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 | |
59c2be1e YS |
72 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
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; |
0f1d3f93 | 84 | u64 snap_names_len; |
602adf40 YS |
85 | u32 total_snaps; |
86 | ||
87 | char *snap_names; | |
88 | u64 *snap_sizes; | |
59c2be1e YS |
89 | |
90 | u64 obj_version; | |
91 | }; | |
92 | ||
93 | struct rbd_options { | |
94 | int notify_timeout; | |
602adf40 YS |
95 | }; |
96 | ||
97 | /* | |
f0f8cef5 | 98 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
99 | */ |
100 | struct rbd_client { | |
101 | struct ceph_client *client; | |
59c2be1e | 102 | struct rbd_options *rbd_opts; |
602adf40 YS |
103 | struct kref kref; |
104 | struct list_head node; | |
105 | }; | |
106 | ||
107 | /* | |
f0f8cef5 | 108 | * a request completion status |
602adf40 | 109 | */ |
1fec7093 YS |
110 | struct rbd_req_status { |
111 | int done; | |
112 | int rc; | |
113 | u64 bytes; | |
114 | }; | |
115 | ||
116 | /* | |
117 | * a collection of requests | |
118 | */ | |
119 | struct rbd_req_coll { | |
120 | int total; | |
121 | int num_done; | |
122 | struct kref kref; | |
123 | struct rbd_req_status status[0]; | |
602adf40 YS |
124 | }; |
125 | ||
f0f8cef5 AE |
126 | /* |
127 | * a single io request | |
128 | */ | |
129 | struct rbd_request { | |
130 | struct request *rq; /* blk layer request */ | |
131 | struct bio *bio; /* cloned bio */ | |
132 | struct page **pages; /* list of used pages */ | |
133 | u64 len; | |
134 | int coll_index; | |
135 | struct rbd_req_coll *coll; | |
136 | }; | |
137 | ||
dfc5606d YS |
138 | struct rbd_snap { |
139 | struct device dev; | |
140 | const char *name; | |
3591538f | 141 | u64 size; |
dfc5606d YS |
142 | struct list_head node; |
143 | u64 id; | |
144 | }; | |
145 | ||
602adf40 YS |
146 | /* |
147 | * a single device | |
148 | */ | |
149 | struct rbd_device { | |
de71a297 | 150 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
151 | |
152 | int major; /* blkdev assigned major */ | |
153 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
154 | struct request_queue *q; | |
155 | ||
602adf40 YS |
156 | struct rbd_client *rbd_client; |
157 | ||
158 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
159 | ||
160 | spinlock_t lock; /* queue lock */ | |
161 | ||
162 | struct rbd_image_header header; | |
0bed54dc AE |
163 | char *image_name; |
164 | size_t image_name_len; | |
165 | char *header_name; | |
d22f76e7 | 166 | char *pool_name; |
9bb2f334 | 167 | int pool_id; |
602adf40 | 168 | |
59c2be1e YS |
169 | struct ceph_osd_event *watch_event; |
170 | struct ceph_osd_request *watch_request; | |
171 | ||
c666601a JD |
172 | /* protects updating the header */ |
173 | struct rw_semaphore header_rwsem; | |
e88a36ec | 174 | /* name of the snapshot this device reads from */ |
820a5f3e | 175 | char *snap_name; |
e88a36ec | 176 | /* id of the snapshot this device reads from */ |
77dfe99f | 177 | u64 snap_id; /* current snapshot id */ |
e88a36ec JD |
178 | /* whether the snap_id this device reads from still exists */ |
179 | bool snap_exists; | |
180 | int read_only; | |
602adf40 YS |
181 | |
182 | struct list_head node; | |
dfc5606d YS |
183 | |
184 | /* list of snapshots */ | |
185 | struct list_head snaps; | |
186 | ||
187 | /* sysfs related */ | |
188 | struct device dev; | |
189 | }; | |
190 | ||
602adf40 | 191 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 192 | |
602adf40 | 193 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
194 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
195 | ||
432b8587 AE |
196 | static LIST_HEAD(rbd_client_list); /* clients */ |
197 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 198 | |
dfc5606d YS |
199 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
200 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
201 | static ssize_t rbd_snap_add(struct device *dev, |
202 | struct device_attribute *attr, | |
203 | const char *buf, | |
204 | size_t count); | |
14e7085d | 205 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 206 | |
f0f8cef5 AE |
207 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
208 | size_t count); | |
209 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
210 | size_t count); | |
211 | ||
212 | static struct bus_attribute rbd_bus_attrs[] = { | |
213 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
214 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
215 | __ATTR_NULL | |
216 | }; | |
217 | ||
218 | static struct bus_type rbd_bus_type = { | |
219 | .name = "rbd", | |
220 | .bus_attrs = rbd_bus_attrs, | |
221 | }; | |
222 | ||
223 | static void rbd_root_dev_release(struct device *dev) | |
224 | { | |
225 | } | |
226 | ||
227 | static struct device rbd_root_dev = { | |
228 | .init_name = "rbd", | |
229 | .release = rbd_root_dev_release, | |
230 | }; | |
231 | ||
dfc5606d | 232 | |
dfc5606d YS |
233 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
234 | { | |
235 | return get_device(&rbd_dev->dev); | |
236 | } | |
237 | ||
238 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
239 | { | |
240 | put_device(&rbd_dev->dev); | |
241 | } | |
602adf40 | 242 | |
1fe5e993 | 243 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 244 | |
602adf40 YS |
245 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
246 | { | |
f0f8cef5 | 247 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 248 | |
602adf40 YS |
249 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
250 | return -EROFS; | |
251 | ||
340c7a2b AE |
252 | rbd_get_dev(rbd_dev); |
253 | set_device_ro(bdev, rbd_dev->read_only); | |
254 | ||
602adf40 YS |
255 | return 0; |
256 | } | |
257 | ||
dfc5606d YS |
258 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
259 | { | |
260 | struct rbd_device *rbd_dev = disk->private_data; | |
261 | ||
262 | rbd_put_dev(rbd_dev); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
602adf40 YS |
267 | static const struct block_device_operations rbd_bd_ops = { |
268 | .owner = THIS_MODULE, | |
269 | .open = rbd_open, | |
dfc5606d | 270 | .release = rbd_release, |
602adf40 YS |
271 | }; |
272 | ||
273 | /* | |
274 | * Initialize an rbd client instance. | |
43ae4701 | 275 | * We own *ceph_opts. |
602adf40 | 276 | */ |
43ae4701 | 277 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts, |
59c2be1e | 278 | struct rbd_options *rbd_opts) |
602adf40 YS |
279 | { |
280 | struct rbd_client *rbdc; | |
281 | int ret = -ENOMEM; | |
282 | ||
283 | dout("rbd_client_create\n"); | |
284 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
285 | if (!rbdc) | |
286 | goto out_opt; | |
287 | ||
288 | kref_init(&rbdc->kref); | |
289 | INIT_LIST_HEAD(&rbdc->node); | |
290 | ||
bc534d86 AE |
291 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
292 | ||
43ae4701 | 293 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 294 | if (IS_ERR(rbdc->client)) |
bc534d86 | 295 | goto out_mutex; |
43ae4701 | 296 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
297 | |
298 | ret = ceph_open_session(rbdc->client); | |
299 | if (ret < 0) | |
300 | goto out_err; | |
301 | ||
59c2be1e YS |
302 | rbdc->rbd_opts = rbd_opts; |
303 | ||
432b8587 | 304 | spin_lock(&rbd_client_list_lock); |
602adf40 | 305 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 306 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 307 | |
bc534d86 AE |
308 | mutex_unlock(&ctl_mutex); |
309 | ||
602adf40 YS |
310 | dout("rbd_client_create created %p\n", rbdc); |
311 | return rbdc; | |
312 | ||
313 | out_err: | |
314 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
315 | out_mutex: |
316 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
317 | kfree(rbdc); |
318 | out_opt: | |
43ae4701 AE |
319 | if (ceph_opts) |
320 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 321 | return ERR_PTR(ret); |
602adf40 YS |
322 | } |
323 | ||
324 | /* | |
325 | * Find a ceph client with specific addr and configuration. | |
326 | */ | |
43ae4701 | 327 | static struct rbd_client *__rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
328 | { |
329 | struct rbd_client *client_node; | |
330 | ||
43ae4701 | 331 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
332 | return NULL; |
333 | ||
334 | list_for_each_entry(client_node, &rbd_client_list, node) | |
43ae4701 | 335 | if (!ceph_compare_options(ceph_opts, client_node->client)) |
602adf40 YS |
336 | return client_node; |
337 | return NULL; | |
338 | } | |
339 | ||
59c2be1e YS |
340 | /* |
341 | * mount options | |
342 | */ | |
343 | enum { | |
344 | Opt_notify_timeout, | |
345 | Opt_last_int, | |
346 | /* int args above */ | |
347 | Opt_last_string, | |
348 | /* string args above */ | |
349 | }; | |
350 | ||
43ae4701 | 351 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
352 | {Opt_notify_timeout, "notify_timeout=%d"}, |
353 | /* int args above */ | |
354 | /* string args above */ | |
355 | {-1, NULL} | |
356 | }; | |
357 | ||
358 | static int parse_rbd_opts_token(char *c, void *private) | |
359 | { | |
43ae4701 | 360 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
361 | substring_t argstr[MAX_OPT_ARGS]; |
362 | int token, intval, ret; | |
363 | ||
43ae4701 | 364 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
365 | if (token < 0) |
366 | return -EINVAL; | |
367 | ||
368 | if (token < Opt_last_int) { | |
369 | ret = match_int(&argstr[0], &intval); | |
370 | if (ret < 0) { | |
371 | pr_err("bad mount option arg (not int) " | |
372 | "at '%s'\n", c); | |
373 | return ret; | |
374 | } | |
375 | dout("got int token %d val %d\n", token, intval); | |
376 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
377 | dout("got string token %d val %s\n", token, | |
378 | argstr[0].from); | |
379 | } else { | |
380 | dout("got token %d\n", token); | |
381 | } | |
382 | ||
383 | switch (token) { | |
384 | case Opt_notify_timeout: | |
43ae4701 | 385 | rbd_opts->notify_timeout = intval; |
59c2be1e YS |
386 | break; |
387 | default: | |
388 | BUG_ON(token); | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
602adf40 YS |
393 | /* |
394 | * Get a ceph client with specific addr and configuration, if one does | |
395 | * not exist create it. | |
396 | */ | |
5214ecc4 AE |
397 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
398 | size_t mon_addr_len, | |
399 | char *options) | |
602adf40 YS |
400 | { |
401 | struct rbd_client *rbdc; | |
43ae4701 | 402 | struct ceph_options *ceph_opts; |
59c2be1e YS |
403 | struct rbd_options *rbd_opts; |
404 | ||
405 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
406 | if (!rbd_opts) | |
d720bcb0 | 407 | return ERR_PTR(-ENOMEM); |
59c2be1e YS |
408 | |
409 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 | 410 | |
43ae4701 AE |
411 | ceph_opts = ceph_parse_options(options, mon_addr, |
412 | mon_addr + mon_addr_len, | |
413 | parse_rbd_opts_token, rbd_opts); | |
414 | if (IS_ERR(ceph_opts)) { | |
d720bcb0 | 415 | kfree(rbd_opts); |
43ae4701 | 416 | return ERR_CAST(ceph_opts); |
ee57741c | 417 | } |
602adf40 | 418 | |
432b8587 | 419 | spin_lock(&rbd_client_list_lock); |
43ae4701 | 420 | rbdc = __rbd_client_find(ceph_opts); |
602adf40 | 421 | if (rbdc) { |
602adf40 YS |
422 | /* using an existing client */ |
423 | kref_get(&rbdc->kref); | |
432b8587 | 424 | spin_unlock(&rbd_client_list_lock); |
e6994d3d | 425 | |
43ae4701 | 426 | ceph_destroy_options(ceph_opts); |
e6994d3d AE |
427 | kfree(rbd_opts); |
428 | ||
d720bcb0 | 429 | return rbdc; |
