Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
593a9e7b AE |
44 | /* |
45 | * The basic unit of block I/O is a sector. It is interpreted in a | |
46 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
47 | * universally 512 bytes. These symbols are just slightly more | |
48 | * meaningful than the bare numbers they represent. | |
49 | */ | |
50 | #define SECTOR_SHIFT 9 | |
51 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
52 | ||
f0f8cef5 AE |
53 | #define RBD_DRV_NAME "rbd" |
54 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
55 | |
56 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
57 | ||
602adf40 YS |
58 | #define RBD_MAX_SNAP_NAME_LEN 32 |
59 | #define RBD_MAX_OPT_LEN 1024 | |
60 | ||
61 | #define RBD_SNAP_HEAD_NAME "-" | |
62 | ||
81a89793 AE |
63 | /* |
64 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
65 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
66 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
67 | * enough to hold all possible device names. | |
68 | */ | |
602adf40 | 69 | #define DEV_NAME_LEN 32 |
81a89793 | 70 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 71 | |
59c2be1e YS |
72 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
73 | ||
602adf40 YS |
74 | /* |
75 | * block device image metadata (in-memory version) | |
76 | */ | |
77 | struct rbd_image_header { | |
78 | u64 image_size; | |
849b4260 | 79 | char *object_prefix; |
602adf40 YS |
80 | __u8 obj_order; |
81 | __u8 crypt_type; | |
82 | __u8 comp_type; | |
602adf40 | 83 | struct ceph_snap_context *snapc; |
0f1d3f93 | 84 | u64 snap_names_len; |
602adf40 YS |
85 | u32 total_snaps; |
86 | ||
87 | char *snap_names; | |
88 | u64 *snap_sizes; | |
59c2be1e YS |
89 | |
90 | u64 obj_version; | |
91 | }; | |
92 | ||
93 | struct rbd_options { | |
94 | int notify_timeout; | |
602adf40 YS |
95 | }; |
96 | ||
97 | /* | |
f0f8cef5 | 98 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
99 | */ |
100 | struct rbd_client { | |
101 | struct ceph_client *client; | |
59c2be1e | 102 | struct rbd_options *rbd_opts; |
602adf40 YS |
103 | struct kref kref; |
104 | struct list_head node; | |
105 | }; | |
106 | ||
107 | /* | |
f0f8cef5 | 108 | * a request completion status |
602adf40 | 109 | */ |
1fec7093 YS |
110 | struct rbd_req_status { |
111 | int done; | |
112 | int rc; | |
113 | u64 bytes; | |
114 | }; | |
115 | ||
116 | /* | |
117 | * a collection of requests | |
118 | */ | |
119 | struct rbd_req_coll { | |
120 | int total; | |
121 | int num_done; | |
122 | struct kref kref; | |
123 | struct rbd_req_status status[0]; | |
602adf40 YS |
124 | }; |
125 | ||
f0f8cef5 AE |
126 | /* |
127 | * a single io request | |
128 | */ | |
129 | struct rbd_request { | |
130 | struct request *rq; /* blk layer request */ | |
131 | struct bio *bio; /* cloned bio */ | |
132 | struct page **pages; /* list of used pages */ | |
133 | u64 len; | |
134 | int coll_index; | |
135 | struct rbd_req_coll *coll; | |
136 | }; | |
137 | ||
dfc5606d YS |
138 | struct rbd_snap { |
139 | struct device dev; | |
140 | const char *name; | |
3591538f | 141 | u64 size; |
dfc5606d YS |
142 | struct list_head node; |
143 | u64 id; | |
144 | }; | |
145 | ||
602adf40 YS |
146 | /* |
147 | * a single device | |
148 | */ | |
149 | struct rbd_device { | |
de71a297 | 150 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
151 | |
152 | int major; /* blkdev assigned major */ | |
153 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
154 | struct request_queue *q; | |
155 | ||
602adf40 YS |
156 | struct rbd_client *rbd_client; |
157 | ||
158 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
159 | ||
160 | spinlock_t lock; /* queue lock */ | |
161 | ||
162 | struct rbd_image_header header; | |
0bed54dc AE |
163 | char *image_name; |
164 | size_t image_name_len; | |
165 | char *header_name; | |
d22f76e7 | 166 | char *pool_name; |
9bb2f334 | 167 | int pool_id; |
602adf40 | 168 | |
59c2be1e YS |
169 | struct ceph_osd_event *watch_event; |
170 | struct ceph_osd_request *watch_request; | |
171 | ||
c666601a JD |
172 | /* protects updating the header */ |
173 | struct rw_semaphore header_rwsem; | |
e88a36ec | 174 | /* name of the snapshot this device reads from */ |
820a5f3e | 175 | char *snap_name; |
e88a36ec | 176 | /* id of the snapshot this device reads from */ |
77dfe99f | 177 | u64 snap_id; /* current snapshot id */ |
e88a36ec JD |
178 | /* whether the snap_id this device reads from still exists */ |
179 | bool snap_exists; | |
180 | int read_only; | |
602adf40 YS |
181 | |
182 | struct list_head node; | |
dfc5606d YS |
183 | |
184 | /* list of snapshots */ | |
185 | struct list_head snaps; | |
186 | ||
187 | /* sysfs related */ | |
188 | struct device dev; | |
189 | }; | |
190 | ||
602adf40 | 191 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 192 | |
602adf40 | 193 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
194 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
195 | ||
432b8587 AE |
196 | static LIST_HEAD(rbd_client_list); /* clients */ |
197 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 198 | |
dfc5606d YS |
199 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
200 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
201 | static ssize_t rbd_snap_add(struct device *dev, |
202 | struct device_attribute *attr, | |
203 | const char *buf, | |
204 | size_t count); | |
14e7085d | 205 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 206 | |
f0f8cef5 AE |
207 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
208 | size_t count); | |
209 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
210 | size_t count); | |
211 | ||
212 | static struct bus_attribute rbd_bus_attrs[] = { | |
213 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
214 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
215 | __ATTR_NULL | |
216 | }; | |
217 | ||
218 | static struct bus_type rbd_bus_type = { | |
219 | .name = "rbd", | |
220 | .bus_attrs = rbd_bus_attrs, | |
221 | }; | |
222 | ||
223 | static void rbd_root_dev_release(struct device *dev) | |
224 | { | |
225 | } | |
226 | ||
227 | static struct device rbd_root_dev = { | |
228 | .init_name = "rbd", | |
229 | .release = rbd_root_dev_release, | |
230 | }; | |
231 | ||
dfc5606d | 232 | |
dfc5606d YS |
233 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
234 | { | |
235 | return get_device(&rbd_dev->dev); | |
236 | } | |
237 | ||
238 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
239 | { | |
240 | put_device(&rbd_dev->dev); | |
241 | } | |
602adf40 | 242 | |
1fe5e993 | 243 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 244 | |
602adf40 YS |
245 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
246 | { | |
f0f8cef5 | 247 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 248 | |
602adf40 YS |
249 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
250 | return -EROFS; | |
251 | ||
340c7a2b AE |
252 | rbd_get_dev(rbd_dev); |
253 | set_device_ro(bdev, rbd_dev->read_only); | |
254 | ||
602adf40 YS |
255 | return 0; |
256 | } | |
257 | ||
dfc5606d YS |
258 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
259 | { | |
260 | struct rbd_device *rbd_dev = disk->private_data; | |
261 | ||
262 | rbd_put_dev(rbd_dev); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
602adf40 YS |
267 | static const struct block_device_operations rbd_bd_ops = { |
268 | .owner = THIS_MODULE, | |
269 | .open = rbd_open, | |
dfc5606d | 270 | .release = rbd_release, |
602adf40 YS |
271 | }; |
272 | ||
273 | /* | |
274 | * Initialize an rbd client instance. | |
43ae4701 | 275 | * We own *ceph_opts. |
602adf40 | 276 | */ |
43ae4701 | 277 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts, |
59c2be1e | 278 | struct rbd_options *rbd_opts) |
602adf40 YS |
279 | { |
280 | struct rbd_client *rbdc; | |
281 | int ret = -ENOMEM; | |
282 | ||
283 | dout("rbd_client_create\n"); | |
284 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
285 | if (!rbdc) | |
286 | goto out_opt; | |
287 | ||
288 | kref_init(&rbdc->kref); | |
289 | INIT_LIST_HEAD(&rbdc->node); | |
290 | ||
bc534d86 AE |
291 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
292 | ||
43ae4701 | 293 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 294 | if (IS_ERR(rbdc->client)) |
bc534d86 | 295 | goto out_mutex; |
43ae4701 | 296 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
297 | |
298 | ret = ceph_open_session(rbdc->client); | |
299 | if (ret < 0) | |
300 | goto out_err; | |
301 | ||
59c2be1e YS |
302 | rbdc->rbd_opts = rbd_opts; |
303 | ||
432b8587 | 304 | spin_lock(&rbd_client_list_lock); |
602adf40 | 305 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 306 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 307 | |
bc534d86 AE |
308 | mutex_unlock(&ctl_mutex); |
309 | ||
602adf40 YS |
310 | dout("rbd_client_create created %p\n", rbdc); |
311 | return rbdc; | |
312 | ||
313 | out_err: | |
314 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
315 | out_mutex: |
316 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
317 | kfree(rbdc); |
318 | out_opt: | |
43ae4701 AE |
319 | if (ceph_opts) |
320 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 321 | return ERR_PTR(ret); |
602adf40 YS |
322 | } |
323 | ||
324 | /* | |
325 | * Find a ceph client with specific addr and configuration. | |
326 | */ | |
43ae4701 | 327 | static struct rbd_client *__rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
328 | { |
329 | struct rbd_client *client_node; | |
330 | ||
43ae4701 | 331 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
332 | return NULL; |
333 | ||
334 | list_for_each_entry(client_node, &rbd_client_list, node) | |
43ae4701 | 335 | if (!ceph_compare_options(ceph_opts, client_node->client)) |
602adf40 YS |
336 | return client_node; |
337 | return NULL; | |
338 | } | |
339 | ||
59c2be1e YS |
340 | /* |
341 | * mount options | |
342 | */ | |
343 | enum { | |
344 | Opt_notify_timeout, | |
345 | Opt_last_int, | |
346 | /* int args above */ | |
347 | Opt_last_string, | |
348 | /* string args above */ | |
349 | }; | |
350 | ||
43ae4701 | 351 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
352 | {Opt_notify_timeout, "notify_timeout=%d"}, |
353 | /* int args above */ | |
354 | /* string args above */ | |
355 | {-1, NULL} | |
356 | }; | |
357 | ||
358 | static int parse_rbd_opts_token(char *c, void *private) | |
359 | { | |
43ae4701 | 360 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
361 | substring_t argstr[MAX_OPT_ARGS]; |
362 | int token, intval, ret; | |
363 | ||
43ae4701 | 364 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
365 | if (token < 0) |
366 | return -EINVAL; | |
367 | ||
368 | if (token < Opt_last_int) { | |
369 | ret = match_int(&argstr[0], &intval); | |
370 | if (ret < 0) { | |
371 | pr_err("bad mount option arg (not int) " | |
372 | "at '%s'\n", c); | |
373 | return ret; | |
374 | } | |
375 | dout("got int token %d val %d\n", token, intval); | |
376 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
377 | dout("got string token %d val %s\n", token, | |
378 | argstr[0].from); | |
379 | } else { | |
380 | dout("got token %d\n", token); | |
381 | } | |
382 | ||
383 | switch (token) { | |
384 | case Opt_notify_timeout: | |
43ae4701 | 385 | rbd_opts->notify_timeout = intval; |
59c2be1e YS |
386 | break; |
387 | default: | |
388 | BUG_ON(token); | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
602adf40 YS |
393 | /* |
394 | * Get a ceph client with specific addr and configuration, if one does | |
395 | * not exist create it. | |
