Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
593a9e7b AE |
44 | /* |
45 | * The basic unit of block I/O is a sector. It is interpreted in a | |
46 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
47 | * universally 512 bytes. These symbols are just slightly more | |
48 | * meaningful than the bare numbers they represent. | |
49 | */ | |
50 | #define SECTOR_SHIFT 9 | |
51 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
52 | ||
f0f8cef5 AE |
53 | #define RBD_DRV_NAME "rbd" |
54 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
55 | |
56 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
57 | ||
21079786 | 58 | #define RBD_MAX_MD_NAME_LEN (RBD_MAX_OBJ_NAME_LEN + sizeof(RBD_SUFFIX)) |
602adf40 YS |
59 | #define RBD_MAX_SNAP_NAME_LEN 32 |
60 | #define RBD_MAX_OPT_LEN 1024 | |
61 | ||
62 | #define RBD_SNAP_HEAD_NAME "-" | |
63 | ||
81a89793 AE |
64 | /* |
65 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
66 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
67 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
68 | * enough to hold all possible device names. | |
69 | */ | |
602adf40 | 70 | #define DEV_NAME_LEN 32 |
81a89793 | 71 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 | 72 | |
59c2be1e YS |
73 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
74 | ||
602adf40 YS |
75 | /* |
76 | * block device image metadata (in-memory version) | |
77 | */ | |
78 | struct rbd_image_header { | |
79 | u64 image_size; | |
ca1e49a6 | 80 | char object_prefix[32]; |
602adf40 YS |
81 | __u8 obj_order; |
82 | __u8 crypt_type; | |
83 | __u8 comp_type; | |
602adf40 YS |
84 | struct ceph_snap_context *snapc; |
85 | size_t snap_names_len; | |
86 | u64 snap_seq; | |
87 | u32 total_snaps; | |
88 | ||
89 | char *snap_names; | |
90 | u64 *snap_sizes; | |
59c2be1e YS |
91 | |
92 | u64 obj_version; | |
93 | }; | |
94 | ||
95 | struct rbd_options { | |
96 | int notify_timeout; | |
602adf40 YS |
97 | }; |
98 | ||
99 | /* | |
f0f8cef5 | 100 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
101 | */ |
102 | struct rbd_client { | |
103 | struct ceph_client *client; | |
59c2be1e | 104 | struct rbd_options *rbd_opts; |
602adf40 YS |
105 | struct kref kref; |
106 | struct list_head node; | |
107 | }; | |
108 | ||
109 | /* | |
f0f8cef5 | 110 | * a request completion status |
602adf40 | 111 | */ |
1fec7093 YS |
112 | struct rbd_req_status { |
113 | int done; | |
114 | int rc; | |
115 | u64 bytes; | |
116 | }; | |
117 | ||
118 | /* | |
119 | * a collection of requests | |
120 | */ | |
121 | struct rbd_req_coll { | |
122 | int total; | |
123 | int num_done; | |
124 | struct kref kref; | |
125 | struct rbd_req_status status[0]; | |
602adf40 YS |
126 | }; |
127 | ||
f0f8cef5 AE |
128 | /* |
129 | * a single io request | |
130 | */ | |
131 | struct rbd_request { | |
132 | struct request *rq; /* blk layer request */ | |
133 | struct bio *bio; /* cloned bio */ | |
134 | struct page **pages; /* list of used pages */ | |
135 | u64 len; | |
136 | int coll_index; | |
137 | struct rbd_req_coll *coll; | |
138 | }; | |
139 | ||
dfc5606d YS |
140 | struct rbd_snap { |
141 | struct device dev; | |
142 | const char *name; | |
3591538f | 143 | u64 size; |
dfc5606d YS |
144 | struct list_head node; |
145 | u64 id; | |
146 | }; | |
147 | ||
602adf40 YS |
148 | /* |
149 | * a single device | |
150 | */ | |
151 | struct rbd_device { | |
152 | int id; /* blkdev unique id */ | |
153 | ||
154 | int major; /* blkdev assigned major */ | |
155 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
156 | struct request_queue *q; | |
157 | ||
602adf40 YS |
158 | struct rbd_client *rbd_client; |
159 | ||
160 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
161 | ||
162 | spinlock_t lock; /* queue lock */ | |
163 | ||
164 | struct rbd_image_header header; | |
165 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ | |
166 | int obj_len; | |
167 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ | |
d22f76e7 | 168 | char *pool_name; |
9bb2f334 | 169 | int pool_id; |
602adf40 | 170 | |
59c2be1e YS |
171 | struct ceph_osd_event *watch_event; |
172 | struct ceph_osd_request *watch_request; | |
173 | ||
c666601a JD |
174 | /* protects updating the header */ |
175 | struct rw_semaphore header_rwsem; | |
602adf40 | 176 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; |
77dfe99f | 177 | u64 snap_id; /* current snapshot id */ |
602adf40 YS |
178 | int read_only; |
179 | ||
180 | struct list_head node; | |
dfc5606d YS |
181 | |
182 | /* list of snapshots */ | |
183 | struct list_head snaps; | |
184 | ||
185 | /* sysfs related */ | |
186 | struct device dev; | |
187 | }; | |
188 | ||
602adf40 | 189 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 190 | |
602adf40 | 191 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
192 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
193 | ||
432b8587 AE |
194 | static LIST_HEAD(rbd_client_list); /* clients */ |
195 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 196 | |
dfc5606d YS |
197 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
198 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
199 | static ssize_t rbd_snap_add(struct device *dev, |
200 | struct device_attribute *attr, | |
201 | const char *buf, | |
202 | size_t count); | |
203 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
69932487 | 204 | struct rbd_snap *snap); |
dfc5606d | 205 | |
f0f8cef5 AE |
206 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
207 | size_t count); | |
208 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
209 | size_t count); | |
210 | ||
211 | static struct bus_attribute rbd_bus_attrs[] = { | |
212 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
213 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
214 | __ATTR_NULL | |
215 | }; | |
216 | ||
217 | static struct bus_type rbd_bus_type = { | |
218 | .name = "rbd", | |
219 | .bus_attrs = rbd_bus_attrs, | |
220 | }; | |
221 | ||
222 | static void rbd_root_dev_release(struct device *dev) | |
223 | { | |
224 | } | |
225 | ||
226 | static struct device rbd_root_dev = { | |
227 | .init_name = "rbd", | |
228 | .release = rbd_root_dev_release, | |
229 | }; | |
230 | ||
dfc5606d | 231 | |
dfc5606d YS |
232 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) |
233 | { | |
234 | return get_device(&rbd_dev->dev); | |
235 | } | |
236 | ||
237 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
238 | { | |
239 | put_device(&rbd_dev->dev); | |
240 | } | |
602adf40 | 241 | |
263c6ca0 | 242 | static int __rbd_refresh_header(struct rbd_device *rbd_dev); |
59c2be1e | 243 | |
602adf40 YS |
244 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
245 | { | |
f0f8cef5 | 246 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
602adf40 | 247 | |
dfc5606d YS |
248 | rbd_get_dev(rbd_dev); |
249 | ||
602adf40 YS |
250 | set_device_ro(bdev, rbd_dev->read_only); |
251 | ||
252 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
253 | return -EROFS; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
dfc5606d YS |
258 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
259 | { | |
260 | struct rbd_device *rbd_dev = disk->private_data; | |
261 | ||
262 | rbd_put_dev(rbd_dev); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
602adf40 YS |
267 | static const struct block_device_operations rbd_bd_ops = { |
268 | .owner = THIS_MODULE, | |
269 | .open = rbd_open, | |
dfc5606d | 270 | .release = rbd_release, |
602adf40 YS |
271 | }; |
272 | ||
273 | /* | |
274 | * Initialize an rbd client instance. | |
275 | * We own *opt. | |
276 | */ | |
59c2be1e YS |
277 | static struct rbd_client *rbd_client_create(struct ceph_options *opt, |
278 | struct rbd_options *rbd_opts) | |
602adf40 YS |
279 | { |
280 | struct rbd_client *rbdc; | |
281 | int ret = -ENOMEM; | |
282 | ||
283 | dout("rbd_client_create\n"); | |
284 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
285 | if (!rbdc) | |
286 | goto out_opt; | |
287 | ||
288 | kref_init(&rbdc->kref); | |
289 | INIT_LIST_HEAD(&rbdc->node); | |
290 | ||
bc534d86 AE |
291 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
292 | ||
6ab00d46 | 293 | rbdc->client = ceph_create_client(opt, rbdc, 0, 0); |
602adf40 | 294 | if (IS_ERR(rbdc->client)) |
bc534d86 | 295 | goto out_mutex; |
28f259b7 | 296 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
602adf40 YS |
297 | |
298 | ret = ceph_open_session(rbdc->client); | |
299 | if (ret < 0) | |
300 | goto out_err; | |
301 | ||
59c2be1e YS |
302 | rbdc->rbd_opts = rbd_opts; |
303 | ||
432b8587 | 304 | spin_lock(&rbd_client_list_lock); |
602adf40 | 305 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 306 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 307 | |
bc534d86 AE |
308 | mutex_unlock(&ctl_mutex); |
309 | ||
602adf40 YS |
310 | dout("rbd_client_create created %p\n", rbdc); |
311 | return rbdc; | |
312 | ||
313 | out_err: | |
314 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
315 | out_mutex: |
316 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
317 | kfree(rbdc); |
318 | out_opt: | |
28f259b7 VK |
319 | if (opt) |
320 | ceph_destroy_options(opt); | |
321 | return ERR_PTR(ret); | |
602adf40 YS |
322 | } |
323 | ||
324 | /* | |
325 | * Find a ceph client with specific addr and configuration. | |
326 | */ | |
327 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) | |
328 | { | |
329 | struct rbd_client *client_node; | |
330 | ||
331 | if (opt->flags & CEPH_OPT_NOSHARE) | |
332 | return NULL; | |
333 | ||
334 | list_for_each_entry(client_node, &rbd_client_list, node) | |
335 | if (ceph_compare_options(opt, client_node->client) == 0) | |
336 | return client_node; | |
337 | return NULL; | |
338 | } | |
339 | ||
59c2be1e YS |
340 | /* |
341 | * mount options | |
342 | */ | |
343 | enum { | |
344 | Opt_notify_timeout, | |
345 | Opt_last_int, | |
346 | /* int args above */ | |
347 | Opt_last_string, | |
348 | /* string args above */ | |
349 | }; | |
350 | ||
351 | static match_table_t rbdopt_tokens = { | |
352 | {Opt_notify_timeout, "notify_timeout=%d"}, | |
353 | /* int args above */ | |
354 | /* string args above */ | |
355 | {-1, NULL} | |
356 | }; | |
357 | ||
358 | static int parse_rbd_opts_token(char *c, void *private) | |
359 | { | |
360 | struct rbd_options *rbdopt = private; | |
361 | substring_t argstr[MAX_OPT_ARGS]; | |
362 | int token, intval, ret; | |
363 | ||
21079786 | 364 | token = match_token(c, rbdopt_tokens, argstr); |
59c2be1e YS |
365 | if (token < 0) |
366 | return -EINVAL; | |
367 | ||
368 | if (token < Opt_last_int) { | |
369 | ret = match_int(&argstr[0], &intval); | |
370 | if (ret < 0) { | |
371 | pr_err("bad mount option arg (not int) " | |
372 | "at '%s'\n", c); | |
373 | return ret; | |
374 | } | |
375 | dout("got int token %d val %d\n", token, intval); | |
376 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
377 | dout("got string token %d val %s\n", token, | |
378 | argstr[0].from); | |
379 | } else { | |
380 | dout("got token %d\n", token); | |
