Root/
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 | |
24 | For usage instructions, please refer to: |
25 | |
26 | Documentation/ABI/testing/sysfs-bus-rbd |
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> |
34 | #include <linux/parser.h> |
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 | |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | |
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 | |
55 | /* It might be useful to have these defined elsewhere */ |
56 | |
57 | #define U8_MAX ((u8) (~0U)) |
58 | #define U16_MAX ((u16) (~0U)) |
59 | #define U32_MAX ((u32) (~0U)) |
60 | #define U64_MAX ((u64) (~0ULL)) |
61 | |
62 | #define RBD_DRV_NAME "rbd" |
63 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" |
64 | |
65 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ |
66 | |
67 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
68 | #define RBD_MAX_SNAP_NAME_LEN \ |
69 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) |
70 | |
71 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
72 | |
73 | #define RBD_SNAP_HEAD_NAME "-" |
74 | |
75 | /* This allows a single page to hold an image name sent by OSD */ |
76 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) |
77 | #define RBD_IMAGE_ID_LEN_MAX 64 |
78 | |
79 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
80 | |
81 | /* Feature bits */ |
82 | |
83 | #define RBD_FEATURE_LAYERING 1 |
84 | |
85 | /* Features supported by this (client software) implementation. */ |
86 | |
87 | #define RBD_FEATURES_ALL (0) |
88 | |
89 | /* |
90 | * An RBD device name will be "rbd#", where the "rbd" comes from |
91 | * RBD_DRV_NAME above, and # is a unique integer identifier. |
92 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big |
93 | * enough to hold all possible device names. |
94 | */ |
95 | #define DEV_NAME_LEN 32 |
96 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
97 | |
98 | /* |
99 | * block device image metadata (in-memory version) |
100 | */ |
101 | struct rbd_image_header { |
102 | /* These four fields never change for a given rbd image */ |
103 | char *object_prefix; |
104 | u64 features; |
105 | __u8 obj_order; |
106 | __u8 crypt_type; |
107 | __u8 comp_type; |
108 | |
109 | /* The remaining fields need to be updated occasionally */ |
110 | u64 image_size; |
111 | struct ceph_snap_context *snapc; |
112 | char *snap_names; |
113 | u64 *snap_sizes; |
114 | |
115 | u64 obj_version; |
116 | }; |
117 | |
118 | /* |
119 | * An rbd image specification. |
120 | * |
121 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely |
122 | * identify an image. Each rbd_dev structure includes a pointer to |
123 | * an rbd_spec structure that encapsulates this identity. |
124 | * |
125 | * Each of the id's in an rbd_spec has an associated name. For a |
126 | * user-mapped image, the names are supplied and the id's associated |
127 | * with them are looked up. For a layered image, a parent image is |
128 | * defined by the tuple, and the names are looked up. |
129 | * |
130 | * An rbd_dev structure contains a parent_spec pointer which is |
131 | * non-null if the image it represents is a child in a layered |
132 | * image. This pointer will refer to the rbd_spec structure used |
133 | * by the parent rbd_dev for its own identity (i.e., the structure |
134 | * is shared between the parent and child). |
135 | * |
136 | * Since these structures are populated once, during the discovery |
137 | * phase of image construction, they are effectively immutable so |
138 | * we make no effort to synchronize access to them. |
139 | * |
140 | * Note that code herein does not assume the image name is known (it |
141 | * could be a null pointer). |
142 | */ |
143 | struct rbd_spec { |
144 | u64 pool_id; |
145 | char *pool_name; |
146 | |
147 | char *image_id; |
148 | char *image_name; |
149 | |
150 | u64 snap_id; |
151 | char *snap_name; |
152 | |
153 | struct kref kref; |
154 | }; |
155 | |
156 | /* |
157 | * an instance of the client. multiple devices may share an rbd client. |
158 | */ |
159 | struct rbd_client { |
160 | struct ceph_client *client; |
161 | struct kref kref; |
162 | struct list_head node; |
163 | }; |
164 | |
165 | struct rbd_img_request; |
166 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); |
167 | |
168 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ |
169 | |
170 | struct rbd_obj_request; |
171 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); |
172 | |
173 | enum obj_request_type { |
174 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES |
175 | }; |
176 | |
177 | struct rbd_obj_request { |
178 | const char *object_name; |
179 | u64 offset; /* object start byte */ |
180 | u64 length; /* bytes from offset */ |
181 | |
182 | struct rbd_img_request *img_request; |
183 | struct list_head links; /* img_request->obj_requests */ |
184 | u32 which; /* posn image request list */ |
185 | |
186 | enum obj_request_type type; |
187 | union { |
188 | struct bio *bio_list; |
189 | struct { |
190 | struct page **pages; |
191 | u32 page_count; |
192 | }; |
193 | }; |
194 | |
195 | struct ceph_osd_request *osd_req; |
196 | |
197 | u64 xferred; /* bytes transferred */ |
198 | u64 version; |
199 | int result; |
200 | atomic_t done; |
201 | |
202 | rbd_obj_callback_t callback; |
203 | struct completion completion; |
204 | |
205 | struct kref kref; |
206 | }; |
207 | |
208 | struct rbd_img_request { |
209 | struct request *rq; |
210 | struct rbd_device *rbd_dev; |
211 | u64 offset; /* starting image byte offset */ |
212 | u64 length; /* byte count from offset */ |
213 | bool write_request; /* false for read */ |
214 | union { |
215 | struct ceph_snap_context *snapc; /* for writes */ |
216 | u64 snap_id; /* for reads */ |
217 | }; |
218 | spinlock_t completion_lock;/* protects next_completion */ |
219 | u32 next_completion; |
220 | rbd_img_callback_t callback; |
221 | |
222 | u32 obj_request_count; |
223 | struct list_head obj_requests; /* rbd_obj_request structs */ |
224 | |
225 | struct kref kref; |
226 | }; |
227 | |
228 | #define for_each_obj_request(ireq, oreq) \ |
229 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
230 | #define for_each_obj_request_from(ireq, oreq) \ |
231 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
232 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
233 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
234 | |
235 | struct rbd_snap { |
236 | struct device dev; |
237 | const char *name; |
238 | u64 size; |
239 | struct list_head node; |
240 | u64 id; |
241 | u64 features; |
242 | }; |
243 | |
244 | struct rbd_mapping { |
245 | u64 size; |
246 | u64 features; |
247 | bool read_only; |
248 | }; |
249 | |
250 | /* |
251 | * a single device |
252 | */ |
253 | struct rbd_device { |
254 | int dev_id; /* blkdev unique id */ |
255 | |
256 | int major; /* blkdev assigned major */ |
257 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
258 | |
259 | u32 image_format; /* Either 1 or 2 */ |
260 | struct rbd_client *rbd_client; |
261 | |
262 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
263 | |
264 | spinlock_t lock; /* queue, flags, open_count */ |
265 | |
266 | struct rbd_image_header header; |
267 | unsigned long flags; /* possibly lock protected */ |
268 | struct rbd_spec *spec; |
269 | |
270 | char *header_name; |
271 | |
272 | struct ceph_file_layout layout; |
273 | |
274 | struct ceph_osd_event *watch_event; |
275 | struct rbd_obj_request *watch_request; |
276 | |
277 | struct rbd_spec *parent_spec; |
278 | u64 parent_overlap; |
279 | |
280 | /* protects updating the header */ |
281 | struct rw_semaphore header_rwsem; |
282 | |
283 | struct rbd_mapping mapping; |
284 | |
285 | struct list_head node; |
286 | |
287 | /* list of snapshots */ |
288 | struct list_head snaps; |
289 | |
290 | /* sysfs related */ |
291 | struct device dev; |
292 | unsigned long open_count; /* protected by lock */ |
293 | }; |
294 | |
295 | /* |
296 | * Flag bits for rbd_dev->flags. If atomicity is required, |
297 | * rbd_dev->lock is used to protect access. |
298 | * |
299 | * Currently, only the "removing" flag (which is coupled with the |
300 | * "open_count" field) requires atomic access. |
301 | */ |
302 | enum rbd_dev_flags { |
303 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ |
304 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
305 | }; |
306 | |
307 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
308 | |
309 | static LIST_HEAD(rbd_dev_list); /* devices */ |
310 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
311 | |
312 | static LIST_HEAD(rbd_client_list); /* clients */ |
313 | static DEFINE_SPINLOCK(rbd_client_list_lock); |
314 | |
315 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
316 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); |
317 | |
318 | static void rbd_dev_release(struct device *dev); |
319 | static void rbd_remove_snap_dev(struct rbd_snap *snap); |
320 | |
321 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
322 | size_t count); |
323 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, |
324 | size_t count); |
325 | |
326 | static struct bus_attribute rbd_bus_attrs[] = { |
327 | __ATTR(add, S_IWUSR, NULL, rbd_add), |
328 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), |
329 | __ATTR_NULL |
330 | }; |
331 | |
332 | static struct bus_type rbd_bus_type = { |
333 | .name = "rbd", |
334 | .bus_attrs = rbd_bus_attrs, |
335 | }; |
336 | |
337 | static void rbd_root_dev_release(struct device *dev) |
338 | { |
339 | } |
340 | |
341 | static struct device rbd_root_dev = { |
342 | .init_name = "rbd", |
343 | .release = rbd_root_dev_release, |
344 | }; |
345 | |
346 | static __printf(2, 3) |
347 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) |
348 | { |
349 | struct va_format vaf; |
350 | va_list args; |
351 | |
352 | va_start(args, fmt); |
353 | vaf.fmt = fmt; |
354 | vaf.va = &args; |
355 | |
356 | if (!rbd_dev) |
357 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); |
358 | else if (rbd_dev->disk) |
359 | printk(KERN_WARNING "%s: %s: %pV\n", |
360 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); |
361 | else if (rbd_dev->spec && rbd_dev->spec->image_name) |
362 | printk(KERN_WARNING "%s: image %s: %pV\n", |
363 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); |
364 | else if (rbd_dev->spec && rbd_dev->spec->image_id) |
365 | printk(KERN_WARNING "%s: id %s: %pV\n", |
366 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); |
367 | else /* punt */ |
368 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", |
369 | RBD_DRV_NAME, rbd_dev, &vaf); |
370 | va_end(args); |
371 | } |
372 | |
373 | #ifdef RBD_DEBUG |
374 | #define rbd_assert(expr) \ |
375 | if (unlikely(!(expr))) { \ |
376 | printk(KERN_ERR "\nAssertion failure in %s() " \ |
377 | "at line %d:\n\n" \ |
378 | "\trbd_assert(%s);\n\n", \ |
379 | __func__, __LINE__, #expr); \ |
380 | BUG(); \ |
381 | } |
382 | #else /* !RBD_DEBUG */ |
383 | # define rbd_assert(expr) ((void) 0) |
384 | #endif /* !RBD_DEBUG */ |
385 | |
386 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
387 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); |
388 | |
389 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
390 | { |
391 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
392 | bool removing = false; |
393 | |
394 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
395 | return -EROFS; |
396 | |
397 | spin_lock_irq(&rbd_dev->lock); |
398 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
399 | removing = true; |
400 | else |
401 | rbd_dev->open_count++; |
402 | spin_unlock_irq(&rbd_dev->lock); |
403 | if (removing) |
404 | return -ENOENT; |
405 | |
406 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
407 | (void) get_device(&rbd_dev->dev); |
408 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
409 | mutex_unlock(&ctl_mutex); |
410 | |
411 | return 0; |
412 | } |
413 | |
414 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
415 | { |
416 | struct rbd_device *rbd_dev = disk->private_data; |
417 | unsigned long open_count_before; |
418 | |
419 | spin_lock_irq(&rbd_dev->lock); |
420 | open_count_before = rbd_dev->open_count--; |
421 | spin_unlock_irq(&rbd_dev->lock); |
422 | rbd_assert(open_count_before > 0); |
423 | |
424 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
425 | put_device(&rbd_dev->dev); |
426 | mutex_unlock(&ctl_mutex); |
427 | |
428 | return 0; |
429 | } |
430 | |
431 | static const struct block_device_operations rbd_bd_ops = { |
432 | .owner = THIS_MODULE, |
433 | .open = rbd_open, |
434 | .release = rbd_release, |
435 | }; |
436 | |
437 | /* |
438 | * Initialize an rbd client instance. |
439 | * We own *ceph_opts. |
440 | */ |
441 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
442 | { |
443 | struct rbd_client *rbdc; |
444 | int ret = -ENOMEM; |
445 | |
446 | dout("%s:\n", __func__); |
447 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
448 | if (!rbdc) |
449 | goto out_opt; |
450 | |
451 | kref_init(&rbdc->kref); |
452 | INIT_LIST_HEAD(&rbdc->node); |
453 | |
454 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
455 | |
456 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
457 | if (IS_ERR(rbdc->client)) |
458 | goto out_mutex; |
459 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
460 | |
461 | ret = ceph_open_session(rbdc->client); |
462 | if (ret < 0) |
463 | goto out_err; |
464 | |
465 | spin_lock(&rbd_client_list_lock); |
466 | list_add_tail(&rbdc->node, &rbd_client_list); |
467 | spin_unlock(&rbd_client_list_lock); |
468 | |
469 | mutex_unlock(&ctl_mutex); |
470 | dout("%s: rbdc %p\n", __func__, rbdc); |
471 | |
472 | return rbdc; |
473 | |
474 | out_err: |
475 | ceph_destroy_client(rbdc->client); |
476 | out_mutex: |
477 | mutex_unlock(&ctl_mutex); |
478 | kfree(rbdc); |
479 | out_opt: |
480 | if (ceph_opts) |
481 | ceph_destroy_options(ceph_opts); |
482 | dout("%s: error %d\n", __func__, ret); |
483 | |
484 | return ERR_PTR(ret); |
485 | } |
486 | |
487 | /* |
488 | * Find a ceph client with specific addr and configuration. If |
489 | * found, bump its reference count. |
490 | */ |
491 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
492 | { |
493 | struct rbd_client *client_node; |
494 | bool found = false; |
495 | |
496 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
497 | return NULL; |
498 | |
499 | spin_lock(&rbd_client_list_lock); |
500 | list_for_each_entry(client_node, &rbd_client_list, node) { |
501 | if (!ceph_compare_options(ceph_opts, client_node->client)) { |
502 | kref_get(&client_node->kref); |
503 | found = true; |
504 | break; |
505 | } |
506 | } |
507 | spin_unlock(&rbd_client_list_lock); |
508 | |
509 | return found ? client_node : NULL; |
510 | } |
511 | |
512 | /* |
513 | * mount options |
514 | */ |
515 | enum { |
516 | Opt_last_int, |
517 | /* int args above */ |
518 | Opt_last_string, |
519 | /* string args above */ |
520 | Opt_read_only, |
521 | Opt_read_write, |
522 | /* Boolean args above */ |
523 | Opt_last_bool, |
524 | }; |
525 | |
526 | static match_table_t rbd_opts_tokens = { |
527 | /* int args above */ |
528 | /* string args above */ |
529 | {Opt_read_only, "read_only"}, |
530 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
531 | {Opt_read_write, "read_write"}, |
532 | {Opt_read_write, "rw"}, /* Alternate spelling */ |
533 | /* Boolean args above */ |
534 | {-1, NULL} |
535 | }; |
536 | |
537 | struct rbd_options { |
538 | bool read_only; |
539 | }; |
540 | |
541 | #define RBD_READ_ONLY_DEFAULT false |
542 | |
543 | static int parse_rbd_opts_token(char *c, void *private) |
544 | { |
545 | struct rbd_options *rbd_opts = private; |
546 | substring_t argstr[MAX_OPT_ARGS]; |
547 | int token, intval, ret; |
548 | |
549 | token = match_token(c, rbd_opts_tokens, argstr); |
550 | if (token < 0) |
551 | return -EINVAL; |
552 | |
553 | if (token < Opt_last_int) { |
554 | ret = match_int(&argstr[0], &intval); |
555 | if (ret < 0) { |
556 | pr_err("bad mount option arg (not int) " |
557 | "at '%s'\n", c); |
558 | return ret; |
559 | } |
560 | dout("got int token %d val %d\n", token, intval); |
561 | } else if (token > Opt_last_int && token < Opt_last_string) { |
562 | dout("got string token %d val %s\n", token, |
563 | argstr[0].from); |
564 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
565 | dout("got Boolean token %d\n", token); |
566 | } else { |
567 | dout("got token %d\n", token); |
568 | } |
569 | |
570 | switch (token) { |
571 | case Opt_read_only: |
572 | rbd_opts->read_only = true; |
573 | break; |
574 | case Opt_read_write: |
575 | rbd_opts->read_only = false; |
576 | break; |
577 | default: |
578 | rbd_assert(false); |
579 | break; |
580 | } |
581 | return 0; |
582 | } |
583 | |
584 | /* |
585 | * Get a ceph client with specific addr and configuration, if one does |
586 | * not exist create it. |
587 | */ |
588 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
589 | { |
590 | struct rbd_client *rbdc; |
591 | |
592 | rbdc = rbd_client_find(ceph_opts); |