602adf40 | 430 | } |
432b8587 | 431 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 432 | |
43ae4701 | 433 | rbdc = rbd_client_create(ceph_opts, rbd_opts); |
d97081b0 | 434 | |
d720bcb0 AE |
435 | if (IS_ERR(rbdc)) |
436 | kfree(rbd_opts); | |
602adf40 | 437 | |
d720bcb0 | 438 | return rbdc; |
602adf40 YS |
439 | } |
440 | ||
441 | /* | |
442 | * Destroy ceph client | |
d23a4b3f | 443 | * |
432b8587 | 444 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
445 | */ |
446 | static void rbd_client_release(struct kref *kref) | |
447 | { | |
448 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
449 | ||
450 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 451 | spin_lock(&rbd_client_list_lock); |
602adf40 | 452 | list_del(&rbdc->node); |
cd9d9f5d | 453 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
454 | |
455 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 456 | kfree(rbdc->rbd_opts); |
602adf40 YS |
457 | kfree(rbdc); |
458 | } | |
459 | ||
460 | /* | |
461 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
462 | * it. | |
463 | */ | |
464 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
465 | { | |
466 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
467 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
468 | } |
469 | ||
1fec7093 YS |
470 | /* |
471 | * Destroy requests collection | |
472 | */ | |
473 | static void rbd_coll_release(struct kref *kref) | |
474 | { | |
475 | struct rbd_req_coll *coll = | |
476 | container_of(kref, struct rbd_req_coll, kref); | |
477 | ||
478 | dout("rbd_coll_release %p\n", coll); | |
479 | kfree(coll); | |
480 | } | |
602adf40 | 481 | |
8e94af8e AE |
482 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
483 | { | |
103a150f AE |
484 | size_t size; |
485 | u32 snap_count; | |
486 | ||
487 | /* The header has to start with the magic rbd header text */ | |
488 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
489 | return false; | |
490 | ||
491 | /* | |
492 | * The size of a snapshot header has to fit in a size_t, and | |
493 | * that limits the number of snapshots. | |
494 | */ | |
495 | snap_count = le32_to_cpu(ondisk->snap_count); | |
496 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
497 | if (snap_count > size / sizeof (__le64)) | |
498 | return false; | |
499 | ||
500 | /* | |
501 | * Not only that, but the size of the entire the snapshot | |
502 | * header must also be representable in a size_t. | |
503 | */ | |
504 | size -= snap_count * sizeof (__le64); | |
505 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
506 | return false; | |
507 | ||
508 | return true; | |
8e94af8e AE |
509 | } |
510 | ||
602adf40 YS |
511 | /* |
512 | * Create a new header structure, translate header format from the on-disk | |
513 | * header. | |
514 | */ | |
515 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
516 | struct rbd_image_header_ondisk *ondisk, | |
ed63f4fd | 517 | u32 allocated_snaps) |
602adf40 | 518 | { |
ccece235 | 519 | u32 snap_count; |
d2bb24e5 | 520 | size_t size; |
602adf40 | 521 | |
8e94af8e | 522 | if (!rbd_dev_ondisk_valid(ondisk)) |
81e759fb | 523 | return -ENXIO; |
81e759fb | 524 | |
6a52325f AE |
525 | memset(header, 0, sizeof (*header)); |
526 | ||
103a150f AE |
527 | snap_count = le32_to_cpu(ondisk->snap_count); |
528 | ||
6a52325f AE |
529 | size = sizeof (ondisk->block_name) + 1; |
530 | header->object_prefix = kmalloc(size, GFP_KERNEL); | |
531 | if (!header->object_prefix) | |
602adf40 | 532 | return -ENOMEM; |
6a52325f AE |
533 | memcpy(header->object_prefix, ondisk->block_name, size - 1); |
534 | header->object_prefix[size - 1] = '\0'; | |
00f1f36f | 535 | |
602adf40 | 536 | if (snap_count) { |
ccece235 | 537 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
0f1d3f93 | 538 | BUG_ON(header->snap_names_len > (u64) SIZE_MAX); |
602adf40 | 539 | header->snap_names = kmalloc(header->snap_names_len, |
ed63f4fd | 540 | GFP_KERNEL); |
602adf40 | 541 | if (!header->snap_names) |
6a52325f AE |
542 | goto out_err; |
543 | ||
d2bb24e5 AE |
544 | size = snap_count * sizeof (*header->snap_sizes); |
545 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 546 | if (!header->snap_sizes) |
6a52325f | 547 | goto out_err; |
602adf40 | 548 | } else { |
ccece235 AE |
549 | WARN_ON(ondisk->snap_names_len); |
550 | header->snap_names_len = 0; | |
602adf40 YS |
551 | header->snap_names = NULL; |
552 | header->snap_sizes = NULL; | |
553 | } | |
849b4260 | 554 | |
602adf40 YS |
555 | header->image_size = le64_to_cpu(ondisk->image_size); |
556 | header->obj_order = ondisk->options.order; | |
557 | header->crypt_type = ondisk->options.crypt_type; | |
558 | header->comp_type = ondisk->options.comp_type; | |
6a52325f AE |
559 | header->total_snaps = snap_count; |
560 | ||
28cb775d AE |
561 | /* |
562 | * If the number of snapshot ids provided by the caller | |
563 | * doesn't match the number in the entire context there's | |
564 | * no point in going further. Caller will try again after | |
565 | * getting an updated snapshot context from the server. | |
566 | */ | |
567 | if (allocated_snaps != snap_count) | |
568 | return 0; | |
6a52325f AE |
569 | |
570 | size = sizeof (struct ceph_snap_context); | |
571 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
572 | header->snapc = kzalloc(size, GFP_KERNEL); | |
573 | if (!header->snapc) | |
574 | goto out_err; | |
602adf40 YS |
575 | |
576 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 577 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 578 | header->snapc->num_snaps = snap_count; |
602adf40 | 579 | |
28cb775d AE |
580 | /* Fill in the snapshot information */ |
581 | ||
582 | if (snap_count) { | |
583 | u32 i; | |
ccece235 | 584 | |
602adf40 YS |
585 | for (i = 0; i < snap_count; i++) { |
586 | header->snapc->snaps[i] = | |
587 | le64_to_cpu(ondisk->snaps[i].id); | |
588 | header->snap_sizes[i] = | |
589 | le64_to_cpu(ondisk->snaps[i].image_size); | |
590 | } | |
591 | ||
592 | /* copy snapshot names */ | |
ccece235 | 593 | memcpy(header->snap_names, &ondisk->snaps[snap_count], |
602adf40 YS |
594 | header->snap_names_len); |
595 | } | |
596 | ||
597 | return 0; | |
598 | ||
6a52325f | 599 | out_err: |
849b4260 | 600 | kfree(header->snap_sizes); |
ccece235 | 601 | header->snap_sizes = NULL; |
602adf40 | 602 | kfree(header->snap_names); |
ccece235 | 603 | header->snap_names = NULL; |
d78fd7ae | 604 | header->snap_names_len = 0; |
6a52325f AE |
605 | kfree(header->object_prefix); |
606 | header->object_prefix = NULL; | |
ccece235 | 607 | |
00f1f36f | 608 | return -ENOMEM; |
602adf40 YS |
609 | } |
610 | ||
602adf40 YS |
611 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
612 | u64 *seq, u64 *size) | |
613 | { | |
614 | int i; | |
615 | char *p = header->snap_names; | |
616 | ||
00f1f36f AE |
617 | for (i = 0; i < header->total_snaps; i++) { |
618 | if (!strcmp(snap_name, p)) { | |
602adf40 | 619 | |
00f1f36f | 620 | /* Found it. Pass back its id and/or size */ |
602adf40 | 621 | |
00f1f36f AE |
622 | if (seq) |
623 | *seq = header->snapc->snaps[i]; | |
624 | if (size) | |
625 | *size = header->snap_sizes[i]; | |
626 | return i; | |
627 | } | |
628 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
629 | } | |
630 | return -ENOENT; | |
602adf40 YS |
631 | } |
632 | ||
0ce1a794 | 633 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 634 | { |
78dc447d | 635 | int ret; |
602adf40 | 636 | |
0ce1a794 | 637 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 638 | |
0ce1a794 | 639 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 640 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0ce1a794 | 641 | rbd_dev->snap_id = CEPH_NOSNAP; |
e88a36ec | 642 | rbd_dev->snap_exists = false; |
0ce1a794 | 643 | rbd_dev->read_only = 0; |
602adf40 | 644 | if (size) |
78dc447d | 645 | *size = rbd_dev->header.image_size; |
602adf40 | 646 | } else { |
78dc447d AE |
647 | u64 snap_id = 0; |
648 | ||
649 | ret = snap_by_name(&rbd_dev->header, rbd_dev->snap_name, | |
650 | &snap_id, size); | |
602adf40 YS |
651 | if (ret < 0) |
652 | goto done; | |
78dc447d | 653 | rbd_dev->snap_id = snap_id; |
e88a36ec | 654 | rbd_dev->snap_exists = true; |
0ce1a794 | 655 | rbd_dev->read_only = 1; |
602adf40 YS |
656 | } |
657 | ||
658 | ret = 0; | |
659 | done: | |
0ce1a794 | 660 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
661 | return ret; |
662 | } | |
663 | ||
664 | static void rbd_header_free(struct rbd_image_header *header) | |
665 | { | |
849b4260 | 666 | kfree(header->object_prefix); |
d78fd7ae | 667 | header->object_prefix = NULL; |
602adf40 | 668 | kfree(header->snap_sizes); |
d78fd7ae | 669 | header->snap_sizes = NULL; |
849b4260 | 670 | kfree(header->snap_names); |
d78fd7ae AE |
671 | header->snap_names = NULL; |
672 | header->snap_names_len = 0; | |
d1d25646 | 673 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 674 | header->snapc = NULL; |
602adf40 YS |
675 | } |
676 | ||
677 | /* | |
678 | * get the actual striped segment name, offset and length | |
679 | */ | |
680 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 681 | const char *object_prefix, |
602adf40 YS |
682 | u64 ofs, u64 len, |
683 | char *seg_name, u64 *segofs) | |
684 | { | |
685 | u64 seg = ofs >> header->obj_order; | |
686 | ||
687 | if (seg_name) | |
688 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 689 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
690 | |
691 | ofs = ofs & ((1 << header->obj_order) - 1); | |
692 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
693 | ||
694 | if (segofs) | |
695 | *segofs = ofs; | |
696 | ||
697 | return len; | |
698 | } | |
699 | ||
1fec7093 YS |
700 | static int rbd_get_num_segments(struct rbd_image_header *header, |
701 | u64 ofs, u64 len) | |
702 | { | |
703 | u64 start_seg = ofs >> header->obj_order; | |
704 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
705 | return end_seg - start_seg + 1; | |
706 | } | |
707 | ||
029bcbd8 JD |
708 | /* |
709 | * returns the size of an object in the image | |
710 | */ | |
711 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
712 | { | |
713 | return 1 << header->obj_order; | |
714 | } | |
715 | ||
602adf40 YS |
716 | /* |
717 | * bio helpers | |
718 | */ | |
719 | ||
720 | static void bio_chain_put(struct bio *chain) | |
721 | { | |
722 | struct bio *tmp; | |
723 | ||
724 | while (chain) { | |
725 | tmp = chain; | |
726 | chain = chain->bi_next; | |
727 | bio_put(tmp); | |
728 | } | |
729 | } | |
730 | ||
731 | /* | |
732 | * zeros a bio chain, starting at specific offset | |
733 | */ | |
734 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
735 | { | |
736 | struct bio_vec *bv; | |
737 | unsigned long flags; | |
738 | void *buf; | |
739 | int i; | |
740 | int pos = 0; | |
741 | ||
742 | while (chain) { | |
743 | bio_for_each_segment(bv, chain, i) { | |
744 | if (pos + bv->bv_len > start_ofs) { | |
745 | int remainder = max(start_ofs - pos, 0); | |
746 | buf = bvec_kmap_irq(bv, &flags); | |
747 | memset(buf + remainder, 0, | |
748 | bv->bv_len - remainder); | |
85b5aaa6 | 749 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
750 | } |
751 | pos += bv->bv_len; | |
752 | } | |
753 | ||
754 | chain = chain->bi_next; | |
755 | } | |
756 | } | |
757 | ||
758 | /* | |
759 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
760 | * might return a bio_pair that will need to be released. | |
761 | */ | |
762 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
