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 | ||
f0f8cef5 AE |
55 | #define RBD_DRV_NAME "rbd" |
56 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
57 | |
58 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
59 | ||
d4b125e9 AE |
60 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
61 | #define RBD_MAX_SNAP_NAME_LEN \ | |
62 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
63 | ||
35d489f9 | 64 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
65 | |
66 | #define RBD_SNAP_HEAD_NAME "-" | |
67 | ||
9e15b77d AE |
68 | /* This allows a single page to hold an image name sent by OSD */ |
69 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 70 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 71 | |
1e130199 | 72 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 73 | |
d889140c AE |
74 | /* Feature bits */ |
75 | ||
5cbf6f12 AE |
76 | #define RBD_FEATURE_LAYERING (1<<0) |
77 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
78 | #define RBD_FEATURES_ALL \ | |
79 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
80 | |
81 | /* Features supported by this (client software) implementation. */ | |
82 | ||
770eba6e | 83 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 84 | |
81a89793 AE |
85 | /* |
86 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
87 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
88 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
89 | * enough to hold all possible device names. | |
90 | */ | |
602adf40 | 91 | #define DEV_NAME_LEN 32 |
81a89793 | 92 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
93 | |
94 | /* | |
95 | * block device image metadata (in-memory version) | |
96 | */ | |
97 | struct rbd_image_header { | |
f84344f3 | 98 | /* These four fields never change for a given rbd image */ |
849b4260 | 99 | char *object_prefix; |
34b13184 | 100 | u64 features; |
602adf40 YS |
101 | __u8 obj_order; |
102 | __u8 crypt_type; | |
103 | __u8 comp_type; | |
602adf40 | 104 | |
f84344f3 AE |
105 | /* The remaining fields need to be updated occasionally */ |
106 | u64 image_size; | |
107 | struct ceph_snap_context *snapc; | |
602adf40 YS |
108 | char *snap_names; |
109 | u64 *snap_sizes; | |
59c2be1e YS |
110 | |
111 | u64 obj_version; | |
112 | }; | |
113 | ||
0d7dbfce AE |
114 | /* |
115 | * An rbd image specification. | |
116 | * | |
117 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
118 | * identify an image. Each rbd_dev structure includes a pointer to |
119 | * an rbd_spec structure that encapsulates this identity. | |
120 | * | |
121 | * Each of the id's in an rbd_spec has an associated name. For a | |
122 | * user-mapped image, the names are supplied and the id's associated | |
123 | * with them are looked up. For a layered image, a parent image is | |
124 | * defined by the tuple, and the names are looked up. | |
125 | * | |
126 | * An rbd_dev structure contains a parent_spec pointer which is | |
127 | * non-null if the image it represents is a child in a layered | |
128 | * image. This pointer will refer to the rbd_spec structure used | |
129 | * by the parent rbd_dev for its own identity (i.e., the structure | |
130 | * is shared between the parent and child). | |
131 | * | |
132 | * Since these structures are populated once, during the discovery | |
133 | * phase of image construction, they are effectively immutable so | |
134 | * we make no effort to synchronize access to them. | |
135 | * | |
136 | * Note that code herein does not assume the image name is known (it | |
137 | * could be a null pointer). | |
0d7dbfce AE |
138 | */ |
139 | struct rbd_spec { | |
140 | u64 pool_id; | |
141 | char *pool_name; | |
142 | ||
143 | char *image_id; | |
0d7dbfce | 144 | char *image_name; |
0d7dbfce AE |
145 | |
146 | u64 snap_id; | |
147 | char *snap_name; | |
148 | ||
149 | struct kref kref; | |
150 | }; | |
151 | ||
602adf40 | 152 | /* |
f0f8cef5 | 153 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
154 | */ |
155 | struct rbd_client { | |
156 | struct ceph_client *client; | |
157 | struct kref kref; | |
158 | struct list_head node; | |
159 | }; | |
160 | ||
bf0d5f50 AE |
161 | struct rbd_img_request; |
162 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
163 | ||
164 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
165 | ||
166 | struct rbd_obj_request; | |
167 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
168 | ||
9969ebc5 AE |
169 | enum obj_request_type { |
170 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
171 | }; | |
bf0d5f50 | 172 | |
926f9b3f AE |
173 | enum obj_req_flags { |
174 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 175 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
176 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
177 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
178 | }; |
179 | ||
bf0d5f50 AE |
180 | struct rbd_obj_request { |
181 | const char *object_name; | |
182 | u64 offset; /* object start byte */ | |
183 | u64 length; /* bytes from offset */ | |
926f9b3f | 184 | unsigned long flags; |
bf0d5f50 | 185 | |
c5b5ef6c AE |
186 | /* |
187 | * An object request associated with an image will have its | |
188 | * img_data flag set; a standalone object request will not. | |
189 | * | |
190 | * A standalone object request will have which == BAD_WHICH | |
191 | * and a null obj_request pointer. | |
192 | * | |
193 | * An object request initiated in support of a layered image | |
194 | * object (to check for its existence before a write) will | |
195 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
196 | * | |
197 | * Finally, an object request for rbd image data will have | |
198 | * which != BAD_WHICH, and will have a non-null img_request | |
199 | * pointer. The value of which will be in the range | |
200 | * 0..(img_request->obj_request_count-1). | |
201 | */ | |
202 | union { | |
203 | struct rbd_obj_request *obj_request; /* STAT op */ | |
204 | struct { | |
205 | struct rbd_img_request *img_request; | |
206 | u64 img_offset; | |
207 | /* links for img_request->obj_requests list */ | |
208 | struct list_head links; | |
209 | }; | |
210 | }; | |
bf0d5f50 AE |
211 | u32 which; /* posn image request list */ |
212 | ||
213 | enum obj_request_type type; | |
788e2df3 AE |
214 | union { |
215 | struct bio *bio_list; | |
216 | struct { | |
217 | struct page **pages; | |
218 | u32 page_count; | |
219 | }; | |
220 | }; | |
0eefd470 | 221 | struct page **copyup_pages; |
bf0d5f50 AE |
222 | |
223 | struct ceph_osd_request *osd_req; | |
224 | ||
225 | u64 xferred; /* bytes transferred */ | |
226 | u64 version; | |
1b83bef2 | 227 | int result; |
bf0d5f50 AE |
228 | |
229 | rbd_obj_callback_t callback; | |
788e2df3 | 230 | struct completion completion; |
bf0d5f50 AE |
231 | |
232 | struct kref kref; | |
233 | }; | |
234 | ||
0c425248 | 235 | enum img_req_flags { |
9849e986 AE |
236 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
237 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 238 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
239 | }; |
240 | ||
bf0d5f50 | 241 | struct rbd_img_request { |
bf0d5f50 AE |
242 | struct rbd_device *rbd_dev; |
243 | u64 offset; /* starting image byte offset */ | |
244 | u64 length; /* byte count from offset */ | |
0c425248 | 245 | unsigned long flags; |
bf0d5f50 | 246 | union { |
9849e986 | 247 | u64 snap_id; /* for reads */ |
bf0d5f50 | 248 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
249 | }; |
250 | union { | |
251 | struct request *rq; /* block request */ | |
252 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 253 | }; |
3d7efd18 | 254 | struct page **copyup_pages; |
bf0d5f50 AE |
255 | spinlock_t completion_lock;/* protects next_completion */ |
256 | u32 next_completion; | |
257 | rbd_img_callback_t callback; | |
55f27e09 | 258 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 259 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
260 | |
261 | u32 obj_request_count; | |
262 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
263 | ||
264 | struct kref kref; | |
265 | }; | |
266 | ||
267 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 268 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 269 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 270 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 271 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 272 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 273 | |
dfc5606d | 274 | struct rbd_snap { |
dfc5606d | 275 | const char *name; |
3591538f | 276 | u64 size; |
dfc5606d YS |
277 | struct list_head node; |
278 | u64 id; | |
34b13184 | 279 | u64 features; |
dfc5606d YS |
280 | }; |
281 | ||
f84344f3 | 282 | struct rbd_mapping { |
99c1f08f | 283 | u64 size; |
34b13184 | 284 | u64 features; |
f84344f3 AE |
285 | bool read_only; |
286 | }; | |
287 | ||
602adf40 YS |
288 | /* |
289 | * a single device | |
290 | */ | |
291 | struct rbd_device { | |
de71a297 | 292 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
293 | |
294 | int major; /* blkdev assigned major */ | |
295 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 296 | |
a30b71b9 | 297 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
298 | struct rbd_client *rbd_client; |
299 | ||
300 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
301 | ||
b82d167b | 302 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
303 | |
304 | struct rbd_image_header header; | |
b82d167b | 305 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 306 | struct rbd_spec *spec; |
602adf40 | 307 | |
0d7dbfce | 308 | char *header_name; |
971f839a | 309 | |
0903e875 AE |
310 | struct ceph_file_layout layout; |
311 | ||
59c2be1e | 312 | struct ceph_osd_event *watch_event; |
975241af | 313 | struct rbd_obj_request *watch_request; |
59c2be1e | 314 | |
86b00e0d AE |
315 | struct rbd_spec *parent_spec; |
316 | u64 parent_overlap; | |
2f82ee54 | 317 | struct rbd_device *parent; |
86b00e0d | 318 | |
cc070d59 AE |
319 | u64 stripe_unit; |
320 | u64 stripe_count; | |
321 | ||
c666601a JD |
322 | /* protects updating the header */ |
323 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
324 | |
325 | struct rbd_mapping mapping; | |
602adf40 YS |
326 | |
327 | struct list_head node; | |
dfc5606d YS |
328 | |
329 | /* list of snapshots */ | |
330 | struct list_head snaps; | |
331 | ||
332 | /* sysfs related */ | |
333 | struct device dev; | |
b82d167b | 334 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
335 | }; |
336 | ||
b82d167b AE |
337 | /* |
338 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
339 | * rbd_dev->lock is used to protect access. | |
340 | * | |
341 | * Currently, only the "removing" flag (which is coupled with the | |
342 | * "open_count" field) requires atomic access. | |
343 | */ | |
6d292906 AE |
344 | enum rbd_dev_flags { |
345 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 346 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
347 | }; |
348 | ||
602adf40 | 349 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 350 | |
602adf40 | 351 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
352 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
353 | ||
432b8587 AE |
354 | static LIST_HEAD(rbd_client_list); /* clients */ |
355 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 356 | |
3d7efd18 AE |
357 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
358 | ||
304f6808 | 359 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
304f6808 | 360 | |
dfc5606d | 361 | static void rbd_dev_release(struct device *dev); |
41f38c2b | 362 | static void rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 363 | |
f0f8cef5 AE |
364 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
365 | size_t count); | |
366 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
367 | size_t count); | |
2f82ee54 | 368 | static int rbd_dev_probe(struct rbd_device *rbd_dev); |
f0f8cef5 AE |
369 | |
370 | static struct bus_attribute rbd_bus_attrs[] = { | |
371 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
372 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
373 | __ATTR_NULL | |
374 | }; | |
375 | ||
376 | static struct bus_type rbd_bus_type = { | |
377 | .name = "rbd", | |
378 | .bus_attrs = rbd_bus_attrs, | |
379 | }; | |
380 | ||
381 | static void rbd_root_dev_release(struct device *dev) | |
382 | { | |
383 | } | |
384 | ||
385 | static struct device rbd_root_dev = { | |
386 | .init_name = "rbd", | |
387 | .release = rbd_root_dev_release, | |
388 | }; | |
389 | ||
06ecc6cb AE |
390 | static __printf(2, 3) |
391 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
392 | { | |
393 | struct va_format vaf; | |
394 | va_list args; | |
395 | ||
396 | va_start(args, fmt); | |
397 | vaf.fmt = fmt; | |
398 | vaf.va = &args; | |
399 | ||
400 | if (!rbd_dev) | |
401 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
402 | else if (rbd_dev->disk) | |
403 | printk(KERN_WARNING "%s: %s: %pV\n", | |
404 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
405 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
406 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
407 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
408 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
409 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
410 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
411 | else /* punt */ | |
412 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
413 | RBD_DRV_NAME, rbd_dev, &vaf); | |
414 | va_end(args); | |
415 | } | |
416 | ||
aafb230e AE |
417 | #ifdef RBD_DEBUG |
418 | #define rbd_assert(expr) \ | |
419 | if (unlikely(!(expr))) { \ | |
420 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
421 | "at line %d:\n\n" \ | |
422 | "\trbd_assert(%s);\n\n", \ | |
423 | __func__, __LINE__, #expr); \ | |
424 | BUG(); \ | |
425 | } | |
426 | #else /* !RBD_DEBUG */ | |
427 | # define rbd_assert(expr) ((void) 0) | |
428 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 429 | |
8b3e1a56 | 430 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
b454e36d | 431 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
8b3e1a56 | 432 | |
117973fb AE |
433 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
434 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); | |
59c2be1e | 435 | |
602adf40 YS |
436 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
437 | { | |
f0f8cef5 | 438 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 439 | bool removing = false; |
602adf40 | 440 | |
f84344f3 | 441 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
442 | return -EROFS; |
443 | ||
a14ea269 | 444 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
445 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
446 | removing = true; | |
447 | else | |
448 | rbd_dev->open_count++; | |
a14ea269 | 449 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
450 | if (removing) |
451 | return -ENOENT; | |
452 | ||
42382b70 | 453 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 454 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 455 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 456 | mutex_unlock(&ctl_mutex); |
340c7a2b | 457 | |
602adf40 YS |
458 | return 0; |
459 | } | |
460 | ||
dfc5606d YS |
461 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
462 | { | |
463 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
464 | unsigned long open_count_before; |
465 | ||
a14ea269 | 466 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 467 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 468 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 469 | rbd_assert(open_count_before > 0); |
dfc5606d | 470 | |
42382b70 | 471 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 472 | put_device(&rbd_dev->dev); |
42382b70 | 473 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
474 | |
475 | return 0; | |
476 | } | |
477 | ||
602adf40 YS |
478 | static const struct block_device_operations rbd_bd_ops = { |
479 | .owner = THIS_MODULE, | |
480 | .open = rbd_open, | |
dfc5606d | 481 | .release = rbd_release, |
602adf40 YS |
482 | }; |
483 | ||
484 | /* | |
485 | * Initialize an rbd client instance. | |
43ae4701 | 486 | * We own *ceph_opts. |
602adf40 | 487 | */ |
f8c38929 | 488 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
489 | { |
490 | struct rbd_client *rbdc; | |
491 | int ret = -ENOMEM; | |
492 | ||
37206ee5 | 493 | dout("%s:\n", __func__); |
602adf40 YS |
494 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
495 | if (!rbdc) | |
496 | goto out_opt; | |
497 | ||
498 | kref_init(&rbdc->kref); | |
499 | INIT_LIST_HEAD(&rbdc->node); | |
500 | ||
bc534d86 AE |
501 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
502 | ||
43ae4701 | 503 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 504 | if (IS_ERR(rbdc->client)) |
bc534d86 | 505 | goto out_mutex; |
43ae4701 | 506 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
507 | |
508 | ret = ceph_open_session(rbdc->client); | |
509 | if (ret < 0) | |
510 | goto out_err; | |
511 | ||
432b8587 | 512 | spin_lock(&rbd_client_list_lock); |
602adf40 | 513 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 514 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 515 | |
bc534d86 | 516 | mutex_unlock(&ctl_mutex); |
37206ee5 | 517 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 518 | |
602adf40 YS |
519 | return rbdc; |
520 | ||
521 | out_err: | |
522 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
523 | out_mutex: |
524 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
525 | kfree(rbdc); |
526 | out_opt: | |
43ae4701 AE |
527 | if (ceph_opts) |
528 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
529 | dout("%s: error %d\n", __func__, ret); |
530 | ||
28f259b7 | 531 | return ERR_PTR(ret); |
602adf40 YS |
532 | } |
533 | ||
2f82ee54 AE |
534 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
535 | { | |
536 | kref_get(&rbdc->kref); | |
537 | ||
538 | return rbdc; | |
539 | } | |
540 | ||
602adf40 | 541 | /* |
1f7ba331 AE |
542 | * Find a ceph client with specific addr and configuration. If |
543 | * found, bump its reference count. | |
602adf40 | 544 | */ |
1f7ba331 | 545 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
546 | { |
547 | struct rbd_client *client_node; | |
1f7ba331 | 548 | bool found = false; |
602adf40 | 549 | |
43ae4701 | 550 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
551 | return NULL; |
552 | ||
1f7ba331 AE |
553 | spin_lock(&rbd_client_list_lock); |
554 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
555 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
556 | __rbd_get_client(client_node); |
557 | ||
1f7ba331 AE |
558 | found = true; |
559 | break; | |
560 | } | |
561 | } | |
562 | spin_unlock(&rbd_client_list_lock); | |
563 | ||
564 | return found ? client_node : NULL; | |
602adf40 YS |
565 | } |
566 | ||
59c2be1e YS |
567 | /* |
568 | * mount options | |
569 | */ | |
570 | enum { | |
59c2be1e YS |
571 | Opt_last_int, |
572 | /* int args above */ | |
573 | Opt_last_string, | |
574 | /* string args above */ | |
cc0538b6 AE |
575 | Opt_read_only, |
576 | Opt_read_write, | |
577 | /* Boolean args above */ | |
578 | Opt_last_bool, | |
59c2be1e YS |
579 | }; |
580 | ||
43ae4701 | 581 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
582 | /* int args above */ |
583 | /* string args above */ | |
be466c1c | 584 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
585 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
586 | {Opt_read_write, "read_write"}, | |
587 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
588 | /* Boolean args above */ | |
59c2be1e YS |
589 | {-1, NULL} |
590 | }; | |
591 | ||
98571b5a AE |
592 | struct rbd_options { |
593 | bool read_only; | |
594 | }; | |
595 | ||
596 | #define RBD_READ_ONLY_DEFAULT false | |
597 | ||
59c2be1e YS |
598 | static int parse_rbd_opts_token(char *c, void *private) |
599 | { | |
43ae4701 | 600 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
601 | substring_t argstr[MAX_OPT_ARGS]; |
602 | int token, intval, ret; | |
603 | ||
43ae4701 | 604 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
605 | if (token < 0) |
606 | return -EINVAL; | |
607 | ||
608 | if (token < Opt_last_int) { | |
609 | ret = match_int(&argstr[0], &intval); | |
610 | if (ret < 0) { | |
611 | pr_err("bad mount option arg (not int) " | |
612 | "at '%s'\n", c); | |
613 | return ret; | |
614 | } | |
615 | dout("got int token %d val %d\n", token, intval); | |
616 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
617 | dout("got string token %d val %s\n", token, | |
618 | argstr[0].from); | |
cc0538b6 AE |
619 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
620 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
621 | } else { |
622 | dout("got token %d\n", token); | |
623 | } | |
624 | ||
625 | switch (token) { | |
cc0538b6 AE |
626 | case Opt_read_only: |
627 | rbd_opts->read_only = true; | |
628 | break; | |
629 | case Opt_read_write: | |
630 | rbd_opts->read_only = false; | |
631 | break; | |
59c2be1e | 632 | default: |
aafb230e AE |
633 | rbd_assert(false); |
634 | break; | |
59c2be1e YS |
635 | } |
636 | return 0; | |
637 | } | |
638 | ||
602adf40 YS |
639 | /* |
640 | * Get a ceph client with specific addr and configuration, if one does | |
641 | * not exist create it. | |
642 | */ | |
9d3997fd | 643 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 644 | { |
f8c38929 | 645 | struct rbd_client *rbdc; |
59c2be1e | 646 | |
1f7ba331 | 647 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 648 | if (rbdc) /* using an existing client */ |
43ae4701 | 649 | ceph_destroy_options(ceph_opts); |
9d3997fd | 650 | else |
f8c38929 | 651 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 652 | |
9d3997fd | 653 | return rbdc; |
602adf40 YS |
654 | } |
655 | ||
656 | /* | |
657 | * Destroy ceph client | |
d23a4b3f | 658 | * |
432b8587 | 659 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
660 | */ |
661 | static void rbd_client_release(struct kref *kref) | |
662 | { | |
663 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
664 | ||
37206ee5 | 665 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 666 | spin_lock(&rbd_client_list_lock); |
602adf40 | 667 | list_del(&rbdc->node); |
cd9d9f5d | 668 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
669 | |
670 | ceph_destroy_client(rbdc->client); | |
671 | kfree(rbdc); | |
672 | } | |
673 | ||
674 | /* | |
675 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
676 | * it. | |
677 | */ | |
9d3997fd | 678 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 679 | { |
c53d5893 AE |
680 | if (rbdc) |
681 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
682 | } |
683 | ||
a30b71b9 AE |
684 | static bool rbd_image_format_valid(u32 image_format) |
685 | { | |
686 | return image_format == 1 || image_format == 2; | |
687 | } | |
