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Commit | Line | Data |
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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 | For usage instructions, please refer to: | |
25 | ||
26 | Documentation/ABI/testing/sysfs-bus-rbd | |
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 | #include <linux/parser.h> | |
35 | ||
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
44 | /* | |
45 | * The basic unit of block I/O is a sector. It is interpreted in a | |
46 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
47 | * universally 512 bytes. These symbols are just slightly more | |
48 | * meaningful than the bare numbers they represent. | |
49 | */ | |
50 | #define SECTOR_SHIFT 9 | |
51 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
52 | ||
53 | #define RBD_DRV_NAME "rbd" | |
54 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
55 | ||
56 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
57 | ||
58 | #define RBD_MAX_SNAP_NAME_LEN 32 | |
59 | #define RBD_MAX_OPT_LEN 1024 | |
60 | ||
61 | #define RBD_SNAP_HEAD_NAME "-" | |
62 | ||
63 | /* | |
64 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
65 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
66 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
67 | * enough to hold all possible device names. | |
68 | */ | |
69 | #define DEV_NAME_LEN 32 | |
70 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) | |
71 | ||
72 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 | |
73 | ||
74 | /* | |
75 | * block device image metadata (in-memory version) | |
76 | */ | |
77 | struct rbd_image_header { | |
78 | u64 image_size; | |
79 | char *object_prefix; | |
80 | __u8 obj_order; | |
81 | __u8 crypt_type; | |
82 | __u8 comp_type; | |
83 | struct ceph_snap_context *snapc; | |
84 | size_t snap_names_len; | |
85 | u32 total_snaps; | |
86 | ||
87 | char *snap_names; | |
88 | u64 *snap_sizes; | |
89 | ||
90 | u64 obj_version; | |
91 | }; | |
92 | ||
93 | struct rbd_options { | |
94 | int notify_timeout; | |
95 | }; | |
96 | ||
97 | /* | |
98 | * an instance of the client. multiple devices may share an rbd client. | |
99 | */ | |
100 | struct rbd_client { | |
101 | struct ceph_client *client; | |
102 | struct rbd_options *rbd_opts; | |
103 | struct kref kref; | |
104 | struct list_head node; | |
105 | }; | |
106 | ||
107 | /* | |
108 | * a request completion status | |
109 | */ | |
110 | struct rbd_req_status { | |
111 | int done; | |
112 | int rc; | |
113 | u64 bytes; | |
114 | }; | |
115 | ||
116 | /* | |
117 | * a collection of requests | |
118 | */ | |
119 | struct rbd_req_coll { | |
120 | int total; | |
121 | int num_done; | |
122 | struct kref kref; | |
123 | struct rbd_req_status status[0]; | |
124 | }; | |
125 | ||
126 | /* | |
127 | * a single io request | |
128 | */ | |
129 | struct rbd_request { | |
130 | struct request *rq; /* blk layer request */ | |
131 | struct bio *bio; /* cloned bio */ | |
132 | struct page **pages; /* list of used pages */ | |
133 | u64 len; | |
134 | int coll_index; | |
135 | struct rbd_req_coll *coll; | |
136 | }; | |
137 | ||
138 | struct rbd_snap { | |
139 | struct device dev; | |
140 | const char *name; | |
141 | u64 size; | |
142 | struct list_head node; | |
143 | u64 id; | |
144 | }; | |
145 | ||
146 | /* | |
147 | * a single device | |
148 | */ | |
149 | struct rbd_device { | |
150 | int id; /* blkdev unique id */ | |
151 | ||
152 | int major; /* blkdev assigned major */ | |
153 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
154 | struct request_queue *q; | |
155 | ||
156 | struct rbd_client *rbd_client; | |
157 | ||
158 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
159 | ||
160 | spinlock_t lock; /* queue lock */ | |
161 | ||
162 | struct rbd_image_header header; | |
163 | char *image_name; | |
164 | size_t image_name_len; | |
165 | char *header_name; | |
166 | char *pool_name; | |
167 | int pool_id; | |
168 | ||
169 | struct ceph_osd_event *watch_event; | |
170 | struct ceph_osd_request *watch_request; | |
171 | ||
172 | /* protects updating the header */ | |
173 | struct rw_semaphore header_rwsem; | |
174 | /* name of the snapshot this device reads from */ | |
175 | char *snap_name; | |
176 | /* id of the snapshot this device reads from */ | |
177 | u64 snap_id; /* current snapshot id */ | |
178 | /* whether the snap_id this device reads from still exists */ | |
179 | bool snap_exists; | |
180 | int read_only; | |
181 | ||
182 | struct list_head node; | |
183 | ||
184 | /* list of snapshots */ | |
185 | struct list_head snaps; | |
186 | ||
187 | /* sysfs related */ | |
188 | struct device dev; | |
189 | }; | |
190 | ||
191 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ | |
192 | ||
193 | static LIST_HEAD(rbd_dev_list); /* devices */ | |
194 | static DEFINE_SPINLOCK(rbd_dev_list_lock); | |
195 | ||
196 | static LIST_HEAD(rbd_client_list); /* clients */ | |
197 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
198 | ||
199 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); | |
200 | static void rbd_dev_release(struct device *dev); | |
201 | static ssize_t rbd_snap_add(struct device *dev, | |
202 | struct device_attribute *attr, | |
203 | const char *buf, | |
204 | size_t count); | |
205 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
206 | struct rbd_snap *snap); | |
207 | ||
208 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, | |
209 | size_t count); | |
210 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
211 | size_t count); | |
212 | ||
213 | static struct bus_attribute rbd_bus_attrs[] = { | |
214 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
215 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
216 | __ATTR_NULL | |
217 | }; | |
218 | ||
219 | static struct bus_type rbd_bus_type = { | |
220 | .name = "rbd", | |
221 | .bus_attrs = rbd_bus_attrs, | |
222 | }; | |
223 | ||
224 | static void rbd_root_dev_release(struct device *dev) | |
225 | { | |
226 | } | |
227 | ||
228 | static struct device rbd_root_dev = { | |
229 | .init_name = "rbd", | |
230 | .release = rbd_root_dev_release, | |
231 | }; | |
232 | ||
233 | ||
234 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) | |
235 | { | |
236 | return get_device(&rbd_dev->dev); | |
237 | } | |
238 | ||
239 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
240 | { | |
241 | put_device(&rbd_dev->dev); | |
242 | } | |
243 | ||
244 | static int __rbd_refresh_header(struct rbd_device *rbd_dev); | |
245 | ||
246 | static int rbd_open(struct block_device *bdev, fmode_t mode) | |
247 | { | |
248 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
249 | ||
250 | rbd_get_dev(rbd_dev); | |
251 | ||
252 | set_device_ro(bdev, rbd_dev->read_only); | |
253 | ||
254 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
255 | return -EROFS; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static int rbd_release(struct gendisk *disk, fmode_t mode) | |
261 | { | |
262 | struct rbd_device *rbd_dev = disk->private_data; | |
263 | ||
264 | rbd_put_dev(rbd_dev); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static const struct block_device_operations rbd_bd_ops = { | |
270 | .owner = THIS_MODULE, | |
271 | .open = rbd_open, | |
272 | .release = rbd_release, | |
273 | }; | |
274 | ||
275 | /* | |
276 | * Initialize an rbd client instance. | |
277 | * We own *ceph_opts. | |
278 | */ | |
279 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts, | |
280 | struct rbd_options *rbd_opts) | |
281 | { | |
282 | struct rbd_client *rbdc; | |
283 | int ret = -ENOMEM; | |
284 | ||
285 | dout("rbd_client_create\n"); | |
286 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
287 | if (!rbdc) | |
288 | goto out_opt; | |
289 | ||
290 | kref_init(&rbdc->kref); | |
291 | INIT_LIST_HEAD(&rbdc->node); | |
292 | ||
293 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
294 | ||
295 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); | |
296 | if (IS_ERR(rbdc->client)) | |
297 | goto out_mutex; | |
298 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ | |
299 | ||
300 | ret = ceph_open_session(rbdc->client); | |
301 | if (ret < 0) | |
302 | goto out_err; | |
303 | ||
304 | rbdc->rbd_opts = rbd_opts; | |
305 | ||
306 | spin_lock(&rbd_client_list_lock); | |
307 | list_add_tail(&rbdc->node, &rbd_client_list); | |
308 | spin_unlock(&rbd_client_list_lock); | |
309 | ||
310 | mutex_unlock(&ctl_mutex); | |
311 | ||
312 | dout("rbd_client_create created %p\n", rbdc); | |
313 | return rbdc; | |
314 | ||
315 | out_err: | |
316 | ceph_destroy_client(rbdc->client); | |
317 | out_mutex: | |
318 | mutex_unlock(&ctl_mutex); | |
319 | kfree(rbdc); | |
320 | out_opt: | |
321 | if (ceph_opts) | |
322 | ceph_destroy_options(ceph_opts); | |
323 | return ERR_PTR(ret); | |
324 | } | |
325 | ||
326 | /* | |
327 | * Find a ceph client with specific addr and configuration. | |
328 | */ | |
329 | static struct rbd_client *__rbd_client_find(struct ceph_options *ceph_opts) | |
330 | { | |
331 | struct rbd_client *client_node; | |
332 | ||
333 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) | |
334 | return NULL; | |
335 | ||
336 | list_for_each_entry(client_node, &rbd_client_list, node) | |
337 | if (!ceph_compare_options(ceph_opts, client_node->client)) | |
338 | return client_node; | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* | |
343 | * mount options | |
344 | */ | |
345 | enum { | |
346 | Opt_notify_timeout, | |
347 | Opt_last_int, | |
348 | /* int args above */ | |
349 | Opt_last_string, | |
350 | /* string args above */ | |
351 | }; | |
352 | ||
353 | static match_table_t rbd_opts_tokens = { | |
354 | {Opt_notify_timeout, "notify_timeout=%d"}, | |
355 | /* int args above */ | |
356 | /* string args above */ | |
357 | {-1, NULL} | |
358 | }; | |
359 | ||
360 | static int parse_rbd_opts_token(char *c, void *private) | |
361 | { | |
362 | struct rbd_options *rbd_opts = private; | |
363 | substring_t argstr[MAX_OPT_ARGS]; | |
364 | int token, intval, ret; | |
365 | ||
366 | token = match_token(c, rbd_opts_tokens, argstr); | |
367 | if (token < 0) | |
368 | return -EINVAL; | |
369 | ||
370 | if (token < Opt_last_int) { | |
371 | ret = match_int(&argstr[0], &intval); | |
372 | if (ret < 0) { | |
373 | pr_err("bad mount option arg (not int) " | |
374 | "at '%s'\n", c); | |
375 | return ret; | |
376 | } | |
377 | dout("got int token %d val %d\n", token, intval); | |
