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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
602adf40 YS |
36 | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/blkdev.h> | |
42 | ||
43 | #include "rbd_types.h" | |
44 | ||
aafb230e AE |
45 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
46 | ||
593a9e7b AE |
47 | /* |
48 | * The basic unit of block I/O is a sector. It is interpreted in a | |
49 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
50 | * universally 512 bytes. These symbols are just slightly more | |
51 | * meaningful than the bare numbers they represent. | |
52 | */ | |
53 | #define SECTOR_SHIFT 9 | |
54 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
55 | ||
f0f8cef5 AE |
56 | #define RBD_DRV_NAME "rbd" |
57 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
58 | |
59 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
60 | ||
d4b125e9 AE |
61 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
62 | #define RBD_MAX_SNAP_NAME_LEN \ | |
63 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
64 | ||
35d489f9 | 65 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
66 | |
67 | #define RBD_SNAP_HEAD_NAME "-" | |
68 | ||
9682fc6d AE |
69 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
70 | ||
9e15b77d AE |
71 | /* This allows a single page to hold an image name sent by OSD */ |
72 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 73 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 74 | |
1e130199 | 75 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 76 | |
d889140c AE |
77 | /* Feature bits */ |
78 | ||
5cbf6f12 AE |
79 | #define RBD_FEATURE_LAYERING (1<<0) |
80 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
81 | #define RBD_FEATURES_ALL \ | |
82 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
83 | |
84 | /* Features supported by this (client software) implementation. */ | |
85 | ||
770eba6e | 86 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 87 | |
81a89793 AE |
88 | /* |
89 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
90 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
91 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
92 | * enough to hold all possible device names. | |
93 | */ | |
602adf40 | 94 | #define DEV_NAME_LEN 32 |
81a89793 | 95 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
96 | |
97 | /* | |
98 | * block device image metadata (in-memory version) | |
99 | */ | |
100 | struct rbd_image_header { | |
f84344f3 | 101 | /* These four fields never change for a given rbd image */ |
849b4260 | 102 | char *object_prefix; |
34b13184 | 103 | u64 features; |
602adf40 YS |
104 | __u8 obj_order; |
105 | __u8 crypt_type; | |
106 | __u8 comp_type; | |
602adf40 | 107 | |
f84344f3 AE |
108 | /* The remaining fields need to be updated occasionally */ |
109 | u64 image_size; | |
110 | struct ceph_snap_context *snapc; | |
602adf40 YS |
111 | char *snap_names; |
112 | u64 *snap_sizes; | |
59c2be1e | 113 | |
500d0c0f AE |
114 | u64 stripe_unit; |
115 | u64 stripe_count; | |
59c2be1e YS |
116 | }; |
117 | ||
0d7dbfce AE |
118 | /* |
119 | * An rbd image specification. | |
120 | * | |
121 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
122 | * identify an image. Each rbd_dev structure includes a pointer to |
123 | * an rbd_spec structure that encapsulates this identity. | |
124 | * | |
125 | * Each of the id's in an rbd_spec has an associated name. For a | |
126 | * user-mapped image, the names are supplied and the id's associated | |
127 | * with them are looked up. For a layered image, a parent image is | |
128 | * defined by the tuple, and the names are looked up. | |
129 | * | |
130 | * An rbd_dev structure contains a parent_spec pointer which is | |
131 | * non-null if the image it represents is a child in a layered | |
132 | * image. This pointer will refer to the rbd_spec structure used | |
133 | * by the parent rbd_dev for its own identity (i.e., the structure | |
134 | * is shared between the parent and child). | |
135 | * | |
136 | * Since these structures are populated once, during the discovery | |
137 | * phase of image construction, they are effectively immutable so | |
138 | * we make no effort to synchronize access to them. | |
139 | * | |
140 | * Note that code herein does not assume the image name is known (it | |
141 | * could be a null pointer). | |
0d7dbfce AE |
142 | */ |
143 | struct rbd_spec { | |
144 | u64 pool_id; | |
ecb4dc22 | 145 | const char *pool_name; |
0d7dbfce | 146 | |
ecb4dc22 AE |
147 | const char *image_id; |
148 | const char *image_name; | |
0d7dbfce AE |
149 | |
150 | u64 snap_id; | |
ecb4dc22 | 151 | const char *snap_name; |
0d7dbfce AE |
152 | |
153 | struct kref kref; | |
154 | }; | |
155 | ||
602adf40 | 156 | /* |
f0f8cef5 | 157 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
158 | */ |
159 | struct rbd_client { | |
160 | struct ceph_client *client; | |
161 | struct kref kref; | |
162 | struct list_head node; | |
163 | }; | |
164 | ||
bf0d5f50 AE |
165 | struct rbd_img_request; |
166 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
167 | ||
168 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
169 | ||
170 | struct rbd_obj_request; | |
171 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
172 | ||
9969ebc5 AE |
173 | enum obj_request_type { |
174 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
175 | }; | |
bf0d5f50 | 176 | |
926f9b3f AE |
177 | enum obj_req_flags { |
178 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 179 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
180 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
181 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
182 | }; |
183 | ||
bf0d5f50 AE |
184 | struct rbd_obj_request { |
185 | const char *object_name; | |
186 | u64 offset; /* object start byte */ | |
187 | u64 length; /* bytes from offset */ | |
926f9b3f | 188 | unsigned long flags; |
bf0d5f50 | 189 | |
c5b5ef6c AE |
190 | /* |
191 | * An object request associated with an image will have its | |
192 | * img_data flag set; a standalone object request will not. | |
193 | * | |
194 | * A standalone object request will have which == BAD_WHICH | |
195 | * and a null obj_request pointer. | |
196 | * | |
197 | * An object request initiated in support of a layered image | |
198 | * object (to check for its existence before a write) will | |
199 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
200 | * | |
201 | * Finally, an object request for rbd image data will have | |
202 | * which != BAD_WHICH, and will have a non-null img_request | |
203 | * pointer. The value of which will be in the range | |
204 | * 0..(img_request->obj_request_count-1). | |
205 | */ | |
206 | union { | |
207 | struct rbd_obj_request *obj_request; /* STAT op */ | |
208 | struct { | |
209 | struct rbd_img_request *img_request; | |
210 | u64 img_offset; | |
211 | /* links for img_request->obj_requests list */ | |
212 | struct list_head links; | |
213 | }; | |
214 | }; | |
bf0d5f50 AE |
215 | u32 which; /* posn image request list */ |
216 | ||
217 | enum obj_request_type type; | |
788e2df3 AE |
218 | union { |
219 | struct bio *bio_list; | |
220 | struct { | |
221 | struct page **pages; | |
222 | u32 page_count; | |
223 | }; | |
224 | }; | |
0eefd470 | 225 | struct page **copyup_pages; |
bf0d5f50 AE |
226 | |
227 | struct ceph_osd_request *osd_req; | |
228 | ||
229 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 230 | int result; |
bf0d5f50 AE |
231 | |
232 | rbd_obj_callback_t callback; | |
788e2df3 | 233 | struct completion completion; |
bf0d5f50 AE |
234 | |
235 | struct kref kref; | |
236 | }; | |
237 | ||
0c425248 | 238 | enum img_req_flags { |
9849e986 AE |
239 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
240 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 241 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
242 | }; |
243 | ||
bf0d5f50 | 244 | struct rbd_img_request { |
bf0d5f50 AE |
245 | struct rbd_device *rbd_dev; |
246 | u64 offset; /* starting image byte offset */ | |
247 | u64 length; /* byte count from offset */ | |
0c425248 | 248 | unsigned long flags; |
bf0d5f50 | 249 | union { |
9849e986 | 250 | u64 snap_id; /* for reads */ |
bf0d5f50 | 251 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
252 | }; |
253 | union { | |
254 | struct request *rq; /* block request */ | |
255 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 256 | }; |
3d7efd18 | 257 | struct page **copyup_pages; |
bf0d5f50 AE |
258 | spinlock_t completion_lock;/* protects next_completion */ |
259 | u32 next_completion; | |
260 | rbd_img_callback_t callback; | |
55f27e09 | 261 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 262 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
263 | |
264 | u32 obj_request_count; | |
265 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
266 | ||
267 | struct kref kref; | |
268 | }; | |
269 | ||
270 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 271 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 272 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 273 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 274 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 275 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 276 | |
f84344f3 | 277 | struct rbd_mapping { |
99c1f08f | 278 | u64 size; |
34b13184 | 279 | u64 features; |
f84344f3 AE |
280 | bool read_only; |
281 | }; | |
282 | ||
602adf40 YS |
283 | /* |
284 | * a single device | |
285 | */ | |
286 | struct rbd_device { | |
de71a297 | 287 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
288 | |
289 | int major; /* blkdev assigned major */ | |
290 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 291 | |
a30b71b9 | 292 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
293 | struct rbd_client *rbd_client; |
294 | ||
295 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
296 | ||
b82d167b | 297 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
298 | |
299 | struct rbd_image_header header; | |
b82d167b | 300 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 301 | struct rbd_spec *spec; |
602adf40 | 302 | |
0d7dbfce | 303 | char *header_name; |
971f839a | 304 | |
0903e875 AE |
305 | struct ceph_file_layout layout; |
306 | ||
59c2be1e | 307 | struct ceph_osd_event *watch_event; |
975241af | 308 | struct rbd_obj_request *watch_request; |
59c2be1e | 309 | |
86b00e0d AE |
310 | struct rbd_spec *parent_spec; |
311 | u64 parent_overlap; | |
2f82ee54 | 312 | struct rbd_device *parent; |
86b00e0d | 313 | |
c666601a JD |
314 | /* protects updating the header */ |
315 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
316 | |
317 | struct rbd_mapping mapping; | |
602adf40 YS |
318 | |
319 | struct list_head node; | |
dfc5606d | 320 | |
dfc5606d YS |
321 | /* sysfs related */ |
322 | struct device dev; | |
b82d167b | 323 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
324 | }; |
325 | ||
b82d167b AE |
326 | /* |
327 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
328 | * rbd_dev->lock is used to protect access. | |
329 | * | |
330 | * Currently, only the "removing" flag (which is coupled with the | |
331 | * "open_count" field) requires atomic access. | |
332 | */ | |
6d292906 AE |
333 | enum rbd_dev_flags { |
334 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 335 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
336 | }; |
337 | ||
602adf40 | 338 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 339 | |
602adf40 | 340 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
341 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
342 | ||
432b8587 AE |
343 | static LIST_HEAD(rbd_client_list); /* clients */ |
344 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 345 | |
3d7efd18 AE |
346 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
347 | ||
200a6a8b | 348 | static void rbd_dev_device_release(struct device *dev); |
dfc5606d | 349 | |
f0f8cef5 AE |
350 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
351 | size_t count); | |
352 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
353 | size_t count); | |
71f293e2 | 354 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev); |
f0f8cef5 AE |
355 | |
356 | static struct bus_attribute rbd_bus_attrs[] = { | |
357 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
358 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
359 | __ATTR_NULL | |
360 | }; | |
361 | ||
362 | static struct bus_type rbd_bus_type = { | |
363 | .name = "rbd", | |
364 | .bus_attrs = rbd_bus_attrs, | |
365 | }; | |
366 | ||
367 | static void rbd_root_dev_release(struct device *dev) | |
368 | { | |
369 | } | |
370 | ||
371 | static struct device rbd_root_dev = { | |
372 | .init_name = "rbd", | |
373 | .release = rbd_root_dev_release, | |
374 | }; | |
375 | ||
06ecc6cb AE |
376 | static __printf(2, 3) |
377 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
378 | { | |
379 | struct va_format vaf; | |
380 | va_list args; | |
381 | ||
382 | va_start(args, fmt); | |
383 | vaf.fmt = fmt; | |
384 | vaf.va = &args; | |
385 | ||
386 | if (!rbd_dev) | |
387 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
388 | else if (rbd_dev->disk) | |
389 | printk(KERN_WARNING "%s: %s: %pV\n", | |
390 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
391 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
392 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
393 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
394 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
395 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
396 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
397 | else /* punt */ | |
398 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
399 | RBD_DRV_NAME, rbd_dev, &vaf); | |
400 | va_end(args); | |
401 | } | |
402 | ||
aafb230e AE |
403 | #ifdef RBD_DEBUG |
404 | #define rbd_assert(expr) \ | |
405 | if (unlikely(!(expr))) { \ | |
406 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
407 | "at line %d:\n\n" \ | |
408 | "\trbd_assert(%s);\n\n", \ | |
409 | __func__, __LINE__, #expr); \ | |
410 | BUG(); \ | |
411 | } | |
412 | #else /* !RBD_DEBUG */ | |
413 | # define rbd_assert(expr) ((void) 0) | |
414 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 415 | |
b454e36d | 416 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
417 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
418 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 419 | |
cc4a38bd AE |
420 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
421 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev); | |
54cac61f AE |
422 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
423 | u64 snap_id); | |
2ad3d716 AE |
424 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
425 | u8 *order, u64 *snap_size); | |
426 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
427 | u64 *snap_features); | |
428 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); | |
59c2be1e | 429 | |
602adf40 YS |
430 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
431 | { | |
f0f8cef5 | 432 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 433 | bool removing = false; |
602adf40 | 434 | |
f84344f3 | 435 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
436 | return -EROFS; |
437 | ||
a14ea269 | 438 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
439 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
440 | removing = true; | |
441 | else | |
442 | rbd_dev->open_count++; | |
a14ea269 | 443 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
444 | if (removing) |
445 | return -ENOENT; | |
446 | ||
42382b70 | 447 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 448 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 449 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 450 | mutex_unlock(&ctl_mutex); |
340c7a2b | 451 | |
602adf40 YS |
452 | return 0; |
453 | } | |
454 | ||
dfc5606d YS |
455 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
456 | { | |
457 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
458 | unsigned long open_count_before; |
459 | ||
a14ea269 | 460 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 461 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 462 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 463 | rbd_assert(open_count_before > 0); |
dfc5606d | 464 | |
42382b70 | 465 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 466 | put_device(&rbd_dev->dev); |
42382b70 | 467 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
468 | |
469 | return 0; | |
470 | } | |
471 | ||
602adf40 YS |
472 | static const struct block_device_operations rbd_bd_ops = { |
473 | .owner = THIS_MODULE, | |
474 | .open = rbd_open, | |
dfc5606d | 475 | .release = rbd_release, |
602adf40 YS |
476 | }; |
477 | ||
478 | /* | |
479 | * Initialize an rbd client instance. | |
43ae4701 | 480 | * We own *ceph_opts. |
602adf40 | 481 | */ |
f8c38929 | 482 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
483 | { |
484 | struct rbd_client *rbdc; | |
485 | int ret = -ENOMEM; | |
486 | ||
37206ee5 | 487 | dout("%s:\n", __func__); |
602adf40 YS |
488 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
489 | if (!rbdc) | |
490 | goto out_opt; | |
491 | ||
492 | kref_init(&rbdc->kref); | |
493 | INIT_LIST_HEAD(&rbdc->node); | |
494 | ||
bc534d86 AE |
495 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
496 | ||
43ae4701 | 497 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 498 | if (IS_ERR(rbdc->client)) |
bc534d86 | 499 | goto out_mutex; |
43ae4701 | 500 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
501 | |
502 | ret = ceph_open_session(rbdc->client); | |
503 | if (ret < 0) | |
504 | goto out_err; | |
505 | ||
432b8587 | 506 | spin_lock(&rbd_client_list_lock); |
602adf40 | 507 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 508 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 509 | |
bc534d86 | 510 | mutex_unlock(&ctl_mutex); |
37206ee5 | 511 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 512 | |
602adf40 YS |
513 | return rbdc; |
514 | ||
515 | out_err: | |
516 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
517 | out_mutex: |
518 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
519 | kfree(rbdc); |
520 | out_opt: | |
43ae4701 AE |
521 | if (ceph_opts) |
522 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
523 | dout("%s: error %d\n", __func__, ret); |
524 | ||
28f259b7 | 525 | return ERR_PTR(ret); |
602adf40 YS |
526 | } |
527 | ||
2f82ee54 AE |
528 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