763 | struct bio_pair **bp, | |
764 | int len, gfp_t gfpmask) | |
765 | { | |
766 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
767 | int total = 0; | |
768 | ||
769 | if (*bp) { | |
770 | bio_pair_release(*bp); | |
771 | *bp = NULL; | |
772 | } | |
773 | ||
774 | while (old_chain && (total < len)) { | |
775 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
776 | if (!tmp) | |
777 | goto err_out; | |
778 | ||
779 | if (total + old_chain->bi_size > len) { | |
780 | struct bio_pair *bp; | |
781 | ||
782 | /* | |
783 | * this split can only happen with a single paged bio, | |
784 | * split_bio will BUG_ON if this is not the case | |
785 | */ | |
786 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
787 | "bi_size=%u\n", |
788 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
789 | |
790 | /* split the bio. We'll release it either in the next | |
791 | call, or it will have to be released outside */ | |
593a9e7b | 792 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
793 | if (!bp) |
794 | goto err_out; | |
795 | ||
796 | __bio_clone(tmp, &bp->bio1); | |
797 | ||
798 | *next = &bp->bio2; | |
799 | } else { | |
800 | __bio_clone(tmp, old_chain); | |
801 | *next = old_chain->bi_next; | |
802 | } | |
803 | ||
804 | tmp->bi_bdev = NULL; | |
805 | gfpmask &= ~__GFP_WAIT; | |
806 | tmp->bi_next = NULL; | |
807 | ||
808 | if (!new_chain) { | |
809 | new_chain = tail = tmp; | |
810 | } else { | |
811 | tail->bi_next = tmp; | |
812 | tail = tmp; | |
813 | } | |
814 | old_chain = old_chain->bi_next; | |
815 | ||
816 | total += tmp->bi_size; | |
817 | } | |
818 | ||
819 | BUG_ON(total < len); | |
820 | ||
821 | if (tail) | |
822 | tail->bi_next = NULL; | |
823 | ||
824 | *old = old_chain; | |
825 | ||
826 | return new_chain; | |
827 | ||
828 | err_out: | |
829 | dout("bio_chain_clone with err\n"); | |
830 | bio_chain_put(new_chain); | |
831 | return NULL; | |
832 | } | |
833 | ||
834 | /* | |
835 | * helpers for osd request op vectors. | |
836 | */ | |
57cfc106 AE |
837 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
838 | int opcode, u32 payload_len) | |
602adf40 | 839 | { |
57cfc106 AE |
840 | struct ceph_osd_req_op *ops; |
841 | ||
842 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
843 | if (!ops) | |
844 | return NULL; | |
845 | ||
846 | ops[0].op = opcode; | |
847 | ||
602adf40 YS |
848 | /* |
849 | * op extent offset and length will be set later on | |
850 | * in calc_raw_layout() | |
851 | */ | |
57cfc106 AE |
852 | ops[0].payload_len = payload_len; |
853 | ||
854 | return ops; | |
602adf40 YS |
855 | } |
856 | ||
857 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
858 | { | |
859 | kfree(ops); | |
860 | } | |
861 | ||
1fec7093 YS |
862 | static void rbd_coll_end_req_index(struct request *rq, |
863 | struct rbd_req_coll *coll, | |
864 | int index, | |
865 | int ret, u64 len) | |
866 | { | |
867 | struct request_queue *q; | |
868 | int min, max, i; | |
869 | ||
bd919d45 AE |
870 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
871 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
872 | |
873 | if (!rq) | |
874 | return; | |
875 | ||
876 | if (!coll) { | |
877 | blk_end_request(rq, ret, len); | |
878 | return; | |
879 | } | |
880 | ||
881 | q = rq->q; | |
882 | ||
883 | spin_lock_irq(q->queue_lock); | |
884 | coll->status[index].done = 1; | |
885 | coll->status[index].rc = ret; | |
886 | coll->status[index].bytes = len; | |
887 | max = min = coll->num_done; | |
888 | while (max < coll->total && coll->status[max].done) | |
889 | max++; | |
890 | ||
891 | for (i = min; i<max; i++) { | |
892 | __blk_end_request(rq, coll->status[i].rc, | |
893 | coll->status[i].bytes); | |
894 | coll->num_done++; | |
895 | kref_put(&coll->kref, rbd_coll_release); | |
896 | } | |
897 | spin_unlock_irq(q->queue_lock); | |
898 | } | |
899 | ||
900 | static void rbd_coll_end_req(struct rbd_request *req, | |
901 | int ret, u64 len) | |
902 | { | |
903 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
904 | } | |
905 | ||
602adf40 YS |
906 | /* |
907 | * Send ceph osd request | |
908 | */ | |
909 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 910 | struct rbd_device *rbd_dev, |
602adf40 YS |
911 | struct ceph_snap_context *snapc, |
912 | u64 snapid, | |
aded07ea | 913 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
914 | struct bio *bio, |
915 | struct page **pages, | |
916 | int num_pages, | |
917 | int flags, | |
918 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
919 | struct rbd_req_coll *coll, |
920 | int coll_index, | |
602adf40 | 921 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
922 | struct ceph_msg *msg), |
923 | struct ceph_osd_request **linger_req, | |
924 | u64 *ver) | |
602adf40 YS |
925 | { |
926 | struct ceph_osd_request *req; | |
927 | struct ceph_file_layout *layout; | |
928 | int ret; | |
929 | u64 bno; | |
930 | struct timespec mtime = CURRENT_TIME; | |
931 | struct rbd_request *req_data; | |
932 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 933 | struct ceph_osd_client *osdc; |
602adf40 | 934 | |
602adf40 | 935 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
936 | if (!req_data) { |
937 | if (coll) | |
938 | rbd_coll_end_req_index(rq, coll, coll_index, | |
939 | -ENOMEM, len); | |
940 | return -ENOMEM; | |
941 | } | |
942 | ||
943 | if (coll) { | |
944 | req_data->coll = coll; | |
945 | req_data->coll_index = coll_index; | |
946 | } | |
602adf40 | 947 | |
bd919d45 AE |
948 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
949 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 950 | |
0ce1a794 | 951 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
952 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
953 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 954 | if (!req) { |
4ad12621 | 955 | ret = -ENOMEM; |
602adf40 YS |
956 | goto done_pages; |
957 | } | |
958 | ||
959 | req->r_callback = rbd_cb; | |
960 | ||
961 | req_data->rq = rq; | |
962 | req_data->bio = bio; | |
963 | req_data->pages = pages; | |
964 | req_data->len = len; | |
965 | ||
966 | req->r_priv = req_data; | |
967 | ||
968 | reqhead = req->r_request->front.iov_base; | |
969 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
970 | ||
aded07ea | 971 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
972 | req->r_oid_len = strlen(req->r_oid); |
973 | ||
974 | layout = &req->r_file_layout; | |
975 | memset(layout, 0, sizeof(*layout)); | |
976 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
977 | layout->fl_stripe_count = cpu_to_le32(1); | |
978 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 979 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
980 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
981 | req, ops); | |
602adf40 YS |
982 | |
983 | ceph_osdc_build_request(req, ofs, &len, | |
984 | ops, | |
985 | snapc, | |
986 | &mtime, | |
987 | req->r_oid, req->r_oid_len); | |
602adf40 | 988 | |
59c2be1e | 989 | if (linger_req) { |
1dbb4399 | 990 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
991 | *linger_req = req; |
992 | } | |
993 | ||
1dbb4399 | 994 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
995 | if (ret < 0) |
996 | goto done_err; | |
997 | ||
998 | if (!rbd_cb) { | |
1dbb4399 | 999 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1000 | if (ver) |
1001 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1002 | dout("reassert_ver=%llu\n", |
1003 | (unsigned long long) | |
1004 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1005 | ceph_osdc_put_request(req); |
1006 | } | |
1007 | return ret; | |
1008 | ||
1009 | done_err: | |
1010 | bio_chain_put(req_data->bio); | |
1011 | ceph_osdc_put_request(req); | |
1012 | done_pages: | |
1fec7093 | 1013 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1014 | kfree(req_data); |
602adf40 YS |
1015 | return ret; |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * Ceph osd op callback | |
1020 | */ | |
1021 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1022 | { | |
1023 | struct rbd_request *req_data = req->r_priv; | |
1024 | struct ceph_osd_reply_head *replyhead; | |
1025 | struct ceph_osd_op *op; | |
1026 | __s32 rc; | |
1027 | u64 bytes; | |
1028 | int read_op; | |
1029 | ||
1030 | /* parse reply */ | |
1031 | replyhead = msg->front.iov_base; | |
1032 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1033 | op = (void *)(replyhead + 1); | |
1034 | rc = le32_to_cpu(replyhead->result); | |
1035 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1036 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1037 | |
bd919d45 AE |
1038 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1039 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1040 | |
1041 | if (rc == -ENOENT && read_op) { | |
1042 | zero_bio_chain(req_data->bio, 0); | |
1043 | rc = 0; | |
1044 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1045 | zero_bio_chain(req_data->bio, bytes); | |
1046 | bytes = req_data->len; | |
1047 | } | |
1048 | ||
1fec7093 | 1049 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1050 | |
1051 | if (req_data->bio) | |
1052 | bio_chain_put(req_data->bio); | |
1053 | ||
1054 | ceph_osdc_put_request(req); | |
1055 | kfree(req_data); | |
1056 | } | |
1057 | ||
59c2be1e YS |
1058 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1059 | { | |
1060 | ceph_osdc_put_request(req); | |
1061 | } | |
1062 | ||
602adf40 YS |
1063 | /* |
1064 | * Do a synchronous ceph osd operation | |
1065 | */ | |
0ce1a794 | 1066 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1067 | struct ceph_snap_context *snapc, |
1068 | u64 snapid, | |
602adf40 | 1069 | int flags, |
913d2fdc | 1070 | struct ceph_osd_req_op *ops, |
aded07ea | 1071 | const char *object_name, |
602adf40 | 1072 | u64 ofs, u64 len, |
59c2be1e YS |
1073 | char *buf, |
1074 | struct ceph_osd_request **linger_req, | |
1075 | u64 *ver) | |
602adf40 YS |
1076 | { |
1077 | int ret; | |
1078 | struct page **pages; | |
1079 | int num_pages; | |
913d2fdc AE |
1080 | |
1081 | BUG_ON(ops == NULL); | |
602adf40 YS |
1082 | |
1083 | num_pages = calc_pages_for(ofs , len); | |
1084 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1085 | if (IS_ERR(pages)) |
1086 | return PTR_ERR(pages); | |
602adf40 | 1087 | |
0ce1a794 | 1088 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1089 | object_name, ofs, len, NULL, |
602adf40 YS |
1090 | pages, num_pages, |
1091 | flags, | |
1092 | ops, | |
1fec7093 | 1093 | NULL, 0, |
59c2be1e YS |
1094 | NULL, |
1095 | linger_req, ver); | |
602adf40 | 1096 | if (ret < 0) |
913d2fdc | 1097 | goto done; |
602adf40 YS |
1098 | |
1099 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1100 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1101 | ||
602adf40 YS |
1102 | done: |
1103 | ceph_release_page_vector(pages, num_pages); | |
1104 | return ret; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Do an asynchronous ceph osd operation | |
1109 | */ | |
1110 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1111 | struct rbd_device *rbd_dev, |
602adf40 YS |
1112 | struct ceph_snap_context *snapc, |
1113 | u64 snapid, | |
d1f57ea6 | 1114 | int opcode, int flags, |
602adf40 | 1115 | u64 ofs, u64 len, |
1fec7093 YS |
1116 | struct bio *bio, |
1117 | struct rbd_req_coll *coll, | |
1118 | int coll_index) | |
602adf40 YS |
1119 | { |
1120 | char *seg_name; | |
1121 | u64 seg_ofs; | |
1122 | u64 seg_len; | |
1123 | int ret; | |
1124 | struct ceph_osd_req_op *ops; | |