396 | */ | |
5214ecc4 AE |
397 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
398 | size_t mon_addr_len, | |
399 | char *options) | |
602adf40 YS |
400 | { |
401 | struct rbd_client *rbdc; | |
43ae4701 | 402 | struct ceph_options *ceph_opts; |
59c2be1e YS |
403 | struct rbd_options *rbd_opts; |
404 | ||
405 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
406 | if (!rbd_opts) | |
d720bcb0 | 407 | return ERR_PTR(-ENOMEM); |
59c2be1e YS |
408 | |
409 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 | 410 | |
43ae4701 AE |
411 | ceph_opts = ceph_parse_options(options, mon_addr, |
412 | mon_addr + mon_addr_len, | |
413 | parse_rbd_opts_token, rbd_opts); | |
414 | if (IS_ERR(ceph_opts)) { | |
d720bcb0 | 415 | kfree(rbd_opts); |
43ae4701 | 416 | return ERR_CAST(ceph_opts); |
ee57741c | 417 | } |
602adf40 | 418 | |
432b8587 | 419 | spin_lock(&rbd_client_list_lock); |
43ae4701 | 420 | rbdc = __rbd_client_find(ceph_opts); |
602adf40 | 421 | if (rbdc) { |
602adf40 YS |
422 | /* using an existing client */ |
423 | kref_get(&rbdc->kref); | |
432b8587 | 424 | spin_unlock(&rbd_client_list_lock); |
e6994d3d | 425 | |
43ae4701 | 426 | ceph_destroy_options(ceph_opts); |
e6994d3d AE |
427 | kfree(rbd_opts); |
428 | ||
d720bcb0 | 429 | return rbdc; |
602adf40 | 430 | } |
432b8587 | 431 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 432 | |
43ae4701 | 433 | rbdc = rbd_client_create(ceph_opts, rbd_opts); |
d97081b0 | 434 | |
d720bcb0 AE |
435 | if (IS_ERR(rbdc)) |
436 | kfree(rbd_opts); | |
602adf40 | 437 | |
d720bcb0 | 438 | return rbdc; |
602adf40 YS |
439 | } |
440 | ||
441 | /* | |
442 | * Destroy ceph client | |
d23a4b3f | 443 | * |
432b8587 | 444 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
445 | */ |
446 | static void rbd_client_release(struct kref *kref) | |
447 | { | |
448 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
449 | ||
450 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 451 | spin_lock(&rbd_client_list_lock); |
602adf40 | 452 | list_del(&rbdc->node); |
cd9d9f5d | 453 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
454 | |
455 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 456 | kfree(rbdc->rbd_opts); |
602adf40 YS |
457 | kfree(rbdc); |
458 | } | |
459 | ||
460 | /* | |
461 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
462 | * it. | |
463 | */ | |
464 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
465 | { | |
466 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
467 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
468 | } |
469 | ||
1fec7093 YS |
470 | /* |
471 | * Destroy requests collection | |
472 | */ | |
473 | static void rbd_coll_release(struct kref *kref) | |
474 | { | |
475 | struct rbd_req_coll *coll = | |
476 | container_of(kref, struct rbd_req_coll, kref); | |
477 | ||
478 | dout("rbd_coll_release %p\n", coll); | |
479 | kfree(coll); | |
480 | } | |
602adf40 | 481 | |
8e94af8e AE |
482 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
483 | { | |
484 | return !memcmp(&ondisk->text, | |
485 | RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)); | |
486 | } | |
487 | ||
602adf40 YS |
488 | /* |
489 | * Create a new header structure, translate header format from the on-disk | |
490 | * header. | |
491 | */ | |
492 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
493 | struct rbd_image_header_ondisk *ondisk, | |
ed63f4fd | 494 | u32 allocated_snaps) |
602adf40 | 495 | { |
ccece235 | 496 | u32 snap_count; |
d2bb24e5 | 497 | size_t size; |
602adf40 | 498 | |
8e94af8e | 499 | if (!rbd_dev_ondisk_valid(ondisk)) |
81e759fb | 500 | return -ENXIO; |
81e759fb | 501 | |
00f1f36f | 502 | snap_count = le32_to_cpu(ondisk->snap_count); |
d2bb24e5 AE |
503 | |
504 | /* Make sure we don't overflow below */ | |
505 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
506 | if (snap_count > size / sizeof (header->snapc->snaps[0])) | |
50f7c4c9 | 507 | return -EINVAL; |
d2bb24e5 | 508 | |
6a52325f AE |
509 | memset(header, 0, sizeof (*header)); |
510 | ||
511 | size = sizeof (ondisk->block_name) + 1; | |
512 | header->object_prefix = kmalloc(size, GFP_KERNEL); | |
513 | if (!header->object_prefix) | |
602adf40 | 514 | return -ENOMEM; |
6a52325f AE |
515 | memcpy(header->object_prefix, ondisk->block_name, size - 1); |
516 | header->object_prefix[size - 1] = '\0'; | |
00f1f36f | 517 | |
602adf40 | 518 | if (snap_count) { |
ccece235 | 519 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
0f1d3f93 | 520 | BUG_ON(header->snap_names_len > (u64) SIZE_MAX); |
602adf40 | 521 | header->snap_names = kmalloc(header->snap_names_len, |
ed63f4fd | 522 | GFP_KERNEL); |
602adf40 | 523 | if (!header->snap_names) |
6a52325f AE |
524 | goto out_err; |
525 | ||
d2bb24e5 AE |
526 | size = snap_count * sizeof (*header->snap_sizes); |
527 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 528 | if (!header->snap_sizes) |
6a52325f | 529 | goto out_err; |
602adf40 | 530 | } else { |
ccece235 AE |
531 | WARN_ON(ondisk->snap_names_len); |
532 | header->snap_names_len = 0; | |
602adf40 YS |
533 | header->snap_names = NULL; |
534 | header->snap_sizes = NULL; | |
535 | } | |
849b4260 | 536 | |
602adf40 YS |
537 | header->image_size = le64_to_cpu(ondisk->image_size); |
538 | header->obj_order = ondisk->options.order; | |
539 | header->crypt_type = ondisk->options.crypt_type; | |
540 | header->comp_type = ondisk->options.comp_type; | |
6a52325f AE |
541 | header->total_snaps = snap_count; |
542 | ||
28cb775d AE |
543 | /* |
544 | * If the number of snapshot ids provided by the caller | |
545 | * doesn't match the number in the entire context there's | |
546 | * no point in going further. Caller will try again after | |
547 | * getting an updated snapshot context from the server. | |
548 | */ | |
549 | if (allocated_snaps != snap_count) | |
550 | return 0; | |
6a52325f AE |
551 | |
552 | size = sizeof (struct ceph_snap_context); | |
553 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
554 | header->snapc = kzalloc(size, GFP_KERNEL); | |
555 | if (!header->snapc) | |
556 | goto out_err; | |
602adf40 YS |
557 | |
558 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 559 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 560 | header->snapc->num_snaps = snap_count; |
602adf40 | 561 | |
28cb775d AE |
562 | /* Fill in the snapshot information */ |
563 | ||
564 | if (snap_count) { | |
565 | u32 i; | |
ccece235 | 566 | |
602adf40 YS |
567 | for (i = 0; i < snap_count; i++) { |
568 | header->snapc->snaps[i] = | |
569 | le64_to_cpu(ondisk->snaps[i].id); | |
570 | header->snap_sizes[i] = | |
571 | le64_to_cpu(ondisk->snaps[i].image_size); | |
572 | } | |
573 | ||
574 | /* copy snapshot names */ | |
ccece235 | 575 | memcpy(header->snap_names, &ondisk->snaps[snap_count], |
602adf40 YS |
576 | header->snap_names_len); |
577 | } | |
578 | ||
579 | return 0; | |
580 | ||
6a52325f | 581 | out_err: |
849b4260 | 582 | kfree(header->snap_sizes); |
ccece235 | 583 | header->snap_sizes = NULL; |
602adf40 | 584 | kfree(header->snap_names); |
ccece235 | 585 | header->snap_names = NULL; |
d78fd7ae | 586 | header->snap_names_len = 0; |
6a52325f AE |
587 | kfree(header->object_prefix); |
588 | header->object_prefix = NULL; | |
ccece235 | 589 | |
00f1f36f | 590 | return -ENOMEM; |
602adf40 YS |
591 | } |
592 | ||
602adf40 YS |
593 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
594 | u64 *seq, u64 *size) | |
595 | { | |
596 | int i; | |
597 | char *p = header->snap_names; | |
598 | ||
00f1f36f AE |
599 | for (i = 0; i < header->total_snaps; i++) { |
600 | if (!strcmp(snap_name, p)) { | |
602adf40 | 601 | |
00f1f36f | 602 | /* Found it. Pass back its id and/or size */ |
602adf40 | 603 | |
00f1f36f AE |
604 | if (seq) |
605 | *seq = header->snapc->snaps[i]; | |
606 | if (size) | |
607 | *size = header->snap_sizes[i]; | |
608 | return i; | |
609 | } | |
610 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
611 | } | |
612 | return -ENOENT; | |
602adf40 YS |
613 | } |
614 | ||
0ce1a794 | 615 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 616 | { |
78dc447d | 617 | int ret; |
602adf40 | 618 | |
0ce1a794 | 619 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 620 | |
0ce1a794 | 621 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 622 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0ce1a794 | 623 | rbd_dev->snap_id = CEPH_NOSNAP; |
e88a36ec | 624 | rbd_dev->snap_exists = false; |
0ce1a794 | 625 | rbd_dev->read_only = 0; |
602adf40 | 626 | if (size) |
78dc447d | 627 | *size = rbd_dev->header.image_size; |
602adf40 | 628 | } else { |
78dc447d AE |
629 | u64 snap_id = 0; |
630 | ||
631 | ret = snap_by_name(&rbd_dev->header, rbd_dev->snap_name, | |
632 | &snap_id, size); | |
602adf40 YS |
633 | if (ret < 0) |
634 | goto done; | |
78dc447d | 635 | rbd_dev->snap_id = snap_id; |
e88a36ec | 636 | rbd_dev->snap_exists = true; |
0ce1a794 | 637 | rbd_dev->read_only = 1; |
602adf40 YS |
638 | } |
639 | ||
640 | ret = 0; | |
641 | done: | |
0ce1a794 | 642 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
643 | return ret; |
644 | } | |
645 | ||
646 | static void rbd_header_free(struct rbd_image_header *header) | |
647 | { | |
849b4260 | 648 | kfree(header->object_prefix); |
d78fd7ae | 649 | header->object_prefix = NULL; |
602adf40 | 650 | kfree(header->snap_sizes); |
d78fd7ae | 651 | header->snap_sizes = NULL; |
849b4260 | 652 | kfree(header->snap_names); |
d78fd7ae AE |
653 | header->snap_names = NULL; |
654 | header->snap_names_len = 0; | |
d1d25646 | 655 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 656 | header->snapc = NULL; |
602adf40 YS |
657 | } |
658 | ||
659 | /* | |
660 | * get the actual striped segment name, offset and length | |
661 | */ | |
662 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 663 | const char *object_prefix, |
602adf40 YS |
664 | u64 ofs, u64 len, |
665 | char *seg_name, u64 *segofs) | |
666 | { | |
667 | u64 seg = ofs >> header->obj_order; | |
668 | ||
669 | if (seg_name) | |
670 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 671 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
672 | |
673 | ofs = ofs & ((1 << header->obj_order) - 1); | |
674 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
675 | ||
676 | if (segofs) | |
677 | *segofs = ofs; | |
678 | ||
679 | return len; | |
680 | } | |
681 | ||
1fec7093 YS |
682 | static int rbd_get_num_segments(struct rbd_image_header *header, |
683 | u64 ofs, u64 len) | |
684 | { | |
685 | u64 start_seg = ofs >> header->obj_order; | |
686 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
687 | return end_seg - start_seg + 1; | |
688 | } | |
689 | ||
029bcbd8 JD |
690 | /* |
691 | * returns the size of an object in the image | |
692 | */ | |
693 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
694 | { | |
695 | return 1 << header->obj_order; | |
696 | } | |
697 | ||
602adf40 YS |
698 | /* |
699 | * bio helpers | |
700 | */ | |
701 | ||
702 | static void bio_chain_put(struct bio *chain) | |
703 | { | |
704 | struct bio *tmp; | |
705 | ||
706 | while (chain) { | |
707 | tmp = chain; | |
708 | chain = chain->bi_next; | |
709 | bio_put(tmp); | |
710 | } | |
711 | } | |
712 | ||
713 | /* | |
714 | * zeros a bio chain, starting at specific offset | |
715 | */ | |
716 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
717 | { | |
718 | struct bio_vec *bv; | |
719 | unsigned long flags; | |
720 | void *buf; | |
721 | int i; | |
722 | int pos = 0; | |
723 | ||
724 | while (chain) { | |
725 | bio_for_each_segment(bv, chain, i) { | |
