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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 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
df111be6 AE |
55 | /* It might be useful to have this defined elsewhere too */ |
56 | ||
57 | #define U64_MAX ((u64) (~0ULL)) | |
58 | ||
f0f8cef5 AE |
59 | #define RBD_DRV_NAME "rbd" |
60 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
61 | |
62 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
63 | ||
602adf40 YS |
64 | #define RBD_MAX_SNAP_NAME_LEN 32 |
65 | #define RBD_MAX_OPT_LEN 1024 | |
66 | ||
67 | #define RBD_SNAP_HEAD_NAME "-" | |
68 | ||
81a89793 AE |
69 | /* |
70 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
71 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
72 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
73 | * enough to hold all possible device names. | |
74 | */ | |
602adf40 | 75 | #define DEV_NAME_LEN 32 |
81a89793 | 76 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 77 | |
cc0538b6 | 78 | #define RBD_READ_ONLY_DEFAULT false |
59c2be1e | 79 | |
602adf40 YS |
80 | /* |
81 | * block device image metadata (in-memory version) | |
82 | */ | |
83 | struct rbd_image_header { | |
f84344f3 | 84 | /* These four fields never change for a given rbd image */ |
849b4260 | 85 | char *object_prefix; |
602adf40 YS |
86 | __u8 obj_order; |
87 | __u8 crypt_type; | |
88 | __u8 comp_type; | |
602adf40 | 89 | |
f84344f3 AE |
90 | /* The remaining fields need to be updated occasionally */ |
91 | u64 image_size; | |
92 | struct ceph_snap_context *snapc; | |
602adf40 YS |
93 | char *snap_names; |
94 | u64 *snap_sizes; | |
59c2be1e YS |
95 | |
96 | u64 obj_version; | |
97 | }; | |
98 | ||
99 | struct rbd_options { | |
cc0538b6 | 100 | bool read_only; |
602adf40 YS |
101 | }; |
102 | ||
103 | /* | |
f0f8cef5 | 104 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
105 | */ |
106 | struct rbd_client { | |
107 | struct ceph_client *client; | |
108 | struct kref kref; | |
109 | struct list_head node; | |
110 | }; | |
111 | ||
112 | /* | |
f0f8cef5 | 113 | * a request completion status |
602adf40 | 114 | */ |
1fec7093 YS |
115 | struct rbd_req_status { |
116 | int done; | |
117 | int rc; | |
118 | u64 bytes; | |
119 | }; | |
120 | ||
121 | /* | |
122 | * a collection of requests | |
123 | */ | |
124 | struct rbd_req_coll { | |
125 | int total; | |
126 | int num_done; | |
127 | struct kref kref; | |
128 | struct rbd_req_status status[0]; | |
602adf40 YS |
129 | }; |
130 | ||
f0f8cef5 AE |
131 | /* |
132 | * a single io request | |
133 | */ | |
134 | struct rbd_request { | |
135 | struct request *rq; /* blk layer request */ | |
136 | struct bio *bio; /* cloned bio */ | |
137 | struct page **pages; /* list of used pages */ | |
138 | u64 len; | |
139 | int coll_index; | |
140 | struct rbd_req_coll *coll; | |
141 | }; | |
142 | ||
dfc5606d YS |
143 | struct rbd_snap { |
144 | struct device dev; | |
145 | const char *name; | |
3591538f | 146 | u64 size; |
dfc5606d YS |
147 | struct list_head node; |
148 | u64 id; | |
149 | }; | |
150 | ||
f84344f3 AE |
151 | struct rbd_mapping { |
152 | char *snap_name; | |
153 | u64 snap_id; | |
154 | bool snap_exists; | |
155 | bool read_only; | |
156 | }; | |
157 | ||
602adf40 YS |
158 | /* |
159 | * a single device | |
160 | */ | |
161 | struct rbd_device { | |
de71a297 | 162 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
163 | |
164 | int major; /* blkdev assigned major */ | |
165 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 166 | |
f8c38929 | 167 | struct rbd_options rbd_opts; |
602adf40 YS |
168 | struct rbd_client *rbd_client; |
169 | ||
170 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
171 | ||
172 | spinlock_t lock; /* queue lock */ | |
173 | ||
174 | struct rbd_image_header header; | |
0bed54dc AE |
175 | char *image_name; |
176 | size_t image_name_len; | |
177 | char *header_name; | |
d22f76e7 | 178 | char *pool_name; |
9bb2f334 | 179 | int pool_id; |
602adf40 | 180 | |
59c2be1e YS |
181 | struct ceph_osd_event *watch_event; |
182 | struct ceph_osd_request *watch_request; | |
183 | ||
c666601a JD |
184 | /* protects updating the header */ |
185 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
186 | |
187 | struct rbd_mapping mapping; | |
602adf40 YS |
188 | |
189 | struct list_head node; | |
dfc5606d YS |
190 | |
191 | /* list of snapshots */ | |
192 | struct list_head snaps; | |
193 | ||
194 | /* sysfs related */ | |
195 | struct device dev; | |
196 | }; | |
197 | ||
602adf40 | 198 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 199 | |
602adf40 | 200 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
201 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
202 | ||
432b8587 AE |
203 | static LIST_HEAD(rbd_client_list); /* clients */ |
204 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 205 | |
9fcbb800 | 206 | static int rbd_dev_snap_devs_update(struct rbd_device *rbd_dev); |
dfc5606d | 207 | static void rbd_dev_release(struct device *dev); |
dfc5606d YS |
208 | static ssize_t rbd_snap_add(struct device *dev, |
209 | struct device_attribute *attr, | |
210 | const char *buf, | |
211 | size_t count); | |
14e7085d | 212 | static void __rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 213 | |
f0f8cef5 AE |
214 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
215 | size_t count); | |
216 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
217 | size_t count); | |
218 | ||
219 | static struct bus_attribute rbd_bus_attrs[] = { | |
220 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
221 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
222 | __ATTR_NULL | |
223 | }; | |
224 | ||
225 | static struct bus_type rbd_bus_type = { | |
226 | .name = "rbd", | |
227 | .bus_attrs = rbd_bus_attrs, | |
228 | }; | |
229 | ||
230 | static void rbd_root_dev_release(struct device *dev) | |
231 | { | |
232 | } | |
233 | ||
234 | static struct device rbd_root_dev = { | |
235 | .init_name = "rbd", | |
236 | .release = rbd_root_dev_release, | |
237 | }; | |
238 | ||
aafb230e AE |
239 | #ifdef RBD_DEBUG |
240 | #define rbd_assert(expr) \ | |
241 | if (unlikely(!(expr))) { \ | |
242 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
243 | "at line %d:\n\n" \ | |
244 | "\trbd_assert(%s);\n\n", \ | |
245 | __func__, __LINE__, #expr); \ | |
246 | BUG(); \ | |
247 | } | |
248 | #else /* !RBD_DEBUG */ | |
249 | # define rbd_assert(expr) ((void) 0) | |
250 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 251 | |
dfc5606d YS |
252 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
253 | { | |
254 | return get_device(&rbd_dev->dev); | |
255 | } | |
256 | ||
257 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
258 | { | |
259 | put_device(&rbd_dev->dev); | |
260 | } | |
602adf40 | 261 | |
1fe5e993 | 262 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); |
59c2be1e | 263 | |
602adf40 YS |
264 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
265 | { | |
f0f8cef5 | 266 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 267 | |
f84344f3 | 268 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
269 | return -EROFS; |
270 | ||
340c7a2b | 271 | rbd_get_dev(rbd_dev); |
f84344f3 | 272 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
340c7a2b | 273 | |
602adf40 YS |
274 | return 0; |
275 | } | |
276 | ||
dfc5606d YS |
277 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
278 | { | |
279 | struct rbd_device *rbd_dev = disk->private_data; | |
280 | ||
281 | rbd_put_dev(rbd_dev); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
602adf40 YS |
286 | static const struct block_device_operations rbd_bd_ops = { |
287 | .owner = THIS_MODULE, | |
288 | .open = rbd_open, | |
dfc5606d | 289 | .release = rbd_release, |
602adf40 YS |
290 | }; |
291 | ||
292 | /* | |
293 | * Initialize an rbd client instance. | |
43ae4701 | 294 | * We own *ceph_opts. |
602adf40 | 295 | */ |
f8c38929 | 296 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
297 | { |
298 | struct rbd_client *rbdc; | |
299 | int ret = -ENOMEM; | |
300 | ||
301 | dout("rbd_client_create\n"); | |
302 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
303 | if (!rbdc) | |
304 | goto out_opt; | |
305 | ||
306 | kref_init(&rbdc->kref); | |
307 | INIT_LIST_HEAD(&rbdc->node); | |
308 | ||
bc534d86 AE |
309 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
310 | ||
43ae4701 | 311 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 312 | if (IS_ERR(rbdc->client)) |
bc534d86 | 313 | goto out_mutex; |
43ae4701 | 314 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
315 | |
316 | ret = ceph_open_session(rbdc->client); | |
317 | if (ret < 0) | |
318 | goto out_err; | |
319 | ||
432b8587 | 320 | spin_lock(&rbd_client_list_lock); |
602adf40 | 321 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 322 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 323 | |
bc534d86 AE |
324 | mutex_unlock(&ctl_mutex); |
325 | ||
602adf40 YS |
326 | dout("rbd_client_create created %p\n", rbdc); |
327 | return rbdc; | |
328 | ||
329 | out_err: | |
330 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
331 | out_mutex: |
332 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
333 | kfree(rbdc); |
334 | out_opt: | |
43ae4701 AE |
335 | if (ceph_opts) |
336 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 337 | return ERR_PTR(ret); |
602adf40 YS |
338 | } |
339 | ||
340 | /* | |
1f7ba331 AE |
341 | * Find a ceph client with specific addr and configuration. If |
342 | * found, bump its reference count. | |
602adf40 | 343 | */ |
1f7ba331 | 344 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
345 | { |
346 | struct rbd_client *client_node; | |
1f7ba331 | 347 | bool found = false; |
602adf40 | 348 | |
43ae4701 | 349 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
350 | return NULL; |
351 | ||
1f7ba331 AE |
352 | spin_lock(&rbd_client_list_lock); |
353 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
354 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
355 | kref_get(&client_node->kref); | |
356 | found = true; | |
357 | break; | |
358 | } | |
359 | } | |
360 | spin_unlock(&rbd_client_list_lock); | |
361 | ||
362 | return found ? client_node : NULL; | |
602adf40 YS |
363 | } |
364 | ||
59c2be1e YS |
365 | /* |
366 | * mount options | |
367 | */ | |
368 | enum { | |
59c2be1e YS |
369 | Opt_last_int, |
370 | /* int args above */ | |
371 | Opt_last_string, | |
372 | /* string args above */ | |
cc0538b6 AE |
373 | Opt_read_only, |
374 | Opt_read_write, | |
375 | /* Boolean args above */ | |
376 | Opt_last_bool, | |
59c2be1e YS |
377 | }; |
378 | ||
43ae4701 | 379 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
380 | /* int args above */ |
381 | /* string args above */ | |
f84344f3 | 382 | {Opt_read_only, "mapping.read_only"}, |
cc0538b6 AE |
383 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
384 | {Opt_read_write, "read_write"}, | |
385 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
386 | /* Boolean args above */ | |
59c2be1e YS |
387 | {-1, NULL} |
388 | }; | |
389 | ||
390 | static int parse_rbd_opts_token(char *c, void *private) | |
391 | { | |
43ae4701 | 392 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
393 | substring_t argstr[MAX_OPT_ARGS]; |
394 | int token, intval, ret; | |
395 | ||
43ae4701 | 396 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
397 | if (token < 0) |
398 | return -EINVAL; | |
399 | ||
400 | if (token < Opt_last_int) { | |
401 | ret = match_int(&argstr[0], &intval); | |
402 | if (ret < 0) { | |
403 | pr_err("bad mount option arg (not int) " | |
404 | "at '%s'\n", c); | |
405 | return ret; | |
406 | } | |
407 | dout("got int token %d val %d\n", token, intval); | |
408 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
409 | dout("got string token %d val %s\n", token, | |
410 | argstr[0].from); | |
cc0538b6 AE |
411 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
412 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
413 | } else { |
414 | dout("got token %d\n", token); | |
415 | } | |
416 | ||
417 | switch (token) { | |
cc0538b6 AE |
418 | case Opt_read_only: |
419 | rbd_opts->read_only = true; | |
420 | break; | |
421 | case Opt_read_write: | |
