Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
2647ba38 | 55 | /* It might be useful to have these defined elsewhere */ |
df111be6 | 56 | |
2647ba38 AE |
57 | #define U8_MAX ((u8) (~0U)) |
58 | #define U16_MAX ((u16) (~0U)) | |
59 | #define U32_MAX ((u32) (~0U)) | |
60 | #define U64_MAX ((u64) (~0ULL)) | |
df111be6 | 61 | |
f0f8cef5 AE |
62 | #define RBD_DRV_NAME "rbd" |
63 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
64 | |
65 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
66 | ||
d4b125e9 AE |
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 | ||
35d489f9 | 71 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
72 | |
73 | #define RBD_SNAP_HEAD_NAME "-" | |
74 | ||
9e15b77d AE |
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) | |
1e130199 | 77 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 78 | |
1e130199 | 79 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 80 | |
d889140c AE |
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 | ||
81a89793 AE |
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 | */ | |
602adf40 | 95 | #define DEV_NAME_LEN 32 |
81a89793 | 96 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
97 | |
98 | /* | |
99 | * block device image metadata (in-memory version) | |
100 | */ | |
101 | struct rbd_image_header { | |
f84344f3 | 102 | /* These four fields never change for a given rbd image */ |
849b4260 | 103 | char *object_prefix; |
34b13184 | 104 | u64 features; |
602adf40 YS |
105 | __u8 obj_order; |
106 | __u8 crypt_type; | |
107 | __u8 comp_type; | |
602adf40 | 108 | |
f84344f3 AE |
109 | /* The remaining fields need to be updated occasionally */ |
110 | u64 image_size; | |
111 | struct ceph_snap_context *snapc; | |
602adf40 YS |
112 | char *snap_names; |
113 | u64 *snap_sizes; | |
59c2be1e YS |
114 | |
115 | u64 obj_version; | |
116 | }; | |
117 | ||
0d7dbfce AE |
118 | /* |
119 | * An rbd image specification. | |
120 | * | |
121 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
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). | |
0d7dbfce AE |
142 | */ |
143 | struct rbd_spec { | |
144 | u64 pool_id; | |
145 | char *pool_name; | |
146 | ||
147 | char *image_id; | |
0d7dbfce | 148 | char *image_name; |
0d7dbfce AE |
149 | |
150 | u64 snap_id; | |
151 | char *snap_name; | |
152 | ||
153 | struct kref kref; | |
154 | }; | |
155 | ||
602adf40 | 156 | /* |
f0f8cef5 | 157 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
158 | */ |
159 | struct rbd_client { | |
160 | struct ceph_client *client; | |
161 | struct kref kref; | |
162 | struct list_head node; | |
163 | }; | |
164 | ||
bf0d5f50 AE |
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 | ||
9969ebc5 AE |
173 | enum obj_request_type { |
174 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
175 | }; | |
bf0d5f50 AE |
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; | |
788e2df3 AE |
187 | union { |
188 | struct bio *bio_list; | |
189 | struct { | |
190 | struct page **pages; | |
191 | u32 page_count; | |
192 | }; | |
193 | }; | |
bf0d5f50 AE |
194 | |
195 | struct ceph_osd_request *osd_req; | |
196 | ||
197 | u64 xferred; /* bytes transferred */ | |
198 | u64 version; | |
199 | s32 result; | |
200 | atomic_t done; | |
201 | ||
202 | rbd_obj_callback_t callback; | |
788e2df3 | 203 | struct completion completion; |
bf0d5f50 AE |
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) \ | |
ef06f4d3 | 229 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 230 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 231 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 232 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 233 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 234 | |
dfc5606d YS |
235 | struct rbd_snap { |
236 | struct device dev; | |
237 | const char *name; | |
3591538f | 238 | u64 size; |
dfc5606d YS |
239 | struct list_head node; |
240 | u64 id; | |
34b13184 | 241 | u64 features; |
dfc5606d YS |
242 | }; |
243 | ||
f84344f3 | 244 | struct rbd_mapping { |
99c1f08f | 245 | u64 size; |
34b13184 | 246 | u64 features; |
f84344f3 AE |
247 | bool read_only; |
248 | }; | |
249 | ||
602adf40 YS |
250 | /* |
251 | * a single device | |
252 | */ | |
253 | struct rbd_device { | |
de71a297 | 254 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
255 | |
256 | int major; /* blkdev assigned major */ | |
257 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 258 | |
a30b71b9 | 259 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
260 | struct rbd_client *rbd_client; |
261 | ||
262 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
263 | ||
b82d167b | 264 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
265 | |
266 | struct rbd_image_header header; | |
b82d167b | 267 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 268 | struct rbd_spec *spec; |
602adf40 | 269 | |
0d7dbfce | 270 | char *header_name; |
971f839a | 271 | |
0903e875 AE |
272 | struct ceph_file_layout layout; |
273 | ||
59c2be1e | 274 | struct ceph_osd_event *watch_event; |
975241af | 275 | struct rbd_obj_request *watch_request; |
59c2be1e | 276 | |
86b00e0d AE |
277 | struct rbd_spec *parent_spec; |
278 | u64 parent_overlap; | |
279 | ||
c666601a JD |
280 | /* protects updating the header */ |
281 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
282 | |
283 | struct rbd_mapping mapping; | |
602adf40 YS |
284 | |
285 | struct list_head node; | |
dfc5606d YS |
286 | |
287 | /* list of snapshots */ | |
288 | struct list_head snaps; | |
289 | ||
290 | /* sysfs related */ | |
291 | struct device dev; | |
b82d167b | 292 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
293 | }; |
294 | ||
b82d167b AE |
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 | */ | |
6d292906 AE |
302 | enum rbd_dev_flags { |
303 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 304 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
305 | }; |
306 | ||
602adf40 | 307 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 308 | |
602adf40 | 309 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
310 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
311 | ||
432b8587 AE |
312 | static LIST_HEAD(rbd_client_list); /* clients */ |
313 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 314 | |
304f6808 AE |
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 | ||
dfc5606d | 318 | static void rbd_dev_release(struct device *dev); |
41f38c2b | 319 | static void rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 320 | |
f0f8cef5 AE |
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 | ||
06ecc6cb AE |
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 | ||
aafb230e AE |
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 */ | |
dfc5606d | 385 | |
117973fb AE |
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); | |
59c2be1e | 388 | |
602adf40 YS |
389 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
390 | { | |
f0f8cef5 | 391 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 392 | bool removing = false; |
602adf40 | 393 | |
f84344f3 | 394 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
395 | return -EROFS; |
396 | ||
a14ea269 | 397 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
398 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
399 | removing = true; | |
400 | else | |
401 | rbd_dev->open_count++; | |
a14ea269 | 402 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
403 | if (removing) |
404 | return -ENOENT; | |
405 | ||
42382b70 | 406 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 407 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 408 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 409 | mutex_unlock(&ctl_mutex); |
340c7a2b | 410 | |
602adf40 YS |
411 | return 0; |
412 | } | |
413 | ||
dfc5606d YS |
414 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
415 | { | |
416 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
417 | unsigned long open_count_before; |
418 | ||
a14ea269 | 419 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 420 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 421 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 422 | rbd_assert(open_count_before > 0); |
dfc5606d | 423 | |
42382b70 | 424 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 425 | put_device(&rbd_dev->dev); |
42382b70 | 426 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
427 | |
428 | return 0; | |
429 | } | |
430 | ||
602adf40 YS |
431 | static const struct block_device_operations rbd_bd_ops = { |
432 | .owner = THIS_MODULE, | |
433 | .open = rbd_open, | |
dfc5606d | 434 | .release = rbd_release, |
602adf40 YS |
435 | }; |
436 | ||
437 | /* | |
438 | * Initialize an rbd client instance. | |
43ae4701 | 439 | * We own *ceph_opts. |
602adf40 | 440 | */ |
f8c38929 | 441 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
442 | { |
443 | struct rbd_client *rbdc; | |
444 | int ret = -ENOMEM; | |
445 | ||
446 | dout("rbd_client_create\n"); | |
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 | ||
bc534d86 AE |
454 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
455 | ||
43ae4701 | 456 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 457 | if (IS_ERR(rbdc->client)) |
bc534d86 | 458 | goto out_mutex; |
43ae4701 | 459 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
460 | |
461 | ret = ceph_open_session(rbdc->client); | |
462 | if (ret < 0) | |
463 | goto out_err; | |
464 | ||
432b8587 | 465 | spin_lock(&rbd_client_list_lock); |
602adf40 | 466 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 467 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 468 | |
bc534d86 AE |
469 | mutex_unlock(&ctl_mutex); |
470 | ||
602adf40 YS |
471 | dout("rbd_client_create created %p\n", rbdc); |
472 | return rbdc; | |
473 | ||
474 | out_err: | |
475 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
476 | out_mutex: |
477 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
478 | kfree(rbdc); |
479 | out_opt: | |
43ae4701 AE |
480 | if (ceph_opts) |
481 | ceph_destroy_options(ceph_opts); | |
28f259b7 | 482 | return ERR_PTR(ret); |
602adf40 YS |
483 | } |
484 | ||
485 | /* | |
1f7ba331 AE |
486 | * Find a ceph client with specific addr and configuration. If |
487 | * found, bump its reference count. | |
602adf40 | 488 | */ |
1f7ba331 | 489 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
490 | { |
491 | struct rbd_client *client_node; | |
1f7ba331 | 492 | bool found = false; |
602adf40 | 493 | |
43ae4701 | 494 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
495 | return NULL; |
496 | ||
1f7ba331 AE |
497 | spin_lock(&rbd_client_list_lock); |
498 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
499 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
500 | kref_get(&client_node->kref); | |
501 | found = true; | |
502 | break; | |
503 | } | |
504 | } | |
505 | spin_unlock(&rbd_client_list_lock); | |
506 | ||
507 | return found ? client_node : NULL; | |
602adf40 YS |
508 | } |
509 | ||
59c2be1e YS |
510 | /* |
511 | * mount options | |
512 | */ | |
513 | enum { | |
59c2be1e YS |
514 | Opt_last_int, |
515 | /* int args above */ | |
516 | Opt_last_string, | |
517 | /* string args above */ | |
cc0538b6 AE |
518 | Opt_read_only, |
519 | Opt_read_write, | |
520 | /* Boolean args above */ | |
521 | Opt_last_bool, | |
59c2be1e YS |
522 | }; |
523 | ||
43ae4701 | 524 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
525 | /* int args above */ |
526 | /* string args above */ | |
be466c1c | 527 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
528 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
529 | {Opt_read_write, "read_write"}, | |
530 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
531 | /* Boolean args above */ | |
59c2be1e YS |
532 | {-1, NULL} |
533 | }; | |
534 | ||
98571b5a AE |
535 | struct rbd_options { |
536 | bool read_only; | |
537 | }; | |
538 | ||
539 | #define RBD_READ_ONLY_DEFAULT false | |
540 | ||
59c2be1e YS |
541 | static int parse_rbd_opts_token(char *c, void *private) |
542 | { | |
43ae4701 | 543 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
544 | substring_t argstr[MAX_OPT_ARGS]; |
545 | int token, intval, ret; | |
546 | ||
43ae4701 | 547 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
548 | if (token < 0) |
549 | return -EINVAL; | |
550 | ||
551 | if (token < Opt_last_int) { | |
552 | ret = match_int(&argstr[0], &intval); | |
553 | if (ret < 0) { | |
554 | pr_err("bad mount option arg (not int) " | |
555 | "at '%s'\n", c); | |
556 | return ret; | |
557 | } | |
558 | dout("got int token %d val %d\n", token, intval); | |
559 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
560 | dout("got string token %d val %s\n", token, | |
561 | argstr[0].from); | |
cc0538b6 AE |
562 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
563 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
564 | } else { |
565 | dout("got token %d\n", token); | |
566 | } | |
567 | ||
568 | switch (token) { | |
cc0538b6 AE |
569 | case Opt_read_only: |
570 | rbd_opts->read_only = true; | |
571 | break; | |
572 | case Opt_read_write: | |
573 | rbd_opts->read_only = false; | |
574 | break; | |
59c2be1e | 575 | default: |
aafb230e AE |
576 | rbd_assert(false); |
577 | break; | |
59c2be1e YS |
578 | } |
579 | return 0; | |
580 | } | |
581 | ||
602adf40 YS |
582 | /* |
583 | * Get a ceph client with specific addr and configuration, if one does | |
584 | * not exist create it. | |
585 | */ | |
9d3997fd | 586 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 587 | { |
f8c38929 | 588 | struct rbd_client *rbdc; |
59c2be1e | 589 | |
1f7ba331 | 590 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 591 | if (rbdc) /* using an existing client */ |
43ae4701 | 592 | ceph_destroy_options(ceph_opts); |
9d3997fd | 593 | else |
f8c38929 | 594 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 595 | |
9d3997fd | 596 | return rbdc; |
602adf40 YS |
597 | } |
598 | ||
599 | /* | |
600 | * Destroy ceph client | |
d23a4b3f | 601 | * |
432b8587 | 602 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
603 | */ |
604 | static void rbd_client_release(struct kref *kref) | |
605 | { | |
606 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
607 | ||
608 | dout("rbd_release_client %p\n", rbdc); | |
cd9d9f5d | 609 | spin_lock(&rbd_client_list_lock); |
602adf40 | 610 | list_del(&rbdc->node); |
cd9d9f5d | 611 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
612 | |
613 | ceph_destroy_client(rbdc->client); | |
614 | kfree(rbdc); | |
615 | } | |
616 | ||
617 | /* | |
618 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
619 | * it. | |
620 | */ | |
9d3997fd | 621 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 622 | { |
c53d5893 AE |
623 | if (rbdc) |
624 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
625 | } |
626 | ||
a30b71b9 AE |
627 | static bool rbd_image_format_valid(u32 image_format) |
628 | { | |
629 | return image_format == 1 || image_format == 2; | |
630 | } | |
631 | ||
8e94af8e AE |
632 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
633 | { | |
103a150f AE |
634 | size_t size; |
635 | u32 snap_count; | |
636 | ||
637 | /* The header has to start with the magic rbd header text */ | |
638 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
639 | return false; | |
640 | ||
db2388b6 AE |
641 | /* The bio layer requires at least sector-sized I/O */ |
642 | ||
643 | if (ondisk->options.order < SECTOR_SHIFT) | |
644 | return false; | |
645 | ||
646 | /* If we use u64 in a few spots we may be able to loosen this */ | |
647 | ||
648 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
649 | return false; | |
650 | ||
103a150f AE |
651 | /* |
652 | * The size of a snapshot header has to fit in a size_t, and | |
653 | * that limits the number of snapshots. | |
654 | */ | |
655 | snap_count = le32_to_cpu(ondisk->snap_count); | |
656 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
657 | if (snap_count > size / sizeof (__le64)) | |
658 | return false; | |
659 | ||
660 | /* | |
661 | * Not only that, but the size of the entire the snapshot | |
662 | * header must also be representable in a size_t. | |
663 | */ | |
664 | size -= snap_count * sizeof (__le64); | |
665 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
666 | return false; | |
667 | ||
668 | return true; | |
8e94af8e AE |
669 | } |
670 | ||
602adf40 YS |
671 | /* |
672 | * Create a new header structure, translate header format from the on-disk | |
673 | * header. | |
674 | */ | |
675 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 676 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 677 | { |
ccece235 | 678 | u32 snap_count; |
58c17b0e | 679 | size_t len; |
d2bb24e5 | 680 | size_t size; |
621901d6 | 681 | u32 i; |
602adf40 | 682 | |
6a52325f AE |
683 | memset(header, 0, sizeof (*header)); |
684 | ||
103a150f AE |
685 | snap_count = le32_to_cpu(ondisk->snap_count); |
686 | ||
58c17b0e AE |
687 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
688 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 689 | if (!header->object_prefix) |
602adf40 | 690 | return -ENOMEM; |
58c17b0e AE |
691 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
692 | header->object_prefix[len] = '\0'; | |
00f1f36f | 693 | |
602adf40 | 694 | if (snap_count) { |
f785cc1d AE |
695 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
696 | ||
621901d6 AE |
697 | /* Save a copy of the snapshot names */ |
698 | ||
f785cc1d AE |
699 | if (snap_names_len > (u64) SIZE_MAX) |
700 | return -EIO; | |
701 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 702 | if (!header->snap_names) |
6a52325f | 703 | goto out_err; |
f785cc1d AE |
704 | /* |
705 | * Note that rbd_dev_v1_header_read() guarantees | |
706 | * the ondisk buffer we're working with has | |
707 | * snap_names_len bytes beyond the end of the | |
