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 | ||
44 | #define DRV_NAME "rbd" | |
45 | #define DRV_NAME_LONG "rbd (rados block device)" | |
46 | ||
47 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
48 | ||
49 | #define RBD_MAX_MD_NAME_LEN (96 + sizeof(RBD_SUFFIX)) | |
50 | #define RBD_MAX_POOL_NAME_LEN 64 | |
51 | #define RBD_MAX_SNAP_NAME_LEN 32 | |
52 | #define RBD_MAX_OPT_LEN 1024 | |
53 | ||
54 | #define RBD_SNAP_HEAD_NAME "-" | |
55 | ||
56 | #define DEV_NAME_LEN 32 | |
57 | ||
59c2be1e YS |
58 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
59 | ||
602adf40 YS |
60 | /* |
61 | * block device image metadata (in-memory version) | |
62 | */ | |
63 | struct rbd_image_header { | |
64 | u64 image_size; | |
65 | char block_name[32]; | |
66 | __u8 obj_order; | |
67 | __u8 crypt_type; | |
68 | __u8 comp_type; | |
69 | struct rw_semaphore snap_rwsem; | |
70 | struct ceph_snap_context *snapc; | |
71 | size_t snap_names_len; | |
72 | u64 snap_seq; | |
73 | u32 total_snaps; | |
74 | ||
75 | char *snap_names; | |
76 | u64 *snap_sizes; | |
59c2be1e YS |
77 | |
78 | u64 obj_version; | |
79 | }; | |
80 | ||
81 | struct rbd_options { | |
82 | int notify_timeout; | |
602adf40 YS |
83 | }; |
84 | ||
85 | /* | |
86 | * an instance of the client. multiple devices may share a client. | |
87 | */ | |
88 | struct rbd_client { | |
89 | struct ceph_client *client; | |
59c2be1e | 90 | struct rbd_options *rbd_opts; |
602adf40 YS |
91 | struct kref kref; |
92 | struct list_head node; | |
93 | }; | |
94 | ||
1fec7093 YS |
95 | struct rbd_req_coll; |
96 | ||
602adf40 YS |
97 | /* |
98 | * a single io request | |
99 | */ | |
100 | struct rbd_request { | |
101 | struct request *rq; /* blk layer request */ | |
102 | struct bio *bio; /* cloned bio */ | |
103 | struct page **pages; /* list of used pages */ | |
104 | u64 len; | |
1fec7093 YS |
105 | int coll_index; |
106 | struct rbd_req_coll *coll; | |
107 | }; | |
108 | ||
109 | struct rbd_req_status { | |
110 | int done; | |
111 | int rc; | |
112 | u64 bytes; | |
113 | }; | |
114 | ||
115 | /* | |
116 | * a collection of requests | |
117 | */ | |
118 | struct rbd_req_coll { | |
119 | int total; | |
120 | int num_done; | |
121 | struct kref kref; | |
122 | struct rbd_req_status status[0]; | |
602adf40 YS |
123 | }; |
124 | ||
dfc5606d YS |
125 | struct rbd_snap { |
126 | struct device dev; | |
127 | const char *name; | |
128 | size_t size; | |
129 | struct list_head node; | |
130 | u64 id; | |
131 | }; | |
132 | ||
602adf40 YS |
133 | /* |
134 | * a single device | |
135 | */ | |
136 | struct rbd_device { | |
137 | int id; /* blkdev unique id */ | |
138 | ||
139 | int major; /* blkdev assigned major */ | |
140 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
141 | struct request_queue *q; | |
142 | ||
143 | struct ceph_client *client; | |
144 | struct rbd_client *rbd_client; | |
145 | ||
146 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
147 | ||
148 | spinlock_t lock; /* queue lock */ | |
149 | ||
150 | struct rbd_image_header header; | |
151 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ | |
152 | int obj_len; | |
153 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ | |
154 | char pool_name[RBD_MAX_POOL_NAME_LEN]; | |
155 | int poolid; | |
156 | ||
59c2be1e YS |
157 | struct ceph_osd_event *watch_event; |
158 | struct ceph_osd_request *watch_request; | |
159 | ||
602adf40 YS |
160 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; |
161 | u32 cur_snap; /* index+1 of current snapshot within snap context | |
162 | 0 - for the head */ | |
163 | int read_only; | |
164 | ||
165 | struct list_head node; | |
dfc5606d YS |
166 | |
167 | /* list of snapshots */ | |
168 | struct list_head snaps; | |
169 | ||
170 | /* sysfs related */ | |
171 | struct device dev; | |
172 | }; | |
173 | ||
174 | static struct bus_type rbd_bus_type = { | |
175 | .name = "rbd", | |
602adf40 YS |
176 | }; |
177 | ||
178 | static spinlock_t node_lock; /* protects client get/put */ | |
179 | ||
602adf40 YS |
180 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
181 | static LIST_HEAD(rbd_dev_list); /* devices */ | |
182 | static LIST_HEAD(rbd_client_list); /* clients */ | |
183 | ||
dfc5606d YS |
184 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
185 | static void rbd_dev_release(struct device *dev); | |
186 | static ssize_t rbd_snap_rollback(struct device *dev, | |
187 | struct device_attribute *attr, | |
188 | const char *buf, | |
189 | size_t size); | |
190 | static ssize_t rbd_snap_add(struct device *dev, | |
191 | struct device_attribute *attr, | |
192 | const char *buf, | |
193 | size_t count); | |
194 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
195 | struct rbd_snap *snap);; | |
196 | ||
197 | ||
198 | static struct rbd_device *dev_to_rbd(struct device *dev) | |
199 | { | |
200 | return container_of(dev, struct rbd_device, dev); | |
201 | } | |
202 | ||
203 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) | |
204 | { | |
205 | return get_device(&rbd_dev->dev); | |
206 | } | |
207 | ||
208 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
209 | { | |
210 | put_device(&rbd_dev->dev); | |
211 | } | |
602adf40 | 212 | |
59c2be1e YS |
213 | static int __rbd_update_snaps(struct rbd_device *rbd_dev); |
214 | ||
602adf40 YS |
215 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
216 | { | |
217 | struct gendisk *disk = bdev->bd_disk; | |
218 | struct rbd_device *rbd_dev = disk->private_data; | |
219 | ||
dfc5606d YS |
220 | rbd_get_dev(rbd_dev); |
221 | ||
602adf40 YS |
222 | set_device_ro(bdev, rbd_dev->read_only); |
223 | ||
224 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
225 | return -EROFS; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
dfc5606d YS |
230 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
231 | { | |
232 | struct rbd_device *rbd_dev = disk->private_data; | |
233 | ||
234 | rbd_put_dev(rbd_dev); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
602adf40 YS |
239 | static const struct block_device_operations rbd_bd_ops = { |
240 | .owner = THIS_MODULE, | |
241 | .open = rbd_open, | |
dfc5606d | 242 | .release = rbd_release, |
602adf40 YS |
243 | }; |
244 | ||
245 | /* | |
246 | * Initialize an rbd client instance. | |
247 | * We own *opt. | |
248 | */ | |
59c2be1e YS |
249 | static struct rbd_client *rbd_client_create(struct ceph_options *opt, |
250 | struct rbd_options *rbd_opts) | |
602adf40 YS |
251 | { |
252 | struct rbd_client *rbdc; | |
253 | int ret = -ENOMEM; | |
254 | ||
255 | dout("rbd_client_create\n"); | |
256 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
257 | if (!rbdc) | |
258 | goto out_opt; | |
259 | ||
260 | kref_init(&rbdc->kref); | |
261 | INIT_LIST_HEAD(&rbdc->node); | |
262 | ||
263 | rbdc->client = ceph_create_client(opt, rbdc); | |
264 | if (IS_ERR(rbdc->client)) | |
265 | goto out_rbdc; | |
28f259b7 | 266 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
602adf40 YS |
267 | |
268 | ret = ceph_open_session(rbdc->client); | |
269 | if (ret < 0) | |
270 | goto out_err; | |
271 | ||
59c2be1e YS |
272 | rbdc->rbd_opts = rbd_opts; |
273 | ||
602adf40 YS |
274 | spin_lock(&node_lock); |
275 | list_add_tail(&rbdc->node, &rbd_client_list); | |
276 | spin_unlock(&node_lock); | |
277 | ||
278 | dout("rbd_client_create created %p\n", rbdc); | |
279 | return rbdc; | |
280 | ||
281 | out_err: | |
282 | ceph_destroy_client(rbdc->client); | |
602adf40 YS |
283 | out_rbdc: |
284 | kfree(rbdc); | |
285 | out_opt: | |
28f259b7 VK |
286 | if (opt) |
287 | ceph_destroy_options(opt); | |
288 | return ERR_PTR(ret); | |
602adf40 YS |
289 | } |
290 | ||
291 | /* | |
292 | * Find a ceph client with specific addr and configuration. | |
293 | */ | |
294 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) | |
295 | { | |
296 | struct rbd_client *client_node; | |
297 | ||
298 | if (opt->flags & CEPH_OPT_NOSHARE) | |
299 | return NULL; | |
300 | ||
301 | list_for_each_entry(client_node, &rbd_client_list, node) | |
302 | if (ceph_compare_options(opt, client_node->client) == 0) | |
303 | return client_node; | |
304 | return NULL; | |
305 | } | |
306 | ||
59c2be1e YS |
307 | /* |
308 | * mount options | |
309 | */ | |
310 | enum { | |
311 | Opt_notify_timeout, | |
312 | Opt_last_int, | |
313 | /* int args above */ | |
314 | Opt_last_string, | |
315 | /* string args above */ | |
316 | }; | |
317 | ||
318 | static match_table_t rbdopt_tokens = { | |
319 | {Opt_notify_timeout, "notify_timeout=%d"}, | |
320 | /* int args above */ | |
321 | /* string args above */ | |
322 | {-1, NULL} | |
323 | }; | |
324 | ||
325 | static int parse_rbd_opts_token(char *c, void *private) | |
326 | { | |
327 | struct rbd_options *rbdopt = private; | |
328 | substring_t argstr[MAX_OPT_ARGS]; | |
329 | int token, intval, ret; | |
330 | ||
331 | token = match_token((char *)c, rbdopt_tokens, argstr); | |
332 | if (token < 0) | |
333 | return -EINVAL; | |
334 | ||
335 | if (token < Opt_last_int) { | |
336 | ret = match_int(&argstr[0], &intval); | |
337 | if (ret < 0) { | |
338 | pr_err("bad mount option arg (not int) " | |
339 | "at '%s'\n", c); | |
340 | return ret; | |
341 | } | |
342 | dout("got int token %d val %d\n", token, intval); | |
343 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
344 | dout("got string token %d val %s\n", token, | |
345 | argstr[0].from); | |
346 | } else { | |
347 | dout("got token %d\n", token); | |
348 | } | |
349 | ||
350 | switch (token) { | |
351 | case Opt_notify_timeout: | |
352 | rbdopt->notify_timeout = intval; | |
353 | break; | |
354 | default: | |
355 | BUG_ON(token); | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
