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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 | ||
24 | Instructions for use | |
25 | -------------------- | |
26 | ||
27 | 1) Map a Linux block device to an existing rbd image. | |
28 | ||
29 | Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name] | |
30 | ||
31 | $ echo "192.168.0.1 name=admin rbd foo" > /sys/class/rbd/add | |
32 | ||
33 | The snapshot name can be "-" or omitted to map the image read/write. | |
34 | ||
35 | 2) List all active blkdev<->object mappings. | |
36 | ||
37 | In this example, we have performed step #1 twice, creating two blkdevs, | |
38 | mapped to two separate rados objects in the rados rbd pool | |
39 | ||
40 | $ cat /sys/class/rbd/list | |
41 | #id major client_name pool name snap KB | |
42 | 0 254 client4143 rbd foo - 1024000 | |
43 | ||
44 | The columns, in order, are: | |
45 | - blkdev unique id | |
46 | - blkdev assigned major | |
47 | - rados client id | |
48 | - rados pool name | |
49 | - rados block device name | |
50 | - mapped snapshot ("-" if none) | |
51 | - device size in KB | |
52 | ||
53 | ||
54 | 3) Create a snapshot. | |
55 | ||
56 | Usage: <blkdev id> <snapname> | |
57 | ||
58 | $ echo "0 mysnap" > /sys/class/rbd/snap_create | |
59 | ||
60 | ||
61 | 4) Listing a snapshot. | |
62 | ||
63 | $ cat /sys/class/rbd/snaps_list | |
64 | #id snap KB | |
65 | 0 - 1024000 (*) | |
66 | 0 foo 1024000 | |
67 | ||
68 | The columns, in order, are: | |
69 | - blkdev unique id | |
70 | - snapshot name, '-' means none (active read/write version) | |
71 | - size of device at time of snapshot | |
72 | - the (*) indicates this is the active version | |
73 | ||
74 | 5) Rollback to snapshot. | |
75 | ||
76 | Usage: <blkdev id> <snapname> | |
77 | ||
78 | $ echo "0 mysnap" > /sys/class/rbd/snap_rollback | |
79 | ||
80 | ||
81 | 6) Mapping an image using snapshot. | |
82 | ||
83 | A snapshot mapping is read-only. This is being done by passing | |
84 | snap=<snapname> to the options when adding a device. | |
85 | ||
86 | $ echo "192.168.0.1 name=admin,snap=mysnap rbd foo" > /sys/class/rbd/add | |
87 | ||
88 | ||
89 | 7) Remove an active blkdev<->rbd image mapping. | |
90 | ||
91 | In this example, we remove the mapping with blkdev unique id 1. | |
92 | ||
93 | $ echo 1 > /sys/class/rbd/remove | |
94 | ||
95 | ||
96 | NOTE: The actual creation and deletion of rados objects is outside the scope | |
97 | of this driver. | |
98 | ||
99 | */ | |
100 | ||
101 | #include <linux/ceph/libceph.h> | |
102 | #include <linux/ceph/osd_client.h> | |
103 | #include <linux/ceph/mon_client.h> | |
104 | #include <linux/ceph/decode.h> | |
105 | ||
106 | #include <linux/kernel.h> | |
107 | #include <linux/device.h> | |
108 | #include <linux/module.h> | |
109 | #include <linux/fs.h> | |
110 | #include <linux/blkdev.h> | |
111 | ||
112 | #include "rbd_types.h" | |
113 | ||
114 | #define DRV_NAME "rbd" | |
115 | #define DRV_NAME_LONG "rbd (rados block device)" | |
116 | ||
117 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
118 | ||
119 | #define RBD_MAX_MD_NAME_LEN (96 + sizeof(RBD_SUFFIX)) | |
120 | #define RBD_MAX_POOL_NAME_LEN 64 | |
121 | #define RBD_MAX_SNAP_NAME_LEN 32 | |
122 | #define RBD_MAX_OPT_LEN 1024 | |
123 | ||
124 | #define RBD_SNAP_HEAD_NAME "-" | |
125 | ||
126 | #define DEV_NAME_LEN 32 | |
127 | ||
128 | /* | |
129 | * block device image metadata (in-memory version) | |
130 | */ | |
131 | struct rbd_image_header { | |
132 | u64 image_size; | |
133 | char block_name[32]; | |
134 | __u8 obj_order; | |
135 | __u8 crypt_type; | |
136 | __u8 comp_type; | |
137 | struct rw_semaphore snap_rwsem; | |
138 | struct ceph_snap_context *snapc; | |
139 | size_t snap_names_len; | |
140 | u64 snap_seq; | |
141 | u32 total_snaps; | |
142 | ||
143 | char *snap_names; | |
144 | u64 *snap_sizes; | |
145 | }; | |
146 | ||
147 | /* | |
148 | * an instance of the client. multiple devices may share a client. | |
149 | */ | |
150 | struct rbd_client { | |
151 | struct ceph_client *client; | |
152 | struct kref kref; | |
153 | struct list_head node; | |
154 | }; | |
155 | ||
156 | /* | |
157 | * a single io request | |
158 | */ | |
159 | struct rbd_request { | |
160 | struct request *rq; /* blk layer request */ | |
161 | struct bio *bio; /* cloned bio */ | |
162 | struct page **pages; /* list of used pages */ | |
163 | u64 len; | |
164 | }; | |
165 | ||
166 | /* | |
167 | * a single device | |
168 | */ | |
169 | struct rbd_device { | |
170 | int id; /* blkdev unique id */ | |
171 | ||
172 | int major; /* blkdev assigned major */ | |
173 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
174 | struct request_queue *q; | |
175 | ||
176 | struct ceph_client *client; | |
177 | struct rbd_client *rbd_client; | |
178 | ||
179 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
180 | ||
181 | spinlock_t lock; /* queue lock */ | |
182 | ||
183 | struct rbd_image_header header; | |
184 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ | |
185 | int obj_len; | |
186 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ | |
187 | char pool_name[RBD_MAX_POOL_NAME_LEN]; | |
188 | int poolid; | |
189 | ||
190 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; | |
191 | u32 cur_snap; /* index+1 of current snapshot within snap context | |
192 | 0 - for the head */ | |
193 | int read_only; | |
194 | ||
195 | struct list_head node; | |
196 | }; | |
197 | ||
198 | static spinlock_t node_lock; /* protects client get/put */ | |
199 | ||
200 | static struct class *class_rbd; /* /sys/class/rbd */ | |
201 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ | |
202 | static LIST_HEAD(rbd_dev_list); /* devices */ | |
203 | static LIST_HEAD(rbd_client_list); /* clients */ | |
204 | ||
205 | ||
206 | static int rbd_open(struct block_device *bdev, fmode_t mode) | |
207 | { | |
208 | struct gendisk *disk = bdev->bd_disk; | |
209 | struct rbd_device *rbd_dev = disk->private_data; | |
210 | ||
211 | set_device_ro(bdev, rbd_dev->read_only); | |
212 | ||
213 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
214 | return -EROFS; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static const struct block_device_operations rbd_bd_ops = { | |
220 | .owner = THIS_MODULE, | |
221 | .open = rbd_open, | |
222 | }; | |
223 | ||
224 | /* | |
225 | * Initialize an rbd client instance. | |
226 | * We own *opt. | |
227 | */ | |
228 | static struct rbd_client *rbd_client_create(struct ceph_options *opt) | |
229 | { | |
230 | struct rbd_client *rbdc; | |
231 | int ret = -ENOMEM; | |
232 | ||
233 | dout("rbd_client_create\n"); | |
234 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
235 | if (!rbdc) | |
236 | goto out_opt; | |
237 | ||
238 | kref_init(&rbdc->kref); | |
239 | INIT_LIST_HEAD(&rbdc->node); | |
240 | ||
241 | rbdc->client = ceph_create_client(opt, rbdc); | |
