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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; | |
602adf40 YS |
85 | u32 total_snaps; |
86 | ||
87 | char *snap_names; | |
88 | u64 *snap_sizes; | |
59c2be1e YS |
89 | |
90 | u64 obj_version; | |
91 | }; | |
92 | ||
93 | struct rbd_options { | |
94 | int notify_timeout; | |
602adf40 YS |
95 | }; |
96 | ||
97 | /* | |
f0f8cef5 | 98 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
99 | */ |
100 | struct rbd_client { | |
101 | struct ceph_client *client; | |
59c2be1e | 102 | struct rbd_options *rbd_opts; |
602adf40 YS |
103 | struct kref kref; |
104 | struct list_head node; | |
105 | }; | |
106 | ||
107 | /* | |
f0f8cef5 | 108 | * a request completion status |
602adf40 | 109 | */ |
1fec7093 YS |
110 | struct rbd_req_status { |
111 | int done; | |
112 | int rc; | |
113 | u64 bytes; | |
114 | }; | |
115 | ||
116 | /* | |
117 | * a collection of requests | |
118 | */ | |
119 | struct rbd_req_coll { | |
120 | int total; | |
121 | int num_done; | |
122 | struct kref kref; | |
123 | struct rbd_req_status status[0]; | |
602adf40 YS |
124 | }; |
125 | ||
f0f8cef5 AE |
126 | /* |
127 | * a single io request | |
128 | */ | |
129 | struct rbd_request { | |
130 | struct request *rq; /* blk layer request */ | |
131 | struct bio *bio; /* cloned bio */ | |
132 | struct page **pages; /* list of used pages */ | |
133 | u64 len; | |
134 | int coll_index; | |
135 | struct rbd_req_coll *coll; | |
136 | }; | |
137 | ||
dfc5606d YS |
138 | struct rbd_snap { |
139 | struct device dev; | |
140 | const char *name; | |
3591538f | 141 | u64 size; |
dfc5606d YS |
142 | struct list_head node; |
143 | u64 id; | |
144 | }; | |
145 | ||
602adf40 YS |
146 | /* |
147 | * a single device | |
148 | */ | |
149 | struct rbd_device { | |
de71a297 | 150 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
151 | |
152 | int major; /* blkdev assigned major */ | |
153 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
154 | struct request_queue *q; | |
155 | ||
602adf40 YS |
156 | struct rbd_client *rbd_client; |
157 | ||
158 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
159 | ||
160 | spinlock_t lock; /* queue lock */ | |
161 | ||
162 | struct rbd_image_header header; | |
0bed54dc AE |
163 | char *image_name; |
164 | size_t image_name_len; | |
165 | char *header_name; | |
d22f76e7 | 166 | char *pool_name; |
9bb2f334 | 167 | int pool_id; |
602adf40 | 168 | |
59c2be1e YS |
169 | struct ceph_osd_event *watch_event; |
170 | struct ceph_osd_request *watch_request; | |
171 | ||
c666601a JD |
172 | /* protects updating the header */ |
173 | struct rw_semaphore header_rwsem; | |
e88a36ec | 174 | /* name of the snapshot this device reads from */ |
820a5f3e | 175 | char *snap_name; |
e88a36ec | 176 | /* id of the snapshot this device reads from */ |
77dfe99f | 177 | u64 snap_id; /* current snapshot id */ |
e88a36ec JD |
178 | /* whether the snap_id this device reads from still exists */ |
179 | bool snap_exists; | |
180 | int read_only; | |
602adf40 YS |
181 | |
182 | struct list_head node; | |
dfc5606d YS |
183 | |
184 | /* list of snapshots */ | |
185 | struct list_head snaps; | |
186 | ||
187 | /* sysfs related */ | |
188 | struct device dev; | |
189 | }; | |
190 | ||
602adf40 | 191 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 192 | |
602adf40 | 193 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
194 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
195 | ||
432b8587 AE |
196 | static LIST_HEAD(rbd_client_list); /* clients */ |
197 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 198 | |
dfc5606d YS |
199 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
200 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
201 | static ssize_t rbd_snap_add(struct device *dev, |
202 | struct device_attribute *attr, | |
203 | const char *buf, | |
204 | size_t count); | |
14e7085d | 205 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 206 | |
f0f8cef5 AE |
207 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
208 | size_t count); | |
209 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
210 | size_t count); | |
211 | ||
212 | static struct bus_attribute rbd_bus_attrs[] = { | |
213 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
214 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
215 | __ATTR_NULL | |
216 | }; | |
217 | ||
218 | static struct bus_type rbd_bus_type = { | |
219 | .name = "rbd", | |
220 | .bus_attrs = rbd_bus_attrs, | |
221 | }; | |
222 | ||
223 | static void rbd_root_dev_release(struct device *dev) | |
224 | { | |
225 | } | |
226 | ||
227 | static struct device rbd_root_dev = { | |
228 | .init_name = "rbd", | |
229 | .release = rbd_root_dev_release, | |
230 | }; | |
231 | ||
dfc5606d | 232 | |
dfc5606d YS |
233 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
234 | { | |
235 | return get_device(&rbd_dev->dev); | |
236 | } | |
237 | ||
238 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
239 | { | |
240 | put_device(&rbd_dev->dev); | |
241 | } | |
602adf40 | 242 | |
1fe5e993 | 243 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 244 | |
602adf40 YS |
245 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
246 | { | |
f0f8cef5 | 247 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 248 | |
602adf40 YS |
249 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) |
250 | return -EROFS; | |
251 | ||
340c7a2b AE |
252 | rbd_get_dev(rbd_dev); |
253 | set_device_ro(bdev, rbd_dev->read_only); | |
254 | ||
602adf40 YS |
255 | return 0; |
256 | } | |
257 | ||
dfc5606d YS |
258 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
259 | { | |
260 | struct rbd_device *rbd_dev = disk->private_data; | |
261 | ||
262 | rbd_put_dev(rbd_dev); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
602adf40 YS |
267 | static const struct block_device_operations rbd_bd_ops = { |
268 | .owner = THIS_MODULE, | |
269 | .open = rbd_open, | |
dfc5606d | 270 | .release = rbd_release, |
602adf40 YS |
271 | }; |
272 | ||
273 | /* | |
274 | * Initialize an rbd client instance. | |
43ae4701 | 275 | * We own *ceph_opts. |
602adf40 | 276 | */ |
43ae4701 | 277 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts, |
59c2be1e | 278 | struct rbd_options *rbd_opts) |
602adf40 YS |
279 | { |
280 | struct rbd_client *rbdc; | |
281 | int ret = -ENOMEM; | |
282 | ||
283 | dout("rbd_client_create\n"); | |
284 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
285 | if (!rbdc) | |
286 | goto out_opt; | |
287 | ||
288 | kref_init(&rbdc->kref); | |
289 | INIT_LIST_HEAD(&rbdc->node); | |
290 | ||
bc534d86 AE |
291 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
292 | ||
43ae4701 | 293 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 294 | if (IS_ERR(rbdc->client)) |
bc534d86 | 295 | goto out_mutex; |
43ae4701 | 296 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
297 | |
298 | ret = ceph_open_session(rbdc->client); | |
299 | if (ret < 0) | |
300 | goto out_err; | |
301 | ||
59c2be1e YS |
302 | rbdc->rbd_opts = rbd_opts; |
303 | ||
432b8587 | 304 | spin_lock(&rbd_client_list_lock); |
602adf40 | 305 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 306 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 307 | |
bc534d86 AE |
308 | mutex_unlock(&ctl_mutex); |
309 | ||
602adf40 YS |
310 | dout("rbd_client_create created %p\n", rbdc); |
311 | return rbdc; | |
312 | ||
313 | out_err: | |
314 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
315 | out_mutex: |
316 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
317 | kfree(rbdc); |
318 | out_opt: | |
43ae4701 AE |
319 | if (ceph_opts) |
320 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 321 | return ERR_PTR(ret); |
602adf40 YS |
322 | } |
323 | ||
324 | /* | |
325 | * Find a ceph client with specific addr and configuration. | |
326 | */ | |
43ae4701 | 327 | static struct rbd_client *__rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
328 | { |
329 | struct rbd_client *client_node; | |
330 | ||
43ae4701 | 331 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
332 | return NULL; |
333 | ||
334 | list_for_each_entry(client_node, &rbd_client_list, node) | |
43ae4701 | 335 | if (!ceph_compare_options(ceph_opts, client_node->client)) |
602adf40 YS |
336 | return client_node; |
337 | return NULL; | |
338 | } | |
339 | ||
59c2be1e YS |
340 | /* |
341 | * mount options | |
342 | */ | |
343 | enum { | |
344 | Opt_notify_timeout, | |
345 | Opt_last_int, | |
346 | /* int args above */ | |
347 | Opt_last_string, | |
348 | /* string args above */ | |
349 | }; | |
350 | ||
43ae4701 | 351 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
352 | {Opt_notify_timeout, "notify_timeout=%d"}, |
353 | /* int args above */ | |
354 | /* string args above */ | |
355 | {-1, NULL} | |
356 | }; | |
357 | ||
358 | static int parse_rbd_opts_token(char *c, void *private) | |
359 | { | |
43ae4701 | 360 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
361 | substring_t argstr[MAX_OPT_ARGS]; |
362 | int token, intval, ret; | |
363 | ||
43ae4701 | 364 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
365 | if (token < 0) |
366 | return -EINVAL; | |
367 | ||
368 | if (token < Opt_last_int) { | |
369 | ret = match_int(&argstr[0], &intval); | |
370 | if (ret < 0) { | |
371 | pr_err("bad mount option arg (not int) " | |
372 | "at '%s'\n", c); | |
373 | return ret; | |
374 | } | |
375 | dout("got int token %d val %d\n", token, intval); | |
376 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
377 | dout("got string token %d val %s\n", token, | |
378 | argstr[0].from); | |
379 | } else { | |
380 | dout("got token %d\n", token); | |
381 | } | |
382 | ||
383 | switch (token) { | |
384 | case Opt_notify_timeout: | |
43ae4701 | 385 | rbd_opts->notify_timeout = intval; |
59c2be1e YS |
386 | break; |
387 | default: | |
388 | BUG_ON(token); | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
602adf40 YS |
393 | /* |
394 | * Get a ceph client with specific addr and configuration, if one does | |
395 | * not exist create it. | |
396 | */ | |
5214ecc4 AE |
397 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
398 | size_t mon_addr_len, | |
399 | char *options) | |
602adf40 YS |
400 | { |
401 | struct rbd_client *rbdc; | |
43ae4701 | 402 | struct ceph_options *ceph_opts; |
