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Commit | Line | Data |
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602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
34 | ||
35 | #include <linux/kernel.h> | |
36 | #include <linux/device.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/blkdev.h> | |
40 | ||
41 | #include "rbd_types.h" | |
42 | ||
43 | #define DRV_NAME "rbd" | |
44 | #define DRV_NAME_LONG "rbd (rados block device)" | |
45 | ||
46 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
47 | ||
48 | #define RBD_MAX_MD_NAME_LEN (96 + sizeof(RBD_SUFFIX)) | |
49 | #define RBD_MAX_POOL_NAME_LEN 64 | |
50 | #define RBD_MAX_SNAP_NAME_LEN 32 | |
51 | #define RBD_MAX_OPT_LEN 1024 | |
52 | ||
53 | #define RBD_SNAP_HEAD_NAME "-" | |
54 | ||
55 | #define DEV_NAME_LEN 32 | |
56 | ||
57 | /* | |
58 | * block device image metadata (in-memory version) | |
59 | */ | |
60 | struct rbd_image_header { | |
61 | u64 image_size; | |
62 | char block_name[32]; | |
63 | __u8 obj_order; | |
64 | __u8 crypt_type; | |
65 | __u8 comp_type; | |
66 | struct rw_semaphore snap_rwsem; | |
67 | struct ceph_snap_context *snapc; | |
68 | size_t snap_names_len; | |
69 | u64 snap_seq; | |
70 | u32 total_snaps; | |
71 | ||
72 | char *snap_names; | |
73 | u64 *snap_sizes; | |
74 | }; | |
75 | ||
76 | /* | |
77 | * an instance of the client. multiple devices may share a client. | |
78 | */ | |
79 | struct rbd_client { | |
80 | struct ceph_client *client; | |
81 | struct kref kref; | |
82 | struct list_head node; | |
83 | }; | |
84 | ||
85 | /* | |
86 | * a single io request | |
87 | */ | |
88 | struct rbd_request { | |
89 | struct request *rq; /* blk layer request */ | |
90 | struct bio *bio; /* cloned bio */ | |
91 | struct page **pages; /* list of used pages */ | |
92 | u64 len; | |
93 | }; | |
94 | ||
dfc5606d YS |
95 | struct rbd_snap { |
96 | struct device dev; | |
97 | const char *name; | |
98 | size_t size; | |
99 | struct list_head node; | |
100 | u64 id; | |
101 | }; | |
102 | ||
602adf40 YS |
103 | /* |
104 | * a single device | |
105 | */ | |
106 | struct rbd_device { | |
107 | int id; /* blkdev unique id */ | |
108 | ||
109 | int major; /* blkdev assigned major */ | |
110 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
111 | struct request_queue *q; | |
112 | ||
113 | struct ceph_client *client; | |
114 | struct rbd_client *rbd_client; | |
115 | ||
116 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
117 | ||
118 | spinlock_t lock; /* queue lock */ | |
119 | ||
120 | struct rbd_image_header header; | |
121 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ | |
122 | int obj_len; | |
123 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ | |
124 | char pool_name[RBD_MAX_POOL_NAME_LEN]; | |
125 | int poolid; | |
126 | ||
127 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; | |
128 | u32 cur_snap; /* index+1 of current snapshot within snap context | |
129 | 0 - for the head */ | |
130 | int read_only; | |
131 | ||
132 | struct list_head node; | |
dfc5606d YS |
133 | |
134 | /* list of snapshots */ | |
135 | struct list_head snaps; | |
136 | ||
137 | /* sysfs related */ | |
138 | struct device dev; | |
139 | }; | |
140 | ||
141 | static struct bus_type rbd_bus_type = { | |
142 | .name = "rbd", | |
602adf40 YS |
143 | }; |
144 | ||
145 | static spinlock_t node_lock; /* protects client get/put */ | |
146 | ||
602adf40 YS |
147 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
148 | static LIST_HEAD(rbd_dev_list); /* devices */ | |
149 | static LIST_HEAD(rbd_client_list); /* clients */ | |
150 | ||
dfc5606d YS |
151 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
152 | static void rbd_dev_release(struct device *dev); | |
153 | static ssize_t rbd_snap_rollback(struct device *dev, | |
154 | struct device_attribute *attr, | |
155 | const char *buf, | |
156 | size_t size); | |
157 | static ssize_t rbd_snap_add(struct device *dev, | |
158 | struct device_attribute *attr, | |
159 | const char *buf, | |
160 | size_t count); | |
161 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
162 | struct rbd_snap *snap);; | |
163 | ||
164 | ||
165 | static struct rbd_device *dev_to_rbd(struct device *dev) | |
166 | { | |
167 | return container_of(dev, struct rbd_device, dev); | |
168 | } | |
169 | ||
170 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) | |
171 | { | |
172 | return get_device(&rbd_dev->dev); | |
173 | } | |
174 | ||
175 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
176 | { | |
177 | put_device(&rbd_dev->dev); | |
178 | } | |
602adf40 YS |
179 | |
180 | static int rbd_open(struct block_device *bdev, fmode_t mode) | |
181 | { | |
182 | struct gendisk *disk = bdev->bd_disk; | |
183 | struct rbd_device *rbd_dev = disk->private_data; | |
184 | ||
dfc5606d YS |
185 | rbd_get_dev(rbd_dev); |
186 | ||
602adf40 YS |
187 | set_device_ro(bdev, rbd_dev->read_only); |
188 | ||
189 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
190 | return -EROFS; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
dfc5606d YS |
195 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
196 | { | |
197 | struct rbd_device *rbd_dev = disk->private_data; | |
198 | ||
199 | rbd_put_dev(rbd_dev); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
602adf40 YS |
204 | static const struct block_device_operations rbd_bd_ops = { |
205 | .owner = THIS_MODULE, | |
206 | .open = rbd_open, | |
dfc5606d | 207 | .release = rbd_release, |
602adf40 YS |
208 | }; |
209 | ||
210 | /* | |
211 | * Initialize an rbd client instance. | |
212 | * We own *opt. | |
213 | */ | |
214 | static struct rbd_client *rbd_client_create(struct ceph_options *opt) | |
215 | { | |
216 | struct rbd_client *rbdc; | |
217 | int ret = -ENOMEM; | |
218 | ||
219 | dout("rbd_client_create\n"); | |
220 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
221 | if (!rbdc) | |
222 | goto out_opt; | |
223 | ||
224 | kref_init(&rbdc->kref); | |
225 | INIT_LIST_HEAD(&rbdc->node); | |
226 | ||
227 | rbdc->client = ceph_create_client(opt, rbdc); | |
228 | if (IS_ERR(rbdc->client)) | |
229 | goto out_rbdc; | |
28f259b7 | 230 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
602adf40 YS |
231 | |
232 | ret = ceph_open_session(rbdc->client); | |
233 | if (ret < 0) | |
234 | goto out_err; | |
235 | ||
236 | spin_lock(&node_lock); | |
237 | list_add_tail(&rbdc->node, &rbd_client_list); | |
238 | spin_unlock(&node_lock); | |
239 | ||
240 | dout("rbd_client_create created %p\n", rbdc); | |
241 | return rbdc; | |
242 | ||
243 | out_err: | |
244 | ceph_destroy_client(rbdc->client); | |
602adf40 YS |
245 | out_rbdc: |
246 | kfree(rbdc); | |
247 | out_opt: | |
28f259b7 VK |
248 | if (opt) |
249 | ceph_destroy_options(opt); | |
250 | return ERR_PTR(ret); | |
602adf40 YS |
251 | } |
252 | ||
253 | /* | |
254 | * Find a ceph client with specific addr and configuration. | |
255 | */ | |
256 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) | |
257 | { | |
258 | struct rbd_client *client_node; | |
259 | ||
260 | if (opt->flags & CEPH_OPT_NOSHARE) | |
261 | return NULL; | |
262 | ||
263 | list_for_each_entry(client_node, &rbd_client_list, node) | |
264 | if (ceph_compare_options(opt, client_node->client) == 0) | |
265 | return client_node; | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Get a ceph client with specific addr and configuration, if one does | |
271 | * not exist create it. | |
272 | */ | |
273 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, | |
274 | char *options) | |
275 | { | |
276 | struct rbd_client *rbdc; | |
277 | struct ceph_options *opt; | |
278 | int ret; | |
279 | ||
280 | ret = ceph_parse_options(&opt, options, mon_addr, | |
281 | mon_addr + strlen(mon_addr), NULL, NULL); | |