242 | if (IS_ERR(rbdc->client)) | |
243 | goto out_rbdc; | |
28f259b7 | 244 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
602adf40 YS |
245 | |
246 | ret = ceph_open_session(rbdc->client); | |
247 | if (ret < 0) | |
248 | goto out_err; | |
249 | ||
250 | spin_lock(&node_lock); | |
251 | list_add_tail(&rbdc->node, &rbd_client_list); | |
252 | spin_unlock(&node_lock); | |
253 | ||
254 | dout("rbd_client_create created %p\n", rbdc); | |
255 | return rbdc; | |
256 | ||
257 | out_err: | |
258 | ceph_destroy_client(rbdc->client); | |
602adf40 YS |
259 | out_rbdc: |
260 | kfree(rbdc); | |
261 | out_opt: | |
28f259b7 VK |
262 | if (opt) |
263 | ceph_destroy_options(opt); | |
264 | return ERR_PTR(ret); | |
602adf40 YS |
265 | } |
266 | ||
267 | /* | |
268 | * Find a ceph client with specific addr and configuration. | |
269 | */ | |
270 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) | |
271 | { | |
272 | struct rbd_client *client_node; | |
273 | ||
274 | if (opt->flags & CEPH_OPT_NOSHARE) | |
275 | return NULL; | |
276 | ||
277 | list_for_each_entry(client_node, &rbd_client_list, node) | |
278 | if (ceph_compare_options(opt, client_node->client) == 0) | |
279 | return client_node; | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Get a ceph client with specific addr and configuration, if one does | |
285 | * not exist create it. | |
286 | */ | |
287 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, | |
288 | char *options) | |
289 | { | |
290 | struct rbd_client *rbdc; | |
291 | struct ceph_options *opt; | |
292 | int ret; | |
293 | ||
294 | ret = ceph_parse_options(&opt, options, mon_addr, | |
295 | mon_addr + strlen(mon_addr), NULL, NULL); | |
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
299 | spin_lock(&node_lock); | |
300 | rbdc = __rbd_client_find(opt); | |
301 | if (rbdc) { | |
302 | ceph_destroy_options(opt); | |
303 | ||
304 | /* using an existing client */ | |
305 | kref_get(&rbdc->kref); | |
306 | rbd_dev->rbd_client = rbdc; | |
307 | rbd_dev->client = rbdc->client; | |
308 | spin_unlock(&node_lock); | |
309 | return 0; | |
310 | } | |
311 | spin_unlock(&node_lock); | |
312 | ||
313 | rbdc = rbd_client_create(opt); | |
314 | if (IS_ERR(rbdc)) | |
315 | return PTR_ERR(rbdc); | |
316 | ||
317 | rbd_dev->rbd_client = rbdc; | |
318 | rbd_dev->client = rbdc->client; | |
319 | return 0; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Destroy ceph client | |
324 | */ | |
325 | static void rbd_client_release(struct kref *kref) | |
326 | { | |
327 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
328 | ||
329 | dout("rbd_release_client %p\n", rbdc); | |
330 | spin_lock(&node_lock); | |
331 | list_del(&rbdc->node); | |
332 | spin_unlock(&node_lock); | |
333 | ||
334 | ceph_destroy_client(rbdc->client); | |
335 | kfree(rbdc); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
340 | * it. | |
341 | */ | |
342 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
343 | { | |
344 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
345 | rbd_dev->rbd_client = NULL; | |
346 | rbd_dev->client = NULL; | |
347 | } | |
348 | ||
349 | ||
350 | /* | |
351 | * Create a new header structure, translate header format from the on-disk | |
352 | * header. | |
353 | */ | |
354 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
355 | struct rbd_image_header_ondisk *ondisk, | |
356 | int allocated_snaps, | |
357 | gfp_t gfp_flags) | |
358 | { | |
359 | int i; | |
360 | u32 snap_count = le32_to_cpu(ondisk->snap_count); | |
361 | int ret = -ENOMEM; | |
362 | ||
363 | init_rwsem(&header->snap_rwsem); | |
364 | ||
365 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); | |
366 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + | |
367 | snap_count * | |
368 | sizeof(struct rbd_image_snap_ondisk), | |
369 | gfp_flags); | |
370 | if (!header->snapc) | |
371 | return -ENOMEM; | |
372 | if (snap_count) { | |
373 | header->snap_names = kmalloc(header->snap_names_len, | |
374 | GFP_KERNEL); | |
375 | if (!header->snap_names) | |
376 | goto err_snapc; | |
377 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
378 | GFP_KERNEL); | |
379 | if (!header->snap_sizes) | |
380 | goto err_names; | |
381 | } else { | |
382 | header->snap_names = NULL; | |
383 | header->snap_sizes = NULL; | |
384 | } | |
385 | memcpy(header->block_name, ondisk->block_name, | |
386 | sizeof(ondisk->block_name)); | |
387 | ||
388 | header->image_size = le64_to_cpu(ondisk->image_size); | |
389 | header->obj_order = ondisk->options.order; | |
390 | header->crypt_type = ondisk->options.crypt_type; | |
391 | header->comp_type = ondisk->options.comp_type; | |
392 | ||
393 | atomic_set(&header->snapc->nref, 1); | |
394 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
395 | header->snapc->num_snaps = snap_count; | |
396 | header->total_snaps = snap_count; | |
397 | ||
398 | if (snap_count && | |
399 | allocated_snaps == snap_count) { | |
400 | for (i = 0; i < snap_count; i++) { | |
401 | header->snapc->snaps[i] = | |
402 | le64_to_cpu(ondisk->snaps[i].id); | |
403 | header->snap_sizes[i] = | |
404 | le64_to_cpu(ondisk->snaps[i].image_size); | |
405 | } | |
406 | ||
407 | /* copy snapshot names */ | |
408 | memcpy(header->snap_names, &ondisk->snaps[i], | |
409 | header->snap_names_len); | |
410 | } | |
411 | ||
412 | return 0; | |
413 | ||
414 | err_names: | |
415 | kfree(header->snap_names); | |
416 | err_snapc: | |
417 | kfree(header->snapc); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | static int snap_index(struct rbd_image_header *header, int snap_num) | |
422 | { | |
423 | return header->total_snaps - snap_num; | |
424 | } | |
425 | ||
426 | static u64 cur_snap_id(struct rbd_device *rbd_dev) | |
427 | { | |
428 | struct rbd_image_header *header = &rbd_dev->header; | |
429 | ||
430 | if (!rbd_dev->cur_snap) | |
431 | return 0; | |
432 | ||
433 | return header->snapc->snaps[snap_index(header, rbd_dev->cur_snap)]; | |
434 | } | |
435 | ||
436 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, | |
437 | u64 *seq, u64 *size) | |
438 | { | |
439 | int i; | |
440 | char *p = header->snap_names; | |
441 | ||
442 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { | |
443 | if (strcmp(snap_name, p) == 0) | |
444 | break; | |
445 | } | |
446 | if (i == header->total_snaps) | |
447 | return -ENOENT; | |
448 | if (seq) | |
449 | *seq = header->snapc->snaps[i]; | |
450 | ||
451 | if (size) | |
452 | *size = header->snap_sizes[i]; | |
453 | ||
454 | return i; | |
455 | } | |
456 | ||
457 | static int rbd_header_set_snap(struct rbd_device *dev, | |
458 | const char *snap_name, | |
459 | u64 *size) | |
460 | { | |
461 | struct rbd_image_header *header = &dev->header; | |
462 | struct ceph_snap_context *snapc = header->snapc; | |
463 | int ret = -ENOENT; | |
464 | ||
465 | down_write(&header->snap_rwsem); | |