602adf40 YS |
360 | /* |
361 | * Get a ceph client with specific addr and configuration, if one does | |
362 | * not exist create it. | |
363 | */ | |
364 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, | |
365 | char *options) | |
366 | { | |
367 | struct rbd_client *rbdc; | |
368 | struct ceph_options *opt; | |
369 | int ret; | |
59c2be1e YS |
370 | struct rbd_options *rbd_opts; |
371 | ||
372 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
373 | if (!rbd_opts) | |
374 | return -ENOMEM; | |
375 | ||
376 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 YS |
377 | |
378 | ret = ceph_parse_options(&opt, options, mon_addr, | |
59c2be1e | 379 | mon_addr + strlen(mon_addr), parse_rbd_opts_token, rbd_opts); |
602adf40 | 380 | if (ret < 0) |
59c2be1e | 381 | goto done_err; |
602adf40 YS |
382 | |
383 | spin_lock(&node_lock); | |
384 | rbdc = __rbd_client_find(opt); | |
385 | if (rbdc) { | |
386 | ceph_destroy_options(opt); | |
387 | ||
388 | /* using an existing client */ | |
389 | kref_get(&rbdc->kref); | |
390 | rbd_dev->rbd_client = rbdc; | |
391 | rbd_dev->client = rbdc->client; | |
392 | spin_unlock(&node_lock); | |
393 | return 0; | |
394 | } | |
395 | spin_unlock(&node_lock); | |
396 | ||
59c2be1e YS |
397 | rbdc = rbd_client_create(opt, rbd_opts); |
398 | if (IS_ERR(rbdc)) { | |
399 | ret = PTR_ERR(rbdc); | |
400 | goto done_err; | |
401 | } | |
602adf40 YS |
402 | |
403 | rbd_dev->rbd_client = rbdc; | |
404 | rbd_dev->client = rbdc->client; | |
405 | return 0; | |
59c2be1e YS |
406 | done_err: |
407 | kfree(rbd_opts); | |
408 | return ret; | |
602adf40 YS |
409 | } |
410 | ||
411 | /* | |
412 | * Destroy ceph client | |
413 | */ | |
414 | static void rbd_client_release(struct kref *kref) | |
415 | { | |
416 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
417 | ||
418 | dout("rbd_release_client %p\n", rbdc); | |
419 | spin_lock(&node_lock); | |
420 | list_del(&rbdc->node); | |
421 | spin_unlock(&node_lock); | |
422 | ||
423 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 424 | kfree(rbdc->rbd_opts); |
602adf40 YS |
425 | kfree(rbdc); |
426 | } | |
427 | ||
428 | /* | |
429 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
430 | * it. | |
431 | */ | |
432 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
433 | { | |
434 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
435 | rbd_dev->rbd_client = NULL; | |
436 | rbd_dev->client = NULL; | |
437 | } | |
438 | ||
1fec7093 YS |
439 | /* |
440 | * Destroy requests collection | |
441 | */ | |
442 | static void rbd_coll_release(struct kref *kref) | |
443 | { | |
444 | struct rbd_req_coll *coll = | |
445 | container_of(kref, struct rbd_req_coll, kref); | |
446 | ||
447 | dout("rbd_coll_release %p\n", coll); | |
448 | kfree(coll); | |
449 | } | |
602adf40 YS |
450 | |
451 | /* | |
452 | * Create a new header structure, translate header format from the on-disk | |
453 | * header. | |
454 | */ | |
455 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
456 | struct rbd_image_header_ondisk *ondisk, | |
457 | int allocated_snaps, | |
458 | gfp_t gfp_flags) | |
459 | { | |
460 | int i; | |
461 | u32 snap_count = le32_to_cpu(ondisk->snap_count); | |
462 | int ret = -ENOMEM; | |
463 | ||
464 | init_rwsem(&header->snap_rwsem); | |
602adf40 YS |
465 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
466 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + | |
467 | snap_count * | |
468 | sizeof(struct rbd_image_snap_ondisk), | |
469 | gfp_flags); | |
470 | if (!header->snapc) | |
471 | return -ENOMEM; | |
472 | if (snap_count) { | |
473 | header->snap_names = kmalloc(header->snap_names_len, | |
474 | GFP_KERNEL); | |
475 | if (!header->snap_names) | |
476 | goto err_snapc; | |
477 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
478 | GFP_KERNEL); | |
479 | if (!header->snap_sizes) | |
480 | goto err_names; | |
481 | } else { | |
482 | header->snap_names = NULL; | |
483 | header->snap_sizes = NULL; | |
484 | } | |
485 | memcpy(header->block_name, ondisk->block_name, | |
486 | sizeof(ondisk->block_name)); | |
487 | ||
488 | header->image_size = le64_to_cpu(ondisk->image_size); | |
489 | header->obj_order = ondisk->options.order; | |
490 | header->crypt_type = ondisk->options.crypt_type; | |
491 | header->comp_type = ondisk->options.comp_type; | |
492 | ||
493 | atomic_set(&header->snapc->nref, 1); | |
494 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
495 | header->snapc->num_snaps = snap_count; | |
496 | header->total_snaps = snap_count; | |
497 | ||
498 | if (snap_count && | |
499 | allocated_snaps == snap_count) { | |
500 | for (i = 0; i < snap_count; i++) { | |
501 | header->snapc->snaps[i] = | |
502 | le64_to_cpu(ondisk->snaps[i].id); | |
503 | header->snap_sizes[i] = | |
504 | le64_to_cpu(ondisk->snaps[i].image_size); | |
505 | } | |
506 | ||
507 | /* copy snapshot names */ | |
508 | memcpy(header->snap_names, &ondisk->snaps[i], | |
509 | header->snap_names_len); | |
510 | } | |
511 | ||
512 | return 0; | |
513 | ||
514 | err_names: | |
515 | kfree(header->snap_names); | |
516 | err_snapc: | |
517 | kfree(header->snapc); | |
518 | return ret; | |
519 | } | |
520 | ||
521 | static int snap_index(struct rbd_image_header *header, int snap_num) | |
522 | { | |
523 | return header->total_snaps - snap_num; | |
524 | } | |
525 | ||
526 | static u64 cur_snap_id(struct rbd_device *rbd_dev) | |
527 | { | |
528 | struct rbd_image_header *header = &rbd_dev->header; | |
529 | ||
530 | if (!rbd_dev->cur_snap) | |
531 | return 0; | |
532 | ||
533 | return header->snapc->snaps[snap_index(header, rbd_dev->cur_snap)]; | |
534 | } | |
535 | ||
536 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, | |
537 | u64 *seq, u64 *size) | |
538 | { | |
539 | int i; | |
540 | char *p = header->snap_names; | |
541 | ||
542 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { | |
543 | if (strcmp(snap_name, p) == 0) | |
544 | break; | |
545 | } | |
546 | if (i == header->total_snaps) | |
547 | return -ENOENT; | |
548 | if (seq) | |
549 | *seq = header->snapc->snaps[i]; | |
550 | ||
551 | if (size) | |
552 | *size = header->snap_sizes[i]; | |
553 | ||
554 | return i; | |
555 | } | |
556 | ||
557 | static int rbd_header_set_snap(struct rbd_device *dev, | |
558 | const char *snap_name, | |
559 | u64 *size) | |
560 | { | |
561 | struct rbd_image_header *header = &dev->header; | |
562 | struct ceph_snap_context *snapc = header->snapc; | |
563 | int ret = -ENOENT; | |
564 | ||
565 | down_write(&header->snap_rwsem); | |
566 | ||
567 | if (!snap_name || | |
568 | !*snap_name || | |
569 | strcmp(snap_name, "-") == 0 || | |
570 | strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) { | |
571 | if (header->total_snaps) | |
572 | snapc->seq = header->snap_seq; | |
573 | else | |
574 | snapc->seq = 0; | |
575 | dev->cur_snap = 0; | |
576 | dev->read_only = 0; | |
577 | if (size) | |
578 | *size = header->image_size; | |
579 | } else { | |
580 | ret = snap_by_name(header, snap_name, &snapc->seq, size); | |
581 | if (ret < 0) | |
582 | goto done; | |
583 | ||
584 | dev->cur_snap = header->total_snaps - ret; | |
585 | dev->read_only = 1; | |
586 | } | |
587 | ||
588 | ret = 0; | |
589 | done: | |
590 | up_write(&header->snap_rwsem); | |
591 | return ret; | |
592 | } | |
593 | ||
594 | static void rbd_header_free(struct rbd_image_header *header) | |
595 | { | |
596 | kfree(header->snapc); | |
597 | kfree(header->snap_names); | |
598 | kfree(header->snap_sizes); | |
599 | } | |
600 | ||
601 | /* | |
602 | * get the actual striped segment name, offset and length | |
603 | */ | |
604 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
605 | const char *block_name, | |
606 | u64 ofs, u64 len, | |
607 | char *seg_name, u64 *segofs) | |
608 | { | |
609 | u64 seg = ofs >> header->obj_order; | |
610 | ||
611 | if (seg_name) | |
612 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
613 | "%s.%012llx", block_name, seg); | |
614 | ||
615 | ofs = ofs & ((1 << header->obj_order) - 1); | |
616 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
617 | ||
618 | if (segofs) | |
619 | *segofs = ofs; | |
620 | ||
621 | return len; | |
622 | } | |
623 | ||
1fec7093 YS |
624 | static int rbd_get_num_segments(struct rbd_image_header *header, |
625 | u64 ofs, u64 len) | |
626 | { | |
627 | u64 start_seg = ofs >> header->obj_order; | |
628 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
629 | return end_seg - start_seg + 1; | |
630 | } | |
631 | ||
602adf40 YS |
632 | /* |
633 | * bio helpers | |
634 | */ | |
635 | ||
636 | static void bio_chain_put(struct bio *chain) | |
637 | { | |
638 | struct bio *tmp; | |
639 | ||
640 | while (chain) { | |
641 | tmp = chain; | |
642 | chain = chain->bi_next; | |
643 | bio_put(tmp); | |
644 | } | |
645 | } | |
646 | ||
647 | /* | |
648 | * zeros a bio chain, starting at specific offset | |
649 | */ | |
650 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
651 | { | |
652 | struct bio_vec *bv; | |
653 | unsigned long flags; | |
654 | void *buf; | |
655 | int i; | |
656 | int pos = 0; | |
657 | ||
658 | while (chain) { | |
659 | bio_for_each_segment(bv, chain, i) { | |
660 | if (pos + bv->bv_len > start_ofs) { | |
661 | int remainder = max(start_ofs - pos, 0); | |
662 | buf = bvec_kmap_irq(bv, &flags); | |
663 | memset(buf + remainder, 0, | |
664 | bv->bv_len - remainder); | |
85b5aaa6 | 665 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
666 | } |
667 | pos += bv->bv_len; | |
668 | } | |
669 | ||
670 | chain = chain->bi_next; | |
671 | } | |
672 | } | |
673 | ||
674 | /* | |
675 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