688 | ||
8e94af8e AE |
689 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
690 | { | |
103a150f AE |
691 | size_t size; |
692 | u32 snap_count; | |
693 | ||
694 | /* The header has to start with the magic rbd header text */ | |
695 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
696 | return false; | |
697 | ||
db2388b6 AE |
698 | /* The bio layer requires at least sector-sized I/O */ |
699 | ||
700 | if (ondisk->options.order < SECTOR_SHIFT) | |
701 | return false; | |
702 | ||
703 | /* If we use u64 in a few spots we may be able to loosen this */ | |
704 | ||
705 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
706 | return false; | |
707 | ||
103a150f AE |
708 | /* |
709 | * The size of a snapshot header has to fit in a size_t, and | |
710 | * that limits the number of snapshots. | |
711 | */ | |
712 | snap_count = le32_to_cpu(ondisk->snap_count); | |
713 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
714 | if (snap_count > size / sizeof (__le64)) | |
715 | return false; | |
716 | ||
717 | /* | |
718 | * Not only that, but the size of the entire the snapshot | |
719 | * header must also be representable in a size_t. | |
720 | */ | |
721 | size -= snap_count * sizeof (__le64); | |
722 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
723 | return false; | |
724 | ||
725 | return true; | |
8e94af8e AE |
726 | } |
727 | ||
602adf40 YS |
728 | /* |
729 | * Create a new header structure, translate header format from the on-disk | |
730 | * header. | |
731 | */ | |
732 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 733 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 734 | { |
ccece235 | 735 | u32 snap_count; |
58c17b0e | 736 | size_t len; |
d2bb24e5 | 737 | size_t size; |
621901d6 | 738 | u32 i; |
602adf40 | 739 | |
6a52325f AE |
740 | memset(header, 0, sizeof (*header)); |
741 | ||
103a150f AE |
742 | snap_count = le32_to_cpu(ondisk->snap_count); |
743 | ||
58c17b0e AE |
744 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
745 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 746 | if (!header->object_prefix) |
602adf40 | 747 | return -ENOMEM; |
58c17b0e AE |
748 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
749 | header->object_prefix[len] = '\0'; | |
00f1f36f | 750 | |
602adf40 | 751 | if (snap_count) { |
f785cc1d AE |
752 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
753 | ||
621901d6 AE |
754 | /* Save a copy of the snapshot names */ |
755 | ||
f785cc1d AE |
756 | if (snap_names_len > (u64) SIZE_MAX) |
757 | return -EIO; | |
758 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 759 | if (!header->snap_names) |
6a52325f | 760 | goto out_err; |
f785cc1d AE |
761 | /* |
762 | * Note that rbd_dev_v1_header_read() guarantees | |
763 | * the ondisk buffer we're working with has | |
764 | * snap_names_len bytes beyond the end of the | |
765 | * snapshot id array, this memcpy() is safe. | |
766 | */ | |
767 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
768 | snap_names_len); | |
6a52325f | 769 | |
621901d6 AE |
770 | /* Record each snapshot's size */ |
771 | ||
d2bb24e5 AE |
772 | size = snap_count * sizeof (*header->snap_sizes); |
773 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 774 | if (!header->snap_sizes) |
6a52325f | 775 | goto out_err; |
621901d6 AE |
776 | for (i = 0; i < snap_count; i++) |
777 | header->snap_sizes[i] = | |
778 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 779 | } else { |
ccece235 | 780 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
781 | header->snap_names = NULL; |
782 | header->snap_sizes = NULL; | |
783 | } | |
849b4260 | 784 | |
34b13184 | 785 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
786 | header->obj_order = ondisk->options.order; |
787 | header->crypt_type = ondisk->options.crypt_type; | |
788 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 789 | |
621901d6 AE |
790 | /* Allocate and fill in the snapshot context */ |
791 | ||
f84344f3 | 792 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
793 | size = sizeof (struct ceph_snap_context); |
794 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
795 | header->snapc = kzalloc(size, GFP_KERNEL); | |
796 | if (!header->snapc) | |
797 | goto out_err; | |
602adf40 YS |
798 | |
799 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 800 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 801 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
802 | for (i = 0; i < snap_count; i++) |
803 | header->snapc->snaps[i] = | |
804 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
805 | |
806 | return 0; | |
807 | ||
6a52325f | 808 | out_err: |
849b4260 | 809 | kfree(header->snap_sizes); |
ccece235 | 810 | header->snap_sizes = NULL; |
602adf40 | 811 | kfree(header->snap_names); |
ccece235 | 812 | header->snap_names = NULL; |
6a52325f AE |
813 | kfree(header->object_prefix); |
814 | header->object_prefix = NULL; | |
ccece235 | 815 | |
00f1f36f | 816 | return -ENOMEM; |
602adf40 YS |
817 | } |
818 | ||
9e15b77d AE |
819 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
820 | { | |
821 | struct rbd_snap *snap; | |
822 | ||
823 | if (snap_id == CEPH_NOSNAP) | |
824 | return RBD_SNAP_HEAD_NAME; | |
825 | ||
826 | list_for_each_entry(snap, &rbd_dev->snaps, node) | |
827 | if (snap_id == snap->id) | |
828 | return snap->name; | |
829 | ||
830 | return NULL; | |
831 | } | |
832 | ||
8836b995 | 833 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 834 | { |
602adf40 | 835 | |
e86924a8 | 836 | struct rbd_snap *snap; |
602adf40 | 837 | |
e86924a8 AE |
838 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
839 | if (!strcmp(snap_name, snap->name)) { | |
0d7dbfce | 840 | rbd_dev->spec->snap_id = snap->id; |
e86924a8 | 841 | rbd_dev->mapping.size = snap->size; |
34b13184 | 842 | rbd_dev->mapping.features = snap->features; |
602adf40 | 843 | |
e86924a8 | 844 | return 0; |
00f1f36f | 845 | } |
00f1f36f | 846 | } |
e86924a8 | 847 | |
00f1f36f | 848 | return -ENOENT; |
602adf40 YS |
849 | } |
850 | ||
819d52bf | 851 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) |
602adf40 | 852 | { |
78dc447d | 853 | int ret; |
602adf40 | 854 | |
0d7dbfce | 855 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 856 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0d7dbfce | 857 | rbd_dev->spec->snap_id = CEPH_NOSNAP; |
99c1f08f | 858 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 859 | rbd_dev->mapping.features = rbd_dev->header.features; |
e86924a8 | 860 | ret = 0; |
602adf40 | 861 | } else { |
0d7dbfce | 862 | ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); |
602adf40 YS |
863 | if (ret < 0) |
864 | goto done; | |
f84344f3 | 865 | rbd_dev->mapping.read_only = true; |
602adf40 | 866 | } |
6d292906 AE |
867 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
868 | ||
602adf40 | 869 | done: |
602adf40 YS |
870 | return ret; |
871 | } | |
872 | ||
873 | static void rbd_header_free(struct rbd_image_header *header) | |
874 | { | |
849b4260 | 875 | kfree(header->object_prefix); |
d78fd7ae | 876 | header->object_prefix = NULL; |
602adf40 | 877 | kfree(header->snap_sizes); |
d78fd7ae | 878 | header->snap_sizes = NULL; |
849b4260 | 879 | kfree(header->snap_names); |
d78fd7ae | 880 | header->snap_names = NULL; |
d1d25646 | 881 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 882 | header->snapc = NULL; |
602adf40 YS |
883 | } |
884 | ||
98571b5a | 885 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 886 | { |
65ccfe21 AE |
887 | char *name; |
888 | u64 segment; | |
889 | int ret; | |
602adf40 | 890 | |
2fd82b9e | 891 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
892 | if (!name) |
893 | return NULL; | |
894 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 895 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 896 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 897 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
898 | pr_err("error formatting segment name for #%llu (%d)\n", |
899 | segment, ret); | |
900 | kfree(name); | |
901 | name = NULL; | |
902 | } | |
602adf40 | 903 | |
65ccfe21 AE |
904 | return name; |
905 | } | |
602adf40 | 906 | |
65ccfe21 AE |
907 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
908 | { | |
909 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 910 | |
65ccfe21 AE |
911 | return offset & (segment_size - 1); |
912 | } | |
913 | ||
914 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
915 | u64 offset, u64 length) | |
916 | { | |
917 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
918 | ||
919 | offset &= segment_size - 1; | |
920 | ||
aafb230e | 921 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
922 | if (offset + length > segment_size) |
923 | length = segment_size - offset; | |
924 | ||
925 | return length; | |
602adf40 YS |
926 | } |
927 | ||
029bcbd8 JD |
928 | /* |
929 | * returns the size of an object in the image | |
930 | */ | |
931 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
932 | { | |
933 | return 1 << header->obj_order; | |
934 | } | |
935 | ||
602adf40 YS |
936 | /* |
937 | * bio helpers | |
938 | */ | |
939 | ||
940 | static void bio_chain_put(struct bio *chain) | |
941 | { | |
942 | struct bio *tmp; | |
943 | ||
944 | while (chain) { | |
945 | tmp = chain; | |
946 | chain = chain->bi_next; | |
947 | bio_put(tmp); | |
948 | } | |
949 | } | |
950 | ||
951 | /* | |
952 | * zeros a bio chain, starting at specific offset | |
953 | */ | |
954 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
955 | { | |
956 | struct bio_vec *bv; | |
957 | unsigned long flags; | |
958 | void *buf; | |
959 | int i; | |
960 | int pos = 0; | |
961 | ||
962 | while (chain) { | |
963 | bio_for_each_segment(bv, chain, i) { | |
964 | if (pos + bv->bv_len > start_ofs) { | |
965 | int remainder = max(start_ofs - pos, 0); | |
966 | buf = bvec_kmap_irq(bv, &flags); | |
967 | memset(buf + remainder, 0, | |
968 | bv->bv_len - remainder); | |
85b5aaa6 | 969 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
970 | } |
971 | pos += bv->bv_len; | |
972 | } | |
973 | ||
974 | chain = chain->bi_next; | |
975 | } | |
976 | } | |
977 | ||
b9434c5b AE |
978 | /* |
979 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
980 | * starting at the given byte offset from the start of the array and | |
981 | * continuing up to the given end offset. The pages array is | |
982 | * assumed to be big enough to hold all bytes up to the end. | |
983 | */ | |
984 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
985 | { | |
986 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
987 | ||
988 | rbd_assert(end > offset); | |
989 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
990 | while (offset < end) { | |
991 | size_t page_offset; | |
992 | size_t length; | |
993 | unsigned long flags; | |
994 | void *kaddr; | |
995 | ||
996 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
997 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
998 | local_irq_save(flags); | |
999 | kaddr = kmap_atomic(*page); | |
1000 | memset(kaddr + page_offset, 0, length); | |
1001 | kunmap_atomic(kaddr); | |
1002 | local_irq_restore(flags); | |
1003 | ||
1004 | offset += length; | |
1005 | page++; | |
1006 | } | |
1007 | } | |
1008 | ||
602adf40 | 1009 | /* |
f7760dad AE |
1010 | * Clone a portion of a bio, starting at the given byte offset |
1011 | * and continuing for the number of bytes indicated. | |
602adf40 | 1012 | */ |
f7760dad AE |
1013 | static struct bio *bio_clone_range(struct bio *bio_src, |
1014 | unsigned int offset, | |
1015 | unsigned int len, | |
1016 | gfp_t gfpmask) | |
602adf40 | 1017 | { |
f7760dad AE |
1018 | struct bio_vec *bv; |
1019 | unsigned int resid; | |
1020 | unsigned short idx; | |
1021 | unsigned int voff; | |
1022 | unsigned short end_idx; | |
1023 | unsigned short vcnt; | |
1024 | struct bio *bio; | |
1025 | ||
1026 | /* Handle the easy case for the caller */ | |
1027 | ||
1028 | if (!offset && len == bio_src->bi_size) | |
1029 | return bio_clone(bio_src, gfpmask); | |
1030 | ||
1031 | if (WARN_ON_ONCE(!len)) | |
1032 | return NULL; | |
1033 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1034 | return NULL; | |
1035 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1036 | return NULL; | |
1037 | ||
1038 | /* Find first affected segment... */ | |
1039 | ||
1040 | resid = offset; | |
1041 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1042 | if (resid < bv->bv_len) | |
1043 | break; | |
1044 | resid -= bv->bv_len; | |
602adf40 | 1045 | } |
f7760dad | 1046 | voff = resid; |
602adf40 | 1047 | |
f7760dad | 1048 | /* ...and the last affected segment */ |
602adf40 | 1049 | |
f7760dad AE |
1050 | resid += len; |
1051 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1052 | if (resid <= bv->bv_len) | |
1053 | break; | |
1054 | resid -= bv->bv_len; | |
1055 | } | |
1056 | vcnt = end_idx - idx + 1; | |
1057 | ||
1058 | /* Build the clone */ | |
1059 | ||
1060 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1061 | if (!bio) | |
1062 | return NULL; /* ENOMEM */ | |
602adf40 | 1063 | |
f7760dad AE |
1064 | bio->bi_bdev = bio_src->bi_bdev; |
1065 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1066 | bio->bi_rw = bio_src->bi_rw; | |
1067 | bio->bi_flags |= 1 << BIO_CLONED; | |
1068 | ||
1069 | /* | |
1070 | * Copy over our part of the bio_vec, then update the first | |
1071 | * and last (or only) entries. | |
1072 | */ | |
1073 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1074 | vcnt * sizeof (struct bio_vec)); | |
1075 | bio->bi_io_vec[0].bv_offset += voff; | |
1076 | if (vcnt > 1) { | |
1077 | bio->bi_io_vec[0].bv_len -= voff; | |
1078 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1079 | } else { | |
1080 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1081 | } |
1082 | ||
f7760dad AE |
1083 | bio->bi_vcnt = vcnt; |
1084 | bio->bi_size = len; | |
1085 | bio->bi_idx = 0; | |
1086 | ||
1087 | return bio; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Clone a portion of a bio chain, starting at the given byte offset | |
1092 | * into the first bio in the source chain and continuing for the | |
1093 | * number of bytes indicated. The result is another bio chain of | |
1094 | * exactly the given length, or a null pointer on error. | |
1095 | * | |
1096 | * The bio_src and offset parameters are both in-out. On entry they | |
1097 | * refer to the first source bio and the offset into that bio where | |
1098 | * the start of data to be cloned is located. | |
1099 | * | |
1100 | * On return, bio_src is updated to refer to the bio in the source | |
1101 | * chain that contains first un-cloned byte, and *offset will | |
1102 | * contain the offset of that byte within that bio. | |
1103 | */ | |
1104 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1105 | unsigned int *offset, | |
1106 | unsigned int len, | |
1107 | gfp_t gfpmask) | |
1108 | { | |
1109 | struct bio *bi = *bio_src; | |
1110 | unsigned int off = *offset; | |
1111 | struct bio *chain = NULL; | |
1112 | struct bio **end; | |
1113 | ||
1114 | /* Build up a chain of clone bios up to the limit */ | |
1115 | ||
1116 | if (!bi || off >= bi->bi_size || !len) | |
1117 | return NULL; /* Nothing to clone */ | |
602adf40 | 1118 | |
f7760dad AE |
1119 | end = &chain; |
1120 | while (len) { | |
1121 | unsigned int bi_size; | |
1122 | struct bio *bio; | |
1123 | ||
f5400b7a AE |
1124 | if (!bi) { |
1125 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1126 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1127 | } |
f7760dad AE |
1128 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1129 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1130 | if (!bio) | |
1131 | goto out_err; /* ENOMEM */ | |
1132 | ||
1133 | *end = bio; | |
1134 | end = &bio->bi_next; | |
602adf40 | 1135 | |
f7760dad AE |
1136 | off += bi_size; |
1137 | if (off == bi->bi_size) { | |
1138 | bi = bi->bi_next; | |
1139 | off = 0; | |
1140 | } | |
1141 | len -= bi_size; | |
1142 | } | |
1143 | *bio_src = bi; | |
1144 | *offset = off; | |
1145 | ||
1146 | return chain; | |
1147 | out_err: | |
1148 | bio_chain_put(chain); | |
602adf40 | 1149 | |
602adf40 YS |
1150 | return NULL; |
1151 | } | |
1152 | ||
926f9b3f AE |
1153 | /* |
1154 | * The default/initial value for all object request flags is 0. For | |
1155 | * each flag, once its value is set to 1 it is never reset to 0 | |
1156 | * again. | |
1157 | */ | |
57acbaa7 | 1158 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1159 | { |
57acbaa7 | 1160 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1161 | struct rbd_device *rbd_dev; |
1162 | ||
57acbaa7 AE |
1163 | rbd_dev = obj_request->img_request->rbd_dev; |
1164 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1165 | obj_request); |
1166 | } | |
1167 | } | |
1168 | ||
57acbaa7 | 1169 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1170 | { |
1171 | smp_mb(); | |
57acbaa7 | 1172 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1173 | } |
1174 | ||
57acbaa7 | 1175 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1176 | { |
57acbaa7 AE |
1177 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1178 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1179 | |
57acbaa7 AE |
1180 | if (obj_request_img_data_test(obj_request)) |
1181 | rbd_dev = obj_request->img_request->rbd_dev; | |
1182 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1183 | obj_request); |
1184 | } | |
1185 | } | |
1186 | ||
57acbaa7 | 1187 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1188 | { |
1189 | smp_mb(); | |
57acbaa7 | 1190 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1191 | } |
1192 | ||
5679c59f AE |
1193 | /* |
1194 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1195 | * flag. The latter is set based on the "exists" value provided. | |
1196 | * | |
1197 | * Note that for our purposes once an object exists it never goes | |
1198 | * away again. It's possible that the response from two existence | |
1199 | * checks are separated by the creation of the target object, and | |
1200 | * the first ("doesn't exist") response arrives *after* the second | |
1201 | * ("does exist"). In that case we ignore the second one. | |
1202 | */ | |
1203 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1204 | bool exists) | |
1205 | { | |
1206 | if (exists) | |
1207 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1208 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1209 | smp_mb(); | |
1210 | } | |
1211 | ||
1212 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1213 | { | |
1214 | smp_mb(); | |
1215 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1216 | } | |
1217 | ||
1218 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1219 | { | |
1220 | smp_mb(); | |
1221 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1222 | } | |
1223 | ||
bf0d5f50 AE |
1224 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1225 | { | |
37206ee5 AE |
1226 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1227 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1228 | kref_get(&obj_request->kref); |
1229 | } | |
1230 | ||
1231 | static void rbd_obj_request_destroy(struct kref *kref); | |
1232 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1233 | { | |
1234 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1235 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1236 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1237 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1238 | } | |
1239 | ||
1240 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1241 | { | |
37206ee5 AE |
1242 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1243 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1244 | kref_get(&img_request->kref); |
1245 | } | |
1246 | ||
1247 | static void rbd_img_request_destroy(struct kref *kref); | |
1248 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1249 | { | |
1250 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1251 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1252 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1253 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1254 | } | |
1255 | ||
1256 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1257 | struct rbd_obj_request *obj_request) | |
1258 | { | |
25dcf954 AE |
1259 | rbd_assert(obj_request->img_request == NULL); |
1260 | ||
b155e86c | 1261 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1262 | obj_request->img_request = img_request; |
25dcf954 | 1263 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1264 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1265 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1266 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1267 | img_request->obj_request_count++; |
1268 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1269 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1270 | obj_request->which); | |
bf0d5f50 AE |
1271 | } |
1272 | ||
1273 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1274 | struct rbd_obj_request *obj_request) | |
1275 | { | |
1276 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1277 | |
37206ee5 AE |
1278 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1279 | obj_request->which); | |
bf0d5f50 | 1280 | list_del(&obj_request->links); |
25dcf954 AE |
1281 | rbd_assert(img_request->obj_request_count > 0); |
1282 | img_request->obj_request_count--; | |
1283 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1284 | obj_request->which = BAD_WHICH; | |
6365d33a | 1285 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1286 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1287 | obj_request->img_request = NULL; |
25dcf954 | 1288 | obj_request->callback = NULL; |
bf0d5f50 AE |
1289 | rbd_obj_request_put(obj_request); |
1290 | } | |
1291 | ||
1292 | static bool obj_request_type_valid(enum obj_request_type type) | |
1293 | { | |
1294 | switch (type) { | |
9969ebc5 | 1295 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1296 | case OBJ_REQUEST_BIO: |
788e2df3 | 1297 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1298 | return true; |
1299 | default: | |
1300 | return false; | |
1301 | } | |
1302 | } | |
1303 | ||
bf0d5f50 AE |
1304 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1305 | struct rbd_obj_request *obj_request) | |
1306 | { | |
37206ee5 AE |
1307 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1308 | ||
bf0d5f50 AE |
1309 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1310 | } | |
1311 | ||
1312 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1313 | { | |
55f27e09 | 1314 | |
37206ee5 | 1315 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1316 | |
1317 | /* | |
1318 | * If no error occurred, compute the aggregate transfer | |
1319 | * count for the image request. We could instead use | |
1320 | * atomic64_cmpxchg() to update it as each object request | |