466 | ||
467 | if (!snap_name || | |
468 | !*snap_name || | |
469 | strcmp(snap_name, "-") == 0 || | |
470 | strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) { | |
471 | if (header->total_snaps) | |
472 | snapc->seq = header->snap_seq; | |
473 | else | |
474 | snapc->seq = 0; | |
475 | dev->cur_snap = 0; | |
476 | dev->read_only = 0; | |
477 | if (size) | |
478 | *size = header->image_size; | |
479 | } else { | |
480 | ret = snap_by_name(header, snap_name, &snapc->seq, size); | |
481 | if (ret < 0) | |
482 | goto done; | |
483 | ||
484 | dev->cur_snap = header->total_snaps - ret; | |
485 | dev->read_only = 1; | |
486 | } | |
487 | ||
488 | ret = 0; | |
489 | done: | |
490 | up_write(&header->snap_rwsem); | |
491 | return ret; | |
492 | } | |
493 | ||
494 | static void rbd_header_free(struct rbd_image_header *header) | |
495 | { | |
496 | kfree(header->snapc); | |
497 | kfree(header->snap_names); | |
498 | kfree(header->snap_sizes); | |
499 | } | |
500 | ||
501 | /* | |
502 | * get the actual striped segment name, offset and length | |
503 | */ | |
504 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
505 | const char *block_name, | |
506 | u64 ofs, u64 len, | |
507 | char *seg_name, u64 *segofs) | |
508 | { | |
509 | u64 seg = ofs >> header->obj_order; | |
510 | ||
511 | if (seg_name) | |
512 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
513 | "%s.%012llx", block_name, seg); | |
514 | ||
515 | ofs = ofs & ((1 << header->obj_order) - 1); | |
516 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
517 | ||
518 | if (segofs) | |
519 | *segofs = ofs; | |
520 | ||
521 | return len; | |
522 | } | |
523 | ||
524 | /* | |
525 | * bio helpers | |
526 | */ | |
527 | ||
528 | static void bio_chain_put(struct bio *chain) | |
529 | { | |
530 | struct bio *tmp; | |
531 | ||
532 | while (chain) { | |
533 | tmp = chain; | |
534 | chain = chain->bi_next; | |
535 | bio_put(tmp); | |
536 | } | |
537 | } | |
538 | ||
539 | /* | |
540 | * zeros a bio chain, starting at specific offset | |
541 | */ | |
542 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
543 | { | |
544 | struct bio_vec *bv; | |
545 | unsigned long flags; | |
546 | void *buf; | |
547 | int i; | |
548 | int pos = 0; | |
549 | ||
550 | while (chain) { | |
551 | bio_for_each_segment(bv, chain, i) { | |
552 | if (pos + bv->bv_len > start_ofs) { | |
553 | int remainder = max(start_ofs - pos, 0); | |
554 | buf = bvec_kmap_irq(bv, &flags); | |
555 | memset(buf + remainder, 0, | |
556 | bv->bv_len - remainder); | |
557 | bvec_kunmap_irq(bv, &flags); | |
558 | } | |
559 | pos += bv->bv_len; | |
560 | } | |
561 | ||
562 | chain = chain->bi_next; | |
563 | } | |
564 | } | |
565 | ||
566 | /* | |
567 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
568 | * might return a bio_pair that will need to be released. | |
569 | */ | |
570 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
571 | struct bio_pair **bp, | |
572 | int len, gfp_t gfpmask) | |
573 | { | |
574 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
575 | int total = 0; | |
576 | ||
577 | if (*bp) { | |
578 | bio_pair_release(*bp); | |
579 | *bp = NULL; | |
580 | } | |
581 | ||
582 | while (old_chain && (total < len)) { | |
583 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
584 | if (!tmp) | |
585 | goto err_out; | |
586 | ||
587 | if (total + old_chain->bi_size > len) { | |
588 | struct bio_pair *bp; | |
589 | ||
590 | /* | |
591 | * this split can only happen with a single paged bio, | |
592 | * split_bio will BUG_ON if this is not the case | |
593 | */ | |
594 | dout("bio_chain_clone split! total=%d remaining=%d" | |
595 | "bi_size=%d\n", | |
596 | (int)total, (int)len-total, | |
597 | (int)old_chain->bi_size); | |
598 | ||
599 | /* split the bio. We'll release it either in the next | |
600 | call, or it will have to be released outside */ | |
601 | bp = bio_split(old_chain, (len - total) / 512ULL); | |
602 | if (!bp) | |
603 | goto err_out; | |
604 | ||
605 | __bio_clone(tmp, &bp->bio1); | |
606 | ||
607 | *next = &bp->bio2; | |
608 | } else { | |
609 | __bio_clone(tmp, old_chain); | |
610 | *next = old_chain->bi_next; | |
611 | } | |
612 | ||
613 | tmp->bi_bdev = NULL; | |
614 | gfpmask &= ~__GFP_WAIT; | |
615 | tmp->bi_next = NULL; | |
616 | ||
617 | if (!new_chain) { | |
618 | new_chain = tail = tmp; | |
619 | } else { | |
620 | tail->bi_next = tmp; | |
621 | tail = tmp; | |
622 | } | |
623 | old_chain = old_chain->bi_next; | |
624 | ||
625 | total += tmp->bi_size; | |
626 | } | |
627 | ||
628 | BUG_ON(total < len); | |
629 | ||
630 | if (tail) | |
631 | tail->bi_next = NULL; | |
632 | ||
633 | *old = old_chain; | |
634 | ||
635 | return new_chain; | |
636 | ||
637 | err_out: | |
638 | dout("bio_chain_clone with err\n"); | |
639 | bio_chain_put(new_chain); | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | /* | |
644 | * helpers for osd request op vectors. | |
645 | */ | |
646 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
647 | int num_ops, | |
648 | int opcode, | |
649 | u32 payload_len) | |
650 | { | |
651 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
652 | GFP_NOIO); | |
653 | if (!*ops) | |
654 | return -ENOMEM; | |
655 | (*ops)[0].op = opcode; | |
656 | /* | |
657 | * op extent offset and length will be set later on | |
658 | * in calc_raw_layout() | |
659 | */ | |
660 | (*ops)[0].payload_len = payload_len; | |
661 | return 0; | |
662 | } | |
663 | ||
664 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
665 | { | |
666 | kfree(ops); | |
667 | } | |
668 | ||
669 | /* | |
670 | * Send ceph osd request | |
671 | */ | |
672 | static int rbd_do_request(struct request *rq, | |
673 | struct rbd_device *dev, | |
674 | struct ceph_snap_context *snapc, | |
675 | u64 snapid, | |
676 | const char *obj, u64 ofs, u64 len, | |
677 | struct bio *bio, | |
678 | struct page **pages, | |
679 | int num_pages, | |
680 | int flags, | |
681 | struct ceph_osd_req_op *ops, | |
682 | int num_reply, | |
683 | void (*rbd_cb)(struct ceph_osd_request *req, | |
684 | struct ceph_msg *msg)) | |
685 | { | |
686 | struct ceph_osd_request *req; | |
687 | struct ceph_file_layout *layout; | |
688 | int ret; | |
689 | u64 bno; | |
690 | struct timespec mtime = CURRENT_TIME; | |
691 | struct rbd_request *req_data; | |
692 | struct ceph_osd_request_head *reqhead; | |
693 | struct rbd_image_header *header = &dev->header; | |
694 | ||
695 | ret = -ENOMEM; | |
696 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); | |
697 | if (!req_data) | |
698 | goto done; | |
699 | ||
700 | dout("rbd_do_request len=%lld ofs=%lld\n", len, ofs); | |
701 | ||
702 | down_read(&header->snap_rwsem); | |
703 | ||
704 | req = ceph_osdc_alloc_request(&dev->client->osdc, flags, | |
705 | snapc, | |
706 | ops, | |
707 | false, | |
708 | GFP_NOIO, pages, bio); | |
709 | if (IS_ERR(req)) { | |