529 | { | |
530 | kref_get(&rbdc->kref); | |
531 | ||
532 | return rbdc; | |
533 | } | |
534 | ||
602adf40 | 535 | /* |
1f7ba331 AE |
536 | * Find a ceph client with specific addr and configuration. If |
537 | * found, bump its reference count. | |
602adf40 | 538 | */ |
1f7ba331 | 539 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
540 | { |
541 | struct rbd_client *client_node; | |
1f7ba331 | 542 | bool found = false; |
602adf40 | 543 | |
43ae4701 | 544 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
545 | return NULL; |
546 | ||
1f7ba331 AE |
547 | spin_lock(&rbd_client_list_lock); |
548 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
549 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
550 | __rbd_get_client(client_node); |
551 | ||
1f7ba331 AE |
552 | found = true; |
553 | break; | |
554 | } | |
555 | } | |
556 | spin_unlock(&rbd_client_list_lock); | |
557 | ||
558 | return found ? client_node : NULL; | |
602adf40 YS |
559 | } |
560 | ||
59c2be1e YS |
561 | /* |
562 | * mount options | |
563 | */ | |
564 | enum { | |
59c2be1e YS |
565 | Opt_last_int, |
566 | /* int args above */ | |
567 | Opt_last_string, | |
568 | /* string args above */ | |
cc0538b6 AE |
569 | Opt_read_only, |
570 | Opt_read_write, | |
571 | /* Boolean args above */ | |
572 | Opt_last_bool, | |
59c2be1e YS |
573 | }; |
574 | ||
43ae4701 | 575 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
576 | /* int args above */ |
577 | /* string args above */ | |
be466c1c | 578 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
579 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
580 | {Opt_read_write, "read_write"}, | |
581 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
582 | /* Boolean args above */ | |
59c2be1e YS |
583 | {-1, NULL} |
584 | }; | |
585 | ||
98571b5a AE |
586 | struct rbd_options { |
587 | bool read_only; | |
588 | }; | |
589 | ||
590 | #define RBD_READ_ONLY_DEFAULT false | |
591 | ||
59c2be1e YS |
592 | static int parse_rbd_opts_token(char *c, void *private) |
593 | { | |
43ae4701 | 594 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
595 | substring_t argstr[MAX_OPT_ARGS]; |
596 | int token, intval, ret; | |
597 | ||
43ae4701 | 598 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
599 | if (token < 0) |
600 | return -EINVAL; | |
601 | ||
602 | if (token < Opt_last_int) { | |
603 | ret = match_int(&argstr[0], &intval); | |
604 | if (ret < 0) { | |
605 | pr_err("bad mount option arg (not int) " | |
606 | "at '%s'\n", c); | |
607 | return ret; | |
608 | } | |
609 | dout("got int token %d val %d\n", token, intval); | |
610 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
611 | dout("got string token %d val %s\n", token, | |
612 | argstr[0].from); | |
cc0538b6 AE |
613 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
614 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
615 | } else { |
616 | dout("got token %d\n", token); | |
617 | } | |
618 | ||
619 | switch (token) { | |
cc0538b6 AE |
620 | case Opt_read_only: |
621 | rbd_opts->read_only = true; | |
622 | break; | |
623 | case Opt_read_write: | |
624 | rbd_opts->read_only = false; | |
625 | break; | |
59c2be1e | 626 | default: |
aafb230e AE |
627 | rbd_assert(false); |
628 | break; | |
59c2be1e YS |
629 | } |
630 | return 0; | |
631 | } | |
632 | ||
602adf40 YS |
633 | /* |
634 | * Get a ceph client with specific addr and configuration, if one does | |
635 | * not exist create it. | |
636 | */ | |
9d3997fd | 637 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 638 | { |
f8c38929 | 639 | struct rbd_client *rbdc; |
59c2be1e | 640 | |
1f7ba331 | 641 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 642 | if (rbdc) /* using an existing client */ |
43ae4701 | 643 | ceph_destroy_options(ceph_opts); |
9d3997fd | 644 | else |
f8c38929 | 645 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 646 | |
9d3997fd | 647 | return rbdc; |
602adf40 YS |
648 | } |
649 | ||
650 | /* | |
651 | * Destroy ceph client | |
d23a4b3f | 652 | * |
432b8587 | 653 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
654 | */ |
655 | static void rbd_client_release(struct kref *kref) | |
656 | { | |
657 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
658 | ||
37206ee5 | 659 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 660 | spin_lock(&rbd_client_list_lock); |
602adf40 | 661 | list_del(&rbdc->node); |
cd9d9f5d | 662 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
663 | |
664 | ceph_destroy_client(rbdc->client); | |
665 | kfree(rbdc); | |
666 | } | |
667 | ||
668 | /* | |
669 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
670 | * it. | |
671 | */ | |
9d3997fd | 672 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 673 | { |
c53d5893 AE |
674 | if (rbdc) |
675 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
676 | } |
677 | ||
a30b71b9 AE |
678 | static bool rbd_image_format_valid(u32 image_format) |
679 | { | |
680 | return image_format == 1 || image_format == 2; | |
681 | } | |
682 | ||
8e94af8e AE |
683 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
684 | { | |
103a150f AE |
685 | size_t size; |
686 | u32 snap_count; | |
687 | ||
688 | /* The header has to start with the magic rbd header text */ | |
689 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
690 | return false; | |
691 | ||
db2388b6 AE |
692 | /* The bio layer requires at least sector-sized I/O */ |
693 | ||
694 | if (ondisk->options.order < SECTOR_SHIFT) | |
695 | return false; | |
696 | ||
697 | /* If we use u64 in a few spots we may be able to loosen this */ | |
698 | ||
699 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
700 | return false; | |
701 | ||
103a150f AE |
702 | /* |
703 | * The size of a snapshot header has to fit in a size_t, and | |
704 | * that limits the number of snapshots. | |
705 | */ | |
706 | snap_count = le32_to_cpu(ondisk->snap_count); | |
707 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
708 | if (snap_count > size / sizeof (__le64)) | |
709 | return false; | |
710 | ||
711 | /* | |
712 | * Not only that, but the size of the entire the snapshot | |
713 | * header must also be representable in a size_t. | |
714 | */ | |
715 | size -= snap_count * sizeof (__le64); | |
716 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
717 | return false; | |
718 | ||
719 | return true; | |
8e94af8e AE |
720 | } |
721 | ||
602adf40 YS |
722 | /* |
723 | * Create a new header structure, translate header format from the on-disk | |
724 | * header. | |
725 | */ | |
726 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 727 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 728 | { |
ccece235 | 729 | u32 snap_count; |
58c17b0e | 730 | size_t len; |
d2bb24e5 | 731 | size_t size; |
621901d6 | 732 | u32 i; |
602adf40 | 733 | |
6a52325f AE |
734 | memset(header, 0, sizeof (*header)); |
735 | ||
103a150f AE |
736 | snap_count = le32_to_cpu(ondisk->snap_count); |
737 | ||
58c17b0e AE |
738 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
739 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 740 | if (!header->object_prefix) |
602adf40 | 741 | return -ENOMEM; |
58c17b0e AE |
742 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
743 | header->object_prefix[len] = '\0'; | |
00f1f36f | 744 | |
602adf40 | 745 | if (snap_count) { |
f785cc1d AE |
746 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
747 | ||
621901d6 AE |
748 | /* Save a copy of the snapshot names */ |
749 | ||
f785cc1d AE |
750 | if (snap_names_len > (u64) SIZE_MAX) |
751 | return -EIO; | |
752 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 753 | if (!header->snap_names) |
6a52325f | 754 | goto out_err; |
f785cc1d AE |
755 | /* |
756 | * Note that rbd_dev_v1_header_read() guarantees | |
757 | * the ondisk buffer we're working with has | |
758 | * snap_names_len bytes beyond the end of the | |
759 | * snapshot id array, this memcpy() is safe. | |
760 | */ | |
761 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
762 | snap_names_len); | |
6a52325f | 763 | |
621901d6 AE |
764 | /* Record each snapshot's size */ |
765 | ||
d2bb24e5 AE |
766 | size = snap_count * sizeof (*header->snap_sizes); |
767 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 768 | if (!header->snap_sizes) |
6a52325f | 769 | goto out_err; |
621901d6 AE |
770 | for (i = 0; i < snap_count; i++) |
771 | header->snap_sizes[i] = | |
772 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 YS |
773 | } else { |
774 | header->snap_names = NULL; | |
775 | header->snap_sizes = NULL; | |
776 | } | |
849b4260 | 777 | |
34b13184 | 778 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
779 | header->obj_order = ondisk->options.order; |
780 | header->crypt_type = ondisk->options.crypt_type; | |
781 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 782 | |
621901d6 AE |
783 | /* Allocate and fill in the snapshot context */ |
784 | ||
f84344f3 | 785 | header->image_size = le64_to_cpu(ondisk->image_size); |
468521c1 | 786 | |
812164f8 | 787 | header->snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
6a52325f AE |
788 | if (!header->snapc) |
789 | goto out_err; | |
505cbb9b | 790 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
621901d6 | 791 | for (i = 0; i < snap_count; i++) |
468521c1 | 792 | header->snapc->snaps[i] = le64_to_cpu(ondisk->snaps[i].id); |
602adf40 YS |
793 | |
794 | return 0; | |
795 | ||
6a52325f | 796 | out_err: |
849b4260 | 797 | kfree(header->snap_sizes); |
ccece235 | 798 | header->snap_sizes = NULL; |
602adf40 | 799 | kfree(header->snap_names); |
ccece235 | 800 | header->snap_names = NULL; |
6a52325f AE |
801 | kfree(header->object_prefix); |
802 | header->object_prefix = NULL; | |
ccece235 | 803 | |
00f1f36f | 804 | return -ENOMEM; |
602adf40 YS |
805 | } |
806 | ||
9682fc6d AE |
807 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
808 | { | |
809 | const char *snap_name; | |
810 | ||
811 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
812 | ||
813 | /* Skip over names until we find the one we are looking for */ | |
814 | ||
815 | snap_name = rbd_dev->header.snap_names; | |
816 | while (which--) | |
817 | snap_name += strlen(snap_name) + 1; | |
818 | ||
819 | return kstrdup(snap_name, GFP_KERNEL); | |
820 | } | |
821 | ||
822 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) | |
823 | { | |
824 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
825 | u32 which; | |
826 | ||
827 | for (which = 0; which < snapc->num_snaps; which++) | |
828 | if (snapc->snaps[which] == snap_id) | |
829 | return which; | |
830 | ||
831 | return BAD_SNAP_INDEX; | |
832 | } | |
833 | ||
2ad3d716 AE |
834 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
835 | u64 snap_id) | |
9e15b77d | 836 | { |
54cac61f | 837 | u32 which; |
9e15b77d | 838 | |
54cac61f AE |
839 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
840 | if (which == BAD_SNAP_INDEX) | |
841 | return NULL; | |
842 | ||
843 | return _rbd_dev_v1_snap_name(rbd_dev, which); | |
844 | } | |
845 | ||
846 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
847 | { | |
9e15b77d AE |
848 | if (snap_id == CEPH_NOSNAP) |
849 | return RBD_SNAP_HEAD_NAME; | |
850 | ||
54cac61f AE |
851 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
852 | if (rbd_dev->image_format == 1) | |
853 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 854 | |
54cac61f | 855 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
856 | } |
857 | ||
2ad3d716 AE |
858 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
859 | u64 *snap_size) | |
602adf40 | 860 | { |
2ad3d716 AE |
861 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
862 | if (snap_id == CEPH_NOSNAP) { | |
863 | *snap_size = rbd_dev->header.image_size; | |
864 | } else if (rbd_dev->image_format == 1) { | |
865 | u32 which; | |
602adf40 | 866 | |
2ad3d716 AE |
867 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
868 | if (which == BAD_SNAP_INDEX) | |
869 | return -ENOENT; | |
e86924a8 | 870 | |
2ad3d716 AE |
871 | *snap_size = rbd_dev->header.snap_sizes[which]; |
872 | } else { | |
873 | u64 size = 0; | |
874 | int ret; | |
875 | ||
876 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
877 | if (ret) | |
878 | return ret; | |
879 | ||
880 | *snap_size = size; | |
881 | } | |
882 | return 0; | |
602adf40 YS |
883 | } |
884 | ||
2ad3d716 AE |
885 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
886 | u64 *snap_features) | |
602adf40 | 887 | { |
2ad3d716 AE |
888 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
889 | if (snap_id == CEPH_NOSNAP) { | |
890 | *snap_features = rbd_dev->header.features; | |
891 | } else if (rbd_dev->image_format == 1) { | |
892 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 893 | } else { |
2ad3d716 AE |
894 | u64 features = 0; |
895 | int ret; | |
8b0241f8 | 896 | |
2ad3d716 AE |
897 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
898 | if (ret) | |
899 | return ret; | |
900 | ||
901 | *snap_features = features; | |
902 | } | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
907 | { | |
908 | const char *snap_name = rbd_dev->spec->snap_name; | |
909 | u64 snap_id; | |
910 | u64 size = 0; | |
911 | u64 features = 0; | |
912 | int ret; | |
913 | ||
914 | if (strcmp(snap_name, RBD_SNAP_HEAD_NAME)) { | |
915 | snap_id = rbd_snap_id_by_name(rbd_dev, snap_name); | |
916 | if (snap_id == CEPH_NOSNAP) | |
8b0241f8 | 917 | return -ENOENT; |
2ad3d716 AE |
918 | } else { |
919 | snap_id = CEPH_NOSNAP; | |
602adf40 | 920 | } |
6d292906 | 921 | |
2ad3d716 AE |
922 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
923 | if (ret) | |
924 | return ret; | |
925 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
926 | if (ret) | |
927 | return ret; | |
928 | ||
929 | rbd_dev->mapping.size = size; | |
930 | rbd_dev->mapping.features = features; | |
931 | ||
932 | /* If we are mapping a snapshot it must be marked read-only */ | |
933 | ||
934 | if (snap_id != CEPH_NOSNAP) | |
935 | rbd_dev->mapping.read_only = true; | |
936 | ||
8b0241f8 | 937 | return 0; |
602adf40 YS |
938 | } |
939 | ||
d1cf5788 AE |
940 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
941 | { | |
942 | rbd_dev->mapping.size = 0; | |
943 | rbd_dev->mapping.features = 0; | |
944 | rbd_dev->mapping.read_only = true; | |
945 | } | |
946 | ||
200a6a8b AE |
947 | static void rbd_dev_clear_mapping(struct rbd_device *rbd_dev) |
948 | { | |
949 | rbd_dev->mapping.size = 0; | |
950 | rbd_dev->mapping.features = 0; | |
951 | rbd_dev->mapping.read_only = true; | |
952 | } | |
953 | ||
98571b5a | 954 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 955 | { |
65ccfe21 AE |
956 | char *name; |
957 | u64 segment; | |
958 | int ret; | |
602adf40 | 959 | |
2fd82b9e | 960 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
961 | if (!name) |
962 | return NULL; | |
963 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 964 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 965 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 966 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
967 | pr_err("error formatting segment name for #%llu (%d)\n", |
968 | segment, ret); | |
969 | kfree(name); | |
970 | name = NULL; | |
971 | } | |
602adf40 | 972 | |
65ccfe21 AE |
973 | return name; |
974 | } | |
602adf40 | 975 | |
65ccfe21 AE |
976 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
977 | { | |
978 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 979 | |
65ccfe21 AE |
980 | return offset & (segment_size - 1); |
981 | } | |
982 | ||
983 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
984 | u64 offset, u64 length) | |
985 | { | |
986 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
987 | ||
988 | offset &= segment_size - 1; | |
989 | ||
aafb230e | 990 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
991 | if (offset + length > segment_size) |
992 | length = segment_size - offset; | |
993 | ||
994 | return length; | |
602adf40 YS |
995 | } |
996 | ||
029bcbd8 JD |
997 | /* |
998 | * returns the size of an object in the image | |
999 | */ | |
1000 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1001 | { | |
1002 | return 1 << header->obj_order; | |
1003 | } | |
1004 | ||
602adf40 YS |
1005 | /* |
1006 | * bio helpers | |
1007 | */ | |
1008 | ||
1009 | static void bio_chain_put(struct bio *chain) | |
1010 | { | |
1011 | struct bio *tmp; | |
1012 | ||
1013 | while (chain) { | |
1014 | tmp = chain; | |
1015 | chain = chain->bi_next; | |
1016 | bio_put(tmp); | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * zeros a bio chain, starting at specific offset | |
1022 | */ | |
1023 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1024 | { | |
1025 | struct bio_vec *bv; | |
1026 | unsigned long flags; | |
1027 | void *buf; | |
1028 | int i; | |
1029 | int pos = 0; | |
1030 | ||
1031 | while (chain) { | |
1032 | bio_for_each_segment(bv, chain, i) { | |
1033 | if (pos + bv->bv_len > start_ofs) { | |
1034 | int remainder = max(start_ofs - pos, 0); | |
1035 | buf = bvec_kmap_irq(bv, &flags); | |
1036 | memset(buf + remainder, 0, | |
1037 | bv->bv_len - remainder); | |
85b5aaa6 | 1038 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
1039 | } |
1040 | pos += bv->bv_len; | |
1041 | } | |
1042 | ||
1043 | chain = chain->bi_next; | |
1044 | } | |
1045 | } | |
1046 | ||
b9434c5b AE |
1047 | /* |
1048 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1049 | * starting at the given byte offset from the start of the array and | |
1050 | * continuing up to the given end offset. The pages array is | |
1051 | * assumed to be big enough to hold all bytes up to the end. | |
1052 | */ | |
1053 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1054 | { | |
1055 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1056 | ||
1057 | rbd_assert(end > offset); | |
1058 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1059 | while (offset < end) { | |
1060 | size_t page_offset; | |
1061 | size_t length; | |
1062 | unsigned long flags; | |
1063 | void *kaddr; | |
1064 | ||
1065 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
1066 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
1067 | local_irq_save(flags); | |
1068 | kaddr = kmap_atomic(*page); | |
1069 | memset(kaddr + page_offset, 0, length); | |
1070 | kunmap_atomic(kaddr); | |
1071 | local_irq_restore(flags); | |
1072 | ||
1073 | offset += length; | |
1074 | page++; | |
1075 | } | |
1076 | } | |
1077 | ||
602adf40 | 1078 | /* |
f7760dad AE |
1079 | * Clone a portion of a bio, starting at the given byte offset |
1080 | * and continuing for the number of bytes indicated. | |