708 | * snapshot id array, this memcpy() is safe. | |
709 | */ | |
710 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
711 | snap_names_len); | |
6a52325f | 712 | |
621901d6 AE |
713 | /* Record each snapshot's size */ |
714 | ||
d2bb24e5 AE |
715 | size = snap_count * sizeof (*header->snap_sizes); |
716 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 717 | if (!header->snap_sizes) |
6a52325f | 718 | goto out_err; |
621901d6 AE |
719 | for (i = 0; i < snap_count; i++) |
720 | header->snap_sizes[i] = | |
721 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 722 | } else { |
ccece235 | 723 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
724 | header->snap_names = NULL; |
725 | header->snap_sizes = NULL; | |
726 | } | |
849b4260 | 727 | |
34b13184 | 728 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
729 | header->obj_order = ondisk->options.order; |
730 | header->crypt_type = ondisk->options.crypt_type; | |
731 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 732 | |
621901d6 AE |
733 | /* Allocate and fill in the snapshot context */ |
734 | ||
f84344f3 | 735 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
736 | size = sizeof (struct ceph_snap_context); |
737 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
738 | header->snapc = kzalloc(size, GFP_KERNEL); | |
739 | if (!header->snapc) | |
740 | goto out_err; | |
602adf40 YS |
741 | |
742 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 743 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 744 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
745 | for (i = 0; i < snap_count; i++) |
746 | header->snapc->snaps[i] = | |
747 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
748 | |
749 | return 0; | |
750 | ||
6a52325f | 751 | out_err: |
849b4260 | 752 | kfree(header->snap_sizes); |
ccece235 | 753 | header->snap_sizes = NULL; |
602adf40 | 754 | kfree(header->snap_names); |
ccece235 | 755 | header->snap_names = NULL; |
6a52325f AE |
756 | kfree(header->object_prefix); |
757 | header->object_prefix = NULL; | |
ccece235 | 758 | |
00f1f36f | 759 | return -ENOMEM; |
602adf40 YS |
760 | } |
761 | ||
9e15b77d AE |
762 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
763 | { | |
764 | struct rbd_snap *snap; | |
765 | ||
766 | if (snap_id == CEPH_NOSNAP) | |
767 | return RBD_SNAP_HEAD_NAME; | |
768 | ||
769 | list_for_each_entry(snap, &rbd_dev->snaps, node) | |
770 | if (snap_id == snap->id) | |
771 | return snap->name; | |
772 | ||
773 | return NULL; | |
774 | } | |
775 | ||
8836b995 | 776 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 777 | { |
602adf40 | 778 | |
e86924a8 | 779 | struct rbd_snap *snap; |
602adf40 | 780 | |
e86924a8 AE |
781 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
782 | if (!strcmp(snap_name, snap->name)) { | |
0d7dbfce | 783 | rbd_dev->spec->snap_id = snap->id; |
e86924a8 | 784 | rbd_dev->mapping.size = snap->size; |
34b13184 | 785 | rbd_dev->mapping.features = snap->features; |
602adf40 | 786 | |
e86924a8 | 787 | return 0; |
00f1f36f | 788 | } |
00f1f36f | 789 | } |
e86924a8 | 790 | |
00f1f36f | 791 | return -ENOENT; |
602adf40 YS |
792 | } |
793 | ||
819d52bf | 794 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) |
602adf40 | 795 | { |
78dc447d | 796 | int ret; |
602adf40 | 797 | |
0d7dbfce | 798 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 799 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0d7dbfce | 800 | rbd_dev->spec->snap_id = CEPH_NOSNAP; |
99c1f08f | 801 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 802 | rbd_dev->mapping.features = rbd_dev->header.features; |
e86924a8 | 803 | ret = 0; |
602adf40 | 804 | } else { |
0d7dbfce | 805 | ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); |
602adf40 YS |
806 | if (ret < 0) |
807 | goto done; | |
f84344f3 | 808 | rbd_dev->mapping.read_only = true; |
602adf40 | 809 | } |
6d292906 AE |
810 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811 | ||
602adf40 | 812 | done: |
602adf40 YS |
813 | return ret; |
814 | } | |
815 | ||
816 | static void rbd_header_free(struct rbd_image_header *header) | |
817 | { | |
849b4260 | 818 | kfree(header->object_prefix); |
d78fd7ae | 819 | header->object_prefix = NULL; |
602adf40 | 820 | kfree(header->snap_sizes); |
d78fd7ae | 821 | header->snap_sizes = NULL; |
849b4260 | 822 | kfree(header->snap_names); |
d78fd7ae | 823 | header->snap_names = NULL; |
d1d25646 | 824 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 825 | header->snapc = NULL; |
602adf40 YS |
826 | } |
827 | ||
98571b5a | 828 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 829 | { |
65ccfe21 AE |
830 | char *name; |
831 | u64 segment; | |
832 | int ret; | |
602adf40 | 833 | |
2fd82b9e | 834 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
835 | if (!name) |
836 | return NULL; | |
837 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 838 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 839 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 840 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
841 | pr_err("error formatting segment name for #%llu (%d)\n", |
842 | segment, ret); | |
843 | kfree(name); | |
844 | name = NULL; | |
845 | } | |
602adf40 | 846 | |
65ccfe21 AE |
847 | return name; |
848 | } | |
602adf40 | 849 | |
65ccfe21 AE |
850 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
851 | { | |
852 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 853 | |
65ccfe21 AE |
854 | return offset & (segment_size - 1); |
855 | } | |
856 | ||
857 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
858 | u64 offset, u64 length) | |
859 | { | |
860 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
861 | ||
862 | offset &= segment_size - 1; | |
863 | ||
aafb230e | 864 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
865 | if (offset + length > segment_size) |
866 | length = segment_size - offset; | |
867 | ||
868 | return length; | |
602adf40 YS |
869 | } |
870 | ||
029bcbd8 JD |
871 | /* |
872 | * returns the size of an object in the image | |
873 | */ | |
874 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
875 | { | |
876 | return 1 << header->obj_order; | |
877 | } | |
878 | ||
602adf40 YS |
879 | /* |
880 | * bio helpers | |
881 | */ | |
882 | ||
883 | static void bio_chain_put(struct bio *chain) | |
884 | { | |
885 | struct bio *tmp; | |
886 | ||
887 | while (chain) { | |
888 | tmp = chain; | |
889 | chain = chain->bi_next; | |
890 | bio_put(tmp); | |
891 | } | |
892 | } | |
893 | ||
894 | /* | |
895 | * zeros a bio chain, starting at specific offset | |
896 | */ | |
897 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
898 | { | |
899 | struct bio_vec *bv; | |
900 | unsigned long flags; | |
901 | void *buf; | |
902 | int i; | |
903 | int pos = 0; | |
904 | ||
905 | while (chain) { | |
906 | bio_for_each_segment(bv, chain, i) { | |
907 | if (pos + bv->bv_len > start_ofs) { | |
908 | int remainder = max(start_ofs - pos, 0); | |
909 | buf = bvec_kmap_irq(bv, &flags); | |
910 | memset(buf + remainder, 0, | |
911 | bv->bv_len - remainder); | |
85b5aaa6 | 912 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
913 | } |
914 | pos += bv->bv_len; | |
915 | } | |
916 | ||
917 | chain = chain->bi_next; | |
918 | } | |
919 | } | |
920 | ||
921 | /* | |
f7760dad AE |
922 | * Clone a portion of a bio, starting at the given byte offset |
923 | * and continuing for the number of bytes indicated. | |
602adf40 | 924 | */ |
f7760dad AE |
925 | static struct bio *bio_clone_range(struct bio *bio_src, |
926 | unsigned int offset, | |
927 | unsigned int len, | |
928 | gfp_t gfpmask) | |
602adf40 | 929 | { |
f7760dad AE |
930 | struct bio_vec *bv; |
931 | unsigned int resid; | |
932 | unsigned short idx; | |
933 | unsigned int voff; | |
934 | unsigned short end_idx; | |
935 | unsigned short vcnt; | |
936 | struct bio *bio; | |
937 | ||
938 | /* Handle the easy case for the caller */ | |
939 | ||
940 | if (!offset && len == bio_src->bi_size) | |
941 | return bio_clone(bio_src, gfpmask); | |
942 | ||
943 | if (WARN_ON_ONCE(!len)) | |
944 | return NULL; | |
945 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
946 | return NULL; | |
947 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
948 | return NULL; | |
949 | ||
950 | /* Find first affected segment... */ | |
951 | ||
952 | resid = offset; | |
953 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
954 | if (resid < bv->bv_len) | |
955 | break; | |
956 | resid -= bv->bv_len; | |
602adf40 | 957 | } |
f7760dad | 958 | voff = resid; |
602adf40 | 959 | |
f7760dad | 960 | /* ...and the last affected segment */ |
602adf40 | 961 | |
f7760dad AE |
962 | resid += len; |
963 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
964 | if (resid <= bv->bv_len) | |
965 | break; | |
966 | resid -= bv->bv_len; | |
967 | } | |
968 | vcnt = end_idx - idx + 1; | |
969 | ||
970 | /* Build the clone */ | |
971 | ||
972 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
973 | if (!bio) | |
974 | return NULL; /* ENOMEM */ | |
602adf40 | 975 | |
f7760dad AE |
976 | bio->bi_bdev = bio_src->bi_bdev; |
977 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
978 | bio->bi_rw = bio_src->bi_rw; | |
979 | bio->bi_flags |= 1 << BIO_CLONED; | |
980 | ||
981 | /* | |
982 | * Copy over our part of the bio_vec, then update the first | |
983 | * and last (or only) entries. | |
984 | */ | |
985 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
986 | vcnt * sizeof (struct bio_vec)); | |
987 | bio->bi_io_vec[0].bv_offset += voff; | |
988 | if (vcnt > 1) { | |
989 | bio->bi_io_vec[0].bv_len -= voff; | |
990 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
991 | } else { | |
992 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
993 | } |
994 | ||
f7760dad AE |
995 | bio->bi_vcnt = vcnt; |
996 | bio->bi_size = len; | |
997 | bio->bi_idx = 0; | |
998 | ||
999 | return bio; | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Clone a portion of a bio chain, starting at the given byte offset | |
1004 | * into the first bio in the source chain and continuing for the | |
1005 | * number of bytes indicated. The result is another bio chain of | |
1006 | * exactly the given length, or a null pointer on error. | |
1007 | * | |
1008 | * The bio_src and offset parameters are both in-out. On entry they | |
1009 | * refer to the first source bio and the offset into that bio where | |
1010 | * the start of data to be cloned is located. | |
1011 | * | |
1012 | * On return, bio_src is updated to refer to the bio in the source | |
1013 | * chain that contains first un-cloned byte, and *offset will | |
1014 | * contain the offset of that byte within that bio. | |
1015 | */ | |
1016 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1017 | unsigned int *offset, | |
1018 | unsigned int len, | |
1019 | gfp_t gfpmask) | |
1020 | { | |
1021 | struct bio *bi = *bio_src; | |
1022 | unsigned int off = *offset; | |
1023 | struct bio *chain = NULL; | |
1024 | struct bio **end; | |
1025 | ||
1026 | /* Build up a chain of clone bios up to the limit */ | |
1027 | ||
1028 | if (!bi || off >= bi->bi_size || !len) | |
1029 | return NULL; /* Nothing to clone */ | |
602adf40 | 1030 | |
f7760dad AE |
1031 | end = &chain; |
1032 | while (len) { | |
1033 | unsigned int bi_size; | |
1034 | struct bio *bio; | |
1035 | ||
f5400b7a AE |
1036 | if (!bi) { |
1037 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1038 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1039 | } |
f7760dad AE |
1040 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1041 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1042 | if (!bio) | |
1043 | goto out_err; /* ENOMEM */ | |
1044 | ||
1045 | *end = bio; | |
1046 | end = &bio->bi_next; | |
602adf40 | 1047 | |
f7760dad AE |
1048 | off += bi_size; |
1049 | if (off == bi->bi_size) { | |
1050 | bi = bi->bi_next; | |
1051 | off = 0; | |
1052 | } | |
1053 | len -= bi_size; | |
1054 | } | |
1055 | *bio_src = bi; | |
1056 | *offset = off; | |
1057 | ||
1058 | return chain; | |
1059 | out_err: | |
1060 | bio_chain_put(chain); | |
602adf40 | 1061 | |
602adf40 YS |
1062 | return NULL; |
1063 | } | |
1064 | ||
bf0d5f50 AE |
1065 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1066 | { | |
1067 | kref_get(&obj_request->kref); | |
1068 | } | |
1069 | ||
1070 | static void rbd_obj_request_destroy(struct kref *kref); | |
1071 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1072 | { | |
1073 | rbd_assert(obj_request != NULL); | |
1074 | kref_put(&obj_request->kref, rbd_obj_request_destroy); | |
1075 | } | |
1076 | ||
1077 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1078 | { | |
1079 | kref_get(&img_request->kref); | |
1080 | } | |
1081 | ||
1082 | static void rbd_img_request_destroy(struct kref *kref); | |
1083 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1084 | { | |
1085 | rbd_assert(img_request != NULL); | |
1086 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
1087 | } | |
1088 | ||
1089 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1090 | struct rbd_obj_request *obj_request) | |
1091 | { | |
25dcf954 AE |
1092 | rbd_assert(obj_request->img_request == NULL); |
1093 | ||
bf0d5f50 AE |
1094 | rbd_obj_request_get(obj_request); |
1095 | obj_request->img_request = img_request; | |
25dcf954 | 1096 | obj_request->which = img_request->obj_request_count; |
bf0d5f50 | 1097 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1098 | img_request->obj_request_count++; |
1099 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
bf0d5f50 AE |
1100 | } |
1101 | ||
1102 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1103 | struct rbd_obj_request *obj_request) | |
1104 | { | |
1105 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1106 | |
bf0d5f50 | 1107 | list_del(&obj_request->links); |
25dcf954 AE |
1108 | rbd_assert(img_request->obj_request_count > 0); |
1109 | img_request->obj_request_count--; | |
1110 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1111 | obj_request->which = BAD_WHICH; | |
bf0d5f50 | 1112 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1113 | obj_request->img_request = NULL; |
25dcf954 | 1114 | obj_request->callback = NULL; |
bf0d5f50 AE |
1115 | rbd_obj_request_put(obj_request); |
1116 | } | |
1117 | ||
1118 | static bool obj_request_type_valid(enum obj_request_type type) | |
1119 | { | |
1120 | switch (type) { | |
9969ebc5 | 1121 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1122 | case OBJ_REQUEST_BIO: |
788e2df3 | 1123 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1124 | return true; |
1125 | default: | |
1126 | return false; | |
1127 | } | |
1128 | } | |
1129 | ||
8d23bf29 AE |
1130 | struct ceph_osd_req_op *rbd_osd_req_op_create(u16 opcode, ...) |
1131 | { | |
1132 | struct ceph_osd_req_op *op; | |
1133 | va_list args; | |
2647ba38 | 1134 | size_t size; |
8d23bf29 AE |
1135 | |
1136 | op = kzalloc(sizeof (*op), GFP_NOIO); | |
1137 | if (!op) | |
1138 | return NULL; | |
1139 | op->op = opcode; | |
1140 | va_start(args, opcode); | |
1141 | switch (opcode) { | |
1142 | case CEPH_OSD_OP_READ: | |
1143 | case CEPH_OSD_OP_WRITE: | |
1144 | /* rbd_osd_req_op_create(READ, offset, length) */ | |
1145 | /* rbd_osd_req_op_create(WRITE, offset, length) */ | |
1146 | op->extent.offset = va_arg(args, u64); | |
1147 | op->extent.length = va_arg(args, u64); | |
1148 | if (opcode == CEPH_OSD_OP_WRITE) | |
1149 | op->payload_len = op->extent.length; | |
1150 | break; | |
2647ba38 AE |
1151 | case CEPH_OSD_OP_CALL: |
1152 | /* rbd_osd_req_op_create(CALL, class, method, data, datalen) */ | |
1153 | op->cls.class_name = va_arg(args, char *); | |
1154 | size = strlen(op->cls.class_name); | |
1155 | rbd_assert(size <= (size_t) U8_MAX); | |
1156 | op->cls.class_len = size; | |
1157 | op->payload_len = size; | |
1158 | ||
1159 | op->cls.method_name = va_arg(args, char *); | |
1160 | size = strlen(op->cls.method_name); | |
1161 | rbd_assert(size <= (size_t) U8_MAX); | |
1162 | op->cls.method_len = size; | |
1163 | op->payload_len += size; | |
1164 | ||
1165 | op->cls.argc = 0; | |
1166 | op->cls.indata = va_arg(args, void *); | |
1167 | size = va_arg(args, size_t); | |
1168 | rbd_assert(size <= (size_t) U32_MAX); | |
1169 | op->cls.indata_len = (u32) size; | |
1170 | op->payload_len += size; | |
1171 | break; | |
5efea49a AE |
1172 | case CEPH_OSD_OP_NOTIFY_ACK: |
1173 | case CEPH_OSD_OP_WATCH: | |
1174 | /* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */ | |
1175 | /* rbd_osd_req_op_create(WATCH, cookie, version, flag) */ | |
1176 | op->watch.cookie = va_arg(args, u64); | |
1177 | op->watch.ver = va_arg(args, u64); | |
1178 | op->watch.ver = cpu_to_le64(op->watch.ver); | |
1179 | if (opcode == CEPH_OSD_OP_WATCH && va_arg(args, int)) | |
1180 | op->watch.flag = (u8) 1; | |
1181 | break; | |
8d23bf29 AE |
1182 | default: |
1183 | rbd_warn(NULL, "unsupported opcode %hu\n", opcode); | |
1184 | kfree(op); | |
1185 | op = NULL; | |
1186 | break; | |
1187 | } | |
1188 | va_end(args); | |
1189 | ||
1190 | return op; | |
1191 | } | |
1192 | ||
1193 | static void rbd_osd_req_op_destroy(struct ceph_osd_req_op *op) | |
1194 | { | |
1195 | kfree(op); | |
1196 | } | |
1197 | ||
bf0d5f50 AE |
1198 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1199 | struct rbd_obj_request *obj_request) | |
1200 | { | |
1201 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); | |
1202 | } | |
1203 | ||
1204 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1205 | { | |
1206 | if (img_request->callback) | |
1207 | img_request->callback(img_request); | |
1208 | else | |
1209 | rbd_img_request_put(img_request); | |
1210 | } | |
1211 | ||
788e2df3 AE |
1212 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1213 | ||
1214 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1215 | { | |
1216 | return wait_for_completion_interruptible(&obj_request->completion); | |
