2892 | goto out; | |
2893 | } | |
2894 | ||
2895 | ret = rbd_req_sync_exec(rbd_dev, object_name, | |
2896 | "rbd", "get_id", | |
2897 | NULL, 0, | |
2898 | response, RBD_IMAGE_ID_LEN_MAX, | |
2899 | CEPH_OSD_FLAG_READ, NULL); | |
2900 | dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); | |
2901 | if (ret < 0) | |
2902 | goto out; | |
2903 | ||
2904 | p = response; | |
2905 | rbd_dev->image_id = ceph_extract_encoded_string(&p, | |
2906 | p + RBD_IMAGE_ID_LEN_MAX, | |
2907 | &rbd_dev->image_id_len, | |
2908 | GFP_NOIO); | |
2909 | if (IS_ERR(rbd_dev->image_id)) { | |
2910 | ret = PTR_ERR(rbd_dev->image_id); | |
2911 | rbd_dev->image_id = NULL; | |
2912 | } else { | |
2913 | dout("image_id is %s\n", rbd_dev->image_id); | |
2914 | } | |
2915 | out: | |
2916 | kfree(response); | |
2917 | kfree(object_name); | |
2918 | ||
2919 | return ret; | |
2920 | } | |
2921 | ||
a30b71b9 AE |
2922 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
2923 | { | |
2924 | int ret; | |
2925 | size_t size; | |
2926 | ||
2927 | /* Version 1 images have no id; empty string is used */ | |
2928 | ||
2929 | rbd_dev->image_id = kstrdup("", GFP_KERNEL); | |
2930 | if (!rbd_dev->image_id) | |
2931 | return -ENOMEM; | |
2932 | rbd_dev->image_id_len = 0; | |
2933 | ||
2934 | /* Record the header object name for this rbd image. */ | |
2935 | ||
2936 | size = rbd_dev->image_name_len + sizeof (RBD_SUFFIX); | |
2937 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2938 | if (!rbd_dev->header_name) { | |
2939 | ret = -ENOMEM; | |
2940 | goto out_err; | |
2941 | } | |
2942 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); | |
2943 | ||
2944 | /* Populate rbd image metadata */ | |
2945 | ||
2946 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
2947 | if (ret < 0) | |
2948 | goto out_err; | |
2949 | rbd_dev->image_format = 1; | |
2950 | ||
2951 | dout("discovered version 1 image, header name is %s\n", | |
2952 | rbd_dev->header_name); | |
2953 | ||
2954 | return 0; | |
2955 | ||
2956 | out_err: | |
2957 | kfree(rbd_dev->header_name); | |
2958 | rbd_dev->header_name = NULL; | |
2959 | kfree(rbd_dev->image_id); | |
2960 | rbd_dev->image_id = NULL; | |
2961 | ||
2962 | return ret; | |
2963 | } | |
2964 | ||
2965 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
2966 | { | |
2967 | size_t size; | |
9d475de5 | 2968 | int ret; |
6e14b1a6 | 2969 | u64 ver = 0; |
a30b71b9 AE |
2970 | |
2971 | /* | |
2972 | * Image id was filled in by the caller. Record the header | |
2973 | * object name for this rbd image. | |
2974 | */ | |
2975 | size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->image_id_len; | |
2976 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
2977 | if (!rbd_dev->header_name) | |
2978 | return -ENOMEM; | |
2979 | sprintf(rbd_dev->header_name, "%s%s", | |
2980 | RBD_HEADER_PREFIX, rbd_dev->image_id); | |
9d475de5 AE |
2981 | |
2982 | /* Get the size and object order for the image */ | |
2983 | ||
2984 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
2985 | if (ret < 0) |
2986 | goto out_err; | |
2987 | ||
2988 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
2989 | ||
2990 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
2991 | if (ret < 0) |
2992 | goto out_err; | |
2993 | ||
d889140c | 2994 | /* Get the and check features for the image */ |
b1b5402a AE |
2995 | |
2996 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
2997 | if (ret < 0) |
2998 | goto out_err; | |
35d489f9 | 2999 | |
6e14b1a6 AE |
3000 | /* crypto and compression type aren't (yet) supported for v2 images */ |
3001 | ||
3002 | rbd_dev->header.crypt_type = 0; | |
3003 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 3004 | |
6e14b1a6 AE |
3005 | /* Get the snapshot context, plus the header version */ |
3006 | ||