378 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
379 | dout("got string token %d val %s\n", token, | |
380 | argstr[0].from); | |
381 | } else { | |
382 | dout("got token %d\n", token); | |
383 | } | |
384 | ||
385 | switch (token) { | |
386 | case Opt_notify_timeout: | |
387 | rbd_opts->notify_timeout = intval; | |
388 | break; | |
389 | default: | |
390 | BUG_ON(token); | |
391 | } | |
392 | return 0; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Get a ceph client with specific addr and configuration, if one does | |
397 | * not exist create it. | |
398 | */ | |
399 | static struct rbd_client *rbd_get_client(const char *mon_addr, | |
400 | size_t mon_addr_len, | |
401 | char *options) | |
402 | { | |
403 | struct rbd_client *rbdc; | |
404 | struct ceph_options *ceph_opts; | |
405 | struct rbd_options *rbd_opts; | |
406 | ||
407 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
408 | if (!rbd_opts) | |
409 | return ERR_PTR(-ENOMEM); | |
410 | ||
411 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
412 | ||
413 | ceph_opts = ceph_parse_options(options, mon_addr, | |
414 | mon_addr + mon_addr_len, | |
415 | parse_rbd_opts_token, rbd_opts); | |
416 | if (IS_ERR(ceph_opts)) { | |
417 | kfree(rbd_opts); | |
418 | return ERR_CAST(ceph_opts); | |
419 | } | |
420 | ||
421 | spin_lock(&rbd_client_list_lock); | |
422 | rbdc = __rbd_client_find(ceph_opts); | |
423 | if (rbdc) { | |
424 | /* using an existing client */ | |
425 | kref_get(&rbdc->kref); | |
426 | spin_unlock(&rbd_client_list_lock); | |
427 | ||
428 | ceph_destroy_options(ceph_opts); | |
429 | kfree(rbd_opts); | |
430 | ||
431 | return rbdc; | |
432 | } | |
433 | spin_unlock(&rbd_client_list_lock); | |
434 | ||
435 | rbdc = rbd_client_create(ceph_opts, rbd_opts); | |
436 | ||
437 | if (IS_ERR(rbdc)) | |
438 | kfree(rbd_opts); | |
439 | ||
440 | return rbdc; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Destroy ceph client | |
445 | * | |
446 | * Caller must hold rbd_client_list_lock. | |
447 | */ | |
448 | static void rbd_client_release(struct kref *kref) | |
449 | { | |
450 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
451 | ||
452 | dout("rbd_release_client %p\n", rbdc); | |
453 | spin_lock(&rbd_client_list_lock); | |
454 | list_del(&rbdc->node); | |
455 | spin_unlock(&rbd_client_list_lock); | |
456 | ||
457 | ceph_destroy_client(rbdc->client); | |
458 | kfree(rbdc->rbd_opts); | |
459 | kfree(rbdc); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
464 | * it. | |
465 | */ | |
466 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
467 | { | |
468 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
469 | rbd_dev->rbd_client = NULL; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Destroy requests collection | |
474 | */ | |
475 | static void rbd_coll_release(struct kref *kref) | |
476 | { | |
477 | struct rbd_req_coll *coll = | |
478 | container_of(kref, struct rbd_req_coll, kref); | |
479 | ||
480 | dout("rbd_coll_release %p\n", coll); | |
481 | kfree(coll); | |
482 | } | |
483 | ||
484 | /* | |
485 | * Create a new header structure, translate header format from the on-disk | |
486 | * header. | |
487 | */ | |
488 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
489 | struct rbd_image_header_ondisk *ondisk, | |
490 | u32 allocated_snaps, | |
491 | gfp_t gfp_flags) | |
492 | { | |
493 | u32 i, snap_count; | |
494 | ||
495 | if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) | |
496 | return -ENXIO; | |
497 | ||
498 | snap_count = le32_to_cpu(ondisk->snap_count); | |
499 | if (snap_count > (UINT_MAX - sizeof(struct ceph_snap_context)) | |
500 | / sizeof (*ondisk)) | |
501 | return -EINVAL; | |
502 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + | |
503 | snap_count * sizeof(u64), | |
504 | gfp_flags); | |
505 | if (!header->snapc) | |
506 | return -ENOMEM; | |
507 | ||
508 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); | |
509 | if (snap_count) { | |
510 | header->snap_names = kmalloc(header->snap_names_len, | |
511 | gfp_flags); | |
512 | if (!header->snap_names) | |
513 | goto err_snapc; | |
514 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
515 | gfp_flags); | |
516 | if (!header->snap_sizes) | |
517 | goto err_names; | |
518 | } else { | |
519 | header->snap_names = NULL; | |
520 | header->snap_sizes = NULL; | |
521 | } | |
522 | ||
523 | header->object_prefix = kmalloc(sizeof (ondisk->block_name) + 1, | |
524 | gfp_flags); | |
525 | if (!header->object_prefix) | |
526 | goto err_sizes; | |
527 | ||
528 | memcpy(header->object_prefix, ondisk->block_name, | |
529 | sizeof(ondisk->block_name)); | |
530 | header->object_prefix[sizeof (ondisk->block_name)] = '\0'; | |
531 | ||
532 | header->image_size = le64_to_cpu(ondisk->image_size); | |
533 | header->obj_order = ondisk->options.order; | |
534 | header->crypt_type = ondisk->options.crypt_type; | |
535 | header->comp_type = ondisk->options.comp_type; | |
536 | ||
537 | atomic_set(&header->snapc->nref, 1); | |
538 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
539 | header->snapc->num_snaps = snap_count; | |
540 | header->total_snaps = snap_count; | |
541 | ||
542 | if (snap_count && allocated_snaps == snap_count) { | |
543 | for (i = 0; i < snap_count; i++) { | |
544 | header->snapc->snaps[i] = | |
545 | le64_to_cpu(ondisk->snaps[i].id); | |
546 | header->snap_sizes[i] = | |
547 | le64_to_cpu(ondisk->snaps[i].image_size); | |
548 | } | |
549 | ||
550 | /* copy snapshot names */ | |
551 | memcpy(header->snap_names, &ondisk->snaps[i], | |
552 | header->snap_names_len); | |
553 | } | |
554 | ||
555 | return 0; | |
556 | ||
557 | err_sizes: | |
558 | kfree(header->snap_sizes); | |
559 | err_names: | |
560 | kfree(header->snap_names); | |
561 | err_snapc: | |
562 | kfree(header->snapc); | |
563 | return -ENOMEM; | |
564 | } | |
565 | ||
566 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, | |
567 | u64 *seq, u64 *size) | |
568 | { | |
569 | int i; | |
570 | char *p = header->snap_names; | |
571 | ||
572 | for (i = 0; i < header->total_snaps; i++) { | |
573 | if (!strcmp(snap_name, p)) { | |
574 | ||
575 | /* Found it. Pass back its id and/or size */ | |
576 | ||
577 | if (seq) | |
578 | *seq = header->snapc->snaps[i]; | |
579 | if (size) | |
580 | *size = header->snap_sizes[i]; | |
581 | return i; | |
582 | } | |
583 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
584 | } | |
585 | return -ENOENT; | |
586 | } | |
587 | ||
588 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) | |
589 | { | |
590 | int ret; | |
591 | ||
592 | down_write(&rbd_dev->header_rwsem); | |
593 | ||
594 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, | |
595 | sizeof (RBD_SNAP_HEAD_NAME))) { | |
596 | rbd_dev->snap_id = CEPH_NOSNAP; | |
597 | rbd_dev->snap_exists = false; | |
598 | rbd_dev->read_only = 0; | |
599 | if (size) | |
600 | *size = rbd_dev->header.image_size; | |
601 | } else { | |
602 | u64 snap_id = 0; | |
603 | ||
604 | ret = snap_by_name(&rbd_dev->header, rbd_dev->snap_name, | |
605 | &snap_id, size); | |
606 | if (ret < 0) | |
607 | goto done; | |
608 | rbd_dev->snap_id = snap_id; | |
609 | rbd_dev->snap_exists = true; | |
610 | rbd_dev->read_only = 1; | |
611 | } | |
612 | ||
613 | ret = 0; | |
614 | done: | |
615 | up_write(&rbd_dev->header_rwsem); | |
616 | return ret; | |
617 | } | |
618 | ||
619 | static void rbd_header_free(struct rbd_image_header *header) | |
620 | { | |
621 | kfree(header->object_prefix); | |
622 | kfree(header->snap_sizes); | |
623 | kfree(header->snap_names); | |
624 | ceph_put_snap_context(header->snapc); | |
625 | } | |
626 | ||
627 | /* | |
628 | * get the actual striped segment name, offset and length | |
629 | */ | |
630 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
631 | const char *object_prefix, | |
632 | u64 ofs, u64 len, | |
633 | char *seg_name, u64 *segofs) | |
634 | { | |
635 | u64 seg = ofs >> header->obj_order; | |
636 | ||
637 | if (seg_name) | |
638 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
639 | "%s.%012llx", object_prefix, seg); | |
640 | ||
641 | ofs = ofs & ((1 << header->obj_order) - 1); | |
642 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
643 | ||
644 | if (segofs) | |
645 | *segofs = ofs; | |
646 | ||
647 | return len; | |
648 | } | |
649 | ||
650 | static int rbd_get_num_segments(struct rbd_image_header *header, | |
651 | u64 ofs, u64 len) | |
652 | { | |
653 | u64 start_seg = ofs >> header->obj_order; | |
654 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
655 | return end_seg - start_seg + 1; | |
656 | } | |
657 | ||
658 | /* | |
659 | * returns the size of an object in the image | |
660 | */ | |
661 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
662 | { | |
663 | return 1 << header->obj_order; | |
664 | } | |
665 | ||
666 | /* | |
667 | * bio helpers | |
668 | */ | |
669 | ||
670 | static void bio_chain_put(struct bio *chain) | |
671 | { | |
672 | struct bio *tmp; | |
673 | ||
674 | while (chain) { | |
675 | tmp = chain; | |
676 | chain = chain->bi_next; | |
677 | bio_put(tmp); | |
678 | } | |
679 | } | |
680 | ||
681 | /* | |
682 | * zeros a bio chain, starting at specific offset | |
683 | */ | |
684 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
685 | { | |
686 | struct bio_vec *bv; | |
687 | unsigned long flags; | |
688 | void *buf; | |
689 | int i; | |
690 | int pos = 0; | |
691 | ||
692 | while (chain) { | |
693 | bio_for_each_segment(bv, chain, i) { | |
694 | if (pos + bv->bv_len > start_ofs) { | |
695 | int remainder = max(start_ofs - pos, 0); | |
696 | buf = bvec_kmap_irq(bv, &flags); | |
697 | memset(buf + remainder, 0, | |
698 | bv->bv_len - remainder); | |
699 | bvec_kunmap_irq(buf, &flags); | |
700 | } | |
701 | pos += bv->bv_len; | |
702 | } | |
703 | ||
704 | chain = chain->bi_next; | |
705 | } | |
706 | } | |
707 | ||
708 | /* | |
709 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
710 | * might return a bio_pair that will need to be released. | |
711 | */ | |
712 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
713 | struct bio_pair **bp, | |
714 | int len, gfp_t gfpmask) | |
715 | { | |
716 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
717 | int total = 0; | |
718 | ||
719 | if (*bp) { | |
720 | bio_pair_release(*bp); | |
721 | *bp = NULL; | |
722 | } | |
723 | ||
724 | while (old_chain && (total < len)) { | |