1217 | } | |
1218 | ||
07741308 AE |
1219 | static void obj_request_done_init(struct rbd_obj_request *obj_request) |
1220 | { | |
1221 | atomic_set(&obj_request->done, 0); | |
1222 | smp_wmb(); | |
1223 | } | |
1224 | ||
1225 | static void obj_request_done_set(struct rbd_obj_request *obj_request) | |
1226 | { | |
1227 | atomic_set(&obj_request->done, 1); | |
1228 | smp_wmb(); | |
1229 | } | |
1230 | ||
1231 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) | |
1232 | { | |
1233 | smp_rmb(); | |
1234 | return atomic_read(&obj_request->done) != 0; | |
1235 | } | |
1236 | ||
9969ebc5 AE |
1237 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request, |
1238 | struct ceph_osd_op *op) | |
1239 | { | |
07741308 | 1240 | obj_request_done_set(obj_request); |
9969ebc5 AE |
1241 | } |
1242 | ||
bf0d5f50 AE |
1243 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1244 | { | |
1245 | if (obj_request->callback) | |
1246 | obj_request->callback(obj_request); | |
788e2df3 AE |
1247 | else |
1248 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1249 | } |
1250 | ||
bf0d5f50 AE |
1251 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request, |
1252 | struct ceph_osd_op *op) | |
1253 | { | |
1254 | u64 xferred; | |
1255 | ||
1256 | /* | |
1257 | * We support a 64-bit length, but ultimately it has to be | |
1258 | * passed to blk_end_request(), which takes an unsigned int. | |
1259 | */ | |
1260 | xferred = le64_to_cpu(op->extent.length); | |
1261 | rbd_assert(xferred < (u64) UINT_MAX); | |
1262 | if (obj_request->result == (s32) -ENOENT) { | |
1263 | zero_bio_chain(obj_request->bio_list, 0); | |
1264 | obj_request->result = 0; | |
1265 | } else if (xferred < obj_request->length && !obj_request->result) { | |
1266 | zero_bio_chain(obj_request->bio_list, xferred); | |
1267 | xferred = obj_request->length; | |
1268 | } | |
1269 | obj_request->xferred = xferred; | |
07741308 | 1270 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1271 | } |
1272 | ||
1273 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request, | |
1274 | struct ceph_osd_op *op) | |
1275 | { | |
1276 | obj_request->xferred = le64_to_cpu(op->extent.length); | |
07741308 | 1277 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1278 | } |
1279 | ||
1280 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, | |
1281 | struct ceph_msg *msg) | |
1282 | { | |
1283 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
1284 | struct ceph_osd_reply_head *reply_head; | |
1285 | struct ceph_osd_op *op; | |
1286 | u32 num_ops; | |
1287 | u16 opcode; | |
1288 | ||
1289 | rbd_assert(osd_req == obj_request->osd_req); | |
1290 | rbd_assert(!!obj_request->img_request ^ | |
1291 | (obj_request->which == BAD_WHICH)); | |
1292 | ||
1293 | obj_request->xferred = le32_to_cpu(msg->hdr.data_len); | |
1294 | reply_head = msg->front.iov_base; | |
1295 | obj_request->result = (s32) le32_to_cpu(reply_head->result); | |
1296 | obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); | |
1297 | ||
1298 | num_ops = le32_to_cpu(reply_head->num_ops); | |
1299 | WARN_ON(num_ops != 1); /* For now */ | |
1300 | ||
1301 | op = &reply_head->ops[0]; | |
1302 | opcode = le16_to_cpu(op->op); | |
1303 | switch (opcode) { | |
1304 | case CEPH_OSD_OP_READ: | |
1305 | rbd_osd_read_callback(obj_request, op); | |
1306 | break; | |
1307 | case CEPH_OSD_OP_WRITE: | |
1308 | rbd_osd_write_callback(obj_request, op); | |
1309 | break; | |
36be9a76 | 1310 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1311 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 AE |
1312 | case CEPH_OSD_OP_WATCH: |
1313 | rbd_osd_trivial_callback(obj_request, op); | |
1314 | break; | |
bf0d5f50 AE |
1315 | default: |
1316 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1317 | obj_request->object_name, (unsigned short) opcode); | |
1318 | break; | |
1319 | } | |
1320 | ||
07741308 | 1321 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1322 | rbd_obj_request_complete(obj_request); |
1323 | } | |
1324 | ||
1325 | static struct ceph_osd_request *rbd_osd_req_create( | |
1326 | struct rbd_device *rbd_dev, | |
1327 | bool write_request, | |
1328 | struct rbd_obj_request *obj_request, | |
1329 | struct ceph_osd_req_op *op) | |
1330 | { | |
1331 | struct rbd_img_request *img_request = obj_request->img_request; | |
1332 | struct ceph_snap_context *snapc = NULL; | |
1333 | struct ceph_osd_client *osdc; | |
1334 | struct ceph_osd_request *osd_req; | |
1335 | struct timespec now; | |
1336 | struct timespec *mtime; | |
1337 | u64 snap_id = CEPH_NOSNAP; | |
1338 | u64 offset = obj_request->offset; | |
1339 | u64 length = obj_request->length; | |
1340 | ||
1341 | if (img_request) { | |
1342 | rbd_assert(img_request->write_request == write_request); | |
1343 | if (img_request->write_request) | |
1344 | snapc = img_request->snapc; | |
1345 | else | |
1346 | snap_id = img_request->snap_id; | |
1347 | } | |
1348 | ||
1349 | /* Allocate and initialize the request, for the single op */ | |
1350 | ||
1351 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1352 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1353 | if (!osd_req) | |
1354 | return NULL; /* ENOMEM */ | |
1355 | ||
1356 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1357 | switch (obj_request->type) { | |
9969ebc5 AE |
1358 | case OBJ_REQUEST_NODATA: |
1359 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1360 | case OBJ_REQUEST_BIO: |
1361 | rbd_assert(obj_request->bio_list != NULL); | |
1362 | osd_req->r_bio = obj_request->bio_list; | |
bf0d5f50 | 1363 | break; |
788e2df3 AE |
1364 | case OBJ_REQUEST_PAGES: |
1365 | osd_req->r_pages = obj_request->pages; | |
1366 | osd_req->r_num_pages = obj_request->page_count; | |
1367 | osd_req->r_page_alignment = offset & ~PAGE_MASK; | |
1368 | break; | |
bf0d5f50 AE |
1369 | } |
1370 | ||
1371 | if (write_request) { | |
1372 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1373 | now = CURRENT_TIME; | |
1374 | mtime = &now; | |
1375 | } else { | |
1376 | osd_req->r_flags = CEPH_OSD_FLAG_READ; | |
1377 | mtime = NULL; /* not needed for reads */ | |
1378 | offset = 0; /* These are not used... */ | |
1379 | length = 0; /* ...for osd read requests */ | |
1380 | } | |
1381 | ||
1382 | osd_req->r_callback = rbd_osd_req_callback; | |
1383 | osd_req->r_priv = obj_request; | |
1384 | ||
1385 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1386 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1387 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1388 | ||
1389 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1390 | ||
1391 | /* osd_req will get its own reference to snapc (if non-null) */ | |
1392 | ||
1393 | ceph_osdc_build_request(osd_req, offset, length, 1, op, | |
1394 | snapc, snap_id, mtime); | |
1395 | ||
1396 | return osd_req; | |
1397 | } | |
1398 | ||
1399 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) | |
1400 | { | |
1401 | ceph_osdc_put_request(osd_req); | |
1402 | } | |
1403 | ||
1404 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1405 | ||
1406 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1407 | u64 offset, u64 length, | |
1408 | enum obj_request_type type) | |
1409 | { | |
1410 | struct rbd_obj_request *obj_request; | |
1411 | size_t size; | |
1412 | char *name; | |
1413 | ||
1414 | rbd_assert(obj_request_type_valid(type)); | |
1415 | ||
1416 | size = strlen(object_name) + 1; | |
1417 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1418 | if (!obj_request) | |
1419 | return NULL; | |
1420 | ||
1421 | name = (char *)(obj_request + 1); | |
1422 | obj_request->object_name = memcpy(name, object_name, size); | |
1423 | obj_request->offset = offset; | |
1424 | obj_request->length = length; | |
1425 | obj_request->which = BAD_WHICH; | |
1426 | obj_request->type = type; | |
1427 | INIT_LIST_HEAD(&obj_request->links); | |
07741308 | 1428 | obj_request_done_init(obj_request); |
788e2df3 | 1429 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1430 | kref_init(&obj_request->kref); |
1431 | ||
1432 | return obj_request; | |
1433 | } | |
1434 | ||
1435 | static void rbd_obj_request_destroy(struct kref *kref) | |
1436 | { | |
1437 | struct rbd_obj_request *obj_request; | |
1438 | ||
1439 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1440 | ||
1441 | rbd_assert(obj_request->img_request == NULL); | |
1442 | rbd_assert(obj_request->which == BAD_WHICH); | |
1443 | ||
1444 | if (obj_request->osd_req) | |
1445 | rbd_osd_req_destroy(obj_request->osd_req); | |
1446 | ||
1447 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1448 | switch (obj_request->type) { | |
9969ebc5 AE |
1449 | case OBJ_REQUEST_NODATA: |
1450 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1451 | case OBJ_REQUEST_BIO: |
1452 | if (obj_request->bio_list) | |
1453 | bio_chain_put(obj_request->bio_list); | |
1454 | break; | |
788e2df3 AE |
1455 | case OBJ_REQUEST_PAGES: |
1456 | if (obj_request->pages) | |
1457 | ceph_release_page_vector(obj_request->pages, | |
1458 | obj_request->page_count); | |
1459 | break; | |
bf0d5f50 AE |
1460 | } |
1461 | ||
1462 | kfree(obj_request); | |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * Caller is responsible for filling in the list of object requests | |
1467 | * that comprises the image request, and the Linux request pointer | |
1468 | * (if there is one). | |
1469 | */ | |
1470 | struct rbd_img_request *rbd_img_request_create(struct rbd_device *rbd_dev, | |
1471 | u64 offset, u64 length, | |
1472 | bool write_request) | |
1473 | { | |
1474 | struct rbd_img_request *img_request; | |
1475 | struct ceph_snap_context *snapc = NULL; | |
1476 | ||
1477 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1478 | if (!img_request) | |
1479 | return NULL; | |
1480 | ||
1481 | if (write_request) { | |
1482 | down_read(&rbd_dev->header_rwsem); | |
1483 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); | |
1484 | up_read(&rbd_dev->header_rwsem); | |
1485 | if (WARN_ON(!snapc)) { | |
1486 | kfree(img_request); | |
1487 | return NULL; /* Shouldn't happen */ | |
1488 | } | |
1489 | } | |
1490 | ||
1491 | img_request->rq = NULL; | |
1492 | img_request->rbd_dev = rbd_dev; | |
1493 | img_request->offset = offset; | |
1494 | img_request->length = length; | |
1495 | img_request->write_request = write_request; | |
1496 | if (write_request) | |
1497 | img_request->snapc = snapc; | |
1498 | else | |
1499 | img_request->snap_id = rbd_dev->spec->snap_id; | |
1500 | spin_lock_init(&img_request->completion_lock); | |
1501 | img_request->next_completion = 0; | |
1502 | img_request->callback = NULL; | |
1503 | img_request->obj_request_count = 0; | |
1504 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1505 | kref_init(&img_request->kref); | |
1506 | ||
1507 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1508 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1509 | ||
1510 | return img_request; | |
1511 | } | |
1512 | ||
1513 | static void rbd_img_request_destroy(struct kref *kref) | |
1514 | { | |
1515 | struct rbd_img_request *img_request; | |
1516 | struct rbd_obj_request *obj_request; | |
1517 | struct rbd_obj_request *next_obj_request; | |
1518 | ||
1519 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1520 | ||
1521 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
1522 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1523 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 AE |
1524 | |
1525 | if (img_request->write_request) | |
1526 | ceph_put_snap_context(img_request->snapc); | |
1527 | ||
1528 | kfree(img_request); | |
1529 | } | |
1530 | ||
1531 | static int rbd_img_request_fill_bio(struct rbd_img_request *img_request, | |
1532 | struct bio *bio_list) | |
1533 | { | |
1534 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1535 | struct rbd_obj_request *obj_request = NULL; | |
1536 | struct rbd_obj_request *next_obj_request; | |
1537 | unsigned int bio_offset; | |
1538 | u64 image_offset; | |
1539 | u64 resid; | |
1540 | u16 opcode; | |
1541 | ||
1542 | opcode = img_request->write_request ? CEPH_OSD_OP_WRITE | |
1543 | : CEPH_OSD_OP_READ; | |
1544 | bio_offset = 0; | |
1545 | image_offset = img_request->offset; | |
1546 | rbd_assert(image_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1547 | resid = img_request->length; | |
1548 | while (resid) { | |
1549 | const char *object_name; | |
1550 | unsigned int clone_size; | |
1551 | struct ceph_osd_req_op *op; | |
1552 | u64 offset; | |
1553 | u64 length; | |
1554 | ||
1555 | object_name = rbd_segment_name(rbd_dev, image_offset); | |
1556 | if (!object_name) | |
1557 | goto out_unwind; | |
1558 | offset = rbd_segment_offset(rbd_dev, image_offset); | |
1559 | length = rbd_segment_length(rbd_dev, image_offset, resid); | |
1560 | obj_request = rbd_obj_request_create(object_name, | |
1561 | offset, length, | |
1562 | OBJ_REQUEST_BIO); | |
1563 | kfree(object_name); /* object request has its own copy */ | |
1564 | if (!obj_request) | |
1565 | goto out_unwind; | |
1566 | ||
1567 | rbd_assert(length <= (u64) UINT_MAX); | |
1568 | clone_size = (unsigned int) length; | |
1569 | obj_request->bio_list = bio_chain_clone_range(&bio_list, | |
1570 | &bio_offset, clone_size, | |
1571 | GFP_ATOMIC); | |
1572 | if (!obj_request->bio_list) | |
1573 | goto out_partial; | |
1574 | ||
1575 | /* | |
1576 | * Build up the op to use in building the osd | |
1577 | * request. Note that the contents of the op are | |
1578 | * copied by rbd_osd_req_create(). | |
1579 | */ | |
1580 | op = rbd_osd_req_op_create(opcode, offset, length); | |
1581 | if (!op) | |
1582 | goto out_partial; | |
1583 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, | |
1584 | img_request->write_request, | |
1585 | obj_request, op); | |
1586 | rbd_osd_req_op_destroy(op); | |
1587 | if (!obj_request->osd_req) | |
1588 | goto out_partial; | |
1589 | /* status and version are initially zero-filled */ | |
1590 | ||
1591 | rbd_img_obj_request_add(img_request, obj_request); | |
1592 | ||
1593 | image_offset += length; | |
1594 | resid -= length; | |
1595 | } | |
1596 | ||
1597 | return 0; | |
1598 | ||
1599 | out_partial: | |
1600 | rbd_obj_request_put(obj_request); | |
1601 | out_unwind: | |
1602 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
1603 | rbd_obj_request_put(obj_request); | |
1604 | ||
1605 | return -ENOMEM; | |
1606 | } | |
1607 | ||
1608 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) | |
1609 | { | |
1610 | struct rbd_img_request *img_request; | |
1611 | u32 which = obj_request->which; | |
1612 | bool more = true; | |
1613 | ||
1614 | img_request = obj_request->img_request; | |
1615 | rbd_assert(img_request != NULL); | |
1616 | rbd_assert(img_request->rq != NULL); | |
1617 | rbd_assert(which != BAD_WHICH); | |
1618 | rbd_assert(which < img_request->obj_request_count); | |
1619 | rbd_assert(which >= img_request->next_completion); | |
1620 | ||
1621 | spin_lock_irq(&img_request->completion_lock); | |
1622 | if (which != img_request->next_completion) | |
1623 | goto out; | |
1624 | ||
1625 | for_each_obj_request_from(img_request, obj_request) { | |
1626 | unsigned int xferred; | |
1627 | int result; | |
1628 | ||
1629 | rbd_assert(more); | |
1630 | rbd_assert(which < img_request->obj_request_count); | |
1631 | ||
07741308 | 1632 | if (!obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1633 | break; |
1634 | ||
1635 | rbd_assert(obj_request->xferred <= (u64) UINT_MAX); | |
1636 | xferred = (unsigned int) obj_request->xferred; | |
1637 | result = (int) obj_request->result; | |
1638 | if (result) | |
1639 | rbd_warn(NULL, "obj_request %s result %d xferred %u\n", | |
1640 | img_request->write_request ? "write" : "read", | |
1641 | result, xferred); | |
1642 | ||
1643 | more = blk_end_request(img_request->rq, result, xferred); | |
1644 | which++; | |
1645 | } | |
1646 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1647 | img_request->next_completion = which; | |
1648 | out: | |
1649 | spin_unlock_irq(&img_request->completion_lock); | |
1650 | ||
1651 | if (!more) | |
1652 | rbd_img_request_complete(img_request); | |
1653 | } | |
1654 | ||
1655 | static int rbd_img_request_submit(struct rbd_img_request *img_request) | |
1656 | { | |
1657 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1658 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
1659 | struct rbd_obj_request *obj_request; | |
1660 | ||
1661 | for_each_obj_request(img_request, obj_request) { | |
1662 | int ret; | |
1663 | ||
1664 | obj_request->callback = rbd_img_obj_callback; | |
1665 | ret = rbd_obj_request_submit(osdc, obj_request); | |
1666 | if (ret) | |
1667 | return ret; | |
1668 | /* | |
1669 | * The image request has its own reference to each | |
1670 | * of its object requests, so we can safely drop the | |
1671 | * initial one here. | |
1672 | */ | |
1673 | rbd_obj_request_put(obj_request); | |
1674 | } | |
1675 | ||
1676 | return 0; | |
1677 | } | |
1678 | ||
cf81b60e | 1679 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, |
b8d70035 AE |
1680 | u64 ver, u64 notify_id) |
1681 | { | |
1682 | struct rbd_obj_request *obj_request; | |
1683 | struct ceph_osd_req_op *op; | |
1684 | struct ceph_osd_client *osdc; | |
1685 | int ret; | |
1686 | ||
1687 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
1688 | OBJ_REQUEST_NODATA); | |
1689 | if (!obj_request) | |
1690 | return -ENOMEM; | |
1691 | ||
1692 | ret = -ENOMEM; | |
1693 | op = rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK, notify_id, ver); | |
1694 | if (!op) | |
1695 | goto out; | |
1696 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
1697 | obj_request, op); | |
1698 | rbd_osd_req_op_destroy(op); | |
1699 | if (!obj_request->osd_req) | |
1700 | goto out; | |
1701 | ||
1702 | osdc = &rbd_dev->rbd_client->client->osdc; | |