422 | rbd_opts->read_only = false; | |
423 | break; | |
59c2be1e | 424 | default: |
aafb230e AE |
425 | rbd_assert(false); |
426 | break; | |
59c2be1e YS |
427 | } |
428 | return 0; | |
429 | } | |
430 | ||
602adf40 YS |
431 | /* |
432 | * Get a ceph client with specific addr and configuration, if one does | |
433 | * not exist create it. | |
434 | */ | |
f8c38929 AE |
435 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, |
436 | size_t mon_addr_len, char *options) | |
602adf40 | 437 | { |
f8c38929 | 438 | struct rbd_options *rbd_opts = &rbd_dev->rbd_opts; |
43ae4701 | 439 | struct ceph_options *ceph_opts; |
f8c38929 | 440 | struct rbd_client *rbdc; |
59c2be1e | 441 | |
cc0538b6 | 442 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
602adf40 | 443 | |
43ae4701 AE |
444 | ceph_opts = ceph_parse_options(options, mon_addr, |
445 | mon_addr + mon_addr_len, | |
446 | parse_rbd_opts_token, rbd_opts); | |
f8c38929 AE |
447 | if (IS_ERR(ceph_opts)) |
448 | return PTR_ERR(ceph_opts); | |
602adf40 | 449 | |
1f7ba331 | 450 | rbdc = rbd_client_find(ceph_opts); |
602adf40 | 451 | if (rbdc) { |
602adf40 | 452 | /* using an existing client */ |
43ae4701 | 453 | ceph_destroy_options(ceph_opts); |
f8c38929 AE |
454 | } else { |
455 | rbdc = rbd_client_create(ceph_opts); | |
456 | if (IS_ERR(rbdc)) | |
457 | return PTR_ERR(rbdc); | |
602adf40 | 458 | } |
f8c38929 | 459 | rbd_dev->rbd_client = rbdc; |
602adf40 | 460 | |
f8c38929 | 461 | return 0; |
602adf40 YS |
462 | } |
463 | ||
464 | /* | |
465 | * Destroy ceph client | |
d23a4b3f | 466 | * |
432b8587 | 467 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
468 | */ |
469 | static void rbd_client_release(struct kref *kref) | |
470 | { | |
471 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
472 | ||
473 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 474 | spin_lock(&rbd_client_list_lock); |
602adf40 | 475 | list_del(&rbdc->node); |
cd9d9f5d | 476 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
477 | |
478 | ceph_destroy_client(rbdc->client); | |
479 | kfree(rbdc); | |
480 | } | |
481 | ||
482 | /* | |
483 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
484 | * it. | |
485 | */ | |
486 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
487 | { | |
488 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
489 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
490 | } |
491 | ||
1fec7093 YS |
492 | /* |
493 | * Destroy requests collection | |
494 | */ | |
495 | static void rbd_coll_release(struct kref *kref) | |
496 | { | |
497 | struct rbd_req_coll *coll = | |
498 | container_of(kref, struct rbd_req_coll, kref); | |
499 | ||
500 | dout("rbd_coll_release %p\n", coll); | |
501 | kfree(coll); | |
502 | } | |
602adf40 | 503 | |
8e94af8e AE |
504 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
505 | { | |
103a150f AE |
506 | size_t size; |
507 | u32 snap_count; | |
508 | ||
509 | /* The header has to start with the magic rbd header text */ | |
510 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
511 | return false; | |
512 | ||
513 | /* | |
514 | * The size of a snapshot header has to fit in a size_t, and | |
515 | * that limits the number of snapshots. | |
516 | */ | |
517 | snap_count = le32_to_cpu(ondisk->snap_count); | |
518 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
519 | if (snap_count > size / sizeof (__le64)) | |
520 | return false; | |
521 | ||
522 | /* | |
523 | * Not only that, but the size of the entire the snapshot | |
524 | * header must also be representable in a size_t. | |
525 | */ | |
526 | size -= snap_count * sizeof (__le64); | |
527 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
528 | return false; | |
529 | ||
530 | return true; | |
8e94af8e AE |
531 | } |
532 | ||
602adf40 YS |
533 | /* |
534 | * Create a new header structure, translate header format from the on-disk | |
535 | * header. | |
536 | */ | |
537 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 538 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 539 | { |
ccece235 | 540 | u32 snap_count; |
58c17b0e | 541 | size_t len; |
d2bb24e5 | 542 | size_t size; |
621901d6 | 543 | u32 i; |
602adf40 | 544 | |
6a52325f AE |
545 | memset(header, 0, sizeof (*header)); |
546 | ||
103a150f AE |
547 | snap_count = le32_to_cpu(ondisk->snap_count); |
548 | ||
58c17b0e AE |
549 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
550 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 551 | if (!header->object_prefix) |
602adf40 | 552 | return -ENOMEM; |
58c17b0e AE |
553 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
554 | header->object_prefix[len] = '\0'; | |
00f1f36f | 555 | |
602adf40 | 556 | if (snap_count) { |
f785cc1d AE |
557 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
558 | ||
621901d6 AE |
559 | /* Save a copy of the snapshot names */ |
560 | ||
f785cc1d AE |
561 | if (snap_names_len > (u64) SIZE_MAX) |
562 | return -EIO; | |
563 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 564 | if (!header->snap_names) |
6a52325f | 565 | goto out_err; |
f785cc1d AE |
566 | /* |
567 | * Note that rbd_dev_v1_header_read() guarantees | |
568 | * the ondisk buffer we're working with has | |
569 | * snap_names_len bytes beyond the end of the | |
570 | * snapshot id array, this memcpy() is safe. | |
571 | */ | |
572 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
573 | snap_names_len); | |
6a52325f | 574 | |
621901d6 AE |
575 | /* Record each snapshot's size */ |
576 | ||
d2bb24e5 AE |
577 | size = snap_count * sizeof (*header->snap_sizes); |
578 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 579 | if (!header->snap_sizes) |
6a52325f | 580 | goto out_err; |
621901d6 AE |
581 | for (i = 0; i < snap_count; i++) |
582 | header->snap_sizes[i] = | |
583 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 584 | } else { |
ccece235 | 585 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
586 | header->snap_names = NULL; |
587 | header->snap_sizes = NULL; | |
588 | } | |
849b4260 | 589 | |
602adf40 YS |
590 | header->obj_order = ondisk->options.order; |
591 | header->crypt_type = ondisk->options.crypt_type; | |
592 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 593 | |
621901d6 AE |
594 | /* Allocate and fill in the snapshot context */ |
595 | ||
f84344f3 | 596 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
597 | size = sizeof (struct ceph_snap_context); |
598 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
599 | header->snapc = kzalloc(size, GFP_KERNEL); | |
600 | if (!header->snapc) | |
601 | goto out_err; | |
602adf40 YS |
602 | |
603 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 604 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 605 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
606 | for (i = 0; i < snap_count; i++) |
607 | header->snapc->snaps[i] = | |
608 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
609 | |
610 | return 0; | |
611 | ||
6a52325f | 612 | out_err: |
849b4260 | 613 | kfree(header->snap_sizes); |
ccece235 | 614 | header->snap_sizes = NULL; |
602adf40 | 615 | kfree(header->snap_names); |
ccece235 | 616 | header->snap_names = NULL; |
6a52325f AE |
617 | kfree(header->object_prefix); |
618 | header->object_prefix = NULL; | |
ccece235 | 619 | |
00f1f36f | 620 | return -ENOMEM; |
602adf40 YS |
621 | } |
622 | ||
602adf40 YS |
623 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
624 | u64 *seq, u64 *size) | |
625 | { | |
626 | int i; | |
627 | char *p = header->snap_names; | |
628 | ||
c9aadfe7 AE |
629 | rbd_assert(header->snapc != NULL); |
630 | for (i = 0; i < header->snapc->num_snaps; i++) { | |
00f1f36f | 631 | if (!strcmp(snap_name, p)) { |
602adf40 | 632 | |
00f1f36f | 633 | /* Found it. Pass back its id and/or size */ |
602adf40 | 634 | |
00f1f36f AE |
635 | if (seq) |
636 | *seq = header->snapc->snaps[i]; | |
637 | if (size) | |
638 | *size = header->snap_sizes[i]; | |
639 | return i; | |
640 | } | |
641 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
642 | } | |
643 | return -ENOENT; | |
602adf40 YS |
644 | } |
645 | ||
0ce1a794 | 646 | static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size) |
602adf40 | 647 | { |
78dc447d | 648 | int ret; |
602adf40 | 649 | |
0ce1a794 | 650 | down_write(&rbd_dev->header_rwsem); |
602adf40 | 651 | |
f84344f3 | 652 | if (!memcmp(rbd_dev->mapping.snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 653 | sizeof (RBD_SNAP_HEAD_NAME))) { |
f84344f3 AE |
654 | rbd_dev->mapping.snap_id = CEPH_NOSNAP; |
655 | rbd_dev->mapping.snap_exists = false; | |
656 | rbd_dev->mapping.read_only = rbd_dev->rbd_opts.read_only; | |
602adf40 | 657 | if (size) |
78dc447d | 658 | *size = rbd_dev->header.image_size; |
602adf40 | 659 | } else { |
78dc447d AE |
660 | u64 snap_id = 0; |
661 | ||
f84344f3 AE |
662 | ret = snap_by_name(&rbd_dev->header, |
663 | rbd_dev->mapping.snap_name, | |
78dc447d | 664 | &snap_id, size); |
602adf40 YS |
665 | if (ret < 0) |
666 | goto done; | |
f84344f3 AE |
667 | rbd_dev->mapping.snap_id = snap_id; |
668 | rbd_dev->mapping.snap_exists = true; | |
669 | rbd_dev->mapping.read_only = true; | |
602adf40 YS |
670 | } |
671 | ||
672 | ret = 0; | |
673 | done: | |
0ce1a794 | 674 | up_write(&rbd_dev->header_rwsem); |
602adf40 YS |
675 | return ret; |
676 | } | |
677 | ||
678 | static void rbd_header_free(struct rbd_image_header *header) | |
679 | { | |
849b4260 | 680 | kfree(header->object_prefix); |
d78fd7ae | 681 | header->object_prefix = NULL; |
602adf40 | 682 | kfree(header->snap_sizes); |
d78fd7ae | 683 | header->snap_sizes = NULL; |
849b4260 | 684 | kfree(header->snap_names); |
d78fd7ae | 685 | header->snap_names = NULL; |
d1d25646 | 686 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 687 | header->snapc = NULL; |
602adf40 YS |
688 | } |
689 | ||
65ccfe21 | 690 | static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 691 | { |
65ccfe21 AE |
692 | char *name; |
693 | u64 segment; | |
694 | int ret; | |
602adf40 | 695 | |
65ccfe21 AE |
696 | name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); |
697 | if (!name) | |
698 | return NULL; | |
699 | segment = offset >> rbd_dev->header.obj_order; | |
700 | ret = snprintf(name, RBD_MAX_SEG_NAME_LEN, "%s.%012llx", | |
701 | rbd_dev->header.object_prefix, segment); | |
702 | if (ret < 0 || ret >= RBD_MAX_SEG_NAME_LEN) { | |
703 | pr_err("error formatting segment name for #%llu (%d)\n", | |
704 | segment, ret); | |
705 | kfree(name); | |
706 | name = NULL; | |
707 | } | |
602adf40 | 708 | |
65ccfe21 AE |
709 | return name; |
710 | } | |
602adf40 | 711 | |
65ccfe21 AE |
712 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
713 | { | |
714 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 715 | |
65ccfe21 AE |
716 | return offset & (segment_size - 1); |
717 | } | |
718 | ||
719 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
720 | u64 offset, u64 length) | |
721 | { | |
722 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
723 | ||
724 | offset &= segment_size - 1; | |
725 | ||
aafb230e | 726 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
727 | if (offset + length > segment_size) |
728 | length = segment_size - offset; | |
729 | ||
730 | return length; | |
602adf40 YS |
731 | } |
732 | ||
1fec7093 YS |
733 | static int rbd_get_num_segments(struct rbd_image_header *header, |
734 | u64 ofs, u64 len) | |
735 | { | |
df111be6 AE |
736 | u64 start_seg; |
737 | u64 end_seg; | |
738 | ||
739 | if (!len) | |
740 | return 0; | |
741 | if (len - 1 > U64_MAX - ofs) | |
742 | return -ERANGE; | |
743 | ||
744 | start_seg = ofs >> header->obj_order; | |
745 | end_seg = (ofs + len - 1) >> header->obj_order; | |
746 | ||
1fec7093 YS |
747 | return end_seg - start_seg + 1; |
748 | } | |
749 | ||
029bcbd8 JD |
750 | /* |
751 | * returns the size of an object in the image | |
752 | */ | |
753 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
754 | { | |
755 | return 1 << header->obj_order; | |
756 | } | |
757 | ||
602adf40 YS |
758 | /* |
759 | * bio helpers | |
760 | */ | |
761 | ||
762 | static void bio_chain_put(struct bio *chain) | |
763 | { | |
764 | struct bio *tmp; | |
765 | ||
766 | while (chain) { | |
767 | tmp = chain; | |