381 | } | |
382 | ||
383 | switch (token) { | |
384 | case Opt_notify_timeout: | |
385 | rbdopt->notify_timeout = intval; | |
386 | break; | |
387 | default: | |
388 | BUG_ON(token); | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
602adf40 YS |
393 | /* |
394 | * Get a ceph client with specific addr and configuration, if one does | |
395 | * not exist create it. | |
396 | */ | |
5214ecc4 AE |
397 | static struct rbd_client *rbd_get_client(const char *mon_addr, |
398 | size_t mon_addr_len, | |
399 | char *options) | |
602adf40 YS |
400 | { |
401 | struct rbd_client *rbdc; | |
402 | struct ceph_options *opt; | |
59c2be1e YS |
403 | struct rbd_options *rbd_opts; |
404 | ||
405 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
406 | if (!rbd_opts) | |
d720bcb0 | 407 | return ERR_PTR(-ENOMEM); |
59c2be1e YS |
408 | |
409 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 | 410 | |
ee57741c | 411 | opt = ceph_parse_options(options, mon_addr, |
5214ecc4 | 412 | mon_addr + mon_addr_len, |
21079786 | 413 | parse_rbd_opts_token, rbd_opts); |
ee57741c | 414 | if (IS_ERR(opt)) { |
d720bcb0 AE |
415 | kfree(rbd_opts); |
416 | return ERR_CAST(opt); | |
ee57741c | 417 | } |
602adf40 | 418 | |
432b8587 | 419 | spin_lock(&rbd_client_list_lock); |
602adf40 YS |
420 | rbdc = __rbd_client_find(opt); |
421 | if (rbdc) { | |
602adf40 YS |
422 | /* using an existing client */ |
423 | kref_get(&rbdc->kref); | |
432b8587 | 424 | spin_unlock(&rbd_client_list_lock); |
e6994d3d | 425 | |
e6994d3d AE |
426 | ceph_destroy_options(opt); |
427 | kfree(rbd_opts); | |
428 | ||
d720bcb0 | 429 | return rbdc; |
602adf40 | 430 | } |
432b8587 | 431 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 432 | |
59c2be1e | 433 | rbdc = rbd_client_create(opt, rbd_opts); |
d97081b0 | 434 | |
d720bcb0 AE |
435 | if (IS_ERR(rbdc)) |
436 | kfree(rbd_opts); | |
602adf40 | 437 | |
d720bcb0 | 438 | return rbdc; |
602adf40 YS |
439 | } |
440 | ||
441 | /* | |
442 | * Destroy ceph client | |
d23a4b3f | 443 | * |
432b8587 | 444 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
445 | */ |
446 | static void rbd_client_release(struct kref *kref) | |
447 | { | |
448 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
449 | ||
450 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 451 | spin_lock(&rbd_client_list_lock); |
602adf40 | 452 | list_del(&rbdc->node); |
cd9d9f5d | 453 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
454 | |
455 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 456 | kfree(rbdc->rbd_opts); |
602adf40 YS |
457 | kfree(rbdc); |
458 | } | |
459 | ||
460 | /* | |
461 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
462 | * it. | |
463 | */ | |
464 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
465 | { | |
466 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); | |
467 | rbd_dev->rbd_client = NULL; | |
602adf40 YS |
468 | } |
469 | ||
1fec7093 YS |
470 | /* |
471 | * Destroy requests collection | |
472 | */ | |
473 | static void rbd_coll_release(struct kref *kref) | |
474 | { | |
475 | struct rbd_req_coll *coll = | |
476 | container_of(kref, struct rbd_req_coll, kref); | |
477 | ||
478 | dout("rbd_coll_release %p\n", coll); | |
479 | kfree(coll); | |
480 | } | |
602adf40 YS |
481 | |
482 | /* | |
483 | * Create a new header structure, translate header format from the on-disk | |
484 | * header. | |
485 | */ | |
486 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
487 | struct rbd_image_header_ondisk *ondisk, | |
50f7c4c9 | 488 | u32 allocated_snaps, |
602adf40 YS |
489 | gfp_t gfp_flags) |
490 | { | |
50f7c4c9 | 491 | u32 i, snap_count; |
602adf40 | 492 | |
21079786 | 493 | if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) |
81e759fb | 494 | return -ENXIO; |
81e759fb | 495 | |
00f1f36f | 496 | snap_count = le32_to_cpu(ondisk->snap_count); |
50f7c4c9 XW |
497 | if (snap_count > (UINT_MAX - sizeof(struct ceph_snap_context)) |
498 | / sizeof (*ondisk)) | |
499 | return -EINVAL; | |
602adf40 | 500 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + |
f9f9a190 | 501 | snap_count * sizeof(u64), |
602adf40 YS |
502 | gfp_flags); |
503 | if (!header->snapc) | |
504 | return -ENOMEM; | |
00f1f36f | 505 | |
00f1f36f | 506 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
602adf40 YS |
507 | if (snap_count) { |
508 | header->snap_names = kmalloc(header->snap_names_len, | |
f8ad495a | 509 | gfp_flags); |
602adf40 YS |
510 | if (!header->snap_names) |
511 | goto err_snapc; | |
512 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
f8ad495a | 513 | gfp_flags); |
602adf40 YS |
514 | if (!header->snap_sizes) |
515 | goto err_names; | |
516 | } else { | |
517 | header->snap_names = NULL; | |
518 | header->snap_sizes = NULL; | |
519 | } | |
ca1e49a6 | 520 | memcpy(header->object_prefix, ondisk->block_name, |
602adf40 YS |
521 | sizeof(ondisk->block_name)); |
522 | ||
523 | header->image_size = le64_to_cpu(ondisk->image_size); | |
524 | header->obj_order = ondisk->options.order; | |
525 | header->crypt_type = ondisk->options.crypt_type; | |
526 | header->comp_type = ondisk->options.comp_type; | |
527 | ||
528 | atomic_set(&header->snapc->nref, 1); | |
529 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
530 | header->snapc->num_snaps = snap_count; | |
531 | header->total_snaps = snap_count; | |
532 | ||
21079786 | 533 | if (snap_count && allocated_snaps == snap_count) { |
602adf40 YS |
534 | for (i = 0; i < snap_count; i++) { |
535 | header->snapc->snaps[i] = | |
536 | le64_to_cpu(ondisk->snaps[i].id); | |
537 | header->snap_sizes[i] = | |
538 | le64_to_cpu(ondisk->snaps[i].image_size); | |
539 | } | |
540 | ||
541 | /* copy snapshot names */ | |
542 | memcpy(header->snap_names, &ondisk->snaps[i], | |
543 | header->snap_names_len); | |
544 | } | |
545 | ||
546 | return 0; | |
547 | ||
548 | err_names: | |
549 | kfree(header->snap_names); | |
550 | err_snapc: | |
551 | kfree(header->snapc); | |
00f1f36f | 552 | return -ENOMEM; |
602adf40 YS |
553 | } |
554 | ||
602adf40 YS |
555 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, |
556 | u64 *seq, u64 *size) | |
557 | { | |
558 | int i; | |
559 | char *p = header->snap_names; | |
560 | ||
00f1f36f AE |
561 | for (i = 0; i < header->total_snaps; i++) { |
562 | if (!strcmp(snap_name, p)) { | |
602adf40 | 563 | |
00f1f36f | 564 | /* Found it. Pass back its id and/or size */ |
602adf40 | 565 | |
00f1f36f AE |
566 | if (seq) |
567 | *seq = header->snapc->snaps[i]; | |
568 | if (size) | |
569 | *size = header->snap_sizes[i]; | |
570 | return i; | |
571 | } | |
572 | p += strlen(p) + 1; /* Skip ahead to the next name */ | |
573 | } | |
574 | return -ENOENT; | |
602adf40 YS |
575 | } |
576 | ||
cc9d734c | 577 | static int rbd_header_set_snap(struct rbd_device *dev, u64 *size) |
602adf40 YS |
578 | { |
579 | struct rbd_image_header *header = &dev->header; | |
580 | struct ceph_snap_context *snapc = header->snapc; | |
581 | int ret = -ENOENT; | |
582 | ||
cc9d734c JD |
583 | BUILD_BUG_ON(sizeof (dev->snap_name) < sizeof (RBD_SNAP_HEAD_NAME)); |
584 | ||
c666601a | 585 | down_write(&dev->header_rwsem); |
602adf40 | 586 | |
cc9d734c JD |
587 | if (!memcmp(dev->snap_name, RBD_SNAP_HEAD_NAME, |
588 | sizeof (RBD_SNAP_HEAD_NAME))) { | |
602adf40 YS |
589 | if (header->total_snaps) |
590 | snapc->seq = header->snap_seq; | |
591 | else | |
592 | snapc->seq = 0; | |
77dfe99f | 593 | dev->snap_id = CEPH_NOSNAP; |
602adf40 YS |
594 | dev->read_only = 0; |
595 | if (size) | |
596 | *size = header->image_size; | |
597 | } else { | |
cc9d734c | 598 | ret = snap_by_name(header, dev->snap_name, &snapc->seq, size); |
602adf40 YS |
599 | if (ret < 0) |
600 | goto done; | |
77dfe99f | 601 | dev->snap_id = snapc->seq; |
602adf40 YS |
602 | dev->read_only = 1; |
603 | } | |
604 | ||
605 | ret = 0; | |
606 | done: | |
c666601a | 607 | up_write(&dev->header_rwsem); |
602adf40 YS |
608 | return ret; |
609 | } | |
610 | ||
611 | static void rbd_header_free(struct rbd_image_header *header) | |
612 | { | |
613 | kfree(header->snapc); | |
614 | kfree(header->snap_names); | |
615 | kfree(header->snap_sizes); | |
616 | } | |
617 | ||
618 | /* | |
619 | * get the actual striped segment name, offset and length | |
620 | */ | |
621 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
ca1e49a6 | 622 | const char *object_prefix, |
602adf40 YS |
623 | u64 ofs, u64 len, |
624 | char *seg_name, u64 *segofs) | |
625 | { | |
626 | u64 seg = ofs >> header->obj_order; | |
627 | ||
628 | if (seg_name) | |
629 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
ca1e49a6 | 630 | "%s.%012llx", object_prefix, seg); |
602adf40 YS |
631 | |
632 | ofs = ofs & ((1 << header->obj_order) - 1); | |
633 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
634 | ||
635 | if (segofs) | |
636 | *segofs = ofs; | |
637 | ||
638 | return len; | |
639 | } | |
640 | ||
1fec7093 YS |
641 | static int rbd_get_num_segments(struct rbd_image_header *header, |
642 | u64 ofs, u64 len) | |
643 | { | |
644 | u64 start_seg = ofs >> header->obj_order; | |
645 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
646 | return end_seg - start_seg + 1; | |
647 | } | |
648 | ||
029bcbd8 JD |
649 | /* |
650 | * returns the size of an object in the image | |
651 | */ | |
652 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
653 | { | |
654 | return 1 << header->obj_order; | |
655 | } | |
656 | ||
602adf40 YS |
657 | /* |
658 | * bio helpers | |
659 | */ | |
660 | ||
661 | static void bio_chain_put(struct bio *chain) | |
662 | { | |
663 | struct bio *tmp; | |
664 | ||
665 | while (chain) { | |
666 | tmp = chain; | |
667 | chain = chain->bi_next; | |
668 | bio_put(tmp); | |
669 | } | |
670 | } | |
671 | ||
672 | /* | |
673 | * zeros a bio chain, starting at specific offset | |
674 | */ | |
675 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
676 | { | |
677 | struct bio_vec *bv; | |
678 | unsigned long flags; | |
679 | void *buf; | |
680 | int i; | |
681 | int pos = 0; | |
682 | ||
683 | while (chain) { | |
684 | bio_for_each_segment(bv, chain, i) { | |
685 | if (pos + bv->bv_len > start_ofs) { | |
686 | int remainder = max(start_ofs - pos, 0); | |
687 | buf = bvec_kmap_irq(bv, &flags); | |
688 | memset(buf + remainder, 0, | |
689 | bv->bv_len - remainder); | |
85b5aaa6 | 690 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
691 | } |
692 | pos += bv->bv_len; | |
693 | } | |
694 | ||
695 | chain = chain->bi_next; | |
696 | } | |
697 | } | |
698 | ||
699 | /* | |
700 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
701 | * might return a bio_pair that will need to be released. | |
702 | */ | |
703 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
704 | struct bio_pair **bp, | |
705 | int len, gfp_t gfpmask) | |
706 | { | |
707 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
708 | int total = 0; | |
709 | ||
710 | if (*bp) { | |
711 | bio_pair_release(*bp); | |
712 | *bp = NULL; | |
713 | } | |
714 | ||