593 | if (rbdc) /* using an existing client */ |
594 | ceph_destroy_options(ceph_opts); |
595 | else |
596 | rbdc = rbd_client_create(ceph_opts); |
597 | |
598 | return rbdc; |
599 | } |
600 | |
601 | /* |
602 | * Destroy ceph client |
603 | * |
604 | * Caller must hold rbd_client_list_lock. |
605 | */ |
606 | static void rbd_client_release(struct kref *kref) |
607 | { |
608 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
609 | |
610 | dout("%s: rbdc %p\n", __func__, rbdc); |
611 | spin_lock(&rbd_client_list_lock); |
612 | list_del(&rbdc->node); |
613 | spin_unlock(&rbd_client_list_lock); |
614 | |
615 | ceph_destroy_client(rbdc->client); |
616 | kfree(rbdc); |
617 | } |
618 | |
619 | /* |
620 | * Drop reference to ceph client node. If it's not referenced anymore, release |
621 | * it. |
622 | */ |
623 | static void rbd_put_client(struct rbd_client *rbdc) |
624 | { |
625 | if (rbdc) |
626 | kref_put(&rbdc->kref, rbd_client_release); |
627 | } |
628 | |
629 | static bool rbd_image_format_valid(u32 image_format) |
630 | { |
631 | return image_format == 1 || image_format == 2; |
632 | } |
633 | |
634 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
635 | { |
636 | size_t size; |
637 | u32 snap_count; |
638 | |
639 | /* The header has to start with the magic rbd header text */ |
640 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) |
641 | return false; |
642 | |
643 | /* The bio layer requires at least sector-sized I/O */ |
644 | |
645 | if (ondisk->options.order < SECTOR_SHIFT) |
646 | return false; |
647 | |
648 | /* If we use u64 in a few spots we may be able to loosen this */ |
649 | |
650 | if (ondisk->options.order > 8 * sizeof (int) - 1) |
651 | return false; |
652 | |
653 | /* |
654 | * The size of a snapshot header has to fit in a size_t, and |
655 | * that limits the number of snapshots. |
656 | */ |
657 | snap_count = le32_to_cpu(ondisk->snap_count); |
658 | size = SIZE_MAX - sizeof (struct ceph_snap_context); |
659 | if (snap_count > size / sizeof (__le64)) |
660 | return false; |
661 | |
662 | /* |
663 | * Not only that, but the size of the entire the snapshot |
664 | * header must also be representable in a size_t. |
665 | */ |
666 | size -= snap_count * sizeof (__le64); |
667 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) |
668 | return false; |
669 | |
670 | return true; |
671 | } |
672 | |
673 | /* |
674 | * Create a new header structure, translate header format from the on-disk |
675 | * header. |
676 | */ |
677 | static int rbd_header_from_disk(struct rbd_image_header *header, |
678 | struct rbd_image_header_ondisk *ondisk) |
679 | { |
680 | u32 snap_count; |
681 | size_t len; |
682 | size_t size; |
683 | u32 i; |
684 | |
685 | memset(header, 0, sizeof (*header)); |
686 | |
687 | snap_count = le32_to_cpu(ondisk->snap_count); |
688 | |
689 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
690 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); |
691 | if (!header->object_prefix) |
692 | return -ENOMEM; |
693 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
694 | header->object_prefix[len] = '\0'; |
695 | |
696 | if (snap_count) { |
697 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
698 | |
699 | /* Save a copy of the snapshot names */ |
700 | |
701 | if (snap_names_len > (u64) SIZE_MAX) |
702 | return -EIO; |
703 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
704 | if (!header->snap_names) |
705 | goto out_err; |
706 | /* |
707 | * Note that rbd_dev_v1_header_read() guarantees |
708 | * the ondisk buffer we're working with has |
709 | * snap_names_len bytes beyond the end of the |
710 | * snapshot id array, this memcpy() is safe. |
711 | */ |
712 | memcpy(header->snap_names, &ondisk->snaps[snap_count], |
713 | snap_names_len); |
714 | |
715 | /* Record each snapshot's size */ |
716 | |
717 | size = snap_count * sizeof (*header->snap_sizes); |
718 | header->snap_sizes = kmalloc(size, GFP_KERNEL); |
719 | if (!header->snap_sizes) |
720 | goto out_err; |
721 | for (i = 0; i < snap_count; i++) |
722 | header->snap_sizes[i] = |
723 | le64_to_cpu(ondisk->snaps[i].image_size); |
724 | } else { |
725 | WARN_ON(ondisk->snap_names_len); |
726 | header->snap_names = NULL; |
727 | header->snap_sizes = NULL; |
728 | } |
729 | |
730 | header->features = 0; /* No features support in v1 images */ |
731 | header->obj_order = ondisk->options.order; |
732 | header->crypt_type = ondisk->options.crypt_type; |
733 | header->comp_type = ondisk->options.comp_type; |
734 | |
735 | /* Allocate and fill in the snapshot context */ |
736 | |
737 | header->image_size = le64_to_cpu(ondisk->image_size); |
738 | size = sizeof (struct ceph_snap_context); |
739 | size += snap_count * sizeof (header->snapc->snaps[0]); |
740 | header->snapc = kzalloc(size, GFP_KERNEL); |
741 | if (!header->snapc) |
742 | goto out_err; |
743 | |
744 | atomic_set(&header->snapc->nref, 1); |
745 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
746 | header->snapc->num_snaps = snap_count; |
747 | for (i = 0; i < snap_count; i++) |
748 | header->snapc->snaps[i] = |
749 | le64_to_cpu(ondisk->snaps[i].id); |
750 | |
751 | return 0; |
752 | |
753 | out_err: |
754 | kfree(header->snap_sizes); |
755 | header->snap_sizes = NULL; |
756 | kfree(header->snap_names); |
757 | header->snap_names = NULL; |
758 | kfree(header->object_prefix); |
759 | header->object_prefix = NULL; |
760 | |
761 | return -ENOMEM; |
762 | } |
763 | |
764 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
765 | { |
766 | struct rbd_snap *snap; |
767 | |
768 | if (snap_id == CEPH_NOSNAP) |
769 | return RBD_SNAP_HEAD_NAME; |
770 | |
771 | list_for_each_entry(snap, &rbd_dev->snaps, node) |
772 | if (snap_id == snap->id) |
773 | return snap->name; |
774 | |
775 | return NULL; |
776 | } |
777 | |
778 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
779 | { |
780 | |
781 | struct rbd_snap *snap; |
782 | |
783 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
784 | if (!strcmp(snap_name, snap->name)) { |
785 | rbd_dev->spec->snap_id = snap->id; |
786 | rbd_dev->mapping.size = snap->size; |
787 | rbd_dev->mapping.features = snap->features; |
788 | |
789 | return 0; |
790 | } |
791 | } |
792 | |
793 | return -ENOENT; |
794 | } |
795 | |
796 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) |
797 | { |
798 | int ret; |
799 | |
800 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
801 | sizeof (RBD_SNAP_HEAD_NAME))) { |
802 | rbd_dev->spec->snap_id = CEPH_NOSNAP; |
803 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
804 | rbd_dev->mapping.features = rbd_dev->header.features; |
805 | ret = 0; |
806 | } else { |
807 | ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); |
808 | if (ret < 0) |
809 | goto done; |
810 | rbd_dev->mapping.read_only = true; |
811 | } |
812 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
813 | |
814 | done: |
815 | return ret; |
816 | } |
817 | |
818 | static void rbd_header_free(struct rbd_image_header *header) |
819 | { |
820 | kfree(header->object_prefix); |
821 | header->object_prefix = NULL; |
822 | kfree(header->snap_sizes); |
823 | header->snap_sizes = NULL; |
824 | kfree(header->snap_names); |
825 | header->snap_names = NULL; |
826 | ceph_put_snap_context(header->snapc); |
827 | header->snapc = NULL; |
828 | } |
829 | |
830 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
831 | { |
832 | char *name; |
833 | u64 segment; |
834 | int ret; |
835 | |
836 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
837 | if (!name) |
838 | return NULL; |
839 | segment = offset >> rbd_dev->header.obj_order; |
840 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
841 | rbd_dev->header.object_prefix, segment); |
842 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
843 | pr_err("error formatting segment name for #%llu (%d)\n", |
844 | segment, ret); |
845 | kfree(name); |
846 | name = NULL; |
847 | } |
848 | |
849 | return name; |
850 | } |
851 | |
852 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
853 | { |
854 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
855 | |
856 | return offset & (segment_size - 1); |
857 | } |
858 | |
859 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, |
860 | u64 offset, u64 length) |
861 | { |
862 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
863 | |
864 | offset &= segment_size - 1; |
865 | |
866 | rbd_assert(length <= U64_MAX - offset); |
867 | if (offset + length > segment_size) |
868 | length = segment_size - offset; |
869 | |
870 | return length; |
871 | } |
872 | |
873 | /* |
874 | * returns the size of an object in the image |
875 | */ |
876 | static u64 rbd_obj_bytes(struct rbd_image_header *header) |
877 | { |
878 | return 1 << header->obj_order; |
879 | } |
880 | |
881 | /* |
882 | * bio helpers |
883 | */ |
884 | |
885 | static void bio_chain_put(struct bio *chain) |
886 | { |
887 | struct bio *tmp; |
888 | |
889 | while (chain) { |
890 | tmp = chain; |
891 | chain = chain->bi_next; |
892 | bio_put(tmp); |
893 | } |
894 | } |
895 | |
896 | /* |
897 | * zeros a bio chain, starting at specific offset |
898 | */ |
899 | static void zero_bio_chain(struct bio *chain, int start_ofs) |
900 | { |
901 | struct bio_vec *bv; |
902 | unsigned long flags; |
903 | void *buf; |
904 | int i; |
905 | int pos = 0; |
906 | |
907 | while (chain) { |
908 | bio_for_each_segment(bv, chain, i) { |
909 | if (pos + bv->bv_len > start_ofs) { |
910 | int remainder = max(start_ofs - pos, 0); |
911 | buf = bvec_kmap_irq(bv, &flags); |
912 | memset(buf + remainder, 0, |
913 | bv->bv_len - remainder); |
914 | bvec_kunmap_irq(buf, &flags); |
915 | } |
916 | pos += bv->bv_len; |
917 | } |
918 | |
919 | chain = chain->bi_next; |
920 | } |
921 | } |
922 | |
923 | /* |
924 | * Clone a portion of a bio, starting at the given byte offset |
925 | * and continuing for the number of bytes indicated. |
926 | */ |
927 | static struct bio *bio_clone_range(struct bio *bio_src, |
928 | unsigned int offset, |
929 | unsigned int len, |
930 | gfp_t gfpmask) |
931 | { |
932 | struct bio_vec *bv; |
933 | unsigned int resid; |
934 | unsigned short idx; |
935 | unsigned int voff; |
936 | unsigned short end_idx; |
937 | unsigned short vcnt; |
938 | struct bio *bio; |
939 | |
940 | /* Handle the easy case for the caller */ |
941 | |
942 | if (!offset && len == bio_src->bi_size) |
943 | return bio_clone(bio_src, gfpmask); |
944 | |
945 | if (WARN_ON_ONCE(!len)) |
946 | return NULL; |
947 | if (WARN_ON_ONCE(len > bio_src->bi_size)) |
948 | return NULL; |
949 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) |
950 | return NULL; |
951 | |
952 | /* Find first affected segment... */ |
953 | |
954 | resid = offset; |
955 | __bio_for_each_segment(bv, bio_src, idx, 0) { |
956 | if (resid < bv->bv_len) |
957 | break; |
958 | resid -= bv->bv_len; |
959 | } |
960 | voff = resid; |
961 | |
962 | /* ...and the last affected segment */ |
963 | |
964 | resid += len; |
965 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { |
966 | if (resid <= bv->bv_len) |
967 | break; |
968 | resid -= bv->bv_len; |
969 | } |
970 | vcnt = end_idx - idx + 1; |
971 | |
972 | /* Build the clone */ |
973 | |
974 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); |
975 | if (!bio) |
976 | return NULL; /* ENOMEM */ |
977 | |
978 | bio->bi_bdev = bio_src->bi_bdev; |
979 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); |
980 | bio->bi_rw = bio_src->bi_rw; |
981 | bio->bi_flags |= 1 << BIO_CLONED; |
982 | |
983 | /* |
984 | * Copy over our part of the bio_vec, then update the first |
985 | * and last (or only) entries. |
986 | */ |
987 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], |
988 | vcnt * sizeof (struct bio_vec)); |
989 | bio->bi_io_vec[0].bv_offset += voff; |
990 | if (vcnt > 1) { |
991 | bio->bi_io_vec[0].bv_len -= voff; |
992 | bio->bi_io_vec[vcnt - 1].bv_len = resid; |
993 | } else { |
994 | bio->bi_io_vec[0].bv_len = len; |
995 | } |
996 | |
997 | bio->bi_vcnt = vcnt; |
998 | bio->bi_size = len; |
999 | bio->bi_idx = 0; |
1000 | |
1001 | return bio; |
1002 | } |
1003 | |
1004 | /* |
1005 | * Clone a portion of a bio chain, starting at the given byte offset |
1006 | * into the first bio in the source chain and continuing for the |
1007 | * number of bytes indicated. The result is another bio chain of |
1008 | * exactly the given length, or a null pointer on error. |
1009 | * |
1010 | * The bio_src and offset parameters are both in-out. On entry they |
1011 | * refer to the first source bio and the offset into that bio where |
1012 | * the start of data to be cloned is located. |
1013 | * |
1014 | * On return, bio_src is updated to refer to the bio in the source |
1015 | * chain that contains first un-cloned byte, and *offset will |
1016 | * contain the offset of that byte within that bio. |
1017 | */ |
1018 | static struct bio *bio_chain_clone_range(struct bio **bio_src, |
1019 | unsigned int *offset, |
1020 | unsigned int len, |
1021 | gfp_t gfpmask) |
1022 | { |
1023 | struct bio *bi = *bio_src; |
1024 | unsigned int off = *offset; |
1025 | struct bio *chain = NULL; |
1026 | struct bio **end; |
1027 | |
1028 | /* Build up a chain of clone bios up to the limit */ |
1029 | |
1030 | if (!bi || off >= bi->bi_size || !len) |
1031 | return NULL; /* Nothing to clone */ |
1032 | |
1033 | end = &chain; |
1034 | while (len) { |
1035 | unsigned int bi_size; |
1036 | struct bio *bio; |
1037 | |
1038 | if (!bi) { |
1039 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); |
1040 | goto out_err; /* EINVAL; ran out of bio's */ |
1041 | } |
1042 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1043 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1044 | if (!bio) |
1045 | goto out_err; /* ENOMEM */ |
1046 | |
1047 | *end = bio; |
1048 | end = &bio->bi_next; |
1049 | |
1050 | off += bi_size; |
1051 | if (off == bi->bi_size) { |
1052 | bi = bi->bi_next; |
1053 | off = 0; |
1054 | } |
1055 | len -= bi_size; |
1056 | } |
1057 | *bio_src = bi; |
1058 | *offset = off; |
1059 | |
1060 | return chain; |
1061 | out_err: |
1062 | bio_chain_put(chain); |
1063 | |
1064 | return NULL; |
1065 | } |
1066 | |
1067 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1068 | { |
1069 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1070 | atomic_read(&obj_request->kref.refcount)); |
1071 | kref_get(&obj_request->kref); |
1072 | } |
1073 | |
1074 | static void rbd_obj_request_destroy(struct kref *kref); |
1075 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) |
1076 | { |
1077 | rbd_assert(obj_request != NULL); |
1078 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1079 | atomic_read(&obj_request->kref.refcount)); |
1080 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1081 | } |
1082 | |
1083 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1084 | { |
1085 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1086 | atomic_read(&img_request->kref.refcount)); |
1087 | kref_get(&img_request->kref); |
1088 | } |
1089 | |
1090 | static void rbd_img_request_destroy(struct kref *kref); |
1091 | static void rbd_img_request_put(struct rbd_img_request *img_request) |
1092 | { |
1093 | rbd_assert(img_request != NULL); |
1094 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1095 | atomic_read(&img_request->kref.refcount)); |
1096 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1097 | } |
1098 | |
1099 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
1100 | struct rbd_obj_request *obj_request) |
1101 | { |
1102 | rbd_assert(obj_request->img_request == NULL); |
1103 | |
1104 | rbd_obj_request_get(obj_request); |
1105 | obj_request->img_request = img_request; |
1106 | obj_request->which = img_request->obj_request_count; |
1107 | rbd_assert(obj_request->which != BAD_WHICH); |
1108 | img_request->obj_request_count++; |
1109 | list_add_tail(&obj_request->links, &img_request->obj_requests); |
1110 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1111 | obj_request->which); |
1112 | } |
1113 | |
1114 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, |
1115 | struct rbd_obj_request *obj_request) |
1116 | { |
1117 | rbd_assert(obj_request->which != BAD_WHICH); |
1118 | |
1119 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1120 | obj_request->which); |
1121 | list_del(&obj_request->links); |
1122 | rbd_assert(img_request->obj_request_count > 0); |
1123 | img_request->obj_request_count--; |
1124 | rbd_assert(obj_request->which == img_request->obj_request_count); |
1125 | obj_request->which = BAD_WHICH; |
1126 | rbd_assert(obj_request->img_request == img_request); |
1127 | obj_request->img_request = NULL; |
1128 | obj_request->callback = NULL; |
1129 | rbd_obj_request_put(obj_request); |
1130 | } |
1131 | |
1132 | static bool obj_request_type_valid(enum obj_request_type type) |
1133 | { |
1134 | switch (type) { |
1135 | case OBJ_REQUEST_NODATA: |
1136 | case OBJ_REQUEST_BIO: |
1137 | case OBJ_REQUEST_PAGES: |
1138 | return true; |
1139 | default: |
1140 | return false; |
1141 | } |
1142 | } |
1143 | |