676 | * might return a bio_pair that will need to be released. | |
677 | */ | |
678 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
679 | struct bio_pair **bp, | |
680 | int len, gfp_t gfpmask) | |
681 | { | |
682 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
683 | int total = 0; | |
684 | ||
685 | if (*bp) { | |
686 | bio_pair_release(*bp); | |
687 | *bp = NULL; | |
688 | } | |
689 | ||
690 | while (old_chain && (total < len)) { | |
691 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
692 | if (!tmp) | |
693 | goto err_out; | |
694 | ||
695 | if (total + old_chain->bi_size > len) { | |
696 | struct bio_pair *bp; | |
697 | ||
698 | /* | |
699 | * this split can only happen with a single paged bio, | |
700 | * split_bio will BUG_ON if this is not the case | |
701 | */ | |
702 | dout("bio_chain_clone split! total=%d remaining=%d" | |
703 | "bi_size=%d\n", | |
704 | (int)total, (int)len-total, | |
705 | (int)old_chain->bi_size); | |
706 | ||
707 | /* split the bio. We'll release it either in the next | |
708 | call, or it will have to be released outside */ | |
709 | bp = bio_split(old_chain, (len - total) / 512ULL); | |
710 | if (!bp) | |
711 | goto err_out; | |
712 | ||
713 | __bio_clone(tmp, &bp->bio1); | |
714 | ||
715 | *next = &bp->bio2; | |
716 | } else { | |
717 | __bio_clone(tmp, old_chain); | |
718 | *next = old_chain->bi_next; | |
719 | } | |
720 | ||
721 | tmp->bi_bdev = NULL; | |
722 | gfpmask &= ~__GFP_WAIT; | |
723 | tmp->bi_next = NULL; | |
724 | ||
725 | if (!new_chain) { | |
726 | new_chain = tail = tmp; | |
727 | } else { | |
728 | tail->bi_next = tmp; | |
729 | tail = tmp; | |
730 | } | |
731 | old_chain = old_chain->bi_next; | |
732 | ||
733 | total += tmp->bi_size; | |
734 | } | |
735 | ||
736 | BUG_ON(total < len); | |
737 | ||
738 | if (tail) | |
739 | tail->bi_next = NULL; | |
740 | ||
741 | *old = old_chain; | |
742 | ||
743 | return new_chain; | |
744 | ||
745 | err_out: | |
746 | dout("bio_chain_clone with err\n"); | |
747 | bio_chain_put(new_chain); | |
748 | return NULL; | |
749 | } | |
750 | ||
751 | /* | |
752 | * helpers for osd request op vectors. | |
753 | */ | |
754 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
755 | int num_ops, | |
756 | int opcode, | |
757 | u32 payload_len) | |
758 | { | |
759 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
760 | GFP_NOIO); | |
761 | if (!*ops) | |
762 | return -ENOMEM; | |
763 | (*ops)[0].op = opcode; | |
764 | /* | |
765 | * op extent offset and length will be set later on | |
766 | * in calc_raw_layout() | |
767 | */ | |
768 | (*ops)[0].payload_len = payload_len; | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
773 | { | |
774 | kfree(ops); | |
775 | } | |
776 | ||
1fec7093 YS |
777 | static void rbd_coll_end_req_index(struct request *rq, |
778 | struct rbd_req_coll *coll, | |
779 | int index, | |
780 | int ret, u64 len) | |
781 | { | |
782 | struct request_queue *q; | |
783 | int min, max, i; | |
784 | ||
785 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", | |
786 | coll, index, ret, len); | |
787 | ||
788 | if (!rq) | |
789 | return; | |
790 | ||
791 | if (!coll) { | |
792 | blk_end_request(rq, ret, len); | |
793 | return; | |
794 | } | |
795 | ||
796 | q = rq->q; | |
797 | ||
798 | spin_lock_irq(q->queue_lock); | |
799 | coll->status[index].done = 1; | |
800 | coll->status[index].rc = ret; | |
801 | coll->status[index].bytes = len; | |
802 | max = min = coll->num_done; | |
803 | while (max < coll->total && coll->status[max].done) | |
804 | max++; | |
805 | ||
806 | for (i = min; i<max; i++) { | |
807 | __blk_end_request(rq, coll->status[i].rc, | |
808 | coll->status[i].bytes); | |
809 | coll->num_done++; | |
810 | kref_put(&coll->kref, rbd_coll_release); | |
811 | } | |
812 | spin_unlock_irq(q->queue_lock); | |
813 | } | |
814 | ||
815 | static void rbd_coll_end_req(struct rbd_request *req, | |
816 | int ret, u64 len) | |
817 | { | |
818 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
819 | } | |
820 | ||
602adf40 YS |
821 | /* |
822 | * Send ceph osd request | |
823 | */ | |
824 | static int rbd_do_request(struct request *rq, | |
825 | struct rbd_device *dev, | |
826 | struct ceph_snap_context *snapc, | |
827 | u64 snapid, | |
828 | const char *obj, u64 ofs, u64 len, | |
829 | struct bio *bio, | |
830 | struct page **pages, | |
831 | int num_pages, | |
832 | int flags, | |
833 | struct ceph_osd_req_op *ops, | |
834 | int num_reply, | |
1fec7093 YS |
835 | struct rbd_req_coll *coll, |
836 | int coll_index, | |
602adf40 | 837 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
838 | struct ceph_msg *msg), |
839 | struct ceph_osd_request **linger_req, | |
840 | u64 *ver) | |
602adf40 YS |
841 | { |
842 | struct ceph_osd_request *req; | |
843 | struct ceph_file_layout *layout; | |
844 | int ret; | |
845 | u64 bno; | |
846 | struct timespec mtime = CURRENT_TIME; | |
847 | struct rbd_request *req_data; | |
848 | struct ceph_osd_request_head *reqhead; | |
849 | struct rbd_image_header *header = &dev->header; | |
850 | ||
602adf40 | 851 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
852 | if (!req_data) { |
853 | if (coll) | |
854 | rbd_coll_end_req_index(rq, coll, coll_index, | |
855 | -ENOMEM, len); | |
856 | return -ENOMEM; | |
857 | } | |
858 | ||
859 | if (coll) { | |
860 | req_data->coll = coll; | |
861 | req_data->coll_index = coll_index; | |
862 | } | |
602adf40 | 863 | |
1fec7093 | 864 | dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs); |
602adf40 YS |
865 | |
866 | down_read(&header->snap_rwsem); | |
867 | ||
868 | req = ceph_osdc_alloc_request(&dev->client->osdc, flags, | |
869 | snapc, | |
870 | ops, | |
871 | false, | |
872 | GFP_NOIO, pages, bio); | |
4ad12621 | 873 | if (!req) { |
602adf40 | 874 | up_read(&header->snap_rwsem); |
4ad12621 | 875 | ret = -ENOMEM; |
602adf40 YS |
876 | goto done_pages; |
877 | } | |
878 | ||
879 | req->r_callback = rbd_cb; | |
880 | ||
881 | req_data->rq = rq; | |
882 | req_data->bio = bio; | |
883 | req_data->pages = pages; | |
884 | req_data->len = len; | |
885 | ||
886 | req->r_priv = req_data; | |
887 | ||
888 | reqhead = req->r_request->front.iov_base; | |
889 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
890 | ||
891 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); | |
892 | req->r_oid_len = strlen(req->r_oid); | |
893 | ||
894 | layout = &req->r_file_layout; | |
895 | memset(layout, 0, sizeof(*layout)); | |
896 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
897 | layout->fl_stripe_count = cpu_to_le32(1); | |
898 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
899 | layout->fl_pg_preferred = cpu_to_le32(-1); | |
900 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); | |
901 | ceph_calc_raw_layout(&dev->client->osdc, layout, snapid, | |
902 | ofs, &len, &bno, req, ops); | |
903 | ||
904 | ceph_osdc_build_request(req, ofs, &len, | |
905 | ops, | |
906 | snapc, | |
907 | &mtime, | |
908 | req->r_oid, req->r_oid_len); | |
909 | up_read(&header->snap_rwsem); | |
910 | ||
59c2be1e YS |
911 | if (linger_req) { |
912 | ceph_osdc_set_request_linger(&dev->client->osdc, req); | |
913 | *linger_req = req; | |
914 | } | |
915 | ||
602adf40 YS |
916 | ret = ceph_osdc_start_request(&dev->client->osdc, req, false); |
917 | if (ret < 0) | |
918 | goto done_err; | |
919 | ||
920 | if (!rbd_cb) { | |
921 | ret = ceph_osdc_wait_request(&dev->client->osdc, req); | |
59c2be1e YS |
922 | if (ver) |
923 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
1fec7093 YS |
924 | dout("reassert_ver=%lld\n", |
925 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
926 | ceph_osdc_put_request(req); |
927 | } | |
928 | return ret; | |
929 | ||
930 | done_err: | |
931 | bio_chain_put(req_data->bio); | |
932 | ceph_osdc_put_request(req); | |
933 | done_pages: | |
1fec7093 | 934 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 935 | kfree(req_data); |
602adf40 YS |
936 | return ret; |
937 | } | |
938 | ||
939 | /* | |
940 | * Ceph osd op callback | |
941 | */ | |
942 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
943 | { | |
944 | struct rbd_request *req_data = req->r_priv; | |
945 | struct ceph_osd_reply_head *replyhead; | |
946 | struct ceph_osd_op *op; | |
947 | __s32 rc; | |
948 | u64 bytes; | |
949 | int read_op; | |
950 | ||
951 | /* parse reply */ | |
952 | replyhead = msg->front.iov_base; | |
953 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
954 | op = (void *)(replyhead + 1); | |
955 | rc = le32_to_cpu(replyhead->result); | |
956 | bytes = le64_to_cpu(op->extent.length); | |
957 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); | |
958 | ||
959 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
960 | ||
961 | if (rc == -ENOENT && read_op) { | |
962 | zero_bio_chain(req_data->bio, 0); | |
963 | rc = 0; | |
964 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
965 | zero_bio_chain(req_data->bio, bytes); | |
966 | bytes = req_data->len; | |
967 | } | |
968 | ||
1fec7093 | 969 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
970 | |
971 | if (req_data->bio) | |
972 | bio_chain_put(req_data->bio); | |
973 | ||
974 | ceph_osdc_put_request(req); | |
975 | kfree(req_data); | |
976 | } | |
977 | ||
59c2be1e YS |
978 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
979 | { | |
980 | ceph_osdc_put_request(req); | |
981 | } | |
982 | ||
602adf40 YS |
983 | /* |
984 | * Do a synchronous ceph osd operation | |
985 | */ | |
986 | static int rbd_req_sync_op(struct rbd_device *dev, | |
987 | struct ceph_snap_context *snapc, | |
988 | u64 snapid, | |
989 | int opcode, | |
990 | int flags, | |
