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 | ||
593a9e7b AE |
44 | /* |
45 | * The basic unit of block I/O is a sector. It is interpreted in a | |
46 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
47 | * universally 512 bytes. These symbols are just slightly more | |
48 | * meaningful than the bare numbers they represent. | |
49 | */ | |
50 | #define SECTOR_SHIFT 9 | |
51 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
52 | ||
f0f8cef5 AE |
53 | #define RBD_DRV_NAME "rbd" |
54 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
55 | |
56 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
57 | ||
602adf40 YS |
58 | #define RBD_MAX_SNAP_NAME_LEN 32 |
59 | #define RBD_MAX_OPT_LEN 1024 | |
60 | ||
61 | #define RBD_SNAP_HEAD_NAME "-" | |
62 | ||
81a89793 AE |
63 | /* |
64 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
65 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
66 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
67 | * enough to hold all possible device names. | |
68 | */ | |
602adf40 | 69 | #define DEV_NAME_LEN 32 |
81a89793 | 70 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 71 | |
cc0538b6 | 72 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 73 | |
602adf40 YS |
74 | /* |
75 | * block device image metadata (in-memory version) | |
76 | */ | |
77 | struct rbd_image_header { | |
78 | u64 image_size; | |
849b4260 | 79 | char *object_prefix; |
602adf40 YS |
80 | __u8 obj_order; |
81 | __u8 crypt_type; | |
82 | __u8 comp_type; | |
602adf40 | 83 | struct ceph_snap_context *snapc; |
602adf40 YS |
84 | u32 total_snaps; |
85 | ||
86 | char *snap_names; | |
87 | u64 *snap_sizes; | |
59c2be1e YS |
88 | |
89 | u64 obj_version; | |
90 | }; | |
91 | ||
92 | struct rbd_options { | |
cc0538b6 | 93 | bool read_only; |
602adf40 YS |
94 | }; |
95 | ||
96 | /* | |
f0f8cef5 | 97 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
98 | */ |
99 | struct rbd_client { | |
100 | struct ceph_client *client; | |
101 | struct kref kref; | |
102 | struct list_head node; | |
103 | }; | |
104 | ||
105 | /* | |
f0f8cef5 | 106 | * a request completion status |
602adf40 | 107 | */ |
1fec7093 YS |
108 | struct rbd_req_status { |
109 | int done; | |
110 | int rc; | |
111 | u64 bytes; | |
112 | }; | |
113 | ||
114 | /* | |
115 | * a collection of requests | |
116 | */ | |
117 | struct rbd_req_coll { | |
118 | int total; | |
119 | int num_done; | |
120 | struct kref kref; | |
121 | struct rbd_req_status status[0]; | |
602adf40 YS |
122 | }; |
123 | ||
f0f8cef5 AE |
124 | /* |
125 | * a single io request | |
126 | */ | |
127 | struct rbd_request { | |
128 | struct request *rq; /* blk layer request */ | |
129 | struct bio *bio; /* cloned bio */ | |
130 | struct page **pages; /* list of used pages */ | |
131 | u64 len; | |
132 | int coll_index; | |
133 | struct rbd_req_coll *coll; | |
134 | }; | |
135 | ||
dfc5606d YS |
136 | struct rbd_snap { |
137 | struct device dev; | |
138 | const char *name; | |
3591538f | 139 | u64 size; |
dfc5606d YS |
140 | struct list_head node; |
141 | u64 id; | |
142 | }; | |
143 | ||
602adf40 YS |
144 | /* |
145 | * a single device | |
146 | */ | |
147 | struct rbd_device { | |
de71a297 | 148 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
149 | |
150 | int major; /* blkdev assigned major */ | |
151 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
152 | struct request_queue *q; | |
153 | ||
f8c38929 | 154 | struct rbd_options rbd_opts; |
602adf40 YS |
155 | struct rbd_client *rbd_client; |
156 | ||
157 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
158 | ||
159 | spinlock_t lock; /* queue lock */ | |
160 | ||
161 | struct rbd_image_header header; | |
0bed54dc AE |
162 | char *image_name; |
163 | size_t image_name_len; | |
164 | char *header_name; | |
d22f76e7 | 165 | char *pool_name; |
9bb2f334 | 166 | int pool_id; |
602adf40 | 167 | |
59c2be1e YS |
168 | struct ceph_osd_event *watch_event; |
169 | struct ceph_osd_request *watch_request; | |
170 | ||
c666601a JD |
171 | /* protects updating the header */ |
172 | struct rw_semaphore header_rwsem; | |
e88a36ec | 173 | /* name of the snapshot this device reads from */ |
820a5f3e | 174 | char *snap_name; |
e88a36ec | 175 | /* id of the snapshot this device reads from */ |
77dfe99f | 176 | u64 snap_id; /* current snapshot id */ |
e88a36ec JD |
177 | /* whether the snap_id this device reads from still exists */ |
178 | bool snap_exists; | |
cc0538b6 | 179 | bool read_only; |
602adf40 YS |
180 | |
181 | struct list_head node; | |
dfc5606d YS |
182 | |
183 | /* list of snapshots */ | |
184 | struct list_head snaps; | |
185 | ||
186 | /* sysfs related */ | |
187 | struct device dev; | |
188 | }; | |
189 | ||
602adf40 | 190 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 191 | |
602adf40 | 192 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
193 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
194 | ||
432b8587 AE |
195 | static LIST_HEAD(rbd_client_list); /* clients */ |
196 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 197 | |
dfc5606d YS |
198 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
199 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
200 | static ssize_t rbd_snap_add(struct device *dev, |
201 | struct device_attribute *attr, | |
202 | const char *buf, | |
203 | size_t count); | |
14e7085d | 204 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 205 | |
f0f8cef5 AE |
206 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
207 | size_t count); | |
208 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
209 | size_t count); | |
210 | ||
211 | static struct bus_attribute rbd_bus_attrs[] = { | |
212 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
213 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
214 | __ATTR_NULL | |
215 | }; | |
216 | ||
217 | static struct bus_type rbd_bus_type = { | |
218 | .name = "rbd", | |
219 | .bus_attrs = rbd_bus_attrs, | |
220 | }; | |
221 | ||
222 | static void rbd_root_dev_release(struct device *dev) | |
223 | { | |
224 | } | |
225 | ||
226 | static struct device rbd_root_dev = { | |
227 | .init_name = "rbd", | |
228 | .release = rbd_root_dev_release, | |
229 | }; | |
230 | ||
dfc5606d | 231 | |
dfc5606d YS |
232 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
233 | { | |
234 | return get_device(&rbd_dev->dev); | |
235 | } | |
236 | ||
237 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
238 | { | |
239 | put_device(&rbd_dev->dev); | |
240 | } | |
602adf40 | 241 | |
1fe5e993 | 242 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 243 | |
602adf40 YS |
244 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
245 | { | |
f0f8cef5 | 246 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 247 | |
602adf40 YS |
248 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
249 | return -EROFS; | |
250 | ||
340c7a2b AE |
251 | rbd_get_dev(rbd_dev); |
252 | set_device_ro(bdev, rbd_dev->read_only); | |
253 | ||
602adf40 YS |
254 | return 0; |
255 | } | |
256 | ||
dfc5606d YS |
257 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
258 | { | |
259 | struct rbd_device *rbd_dev = disk->private_data; | |
260 | ||
261 | rbd_put_dev(rbd_dev); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
602adf40 YS |
266 | static const struct block_device_operations rbd_bd_ops = { |
267 | .owner = THIS_MODULE, | |
268 | .open = rbd_open, | |
dfc5606d | 269 | .release = rbd_release, |
602adf40 YS |
270 | }; |
271 | ||
272 | /* | |
273 | * Initialize an rbd client instance. | |
43ae4701 | 274 | * We own *ceph_opts. |
602adf40 | 275 | */ |
f8c38929 | 276 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
277 | { |
278 | struct rbd_client *rbdc; | |
279 | int ret = -ENOMEM; | |
280 | ||
281 | dout("rbd_client_create\n"); | |
282 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
283 | if (!rbdc) | |
284 | goto out_opt; | |
285 | ||
286 | kref_init(&rbdc->kref); | |
287 | INIT_LIST_HEAD(&rbdc->node); | |
288 | ||
bc534d86 AE |
289 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
290 | ||
43ae4701 | 291 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 292 | if (IS_ERR(rbdc->client)) |
bc534d86 | 293 | goto out_mutex; |
43ae4701 | 294 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
295 | |
296 | ret = ceph_open_session(rbdc->client); | |
297 | if (ret < 0) | |
298 | goto out_err; | |
299 | ||
432b8587 | 300 | spin_lock(&rbd_client_list_lock); |
602adf40 | 301 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 302 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 303 | |
bc534d86 AE |
304 | mutex_unlock(&ctl_mutex); |
305 | ||
602adf40 YS |
306 | dout("rbd_client_create created %p\n", rbdc); |
307 | return rbdc; | |
308 | ||
309 | out_err: | |
310 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
311 | out_mutex: |
312 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
313 | kfree(rbdc); |
314 | out_opt: | |
43ae4701 AE |
315 | if (ceph_opts) |
316 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 317 | return ERR_PTR(ret); |
602adf40 YS |
318 | } |
319 | ||
320 | /* | |
1f7ba331 AE |
321 | * Find a ceph client with specific addr and configuration. If |
322 | * found, bump its reference count. | |
602adf40 | 323 | */ |
1f7ba331 | 324 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
325 | { |
326 | struct rbd_client *client_node; | |
1f7ba331 | 327 | bool found = false; |
602adf40 | 328 | |
43ae4701 | 329 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
330 | return NULL; |
331 | ||
1f7ba331 AE |
332 | spin_lock(&rbd_client_list_lock); |
333 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
334 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
335 | kref_get(&client_node->kref); | |
336 | found = true; | |
337 | break; | |
338 | } | |
339 | } | |
340 | spin_unlock(&rbd_client_list_lock); | |
341 | ||
342 | return found ? client_node : NULL; | |
602adf40 YS |
343 | } |
344 | ||
59c2be1e YS |
345 | /* |
346 | * mount options | |
347 | */ | |
348 | enum { | |
59c2be1e YS |
349 | Opt_last_int, |
350 | /* int args above */ | |
351 | Opt_last_string, | |
352 | /* string args above */ | |
cc0538b6 AE |
353 | Opt_read_only, |
354 | Opt_read_write, | |
355 | /* Boolean args above */ | |
356 | Opt_last_bool, | |
59c2be1e YS |
357 | }; |
358 | ||
43ae4701 | 359 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
360 | /* int args above */ |
361 | /* string args above */ | |
cc0538b6 AE |
362 | {Opt_read_only, "read_only"}, |
363 | {Opt_read_only, "ro"}, /* Alternate spelling */ | |
364 | {Opt_read_write, "read_write"}, | |
365 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
366 | /* Boolean args above */ | |
59c2be1e YS |
367 | {-1, NULL} |
368 | }; | |
369 | ||
370 | static int parse_rbd_opts_token(char *c, void *private) | |
371 | { | |
43ae4701 | 372 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
373 | substring_t argstr[MAX_OPT_ARGS]; |
374 | int token, intval, ret; | |
375 | ||
43ae4701 | 376 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
377 | if (token < 0) |
378 | return -EINVAL; | |
379 | ||
380 | if (token < Opt_last_int) { | |
381 | ret = match_int(&argstr[0], &intval); | |
382 | if (ret < 0) { | |
383 | pr_err("bad mount option arg (not int) " | |
384 | "at '%s'\n", c); | |
385 | return ret; | |
386 | } | |
387 | dout("got int token %d val %d\n", token, intval); | |
388 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
389 | dout("got string token %d val %s\n", token, | |
390 | argstr[0].from); | |
cc0538b6 AE |
391 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
392 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
393 | } else { |
