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Commit | Line | Data |
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602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
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 YS |
83 | struct ceph_snap_context *snapc; |
84 | size_t snap_names_len; | |
85 | u64 snap_seq; | |
86 | u32 total_snaps; | |
87 | ||
88 | char *snap_names; | |
89 | u64 *snap_sizes; | |
59c2be1e YS |
90 | |
91 | u64 obj_version; | |
92 | }; | |
93 | ||
94 | struct rbd_options { | |
95 | int notify_timeout; | |
602adf40 YS |
96 | }; |
97 | ||
98 | /* | |
f0f8cef5 | 99 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
100 | */ |
101 | struct rbd_client { | |
102 | struct ceph_client *client; | |
59c2be1e | 103 | struct rbd_options *rbd_opts; |
602adf40 YS |
104 | struct kref kref; |
105 | struct list_head node; | |
106 | }; | |
107 | ||
108 | /* | |
f0f8cef5 | 109 | * a request completion status |
602adf40 | 110 | */ |
1fec7093 YS |
111 | struct rbd_req_status { |
112 | int done; | |
113 | int rc; | |
114 | u64 bytes; | |
115 | }; | |
116 | ||
117 | /* | |
118 | * a collection of requests | |
119 | */ | |
120 | struct rbd_req_coll { | |
121 | int total; | |
122 | int num_done; | |
123 | struct kref kref; | |
124 | struct rbd_req_status status[0]; | |
602adf40 YS |
125 | }; |
126 | ||
f0f8cef5 AE |
127 | /* |
128 | * a single io request | |
129 | */ | |
130 | struct rbd_request { | |
131 | struct request *rq; /* blk layer request */ | |
132 | struct bio *bio; /* cloned bio */ | |
133 | struct page **pages; /* list of used pages */ | |
134 | u64 len; | |
135 | int coll_index; | |
136 | struct rbd_req_coll *coll; | |
137 | }; | |
138 | ||
dfc5606d YS |
139 | struct rbd_snap { |
140 | struct device dev; | |
141 | const char *name; | |
3591538f | 142 | u64 size; |
dfc5606d YS |
143 | struct list_head node; |
144 | u64 id; | |
145 | }; | |
146 | ||
602adf40 YS |
147 | /* |
148 | * a single device | |
149 | */ | |
150 | struct rbd_device { | |
151 | int id; /* blkdev unique id */ | |
152 | ||
153 | int major; /* blkdev assigned major */ | |
154 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
155 | struct request_queue *q; | |
156 | ||
602adf40 YS |
157 | struct rbd_client *rbd_client; |
158 | ||
159 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
160 | ||
161 | spinlock_t lock; /* queue lock */ | |
162 | ||
163 | struct rbd_image_header header; | |
0bed54dc AE |
164 | char *image_name; |
165 | size_t image_name_len; | |
166 | char *header_name; | |
d22f76e7 | 167 | char *pool_name; |
9bb2f334 | 168 | int pool_id; |
602adf40 | 169 | |
59c2be1e YS |
170 | struct ceph_osd_event *watch_event; |
171 | struct ceph_osd_request *watch_request; | |
172 | ||
c666601a JD |
173 | /* protects updating the header */ |
174 | struct rw_semaphore header_rwsem; | |
e88a36ec | 175 | /* name of the snapshot this device reads from */ |
820a5f3e | 176 | char *snap_name; |
e88a36ec | 177 | /* id of the snapshot this device reads from */ |
77dfe99f | 178 | u64 snap_id; /* current snapshot id */ |
e88a36ec JD |
179 | /* whether the snap_id this device reads from still exists */ |
180 | bool snap_exists; | |
181 | int read_only; | |
602adf40 YS |
182 | |
183 | struct list_head node; | |
dfc5606d YS |
184 | |
185 | /* list of snapshots */ | |
186 | struct list_head snaps; | |
187 | ||
188 | /* sysfs related */ | |
189 | struct device dev; | |
190 | }; | |
191 | ||
602adf40 | 192 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 193 | |
602adf40 | 194 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
195 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
196 | ||
432b8587 AE |
197 | static LIST_HEAD(rbd_client_list); /* clients */ |
198 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 199 | |
dfc5606d YS |
200 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
201 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
202 | static ssize_t rbd_snap_add(struct device *dev, |
203 | struct device_attribute *attr, | |
204 | const char *buf, | |
205 | size_t count); | |
206 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
69932487 | 207 | struct rbd_snap *snap); |
dfc5606d | 208 | |
f0f8cef5 AE |
209 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
210 | size_t count); | |
211 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
212 | size_t count); | |
213 | ||
214 | static struct bus_attribute rbd_bus_attrs[] = { | |
215 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
216 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
217 | __ATTR_NULL | |
218 | }; | |
219 | ||
220 | static struct bus_type rbd_bus_type = { | |
221 | .name = "rbd", | |
222 | .bus_attrs = rbd_bus_attrs, | |
223 | }; | |
224 | ||
225 | static void rbd_root_dev_release(struct device *dev) | |
226 | { | |
227 | } | |
228 | ||
229 | static struct device rbd_root_dev = { | |
230 | .init_name = "rbd", | |
231 | .release = rbd_root_dev_release, | |
232 | }; | |
233 | ||
dfc5606d | 234 | |
dfc5606d YS |
235 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
236 | { | |
237 | return get_device(&rbd_dev->dev); | |
238 | } | |
239 | ||
240 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
241 | { | |
242 | put_device(&rbd_dev->dev); | |
243 | } | |
602adf40 | 244 | |
263c6ca0 | 245 | static int __rbd_refresh_header(struct rbd_device *rbd_dev); |
59c2be1e | 246 | |
602adf40 YS |
247 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
248 | { | |
f0f8cef5 | 249 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 250 | |
dfc5606d YS |
251 | rbd_get_dev(rbd_dev); |
252 | ||
602adf40 YS |
253 | set_device_ro(bdev, rbd_dev->read_only); |
254 | ||
255 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
256 | return -EROFS; | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
dfc5606d YS |
261 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
262 | { | |
263 | struct rbd_device *rbd_dev = disk->private_data; | |
264 | ||
265 | rbd_put_dev(rbd_dev); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
602adf40 YS |
270 | static const struct block_device_operations rbd_bd_ops = { |
271 | .owner = THIS_MODULE, | |
272 | .open = rbd_open, | |
dfc5606d | 273 | .release = rbd_release, |
602adf40 YS |
274 | }; |
275 | ||
276 | /* | |
277 | * Initialize an rbd client instance. | |
43ae4701 | 278 | * We own *ceph_opts. |
602adf40 | 279 | */ |
43ae4701 | 280 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts, |
59c2be1e | 281 | struct rbd_options *rbd_opts) |
602adf40 YS |
282 | { |
283 | struct rbd_client *rbdc; | |
284 | int ret = -ENOMEM; | |
285 | ||
286 | dout("rbd_client_create\n"); | |
287 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
288 | if (!rbdc) | |
289 | goto out_opt; | |
290 | ||
291 | kref_init(&rbdc->kref); | |
292 | INIT_LIST_HEAD(&rbdc->node); | |
293 | ||
bc534d86 AE |
294 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
295 | ||
43ae4701 | 296 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 297 | if (IS_ERR(rbdc->client)) |
bc534d86 | 298 | goto out_mutex; |
43ae4701 | 299 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
300 | |
301 | ret = ceph_open_session(rbdc->client); | |
302 | if (ret < 0) | |
303 | goto out_err; | |
304 | ||
59c2be1e YS |
305 | rbdc->rbd_opts = rbd_opts; |
306 | ||
432b8587 | 307 | spin_lock(&rbd_client_list_lock); |
602adf40 | 308 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 309 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 310 | |
bc534d86 AE |
311 | mutex_unlock(&ctl_mutex); |
312 | ||
602adf40 YS |
313 | dout("rbd_client_create created %p\n", rbdc); |
314 | return rbdc; | |
315 | ||
316 | out_err: | |
317 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
318 | out_mutex: |
319 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
320 | kfree(rbdc); |
321 | out_opt: | |
43ae4701 AE |
322 | if (ceph_opts) |
323 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 324 | return ERR_PTR(ret); |
602adf40 YS |
325 | } |
326 | ||
327 | /* | |
328 | * Find a ceph client with specific addr and configuration. | |
329 | */ | |
43ae4701 | 330 | static struct rbd_client *__rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
331 | { |
332 | struct rbd_client *client_node; | |
333 | ||
43ae4701 | 334 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
335 | return NULL; |
336 | ||
337 | list_for_each_entry(client_node, &rbd_client_list, node) | |
43ae4701 | 338 | if (!ceph_compare_options(ceph_opts, client_node->client)) |
602adf40 YS |
339 | return client_node; |
340 | return NULL; | |
341 | } | |
342 | ||
59c2be1e YS |
343 | /* |
344 | * mount options | |
345 | */ | |
346 | enum { | |
347 | Opt_notify_timeout, | |
348 | Opt_last_int, | |
349 | /* int args above */ | |
350 | Opt_last_string, | |
351 | /* string args above */ | |
352 | }; | |
353 | ||
43ae4701 | 354 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
355 | {Opt_notify_timeout, "notify_timeout=%d"}, |
356 | /* int args above */ | |
357 | /* string args above */ | |
358 | {-1, NULL} | |
359 | }; | |
360 | ||
361 | static int parse_rbd_opts_token(char *c, void *private) | |
362 | { | |
43ae4701 | 363 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
364 | substring_t argstr[MAX_OPT_ARGS]; |
365 | int token, intval, ret; | |
366 | ||
43ae4701 | 367 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
368 | if (token < 0) |
369 | return -EINVAL; | |
370 | ||
371 | if (token < Opt_last_int) { | |
372 | ret = match_int(&argstr[0], &intval); | |
373 | if (ret < 0) { | |
374 | pr_err("bad mount option arg (not int) " | |
375 | "at '%s'\n", c); | |
376 | return ret; | |
377 | } | |
378 | dout("got int token %d val %d\n", token, intval); | |
379 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
380 | dout("got string token %d val %s\n", token, | |
381 | argstr[0].from); | |
382 | } else { | |
383 | dout("got token %d\n", token); | |
384 | } | |
385 | ||
386 | switch (token) { | |
387 | case Opt_notify_timeout: | |
43ae4701 | 388 | rbd_opts->notify_timeout = intval; |
59c2be1e YS |
389 | break; |
390 | default: | |
391 | BUG_ON(token); | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
602adf40 YS |
396 | /* |
397 | * Get a ceph client with specific addr and configuration, if one does | |
398 | * not exist create it. | |
399 | */ | |
5214ecc4 AE |
400 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
401 | size_t mon_addr_len, | |
402 | char *options) | |
602adf40 YS |
403 | { |
404 | struct rbd_client *rbdc; | |
43ae4701 | 405 | struct ceph_options *ceph_opts; |
59c2be1e YS |
406 | struct rbd_options *rbd_opts; |
407 | ||
408 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
409 | if (!rbd_opts) | |
d720bcb0 | 410 | return ERR_PTR(-ENOMEM); |
59c2be1e YS |
411 | |
412 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 | 413 | |
43ae4701 AE |
414 | ceph_opts = ceph_parse_options(options, mon_addr, |
415 | mon_addr + mon_addr_len, | |
416 | parse_rbd_opts_token, rbd_opts); | |
417 | if (IS_ERR(ceph_opts)) { | |
d720bcb0 | 418 | kfree(rbd_opts); |
43ae4701 | 419 | return ERR_CAST(ceph_opts); |
ee57741c | 420 | } |
602adf40 | 421 | |
432b8587 | 422 | spin_lock(&rbd_client_list_lock); |
43ae4701 | 423 | rbdc = __rbd_client_find(ceph_opts); |
602adf40 | 424 | if (rbdc) { |