710 | up_read(&header->snap_rwsem); | |
711 | ret = PTR_ERR(req); | |
712 | goto done_pages; | |
713 | } | |
714 | ||
715 | req->r_callback = rbd_cb; | |
716 | ||
717 | req_data->rq = rq; | |
718 | req_data->bio = bio; | |
719 | req_data->pages = pages; | |
720 | req_data->len = len; | |
721 | ||
722 | req->r_priv = req_data; | |
723 | ||
724 | reqhead = req->r_request->front.iov_base; | |
725 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
726 | ||
727 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); | |
728 | req->r_oid_len = strlen(req->r_oid); | |
729 | ||
730 | layout = &req->r_file_layout; | |
731 | memset(layout, 0, sizeof(*layout)); | |
732 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
733 | layout->fl_stripe_count = cpu_to_le32(1); | |
734 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
735 | layout->fl_pg_preferred = cpu_to_le32(-1); | |
736 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); | |
737 | ceph_calc_raw_layout(&dev->client->osdc, layout, snapid, | |
738 | ofs, &len, &bno, req, ops); | |
739 | ||
740 | ceph_osdc_build_request(req, ofs, &len, | |
741 | ops, | |
742 | snapc, | |
743 | &mtime, | |
744 | req->r_oid, req->r_oid_len); | |
745 | up_read(&header->snap_rwsem); | |
746 | ||
747 | ret = ceph_osdc_start_request(&dev->client->osdc, req, false); | |
748 | if (ret < 0) | |
749 | goto done_err; | |
750 | ||
751 | if (!rbd_cb) { | |
752 | ret = ceph_osdc_wait_request(&dev->client->osdc, req); | |
753 | ceph_osdc_put_request(req); | |
754 | } | |
755 | return ret; | |
756 | ||
757 | done_err: | |
758 | bio_chain_put(req_data->bio); | |
759 | ceph_osdc_put_request(req); | |
760 | done_pages: | |
761 | kfree(req_data); | |
762 | done: | |
763 | if (rq) | |
764 | blk_end_request(rq, ret, len); | |
765 | return ret; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Ceph osd op callback | |
770 | */ | |
771 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
772 | { | |
773 | struct rbd_request *req_data = req->r_priv; | |
774 | struct ceph_osd_reply_head *replyhead; | |
775 | struct ceph_osd_op *op; | |
776 | __s32 rc; | |
777 | u64 bytes; | |
778 | int read_op; | |
779 | ||
780 | /* parse reply */ | |
781 | replyhead = msg->front.iov_base; | |
782 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
783 | op = (void *)(replyhead + 1); | |
784 | rc = le32_to_cpu(replyhead->result); | |
785 | bytes = le64_to_cpu(op->extent.length); | |
786 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); | |
787 | ||
788 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
789 | ||
790 | if (rc == -ENOENT && read_op) { | |
791 | zero_bio_chain(req_data->bio, 0); | |
792 | rc = 0; | |
793 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
794 | zero_bio_chain(req_data->bio, bytes); | |
795 | bytes = req_data->len; | |
796 | } | |
797 | ||
798 | blk_end_request(req_data->rq, rc, bytes); | |
799 | ||
800 | if (req_data->bio) | |
801 | bio_chain_put(req_data->bio); | |
802 | ||
803 | ceph_osdc_put_request(req); | |
804 | kfree(req_data); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Do a synchronous ceph osd operation | |
809 | */ | |
810 | static int rbd_req_sync_op(struct rbd_device *dev, | |
811 | struct ceph_snap_context *snapc, | |
812 | u64 snapid, | |
813 | int opcode, | |
814 | int flags, | |
815 | struct ceph_osd_req_op *orig_ops, | |
816 | int num_reply, | |
817 | const char *obj, | |
818 | u64 ofs, u64 len, | |
819 | char *buf) | |
820 | { | |
821 | int ret; | |
822 | struct page **pages; | |
823 | int num_pages; | |
824 | struct ceph_osd_req_op *ops = orig_ops; | |
825 | u32 payload_len; | |
826 | ||
827 | num_pages = calc_pages_for(ofs , len); | |
828 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
829 | if (IS_ERR(pages)) |
830 | return PTR_ERR(pages); | |
602adf40 YS |
831 | |
832 | if (!orig_ops) { | |
833 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
834 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
835 | if (ret < 0) | |
836 | goto done; | |
837 | ||
838 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
839 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
840 | if (ret < 0) | |
841 | goto done_ops; | |
842 | } | |
843 | } | |
844 | ||
845 | ret = rbd_do_request(NULL, dev, snapc, snapid, | |
846 | obj, ofs, len, NULL, | |
847 | pages, num_pages, | |
848 | flags, | |
849 | ops, | |
850 | 2, | |
851 | NULL); | |
852 | if (ret < 0) | |
853 | goto done_ops; | |
854 | ||
855 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
856 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
857 | ||
858 | done_ops: | |
859 | if (!orig_ops) | |
860 | rbd_destroy_ops(ops); | |
861 | done: | |
862 | ceph_release_page_vector(pages, num_pages); | |
863 | return ret; | |
864 | } | |
865 | ||
866 | /* | |
867 | * Do an asynchronous ceph osd operation | |
868 | */ | |
869 | static int rbd_do_op(struct request *rq, | |
870 | struct rbd_device *rbd_dev , | |
871 | struct ceph_snap_context *snapc, | |
872 | u64 snapid, | |
873 | int opcode, int flags, int num_reply, | |
874 | u64 ofs, u64 len, | |
875 | struct bio *bio) | |
876 | { | |
877 | char *seg_name; | |
878 | u64 seg_ofs; | |
879 | u64 seg_len; | |
880 | int ret; | |
881 | struct ceph_osd_req_op *ops; | |
882 | u32 payload_len; | |
883 | ||
884 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
885 | if (!seg_name) | |
886 | return -ENOMEM; | |
887 | ||
888 | seg_len = rbd_get_segment(&rbd_dev->header, | |
889 | rbd_dev->header.block_name, | |
890 | ofs, len, | |
891 | seg_name, &seg_ofs); | |
602adf40 YS |
892 | |
893 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
894 | ||
895 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
896 | if (ret < 0) | |
897 | goto done; | |
898 | ||
899 | /* we've taken care of segment sizes earlier when we | |
900 | cloned the bios. We should never have a segment | |
901 | truncated at this point */ | |
902 | BUG_ON(seg_len < len); | |
903 | ||
904 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
905 | seg_name, seg_ofs, seg_len, | |
906 | bio, | |
907 | NULL, 0, | |
908 | flags, | |
909 | ops, | |
910 | num_reply, | |
911 | rbd_req_cb); | |
912 | done: | |
913 | kfree(seg_name); | |
914 | return ret; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Request async osd write | |
919 | */ | |
920 | static int rbd_req_write(struct request *rq, | |
921 | struct rbd_device *rbd_dev, | |
922 | struct ceph_snap_context *snapc, | |
923 | u64 ofs, u64 len, | |
924 | struct bio *bio) | |
925 | { | |
926 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
927 | CEPH_OSD_OP_WRITE, | |
928 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
929 | 2, | |
930 | ofs, len, bio); | |
931 | } | |
932 | ||
933 | /* | |
934 | * Request async osd read | |
935 | */ | |
936 | static int rbd_req_read(struct request *rq, | |