602adf40 | 1081 | */ |
f7760dad AE |
1082 | static struct bio *bio_clone_range(struct bio *bio_src, |
1083 | unsigned int offset, | |
1084 | unsigned int len, | |
1085 | gfp_t gfpmask) | |
602adf40 | 1086 | { |
f7760dad AE |
1087 | struct bio_vec *bv; |
1088 | unsigned int resid; | |
1089 | unsigned short idx; | |
1090 | unsigned int voff; | |
1091 | unsigned short end_idx; | |
1092 | unsigned short vcnt; | |
1093 | struct bio *bio; | |
1094 | ||
1095 | /* Handle the easy case for the caller */ | |
1096 | ||
1097 | if (!offset && len == bio_src->bi_size) | |
1098 | return bio_clone(bio_src, gfpmask); | |
1099 | ||
1100 | if (WARN_ON_ONCE(!len)) | |
1101 | return NULL; | |
1102 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1103 | return NULL; | |
1104 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1105 | return NULL; | |
1106 | ||
1107 | /* Find first affected segment... */ | |
1108 | ||
1109 | resid = offset; | |
1110 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1111 | if (resid < bv->bv_len) | |
1112 | break; | |
1113 | resid -= bv->bv_len; | |
602adf40 | 1114 | } |
f7760dad | 1115 | voff = resid; |
602adf40 | 1116 | |
f7760dad | 1117 | /* ...and the last affected segment */ |
602adf40 | 1118 | |
f7760dad AE |
1119 | resid += len; |
1120 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1121 | if (resid <= bv->bv_len) | |
1122 | break; | |
1123 | resid -= bv->bv_len; | |
1124 | } | |
1125 | vcnt = end_idx - idx + 1; | |
1126 | ||
1127 | /* Build the clone */ | |
1128 | ||
1129 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1130 | if (!bio) | |
1131 | return NULL; /* ENOMEM */ | |
602adf40 | 1132 | |
f7760dad AE |
1133 | bio->bi_bdev = bio_src->bi_bdev; |
1134 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1135 | bio->bi_rw = bio_src->bi_rw; | |
1136 | bio->bi_flags |= 1 << BIO_CLONED; | |
1137 | ||
1138 | /* | |
1139 | * Copy over our part of the bio_vec, then update the first | |
1140 | * and last (or only) entries. | |
1141 | */ | |
1142 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1143 | vcnt * sizeof (struct bio_vec)); | |
1144 | bio->bi_io_vec[0].bv_offset += voff; | |
1145 | if (vcnt > 1) { | |
1146 | bio->bi_io_vec[0].bv_len -= voff; | |
1147 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1148 | } else { | |
1149 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1150 | } |
1151 | ||
f7760dad AE |
1152 | bio->bi_vcnt = vcnt; |
1153 | bio->bi_size = len; | |
1154 | bio->bi_idx = 0; | |
1155 | ||
1156 | return bio; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Clone a portion of a bio chain, starting at the given byte offset | |
1161 | * into the first bio in the source chain and continuing for the | |
1162 | * number of bytes indicated. The result is another bio chain of | |
1163 | * exactly the given length, or a null pointer on error. | |
1164 | * | |
1165 | * The bio_src and offset parameters are both in-out. On entry they | |
1166 | * refer to the first source bio and the offset into that bio where | |
1167 | * the start of data to be cloned is located. | |
1168 | * | |
1169 | * On return, bio_src is updated to refer to the bio in the source | |
1170 | * chain that contains first un-cloned byte, and *offset will | |
1171 | * contain the offset of that byte within that bio. | |
1172 | */ | |
1173 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1174 | unsigned int *offset, | |
1175 | unsigned int len, | |
1176 | gfp_t gfpmask) | |
1177 | { | |
1178 | struct bio *bi = *bio_src; | |
1179 | unsigned int off = *offset; | |
1180 | struct bio *chain = NULL; | |
1181 | struct bio **end; | |
1182 | ||
1183 | /* Build up a chain of clone bios up to the limit */ | |
1184 | ||
1185 | if (!bi || off >= bi->bi_size || !len) | |
1186 | return NULL; /* Nothing to clone */ | |
602adf40 | 1187 | |
f7760dad AE |
1188 | end = &chain; |
1189 | while (len) { | |
1190 | unsigned int bi_size; | |
1191 | struct bio *bio; | |
1192 | ||
f5400b7a AE |
1193 | if (!bi) { |
1194 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1195 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1196 | } |
f7760dad AE |
1197 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1198 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1199 | if (!bio) | |
1200 | goto out_err; /* ENOMEM */ | |
1201 | ||
1202 | *end = bio; | |
1203 | end = &bio->bi_next; | |
602adf40 | 1204 | |
f7760dad AE |
1205 | off += bi_size; |
1206 | if (off == bi->bi_size) { | |
1207 | bi = bi->bi_next; | |
1208 | off = 0; | |
1209 | } | |
1210 | len -= bi_size; | |
1211 | } | |
1212 | *bio_src = bi; | |
1213 | *offset = off; | |
1214 | ||
1215 | return chain; | |
1216 | out_err: | |
1217 | bio_chain_put(chain); | |
602adf40 | 1218 | |
602adf40 YS |
1219 | return NULL; |
1220 | } | |
1221 | ||
926f9b3f AE |
1222 | /* |
1223 | * The default/initial value for all object request flags is 0. For | |
1224 | * each flag, once its value is set to 1 it is never reset to 0 | |
1225 | * again. | |
1226 | */ | |
57acbaa7 | 1227 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1228 | { |
57acbaa7 | 1229 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1230 | struct rbd_device *rbd_dev; |
1231 | ||
57acbaa7 AE |
1232 | rbd_dev = obj_request->img_request->rbd_dev; |
1233 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1234 | obj_request); |
1235 | } | |
1236 | } | |
1237 | ||
57acbaa7 | 1238 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1239 | { |
1240 | smp_mb(); | |
57acbaa7 | 1241 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1242 | } |
1243 | ||
57acbaa7 | 1244 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1245 | { |
57acbaa7 AE |
1246 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1247 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1248 | |
57acbaa7 AE |
1249 | if (obj_request_img_data_test(obj_request)) |
1250 | rbd_dev = obj_request->img_request->rbd_dev; | |
1251 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1252 | obj_request); |
1253 | } | |
1254 | } | |
1255 | ||
57acbaa7 | 1256 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1257 | { |
1258 | smp_mb(); | |
57acbaa7 | 1259 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1260 | } |
1261 | ||
5679c59f AE |
1262 | /* |
1263 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1264 | * flag. The latter is set based on the "exists" value provided. | |
1265 | * | |
1266 | * Note that for our purposes once an object exists it never goes | |
1267 | * away again. It's possible that the response from two existence | |
1268 | * checks are separated by the creation of the target object, and | |
1269 | * the first ("doesn't exist") response arrives *after* the second | |
1270 | * ("does exist"). In that case we ignore the second one. | |
1271 | */ | |
1272 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1273 | bool exists) | |
1274 | { | |
1275 | if (exists) | |
1276 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1277 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1278 | smp_mb(); | |
1279 | } | |
1280 | ||
1281 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1282 | { | |
1283 | smp_mb(); | |
1284 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1285 | } | |
1286 | ||
1287 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1288 | { | |
1289 | smp_mb(); | |
1290 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1291 | } | |
1292 | ||
bf0d5f50 AE |
1293 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1294 | { | |
37206ee5 AE |
1295 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1296 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1297 | kref_get(&obj_request->kref); |
1298 | } | |
1299 | ||
1300 | static void rbd_obj_request_destroy(struct kref *kref); | |
1301 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1302 | { | |
1303 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1304 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1305 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1306 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1307 | } | |
1308 | ||
1309 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1310 | { | |
37206ee5 AE |
1311 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1312 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1313 | kref_get(&img_request->kref); |
1314 | } | |
1315 | ||
1316 | static void rbd_img_request_destroy(struct kref *kref); | |
1317 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1318 | { | |
1319 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1320 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1321 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1322 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1323 | } | |
1324 | ||
1325 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1326 | struct rbd_obj_request *obj_request) | |
1327 | { | |
25dcf954 AE |
1328 | rbd_assert(obj_request->img_request == NULL); |
1329 | ||
b155e86c | 1330 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1331 | obj_request->img_request = img_request; |
25dcf954 | 1332 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1333 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1334 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1335 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1336 | img_request->obj_request_count++; |
1337 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1338 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1339 | obj_request->which); | |
bf0d5f50 AE |
1340 | } |
1341 | ||
1342 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1343 | struct rbd_obj_request *obj_request) | |
1344 | { | |
1345 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1346 | |
37206ee5 AE |
1347 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1348 | obj_request->which); | |
bf0d5f50 | 1349 | list_del(&obj_request->links); |
25dcf954 AE |
1350 | rbd_assert(img_request->obj_request_count > 0); |
1351 | img_request->obj_request_count--; | |
1352 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1353 | obj_request->which = BAD_WHICH; | |
6365d33a | 1354 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1355 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1356 | obj_request->img_request = NULL; |
25dcf954 | 1357 | obj_request->callback = NULL; |
bf0d5f50 AE |
1358 | rbd_obj_request_put(obj_request); |
1359 | } | |
1360 | ||
1361 | static bool obj_request_type_valid(enum obj_request_type type) | |
1362 | { | |
1363 | switch (type) { | |
9969ebc5 | 1364 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1365 | case OBJ_REQUEST_BIO: |
788e2df3 | 1366 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1367 | return true; |
1368 | default: | |
1369 | return false; | |
1370 | } | |
1371 | } | |
1372 | ||
bf0d5f50 AE |
1373 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1374 | struct rbd_obj_request *obj_request) | |
1375 | { | |
37206ee5 AE |
1376 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1377 | ||
bf0d5f50 AE |
1378 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1379 | } | |
1380 | ||
1381 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1382 | { | |
55f27e09 | 1383 | |
37206ee5 | 1384 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1385 | |
1386 | /* | |
1387 | * If no error occurred, compute the aggregate transfer | |
1388 | * count for the image request. We could instead use | |
1389 | * atomic64_cmpxchg() to update it as each object request | |
1390 | * completes; not clear which way is better off hand. | |
1391 | */ | |
1392 | if (!img_request->result) { | |
1393 | struct rbd_obj_request *obj_request; | |
1394 | u64 xferred = 0; | |
1395 | ||
1396 | for_each_obj_request(img_request, obj_request) | |
1397 | xferred += obj_request->xferred; | |
1398 | img_request->xferred = xferred; | |
1399 | } | |
1400 | ||
bf0d5f50 AE |
1401 | if (img_request->callback) |
1402 | img_request->callback(img_request); | |
1403 | else | |
1404 | rbd_img_request_put(img_request); | |
1405 | } | |
1406 | ||
788e2df3 AE |
1407 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1408 | ||
1409 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1410 | { | |
37206ee5 AE |
1411 | dout("%s: obj %p\n", __func__, obj_request); |
1412 | ||
788e2df3 AE |
1413 | return wait_for_completion_interruptible(&obj_request->completion); |
1414 | } | |
1415 | ||
0c425248 AE |
1416 | /* |
1417 | * The default/initial value for all image request flags is 0. Each | |
1418 | * is conditionally set to 1 at image request initialization time | |
1419 | * and currently never change thereafter. | |
1420 | */ | |
1421 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1422 | { | |
1423 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1424 | smp_mb(); | |
1425 | } | |
1426 | ||
1427 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1428 | { | |
1429 | smp_mb(); | |
1430 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1431 | } | |
1432 | ||
9849e986 AE |
1433 | static void img_request_child_set(struct rbd_img_request *img_request) |
1434 | { | |
1435 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1436 | smp_mb(); | |
1437 | } | |
1438 | ||
1439 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1440 | { | |
1441 | smp_mb(); | |
1442 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1443 | } | |
1444 | ||
d0b2e944 AE |
1445 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1446 | { | |
1447 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1448 | smp_mb(); | |
1449 | } | |
1450 | ||
1451 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1452 | { | |
1453 | smp_mb(); | |
1454 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1455 | } | |
1456 | ||
6e2a4505 AE |
1457 | static void |
1458 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1459 | { | |
b9434c5b AE |
1460 | u64 xferred = obj_request->xferred; |
1461 | u64 length = obj_request->length; | |
1462 | ||
6e2a4505 AE |
1463 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1464 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1465 | xferred, length); |
6e2a4505 AE |
1466 | /* |
1467 | * ENOENT means a hole in the image. We zero-fill the | |
1468 | * entire length of the request. A short read also implies | |
1469 | * zero-fill to the end of the request. Either way we | |
1470 | * update the xferred count to indicate the whole request | |
1471 | * was satisfied. | |
1472 | */ | |
b9434c5b | 1473 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1474 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1475 | if (obj_request->type == OBJ_REQUEST_BIO) |
1476 | zero_bio_chain(obj_request->bio_list, 0); | |
1477 | else | |
1478 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1479 | obj_request->result = 0; |
b9434c5b AE |
1480 | obj_request->xferred = length; |
1481 | } else if (xferred < length && !obj_request->result) { | |
1482 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1483 | zero_bio_chain(obj_request->bio_list, xferred); | |
1484 | else | |
1485 | zero_pages(obj_request->pages, xferred, length); | |
1486 | obj_request->xferred = length; | |
6e2a4505 AE |
1487 | } |
1488 | obj_request_done_set(obj_request); | |
1489 | } | |
1490 | ||
bf0d5f50 AE |
1491 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1492 | { | |
37206ee5 AE |
1493 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1494 | obj_request->callback); | |
bf0d5f50 AE |
1495 | if (obj_request->callback) |
1496 | obj_request->callback(obj_request); | |
788e2df3 AE |
1497 | else |
1498 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1499 | } |
1500 | ||
c47f9371 | 1501 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1502 | { |
1503 | dout("%s: obj %p\n", __func__, obj_request); | |
1504 | obj_request_done_set(obj_request); | |
1505 | } | |
1506 | ||
c47f9371 | 1507 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1508 | { |
57acbaa7 | 1509 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1510 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1511 | bool layered = false; |
1512 | ||
1513 | if (obj_request_img_data_test(obj_request)) { | |
1514 | img_request = obj_request->img_request; | |
1515 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1516 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1517 | } |
8b3e1a56 AE |
1518 | |
1519 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1520 | obj_request, img_request, obj_request->result, | |
1521 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1522 | if (layered && obj_request->result == -ENOENT && |
1523 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1524 | rbd_img_parent_read(obj_request); |
1525 | else if (img_request) | |
6e2a4505 AE |
1526 | rbd_img_obj_request_read_callback(obj_request); |
1527 | else | |
1528 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1529 | } |
1530 | ||
c47f9371 | 1531 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1532 | { |
1b83bef2 SW |
1533 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1534 | obj_request->result, obj_request->length); | |
1535 | /* | |
8b3e1a56 AE |
1536 | * There is no such thing as a successful short write. Set |
1537 | * it to our originally-requested length. | |
1b83bef2 SW |
1538 | */ |
1539 | obj_request->xferred = obj_request->length; | |
07741308 | 1540 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1541 | } |
1542 | ||
fbfab539 AE |
1543 | /* |
1544 | * For a simple stat call there's nothing to do. We'll do more if | |
1545 | * this is part of a write sequence for a layered image. | |
1546 | */ | |
c47f9371 | 1547 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1548 | { |
37206ee5 | 1549 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1550 | obj_request_done_set(obj_request); |
1551 | } | |
1552 | ||
bf0d5f50 AE |
1553 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1554 | struct ceph_msg *msg) | |
1555 | { | |
1556 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1557 | u16 opcode; |
1558 | ||
37206ee5 | 1559 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1560 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1561 | if (obj_request_img_data_test(obj_request)) { |
1562 | rbd_assert(obj_request->img_request); | |
1563 | rbd_assert(obj_request->which != BAD_WHICH); | |
1564 | } else { | |
1565 | rbd_assert(obj_request->which == BAD_WHICH); | |
1566 | } | |
bf0d5f50 | 1567 | |
1b83bef2 SW |
1568 | if (osd_req->r_result < 0) |
1569 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1570 | |