1321 | * completes; not clear which way is better off hand. | |
1322 | */ | |
1323 | if (!img_request->result) { | |
1324 | struct rbd_obj_request *obj_request; | |
1325 | u64 xferred = 0; | |
1326 | ||
1327 | for_each_obj_request(img_request, obj_request) | |
1328 | xferred += obj_request->xferred; | |
1329 | img_request->xferred = xferred; | |
1330 | } | |
1331 | ||
bf0d5f50 AE |
1332 | if (img_request->callback) |
1333 | img_request->callback(img_request); | |
1334 | else | |
1335 | rbd_img_request_put(img_request); | |
1336 | } | |
1337 | ||
788e2df3 AE |
1338 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1339 | ||
1340 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1341 | { | |
37206ee5 AE |
1342 | dout("%s: obj %p\n", __func__, obj_request); |
1343 | ||
788e2df3 AE |
1344 | return wait_for_completion_interruptible(&obj_request->completion); |
1345 | } | |
1346 | ||
0c425248 AE |
1347 | /* |
1348 | * The default/initial value for all image request flags is 0. Each | |
1349 | * is conditionally set to 1 at image request initialization time | |
1350 | * and currently never change thereafter. | |
1351 | */ | |
1352 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1353 | { | |
1354 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1355 | smp_mb(); | |
1356 | } | |
1357 | ||
1358 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1359 | { | |
1360 | smp_mb(); | |
1361 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1362 | } | |
1363 | ||
9849e986 AE |
1364 | static void img_request_child_set(struct rbd_img_request *img_request) |
1365 | { | |
1366 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1367 | smp_mb(); | |
1368 | } | |
1369 | ||
1370 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1371 | { | |
1372 | smp_mb(); | |
1373 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1374 | } | |
1375 | ||
d0b2e944 AE |
1376 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1377 | { | |
1378 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1379 | smp_mb(); | |
1380 | } | |
1381 | ||
1382 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1383 | { | |
1384 | smp_mb(); | |
1385 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1386 | } | |
1387 | ||
6e2a4505 AE |
1388 | static void |
1389 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1390 | { | |
b9434c5b AE |
1391 | u64 xferred = obj_request->xferred; |
1392 | u64 length = obj_request->length; | |
1393 | ||
6e2a4505 AE |
1394 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1395 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1396 | xferred, length); |
6e2a4505 AE |
1397 | /* |
1398 | * ENOENT means a hole in the image. We zero-fill the | |
1399 | * entire length of the request. A short read also implies | |
1400 | * zero-fill to the end of the request. Either way we | |
1401 | * update the xferred count to indicate the whole request | |
1402 | * was satisfied. | |
1403 | */ | |
b9434c5b | 1404 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1405 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1406 | if (obj_request->type == OBJ_REQUEST_BIO) |
1407 | zero_bio_chain(obj_request->bio_list, 0); | |
1408 | else | |
1409 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1410 | obj_request->result = 0; |
b9434c5b AE |
1411 | obj_request->xferred = length; |
1412 | } else if (xferred < length && !obj_request->result) { | |
1413 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1414 | zero_bio_chain(obj_request->bio_list, xferred); | |
1415 | else | |
1416 | zero_pages(obj_request->pages, xferred, length); | |
1417 | obj_request->xferred = length; | |
6e2a4505 AE |
1418 | } |
1419 | obj_request_done_set(obj_request); | |
1420 | } | |
1421 | ||
bf0d5f50 AE |
1422 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1423 | { | |
37206ee5 AE |
1424 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1425 | obj_request->callback); | |
bf0d5f50 AE |
1426 | if (obj_request->callback) |
1427 | obj_request->callback(obj_request); | |
788e2df3 AE |
1428 | else |
1429 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1430 | } |
1431 | ||
c47f9371 | 1432 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1433 | { |
1434 | dout("%s: obj %p\n", __func__, obj_request); | |
1435 | obj_request_done_set(obj_request); | |
1436 | } | |
1437 | ||
c47f9371 | 1438 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1439 | { |
57acbaa7 | 1440 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1441 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1442 | bool layered = false; |
1443 | ||
1444 | if (obj_request_img_data_test(obj_request)) { | |
1445 | img_request = obj_request->img_request; | |
1446 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1447 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1448 | } |
8b3e1a56 AE |
1449 | |
1450 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1451 | obj_request, img_request, obj_request->result, | |
1452 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1453 | if (layered && obj_request->result == -ENOENT && |
1454 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1455 | rbd_img_parent_read(obj_request); |
1456 | else if (img_request) | |
6e2a4505 AE |
1457 | rbd_img_obj_request_read_callback(obj_request); |
1458 | else | |
1459 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1460 | } |
1461 | ||
c47f9371 | 1462 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1463 | { |
1b83bef2 SW |
1464 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1465 | obj_request->result, obj_request->length); | |
1466 | /* | |
8b3e1a56 AE |
1467 | * There is no such thing as a successful short write. Set |
1468 | * it to our originally-requested length. | |
1b83bef2 SW |
1469 | */ |
1470 | obj_request->xferred = obj_request->length; | |
07741308 | 1471 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1472 | } |
1473 | ||
fbfab539 AE |
1474 | /* |
1475 | * For a simple stat call there's nothing to do. We'll do more if | |
1476 | * this is part of a write sequence for a layered image. | |
1477 | */ | |
c47f9371 | 1478 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1479 | { |
37206ee5 | 1480 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1481 | obj_request_done_set(obj_request); |
1482 | } | |
1483 | ||
bf0d5f50 AE |
1484 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1485 | struct ceph_msg *msg) | |
1486 | { | |
1487 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1488 | u16 opcode; |
1489 | ||
37206ee5 | 1490 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1491 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1492 | if (obj_request_img_data_test(obj_request)) { |
1493 | rbd_assert(obj_request->img_request); | |
1494 | rbd_assert(obj_request->which != BAD_WHICH); | |
1495 | } else { | |
1496 | rbd_assert(obj_request->which == BAD_WHICH); | |
1497 | } | |
bf0d5f50 | 1498 | |
1b83bef2 SW |
1499 | if (osd_req->r_result < 0) |
1500 | obj_request->result = osd_req->r_result; | |
bf0d5f50 AE |
1501 | obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); |
1502 | ||
0eefd470 | 1503 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1504 | |
c47f9371 AE |
1505 | /* |
1506 | * We support a 64-bit length, but ultimately it has to be | |
1507 | * passed to blk_end_request(), which takes an unsigned int. | |
1508 | */ | |
1b83bef2 | 1509 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1510 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1511 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1512 | switch (opcode) { |
1513 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1514 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1515 | break; |
1516 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1517 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1518 | break; |
fbfab539 | 1519 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1520 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1521 | break; |
36be9a76 | 1522 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1523 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1524 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1525 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1526 | break; |
bf0d5f50 AE |
1527 | default: |
1528 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1529 | obj_request->object_name, (unsigned short) opcode); | |
1530 | break; | |
1531 | } | |
1532 | ||
07741308 | 1533 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1534 | rbd_obj_request_complete(obj_request); |
1535 | } | |
1536 | ||
9d4df01f | 1537 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1538 | { |
1539 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1540 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1541 | u64 snap_id; |
430c28c3 | 1542 | |
8c042b0d | 1543 | rbd_assert(osd_req != NULL); |
430c28c3 | 1544 | |
9d4df01f | 1545 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1546 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1547 | NULL, snap_id, NULL); |
1548 | } | |
1549 | ||
1550 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1551 | { | |
1552 | struct rbd_img_request *img_request = obj_request->img_request; | |
1553 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1554 | struct ceph_snap_context *snapc; | |
1555 | struct timespec mtime = CURRENT_TIME; | |
1556 | ||
1557 | rbd_assert(osd_req != NULL); | |
1558 | ||
1559 | snapc = img_request ? img_request->snapc : NULL; | |
1560 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1561 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1562 | } |
1563 | ||
bf0d5f50 AE |
1564 | static struct ceph_osd_request *rbd_osd_req_create( |
1565 | struct rbd_device *rbd_dev, | |
1566 | bool write_request, | |
430c28c3 | 1567 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1568 | { |
bf0d5f50 AE |
1569 | struct ceph_snap_context *snapc = NULL; |
1570 | struct ceph_osd_client *osdc; | |
1571 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1572 | |
6365d33a AE |
1573 | if (obj_request_img_data_test(obj_request)) { |
1574 | struct rbd_img_request *img_request = obj_request->img_request; | |
1575 | ||
0c425248 AE |
1576 | rbd_assert(write_request == |
1577 | img_request_write_test(img_request)); | |
1578 | if (write_request) | |
bf0d5f50 | 1579 | snapc = img_request->snapc; |
bf0d5f50 AE |
1580 | } |
1581 | ||
1582 | /* Allocate and initialize the request, for the single op */ | |
1583 | ||
1584 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1585 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1586 | if (!osd_req) | |
1587 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1588 | |
430c28c3 | 1589 | if (write_request) |
bf0d5f50 | 1590 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1591 | else |
bf0d5f50 | 1592 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1593 | |
1594 | osd_req->r_callback = rbd_osd_req_callback; | |
1595 | osd_req->r_priv = obj_request; | |
1596 | ||
1597 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1598 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1599 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1600 | ||
1601 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1602 | ||
bf0d5f50 AE |
1603 | return osd_req; |
1604 | } | |
1605 | ||
0eefd470 AE |
1606 | /* |
1607 | * Create a copyup osd request based on the information in the | |
1608 | * object request supplied. A copyup request has two osd ops, | |
1609 | * a copyup method call, and a "normal" write request. | |
1610 | */ | |
1611 | static struct ceph_osd_request * | |
1612 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1613 | { | |
1614 | struct rbd_img_request *img_request; | |
1615 | struct ceph_snap_context *snapc; | |
1616 | struct rbd_device *rbd_dev; | |
1617 | struct ceph_osd_client *osdc; | |
1618 | struct ceph_osd_request *osd_req; | |
1619 | ||
1620 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1621 | img_request = obj_request->img_request; | |
1622 | rbd_assert(img_request); | |
1623 | rbd_assert(img_request_write_test(img_request)); | |
1624 | ||
1625 | /* Allocate and initialize the request, for the two ops */ | |
1626 | ||
1627 | snapc = img_request->snapc; | |
1628 | rbd_dev = img_request->rbd_dev; | |
1629 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1630 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1631 | if (!osd_req) | |
1632 | return NULL; /* ENOMEM */ | |
1633 | ||
1634 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1635 | osd_req->r_callback = rbd_osd_req_callback; | |
1636 | osd_req->r_priv = obj_request; | |
1637 | ||
1638 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1639 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1640 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1641 | ||
1642 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1643 | ||
1644 | return osd_req; | |
1645 | } | |
1646 | ||
1647 | ||
bf0d5f50 AE |
1648 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1649 | { | |
1650 | ceph_osdc_put_request(osd_req); | |
1651 | } | |
1652 | ||
1653 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1654 | ||
1655 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1656 | u64 offset, u64 length, | |
1657 | enum obj_request_type type) | |
1658 | { | |
1659 | struct rbd_obj_request *obj_request; | |
1660 | size_t size; | |
1661 | char *name; | |
1662 | ||
1663 | rbd_assert(obj_request_type_valid(type)); | |
1664 | ||
1665 | size = strlen(object_name) + 1; | |
1666 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1667 | if (!obj_request) | |
1668 | return NULL; | |
1669 | ||
1670 | name = (char *)(obj_request + 1); | |
1671 | obj_request->object_name = memcpy(name, object_name, size); | |
1672 | obj_request->offset = offset; | |
1673 | obj_request->length = length; | |
926f9b3f | 1674 | obj_request->flags = 0; |
bf0d5f50 AE |
1675 | obj_request->which = BAD_WHICH; |
1676 | obj_request->type = type; | |
1677 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1678 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1679 | kref_init(&obj_request->kref); |
1680 | ||
37206ee5 AE |
1681 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1682 | offset, length, (int)type, obj_request); | |
1683 | ||
bf0d5f50 AE |
1684 | return obj_request; |
1685 | } | |
1686 | ||
1687 | static void rbd_obj_request_destroy(struct kref *kref) | |
1688 | { | |
1689 | struct rbd_obj_request *obj_request; | |
1690 | ||
1691 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1692 | ||
37206ee5 AE |
1693 | dout("%s: obj %p\n", __func__, obj_request); |
1694 | ||
bf0d5f50 AE |
1695 | rbd_assert(obj_request->img_request == NULL); |
1696 | rbd_assert(obj_request->which == BAD_WHICH); | |
1697 | ||
1698 | if (obj_request->osd_req) | |
1699 | rbd_osd_req_destroy(obj_request->osd_req); | |
1700 | ||
1701 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1702 | switch (obj_request->type) { | |
9969ebc5 AE |
1703 | case OBJ_REQUEST_NODATA: |
1704 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1705 | case OBJ_REQUEST_BIO: |
1706 | if (obj_request->bio_list) | |
1707 | bio_chain_put(obj_request->bio_list); | |
1708 | break; | |
788e2df3 AE |
1709 | case OBJ_REQUEST_PAGES: |
1710 | if (obj_request->pages) | |
1711 | ceph_release_page_vector(obj_request->pages, | |
1712 | obj_request->page_count); | |
1713 | break; | |
bf0d5f50 AE |
1714 | } |
1715 | ||
1716 | kfree(obj_request); | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Caller is responsible for filling in the list of object requests | |
1721 | * that comprises the image request, and the Linux request pointer | |
1722 | * (if there is one). | |
1723 | */ | |
cc344fa1 AE |
1724 | static struct rbd_img_request *rbd_img_request_create( |
1725 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1726 | u64 offset, u64 length, |
9849e986 AE |
1727 | bool write_request, |
1728 | bool child_request) | |
bf0d5f50 AE |
1729 | { |
1730 | struct rbd_img_request *img_request; | |
1731 | struct ceph_snap_context *snapc = NULL; | |
1732 | ||
1733 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1734 | if (!img_request) | |
1735 | return NULL; | |
1736 | ||
1737 | if (write_request) { | |
1738 | down_read(&rbd_dev->header_rwsem); | |
1739 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); | |
1740 | up_read(&rbd_dev->header_rwsem); | |
1741 | if (WARN_ON(!snapc)) { | |
1742 | kfree(img_request); | |
1743 | return NULL; /* Shouldn't happen */ | |
1744 | } | |
0c425248 | 1745 | |
bf0d5f50 AE |
1746 | } |
1747 | ||
1748 | img_request->rq = NULL; | |
1749 | img_request->rbd_dev = rbd_dev; | |
1750 | img_request->offset = offset; | |
1751 | img_request->length = length; | |
0c425248 AE |
1752 | img_request->flags = 0; |
1753 | if (write_request) { | |
1754 | img_request_write_set(img_request); | |
bf0d5f50 | 1755 | img_request->snapc = snapc; |
0c425248 | 1756 | } else { |
bf0d5f50 | 1757 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1758 | } |
9849e986 AE |
1759 | if (child_request) |
1760 | img_request_child_set(img_request); | |
d0b2e944 AE |
1761 | if (rbd_dev->parent_spec) |
1762 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1763 | spin_lock_init(&img_request->completion_lock); |
1764 | img_request->next_completion = 0; | |
1765 | img_request->callback = NULL; | |
a5a337d4 | 1766 | img_request->result = 0; |
bf0d5f50 AE |
1767 | img_request->obj_request_count = 0; |
1768 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1769 | kref_init(&img_request->kref); | |
1770 | ||
1771 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1772 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1773 | ||
37206ee5 AE |
1774 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1775 | write_request ? "write" : "read", offset, length, | |
1776 | img_request); | |
1777 | ||
bf0d5f50 AE |
1778 | return img_request; |
1779 | } | |
1780 | ||
1781 | static void rbd_img_request_destroy(struct kref *kref) | |
1782 | { | |
1783 | struct rbd_img_request *img_request; | |
1784 | struct rbd_obj_request *obj_request; | |
1785 | struct rbd_obj_request *next_obj_request; | |
1786 | ||
1787 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1788 | ||
37206ee5 AE |
1789 | dout("%s: img %p\n", __func__, img_request); |
1790 | ||
bf0d5f50 AE |
1791 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1792 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1793 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1794 | |
0c425248 | 1795 | if (img_request_write_test(img_request)) |
bf0d5f50 AE |
1796 | ceph_put_snap_context(img_request->snapc); |
1797 | ||
8b3e1a56 AE |
1798 | if (img_request_child_test(img_request)) |
1799 | rbd_obj_request_put(img_request->obj_request); | |
1800 | ||
bf0d5f50 AE |
1801 | kfree(img_request); |
1802 | } | |
1803 | ||
1217857f AE |
1804 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1805 | { | |
6365d33a | 1806 | struct rbd_img_request *img_request; |
1217857f AE |
1807 | unsigned int xferred; |
1808 | int result; | |
8b3e1a56 | 1809 | bool more; |
1217857f | 1810 | |
6365d33a AE |
1811 | rbd_assert(obj_request_img_data_test(obj_request)); |
1812 | img_request = obj_request->img_request; | |
1813 | ||
1217857f AE |
1814 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1815 | xferred = (unsigned int)obj_request->xferred; | |
1816 | result = obj_request->result; | |
1817 | if (result) { | |
1818 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1819 | ||
1820 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1821 | img_request_write_test(img_request) ? "write" : "read", | |
1822 | obj_request->length, obj_request->img_offset, | |
1823 | obj_request->offset); | |
1824 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1825 | result, xferred); | |
1826 | if (!img_request->result) | |
1827 | img_request->result = result; | |
1828 | } | |
1829 | ||
f1a4739f AE |
1830 | /* Image object requests don't own their page array */ |
1831 | ||
1832 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1833 | obj_request->pages = NULL; | |
1834 | obj_request->page_count = 0; | |
1835 | } | |
1836 | ||
8b3e1a56 AE |
1837 | if (img_request_child_test(img_request)) { |
1838 | rbd_assert(img_request->obj_request != NULL); | |
1839 | more = obj_request->which < img_request->obj_request_count - 1; | |
1840 | } else { | |
1841 | rbd_assert(img_request->rq != NULL); | |
1842 | more = blk_end_request(img_request->rq, result, xferred); | |
1843 | } | |
1844 | ||
1845 | return more; | |
1217857f AE |
1846 | } |
1847 | ||
2169238d AE |
1848 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1849 | { | |
1850 | struct rbd_img_request *img_request; | |
1851 | u32 which = obj_request->which; | |
1852 | bool more = true; | |
1853 | ||
6365d33a | 1854 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1855 | img_request = obj_request->img_request; |
1856 | ||
1857 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1858 | rbd_assert(img_request != NULL); | |
2169238d AE |
1859 | rbd_assert(img_request->obj_request_count > 0); |
1860 | rbd_assert(which != BAD_WHICH); | |
1861 | rbd_assert(which < img_request->obj_request_count); | |
1862 | rbd_assert(which >= img_request->next_completion); | |
1863 | ||
1864 | spin_lock_irq(&img_request->completion_lock); | |
1865 | if (which != img_request->next_completion) | |
1866 | goto out; | |
1867 | ||
1868 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1869 | rbd_assert(more); |
1870 | rbd_assert(which < img_request->obj_request_count); | |
1871 | ||
1872 | if (!obj_request_done_test(obj_request)) | |
1873 | break; | |
1217857f | 1874 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1875 | which++; |
1876 | } | |
1877 | ||
1878 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1879 | img_request->next_completion = which; | |
1880 | out: | |
1881 | spin_unlock_irq(&img_request->completion_lock); | |
1882 | ||
1883 | if (!more) | |
1884 | rbd_img_request_complete(img_request); | |
1885 | } | |
1886 | ||
f1a4739f AE |
1887 | /* |
1888 | * Split up an image request into one or more object requests, each | |
1889 | * to a different object. The "type" parameter indicates whether | |
1890 | * "data_desc" is the pointer to the head of a list of bio | |
1891 | * structures, or the base of a page array. In either case this | |
1892 | * function assumes data_desc describes memory sufficient to hold | |
1893 | * all data described by the image request. | |
1894 | */ | |
1895 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1896 | enum obj_request_type type, | |
1897 | void *data_desc) | |
bf0d5f50 AE |
1898 | { |
1899 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1900 | struct rbd_obj_request *obj_request = NULL; | |
1901 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1902 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1903 | struct bio *bio_list; |