602adf40 YS |
425 | /* using an existing client */ |
426 | kref_get(&rbdc->kref); | |
432b8587 | 427 | spin_unlock(&rbd_client_list_lock); |
e6994d3d | 428 | |
43ae4701 | 429 | ceph_destroy_options(ceph_opts); |
e6994d3d AE |
430 | kfree(rbd_opts); |
431 | ||
d720bcb0 | 432 | return rbdc; |
602adf40 | 433 | } |
432b8587 | 434 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 435 | |
43ae4701 | 436 | rbdc = rbd_client_create(ceph_opts, rbd_opts); |
d97081b0 | 437 | |
d720bcb0 AE |
438 | if (IS_ERR(rbdc)) |
439 | kfree(rbd_opts); | |
602adf40 | 440 | |
d720bcb0 | 441 | return rbdc; |
602adf40 YS |
442 | } |
443 | ||
444 | /* | |
445 | * Destroy ceph client | |
d23a4b3f | 446 | * |
432b8587 | 447 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
448 | */ |
449 | static void rbd_client_release(struct kref *kref) | |
450 | { | |
451 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
452 | ||
453 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 454 | spin_lock(&rbd_client_list_lock); |
602adf40 | 455 | list_del(&rbdc->node); |
cd9d9f5d | 456 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
457 | |
458 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 459 | kfree(rbdc->rbd_opts); |
602adf40 YS |
460 | kfree(rbdc); |
461 | } | |
462 | ||
463 | /* | |
464 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
465 | * it. | |
466 | */ | |
467 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
468 | { | |
469 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
470 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
471 | } |
472 | ||
1fec7093 YS |
473 | /* |
474 | * Destroy requests collection | |
475 | */ | |
476 | static void rbd_coll_release(struct kref *kref) | |
477 | { | |
478 | struct rbd_req_coll *coll = | |
479 | container_of(kref, struct rbd_req_coll, kref); | |
480 | ||
481 | dout("rbd_coll_release %p\n", coll); | |
482 | kfree(coll); | |
483 | } | |
602adf40 YS |
484 | |
485 | /* | |
486 | * Create a new header structure, translate header format from the on-disk | |
487 | * header. | |
488 | */ | |
489 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
490 | struct rbd_image_header_ondisk *ondisk, | |
50f7c4c9 | 491 | u32 allocated_snaps, |
602adf40 YS |
492 | gfp_t gfp_flags) |
493 | { | |
50f7c4c9 | 494 | u32 i, snap_count; |
602adf40 | 495 | |
21079786 | 496 | if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) |
81e759fb | 497 | return -ENXIO; |
81e759fb | 498 | |
00f1f36f | 499 | snap_count = le32_to_cpu(ondisk->snap_count); |
50f7c4c9 XW |
500 | if (snap_count > (UINT_MAX - sizeof(struct ceph_snap_context)) |
501 | / sizeof (*ondisk)) | |
502 | return -EINVAL; | |
602adf40 | 503 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + |
f9f9a190 | 504 | snap_count * sizeof(u64), |
602adf40 YS |
505 | gfp_flags); |
506 | if (!header->snapc) | |
507 | return -ENOMEM; | |
00f1f36f | 508 | |
00f1f36f | 509 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
602adf40 YS |
510 | if (snap_count) { |
511 | header->snap_names = kmalloc(header->snap_names_len, | |
f8ad495a | 512 | gfp_flags); |
602adf40 YS |
513 | if (!header->snap_names) |
514 | goto err_snapc; | |
515 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
f8ad495a | 516 | gfp_flags); |
602adf40 YS |
517 | if (!header->snap_sizes) |
518 | goto err_names; | |
519 | } else { | |
520 | header->snap_names = NULL; | |
521 | header->snap_sizes = NULL; | |
522 | } | |
849b4260 AE |
523 | |
524 | header->object_prefix = kmalloc(sizeof (ondisk->block_name) + 1, | |
525 | gfp_flags); | |
526 | if (!header->object_prefix) | |
527 | goto err_sizes; | |
528 | ||
ca1e49a6 | 529 | memcpy(header->object_prefix, ondisk->block_name, |
602adf40 | 530 | sizeof(ondisk->block_name)); |
849b4260 | 531 | header->object_prefix[sizeof (ondisk->block_name)] = '\0'; |
602adf40 YS |
532 | |
533 | header->image_size = le64_to_cpu(ondisk->image_size); | |
534 | header->obj_order = ondisk->options.order; | |
535 | header->crypt_type = ondisk->options.crypt_type; | |
536 | header->comp_type = ondisk->options.comp_type; | |
537 | ||
538 | atomic_set(&header->snapc->nref, 1); | |
539 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
540 | header->snapc->num_snaps = snap_count; | |
541 | header->total_snaps = snap_count; | |
542 | ||
21079786 | 543 | if (snap_count && allocated_snaps == snap_count) { |
602adf40 YS |
544 | for (i = 0; i < snap_count; i++) { |
545 | header->snapc->snaps[i] = | |
546 | le64_to_cpu(ondisk->snaps[i].id); | |
547 | header->snap_sizes[i] = | |
548 | le64_to_cpu(ondisk->snaps[i].image_size); | |
549 | } | |
550 | ||
551 | /* copy snapshot names */ | |
552 | memcpy(header->snap_names, &ondisk->snaps[i], | |
553 | header->snap_names_len); | |
554 | } | |
555 | ||
556 | return 0; | |
557 | ||
849b4260 AE |
558 | err_sizes: |
559 | kfree(header->snap_sizes); | |
602adf40 YS |
560 | err_names: |
561 | kfree(header->snap_names); | |
562 | err_snapc: | |
563 | kfree(header->snapc); | |
00f1f36f | 564 | return -ENOMEM; |
602adf40 YS |
565 | } |
566 | ||
602adf40 YS |
567 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
568 | u64 *seq, u64 *size) | |
569 | { | |
570 | int i; | |
571 | char *p = header->snap_names; | |
572 | ||
00f1f36f AE |
573 | for (i = 0; i < header->total_snaps; i++) { |
574 | if (!strcmp(snap_name, p)) { | |
602adf40 | 575 | |
00f1f36f | 576 | /* Found it. Pass back its id and/or size */ |
602adf40 | 577 | |
00f1f36f AE |
578 | if (seq) |
579 | *seq = header->snapc->snaps[i]; | |
580 | if (size) | |
581 | *size = header->snap_sizes[i]; | |
582 | return i; | |
583 | } | |
584 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
585 | } | |
586 | return -ENOENT; | |
602adf40 YS |
587 | } |
588 | ||
0ce1a794 | 589 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 590 | { |
0ce1a794 | 591 | struct rbd_image_header *header = &rbd_dev->header; |
602adf40 YS |
592 | struct ceph_snap_context *snapc = header->snapc; |
593 | int ret = -ENOENT; | |
594 | ||
0ce1a794 | 595 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 596 | |
0ce1a794 | 597 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 598 | sizeof (RBD_SNAP_HEAD_NAME))) { |
602adf40 YS |
599 | if (header->total_snaps) |
600 | snapc->seq = header->snap_seq; | |
601 | else | |
602 | snapc->seq = 0; | |
0ce1a794 | 603 | rbd_dev->snap_id = CEPH_NOSNAP; |
e88a36ec | 604 | rbd_dev->snap_exists = false; |
0ce1a794 | 605 | rbd_dev->read_only = 0; |
602adf40 YS |
606 | if (size) |
607 | *size = header->image_size; | |
608 | } else { | |
0ce1a794 AE |
609 | ret = snap_by_name(header, rbd_dev->snap_name, |
610 | &snapc->seq, size); | |
602adf40 YS |
611 | if (ret < 0) |
612 | goto done; | |
0ce1a794 | 613 | rbd_dev->snap_id = snapc->seq; |
e88a36ec | 614 | rbd_dev->snap_exists = true; |
0ce1a794 | 615 | rbd_dev->read_only = 1; |
602adf40 YS |
616 | } |
617 | ||
618 | ret = 0; | |
619 | done: | |
0ce1a794 | 620 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
621 | return ret; |
622 | } | |
623 | ||
624 | static void rbd_header_free(struct rbd_image_header *header) | |
625 | { | |
849b4260 | 626 | kfree(header->object_prefix); |
602adf40 | 627 | kfree(header->snap_sizes); |
849b4260 | 628 | kfree(header->snap_names); |
d1d25646 | 629 | ceph_put_snap_context(header->snapc); |
602adf40 YS |
630 | } |
631 | ||
632 | /* | |
633 | * get the actual striped segment name, offset and length | |
634 | */ | |
635 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 636 | const char *object_prefix, |
602adf40 YS |
637 | u64 ofs, u64 len, |
638 | char *seg_name, u64 *segofs) | |
639 | { | |
640 | u64 seg = ofs >> header->obj_order; | |
641 | ||
642 | if (seg_name) | |
643 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 644 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
645 | |
646 | ofs = ofs & ((1 << header->obj_order) - 1); | |
647 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
648 | ||
649 | if (segofs) | |
650 | *segofs = ofs; | |
651 | ||
652 | return len; | |
653 | } | |
654 | ||
1fec7093 YS |
655 | static int rbd_get_num_segments(struct rbd_image_header *header, |
656 | u64 ofs, u64 len) | |
657 | { | |
658 | u64 start_seg = ofs >> header->obj_order; | |
659 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
660 | return end_seg - start_seg + 1; | |
661 | } | |
662 | ||
029bcbd8 JD |
663 | /* |
664 | * returns the size of an object in the image | |
665 | */ | |
666 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
667 | { | |
668 | return 1 << header->obj_order; | |
669 | } | |
670 | ||
602adf40 YS |
671 | /* |
672 | * bio helpers | |
673 | */ | |
674 | ||
675 | static void bio_chain_put(struct bio *chain) | |
676 | { | |
677 | struct bio *tmp; | |
678 | ||
679 | while (chain) { | |
680 | tmp = chain; | |
681 | chain = chain->bi_next; | |
682 | bio_put(tmp); | |
683 | } | |
684 | } | |
685 | ||
686 | /* | |
687 | * zeros a bio chain, starting at specific offset | |
688 | */ | |
689 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
690 | { | |
691 | struct bio_vec *bv; | |
692 | unsigned long flags; | |
693 | void *buf; | |
694 | int i; | |
695 | int pos = 0; | |
696 | ||
697 | while (chain) { | |
698 | bio_for_each_segment(bv, chain, i) { | |
699 | if (pos + bv->bv_len > start_ofs) { | |
700 | int remainder = max(start_ofs - pos, 0); | |
701 | buf = bvec_kmap_irq(bv, &flags); | |
702 | memset(buf + remainder, 0, | |
703 | bv->bv_len - remainder); | |
85b5aaa6 | 704 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
705 | } |
706 | pos += bv->bv_len; | |
707 | } | |
708 | ||
709 | chain = chain->bi_next; | |
710 | } | |
711 | } | |
712 | ||
713 | /* | |
714 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
715 | * might return a bio_pair that will need to be released. | |
716 | */ | |
717 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
718 | struct bio_pair **bp, | |
719 | int len, gfp_t gfpmask) | |
720 | { | |
721 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
722 | int total = 0; | |
723 | ||
724 | if (*bp) { | |
725 | bio_pair_release(*bp); | |
726 | *bp = NULL; | |
727 | } | |
728 | ||
729 | while (old_chain && (total < len)) { | |
730 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
731 | if (!tmp) | |
732 | goto err_out; | |
733 | ||
734 | if (total + old_chain->bi_size > len) { | |
735 | struct bio_pair *bp; | |
736 | ||
737 | /* | |
738 | * this split can only happen with a single paged bio, | |
739 | * split_bio will BUG_ON if this is not the case | |
740 | */ | |
741 | dout("bio_chain_clone split! total=%d remaining=%d" | |
742 | "bi_size=%d\n", | |
743 | (int)total, (int)len-total, | |
744 | (int)old_chain->bi_size); | |
745 | ||
746 | /* split the bio. We'll release it either in the next | |
747 | call, or it will have to be released outside */ | |
593a9e7b | 748 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
749 | if (!bp) |
750 | goto err_out; | |
751 | ||
752 | __bio_clone(tmp, &bp->bio1); | |
753 | ||
754 | *next = &bp->bio2; | |
755 | } else { | |
756 | __bio_clone(tmp, old_chain); | |
757 | *next = old_chain->bi_next; | |
758 | } | |
759 | ||
760 | tmp->bi_bdev = NULL; | |
761 | gfpmask &= ~__GFP_WAIT; | |
762 | tmp->bi_next = NULL; | |
763 | ||
764 | if (!new_chain) { | |
765 | new_chain = tail = tmp; | |