725 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
726 | if (!tmp) | |
727 | goto err_out; | |
728 | ||
729 | if (total + old_chain->bi_size > len) { | |
730 | struct bio_pair *bp; | |
731 | ||
732 | /* | |
733 | * this split can only happen with a single paged bio, | |
734 | * split_bio will BUG_ON if this is not the case | |
735 | */ | |
736 | dout("bio_chain_clone split! total=%d remaining=%d" | |
737 | "bi_size=%d\n", | |
738 | (int)total, (int)len-total, | |
739 | (int)old_chain->bi_size); | |
740 | ||
741 | /* split the bio. We'll release it either in the next | |
742 | call, or it will have to be released outside */ | |
743 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); | |
744 | if (!bp) | |
745 | goto err_out; | |
746 | ||
747 | __bio_clone(tmp, &bp->bio1); | |
748 | ||
749 | *next = &bp->bio2; | |
750 | } else { | |
751 | __bio_clone(tmp, old_chain); | |
752 | *next = old_chain->bi_next; | |
753 | } | |
754 | ||
755 | tmp->bi_bdev = NULL; | |
756 | gfpmask &= ~__GFP_WAIT; | |
757 | tmp->bi_next = NULL; | |
758 | ||
759 | if (!new_chain) { | |
760 | new_chain = tail = tmp; | |
761 | } else { | |
762 | tail->bi_next = tmp; | |
763 | tail = tmp; | |
764 | } | |
765 | old_chain = old_chain->bi_next; | |
766 | ||
767 | total += tmp->bi_size; | |
768 | } | |
769 | ||
770 | BUG_ON(total < len); | |
771 | ||
772 | if (tail) | |
773 | tail->bi_next = NULL; | |
774 | ||
775 | *old = old_chain; | |
776 | ||
777 | return new_chain; | |
778 | ||
779 | err_out: | |
780 | dout("bio_chain_clone with err\n"); | |
781 | bio_chain_put(new_chain); | |
782 | return NULL; | |
783 | } | |
784 | ||
785 | /* | |
786 | * helpers for osd request op vectors. | |
787 | */ | |
788 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
789 | int num_ops, | |
790 | int opcode, | |
791 | u32 payload_len) | |
792 | { | |
793 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
794 | GFP_NOIO); | |
795 | if (!*ops) | |
796 | return -ENOMEM; | |
797 | (*ops)[0].op = opcode; | |
798 | /* | |
799 | * op extent offset and length will be set later on | |
800 | * in calc_raw_layout() | |
801 | */ | |
802 | (*ops)[0].payload_len = payload_len; | |
803 | return 0; | |
804 | } | |
805 | ||
806 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
807 | { | |
808 | kfree(ops); | |
809 | } | |
810 | ||
811 | static void rbd_coll_end_req_index(struct request *rq, | |
812 | struct rbd_req_coll *coll, | |
813 | int index, | |
814 | int ret, u64 len) | |
815 | { | |
816 | struct request_queue *q; | |
817 | int min, max, i; | |
818 | ||
819 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", | |
820 | coll, index, ret, len); | |
821 | ||
822 | if (!rq) | |
823 | return; | |
824 | ||
825 | if (!coll) { | |
826 | blk_end_request(rq, ret, len); | |
827 | return; | |
828 | } | |
829 | ||
830 | q = rq->q; | |
831 | ||
832 | spin_lock_irq(q->queue_lock); | |
833 | coll->status[index].done = 1; | |
834 | coll->status[index].rc = ret; | |
835 | coll->status[index].bytes = len; | |
836 | max = min = coll->num_done; | |
837 | while (max < coll->total && coll->status[max].done) | |
838 | max++; | |
839 | ||
840 | for (i = min; i<max; i++) { | |
841 | __blk_end_request(rq, coll->status[i].rc, | |
842 | coll->status[i].bytes); | |
843 | coll->num_done++; | |
844 | kref_put(&coll->kref, rbd_coll_release); | |
845 | } | |
846 | spin_unlock_irq(q->queue_lock); | |
847 | } | |
848 | ||
849 | static void rbd_coll_end_req(struct rbd_request *req, | |
850 | int ret, u64 len) | |
851 | { | |
852 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Send ceph osd request | |
857 | */ | |
858 | static int rbd_do_request(struct request *rq, | |
859 | struct rbd_device *rbd_dev, | |
860 | struct ceph_snap_context *snapc, | |
861 | u64 snapid, | |
862 | const char *object_name, u64 ofs, u64 len, | |
863 | struct bio *bio, | |
864 | struct page **pages, | |
865 | int num_pages, | |
866 | int flags, | |
867 | struct ceph_osd_req_op *ops, | |
868 | struct rbd_req_coll *coll, | |
869 | int coll_index, | |
870 | void (*rbd_cb)(struct ceph_osd_request *req, | |
871 | struct ceph_msg *msg), | |
872 | struct ceph_osd_request **linger_req, | |
873 | u64 *ver) | |
874 | { | |
875 | struct ceph_osd_request *req; | |
876 | struct ceph_file_layout *layout; | |
877 | int ret; | |
878 | u64 bno; | |
879 | struct timespec mtime = CURRENT_TIME; | |
880 | struct rbd_request *req_data; | |
881 | struct ceph_osd_request_head *reqhead; | |
882 | struct ceph_osd_client *osdc; | |
883 | ||
884 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); | |
885 | if (!req_data) { | |
886 | if (coll) | |
887 | rbd_coll_end_req_index(rq, coll, coll_index, | |
888 | -ENOMEM, len); | |
889 | return -ENOMEM; | |
890 | } | |
891 | ||
892 | if (coll) { | |
893 | req_data->coll = coll; | |
894 | req_data->coll_index = coll_index; | |
895 | } | |
896 | ||
897 | dout("rbd_do_request object_name=%s ofs=%lld len=%lld\n", | |
898 | object_name, len, ofs); | |
899 | ||
900 | osdc = &rbd_dev->rbd_client->client->osdc; | |
901 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, | |
902 | false, GFP_NOIO, pages, bio); | |
903 | if (!req) { | |
904 | ret = -ENOMEM; | |
905 | goto done_pages; | |
906 | } | |
907 | ||
908 | req->r_callback = rbd_cb; | |
909 | ||
910 | req_data->rq = rq; | |
911 | req_data->bio = bio; | |
912 | req_data->pages = pages; | |
913 | req_data->len = len; | |
914 | ||
915 | req->r_priv = req_data; | |
916 | ||
917 | reqhead = req->r_request->front.iov_base; | |
918 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
919 | ||
920 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); | |
921 | req->r_oid_len = strlen(req->r_oid); | |
922 | ||
923 | layout = &req->r_file_layout; | |
924 | memset(layout, 0, sizeof(*layout)); | |
925 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
926 | layout->fl_stripe_count = cpu_to_le32(1); | |
927 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
928 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); | |
929 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, | |
930 | req, ops); | |
931 | ||
932 | ceph_osdc_build_request(req, ofs, &len, | |
933 | ops, | |
934 | snapc, | |
935 | &mtime, | |
936 | req->r_oid, req->r_oid_len); | |
937 | ||
938 | if (linger_req) { | |
939 | ceph_osdc_set_request_linger(osdc, req); | |
940 | *linger_req = req; | |
941 | } | |
942 | ||
943 | ret = ceph_osdc_start_request(osdc, req, false); | |
944 | if (ret < 0) | |
945 | goto done_err; | |
946 | ||
947 | if (!rbd_cb) { | |
948 | ret = ceph_osdc_wait_request(osdc, req); | |
949 | if (ver) | |
950 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
951 | dout("reassert_ver=%lld\n", | |
952 | le64_to_cpu(req->r_reassert_version.version)); | |
953 | ceph_osdc_put_request(req); | |
954 | } | |
955 | return ret; | |
956 | ||
957 | done_err: | |
958 | bio_chain_put(req_data->bio); | |
959 | ceph_osdc_put_request(req); | |
960 | done_pages: | |
961 | rbd_coll_end_req(req_data, ret, len); | |
962 | kfree(req_data); | |
963 | return ret; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Ceph osd op callback | |
968 | */ | |
969 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
970 | { | |
971 | struct rbd_request *req_data = req->r_priv; | |
972 | struct ceph_osd_reply_head *replyhead; | |
973 | struct ceph_osd_op *op; | |
974 | __s32 rc; | |
975 | u64 bytes; | |
976 | int read_op; | |
977 | ||
978 | /* parse reply */ | |
979 | replyhead = msg->front.iov_base; | |
980 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
981 | op = (void *)(replyhead + 1); | |
982 | rc = le32_to_cpu(replyhead->result); | |
983 | bytes = le64_to_cpu(op->extent.length); | |
984 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); | |
985 | ||
986 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
987 | ||
988 | if (rc == -ENOENT && read_op) { | |
989 | zero_bio_chain(req_data->bio, 0); | |
990 | rc = 0; | |
991 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
992 | zero_bio_chain(req_data->bio, bytes); | |
993 | bytes = req_data->len; | |
994 | } | |
995 | ||
996 | rbd_coll_end_req(req_data, rc, bytes); | |
997 | ||
998 | if (req_data->bio) | |
999 | bio_chain_put(req_data->bio); | |
1000 | ||
1001 | ceph_osdc_put_request(req); | |
1002 | kfree(req_data); | |
1003 | } | |
1004 | ||
1005 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1006 | { | |
1007 | ceph_osdc_put_request(req); | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Do a synchronous ceph osd operation | |
1012 | */ | |
1013 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, | |
1014 | struct ceph_snap_context *snapc, | |
1015 | u64 snapid, | |
1016 | int opcode, | |
1017 | int flags, | |
1018 | struct ceph_osd_req_op *orig_ops, | |
1019 | const char *object_name, | |
1020 | u64 ofs, u64 len, | |
1021 | char *buf, | |
1022 | struct ceph_osd_request **linger_req, | |
1023 | u64 *ver) | |
1024 | { | |
1025 | int ret; | |
1026 | struct page **pages; | |
1027 | int num_pages; | |
1028 | struct ceph_osd_req_op *ops = orig_ops; | |
1029 | u32 payload_len; | |
1030 | ||
1031 | num_pages = calc_pages_for(ofs , len); | |
1032 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
1033 | if (IS_ERR(pages)) | |
1034 | return PTR_ERR(pages); | |
1035 | ||
1036 | if (!orig_ops) { | |
1037 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
1038 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1039 | if (ret < 0) | |
1040 | goto done; | |
1041 | ||
1042 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
1043 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
1044 | if (ret < 0) | |
1045 | goto done_ops; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, | |
1050 | object_name, ofs, len, NULL, | |
1051 | pages, num_pages, | |
1052 | flags, | |
1053 | ops, | |
1054 | NULL, 0, | |
1055 | NULL, | |
1056 | linger_req, ver); | |
1057 | if (ret < 0) | |
1058 | goto done_ops; | |
1059 | ||
1060 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1061 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1062 | ||
1063 | done_ops: | |
1064 | if (!orig_ops) | |
1065 | rbd_destroy_ops(ops); | |
1066 | done: | |
1067 | ceph_release_page_vector(pages, num_pages); | |
1068 | return ret; | |
1069 | } | |
1070 | ||
1071 | /* | |
1072 | * Do an asynchronous ceph osd operation | |
1073 | */ | |
1074 | static int rbd_do_op(struct request *rq, | |
1075 | struct rbd_device *rbd_dev, | |