726 | if (pos + bv->bv_len > start_ofs) { | |
727 | int remainder = max(start_ofs - pos, 0); | |
728 | buf = bvec_kmap_irq(bv, &flags); | |
729 | memset(buf + remainder, 0, | |
730 | bv->bv_len - remainder); | |
85b5aaa6 | 731 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
732 | } |
733 | pos += bv->bv_len; | |
734 | } | |
735 | ||
736 | chain = chain->bi_next; | |
737 | } | |
738 | } | |
739 | ||
740 | /* | |
741 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
742 | * might return a bio_pair that will need to be released. | |
743 | */ | |
744 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
745 | struct bio_pair **bp, | |
746 | int len, gfp_t gfpmask) | |
747 | { | |
748 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
749 | int total = 0; | |
750 | ||
751 | if (*bp) { | |
752 | bio_pair_release(*bp); | |
753 | *bp = NULL; | |
754 | } | |
755 | ||
756 | while (old_chain && (total < len)) { | |
757 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
758 | if (!tmp) | |
759 | goto err_out; | |
760 | ||
761 | if (total + old_chain->bi_size > len) { | |
762 | struct bio_pair *bp; | |
763 | ||
764 | /* | |
765 | * this split can only happen with a single paged bio, | |
766 | * split_bio will BUG_ON if this is not the case | |
767 | */ | |
768 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
769 | "bi_size=%u\n", |
770 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
771 | |
772 | /* split the bio. We'll release it either in the next | |
773 | call, or it will have to be released outside */ | |
593a9e7b | 774 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
775 | if (!bp) |
776 | goto err_out; | |
777 | ||
778 | __bio_clone(tmp, &bp->bio1); | |
779 | ||
780 | *next = &bp->bio2; | |
781 | } else { | |
782 | __bio_clone(tmp, old_chain); | |
783 | *next = old_chain->bi_next; | |
784 | } | |
785 | ||
786 | tmp->bi_bdev = NULL; | |
787 | gfpmask &= ~__GFP_WAIT; | |
788 | tmp->bi_next = NULL; | |
789 | ||
790 | if (!new_chain) { | |
791 | new_chain = tail = tmp; | |
792 | } else { | |
793 | tail->bi_next = tmp; | |
794 | tail = tmp; | |
795 | } | |
796 | old_chain = old_chain->bi_next; | |
797 | ||
798 | total += tmp->bi_size; | |
799 | } | |
800 | ||
801 | BUG_ON(total < len); | |
802 | ||
803 | if (tail) | |
804 | tail->bi_next = NULL; | |
805 | ||
806 | *old = old_chain; | |
807 | ||
808 | return new_chain; | |
809 | ||
810 | err_out: | |
811 | dout("bio_chain_clone with err\n"); | |
812 | bio_chain_put(new_chain); | |
813 | return NULL; | |
814 | } | |
815 | ||
816 | /* | |
817 | * helpers for osd request op vectors. | |
818 | */ | |
57cfc106 AE |
819 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
820 | int opcode, u32 payload_len) | |
602adf40 | 821 | { |
57cfc106 AE |
822 | struct ceph_osd_req_op *ops; |
823 | ||
824 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
825 | if (!ops) | |
826 | return NULL; | |
827 | ||
828 | ops[0].op = opcode; | |
829 | ||
602adf40 YS |
830 | /* |
831 | * op extent offset and length will be set later on | |
832 | * in calc_raw_layout() | |
833 | */ | |
57cfc106 AE |
834 | ops[0].payload_len = payload_len; |
835 | ||
836 | return ops; | |
602adf40 YS |
837 | } |
838 | ||
839 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
840 | { | |
841 | kfree(ops); | |
842 | } | |
843 | ||
1fec7093 YS |
844 | static void rbd_coll_end_req_index(struct request *rq, |
845 | struct rbd_req_coll *coll, | |
846 | int index, | |
847 | int ret, u64 len) | |
848 | { | |
849 | struct request_queue *q; | |
850 | int min, max, i; | |
851 | ||
bd919d45 AE |
852 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
853 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
854 | |
855 | if (!rq) | |
856 | return; | |
857 | ||
858 | if (!coll) { | |
859 | blk_end_request(rq, ret, len); | |
860 | return; | |
861 | } | |
862 | ||
863 | q = rq->q; | |
864 | ||
865 | spin_lock_irq(q->queue_lock); | |
866 | coll->status[index].done = 1; | |
867 | coll->status[index].rc = ret; | |
868 | coll->status[index].bytes = len; | |
869 | max = min = coll->num_done; | |
870 | while (max < coll->total && coll->status[max].done) | |
871 | max++; | |
872 | ||
873 | for (i = min; i<max; i++) { | |
874 | __blk_end_request(rq, coll->status[i].rc, | |
875 | coll->status[i].bytes); | |
876 | coll->num_done++; | |
877 | kref_put(&coll->kref, rbd_coll_release); | |
878 | } | |
879 | spin_unlock_irq(q->queue_lock); | |
880 | } | |
881 | ||
882 | static void rbd_coll_end_req(struct rbd_request *req, | |
883 | int ret, u64 len) | |
884 | { | |
885 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
886 | } | |
887 | ||
602adf40 YS |
888 | /* |
889 | * Send ceph osd request | |
890 | */ | |
891 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 892 | struct rbd_device *rbd_dev, |
602adf40 YS |
893 | struct ceph_snap_context *snapc, |
894 | u64 snapid, | |
aded07ea | 895 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
896 | struct bio *bio, |
897 | struct page **pages, | |
898 | int num_pages, | |
899 | int flags, | |
900 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
901 | struct rbd_req_coll *coll, |
902 | int coll_index, | |
602adf40 | 903 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
904 | struct ceph_msg *msg), |
905 | struct ceph_osd_request **linger_req, | |
906 | u64 *ver) | |
602adf40 YS |
907 | { |
908 | struct ceph_osd_request *req; | |
909 | struct ceph_file_layout *layout; | |
910 | int ret; | |
911 | u64 bno; | |
912 | struct timespec mtime = CURRENT_TIME; | |
913 | struct rbd_request *req_data; | |
914 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 915 | struct ceph_osd_client *osdc; |
602adf40 | 916 | |
602adf40 | 917 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
918 | if (!req_data) { |
919 | if (coll) | |
920 | rbd_coll_end_req_index(rq, coll, coll_index, | |
921 | -ENOMEM, len); | |
922 | return -ENOMEM; | |
923 | } | |
924 | ||
925 | if (coll) { | |
926 | req_data->coll = coll; | |
927 | req_data->coll_index = coll_index; | |
928 | } | |
602adf40 | 929 | |
bd919d45 AE |
930 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
931 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 932 | |
0ce1a794 | 933 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
934 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
935 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 936 | if (!req) { |
4ad12621 | 937 | ret = -ENOMEM; |
602adf40 YS |
938 | goto done_pages; |
939 | } | |
940 | ||
941 | req->r_callback = rbd_cb; | |
942 | ||
943 | req_data->rq = rq; | |
944 | req_data->bio = bio; | |
945 | req_data->pages = pages; | |
946 | req_data->len = len; | |
947 | ||
948 | req->r_priv = req_data; | |
949 | ||
950 | reqhead = req->r_request->front.iov_base; | |
951 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
952 | ||
aded07ea | 953 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
954 | req->r_oid_len = strlen(req->r_oid); |
955 | ||
956 | layout = &req->r_file_layout; | |
957 | memset(layout, 0, sizeof(*layout)); | |
958 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
959 | layout->fl_stripe_count = cpu_to_le32(1); | |
960 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 961 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
962 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
963 | req, ops); | |
602adf40 YS |
964 | |
965 | ceph_osdc_build_request(req, ofs, &len, | |
966 | ops, | |
967 | snapc, | |
968 | &mtime, | |
969 | req->r_oid, req->r_oid_len); | |
602adf40 | 970 | |
59c2be1e | 971 | if (linger_req) { |
1dbb4399 | 972 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
973 | *linger_req = req; |
974 | } | |
975 | ||
1dbb4399 | 976 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
977 | if (ret < 0) |
978 | goto done_err; | |
979 | ||
980 | if (!rbd_cb) { | |
1dbb4399 | 981 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
982 | if (ver) |
983 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
984 | dout("reassert_ver=%llu\n", |
985 | (unsigned long long) | |
986 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
987 | ceph_osdc_put_request(req); |
988 | } | |
989 | return ret; | |
990 | ||
991 | done_err: | |
992 | bio_chain_put(req_data->bio); | |
993 | ceph_osdc_put_request(req); | |
994 | done_pages: | |
1fec7093 | 995 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 996 | kfree(req_data); |
602adf40 YS |
997 | return ret; |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Ceph osd op callback | |
1002 | */ | |
1003 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1004 | { | |
1005 | struct rbd_request *req_data = req->r_priv; | |
1006 | struct ceph_osd_reply_head *replyhead; | |
1007 | struct ceph_osd_op *op; | |
1008 | __s32 rc; | |
1009 | u64 bytes; | |
1010 | int read_op; | |
1011 | ||
1012 | /* parse reply */ | |
1013 | replyhead = msg->front.iov_base; | |
1014 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1015 | op = (void *)(replyhead + 1); | |
1016 | rc = le32_to_cpu(replyhead->result); | |
1017 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1018 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1019 | |
bd919d45 AE |
1020 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1021 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1022 | |
1023 | if (rc == -ENOENT && read_op) { | |
1024 | zero_bio_chain(req_data->bio, 0); | |
1025 | rc = 0; | |
1026 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1027 | zero_bio_chain(req_data->bio, bytes); | |
1028 | bytes = req_data->len; | |
1029 | } | |
1030 | ||
1fec7093 | 1031 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1032 | |
1033 | if (req_data->bio) | |
1034 | bio_chain_put(req_data->bio); | |
1035 | ||
1036 | ceph_osdc_put_request(req); | |
1037 | kfree(req_data); | |
1038 | } | |
1039 | ||
59c2be1e YS |
1040 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1041 | { | |
1042 | ceph_osdc_put_request(req); | |
1043 | } | |
1044 | ||
602adf40 YS |
1045 | /* |
1046 | * Do a synchronous ceph osd operation | |
1047 | */ | |
0ce1a794 | 1048 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1049 | struct ceph_snap_context *snapc, |
1050 | u64 snapid, | |
602adf40 | 1051 | int flags, |
913d2fdc | 1052 | struct ceph_osd_req_op *ops, |
aded07ea | 1053 | const char *object_name, |
602adf40 | 1054 | u64 ofs, u64 len, |
59c2be1e YS |
1055 | char *buf, |
1056 | struct ceph_osd_request **linger_req, | |
1057 | u64 *ver) | |
602adf40 YS |
1058 | { |
1059 | int ret; | |
1060 | struct page **pages; | |
1061 | int num_pages; | |
913d2fdc AE |
1062 | |
1063 | BUG_ON(ops == NULL); | |
602adf40 YS |
1064 | |
1065 | num_pages = calc_pages_for(ofs , len); | |
1066 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1067 | if (IS_ERR(pages)) |
1068 | return PTR_ERR(pages); | |
602adf40 | 1069 | |
0ce1a794 | 1070 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1071 | object_name, ofs, len, NULL, |
602adf40 YS |
1072 | pages, num_pages, |
1073 | flags, | |
1074 | ops, | |
1fec7093 | 1075 | NULL, 0, |
59c2be1e YS |
1076 | NULL, |
1077 | linger_req, ver); | |
602adf40 | 1078 | if (ret < 0) |
913d2fdc | 1079 | goto done; |
602adf40 YS |
1080 | |
1081 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1082 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1083 | ||
602adf40 YS |
1084 | done: |
1085 | ceph_release_page_vector(pages, num_pages); | |
1086 | return ret; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * Do an asynchronous ceph osd operation | |