59c2be1e YS |
403 | struct rbd_options *rbd_opts; |
404 | ||
405 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
406 | if (!rbd_opts) | |
d720bcb0 | 407 | return ERR_PTR(-ENOMEM); |
59c2be1e YS |
408 | |
409 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 | 410 | |
43ae4701 AE |
411 | ceph_opts = ceph_parse_options(options, mon_addr, |
412 | mon_addr + mon_addr_len, | |
413 | parse_rbd_opts_token, rbd_opts); | |
414 | if (IS_ERR(ceph_opts)) { | |
d720bcb0 | 415 | kfree(rbd_opts); |
43ae4701 | 416 | return ERR_CAST(ceph_opts); |
ee57741c | 417 | } |
602adf40 | 418 | |
432b8587 | 419 | spin_lock(&rbd_client_list_lock); |
43ae4701 | 420 | rbdc = __rbd_client_find(ceph_opts); |
602adf40 | 421 | if (rbdc) { |
602adf40 YS |
422 | /* using an existing client */ |
423 | kref_get(&rbdc->kref); | |
432b8587 | 424 | spin_unlock(&rbd_client_list_lock); |
e6994d3d | 425 | |
43ae4701 | 426 | ceph_destroy_options(ceph_opts); |
e6994d3d AE |
427 | kfree(rbd_opts); |
428 | ||
d720bcb0 | 429 | return rbdc; |
602adf40 | 430 | } |
432b8587 | 431 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 432 | |
43ae4701 | 433 | rbdc = rbd_client_create(ceph_opts, rbd_opts); |
d97081b0 | 434 | |
d720bcb0 AE |
435 | if (IS_ERR(rbdc)) |
436 | kfree(rbd_opts); | |
602adf40 | 437 | |
d720bcb0 | 438 | return rbdc; |
602adf40 YS |
439 | } |
440 | ||
441 | /* | |
442 | * Destroy ceph client | |
d23a4b3f | 443 | * |
432b8587 | 444 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
445 | */ |
446 | static void rbd_client_release(struct kref *kref) | |
447 | { | |
448 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
449 | ||
450 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 451 | spin_lock(&rbd_client_list_lock); |
602adf40 | 452 | list_del(&rbdc->node); |
cd9d9f5d | 453 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
454 | |
455 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 456 | kfree(rbdc->rbd_opts); |
602adf40 YS |
457 | kfree(rbdc); |
458 | } | |
459 | ||
460 | /* | |
461 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
462 | * it. | |
463 | */ | |
464 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
465 | { | |
466 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
467 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
468 | } |
469 | ||
1fec7093 YS |
470 | /* |
471 | * Destroy requests collection | |
472 | */ | |
473 | static void rbd_coll_release(struct kref *kref) | |
474 | { | |
475 | struct rbd_req_coll *coll = | |
476 | container_of(kref, struct rbd_req_coll, kref); | |
477 | ||
478 | dout("rbd_coll_release %p\n", coll); | |
479 | kfree(coll); | |
480 | } | |
602adf40 | 481 | |
8e94af8e AE |
482 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
483 | { | |
484 | return !memcmp(&ondisk->text, | |
485 | RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)); | |
486 | } | |
487 | ||
602adf40 YS |
488 | /* |
489 | * Create a new header structure, translate header format from the on-disk | |
490 | * header. | |
491 | */ | |
492 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
493 | struct rbd_image_header_ondisk *ondisk, | |
ed63f4fd | 494 | u32 allocated_snaps) |
602adf40 | 495 | { |
ccece235 | 496 | u32 snap_count; |
602adf40 | 497 | |
8e94af8e | 498 | if (!rbd_dev_ondisk_valid(ondisk)) |
81e759fb | 499 | return -ENXIO; |
81e759fb | 500 | |
00f1f36f | 501 | snap_count = le32_to_cpu(ondisk->snap_count); |
ccece235 AE |
502 | if (snap_count > (SIZE_MAX - sizeof(struct ceph_snap_context)) |
503 | / sizeof (u64)) | |
50f7c4c9 | 504 | return -EINVAL; |
602adf40 | 505 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + |
f9f9a190 | 506 | snap_count * sizeof(u64), |
ed63f4fd | 507 | GFP_KERNEL); |
602adf40 YS |
508 | if (!header->snapc) |
509 | return -ENOMEM; | |
00f1f36f | 510 | |
602adf40 | 511 | if (snap_count) { |
ccece235 | 512 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
602adf40 | 513 | header->snap_names = kmalloc(header->snap_names_len, |
ed63f4fd | 514 | GFP_KERNEL); |
602adf40 YS |
515 | if (!header->snap_names) |
516 | goto err_snapc; | |
517 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
ed63f4fd | 518 | GFP_KERNEL); |
602adf40 YS |
519 | if (!header->snap_sizes) |
520 | goto err_names; | |
521 | } else { | |
ccece235 AE |
522 | WARN_ON(ondisk->snap_names_len); |
523 | header->snap_names_len = 0; | |
602adf40 YS |
524 | header->snap_names = NULL; |
525 | header->snap_sizes = NULL; | |
526 | } | |
849b4260 AE |
527 | |
528 | header->object_prefix = kmalloc(sizeof (ondisk->block_name) + 1, | |
ed63f4fd | 529 | GFP_KERNEL); |
849b4260 AE |
530 | if (!header->object_prefix) |
531 | goto err_sizes; | |
532 | ||
ca1e49a6 | 533 | memcpy(header->object_prefix, ondisk->block_name, |
602adf40 | 534 | sizeof(ondisk->block_name)); |
849b4260 | 535 | header->object_prefix[sizeof (ondisk->block_name)] = '\0'; |
602adf40 YS |
536 | |
537 | header->image_size = le64_to_cpu(ondisk->image_size); | |
538 | header->obj_order = ondisk->options.order; | |
539 | header->crypt_type = ondisk->options.crypt_type; | |
540 | header->comp_type = ondisk->options.comp_type; | |
541 | ||
542 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 543 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 YS |
544 | header->snapc->num_snaps = snap_count; |
545 | header->total_snaps = snap_count; | |
546 | ||
21079786 | 547 | if (snap_count && allocated_snaps == snap_count) { |
ccece235 AE |
548 | int i; |
549 | ||
602adf40 YS |
550 | for (i = 0; i < snap_count; i++) { |
551 | header->snapc->snaps[i] = | |
552 | le64_to_cpu(ondisk->snaps[i].id); | |
553 | header->snap_sizes[i] = | |
554 | le64_to_cpu(ondisk->snaps[i].image_size); | |
555 | } | |
556 | ||
557 | /* copy snapshot names */ | |
ccece235 | 558 | memcpy(header->snap_names, &ondisk->snaps[snap_count], |
602adf40 YS |
559 | header->snap_names_len); |
560 | } | |
561 | ||
562 | return 0; | |
563 | ||
849b4260 AE |
564 | err_sizes: |
565 | kfree(header->snap_sizes); | |
ccece235 | 566 | header->snap_sizes = NULL; |
602adf40 YS |
567 | err_names: |
568 | kfree(header->snap_names); | |
ccece235 | 569 | header->snap_names = NULL; |
602adf40 YS |
570 | err_snapc: |
571 | kfree(header->snapc); | |
ccece235 AE |
572 | header->snapc = NULL; |
573 | ||
00f1f36f | 574 | return -ENOMEM; |
602adf40 YS |
575 | } |
576 | ||
602adf40 YS |
577 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
578 | u64 *seq, u64 *size) | |
579 | { | |
580 | int i; | |
581 | char *p = header->snap_names; | |
582 | ||
00f1f36f AE |
583 | for (i = 0; i < header->total_snaps; i++) { |
584 | if (!strcmp(snap_name, p)) { | |
602adf40 | 585 | |
00f1f36f | 586 | /* Found it. Pass back its id and/or size */ |
602adf40 | 587 | |
00f1f36f AE |
588 | if (seq) |
589 | *seq = header->snapc->snaps[i]; | |
590 | if (size) | |
591 | *size = header->snap_sizes[i]; | |
592 | return i; | |
593 | } | |
594 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
595 | } | |
596 | return -ENOENT; | |
602adf40 YS |
597 | } |
598 | ||
0ce1a794 | 599 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 600 | { |
78dc447d | 601 | int ret; |
602adf40 | 602 | |
0ce1a794 | 603 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 604 | |
0ce1a794 | 605 | if (!memcmp(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 606 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0ce1a794 | 607 | rbd_dev->snap_id = CEPH_NOSNAP; |
e88a36ec | 608 | rbd_dev->snap_exists = false; |
0ce1a794 | 609 | rbd_dev->read_only = 0; |
602adf40 | 610 | if (size) |
78dc447d | 611 | *size = rbd_dev->header.image_size; |
602adf40 | 612 | } else { |
78dc447d AE |
613 | u64 snap_id = 0; |
614 | ||
615 | ret = snap_by_name(&rbd_dev->header, rbd_dev->snap_name, | |
616 | &snap_id, size); | |
602adf40 YS |
617 | if (ret < 0) |
618 | goto done; | |
78dc447d | 619 | rbd_dev->snap_id = snap_id; |
e88a36ec | 620 | rbd_dev->snap_exists = true; |
0ce1a794 | 621 | rbd_dev->read_only = 1; |
602adf40 YS |
622 | } |
623 | ||
624 | ret = 0; | |
625 | done: | |
0ce1a794 | 626 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
627 | return ret; |
628 | } | |
629 | ||
630 | static void rbd_header_free(struct rbd_image_header *header) | |
631 | { | |
849b4260 | 632 | kfree(header->object_prefix); |
602adf40 | 633 | kfree(header->snap_sizes); |
849b4260 | 634 | kfree(header->snap_names); |
d1d25646 | 635 | ceph_put_snap_context(header->snapc); |
602adf40 YS |
636 | } |
637 | ||
638 | /* | |
639 | * get the actual striped segment name, offset and length | |
640 | */ | |
641 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 642 | const char *object_prefix, |
602adf40 YS |
643 | u64 ofs, u64 len, |
644 | char *seg_name, u64 *segofs) | |
645 | { | |
646 | u64 seg = ofs >> header->obj_order; | |
647 | ||
648 | if (seg_name) | |
649 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 650 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
651 | |
652 | ofs = ofs & ((1 << header->obj_order) - 1); | |
653 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
654 | ||
655 | if (segofs) | |
656 | *segofs = ofs; | |
657 | ||
658 | return len; | |
659 | } | |
660 | ||
1fec7093 YS |
661 | static int rbd_get_num_segments(struct rbd_image_header *header, |
662 | u64 ofs, u64 len) | |
663 | { | |
664 | u64 start_seg = ofs >> header->obj_order; | |
665 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
666 | return end_seg - start_seg + 1; | |
667 | } | |
668 | ||
029bcbd8 JD |
669 | /* |
670 | * returns the size of an object in the image | |
671 | */ | |
672 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
673 | { | |
674 | return 1 << header->obj_order; | |
675 | } | |
676 | ||
602adf40 YS |
677 | /* |
678 | * bio helpers | |
679 | */ | |
680 | ||
681 | static void bio_chain_put(struct bio *chain) | |
682 | { | |
683 | struct bio *tmp; | |
684 | ||
685 | while (chain) { | |
686 | tmp = chain; | |
687 | chain = chain->bi_next; | |
688 | bio_put(tmp); | |
689 | } | |
690 | } | |
691 | ||
692 | /* | |
693 | * zeros a bio chain, starting at specific offset | |
694 | */ | |
695 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
696 | { | |
697 | struct bio_vec *bv; | |
698 | unsigned long flags; | |
699 | void *buf; | |
700 | int i; | |
701 | int pos = 0; | |
702 | ||
703 | while (chain) { | |