715 | while (old_chain && (total < len)) { | |
716 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
717 | if (!tmp) | |
718 | goto err_out; | |
719 | ||
720 | if (total + old_chain->bi_size > len) { | |
721 | struct bio_pair *bp; | |
722 | ||
723 | /* | |
724 | * this split can only happen with a single paged bio, | |
725 | * split_bio will BUG_ON if this is not the case | |
726 | */ | |
727 | dout("bio_chain_clone split! total=%d remaining=%d" | |
728 | "bi_size=%d\n", | |
729 | (int)total, (int)len-total, | |
730 | (int)old_chain->bi_size); | |
731 | ||
732 | /* split the bio. We'll release it either in the next | |
733 | call, or it will have to be released outside */ | |
593a9e7b | 734 | bp = bio_split(old_chain, (len - total) / SECTOR_SIZE); |
602adf40 YS |
735 | if (!bp) |
736 | goto err_out; | |
737 | ||
738 | __bio_clone(tmp, &bp->bio1); | |
739 | ||
740 | *next = &bp->bio2; | |
741 | } else { | |
742 | __bio_clone(tmp, old_chain); | |
743 | *next = old_chain->bi_next; | |
744 | } | |
745 | ||
746 | tmp->bi_bdev = NULL; | |
747 | gfpmask &= ~__GFP_WAIT; | |
748 | tmp->bi_next = NULL; | |
749 | ||
750 | if (!new_chain) { | |
751 | new_chain = tail = tmp; | |
752 | } else { | |
753 | tail->bi_next = tmp; | |
754 | tail = tmp; | |
755 | } | |
756 | old_chain = old_chain->bi_next; | |
757 | ||
758 | total += tmp->bi_size; | |
759 | } | |
760 | ||
761 | BUG_ON(total < len); | |
762 | ||
763 | if (tail) | |
764 | tail->bi_next = NULL; | |
765 | ||
766 | *old = old_chain; | |
767 | ||
768 | return new_chain; | |
769 | ||
770 | err_out: | |
771 | dout("bio_chain_clone with err\n"); | |
772 | bio_chain_put(new_chain); | |
773 | return NULL; | |
774 | } | |
775 | ||
776 | /* | |
777 | * helpers for osd request op vectors. | |
778 | */ | |
779 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
780 | int num_ops, | |
781 | int opcode, | |
782 | u32 payload_len) | |
783 | { | |
784 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
785 | GFP_NOIO); | |
786 | if (!*ops) | |
787 | return -ENOMEM; | |
788 | (*ops)[0].op = opcode; | |
789 | /* | |
790 | * op extent offset and length will be set later on | |
791 | * in calc_raw_layout() | |
792 | */ | |
793 | (*ops)[0].payload_len = payload_len; | |
794 | return 0; | |
795 | } | |
796 | ||
797 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
798 | { | |
799 | kfree(ops); | |
800 | } | |
801 | ||
1fec7093 YS |
802 | static void rbd_coll_end_req_index(struct request *rq, |
803 | struct rbd_req_coll *coll, | |
804 | int index, | |
805 | int ret, u64 len) | |
806 | { | |
807 | struct request_queue *q; | |
808 | int min, max, i; | |
809 | ||
810 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", | |
811 | coll, index, ret, len); | |
812 | ||
813 | if (!rq) | |
814 | return; | |
815 | ||
816 | if (!coll) { | |
817 | blk_end_request(rq, ret, len); | |
818 | return; | |
819 | } | |
820 | ||
821 | q = rq->q; | |
822 | ||
823 | spin_lock_irq(q->queue_lock); | |
824 | coll->status[index].done = 1; | |
825 | coll->status[index].rc = ret; | |
826 | coll->status[index].bytes = len; | |
827 | max = min = coll->num_done; | |
828 | while (max < coll->total && coll->status[max].done) | |
829 | max++; | |
830 | ||
831 | for (i = min; i<max; i++) { | |
832 | __blk_end_request(rq, coll->status[i].rc, | |
833 | coll->status[i].bytes); | |
834 | coll->num_done++; | |
835 | kref_put(&coll->kref, rbd_coll_release); | |
836 | } | |
837 | spin_unlock_irq(q->queue_lock); | |
838 | } | |
839 | ||
840 | static void rbd_coll_end_req(struct rbd_request *req, | |
841 | int ret, u64 len) | |
842 | { | |
843 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
844 | } | |
845 | ||
602adf40 YS |
846 | /* |
847 | * Send ceph osd request | |
848 | */ | |
849 | static int rbd_do_request(struct request *rq, | |
850 | struct rbd_device *dev, | |
851 | struct ceph_snap_context *snapc, | |
852 | u64 snapid, | |
853 | const char *obj, u64 ofs, u64 len, | |
854 | struct bio *bio, | |
855 | struct page **pages, | |
856 | int num_pages, | |
857 | int flags, | |
858 | struct ceph_osd_req_op *ops, | |
859 | int num_reply, | |
1fec7093 YS |
860 | struct rbd_req_coll *coll, |
861 | int coll_index, | |
602adf40 | 862 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
863 | struct ceph_msg *msg), |
864 | struct ceph_osd_request **linger_req, | |
865 | u64 *ver) | |
602adf40 YS |
866 | { |
867 | struct ceph_osd_request *req; | |
868 | struct ceph_file_layout *layout; | |
869 | int ret; | |
870 | u64 bno; | |
871 | struct timespec mtime = CURRENT_TIME; | |
872 | struct rbd_request *req_data; | |
873 | struct ceph_osd_request_head *reqhead; | |
1dbb4399 | 874 | struct ceph_osd_client *osdc; |
602adf40 | 875 | |
602adf40 | 876 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
877 | if (!req_data) { |
878 | if (coll) | |
879 | rbd_coll_end_req_index(rq, coll, coll_index, | |
880 | -ENOMEM, len); | |
881 | return -ENOMEM; | |
882 | } | |
883 | ||
884 | if (coll) { | |
885 | req_data->coll = coll; | |
886 | req_data->coll_index = coll_index; | |
887 | } | |
602adf40 | 888 | |
1fec7093 | 889 | dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs); |
602adf40 | 890 | |
c666601a | 891 | down_read(&dev->header_rwsem); |
602adf40 | 892 | |
1dbb4399 AE |
893 | osdc = &dev->rbd_client->client->osdc; |
894 | req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, | |
895 | false, GFP_NOIO, pages, bio); | |
4ad12621 | 896 | if (!req) { |
c666601a | 897 | up_read(&dev->header_rwsem); |
4ad12621 | 898 | ret = -ENOMEM; |
602adf40 YS |
899 | goto done_pages; |
900 | } | |
901 | ||
902 | req->r_callback = rbd_cb; | |
903 | ||
904 | req_data->rq = rq; | |
905 | req_data->bio = bio; | |
906 | req_data->pages = pages; | |
907 | req_data->len = len; | |
908 | ||
909 | req->r_priv = req_data; | |
910 | ||
911 | reqhead = req->r_request->front.iov_base; | |
912 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
913 | ||
914 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); | |
915 | req->r_oid_len = strlen(req->r_oid); | |
916 | ||
917 | layout = &req->r_file_layout; | |
918 | memset(layout, 0, sizeof(*layout)); | |
919 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
920 | layout->fl_stripe_count = cpu_to_le32(1); | |
921 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
9bb2f334 | 922 | layout->fl_pg_pool = cpu_to_le32(dev->pool_id); |
1dbb4399 AE |
923 | ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno, |
924 | req, ops); | |
602adf40 YS |
925 | |
926 | ceph_osdc_build_request(req, ofs, &len, | |
927 | ops, | |
928 | snapc, | |
929 | &mtime, | |
930 | req->r_oid, req->r_oid_len); | |
c666601a | 931 | up_read(&dev->header_rwsem); |
602adf40 | 932 | |
59c2be1e | 933 | if (linger_req) { |
1dbb4399 | 934 | ceph_osdc_set_request_linger(osdc, req); |
59c2be1e YS |
935 | *linger_req = req; |
936 | } | |
937 | ||
1dbb4399 | 938 | ret = ceph_osdc_start_request(osdc, req, false); |
602adf40 YS |
939 | if (ret < 0) |
940 | goto done_err; | |
941 | ||
942 | if (!rbd_cb) { | |
1dbb4399 | 943 | ret = ceph_osdc_wait_request(osdc, req); |
59c2be1e YS |
944 | if (ver) |
945 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
1fec7093 YS |
946 | dout("reassert_ver=%lld\n", |
947 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
948 | ceph_osdc_put_request(req); |
949 | } | |
950 | return ret; | |
951 | ||
952 | done_err: | |
953 | bio_chain_put(req_data->bio); | |
954 | ceph_osdc_put_request(req); | |
955 | done_pages: | |
1fec7093 | 956 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 957 | kfree(req_data); |
602adf40 YS |
958 | return ret; |
959 | } | |
960 | ||
961 | /* | |
962 | * Ceph osd op callback | |
963 | */ | |
964 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
965 | { | |
966 | struct rbd_request *req_data = req->r_priv; | |
967 | struct ceph_osd_reply_head *replyhead; | |
968 | struct ceph_osd_op *op; | |
969 | __s32 rc; | |
970 | u64 bytes; | |
971 | int read_op; | |
972 | ||
973 | /* parse reply */ | |
974 | replyhead = msg->front.iov_base; | |
975 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
976 | op = (void *)(replyhead + 1); | |
977 | rc = le32_to_cpu(replyhead->result); | |
978 | bytes = le64_to_cpu(op->extent.length); | |
895cfcc8 | 979 | read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); |
602adf40 YS |
980 | |
981 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
982 | ||
983 | if (rc == -ENOENT && read_op) { | |
984 | zero_bio_chain(req_data->bio, 0); | |
985 | rc = 0; | |
986 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
987 | zero_bio_chain(req_data->bio, bytes); | |
988 | bytes = req_data->len; | |
989 | } | |
990 | ||
1fec7093 | 991 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
992 | |
993 | if (req_data->bio) | |
994 | bio_chain_put(req_data->bio); | |
995 | ||
996 | ceph_osdc_put_request(req); | |
997 | kfree(req_data); | |
998 | } | |
999 | ||
59c2be1e YS |
1000 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
1001 | { | |
1002 | ceph_osdc_put_request(req); | |
1003 | } | |
1004 | ||
602adf40 YS |
1005 | /* |
1006 | * Do a synchronous ceph osd operation | |
1007 | */ | |
1008 | static int rbd_req_sync_op(struct rbd_device *dev, | |
1009 | struct ceph_snap_context *snapc, | |
1010 | u64 snapid, | |
1011 | int opcode, | |
1012 | int flags, | |
1013 | struct ceph_osd_req_op *orig_ops, | |
1014 | int num_reply, | |
1015 | const char *obj, | |
1016 | u64 ofs, u64 len, | |
59c2be1e YS |
1017 | char *buf, |
1018 | struct ceph_osd_request **linger_req, | |
1019 | u64 *ver) | |
602adf40 YS |
1020 | { |
1021 | int ret; | |
1022 | struct page **pages; | |
1023 | int num_pages; | |
1024 | struct ceph_osd_req_op *ops = orig_ops; | |
1025 | u32 payload_len; | |
1026 | ||
1027 | num_pages = calc_pages_for(ofs , len); | |
1028 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1029 | if (IS_ERR(pages)) |
1030 | return PTR_ERR(pages); | |
602adf40 YS |
1031 | |
1032 | if (!orig_ops) { | |
1033 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
1034 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1035 | if (ret < 0) | |
1036 | goto done; | |
1037 | ||
1038 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
1039 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
1040 | if (ret < 0) | |
1041 | goto done_ops; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | ret = rbd_do_request(NULL, dev, snapc, snapid, | |
1046 | obj, ofs, len, NULL, | |
1047 | pages, num_pages, | |
1048 | flags, | |
1049 | ops, | |
1050 | 2, | |
1fec7093 | 1051 | NULL, 0, |
59c2be1e YS |
1052 | NULL, |
1053 | linger_req, ver); | |
602adf40 YS |
1054 | if (ret < 0) |
1055 | goto done_ops; | |
1056 | ||
1057 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1058 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1059 | ||
1060 | done_ops: | |
1061 | if (!orig_ops) | |
1062 | rbd_destroy_ops(ops); | |
1063 | done: | |
1064 | ceph_release_page_vector(pages, num_pages); | |