1144 | static struct ceph_osd_req_op *rbd_osd_req_op_create(u16 opcode, ...) |
1145 | { |
1146 | struct ceph_osd_req_op *op; |
1147 | va_list args; |
1148 | size_t size; |
1149 | |
1150 | op = kzalloc(sizeof (*op), GFP_NOIO); |
1151 | if (!op) |
1152 | return NULL; |
1153 | op->op = opcode; |
1154 | va_start(args, opcode); |
1155 | switch (opcode) { |
1156 | case CEPH_OSD_OP_READ: |
1157 | case CEPH_OSD_OP_WRITE: |
1158 | /* rbd_osd_req_op_create(READ, offset, length) */ |
1159 | /* rbd_osd_req_op_create(WRITE, offset, length) */ |
1160 | op->extent.offset = va_arg(args, u64); |
1161 | op->extent.length = va_arg(args, u64); |
1162 | if (opcode == CEPH_OSD_OP_WRITE) |
1163 | op->payload_len = op->extent.length; |
1164 | break; |
1165 | case CEPH_OSD_OP_STAT: |
1166 | break; |
1167 | case CEPH_OSD_OP_CALL: |
1168 | /* rbd_osd_req_op_create(CALL, class, method, data, datalen) */ |
1169 | op->cls.class_name = va_arg(args, char *); |
1170 | size = strlen(op->cls.class_name); |
1171 | rbd_assert(size <= (size_t) U8_MAX); |
1172 | op->cls.class_len = size; |
1173 | op->payload_len = size; |
1174 | |
1175 | op->cls.method_name = va_arg(args, char *); |
1176 | size = strlen(op->cls.method_name); |
1177 | rbd_assert(size <= (size_t) U8_MAX); |
1178 | op->cls.method_len = size; |
1179 | op->payload_len += size; |
1180 | |
1181 | op->cls.argc = 0; |
1182 | op->cls.indata = va_arg(args, void *); |
1183 | size = va_arg(args, size_t); |
1184 | rbd_assert(size <= (size_t) U32_MAX); |
1185 | op->cls.indata_len = (u32) size; |
1186 | op->payload_len += size; |
1187 | break; |
1188 | case CEPH_OSD_OP_NOTIFY_ACK: |
1189 | case CEPH_OSD_OP_WATCH: |
1190 | /* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */ |
1191 | /* rbd_osd_req_op_create(WATCH, cookie, version, flag) */ |
1192 | op->watch.cookie = va_arg(args, u64); |
1193 | op->watch.ver = va_arg(args, u64); |
1194 | op->watch.ver = cpu_to_le64(op->watch.ver); |
1195 | if (opcode == CEPH_OSD_OP_WATCH && va_arg(args, int)) |
1196 | op->watch.flag = (u8) 1; |
1197 | break; |
1198 | default: |
1199 | rbd_warn(NULL, "unsupported opcode %hu\n", opcode); |
1200 | kfree(op); |
1201 | op = NULL; |
1202 | break; |
1203 | } |
1204 | va_end(args); |
1205 | |
1206 | return op; |
1207 | } |
1208 | |
1209 | static void rbd_osd_req_op_destroy(struct ceph_osd_req_op *op) |
1210 | { |
1211 | kfree(op); |
1212 | } |
1213 | |
1214 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1215 | struct rbd_obj_request *obj_request) |
1216 | { |
1217 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1218 | |
1219 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1220 | } |
1221 | |
1222 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1223 | { |
1224 | dout("%s: img %p\n", __func__, img_request); |
1225 | if (img_request->callback) |
1226 | img_request->callback(img_request); |
1227 | else |
1228 | rbd_img_request_put(img_request); |
1229 | } |
1230 | |
1231 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1232 | |
1233 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) |
1234 | { |
1235 | dout("%s: obj %p\n", __func__, obj_request); |
1236 | |
1237 | return wait_for_completion_interruptible(&obj_request->completion); |
1238 | } |
1239 | |
1240 | static void obj_request_done_init(struct rbd_obj_request *obj_request) |
1241 | { |
1242 | atomic_set(&obj_request->done, 0); |
1243 | smp_wmb(); |
1244 | } |
1245 | |
1246 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
1247 | { |
1248 | int done; |
1249 | |
1250 | done = atomic_inc_return(&obj_request->done); |
1251 | if (done > 1) { |
1252 | struct rbd_img_request *img_request = obj_request->img_request; |
1253 | struct rbd_device *rbd_dev; |
1254 | |
1255 | rbd_dev = img_request ? img_request->rbd_dev : NULL; |
1256 | rbd_warn(rbd_dev, "obj_request %p was already done\n", |
1257 | obj_request); |
1258 | } |
1259 | } |
1260 | |
1261 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
1262 | { |
1263 | smp_mb(); |
1264 | return atomic_read(&obj_request->done) != 0; |
1265 | } |
1266 | |
1267 | static void |
1268 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) |
1269 | { |
1270 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1271 | obj_request, obj_request->img_request, obj_request->result, |
1272 | obj_request->xferred, obj_request->length); |
1273 | /* |
1274 | * ENOENT means a hole in the image. We zero-fill the |
1275 | * entire length of the request. A short read also implies |
1276 | * zero-fill to the end of the request. Either way we |
1277 | * update the xferred count to indicate the whole request |
1278 | * was satisfied. |
1279 | */ |
1280 | BUG_ON(obj_request->type != OBJ_REQUEST_BIO); |
1281 | if (obj_request->result == -ENOENT) { |
1282 | zero_bio_chain(obj_request->bio_list, 0); |
1283 | obj_request->result = 0; |
1284 | obj_request->xferred = obj_request->length; |
1285 | } else if (obj_request->xferred < obj_request->length && |
1286 | !obj_request->result) { |
1287 | zero_bio_chain(obj_request->bio_list, obj_request->xferred); |
1288 | obj_request->xferred = obj_request->length; |
1289 | } |
1290 | obj_request_done_set(obj_request); |
1291 | } |
1292 | |
1293 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1294 | { |
1295 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1296 | obj_request->callback); |
1297 | if (obj_request->callback) |
1298 | obj_request->callback(obj_request); |
1299 | else |
1300 | complete_all(&obj_request->completion); |
1301 | } |
1302 | |
1303 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
1304 | { |
1305 | dout("%s: obj %p\n", __func__, obj_request); |
1306 | obj_request_done_set(obj_request); |
1307 | } |
1308 | |
1309 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
1310 | { |
1311 | dout("%s: obj %p result %d %llu/%llu\n", __func__, obj_request, |
1312 | obj_request->result, obj_request->xferred, obj_request->length); |
1313 | if (obj_request->img_request) |
1314 | rbd_img_obj_request_read_callback(obj_request); |
1315 | else |
1316 | obj_request_done_set(obj_request); |
1317 | } |
1318 | |
1319 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
1320 | { |
1321 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1322 | obj_request->result, obj_request->length); |
1323 | /* |
1324 | * There is no such thing as a successful short write. |
1325 | * Our xferred value is the number of bytes transferred |
1326 | * back. Set it to our originally-requested length. |
1327 | */ |
1328 | obj_request->xferred = obj_request->length; |
1329 | obj_request_done_set(obj_request); |
1330 | } |
1331 | |
1332 | /* |
1333 | * For a simple stat call there's nothing to do. We'll do more if |
1334 | * this is part of a write sequence for a layered image. |
1335 | */ |
1336 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
1337 | { |
1338 | dout("%s: obj %p\n", __func__, obj_request); |
1339 | obj_request_done_set(obj_request); |
1340 | } |
1341 | |
1342 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1343 | struct ceph_msg *msg) |
1344 | { |
1345 | struct rbd_obj_request *obj_request = osd_req->r_priv; |
1346 | u16 opcode; |
1347 | |
1348 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
1349 | rbd_assert(osd_req == obj_request->osd_req); |
1350 | rbd_assert(!!obj_request->img_request ^ |
1351 | (obj_request->which == BAD_WHICH)); |
1352 | |
1353 | if (osd_req->r_result < 0) |
1354 | obj_request->result = osd_req->r_result; |
1355 | obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); |
1356 | |
1357 | WARN_ON(osd_req->r_num_ops != 1); /* For now */ |
1358 | |
1359 | /* |
1360 | * We support a 64-bit length, but ultimately it has to be |
1361 | * passed to blk_end_request(), which takes an unsigned int. |
1362 | */ |
1363 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
1364 | rbd_assert(obj_request->xferred < (u64) UINT_MAX); |
1365 | opcode = osd_req->r_request_ops[0].op; |
1366 | switch (opcode) { |
1367 | case CEPH_OSD_OP_READ: |
1368 | rbd_osd_read_callback(obj_request); |
1369 | break; |
1370 | case CEPH_OSD_OP_WRITE: |
1371 | rbd_osd_write_callback(obj_request); |
1372 | break; |
1373 | case CEPH_OSD_OP_STAT: |
1374 | rbd_osd_stat_callback(obj_request); |
1375 | break; |
1376 | case CEPH_OSD_OP_CALL: |
1377 | case CEPH_OSD_OP_NOTIFY_ACK: |
1378 | case CEPH_OSD_OP_WATCH: |
1379 | rbd_osd_trivial_callback(obj_request); |
1380 | break; |
1381 | default: |
1382 | rbd_warn(NULL, "%s: unsupported op %hu\n", |
1383 | obj_request->object_name, (unsigned short) opcode); |
1384 | break; |
1385 | } |
1386 | |
1387 | if (obj_request_done_test(obj_request)) |
1388 | rbd_obj_request_complete(obj_request); |
1389 | } |
1390 | |
1391 | static struct ceph_osd_request *rbd_osd_req_create( |
1392 | struct rbd_device *rbd_dev, |
1393 | bool write_request, |
1394 | struct rbd_obj_request *obj_request, |
1395 | struct ceph_osd_req_op *op) |
1396 | { |
1397 | struct rbd_img_request *img_request = obj_request->img_request; |
1398 | struct ceph_snap_context *snapc = NULL; |
1399 | struct ceph_osd_client *osdc; |
1400 | struct ceph_osd_request *osd_req; |
1401 | struct timespec now; |
1402 | struct timespec *mtime; |
1403 | u64 snap_id = CEPH_NOSNAP; |
1404 | u64 offset = obj_request->offset; |
1405 | u64 length = obj_request->length; |
1406 | |
1407 | if (img_request) { |
1408 | rbd_assert(img_request->write_request == write_request); |
1409 | if (img_request->write_request) |
1410 | snapc = img_request->snapc; |
1411 | else |
1412 | snap_id = img_request->snap_id; |
1413 | } |
1414 | |
1415 | /* Allocate and initialize the request, for the single op */ |
1416 | |
1417 | osdc = &rbd_dev->rbd_client->client->osdc; |
1418 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); |
1419 | if (!osd_req) |
1420 | return NULL; /* ENOMEM */ |
1421 | |
1422 | rbd_assert(obj_request_type_valid(obj_request->type)); |
1423 | switch (obj_request->type) { |
1424 | case OBJ_REQUEST_NODATA: |
1425 | break; /* Nothing to do */ |
1426 | case OBJ_REQUEST_BIO: |
1427 | rbd_assert(obj_request->bio_list != NULL); |
1428 | osd_req->r_bio = obj_request->bio_list; |
1429 | break; |
1430 | case OBJ_REQUEST_PAGES: |
1431 | osd_req->r_pages = obj_request->pages; |
1432 | osd_req->r_num_pages = obj_request->page_count; |
1433 | osd_req->r_page_alignment = offset & ~PAGE_MASK; |
1434 | break; |
1435 | } |
1436 | |
1437 | if (write_request) { |
1438 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
1439 | now = CURRENT_TIME; |
1440 | mtime = &now; |
1441 | } else { |
1442 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
1443 | mtime = NULL; /* not needed for reads */ |
1444 | offset = 0; /* These are not used... */ |
1445 | length = 0; /* ...for osd read requests */ |
1446 | } |
1447 | |
1448 | osd_req->r_callback = rbd_osd_req_callback; |
1449 | osd_req->r_priv = obj_request; |
1450 | |
1451 | osd_req->r_oid_len = strlen(obj_request->object_name); |
1452 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); |
1453 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); |
1454 | |
1455 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ |
1456 | |
1457 | /* osd_req will get its own reference to snapc (if non-null) */ |
1458 | |
1459 | ceph_osdc_build_request(osd_req, offset, length, 1, op, |
1460 | snapc, snap_id, mtime); |
1461 | |
1462 | return osd_req; |
1463 | } |
1464 | |
1465 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1466 | { |
1467 | ceph_osdc_put_request(osd_req); |
1468 | } |
1469 | |
1470 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ |
1471 | |
1472 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, |
1473 | u64 offset, u64 length, |
1474 | enum obj_request_type type) |
1475 | { |
1476 | struct rbd_obj_request *obj_request; |
1477 | size_t size; |
1478 | char *name; |
1479 | |
1480 | rbd_assert(obj_request_type_valid(type)); |
1481 | |
1482 | size = strlen(object_name) + 1; |
1483 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); |
1484 | if (!obj_request) |
1485 | return NULL; |
1486 | |
1487 | name = (char *)(obj_request + 1); |
1488 | obj_request->object_name = memcpy(name, object_name, size); |
1489 | obj_request->offset = offset; |
1490 | obj_request->length = length; |
1491 | obj_request->which = BAD_WHICH; |
1492 | obj_request->type = type; |
1493 | INIT_LIST_HEAD(&obj_request->links); |
1494 | obj_request_done_init(obj_request); |
1495 | init_completion(&obj_request->completion); |
1496 | kref_init(&obj_request->kref); |
1497 | |
1498 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1499 | offset, length, (int)type, obj_request); |
1500 | |
1501 | return obj_request; |
1502 | } |
1503 | |
1504 | static void rbd_obj_request_destroy(struct kref *kref) |
1505 | { |
1506 | struct rbd_obj_request *obj_request; |
1507 | |
1508 | obj_request = container_of(kref, struct rbd_obj_request, kref); |
1509 | |
1510 | dout("%s: obj %p\n", __func__, obj_request); |
1511 | |
1512 | rbd_assert(obj_request->img_request == NULL); |
1513 | rbd_assert(obj_request->which == BAD_WHICH); |
1514 | |
1515 | if (obj_request->osd_req) |
1516 | rbd_osd_req_destroy(obj_request->osd_req); |
1517 | |
1518 | rbd_assert(obj_request_type_valid(obj_request->type)); |
1519 | switch (obj_request->type) { |
1520 | case OBJ_REQUEST_NODATA: |
1521 | break; /* Nothing to do */ |
1522 | case OBJ_REQUEST_BIO: |
1523 | if (obj_request->bio_list) |
1524 | bio_chain_put(obj_request->bio_list); |
1525 | break; |
1526 | case OBJ_REQUEST_PAGES: |
1527 | if (obj_request->pages) |
1528 | ceph_release_page_vector(obj_request->pages, |
1529 | obj_request->page_count); |
1530 | break; |
1531 | } |
1532 | |
1533 | kfree(obj_request); |
1534 | } |
1535 | |
1536 | /* |
1537 | * Caller is responsible for filling in the list of object requests |
1538 | * that comprises the image request, and the Linux request pointer |
1539 | * (if there is one). |
1540 | */ |
1541 | static struct rbd_img_request *rbd_img_request_create( |
1542 | struct rbd_device *rbd_dev, |
1543 | u64 offset, u64 length, |
1544 | bool write_request) |
1545 | { |
1546 | struct rbd_img_request *img_request; |
1547 | struct ceph_snap_context *snapc = NULL; |
1548 | |
1549 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); |
1550 | if (!img_request) |
1551 | return NULL; |
1552 | |
1553 | if (write_request) { |
1554 | down_read(&rbd_dev->header_rwsem); |
1555 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
1556 | up_read(&rbd_dev->header_rwsem); |
1557 | if (WARN_ON(!snapc)) { |
1558 | kfree(img_request); |
1559 | return NULL; /* Shouldn't happen */ |
1560 | } |
1561 | } |
1562 | |
1563 | img_request->rq = NULL; |
1564 | img_request->rbd_dev = rbd_dev; |
1565 | img_request->offset = offset; |
1566 | img_request->length = length; |
1567 | img_request->write_request = write_request; |
1568 | if (write_request) |
1569 | img_request->snapc = snapc; |
1570 | else |
1571 | img_request->snap_id = rbd_dev->spec->snap_id; |
1572 | spin_lock_init(&img_request->completion_lock); |
1573 | img_request->next_completion = 0; |
1574 | img_request->callback = NULL; |
1575 | img_request->obj_request_count = 0; |
1576 | INIT_LIST_HEAD(&img_request->obj_requests); |
1577 | kref_init(&img_request->kref); |
1578 | |
1579 | rbd_img_request_get(img_request); /* Avoid a warning */ |
1580 | rbd_img_request_put(img_request); /* TEMPORARY */ |
1581 | |
1582 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1583 | write_request ? "write" : "read", offset, length, |
1584 | img_request); |
1585 | |
1586 | return img_request; |
1587 | } |
1588 | |
1589 | static void rbd_img_request_destroy(struct kref *kref) |
1590 | { |
1591 | struct rbd_img_request *img_request; |
1592 | struct rbd_obj_request *obj_request; |
1593 | struct rbd_obj_request *next_obj_request; |
1594 | |
1595 | img_request = container_of(kref, struct rbd_img_request, kref); |
1596 | |
1597 | dout("%s: img %p\n", __func__, img_request); |
1598 | |
1599 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1600 | rbd_img_obj_request_del(img_request, obj_request); |
1601 | rbd_assert(img_request->obj_request_count == 0); |
1602 | |
1603 | if (img_request->write_request) |
1604 | ceph_put_snap_context(img_request->snapc); |
1605 | |
1606 | kfree(img_request); |
1607 | } |
1608 | |
1609 | static int rbd_img_request_fill_bio(struct rbd_img_request *img_request, |
1610 | struct bio *bio_list) |
1611 | { |
1612 | struct rbd_device *rbd_dev = img_request->rbd_dev; |
1613 | struct rbd_obj_request *obj_request = NULL; |
1614 | struct rbd_obj_request *next_obj_request; |
1615 | unsigned int bio_offset; |
1616 | u64 image_offset; |
1617 | u64 resid; |
1618 | u16 opcode; |
1619 | |
1620 | dout("%s: img %p bio %p\n", __func__, img_request, bio_list); |
1621 | |
1622 | opcode = img_request->write_request ? CEPH_OSD_OP_WRITE |
1623 | : CEPH_OSD_OP_READ; |
1624 | bio_offset = 0; |
1625 | image_offset = img_request->offset; |
1626 | rbd_assert(image_offset == bio_list->bi_sector << SECTOR_SHIFT); |
1627 | resid = img_request->length; |