1125 | u32 payload_len; | |
1126 | ||
1127 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1128 | if (!seg_name) | |
1129 | return -ENOMEM; | |
1130 | ||
1131 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1132 | rbd_dev->header.object_prefix, |
602adf40 YS |
1133 | ofs, len, |
1134 | seg_name, &seg_ofs); | |
602adf40 YS |
1135 | |
1136 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1137 | ||
57cfc106 AE |
1138 | ret = -ENOMEM; |
1139 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1140 | if (!ops) | |
602adf40 YS |
1141 | goto done; |
1142 | ||
1143 | /* we've taken care of segment sizes earlier when we | |
1144 | cloned the bios. We should never have a segment | |
1145 | truncated at this point */ | |
1146 | BUG_ON(seg_len < len); | |
1147 | ||
1148 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1149 | seg_name, seg_ofs, seg_len, | |
1150 | bio, | |
1151 | NULL, 0, | |
1152 | flags, | |
1153 | ops, | |
1fec7093 | 1154 | coll, coll_index, |
59c2be1e | 1155 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1156 | |
1157 | rbd_destroy_ops(ops); | |
602adf40 YS |
1158 | done: |
1159 | kfree(seg_name); | |
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Request async osd write | |
1165 | */ | |
1166 | static int rbd_req_write(struct request *rq, | |
1167 | struct rbd_device *rbd_dev, | |
1168 | struct ceph_snap_context *snapc, | |
1169 | u64 ofs, u64 len, | |
1fec7093 YS |
1170 | struct bio *bio, |
1171 | struct rbd_req_coll *coll, | |
1172 | int coll_index) | |
602adf40 YS |
1173 | { |
1174 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1175 | CEPH_OSD_OP_WRITE, | |
1176 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1177 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1178 | } |
1179 | ||
1180 | /* | |
1181 | * Request async osd read | |
1182 | */ | |
1183 | static int rbd_req_read(struct request *rq, | |
1184 | struct rbd_device *rbd_dev, | |
1185 | u64 snapid, | |
1186 | u64 ofs, u64 len, | |
1fec7093 YS |
1187 | struct bio *bio, |
1188 | struct rbd_req_coll *coll, | |
1189 | int coll_index) | |
602adf40 YS |
1190 | { |
1191 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1192 | snapid, |
602adf40 YS |
1193 | CEPH_OSD_OP_READ, |
1194 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1195 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1196 | } |
1197 | ||
1198 | /* | |
1199 | * Request sync osd read | |
1200 | */ | |
0ce1a794 | 1201 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1202 | u64 snapid, |
aded07ea | 1203 | const char *object_name, |
602adf40 | 1204 | u64 ofs, u64 len, |
59c2be1e YS |
1205 | char *buf, |
1206 | u64 *ver) | |
602adf40 | 1207 | { |
913d2fdc AE |
1208 | struct ceph_osd_req_op *ops; |
1209 | int ret; | |
1210 | ||
1211 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1212 | if (!ops) | |
1213 | return -ENOMEM; | |
1214 | ||
1215 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1216 | snapid, |
602adf40 | 1217 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1218 | ops, object_name, ofs, len, buf, NULL, ver); |
1219 | rbd_destroy_ops(ops); | |
1220 | ||
1221 | return ret; | |
602adf40 YS |
1222 | } |
1223 | ||
1224 | /* | |
59c2be1e YS |
1225 | * Request sync osd watch |
1226 | */ | |
0ce1a794 | 1227 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1228 | u64 ver, |
7f0a24d8 | 1229 | u64 notify_id) |
59c2be1e YS |
1230 | { |
1231 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1232 | int ret; |
1233 | ||
57cfc106 AE |
1234 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1235 | if (!ops) | |
1236 | return -ENOMEM; | |
59c2be1e | 1237 | |
a71b891b | 1238 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1239 | ops[0].watch.cookie = notify_id; |
1240 | ops[0].watch.flag = 0; | |
1241 | ||
0ce1a794 | 1242 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1243 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1244 | NULL, 0, |
59c2be1e YS |
1245 | CEPH_OSD_FLAG_READ, |
1246 | ops, | |
1fec7093 | 1247 | NULL, 0, |
59c2be1e YS |
1248 | rbd_simple_req_cb, 0, NULL); |
1249 | ||
1250 | rbd_destroy_ops(ops); | |
1251 | return ret; | |
1252 | } | |
1253 | ||
1254 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1255 | { | |
0ce1a794 | 1256 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1257 | u64 hver; |
13143d2d SW |
1258 | int rc; |
1259 | ||
0ce1a794 | 1260 | if (!rbd_dev) |
59c2be1e YS |
1261 | return; |
1262 | ||
bd919d45 AE |
1263 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1264 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1265 | (unsigned int) opcode); | |
1fe5e993 | 1266 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1267 | if (rc) |
f0f8cef5 | 1268 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1269 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1270 | |
7f0a24d8 | 1271 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1272 | } |
1273 | ||
1274 | /* | |
1275 | * Request sync osd watch | |
1276 | */ | |
0e6f322d | 1277 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1278 | { |
1279 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1280 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1281 | int ret; |
59c2be1e | 1282 | |
57cfc106 AE |
1283 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1284 | if (!ops) | |
1285 | return -ENOMEM; | |
59c2be1e YS |
1286 | |
1287 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1288 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1289 | if (ret < 0) |
1290 | goto fail; | |
1291 | ||
0e6f322d | 1292 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1293 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1294 | ops[0].watch.flag = 1; |
1295 | ||
0ce1a794 | 1296 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1297 | CEPH_NOSNAP, |
59c2be1e YS |
1298 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1299 | ops, | |
0e6f322d AE |
1300 | rbd_dev->header_name, |
1301 | 0, 0, NULL, | |
0ce1a794 | 1302 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1303 | |
1304 | if (ret < 0) | |
1305 | goto fail_event; | |
1306 | ||
1307 | rbd_destroy_ops(ops); | |
1308 | return 0; | |
1309 | ||
1310 | fail_event: | |
0ce1a794 AE |
1311 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1312 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1313 | fail: |
1314 | rbd_destroy_ops(ops); | |
1315 | return ret; | |
1316 | } | |
1317 | ||
79e3057c YS |
1318 | /* |
1319 | * Request sync osd unwatch | |
1320 | */ | |
070c633f | 1321 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1322 | { |
1323 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1324 | int ret; |
79e3057c | 1325 | |
57cfc106 AE |
1326 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1327 | if (!ops) | |
1328 | return -ENOMEM; | |
79e3057c YS |
1329 | |
1330 | ops[0].watch.ver = 0; | |
0ce1a794 | 1331 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1332 | ops[0].watch.flag = 0; |
1333 | ||
0ce1a794 | 1334 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1335 | CEPH_NOSNAP, |
79e3057c YS |
1336 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1337 | ops, | |
070c633f AE |
1338 | rbd_dev->header_name, |
1339 | 0, 0, NULL, NULL, NULL); | |
1340 | ||
79e3057c YS |
1341 | |
1342 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1343 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1344 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1345 | return ret; |
1346 | } | |
1347 | ||
59c2be1e | 1348 | struct rbd_notify_info { |
0ce1a794 | 1349 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1350 | }; |
1351 | ||
1352 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1353 | { | |
0ce1a794 AE |
1354 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1355 | if (!rbd_dev) | |
59c2be1e YS |
1356 | return; |
1357 | ||
bd919d45 AE |
1358 | dout("rbd_notify_cb %s notify_id=%llu opcode=%u\n", |
1359 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1360 | (unsigned int) opcode); | |
59c2be1e YS |
1361 | } |
1362 | ||
1363 | /* | |
1364 | * Request sync osd notify | |
1365 | */ | |
4cb16250 | 1366 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev) |
59c2be1e YS |
1367 | { |
1368 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1369 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1370 | struct ceph_osd_event *event; |
1371 | struct rbd_notify_info info; | |
1372 | int payload_len = sizeof(u32) + sizeof(u32); | |
1373 | int ret; | |
1374 | ||
57cfc106 AE |
1375 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len); |
1376 | if (!ops) | |
1377 | return -ENOMEM; | |
59c2be1e | 1378 | |
0ce1a794 | 1379 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1380 | |
1381 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1382 | (void *)&info, &event); | |
1383 | if (ret < 0) | |
1384 | goto fail; | |
1385 | ||
1386 | ops[0].watch.ver = 1; | |
1387 | ops[0].watch.flag = 1; | |
1388 | ops[0].watch.cookie = event->cookie; | |
1389 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1390 | ops[0].watch.timeout = 12; | |
1391 | ||
0ce1a794 | 1392 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1393 | CEPH_NOSNAP, |
59c2be1e YS |
1394 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1395 | ops, | |
4cb16250 AE |
1396 | rbd_dev->header_name, |
1397 | 0, 0, NULL, NULL, NULL); | |
59c2be1e YS |
1398 | if (ret < 0) |
1399 | goto fail_event; | |
1400 | ||
1401 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1402 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1403 | rbd_destroy_ops(ops); | |
1404 | return 0; | |
1405 | ||
1406 | fail_event: | |
1407 | ceph_osdc_cancel_event(event); | |
1408 | fail: | |
1409 | rbd_destroy_ops(ops); | |
1410 | return ret; | |
1411 | } | |
1412 | ||
602adf40 YS |
1413 | /* |
1414 | * Request sync osd read | |
1415 | */ | |
0ce1a794 | 1416 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1417 | const char *object_name, |
1418 | const char *class_name, | |
1419 | const char *method_name, | |
602adf40 | 1420 | const char *data, |
59c2be1e YS |
1421 | int len, |
1422 | u64 *ver) | |
602adf40 YS |
1423 | { |
1424 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1425 | int class_name_len = strlen(class_name); |
1426 | int method_name_len = strlen(method_name); | |
57cfc106 AE |
1427 | int ret; |
1428 | ||
1429 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, | |
aded07ea | 1430 | class_name_len + method_name_len + len); |
57cfc106 AE |
1431 | if (!ops) |
1432 | return -ENOMEM; | |
602adf40 | 1433 | |
aded07ea AE |
1434 | ops[0].cls.class_name = class_name; |
1435 | ops[0].cls.class_len = (__u8) class_name_len; | |
1436 | ops[0].cls.method_name = method_name; | |
1437 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 YS |
1438 | ops[0].cls.argc = 0; |
1439 | ops[0].cls.indata = data; | |
1440 | ops[0].cls.indata_len = len; | |
1441 | ||
0ce1a794 | 1442 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1443 | CEPH_NOSNAP, |
602adf40 YS |
1444 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1445 | ops, | |
d1f57ea6 | 1446 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1447 | |
1448 | rbd_destroy_ops(ops); | |
1449 | ||
1450 | dout("cls_exec returned %d\n", ret); | |
1451 | return ret; | |
1452 | } | |
1453 | ||
1fec7093 YS |
1454 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1455 | { | |
1456 | struct rbd_req_coll *coll = | |
1457 | kzalloc(sizeof(struct rbd_req_coll) + | |