1076 | struct ceph_snap_context *snapc, | |
1077 | u64 snapid, | |
1078 | int opcode, int flags, | |
1079 | u64 ofs, u64 len, | |
1080 | struct bio *bio, | |
1081 | struct rbd_req_coll *coll, | |
1082 | int coll_index) | |
1083 | { | |
1084 | char *seg_name; | |
1085 | u64 seg_ofs; | |
1086 | u64 seg_len; | |
1087 | int ret; | |
1088 | struct ceph_osd_req_op *ops; | |
1089 | u32 payload_len; | |
1090 | ||
1091 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1092 | if (!seg_name) | |
1093 | return -ENOMEM; | |
1094 | ||
1095 | seg_len = rbd_get_segment(&rbd_dev->header, | |
1096 | rbd_dev->header.object_prefix, | |
1097 | ofs, len, | |
1098 | seg_name, &seg_ofs); | |
1099 | ||
1100 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1101 | ||
1102 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1103 | if (ret < 0) | |
1104 | goto done; | |
1105 | ||
1106 | /* we've taken care of segment sizes earlier when we | |
1107 | cloned the bios. We should never have a segment | |
1108 | truncated at this point */ | |
1109 | BUG_ON(seg_len < len); | |
1110 | ||
1111 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1112 | seg_name, seg_ofs, seg_len, | |
1113 | bio, | |
1114 | NULL, 0, | |
1115 | flags, | |
1116 | ops, | |
1117 | coll, coll_index, | |
1118 | rbd_req_cb, 0, NULL); | |
1119 | ||
1120 | rbd_destroy_ops(ops); | |
1121 | done: | |
1122 | kfree(seg_name); | |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Request async osd write | |
1128 | */ | |
1129 | static int rbd_req_write(struct request *rq, | |
1130 | struct rbd_device *rbd_dev, | |
1131 | struct ceph_snap_context *snapc, | |
1132 | u64 ofs, u64 len, | |
1133 | struct bio *bio, | |
1134 | struct rbd_req_coll *coll, | |
1135 | int coll_index) | |
1136 | { | |
1137 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1138 | CEPH_OSD_OP_WRITE, | |
1139 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1140 | ofs, len, bio, coll, coll_index); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Request async osd read | |
1145 | */ | |
1146 | static int rbd_req_read(struct request *rq, | |
1147 | struct rbd_device *rbd_dev, | |
1148 | u64 snapid, | |
1149 | u64 ofs, u64 len, | |
1150 | struct bio *bio, | |
1151 | struct rbd_req_coll *coll, | |
1152 | int coll_index) | |
1153 | { | |
1154 | return rbd_do_op(rq, rbd_dev, NULL, | |
1155 | snapid, | |
1156 | CEPH_OSD_OP_READ, | |
1157 | CEPH_OSD_FLAG_READ, | |
1158 | ofs, len, bio, coll, coll_index); | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Request sync osd read | |
1163 | */ | |
1164 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, | |
1165 | struct ceph_snap_context *snapc, | |
1166 | u64 snapid, | |
1167 | const char *object_name, | |
1168 | u64 ofs, u64 len, | |
1169 | char *buf, | |
1170 | u64 *ver) | |
1171 | { | |
1172 | return rbd_req_sync_op(rbd_dev, NULL, | |
1173 | snapid, | |
1174 | CEPH_OSD_OP_READ, | |
1175 | CEPH_OSD_FLAG_READ, | |
1176 | NULL, | |
1177 | object_name, ofs, len, buf, NULL, ver); | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Request sync osd watch | |
1182 | */ | |
1183 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, | |
1184 | u64 ver, | |
1185 | u64 notify_id, | |
1186 | const char *object_name) | |
1187 | { | |
1188 | struct ceph_osd_req_op *ops; | |
1189 | int ret; | |
1190 | ||
1191 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); | |
1192 | if (ret < 0) | |
1193 | return ret; | |
1194 | ||
1195 | ops[0].watch.ver = cpu_to_le64(ver); | |
1196 | ops[0].watch.cookie = notify_id; | |
1197 | ops[0].watch.flag = 0; | |
1198 | ||
1199 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, | |
1200 | object_name, 0, 0, NULL, | |
1201 | NULL, 0, | |
1202 | CEPH_OSD_FLAG_READ, | |
1203 | ops, | |
1204 | NULL, 0, | |
1205 | rbd_simple_req_cb, 0, NULL); | |
1206 | ||
1207 | rbd_destroy_ops(ops); | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1212 | { | |
1213 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
1214 | u64 hver; | |
1215 | int rc; | |
1216 | ||
1217 | if (!rbd_dev) | |
1218 | return; | |
1219 | ||
1220 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", | |
1221 | rbd_dev->header_name, notify_id, (int) opcode); | |
1222 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1223 | rc = __rbd_refresh_header(rbd_dev); | |
1224 | hver = rbd_dev->header.obj_version; | |
1225 | mutex_unlock(&ctl_mutex); | |
1226 | if (rc) | |
1227 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " | |
1228 | " update snaps: %d\n", rbd_dev->major, rc); | |
1229 | ||
1230 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id, rbd_dev->header_name); | |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * Request sync osd watch | |
1235 | */ | |
1236 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev, | |
1237 | const char *object_name, | |
1238 | u64 ver) | |
1239 | { | |
1240 | struct ceph_osd_req_op *ops; | |
1241 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
1242 | ||
1243 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1244 | if (ret < 0) | |
1245 | return ret; | |
1246 | ||
1247 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
1248 | (void *)rbd_dev, &rbd_dev->watch_event); | |
1249 | if (ret < 0) | |
1250 | goto fail; | |
1251 | ||
1252 | ops[0].watch.ver = cpu_to_le64(ver); | |
1253 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); | |
1254 | ops[0].watch.flag = 1; | |
1255 | ||
1256 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
1257 | CEPH_NOSNAP, | |
1258 | 0, | |
1259 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1260 | ops, | |
1261 | object_name, 0, 0, NULL, | |
1262 | &rbd_dev->watch_request, NULL); | |
1263 | ||
1264 | if (ret < 0) | |
1265 | goto fail_event; | |
1266 | ||
1267 | rbd_destroy_ops(ops); | |
1268 | return 0; | |
1269 | ||
1270 | fail_event: | |
1271 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
1272 | rbd_dev->watch_event = NULL; | |
1273 | fail: | |
1274 | rbd_destroy_ops(ops); | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Request sync osd unwatch | |
1280 | */ | |
1281 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev, | |
1282 | const char *object_name) | |
1283 | { | |
1284 | struct ceph_osd_req_op *ops; | |
1285 | ||
1286 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1287 | if (ret < 0) | |
1288 | return ret; | |
1289 | ||
1290 | ops[0].watch.ver = 0; | |
1291 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); | |
1292 | ops[0].watch.flag = 0; | |
1293 | ||
1294 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
1295 | CEPH_NOSNAP, | |
1296 | 0, | |
1297 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1298 | ops, | |
1299 | object_name, 0, 0, NULL, NULL, NULL); | |
1300 | ||
1301 | rbd_destroy_ops(ops); | |
1302 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
1303 | rbd_dev->watch_event = NULL; | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | struct rbd_notify_info { | |
1308 | struct rbd_device *rbd_dev; | |
1309 | }; | |
1310 | ||
1311 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1312 | { | |
1313 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
1314 | if (!rbd_dev) | |
1315 | return; | |
1316 | ||
1317 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", | |
1318 | rbd_dev->header_name, | |
1319 | notify_id, (int)opcode); | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Request sync osd notify | |
1324 | */ | |
1325 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev, | |
1326 | const char *object_name) | |
1327 | { | |
1328 | struct ceph_osd_req_op *ops; | |
1329 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
1330 | struct ceph_osd_event *event; | |
1331 | struct rbd_notify_info info; | |
1332 | int payload_len = sizeof(u32) + sizeof(u32); | |
1333 | int ret; | |
1334 | ||
1335 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); | |
1336 | if (ret < 0) | |
1337 | return ret; | |
1338 | ||
1339 | info.rbd_dev = rbd_dev; | |
1340 | ||
1341 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1342 | (void *)&info, &event); | |
1343 | if (ret < 0) | |
1344 | goto fail; | |
1345 | ||
1346 | ops[0].watch.ver = 1; | |
1347 | ops[0].watch.flag = 1; | |
1348 | ops[0].watch.cookie = event->cookie; | |
1349 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1350 | ops[0].watch.timeout = 12; | |
1351 | ||
1352 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
1353 | CEPH_NOSNAP, | |
1354 | 0, | |
1355 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1356 | ops, | |
1357 | object_name, 0, 0, NULL, NULL, NULL); | |
1358 | if (ret < 0) | |
1359 | goto fail_event; | |
1360 | ||
1361 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1362 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1363 | rbd_destroy_ops(ops); | |
1364 | return 0; | |
1365 | ||
1366 | fail_event: | |
1367 | ceph_osdc_cancel_event(event); | |
1368 | fail: | |
1369 | rbd_destroy_ops(ops); | |
1370 | return ret; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Request sync osd read | |
1375 | */ | |
1376 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, | |
1377 | const char *object_name, | |
1378 | const char *class_name, | |
1379 | const char *method_name, | |
1380 | const char *data, | |
1381 | int len, | |
1382 | u64 *ver) | |
1383 | { | |
1384 | struct ceph_osd_req_op *ops; | |
1385 | int class_name_len = strlen(class_name); | |
1386 | int method_name_len = strlen(method_name); | |
1387 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
1388 | class_name_len + method_name_len + len); | |
1389 | if (ret < 0) | |
1390 | return ret; | |
1391 | ||
1392 | ops[0].cls.class_name = class_name; | |
1393 | ops[0].cls.class_len = (__u8) class_name_len; | |
1394 | ops[0].cls.method_name = method_name; | |
1395 | ops[0].cls.method_len = (__u8) method_name_len; | |
1396 | ops[0].cls.argc = 0; | |
1397 | ops[0].cls.indata = data; | |
1398 | ops[0].cls.indata_len = len; | |
1399 | ||
1400 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
1401 | CEPH_NOSNAP, | |
1402 | 0, | |
1403 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1404 | ops, | |
1405 | object_name, 0, 0, NULL, NULL, ver); | |
1406 | ||
1407 | rbd_destroy_ops(ops); | |
1408 | ||
1409 | dout("cls_exec returned %d\n", ret); | |
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) | |
1414 | { | |
1415 | struct rbd_req_coll *coll = | |
1416 | kzalloc(sizeof(struct rbd_req_coll) + | |
1417 | sizeof(struct rbd_req_status) * num_reqs, | |