1628 | rbd_assert(resid > 0); |
1629 | while (resid) { |
1630 | const char *object_name; |
1631 | unsigned int clone_size; |
1632 | struct ceph_osd_req_op *op; |
1633 | u64 offset; |
1634 | u64 length; |
1635 | |
1636 | object_name = rbd_segment_name(rbd_dev, image_offset); |
1637 | if (!object_name) |
1638 | goto out_unwind; |
1639 | offset = rbd_segment_offset(rbd_dev, image_offset); |
1640 | length = rbd_segment_length(rbd_dev, image_offset, resid); |
1641 | obj_request = rbd_obj_request_create(object_name, |
1642 | offset, length, |
1643 | OBJ_REQUEST_BIO); |
1644 | kfree(object_name); /* object request has its own copy */ |
1645 | if (!obj_request) |
1646 | goto out_unwind; |
1647 | |
1648 | rbd_assert(length <= (u64) UINT_MAX); |
1649 | clone_size = (unsigned int) length; |
1650 | obj_request->bio_list = bio_chain_clone_range(&bio_list, |
1651 | &bio_offset, clone_size, |
1652 | GFP_ATOMIC); |
1653 | if (!obj_request->bio_list) |
1654 | goto out_partial; |
1655 | |
1656 | /* |
1657 | * Build up the op to use in building the osd |
1658 | * request. Note that the contents of the op are |
1659 | * copied by rbd_osd_req_create(). |
1660 | */ |
1661 | op = rbd_osd_req_op_create(opcode, offset, length); |
1662 | if (!op) |
1663 | goto out_partial; |
1664 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, |
1665 | img_request->write_request, |
1666 | obj_request, op); |
1667 | rbd_osd_req_op_destroy(op); |
1668 | if (!obj_request->osd_req) |
1669 | goto out_partial; |
1670 | /* status and version are initially zero-filled */ |
1671 | |
1672 | rbd_img_obj_request_add(img_request, obj_request); |
1673 | |
1674 | image_offset += length; |
1675 | resid -= length; |
1676 | } |
1677 | |
1678 | return 0; |
1679 | |
1680 | out_partial: |
1681 | rbd_obj_request_put(obj_request); |
1682 | out_unwind: |
1683 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1684 | rbd_obj_request_put(obj_request); |
1685 | |
1686 | return -ENOMEM; |
1687 | } |
1688 | |
1689 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1690 | { |
1691 | struct rbd_img_request *img_request; |
1692 | u32 which = obj_request->which; |
1693 | bool more = true; |
1694 | |
1695 | img_request = obj_request->img_request; |
1696 | |
1697 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
1698 | rbd_assert(img_request != NULL); |
1699 | rbd_assert(img_request->rq != NULL); |
1700 | rbd_assert(img_request->obj_request_count > 0); |
1701 | rbd_assert(which != BAD_WHICH); |
1702 | rbd_assert(which < img_request->obj_request_count); |
1703 | rbd_assert(which >= img_request->next_completion); |
1704 | |
1705 | spin_lock_irq(&img_request->completion_lock); |
1706 | if (which != img_request->next_completion) |
1707 | goto out; |
1708 | |
1709 | for_each_obj_request_from(img_request, obj_request) { |
1710 | unsigned int xferred; |
1711 | int result; |
1712 | |
1713 | rbd_assert(more); |
1714 | rbd_assert(which < img_request->obj_request_count); |
1715 | |
1716 | if (!obj_request_done_test(obj_request)) |
1717 | break; |
1718 | |
1719 | rbd_assert(obj_request->xferred <= (u64) UINT_MAX); |
1720 | xferred = (unsigned int) obj_request->xferred; |
1721 | result = (int) obj_request->result; |
1722 | if (result) |
1723 | rbd_warn(NULL, "obj_request %s result %d xferred %u\n", |
1724 | img_request->write_request ? "write" : "read", |
1725 | result, xferred); |
1726 | |
1727 | more = blk_end_request(img_request->rq, result, xferred); |
1728 | which++; |
1729 | } |
1730 | |
1731 | rbd_assert(more ^ (which == img_request->obj_request_count)); |
1732 | img_request->next_completion = which; |
1733 | out: |
1734 | spin_unlock_irq(&img_request->completion_lock); |
1735 | |
1736 | if (!more) |
1737 | rbd_img_request_complete(img_request); |
1738 | } |
1739 | |
1740 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
1741 | { |
1742 | struct rbd_device *rbd_dev = img_request->rbd_dev; |
1743 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1744 | struct rbd_obj_request *obj_request; |
1745 | struct rbd_obj_request *next_obj_request; |
1746 | |
1747 | dout("%s: img %p\n", __func__, img_request); |
1748 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
1749 | int ret; |
1750 | |
1751 | obj_request->callback = rbd_img_obj_callback; |
1752 | ret = rbd_obj_request_submit(osdc, obj_request); |
1753 | if (ret) |
1754 | return ret; |
1755 | /* |
1756 | * The image request has its own reference to each |
1757 | * of its object requests, so we can safely drop the |
1758 | * initial one here. |
1759 | */ |
1760 | rbd_obj_request_put(obj_request); |
1761 | } |
1762 | |
1763 | return 0; |
1764 | } |
1765 | |
1766 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, |
1767 | u64 ver, u64 notify_id) |
1768 | { |
1769 | struct rbd_obj_request *obj_request; |
1770 | struct ceph_osd_req_op *op; |
1771 | struct ceph_osd_client *osdc; |
1772 | int ret; |
1773 | |
1774 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
1775 | OBJ_REQUEST_NODATA); |
1776 | if (!obj_request) |
1777 | return -ENOMEM; |
1778 | |
1779 | ret = -ENOMEM; |
1780 | op = rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK, notify_id, ver); |
1781 | if (!op) |
1782 | goto out; |
1783 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
1784 | obj_request, op); |
1785 | rbd_osd_req_op_destroy(op); |
1786 | if (!obj_request->osd_req) |
1787 | goto out; |
1788 | |
1789 | osdc = &rbd_dev->rbd_client->client->osdc; |
1790 | obj_request->callback = rbd_obj_request_put; |
1791 | ret = rbd_obj_request_submit(osdc, obj_request); |
1792 | out: |
1793 | if (ret) |
1794 | rbd_obj_request_put(obj_request); |
1795 | |
1796 | return ret; |
1797 | } |
1798 | |
1799 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) |
1800 | { |
1801 | struct rbd_device *rbd_dev = (struct rbd_device *)data; |
1802 | u64 hver; |
1803 | int rc; |
1804 | |
1805 | if (!rbd_dev) |
1806 | return; |
1807 | |
1808 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
1809 | rbd_dev->header_name, (unsigned long long) notify_id, |
1810 | (unsigned int) opcode); |
1811 | rc = rbd_dev_refresh(rbd_dev, &hver); |
1812 | if (rc) |
1813 | rbd_warn(rbd_dev, "got notification but failed to " |
1814 | " update snaps: %d\n", rc); |
1815 | |
1816 | rbd_obj_notify_ack(rbd_dev, hver, notify_id); |
1817 | } |
1818 | |
1819 | /* |
1820 | * Request sync osd watch/unwatch. The value of "start" determines |
1821 | * whether a watch request is being initiated or torn down. |
1822 | */ |
1823 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) |
1824 | { |
1825 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
1826 | struct rbd_obj_request *obj_request; |
1827 | struct ceph_osd_req_op *op; |
1828 | int ret; |
1829 | |
1830 | rbd_assert(start ^ !!rbd_dev->watch_event); |
1831 | rbd_assert(start ^ !!rbd_dev->watch_request); |
1832 | |
1833 | if (start) { |
1834 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
1835 | &rbd_dev->watch_event); |
1836 | if (ret < 0) |
1837 | return ret; |
1838 | rbd_assert(rbd_dev->watch_event != NULL); |
1839 | } |
1840 | |
1841 | ret = -ENOMEM; |
1842 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
1843 | OBJ_REQUEST_NODATA); |
1844 | if (!obj_request) |
1845 | goto out_cancel; |
1846 | |
1847 | op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH, |
1848 | rbd_dev->watch_event->cookie, |
1849 | rbd_dev->header.obj_version, start); |
1850 | if (!op) |
1851 | goto out_cancel; |
1852 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, |
1853 | obj_request, op); |
1854 | rbd_osd_req_op_destroy(op); |
1855 | if (!obj_request->osd_req) |
1856 | goto out_cancel; |
1857 | |
1858 | if (start) |
1859 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
1860 | else |
1861 | ceph_osdc_unregister_linger_request(osdc, |
1862 | rbd_dev->watch_request->osd_req); |
1863 | ret = rbd_obj_request_submit(osdc, obj_request); |
1864 | if (ret) |
1865 | goto out_cancel; |
1866 | ret = rbd_obj_request_wait(obj_request); |
1867 | if (ret) |
1868 | goto out_cancel; |
1869 | ret = obj_request->result; |
1870 | if (ret) |
1871 | goto out_cancel; |
1872 | |
1873 | /* |
1874 | * A watch request is set to linger, so the underlying osd |
1875 | * request won't go away until we unregister it. We retain |
1876 | * a pointer to the object request during that time (in |
1877 | * rbd_dev->watch_request), so we'll keep a reference to |
1878 | * it. We'll drop that reference (below) after we've |
1879 | * unregistered it. |
1880 | */ |
1881 | if (start) { |
1882 | rbd_dev->watch_request = obj_request; |
1883 | |
1884 | return 0; |
1885 | } |
1886 | |
1887 | /* We have successfully torn down the watch request */ |
1888 | |
1889 | rbd_obj_request_put(rbd_dev->watch_request); |
1890 | rbd_dev->watch_request = NULL; |
1891 | out_cancel: |
1892 | /* Cancel the event if we're tearing down, or on error */ |
1893 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
1894 | rbd_dev->watch_event = NULL; |
1895 | if (obj_request) |
1896 | rbd_obj_request_put(obj_request); |
1897 | |
1898 | return ret; |
1899 | } |
1900 | |
1901 | /* |
1902 | * Synchronous osd object method call |
1903 | */ |
1904 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
1905 | const char *object_name, |
1906 | const char *class_name, |
1907 | const char *method_name, |
1908 | const char *outbound, |
1909 | size_t outbound_size, |
1910 | char *inbound, |
1911 | size_t inbound_size, |
1912 | u64 *version) |
1913 | { |
1914 | struct rbd_obj_request *obj_request; |
1915 | struct ceph_osd_client *osdc; |
1916 | struct ceph_osd_req_op *op; |
1917 | struct page **pages; |
1918 | u32 page_count; |
1919 | int ret; |
1920 | |
1921 | /* |
1922 | * Method calls are ultimately read operations but they |
1923 | * don't involve object data (so no offset or length). |
1924 | * The result should placed into the inbound buffer |
1925 | * provided. They also supply outbound data--parameters for |
1926 | * the object method. Currently if this is present it will |
1927 | * be a snapshot id. |
1928 | */ |
1929 | page_count = (u32) calc_pages_for(0, inbound_size); |
1930 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
1931 | if (IS_ERR(pages)) |
1932 | return PTR_ERR(pages); |
1933 | |
1934 | ret = -ENOMEM; |
1935 | obj_request = rbd_obj_request_create(object_name, 0, 0, |
1936 | OBJ_REQUEST_PAGES); |
1937 | if (!obj_request) |
1938 | goto out; |
1939 | |
1940 | obj_request->pages = pages; |
1941 | obj_request->page_count = page_count; |
1942 | |
1943 | op = rbd_osd_req_op_create(CEPH_OSD_OP_CALL, class_name, |
1944 | method_name, outbound, outbound_size); |
1945 | if (!op) |
1946 | goto out; |
1947 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
1948 | obj_request, op); |
1949 | rbd_osd_req_op_destroy(op); |
1950 | if (!obj_request->osd_req) |
1951 | goto out; |
1952 | |
1953 | osdc = &rbd_dev->rbd_client->client->osdc; |
1954 | ret = rbd_obj_request_submit(osdc, obj_request); |
1955 | if (ret) |
1956 | goto out; |
1957 | ret = rbd_obj_request_wait(obj_request); |
1958 | if (ret) |
1959 | goto out; |
1960 | |
1961 | ret = obj_request->result; |
1962 | if (ret < 0) |
1963 | goto out; |
1964 | ret = 0; |
1965 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
1966 | if (version) |
1967 | *version = obj_request->version; |
1968 | out: |
1969 | if (obj_request) |
1970 | rbd_obj_request_put(obj_request); |
1971 | else |
1972 | ceph_release_page_vector(pages, page_count); |
1973 | |
1974 | return ret; |
1975 | } |
1976 | |
1977 | static void rbd_request_fn(struct request_queue *q) |
1978 | __releases(q->queue_lock) __acquires(q->queue_lock) |
1979 | { |
1980 | struct rbd_device *rbd_dev = q->queuedata; |
1981 | bool read_only = rbd_dev->mapping.read_only; |
1982 | struct request *rq; |
1983 | int result; |
1984 | |
1985 | while ((rq = blk_fetch_request(q))) { |
1986 | bool write_request = rq_data_dir(rq) == WRITE; |
1987 | struct rbd_img_request *img_request; |
1988 | u64 offset; |
1989 | u64 length; |
1990 | |
1991 | /* Ignore any non-FS requests that filter through. */ |
1992 | |
1993 | if (rq->cmd_type != REQ_TYPE_FS) { |
1994 | dout("%s: non-fs request type %d\n", __func__, |
1995 | (int) rq->cmd_type); |
1996 | __blk_end_request_all(rq, 0); |
1997 | continue; |
1998 | } |
1999 | |
2000 | /* Ignore/skip any zero-length requests */ |
2001 | |
2002 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; |
2003 | length = (u64) blk_rq_bytes(rq); |
2004 | |
2005 | if (!length) { |
2006 | dout("%s: zero-length request\n", __func__); |
2007 | __blk_end_request_all(rq, 0); |
2008 | continue; |
2009 | } |
2010 | |
2011 | spin_unlock_irq(q->queue_lock); |
2012 | |
2013 | /* Disallow writes to a read-only device */ |
2014 | |
2015 | if (write_request) { |
2016 | result = -EROFS; |
2017 | if (read_only) |
2018 | goto end_request; |
2019 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
2020 | } |
2021 | |
2022 | /* |
2023 | * Quit early if the mapped snapshot no longer |
2024 | * exists. It's still possible the snapshot will |
2025 | * have disappeared by the time our request arrives |
2026 | * at the osd, but there's no sense in sending it if |
2027 | * we already know. |
2028 | */ |
2029 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { |
2030 | dout("request for non-existent snapshot"); |
2031 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); |
2032 | result = -ENXIO; |
2033 | goto end_request; |
2034 | } |
2035 | |
2036 | result = -EINVAL; |
2037 | if (WARN_ON(offset && length > U64_MAX - offset + 1)) |
2038 | goto end_request; /* Shouldn't happen */ |
2039 | |
2040 | result = -ENOMEM; |
2041 | img_request = rbd_img_request_create(rbd_dev, offset, length, |
2042 | write_request); |
2043 | if (!img_request) |
2044 | goto end_request; |
2045 | |
2046 | img_request->rq = rq; |
2047 | |
2048 | result = rbd_img_request_fill_bio(img_request, rq->bio); |
2049 | if (!result) |
2050 | result = rbd_img_request_submit(img_request); |
2051 | if (result) |
2052 | rbd_img_request_put(img_request); |
2053 | end_request: |
2054 | spin_lock_irq(q->queue_lock); |
2055 | if (result < 0) { |
2056 | rbd_warn(rbd_dev, "obj_request %s result %d\n", |
2057 | write_request ? "write" : "read", result); |
2058 | __blk_end_request_all(rq, result); |
2059 | } |
2060 | } |
2061 | } |
2062 | |
2063 | /* |
2064 | * a queue callback. Makes sure that we don't create a bio that spans across |
2065 | * multiple osd objects. One exception would be with a single page bios, |
2066 | * which we handle later at bio_chain_clone_range() |
2067 | */ |
2068 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2069 | struct bio_vec *bvec) |
2070 | { |
2071 | struct rbd_device *rbd_dev = q->queuedata; |
2072 | sector_t sector_offset; |
2073 | sector_t sectors_per_obj; |
2074 | sector_t obj_sector_offset; |
2075 | int ret; |
2076 | |
2077 | /* |
2078 | * Find how far into its rbd object the partition-relative |
2079 | * bio start sector is to offset relative to the enclosing |
2080 | * device. |
2081 | */ |
2082 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; |
2083 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
2084 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); |
2085 | |
2086 | /* |
2087 | * Compute the number of bytes from that offset to the end |
2088 | * of the object. Account for what's already used by the bio. |
2089 | */ |
2090 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; |
2091 | if (ret > bmd->bi_size) |
2092 | ret -= bmd->bi_size; |
2093 | else |
2094 | ret = 0; |
2095 | |
2096 | /* |
2097 | * Don't send back more than was asked for. And if the bio |
2098 | * was empty, let the whole thing through because: "Note |
2099 | * that a block device *must* allow a single page to be |
2100 | * added to an empty bio." |
2101 | */ |
2102 | rbd_assert(bvec->bv_len <= PAGE_SIZE); |
2103 | if (ret > (int) bvec->bv_len || !bmd->bi_size) |
2104 | ret = (int) bvec->bv_len; |
2105 | |
2106 | return ret; |
2107 | } |
2108 | |
2109 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
2110 | { |
2111 | struct gendisk *disk = rbd_dev->disk; |
2112 | |
2113 | if (!disk) |
2114 | return; |
2115 | |
2116 | if (disk->flags & GENHD_FL_UP) |
2117 | del_gendisk(disk); |
2118 | if (disk->queue) |
2119 | blk_cleanup_queue(disk->queue); |
2120 | put_disk(disk); |
2121 | } |
2122 | |
2123 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2124 | const char *object_name, |
2125 | u64 offset, u64 length, |
2126 | char *buf, u64 *version) |
2127 | |
2128 | { |
2129 | struct ceph_osd_req_op *op; |
2130 | struct rbd_obj_request *obj_request; |
2131 | struct ceph_osd_client *osdc; |
2132 | struct page **pages = NULL; |
2133 | u32 page_count; |
2134 | size_t size; |
2135 | int ret; |
2136 | |
2137 | page_count = (u32) calc_pages_for(offset, length); |
2138 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2139 | if (IS_ERR(pages)) |
2140 | ret = PTR_ERR(pages); |
2141 | |
2142 | ret = -ENOMEM; |
2143 | obj_request = rbd_obj_request_create(object_name, offset, length, |