1458 | sizeof(struct rbd_req_status) * num_reqs, | |
1459 | GFP_ATOMIC); | |
1460 | ||
1461 | if (!coll) | |
1462 | return NULL; | |
1463 | coll->total = num_reqs; | |
1464 | kref_init(&coll->kref); | |
1465 | return coll; | |
1466 | } | |
1467 | ||
602adf40 YS |
1468 | /* |
1469 | * block device queue callback | |
1470 | */ | |
1471 | static void rbd_rq_fn(struct request_queue *q) | |
1472 | { | |
1473 | struct rbd_device *rbd_dev = q->queuedata; | |
1474 | struct request *rq; | |
1475 | struct bio_pair *bp = NULL; | |
1476 | ||
00f1f36f | 1477 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1478 | struct bio *bio; |
1479 | struct bio *rq_bio, *next_bio = NULL; | |
1480 | bool do_write; | |
bd919d45 AE |
1481 | unsigned int size; |
1482 | u64 op_size = 0; | |
602adf40 | 1483 | u64 ofs; |
1fec7093 YS |
1484 | int num_segs, cur_seg = 0; |
1485 | struct rbd_req_coll *coll; | |
d1d25646 | 1486 | struct ceph_snap_context *snapc; |
602adf40 YS |
1487 | |
1488 | /* peek at request from block layer */ | |
1489 | if (!rq) | |
1490 | break; | |
1491 | ||
1492 | dout("fetched request\n"); | |
1493 | ||
1494 | /* filter out block requests we don't understand */ | |
1495 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1496 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1497 | continue; |
602adf40 YS |
1498 | } |
1499 | ||
1500 | /* deduce our operation (read, write) */ | |
1501 | do_write = (rq_data_dir(rq) == WRITE); | |
1502 | ||
1503 | size = blk_rq_bytes(rq); | |
593a9e7b | 1504 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 YS |
1505 | rq_bio = rq->bio; |
1506 | if (do_write && rbd_dev->read_only) { | |
1507 | __blk_end_request_all(rq, -EROFS); | |
00f1f36f | 1508 | continue; |
602adf40 YS |
1509 | } |
1510 | ||
1511 | spin_unlock_irq(q->queue_lock); | |
1512 | ||
d1d25646 | 1513 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1514 | |
d1d25646 | 1515 | if (rbd_dev->snap_id != CEPH_NOSNAP && !rbd_dev->snap_exists) { |
e88a36ec | 1516 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1517 | dout("request for non-existent snapshot"); |
1518 | spin_lock_irq(q->queue_lock); | |
1519 | __blk_end_request_all(rq, -ENXIO); | |
1520 | continue; | |
e88a36ec JD |
1521 | } |
1522 | ||
d1d25646 JD |
1523 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1524 | ||
1525 | up_read(&rbd_dev->header_rwsem); | |
1526 | ||
602adf40 YS |
1527 | dout("%s 0x%x bytes at 0x%llx\n", |
1528 | do_write ? "write" : "read", | |
bd919d45 | 1529 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1530 | |
1fec7093 YS |
1531 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1532 | coll = rbd_alloc_coll(num_segs); | |
1533 | if (!coll) { | |
1534 | spin_lock_irq(q->queue_lock); | |
1535 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1536 | ceph_put_snap_context(snapc); |
00f1f36f | 1537 | continue; |
1fec7093 YS |
1538 | } |
1539 | ||
602adf40 YS |
1540 | do { |
1541 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1542 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
602adf40 | 1543 | op_size = rbd_get_segment(&rbd_dev->header, |
ca1e49a6 | 1544 | rbd_dev->header.object_prefix, |
602adf40 YS |
1545 | ofs, size, |
1546 | NULL, NULL); | |
1fec7093 | 1547 | kref_get(&coll->kref); |
602adf40 YS |
1548 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1549 | op_size, GFP_ATOMIC); | |
1550 | if (!bio) { | |
1fec7093 YS |
1551 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1552 | -ENOMEM, op_size); | |
1553 | goto next_seg; | |
602adf40 YS |
1554 | } |
1555 | ||
1fec7093 | 1556 | |
602adf40 YS |
1557 | /* init OSD command: write or read */ |
1558 | if (do_write) | |
1559 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1560 | snapc, |
602adf40 | 1561 | ofs, |
1fec7093 YS |
1562 | op_size, bio, |
1563 | coll, cur_seg); | |
602adf40 YS |
1564 | else |
1565 | rbd_req_read(rq, rbd_dev, | |
77dfe99f | 1566 | rbd_dev->snap_id, |
602adf40 | 1567 | ofs, |
1fec7093 YS |
1568 | op_size, bio, |
1569 | coll, cur_seg); | |
602adf40 | 1570 | |
1fec7093 | 1571 | next_seg: |
602adf40 YS |
1572 | size -= op_size; |
1573 | ofs += op_size; | |
1574 | ||
1fec7093 | 1575 | cur_seg++; |
602adf40 YS |
1576 | rq_bio = next_bio; |
1577 | } while (size > 0); | |
1fec7093 | 1578 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1579 | |
1580 | if (bp) | |
1581 | bio_pair_release(bp); | |
602adf40 | 1582 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1583 | |
1584 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1585 | } |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1590 | * multiple osd objects. One exception would be with a single page bios, | |
1591 | * which we handle later at bio_chain_clone | |
1592 | */ | |
1593 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1594 | struct bio_vec *bvec) | |
1595 | { | |
1596 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1597 | unsigned int chunk_sectors; |
1598 | sector_t sector; | |
1599 | unsigned int bio_sectors; | |
602adf40 YS |
1600 | int max; |
1601 | ||
593a9e7b AE |
1602 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1603 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1604 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1605 | ||
602adf40 | 1606 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1607 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1608 | if (max < 0) |
1609 | max = 0; /* bio_add cannot handle a negative return */ | |
1610 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1611 | return bvec->bv_len; | |
1612 | return max; | |
1613 | } | |
1614 | ||
1615 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1616 | { | |
1617 | struct gendisk *disk = rbd_dev->disk; | |
1618 | ||
1619 | if (!disk) | |
1620 | return; | |
1621 | ||
1622 | rbd_header_free(&rbd_dev->header); | |
1623 | ||
1624 | if (disk->flags & GENHD_FL_UP) | |
1625 | del_gendisk(disk); | |
1626 | if (disk->queue) | |
1627 | blk_cleanup_queue(disk->queue); | |
1628 | put_disk(disk); | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * reload the ondisk the header | |
1633 | */ | |
1634 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1635 | struct rbd_image_header *header) | |
1636 | { | |
1637 | ssize_t rc; | |
1638 | struct rbd_image_header_ondisk *dh; | |
50f7c4c9 | 1639 | u32 snap_count = 0; |
59c2be1e | 1640 | u64 ver; |
00f1f36f | 1641 | size_t len; |
602adf40 | 1642 | |
00f1f36f AE |
1643 | /* |
1644 | * First reads the fixed-size header to determine the number | |
1645 | * of snapshots, then re-reads it, along with all snapshot | |
1646 | * records as well as their stored names. | |
1647 | */ | |
1648 | len = sizeof (*dh); | |
602adf40 | 1649 | while (1) { |
602adf40 YS |
1650 | dh = kmalloc(len, GFP_KERNEL); |
1651 | if (!dh) | |
1652 | return -ENOMEM; | |
1653 | ||
1654 | rc = rbd_req_sync_read(rbd_dev, | |
9a5d690b | 1655 | CEPH_NOSNAP, |
0bed54dc | 1656 | rbd_dev->header_name, |
602adf40 | 1657 | 0, len, |
59c2be1e | 1658 | (char *)dh, &ver); |
602adf40 YS |
1659 | if (rc < 0) |
1660 | goto out_dh; | |
1661 | ||
ed63f4fd | 1662 | rc = rbd_header_from_disk(header, dh, snap_count); |
81e759fb | 1663 | if (rc < 0) { |
00f1f36f | 1664 | if (rc == -ENXIO) |
81e759fb | 1665 | pr_warning("unrecognized header format" |
0bed54dc AE |
1666 | " for image %s\n", |
1667 | rbd_dev->image_name); | |
602adf40 | 1668 | goto out_dh; |
81e759fb | 1669 | } |
602adf40 | 1670 | |
00f1f36f AE |
1671 | if (snap_count == header->total_snaps) |
1672 | break; | |
1673 | ||
1674 | snap_count = header->total_snaps; | |
1675 | len = sizeof (*dh) + | |
1676 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1677 | header->snap_names_len; | |
1678 | ||
1679 | rbd_header_free(header); | |
1680 | kfree(dh); | |
602adf40 | 1681 | } |
59c2be1e | 1682 | header->obj_version = ver; |
602adf40 YS |
1683 | |
1684 | out_dh: | |
1685 | kfree(dh); | |
1686 | return rc; | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * create a snapshot | |
1691 | */ | |
0ce1a794 | 1692 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, |
602adf40 YS |
1693 | const char *snap_name, |
1694 | gfp_t gfp_flags) | |
1695 | { | |
1696 | int name_len = strlen(snap_name); | |
1697 | u64 new_snapid; | |
1698 | int ret; | |
916d4d67 | 1699 | void *data, *p, *e; |
1dbb4399 | 1700 | struct ceph_mon_client *monc; |
602adf40 YS |
1701 | |
1702 | /* we should create a snapshot only if we're pointing at the head */ | |
0ce1a794 | 1703 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1704 | return -EINVAL; |
1705 | ||
0ce1a794 AE |
1706 | monc = &rbd_dev->rbd_client->client->monc; |
1707 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
bd919d45 | 1708 | dout("created snapid=%llu\n", (unsigned long long) new_snapid); |
602adf40 YS |
1709 | if (ret < 0) |
1710 | return ret; | |
1711 | ||
1712 | data = kmalloc(name_len + 16, gfp_flags); | |
1713 | if (!data) | |
1714 | return -ENOMEM; | |
1715 | ||
916d4d67 SW |
1716 | p = data; |
1717 | e = data + name_len + 16; | |
602adf40 | 1718 | |
916d4d67 SW |
1719 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1720 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1721 | |
0bed54dc | 1722 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1723 | "rbd", "snap_add", |
d67d4be5 | 1724 | data, p - data, NULL); |
602adf40 | 1725 | |
916d4d67 | 1726 | kfree(data); |
602adf40 | 1727 | |
505cbb9b | 1728 | return ret < 0 ? ret : 0; |
602adf40 YS |
1729 | bad: |
1730 | return -ERANGE; | |
1731 | } | |
1732 | ||
dfc5606d YS |
1733 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1734 | { | |
1735 | struct rbd_snap *snap; | |
a0593290 | 1736 | struct rbd_snap *next; |
dfc5606d | 1737 | |
a0593290 | 1738 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1739 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1740 | } |
1741 | ||
602adf40 YS |
1742 | /* |
1743 | * only read the first part of the ondisk header, without the snaps info | |
1744 | */ | |
b813623a | 1745 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1746 | { |
1747 | int ret; | |
1748 | struct rbd_image_header h; | |
602adf40 YS |
1749 | |
1750 | ret = rbd_read_header(rbd_dev, &h); | |
1751 | if (ret < 0) | |
1752 | return ret; | |
1753 | ||
a51aa0c0 JD |
1754 | down_write(&rbd_dev->header_rwsem); |
1755 | ||
9db4b3e3 | 1756 | /* resized? */ |
474ef7ce JD |
1757 | if (rbd_dev->snap_id == CEPH_NOSNAP) { |
1758 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1759 | ||
1760 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1761 | set_capacity(rbd_dev->disk, size); | |
1762 | } | |
9db4b3e3 | 1763 | |
849b4260 | 1764 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1765 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1766 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1767 | /* osd requests may still refer to snapc */ |
1768 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1769 | |
b813623a AE |
1770 | if (hver) |
1771 | *hver = h.obj_version; | |
a71b891b | 1772 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1773 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1774 | rbd_dev->header.total_snaps = h.total_snaps; |
1775 | rbd_dev->header.snapc = h.snapc; | |
1776 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1777 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1778 | rbd_dev->header.snap_sizes = h.snap_sizes; |
849b4260 AE |
1779 | /* Free the extra copy of the object prefix */ |