991 | struct ceph_osd_req_op *orig_ops, | |
992 | int num_reply, | |
993 | const char *obj, | |
994 | u64 ofs, u64 len, | |
59c2be1e YS |
995 | char *buf, |
996 | struct ceph_osd_request **linger_req, | |
997 | u64 *ver) | |
602adf40 YS |
998 | { |
999 | int ret; | |
1000 | struct page **pages; | |
1001 | int num_pages; | |
1002 | struct ceph_osd_req_op *ops = orig_ops; | |
1003 | u32 payload_len; | |
1004 | ||
1005 | num_pages = calc_pages_for(ofs , len); | |
1006 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1007 | if (IS_ERR(pages)) |
1008 | return PTR_ERR(pages); | |
602adf40 YS |
1009 | |
1010 | if (!orig_ops) { | |
1011 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
1012 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1013 | if (ret < 0) | |
1014 | goto done; | |
1015 | ||
1016 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
1017 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
1018 | if (ret < 0) | |
1019 | goto done_ops; | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | ret = rbd_do_request(NULL, dev, snapc, snapid, | |
1024 | obj, ofs, len, NULL, | |
1025 | pages, num_pages, | |
1026 | flags, | |
1027 | ops, | |
1028 | 2, | |
1fec7093 | 1029 | NULL, 0, |
59c2be1e YS |
1030 | NULL, |
1031 | linger_req, ver); | |
602adf40 YS |
1032 | if (ret < 0) |
1033 | goto done_ops; | |
1034 | ||
1035 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1036 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1037 | ||
1038 | done_ops: | |
1039 | if (!orig_ops) | |
1040 | rbd_destroy_ops(ops); | |
1041 | done: | |
1042 | ceph_release_page_vector(pages, num_pages); | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Do an asynchronous ceph osd operation | |
1048 | */ | |
1049 | static int rbd_do_op(struct request *rq, | |
1050 | struct rbd_device *rbd_dev , | |
1051 | struct ceph_snap_context *snapc, | |
1052 | u64 snapid, | |
1053 | int opcode, int flags, int num_reply, | |
1054 | u64 ofs, u64 len, | |
1fec7093 YS |
1055 | struct bio *bio, |
1056 | struct rbd_req_coll *coll, | |
1057 | int coll_index) | |
602adf40 YS |
1058 | { |
1059 | char *seg_name; | |
1060 | u64 seg_ofs; | |
1061 | u64 seg_len; | |
1062 | int ret; | |
1063 | struct ceph_osd_req_op *ops; | |
1064 | u32 payload_len; | |
1065 | ||
1066 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1067 | if (!seg_name) | |
1068 | return -ENOMEM; | |
1069 | ||
1070 | seg_len = rbd_get_segment(&rbd_dev->header, | |
1071 | rbd_dev->header.block_name, | |
1072 | ofs, len, | |
1073 | seg_name, &seg_ofs); | |
602adf40 YS |
1074 | |
1075 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1076 | ||
1077 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1078 | if (ret < 0) | |
1079 | goto done; | |
1080 | ||
1081 | /* we've taken care of segment sizes earlier when we | |
1082 | cloned the bios. We should never have a segment | |
1083 | truncated at this point */ | |
1084 | BUG_ON(seg_len < len); | |
1085 | ||
1086 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1087 | seg_name, seg_ofs, seg_len, | |
1088 | bio, | |
1089 | NULL, 0, | |
1090 | flags, | |
1091 | ops, | |
1092 | num_reply, | |
1fec7093 | 1093 | coll, coll_index, |
59c2be1e | 1094 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1095 | |
1096 | rbd_destroy_ops(ops); | |
602adf40 YS |
1097 | done: |
1098 | kfree(seg_name); | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Request async osd write | |
1104 | */ | |
1105 | static int rbd_req_write(struct request *rq, | |
1106 | struct rbd_device *rbd_dev, | |
1107 | struct ceph_snap_context *snapc, | |
1108 | u64 ofs, u64 len, | |
1fec7093 YS |
1109 | struct bio *bio, |
1110 | struct rbd_req_coll *coll, | |
1111 | int coll_index) | |
602adf40 YS |
1112 | { |
1113 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1114 | CEPH_OSD_OP_WRITE, | |
1115 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1116 | 2, | |
1fec7093 | 1117 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1118 | } |
1119 | ||
1120 | /* | |
1121 | * Request async osd read | |
1122 | */ | |
1123 | static int rbd_req_read(struct request *rq, | |
1124 | struct rbd_device *rbd_dev, | |
1125 | u64 snapid, | |
1126 | u64 ofs, u64 len, | |
1fec7093 YS |
1127 | struct bio *bio, |
1128 | struct rbd_req_coll *coll, | |
1129 | int coll_index) | |
602adf40 YS |
1130 | { |
1131 | return rbd_do_op(rq, rbd_dev, NULL, | |
1132 | (snapid ? snapid : CEPH_NOSNAP), | |
1133 | CEPH_OSD_OP_READ, | |
1134 | CEPH_OSD_FLAG_READ, | |
1135 | 2, | |
1fec7093 | 1136 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1137 | } |
1138 | ||
1139 | /* | |
1140 | * Request sync osd read | |
1141 | */ | |
1142 | static int rbd_req_sync_read(struct rbd_device *dev, | |
1143 | struct ceph_snap_context *snapc, | |
1144 | u64 snapid, | |
1145 | const char *obj, | |
1146 | u64 ofs, u64 len, | |
59c2be1e YS |
1147 | char *buf, |
1148 | u64 *ver) | |
602adf40 YS |
1149 | { |
1150 | return rbd_req_sync_op(dev, NULL, | |
1151 | (snapid ? snapid : CEPH_NOSNAP), | |
1152 | CEPH_OSD_OP_READ, | |
1153 | CEPH_OSD_FLAG_READ, | |
1154 | NULL, | |
59c2be1e | 1155 | 1, obj, ofs, len, buf, NULL, ver); |
602adf40 YS |
1156 | } |
1157 | ||
1158 | /* | |
59c2be1e YS |
1159 | * Request sync osd watch |
1160 | */ | |
1161 | static int rbd_req_sync_notify_ack(struct rbd_device *dev, | |
1162 | u64 ver, | |
1163 | u64 notify_id, | |
1164 | const char *obj) | |
1165 | { | |
1166 | struct ceph_osd_req_op *ops; | |
1167 | struct page **pages = NULL; | |
11f77002 SW |
1168 | int ret; |
1169 | ||
1170 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); | |
59c2be1e YS |
1171 | if (ret < 0) |
1172 | return ret; | |
1173 | ||
1174 | ops[0].watch.ver = cpu_to_le64(dev->header.obj_version); | |
1175 | ops[0].watch.cookie = notify_id; | |
1176 | ops[0].watch.flag = 0; | |
1177 | ||
1178 | ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP, | |
1179 | obj, 0, 0, NULL, | |
1180 | pages, 0, | |
1181 | CEPH_OSD_FLAG_READ, | |
1182 | ops, | |
1183 | 1, | |
1fec7093 | 1184 | NULL, 0, |
59c2be1e YS |
1185 | rbd_simple_req_cb, 0, NULL); |
1186 | ||
1187 | rbd_destroy_ops(ops); | |
1188 | return ret; | |
1189 | } | |
1190 | ||
1191 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1192 | { | |
1193 | struct rbd_device *dev = (struct rbd_device *)data; | |
1194 | if (!dev) | |
1195 | return; | |
1196 | ||
1197 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1198 | notify_id, (int)opcode); | |
1199 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1200 | __rbd_update_snaps(dev); | |
1201 | mutex_unlock(&ctl_mutex); | |
1202 | ||
1203 | rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name); | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Request sync osd watch | |
1208 | */ | |
1209 | static int rbd_req_sync_watch(struct rbd_device *dev, | |
1210 | const char *obj, | |
1211 | u64 ver) | |
1212 | { | |
1213 | struct ceph_osd_req_op *ops; | |
1214 | struct ceph_osd_client *osdc = &dev->client->osdc; | |
1215 | ||
1216 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1217 | if (ret < 0) | |
1218 | return ret; | |
1219 | ||
1220 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
1221 | (void *)dev, &dev->watch_event); | |
1222 | if (ret < 0) | |
1223 | goto fail; | |
1224 | ||
1225 | ops[0].watch.ver = cpu_to_le64(ver); | |
1226 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); | |
1227 | ops[0].watch.flag = 1; | |
1228 | ||
1229 | ret = rbd_req_sync_op(dev, NULL, | |
1230 | CEPH_NOSNAP, | |
1231 | 0, | |
1232 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1233 | ops, | |
1234 | 1, obj, 0, 0, NULL, | |
1235 | &dev->watch_request, NULL); | |
1236 | ||
1237 | if (ret < 0) | |
1238 | goto fail_event; | |
1239 | ||
1240 | rbd_destroy_ops(ops); | |
1241 | return 0; | |
1242 | ||
1243 | fail_event: | |
1244 | ceph_osdc_cancel_event(dev->watch_event); | |
1245 | dev->watch_event = NULL; | |
1246 | fail: | |
1247 | rbd_destroy_ops(ops); | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | struct rbd_notify_info { | |
1252 | struct rbd_device *dev; | |
1253 | }; | |
1254 | ||
1255 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1256 | { | |
1257 | struct rbd_device *dev = (struct rbd_device *)data; | |
1258 | if (!dev) | |
1259 | return; | |
1260 | ||
1261 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1262 | notify_id, (int)opcode); | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Request sync osd notify | |
1267 | */ | |
1268 | static int rbd_req_sync_notify(struct rbd_device *dev, | |
1269 | const char *obj) | |
1270 | { | |
1271 | struct ceph_osd_req_op *ops; | |
1272 | struct ceph_osd_client *osdc = &dev->client->osdc; | |
1273 | struct ceph_osd_event *event; | |
1274 | struct rbd_notify_info info; | |
1275 | int payload_len = sizeof(u32) + sizeof(u32); | |
1276 | int ret; | |
1277 | ||
1278 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); | |
1279 | if (ret < 0) | |
1280 | return ret; | |
1281 | ||
1282 | info.dev = dev; | |
1283 | ||
1284 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1285 | (void *)&info, &event); | |
1286 | if (ret < 0) | |
1287 | goto fail; | |
1288 | ||
1289 | ops[0].watch.ver = 1; | |
1290 | ops[0].watch.flag = 1; | |
1291 | ops[0].watch.cookie = event->cookie; | |
1292 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1293 | ops[0].watch.timeout = 12; | |
1294 | ||
1295 | ret = rbd_req_sync_op(dev, NULL, | |
1296 | CEPH_NOSNAP, | |
1297 | 0, | |
1298 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1299 | ops, | |
1300 | 1, obj, 0, 0, NULL, NULL, NULL); | |
1301 | if (ret < 0) | |
1302 | goto fail_event; | |
1303 | ||