2144 | OBJ_REQUEST_PAGES); |
2145 | if (!obj_request) |
2146 | goto out; |
2147 | |
2148 | obj_request->pages = pages; |
2149 | obj_request->page_count = page_count; |
2150 | |
2151 | op = rbd_osd_req_op_create(CEPH_OSD_OP_READ, offset, length); |
2152 | if (!op) |
2153 | goto out; |
2154 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
2155 | obj_request, op); |
2156 | rbd_osd_req_op_destroy(op); |
2157 | if (!obj_request->osd_req) |
2158 | goto out; |
2159 | |
2160 | osdc = &rbd_dev->rbd_client->client->osdc; |
2161 | ret = rbd_obj_request_submit(osdc, obj_request); |
2162 | if (ret) |
2163 | goto out; |
2164 | ret = rbd_obj_request_wait(obj_request); |
2165 | if (ret) |
2166 | goto out; |
2167 | |
2168 | ret = obj_request->result; |
2169 | if (ret < 0) |
2170 | goto out; |
2171 | |
2172 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); |
2173 | size = (size_t) obj_request->xferred; |
2174 | ceph_copy_from_page_vector(pages, buf, 0, size); |
2175 | rbd_assert(size <= (size_t) INT_MAX); |
2176 | ret = (int) size; |
2177 | if (version) |
2178 | *version = obj_request->version; |
2179 | out: |
2180 | if (obj_request) |
2181 | rbd_obj_request_put(obj_request); |
2182 | else |
2183 | ceph_release_page_vector(pages, page_count); |
2184 | |
2185 | return ret; |
2186 | } |
2187 | |
2188 | /* |
2189 | * Read the complete header for the given rbd device. |
2190 | * |
2191 | * Returns a pointer to a dynamically-allocated buffer containing |
2192 | * the complete and validated header. Caller can pass the address |
2193 | * of a variable that will be filled in with the version of the |
2194 | * header object at the time it was read. |
2195 | * |
2196 | * Returns a pointer-coded errno if a failure occurs. |
2197 | */ |
2198 | static struct rbd_image_header_ondisk * |
2199 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) |
2200 | { |
2201 | struct rbd_image_header_ondisk *ondisk = NULL; |
2202 | u32 snap_count = 0; |
2203 | u64 names_size = 0; |
2204 | u32 want_count; |
2205 | int ret; |
2206 | |
2207 | /* |
2208 | * The complete header will include an array of its 64-bit |
2209 | * snapshot ids, followed by the names of those snapshots as |
2210 | * a contiguous block of NUL-terminated strings. Note that |
2211 | * the number of snapshots could change by the time we read |
2212 | * it in, in which case we re-read it. |
2213 | */ |
2214 | do { |
2215 | size_t size; |
2216 | |
2217 | kfree(ondisk); |
2218 | |
2219 | size = sizeof (*ondisk); |
2220 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); |
2221 | size += names_size; |
2222 | ondisk = kmalloc(size, GFP_KERNEL); |
2223 | if (!ondisk) |
2224 | return ERR_PTR(-ENOMEM); |
2225 | |
2226 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
2227 | 0, size, |
2228 | (char *) ondisk, version); |
2229 | if (ret < 0) |
2230 | goto out_err; |
2231 | if (WARN_ON((size_t) ret < size)) { |
2232 | ret = -ENXIO; |
2233 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2234 | size, ret); |
2235 | goto out_err; |
2236 | } |
2237 | if (!rbd_dev_ondisk_valid(ondisk)) { |
2238 | ret = -ENXIO; |
2239 | rbd_warn(rbd_dev, "invalid header"); |
2240 | goto out_err; |
2241 | } |
2242 | |
2243 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2244 | want_count = snap_count; |
2245 | snap_count = le32_to_cpu(ondisk->snap_count); |
2246 | } while (snap_count != want_count); |
2247 | |
2248 | return ondisk; |
2249 | |
2250 | out_err: |
2251 | kfree(ondisk); |
2252 | |
2253 | return ERR_PTR(ret); |
2254 | } |
2255 | |
2256 | /* |
2257 | * reload the ondisk the header |
2258 | */ |
2259 | static int rbd_read_header(struct rbd_device *rbd_dev, |
2260 | struct rbd_image_header *header) |
2261 | { |
2262 | struct rbd_image_header_ondisk *ondisk; |
2263 | u64 ver = 0; |
2264 | int ret; |
2265 | |
2266 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
2267 | if (IS_ERR(ondisk)) |
2268 | return PTR_ERR(ondisk); |
2269 | ret = rbd_header_from_disk(header, ondisk); |
2270 | if (ret >= 0) |
2271 | header->obj_version = ver; |
2272 | kfree(ondisk); |
2273 | |
2274 | return ret; |
2275 | } |
2276 | |
2277 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
2278 | { |
2279 | struct rbd_snap *snap; |
2280 | struct rbd_snap *next; |
2281 | |
2282 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
2283 | rbd_remove_snap_dev(snap); |
2284 | } |
2285 | |
2286 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
2287 | { |
2288 | sector_t size; |
2289 | |
2290 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
2291 | return; |
2292 | |
2293 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; |
2294 | dout("setting size to %llu sectors", (unsigned long long) size); |
2295 | rbd_dev->mapping.size = (u64) size; |
2296 | set_capacity(rbd_dev->disk, size); |
2297 | } |
2298 | |
2299 | /* |
2300 | * only read the first part of the ondisk header, without the snaps info |
2301 | */ |
2302 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
2303 | { |
2304 | int ret; |
2305 | struct rbd_image_header h; |
2306 | |
2307 | ret = rbd_read_header(rbd_dev, &h); |
2308 | if (ret < 0) |
2309 | return ret; |
2310 | |
2311 | down_write(&rbd_dev->header_rwsem); |
2312 | |
2313 | /* Update image size, and check for resize of mapped image */ |
2314 | rbd_dev->header.image_size = h.image_size; |
2315 | rbd_update_mapping_size(rbd_dev); |
2316 | |
2317 | /* rbd_dev->header.object_prefix shouldn't change */ |
2318 | kfree(rbd_dev->header.snap_sizes); |
2319 | kfree(rbd_dev->header.snap_names); |
2320 | /* osd requests may still refer to snapc */ |
2321 | ceph_put_snap_context(rbd_dev->header.snapc); |
2322 | |
2323 | if (hver) |
2324 | *hver = h.obj_version; |
2325 | rbd_dev->header.obj_version = h.obj_version; |
2326 | rbd_dev->header.image_size = h.image_size; |
2327 | rbd_dev->header.snapc = h.snapc; |
2328 | rbd_dev->header.snap_names = h.snap_names; |
2329 | rbd_dev->header.snap_sizes = h.snap_sizes; |
2330 | /* Free the extra copy of the object prefix */ |
2331 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); |
2332 | kfree(h.object_prefix); |
2333 | |
2334 | ret = rbd_dev_snaps_update(rbd_dev); |
2335 | if (!ret) |
2336 | ret = rbd_dev_snaps_register(rbd_dev); |
2337 | |
2338 | up_write(&rbd_dev->header_rwsem); |
2339 | |
2340 | return ret; |
2341 | } |
2342 | |
2343 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
2344 | { |
2345 | int ret; |
2346 | |
2347 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
2348 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
2349 | if (rbd_dev->image_format == 1) |
2350 | ret = rbd_dev_v1_refresh(rbd_dev, hver); |
2351 | else |
2352 | ret = rbd_dev_v2_refresh(rbd_dev, hver); |
2353 | mutex_unlock(&ctl_mutex); |
2354 | |
2355 | return ret; |
2356 | } |
2357 | |
2358 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
2359 | { |
2360 | struct gendisk *disk; |
2361 | struct request_queue *q; |
2362 | u64 segment_size; |
2363 | |
2364 | /* create gendisk info */ |
2365 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
2366 | if (!disk) |
2367 | return -ENOMEM; |
2368 | |
2369 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
2370 | rbd_dev->dev_id); |
2371 | disk->major = rbd_dev->major; |
2372 | disk->first_minor = 0; |
2373 | disk->fops = &rbd_bd_ops; |
2374 | disk->private_data = rbd_dev; |
2375 | |
2376 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
2377 | if (!q) |
2378 | goto out_disk; |
2379 | |
2380 | /* We use the default size, but let's be explicit about it. */ |
2381 | blk_queue_physical_block_size(q, SECTOR_SIZE); |
2382 | |
2383 | /* set io sizes to object size */ |
2384 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
2385 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); |
2386 | blk_queue_max_segment_size(q, segment_size); |
2387 | blk_queue_io_min(q, segment_size); |
2388 | blk_queue_io_opt(q, segment_size); |
2389 | |
2390 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
2391 | disk->queue = q; |
2392 | |
2393 | q->queuedata = rbd_dev; |
2394 | |
2395 | rbd_dev->disk = disk; |
2396 | |
2397 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
2398 | |
2399 | return 0; |
2400 | out_disk: |
2401 | put_disk(disk); |
2402 | |
2403 | return -ENOMEM; |
2404 | } |
2405 | |
2406 | /* |
2407 | sysfs |
2408 | */ |
2409 | |
2410 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
2411 | { |
2412 | return container_of(dev, struct rbd_device, dev); |
2413 | } |
2414 | |
2415 | static ssize_t rbd_size_show(struct device *dev, |
2416 | struct device_attribute *attr, char *buf) |
2417 | { |
2418 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2419 | sector_t size; |
2420 | |
2421 | down_read(&rbd_dev->header_rwsem); |
2422 | size = get_capacity(rbd_dev->disk); |
2423 | up_read(&rbd_dev->header_rwsem); |
2424 | |
2425 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
2426 | } |
2427 | |
2428 | /* |
2429 | * Note this shows the features for whatever's mapped, which is not |
2430 | * necessarily the base image. |
2431 | */ |
2432 | static ssize_t rbd_features_show(struct device *dev, |
2433 | struct device_attribute *attr, char *buf) |
2434 | { |
2435 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2436 | |
2437 | return sprintf(buf, "0x%016llx\n", |
2438 | (unsigned long long) rbd_dev->mapping.features); |
2439 | } |
2440 | |
2441 | static ssize_t rbd_major_show(struct device *dev, |
2442 | struct device_attribute *attr, char *buf) |
2443 | { |
2444 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2445 | |
2446 | return sprintf(buf, "%d\n", rbd_dev->major); |
2447 | } |
2448 | |
2449 | static ssize_t rbd_client_id_show(struct device *dev, |
2450 | struct device_attribute *attr, char *buf) |
2451 | { |
2452 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2453 | |
2454 | return sprintf(buf, "client%lld\n", |
2455 | ceph_client_id(rbd_dev->rbd_client->client)); |
2456 | } |
2457 | |
2458 | static ssize_t rbd_pool_show(struct device *dev, |
2459 | struct device_attribute *attr, char *buf) |
2460 | { |
2461 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2462 | |
2463 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
2464 | } |
2465 | |
2466 | static ssize_t rbd_pool_id_show(struct device *dev, |
2467 | struct device_attribute *attr, char *buf) |
2468 | { |
2469 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2470 | |
2471 | return sprintf(buf, "%llu\n", |
2472 | (unsigned long long) rbd_dev->spec->pool_id); |
2473 | } |
2474 | |
2475 | static ssize_t rbd_name_show(struct device *dev, |
2476 | struct device_attribute *attr, char *buf) |
2477 | { |
2478 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2479 | |
2480 | if (rbd_dev->spec->image_name) |
2481 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); |
2482 | |
2483 | return sprintf(buf, "(unknown)\n"); |
2484 | } |
2485 | |
2486 | static ssize_t rbd_image_id_show(struct device *dev, |
2487 | struct device_attribute *attr, char *buf) |
2488 | { |
2489 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2490 | |
2491 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
2492 | } |
2493 | |
2494 | /* |
2495 | * Shows the name of the currently-mapped snapshot (or |
2496 | * RBD_SNAP_HEAD_NAME for the base image). |
2497 | */ |
2498 | static ssize_t rbd_snap_show(struct device *dev, |
2499 | struct device_attribute *attr, |
2500 | char *buf) |
2501 | { |
2502 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2503 | |
2504 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
2505 | } |
2506 | |
2507 | /* |
2508 | * For an rbd v2 image, shows the pool id, image id, and snapshot id |
2509 | * for the parent image. If there is no parent, simply shows |
2510 | * "(no parent image)". |
2511 | */ |
2512 | static ssize_t rbd_parent_show(struct device *dev, |
2513 | struct device_attribute *attr, |
2514 | char *buf) |
2515 | { |
2516 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2517 | struct rbd_spec *spec = rbd_dev->parent_spec; |
2518 | int count; |
2519 | char *bufp = buf; |
2520 | |
2521 | if (!spec) |
2522 | return sprintf(buf, "(no parent image)\n"); |
2523 | |
2524 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", |
2525 | (unsigned long long) spec->pool_id, spec->pool_name); |
2526 | if (count < 0) |
2527 | return count; |
2528 | bufp += count; |
2529 | |
2530 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, |
2531 | spec->image_name ? spec->image_name : "(unknown)"); |
2532 | if (count < 0) |
2533 | return count; |
2534 | bufp += count; |
2535 | |
2536 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", |
2537 | (unsigned long long) spec->snap_id, spec->snap_name); |
2538 | if (count < 0) |
2539 | return count; |
2540 | bufp += count; |
2541 | |
2542 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); |
2543 | if (count < 0) |
2544 | return count; |
2545 | bufp += count; |
2546 | |
2547 | return (ssize_t) (bufp - buf); |
2548 | } |
2549 | |
2550 | static ssize_t rbd_image_refresh(struct device *dev, |
2551 | struct device_attribute *attr, |
2552 | const char *buf, |
2553 | size_t size) |
2554 | { |
2555 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
2556 | int ret; |
2557 | |
2558 | ret = rbd_dev_refresh(rbd_dev, NULL); |
2559 | |
2560 | return ret < 0 ? ret : size; |
2561 | } |
2562 | |
2563 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
2564 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
2565 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
2566 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
2567 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
2568 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
2569 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
2570 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
2571 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
2572 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); |
2573 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
2574 | |
2575 | static struct attribute *rbd_attrs[] = { |
2576 | &dev_attr_size.attr, |
2577 | &dev_attr_features.attr, |
2578 | &dev_attr_major.attr, |
2579 | &dev_attr_client_id.attr, |
2580 | &dev_attr_pool.attr, |
2581 | &dev_attr_pool_id.attr, |
2582 | &dev_attr_name.attr, |
2583 | &dev_attr_image_id.attr, |
2584 | &dev_attr_current_snap.attr, |
2585 | &dev_attr_parent.attr, |
2586 | &dev_attr_refresh.attr, |
2587 | NULL |
2588 | }; |
2589 | |
2590 | static struct attribute_group rbd_attr_group = { |
2591 | .attrs = rbd_attrs, |
2592 | }; |
2593 | |
2594 | static const struct attribute_group *rbd_attr_groups[] = { |
2595 | &rbd_attr_group, |
2596 | NULL |
2597 | }; |
2598 | |
2599 | static void rbd_sysfs_dev_release(struct device *dev) |
2600 | { |
2601 | } |
2602 | |
2603 | static struct device_type rbd_device_type = { |
2604 | .name = "rbd", |
2605 | .groups = rbd_attr_groups, |
2606 | .release = rbd_sysfs_dev_release, |
2607 | }; |
2608 | |
2609 | |
2610 | /* |
2611 | sysfs - snapshots |
2612 | */ |
2613 | |
2614 | static ssize_t rbd_snap_size_show(struct device *dev, |
2615 | struct device_attribute *attr, |
2616 | char *buf) |
2617 | { |
2618 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
2619 | |
2620 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
2621 | } |
2622 | |
2623 | static ssize_t rbd_snap_id_show(struct device *dev, |
2624 | struct device_attribute *attr, |
2625 | char *buf) |
2626 | { |
2627 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
2628 | |
2629 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
2630 | } |
2631 | |
2632 | static ssize_t rbd_snap_features_show(struct device *dev, |
2633 | struct device_attribute *attr, |
2634 | char *buf) |
2635 | { |
2636 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
2637 | |
2638 | return sprintf(buf, "0x%016llx\n", |
2639 | (unsigned long long) snap->features); |
2640 | } |
2641 | |
2642 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2643 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
2644 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
2645 | |
2646 | static struct attribute *rbd_snap_attrs[] = { |
2647 | &dev_attr_snap_size.attr, |
2648 | &dev_attr_snap_id.attr, |
2649 | &dev_attr_snap_features.attr, |
2650 | NULL, |
2651 | }; |
2652 | |
2653 | static struct attribute_group rbd_snap_attr_group = { |
2654 | .attrs = rbd_snap_attrs, |
2655 | }; |
2656 | |
2657 | static void rbd_snap_dev_release(struct device *dev) |
2658 | { |
2659 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
2660 | kfree(snap->name); |
2661 | kfree(snap); |
2662 | } |
2663 | |
2664 | static const struct attribute_group *rbd_snap_attr_groups[] = { |
2665 | &rbd_snap_attr_group, |
2666 | NULL |
2667 | }; |
2668 | |
2669 | static struct device_type rbd_snap_device_type = { |
2670 | .groups = rbd_snap_attr_groups, |
2671 | .release = rbd_snap_dev_release, |
2672 | }; |
2673 | |
2674 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
2675 | { |
2676 | kref_get(&spec->kref); |
2677 | |
2678 | return spec; |