394 | dout("got token %d\n", token); | |
395 | } | |
396 | ||
397 | switch (token) { | |
cc0538b6 AE |
398 | case Opt_read_only: |
399 | rbd_opts->read_only = true; | |
400 | break; | |
401 | case Opt_read_write: | |
402 | rbd_opts->read_only = false; | |
403 | break; | |
59c2be1e YS |
404 | default: |
405 | BUG_ON(token); | |
406 | } | |
407 | return 0; | |
408 | } | |
409 | ||
602adf40 YS |
410 | /* |
411 | * Get a ceph client with specific addr and configuration, if one does | |
412 | * not exist create it. | |
413 | */ | |
f8c38929 AE |
414 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
415 | size_t mon_addr_len, char *options) | |
602adf40 | 416 | { |
f8c38929 | 417 | struct rbd_options *rbd_opts = &rbd_dev->rbd_opts; |
43ae4701 | 418 | struct ceph_options *ceph_opts; |
f8c38929 | 419 | struct rbd_client *rbdc; |
59c2be1e | 420 | |
cc0538b6 | 421 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
602adf40 | 422 | |
43ae4701 AE |
423 | ceph_opts = ceph_parse_options(options, mon_addr, |
424 | mon_addr + mon_addr_len, | |
425 | parse_rbd_opts_token, rbd_opts); | |
f8c38929 AE |
426 | if (IS_ERR(ceph_opts)) |
427 | return PTR_ERR(ceph_opts); | |
602adf40 | 428 | |
1f7ba331 | 429 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 430 | if (rbdc) { |
602adf40 | 431 | /* using an existing client */ |
43ae4701 | 432 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
433 | } else { |
434 | rbdc = rbd_client_create(ceph_opts); | |
435 | if (IS_ERR(rbdc)) | |
436 | return PTR_ERR(rbdc); | |
602adf40 | 437 | } |
f8c38929 | 438 | rbd_dev->rbd_client = rbdc; |
602adf40 | 439 | |
f8c38929 | 440 | return 0; |
602adf40 YS |
441 | } |
442 | ||
443 | /* | |
444 | * Destroy ceph client | |
d23a4b3f | 445 | * |
432b8587 | 446 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
447 | */ |
448 | static void rbd_client_release(struct kref *kref) | |
449 | { | |
450 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
451 | ||
452 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 453 | spin_lock(&rbd_client_list_lock); |
602adf40 | 454 | list_del(&rbdc->node); |
cd9d9f5d | 455 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
456 | |
457 | ceph_destroy_client(rbdc->client); | |
458 | kfree(rbdc); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
463 | * it. | |
464 | */ | |
465 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
466 | { | |
467 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
468 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
469 | } |
470 | ||
1fec7093 YS |
471 | /* |
472 | * Destroy requests collection | |
473 | */ | |
474 | static void rbd_coll_release(struct kref *kref) | |
475 | { | |
476 | struct rbd_req_coll *coll = | |
477 | container_of(kref, struct rbd_req_coll, kref); | |
478 | ||
479 | dout("rbd_coll_release %p\n", coll); | |
480 | kfree(coll); | |
481 | } | |
602adf40 | 482 | |
8e94af8e AE |
483 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
484 | { | |
103a150f AE |
485 | size_t size; |
486 | u32 snap_count; | |
487 | ||
488 | /* The header has to start with the magic rbd header text */ | |
489 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
490 | return false; | |
491 | ||
492 | /* | |
493 | * The size of a snapshot header has to fit in a size_t, and | |
494 | * that limits the number of snapshots. | |
495 | */ | |
496 | snap_count = le32_to_cpu(ondisk->snap_count); | |
497 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
498 | if (snap_count > size / sizeof (__le64)) | |
499 | return false; | |
500 | ||
501 | /* | |
502 | * Not only that, but the size of the entire the snapshot | |
503 | * header must also be representable in a size_t. | |
504 | */ | |
505 | size -= snap_count * sizeof (__le64); | |
506 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
507 | return false; | |
508 | ||
509 | return true; | |
8e94af8e AE |
510 | } |
511 | ||
602adf40 YS |
512 | /* |
513 | * Create a new header structure, translate header format from the on-disk | |
514 | * header. | |
515 | */ | |
516 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 517 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 518 | { |
ccece235 | 519 | u32 snap_count; |
58c17b0e | 520 | size_t len; |
d2bb24e5 | 521 | size_t size; |
621901d6 | 522 | u32 i; |
602adf40 | 523 | |
6a52325f AE |
524 | memset(header, 0, sizeof (*header)); |
525 | ||
103a150f AE |
526 | snap_count = le32_to_cpu(ondisk->snap_count); |
527 | ||
58c17b0e AE |
528 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
529 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 530 | if (!header->object_prefix) |
602adf40 | 531 | return -ENOMEM; |
58c17b0e AE |
532 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
533 | header->object_prefix[len] = '\0'; | |
00f1f36f | 534 | |
602adf40 | 535 | if (snap_count) { |
f785cc1d AE |
536 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
537 | ||
621901d6 AE |
538 | /* Save a copy of the snapshot names */ |
539 | ||
f785cc1d AE |
540 | if (snap_names_len > (u64) SIZE_MAX) |
541 | return -EIO; | |
542 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 543 | if (!header->snap_names) |
6a52325f | 544 | goto out_err; |
f785cc1d AE |
545 | /* |
546 | * Note that rbd_dev_v1_header_read() guarantees | |
547 | * the ondisk buffer we're working with has | |
548 | * snap_names_len bytes beyond the end of the | |
549 | * snapshot id array, this memcpy() is safe. | |
550 | */ | |
551 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
552 | snap_names_len); | |
6a52325f | 553 | |
621901d6 AE |
554 | /* Record each snapshot's size */ |
555 | ||
d2bb24e5 AE |
556 | size = snap_count * sizeof (*header->snap_sizes); |
557 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 558 | if (!header->snap_sizes) |
6a52325f | 559 | goto out_err; |
621901d6 AE |
560 | for (i = 0; i < snap_count; i++) |
561 | header->snap_sizes[i] = | |
562 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 563 | } else { |
ccece235 | 564 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
565 | header->snap_names = NULL; |
566 | header->snap_sizes = NULL; | |
567 | } | |
849b4260 | 568 | |
602adf40 YS |
569 | header->image_size = le64_to_cpu(ondisk->image_size); |
570 | header->obj_order = ondisk->options.order; | |
571 | header->crypt_type = ondisk->options.crypt_type; | |
572 | header->comp_type = ondisk->options.comp_type; | |
6a52325f AE |
573 | header->total_snaps = snap_count; |
574 | ||
621901d6 AE |
575 | /* Allocate and fill in the snapshot context */ |
576 | ||
6a52325f AE |
577 | size = sizeof (struct ceph_snap_context); |
578 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
579 | header->snapc = kzalloc(size, GFP_KERNEL); | |
580 | if (!header->snapc) | |
581 | goto out_err; | |
602adf40 YS |
582 | |
583 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 584 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 585 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
586 | for (i = 0; i < snap_count; i++) |
587 | header->snapc->snaps[i] = | |
588 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
589 | |
590 | return 0; | |
591 | ||
6a52325f | 592 | out_err: |
849b4260 | 593 | kfree(header->snap_sizes); |
ccece235 | 594 | header->snap_sizes = NULL; |
602adf40 | 595 | kfree(header->snap_names); |
ccece235 | 596 | header->snap_names = NULL; |
6a52325f AE |
597 | kfree(header->object_prefix); |
598 | header->object_prefix = NULL; | |
ccece235 | 599 | |
00f1f36f | 600 | return -ENOMEM; |
602adf40 YS |
601 | } |
602 | ||
602adf40 YS |
603 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
604 | u64 *seq, u64 *size) | |
605 | { | |
606 | int i; | |
607 | char *p = header->snap_names; | |
608 | ||
00f1f36f AE |
609 | for (i = 0; i < header->total_snaps; i++) { |
610 | if (!strcmp(snap_name, p)) { | |
602adf40 | 611 | |
00f1f36f | 612 | /* Found it. Pass back its id and/or size */ |
602adf40 | 613 | |
00f1f36f AE |
614 | if (seq) |
615 | *seq = header->snapc->snaps[i]; | |
616 | if (size) | |
617 | *size = header->snap_sizes[i]; | |
618 | return i; | |
619 | } | |
620 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
621 | } | |
622 | return -ENOENT; | |
602adf40 YS |
623 | } |
624 | ||
0ce1a794 | 625 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 626 | { |
78dc447d | 627 | int ret; |
602adf40 | 628 | |
0ce1a794 | 629 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 630 | |
0ce1a794 | 631 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 632 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0ce1a794 | 633 | rbd_dev->snap_id = CEPH_NOSNAP; |
e88a36ec | 634 | rbd_dev->snap_exists = false; |
cc0538b6 | 635 | rbd_dev->read_only = rbd_dev->rbd_opts.read_only; |
602adf40 | 636 | if (size) |
78dc447d | 637 | *size = rbd_dev->header.image_size; |
602adf40 | 638 | } else { |
78dc447d AE |
639 | u64 snap_id = 0; |
640 | ||
641 | ret = snap_by_name(&rbd_dev->header, rbd_dev->snap_name, | |
642 | &snap_id, size); | |
602adf40 YS |
643 | if (ret < 0) |
644 | goto done; | |
78dc447d | 645 | rbd_dev->snap_id = snap_id; |
e88a36ec | 646 | rbd_dev->snap_exists = true; |
cc0538b6 | 647 | rbd_dev->read_only = true; /* No choice for snapshots */ |
602adf40 YS |
648 | } |
649 | ||
650 | ret = 0; | |
651 | done: | |
0ce1a794 | 652 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
653 | return ret; |
654 | } | |
655 | ||
656 | static void rbd_header_free(struct rbd_image_header *header) | |
657 | { | |
849b4260 | 658 | kfree(header->object_prefix); |
d78fd7ae | 659 | header->object_prefix = NULL; |
602adf40 | 660 | kfree(header->snap_sizes); |
d78fd7ae | 661 | header->snap_sizes = NULL; |
849b4260 | 662 | kfree(header->snap_names); |
d78fd7ae | 663 | header->snap_names = NULL; |
d1d25646 | 664 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 665 | header->snapc = NULL; |
602adf40 YS |
666 | } |
667 | ||
668 | /* | |
669 | * get the actual striped segment name, offset and length | |
670 | */ | |
671 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 672 | const char *object_prefix, |
602adf40 YS |
673 | u64 ofs, u64 len, |
674 | char *seg_name, u64 *segofs) | |
675 | { | |
676 | u64 seg = ofs >> header->obj_order; | |
677 | ||
678 | if (seg_name) | |
679 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 680 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
681 | |
682 | ofs = ofs & ((1 << header->obj_order) - 1); | |
683 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
684 | ||
685 | if (segofs) | |
686 | *segofs = ofs; | |
687 | ||
688 | return len; | |
689 | } | |
690 | ||
1fec7093 YS |
691 | static int rbd_get_num_segments(struct rbd_image_header *header, |
692 | u64 ofs, u64 len) | |
693 | { | |
694 | u64 start_seg = ofs >> header->obj_order; | |
695 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
696 | return end_seg - start_seg + 1; | |
697 | } | |
698 | ||
029bcbd8 JD |
699 | /* |
700 | * returns the size of an object in the image | |
701 | */ | |
702 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
703 | { | |
704 | return 1 << header->obj_order; | |
705 | } | |
706 | ||
602adf40 YS |
707 | /* |
708 | * bio helpers | |
709 | */ | |
710 | ||
711 | static void bio_chain_put(struct bio *chain) | |
712 | { | |
713 | struct bio *tmp; | |
714 | ||
715 | while (chain) { | |
716 | tmp = chain; | |
717 | chain = chain->bi_next; | |
718 | bio_put(tmp); | |
719 | } | |
720 | } | |
721 | ||
722 | /* | |
723 | * zeros a bio chain, starting at specific offset | |
724 | */ | |
725 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
726 | { | |
727 | struct bio_vec *bv; | |
728 | unsigned long flags; | |
729 | void *buf; | |
730 | int i; | |