282 | if (ret < 0) | |
283 | return ret; | |
284 | ||
285 | spin_lock(&node_lock); | |
286 | rbdc = __rbd_client_find(opt); | |
287 | if (rbdc) { | |
288 | ceph_destroy_options(opt); | |
289 | ||
290 | /* using an existing client */ | |
291 | kref_get(&rbdc->kref); | |
292 | rbd_dev->rbd_client = rbdc; | |
293 | rbd_dev->client = rbdc->client; | |
294 | spin_unlock(&node_lock); | |
295 | return 0; | |
296 | } | |
297 | spin_unlock(&node_lock); | |
298 | ||
299 | rbdc = rbd_client_create(opt); | |
300 | if (IS_ERR(rbdc)) | |
301 | return PTR_ERR(rbdc); | |
302 | ||
303 | rbd_dev->rbd_client = rbdc; | |
304 | rbd_dev->client = rbdc->client; | |
305 | return 0; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Destroy ceph client | |
310 | */ | |
311 | static void rbd_client_release(struct kref *kref) | |
312 | { | |
313 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
314 | ||
315 | dout("rbd_release_client %p\n", rbdc); | |
316 | spin_lock(&node_lock); | |
317 | list_del(&rbdc->node); | |
318 | spin_unlock(&node_lock); | |
319 | ||
320 | ceph_destroy_client(rbdc->client); | |
321 | kfree(rbdc); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
326 | * it. | |
327 | */ | |
328 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
329 | { | |
330 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
331 | rbd_dev->rbd_client = NULL; | |
332 | rbd_dev->client = NULL; | |
333 | } | |
334 | ||
335 | ||
336 | /* | |
337 | * Create a new header structure, translate header format from the on-disk | |
338 | * header. | |
339 | */ | |
340 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
341 | struct rbd_image_header_ondisk *ondisk, | |
342 | int allocated_snaps, | |
343 | gfp_t gfp_flags) | |
344 | { | |
345 | int i; | |
346 | u32 snap_count = le32_to_cpu(ondisk->snap_count); | |
347 | int ret = -ENOMEM; | |
348 | ||
349 | init_rwsem(&header->snap_rwsem); | |
602adf40 YS |
350 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
351 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + | |
352 | snap_count * | |
353 | sizeof(struct rbd_image_snap_ondisk), | |
354 | gfp_flags); | |
355 | if (!header->snapc) | |
356 | return -ENOMEM; | |
357 | if (snap_count) { | |
358 | header->snap_names = kmalloc(header->snap_names_len, | |
359 | GFP_KERNEL); | |
360 | if (!header->snap_names) | |
361 | goto err_snapc; | |
362 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
363 | GFP_KERNEL); | |
364 | if (!header->snap_sizes) | |
365 | goto err_names; | |
366 | } else { | |
367 | header->snap_names = NULL; | |
368 | header->snap_sizes = NULL; | |
369 | } | |
370 | memcpy(header->block_name, ondisk->block_name, | |
371 | sizeof(ondisk->block_name)); | |
372 | ||
373 | header->image_size = le64_to_cpu(ondisk->image_size); | |
374 | header->obj_order = ondisk->options.order; | |
375 | header->crypt_type = ondisk->options.crypt_type; | |
376 | header->comp_type = ondisk->options.comp_type; | |
377 | ||
378 | atomic_set(&header->snapc->nref, 1); | |
379 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
380 | header->snapc->num_snaps = snap_count; | |
381 | header->total_snaps = snap_count; | |
382 | ||
383 | if (snap_count && | |
384 | allocated_snaps == snap_count) { | |
385 | for (i = 0; i < snap_count; i++) { | |
386 | header->snapc->snaps[i] = | |
387 | le64_to_cpu(ondisk->snaps[i].id); | |
388 | header->snap_sizes[i] = | |
389 | le64_to_cpu(ondisk->snaps[i].image_size); | |
390 | } | |
391 | ||
392 | /* copy snapshot names */ | |
393 | memcpy(header->snap_names, &ondisk->snaps[i], | |
394 | header->snap_names_len); | |
395 | } | |
396 | ||
397 | return 0; | |
398 | ||
399 | err_names: | |
400 | kfree(header->snap_names); | |
401 | err_snapc: | |
402 | kfree(header->snapc); | |
403 | return ret; | |
404 | } | |
405 | ||
406 | static int snap_index(struct rbd_image_header *header, int snap_num) | |
407 | { | |
408 | return header->total_snaps - snap_num; | |
409 | } | |
410 | ||
411 | static u64 cur_snap_id(struct rbd_device *rbd_dev) | |
412 | { | |
413 | struct rbd_image_header *header = &rbd_dev->header; | |
414 | ||
415 | if (!rbd_dev->cur_snap) | |
416 | return 0; | |
417 | ||
418 | return header->snapc->snaps[snap_index(header, rbd_dev->cur_snap)]; | |
419 | } | |
420 | ||
421 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, | |
422 | u64 *seq, u64 *size) | |
423 | { | |
424 | int i; | |
425 | char *p = header->snap_names; | |
426 | ||
427 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { | |
428 | if (strcmp(snap_name, p) == 0) | |
429 | break; | |
430 | } | |
431 | if (i == header->total_snaps) | |
432 | return -ENOENT; | |
433 | if (seq) | |
434 | *seq = header->snapc->snaps[i]; | |
435 | ||
436 | if (size) | |
437 | *size = header->snap_sizes[i]; | |
438 | ||
439 | return i; | |
440 | } | |
441 | ||
442 | static int rbd_header_set_snap(struct rbd_device *dev, | |
443 | const char *snap_name, | |
444 | u64 *size) | |
445 | { | |
446 | struct rbd_image_header *header = &dev->header; | |
447 | struct ceph_snap_context *snapc = header->snapc; | |
448 | int ret = -ENOENT; | |
449 | ||
450 | down_write(&header->snap_rwsem); | |
451 | ||
452 | if (!snap_name || | |
453 | !*snap_name || | |
454 | strcmp(snap_name, "-") == 0 || | |
455 | strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) { | |
456 | if (header->total_snaps) | |
457 | snapc->seq = header->snap_seq; | |
458 | else | |
459 | snapc->seq = 0; | |
460 | dev->cur_snap = 0; | |
461 | dev->read_only = 0; | |
462 | if (size) | |
463 | *size = header->image_size; | |
464 | } else { | |
465 | ret = snap_by_name(header, snap_name, &snapc->seq, size); | |
466 | if (ret < 0) | |
467 | goto done; | |
468 | ||
469 | dev->cur_snap = header->total_snaps - ret; | |
470 | dev->read_only = 1; | |
471 | } | |
472 | ||
473 | ret = 0; | |
474 | done: | |
475 | up_write(&header->snap_rwsem); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | static void rbd_header_free(struct rbd_image_header *header) | |
480 | { | |
481 | kfree(header->snapc); | |
482 | kfree(header->snap_names); | |
483 | kfree(header->snap_sizes); | |
484 | } | |
485 | ||
486 | /* | |
487 | * get the actual striped segment name, offset and length | |
488 | */ | |
489 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
490 | const char *block_name, | |
491 | u64 ofs, u64 len, | |
492 | char *seg_name, u64 *segofs) | |
493 | { | |
494 | u64 seg = ofs >> header->obj_order; | |
495 | ||
496 | if (seg_name) | |
497 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
498 | "%s.%012llx", block_name, seg); | |
499 | ||
500 | ofs = ofs & ((1 << header->obj_order) - 1); | |
501 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
502 | ||
503 | if (segofs) | |
504 | *segofs = ofs; | |
505 | ||
506 | return len; | |
507 | } | |
508 | ||
509 | /* | |
510 | * bio helpers | |
511 | */ | |
512 | ||
513 | static void bio_chain_put(struct bio *chain) | |
514 | { | |
515 | struct bio *tmp; | |
516 | ||
517 | while (chain) { | |
518 | tmp = chain; | |
519 | chain = chain->bi_next; | |
520 | bio_put(tmp); | |
521 | } | |
522 | } | |
523 | ||
524 | /* | |
525 | * zeros a bio chain, starting at specific offset | |
526 | */ | |
527 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
528 | { | |
529 | struct bio_vec *bv; | |
530 | unsigned long flags; | |
531 | void *buf; | |
532 | int i; | |
533 | int pos = 0; | |
534 | ||
535 | while (chain) { | |
536 | bio_for_each_segment(bv, chain, i) { | |
537 | if (pos + bv->bv_len > start_ofs) { | |
538 | int remainder = max(start_ofs - pos, 0); | |
539 | buf = bvec_kmap_irq(bv, &flags); | |
540 | memset(buf + remainder, 0, | |
541 | bv->bv_len - remainder); | |