1904 | unsigned int bio_offset = 0; | |
1905 | struct page **pages; | |
7da22d29 | 1906 | u64 img_offset; |
bf0d5f50 AE |
1907 | u64 resid; |
1908 | u16 opcode; | |
1909 | ||
f1a4739f AE |
1910 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1911 | (int)type, data_desc); | |
37206ee5 | 1912 | |
430c28c3 | 1913 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1914 | img_offset = img_request->offset; |
bf0d5f50 | 1915 | resid = img_request->length; |
4dda41d3 | 1916 | rbd_assert(resid > 0); |
f1a4739f AE |
1917 | |
1918 | if (type == OBJ_REQUEST_BIO) { | |
1919 | bio_list = data_desc; | |
1920 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1921 | } else { | |
1922 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
1923 | pages = data_desc; | |
1924 | } | |
1925 | ||
bf0d5f50 | 1926 | while (resid) { |
2fa12320 | 1927 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 1928 | const char *object_name; |
bf0d5f50 AE |
1929 | u64 offset; |
1930 | u64 length; | |
1931 | ||
7da22d29 | 1932 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
1933 | if (!object_name) |
1934 | goto out_unwind; | |
7da22d29 AE |
1935 | offset = rbd_segment_offset(rbd_dev, img_offset); |
1936 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 1937 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 1938 | offset, length, type); |
bf0d5f50 AE |
1939 | kfree(object_name); /* object request has its own copy */ |
1940 | if (!obj_request) | |
1941 | goto out_unwind; | |
1942 | ||
f1a4739f AE |
1943 | if (type == OBJ_REQUEST_BIO) { |
1944 | unsigned int clone_size; | |
1945 | ||
1946 | rbd_assert(length <= (u64)UINT_MAX); | |
1947 | clone_size = (unsigned int)length; | |
1948 | obj_request->bio_list = | |
1949 | bio_chain_clone_range(&bio_list, | |
1950 | &bio_offset, | |
1951 | clone_size, | |
1952 | GFP_ATOMIC); | |
1953 | if (!obj_request->bio_list) | |
1954 | goto out_partial; | |
1955 | } else { | |
1956 | unsigned int page_count; | |
1957 | ||
1958 | obj_request->pages = pages; | |
1959 | page_count = (u32)calc_pages_for(offset, length); | |
1960 | obj_request->page_count = page_count; | |
1961 | if ((offset + length) & ~PAGE_MASK) | |
1962 | page_count--; /* more on last page */ | |
1963 | pages += page_count; | |
1964 | } | |
bf0d5f50 | 1965 | |
2fa12320 AE |
1966 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
1967 | obj_request); | |
1968 | if (!osd_req) | |
bf0d5f50 | 1969 | goto out_partial; |
2fa12320 | 1970 | obj_request->osd_req = osd_req; |
2169238d | 1971 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 1972 | |
2fa12320 AE |
1973 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
1974 | 0, 0); | |
f1a4739f AE |
1975 | if (type == OBJ_REQUEST_BIO) |
1976 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
1977 | obj_request->bio_list, length); | |
1978 | else | |
1979 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
1980 | obj_request->pages, length, | |
1981 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
1982 | |
1983 | if (write_request) | |
1984 | rbd_osd_req_format_write(obj_request); | |
1985 | else | |
1986 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 1987 | |
7da22d29 | 1988 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
1989 | rbd_img_obj_request_add(img_request, obj_request); |
1990 | ||
7da22d29 | 1991 | img_offset += length; |
bf0d5f50 AE |
1992 | resid -= length; |
1993 | } | |
1994 | ||
1995 | return 0; | |
1996 | ||
1997 | out_partial: | |
1998 | rbd_obj_request_put(obj_request); | |
1999 | out_unwind: | |
2000 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
2001 | rbd_obj_request_put(obj_request); | |
2002 | ||
2003 | return -ENOMEM; | |
2004 | } | |
2005 | ||
0eefd470 AE |
2006 | static void |
2007 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2008 | { | |
2009 | struct rbd_img_request *img_request; | |
2010 | struct rbd_device *rbd_dev; | |
2011 | u64 length; | |
2012 | u32 page_count; | |
2013 | ||
2014 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2015 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2016 | img_request = obj_request->img_request; | |
2017 | rbd_assert(img_request); | |
2018 | ||
2019 | rbd_dev = img_request->rbd_dev; | |
2020 | rbd_assert(rbd_dev); | |
2021 | length = (u64)1 << rbd_dev->header.obj_order; | |
2022 | page_count = (u32)calc_pages_for(0, length); | |
2023 | ||
2024 | rbd_assert(obj_request->copyup_pages); | |
2025 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2026 | obj_request->copyup_pages = NULL; | |
2027 | ||
2028 | /* | |
2029 | * We want the transfer count to reflect the size of the | |
2030 | * original write request. There is no such thing as a | |
2031 | * successful short write, so if the request was successful | |
2032 | * we can just set it to the originally-requested length. | |
2033 | */ | |
2034 | if (!obj_request->result) | |
2035 | obj_request->xferred = obj_request->length; | |
2036 | ||
2037 | /* Finish up with the normal image object callback */ | |
2038 | ||
2039 | rbd_img_obj_callback(obj_request); | |
2040 | } | |
2041 | ||
3d7efd18 AE |
2042 | static void |
2043 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2044 | { | |
2045 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2046 | struct ceph_osd_request *osd_req; |
2047 | struct ceph_osd_client *osdc; | |
2048 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2049 | struct page **pages; |
3d7efd18 AE |
2050 | int result; |
2051 | u64 obj_size; | |
2052 | u64 xferred; | |
2053 | ||
2054 | rbd_assert(img_request_child_test(img_request)); | |
2055 | ||
2056 | /* First get what we need from the image request */ | |
2057 | ||
2058 | pages = img_request->copyup_pages; | |
2059 | rbd_assert(pages != NULL); | |
2060 | img_request->copyup_pages = NULL; | |
2061 | ||
2062 | orig_request = img_request->obj_request; | |
2063 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2064 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2065 | result = img_request->result; |
2066 | obj_size = img_request->length; | |
2067 | xferred = img_request->xferred; | |
2068 | ||
0eefd470 AE |
2069 | rbd_dev = img_request->rbd_dev; |
2070 | rbd_assert(rbd_dev); | |
2071 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2072 | ||
3d7efd18 AE |
2073 | rbd_img_request_put(img_request); |
2074 | ||
0eefd470 AE |
2075 | if (result) |
2076 | goto out_err; | |
2077 | ||
2078 | /* Allocate the new copyup osd request for the original request */ | |
2079 | ||
2080 | result = -ENOMEM; | |
2081 | rbd_assert(!orig_request->osd_req); | |
2082 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2083 | if (!osd_req) | |
2084 | goto out_err; | |
2085 | orig_request->osd_req = osd_req; | |
2086 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2087 | |
0eefd470 | 2088 | /* Initialize the copyup op */ |
3d7efd18 | 2089 | |
0eefd470 AE |
2090 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2091 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2092 | false, false); | |
3d7efd18 | 2093 | |
0eefd470 AE |
2094 | /* Then the original write request op */ |
2095 | ||
2096 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2097 | orig_request->offset, | |
2098 | orig_request->length, 0, 0); | |
2099 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2100 | orig_request->length); | |
2101 | ||
2102 | rbd_osd_req_format_write(orig_request); | |
2103 | ||
2104 | /* All set, send it off. */ | |
2105 | ||
2106 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2107 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2108 | result = rbd_obj_request_submit(osdc, orig_request); | |
2109 | if (!result) | |
2110 | return; | |
2111 | out_err: | |
2112 | /* Record the error code and complete the request */ | |
2113 | ||
2114 | orig_request->result = result; | |
2115 | orig_request->xferred = 0; | |
2116 | obj_request_done_set(orig_request); | |
2117 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2118 | } |
2119 | ||
2120 | /* | |
2121 | * Read from the parent image the range of data that covers the | |
2122 | * entire target of the given object request. This is used for | |
2123 | * satisfying a layered image write request when the target of an | |
2124 | * object request from the image request does not exist. | |
2125 | * | |
2126 | * A page array big enough to hold the returned data is allocated | |
2127 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2128 | * When the read completes, this page array will be transferred to | |
2129 | * the original object request for the copyup operation. | |
2130 | * | |
2131 | * If an error occurs, record it as the result of the original | |
2132 | * object request and mark it done so it gets completed. | |
2133 | */ | |
2134 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2135 | { | |
2136 | struct rbd_img_request *img_request = NULL; | |
2137 | struct rbd_img_request *parent_request = NULL; | |
2138 | struct rbd_device *rbd_dev; | |
2139 | u64 img_offset; | |
2140 | u64 length; | |
2141 | struct page **pages = NULL; | |
2142 | u32 page_count; | |
2143 | int result; | |
2144 | ||
2145 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2146 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2147 | ||
2148 | img_request = obj_request->img_request; | |
2149 | rbd_assert(img_request != NULL); | |
2150 | rbd_dev = img_request->rbd_dev; | |
2151 | rbd_assert(rbd_dev->parent != NULL); | |
2152 | ||
0eefd470 AE |
2153 | /* |
2154 | * First things first. The original osd request is of no | |
2155 | * use to use any more, we'll need a new one that can hold | |
2156 | * the two ops in a copyup request. We'll get that later, | |
2157 | * but for now we can release the old one. | |
2158 | */ | |
2159 | rbd_osd_req_destroy(obj_request->osd_req); | |
2160 | obj_request->osd_req = NULL; | |
2161 | ||
3d7efd18 AE |
2162 | /* |
2163 | * Determine the byte range covered by the object in the | |
2164 | * child image to which the original request was to be sent. | |
2165 | */ | |
2166 | img_offset = obj_request->img_offset - obj_request->offset; | |
2167 | length = (u64)1 << rbd_dev->header.obj_order; | |
2168 | ||
a9e8ba2c AE |
2169 | /* |
2170 | * There is no defined parent data beyond the parent | |
2171 | * overlap, so limit what we read at that boundary if | |
2172 | * necessary. | |
2173 | */ | |
2174 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2175 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2176 | length = rbd_dev->parent_overlap - img_offset; | |
2177 | } | |
2178 | ||
3d7efd18 AE |
2179 | /* |
2180 | * Allocate a page array big enough to receive the data read | |
2181 | * from the parent. | |
2182 | */ | |
2183 | page_count = (u32)calc_pages_for(0, length); | |
2184 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2185 | if (IS_ERR(pages)) { | |
2186 | result = PTR_ERR(pages); | |
2187 | pages = NULL; | |
2188 | goto out_err; | |
2189 | } | |
2190 | ||
2191 | result = -ENOMEM; | |
2192 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2193 | img_offset, length, | |
2194 | false, true); | |
2195 | if (!parent_request) | |
2196 | goto out_err; | |
2197 | rbd_obj_request_get(obj_request); | |
2198 | parent_request->obj_request = obj_request; | |
2199 | ||
2200 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2201 | if (result) | |
2202 | goto out_err; | |
2203 | parent_request->copyup_pages = pages; | |
2204 | ||
2205 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2206 | result = rbd_img_request_submit(parent_request); | |
2207 | if (!result) | |
2208 | return 0; | |
2209 | ||
2210 | parent_request->copyup_pages = NULL; | |
2211 | parent_request->obj_request = NULL; | |
2212 | rbd_obj_request_put(obj_request); | |
2213 | out_err: | |
2214 | if (pages) | |
2215 | ceph_release_page_vector(pages, page_count); | |
2216 | if (parent_request) | |
2217 | rbd_img_request_put(parent_request); | |
2218 | obj_request->result = result; | |
2219 | obj_request->xferred = 0; | |
2220 | obj_request_done_set(obj_request); | |
2221 | ||
2222 | return result; | |
2223 | } | |
2224 | ||
c5b5ef6c AE |
2225 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2226 | { | |
c5b5ef6c AE |
2227 | struct rbd_obj_request *orig_request; |
2228 | int result; | |
2229 | ||
2230 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2231 | ||
2232 | /* | |
2233 | * All we need from the object request is the original | |
2234 | * request and the result of the STAT op. Grab those, then | |
2235 | * we're done with the request. | |
2236 | */ | |
2237 | orig_request = obj_request->obj_request; | |
2238 | obj_request->obj_request = NULL; | |
2239 | rbd_assert(orig_request); | |
2240 | rbd_assert(orig_request->img_request); | |
2241 | ||
2242 | result = obj_request->result; | |
2243 | obj_request->result = 0; | |
2244 | ||
2245 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2246 | obj_request, orig_request, result, | |
2247 | obj_request->xferred, obj_request->length); | |
2248 | rbd_obj_request_put(obj_request); | |
2249 | ||
2250 | rbd_assert(orig_request); | |
2251 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2252 | |
2253 | /* | |
2254 | * Our only purpose here is to determine whether the object | |
2255 | * exists, and we don't want to treat the non-existence as | |
2256 | * an error. If something else comes back, transfer the | |
2257 | * error to the original request and complete it now. | |
2258 | */ | |
2259 | if (!result) { | |
2260 | obj_request_existence_set(orig_request, true); | |
2261 | } else if (result == -ENOENT) { | |
2262 | obj_request_existence_set(orig_request, false); | |
2263 | } else if (result) { | |
2264 | orig_request->result = result; | |
3d7efd18 | 2265 | goto out; |
c5b5ef6c AE |
2266 | } |
2267 | ||
2268 | /* | |
2269 | * Resubmit the original request now that we have recorded | |
2270 | * whether the target object exists. | |
2271 | */ | |
b454e36d | 2272 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2273 | out: |
c5b5ef6c AE |
2274 | if (orig_request->result) |
2275 | rbd_obj_request_complete(orig_request); | |
2276 | rbd_obj_request_put(orig_request); | |
2277 | } | |
2278 | ||
2279 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2280 | { | |
2281 | struct rbd_obj_request *stat_request; | |
2282 | struct rbd_device *rbd_dev; | |
2283 | struct ceph_osd_client *osdc; | |
2284 | struct page **pages = NULL; | |
2285 | u32 page_count; | |
2286 | size_t size; | |
2287 | int ret; | |
2288 | ||
2289 | /* | |
2290 | * The response data for a STAT call consists of: | |
2291 | * le64 length; | |
2292 | * struct { | |
2293 | * le32 tv_sec; | |
2294 | * le32 tv_nsec; | |
2295 | * } mtime; | |
2296 | */ | |
2297 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2298 | page_count = (u32)calc_pages_for(0, size); | |
2299 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2300 | if (IS_ERR(pages)) | |
2301 | return PTR_ERR(pages); | |
2302 | ||
2303 | ret = -ENOMEM; | |
2304 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2305 | OBJ_REQUEST_PAGES); | |
2306 | if (!stat_request) | |
2307 | goto out; | |
2308 | ||
2309 | rbd_obj_request_get(obj_request); | |
2310 | stat_request->obj_request = obj_request; | |
2311 | stat_request->pages = pages; | |
2312 | stat_request->page_count = page_count; | |
2313 | ||
2314 | rbd_assert(obj_request->img_request); | |
2315 | rbd_dev = obj_request->img_request->rbd_dev; | |
2316 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2317 | stat_request); | |
2318 | if (!stat_request->osd_req) | |
2319 | goto out; | |
2320 | stat_request->callback = rbd_img_obj_exists_callback; | |
2321 | ||
2322 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2323 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2324 | false, false); | |
9d4df01f | 2325 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2326 | |
2327 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2328 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2329 | out: | |
2330 | if (ret) | |
2331 | rbd_obj_request_put(obj_request); | |
2332 | ||
2333 | return ret; | |
2334 | } | |
2335 | ||
b454e36d AE |
2336 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2337 | { | |
2338 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2339 | struct rbd_device *rbd_dev; |
3d7efd18 | 2340 | bool known; |
b454e36d AE |
2341 | |
2342 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2343 | ||
2344 | img_request = obj_request->img_request; | |
2345 | rbd_assert(img_request); | |
a9e8ba2c | 2346 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2347 | |
b454e36d | 2348 | /* |
a9e8ba2c AE |
2349 | * Only writes to layered images need special handling. |
2350 | * Reads and non-layered writes are simple object requests. | |
2351 | * Layered writes that start beyond the end of the overlap | |
2352 | * with the parent have no parent data, so they too are | |
2353 | * simple object requests. Finally, if the target object is | |
2354 | * known to already exist, its parent data has already been | |
2355 | * copied, so a write to the object can also be handled as a | |
2356 | * simple object request. | |
b454e36d AE |
2357 | */ |
2358 | if (!img_request_write_test(img_request) || | |
2359 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2360 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2361 | ((known = obj_request_known_test(obj_request)) && |
2362 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2363 | |
2364 | struct rbd_device *rbd_dev; | |
2365 | struct ceph_osd_client *osdc; | |
2366 | ||
2367 | rbd_dev = obj_request->img_request->rbd_dev; | |
2368 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2369 | ||
2370 | return rbd_obj_request_submit(osdc, obj_request); | |
2371 | } | |
2372 | ||
2373 | /* | |
3d7efd18 AE |
2374 | * It's a layered write. The target object might exist but |
2375 | * we may not know that yet. If we know it doesn't exist, | |
2376 | * start by reading the data for the full target object from | |
2377 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2378 | */ |
3d7efd18 AE |
2379 | if (known) |
2380 | return rbd_img_obj_parent_read_full(obj_request); | |
2381 | ||
2382 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2383 | |
2384 | return rbd_img_obj_exists_submit(obj_request); | |
2385 | } | |
2386 | ||
bf0d5f50 AE |
2387 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2388 | { | |
bf0d5f50 | 2389 | struct rbd_obj_request *obj_request; |
46faeed4 | 2390 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2391 | |
37206ee5 | 2392 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2393 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2394 | int ret; |
2395 | ||
b454e36d | 2396 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2397 | if (ret) |
2398 | return ret; | |
bf0d5f50 AE |
2399 | } |
2400 | ||
2401 | return 0; | |
2402 | } | |
8b3e1a56 AE |
2403 | |
2404 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2405 | { | |
2406 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2407 | struct rbd_device *rbd_dev; |
2408 | u64 obj_end; | |
8b3e1a56 AE |
2409 | |
2410 | rbd_assert(img_request_child_test(img_request)); | |
2411 | ||
2412 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2413 | rbd_assert(obj_request); |
2414 | rbd_assert(obj_request->img_request); | |
2415 | ||
8b3e1a56 | 2416 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2417 | if (obj_request->result) |
2418 | goto out; | |
2419 | ||
2420 | /* | |
2421 | * We need to zero anything beyond the parent overlap | |
2422 | * boundary. Since rbd_img_obj_request_read_callback() | |
2423 | * will zero anything beyond the end of a short read, an | |
2424 | * easy way to do this is to pretend the data from the | |
2425 | * parent came up short--ending at the overlap boundary. | |
2426 | */ | |
2427 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2428 | obj_end = obj_request->img_offset + obj_request->length; | |
2429 | rbd_dev = obj_request->img_request->rbd_dev; | |
2430 | if (obj_end > rbd_dev->parent_overlap) { | |
2431 | u64 xferred = 0; | |
2432 | ||
2433 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2434 | xferred = rbd_dev->parent_overlap - | |
2435 | obj_request->img_offset; | |
8b3e1a56 | 2436 | |
a9e8ba2c AE |
2437 | obj_request->xferred = min(img_request->xferred, xferred); |
2438 | } else { | |
2439 | obj_request->xferred = img_request->xferred; | |
2440 | } | |
2441 | out: | |
8b3e1a56 AE |
2442 | rbd_img_obj_request_read_callback(obj_request); |
2443 | rbd_obj_request_complete(obj_request); | |
2444 | } | |
2445 | ||
2446 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2447 | { | |
2448 | struct rbd_device *rbd_dev; | |
2449 | struct rbd_img_request *img_request; | |
2450 | int result; | |
2451 | ||
2452 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2453 | rbd_assert(obj_request->img_request != NULL); | |
2454 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2455 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2456 | ||
2457 | rbd_dev = obj_request->img_request->rbd_dev; | |
2458 | rbd_assert(rbd_dev->parent != NULL); | |
2459 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2460 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2461 | obj_request->img_offset, | |
2462 | obj_request->length, | |
2463 | false, true); | |
2464 | result = -ENOMEM; | |
2465 | if (!img_request) | |
2466 | goto out_err; | |
2467 | ||
2468 | rbd_obj_request_get(obj_request); | |
2469 | img_request->obj_request = obj_request; | |
2470 | ||
f1a4739f AE |
2471 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2472 | obj_request->bio_list); | |
8b3e1a56 AE |
2473 | if (result) |
2474 | goto out_err; | |
2475 | ||
2476 | img_request->callback = rbd_img_parent_read_callback; | |
2477 | result = rbd_img_request_submit(img_request); | |
2478 | if (result) | |
2479 | goto out_err; | |
2480 | ||
2481 | return; | |
2482 | out_err: | |
2483 | if (img_request) | |
2484 | rbd_img_request_put(img_request); | |
2485 | obj_request->result = result; | |
2486 | obj_request->xferred = 0; | |
2487 | obj_request_done_set(obj_request); | |
2488 | } | |
bf0d5f50 | 2489 | |
cf81b60e | 2490 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, |
b8d70035 AE |
2491 | u64 ver, u64 notify_id) |
2492 | { | |
2493 | struct rbd_obj_request *obj_request; | |
2169238d | 2494 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2495 | int ret; |
2496 | ||
2497 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2498 | OBJ_REQUEST_NODATA); | |
2499 | if (!obj_request) | |
2500 | return -ENOMEM; | |
2501 | ||
2502 | ret = -ENOMEM; | |
430c28c3 | 2503 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2504 | if (!obj_request->osd_req) |
2505 | goto out; | |
2169238d | 2506 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2507 | |