1091 | */ | |
1092 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1093 | struct rbd_device *rbd_dev, |
602adf40 YS |
1094 | struct ceph_snap_context *snapc, |
1095 | u64 snapid, | |
d1f57ea6 | 1096 | int opcode, int flags, |
602adf40 | 1097 | u64 ofs, u64 len, |
1fec7093 YS |
1098 | struct bio *bio, |
1099 | struct rbd_req_coll *coll, | |
1100 | int coll_index) | |
602adf40 YS |
1101 | { |
1102 | char *seg_name; | |
1103 | u64 seg_ofs; | |
1104 | u64 seg_len; | |
1105 | int ret; | |
1106 | struct ceph_osd_req_op *ops; | |
1107 | u32 payload_len; | |
1108 | ||
1109 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1110 | if (!seg_name) | |
1111 | return -ENOMEM; | |
1112 | ||
1113 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1114 | rbd_dev->header.object_prefix, |
602adf40 YS |
1115 | ofs, len, |
1116 | seg_name, &seg_ofs); | |
602adf40 YS |
1117 | |
1118 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1119 | ||
57cfc106 AE |
1120 | ret = -ENOMEM; |
1121 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1122 | if (!ops) | |
602adf40 YS |
1123 | goto done; |
1124 | ||
1125 | /* we've taken care of segment sizes earlier when we | |
1126 | cloned the bios. We should never have a segment | |
1127 | truncated at this point */ | |
1128 | BUG_ON(seg_len < len); | |
1129 | ||
1130 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1131 | seg_name, seg_ofs, seg_len, | |
1132 | bio, | |
1133 | NULL, 0, | |
1134 | flags, | |
1135 | ops, | |
1fec7093 | 1136 | coll, coll_index, |
59c2be1e | 1137 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1138 | |
1139 | rbd_destroy_ops(ops); | |
602adf40 YS |
1140 | done: |
1141 | kfree(seg_name); | |
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Request async osd write | |
1147 | */ | |
1148 | static int rbd_req_write(struct request *rq, | |
1149 | struct rbd_device *rbd_dev, | |
1150 | struct ceph_snap_context *snapc, | |
1151 | u64 ofs, u64 len, | |
1fec7093 YS |
1152 | struct bio *bio, |
1153 | struct rbd_req_coll *coll, | |
1154 | int coll_index) | |
602adf40 YS |
1155 | { |
1156 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1157 | CEPH_OSD_OP_WRITE, | |
1158 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1159 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1160 | } |
1161 | ||
1162 | /* | |
1163 | * Request async osd read | |
1164 | */ | |
1165 | static int rbd_req_read(struct request *rq, | |
1166 | struct rbd_device *rbd_dev, | |
1167 | u64 snapid, | |
1168 | u64 ofs, u64 len, | |
1fec7093 YS |
1169 | struct bio *bio, |
1170 | struct rbd_req_coll *coll, | |
1171 | int coll_index) | |
602adf40 YS |
1172 | { |
1173 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1174 | snapid, |
602adf40 YS |
1175 | CEPH_OSD_OP_READ, |
1176 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1177 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1178 | } |
1179 | ||
1180 | /* | |
1181 | * Request sync osd read | |
1182 | */ | |
0ce1a794 | 1183 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1184 | u64 snapid, |
aded07ea | 1185 | const char *object_name, |
602adf40 | 1186 | u64 ofs, u64 len, |
59c2be1e YS |
1187 | char *buf, |
1188 | u64 *ver) | |
602adf40 | 1189 | { |
913d2fdc AE |
1190 | struct ceph_osd_req_op *ops; |
1191 | int ret; | |
1192 | ||
1193 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1194 | if (!ops) | |
1195 | return -ENOMEM; | |
1196 | ||
1197 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1198 | snapid, |
602adf40 | 1199 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1200 | ops, object_name, ofs, len, buf, NULL, ver); |
1201 | rbd_destroy_ops(ops); | |
1202 | ||
1203 | return ret; | |
602adf40 YS |
1204 | } |
1205 | ||
1206 | /* | |
59c2be1e YS |
1207 | * Request sync osd watch |
1208 | */ | |
0ce1a794 | 1209 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1210 | u64 ver, |
7f0a24d8 | 1211 | u64 notify_id) |
59c2be1e YS |
1212 | { |
1213 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1214 | int ret; |
1215 | ||
57cfc106 AE |
1216 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1217 | if (!ops) | |
1218 | return -ENOMEM; | |
59c2be1e | 1219 | |
a71b891b | 1220 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1221 | ops[0].watch.cookie = notify_id; |
1222 | ops[0].watch.flag = 0; | |
1223 | ||
0ce1a794 | 1224 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1225 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1226 | NULL, 0, |
59c2be1e YS |
1227 | CEPH_OSD_FLAG_READ, |
1228 | ops, | |
1fec7093 | 1229 | NULL, 0, |
59c2be1e YS |
1230 | rbd_simple_req_cb, 0, NULL); |
1231 | ||
1232 | rbd_destroy_ops(ops); | |
1233 | return ret; | |
1234 | } | |
1235 | ||
1236 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1237 | { | |
0ce1a794 | 1238 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1239 | u64 hver; |
13143d2d SW |
1240 | int rc; |
1241 | ||
0ce1a794 | 1242 | if (!rbd_dev) |
59c2be1e YS |
1243 | return; |
1244 | ||
bd919d45 AE |
1245 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1246 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1247 | (unsigned int) opcode); | |
1fe5e993 | 1248 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1249 | if (rc) |
f0f8cef5 | 1250 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1251 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1252 | |
7f0a24d8 | 1253 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * Request sync osd watch | |
1258 | */ | |
0e6f322d | 1259 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1260 | { |
1261 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1262 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1263 | int ret; |
59c2be1e | 1264 | |
57cfc106 AE |
1265 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1266 | if (!ops) | |
1267 | return -ENOMEM; | |
59c2be1e YS |
1268 | |
1269 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1270 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1271 | if (ret < 0) |
1272 | goto fail; | |
1273 | ||
0e6f322d | 1274 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1275 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1276 | ops[0].watch.flag = 1; |
1277 | ||
0ce1a794 | 1278 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1279 | CEPH_NOSNAP, |
59c2be1e YS |
1280 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1281 | ops, | |
0e6f322d AE |
1282 | rbd_dev->header_name, |
1283 | 0, 0, NULL, | |
0ce1a794 | 1284 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1285 | |
1286 | if (ret < 0) | |
1287 | goto fail_event; | |
1288 | ||
1289 | rbd_destroy_ops(ops); | |
1290 | return 0; | |
1291 | ||
1292 | fail_event: | |
0ce1a794 AE |
1293 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1294 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1295 | fail: |
1296 | rbd_destroy_ops(ops); | |
1297 | return ret; | |
1298 | } | |
1299 | ||
79e3057c YS |
1300 | /* |
1301 | * Request sync osd unwatch | |
1302 | */ | |
070c633f | 1303 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1304 | { |
1305 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1306 | int ret; |
79e3057c | 1307 | |
57cfc106 AE |
1308 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1309 | if (!ops) | |
1310 | return -ENOMEM; | |
79e3057c YS |
1311 | |
1312 | ops[0].watch.ver = 0; | |
0ce1a794 | 1313 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1314 | ops[0].watch.flag = 0; |
1315 | ||
0ce1a794 | 1316 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1317 | CEPH_NOSNAP, |
79e3057c YS |
1318 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1319 | ops, | |
070c633f AE |
1320 | rbd_dev->header_name, |
1321 | 0, 0, NULL, NULL, NULL); | |
1322 | ||
79e3057c YS |
1323 | |
1324 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1325 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1326 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1327 | return ret; |
1328 | } | |
1329 | ||
59c2be1e | 1330 | struct rbd_notify_info { |
0ce1a794 | 1331 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1332 | }; |
1333 | ||
1334 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1335 | { | |
0ce1a794 AE |
1336 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1337 | if (!rbd_dev) | |
59c2be1e YS |
1338 | return; |
1339 | ||
bd919d45 AE |
1340 | dout("rbd_notify_cb %s notify_id=%llu opcode=%u\n", |
1341 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1342 | (unsigned int) opcode); | |
59c2be1e YS |
1343 | } |
1344 | ||
1345 | /* | |
1346 | * Request sync osd notify | |
1347 | */ | |
4cb16250 | 1348 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev) |
59c2be1e YS |
1349 | { |
1350 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1351 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1352 | struct ceph_osd_event *event; |
1353 | struct rbd_notify_info info; | |
1354 | int payload_len = sizeof(u32) + sizeof(u32); | |
1355 | int ret; | |
1356 | ||
57cfc106 AE |
1357 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len); |
1358 | if (!ops) | |
1359 | return -ENOMEM; | |
59c2be1e | 1360 | |
0ce1a794 | 1361 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1362 | |
1363 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1364 | (void *)&info, &event); | |
1365 | if (ret < 0) | |
1366 | goto fail; | |
1367 | ||
1368 | ops[0].watch.ver = 1; | |
1369 | ops[0].watch.flag = 1; | |
1370 | ops[0].watch.cookie = event->cookie; | |
1371 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1372 | ops[0].watch.timeout = 12; | |
1373 | ||
0ce1a794 | 1374 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1375 | CEPH_NOSNAP, |
59c2be1e YS |
1376 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1377 | ops, | |
4cb16250 AE |
1378 | rbd_dev->header_name, |
1379 | 0, 0, NULL, NULL, NULL); | |
59c2be1e YS |
1380 | if (ret < 0) |
1381 | goto fail_event; | |
1382 | ||
1383 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1384 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1385 | rbd_destroy_ops(ops); | |
1386 | return 0; | |
1387 | ||
1388 | fail_event: | |
1389 | ceph_osdc_cancel_event(event); | |
1390 | fail: | |
1391 | rbd_destroy_ops(ops); | |
1392 | return ret; | |
1393 | } | |
1394 | ||
602adf40 YS |
1395 | /* |
1396 | * Request sync osd read | |
1397 | */ | |
0ce1a794 | 1398 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1399 | const char *object_name, |
1400 | const char *class_name, | |
1401 | const char *method_name, | |
602adf40 | 1402 | const char *data, |
59c2be1e YS |
1403 | int len, |
1404 | u64 *ver) | |
602adf40 YS |
1405 | { |
1406 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1407 | int class_name_len = strlen(class_name); |
1408 | int method_name_len = strlen(method_name); | |
57cfc106 AE |
1409 | int ret; |
1410 | ||
1411 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, | |
aded07ea | 1412 | class_name_len + method_name_len + len); |
57cfc106 AE |
1413 | if (!ops) |
1414 | return -ENOMEM; | |
602adf40 | 1415 | |
aded07ea AE |
1416 | ops[0].cls.class_name = class_name; |
1417 | ops[0].cls.class_len = (__u8) class_name_len; | |
1418 | ops[0].cls.method_name = method_name; | |
1419 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 YS |
1420 | ops[0].cls.argc = 0; |
1421 | ops[0].cls.indata = data; | |
1422 | ops[0].cls.indata_len = len; | |
1423 | ||
0ce1a794 | 1424 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1425 | CEPH_NOSNAP, |
602adf40 YS |
1426 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1427 | ops, | |