cf81b60e | 1703 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 1704 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 1705 | out: |
cf81b60e AE |
1706 | if (ret) |
1707 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
1708 | |
1709 | return ret; | |
1710 | } | |
1711 | ||
1712 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1713 | { | |
1714 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
1715 | u64 hver; | |
1716 | int rc; | |
1717 | ||
1718 | if (!rbd_dev) | |
1719 | return; | |
1720 | ||
1721 | dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", | |
1722 | rbd_dev->header_name, (unsigned long long) notify_id, | |
1723 | (unsigned int) opcode); | |
1724 | rc = rbd_dev_refresh(rbd_dev, &hver); | |
1725 | if (rc) | |
1726 | rbd_warn(rbd_dev, "got notification but failed to " | |
1727 | " update snaps: %d\n", rc); | |
1728 | ||
cf81b60e | 1729 | rbd_obj_notify_ack(rbd_dev, hver, notify_id); |
b8d70035 AE |
1730 | } |
1731 | ||
9969ebc5 AE |
1732 | /* |
1733 | * Request sync osd watch/unwatch. The value of "start" determines | |
1734 | * whether a watch request is being initiated or torn down. | |
1735 | */ | |
1736 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
1737 | { | |
1738 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
1739 | struct rbd_obj_request *obj_request; | |
1740 | struct ceph_osd_req_op *op; | |
1741 | int ret; | |
1742 | ||
1743 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
1744 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
1745 | ||
1746 | if (start) { | |
3c663bbd | 1747 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
1748 | &rbd_dev->watch_event); |
1749 | if (ret < 0) | |
1750 | return ret; | |
8eb87565 | 1751 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
1752 | } |
1753 | ||
1754 | ret = -ENOMEM; | |
1755 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
1756 | OBJ_REQUEST_NODATA); | |
1757 | if (!obj_request) | |
1758 | goto out_cancel; | |
1759 | ||
1760 | op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH, | |
1761 | rbd_dev->watch_event->cookie, | |
1762 | rbd_dev->header.obj_version, start); | |
1763 | if (!op) | |
1764 | goto out_cancel; | |
1765 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, | |
1766 | obj_request, op); | |
1767 | rbd_osd_req_op_destroy(op); | |
1768 | if (!obj_request->osd_req) | |
1769 | goto out_cancel; | |
1770 | ||
8eb87565 | 1771 | if (start) |
975241af | 1772 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 1773 | else |
6977c3f9 | 1774 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 1775 | rbd_dev->watch_request->osd_req); |
9969ebc5 AE |
1776 | ret = rbd_obj_request_submit(osdc, obj_request); |
1777 | if (ret) | |
1778 | goto out_cancel; | |
1779 | ret = rbd_obj_request_wait(obj_request); | |
1780 | if (ret) | |
1781 | goto out_cancel; | |
9969ebc5 AE |
1782 | ret = obj_request->result; |
1783 | if (ret) | |
1784 | goto out_cancel; | |
1785 | ||
8eb87565 AE |
1786 | /* |
1787 | * A watch request is set to linger, so the underlying osd | |
1788 | * request won't go away until we unregister it. We retain | |
1789 | * a pointer to the object request during that time (in | |
1790 | * rbd_dev->watch_request), so we'll keep a reference to | |
1791 | * it. We'll drop that reference (below) after we've | |
1792 | * unregistered it. | |
1793 | */ | |
1794 | if (start) { | |
1795 | rbd_dev->watch_request = obj_request; | |
1796 | ||
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | /* We have successfully torn down the watch request */ | |
1801 | ||
1802 | rbd_obj_request_put(rbd_dev->watch_request); | |
1803 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
1804 | out_cancel: |
1805 | /* Cancel the event if we're tearing down, or on error */ | |
1806 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
1807 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
1808 | if (obj_request) |
1809 | rbd_obj_request_put(obj_request); | |
1810 | ||
1811 | return ret; | |
1812 | } | |
1813 | ||
36be9a76 AE |
1814 | /* |
1815 | * Synchronous osd object method call | |
1816 | */ | |
1817 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
1818 | const char *object_name, | |
1819 | const char *class_name, | |
1820 | const char *method_name, | |
1821 | const char *outbound, | |
1822 | size_t outbound_size, | |
1823 | char *inbound, | |
1824 | size_t inbound_size, | |
1825 | u64 *version) | |
1826 | { | |
1827 | struct rbd_obj_request *obj_request; | |
1828 | struct ceph_osd_client *osdc; | |
1829 | struct ceph_osd_req_op *op; | |
1830 | struct page **pages; | |
1831 | u32 page_count; | |
1832 | int ret; | |
1833 | ||
1834 | /* | |
1835 | * Method calls are ultimately read operations but they | |
1836 | * don't involve object data (so no offset or length). | |
1837 | * The result should placed into the inbound buffer | |
1838 | * provided. They also supply outbound data--parameters for | |
1839 | * the object method. Currently if this is present it will | |
1840 | * be a snapshot id. | |
1841 | */ | |
1842 | page_count = (u32) calc_pages_for(0, inbound_size); | |
1843 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
1844 | if (IS_ERR(pages)) | |
1845 | return PTR_ERR(pages); | |
1846 | ||
1847 | ret = -ENOMEM; | |
1848 | obj_request = rbd_obj_request_create(object_name, 0, 0, | |
1849 | OBJ_REQUEST_PAGES); | |
1850 | if (!obj_request) | |
1851 | goto out; | |
1852 | ||
1853 | obj_request->pages = pages; | |
1854 | obj_request->page_count = page_count; | |
1855 | ||
1856 | op = rbd_osd_req_op_create(CEPH_OSD_OP_CALL, class_name, | |
1857 | method_name, outbound, outbound_size); | |
1858 | if (!op) | |
1859 | goto out; | |
1860 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
1861 | obj_request, op); | |
1862 | rbd_osd_req_op_destroy(op); | |
1863 | if (!obj_request->osd_req) | |
1864 | goto out; | |
1865 | ||
1866 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1867 | ret = rbd_obj_request_submit(osdc, obj_request); | |
1868 | if (ret) | |
1869 | goto out; | |
1870 | ret = rbd_obj_request_wait(obj_request); | |
1871 | if (ret) | |
1872 | goto out; | |
1873 | ||
1874 | ret = obj_request->result; | |
1875 | if (ret < 0) | |
1876 | goto out; | |
1877 | ret = ceph_copy_from_page_vector(pages, inbound, 0, | |
1878 | obj_request->xferred); | |
1879 | if (version) | |
1880 | *version = obj_request->version; | |
1881 | out: | |
1882 | if (obj_request) | |
1883 | rbd_obj_request_put(obj_request); | |
1884 | else | |
1885 | ceph_release_page_vector(pages, page_count); | |
1886 | ||
1887 | return ret; | |
1888 | } | |
1889 | ||
bf0d5f50 AE |
1890 | static void rbd_request_fn(struct request_queue *q) |
1891 | { | |
1892 | struct rbd_device *rbd_dev = q->queuedata; | |
1893 | bool read_only = rbd_dev->mapping.read_only; | |
1894 | struct request *rq; | |
1895 | int result; | |
1896 | ||
1897 | while ((rq = blk_fetch_request(q))) { | |
1898 | bool write_request = rq_data_dir(rq) == WRITE; | |
1899 | struct rbd_img_request *img_request; | |
1900 | u64 offset; | |
1901 | u64 length; | |
1902 | ||
1903 | /* Ignore any non-FS requests that filter through. */ | |
1904 | ||
1905 | if (rq->cmd_type != REQ_TYPE_FS) { | |
1906 | __blk_end_request_all(rq, 0); | |
1907 | continue; | |
1908 | } | |
1909 | ||
1910 | spin_unlock_irq(q->queue_lock); | |
1911 | ||
1912 | /* Disallow writes to a read-only device */ | |
1913 | ||
1914 | if (write_request) { | |
1915 | result = -EROFS; | |
1916 | if (read_only) | |
1917 | goto end_request; | |
1918 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
1919 | } | |
1920 | ||
6d292906 AE |
1921 | /* |
1922 | * Quit early if the mapped snapshot no longer | |
1923 | * exists. It's still possible the snapshot will | |
1924 | * have disappeared by the time our request arrives | |
1925 | * at the osd, but there's no sense in sending it if | |
1926 | * we already know. | |
1927 | */ | |
1928 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
1929 | dout("request for non-existent snapshot"); |
1930 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
1931 | result = -ENXIO; | |
1932 | goto end_request; | |
1933 | } | |
1934 | ||
1935 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
1936 | length = (u64) blk_rq_bytes(rq); | |
1937 | ||
1938 | result = -EINVAL; | |
1939 | if (WARN_ON(offset && length > U64_MAX - offset + 1)) | |
1940 | goto end_request; /* Shouldn't happen */ | |
1941 | ||
1942 | result = -ENOMEM; | |
1943 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
1944 | write_request); | |
1945 | if (!img_request) | |
1946 | goto end_request; | |
1947 | ||
1948 | img_request->rq = rq; | |
1949 | ||
1950 | result = rbd_img_request_fill_bio(img_request, rq->bio); | |
1951 | if (!result) | |
1952 | result = rbd_img_request_submit(img_request); | |
1953 | if (result) | |
1954 | rbd_img_request_put(img_request); | |
1955 | end_request: | |
1956 | spin_lock_irq(q->queue_lock); | |
1957 | if (result < 0) { | |
1958 | rbd_warn(rbd_dev, "obj_request %s result %d\n", | |
1959 | write_request ? "write" : "read", result); | |
1960 | __blk_end_request_all(rq, result); | |
1961 | } | |
1962 | } | |
1963 | } | |
1964 | ||
602adf40 YS |
1965 | /* |
1966 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1967 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 1968 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
1969 | */ |
1970 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1971 | struct bio_vec *bvec) | |
1972 | { | |
1973 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
1974 | sector_t sector_offset; |
1975 | sector_t sectors_per_obj; | |
1976 | sector_t obj_sector_offset; | |
1977 | int ret; | |
1978 | ||
1979 | /* | |
1980 | * Find how far into its rbd object the partition-relative | |
1981 | * bio start sector is to offset relative to the enclosing | |
1982 | * device. | |
1983 | */ | |
1984 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
1985 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
1986 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
1987 | ||
1988 | /* | |
1989 | * Compute the number of bytes from that offset to the end | |
1990 | * of the object. Account for what's already used by the bio. | |
1991 | */ | |
1992 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
1993 | if (ret > bmd->bi_size) | |
1994 | ret -= bmd->bi_size; | |
1995 | else | |
1996 | ret = 0; | |
1997 | ||
1998 | /* | |
1999 | * Don't send back more than was asked for. And if the bio | |
2000 | * was empty, let the whole thing through because: "Note | |
2001 | * that a block device *must* allow a single page to be | |
2002 | * added to an empty bio." | |
2003 | */ | |
2004 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2005 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2006 | ret = (int) bvec->bv_len; | |
2007 | ||
2008 | return ret; | |
602adf40 YS |
2009 | } |
2010 | ||
2011 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2012 | { | |
2013 | struct gendisk *disk = rbd_dev->disk; | |
2014 | ||
2015 | if (!disk) | |
2016 | return; | |
2017 | ||
602adf40 YS |
2018 | if (disk->flags & GENHD_FL_UP) |
2019 | del_gendisk(disk); | |
2020 | if (disk->queue) | |
2021 | blk_cleanup_queue(disk->queue); | |
2022 | put_disk(disk); | |
2023 | } | |
2024 | ||
788e2df3 AE |
2025 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2026 | const char *object_name, | |
2027 | u64 offset, u64 length, | |
2028 | char *buf, u64 *version) | |
2029 | ||
2030 | { | |
2031 | struct ceph_osd_req_op *op; | |
2032 | struct rbd_obj_request *obj_request; | |
2033 | struct ceph_osd_client *osdc; | |
2034 | struct page **pages = NULL; | |
2035 | u32 page_count; | |
2036 | int ret; | |
2037 | ||
2038 | page_count = (u32) calc_pages_for(offset, length); | |
2039 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2040 | if (IS_ERR(pages)) | |
2041 | ret = PTR_ERR(pages); | |
2042 | ||
2043 | ret = -ENOMEM; | |
2044 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2045 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2046 | if (!obj_request) |
2047 | goto out; | |
2048 | ||
2049 | obj_request->pages = pages; | |
2050 | obj_request->page_count = page_count; | |
2051 | ||
2052 | op = rbd_osd_req_op_create(CEPH_OSD_OP_READ, offset, length); | |
2053 | if (!op) | |
2054 | goto out; | |
2055 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2056 | obj_request, op); | |
2057 | rbd_osd_req_op_destroy(op); | |
2058 | if (!obj_request->osd_req) | |
2059 | goto out; | |
2060 | ||
2061 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2062 | ret = rbd_obj_request_submit(osdc, obj_request); | |
2063 | if (ret) | |
2064 | goto out; | |
2065 | ret = rbd_obj_request_wait(obj_request); | |
2066 | if (ret) | |
2067 | goto out; | |
2068 | ||
2069 | ret = obj_request->result; | |
2070 | if (ret < 0) | |
2071 | goto out; | |
2072 | ret = ceph_copy_from_page_vector(pages, buf, 0, obj_request->xferred); | |
2073 | if (version) | |
2074 | *version = obj_request->version; | |
2075 | out: | |
2076 | if (obj_request) | |
2077 | rbd_obj_request_put(obj_request); | |
2078 | else | |
2079 | ceph_release_page_vector(pages, page_count); | |
2080 | ||
2081 | return ret; | |
2082 | } | |
2083 | ||
602adf40 | 2084 | /* |
4156d998 AE |
2085 | * Read the complete header for the given rbd device. |
2086 | * | |
2087 | * Returns a pointer to a dynamically-allocated buffer containing | |
2088 | * the complete and validated header. Caller can pass the address | |
2089 | * of a variable that will be filled in with the version of the | |
2090 | * header object at the time it was read. | |
2091 | * | |
2092 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2093 | */ |
4156d998 AE |
2094 | static struct rbd_image_header_ondisk * |
2095 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 2096 | { |
4156d998 | 2097 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2098 | u32 snap_count = 0; |
4156d998 AE |
2099 | u64 names_size = 0; |
2100 | u32 want_count; | |
2101 | int ret; | |
602adf40 | 2102 | |
00f1f36f | 2103 | /* |
4156d998 AE |
2104 | * The complete header will include an array of its 64-bit |
2105 | * snapshot ids, followed by the names of those snapshots as | |
2106 | * a contiguous block of NUL-terminated strings. Note that | |
2107 | * the number of snapshots could change by the time we read | |
2108 | * it in, in which case we re-read it. | |
00f1f36f | 2109 | */ |
4156d998 AE |
2110 | do { |
2111 | size_t size; | |
2112 | ||
2113 | kfree(ondisk); | |
2114 | ||
2115 | size = sizeof (*ondisk); | |
2116 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
2117 | size += names_size; | |
2118 | ondisk = kmalloc(size, GFP_KERNEL); | |
2119 | if (!ondisk) | |
2120 | return ERR_PTR(-ENOMEM); | |
2121 | ||
788e2df3 | 2122 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
4156d998 AE |
2123 | 0, size, |
2124 | (char *) ondisk, version); | |
2125 | ||
2126 | if (ret < 0) | |
2127 | goto out_err; | |
2128 | if (WARN_ON((size_t) ret < size)) { | |
2129 | ret = -ENXIO; | |
06ecc6cb AE |
2130 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2131 | size, ret); | |
4156d998 AE |
2132 | goto out_err; |
2133 | } | |
2134 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
2135 | ret = -ENXIO; | |
06ecc6cb | 2136 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 2137 | goto out_err; |
81e759fb | 2138 | } |
602adf40 | 2139 | |
4156d998 AE |
2140 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2141 | want_count = snap_count; | |
2142 | snap_count = le32_to_cpu(ondisk->snap_count); | |
2143 | } while (snap_count != want_count); | |
00f1f36f | 2144 | |
4156d998 | 2145 | return ondisk; |
00f1f36f | 2146 | |
4156d998 AE |
2147 | out_err: |
2148 | kfree(ondisk); | |
2149 | ||
2150 | return ERR_PTR(ret); | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * reload the ondisk the header | |
2155 | */ | |
2156 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
2157 | struct rbd_image_header *header) | |
2158 | { | |
2159 | struct rbd_image_header_ondisk *ondisk; | |
2160 | u64 ver = 0; | |
2161 | int ret; | |
602adf40 | 2162 | |
4156d998 AE |
2163 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
2164 | if (IS_ERR(ondisk)) | |
2165 | return PTR_ERR(ondisk); | |
2166 | ret = rbd_header_from_disk(header, ondisk); | |
2167 | if (ret >= 0) | |
2168 | header->obj_version = ver; | |
2169 | kfree(ondisk); | |
2170 | ||
2171 | return ret; | |
602adf40 YS |
2172 | } |
2173 | ||
41f38c2b | 2174 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
2175 | { |
2176 | struct rbd_snap *snap; | |
a0593290 | 2177 | struct rbd_snap *next; |
dfc5606d | 2178 | |
a0593290 | 2179 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
41f38c2b | 2180 | rbd_remove_snap_dev(snap); |
dfc5606d YS |
2181 | } |
2182 | ||
9478554a AE |
2183 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
2184 | { | |
2185 | sector_t size; | |
2186 | ||
0d7dbfce | 2187 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
2188 | return; |
2189 | ||
2190 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
2191 | dout("setting size to %llu sectors", (unsigned long long) size); | |
2192 | rbd_dev->mapping.size = (u64) size; | |
2193 | set_capacity(rbd_dev->disk, size); | |
2194 | } | |
2195 | ||
602adf40 YS |
2196 | /* |
2197 | * only read the first part of the ondisk header, without the snaps info | |
2198 | */ | |
117973fb | 2199 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
2200 | { |
2201 | int ret; | |
2202 | struct rbd_image_header h; | |
602adf40 YS |
2203 | |
2204 | ret = rbd_read_header(rbd_dev, &h); | |
2205 | if (ret < 0) | |
2206 | return ret; | |
2207 | ||
a51aa0c0 JD |
2208 | down_write(&rbd_dev->header_rwsem); |
2209 | ||
9478554a AE |
2210 | /* Update image size, and check for resize of mapped image */ |
2211 | rbd_dev->header.image_size = h.image_size; | |