0eefd470 | 1571 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1572 | |
c47f9371 AE |
1573 | /* |
1574 | * We support a 64-bit length, but ultimately it has to be | |
1575 | * passed to blk_end_request(), which takes an unsigned int. | |
1576 | */ | |
1b83bef2 | 1577 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1578 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1579 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1580 | switch (opcode) { |
1581 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1582 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1583 | break; |
1584 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1585 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1586 | break; |
fbfab539 | 1587 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1588 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1589 | break; |
36be9a76 | 1590 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1591 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1592 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1593 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1594 | break; |
bf0d5f50 AE |
1595 | default: |
1596 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1597 | obj_request->object_name, (unsigned short) opcode); | |
1598 | break; | |
1599 | } | |
1600 | ||
07741308 | 1601 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1602 | rbd_obj_request_complete(obj_request); |
1603 | } | |
1604 | ||
9d4df01f | 1605 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1606 | { |
1607 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1608 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1609 | u64 snap_id; |
430c28c3 | 1610 | |
8c042b0d | 1611 | rbd_assert(osd_req != NULL); |
430c28c3 | 1612 | |
9d4df01f | 1613 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1614 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1615 | NULL, snap_id, NULL); |
1616 | } | |
1617 | ||
1618 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1619 | { | |
1620 | struct rbd_img_request *img_request = obj_request->img_request; | |
1621 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1622 | struct ceph_snap_context *snapc; | |
1623 | struct timespec mtime = CURRENT_TIME; | |
1624 | ||
1625 | rbd_assert(osd_req != NULL); | |
1626 | ||
1627 | snapc = img_request ? img_request->snapc : NULL; | |
1628 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1629 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1630 | } |
1631 | ||
bf0d5f50 AE |
1632 | static struct ceph_osd_request *rbd_osd_req_create( |
1633 | struct rbd_device *rbd_dev, | |
1634 | bool write_request, | |
430c28c3 | 1635 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1636 | { |
bf0d5f50 AE |
1637 | struct ceph_snap_context *snapc = NULL; |
1638 | struct ceph_osd_client *osdc; | |
1639 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1640 | |
6365d33a AE |
1641 | if (obj_request_img_data_test(obj_request)) { |
1642 | struct rbd_img_request *img_request = obj_request->img_request; | |
1643 | ||
0c425248 AE |
1644 | rbd_assert(write_request == |
1645 | img_request_write_test(img_request)); | |
1646 | if (write_request) | |
bf0d5f50 | 1647 | snapc = img_request->snapc; |
bf0d5f50 AE |
1648 | } |
1649 | ||
1650 | /* Allocate and initialize the request, for the single op */ | |
1651 | ||
1652 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1653 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1654 | if (!osd_req) | |
1655 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1656 | |
430c28c3 | 1657 | if (write_request) |
bf0d5f50 | 1658 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1659 | else |
bf0d5f50 | 1660 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1661 | |
1662 | osd_req->r_callback = rbd_osd_req_callback; | |
1663 | osd_req->r_priv = obj_request; | |
1664 | ||
1665 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1666 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1667 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1668 | ||
1669 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1670 | ||
bf0d5f50 AE |
1671 | return osd_req; |
1672 | } | |
1673 | ||
0eefd470 AE |
1674 | /* |
1675 | * Create a copyup osd request based on the information in the | |
1676 | * object request supplied. A copyup request has two osd ops, | |
1677 | * a copyup method call, and a "normal" write request. | |
1678 | */ | |
1679 | static struct ceph_osd_request * | |
1680 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1681 | { | |
1682 | struct rbd_img_request *img_request; | |
1683 | struct ceph_snap_context *snapc; | |
1684 | struct rbd_device *rbd_dev; | |
1685 | struct ceph_osd_client *osdc; | |
1686 | struct ceph_osd_request *osd_req; | |
1687 | ||
1688 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1689 | img_request = obj_request->img_request; | |
1690 | rbd_assert(img_request); | |
1691 | rbd_assert(img_request_write_test(img_request)); | |
1692 | ||
1693 | /* Allocate and initialize the request, for the two ops */ | |
1694 | ||
1695 | snapc = img_request->snapc; | |
1696 | rbd_dev = img_request->rbd_dev; | |
1697 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1698 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1699 | if (!osd_req) | |
1700 | return NULL; /* ENOMEM */ | |
1701 | ||
1702 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1703 | osd_req->r_callback = rbd_osd_req_callback; | |
1704 | osd_req->r_priv = obj_request; | |
1705 | ||
1706 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1707 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1708 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1709 | ||
1710 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1711 | ||
1712 | return osd_req; | |
1713 | } | |
1714 | ||
1715 | ||
bf0d5f50 AE |
1716 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1717 | { | |
1718 | ceph_osdc_put_request(osd_req); | |
1719 | } | |
1720 | ||
1721 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1722 | ||
1723 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1724 | u64 offset, u64 length, | |
1725 | enum obj_request_type type) | |
1726 | { | |
1727 | struct rbd_obj_request *obj_request; | |
1728 | size_t size; | |
1729 | char *name; | |
1730 | ||
1731 | rbd_assert(obj_request_type_valid(type)); | |
1732 | ||
1733 | size = strlen(object_name) + 1; | |
1734 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1735 | if (!obj_request) | |
1736 | return NULL; | |
1737 | ||
1738 | name = (char *)(obj_request + 1); | |
1739 | obj_request->object_name = memcpy(name, object_name, size); | |
1740 | obj_request->offset = offset; | |
1741 | obj_request->length = length; | |
926f9b3f | 1742 | obj_request->flags = 0; |
bf0d5f50 AE |
1743 | obj_request->which = BAD_WHICH; |
1744 | obj_request->type = type; | |
1745 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1746 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1747 | kref_init(&obj_request->kref); |
1748 | ||
37206ee5 AE |
1749 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1750 | offset, length, (int)type, obj_request); | |
1751 | ||
bf0d5f50 AE |
1752 | return obj_request; |
1753 | } | |
1754 | ||
1755 | static void rbd_obj_request_destroy(struct kref *kref) | |
1756 | { | |
1757 | struct rbd_obj_request *obj_request; | |
1758 | ||
1759 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1760 | ||
37206ee5 AE |
1761 | dout("%s: obj %p\n", __func__, obj_request); |
1762 | ||
bf0d5f50 AE |
1763 | rbd_assert(obj_request->img_request == NULL); |
1764 | rbd_assert(obj_request->which == BAD_WHICH); | |
1765 | ||
1766 | if (obj_request->osd_req) | |
1767 | rbd_osd_req_destroy(obj_request->osd_req); | |
1768 | ||
1769 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1770 | switch (obj_request->type) { | |
9969ebc5 AE |
1771 | case OBJ_REQUEST_NODATA: |
1772 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1773 | case OBJ_REQUEST_BIO: |
1774 | if (obj_request->bio_list) | |
1775 | bio_chain_put(obj_request->bio_list); | |
1776 | break; | |
788e2df3 AE |
1777 | case OBJ_REQUEST_PAGES: |
1778 | if (obj_request->pages) | |
1779 | ceph_release_page_vector(obj_request->pages, | |
1780 | obj_request->page_count); | |
1781 | break; | |
bf0d5f50 AE |
1782 | } |
1783 | ||
1784 | kfree(obj_request); | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * Caller is responsible for filling in the list of object requests | |
1789 | * that comprises the image request, and the Linux request pointer | |
1790 | * (if there is one). | |
1791 | */ | |
cc344fa1 AE |
1792 | static struct rbd_img_request *rbd_img_request_create( |
1793 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1794 | u64 offset, u64 length, |
9849e986 AE |
1795 | bool write_request, |
1796 | bool child_request) | |
bf0d5f50 AE |
1797 | { |
1798 | struct rbd_img_request *img_request; | |
bf0d5f50 AE |
1799 | |
1800 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1801 | if (!img_request) | |
1802 | return NULL; | |
1803 | ||
1804 | if (write_request) { | |
1805 | down_read(&rbd_dev->header_rwsem); | |
812164f8 | 1806 | ceph_get_snap_context(rbd_dev->header.snapc); |
bf0d5f50 | 1807 | up_read(&rbd_dev->header_rwsem); |
bf0d5f50 AE |
1808 | } |
1809 | ||
1810 | img_request->rq = NULL; | |
1811 | img_request->rbd_dev = rbd_dev; | |
1812 | img_request->offset = offset; | |
1813 | img_request->length = length; | |
0c425248 AE |
1814 | img_request->flags = 0; |
1815 | if (write_request) { | |
1816 | img_request_write_set(img_request); | |
468521c1 | 1817 | img_request->snapc = rbd_dev->header.snapc; |
0c425248 | 1818 | } else { |
bf0d5f50 | 1819 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1820 | } |
9849e986 AE |
1821 | if (child_request) |
1822 | img_request_child_set(img_request); | |
d0b2e944 AE |
1823 | if (rbd_dev->parent_spec) |
1824 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1825 | spin_lock_init(&img_request->completion_lock); |
1826 | img_request->next_completion = 0; | |
1827 | img_request->callback = NULL; | |
a5a337d4 | 1828 | img_request->result = 0; |
bf0d5f50 AE |
1829 | img_request->obj_request_count = 0; |
1830 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1831 | kref_init(&img_request->kref); | |
1832 | ||
1833 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1834 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1835 | ||
37206ee5 AE |
1836 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1837 | write_request ? "write" : "read", offset, length, | |
1838 | img_request); | |
1839 | ||
bf0d5f50 AE |
1840 | return img_request; |
1841 | } | |
1842 | ||
1843 | static void rbd_img_request_destroy(struct kref *kref) | |
1844 | { | |
1845 | struct rbd_img_request *img_request; | |
1846 | struct rbd_obj_request *obj_request; | |
1847 | struct rbd_obj_request *next_obj_request; | |
1848 | ||
1849 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1850 | ||
37206ee5 AE |
1851 | dout("%s: img %p\n", __func__, img_request); |
1852 | ||
bf0d5f50 AE |
1853 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1854 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1855 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1856 | |
0c425248 | 1857 | if (img_request_write_test(img_request)) |
812164f8 | 1858 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1859 | |
8b3e1a56 AE |
1860 | if (img_request_child_test(img_request)) |
1861 | rbd_obj_request_put(img_request->obj_request); | |
1862 | ||
bf0d5f50 AE |
1863 | kfree(img_request); |
1864 | } | |
1865 | ||
1217857f AE |
1866 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1867 | { | |
6365d33a | 1868 | struct rbd_img_request *img_request; |
1217857f AE |
1869 | unsigned int xferred; |
1870 | int result; | |
8b3e1a56 | 1871 | bool more; |
1217857f | 1872 | |
6365d33a AE |
1873 | rbd_assert(obj_request_img_data_test(obj_request)); |
1874 | img_request = obj_request->img_request; | |
1875 | ||
1217857f AE |
1876 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1877 | xferred = (unsigned int)obj_request->xferred; | |
1878 | result = obj_request->result; | |
1879 | if (result) { | |
1880 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1881 | ||
1882 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1883 | img_request_write_test(img_request) ? "write" : "read", | |
1884 | obj_request->length, obj_request->img_offset, | |
1885 | obj_request->offset); | |
1886 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1887 | result, xferred); | |
1888 | if (!img_request->result) | |
1889 | img_request->result = result; | |
1890 | } | |
1891 | ||
f1a4739f AE |
1892 | /* Image object requests don't own their page array */ |
1893 | ||
1894 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1895 | obj_request->pages = NULL; | |
1896 | obj_request->page_count = 0; | |
1897 | } | |
1898 | ||
8b3e1a56 AE |
1899 | if (img_request_child_test(img_request)) { |
1900 | rbd_assert(img_request->obj_request != NULL); | |
1901 | more = obj_request->which < img_request->obj_request_count - 1; | |
1902 | } else { | |
1903 | rbd_assert(img_request->rq != NULL); | |
1904 | more = blk_end_request(img_request->rq, result, xferred); | |
1905 | } | |
1906 | ||
1907 | return more; | |
1217857f AE |
1908 | } |
1909 | ||
2169238d AE |
1910 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1911 | { | |
1912 | struct rbd_img_request *img_request; | |
1913 | u32 which = obj_request->which; | |
1914 | bool more = true; | |
1915 | ||
6365d33a | 1916 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1917 | img_request = obj_request->img_request; |
1918 | ||
1919 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1920 | rbd_assert(img_request != NULL); | |
2169238d AE |
1921 | rbd_assert(img_request->obj_request_count > 0); |
1922 | rbd_assert(which != BAD_WHICH); | |
1923 | rbd_assert(which < img_request->obj_request_count); | |
1924 | rbd_assert(which >= img_request->next_completion); | |
1925 | ||
1926 | spin_lock_irq(&img_request->completion_lock); | |
1927 | if (which != img_request->next_completion) | |
1928 | goto out; | |
1929 | ||
1930 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1931 | rbd_assert(more); |
1932 | rbd_assert(which < img_request->obj_request_count); | |
1933 | ||
1934 | if (!obj_request_done_test(obj_request)) | |
1935 | break; | |
1217857f | 1936 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1937 | which++; |
1938 | } | |
1939 | ||
1940 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1941 | img_request->next_completion = which; | |
1942 | out: | |
1943 | spin_unlock_irq(&img_request->completion_lock); | |
1944 | ||
1945 | if (!more) | |
1946 | rbd_img_request_complete(img_request); | |
1947 | } | |
1948 | ||
f1a4739f AE |
1949 | /* |
1950 | * Split up an image request into one or more object requests, each | |
1951 | * to a different object. The "type" parameter indicates whether | |
1952 | * "data_desc" is the pointer to the head of a list of bio | |
1953 | * structures, or the base of a page array. In either case this | |
1954 | * function assumes data_desc describes memory sufficient to hold | |
1955 | * all data described by the image request. | |
1956 | */ | |
1957 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1958 | enum obj_request_type type, | |
1959 | void *data_desc) | |
bf0d5f50 AE |
1960 | { |
1961 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1962 | struct rbd_obj_request *obj_request = NULL; | |
1963 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1964 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1965 | struct bio *bio_list; |
1966 | unsigned int bio_offset = 0; | |
1967 | struct page **pages; | |
7da22d29 | 1968 | u64 img_offset; |
bf0d5f50 AE |
1969 | u64 resid; |
1970 | u16 opcode; | |
1971 | ||
f1a4739f AE |
1972 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1973 | (int)type, data_desc); | |
37206ee5 | 1974 | |
430c28c3 | 1975 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1976 | img_offset = img_request->offset; |
bf0d5f50 | 1977 | resid = img_request->length; |
4dda41d3 | 1978 | rbd_assert(resid > 0); |
f1a4739f AE |
1979 | |
1980 | if (type == OBJ_REQUEST_BIO) { | |
1981 | bio_list = data_desc; | |
1982 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1983 | } else { | |
1984 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
1985 | pages = data_desc; | |
1986 | } | |
1987 | ||
bf0d5f50 | 1988 | while (resid) { |
2fa12320 | 1989 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 1990 | const char *object_name; |
bf0d5f50 AE |
1991 | u64 offset; |
1992 | u64 length; | |
1993 | ||
7da22d29 | 1994 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
1995 | if (!object_name) |
1996 | goto out_unwind; | |
7da22d29 AE |
1997 | offset = rbd_segment_offset(rbd_dev, img_offset); |
1998 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 1999 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2000 | offset, length, type); |
bf0d5f50 AE |
2001 | kfree(object_name); /* object request has its own copy */ |
2002 | if (!obj_request) | |
2003 | goto out_unwind; | |
2004 | ||
f1a4739f AE |
2005 | if (type == OBJ_REQUEST_BIO) { |
2006 | unsigned int clone_size; | |
2007 | ||
2008 | rbd_assert(length <= (u64)UINT_MAX); | |
2009 | clone_size = (unsigned int)length; | |
2010 | obj_request->bio_list = | |
2011 | bio_chain_clone_range(&bio_list, | |
2012 | &bio_offset, | |
2013 | clone_size, | |
2014 | GFP_ATOMIC); | |
2015 | if (!obj_request->bio_list) | |
2016 | goto out_partial; | |
2017 | } else { | |
2018 | unsigned int page_count; | |
2019 | ||
2020 | obj_request->pages = pages; | |
2021 | page_count = (u32)calc_pages_for(offset, length); | |
2022 | obj_request->page_count = page_count; | |
2023 | if ((offset + length) & ~PAGE_MASK) | |
2024 | page_count--; /* more on last page */ | |
2025 | pages += page_count; | |
2026 | } | |
bf0d5f50 | 2027 | |
2fa12320 AE |
2028 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
2029 | obj_request); | |
2030 | if (!osd_req) | |
bf0d5f50 | 2031 | goto out_partial; |
2fa12320 | 2032 | obj_request->osd_req = osd_req; |
2169238d | 2033 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 2034 | |
2fa12320 AE |
2035 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
2036 | 0, 0); | |
f1a4739f AE |
2037 | if (type == OBJ_REQUEST_BIO) |
2038 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
2039 | obj_request->bio_list, length); | |
2040 | else | |
2041 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
2042 | obj_request->pages, length, | |