731 | int pos = 0; | |
732 | ||
733 | while (chain) { | |
734 | bio_for_each_segment(bv, chain, i) { | |
735 | if (pos + bv->bv_len > start_ofs) { | |
736 | int remainder = max(start_ofs - pos, 0); | |
737 | buf = bvec_kmap_irq(bv, &flags); | |
738 | memset(buf + remainder, 0, | |
739 | bv->bv_len - remainder); | |
85b5aaa6 | 740 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
741 | } |
742 | pos += bv->bv_len; | |
743 | } | |
744 | ||
745 | chain = chain->bi_next; | |
746 | } | |
747 | } | |
748 | ||
749 | /* | |
750 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
751 | * might return a bio_pair that will need to be released. | |
752 | */ | |
753 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
754 | struct bio_pair **bp, | |
755 | int len, gfp_t gfpmask) | |
756 | { | |
757 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
758 | int total = 0; | |
759 | ||
760 | if (*bp) { | |
761 | bio_pair_release(*bp); | |
762 | *bp = NULL; | |
763 | } | |
764 | ||
765 | while (old_chain && (total < len)) { | |
766 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
767 | if (!tmp) | |
768 | goto err_out; | |
769 | ||
770 | if (total + old_chain->bi_size > len) { | |
771 | struct bio_pair *bp; | |
772 | ||
773 | /* | |
774 | * this split can only happen with a single paged bio, | |
775 | * split_bio will BUG_ON if this is not the case | |
776 | */ | |
777 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
778 | "bi_size=%u\n", |
779 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
780 | |
781 | /* split the bio. We'll release it either in the next | |
782 | call, or it will have to be released outside */ | |
593a9e7b | 783 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
784 | if (!bp) |
785 | goto err_out; | |
786 | ||
787 | __bio_clone(tmp, &bp->bio1); | |
788 | ||
789 | *next = &bp->bio2; | |
790 | } else { | |
791 | __bio_clone(tmp, old_chain); | |
792 | *next = old_chain->bi_next; | |
793 | } | |
794 | ||
795 | tmp->bi_bdev = NULL; | |
796 | gfpmask &= ~__GFP_WAIT; | |
797 | tmp->bi_next = NULL; | |
798 | ||
799 | if (!new_chain) { | |
800 | new_chain = tail = tmp; | |
801 | } else { | |
802 | tail->bi_next = tmp; | |
803 | tail = tmp; | |
804 | } | |
805 | old_chain = old_chain->bi_next; | |
806 | ||
807 | total += tmp->bi_size; | |
808 | } | |
809 | ||
810 | BUG_ON(total < len); | |
811 | ||
812 | if (tail) | |
813 | tail->bi_next = NULL; | |
814 | ||
815 | *old = old_chain; | |
816 | ||
817 | return new_chain; | |
818 | ||
819 | err_out: | |
820 | dout("bio_chain_clone with err\n"); | |
821 | bio_chain_put(new_chain); | |
822 | return NULL; | |
823 | } | |
824 | ||
825 | /* | |
826 | * helpers for osd request op vectors. | |
827 | */ | |
57cfc106 AE |
828 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
829 | int opcode, u32 payload_len) | |
602adf40 | 830 | { |
57cfc106 AE |
831 | struct ceph_osd_req_op *ops; |
832 | ||
833 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
834 | if (!ops) | |
835 | return NULL; | |
836 | ||
837 | ops[0].op = opcode; | |
838 | ||
602adf40 YS |
839 | /* |
840 | * op extent offset and length will be set later on | |
841 | * in calc_raw_layout() | |
842 | */ | |
57cfc106 AE |
843 | ops[0].payload_len = payload_len; |
844 | ||
845 | return ops; | |
602adf40 YS |
846 | } |
847 | ||
848 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
849 | { | |
850 | kfree(ops); | |
851 | } | |
852 | ||
1fec7093 YS |
853 | static void rbd_coll_end_req_index(struct request *rq, |
854 | struct rbd_req_coll *coll, | |
855 | int index, | |
856 | int ret, u64 len) | |
857 | { | |
858 | struct request_queue *q; | |
859 | int min, max, i; | |
860 | ||
bd919d45 AE |
861 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
862 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
863 | |
864 | if (!rq) | |
865 | return; | |
866 | ||
867 | if (!coll) { | |
868 | blk_end_request(rq, ret, len); | |
869 | return; | |
870 | } | |
871 | ||
872 | q = rq->q; | |
873 | ||
874 | spin_lock_irq(q->queue_lock); | |
875 | coll->status[index].done = 1; | |
876 | coll->status[index].rc = ret; | |
877 | coll->status[index].bytes = len; | |
878 | max = min = coll->num_done; | |
879 | while (max < coll->total && coll->status[max].done) | |
880 | max++; | |
881 | ||
882 | for (i = min; i<max; i++) { | |
883 | __blk_end_request(rq, coll->status[i].rc, | |
884 | coll->status[i].bytes); | |
885 | coll->num_done++; | |
886 | kref_put(&coll->kref, rbd_coll_release); | |
887 | } | |
888 | spin_unlock_irq(q->queue_lock); | |
889 | } | |
890 | ||
891 | static void rbd_coll_end_req(struct rbd_request *req, | |
892 | int ret, u64 len) | |
893 | { | |
894 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
895 | } | |
896 | ||
602adf40 YS |
897 | /* |
898 | * Send ceph osd request | |
899 | */ | |
900 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 901 | struct rbd_device *rbd_dev, |
602adf40 YS |
902 | struct ceph_snap_context *snapc, |
903 | u64 snapid, | |
aded07ea | 904 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
905 | struct bio *bio, |
906 | struct page **pages, | |
907 | int num_pages, | |
908 | int flags, | |
909 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
910 | struct rbd_req_coll *coll, |
911 | int coll_index, | |
602adf40 | 912 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
913 | struct ceph_msg *msg), |
914 | struct ceph_osd_request **linger_req, | |
915 | u64 *ver) | |
602adf40 YS |
916 | { |
917 | struct ceph_osd_request *req; | |
918 | struct ceph_file_layout *layout; | |
919 | int ret; | |
920 | u64 bno; | |
921 | struct timespec mtime = CURRENT_TIME; | |
922 | struct rbd_request *req_data; | |
923 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 924 | struct ceph_osd_client *osdc; |
602adf40 | 925 | |
602adf40 | 926 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
927 | if (!req_data) { |
928 | if (coll) | |
929 | rbd_coll_end_req_index(rq, coll, coll_index, | |
930 | -ENOMEM, len); | |
931 | return -ENOMEM; | |
932 | } | |
933 | ||
934 | if (coll) { | |
935 | req_data->coll = coll; | |
936 | req_data->coll_index = coll_index; | |
937 | } | |
602adf40 | 938 | |
bd919d45 AE |
939 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
940 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 941 | |
0ce1a794 | 942 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
943 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
944 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 945 | if (!req) { |
4ad12621 | 946 | ret = -ENOMEM; |
602adf40 YS |
947 | goto done_pages; |
948 | } | |
949 | ||
950 | req->r_callback = rbd_cb; | |
951 | ||
952 | req_data->rq = rq; | |
953 | req_data->bio = bio; | |
954 | req_data->pages = pages; | |
955 | req_data->len = len; | |
956 | ||
957 | req->r_priv = req_data; | |
958 | ||
959 | reqhead = req->r_request->front.iov_base; | |
960 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
961 | ||
aded07ea | 962 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
963 | req->r_oid_len = strlen(req->r_oid); |
964 | ||
965 | layout = &req->r_file_layout; | |
966 | memset(layout, 0, sizeof(*layout)); | |
967 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
968 | layout->fl_stripe_count = cpu_to_le32(1); | |
969 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 970 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
971 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
972 | req, ops); | |
602adf40 YS |
973 | |
974 | ceph_osdc_build_request(req, ofs, &len, | |
975 | ops, | |
976 | snapc, | |
977 | &mtime, | |
978 | req->r_oid, req->r_oid_len); | |
602adf40 | 979 | |
59c2be1e | 980 | if (linger_req) { |
1dbb4399 | 981 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
982 | *linger_req = req; |
983 | } | |
984 | ||
1dbb4399 | 985 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
986 | if (ret < 0) |
987 | goto done_err; | |
988 | ||
989 | if (!rbd_cb) { | |
1dbb4399 | 990 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
991 | if (ver) |
992 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
993 | dout("reassert_ver=%llu\n", |
994 | (unsigned long long) | |
995 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
996 | ceph_osdc_put_request(req); |
997 | } | |
998 | return ret; | |
999 | ||
1000 | done_err: | |
1001 | bio_chain_put(req_data->bio); | |
1002 | ceph_osdc_put_request(req); | |
1003 | done_pages: | |
1fec7093 | 1004 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1005 | kfree(req_data); |
602adf40 YS |
1006 | return ret; |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Ceph osd op callback | |
1011 | */ | |
1012 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1013 | { | |
1014 | struct rbd_request *req_data = req->r_priv; | |
1015 | struct ceph_osd_reply_head *replyhead; | |
1016 | struct ceph_osd_op *op; | |
1017 | __s32 rc; | |
1018 | u64 bytes; | |
1019 | int read_op; | |
1020 | ||
1021 | /* parse reply */ | |
1022 | replyhead = msg->front.iov_base; | |
1023 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1024 | op = (void *)(replyhead + 1); | |
1025 | rc = le32_to_cpu(replyhead->result); | |
1026 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1027 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1028 | |
bd919d45 AE |
1029 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1030 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1031 | |
1032 | if (rc == -ENOENT && read_op) { | |
1033 | zero_bio_chain(req_data->bio, 0); | |
1034 | rc = 0; | |
1035 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1036 | zero_bio_chain(req_data->bio, bytes); | |
1037 | bytes = req_data->len; | |
1038 | } | |
1039 | ||
1fec7093 | 1040 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1041 | |
1042 | if (req_data->bio) | |
1043 | bio_chain_put(req_data->bio); | |
1044 | ||
1045 | ceph_osdc_put_request(req); | |
1046 | kfree(req_data); | |
1047 | } | |
1048 | ||
59c2be1e YS |
1049 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1050 | { | |
1051 | ceph_osdc_put_request(req); | |
1052 | } | |
1053 | ||
602adf40 YS |
1054 | /* |
1055 | * Do a synchronous ceph osd operation | |
1056 | */ | |
0ce1a794 | 1057 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1058 | struct ceph_snap_context *snapc, |
1059 | u64 snapid, | |
602adf40 | 1060 | int flags, |
913d2fdc | 1061 | struct ceph_osd_req_op *ops, |
aded07ea | 1062 | const char *object_name, |
602adf40 | 1063 | u64 ofs, u64 len, |
59c2be1e YS |
1064 | char *buf, |
1065 | struct ceph_osd_request **linger_req, | |
1066 | u64 *ver) | |
602adf40 YS |
1067 | { |
1068 | int ret; | |
1069 | struct page **pages; | |
1070 | int num_pages; | |
913d2fdc AE |
1071 | |
1072 | BUG_ON(ops == NULL); | |
602adf40 YS |
1073 | |
1074 | num_pages = calc_pages_for(ofs , len); | |
1075 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1076 | if (IS_ERR(pages)) |
1077 | return PTR_ERR(pages); | |
602adf40 | 1078 | |
0ce1a794 | 1079 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1080 | object_name, ofs, len, NULL, |
602adf40 YS |
1081 | pages, num_pages, |
1082 | flags, | |
1083 | ops, | |
1fec7093 | 1084 | NULL, 0, |
59c2be1e YS |
1085 | NULL, |
1086 | linger_req, ver); | |
602adf40 | 1087 | if (ret < 0) |
913d2fdc | 1088 | goto done; |
602adf40 YS |
1089 | |
1090 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1091 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1092 | ||
602adf40 YS |
1093 | done: |
1094 | ceph_release_page_vector(pages, num_pages); | |
1095 | return ret; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Do an asynchronous ceph osd operation | |
1100 | */ | |