d1f57ea6 | 1428 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1429 | |
1430 | rbd_destroy_ops(ops); | |
1431 | ||
1432 | dout("cls_exec returned %d\n", ret); | |
1433 | return ret; | |
1434 | } | |
1435 | ||
1fec7093 YS |
1436 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1437 | { | |
1438 | struct rbd_req_coll *coll = | |
1439 | kzalloc(sizeof(struct rbd_req_coll) + | |
1440 | sizeof(struct rbd_req_status) * num_reqs, | |
1441 | GFP_ATOMIC); | |
1442 | ||
1443 | if (!coll) | |
1444 | return NULL; | |
1445 | coll->total = num_reqs; | |
1446 | kref_init(&coll->kref); | |
1447 | return coll; | |
1448 | } | |
1449 | ||
602adf40 YS |
1450 | /* |
1451 | * block device queue callback | |
1452 | */ | |
1453 | static void rbd_rq_fn(struct request_queue *q) | |
1454 | { | |
1455 | struct rbd_device *rbd_dev = q->queuedata; | |
1456 | struct request *rq; | |
1457 | struct bio_pair *bp = NULL; | |
1458 | ||
00f1f36f | 1459 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1460 | struct bio *bio; |
1461 | struct bio *rq_bio, *next_bio = NULL; | |
1462 | bool do_write; | |
bd919d45 AE |
1463 | unsigned int size; |
1464 | u64 op_size = 0; | |
602adf40 | 1465 | u64 ofs; |
1fec7093 YS |
1466 | int num_segs, cur_seg = 0; |
1467 | struct rbd_req_coll *coll; | |
d1d25646 | 1468 | struct ceph_snap_context *snapc; |
602adf40 YS |
1469 | |
1470 | /* peek at request from block layer */ | |
1471 | if (!rq) | |
1472 | break; | |
1473 | ||
1474 | dout("fetched request\n"); | |
1475 | ||
1476 | /* filter out block requests we don't understand */ | |
1477 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1478 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1479 | continue; |
602adf40 YS |
1480 | } |
1481 | ||
1482 | /* deduce our operation (read, write) */ | |
1483 | do_write = (rq_data_dir(rq) == WRITE); | |
1484 | ||
1485 | size = blk_rq_bytes(rq); | |
593a9e7b | 1486 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 YS |
1487 | rq_bio = rq->bio; |
1488 | if (do_write && rbd_dev->read_only) { | |
1489 | __blk_end_request_all(rq, -EROFS); | |
00f1f36f | 1490 | continue; |
602adf40 YS |
1491 | } |
1492 | ||
1493 | spin_unlock_irq(q->queue_lock); | |
1494 | ||
d1d25646 | 1495 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1496 | |
d1d25646 | 1497 | if (rbd_dev->snap_id != CEPH_NOSNAP && !rbd_dev->snap_exists) { |
e88a36ec | 1498 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1499 | dout("request for non-existent snapshot"); |
1500 | spin_lock_irq(q->queue_lock); | |
1501 | __blk_end_request_all(rq, -ENXIO); | |
1502 | continue; | |
e88a36ec JD |
1503 | } |
1504 | ||
d1d25646 JD |
1505 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1506 | ||
1507 | up_read(&rbd_dev->header_rwsem); | |
1508 | ||
602adf40 YS |
1509 | dout("%s 0x%x bytes at 0x%llx\n", |
1510 | do_write ? "write" : "read", | |
bd919d45 | 1511 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1512 | |
1fec7093 YS |
1513 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1514 | coll = rbd_alloc_coll(num_segs); | |
1515 | if (!coll) { | |
1516 | spin_lock_irq(q->queue_lock); | |
1517 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1518 | ceph_put_snap_context(snapc); |
00f1f36f | 1519 | continue; |
1fec7093 YS |
1520 | } |
1521 | ||
602adf40 YS |
1522 | do { |
1523 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1524 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
602adf40 | 1525 | op_size = rbd_get_segment(&rbd_dev->header, |
ca1e49a6 | 1526 | rbd_dev->header.object_prefix, |
602adf40 YS |
1527 | ofs, size, |
1528 | NULL, NULL); | |
1fec7093 | 1529 | kref_get(&coll->kref); |
602adf40 YS |
1530 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1531 | op_size, GFP_ATOMIC); | |
1532 | if (!bio) { | |
1fec7093 YS |
1533 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1534 | -ENOMEM, op_size); | |
1535 | goto next_seg; | |
602adf40 YS |
1536 | } |
1537 | ||
1fec7093 | 1538 | |
602adf40 YS |
1539 | /* init OSD command: write or read */ |
1540 | if (do_write) | |
1541 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1542 | snapc, |
602adf40 | 1543 | ofs, |
1fec7093 YS |
1544 | op_size, bio, |
1545 | coll, cur_seg); | |
602adf40 YS |
1546 | else |
1547 | rbd_req_read(rq, rbd_dev, | |
77dfe99f | 1548 | rbd_dev->snap_id, |
602adf40 | 1549 | ofs, |
1fec7093 YS |
1550 | op_size, bio, |
1551 | coll, cur_seg); | |
602adf40 | 1552 | |
1fec7093 | 1553 | next_seg: |
602adf40 YS |
1554 | size -= op_size; |
1555 | ofs += op_size; | |
1556 | ||
1fec7093 | 1557 | cur_seg++; |
602adf40 YS |
1558 | rq_bio = next_bio; |
1559 | } while (size > 0); | |
1fec7093 | 1560 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1561 | |
1562 | if (bp) | |
1563 | bio_pair_release(bp); | |
602adf40 | 1564 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1565 | |
1566 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1567 | } |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1572 | * multiple osd objects. One exception would be with a single page bios, | |
1573 | * which we handle later at bio_chain_clone | |
1574 | */ | |
1575 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1576 | struct bio_vec *bvec) | |
1577 | { | |
1578 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1579 | unsigned int chunk_sectors; |
1580 | sector_t sector; | |
1581 | unsigned int bio_sectors; | |
602adf40 YS |
1582 | int max; |
1583 | ||
593a9e7b AE |
1584 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1585 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1586 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1587 | ||
602adf40 | 1588 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1589 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1590 | if (max < 0) |
1591 | max = 0; /* bio_add cannot handle a negative return */ | |
1592 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1593 | return bvec->bv_len; | |
1594 | return max; | |
1595 | } | |
1596 | ||
1597 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1598 | { | |
1599 | struct gendisk *disk = rbd_dev->disk; | |
1600 | ||
1601 | if (!disk) | |
1602 | return; | |
1603 | ||
1604 | rbd_header_free(&rbd_dev->header); | |
1605 | ||
1606 | if (disk->flags & GENHD_FL_UP) | |
1607 | del_gendisk(disk); | |
1608 | if (disk->queue) | |
1609 | blk_cleanup_queue(disk->queue); | |
1610 | put_disk(disk); | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * reload the ondisk the header | |
1615 | */ | |
1616 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1617 | struct rbd_image_header *header) | |
1618 | { | |
1619 | ssize_t rc; | |
1620 | struct rbd_image_header_ondisk *dh; | |
50f7c4c9 | 1621 | u32 snap_count = 0; |
59c2be1e | 1622 | u64 ver; |
00f1f36f | 1623 | size_t len; |
602adf40 | 1624 | |
00f1f36f AE |
1625 | /* |
1626 | * First reads the fixed-size header to determine the number | |
1627 | * of snapshots, then re-reads it, along with all snapshot | |
1628 | * records as well as their stored names. | |
1629 | */ | |
1630 | len = sizeof (*dh); | |
602adf40 | 1631 | while (1) { |
602adf40 YS |
1632 | dh = kmalloc(len, GFP_KERNEL); |
1633 | if (!dh) | |
1634 | return -ENOMEM; | |
1635 | ||
1636 | rc = rbd_req_sync_read(rbd_dev, | |
9a5d690b | 1637 | CEPH_NOSNAP, |
0bed54dc | 1638 | rbd_dev->header_name, |
602adf40 | 1639 | 0, len, |
59c2be1e | 1640 | (char *)dh, &ver); |
602adf40 YS |
1641 | if (rc < 0) |
1642 | goto out_dh; | |
1643 | ||
ed63f4fd | 1644 | rc = rbd_header_from_disk(header, dh, snap_count); |
81e759fb | 1645 | if (rc < 0) { |
00f1f36f | 1646 | if (rc == -ENXIO) |
81e759fb | 1647 | pr_warning("unrecognized header format" |
0bed54dc AE |
1648 | " for image %s\n", |
1649 | rbd_dev->image_name); | |
602adf40 | 1650 | goto out_dh; |
81e759fb | 1651 | } |
602adf40 | 1652 | |
00f1f36f AE |
1653 | if (snap_count == header->total_snaps) |
1654 | break; | |
1655 | ||
1656 | snap_count = header->total_snaps; | |
1657 | len = sizeof (*dh) + | |
1658 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1659 | header->snap_names_len; | |
1660 | ||
1661 | rbd_header_free(header); | |
1662 | kfree(dh); | |
602adf40 | 1663 | } |
59c2be1e | 1664 | header->obj_version = ver; |
602adf40 YS |
1665 | |
1666 | out_dh: | |
1667 | kfree(dh); | |
1668 | return rc; | |
1669 | } | |
1670 | ||
1671 | /* | |
1672 | * create a snapshot | |
1673 | */ | |
0ce1a794 | 1674 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, |
602adf40 YS |
1675 | const char *snap_name, |
1676 | gfp_t gfp_flags) | |
1677 | { | |
1678 | int name_len = strlen(snap_name); | |
1679 | u64 new_snapid; | |
1680 | int ret; | |
916d4d67 | 1681 | void *data, *p, *e; |
1dbb4399 | 1682 | struct ceph_mon_client *monc; |
602adf40 YS |
1683 | |
1684 | /* we should create a snapshot only if we're pointing at the head */ | |
0ce1a794 | 1685 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1686 | return -EINVAL; |
1687 | ||
0ce1a794 AE |
1688 | monc = &rbd_dev->rbd_client->client->monc; |
1689 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
bd919d45 | 1690 | dout("created snapid=%llu\n", (unsigned long long) new_snapid); |
602adf40 YS |
1691 | if (ret < 0) |
1692 | return ret; | |
1693 | ||
1694 | data = kmalloc(name_len + 16, gfp_flags); | |
1695 | if (!data) | |
1696 | return -ENOMEM; | |
1697 | ||
916d4d67 SW |
1698 | p = data; |
1699 | e = data + name_len + 16; | |
602adf40 | 1700 | |
916d4d67 SW |
1701 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1702 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1703 | |
0bed54dc | 1704 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1705 | "rbd", "snap_add", |
d67d4be5 | 1706 | data, p - data, NULL); |
602adf40 | 1707 | |
916d4d67 | 1708 | kfree(data); |
602adf40 | 1709 | |
505cbb9b | 1710 | return ret < 0 ? ret : 0; |
602adf40 YS |
1711 | bad: |
1712 | return -ERANGE; | |
1713 | } | |
1714 | ||
dfc5606d YS |
1715 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1716 | { | |
1717 | struct rbd_snap *snap; | |
a0593290 | 1718 | struct rbd_snap *next; |
dfc5606d | 1719 | |
a0593290 | 1720 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1721 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1722 | } |
1723 | ||
602adf40 YS |
1724 | /* |
1725 | * only read the first part of the ondisk header, without the snaps info | |
1726 | */ | |
b813623a | 1727 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1728 | { |
1729 | int ret; | |
1730 | struct rbd_image_header h; | |
602adf40 YS |
1731 | |
1732 | ret = rbd_read_header(rbd_dev, &h); | |
1733 | if (ret < 0) | |
1734 | return ret; | |
1735 | ||
a51aa0c0 JD |
1736 | down_write(&rbd_dev->header_rwsem); |
1737 | ||
9db4b3e3 | 1738 | /* resized? */ |
474ef7ce JD |
1739 | if (rbd_dev->snap_id == CEPH_NOSNAP) { |
1740 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1741 | ||
1742 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1743 | set_capacity(rbd_dev->disk, size); | |
1744 | } | |
9db4b3e3 | 1745 | |
849b4260 | 1746 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1747 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1748 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1749 | /* osd requests may still refer to snapc */ |
1750 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1751 | |
b813623a AE |
1752 | if (hver) |
1753 | *hver = h.obj_version; | |
a71b891b | 1754 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1755 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1756 | rbd_dev->header.total_snaps = h.total_snaps; |
1757 | rbd_dev->header.snapc = h.snapc; | |