768 | chain = chain->bi_next; | |
769 | bio_put(tmp); | |
770 | } | |
771 | } | |
772 | ||
773 | /* | |
774 | * zeros a bio chain, starting at specific offset | |
775 | */ | |
776 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
777 | { | |
778 | struct bio_vec *bv; | |
779 | unsigned long flags; | |
780 | void *buf; | |
781 | int i; | |
782 | int pos = 0; | |
783 | ||
784 | while (chain) { | |
785 | bio_for_each_segment(bv, chain, i) { | |
786 | if (pos + bv->bv_len > start_ofs) { | |
787 | int remainder = max(start_ofs - pos, 0); | |
788 | buf = bvec_kmap_irq(bv, &flags); | |
789 | memset(buf + remainder, 0, | |
790 | bv->bv_len - remainder); | |
85b5aaa6 | 791 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
792 | } |
793 | pos += bv->bv_len; | |
794 | } | |
795 | ||
796 | chain = chain->bi_next; | |
797 | } | |
798 | } | |
799 | ||
800 | /* | |
801 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
802 | * might return a bio_pair that will need to be released. | |
803 | */ | |
804 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
805 | struct bio_pair **bp, | |
806 | int len, gfp_t gfpmask) | |
807 | { | |
542582fc AE |
808 | struct bio *old_chain = *old; |
809 | struct bio *new_chain = NULL; | |
810 | struct bio *tail; | |
602adf40 YS |
811 | int total = 0; |
812 | ||
813 | if (*bp) { | |
814 | bio_pair_release(*bp); | |
815 | *bp = NULL; | |
816 | } | |
817 | ||
818 | while (old_chain && (total < len)) { | |
542582fc AE |
819 | struct bio *tmp; |
820 | ||
602adf40 YS |
821 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); |
822 | if (!tmp) | |
823 | goto err_out; | |
542582fc | 824 | gfpmask &= ~__GFP_WAIT; /* can't wait after the first */ |
602adf40 YS |
825 | |
826 | if (total + old_chain->bi_size > len) { | |
827 | struct bio_pair *bp; | |
828 | ||
829 | /* | |
830 | * this split can only happen with a single paged bio, | |
831 | * split_bio will BUG_ON if this is not the case | |
832 | */ | |
833 | dout("bio_chain_clone split! total=%d remaining=%d" | |
bd919d45 AE |
834 | "bi_size=%u\n", |
835 | total, len - total, old_chain->bi_size); | |
602adf40 YS |
836 | |
837 | /* split the bio. We'll release it either in the next | |
838 | call, or it will have to be released outside */ | |
593a9e7b | 839 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
840 | if (!bp) |
841 | goto err_out; | |
842 | ||
843 | __bio_clone(tmp, &bp->bio1); | |
844 | ||
845 | *next = &bp->bio2; | |
846 | } else { | |
847 | __bio_clone(tmp, old_chain); | |
848 | *next = old_chain->bi_next; | |
849 | } | |
850 | ||
851 | tmp->bi_bdev = NULL; | |
602adf40 | 852 | tmp->bi_next = NULL; |
542582fc | 853 | if (new_chain) |
602adf40 | 854 | tail->bi_next = tmp; |
542582fc AE |
855 | else |
856 | new_chain = tmp; | |
857 | tail = tmp; | |
602adf40 YS |
858 | old_chain = old_chain->bi_next; |
859 | ||
860 | total += tmp->bi_size; | |
861 | } | |
862 | ||
aafb230e | 863 | rbd_assert(total == len); |
602adf40 | 864 | |
602adf40 YS |
865 | *old = old_chain; |
866 | ||
867 | return new_chain; | |
868 | ||
869 | err_out: | |
870 | dout("bio_chain_clone with err\n"); | |
871 | bio_chain_put(new_chain); | |
872 | return NULL; | |
873 | } | |
874 | ||
875 | /* | |
876 | * helpers for osd request op vectors. | |
877 | */ | |
57cfc106 AE |
878 | static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops, |
879 | int opcode, u32 payload_len) | |
602adf40 | 880 | { |
57cfc106 AE |
881 | struct ceph_osd_req_op *ops; |
882 | ||
883 | ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO); | |
884 | if (!ops) | |
885 | return NULL; | |
886 | ||
887 | ops[0].op = opcode; | |
888 | ||
602adf40 YS |
889 | /* |
890 | * op extent offset and length will be set later on | |
891 | * in calc_raw_layout() | |
892 | */ | |
57cfc106 AE |
893 | ops[0].payload_len = payload_len; |
894 | ||
895 | return ops; | |
602adf40 YS |
896 | } |
897 | ||
898 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
899 | { | |
900 | kfree(ops); | |
901 | } | |
902 | ||
1fec7093 YS |
903 | static void rbd_coll_end_req_index(struct request *rq, |
904 | struct rbd_req_coll *coll, | |
905 | int index, | |
906 | int ret, u64 len) | |
907 | { | |
908 | struct request_queue *q; | |
909 | int min, max, i; | |
910 | ||
bd919d45 AE |
911 | dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", |
912 | coll, index, ret, (unsigned long long) len); | |
1fec7093 YS |
913 | |
914 | if (!rq) | |
915 | return; | |
916 | ||
917 | if (!coll) { | |
918 | blk_end_request(rq, ret, len); | |
919 | return; | |
920 | } | |
921 | ||
922 | q = rq->q; | |
923 | ||
924 | spin_lock_irq(q->queue_lock); | |
925 | coll->status[index].done = 1; | |
926 | coll->status[index].rc = ret; | |
927 | coll->status[index].bytes = len; | |
928 | max = min = coll->num_done; | |
929 | while (max < coll->total && coll->status[max].done) | |
930 | max++; | |
931 | ||
932 | for (i = min; i<max; i++) { | |
933 | __blk_end_request(rq, coll->status[i].rc, | |
934 | coll->status[i].bytes); | |
935 | coll->num_done++; | |
936 | kref_put(&coll->kref, rbd_coll_release); | |
937 | } | |
938 | spin_unlock_irq(q->queue_lock); | |
939 | } | |
940 | ||
941 | static void rbd_coll_end_req(struct rbd_request *req, | |
942 | int ret, u64 len) | |
943 | { | |
944 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
945 | } | |
946 | ||
602adf40 YS |
947 | /* |
948 | * Send ceph osd request | |
949 | */ | |
950 | static int rbd_do_request(struct request *rq, | |
0ce1a794 | 951 | struct rbd_device *rbd_dev, |
602adf40 YS |
952 | struct ceph_snap_context *snapc, |
953 | u64 snapid, | |
aded07ea | 954 | const char *object_name, u64 ofs, u64 len, |
602adf40 YS |
955 | struct bio *bio, |
956 | struct page **pages, | |
957 | int num_pages, | |
958 | int flags, | |
959 | struct ceph_osd_req_op *ops, | |
1fec7093 YS |
960 | struct rbd_req_coll *coll, |
961 | int coll_index, | |
602adf40 | 962 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
963 | struct ceph_msg *msg), |
964 | struct ceph_osd_request **linger_req, | |
965 | u64 *ver) | |
602adf40 YS |
966 | { |
967 | struct ceph_osd_request *req; | |
968 | struct ceph_file_layout *layout; | |
969 | int ret; | |
970 | u64 bno; | |
971 | struct timespec mtime = CURRENT_TIME; | |
972 | struct rbd_request *req_data; | |
973 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 974 | struct ceph_osd_client *osdc; |
602adf40 | 975 | |
602adf40 | 976 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
977 | if (!req_data) { |
978 | if (coll) | |
979 | rbd_coll_end_req_index(rq, coll, coll_index, | |
980 | -ENOMEM, len); | |
981 | return -ENOMEM; | |
982 | } | |
983 | ||
984 | if (coll) { | |
985 | req_data->coll = coll; | |
986 | req_data->coll_index = coll_index; | |
987 | } | |
602adf40 | 988 | |
bd919d45 AE |
989 | dout("rbd_do_request object_name=%s ofs=%llu len=%llu\n", object_name, |
990 | (unsigned long long) ofs, (unsigned long long) len); | |
602adf40 | 991 | |
0ce1a794 | 992 | osdc = &rbd_dev->rbd_client->client->osdc; |
1dbb4399 AE |
993 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, |
994 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 995 | if (!req) { |
4ad12621 | 996 | ret = -ENOMEM; |
602adf40 YS |
997 | goto done_pages; |
998 | } | |
999 | ||
1000 | req->r_callback = rbd_cb; | |
1001 | ||
1002 | req_data->rq = rq; | |
1003 | req_data->bio = bio; | |
1004 | req_data->pages = pages; | |
1005 | req_data->len = len; | |
1006 | ||
1007 | req->r_priv = req_data; | |
1008 | ||
1009 | reqhead = req->r_request->front.iov_base; | |
1010 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
1011 | ||
aded07ea | 1012 | strncpy(req->r_oid, object_name, sizeof(req->r_oid)); |
602adf40 YS |
1013 | req->r_oid_len = strlen(req->r_oid); |
1014 | ||
1015 | layout = &req->r_file_layout; | |
1016 | memset(layout, 0, sizeof(*layout)); | |
1017 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
1018 | layout->fl_stripe_count = cpu_to_le32(1); | |
1019 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
0ce1a794 | 1020 | layout->fl_pg_pool = cpu_to_le32(rbd_dev->pool_id); |
1dbb4399 AE |
1021 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
1022 | req, ops); | |
602adf40 YS |
1023 | |
1024 | ceph_osdc_build_request(req, ofs, &len, | |
1025 | ops, | |
1026 | snapc, | |
1027 | &mtime, | |
1028 | req->r_oid, req->r_oid_len); | |
602adf40 | 1029 | |
59c2be1e | 1030 | if (linger_req) { |
1dbb4399 | 1031 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
1032 | *linger_req = req; |
1033 | } | |
1034 | ||
1dbb4399 | 1035 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
1036 | if (ret < 0) |
1037 | goto done_err; | |
1038 | ||
1039 | if (!rbd_cb) { | |
1dbb4399 | 1040 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
1041 | if (ver) |
1042 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
bd919d45 AE |
1043 | dout("reassert_ver=%llu\n", |
1044 | (unsigned long long) | |
1045 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
1046 | ceph_osdc_put_request(req); |
1047 | } | |
1048 | return ret; | |
1049 | ||
1050 | done_err: | |
1051 | bio_chain_put(req_data->bio); | |
1052 | ceph_osdc_put_request(req); | |
1053 | done_pages: | |
1fec7093 | 1054 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 1055 | kfree(req_data); |
602adf40 YS |
1056 | return ret; |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Ceph osd op callback | |
1061 | */ | |
1062 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
1063 | { | |
1064 | struct rbd_request *req_data = req->r_priv; | |
1065 | struct ceph_osd_reply_head *replyhead; | |
1066 | struct ceph_osd_op *op; | |
1067 | __s32 rc; | |
1068 | u64 bytes; | |
1069 | int read_op; | |
1070 | ||
1071 | /* parse reply */ | |
1072 | replyhead = msg->front.iov_base; | |
1073 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
1074 | op = (void *)(replyhead + 1); | |
1075 | rc = le32_to_cpu(replyhead->result); | |
1076 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 1077 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 | 1078 | |
bd919d45 AE |
1079 | dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", |
1080 | (unsigned long long) bytes, read_op, (int) rc); | |
602adf40 YS |
1081 | |
1082 | if (rc == -ENOENT && read_op) { | |
1083 | zero_bio_chain(req_data->bio, 0); | |
1084 | rc = 0; | |
1085 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
1086 | zero_bio_chain(req_data->bio, bytes); | |
1087 | bytes = req_data->len; | |
1088 | } | |
1089 | ||
1fec7093 | 1090 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
1091 | |
1092 | if (req_data->bio) | |
1093 | bio_chain_put(req_data->bio); | |
1094 | ||
1095 | ceph_osdc_put_request(req); | |
1096 | kfree(req_data); | |
1097 | } | |
1098 | ||
59c2be1e YS |
1099 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1100 | { | |
1101 | ceph_osdc_put_request(req); | |
1102 | } | |
1103 | ||
602adf40 YS |
1104 | /* |
1105 | * Do a synchronous ceph osd operation | |
1106 | */ | |
0ce1a794 | 1107 | static int rbd_req_sync_op(struct rbd_device *rbd_dev, |
602adf40 YS |
1108 | struct ceph_snap_context *snapc, |
1109 | u64 snapid, | |
602adf40 | 1110 | int flags, |
913d2fdc | 1111 | struct ceph_osd_req_op *ops, |
aded07ea | 1112 | const char *object_name, |
602adf40 | 1113 | u64 ofs, u64 len, |
59c2be1e YS |
1114 | char *buf, |
1115 | struct ceph_osd_request **linger_req, | |
1116 | u64 *ver) | |
602adf40 YS |
1117 | { |
1118 | int ret; | |
1119 | struct page **pages; | |
1120 | int num_pages; | |
913d2fdc | 1121 | |
aafb230e | 1122 | rbd_assert(ops != NULL); |
602adf40 YS |
1123 | |
1124 | num_pages = calc_pages_for(ofs , len); | |
1125 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1126 | if (IS_ERR(pages)) |
1127 | return PTR_ERR(pages); | |
602adf40 | 1128 | |
0ce1a794 | 1129 | ret = rbd_do_request(NULL, rbd_dev, snapc, snapid, |
aded07ea | 1130 | object_name, ofs, len, NULL, |
602adf40 YS |
1131 | pages, num_pages, |
1132 | flags, | |
1133 | ops, | |
1fec7093 | 1134 | NULL, 0, |
59c2be1e YS |
1135 | NULL, |
1136 | linger_req, ver); | |
602adf40 | 1137 | if (ret < 0) |
913d2fdc | 1138 | goto done; |
602adf40 YS |
1139 | |
1140 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1141 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1142 | ||