1304 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1305 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1306 | rbd_destroy_ops(ops); | |
1307 | return 0; | |
1308 | ||
1309 | fail_event: | |
1310 | ceph_osdc_cancel_event(event); | |
1311 | fail: | |
1312 | rbd_destroy_ops(ops); | |
1313 | return ret; | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * Request sync osd rollback | |
602adf40 YS |
1318 | */ |
1319 | static int rbd_req_sync_rollback_obj(struct rbd_device *dev, | |
1320 | u64 snapid, | |
1321 | const char *obj) | |
1322 | { | |
1323 | struct ceph_osd_req_op *ops; | |
1324 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_ROLLBACK, 0); | |
1325 | if (ret < 0) | |
1326 | return ret; | |
1327 | ||
1328 | ops[0].snap.snapid = snapid; | |
1329 | ||
1330 | ret = rbd_req_sync_op(dev, NULL, | |
1331 | CEPH_NOSNAP, | |
1332 | 0, | |
1333 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1334 | ops, | |
59c2be1e | 1335 | 1, obj, 0, 0, NULL, NULL, NULL); |
602adf40 YS |
1336 | |
1337 | rbd_destroy_ops(ops); | |
1338 | ||
602adf40 YS |
1339 | return ret; |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * Request sync osd read | |
1344 | */ | |
1345 | static int rbd_req_sync_exec(struct rbd_device *dev, | |
1346 | const char *obj, | |
1347 | const char *cls, | |
1348 | const char *method, | |
1349 | const char *data, | |
59c2be1e YS |
1350 | int len, |
1351 | u64 *ver) | |
602adf40 YS |
1352 | { |
1353 | struct ceph_osd_req_op *ops; | |
1354 | int cls_len = strlen(cls); | |
1355 | int method_len = strlen(method); | |
1356 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
1357 | cls_len + method_len + len); | |
1358 | if (ret < 0) | |
1359 | return ret; | |
1360 | ||
1361 | ops[0].cls.class_name = cls; | |
1362 | ops[0].cls.class_len = (__u8)cls_len; | |
1363 | ops[0].cls.method_name = method; | |
1364 | ops[0].cls.method_len = (__u8)method_len; | |
1365 | ops[0].cls.argc = 0; | |
1366 | ops[0].cls.indata = data; | |
1367 | ops[0].cls.indata_len = len; | |
1368 | ||
1369 | ret = rbd_req_sync_op(dev, NULL, | |
1370 | CEPH_NOSNAP, | |
1371 | 0, | |
1372 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1373 | ops, | |
59c2be1e | 1374 | 1, obj, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1375 | |
1376 | rbd_destroy_ops(ops); | |
1377 | ||
1378 | dout("cls_exec returned %d\n", ret); | |
1379 | return ret; | |
1380 | } | |
1381 | ||
1fec7093 YS |
1382 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1383 | { | |
1384 | struct rbd_req_coll *coll = | |
1385 | kzalloc(sizeof(struct rbd_req_coll) + | |
1386 | sizeof(struct rbd_req_status) * num_reqs, | |
1387 | GFP_ATOMIC); | |
1388 | ||
1389 | if (!coll) | |
1390 | return NULL; | |
1391 | coll->total = num_reqs; | |
1392 | kref_init(&coll->kref); | |
1393 | return coll; | |
1394 | } | |
1395 | ||
602adf40 YS |
1396 | /* |
1397 | * block device queue callback | |
1398 | */ | |
1399 | static void rbd_rq_fn(struct request_queue *q) | |
1400 | { | |
1401 | struct rbd_device *rbd_dev = q->queuedata; | |
1402 | struct request *rq; | |
1403 | struct bio_pair *bp = NULL; | |
1404 | ||
1405 | rq = blk_fetch_request(q); | |
1406 | ||
1407 | while (1) { | |
1408 | struct bio *bio; | |
1409 | struct bio *rq_bio, *next_bio = NULL; | |
1410 | bool do_write; | |
1411 | int size, op_size = 0; | |
1412 | u64 ofs; | |
1fec7093 YS |
1413 | int num_segs, cur_seg = 0; |
1414 | struct rbd_req_coll *coll; | |
602adf40 YS |
1415 | |
1416 | /* peek at request from block layer */ | |
1417 | if (!rq) | |
1418 | break; | |
1419 | ||
1420 | dout("fetched request\n"); | |
1421 | ||
1422 | /* filter out block requests we don't understand */ | |
1423 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1424 | __blk_end_request_all(rq, 0); | |
1425 | goto next; | |
1426 | } | |
1427 | ||
1428 | /* deduce our operation (read, write) */ | |
1429 | do_write = (rq_data_dir(rq) == WRITE); | |
1430 | ||
1431 | size = blk_rq_bytes(rq); | |
1432 | ofs = blk_rq_pos(rq) * 512ULL; | |
1433 | rq_bio = rq->bio; | |
1434 | if (do_write && rbd_dev->read_only) { | |
1435 | __blk_end_request_all(rq, -EROFS); | |
1436 | goto next; | |
1437 | } | |
1438 | ||
1439 | spin_unlock_irq(q->queue_lock); | |
1440 | ||
1441 | dout("%s 0x%x bytes at 0x%llx\n", | |
1442 | do_write ? "write" : "read", | |
1443 | size, blk_rq_pos(rq) * 512ULL); | |
1444 | ||
1fec7093 YS |
1445 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1446 | coll = rbd_alloc_coll(num_segs); | |
1447 | if (!coll) { | |
1448 | spin_lock_irq(q->queue_lock); | |
1449 | __blk_end_request_all(rq, -ENOMEM); | |
1450 | goto next; | |
1451 | } | |
1452 | ||
602adf40 YS |
1453 | do { |
1454 | /* a bio clone to be passed down to OSD req */ | |
1455 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1456 | op_size = rbd_get_segment(&rbd_dev->header, | |
1457 | rbd_dev->header.block_name, | |
1458 | ofs, size, | |
1459 | NULL, NULL); | |
1fec7093 | 1460 | kref_get(&coll->kref); |
602adf40 YS |
1461 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1462 | op_size, GFP_ATOMIC); | |
1463 | if (!bio) { | |
1fec7093 YS |
1464 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1465 | -ENOMEM, op_size); | |
1466 | goto next_seg; | |
602adf40 YS |
1467 | } |
1468 | ||
1fec7093 | 1469 | |
602adf40 YS |
1470 | /* init OSD command: write or read */ |
1471 | if (do_write) | |
1472 | rbd_req_write(rq, rbd_dev, | |
1473 | rbd_dev->header.snapc, | |
1474 | ofs, | |
1fec7093 YS |
1475 | op_size, bio, |
1476 | coll, cur_seg); | |
602adf40 YS |
1477 | else |
1478 | rbd_req_read(rq, rbd_dev, | |
1479 | cur_snap_id(rbd_dev), | |
1480 | ofs, | |
1fec7093 YS |
1481 | op_size, bio, |
1482 | coll, cur_seg); | |
602adf40 | 1483 | |
1fec7093 | 1484 | next_seg: |
602adf40 YS |
1485 | size -= op_size; |
1486 | ofs += op_size; | |
1487 | ||
1fec7093 | 1488 | cur_seg++; |
602adf40 YS |
1489 | rq_bio = next_bio; |
1490 | } while (size > 0); | |
1fec7093 | 1491 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1492 | |
1493 | if (bp) | |
1494 | bio_pair_release(bp); | |
602adf40 YS |
1495 | spin_lock_irq(q->queue_lock); |
1496 | next: | |
1497 | rq = blk_fetch_request(q); | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1503 | * multiple osd objects. One exception would be with a single page bios, | |
1504 | * which we handle later at bio_chain_clone | |
1505 | */ | |
1506 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1507 | struct bio_vec *bvec) | |
1508 | { | |
1509 | struct rbd_device *rbd_dev = q->queuedata; | |
1510 | unsigned int chunk_sectors = 1 << (rbd_dev->header.obj_order - 9); | |
1511 | sector_t sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1512 | unsigned int bio_sectors = bmd->bi_size >> 9; | |
1513 | int max; | |
1514 | ||
1515 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) | |
1516 | + bio_sectors)) << 9; | |
1517 | if (max < 0) | |
1518 | max = 0; /* bio_add cannot handle a negative return */ | |
1519 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1520 | return bvec->bv_len; | |
1521 | return max; | |
1522 | } | |
1523 | ||
1524 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1525 | { | |
1526 | struct gendisk *disk = rbd_dev->disk; | |
1527 | ||
1528 | if (!disk) | |
1529 | return; | |
1530 | ||
1531 | rbd_header_free(&rbd_dev->header); | |
1532 | ||
1533 | if (disk->flags & GENHD_FL_UP) | |
1534 | del_gendisk(disk); | |
1535 | if (disk->queue) | |
1536 | blk_cleanup_queue(disk->queue); | |
1537 | put_disk(disk); | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * reload the ondisk the header | |
1542 | */ | |
1543 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1544 | struct rbd_image_header *header) | |
1545 | { | |
1546 | ssize_t rc; | |
1547 | struct rbd_image_header_ondisk *dh; | |
1548 | int snap_count = 0; | |
1549 | u64 snap_names_len = 0; | |
59c2be1e | 1550 | u64 ver; |
602adf40 YS |
1551 | |
1552 | while (1) { | |
1553 | int len = sizeof(*dh) + | |
1554 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1555 | snap_names_len; | |
1556 | ||
1557 | rc = -ENOMEM; | |
1558 | dh = kmalloc(len, GFP_KERNEL); | |
1559 | if (!dh) | |
1560 | return -ENOMEM; | |
1561 | ||
1562 | rc = rbd_req_sync_read(rbd_dev, | |
1563 | NULL, CEPH_NOSNAP, | |
1564 | rbd_dev->obj_md_name, | |
1565 | 0, len, | |
59c2be1e | 1566 | (char *)dh, &ver); |
602adf40 YS |
1567 | if (rc < 0) |
1568 | goto out_dh; | |
1569 | ||
1570 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
1571 | if (rc < 0) | |
1572 | goto out_dh; | |
1573 | ||
1574 | if (snap_count != header->total_snaps) { | |
1575 | snap_count = header->total_snaps; | |
1576 | snap_names_len = header->snap_names_len; | |
1577 | rbd_header_free(header); | |
1578 | kfree(dh); | |
1579 | continue; | |
1580 | } | |
1581 | break; | |
1582 | } | |
59c2be1e | 1583 | header->obj_version = ver; |
602adf40 YS |
1584 | |
1585 | out_dh: | |
1586 | kfree(dh); | |
1587 | return rc; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * create a snapshot | |
1592 | */ | |
1593 | static int rbd_header_add_snap(struct rbd_device *dev, | |
1594 | const char *snap_name, | |
1595 | gfp_t gfp_flags) | |
1596 | { | |
1597 | int name_len = strlen(snap_name); | |
1598 | u64 new_snapid; | |
1599 | int ret; | |
1600 | void *data, *data_start, *data_end; | |
59c2be1e | 1601 | u64 ver; |
602adf40 YS |
1602 | |
1603 | /* we should create a snapshot only if we're pointing at the head */ | |
1604 | if (dev->cur_snap) | |
1605 | return -EINVAL; | |
1606 | ||
1607 | ret = ceph_monc_create_snapid(&dev->client->monc, dev->poolid, | |
1608 | &new_snapid); | |
1609 | dout("created snapid=%lld\n", new_snapid); | |