1758 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1759 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1760 | rbd_dev->header.snap_sizes = h.snap_sizes; |
849b4260 AE |
1761 | /* Free the extra copy of the object prefix */ |
1762 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1763 | kfree(h.object_prefix); | |
1764 | ||
dfc5606d YS |
1765 | ret = __rbd_init_snaps_header(rbd_dev); |
1766 | ||
c666601a | 1767 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1768 | |
dfc5606d | 1769 | return ret; |
602adf40 YS |
1770 | } |
1771 | ||
1fe5e993 AE |
1772 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1773 | { | |
1774 | int ret; | |
1775 | ||
1776 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1777 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1778 | mutex_unlock(&ctl_mutex); | |
1779 | ||
1780 | return ret; | |
1781 | } | |
1782 | ||
602adf40 YS |
1783 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1784 | { | |
1785 | struct gendisk *disk; | |
1786 | struct request_queue *q; | |
1787 | int rc; | |
593a9e7b | 1788 | u64 segment_size; |
602adf40 YS |
1789 | u64 total_size = 0; |
1790 | ||
1791 | /* contact OSD, request size info about the object being mapped */ | |
1792 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1793 | if (rc) | |
1794 | return rc; | |
1795 | ||
dfc5606d YS |
1796 | /* no need to lock here, as rbd_dev is not registered yet */ |
1797 | rc = __rbd_init_snaps_header(rbd_dev); | |
1798 | if (rc) | |
1799 | return rc; | |
1800 | ||
cc9d734c | 1801 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1802 | if (rc) |
1803 | return rc; | |
1804 | ||
1805 | /* create gendisk info */ | |
1806 | rc = -ENOMEM; | |
1807 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1808 | if (!disk) | |
1809 | goto out; | |
1810 | ||
f0f8cef5 | 1811 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1812 | rbd_dev->dev_id); |
602adf40 YS |
1813 | disk->major = rbd_dev->major; |
1814 | disk->first_minor = 0; | |
1815 | disk->fops = &rbd_bd_ops; | |
1816 | disk->private_data = rbd_dev; | |
1817 | ||
1818 | /* init rq */ | |
1819 | rc = -ENOMEM; | |
1820 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1821 | if (!q) | |
1822 | goto out_disk; | |
029bcbd8 | 1823 | |
593a9e7b AE |
1824 | /* We use the default size, but let's be explicit about it. */ |
1825 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1826 | ||
029bcbd8 | 1827 | /* set io sizes to object size */ |
593a9e7b AE |
1828 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1829 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1830 | blk_queue_max_segment_size(q, segment_size); | |
1831 | blk_queue_io_min(q, segment_size); | |
1832 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1833 | |
602adf40 YS |
1834 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1835 | disk->queue = q; | |
1836 | ||
1837 | q->queuedata = rbd_dev; | |
1838 | ||
1839 | rbd_dev->disk = disk; | |
1840 | rbd_dev->q = q; | |
1841 | ||
1842 | /* finally, announce the disk to the world */ | |
593a9e7b | 1843 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1844 | add_disk(disk); |
1845 | ||
1846 | pr_info("%s: added with size 0x%llx\n", | |
1847 | disk->disk_name, (unsigned long long)total_size); | |
1848 | return 0; | |
1849 | ||
1850 | out_disk: | |
1851 | put_disk(disk); | |
1852 | out: | |
1853 | return rc; | |
1854 | } | |
1855 | ||
dfc5606d YS |
1856 | /* |
1857 | sysfs | |
1858 | */ | |
1859 | ||
593a9e7b AE |
1860 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1861 | { | |
1862 | return container_of(dev, struct rbd_device, dev); | |
1863 | } | |
1864 | ||
dfc5606d YS |
1865 | static ssize_t rbd_size_show(struct device *dev, |
1866 | struct device_attribute *attr, char *buf) | |
1867 | { | |
593a9e7b | 1868 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1869 | sector_t size; |
1870 | ||
1871 | down_read(&rbd_dev->header_rwsem); | |
1872 | size = get_capacity(rbd_dev->disk); | |
1873 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1874 | |
a51aa0c0 | 1875 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1876 | } |
1877 | ||
1878 | static ssize_t rbd_major_show(struct device *dev, | |
1879 | struct device_attribute *attr, char *buf) | |
1880 | { | |
593a9e7b | 1881 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1882 | |
dfc5606d YS |
1883 | return sprintf(buf, "%d\n", rbd_dev->major); |
1884 | } | |
1885 | ||
1886 | static ssize_t rbd_client_id_show(struct device *dev, | |
1887 | struct device_attribute *attr, char *buf) | |
602adf40 | 1888 | { |
593a9e7b | 1889 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1890 | |
1dbb4399 AE |
1891 | return sprintf(buf, "client%lld\n", |
1892 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1893 | } |
1894 | ||
dfc5606d YS |
1895 | static ssize_t rbd_pool_show(struct device *dev, |
1896 | struct device_attribute *attr, char *buf) | |
602adf40 | 1897 | { |
593a9e7b | 1898 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1899 | |
1900 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1901 | } | |
1902 | ||
9bb2f334 AE |
1903 | static ssize_t rbd_pool_id_show(struct device *dev, |
1904 | struct device_attribute *attr, char *buf) | |
1905 | { | |
1906 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1907 | ||
1908 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1909 | } | |
1910 | ||
dfc5606d YS |
1911 | static ssize_t rbd_name_show(struct device *dev, |
1912 | struct device_attribute *attr, char *buf) | |
1913 | { | |
593a9e7b | 1914 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1915 | |
0bed54dc | 1916 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1917 | } |
1918 | ||
1919 | static ssize_t rbd_snap_show(struct device *dev, | |
1920 | struct device_attribute *attr, | |
1921 | char *buf) | |
1922 | { | |
593a9e7b | 1923 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1924 | |
1925 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1926 | } | |
1927 | ||
1928 | static ssize_t rbd_image_refresh(struct device *dev, | |
1929 | struct device_attribute *attr, | |
1930 | const char *buf, | |
1931 | size_t size) | |
1932 | { | |
593a9e7b | 1933 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1934 | int ret; |
602adf40 | 1935 | |
1fe5e993 | 1936 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1937 | |
1938 | return ret < 0 ? ret : size; | |
dfc5606d | 1939 | } |
602adf40 | 1940 | |
dfc5606d YS |
1941 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1942 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1943 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1944 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1945 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1946 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1947 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1948 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1949 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1950 | |
1951 | static struct attribute *rbd_attrs[] = { | |
1952 | &dev_attr_size.attr, | |
1953 | &dev_attr_major.attr, | |
1954 | &dev_attr_client_id.attr, | |
1955 | &dev_attr_pool.attr, | |
9bb2f334 | 1956 | &dev_attr_pool_id.attr, |
dfc5606d YS |
1957 | &dev_attr_name.attr, |
1958 | &dev_attr_current_snap.attr, | |
1959 | &dev_attr_refresh.attr, | |
1960 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1961 | NULL |
1962 | }; | |
1963 | ||
1964 | static struct attribute_group rbd_attr_group = { | |
1965 | .attrs = rbd_attrs, | |
1966 | }; | |
1967 | ||
1968 | static const struct attribute_group *rbd_attr_groups[] = { | |
1969 | &rbd_attr_group, | |
1970 | NULL | |
1971 | }; | |
1972 | ||
1973 | static void rbd_sysfs_dev_release(struct device *dev) | |
1974 | { | |
1975 | } | |
1976 | ||
1977 | static struct device_type rbd_device_type = { | |
1978 | .name = "rbd", | |
1979 | .groups = rbd_attr_groups, | |
1980 | .release = rbd_sysfs_dev_release, | |
1981 | }; | |
1982 | ||
1983 | ||
1984 | /* | |
1985 | sysfs - snapshots | |
1986 | */ | |
1987 | ||
1988 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1989 | struct device_attribute *attr, | |
1990 | char *buf) | |
1991 | { | |
1992 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1993 | ||
3591538f | 1994 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
1995 | } |
1996 | ||
1997 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1998 | struct device_attribute *attr, | |
1999 | char *buf) | |
2000 | { | |
2001 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2002 | ||
3591538f | 2003 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2004 | } |
2005 | ||
2006 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
2007 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
2008 | ||
2009 | static struct attribute *rbd_snap_attrs[] = { | |
2010 | &dev_attr_snap_size.attr, | |
2011 | &dev_attr_snap_id.attr, | |
2012 | NULL, | |
2013 | }; | |
2014 | ||
2015 | static struct attribute_group rbd_snap_attr_group = { | |
2016 | .attrs = rbd_snap_attrs, | |
2017 | }; | |
2018 | ||
2019 | static void rbd_snap_dev_release(struct device *dev) | |
2020 | { | |
2021 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2022 | kfree(snap->name); | |
2023 | kfree(snap); | |
2024 | } | |
2025 | ||
2026 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2027 | &rbd_snap_attr_group, | |
2028 | NULL | |
2029 | }; | |
2030 | ||
2031 | static struct device_type rbd_snap_device_type = { | |
2032 | .groups = rbd_snap_attr_groups, | |
2033 | .release = rbd_snap_dev_release, | |
2034 | }; | |
2035 | ||
14e7085d | 2036 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2037 | { |
2038 | list_del(&snap->node); | |
2039 | device_unregister(&snap->dev); | |
2040 | } | |
2041 | ||
14e7085d | 2042 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2043 | struct device *parent) |
2044 | { | |
2045 | struct device *dev = &snap->dev; | |
2046 | int ret; | |
2047 | ||
2048 | dev->type = &rbd_snap_device_type; | |
2049 | dev->parent = parent; | |
2050 | dev->release = rbd_snap_dev_release; | |
2051 | dev_set_name(dev, "snap_%s", snap->name); | |
2052 | ret = device_register(dev); | |
2053 | ||
2054 | return ret; | |
2055 | } | |
2056 | ||
4e891e0a AE |
2057 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2058 | int i, const char *name) | |
dfc5606d | 2059 | { |
4e891e0a | 2060 | struct rbd_snap *snap; |
dfc5606d | 2061 | int ret; |
4e891e0a AE |
2062 | |
2063 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2064 | if (!snap) |
4e891e0a AE |
2065 | return ERR_PTR(-ENOMEM); |
2066 | ||
2067 | ret = -ENOMEM; | |
dfc5606d | 2068 | snap->name = kstrdup(name, GFP_KERNEL); |
4e891e0a AE |
2069 | if (!snap->name) |
2070 | goto err; | |
2071 | ||
dfc5606d YS |
2072 | snap->size = rbd_dev->header.snap_sizes[i]; |
2073 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2074 | if (device_is_registered(&rbd_dev->dev)) { | |
14e7085d | 2075 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d YS |
2076 | if (ret < 0) |
2077 | goto err; | |
2078 | } | |
4e891e0a AE |
2079 | |
2080 | return snap; | |
2081 | ||
dfc5606d YS |
2082 | err: |
2083 | kfree(snap->name); | |
2084 | kfree(snap); | |
4e891e0a AE |
2085 | |
2086 | return ERR_PTR(ret); | |
dfc5606d YS |
2087 | } |
2088 | ||
2089 | /* | |
35938150 AE |
2090 | * Scan the rbd device's current snapshot list and compare it to the |
2091 | * newly-received snapshot context. Remove any existing snapshots | |
2092 | * not present in the new snapshot context. Add a new snapshot for | |