3007 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
3008 | if (ret) |
3009 | goto out_err; | |
6e14b1a6 AE |
3010 | rbd_dev->header.obj_version = ver; |
3011 | ||
a30b71b9 AE |
3012 | rbd_dev->image_format = 2; |
3013 | ||
3014 | dout("discovered version 2 image, header name is %s\n", | |
3015 | rbd_dev->header_name); | |
3016 | ||
3017 | return -ENOTSUPP; | |
9d475de5 AE |
3018 | out_err: |
3019 | kfree(rbd_dev->header_name); | |
3020 | rbd_dev->header_name = NULL; | |
1e130199 AE |
3021 | kfree(rbd_dev->header.object_prefix); |
3022 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
3023 | |
3024 | return ret; | |
a30b71b9 AE |
3025 | } |
3026 | ||
3027 | /* | |
3028 | * Probe for the existence of the header object for the given rbd | |
3029 | * device. For format 2 images this includes determining the image | |
3030 | * id. | |
3031 | */ | |
3032 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
3033 | { | |
3034 | int ret; | |
3035 | ||
3036 | /* | |
3037 | * Get the id from the image id object. If it's not a | |
3038 | * format 2 image, we'll get ENOENT back, and we'll assume | |
3039 | * it's a format 1 image. | |
3040 | */ | |
3041 | ret = rbd_dev_image_id(rbd_dev); | |
3042 | if (ret) | |
3043 | ret = rbd_dev_v1_probe(rbd_dev); | |
3044 | else | |
3045 | ret = rbd_dev_v2_probe(rbd_dev); | |
3046 | if (ret) | |
3047 | dout("probe failed, returning %d\n", ret); | |
3048 | ||
3049 | return ret; | |
3050 | } | |
3051 | ||
59c2be1e YS |
3052 | static ssize_t rbd_add(struct bus_type *bus, |
3053 | const char *buf, | |
3054 | size_t count) | |
602adf40 | 3055 | { |
cb8627c7 AE |
3056 | char *options; |
3057 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
3058 | const char *mon_addrs = NULL; |
3059 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
3060 | struct ceph_osd_client *osdc; |
3061 | int rc = -ENOMEM; | |
3feeb894 | 3062 | char *snap_name; |
602adf40 YS |
3063 | |
3064 | if (!try_module_get(THIS_MODULE)) | |
3065 | return -ENODEV; | |
3066 | ||
60571c7d | 3067 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 3068 | if (!options) |
85ae8926 | 3069 | goto err_out_mem; |
cb8627c7 AE |
3070 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
3071 | if (!rbd_dev) | |
85ae8926 | 3072 | goto err_out_mem; |
602adf40 YS |
3073 | |
3074 | /* static rbd_device initialization */ | |
3075 | spin_lock_init(&rbd_dev->lock); | |
3076 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 3077 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 3078 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 3079 | |
602adf40 | 3080 | /* parse add command */ |
3feeb894 AE |
3081 | snap_name = rbd_add_parse_args(rbd_dev, buf, |
3082 | &mon_addrs, &mon_addrs_size, options, count); | |
3083 | if (IS_ERR(snap_name)) { | |
3084 | rc = PTR_ERR(snap_name); | |
85ae8926 | 3085 | goto err_out_mem; |
3feeb894 | 3086 | } |
e124a82f | 3087 | |
f8c38929 AE |
3088 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
3089 | if (rc < 0) | |
85ae8926 | 3090 | goto err_out_args; |
602adf40 | 3091 | |
602adf40 | 3092 | /* pick the pool */ |
1dbb4399 | 3093 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
3094 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
3095 | if (rc < 0) | |
3096 | goto err_out_client; | |
9bb2f334 | 3097 | rbd_dev->pool_id = rc; |
602adf40 | 3098 | |
a30b71b9 AE |
3099 | rc = rbd_dev_probe(rbd_dev); |
3100 | if (rc < 0) | |
05fd6f6f AE |
3101 | goto err_out_client; |
3102 | ||
3103 | /* no need to lock here, as rbd_dev is not registered yet */ | |
3104 | rc = rbd_dev_snaps_update(rbd_dev); | |
3105 | if (rc) | |
3106 | goto err_out_header; | |
3107 | ||
3108 | rc = rbd_dev_set_mapping(rbd_dev, snap_name); | |
3109 | if (rc) | |
3110 | goto err_out_header; | |
3111 | ||
85ae8926 AE |