1065 | return ret; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Do an asynchronous ceph osd operation | |
1070 | */ | |
1071 | static int rbd_do_op(struct request *rq, | |
1072 | struct rbd_device *rbd_dev , | |
1073 | struct ceph_snap_context *snapc, | |
1074 | u64 snapid, | |
1075 | int opcode, int flags, int num_reply, | |
1076 | u64 ofs, u64 len, | |
1fec7093 YS |
1077 | struct bio *bio, |
1078 | struct rbd_req_coll *coll, | |
1079 | int coll_index) | |
602adf40 YS |
1080 | { |
1081 | char *seg_name; | |
1082 | u64 seg_ofs; | |
1083 | u64 seg_len; | |
1084 | int ret; | |
1085 | struct ceph_osd_req_op *ops; | |
1086 | u32 payload_len; | |
1087 | ||
1088 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1089 | if (!seg_name) | |
1090 | return -ENOMEM; | |
1091 | ||
1092 | seg_len = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1093 | rbd_dev->header.object_prefix, |
602adf40 YS |
1094 | ofs, len, |
1095 | seg_name, &seg_ofs); | |
602adf40 YS |
1096 | |
1097 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1098 | ||
1099 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1100 | if (ret < 0) | |
1101 | goto done; | |
1102 | ||
1103 | /* we've taken care of segment sizes earlier when we | |
1104 | cloned the bios. We should never have a segment | |
1105 | truncated at this point */ | |
1106 | BUG_ON(seg_len < len); | |
1107 | ||
1108 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1109 | seg_name, seg_ofs, seg_len, | |
1110 | bio, | |
1111 | NULL, 0, | |
1112 | flags, | |
1113 | ops, | |
1114 | num_reply, | |
1fec7093 | 1115 | coll, coll_index, |
59c2be1e | 1116 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1117 | |
1118 | rbd_destroy_ops(ops); | |
602adf40 YS |
1119 | done: |
1120 | kfree(seg_name); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Request async osd write | |
1126 | */ | |
1127 | static int rbd_req_write(struct request *rq, | |
1128 | struct rbd_device *rbd_dev, | |
1129 | struct ceph_snap_context *snapc, | |
1130 | u64 ofs, u64 len, | |
1fec7093 YS |
1131 | struct bio *bio, |
1132 | struct rbd_req_coll *coll, | |
1133 | int coll_index) | |
602adf40 YS |
1134 | { |
1135 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1136 | CEPH_OSD_OP_WRITE, | |
1137 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1138 | 2, | |
1fec7093 | 1139 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1140 | } |
1141 | ||
1142 | /* | |
1143 | * Request async osd read | |
1144 | */ | |
1145 | static int rbd_req_read(struct request *rq, | |
1146 | struct rbd_device *rbd_dev, | |
1147 | u64 snapid, | |
1148 | u64 ofs, u64 len, | |
1fec7093 YS |
1149 | struct bio *bio, |
1150 | struct rbd_req_coll *coll, | |
1151 | int coll_index) | |
602adf40 YS |
1152 | { |
1153 | return rbd_do_op(rq, rbd_dev, NULL, | |
b06e6a6b | 1154 | snapid, |
602adf40 YS |
1155 | CEPH_OSD_OP_READ, |
1156 | CEPH_OSD_FLAG_READ, | |
1157 | 2, | |
1fec7093 | 1158 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1159 | } |
1160 | ||
1161 | /* | |
1162 | * Request sync osd read | |
1163 | */ | |
1164 | static int rbd_req_sync_read(struct rbd_device *dev, | |
1165 | struct ceph_snap_context *snapc, | |
1166 | u64 snapid, | |
1167 | const char *obj, | |
1168 | u64 ofs, u64 len, | |
59c2be1e YS |
1169 | char *buf, |
1170 | u64 *ver) | |
602adf40 YS |
1171 | { |
1172 | return rbd_req_sync_op(dev, NULL, | |
b06e6a6b | 1173 | snapid, |
602adf40 YS |
1174 | CEPH_OSD_OP_READ, |
1175 | CEPH_OSD_FLAG_READ, | |
1176 | NULL, | |
59c2be1e | 1177 | 1, obj, ofs, len, buf, NULL, ver); |
602adf40 YS |
1178 | } |
1179 | ||
1180 | /* | |
59c2be1e YS |
1181 | * Request sync osd watch |
1182 | */ | |
1183 | static int rbd_req_sync_notify_ack(struct rbd_device *dev, | |
1184 | u64 ver, | |
1185 | u64 notify_id, | |
1186 | const char *obj) | |
1187 | { | |
1188 | struct ceph_osd_req_op *ops; | |
11f77002 SW |
1189 | int ret; |
1190 | ||
1191 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); | |
59c2be1e YS |
1192 | if (ret < 0) |
1193 | return ret; | |
1194 | ||
1195 | ops[0].watch.ver = cpu_to_le64(dev->header.obj_version); | |
1196 | ops[0].watch.cookie = notify_id; | |
1197 | ops[0].watch.flag = 0; | |
1198 | ||
1199 | ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP, | |
1200 | obj, 0, 0, NULL, | |
ad4f232f | 1201 | NULL, 0, |
59c2be1e YS |
1202 | CEPH_OSD_FLAG_READ, |
1203 | ops, | |
1204 | 1, | |
1fec7093 | 1205 | NULL, 0, |
59c2be1e YS |
1206 | rbd_simple_req_cb, 0, NULL); |
1207 | ||
1208 | rbd_destroy_ops(ops); | |
1209 | return ret; | |
1210 | } | |
1211 | ||
1212 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1213 | { | |
1214 | struct rbd_device *dev = (struct rbd_device *)data; | |
13143d2d SW |
1215 | int rc; |
1216 | ||
59c2be1e YS |
1217 | if (!dev) |
1218 | return; | |
1219 | ||
1220 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1221 | notify_id, (int)opcode); | |
1222 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
263c6ca0 | 1223 | rc = __rbd_refresh_header(dev); |
59c2be1e | 1224 | mutex_unlock(&ctl_mutex); |
13143d2d | 1225 | if (rc) |
f0f8cef5 AE |
1226 | pr_warning(RBD_DRV_NAME "%d got notification but failed to " |
1227 | " update snaps: %d\n", dev->major, rc); | |
59c2be1e YS |
1228 | |
1229 | rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name); | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * Request sync osd watch | |
1234 | */ | |
1235 | static int rbd_req_sync_watch(struct rbd_device *dev, | |
1236 | const char *obj, | |
1237 | u64 ver) | |
1238 | { | |
1239 | struct ceph_osd_req_op *ops; | |
1dbb4399 | 1240 | struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc; |
59c2be1e YS |
1241 | |
1242 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1243 | if (ret < 0) | |
1244 | return ret; | |
1245 | ||
1246 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
1247 | (void *)dev, &dev->watch_event); | |
1248 | if (ret < 0) | |
1249 | goto fail; | |
1250 | ||
1251 | ops[0].watch.ver = cpu_to_le64(ver); | |
1252 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); | |
1253 | ops[0].watch.flag = 1; | |
1254 | ||
1255 | ret = rbd_req_sync_op(dev, NULL, | |
1256 | CEPH_NOSNAP, | |
1257 | 0, | |
1258 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1259 | ops, | |
1260 | 1, obj, 0, 0, NULL, | |
1261 | &dev->watch_request, NULL); | |
1262 | ||
1263 | if (ret < 0) | |
1264 | goto fail_event; | |
1265 | ||
1266 | rbd_destroy_ops(ops); | |
1267 | return 0; | |
1268 | ||
1269 | fail_event: | |
1270 | ceph_osdc_cancel_event(dev->watch_event); | |
1271 | dev->watch_event = NULL; | |
1272 | fail: | |
1273 | rbd_destroy_ops(ops); | |
1274 | return ret; | |
1275 | } | |
1276 | ||
79e3057c YS |
1277 | /* |
1278 | * Request sync osd unwatch | |
1279 | */ | |
1280 | static int rbd_req_sync_unwatch(struct rbd_device *dev, | |
1281 | const char *obj) | |
1282 | { | |
1283 | struct ceph_osd_req_op *ops; | |
1284 | ||
1285 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1286 | if (ret < 0) | |
1287 | return ret; | |
1288 | ||
1289 | ops[0].watch.ver = 0; | |
1290 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); | |
1291 | ops[0].watch.flag = 0; | |
1292 | ||
1293 | ret = rbd_req_sync_op(dev, NULL, | |
1294 | CEPH_NOSNAP, | |
1295 | 0, | |
1296 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1297 | ops, | |
1298 | 1, obj, 0, 0, NULL, NULL, NULL); | |
1299 | ||
1300 | rbd_destroy_ops(ops); | |
1301 | ceph_osdc_cancel_event(dev->watch_event); | |
1302 | dev->watch_event = NULL; | |
1303 | return ret; | |
1304 | } | |
1305 | ||
59c2be1e YS |
1306 | struct rbd_notify_info { |
1307 | struct rbd_device *dev; | |
1308 | }; | |
1309 | ||
1310 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1311 | { | |
1312 | struct rbd_device *dev = (struct rbd_device *)data; | |
1313 | if (!dev) | |
1314 | return; | |
1315 | ||
1316 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1317 | notify_id, (int)opcode); | |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Request sync osd notify | |
1322 | */ | |
1323 | static int rbd_req_sync_notify(struct rbd_device *dev, | |
1324 | const char *obj) | |
1325 | { | |
1326 | struct ceph_osd_req_op *ops; | |
1dbb4399 | 1327 | struct ceph_osd_client *osdc = &dev->rbd_client->client->osdc; |
59c2be1e YS |
1328 | struct ceph_osd_event *event; |
1329 | struct rbd_notify_info info; | |
1330 | int payload_len = sizeof(u32) + sizeof(u32); | |
1331 | int ret; | |
1332 | ||
1333 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); | |
1334 | if (ret < 0) | |
1335 | return ret; | |
1336 | ||
1337 | info.dev = dev; | |
1338 | ||
1339 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1340 | (void *)&info, &event); | |
1341 | if (ret < 0) | |
1342 | goto fail; | |
1343 | ||
1344 | ops[0].watch.ver = 1; | |
1345 | ops[0].watch.flag = 1; | |
1346 | ops[0].watch.cookie = event->cookie; | |
1347 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1348 | ops[0].watch.timeout = 12; | |
1349 | ||
1350 | ret = rbd_req_sync_op(dev, NULL, | |
1351 | CEPH_NOSNAP, | |
1352 | 0, | |
1353 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1354 | ops, | |
1355 | 1, obj, 0, 0, NULL, NULL, NULL); | |
1356 | if (ret < 0) | |
1357 | goto fail_event; | |
1358 | ||
1359 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1360 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1361 | rbd_destroy_ops(ops); | |
1362 | return 0; | |
1363 | ||
1364 | fail_event: | |
1365 | ceph_osdc_cancel_event(event); | |
1366 | fail: | |
1367 | rbd_destroy_ops(ops); | |
1368 | return ret; | |
1369 | } | |
1370 | ||
602adf40 YS |
1371 | /* |
1372 | * Request sync osd read | |
1373 | */ | |
1374 | static int rbd_req_sync_exec(struct rbd_device *dev, | |
1375 | const char *obj, | |
1376 | const char *cls, | |
1377 | const char *method, | |
1378 | const char *data, | |
59c2be1e YS |
1379 | int len, |
1380 | u64 *ver) | |
602adf40 YS |
1381 | { |
1382 | struct ceph_osd_req_op *ops; | |
1383 | int cls_len = strlen(cls); | |
1384 | int method_len = strlen(method); | |
1385 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
1386 | cls_len + method_len + len); | |
1387 | if (ret < 0) | |
1388 | return ret; | |
1389 | ||
1390 | ops[0].cls.class_name = cls; | |
1391 | ops[0].cls.class_len = (__u8)cls_len; | |
1392 | ops[0].cls.method_name = method; | |
1393 | ops[0].cls.method_len = (__u8)method_len; | |
1394 | ops[0].cls.argc = 0; | |
1395 | ops[0].cls.indata = data; | |
1396 | ops[0].cls.indata_len = len; | |
1397 | ||
1398 | ret = rbd_req_sync_op(dev, NULL, | |
1399 | CEPH_NOSNAP, | |
1400 | 0, | |
1401 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1402 | ops, | |
59c2be1e | 1403 | 1, obj, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1404 | |
1405 | rbd_destroy_ops(ops); | |
1406 | ||
1407 | dout("cls_exec returned %d\n", ret); | |
1408 | return ret; | |
1409 | } | |
1410 | ||
1fec7093 YS |
1411 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1412 | { | |
1413 | struct rbd_req_coll *coll = | |
1414 | kzalloc(sizeof(struct rbd_req_coll) + | |