85b5aaa6 | 542 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
543 | } |
544 | pos += bv->bv_len; | |
545 | } | |
546 | ||
547 | chain = chain->bi_next; | |
548 | } | |
549 | } | |
550 | ||
551 | /* | |
552 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
553 | * might return a bio_pair that will need to be released. | |
554 | */ | |
555 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
556 | struct bio_pair **bp, | |
557 | int len, gfp_t gfpmask) | |
558 | { | |
559 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
560 | int total = 0; | |
561 | ||
562 | if (*bp) { | |
563 | bio_pair_release(*bp); | |
564 | *bp = NULL; | |
565 | } | |
566 | ||
567 | while (old_chain && (total < len)) { | |
568 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
569 | if (!tmp) | |
570 | goto err_out; | |
571 | ||
572 | if (total + old_chain->bi_size > len) { | |
573 | struct bio_pair *bp; | |
574 | ||
575 | /* | |
576 | * this split can only happen with a single paged bio, | |
577 | * split_bio will BUG_ON if this is not the case | |
578 | */ | |
579 | dout("bio_chain_clone split! total=%d remaining=%d" | |
580 | "bi_size=%d\n", | |
581 | (int)total, (int)len-total, | |
582 | (int)old_chain->bi_size); | |
583 | ||
584 | /* split the bio. We'll release it either in the next | |
585 | call, or it will have to be released outside */ | |
586 | bp = bio_split(old_chain, (len - total) / 512ULL); | |
587 | if (!bp) | |
588 | goto err_out; | |
589 | ||
590 | __bio_clone(tmp, &bp->bio1); | |
591 | ||
592 | *next = &bp->bio2; | |
593 | } else { | |
594 | __bio_clone(tmp, old_chain); | |
595 | *next = old_chain->bi_next; | |
596 | } | |
597 | ||
598 | tmp->bi_bdev = NULL; | |
599 | gfpmask &= ~__GFP_WAIT; | |
600 | tmp->bi_next = NULL; | |
601 | ||
602 | if (!new_chain) { | |
603 | new_chain = tail = tmp; | |
604 | } else { | |
605 | tail->bi_next = tmp; | |
606 | tail = tmp; | |
607 | } | |
608 | old_chain = old_chain->bi_next; | |
609 | ||
610 | total += tmp->bi_size; | |
611 | } | |
612 | ||
613 | BUG_ON(total < len); | |
614 | ||
615 | if (tail) | |
616 | tail->bi_next = NULL; | |
617 | ||
618 | *old = old_chain; | |
619 | ||
620 | return new_chain; | |
621 | ||
622 | err_out: | |
623 | dout("bio_chain_clone with err\n"); | |
624 | bio_chain_put(new_chain); | |
625 | return NULL; | |
626 | } | |
627 | ||
628 | /* | |
629 | * helpers for osd request op vectors. | |
630 | */ | |
631 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
632 | int num_ops, | |
633 | int opcode, | |
634 | u32 payload_len) | |
635 | { | |
636 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
637 | GFP_NOIO); | |
638 | if (!*ops) | |
639 | return -ENOMEM; | |
640 | (*ops)[0].op = opcode; | |
641 | /* | |
642 | * op extent offset and length will be set later on | |
643 | * in calc_raw_layout() | |
644 | */ | |
645 | (*ops)[0].payload_len = payload_len; | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
650 | { | |
651 | kfree(ops); | |
652 | } | |
653 | ||
654 | /* | |
655 | * Send ceph osd request | |
656 | */ | |
657 | static int rbd_do_request(struct request *rq, | |
658 | struct rbd_device *dev, | |
659 | struct ceph_snap_context *snapc, | |
660 | u64 snapid, | |
661 | const char *obj, u64 ofs, u64 len, | |
662 | struct bio *bio, | |
663 | struct page **pages, | |
664 | int num_pages, | |
665 | int flags, | |
666 | struct ceph_osd_req_op *ops, | |
667 | int num_reply, | |
668 | void (*rbd_cb)(struct ceph_osd_request *req, | |
669 | struct ceph_msg *msg)) | |
670 | { | |
671 | struct ceph_osd_request *req; | |
672 | struct ceph_file_layout *layout; | |
673 | int ret; | |
674 | u64 bno; | |
675 | struct timespec mtime = CURRENT_TIME; | |
676 | struct rbd_request *req_data; | |
677 | struct ceph_osd_request_head *reqhead; | |
678 | struct rbd_image_header *header = &dev->header; | |
679 | ||
680 | ret = -ENOMEM; | |
681 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); | |
682 | if (!req_data) | |
683 | goto done; | |
684 | ||
685 | dout("rbd_do_request len=%lld ofs=%lld\n", len, ofs); | |
686 | ||
687 | down_read(&header->snap_rwsem); | |
688 | ||
689 | req = ceph_osdc_alloc_request(&dev->client->osdc, flags, | |
690 | snapc, | |
691 | ops, | |
692 | false, | |
693 | GFP_NOIO, pages, bio); | |
694 | if (IS_ERR(req)) { | |
695 | up_read(&header->snap_rwsem); | |
696 | ret = PTR_ERR(req); | |
697 | goto done_pages; | |
698 | } | |
699 | ||
700 | req->r_callback = rbd_cb; | |
701 | ||
702 | req_data->rq = rq; | |
703 | req_data->bio = bio; | |
704 | req_data->pages = pages; | |
705 | req_data->len = len; | |
706 | ||
707 | req->r_priv = req_data; | |
708 | ||
709 | reqhead = req->r_request->front.iov_base; | |
710 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
711 | ||
712 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); | |
713 | req->r_oid_len = strlen(req->r_oid); | |
714 | ||
715 | layout = &req->r_file_layout; | |
716 | memset(layout, 0, sizeof(*layout)); | |
717 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
718 | layout->fl_stripe_count = cpu_to_le32(1); | |
719 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
720 | layout->fl_pg_preferred = cpu_to_le32(-1); | |
721 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); | |
722 | ceph_calc_raw_layout(&dev->client->osdc, layout, snapid, | |
723 | ofs, &len, &bno, req, ops); | |
724 | ||
725 | ceph_osdc_build_request(req, ofs, &len, | |
726 | ops, | |
727 | snapc, | |
728 | &mtime, | |
729 | req->r_oid, req->r_oid_len); | |
730 | up_read(&header->snap_rwsem); | |
731 | ||
732 | ret = ceph_osdc_start_request(&dev->client->osdc, req, false); | |
733 | if (ret < 0) | |
734 | goto done_err; | |
735 | ||
736 | if (!rbd_cb) { | |
737 | ret = ceph_osdc_wait_request(&dev->client->osdc, req); | |
738 | ceph_osdc_put_request(req); | |
739 | } | |
740 | return ret; | |
741 | ||
742 | done_err: | |
743 | bio_chain_put(req_data->bio); | |
744 | ceph_osdc_put_request(req); | |
745 | done_pages: | |
746 | kfree(req_data); | |
747 | done: | |
748 | if (rq) | |
749 | blk_end_request(rq, ret, len); | |
750 | return ret; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Ceph osd op callback | |
755 | */ | |
756 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
757 | { | |
758 | struct rbd_request *req_data = req->r_priv; | |
759 | struct ceph_osd_reply_head *replyhead; | |
760 | struct ceph_osd_op *op; | |
761 | __s32 rc; | |
762 | u64 bytes; | |
763 | int read_op; | |
764 | ||
765 | /* parse reply */ | |
766 | replyhead = msg->front.iov_base; | |
767 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
768 | op = (void *)(replyhead + 1); | |
769 | rc = le32_to_cpu(replyhead->result); | |
770 | bytes = le64_to_cpu(op->extent.length); | |
771 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); | |
772 | ||
773 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
774 | ||
775 | if (rc == -ENOENT && read_op) { | |
776 | zero_bio_chain(req_data->bio, 0); | |
777 | rc = 0; | |
778 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
779 | zero_bio_chain(req_data->bio, bytes); | |
780 | bytes = req_data->len; | |
781 | } | |
782 | ||
783 | blk_end_request(req_data->rq, rc, bytes); | |
784 | ||
785 | if (req_data->bio) | |
786 | bio_chain_put(req_data->bio); | |
787 | ||
788 | ceph_osdc_put_request(req); | |
789 | kfree(req_data); | |
790 | } | |
791 | ||
792 | /* | |
793 | * Do a synchronous ceph osd operation | |
794 | */ | |
795 | static int rbd_req_sync_op(struct rbd_device *dev, | |
796 | struct ceph_snap_context *snapc, | |
797 | u64 snapid, | |
798 | int opcode, | |
799 | int flags, | |
800 | struct ceph_osd_req_op *orig_ops, | |
801 | int num_reply, | |
802 | const char *obj, | |
803 | u64 ofs, u64 len, | |
804 | char *buf) | |