766 | } else { | |
767 | tail->bi_next = tmp; | |
768 | tail = tmp; | |
769 | } | |
770 | old_chain = old_chain->bi_next; | |
771 | ||
772 | total += tmp->bi_size; | |
773 | } | |
774 | ||
775 | BUG_ON(total < len); | |
776 | ||
777 | if (tail) | |
778 | tail->bi_next = NULL; | |
779 | ||
780 | *old = old_chain; | |
781 | ||
782 | return new_chain; | |
783 | ||
784 | err_out: | |
785 | dout("bio_chain_clone with err\n"); | |
786 | bio_chain_put(new_chain); | |
787 | return NULL; | |
788 | } | |
789 | ||
790 | /* | |
791 | * helpers for osd request op vectors. | |
792 | */ | |
793 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
794 | int num_ops, | |
795 | int opcode, | |
796 | u32 payload_len) | |
797 | { | |
798 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
799 | GFP_NOIO); | |
800 | if (!*ops) | |
801 | return -ENOMEM; | |
802 | (*ops)[0].op = opcode; | |
803 | /* | |
804 | * op extent offset and length will be set later on | |
805 | * in calc_raw_layout() | |
806 | */ | |
807 | (*ops)[0].payload_len = payload_len; | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
812 | { | |
813 | kfree(ops); | |
814 | } | |
815 | ||
1fec7093 YS |
816 | static void rbd_coll_end_req_index(struct request *rq, |
817 | struct rbd_req_coll *coll, | |
818 | int index, | |
819 | int ret, u64 len) | |
820 | { | |
821 | struct request_queue *q; | |
822 | int min, max, i; | |
823 | ||
824 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", | |
825 | coll, index, ret, len); | |
826 | ||
827 | if (!rq) | |
828 | return; | |
829 | ||
830 | if (!coll) { | |
831 | blk_end_request(rq, ret, len); | |
832 | return; | |
833 | } | |
834 | ||
835 | q = rq->q; | |
836 | ||
837 | spin_lock_irq(q->queue_lock); | |
838 | coll->status[index].done = 1; | |
839 | coll->status[index].rc = ret; | |
840 | coll->status[index].bytes = len; | |
841 | max = min = coll->num_done; | |
842 | while (max < coll->total && coll->status[max].done) | |
843 | max++; | |
844 | ||
845 | for (i = min; i<max; i++) { | |
846 | __blk_end_request(rq, coll->status[i].rc, | |
847 | coll->status[i].bytes); | |
848 | coll->num_done++; | |
849 | kref_put(&coll->kref, rbd_coll_release); | |
850 | } | |
851 | spin_unlock_irq(q->queue_lock); | |
852 | } | |
853 | ||
854 | static void rbd_coll_end_req(struct rbd_request *req, | |
855 | int ret, u64 len) | |
856 | { | |
857 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
858 | } | |
859 | ||
602adf40 YS |
860 | /* |
861 | * Send ceph osd request | |
862 | */ | |
863 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 864 | struct rbd_device *rbd_dev, |
602adf40 YS |
865 | struct ceph_snap_context *snapc, |
866 | u64 snapid, | |
aded07ea | 867 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
868 | struct bio *bio, |
869 | struct page **pages, | |
870 | int num_pages, | |
871 | int flags, | |
872 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
873 | struct rbd_req_coll *coll, |
874 | int coll_index, | |
602adf40 | 875 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
876 | struct ceph_msg *msg), |
877 | struct ceph_osd_request **linger_req, | |
878 | u64 *ver) | |
602adf40 YS |
879 | { |
880 | struct ceph_osd_request *req; | |
881 | struct ceph_file_layout *layout; | |
882 | int ret; | |
883 | u64 bno; | |
884 | struct timespec mtime = CURRENT_TIME; | |
885 | struct rbd_request *req_data; | |
886 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 887 | struct ceph_osd_client *osdc; |
602adf40 | 888 | |
602adf40 | 889 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
890 | if (!req_data) { |
891 | if (coll) | |
892 | rbd_coll_end_req_index(rq, coll, coll_index, | |
893 | -ENOMEM, len); | |
894 | return -ENOMEM; | |
895 | } | |
896 | ||
897 | if (coll) { | |
898 | req_data->coll = coll; | |
899 | req_data->coll_index = coll_index; | |
900 | } | |
602adf40 | 901 | |
aded07ea AE |
902 | dout("rbd_do_request object_name=%s ofs=%lld len=%lld\n", |
903 | object_name, len, ofs); | |
602adf40 | 904 | |
0ce1a794 | 905 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
906 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
907 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 908 | if (!req) { |
4ad12621 | 909 | ret = -ENOMEM; |
602adf40 YS |
910 | goto done_pages; |
911 | } | |
912 | ||
913 | req->r_callback = rbd_cb; | |
914 | ||
915 | req_data->rq = rq; | |
916 | req_data->bio = bio; | |
917 | req_data->pages = pages; | |
918 | req_data->len = len; | |
919 | ||
920 | req->r_priv = req_data; | |
921 | ||
922 | reqhead = req->r_request->front.iov_base; | |
923 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
924 | ||
aded07ea | 925 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
926 | req->r_oid_len = strlen(req->r_oid); |
927 | ||
928 | layout = &req->r_file_layout; | |
929 | memset(layout, 0, sizeof(*layout)); | |
930 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
931 | layout->fl_stripe_count = cpu_to_le32(1); | |
932 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 933 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
934 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
935 | req, ops); | |
602adf40 YS |
936 | |
937 | ceph_osdc_build_request(req, ofs, &len, | |
938 | ops, | |
939 | snapc, | |
940 | &mtime, | |
941 | req->r_oid, req->r_oid_len); | |
602adf40 | 942 | |
59c2be1e | 943 | if (linger_req) { |
1dbb4399 | 944 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
945 | *linger_req = req; |
946 | } | |
947 | ||
1dbb4399 | 948 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
949 | if (ret < 0) |
950 | goto done_err; | |
951 | ||
952 | if (!rbd_cb) { | |
1dbb4399 | 953 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
954 | if (ver) |
955 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
1fec7093 YS |
956 | dout("reassert_ver=%lld\n", |
957 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
958 | ceph_osdc_put_request(req); |
959 | } | |
960 | return ret; | |
961 | ||
962 | done_err: | |
963 | bio_chain_put(req_data->bio); | |
964 | ceph_osdc_put_request(req); | |
965 | done_pages: | |
1fec7093 | 966 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 967 | kfree(req_data); |
602adf40 YS |
968 | return ret; |
969 | } | |
970 | ||
971 | /* | |
972 | * Ceph osd op callback | |
973 | */ | |
974 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
975 | { | |
976 | struct rbd_request *req_data = req->r_priv; | |
977 | struct ceph_osd_reply_head *replyhead; | |
978 | struct ceph_osd_op *op; | |
979 | __s32 rc; | |
980 | u64 bytes; | |
981 | int read_op; | |
982 | ||
983 | /* parse reply */ | |
984 | replyhead = msg->front.iov_base; | |
985 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
986 | op = (void *)(replyhead + 1); | |
987 | rc = le32_to_cpu(replyhead->result); | |
988 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 989 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 YS |
990 | |
991 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
992 | ||
993 | if (rc == -ENOENT && read_op) { | |
994 | zero_bio_chain(req_data->bio, 0); | |
995 | rc = 0; | |
996 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
997 | zero_bio_chain(req_data->bio, bytes); | |
998 | bytes = req_data->len; | |
999 | } | |
1000 | ||
1fec7093 | 1001 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1002 | |
1003 | if (req_data->bio) | |
1004 | bio_chain_put(req_data->bio); | |
1005 | ||
1006 | ceph_osdc_put_request(req); | |
1007 | kfree(req_data); | |
1008 | } | |
1009 | ||
59c2be1e YS |
1010 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1011 | { | |
1012 | ceph_osdc_put_request(req); | |
1013 | } | |
1014 | ||
602adf40 YS |
1015 | /* |
1016 | * Do a synchronous ceph osd operation | |
1017 | */ | |
0ce1a794 | 1018 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1019 | struct ceph_snap_context *snapc, |
1020 | u64 snapid, | |
1021 | int opcode, | |
1022 | int flags, | |
1023 | struct ceph_osd_req_op *orig_ops, | |
aded07ea | 1024 | const char *object_name, |
602adf40 | 1025 | u64 ofs, u64 len, |
59c2be1e YS |
1026 | char *buf, |
1027 | struct ceph_osd_request **linger_req, | |
1028 | u64 *ver) | |
602adf40 YS |
1029 | { |
1030 | int ret; | |
1031 | struct page **pages; | |
1032 | int num_pages; | |
1033 | struct ceph_osd_req_op *ops = orig_ops; | |
1034 | u32 payload_len; | |
1035 | ||
1036 | num_pages = calc_pages_for(ofs , len); | |
1037 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1038 | if (IS_ERR(pages)) |
1039 | return PTR_ERR(pages); | |
602adf40 YS |
1040 | |
1041 | if (!orig_ops) { | |
1042 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
1043 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1044 | if (ret < 0) | |
1045 | goto done; | |
1046 | ||
1047 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
1048 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
1049 | if (ret < 0) | |
1050 | goto done_ops; | |
1051 | } | |
1052 | } | |
1053 | ||
0ce1a794 | 1054 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1055 | object_name, ofs, len, NULL, |
602adf40 YS |
1056 | pages, num_pages, |
1057 | flags, | |
1058 | ops, | |
1fec7093 | 1059 | NULL, 0, |
59c2be1e YS |
1060 | NULL, |
1061 | linger_req, ver); | |
602adf40 YS |
1062 | if (ret < 0) |
1063 | goto done_ops; | |
1064 | ||
1065 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1066 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1067 | ||
1068 | done_ops: | |
1069 | if (!orig_ops) | |
1070 | rbd_destroy_ops(ops); | |
1071 | done: | |
1072 | ceph_release_page_vector(pages, num_pages); | |
1073 | return ret; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Do an asynchronous ceph osd operation | |
1078 | */ | |
1079 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1080 | struct rbd_device *rbd_dev, |
602adf40 YS |
1081 | struct ceph_snap_context *snapc, |
1082 | u64 snapid, | |
d1f57ea6 | 1083 | int opcode, int flags, |
602adf40 | 1084 | u64 ofs, u64 len, |
1fec7093 YS |
1085 | struct bio *bio, |
1086 | struct rbd_req_coll *coll, | |
1087 | int coll_index) | |
602adf40 YS |
1088 | { |
1089 | char *seg_name; | |
1090 | u64 seg_ofs; | |
1091 | u64 seg_len; | |
1092 | int ret; | |
1093 | struct ceph_osd_req_op *ops; | |
1094 | u32 payload_len; | |
1095 | ||
1096 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1097 | if (!seg_name) | |
1098 | return -ENOMEM; | |
1099 | ||
1100 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1101 | rbd_dev->header.object_prefix, |
602adf40 YS |
1102 | ofs, len, |
1103 | seg_name, &seg_ofs); | |
602adf40 YS |
1104 | |
1105 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1106 | ||
1107 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1108 | if (ret < 0) | |
1109 | goto done; | |
1110 | ||
1111 | /* we've taken care of segment sizes earlier when we | |
1112 | cloned the bios. We should never have a segment | |
1113 | truncated at this point */ | |
1114 | BUG_ON(seg_len < len); | |
1115 | ||
1116 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1117 | seg_name, seg_ofs, seg_len, | |
1118 | bio, | |
1119 | NULL, 0, | |
1120 | flags, | |
1121 | ops, | |
1fec7093 | 1122 | coll, coll_index, |
59c2be1e | 1123 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1124 | |
1125 | rbd_destroy_ops(ops); | |
602adf40 YS |
1126 | done: |