2212 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 2213 | |
849b4260 | 2214 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 2215 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 2216 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
2217 | /* osd requests may still refer to snapc */ |
2218 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 2219 | |
b813623a AE |
2220 | if (hver) |
2221 | *hver = h.obj_version; | |
a71b891b | 2222 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 2223 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
2224 | rbd_dev->header.snapc = h.snapc; |
2225 | rbd_dev->header.snap_names = h.snap_names; | |
2226 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
2227 | /* Free the extra copy of the object prefix */ |
2228 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
2229 | kfree(h.object_prefix); | |
2230 | ||
304f6808 AE |
2231 | ret = rbd_dev_snaps_update(rbd_dev); |
2232 | if (!ret) | |
2233 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 2234 | |
c666601a | 2235 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 2236 | |
dfc5606d | 2237 | return ret; |
602adf40 YS |
2238 | } |
2239 | ||
117973fb | 2240 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
1fe5e993 AE |
2241 | { |
2242 | int ret; | |
2243 | ||
117973fb | 2244 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1fe5e993 | 2245 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb AE |
2246 | if (rbd_dev->image_format == 1) |
2247 | ret = rbd_dev_v1_refresh(rbd_dev, hver); | |
2248 | else | |
2249 | ret = rbd_dev_v2_refresh(rbd_dev, hver); | |
1fe5e993 AE |
2250 | mutex_unlock(&ctl_mutex); |
2251 | ||
2252 | return ret; | |
2253 | } | |
2254 | ||
602adf40 YS |
2255 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
2256 | { | |
2257 | struct gendisk *disk; | |
2258 | struct request_queue *q; | |
593a9e7b | 2259 | u64 segment_size; |
602adf40 | 2260 | |
602adf40 | 2261 | /* create gendisk info */ |
602adf40 YS |
2262 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
2263 | if (!disk) | |
1fcdb8aa | 2264 | return -ENOMEM; |
602adf40 | 2265 | |
f0f8cef5 | 2266 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 2267 | rbd_dev->dev_id); |
602adf40 YS |
2268 | disk->major = rbd_dev->major; |
2269 | disk->first_minor = 0; | |
2270 | disk->fops = &rbd_bd_ops; | |
2271 | disk->private_data = rbd_dev; | |
2272 | ||
bf0d5f50 | 2273 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
2274 | if (!q) |
2275 | goto out_disk; | |
029bcbd8 | 2276 | |
593a9e7b AE |
2277 | /* We use the default size, but let's be explicit about it. */ |
2278 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
2279 | ||
029bcbd8 | 2280 | /* set io sizes to object size */ |
593a9e7b AE |
2281 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
2282 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
2283 | blk_queue_max_segment_size(q, segment_size); | |
2284 | blk_queue_io_min(q, segment_size); | |
2285 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 2286 | |
602adf40 YS |
2287 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
2288 | disk->queue = q; | |
2289 | ||
2290 | q->queuedata = rbd_dev; | |
2291 | ||
2292 | rbd_dev->disk = disk; | |
602adf40 | 2293 | |
12f02944 AE |
2294 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
2295 | ||
602adf40 | 2296 | return 0; |
602adf40 YS |
2297 | out_disk: |
2298 | put_disk(disk); | |
1fcdb8aa AE |
2299 | |
2300 | return -ENOMEM; | |
602adf40 YS |
2301 | } |
2302 | ||
dfc5606d YS |
2303 | /* |
2304 | sysfs | |
2305 | */ | |
2306 | ||
593a9e7b AE |
2307 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
2308 | { | |
2309 | return container_of(dev, struct rbd_device, dev); | |
2310 | } | |
2311 | ||
dfc5606d YS |
2312 | static ssize_t rbd_size_show(struct device *dev, |
2313 | struct device_attribute *attr, char *buf) | |
2314 | { | |
593a9e7b | 2315 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
2316 | sector_t size; |
2317 | ||
2318 | down_read(&rbd_dev->header_rwsem); | |
2319 | size = get_capacity(rbd_dev->disk); | |
2320 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 2321 | |
a51aa0c0 | 2322 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
2323 | } |
2324 | ||
34b13184 AE |
2325 | /* |
2326 | * Note this shows the features for whatever's mapped, which is not | |
2327 | * necessarily the base image. | |
2328 | */ | |
2329 | static ssize_t rbd_features_show(struct device *dev, | |
2330 | struct device_attribute *attr, char *buf) | |
2331 | { | |
2332 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2333 | ||
2334 | return sprintf(buf, "0x%016llx\n", | |
2335 | (unsigned long long) rbd_dev->mapping.features); | |
2336 | } | |
2337 | ||
dfc5606d YS |
2338 | static ssize_t rbd_major_show(struct device *dev, |
2339 | struct device_attribute *attr, char *buf) | |
2340 | { | |
593a9e7b | 2341 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 2342 | |
dfc5606d YS |
2343 | return sprintf(buf, "%d\n", rbd_dev->major); |
2344 | } | |
2345 | ||
2346 | static ssize_t rbd_client_id_show(struct device *dev, | |
2347 | struct device_attribute *attr, char *buf) | |
602adf40 | 2348 | { |
593a9e7b | 2349 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2350 | |
1dbb4399 AE |
2351 | return sprintf(buf, "client%lld\n", |
2352 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
2353 | } |
2354 | ||
dfc5606d YS |
2355 | static ssize_t rbd_pool_show(struct device *dev, |
2356 | struct device_attribute *attr, char *buf) | |
602adf40 | 2357 | { |
593a9e7b | 2358 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2359 | |
0d7dbfce | 2360 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
2361 | } |
2362 | ||
9bb2f334 AE |
2363 | static ssize_t rbd_pool_id_show(struct device *dev, |
2364 | struct device_attribute *attr, char *buf) | |
2365 | { | |
2366 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2367 | ||
0d7dbfce AE |
2368 | return sprintf(buf, "%llu\n", |
2369 | (unsigned long long) rbd_dev->spec->pool_id); | |
9bb2f334 AE |
2370 | } |
2371 | ||
dfc5606d YS |
2372 | static ssize_t rbd_name_show(struct device *dev, |
2373 | struct device_attribute *attr, char *buf) | |
2374 | { | |
593a9e7b | 2375 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2376 | |
a92ffdf8 AE |
2377 | if (rbd_dev->spec->image_name) |
2378 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
2379 | ||
2380 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
2381 | } |
2382 | ||
589d30e0 AE |
2383 | static ssize_t rbd_image_id_show(struct device *dev, |
2384 | struct device_attribute *attr, char *buf) | |
2385 | { | |
2386 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2387 | ||
0d7dbfce | 2388 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
2389 | } |
2390 | ||
34b13184 AE |
2391 | /* |
2392 | * Shows the name of the currently-mapped snapshot (or | |
2393 | * RBD_SNAP_HEAD_NAME for the base image). | |
2394 | */ | |
dfc5606d YS |
2395 | static ssize_t rbd_snap_show(struct device *dev, |
2396 | struct device_attribute *attr, | |
2397 | char *buf) | |
2398 | { | |
593a9e7b | 2399 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 2400 | |
0d7dbfce | 2401 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
2402 | } |
2403 | ||
86b00e0d AE |
2404 | /* |
2405 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
2406 | * for the parent image. If there is no parent, simply shows | |
2407 | * "(no parent image)". | |
2408 | */ | |
2409 | static ssize_t rbd_parent_show(struct device *dev, | |
2410 | struct device_attribute *attr, | |
2411 | char *buf) | |
2412 | { | |
2413 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
2414 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
2415 | int count; | |
2416 | char *bufp = buf; | |
2417 | ||
2418 | if (!spec) | |
2419 | return sprintf(buf, "(no parent image)\n"); | |
2420 | ||
2421 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
2422 | (unsigned long long) spec->pool_id, spec->pool_name); | |
2423 | if (count < 0) | |
2424 | return count; | |
2425 | bufp += count; | |
2426 | ||
2427 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
2428 | spec->image_name ? spec->image_name : "(unknown)"); | |
2429 | if (count < 0) | |
2430 | return count; | |
2431 | bufp += count; | |
2432 | ||
2433 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
2434 | (unsigned long long) spec->snap_id, spec->snap_name); | |
2435 | if (count < 0) | |
2436 | return count; | |
2437 | bufp += count; | |
2438 | ||
2439 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
2440 | if (count < 0) | |
2441 | return count; | |
2442 | bufp += count; | |
2443 | ||
2444 | return (ssize_t) (bufp - buf); | |
2445 | } | |
2446 | ||
dfc5606d YS |
2447 | static ssize_t rbd_image_refresh(struct device *dev, |
2448 | struct device_attribute *attr, | |
2449 | const char *buf, | |
2450 | size_t size) | |
2451 | { | |
593a9e7b | 2452 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 2453 | int ret; |
602adf40 | 2454 | |
117973fb | 2455 | ret = rbd_dev_refresh(rbd_dev, NULL); |
b813623a AE |
2456 | |
2457 | return ret < 0 ? ret : size; | |
dfc5606d | 2458 | } |
602adf40 | 2459 | |
dfc5606d | 2460 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 2461 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
2462 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
2463 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
2464 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 2465 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 2466 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 2467 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
2468 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
2469 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 2470 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
2471 | |
2472 | static struct attribute *rbd_attrs[] = { | |
2473 | &dev_attr_size.attr, | |
34b13184 | 2474 | &dev_attr_features.attr, |
dfc5606d YS |
2475 | &dev_attr_major.attr, |
2476 | &dev_attr_client_id.attr, | |
2477 | &dev_attr_pool.attr, | |
9bb2f334 | 2478 | &dev_attr_pool_id.attr, |
dfc5606d | 2479 | &dev_attr_name.attr, |
589d30e0 | 2480 | &dev_attr_image_id.attr, |
dfc5606d | 2481 | &dev_attr_current_snap.attr, |
86b00e0d | 2482 | &dev_attr_parent.attr, |
dfc5606d | 2483 | &dev_attr_refresh.attr, |
dfc5606d YS |
2484 | NULL |
2485 | }; | |
2486 | ||
2487 | static struct attribute_group rbd_attr_group = { | |
2488 | .attrs = rbd_attrs, | |
2489 | }; | |
2490 | ||
2491 | static const struct attribute_group *rbd_attr_groups[] = { | |
2492 | &rbd_attr_group, | |
2493 | NULL | |
2494 | }; | |
2495 | ||
2496 | static void rbd_sysfs_dev_release(struct device *dev) | |
2497 | { | |
2498 | } | |
2499 | ||
2500 | static struct device_type rbd_device_type = { | |
2501 | .name = "rbd", | |
2502 | .groups = rbd_attr_groups, | |
2503 | .release = rbd_sysfs_dev_release, | |
2504 | }; | |
2505 | ||
2506 | ||
2507 | /* | |
2508 | sysfs - snapshots | |
2509 | */ | |
2510 | ||
2511 | static ssize_t rbd_snap_size_show(struct device *dev, | |
2512 | struct device_attribute *attr, | |
2513 | char *buf) | |
2514 | { | |
2515 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2516 | ||
3591538f | 2517 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
2518 | } |
2519 | ||
2520 | static ssize_t rbd_snap_id_show(struct device *dev, | |
2521 | struct device_attribute *attr, | |
2522 | char *buf) | |
2523 | { | |
2524 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2525 | ||
3591538f | 2526 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
2527 | } |
2528 | ||
34b13184 AE |
2529 | static ssize_t rbd_snap_features_show(struct device *dev, |
2530 | struct device_attribute *attr, | |
2531 | char *buf) | |
2532 | { | |
2533 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2534 | ||
2535 | return sprintf(buf, "0x%016llx\n", | |
2536 | (unsigned long long) snap->features); | |
2537 | } | |
2538 | ||
dfc5606d YS |
2539 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
2540 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 2541 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
2542 | |
2543 | static struct attribute *rbd_snap_attrs[] = { | |
2544 | &dev_attr_snap_size.attr, | |
2545 | &dev_attr_snap_id.attr, | |
34b13184 | 2546 | &dev_attr_snap_features.attr, |
dfc5606d YS |
2547 | NULL, |
2548 | }; | |
2549 | ||
2550 | static struct attribute_group rbd_snap_attr_group = { | |
2551 | .attrs = rbd_snap_attrs, | |
2552 | }; | |
2553 | ||
2554 | static void rbd_snap_dev_release(struct device *dev) | |
2555 | { | |
2556 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
2557 | kfree(snap->name); | |
2558 | kfree(snap); | |
2559 | } | |
2560 | ||
2561 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
2562 | &rbd_snap_attr_group, | |
2563 | NULL | |
2564 | }; | |
2565 | ||
2566 | static struct device_type rbd_snap_device_type = { | |
2567 | .groups = rbd_snap_attr_groups, | |
2568 | .release = rbd_snap_dev_release, | |
2569 | }; | |
2570 | ||
8b8fb99c AE |
2571 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
2572 | { | |
2573 | kref_get(&spec->kref); | |
2574 | ||
2575 | return spec; | |
2576 | } | |
2577 | ||
2578 | static void rbd_spec_free(struct kref *kref); | |
2579 | static void rbd_spec_put(struct rbd_spec *spec) | |
2580 | { | |
2581 | if (spec) | |
2582 | kref_put(&spec->kref, rbd_spec_free); | |
2583 | } | |
2584 | ||
2585 | static struct rbd_spec *rbd_spec_alloc(void) | |
2586 | { | |
2587 | struct rbd_spec *spec; | |
2588 | ||
2589 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
2590 | if (!spec) | |
2591 | return NULL; | |
2592 | kref_init(&spec->kref); | |
2593 | ||
2594 | rbd_spec_put(rbd_spec_get(spec)); /* TEMPORARY */ | |
2595 | ||
2596 | return spec; | |
2597 | } | |
2598 | ||
2599 | static void rbd_spec_free(struct kref *kref) | |
2600 | { | |
2601 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
2602 | ||
2603 | kfree(spec->pool_name); | |
2604 | kfree(spec->image_id); | |
2605 | kfree(spec->image_name); | |
2606 | kfree(spec->snap_name); | |
2607 | kfree(spec); | |
2608 | } | |
2609 | ||
c53d5893 AE |
2610 | struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
2611 | struct rbd_spec *spec) | |
2612 | { | |
2613 | struct rbd_device *rbd_dev; | |
2614 | ||
2615 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
2616 | if (!rbd_dev) | |
2617 | return NULL; | |
2618 | ||
2619 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 2620 | rbd_dev->flags = 0; |
c53d5893 AE |
2621 | INIT_LIST_HEAD(&rbd_dev->node); |
2622 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
2623 | init_rwsem(&rbd_dev->header_rwsem); | |
2624 | ||
2625 | rbd_dev->spec = spec; | |
2626 | rbd_dev->rbd_client = rbdc; | |
2627 | ||
0903e875 AE |
2628 | /* Initialize the layout used for all rbd requests */ |
2629 | ||
2630 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
2631 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
2632 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
2633 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
2634 | ||
c53d5893 AE |
2635 | return rbd_dev; |
2636 | } | |
2637 | ||
2638 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
2639 | { | |
86b00e0d | 2640 | rbd_spec_put(rbd_dev->parent_spec); |
c53d5893 AE |
2641 | kfree(rbd_dev->header_name); |
2642 | rbd_put_client(rbd_dev->rbd_client); | |
2643 | rbd_spec_put(rbd_dev->spec); | |
2644 | kfree(rbd_dev); | |
2645 | } | |
2646 | ||
304f6808 AE |
2647 | static bool rbd_snap_registered(struct rbd_snap *snap) |
2648 | { | |
2649 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
2650 | bool reg = device_is_registered(&snap->dev); | |
2651 | ||
2652 | rbd_assert(!ret ^ reg); | |
2653 | ||
2654 | return ret; | |
2655 | } | |
2656 | ||
41f38c2b | 2657 | static void rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
2658 | { |
2659 | list_del(&snap->node); | |
304f6808 AE |
2660 | if (device_is_registered(&snap->dev)) |
2661 | device_unregister(&snap->dev); | |
dfc5606d YS |
2662 | } |
2663 | ||
14e7085d | 2664 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
2665 | struct device *parent) |
2666 | { | |
2667 | struct device *dev = &snap->dev; | |
2668 | int ret; | |
2669 | ||
2670 | dev->type = &rbd_snap_device_type; | |
2671 | dev->parent = parent; | |
2672 | dev->release = rbd_snap_dev_release; | |
d4b125e9 | 2673 | dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); |
304f6808 AE |
2674 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
2675 | ||
dfc5606d YS |
2676 | ret = device_register(dev); |
2677 | ||
2678 | return ret; | |
2679 | } | |
2680 | ||
4e891e0a | 2681 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 2682 | const char *snap_name, |
34b13184 AE |
2683 | u64 snap_id, u64 snap_size, |
2684 | u64 snap_features) | |
dfc5606d | 2685 | { |
4e891e0a | 2686 | struct rbd_snap *snap; |
dfc5606d | 2687 | int ret; |
4e891e0a AE |
2688 | |
2689 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 2690 | if (!snap) |
4e891e0a AE |
2691 | return ERR_PTR(-ENOMEM); |
2692 | ||
2693 | ret = -ENOMEM; | |
c8d18425 | 2694 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
2695 | if (!snap->name) |
2696 | goto err; | |
2697 | ||
c8d18425 AE |
2698 | snap->id = snap_id; |
2699 | snap->size = snap_size; | |
34b13184 | 2700 | snap->features = snap_features; |
4e891e0a AE |
2701 | |
2702 | return snap; | |
2703 | ||
dfc5606d YS |
2704 | err: |
2705 | kfree(snap->name); | |
2706 | kfree(snap); | |
4e891e0a AE |
2707 | |
2708 | return ERR_PTR(ret); | |
dfc5606d YS |
2709 | } |
2710 | ||
cd892126 AE |
2711 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
2712 | u64 *snap_size, u64 *snap_features) | |
2713 | { | |
2714 | char *snap_name; | |
2715 | ||