c99d2d4a AE |
2508 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
2509 | notify_id, ver, 0); | |
9d4df01f | 2510 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2511 | |
b8d70035 | 2512 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2513 | out: |
cf81b60e AE |
2514 | if (ret) |
2515 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2516 | |
2517 | return ret; | |
2518 | } | |
2519 | ||
2520 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2521 | { | |
2522 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
2523 | u64 hver; | |
b8d70035 AE |
2524 | |
2525 | if (!rbd_dev) | |
2526 | return; | |
2527 | ||
37206ee5 | 2528 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
b8d70035 AE |
2529 | rbd_dev->header_name, (unsigned long long) notify_id, |
2530 | (unsigned int) opcode); | |
522a0cc0 | 2531 | (void)rbd_dev_refresh(rbd_dev, &hver); |
b8d70035 | 2532 | |
cf81b60e | 2533 | rbd_obj_notify_ack(rbd_dev, hver, notify_id); |
b8d70035 AE |
2534 | } |
2535 | ||
9969ebc5 AE |
2536 | /* |
2537 | * Request sync osd watch/unwatch. The value of "start" determines | |
2538 | * whether a watch request is being initiated or torn down. | |
2539 | */ | |
2540 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2541 | { | |
2542 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2543 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2544 | int ret; |
2545 | ||
2546 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2547 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2548 | ||
2549 | if (start) { | |
3c663bbd | 2550 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2551 | &rbd_dev->watch_event); |
2552 | if (ret < 0) | |
2553 | return ret; | |
8eb87565 | 2554 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2555 | } |
2556 | ||
2557 | ret = -ENOMEM; | |
2558 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2559 | OBJ_REQUEST_NODATA); | |
2560 | if (!obj_request) | |
2561 | goto out_cancel; | |
2562 | ||
430c28c3 AE |
2563 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2564 | if (!obj_request->osd_req) | |
2565 | goto out_cancel; | |
2566 | ||
8eb87565 | 2567 | if (start) |
975241af | 2568 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2569 | else |
6977c3f9 | 2570 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2571 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2572 | |
2573 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
2574 | rbd_dev->watch_event->cookie, | |
2575 | rbd_dev->header.obj_version, start); | |
9d4df01f | 2576 | rbd_osd_req_format_write(obj_request); |
2169238d | 2577 | |
9969ebc5 AE |
2578 | ret = rbd_obj_request_submit(osdc, obj_request); |
2579 | if (ret) | |
2580 | goto out_cancel; | |
2581 | ret = rbd_obj_request_wait(obj_request); | |
2582 | if (ret) | |
2583 | goto out_cancel; | |
9969ebc5 AE |
2584 | ret = obj_request->result; |
2585 | if (ret) | |
2586 | goto out_cancel; | |
2587 | ||
8eb87565 AE |
2588 | /* |
2589 | * A watch request is set to linger, so the underlying osd | |
2590 | * request won't go away until we unregister it. We retain | |
2591 | * a pointer to the object request during that time (in | |
2592 | * rbd_dev->watch_request), so we'll keep a reference to | |
2593 | * it. We'll drop that reference (below) after we've | |
2594 | * unregistered it. | |
2595 | */ | |
2596 | if (start) { | |
2597 | rbd_dev->watch_request = obj_request; | |
2598 | ||
2599 | return 0; | |
2600 | } | |
2601 | ||
2602 | /* We have successfully torn down the watch request */ | |
2603 | ||
2604 | rbd_obj_request_put(rbd_dev->watch_request); | |
2605 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2606 | out_cancel: |
2607 | /* Cancel the event if we're tearing down, or on error */ | |
2608 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2609 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2610 | if (obj_request) |
2611 | rbd_obj_request_put(obj_request); | |
2612 | ||
2613 | return ret; | |
2614 | } | |
2615 | ||
36be9a76 AE |
2616 | /* |
2617 | * Synchronous osd object method call | |
2618 | */ | |
2619 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2620 | const char *object_name, | |
2621 | const char *class_name, | |
2622 | const char *method_name, | |
4157976b | 2623 | const void *outbound, |
36be9a76 | 2624 | size_t outbound_size, |
4157976b | 2625 | void *inbound, |
36be9a76 AE |
2626 | size_t inbound_size, |
2627 | u64 *version) | |
2628 | { | |
2169238d | 2629 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2630 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2631 | struct page **pages; |
2632 | u32 page_count; | |
2633 | int ret; | |
2634 | ||
2635 | /* | |
6010a451 AE |
2636 | * Method calls are ultimately read operations. The result |
2637 | * should placed into the inbound buffer provided. They | |
2638 | * also supply outbound data--parameters for the object | |
2639 | * method. Currently if this is present it will be a | |
2640 | * snapshot id. | |
36be9a76 | 2641 | */ |
57385b51 | 2642 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
2643 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2644 | if (IS_ERR(pages)) | |
2645 | return PTR_ERR(pages); | |
2646 | ||
2647 | ret = -ENOMEM; | |
6010a451 | 2648 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2649 | OBJ_REQUEST_PAGES); |
2650 | if (!obj_request) | |
2651 | goto out; | |
2652 | ||
2653 | obj_request->pages = pages; | |
2654 | obj_request->page_count = page_count; | |
2655 | ||
430c28c3 | 2656 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2657 | if (!obj_request->osd_req) |
2658 | goto out; | |
2659 | ||
c99d2d4a | 2660 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2661 | class_name, method_name); |
2662 | if (outbound_size) { | |
2663 | struct ceph_pagelist *pagelist; | |
2664 | ||
2665 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2666 | if (!pagelist) | |
2667 | goto out; | |
2668 | ||
2669 | ceph_pagelist_init(pagelist); | |
2670 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2671 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2672 | pagelist); | |
2673 | } | |
a4ce40a9 AE |
2674 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2675 | obj_request->pages, inbound_size, | |
44cd188d | 2676 | 0, false, false); |
9d4df01f | 2677 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2678 | |
36be9a76 AE |
2679 | ret = rbd_obj_request_submit(osdc, obj_request); |
2680 | if (ret) | |
2681 | goto out; | |
2682 | ret = rbd_obj_request_wait(obj_request); | |
2683 | if (ret) | |
2684 | goto out; | |
2685 | ||
2686 | ret = obj_request->result; | |
2687 | if (ret < 0) | |
2688 | goto out; | |
57385b51 AE |
2689 | |
2690 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
2691 | ret = (int)obj_request->xferred; | |
903bb32e | 2692 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2693 | if (version) |
2694 | *version = obj_request->version; | |
2695 | out: | |
2696 | if (obj_request) | |
2697 | rbd_obj_request_put(obj_request); | |
2698 | else | |
2699 | ceph_release_page_vector(pages, page_count); | |
2700 | ||
2701 | return ret; | |
2702 | } | |
2703 | ||
bf0d5f50 | 2704 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2705 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2706 | { |
2707 | struct rbd_device *rbd_dev = q->queuedata; | |
2708 | bool read_only = rbd_dev->mapping.read_only; | |
2709 | struct request *rq; | |
2710 | int result; | |
2711 | ||
2712 | while ((rq = blk_fetch_request(q))) { | |
2713 | bool write_request = rq_data_dir(rq) == WRITE; | |
2714 | struct rbd_img_request *img_request; | |
2715 | u64 offset; | |
2716 | u64 length; | |
2717 | ||
2718 | /* Ignore any non-FS requests that filter through. */ | |
2719 | ||
2720 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2721 | dout("%s: non-fs request type %d\n", __func__, |
2722 | (int) rq->cmd_type); | |
2723 | __blk_end_request_all(rq, 0); | |
2724 | continue; | |
2725 | } | |
2726 | ||
2727 | /* Ignore/skip any zero-length requests */ | |
2728 | ||
2729 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2730 | length = (u64) blk_rq_bytes(rq); | |
2731 | ||
2732 | if (!length) { | |
2733 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2734 | __blk_end_request_all(rq, 0); |
2735 | continue; | |
2736 | } | |
2737 | ||
2738 | spin_unlock_irq(q->queue_lock); | |
2739 | ||
2740 | /* Disallow writes to a read-only device */ | |
2741 | ||
2742 | if (write_request) { | |
2743 | result = -EROFS; | |
2744 | if (read_only) | |
2745 | goto end_request; | |
2746 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2747 | } | |
2748 | ||
6d292906 AE |
2749 | /* |
2750 | * Quit early if the mapped snapshot no longer | |
2751 | * exists. It's still possible the snapshot will | |
2752 | * have disappeared by the time our request arrives | |
2753 | * at the osd, but there's no sense in sending it if | |
2754 | * we already know. | |
2755 | */ | |
2756 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2757 | dout("request for non-existent snapshot"); |
2758 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2759 | result = -ENXIO; | |
2760 | goto end_request; | |
2761 | } | |
2762 | ||
bf0d5f50 AE |
2763 | result = -EINVAL; |
2764 | if (WARN_ON(offset && length > U64_MAX - offset + 1)) | |
2765 | goto end_request; /* Shouldn't happen */ | |
2766 | ||
2767 | result = -ENOMEM; | |
2768 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2769 | write_request, false); |
bf0d5f50 AE |
2770 | if (!img_request) |
2771 | goto end_request; | |
2772 | ||
2773 | img_request->rq = rq; | |
2774 | ||
f1a4739f AE |
2775 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2776 | rq->bio); | |
bf0d5f50 AE |
2777 | if (!result) |
2778 | result = rbd_img_request_submit(img_request); | |
2779 | if (result) | |
2780 | rbd_img_request_put(img_request); | |
2781 | end_request: | |
2782 | spin_lock_irq(q->queue_lock); | |
2783 | if (result < 0) { | |
7da22d29 AE |
2784 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2785 | write_request ? "write" : "read", | |
2786 | length, offset, result); | |
2787 | ||
bf0d5f50 AE |
2788 | __blk_end_request_all(rq, result); |
2789 | } | |
2790 | } | |
2791 | } | |
2792 | ||
602adf40 YS |
2793 | /* |
2794 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2795 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2796 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2797 | */ |
2798 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2799 | struct bio_vec *bvec) | |
2800 | { | |
2801 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2802 | sector_t sector_offset; |
2803 | sector_t sectors_per_obj; | |
2804 | sector_t obj_sector_offset; | |
2805 | int ret; | |
2806 | ||
2807 | /* | |
2808 | * Find how far into its rbd object the partition-relative | |
2809 | * bio start sector is to offset relative to the enclosing | |
2810 | * device. | |
2811 | */ | |
2812 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2813 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2814 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2815 | ||
2816 | /* | |
2817 | * Compute the number of bytes from that offset to the end | |
2818 | * of the object. Account for what's already used by the bio. | |
2819 | */ | |
2820 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2821 | if (ret > bmd->bi_size) | |
2822 | ret -= bmd->bi_size; | |
2823 | else | |
2824 | ret = 0; | |
2825 | ||
2826 | /* | |
2827 | * Don't send back more than was asked for. And if the bio | |
2828 | * was empty, let the whole thing through because: "Note | |
2829 | * that a block device *must* allow a single page to be | |
2830 | * added to an empty bio." | |
2831 | */ | |
2832 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2833 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2834 | ret = (int) bvec->bv_len; | |
2835 | ||
2836 | return ret; | |
602adf40 YS |
2837 | } |
2838 | ||
2839 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2840 | { | |
2841 | struct gendisk *disk = rbd_dev->disk; | |
2842 | ||
2843 | if (!disk) | |
2844 | return; | |
2845 | ||
602adf40 YS |
2846 | if (disk->flags & GENHD_FL_UP) |
2847 | del_gendisk(disk); | |
2848 | if (disk->queue) | |
2849 | blk_cleanup_queue(disk->queue); | |
2850 | put_disk(disk); | |
2851 | } | |
2852 | ||
788e2df3 AE |
2853 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2854 | const char *object_name, | |
2855 | u64 offset, u64 length, | |
80ef15bf | 2856 | void *buf, u64 *version) |
788e2df3 AE |
2857 | |
2858 | { | |
2169238d | 2859 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2860 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2861 | struct page **pages = NULL; |
2862 | u32 page_count; | |
1ceae7ef | 2863 | size_t size; |
788e2df3 AE |
2864 | int ret; |
2865 | ||
2866 | page_count = (u32) calc_pages_for(offset, length); | |
2867 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2868 | if (IS_ERR(pages)) | |
2869 | ret = PTR_ERR(pages); | |
2870 | ||
2871 | ret = -ENOMEM; | |
2872 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2873 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2874 | if (!obj_request) |
2875 | goto out; | |
2876 | ||
2877 | obj_request->pages = pages; | |
2878 | obj_request->page_count = page_count; | |
2879 | ||
430c28c3 | 2880 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2881 | if (!obj_request->osd_req) |
2882 | goto out; | |
2883 | ||
c99d2d4a AE |
2884 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2885 | offset, length, 0, 0); | |
406e2c9f | 2886 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2887 | obj_request->pages, |
44cd188d AE |
2888 | obj_request->length, |
2889 | obj_request->offset & ~PAGE_MASK, | |
2890 | false, false); | |
9d4df01f | 2891 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2892 | |
788e2df3 AE |
2893 | ret = rbd_obj_request_submit(osdc, obj_request); |
2894 | if (ret) | |
2895 | goto out; | |
2896 | ret = rbd_obj_request_wait(obj_request); | |
2897 | if (ret) | |
2898 | goto out; | |
2899 | ||
2900 | ret = obj_request->result; | |
2901 | if (ret < 0) | |
2902 | goto out; | |
1ceae7ef AE |
2903 | |
2904 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2905 | size = (size_t) obj_request->xferred; | |
903bb32e | 2906 | ceph_copy_from_page_vector(pages, buf, 0, size); |
23ed6e13 AE |
2907 | rbd_assert(size <= (size_t) INT_MAX); |
2908 | ret = (int) size; | |
788e2df3 AE |
2909 | if (version) |
2910 | *version = obj_request->version; | |
2911 | out: | |
2912 | if (obj_request) | |
2913 | rbd_obj_request_put(obj_request); | |
2914 | else | |
2915 | ceph_release_page_vector(pages, page_count); | |
2916 | ||
2917 | return ret; | |
2918 | } | |
2919 | ||
602adf40 | 2920 | /* |
4156d998 AE |
2921 | * Read the complete header for the given rbd device. |
2922 | * | |
2923 | * Returns a pointer to a dynamically-allocated buffer containing | |
2924 | * the complete and validated header. Caller can pass the address | |
2925 | * of a variable that will be filled in with the version of the | |
2926 | * header object at the time it was read. | |
2927 | * | |
2928 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2929 | */ |
4156d998 AE |
2930 | static struct rbd_image_header_ondisk * |
2931 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 2932 | { |
4156d998 | 2933 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2934 | u32 snap_count = 0; |
4156d998 AE |
2935 | u64 names_size = 0; |
2936 | u32 want_count; | |
2937 | int ret; | |
602adf40 | 2938 | |
00f1f36f | 2939 | /* |
4156d998 AE |
2940 | * The complete header will include an array of its 64-bit |
2941 | * snapshot ids, followed by the names of those snapshots as | |
2942 | * a contiguous block of NUL-terminated strings. Note that | |
2943 | * the number of snapshots could change by the time we read | |
2944 | * it in, in which case we re-read it. | |
00f1f36f | 2945 | */ |
4156d998 AE |
2946 | do { |
2947 | size_t size; | |
2948 | ||
2949 | kfree(ondisk); | |
2950 | ||
2951 | size = sizeof (*ondisk); | |
2952 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
2953 | size += names_size; | |
2954 | ondisk = kmalloc(size, GFP_KERNEL); | |
2955 | if (!ondisk) | |
2956 | return ERR_PTR(-ENOMEM); | |
2957 | ||
788e2df3 | 2958 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
80ef15bf | 2959 | 0, size, ondisk, version); |
4156d998 AE |
2960 | if (ret < 0) |
2961 | goto out_err; | |
2962 | if (WARN_ON((size_t) ret < size)) { | |
2963 | ret = -ENXIO; | |
06ecc6cb AE |
2964 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2965 | size, ret); | |
4156d998 AE |
2966 | goto out_err; |
2967 | } | |
2968 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
2969 | ret = -ENXIO; | |
06ecc6cb | 2970 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 2971 | goto out_err; |
81e759fb | 2972 | } |
602adf40 | 2973 | |
4156d998 AE |
2974 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2975 | want_count = snap_count; | |
2976 | snap_count = le32_to_cpu(ondisk->snap_count); | |
2977 | } while (snap_count != want_count); | |
00f1f36f | 2978 | |
4156d998 | 2979 | return ondisk; |
00f1f36f | 2980 | |
4156d998 AE |
2981 | out_err: |
2982 | kfree(ondisk); | |
2983 | ||
2984 | return ERR_PTR(ret); | |
2985 | } | |
2986 | ||
2987 | /* | |
2988 | * reload the ondisk the header | |
2989 | */ | |
2990 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
2991 | struct rbd_image_header *header) | |
2992 | { | |
2993 | struct rbd_image_header_ondisk *ondisk; | |
2994 | u64 ver = 0; | |
2995 | int ret; | |
602adf40 | 2996 | |
4156d998 AE |
2997 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
2998 | if (IS_ERR(ondisk)) | |
2999 | return PTR_ERR(ondisk); | |
3000 | ret = rbd_header_from_disk(header, ondisk); | |
3001 | if (ret >= 0) | |
3002 | header->obj_version = ver; | |
3003 | kfree(ondisk); | |
3004 | ||
3005 | return ret; | |
602adf40 YS |
3006 | } |
3007 | ||
41f38c2b | 3008 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
3009 | { |
3010 | struct rbd_snap *snap; | |
a0593290 | 3011 | struct rbd_snap *next; |
dfc5606d | 3012 | |
a0593290 | 3013 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
41f38c2b | 3014 | rbd_remove_snap_dev(snap); |
dfc5606d YS |
3015 | } |
3016 | ||
9478554a AE |
3017 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
3018 | { | |
3019 | sector_t size; | |
3020 | ||
0d7dbfce | 3021 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
3022 | return; |
3023 | ||
3024 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
3025 | dout("setting size to %llu sectors", (unsigned long long) size); | |
3026 | rbd_dev->mapping.size = (u64) size; | |
3027 | set_capacity(rbd_dev->disk, size); | |
3028 | } | |
3029 | ||
602adf40 YS |
3030 | /* |
3031 | * only read the first part of the ondisk header, without the snaps info | |
3032 | */ | |
117973fb | 3033 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
3034 | { |
3035 | int ret; | |
3036 | struct rbd_image_header h; | |
602adf40 YS |
3037 | |
3038 | ret = rbd_read_header(rbd_dev, &h); | |
3039 | if (ret < 0) | |
3040 | return ret; | |
3041 | ||
a51aa0c0 JD |
3042 | down_write(&rbd_dev->header_rwsem); |
3043 | ||
9478554a AE |
3044 | /* Update image size, and check for resize of mapped image */ |
3045 | rbd_dev->header.image_size = h.image_size; | |
3046 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 3047 | |
849b4260 | 3048 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3049 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3050 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
3051 | /* osd requests may still refer to snapc */ |
3052 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 3053 | |
b813623a AE |
3054 | if (hver) |
3055 | *hver = h.obj_version; | |
a71b891b | 3056 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 3057 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3058 | rbd_dev->header.snapc = h.snapc; |
3059 | rbd_dev->header.snap_names = h.snap_names; | |
3060 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
3061 | /* Free the extra copy of the object prefix */ |
3062 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
3063 | kfree(h.object_prefix); | |
3064 | ||
304f6808 | 3065 | ret = rbd_dev_snaps_update(rbd_dev); |
dfc5606d | 3066 | |
c666601a | 3067 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3068 | |
dfc5606d | 3069 | return ret; |
602adf40 YS |
3070 | } |
3071 | ||
117973fb | 3072 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
1fe5e993 AE |
3073 | { |
3074 | int ret; | |
3075 | ||
117973fb | 3076 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1fe5e993 | 3077 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb AE |
3078 | if (rbd_dev->image_format == 1) |
3079 | ret = rbd_dev_v1_refresh(rbd_dev, hver); | |
3080 | else | |
3081 | ret = rbd_dev_v2_refresh(rbd_dev, hver); | |
1fe5e993 | 3082 | mutex_unlock(&ctl_mutex); |
d98df63e | 3083 | revalidate_disk(rbd_dev->disk); |
522a0cc0 AE |
3084 | if (ret) |
3085 | rbd_warn(rbd_dev, "got notification but failed to " | |
3086 | " update snaps: %d\n", ret); | |
1fe5e993 AE |
3087 | |
3088 | return ret; | |
3089 | } | |
3090 | ||
602adf40 YS |
3091 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3092 | { | |
3093 | struct gendisk *disk; | |
3094 | struct request_queue *q; | |
593a9e7b | 3095 | u64 segment_size; |
602adf40 | 3096 | |
602adf40 | 3097 | /* create gendisk info */ |
602adf40 YS |
3098 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3099 | if (!disk) | |
1fcdb8aa | 3100 | return -ENOMEM; |
602adf40 | 3101 | |
f0f8cef5 | 3102 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3103 | rbd_dev->dev_id); |
602adf40 YS |
3104 | disk->major = rbd_dev->major; |
3105 | disk->first_minor = 0; | |
3106 | disk->fops = &rbd_bd_ops; | |
3107 | disk->private_data = rbd_dev; | |
3108 | ||
bf0d5f50 | 3109 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3110 | if (!q) |
3111 | goto out_disk; | |
029bcbd8 | 3112 | |
593a9e7b AE |
3113 | /* We use the default size, but let's be explicit about it. */ |
3114 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3115 | ||
029bcbd8 | 3116 | /* set io sizes to object size */ |
593a9e7b AE |
3117 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3118 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3119 | blk_queue_max_segment_size(q, segment_size); | |
3120 | blk_queue_io_min(q, segment_size); | |
3121 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3122 | |
602adf40 YS |
3123 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3124 | disk->queue = q; | |
3125 | ||
3126 | q->queuedata = rbd_dev; | |
3127 | ||
3128 | rbd_dev->disk = disk; | |
602adf40 | 3129 | |
12f02944 AE |
3130 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
3131 | ||
602adf40 | 3132 | return 0; |
602adf40 YS |
3133 | out_disk: |