2093 | * any snaphots in the snapshot context not in the current list. | |
2094 | * And verify there are no changes to snapshots we already know | |
2095 | * about. | |
2096 | * | |
2097 | * Assumes the snapshots in the snapshot context are sorted by | |
2098 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2099 | * are also maintained in that order.) | |
dfc5606d YS |
2100 | */ |
2101 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2102 | { | |
35938150 AE |
2103 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2104 | const u32 snap_count = snapc->num_snaps; | |
2105 | char *snap_name = rbd_dev->header.snap_names; | |
2106 | struct list_head *head = &rbd_dev->snaps; | |
2107 | struct list_head *links = head->next; | |
2108 | u32 index = 0; | |
dfc5606d | 2109 | |
35938150 AE |
2110 | while (index < snap_count || links != head) { |
2111 | u64 snap_id; | |
2112 | struct rbd_snap *snap; | |
dfc5606d | 2113 | |
35938150 AE |
2114 | snap_id = index < snap_count ? snapc->snaps[index] |
2115 | : CEPH_NOSNAP; | |
2116 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2117 | : NULL; | |
2118 | BUG_ON(snap && snap->id == CEPH_NOSNAP); | |
dfc5606d | 2119 | |
35938150 AE |
2120 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2121 | struct list_head *next = links->next; | |
dfc5606d | 2122 | |
35938150 | 2123 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2124 | |
35938150 | 2125 | if (rbd_dev->snap_id == snap->id) |
e88a36ec | 2126 | rbd_dev->snap_exists = false; |
35938150 AE |
2127 | __rbd_remove_snap_dev(snap); |
2128 | ||
2129 | /* Done with this list entry; advance */ | |
2130 | ||
2131 | links = next; | |
dfc5606d YS |
2132 | continue; |
2133 | } | |
35938150 AE |
2134 | |
2135 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { | |
2136 | struct rbd_snap *new_snap; | |
2137 | ||
2138 | /* We haven't seen this snapshot before */ | |
2139 | ||
2140 | new_snap = __rbd_add_snap_dev(rbd_dev, index, | |
2141 | snap_name); | |
2142 | if (IS_ERR(new_snap)) | |
2143 | return PTR_ERR(new_snap); | |
2144 | ||
2145 | /* New goes before existing, or at end of list */ | |
2146 | ||
2147 | if (snap) | |
2148 | list_add_tail(&new_snap->node, &snap->node); | |
2149 | else | |
2150 | list_add(&new_snap->node, head); | |
2151 | } else { | |
2152 | /* Already have this one */ | |
2153 | ||
2154 | BUG_ON(snap->size != rbd_dev->header.snap_sizes[index]); | |
2155 | BUG_ON(strcmp(snap->name, snap_name)); | |
2156 | ||
2157 | /* Done with this list entry; advance */ | |
2158 | ||
2159 | links = links->next; | |
dfc5606d | 2160 | } |
35938150 AE |
2161 | |
2162 | /* Advance to the next entry in the snapshot context */ | |
2163 | ||
2164 | index++; | |
2165 | snap_name += strlen(snap_name) + 1; | |
dfc5606d YS |
2166 | } |
2167 | ||
2168 | return 0; | |
2169 | } | |
2170 | ||
dfc5606d YS |
2171 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2172 | { | |
f0f8cef5 | 2173 | int ret; |
dfc5606d YS |
2174 | struct device *dev; |
2175 | struct rbd_snap *snap; | |
2176 | ||
2177 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2178 | dev = &rbd_dev->dev; | |
2179 | ||
2180 | dev->bus = &rbd_bus_type; | |
2181 | dev->type = &rbd_device_type; | |
2182 | dev->parent = &rbd_root_dev; | |
2183 | dev->release = rbd_dev_release; | |
de71a297 | 2184 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d YS |
2185 | ret = device_register(dev); |
2186 | if (ret < 0) | |
f0f8cef5 | 2187 | goto out; |
dfc5606d YS |
2188 | |
2189 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
14e7085d | 2190 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d | 2191 | if (ret < 0) |
602adf40 YS |
2192 | break; |
2193 | } | |
f0f8cef5 | 2194 | out: |
dfc5606d YS |
2195 | mutex_unlock(&ctl_mutex); |
2196 | return ret; | |
602adf40 YS |
2197 | } |
2198 | ||
dfc5606d YS |
2199 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2200 | { | |
2201 | device_unregister(&rbd_dev->dev); | |
2202 | } | |
2203 | ||
59c2be1e YS |
2204 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2205 | { | |
2206 | int ret, rc; | |
2207 | ||
2208 | do { | |
0e6f322d | 2209 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2210 | if (ret == -ERANGE) { |
1fe5e993 | 2211 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2212 | if (rc < 0) |
2213 | return rc; | |
2214 | } | |
2215 | } while (ret == -ERANGE); | |
2216 | ||
2217 | return ret; | |
2218 | } | |
2219 | ||
1ddbe94e AE |
2220 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2221 | ||
2222 | /* | |
499afd5b AE |
2223 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2224 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2225 | */ |
499afd5b | 2226 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2227 | { |
de71a297 | 2228 | rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max); |
499afd5b AE |
2229 | |
2230 | spin_lock(&rbd_dev_list_lock); | |
2231 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2232 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2233 | } |
b7f23c36 | 2234 | |
1ddbe94e | 2235 | /* |
499afd5b AE |
2236 | * Remove an rbd_dev from the global list, and record that its |
2237 | * identifier is no longer in use. | |
1ddbe94e | 2238 | */ |
499afd5b | 2239 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2240 | { |
d184f6bf | 2241 | struct list_head *tmp; |
de71a297 | 2242 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2243 | int max_id; |
2244 | ||
2245 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2246 | |
2247 | spin_lock(&rbd_dev_list_lock); | |
2248 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2249 | |
2250 | /* | |
2251 | * If the id being "put" is not the current maximum, there | |
2252 | * is nothing special we need to do. | |
2253 | */ | |
2254 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2255 | spin_unlock(&rbd_dev_list_lock); | |
2256 | return; | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * We need to update the current maximum id. Search the | |
2261 | * list to find out what it is. We're more likely to find | |
2262 | * the maximum at the end, so search the list backward. | |
2263 | */ | |
2264 | max_id = 0; | |
2265 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2266 | struct rbd_device *rbd_dev; | |
2267 | ||
2268 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2269 | if (rbd_id > max_id) | |
2270 | max_id = rbd_id; | |
2271 | } | |
499afd5b | 2272 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2273 | |
1ddbe94e | 2274 | /* |
d184f6bf AE |
2275 | * The max id could have been updated by rbd_id_get(), in |
2276 | * which case it now accurately reflects the new maximum. | |
2277 | * Be careful not to overwrite the maximum value in that | |
2278 | * case. | |
1ddbe94e | 2279 | */ |
d184f6bf | 2280 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2281 | } |
2282 | ||
e28fff26 AE |
2283 | /* |
2284 | * Skips over white space at *buf, and updates *buf to point to the | |
2285 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2286 | * the token (string of non-white space characters) found. Note |
2287 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2288 | */ |
2289 | static inline size_t next_token(const char **buf) | |
2290 | { | |
2291 | /* | |
2292 | * These are the characters that produce nonzero for | |
2293 | * isspace() in the "C" and "POSIX" locales. | |
2294 | */ | |
2295 | const char *spaces = " \f\n\r\t\v"; | |
2296 | ||
2297 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2298 | ||
2299 | return strcspn(*buf, spaces); /* Return token length */ | |
2300 | } | |
2301 | ||
2302 | /* | |
2303 | * Finds the next token in *buf, and if the provided token buffer is | |
2304 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2305 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2306 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2307 | * |
2308 | * Returns the length of the token found (not including the '\0'). | |
2309 | * Return value will be 0 if no token is found, and it will be >= | |
2310 | * token_size if the token would not fit. | |
2311 | * | |
593a9e7b | 2312 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2313 | * found token. Note that this occurs even if the token buffer is |
2314 | * too small to hold it. | |
2315 | */ | |
2316 | static inline size_t copy_token(const char **buf, | |
2317 | char *token, | |
2318 | size_t token_size) | |
2319 | { | |
2320 | size_t len; | |
2321 | ||
2322 | len = next_token(buf); | |
2323 | if (len < token_size) { | |
2324 | memcpy(token, *buf, len); | |
2325 | *(token + len) = '\0'; | |
2326 | } | |
2327 | *buf += len; | |
2328 | ||
2329 | return len; | |
2330 | } | |
2331 | ||
ea3352f4 AE |
2332 | /* |
2333 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2334 | * enough to hold a copy of it, and copies the token into the new | |
2335 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2336 | * that a duplicate buffer is created even for a zero-length token. | |
2337 | * | |
2338 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2339 | * pointer if memory for the duplicate was not available. If | |
2340 | * the lenp argument is a non-null pointer, the length of the token | |
2341 | * (not including the '\0') is returned in *lenp. | |
2342 | * | |
2343 | * If successful, the *buf pointer will be updated to point beyond | |
2344 | * the end of the found token. | |
2345 | * | |
2346 | * Note: uses GFP_KERNEL for allocation. | |
2347 | */ | |
2348 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2349 | { | |
2350 | char *dup; | |
2351 | size_t len; | |
2352 | ||
2353 | len = next_token(buf); | |
2354 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2355 | if (!dup) | |
2356 | return NULL; | |
2357 | ||
2358 | memcpy(dup, *buf, len); | |
2359 | *(dup + len) = '\0'; | |
2360 | *buf += len; | |
2361 | ||
2362 | if (lenp) | |
2363 | *lenp = len; | |
2364 | ||
2365 | return dup; | |
2366 | } | |
2367 | ||
a725f65e | 2368 | /* |
0bed54dc | 2369 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2370 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2371 | * on the list of monitor addresses and other options provided via | |
2372 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2373 | * |
2374 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2375 | */ |
2376 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2377 | const char *buf, | |
7ef3214a | 2378 | const char **mon_addrs, |
5214ecc4 | 2379 | size_t *mon_addrs_size, |
e28fff26 | 2380 | char *options, |
0bed54dc | 2381 | size_t options_size) |
e28fff26 | 2382 | { |
d22f76e7 AE |
2383 | size_t len; |
2384 | int ret; | |
e28fff26 AE |
2385 | |
2386 | /* The first four tokens are required */ | |
2387 | ||
7ef3214a AE |
2388 | len = next_token(&buf); |
2389 | if (!len) | |
a725f65e | 2390 | return -EINVAL; |
5214ecc4 | 2391 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2392 | *mon_addrs = buf; |
2393 | ||
2394 | buf += len; | |
a725f65e | 2395 | |
e28fff26 AE |
2396 | len = copy_token(&buf, options, options_size); |
2397 | if (!len || len >= options_size) | |
2398 | return -EINVAL; | |
2399 | ||
bf3e5ae1 | 2400 | ret = -ENOMEM; |
d22f76e7 AE |
2401 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2402 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2403 | goto out_err; |
e28fff26 | 2404 | |
0bed54dc AE |
2405 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2406 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2407 | goto out_err; |
a725f65e | 2408 | |
cb8627c7 AE |
2409 | /* Create the name of the header object */ |