805 | { | |
806 | int ret; | |
807 | struct page **pages; | |
808 | int num_pages; | |
809 | struct ceph_osd_req_op *ops = orig_ops; | |
810 | u32 payload_len; | |
811 | ||
812 | num_pages = calc_pages_for(ofs , len); | |
813 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
814 | if (IS_ERR(pages)) |
815 | return PTR_ERR(pages); | |
602adf40 YS |
816 | |
817 | if (!orig_ops) { | |
818 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
819 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
820 | if (ret < 0) | |
821 | goto done; | |
822 | ||
823 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
824 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
825 | if (ret < 0) | |
826 | goto done_ops; | |
827 | } | |
828 | } | |
829 | ||
830 | ret = rbd_do_request(NULL, dev, snapc, snapid, | |
831 | obj, ofs, len, NULL, | |
832 | pages, num_pages, | |
833 | flags, | |
834 | ops, | |
835 | 2, | |
836 | NULL); | |
837 | if (ret < 0) | |
838 | goto done_ops; | |
839 | ||
840 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
841 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
842 | ||
843 | done_ops: | |
844 | if (!orig_ops) | |
845 | rbd_destroy_ops(ops); | |
846 | done: | |
847 | ceph_release_page_vector(pages, num_pages); | |
848 | return ret; | |
849 | } | |
850 | ||
851 | /* | |
852 | * Do an asynchronous ceph osd operation | |
853 | */ | |
854 | static int rbd_do_op(struct request *rq, | |
855 | struct rbd_device *rbd_dev , | |
856 | struct ceph_snap_context *snapc, | |
857 | u64 snapid, | |
858 | int opcode, int flags, int num_reply, | |
859 | u64 ofs, u64 len, | |
860 | struct bio *bio) | |
861 | { | |
862 | char *seg_name; | |
863 | u64 seg_ofs; | |
864 | u64 seg_len; | |
865 | int ret; | |
866 | struct ceph_osd_req_op *ops; | |
867 | u32 payload_len; | |
868 | ||
869 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
870 | if (!seg_name) | |
871 | return -ENOMEM; | |
872 | ||
873 | seg_len = rbd_get_segment(&rbd_dev->header, | |
874 | rbd_dev->header.block_name, | |
875 | ofs, len, | |
876 | seg_name, &seg_ofs); | |
602adf40 YS |
877 | |
878 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
879 | ||
880 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
881 | if (ret < 0) | |
882 | goto done; | |
883 | ||
884 | /* we've taken care of segment sizes earlier when we | |
885 | cloned the bios. We should never have a segment | |
886 | truncated at this point */ | |
887 | BUG_ON(seg_len < len); | |
888 | ||
889 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
890 | seg_name, seg_ofs, seg_len, | |
891 | bio, | |
892 | NULL, 0, | |
893 | flags, | |
894 | ops, | |
895 | num_reply, | |
896 | rbd_req_cb); | |
897 | done: | |
898 | kfree(seg_name); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Request async osd write | |
904 | */ | |
905 | static int rbd_req_write(struct request *rq, | |
906 | struct rbd_device *rbd_dev, | |
907 | struct ceph_snap_context *snapc, | |
908 | u64 ofs, u64 len, | |
909 | struct bio *bio) | |
910 | { | |
911 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
912 | CEPH_OSD_OP_WRITE, | |
913 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
914 | 2, | |
915 | ofs, len, bio); | |
916 | } | |
917 | ||
918 | /* | |
919 | * Request async osd read | |
920 | */ | |
921 | static int rbd_req_read(struct request *rq, | |
922 | struct rbd_device *rbd_dev, | |
923 | u64 snapid, | |
924 | u64 ofs, u64 len, | |
925 | struct bio *bio) | |
926 | { | |
927 | return rbd_do_op(rq, rbd_dev, NULL, | |
928 | (snapid ? snapid : CEPH_NOSNAP), | |
929 | CEPH_OSD_OP_READ, | |
930 | CEPH_OSD_FLAG_READ, | |
931 | 2, | |
932 | ofs, len, bio); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Request sync osd read | |
937 | */ | |
938 | static int rbd_req_sync_read(struct rbd_device *dev, | |
939 | struct ceph_snap_context *snapc, | |
940 | u64 snapid, | |
941 | const char *obj, | |
942 | u64 ofs, u64 len, | |
943 | char *buf) | |
944 | { | |
945 | return rbd_req_sync_op(dev, NULL, | |
946 | (snapid ? snapid : CEPH_NOSNAP), | |
947 | CEPH_OSD_OP_READ, | |
948 | CEPH_OSD_FLAG_READ, | |
949 | NULL, | |
950 | 1, obj, ofs, len, buf); | |
951 | } | |
952 | ||
953 | /* | |
954 | * Request sync osd read | |
955 | */ | |
956 | static int rbd_req_sync_rollback_obj(struct rbd_device *dev, | |
957 | u64 snapid, | |
958 | const char *obj) | |
959 | { | |
960 | struct ceph_osd_req_op *ops; | |
961 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_ROLLBACK, 0); | |
962 | if (ret < 0) | |
963 | return ret; | |
964 | ||
965 | ops[0].snap.snapid = snapid; | |
966 | ||
967 | ret = rbd_req_sync_op(dev, NULL, | |
968 | CEPH_NOSNAP, | |
969 | 0, | |
970 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
971 | ops, | |
972 | 1, obj, 0, 0, NULL); | |
973 | ||
974 | rbd_destroy_ops(ops); | |
975 | ||
976 | if (ret < 0) | |
977 | return ret; | |
978 | ||
979 | return ret; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Request sync osd read | |
984 | */ | |
985 | static int rbd_req_sync_exec(struct rbd_device *dev, | |
986 | const char *obj, | |
987 | const char *cls, | |
988 | const char *method, | |
989 | const char *data, | |
990 | int len) | |
991 | { | |
992 | struct ceph_osd_req_op *ops; | |
993 | int cls_len = strlen(cls); | |
994 | int method_len = strlen(method); | |
995 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
996 | cls_len + method_len + len); | |
997 | if (ret < 0) | |
998 | return ret; | |
999 | ||
1000 | ops[0].cls.class_name = cls; | |
1001 | ops[0].cls.class_len = (__u8)cls_len; | |
1002 | ops[0].cls.method_name = method; | |
1003 | ops[0].cls.method_len = (__u8)method_len; | |
1004 | ops[0].cls.argc = 0; | |
1005 | ops[0].cls.indata = data; | |
1006 | ops[0].cls.indata_len = len; | |
1007 | ||
1008 | ret = rbd_req_sync_op(dev, NULL, | |
1009 | CEPH_NOSNAP, | |
1010 | 0, | |
1011 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1012 | ops, | |
1013 | 1, obj, 0, 0, NULL); | |
1014 | ||
1015 | rbd_destroy_ops(ops); | |
1016 | ||
1017 | dout("cls_exec returned %d\n", ret); | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * block device queue callback | |
1023 | */ | |
1024 | static void rbd_rq_fn(struct request_queue *q) | |
1025 | { | |
1026 | struct rbd_device *rbd_dev = q->queuedata; | |
1027 | struct request *rq; | |
1028 | struct bio_pair *bp = NULL; | |
1029 | ||
1030 | rq = blk_fetch_request(q); | |
1031 | ||
1032 | while (1) { | |
1033 | struct bio *bio; | |
1034 | struct bio *rq_bio, *next_bio = NULL; | |
1035 | bool do_write; | |
1036 | int size, op_size = 0; | |
1037 | u64 ofs; | |
1038 | ||
1039 | /* peek at request from block layer */ | |
1040 | if (!rq) | |
1041 | break; | |
1042 | ||
1043 | dout("fetched request\n"); | |
1044 | ||
1045 | /* filter out block requests we don't understand */ | |
1046 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1047 | __blk_end_request_all(rq, 0); | |
1048 | goto next; | |
1049 | } | |
1050 | ||
1051 | /* deduce our operation (read, write) */ | |
1052 | do_write = (rq_data_dir(rq) == WRITE); | |
1053 | ||
1054 | size = blk_rq_bytes(rq); | |
1055 | ofs = blk_rq_pos(rq) * 512ULL; | |
1056 | rq_bio = rq->bio; | |
1057 | if (do_write && rbd_dev->read_only) { | |
1058 | __blk_end_request_all(rq, -EROFS); | |
1059 | goto next; | |
1060 | } | |
1061 | ||
1062 | spin_unlock_irq(q->queue_lock); | |
1063 | ||
1064 | dout("%s 0x%x bytes at 0x%llx\n", | |
1065 | do_write ? "write" : "read", | |
1066 | size, blk_rq_pos(rq) * 512ULL); | |
1067 | ||
1068 | do { | |
1069 | /* a bio clone to be passed down to OSD req */ | |
1070 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1071 | op_size = rbd_get_segment(&rbd_dev->header, | |
1072 | rbd_dev->header.block_name, | |