3134 | put_disk(disk); | |
1fcdb8aa AE |
3135 | |
3136 | return -ENOMEM; | |
602adf40 YS |
3137 | } |
3138 | ||
dfc5606d YS |
3139 | /* |
3140 | sysfs | |
3141 | */ | |
3142 | ||
593a9e7b AE |
3143 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3144 | { | |
3145 | return container_of(dev, struct rbd_device, dev); | |
3146 | } | |
3147 | ||
dfc5606d YS |
3148 | static ssize_t rbd_size_show(struct device *dev, |
3149 | struct device_attribute *attr, char *buf) | |
3150 | { | |
593a9e7b | 3151 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
3152 | sector_t size; |
3153 | ||
3154 | down_read(&rbd_dev->header_rwsem); | |
3155 | size = get_capacity(rbd_dev->disk); | |
3156 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 3157 | |
a51aa0c0 | 3158 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
3159 | } |
3160 | ||
34b13184 AE |
3161 | /* |
3162 | * Note this shows the features for whatever's mapped, which is not | |
3163 | * necessarily the base image. | |
3164 | */ | |
3165 | static ssize_t rbd_features_show(struct device *dev, | |
3166 | struct device_attribute *attr, char *buf) | |
3167 | { | |
3168 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3169 | ||
3170 | return sprintf(buf, "0x%016llx\n", | |
3171 | (unsigned long long) rbd_dev->mapping.features); | |
3172 | } | |
3173 | ||
dfc5606d YS |
3174 | static ssize_t rbd_major_show(struct device *dev, |
3175 | struct device_attribute *attr, char *buf) | |
3176 | { | |
593a9e7b | 3177 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3178 | |
dfc5606d YS |
3179 | return sprintf(buf, "%d\n", rbd_dev->major); |
3180 | } | |
3181 | ||
3182 | static ssize_t rbd_client_id_show(struct device *dev, | |
3183 | struct device_attribute *attr, char *buf) | |
602adf40 | 3184 | { |
593a9e7b | 3185 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3186 | |
1dbb4399 AE |
3187 | return sprintf(buf, "client%lld\n", |
3188 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3189 | } |
3190 | ||
dfc5606d YS |
3191 | static ssize_t rbd_pool_show(struct device *dev, |
3192 | struct device_attribute *attr, char *buf) | |
602adf40 | 3193 | { |
593a9e7b | 3194 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3195 | |
0d7dbfce | 3196 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3197 | } |
3198 | ||
9bb2f334 AE |
3199 | static ssize_t rbd_pool_id_show(struct device *dev, |
3200 | struct device_attribute *attr, char *buf) | |
3201 | { | |
3202 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3203 | ||
0d7dbfce AE |
3204 | return sprintf(buf, "%llu\n", |
3205 | (unsigned long long) rbd_dev->spec->pool_id); | |
9bb2f334 AE |
3206 | } |
3207 | ||
dfc5606d YS |
3208 | static ssize_t rbd_name_show(struct device *dev, |
3209 | struct device_attribute *attr, char *buf) | |
3210 | { | |
593a9e7b | 3211 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3212 | |
a92ffdf8 AE |
3213 | if (rbd_dev->spec->image_name) |
3214 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3215 | ||
3216 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3217 | } |
3218 | ||
589d30e0 AE |
3219 | static ssize_t rbd_image_id_show(struct device *dev, |
3220 | struct device_attribute *attr, char *buf) | |
3221 | { | |
3222 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3223 | ||
0d7dbfce | 3224 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3225 | } |
3226 | ||
34b13184 AE |
3227 | /* |
3228 | * Shows the name of the currently-mapped snapshot (or | |
3229 | * RBD_SNAP_HEAD_NAME for the base image). | |
3230 | */ | |
dfc5606d YS |
3231 | static ssize_t rbd_snap_show(struct device *dev, |
3232 | struct device_attribute *attr, | |
3233 | char *buf) | |
3234 | { | |
593a9e7b | 3235 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3236 | |
0d7dbfce | 3237 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3238 | } |
3239 | ||
86b00e0d AE |
3240 | /* |
3241 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3242 | * for the parent image. If there is no parent, simply shows | |
3243 | * "(no parent image)". | |
3244 | */ | |
3245 | static ssize_t rbd_parent_show(struct device *dev, | |
3246 | struct device_attribute *attr, | |
3247 | char *buf) | |
3248 | { | |
3249 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3250 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3251 | int count; | |
3252 | char *bufp = buf; | |
3253 | ||
3254 | if (!spec) | |
3255 | return sprintf(buf, "(no parent image)\n"); | |
3256 | ||
3257 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3258 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3259 | if (count < 0) | |
3260 | return count; | |
3261 | bufp += count; | |
3262 | ||
3263 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3264 | spec->image_name ? spec->image_name : "(unknown)"); | |
3265 | if (count < 0) | |
3266 | return count; | |
3267 | bufp += count; | |
3268 | ||
3269 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3270 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3271 | if (count < 0) | |
3272 | return count; | |
3273 | bufp += count; | |
3274 | ||
3275 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3276 | if (count < 0) | |
3277 | return count; | |
3278 | bufp += count; | |
3279 | ||
3280 | return (ssize_t) (bufp - buf); | |
3281 | } | |
3282 | ||
dfc5606d YS |
3283 | static ssize_t rbd_image_refresh(struct device *dev, |
3284 | struct device_attribute *attr, | |
3285 | const char *buf, | |
3286 | size_t size) | |
3287 | { | |
593a9e7b | 3288 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3289 | int ret; |
602adf40 | 3290 | |
117973fb | 3291 | ret = rbd_dev_refresh(rbd_dev, NULL); |
b813623a AE |
3292 | |
3293 | return ret < 0 ? ret : size; | |
dfc5606d | 3294 | } |
602adf40 | 3295 | |
dfc5606d | 3296 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3297 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3298 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3299 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3300 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3301 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3302 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3303 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3304 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3305 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3306 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3307 | |
3308 | static struct attribute *rbd_attrs[] = { | |
3309 | &dev_attr_size.attr, | |
34b13184 | 3310 | &dev_attr_features.attr, |
dfc5606d YS |
3311 | &dev_attr_major.attr, |
3312 | &dev_attr_client_id.attr, | |
3313 | &dev_attr_pool.attr, | |
9bb2f334 | 3314 | &dev_attr_pool_id.attr, |
dfc5606d | 3315 | &dev_attr_name.attr, |
589d30e0 | 3316 | &dev_attr_image_id.attr, |
dfc5606d | 3317 | &dev_attr_current_snap.attr, |
86b00e0d | 3318 | &dev_attr_parent.attr, |
dfc5606d | 3319 | &dev_attr_refresh.attr, |
dfc5606d YS |
3320 | NULL |
3321 | }; | |
3322 | ||
3323 | static struct attribute_group rbd_attr_group = { | |
3324 | .attrs = rbd_attrs, | |
3325 | }; | |
3326 | ||
3327 | static const struct attribute_group *rbd_attr_groups[] = { | |
3328 | &rbd_attr_group, | |
3329 | NULL | |
3330 | }; | |
3331 | ||
3332 | static void rbd_sysfs_dev_release(struct device *dev) | |
3333 | { | |
3334 | } | |
3335 | ||
3336 | static struct device_type rbd_device_type = { | |
3337 | .name = "rbd", | |
3338 | .groups = rbd_attr_groups, | |
3339 | .release = rbd_sysfs_dev_release, | |
3340 | }; | |
3341 | ||
8b8fb99c AE |
3342 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3343 | { | |
3344 | kref_get(&spec->kref); | |
3345 | ||
3346 | return spec; | |
3347 | } | |
3348 | ||
3349 | static void rbd_spec_free(struct kref *kref); | |
3350 | static void rbd_spec_put(struct rbd_spec *spec) | |
3351 | { | |
3352 | if (spec) | |
3353 | kref_put(&spec->kref, rbd_spec_free); | |
3354 | } | |
3355 | ||
3356 | static struct rbd_spec *rbd_spec_alloc(void) | |
3357 | { | |
3358 | struct rbd_spec *spec; | |
3359 | ||
3360 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3361 | if (!spec) | |
3362 | return NULL; | |
3363 | kref_init(&spec->kref); | |
3364 | ||
8b8fb99c AE |
3365 | return spec; |
3366 | } | |
3367 | ||
3368 | static void rbd_spec_free(struct kref *kref) | |
3369 | { | |
3370 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3371 | ||
3372 | kfree(spec->pool_name); | |
3373 | kfree(spec->image_id); | |
3374 | kfree(spec->image_name); | |
3375 | kfree(spec->snap_name); | |
3376 | kfree(spec); | |
3377 | } | |
3378 | ||
cc344fa1 | 3379 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3380 | struct rbd_spec *spec) |
3381 | { | |
3382 | struct rbd_device *rbd_dev; | |
3383 | ||
3384 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3385 | if (!rbd_dev) | |
3386 | return NULL; | |
3387 | ||
3388 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3389 | rbd_dev->flags = 0; |
c53d5893 AE |
3390 | INIT_LIST_HEAD(&rbd_dev->node); |
3391 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
3392 | init_rwsem(&rbd_dev->header_rwsem); | |
3393 | ||
3394 | rbd_dev->spec = spec; | |
3395 | rbd_dev->rbd_client = rbdc; | |
3396 | ||
0903e875 AE |
3397 | /* Initialize the layout used for all rbd requests */ |
3398 | ||
3399 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3400 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3401 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3402 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3403 | ||
c53d5893 AE |
3404 | return rbd_dev; |
3405 | } | |
3406 | ||
3407 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3408 | { | |
86b00e0d | 3409 | rbd_spec_put(rbd_dev->parent_spec); |
c53d5893 AE |
3410 | kfree(rbd_dev->header_name); |
3411 | rbd_put_client(rbd_dev->rbd_client); | |
3412 | rbd_spec_put(rbd_dev->spec); | |
3413 | kfree(rbd_dev); | |
3414 | } | |
3415 | ||
41f38c2b | 3416 | static void rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
3417 | { |
3418 | list_del(&snap->node); | |
3e83b65b AE |
3419 | kfree(snap->name); |
3420 | kfree(snap); | |
dfc5606d YS |
3421 | } |
3422 | ||
4e891e0a | 3423 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 3424 | const char *snap_name, |
34b13184 AE |
3425 | u64 snap_id, u64 snap_size, |
3426 | u64 snap_features) | |
dfc5606d | 3427 | { |
4e891e0a | 3428 | struct rbd_snap *snap; |
dfc5606d | 3429 | int ret; |
4e891e0a AE |
3430 | |
3431 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 3432 | if (!snap) |
4e891e0a AE |
3433 | return ERR_PTR(-ENOMEM); |
3434 | ||
3435 | ret = -ENOMEM; | |
c8d18425 | 3436 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
3437 | if (!snap->name) |
3438 | goto err; | |
3439 | ||
c8d18425 AE |
3440 | snap->id = snap_id; |
3441 | snap->size = snap_size; | |
34b13184 | 3442 | snap->features = snap_features; |
4e891e0a AE |
3443 | |
3444 | return snap; | |
3445 | ||
dfc5606d YS |
3446 | err: |
3447 | kfree(snap->name); | |
3448 | kfree(snap); | |
4e891e0a AE |
3449 | |
3450 | return ERR_PTR(ret); | |
dfc5606d YS |
3451 | } |
3452 | ||
cd892126 AE |
3453 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
3454 | u64 *snap_size, u64 *snap_features) | |
3455 | { | |
3456 | char *snap_name; | |
3457 | ||
3458 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
3459 | ||
3460 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
3461 | *snap_features = 0; /* No features for v1 */ | |
3462 | ||
3463 | /* Skip over names until we find the one we are looking for */ | |
3464 | ||
3465 | snap_name = rbd_dev->header.snap_names; | |
3466 | while (which--) | |
3467 | snap_name += strlen(snap_name) + 1; | |
3468 | ||
3469 | return snap_name; | |
3470 | } | |
3471 | ||
9d475de5 AE |
3472 | /* |
3473 | * Get the size and object order for an image snapshot, or if | |
3474 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3475 | * image. | |
3476 | */ | |
3477 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3478 | u8 *order, u64 *snap_size) | |
3479 | { | |
3480 | __le64 snapid = cpu_to_le64(snap_id); | |
3481 | int ret; | |
3482 | struct { | |
3483 | u8 order; | |
3484 | __le64 size; | |
3485 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3486 | ||
36be9a76 | 3487 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3488 | "rbd", "get_size", |
4157976b AE |
3489 | &snapid, sizeof (snapid), |
3490 | &size_buf, sizeof (size_buf), NULL); | |
36be9a76 | 3491 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3492 | if (ret < 0) |
3493 | return ret; | |
57385b51 AE |
3494 | if (ret < sizeof (size_buf)) |
3495 | return -ERANGE; | |
9d475de5 AE |
3496 | |
3497 | *order = size_buf.order; | |
3498 | *snap_size = le64_to_cpu(size_buf.size); | |
3499 | ||
3500 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
57385b51 AE |
3501 | (unsigned long long)snap_id, (unsigned int)*order, |
3502 | (unsigned long long)*snap_size); | |
9d475de5 AE |
3503 | |
3504 | return 0; | |
3505 | } | |
3506 | ||
3507 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3508 | { | |
3509 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3510 | &rbd_dev->header.obj_order, | |
3511 | &rbd_dev->header.image_size); | |
3512 | } | |
3513 | ||
1e130199 AE |
3514 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3515 | { | |
3516 | void *reply_buf; | |
3517 | int ret; | |
3518 | void *p; | |
3519 | ||
3520 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3521 | if (!reply_buf) | |
3522 | return -ENOMEM; | |
3523 | ||
36be9a76 | 3524 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3525 | "rbd", "get_object_prefix", NULL, 0, |
07b2391f | 3526 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
36be9a76 | 3527 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3528 | if (ret < 0) |
3529 | goto out; | |
3530 | ||
3531 | p = reply_buf; | |
3532 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3533 | p + ret, NULL, GFP_NOIO); |
3534 | ret = 0; | |
1e130199 AE |
3535 | |
3536 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3537 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3538 | rbd_dev->header.object_prefix = NULL; | |
3539 | } else { | |
3540 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3541 | } | |
1e130199 AE |
3542 | out: |
3543 | kfree(reply_buf); | |
3544 | ||
3545 | return ret; | |
3546 | } | |
3547 | ||
b1b5402a AE |
3548 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3549 | u64 *snap_features) | |
3550 | { | |
3551 | __le64 snapid = cpu_to_le64(snap_id); | |
3552 | struct { | |
3553 | __le64 features; | |
3554 | __le64 incompat; | |
4157976b | 3555 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3556 | u64 incompat; |
b1b5402a AE |
3557 | int ret; |
3558 | ||
36be9a76 | 3559 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3560 | "rbd", "get_features", |
4157976b AE |
3561 | &snapid, sizeof (snapid), |
3562 | &features_buf, sizeof (features_buf), NULL); | |
36be9a76 | 3563 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3564 | if (ret < 0) |
3565 | return ret; | |
57385b51 AE |
3566 | if (ret < sizeof (features_buf)) |
3567 | return -ERANGE; | |
d889140c AE |
3568 | |
3569 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3570 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3571 | return -ENXIO; |
d889140c | 3572 | |
b1b5402a AE |
3573 | *snap_features = le64_to_cpu(features_buf.features); |
3574 | ||
3575 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
3576 | (unsigned long long)snap_id, |
3577 | (unsigned long long)*snap_features, | |
3578 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
3579 | |
3580 | return 0; | |
3581 | } | |
3582 | ||
3583 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3584 | { | |
3585 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3586 | &rbd_dev->header.features); | |
3587 | } | |
3588 | ||
86b00e0d AE |
3589 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3590 | { | |
3591 | struct rbd_spec *parent_spec; | |
3592 | size_t size; | |
3593 | void *reply_buf = NULL; | |
3594 | __le64 snapid; | |
3595 | void *p; | |
3596 | void *end; | |
3597 | char *image_id; | |
3598 | u64 overlap; | |
86b00e0d AE |
3599 | int ret; |
3600 | ||
3601 | parent_spec = rbd_spec_alloc(); | |
3602 | if (!parent_spec) | |
3603 | return -ENOMEM; | |
3604 | ||
3605 | size = sizeof (__le64) + /* pool_id */ | |
3606 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3607 | sizeof (__le64) + /* snap_id */ | |
3608 | sizeof (__le64); /* overlap */ | |
3609 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3610 | if (!reply_buf) { | |
3611 | ret = -ENOMEM; | |
3612 | goto out_err; | |
3613 | } | |
3614 | ||
3615 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3616 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 3617 | "rbd", "get_parent", |
4157976b AE |
3618 | &snapid, sizeof (snapid), |
3619 | reply_buf, size, NULL); | |
36be9a76 | 3620 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3621 | if (ret < 0) |
3622 | goto out_err; | |
3623 | ||
86b00e0d | 3624 | p = reply_buf; |
57385b51 AE |
3625 | end = reply_buf + ret; |
3626 | ret = -ERANGE; | |
86b00e0d AE |
3627 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
3628 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3629 | goto out; /* No parent? No problem. */ | |
3630 | ||
0903e875 AE |
3631 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3632 | ||
3633 | ret = -EIO; | |
57385b51 AE |
3634 | if (WARN_ON(parent_spec->pool_id > (u64)U32_MAX)) |
3635 | goto out_err; | |
0903e875 | 3636 | |
979ed480 | 3637 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3638 | if (IS_ERR(image_id)) { |
3639 | ret = PTR_ERR(image_id); | |
3640 | goto out_err; | |
3641 | } | |
3642 | parent_spec->image_id = image_id; | |
3643 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3644 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3645 | ||
3646 | rbd_dev->parent_overlap = overlap; | |
3647 | rbd_dev->parent_spec = parent_spec; | |
3648 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3649 | out: | |
3650 | ret = 0; | |
3651 | out_err: | |
3652 | kfree(reply_buf); | |
3653 | rbd_spec_put(parent_spec); | |
3654 | ||
3655 | return ret; | |
3656 | } | |
3657 | ||
cc070d59 AE |
3658 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
3659 | { | |
3660 | struct { | |
3661 | __le64 stripe_unit; | |
3662 | __le64 stripe_count; | |
3663 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
3664 | size_t size = sizeof (striping_info_buf); | |
3665 | void *p; | |
3666 | u64 obj_size; | |
3667 | u64 stripe_unit; | |
3668 | u64 stripe_count; | |
3669 | int ret; | |
3670 | ||
3671 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
3672 | "rbd", "get_stripe_unit_count", NULL, 0, | |
3673 | (char *)&striping_info_buf, size, NULL); | |
3674 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); | |
3675 | if (ret < 0) | |
3676 | return ret; | |
3677 | if (ret < size) | |
3678 | return -ERANGE; | |
3679 | ||
3680 | /* | |
3681 | * We don't actually support the "fancy striping" feature | |
3682 | * (STRIPINGV2) yet, but if the striping sizes are the | |
3683 | * defaults the behavior is the same as before. So find | |
3684 | * out, and only fail if the image has non-default values. | |
3685 | */ | |
3686 | ret = -EINVAL; | |
3687 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
3688 | p = &striping_info_buf; | |
3689 | stripe_unit = ceph_decode_64(&p); | |
3690 | if (stripe_unit != obj_size) { | |
3691 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
3692 | "(got %llu want %llu)", | |
3693 | stripe_unit, obj_size); | |
3694 | return -EINVAL; | |
3695 | } | |
3696 | stripe_count = ceph_decode_64(&p); | |
3697 | if (stripe_count != 1) { | |
3698 | rbd_warn(rbd_dev, "unsupported stripe count " | |
3699 | "(got %llu want 1)", stripe_count); | |
3700 | return -EINVAL; | |
3701 | } | |
3702 | rbd_dev->stripe_unit = stripe_unit; | |
3703 | rbd_dev->stripe_count = stripe_count; | |
3704 | ||
3705 | return 0; | |
3706 | } | |
3707 | ||
9e15b77d AE |
3708 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3709 | { | |
3710 | size_t image_id_size; | |
3711 | char *image_id; | |
3712 | void *p; | |
3713 | void *end; | |
3714 | size_t size; | |
3715 | void *reply_buf = NULL; | |
3716 | size_t len = 0; | |
3717 | char *image_name = NULL; | |
3718 | int ret; | |
3719 | ||
3720 | rbd_assert(!rbd_dev->spec->image_name); | |
3721 | ||
69e7a02f AE |
3722 | len = strlen(rbd_dev->spec->image_id); |
3723 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3724 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3725 | if (!image_id) | |
3726 | return NULL; | |
3727 | ||
3728 | p = image_id; | |
4157976b | 3729 | end = image_id + image_id_size; |
57385b51 | 3730 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
3731 | |
3732 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3733 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3734 | if (!reply_buf) | |
3735 | goto out; | |
3736 | ||
36be9a76 | 3737 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3738 | "rbd", "dir_get_name", |
3739 | image_id, image_id_size, | |
4157976b | 3740 | reply_buf, size, NULL); |
9e15b77d AE |
3741 | if (ret < 0) |
3742 | goto out; | |
3743 | p = reply_buf; | |
4157976b | 3744 | end = reply_buf + size; |
9e15b77d AE |
3745 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3746 | if (IS_ERR(image_name)) | |
3747 | image_name = NULL; | |
3748 | else | |
3749 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3750 | out: | |
3751 | kfree(reply_buf); | |
3752 | kfree(image_id); | |
3753 | ||
3754 | return image_name; | |
3755 | } | |
3756 | ||
3757 | /* | |
3758 | * When a parent image gets probed, we only have the pool, image, | |
3759 | * and snapshot ids but not the names of any of them. This call | |
3760 | * is made later to fill in those names. It has to be done after | |
3761 | * rbd_dev_snaps_update() has completed because some of the | |
3762 | * information (in particular, snapshot name) is not available | |
3763 | * until then. | |
3764 | */ | |
3765 | static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) | |
3766 | { | |
3767 | struct ceph_osd_client *osdc; | |
3768 | const char *name; | |
3769 | void *reply_buf = NULL; | |
3770 | int ret; | |
3771 | ||
3772 | if (rbd_dev->spec->pool_name) | |
3773 | return 0; /* Already have the names */ | |
3774 | ||
3775 | /* Look up the pool name */ | |
3776 | ||
3777 | osdc = &rbd_dev->rbd_client->client->osdc; | |
3778 | name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); | |
935dc89f AE |
3779 | if (!name) { |
3780 | rbd_warn(rbd_dev, "there is no pool with id %llu", | |
3781 | rbd_dev->spec->pool_id); /* Really a BUG() */ | |
3782 | return -EIO; | |
3783 | } | |
9e15b77d AE |
3784 | |
3785 | rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); | |
3786 | if (!rbd_dev->spec->pool_name) | |