2410 | ||
0bed54dc | 2411 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2412 | + sizeof (RBD_SUFFIX), |
2413 | GFP_KERNEL); | |
0bed54dc | 2414 | if (!rbd_dev->header_name) |
cb8627c7 | 2415 | goto out_err; |
0bed54dc | 2416 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2417 | |
e28fff26 | 2418 | /* |
820a5f3e AE |
2419 | * The snapshot name is optional. If none is is supplied, |
2420 | * we use the default value. | |
e28fff26 | 2421 | */ |
820a5f3e AE |
2422 | rbd_dev->snap_name = dup_token(&buf, &len); |
2423 | if (!rbd_dev->snap_name) | |
2424 | goto out_err; | |
2425 | if (!len) { | |
2426 | /* Replace the empty name with the default */ | |
2427 | kfree(rbd_dev->snap_name); | |
2428 | rbd_dev->snap_name | |
2429 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2430 | if (!rbd_dev->snap_name) | |
2431 | goto out_err; | |
2432 | ||
e28fff26 AE |
2433 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
2434 | sizeof (RBD_SNAP_HEAD_NAME)); | |
849b4260 | 2435 | } |
e28fff26 | 2436 | |
a725f65e | 2437 | return 0; |
d22f76e7 AE |
2438 | |
2439 | out_err: | |
0bed54dc | 2440 | kfree(rbd_dev->header_name); |
d78fd7ae | 2441 | rbd_dev->header_name = NULL; |
0bed54dc | 2442 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2443 | rbd_dev->image_name = NULL; |
2444 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2445 | kfree(rbd_dev->pool_name); |
2446 | rbd_dev->pool_name = NULL; | |
2447 | ||
2448 | return ret; | |
a725f65e AE |
2449 | } |
2450 | ||
59c2be1e YS |
2451 | static ssize_t rbd_add(struct bus_type *bus, |
2452 | const char *buf, | |
2453 | size_t count) | |
602adf40 | 2454 | { |
cb8627c7 AE |
2455 | char *options; |
2456 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2457 | const char *mon_addrs = NULL; |
2458 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2459 | struct ceph_osd_client *osdc; |
2460 | int rc = -ENOMEM; | |
602adf40 YS |
2461 | |
2462 | if (!try_module_get(THIS_MODULE)) | |
2463 | return -ENODEV; | |
2464 | ||
60571c7d | 2465 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2466 | if (!options) |
27cc2594 | 2467 | goto err_nomem; |
cb8627c7 AE |
2468 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2469 | if (!rbd_dev) | |
2470 | goto err_nomem; | |
602adf40 YS |
2471 | |
2472 | /* static rbd_device initialization */ | |
2473 | spin_lock_init(&rbd_dev->lock); | |
2474 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2475 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2476 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2477 | |
d184f6bf | 2478 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2479 | rbd_id_get(rbd_dev); |
602adf40 | 2480 | |
a725f65e | 2481 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2482 | BUILD_BUG_ON(DEV_NAME_LEN |
2483 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
de71a297 | 2484 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
a725f65e | 2485 | |
602adf40 | 2486 | /* parse add command */ |
7ef3214a | 2487 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2488 | options, count); |
a725f65e | 2489 | if (rc) |
f0f8cef5 | 2490 | goto err_put_id; |
e124a82f | 2491 | |
5214ecc4 AE |
2492 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
2493 | options); | |
d720bcb0 AE |
2494 | if (IS_ERR(rbd_dev->rbd_client)) { |
2495 | rc = PTR_ERR(rbd_dev->rbd_client); | |
d78fd7ae | 2496 | rbd_dev->rbd_client = NULL; |
f0f8cef5 | 2497 | goto err_put_id; |
d720bcb0 | 2498 | } |
602adf40 | 2499 | |
602adf40 | 2500 | /* pick the pool */ |
1dbb4399 | 2501 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2502 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2503 | if (rc < 0) | |
2504 | goto err_out_client; | |
9bb2f334 | 2505 | rbd_dev->pool_id = rc; |
602adf40 YS |
2506 | |
2507 | /* register our block device */ | |
27cc2594 AE |
2508 | rc = register_blkdev(0, rbd_dev->name); |
2509 | if (rc < 0) | |
602adf40 | 2510 | goto err_out_client; |
27cc2594 | 2511 | rbd_dev->major = rc; |
602adf40 | 2512 | |
dfc5606d YS |
2513 | rc = rbd_bus_add_dev(rbd_dev); |
2514 | if (rc) | |
766fc439 YS |
2515 | goto err_out_blkdev; |
2516 | ||
32eec68d AE |
2517 | /* |
2518 | * At this point cleanup in the event of an error is the job | |
2519 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2520 | * | |
2521 | * Set up and announce blkdev mapping. | |
2522 | */ | |
602adf40 YS |
2523 | rc = rbd_init_disk(rbd_dev); |
2524 | if (rc) | |
766fc439 | 2525 | goto err_out_bus; |
602adf40 | 2526 | |
59c2be1e YS |
2527 | rc = rbd_init_watch_dev(rbd_dev); |
2528 | if (rc) | |
2529 | goto err_out_bus; | |
2530 | ||
602adf40 YS |
2531 | return count; |
2532 | ||
766fc439 | 2533 | err_out_bus: |
766fc439 YS |
2534 | /* this will also clean up rest of rbd_dev stuff */ |
2535 | ||
2536 | rbd_bus_del_dev(rbd_dev); | |
2537 | kfree(options); | |
766fc439 YS |
2538 | return rc; |
2539 | ||
602adf40 YS |
2540 | err_out_blkdev: |
2541 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2542 | err_out_client: | |
2543 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2544 | err_put_id: |
cb8627c7 | 2545 | if (rbd_dev->pool_name) { |
820a5f3e | 2546 | kfree(rbd_dev->snap_name); |
0bed54dc AE |
2547 | kfree(rbd_dev->header_name); |
2548 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2549 | kfree(rbd_dev->pool_name); |
2550 | } | |
499afd5b | 2551 | rbd_id_put(rbd_dev); |
27cc2594 | 2552 | err_nomem: |
27cc2594 | 2553 | kfree(rbd_dev); |
cb8627c7 | 2554 | kfree(options); |
27cc2594 | 2555 | |
602adf40 YS |
2556 | dout("Error adding device %s\n", buf); |
2557 | module_put(THIS_MODULE); | |
27cc2594 AE |
2558 | |
2559 | return (ssize_t) rc; | |
602adf40 YS |
2560 | } |
2561 | ||
de71a297 | 2562 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2563 | { |
2564 | struct list_head *tmp; | |
2565 | struct rbd_device *rbd_dev; | |
2566 | ||
e124a82f | 2567 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2568 | list_for_each(tmp, &rbd_dev_list) { |
2569 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2570 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2571 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2572 | return rbd_dev; |
e124a82f | 2573 | } |
602adf40 | 2574 | } |
e124a82f | 2575 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2576 | return NULL; |
2577 | } | |
2578 | ||
dfc5606d | 2579 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2580 | { |
593a9e7b | 2581 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2582 | |
1dbb4399 AE |
2583 | if (rbd_dev->watch_request) { |
2584 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2585 | ||
2586 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2587 | rbd_dev->watch_request); |
1dbb4399 | 2588 | } |
59c2be1e | 2589 | if (rbd_dev->watch_event) |
070c633f | 2590 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2591 | |
602adf40 YS |
2592 | rbd_put_client(rbd_dev); |
2593 | ||
2594 | /* clean up and free blkdev */ | |
2595 | rbd_free_disk(rbd_dev); | |
2596 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2597 | |
2598 | /* done with the id, and with the rbd_dev */ | |
820a5f3e | 2599 | kfree(rbd_dev->snap_name); |
0bed54dc | 2600 | kfree(rbd_dev->header_name); |
d22f76e7 | 2601 | kfree(rbd_dev->pool_name); |
0bed54dc | 2602 | kfree(rbd_dev->image_name); |
32eec68d | 2603 | rbd_id_put(rbd_dev); |
602adf40 YS |
2604 | kfree(rbd_dev); |
2605 | ||
2606 | /* release module ref */ | |
2607 | module_put(THIS_MODULE); | |
602adf40 YS |
2608 | } |
2609 | ||
dfc5606d YS |
2610 | static ssize_t rbd_remove(struct bus_type *bus, |
2611 | const char *buf, | |
2612 | size_t count) | |
602adf40 YS |
2613 | { |
2614 | struct rbd_device *rbd_dev = NULL; | |
2615 | int target_id, rc; | |
2616 | unsigned long ul; | |
2617 | int ret = count; | |
2618 | ||
2619 | rc = strict_strtoul(buf, 10, &ul); | |
2620 | if (rc) | |
2621 | return rc; | |
2622 | ||
2623 | /* convert to int; abort if we lost anything in the conversion */ | |
2624 | target_id = (int) ul; | |
2625 | if (target_id != ul) | |
2626 | return -EINVAL; | |
2627 | ||
2628 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2629 | ||
2630 | rbd_dev = __rbd_get_dev(target_id); | |
2631 | if (!rbd_dev) { | |
2632 | ret = -ENOENT; | |
2633 | goto done; | |
2634 | } | |
2635 | ||
dfc5606d YS |
2636 | __rbd_remove_all_snaps(rbd_dev); |
2637 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2638 | |
2639 | done: | |
2640 | mutex_unlock(&ctl_mutex); | |
2641 | return ret; | |
2642 | } | |
2643 | ||
dfc5606d YS |
2644 | static ssize_t rbd_snap_add(struct device *dev, |
2645 | struct device_attribute *attr, | |
2646 | const char *buf, | |
2647 | size_t count) | |
602adf40 | 2648 | { |
593a9e7b | 2649 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2650 | int ret; |
2651 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2652 | if (!name) |
2653 | return -ENOMEM; | |
2654 | ||
dfc5606d | 2655 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2656 | |
2657 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2658 | ||
602adf40 YS |
2659 | ret = rbd_header_add_snap(rbd_dev, |
2660 | name, GFP_KERNEL); | |
2661 | if (ret < 0) | |
59c2be1e | 2662 | goto err_unlock; |
602adf40 | 2663 | |
b813623a | 2664 | ret = __rbd_refresh_header(rbd_dev, NULL); |
602adf40 | 2665 | if (ret < 0) |
59c2be1e YS |
2666 | goto err_unlock; |
2667 | ||
2668 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2669 | trigger a watch callback that would need to get that mutex */ | |
2670 | mutex_unlock(&ctl_mutex); | |
2671 | ||
2672 | /* make a best effort, don't error if failed */ | |
4cb16250 | 2673 | rbd_req_sync_notify(rbd_dev); |
602adf40 YS |
2674 | |
2675 | ret = count; | |
59c2be1e YS |
2676 | kfree(name); |
2677 | return ret; | |
2678 | ||
2679 | err_unlock: | |
602adf40 | 2680 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2681 | kfree(name); |
2682 | return ret; | |
2683 | } | |
2684 | ||
602adf40 YS |
2685 | /* |
2686 | * create control files in sysfs | |
dfc5606d | 2687 | * /sys/bus/rbd/... |
602adf40 YS |
2688 | */ |
2689 | static int rbd_sysfs_init(void) | |
2690 | { | |
dfc5606d | 2691 | int ret; |
602adf40 | 2692 | |
fed4c143 | 2693 | ret = device_register(&rbd_root_dev); |
21079786 | 2694 | if (ret < 0) |
dfc5606d | 2695 | return ret; |
602adf40 | 2696 | |
fed4c143 AE |
2697 | ret = bus_register(&rbd_bus_type); |
2698 | if (ret < 0) | |
2699 | device_unregister(&rbd_root_dev); | |
602adf40 | 2700 | |
602adf40 YS |
2701 | return ret; |
2702 | } | |
2703 | ||
2704 | static void rbd_sysfs_cleanup(void) | |
2705 | { | |
dfc5606d | 2706 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2707 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2708 | } |
2709 | ||
2710 | int __init rbd_init(void) | |
2711 | { | |
2712 | int rc; | |
2713 | ||
2714 | rc = rbd_sysfs_init(); | |
2715 | if (rc) | |
2716 | return rc; | |
f0f8cef5 | 2717 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2718 | return 0; |
2719 | } | |
2720 | ||
2721 | void __exit rbd_exit(void) | |
2722 | { | |
2723 | rbd_sysfs_cleanup(); | |
2724 | } | |
2725 | ||
2726 | module_init(rbd_init); | |
2727 | module_exit(rbd_exit); | |
2728 | ||
2729 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2730 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2731 | MODULE_DESCRIPTION("rados block device"); | |
2732 | ||
2733 | /* following authorship retained from original osdblk.c */ | |
2734 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2735 | ||
2736 | MODULE_LICENSE("GPL"); |