1127 | kfree(seg_name); | |
1128 | return ret; | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Request async osd write | |
1133 | */ | |
1134 | static int rbd_req_write(struct request *rq, | |
1135 | struct rbd_device *rbd_dev, | |
1136 | struct ceph_snap_context *snapc, | |
1137 | u64 ofs, u64 len, | |
1fec7093 YS |
1138 | struct bio *bio, |
1139 | struct rbd_req_coll *coll, | |
1140 | int coll_index) | |
602adf40 YS |
1141 | { |
1142 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1143 | CEPH_OSD_OP_WRITE, | |
1144 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1145 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1146 | } |
1147 | ||
1148 | /* | |
1149 | * Request async osd read | |
1150 | */ | |
1151 | static int rbd_req_read(struct request *rq, | |
1152 | struct rbd_device *rbd_dev, | |
1153 | u64 snapid, | |
1154 | u64 ofs, u64 len, | |
1fec7093 YS |
1155 | struct bio *bio, |
1156 | struct rbd_req_coll *coll, | |
1157 | int coll_index) | |
602adf40 YS |
1158 | { |
1159 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1160 | snapid, |
602adf40 YS |
1161 | CEPH_OSD_OP_READ, |
1162 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1163 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1164 | } |
1165 | ||
1166 | /* | |
1167 | * Request sync osd read | |
1168 | */ | |
0ce1a794 | 1169 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 YS |
1170 | struct ceph_snap_context *snapc, |
1171 | u64 snapid, | |
aded07ea | 1172 | const char *object_name, |
602adf40 | 1173 | u64 ofs, u64 len, |
59c2be1e YS |
1174 | char *buf, |
1175 | u64 *ver) | |
602adf40 | 1176 | { |
0ce1a794 | 1177 | return rbd_req_sync_op(rbd_dev, NULL, |
b06e6a6b | 1178 | snapid, |
602adf40 YS |
1179 | CEPH_OSD_OP_READ, |
1180 | CEPH_OSD_FLAG_READ, | |
1181 | NULL, | |
d1f57ea6 | 1182 | object_name, ofs, len, buf, NULL, ver); |
602adf40 YS |
1183 | } |
1184 | ||
1185 | /* | |
59c2be1e YS |
1186 | * Request sync osd watch |
1187 | */ | |
0ce1a794 | 1188 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e YS |
1189 | u64 ver, |
1190 | u64 notify_id, | |
aded07ea | 1191 | const char *object_name) |
59c2be1e YS |
1192 | { |
1193 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1194 | int ret; |
1195 | ||
1196 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); | |
59c2be1e YS |
1197 | if (ret < 0) |
1198 | return ret; | |
1199 | ||
0ce1a794 | 1200 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
59c2be1e YS |
1201 | ops[0].watch.cookie = notify_id; |
1202 | ops[0].watch.flag = 0; | |
1203 | ||
0ce1a794 | 1204 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
aded07ea | 1205 | object_name, 0, 0, NULL, |
ad4f232f | 1206 | NULL, 0, |
59c2be1e YS |
1207 | CEPH_OSD_FLAG_READ, |
1208 | ops, | |
1fec7093 | 1209 | NULL, 0, |
59c2be1e YS |
1210 | rbd_simple_req_cb, 0, NULL); |
1211 | ||
1212 | rbd_destroy_ops(ops); | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1217 | { | |
0ce1a794 | 1218 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
13143d2d SW |
1219 | int rc; |
1220 | ||
0ce1a794 | 1221 | if (!rbd_dev) |
59c2be1e YS |
1222 | return; |
1223 | ||
0bed54dc AE |
1224 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", |
1225 | rbd_dev->header_name, notify_id, (int) opcode); | |
59c2be1e | 1226 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
0ce1a794 | 1227 | rc = __rbd_refresh_header(rbd_dev); |
59c2be1e | 1228 | mutex_unlock(&ctl_mutex); |
13143d2d | 1229 | if (rc) |
f0f8cef5 | 1230 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1231 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1232 | |
0bed54dc | 1233 | rbd_req_sync_notify_ack(rbd_dev, ver, notify_id, rbd_dev->header_name); |
59c2be1e YS |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Request sync osd watch | |
1238 | */ | |
0ce1a794 | 1239 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev, |
aded07ea | 1240 | const char *object_name, |
59c2be1e YS |
1241 | u64 ver) |
1242 | { | |
1243 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1244 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1245 | |
1246 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1247 | if (ret < 0) | |
1248 | return ret; | |
1249 | ||
1250 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1251 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1252 | if (ret < 0) |
1253 | goto fail; | |
1254 | ||
1255 | ops[0].watch.ver = cpu_to_le64(ver); | |
0ce1a794 | 1256 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1257 | ops[0].watch.flag = 1; |
1258 | ||
0ce1a794 | 1259 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e YS |
1260 | CEPH_NOSNAP, |
1261 | 0, | |
1262 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1263 | ops, | |
d1f57ea6 | 1264 | object_name, 0, 0, NULL, |
0ce1a794 | 1265 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1266 | |
1267 | if (ret < 0) | |
1268 | goto fail_event; | |
1269 | ||
1270 | rbd_destroy_ops(ops); | |
1271 | return 0; | |
1272 | ||
1273 | fail_event: | |
0ce1a794 AE |
1274 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1275 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1276 | fail: |
1277 | rbd_destroy_ops(ops); | |
1278 | return ret; | |
1279 | } | |
1280 | ||
79e3057c YS |
1281 | /* |
1282 | * Request sync osd unwatch | |
1283 | */ | |
0ce1a794 | 1284 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev, |
aded07ea | 1285 | const char *object_name) |
79e3057c YS |
1286 | { |
1287 | struct ceph_osd_req_op *ops; | |
1288 | ||
1289 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1290 | if (ret < 0) | |
1291 | return ret; | |
1292 | ||
1293 | ops[0].watch.ver = 0; | |
0ce1a794 | 1294 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1295 | ops[0].watch.flag = 0; |
1296 | ||
0ce1a794 | 1297 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c YS |
1298 | CEPH_NOSNAP, |
1299 | 0, | |
1300 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1301 | ops, | |
d1f57ea6 | 1302 | object_name, 0, 0, NULL, NULL, NULL); |
79e3057c YS |
1303 | |
1304 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1305 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1306 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1307 | return ret; |
1308 | } | |
1309 | ||
59c2be1e | 1310 | struct rbd_notify_info { |
0ce1a794 | 1311 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1312 | }; |
1313 | ||
1314 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1315 | { | |
0ce1a794 AE |
1316 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1317 | if (!rbd_dev) | |
59c2be1e YS |
1318 | return; |
1319 | ||
0ce1a794 | 1320 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", |
0bed54dc | 1321 | rbd_dev->header_name, |
59c2be1e YS |
1322 | notify_id, (int)opcode); |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Request sync osd notify | |
1327 | */ | |
0ce1a794 | 1328 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev, |
aded07ea | 1329 | const char *object_name) |
59c2be1e YS |
1330 | { |
1331 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1332 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1333 | struct ceph_osd_event *event; |
1334 | struct rbd_notify_info info; | |
1335 | int payload_len = sizeof(u32) + sizeof(u32); | |
1336 | int ret; | |
1337 | ||
1338 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); | |
1339 | if (ret < 0) | |
1340 | return ret; | |
1341 | ||
0ce1a794 | 1342 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1343 | |
1344 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1345 | (void *)&info, &event); | |
1346 | if (ret < 0) | |
1347 | goto fail; | |
1348 | ||
1349 | ops[0].watch.ver = 1; | |
1350 | ops[0].watch.flag = 1; | |
1351 | ops[0].watch.cookie = event->cookie; | |
1352 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1353 | ops[0].watch.timeout = 12; | |
1354 | ||
0ce1a794 | 1355 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e YS |
1356 | CEPH_NOSNAP, |
1357 | 0, | |
1358 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1359 | ops, | |
d1f57ea6 | 1360 | object_name, 0, 0, NULL, NULL, NULL); |
59c2be1e YS |
1361 | if (ret < 0) |
1362 | goto fail_event; | |
1363 | ||
1364 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1365 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1366 | rbd_destroy_ops(ops); | |
1367 | return 0; | |
1368 | ||
1369 | fail_event: | |
1370 | ceph_osdc_cancel_event(event); | |
1371 | fail: | |
1372 | rbd_destroy_ops(ops); | |
1373 | return ret; | |
1374 | } | |
1375 | ||
602adf40 YS |
1376 | /* |
1377 | * Request sync osd read | |
1378 | */ | |
0ce1a794 | 1379 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1380 | const char *object_name, |
1381 | const char *class_name, | |
1382 | const char *method_name, | |
602adf40 | 1383 | const char *data, |
59c2be1e YS |
1384 | int len, |
1385 | u64 *ver) | |
602adf40 YS |
1386 | { |
1387 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1388 | int class_name_len = strlen(class_name); |
1389 | int method_name_len = strlen(method_name); | |
602adf40 | 1390 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, |
aded07ea | 1391 | class_name_len + method_name_len + len); |
602adf40 YS |
1392 | if (ret < 0) |
1393 | return ret; | |
1394 | ||
aded07ea AE |
1395 | ops[0].cls.class_name = class_name; |
1396 | ops[0].cls.class_len = (__u8) class_name_len; | |
1397 | ops[0].cls.method_name = method_name; | |
1398 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 YS |
1399 | ops[0].cls.argc = 0; |
1400 | ops[0].cls.indata = data; | |
1401 | ops[0].cls.indata_len = len; | |
1402 | ||
0ce1a794 | 1403 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 YS |
1404 | CEPH_NOSNAP, |
1405 | 0, | |
1406 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1407 | ops, | |
d1f57ea6 | 1408 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1409 | |
1410 | rbd_destroy_ops(ops); | |
1411 | ||
1412 | dout("cls_exec returned %d\n", ret); | |
1413 | return ret; | |
1414 | } | |
1415 | ||
1fec7093 YS |
1416 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1417 | { | |
1418 | struct rbd_req_coll *coll = | |
1419 | kzalloc(sizeof(struct rbd_req_coll) + | |
1420 | sizeof(struct rbd_req_status) * num_reqs, | |
1421 | GFP_ATOMIC); | |
1422 | ||
1423 | if (!coll) | |
1424 | return NULL; | |
1425 | coll->total = num_reqs; | |
1426 | kref_init(&coll->kref); | |
1427 | return coll; | |
1428 | } | |
1429 | ||
602adf40 YS |
1430 | /* |
1431 | * block device queue callback | |
1432 | */ | |
1433 | static void rbd_rq_fn(struct request_queue *q) | |
1434 | { | |
1435 | struct rbd_device *rbd_dev = q->queuedata; | |
1436 | struct request *rq; | |
1437 | struct bio_pair *bp = NULL; | |
1438 | ||
00f1f36f | 1439 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1440 | struct bio *bio; |
1441 | struct bio *rq_bio, *next_bio = NULL; | |
1442 | bool do_write; | |
1443 | int size, op_size = 0; | |
1444 | u64 ofs; | |
1fec7093 YS |
1445 | int num_segs, cur_seg = 0; |
1446 | struct rbd_req_coll *coll; | |
d1d25646 | 1447 | struct ceph_snap_context *snapc; |
602adf40 YS |
1448 | |
1449 | /* peek at request from block layer */ | |
1450 | if (!rq) | |
1451 | break; | |
1452 | ||
1453 | dout("fetched request\n"); | |
1454 | ||
1455 | /* filter out block requests we don't understand */ | |