1610 | if (ret < 0) | |
1611 | return ret; | |
1612 | ||
1613 | data = kmalloc(name_len + 16, gfp_flags); | |
1614 | if (!data) | |
1615 | return -ENOMEM; | |
1616 | ||
1617 | data_start = data; | |
1618 | data_end = data + name_len + 16; | |
1619 | ||
1620 | ceph_encode_string_safe(&data, data_end, snap_name, name_len, bad); | |
1621 | ceph_encode_64_safe(&data, data_end, new_snapid, bad); | |
1622 | ||
1623 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", | |
59c2be1e | 1624 | data_start, data - data_start, &ver); |
602adf40 YS |
1625 | |
1626 | kfree(data_start); | |
1627 | ||
1628 | if (ret < 0) | |
1629 | return ret; | |
1630 | ||
1631 | dev->header.snapc->seq = new_snapid; | |
1632 | ||
1633 | return 0; | |
1634 | bad: | |
1635 | return -ERANGE; | |
1636 | } | |
1637 | ||
dfc5606d YS |
1638 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1639 | { | |
1640 | struct rbd_snap *snap; | |
1641 | ||
1642 | while (!list_empty(&rbd_dev->snaps)) { | |
1643 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); | |
1644 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1645 | } | |
1646 | } | |
1647 | ||
602adf40 YS |
1648 | /* |
1649 | * only read the first part of the ondisk header, without the snaps info | |
1650 | */ | |
dfc5606d | 1651 | static int __rbd_update_snaps(struct rbd_device *rbd_dev) |
602adf40 YS |
1652 | { |
1653 | int ret; | |
1654 | struct rbd_image_header h; | |
1655 | u64 snap_seq; | |
59c2be1e | 1656 | int follow_seq = 0; |
602adf40 YS |
1657 | |
1658 | ret = rbd_read_header(rbd_dev, &h); | |
1659 | if (ret < 0) | |
1660 | return ret; | |
1661 | ||
1662 | down_write(&rbd_dev->header.snap_rwsem); | |
1663 | ||
1664 | snap_seq = rbd_dev->header.snapc->seq; | |
59c2be1e YS |
1665 | if (rbd_dev->header.total_snaps && |
1666 | rbd_dev->header.snapc->snaps[0] == snap_seq) | |
1667 | /* pointing at the head, will need to follow that | |
1668 | if head moves */ | |
1669 | follow_seq = 1; | |
602adf40 YS |
1670 | |
1671 | kfree(rbd_dev->header.snapc); | |
1672 | kfree(rbd_dev->header.snap_names); | |
1673 | kfree(rbd_dev->header.snap_sizes); | |
1674 | ||
1675 | rbd_dev->header.total_snaps = h.total_snaps; | |
1676 | rbd_dev->header.snapc = h.snapc; | |
1677 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1678 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1679 | rbd_dev->header.snap_sizes = h.snap_sizes; |
59c2be1e YS |
1680 | if (follow_seq) |
1681 | rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; | |
1682 | else | |
1683 | rbd_dev->header.snapc->seq = snap_seq; | |
602adf40 | 1684 | |
dfc5606d YS |
1685 | ret = __rbd_init_snaps_header(rbd_dev); |
1686 | ||
602adf40 YS |
1687 | up_write(&rbd_dev->header.snap_rwsem); |
1688 | ||
dfc5606d | 1689 | return ret; |
602adf40 YS |
1690 | } |
1691 | ||
1692 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1693 | { | |
1694 | struct gendisk *disk; | |
1695 | struct request_queue *q; | |
1696 | int rc; | |
1697 | u64 total_size = 0; | |
1698 | ||
1699 | /* contact OSD, request size info about the object being mapped */ | |
1700 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1701 | if (rc) | |
1702 | return rc; | |
1703 | ||
dfc5606d YS |
1704 | /* no need to lock here, as rbd_dev is not registered yet */ |
1705 | rc = __rbd_init_snaps_header(rbd_dev); | |
1706 | if (rc) | |
1707 | return rc; | |
1708 | ||
602adf40 YS |
1709 | rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); |
1710 | if (rc) | |
1711 | return rc; | |
1712 | ||
1713 | /* create gendisk info */ | |
1714 | rc = -ENOMEM; | |
1715 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1716 | if (!disk) | |
1717 | goto out; | |
1718 | ||
1719 | sprintf(disk->disk_name, DRV_NAME "%d", rbd_dev->id); | |
1720 | disk->major = rbd_dev->major; | |
1721 | disk->first_minor = 0; | |
1722 | disk->fops = &rbd_bd_ops; | |
1723 | disk->private_data = rbd_dev; | |
1724 | ||
1725 | /* init rq */ | |
1726 | rc = -ENOMEM; | |
1727 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1728 | if (!q) | |
1729 | goto out_disk; | |
1730 | blk_queue_merge_bvec(q, rbd_merge_bvec); | |
1731 | disk->queue = q; | |
1732 | ||
1733 | q->queuedata = rbd_dev; | |
1734 | ||
1735 | rbd_dev->disk = disk; | |
1736 | rbd_dev->q = q; | |
1737 | ||
1738 | /* finally, announce the disk to the world */ | |
1739 | set_capacity(disk, total_size / 512ULL); | |
1740 | add_disk(disk); | |
1741 | ||
1742 | pr_info("%s: added with size 0x%llx\n", | |
1743 | disk->disk_name, (unsigned long long)total_size); | |
1744 | return 0; | |
1745 | ||
1746 | out_disk: | |
1747 | put_disk(disk); | |
1748 | out: | |
1749 | return rc; | |
1750 | } | |
1751 | ||
dfc5606d YS |
1752 | /* |
1753 | sysfs | |
1754 | */ | |
1755 | ||
1756 | static ssize_t rbd_size_show(struct device *dev, | |
1757 | struct device_attribute *attr, char *buf) | |
1758 | { | |
1759 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1760 | ||
1761 | return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); | |
1762 | } | |
1763 | ||
1764 | static ssize_t rbd_major_show(struct device *dev, | |
1765 | struct device_attribute *attr, char *buf) | |
1766 | { | |
1767 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
602adf40 | 1768 | |
dfc5606d YS |
1769 | return sprintf(buf, "%d\n", rbd_dev->major); |
1770 | } | |
1771 | ||
1772 | static ssize_t rbd_client_id_show(struct device *dev, | |
1773 | struct device_attribute *attr, char *buf) | |
602adf40 | 1774 | { |
dfc5606d YS |
1775 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1776 | ||
1777 | return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client)); | |
602adf40 YS |
1778 | } |
1779 | ||
dfc5606d YS |
1780 | static ssize_t rbd_pool_show(struct device *dev, |
1781 | struct device_attribute *attr, char *buf) | |
602adf40 | 1782 | { |
dfc5606d YS |
1783 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1784 | ||
1785 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1786 | } | |
1787 | ||
1788 | static ssize_t rbd_name_show(struct device *dev, | |
1789 | struct device_attribute *attr, char *buf) | |
1790 | { | |
1791 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1792 | ||
1793 | return sprintf(buf, "%s\n", rbd_dev->obj); | |
1794 | } | |
1795 | ||
1796 | static ssize_t rbd_snap_show(struct device *dev, | |
1797 | struct device_attribute *attr, | |
1798 | char *buf) | |
1799 | { | |
1800 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1801 | ||
1802 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1803 | } | |
1804 | ||
1805 | static ssize_t rbd_image_refresh(struct device *dev, | |
1806 | struct device_attribute *attr, | |
1807 | const char *buf, | |
1808 | size_t size) | |
1809 | { | |
1810 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1811 | int rc; | |
1812 | int ret = size; | |
602adf40 YS |
1813 | |
1814 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1815 | ||
dfc5606d YS |
1816 | rc = __rbd_update_snaps(rbd_dev); |
1817 | if (rc < 0) | |
1818 | ret = rc; | |
602adf40 | 1819 | |
dfc5606d YS |
1820 | mutex_unlock(&ctl_mutex); |
1821 | return ret; | |
1822 | } | |
602adf40 | 1823 | |
dfc5606d YS |
1824 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1825 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1826 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1827 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
1828 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); | |
1829 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1830 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1831 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
1832 | static DEVICE_ATTR(rollback_snap, S_IWUSR, NULL, rbd_snap_rollback); | |
1833 | ||
1834 | static struct attribute *rbd_attrs[] = { | |
1835 | &dev_attr_size.attr, | |
1836 | &dev_attr_major.attr, | |
1837 | &dev_attr_client_id.attr, | |
1838 | &dev_attr_pool.attr, | |
1839 | &dev_attr_name.attr, | |
1840 | &dev_attr_current_snap.attr, | |
1841 | &dev_attr_refresh.attr, | |
1842 | &dev_attr_create_snap.attr, | |
1843 | &dev_attr_rollback_snap.attr, | |
1844 | NULL | |
1845 | }; | |
1846 | ||
1847 | static struct attribute_group rbd_attr_group = { | |
1848 | .attrs = rbd_attrs, | |
1849 | }; | |
1850 | ||
1851 | static const struct attribute_group *rbd_attr_groups[] = { | |
1852 | &rbd_attr_group, | |
1853 | NULL | |
1854 | }; | |
1855 | ||
1856 | static void rbd_sysfs_dev_release(struct device *dev) | |
1857 | { | |
1858 | } | |
1859 | ||
1860 | static struct device_type rbd_device_type = { | |
1861 | .name = "rbd", | |
1862 | .groups = rbd_attr_groups, | |
1863 | .release = rbd_sysfs_dev_release, | |
1864 | }; | |
1865 | ||
1866 | ||
1867 | /* | |
1868 | sysfs - snapshots | |
1869 | */ | |
1870 | ||
1871 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1872 | struct device_attribute *attr, | |
1873 | char *buf) | |
1874 | { | |
1875 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1876 | ||
1877 | return sprintf(buf, "%lld\n", (long long)snap->size); | |
1878 | } | |
1879 | ||
1880 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1881 | struct device_attribute *attr, | |
1882 | char *buf) | |
1883 | { | |
1884 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1885 | ||
1886 | return sprintf(buf, "%lld\n", (long long)snap->id); | |
1887 | } | |
1888 | ||
1889 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1890 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1891 | ||
1892 | static struct attribute *rbd_snap_attrs[] = { | |
1893 | &dev_attr_snap_size.attr, | |
1894 | &dev_attr_snap_id.attr, | |
1895 | NULL, | |
1896 | }; | |
1897 | ||
1898 | static struct attribute_group rbd_snap_attr_group = { | |