937 | struct rbd_device *rbd_dev, | |
938 | u64 snapid, | |
939 | u64 ofs, u64 len, | |
940 | struct bio *bio) | |
941 | { | |
942 | return rbd_do_op(rq, rbd_dev, NULL, | |
943 | (snapid ? snapid : CEPH_NOSNAP), | |
944 | CEPH_OSD_OP_READ, | |
945 | CEPH_OSD_FLAG_READ, | |
946 | 2, | |
947 | ofs, len, bio); | |
948 | } | |
949 | ||
950 | /* | |
951 | * Request sync osd read | |
952 | */ | |
953 | static int rbd_req_sync_read(struct rbd_device *dev, | |
954 | struct ceph_snap_context *snapc, | |
955 | u64 snapid, | |
956 | const char *obj, | |
957 | u64 ofs, u64 len, | |
958 | char *buf) | |
959 | { | |
960 | return rbd_req_sync_op(dev, NULL, | |
961 | (snapid ? snapid : CEPH_NOSNAP), | |
962 | CEPH_OSD_OP_READ, | |
963 | CEPH_OSD_FLAG_READ, | |
964 | NULL, | |
965 | 1, obj, ofs, len, buf); | |
966 | } | |
967 | ||
968 | /* | |
969 | * Request sync osd read | |
970 | */ | |
971 | static int rbd_req_sync_rollback_obj(struct rbd_device *dev, | |
972 | u64 snapid, | |
973 | const char *obj) | |
974 | { | |
975 | struct ceph_osd_req_op *ops; | |
976 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_ROLLBACK, 0); | |
977 | if (ret < 0) | |
978 | return ret; | |
979 | ||
980 | ops[0].snap.snapid = snapid; | |
981 | ||
982 | ret = rbd_req_sync_op(dev, NULL, | |
983 | CEPH_NOSNAP, | |
984 | 0, | |
985 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
986 | ops, | |
987 | 1, obj, 0, 0, NULL); | |
988 | ||
989 | rbd_destroy_ops(ops); | |
990 | ||
991 | if (ret < 0) | |
992 | return ret; | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Request sync osd read | |
999 | */ | |
1000 | static int rbd_req_sync_exec(struct rbd_device *dev, | |
1001 | const char *obj, | |
1002 | const char *cls, | |
1003 | const char *method, | |
1004 | const char *data, | |
1005 | int len) | |
1006 | { | |
1007 | struct ceph_osd_req_op *ops; | |
1008 | int cls_len = strlen(cls); | |
1009 | int method_len = strlen(method); | |
1010 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
1011 | cls_len + method_len + len); | |
1012 | if (ret < 0) | |
1013 | return ret; | |
1014 | ||
1015 | ops[0].cls.class_name = cls; | |
1016 | ops[0].cls.class_len = (__u8)cls_len; | |
1017 | ops[0].cls.method_name = method; | |
1018 | ops[0].cls.method_len = (__u8)method_len; | |
1019 | ops[0].cls.argc = 0; | |
1020 | ops[0].cls.indata = data; | |
1021 | ops[0].cls.indata_len = len; | |
1022 | ||
1023 | ret = rbd_req_sync_op(dev, NULL, | |
1024 | CEPH_NOSNAP, | |
1025 | 0, | |
1026 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1027 | ops, | |
1028 | 1, obj, 0, 0, NULL); | |
1029 | ||
1030 | rbd_destroy_ops(ops); | |
1031 | ||
1032 | dout("cls_exec returned %d\n", ret); | |
1033 | return ret; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * block device queue callback | |
1038 | */ | |
1039 | static void rbd_rq_fn(struct request_queue *q) | |
1040 | { | |
1041 | struct rbd_device *rbd_dev = q->queuedata; | |
1042 | struct request *rq; | |
1043 | struct bio_pair *bp = NULL; | |
1044 | ||
1045 | rq = blk_fetch_request(q); | |
1046 | ||
1047 | while (1) { | |
1048 | struct bio *bio; | |
1049 | struct bio *rq_bio, *next_bio = NULL; | |
1050 | bool do_write; | |
1051 | int size, op_size = 0; | |
1052 | u64 ofs; | |
1053 | ||
1054 | /* peek at request from block layer */ | |
1055 | if (!rq) | |
1056 | break; | |
1057 | ||
1058 | dout("fetched request\n"); | |
1059 | ||
1060 | /* filter out block requests we don't understand */ | |
1061 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1062 | __blk_end_request_all(rq, 0); | |
1063 | goto next; | |
1064 | } | |
1065 | ||
1066 | /* deduce our operation (read, write) */ | |
1067 | do_write = (rq_data_dir(rq) == WRITE); | |
1068 | ||
1069 | size = blk_rq_bytes(rq); | |
1070 | ofs = blk_rq_pos(rq) * 512ULL; | |
1071 | rq_bio = rq->bio; | |
1072 | if (do_write && rbd_dev->read_only) { | |
1073 | __blk_end_request_all(rq, -EROFS); | |
1074 | goto next; | |
1075 | } | |
1076 | ||
1077 | spin_unlock_irq(q->queue_lock); | |
1078 | ||
1079 | dout("%s 0x%x bytes at 0x%llx\n", | |
1080 | do_write ? "write" : "read", | |
1081 | size, blk_rq_pos(rq) * 512ULL); | |
1082 | ||
1083 | do { | |
1084 | /* a bio clone to be passed down to OSD req */ | |
1085 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1086 | op_size = rbd_get_segment(&rbd_dev->header, | |
1087 | rbd_dev->header.block_name, | |
1088 | ofs, size, | |
1089 | NULL, NULL); | |
1090 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, | |
1091 | op_size, GFP_ATOMIC); | |
1092 | if (!bio) { | |
1093 | spin_lock_irq(q->queue_lock); | |
1094 | __blk_end_request_all(rq, -ENOMEM); | |
1095 | goto next; | |
1096 | } | |
1097 | ||
1098 | /* init OSD command: write or read */ | |
1099 | if (do_write) | |
1100 | rbd_req_write(rq, rbd_dev, | |
1101 | rbd_dev->header.snapc, | |
1102 | ofs, | |
1103 | op_size, bio); | |
1104 | else | |
1105 | rbd_req_read(rq, rbd_dev, | |
1106 | cur_snap_id(rbd_dev), | |
1107 | ofs, | |
1108 | op_size, bio); | |
1109 | ||
1110 | size -= op_size; | |
1111 | ofs += op_size; | |
1112 | ||
1113 | rq_bio = next_bio; | |
1114 | } while (size > 0); | |
1115 | ||
1116 | if (bp) | |
1117 | bio_pair_release(bp); | |
1118 | ||
1119 | spin_lock_irq(q->queue_lock); | |
1120 | next: | |
1121 | rq = blk_fetch_request(q); | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1127 | * multiple osd objects. One exception would be with a single page bios, | |
1128 | * which we handle later at bio_chain_clone | |
1129 | */ | |
1130 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1131 | struct bio_vec *bvec) | |
1132 | { | |
1133 | struct rbd_device *rbd_dev = q->queuedata; | |
1134 | unsigned int chunk_sectors = 1 << (rbd_dev->header.obj_order - 9); | |
1135 | sector_t sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1136 | unsigned int bio_sectors = bmd->bi_size >> 9; | |
1137 | int max; | |
1138 | ||
1139 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) | |
1140 | + bio_sectors)) << 9; | |
1141 | if (max < 0) | |
1142 | max = 0; /* bio_add cannot handle a negative return */ | |
1143 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1144 | return bvec->bv_len; | |
1145 | return max; | |
1146 | } | |
1147 | ||
1148 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1149 | { | |
1150 | struct gendisk *disk = rbd_dev->disk; | |
1151 | ||
1152 | if (!disk) | |
1153 | return; | |
1154 | ||
1155 | rbd_header_free(&rbd_dev->header); | |
1156 | ||
1157 | if (disk->flags & GENHD_FL_UP) | |
1158 | del_gendisk(disk); | |
1159 | if (disk->queue) | |
1160 | blk_cleanup_queue(disk->queue); | |
1161 | put_disk(disk); | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * reload the ondisk the header | |
1166 | */ | |
1167 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1168 | struct rbd_image_header *header) | |
1169 | { | |
1170 | ssize_t rc; | |