3787 | return -ENOMEM; | |
3788 | ||
3789 | /* Fetch the image name; tolerate failure here */ | |
3790 | ||
3791 | name = rbd_dev_image_name(rbd_dev); | |
69e7a02f | 3792 | if (name) |
4157976b | 3793 | rbd_dev->spec->image_name = (char *)name; |
69e7a02f | 3794 | else |
06ecc6cb | 3795 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d AE |
3796 | |
3797 | /* Look up the snapshot name. */ | |
3798 | ||
3799 | name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); | |
3800 | if (!name) { | |
935dc89f AE |
3801 | rbd_warn(rbd_dev, "no snapshot with id %llu", |
3802 | rbd_dev->spec->snap_id); /* Really a BUG() */ | |
9e15b77d AE |
3803 | ret = -EIO; |
3804 | goto out_err; | |
3805 | } | |
3806 | rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); | |
3807 | if(!rbd_dev->spec->snap_name) | |
3808 | goto out_err; | |
3809 | ||
3810 | return 0; | |
3811 | out_err: | |
3812 | kfree(reply_buf); | |
3813 | kfree(rbd_dev->spec->pool_name); | |
3814 | rbd_dev->spec->pool_name = NULL; | |
3815 | ||
3816 | return ret; | |
3817 | } | |
3818 | ||
6e14b1a6 | 3819 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
3820 | { |
3821 | size_t size; | |
3822 | int ret; | |
3823 | void *reply_buf; | |
3824 | void *p; | |
3825 | void *end; | |
3826 | u64 seq; | |
3827 | u32 snap_count; | |
3828 | struct ceph_snap_context *snapc; | |
3829 | u32 i; | |
3830 | ||
3831 | /* | |
3832 | * We'll need room for the seq value (maximum snapshot id), | |
3833 | * snapshot count, and array of that many snapshot ids. | |
3834 | * For now we have a fixed upper limit on the number we're | |
3835 | * prepared to receive. | |
3836 | */ | |
3837 | size = sizeof (__le64) + sizeof (__le32) + | |
3838 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3839 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3840 | if (!reply_buf) | |
3841 | return -ENOMEM; | |
3842 | ||
36be9a76 | 3843 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3844 | "rbd", "get_snapcontext", NULL, 0, |
07b2391f | 3845 | reply_buf, size, ver); |
36be9a76 | 3846 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3847 | if (ret < 0) |
3848 | goto out; | |
3849 | ||
35d489f9 | 3850 | p = reply_buf; |
57385b51 AE |
3851 | end = reply_buf + ret; |
3852 | ret = -ERANGE; | |
35d489f9 AE |
3853 | ceph_decode_64_safe(&p, end, seq, out); |
3854 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3855 | ||
3856 | /* | |
3857 | * Make sure the reported number of snapshot ids wouldn't go | |
3858 | * beyond the end of our buffer. But before checking that, | |
3859 | * make sure the computed size of the snapshot context we | |
3860 | * allocate is representable in a size_t. | |
3861 | */ | |
3862 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3863 | / sizeof (u64)) { | |
3864 | ret = -EINVAL; | |
3865 | goto out; | |
3866 | } | |
3867 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3868 | goto out; | |
3869 | ||
3870 | size = sizeof (struct ceph_snap_context) + | |
3871 | snap_count * sizeof (snapc->snaps[0]); | |
3872 | snapc = kmalloc(size, GFP_KERNEL); | |
3873 | if (!snapc) { | |
3874 | ret = -ENOMEM; | |
3875 | goto out; | |
3876 | } | |
57385b51 | 3877 | ret = 0; |
35d489f9 AE |
3878 | |
3879 | atomic_set(&snapc->nref, 1); | |
3880 | snapc->seq = seq; | |
3881 | snapc->num_snaps = snap_count; | |
3882 | for (i = 0; i < snap_count; i++) | |
3883 | snapc->snaps[i] = ceph_decode_64(&p); | |
3884 | ||
3885 | rbd_dev->header.snapc = snapc; | |
3886 | ||
3887 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 3888 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
3889 | out: |
3890 | kfree(reply_buf); | |
3891 | ||
57385b51 | 3892 | return ret; |
35d489f9 AE |
3893 | } |
3894 | ||
b8b1e2db AE |
3895 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
3896 | { | |
3897 | size_t size; | |
3898 | void *reply_buf; | |
3899 | __le64 snap_id; | |
3900 | int ret; | |
3901 | void *p; | |
3902 | void *end; | |
b8b1e2db AE |
3903 | char *snap_name; |
3904 | ||
3905 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3906 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3907 | if (!reply_buf) | |
3908 | return ERR_PTR(-ENOMEM); | |
3909 | ||
3910 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
36be9a76 | 3911 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 3912 | "rbd", "get_snapshot_name", |
4157976b | 3913 | &snap_id, sizeof (snap_id), |
07b2391f | 3914 | reply_buf, size, NULL); |
36be9a76 | 3915 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b8b1e2db AE |
3916 | if (ret < 0) |
3917 | goto out; | |
3918 | ||
3919 | p = reply_buf; | |
4157976b | 3920 | end = reply_buf + size; |
e5c35534 | 3921 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
b8b1e2db AE |
3922 | if (IS_ERR(snap_name)) { |
3923 | ret = PTR_ERR(snap_name); | |
3924 | goto out; | |
3925 | } else { | |
3926 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
57385b51 | 3927 | (unsigned long long)le64_to_cpu(snap_id), snap_name); |
b8b1e2db AE |
3928 | } |
3929 | kfree(reply_buf); | |
3930 | ||
3931 | return snap_name; | |
3932 | out: | |
3933 | kfree(reply_buf); | |
3934 | ||
3935 | return ERR_PTR(ret); | |
3936 | } | |
3937 | ||
3938 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
3939 | u64 *snap_size, u64 *snap_features) | |
3940 | { | |
e0b49868 | 3941 | u64 snap_id; |
b8b1e2db AE |
3942 | u8 order; |
3943 | int ret; | |
3944 | ||
3945 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
3946 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
3947 | if (ret) | |
3948 | return ERR_PTR(ret); | |
3949 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
3950 | if (ret) | |
3951 | return ERR_PTR(ret); | |
3952 | ||
3953 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
3954 | } | |
3955 | ||
3956 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
3957 | u64 *snap_size, u64 *snap_features) | |
3958 | { | |
3959 | if (rbd_dev->image_format == 1) | |
3960 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
3961 | snap_size, snap_features); | |
3962 | if (rbd_dev->image_format == 2) | |
3963 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
3964 | snap_size, snap_features); | |
3965 | return ERR_PTR(-EINVAL); | |
3966 | } | |
3967 | ||
117973fb AE |
3968 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
3969 | { | |
3970 | int ret; | |
3971 | __u8 obj_order; | |
3972 | ||
3973 | down_write(&rbd_dev->header_rwsem); | |
3974 | ||
3975 | /* Grab old order first, to see if it changes */ | |
3976 | ||
3977 | obj_order = rbd_dev->header.obj_order, | |
3978 | ret = rbd_dev_v2_image_size(rbd_dev); | |
3979 | if (ret) | |
3980 | goto out; | |
3981 | if (rbd_dev->header.obj_order != obj_order) { | |
3982 | ret = -EIO; | |
3983 | goto out; | |
3984 | } | |
3985 | rbd_update_mapping_size(rbd_dev); | |
3986 | ||
3987 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); | |
3988 | dout("rbd_dev_v2_snap_context returned %d\n", ret); | |
3989 | if (ret) | |
3990 | goto out; | |
3991 | ret = rbd_dev_snaps_update(rbd_dev); | |
3992 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
3993 | if (ret) | |
3994 | goto out; | |
117973fb AE |
3995 | out: |
3996 | up_write(&rbd_dev->header_rwsem); | |
3997 | ||
3998 | return ret; | |
3999 | } | |
4000 | ||
dfc5606d | 4001 | /* |
35938150 AE |
4002 | * Scan the rbd device's current snapshot list and compare it to the |
4003 | * newly-received snapshot context. Remove any existing snapshots | |
4004 | * not present in the new snapshot context. Add a new snapshot for | |
4005 | * any snaphots in the snapshot context not in the current list. | |
4006 | * And verify there are no changes to snapshots we already know | |
4007 | * about. | |
4008 | * | |
4009 | * Assumes the snapshots in the snapshot context are sorted by | |
4010 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
4011 | * are also maintained in that order.) | |
522a0cc0 AE |
4012 | * |
4013 | * Note that any error occurs while updating the snapshot list | |
4014 | * aborts the update, and the entire list is cleared. The snapshot | |
4015 | * list becomes inconsistent at that point anyway, so it might as | |
4016 | * well be empty. | |
dfc5606d | 4017 | */ |
304f6808 | 4018 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 4019 | { |
35938150 AE |
4020 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
4021 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
4022 | struct list_head *head = &rbd_dev->snaps; |
4023 | struct list_head *links = head->next; | |
4024 | u32 index = 0; | |
522a0cc0 | 4025 | int ret = 0; |
dfc5606d | 4026 | |
522a0cc0 | 4027 | dout("%s: snap count is %u\n", __func__, (unsigned int)snap_count); |
35938150 AE |
4028 | while (index < snap_count || links != head) { |
4029 | u64 snap_id; | |
4030 | struct rbd_snap *snap; | |
cd892126 AE |
4031 | char *snap_name; |
4032 | u64 snap_size = 0; | |
4033 | u64 snap_features = 0; | |
dfc5606d | 4034 | |
35938150 AE |
4035 | snap_id = index < snap_count ? snapc->snaps[index] |
4036 | : CEPH_NOSNAP; | |
4037 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
4038 | : NULL; | |
aafb230e | 4039 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 4040 | |
35938150 AE |
4041 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
4042 | struct list_head *next = links->next; | |
dfc5606d | 4043 | |
6d292906 AE |
4044 | /* |
4045 | * A previously-existing snapshot is not in | |
4046 | * the new snap context. | |
4047 | * | |
522a0cc0 AE |
4048 | * If the now-missing snapshot is the one |
4049 | * the image represents, clear its existence | |
4050 | * flag so we can avoid sending any more | |
4051 | * requests to it. | |
6d292906 | 4052 | */ |
0d7dbfce | 4053 | if (rbd_dev->spec->snap_id == snap->id) |
6d292906 | 4054 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
3e83b65b | 4055 | dout("removing %ssnap id %llu\n", |
0d7dbfce AE |
4056 | rbd_dev->spec->snap_id == snap->id ? |
4057 | "mapped " : "", | |
522a0cc0 | 4058 | (unsigned long long)snap->id); |
3e83b65b | 4059 | rbd_remove_snap_dev(snap); |
35938150 AE |
4060 | |
4061 | /* Done with this list entry; advance */ | |
4062 | ||
4063 | links = next; | |
dfc5606d YS |
4064 | continue; |
4065 | } | |
35938150 | 4066 | |
b8b1e2db AE |
4067 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
4068 | &snap_size, &snap_features); | |
522a0cc0 AE |
4069 | if (IS_ERR(snap_name)) { |
4070 | ret = PTR_ERR(snap_name); | |
4071 | dout("failed to get snap info, error %d\n", ret); | |
4072 | goto out_err; | |
4073 | } | |
cd892126 | 4074 | |
522a0cc0 AE |
4075 | dout("entry %u: snap_id = %llu\n", (unsigned int)snap_count, |
4076 | (unsigned long long)snap_id); | |
35938150 AE |
4077 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
4078 | struct rbd_snap *new_snap; | |
4079 | ||
4080 | /* We haven't seen this snapshot before */ | |
4081 | ||
c8d18425 | 4082 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 4083 | snap_id, snap_size, snap_features); |
9fcbb800 | 4084 | if (IS_ERR(new_snap)) { |
522a0cc0 AE |
4085 | ret = PTR_ERR(new_snap); |
4086 | dout(" failed to add dev, error %d\n", ret); | |
4087 | goto out_err; | |
9fcbb800 | 4088 | } |
35938150 AE |
4089 | |
4090 | /* New goes before existing, or at end of list */ | |
4091 | ||
9fcbb800 | 4092 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
4093 | if (snap) |
4094 | list_add_tail(&new_snap->node, &snap->node); | |
4095 | else | |
523f3258 | 4096 | list_add_tail(&new_snap->node, head); |
35938150 AE |
4097 | } else { |
4098 | /* Already have this one */ | |
4099 | ||
9fcbb800 AE |
4100 | dout(" already present\n"); |
4101 | ||
cd892126 | 4102 | rbd_assert(snap->size == snap_size); |
aafb230e | 4103 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 4104 | rbd_assert(snap->features == snap_features); |
35938150 AE |
4105 | |
4106 | /* Done with this list entry; advance */ | |
4107 | ||
4108 | links = links->next; | |
dfc5606d | 4109 | } |
35938150 AE |
4110 | |
4111 | /* Advance to the next entry in the snapshot context */ | |
4112 | ||
4113 | index++; | |
dfc5606d | 4114 | } |
9fcbb800 | 4115 | dout("%s: done\n", __func__); |
dfc5606d YS |
4116 | |
4117 | return 0; | |
522a0cc0 AE |
4118 | out_err: |
4119 | rbd_remove_all_snaps(rbd_dev); | |
4120 | ||
4121 | return ret; | |
dfc5606d YS |
4122 | } |
4123 | ||
dfc5606d YS |
4124 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4125 | { | |
dfc5606d | 4126 | struct device *dev; |
cd789ab9 | 4127 | int ret; |
dfc5606d YS |
4128 | |
4129 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4130 | |
cd789ab9 | 4131 | dev = &rbd_dev->dev; |
dfc5606d YS |
4132 | dev->bus = &rbd_bus_type; |
4133 | dev->type = &rbd_device_type; | |
4134 | dev->parent = &rbd_root_dev; | |
4135 | dev->release = rbd_dev_release; | |
de71a297 | 4136 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4137 | ret = device_register(dev); |
dfc5606d | 4138 | |
dfc5606d | 4139 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4140 | |
dfc5606d | 4141 | return ret; |
602adf40 YS |
4142 | } |
4143 | ||
dfc5606d YS |
4144 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4145 | { | |
4146 | device_unregister(&rbd_dev->dev); | |
4147 | } | |
4148 | ||
e2839308 | 4149 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4150 | |
4151 | /* | |
499afd5b AE |
4152 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4153 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4154 | */ |
e2839308 | 4155 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4156 | { |
e2839308 | 4157 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4158 | |
4159 | spin_lock(&rbd_dev_list_lock); | |
4160 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4161 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4162 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4163 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4164 | } |
b7f23c36 | 4165 | |
1ddbe94e | 4166 | /* |
499afd5b AE |
4167 | * Remove an rbd_dev from the global list, and record that its |
4168 | * identifier is no longer in use. | |
1ddbe94e | 4169 | */ |
e2839308 | 4170 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4171 | { |
d184f6bf | 4172 | struct list_head *tmp; |
de71a297 | 4173 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4174 | int max_id; |
4175 | ||
aafb230e | 4176 | rbd_assert(rbd_id > 0); |
499afd5b | 4177 | |
e2839308 AE |
4178 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4179 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4180 | spin_lock(&rbd_dev_list_lock); |
4181 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4182 | |
4183 | /* | |
4184 | * If the id being "put" is not the current maximum, there | |
4185 | * is nothing special we need to do. | |
4186 | */ | |
e2839308 | 4187 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4188 | spin_unlock(&rbd_dev_list_lock); |
4189 | return; | |
4190 | } | |
4191 | ||
4192 | /* | |
4193 | * We need to update the current maximum id. Search the | |
4194 | * list to find out what it is. We're more likely to find | |
4195 | * the maximum at the end, so search the list backward. | |
4196 | */ | |
4197 | max_id = 0; | |
4198 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4199 | struct rbd_device *rbd_dev; | |
4200 | ||
4201 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4202 | if (rbd_dev->dev_id > max_id) |
4203 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4204 | } |
499afd5b | 4205 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4206 | |
1ddbe94e | 4207 | /* |
e2839308 | 4208 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4209 | * which case it now accurately reflects the new maximum. |
4210 | * Be careful not to overwrite the maximum value in that | |
4211 | * case. | |
1ddbe94e | 4212 | */ |
e2839308 AE |
4213 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4214 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4215 | } |
4216 | ||
e28fff26 AE |
4217 | /* |
4218 | * Skips over white space at *buf, and updates *buf to point to the | |
4219 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4220 | * the token (string of non-white space characters) found. Note |
4221 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4222 | */ |
4223 | static inline size_t next_token(const char **buf) | |
4224 | { | |
4225 | /* | |
4226 | * These are the characters that produce nonzero for | |
4227 | * isspace() in the "C" and "POSIX" locales. | |
4228 | */ | |
4229 | const char *spaces = " \f\n\r\t\v"; | |
4230 | ||
4231 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4232 | ||
4233 | return strcspn(*buf, spaces); /* Return token length */ | |
4234 | } | |
4235 | ||
4236 | /* | |
4237 | * Finds the next token in *buf, and if the provided token buffer is | |
4238 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4239 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4240 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4241 | * |
4242 | * Returns the length of the token found (not including the '\0'). | |
4243 | * Return value will be 0 if no token is found, and it will be >= | |
4244 | * token_size if the token would not fit. | |
4245 | * | |
593a9e7b | 4246 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4247 | * found token. Note that this occurs even if the token buffer is |
4248 | * too small to hold it. | |
4249 | */ | |
4250 | static inline size_t copy_token(const char **buf, | |
4251 | char *token, | |
4252 | size_t token_size) | |
4253 | { | |
4254 | size_t len; | |
4255 | ||
4256 | len = next_token(buf); | |
4257 | if (len < token_size) { | |
4258 | memcpy(token, *buf, len); | |
4259 | *(token + len) = '\0'; | |
4260 | } | |
4261 | *buf += len; | |
4262 | ||
4263 | return len; | |
4264 | } | |
4265 | ||
ea3352f4 AE |
4266 | /* |
4267 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4268 | * enough to hold a copy of it, and copies the token into the new | |
4269 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4270 | * that a duplicate buffer is created even for a zero-length token. | |
4271 | * | |
4272 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4273 | * pointer if memory for the duplicate was not available. If | |
4274 | * the lenp argument is a non-null pointer, the length of the token | |
4275 | * (not including the '\0') is returned in *lenp. | |
4276 | * | |
4277 | * If successful, the *buf pointer will be updated to point beyond | |
4278 | * the end of the found token. | |
4279 | * | |
4280 | * Note: uses GFP_KERNEL for allocation. | |
4281 | */ | |
4282 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4283 | { | |
4284 | char *dup; | |
4285 | size_t len; | |
4286 | ||
4287 | len = next_token(buf); | |
4caf35f9 | 4288 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4289 | if (!dup) |
4290 | return NULL; | |
ea3352f4 AE |
4291 | *(dup + len) = '\0'; |
4292 | *buf += len; | |
4293 | ||
4294 | if (lenp) | |
4295 | *lenp = len; | |
4296 | ||
4297 | return dup; | |
4298 | } | |
4299 | ||
a725f65e | 4300 | /* |
859c31df AE |
4301 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4302 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4303 | * and the data written is passed here via a NUL-terminated buffer. | |
4304 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4305 | * |
859c31df AE |
4306 | * The information extracted from these options is recorded in |
4307 | * the other parameters which return dynamically-allocated | |
4308 | * structures: | |
4309 | * ceph_opts | |
4310 | * The address of a pointer that will refer to a ceph options | |
4311 | * structure. Caller must release the returned pointer using | |
4312 | * ceph_destroy_options() when it is no longer needed. | |
4313 | * rbd_opts | |
4314 | * Address of an rbd options pointer. Fully initialized by | |
4315 | * this function; caller must release with kfree(). | |
4316 | * spec | |
4317 | * Address of an rbd image specification pointer. Fully | |
4318 | * initialized by this function based on parsed options. | |
4319 | * Caller must release with rbd_spec_put(). | |
4320 | * | |
4321 | * The options passed take this form: | |
4322 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4323 | * where: | |
4324 | * <mon_addrs> | |
4325 | * A comma-separated list of one or more monitor addresses. | |
4326 | * A monitor address is an ip address, optionally followed | |
4327 | * by a port number (separated by a colon). | |
4328 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4329 | * <options> | |
4330 | * A comma-separated list of ceph and/or rbd options. | |
4331 | * <pool_name> | |
4332 | * The name of the rados pool containing the rbd image. | |
4333 | * <image_name> | |
4334 | * The name of the image in that pool to map. | |
4335 | * <snap_id> | |
4336 | * An optional snapshot id. If provided, the mapping will | |
4337 | * present data from the image at the time that snapshot was | |
4338 | * created. The image head is used if no snapshot id is | |
4339 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4340 | */ |
859c31df | 4341 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4342 | struct ceph_options **ceph_opts, |
859c31df AE |
4343 | struct rbd_options **opts, |
4344 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4345 | { |
d22f76e7 | 4346 | size_t len; |
859c31df | 4347 | char *options; |
0ddebc0c AE |
4348 | const char *mon_addrs; |
4349 | size_t mon_addrs_size; | |
859c31df | 4350 | struct rbd_spec *spec = NULL; |
4e9afeba | 4351 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4352 | struct ceph_options *copts; |
dc79b113 | 4353 | int ret; |
e28fff26 AE |
4354 | |
4355 | /* The first four tokens are required */ | |
4356 | ||
7ef3214a | 4357 | len = next_token(&buf); |
4fb5d671 AE |
4358 | if (!len) { |
4359 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4360 | return -EINVAL; | |
4361 | } | |
0ddebc0c | 4362 | mon_addrs = buf; |
f28e565a | 4363 | mon_addrs_size = len + 1; |
7ef3214a | 4364 | buf += len; |
a725f65e | 4365 | |
dc79b113 | 4366 | ret = -EINVAL; |
f28e565a AE |
4367 | options = dup_token(&buf, NULL); |
4368 | if (!options) | |
dc79b113 | 4369 | return -ENOMEM; |
4fb5d671 AE |
4370 | if (!*options) { |
4371 | rbd_warn(NULL, "no options provided"); | |
4372 | goto out_err; | |
4373 | } | |
e28fff26 | 4374 | |
859c31df AE |
4375 | spec = rbd_spec_alloc(); |
4376 | if (!spec) | |
f28e565a | 4377 | goto out_mem; |
859c31df AE |
4378 | |
4379 | spec->pool_name = dup_token(&buf, NULL); | |
4380 | if (!spec->pool_name) | |
4381 | goto out_mem; | |
4fb5d671 AE |
4382 | if (!*spec->pool_name) { |
4383 | rbd_warn(NULL, "no pool name provided"); | |
4384 | goto out_err; | |
4385 | } | |
e28fff26 | 4386 | |
69e7a02f | 4387 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4388 | if (!spec->image_name) |
f28e565a | 4389 | goto out_mem; |
4fb5d671 AE |
4390 | if (!*spec->image_name) { |