1415 | sizeof(struct rbd_req_status) * num_reqs, | |
1416 | GFP_ATOMIC); | |
1417 | ||
1418 | if (!coll) | |
1419 | return NULL; | |
1420 | coll->total = num_reqs; | |
1421 | kref_init(&coll->kref); | |
1422 | return coll; | |
1423 | } | |
1424 | ||
602adf40 YS |
1425 | /* |
1426 | * block device queue callback | |
1427 | */ | |
1428 | static void rbd_rq_fn(struct request_queue *q) | |
1429 | { | |
1430 | struct rbd_device *rbd_dev = q->queuedata; | |
1431 | struct request *rq; | |
1432 | struct bio_pair *bp = NULL; | |
1433 | ||
00f1f36f | 1434 | while ((rq = blk_fetch_request(q))) { |
602adf40 YS |
1435 | struct bio *bio; |
1436 | struct bio *rq_bio, *next_bio = NULL; | |
1437 | bool do_write; | |
1438 | int size, op_size = 0; | |
1439 | u64 ofs; | |
1fec7093 YS |
1440 | int num_segs, cur_seg = 0; |
1441 | struct rbd_req_coll *coll; | |
602adf40 YS |
1442 | |
1443 | /* peek at request from block layer */ | |
1444 | if (!rq) | |
1445 | break; | |
1446 | ||
1447 | dout("fetched request\n"); | |
1448 | ||
1449 | /* filter out block requests we don't understand */ | |
1450 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1451 | __blk_end_request_all(rq, 0); | |
00f1f36f | 1452 | continue; |
602adf40 YS |
1453 | } |
1454 | ||
1455 | /* deduce our operation (read, write) */ | |
1456 | do_write = (rq_data_dir(rq) == WRITE); | |
1457 | ||
1458 | size = blk_rq_bytes(rq); | |
593a9e7b | 1459 | ofs = blk_rq_pos(rq) * SECTOR_SIZE; |
602adf40 YS |
1460 | rq_bio = rq->bio; |
1461 | if (do_write && rbd_dev->read_only) { | |
1462 | __blk_end_request_all(rq, -EROFS); | |
00f1f36f | 1463 | continue; |
602adf40 YS |
1464 | } |
1465 | ||
1466 | spin_unlock_irq(q->queue_lock); | |
1467 | ||
1468 | dout("%s 0x%x bytes at 0x%llx\n", | |
1469 | do_write ? "write" : "read", | |
593a9e7b | 1470 | size, blk_rq_pos(rq) * SECTOR_SIZE); |
602adf40 | 1471 | |
1fec7093 YS |
1472 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1473 | coll = rbd_alloc_coll(num_segs); | |
1474 | if (!coll) { | |
1475 | spin_lock_irq(q->queue_lock); | |
1476 | __blk_end_request_all(rq, -ENOMEM); | |
00f1f36f | 1477 | continue; |
1fec7093 YS |
1478 | } |
1479 | ||
602adf40 YS |
1480 | do { |
1481 | /* a bio clone to be passed down to OSD req */ | |
1482 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1483 | op_size = rbd_get_segment(&rbd_dev->header, | |
ca1e49a6 | 1484 | rbd_dev->header.object_prefix, |
602adf40 YS |
1485 | ofs, size, |
1486 | NULL, NULL); | |
1fec7093 | 1487 | kref_get(&coll->kref); |
602adf40 YS |
1488 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1489 | op_size, GFP_ATOMIC); | |
1490 | if (!bio) { | |
1fec7093 YS |
1491 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1492 | -ENOMEM, op_size); | |
1493 | goto next_seg; | |
602adf40 YS |
1494 | } |
1495 | ||
1fec7093 | 1496 | |
602adf40 YS |
1497 | /* init OSD command: write or read */ |
1498 | if (do_write) | |
1499 | rbd_req_write(rq, rbd_dev, | |
1500 | rbd_dev->header.snapc, | |
1501 | ofs, | |
1fec7093 YS |
1502 | op_size, bio, |
1503 | coll, cur_seg); | |
602adf40 YS |
1504 | else |
1505 | rbd_req_read(rq, rbd_dev, | |
77dfe99f | 1506 | rbd_dev->snap_id, |
602adf40 | 1507 | ofs, |
1fec7093 YS |
1508 | op_size, bio, |
1509 | coll, cur_seg); | |
602adf40 | 1510 | |
1fec7093 | 1511 | next_seg: |
602adf40 YS |
1512 | size -= op_size; |
1513 | ofs += op_size; | |
1514 | ||
1fec7093 | 1515 | cur_seg++; |
602adf40 YS |
1516 | rq_bio = next_bio; |
1517 | } while (size > 0); | |
1fec7093 | 1518 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1519 | |
1520 | if (bp) | |
1521 | bio_pair_release(bp); | |
602adf40 | 1522 | spin_lock_irq(q->queue_lock); |
602adf40 YS |
1523 | } |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1528 | * multiple osd objects. One exception would be with a single page bios, | |
1529 | * which we handle later at bio_chain_clone | |
1530 | */ | |
1531 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1532 | struct bio_vec *bvec) | |
1533 | { | |
1534 | struct rbd_device *rbd_dev = q->queuedata; | |
593a9e7b AE |
1535 | unsigned int chunk_sectors; |
1536 | sector_t sector; | |
1537 | unsigned int bio_sectors; | |
602adf40 YS |
1538 | int max; |
1539 | ||
593a9e7b AE |
1540 | chunk_sectors = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
1541 | sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1542 | bio_sectors = bmd->bi_size >> SECTOR_SHIFT; | |
1543 | ||
602adf40 | 1544 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) |
593a9e7b | 1545 | + bio_sectors)) << SECTOR_SHIFT; |
602adf40 YS |
1546 | if (max < 0) |
1547 | max = 0; /* bio_add cannot handle a negative return */ | |
1548 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1549 | return bvec->bv_len; | |
1550 | return max; | |
1551 | } | |
1552 | ||
1553 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1554 | { | |
1555 | struct gendisk *disk = rbd_dev->disk; | |
1556 | ||
1557 | if (!disk) | |
1558 | return; | |
1559 | ||
1560 | rbd_header_free(&rbd_dev->header); | |
1561 | ||
1562 | if (disk->flags & GENHD_FL_UP) | |
1563 | del_gendisk(disk); | |
1564 | if (disk->queue) | |
1565 | blk_cleanup_queue(disk->queue); | |
1566 | put_disk(disk); | |
1567 | } | |
1568 | ||
1569 | /* | |
1570 | * reload the ondisk the header | |
1571 | */ | |
1572 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1573 | struct rbd_image_header *header) | |
1574 | { | |
1575 | ssize_t rc; | |
1576 | struct rbd_image_header_ondisk *dh; | |
50f7c4c9 | 1577 | u32 snap_count = 0; |
59c2be1e | 1578 | u64 ver; |
00f1f36f | 1579 | size_t len; |
602adf40 | 1580 | |
00f1f36f AE |
1581 | /* |
1582 | * First reads the fixed-size header to determine the number | |
1583 | * of snapshots, then re-reads it, along with all snapshot | |
1584 | * records as well as their stored names. | |
1585 | */ | |
1586 | len = sizeof (*dh); | |
602adf40 | 1587 | while (1) { |
602adf40 YS |
1588 | dh = kmalloc(len, GFP_KERNEL); |
1589 | if (!dh) | |
1590 | return -ENOMEM; | |
1591 | ||
1592 | rc = rbd_req_sync_read(rbd_dev, | |
1593 | NULL, CEPH_NOSNAP, | |
1594 | rbd_dev->obj_md_name, | |
1595 | 0, len, | |
59c2be1e | 1596 | (char *)dh, &ver); |
602adf40 YS |
1597 | if (rc < 0) |
1598 | goto out_dh; | |
1599 | ||
1600 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
81e759fb | 1601 | if (rc < 0) { |
00f1f36f | 1602 | if (rc == -ENXIO) |
81e759fb JD |
1603 | pr_warning("unrecognized header format" |
1604 | " for image %s", rbd_dev->obj); | |
602adf40 | 1605 | goto out_dh; |
81e759fb | 1606 | } |
602adf40 | 1607 | |
00f1f36f AE |
1608 | if (snap_count == header->total_snaps) |
1609 | break; | |
1610 | ||
1611 | snap_count = header->total_snaps; | |
1612 | len = sizeof (*dh) + | |
1613 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1614 | header->snap_names_len; | |
1615 | ||
1616 | rbd_header_free(header); | |
1617 | kfree(dh); | |
602adf40 | 1618 | } |
59c2be1e | 1619 | header->obj_version = ver; |
602adf40 YS |
1620 | |
1621 | out_dh: | |
1622 | kfree(dh); | |
1623 | return rc; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * create a snapshot | |
1628 | */ | |
1629 | static int rbd_header_add_snap(struct rbd_device *dev, | |
1630 | const char *snap_name, | |
1631 | gfp_t gfp_flags) | |
1632 | { | |
1633 | int name_len = strlen(snap_name); | |
1634 | u64 new_snapid; | |
1635 | int ret; | |
916d4d67 | 1636 | void *data, *p, *e; |
59c2be1e | 1637 | u64 ver; |
1dbb4399 | 1638 | struct ceph_mon_client *monc; |
602adf40 YS |
1639 | |
1640 | /* we should create a snapshot only if we're pointing at the head */ | |
77dfe99f | 1641 | if (dev->snap_id != CEPH_NOSNAP) |
602adf40 YS |
1642 | return -EINVAL; |
1643 | ||
1dbb4399 | 1644 | monc = &dev->rbd_client->client->monc; |
9bb2f334 | 1645 | ret = ceph_monc_create_snapid(monc, dev->pool_id, &new_snapid); |
602adf40 YS |
1646 | dout("created snapid=%lld\n", new_snapid); |
1647 | if (ret < 0) | |
1648 | return ret; | |
1649 | ||
1650 | data = kmalloc(name_len + 16, gfp_flags); | |
1651 | if (!data) | |
1652 | return -ENOMEM; | |
1653 | ||
916d4d67 SW |
1654 | p = data; |
1655 | e = data + name_len + 16; | |
602adf40 | 1656 | |
916d4d67 SW |
1657 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1658 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 YS |
1659 | |
1660 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", | |
916d4d67 | 1661 | data, p - data, &ver); |
602adf40 | 1662 | |
916d4d67 | 1663 | kfree(data); |
602adf40 YS |
1664 | |
1665 | if (ret < 0) | |
1666 | return ret; | |
1667 | ||
403f24d3 JD |
1668 | down_write(&dev->header_rwsem); |
1669 | dev->header.snapc->seq = new_snapid; | |
1670 | up_write(&dev->header_rwsem); | |
602adf40 YS |
1671 | |
1672 | return 0; | |
1673 | bad: | |
1674 | return -ERANGE; | |
1675 | } | |
1676 | ||
dfc5606d YS |
1677 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1678 | { | |
1679 | struct rbd_snap *snap; | |
1680 | ||
1681 | while (!list_empty(&rbd_dev->snaps)) { | |
1682 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); | |
1683 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1684 | } | |
1685 | } | |
1686 | ||
602adf40 YS |
1687 | /* |
1688 | * only read the first part of the ondisk header, without the snaps info | |
1689 | */ | |
263c6ca0 | 1690 | static int __rbd_refresh_header(struct rbd_device *rbd_dev) |
602adf40 YS |
1691 | { |
1692 | int ret; | |
1693 | struct rbd_image_header h; | |
1694 | u64 snap_seq; | |
59c2be1e | 1695 | int follow_seq = 0; |
602adf40 YS |
1696 | |
1697 | ret = rbd_read_header(rbd_dev, &h); | |
1698 | if (ret < 0) | |
1699 | return ret; | |
1700 | ||
9db4b3e3 | 1701 | /* resized? */ |
593a9e7b | 1702 | set_capacity(rbd_dev->disk, h.image_size / SECTOR_SIZE); |
9db4b3e3 | 1703 | |
c666601a | 1704 | down_write(&rbd_dev->header_rwsem); |
602adf40 YS |
1705 | |
1706 | snap_seq = rbd_dev->header.snapc->seq; | |
59c2be1e YS |
1707 | if (rbd_dev->header.total_snaps && |
1708 | rbd_dev->header.snapc->snaps[0] == snap_seq) | |
1709 | /* pointing at the head, will need to follow that | |
1710 | if head moves */ | |
1711 | follow_seq = 1; | |
602adf40 YS |
1712 | |
1713 | kfree(rbd_dev->header.snapc); | |
1714 | kfree(rbd_dev->header.snap_names); | |
1715 | kfree(rbd_dev->header.snap_sizes); | |
1716 | ||
1717 | rbd_dev->header.total_snaps = h.total_snaps; | |
1718 | rbd_dev->header.snapc = h.snapc; | |
1719 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1720 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1721 | rbd_dev->header.snap_sizes = h.snap_sizes; |
59c2be1e YS |
1722 | if (follow_seq) |
1723 | rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; | |
1724 | else | |
1725 | rbd_dev->header.snapc->seq = snap_seq; | |
602adf40 | 1726 | |
dfc5606d YS |
1727 | ret = __rbd_init_snaps_header(rbd_dev); |
1728 | ||
c666601a | 1729 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 1730 | |
dfc5606d | 1731 | return ret; |
602adf40 YS |
1732 | } |
1733 | ||