1456 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1457 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1458 | continue; |
602adf40 YS |
1459 | } |
1460 | ||
1461 | /* deduce our operation (read, write) */ | |
1462 | do_write = (rq_data_dir(rq) == WRITE); | |
1463 | ||
1464 | size = blk_rq_bytes(rq); | |
593a9e7b | 1465 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 YS |
1466 | rq_bio = rq->bio; |
1467 | if (do_write && rbd_dev->read_only) { | |
1468 | __blk_end_request_all(rq, -EROFS); | |
00f1f36f | 1469 | continue; |
602adf40 YS |
1470 | } |
1471 | ||
1472 | spin_unlock_irq(q->queue_lock); | |
1473 | ||
d1d25646 | 1474 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1475 | |
d1d25646 | 1476 | if (rbd_dev->snap_id != CEPH_NOSNAP && !rbd_dev->snap_exists) { |
e88a36ec | 1477 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1478 | dout("request for non-existent snapshot"); |
1479 | spin_lock_irq(q->queue_lock); | |
1480 | __blk_end_request_all(rq, -ENXIO); | |
1481 | continue; | |
e88a36ec JD |
1482 | } |
1483 | ||
d1d25646 JD |
1484 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1485 | ||
1486 | up_read(&rbd_dev->header_rwsem); | |
1487 | ||
602adf40 YS |
1488 | dout("%s 0x%x bytes at 0x%llx\n", |
1489 | do_write ? "write" : "read", | |
593a9e7b | 1490 | size, blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1491 | |
1fec7093 YS |
1492 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1493 | coll = rbd_alloc_coll(num_segs); | |
1494 | if (!coll) { | |
1495 | spin_lock_irq(q->queue_lock); | |
1496 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1497 | ceph_put_snap_context(snapc); |
00f1f36f | 1498 | continue; |
1fec7093 YS |
1499 | } |
1500 | ||
602adf40 YS |
1501 | do { |
1502 | /* a bio clone to be passed down to OSD req */ | |
1503 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1504 | op_size = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1505 | rbd_dev->header.object_prefix, |
602adf40 YS |
1506 | ofs, size, |
1507 | NULL, NULL); | |
1fec7093 | 1508 | kref_get(&coll->kref); |
602adf40 YS |
1509 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1510 | op_size, GFP_ATOMIC); | |
1511 | if (!bio) { | |
1fec7093 YS |
1512 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1513 | -ENOMEM, op_size); | |
1514 | goto next_seg; | |
602adf40 YS |
1515 | } |
1516 | ||
1fec7093 | 1517 | |
602adf40 YS |
1518 | /* init OSD command: write or read */ |
1519 | if (do_write) | |
1520 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1521 | snapc, |
602adf40 | 1522 | ofs, |
1fec7093 YS |
1523 | op_size, bio, |
1524 | coll, cur_seg); | |
602adf40 YS |
1525 | else |
1526 | rbd_req_read(rq, rbd_dev, | |
77dfe99f | 1527 | rbd_dev->snap_id, |
602adf40 | 1528 | ofs, |
1fec7093 YS |
1529 | op_size, bio, |
1530 | coll, cur_seg); | |
602adf40 | 1531 | |
1fec7093 | 1532 | next_seg: |
602adf40 YS |
1533 | size -= op_size; |
1534 | ofs += op_size; | |
1535 | ||
1fec7093 | 1536 | cur_seg++; |
602adf40 YS |
1537 | rq_bio = next_bio; |
1538 | } while (size > 0); | |
1fec7093 | 1539 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1540 | |
1541 | if (bp) | |
1542 | bio_pair_release(bp); | |
602adf40 | 1543 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1544 | |
1545 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1546 | } |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1551 | * multiple osd objects. One exception would be with a single page bios, | |
1552 | * which we handle later at bio_chain_clone | |
1553 | */ | |
1554 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1555 | struct bio_vec *bvec) | |
1556 | { | |
1557 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1558 | unsigned int chunk_sectors; |
1559 | sector_t sector; | |
1560 | unsigned int bio_sectors; | |
602adf40 YS |
1561 | int max; |
1562 | ||
593a9e7b AE |
1563 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1564 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1565 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1566 | ||
602adf40 | 1567 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1568 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1569 | if (max < 0) |
1570 | max = 0; /* bio_add cannot handle a negative return */ | |
1571 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1572 | return bvec->bv_len; | |
1573 | return max; | |
1574 | } | |
1575 | ||
1576 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1577 | { | |
1578 | struct gendisk *disk = rbd_dev->disk; | |
1579 | ||
1580 | if (!disk) | |
1581 | return; | |
1582 | ||
1583 | rbd_header_free(&rbd_dev->header); | |
1584 | ||
1585 | if (disk->flags & GENHD_FL_UP) | |
1586 | del_gendisk(disk); | |
1587 | if (disk->queue) | |
1588 | blk_cleanup_queue(disk->queue); | |
1589 | put_disk(disk); | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * reload the ondisk the header | |
1594 | */ | |
1595 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1596 | struct rbd_image_header *header) | |
1597 | { | |
1598 | ssize_t rc; | |
1599 | struct rbd_image_header_ondisk *dh; | |
50f7c4c9 | 1600 | u32 snap_count = 0; |
59c2be1e | 1601 | u64 ver; |
00f1f36f | 1602 | size_t len; |
602adf40 | 1603 | |
00f1f36f AE |
1604 | /* |
1605 | * First reads the fixed-size header to determine the number | |
1606 | * of snapshots, then re-reads it, along with all snapshot | |
1607 | * records as well as their stored names. | |
1608 | */ | |
1609 | len = sizeof (*dh); | |
602adf40 | 1610 | while (1) { |
602adf40 YS |
1611 | dh = kmalloc(len, GFP_KERNEL); |
1612 | if (!dh) | |
1613 | return -ENOMEM; | |
1614 | ||
1615 | rc = rbd_req_sync_read(rbd_dev, | |
1616 | NULL, CEPH_NOSNAP, | |
0bed54dc | 1617 | rbd_dev->header_name, |
602adf40 | 1618 | 0, len, |
59c2be1e | 1619 | (char *)dh, &ver); |
602adf40 YS |
1620 | if (rc < 0) |
1621 | goto out_dh; | |
1622 | ||
1623 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
81e759fb | 1624 | if (rc < 0) { |
00f1f36f | 1625 | if (rc == -ENXIO) |
81e759fb | 1626 | pr_warning("unrecognized header format" |
0bed54dc AE |
1627 | " for image %s\n", |
1628 | rbd_dev->image_name); | |
602adf40 | 1629 | goto out_dh; |
81e759fb | 1630 | } |
602adf40 | 1631 | |
00f1f36f AE |
1632 | if (snap_count == header->total_snaps) |
1633 | break; | |
1634 | ||
1635 | snap_count = header->total_snaps; | |
1636 | len = sizeof (*dh) + | |
1637 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1638 | header->snap_names_len; | |
1639 | ||
1640 | rbd_header_free(header); | |
1641 | kfree(dh); | |
602adf40 | 1642 | } |
59c2be1e | 1643 | header->obj_version = ver; |
602adf40 YS |
1644 | |
1645 | out_dh: | |
1646 | kfree(dh); | |
1647 | return rc; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * create a snapshot | |
1652 | */ | |
0ce1a794 | 1653 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, |
602adf40 YS |
1654 | const char *snap_name, |
1655 | gfp_t gfp_flags) | |
1656 | { | |
1657 | int name_len = strlen(snap_name); | |
1658 | u64 new_snapid; | |
1659 | int ret; | |
916d4d67 | 1660 | void *data, *p, *e; |
59c2be1e | 1661 | u64 ver; |
1dbb4399 | 1662 | struct ceph_mon_client *monc; |
602adf40 YS |
1663 | |
1664 | /* we should create a snapshot only if we're pointing at the head */ | |
0ce1a794 | 1665 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1666 | return -EINVAL; |
1667 | ||
0ce1a794 AE |
1668 | monc = &rbd_dev->rbd_client->client->monc; |
1669 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
602adf40 YS |
1670 | dout("created snapid=%lld\n", new_snapid); |
1671 | if (ret < 0) | |
1672 | return ret; | |
1673 | ||
1674 | data = kmalloc(name_len + 16, gfp_flags); | |
1675 | if (!data) | |
1676 | return -ENOMEM; | |
1677 | ||
916d4d67 SW |
1678 | p = data; |
1679 | e = data + name_len + 16; | |
602adf40 | 1680 | |
916d4d67 SW |
1681 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1682 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1683 | |
0bed54dc | 1684 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1685 | "rbd", "snap_add", |
916d4d67 | 1686 | data, p - data, &ver); |
602adf40 | 1687 | |
916d4d67 | 1688 | kfree(data); |
602adf40 YS |
1689 | |
1690 | if (ret < 0) | |
1691 | return ret; | |
1692 | ||
0ce1a794 AE |
1693 | down_write(&rbd_dev->header_rwsem); |
1694 | rbd_dev->header.snapc->seq = new_snapid; | |
1695 | up_write(&rbd_dev->header_rwsem); | |
602adf40 YS |
1696 | |
1697 | return 0; | |
1698 | bad: | |
1699 | return -ERANGE; | |
1700 | } | |
1701 | ||
dfc5606d YS |
1702 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1703 | { | |
1704 | struct rbd_snap *snap; | |
1705 | ||
1706 | while (!list_empty(&rbd_dev->snaps)) { | |
1707 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); | |
1708 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1709 | } | |
1710 | } | |
1711 | ||
602adf40 YS |
1712 | /* |
1713 | * only read the first part of the ondisk header, without the snaps info | |
1714 | */ | |
263c6ca0 | 1715 | static int __rbd_refresh_header(struct rbd_device *rbd_dev) |
602adf40 YS |
1716 | { |
1717 | int ret; | |
1718 | struct rbd_image_header h; | |
1719 | u64 snap_seq; | |
59c2be1e | 1720 | int follow_seq = 0; |
602adf40 YS |
1721 | |
1722 | ret = rbd_read_header(rbd_dev, &h); | |
1723 | if (ret < 0) | |
1724 | return ret; | |
1725 | ||
a51aa0c0 JD |
1726 | down_write(&rbd_dev->header_rwsem); |
1727 | ||
9db4b3e3 | 1728 | /* resized? */ |
474ef7ce JD |
1729 | if (rbd_dev->snap_id == CEPH_NOSNAP) { |
1730 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1731 | ||
1732 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1733 | set_capacity(rbd_dev->disk, size); | |
1734 | } | |
9db4b3e3 | 1735 | |
602adf40 | 1736 | snap_seq = rbd_dev->header.snapc->seq; |
59c2be1e YS |
1737 | if (rbd_dev->header.total_snaps && |
1738 | rbd_dev->header.snapc->snaps[0] == snap_seq) | |
1739 | /* pointing at the head, will need to follow that | |
1740 | if head moves */ | |
1741 | follow_seq = 1; | |
602adf40 | 1742 | |
849b4260 | 1743 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1744 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1745 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1746 | /* osd requests may still refer to snapc */ |
1747 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1748 | |
93a24e08 | 1749 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1750 | rbd_dev->header.total_snaps = h.total_snaps; |
1751 | rbd_dev->header.snapc = h.snapc; | |
1752 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1753 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1754 | rbd_dev->header.snap_sizes = h.snap_sizes; |
849b4260 AE |
1755 | /* Free the extra copy of the object prefix */ |
1756 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1757 | kfree(h.object_prefix); | |
1758 | ||
59c2be1e YS |
1759 | if (follow_seq) |
1760 | rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; | |
1761 | else | |
1762 | rbd_dev->header.snapc->seq = snap_seq; | |
602adf40 | 1763 | |
dfc5606d YS |
1764 | ret = __rbd_init_snaps_header(rbd_dev); |
1765 | ||
c666601a | 1766 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1767 | |
dfc5606d | 1768 | return ret; |
602adf40 YS |
1769 | } |
1770 | ||
1771 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1772 | { | |