704 | bio_for_each_segment(bv, chain, i) { | |
705 | if (pos + bv->bv_len > start_ofs) { | |
706 | int remainder = max(start_ofs - pos, 0); | |
707 | buf = bvec_kmap_irq(bv, &flags); | |
708 | memset(buf + remainder, 0, | |
709 | bv->bv_len - remainder); | |
85b5aaa6 | 710 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
711 | } |
712 | pos += bv->bv_len; | |
713 | } | |
714 | ||
715 | chain = chain->bi_next; | |
716 | } | |
717 | } | |
718 | ||
719 | /* | |
720 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
721 | * might return a bio_pair that will need to be released. | |
722 | */ | |
723 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
724 | struct bio_pair **bp, | |
725 | int len, gfp_t gfpmask) | |
726 | { | |
727 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
728 | int total = 0; | |
729 | ||
730 | if (*bp) { | |
731 | bio_pair_release(*bp); | |
732 | *bp = NULL; | |
733 | } | |
734 | ||
735 | while (old_chain && (total < len)) { | |
736 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
737 | if (!tmp) | |
738 | goto err_out; | |
739 | ||
740 | if (total + old_chain->bi_size > len) { | |
741 | struct bio_pair *bp; | |
742 | ||
743 | /* | |
744 | * this split can only happen with a single paged bio, | |
745 | * split_bio will BUG_ON if this is not the case | |
746 | */ | |
747 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
748 | "bi_size=%u\n", |
749 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
750 | |
751 | /* split the bio. We'll release it either in the next | |
752 | call, or it will have to be released outside */ | |
593a9e7b | 753 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
754 | if (!bp) |
755 | goto err_out; | |
756 | ||
757 | __bio_clone(tmp, &bp->bio1); | |
758 | ||
759 | *next = &bp->bio2; | |
760 | } else { | |
761 | __bio_clone(tmp, old_chain); | |
762 | *next = old_chain->bi_next; | |
763 | } | |
764 | ||
765 | tmp->bi_bdev = NULL; | |
766 | gfpmask &= ~__GFP_WAIT; | |
767 | tmp->bi_next = NULL; | |
768 | ||
769 | if (!new_chain) { | |
770 | new_chain = tail = tmp; | |
771 | } else { | |
772 | tail->bi_next = tmp; | |
773 | tail = tmp; | |
774 | } | |
775 | old_chain = old_chain->bi_next; | |
776 | ||
777 | total += tmp->bi_size; | |
778 | } | |
779 | ||
780 | BUG_ON(total < len); | |
781 | ||
782 | if (tail) | |
783 | tail->bi_next = NULL; | |
784 | ||
785 | *old = old_chain; | |
786 | ||
787 | return new_chain; | |
788 | ||
789 | err_out: | |
790 | dout("bio_chain_clone with err\n"); | |
791 | bio_chain_put(new_chain); | |
792 | return NULL; | |
793 | } | |
794 | ||
795 | /* | |
796 | * helpers for osd request op vectors. | |
797 | */ | |
57cfc106 AE |
798 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
799 | int opcode, u32 payload_len) | |
602adf40 | 800 | { |
57cfc106 AE |
801 | struct ceph_osd_req_op *ops; |
802 | ||
803 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
804 | if (!ops) | |
805 | return NULL; | |
806 | ||
807 | ops[0].op = opcode; | |
808 | ||
602adf40 YS |
809 | /* |
810 | * op extent offset and length will be set later on | |
811 | * in calc_raw_layout() | |
812 | */ | |
57cfc106 AE |
813 | ops[0].payload_len = payload_len; |
814 | ||
815 | return ops; | |
602adf40 YS |
816 | } |
817 | ||
818 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
819 | { | |
820 | kfree(ops); | |
821 | } | |
822 | ||
1fec7093 YS |
823 | static void rbd_coll_end_req_index(struct request *rq, |
824 | struct rbd_req_coll *coll, | |
825 | int index, | |
826 | int ret, u64 len) | |
827 | { | |
828 | struct request_queue *q; | |
829 | int min, max, i; | |
830 | ||
bd919d45 AE |
831 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
832 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
833 | |
834 | if (!rq) | |
835 | return; | |
836 | ||
837 | if (!coll) { | |
838 | blk_end_request(rq, ret, len); | |
839 | return; | |
840 | } | |
841 | ||
842 | q = rq->q; | |
843 | ||
844 | spin_lock_irq(q->queue_lock); | |
845 | coll->status[index].done = 1; | |
846 | coll->status[index].rc = ret; | |
847 | coll->status[index].bytes = len; | |
848 | max = min = coll->num_done; | |
849 | while (max < coll->total && coll->status[max].done) | |
850 | max++; | |
851 | ||
852 | for (i = min; i<max; i++) { | |
853 | __blk_end_request(rq, coll->status[i].rc, | |
854 | coll->status[i].bytes); | |
855 | coll->num_done++; | |
856 | kref_put(&coll->kref, rbd_coll_release); | |
857 | } | |
858 | spin_unlock_irq(q->queue_lock); | |
859 | } | |
860 | ||
861 | static void rbd_coll_end_req(struct rbd_request *req, | |
862 | int ret, u64 len) | |
863 | { | |
864 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
865 | } | |
866 | ||
602adf40 YS |
867 | /* |
868 | * Send ceph osd request | |
869 | */ | |
870 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 871 | struct rbd_device *rbd_dev, |
602adf40 YS |
872 | struct ceph_snap_context *snapc, |
873 | u64 snapid, | |
aded07ea | 874 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
875 | struct bio *bio, |
876 | struct page **pages, | |
877 | int num_pages, | |
878 | int flags, | |
879 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
880 | struct rbd_req_coll *coll, |
881 | int coll_index, | |
602adf40 | 882 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
883 | struct ceph_msg *msg), |
884 | struct ceph_osd_request **linger_req, | |
885 | u64 *ver) | |
602adf40 YS |
886 | { |
887 | struct ceph_osd_request *req; | |
888 | struct ceph_file_layout *layout; | |
889 | int ret; | |
890 | u64 bno; | |
891 | struct timespec mtime = CURRENT_TIME; | |
892 | struct rbd_request *req_data; | |
893 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 894 | struct ceph_osd_client *osdc; |
602adf40 | 895 | |
602adf40 | 896 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
897 | if (!req_data) { |
898 | if (coll) | |
899 | rbd_coll_end_req_index(rq, coll, coll_index, | |
900 | -ENOMEM, len); | |
901 | return -ENOMEM; | |
902 | } | |
903 | ||
904 | if (coll) { | |
905 | req_data->coll = coll; | |
906 | req_data->coll_index = coll_index; | |
907 | } | |
602adf40 | 908 | |
bd919d45 AE |
909 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
910 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 911 | |
0ce1a794 | 912 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
913 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
914 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 915 | if (!req) { |
4ad12621 | 916 | ret = -ENOMEM; |
602adf40 YS |
917 | goto done_pages; |
918 | } | |
919 | ||
920 | req->r_callback = rbd_cb; | |
921 | ||
922 | req_data->rq = rq; | |
923 | req_data->bio = bio; | |
924 | req_data->pages = pages; | |
925 | req_data->len = len; | |
926 | ||
927 | req->r_priv = req_data; | |
928 | ||
929 | reqhead = req->r_request->front.iov_base; | |
930 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
931 | ||
aded07ea | 932 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
933 | req->r_oid_len = strlen(req->r_oid); |
934 | ||
935 | layout = &req->r_file_layout; | |
936 | memset(layout, 0, sizeof(*layout)); | |
937 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
938 | layout->fl_stripe_count = cpu_to_le32(1); | |
939 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 940 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
941 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
942 | req, ops); | |
602adf40 YS |
943 | |
944 | ceph_osdc_build_request(req, ofs, &len, | |
945 | ops, | |
946 | snapc, | |
947 | &mtime, | |
948 | req->r_oid, req->r_oid_len); | |
602adf40 | 949 | |
59c2be1e | 950 | if (linger_req) { |
1dbb4399 | 951 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
952 | *linger_req = req; |
953 | } | |
954 | ||
1dbb4399 | 955 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
956 | if (ret < 0) |
957 | goto done_err; | |
958 | ||
959 | if (!rbd_cb) { | |
1dbb4399 | 960 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
961 | if (ver) |
962 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
963 | dout("reassert_ver=%llu\n", |
964 | (unsigned long long) | |
965 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
966 | ceph_osdc_put_request(req); |
967 | } | |
968 | return ret; | |
969 | ||
970 | done_err: | |
971 | bio_chain_put(req_data->bio); | |
972 | ceph_osdc_put_request(req); | |
973 | done_pages: | |
1fec7093 | 974 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 975 | kfree(req_data); |
602adf40 YS |
976 | return ret; |
977 | } | |
978 | ||
979 | /* | |
980 | * Ceph osd op callback | |
981 | */ | |
982 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
983 | { | |
984 | struct rbd_request *req_data = req->r_priv; | |
985 | struct ceph_osd_reply_head *replyhead; | |
986 | struct ceph_osd_op *op; | |
987 | __s32 rc; | |
988 | u64 bytes; | |
989 | int read_op; | |
990 | ||
991 | /* parse reply */ | |
992 | replyhead = msg->front.iov_base; | |
993 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
994 | op = (void *)(replyhead + 1); | |
995 | rc = le32_to_cpu(replyhead->result); | |
996 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 997 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 998 | |
bd919d45 AE |
999 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1000 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1001 | |
1002 | if (rc == -ENOENT && read_op) { | |
1003 | zero_bio_chain(req_data->bio, 0); | |
1004 | rc = 0; | |
1005 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1006 | zero_bio_chain(req_data->bio, bytes); | |
1007 | bytes = req_data->len; | |
1008 | } | |
1009 | ||
1fec7093 | 1010 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1011 | |
1012 | if (req_data->bio) | |
1013 | bio_chain_put(req_data->bio); | |
1014 | ||
1015 | ceph_osdc_put_request(req); | |
1016 | kfree(req_data); | |
1017 | } | |
1018 | ||
59c2be1e YS |
1019 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1020 | { | |
1021 | ceph_osdc_put_request(req); | |
1022 | } | |
1023 | ||
602adf40 YS |
1024 | /* |
1025 | * Do a synchronous ceph osd operation | |
1026 | */ | |
0ce1a794 | 1027 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1028 | struct ceph_snap_context *snapc, |
1029 | u64 snapid, | |
602adf40 | 1030 | int flags, |
913d2fdc | 1031 | struct ceph_osd_req_op *ops, |