2043 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
2044 | |
2045 | if (write_request) | |
2046 | rbd_osd_req_format_write(obj_request); | |
2047 | else | |
2048 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 2049 | |
7da22d29 | 2050 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
2051 | rbd_img_obj_request_add(img_request, obj_request); |
2052 | ||
7da22d29 | 2053 | img_offset += length; |
bf0d5f50 AE |
2054 | resid -= length; |
2055 | } | |
2056 | ||
2057 | return 0; | |
2058 | ||
2059 | out_partial: | |
2060 | rbd_obj_request_put(obj_request); | |
2061 | out_unwind: | |
2062 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
2063 | rbd_obj_request_put(obj_request); | |
2064 | ||
2065 | return -ENOMEM; | |
2066 | } | |
2067 | ||
0eefd470 AE |
2068 | static void |
2069 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2070 | { | |
2071 | struct rbd_img_request *img_request; | |
2072 | struct rbd_device *rbd_dev; | |
2073 | u64 length; | |
2074 | u32 page_count; | |
2075 | ||
2076 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2077 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2078 | img_request = obj_request->img_request; | |
2079 | rbd_assert(img_request); | |
2080 | ||
2081 | rbd_dev = img_request->rbd_dev; | |
2082 | rbd_assert(rbd_dev); | |
2083 | length = (u64)1 << rbd_dev->header.obj_order; | |
2084 | page_count = (u32)calc_pages_for(0, length); | |
2085 | ||
2086 | rbd_assert(obj_request->copyup_pages); | |
2087 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2088 | obj_request->copyup_pages = NULL; | |
2089 | ||
2090 | /* | |
2091 | * We want the transfer count to reflect the size of the | |
2092 | * original write request. There is no such thing as a | |
2093 | * successful short write, so if the request was successful | |
2094 | * we can just set it to the originally-requested length. | |
2095 | */ | |
2096 | if (!obj_request->result) | |
2097 | obj_request->xferred = obj_request->length; | |
2098 | ||
2099 | /* Finish up with the normal image object callback */ | |
2100 | ||
2101 | rbd_img_obj_callback(obj_request); | |
2102 | } | |
2103 | ||
3d7efd18 AE |
2104 | static void |
2105 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2106 | { | |
2107 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2108 | struct ceph_osd_request *osd_req; |
2109 | struct ceph_osd_client *osdc; | |
2110 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2111 | struct page **pages; |
3d7efd18 AE |
2112 | int result; |
2113 | u64 obj_size; | |
2114 | u64 xferred; | |
2115 | ||
2116 | rbd_assert(img_request_child_test(img_request)); | |
2117 | ||
2118 | /* First get what we need from the image request */ | |
2119 | ||
2120 | pages = img_request->copyup_pages; | |
2121 | rbd_assert(pages != NULL); | |
2122 | img_request->copyup_pages = NULL; | |
2123 | ||
2124 | orig_request = img_request->obj_request; | |
2125 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2126 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2127 | result = img_request->result; |
2128 | obj_size = img_request->length; | |
2129 | xferred = img_request->xferred; | |
2130 | ||
0eefd470 AE |
2131 | rbd_dev = img_request->rbd_dev; |
2132 | rbd_assert(rbd_dev); | |
2133 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2134 | ||
3d7efd18 AE |
2135 | rbd_img_request_put(img_request); |
2136 | ||
0eefd470 AE |
2137 | if (result) |
2138 | goto out_err; | |
2139 | ||
2140 | /* Allocate the new copyup osd request for the original request */ | |
2141 | ||
2142 | result = -ENOMEM; | |
2143 | rbd_assert(!orig_request->osd_req); | |
2144 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2145 | if (!osd_req) | |
2146 | goto out_err; | |
2147 | orig_request->osd_req = osd_req; | |
2148 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2149 | |
0eefd470 | 2150 | /* Initialize the copyup op */ |
3d7efd18 | 2151 | |
0eefd470 AE |
2152 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2153 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2154 | false, false); | |
3d7efd18 | 2155 | |
0eefd470 AE |
2156 | /* Then the original write request op */ |
2157 | ||
2158 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2159 | orig_request->offset, | |
2160 | orig_request->length, 0, 0); | |
2161 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2162 | orig_request->length); | |
2163 | ||
2164 | rbd_osd_req_format_write(orig_request); | |
2165 | ||
2166 | /* All set, send it off. */ | |
2167 | ||
2168 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2169 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2170 | result = rbd_obj_request_submit(osdc, orig_request); | |
2171 | if (!result) | |
2172 | return; | |
2173 | out_err: | |
2174 | /* Record the error code and complete the request */ | |
2175 | ||
2176 | orig_request->result = result; | |
2177 | orig_request->xferred = 0; | |
2178 | obj_request_done_set(orig_request); | |
2179 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2180 | } |
2181 | ||
2182 | /* | |
2183 | * Read from the parent image the range of data that covers the | |
2184 | * entire target of the given object request. This is used for | |
2185 | * satisfying a layered image write request when the target of an | |
2186 | * object request from the image request does not exist. | |
2187 | * | |
2188 | * A page array big enough to hold the returned data is allocated | |
2189 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2190 | * When the read completes, this page array will be transferred to | |
2191 | * the original object request for the copyup operation. | |
2192 | * | |
2193 | * If an error occurs, record it as the result of the original | |
2194 | * object request and mark it done so it gets completed. | |
2195 | */ | |
2196 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2197 | { | |
2198 | struct rbd_img_request *img_request = NULL; | |
2199 | struct rbd_img_request *parent_request = NULL; | |
2200 | struct rbd_device *rbd_dev; | |
2201 | u64 img_offset; | |
2202 | u64 length; | |
2203 | struct page **pages = NULL; | |
2204 | u32 page_count; | |
2205 | int result; | |
2206 | ||
2207 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2208 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2209 | ||
2210 | img_request = obj_request->img_request; | |
2211 | rbd_assert(img_request != NULL); | |
2212 | rbd_dev = img_request->rbd_dev; | |
2213 | rbd_assert(rbd_dev->parent != NULL); | |
2214 | ||
0eefd470 AE |
2215 | /* |
2216 | * First things first. The original osd request is of no | |
2217 | * use to use any more, we'll need a new one that can hold | |
2218 | * the two ops in a copyup request. We'll get that later, | |
2219 | * but for now we can release the old one. | |
2220 | */ | |
2221 | rbd_osd_req_destroy(obj_request->osd_req); | |
2222 | obj_request->osd_req = NULL; | |
2223 | ||
3d7efd18 AE |
2224 | /* |
2225 | * Determine the byte range covered by the object in the | |
2226 | * child image to which the original request was to be sent. | |
2227 | */ | |
2228 | img_offset = obj_request->img_offset - obj_request->offset; | |
2229 | length = (u64)1 << rbd_dev->header.obj_order; | |
2230 | ||
a9e8ba2c AE |
2231 | /* |
2232 | * There is no defined parent data beyond the parent | |
2233 | * overlap, so limit what we read at that boundary if | |
2234 | * necessary. | |
2235 | */ | |
2236 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2237 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2238 | length = rbd_dev->parent_overlap - img_offset; | |
2239 | } | |
2240 | ||
3d7efd18 AE |
2241 | /* |
2242 | * Allocate a page array big enough to receive the data read | |
2243 | * from the parent. | |
2244 | */ | |
2245 | page_count = (u32)calc_pages_for(0, length); | |
2246 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2247 | if (IS_ERR(pages)) { | |
2248 | result = PTR_ERR(pages); | |
2249 | pages = NULL; | |
2250 | goto out_err; | |
2251 | } | |
2252 | ||
2253 | result = -ENOMEM; | |
2254 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2255 | img_offset, length, | |
2256 | false, true); | |
2257 | if (!parent_request) | |
2258 | goto out_err; | |
2259 | rbd_obj_request_get(obj_request); | |
2260 | parent_request->obj_request = obj_request; | |
2261 | ||
2262 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2263 | if (result) | |
2264 | goto out_err; | |
2265 | parent_request->copyup_pages = pages; | |
2266 | ||
2267 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2268 | result = rbd_img_request_submit(parent_request); | |
2269 | if (!result) | |
2270 | return 0; | |
2271 | ||
2272 | parent_request->copyup_pages = NULL; | |
2273 | parent_request->obj_request = NULL; | |
2274 | rbd_obj_request_put(obj_request); | |
2275 | out_err: | |
2276 | if (pages) | |
2277 | ceph_release_page_vector(pages, page_count); | |
2278 | if (parent_request) | |
2279 | rbd_img_request_put(parent_request); | |
2280 | obj_request->result = result; | |
2281 | obj_request->xferred = 0; | |
2282 | obj_request_done_set(obj_request); | |
2283 | ||
2284 | return result; | |
2285 | } | |
2286 | ||
c5b5ef6c AE |
2287 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2288 | { | |
c5b5ef6c AE |
2289 | struct rbd_obj_request *orig_request; |
2290 | int result; | |
2291 | ||
2292 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2293 | ||
2294 | /* | |
2295 | * All we need from the object request is the original | |
2296 | * request and the result of the STAT op. Grab those, then | |
2297 | * we're done with the request. | |
2298 | */ | |
2299 | orig_request = obj_request->obj_request; | |
2300 | obj_request->obj_request = NULL; | |
2301 | rbd_assert(orig_request); | |
2302 | rbd_assert(orig_request->img_request); | |
2303 | ||
2304 | result = obj_request->result; | |
2305 | obj_request->result = 0; | |
2306 | ||
2307 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2308 | obj_request, orig_request, result, | |
2309 | obj_request->xferred, obj_request->length); | |
2310 | rbd_obj_request_put(obj_request); | |
2311 | ||
2312 | rbd_assert(orig_request); | |
2313 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2314 | |
2315 | /* | |
2316 | * Our only purpose here is to determine whether the object | |
2317 | * exists, and we don't want to treat the non-existence as | |
2318 | * an error. If something else comes back, transfer the | |
2319 | * error to the original request and complete it now. | |
2320 | */ | |
2321 | if (!result) { | |
2322 | obj_request_existence_set(orig_request, true); | |
2323 | } else if (result == -ENOENT) { | |
2324 | obj_request_existence_set(orig_request, false); | |
2325 | } else if (result) { | |
2326 | orig_request->result = result; | |
3d7efd18 | 2327 | goto out; |
c5b5ef6c AE |
2328 | } |
2329 | ||
2330 | /* | |
2331 | * Resubmit the original request now that we have recorded | |
2332 | * whether the target object exists. | |
2333 | */ | |
b454e36d | 2334 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2335 | out: |
c5b5ef6c AE |
2336 | if (orig_request->result) |
2337 | rbd_obj_request_complete(orig_request); | |
2338 | rbd_obj_request_put(orig_request); | |
2339 | } | |
2340 | ||
2341 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2342 | { | |
2343 | struct rbd_obj_request *stat_request; | |
2344 | struct rbd_device *rbd_dev; | |
2345 | struct ceph_osd_client *osdc; | |
2346 | struct page **pages = NULL; | |
2347 | u32 page_count; | |
2348 | size_t size; | |
2349 | int ret; | |
2350 | ||
2351 | /* | |
2352 | * The response data for a STAT call consists of: | |
2353 | * le64 length; | |
2354 | * struct { | |
2355 | * le32 tv_sec; | |
2356 | * le32 tv_nsec; | |
2357 | * } mtime; | |
2358 | */ | |
2359 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2360 | page_count = (u32)calc_pages_for(0, size); | |
2361 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2362 | if (IS_ERR(pages)) | |
2363 | return PTR_ERR(pages); | |
2364 | ||
2365 | ret = -ENOMEM; | |
2366 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2367 | OBJ_REQUEST_PAGES); | |
2368 | if (!stat_request) | |
2369 | goto out; | |
2370 | ||
2371 | rbd_obj_request_get(obj_request); | |
2372 | stat_request->obj_request = obj_request; | |
2373 | stat_request->pages = pages; | |
2374 | stat_request->page_count = page_count; | |
2375 | ||
2376 | rbd_assert(obj_request->img_request); | |
2377 | rbd_dev = obj_request->img_request->rbd_dev; | |
2378 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2379 | stat_request); | |
2380 | if (!stat_request->osd_req) | |
2381 | goto out; | |
2382 | stat_request->callback = rbd_img_obj_exists_callback; | |
2383 | ||
2384 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2385 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2386 | false, false); | |
9d4df01f | 2387 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2388 | |
2389 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2390 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2391 | out: | |
2392 | if (ret) | |
2393 | rbd_obj_request_put(obj_request); | |
2394 | ||
2395 | return ret; | |
2396 | } | |
2397 | ||
b454e36d AE |
2398 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2399 | { | |
2400 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2401 | struct rbd_device *rbd_dev; |
3d7efd18 | 2402 | bool known; |
b454e36d AE |
2403 | |
2404 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2405 | ||
2406 | img_request = obj_request->img_request; | |
2407 | rbd_assert(img_request); | |
a9e8ba2c | 2408 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2409 | |
b454e36d | 2410 | /* |
a9e8ba2c AE |
2411 | * Only writes to layered images need special handling. |
2412 | * Reads and non-layered writes are simple object requests. | |
2413 | * Layered writes that start beyond the end of the overlap | |
2414 | * with the parent have no parent data, so they too are | |
2415 | * simple object requests. Finally, if the target object is | |
2416 | * known to already exist, its parent data has already been | |
2417 | * copied, so a write to the object can also be handled as a | |
2418 | * simple object request. | |
b454e36d AE |
2419 | */ |
2420 | if (!img_request_write_test(img_request) || | |
2421 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2422 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2423 | ((known = obj_request_known_test(obj_request)) && |
2424 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2425 | |
2426 | struct rbd_device *rbd_dev; | |
2427 | struct ceph_osd_client *osdc; | |
2428 | ||
2429 | rbd_dev = obj_request->img_request->rbd_dev; | |
2430 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2431 | ||
2432 | return rbd_obj_request_submit(osdc, obj_request); | |
2433 | } | |
2434 | ||
2435 | /* | |
3d7efd18 AE |
2436 | * It's a layered write. The target object might exist but |
2437 | * we may not know that yet. If we know it doesn't exist, | |
2438 | * start by reading the data for the full target object from | |
2439 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2440 | */ |
3d7efd18 AE |
2441 | if (known) |
2442 | return rbd_img_obj_parent_read_full(obj_request); | |
2443 | ||
2444 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2445 | |
2446 | return rbd_img_obj_exists_submit(obj_request); | |
2447 | } | |
2448 | ||
bf0d5f50 AE |
2449 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2450 | { | |
bf0d5f50 | 2451 | struct rbd_obj_request *obj_request; |
46faeed4 | 2452 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2453 | |
37206ee5 | 2454 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2455 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2456 | int ret; |
2457 | ||
b454e36d | 2458 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2459 | if (ret) |
2460 | return ret; | |
bf0d5f50 AE |
2461 | } |
2462 | ||
2463 | return 0; | |
2464 | } | |
8b3e1a56 AE |
2465 | |
2466 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2467 | { | |
2468 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2469 | struct rbd_device *rbd_dev; |
2470 | u64 obj_end; | |
8b3e1a56 AE |
2471 | |
2472 | rbd_assert(img_request_child_test(img_request)); | |
2473 | ||
2474 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2475 | rbd_assert(obj_request); |
2476 | rbd_assert(obj_request->img_request); | |
2477 | ||
8b3e1a56 | 2478 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2479 | if (obj_request->result) |
2480 | goto out; | |
2481 | ||
2482 | /* | |
2483 | * We need to zero anything beyond the parent overlap | |
2484 | * boundary. Since rbd_img_obj_request_read_callback() | |
2485 | * will zero anything beyond the end of a short read, an | |
2486 | * easy way to do this is to pretend the data from the | |
2487 | * parent came up short--ending at the overlap boundary. | |
2488 | */ | |
2489 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2490 | obj_end = obj_request->img_offset + obj_request->length; | |
2491 | rbd_dev = obj_request->img_request->rbd_dev; | |
2492 | if (obj_end > rbd_dev->parent_overlap) { | |
2493 | u64 xferred = 0; | |
2494 | ||
2495 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2496 | xferred = rbd_dev->parent_overlap - | |
2497 | obj_request->img_offset; | |
8b3e1a56 | 2498 | |
a9e8ba2c AE |
2499 | obj_request->xferred = min(img_request->xferred, xferred); |
2500 | } else { | |
2501 | obj_request->xferred = img_request->xferred; | |
2502 | } | |
2503 | out: | |
8b3e1a56 AE |
2504 | rbd_img_obj_request_read_callback(obj_request); |
2505 | rbd_obj_request_complete(obj_request); | |
2506 | } | |
2507 | ||
2508 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2509 | { | |
2510 | struct rbd_device *rbd_dev; | |
2511 | struct rbd_img_request *img_request; | |
2512 | int result; | |
2513 | ||
2514 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2515 | rbd_assert(obj_request->img_request != NULL); | |
2516 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2517 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2518 | ||
2519 | rbd_dev = obj_request->img_request->rbd_dev; | |
2520 | rbd_assert(rbd_dev->parent != NULL); | |
2521 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2522 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2523 | obj_request->img_offset, | |
2524 | obj_request->length, | |
2525 | false, true); | |
2526 | result = -ENOMEM; | |
2527 | if (!img_request) | |
2528 | goto out_err; | |
2529 | ||
2530 | rbd_obj_request_get(obj_request); | |
2531 | img_request->obj_request = obj_request; | |