1418 | GFP_ATOMIC); | |
1419 | ||
1420 | if (!coll) | |
1421 | return NULL; | |
1422 | coll->total = num_reqs; | |
1423 | kref_init(&coll->kref); | |
1424 | return coll; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * block device queue callback | |
1429 | */ | |
1430 | static void rbd_rq_fn(struct request_queue *q) | |
1431 | { | |
1432 | struct rbd_device *rbd_dev = q->queuedata; | |
1433 | struct request *rq; | |
1434 | struct bio_pair *bp = NULL; | |
1435 | ||
1436 | while ((rq = blk_fetch_request(q))) { | |
1437 | struct bio *bio; | |
1438 | struct bio *rq_bio, *next_bio = NULL; | |
1439 | bool do_write; | |
1440 | int size, op_size = 0; | |
1441 | u64 ofs; | |
1442 | int num_segs, cur_seg = 0; | |
1443 | struct rbd_req_coll *coll; | |
1444 | struct ceph_snap_context *snapc; | |
1445 | ||
1446 | /* peek at request from block layer */ | |
1447 | if (!rq) | |
1448 | break; | |
1449 | ||
1450 | dout("fetched request\n"); | |
1451 | ||
1452 | /* filter out block requests we don't understand */ | |
1453 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1454 | __blk_end_request_all(rq, 0); | |
1455 | continue; | |
1456 | } | |
1457 | ||
1458 | /* deduce our operation (read, write) */ | |
1459 | do_write = (rq_data_dir(rq) == WRITE); | |
1460 | ||
1461 | size = blk_rq_bytes(rq); | |
1462 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; | |
1463 | rq_bio = rq->bio; | |
1464 | if (do_write && rbd_dev->read_only) { | |
1465 | __blk_end_request_all(rq, -EROFS); | |
1466 | continue; | |
1467 | } | |
1468 | ||
1469 | spin_unlock_irq(q->queue_lock); | |
1470 | ||
1471 | down_read(&rbd_dev->header_rwsem); | |
1472 | ||
1473 | if (rbd_dev->snap_id != CEPH_NOSNAP && !rbd_dev->snap_exists) { | |
1474 | up_read(&rbd_dev->header_rwsem); | |
1475 | dout("request for non-existent snapshot"); | |
1476 | spin_lock_irq(q->queue_lock); | |
1477 | __blk_end_request_all(rq, -ENXIO); | |
1478 | continue; | |
1479 | } | |
1480 | ||
1481 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); | |
1482 | ||
1483 | up_read(&rbd_dev->header_rwsem); | |
1484 | ||
1485 | dout("%s 0x%x bytes at 0x%llx\n", | |
1486 | do_write ? "write" : "read", | |
1487 | size, blk_rq_pos(rq) * SECTOR_SIZE); | |
1488 | ||
1489 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); | |
1490 | coll = rbd_alloc_coll(num_segs); | |
1491 | if (!coll) { | |
1492 | spin_lock_irq(q->queue_lock); | |
1493 | __blk_end_request_all(rq, -ENOMEM); | |
1494 | ceph_put_snap_context(snapc); | |
1495 | continue; | |
1496 | } | |
1497 | ||
1498 | do { | |
1499 | /* a bio clone to be passed down to OSD req */ | |
1500 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1501 | op_size = rbd_get_segment(&rbd_dev->header, | |
1502 | rbd_dev->header.object_prefix, | |
1503 | ofs, size, | |
1504 | NULL, NULL); | |
1505 | kref_get(&coll->kref); | |
1506 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, | |
1507 | op_size, GFP_ATOMIC); | |
1508 | if (!bio) { | |
1509 | rbd_coll_end_req_index(rq, coll, cur_seg, | |
1510 | -ENOMEM, op_size); | |
1511 | goto next_seg; | |
1512 | } | |
1513 | ||
1514 | ||
1515 | /* init OSD command: write or read */ | |
1516 | if (do_write) | |
1517 | rbd_req_write(rq, rbd_dev, | |
1518 | snapc, | |
1519 | ofs, | |
1520 | op_size, bio, | |
1521 | coll, cur_seg); | |
1522 | else | |
1523 | rbd_req_read(rq, rbd_dev, | |
1524 | rbd_dev->snap_id, | |
1525 | ofs, | |
1526 | op_size, bio, | |
1527 | coll, cur_seg); | |
1528 | ||
1529 | next_seg: | |
1530 | size -= op_size; | |
1531 | ofs += op_size; | |
1532 | ||
1533 | cur_seg++; | |
1534 | rq_bio = next_bio; | |
1535 | } while (size > 0); | |
1536 | kref_put(&coll->kref, rbd_coll_release); | |
1537 | ||
1538 | if (bp) | |
1539 | bio_pair_release(bp); | |
1540 | spin_lock_irq(q->queue_lock); | |
1541 | ||
1542 | ceph_put_snap_context(snapc); | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1548 | * multiple osd objects. One exception would be with a single page bios, | |
1549 | * which we handle later at bio_chain_clone | |
1550 | */ | |
1551 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1552 | struct bio_vec *bvec) | |
1553 | { | |
1554 | struct rbd_device *rbd_dev = q->queuedata; | |
1555 | unsigned int chunk_sectors; | |
1556 | sector_t sector; | |
1557 | unsigned int bio_sectors; | |
1558 | int max; | |
1559 | ||
1560 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
1561 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1562 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1563 | ||
1564 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) | |
1565 | + bio_sectors)) << SECTOR_SHIFT; | |
1566 | if (max < 0) | |
1567 | max = 0; /* bio_add cannot handle a negative return */ | |
1568 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1569 | return bvec->bv_len; | |
1570 | return max; | |
1571 | } | |
1572 | ||
1573 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1574 | { | |
1575 | struct gendisk *disk = rbd_dev->disk; | |
1576 | ||
1577 | if (!disk) | |
1578 | return; | |
1579 | ||
1580 | rbd_header_free(&rbd_dev->header); | |
1581 | ||
1582 | if (disk->flags & GENHD_FL_UP) | |
1583 | del_gendisk(disk); | |
1584 | if (disk->queue) | |
1585 | blk_cleanup_queue(disk->queue); | |
1586 | put_disk(disk); | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * reload the ondisk the header | |
1591 | */ | |
1592 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1593 | struct rbd_image_header *header) | |
1594 | { | |
1595 | ssize_t rc; | |
1596 | struct rbd_image_header_ondisk *dh; | |
1597 | u32 snap_count = 0; | |
1598 | u64 ver; | |
1599 | size_t len; | |
1600 | ||
1601 | /* | |
1602 | * First reads the fixed-size header to determine the number | |
1603 | * of snapshots, then re-reads it, along with all snapshot | |
1604 | * records as well as their stored names. | |
1605 | */ | |
1606 | len = sizeof (*dh); | |
1607 | while (1) { | |
1608 | dh = kmalloc(len, GFP_KERNEL); | |
1609 | if (!dh) | |
1610 | return -ENOMEM; | |
1611 | ||
1612 | rc = rbd_req_sync_read(rbd_dev, | |
1613 | NULL, CEPH_NOSNAP, | |
1614 | rbd_dev->header_name, | |
1615 | 0, len, | |
1616 | (char *)dh, &ver); | |
1617 | if (rc < 0) | |
1618 | goto out_dh; | |
1619 | ||
1620 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
1621 | if (rc < 0) { | |
1622 | if (rc == -ENXIO) | |
1623 | pr_warning("unrecognized header format" | |
1624 | " for image %s\n", | |
1625 | rbd_dev->image_name); | |
1626 | goto out_dh; | |
1627 | } | |
1628 | ||
1629 | if (snap_count == header->total_snaps) | |
1630 | break; | |
1631 | ||
1632 | snap_count = header->total_snaps; | |
1633 | len = sizeof (*dh) + | |
1634 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1635 | header->snap_names_len; | |
1636 | ||
1637 | rbd_header_free(header); | |
1638 | kfree(dh); | |
1639 | } | |
1640 | header->obj_version = ver; | |
1641 | ||
1642 | out_dh: | |
1643 | kfree(dh); | |
1644 | return rc; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * create a snapshot | |
1649 | */ | |
1650 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, | |
1651 | const char *snap_name, | |
1652 | gfp_t gfp_flags) | |
1653 | { | |
1654 | int name_len = strlen(snap_name); | |
1655 | u64 new_snapid; | |
1656 | int ret; | |
1657 | void *data, *p, *e; | |
1658 | u64 ver; | |
1659 | struct ceph_mon_client *monc; | |
1660 | ||
1661 | /* we should create a snapshot only if we're pointing at the head */ | |
1662 | if (rbd_dev->snap_id != CEPH_NOSNAP) | |
1663 | return -EINVAL; | |
1664 | ||
1665 | monc = &rbd_dev->rbd_client->client->monc; | |
1666 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
1667 | dout("created snapid=%lld\n", new_snapid); | |
1668 | if (ret < 0) | |
1669 | return ret; | |
1670 | ||
1671 | data = kmalloc(name_len + 16, gfp_flags); | |
1672 | if (!data) | |
1673 | return -ENOMEM; | |
1674 | ||
1675 | p = data; | |
1676 | e = data + name_len + 16; | |
1677 | ||
1678 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); | |
1679 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
1680 | ||
1681 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, | |
1682 | "rbd", "snap_add", | |
1683 | data, p - data, &ver); | |
1684 | ||
1685 | kfree(data); | |
1686 | ||
1687 | return ret < 0 ? ret : 0; | |
1688 | bad: | |
1689 | return -ERANGE; | |
1690 | } | |
1691 | ||
1692 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) | |
1693 | { | |
1694 | struct rbd_snap *snap; | |
1695 | struct rbd_snap *next; | |
1696 | ||
1697 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) | |
1698 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1699 | } | |
1700 | ||
1701 | /* | |
1702 | * only read the first part of the ondisk header, without the snaps info | |
1703 | */ | |
1704 | static int __rbd_refresh_header(struct rbd_device *rbd_dev) | |
1705 | { | |
1706 | int ret; | |
1707 | struct rbd_image_header h; | |
1708 | ||
1709 | ret = rbd_read_header(rbd_dev, &h); | |
1710 | if (ret < 0) | |
1711 | return ret; | |
1712 | ||
1713 | down_write(&rbd_dev->header_rwsem); | |
1714 | ||
1715 | /* resized? */ | |
1716 | if (rbd_dev->snap_id == CEPH_NOSNAP) { | |
1717 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1718 | ||
1719 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1720 | set_capacity(rbd_dev->disk, size); | |
1721 | } | |
1722 | ||
1723 | /* rbd_dev->header.object_prefix shouldn't change */ | |
1724 | kfree(rbd_dev->header.snap_sizes); | |
1725 | kfree(rbd_dev->header.snap_names); | |
1726 | /* osd requests may still refer to snapc */ | |
1727 | ceph_put_snap_context(rbd_dev->header.snapc); | |
1728 | ||
1729 | rbd_dev->header.obj_version = h.obj_version; | |
1730 | rbd_dev->header.image_size = h.image_size; | |
1731 | rbd_dev->header.total_snaps = h.total_snaps; | |
1732 | rbd_dev->header.snapc = h.snapc; | |
1733 | rbd_dev->header.snap_names = h.snap_names; | |
1734 | rbd_dev->header.snap_names_len = h.snap_names_len; | |
1735 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
1736 | /* Free the extra copy of the object prefix */ | |
1737 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1738 | kfree(h.object_prefix); | |
1739 | ||
1740 | ret = __rbd_init_snaps_header(rbd_dev); | |
1741 | ||
1742 | up_write(&rbd_dev->header_rwsem); | |
1743 | ||
1744 | return ret; | |
1745 | } | |
1746 | ||
1747 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1748 | { | |