aded07ea | 1032 | const char *object_name, |
602adf40 | 1033 | u64 ofs, u64 len, |
59c2be1e YS |
1034 | char *buf, |
1035 | struct ceph_osd_request **linger_req, | |
1036 | u64 *ver) | |
602adf40 YS |
1037 | { |
1038 | int ret; | |
1039 | struct page **pages; | |
1040 | int num_pages; | |
913d2fdc AE |
1041 | |
1042 | BUG_ON(ops == NULL); | |
602adf40 YS |
1043 | |
1044 | num_pages = calc_pages_for(ofs , len); | |
1045 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1046 | if (IS_ERR(pages)) |
1047 | return PTR_ERR(pages); | |
602adf40 | 1048 | |
0ce1a794 | 1049 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1050 | object_name, ofs, len, NULL, |
602adf40 YS |
1051 | pages, num_pages, |
1052 | flags, | |
1053 | ops, | |
1fec7093 | 1054 | NULL, 0, |
59c2be1e YS |
1055 | NULL, |
1056 | linger_req, ver); | |
602adf40 | 1057 | if (ret < 0) |
913d2fdc | 1058 | goto done; |
602adf40 YS |
1059 | |
1060 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1061 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1062 | ||
602adf40 YS |
1063 | done: |
1064 | ceph_release_page_vector(pages, num_pages); | |
1065 | return ret; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Do an asynchronous ceph osd operation | |
1070 | */ | |
1071 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1072 | struct rbd_device *rbd_dev, |
602adf40 YS |
1073 | struct ceph_snap_context *snapc, |
1074 | u64 snapid, | |
d1f57ea6 | 1075 | int opcode, int flags, |
602adf40 | 1076 | u64 ofs, u64 len, |
1fec7093 YS |
1077 | struct bio *bio, |
1078 | struct rbd_req_coll *coll, | |
1079 | int coll_index) | |
602adf40 YS |
1080 | { |
1081 | char *seg_name; | |
1082 | u64 seg_ofs; | |
1083 | u64 seg_len; | |
1084 | int ret; | |
1085 | struct ceph_osd_req_op *ops; | |
1086 | u32 payload_len; | |
1087 | ||
1088 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1089 | if (!seg_name) | |
1090 | return -ENOMEM; | |
1091 | ||
1092 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1093 | rbd_dev->header.object_prefix, |
602adf40 YS |
1094 | ofs, len, |
1095 | seg_name, &seg_ofs); | |
602adf40 YS |
1096 | |
1097 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1098 | ||
57cfc106 AE |
1099 | ret = -ENOMEM; |
1100 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1101 | if (!ops) | |
602adf40 YS |
1102 | goto done; |
1103 | ||
1104 | /* we've taken care of segment sizes earlier when we | |
1105 | cloned the bios. We should never have a segment | |
1106 | truncated at this point */ | |
1107 | BUG_ON(seg_len < len); | |
1108 | ||
1109 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1110 | seg_name, seg_ofs, seg_len, | |
1111 | bio, | |
1112 | NULL, 0, | |
1113 | flags, | |
1114 | ops, | |
1fec7093 | 1115 | coll, coll_index, |
59c2be1e | 1116 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1117 | |
1118 | rbd_destroy_ops(ops); | |
602adf40 YS |
1119 | done: |
1120 | kfree(seg_name); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Request async osd write | |
1126 | */ | |
1127 | static int rbd_req_write(struct request *rq, | |
1128 | struct rbd_device *rbd_dev, | |
1129 | struct ceph_snap_context *snapc, | |
1130 | u64 ofs, u64 len, | |
1fec7093 YS |
1131 | struct bio *bio, |
1132 | struct rbd_req_coll *coll, | |
1133 | int coll_index) | |
602adf40 YS |
1134 | { |
1135 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1136 | CEPH_OSD_OP_WRITE, | |
1137 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1138 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1139 | } |
1140 | ||
1141 | /* | |
1142 | * Request async osd read | |
1143 | */ | |
1144 | static int rbd_req_read(struct request *rq, | |
1145 | struct rbd_device *rbd_dev, | |
1146 | u64 snapid, | |
1147 | u64 ofs, u64 len, | |
1fec7093 YS |
1148 | struct bio *bio, |
1149 | struct rbd_req_coll *coll, | |
1150 | int coll_index) | |
602adf40 YS |
1151 | { |
1152 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1153 | snapid, |
602adf40 YS |
1154 | CEPH_OSD_OP_READ, |
1155 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1156 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1157 | } |
1158 | ||
1159 | /* | |
1160 | * Request sync osd read | |
1161 | */ | |
0ce1a794 | 1162 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1163 | u64 snapid, |
aded07ea | 1164 | const char *object_name, |
602adf40 | 1165 | u64 ofs, u64 len, |
59c2be1e YS |
1166 | char *buf, |
1167 | u64 *ver) | |
602adf40 | 1168 | { |
913d2fdc AE |
1169 | struct ceph_osd_req_op *ops; |
1170 | int ret; | |
1171 | ||
1172 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1173 | if (!ops) | |
1174 | return -ENOMEM; | |
1175 | ||
1176 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1177 | snapid, |
602adf40 | 1178 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1179 | ops, object_name, ofs, len, buf, NULL, ver); |
1180 | rbd_destroy_ops(ops); | |
1181 | ||
1182 | return ret; | |
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 | 1189 | u64 ver, |
7f0a24d8 | 1190 | u64 notify_id) |
59c2be1e YS |
1191 | { |
1192 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1193 | int ret; |
1194 | ||
57cfc106 AE |
1195 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1196 | if (!ops) | |
1197 | return -ENOMEM; | |
59c2be1e | 1198 | |
a71b891b | 1199 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1200 | ops[0].watch.cookie = notify_id; |
1201 | ops[0].watch.flag = 0; | |
1202 | ||
0ce1a794 | 1203 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1204 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1205 | NULL, 0, |
59c2be1e YS |
1206 | CEPH_OSD_FLAG_READ, |
1207 | ops, | |
1fec7093 | 1208 | NULL, 0, |
59c2be1e YS |
1209 | rbd_simple_req_cb, 0, NULL); |
1210 | ||
1211 | rbd_destroy_ops(ops); | |
1212 | return ret; | |
1213 | } | |
1214 | ||
1215 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1216 | { | |
0ce1a794 | 1217 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1218 | u64 hver; |
13143d2d SW |
1219 | int rc; |
1220 | ||
0ce1a794 | 1221 | if (!rbd_dev) |
59c2be1e YS |
1222 | return; |
1223 | ||
bd919d45 AE |
1224 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1225 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1226 | (unsigned int) opcode); | |
1fe5e993 | 1227 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1228 | if (rc) |
f0f8cef5 | 1229 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1230 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1231 | |
7f0a24d8 | 1232 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1233 | } |
1234 | ||
1235 | /* | |
1236 | * Request sync osd watch | |
1237 | */ | |
0e6f322d | 1238 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1239 | { |
1240 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1241 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1242 | int ret; |
59c2be1e | 1243 | |
57cfc106 AE |
1244 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1245 | if (!ops) | |
1246 | return -ENOMEM; | |
59c2be1e YS |
1247 | |
1248 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1249 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1250 | if (ret < 0) |
1251 | goto fail; | |
1252 | ||
0e6f322d | 1253 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1254 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1255 | ops[0].watch.flag = 1; |
1256 | ||
0ce1a794 | 1257 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1258 | CEPH_NOSNAP, |
59c2be1e YS |
1259 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1260 | ops, | |
0e6f322d AE |
1261 | rbd_dev->header_name, |
1262 | 0, 0, NULL, | |
0ce1a794 | 1263 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1264 | |
1265 | if (ret < 0) | |
1266 | goto fail_event; | |
1267 | ||
1268 | rbd_destroy_ops(ops); | |
1269 | return 0; | |
1270 | ||
1271 | fail_event: | |
0ce1a794 AE |
1272 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1273 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1274 | fail: |
1275 | rbd_destroy_ops(ops); | |
1276 | return ret; | |
1277 | } | |
1278 | ||
79e3057c YS |
1279 | /* |
1280 | * Request sync osd unwatch | |
1281 | */ | |
070c633f | 1282 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1283 | { |
1284 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1285 | int ret; |
79e3057c | 1286 | |
57cfc106 AE |
1287 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1288 | if (!ops) | |
1289 | return -ENOMEM; | |
79e3057c YS |
1290 | |
1291 | ops[0].watch.ver = 0; | |
0ce1a794 | 1292 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1293 | ops[0].watch.flag = 0; |
1294 | ||
0ce1a794 | 1295 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1296 | CEPH_NOSNAP, |
79e3057c YS |
1297 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1298 | ops, | |
070c633f AE |
1299 | rbd_dev->header_name, |
1300 | 0, 0, NULL, NULL, NULL); | |
1301 | ||
79e3057c YS |
1302 | |
1303 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1304 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1305 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1306 | return ret; |
1307 | } | |
1308 | ||
59c2be1e | 1309 | struct rbd_notify_info { |
0ce1a794 | 1310 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1311 | }; |
1312 | ||
1313 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1314 | { | |
0ce1a794 AE |
1315 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1316 | if (!rbd_dev) | |
59c2be1e YS |
1317 | return; |
1318 | ||
bd919d45 AE |
1319 | dout("rbd_notify_cb %s notify_id=%llu opcode=%u\n", |
1320 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1321 | (unsigned int) opcode); | |
59c2be1e YS |
1322 | } |
1323 | ||
1324 | /* | |
1325 | * Request sync osd notify | |
1326 | */ | |
4cb16250 | 1327 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev) |
59c2be1e YS |
1328 | { |
1329 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1330 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1331 | struct ceph_osd_event *event; |
1332 | struct rbd_notify_info info; | |
1333 | int payload_len = sizeof(u32) + sizeof(u32); | |
1334 | int ret; | |
1335 | ||
57cfc106 AE |
1336 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len); |
1337 | if (!ops) | |
1338 | return -ENOMEM; | |
59c2be1e | 1339 | |
0ce1a794 | 1340 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1341 | |