2532 | ||
f1a4739f AE |
2533 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2534 | obj_request->bio_list); | |
8b3e1a56 AE |
2535 | if (result) |
2536 | goto out_err; | |
2537 | ||
2538 | img_request->callback = rbd_img_parent_read_callback; | |
2539 | result = rbd_img_request_submit(img_request); | |
2540 | if (result) | |
2541 | goto out_err; | |
2542 | ||
2543 | return; | |
2544 | out_err: | |
2545 | if (img_request) | |
2546 | rbd_img_request_put(img_request); | |
2547 | obj_request->result = result; | |
2548 | obj_request->xferred = 0; | |
2549 | obj_request_done_set(obj_request); | |
2550 | } | |
bf0d5f50 | 2551 | |
cc4a38bd | 2552 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2553 | { |
2554 | struct rbd_obj_request *obj_request; | |
2169238d | 2555 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2556 | int ret; |
2557 | ||
2558 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2559 | OBJ_REQUEST_NODATA); | |
2560 | if (!obj_request) | |
2561 | return -ENOMEM; | |
2562 | ||
2563 | ret = -ENOMEM; | |
430c28c3 | 2564 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2565 | if (!obj_request->osd_req) |
2566 | goto out; | |
2169238d | 2567 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2568 | |
c99d2d4a | 2569 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2570 | notify_id, 0, 0); |
9d4df01f | 2571 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2572 | |
b8d70035 | 2573 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2574 | out: |
cf81b60e AE |
2575 | if (ret) |
2576 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2577 | |
2578 | return ret; | |
2579 | } | |
2580 | ||
2581 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2582 | { | |
2583 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
b8d70035 AE |
2584 | |
2585 | if (!rbd_dev) | |
2586 | return; | |
2587 | ||
37206ee5 | 2588 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2589 | rbd_dev->header_name, (unsigned long long)notify_id, |
2590 | (unsigned int)opcode); | |
2591 | (void)rbd_dev_refresh(rbd_dev); | |
b8d70035 | 2592 | |
cc4a38bd | 2593 | rbd_obj_notify_ack(rbd_dev, notify_id); |
b8d70035 AE |
2594 | } |
2595 | ||
9969ebc5 AE |
2596 | /* |
2597 | * Request sync osd watch/unwatch. The value of "start" determines | |
2598 | * whether a watch request is being initiated or torn down. | |
2599 | */ | |
2600 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2601 | { | |
2602 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2603 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2604 | int ret; |
2605 | ||
2606 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2607 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2608 | ||
2609 | if (start) { | |
3c663bbd | 2610 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2611 | &rbd_dev->watch_event); |
2612 | if (ret < 0) | |
2613 | return ret; | |
8eb87565 | 2614 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2615 | } |
2616 | ||
2617 | ret = -ENOMEM; | |
2618 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2619 | OBJ_REQUEST_NODATA); | |
2620 | if (!obj_request) | |
2621 | goto out_cancel; | |
2622 | ||
430c28c3 AE |
2623 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2624 | if (!obj_request->osd_req) | |
2625 | goto out_cancel; | |
2626 | ||
8eb87565 | 2627 | if (start) |
975241af | 2628 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2629 | else |
6977c3f9 | 2630 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2631 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2632 | |
2633 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
b21ebddd | 2634 | rbd_dev->watch_event->cookie, 0, start); |
9d4df01f | 2635 | rbd_osd_req_format_write(obj_request); |
2169238d | 2636 | |
9969ebc5 AE |
2637 | ret = rbd_obj_request_submit(osdc, obj_request); |
2638 | if (ret) | |
2639 | goto out_cancel; | |
2640 | ret = rbd_obj_request_wait(obj_request); | |
2641 | if (ret) | |
2642 | goto out_cancel; | |
9969ebc5 AE |
2643 | ret = obj_request->result; |
2644 | if (ret) | |
2645 | goto out_cancel; | |
2646 | ||
8eb87565 AE |
2647 | /* |
2648 | * A watch request is set to linger, so the underlying osd | |
2649 | * request won't go away until we unregister it. We retain | |
2650 | * a pointer to the object request during that time (in | |
2651 | * rbd_dev->watch_request), so we'll keep a reference to | |
2652 | * it. We'll drop that reference (below) after we've | |
2653 | * unregistered it. | |
2654 | */ | |
2655 | if (start) { | |
2656 | rbd_dev->watch_request = obj_request; | |
2657 | ||
2658 | return 0; | |
2659 | } | |
2660 | ||
2661 | /* We have successfully torn down the watch request */ | |
2662 | ||
2663 | rbd_obj_request_put(rbd_dev->watch_request); | |
2664 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2665 | out_cancel: |
2666 | /* Cancel the event if we're tearing down, or on error */ | |
2667 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2668 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2669 | if (obj_request) |
2670 | rbd_obj_request_put(obj_request); | |
2671 | ||
2672 | return ret; | |
2673 | } | |
2674 | ||
36be9a76 | 2675 | /* |
f40eb349 AE |
2676 | * Synchronous osd object method call. Returns the number of bytes |
2677 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
2678 | */ |
2679 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2680 | const char *object_name, | |
2681 | const char *class_name, | |
2682 | const char *method_name, | |
4157976b | 2683 | const void *outbound, |
36be9a76 | 2684 | size_t outbound_size, |
4157976b | 2685 | void *inbound, |
e2a58ee5 | 2686 | size_t inbound_size) |
36be9a76 | 2687 | { |
2169238d | 2688 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2689 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2690 | struct page **pages; |
2691 | u32 page_count; | |
2692 | int ret; | |
2693 | ||
2694 | /* | |
6010a451 AE |
2695 | * Method calls are ultimately read operations. The result |
2696 | * should placed into the inbound buffer provided. They | |
2697 | * also supply outbound data--parameters for the object | |
2698 | * method. Currently if this is present it will be a | |
2699 | * snapshot id. | |
36be9a76 | 2700 | */ |
57385b51 | 2701 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
2702 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2703 | if (IS_ERR(pages)) | |
2704 | return PTR_ERR(pages); | |
2705 | ||
2706 | ret = -ENOMEM; | |
6010a451 | 2707 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2708 | OBJ_REQUEST_PAGES); |
2709 | if (!obj_request) | |
2710 | goto out; | |
2711 | ||
2712 | obj_request->pages = pages; | |
2713 | obj_request->page_count = page_count; | |
2714 | ||
430c28c3 | 2715 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2716 | if (!obj_request->osd_req) |
2717 | goto out; | |
2718 | ||
c99d2d4a | 2719 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2720 | class_name, method_name); |
2721 | if (outbound_size) { | |
2722 | struct ceph_pagelist *pagelist; | |
2723 | ||
2724 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2725 | if (!pagelist) | |
2726 | goto out; | |
2727 | ||
2728 | ceph_pagelist_init(pagelist); | |
2729 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2730 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2731 | pagelist); | |
2732 | } | |
a4ce40a9 AE |
2733 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2734 | obj_request->pages, inbound_size, | |
44cd188d | 2735 | 0, false, false); |
9d4df01f | 2736 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2737 | |
36be9a76 AE |
2738 | ret = rbd_obj_request_submit(osdc, obj_request); |
2739 | if (ret) | |
2740 | goto out; | |
2741 | ret = rbd_obj_request_wait(obj_request); | |
2742 | if (ret) | |
2743 | goto out; | |
2744 | ||
2745 | ret = obj_request->result; | |
2746 | if (ret < 0) | |
2747 | goto out; | |
57385b51 AE |
2748 | |
2749 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
2750 | ret = (int)obj_request->xferred; | |
903bb32e | 2751 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2752 | out: |
2753 | if (obj_request) | |
2754 | rbd_obj_request_put(obj_request); | |
2755 | else | |
2756 | ceph_release_page_vector(pages, page_count); | |
2757 | ||
2758 | return ret; | |
2759 | } | |
2760 | ||
bf0d5f50 | 2761 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2762 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2763 | { |
2764 | struct rbd_device *rbd_dev = q->queuedata; | |
2765 | bool read_only = rbd_dev->mapping.read_only; | |
2766 | struct request *rq; | |
2767 | int result; | |
2768 | ||
2769 | while ((rq = blk_fetch_request(q))) { | |
2770 | bool write_request = rq_data_dir(rq) == WRITE; | |
2771 | struct rbd_img_request *img_request; | |
2772 | u64 offset; | |
2773 | u64 length; | |
2774 | ||
2775 | /* Ignore any non-FS requests that filter through. */ | |
2776 | ||
2777 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2778 | dout("%s: non-fs request type %d\n", __func__, |
2779 | (int) rq->cmd_type); | |
2780 | __blk_end_request_all(rq, 0); | |
2781 | continue; | |
2782 | } | |
2783 | ||
2784 | /* Ignore/skip any zero-length requests */ | |
2785 | ||
2786 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2787 | length = (u64) blk_rq_bytes(rq); | |
2788 | ||
2789 | if (!length) { | |
2790 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2791 | __blk_end_request_all(rq, 0); |
2792 | continue; | |
2793 | } | |
2794 | ||
2795 | spin_unlock_irq(q->queue_lock); | |
2796 | ||
2797 | /* Disallow writes to a read-only device */ | |
2798 | ||
2799 | if (write_request) { | |
2800 | result = -EROFS; | |
2801 | if (read_only) | |
2802 | goto end_request; | |
2803 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2804 | } | |
2805 | ||
6d292906 AE |
2806 | /* |
2807 | * Quit early if the mapped snapshot no longer | |
2808 | * exists. It's still possible the snapshot will | |
2809 | * have disappeared by the time our request arrives | |
2810 | * at the osd, but there's no sense in sending it if | |
2811 | * we already know. | |
2812 | */ | |
2813 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2814 | dout("request for non-existent snapshot"); |
2815 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2816 | result = -ENXIO; | |
2817 | goto end_request; | |
2818 | } | |
2819 | ||
bf0d5f50 | 2820 | result = -EINVAL; |
c0cd10db AE |
2821 | if (offset && length > U64_MAX - offset + 1) { |
2822 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n", | |
2823 | offset, length); | |
bf0d5f50 | 2824 | goto end_request; /* Shouldn't happen */ |
c0cd10db | 2825 | } |
bf0d5f50 AE |
2826 | |
2827 | result = -ENOMEM; | |
2828 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2829 | write_request, false); |
bf0d5f50 AE |
2830 | if (!img_request) |
2831 | goto end_request; | |
2832 | ||
2833 | img_request->rq = rq; | |
2834 | ||
f1a4739f AE |
2835 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2836 | rq->bio); | |
bf0d5f50 AE |
2837 | if (!result) |
2838 | result = rbd_img_request_submit(img_request); | |
2839 | if (result) | |
2840 | rbd_img_request_put(img_request); | |
2841 | end_request: | |
2842 | spin_lock_irq(q->queue_lock); | |
2843 | if (result < 0) { | |
7da22d29 AE |
2844 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2845 | write_request ? "write" : "read", | |
2846 | length, offset, result); | |
2847 | ||
bf0d5f50 AE |
2848 | __blk_end_request_all(rq, result); |
2849 | } | |
2850 | } | |
2851 | } | |
2852 | ||
602adf40 YS |
2853 | /* |
2854 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2855 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2856 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2857 | */ |
2858 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2859 | struct bio_vec *bvec) | |
2860 | { | |
2861 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2862 | sector_t sector_offset; |
2863 | sector_t sectors_per_obj; | |
2864 | sector_t obj_sector_offset; | |
2865 | int ret; | |
2866 | ||
2867 | /* | |
2868 | * Find how far into its rbd object the partition-relative | |
2869 | * bio start sector is to offset relative to the enclosing | |
2870 | * device. | |
2871 | */ | |
2872 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2873 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2874 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2875 | ||
2876 | /* | |
2877 | * Compute the number of bytes from that offset to the end | |
2878 | * of the object. Account for what's already used by the bio. | |
2879 | */ | |
2880 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2881 | if (ret > bmd->bi_size) | |
2882 | ret -= bmd->bi_size; | |
2883 | else | |
2884 | ret = 0; | |
2885 | ||
2886 | /* | |
2887 | * Don't send back more than was asked for. And if the bio | |
2888 | * was empty, let the whole thing through because: "Note | |
2889 | * that a block device *must* allow a single page to be | |
2890 | * added to an empty bio." | |
2891 | */ | |
2892 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2893 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2894 | ret = (int) bvec->bv_len; | |
2895 | ||
2896 | return ret; | |
602adf40 YS |
2897 | } |
2898 | ||
2899 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2900 | { | |
2901 | struct gendisk *disk = rbd_dev->disk; | |
2902 | ||
2903 | if (!disk) | |
2904 | return; | |
2905 | ||
a0cab924 AE |
2906 | rbd_dev->disk = NULL; |
2907 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 2908 | del_gendisk(disk); |
a0cab924 AE |
2909 | if (disk->queue) |
2910 | blk_cleanup_queue(disk->queue); | |
2911 | } | |
602adf40 YS |
2912 | put_disk(disk); |
2913 | } | |
2914 | ||
788e2df3 AE |
2915 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2916 | const char *object_name, | |
7097f8df | 2917 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
2918 | |
2919 | { | |
2169238d | 2920 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2921 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2922 | struct page **pages = NULL; |
2923 | u32 page_count; | |
1ceae7ef | 2924 | size_t size; |
788e2df3 AE |
2925 | int ret; |
2926 | ||
2927 | page_count = (u32) calc_pages_for(offset, length); | |
2928 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2929 | if (IS_ERR(pages)) | |
2930 | ret = PTR_ERR(pages); | |
2931 | ||
2932 | ret = -ENOMEM; | |
2933 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2934 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2935 | if (!obj_request) |
2936 | goto out; | |
2937 | ||
2938 | obj_request->pages = pages; | |
2939 | obj_request->page_count = page_count; | |
2940 | ||
430c28c3 | 2941 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2942 | if (!obj_request->osd_req) |
2943 | goto out; | |
2944 | ||
c99d2d4a AE |
2945 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2946 | offset, length, 0, 0); | |
406e2c9f | 2947 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2948 | obj_request->pages, |
44cd188d AE |
2949 | obj_request->length, |
2950 | obj_request->offset & ~PAGE_MASK, | |
2951 | false, false); | |
9d4df01f | 2952 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2953 | |
788e2df3 AE |
2954 | ret = rbd_obj_request_submit(osdc, obj_request); |
2955 | if (ret) | |
2956 | goto out; | |
2957 | ret = rbd_obj_request_wait(obj_request); | |
2958 | if (ret) | |
2959 | goto out; | |
2960 | ||
2961 | ret = obj_request->result; | |
2962 | if (ret < 0) | |
2963 | goto out; | |
1ceae7ef AE |
2964 | |
2965 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2966 | size = (size_t) obj_request->xferred; | |
903bb32e | 2967 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
2968 | rbd_assert(size <= (size_t)INT_MAX); |
2969 | ret = (int)size; | |
788e2df3 AE |
2970 | out: |
2971 | if (obj_request) | |
2972 | rbd_obj_request_put(obj_request); | |
2973 | else | |
2974 | ceph_release_page_vector(pages, page_count); | |
2975 | ||
2976 | return ret; | |
2977 | } | |
2978 | ||
602adf40 | 2979 | /* |
4156d998 AE |
2980 | * Read the complete header for the given rbd device. |
2981 | * | |
2982 | * Returns a pointer to a dynamically-allocated buffer containing | |
2983 | * the complete and validated header. Caller can pass the address | |
2984 | * of a variable that will be filled in with the version of the | |
2985 | * header object at the time it was read. | |
2986 | * | |
2987 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2988 | */ |
4156d998 | 2989 | static struct rbd_image_header_ondisk * |
7097f8df | 2990 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev) |
602adf40 | 2991 | { |
4156d998 | 2992 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2993 | u32 snap_count = 0; |
4156d998 AE |
2994 | u64 names_size = 0; |
2995 | u32 want_count; | |
2996 | int ret; | |
602adf40 | 2997 | |
00f1f36f | 2998 | /* |
4156d998 AE |
2999 | * The complete header will include an array of its 64-bit |
3000 | * snapshot ids, followed by the names of those snapshots as | |
3001 | * a contiguous block of NUL-terminated strings. Note that | |
3002 | * the number of snapshots could change by the time we read | |
3003 | * it in, in which case we re-read it. | |
00f1f36f | 3004 | */ |
4156d998 AE |
3005 | do { |
3006 | size_t size; | |
3007 | ||
3008 | kfree(ondisk); | |
3009 | ||
3010 | size = sizeof (*ondisk); | |
3011 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3012 | size += names_size; | |
3013 | ondisk = kmalloc(size, GFP_KERNEL); | |
3014 | if (!ondisk) | |
3015 | return ERR_PTR(-ENOMEM); | |
3016 | ||
788e2df3 | 3017 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 3018 | 0, size, ondisk); |
4156d998 AE |
3019 | if (ret < 0) |
3020 | goto out_err; | |
c0cd10db | 3021 | if ((size_t)ret < size) { |
4156d998 | 3022 | ret = -ENXIO; |
06ecc6cb AE |
3023 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3024 | size, ret); | |
4156d998 AE |
3025 | goto out_err; |
3026 | } | |
3027 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3028 | ret = -ENXIO; | |
06ecc6cb | 3029 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 3030 | goto out_err; |
81e759fb | 3031 | } |
602adf40 | 3032 | |
4156d998 AE |
3033 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3034 | want_count = snap_count; | |
3035 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3036 | } while (snap_count != want_count); | |
00f1f36f | 3037 | |
4156d998 | 3038 | return ondisk; |
00f1f36f | 3039 | |
4156d998 AE |
3040 | out_err: |
3041 | kfree(ondisk); | |
3042 | ||
3043 | return ERR_PTR(ret); | |