1773 | struct gendisk *disk; | |
1774 | struct request_queue *q; | |
1775 | int rc; | |
593a9e7b | 1776 | u64 segment_size; |
602adf40 YS |
1777 | u64 total_size = 0; |
1778 | ||
1779 | /* contact OSD, request size info about the object being mapped */ | |
1780 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1781 | if (rc) | |
1782 | return rc; | |
1783 | ||
dfc5606d YS |
1784 | /* no need to lock here, as rbd_dev is not registered yet */ |
1785 | rc = __rbd_init_snaps_header(rbd_dev); | |
1786 | if (rc) | |
1787 | return rc; | |
1788 | ||
cc9d734c | 1789 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1790 | if (rc) |
1791 | return rc; | |
1792 | ||
1793 | /* create gendisk info */ | |
1794 | rc = -ENOMEM; | |
1795 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1796 | if (!disk) | |
1797 | goto out; | |
1798 | ||
f0f8cef5 | 1799 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
aedfec59 | 1800 | rbd_dev->id); |
602adf40 YS |
1801 | disk->major = rbd_dev->major; |
1802 | disk->first_minor = 0; | |
1803 | disk->fops = &rbd_bd_ops; | |
1804 | disk->private_data = rbd_dev; | |
1805 | ||
1806 | /* init rq */ | |
1807 | rc = -ENOMEM; | |
1808 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1809 | if (!q) | |
1810 | goto out_disk; | |
029bcbd8 | 1811 | |
593a9e7b AE |
1812 | /* We use the default size, but let's be explicit about it. */ |
1813 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1814 | ||
029bcbd8 | 1815 | /* set io sizes to object size */ |
593a9e7b AE |
1816 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1817 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1818 | blk_queue_max_segment_size(q, segment_size); | |
1819 | blk_queue_io_min(q, segment_size); | |
1820 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1821 | |
602adf40 YS |
1822 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1823 | disk->queue = q; | |
1824 | ||
1825 | q->queuedata = rbd_dev; | |
1826 | ||
1827 | rbd_dev->disk = disk; | |
1828 | rbd_dev->q = q; | |
1829 | ||
1830 | /* finally, announce the disk to the world */ | |
593a9e7b | 1831 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1832 | add_disk(disk); |
1833 | ||
1834 | pr_info("%s: added with size 0x%llx\n", | |
1835 | disk->disk_name, (unsigned long long)total_size); | |
1836 | return 0; | |
1837 | ||
1838 | out_disk: | |
1839 | put_disk(disk); | |
1840 | out: | |
1841 | return rc; | |
1842 | } | |
1843 | ||
dfc5606d YS |
1844 | /* |
1845 | sysfs | |
1846 | */ | |
1847 | ||
593a9e7b AE |
1848 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1849 | { | |
1850 | return container_of(dev, struct rbd_device, dev); | |
1851 | } | |
1852 | ||
dfc5606d YS |
1853 | static ssize_t rbd_size_show(struct device *dev, |
1854 | struct device_attribute *attr, char *buf) | |
1855 | { | |
593a9e7b | 1856 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1857 | sector_t size; |
1858 | ||
1859 | down_read(&rbd_dev->header_rwsem); | |
1860 | size = get_capacity(rbd_dev->disk); | |
1861 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1862 | |
a51aa0c0 | 1863 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1864 | } |
1865 | ||
1866 | static ssize_t rbd_major_show(struct device *dev, | |
1867 | struct device_attribute *attr, char *buf) | |
1868 | { | |
593a9e7b | 1869 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1870 | |
dfc5606d YS |
1871 | return sprintf(buf, "%d\n", rbd_dev->major); |
1872 | } | |
1873 | ||
1874 | static ssize_t rbd_client_id_show(struct device *dev, | |
1875 | struct device_attribute *attr, char *buf) | |
602adf40 | 1876 | { |
593a9e7b | 1877 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1878 | |
1dbb4399 AE |
1879 | return sprintf(buf, "client%lld\n", |
1880 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1881 | } |
1882 | ||
dfc5606d YS |
1883 | static ssize_t rbd_pool_show(struct device *dev, |
1884 | struct device_attribute *attr, char *buf) | |
602adf40 | 1885 | { |
593a9e7b | 1886 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1887 | |
1888 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1889 | } | |
1890 | ||
9bb2f334 AE |
1891 | static ssize_t rbd_pool_id_show(struct device *dev, |
1892 | struct device_attribute *attr, char *buf) | |
1893 | { | |
1894 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1895 | ||
1896 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1897 | } | |
1898 | ||
dfc5606d YS |
1899 | static ssize_t rbd_name_show(struct device *dev, |
1900 | struct device_attribute *attr, char *buf) | |
1901 | { | |
593a9e7b | 1902 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1903 | |
0bed54dc | 1904 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1905 | } |
1906 | ||
1907 | static ssize_t rbd_snap_show(struct device *dev, | |
1908 | struct device_attribute *attr, | |
1909 | char *buf) | |
1910 | { | |
593a9e7b | 1911 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1912 | |
1913 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1914 | } | |
1915 | ||
1916 | static ssize_t rbd_image_refresh(struct device *dev, | |
1917 | struct device_attribute *attr, | |
1918 | const char *buf, | |
1919 | size_t size) | |
1920 | { | |
593a9e7b | 1921 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1922 | int rc; |
1923 | int ret = size; | |
602adf40 YS |
1924 | |
1925 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1926 | ||
263c6ca0 | 1927 | rc = __rbd_refresh_header(rbd_dev); |
dfc5606d YS |
1928 | if (rc < 0) |
1929 | ret = rc; | |
602adf40 | 1930 | |
dfc5606d YS |
1931 | mutex_unlock(&ctl_mutex); |
1932 | return ret; | |
1933 | } | |
602adf40 | 1934 | |
dfc5606d YS |
1935 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1936 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1937 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1938 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1939 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1940 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1941 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1942 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1943 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1944 | |
1945 | static struct attribute *rbd_attrs[] = { | |
1946 | &dev_attr_size.attr, | |
1947 | &dev_attr_major.attr, | |
1948 | &dev_attr_client_id.attr, | |
1949 | &dev_attr_pool.attr, | |
9bb2f334 | 1950 | &dev_attr_pool_id.attr, |
dfc5606d YS |
1951 | &dev_attr_name.attr, |
1952 | &dev_attr_current_snap.attr, | |
1953 | &dev_attr_refresh.attr, | |
1954 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1955 | NULL |
1956 | }; | |
1957 | ||
1958 | static struct attribute_group rbd_attr_group = { | |
1959 | .attrs = rbd_attrs, | |
1960 | }; | |
1961 | ||
1962 | static const struct attribute_group *rbd_attr_groups[] = { | |
1963 | &rbd_attr_group, | |
1964 | NULL | |
1965 | }; | |
1966 | ||
1967 | static void rbd_sysfs_dev_release(struct device *dev) | |
1968 | { | |
1969 | } | |
1970 | ||
1971 | static struct device_type rbd_device_type = { | |
1972 | .name = "rbd", | |
1973 | .groups = rbd_attr_groups, | |
1974 | .release = rbd_sysfs_dev_release, | |
1975 | }; | |
1976 | ||
1977 | ||
1978 | /* | |
1979 | sysfs - snapshots | |
1980 | */ | |
1981 | ||
1982 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1983 | struct device_attribute *attr, | |
1984 | char *buf) | |
1985 | { | |
1986 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1987 | ||
3591538f | 1988 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
1989 | } |
1990 | ||
1991 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1992 | struct device_attribute *attr, | |
1993 | char *buf) | |
1994 | { | |
1995 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1996 | ||
3591538f | 1997 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
1998 | } |
1999 | ||
2000 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
2001 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
2002 | ||
2003 | static struct attribute *rbd_snap_attrs[] = { | |
2004 | &dev_attr_snap_size.attr, | |
2005 | &dev_attr_snap_id.attr, | |
2006 | NULL, | |
2007 | }; | |
2008 | ||
2009 | static struct attribute_group rbd_snap_attr_group = { | |
2010 | .attrs = rbd_snap_attrs, | |
2011 | }; | |
2012 | ||
2013 | static void rbd_snap_dev_release(struct device *dev) | |
2014 | { | |
2015 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2016 | kfree(snap->name); | |
2017 | kfree(snap); | |
2018 | } | |
2019 | ||
2020 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2021 | &rbd_snap_attr_group, | |
2022 | NULL | |
2023 | }; | |
2024 | ||
2025 | static struct device_type rbd_snap_device_type = { | |
2026 | .groups = rbd_snap_attr_groups, | |
2027 | .release = rbd_snap_dev_release, | |
2028 | }; | |
2029 | ||
2030 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
2031 | struct rbd_snap *snap) | |
2032 | { | |
2033 | list_del(&snap->node); | |
2034 | device_unregister(&snap->dev); | |
2035 | } | |
2036 | ||
2037 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
2038 | struct rbd_snap *snap, | |
2039 | struct device *parent) | |
2040 | { | |
2041 | struct device *dev = &snap->dev; | |
2042 | int ret; | |
2043 | ||
2044 | dev->type = &rbd_snap_device_type; | |
2045 | dev->parent = parent; | |
2046 | dev->release = rbd_snap_dev_release; | |
2047 | dev_set_name(dev, "snap_%s", snap->name); | |
2048 | ret = device_register(dev); | |
2049 | ||
2050 | return ret; | |
2051 | } | |
2052 | ||
2053 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
2054 | int i, const char *name, | |
2055 | struct rbd_snap **snapp) | |
2056 | { | |
2057 | int ret; | |
2058 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
2059 | if (!snap) | |
2060 | return -ENOMEM; | |
2061 | snap->name = kstrdup(name, GFP_KERNEL); | |
2062 | snap->size = rbd_dev->header.snap_sizes[i]; | |
2063 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2064 | if (device_is_registered(&rbd_dev->dev)) { | |
2065 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2066 | &rbd_dev->dev); | |
2067 | if (ret < 0) | |
2068 | goto err; | |
2069 | } | |
2070 | *snapp = snap; | |
2071 | return 0; | |
2072 | err: | |
2073 | kfree(snap->name); | |
2074 | kfree(snap); | |
2075 | return ret; | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * search for the previous snap in a null delimited string list | |
2080 | */ | |
2081 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
2082 | { | |
2083 | if (name < start + 2) | |
2084 | return NULL; | |
2085 | ||
2086 | name -= 2; | |
2087 | while (*name) { | |
2088 | if (name == start) | |
2089 | return start; | |
2090 | name--; | |
2091 | } | |
2092 | return name + 1; | |
2093 | } | |
2094 | ||
2095 | /* | |
2096 | * compare the old list of snapshots that we have to what's in the header | |
2097 | * and update it accordingly. Note that the header holds the snapshots | |
2098 | * in a reverse order (from newest to oldest) and we need to go from | |
2099 | * older to new so that we don't get a duplicate snap name when | |
2100 | * doing the process (e.g., removed snapshot and recreated a new | |
2101 | * one with the same name. | |
2102 | */ | |
2103 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2104 | { | |
2105 | const char *name, *first_name; | |