1342 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1343 | (void *)&info, &event); | |
1344 | if (ret < 0) | |
1345 | goto fail; | |
1346 | ||
1347 | ops[0].watch.ver = 1; | |
1348 | ops[0].watch.flag = 1; | |
1349 | ops[0].watch.cookie = event->cookie; | |
1350 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1351 | ops[0].watch.timeout = 12; | |
1352 | ||
0ce1a794 | 1353 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1354 | CEPH_NOSNAP, |
59c2be1e YS |
1355 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1356 | ops, | |
4cb16250 AE |
1357 | rbd_dev->header_name, |
1358 | 0, 0, NULL, NULL, NULL); | |
59c2be1e YS |
1359 | if (ret < 0) |
1360 | goto fail_event; | |
1361 | ||
1362 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1363 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1364 | rbd_destroy_ops(ops); | |
1365 | return 0; | |
1366 | ||
1367 | fail_event: | |
1368 | ceph_osdc_cancel_event(event); | |
1369 | fail: | |
1370 | rbd_destroy_ops(ops); | |
1371 | return ret; | |
1372 | } | |
1373 | ||
602adf40 YS |
1374 | /* |
1375 | * Request sync osd read | |
1376 | */ | |
0ce1a794 | 1377 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1378 | const char *object_name, |
1379 | const char *class_name, | |
1380 | const char *method_name, | |
602adf40 | 1381 | const char *data, |
59c2be1e YS |
1382 | int len, |
1383 | u64 *ver) | |
602adf40 YS |
1384 | { |
1385 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1386 | int class_name_len = strlen(class_name); |
1387 | int method_name_len = strlen(method_name); | |
57cfc106 AE |
1388 | int ret; |
1389 | ||
1390 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, | |
aded07ea | 1391 | class_name_len + method_name_len + len); |
57cfc106 AE |
1392 | if (!ops) |
1393 | return -ENOMEM; | |
602adf40 | 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 | 1404 | CEPH_NOSNAP, |
602adf40 YS |
1405 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1406 | ops, | |
d1f57ea6 | 1407 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1408 | |
1409 | rbd_destroy_ops(ops); | |
1410 | ||
1411 | dout("cls_exec returned %d\n", ret); | |
1412 | return ret; | |
1413 | } | |
1414 | ||
1fec7093 YS |
1415 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1416 | { | |
1417 | struct rbd_req_coll *coll = | |
1418 | kzalloc(sizeof(struct rbd_req_coll) + | |
1419 | sizeof(struct rbd_req_status) * num_reqs, | |
1420 | GFP_ATOMIC); | |
1421 | ||
1422 | if (!coll) | |
1423 | return NULL; | |
1424 | coll->total = num_reqs; | |
1425 | kref_init(&coll->kref); | |
1426 | return coll; | |
1427 | } | |
1428 | ||
602adf40 YS |
1429 | /* |
1430 | * block device queue callback | |
1431 | */ | |
1432 | static void rbd_rq_fn(struct request_queue *q) | |
1433 | { | |
1434 | struct rbd_device *rbd_dev = q->queuedata; | |
1435 | struct request *rq; | |
1436 | struct bio_pair *bp = NULL; | |
1437 | ||
00f1f36f | 1438 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1439 | struct bio *bio; |
1440 | struct bio *rq_bio, *next_bio = NULL; | |
1441 | bool do_write; | |
bd919d45 AE |
1442 | unsigned int size; |
1443 | u64 op_size = 0; | |
602adf40 | 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", | |
bd919d45 | 1490 | size, (unsigned long long) 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 */ | |
bd919d45 | 1503 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
602adf40 | 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, | |
9a5d690b | 1616 | 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 | ||
ed63f4fd | 1623 | rc = rbd_header_from_disk(header, dh, snap_count); |
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; |
1dbb4399 | 1661 | struct ceph_mon_client *monc; |
602adf40 YS |
1662 | |
1663 | /* we should create a snapshot only if we're pointing at the head */ | |
0ce1a794 | 1664 | if (rbd_dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1665 | return -EINVAL; |
1666 | ||
0ce1a794 AE |
1667 | monc = &rbd_dev->rbd_client->client->monc; |
1668 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
bd919d45 | 1669 | dout("created snapid=%llu\n", (unsigned long long) new_snapid); |
602adf40 YS |
1670 | if (ret < 0) |
1671 | return ret; | |
1672 | ||
1673 | data = kmalloc(name_len + 16, gfp_flags); | |
1674 | if (!data) | |
1675 | return -ENOMEM; | |
1676 | ||
916d4d67 SW |
1677 | p = data; |
1678 | e = data + name_len + 16; | |
602adf40 | 1679 | |
916d4d67 SW |
1680 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1681 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1682 | |
0bed54dc | 1683 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1684 | "rbd", "snap_add", |
d67d4be5 | 1685 | data, p - data, NULL); |
602adf40 | 1686 | |
916d4d67 | 1687 | kfree(data); |
602adf40 | 1688 | |
505cbb9b | 1689 | return ret < 0 ? ret : 0; |
602adf40 YS |
1690 | bad: |
1691 | return -ERANGE; | |
1692 | } | |
1693 | ||
dfc5606d YS |
1694 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1695 | { | |
1696 | struct rbd_snap *snap; | |
a0593290 | 1697 | struct rbd_snap *next; |
dfc5606d | 1698 | |
a0593290 | 1699 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1700 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1701 | } |
1702 | ||
602adf40 YS |
1703 | /* |
1704 | * only read the first part of the ondisk header, without the snaps info | |
1705 | */ | |
b813623a | 1706 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1707 | { |
1708 | int ret; | |
1709 | struct rbd_image_header h; | |
602adf40 YS |
1710 | |
1711 | ret = rbd_read_header(rbd_dev, &h); | |
1712 | if (ret < 0) | |
1713 | return ret; | |
1714 | ||
a51aa0c0 JD |
1715 | down_write(&rbd_dev->header_rwsem); |
1716 | ||
9db4b3e3 | 1717 | /* resized? */ |
474ef7ce JD |
1718 | if (rbd_dev->snap_id == CEPH_NOSNAP) { |
1719 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; | |
1720 | ||
1721 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1722 | set_capacity(rbd_dev->disk, size); | |
1723 | } | |
9db4b3e3 | 1724 | |
849b4260 | 1725 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1726 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1727 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1728 | /* osd requests may still refer to snapc */ |
1729 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1730 | |
b813623a AE |
1731 | if (hver) |
1732 | *hver = h.obj_version; | |
a71b891b | 1733 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1734 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1735 | rbd_dev->header.total_snaps = h.total_snaps; |
1736 | rbd_dev->header.snapc = h.snapc; | |
1737 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1738 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1739 | rbd_dev->header.snap_sizes = h.snap_sizes; |
849b4260 AE |
1740 | /* Free the extra copy of the object prefix */ |
1741 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1742 | kfree(h.object_prefix); | |
1743 | ||
dfc5606d YS |
1744 | ret = __rbd_init_snaps_header(rbd_dev); |
1745 | ||
c666601a | 1746 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1747 | |
dfc5606d | 1748 | return ret; |
602adf40 YS |
1749 | } |
1750 | ||
1fe5e993 AE |
1751 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1752 | { | |
1753 | int ret; | |
1754 | ||
1755 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1756 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1757 | mutex_unlock(&ctl_mutex); | |
1758 | ||
1759 | return ret; | |
1760 | } | |
1761 | ||
602adf40 YS |
1762 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1763 | { | |
1764 | struct gendisk *disk; | |
1765 | struct request_queue *q; | |
1766 | int rc; | |
593a9e7b | 1767 | u64 segment_size; |
602adf40 YS |
1768 | u64 total_size = 0; |
1769 | ||
1770 | /* contact OSD, request size info about the object being mapped */ | |
1771 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1772 | if (rc) | |
1773 | return rc; | |
1774 | ||
dfc5606d YS |
1775 | /* no need to lock here, as rbd_dev is not registered yet */ |
1776 | rc = __rbd_init_snaps_header(rbd_dev); | |
1777 | if (rc) | |
1778 | return rc; | |
1779 | ||
cc9d734c | 1780 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1781 | if (rc) |
1782 | return rc; | |
1783 | ||
1784 | /* create gendisk info */ | |
1785 | rc = -ENOMEM; | |
1786 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1787 | if (!disk) | |
1788 | goto out; | |
1789 | ||
f0f8cef5 | 1790 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1791 | rbd_dev->dev_id); |
602adf40 YS |
1792 | disk->major = rbd_dev->major; |
1793 | disk->first_minor = 0; | |
1794 | disk->fops = &rbd_bd_ops; | |
1795 | disk->private_data = rbd_dev; | |
1796 | ||
1797 | /* init rq */ | |
1798 | rc = -ENOMEM; | |
1799 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1800 | if (!q) | |
1801 | goto out_disk; | |
029bcbd8 | 1802 | |
593a9e7b AE |
1803 | /* We use the default size, but let's be explicit about it. */ |
1804 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1805 | ||
029bcbd8 | 1806 | /* set io sizes to object size */ |
593a9e7b AE |
1807 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1808 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1809 | blk_queue_max_segment_size(q, segment_size); | |
1810 | blk_queue_io_min(q, segment_size); | |
1811 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1812 | |
602adf40 YS |
1813 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1814 | disk->queue = q; | |
1815 | ||
1816 | q->queuedata = rbd_dev; | |
1817 | ||
1818 | rbd_dev->disk = disk; | |
1819 | rbd_dev->q = q; | |
1820 | ||
1821 | /* finally, announce the disk to the world */ | |
593a9e7b | 1822 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1823 | add_disk(disk); |
1824 | ||
1825 | pr_info("%s: added with size 0x%llx\n", | |
1826 | disk->disk_name, (unsigned long long)total_size); | |
1827 | return 0; | |
1828 | ||
1829 | out_disk: | |
1830 | put_disk(disk); | |
1831 | out: | |
1832 | return rc; | |
1833 | } | |
1834 | ||
dfc5606d YS |
1835 | /* |
1836 | sysfs | |
1837 | */ | |
1838 | ||
593a9e7b AE |
1839 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1840 | { | |
1841 | return container_of(dev, struct rbd_device, dev); | |
1842 | } | |
1843 | ||
dfc5606d YS |
1844 | static ssize_t rbd_size_show(struct device *dev, |