3112 | /* generate unique id: find highest unique id, add one */ |
3113 | rbd_dev_id_get(rbd_dev); | |
3114 | ||
3115 | /* Fill in the device name, now that we have its id. */ | |
3116 | BUILD_BUG_ON(DEV_NAME_LEN | |
3117 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
3118 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
3119 | ||
3120 | /* Get our block major device number. */ | |
3121 | ||
27cc2594 AE |
3122 | rc = register_blkdev(0, rbd_dev->name); |
3123 | if (rc < 0) | |
85ae8926 | 3124 | goto err_out_id; |
27cc2594 | 3125 | rbd_dev->major = rc; |
602adf40 | 3126 | |
0f308a31 AE |
3127 | /* Set up the blkdev mapping. */ |
3128 | ||
3129 | rc = rbd_init_disk(rbd_dev); | |
dfc5606d | 3130 | if (rc) |
766fc439 YS |
3131 | goto err_out_blkdev; |
3132 | ||
0f308a31 AE |
3133 | rc = rbd_bus_add_dev(rbd_dev); |
3134 | if (rc) | |
3135 | goto err_out_disk; | |
3136 | ||
32eec68d AE |
3137 | /* |
3138 | * At this point cleanup in the event of an error is the job | |
3139 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
32eec68d | 3140 | */ |
2ac4e75d | 3141 | |
4bb1f1ed | 3142 | down_write(&rbd_dev->header_rwsem); |
5ed16177 | 3143 | rc = rbd_dev_snaps_register(rbd_dev); |
4bb1f1ed | 3144 | up_write(&rbd_dev->header_rwsem); |
2ac4e75d AE |
3145 | if (rc) |
3146 | goto err_out_bus; | |
3147 | ||
3ee4001e AE |
3148 | rc = rbd_init_watch_dev(rbd_dev); |
3149 | if (rc) | |
3150 | goto err_out_bus; | |
3151 | ||
2ac4e75d AE |
3152 | /* Everything's ready. Announce the disk to the world. */ |
3153 | ||
2ac4e75d | 3154 | add_disk(rbd_dev->disk); |
3ee4001e | 3155 | |
2ac4e75d AE |
3156 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
3157 | (unsigned long long) rbd_dev->mapping.size); | |
3158 | ||
602adf40 YS |
3159 | return count; |
3160 | ||
766fc439 | 3161 | err_out_bus: |
766fc439 YS |
3162 | /* this will also clean up rest of rbd_dev stuff */ |
3163 | ||
3164 | rbd_bus_del_dev(rbd_dev); | |
3165 | kfree(options); | |
766fc439 YS |
3166 | return rc; |
3167 | ||
0f308a31 AE |
3168 | err_out_disk: |
3169 | rbd_free_disk(rbd_dev); | |
602adf40 YS |
3170 | err_out_blkdev: |
3171 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
85ae8926 AE |
3172 | err_out_id: |
3173 | rbd_dev_id_put(rbd_dev); | |
05fd6f6f AE |
3174 | err_out_header: |
3175 | rbd_header_free(&rbd_dev->header); | |
602adf40 | 3176 | err_out_client: |
3fcf2581 | 3177 | kfree(rbd_dev->header_name); |
602adf40 | 3178 | rbd_put_client(rbd_dev); |
589d30e0 | 3179 | kfree(rbd_dev->image_id); |
85ae8926 AE |
3180 | err_out_args: |
3181 | kfree(rbd_dev->mapping.snap_name); | |
3182 | kfree(rbd_dev->image_name); | |
3183 | kfree(rbd_dev->pool_name); | |
3184 | err_out_mem: | |
27cc2594 | 3185 | kfree(rbd_dev); |
cb8627c7 | 3186 | kfree(options); |
27cc2594 | 3187 | |
602adf40 YS |
3188 | dout("Error adding device %s\n", buf); |
3189 | module_put(THIS_MODULE); | |
27cc2594 AE |
3190 | |
3191 | return (ssize_t) rc; | |
602adf40 YS |
3192 | } |
3193 | ||
de71a297 | 3194 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
3195 | { |
3196 | struct list_head *tmp; | |
3197 | struct rbd_device *rbd_dev; | |
3198 | ||
e124a82f | 3199 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
3200 | list_for_each(tmp, &rbd_dev_list) { |
3201 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 3202 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 3203 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 3204 | return rbd_dev; |
e124a82f | 3205 | } |
602adf40 | 3206 | } |
e124a82f | 3207 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
3208 | return NULL; |
3209 | } | |
3210 | ||
dfc5606d | 3211 | static void rbd_dev_release(struct device *dev) |
602adf40 | 3212 | { |
593a9e7b | 3213 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3214 | |
1dbb4399 AE |