1101 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1102 | struct rbd_device *rbd_dev, |
602adf40 YS |
1103 | struct ceph_snap_context *snapc, |
1104 | u64 snapid, | |
d1f57ea6 | 1105 | int opcode, int flags, |
602adf40 | 1106 | u64 ofs, u64 len, |
1fec7093 YS |
1107 | struct bio *bio, |
1108 | struct rbd_req_coll *coll, | |
1109 | int coll_index) | |
602adf40 YS |
1110 | { |
1111 | char *seg_name; | |
1112 | u64 seg_ofs; | |
1113 | u64 seg_len; | |
1114 | int ret; | |
1115 | struct ceph_osd_req_op *ops; | |
1116 | u32 payload_len; | |
1117 | ||
1118 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1119 | if (!seg_name) | |
1120 | return -ENOMEM; | |
1121 | ||
1122 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1123 | rbd_dev->header.object_prefix, |
602adf40 YS |
1124 | ofs, len, |
1125 | seg_name, &seg_ofs); | |
602adf40 YS |
1126 | |
1127 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1128 | ||
57cfc106 AE |
1129 | ret = -ENOMEM; |
1130 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1131 | if (!ops) | |
602adf40 YS |
1132 | goto done; |
1133 | ||
1134 | /* we've taken care of segment sizes earlier when we | |
1135 | cloned the bios. We should never have a segment | |
1136 | truncated at this point */ | |
1137 | BUG_ON(seg_len < len); | |
1138 | ||
1139 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1140 | seg_name, seg_ofs, seg_len, | |
1141 | bio, | |
1142 | NULL, 0, | |
1143 | flags, | |
1144 | ops, | |
1fec7093 | 1145 | coll, coll_index, |
59c2be1e | 1146 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1147 | |
1148 | rbd_destroy_ops(ops); | |
602adf40 YS |
1149 | done: |
1150 | kfree(seg_name); | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Request async osd write | |
1156 | */ | |
1157 | static int rbd_req_write(struct request *rq, | |
1158 | struct rbd_device *rbd_dev, | |
1159 | struct ceph_snap_context *snapc, | |
1160 | u64 ofs, u64 len, | |
1fec7093 YS |
1161 | struct bio *bio, |
1162 | struct rbd_req_coll *coll, | |
1163 | int coll_index) | |
602adf40 YS |
1164 | { |
1165 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1166 | CEPH_OSD_OP_WRITE, | |
1167 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1168 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1169 | } |
1170 | ||
1171 | /* | |
1172 | * Request async osd read | |
1173 | */ | |
1174 | static int rbd_req_read(struct request *rq, | |
1175 | struct rbd_device *rbd_dev, | |
1176 | u64 snapid, | |
1177 | u64 ofs, u64 len, | |
1fec7093 YS |
1178 | struct bio *bio, |
1179 | struct rbd_req_coll *coll, | |
1180 | int coll_index) | |
602adf40 YS |
1181 | { |
1182 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1183 | snapid, |
602adf40 YS |
1184 | CEPH_OSD_OP_READ, |
1185 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1186 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1187 | } |
1188 | ||
1189 | /* | |
1190 | * Request sync osd read | |
1191 | */ | |
0ce1a794 | 1192 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1193 | u64 snapid, |
aded07ea | 1194 | const char *object_name, |
602adf40 | 1195 | u64 ofs, u64 len, |
59c2be1e YS |
1196 | char *buf, |
1197 | u64 *ver) | |
602adf40 | 1198 | { |
913d2fdc AE |
1199 | struct ceph_osd_req_op *ops; |
1200 | int ret; | |
1201 | ||
1202 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1203 | if (!ops) | |
1204 | return -ENOMEM; | |
1205 | ||
1206 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1207 | snapid, |
602adf40 | 1208 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1209 | ops, object_name, ofs, len, buf, NULL, ver); |
1210 | rbd_destroy_ops(ops); | |
1211 | ||
1212 | return ret; | |
602adf40 YS |
1213 | } |
1214 | ||
1215 | /* | |
59c2be1e YS |
1216 | * Request sync osd watch |
1217 | */ | |
0ce1a794 | 1218 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1219 | u64 ver, |
7f0a24d8 | 1220 | u64 notify_id) |
59c2be1e YS |
1221 | { |
1222 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1223 | int ret; |
1224 | ||
57cfc106 AE |
1225 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1226 | if (!ops) | |
1227 | return -ENOMEM; | |
59c2be1e | 1228 | |
a71b891b | 1229 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1230 | ops[0].watch.cookie = notify_id; |
1231 | ops[0].watch.flag = 0; | |
1232 | ||
0ce1a794 | 1233 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1234 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1235 | NULL, 0, |
59c2be1e YS |
1236 | CEPH_OSD_FLAG_READ, |
1237 | ops, | |
1fec7093 | 1238 | NULL, 0, |
59c2be1e YS |
1239 | rbd_simple_req_cb, 0, NULL); |
1240 | ||
1241 | rbd_destroy_ops(ops); | |
1242 | return ret; | |
1243 | } | |
1244 | ||
1245 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1246 | { | |
0ce1a794 | 1247 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1248 | u64 hver; |
13143d2d SW |
1249 | int rc; |
1250 | ||
0ce1a794 | 1251 | if (!rbd_dev) |
59c2be1e YS |
1252 | return; |
1253 | ||
bd919d45 AE |
1254 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1255 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1256 | (unsigned int) opcode); | |
1fe5e993 | 1257 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1258 | if (rc) |
f0f8cef5 | 1259 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1260 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1261 | |
7f0a24d8 | 1262 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1263 | } |
1264 | ||
1265 | /* | |
1266 | * Request sync osd watch | |
1267 | */ | |
0e6f322d | 1268 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1269 | { |
1270 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1271 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1272 | int ret; |
59c2be1e | 1273 | |
57cfc106 AE |
1274 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1275 | if (!ops) | |
1276 | return -ENOMEM; | |
59c2be1e YS |
1277 | |
1278 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1279 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1280 | if (ret < 0) |
1281 | goto fail; | |
1282 | ||
0e6f322d | 1283 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1284 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1285 | ops[0].watch.flag = 1; |
1286 | ||
0ce1a794 | 1287 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1288 | CEPH_NOSNAP, |
59c2be1e YS |
1289 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1290 | ops, | |
0e6f322d AE |
1291 | rbd_dev->header_name, |
1292 | 0, 0, NULL, | |
0ce1a794 | 1293 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1294 | |
1295 | if (ret < 0) | |
1296 | goto fail_event; | |
1297 | ||
1298 | rbd_destroy_ops(ops); | |
1299 | return 0; | |
1300 | ||
1301 | fail_event: | |
0ce1a794 AE |
1302 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1303 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1304 | fail: |
1305 | rbd_destroy_ops(ops); | |
1306 | return ret; | |
1307 | } | |
1308 | ||
79e3057c YS |
1309 | /* |
1310 | * Request sync osd unwatch | |
1311 | */ | |
070c633f | 1312 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1313 | { |
1314 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1315 | int ret; |
79e3057c | 1316 | |
57cfc106 AE |
1317 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1318 | if (!ops) | |
1319 | return -ENOMEM; | |
79e3057c YS |
1320 | |
1321 | ops[0].watch.ver = 0; | |
0ce1a794 | 1322 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1323 | ops[0].watch.flag = 0; |
1324 | ||
0ce1a794 | 1325 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1326 | CEPH_NOSNAP, |
79e3057c YS |
1327 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1328 | ops, | |
070c633f AE |
1329 | rbd_dev->header_name, |
1330 | 0, 0, NULL, NULL, NULL); | |
1331 | ||
79e3057c YS |
1332 | |
1333 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1334 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1335 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1336 | return ret; |
1337 | } | |
1338 | ||
59c2be1e | 1339 | struct rbd_notify_info { |
0ce1a794 | 1340 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1341 | }; |
1342 | ||
1343 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1344 | { | |
0ce1a794 AE |
1345 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1346 | if (!rbd_dev) | |
59c2be1e YS |
1347 | return; |
1348 | ||
bd919d45 AE |
1349 | dout("rbd_notify_cb %s notify_id=%llu opcode=%u\n", |
1350 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1351 | (unsigned int) opcode); | |
59c2be1e YS |
1352 | } |
1353 | ||
1354 | /* | |
1355 | * Request sync osd notify | |
1356 | */ | |
4cb16250 | 1357 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev) |
59c2be1e YS |
1358 | { |
1359 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1360 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1361 | struct ceph_osd_event *event; |
1362 | struct rbd_notify_info info; | |
1363 | int payload_len = sizeof(u32) + sizeof(u32); | |
1364 | int ret; | |
1365 | ||
57cfc106 AE |
1366 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len); |
1367 | if (!ops) | |
1368 | return -ENOMEM; | |
59c2be1e | 1369 | |
0ce1a794 | 1370 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1371 | |
1372 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1373 | (void *)&info, &event); | |
1374 | if (ret < 0) | |
1375 | goto fail; | |
1376 | ||
1377 | ops[0].watch.ver = 1; | |
1378 | ops[0].watch.flag = 1; | |
1379 | ops[0].watch.cookie = event->cookie; | |
1380 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1381 | ops[0].watch.timeout = 12; | |
1382 | ||
0ce1a794 | 1383 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1384 | CEPH_NOSNAP, |
59c2be1e YS |
1385 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1386 | ops, | |
4cb16250 AE |
1387 | rbd_dev->header_name, |
1388 | 0, 0, NULL, NULL, NULL); | |
59c2be1e YS |
1389 | if (ret < 0) |
1390 | goto fail_event; | |
1391 | ||
1392 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1393 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1394 | rbd_destroy_ops(ops); | |
1395 | return 0; | |
1396 | ||
1397 | fail_event: | |
1398 | ceph_osdc_cancel_event(event); | |
1399 | fail: | |
1400 | rbd_destroy_ops(ops); | |
1401 | return ret; | |
1402 | } | |
1403 | ||
602adf40 YS |
1404 | /* |
1405 | * Request sync osd read | |
1406 | */ | |
0ce1a794 | 1407 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1408 | const char *object_name, |
1409 | const char *class_name, | |
1410 | const char *method_name, | |
602adf40 | 1411 | const char *data, |
59c2be1e YS |
1412 | int len, |
1413 | u64 *ver) | |
602adf40 YS |
1414 | { |
1415 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1416 | int class_name_len = strlen(class_name); |
1417 | int method_name_len = strlen(method_name); | |
57cfc106 AE |
1418 | int ret; |
1419 | ||
1420 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, | |
aded07ea | 1421 | class_name_len + method_name_len + len); |
57cfc106 AE |
1422 | if (!ops) |
1423 | return -ENOMEM; | |
602adf40 | 1424 | |
aded07ea AE |
1425 | ops[0].cls.class_name = class_name; |
1426 | ops[0].cls.class_len = (__u8) class_name_len; | |
1427 | ops[0].cls.method_name = method_name; | |
1428 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 YS |
1429 | ops[0].cls.argc = 0; |
1430 | ops[0].cls.indata = data; | |
1431 | ops[0].cls.indata_len = len; | |
1432 | ||
0ce1a794 | 1433 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1434 | CEPH_NOSNAP, |
602adf40 YS |
1435 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1436 | ops, | |
d1f57ea6 | 1437 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1438 | |
1439 | rbd_destroy_ops(ops); | |
1440 | ||
1441 | dout("cls_exec returned %d\n", ret); | |