1171 | struct rbd_image_header_ondisk *dh; | |
1172 | int snap_count = 0; | |
1173 | u64 snap_names_len = 0; | |
1174 | ||
1175 | while (1) { | |
1176 | int len = sizeof(*dh) + | |
1177 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1178 | snap_names_len; | |
1179 | ||
1180 | rc = -ENOMEM; | |
1181 | dh = kmalloc(len, GFP_KERNEL); | |
1182 | if (!dh) | |
1183 | return -ENOMEM; | |
1184 | ||
1185 | rc = rbd_req_sync_read(rbd_dev, | |
1186 | NULL, CEPH_NOSNAP, | |
1187 | rbd_dev->obj_md_name, | |
1188 | 0, len, | |
1189 | (char *)dh); | |
1190 | if (rc < 0) | |
1191 | goto out_dh; | |
1192 | ||
1193 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
1194 | if (rc < 0) | |
1195 | goto out_dh; | |
1196 | ||
1197 | if (snap_count != header->total_snaps) { | |
1198 | snap_count = header->total_snaps; | |
1199 | snap_names_len = header->snap_names_len; | |
1200 | rbd_header_free(header); | |
1201 | kfree(dh); | |
1202 | continue; | |
1203 | } | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | out_dh: | |
1208 | kfree(dh); | |
1209 | return rc; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * create a snapshot | |
1214 | */ | |
1215 | static int rbd_header_add_snap(struct rbd_device *dev, | |
1216 | const char *snap_name, | |
1217 | gfp_t gfp_flags) | |
1218 | { | |
1219 | int name_len = strlen(snap_name); | |
1220 | u64 new_snapid; | |
1221 | int ret; | |
1222 | void *data, *data_start, *data_end; | |
1223 | ||
1224 | /* we should create a snapshot only if we're pointing at the head */ | |
1225 | if (dev->cur_snap) | |
1226 | return -EINVAL; | |
1227 | ||
1228 | ret = ceph_monc_create_snapid(&dev->client->monc, dev->poolid, | |
1229 | &new_snapid); | |
1230 | dout("created snapid=%lld\n", new_snapid); | |
1231 | if (ret < 0) | |
1232 | return ret; | |
1233 | ||
1234 | data = kmalloc(name_len + 16, gfp_flags); | |
1235 | if (!data) | |
1236 | return -ENOMEM; | |
1237 | ||
1238 | data_start = data; | |
1239 | data_end = data + name_len + 16; | |
1240 | ||
1241 | ceph_encode_string_safe(&data, data_end, snap_name, name_len, bad); | |
1242 | ceph_encode_64_safe(&data, data_end, new_snapid, bad); | |
1243 | ||
1244 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", | |
1245 | data_start, data - data_start); | |
1246 | ||
1247 | kfree(data_start); | |
1248 | ||
1249 | if (ret < 0) | |
1250 | return ret; | |
1251 | ||
1252 | dev->header.snapc->seq = new_snapid; | |
1253 | ||
1254 | return 0; | |
1255 | bad: | |
1256 | return -ERANGE; | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * only read the first part of the ondisk header, without the snaps info | |
1261 | */ | |
1262 | static int rbd_update_snaps(struct rbd_device *rbd_dev) | |
1263 | { | |
1264 | int ret; | |
1265 | struct rbd_image_header h; | |
1266 | u64 snap_seq; | |
1267 | ||
1268 | ret = rbd_read_header(rbd_dev, &h); | |
1269 | if (ret < 0) | |
1270 | return ret; | |
1271 | ||
1272 | down_write(&rbd_dev->header.snap_rwsem); | |
1273 | ||
1274 | snap_seq = rbd_dev->header.snapc->seq; | |
1275 | ||
1276 | kfree(rbd_dev->header.snapc); | |
1277 | kfree(rbd_dev->header.snap_names); | |
1278 | kfree(rbd_dev->header.snap_sizes); | |
1279 | ||
1280 | rbd_dev->header.total_snaps = h.total_snaps; | |
1281 | rbd_dev->header.snapc = h.snapc; | |
1282 | rbd_dev->header.snap_names = h.snap_names; | |
1283 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
1284 | rbd_dev->header.snapc->seq = snap_seq; | |
1285 | ||
1286 | up_write(&rbd_dev->header.snap_rwsem); | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1292 | { | |
1293 | struct gendisk *disk; | |
1294 | struct request_queue *q; | |
1295 | int rc; | |
1296 | u64 total_size = 0; | |
1297 | ||
1298 | /* contact OSD, request size info about the object being mapped */ | |
1299 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1300 | if (rc) | |
1301 | return rc; | |
1302 | ||
1303 | rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); | |
1304 | if (rc) | |
1305 | return rc; | |
1306 | ||
1307 | /* create gendisk info */ | |
1308 | rc = -ENOMEM; | |
1309 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1310 | if (!disk) | |
1311 | goto out; | |
1312 | ||
1313 | sprintf(disk->disk_name, DRV_NAME "%d", rbd_dev->id); | |
1314 | disk->major = rbd_dev->major; | |
1315 | disk->first_minor = 0; | |
1316 | disk->fops = &rbd_bd_ops; | |
1317 | disk->private_data = rbd_dev; | |
1318 | ||
1319 | /* init rq */ | |
1320 | rc = -ENOMEM; | |
1321 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1322 | if (!q) | |
1323 | goto out_disk; | |
1324 | blk_queue_merge_bvec(q, rbd_merge_bvec); | |
1325 | disk->queue = q; | |
1326 | ||
1327 | q->queuedata = rbd_dev; | |
1328 | ||
1329 | rbd_dev->disk = disk; | |
1330 | rbd_dev->q = q; | |
1331 | ||
1332 | /* finally, announce the disk to the world */ | |
1333 | set_capacity(disk, total_size / 512ULL); | |
1334 | add_disk(disk); | |
1335 | ||
1336 | pr_info("%s: added with size 0x%llx\n", | |
1337 | disk->disk_name, (unsigned long long)total_size); | |
1338 | return 0; | |
1339 | ||
1340 | out_disk: | |
1341 | put_disk(disk); | |
1342 | out: | |
1343 | return rc; | |
1344 | } | |
1345 | ||
1346 | /******************************************************************** | |
1347 | * /sys/class/rbd/ | |
1348 | * add map rados objects to blkdev | |
1349 | * remove unmap rados objects | |
1350 | * list show mappings | |
1351 | *******************************************************************/ | |
1352 | ||
1353 | static void class_rbd_release(struct class *cls) | |
1354 | { | |
1355 | kfree(cls); | |
1356 | } | |
1357 | ||
1358 | static ssize_t class_rbd_list(struct class *c, | |
1359 | struct class_attribute *attr, | |
1360 | char *data) | |
1361 | { | |
1362 | int n = 0; | |
1363 | struct list_head *tmp; | |
1364 | int max = PAGE_SIZE; | |
1365 | ||
1366 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1367 | ||
1368 | n += snprintf(data, max, | |
1369 | "#id\tmajor\tclient_name\tpool\tname\tsnap\tKB\n"); | |
1370 | ||
1371 | list_for_each(tmp, &rbd_dev_list) { | |
1372 | struct rbd_device *rbd_dev; | |
1373 | ||
1374 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1375 | n += snprintf(data+n, max-n, | |
1376 | "%d\t%d\tclient%lld\t%s\t%s\t%s\t%lld\n", | |
1377 | rbd_dev->id, | |
1378 | rbd_dev->major, | |
1379 | ceph_client_id(rbd_dev->client), | |
1380 | rbd_dev->pool_name, | |
1381 | rbd_dev->obj, rbd_dev->snap_name, | |
1382 | rbd_dev->header.image_size >> 10); | |
1383 | if (n == max) | |
1384 | break; | |
1385 | } | |
1386 | ||
1387 | mutex_unlock(&ctl_mutex); | |
1388 | return n; | |
1389 | } | |
1390 | ||
1391 | static ssize_t class_rbd_add(struct class *c, | |
1392 | struct class_attribute *attr, | |
1393 | const char *buf, size_t count) | |
1394 | { | |
1395 | struct ceph_osd_client *osdc; | |
1396 | struct rbd_device *rbd_dev; | |