1899 | .attrs = rbd_snap_attrs, | |
1900 | }; | |
1901 | ||
1902 | static void rbd_snap_dev_release(struct device *dev) | |
1903 | { | |
1904 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1905 | kfree(snap->name); | |
1906 | kfree(snap); | |
1907 | } | |
1908 | ||
1909 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
1910 | &rbd_snap_attr_group, | |
1911 | NULL | |
1912 | }; | |
1913 | ||
1914 | static struct device_type rbd_snap_device_type = { | |
1915 | .groups = rbd_snap_attr_groups, | |
1916 | .release = rbd_snap_dev_release, | |
1917 | }; | |
1918 | ||
1919 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
1920 | struct rbd_snap *snap) | |
1921 | { | |
1922 | list_del(&snap->node); | |
1923 | device_unregister(&snap->dev); | |
1924 | } | |
1925 | ||
1926 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
1927 | struct rbd_snap *snap, | |
1928 | struct device *parent) | |
1929 | { | |
1930 | struct device *dev = &snap->dev; | |
1931 | int ret; | |
1932 | ||
1933 | dev->type = &rbd_snap_device_type; | |
1934 | dev->parent = parent; | |
1935 | dev->release = rbd_snap_dev_release; | |
1936 | dev_set_name(dev, "snap_%s", snap->name); | |
1937 | ret = device_register(dev); | |
1938 | ||
1939 | return ret; | |
1940 | } | |
1941 | ||
1942 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
1943 | int i, const char *name, | |
1944 | struct rbd_snap **snapp) | |
1945 | { | |
1946 | int ret; | |
1947 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
1948 | if (!snap) | |
1949 | return -ENOMEM; | |
1950 | snap->name = kstrdup(name, GFP_KERNEL); | |
1951 | snap->size = rbd_dev->header.snap_sizes[i]; | |
1952 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
1953 | if (device_is_registered(&rbd_dev->dev)) { | |
1954 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
1955 | &rbd_dev->dev); | |
1956 | if (ret < 0) | |
1957 | goto err; | |
1958 | } | |
1959 | *snapp = snap; | |
1960 | return 0; | |
1961 | err: | |
1962 | kfree(snap->name); | |
1963 | kfree(snap); | |
1964 | return ret; | |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * search for the previous snap in a null delimited string list | |
1969 | */ | |
1970 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
1971 | { | |
1972 | if (name < start + 2) | |
1973 | return NULL; | |
1974 | ||
1975 | name -= 2; | |
1976 | while (*name) { | |
1977 | if (name == start) | |
1978 | return start; | |
1979 | name--; | |
1980 | } | |
1981 | return name + 1; | |
1982 | } | |
1983 | ||
1984 | /* | |
1985 | * compare the old list of snapshots that we have to what's in the header | |
1986 | * and update it accordingly. Note that the header holds the snapshots | |
1987 | * in a reverse order (from newest to oldest) and we need to go from | |
1988 | * older to new so that we don't get a duplicate snap name when | |
1989 | * doing the process (e.g., removed snapshot and recreated a new | |
1990 | * one with the same name. | |
1991 | */ | |
1992 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
1993 | { | |
1994 | const char *name, *first_name; | |
1995 | int i = rbd_dev->header.total_snaps; | |
1996 | struct rbd_snap *snap, *old_snap = NULL; | |
1997 | int ret; | |
1998 | struct list_head *p, *n; | |
1999 | ||
2000 | first_name = rbd_dev->header.snap_names; | |
2001 | name = first_name + rbd_dev->header.snap_names_len; | |
2002 | ||
2003 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2004 | u64 cur_id; | |
2005 | ||
2006 | old_snap = list_entry(p, struct rbd_snap, node); | |
2007 | ||
2008 | if (i) | |
2009 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2010 | ||
2011 | if (!i || old_snap->id < cur_id) { | |
2012 | /* old_snap->id was skipped, thus was removed */ | |
2013 | __rbd_remove_snap_dev(rbd_dev, old_snap); | |
2014 | continue; | |
2015 | } | |
2016 | if (old_snap->id == cur_id) { | |
2017 | /* we have this snapshot already */ | |
2018 | i--; | |
2019 | name = rbd_prev_snap_name(name, first_name); | |
2020 | continue; | |
2021 | } | |
2022 | for (; i > 0; | |
2023 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2024 | if (!name) { | |
2025 | WARN_ON(1); | |
2026 | return -EINVAL; | |
2027 | } | |
2028 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2029 | /* snapshot removal? handle it above */ | |
2030 | if (cur_id >= old_snap->id) | |
2031 | break; | |
2032 | /* a new snapshot */ | |
2033 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2034 | if (ret < 0) | |
2035 | return ret; | |
2036 | ||
2037 | /* note that we add it backward so using n and not p */ | |
2038 | list_add(&snap->node, n); | |
2039 | p = &snap->node; | |
2040 | } | |
2041 | } | |
2042 | /* we're done going over the old snap list, just add what's left */ | |
2043 | for (; i > 0; i--) { | |
2044 | name = rbd_prev_snap_name(name, first_name); | |
2045 | if (!name) { | |
2046 | WARN_ON(1); | |
2047 | return -EINVAL; | |
2048 | } | |
2049 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2050 | if (ret < 0) | |
2051 | return ret; | |
2052 | list_add(&snap->node, &rbd_dev->snaps); | |
2053 | } | |
2054 | ||
2055 | return 0; | |
2056 | } | |
2057 | ||
2058 | ||
2059 | static void rbd_root_dev_release(struct device *dev) | |
2060 | { | |
2061 | } | |
2062 | ||
2063 | static struct device rbd_root_dev = { | |
2064 | .init_name = "rbd", | |
2065 | .release = rbd_root_dev_release, | |
2066 | }; | |
2067 | ||
2068 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) | |
2069 | { | |
2070 | int ret = -ENOMEM; | |
2071 | struct device *dev; | |
2072 | struct rbd_snap *snap; | |
2073 | ||
2074 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2075 | dev = &rbd_dev->dev; | |
2076 | ||
2077 | dev->bus = &rbd_bus_type; | |
2078 | dev->type = &rbd_device_type; | |
2079 | dev->parent = &rbd_root_dev; | |
2080 | dev->release = rbd_dev_release; | |
2081 | dev_set_name(dev, "%d", rbd_dev->id); | |
2082 | ret = device_register(dev); | |
2083 | if (ret < 0) | |
2084 | goto done_free; | |
2085 | ||
2086 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2087 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2088 | &rbd_dev->dev); | |
2089 | if (ret < 0) | |
602adf40 YS |
2090 | break; |
2091 | } | |
2092 | ||
2093 | mutex_unlock(&ctl_mutex); | |
dfc5606d YS |
2094 | return 0; |
2095 | done_free: | |
2096 | mutex_unlock(&ctl_mutex); | |
2097 | return ret; | |
602adf40 YS |
2098 | } |
2099 | ||
dfc5606d YS |
2100 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2101 | { | |
2102 | device_unregister(&rbd_dev->dev); | |
2103 | } | |
2104 | ||
59c2be1e YS |
2105 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2106 | { | |
2107 | int ret, rc; | |
2108 | ||
2109 | do { | |
2110 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name, | |
2111 | rbd_dev->header.obj_version); | |
2112 | if (ret == -ERANGE) { | |
2113 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2114 | rc = __rbd_update_snaps(rbd_dev); | |
2115 | mutex_unlock(&ctl_mutex); | |
2116 | if (rc < 0) | |
2117 | return rc; | |
2118 | } | |
2119 | } while (ret == -ERANGE); | |
2120 | ||
2121 | return ret; | |
2122 | } | |
2123 | ||
2124 | static ssize_t rbd_add(struct bus_type *bus, | |
2125 | const char *buf, | |
2126 | size_t count) | |
602adf40 YS |
2127 | { |
2128 | struct ceph_osd_client *osdc; | |
2129 | struct rbd_device *rbd_dev; | |
2130 | ssize_t rc = -ENOMEM; | |
2131 | int irc, new_id = 0; | |
2132 | struct list_head *tmp; | |
2133 | char *mon_dev_name; | |
2134 | char *options; | |
2135 | ||
2136 | if (!try_module_get(THIS_MODULE)) | |
2137 | return -ENODEV; | |
2138 | ||
2139 | mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
2140 | if (!mon_dev_name) | |
2141 | goto err_out_mod; | |
2142 | ||
2143 | options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
2144 | if (!options) | |
2145 | goto err_mon_dev; | |
2146 | ||
2147 | /* new rbd_device object */ | |
2148 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); | |
2149 | if (!rbd_dev) | |
2150 | goto err_out_opt; | |
2151 | ||
2152 | /* static rbd_device initialization */ | |
2153 | spin_lock_init(&rbd_dev->lock); | |
2154 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2155 | INIT_LIST_HEAD(&rbd_dev->snaps); |
602adf40 YS |
2156 | |
2157 | /* generate unique id: find highest unique id, add one */ | |
2158 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2159 | ||
2160 | list_for_each(tmp, &rbd_dev_list) { | |
2161 | struct rbd_device *rbd_dev; | |
2162 | ||
2163 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2164 | if (rbd_dev->id >= new_id) | |
2165 | new_id = rbd_dev->id + 1; | |
2166 | } | |
2167 | ||
2168 | rbd_dev->id = new_id; | |
2169 | ||
2170 | /* add to global list */ | |
2171 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2172 | ||
2173 | /* parse add command */ | |
2174 | if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
2175 | "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
2176 | "%" __stringify(RBD_MAX_POOL_NAME_LEN) "s " | |
2177 | "%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s" | |
2178 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
2179 | mon_dev_name, options, rbd_dev->pool_name, | |
2180 | rbd_dev->obj, rbd_dev->snap_name) < 4) { | |
2181 | rc = -EINVAL; | |
2182 | goto err_out_slot; | |
2183 | } | |
2184 | ||
2185 | if (rbd_dev->snap_name[0] == 0) | |
2186 | rbd_dev->snap_name[0] = '-'; | |
2187 | ||
2188 | rbd_dev->obj_len = strlen(rbd_dev->obj); | |
2189 | snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s", | |
2190 | rbd_dev->obj, RBD_SUFFIX); | |
2191 | ||
2192 | /* initialize rest of new object */ | |