1734 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1735 | { | |
1736 | struct gendisk *disk; | |
1737 | struct request_queue *q; | |
1738 | int rc; | |
593a9e7b | 1739 | u64 segment_size; |
602adf40 YS |
1740 | u64 total_size = 0; |
1741 | ||
1742 | /* contact OSD, request size info about the object being mapped */ | |
1743 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1744 | if (rc) | |
1745 | return rc; | |
1746 | ||
dfc5606d YS |
1747 | /* no need to lock here, as rbd_dev is not registered yet */ |
1748 | rc = __rbd_init_snaps_header(rbd_dev); | |
1749 | if (rc) | |
1750 | return rc; | |
1751 | ||
cc9d734c | 1752 | rc = rbd_header_set_snap(rbd_dev, &total_size); |
602adf40 YS |
1753 | if (rc) |
1754 | return rc; | |
1755 | ||
1756 | /* create gendisk info */ | |
1757 | rc = -ENOMEM; | |
1758 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1759 | if (!disk) | |
1760 | goto out; | |
1761 | ||
f0f8cef5 | 1762 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
aedfec59 | 1763 | rbd_dev->id); |
602adf40 YS |
1764 | disk->major = rbd_dev->major; |
1765 | disk->first_minor = 0; | |
1766 | disk->fops = &rbd_bd_ops; | |
1767 | disk->private_data = rbd_dev; | |
1768 | ||
1769 | /* init rq */ | |
1770 | rc = -ENOMEM; | |
1771 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1772 | if (!q) | |
1773 | goto out_disk; | |
029bcbd8 | 1774 | |
593a9e7b AE |
1775 | /* We use the default size, but let's be explicit about it. */ |
1776 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
1777 | ||
029bcbd8 | 1778 | /* set io sizes to object size */ |
593a9e7b AE |
1779 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
1780 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
1781 | blk_queue_max_segment_size(q, segment_size); | |
1782 | blk_queue_io_min(q, segment_size); | |
1783 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 1784 | |
602adf40 YS |
1785 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1786 | disk->queue = q; | |
1787 | ||
1788 | q->queuedata = rbd_dev; | |
1789 | ||
1790 | rbd_dev->disk = disk; | |
1791 | rbd_dev->q = q; | |
1792 | ||
1793 | /* finally, announce the disk to the world */ | |
593a9e7b | 1794 | set_capacity(disk, total_size / SECTOR_SIZE); |
602adf40 YS |
1795 | add_disk(disk); |
1796 | ||
1797 | pr_info("%s: added with size 0x%llx\n", | |
1798 | disk->disk_name, (unsigned long long)total_size); | |
1799 | return 0; | |
1800 | ||
1801 | out_disk: | |
1802 | put_disk(disk); | |
1803 | out: | |
1804 | return rc; | |
1805 | } | |
1806 | ||
dfc5606d YS |
1807 | /* |
1808 | sysfs | |
1809 | */ | |
1810 | ||
593a9e7b AE |
1811 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
1812 | { | |
1813 | return container_of(dev, struct rbd_device, dev); | |
1814 | } | |
1815 | ||
dfc5606d YS |
1816 | static ssize_t rbd_size_show(struct device *dev, |
1817 | struct device_attribute *attr, char *buf) | |
1818 | { | |
593a9e7b | 1819 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1820 | |
1821 | return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); | |
1822 | } | |
1823 | ||
1824 | static ssize_t rbd_major_show(struct device *dev, | |
1825 | struct device_attribute *attr, char *buf) | |
1826 | { | |
593a9e7b | 1827 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 1828 | |
dfc5606d YS |
1829 | return sprintf(buf, "%d\n", rbd_dev->major); |
1830 | } | |
1831 | ||
1832 | static ssize_t rbd_client_id_show(struct device *dev, | |
1833 | struct device_attribute *attr, char *buf) | |
602adf40 | 1834 | { |
593a9e7b | 1835 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 1836 | |
1dbb4399 AE |
1837 | return sprintf(buf, "client%lld\n", |
1838 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
1839 | } |
1840 | ||
dfc5606d YS |
1841 | static ssize_t rbd_pool_show(struct device *dev, |
1842 | struct device_attribute *attr, char *buf) | |
602adf40 | 1843 | { |
593a9e7b | 1844 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1845 | |
1846 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1847 | } | |
1848 | ||
9bb2f334 AE |
1849 | static ssize_t rbd_pool_id_show(struct device *dev, |
1850 | struct device_attribute *attr, char *buf) | |
1851 | { | |
1852 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
1853 | ||
1854 | return sprintf(buf, "%d\n", rbd_dev->pool_id); | |
1855 | } | |
1856 | ||
dfc5606d YS |
1857 | static ssize_t rbd_name_show(struct device *dev, |
1858 | struct device_attribute *attr, char *buf) | |
1859 | { | |
593a9e7b | 1860 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1861 | |
1862 | return sprintf(buf, "%s\n", rbd_dev->obj); | |
1863 | } | |
1864 | ||
1865 | static ssize_t rbd_snap_show(struct device *dev, | |
1866 | struct device_attribute *attr, | |
1867 | char *buf) | |
1868 | { | |
593a9e7b | 1869 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1870 | |
1871 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1872 | } | |
1873 | ||
1874 | static ssize_t rbd_image_refresh(struct device *dev, | |
1875 | struct device_attribute *attr, | |
1876 | const char *buf, | |
1877 | size_t size) | |
1878 | { | |
593a9e7b | 1879 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
1880 | int rc; |
1881 | int ret = size; | |
602adf40 YS |
1882 | |
1883 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1884 | ||
263c6ca0 | 1885 | rc = __rbd_refresh_header(rbd_dev); |
dfc5606d YS |
1886 | if (rc < 0) |
1887 | ret = rc; | |
602adf40 | 1888 | |
dfc5606d YS |
1889 | mutex_unlock(&ctl_mutex); |
1890 | return ret; | |
1891 | } | |
602adf40 | 1892 | |
dfc5606d YS |
1893 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1894 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1895 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1896 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 1897 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d YS |
1898 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
1899 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1900 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1901 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1902 | |
1903 | static struct attribute *rbd_attrs[] = { | |
1904 | &dev_attr_size.attr, | |
1905 | &dev_attr_major.attr, | |
1906 | &dev_attr_client_id.attr, | |
1907 | &dev_attr_pool.attr, | |
9bb2f334 | 1908 | &dev_attr_pool_id.attr, |
dfc5606d YS |
1909 | &dev_attr_name.attr, |
1910 | &dev_attr_current_snap.attr, | |
1911 | &dev_attr_refresh.attr, | |
1912 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1913 | NULL |
1914 | }; | |
1915 | ||
1916 | static struct attribute_group rbd_attr_group = { | |
1917 | .attrs = rbd_attrs, | |
1918 | }; | |
1919 | ||
1920 | static const struct attribute_group *rbd_attr_groups[] = { | |
1921 | &rbd_attr_group, | |
1922 | NULL | |
1923 | }; | |
1924 | ||
1925 | static void rbd_sysfs_dev_release(struct device *dev) | |
1926 | { | |
1927 | } | |
1928 | ||
1929 | static struct device_type rbd_device_type = { | |
1930 | .name = "rbd", | |
1931 | .groups = rbd_attr_groups, | |
1932 | .release = rbd_sysfs_dev_release, | |
1933 | }; | |
1934 | ||
1935 | ||
1936 | /* | |
1937 | sysfs - snapshots | |
1938 | */ | |
1939 | ||
1940 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1941 | struct device_attribute *attr, | |
1942 | char *buf) | |
1943 | { | |
1944 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1945 | ||
3591538f | 1946 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
1947 | } |
1948 | ||
1949 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1950 | struct device_attribute *attr, | |
1951 | char *buf) | |
1952 | { | |
1953 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1954 | ||
3591538f | 1955 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
1956 | } |
1957 | ||
1958 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1959 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1960 | ||
1961 | static struct attribute *rbd_snap_attrs[] = { | |
1962 | &dev_attr_snap_size.attr, | |
1963 | &dev_attr_snap_id.attr, | |
1964 | NULL, | |
1965 | }; | |
1966 | ||
1967 | static struct attribute_group rbd_snap_attr_group = { | |
1968 | .attrs = rbd_snap_attrs, | |
1969 | }; | |
1970 | ||
1971 | static void rbd_snap_dev_release(struct device *dev) | |
1972 | { | |
1973 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1974 | kfree(snap->name); | |
1975 | kfree(snap); | |
1976 | } | |
1977 | ||
1978 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
1979 | &rbd_snap_attr_group, | |
1980 | NULL | |
1981 | }; | |
1982 | ||
1983 | static struct device_type rbd_snap_device_type = { | |
1984 | .groups = rbd_snap_attr_groups, | |
1985 | .release = rbd_snap_dev_release, | |
1986 | }; | |
1987 | ||
1988 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
1989 | struct rbd_snap *snap) | |
1990 | { | |
1991 | list_del(&snap->node); | |
1992 | device_unregister(&snap->dev); | |
1993 | } | |
1994 | ||
1995 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
1996 | struct rbd_snap *snap, | |
1997 | struct device *parent) | |
1998 | { | |
1999 | struct device *dev = &snap->dev; | |
2000 | int ret; | |
2001 | ||
2002 | dev->type = &rbd_snap_device_type; | |
2003 | dev->parent = parent; | |
2004 | dev->release = rbd_snap_dev_release; | |
2005 | dev_set_name(dev, "snap_%s", snap->name); | |
2006 | ret = device_register(dev); | |
2007 | ||
2008 | return ret; | |
2009 | } | |
2010 | ||
2011 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
2012 | int i, const char *name, | |
2013 | struct rbd_snap **snapp) | |
2014 | { | |
2015 | int ret; | |
2016 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
2017 | if (!snap) | |
2018 | return -ENOMEM; | |
2019 | snap->name = kstrdup(name, GFP_KERNEL); | |
2020 | snap->size = rbd_dev->header.snap_sizes[i]; | |
2021 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
2022 | if (device_is_registered(&rbd_dev->dev)) { | |
2023 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2024 | &rbd_dev->dev); | |
2025 | if (ret < 0) | |
2026 | goto err; | |
2027 | } | |
2028 | *snapp = snap; | |
2029 | return 0; | |
2030 | err: | |
2031 | kfree(snap->name); | |
2032 | kfree(snap); | |
2033 | return ret; | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * search for the previous snap in a null delimited string list | |
2038 | */ | |
2039 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
2040 | { | |
2041 | if (name < start + 2) | |
2042 | return NULL; | |
2043 | ||
2044 | name -= 2; | |
2045 | while (*name) { | |
2046 | if (name == start) | |
2047 | return start; | |
2048 | name--; | |
2049 | } | |
2050 | return name + 1; | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * compare the old list of snapshots that we have to what's in the header | |
2055 | * and update it accordingly. Note that the header holds the snapshots | |
2056 | * in a reverse order (from newest to oldest) and we need to go from | |
2057 | * older to new so that we don't get a duplicate snap name when | |
2058 | * doing the process (e.g., removed snapshot and recreated a new | |