3215 | if (rbd_dev->watch_request) { |
3216 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
3217 | ||
3218 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 3219 | rbd_dev->watch_request); |
1dbb4399 | 3220 | } |
59c2be1e | 3221 | if (rbd_dev->watch_event) |
070c633f | 3222 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 3223 | |
602adf40 YS |
3224 | rbd_put_client(rbd_dev); |
3225 | ||
3226 | /* clean up and free blkdev */ | |
3227 | rbd_free_disk(rbd_dev); | |
3228 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 3229 | |
2ac4e75d AE |
3230 | /* release allocated disk header fields */ |
3231 | rbd_header_free(&rbd_dev->header); | |
3232 | ||
32eec68d | 3233 | /* done with the id, and with the rbd_dev */ |
f84344f3 | 3234 | kfree(rbd_dev->mapping.snap_name); |
589d30e0 | 3235 | kfree(rbd_dev->image_id); |
0bed54dc | 3236 | kfree(rbd_dev->header_name); |
d22f76e7 | 3237 | kfree(rbd_dev->pool_name); |
0bed54dc | 3238 | kfree(rbd_dev->image_name); |
e2839308 | 3239 | rbd_dev_id_put(rbd_dev); |
602adf40 YS |
3240 | kfree(rbd_dev); |
3241 | ||
3242 | /* release module ref */ | |
3243 | module_put(THIS_MODULE); | |
602adf40 YS |
3244 | } |
3245 | ||
dfc5606d YS |
3246 | static ssize_t rbd_remove(struct bus_type *bus, |
3247 | const char *buf, | |
3248 | size_t count) | |
602adf40 YS |
3249 | { |
3250 | struct rbd_device *rbd_dev = NULL; | |
3251 | int target_id, rc; | |
3252 | unsigned long ul; | |
3253 | int ret = count; | |
3254 | ||
3255 | rc = strict_strtoul(buf, 10, &ul); | |
3256 | if (rc) | |
3257 | return rc; | |
3258 | ||
3259 | /* convert to int; abort if we lost anything in the conversion */ | |
3260 | target_id = (int) ul; | |
3261 | if (target_id != ul) | |
3262 | return -EINVAL; | |
3263 | ||
3264 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3265 | ||
3266 | rbd_dev = __rbd_get_dev(target_id); | |
3267 | if (!rbd_dev) { | |
3268 | ret = -ENOENT; | |
3269 | goto done; | |
3270 | } | |
3271 | ||
dfc5606d YS |
3272 | __rbd_remove_all_snaps(rbd_dev); |
3273 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
3274 | |
3275 | done: | |
3276 | mutex_unlock(&ctl_mutex); | |
aafb230e | 3277 | |
602adf40 YS |
3278 | return ret; |
3279 | } | |
3280 | ||
602adf40 YS |
3281 | /* |
3282 | * create control files in sysfs | |
dfc5606d | 3283 | * /sys/bus/rbd/... |
602adf40 YS |
3284 | */ |
3285 | static int rbd_sysfs_init(void) | |
3286 | { | |
dfc5606d | 3287 | int ret; |
602adf40 | 3288 | |
fed4c143 | 3289 | ret = device_register(&rbd_root_dev); |
21079786 | 3290 | if (ret < 0) |
dfc5606d | 3291 | return ret; |
602adf40 | 3292 | |
fed4c143 AE |
3293 | ret = bus_register(&rbd_bus_type); |
3294 | if (ret < 0) | |
3295 | device_unregister(&rbd_root_dev); | |
602adf40 | 3296 | |
602adf40 YS |
3297 | return ret; |
3298 | } | |
3299 | ||
3300 | static void rbd_sysfs_cleanup(void) | |
3301 | { | |
dfc5606d | 3302 | bus_unregister(&rbd_bus_type); |
fed4c143 | 3303 | device_unregister(&rbd_root_dev); |
602adf40 YS |
3304 | } |
3305 | ||
3306 | int __init rbd_init(void) | |
3307 | { | |
3308 | int rc; | |
3309 | ||
3310 | rc = rbd_sysfs_init(); | |
3311 | if (rc) | |
3312 | return rc; | |
f0f8cef5 | 3313 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
3314 | return 0; |
3315 | } | |
3316 | ||
3317 | void __exit rbd_exit(void) | |
3318 | { | |
3319 | rbd_sysfs_cleanup(); | |
3320 | } | |
3321 | ||
3322 | module_init(rbd_init); | |
3323 | module_exit(rbd_exit); | |
3324 | ||
3325 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
3326 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
3327 | MODULE_DESCRIPTION("rados block device"); | |
3328 | ||
3329 | /* following authorship retained from original osdblk.c */ | |
3330 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
3331 | ||
3332 | MODULE_LICENSE("GPL"); |