1073 | ofs, size, | |
1074 | NULL, NULL); | |
1075 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, | |
1076 | op_size, GFP_ATOMIC); | |
1077 | if (!bio) { | |
1078 | spin_lock_irq(q->queue_lock); | |
1079 | __blk_end_request_all(rq, -ENOMEM); | |
1080 | goto next; | |
1081 | } | |
1082 | ||
1083 | /* init OSD command: write or read */ | |
1084 | if (do_write) | |
1085 | rbd_req_write(rq, rbd_dev, | |
1086 | rbd_dev->header.snapc, | |
1087 | ofs, | |
1088 | op_size, bio); | |
1089 | else | |
1090 | rbd_req_read(rq, rbd_dev, | |
1091 | cur_snap_id(rbd_dev), | |
1092 | ofs, | |
1093 | op_size, bio); | |
1094 | ||
1095 | size -= op_size; | |
1096 | ofs += op_size; | |
1097 | ||
1098 | rq_bio = next_bio; | |
1099 | } while (size > 0); | |
1100 | ||
1101 | if (bp) | |
1102 | bio_pair_release(bp); | |
1103 | ||
1104 | spin_lock_irq(q->queue_lock); | |
1105 | next: | |
1106 | rq = blk_fetch_request(q); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1112 | * multiple osd objects. One exception would be with a single page bios, | |
1113 | * which we handle later at bio_chain_clone | |
1114 | */ | |
1115 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1116 | struct bio_vec *bvec) | |
1117 | { | |
1118 | struct rbd_device *rbd_dev = q->queuedata; | |
1119 | unsigned int chunk_sectors = 1 << (rbd_dev->header.obj_order - 9); | |
1120 | sector_t sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1121 | unsigned int bio_sectors = bmd->bi_size >> 9; | |
1122 | int max; | |
1123 | ||
1124 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) | |
1125 | + bio_sectors)) << 9; | |
1126 | if (max < 0) | |
1127 | max = 0; /* bio_add cannot handle a negative return */ | |
1128 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1129 | return bvec->bv_len; | |
1130 | return max; | |
1131 | } | |
1132 | ||
1133 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1134 | { | |
1135 | struct gendisk *disk = rbd_dev->disk; | |
1136 | ||
1137 | if (!disk) | |
1138 | return; | |
1139 | ||
1140 | rbd_header_free(&rbd_dev->header); | |
1141 | ||
1142 | if (disk->flags & GENHD_FL_UP) | |
1143 | del_gendisk(disk); | |
1144 | if (disk->queue) | |
1145 | blk_cleanup_queue(disk->queue); | |
1146 | put_disk(disk); | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * reload the ondisk the header | |
1151 | */ | |
1152 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1153 | struct rbd_image_header *header) | |
1154 | { | |
1155 | ssize_t rc; | |
1156 | struct rbd_image_header_ondisk *dh; | |
1157 | int snap_count = 0; | |
1158 | u64 snap_names_len = 0; | |
1159 | ||
1160 | while (1) { | |
1161 | int len = sizeof(*dh) + | |
1162 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1163 | snap_names_len; | |
1164 | ||
1165 | rc = -ENOMEM; | |
1166 | dh = kmalloc(len, GFP_KERNEL); | |
1167 | if (!dh) | |
1168 | return -ENOMEM; | |
1169 | ||
1170 | rc = rbd_req_sync_read(rbd_dev, | |
1171 | NULL, CEPH_NOSNAP, | |
1172 | rbd_dev->obj_md_name, | |
1173 | 0, len, | |
1174 | (char *)dh); | |
1175 | if (rc < 0) | |
1176 | goto out_dh; | |
1177 | ||
1178 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
1179 | if (rc < 0) | |
1180 | goto out_dh; | |
1181 | ||
1182 | if (snap_count != header->total_snaps) { | |
1183 | snap_count = header->total_snaps; | |
1184 | snap_names_len = header->snap_names_len; | |
1185 | rbd_header_free(header); | |
1186 | kfree(dh); | |
1187 | continue; | |
1188 | } | |
1189 | break; | |
1190 | } | |
1191 | ||
1192 | out_dh: | |
1193 | kfree(dh); | |
1194 | return rc; | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * create a snapshot | |
1199 | */ | |
1200 | static int rbd_header_add_snap(struct rbd_device *dev, | |
1201 | const char *snap_name, | |
1202 | gfp_t gfp_flags) | |
1203 | { | |
1204 | int name_len = strlen(snap_name); | |
1205 | u64 new_snapid; | |
1206 | int ret; | |
1207 | void *data, *data_start, *data_end; | |
1208 | ||
1209 | /* we should create a snapshot only if we're pointing at the head */ | |
1210 | if (dev->cur_snap) | |
1211 | return -EINVAL; | |
1212 | ||
1213 | ret = ceph_monc_create_snapid(&dev->client->monc, dev->poolid, | |
1214 | &new_snapid); | |
1215 | dout("created snapid=%lld\n", new_snapid); | |
1216 | if (ret < 0) | |
1217 | return ret; | |
1218 | ||
1219 | data = kmalloc(name_len + 16, gfp_flags); | |
1220 | if (!data) | |
1221 | return -ENOMEM; | |
1222 | ||
1223 | data_start = data; | |
1224 | data_end = data + name_len + 16; | |
1225 | ||
1226 | ceph_encode_string_safe(&data, data_end, snap_name, name_len, bad); | |
1227 | ceph_encode_64_safe(&data, data_end, new_snapid, bad); | |
1228 | ||
1229 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", | |
1230 | data_start, data - data_start); | |
1231 | ||
1232 | kfree(data_start); | |
1233 | ||
1234 | if (ret < 0) | |
1235 | return ret; | |
1236 | ||
1237 | dev->header.snapc->seq = new_snapid; | |
1238 | ||
1239 | return 0; | |
1240 | bad: | |
1241 | return -ERANGE; | |
1242 | } | |
1243 | ||
dfc5606d YS |
1244 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1245 | { | |
1246 | struct rbd_snap *snap; | |
1247 | ||
1248 | while (!list_empty(&rbd_dev->snaps)) { | |
1249 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); | |
1250 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1251 | } | |
1252 | } | |
1253 | ||
602adf40 YS |
1254 | /* |
1255 | * only read the first part of the ondisk header, without the snaps info | |
1256 | */ | |
dfc5606d | 1257 | static int __rbd_update_snaps(struct rbd_device *rbd_dev) |
602adf40 YS |
1258 | { |
1259 | int ret; | |
1260 | struct rbd_image_header h; | |
1261 | u64 snap_seq; | |
1262 | ||
1263 | ret = rbd_read_header(rbd_dev, &h); | |
1264 | if (ret < 0) | |
1265 | return ret; | |
1266 | ||
1267 | down_write(&rbd_dev->header.snap_rwsem); | |
1268 | ||
1269 | snap_seq = rbd_dev->header.snapc->seq; | |
1270 | ||
1271 | kfree(rbd_dev->header.snapc); | |
1272 | kfree(rbd_dev->header.snap_names); | |
1273 | kfree(rbd_dev->header.snap_sizes); | |
1274 | ||
1275 | rbd_dev->header.total_snaps = h.total_snaps; | |
1276 | rbd_dev->header.snapc = h.snapc; | |
1277 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1278 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 YS |
1279 | rbd_dev->header.snap_sizes = h.snap_sizes; |
1280 | rbd_dev->header.snapc->seq = snap_seq; | |
1281 | ||
dfc5606d YS |
1282 | ret = __rbd_init_snaps_header(rbd_dev); |
1283 | ||
602adf40 YS |
1284 | up_write(&rbd_dev->header.snap_rwsem); |
1285 | ||
dfc5606d | 1286 | return ret; |
602adf40 YS |
1287 | } |
1288 | ||
1289 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1290 | { | |
1291 | struct gendisk *disk; | |
1292 | struct request_queue *q; | |
1293 | int rc; | |
1294 | u64 total_size = 0; | |
1295 | ||
1296 | /* contact OSD, request size info about the object being mapped */ | |
1297 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1298 | if (rc) | |
1299 | return rc; | |
1300 | ||
dfc5606d YS |
1301 | /* no need to lock here, as rbd_dev is not registered yet */ |
1302 | rc = __rbd_init_snaps_header(rbd_dev); | |
1303 | if (rc) | |
1304 | return rc; | |
1305 | ||
602adf40 YS |
1306 | rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); |
1307 | if (rc) | |
1308 | return rc; | |
1309 | ||
1310 | /* create gendisk info */ | |
1311 | rc = -ENOMEM; | |
1312 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1313 | if (!disk) | |
1314 | goto out; | |
1315 | ||
1316 | sprintf(disk->disk_name, DRV_NAME "%d", rbd_dev->id); | |
1317 | disk->major = rbd_dev->major; | |
1318 | disk->first_minor = 0; | |
1319 | disk->fops = &rbd_bd_ops; | |
1320 | disk->private_data = rbd_dev; | |
1321 | ||
1322 | /* init rq */ | |
1323 | rc = -ENOMEM; | |