602adf40 YS |
1143 | done: |
1144 | ceph_release_page_vector(pages, num_pages); | |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Do an asynchronous ceph osd operation | |
1150 | */ | |
1151 | static int rbd_do_op(struct request *rq, | |
0ce1a794 | 1152 | struct rbd_device *rbd_dev, |
602adf40 YS |
1153 | struct ceph_snap_context *snapc, |
1154 | u64 snapid, | |
d1f57ea6 | 1155 | int opcode, int flags, |
602adf40 | 1156 | u64 ofs, u64 len, |
1fec7093 YS |
1157 | struct bio *bio, |
1158 | struct rbd_req_coll *coll, | |
1159 | int coll_index) | |
602adf40 YS |
1160 | { |
1161 | char *seg_name; | |
1162 | u64 seg_ofs; | |
1163 | u64 seg_len; | |
1164 | int ret; | |
1165 | struct ceph_osd_req_op *ops; | |
1166 | u32 payload_len; | |
1167 | ||
65ccfe21 | 1168 | seg_name = rbd_segment_name(rbd_dev, ofs); |
602adf40 YS |
1169 | if (!seg_name) |
1170 | return -ENOMEM; | |
65ccfe21 AE |
1171 | seg_len = rbd_segment_length(rbd_dev, ofs, len); |
1172 | seg_ofs = rbd_segment_offset(rbd_dev, ofs); | |
602adf40 YS |
1173 | |
1174 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1175 | ||
57cfc106 AE |
1176 | ret = -ENOMEM; |
1177 | ops = rbd_create_rw_ops(1, opcode, payload_len); | |
1178 | if (!ops) | |
602adf40 YS |
1179 | goto done; |
1180 | ||
1181 | /* we've taken care of segment sizes earlier when we | |
1182 | cloned the bios. We should never have a segment | |
1183 | truncated at this point */ | |
aafb230e | 1184 | rbd_assert(seg_len == len); |
602adf40 YS |
1185 | |
1186 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1187 | seg_name, seg_ofs, seg_len, | |
1188 | bio, | |
1189 | NULL, 0, | |
1190 | flags, | |
1191 | ops, | |
1fec7093 | 1192 | coll, coll_index, |
59c2be1e | 1193 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1194 | |
1195 | rbd_destroy_ops(ops); | |
602adf40 YS |
1196 | done: |
1197 | kfree(seg_name); | |
1198 | return ret; | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Request async osd write | |
1203 | */ | |
1204 | static int rbd_req_write(struct request *rq, | |
1205 | struct rbd_device *rbd_dev, | |
1206 | struct ceph_snap_context *snapc, | |
1207 | u64 ofs, u64 len, | |
1fec7093 YS |
1208 | struct bio *bio, |
1209 | struct rbd_req_coll *coll, | |
1210 | int coll_index) | |
602adf40 YS |
1211 | { |
1212 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1213 | CEPH_OSD_OP_WRITE, | |
1214 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1fec7093 | 1215 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1216 | } |
1217 | ||
1218 | /* | |
1219 | * Request async osd read | |
1220 | */ | |
1221 | static int rbd_req_read(struct request *rq, | |
1222 | struct rbd_device *rbd_dev, | |
1223 | u64 snapid, | |
1224 | u64 ofs, u64 len, | |
1fec7093 YS |
1225 | struct bio *bio, |
1226 | struct rbd_req_coll *coll, | |
1227 | int coll_index) | |
602adf40 YS |
1228 | { |
1229 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1230 | snapid, |
602adf40 YS |
1231 | CEPH_OSD_OP_READ, |
1232 | CEPH_OSD_FLAG_READ, | |
1fec7093 | 1233 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Request sync osd read | |
1238 | */ | |
0ce1a794 | 1239 | static int rbd_req_sync_read(struct rbd_device *rbd_dev, |
602adf40 | 1240 | u64 snapid, |
aded07ea | 1241 | const char *object_name, |
602adf40 | 1242 | u64 ofs, u64 len, |
59c2be1e YS |
1243 | char *buf, |
1244 | u64 *ver) | |
602adf40 | 1245 | { |
913d2fdc AE |
1246 | struct ceph_osd_req_op *ops; |
1247 | int ret; | |
1248 | ||
1249 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0); | |
1250 | if (!ops) | |
1251 | return -ENOMEM; | |
1252 | ||
1253 | ret = rbd_req_sync_op(rbd_dev, NULL, | |
b06e6a6b | 1254 | snapid, |
602adf40 | 1255 | CEPH_OSD_FLAG_READ, |
913d2fdc AE |
1256 | ops, object_name, ofs, len, buf, NULL, ver); |
1257 | rbd_destroy_ops(ops); | |
1258 | ||
1259 | return ret; | |
602adf40 YS |
1260 | } |
1261 | ||
1262 | /* | |
59c2be1e YS |
1263 | * Request sync osd watch |
1264 | */ | |
0ce1a794 | 1265 | static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, |
59c2be1e | 1266 | u64 ver, |
7f0a24d8 | 1267 | u64 notify_id) |
59c2be1e YS |
1268 | { |
1269 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1270 | int ret; |
1271 | ||
57cfc106 AE |
1272 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0); |
1273 | if (!ops) | |
1274 | return -ENOMEM; | |
59c2be1e | 1275 | |
a71b891b | 1276 | ops[0].watch.ver = cpu_to_le64(ver); |
59c2be1e YS |
1277 | ops[0].watch.cookie = notify_id; |
1278 | ops[0].watch.flag = 0; | |
1279 | ||
0ce1a794 | 1280 | ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, |
7f0a24d8 | 1281 | rbd_dev->header_name, 0, 0, NULL, |
ad4f232f | 1282 | NULL, 0, |
59c2be1e YS |
1283 | CEPH_OSD_FLAG_READ, |
1284 | ops, | |
1fec7093 | 1285 | NULL, 0, |
59c2be1e YS |
1286 | rbd_simple_req_cb, 0, NULL); |
1287 | ||
1288 | rbd_destroy_ops(ops); | |
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1293 | { | |
0ce1a794 | 1294 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
a71b891b | 1295 | u64 hver; |
13143d2d SW |
1296 | int rc; |
1297 | ||
0ce1a794 | 1298 | if (!rbd_dev) |
59c2be1e YS |
1299 | return; |
1300 | ||
bd919d45 AE |
1301 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
1302 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1303 | (unsigned int) opcode); | |
1fe5e993 | 1304 | rc = rbd_refresh_header(rbd_dev, &hver); |
13143d2d | 1305 | if (rc) |
f0f8cef5 | 1306 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
0ce1a794 | 1307 | " update snaps: %d\n", rbd_dev->major, rc); |
59c2be1e | 1308 | |
7f0a24d8 | 1309 | rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); |
59c2be1e YS |
1310 | } |
1311 | ||
1312 | /* | |
1313 | * Request sync osd watch | |
1314 | */ | |
0e6f322d | 1315 | static int rbd_req_sync_watch(struct rbd_device *rbd_dev) |
59c2be1e YS |
1316 | { |
1317 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1318 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
57cfc106 | 1319 | int ret; |
59c2be1e | 1320 | |
57cfc106 AE |
1321 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1322 | if (!ops) | |
1323 | return -ENOMEM; | |
59c2be1e YS |
1324 | |
1325 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
0ce1a794 | 1326 | (void *)rbd_dev, &rbd_dev->watch_event); |
59c2be1e YS |
1327 | if (ret < 0) |
1328 | goto fail; | |
1329 | ||
0e6f322d | 1330 | ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version); |
0ce1a794 | 1331 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
59c2be1e YS |
1332 | ops[0].watch.flag = 1; |
1333 | ||
0ce1a794 | 1334 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1335 | CEPH_NOSNAP, |
59c2be1e YS |
1336 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1337 | ops, | |
0e6f322d AE |
1338 | rbd_dev->header_name, |
1339 | 0, 0, NULL, | |
0ce1a794 | 1340 | &rbd_dev->watch_request, NULL); |
59c2be1e YS |
1341 | |
1342 | if (ret < 0) | |
1343 | goto fail_event; | |
1344 | ||
1345 | rbd_destroy_ops(ops); | |
1346 | return 0; | |
1347 | ||
1348 | fail_event: | |
0ce1a794 AE |
1349 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1350 | rbd_dev->watch_event = NULL; | |
59c2be1e YS |
1351 | fail: |
1352 | rbd_destroy_ops(ops); | |
1353 | return ret; | |
1354 | } | |
1355 | ||
79e3057c YS |
1356 | /* |
1357 | * Request sync osd unwatch | |
1358 | */ | |
070c633f | 1359 | static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) |
79e3057c YS |
1360 | { |
1361 | struct ceph_osd_req_op *ops; | |
57cfc106 | 1362 | int ret; |
79e3057c | 1363 | |
57cfc106 AE |
1364 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0); |
1365 | if (!ops) | |
1366 | return -ENOMEM; | |
79e3057c YS |
1367 | |
1368 | ops[0].watch.ver = 0; | |
0ce1a794 | 1369 | ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); |
79e3057c YS |
1370 | ops[0].watch.flag = 0; |
1371 | ||
0ce1a794 | 1372 | ret = rbd_req_sync_op(rbd_dev, NULL, |
79e3057c | 1373 | CEPH_NOSNAP, |
79e3057c YS |
1374 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1375 | ops, | |
070c633f AE |
1376 | rbd_dev->header_name, |
1377 | 0, 0, NULL, NULL, NULL); | |
1378 | ||
79e3057c YS |
1379 | |
1380 | rbd_destroy_ops(ops); | |
0ce1a794 AE |
1381 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1382 | rbd_dev->watch_event = NULL; | |
79e3057c YS |
1383 | return ret; |
1384 | } | |
1385 | ||
59c2be1e | 1386 | struct rbd_notify_info { |
0ce1a794 | 1387 | struct rbd_device *rbd_dev; |
59c2be1e YS |
1388 | }; |
1389 | ||
1390 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1391 | { | |
0ce1a794 AE |
1392 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1393 | if (!rbd_dev) | |
59c2be1e YS |
1394 | return; |
1395 | ||
bd919d45 AE |
1396 | dout("rbd_notify_cb %s notify_id=%llu opcode=%u\n", |
1397 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1398 | (unsigned int) opcode); | |
59c2be1e YS |
1399 | } |
1400 | ||
1401 | /* | |
1402 | * Request sync osd notify | |
1403 | */ | |
4cb16250 | 1404 | static int rbd_req_sync_notify(struct rbd_device *rbd_dev) |
59c2be1e YS |
1405 | { |
1406 | struct ceph_osd_req_op *ops; | |
0ce1a794 | 1407 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
59c2be1e YS |
1408 | struct ceph_osd_event *event; |
1409 | struct rbd_notify_info info; | |
1410 | int payload_len = sizeof(u32) + sizeof(u32); | |
1411 | int ret; | |
1412 | ||
57cfc106 AE |
1413 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY, payload_len); |
1414 | if (!ops) | |
1415 | return -ENOMEM; | |
59c2be1e | 1416 | |
0ce1a794 | 1417 | info.rbd_dev = rbd_dev; |
59c2be1e YS |
1418 | |
1419 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1420 | (void *)&info, &event); | |
1421 | if (ret < 0) | |
1422 | goto fail; | |
1423 | ||
1424 | ops[0].watch.ver = 1; | |
1425 | ops[0].watch.flag = 1; | |
1426 | ops[0].watch.cookie = event->cookie; | |
1427 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1428 | ops[0].watch.timeout = 12; | |
1429 | ||
0ce1a794 | 1430 | ret = rbd_req_sync_op(rbd_dev, NULL, |
59c2be1e | 1431 | CEPH_NOSNAP, |
59c2be1e YS |
1432 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1433 | ops, | |
4cb16250 AE |
1434 | rbd_dev->header_name, |
1435 | 0, 0, NULL, NULL, NULL); | |
59c2be1e YS |
1436 | if (ret < 0) |
1437 | goto fail_event; | |
1438 | ||
1439 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1440 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1441 | rbd_destroy_ops(ops); | |
1442 | return 0; | |
1443 | ||
1444 | fail_event: | |
1445 | ceph_osdc_cancel_event(event); | |
1446 | fail: | |
1447 | rbd_destroy_ops(ops); | |
1448 | return ret; | |
1449 | } | |
1450 | ||
602adf40 YS |
1451 | /* |
1452 | * Request sync osd read | |
1453 | */ | |
0ce1a794 | 1454 | static int rbd_req_sync_exec(struct rbd_device *rbd_dev, |
aded07ea AE |
1455 | const char *object_name, |
1456 | const char *class_name, | |
1457 | const char *method_name, | |
602adf40 | 1458 | const char *data, |
59c2be1e YS |
1459 | int len, |
1460 | u64 *ver) | |
602adf40 YS |
1461 | { |
1462 | struct ceph_osd_req_op *ops; | |
aded07ea AE |
1463 | int class_name_len = strlen(class_name); |
1464 | int method_name_len = strlen(method_name); | |
57cfc106 AE |
1465 | int ret; |
1466 | ||
1467 | ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, | |
aded07ea | 1468 | class_name_len + method_name_len + len); |
57cfc106 AE |
1469 | if (!ops) |
1470 | return -ENOMEM; | |
602adf40 | 1471 | |
aded07ea AE |
1472 | ops[0].cls.class_name = class_name; |
1473 | ops[0].cls.class_len = (__u8) class_name_len; | |
1474 | ops[0].cls.method_name = method_name; | |
1475 | ops[0].cls.method_len = (__u8) method_name_len; | |
602adf40 YS |
1476 | ops[0].cls.argc = 0; |
1477 | ops[0].cls.indata = data; | |
1478 | ops[0].cls.indata_len = len; | |
1479 | ||
0ce1a794 | 1480 | ret = rbd_req_sync_op(rbd_dev, NULL, |
602adf40 | 1481 | CEPH_NOSNAP, |
602adf40 YS |
1482 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, |
1483 | ops, | |
d1f57ea6 | 1484 | object_name, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1485 | |
1486 | rbd_destroy_ops(ops); | |
1487 | ||
1488 | dout("cls_exec returned %d\n", ret); | |
1489 | return ret; | |
1490 | } | |
1491 | ||