3044 | } | |
3045 | ||
3046 | /* | |
3047 | * reload the ondisk the header | |
3048 | */ | |
3049 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
3050 | struct rbd_image_header *header) | |
3051 | { | |
3052 | struct rbd_image_header_ondisk *ondisk; | |
4156d998 | 3053 | int ret; |
602adf40 | 3054 | |
7097f8df | 3055 | ondisk = rbd_dev_v1_header_read(rbd_dev); |
4156d998 AE |
3056 | if (IS_ERR(ondisk)) |
3057 | return PTR_ERR(ondisk); | |
3058 | ret = rbd_header_from_disk(header, ondisk); | |
4156d998 AE |
3059 | kfree(ondisk); |
3060 | ||
3061 | return ret; | |
602adf40 YS |
3062 | } |
3063 | ||
9478554a AE |
3064 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
3065 | { | |
0d7dbfce | 3066 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
3067 | return; |
3068 | ||
e28626a0 AE |
3069 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) { |
3070 | sector_t size; | |
3071 | ||
3072 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
3073 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3074 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3075 | set_capacity(rbd_dev->disk, size); | |
3076 | } | |
9478554a AE |
3077 | } |
3078 | ||
602adf40 YS |
3079 | /* |
3080 | * only read the first part of the ondisk header, without the snaps info | |
3081 | */ | |
cc4a38bd | 3082 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev) |
602adf40 YS |
3083 | { |
3084 | int ret; | |
3085 | struct rbd_image_header h; | |
602adf40 YS |
3086 | |
3087 | ret = rbd_read_header(rbd_dev, &h); | |
3088 | if (ret < 0) | |
3089 | return ret; | |
3090 | ||
a51aa0c0 JD |
3091 | down_write(&rbd_dev->header_rwsem); |
3092 | ||
9478554a AE |
3093 | /* Update image size, and check for resize of mapped image */ |
3094 | rbd_dev->header.image_size = h.image_size; | |
3095 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 3096 | |
849b4260 | 3097 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3098 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3099 | kfree(rbd_dev->header.snap_names); |
d1d25646 | 3100 | /* osd requests may still refer to snapc */ |
812164f8 | 3101 | ceph_put_snap_context(rbd_dev->header.snapc); |
602adf40 | 3102 | |
93a24e08 | 3103 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3104 | rbd_dev->header.snapc = h.snapc; |
3105 | rbd_dev->header.snap_names = h.snap_names; | |
3106 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 | 3107 | /* Free the extra copy of the object prefix */ |
c0cd10db AE |
3108 | if (strcmp(rbd_dev->header.object_prefix, h.object_prefix)) |
3109 | rbd_warn(rbd_dev, "object prefix changed (ignoring)"); | |
849b4260 AE |
3110 | kfree(h.object_prefix); |
3111 | ||
c666601a | 3112 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3113 | |
dfc5606d | 3114 | return ret; |
602adf40 YS |
3115 | } |
3116 | ||
cc4a38bd | 3117 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3118 | { |
a3fbe5d4 | 3119 | u64 image_size; |
1fe5e993 AE |
3120 | int ret; |
3121 | ||
117973fb | 3122 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
a3fbe5d4 | 3123 | image_size = rbd_dev->header.image_size; |
1fe5e993 | 3124 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb | 3125 | if (rbd_dev->image_format == 1) |
cc4a38bd | 3126 | ret = rbd_dev_v1_refresh(rbd_dev); |
117973fb | 3127 | else |
cc4a38bd | 3128 | ret = rbd_dev_v2_refresh(rbd_dev); |
1fe5e993 | 3129 | mutex_unlock(&ctl_mutex); |
522a0cc0 AE |
3130 | if (ret) |
3131 | rbd_warn(rbd_dev, "got notification but failed to " | |
3132 | " update snaps: %d\n", ret); | |
a3fbe5d4 AE |
3133 | if (image_size != rbd_dev->header.image_size) |
3134 | revalidate_disk(rbd_dev->disk); | |
1fe5e993 AE |
3135 | |
3136 | return ret; | |
3137 | } | |
3138 | ||
602adf40 YS |
3139 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3140 | { | |
3141 | struct gendisk *disk; | |
3142 | struct request_queue *q; | |
593a9e7b | 3143 | u64 segment_size; |
602adf40 | 3144 | |
602adf40 | 3145 | /* create gendisk info */ |
602adf40 YS |
3146 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3147 | if (!disk) | |
1fcdb8aa | 3148 | return -ENOMEM; |
602adf40 | 3149 | |
f0f8cef5 | 3150 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3151 | rbd_dev->dev_id); |
602adf40 YS |
3152 | disk->major = rbd_dev->major; |
3153 | disk->first_minor = 0; | |
3154 | disk->fops = &rbd_bd_ops; | |
3155 | disk->private_data = rbd_dev; | |
3156 | ||
bf0d5f50 | 3157 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3158 | if (!q) |
3159 | goto out_disk; | |
029bcbd8 | 3160 | |
593a9e7b AE |
3161 | /* We use the default size, but let's be explicit about it. */ |
3162 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3163 | ||
029bcbd8 | 3164 | /* set io sizes to object size */ |
593a9e7b AE |
3165 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3166 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3167 | blk_queue_max_segment_size(q, segment_size); | |
3168 | blk_queue_io_min(q, segment_size); | |
3169 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3170 | |
602adf40 YS |
3171 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3172 | disk->queue = q; | |
3173 | ||
3174 | q->queuedata = rbd_dev; | |
3175 | ||
3176 | rbd_dev->disk = disk; | |
602adf40 | 3177 | |
602adf40 | 3178 | return 0; |
602adf40 YS |
3179 | out_disk: |
3180 | put_disk(disk); | |
1fcdb8aa AE |
3181 | |
3182 | return -ENOMEM; | |
602adf40 YS |
3183 | } |
3184 | ||
dfc5606d YS |
3185 | /* |
3186 | sysfs | |
3187 | */ | |
3188 | ||
593a9e7b AE |
3189 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3190 | { | |
3191 | return container_of(dev, struct rbd_device, dev); | |
3192 | } | |
3193 | ||
dfc5606d YS |
3194 | static ssize_t rbd_size_show(struct device *dev, |
3195 | struct device_attribute *attr, char *buf) | |
3196 | { | |
593a9e7b | 3197 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3198 | |
fc71d833 AE |
3199 | return sprintf(buf, "%llu\n", |
3200 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3201 | } |
3202 | ||
34b13184 AE |
3203 | /* |
3204 | * Note this shows the features for whatever's mapped, which is not | |
3205 | * necessarily the base image. | |
3206 | */ | |
3207 | static ssize_t rbd_features_show(struct device *dev, | |
3208 | struct device_attribute *attr, char *buf) | |
3209 | { | |
3210 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3211 | ||
3212 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3213 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3214 | } |
3215 | ||
dfc5606d YS |
3216 | static ssize_t rbd_major_show(struct device *dev, |
3217 | struct device_attribute *attr, char *buf) | |
3218 | { | |
593a9e7b | 3219 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3220 | |
fc71d833 AE |
3221 | if (rbd_dev->major) |
3222 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3223 | ||
3224 | return sprintf(buf, "(none)\n"); | |
3225 | ||
dfc5606d YS |
3226 | } |
3227 | ||
3228 | static ssize_t rbd_client_id_show(struct device *dev, | |
3229 | struct device_attribute *attr, char *buf) | |
602adf40 | 3230 | { |
593a9e7b | 3231 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3232 | |
1dbb4399 AE |
3233 | return sprintf(buf, "client%lld\n", |
3234 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3235 | } |
3236 | ||
dfc5606d YS |
3237 | static ssize_t rbd_pool_show(struct device *dev, |
3238 | struct device_attribute *attr, char *buf) | |
602adf40 | 3239 | { |
593a9e7b | 3240 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3241 | |
0d7dbfce | 3242 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3243 | } |
3244 | ||
9bb2f334 AE |
3245 | static ssize_t rbd_pool_id_show(struct device *dev, |
3246 | struct device_attribute *attr, char *buf) | |
3247 | { | |
3248 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3249 | ||
0d7dbfce | 3250 | return sprintf(buf, "%llu\n", |
fc71d833 | 3251 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3252 | } |
3253 | ||
dfc5606d YS |
3254 | static ssize_t rbd_name_show(struct device *dev, |
3255 | struct device_attribute *attr, char *buf) | |
3256 | { | |
593a9e7b | 3257 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3258 | |
a92ffdf8 AE |
3259 | if (rbd_dev->spec->image_name) |
3260 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3261 | ||
3262 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3263 | } |
3264 | ||
589d30e0 AE |
3265 | static ssize_t rbd_image_id_show(struct device *dev, |
3266 | struct device_attribute *attr, char *buf) | |
3267 | { | |
3268 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3269 | ||
0d7dbfce | 3270 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3271 | } |
3272 | ||
34b13184 AE |
3273 | /* |
3274 | * Shows the name of the currently-mapped snapshot (or | |
3275 | * RBD_SNAP_HEAD_NAME for the base image). | |
3276 | */ | |
dfc5606d YS |
3277 | static ssize_t rbd_snap_show(struct device *dev, |
3278 | struct device_attribute *attr, | |
3279 | char *buf) | |
3280 | { | |
593a9e7b | 3281 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3282 | |
0d7dbfce | 3283 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3284 | } |
3285 | ||
86b00e0d AE |
3286 | /* |
3287 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3288 | * for the parent image. If there is no parent, simply shows | |
3289 | * "(no parent image)". | |
3290 | */ | |
3291 | static ssize_t rbd_parent_show(struct device *dev, | |
3292 | struct device_attribute *attr, | |
3293 | char *buf) | |
3294 | { | |
3295 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3296 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3297 | int count; | |
3298 | char *bufp = buf; | |
3299 | ||
3300 | if (!spec) | |
3301 | return sprintf(buf, "(no parent image)\n"); | |
3302 | ||
3303 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3304 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3305 | if (count < 0) | |
3306 | return count; | |
3307 | bufp += count; | |
3308 | ||
3309 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3310 | spec->image_name ? spec->image_name : "(unknown)"); | |
3311 | if (count < 0) | |
3312 | return count; | |
3313 | bufp += count; | |
3314 | ||
3315 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3316 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3317 | if (count < 0) | |
3318 | return count; | |
3319 | bufp += count; | |
3320 | ||
3321 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3322 | if (count < 0) | |
3323 | return count; | |
3324 | bufp += count; | |
3325 | ||
3326 | return (ssize_t) (bufp - buf); | |
3327 | } | |
3328 | ||
dfc5606d YS |
3329 | static ssize_t rbd_image_refresh(struct device *dev, |
3330 | struct device_attribute *attr, | |
3331 | const char *buf, | |
3332 | size_t size) | |
3333 | { | |
593a9e7b | 3334 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3335 | int ret; |
602adf40 | 3336 | |
cc4a38bd | 3337 | ret = rbd_dev_refresh(rbd_dev); |
b813623a AE |
3338 | |
3339 | return ret < 0 ? ret : size; | |
dfc5606d | 3340 | } |
602adf40 | 3341 | |
dfc5606d | 3342 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3343 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3344 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3345 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3346 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3347 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3348 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3349 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3350 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3351 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3352 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3353 | |
3354 | static struct attribute *rbd_attrs[] = { | |
3355 | &dev_attr_size.attr, | |
34b13184 | 3356 | &dev_attr_features.attr, |
dfc5606d YS |
3357 | &dev_attr_major.attr, |
3358 | &dev_attr_client_id.attr, | |
3359 | &dev_attr_pool.attr, | |
9bb2f334 | 3360 | &dev_attr_pool_id.attr, |
dfc5606d | 3361 | &dev_attr_name.attr, |
589d30e0 | 3362 | &dev_attr_image_id.attr, |
dfc5606d | 3363 | &dev_attr_current_snap.attr, |
86b00e0d | 3364 | &dev_attr_parent.attr, |
dfc5606d | 3365 | &dev_attr_refresh.attr, |
dfc5606d YS |
3366 | NULL |
3367 | }; | |
3368 | ||
3369 | static struct attribute_group rbd_attr_group = { | |
3370 | .attrs = rbd_attrs, | |
3371 | }; | |
3372 | ||
3373 | static const struct attribute_group *rbd_attr_groups[] = { | |
3374 | &rbd_attr_group, | |
3375 | NULL | |
3376 | }; | |
3377 | ||
3378 | static void rbd_sysfs_dev_release(struct device *dev) | |
3379 | { | |
3380 | } | |
3381 | ||
3382 | static struct device_type rbd_device_type = { | |
3383 | .name = "rbd", | |
3384 | .groups = rbd_attr_groups, | |
3385 | .release = rbd_sysfs_dev_release, | |
3386 | }; | |
3387 | ||
8b8fb99c AE |
3388 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3389 | { | |
3390 | kref_get(&spec->kref); | |
3391 | ||
3392 | return spec; | |
3393 | } | |
3394 | ||
3395 | static void rbd_spec_free(struct kref *kref); | |
3396 | static void rbd_spec_put(struct rbd_spec *spec) | |
3397 | { | |
3398 | if (spec) | |
3399 | kref_put(&spec->kref, rbd_spec_free); | |
3400 | } | |
3401 | ||
3402 | static struct rbd_spec *rbd_spec_alloc(void) | |
3403 | { | |
3404 | struct rbd_spec *spec; | |
3405 | ||
3406 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3407 | if (!spec) | |
3408 | return NULL; | |
3409 | kref_init(&spec->kref); | |
3410 | ||
8b8fb99c AE |
3411 | return spec; |
3412 | } | |
3413 | ||
3414 | static void rbd_spec_free(struct kref *kref) | |
3415 | { | |
3416 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3417 | ||
3418 | kfree(spec->pool_name); | |
3419 | kfree(spec->image_id); | |
3420 | kfree(spec->image_name); | |
3421 | kfree(spec->snap_name); | |
3422 | kfree(spec); | |
3423 | } | |
3424 | ||
cc344fa1 | 3425 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3426 | struct rbd_spec *spec) |
3427 | { | |
3428 | struct rbd_device *rbd_dev; | |
3429 | ||
3430 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3431 | if (!rbd_dev) | |
3432 | return NULL; | |
3433 | ||
3434 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3435 | rbd_dev->flags = 0; |
c53d5893 | 3436 | INIT_LIST_HEAD(&rbd_dev->node); |
c53d5893 AE |
3437 | init_rwsem(&rbd_dev->header_rwsem); |
3438 | ||
3439 | rbd_dev->spec = spec; | |
3440 | rbd_dev->rbd_client = rbdc; | |
3441 | ||
0903e875 AE |
3442 | /* Initialize the layout used for all rbd requests */ |
3443 | ||
3444 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3445 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3446 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3447 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3448 | ||
c53d5893 AE |
3449 | return rbd_dev; |
3450 | } | |
3451 | ||
3452 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3453 | { | |
c53d5893 AE |
3454 | rbd_put_client(rbd_dev->rbd_client); |
3455 | rbd_spec_put(rbd_dev->spec); | |
3456 | kfree(rbd_dev); | |
3457 | } | |
3458 | ||
9d475de5 AE |
3459 | /* |
3460 | * Get the size and object order for an image snapshot, or if | |
3461 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3462 | * image. | |
3463 | */ | |
3464 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3465 | u8 *order, u64 *snap_size) | |
3466 | { | |
3467 | __le64 snapid = cpu_to_le64(snap_id); | |
3468 | int ret; | |
3469 | struct { | |
3470 | u8 order; | |
3471 | __le64 size; | |
3472 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3473 | ||
36be9a76 | 3474 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3475 | "rbd", "get_size", |
4157976b | 3476 | &snapid, sizeof (snapid), |
e2a58ee5 | 3477 | &size_buf, sizeof (size_buf)); |
36be9a76 | 3478 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3479 | if (ret < 0) |
3480 | return ret; | |
57385b51 AE |
3481 | if (ret < sizeof (size_buf)) |
3482 | return -ERANGE; | |
9d475de5 | 3483 | |
c86f86e9 AE |
3484 | if (order) |
3485 | *order = size_buf.order; | |
9d475de5 AE |
3486 | *snap_size = le64_to_cpu(size_buf.size); |
3487 | ||
3488 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
57385b51 AE |
3489 | (unsigned long long)snap_id, (unsigned int)*order, |
3490 | (unsigned long long)*snap_size); | |
9d475de5 AE |
3491 | |
3492 | return 0; | |
3493 | } | |
3494 | ||
3495 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3496 | { | |
3497 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3498 | &rbd_dev->header.obj_order, | |
3499 | &rbd_dev->header.image_size); | |
3500 | } | |
3501 | ||
1e130199 AE |
3502 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3503 | { | |
3504 | void *reply_buf; | |
3505 | int ret; | |
3506 | void *p; | |
3507 | ||
3508 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3509 | if (!reply_buf) | |
3510 | return -ENOMEM; | |
3511 | ||
36be9a76 | 3512 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3513 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 3514 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 3515 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3516 | if (ret < 0) |
3517 | goto out; | |
3518 | ||
3519 | p = reply_buf; | |
3520 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3521 | p + ret, NULL, GFP_NOIO); |
3522 | ret = 0; | |
1e130199 AE |
3523 | |
3524 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3525 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3526 | rbd_dev->header.object_prefix = NULL; | |
3527 | } else { | |
3528 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3529 | } | |
1e130199 AE |
3530 | out: |
3531 | kfree(reply_buf); | |
3532 | ||
3533 | return ret; | |
3534 | } | |
3535 | ||
b1b5402a AE |
3536 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3537 | u64 *snap_features) | |
3538 | { | |
3539 | __le64 snapid = cpu_to_le64(snap_id); | |
3540 | struct { | |
3541 | __le64 features; | |
3542 | __le64 incompat; | |
4157976b | 3543 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3544 | u64 incompat; |
b1b5402a AE |
3545 | int ret; |
3546 | ||
36be9a76 | 3547 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3548 | "rbd", "get_features", |
4157976b | 3549 | &snapid, sizeof (snapid), |
e2a58ee5 | 3550 | &features_buf, sizeof (features_buf)); |
36be9a76 | 3551 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3552 | if (ret < 0) |
3553 | return ret; | |
57385b51 AE |
3554 | if (ret < sizeof (features_buf)) |
3555 | return -ERANGE; | |
d889140c AE |
3556 | |
3557 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3558 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3559 | return -ENXIO; |