1442 | return ret; | |
1443 | } | |
1444 | ||
1fec7093 YS |
1445 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1446 | { | |
1447 | struct rbd_req_coll *coll = | |
1448 | kzalloc(sizeof(struct rbd_req_coll) + | |
1449 | sizeof(struct rbd_req_status) * num_reqs, | |
1450 | GFP_ATOMIC); | |
1451 | ||
1452 | if (!coll) | |
1453 | return NULL; | |
1454 | coll->total = num_reqs; | |
1455 | kref_init(&coll->kref); | |
1456 | return coll; | |
1457 | } | |
1458 | ||
602adf40 YS |
1459 | /* |
1460 | * block device queue callback | |
1461 | */ | |
1462 | static void rbd_rq_fn(struct request_queue *q) | |
1463 | { | |
1464 | struct rbd_device *rbd_dev = q->queuedata; | |
1465 | struct request *rq; | |
1466 | struct bio_pair *bp = NULL; | |
1467 | ||
00f1f36f | 1468 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1469 | struct bio *bio; |
1470 | struct bio *rq_bio, *next_bio = NULL; | |
1471 | bool do_write; | |
bd919d45 AE |
1472 | unsigned int size; |
1473 | u64 op_size = 0; | |
602adf40 | 1474 | u64 ofs; |
1fec7093 YS |
1475 | int num_segs, cur_seg = 0; |
1476 | struct rbd_req_coll *coll; | |
d1d25646 | 1477 | struct ceph_snap_context *snapc; |
602adf40 YS |
1478 | |
1479 | /* peek at request from block layer */ | |
1480 | if (!rq) | |
1481 | break; | |
1482 | ||
1483 | dout("fetched request\n"); | |
1484 | ||
1485 | /* filter out block requests we don't understand */ | |
1486 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1487 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1488 | continue; |
602adf40 YS |
1489 | } |
1490 | ||
1491 | /* deduce our operation (read, write) */ | |
1492 | do_write = (rq_data_dir(rq) == WRITE); | |
1493 | ||
1494 | size = blk_rq_bytes(rq); | |
593a9e7b | 1495 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 YS |
1496 | rq_bio = rq->bio; |
1497 | if (do_write && rbd_dev->read_only) { | |
1498 | __blk_end_request_all(rq, -EROFS); | |
00f1f36f | 1499 | continue; |
602adf40 YS |
1500 | } |
1501 | ||
1502 | spin_unlock_irq(q->queue_lock); | |
1503 | ||
d1d25646 | 1504 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1505 | |
d1d25646 | 1506 | if (rbd_dev->snap_id != CEPH_NOSNAP && !rbd_dev->snap_exists) { |
e88a36ec | 1507 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1508 | dout("request for non-existent snapshot"); |
1509 | spin_lock_irq(q->queue_lock); | |
1510 | __blk_end_request_all(rq, -ENXIO); | |
1511 | continue; | |
e88a36ec JD |
1512 | } |
1513 | ||
d1d25646 JD |
1514 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1515 | ||
1516 | up_read(&rbd_dev->header_rwsem); | |
1517 | ||
602adf40 YS |
1518 | dout("%s 0x%x bytes at 0x%llx\n", |
1519 | do_write ? "write" : "read", | |
bd919d45 | 1520 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1521 | |
1fec7093 YS |
1522 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1523 | coll = rbd_alloc_coll(num_segs); | |
1524 | if (!coll) { | |
1525 | spin_lock_irq(q->queue_lock); | |
1526 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1527 | ceph_put_snap_context(snapc); |
00f1f36f | 1528 | continue; |
1fec7093 YS |
1529 | } |
1530 | ||
602adf40 YS |
1531 | do { |
1532 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1533 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
602adf40 | 1534 | op_size = rbd_get_segment(&rbd_dev->header, |
ca1e49a6 | 1535 | rbd_dev->header.object_prefix, |
602adf40 YS |
1536 | ofs, size, |
1537 | NULL, NULL); | |
1fec7093 | 1538 | kref_get(&coll->kref); |
602adf40 YS |
1539 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1540 | op_size, GFP_ATOMIC); | |
1541 | if (!bio) { | |
1fec7093 YS |
1542 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1543 | -ENOMEM, op_size); | |
1544 | goto next_seg; | |
602adf40 YS |
1545 | } |
1546 | ||
1fec7093 | 1547 | |
602adf40 YS |
1548 | /* init OSD command: write or read */ |
1549 | if (do_write) | |
1550 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1551 | snapc, |
602adf40 | 1552 | ofs, |
1fec7093 YS |
1553 | op_size, bio, |
1554 | coll, cur_seg); | |
602adf40 YS |
1555 | else |
1556 | rbd_req_read(rq, rbd_dev, | |
77dfe99f | 1557 | rbd_dev->snap_id, |
602adf40 | 1558 | ofs, |
1fec7093 YS |
1559 | op_size, bio, |
1560 | coll, cur_seg); | |
602adf40 | 1561 | |
1fec7093 | 1562 | next_seg: |
602adf40 YS |
1563 | size -= op_size; |
1564 | ofs += op_size; | |
1565 | ||
1fec7093 | 1566 | cur_seg++; |
602adf40 YS |
1567 | rq_bio = next_bio; |
1568 | } while (size > 0); | |
1fec7093 | 1569 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1570 | |
1571 | if (bp) | |
1572 | bio_pair_release(bp); | |
602adf40 | 1573 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1574 | |
1575 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1576 | } |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1581 | * multiple osd objects. One exception would be with a single page bios, | |
1582 | * which we handle later at bio_chain_clone | |
1583 | */ | |
1584 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1585 | struct bio_vec *bvec) | |
1586 | { | |
1587 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1588 | unsigned int chunk_sectors; |
1589 | sector_t sector; | |
1590 | unsigned int bio_sectors; | |
602adf40 YS |
1591 | int max; |
1592 | ||
593a9e7b AE |
1593 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1594 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1595 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1596 | ||
602adf40 | 1597 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1598 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1599 | if (max < 0) |
1600 | max = 0; /* bio_add cannot handle a negative return */ | |
1601 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1602 | return bvec->bv_len; | |
1603 | return max; | |
1604 | } | |
1605 | ||
1606 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1607 | { | |
1608 | struct gendisk *disk = rbd_dev->disk; | |
1609 | ||
1610 | if (!disk) | |
1611 | return; | |
1612 | ||
1613 | rbd_header_free(&rbd_dev->header); | |
1614 | ||
1615 | if (disk->flags & GENHD_FL_UP) | |
1616 | del_gendisk(disk); | |
1617 | if (disk->queue) | |
1618 | blk_cleanup_queue(disk->queue); | |
1619 | put_disk(disk); | |
1620 | } | |
1621 | ||
1622 | /* | |
4156d998 AE |
1623 | * Read the complete header for the given rbd device. |
1624 | * | |
1625 | * Returns a pointer to a dynamically-allocated buffer containing | |
1626 | * the complete and validated header. Caller can pass the address | |
1627 | * of a variable that will be filled in with the version of the | |
1628 | * header object at the time it was read. | |
1629 | * | |
1630 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1631 | */ |
4156d998 AE |
1632 | static struct rbd_image_header_ondisk * |
1633 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1634 | { |
4156d998 | 1635 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1636 | u32 snap_count = 0; |
4156d998 AE |
1637 | u64 names_size = 0; |
1638 | u32 want_count; | |
1639 | int ret; | |
602adf40 | 1640 | |
00f1f36f | 1641 | /* |
4156d998 AE |
1642 | * The complete header will include an array of its 64-bit |
1643 | * snapshot ids, followed by the names of those snapshots as | |
1644 | * a contiguous block of NUL-terminated strings. Note that | |
1645 | * the number of snapshots could change by the time we read | |
1646 | * it in, in which case we re-read it. | |
00f1f36f | 1647 | */ |
4156d998 AE |
1648 | do { |
1649 | size_t size; | |
1650 | ||
1651 | kfree(ondisk); | |
1652 | ||
1653 | size = sizeof (*ondisk); | |
1654 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1655 | size += names_size; | |
1656 | ondisk = kmalloc(size, GFP_KERNEL); | |
1657 | if (!ondisk) | |
1658 | return ERR_PTR(-ENOMEM); | |
1659 | ||
1660 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1661 | rbd_dev->header_name, |
4156d998 AE |
1662 | 0, size, |
1663 | (char *) ondisk, version); | |
1664 | ||
1665 | if (ret < 0) | |
1666 | goto out_err; | |
1667 | if (WARN_ON((size_t) ret < size)) { | |
1668 | ret = -ENXIO; | |
1669 | pr_warning("short header read for image %s" | |
1670 | " (want %zd got %d)\n", | |
1671 | rbd_dev->image_name, size, ret); | |
1672 | goto out_err; | |
1673 | } | |
1674 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1675 | ret = -ENXIO; | |
1676 | pr_warning("invalid header for image %s\n", | |
1677 | rbd_dev->image_name); | |
1678 | goto out_err; | |
81e759fb | 1679 | } |
602adf40 | 1680 | |
4156d998 AE |
1681 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1682 | want_count = snap_count; | |
1683 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1684 | } while (snap_count != want_count); | |
00f1f36f | 1685 | |
4156d998 | 1686 | return ondisk; |
00f1f36f | 1687 | |
4156d998 AE |
1688 | out_err: |
1689 | kfree(ondisk); | |
1690 | ||
1691 | return ERR_PTR(ret); | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * reload the ondisk the header | |
1696 | */ | |
1697 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1698 | struct rbd_image_header *header) | |
1699 | { | |
1700 | struct rbd_image_header_ondisk *ondisk; | |
1701 | u64 ver = 0; | |
1702 | int ret; | |
602adf40 | 1703 | |
4156d998 AE |
1704 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1705 | if (IS_ERR(ondisk)) | |
1706 | return PTR_ERR(ondisk); | |
1707 | ret = rbd_header_from_disk(header, ondisk); | |
1708 | if (ret >= 0) | |
1709 | header->obj_version = ver; | |
1710 | kfree(ondisk); | |
1711 | ||
1712 | return ret; | |
602adf40 YS |
1713 | } |
1714 | ||
1715 | /* | |
1716 | * create a snapshot | |
1717 | */ | |
0ce1a794 | 1718 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, |
602adf40 YS |
1719 | const char *snap_name, |
1720 | gfp_t gfp_flags) | |
1721 | { | |
1722 | int name_len = strlen(snap_name); | |
1723 | u64 new_snapid; | |
1724 | int ret; | |
916d4d67 | 1725 | void *data, *p, *e; |
1dbb4399 | 1726 | struct ceph_mon_client *monc; |
602adf40 YS |
1727 | |
1728 | /* we should create a snapshot only if we're pointing at the head */ | |
0ce1a794 | 1729 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1730 | return -EINVAL; |
1731 | ||
0ce1a794 AE |
1732 | monc = &rbd_dev->rbd_client->client->monc; |
1733 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
bd919d45 | 1734 | dout("created snapid=%llu\n", (unsigned long long) new_snapid); |
602adf40 YS |
1735 | if (ret < 0) |
1736 | return ret; | |
1737 | ||
1738 | data = kmalloc(name_len + 16, gfp_flags); | |
1739 | if (!data) | |
1740 | return -ENOMEM; | |
1741 | ||
916d4d67 SW |
1742 | p = data; |
1743 | e = data + name_len + 16; | |
602adf40 | 1744 | |
916d4d67 SW |
1745 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1746 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1747 | |
0bed54dc | 1748 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1749 | "rbd", "snap_add", |
d67d4be5 | 1750 | data, p - data, NULL); |
602adf40 | 1751 | |
916d4d67 | 1752 | kfree(data); |
602adf40 | 1753 | |
505cbb9b | 1754 | return ret < 0 ? ret : 0; |
602adf40 YS |
1755 | bad: |
1756 | return -ERANGE; | |
1757 | } | |
1758 | ||
dfc5606d YS |
1759 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1760 | { | |
1761 | struct rbd_snap *snap; | |
a0593290 | 1762 | struct rbd_snap *next; |
dfc5606d | 1763 | |
a0593290 | 1764 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1765 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1766 | } |
1767 | ||
602adf40 YS |
1768 | /* |
1769 | * only read the first part of the ondisk header, without the snaps info | |
1770 | */ | |
b813623a | 1771 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1772 | { |
1773 | int ret; | |