1845 | struct device_attribute *attr, char *buf) | |
1846 | { | |
593a9e7b | 1847 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1848 | sector_t size; |
1849 | ||
1850 | down_read(&rbd_dev->header_rwsem); | |
1851 | size = get_capacity(rbd_dev->disk); | |
1852 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1853 | |
a51aa0c0 | 1854 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1855 | } |
1856 | ||
1857 | static ssize_t rbd_major_show(struct device *dev, | |
1858 | struct device_attribute *attr, char *buf) | |
1859 | { | |
593a9e7b | 1860 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1861 | |
dfc5606d YS |
1862 | return sprintf(buf, "%d\n", rbd_dev->major); |
1863 | } | |
1864 | ||
1865 | static ssize_t rbd_client_id_show(struct device *dev, | |
1866 | struct device_attribute *attr, char *buf) | |
602adf40 | 1867 | { |
593a9e7b | 1868 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1869 | |
1dbb4399 AE |
1870 | return sprintf(buf, "client%lld\n", |
1871 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1872 | } |
1873 | ||
dfc5606d YS |
1874 | static ssize_t rbd_pool_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 YS |
1878 | |
1879 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1880 | } | |
1881 | ||
9bb2f334 AE |
1882 | static ssize_t rbd_pool_id_show(struct device *dev, |
1883 | struct device_attribute *attr, char *buf) | |
1884 | { | |
1885 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1886 | ||
1887 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1888 | } | |
1889 | ||
dfc5606d YS |
1890 | static ssize_t rbd_name_show(struct device *dev, |
1891 | struct device_attribute *attr, char *buf) | |
1892 | { | |
593a9e7b | 1893 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1894 | |
0bed54dc | 1895 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
1896 | } |
1897 | ||
1898 | static ssize_t rbd_snap_show(struct device *dev, | |
1899 | struct device_attribute *attr, | |
1900 | char *buf) | |
1901 | { | |
593a9e7b | 1902 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1903 | |
1904 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1905 | } | |
1906 | ||
1907 | static ssize_t rbd_image_refresh(struct device *dev, | |
1908 | struct device_attribute *attr, | |
1909 | const char *buf, | |
1910 | size_t size) | |
1911 | { | |
593a9e7b | 1912 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 1913 | int ret; |
602adf40 | 1914 | |
1fe5e993 | 1915 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
1916 | |
1917 | return ret < 0 ? ret : size; | |
dfc5606d | 1918 | } |
602adf40 | 1919 | |
dfc5606d YS |
1920 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1921 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1922 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1923 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1924 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1925 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1926 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1927 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1928 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1929 | |
1930 | static struct attribute *rbd_attrs[] = { | |
1931 | &dev_attr_size.attr, | |
1932 | &dev_attr_major.attr, | |
1933 | &dev_attr_client_id.attr, | |
1934 | &dev_attr_pool.attr, | |
9bb2f334 | 1935 | &dev_attr_pool_id.attr, |
dfc5606d YS |
1936 | &dev_attr_name.attr, |
1937 | &dev_attr_current_snap.attr, | |
1938 | &dev_attr_refresh.attr, | |
1939 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1940 | NULL |
1941 | }; | |
1942 | ||
1943 | static struct attribute_group rbd_attr_group = { | |
1944 | .attrs = rbd_attrs, | |
1945 | }; | |
1946 | ||
1947 | static const struct attribute_group *rbd_attr_groups[] = { | |
1948 | &rbd_attr_group, | |
1949 | NULL | |
1950 | }; | |
1951 | ||
1952 | static void rbd_sysfs_dev_release(struct device *dev) | |
1953 | { | |
1954 | } | |
1955 | ||
1956 | static struct device_type rbd_device_type = { | |
1957 | .name = "rbd", | |
1958 | .groups = rbd_attr_groups, | |
1959 | .release = rbd_sysfs_dev_release, | |
1960 | }; | |
1961 | ||
1962 | ||
1963 | /* | |
1964 | sysfs - snapshots | |
1965 | */ | |
1966 | ||
1967 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1968 | struct device_attribute *attr, | |
1969 | char *buf) | |
1970 | { | |
1971 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1972 | ||
3591538f | 1973 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
1974 | } |
1975 | ||
1976 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1977 | struct device_attribute *attr, | |
1978 | char *buf) | |
1979 | { | |
1980 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1981 | ||
3591538f | 1982 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
1983 | } |
1984 | ||
1985 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1986 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1987 | ||
1988 | static struct attribute *rbd_snap_attrs[] = { | |
1989 | &dev_attr_snap_size.attr, | |
1990 | &dev_attr_snap_id.attr, | |
1991 | NULL, | |
1992 | }; | |
1993 | ||
1994 | static struct attribute_group rbd_snap_attr_group = { | |
1995 | .attrs = rbd_snap_attrs, | |
1996 | }; | |
1997 | ||
1998 | static void rbd_snap_dev_release(struct device *dev) | |
1999 | { | |
2000 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2001 | kfree(snap->name); | |
2002 | kfree(snap); | |
2003 | } | |
2004 | ||
2005 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2006 | &rbd_snap_attr_group, | |
2007 | NULL | |
2008 | }; | |
2009 | ||
2010 | static struct device_type rbd_snap_device_type = { | |
2011 | .groups = rbd_snap_attr_groups, | |
2012 | .release = rbd_snap_dev_release, | |
2013 | }; | |
2014 | ||
14e7085d | 2015 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2016 | { |
2017 | list_del(&snap->node); | |
2018 | device_unregister(&snap->dev); | |
2019 | } | |
2020 | ||
14e7085d | 2021 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2022 | struct device *parent) |
2023 | { | |
2024 | struct device *dev = &snap->dev; | |
2025 | int ret; | |
2026 | ||
2027 | dev->type = &rbd_snap_device_type; | |
2028 | dev->parent = parent; | |
2029 | dev->release = rbd_snap_dev_release; | |
2030 | dev_set_name(dev, "snap_%s", snap->name); | |
2031 | ret = device_register(dev); | |
2032 | ||
2033 | return ret; | |
2034 | } | |
2035 | ||
4e891e0a AE |
2036 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2037 | int i, const char *name) | |
dfc5606d | 2038 | { |
4e891e0a | 2039 | struct rbd_snap *snap; |
dfc5606d | 2040 | int ret; |
4e891e0a AE |
2041 | |
2042 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2043 | if (!snap) |
4e891e0a AE |
2044 | return ERR_PTR(-ENOMEM); |
2045 | ||
2046 | ret = -ENOMEM; | |
dfc5606d | 2047 | snap->name = kstrdup(name, GFP_KERNEL); |
4e891e0a AE |
2048 | if (!snap->name) |
2049 | goto err; | |
2050 | ||
dfc5606d YS |
2051 | snap->size = rbd_dev->header.snap_sizes[i]; |
2052 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2053 | if (device_is_registered(&rbd_dev->dev)) { | |
14e7085d | 2054 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d YS |
2055 | if (ret < 0) |
2056 | goto err; | |
2057 | } | |
4e891e0a AE |
2058 | |
2059 | return snap; | |
2060 | ||
dfc5606d YS |
2061 | err: |
2062 | kfree(snap->name); | |
2063 | kfree(snap); | |
4e891e0a AE |
2064 | |
2065 | return ERR_PTR(ret); | |
dfc5606d YS |
2066 | } |
2067 | ||
2068 | /* | |
2069 | * search for the previous snap in a null delimited string list | |
2070 | */ | |
2071 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
2072 | { | |
2073 | if (name < start + 2) | |
2074 | return NULL; | |
2075 | ||
2076 | name -= 2; | |
2077 | while (*name) { | |
2078 | if (name == start) | |
2079 | return start; | |
2080 | name--; | |
2081 | } | |
2082 | return name + 1; | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * compare the old list of snapshots that we have to what's in the header | |
2087 | * and update it accordingly. Note that the header holds the snapshots | |
2088 | * in a reverse order (from newest to oldest) and we need to go from | |
2089 | * older to new so that we don't get a duplicate snap name when | |
2090 | * doing the process (e.g., removed snapshot and recreated a new | |
2091 | * one with the same name. | |
2092 | */ | |
2093 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2094 | { | |
2095 | const char *name, *first_name; | |
2096 | int i = rbd_dev->header.total_snaps; | |
2097 | struct rbd_snap *snap, *old_snap = NULL; | |
dfc5606d YS |
2098 | struct list_head *p, *n; |
2099 | ||
2100 | first_name = rbd_dev->header.snap_names; | |
2101 | name = first_name + rbd_dev->header.snap_names_len; | |
2102 | ||
2103 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2104 | u64 cur_id; | |
2105 | ||
2106 | old_snap = list_entry(p, struct rbd_snap, node); | |
2107 | ||
2108 | if (i) | |
2109 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2110 | ||
2111 | if (!i || old_snap->id < cur_id) { | |
e88a36ec JD |
2112 | /* |
2113 | * old_snap->id was skipped, thus was | |
2114 | * removed. If this rbd_dev is mapped to | |
2115 | * the removed snapshot, record that it no | |
2116 | * longer exists, to prevent further I/O. | |
2117 | */ | |
2118 | if (rbd_dev->snap_id == old_snap->id) | |
2119 | rbd_dev->snap_exists = false; | |
14e7085d | 2120 | __rbd_remove_snap_dev(old_snap); |
dfc5606d YS |
2121 | continue; |
2122 | } | |
2123 | if (old_snap->id == cur_id) { | |
2124 | /* we have this snapshot already */ | |
2125 | i--; | |
2126 | name = rbd_prev_snap_name(name, first_name); | |
2127 | continue; | |
2128 | } | |
2129 | for (; i > 0; | |
2130 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2131 | if (!name) { | |
2132 | WARN_ON(1); | |
2133 | return -EINVAL; | |
2134 | } | |
2135 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2136 | /* snapshot removal? handle it above */ | |
2137 | if (cur_id >= old_snap->id) | |
2138 | break; | |
2139 | /* a new snapshot */ | |
4e891e0a AE |
2140 | snap = __rbd_add_snap_dev(rbd_dev, i - 1, name); |
2141 | if (IS_ERR(snap)) | |
2142 | return PTR_ERR(snap); | |
dfc5606d YS |
2143 | |
2144 | /* note that we add it backward so using n and not p */ | |
2145 | list_add(&snap->node, n); | |