1780 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1781 | kfree(h.object_prefix); | |
1782 | ||
dfc5606d YS |
1783 | ret = __rbd_init_snaps_header(rbd_dev); |
1784 | ||
c666601a | 1785 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1786 | |
dfc5606d | 1787 | return ret; |
602adf40 YS |
1788 | } |
1789 | ||
1fe5e993 AE |
1790 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1791 | { | |
1792 | int ret; | |
1793 | ||
1794 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1795 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1796 | mutex_unlock(&ctl_mutex); | |
1797 | ||
1798 | return ret; | |
1799 | } | |
1800 | ||
602adf40 YS |
1801 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1802 | { | |
1803 | struct gendisk *disk; | |
1804 | struct request_queue *q; | |
1805 | int rc; | |
593a9e7b | 1806 | u64 segment_size; |
602adf40 YS |
1807 | u64 total_size = 0; |
1808 | ||
1809 | /* contact OSD, request size info about the object being mapped */ | |
1810 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1811 | if (rc) | |
1812 | return rc; | |
1813 | ||
dfc5606d YS |
1814 | /* no need to lock here, as rbd_dev is not registered yet */ |
1815 | rc = __rbd_init_snaps_header(rbd_dev); | |
1816 | if (rc) | |
1817 | return rc; | |
1818 | ||
cc9d734c | 1819 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1820 | if (rc) |
1821 | return rc; | |
1822 | ||
1823 | /* create gendisk info */ | |
1824 | rc = -ENOMEM; | |
1825 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1826 | if (!disk) | |
1827 | goto out; | |
1828 | ||
f0f8cef5 | 1829 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1830 | rbd_dev->dev_id); |
602adf40 YS |
1831 | disk->major = rbd_dev->major; |
1832 | disk->first_minor = 0; | |
1833 | disk->fops = &rbd_bd_ops; | |
1834 | disk->private_data = rbd_dev; | |
1835 | ||
1836 | /* init rq */ | |
1837 | rc = -ENOMEM; | |
1838 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1839 | if (!q) | |
1840 | goto out_disk; | |
029bcbd8 | 1841 | |
593a9e7b AE |
1842 | /* We use the default size, but let's be explicit about it. */ |
1843 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1844 | ||
029bcbd8 | 1845 | /* set io sizes to object size */ |
593a9e7b AE |
1846 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1847 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1848 | blk_queue_max_segment_size(q, segment_size); | |
1849 | blk_queue_io_min(q, segment_size); | |
1850 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1851 | |
602adf40 YS |
1852 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1853 | disk->queue = q; | |
1854 | ||
1855 | q->queuedata = rbd_dev; | |
1856 | ||
1857 | rbd_dev->disk = disk; | |
1858 | rbd_dev->q = q; | |
1859 | ||
1860 | /* finally, announce the disk to the world */ | |
593a9e7b | 1861 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1862 | add_disk(disk); |
1863 | ||
1864 | pr_info("%s: added with size 0x%llx\n", | |
1865 | disk->disk_name, (unsigned long long)total_size); | |
1866 | return 0; | |
1867 | ||
1868 | out_disk: | |
1869 | put_disk(disk); | |
1870 | out: | |
1871 | return rc; | |
1872 | } | |
1873 | ||
dfc5606d YS |
1874 | /* |
1875 | sysfs | |
1876 | */ | |
1877 | ||
593a9e7b AE |
1878 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1879 | { | |
1880 | return container_of(dev, struct rbd_device, dev); | |
1881 | } | |
1882 | ||
dfc5606d YS |
1883 | static ssize_t rbd_size_show(struct device *dev, |
1884 | struct device_attribute *attr, char *buf) | |
1885 | { | |
593a9e7b | 1886 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1887 | sector_t size; |
1888 | ||
1889 | down_read(&rbd_dev->header_rwsem); | |
1890 | size = get_capacity(rbd_dev->disk); | |
1891 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1892 | |
a51aa0c0 | 1893 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1894 | } |
1895 | ||
1896 | static ssize_t rbd_major_show(struct device *dev, | |
1897 | struct device_attribute *attr, char *buf) | |
1898 | { | |
593a9e7b | 1899 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1900 | |
dfc5606d YS |
1901 | return sprintf(buf, "%d\n", rbd_dev->major); |
1902 | } | |
1903 | ||
1904 | static ssize_t rbd_client_id_show(struct device *dev, | |
1905 | struct device_attribute *attr, char *buf) | |
602adf40 | 1906 | { |
593a9e7b | 1907 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1908 | |
1dbb4399 AE |
1909 | return sprintf(buf, "client%lld\n", |
1910 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1911 | } |
1912 | ||
dfc5606d YS |
1913 | static ssize_t rbd_pool_show(struct device *dev, |
1914 | struct device_attribute *attr, char *buf) | |
602adf40 | 1915 | { |
593a9e7b | 1916 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1917 | |
1918 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1919 | } | |
1920 | ||
9bb2f334 AE |
1921 | static ssize_t rbd_pool_id_show(struct device *dev, |
1922 | struct device_attribute *attr, char *buf) | |
1923 | { | |
1924 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1925 | ||
1926 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1927 | } | |
1928 | ||
dfc5606d YS |
1929 | static ssize_t rbd_name_show(struct device *dev, |
1930 | struct device_attribute *attr, char *buf) | |
1931 | { | |
593a9e7b | 1932 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1933 | |
0bed54dc | 1934 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1935 | } |
1936 | ||
1937 | static ssize_t rbd_snap_show(struct device *dev, | |
1938 | struct device_attribute *attr, | |
1939 | char *buf) | |
1940 | { | |
593a9e7b | 1941 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1942 | |
1943 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1944 | } | |
1945 | ||
1946 | static ssize_t rbd_image_refresh(struct device *dev, | |
1947 | struct device_attribute *attr, | |
1948 | const char *buf, | |
1949 | size_t size) | |
1950 | { | |
593a9e7b | 1951 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1952 | int ret; |
602adf40 | 1953 | |
1fe5e993 | 1954 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1955 | |
1956 | return ret < 0 ? ret : size; | |
dfc5606d | 1957 | } |
602adf40 | 1958 | |
dfc5606d YS |
1959 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1960 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1961 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1962 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1963 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1964 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1965 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1966 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1967 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1968 | |
1969 | static struct attribute *rbd_attrs[] = { | |
1970 | &dev_attr_size.attr, | |
1971 | &dev_attr_major.attr, | |
1972 | &dev_attr_client_id.attr, | |
1973 | &dev_attr_pool.attr, | |
9bb2f334 | 1974 | &dev_attr_pool_id.attr, |
dfc5606d YS |
1975 | &dev_attr_name.attr, |
1976 | &dev_attr_current_snap.attr, | |
1977 | &dev_attr_refresh.attr, | |
1978 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1979 | NULL |
1980 | }; | |
1981 | ||
1982 | static struct attribute_group rbd_attr_group = { | |
1983 | .attrs = rbd_attrs, | |
1984 | }; | |
1985 | ||
1986 | static const struct attribute_group *rbd_attr_groups[] = { | |
1987 | &rbd_attr_group, | |
1988 | NULL | |
1989 | }; | |
1990 | ||
1991 | static void rbd_sysfs_dev_release(struct device *dev) | |
1992 | { | |
1993 | } | |
1994 | ||
1995 | static struct device_type rbd_device_type = { | |
1996 | .name = "rbd", | |
1997 | .groups = rbd_attr_groups, | |
1998 | .release = rbd_sysfs_dev_release, | |
1999 | }; | |
2000 | ||
2001 | ||
2002 | /* | |
2003 | sysfs - snapshots | |
2004 | */ | |
2005 | ||
2006 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2007 | struct device_attribute *attr, | |
2008 | char *buf) | |
2009 | { | |
2010 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2011 | ||
3591538f | 2012 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2013 | } |
2014 | ||
2015 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2016 | struct device_attribute *attr, | |
2017 | char *buf) | |
2018 | { | |
2019 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2020 | ||
3591538f | 2021 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2022 | } |
2023 | ||
2024 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
2025 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
2026 | ||
2027 | static struct attribute *rbd_snap_attrs[] = { | |
2028 | &dev_attr_snap_size.attr, | |
2029 | &dev_attr_snap_id.attr, | |
2030 | NULL, | |
2031 | }; | |
2032 | ||
2033 | static struct attribute_group rbd_snap_attr_group = { | |
2034 | .attrs = rbd_snap_attrs, | |
2035 | }; | |
2036 | ||
2037 | static void rbd_snap_dev_release(struct device *dev) | |
2038 | { | |
2039 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2040 | kfree(snap->name); | |
2041 | kfree(snap); | |
2042 | } | |
2043 | ||
2044 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2045 | &rbd_snap_attr_group, | |
2046 | NULL | |
2047 | }; | |
2048 | ||
2049 | static struct device_type rbd_snap_device_type = { | |
2050 | .groups = rbd_snap_attr_groups, | |
2051 | .release = rbd_snap_dev_release, | |
2052 | }; | |
2053 | ||
14e7085d | 2054 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2055 | { |
2056 | list_del(&snap->node); | |
2057 | device_unregister(&snap->dev); | |
2058 | } | |
2059 | ||
14e7085d | 2060 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2061 | struct device *parent) |
2062 | { | |
2063 | struct device *dev = &snap->dev; | |
2064 | int ret; | |
2065 | ||
2066 | dev->type = &rbd_snap_device_type; | |
2067 | dev->parent = parent; | |
2068 | dev->release = rbd_snap_dev_release; | |
2069 | dev_set_name(dev, "snap_%s", snap->name); | |
2070 | ret = device_register(dev); | |
2071 | ||
2072 | return ret; | |
2073 | } | |
2074 | ||
4e891e0a AE |
2075 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2076 | int i, const char *name) | |
dfc5606d | 2077 | { |
4e891e0a | 2078 | struct rbd_snap *snap; |
dfc5606d | 2079 | int ret; |
4e891e0a AE |
2080 | |
2081 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2082 | if (!snap) |
4e891e0a AE |
2083 | return ERR_PTR(-ENOMEM); |
2084 | ||
2085 | ret = -ENOMEM; | |
dfc5606d | 2086 | snap->name = kstrdup(name, GFP_KERNEL); |
4e891e0a AE |
2087 | if (!snap->name) |
2088 | goto err; | |
2089 | ||
dfc5606d YS |
2090 | snap->size = rbd_dev->header.snap_sizes[i]; |
2091 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2092 | if (device_is_registered(&rbd_dev->dev)) { | |
14e7085d | 2093 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d YS |
2094 | if (ret < 0) |
2095 | goto err; | |
2096 | } | |
4e891e0a AE |
2097 | |
2098 | return snap; | |
2099 | ||
dfc5606d YS |
2100 | err: |
2101 | kfree(snap->name); | |
2102 | kfree(snap); | |
4e891e0a AE |
2103 | |
2104 | return ERR_PTR(ret); | |
dfc5606d YS |
2105 | } |
2106 | ||
2107 | /* | |
35938150 AE |
2108 | * Scan the rbd device's current snapshot list and compare it to the |
2109 | * newly-received snapshot context. Remove any existing snapshots | |
2110 | * not present in the new snapshot context. Add a new snapshot for | |
2111 | * any snaphots in the snapshot context not in the current list. | |
2112 | * And verify there are no changes to snapshots we already know | |
2113 | * about. | |
2114 | * | |