1749 | struct gendisk *disk; | |
1750 | struct request_queue *q; | |
1751 | int rc; | |
1752 | u64 segment_size; | |
1753 | u64 total_size = 0; | |
1754 | ||
1755 | /* contact OSD, request size info about the object being mapped */ | |
1756 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1757 | if (rc) | |
1758 | return rc; | |
1759 | ||
1760 | /* no need to lock here, as rbd_dev is not registered yet */ | |
1761 | rc = __rbd_init_snaps_header(rbd_dev); | |
1762 | if (rc) | |
1763 | return rc; | |
1764 | ||
1765 | rc = rbd_header_set_snap(rbd_dev, &total_size); | |
1766 | if (rc) | |
1767 | return rc; | |
1768 | ||
1769 | /* create gendisk info */ | |
1770 | rc = -ENOMEM; | |
1771 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1772 | if (!disk) | |
1773 | goto out; | |
1774 | ||
1775 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", | |
1776 | rbd_dev->id); | |
1777 | disk->major = rbd_dev->major; | |
1778 | disk->first_minor = 0; | |
1779 | disk->fops = &rbd_bd_ops; | |
1780 | disk->private_data = rbd_dev; | |
1781 | ||
1782 | /* init rq */ | |
1783 | rc = -ENOMEM; | |
1784 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1785 | if (!q) | |
1786 | goto out_disk; | |
1787 | ||
1788 | /* We use the default size, but let's be explicit about it. */ | |
1789 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1790 | ||
1791 | /* set io sizes to object size */ | |
1792 | segment_size = rbd_obj_bytes(&rbd_dev->header); | |
1793 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1794 | blk_queue_max_segment_size(q, segment_size); | |
1795 | blk_queue_io_min(q, segment_size); | |
1796 | blk_queue_io_opt(q, segment_size); | |
1797 | ||
1798 | blk_queue_merge_bvec(q, rbd_merge_bvec); | |
1799 | disk->queue = q; | |
1800 | ||
1801 | q->queuedata = rbd_dev; | |
1802 | ||
1803 | rbd_dev->disk = disk; | |
1804 | rbd_dev->q = q; | |
1805 | ||
1806 | /* finally, announce the disk to the world */ | |
1807 | set_capacity(disk, total_size / SECTOR_SIZE); | |
1808 | add_disk(disk); | |
1809 | ||
1810 | pr_info("%s: added with size 0x%llx\n", | |
1811 | disk->disk_name, (unsigned long long)total_size); | |
1812 | return 0; | |
1813 | ||
1814 | out_disk: | |
1815 | put_disk(disk); | |
1816 | out: | |
1817 | return rc; | |
1818 | } | |
1819 | ||
1820 | /* | |
1821 | sysfs | |
1822 | */ | |
1823 | ||
1824 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) | |
1825 | { | |
1826 | return container_of(dev, struct rbd_device, dev); | |
1827 | } | |
1828 | ||
1829 | static ssize_t rbd_size_show(struct device *dev, | |
1830 | struct device_attribute *attr, char *buf) | |
1831 | { | |
1832 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1833 | sector_t size; | |
1834 | ||
1835 | down_read(&rbd_dev->header_rwsem); | |
1836 | size = get_capacity(rbd_dev->disk); | |
1837 | up_read(&rbd_dev->header_rwsem); | |
1838 | ||
1839 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); | |
1840 | } | |
1841 | ||
1842 | static ssize_t rbd_major_show(struct device *dev, | |
1843 | struct device_attribute *attr, char *buf) | |
1844 | { | |
1845 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1846 | ||
1847 | return sprintf(buf, "%d\n", rbd_dev->major); | |
1848 | } | |
1849 | ||
1850 | static ssize_t rbd_client_id_show(struct device *dev, | |
1851 | struct device_attribute *attr, char *buf) | |
1852 | { | |
1853 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1854 | ||
1855 | return sprintf(buf, "client%lld\n", | |
1856 | ceph_client_id(rbd_dev->rbd_client->client)); | |
1857 | } | |
1858 | ||
1859 | static ssize_t rbd_pool_show(struct device *dev, | |
1860 | struct device_attribute *attr, char *buf) | |
1861 | { | |
1862 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1863 | ||
1864 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1865 | } | |
1866 | ||
1867 | static ssize_t rbd_pool_id_show(struct device *dev, | |
1868 | struct device_attribute *attr, char *buf) | |
1869 | { | |
1870 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1871 | ||
1872 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1873 | } | |
1874 | ||
1875 | static ssize_t rbd_name_show(struct device *dev, | |
1876 | struct device_attribute *attr, char *buf) | |
1877 | { | |
1878 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1879 | ||
1880 | return sprintf(buf, "%s\n", rbd_dev->image_name); | |
1881 | } | |
1882 | ||
1883 | static ssize_t rbd_snap_show(struct device *dev, | |
1884 | struct device_attribute *attr, | |
1885 | char *buf) | |
1886 | { | |
1887 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1888 | ||
1889 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1890 | } | |
1891 | ||
1892 | static ssize_t rbd_image_refresh(struct device *dev, | |
1893 | struct device_attribute *attr, | |
1894 | const char *buf, | |
1895 | size_t size) | |
1896 | { | |
1897 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1898 | int rc; | |
1899 | int ret = size; | |
1900 | ||
1901 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1902 | ||
1903 | rc = __rbd_refresh_header(rbd_dev); | |
1904 | if (rc < 0) | |
1905 | ret = rc; | |
1906 | ||
1907 | mutex_unlock(&ctl_mutex); | |
1908 | return ret; | |
1909 | } | |
1910 | ||
1911 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); | |
1912 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1913 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1914 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
1915 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); | |
1916 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); | |
1917 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1918 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1919 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
1920 | ||
1921 | static struct attribute *rbd_attrs[] = { | |
1922 | &dev_attr_size.attr, | |
1923 | &dev_attr_major.attr, | |
1924 | &dev_attr_client_id.attr, | |
1925 | &dev_attr_pool.attr, | |
1926 | &dev_attr_pool_id.attr, | |
1927 | &dev_attr_name.attr, | |
1928 | &dev_attr_current_snap.attr, | |
1929 | &dev_attr_refresh.attr, | |
1930 | &dev_attr_create_snap.attr, | |
1931 | NULL | |
1932 | }; | |
1933 | ||
1934 | static struct attribute_group rbd_attr_group = { | |
1935 | .attrs = rbd_attrs, | |
1936 | }; | |
1937 | ||
1938 | static const struct attribute_group *rbd_attr_groups[] = { | |
1939 | &rbd_attr_group, | |
1940 | NULL | |
1941 | }; | |
1942 | ||
1943 | static void rbd_sysfs_dev_release(struct device *dev) | |
1944 | { | |
1945 | } | |
1946 | ||
1947 | static struct device_type rbd_device_type = { | |
1948 | .name = "rbd", | |
1949 | .groups = rbd_attr_groups, | |
1950 | .release = rbd_sysfs_dev_release, | |
1951 | }; | |
1952 | ||
1953 | ||
1954 | /* | |
1955 | sysfs - snapshots | |
1956 | */ | |
1957 | ||
1958 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1959 | struct device_attribute *attr, | |
1960 | char *buf) | |
1961 | { | |
1962 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1963 | ||
1964 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); | |
1965 | } | |
1966 | ||
1967 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1968 | struct device_attribute *attr, | |
1969 | char *buf) | |
1970 | { | |
1971 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1972 | ||
1973 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); | |
1974 | } | |
1975 | ||
1976 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1977 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1978 | ||
1979 | static struct attribute *rbd_snap_attrs[] = { | |
1980 | &dev_attr_snap_size.attr, | |
1981 | &dev_attr_snap_id.attr, | |
1982 | NULL, | |
1983 | }; | |
1984 | ||
1985 | static struct attribute_group rbd_snap_attr_group = { | |
1986 | .attrs = rbd_snap_attrs, | |
1987 | }; | |
1988 | ||
1989 | static void rbd_snap_dev_release(struct device *dev) | |
1990 | { | |
1991 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1992 | kfree(snap->name); | |
1993 | kfree(snap); | |
1994 | } | |
1995 | ||
1996 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
1997 | &rbd_snap_attr_group, | |
1998 | NULL | |
1999 | }; | |
2000 | ||
2001 | static struct device_type rbd_snap_device_type = { | |
2002 | .groups = rbd_snap_attr_groups, | |
2003 | .release = rbd_snap_dev_release, | |
2004 | }; | |
2005 | ||
2006 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
2007 | struct rbd_snap *snap) | |
2008 | { | |
2009 | list_del(&snap->node); | |
2010 | device_unregister(&snap->dev); | |
2011 | } | |
2012 | ||
2013 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
2014 | struct rbd_snap *snap, | |
2015 | struct device *parent) | |
2016 | { | |
2017 | struct device *dev = &snap->dev; | |
2018 | int ret; | |
2019 | ||
2020 | dev->type = &rbd_snap_device_type; | |
2021 | dev->parent = parent; | |
2022 | dev->release = rbd_snap_dev_release; | |
2023 | dev_set_name(dev, "snap_%s", snap->name); | |
2024 | ret = device_register(dev); | |
2025 | ||
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
2030 | int i, const char *name, | |
2031 | struct rbd_snap **snapp) | |
2032 | { | |
2033 | int ret; | |
2034 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
2035 | if (!snap) | |
2036 | return -ENOMEM; | |
2037 | snap->name = kstrdup(name, GFP_KERNEL); | |
2038 | snap->size = rbd_dev->header.snap_sizes[i]; | |
2039 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2040 | if (device_is_registered(&rbd_dev->dev)) { | |
2041 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2042 | &rbd_dev->dev); | |
2043 | if (ret < 0) | |
2044 | goto err; | |
2045 | } | |
2046 | *snapp = snap; | |
2047 | return 0; | |
2048 | err: | |
2049 | kfree(snap->name); | |
2050 | kfree(snap); | |
2051 | return ret; | |
2052 | } | |
2053 | ||
2054 | /* | |
2055 | * search for the previous snap in a null delimited string list | |
2056 | */ | |
2057 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
2058 | { | |
2059 | if (name < start + 2) | |
2060 | return NULL; | |
2061 | ||
2062 | name -= 2; | |
2063 | while (*name) { | |
2064 | if (name == start) | |
2065 | return start; | |
2066 | name--; | |
2067 | } | |
2068 | return name + 1; | |
2069 | } | |
2070 | ||
2071 | /* | |
2072 | * compare the old list of snapshots that we have to what's in the header | |
2073 | * and update it accordingly. Note that the header holds the snapshots | |