1774 | struct rbd_image_header h; | |
602adf40 YS |
1775 | |
1776 | ret = rbd_read_header(rbd_dev, &h); | |
1777 | if (ret < 0) | |
1778 | return ret; | |
1779 | ||
a51aa0c0 JD |
1780 | down_write(&rbd_dev->header_rwsem); |
1781 | ||
9db4b3e3 | 1782 | /* resized? */ |
474ef7ce JD |
1783 | if (rbd_dev->snap_id == CEPH_NOSNAP) { |
1784 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1785 | ||
1786 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1787 | set_capacity(rbd_dev->disk, size); | |
1788 | } | |
9db4b3e3 | 1789 | |
849b4260 | 1790 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1791 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1792 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1793 | /* osd requests may still refer to snapc */ |
1794 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1795 | |
b813623a AE |
1796 | if (hver) |
1797 | *hver = h.obj_version; | |
a71b891b | 1798 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1799 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1800 | rbd_dev->header.total_snaps = h.total_snaps; |
1801 | rbd_dev->header.snapc = h.snapc; | |
1802 | rbd_dev->header.snap_names = h.snap_names; | |
1803 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1804 | /* Free the extra copy of the object prefix */ |
1805 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1806 | kfree(h.object_prefix); | |
1807 | ||
dfc5606d YS |
1808 | ret = __rbd_init_snaps_header(rbd_dev); |
1809 | ||
c666601a | 1810 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1811 | |
dfc5606d | 1812 | return ret; |
602adf40 YS |
1813 | } |
1814 | ||
1fe5e993 AE |
1815 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1816 | { | |
1817 | int ret; | |
1818 | ||
1819 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1820 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1821 | mutex_unlock(&ctl_mutex); | |
1822 | ||
1823 | return ret; | |
1824 | } | |
1825 | ||
602adf40 YS |
1826 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1827 | { | |
1828 | struct gendisk *disk; | |
1829 | struct request_queue *q; | |
1830 | int rc; | |
593a9e7b | 1831 | u64 segment_size; |
602adf40 YS |
1832 | u64 total_size = 0; |
1833 | ||
1834 | /* contact OSD, request size info about the object being mapped */ | |
1835 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1836 | if (rc) | |
1837 | return rc; | |
1838 | ||
dfc5606d YS |
1839 | /* no need to lock here, as rbd_dev is not registered yet */ |
1840 | rc = __rbd_init_snaps_header(rbd_dev); | |
1841 | if (rc) | |
1842 | return rc; | |
1843 | ||
cc9d734c | 1844 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1845 | if (rc) |
1846 | return rc; | |
1847 | ||
1848 | /* create gendisk info */ | |
1849 | rc = -ENOMEM; | |
1850 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1851 | if (!disk) | |
1852 | goto out; | |
1853 | ||
f0f8cef5 | 1854 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1855 | rbd_dev->dev_id); |
602adf40 YS |
1856 | disk->major = rbd_dev->major; |
1857 | disk->first_minor = 0; | |
1858 | disk->fops = &rbd_bd_ops; | |
1859 | disk->private_data = rbd_dev; | |
1860 | ||
1861 | /* init rq */ | |
1862 | rc = -ENOMEM; | |
1863 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1864 | if (!q) | |
1865 | goto out_disk; | |
029bcbd8 | 1866 | |
593a9e7b AE |
1867 | /* We use the default size, but let's be explicit about it. */ |
1868 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1869 | ||
029bcbd8 | 1870 | /* set io sizes to object size */ |
593a9e7b AE |
1871 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1872 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1873 | blk_queue_max_segment_size(q, segment_size); | |
1874 | blk_queue_io_min(q, segment_size); | |
1875 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1876 | |
602adf40 YS |
1877 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1878 | disk->queue = q; | |
1879 | ||
1880 | q->queuedata = rbd_dev; | |
1881 | ||
1882 | rbd_dev->disk = disk; | |
1883 | rbd_dev->q = q; | |
1884 | ||
1885 | /* finally, announce the disk to the world */ | |
593a9e7b | 1886 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1887 | add_disk(disk); |
1888 | ||
1889 | pr_info("%s: added with size 0x%llx\n", | |
1890 | disk->disk_name, (unsigned long long)total_size); | |
1891 | return 0; | |
1892 | ||
1893 | out_disk: | |
1894 | put_disk(disk); | |
1895 | out: | |
1896 | return rc; | |
1897 | } | |
1898 | ||
dfc5606d YS |
1899 | /* |
1900 | sysfs | |
1901 | */ | |
1902 | ||
593a9e7b AE |
1903 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1904 | { | |
1905 | return container_of(dev, struct rbd_device, dev); | |
1906 | } | |
1907 | ||
dfc5606d YS |
1908 | static ssize_t rbd_size_show(struct device *dev, |
1909 | struct device_attribute *attr, char *buf) | |
1910 | { | |
593a9e7b | 1911 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1912 | sector_t size; |
1913 | ||
1914 | down_read(&rbd_dev->header_rwsem); | |
1915 | size = get_capacity(rbd_dev->disk); | |
1916 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1917 | |
a51aa0c0 | 1918 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1919 | } |
1920 | ||
1921 | static ssize_t rbd_major_show(struct device *dev, | |
1922 | struct device_attribute *attr, char *buf) | |
1923 | { | |
593a9e7b | 1924 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1925 | |
dfc5606d YS |
1926 | return sprintf(buf, "%d\n", rbd_dev->major); |
1927 | } | |
1928 | ||
1929 | static ssize_t rbd_client_id_show(struct device *dev, | |
1930 | struct device_attribute *attr, char *buf) | |
602adf40 | 1931 | { |
593a9e7b | 1932 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1933 | |
1dbb4399 AE |
1934 | return sprintf(buf, "client%lld\n", |
1935 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1936 | } |
1937 | ||
dfc5606d YS |
1938 | static ssize_t rbd_pool_show(struct device *dev, |
1939 | struct device_attribute *attr, char *buf) | |
602adf40 | 1940 | { |
593a9e7b | 1941 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1942 | |
1943 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1944 | } | |
1945 | ||
9bb2f334 AE |
1946 | static ssize_t rbd_pool_id_show(struct device *dev, |
1947 | struct device_attribute *attr, char *buf) | |
1948 | { | |
1949 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1950 | ||
1951 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1952 | } | |
1953 | ||
dfc5606d YS |
1954 | static ssize_t rbd_name_show(struct device *dev, |
1955 | struct device_attribute *attr, char *buf) | |
1956 | { | |
593a9e7b | 1957 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1958 | |
0bed54dc | 1959 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1960 | } |
1961 | ||
1962 | static ssize_t rbd_snap_show(struct device *dev, | |
1963 | struct device_attribute *attr, | |
1964 | char *buf) | |
1965 | { | |
593a9e7b | 1966 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1967 | |
1968 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1969 | } | |
1970 | ||
1971 | static ssize_t rbd_image_refresh(struct device *dev, | |
1972 | struct device_attribute *attr, | |
1973 | const char *buf, | |
1974 | size_t size) | |
1975 | { | |
593a9e7b | 1976 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1977 | int ret; |
602adf40 | 1978 | |
1fe5e993 | 1979 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1980 | |
1981 | return ret < 0 ? ret : size; | |
dfc5606d | 1982 | } |
602adf40 | 1983 | |
dfc5606d YS |
1984 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1985 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1986 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1987 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1988 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1989 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1990 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1991 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1992 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1993 | |
1994 | static struct attribute *rbd_attrs[] = { | |
1995 | &dev_attr_size.attr, | |
1996 | &dev_attr_major.attr, | |
1997 | &dev_attr_client_id.attr, | |
1998 | &dev_attr_pool.attr, | |
9bb2f334 | 1999 | &dev_attr_pool_id.attr, |
dfc5606d YS |
2000 | &dev_attr_name.attr, |
2001 | &dev_attr_current_snap.attr, | |
2002 | &dev_attr_refresh.attr, | |
2003 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
2004 | NULL |
2005 | }; | |
2006 | ||
2007 | static struct attribute_group rbd_attr_group = { | |
2008 | .attrs = rbd_attrs, | |
2009 | }; | |
2010 | ||
2011 | static const struct attribute_group *rbd_attr_groups[] = { | |
2012 | &rbd_attr_group, | |
2013 | NULL | |
2014 | }; | |
2015 | ||
2016 | static void rbd_sysfs_dev_release(struct device *dev) | |
2017 | { | |
2018 | } | |
2019 | ||
2020 | static struct device_type rbd_device_type = { | |
2021 | .name = "rbd", | |
2022 | .groups = rbd_attr_groups, | |
2023 | .release = rbd_sysfs_dev_release, | |
2024 | }; | |
2025 | ||
2026 | ||
2027 | /* | |
2028 | sysfs - snapshots | |
2029 | */ | |
2030 | ||
2031 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2032 | struct device_attribute *attr, | |
2033 | char *buf) | |
2034 | { | |
2035 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2036 | ||
3591538f | 2037 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2038 | } |
2039 | ||
2040 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2041 | struct device_attribute *attr, | |
2042 | char *buf) | |
2043 | { | |
2044 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2045 | ||
3591538f | 2046 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2047 | } |
2048 | ||
2049 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
2050 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
2051 | ||
2052 | static struct attribute *rbd_snap_attrs[] = { | |
2053 | &dev_attr_snap_size.attr, | |
2054 | &dev_attr_snap_id.attr, | |
2055 | NULL, | |
2056 | }; | |
2057 | ||
2058 | static struct attribute_group rbd_snap_attr_group = { | |
2059 | .attrs = rbd_snap_attrs, | |
2060 | }; | |
2061 | ||
2062 | static void rbd_snap_dev_release(struct device *dev) | |
2063 | { | |
2064 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2065 | kfree(snap->name); | |
2066 | kfree(snap); | |
2067 | } | |
2068 | ||
2069 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2070 | &rbd_snap_attr_group, | |
2071 | NULL | |
2072 | }; | |
2073 | ||
2074 | static struct device_type rbd_snap_device_type = { | |
2075 | .groups = rbd_snap_attr_groups, | |
2076 | .release = rbd_snap_dev_release, | |
2077 | }; | |
2078 | ||
14e7085d | 2079 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2080 | { |
2081 | list_del(&snap->node); | |
2082 | device_unregister(&snap->dev); | |
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); | |
2095 | ret = device_register(dev); | |
2096 | ||
2097 | return ret; | |
2098 | } | |
2099 | ||
4e891e0a AE |
2100 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2101 | int i, const char *name) | |
dfc5606d | 2102 | { |
4e891e0a | 2103 | struct rbd_snap *snap; |
dfc5606d | 2104 | int ret; |
4e891e0a AE |
2105 | |
2106 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2107 | if (!snap) |
4e891e0a AE |
2108 | return ERR_PTR(-ENOMEM); |
2109 | ||
2110 | ret = -ENOMEM; | |
dfc5606d | 2111 | snap->name = kstrdup(name, GFP_KERNEL); |
4e891e0a AE |
2112 | if (!snap->name) |
2113 | goto err; | |
2114 | ||
dfc5606d YS |
2115 | snap->size = rbd_dev->header.snap_sizes[i]; |
2116 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2117 | if (device_is_registered(&rbd_dev->dev)) { | |