1324 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1325 | if (!q) | |
1326 | goto out_disk; | |
1327 | blk_queue_merge_bvec(q, rbd_merge_bvec); | |
1328 | disk->queue = q; | |
1329 | ||
1330 | q->queuedata = rbd_dev; | |
1331 | ||
1332 | rbd_dev->disk = disk; | |
1333 | rbd_dev->q = q; | |
1334 | ||
1335 | /* finally, announce the disk to the world */ | |
1336 | set_capacity(disk, total_size / 512ULL); | |
1337 | add_disk(disk); | |
1338 | ||
1339 | pr_info("%s: added with size 0x%llx\n", | |
1340 | disk->disk_name, (unsigned long long)total_size); | |
1341 | return 0; | |
1342 | ||
1343 | out_disk: | |
1344 | put_disk(disk); | |
1345 | out: | |
1346 | return rc; | |
1347 | } | |
1348 | ||
dfc5606d YS |
1349 | /* |
1350 | sysfs | |
1351 | */ | |
1352 | ||
1353 | static ssize_t rbd_size_show(struct device *dev, | |
1354 | struct device_attribute *attr, char *buf) | |
1355 | { | |
1356 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1357 | ||
1358 | return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); | |
1359 | } | |
1360 | ||
1361 | static ssize_t rbd_major_show(struct device *dev, | |
1362 | struct device_attribute *attr, char *buf) | |
1363 | { | |
1364 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
602adf40 | 1365 | |
dfc5606d YS |
1366 | return sprintf(buf, "%d\n", rbd_dev->major); |
1367 | } | |
1368 | ||
1369 | static ssize_t rbd_client_id_show(struct device *dev, | |
1370 | struct device_attribute *attr, char *buf) | |
602adf40 | 1371 | { |
dfc5606d YS |
1372 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1373 | ||
1374 | return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client)); | |
602adf40 YS |
1375 | } |
1376 | ||
dfc5606d YS |
1377 | static ssize_t rbd_pool_show(struct device *dev, |
1378 | struct device_attribute *attr, char *buf) | |
602adf40 | 1379 | { |
dfc5606d YS |
1380 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1381 | ||
1382 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1383 | } | |
1384 | ||
1385 | static ssize_t rbd_name_show(struct device *dev, | |
1386 | struct device_attribute *attr, char *buf) | |
1387 | { | |
1388 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1389 | ||
1390 | return sprintf(buf, "%s\n", rbd_dev->obj); | |
1391 | } | |
1392 | ||
1393 | static ssize_t rbd_snap_show(struct device *dev, | |
1394 | struct device_attribute *attr, | |
1395 | char *buf) | |
1396 | { | |
1397 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1398 | ||
1399 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1400 | } | |
1401 | ||
1402 | static ssize_t rbd_image_refresh(struct device *dev, | |
1403 | struct device_attribute *attr, | |
1404 | const char *buf, | |
1405 | size_t size) | |
1406 | { | |
1407 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1408 | int rc; | |
1409 | int ret = size; | |
602adf40 YS |
1410 | |
1411 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1412 | ||
dfc5606d YS |
1413 | rc = __rbd_update_snaps(rbd_dev); |
1414 | if (rc < 0) | |
1415 | ret = rc; | |
602adf40 | 1416 | |
dfc5606d YS |
1417 | mutex_unlock(&ctl_mutex); |
1418 | return ret; | |
1419 | } | |
602adf40 | 1420 | |
dfc5606d YS |
1421 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1422 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1423 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1424 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
1425 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); | |
1426 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1427 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1428 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
1429 | static DEVICE_ATTR(rollback_snap, S_IWUSR, NULL, rbd_snap_rollback); | |
1430 | ||
1431 | static struct attribute *rbd_attrs[] = { | |
1432 | &dev_attr_size.attr, | |
1433 | &dev_attr_major.attr, | |
1434 | &dev_attr_client_id.attr, | |
1435 | &dev_attr_pool.attr, | |
1436 | &dev_attr_name.attr, | |
1437 | &dev_attr_current_snap.attr, | |
1438 | &dev_attr_refresh.attr, | |
1439 | &dev_attr_create_snap.attr, | |
1440 | &dev_attr_rollback_snap.attr, | |
1441 | NULL | |
1442 | }; | |
1443 | ||
1444 | static struct attribute_group rbd_attr_group = { | |
1445 | .attrs = rbd_attrs, | |
1446 | }; | |
1447 | ||
1448 | static const struct attribute_group *rbd_attr_groups[] = { | |
1449 | &rbd_attr_group, | |
1450 | NULL | |
1451 | }; | |
1452 | ||
1453 | static void rbd_sysfs_dev_release(struct device *dev) | |
1454 | { | |
1455 | } | |
1456 | ||
1457 | static struct device_type rbd_device_type = { | |
1458 | .name = "rbd", | |
1459 | .groups = rbd_attr_groups, | |
1460 | .release = rbd_sysfs_dev_release, | |
1461 | }; | |
1462 | ||
1463 | ||
1464 | /* | |
1465 | sysfs - snapshots | |
1466 | */ | |
1467 | ||
1468 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1469 | struct device_attribute *attr, | |
1470 | char *buf) | |
1471 | { | |
1472 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1473 | ||
1474 | return sprintf(buf, "%lld\n", (long long)snap->size); | |
1475 | } | |
1476 | ||
1477 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1478 | struct device_attribute *attr, | |
1479 | char *buf) | |
1480 | { | |
1481 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1482 | ||
1483 | return sprintf(buf, "%lld\n", (long long)snap->id); | |
1484 | } | |
1485 | ||
1486 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1487 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1488 | ||
1489 | static struct attribute *rbd_snap_attrs[] = { | |
1490 | &dev_attr_snap_size.attr, | |
1491 | &dev_attr_snap_id.attr, | |
1492 | NULL, | |
1493 | }; | |
1494 | ||
1495 | static struct attribute_group rbd_snap_attr_group = { | |
1496 | .attrs = rbd_snap_attrs, | |
1497 | }; | |
1498 | ||
1499 | static void rbd_snap_dev_release(struct device *dev) | |
1500 | { | |
1501 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1502 | kfree(snap->name); | |
1503 | kfree(snap); | |
1504 | } | |
1505 | ||
1506 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
1507 | &rbd_snap_attr_group, | |
1508 | NULL | |
1509 | }; | |
1510 | ||
1511 | static struct device_type rbd_snap_device_type = { | |
1512 | .groups = rbd_snap_attr_groups, | |
1513 | .release = rbd_snap_dev_release, | |
1514 | }; | |
1515 | ||
1516 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
1517 | struct rbd_snap *snap) | |
1518 | { | |
1519 | list_del(&snap->node); | |
1520 | device_unregister(&snap->dev); | |
1521 | } | |
1522 | ||
1523 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
1524 | struct rbd_snap *snap, | |
1525 | struct device *parent) | |
1526 | { | |
1527 | struct device *dev = &snap->dev; | |
1528 | int ret; | |
1529 | ||
1530 | dev->type = &rbd_snap_device_type; | |
1531 | dev->parent = parent; | |
1532 | dev->release = rbd_snap_dev_release; | |
1533 | dev_set_name(dev, "snap_%s", snap->name); | |
1534 | ret = device_register(dev); | |
1535 | ||
1536 | return ret; | |
1537 | } | |
1538 | ||
1539 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
1540 | int i, const char *name, | |
1541 | struct rbd_snap **snapp) | |
1542 | { | |
1543 | int ret; | |
1544 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
1545 | if (!snap) | |
1546 | return -ENOMEM; | |
1547 | snap->name = kstrdup(name, GFP_KERNEL); | |
1548 | snap->size = rbd_dev->header.snap_sizes[i]; | |
1549 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
1550 | if (device_is_registered(&rbd_dev->dev)) { | |
1551 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
1552 | &rbd_dev->dev); | |
1553 | if (ret < 0) | |
1554 | goto err; | |
1555 | } | |
1556 | *snapp = snap; | |
1557 | return 0; | |
1558 | err: | |
1559 | kfree(snap->name); | |