2679 | } |
2680 | |
2681 | static void rbd_spec_free(struct kref *kref); |
2682 | static void rbd_spec_put(struct rbd_spec *spec) |
2683 | { |
2684 | if (spec) |
2685 | kref_put(&spec->kref, rbd_spec_free); |
2686 | } |
2687 | |
2688 | static struct rbd_spec *rbd_spec_alloc(void) |
2689 | { |
2690 | struct rbd_spec *spec; |
2691 | |
2692 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); |
2693 | if (!spec) |
2694 | return NULL; |
2695 | kref_init(&spec->kref); |
2696 | |
2697 | rbd_spec_put(rbd_spec_get(spec)); /* TEMPORARY */ |
2698 | |
2699 | return spec; |
2700 | } |
2701 | |
2702 | static void rbd_spec_free(struct kref *kref) |
2703 | { |
2704 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); |
2705 | |
2706 | kfree(spec->pool_name); |
2707 | kfree(spec->image_id); |
2708 | kfree(spec->image_name); |
2709 | kfree(spec->snap_name); |
2710 | kfree(spec); |
2711 | } |
2712 | |
2713 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
2714 | struct rbd_spec *spec) |
2715 | { |
2716 | struct rbd_device *rbd_dev; |
2717 | |
2718 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); |
2719 | if (!rbd_dev) |
2720 | return NULL; |
2721 | |
2722 | spin_lock_init(&rbd_dev->lock); |
2723 | rbd_dev->flags = 0; |
2724 | INIT_LIST_HEAD(&rbd_dev->node); |
2725 | INIT_LIST_HEAD(&rbd_dev->snaps); |
2726 | init_rwsem(&rbd_dev->header_rwsem); |
2727 | |
2728 | rbd_dev->spec = spec; |
2729 | rbd_dev->rbd_client = rbdc; |
2730 | |
2731 | /* Initialize the layout used for all rbd requests */ |
2732 | |
2733 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
2734 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); |
2735 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
2736 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); |
2737 | |
2738 | return rbd_dev; |
2739 | } |
2740 | |
2741 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
2742 | { |
2743 | rbd_spec_put(rbd_dev->parent_spec); |
2744 | kfree(rbd_dev->header_name); |
2745 | rbd_put_client(rbd_dev->rbd_client); |
2746 | rbd_spec_put(rbd_dev->spec); |
2747 | kfree(rbd_dev); |
2748 | } |
2749 | |
2750 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2751 | { |
2752 | bool ret = snap->dev.type == &rbd_snap_device_type; |
2753 | bool reg = device_is_registered(&snap->dev); |
2754 | |
2755 | rbd_assert(!ret ^ reg); |
2756 | |
2757 | return ret; |
2758 | } |
2759 | |
2760 | static void rbd_remove_snap_dev(struct rbd_snap *snap) |
2761 | { |
2762 | list_del(&snap->node); |
2763 | if (device_is_registered(&snap->dev)) |
2764 | device_unregister(&snap->dev); |
2765 | } |
2766 | |
2767 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
2768 | struct device *parent) |
2769 | { |
2770 | struct device *dev = &snap->dev; |
2771 | int ret; |
2772 | |
2773 | dev->type = &rbd_snap_device_type; |
2774 | dev->parent = parent; |
2775 | dev->release = rbd_snap_dev_release; |
2776 | dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); |
2777 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2778 | |
2779 | ret = device_register(dev); |
2780 | |
2781 | return ret; |
2782 | } |
2783 | |
2784 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
2785 | const char *snap_name, |
2786 | u64 snap_id, u64 snap_size, |
2787 | u64 snap_features) |
2788 | { |
2789 | struct rbd_snap *snap; |
2790 | int ret; |
2791 | |
2792 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); |
2793 | if (!snap) |
2794 | return ERR_PTR(-ENOMEM); |
2795 | |
2796 | ret = -ENOMEM; |
2797 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
2798 | if (!snap->name) |
2799 | goto err; |
2800 | |
2801 | snap->id = snap_id; |
2802 | snap->size = snap_size; |
2803 | snap->features = snap_features; |
2804 | |
2805 | return snap; |
2806 | |
2807 | err: |
2808 | kfree(snap->name); |
2809 | kfree(snap); |
2810 | |
2811 | return ERR_PTR(ret); |
2812 | } |
2813 | |
2814 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2815 | u64 *snap_size, u64 *snap_features) |
2816 | { |
2817 | char *snap_name; |
2818 | |
2819 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
2820 | |
2821 | *snap_size = rbd_dev->header.snap_sizes[which]; |
2822 | *snap_features = 0; /* No features for v1 */ |
2823 | |
2824 | /* Skip over names until we find the one we are looking for */ |
2825 | |
2826 | snap_name = rbd_dev->header.snap_names; |
2827 | while (which--) |
2828 | snap_name += strlen(snap_name) + 1; |
2829 | |
2830 | return snap_name; |
2831 | } |
2832 | |
2833 | /* |
2834 | * Get the size and object order for an image snapshot, or if |
2835 | * snap_id is CEPH_NOSNAP, gets this information for the base |
2836 | * image. |
2837 | */ |
2838 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
2839 | u8 *order, u64 *snap_size) |
2840 | { |
2841 | __le64 snapid = cpu_to_le64(snap_id); |
2842 | int ret; |
2843 | struct { |
2844 | u8 order; |
2845 | __le64 size; |
2846 | } __attribute__ ((packed)) size_buf = { 0 }; |
2847 | |
2848 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
2849 | "rbd", "get_size", |
2850 | (char *) &snapid, sizeof (snapid), |
2851 | (char *) &size_buf, sizeof (size_buf), NULL); |
2852 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
2853 | if (ret < 0) |
2854 | return ret; |
2855 | |
2856 | *order = size_buf.order; |
2857 | *snap_size = le64_to_cpu(size_buf.size); |
2858 | |
2859 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", |
2860 | (unsigned long long) snap_id, (unsigned int) *order, |
2861 | (unsigned long long) *snap_size); |
2862 | |
2863 | return 0; |
2864 | } |
2865 | |
2866 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) |
2867 | { |
2868 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, |
2869 | &rbd_dev->header.obj_order, |
2870 | &rbd_dev->header.image_size); |
2871 | } |
2872 | |
2873 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2874 | { |
2875 | void *reply_buf; |
2876 | int ret; |
2877 | void *p; |
2878 | |
2879 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); |
2880 | if (!reply_buf) |
2881 | return -ENOMEM; |
2882 | |
2883 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
2884 | "rbd", "get_object_prefix", |
2885 | NULL, 0, |
2886 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
2887 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
2888 | if (ret < 0) |
2889 | goto out; |
2890 | |
2891 | p = reply_buf; |
2892 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
2893 | p + RBD_OBJ_PREFIX_LEN_MAX, |
2894 | NULL, GFP_NOIO); |
2895 | |
2896 | if (IS_ERR(rbd_dev->header.object_prefix)) { |
2897 | ret = PTR_ERR(rbd_dev->header.object_prefix); |
2898 | rbd_dev->header.object_prefix = NULL; |
2899 | } else { |
2900 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); |
2901 | } |
2902 | |
2903 | out: |
2904 | kfree(reply_buf); |
2905 | |
2906 | return ret; |
2907 | } |
2908 | |
2909 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2910 | u64 *snap_features) |
2911 | { |
2912 | __le64 snapid = cpu_to_le64(snap_id); |
2913 | struct { |
2914 | __le64 features; |
2915 | __le64 incompat; |
2916 | } features_buf = { 0 }; |
2917 | u64 incompat; |
2918 | int ret; |
2919 | |
2920 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
2921 | "rbd", "get_features", |
2922 | (char *) &snapid, sizeof (snapid), |
2923 | (char *) &features_buf, sizeof (features_buf), |
2924 | NULL); |
2925 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
2926 | if (ret < 0) |
2927 | return ret; |
2928 | |
2929 | incompat = le64_to_cpu(features_buf.incompat); |
2930 | if (incompat & ~RBD_FEATURES_ALL) |
2931 | return -ENXIO; |
2932 | |
2933 | *snap_features = le64_to_cpu(features_buf.features); |
2934 | |
2935 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", |
2936 | (unsigned long long) snap_id, |
2937 | (unsigned long long) *snap_features, |
2938 | (unsigned long long) le64_to_cpu(features_buf.incompat)); |
2939 | |
2940 | return 0; |
2941 | } |
2942 | |
2943 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) |
2944 | { |
2945 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, |
2946 | &rbd_dev->header.features); |
2947 | } |
2948 | |
2949 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
2950 | { |
2951 | struct rbd_spec *parent_spec; |
2952 | size_t size; |
2953 | void *reply_buf = NULL; |
2954 | __le64 snapid; |
2955 | void *p; |
2956 | void *end; |
2957 | char *image_id; |
2958 | u64 overlap; |
2959 | int ret; |
2960 | |
2961 | parent_spec = rbd_spec_alloc(); |
2962 | if (!parent_spec) |
2963 | return -ENOMEM; |
2964 | |
2965 | size = sizeof (__le64) + /* pool_id */ |
2966 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ |
2967 | sizeof (__le64) + /* snap_id */ |
2968 | sizeof (__le64); /* overlap */ |
2969 | reply_buf = kmalloc(size, GFP_KERNEL); |
2970 | if (!reply_buf) { |
2971 | ret = -ENOMEM; |
2972 | goto out_err; |
2973 | } |
2974 | |
2975 | snapid = cpu_to_le64(CEPH_NOSNAP); |
2976 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
2977 | "rbd", "get_parent", |
2978 | (char *) &snapid, sizeof (snapid), |
2979 | (char *) reply_buf, size, NULL); |
2980 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
2981 | if (ret < 0) |
2982 | goto out_err; |
2983 | |
2984 | ret = -ERANGE; |
2985 | p = reply_buf; |
2986 | end = (char *) reply_buf + size; |
2987 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
2988 | if (parent_spec->pool_id == CEPH_NOPOOL) |
2989 | goto out; /* No parent? No problem. */ |
2990 | |
2991 | /* The ceph file layout needs to fit pool id in 32 bits */ |
2992 | |
2993 | ret = -EIO; |
2994 | if (WARN_ON(parent_spec->pool_id > (u64) U32_MAX)) |
2995 | goto out; |
2996 | |
2997 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
2998 | if (IS_ERR(image_id)) { |
2999 | ret = PTR_ERR(image_id); |
3000 | goto out_err; |
3001 | } |
3002 | parent_spec->image_id = image_id; |
3003 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); |
3004 | ceph_decode_64_safe(&p, end, overlap, out_err); |
3005 | |
3006 | rbd_dev->parent_overlap = overlap; |
3007 | rbd_dev->parent_spec = parent_spec; |
3008 | parent_spec = NULL; /* rbd_dev now owns this */ |
3009 | out: |
3010 | ret = 0; |
3011 | out_err: |
3012 | kfree(reply_buf); |
3013 | rbd_spec_put(parent_spec); |
3014 | |
3015 | return ret; |
3016 | } |
3017 | |
3018 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3019 | { |
3020 | size_t image_id_size; |
3021 | char *image_id; |
3022 | void *p; |
3023 | void *end; |
3024 | size_t size; |
3025 | void *reply_buf = NULL; |
3026 | size_t len = 0; |
3027 | char *image_name = NULL; |
3028 | int ret; |
3029 | |
3030 | rbd_assert(!rbd_dev->spec->image_name); |
3031 | |
3032 | len = strlen(rbd_dev->spec->image_id); |
3033 | image_id_size = sizeof (__le32) + len; |
3034 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3035 | if (!image_id) |
3036 | return NULL; |
3037 | |
3038 | p = image_id; |
3039 | end = (char *) image_id + image_id_size; |
3040 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len); |
3041 | |
3042 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; |
3043 | reply_buf = kmalloc(size, GFP_KERNEL); |
3044 | if (!reply_buf) |
3045 | goto out; |
3046 | |
3047 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
3048 | "rbd", "dir_get_name", |
3049 | image_id, image_id_size, |
3050 | (char *) reply_buf, size, NULL); |
3051 | if (ret < 0) |
3052 | goto out; |
3053 | p = reply_buf; |
3054 | end = (char *) reply_buf + size; |
3055 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3056 | if (IS_ERR(image_name)) |
3057 | image_name = NULL; |
3058 | else |
3059 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); |
3060 | out: |
3061 | kfree(reply_buf); |
3062 | kfree(image_id); |
3063 | |
3064 | return image_name; |
3065 | } |
3066 | |
3067 | /* |
3068 | * When a parent image gets probed, we only have the pool, image, |
3069 | * and snapshot ids but not the names of any of them. This call |
3070 | * is made later to fill in those names. It has to be done after |
3071 | * rbd_dev_snaps_update() has completed because some of the |
3072 | * information (in particular, snapshot name) is not available |
3073 | * until then. |
3074 | */ |
3075 | static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) |
3076 | { |
3077 | struct ceph_osd_client *osdc; |
3078 | const char *name; |
3079 | void *reply_buf = NULL; |
3080 | int ret; |
3081 | |
3082 | if (rbd_dev->spec->pool_name) |
3083 | return 0; /* Already have the names */ |
3084 | |
3085 | /* Look up the pool name */ |
3086 | |
3087 | osdc = &rbd_dev->rbd_client->client->osdc; |
3088 | name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); |
3089 | if (!name) { |
3090 | rbd_warn(rbd_dev, "there is no pool with id %llu", |
3091 | rbd_dev->spec->pool_id); /* Really a BUG() */ |
3092 | return -EIO; |
3093 | } |
3094 | |
3095 | rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); |
3096 | if (!rbd_dev->spec->pool_name) |
3097 | return -ENOMEM; |
3098 | |
3099 | /* Fetch the image name; tolerate failure here */ |
3100 | |
3101 | name = rbd_dev_image_name(rbd_dev); |
3102 | if (name) |
3103 | rbd_dev->spec->image_name = (char *) name; |
3104 | else |
3105 | rbd_warn(rbd_dev, "unable to get image name"); |
3106 | |
3107 | /* Look up the snapshot name. */ |
3108 | |
3109 | name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); |
3110 | if (!name) { |
3111 | rbd_warn(rbd_dev, "no snapshot with id %llu", |
3112 | rbd_dev->spec->snap_id); /* Really a BUG() */ |
3113 | ret = -EIO; |
3114 | goto out_err; |
3115 | } |
3116 | rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); |
3117 | if(!rbd_dev->spec->snap_name) |
3118 | goto out_err; |
3119 | |
3120 | return 0; |
3121 | out_err: |
3122 | kfree(reply_buf); |
3123 | kfree(rbd_dev->spec->pool_name); |
3124 | rbd_dev->spec->pool_name = NULL; |
3125 | |
3126 | return ret; |
3127 | } |
3128 | |
3129 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
3130 | { |
3131 | size_t size; |
3132 | int ret; |
3133 | void *reply_buf; |
3134 | void *p; |
3135 | void *end; |
3136 | u64 seq; |
3137 | u32 snap_count; |
3138 | struct ceph_snap_context *snapc; |
3139 | u32 i; |
3140 | |
3141 | /* |
3142 | * We'll need room for the seq value (maximum snapshot id), |
3143 | * snapshot count, and array of that many snapshot ids. |
3144 | * For now we have a fixed upper limit on the number we're |
3145 | * prepared to receive. |
3146 | */ |
3147 | size = sizeof (__le64) + sizeof (__le32) + |
3148 | RBD_MAX_SNAP_COUNT * sizeof (__le64); |
3149 | reply_buf = kzalloc(size, GFP_KERNEL); |
3150 | if (!reply_buf) |
3151 | return -ENOMEM; |
3152 | |
3153 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
3154 | "rbd", "get_snapcontext", |
3155 | NULL, 0, |
3156 | reply_buf, size, ver); |
3157 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3158 | if (ret < 0) |
3159 | goto out; |
3160 | |
3161 | ret = -ERANGE; |
3162 | p = reply_buf; |
3163 | end = (char *) reply_buf + size; |
3164 | ceph_decode_64_safe(&p, end, seq, out); |
3165 | ceph_decode_32_safe(&p, end, snap_count, out); |
3166 | |
3167 | /* |
3168 | * Make sure the reported number of snapshot ids wouldn't go |
3169 | * beyond the end of our buffer. But before checking that, |
3170 | * make sure the computed size of the snapshot context we |
3171 | * allocate is representable in a size_t. |
3172 | */ |
3173 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) |
3174 | / sizeof (u64)) { |
3175 | ret = -EINVAL; |
3176 | goto out; |
3177 | } |
3178 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) |
3179 | goto out; |
3180 | |
3181 | size = sizeof (struct ceph_snap_context) + |
3182 | snap_count * sizeof (snapc->snaps[0]); |
3183 | snapc = kmalloc(size, GFP_KERNEL); |
3184 | if (!snapc) { |
3185 | ret = -ENOMEM; |
3186 | goto out; |
3187 | } |
3188 | |
3189 | atomic_set(&snapc->nref, 1); |
3190 | snapc->seq = seq; |
3191 | snapc->num_snaps = snap_count; |
3192 | for (i = 0; i < snap_count; i++) |
3193 | snapc->snaps[i] = ceph_decode_64(&p); |
3194 | |
3195 | rbd_dev->header.snapc = snapc; |
3196 | |
3197 | dout(" snap context seq = %llu, snap_count = %u\n", |
3198 | (unsigned long long) seq, (unsigned int) snap_count); |
3199 | |
3200 | out: |
3201 | kfree(reply_buf); |
3202 | |
3203 | return 0; |
3204 | } |
3205 | |
3206 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
3207 | { |
3208 | size_t size; |
3209 | void *reply_buf; |
3210 | __le64 snap_id; |
3211 | int ret; |
3212 | void *p; |
3213 | void *end; |
3214 | char *snap_name; |
3215 | |
3216 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; |
3217 | reply_buf = kmalloc(size, GFP_KERNEL); |
3218 | if (!reply_buf) |
3219 | return ERR_PTR(-ENOMEM); |
3220 | |
3221 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); |
3222 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
3223 | "rbd", "get_snapshot_name", |
3224 | (char *) &snap_id, sizeof (snap_id), |
3225 | reply_buf, size, NULL); |
3226 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3227 | if (ret < 0) |
3228 | goto out; |
3229 | |