1fec7093 YS |
1492 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1493 | { | |
1494 | struct rbd_req_coll *coll = | |
1495 | kzalloc(sizeof(struct rbd_req_coll) + | |
1496 | sizeof(struct rbd_req_status) * num_reqs, | |
1497 | GFP_ATOMIC); | |
1498 | ||
1499 | if (!coll) | |
1500 | return NULL; | |
1501 | coll->total = num_reqs; | |
1502 | kref_init(&coll->kref); | |
1503 | return coll; | |
1504 | } | |
1505 | ||
602adf40 YS |
1506 | /* |
1507 | * block device queue callback | |
1508 | */ | |
1509 | static void rbd_rq_fn(struct request_queue *q) | |
1510 | { | |
1511 | struct rbd_device *rbd_dev = q->queuedata; | |
1512 | struct request *rq; | |
1513 | struct bio_pair *bp = NULL; | |
1514 | ||
00f1f36f | 1515 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1516 | struct bio *bio; |
1517 | struct bio *rq_bio, *next_bio = NULL; | |
1518 | bool do_write; | |
bd919d45 AE |
1519 | unsigned int size; |
1520 | u64 op_size = 0; | |
602adf40 | 1521 | u64 ofs; |
1fec7093 YS |
1522 | int num_segs, cur_seg = 0; |
1523 | struct rbd_req_coll *coll; | |
d1d25646 | 1524 | struct ceph_snap_context *snapc; |
602adf40 | 1525 | |
602adf40 YS |
1526 | dout("fetched request\n"); |
1527 | ||
1528 | /* filter out block requests we don't understand */ | |
1529 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1530 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1531 | continue; |
602adf40 YS |
1532 | } |
1533 | ||
1534 | /* deduce our operation (read, write) */ | |
1535 | do_write = (rq_data_dir(rq) == WRITE); | |
1536 | ||
1537 | size = blk_rq_bytes(rq); | |
593a9e7b | 1538 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 | 1539 | rq_bio = rq->bio; |
f84344f3 | 1540 | if (do_write && rbd_dev->mapping.read_only) { |
602adf40 | 1541 | __blk_end_request_all(rq, -EROFS); |
00f1f36f | 1542 | continue; |
602adf40 YS |
1543 | } |
1544 | ||
1545 | spin_unlock_irq(q->queue_lock); | |
1546 | ||
d1d25646 | 1547 | down_read(&rbd_dev->header_rwsem); |
e88a36ec | 1548 | |
f84344f3 AE |
1549 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP && |
1550 | !rbd_dev->mapping.snap_exists) { | |
e88a36ec | 1551 | up_read(&rbd_dev->header_rwsem); |
d1d25646 JD |
1552 | dout("request for non-existent snapshot"); |
1553 | spin_lock_irq(q->queue_lock); | |
1554 | __blk_end_request_all(rq, -ENXIO); | |
1555 | continue; | |
e88a36ec JD |
1556 | } |
1557 | ||
d1d25646 JD |
1558 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1559 | ||
1560 | up_read(&rbd_dev->header_rwsem); | |
1561 | ||
602adf40 YS |
1562 | dout("%s 0x%x bytes at 0x%llx\n", |
1563 | do_write ? "write" : "read", | |
bd919d45 | 1564 | size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1565 | |
1fec7093 | 1566 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
df111be6 AE |
1567 | if (num_segs <= 0) { |
1568 | spin_lock_irq(q->queue_lock); | |
1569 | __blk_end_request_all(rq, num_segs); | |
1570 | ceph_put_snap_context(snapc); | |
1571 | continue; | |
1572 | } | |
1fec7093 YS |
1573 | coll = rbd_alloc_coll(num_segs); |
1574 | if (!coll) { | |
1575 | spin_lock_irq(q->queue_lock); | |
1576 | __blk_end_request_all(rq, -ENOMEM); | |
d1d25646 | 1577 | ceph_put_snap_context(snapc); |
00f1f36f | 1578 | continue; |
1fec7093 YS |
1579 | } |
1580 | ||
602adf40 YS |
1581 | do { |
1582 | /* a bio clone to be passed down to OSD req */ | |
bd919d45 | 1583 | dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt); |
65ccfe21 | 1584 | op_size = rbd_segment_length(rbd_dev, ofs, size); |
1fec7093 | 1585 | kref_get(&coll->kref); |
602adf40 YS |
1586 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1587 | op_size, GFP_ATOMIC); | |
1588 | if (!bio) { | |
1fec7093 YS |
1589 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1590 | -ENOMEM, op_size); | |
1591 | goto next_seg; | |
602adf40 YS |
1592 | } |
1593 | ||
1fec7093 | 1594 | |
602adf40 YS |
1595 | /* init OSD command: write or read */ |
1596 | if (do_write) | |
1597 | rbd_req_write(rq, rbd_dev, | |
d1d25646 | 1598 | snapc, |
602adf40 | 1599 | ofs, |
1fec7093 YS |
1600 | op_size, bio, |
1601 | coll, cur_seg); | |
602adf40 YS |
1602 | else |
1603 | rbd_req_read(rq, rbd_dev, | |
f84344f3 | 1604 | rbd_dev->mapping.snap_id, |
602adf40 | 1605 | ofs, |
1fec7093 YS |
1606 | op_size, bio, |
1607 | coll, cur_seg); | |
602adf40 | 1608 | |
1fec7093 | 1609 | next_seg: |
602adf40 YS |
1610 | size -= op_size; |
1611 | ofs += op_size; | |
1612 | ||
1fec7093 | 1613 | cur_seg++; |
602adf40 YS |
1614 | rq_bio = next_bio; |
1615 | } while (size > 0); | |
1fec7093 | 1616 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1617 | |
1618 | if (bp) | |
1619 | bio_pair_release(bp); | |
602adf40 | 1620 | spin_lock_irq(q->queue_lock); |
d1d25646 JD |
1621 | |
1622 | ceph_put_snap_context(snapc); | |
602adf40 YS |
1623 | } |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1628 | * multiple osd objects. One exception would be with a single page bios, | |
1629 | * which we handle later at bio_chain_clone | |
1630 | */ | |
1631 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1632 | struct bio_vec *bvec) | |
1633 | { | |
1634 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1635 | unsigned int chunk_sectors; |
1636 | sector_t sector; | |
1637 | unsigned int bio_sectors; | |
602adf40 YS |
1638 | int max; |
1639 | ||
593a9e7b AE |
1640 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1641 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1642 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1643 | ||
602adf40 | 1644 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1645 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1646 | if (max < 0) |
1647 | max = 0; /* bio_add cannot handle a negative return */ | |
1648 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1649 | return bvec->bv_len; | |
1650 | return max; | |
1651 | } | |
1652 | ||
1653 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1654 | { | |
1655 | struct gendisk *disk = rbd_dev->disk; | |
1656 | ||
1657 | if (!disk) | |
1658 | return; | |
1659 | ||
1660 | rbd_header_free(&rbd_dev->header); | |
1661 | ||
1662 | if (disk->flags & GENHD_FL_UP) | |
1663 | del_gendisk(disk); | |
1664 | if (disk->queue) | |
1665 | blk_cleanup_queue(disk->queue); | |
1666 | put_disk(disk); | |
1667 | } | |
1668 | ||
1669 | /* | |
4156d998 AE |
1670 | * Read the complete header for the given rbd device. |
1671 | * | |
1672 | * Returns a pointer to a dynamically-allocated buffer containing | |
1673 | * the complete and validated header. Caller can pass the address | |
1674 | * of a variable that will be filled in with the version of the | |
1675 | * header object at the time it was read. | |
1676 | * | |
1677 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 1678 | */ |
4156d998 AE |
1679 | static struct rbd_image_header_ondisk * |
1680 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 1681 | { |
4156d998 | 1682 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 1683 | u32 snap_count = 0; |
4156d998 AE |
1684 | u64 names_size = 0; |
1685 | u32 want_count; | |
1686 | int ret; | |
602adf40 | 1687 | |
00f1f36f | 1688 | /* |
4156d998 AE |
1689 | * The complete header will include an array of its 64-bit |
1690 | * snapshot ids, followed by the names of those snapshots as | |
1691 | * a contiguous block of NUL-terminated strings. Note that | |
1692 | * the number of snapshots could change by the time we read | |
1693 | * it in, in which case we re-read it. | |
00f1f36f | 1694 | */ |
4156d998 AE |
1695 | do { |
1696 | size_t size; | |
1697 | ||
1698 | kfree(ondisk); | |
1699 | ||
1700 | size = sizeof (*ondisk); | |
1701 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
1702 | size += names_size; | |
1703 | ondisk = kmalloc(size, GFP_KERNEL); | |
1704 | if (!ondisk) | |
1705 | return ERR_PTR(-ENOMEM); | |
1706 | ||
1707 | ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP, | |
0bed54dc | 1708 | rbd_dev->header_name, |
4156d998 AE |
1709 | 0, size, |
1710 | (char *) ondisk, version); | |
1711 | ||
1712 | if (ret < 0) | |
1713 | goto out_err; | |
1714 | if (WARN_ON((size_t) ret < size)) { | |
1715 | ret = -ENXIO; | |
1716 | pr_warning("short header read for image %s" | |
1717 | " (want %zd got %d)\n", | |
1718 | rbd_dev->image_name, size, ret); | |
1719 | goto out_err; | |
1720 | } | |
1721 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
1722 | ret = -ENXIO; | |
1723 | pr_warning("invalid header for image %s\n", | |
1724 | rbd_dev->image_name); | |
1725 | goto out_err; | |
81e759fb | 1726 | } |
602adf40 | 1727 | |
4156d998 AE |
1728 | names_size = le64_to_cpu(ondisk->snap_names_len); |
1729 | want_count = snap_count; | |
1730 | snap_count = le32_to_cpu(ondisk->snap_count); | |
1731 | } while (snap_count != want_count); | |
00f1f36f | 1732 | |
4156d998 | 1733 | return ondisk; |
00f1f36f | 1734 | |
4156d998 AE |
1735 | out_err: |
1736 | kfree(ondisk); | |
1737 | ||
1738 | return ERR_PTR(ret); | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * reload the ondisk the header | |
1743 | */ | |
1744 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1745 | struct rbd_image_header *header) | |
1746 | { | |
1747 | struct rbd_image_header_ondisk *ondisk; | |
1748 | u64 ver = 0; | |
1749 | int ret; | |
602adf40 | 1750 | |
4156d998 AE |
1751 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
1752 | if (IS_ERR(ondisk)) | |
1753 | return PTR_ERR(ondisk); | |
1754 | ret = rbd_header_from_disk(header, ondisk); | |
1755 | if (ret >= 0) | |
1756 | header->obj_version = ver; | |
1757 | kfree(ondisk); | |
1758 | ||
1759 | return ret; | |
602adf40 YS |
1760 | } |
1761 | ||
1762 | /* | |
1763 | * create a snapshot | |
1764 | */ | |
0ce1a794 | 1765 | static int rbd_header_add_snap(struct rbd_device *rbd_dev, |
602adf40 YS |
1766 | const char *snap_name, |
1767 | gfp_t gfp_flags) | |
1768 | { | |
1769 | int name_len = strlen(snap_name); | |
1770 | u64 new_snapid; | |
1771 | int ret; | |
916d4d67 | 1772 | void *data, *p, *e; |
1dbb4399 | 1773 | struct ceph_mon_client *monc; |
602adf40 YS |
1774 | |
1775 | /* we should create a snapshot only if we're pointing at the head */ | |
f84344f3 | 1776 | if (rbd_dev->mapping.snap_id != CEPH_NOSNAP) |
602adf40 YS |
1777 | return -EINVAL; |
1778 | ||
0ce1a794 AE |
1779 | monc = &rbd_dev->rbd_client->client->monc; |
1780 | ret = ceph_monc_create_snapid(monc, rbd_dev->pool_id, &new_snapid); | |
bd919d45 | 1781 | dout("created snapid=%llu\n", (unsigned long long) new_snapid); |
602adf40 YS |
1782 | if (ret < 0) |
1783 | return ret; | |
1784 | ||
1785 | data = kmalloc(name_len + 16, gfp_flags); | |
1786 | if (!data) | |
1787 | return -ENOMEM; | |
1788 | ||
916d4d67 SW |
1789 | p = data; |
1790 | e = data + name_len + 16; | |
602adf40 | 1791 | |
916d4d67 SW |
1792 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1793 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 | 1794 | |
0bed54dc | 1795 | ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, |
0ce1a794 | 1796 | "rbd", "snap_add", |
d67d4be5 | 1797 | data, p - data, NULL); |
602adf40 | 1798 | |
916d4d67 | 1799 | kfree(data); |
602adf40 | 1800 | |
505cbb9b | 1801 | return ret < 0 ? ret : 0; |
602adf40 YS |
1802 | bad: |
1803 | return -ERANGE; | |
1804 | } | |
1805 | ||
dfc5606d YS |
1806 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1807 | { | |
1808 | struct rbd_snap *snap; | |
a0593290 | 1809 | struct rbd_snap *next; |
dfc5606d | 1810 | |
a0593290 | 1811 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
14e7085d | 1812 | __rbd_remove_snap_dev(snap); |
dfc5606d YS |
1813 | } |
1814 | ||
602adf40 YS |
1815 | /* |
1816 | * only read the first part of the ondisk header, without the snaps info | |
1817 | */ | |
b813623a | 1818 | static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
1819 | { |
1820 | int ret; | |
1821 | struct rbd_image_header h; | |
602adf40 YS |
1822 | |
1823 | ret = rbd_read_header(rbd_dev, &h); | |
1824 | if (ret < 0) | |
1825 | return ret; | |
1826 | ||
a51aa0c0 JD |
1827 | down_write(&rbd_dev->header_rwsem); |
1828 | ||
9db4b3e3 | 1829 | /* resized? */ |
f84344f3 | 1830 | if (rbd_dev->mapping.snap_id == CEPH_NOSNAP) { |
474ef7ce JD |
1831 | sector_t size = (sector_t) h.image_size / SECTOR_SIZE; |