2146 | p = &snap->node; | |
2147 | } | |
2148 | } | |
2149 | /* we're done going over the old snap list, just add what's left */ | |
2150 | for (; i > 0; i--) { | |
2151 | name = rbd_prev_snap_name(name, first_name); | |
2152 | if (!name) { | |
2153 | WARN_ON(1); | |
2154 | return -EINVAL; | |
2155 | } | |
4e891e0a AE |
2156 | snap = __rbd_add_snap_dev(rbd_dev, i - 1, name); |
2157 | if (IS_ERR(snap)) | |
2158 | return PTR_ERR(snap); | |
dfc5606d YS |
2159 | list_add(&snap->node, &rbd_dev->snaps); |
2160 | } | |
2161 | ||
2162 | return 0; | |
2163 | } | |
2164 | ||
dfc5606d YS |
2165 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2166 | { | |
f0f8cef5 | 2167 | int ret; |
dfc5606d YS |
2168 | struct device *dev; |
2169 | struct rbd_snap *snap; | |
2170 | ||
2171 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2172 | dev = &rbd_dev->dev; | |
2173 | ||
2174 | dev->bus = &rbd_bus_type; | |
2175 | dev->type = &rbd_device_type; | |
2176 | dev->parent = &rbd_root_dev; | |
2177 | dev->release = rbd_dev_release; | |
de71a297 | 2178 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d YS |
2179 | ret = device_register(dev); |
2180 | if (ret < 0) | |
f0f8cef5 | 2181 | goto out; |
dfc5606d YS |
2182 | |
2183 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
14e7085d | 2184 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d | 2185 | if (ret < 0) |
602adf40 YS |
2186 | break; |
2187 | } | |
f0f8cef5 | 2188 | out: |
dfc5606d YS |
2189 | mutex_unlock(&ctl_mutex); |
2190 | return ret; | |
602adf40 YS |
2191 | } |
2192 | ||
dfc5606d YS |
2193 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2194 | { | |
2195 | device_unregister(&rbd_dev->dev); | |
2196 | } | |
2197 | ||
59c2be1e YS |
2198 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2199 | { | |
2200 | int ret, rc; | |
2201 | ||
2202 | do { | |
0e6f322d | 2203 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2204 | if (ret == -ERANGE) { |
1fe5e993 | 2205 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2206 | if (rc < 0) |
2207 | return rc; | |
2208 | } | |
2209 | } while (ret == -ERANGE); | |
2210 | ||
2211 | return ret; | |
2212 | } | |
2213 | ||
1ddbe94e AE |
2214 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2215 | ||
2216 | /* | |
499afd5b AE |
2217 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2218 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2219 | */ |
499afd5b | 2220 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2221 | { |
de71a297 | 2222 | rbd_dev->dev_id = atomic64_inc_return(&rbd_id_max); |
499afd5b AE |
2223 | |
2224 | spin_lock(&rbd_dev_list_lock); | |
2225 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2226 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2227 | } |
b7f23c36 | 2228 | |
1ddbe94e | 2229 | /* |
499afd5b AE |
2230 | * Remove an rbd_dev from the global list, and record that its |
2231 | * identifier is no longer in use. | |
1ddbe94e | 2232 | */ |
499afd5b | 2233 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2234 | { |
d184f6bf | 2235 | struct list_head *tmp; |
de71a297 | 2236 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2237 | int max_id; |
2238 | ||
2239 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2240 | |
2241 | spin_lock(&rbd_dev_list_lock); | |
2242 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2243 | |
2244 | /* | |
2245 | * If the id being "put" is not the current maximum, there | |
2246 | * is nothing special we need to do. | |
2247 | */ | |
2248 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2249 | spin_unlock(&rbd_dev_list_lock); | |
2250 | return; | |
2251 | } | |
2252 | ||
2253 | /* | |
2254 | * We need to update the current maximum id. Search the | |
2255 | * list to find out what it is. We're more likely to find | |
2256 | * the maximum at the end, so search the list backward. | |
2257 | */ | |
2258 | max_id = 0; | |
2259 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2260 | struct rbd_device *rbd_dev; | |
2261 | ||
2262 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2263 | if (rbd_id > max_id) | |
2264 | max_id = rbd_id; | |
2265 | } | |
499afd5b | 2266 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2267 | |
1ddbe94e | 2268 | /* |
d184f6bf AE |
2269 | * The max id could have been updated by rbd_id_get(), in |
2270 | * which case it now accurately reflects the new maximum. | |
2271 | * Be careful not to overwrite the maximum value in that | |
2272 | * case. | |
1ddbe94e | 2273 | */ |
d184f6bf | 2274 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2275 | } |
2276 | ||
e28fff26 AE |
2277 | /* |
2278 | * Skips over white space at *buf, and updates *buf to point to the | |
2279 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2280 | * the token (string of non-white space characters) found. Note |
2281 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2282 | */ |
2283 | static inline size_t next_token(const char **buf) | |
2284 | { | |
2285 | /* | |
2286 | * These are the characters that produce nonzero for | |
2287 | * isspace() in the "C" and "POSIX" locales. | |
2288 | */ | |
2289 | const char *spaces = " \f\n\r\t\v"; | |
2290 | ||
2291 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2292 | ||
2293 | return strcspn(*buf, spaces); /* Return token length */ | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * Finds the next token in *buf, and if the provided token buffer is | |
2298 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2299 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2300 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2301 | * |
2302 | * Returns the length of the token found (not including the '\0'). | |
2303 | * Return value will be 0 if no token is found, and it will be >= | |
2304 | * token_size if the token would not fit. | |
2305 | * | |
593a9e7b | 2306 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2307 | * found token. Note that this occurs even if the token buffer is |
2308 | * too small to hold it. | |
2309 | */ | |
2310 | static inline size_t copy_token(const char **buf, | |
2311 | char *token, | |
2312 | size_t token_size) | |
2313 | { | |
2314 | size_t len; | |
2315 | ||
2316 | len = next_token(buf); | |
2317 | if (len < token_size) { | |
2318 | memcpy(token, *buf, len); | |
2319 | *(token + len) = '\0'; | |
2320 | } | |
2321 | *buf += len; | |
2322 | ||
2323 | return len; | |
2324 | } | |
2325 | ||
ea3352f4 AE |
2326 | /* |
2327 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2328 | * enough to hold a copy of it, and copies the token into the new | |
2329 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2330 | * that a duplicate buffer is created even for a zero-length token. | |
2331 | * | |
2332 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2333 | * pointer if memory for the duplicate was not available. If | |
2334 | * the lenp argument is a non-null pointer, the length of the token | |
2335 | * (not including the '\0') is returned in *lenp. | |
2336 | * | |
2337 | * If successful, the *buf pointer will be updated to point beyond | |
2338 | * the end of the found token. | |
2339 | * | |
2340 | * Note: uses GFP_KERNEL for allocation. | |
2341 | */ | |
2342 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2343 | { | |
2344 | char *dup; | |
2345 | size_t len; | |
2346 | ||
2347 | len = next_token(buf); | |
2348 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2349 | if (!dup) | |
2350 | return NULL; | |
2351 | ||
2352 | memcpy(dup, *buf, len); | |
2353 | *(dup + len) = '\0'; | |
2354 | *buf += len; | |
2355 | ||
2356 | if (lenp) | |
2357 | *lenp = len; | |
2358 | ||
2359 | return dup; | |
2360 | } | |
2361 | ||
a725f65e | 2362 | /* |
0bed54dc | 2363 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2364 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2365 | * on the list of monitor addresses and other options provided via | |
2366 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2367 | * |
2368 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2369 | */ |
2370 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2371 | const char *buf, | |
7ef3214a | 2372 | const char **mon_addrs, |
5214ecc4 | 2373 | size_t *mon_addrs_size, |
e28fff26 | 2374 | char *options, |
0bed54dc | 2375 | size_t options_size) |
e28fff26 | 2376 | { |
d22f76e7 AE |
2377 | size_t len; |
2378 | int ret; | |
e28fff26 AE |
2379 | |
2380 | /* The first four tokens are required */ | |
2381 | ||
7ef3214a AE |
2382 | len = next_token(&buf); |
2383 | if (!len) | |
a725f65e | 2384 | return -EINVAL; |
5214ecc4 | 2385 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2386 | *mon_addrs = buf; |
2387 | ||
2388 | buf += len; | |
a725f65e | 2389 | |
e28fff26 AE |
2390 | len = copy_token(&buf, options, options_size); |
2391 | if (!len || len >= options_size) | |
2392 | return -EINVAL; | |
2393 | ||
bf3e5ae1 | 2394 | ret = -ENOMEM; |
d22f76e7 AE |
2395 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2396 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2397 | goto out_err; |
e28fff26 | 2398 | |
0bed54dc AE |
2399 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2400 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2401 | goto out_err; |
a725f65e | 2402 | |
cb8627c7 AE |
2403 | /* Create the name of the header object */ |
2404 | ||
0bed54dc | 2405 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2406 | + sizeof (RBD_SUFFIX), |
2407 | GFP_KERNEL); | |
0bed54dc | 2408 | if (!rbd_dev->header_name) |
cb8627c7 | 2409 | goto out_err; |
0bed54dc | 2410 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2411 | |
e28fff26 | 2412 | /* |
820a5f3e AE |
2413 | * The snapshot name is optional. If none is is supplied, |
2414 | * we use the default value. | |
e28fff26 | 2415 | */ |
820a5f3e AE |
2416 | rbd_dev->snap_name = dup_token(&buf, &len); |
2417 | if (!rbd_dev->snap_name) | |
2418 | goto out_err; | |
2419 | if (!len) { | |
2420 | /* Replace the empty name with the default */ | |
2421 | kfree(rbd_dev->snap_name); | |
2422 | rbd_dev->snap_name | |
2423 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); | |
2424 | if (!rbd_dev->snap_name) | |
2425 | goto out_err; | |
2426 | ||
e28fff26 AE |
2427 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, |
2428 | sizeof (RBD_SNAP_HEAD_NAME)); | |
849b4260 | 2429 | } |