4391 | rbd_warn(NULL, "no image name provided"); | |
4392 | goto out_err; | |
4393 | } | |
d4b125e9 | 4394 | |
f28e565a AE |
4395 | /* |
4396 | * Snapshot name is optional; default is to use "-" | |
4397 | * (indicating the head/no snapshot). | |
4398 | */ | |
3feeb894 | 4399 | len = next_token(&buf); |
820a5f3e | 4400 | if (!len) { |
3feeb894 AE |
4401 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4402 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4403 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4404 | ret = -ENAMETOOLONG; |
f28e565a | 4405 | goto out_err; |
849b4260 | 4406 | } |
4caf35f9 | 4407 | spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
859c31df | 4408 | if (!spec->snap_name) |
f28e565a | 4409 | goto out_mem; |
859c31df | 4410 | *(spec->snap_name + len) = '\0'; |
e5c35534 | 4411 | |
0ddebc0c | 4412 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4413 | |
4e9afeba AE |
4414 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4415 | if (!rbd_opts) | |
4416 | goto out_mem; | |
4417 | ||
4418 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4419 | |
859c31df | 4420 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4421 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4422 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4423 | if (IS_ERR(copts)) { |
4424 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4425 | goto out_err; |
4426 | } | |
859c31df AE |
4427 | kfree(options); |
4428 | ||
4429 | *ceph_opts = copts; | |
4e9afeba | 4430 | *opts = rbd_opts; |
859c31df | 4431 | *rbd_spec = spec; |
0ddebc0c | 4432 | |
dc79b113 | 4433 | return 0; |
f28e565a | 4434 | out_mem: |
dc79b113 | 4435 | ret = -ENOMEM; |
d22f76e7 | 4436 | out_err: |
859c31df AE |
4437 | kfree(rbd_opts); |
4438 | rbd_spec_put(spec); | |
f28e565a | 4439 | kfree(options); |
d22f76e7 | 4440 | |
dc79b113 | 4441 | return ret; |
a725f65e AE |
4442 | } |
4443 | ||
589d30e0 AE |
4444 | /* |
4445 | * An rbd format 2 image has a unique identifier, distinct from the | |
4446 | * name given to it by the user. Internally, that identifier is | |
4447 | * what's used to specify the names of objects related to the image. | |
4448 | * | |
4449 | * A special "rbd id" object is used to map an rbd image name to its | |
4450 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4451 | * with the supplied name. | |
4452 | * | |
4453 | * This function will record the given rbd_dev's image_id field if | |
4454 | * it can be determined, and in that case will return 0. If any | |
4455 | * errors occur a negative errno will be returned and the rbd_dev's | |
4456 | * image_id field will be unchanged (and should be NULL). | |
4457 | */ | |
4458 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4459 | { | |
4460 | int ret; | |
4461 | size_t size; | |
4462 | char *object_name; | |
4463 | void *response; | |
4464 | void *p; | |
4465 | ||
2f82ee54 AE |
4466 | /* If we already have it we don't need to look it up */ |
4467 | ||
4468 | if (rbd_dev->spec->image_id) | |
4469 | return 0; | |
4470 | ||
2c0d0a10 AE |
4471 | /* |
4472 | * When probing a parent image, the image id is already | |
4473 | * known (and the image name likely is not). There's no | |
4474 | * need to fetch the image id again in this case. | |
4475 | */ | |
4476 | if (rbd_dev->spec->image_id) | |
4477 | return 0; | |
4478 | ||
589d30e0 AE |
4479 | /* |
4480 | * First, see if the format 2 image id file exists, and if | |
4481 | * so, get the image's persistent id from it. | |
4482 | */ | |
69e7a02f | 4483 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4484 | object_name = kmalloc(size, GFP_NOIO); |
4485 | if (!object_name) | |
4486 | return -ENOMEM; | |
0d7dbfce | 4487 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4488 | dout("rbd id object name is %s\n", object_name); |
4489 | ||
4490 | /* Response will be an encoded string, which includes a length */ | |
4491 | ||
4492 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4493 | response = kzalloc(size, GFP_NOIO); | |
4494 | if (!response) { | |
4495 | ret = -ENOMEM; | |
4496 | goto out; | |
4497 | } | |
4498 | ||
36be9a76 | 4499 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4500 | "rbd", "get_id", NULL, 0, |
07b2391f | 4501 | response, RBD_IMAGE_ID_LEN_MAX, NULL); |
36be9a76 | 4502 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
589d30e0 AE |
4503 | if (ret < 0) |
4504 | goto out; | |
4505 | ||
4506 | p = response; | |
0d7dbfce | 4507 | rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, |
57385b51 | 4508 | p + ret, |
979ed480 | 4509 | NULL, GFP_NOIO); |
57385b51 AE |
4510 | ret = 0; |
4511 | ||
0d7dbfce AE |
4512 | if (IS_ERR(rbd_dev->spec->image_id)) { |
4513 | ret = PTR_ERR(rbd_dev->spec->image_id); | |
4514 | rbd_dev->spec->image_id = NULL; | |
589d30e0 | 4515 | } else { |
0d7dbfce | 4516 | dout("image_id is %s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4517 | } |
4518 | out: | |
4519 | kfree(response); | |
4520 | kfree(object_name); | |
4521 | ||
4522 | return ret; | |
4523 | } | |
4524 | ||
a30b71b9 AE |
4525 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4526 | { | |
4527 | int ret; | |
4528 | size_t size; | |
4529 | ||
4530 | /* Version 1 images have no id; empty string is used */ | |
4531 | ||
0d7dbfce AE |
4532 | rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); |
4533 | if (!rbd_dev->spec->image_id) | |
a30b71b9 | 4534 | return -ENOMEM; |
a30b71b9 AE |
4535 | |
4536 | /* Record the header object name for this rbd image. */ | |
4537 | ||
69e7a02f | 4538 | size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); |
a30b71b9 AE |
4539 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
4540 | if (!rbd_dev->header_name) { | |
4541 | ret = -ENOMEM; | |
4542 | goto out_err; | |
4543 | } | |
0d7dbfce AE |
4544 | sprintf(rbd_dev->header_name, "%s%s", |
4545 | rbd_dev->spec->image_name, RBD_SUFFIX); | |
a30b71b9 AE |
4546 | |
4547 | /* Populate rbd image metadata */ | |
4548 | ||
4549 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4550 | if (ret < 0) | |
4551 | goto out_err; | |
86b00e0d AE |
4552 | |
4553 | /* Version 1 images have no parent (no layering) */ | |
4554 | ||
4555 | rbd_dev->parent_spec = NULL; | |
4556 | rbd_dev->parent_overlap = 0; | |
4557 | ||
a30b71b9 AE |
4558 | rbd_dev->image_format = 1; |
4559 | ||
4560 | dout("discovered version 1 image, header name is %s\n", | |
4561 | rbd_dev->header_name); | |
4562 | ||
4563 | return 0; | |
4564 | ||
4565 | out_err: | |
4566 | kfree(rbd_dev->header_name); | |
4567 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4568 | kfree(rbd_dev->spec->image_id); |
4569 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4570 | |
4571 | return ret; | |
4572 | } | |
4573 | ||
4574 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4575 | { | |
4576 | size_t size; | |
9d475de5 | 4577 | int ret; |
6e14b1a6 | 4578 | u64 ver = 0; |
a30b71b9 AE |
4579 | |
4580 | /* | |
4581 | * Image id was filled in by the caller. Record the header | |
4582 | * object name for this rbd image. | |
4583 | */ | |
979ed480 | 4584 | size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); |
a30b71b9 AE |
4585 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
4586 | if (!rbd_dev->header_name) | |
4587 | return -ENOMEM; | |
4588 | sprintf(rbd_dev->header_name, "%s%s", | |
0d7dbfce | 4589 | RBD_HEADER_PREFIX, rbd_dev->spec->image_id); |
9d475de5 AE |
4590 | |
4591 | /* Get the size and object order for the image */ | |
9d475de5 | 4592 | ret = rbd_dev_v2_image_size(rbd_dev); |
57385b51 | 4593 | if (ret) |
1e130199 AE |
4594 | goto out_err; |
4595 | ||
4596 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4597 | ||
4598 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
57385b51 | 4599 | if (ret) |
b1b5402a AE |
4600 | goto out_err; |
4601 | ||
d889140c | 4602 | /* Get the and check features for the image */ |
b1b5402a AE |
4603 | |
4604 | ret = rbd_dev_v2_features(rbd_dev); | |
57385b51 | 4605 | if (ret) |
9d475de5 | 4606 | goto out_err; |
35d489f9 | 4607 | |
86b00e0d AE |
4608 | /* If the image supports layering, get the parent info */ |
4609 | ||
4610 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4611 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
57385b51 | 4612 | if (ret) |
86b00e0d | 4613 | goto out_err; |
770eba6e AE |
4614 | rbd_warn(rbd_dev, "WARNING: kernel support for " |
4615 | "layered rbd images is EXPERIMENTAL!"); | |
86b00e0d AE |
4616 | } |
4617 | ||
cc070d59 AE |
4618 | /* If the image supports fancy striping, get its parameters */ |
4619 | ||
4620 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4621 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4622 | if (ret < 0) | |
4623 | goto out_err; | |
4624 | } | |
4625 | ||
6e14b1a6 AE |
4626 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4627 | ||
4628 | rbd_dev->header.crypt_type = 0; | |
4629 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4630 | |
6e14b1a6 AE |
4631 | /* Get the snapshot context, plus the header version */ |
4632 | ||
4633 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
4634 | if (ret) |
4635 | goto out_err; | |
6e14b1a6 AE |
4636 | rbd_dev->header.obj_version = ver; |
4637 | ||
a30b71b9 AE |
4638 | rbd_dev->image_format = 2; |
4639 | ||
4640 | dout("discovered version 2 image, header name is %s\n", | |
4641 | rbd_dev->header_name); | |
4642 | ||
35152979 | 4643 | return 0; |
9d475de5 | 4644 | out_err: |
86b00e0d AE |
4645 | rbd_dev->parent_overlap = 0; |
4646 | rbd_spec_put(rbd_dev->parent_spec); | |
4647 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4648 | kfree(rbd_dev->header_name); |
4649 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4650 | kfree(rbd_dev->header.object_prefix); |
4651 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4652 | |
4653 | return ret; | |
a30b71b9 AE |
4654 | } |
4655 | ||
83a06263 AE |
4656 | static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) |
4657 | { | |
2f82ee54 AE |
4658 | struct rbd_device *parent = NULL; |
4659 | struct rbd_spec *parent_spec = NULL; | |
4660 | struct rbd_client *rbdc = NULL; | |
83a06263 AE |
4661 | int ret; |
4662 | ||
4663 | /* no need to lock here, as rbd_dev is not registered yet */ | |
4664 | ret = rbd_dev_snaps_update(rbd_dev); | |
4665 | if (ret) | |
4666 | return ret; | |
4667 | ||
9e15b77d AE |
4668 | ret = rbd_dev_probe_update_spec(rbd_dev); |
4669 | if (ret) | |
4670 | goto err_out_snaps; | |
4671 | ||
83a06263 AE |
4672 | ret = rbd_dev_set_mapping(rbd_dev); |
4673 | if (ret) | |
4674 | goto err_out_snaps; | |
4675 | ||
4676 | /* generate unique id: find highest unique id, add one */ | |
4677 | rbd_dev_id_get(rbd_dev); | |
4678 | ||
4679 | /* Fill in the device name, now that we have its id. */ | |
4680 | BUILD_BUG_ON(DEV_NAME_LEN | |
4681 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4682 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4683 | ||
4684 | /* Get our block major device number. */ | |
4685 | ||
4686 | ret = register_blkdev(0, rbd_dev->name); | |
4687 | if (ret < 0) | |
4688 | goto err_out_id; | |
4689 | rbd_dev->major = ret; | |
4690 | ||
4691 | /* Set up the blkdev mapping. */ | |
4692 | ||
4693 | ret = rbd_init_disk(rbd_dev); | |
4694 | if (ret) | |
4695 | goto err_out_blkdev; | |
4696 | ||
4697 | ret = rbd_bus_add_dev(rbd_dev); | |
4698 | if (ret) | |
4699 | goto err_out_disk; | |
4700 | ||
4701 | /* | |
4702 | * At this point cleanup in the event of an error is the job | |
4703 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
4704 | */ | |
2f82ee54 AE |
4705 | /* Probe the parent if there is one */ |
4706 | ||
4707 | if (rbd_dev->parent_spec) { | |
4708 | /* | |
4709 | * We need to pass a reference to the client and the | |
4710 | * parent spec when creating the parent rbd_dev. | |
4711 | * Images related by parent/child relationships | |
4712 | * always share both. | |
4713 | */ | |
4714 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4715 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4716 | ||
4717 | parent = rbd_dev_create(rbdc, parent_spec); | |
4718 | if (!parent) { | |
4719 | ret = -ENOMEM; | |
4720 | goto err_out_spec; | |
4721 | } | |
4722 | rbdc = NULL; /* parent now owns reference */ | |
4723 | parent_spec = NULL; /* parent now owns reference */ | |
4724 | ret = rbd_dev_probe(parent); | |
4725 | if (ret < 0) | |
4726 | goto err_out_parent; | |
4727 | rbd_dev->parent = parent; | |
4728 | } | |
4729 | ||
9969ebc5 | 4730 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
83a06263 AE |
4731 | if (ret) |
4732 | goto err_out_bus; | |
4733 | ||
4734 | /* Everything's ready. Announce the disk to the world. */ | |
4735 | ||
4736 | add_disk(rbd_dev->disk); | |
4737 | ||
4738 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4739 | (unsigned long long) rbd_dev->mapping.size); | |
4740 | ||
4741 | return ret; | |
2f82ee54 AE |
4742 | |
4743 | err_out_parent: | |
4744 | rbd_dev_destroy(parent); | |
4745 | err_out_spec: | |
4746 | rbd_spec_put(parent_spec); | |
4747 | rbd_put_client(rbdc); | |
83a06263 AE |
4748 | err_out_bus: |
4749 | /* this will also clean up rest of rbd_dev stuff */ | |
4750 | ||
4751 | rbd_bus_del_dev(rbd_dev); | |
4752 | ||
4753 | return ret; | |
4754 | err_out_disk: | |
4755 | rbd_free_disk(rbd_dev); | |
4756 | err_out_blkdev: | |
4757 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4758 | err_out_id: | |
4759 | rbd_dev_id_put(rbd_dev); | |
4760 | err_out_snaps: | |
4761 | rbd_remove_all_snaps(rbd_dev); | |
4762 | ||
4763 | return ret; | |
4764 | } | |
4765 | ||
a30b71b9 AE |
4766 | /* |
4767 | * Probe for the existence of the header object for the given rbd | |
4768 | * device. For format 2 images this includes determining the image | |
4769 | * id. | |
4770 | */ | |
4771 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
4772 | { | |
4773 | int ret; | |
4774 | ||
4775 | /* | |
4776 | * Get the id from the image id object. If it's not a | |
4777 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4778 | * it's a format 1 image. | |
4779 | */ | |
4780 | ret = rbd_dev_image_id(rbd_dev); | |
4781 | if (ret) | |
4782 | ret = rbd_dev_v1_probe(rbd_dev); | |
4783 | else | |
4784 | ret = rbd_dev_v2_probe(rbd_dev); | |
83a06263 | 4785 | if (ret) { |
a30b71b9 AE |
4786 | dout("probe failed, returning %d\n", ret); |
4787 | ||
83a06263 AE |
4788 | return ret; |
4789 | } | |
4790 | ||
4791 | ret = rbd_dev_probe_finish(rbd_dev); | |
4792 | if (ret) | |
4793 | rbd_header_free(&rbd_dev->header); | |
4794 | ||
a30b71b9 AE |
4795 | return ret; |
4796 | } | |
4797 | ||
59c2be1e YS |
4798 | static ssize_t rbd_add(struct bus_type *bus, |
4799 | const char *buf, | |
4800 | size_t count) | |
602adf40 | 4801 | { |
cb8627c7 | 4802 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4803 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4804 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4805 | struct rbd_spec *spec = NULL; |
9d3997fd | 4806 | struct rbd_client *rbdc; |
27cc2594 AE |
4807 | struct ceph_osd_client *osdc; |
4808 | int rc = -ENOMEM; | |
602adf40 YS |
4809 | |
4810 | if (!try_module_get(THIS_MODULE)) | |
4811 | return -ENODEV; | |
4812 | ||
602adf40 | 4813 | /* parse add command */ |
859c31df | 4814 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4815 | if (rc < 0) |
bd4ba655 | 4816 | goto err_out_module; |
78cea76e | 4817 | |
9d3997fd AE |
4818 | rbdc = rbd_get_client(ceph_opts); |
4819 | if (IS_ERR(rbdc)) { | |
4820 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4821 | goto err_out_args; |
9d3997fd | 4822 | } |
c53d5893 | 4823 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4824 | |
602adf40 | 4825 | /* pick the pool */ |
9d3997fd | 4826 | osdc = &rbdc->client->osdc; |
859c31df | 4827 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4828 | if (rc < 0) |
4829 | goto err_out_client; | |
859c31df AE |
4830 | spec->pool_id = (u64) rc; |
4831 | ||
0903e875 AE |
4832 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4833 | ||
4834 | if (WARN_ON(spec->pool_id > (u64) U32_MAX)) { | |
4835 | rc = -EIO; | |
4836 | goto err_out_client; | |
4837 | } | |
4838 | ||
c53d5893 | 4839 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4840 | if (!rbd_dev) |
4841 | goto err_out_client; | |
c53d5893 AE |
4842 | rbdc = NULL; /* rbd_dev now owns this */ |
4843 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4844 | |
bd4ba655 | 4845 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4846 | kfree(rbd_opts); |
4847 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4848 | |
a30b71b9 AE |
4849 | rc = rbd_dev_probe(rbd_dev); |
4850 | if (rc < 0) | |
c53d5893 | 4851 | goto err_out_rbd_dev; |
05fd6f6f | 4852 | |
602adf40 | 4853 | return count; |
c53d5893 AE |
4854 | err_out_rbd_dev: |
4855 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4856 | err_out_client: |
9d3997fd | 4857 | rbd_put_client(rbdc); |
0ddebc0c | 4858 | err_out_args: |
78cea76e AE |
4859 | if (ceph_opts) |
4860 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4861 | kfree(rbd_opts); |
859c31df | 4862 | rbd_spec_put(spec); |
bd4ba655 AE |
4863 | err_out_module: |
4864 | module_put(THIS_MODULE); | |
27cc2594 | 4865 | |
602adf40 | 4866 | dout("Error adding device %s\n", buf); |
27cc2594 AE |
4867 | |
4868 | return (ssize_t) rc; | |
602adf40 YS |
4869 | } |
4870 | ||
de71a297 | 4871 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4872 | { |
4873 | struct list_head *tmp; | |
4874 | struct rbd_device *rbd_dev; | |
4875 | ||
e124a82f | 4876 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4877 | list_for_each(tmp, &rbd_dev_list) { |
4878 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4879 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4880 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4881 | return rbd_dev; |
e124a82f | 4882 | } |
602adf40 | 4883 | } |
e124a82f | 4884 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4885 | return NULL; |
4886 | } | |
4887 | ||
dfc5606d | 4888 | static void rbd_dev_release(struct device *dev) |
602adf40 | 4889 | { |
593a9e7b | 4890 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4891 | |
59c2be1e | 4892 | if (rbd_dev->watch_event) |
9969ebc5 | 4893 | rbd_dev_header_watch_sync(rbd_dev, 0); |
602adf40 YS |
4894 | |
4895 | /* clean up and free blkdev */ | |
4896 | rbd_free_disk(rbd_dev); | |
4897 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 4898 | |
2ac4e75d AE |
4899 | /* release allocated disk header fields */ |
4900 | rbd_header_free(&rbd_dev->header); | |
4901 | ||
32eec68d | 4902 | /* done with the id, and with the rbd_dev */ |
e2839308 | 4903 | rbd_dev_id_put(rbd_dev); |
c53d5893 AE |
4904 | rbd_assert(rbd_dev->rbd_client != NULL); |
4905 | rbd_dev_destroy(rbd_dev); | |
602adf40 YS |
4906 | |
4907 | /* release module ref */ | |
4908 | module_put(THIS_MODULE); | |
602adf40 YS |
4909 | } |
4910 | ||
2f82ee54 AE |
4911 | static void __rbd_remove(struct rbd_device *rbd_dev) |
4912 | { | |
4913 | rbd_remove_all_snaps(rbd_dev); | |
4914 | rbd_bus_del_dev(rbd_dev); | |
4915 | } | |
4916 | ||
dfc5606d YS |
4917 | static ssize_t rbd_remove(struct bus_type *bus, |
4918 | const char *buf, | |
4919 | size_t count) | |
602adf40 YS |
4920 | { |
4921 | struct rbd_device *rbd_dev = NULL; | |
4922 | int target_id, rc; | |
4923 | unsigned long ul; | |
4924 | int ret = count; | |
4925 | ||
4926 | rc = strict_strtoul(buf, 10, &ul); | |
4927 | if (rc) | |
4928 | return rc; | |
4929 | ||
4930 | /* convert to int; abort if we lost anything in the conversion */ | |
4931 | target_id = (int) ul; | |
4932 | if (target_id != ul) | |
4933 | return -EINVAL; | |
4934 | ||
4935 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
4936 | ||
4937 | rbd_dev = __rbd_get_dev(target_id); | |
4938 | if (!rbd_dev) { | |
4939 | ret = -ENOENT; | |
4940 | goto done; | |
42382b70 AE |
4941 | } |
4942 | ||
a14ea269 | 4943 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 4944 | if (rbd_dev->open_count) |
42382b70 | 4945 | ret = -EBUSY; |
b82d167b AE |
4946 | else |
4947 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 4948 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 4949 | if (ret < 0) |
42382b70 | 4950 | goto done; |
602adf40 | 4951 | |
2f82ee54 AE |
4952 | while (rbd_dev->parent_spec) { |
4953 | struct rbd_device *first = rbd_dev; | |
4954 | struct rbd_device *second = first->parent; | |
4955 | struct rbd_device *third; | |
4956 | ||
4957 | /* | |
4958 | * Follow to the parent with no grandparent and | |
4959 | * remove it. | |
4960 | */ | |
4961 | while (second && (third = second->parent)) { | |
4962 | first = second; | |
4963 | second = third; | |
4964 | } | |
4965 | __rbd_remove(second); | |
4966 | rbd_spec_put(first->parent_spec); | |
4967 | first->parent_spec = NULL; | |
4968 | first->parent_overlap = 0; | |
4969 | first->parent = NULL; | |
4970 | } | |
4971 | __rbd_remove(rbd_dev); | |
602adf40 YS |
4972 | |
4973 | done: | |
4974 | mutex_unlock(&ctl_mutex); | |
aafb230e | 4975 | |
602adf40 YS |
4976 | return ret; |
4977 | } | |
4978 | ||
602adf40 YS |
4979 | /* |
4980 | * create control files in sysfs | |
dfc5606d | 4981 | * /sys/bus/rbd/... |
602adf40 YS |
4982 | */ |
4983 | static int rbd_sysfs_init(void) | |
4984 | { | |
dfc5606d | 4985 | int ret; |
602adf40 | 4986 | |
fed4c143 | 4987 | ret = device_register(&rbd_root_dev); |
21079786 | 4988 | if (ret < 0) |
dfc5606d | 4989 | return ret; |
602adf40 | 4990 | |
fed4c143 AE |
4991 | ret = bus_register(&rbd_bus_type); |
4992 | if (ret < 0) | |
4993 | device_unregister(&rbd_root_dev); | |
602adf40 | 4994 | |
602adf40 YS |
4995 | return ret; |
4996 | } | |
4997 | ||
4998 | static void rbd_sysfs_cleanup(void) | |
4999 | { | |
dfc5606d | 5000 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5001 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5002 | } |
5003 | ||
cc344fa1 | 5004 | static int __init rbd_init(void) |
602adf40 YS |
5005 | { |
5006 | int rc; | |
5007 | ||
1e32d34c AE |
5008 | if (!libceph_compatible(NULL)) { |
5009 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
5010 | ||
5011 | return -EINVAL; | |
5012 | } | |
602adf40 YS |
5013 | rc = rbd_sysfs_init(); |
5014 | if (rc) | |
5015 | return rc; | |
f0f8cef5 | 5016 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
5017 | return 0; |
5018 | } | |
5019 | ||
cc344fa1 | 5020 | static void __exit rbd_exit(void) |
602adf40 YS |
5021 | { |
5022 | rbd_sysfs_cleanup(); | |
5023 | } | |
5024 | ||
5025 | module_init(rbd_init); | |
5026 | module_exit(rbd_exit); | |
5027 | ||
5028 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
5029 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
5030 | MODULE_DESCRIPTION("rados block device"); | |
5031 | ||
5032 | /* following authorship retained from original osdblk.c */ | |
5033 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5034 | ||
5035 | MODULE_LICENSE("GPL"); |