3230 | p = reply_buf; |
3231 | end = (char *) reply_buf + size; |
3232 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
3233 | if (IS_ERR(snap_name)) { |
3234 | ret = PTR_ERR(snap_name); |
3235 | goto out; |
3236 | } else { |
3237 | dout(" snap_id 0x%016llx snap_name = %s\n", |
3238 | (unsigned long long) le64_to_cpu(snap_id), snap_name); |
3239 | } |
3240 | kfree(reply_buf); |
3241 | |
3242 | return snap_name; |
3243 | out: |
3244 | kfree(reply_buf); |
3245 | |
3246 | return ERR_PTR(ret); |
3247 | } |
3248 | |
3249 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, |
3250 | u64 *snap_size, u64 *snap_features) |
3251 | { |
3252 | u64 snap_id; |
3253 | u8 order; |
3254 | int ret; |
3255 | |
3256 | snap_id = rbd_dev->header.snapc->snaps[which]; |
3257 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); |
3258 | if (ret) |
3259 | return ERR_PTR(ret); |
3260 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); |
3261 | if (ret) |
3262 | return ERR_PTR(ret); |
3263 | |
3264 | return rbd_dev_v2_snap_name(rbd_dev, which); |
3265 | } |
3266 | |
3267 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, |
3268 | u64 *snap_size, u64 *snap_features) |
3269 | { |
3270 | if (rbd_dev->image_format == 1) |
3271 | return rbd_dev_v1_snap_info(rbd_dev, which, |
3272 | snap_size, snap_features); |
3273 | if (rbd_dev->image_format == 2) |
3274 | return rbd_dev_v2_snap_info(rbd_dev, which, |
3275 | snap_size, snap_features); |
3276 | return ERR_PTR(-EINVAL); |
3277 | } |
3278 | |
3279 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
3280 | { |
3281 | int ret; |
3282 | __u8 obj_order; |
3283 | |
3284 | down_write(&rbd_dev->header_rwsem); |
3285 | |
3286 | /* Grab old order first, to see if it changes */ |
3287 | |
3288 | obj_order = rbd_dev->header.obj_order, |
3289 | ret = rbd_dev_v2_image_size(rbd_dev); |
3290 | if (ret) |
3291 | goto out; |
3292 | if (rbd_dev->header.obj_order != obj_order) { |
3293 | ret = -EIO; |
3294 | goto out; |
3295 | } |
3296 | rbd_update_mapping_size(rbd_dev); |
3297 | |
3298 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); |
3299 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
3300 | if (ret) |
3301 | goto out; |
3302 | ret = rbd_dev_snaps_update(rbd_dev); |
3303 | dout("rbd_dev_snaps_update returned %d\n", ret); |
3304 | if (ret) |
3305 | goto out; |
3306 | ret = rbd_dev_snaps_register(rbd_dev); |
3307 | dout("rbd_dev_snaps_register returned %d\n", ret); |
3308 | out: |
3309 | up_write(&rbd_dev->header_rwsem); |
3310 | |
3311 | return ret; |
3312 | } |
3313 | |
3314 | /* |
3315 | * Scan the rbd device's current snapshot list and compare it to the |
3316 | * newly-received snapshot context. Remove any existing snapshots |
3317 | * not present in the new snapshot context. Add a new snapshot for |
3318 | * any snaphots in the snapshot context not in the current list. |
3319 | * And verify there are no changes to snapshots we already know |
3320 | * about. |
3321 | * |
3322 | * Assumes the snapshots in the snapshot context are sorted by |
3323 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list |
3324 | * are also maintained in that order.) |
3325 | */ |
3326 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
3327 | { |
3328 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
3329 | const u32 snap_count = snapc->num_snaps; |
3330 | struct list_head *head = &rbd_dev->snaps; |
3331 | struct list_head *links = head->next; |
3332 | u32 index = 0; |
3333 | |
3334 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
3335 | while (index < snap_count || links != head) { |
3336 | u64 snap_id; |
3337 | struct rbd_snap *snap; |
3338 | char *snap_name; |
3339 | u64 snap_size = 0; |
3340 | u64 snap_features = 0; |
3341 | |
3342 | snap_id = index < snap_count ? snapc->snaps[index] |
3343 | : CEPH_NOSNAP; |
3344 | snap = links != head ? list_entry(links, struct rbd_snap, node) |
3345 | : NULL; |
3346 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
3347 | |
3348 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
3349 | struct list_head *next = links->next; |
3350 | |
3351 | /* |
3352 | * A previously-existing snapshot is not in |
3353 | * the new snap context. |
3354 | * |
3355 | * If the now missing snapshot is the one the |
3356 | * image is mapped to, clear its exists flag |
3357 | * so we can avoid sending any more requests |
3358 | * to it. |
3359 | */ |
3360 | if (rbd_dev->spec->snap_id == snap->id) |
3361 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
3362 | rbd_remove_snap_dev(snap); |
3363 | dout("%ssnap id %llu has been removed\n", |
3364 | rbd_dev->spec->snap_id == snap->id ? |
3365 | "mapped " : "", |
3366 | (unsigned long long) snap->id); |
3367 | |
3368 | /* Done with this list entry; advance */ |
3369 | |
3370 | links = next; |
3371 | continue; |
3372 | } |
3373 | |
3374 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
3375 | &snap_size, &snap_features); |
3376 | if (IS_ERR(snap_name)) |
3377 | return PTR_ERR(snap_name); |
3378 | |
3379 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
3380 | (unsigned long long) snap_id); |
3381 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
3382 | struct rbd_snap *new_snap; |
3383 | |
3384 | /* We haven't seen this snapshot before */ |
3385 | |
3386 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
3387 | snap_id, snap_size, snap_features); |
3388 | if (IS_ERR(new_snap)) { |
3389 | int err = PTR_ERR(new_snap); |
3390 | |
3391 | dout(" failed to add dev, error %d\n", err); |
3392 | |
3393 | return err; |
3394 | } |
3395 | |
3396 | /* New goes before existing, or at end of list */ |
3397 | |
3398 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
3399 | if (snap) |
3400 | list_add_tail(&new_snap->node, &snap->node); |
3401 | else |
3402 | list_add_tail(&new_snap->node, head); |
3403 | } else { |
3404 | /* Already have this one */ |
3405 | |
3406 | dout(" already present\n"); |
3407 | |
3408 | rbd_assert(snap->size == snap_size); |
3409 | rbd_assert(!strcmp(snap->name, snap_name)); |
3410 | rbd_assert(snap->features == snap_features); |
3411 | |
3412 | /* Done with this list entry; advance */ |
3413 | |
3414 | links = links->next; |
3415 | } |
3416 | |
3417 | /* Advance to the next entry in the snapshot context */ |
3418 | |
3419 | index++; |
3420 | } |
3421 | dout("%s: done\n", __func__); |
3422 | |
3423 | return 0; |
3424 | } |
3425 | |
3426 | /* |
3427 | * Scan the list of snapshots and register the devices for any that |
3428 | * have not already been registered. |
3429 | */ |
3430 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) |
3431 | { |
3432 | struct rbd_snap *snap; |
3433 | int ret = 0; |
3434 | |
3435 | dout("%s:\n", __func__); |
3436 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
3437 | return -EIO; |
3438 | |
3439 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
3440 | if (!rbd_snap_registered(snap)) { |
3441 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
3442 | if (ret < 0) |
3443 | break; |
3444 | } |
3445 | } |
3446 | dout("%s: returning %d\n", __func__, ret); |
3447 | |
3448 | return ret; |
3449 | } |
3450 | |
3451 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
3452 | { |
3453 | struct device *dev; |
3454 | int ret; |
3455 | |
3456 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
3457 | |
3458 | dev = &rbd_dev->dev; |
3459 | dev->bus = &rbd_bus_type; |
3460 | dev->type = &rbd_device_type; |
3461 | dev->parent = &rbd_root_dev; |
3462 | dev->release = rbd_dev_release; |
3463 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
3464 | ret = device_register(dev); |
3465 | |
3466 | mutex_unlock(&ctl_mutex); |
3467 | |
3468 | return ret; |
3469 | } |
3470 | |
3471 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
3472 | { |
3473 | device_unregister(&rbd_dev->dev); |
3474 | } |
3475 | |
3476 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
3477 | |
3478 | /* |
3479 | * Get a unique rbd identifier for the given new rbd_dev, and add |
3480 | * the rbd_dev to the global list. The minimum rbd id is 1. |
3481 | */ |
3482 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
3483 | { |
3484 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
3485 | |
3486 | spin_lock(&rbd_dev_list_lock); |
3487 | list_add_tail(&rbd_dev->node, &rbd_dev_list); |
3488 | spin_unlock(&rbd_dev_list_lock); |
3489 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
3490 | (unsigned long long) rbd_dev->dev_id); |
3491 | } |
3492 | |
3493 | /* |
3494 | * Remove an rbd_dev from the global list, and record that its |
3495 | * identifier is no longer in use. |
3496 | */ |
3497 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
3498 | { |
3499 | struct list_head *tmp; |
3500 | int rbd_id = rbd_dev->dev_id; |
3501 | int max_id; |
3502 | |
3503 | rbd_assert(rbd_id > 0); |
3504 | |
3505 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
3506 | (unsigned long long) rbd_dev->dev_id); |
3507 | spin_lock(&rbd_dev_list_lock); |
3508 | list_del_init(&rbd_dev->node); |
3509 | |
3510 | /* |
3511 | * If the id being "put" is not the current maximum, there |
3512 | * is nothing special we need to do. |
3513 | */ |
3514 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
3515 | spin_unlock(&rbd_dev_list_lock); |
3516 | return; |
3517 | } |
3518 | |
3519 | /* |
3520 | * We need to update the current maximum id. Search the |
3521 | * list to find out what it is. We're more likely to find |
3522 | * the maximum at the end, so search the list backward. |
3523 | */ |
3524 | max_id = 0; |
3525 | list_for_each_prev(tmp, &rbd_dev_list) { |
3526 | struct rbd_device *rbd_dev; |
3527 | |
3528 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
3529 | if (rbd_dev->dev_id > max_id) |
3530 | max_id = rbd_dev->dev_id; |
3531 | } |
3532 | spin_unlock(&rbd_dev_list_lock); |
3533 | |
3534 | /* |
3535 | * The max id could have been updated by rbd_dev_id_get(), in |
3536 | * which case it now accurately reflects the new maximum. |
3537 | * Be careful not to overwrite the maximum value in that |
3538 | * case. |
3539 | */ |
3540 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
3541 | dout(" max dev id has been reset\n"); |
3542 | } |
3543 | |
3544 | /* |
3545 | * Skips over white space at *buf, and updates *buf to point to the |
3546 | * first found non-space character (if any). Returns the length of |
3547 | * the token (string of non-white space characters) found. Note |
3548 | * that *buf must be terminated with '\0'. |
3549 | */ |
3550 | static inline size_t next_token(const char **buf) |
3551 | { |
3552 | /* |
3553 | * These are the characters that produce nonzero for |
3554 | * isspace() in the "C" and "POSIX" locales. |
3555 | */ |
3556 | const char *spaces = " \f\n\r\t\v"; |
3557 | |
3558 | *buf += strspn(*buf, spaces); /* Find start of token */ |
3559 | |
3560 | return strcspn(*buf, spaces); /* Return token length */ |
3561 | } |
3562 | |
3563 | /* |
3564 | * Finds the next token in *buf, and if the provided token buffer is |
3565 | * big enough, copies the found token into it. The result, if |
3566 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
3567 | * must be terminated with '\0' on entry. |
3568 | * |
3569 | * Returns the length of the token found (not including the '\0'). |
3570 | * Return value will be 0 if no token is found, and it will be >= |
3571 | * token_size if the token would not fit. |
3572 | * |
3573 | * The *buf pointer will be updated to point beyond the end of the |
3574 | * found token. Note that this occurs even if the token buffer is |
3575 | * too small to hold it. |
3576 | */ |
3577 | static inline size_t copy_token(const char **buf, |
3578 | char *token, |
3579 | size_t token_size) |
3580 | { |
3581 | size_t len; |
3582 | |
3583 | len = next_token(buf); |
3584 | if (len < token_size) { |
3585 | memcpy(token, *buf, len); |
3586 | *(token + len) = '\0'; |
3587 | } |
3588 | *buf += len; |
3589 | |
3590 | return len; |
3591 | } |
3592 | |
3593 | /* |
3594 | * Finds the next token in *buf, dynamically allocates a buffer big |
3595 | * enough to hold a copy of it, and copies the token into the new |
3596 | * buffer. The copy is guaranteed to be terminated with '\0'. Note |
3597 | * that a duplicate buffer is created even for a zero-length token. |
3598 | * |
3599 | * Returns a pointer to the newly-allocated duplicate, or a null |
3600 | * pointer if memory for the duplicate was not available. If |
3601 | * the lenp argument is a non-null pointer, the length of the token |
3602 | * (not including the '\0') is returned in *lenp. |
3603 | * |
3604 | * If successful, the *buf pointer will be updated to point beyond |
3605 | * the end of the found token. |
3606 | * |
3607 | * Note: uses GFP_KERNEL for allocation. |
3608 | */ |
3609 | static inline char *dup_token(const char **buf, size_t *lenp) |
3610 | { |
3611 | char *dup; |
3612 | size_t len; |
3613 | |
3614 | len = next_token(buf); |
3615 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
3616 | if (!dup) |
3617 | return NULL; |
3618 | *(dup + len) = '\0'; |
3619 | *buf += len; |
3620 | |
3621 | if (lenp) |
3622 | *lenp = len; |
3623 | |
3624 | return dup; |
3625 | } |
3626 | |
3627 | /* |
3628 | * Parse the options provided for an "rbd add" (i.e., rbd image |
3629 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, |
3630 | * and the data written is passed here via a NUL-terminated buffer. |
3631 | * Returns 0 if successful or an error code otherwise. |
3632 | * |
3633 | * The information extracted from these options is recorded in |
3634 | * the other parameters which return dynamically-allocated |
3635 | * structures: |
3636 | * ceph_opts |
3637 | * The address of a pointer that will refer to a ceph options |
3638 | * structure. Caller must release the returned pointer using |
3639 | * ceph_destroy_options() when it is no longer needed. |
3640 | * rbd_opts |
3641 | * Address of an rbd options pointer. Fully initialized by |
3642 | * this function; caller must release with kfree(). |
3643 | * spec |
3644 | * Address of an rbd image specification pointer. Fully |
3645 | * initialized by this function based on parsed options. |
3646 | * Caller must release with rbd_spec_put(). |
3647 | * |
3648 | * The options passed take this form: |
3649 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] |
3650 | * where: |
3651 | * <mon_addrs> |
3652 | * A comma-separated list of one or more monitor addresses. |
3653 | * A monitor address is an ip address, optionally followed |
3654 | * by a port number (separated by a colon). |
3655 | * I.e.: ip1[:port1][,ip2[:port2]...] |
3656 | * <options> |
3657 | * A comma-separated list of ceph and/or rbd options. |
3658 | * <pool_name> |
3659 | * The name of the rados pool containing the rbd image. |
3660 | * <image_name> |
3661 | * The name of the image in that pool to map. |
3662 | * <snap_id> |
3663 | * An optional snapshot id. If provided, the mapping will |
3664 | * present data from the image at the time that snapshot was |
3665 | * created. The image head is used if no snapshot id is |
3666 | * provided. Snapshot mappings are always read-only. |
3667 | */ |
3668 | static int rbd_add_parse_args(const char *buf, |
3669 | struct ceph_options **ceph_opts, |
3670 | struct rbd_options **opts, |
3671 | struct rbd_spec **rbd_spec) |
3672 | { |
3673 | size_t len; |
3674 | char *options; |
3675 | const char *mon_addrs; |
3676 | size_t mon_addrs_size; |
3677 | struct rbd_spec *spec = NULL; |
3678 | struct rbd_options *rbd_opts = NULL; |
3679 | struct ceph_options *copts; |
3680 | int ret; |
3681 | |
3682 | /* The first four tokens are required */ |
3683 | |
3684 | len = next_token(&buf); |
3685 | if (!len) { |
3686 | rbd_warn(NULL, "no monitor address(es) provided"); |
3687 | return -EINVAL; |
3688 | } |
3689 | mon_addrs = buf; |
3690 | mon_addrs_size = len + 1; |
3691 | buf += len; |
3692 | |
3693 | ret = -EINVAL; |
3694 | options = dup_token(&buf, NULL); |
3695 | if (!options) |
3696 | return -ENOMEM; |
3697 | if (!*options) { |
3698 | rbd_warn(NULL, "no options provided"); |
3699 | goto out_err; |
3700 | } |
3701 | |
3702 | spec = rbd_spec_alloc(); |
3703 | if (!spec) |
3704 | goto out_mem; |
3705 | |
3706 | spec->pool_name = dup_token(&buf, NULL); |
3707 | if (!spec->pool_name) |
3708 | goto out_mem; |
3709 | if (!*spec->pool_name) { |
3710 | rbd_warn(NULL, "no pool name provided"); |
3711 | goto out_err; |
3712 | } |
3713 | |
3714 | spec->image_name = dup_token(&buf, NULL); |
3715 | if (!spec->image_name) |
3716 | goto out_mem; |
3717 | if (!*spec->image_name) { |
3718 | rbd_warn(NULL, "no image name provided"); |
3719 | goto out_err; |
3720 | } |
3721 | |
3722 | /* |
3723 | * Snapshot name is optional; default is to use "-" |
3724 | * (indicating the head/no snapshot). |
3725 | */ |
3726 | len = next_token(&buf); |
3727 | if (!len) { |
3728 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
3729 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; |
3730 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