1397 | ssize_t rc = -ENOMEM; | |
1398 | int irc, new_id = 0; | |
1399 | struct list_head *tmp; | |
1400 | char *mon_dev_name; | |
1401 | char *options; | |
1402 | ||
1403 | if (!try_module_get(THIS_MODULE)) | |
1404 | return -ENODEV; | |
1405 | ||
1406 | mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
1407 | if (!mon_dev_name) | |
1408 | goto err_out_mod; | |
1409 | ||
1410 | options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
1411 | if (!options) | |
1412 | goto err_mon_dev; | |
1413 | ||
1414 | /* new rbd_device object */ | |
1415 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); | |
1416 | if (!rbd_dev) | |
1417 | goto err_out_opt; | |
1418 | ||
1419 | /* static rbd_device initialization */ | |
1420 | spin_lock_init(&rbd_dev->lock); | |
1421 | INIT_LIST_HEAD(&rbd_dev->node); | |
1422 | ||
1423 | /* generate unique id: find highest unique id, add one */ | |
1424 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1425 | ||
1426 | list_for_each(tmp, &rbd_dev_list) { | |
1427 | struct rbd_device *rbd_dev; | |
1428 | ||
1429 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1430 | if (rbd_dev->id >= new_id) | |
1431 | new_id = rbd_dev->id + 1; | |
1432 | } | |
1433 | ||
1434 | rbd_dev->id = new_id; | |
1435 | ||
1436 | /* add to global list */ | |
1437 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
1438 | ||
1439 | /* parse add command */ | |
1440 | if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
1441 | "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
1442 | "%" __stringify(RBD_MAX_POOL_NAME_LEN) "s " | |
1443 | "%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s" | |
1444 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
1445 | mon_dev_name, options, rbd_dev->pool_name, | |
1446 | rbd_dev->obj, rbd_dev->snap_name) < 4) { | |
1447 | rc = -EINVAL; | |
1448 | goto err_out_slot; | |
1449 | } | |
1450 | ||
1451 | if (rbd_dev->snap_name[0] == 0) | |
1452 | rbd_dev->snap_name[0] = '-'; | |
1453 | ||
1454 | rbd_dev->obj_len = strlen(rbd_dev->obj); | |
1455 | snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s", | |
1456 | rbd_dev->obj, RBD_SUFFIX); | |
1457 | ||
1458 | /* initialize rest of new object */ | |
1459 | snprintf(rbd_dev->name, DEV_NAME_LEN, DRV_NAME "%d", rbd_dev->id); | |
1460 | rc = rbd_get_client(rbd_dev, mon_dev_name, options); | |
1461 | if (rc < 0) | |
1462 | goto err_out_slot; | |
1463 | ||
1464 | mutex_unlock(&ctl_mutex); | |
1465 | ||
1466 | /* pick the pool */ | |
1467 | osdc = &rbd_dev->client->osdc; | |
1468 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); | |
1469 | if (rc < 0) | |
1470 | goto err_out_client; | |
1471 | rbd_dev->poolid = rc; | |
1472 | ||
1473 | /* register our block device */ | |
1474 | irc = register_blkdev(0, rbd_dev->name); | |
1475 | if (irc < 0) { | |
1476 | rc = irc; | |
1477 | goto err_out_client; | |
1478 | } | |
1479 | rbd_dev->major = irc; | |
1480 | ||
1481 | /* set up and announce blkdev mapping */ | |
1482 | rc = rbd_init_disk(rbd_dev); | |
1483 | if (rc) | |
1484 | goto err_out_blkdev; | |
1485 | ||
1486 | return count; | |
1487 | ||
1488 | err_out_blkdev: | |
1489 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
1490 | err_out_client: | |
1491 | rbd_put_client(rbd_dev); | |
1492 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1493 | err_out_slot: | |
1494 | list_del_init(&rbd_dev->node); | |
1495 | mutex_unlock(&ctl_mutex); | |
1496 | ||
1497 | kfree(rbd_dev); | |
1498 | err_out_opt: | |
1499 | kfree(options); | |
1500 | err_mon_dev: | |
1501 | kfree(mon_dev_name); | |
1502 | err_out_mod: | |
1503 | dout("Error adding device %s\n", buf); | |
1504 | module_put(THIS_MODULE); | |
1505 | return rc; | |
1506 | } | |
1507 | ||
1508 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
1509 | { | |
1510 | struct list_head *tmp; | |
1511 | struct rbd_device *rbd_dev; | |
1512 | ||
1513 | list_for_each(tmp, &rbd_dev_list) { | |
1514 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1515 | if (rbd_dev->id == id) | |
1516 | return rbd_dev; | |
1517 | } | |
1518 | return NULL; | |
1519 | } | |
1520 | ||
1521 | static ssize_t class_rbd_remove(struct class *c, | |
1522 | struct class_attribute *attr, | |
1523 | const char *buf, | |
1524 | size_t count) | |
1525 | { | |
1526 | struct rbd_device *rbd_dev = NULL; | |
1527 | int target_id, rc; | |
1528 | unsigned long ul; | |
1529 | ||
1530 | rc = strict_strtoul(buf, 10, &ul); | |
1531 | if (rc) | |
1532 | return rc; | |
1533 | ||
1534 | /* convert to int; abort if we lost anything in the conversion */ | |
1535 | target_id = (int) ul; | |
1536 | if (target_id != ul) | |
1537 | return -EINVAL; | |
1538 | ||
1539 | /* remove object from list immediately */ | |
1540 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1541 | ||
1542 | rbd_dev = __rbd_get_dev(target_id); | |
1543 | if (rbd_dev) | |
1544 | list_del_init(&rbd_dev->node); | |
1545 | ||
1546 | mutex_unlock(&ctl_mutex); | |
1547 | ||
1548 | if (!rbd_dev) | |
1549 | return -ENOENT; | |
1550 | ||
1551 | rbd_put_client(rbd_dev); | |
1552 | ||
1553 | /* clean up and free blkdev */ | |
1554 | rbd_free_disk(rbd_dev); | |
1555 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
1556 | kfree(rbd_dev); | |
1557 | ||
1558 | /* release module ref */ | |
1559 | module_put(THIS_MODULE); | |
1560 | ||
1561 | return count; | |
1562 | } | |
1563 | ||
1564 | static ssize_t class_rbd_snaps_list(struct class *c, | |
1565 | struct class_attribute *attr, | |
1566 | char *data) | |
1567 | { | |
1568 | struct rbd_device *rbd_dev = NULL; | |
1569 | struct list_head *tmp; | |
1570 | struct rbd_image_header *header; | |
1571 | int i, n = 0, max = PAGE_SIZE; | |
1572 | int ret; | |
1573 | ||
1574 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1575 | ||
1576 | n += snprintf(data, max, "#id\tsnap\tKB\n"); | |
1577 | ||
1578 | list_for_each(tmp, &rbd_dev_list) { | |
1579 | char *names, *p; | |
1580 | struct ceph_snap_context *snapc; | |
1581 | ||
1582 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
1583 | header = &rbd_dev->header; | |
1584 | ||
1585 | down_read(&header->snap_rwsem); | |
1586 | ||
1587 | names = header->snap_names; | |
1588 | snapc = header->snapc; | |
1589 | ||
1590 | n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n", | |
1591 | rbd_dev->id, RBD_SNAP_HEAD_NAME, | |
1592 | header->image_size >> 10, | |
1593 | (!rbd_dev->cur_snap ? " (*)" : "")); | |
1594 | if (n == max) | |
1595 | break; | |
1596 | ||
1597 | p = names; | |
1598 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { | |
1599 | n += snprintf(data + n, max - n, "%d\t%s\t%lld%s\n", | |
1600 | rbd_dev->id, p, header->snap_sizes[i] >> 10, | |
1601 | (rbd_dev->cur_snap && | |
1602 | (snap_index(header, i) == rbd_dev->cur_snap) ? | |
1603 | " (*)" : "")); | |
1604 | if (n == max) | |
1605 | break; | |