2106 | int i = rbd_dev->header.total_snaps; | |
2107 | struct rbd_snap *snap, *old_snap = NULL; | |
2108 | int ret; | |
2109 | struct list_head *p, *n; | |
2110 | ||
2111 | first_name = rbd_dev->header.snap_names; | |
2112 | name = first_name + rbd_dev->header.snap_names_len; | |
2113 | ||
2114 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2115 | u64 cur_id; | |
2116 | ||
2117 | old_snap = list_entry(p, struct rbd_snap, node); | |
2118 | ||
2119 | if (i) | |
2120 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2121 | ||
2122 | if (!i || old_snap->id < cur_id) { | |
e88a36ec JD |
2123 | /* |
2124 | * old_snap->id was skipped, thus was | |
2125 | * removed. If this rbd_dev is mapped to | |
2126 | * the removed snapshot, record that it no | |
2127 | * longer exists, to prevent further I/O. | |
2128 | */ | |
2129 | if (rbd_dev->snap_id == old_snap->id) | |
2130 | rbd_dev->snap_exists = false; | |
dfc5606d YS |
2131 | __rbd_remove_snap_dev(rbd_dev, old_snap); |
2132 | continue; | |
2133 | } | |
2134 | if (old_snap->id == cur_id) { | |
2135 | /* we have this snapshot already */ | |
2136 | i--; | |
2137 | name = rbd_prev_snap_name(name, first_name); | |
2138 | continue; | |
2139 | } | |
2140 | for (; i > 0; | |
2141 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2142 | if (!name) { | |
2143 | WARN_ON(1); | |
2144 | return -EINVAL; | |
2145 | } | |
2146 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2147 | /* snapshot removal? handle it above */ | |
2148 | if (cur_id >= old_snap->id) | |
2149 | break; | |
2150 | /* a new snapshot */ | |
2151 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2152 | if (ret < 0) | |
2153 | return ret; | |
2154 | ||
2155 | /* note that we add it backward so using n and not p */ | |
2156 | list_add(&snap->node, n); | |
2157 | p = &snap->node; | |
2158 | } | |
2159 | } | |
2160 | /* we're done going over the old snap list, just add what's left */ | |
2161 | for (; i > 0; i--) { | |
2162 | name = rbd_prev_snap_name(name, first_name); | |
2163 | if (!name) { | |
2164 | WARN_ON(1); | |
2165 | return -EINVAL; | |
2166 | } | |
2167 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2168 | if (ret < 0) | |
2169 | return ret; | |
2170 | list_add(&snap->node, &rbd_dev->snaps); | |
2171 | } | |
2172 | ||
2173 | return 0; | |
2174 | } | |
2175 | ||
dfc5606d YS |
2176 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2177 | { | |
f0f8cef5 | 2178 | int ret; |
dfc5606d YS |
2179 | struct device *dev; |
2180 | struct rbd_snap *snap; | |
2181 | ||
2182 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2183 | dev = &rbd_dev->dev; | |
2184 | ||
2185 | dev->bus = &rbd_bus_type; | |
2186 | dev->type = &rbd_device_type; | |
2187 | dev->parent = &rbd_root_dev; | |
2188 | dev->release = rbd_dev_release; | |
2189 | dev_set_name(dev, "%d", rbd_dev->id); | |
2190 | ret = device_register(dev); | |
2191 | if (ret < 0) | |
f0f8cef5 | 2192 | goto out; |
dfc5606d YS |
2193 | |
2194 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2195 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2196 | &rbd_dev->dev); | |
2197 | if (ret < 0) | |
602adf40 YS |
2198 | break; |
2199 | } | |
f0f8cef5 | 2200 | out: |
dfc5606d YS |
2201 | mutex_unlock(&ctl_mutex); |
2202 | return ret; | |
602adf40 YS |
2203 | } |
2204 | ||
dfc5606d YS |
2205 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2206 | { | |
2207 | device_unregister(&rbd_dev->dev); | |
2208 | } | |
2209 | ||
59c2be1e YS |
2210 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2211 | { | |
2212 | int ret, rc; | |
2213 | ||
2214 | do { | |
0bed54dc | 2215 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->header_name, |
59c2be1e YS |
2216 | rbd_dev->header.obj_version); |
2217 | if (ret == -ERANGE) { | |
2218 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
263c6ca0 | 2219 | rc = __rbd_refresh_header(rbd_dev); |
59c2be1e YS |
2220 | mutex_unlock(&ctl_mutex); |
2221 | if (rc < 0) | |
2222 | return rc; | |
2223 | } | |
2224 | } while (ret == -ERANGE); | |
2225 | ||
2226 | return ret; | |
2227 | } | |
2228 | ||
1ddbe94e AE |
2229 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2230 | ||
2231 | /* | |
499afd5b AE |
2232 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2233 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2234 | */ |
499afd5b | 2235 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2236 | { |
499afd5b AE |
2237 | rbd_dev->id = atomic64_inc_return(&rbd_id_max); |
2238 | ||
2239 | spin_lock(&rbd_dev_list_lock); | |
2240 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2241 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2242 | } |
b7f23c36 | 2243 | |
1ddbe94e | 2244 | /* |
499afd5b AE |
2245 | * Remove an rbd_dev from the global list, and record that its |
2246 | * identifier is no longer in use. | |
1ddbe94e | 2247 | */ |
499afd5b | 2248 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2249 | { |
d184f6bf AE |
2250 | struct list_head *tmp; |
2251 | int rbd_id = rbd_dev->id; | |
2252 | int max_id; | |
2253 | ||
2254 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2255 | |
2256 | spin_lock(&rbd_dev_list_lock); | |
2257 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2258 | |
2259 | /* | |
2260 | * If the id being "put" is not the current maximum, there | |
2261 | * is nothing special we need to do. | |
2262 | */ | |
2263 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2264 | spin_unlock(&rbd_dev_list_lock); | |
2265 | return; | |
2266 | } | |
2267 | ||
2268 | /* | |
2269 | * We need to update the current maximum id. Search the | |
2270 | * list to find out what it is. We're more likely to find | |
2271 | * the maximum at the end, so search the list backward. | |
2272 | */ | |
2273 | max_id = 0; | |
2274 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2275 | struct rbd_device *rbd_dev; | |
2276 | ||
2277 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2278 | if (rbd_id > max_id) | |
2279 | max_id = rbd_id; | |
2280 | } | |
499afd5b | 2281 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2282 | |
1ddbe94e | 2283 | /* |
d184f6bf AE |
2284 | * The max id could have been updated by rbd_id_get(), in |
2285 | * which case it now accurately reflects the new maximum. | |
2286 | * Be careful not to overwrite the maximum value in that | |
2287 | * case. | |
1ddbe94e | 2288 | */ |
d184f6bf | 2289 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2290 | } |
2291 | ||
e28fff26 AE |
2292 | /* |
2293 | * Skips over white space at *buf, and updates *buf to point to the | |
2294 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2295 | * the token (string of non-white space characters) found. Note |
2296 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2297 | */ |
2298 | static inline size_t next_token(const char **buf) | |
2299 | { | |
2300 | /* | |
2301 | * These are the characters that produce nonzero for | |
2302 | * isspace() in the "C" and "POSIX" locales. | |
2303 | */ | |
2304 | const char *spaces = " \f\n\r\t\v"; | |
2305 | ||
2306 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2307 | ||
2308 | return strcspn(*buf, spaces); /* Return token length */ | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * Finds the next token in *buf, and if the provided token buffer is | |
2313 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2314 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2315 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2316 | * |
2317 | * Returns the length of the token found (not including the '\0'). | |
2318 | * Return value will be 0 if no token is found, and it will be >= | |
2319 | * token_size if the token would not fit. | |
2320 | * | |
593a9e7b | 2321 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2322 | * found token. Note that this occurs even if the token buffer is |
2323 | * too small to hold it. | |
2324 | */ | |
2325 | static inline size_t copy_token(const char **buf, | |
2326 | char *token, | |
2327 | size_t token_size) | |
2328 | { | |
2329 | size_t len; | |
2330 | ||
2331 | len = next_token(buf); | |
2332 | if (len < token_size) { | |
2333 | memcpy(token, *buf, len); | |
2334 | *(token + len) = '\0'; | |
2335 | } | |
2336 | *buf += len; | |
2337 | ||
2338 | return len; | |
2339 | } | |
2340 | ||
ea3352f4 AE |
2341 | /* |
2342 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2343 | * enough to hold a copy of it, and copies the token into the new | |
2344 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2345 | * that a duplicate buffer is created even for a zero-length token. | |
2346 | * | |
2347 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2348 | * pointer if memory for the duplicate was not available. If | |
2349 | * the lenp argument is a non-null pointer, the length of the token | |
2350 | * (not including the '\0') is returned in *lenp. | |
2351 | * | |
2352 | * If successful, the *buf pointer will be updated to point beyond | |
2353 | * the end of the found token. | |
2354 | * | |
2355 | * Note: uses GFP_KERNEL for allocation. | |
2356 | */ | |
2357 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2358 | { | |
2359 | char *dup; | |
2360 | size_t len; | |
2361 | ||
2362 | len = next_token(buf); | |
2363 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2364 | if (!dup) | |
2365 | return NULL; | |
2366 | ||
2367 | memcpy(dup, *buf, len); | |
2368 | *(dup + len) = '\0'; | |
2369 | *buf += len; | |
2370 | ||
2371 | if (lenp) | |
2372 | *lenp = len; | |
2373 | ||
2374 | return dup; | |
2375 | } | |
2376 | ||
a725f65e | 2377 | /* |
0bed54dc | 2378 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2379 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2380 | * on the list of monitor addresses and other options provided via | |
2381 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2382 | * |
2383 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2384 | */ |
2385 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2386 | const char *buf, | |
7ef3214a | 2387 | const char **mon_addrs, |
5214ecc4 | 2388 | size_t *mon_addrs_size, |
e28fff26 | 2389 | char *options, |
0bed54dc | 2390 | size_t options_size) |
e28fff26 | 2391 | { |
d22f76e7 AE |
2392 | size_t len; |
2393 | int ret; | |
e28fff26 AE |
2394 | |
2395 | /* The first four tokens are required */ | |
2396 | ||
7ef3214a AE |
2397 | len = next_token(&buf); |
2398 | if (!len) | |
a725f65e | 2399 | return -EINVAL; |
5214ecc4 | 2400 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2401 | *mon_addrs = buf; |
2402 | ||
2403 | buf += len; | |
a725f65e | 2404 | |
e28fff26 AE |
2405 | len = copy_token(&buf, options, options_size); |
2406 | if (!len || len >= options_size) | |
2407 | return -EINVAL; | |
2408 | ||
bf3e5ae1 | 2409 | ret = -ENOMEM; |
d22f76e7 AE |
2410 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2411 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2412 | goto out_err; |
e28fff26 | 2413 | |
0bed54dc AE |
2414 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2415 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2416 | goto out_err; |
a725f65e | 2417 | |
cb8627c7 AE |
2418 | /* Create the name of the header object */ |
2419 | ||
0bed54dc | 2420 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2421 | + sizeof (RBD_SUFFIX), |