2059 | * one with the same name. | |
2060 | */ | |
2061 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2062 | { | |
2063 | const char *name, *first_name; | |
2064 | int i = rbd_dev->header.total_snaps; | |
2065 | struct rbd_snap *snap, *old_snap = NULL; | |
2066 | int ret; | |
2067 | struct list_head *p, *n; | |
2068 | ||
2069 | first_name = rbd_dev->header.snap_names; | |
2070 | name = first_name + rbd_dev->header.snap_names_len; | |
2071 | ||
2072 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2073 | u64 cur_id; | |
2074 | ||
2075 | old_snap = list_entry(p, struct rbd_snap, node); | |
2076 | ||
2077 | if (i) | |
2078 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2079 | ||
2080 | if (!i || old_snap->id < cur_id) { | |
2081 | /* old_snap->id was skipped, thus was removed */ | |
2082 | __rbd_remove_snap_dev(rbd_dev, old_snap); | |
2083 | continue; | |
2084 | } | |
2085 | if (old_snap->id == cur_id) { | |
2086 | /* we have this snapshot already */ | |
2087 | i--; | |
2088 | name = rbd_prev_snap_name(name, first_name); | |
2089 | continue; | |
2090 | } | |
2091 | for (; i > 0; | |
2092 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2093 | if (!name) { | |
2094 | WARN_ON(1); | |
2095 | return -EINVAL; | |
2096 | } | |
2097 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2098 | /* snapshot removal? handle it above */ | |
2099 | if (cur_id >= old_snap->id) | |
2100 | break; | |
2101 | /* a new snapshot */ | |
2102 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2103 | if (ret < 0) | |
2104 | return ret; | |
2105 | ||
2106 | /* note that we add it backward so using n and not p */ | |
2107 | list_add(&snap->node, n); | |
2108 | p = &snap->node; | |
2109 | } | |
2110 | } | |
2111 | /* we're done going over the old snap list, just add what's left */ | |
2112 | for (; i > 0; i--) { | |
2113 | name = rbd_prev_snap_name(name, first_name); | |
2114 | if (!name) { | |
2115 | WARN_ON(1); | |
2116 | return -EINVAL; | |
2117 | } | |
2118 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2119 | if (ret < 0) | |
2120 | return ret; | |
2121 | list_add(&snap->node, &rbd_dev->snaps); | |
2122 | } | |
2123 | ||
2124 | return 0; | |
2125 | } | |
2126 | ||
dfc5606d YS |
2127 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
2128 | { | |
f0f8cef5 | 2129 | int ret; |
dfc5606d YS |
2130 | struct device *dev; |
2131 | struct rbd_snap *snap; | |
2132 | ||
2133 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2134 | dev = &rbd_dev->dev; | |
2135 | ||
2136 | dev->bus = &rbd_bus_type; | |
2137 | dev->type = &rbd_device_type; | |
2138 | dev->parent = &rbd_root_dev; | |
2139 | dev->release = rbd_dev_release; | |
2140 | dev_set_name(dev, "%d", rbd_dev->id); | |
2141 | ret = device_register(dev); | |
2142 | if (ret < 0) | |
f0f8cef5 | 2143 | goto out; |
dfc5606d YS |
2144 | |
2145 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2146 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2147 | &rbd_dev->dev); | |
2148 | if (ret < 0) | |
602adf40 YS |
2149 | break; |
2150 | } | |
f0f8cef5 | 2151 | out: |
dfc5606d YS |
2152 | mutex_unlock(&ctl_mutex); |
2153 | return ret; | |
602adf40 YS |
2154 | } |
2155 | ||
dfc5606d YS |
2156 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2157 | { | |
2158 | device_unregister(&rbd_dev->dev); | |
2159 | } | |
2160 | ||
59c2be1e YS |
2161 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2162 | { | |
2163 | int ret, rc; | |
2164 | ||
2165 | do { | |
2166 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name, | |
2167 | rbd_dev->header.obj_version); | |
2168 | if (ret == -ERANGE) { | |
2169 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
263c6ca0 | 2170 | rc = __rbd_refresh_header(rbd_dev); |
59c2be1e YS |
2171 | mutex_unlock(&ctl_mutex); |
2172 | if (rc < 0) | |
2173 | return rc; | |
2174 | } | |
2175 | } while (ret == -ERANGE); | |
2176 | ||
2177 | return ret; | |
2178 | } | |
2179 | ||
1ddbe94e AE |
2180 | static atomic64_t rbd_id_max = ATOMIC64_INIT(0); |
2181 | ||
2182 | /* | |
499afd5b AE |
2183 | * Get a unique rbd identifier for the given new rbd_dev, and add |
2184 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 2185 | */ |
499afd5b | 2186 | static void rbd_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 2187 | { |
499afd5b AE |
2188 | rbd_dev->id = atomic64_inc_return(&rbd_id_max); |
2189 | ||
2190 | spin_lock(&rbd_dev_list_lock); | |
2191 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2192 | spin_unlock(&rbd_dev_list_lock); | |
1ddbe94e | 2193 | } |
b7f23c36 | 2194 | |
1ddbe94e | 2195 | /* |
499afd5b AE |
2196 | * Remove an rbd_dev from the global list, and record that its |
2197 | * identifier is no longer in use. | |
1ddbe94e | 2198 | */ |
499afd5b | 2199 | static void rbd_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 2200 | { |
d184f6bf AE |
2201 | struct list_head *tmp; |
2202 | int rbd_id = rbd_dev->id; | |
2203 | int max_id; | |
2204 | ||
2205 | BUG_ON(rbd_id < 1); | |
499afd5b AE |
2206 | |
2207 | spin_lock(&rbd_dev_list_lock); | |
2208 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
2209 | |
2210 | /* | |
2211 | * If the id being "put" is not the current maximum, there | |
2212 | * is nothing special we need to do. | |
2213 | */ | |
2214 | if (rbd_id != atomic64_read(&rbd_id_max)) { | |
2215 | spin_unlock(&rbd_dev_list_lock); | |
2216 | return; | |
2217 | } | |
2218 | ||
2219 | /* | |
2220 | * We need to update the current maximum id. Search the | |
2221 | * list to find out what it is. We're more likely to find | |
2222 | * the maximum at the end, so search the list backward. | |
2223 | */ | |
2224 | max_id = 0; | |
2225 | list_for_each_prev(tmp, &rbd_dev_list) { | |
2226 | struct rbd_device *rbd_dev; | |
2227 | ||
2228 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2229 | if (rbd_id > max_id) | |
2230 | max_id = rbd_id; | |
2231 | } | |
499afd5b | 2232 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 2233 | |
1ddbe94e | 2234 | /* |
d184f6bf AE |
2235 | * The max id could have been updated by rbd_id_get(), in |
2236 | * which case it now accurately reflects the new maximum. | |
2237 | * Be careful not to overwrite the maximum value in that | |
2238 | * case. | |
1ddbe94e | 2239 | */ |
d184f6bf | 2240 | atomic64_cmpxchg(&rbd_id_max, rbd_id, max_id); |
b7f23c36 AE |
2241 | } |
2242 | ||
e28fff26 AE |
2243 | /* |
2244 | * Skips over white space at *buf, and updates *buf to point to the | |
2245 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
2246 | * the token (string of non-white space characters) found. Note |
2247 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
2248 | */ |
2249 | static inline size_t next_token(const char **buf) | |
2250 | { | |
2251 | /* | |
2252 | * These are the characters that produce nonzero for | |
2253 | * isspace() in the "C" and "POSIX" locales. | |
2254 | */ | |
2255 | const char *spaces = " \f\n\r\t\v"; | |
2256 | ||
2257 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
2258 | ||
2259 | return strcspn(*buf, spaces); /* Return token length */ | |
2260 | } | |
2261 | ||
2262 | /* | |
2263 | * Finds the next token in *buf, and if the provided token buffer is | |
2264 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
2265 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
2266 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
2267 | * |
2268 | * Returns the length of the token found (not including the '\0'). | |
2269 | * Return value will be 0 if no token is found, and it will be >= | |
2270 | * token_size if the token would not fit. | |
2271 | * | |
593a9e7b | 2272 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
2273 | * found token. Note that this occurs even if the token buffer is |
2274 | * too small to hold it. | |
2275 | */ | |
2276 | static inline size_t copy_token(const char **buf, | |
2277 | char *token, | |
2278 | size_t token_size) | |
2279 | { | |
2280 | size_t len; | |
2281 | ||
2282 | len = next_token(buf); | |
2283 | if (len < token_size) { | |
2284 | memcpy(token, *buf, len); | |
2285 | *(token + len) = '\0'; | |
2286 | } | |
2287 | *buf += len; | |
2288 | ||
2289 | return len; | |
2290 | } | |
2291 | ||
ea3352f4 AE |
2292 | /* |
2293 | * Finds the next token in *buf, dynamically allocates a buffer big | |
2294 | * enough to hold a copy of it, and copies the token into the new | |
2295 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
2296 | * that a duplicate buffer is created even for a zero-length token. | |
2297 | * | |
2298 | * Returns a pointer to the newly-allocated duplicate, or a null | |
2299 | * pointer if memory for the duplicate was not available. If | |
2300 | * the lenp argument is a non-null pointer, the length of the token | |
2301 | * (not including the '\0') is returned in *lenp. | |
2302 | * | |
2303 | * If successful, the *buf pointer will be updated to point beyond | |
2304 | * the end of the found token. | |
2305 | * | |
2306 | * Note: uses GFP_KERNEL for allocation. | |
2307 | */ | |
2308 | static inline char *dup_token(const char **buf, size_t *lenp) | |
2309 | { | |
2310 | char *dup; | |
2311 | size_t len; | |
2312 | ||
2313 | len = next_token(buf); | |
2314 | dup = kmalloc(len + 1, GFP_KERNEL); | |
2315 | if (!dup) | |
2316 | return NULL; | |
2317 | ||
2318 | memcpy(dup, *buf, len); | |
2319 | *(dup + len) = '\0'; | |
2320 | *buf += len; | |
2321 | ||
2322 | if (lenp) | |
2323 | *lenp = len; | |
2324 | ||
2325 | return dup; | |
2326 | } | |
2327 | ||
a725f65e AE |
2328 | /* |
2329 | * This fills in the pool_name, obj, obj_len, snap_name, obj_len, | |
2330 | * rbd_dev, rbd_md_name, and name fields of the given rbd_dev, based | |
2331 | * on the list of monitor addresses and other options provided via | |
2332 | * /sys/bus/rbd/add. | |
d22f76e7 AE |
2333 | * |
2334 | * Note: rbd_dev is assumed to have been initially zero-filled. | |
a725f65e AE |
2335 | */ |
2336 | static int rbd_add_parse_args(struct rbd_device *rbd_dev, | |
2337 | const char *buf, | |
7ef3214a | 2338 | const char **mon_addrs, |
5214ecc4 | 2339 | size_t *mon_addrs_size, |
e28fff26 AE |
2340 | char *options, |
2341 | size_t options_size) | |
2342 | { | |
d22f76e7 AE |
2343 | size_t len; |
2344 | int ret; | |
e28fff26 AE |
2345 | |
2346 | /* The first four tokens are required */ | |
2347 | ||
7ef3214a AE |
2348 | len = next_token(&buf); |
2349 | if (!len) | |
a725f65e | 2350 | return -EINVAL; |
5214ecc4 | 2351 | *mon_addrs_size = len + 1; |
7ef3214a AE |
2352 | *mon_addrs = buf; |
2353 | ||
2354 | buf += len; | |
a725f65e | 2355 | |
e28fff26 AE |
2356 | len = copy_token(&buf, options, options_size); |
2357 | if (!len || len >= options_size) | |
2358 | return -EINVAL; | |
2359 | ||
d22f76e7 AE |
2360 | rbd_dev->pool_name = dup_token(&buf, NULL); |
2361 | if (!rbd_dev->pool_name) | |
2362 | return -ENOMEM; | |
e28fff26 | 2363 | |
d22f76e7 | 2364 | ret = -EINVAL; |
e28fff26 AE |
2365 | len = copy_token(&buf, rbd_dev->obj, sizeof (rbd_dev->obj)); |