14e7085d | 2118 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d YS |
2119 | if (ret < 0) |
2120 | goto err; | |
2121 | } | |
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 | ||
2132 | /* | |
35938150 AE |
2133 | * Scan the rbd device's current snapshot list and compare it to the |
2134 | * newly-received snapshot context. Remove any existing snapshots | |
2135 | * not present in the new snapshot context. Add a new snapshot for | |
2136 | * any snaphots in the snapshot context not in the current list. | |
2137 | * And verify there are no changes to snapshots we already know | |
2138 | * about. | |
2139 | * | |
2140 | * Assumes the snapshots in the snapshot context are sorted by | |
2141 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2142 | * are also maintained in that order.) | |
dfc5606d YS |
2143 | */ |
2144 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2145 | { | |
35938150 AE |
2146 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2147 | const u32 snap_count = snapc->num_snaps; | |
2148 | char *snap_name = rbd_dev->header.snap_names; | |
2149 | struct list_head *head = &rbd_dev->snaps; | |
2150 | struct list_head *links = head->next; | |
2151 | u32 index = 0; | |
dfc5606d | 2152 | |
35938150 AE |
2153 | while (index < snap_count || links != head) { |
2154 | u64 snap_id; | |
2155 | struct rbd_snap *snap; | |
dfc5606d | 2156 | |
35938150 AE |
2157 | snap_id = index < snap_count ? snapc->snaps[index] |
2158 | : CEPH_NOSNAP; | |
2159 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2160 | : NULL; | |
2161 | BUG_ON(snap && snap->id == CEPH_NOSNAP); | |
dfc5606d | 2162 | |
35938150 AE |
2163 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2164 | struct list_head *next = links->next; | |
dfc5606d | 2165 | |
35938150 | 2166 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2167 | |
35938150 | 2168 | if (rbd_dev->snap_id == snap->id) |
e88a36ec | 2169 | rbd_dev->snap_exists = false; |
35938150 AE |
2170 | __rbd_remove_snap_dev(snap); |
2171 | ||
2172 | /* Done with this list entry; advance */ | |
2173 | ||
2174 | links = next; | |
dfc5606d YS |
2175 | continue; |
2176 | } | |
35938150 AE |
2177 | |
2178 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { | |
2179 | struct rbd_snap *new_snap; | |
2180 | ||
2181 | /* We haven't seen this snapshot before */ | |
2182 | ||
2183 | new_snap = __rbd_add_snap_dev(rbd_dev, index, | |
2184 | snap_name); | |
2185 | if (IS_ERR(new_snap)) | |
2186 | return PTR_ERR(new_snap); | |
2187 | ||
2188 | /* New goes before existing, or at end of list */ | |
2189 | ||
2190 | if (snap) | |
2191 | list_add_tail(&new_snap->node, &snap->node); | |
2192 | else | |
523f3258 | 2193 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2194 | } else { |
2195 | /* Already have this one */ | |
2196 | ||
2197 | BUG_ON(snap->size != rbd_dev->header.snap_sizes[index]); | |
2198 | BUG_ON(strcmp(snap->name, snap_name)); | |
2199 | ||
2200 | /* Done with this list entry; advance */ | |
2201 | ||
2202 | links = links->next; | |
dfc5606d | 2203 | } |
35938150 AE |
2204 | |
2205 | /* Advance to the next entry in the snapshot context */ | |
2206 | ||
2207 | index++; | |
2208 | snap_name += strlen(snap_name) + 1; | |
dfc5606d YS |
2209 | } |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
dfc5606d YS |
2214 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2215 | { | |
f0f8cef5 | 2216 | int ret; |
dfc5606d YS |
2217 | struct device *dev; |
2218 | struct rbd_snap *snap; | |
2219 | ||
2220 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2221 | dev = &rbd_dev->dev; | |
2222 | ||
2223 | dev->bus = &rbd_bus_type; | |
2224 | dev->type = &rbd_device_type; | |
2225 | dev->parent = &rbd_root_dev; | |
2226 | dev->release = rbd_dev_release; | |
de71a297 | 2227 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d YS |
2228 | ret = device_register(dev); |
2229 | if (ret < 0) | |
f0f8cef5 | 2230 | goto out; |
dfc5606d YS |
2231 | |
2232 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
14e7085d | 2233 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d | 2234 | if (ret < 0) |
602adf40 YS |
2235 | break; |
2236 | } | |
f0f8cef5 | 2237 | out: |
dfc5606d YS |
2238 | mutex_unlock(&ctl_mutex); |
2239 | return ret; | |
602adf40 YS |
2240 | } |
2241 | ||
dfc5606d YS |
2242 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2243 | { | |
2244 | device_unregister(&rbd_dev->dev); | |
2245 | } | |
2246 | ||
59c2be1e YS |
2247 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2248 | { | |
2249 | int ret, rc; | |
2250 | ||
2251 | do { | |
0e6f322d | 2252 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2253 | if (ret == -ERANGE) { |
1fe5e993 | 2254 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2255 | if (rc < 0) |
2256 | return rc; | |
2257 | } | |
2258 | } while (ret == -ERANGE); | |
2259 | ||
2260 | return ret; | |
2261 | } | |
2262 | ||
1ddbe94e AE |
2263 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2264 | ||
2265 | /* | |
499afd5b AE |
2266 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2267 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2268 | */ |
499afd5b | 2269 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2270 | { |
de71a297 | 2271 | rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max); |
499afd5b AE |
2272 | |
2273 | spin_lock(&rbd_dev_list_lock); | |
2274 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2275 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2276 | } |
b7f23c36 | 2277 | |
1ddbe94e | 2278 | /* |
499afd5b AE |
2279 | * Remove an rbd_dev from the global list, and record that its |
2280 | * identifier is no longer in use. | |
1ddbe94e | 2281 | */ |
499afd5b | 2282 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2283 | { |
d184f6bf | 2284 | struct list_head *tmp; |
de71a297 | 2285 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2286 | int max_id; |
2287 | ||
2288 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2289 | |
2290 | spin_lock(&rbd_dev_list_lock); | |
2291 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2292 | |
2293 | /* | |
2294 | * If the id being "put" is not the current maximum, there | |
2295 | * is nothing special we need to do. | |
2296 | */ | |
2297 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2298 | spin_unlock(&rbd_dev_list_lock); | |
2299 | return; | |
2300 | } | |
2301 | ||
2302 | /* | |
2303 | * We need to update the current maximum id. Search the | |
2304 | * list to find out what it is. We're more likely to find | |
2305 | * the maximum at the end, so search the list backward. | |
2306 | */ | |
2307 | max_id = 0; | |
2308 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2309 | struct rbd_device *rbd_dev; | |
2310 | ||
2311 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2312 | if (rbd_id > max_id) | |
2313 | max_id = rbd_id; | |
2314 | } | |
499afd5b | 2315 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2316 | |
1ddbe94e | 2317 | /* |
d184f6bf AE |
2318 | * The max id could have been updated by rbd_id_get(), in |
2319 | * which case it now accurately reflects the new maximum. | |
2320 | * Be careful not to overwrite the maximum value in that | |
2321 | * case. | |
1ddbe94e | 2322 | */ |
d184f6bf | 2323 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2324 | } |
2325 | ||
e28fff26 AE |
2326 | /* |
2327 | * Skips over white space at *buf, and updates *buf to point to the | |
2328 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2329 | * the token (string of non-white space characters) found. Note |
2330 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2331 | */ |
2332 | static inline size_t next_token(const char **buf) | |
2333 | { | |
2334 | /* | |
2335 | * These are the characters that produce nonzero for | |
2336 | * isspace() in the "C" and "POSIX" locales. | |
2337 | */ | |
2338 | const char *spaces = " \f\n\r\t\v"; | |
2339 | ||
2340 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2341 | ||
2342 | return strcspn(*buf, spaces); /* Return token length */ | |
2343 | } | |
2344 | ||
2345 | /* | |
2346 | * Finds the next token in *buf, and if the provided token buffer is | |
2347 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2348 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2349 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2350 | * |
2351 | * Returns the length of the token found (not including the '\0'). | |
2352 | * Return value will be 0 if no token is found, and it will be >= | |
2353 | * token_size if the token would not fit. | |
2354 | * | |
593a9e7b | 2355 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2356 | * found token. Note that this occurs even if the token buffer is |
2357 | * too small to hold it. | |
2358 | */ | |
2359 | static inline size_t copy_token(const char **buf, | |
2360 | char *token, | |
2361 | size_t token_size) | |
2362 | { | |
2363 | size_t len; | |
2364 | ||
2365 | len = next_token(buf); | |
2366 | if (len < token_size) { | |
2367 | memcpy(token, *buf, len); | |
2368 | *(token + len) = '\0'; | |
2369 | } | |
2370 | *buf += len; | |
2371 | ||
2372 | return len; | |
2373 | } | |
2374 | ||
ea3352f4 AE |
2375 | /* |
2376 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2377 | * enough to hold a copy of it, and copies the token into the new | |
2378 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2379 | * that a duplicate buffer is created even for a zero-length token. | |
2380 | * | |
2381 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2382 | * pointer if memory for the duplicate was not available. If | |
2383 | * the lenp argument is a non-null pointer, the length of the token | |
2384 | * (not including the '\0') is returned in *lenp. | |
2385 | * | |
2386 | * If successful, the *buf pointer will be updated to point beyond | |
2387 | * the end of the found token. | |
2388 | * | |
2389 | * Note: uses GFP_KERNEL for allocation. | |
2390 | */ | |
2391 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2392 | { | |
2393 | char *dup; | |
2394 | size_t len; | |
2395 | ||
2396 | len = next_token(buf); | |
2397 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2398 | if (!dup) | |
2399 | return NULL; | |
2400 | ||
2401 | memcpy(dup, *buf, len); | |
2402 | *(dup + len) = '\0'; | |
2403 | *buf += len; | |
2404 | ||
2405 | if (lenp) | |
2406 | *lenp = len; | |
2407 | ||
2408 | return dup; | |
2409 | } | |
2410 | ||
a725f65e | 2411 | /* |
0bed54dc | 2412 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2413 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2414 | * on the list of monitor addresses and other options provided via | |
2415 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2416 | * |
2417 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2418 | */ |
2419 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2420 | const char *buf, | |
7ef3214a | 2421 | const char **mon_addrs, |
5214ecc4 | 2422 | size_t *mon_addrs_size, |
e28fff26 | 2423 | char *options, |
0bed54dc | 2424 | size_t options_size) |
e28fff26 | 2425 | { |
d22f76e7 AE |
2426 | size_t len; |
2427 | int ret; | |
e28fff26 AE |
2428 | |
2429 | /* The first four tokens are required */ | |
2430 | ||
7ef3214a AE |
2431 | len = next_token(&buf); |
2432 | if (!len) | |
a725f65e | 2433 | return -EINVAL; |
5214ecc4 | 2434 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2435 | *mon_addrs = buf; |
2436 | ||
2437 | buf += len; | |
a725f65e | 2438 | |
e28fff26 AE |
2439 | len = copy_token(&buf, options, options_size); |
2440 | if (!len || len >= options_size) | |
2441 | return -EINVAL; | |
2442 | ||
bf3e5ae1 | 2443 | ret = -ENOMEM; |
d22f76e7 AE |