e28fff26 | 2430 | |
a725f65e | 2431 | return 0; |
d22f76e7 AE |
2432 | |
2433 | out_err: | |
0bed54dc AE |
2434 | kfree(rbd_dev->header_name); |
2435 | kfree(rbd_dev->image_name); | |
d22f76e7 AE |
2436 | kfree(rbd_dev->pool_name); |
2437 | rbd_dev->pool_name = NULL; | |
2438 | ||
2439 | return ret; | |
a725f65e AE |
2440 | } |
2441 | ||
59c2be1e YS |
2442 | static ssize_t rbd_add(struct bus_type *bus, |
2443 | const char *buf, | |
2444 | size_t count) | |
602adf40 | 2445 | { |
cb8627c7 AE |
2446 | char *options; |
2447 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2448 | const char *mon_addrs = NULL; |
2449 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2450 | struct ceph_osd_client *osdc; |
2451 | int rc = -ENOMEM; | |
602adf40 YS |
2452 | |
2453 | if (!try_module_get(THIS_MODULE)) | |
2454 | return -ENODEV; | |
2455 | ||
60571c7d | 2456 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2457 | if (!options) |
27cc2594 | 2458 | goto err_nomem; |
cb8627c7 AE |
2459 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2460 | if (!rbd_dev) | |
2461 | goto err_nomem; | |
602adf40 YS |
2462 | |
2463 | /* static rbd_device initialization */ | |
2464 | spin_lock_init(&rbd_dev->lock); | |
2465 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2466 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2467 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2468 | |
d184f6bf | 2469 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2470 | rbd_id_get(rbd_dev); |
602adf40 | 2471 | |
a725f65e | 2472 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2473 | BUILD_BUG_ON(DEV_NAME_LEN |
2474 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
de71a297 | 2475 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
a725f65e | 2476 | |
602adf40 | 2477 | /* parse add command */ |
7ef3214a | 2478 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2479 | options, count); |
a725f65e | 2480 | if (rc) |
f0f8cef5 | 2481 | goto err_put_id; |
e124a82f | 2482 | |
5214ecc4 AE |
2483 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
2484 | options); | |
d720bcb0 AE |
2485 | if (IS_ERR(rbd_dev->rbd_client)) { |
2486 | rc = PTR_ERR(rbd_dev->rbd_client); | |
f0f8cef5 | 2487 | goto err_put_id; |
d720bcb0 | 2488 | } |
602adf40 | 2489 | |
602adf40 | 2490 | /* pick the pool */ |
1dbb4399 | 2491 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2492 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2493 | if (rc < 0) | |
2494 | goto err_out_client; | |
9bb2f334 | 2495 | rbd_dev->pool_id = rc; |
602adf40 YS |
2496 | |
2497 | /* register our block device */ | |
27cc2594 AE |
2498 | rc = register_blkdev(0, rbd_dev->name); |
2499 | if (rc < 0) | |
602adf40 | 2500 | goto err_out_client; |
27cc2594 | 2501 | rbd_dev->major = rc; |
602adf40 | 2502 | |
dfc5606d YS |
2503 | rc = rbd_bus_add_dev(rbd_dev); |
2504 | if (rc) | |
766fc439 YS |
2505 | goto err_out_blkdev; |
2506 | ||
32eec68d AE |
2507 | /* |
2508 | * At this point cleanup in the event of an error is the job | |
2509 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2510 | * | |
2511 | * Set up and announce blkdev mapping. | |
2512 | */ | |
602adf40 YS |
2513 | rc = rbd_init_disk(rbd_dev); |
2514 | if (rc) | |
766fc439 | 2515 | goto err_out_bus; |
602adf40 | 2516 | |
59c2be1e YS |
2517 | rc = rbd_init_watch_dev(rbd_dev); |
2518 | if (rc) | |
2519 | goto err_out_bus; | |
2520 | ||
602adf40 YS |
2521 | return count; |
2522 | ||
766fc439 | 2523 | err_out_bus: |
766fc439 YS |
2524 | /* this will also clean up rest of rbd_dev stuff */ |
2525 | ||
2526 | rbd_bus_del_dev(rbd_dev); | |
2527 | kfree(options); | |
766fc439 YS |
2528 | return rc; |
2529 | ||
602adf40 YS |
2530 | err_out_blkdev: |
2531 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2532 | err_out_client: | |
2533 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2534 | err_put_id: |
cb8627c7 | 2535 | if (rbd_dev->pool_name) { |
820a5f3e | 2536 | kfree(rbd_dev->snap_name); |
0bed54dc AE |
2537 | kfree(rbd_dev->header_name); |
2538 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2539 | kfree(rbd_dev->pool_name); |
2540 | } | |
499afd5b | 2541 | rbd_id_put(rbd_dev); |
27cc2594 | 2542 | err_nomem: |
27cc2594 | 2543 | kfree(rbd_dev); |
cb8627c7 | 2544 | kfree(options); |
27cc2594 | 2545 | |
602adf40 YS |
2546 | dout("Error adding device %s\n", buf); |
2547 | module_put(THIS_MODULE); | |
27cc2594 AE |
2548 | |
2549 | return (ssize_t) rc; | |
602adf40 YS |
2550 | } |
2551 | ||
de71a297 | 2552 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2553 | { |
2554 | struct list_head *tmp; | |
2555 | struct rbd_device *rbd_dev; | |
2556 | ||
e124a82f | 2557 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2558 | list_for_each(tmp, &rbd_dev_list) { |
2559 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2560 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2561 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2562 | return rbd_dev; |
e124a82f | 2563 | } |
602adf40 | 2564 | } |
e124a82f | 2565 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2566 | return NULL; |
2567 | } | |
2568 | ||
dfc5606d | 2569 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2570 | { |
593a9e7b | 2571 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2572 | |
1dbb4399 AE |
2573 | if (rbd_dev->watch_request) { |
2574 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2575 | ||
2576 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2577 | rbd_dev->watch_request); |
1dbb4399 | 2578 | } |
59c2be1e | 2579 | if (rbd_dev->watch_event) |
070c633f | 2580 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2581 | |
602adf40 YS |
2582 | rbd_put_client(rbd_dev); |
2583 | ||
2584 | /* clean up and free blkdev */ | |
2585 | rbd_free_disk(rbd_dev); | |
2586 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2587 | |
2588 | /* done with the id, and with the rbd_dev */ | |
820a5f3e | 2589 | kfree(rbd_dev->snap_name); |
0bed54dc | 2590 | kfree(rbd_dev->header_name); |
d22f76e7 | 2591 | kfree(rbd_dev->pool_name); |
0bed54dc | 2592 | kfree(rbd_dev->image_name); |
32eec68d | 2593 | rbd_id_put(rbd_dev); |
602adf40 YS |
2594 | kfree(rbd_dev); |
2595 | ||
2596 | /* release module ref */ | |
2597 | module_put(THIS_MODULE); | |
602adf40 YS |
2598 | } |
2599 | ||
dfc5606d YS |
2600 | static ssize_t rbd_remove(struct bus_type *bus, |
2601 | const char *buf, | |
2602 | size_t count) | |
602adf40 YS |
2603 | { |
2604 | struct rbd_device *rbd_dev = NULL; | |
2605 | int target_id, rc; | |
2606 | unsigned long ul; | |
2607 | int ret = count; | |
2608 | ||
2609 | rc = strict_strtoul(buf, 10, &ul); | |
2610 | if (rc) | |
2611 | return rc; | |
2612 | ||
2613 | /* convert to int; abort if we lost anything in the conversion */ | |
2614 | target_id = (int) ul; | |
2615 | if (target_id != ul) | |
2616 | return -EINVAL; | |
2617 | ||
2618 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2619 | ||
2620 | rbd_dev = __rbd_get_dev(target_id); | |
2621 | if (!rbd_dev) { | |
2622 | ret = -ENOENT; | |
2623 | goto done; | |
2624 | } | |
2625 | ||
dfc5606d YS |
2626 | __rbd_remove_all_snaps(rbd_dev); |
2627 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2628 | |
2629 | done: | |
2630 | mutex_unlock(&ctl_mutex); | |
2631 | return ret; | |
2632 | } | |
2633 | ||
dfc5606d YS |
2634 | static ssize_t rbd_snap_add(struct device *dev, |
2635 | struct device_attribute *attr, | |
2636 | const char *buf, | |
2637 | size_t count) | |
602adf40 | 2638 | { |
593a9e7b | 2639 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2640 | int ret; |
2641 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2642 | if (!name) |
2643 | return -ENOMEM; | |
2644 | ||
dfc5606d | 2645 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2646 | |
2647 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2648 | ||
602adf40 YS |
2649 | ret = rbd_header_add_snap(rbd_dev, |
2650 | name, GFP_KERNEL); | |
2651 | if (ret < 0) | |
59c2be1e | 2652 | goto err_unlock; |
602adf40 | 2653 | |
b813623a | 2654 | ret = __rbd_refresh_header(rbd_dev, NULL); |
602adf40 | 2655 | if (ret < 0) |
59c2be1e YS |
2656 | goto err_unlock; |
2657 | ||
2658 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2659 | trigger a watch callback that would need to get that mutex */ | |
2660 | mutex_unlock(&ctl_mutex); | |
2661 | ||
2662 | /* make a best effort, don't error if failed */ | |
4cb16250 | 2663 | rbd_req_sync_notify(rbd_dev); |
602adf40 YS |
2664 | |
2665 | ret = count; | |
59c2be1e YS |
2666 | kfree(name); |
2667 | return ret; | |
2668 | ||
2669 | err_unlock: | |
602adf40 | 2670 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2671 | kfree(name); |
2672 | return ret; | |
2673 | } | |
2674 | ||
602adf40 YS |
2675 | /* |
2676 | * create control files in sysfs | |
dfc5606d | 2677 | * /sys/bus/rbd/... |
602adf40 YS |
2678 | */ |
2679 | static int rbd_sysfs_init(void) | |
2680 | { | |
dfc5606d | 2681 | int ret; |
602adf40 | 2682 | |
fed4c143 | 2683 | ret = device_register(&rbd_root_dev); |
21079786 | 2684 | if (ret < 0) |
dfc5606d | 2685 | return ret; |
602adf40 | 2686 | |
fed4c143 AE |
2687 | ret = bus_register(&rbd_bus_type); |
2688 | if (ret < 0) | |
2689 | device_unregister(&rbd_root_dev); | |
602adf40 | 2690 | |
602adf40 YS |
2691 | return ret; |
2692 | } | |
2693 | ||
2694 | static void rbd_sysfs_cleanup(void) | |
2695 | { | |
dfc5606d | 2696 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2697 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2698 | } |
2699 | ||
2700 | int __init rbd_init(void) | |
2701 | { | |
2702 | int rc; | |
2703 | ||
2704 | rc = rbd_sysfs_init(); | |
2705 | if (rc) | |
2706 | return rc; | |
f0f8cef5 | 2707 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2708 | return 0; |
2709 | } | |
2710 | ||
2711 | void __exit rbd_exit(void) | |
2712 | { | |
2713 | rbd_sysfs_cleanup(); | |
2714 | } | |
2715 | ||
2716 | module_init(rbd_init); | |
2717 | module_exit(rbd_exit); | |
2718 | ||
2719 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2720 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2721 | MODULE_DESCRIPTION("rados block device"); | |
2722 | ||
2723 | /* following authorship retained from original osdblk.c */ | |
2724 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2725 | ||
2726 | MODULE_LICENSE("GPL"); |