2366 | if (!len || len >= sizeof (rbd_dev->obj)) | |
d22f76e7 | 2367 | goto out_err; |
e28fff26 AE |
2368 | |
2369 | /* We have the object length in hand, save it. */ | |
2370 | ||
2371 | rbd_dev->obj_len = len; | |
a725f65e | 2372 | |
81a89793 AE |
2373 | BUILD_BUG_ON(RBD_MAX_MD_NAME_LEN |
2374 | < RBD_MAX_OBJ_NAME_LEN + sizeof (RBD_SUFFIX)); | |
2375 | sprintf(rbd_dev->obj_md_name, "%s%s", rbd_dev->obj, RBD_SUFFIX); | |
a725f65e | 2376 | |
e28fff26 AE |
2377 | /* |
2378 | * The snapshot name is optional, but it's an error if it's | |
2379 | * too long. If no snapshot is supplied, fill in the default. | |
2380 | */ | |
2381 | len = copy_token(&buf, rbd_dev->snap_name, sizeof (rbd_dev->snap_name)); | |
2382 | if (!len) | |
2383 | memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME, | |
2384 | sizeof (RBD_SNAP_HEAD_NAME)); | |
2385 | else if (len >= sizeof (rbd_dev->snap_name)) | |
d22f76e7 | 2386 | goto out_err; |
e28fff26 | 2387 | |
a725f65e | 2388 | return 0; |
d22f76e7 AE |
2389 | |
2390 | out_err: | |
2391 | kfree(rbd_dev->pool_name); | |
2392 | rbd_dev->pool_name = NULL; | |
2393 | ||
2394 | return ret; | |
a725f65e AE |
2395 | } |
2396 | ||
59c2be1e YS |
2397 | static ssize_t rbd_add(struct bus_type *bus, |
2398 | const char *buf, | |
2399 | size_t count) | |
602adf40 | 2400 | { |
602adf40 | 2401 | struct rbd_device *rbd_dev; |
7ef3214a AE |
2402 | const char *mon_addrs = NULL; |
2403 | size_t mon_addrs_size = 0; | |
27cc2594 AE |
2404 | char *options = NULL; |
2405 | struct ceph_osd_client *osdc; | |
2406 | int rc = -ENOMEM; | |
602adf40 YS |
2407 | |
2408 | if (!try_module_get(THIS_MODULE)) | |
2409 | return -ENODEV; | |
2410 | ||
27cc2594 AE |
2411 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
2412 | if (!rbd_dev) | |
2413 | goto err_nomem; | |
60571c7d | 2414 | options = kmalloc(count, GFP_KERNEL); |
602adf40 | 2415 | if (!options) |
27cc2594 | 2416 | goto err_nomem; |
602adf40 YS |
2417 | |
2418 | /* static rbd_device initialization */ | |
2419 | spin_lock_init(&rbd_dev->lock); | |
2420 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2421 | INIT_LIST_HEAD(&rbd_dev->snaps); |
c666601a | 2422 | init_rwsem(&rbd_dev->header_rwsem); |
602adf40 | 2423 | |
c666601a | 2424 | init_rwsem(&rbd_dev->header_rwsem); |
0e805a1d | 2425 | |
d184f6bf | 2426 | /* generate unique id: find highest unique id, add one */ |
499afd5b | 2427 | rbd_id_get(rbd_dev); |
602adf40 | 2428 | |
a725f65e | 2429 | /* Fill in the device name, now that we have its id. */ |
81a89793 AE |
2430 | BUILD_BUG_ON(DEV_NAME_LEN |
2431 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
2432 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->id); | |
a725f65e | 2433 | |
602adf40 | 2434 | /* parse add command */ |
7ef3214a | 2435 | rc = rbd_add_parse_args(rbd_dev, buf, &mon_addrs, &mon_addrs_size, |
e28fff26 | 2436 | options, count); |
a725f65e | 2437 | if (rc) |
f0f8cef5 | 2438 | goto err_put_id; |
e124a82f | 2439 | |
5214ecc4 AE |
2440 | rbd_dev->rbd_client = rbd_get_client(mon_addrs, mon_addrs_size - 1, |
2441 | options); | |
d720bcb0 AE |
2442 | if (IS_ERR(rbd_dev->rbd_client)) { |
2443 | rc = PTR_ERR(rbd_dev->rbd_client); | |
f0f8cef5 | 2444 | goto err_put_id; |
d720bcb0 | 2445 | } |
602adf40 | 2446 | |
602adf40 | 2447 | /* pick the pool */ |
1dbb4399 | 2448 | osdc = &rbd_dev->rbd_client->client->osdc; |
602adf40 YS |
2449 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); |
2450 | if (rc < 0) | |
2451 | goto err_out_client; | |
9bb2f334 | 2452 | rbd_dev->pool_id = rc; |
602adf40 YS |
2453 | |
2454 | /* register our block device */ | |
27cc2594 AE |
2455 | rc = register_blkdev(0, rbd_dev->name); |
2456 | if (rc < 0) | |
602adf40 | 2457 | goto err_out_client; |
27cc2594 | 2458 | rbd_dev->major = rc; |
602adf40 | 2459 | |
dfc5606d YS |
2460 | rc = rbd_bus_add_dev(rbd_dev); |
2461 | if (rc) | |
766fc439 YS |
2462 | goto err_out_blkdev; |
2463 | ||
32eec68d AE |
2464 | /* |
2465 | * At this point cleanup in the event of an error is the job | |
2466 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
2467 | * | |
2468 | * Set up and announce blkdev mapping. | |
2469 | */ | |
602adf40 YS |
2470 | rc = rbd_init_disk(rbd_dev); |
2471 | if (rc) | |
766fc439 | 2472 | goto err_out_bus; |
602adf40 | 2473 | |
59c2be1e YS |
2474 | rc = rbd_init_watch_dev(rbd_dev); |
2475 | if (rc) | |
2476 | goto err_out_bus; | |
2477 | ||
602adf40 YS |
2478 | return count; |
2479 | ||
766fc439 | 2480 | err_out_bus: |
766fc439 YS |
2481 | /* this will also clean up rest of rbd_dev stuff */ |
2482 | ||
2483 | rbd_bus_del_dev(rbd_dev); | |
2484 | kfree(options); | |
766fc439 YS |
2485 | return rc; |
2486 | ||
602adf40 YS |
2487 | err_out_blkdev: |
2488 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2489 | err_out_client: | |
2490 | rbd_put_client(rbd_dev); | |
f0f8cef5 | 2491 | err_put_id: |
d22f76e7 | 2492 | kfree(rbd_dev->pool_name); |
499afd5b | 2493 | rbd_id_put(rbd_dev); |
27cc2594 | 2494 | err_nomem: |
602adf40 | 2495 | kfree(options); |
27cc2594 AE |
2496 | kfree(rbd_dev); |
2497 | ||
602adf40 YS |
2498 | dout("Error adding device %s\n", buf); |
2499 | module_put(THIS_MODULE); | |
27cc2594 AE |
2500 | |
2501 | return (ssize_t) rc; | |
602adf40 YS |
2502 | } |
2503 | ||
2504 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
2505 | { | |
2506 | struct list_head *tmp; | |
2507 | struct rbd_device *rbd_dev; | |
2508 | ||
e124a82f | 2509 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
2510 | list_for_each(tmp, &rbd_dev_list) { |
2511 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
e124a82f AE |
2512 | if (rbd_dev->id == id) { |
2513 | spin_unlock(&rbd_dev_list_lock); | |
602adf40 | 2514 | return rbd_dev; |
e124a82f | 2515 | } |
602adf40 | 2516 | } |
e124a82f | 2517 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
2518 | return NULL; |
2519 | } | |
2520 | ||
dfc5606d | 2521 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2522 | { |
593a9e7b | 2523 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2524 | |
1dbb4399 AE |
2525 | if (rbd_dev->watch_request) { |
2526 | struct ceph_client *client = rbd_dev->rbd_client->client; | |
2527 | ||
2528 | ceph_osdc_unregister_linger_request(&client->osdc, | |
59c2be1e | 2529 | rbd_dev->watch_request); |
1dbb4399 | 2530 | } |
59c2be1e | 2531 | if (rbd_dev->watch_event) |
79e3057c | 2532 | rbd_req_sync_unwatch(rbd_dev, rbd_dev->obj_md_name); |
59c2be1e | 2533 | |
602adf40 YS |
2534 | rbd_put_client(rbd_dev); |
2535 | ||
2536 | /* clean up and free blkdev */ | |
2537 | rbd_free_disk(rbd_dev); | |
2538 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d AE |
2539 | |
2540 | /* done with the id, and with the rbd_dev */ | |
d22f76e7 | 2541 | kfree(rbd_dev->pool_name); |
32eec68d | 2542 | rbd_id_put(rbd_dev); |
602adf40 YS |
2543 | kfree(rbd_dev); |
2544 | ||
2545 | /* release module ref */ | |
2546 | module_put(THIS_MODULE); | |
602adf40 YS |
2547 | } |
2548 | ||
dfc5606d YS |
2549 | static ssize_t rbd_remove(struct bus_type *bus, |
2550 | const char *buf, | |
2551 | size_t count) | |
602adf40 YS |
2552 | { |
2553 | struct rbd_device *rbd_dev = NULL; | |
2554 | int target_id, rc; | |
2555 | unsigned long ul; | |
2556 | int ret = count; | |
2557 | ||
2558 | rc = strict_strtoul(buf, 10, &ul); | |
2559 | if (rc) | |
2560 | return rc; | |
2561 | ||
2562 | /* convert to int; abort if we lost anything in the conversion */ | |
2563 | target_id = (int) ul; | |
2564 | if (target_id != ul) | |
2565 | return -EINVAL; | |
2566 | ||
2567 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2568 | ||
2569 | rbd_dev = __rbd_get_dev(target_id); | |
2570 | if (!rbd_dev) { | |
2571 | ret = -ENOENT; | |
2572 | goto done; | |
2573 | } | |
2574 | ||
dfc5606d YS |
2575 | __rbd_remove_all_snaps(rbd_dev); |
2576 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2577 | |
2578 | done: | |
2579 | mutex_unlock(&ctl_mutex); | |
2580 | return ret; | |
2581 | } | |
2582 | ||
dfc5606d YS |
2583 | static ssize_t rbd_snap_add(struct device *dev, |
2584 | struct device_attribute *attr, | |
2585 | const char *buf, | |
2586 | size_t count) | |
602adf40 | 2587 | { |
593a9e7b | 2588 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d YS |
2589 | int ret; |
2590 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2591 | if (!name) |
2592 | return -ENOMEM; | |
2593 | ||
dfc5606d | 2594 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2595 | |
2596 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2597 | ||
602adf40 YS |
2598 | ret = rbd_header_add_snap(rbd_dev, |
2599 | name, GFP_KERNEL); | |
2600 | if (ret < 0) | |
59c2be1e | 2601 | goto err_unlock; |
602adf40 | 2602 | |
263c6ca0 | 2603 | ret = __rbd_refresh_header(rbd_dev); |
602adf40 | 2604 | if (ret < 0) |
59c2be1e YS |
2605 | goto err_unlock; |
2606 | ||
2607 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2608 | trigger a watch callback that would need to get that mutex */ | |
2609 | mutex_unlock(&ctl_mutex); | |
2610 | ||
2611 | /* make a best effort, don't error if failed */ | |
2612 | rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name); | |
602adf40 YS |
2613 | |
2614 | ret = count; | |
59c2be1e YS |
2615 | kfree(name); |
2616 | return ret; | |
2617 | ||
2618 | err_unlock: | |
602adf40 | 2619 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2620 | kfree(name); |
2621 | return ret; | |
2622 | } | |
2623 | ||
602adf40 YS |
2624 | /* |
2625 | * create control files in sysfs | |
dfc5606d | 2626 | * /sys/bus/rbd/... |
602adf40 YS |
2627 | */ |
2628 | static int rbd_sysfs_init(void) | |
2629 | { | |
dfc5606d | 2630 | int ret; |
602adf40 | 2631 | |
fed4c143 | 2632 | ret = device_register(&rbd_root_dev); |
21079786 | 2633 | if (ret < 0) |
dfc5606d | 2634 | return ret; |
602adf40 | 2635 | |
fed4c143 AE |
2636 | ret = bus_register(&rbd_bus_type); |
2637 | if (ret < 0) | |
2638 | device_unregister(&rbd_root_dev); | |
602adf40 | 2639 | |
602adf40 YS |
2640 | return ret; |
2641 | } | |
2642 | ||
2643 | static void rbd_sysfs_cleanup(void) | |
2644 | { | |
dfc5606d | 2645 | bus_unregister(&rbd_bus_type); |
fed4c143 | 2646 | device_unregister(&rbd_root_dev); |
602adf40 YS |
2647 | } |
2648 | ||
2649 | int __init rbd_init(void) | |
2650 | { | |
2651 | int rc; | |
2652 | ||
2653 | rc = rbd_sysfs_init(); | |
2654 | if (rc) | |
2655 | return rc; | |
f0f8cef5 | 2656 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
2657 | return 0; |
2658 | } | |
2659 | ||
2660 | void __exit rbd_exit(void) | |
2661 | { | |
2662 | rbd_sysfs_cleanup(); | |
2663 | } | |
2664 | ||
2665 | module_init(rbd_init); | |
2666 | module_exit(rbd_exit); | |
2667 | ||
2668 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2669 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2670 | MODULE_DESCRIPTION("rados block device"); | |
2671 | ||
2672 | /* following authorship retained from original osdblk.c */ | |
2673 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2674 | ||
2675 | MODULE_LICENSE("GPL"); |