1832 | ||
1833 | dout("setting size to %llu sectors", (unsigned long long) size); | |
1834 | set_capacity(rbd_dev->disk, size); | |
1835 | } | |
9db4b3e3 | 1836 | |
849b4260 | 1837 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 1838 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 1839 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
1840 | /* osd requests may still refer to snapc */ |
1841 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 1842 | |
b813623a AE |
1843 | if (hver) |
1844 | *hver = h.obj_version; | |
a71b891b | 1845 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 1846 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
1847 | rbd_dev->header.snapc = h.snapc; |
1848 | rbd_dev->header.snap_names = h.snap_names; | |
1849 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
1850 | /* Free the extra copy of the object prefix */ |
1851 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
1852 | kfree(h.object_prefix); | |
1853 | ||
9fcbb800 | 1854 | ret = rbd_dev_snap_devs_update(rbd_dev); |
dfc5606d | 1855 | |
c666601a | 1856 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1857 | |
dfc5606d | 1858 | return ret; |
602adf40 YS |
1859 | } |
1860 | ||
1fe5e993 AE |
1861 | static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) |
1862 | { | |
1863 | int ret; | |
1864 | ||
1865 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1866 | ret = __rbd_refresh_header(rbd_dev, hver); | |
1867 | mutex_unlock(&ctl_mutex); | |
1868 | ||
1869 | return ret; | |
1870 | } | |
1871 | ||
602adf40 YS |
1872 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
1873 | { | |
1874 | struct gendisk *disk; | |
1875 | struct request_queue *q; | |
1876 | int rc; | |
593a9e7b | 1877 | u64 segment_size; |
602adf40 YS |
1878 | u64 total_size = 0; |
1879 | ||
1880 | /* contact OSD, request size info about the object being mapped */ | |
1881 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1882 | if (rc) | |
1883 | return rc; | |
1884 | ||
dfc5606d | 1885 | /* no need to lock here, as rbd_dev is not registered yet */ |
9fcbb800 | 1886 | rc = rbd_dev_snap_devs_update(rbd_dev); |
dfc5606d YS |
1887 | if (rc) |
1888 | return rc; | |
1889 | ||
cc9d734c | 1890 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1891 | if (rc) |
1892 | return rc; | |
1893 | ||
1894 | /* create gendisk info */ | |
1895 | rc = -ENOMEM; | |
1896 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1897 | if (!disk) | |
1898 | goto out; | |
1899 | ||
f0f8cef5 | 1900 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 1901 | rbd_dev->dev_id); |
602adf40 YS |
1902 | disk->major = rbd_dev->major; |
1903 | disk->first_minor = 0; | |
1904 | disk->fops = &rbd_bd_ops; | |
1905 | disk->private_data = rbd_dev; | |
1906 | ||
1907 | /* init rq */ | |
1908 | rc = -ENOMEM; | |
1909 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1910 | if (!q) | |
1911 | goto out_disk; | |
029bcbd8 | 1912 | |
593a9e7b AE |
1913 | /* We use the default size, but let's be explicit about it. */ |
1914 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1915 | ||
029bcbd8 | 1916 | /* set io sizes to object size */ |
593a9e7b AE |
1917 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1918 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1919 | blk_queue_max_segment_size(q, segment_size); | |
1920 | blk_queue_io_min(q, segment_size); | |
1921 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1922 | |
602adf40 YS |
1923 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1924 | disk->queue = q; | |
1925 | ||
1926 | q->queuedata = rbd_dev; | |
1927 | ||
1928 | rbd_dev->disk = disk; | |
602adf40 YS |
1929 | |
1930 | /* finally, announce the disk to the world */ | |
593a9e7b | 1931 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1932 | add_disk(disk); |
1933 | ||
1934 | pr_info("%s: added with size 0x%llx\n", | |
1935 | disk->disk_name, (unsigned long long)total_size); | |
1936 | return 0; | |
1937 | ||
1938 | out_disk: | |
1939 | put_disk(disk); | |
1940 | out: | |
1941 | return rc; | |
1942 | } | |
1943 | ||
dfc5606d YS |
1944 | /* |
1945 | sysfs | |
1946 | */ | |
1947 | ||
593a9e7b AE |
1948 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1949 | { | |
1950 | return container_of(dev, struct rbd_device, dev); | |
1951 | } | |
1952 | ||
dfc5606d YS |
1953 | static ssize_t rbd_size_show(struct device *dev, |
1954 | struct device_attribute *attr, char *buf) | |
1955 | { | |
593a9e7b | 1956 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
1957 | sector_t size; |
1958 | ||
1959 | down_read(&rbd_dev->header_rwsem); | |
1960 | size = get_capacity(rbd_dev->disk); | |
1961 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 1962 | |
a51aa0c0 | 1963 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
1964 | } |
1965 | ||
1966 | static ssize_t rbd_major_show(struct device *dev, | |
1967 | struct device_attribute *attr, char *buf) | |
1968 | { | |
593a9e7b | 1969 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1970 | |
dfc5606d YS |
1971 | return sprintf(buf, "%d\n", rbd_dev->major); |
1972 | } | |
1973 | ||
1974 | static ssize_t rbd_client_id_show(struct device *dev, | |
1975 | struct device_attribute *attr, char *buf) | |
602adf40 | 1976 | { |
593a9e7b | 1977 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1978 | |
1dbb4399 AE |
1979 | return sprintf(buf, "client%lld\n", |
1980 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1981 | } |
1982 | ||
dfc5606d YS |
1983 | static ssize_t rbd_pool_show(struct device *dev, |
1984 | struct device_attribute *attr, char *buf) | |
602adf40 | 1985 | { |
593a9e7b | 1986 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1987 | |
1988 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1989 | } | |
1990 | ||
9bb2f334 AE |
1991 | static ssize_t rbd_pool_id_show(struct device *dev, |
1992 | struct device_attribute *attr, char *buf) | |
1993 | { | |
1994 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1995 | ||
1996 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1997 | } | |
1998 | ||
dfc5606d YS |
1999 | static ssize_t rbd_name_show(struct device *dev, |
2000 | struct device_attribute *attr, char *buf) | |
2001 | { | |
593a9e7b | 2002 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2003 | |
0bed54dc | 2004 | return sprintf(buf, "%s\n", rbd_dev->image_name); |
dfc5606d YS |
2005 | } |
2006 | ||
2007 | static ssize_t rbd_snap_show(struct device *dev, | |
2008 | struct device_attribute *attr, | |
2009 | char *buf) | |
2010 | { | |
593a9e7b | 2011 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2012 | |
f84344f3 | 2013 | return sprintf(buf, "%s\n", rbd_dev->mapping.snap_name); |
dfc5606d YS |
2014 | } |
2015 | ||
2016 | static ssize_t rbd_image_refresh(struct device *dev, | |
2017 | struct device_attribute *attr, | |
2018 | const char *buf, | |
2019 | size_t size) | |
2020 | { | |
593a9e7b | 2021 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 2022 | int ret; |
602adf40 | 2023 | |
1fe5e993 | 2024 | ret = rbd_refresh_header(rbd_dev, NULL); |
b813623a AE |
2025 | |
2026 | return ret < 0 ? ret : size; | |
dfc5606d | 2027 | } |
602adf40 | 2028 | |
dfc5606d YS |
2029 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
2030 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
2031 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
2032 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 2033 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
2034 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
2035 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
2036 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
2037 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
2038 | |
2039 | static struct attribute *rbd_attrs[] = { | |
2040 | &dev_attr_size.attr, | |
2041 | &dev_attr_major.attr, | |
2042 | &dev_attr_client_id.attr, | |
2043 | &dev_attr_pool.attr, | |
9bb2f334 | 2044 | &dev_attr_pool_id.attr, |
dfc5606d YS |
2045 | &dev_attr_name.attr, |
2046 | &dev_attr_current_snap.attr, | |
2047 | &dev_attr_refresh.attr, | |
2048 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
2049 | NULL |
2050 | }; | |
2051 | ||
2052 | static struct attribute_group rbd_attr_group = { | |
2053 | .attrs = rbd_attrs, | |
2054 | }; | |
2055 | ||
2056 | static const struct attribute_group *rbd_attr_groups[] = { | |
2057 | &rbd_attr_group, | |
2058 | NULL | |
2059 | }; | |
2060 | ||
2061 | static void rbd_sysfs_dev_release(struct device *dev) | |
2062 | { | |
2063 | } | |
2064 | ||
2065 | static struct device_type rbd_device_type = { | |
2066 | .name = "rbd", | |
2067 | .groups = rbd_attr_groups, | |
2068 | .release = rbd_sysfs_dev_release, | |
2069 | }; | |
2070 | ||
2071 | ||
2072 | /* | |
2073 | sysfs - snapshots | |
2074 | */ | |
2075 | ||
2076 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2077 | struct device_attribute *attr, | |
2078 | char *buf) | |
2079 | { | |
2080 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2081 | ||
3591538f | 2082 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2083 | } |
2084 | ||
2085 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2086 | struct device_attribute *attr, | |
2087 | char *buf) | |
2088 | { | |
2089 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2090 | ||
3591538f | 2091 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2092 | } |
2093 | ||
2094 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
2095 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
2096 | ||
2097 | static struct attribute *rbd_snap_attrs[] = { | |
2098 | &dev_attr_snap_size.attr, | |
2099 | &dev_attr_snap_id.attr, | |
2100 | NULL, | |
2101 | }; | |
2102 | ||
2103 | static struct attribute_group rbd_snap_attr_group = { | |
2104 | .attrs = rbd_snap_attrs, | |
2105 | }; | |
2106 | ||
2107 | static void rbd_snap_dev_release(struct device *dev) | |
2108 | { | |
2109 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2110 | kfree(snap->name); | |
2111 | kfree(snap); | |
2112 | } | |
2113 | ||
2114 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2115 | &rbd_snap_attr_group, | |
2116 | NULL | |
2117 | }; | |
2118 | ||
2119 | static struct device_type rbd_snap_device_type = { | |
2120 | .groups = rbd_snap_attr_groups, | |
2121 | .release = rbd_snap_dev_release, | |
2122 | }; | |
2123 | ||
14e7085d | 2124 | static void __rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2125 | { |
2126 | list_del(&snap->node); | |
2127 | device_unregister(&snap->dev); | |
2128 | } | |
2129 | ||
14e7085d | 2130 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2131 | struct device *parent) |
2132 | { | |
2133 | struct device *dev = &snap->dev; | |
2134 | int ret; | |
2135 | ||
2136 | dev->type = &rbd_snap_device_type; | |
2137 | dev->parent = parent; | |
2138 | dev->release = rbd_snap_dev_release; | |
2139 | dev_set_name(dev, "snap_%s", snap->name); | |
2140 | ret = device_register(dev); | |
2141 | ||
2142 | return ret; | |
2143 | } | |
2144 | ||
4e891e0a AE |
2145 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2146 | int i, const char *name) | |
dfc5606d | 2147 | { |
4e891e0a | 2148 | struct rbd_snap *snap; |
dfc5606d | 2149 | int ret; |
4e891e0a AE |
2150 | |
2151 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2152 | if (!snap) |
4e891e0a AE |
2153 | return ERR_PTR(-ENOMEM); |
2154 | ||
2155 | ret = -ENOMEM; | |
dfc5606d | 2156 | snap->name = kstrdup(name, GFP_KERNEL); |
4e891e0a AE |
2157 | if (!snap->name) |
2158 | goto err; | |
2159 | ||
dfc5606d YS |
2160 | snap->size = rbd_dev->header.snap_sizes[i]; |
2161 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2162 | if (device_is_registered(&rbd_dev->dev)) { | |
14e7085d | 2163 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d YS |
2164 | if (ret < 0) |
2165 | goto err; | |
2166 | } | |
4e891e0a AE |
2167 | |
2168 | return snap; | |
2169 | ||
dfc5606d YS |
2170 | err: |
2171 | kfree(snap->name); | |
2172 | kfree(snap); | |
4e891e0a AE |
2173 | |
2174 | return ERR_PTR(ret); | |
dfc5606d YS |
2175 | } |
2176 | ||
2177 | /* | |
35938150 AE |
2178 | * Scan the rbd device's current snapshot list and compare it to the |
2179 | * newly-received snapshot context. Remove any existing snapshots | |