2115 | * Assumes the snapshots in the snapshot context are sorted by | |
2116 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2117 | * are also maintained in that order.) | |
dfc5606d YS |
2118 | */ |
2119 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2120 | { | |
35938150 AE |
2121 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2122 | const u32 snap_count = snapc->num_snaps; | |
2123 | char *snap_name = rbd_dev->header.snap_names; | |
2124 | struct list_head *head = &rbd_dev->snaps; | |
2125 | struct list_head *links = head->next; | |
2126 | u32 index = 0; | |
dfc5606d | 2127 | |
35938150 AE |
2128 | while (index < snap_count || links != head) { |
2129 | u64 snap_id; | |
2130 | struct rbd_snap *snap; | |
dfc5606d | 2131 | |
35938150 AE |
2132 | snap_id = index < snap_count ? snapc->snaps[index] |
2133 | : CEPH_NOSNAP; | |
2134 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2135 | : NULL; | |
2136 | BUG_ON(snap && snap->id == CEPH_NOSNAP); | |
dfc5606d | 2137 | |
35938150 AE |
2138 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2139 | struct list_head *next = links->next; | |
dfc5606d | 2140 | |
35938150 | 2141 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2142 | |
35938150 | 2143 | if (rbd_dev->snap_id == snap->id) |
e88a36ec | 2144 | rbd_dev->snap_exists = false; |
35938150 AE |
2145 | __rbd_remove_snap_dev(snap); |
2146 | ||
2147 | /* Done with this list entry; advance */ | |
2148 | ||
2149 | links = next; | |
dfc5606d YS |
2150 | continue; |
2151 | } | |
35938150 AE |
2152 | |
2153 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { | |
2154 | struct rbd_snap *new_snap; | |
2155 | ||
2156 | /* We haven't seen this snapshot before */ | |
2157 | ||
2158 | new_snap = __rbd_add_snap_dev(rbd_dev, index, | |
2159 | snap_name); | |
2160 | if (IS_ERR(new_snap)) | |
2161 | return PTR_ERR(new_snap); | |
2162 | ||
2163 | /* New goes before existing, or at end of list */ | |
2164 | ||
2165 | if (snap) | |
2166 | list_add_tail(&new_snap->node, &snap->node); | |
2167 | else | |
2168 | list_add(&new_snap->node, head); | |
2169 | } else { | |
2170 | /* Already have this one */ | |
2171 | ||
2172 | BUG_ON(snap->size != rbd_dev->header.snap_sizes[index]); | |
2173 | BUG_ON(strcmp(snap->name, snap_name)); | |
2174 | ||
2175 | /* Done with this list entry; advance */ | |
2176 | ||
2177 | links = links->next; | |
dfc5606d | 2178 | } |
35938150 AE |
2179 | |
2180 | /* Advance to the next entry in the snapshot context */ | |
2181 | ||
2182 | index++; | |
2183 | snap_name += strlen(snap_name) + 1; | |
dfc5606d YS |
2184 | } |
2185 | ||
2186 | return 0; | |
2187 | } | |
2188 | ||
dfc5606d YS |
2189 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2190 | { | |
f0f8cef5 | 2191 | int ret; |
dfc5606d YS |
2192 | struct device *dev; |
2193 | struct rbd_snap *snap; | |
2194 | ||
2195 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2196 | dev = &rbd_dev->dev; | |
2197 | ||
2198 | dev->bus = &rbd_bus_type; | |
2199 | dev->type = &rbd_device_type; | |
2200 | dev->parent = &rbd_root_dev; | |
2201 | dev->release = rbd_dev_release; | |
de71a297 | 2202 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d YS |
2203 | ret = device_register(dev); |
2204 | if (ret < 0) | |
f0f8cef5 | 2205 | goto out; |
dfc5606d YS |
2206 | |
2207 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
14e7085d | 2208 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d | 2209 | if (ret < 0) |
602adf40 YS |
2210 | break; |
2211 | } | |
f0f8cef5 | 2212 | out: |
dfc5606d YS |
2213 | mutex_unlock(&ctl_mutex); |
2214 | return ret; | |
602adf40 YS |
2215 | } |
2216 | ||
dfc5606d YS |
2217 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2218 | { | |
2219 | device_unregister(&rbd_dev->dev); | |
2220 | } | |
2221 | ||
59c2be1e YS |
2222 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2223 | { | |
2224 | int ret, rc; | |
2225 | ||
2226 | do { | |
0e6f322d | 2227 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2228 | if (ret == -ERANGE) { |
1fe5e993 | 2229 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2230 | if (rc < 0) |
2231 | return rc; | |
2232 | } | |
2233 | } while (ret == -ERANGE); | |
2234 | ||
2235 | return ret; | |
2236 | } | |
2237 | ||
1ddbe94e AE |
2238 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2239 | ||
2240 | /* | |
499afd5b AE |
2241 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2242 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2243 | */ |
499afd5b | 2244 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2245 | { |
de71a297 | 2246 | rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max); |
499afd5b AE |
2247 | |
2248 | spin_lock(&rbd_dev_list_lock); | |
2249 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2250 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2251 | } |
b7f23c36 | 2252 | |
1ddbe94e | 2253 | /* |
499afd5b AE |
2254 | * Remove an rbd_dev from the global list, and record that its |
2255 | * identifier is no longer in use. | |
1ddbe94e | 2256 | */ |
499afd5b | 2257 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2258 | { |
d184f6bf | 2259 | struct list_head *tmp; |
de71a297 | 2260 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2261 | int max_id; |
2262 | ||
2263 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2264 | |
2265 | spin_lock(&rbd_dev_list_lock); | |
2266 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2267 | |
2268 | /* | |
2269 | * If the id being "put" is not the current maximum, there | |
2270 | * is nothing special we need to do. | |
2271 | */ | |
2272 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2273 | spin_unlock(&rbd_dev_list_lock); | |
2274 | return; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * We need to update the current maximum id. Search the | |
2279 | * list to find out what it is. We're more likely to find | |
2280 | * the maximum at the end, so search the list backward. | |
2281 | */ | |
2282 | max_id = 0; | |
2283 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2284 | struct rbd_device *rbd_dev; | |
2285 | ||
2286 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2287 | if (rbd_id > max_id) | |
2288 | max_id = rbd_id; | |
2289 | } | |
499afd5b | 2290 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2291 | |
1ddbe94e | 2292 | /* |
d184f6bf AE |
2293 | * The max id could have been updated by rbd_id_get(), in |
2294 | * which case it now accurately reflects the new maximum. | |
2295 | * Be careful not to overwrite the maximum value in that | |
2296 | * case. | |
1ddbe94e | 2297 | */ |
d184f6bf | 2298 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2299 | } |
2300 | ||
e28fff26 AE |
2301 | /* |
2302 | * Skips over white space at *buf, and updates *buf to point to the | |
2303 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2304 | * the token (string of non-white space characters) found. Note |
2305 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2306 | */ |
2307 | static inline size_t next_token(const char **buf) | |
2308 | { | |
2309 | /* | |
2310 | * These are the characters that produce nonzero for | |
2311 | * isspace() in the "C" and "POSIX" locales. | |
2312 | */ | |
2313 | const char *spaces = " \f\n\r\t\v"; | |
2314 | ||
2315 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2316 | ||
2317 | return strcspn(*buf, spaces); /* Return token length */ | |
2318 | } | |
2319 | ||
2320 | /* | |
2321 | * Finds the next token in *buf, and if the provided token buffer is | |
2322 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2323 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2324 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2325 | * |
2326 | * Returns the length of the token found (not including the '\0'). | |
2327 | * Return value will be 0 if no token is found, and it will be >= | |
2328 | * token_size if the token would not fit. | |
2329 | * | |
593a9e7b | 2330 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2331 | * found token. Note that this occurs even if the token buffer is |
2332 | * too small to hold it. | |
2333 | */ | |
2334 | static inline size_t copy_token(const char **buf, | |
2335 | char *token, | |
2336 | size_t token_size) | |
2337 | { | |
2338 | size_t len; | |
2339 | ||
2340 | len = next_token(buf); | |
2341 | if (len < token_size) { | |
2342 | memcpy(token, *buf, len); | |
2343 | *(token + len) = '\0'; | |
2344 | } | |
2345 | *buf += len; | |
2346 | ||
2347 | return len; | |
2348 | } | |
2349 | ||
ea3352f4 AE |
2350 | /* |
2351 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2352 | * enough to hold a copy of it, and copies the token into the new | |
2353 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2354 | * that a duplicate buffer is created even for a zero-length token. | |
2355 | * | |
2356 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2357 | * pointer if memory for the duplicate was not available. If | |
2358 | * the lenp argument is a non-null pointer, the length of the token | |
2359 | * (not including the '\0') is returned in *lenp. | |
2360 | * | |
2361 | * If successful, the *buf pointer will be updated to point beyond | |
2362 | * the end of the found token. | |
2363 | * | |
2364 | * Note: uses GFP_KERNEL for allocation. | |
2365 | */ | |
2366 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2367 | { | |
2368 | char *dup; | |
2369 | size_t len; | |
2370 | ||
2371 | len = next_token(buf); | |
2372 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2373 | if (!dup) | |
2374 | return NULL; | |
2375 | ||
2376 | memcpy(dup, *buf, len); | |
2377 | *(dup + len) = '\0'; | |
2378 | *buf += len; | |
2379 | ||
2380 | if (lenp) | |
2381 | *lenp = len; | |
2382 | ||
2383 | return dup; | |
2384 | } | |
2385 | ||
a725f65e | 2386 | /* |
0bed54dc | 2387 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2388 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2389 | * on the list of monitor addresses and other options provided via | |
2390 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2391 | * |
2392 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2393 | */ |
2394 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2395 | const char *buf, | |
7ef3214a | 2396 | const char **mon_addrs, |
5214ecc4 | 2397 | size_t *mon_addrs_size, |
e28fff26 | 2398 | char *options, |
0bed54dc | 2399 | size_t options_size) |
e28fff26 | 2400 | { |
d22f76e7 AE |
2401 | size_t len; |
2402 | int ret; | |
e28fff26 AE |
2403 | |
2404 | /* The first four tokens are required */ | |
2405 | ||
7ef3214a AE |
2406 | len = next_token(&buf); |
2407 | if (!len) | |
a725f65e | 2408 | return -EINVAL; |
5214ecc4 | 2409 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2410 | *mon_addrs = buf; |
2411 | ||
2412 | buf += len; | |
a725f65e | 2413 | |
e28fff26 AE |
2414 | len = copy_token(&buf, options, options_size); |
2415 | if (!len || len >= options_size) | |
2416 | return -EINVAL; | |
2417 | ||
bf3e5ae1 | 2418 | ret = -ENOMEM; |
d22f76e7 AE |
2419 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2420 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2421 | goto out_err; |
e28fff26 | 2422 | |
0bed54dc AE |
2423 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2424 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2425 | goto out_err; |
a725f65e | 2426 | |
cb8627c7 AE |
2427 | /* Create the name of the header object */ |
2428 | ||
0bed54dc | 2429 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2430 | + sizeof (RBD_SUFFIX), |