3731 | ret = -ENAMETOOLONG; |
3732 | goto out_err; |
3733 | } |
3734 | spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
3735 | if (!spec->snap_name) |
3736 | goto out_mem; |
3737 | *(spec->snap_name + len) = '\0'; |
3738 | |
3739 | /* Initialize all rbd options to the defaults */ |
3740 | |
3741 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
3742 | if (!rbd_opts) |
3743 | goto out_mem; |
3744 | |
3745 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
3746 | |
3747 | copts = ceph_parse_options(options, mon_addrs, |
3748 | mon_addrs + mon_addrs_size - 1, |
3749 | parse_rbd_opts_token, rbd_opts); |
3750 | if (IS_ERR(copts)) { |
3751 | ret = PTR_ERR(copts); |
3752 | goto out_err; |
3753 | } |
3754 | kfree(options); |
3755 | |
3756 | *ceph_opts = copts; |
3757 | *opts = rbd_opts; |
3758 | *rbd_spec = spec; |
3759 | |
3760 | return 0; |
3761 | out_mem: |
3762 | ret = -ENOMEM; |
3763 | out_err: |
3764 | kfree(rbd_opts); |
3765 | rbd_spec_put(spec); |
3766 | kfree(options); |
3767 | |
3768 | return ret; |
3769 | } |
3770 | |
3771 | /* |
3772 | * An rbd format 2 image has a unique identifier, distinct from the |
3773 | * name given to it by the user. Internally, that identifier is |
3774 | * what's used to specify the names of objects related to the image. |
3775 | * |
3776 | * A special "rbd id" object is used to map an rbd image name to its |
3777 | * id. If that object doesn't exist, then there is no v2 rbd image |
3778 | * with the supplied name. |
3779 | * |
3780 | * This function will record the given rbd_dev's image_id field if |
3781 | * it can be determined, and in that case will return 0. If any |
3782 | * errors occur a negative errno will be returned and the rbd_dev's |
3783 | * image_id field will be unchanged (and should be NULL). |
3784 | */ |
3785 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) |
3786 | { |
3787 | int ret; |
3788 | size_t size; |
3789 | char *object_name; |
3790 | void *response; |
3791 | void *p; |
3792 | |
3793 | /* |
3794 | * When probing a parent image, the image id is already |
3795 | * known (and the image name likely is not). There's no |
3796 | * need to fetch the image id again in this case. |
3797 | */ |
3798 | if (rbd_dev->spec->image_id) |
3799 | return 0; |
3800 | |
3801 | /* |
3802 | * First, see if the format 2 image id file exists, and if |
3803 | * so, get the image's persistent id from it. |
3804 | */ |
3805 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
3806 | object_name = kmalloc(size, GFP_NOIO); |
3807 | if (!object_name) |
3808 | return -ENOMEM; |
3809 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
3810 | dout("rbd id object name is %s\n", object_name); |
3811 | |
3812 | /* Response will be an encoded string, which includes a length */ |
3813 | |
3814 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
3815 | response = kzalloc(size, GFP_NOIO); |
3816 | if (!response) { |
3817 | ret = -ENOMEM; |
3818 | goto out; |
3819 | } |
3820 | |
3821 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
3822 | "rbd", "get_id", |
3823 | NULL, 0, |
3824 | response, RBD_IMAGE_ID_LEN_MAX, NULL); |
3825 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3826 | if (ret < 0) |
3827 | goto out; |
3828 | |
3829 | p = response; |
3830 | rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, |
3831 | p + RBD_IMAGE_ID_LEN_MAX, |
3832 | NULL, GFP_NOIO); |
3833 | if (IS_ERR(rbd_dev->spec->image_id)) { |
3834 | ret = PTR_ERR(rbd_dev->spec->image_id); |
3835 | rbd_dev->spec->image_id = NULL; |
3836 | } else { |
3837 | dout("image_id is %s\n", rbd_dev->spec->image_id); |
3838 | } |
3839 | out: |
3840 | kfree(response); |
3841 | kfree(object_name); |
3842 | |
3843 | return ret; |
3844 | } |
3845 | |
3846 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
3847 | { |
3848 | int ret; |
3849 | size_t size; |
3850 | |
3851 | /* Version 1 images have no id; empty string is used */ |
3852 | |
3853 | rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); |
3854 | if (!rbd_dev->spec->image_id) |
3855 | return -ENOMEM; |
3856 | |
3857 | /* Record the header object name for this rbd image. */ |
3858 | |
3859 | size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); |
3860 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
3861 | if (!rbd_dev->header_name) { |
3862 | ret = -ENOMEM; |
3863 | goto out_err; |
3864 | } |
3865 | sprintf(rbd_dev->header_name, "%s%s", |
3866 | rbd_dev->spec->image_name, RBD_SUFFIX); |
3867 | |
3868 | /* Populate rbd image metadata */ |
3869 | |
3870 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); |
3871 | if (ret < 0) |
3872 | goto out_err; |
3873 | |
3874 | /* Version 1 images have no parent (no layering) */ |
3875 | |
3876 | rbd_dev->parent_spec = NULL; |
3877 | rbd_dev->parent_overlap = 0; |
3878 | |
3879 | rbd_dev->image_format = 1; |
3880 | |
3881 | dout("discovered version 1 image, header name is %s\n", |
3882 | rbd_dev->header_name); |
3883 | |
3884 | return 0; |
3885 | |
3886 | out_err: |
3887 | kfree(rbd_dev->header_name); |
3888 | rbd_dev->header_name = NULL; |
3889 | kfree(rbd_dev->spec->image_id); |
3890 | rbd_dev->spec->image_id = NULL; |
3891 | |
3892 | return ret; |
3893 | } |
3894 | |
3895 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) |
3896 | { |
3897 | size_t size; |
3898 | int ret; |
3899 | u64 ver = 0; |
3900 | |
3901 | /* |
3902 | * Image id was filled in by the caller. Record the header |
3903 | * object name for this rbd image. |
3904 | */ |
3905 | size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); |
3906 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
3907 | if (!rbd_dev->header_name) |
3908 | return -ENOMEM; |
3909 | sprintf(rbd_dev->header_name, "%s%s", |
3910 | RBD_HEADER_PREFIX, rbd_dev->spec->image_id); |
3911 | |
3912 | /* Get the size and object order for the image */ |
3913 | |
3914 | ret = rbd_dev_v2_image_size(rbd_dev); |
3915 | if (ret < 0) |
3916 | goto out_err; |
3917 | |
3918 | /* Get the object prefix (a.k.a. block_name) for the image */ |
3919 | |
3920 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
3921 | if (ret < 0) |
3922 | goto out_err; |
3923 | |
3924 | /* Get the and check features for the image */ |
3925 | |
3926 | ret = rbd_dev_v2_features(rbd_dev); |
3927 | if (ret < 0) |
3928 | goto out_err; |
3929 | |
3930 | /* If the image supports layering, get the parent info */ |
3931 | |
3932 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
3933 | ret = rbd_dev_v2_parent_info(rbd_dev); |
3934 | if (ret < 0) |
3935 | goto out_err; |
3936 | } |
3937 | |
3938 | /* crypto and compression type aren't (yet) supported for v2 images */ |
3939 | |
3940 | rbd_dev->header.crypt_type = 0; |
3941 | rbd_dev->header.comp_type = 0; |
3942 | |
3943 | /* Get the snapshot context, plus the header version */ |
3944 | |
3945 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); |
3946 | if (ret) |
3947 | goto out_err; |
3948 | rbd_dev->header.obj_version = ver; |
3949 | |
3950 | rbd_dev->image_format = 2; |
3951 | |
3952 | dout("discovered version 2 image, header name is %s\n", |
3953 | rbd_dev->header_name); |
3954 | |
3955 | return 0; |
3956 | out_err: |
3957 | rbd_dev->parent_overlap = 0; |
3958 | rbd_spec_put(rbd_dev->parent_spec); |
3959 | rbd_dev->parent_spec = NULL; |
3960 | kfree(rbd_dev->header_name); |
3961 | rbd_dev->header_name = NULL; |
3962 | kfree(rbd_dev->header.object_prefix); |
3963 | rbd_dev->header.object_prefix = NULL; |
3964 | |
3965 | return ret; |
3966 | } |
3967 | |
3968 | static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) |
3969 | { |
3970 | int ret; |
3971 | |
3972 | /* no need to lock here, as rbd_dev is not registered yet */ |
3973 | ret = rbd_dev_snaps_update(rbd_dev); |
3974 | if (ret) |
3975 | return ret; |
3976 | |
3977 | ret = rbd_dev_probe_update_spec(rbd_dev); |
3978 | if (ret) |
3979 | goto err_out_snaps; |
3980 | |
3981 | ret = rbd_dev_set_mapping(rbd_dev); |
3982 | if (ret) |
3983 | goto err_out_snaps; |
3984 | |
3985 | /* generate unique id: find highest unique id, add one */ |
3986 | rbd_dev_id_get(rbd_dev); |
3987 | |
3988 | /* Fill in the device name, now that we have its id. */ |
3989 | BUILD_BUG_ON(DEV_NAME_LEN |
3990 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); |
3991 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
3992 | |
3993 | /* Get our block major device number. */ |
3994 | |
3995 | ret = register_blkdev(0, rbd_dev->name); |
3996 | if (ret < 0) |
3997 | goto err_out_id; |
3998 | rbd_dev->major = ret; |
3999 | |
4000 | /* Set up the blkdev mapping. */ |
4001 | |
4002 | ret = rbd_init_disk(rbd_dev); |
4003 | if (ret) |
4004 | goto err_out_blkdev; |
4005 | |
4006 | ret = rbd_bus_add_dev(rbd_dev); |
4007 | if (ret) |
4008 | goto err_out_disk; |
4009 | |
4010 | /* |
4011 | * At this point cleanup in the event of an error is the job |
4012 | * of the sysfs code (initiated by rbd_bus_del_dev()). |
4013 | */ |
4014 | down_write(&rbd_dev->header_rwsem); |
4015 | ret = rbd_dev_snaps_register(rbd_dev); |
4016 | up_write(&rbd_dev->header_rwsem); |
4017 | if (ret) |
4018 | goto err_out_bus; |
4019 | |
4020 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
4021 | if (ret) |
4022 | goto err_out_bus; |
4023 | |
4024 | /* Everything's ready. Announce the disk to the world. */ |
4025 | |
4026 | add_disk(rbd_dev->disk); |
4027 | |
4028 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
4029 | (unsigned long long) rbd_dev->mapping.size); |
4030 | |
4031 | return ret; |
4032 | err_out_bus: |
4033 | /* this will also clean up rest of rbd_dev stuff */ |
4034 | |
4035 | rbd_bus_del_dev(rbd_dev); |
4036 | |
4037 | return ret; |
4038 | err_out_disk: |
4039 | rbd_free_disk(rbd_dev); |
4040 | err_out_blkdev: |
4041 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
4042 | err_out_id: |
4043 | rbd_dev_id_put(rbd_dev); |
4044 | err_out_snaps: |
4045 | rbd_remove_all_snaps(rbd_dev); |
4046 | |
4047 | return ret; |
4048 | } |
4049 | |
4050 | /* |
4051 | * Probe for the existence of the header object for the given rbd |
4052 | * device. For format 2 images this includes determining the image |
4053 | * id. |
4054 | */ |
4055 | static int rbd_dev_probe(struct rbd_device *rbd_dev) |
4056 | { |
4057 | int ret; |
4058 | |
4059 | /* |
4060 | * Get the id from the image id object. If it's not a |
4061 | * format 2 image, we'll get ENOENT back, and we'll assume |
4062 | * it's a format 1 image. |
4063 | */ |
4064 | ret = rbd_dev_image_id(rbd_dev); |
4065 | if (ret) |
4066 | ret = rbd_dev_v1_probe(rbd_dev); |
4067 | else |
4068 | ret = rbd_dev_v2_probe(rbd_dev); |
4069 | if (ret) { |
4070 | dout("probe failed, returning %d\n", ret); |
4071 | |
4072 | return ret; |
4073 | } |
4074 | |
4075 | ret = rbd_dev_probe_finish(rbd_dev); |
4076 | if (ret) |
4077 | rbd_header_free(&rbd_dev->header); |
4078 | |
4079 | return ret; |
4080 | } |
4081 | |
4082 | static ssize_t rbd_add(struct bus_type *bus, |
4083 | const char *buf, |
4084 | size_t count) |
4085 | { |
4086 | struct rbd_device *rbd_dev = NULL; |
4087 | struct ceph_options *ceph_opts = NULL; |
4088 | struct rbd_options *rbd_opts = NULL; |
4089 | struct rbd_spec *spec = NULL; |
4090 | struct rbd_client *rbdc; |
4091 | struct ceph_osd_client *osdc; |
4092 | int rc = -ENOMEM; |
4093 | |
4094 | if (!try_module_get(THIS_MODULE)) |
4095 | return -ENODEV; |
4096 | |
4097 | /* parse add command */ |
4098 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
4099 | if (rc < 0) |
4100 | goto err_out_module; |
4101 | |
4102 | rbdc = rbd_get_client(ceph_opts); |
4103 | if (IS_ERR(rbdc)) { |
4104 | rc = PTR_ERR(rbdc); |
4105 | goto err_out_args; |
4106 | } |
4107 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
4108 | |
4109 | /* pick the pool */ |
4110 | osdc = &rbdc->client->osdc; |
4111 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
4112 | if (rc < 0) |
4113 | goto err_out_client; |
4114 | spec->pool_id = (u64) rc; |
4115 | |
4116 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4117 | |
4118 | if (WARN_ON(spec->pool_id > (u64) U32_MAX)) { |
4119 | rc = -EIO; |
4120 | goto err_out_client; |
4121 | } |
4122 | |
4123 | rbd_dev = rbd_dev_create(rbdc, spec); |
4124 | if (!rbd_dev) |
4125 | goto err_out_client; |
4126 | rbdc = NULL; /* rbd_dev now owns this */ |
4127 | spec = NULL; /* rbd_dev now owns this */ |
4128 | |
4129 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
4130 | kfree(rbd_opts); |
4131 | rbd_opts = NULL; /* done with this */ |
4132 | |
4133 | rc = rbd_dev_probe(rbd_dev); |
4134 | if (rc < 0) |
4135 | goto err_out_rbd_dev; |
4136 | |
4137 | return count; |
4138 | err_out_rbd_dev: |
4139 | rbd_dev_destroy(rbd_dev); |
4140 | err_out_client: |
4141 | rbd_put_client(rbdc); |
4142 | err_out_args: |
4143 | if (ceph_opts) |
4144 | ceph_destroy_options(ceph_opts); |
4145 | kfree(rbd_opts); |
4146 | rbd_spec_put(spec); |
4147 | err_out_module: |
4148 | module_put(THIS_MODULE); |
4149 | |
4150 | dout("Error adding device %s\n", buf); |
4151 | |
4152 | return (ssize_t) rc; |
4153 | } |
4154 | |
4155 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
4156 | { |
4157 | struct list_head *tmp; |
4158 | struct rbd_device *rbd_dev; |
4159 | |
4160 | spin_lock(&rbd_dev_list_lock); |
4161 | list_for_each(tmp, &rbd_dev_list) { |
4162 | rbd_dev = list_entry(tmp, struct rbd_device, node); |
4163 | if (rbd_dev->dev_id == dev_id) { |
4164 | spin_unlock(&rbd_dev_list_lock); |
4165 | return rbd_dev; |
4166 | } |
4167 | } |
4168 | spin_unlock(&rbd_dev_list_lock); |
4169 | return NULL; |
4170 | } |
4171 | |
4172 | static void rbd_dev_release(struct device *dev) |
4173 | { |
4174 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
4175 | |
4176 | if (rbd_dev->watch_event) |
4177 | rbd_dev_header_watch_sync(rbd_dev, 0); |
4178 | |
4179 | /* clean up and free blkdev */ |
4180 | rbd_free_disk(rbd_dev); |
4181 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
4182 | |
4183 | /* release allocated disk header fields */ |
4184 | rbd_header_free(&rbd_dev->header); |
4185 | |
4186 | /* done with the id, and with the rbd_dev */ |
4187 | rbd_dev_id_put(rbd_dev); |
4188 | rbd_assert(rbd_dev->rbd_client != NULL); |
4189 | rbd_dev_destroy(rbd_dev); |
4190 | |
4191 | /* release module ref */ |
4192 | module_put(THIS_MODULE); |
4193 | } |
4194 | |
4195 | static ssize_t rbd_remove(struct bus_type *bus, |
4196 | const char *buf, |
4197 | size_t count) |
4198 | { |
4199 | struct rbd_device *rbd_dev = NULL; |
4200 | int target_id, rc; |
4201 | unsigned long ul; |
4202 | int ret = count; |
4203 | |
4204 | rc = strict_strtoul(buf, 10, &ul); |
4205 | if (rc) |
4206 | return rc; |
4207 | |
4208 | /* convert to int; abort if we lost anything in the conversion */ |
4209 | target_id = (int) ul; |
4210 | if (target_id != ul) |
4211 | return -EINVAL; |
4212 | |
4213 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
4214 | |
4215 | rbd_dev = __rbd_get_dev(target_id); |
4216 | if (!rbd_dev) { |
4217 | ret = -ENOENT; |
4218 | goto done; |
4219 | } |
4220 | |
4221 | spin_lock_irq(&rbd_dev->lock); |
4222 | if (rbd_dev->open_count) |
4223 | ret = -EBUSY; |
4224 | else |
4225 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); |
4226 | spin_unlock_irq(&rbd_dev->lock); |
4227 | if (ret < 0) |
4228 | goto done; |
4229 | |
4230 | rbd_remove_all_snaps(rbd_dev); |
4231 | rbd_bus_del_dev(rbd_dev); |
4232 | |
4233 | done: |
4234 | mutex_unlock(&ctl_mutex); |
4235 | |
4236 | return ret; |
4237 | } |
4238 | |
4239 | /* |
4240 | * create control files in sysfs |
4241 | * /sys/bus/rbd/... |
4242 | */ |
4243 | static int rbd_sysfs_init(void) |
4244 | { |
4245 | int ret; |
4246 | |
4247 | ret = device_register(&rbd_root_dev); |
4248 | if (ret < 0) |
4249 | return ret; |
4250 | |
4251 | ret = bus_register(&rbd_bus_type); |
4252 | if (ret < 0) |
4253 | device_unregister(&rbd_root_dev); |
4254 | |
4255 | return ret; |
4256 | } |
4257 | |
4258 | static void rbd_sysfs_cleanup(void) |
4259 | { |
4260 | bus_unregister(&rbd_bus_type); |
4261 | device_unregister(&rbd_root_dev); |
4262 | } |
4263 | |
4264 | static int __init rbd_init(void) |
4265 | { |
4266 | int rc; |
4267 | |
4268 | if (!libceph_compatible(NULL)) { |
4269 | rbd_warn(NULL, "libceph incompatibility (quitting)"); |
4270 | |
4271 | return -EINVAL; |
4272 | } |
4273 | rc = rbd_sysfs_init(); |
4274 | if (rc) |
4275 | return rc; |
4276 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
4277 | return 0; |
4278 | } |
4279 | |
4280 | static void __exit rbd_exit(void) |
4281 | { |
4282 | rbd_sysfs_cleanup(); |
4283 | } |
4284 | |
4285 | module_init(rbd_init); |
4286 | module_exit(rbd_exit); |
4287 | |
4288 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
4289 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
4290 | MODULE_DESCRIPTION("rados block device"); |
4291 | |
4292 | /* following authorship retained from original osdblk.c */ |
4293 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
4294 | |
4295 | MODULE_LICENSE("GPL"); |
4296 |
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