1560 | kfree(snap); | |
1561 | return ret; | |
1562 | } | |
1563 | ||
1564 | /* | |
1565 | * search for the previous snap in a null delimited string list | |
1566 | */ | |
1567 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
1568 | { | |
1569 | if (name < start + 2) | |
1570 | return NULL; | |
1571 | ||
1572 | name -= 2; | |
1573 | while (*name) { | |
1574 | if (name == start) | |
1575 | return start; | |
1576 | name--; | |
1577 | } | |
1578 | return name + 1; | |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * compare the old list of snapshots that we have to what's in the header | |
1583 | * and update it accordingly. Note that the header holds the snapshots | |
1584 | * in a reverse order (from newest to oldest) and we need to go from | |
1585 | * older to new so that we don't get a duplicate snap name when | |
1586 | * doing the process (e.g., removed snapshot and recreated a new | |
1587 | * one with the same name. | |
1588 | */ | |
1589 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
1590 | { | |
1591 | const char *name, *first_name; | |
1592 | int i = rbd_dev->header.total_snaps; | |
1593 | struct rbd_snap *snap, *old_snap = NULL; | |
1594 | int ret; | |
1595 | struct list_head *p, *n; | |
1596 | ||
1597 | first_name = rbd_dev->header.snap_names; | |
1598 | name = first_name + rbd_dev->header.snap_names_len; | |
1599 | ||
1600 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
1601 | u64 cur_id; | |
1602 | ||
1603 | old_snap = list_entry(p, struct rbd_snap, node); | |
1604 | ||
1605 | if (i) | |
1606 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
1607 | ||
1608 | if (!i || old_snap->id < cur_id) { | |
1609 | /* old_snap->id was skipped, thus was removed */ | |
1610 | __rbd_remove_snap_dev(rbd_dev, old_snap); | |
1611 | continue; | |
1612 | } | |
1613 | if (old_snap->id == cur_id) { | |
1614 | /* we have this snapshot already */ | |
1615 | i--; | |
1616 | name = rbd_prev_snap_name(name, first_name); | |
1617 | continue; | |
1618 | } | |
1619 | for (; i > 0; | |
1620 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
1621 | if (!name) { | |
1622 | WARN_ON(1); | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
1626 | /* snapshot removal? handle it above */ | |
1627 | if (cur_id >= old_snap->id) | |
1628 | break; | |
1629 | /* a new snapshot */ | |
1630 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
1631 | if (ret < 0) | |
1632 | return ret; | |
1633 | ||
1634 | /* note that we add it backward so using n and not p */ | |
1635 | list_add(&snap->node, n); | |
1636 | p = &snap->node; | |
1637 | } | |
1638 | } | |
1639 | /* we're done going over the old snap list, just add what's left */ | |
1640 | for (; i > 0; i--) { | |
1641 | name = rbd_prev_snap_name(name, first_name); | |
1642 | if (!name) { | |
1643 | WARN_ON(1); | |
1644 | return -EINVAL; | |
1645 | } | |
1646 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
1647 | if (ret < 0) | |
1648 | return ret; | |
1649 | list_add(&snap->node, &rbd_dev->snaps); | |
1650 | } | |
1651 | ||
1652 | return 0; | |
1653 | } | |
1654 | ||
1655 | ||
1656 | static void rbd_root_dev_release(struct device *dev) | |
1657 | { | |
1658 | } | |
1659 | ||
1660 | static struct device rbd_root_dev = { | |
1661 | .init_name = "rbd", | |
1662 | .release = rbd_root_dev_release, | |
1663 | }; | |
1664 | ||
1665 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) | |
1666 | { | |
1667 | int ret = -ENOMEM; | |
1668 | struct device *dev; | |
1669 | struct rbd_snap *snap; | |
1670 | ||
1671 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1672 | dev = &rbd_dev->dev; | |
1673 | ||
1674 | dev->bus = &rbd_bus_type; | |
1675 | dev->type = &rbd_device_type; | |
1676 | dev->parent = &rbd_root_dev; | |
1677 | dev->release = rbd_dev_release; | |
1678 | dev_set_name(dev, "%d", rbd_dev->id); | |
1679 | ret = device_register(dev); | |
1680 | if (ret < 0) | |
1681 | goto done_free; | |
1682 | ||
1683 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
1684 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
1685 | &rbd_dev->dev); | |
1686 | if (ret < 0) | |
602adf40 YS |
1687 | break; |
1688 | } | |
1689 | ||
1690 | mutex_unlock(&ctl_mutex); | |
dfc5606d YS |
1691 | return 0; |
1692 | done_free: | |
1693 | mutex_unlock(&ctl_mutex); | |
1694 | return ret; | |
602adf40 YS |
1695 | } |
1696 | ||
dfc5606d YS |
1697 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
1698 | { | |
1699 | device_unregister(&rbd_dev->dev); | |
1700 | } | |
1701 | ||
1702 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count) | |
602adf40 YS |
1703 | { |
1704 | struct ceph_osd_client *osdc; | |
1705 | struct rbd_device *rbd_dev; | |
1706 | ssize_t rc = -ENOMEM; | |
1707 | int irc, new_id = 0; | |
1708 | struct list_head *tmp; | |
1709 | char *mon_dev_name; | |
1710 | char *options; | |
1711 | ||
1712 | if (!try_module_get(THIS_MODULE)) | |
1713 | return -ENODEV; | |
1714 | ||
1715 | mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
1716 | if (!mon_dev_name) | |
1717 | goto err_out_mod; | |
1718 | ||
1719 | options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
1720 | if (!options) | |
1721 | goto err_mon_dev; | |
1722 | ||
1723 | /* new rbd_device object */ | |
1724 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); | |
1725 | if (!rbd_dev) | |
1726 | goto err_out_opt; | |
1727 | ||
1728 | /* static rbd_device initialization */ | |
1729 | spin_lock_init(&rbd_dev->lock); | |
1730 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 1731 | INIT_LIST_HEAD(&rbd_dev->snaps); |
602adf40 YS |
1732 | |
1733 | /* generate unique id: find highest unique id, add one */ | |
1734 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1735 | ||
1736 | list_for_each(tmp, &rbd_dev_list) { | |
1737 | struct rbd_device *rbd_dev; | |
1738 | ||
1739 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1740 | if (rbd_dev->id >= new_id) | |
1741 | new_id = rbd_dev->id + 1; | |
1742 | } | |
1743 | ||
1744 | rbd_dev->id = new_id; | |
1745 | ||
1746 | /* add to global list */ | |
1747 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
1748 | ||
1749 | /* parse add command */ | |
1750 | if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
1751 | "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
1752 | "%" __stringify(RBD_MAX_POOL_NAME_LEN) "s " | |
1753 | "%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s" | |
1754 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
1755 | mon_dev_name, options, rbd_dev->pool_name, | |
1756 | rbd_dev->obj, rbd_dev->snap_name) < 4) { | |
1757 | rc = -EINVAL; | |
1758 | goto err_out_slot; | |
1759 | } | |
1760 | ||
1761 | if (rbd_dev->snap_name[0] == 0) | |
1762 | rbd_dev->snap_name[0] = '-'; | |
1763 | ||
1764 | rbd_dev->obj_len = strlen(rbd_dev->obj); | |
1765 | snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s", | |
1766 | rbd_dev->obj, RBD_SUFFIX); | |
1767 | ||
1768 | /* initialize rest of new object */ | |
1769 | snprintf(rbd_dev->name, DEV_NAME_LEN, DRV_NAME "%d", rbd_dev->id); | |
1770 | rc = rbd_get_client(rbd_dev, mon_dev_name, options); | |
1771 | if (rc < 0) | |
1772 | goto err_out_slot; | |
1773 | ||
1774 | mutex_unlock(&ctl_mutex); | |
1775 | ||
1776 | /* pick the pool */ | |
1777 | osdc = &rbd_dev->client->osdc; | |
1778 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); | |
1779 | if (rc < 0) | |
1780 | goto err_out_client; | |
1781 | rbd_dev->poolid = rc; | |
1782 | ||
1783 | /* register our block device */ | |
1784 | irc = register_blkdev(0, rbd_dev->name); | |
1785 | if (irc < 0) { | |
1786 | rc = irc; | |
1787 | goto err_out_client; | |
1788 | } | |
1789 | rbd_dev->major = irc; | |
1790 | ||
dfc5606d YS |
1791 | rc = rbd_bus_add_dev(rbd_dev); |