2193 | snprintf(rbd_dev->name, DEV_NAME_LEN, DRV_NAME "%d", rbd_dev->id); | |
2194 | rc = rbd_get_client(rbd_dev, mon_dev_name, options); | |
2195 | if (rc < 0) | |
2196 | goto err_out_slot; | |
2197 | ||
2198 | mutex_unlock(&ctl_mutex); | |
2199 | ||
2200 | /* pick the pool */ | |
2201 | osdc = &rbd_dev->client->osdc; | |
2202 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); | |
2203 | if (rc < 0) | |
2204 | goto err_out_client; | |
2205 | rbd_dev->poolid = rc; | |
2206 | ||
2207 | /* register our block device */ | |
2208 | irc = register_blkdev(0, rbd_dev->name); | |
2209 | if (irc < 0) { | |
2210 | rc = irc; | |
2211 | goto err_out_client; | |
2212 | } | |
2213 | rbd_dev->major = irc; | |
2214 | ||
dfc5606d YS |
2215 | rc = rbd_bus_add_dev(rbd_dev); |
2216 | if (rc) | |
766fc439 YS |
2217 | goto err_out_blkdev; |
2218 | ||
602adf40 YS |
2219 | /* set up and announce blkdev mapping */ |
2220 | rc = rbd_init_disk(rbd_dev); | |
2221 | if (rc) | |
766fc439 | 2222 | goto err_out_bus; |
602adf40 | 2223 | |
59c2be1e YS |
2224 | rc = rbd_init_watch_dev(rbd_dev); |
2225 | if (rc) | |
2226 | goto err_out_bus; | |
2227 | ||
602adf40 YS |
2228 | return count; |
2229 | ||
766fc439 YS |
2230 | err_out_bus: |
2231 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2232 | list_del_init(&rbd_dev->node); | |
2233 | mutex_unlock(&ctl_mutex); | |
2234 | ||
2235 | /* this will also clean up rest of rbd_dev stuff */ | |
2236 | ||
2237 | rbd_bus_del_dev(rbd_dev); | |
2238 | kfree(options); | |
2239 | kfree(mon_dev_name); | |
2240 | return rc; | |
2241 | ||
602adf40 YS |
2242 | err_out_blkdev: |
2243 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2244 | err_out_client: | |
2245 | rbd_put_client(rbd_dev); | |
2246 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2247 | err_out_slot: | |
2248 | list_del_init(&rbd_dev->node); | |
2249 | mutex_unlock(&ctl_mutex); | |
2250 | ||
2251 | kfree(rbd_dev); | |
2252 | err_out_opt: | |
2253 | kfree(options); | |
2254 | err_mon_dev: | |
2255 | kfree(mon_dev_name); | |
2256 | err_out_mod: | |
2257 | dout("Error adding device %s\n", buf); | |
2258 | module_put(THIS_MODULE); | |
2259 | return rc; | |
2260 | } | |
2261 | ||
2262 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
2263 | { | |
2264 | struct list_head *tmp; | |
2265 | struct rbd_device *rbd_dev; | |
2266 | ||
2267 | list_for_each(tmp, &rbd_dev_list) { | |
2268 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2269 | if (rbd_dev->id == id) | |
2270 | return rbd_dev; | |
2271 | } | |
2272 | return NULL; | |
2273 | } | |
2274 | ||
dfc5606d | 2275 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2276 | { |
dfc5606d YS |
2277 | struct rbd_device *rbd_dev = |
2278 | container_of(dev, struct rbd_device, dev); | |
602adf40 | 2279 | |
59c2be1e YS |
2280 | if (rbd_dev->watch_request) |
2281 | ceph_osdc_unregister_linger_request(&rbd_dev->client->osdc, | |
2282 | rbd_dev->watch_request); | |
2283 | if (rbd_dev->watch_event) | |
2284 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2285 | ||
602adf40 YS |
2286 | rbd_put_client(rbd_dev); |
2287 | ||
2288 | /* clean up and free blkdev */ | |
2289 | rbd_free_disk(rbd_dev); | |
2290 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2291 | kfree(rbd_dev); | |
2292 | ||
2293 | /* release module ref */ | |
2294 | module_put(THIS_MODULE); | |
602adf40 YS |
2295 | } |
2296 | ||
dfc5606d YS |
2297 | static ssize_t rbd_remove(struct bus_type *bus, |
2298 | const char *buf, | |
2299 | size_t count) | |
602adf40 YS |
2300 | { |
2301 | struct rbd_device *rbd_dev = NULL; | |
2302 | int target_id, rc; | |
2303 | unsigned long ul; | |
2304 | int ret = count; | |
2305 | ||
2306 | rc = strict_strtoul(buf, 10, &ul); | |
2307 | if (rc) | |
2308 | return rc; | |
2309 | ||
2310 | /* convert to int; abort if we lost anything in the conversion */ | |
2311 | target_id = (int) ul; | |
2312 | if (target_id != ul) | |
2313 | return -EINVAL; | |
2314 | ||
2315 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2316 | ||
2317 | rbd_dev = __rbd_get_dev(target_id); | |
2318 | if (!rbd_dev) { | |
2319 | ret = -ENOENT; | |
2320 | goto done; | |
2321 | } | |
2322 | ||
dfc5606d YS |
2323 | list_del_init(&rbd_dev->node); |
2324 | ||
2325 | __rbd_remove_all_snaps(rbd_dev); | |
2326 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2327 | |
2328 | done: | |
2329 | mutex_unlock(&ctl_mutex); | |
2330 | return ret; | |
2331 | } | |
2332 | ||
dfc5606d YS |
2333 | static ssize_t rbd_snap_add(struct device *dev, |
2334 | struct device_attribute *attr, | |
2335 | const char *buf, | |
2336 | size_t count) | |
602adf40 | 2337 | { |
dfc5606d YS |
2338 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
2339 | int ret; | |
2340 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2341 | if (!name) |
2342 | return -ENOMEM; | |
2343 | ||
dfc5606d | 2344 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2345 | |
2346 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2347 | ||
602adf40 YS |
2348 | ret = rbd_header_add_snap(rbd_dev, |
2349 | name, GFP_KERNEL); | |
2350 | if (ret < 0) | |
59c2be1e | 2351 | goto err_unlock; |
602adf40 | 2352 | |
dfc5606d | 2353 | ret = __rbd_update_snaps(rbd_dev); |
602adf40 | 2354 | if (ret < 0) |
59c2be1e YS |
2355 | goto err_unlock; |
2356 | ||
2357 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2358 | trigger a watch callback that would need to get that mutex */ | |
2359 | mutex_unlock(&ctl_mutex); | |
2360 | ||
2361 | /* make a best effort, don't error if failed */ | |
2362 | rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name); | |
602adf40 YS |
2363 | |
2364 | ret = count; | |
59c2be1e YS |
2365 | kfree(name); |
2366 | return ret; | |
2367 | ||
2368 | err_unlock: | |
602adf40 | 2369 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2370 | kfree(name); |
2371 | return ret; | |
2372 | } | |
2373 | ||
dfc5606d YS |
2374 | static ssize_t rbd_snap_rollback(struct device *dev, |
2375 | struct device_attribute *attr, | |
2376 | const char *buf, | |
2377 | size_t count) | |
602adf40 | 2378 | { |
dfc5606d YS |
2379 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
2380 | int ret; | |
602adf40 | 2381 | u64 snapid; |
602adf40 | 2382 | u64 cur_ofs; |
dfc5606d YS |
2383 | char *seg_name = NULL; |
2384 | char *snap_name = kmalloc(count + 1, GFP_KERNEL); | |
2385 | ret = -ENOMEM; | |
2386 | if (!snap_name) | |
2387 | return ret; | |
602adf40 YS |
2388 | |
2389 | /* parse snaps add command */ | |
dfc5606d | 2390 | snprintf(snap_name, count, "%s", buf); |
602adf40 YS |
2391 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
2392 | if (!seg_name) | |
dfc5606d | 2393 | goto done; |
602adf40 YS |
2394 | |
2395 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2396 | ||
602adf40 YS |
2397 | ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL); |
2398 | if (ret < 0) | |
2399 | goto done_unlock; | |
2400 | ||
2401 | dout("snapid=%lld\n", snapid); | |
2402 | ||
2403 | cur_ofs = 0; | |
2404 | while (cur_ofs < rbd_dev->header.image_size) { | |
2405 | cur_ofs += rbd_get_segment(&rbd_dev->header, | |
2406 | rbd_dev->obj, | |
2407 | cur_ofs, (u64)-1, | |
2408 | seg_name, NULL); | |
2409 | dout("seg_name=%s\n", seg_name); | |
2410 | ||
2411 | ret = rbd_req_sync_rollback_obj(rbd_dev, snapid, seg_name); | |
2412 | if (ret < 0) | |
2413 | pr_warning("could not roll back obj %s err=%d\n", | |
2414 | seg_name, ret); | |
2415 | } | |
2416 | ||
dfc5606d | 2417 | ret = __rbd_update_snaps(rbd_dev); |
602adf40 YS |
2418 | if (ret < 0) |
2419 | goto done_unlock; | |
2420 | ||
2421 | ret = count; | |
2422 | ||
2423 | done_unlock: | |
2424 | mutex_unlock(&ctl_mutex); | |
dfc5606d | 2425 | done: |
602adf40 | 2426 | kfree(seg_name); |
dfc5606d | 2427 | kfree(snap_name); |
602adf40 YS |
2428 | |
2429 | return ret; | |
2430 | } | |
2431 | ||
dfc5606d YS |
2432 | static struct bus_attribute rbd_bus_attrs[] = { |
2433 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
2434 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
602adf40 YS |
2435 | __ATTR_NULL |
2436 | }; | |
2437 | ||
2438 | /* | |
2439 | * create control files in sysfs | |
dfc5606d | 2440 | * /sys/bus/rbd/... |
602adf40 YS |
2441 | */ |
2442 | static int rbd_sysfs_init(void) | |
2443 | { | |
dfc5606d | 2444 | int ret; |
602adf40 | 2445 | |
dfc5606d | 2446 | rbd_bus_type.bus_attrs = rbd_bus_attrs; |
602adf40 | 2447 | |
dfc5606d YS |
2448 | ret = bus_register(&rbd_bus_type); |
2449 | if (ret < 0) | |
2450 | return ret; | |
602adf40 | 2451 | |
dfc5606d | 2452 | ret = device_register(&rbd_root_dev); |
602adf40 | 2453 | |
602adf40 YS |
2454 | return ret; |
2455 | } | |
2456 | ||
2457 | static void rbd_sysfs_cleanup(void) | |
2458 | { | |
dfc5606d YS |
2459 | device_unregister(&rbd_root_dev); |
2460 | bus_unregister(&rbd_bus_type); | |
602adf40 YS |
2461 | } |
2462 | ||
2463 | int __init rbd_init(void) | |
2464 | { | |
2465 | int rc; | |
2466 | ||
2467 | rc = rbd_sysfs_init(); | |
2468 | if (rc) | |
2469 | return rc; | |
2470 | spin_lock_init(&node_lock); | |
2471 | pr_info("loaded " DRV_NAME_LONG "\n"); | |
2472 | return 0; | |
2473 | } | |
2474 | ||
2475 | void __exit rbd_exit(void) | |
2476 | { | |
2477 | rbd_sysfs_cleanup(); | |
2478 | } | |
2479 | ||
2480 | module_init(rbd_init); | |
2481 | module_exit(rbd_exit); | |
2482 | ||
2483 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2484 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2485 | MODULE_DESCRIPTION("rados block device"); | |
2486 | ||
2487 | /* following authorship retained from original osdblk.c */ | |
2488 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2489 | ||
2490 | MODULE_LICENSE("GPL"); |