2444 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2445 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2446 | goto out_err; |
e28fff26 | 2447 | |
0bed54dc AE |
2448 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2449 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2450 | goto out_err; |
a725f65e | 2451 | |
cb8627c7 AE |
2452 | /* Create the name of the header object */ |
2453 | ||
0bed54dc | 2454 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2455 | + sizeof (RBD_SUFFIX), |
2456 | GFP_KERNEL); | |
0bed54dc | 2457 | if (!rbd_dev->header_name) |
cb8627c7 | 2458 | goto out_err; |
0bed54dc | 2459 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2460 | |
e28fff26 | 2461 | /* |
820a5f3e AE |
2462 | * The snapshot name is optional. If none is is supplied, |
2463 | * we use the default value. | |
e28fff26 | 2464 | */ |
820a5f3e AE |
2465 | rbd_dev->snap_name = dup_token(&buf, &len); |
2466 | if (!rbd_dev->snap_name) | |
2467 | goto out_err; | |
2468 | if (!len) { | |
2469 | /* Replace the empty name with the default */ | |
2470 | kfree(rbd_dev->snap_name); | |
2471 | rbd_dev->snap_name | |
2472 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2473 | if (!rbd_dev->snap_name) | |
2474 | goto out_err; | |
2475 | ||
e28fff26 AE |
2476 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
2477 | sizeof (RBD_SNAP_HEAD_NAME)); | |
849b4260 | 2478 | } |
e28fff26 | 2479 | |
a725f65e | 2480 | return 0; |
d22f76e7 AE |
2481 | |
2482 | out_err: | |
0bed54dc | 2483 | kfree(rbd_dev->header_name); |
d78fd7ae | 2484 | rbd_dev->header_name = NULL; |
0bed54dc | 2485 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2486 | rbd_dev->image_name = NULL; |
2487 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2488 | kfree(rbd_dev->pool_name); |
2489 | rbd_dev->pool_name = NULL; | |
2490 | ||
2491 | return ret; | |
a725f65e AE |
2492 | } |
2493 | ||
59c2be1e YS |
2494 | static ssize_t rbd_add(struct bus_type *bus, |
2495 | const char *buf, | |
2496 | size_t count) | |
602adf40 | 2497 | { |
cb8627c7 AE |
2498 | char *options; |
2499 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2500 | const char *mon_addrs = NULL; |
2501 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2502 | struct ceph_osd_client *osdc; |
2503 | int rc = -ENOMEM; | |
602adf40 YS |
2504 | |
2505 | if (!try_module_get(THIS_MODULE)) | |
2506 | return -ENODEV; | |
2507 | ||
60571c7d | 2508 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2509 | if (!options) |
27cc2594 | 2510 | goto err_nomem; |
cb8627c7 AE |
2511 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2512 | if (!rbd_dev) | |
2513 | goto err_nomem; | |
602adf40 YS |
2514 | |
2515 | /* static rbd_device initialization */ | |
2516 | spin_lock_init(&rbd_dev->lock); | |
2517 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2518 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2519 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2520 | |
d184f6bf | 2521 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2522 | rbd_id_get(rbd_dev); |
602adf40 | 2523 | |
a725f65e | 2524 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2525 | BUILD_BUG_ON(DEV_NAME_LEN |
2526 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
de71a297 | 2527 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
a725f65e | 2528 | |
602adf40 | 2529 | /* parse add command */ |
7ef3214a | 2530 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2531 | options, count); |
a725f65e | 2532 | if (rc) |
f0f8cef5 | 2533 | goto err_put_id; |
e124a82f | 2534 | |
f8c38929 AE |
2535 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
2536 | if (rc < 0) | |
f0f8cef5 | 2537 | goto err_put_id; |
602adf40 | 2538 | |
602adf40 | 2539 | /* pick the pool */ |
1dbb4399 | 2540 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2541 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2542 | if (rc < 0) | |
2543 | goto err_out_client; | |
9bb2f334 | 2544 | rbd_dev->pool_id = rc; |
602adf40 YS |
2545 | |
2546 | /* register our block device */ | |
27cc2594 AE |
2547 | rc = register_blkdev(0, rbd_dev->name); |
2548 | if (rc < 0) | |
602adf40 | 2549 | goto err_out_client; |
27cc2594 | 2550 | rbd_dev->major = rc; |
602adf40 | 2551 | |
dfc5606d YS |
2552 | rc = rbd_bus_add_dev(rbd_dev); |
2553 | if (rc) | |
766fc439 YS |
2554 | goto err_out_blkdev; |
2555 | ||
32eec68d AE |
2556 | /* |
2557 | * At this point cleanup in the event of an error is the job | |
2558 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2559 | * | |
2560 | * Set up and announce blkdev mapping. | |
2561 | */ | |
602adf40 YS |
2562 | rc = rbd_init_disk(rbd_dev); |
2563 | if (rc) | |
766fc439 | 2564 | goto err_out_bus; |
602adf40 | 2565 | |
59c2be1e YS |
2566 | rc = rbd_init_watch_dev(rbd_dev); |
2567 | if (rc) | |
2568 | goto err_out_bus; | |
2569 | ||
602adf40 YS |
2570 | return count; |
2571 | ||
766fc439 | 2572 | err_out_bus: |
766fc439 YS |
2573 | /* this will also clean up rest of rbd_dev stuff */ |
2574 | ||
2575 | rbd_bus_del_dev(rbd_dev); | |
2576 | kfree(options); | |
766fc439 YS |
2577 | return rc; |
2578 | ||
602adf40 YS |
2579 | err_out_blkdev: |
2580 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2581 | err_out_client: | |
2582 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2583 | err_put_id: |
cb8627c7 | 2584 | if (rbd_dev->pool_name) { |
820a5f3e | 2585 | kfree(rbd_dev->snap_name); |
0bed54dc AE |
2586 | kfree(rbd_dev->header_name); |
2587 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2588 | kfree(rbd_dev->pool_name); |
2589 | } | |
499afd5b | 2590 | rbd_id_put(rbd_dev); |
27cc2594 | 2591 | err_nomem: |
27cc2594 | 2592 | kfree(rbd_dev); |
cb8627c7 | 2593 | kfree(options); |
27cc2594 | 2594 | |
602adf40 YS |
2595 | dout("Error adding device %s\n", buf); |
2596 | module_put(THIS_MODULE); | |
27cc2594 AE |
2597 | |
2598 | return (ssize_t) rc; | |
602adf40 YS |
2599 | } |
2600 | ||
de71a297 | 2601 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2602 | { |
2603 | struct list_head *tmp; | |
2604 | struct rbd_device *rbd_dev; | |
2605 | ||
e124a82f | 2606 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2607 | list_for_each(tmp, &rbd_dev_list) { |
2608 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2609 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2610 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2611 | return rbd_dev; |
e124a82f | 2612 | } |
602adf40 | 2613 | } |
e124a82f | 2614 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2615 | return NULL; |
2616 | } | |
2617 | ||
dfc5606d | 2618 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2619 | { |
593a9e7b | 2620 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2621 | |
1dbb4399 AE |
2622 | if (rbd_dev->watch_request) { |
2623 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2624 | ||
2625 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2626 | rbd_dev->watch_request); |
1dbb4399 | 2627 | } |
59c2be1e | 2628 | if (rbd_dev->watch_event) |
070c633f | 2629 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2630 | |
602adf40 YS |
2631 | rbd_put_client(rbd_dev); |
2632 | ||
2633 | /* clean up and free blkdev */ | |
2634 | rbd_free_disk(rbd_dev); | |
2635 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2636 | |
2637 | /* done with the id, and with the rbd_dev */ | |
820a5f3e | 2638 | kfree(rbd_dev->snap_name); |
0bed54dc | 2639 | kfree(rbd_dev->header_name); |
d22f76e7 | 2640 | kfree(rbd_dev->pool_name); |
0bed54dc | 2641 | kfree(rbd_dev->image_name); |
32eec68d | 2642 | rbd_id_put(rbd_dev); |
602adf40 YS |
2643 | kfree(rbd_dev); |
2644 | ||
2645 | /* release module ref */ | |
2646 | module_put(THIS_MODULE); | |
602adf40 YS |
2647 | } |
2648 | ||
dfc5606d YS |
2649 | static ssize_t rbd_remove(struct bus_type *bus, |
2650 | const char *buf, | |
2651 | size_t count) | |
602adf40 YS |
2652 | { |
2653 | struct rbd_device *rbd_dev = NULL; | |
2654 | int target_id, rc; | |
2655 | unsigned long ul; | |
2656 | int ret = count; | |
2657 | ||
2658 | rc = strict_strtoul(buf, 10, &ul); | |
2659 | if (rc) | |
2660 | return rc; | |
2661 | ||
2662 | /* convert to int; abort if we lost anything in the conversion */ | |
2663 | target_id = (int) ul; | |
2664 | if (target_id != ul) | |
2665 | return -EINVAL; | |
2666 | ||
2667 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2668 | ||
2669 | rbd_dev = __rbd_get_dev(target_id); | |
2670 | if (!rbd_dev) { | |
2671 | ret = -ENOENT; | |
2672 | goto done; | |
2673 | } | |
2674 | ||
dfc5606d YS |
2675 | __rbd_remove_all_snaps(rbd_dev); |
2676 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2677 | |
2678 | done: | |
2679 | mutex_unlock(&ctl_mutex); | |
2680 | return ret; | |
2681 | } | |
2682 | ||
dfc5606d YS |
2683 | static ssize_t rbd_snap_add(struct device *dev, |
2684 | struct device_attribute *attr, | |
2685 | const char *buf, | |
2686 | size_t count) | |
602adf40 | 2687 | { |
593a9e7b | 2688 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2689 | int ret; |
2690 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2691 | if (!name) |
2692 | return -ENOMEM; | |
2693 | ||
dfc5606d | 2694 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2695 | |
2696 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2697 | ||
602adf40 YS |
2698 | ret = rbd_header_add_snap(rbd_dev, |
2699 | name, GFP_KERNEL); | |
2700 | if (ret < 0) | |
59c2be1e | 2701 | goto err_unlock; |
602adf40 | 2702 | |
b813623a | 2703 | ret = __rbd_refresh_header(rbd_dev, NULL); |
602adf40 | 2704 | if (ret < 0) |
59c2be1e YS |
2705 | goto err_unlock; |
2706 | ||
2707 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2708 | trigger a watch callback that would need to get that mutex */ | |
2709 | mutex_unlock(&ctl_mutex); | |
2710 | ||
2711 | /* make a best effort, don't error if failed */ | |
4cb16250 | 2712 | rbd_req_sync_notify(rbd_dev); |
602adf40 YS |
2713 | |
2714 | ret = count; | |
59c2be1e YS |
2715 | kfree(name); |
2716 | return ret; | |
2717 | ||
2718 | err_unlock: | |
602adf40 | 2719 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2720 | kfree(name); |
2721 | return ret; | |
2722 | } | |
2723 | ||
602adf40 YS |
2724 | /* |
2725 | * create control files in sysfs | |
dfc5606d | 2726 | * /sys/bus/rbd/... |
602adf40 YS |
2727 | */ |
2728 | static int rbd_sysfs_init(void) | |
2729 | { | |
dfc5606d | 2730 | int ret; |
602adf40 | 2731 | |
fed4c143 | 2732 | ret = device_register(&rbd_root_dev); |
21079786 | 2733 | if (ret < 0) |
dfc5606d | 2734 | return ret; |
602adf40 | 2735 | |
fed4c143 AE |
2736 | ret = bus_register(&rbd_bus_type); |
2737 | if (ret < 0) | |
2738 | device_unregister(&rbd_root_dev); | |
602adf40 | 2739 | |
602adf40 YS |
2740 | return ret; |
2741 | } | |
2742 | ||
2743 | static void rbd_sysfs_cleanup(void) | |
2744 | { | |
dfc5606d | 2745 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2746 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2747 | } |
2748 | ||
2749 | int __init rbd_init(void) | |
2750 | { | |
2751 | int rc; | |
2752 | ||
2753 | rc = rbd_sysfs_init(); | |
2754 | if (rc) | |
2755 | return rc; | |
f0f8cef5 | 2756 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2757 | return 0; |
2758 | } | |
2759 | ||
2760 | void __exit rbd_exit(void) | |
2761 | { | |
2762 | rbd_sysfs_cleanup(); | |
2763 | } | |
2764 | ||
2765 | module_init(rbd_init); | |
2766 | module_exit(rbd_exit); | |
2767 | ||
2768 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2769 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2770 | MODULE_DESCRIPTION("rados block device"); | |
2771 | ||
2772 | /* following authorship retained from original osdblk.c */ | |
2773 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2774 | ||
2775 | MODULE_LICENSE("GPL"); |