2431 | GFP_KERNEL); | |
0bed54dc | 2432 | if (!rbd_dev->header_name) |
cb8627c7 | 2433 | goto out_err; |
0bed54dc | 2434 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2435 | |
e28fff26 | 2436 | /* |
820a5f3e AE |
2437 | * The snapshot name is optional. If none is is supplied, |
2438 | * we use the default value. | |
e28fff26 | 2439 | */ |
820a5f3e AE |
2440 | rbd_dev->snap_name = dup_token(&buf, &len); |
2441 | if (!rbd_dev->snap_name) | |
2442 | goto out_err; | |
2443 | if (!len) { | |
2444 | /* Replace the empty name with the default */ | |
2445 | kfree(rbd_dev->snap_name); | |
2446 | rbd_dev->snap_name | |
2447 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2448 | if (!rbd_dev->snap_name) | |
2449 | goto out_err; | |
2450 | ||
e28fff26 AE |
2451 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
2452 | sizeof (RBD_SNAP_HEAD_NAME)); | |
849b4260 | 2453 | } |
e28fff26 | 2454 | |
a725f65e | 2455 | return 0; |
d22f76e7 AE |
2456 | |
2457 | out_err: | |
0bed54dc | 2458 | kfree(rbd_dev->header_name); |
d78fd7ae | 2459 | rbd_dev->header_name = NULL; |
0bed54dc | 2460 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2461 | rbd_dev->image_name = NULL; |
2462 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2463 | kfree(rbd_dev->pool_name); |
2464 | rbd_dev->pool_name = NULL; | |
2465 | ||
2466 | return ret; | |
a725f65e AE |
2467 | } |
2468 | ||
59c2be1e YS |
2469 | static ssize_t rbd_add(struct bus_type *bus, |
2470 | const char *buf, | |
2471 | size_t count) | |
602adf40 | 2472 | { |
cb8627c7 AE |
2473 | char *options; |
2474 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2475 | const char *mon_addrs = NULL; |
2476 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2477 | struct ceph_osd_client *osdc; |
2478 | int rc = -ENOMEM; | |
602adf40 YS |
2479 | |
2480 | if (!try_module_get(THIS_MODULE)) | |
2481 | return -ENODEV; | |
2482 | ||
60571c7d | 2483 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2484 | if (!options) |
27cc2594 | 2485 | goto err_nomem; |
cb8627c7 AE |
2486 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2487 | if (!rbd_dev) | |
2488 | goto err_nomem; | |
602adf40 YS |
2489 | |
2490 | /* static rbd_device initialization */ | |
2491 | spin_lock_init(&rbd_dev->lock); | |
2492 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2493 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2494 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2495 | |
d184f6bf | 2496 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2497 | rbd_id_get(rbd_dev); |
602adf40 | 2498 | |
a725f65e | 2499 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2500 | BUILD_BUG_ON(DEV_NAME_LEN |
2501 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
de71a297 | 2502 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
a725f65e | 2503 | |
602adf40 | 2504 | /* parse add command */ |
7ef3214a | 2505 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2506 | options, count); |
a725f65e | 2507 | if (rc) |
f0f8cef5 | 2508 | goto err_put_id; |
e124a82f | 2509 | |
5214ecc4 AE |
2510 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
2511 | options); | |
d720bcb0 AE |
2512 | if (IS_ERR(rbd_dev->rbd_client)) { |
2513 | rc = PTR_ERR(rbd_dev->rbd_client); | |
d78fd7ae | 2514 | rbd_dev->rbd_client = NULL; |
f0f8cef5 | 2515 | goto err_put_id; |
d720bcb0 | 2516 | } |
602adf40 | 2517 | |
602adf40 | 2518 | /* pick the pool */ |
1dbb4399 | 2519 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2520 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2521 | if (rc < 0) | |
2522 | goto err_out_client; | |
9bb2f334 | 2523 | rbd_dev->pool_id = rc; |
602adf40 YS |
2524 | |
2525 | /* register our block device */ | |
27cc2594 AE |
2526 | rc = register_blkdev(0, rbd_dev->name); |
2527 | if (rc < 0) | |
602adf40 | 2528 | goto err_out_client; |
27cc2594 | 2529 | rbd_dev->major = rc; |
602adf40 | 2530 | |
dfc5606d YS |
2531 | rc = rbd_bus_add_dev(rbd_dev); |
2532 | if (rc) | |
766fc439 YS |
2533 | goto err_out_blkdev; |
2534 | ||
32eec68d AE |
2535 | /* |
2536 | * At this point cleanup in the event of an error is the job | |
2537 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2538 | * | |
2539 | * Set up and announce blkdev mapping. | |
2540 | */ | |
602adf40 YS |
2541 | rc = rbd_init_disk(rbd_dev); |
2542 | if (rc) | |
766fc439 | 2543 | goto err_out_bus; |
602adf40 | 2544 | |
59c2be1e YS |
2545 | rc = rbd_init_watch_dev(rbd_dev); |
2546 | if (rc) | |
2547 | goto err_out_bus; | |
2548 | ||
602adf40 YS |
2549 | return count; |
2550 | ||
766fc439 | 2551 | err_out_bus: |
766fc439 YS |
2552 | /* this will also clean up rest of rbd_dev stuff */ |
2553 | ||
2554 | rbd_bus_del_dev(rbd_dev); | |
2555 | kfree(options); | |
766fc439 YS |
2556 | return rc; |
2557 | ||
602adf40 YS |
2558 | err_out_blkdev: |
2559 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2560 | err_out_client: | |
2561 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2562 | err_put_id: |
cb8627c7 | 2563 | if (rbd_dev->pool_name) { |
820a5f3e | 2564 | kfree(rbd_dev->snap_name); |
0bed54dc AE |
2565 | kfree(rbd_dev->header_name); |
2566 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2567 | kfree(rbd_dev->pool_name); |
2568 | } | |
499afd5b | 2569 | rbd_id_put(rbd_dev); |
27cc2594 | 2570 | err_nomem: |
27cc2594 | 2571 | kfree(rbd_dev); |
cb8627c7 | 2572 | kfree(options); |
27cc2594 | 2573 | |
602adf40 YS |
2574 | dout("Error adding device %s\n", buf); |
2575 | module_put(THIS_MODULE); | |
27cc2594 AE |
2576 | |
2577 | return (ssize_t) rc; | |
602adf40 YS |
2578 | } |
2579 | ||
de71a297 | 2580 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2581 | { |
2582 | struct list_head *tmp; | |
2583 | struct rbd_device *rbd_dev; | |
2584 | ||
e124a82f | 2585 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2586 | list_for_each(tmp, &rbd_dev_list) { |
2587 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2588 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2589 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2590 | return rbd_dev; |
e124a82f | 2591 | } |
602adf40 | 2592 | } |
e124a82f | 2593 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2594 | return NULL; |
2595 | } | |
2596 | ||
dfc5606d | 2597 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2598 | { |
593a9e7b | 2599 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2600 | |
1dbb4399 AE |
2601 | if (rbd_dev->watch_request) { |
2602 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2603 | ||
2604 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2605 | rbd_dev->watch_request); |
1dbb4399 | 2606 | } |
59c2be1e | 2607 | if (rbd_dev->watch_event) |
070c633f | 2608 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2609 | |
602adf40 YS |
2610 | rbd_put_client(rbd_dev); |
2611 | ||
2612 | /* clean up and free blkdev */ | |
2613 | rbd_free_disk(rbd_dev); | |
2614 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2615 | |
2616 | /* done with the id, and with the rbd_dev */ | |
820a5f3e | 2617 | kfree(rbd_dev->snap_name); |
0bed54dc | 2618 | kfree(rbd_dev->header_name); |
d22f76e7 | 2619 | kfree(rbd_dev->pool_name); |
0bed54dc | 2620 | kfree(rbd_dev->image_name); |
32eec68d | 2621 | rbd_id_put(rbd_dev); |
602adf40 YS |
2622 | kfree(rbd_dev); |
2623 | ||
2624 | /* release module ref */ | |
2625 | module_put(THIS_MODULE); | |
602adf40 YS |
2626 | } |
2627 | ||
dfc5606d YS |
2628 | static ssize_t rbd_remove(struct bus_type *bus, |
2629 | const char *buf, | |
2630 | size_t count) | |
602adf40 YS |
2631 | { |
2632 | struct rbd_device *rbd_dev = NULL; | |
2633 | int target_id, rc; | |
2634 | unsigned long ul; | |
2635 | int ret = count; | |
2636 | ||
2637 | rc = strict_strtoul(buf, 10, &ul); | |
2638 | if (rc) | |
2639 | return rc; | |
2640 | ||
2641 | /* convert to int; abort if we lost anything in the conversion */ | |
2642 | target_id = (int) ul; | |
2643 | if (target_id != ul) | |
2644 | return -EINVAL; | |
2645 | ||
2646 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2647 | ||
2648 | rbd_dev = __rbd_get_dev(target_id); | |
2649 | if (!rbd_dev) { | |
2650 | ret = -ENOENT; | |
2651 | goto done; | |
2652 | } | |
2653 | ||
dfc5606d YS |
2654 | __rbd_remove_all_snaps(rbd_dev); |
2655 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2656 | |
2657 | done: | |
2658 | mutex_unlock(&ctl_mutex); | |
2659 | return ret; | |
2660 | } | |
2661 | ||
dfc5606d YS |
2662 | static ssize_t rbd_snap_add(struct device *dev, |
2663 | struct device_attribute *attr, | |
2664 | const char *buf, | |
2665 | size_t count) | |
602adf40 | 2666 | { |
593a9e7b | 2667 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2668 | int ret; |
2669 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2670 | if (!name) |
2671 | return -ENOMEM; | |
2672 | ||
dfc5606d | 2673 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2674 | |
2675 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2676 | ||
602adf40 YS |
2677 | ret = rbd_header_add_snap(rbd_dev, |
2678 | name, GFP_KERNEL); | |
2679 | if (ret < 0) | |
59c2be1e | 2680 | goto err_unlock; |
602adf40 | 2681 | |
b813623a | 2682 | ret = __rbd_refresh_header(rbd_dev, NULL); |
602adf40 | 2683 | if (ret < 0) |
59c2be1e YS |
2684 | goto err_unlock; |
2685 | ||
2686 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2687 | trigger a watch callback that would need to get that mutex */ | |
2688 | mutex_unlock(&ctl_mutex); | |
2689 | ||
2690 | /* make a best effort, don't error if failed */ | |
4cb16250 | 2691 | rbd_req_sync_notify(rbd_dev); |
602adf40 YS |
2692 | |
2693 | ret = count; | |
59c2be1e YS |
2694 | kfree(name); |
2695 | return ret; | |
2696 | ||
2697 | err_unlock: | |
602adf40 | 2698 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2699 | kfree(name); |
2700 | return ret; | |
2701 | } | |
2702 | ||
602adf40 YS |
2703 | /* |
2704 | * create control files in sysfs | |
dfc5606d | 2705 | * /sys/bus/rbd/... |
602adf40 YS |
2706 | */ |
2707 | static int rbd_sysfs_init(void) | |
2708 | { | |
dfc5606d | 2709 | int ret; |
602adf40 | 2710 | |
fed4c143 | 2711 | ret = device_register(&rbd_root_dev); |
21079786 | 2712 | if (ret < 0) |
dfc5606d | 2713 | return ret; |
602adf40 | 2714 | |
fed4c143 AE |
2715 | ret = bus_register(&rbd_bus_type); |
2716 | if (ret < 0) | |
2717 | device_unregister(&rbd_root_dev); | |
602adf40 | 2718 | |
602adf40 YS |
2719 | return ret; |
2720 | } | |
2721 | ||
2722 | static void rbd_sysfs_cleanup(void) | |
2723 | { | |
dfc5606d | 2724 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2725 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2726 | } |
2727 | ||
2728 | int __init rbd_init(void) | |
2729 | { | |
2730 | int rc; | |
2731 | ||
2732 | rc = rbd_sysfs_init(); | |
2733 | if (rc) | |
2734 | return rc; | |
f0f8cef5 | 2735 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2736 | return 0; |
2737 | } | |
2738 | ||
2739 | void __exit rbd_exit(void) | |
2740 | { | |
2741 | rbd_sysfs_cleanup(); | |
2742 | } | |
2743 | ||
2744 | module_init(rbd_init); | |
2745 | module_exit(rbd_exit); | |
2746 | ||
2747 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2748 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2749 | MODULE_DESCRIPTION("rados block device"); | |
2750 | ||
2751 | /* following authorship retained from original osdblk.c */ | |
2752 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2753 | ||
2754 | MODULE_LICENSE("GPL"); |