2716 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
2717 | ||
2718 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
2719 | *snap_features = 0; /* No features for v1 */ | |
2720 | ||
2721 | /* Skip over names until we find the one we are looking for */ | |
2722 | ||
2723 | snap_name = rbd_dev->header.snap_names; | |
2724 | while (which--) | |
2725 | snap_name += strlen(snap_name) + 1; | |
2726 | ||
2727 | return snap_name; | |
2728 | } | |
2729 | ||
9d475de5 AE |
2730 | /* |
2731 | * Get the size and object order for an image snapshot, or if | |
2732 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
2733 | * image. | |
2734 | */ | |
2735 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
2736 | u8 *order, u64 *snap_size) | |
2737 | { | |
2738 | __le64 snapid = cpu_to_le64(snap_id); | |
2739 | int ret; | |
2740 | struct { | |
2741 | u8 order; | |
2742 | __le64 size; | |
2743 | } __attribute__ ((packed)) size_buf = { 0 }; | |
2744 | ||
36be9a76 | 2745 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 AE |
2746 | "rbd", "get_size", |
2747 | (char *) &snapid, sizeof (snapid), | |
07b2391f | 2748 | (char *) &size_buf, sizeof (size_buf), NULL); |
36be9a76 | 2749 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
2750 | if (ret < 0) |
2751 | return ret; | |
2752 | ||
2753 | *order = size_buf.order; | |
2754 | *snap_size = le64_to_cpu(size_buf.size); | |
2755 | ||
2756 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
2757 | (unsigned long long) snap_id, (unsigned int) *order, | |
2758 | (unsigned long long) *snap_size); | |
2759 | ||
2760 | return 0; | |
2761 | } | |
2762 | ||
2763 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
2764 | { | |
2765 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
2766 | &rbd_dev->header.obj_order, | |
2767 | &rbd_dev->header.image_size); | |
2768 | } | |
2769 | ||
1e130199 AE |
2770 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
2771 | { | |
2772 | void *reply_buf; | |
2773 | int ret; | |
2774 | void *p; | |
2775 | ||
2776 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
2777 | if (!reply_buf) | |
2778 | return -ENOMEM; | |
2779 | ||
36be9a76 | 2780 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
1e130199 AE |
2781 | "rbd", "get_object_prefix", |
2782 | NULL, 0, | |
07b2391f | 2783 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
36be9a76 | 2784 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
2785 | if (ret < 0) |
2786 | goto out; | |
36be9a76 | 2787 | ret = 0; /* rbd_obj_method_sync() can return positive */ |
1e130199 AE |
2788 | |
2789 | p = reply_buf; | |
2790 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
2791 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
2792 | NULL, GFP_NOIO); | |
2793 | ||
2794 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
2795 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
2796 | rbd_dev->header.object_prefix = NULL; | |
2797 | } else { | |
2798 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
2799 | } | |
2800 | ||
2801 | out: | |
2802 | kfree(reply_buf); | |
2803 | ||
2804 | return ret; | |
2805 | } | |
2806 | ||
b1b5402a AE |
2807 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
2808 | u64 *snap_features) | |
2809 | { | |
2810 | __le64 snapid = cpu_to_le64(snap_id); | |
2811 | struct { | |
2812 | __le64 features; | |
2813 | __le64 incompat; | |
2814 | } features_buf = { 0 }; | |
d889140c | 2815 | u64 incompat; |
b1b5402a AE |
2816 | int ret; |
2817 | ||
36be9a76 | 2818 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a AE |
2819 | "rbd", "get_features", |
2820 | (char *) &snapid, sizeof (snapid), | |
2821 | (char *) &features_buf, sizeof (features_buf), | |
07b2391f | 2822 | NULL); |
36be9a76 | 2823 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
2824 | if (ret < 0) |
2825 | return ret; | |
d889140c AE |
2826 | |
2827 | incompat = le64_to_cpu(features_buf.incompat); | |
2828 | if (incompat & ~RBD_FEATURES_ALL) | |
b8f5c6ed | 2829 | return -ENXIO; |
d889140c | 2830 | |
b1b5402a AE |
2831 | *snap_features = le64_to_cpu(features_buf.features); |
2832 | ||
2833 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
2834 | (unsigned long long) snap_id, | |
2835 | (unsigned long long) *snap_features, | |
2836 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
2837 | ||
2838 | return 0; | |
2839 | } | |
2840 | ||
2841 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
2842 | { | |
2843 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
2844 | &rbd_dev->header.features); | |
2845 | } | |
2846 | ||
86b00e0d AE |
2847 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
2848 | { | |
2849 | struct rbd_spec *parent_spec; | |
2850 | size_t size; | |
2851 | void *reply_buf = NULL; | |
2852 | __le64 snapid; | |
2853 | void *p; | |
2854 | void *end; | |
2855 | char *image_id; | |
2856 | u64 overlap; | |
86b00e0d AE |
2857 | int ret; |
2858 | ||
2859 | parent_spec = rbd_spec_alloc(); | |
2860 | if (!parent_spec) | |
2861 | return -ENOMEM; | |
2862 | ||
2863 | size = sizeof (__le64) + /* pool_id */ | |
2864 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
2865 | sizeof (__le64) + /* snap_id */ | |
2866 | sizeof (__le64); /* overlap */ | |
2867 | reply_buf = kmalloc(size, GFP_KERNEL); | |
2868 | if (!reply_buf) { | |
2869 | ret = -ENOMEM; | |
2870 | goto out_err; | |
2871 | } | |
2872 | ||
2873 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 2874 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d AE |
2875 | "rbd", "get_parent", |
2876 | (char *) &snapid, sizeof (snapid), | |
07b2391f | 2877 | (char *) reply_buf, size, NULL); |
36be9a76 | 2878 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
2879 | if (ret < 0) |
2880 | goto out_err; | |
2881 | ||
2882 | ret = -ERANGE; | |
2883 | p = reply_buf; | |
2884 | end = (char *) reply_buf + size; | |
2885 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); | |
2886 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
2887 | goto out; /* No parent? No problem. */ | |
2888 | ||
0903e875 AE |
2889 | /* The ceph file layout needs to fit pool id in 32 bits */ |
2890 | ||
2891 | ret = -EIO; | |
2892 | if (WARN_ON(parent_spec->pool_id > (u64) U32_MAX)) | |
2893 | goto out; | |
2894 | ||
979ed480 | 2895 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
2896 | if (IS_ERR(image_id)) { |
2897 | ret = PTR_ERR(image_id); | |
2898 | goto out_err; | |
2899 | } | |
2900 | parent_spec->image_id = image_id; | |
2901 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
2902 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
2903 | ||
2904 | rbd_dev->parent_overlap = overlap; | |
2905 | rbd_dev->parent_spec = parent_spec; | |
2906 | parent_spec = NULL; /* rbd_dev now owns this */ | |
2907 | out: | |
2908 | ret = 0; | |
2909 | out_err: | |
2910 | kfree(reply_buf); | |
2911 | rbd_spec_put(parent_spec); | |
2912 | ||
2913 | return ret; | |
2914 | } | |
2915 | ||
9e15b77d AE |
2916 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
2917 | { | |
2918 | size_t image_id_size; | |
2919 | char *image_id; | |
2920 | void *p; | |
2921 | void *end; | |
2922 | size_t size; | |
2923 | void *reply_buf = NULL; | |
2924 | size_t len = 0; | |
2925 | char *image_name = NULL; | |
2926 | int ret; | |
2927 | ||
2928 | rbd_assert(!rbd_dev->spec->image_name); | |
2929 | ||
69e7a02f AE |
2930 | len = strlen(rbd_dev->spec->image_id); |
2931 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
2932 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
2933 | if (!image_id) | |
2934 | return NULL; | |
2935 | ||
2936 | p = image_id; | |
2937 | end = (char *) image_id + image_id_size; | |
69e7a02f | 2938 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len); |
9e15b77d AE |
2939 | |
2940 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
2941 | reply_buf = kmalloc(size, GFP_KERNEL); | |
2942 | if (!reply_buf) | |
2943 | goto out; | |
2944 | ||
36be9a76 | 2945 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
2946 | "rbd", "dir_get_name", |
2947 | image_id, image_id_size, | |
07b2391f | 2948 | (char *) reply_buf, size, NULL); |
9e15b77d AE |
2949 | if (ret < 0) |
2950 | goto out; | |
2951 | p = reply_buf; | |
2952 | end = (char *) reply_buf + size; | |
2953 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); | |
2954 | if (IS_ERR(image_name)) | |
2955 | image_name = NULL; | |
2956 | else | |
2957 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
2958 | out: | |
2959 | kfree(reply_buf); | |
2960 | kfree(image_id); | |
2961 | ||
2962 | return image_name; | |
2963 | } | |
2964 | ||
2965 | /* | |
2966 | * When a parent image gets probed, we only have the pool, image, | |
2967 | * and snapshot ids but not the names of any of them. This call | |
2968 | * is made later to fill in those names. It has to be done after | |
2969 | * rbd_dev_snaps_update() has completed because some of the | |
2970 | * information (in particular, snapshot name) is not available | |
2971 | * until then. | |
2972 | */ | |
2973 | static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) | |
2974 | { | |
2975 | struct ceph_osd_client *osdc; | |
2976 | const char *name; | |
2977 | void *reply_buf = NULL; | |
2978 | int ret; | |
2979 | ||
2980 | if (rbd_dev->spec->pool_name) | |
2981 | return 0; /* Already have the names */ | |
2982 | ||
2983 | /* Look up the pool name */ | |
2984 | ||
2985 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2986 | name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); | |
935dc89f AE |
2987 | if (!name) { |
2988 | rbd_warn(rbd_dev, "there is no pool with id %llu", | |
2989 | rbd_dev->spec->pool_id); /* Really a BUG() */ | |
2990 | return -EIO; | |
2991 | } | |
9e15b77d AE |
2992 | |
2993 | rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); | |
2994 | if (!rbd_dev->spec->pool_name) | |
2995 | return -ENOMEM; | |
2996 | ||
2997 | /* Fetch the image name; tolerate failure here */ | |
2998 | ||
2999 | name = rbd_dev_image_name(rbd_dev); | |
69e7a02f | 3000 | if (name) |
9e15b77d | 3001 | rbd_dev->spec->image_name = (char *) name; |
69e7a02f | 3002 | else |
06ecc6cb | 3003 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d AE |
3004 | |
3005 | /* Look up the snapshot name. */ | |
3006 | ||
3007 | name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); | |
3008 | if (!name) { | |
935dc89f AE |
3009 | rbd_warn(rbd_dev, "no snapshot with id %llu", |
3010 | rbd_dev->spec->snap_id); /* Really a BUG() */ | |
9e15b77d AE |
3011 | ret = -EIO; |
3012 | goto out_err; | |
3013 | } | |
3014 | rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); | |
3015 | if(!rbd_dev->spec->snap_name) | |
3016 | goto out_err; | |
3017 | ||
3018 | return 0; | |
3019 | out_err: | |
3020 | kfree(reply_buf); | |
3021 | kfree(rbd_dev->spec->pool_name); | |
3022 | rbd_dev->spec->pool_name = NULL; | |
3023 | ||
3024 | return ret; | |
3025 | } | |
3026 | ||
6e14b1a6 | 3027 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
3028 | { |
3029 | size_t size; | |
3030 | int ret; | |
3031 | void *reply_buf; | |
3032 | void *p; | |
3033 | void *end; | |
3034 | u64 seq; | |
3035 | u32 snap_count; | |
3036 | struct ceph_snap_context *snapc; | |
3037 | u32 i; | |
3038 | ||
3039 | /* | |
3040 | * We'll need room for the seq value (maximum snapshot id), | |
3041 | * snapshot count, and array of that many snapshot ids. | |
3042 | * For now we have a fixed upper limit on the number we're | |
3043 | * prepared to receive. | |
3044 | */ | |
3045 | size = sizeof (__le64) + sizeof (__le32) + | |
3046 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3047 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3048 | if (!reply_buf) | |
3049 | return -ENOMEM; | |
3050 | ||
36be9a76 | 3051 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
35d489f9 AE |
3052 | "rbd", "get_snapcontext", |
3053 | NULL, 0, | |
07b2391f | 3054 | reply_buf, size, ver); |
36be9a76 | 3055 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3056 | if (ret < 0) |
3057 | goto out; | |
3058 | ||
3059 | ret = -ERANGE; | |
3060 | p = reply_buf; | |
3061 | end = (char *) reply_buf + size; | |
3062 | ceph_decode_64_safe(&p, end, seq, out); | |
3063 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3064 | ||
3065 | /* | |
3066 | * Make sure the reported number of snapshot ids wouldn't go | |
3067 | * beyond the end of our buffer. But before checking that, | |
3068 | * make sure the computed size of the snapshot context we | |
3069 | * allocate is representable in a size_t. | |
3070 | */ | |
3071 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3072 | / sizeof (u64)) { | |
3073 | ret = -EINVAL; | |
3074 | goto out; | |
3075 | } | |
3076 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3077 | goto out; | |
3078 | ||
3079 | size = sizeof (struct ceph_snap_context) + | |
3080 | snap_count * sizeof (snapc->snaps[0]); | |
3081 | snapc = kmalloc(size, GFP_KERNEL); | |
3082 | if (!snapc) { | |
3083 | ret = -ENOMEM; | |
3084 | goto out; | |
3085 | } | |
3086 | ||
3087 | atomic_set(&snapc->nref, 1); | |
3088 | snapc->seq = seq; | |
3089 | snapc->num_snaps = snap_count; | |
3090 | for (i = 0; i < snap_count; i++) | |
3091 | snapc->snaps[i] = ceph_decode_64(&p); | |
3092 | ||
3093 | rbd_dev->header.snapc = snapc; | |
3094 | ||
3095 | dout(" snap context seq = %llu, snap_count = %u\n", | |
3096 | (unsigned long long) seq, (unsigned int) snap_count); | |
3097 | ||
3098 | out: | |
3099 | kfree(reply_buf); | |
3100 | ||
3101 | return 0; | |
3102 | } | |
3103 | ||
b8b1e2db AE |
3104 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
3105 | { | |
3106 | size_t size; | |
3107 | void *reply_buf; | |
3108 | __le64 snap_id; | |
3109 | int ret; | |
3110 | void *p; | |
3111 | void *end; | |
b8b1e2db AE |
3112 | char *snap_name; |
3113 | ||
3114 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3115 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3116 | if (!reply_buf) | |
3117 | return ERR_PTR(-ENOMEM); | |
3118 | ||
3119 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
36be9a76 | 3120 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db AE |
3121 | "rbd", "get_snapshot_name", |
3122 | (char *) &snap_id, sizeof (snap_id), | |
07b2391f | 3123 | reply_buf, size, NULL); |
36be9a76 | 3124 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b8b1e2db AE |
3125 | if (ret < 0) |
3126 | goto out; | |
3127 | ||
3128 | p = reply_buf; | |
3129 | end = (char *) reply_buf + size; | |
e5c35534 | 3130 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
b8b1e2db AE |
3131 | if (IS_ERR(snap_name)) { |
3132 | ret = PTR_ERR(snap_name); | |
3133 | goto out; | |
3134 | } else { | |
3135 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
3136 | (unsigned long long) le64_to_cpu(snap_id), snap_name); | |
3137 | } | |
3138 | kfree(reply_buf); | |
3139 | ||
3140 | return snap_name; | |
3141 | out: | |
3142 | kfree(reply_buf); | |
3143 | ||
3144 | return ERR_PTR(ret); | |
3145 | } | |
3146 | ||
3147 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
3148 | u64 *snap_size, u64 *snap_features) | |
3149 | { | |
e0b49868 | 3150 | u64 snap_id; |
b8b1e2db AE |
3151 | u8 order; |
3152 | int ret; | |
3153 | ||
3154 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
3155 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
3156 | if (ret) | |
3157 | return ERR_PTR(ret); | |
3158 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
3159 | if (ret) | |
3160 | return ERR_PTR(ret); | |
3161 | ||
3162 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
3163 | } | |
3164 | ||
3165 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
3166 | u64 *snap_size, u64 *snap_features) | |
3167 | { | |
3168 | if (rbd_dev->image_format == 1) | |
3169 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
3170 | snap_size, snap_features); | |
3171 | if (rbd_dev->image_format == 2) | |
3172 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
3173 | snap_size, snap_features); | |
3174 | return ERR_PTR(-EINVAL); | |
3175 | } | |
3176 | ||
117973fb AE |
3177 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
3178 | { | |
3179 | int ret; | |
3180 | __u8 obj_order; | |
3181 | ||
3182 | down_write(&rbd_dev->header_rwsem); | |
3183 | ||
3184 | /* Grab old order first, to see if it changes */ | |
3185 | ||
3186 | obj_order = rbd_dev->header.obj_order, | |
3187 | ret = rbd_dev_v2_image_size(rbd_dev); | |
3188 | if (ret) | |
3189 | goto out; | |
3190 | if (rbd_dev->header.obj_order != obj_order) { | |
3191 | ret = -EIO; | |
3192 | goto out; | |
3193 | } | |
3194 | rbd_update_mapping_size(rbd_dev); | |
3195 | ||
3196 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); | |
3197 | dout("rbd_dev_v2_snap_context returned %d\n", ret); | |
3198 | if (ret) | |
3199 | goto out; | |
3200 | ret = rbd_dev_snaps_update(rbd_dev); | |
3201 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
3202 | if (ret) | |
3203 | goto out; | |
3204 | ret = rbd_dev_snaps_register(rbd_dev); | |
3205 | dout("rbd_dev_snaps_register returned %d\n", ret); | |
3206 | out: | |
3207 | up_write(&rbd_dev->header_rwsem); | |
3208 | ||
3209 | return ret; | |
3210 | } | |
3211 | ||
dfc5606d | 3212 | /* |
35938150 AE |
3213 | * Scan the rbd device's current snapshot list and compare it to the |
3214 | * newly-received snapshot context. Remove any existing snapshots | |
3215 | * not present in the new snapshot context. Add a new snapshot for | |
3216 | * any snaphots in the snapshot context not in the current list. | |
3217 | * And verify there are no changes to snapshots we already know | |
3218 | * about. | |
3219 | * | |
3220 | * Assumes the snapshots in the snapshot context are sorted by | |
3221 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
3222 | * are also maintained in that order.) | |
dfc5606d | 3223 | */ |
304f6808 | 3224 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 3225 | { |
35938150 AE |