1792 | if (rc) | |
1793 | goto err_out_disk; | |
602adf40 YS |
1794 | /* set up and announce blkdev mapping */ |
1795 | rc = rbd_init_disk(rbd_dev); | |
1796 | if (rc) | |
1797 | goto err_out_blkdev; | |
1798 | ||
1799 | return count; | |
1800 | ||
1801 | err_out_blkdev: | |
1802 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
dfc5606d YS |
1803 | err_out_disk: |
1804 | rbd_free_disk(rbd_dev); | |
602adf40 YS |
1805 | err_out_client: |
1806 | rbd_put_client(rbd_dev); | |
1807 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1808 | err_out_slot: | |
1809 | list_del_init(&rbd_dev->node); | |
1810 | mutex_unlock(&ctl_mutex); | |
1811 | ||
1812 | kfree(rbd_dev); | |
1813 | err_out_opt: | |
1814 | kfree(options); | |
1815 | err_mon_dev: | |
1816 | kfree(mon_dev_name); | |
1817 | err_out_mod: | |
1818 | dout("Error adding device %s\n", buf); | |
1819 | module_put(THIS_MODULE); | |
1820 | return rc; | |
1821 | } | |
1822 | ||
1823 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
1824 | { | |
1825 | struct list_head *tmp; | |
1826 | struct rbd_device *rbd_dev; | |
1827 | ||
1828 | list_for_each(tmp, &rbd_dev_list) { | |
1829 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1830 | if (rbd_dev->id == id) | |
1831 | return rbd_dev; | |
1832 | } | |
1833 | return NULL; | |
1834 | } | |
1835 | ||
dfc5606d | 1836 | static void rbd_dev_release(struct device *dev) |
602adf40 | 1837 | { |
dfc5606d YS |
1838 | struct rbd_device *rbd_dev = |
1839 | container_of(dev, struct rbd_device, dev); | |
602adf40 YS |
1840 | |
1841 | rbd_put_client(rbd_dev); | |
1842 | ||
1843 | /* clean up and free blkdev */ | |
1844 | rbd_free_disk(rbd_dev); | |
1845 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
1846 | kfree(rbd_dev); | |
1847 | ||
1848 | /* release module ref */ | |
1849 | module_put(THIS_MODULE); | |
602adf40 YS |
1850 | } |
1851 | ||
dfc5606d YS |
1852 | static ssize_t rbd_remove(struct bus_type *bus, |
1853 | const char *buf, | |
1854 | size_t count) | |
602adf40 YS |
1855 | { |
1856 | struct rbd_device *rbd_dev = NULL; | |
1857 | int target_id, rc; | |
1858 | unsigned long ul; | |
1859 | int ret = count; | |
1860 | ||
1861 | rc = strict_strtoul(buf, 10, &ul); | |
1862 | if (rc) | |
1863 | return rc; | |
1864 | ||
1865 | /* convert to int; abort if we lost anything in the conversion */ | |
1866 | target_id = (int) ul; | |
1867 | if (target_id != ul) | |
1868 | return -EINVAL; | |
1869 | ||
1870 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1871 | ||
1872 | rbd_dev = __rbd_get_dev(target_id); | |
1873 | if (!rbd_dev) { | |
1874 | ret = -ENOENT; | |
1875 | goto done; | |
1876 | } | |
1877 | ||
dfc5606d YS |
1878 | list_del_init(&rbd_dev->node); |
1879 | ||
1880 | __rbd_remove_all_snaps(rbd_dev); | |
1881 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
1882 | |
1883 | done: | |
1884 | mutex_unlock(&ctl_mutex); | |
1885 | return ret; | |
1886 | } | |
1887 | ||
dfc5606d YS |
1888 | static ssize_t rbd_snap_add(struct device *dev, |
1889 | struct device_attribute *attr, | |
1890 | const char *buf, | |
1891 | size_t count) | |
602adf40 | 1892 | { |
dfc5606d YS |
1893 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1894 | int ret; | |
1895 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
1896 | if (!name) |
1897 | return -ENOMEM; | |
1898 | ||
dfc5606d | 1899 | snprintf(name, count, "%s", buf); |
602adf40 YS |
1900 | |
1901 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1902 | ||
602adf40 YS |
1903 | ret = rbd_header_add_snap(rbd_dev, |
1904 | name, GFP_KERNEL); | |
1905 | if (ret < 0) | |
1906 | goto done_unlock; | |
1907 | ||
dfc5606d | 1908 | ret = __rbd_update_snaps(rbd_dev); |
602adf40 YS |
1909 | if (ret < 0) |
1910 | goto done_unlock; | |
1911 | ||
1912 | ret = count; | |
1913 | done_unlock: | |
1914 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
1915 | kfree(name); |
1916 | return ret; | |
1917 | } | |
1918 | ||
dfc5606d YS |
1919 | static ssize_t rbd_snap_rollback(struct device *dev, |
1920 | struct device_attribute *attr, | |
1921 | const char *buf, | |
1922 | size_t count) | |
602adf40 | 1923 | { |
dfc5606d YS |
1924 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1925 | int ret; | |
602adf40 | 1926 | u64 snapid; |
602adf40 | 1927 | u64 cur_ofs; |
dfc5606d YS |
1928 | char *seg_name = NULL; |
1929 | char *snap_name = kmalloc(count + 1, GFP_KERNEL); | |
1930 | ret = -ENOMEM; | |
1931 | if (!snap_name) | |
1932 | return ret; | |
602adf40 YS |
1933 | |
1934 | /* parse snaps add command */ | |
dfc5606d | 1935 | snprintf(snap_name, count, "%s", buf); |
602adf40 YS |
1936 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
1937 | if (!seg_name) | |
dfc5606d | 1938 | goto done; |
602adf40 YS |
1939 | |
1940 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1941 | ||
602adf40 YS |
1942 | ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL); |
1943 | if (ret < 0) | |
1944 | goto done_unlock; | |
1945 | ||
1946 | dout("snapid=%lld\n", snapid); | |
1947 | ||
1948 | cur_ofs = 0; | |
1949 | while (cur_ofs < rbd_dev->header.image_size) { | |
1950 | cur_ofs += rbd_get_segment(&rbd_dev->header, | |
1951 | rbd_dev->obj, | |
1952 | cur_ofs, (u64)-1, | |
1953 | seg_name, NULL); | |
1954 | dout("seg_name=%s\n", seg_name); | |
1955 | ||
1956 | ret = rbd_req_sync_rollback_obj(rbd_dev, snapid, seg_name); | |
1957 | if (ret < 0) | |
1958 | pr_warning("could not roll back obj %s err=%d\n", | |
1959 | seg_name, ret); | |
1960 | } | |
1961 | ||
dfc5606d | 1962 | ret = __rbd_update_snaps(rbd_dev); |
602adf40 YS |
1963 | if (ret < 0) |
1964 | goto done_unlock; | |
1965 | ||
1966 | ret = count; | |
1967 | ||
1968 | done_unlock: | |
1969 | mutex_unlock(&ctl_mutex); | |
dfc5606d | 1970 | done: |
602adf40 | 1971 | kfree(seg_name); |
dfc5606d | 1972 | kfree(snap_name); |
602adf40 YS |
1973 | |
1974 | return ret; | |
1975 | } | |
1976 | ||
dfc5606d YS |
1977 | static struct bus_attribute rbd_bus_attrs[] = { |
1978 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
1979 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
602adf40 YS |
1980 | __ATTR_NULL |
1981 | }; | |
1982 | ||
1983 | /* | |
1984 | * create control files in sysfs | |
dfc5606d | 1985 | * /sys/bus/rbd/... |
602adf40 YS |
1986 | */ |
1987 | static int rbd_sysfs_init(void) | |
1988 | { | |
dfc5606d | 1989 | int ret; |
602adf40 | 1990 | |
dfc5606d | 1991 | rbd_bus_type.bus_attrs = rbd_bus_attrs; |
602adf40 | 1992 | |
dfc5606d YS |
1993 | ret = bus_register(&rbd_bus_type); |
1994 | if (ret < 0) | |
1995 | return ret; | |
602adf40 | 1996 | |
dfc5606d | 1997 | ret = device_register(&rbd_root_dev); |
602adf40 | 1998 | |
602adf40 YS |
1999 | return ret; |
2000 | } | |
2001 | ||
2002 | static void rbd_sysfs_cleanup(void) | |
2003 | { | |
dfc5606d YS |
2004 | device_unregister(&rbd_root_dev); |
2005 | bus_unregister(&rbd_bus_type); | |
602adf40 YS |
2006 | } |
2007 | ||
2008 | int __init rbd_init(void) | |
2009 | { | |
2010 | int rc; | |
2011 | ||
2012 | rc = rbd_sysfs_init(); | |
2013 | if (rc) | |
2014 | return rc; | |
2015 | spin_lock_init(&node_lock); | |
2016 | pr_info("loaded " DRV_NAME_LONG "\n"); | |
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | void __exit rbd_exit(void) | |
2021 | { | |
2022 | rbd_sysfs_cleanup(); | |
2023 | } | |
2024 | ||
2025 | module_init(rbd_init); | |
2026 | module_exit(rbd_exit); | |
2027 | ||
2028 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2029 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2030 | MODULE_DESCRIPTION("rados block device"); | |
2031 | ||
2032 | /* following authorship retained from original osdblk.c */ | |
2033 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2034 | ||
2035 | MODULE_LICENSE("GPL"); |