2422 | GFP_KERNEL); | |
0bed54dc | 2423 | if (!rbd_dev->header_name) |
cb8627c7 | 2424 | goto out_err; |
0bed54dc | 2425 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2426 | |
e28fff26 | 2427 | /* |
820a5f3e AE |
2428 | * The snapshot name is optional. If none is is supplied, |
2429 | * we use the default value. | |
e28fff26 | 2430 | */ |
820a5f3e AE |
2431 | rbd_dev->snap_name = dup_token(&buf, &len); |
2432 | if (!rbd_dev->snap_name) | |
2433 | goto out_err; | |
2434 | if (!len) { | |
2435 | /* Replace the empty name with the default */ | |
2436 | kfree(rbd_dev->snap_name); | |
2437 | rbd_dev->snap_name | |
2438 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2439 | if (!rbd_dev->snap_name) | |
2440 | goto out_err; | |
2441 | ||
e28fff26 AE |
2442 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
2443 | sizeof (RBD_SNAP_HEAD_NAME)); | |
849b4260 | 2444 | } |
e28fff26 | 2445 | |
a725f65e | 2446 | return 0; |
d22f76e7 AE |
2447 | |
2448 | out_err: | |
0bed54dc AE |
2449 | kfree(rbd_dev->header_name); |
2450 | kfree(rbd_dev->image_name); | |
d22f76e7 AE |
2451 | kfree(rbd_dev->pool_name); |
2452 | rbd_dev->pool_name = NULL; | |
2453 | ||
2454 | return ret; | |
a725f65e AE |
2455 | } |
2456 | ||
59c2be1e YS |
2457 | static ssize_t rbd_add(struct bus_type *bus, |
2458 | const char *buf, | |
2459 | size_t count) | |
602adf40 | 2460 | { |
cb8627c7 AE |
2461 | char *options; |
2462 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2463 | const char *mon_addrs = NULL; |
2464 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2465 | struct ceph_osd_client *osdc; |
2466 | int rc = -ENOMEM; | |
602adf40 YS |
2467 | |
2468 | if (!try_module_get(THIS_MODULE)) | |
2469 | return -ENODEV; | |
2470 | ||
60571c7d | 2471 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2472 | if (!options) |
27cc2594 | 2473 | goto err_nomem; |
cb8627c7 AE |
2474 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2475 | if (!rbd_dev) | |
2476 | goto err_nomem; | |
602adf40 YS |
2477 | |
2478 | /* static rbd_device initialization */ | |
2479 | spin_lock_init(&rbd_dev->lock); | |
2480 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2481 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2482 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2483 | |
c666601a | 2484 | init_rwsem(&rbd_dev->header_rwsem); |
0e805a1d | 2485 | |
d184f6bf | 2486 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2487 | rbd_id_get(rbd_dev); |
602adf40 | 2488 | |
a725f65e | 2489 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2490 | BUILD_BUG_ON(DEV_NAME_LEN |
2491 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
2492 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->id); | |
a725f65e | 2493 | |
602adf40 | 2494 | /* parse add command */ |
7ef3214a | 2495 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2496 | options, count); |
a725f65e | 2497 | if (rc) |
f0f8cef5 | 2498 | goto err_put_id; |
e124a82f | 2499 | |
5214ecc4 AE |
2500 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
2501 | options); | |
d720bcb0 AE |
2502 | if (IS_ERR(rbd_dev->rbd_client)) { |
2503 | rc = PTR_ERR(rbd_dev->rbd_client); | |
f0f8cef5 | 2504 | goto err_put_id; |
d720bcb0 | 2505 | } |
602adf40 | 2506 | |
602adf40 | 2507 | /* pick the pool */ |
1dbb4399 | 2508 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2509 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2510 | if (rc < 0) | |
2511 | goto err_out_client; | |
9bb2f334 | 2512 | rbd_dev->pool_id = rc; |
602adf40 YS |
2513 | |
2514 | /* register our block device */ | |
27cc2594 AE |
2515 | rc = register_blkdev(0, rbd_dev->name); |
2516 | if (rc < 0) | |
602adf40 | 2517 | goto err_out_client; |
27cc2594 | 2518 | rbd_dev->major = rc; |
602adf40 | 2519 | |
dfc5606d YS |
2520 | rc = rbd_bus_add_dev(rbd_dev); |
2521 | if (rc) | |
766fc439 YS |
2522 | goto err_out_blkdev; |
2523 | ||
32eec68d AE |
2524 | /* |
2525 | * At this point cleanup in the event of an error is the job | |
2526 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2527 | * | |
2528 | * Set up and announce blkdev mapping. | |
2529 | */ | |
602adf40 YS |
2530 | rc = rbd_init_disk(rbd_dev); |
2531 | if (rc) | |
766fc439 | 2532 | goto err_out_bus; |
602adf40 | 2533 | |
59c2be1e YS |
2534 | rc = rbd_init_watch_dev(rbd_dev); |
2535 | if (rc) | |
2536 | goto err_out_bus; | |
2537 | ||
602adf40 YS |
2538 | return count; |
2539 | ||
766fc439 | 2540 | err_out_bus: |
766fc439 YS |
2541 | /* this will also clean up rest of rbd_dev stuff */ |
2542 | ||
2543 | rbd_bus_del_dev(rbd_dev); | |
2544 | kfree(options); | |
766fc439 YS |
2545 | return rc; |
2546 | ||
602adf40 YS |
2547 | err_out_blkdev: |
2548 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2549 | err_out_client: | |
2550 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2551 | err_put_id: |
cb8627c7 | 2552 | if (rbd_dev->pool_name) { |
820a5f3e | 2553 | kfree(rbd_dev->snap_name); |
0bed54dc AE |
2554 | kfree(rbd_dev->header_name); |
2555 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2556 | kfree(rbd_dev->pool_name); |
2557 | } | |
499afd5b | 2558 | rbd_id_put(rbd_dev); |
27cc2594 | 2559 | err_nomem: |
27cc2594 | 2560 | kfree(rbd_dev); |
cb8627c7 | 2561 | kfree(options); |
27cc2594 | 2562 | |
602adf40 YS |
2563 | dout("Error adding device %s\n", buf); |
2564 | module_put(THIS_MODULE); | |
27cc2594 AE |
2565 | |
2566 | return (ssize_t) rc; | |
602adf40 YS |
2567 | } |
2568 | ||
2569 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
2570 | { | |
2571 | struct list_head *tmp; | |
2572 | struct rbd_device *rbd_dev; | |
2573 | ||
e124a82f | 2574 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2575 | list_for_each(tmp, &rbd_dev_list) { |
2576 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
e124a82f AE |
2577 | if (rbd_dev->id == id) { |
2578 | spin_unlock(&rbd_dev_list_lock); | |
602adf40 | 2579 | return rbd_dev; |
e124a82f | 2580 | } |
602adf40 | 2581 | } |
e124a82f | 2582 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2583 | return NULL; |
2584 | } | |
2585 | ||
dfc5606d | 2586 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2587 | { |
593a9e7b | 2588 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2589 | |
1dbb4399 AE |
2590 | if (rbd_dev->watch_request) { |
2591 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2592 | ||
2593 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2594 | rbd_dev->watch_request); |
1dbb4399 | 2595 | } |
59c2be1e | 2596 | if (rbd_dev->watch_event) |
0bed54dc | 2597 | rbd_req_sync_unwatch(rbd_dev, rbd_dev->header_name); |
59c2be1e | 2598 | |
602adf40 YS |
2599 | rbd_put_client(rbd_dev); |
2600 | ||
2601 | /* clean up and free blkdev */ | |
2602 | rbd_free_disk(rbd_dev); | |
2603 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2604 | |
2605 | /* done with the id, and with the rbd_dev */ | |
820a5f3e | 2606 | kfree(rbd_dev->snap_name); |
0bed54dc | 2607 | kfree(rbd_dev->header_name); |
d22f76e7 | 2608 | kfree(rbd_dev->pool_name); |
0bed54dc | 2609 | kfree(rbd_dev->image_name); |
32eec68d | 2610 | rbd_id_put(rbd_dev); |
602adf40 YS |
2611 | kfree(rbd_dev); |
2612 | ||
2613 | /* release module ref */ | |
2614 | module_put(THIS_MODULE); | |
602adf40 YS |
2615 | } |
2616 | ||
dfc5606d YS |
2617 | static ssize_t rbd_remove(struct bus_type *bus, |
2618 | const char *buf, | |
2619 | size_t count) | |
602adf40 YS |
2620 | { |
2621 | struct rbd_device *rbd_dev = NULL; | |
2622 | int target_id, rc; | |
2623 | unsigned long ul; | |
2624 | int ret = count; | |
2625 | ||
2626 | rc = strict_strtoul(buf, 10, &ul); | |
2627 | if (rc) | |
2628 | return rc; | |
2629 | ||
2630 | /* convert to int; abort if we lost anything in the conversion */ | |
2631 | target_id = (int) ul; | |
2632 | if (target_id != ul) | |
2633 | return -EINVAL; | |
2634 | ||
2635 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2636 | ||
2637 | rbd_dev = __rbd_get_dev(target_id); | |
2638 | if (!rbd_dev) { | |
2639 | ret = -ENOENT; | |
2640 | goto done; | |
2641 | } | |
2642 | ||
dfc5606d YS |
2643 | __rbd_remove_all_snaps(rbd_dev); |
2644 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2645 | |
2646 | done: | |
2647 | mutex_unlock(&ctl_mutex); | |
2648 | return ret; | |
2649 | } | |
2650 | ||
dfc5606d YS |
2651 | static ssize_t rbd_snap_add(struct device *dev, |
2652 | struct device_attribute *attr, | |
2653 | const char *buf, | |
2654 | size_t count) | |
602adf40 | 2655 | { |
593a9e7b | 2656 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2657 | int ret; |
2658 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2659 | if (!name) |
2660 | return -ENOMEM; | |
2661 | ||
dfc5606d | 2662 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2663 | |
2664 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2665 | ||
602adf40 YS |
2666 | ret = rbd_header_add_snap(rbd_dev, |
2667 | name, GFP_KERNEL); | |
2668 | if (ret < 0) | |
59c2be1e | 2669 | goto err_unlock; |
602adf40 | 2670 | |
263c6ca0 | 2671 | ret = __rbd_refresh_header(rbd_dev); |
602adf40 | 2672 | if (ret < 0) |
59c2be1e YS |
2673 | goto err_unlock; |
2674 | ||
2675 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2676 | trigger a watch callback that would need to get that mutex */ | |
2677 | mutex_unlock(&ctl_mutex); | |
2678 | ||
2679 | /* make a best effort, don't error if failed */ | |
0bed54dc | 2680 | rbd_req_sync_notify(rbd_dev, rbd_dev->header_name); |
602adf40 YS |
2681 | |
2682 | ret = count; | |
59c2be1e YS |
2683 | kfree(name); |
2684 | return ret; | |
2685 | ||
2686 | err_unlock: | |
602adf40 | 2687 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2688 | kfree(name); |
2689 | return ret; | |
2690 | } | |
2691 | ||
602adf40 YS |
2692 | /* |
2693 | * create control files in sysfs | |
dfc5606d | 2694 | * /sys/bus/rbd/... |
602adf40 YS |
2695 | */ |
2696 | static int rbd_sysfs_init(void) | |
2697 | { | |
dfc5606d | 2698 | int ret; |
602adf40 | 2699 | |
fed4c143 | 2700 | ret = device_register(&rbd_root_dev); |
21079786 | 2701 | if (ret < 0) |
dfc5606d | 2702 | return ret; |
602adf40 | 2703 | |
fed4c143 AE |
2704 | ret = bus_register(&rbd_bus_type); |
2705 | if (ret < 0) | |
2706 | device_unregister(&rbd_root_dev); | |
602adf40 | 2707 | |
602adf40 YS |
2708 | return ret; |
2709 | } | |
2710 | ||
2711 | static void rbd_sysfs_cleanup(void) | |
2712 | { | |
dfc5606d | 2713 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2714 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2715 | } |
2716 | ||
2717 | int __init rbd_init(void) | |
2718 | { | |
2719 | int rc; | |
2720 | ||
2721 | rc = rbd_sysfs_init(); | |
2722 | if (rc) | |
2723 | return rc; | |
f0f8cef5 | 2724 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2725 | return 0; |
2726 | } | |
2727 | ||
2728 | void __exit rbd_exit(void) | |
2729 | { | |
2730 | rbd_sysfs_cleanup(); | |
2731 | } | |
2732 | ||
2733 | module_init(rbd_init); | |
2734 | module_exit(rbd_exit); | |
2735 | ||
2736 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2737 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2738 | MODULE_DESCRIPTION("rados block device"); | |
2739 | ||
2740 | /* following authorship retained from original osdblk.c */ | |
2741 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2742 | ||
2743 | MODULE_LICENSE("GPL"); |