2180 | * not present in the new snapshot context. Add a new snapshot for | |
2181 | * any snaphots in the snapshot context not in the current list. | |
2182 | * And verify there are no changes to snapshots we already know | |
2183 | * about. | |
2184 | * | |
2185 | * Assumes the snapshots in the snapshot context are sorted by | |
2186 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
2187 | * are also maintained in that order.) | |
dfc5606d | 2188 | */ |
9fcbb800 | 2189 | static int rbd_dev_snap_devs_update(struct rbd_device *rbd_dev) |
dfc5606d | 2190 | { |
35938150 AE |
2191 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
2192 | const u32 snap_count = snapc->num_snaps; | |
2193 | char *snap_name = rbd_dev->header.snap_names; | |
2194 | struct list_head *head = &rbd_dev->snaps; | |
2195 | struct list_head *links = head->next; | |
2196 | u32 index = 0; | |
dfc5606d | 2197 | |
9fcbb800 | 2198 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
2199 | while (index < snap_count || links != head) { |
2200 | u64 snap_id; | |
2201 | struct rbd_snap *snap; | |
dfc5606d | 2202 | |
35938150 AE |
2203 | snap_id = index < snap_count ? snapc->snaps[index] |
2204 | : CEPH_NOSNAP; | |
2205 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
2206 | : NULL; | |
aafb230e | 2207 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 2208 | |
35938150 AE |
2209 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
2210 | struct list_head *next = links->next; | |
dfc5606d | 2211 | |
35938150 | 2212 | /* Existing snapshot not in the new snap context */ |
dfc5606d | 2213 | |
f84344f3 AE |
2214 | if (rbd_dev->mapping.snap_id == snap->id) |
2215 | rbd_dev->mapping.snap_exists = false; | |
35938150 | 2216 | __rbd_remove_snap_dev(snap); |
9fcbb800 | 2217 | dout("%ssnap id %llu has been removed\n", |
f84344f3 AE |
2218 | rbd_dev->mapping.snap_id == snap->id ? |
2219 | "mapped " : "", | |
9fcbb800 | 2220 | (unsigned long long) snap->id); |
35938150 AE |
2221 | |
2222 | /* Done with this list entry; advance */ | |
2223 | ||
2224 | links = next; | |
dfc5606d YS |
2225 | continue; |
2226 | } | |
35938150 | 2227 | |
9fcbb800 AE |
2228 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
2229 | (unsigned long long) snap_id); | |
35938150 AE |
2230 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
2231 | struct rbd_snap *new_snap; | |
2232 | ||
2233 | /* We haven't seen this snapshot before */ | |
2234 | ||
2235 | new_snap = __rbd_add_snap_dev(rbd_dev, index, | |
2236 | snap_name); | |
9fcbb800 AE |
2237 | if (IS_ERR(new_snap)) { |
2238 | int err = PTR_ERR(new_snap); | |
2239 | ||
2240 | dout(" failed to add dev, error %d\n", err); | |
2241 | ||
2242 | return err; | |
2243 | } | |
35938150 AE |
2244 | |
2245 | /* New goes before existing, or at end of list */ | |
2246 | ||
9fcbb800 | 2247 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
2248 | if (snap) |
2249 | list_add_tail(&new_snap->node, &snap->node); | |
2250 | else | |
523f3258 | 2251 | list_add_tail(&new_snap->node, head); |
35938150 AE |
2252 | } else { |
2253 | /* Already have this one */ | |
2254 | ||
9fcbb800 AE |
2255 | dout(" already present\n"); |
2256 | ||
aafb230e AE |
2257 | rbd_assert(snap->size == |
2258 | rbd_dev->header.snap_sizes[index]); | |
2259 | rbd_assert(!strcmp(snap->name, snap_name)); | |
35938150 AE |
2260 | |
2261 | /* Done with this list entry; advance */ | |
2262 | ||
2263 | links = links->next; | |
dfc5606d | 2264 | } |
35938150 AE |
2265 | |
2266 | /* Advance to the next entry in the snapshot context */ | |
2267 | ||
2268 | index++; | |
2269 | snap_name += strlen(snap_name) + 1; | |
dfc5606d | 2270 | } |
9fcbb800 | 2271 | dout("%s: done\n", __func__); |
dfc5606d YS |
2272 | |
2273 | return 0; | |
2274 | } | |
2275 | ||
dfc5606d YS |
2276 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2277 | { | |
f0f8cef5 | 2278 | int ret; |
dfc5606d YS |
2279 | struct device *dev; |
2280 | struct rbd_snap *snap; | |
2281 | ||
2282 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2283 | dev = &rbd_dev->dev; | |
2284 | ||
2285 | dev->bus = &rbd_bus_type; | |
2286 | dev->type = &rbd_device_type; | |
2287 | dev->parent = &rbd_root_dev; | |
2288 | dev->release = rbd_dev_release; | |
de71a297 | 2289 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d YS |
2290 | ret = device_register(dev); |
2291 | if (ret < 0) | |
f0f8cef5 | 2292 | goto out; |
dfc5606d YS |
2293 | |
2294 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
14e7085d | 2295 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
dfc5606d | 2296 | if (ret < 0) |
602adf40 YS |
2297 | break; |
2298 | } | |
f0f8cef5 | 2299 | out: |
dfc5606d YS |
2300 | mutex_unlock(&ctl_mutex); |
2301 | return ret; | |
602adf40 YS |
2302 | } |
2303 | ||
dfc5606d YS |
2304 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2305 | { | |
2306 | device_unregister(&rbd_dev->dev); | |
2307 | } | |
2308 | ||
59c2be1e YS |
2309 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2310 | { | |
2311 | int ret, rc; | |
2312 | ||
2313 | do { | |
0e6f322d | 2314 | ret = rbd_req_sync_watch(rbd_dev); |
59c2be1e | 2315 | if (ret == -ERANGE) { |
1fe5e993 | 2316 | rc = rbd_refresh_header(rbd_dev, NULL); |
59c2be1e YS |
2317 | if (rc < 0) |
2318 | return rc; | |
2319 | } | |
2320 | } while (ret == -ERANGE); | |
2321 | ||
2322 | return ret; | |
2323 | } | |
2324 | ||
e2839308 | 2325 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
2326 | |
2327 | /* | |
499afd5b AE |
2328 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2329 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2330 | */ |
e2839308 | 2331 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2332 | { |
e2839308 | 2333 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
2334 | |
2335 | spin_lock(&rbd_dev_list_lock); | |
2336 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2337 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
2338 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
2339 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 2340 | } |
b7f23c36 | 2341 | |
1ddbe94e | 2342 | /* |
499afd5b AE |
2343 | * Remove an rbd_dev from the global list, and record that its |
2344 | * identifier is no longer in use. | |
1ddbe94e | 2345 | */ |
e2839308 | 2346 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2347 | { |
d184f6bf | 2348 | struct list_head *tmp; |
de71a297 | 2349 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
2350 | int max_id; |
2351 | ||
aafb230e | 2352 | rbd_assert(rbd_id > 0); |
499afd5b | 2353 | |
e2839308 AE |
2354 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
2355 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
2356 | spin_lock(&rbd_dev_list_lock); |
2357 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2358 | |
2359 | /* | |
2360 | * If the id being "put" is not the current maximum, there | |
2361 | * is nothing special we need to do. | |
2362 | */ | |
e2839308 | 2363 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
2364 | spin_unlock(&rbd_dev_list_lock); |
2365 | return; | |
2366 | } | |
2367 | ||
2368 | /* | |
2369 | * We need to update the current maximum id. Search the | |
2370 | * list to find out what it is. We're more likely to find | |
2371 | * the maximum at the end, so search the list backward. | |
2372 | */ | |
2373 | max_id = 0; | |
2374 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2375 | struct rbd_device *rbd_dev; | |
2376 | ||
2377 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2378 | if (rbd_id > max_id) | |
2379 | max_id = rbd_id; | |
2380 | } | |
499afd5b | 2381 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2382 | |
1ddbe94e | 2383 | /* |
e2839308 | 2384 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
2385 | * which case it now accurately reflects the new maximum. |
2386 | * Be careful not to overwrite the maximum value in that | |
2387 | * case. | |
1ddbe94e | 2388 | */ |
e2839308 AE |
2389 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
2390 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
2391 | } |
2392 | ||
e28fff26 AE |
2393 | /* |
2394 | * Skips over white space at *buf, and updates *buf to point to the | |
2395 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2396 | * the token (string of non-white space characters) found. Note |
2397 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2398 | */ |
2399 | static inline size_t next_token(const char **buf) | |
2400 | { | |
2401 | /* | |
2402 | * These are the characters that produce nonzero for | |
2403 | * isspace() in the "C" and "POSIX" locales. | |
2404 | */ | |
2405 | const char *spaces = " \f\n\r\t\v"; | |
2406 | ||
2407 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2408 | ||
2409 | return strcspn(*buf, spaces); /* Return token length */ | |
2410 | } | |
2411 | ||
2412 | /* | |
2413 | * Finds the next token in *buf, and if the provided token buffer is | |
2414 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2415 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2416 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2417 | * |
2418 | * Returns the length of the token found (not including the '\0'). | |
2419 | * Return value will be 0 if no token is found, and it will be >= | |
2420 | * token_size if the token would not fit. | |
2421 | * | |
593a9e7b | 2422 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2423 | * found token. Note that this occurs even if the token buffer is |
2424 | * too small to hold it. | |
2425 | */ | |
2426 | static inline size_t copy_token(const char **buf, | |
2427 | char *token, | |
2428 | size_t token_size) | |
2429 | { | |
2430 | size_t len; | |
2431 | ||
2432 | len = next_token(buf); | |
2433 | if (len < token_size) { | |
2434 | memcpy(token, *buf, len); | |
2435 | *(token + len) = '\0'; | |
2436 | } | |
2437 | *buf += len; | |
2438 | ||
2439 | return len; | |
2440 | } | |
2441 | ||
ea3352f4 AE |
2442 | /* |
2443 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2444 | * enough to hold a copy of it, and copies the token into the new | |
2445 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2446 | * that a duplicate buffer is created even for a zero-length token. | |
2447 | * | |
2448 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2449 | * pointer if memory for the duplicate was not available. If | |
2450 | * the lenp argument is a non-null pointer, the length of the token | |
2451 | * (not including the '\0') is returned in *lenp. | |
2452 | * | |
2453 | * If successful, the *buf pointer will be updated to point beyond | |
2454 | * the end of the found token. | |
2455 | * | |
2456 | * Note: uses GFP_KERNEL for allocation. | |
2457 | */ | |
2458 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2459 | { | |
2460 | char *dup; | |
2461 | size_t len; | |
2462 | ||
2463 | len = next_token(buf); | |
2464 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2465 | if (!dup) | |
2466 | return NULL; | |
2467 | ||
2468 | memcpy(dup, *buf, len); | |
2469 | *(dup + len) = '\0'; | |
2470 | *buf += len; | |
2471 | ||
2472 | if (lenp) | |
2473 | *lenp = len; | |
2474 | ||
2475 | return dup; | |
2476 | } | |
2477 | ||
a725f65e | 2478 | /* |
0bed54dc | 2479 | * This fills in the pool_name, image_name, image_name_len, snap_name, |
a725f65e AE |
2480 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based |
2481 | * on the list of monitor addresses and other options provided via | |
2482 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2483 | * |
2484 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2485 | */ |
2486 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2487 | const char *buf, | |
7ef3214a | 2488 | const char **mon_addrs, |
5214ecc4 | 2489 | size_t *mon_addrs_size, |
e28fff26 | 2490 | char *options, |
0bed54dc | 2491 | size_t options_size) |
e28fff26 | 2492 | { |
d22f76e7 AE |
2493 | size_t len; |
2494 | int ret; | |
e28fff26 AE |
2495 | |
2496 | /* The first four tokens are required */ | |
2497 | ||
7ef3214a AE |
2498 | len = next_token(&buf); |
2499 | if (!len) | |
a725f65e | 2500 | return -EINVAL; |
5214ecc4 | 2501 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2502 | *mon_addrs = buf; |
2503 | ||
2504 | buf += len; | |