1606 | } | |
1607 | ||
1608 | up_read(&header->snap_rwsem); | |
1609 | } | |
1610 | ||
1611 | ||
1612 | ret = n; | |
1613 | mutex_unlock(&ctl_mutex); | |
1614 | return ret; | |
1615 | } | |
1616 | ||
1617 | static ssize_t class_rbd_snaps_refresh(struct class *c, | |
1618 | struct class_attribute *attr, | |
1619 | const char *buf, | |
1620 | size_t count) | |
1621 | { | |
1622 | struct rbd_device *rbd_dev = NULL; | |
1623 | int target_id, rc; | |
1624 | unsigned long ul; | |
1625 | int ret = count; | |
1626 | ||
1627 | rc = strict_strtoul(buf, 10, &ul); | |
1628 | if (rc) | |
1629 | return rc; | |
1630 | ||
1631 | /* convert to int; abort if we lost anything in the conversion */ | |
1632 | target_id = (int) ul; | |
1633 | if (target_id != ul) | |
1634 | return -EINVAL; | |
1635 | ||
1636 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1637 | ||
1638 | rbd_dev = __rbd_get_dev(target_id); | |
1639 | if (!rbd_dev) { | |
1640 | ret = -ENOENT; | |
1641 | goto done; | |
1642 | } | |
1643 | ||
1644 | rc = rbd_update_snaps(rbd_dev); | |
1645 | if (rc < 0) | |
1646 | ret = rc; | |
1647 | ||
1648 | done: | |
1649 | mutex_unlock(&ctl_mutex); | |
1650 | return ret; | |
1651 | } | |
1652 | ||
1653 | static ssize_t class_rbd_snap_create(struct class *c, | |
1654 | struct class_attribute *attr, | |
1655 | const char *buf, | |
1656 | size_t count) | |
1657 | { | |
1658 | struct rbd_device *rbd_dev = NULL; | |
1659 | int target_id, ret; | |
1660 | char *name; | |
1661 | ||
1662 | name = kmalloc(RBD_MAX_SNAP_NAME_LEN + 1, GFP_KERNEL); | |
1663 | if (!name) | |
1664 | return -ENOMEM; | |
1665 | ||
1666 | /* parse snaps add command */ | |
1667 | if (sscanf(buf, "%d " | |
1668 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
1669 | &target_id, | |
1670 | name) != 2) { | |
1671 | ret = -EINVAL; | |
1672 | goto done; | |
1673 | } | |
1674 | ||
1675 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1676 | ||
1677 | rbd_dev = __rbd_get_dev(target_id); | |
1678 | if (!rbd_dev) { | |
1679 | ret = -ENOENT; | |
1680 | goto done_unlock; | |
1681 | } | |
1682 | ||
1683 | ret = rbd_header_add_snap(rbd_dev, | |
1684 | name, GFP_KERNEL); | |
1685 | if (ret < 0) | |
1686 | goto done_unlock; | |
1687 | ||
1688 | ret = rbd_update_snaps(rbd_dev); | |
1689 | if (ret < 0) | |
1690 | goto done_unlock; | |
1691 | ||
1692 | ret = count; | |
1693 | done_unlock: | |
1694 | mutex_unlock(&ctl_mutex); | |
1695 | done: | |
1696 | kfree(name); | |
1697 | return ret; | |
1698 | } | |
1699 | ||
1700 | static ssize_t class_rbd_rollback(struct class *c, | |
1701 | struct class_attribute *attr, | |
1702 | const char *buf, | |
1703 | size_t count) | |
1704 | { | |
1705 | struct rbd_device *rbd_dev = NULL; | |
1706 | int target_id, ret; | |
1707 | u64 snapid; | |
1708 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; | |
1709 | u64 cur_ofs; | |
1710 | char *seg_name; | |
1711 | ||
1712 | /* parse snaps add command */ | |
1713 | if (sscanf(buf, "%d " | |
1714 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
1715 | &target_id, | |
1716 | snap_name) != 2) { | |
1717 | return -EINVAL; | |
1718 | } | |
1719 | ||
1720 | ret = -ENOMEM; | |
1721 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1722 | if (!seg_name) | |
1723 | return ret; | |
1724 | ||
1725 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1726 | ||
1727 | rbd_dev = __rbd_get_dev(target_id); | |
1728 | if (!rbd_dev) { | |
1729 | ret = -ENOENT; | |
1730 | goto done_unlock; | |
1731 | } | |
1732 | ||
1733 | ret = snap_by_name(&rbd_dev->header, snap_name, &snapid, NULL); | |
1734 | if (ret < 0) | |
1735 | goto done_unlock; | |
1736 | ||
1737 | dout("snapid=%lld\n", snapid); | |
1738 | ||
1739 | cur_ofs = 0; | |
1740 | while (cur_ofs < rbd_dev->header.image_size) { | |
1741 | cur_ofs += rbd_get_segment(&rbd_dev->header, | |
1742 | rbd_dev->obj, | |
1743 | cur_ofs, (u64)-1, | |
1744 | seg_name, NULL); | |
1745 | dout("seg_name=%s\n", seg_name); | |
1746 | ||
1747 | ret = rbd_req_sync_rollback_obj(rbd_dev, snapid, seg_name); | |
1748 | if (ret < 0) | |
1749 | pr_warning("could not roll back obj %s err=%d\n", | |
1750 | seg_name, ret); | |
1751 | } | |
1752 | ||
1753 | ret = rbd_update_snaps(rbd_dev); | |
1754 | if (ret < 0) | |
1755 | goto done_unlock; | |
1756 | ||
1757 | ret = count; | |
1758 | ||
1759 | done_unlock: | |
1760 | mutex_unlock(&ctl_mutex); | |
1761 | kfree(seg_name); | |
1762 | ||
1763 | return ret; | |
1764 | } | |
1765 | ||
1766 | static struct class_attribute class_rbd_attrs[] = { | |
1767 | __ATTR(add, 0200, NULL, class_rbd_add), | |
1768 | __ATTR(remove, 0200, NULL, class_rbd_remove), | |
1769 | __ATTR(list, 0444, class_rbd_list, NULL), | |
1770 | __ATTR(snaps_refresh, 0200, NULL, class_rbd_snaps_refresh), | |
1771 | __ATTR(snap_create, 0200, NULL, class_rbd_snap_create), | |
1772 | __ATTR(snaps_list, 0444, class_rbd_snaps_list, NULL), | |
1773 | __ATTR(snap_rollback, 0200, NULL, class_rbd_rollback), | |
1774 | __ATTR_NULL | |
1775 | }; | |
1776 | ||
1777 | /* | |
1778 | * create control files in sysfs | |
1779 | * /sys/class/rbd/... | |
1780 | */ | |
1781 | static int rbd_sysfs_init(void) | |
1782 | { | |
1783 | int ret = -ENOMEM; | |
1784 | ||
1785 | class_rbd = kzalloc(sizeof(*class_rbd), GFP_KERNEL); | |
1786 | if (!class_rbd) | |
1787 | goto out; | |
1788 | ||
1789 | class_rbd->name = DRV_NAME; | |
1790 | class_rbd->owner = THIS_MODULE; | |
1791 | class_rbd->class_release = class_rbd_release; | |
1792 | class_rbd->class_attrs = class_rbd_attrs; | |
1793 | ||
1794 | ret = class_register(class_rbd); | |
1795 | if (ret) | |
1796 | goto out_class; | |
1797 | return 0; | |
1798 | ||
1799 | out_class: | |
1800 | kfree(class_rbd); | |
1801 | class_rbd = NULL; | |
1802 | pr_err(DRV_NAME ": failed to create class rbd\n"); | |
1803 | out: | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1807 | static void rbd_sysfs_cleanup(void) | |
1808 | { | |
1809 | if (class_rbd) | |
1810 | class_destroy(class_rbd); | |
1811 | class_rbd = NULL; | |
1812 | } | |
1813 | ||
1814 | int __init rbd_init(void) | |
1815 | { | |
1816 | int rc; | |
1817 | ||
1818 | rc = rbd_sysfs_init(); | |
1819 | if (rc) | |
1820 | return rc; | |
1821 | spin_lock_init(&node_lock); | |
1822 | pr_info("loaded " DRV_NAME_LONG "\n"); | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | void __exit rbd_exit(void) | |
1827 | { | |
1828 | rbd_sysfs_cleanup(); | |
1829 | } | |
1830 | ||
1831 | module_init(rbd_init); | |
1832 | module_exit(rbd_exit); | |
1833 | ||
1834 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
1835 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
1836 | MODULE_DESCRIPTION("rados block device"); | |
1837 | ||
1838 | /* following authorship retained from original osdblk.c */ | |
1839 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
1840 | ||
1841 | MODULE_LICENSE("GPL"); |