2074 | * in a reverse order (from newest to oldest) and we need to go from | |
2075 | * older to new so that we don't get a duplicate snap name when | |
2076 | * doing the process (e.g., removed snapshot and recreated a new | |
2077 | * one with the same name. | |
2078 | */ | |
2079 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2080 | { | |
2081 | const char *name, *first_name; | |
2082 | int i = rbd_dev->header.total_snaps; | |
2083 | struct rbd_snap *snap, *old_snap = NULL; | |
2084 | int ret; | |
2085 | struct list_head *p, *n; | |
2086 | ||
2087 | first_name = rbd_dev->header.snap_names; | |
2088 | name = first_name + rbd_dev->header.snap_names_len; | |
2089 | ||
2090 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2091 | u64 cur_id; | |
2092 | ||
2093 | old_snap = list_entry(p, struct rbd_snap, node); | |
2094 | ||
2095 | if (i) | |
2096 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2097 | ||
2098 | if (!i || old_snap->id < cur_id) { | |
2099 | /* | |
2100 | * old_snap->id was skipped, thus was | |
2101 | * removed. If this rbd_dev is mapped to | |
2102 | * the removed snapshot, record that it no | |
2103 | * longer exists, to prevent further I/O. | |
2104 | */ | |
2105 | if (rbd_dev->snap_id == old_snap->id) | |
2106 | rbd_dev->snap_exists = false; | |
2107 | __rbd_remove_snap_dev(rbd_dev, old_snap); | |
2108 | continue; | |
2109 | } | |
2110 | if (old_snap->id == cur_id) { | |
2111 | /* we have this snapshot already */ | |
2112 | i--; | |
2113 | name = rbd_prev_snap_name(name, first_name); | |
2114 | continue; | |
2115 | } | |
2116 | for (; i > 0; | |
2117 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2118 | if (!name) { | |
2119 | WARN_ON(1); | |
2120 | return -EINVAL; | |
2121 | } | |
2122 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2123 | /* snapshot removal? handle it above */ | |
2124 | if (cur_id >= old_snap->id) | |
2125 | break; | |
2126 | /* a new snapshot */ | |
2127 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2128 | if (ret < 0) | |
2129 | return ret; | |
2130 | ||
2131 | /* note that we add it backward so using n and not p */ | |
2132 | list_add(&snap->node, n); | |
2133 | p = &snap->node; | |
2134 | } | |
2135 | } | |
2136 | /* we're done going over the old snap list, just add what's left */ | |
2137 | for (; i > 0; i--) { | |
2138 | name = rbd_prev_snap_name(name, first_name); | |
2139 | if (!name) { | |
2140 | WARN_ON(1); | |
2141 | return -EINVAL; | |
2142 | } | |
2143 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2144 | if (ret < 0) | |
2145 | return ret; | |
2146 | list_add(&snap->node, &rbd_dev->snaps); | |
2147 | } | |
2148 | ||
2149 | return 0; | |
2150 | } | |
2151 | ||
2152 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) | |
2153 | { | |
2154 | int ret; | |
2155 | struct device *dev; | |
2156 | struct rbd_snap *snap; | |
2157 | ||
2158 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2159 | dev = &rbd_dev->dev; | |
2160 | ||
2161 | dev->bus = &rbd_bus_type; | |
2162 | dev->type = &rbd_device_type; | |
2163 | dev->parent = &rbd_root_dev; | |
2164 | dev->release = rbd_dev_release; | |
2165 | dev_set_name(dev, "%d", rbd_dev->id); | |
2166 | ret = device_register(dev); | |
2167 | if (ret < 0) | |
2168 | goto out; | |
2169 | ||
2170 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2171 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2172 | &rbd_dev->dev); | |
2173 | if (ret < 0) | |
2174 | break; | |
2175 | } | |
2176 | out: | |
2177 | mutex_unlock(&ctl_mutex); | |
2178 | return ret; | |
2179 | } | |
2180 | ||
2181 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) | |
2182 | { | |
2183 | device_unregister(&rbd_dev->dev); | |
2184 | } | |
2185 | ||
2186 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) | |
2187 | { | |
2188 | int ret, rc; | |
2189 | ||
2190 | do { | |
2191 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->header_name, | |
2192 | rbd_dev->header.obj_version); | |
2193 | if (ret == -ERANGE) { | |
2194 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2195 | rc = __rbd_refresh_header(rbd_dev); | |
2196 | mutex_unlock(&ctl_mutex); | |
2197 | if (rc < 0) | |
2198 | return rc; | |
2199 | } | |
2200 | } while (ret == -ERANGE); | |
2201 | ||
2202 | return ret; | |
2203 | } | |
2204 | ||
2205 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); | |
2206 | ||
2207 | /* | |
2208 | * Get a unique rbd identifier for the given new rbd_dev, and add | |
2209 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
2210 | */ | |
2211 | static void rbd_id_get(struct rbd_device *rbd_dev) | |
2212 | { | |
2213 | rbd_dev->id = atomic64_inc_return(&rbd_id_max); | |
2214 | ||
2215 | spin_lock(&rbd_dev_list_lock); | |
2216 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2217 | spin_unlock(&rbd_dev_list_lock); | |
2218 | } | |
2219 | ||
2220 | /* | |
2221 | * Remove an rbd_dev from the global list, and record that its | |
2222 | * identifier is no longer in use. | |
2223 | */ | |
2224 | static void rbd_id_put(struct rbd_device *rbd_dev) | |
2225 | { | |
2226 | struct list_head *tmp; | |
2227 | int rbd_id = rbd_dev->id; | |
2228 | int max_id; | |
2229 | ||
2230 | BUG_ON(rbd_id < 1); | |
2231 | ||
2232 | spin_lock(&rbd_dev_list_lock); | |
2233 | list_del_init(&rbd_dev->node); | |
2234 | ||
2235 | /* | |
2236 | * If the id being "put" is not the current maximum, there | |
2237 | * is nothing special we need to do. | |
2238 | */ | |
2239 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2240 | spin_unlock(&rbd_dev_list_lock); | |
2241 | return; | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * We need to update the current maximum id. Search the | |
2246 | * list to find out what it is. We're more likely to find | |
2247 | * the maximum at the end, so search the list backward. | |
2248 | */ | |
2249 | max_id = 0; | |
2250 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2251 | struct rbd_device *rbd_dev; | |
2252 | ||
2253 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2254 | if (rbd_id > max_id) | |
2255 | max_id = rbd_id; | |
2256 | } | |
2257 | spin_unlock(&rbd_dev_list_lock); | |
2258 | ||
2259 | /* | |
2260 | * The max id could have been updated by rbd_id_get(), in | |
2261 | * which case it now accurately reflects the new maximum. | |
2262 | * Be careful not to overwrite the maximum value in that | |
2263 | * case. | |
2264 | */ | |
2265 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * Skips over white space at *buf, and updates *buf to point to the | |
2270 | * first found non-space character (if any). Returns the length of | |
2271 | * the token (string of non-white space characters) found. Note | |
2272 | * that *buf must be terminated with '\0'. | |
2273 | */ | |
2274 | static inline size_t next_token(const char **buf) | |
2275 | { | |
2276 | /* | |
2277 | * These are the characters that produce nonzero for | |
2278 | * isspace() in the "C" and "POSIX" locales. | |
2279 | */ | |
2280 | const char *spaces = " \f\n\r\t\v"; | |
2281 | ||
2282 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2283 | ||
2284 | return strcspn(*buf, spaces); /* Return token length */ | |
2285 | } | |
2286 | ||
2287 | /* | |
2288 | * Finds the next token in *buf, and if the provided token buffer is | |
2289 | * big enough, copies the found token into it. The result, if | |
2290 | * copied, is guaranteed to be terminated with '\0'. Note that *buf | |
2291 | * must be terminated with '\0' on entry. | |
2292 | * | |
2293 | * Returns the length of the token found (not including the '\0'). | |
2294 | * Return value will be 0 if no token is found, and it will be >= | |
2295 | * token_size if the token would not fit. | |
2296 | * | |
2297 | * The *buf pointer will be updated to point beyond the end of the | |
2298 | * found token. Note that this occurs even if the token buffer is | |
2299 | * too small to hold it. | |
2300 | */ | |
2301 | static inline size_t copy_token(const char **buf, | |
2302 | char *token, | |
2303 | size_t token_size) | |
2304 | { | |
2305 | size_t len; | |
2306 | ||
2307 | len = next_token(buf); | |
2308 | if (len < token_size) { | |
2309 | memcpy(token, *buf, len); | |
2310 | *(token + len) = '\0'; | |
2311 | } | |
2312 | *buf += len; | |
2313 | ||
2314 | return len; | |
2315 | } | |
2316 | ||
2317 | /* | |
2318 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2319 | * enough to hold a copy of it, and copies the token into the new | |
2320 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2321 | * that a duplicate buffer is created even for a zero-length token. | |
2322 | * | |
2323 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2324 | * pointer if memory for the duplicate was not available. If | |
2325 | * the lenp argument is a non-null pointer, the length of the token | |
2326 | * (not including the '\0') is returned in *lenp. | |
2327 | * | |
2328 | * If successful, the *buf pointer will be updated to point beyond | |
2329 | * the end of the found token. | |
2330 | * | |
2331 | * Note: uses GFP_KERNEL for allocation. | |
2332 | */ | |
2333 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2334 | { | |
2335 | char *dup; | |
2336 | size_t len; | |
2337 | ||
2338 | len = next_token(buf); | |
2339 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2340 | if (!dup) | |
2341 | return NULL; | |
2342 | ||
2343 | memcpy(dup, *buf, len); | |
2344 | *(dup + len) = '\0'; | |
2345 | *buf += len; | |
2346 | ||
2347 | if (lenp) | |
2348 | *lenp = len; | |
2349 | ||
2350 | return dup; | |
2351 | } | |
2352 | ||
2353 | /* | |
2354 | * This fills in the pool_name, image_name, image_name_len, snap_name, | |
2355 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based | |
2356 | * on the list of monitor addresses and other options provided via | |
2357 | * /sys/bus/rbd/add. | |
2358 | * | |
2359 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
2360 | */ | |
2361 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2362 | const char *buf, | |
2363 | const char **mon_addrs, | |
2364 | size_t *mon_addrs_size, | |
2365 | char *options, | |
2366 | size_t options_size) | |
2367 | { | |
2368 | size_t len; | |
2369 | int ret; | |
2370 | ||
2371 | /* The first four tokens are required */ | |
2372 | ||
2373 | len = next_token(&buf); | |
2374 | if (!len) | |
2375 | return -EINVAL; | |
2376 | *mon_addrs_size = len + 1; | |
2377 | *mon_addrs = buf; | |
2378 | ||
2379 | buf += len; | |