a725f65e | 2505 | |
e28fff26 AE |
2506 | len = copy_token(&buf, options, options_size); |
2507 | if (!len || len >= options_size) | |
2508 | return -EINVAL; | |
2509 | ||
bf3e5ae1 | 2510 | ret = -ENOMEM; |
d22f76e7 AE |
2511 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2512 | if (!rbd_dev->pool_name) | |
d22f76e7 | 2513 | goto out_err; |
e28fff26 | 2514 | |
0bed54dc AE |
2515 | rbd_dev->image_name = dup_token(&buf, &rbd_dev->image_name_len); |
2516 | if (!rbd_dev->image_name) | |
bf3e5ae1 | 2517 | goto out_err; |
a725f65e | 2518 | |
cb8627c7 AE |
2519 | /* Create the name of the header object */ |
2520 | ||
0bed54dc | 2521 | rbd_dev->header_name = kmalloc(rbd_dev->image_name_len |
bf3e5ae1 AE |
2522 | + sizeof (RBD_SUFFIX), |
2523 | GFP_KERNEL); | |
0bed54dc | 2524 | if (!rbd_dev->header_name) |
cb8627c7 | 2525 | goto out_err; |
0bed54dc | 2526 | sprintf(rbd_dev->header_name, "%s%s", rbd_dev->image_name, RBD_SUFFIX); |
a725f65e | 2527 | |
e28fff26 | 2528 | /* |
820a5f3e AE |
2529 | * The snapshot name is optional. If none is is supplied, |
2530 | * we use the default value. | |
e28fff26 | 2531 | */ |
f84344f3 AE |
2532 | rbd_dev->mapping.snap_name = dup_token(&buf, &len); |
2533 | if (!rbd_dev->mapping.snap_name) | |
820a5f3e AE |
2534 | goto out_err; |
2535 | if (!len) { | |
2536 | /* Replace the empty name with the default */ | |
f84344f3 AE |
2537 | kfree(rbd_dev->mapping.snap_name); |
2538 | rbd_dev->mapping.snap_name | |
820a5f3e | 2539 | = kmalloc(sizeof (RBD_SNAP_HEAD_NAME), GFP_KERNEL); |
f84344f3 | 2540 | if (!rbd_dev->mapping.snap_name) |
820a5f3e AE |
2541 | goto out_err; |
2542 | ||
f84344f3 | 2543 | memcpy(rbd_dev->mapping.snap_name, RBD_SNAP_HEAD_NAME, |
e28fff26 | 2544 | sizeof (RBD_SNAP_HEAD_NAME)); |
849b4260 | 2545 | } |
e28fff26 | 2546 | |
a725f65e | 2547 | return 0; |
d22f76e7 AE |
2548 | |
2549 | out_err: | |
0bed54dc | 2550 | kfree(rbd_dev->header_name); |
d78fd7ae | 2551 | rbd_dev->header_name = NULL; |
0bed54dc | 2552 | kfree(rbd_dev->image_name); |
d78fd7ae AE |
2553 | rbd_dev->image_name = NULL; |
2554 | rbd_dev->image_name_len = 0; | |
d22f76e7 AE |
2555 | kfree(rbd_dev->pool_name); |
2556 | rbd_dev->pool_name = NULL; | |
2557 | ||
2558 | return ret; | |
a725f65e AE |
2559 | } |
2560 | ||
59c2be1e YS |
2561 | static ssize_t rbd_add(struct bus_type *bus, |
2562 | const char *buf, | |
2563 | size_t count) | |
602adf40 | 2564 | { |
cb8627c7 AE |
2565 | char *options; |
2566 | struct rbd_device *rbd_dev = NULL; | |
7ef3214a AE |
2567 | const char *mon_addrs = NULL; |
2568 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2569 | struct ceph_osd_client *osdc; |
2570 | int rc = -ENOMEM; | |
602adf40 YS |
2571 | |
2572 | if (!try_module_get(THIS_MODULE)) | |
2573 | return -ENODEV; | |
2574 | ||
60571c7d | 2575 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2576 | if (!options) |
27cc2594 | 2577 | goto err_nomem; |
cb8627c7 AE |
2578 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2579 | if (!rbd_dev) | |
2580 | goto err_nomem; | |
602adf40 YS |
2581 | |
2582 | /* static rbd_device initialization */ | |
2583 | spin_lock_init(&rbd_dev->lock); | |
2584 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2585 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2586 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2587 | |
d184f6bf | 2588 | /* generate unique id: find highest unique id, add one */ |
e2839308 | 2589 | rbd_dev_id_get(rbd_dev); |
602adf40 | 2590 | |
a725f65e | 2591 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2592 | BUILD_BUG_ON(DEV_NAME_LEN |
2593 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
de71a297 | 2594 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
a725f65e | 2595 | |
602adf40 | 2596 | /* parse add command */ |
7ef3214a | 2597 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2598 | options, count); |
a725f65e | 2599 | if (rc) |
f0f8cef5 | 2600 | goto err_put_id; |
e124a82f | 2601 | |
f8c38929 AE |
2602 | rc = rbd_get_client(rbd_dev, mon_addrs, mon_addrs_size - 1, options); |
2603 | if (rc < 0) | |
f0f8cef5 | 2604 | goto err_put_id; |
602adf40 | 2605 | |
602adf40 | 2606 | /* pick the pool */ |
1dbb4399 | 2607 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2608 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2609 | if (rc < 0) | |
2610 | goto err_out_client; | |
9bb2f334 | 2611 | rbd_dev->pool_id = rc; |
602adf40 YS |
2612 | |
2613 | /* register our block device */ | |
27cc2594 AE |
2614 | rc = register_blkdev(0, rbd_dev->name); |
2615 | if (rc < 0) | |
602adf40 | 2616 | goto err_out_client; |
27cc2594 | 2617 | rbd_dev->major = rc; |
602adf40 | 2618 | |
dfc5606d YS |
2619 | rc = rbd_bus_add_dev(rbd_dev); |
2620 | if (rc) | |
766fc439 YS |
2621 | goto err_out_blkdev; |
2622 | ||
32eec68d AE |
2623 | /* |
2624 | * At this point cleanup in the event of an error is the job | |
2625 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2626 | * | |
2627 | * Set up and announce blkdev mapping. | |
2628 | */ | |
602adf40 YS |
2629 | rc = rbd_init_disk(rbd_dev); |
2630 | if (rc) | |
766fc439 | 2631 | goto err_out_bus; |
602adf40 | 2632 | |
59c2be1e YS |
2633 | rc = rbd_init_watch_dev(rbd_dev); |
2634 | if (rc) | |
2635 | goto err_out_bus; | |
2636 | ||
602adf40 YS |
2637 | return count; |
2638 | ||
766fc439 | 2639 | err_out_bus: |
766fc439 YS |
2640 | /* this will also clean up rest of rbd_dev stuff */ |
2641 | ||
2642 | rbd_bus_del_dev(rbd_dev); | |
2643 | kfree(options); | |
766fc439 YS |
2644 | return rc; |
2645 | ||
602adf40 YS |
2646 | err_out_blkdev: |
2647 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2648 | err_out_client: | |
2649 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2650 | err_put_id: |
cb8627c7 | 2651 | if (rbd_dev->pool_name) { |
f84344f3 | 2652 | kfree(rbd_dev->mapping.snap_name); |
0bed54dc AE |
2653 | kfree(rbd_dev->header_name); |
2654 | kfree(rbd_dev->image_name); | |
cb8627c7 AE |
2655 | kfree(rbd_dev->pool_name); |
2656 | } | |
e2839308 | 2657 | rbd_dev_id_put(rbd_dev); |
27cc2594 | 2658 | err_nomem: |
27cc2594 | 2659 | kfree(rbd_dev); |
cb8627c7 | 2660 | kfree(options); |
27cc2594 | 2661 | |
602adf40 YS |
2662 | dout("Error adding device %s\n", buf); |
2663 | module_put(THIS_MODULE); | |
27cc2594 AE |
2664 | |
2665 | return (ssize_t) rc; | |
602adf40 YS |
2666 | } |
2667 | ||
de71a297 | 2668 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
2669 | { |
2670 | struct list_head *tmp; | |
2671 | struct rbd_device *rbd_dev; | |
2672 | ||
e124a82f | 2673 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2674 | list_for_each(tmp, &rbd_dev_list) { |
2675 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 2676 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 2677 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 2678 | return rbd_dev; |
e124a82f | 2679 | } |
602adf40 | 2680 | } |
e124a82f | 2681 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2682 | return NULL; |
2683 | } | |
2684 | ||
dfc5606d | 2685 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2686 | { |
593a9e7b | 2687 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2688 | |
1dbb4399 AE |
2689 | if (rbd_dev->watch_request) { |
2690 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2691 | ||
2692 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2693 | rbd_dev->watch_request); |
1dbb4399 | 2694 | } |
59c2be1e | 2695 | if (rbd_dev->watch_event) |
070c633f | 2696 | rbd_req_sync_unwatch(rbd_dev); |
59c2be1e | 2697 | |
602adf40 YS |
2698 | rbd_put_client(rbd_dev); |
2699 | ||
2700 | /* clean up and free blkdev */ | |
2701 | rbd_free_disk(rbd_dev); | |
2702 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2703 | |
2704 | /* done with the id, and with the rbd_dev */ | |
f84344f3 | 2705 | kfree(rbd_dev->mapping.snap_name); |
0bed54dc | 2706 | kfree(rbd_dev->header_name); |
d22f76e7 | 2707 | kfree(rbd_dev->pool_name); |
0bed54dc | 2708 | kfree(rbd_dev->image_name); |
e2839308 | 2709 | rbd_dev_id_put(rbd_dev); |
602adf40 YS |
2710 | kfree(rbd_dev); |
2711 | ||
2712 | /* release module ref */ | |
2713 | module_put(THIS_MODULE); | |
602adf40 YS |
2714 | } |
2715 | ||
dfc5606d YS |
2716 | static ssize_t rbd_remove(struct bus_type *bus, |
2717 | const char *buf, | |
2718 | size_t count) | |
602adf40 YS |
2719 | { |
2720 | struct rbd_device *rbd_dev = NULL; | |
2721 | int target_id, rc; | |
2722 | unsigned long ul; | |
2723 | int ret = count; | |
2724 | ||
2725 | rc = strict_strtoul(buf, 10, &ul); | |
2726 | if (rc) | |
2727 | return rc; | |
2728 | ||
2729 | /* convert to int; abort if we lost anything in the conversion */ | |
2730 | target_id = (int) ul; | |
2731 | if (target_id != ul) | |
2732 | return -EINVAL; | |
2733 | ||
2734 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2735 | ||
2736 | rbd_dev = __rbd_get_dev(target_id); | |
2737 | if (!rbd_dev) { | |
2738 | ret = -ENOENT; | |
2739 | goto done; | |
2740 | } | |
2741 | ||
dfc5606d YS |
2742 | __rbd_remove_all_snaps(rbd_dev); |
2743 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2744 | |
2745 | done: | |
2746 | mutex_unlock(&ctl_mutex); | |
aafb230e | 2747 | |
602adf40 YS |
2748 | return ret; |
2749 | } | |
2750 | ||
dfc5606d YS |
2751 | static ssize_t rbd_snap_add(struct device *dev, |
2752 | struct device_attribute *attr, | |
2753 | const char *buf, | |
2754 | size_t count) | |
602adf40 | 2755 | { |
593a9e7b | 2756 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2757 | int ret; |
2758 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2759 | if (!name) |
2760 | return -ENOMEM; | |
2761 | ||
dfc5606d | 2762 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2763 | |
2764 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2765 | ||
602adf40 YS |
2766 | ret = rbd_header_add_snap(rbd_dev, |
2767 | name, GFP_KERNEL); | |
2768 | if (ret < 0) | |
59c2be1e | 2769 | goto err_unlock; |
602adf40 | 2770 | |
b813623a | 2771 | ret = __rbd_refresh_header(rbd_dev, NULL); |
602adf40 | 2772 | if (ret < 0) |
59c2be1e YS |
2773 | goto err_unlock; |
2774 | ||
2775 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2776 | trigger a watch callback that would need to get that mutex */ | |
2777 | mutex_unlock(&ctl_mutex); | |
2778 | ||
2779 | /* make a best effort, don't error if failed */ | |
4cb16250 | 2780 | rbd_req_sync_notify(rbd_dev); |
602adf40 YS |
2781 | |
2782 | ret = count; | |
59c2be1e YS |
2783 | kfree(name); |
2784 | return ret; | |
2785 | ||
2786 | err_unlock: | |
602adf40 | 2787 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2788 | kfree(name); |
2789 | return ret; | |
2790 | } | |
2791 | ||
602adf40 YS |
2792 | /* |
2793 | * create control files in sysfs | |
dfc5606d | 2794 | * /sys/bus/rbd/... |
602adf40 YS |
2795 | */ |
2796 | static int rbd_sysfs_init(void) | |
2797 | { | |
dfc5606d | 2798 | int ret; |
602adf40 | 2799 | |
fed4c143 | 2800 | ret = device_register(&rbd_root_dev); |
21079786 | 2801 | if (ret < 0) |
dfc5606d | 2802 | return ret; |
602adf40 | 2803 | |
fed4c143 AE |
2804 | ret = bus_register(&rbd_bus_type); |
2805 | if (ret < 0) | |
2806 | device_unregister(&rbd_root_dev); | |
602adf40 | 2807 | |
602adf40 YS |
2808 | return ret; |
2809 | } | |
2810 | ||
2811 | static void rbd_sysfs_cleanup(void) | |
2812 | { | |
dfc5606d | 2813 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2814 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2815 | } |
2816 | ||
2817 | int __init rbd_init(void) | |
2818 | { | |
2819 | int rc; | |
2820 | ||
2821 | rc = rbd_sysfs_init(); | |
2822 | if (rc) | |
2823 | return rc; | |
f0f8cef5 | 2824 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2825 | return 0; |
2826 | } | |
2827 | ||
2828 | void __exit rbd_exit(void) | |
2829 | { | |
2830 | rbd_sysfs_cleanup(); | |
2831 | } | |
2832 | ||
2833 | module_init(rbd_init); | |
2834 | module_exit(rbd_exit); | |
2835 | ||
2836 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2837 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2838 | MODULE_DESCRIPTION("rados block device"); | |
2839 | ||
2840 | /* following authorship retained from original osdblk.c */ | |
2841 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2842 | ||
2843 | MODULE_LICENSE("GPL"); |