3226 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
3227 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
3228 | struct list_head *head = &rbd_dev->snaps; |
3229 | struct list_head *links = head->next; | |
3230 | u32 index = 0; | |
dfc5606d | 3231 | |
9fcbb800 | 3232 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
3233 | while (index < snap_count || links != head) { |
3234 | u64 snap_id; | |
3235 | struct rbd_snap *snap; | |
cd892126 AE |
3236 | char *snap_name; |
3237 | u64 snap_size = 0; | |
3238 | u64 snap_features = 0; | |
dfc5606d | 3239 | |
35938150 AE |
3240 | snap_id = index < snap_count ? snapc->snaps[index] |
3241 | : CEPH_NOSNAP; | |
3242 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
3243 | : NULL; | |
aafb230e | 3244 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 3245 | |
35938150 AE |
3246 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
3247 | struct list_head *next = links->next; | |
dfc5606d | 3248 | |
6d292906 AE |
3249 | /* |
3250 | * A previously-existing snapshot is not in | |
3251 | * the new snap context. | |
3252 | * | |
3253 | * If the now missing snapshot is the one the | |
3254 | * image is mapped to, clear its exists flag | |
3255 | * so we can avoid sending any more requests | |
3256 | * to it. | |
3257 | */ | |
0d7dbfce | 3258 | if (rbd_dev->spec->snap_id == snap->id) |
6d292906 | 3259 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
41f38c2b | 3260 | rbd_remove_snap_dev(snap); |
9fcbb800 | 3261 | dout("%ssnap id %llu has been removed\n", |
0d7dbfce AE |
3262 | rbd_dev->spec->snap_id == snap->id ? |
3263 | "mapped " : "", | |
9fcbb800 | 3264 | (unsigned long long) snap->id); |
35938150 AE |
3265 | |
3266 | /* Done with this list entry; advance */ | |
3267 | ||
3268 | links = next; | |
dfc5606d YS |
3269 | continue; |
3270 | } | |
35938150 | 3271 | |
b8b1e2db AE |
3272 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
3273 | &snap_size, &snap_features); | |
cd892126 AE |
3274 | if (IS_ERR(snap_name)) |
3275 | return PTR_ERR(snap_name); | |
3276 | ||
9fcbb800 AE |
3277 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
3278 | (unsigned long long) snap_id); | |
35938150 AE |
3279 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
3280 | struct rbd_snap *new_snap; | |
3281 | ||
3282 | /* We haven't seen this snapshot before */ | |
3283 | ||
c8d18425 | 3284 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 3285 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
3286 | if (IS_ERR(new_snap)) { |
3287 | int err = PTR_ERR(new_snap); | |
3288 | ||
3289 | dout(" failed to add dev, error %d\n", err); | |
3290 | ||
3291 | return err; | |
3292 | } | |
35938150 AE |
3293 | |
3294 | /* New goes before existing, or at end of list */ | |
3295 | ||
9fcbb800 | 3296 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
3297 | if (snap) |
3298 | list_add_tail(&new_snap->node, &snap->node); | |
3299 | else | |
523f3258 | 3300 | list_add_tail(&new_snap->node, head); |
35938150 AE |
3301 | } else { |
3302 | /* Already have this one */ | |
3303 | ||
9fcbb800 AE |
3304 | dout(" already present\n"); |
3305 | ||
cd892126 | 3306 | rbd_assert(snap->size == snap_size); |
aafb230e | 3307 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 3308 | rbd_assert(snap->features == snap_features); |
35938150 AE |
3309 | |
3310 | /* Done with this list entry; advance */ | |
3311 | ||
3312 | links = links->next; | |
dfc5606d | 3313 | } |
35938150 AE |
3314 | |
3315 | /* Advance to the next entry in the snapshot context */ | |
3316 | ||
3317 | index++; | |
dfc5606d | 3318 | } |
9fcbb800 | 3319 | dout("%s: done\n", __func__); |
dfc5606d YS |
3320 | |
3321 | return 0; | |
3322 | } | |
3323 | ||
304f6808 AE |
3324 | /* |
3325 | * Scan the list of snapshots and register the devices for any that | |
3326 | * have not already been registered. | |
3327 | */ | |
3328 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
3329 | { | |
3330 | struct rbd_snap *snap; | |
3331 | int ret = 0; | |
3332 | ||
3333 | dout("%s called\n", __func__); | |
86ff77bb AE |
3334 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
3335 | return -EIO; | |
304f6808 AE |
3336 | |
3337 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
3338 | if (!rbd_snap_registered(snap)) { | |
3339 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
3340 | if (ret < 0) | |
3341 | break; | |
3342 | } | |
3343 | } | |
3344 | dout("%s: returning %d\n", __func__, ret); | |
3345 | ||
3346 | return ret; | |
3347 | } | |
3348 | ||
dfc5606d YS |
3349 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
3350 | { | |
dfc5606d | 3351 | struct device *dev; |
cd789ab9 | 3352 | int ret; |
dfc5606d YS |
3353 | |
3354 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 3355 | |
cd789ab9 | 3356 | dev = &rbd_dev->dev; |
dfc5606d YS |
3357 | dev->bus = &rbd_bus_type; |
3358 | dev->type = &rbd_device_type; | |
3359 | dev->parent = &rbd_root_dev; | |
3360 | dev->release = rbd_dev_release; | |
de71a297 | 3361 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 3362 | ret = device_register(dev); |
dfc5606d | 3363 | |
dfc5606d | 3364 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 3365 | |
dfc5606d | 3366 | return ret; |
602adf40 YS |
3367 | } |
3368 | ||
dfc5606d YS |
3369 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
3370 | { | |
3371 | device_unregister(&rbd_dev->dev); | |
3372 | } | |
3373 | ||
e2839308 | 3374 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
3375 | |
3376 | /* | |
499afd5b AE |
3377 | * Get a unique rbd identifier for the given new rbd_dev, and add |
3378 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 3379 | */ |
e2839308 | 3380 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 3381 | { |
e2839308 | 3382 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
3383 | |
3384 | spin_lock(&rbd_dev_list_lock); | |
3385 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
3386 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
3387 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
3388 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 3389 | } |
b7f23c36 | 3390 | |
1ddbe94e | 3391 | /* |
499afd5b AE |
3392 | * Remove an rbd_dev from the global list, and record that its |
3393 | * identifier is no longer in use. | |
1ddbe94e | 3394 | */ |
e2839308 | 3395 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 3396 | { |
d184f6bf | 3397 | struct list_head *tmp; |
de71a297 | 3398 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
3399 | int max_id; |
3400 | ||
aafb230e | 3401 | rbd_assert(rbd_id > 0); |
499afd5b | 3402 | |
e2839308 AE |
3403 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
3404 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
3405 | spin_lock(&rbd_dev_list_lock); |
3406 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
3407 | |
3408 | /* | |
3409 | * If the id being "put" is not the current maximum, there | |
3410 | * is nothing special we need to do. | |
3411 | */ | |
e2839308 | 3412 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
3413 | spin_unlock(&rbd_dev_list_lock); |
3414 | return; | |
3415 | } | |
3416 | ||
3417 | /* | |
3418 | * We need to update the current maximum id. Search the | |
3419 | * list to find out what it is. We're more likely to find | |
3420 | * the maximum at the end, so search the list backward. | |
3421 | */ | |
3422 | max_id = 0; | |
3423 | list_for_each_prev(tmp, &rbd_dev_list) { | |
3424 | struct rbd_device *rbd_dev; | |
3425 | ||
3426 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
3427 | if (rbd_dev->dev_id > max_id) |
3428 | max_id = rbd_dev->dev_id; | |
d184f6bf | 3429 | } |
499afd5b | 3430 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 3431 | |
1ddbe94e | 3432 | /* |
e2839308 | 3433 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
3434 | * which case it now accurately reflects the new maximum. |
3435 | * Be careful not to overwrite the maximum value in that | |
3436 | * case. | |
1ddbe94e | 3437 | */ |
e2839308 AE |
3438 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
3439 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
3440 | } |
3441 | ||
e28fff26 AE |
3442 | /* |
3443 | * Skips over white space at *buf, and updates *buf to point to the | |
3444 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
3445 | * the token (string of non-white space characters) found. Note |
3446 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
3447 | */ |
3448 | static inline size_t next_token(const char **buf) | |
3449 | { | |
3450 | /* | |
3451 | * These are the characters that produce nonzero for | |
3452 | * isspace() in the "C" and "POSIX" locales. | |
3453 | */ | |
3454 | const char *spaces = " \f\n\r\t\v"; | |
3455 | ||
3456 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
3457 | ||
3458 | return strcspn(*buf, spaces); /* Return token length */ | |
3459 | } | |
3460 | ||
3461 | /* | |
3462 | * Finds the next token in *buf, and if the provided token buffer is | |
3463 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
3464 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
3465 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
3466 | * |
3467 | * Returns the length of the token found (not including the '\0'). | |
3468 | * Return value will be 0 if no token is found, and it will be >= | |
3469 | * token_size if the token would not fit. | |
3470 | * | |
593a9e7b | 3471 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
3472 | * found token. Note that this occurs even if the token buffer is |
3473 | * too small to hold it. | |
3474 | */ | |
3475 | static inline size_t copy_token(const char **buf, | |
3476 | char *token, | |
3477 | size_t token_size) | |
3478 | { | |
3479 | size_t len; | |
3480 | ||
3481 | len = next_token(buf); | |
3482 | if (len < token_size) { | |
3483 | memcpy(token, *buf, len); | |
3484 | *(token + len) = '\0'; | |
3485 | } | |
3486 | *buf += len; | |
3487 | ||
3488 | return len; | |
3489 | } | |
3490 | ||
ea3352f4 AE |
3491 | /* |
3492 | * Finds the next token in *buf, dynamically allocates a buffer big | |
3493 | * enough to hold a copy of it, and copies the token into the new | |
3494 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
3495 | * that a duplicate buffer is created even for a zero-length token. | |
3496 | * | |
3497 | * Returns a pointer to the newly-allocated duplicate, or a null | |
3498 | * pointer if memory for the duplicate was not available. If | |
3499 | * the lenp argument is a non-null pointer, the length of the token | |
3500 | * (not including the '\0') is returned in *lenp. | |
3501 | * | |
3502 | * If successful, the *buf pointer will be updated to point beyond | |
3503 | * the end of the found token. | |
3504 | * | |
3505 | * Note: uses GFP_KERNEL for allocation. | |
3506 | */ | |
3507 | static inline char *dup_token(const char **buf, size_t *lenp) | |
3508 | { | |
3509 | char *dup; | |
3510 | size_t len; | |
3511 | ||
3512 | len = next_token(buf); | |
4caf35f9 | 3513 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
3514 | if (!dup) |
3515 | return NULL; | |
ea3352f4 AE |
3516 | *(dup + len) = '\0'; |
3517 | *buf += len; | |
3518 | ||
3519 | if (lenp) | |
3520 | *lenp = len; | |
3521 | ||
3522 | return dup; | |
3523 | } | |
3524 | ||
a725f65e | 3525 | /* |
859c31df AE |
3526 | * Parse the options provided for an "rbd add" (i.e., rbd image |
3527 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
3528 | * and the data written is passed here via a NUL-terminated buffer. | |
3529 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 3530 | * |
859c31df AE |
3531 | * The information extracted from these options is recorded in |
3532 | * the other parameters which return dynamically-allocated | |
3533 | * structures: | |
3534 | * ceph_opts | |
3535 | * The address of a pointer that will refer to a ceph options | |
3536 | * structure. Caller must release the returned pointer using | |
3537 | * ceph_destroy_options() when it is no longer needed. | |
3538 | * rbd_opts | |
3539 | * Address of an rbd options pointer. Fully initialized by | |
3540 | * this function; caller must release with kfree(). | |
3541 | * spec | |
3542 | * Address of an rbd image specification pointer. Fully | |
3543 | * initialized by this function based on parsed options. | |
3544 | * Caller must release with rbd_spec_put(). | |
3545 | * | |
3546 | * The options passed take this form: | |
3547 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
3548 | * where: | |
3549 | * <mon_addrs> | |
3550 | * A comma-separated list of one or more monitor addresses. | |
3551 | * A monitor address is an ip address, optionally followed | |
3552 | * by a port number (separated by a colon). | |
3553 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
3554 | * <options> | |
3555 | * A comma-separated list of ceph and/or rbd options. | |
3556 | * <pool_name> | |
3557 | * The name of the rados pool containing the rbd image. | |
3558 | * <image_name> | |
3559 | * The name of the image in that pool to map. | |
3560 | * <snap_id> | |
3561 | * An optional snapshot id. If provided, the mapping will | |
3562 | * present data from the image at the time that snapshot was | |
3563 | * created. The image head is used if no snapshot id is | |
3564 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 3565 | */ |
859c31df | 3566 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 3567 | struct ceph_options **ceph_opts, |
859c31df AE |
3568 | struct rbd_options **opts, |
3569 | struct rbd_spec **rbd_spec) | |
e28fff26 | 3570 | { |
d22f76e7 | 3571 | size_t len; |
859c31df | 3572 | char *options; |
0ddebc0c AE |
3573 | const char *mon_addrs; |
3574 | size_t mon_addrs_size; | |
859c31df | 3575 | struct rbd_spec *spec = NULL; |
4e9afeba | 3576 | struct rbd_options *rbd_opts = NULL; |
859c31df | 3577 | struct ceph_options *copts; |
dc79b113 | 3578 | int ret; |
e28fff26 AE |
3579 | |
3580 | /* The first four tokens are required */ | |
3581 | ||
7ef3214a | 3582 | len = next_token(&buf); |
4fb5d671 AE |
3583 | if (!len) { |
3584 | rbd_warn(NULL, "no monitor address(es) provided"); | |
3585 | return -EINVAL; | |
3586 | } | |
0ddebc0c | 3587 | mon_addrs = buf; |
f28e565a | 3588 | mon_addrs_size = len + 1; |
7ef3214a | 3589 | buf += len; |
a725f65e | 3590 | |
dc79b113 | 3591 | ret = -EINVAL; |
f28e565a AE |
3592 | options = dup_token(&buf, NULL); |
3593 | if (!options) | |
dc79b113 | 3594 | return -ENOMEM; |
4fb5d671 AE |
3595 | if (!*options) { |
3596 | rbd_warn(NULL, "no options provided"); | |
3597 | goto out_err; | |
3598 | } | |
e28fff26 | 3599 | |
859c31df AE |
3600 | spec = rbd_spec_alloc(); |
3601 | if (!spec) | |
f28e565a | 3602 | goto out_mem; |
859c31df AE |
3603 | |
3604 | spec->pool_name = dup_token(&buf, NULL); | |
3605 | if (!spec->pool_name) | |
3606 | goto out_mem; | |
4fb5d671 AE |
3607 | if (!*spec->pool_name) { |
3608 | rbd_warn(NULL, "no pool name provided"); | |
3609 | goto out_err; | |
3610 | } | |
e28fff26 | 3611 | |
69e7a02f | 3612 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 3613 | if (!spec->image_name) |
f28e565a | 3614 | goto out_mem; |
4fb5d671 AE |
3615 | if (!*spec->image_name) { |
3616 | rbd_warn(NULL, "no image name provided"); | |
3617 | goto out_err; | |
3618 | } | |
d4b125e9 | 3619 | |
f28e565a AE |
3620 | /* |
3621 | * Snapshot name is optional; default is to use "-" | |
3622 | * (indicating the head/no snapshot). | |
3623 | */ | |
3feeb894 | 3624 | len = next_token(&buf); |
820a5f3e | 3625 | if (!len) { |
3feeb894 AE |
3626 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
3627 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 3628 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 3629 | ret = -ENAMETOOLONG; |
f28e565a | 3630 | goto out_err; |
849b4260 | 3631 | } |
4caf35f9 | 3632 | spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
859c31df | 3633 | if (!spec->snap_name) |
f28e565a | 3634 | goto out_mem; |
859c31df | 3635 | *(spec->snap_name + len) = '\0'; |
e5c35534 | 3636 | |
0ddebc0c | 3637 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 3638 | |
4e9afeba AE |
3639 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
3640 | if (!rbd_opts) | |
3641 | goto out_mem; | |
3642 | ||
3643 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 3644 | |
859c31df | 3645 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 3646 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 3647 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
3648 | if (IS_ERR(copts)) { |
3649 | ret = PTR_ERR(copts); | |
dc79b113 AE |
3650 | goto out_err; |
3651 | } | |
859c31df AE |
3652 | kfree(options); |
3653 | ||
3654 | *ceph_opts = copts; | |
4e9afeba | 3655 | *opts = rbd_opts; |
859c31df | 3656 | *rbd_spec = spec; |
0ddebc0c | 3657 | |
dc79b113 | 3658 | return 0; |
f28e565a | 3659 | out_mem: |
dc79b113 | 3660 | ret = -ENOMEM; |
d22f76e7 | 3661 | out_err: |
859c31df AE |
3662 | kfree(rbd_opts); |
3663 | rbd_spec_put(spec); | |
f28e565a | 3664 | kfree(options); |
d22f76e7 | 3665 | |
dc79b113 | 3666 | return ret; |
a725f65e AE |
3667 | } |
3668 | ||
589d30e0 AE |
3669 | /* |
3670 | * An rbd format 2 image has a unique identifier, distinct from the | |
3671 | * name given to it by the user. Internally, that identifier is | |
3672 | * what's used to specify the names of objects related to the image. | |
3673 | * | |
3674 | * A special "rbd id" object is used to map an rbd image name to its | |
3675 | * id. If that object doesn't exist, then there is no v2 rbd image | |
3676 | * with the supplied name. | |
3677 | * | |
3678 | * This function will record the given rbd_dev's image_id field if | |
3679 | * it can be determined, and in that case will return 0. If any | |
3680 | * errors occur a negative errno will be returned and the rbd_dev's | |
3681 | * image_id field will be unchanged (and should be NULL). | |