2380 | ||
2381 | len = copy_token(&buf, options, options_size); | |
2382 | if (!len || len >= options_size) | |
2383 | return -EINVAL; | |
2384 | ||
2385 | ret = -ENOMEM; | |
2386 | rbd_dev->pool_name = dup_token(&buf, NULL); | |
2387 | if (!rbd_dev->pool_name) | |
2388 | goto out_err; | |
2389 | ||
2390 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); | |
2391 | if (!rbd_dev->image_name) | |
2392 | goto out_err; | |
2393 | ||
2394 | /* Create the name of the header object */ | |
2395 | ||
2396 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len | |
2397 | + sizeof (RBD_SUFFIX), | |
2398 | GFP_KERNEL); | |
2399 | if (!rbd_dev->header_name) | |
2400 | goto out_err; | |
2401 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); | |
2402 | ||
2403 | /* | |
2404 | * The snapshot name is optional. If none is is supplied, | |
2405 | * we use the default value. | |
2406 | */ | |
2407 | rbd_dev->snap_name = dup_token(&buf, &len); | |
2408 | if (!rbd_dev->snap_name) | |
2409 | goto out_err; | |
2410 | if (!len) { | |
2411 | /* Replace the empty name with the default */ | |
2412 | kfree(rbd_dev->snap_name); | |
2413 | rbd_dev->snap_name | |
2414 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2415 | if (!rbd_dev->snap_name) | |
2416 | goto out_err; | |
2417 | ||
2418 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, | |
2419 | sizeof (RBD_SNAP_HEAD_NAME)); | |
2420 | } | |
2421 | ||
2422 | return 0; | |
2423 | ||
2424 | out_err: | |
2425 | kfree(rbd_dev->header_name); | |
2426 | kfree(rbd_dev->image_name); | |
2427 | kfree(rbd_dev->pool_name); | |
2428 | rbd_dev->pool_name = NULL; | |
2429 | ||
2430 | return ret; | |
2431 | } | |
2432 | ||
2433 | static ssize_t rbd_add(struct bus_type *bus, | |
2434 | const char *buf, | |
2435 | size_t count) | |
2436 | { | |
2437 | char *options; | |
2438 | struct rbd_device *rbd_dev = NULL; | |
2439 | const char *mon_addrs = NULL; | |
2440 | size_t mon_addrs_size = 0; | |
2441 | struct ceph_osd_client *osdc; | |
2442 | int rc = -ENOMEM; | |
2443 | ||
2444 | if (!try_module_get(THIS_MODULE)) | |
2445 | return -ENODEV; | |
2446 | ||
2447 | options = kmalloc(count, GFP_KERNEL); | |
2448 | if (!options) | |
2449 | goto err_nomem; | |
2450 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); | |
2451 | if (!rbd_dev) | |
2452 | goto err_nomem; | |
2453 | ||
2454 | /* static rbd_device initialization */ | |
2455 | spin_lock_init(&rbd_dev->lock); | |
2456 | INIT_LIST_HEAD(&rbd_dev->node); | |
2457 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
2458 | init_rwsem(&rbd_dev->header_rwsem); | |
2459 | ||
2460 | /* generate unique id: find highest unique id, add one */ | |
2461 | rbd_id_get(rbd_dev); | |
2462 | ||
2463 | /* Fill in the device name, now that we have its id. */ | |
2464 | BUILD_BUG_ON(DEV_NAME_LEN | |
2465 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
2466 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->id); | |
2467 | ||
2468 | /* parse add command */ | |
2469 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, | |
2470 | options, count); | |
2471 | if (rc) | |
2472 | goto err_put_id; | |
2473 | ||
2474 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, | |
2475 | options); | |
2476 | if (IS_ERR(rbd_dev->rbd_client)) { | |
2477 | rc = PTR_ERR(rbd_dev->rbd_client); | |
2478 | goto err_put_id; | |
2479 | } | |
2480 | ||
2481 | /* pick the pool */ | |
2482 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2483 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); | |
2484 | if (rc < 0) | |
2485 | goto err_out_client; | |
2486 | rbd_dev->pool_id = rc; | |
2487 | ||
2488 | /* register our block device */ | |
2489 | rc = register_blkdev(0, rbd_dev->name); | |
2490 | if (rc < 0) | |
2491 | goto err_out_client; | |
2492 | rbd_dev->major = rc; | |
2493 | ||
2494 | rc = rbd_bus_add_dev(rbd_dev); | |
2495 | if (rc) | |
2496 | goto err_out_blkdev; | |
2497 | ||
2498 | /* | |
2499 | * At this point cleanup in the event of an error is the job | |
2500 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2501 | * | |
2502 | * Set up and announce blkdev mapping. | |
2503 | */ | |
2504 | rc = rbd_init_disk(rbd_dev); | |
2505 | if (rc) | |
2506 | goto err_out_bus; | |
2507 | ||
2508 | rc = rbd_init_watch_dev(rbd_dev); | |
2509 | if (rc) | |
2510 | goto err_out_bus; | |
2511 | ||
2512 | return count; | |
2513 | ||
2514 | err_out_bus: | |
2515 | /* this will also clean up rest of rbd_dev stuff */ | |
2516 | ||
2517 | rbd_bus_del_dev(rbd_dev); | |
2518 | kfree(options); | |
2519 | return rc; | |
2520 | ||
2521 | err_out_blkdev: | |
2522 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2523 | err_out_client: | |
2524 | rbd_put_client(rbd_dev); | |
2525 | err_put_id: | |
2526 | if (rbd_dev->pool_name) { | |
2527 | kfree(rbd_dev->snap_name); | |
2528 | kfree(rbd_dev->header_name); | |
2529 | kfree(rbd_dev->image_name); | |
2530 | kfree(rbd_dev->pool_name); | |
2531 | } | |
2532 | rbd_id_put(rbd_dev); | |
2533 | err_nomem: | |
2534 | kfree(rbd_dev); | |
2535 | kfree(options); | |
2536 | ||
2537 | dout("Error adding device %s\n", buf); | |
2538 | module_put(THIS_MODULE); | |
2539 | ||
2540 | return (ssize_t) rc; | |
2541 | } | |
2542 | ||
2543 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
2544 | { | |
2545 | struct list_head *tmp; | |
2546 | struct rbd_device *rbd_dev; | |
2547 | ||
2548 | spin_lock(&rbd_dev_list_lock); | |
2549 | list_for_each(tmp, &rbd_dev_list) { | |
2550 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2551 | if (rbd_dev->id == id) { | |
2552 | spin_unlock(&rbd_dev_list_lock); | |
2553 | return rbd_dev; | |
2554 | } | |
2555 | } | |
2556 | spin_unlock(&rbd_dev_list_lock); | |
2557 | return NULL; | |
2558 | } | |
2559 | ||
2560 | static void rbd_dev_release(struct device *dev) | |
2561 | { | |
2562 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2563 | ||
2564 | if (rbd_dev->watch_request) { | |
2565 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2566 | ||
2567 | ceph_osdc_unregister_linger_request(&client->osdc, | |
2568 | rbd_dev->watch_request); | |
2569 | } | |
2570 | if (rbd_dev->watch_event) | |
2571 | rbd_req_sync_unwatch(rbd_dev, rbd_dev->header_name); | |
2572 | ||
2573 | rbd_put_client(rbd_dev); | |
2574 | ||
2575 | /* clean up and free blkdev */ | |
2576 | rbd_free_disk(rbd_dev); | |
2577 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2578 | ||
2579 | /* done with the id, and with the rbd_dev */ | |
2580 | kfree(rbd_dev->snap_name); | |
2581 | kfree(rbd_dev->header_name); | |
2582 | kfree(rbd_dev->pool_name); | |
2583 | kfree(rbd_dev->image_name); | |
2584 | rbd_id_put(rbd_dev); | |
2585 | kfree(rbd_dev); | |
2586 | ||
2587 | /* release module ref */ | |
2588 | module_put(THIS_MODULE); | |
2589 | } | |
2590 | ||
2591 | static ssize_t rbd_remove(struct bus_type *bus, | |
2592 | const char *buf, | |
2593 | size_t count) | |
2594 | { | |
2595 | struct rbd_device *rbd_dev = NULL; | |
2596 | int target_id, rc; | |
2597 | unsigned long ul; | |
2598 | int ret = count; | |
2599 | ||
2600 | rc = strict_strtoul(buf, 10, &ul); | |
2601 | if (rc) | |
2602 | return rc; | |
2603 | ||
2604 | /* convert to int; abort if we lost anything in the conversion */ | |
2605 | target_id = (int) ul; | |
2606 | if (target_id != ul) | |
2607 | return -EINVAL; | |
2608 | ||
2609 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2610 | ||
2611 | rbd_dev = __rbd_get_dev(target_id); | |
2612 | if (!rbd_dev) { | |
2613 | ret = -ENOENT; | |
2614 | goto done; | |
2615 | } | |
2616 | ||
2617 | __rbd_remove_all_snaps(rbd_dev); | |
2618 | rbd_bus_del_dev(rbd_dev); | |
2619 | ||
2620 | done: | |
2621 | mutex_unlock(&ctl_mutex); | |
2622 | return ret; | |
2623 | } | |
2624 | ||
2625 | static ssize_t rbd_snap_add(struct device *dev, | |
2626 | struct device_attribute *attr, | |
2627 | const char *buf, | |
2628 | size_t count) | |
2629 | { | |
2630 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2631 | int ret; | |
2632 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
2633 | if (!name) | |
2634 | return -ENOMEM; | |
2635 | ||
2636 | snprintf(name, count, "%s", buf); | |
2637 | ||
2638 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2639 | ||
2640 | ret = rbd_header_add_snap(rbd_dev, | |
2641 | name, GFP_KERNEL); | |
2642 | if (ret < 0) | |
2643 | goto err_unlock; | |
2644 | ||
2645 | ret = __rbd_refresh_header(rbd_dev); | |
2646 | if (ret < 0) | |
2647 | goto err_unlock; | |
2648 | ||
2649 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2650 | trigger a watch callback that would need to get that mutex */ | |
2651 | mutex_unlock(&ctl_mutex); | |
2652 | ||
2653 | /* make a best effort, don't error if failed */ | |
2654 | rbd_req_sync_notify(rbd_dev, rbd_dev->header_name); | |
2655 | ||
2656 | ret = count; | |
2657 | kfree(name); | |
2658 | return ret; | |
2659 | ||
2660 | err_unlock: | |
2661 | mutex_unlock(&ctl_mutex); | |
2662 | kfree(name); | |
2663 | return ret; | |
2664 | } | |
2665 | ||
2666 | /* | |
2667 | * create control files in sysfs | |
2668 | * /sys/bus/rbd/... | |
2669 | */ | |
2670 | static int rbd_sysfs_init(void) | |
2671 | { | |
2672 | int ret; | |
2673 | ||
2674 | ret = device_register(&rbd_root_dev); | |
2675 | if (ret < 0) | |
2676 | return ret; | |
2677 | ||
2678 | ret = bus_register(&rbd_bus_type); | |
2679 | if (ret < 0) | |
2680 | device_unregister(&rbd_root_dev); | |
2681 | ||
2682 | return ret; | |
2683 | } | |
2684 | ||
2685 | static void rbd_sysfs_cleanup(void) | |
2686 | { | |
2687 | bus_unregister(&rbd_bus_type); | |
2688 | device_unregister(&rbd_root_dev); | |
2689 | } | |
2690 | ||
2691 | int __init rbd_init(void) | |
2692 | { | |
2693 | int rc; | |
2694 | ||
2695 | rc = rbd_sysfs_init(); | |
2696 | if (rc) | |
2697 | return rc; | |
2698 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); | |
2699 | return 0; | |
2700 | } | |
2701 | ||
2702 | void __exit rbd_exit(void) | |
2703 | { | |
2704 | rbd_sysfs_cleanup(); | |
2705 | } | |
2706 | ||
2707 | module_init(rbd_init); | |
2708 | module_exit(rbd_exit); | |
2709 | ||
2710 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2711 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2712 | MODULE_DESCRIPTION("rados block device"); | |
2713 | ||
2714 | /* following authorship retained from original osdblk.c */ | |
2715 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2716 | ||
2717 | MODULE_LICENSE("GPL"); |