3682 | */ | |
3683 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
3684 | { | |
3685 | int ret; | |
3686 | size_t size; | |
3687 | char *object_name; | |
3688 | void *response; | |
3689 | void *p; | |
3690 | ||
2c0d0a10 AE |
3691 | /* |
3692 | * When probing a parent image, the image id is already | |
3693 | * known (and the image name likely is not). There's no | |
3694 | * need to fetch the image id again in this case. | |
3695 | */ | |
3696 | if (rbd_dev->spec->image_id) | |
3697 | return 0; | |
3698 | ||
589d30e0 AE |
3699 | /* |
3700 | * First, see if the format 2 image id file exists, and if | |
3701 | * so, get the image's persistent id from it. | |
3702 | */ | |
69e7a02f | 3703 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
3704 | object_name = kmalloc(size, GFP_NOIO); |
3705 | if (!object_name) | |
3706 | return -ENOMEM; | |
0d7dbfce | 3707 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
3708 | dout("rbd id object name is %s\n", object_name); |
3709 | ||
3710 | /* Response will be an encoded string, which includes a length */ | |
3711 | ||
3712 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
3713 | response = kzalloc(size, GFP_NOIO); | |
3714 | if (!response) { | |
3715 | ret = -ENOMEM; | |
3716 | goto out; | |
3717 | } | |
3718 | ||
36be9a76 | 3719 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
589d30e0 AE |
3720 | "rbd", "get_id", |
3721 | NULL, 0, | |
07b2391f | 3722 | response, RBD_IMAGE_ID_LEN_MAX, NULL); |
36be9a76 | 3723 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
589d30e0 AE |
3724 | if (ret < 0) |
3725 | goto out; | |
36be9a76 | 3726 | ret = 0; /* rbd_obj_method_sync() can return positive */ |
589d30e0 AE |
3727 | |
3728 | p = response; | |
0d7dbfce | 3729 | rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, |
589d30e0 | 3730 | p + RBD_IMAGE_ID_LEN_MAX, |
979ed480 | 3731 | NULL, GFP_NOIO); |
0d7dbfce AE |
3732 | if (IS_ERR(rbd_dev->spec->image_id)) { |
3733 | ret = PTR_ERR(rbd_dev->spec->image_id); | |
3734 | rbd_dev->spec->image_id = NULL; | |
589d30e0 | 3735 | } else { |
0d7dbfce | 3736 | dout("image_id is %s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3737 | } |
3738 | out: | |
3739 | kfree(response); | |
3740 | kfree(object_name); | |
3741 | ||
3742 | return ret; | |
3743 | } | |
3744 | ||
a30b71b9 AE |
3745 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
3746 | { | |
3747 | int ret; | |
3748 | size_t size; | |
3749 | ||
3750 | /* Version 1 images have no id; empty string is used */ | |
3751 | ||
0d7dbfce AE |
3752 | rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); |
3753 | if (!rbd_dev->spec->image_id) | |
a30b71b9 | 3754 | return -ENOMEM; |
a30b71b9 AE |
3755 | |
3756 | /* Record the header object name for this rbd image. */ | |
3757 | ||
69e7a02f | 3758 | size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); |
a30b71b9 AE |
3759 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
3760 | if (!rbd_dev->header_name) { | |
3761 | ret = -ENOMEM; | |
3762 | goto out_err; | |
3763 | } | |
0d7dbfce AE |
3764 | sprintf(rbd_dev->header_name, "%s%s", |
3765 | rbd_dev->spec->image_name, RBD_SUFFIX); | |
a30b71b9 AE |
3766 | |
3767 | /* Populate rbd image metadata */ | |
3768 | ||
3769 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
3770 | if (ret < 0) | |
3771 | goto out_err; | |
86b00e0d AE |
3772 | |
3773 | /* Version 1 images have no parent (no layering) */ | |
3774 | ||
3775 | rbd_dev->parent_spec = NULL; | |
3776 | rbd_dev->parent_overlap = 0; | |
3777 | ||
a30b71b9 AE |
3778 | rbd_dev->image_format = 1; |
3779 | ||
3780 | dout("discovered version 1 image, header name is %s\n", | |
3781 | rbd_dev->header_name); | |
3782 | ||
3783 | return 0; | |
3784 | ||
3785 | out_err: | |
3786 | kfree(rbd_dev->header_name); | |
3787 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
3788 | kfree(rbd_dev->spec->image_id); |
3789 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
3790 | |
3791 | return ret; | |
3792 | } | |
3793 | ||
3794 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
3795 | { | |
3796 | size_t size; | |
9d475de5 | 3797 | int ret; |
6e14b1a6 | 3798 | u64 ver = 0; |
a30b71b9 AE |
3799 | |
3800 | /* | |
3801 | * Image id was filled in by the caller. Record the header | |
3802 | * object name for this rbd image. | |
3803 | */ | |
979ed480 | 3804 | size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); |
a30b71b9 AE |
3805 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
3806 | if (!rbd_dev->header_name) | |
3807 | return -ENOMEM; | |
3808 | sprintf(rbd_dev->header_name, "%s%s", | |
0d7dbfce | 3809 | RBD_HEADER_PREFIX, rbd_dev->spec->image_id); |
9d475de5 AE |
3810 | |
3811 | /* Get the size and object order for the image */ | |
3812 | ||
3813 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
3814 | if (ret < 0) |
3815 | goto out_err; | |
3816 | ||
3817 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
3818 | ||
3819 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
3820 | if (ret < 0) |
3821 | goto out_err; | |
3822 | ||
d889140c | 3823 | /* Get the and check features for the image */ |
b1b5402a AE |
3824 | |
3825 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
3826 | if (ret < 0) |
3827 | goto out_err; | |
35d489f9 | 3828 | |
86b00e0d AE |
3829 | /* If the image supports layering, get the parent info */ |
3830 | ||
3831 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
3832 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3833 | if (ret < 0) | |
3834 | goto out_err; | |
3835 | } | |
3836 | ||
6e14b1a6 AE |
3837 | /* crypto and compression type aren't (yet) supported for v2 images */ |
3838 | ||
3839 | rbd_dev->header.crypt_type = 0; | |
3840 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 3841 | |
6e14b1a6 AE |
3842 | /* Get the snapshot context, plus the header version */ |
3843 | ||
3844 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
3845 | if (ret) |
3846 | goto out_err; | |
6e14b1a6 AE |
3847 | rbd_dev->header.obj_version = ver; |
3848 | ||
a30b71b9 AE |
3849 | rbd_dev->image_format = 2; |
3850 | ||
3851 | dout("discovered version 2 image, header name is %s\n", | |
3852 | rbd_dev->header_name); | |
3853 | ||
35152979 | 3854 | return 0; |
9d475de5 | 3855 | out_err: |
86b00e0d AE |
3856 | rbd_dev->parent_overlap = 0; |
3857 | rbd_spec_put(rbd_dev->parent_spec); | |
3858 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
3859 | kfree(rbd_dev->header_name); |
3860 | rbd_dev->header_name = NULL; | |
1e130199 AE |
3861 | kfree(rbd_dev->header.object_prefix); |
3862 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
3863 | |
3864 | return ret; | |
a30b71b9 AE |
3865 | } |
3866 | ||
83a06263 AE |
3867 | static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) |
3868 | { | |
3869 | int ret; | |
3870 | ||
3871 | /* no need to lock here, as rbd_dev is not registered yet */ | |
3872 | ret = rbd_dev_snaps_update(rbd_dev); | |
3873 | if (ret) | |
3874 | return ret; | |
3875 | ||
9e15b77d AE |
3876 | ret = rbd_dev_probe_update_spec(rbd_dev); |
3877 | if (ret) | |
3878 | goto err_out_snaps; | |
3879 | ||
83a06263 AE |
3880 | ret = rbd_dev_set_mapping(rbd_dev); |
3881 | if (ret) | |
3882 | goto err_out_snaps; | |
3883 | ||
3884 | /* generate unique id: find highest unique id, add one */ | |
3885 | rbd_dev_id_get(rbd_dev); | |
3886 | ||
3887 | /* Fill in the device name, now that we have its id. */ | |
3888 | BUILD_BUG_ON(DEV_NAME_LEN | |
3889 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
3890 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
3891 | ||
3892 | /* Get our block major device number. */ | |
3893 | ||
3894 | ret = register_blkdev(0, rbd_dev->name); | |
3895 | if (ret < 0) | |
3896 | goto err_out_id; | |
3897 | rbd_dev->major = ret; | |
3898 | ||
3899 | /* Set up the blkdev mapping. */ | |
3900 | ||
3901 | ret = rbd_init_disk(rbd_dev); | |
3902 | if (ret) | |
3903 | goto err_out_blkdev; | |
3904 | ||
3905 | ret = rbd_bus_add_dev(rbd_dev); | |
3906 | if (ret) | |
3907 | goto err_out_disk; | |
3908 | ||
3909 | /* | |
3910 | * At this point cleanup in the event of an error is the job | |
3911 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
3912 | */ | |
3913 | down_write(&rbd_dev->header_rwsem); | |
3914 | ret = rbd_dev_snaps_register(rbd_dev); | |
3915 | up_write(&rbd_dev->header_rwsem); | |
3916 | if (ret) | |
3917 | goto err_out_bus; | |
3918 | ||
9969ebc5 | 3919 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
83a06263 AE |
3920 | if (ret) |
3921 | goto err_out_bus; | |
3922 | ||
3923 | /* Everything's ready. Announce the disk to the world. */ | |
3924 | ||
3925 | add_disk(rbd_dev->disk); | |
3926 | ||
3927 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
3928 | (unsigned long long) rbd_dev->mapping.size); | |
3929 | ||
3930 | return ret; | |
3931 | err_out_bus: | |
3932 | /* this will also clean up rest of rbd_dev stuff */ | |
3933 | ||
3934 | rbd_bus_del_dev(rbd_dev); | |
3935 | ||
3936 | return ret; | |
3937 | err_out_disk: | |
3938 | rbd_free_disk(rbd_dev); | |
3939 | err_out_blkdev: | |
3940 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
3941 | err_out_id: | |
3942 | rbd_dev_id_put(rbd_dev); | |
3943 | err_out_snaps: | |
3944 | rbd_remove_all_snaps(rbd_dev); | |
3945 | ||
3946 | return ret; | |
3947 | } | |
3948 | ||
a30b71b9 AE |
3949 | /* |
3950 | * Probe for the existence of the header object for the given rbd | |
3951 | * device. For format 2 images this includes determining the image | |
3952 | * id. | |
3953 | */ | |
3954 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
3955 | { | |
3956 | int ret; | |
3957 | ||
3958 | /* | |
3959 | * Get the id from the image id object. If it's not a | |
3960 | * format 2 image, we'll get ENOENT back, and we'll assume | |
3961 | * it's a format 1 image. | |
3962 | */ | |
3963 | ret = rbd_dev_image_id(rbd_dev); | |
3964 | if (ret) | |
3965 | ret = rbd_dev_v1_probe(rbd_dev); | |
3966 | else | |
3967 | ret = rbd_dev_v2_probe(rbd_dev); | |
83a06263 | 3968 | if (ret) { |
a30b71b9 AE |
3969 | dout("probe failed, returning %d\n", ret); |
3970 | ||
83a06263 AE |
3971 | return ret; |
3972 | } | |
3973 | ||
3974 | ret = rbd_dev_probe_finish(rbd_dev); | |
3975 | if (ret) | |
3976 | rbd_header_free(&rbd_dev->header); | |
3977 | ||
a30b71b9 AE |
3978 | return ret; |
3979 | } | |
3980 | ||
59c2be1e YS |
3981 | static ssize_t rbd_add(struct bus_type *bus, |
3982 | const char *buf, | |
3983 | size_t count) | |
602adf40 | 3984 | { |
cb8627c7 | 3985 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 3986 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 3987 | struct rbd_options *rbd_opts = NULL; |
859c31df | 3988 | struct rbd_spec *spec = NULL; |
9d3997fd | 3989 | struct rbd_client *rbdc; |
27cc2594 AE |
3990 | struct ceph_osd_client *osdc; |
3991 | int rc = -ENOMEM; | |
602adf40 YS |
3992 | |
3993 | if (!try_module_get(THIS_MODULE)) | |
3994 | return -ENODEV; | |
3995 | ||
602adf40 | 3996 | /* parse add command */ |
859c31df | 3997 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 3998 | if (rc < 0) |
bd4ba655 | 3999 | goto err_out_module; |
78cea76e | 4000 | |
9d3997fd AE |
4001 | rbdc = rbd_get_client(ceph_opts); |
4002 | if (IS_ERR(rbdc)) { | |
4003 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4004 | goto err_out_args; |
9d3997fd | 4005 | } |
c53d5893 | 4006 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4007 | |
602adf40 | 4008 | /* pick the pool */ |
9d3997fd | 4009 | osdc = &rbdc->client->osdc; |
859c31df | 4010 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4011 | if (rc < 0) |
4012 | goto err_out_client; | |
859c31df AE |
4013 | spec->pool_id = (u64) rc; |
4014 | ||
0903e875 AE |
4015 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4016 | ||
4017 | if (WARN_ON(spec->pool_id > (u64) U32_MAX)) { | |
4018 | rc = -EIO; | |
4019 | goto err_out_client; | |
4020 | } | |
4021 | ||
c53d5893 | 4022 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4023 | if (!rbd_dev) |
4024 | goto err_out_client; | |
c53d5893 AE |
4025 | rbdc = NULL; /* rbd_dev now owns this */ |
4026 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4027 | |
bd4ba655 | 4028 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4029 | kfree(rbd_opts); |
4030 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4031 | |
a30b71b9 AE |
4032 | rc = rbd_dev_probe(rbd_dev); |
4033 | if (rc < 0) | |
c53d5893 | 4034 | goto err_out_rbd_dev; |
05fd6f6f | 4035 | |
602adf40 | 4036 | return count; |
c53d5893 AE |
4037 | err_out_rbd_dev: |
4038 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4039 | err_out_client: |
9d3997fd | 4040 | rbd_put_client(rbdc); |
0ddebc0c | 4041 | err_out_args: |
78cea76e AE |
4042 | if (ceph_opts) |
4043 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4044 | kfree(rbd_opts); |
859c31df | 4045 | rbd_spec_put(spec); |
bd4ba655 AE |
4046 | err_out_module: |
4047 | module_put(THIS_MODULE); | |
27cc2594 | 4048 | |
602adf40 | 4049 | dout("Error adding device %s\n", buf); |
27cc2594 AE |
4050 | |
4051 | return (ssize_t) rc; | |
602adf40 YS |
4052 | } |
4053 | ||
de71a297 | 4054 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4055 | { |
4056 | struct list_head *tmp; | |
4057 | struct rbd_device *rbd_dev; | |
4058 | ||
e124a82f | 4059 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4060 | list_for_each(tmp, &rbd_dev_list) { |
4061 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4062 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4063 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4064 | return rbd_dev; |
e124a82f | 4065 | } |
602adf40 | 4066 | } |
e124a82f | 4067 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4068 | return NULL; |
4069 | } | |
4070 | ||
dfc5606d | 4071 | static void rbd_dev_release(struct device *dev) |
602adf40 | 4072 | { |
593a9e7b | 4073 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4074 | |
59c2be1e | 4075 | if (rbd_dev->watch_event) |
9969ebc5 | 4076 | rbd_dev_header_watch_sync(rbd_dev, 0); |
602adf40 YS |
4077 | |
4078 | /* clean up and free blkdev */ | |
4079 | rbd_free_disk(rbd_dev); | |
4080 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 4081 | |
2ac4e75d AE |
4082 | /* release allocated disk header fields */ |
4083 | rbd_header_free(&rbd_dev->header); | |
4084 | ||
32eec68d | 4085 | /* done with the id, and with the rbd_dev */ |
e2839308 | 4086 | rbd_dev_id_put(rbd_dev); |
c53d5893 AE |
4087 | rbd_assert(rbd_dev->rbd_client != NULL); |
4088 | rbd_dev_destroy(rbd_dev); | |
602adf40 YS |
4089 | |
4090 | /* release module ref */ | |
4091 | module_put(THIS_MODULE); | |
602adf40 YS |
4092 | } |
4093 | ||
dfc5606d YS |
4094 | static ssize_t rbd_remove(struct bus_type *bus, |
4095 | const char *buf, | |
4096 | size_t count) | |
602adf40 YS |
4097 | { |
4098 | struct rbd_device *rbd_dev = NULL; | |
4099 | int target_id, rc; | |
4100 | unsigned long ul; | |
4101 | int ret = count; | |
4102 | ||
4103 | rc = strict_strtoul(buf, 10, &ul); | |
4104 | if (rc) | |
4105 | return rc; | |
4106 | ||
4107 | /* convert to int; abort if we lost anything in the conversion */ | |
4108 | target_id = (int) ul; | |
4109 | if (target_id != ul) | |
4110 | return -EINVAL; | |
4111 | ||
4112 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
4113 | ||
4114 | rbd_dev = __rbd_get_dev(target_id); | |
4115 | if (!rbd_dev) { | |
4116 | ret = -ENOENT; | |
4117 | goto done; | |
42382b70 AE |
4118 | } |
4119 | ||
a14ea269 | 4120 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 4121 | if (rbd_dev->open_count) |
42382b70 | 4122 | ret = -EBUSY; |
b82d167b AE |
4123 | else |
4124 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 4125 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 4126 | if (ret < 0) |
42382b70 | 4127 | goto done; |
602adf40 | 4128 | |
41f38c2b | 4129 | rbd_remove_all_snaps(rbd_dev); |
dfc5606d | 4130 | rbd_bus_del_dev(rbd_dev); |
602adf40 YS |
4131 | |
4132 | done: | |
4133 | mutex_unlock(&ctl_mutex); | |
aafb230e | 4134 | |
602adf40 YS |
4135 | return ret; |
4136 | } | |
4137 | ||
602adf40 YS |
4138 | /* |
4139 | * create control files in sysfs | |
dfc5606d | 4140 | * /sys/bus/rbd/... |
602adf40 YS |
4141 | */ |
4142 | static int rbd_sysfs_init(void) | |
4143 | { | |
dfc5606d | 4144 | int ret; |
602adf40 | 4145 | |
fed4c143 | 4146 | ret = device_register(&rbd_root_dev); |
21079786 | 4147 | if (ret < 0) |
dfc5606d | 4148 | return ret; |
602adf40 | 4149 | |
fed4c143 AE |
4150 | ret = bus_register(&rbd_bus_type); |
4151 | if (ret < 0) | |
4152 | device_unregister(&rbd_root_dev); | |
602adf40 | 4153 | |
602adf40 YS |
4154 | return ret; |
4155 | } | |
4156 | ||
4157 | static void rbd_sysfs_cleanup(void) | |
4158 | { | |
dfc5606d | 4159 | bus_unregister(&rbd_bus_type); |
fed4c143 | 4160 | device_unregister(&rbd_root_dev); |
602adf40 YS |
4161 | } |
4162 | ||
4163 | int __init rbd_init(void) | |
4164 | { | |
4165 | int rc; | |
4166 | ||
1e32d34c AE |
4167 | if (!libceph_compatible(NULL)) { |
4168 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
4169 | ||
4170 | return -EINVAL; | |
4171 | } | |
602adf40 YS |
4172 | rc = rbd_sysfs_init(); |
4173 | if (rc) | |
4174 | return rc; | |
f0f8cef5 | 4175 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
4176 | return 0; |
4177 | } | |
4178 | ||
4179 | void __exit rbd_exit(void) | |
4180 | { | |
4181 | rbd_sysfs_cleanup(); | |
4182 | } | |
4183 | ||
4184 | module_init(rbd_init); | |
4185 | module_exit(rbd_exit); | |
4186 | ||
4187 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
4188 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
4189 | MODULE_DESCRIPTION("rados block device"); | |
4190 | ||
4191 | /* following authorship retained from original osdblk.c */ | |
4192 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
4193 | ||
4194 | MODULE_LICENSE("GPL"); |