d889140c | 3560 | |
b1b5402a AE |
3561 | *snap_features = le64_to_cpu(features_buf.features); |
3562 | ||
3563 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
3564 | (unsigned long long)snap_id, |
3565 | (unsigned long long)*snap_features, | |
3566 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
3567 | |
3568 | return 0; | |
3569 | } | |
3570 | ||
3571 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3572 | { | |
3573 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3574 | &rbd_dev->header.features); | |
3575 | } | |
3576 | ||
86b00e0d AE |
3577 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3578 | { | |
3579 | struct rbd_spec *parent_spec; | |
3580 | size_t size; | |
3581 | void *reply_buf = NULL; | |
3582 | __le64 snapid; | |
3583 | void *p; | |
3584 | void *end; | |
3585 | char *image_id; | |
3586 | u64 overlap; | |
86b00e0d AE |
3587 | int ret; |
3588 | ||
3589 | parent_spec = rbd_spec_alloc(); | |
3590 | if (!parent_spec) | |
3591 | return -ENOMEM; | |
3592 | ||
3593 | size = sizeof (__le64) + /* pool_id */ | |
3594 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3595 | sizeof (__le64) + /* snap_id */ | |
3596 | sizeof (__le64); /* overlap */ | |
3597 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3598 | if (!reply_buf) { | |
3599 | ret = -ENOMEM; | |
3600 | goto out_err; | |
3601 | } | |
3602 | ||
3603 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3604 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 3605 | "rbd", "get_parent", |
4157976b | 3606 | &snapid, sizeof (snapid), |
e2a58ee5 | 3607 | reply_buf, size); |
36be9a76 | 3608 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3609 | if (ret < 0) |
3610 | goto out_err; | |
3611 | ||
86b00e0d | 3612 | p = reply_buf; |
57385b51 AE |
3613 | end = reply_buf + ret; |
3614 | ret = -ERANGE; | |
86b00e0d AE |
3615 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
3616 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3617 | goto out; /* No parent? No problem. */ | |
3618 | ||
0903e875 AE |
3619 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3620 | ||
3621 | ret = -EIO; | |
c0cd10db AE |
3622 | if (parent_spec->pool_id > (u64)U32_MAX) { |
3623 | rbd_warn(NULL, "parent pool id too large (%llu > %u)\n", | |
3624 | (unsigned long long)parent_spec->pool_id, U32_MAX); | |
57385b51 | 3625 | goto out_err; |
c0cd10db | 3626 | } |
0903e875 | 3627 | |
979ed480 | 3628 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3629 | if (IS_ERR(image_id)) { |
3630 | ret = PTR_ERR(image_id); | |
3631 | goto out_err; | |
3632 | } | |
3633 | parent_spec->image_id = image_id; | |
3634 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3635 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3636 | ||
3637 | rbd_dev->parent_overlap = overlap; | |
3638 | rbd_dev->parent_spec = parent_spec; | |
3639 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3640 | out: | |
3641 | ret = 0; | |
3642 | out_err: | |
3643 | kfree(reply_buf); | |
3644 | rbd_spec_put(parent_spec); | |
3645 | ||
3646 | return ret; | |
3647 | } | |
3648 | ||
cc070d59 AE |
3649 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
3650 | { | |
3651 | struct { | |
3652 | __le64 stripe_unit; | |
3653 | __le64 stripe_count; | |
3654 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
3655 | size_t size = sizeof (striping_info_buf); | |
3656 | void *p; | |
3657 | u64 obj_size; | |
3658 | u64 stripe_unit; | |
3659 | u64 stripe_count; | |
3660 | int ret; | |
3661 | ||
3662 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
3663 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 3664 | (char *)&striping_info_buf, size); |
cc070d59 AE |
3665 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3666 | if (ret < 0) | |
3667 | return ret; | |
3668 | if (ret < size) | |
3669 | return -ERANGE; | |
3670 | ||
3671 | /* | |
3672 | * We don't actually support the "fancy striping" feature | |
3673 | * (STRIPINGV2) yet, but if the striping sizes are the | |
3674 | * defaults the behavior is the same as before. So find | |
3675 | * out, and only fail if the image has non-default values. | |
3676 | */ | |
3677 | ret = -EINVAL; | |
3678 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
3679 | p = &striping_info_buf; | |
3680 | stripe_unit = ceph_decode_64(&p); | |
3681 | if (stripe_unit != obj_size) { | |
3682 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
3683 | "(got %llu want %llu)", | |
3684 | stripe_unit, obj_size); | |
3685 | return -EINVAL; | |
3686 | } | |
3687 | stripe_count = ceph_decode_64(&p); | |
3688 | if (stripe_count != 1) { | |
3689 | rbd_warn(rbd_dev, "unsupported stripe count " | |
3690 | "(got %llu want 1)", stripe_count); | |
3691 | return -EINVAL; | |
3692 | } | |
500d0c0f AE |
3693 | rbd_dev->header.stripe_unit = stripe_unit; |
3694 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
3695 | |
3696 | return 0; | |
3697 | } | |
3698 | ||
9e15b77d AE |
3699 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3700 | { | |
3701 | size_t image_id_size; | |
3702 | char *image_id; | |
3703 | void *p; | |
3704 | void *end; | |
3705 | size_t size; | |
3706 | void *reply_buf = NULL; | |
3707 | size_t len = 0; | |
3708 | char *image_name = NULL; | |
3709 | int ret; | |
3710 | ||
3711 | rbd_assert(!rbd_dev->spec->image_name); | |
3712 | ||
69e7a02f AE |
3713 | len = strlen(rbd_dev->spec->image_id); |
3714 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3715 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3716 | if (!image_id) | |
3717 | return NULL; | |
3718 | ||
3719 | p = image_id; | |
4157976b | 3720 | end = image_id + image_id_size; |
57385b51 | 3721 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
3722 | |
3723 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3724 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3725 | if (!reply_buf) | |
3726 | goto out; | |
3727 | ||
36be9a76 | 3728 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3729 | "rbd", "dir_get_name", |
3730 | image_id, image_id_size, | |
e2a58ee5 | 3731 | reply_buf, size); |
9e15b77d AE |
3732 | if (ret < 0) |
3733 | goto out; | |
3734 | p = reply_buf; | |
f40eb349 AE |
3735 | end = reply_buf + ret; |
3736 | ||
9e15b77d AE |
3737 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3738 | if (IS_ERR(image_name)) | |
3739 | image_name = NULL; | |
3740 | else | |
3741 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3742 | out: | |
3743 | kfree(reply_buf); | |
3744 | kfree(image_id); | |
3745 | ||
3746 | return image_name; | |
3747 | } | |
3748 | ||
2ad3d716 AE |
3749 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
3750 | { | |
3751 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
3752 | const char *snap_name; | |
3753 | u32 which = 0; | |
3754 | ||
3755 | /* Skip over names until we find the one we are looking for */ | |
3756 | ||
3757 | snap_name = rbd_dev->header.snap_names; | |
3758 | while (which < snapc->num_snaps) { | |
3759 | if (!strcmp(name, snap_name)) | |
3760 | return snapc->snaps[which]; | |
3761 | snap_name += strlen(snap_name) + 1; | |
3762 | which++; | |
3763 | } | |
3764 | return CEPH_NOSNAP; | |
3765 | } | |
3766 | ||
3767 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
3768 | { | |
3769 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
3770 | u32 which; | |
3771 | bool found = false; | |
3772 | u64 snap_id; | |
3773 | ||
3774 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
3775 | const char *snap_name; | |
3776 | ||
3777 | snap_id = snapc->snaps[which]; | |
3778 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
3779 | if (IS_ERR(snap_name)) | |
3780 | break; | |
3781 | found = !strcmp(name, snap_name); | |
3782 | kfree(snap_name); | |
3783 | } | |
3784 | return found ? snap_id : CEPH_NOSNAP; | |
3785 | } | |
3786 | ||
3787 | /* | |
3788 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
3789 | * no snapshot by that name is found, or if an error occurs. | |
3790 | */ | |
3791 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
3792 | { | |
3793 | if (rbd_dev->image_format == 1) | |
3794 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
3795 | ||
3796 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
3797 | } | |
3798 | ||
9e15b77d | 3799 | /* |
2e9f7f1c AE |
3800 | * When an rbd image has a parent image, it is identified by the |
3801 | * pool, image, and snapshot ids (not names). This function fills | |
3802 | * in the names for those ids. (It's OK if we can't figure out the | |
3803 | * name for an image id, but the pool and snapshot ids should always | |
3804 | * exist and have names.) All names in an rbd spec are dynamically | |
3805 | * allocated. | |
e1d4213f AE |
3806 | * |
3807 | * When an image being mapped (not a parent) is probed, we have the | |
3808 | * pool name and pool id, image name and image id, and the snapshot | |
3809 | * name. The only thing we're missing is the snapshot id. | |
9e15b77d | 3810 | */ |
2e9f7f1c | 3811 | static int rbd_dev_spec_update(struct rbd_device *rbd_dev) |
9e15b77d | 3812 | { |
2e9f7f1c AE |
3813 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3814 | struct rbd_spec *spec = rbd_dev->spec; | |
3815 | const char *pool_name; | |
3816 | const char *image_name; | |
3817 | const char *snap_name; | |
9e15b77d AE |
3818 | int ret; |
3819 | ||
e1d4213f AE |
3820 | /* |
3821 | * An image being mapped will have the pool name (etc.), but | |
3822 | * we need to look up the snapshot id. | |
3823 | */ | |
2e9f7f1c AE |
3824 | if (spec->pool_name) { |
3825 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
2ad3d716 | 3826 | u64 snap_id; |
e1d4213f | 3827 | |
2ad3d716 AE |
3828 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
3829 | if (snap_id == CEPH_NOSNAP) | |
e1d4213f | 3830 | return -ENOENT; |
2ad3d716 | 3831 | spec->snap_id = snap_id; |
e1d4213f | 3832 | } else { |
2e9f7f1c | 3833 | spec->snap_id = CEPH_NOSNAP; |
e1d4213f AE |
3834 | } |
3835 | ||
3836 | return 0; | |
3837 | } | |
9e15b77d | 3838 | |
2e9f7f1c | 3839 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 3840 | |
2e9f7f1c AE |
3841 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
3842 | if (!pool_name) { | |
3843 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
3844 | return -EIO; |
3845 | } | |
2e9f7f1c AE |
3846 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
3847 | if (!pool_name) | |
9e15b77d AE |
3848 | return -ENOMEM; |
3849 | ||
3850 | /* Fetch the image name; tolerate failure here */ | |
3851 | ||
2e9f7f1c AE |
3852 | image_name = rbd_dev_image_name(rbd_dev); |
3853 | if (!image_name) | |
06ecc6cb | 3854 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 3855 | |
2e9f7f1c | 3856 | /* Look up the snapshot name, and make a copy */ |
9e15b77d | 3857 | |
2e9f7f1c | 3858 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
2e9f7f1c AE |
3859 | if (!snap_name) { |
3860 | ret = -ENOMEM; | |
9e15b77d | 3861 | goto out_err; |
2e9f7f1c AE |
3862 | } |
3863 | ||
3864 | spec->pool_name = pool_name; | |
3865 | spec->image_name = image_name; | |
3866 | spec->snap_name = snap_name; | |
9e15b77d AE |
3867 | |
3868 | return 0; | |
3869 | out_err: | |
2e9f7f1c AE |
3870 | kfree(image_name); |
3871 | kfree(pool_name); | |
9e15b77d AE |
3872 | |
3873 | return ret; | |
3874 | } | |
3875 | ||
cc4a38bd | 3876 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
3877 | { |
3878 | size_t size; | |
3879 | int ret; | |
3880 | void *reply_buf; | |
3881 | void *p; | |
3882 | void *end; | |
3883 | u64 seq; | |
3884 | u32 snap_count; | |
3885 | struct ceph_snap_context *snapc; | |
3886 | u32 i; | |
3887 | ||
3888 | /* | |
3889 | * We'll need room for the seq value (maximum snapshot id), | |
3890 | * snapshot count, and array of that many snapshot ids. | |
3891 | * For now we have a fixed upper limit on the number we're | |
3892 | * prepared to receive. | |
3893 | */ | |
3894 | size = sizeof (__le64) + sizeof (__le32) + | |
3895 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3896 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3897 | if (!reply_buf) | |
3898 | return -ENOMEM; | |
3899 | ||
36be9a76 | 3900 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3901 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 3902 | reply_buf, size); |
36be9a76 | 3903 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3904 | if (ret < 0) |
3905 | goto out; | |
3906 | ||
35d489f9 | 3907 | p = reply_buf; |
57385b51 AE |
3908 | end = reply_buf + ret; |
3909 | ret = -ERANGE; | |
35d489f9 AE |
3910 | ceph_decode_64_safe(&p, end, seq, out); |
3911 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3912 | ||
3913 | /* | |
3914 | * Make sure the reported number of snapshot ids wouldn't go | |
3915 | * beyond the end of our buffer. But before checking that, | |
3916 | * make sure the computed size of the snapshot context we | |
3917 | * allocate is representable in a size_t. | |
3918 | */ | |
3919 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3920 | / sizeof (u64)) { | |
3921 | ret = -EINVAL; | |
3922 | goto out; | |
3923 | } | |
3924 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3925 | goto out; | |
468521c1 | 3926 | ret = 0; |
35d489f9 | 3927 | |
812164f8 | 3928 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
3929 | if (!snapc) { |
3930 | ret = -ENOMEM; | |
3931 | goto out; | |
3932 | } | |
35d489f9 | 3933 | snapc->seq = seq; |
35d489f9 AE |
3934 | for (i = 0; i < snap_count; i++) |
3935 | snapc->snaps[i] = ceph_decode_64(&p); | |
3936 | ||
3937 | rbd_dev->header.snapc = snapc; | |
3938 | ||
3939 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 3940 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
3941 | out: |
3942 | kfree(reply_buf); | |
3943 | ||
57385b51 | 3944 | return ret; |
35d489f9 AE |
3945 | } |
3946 | ||
54cac61f AE |
3947 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
3948 | u64 snap_id) | |
b8b1e2db AE |
3949 | { |
3950 | size_t size; | |
3951 | void *reply_buf; | |
54cac61f | 3952 | __le64 snapid; |
b8b1e2db AE |
3953 | int ret; |
3954 | void *p; | |
3955 | void *end; | |
b8b1e2db AE |
3956 | char *snap_name; |
3957 | ||
3958 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3959 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3960 | if (!reply_buf) | |
3961 | return ERR_PTR(-ENOMEM); | |
3962 | ||
54cac61f | 3963 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 3964 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 3965 | "rbd", "get_snapshot_name", |
54cac61f | 3966 | &snapid, sizeof (snapid), |
e2a58ee5 | 3967 | reply_buf, size); |
36be9a76 | 3968 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
3969 | if (ret < 0) { |
3970 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 3971 | goto out; |
f40eb349 | 3972 | } |
b8b1e2db AE |
3973 | |
3974 | p = reply_buf; | |
f40eb349 | 3975 | end = reply_buf + ret; |
e5c35534 | 3976 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 3977 | if (IS_ERR(snap_name)) |
b8b1e2db | 3978 | goto out; |
b8b1e2db | 3979 | |
f40eb349 | 3980 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 3981 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
3982 | out: |
3983 | kfree(reply_buf); | |
3984 | ||
f40eb349 | 3985 | return snap_name; |
b8b1e2db AE |
3986 | } |
3987 | ||
cc4a38bd | 3988 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev) |
117973fb AE |
3989 | { |
3990 | int ret; | |
117973fb AE |
3991 | |
3992 | down_write(&rbd_dev->header_rwsem); | |
3993 | ||
117973fb AE |
3994 | ret = rbd_dev_v2_image_size(rbd_dev); |
3995 | if (ret) | |
3996 | goto out; | |
117973fb AE |
3997 | rbd_update_mapping_size(rbd_dev); |
3998 | ||
cc4a38bd | 3999 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb AE |
4000 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
4001 | if (ret) | |
4002 | goto out; | |
117973fb AE |
4003 | out: |
4004 | up_write(&rbd_dev->header_rwsem); | |
4005 | ||
4006 | return ret; | |
4007 | } | |
4008 | ||
dfc5606d YS |
4009 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4010 | { | |
dfc5606d | 4011 | struct device *dev; |
cd789ab9 | 4012 | int ret; |
dfc5606d YS |
4013 | |
4014 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4015 | |
cd789ab9 | 4016 | dev = &rbd_dev->dev; |
dfc5606d YS |
4017 | dev->bus = &rbd_bus_type; |
4018 | dev->type = &rbd_device_type; | |
4019 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4020 | dev->release = rbd_dev_device_release; |
de71a297 | 4021 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4022 | ret = device_register(dev); |
dfc5606d | 4023 | |
dfc5606d | 4024 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4025 | |
dfc5606d | 4026 | return ret; |
602adf40 YS |
4027 | } |
4028 | ||
dfc5606d YS |
4029 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4030 | { | |
4031 | device_unregister(&rbd_dev->dev); | |
4032 | } | |
4033 | ||
e2839308 | 4034 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4035 | |
4036 | /* | |
499afd5b AE |
4037 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4038 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4039 | */ |
e2839308 | 4040 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4041 | { |
e2839308 | 4042 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4043 | |
4044 | spin_lock(&rbd_dev_list_lock); | |
4045 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4046 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4047 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4048 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4049 | } |
b7f23c36 | 4050 | |
1ddbe94e | 4051 | /* |
499afd5b AE |
4052 | * Remove an rbd_dev from the global list, and record that its |
4053 | * identifier is no longer in use. | |
1ddbe94e | 4054 | */ |
e2839308 | 4055 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4056 | { |
d184f6bf | 4057 | struct list_head *tmp; |
de71a297 | 4058 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4059 | int max_id; |
4060 | ||
aafb230e | 4061 | rbd_assert(rbd_id > 0); |
499afd5b | 4062 | |
e2839308 AE |
4063 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4064 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4065 | spin_lock(&rbd_dev_list_lock); |
4066 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4067 | |
4068 | /* | |
4069 | * If the id being "put" is not the current maximum, there | |
4070 | * is nothing special we need to do. | |
4071 | */ | |
e2839308 | 4072 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4073 | spin_unlock(&rbd_dev_list_lock); |
4074 | return; | |
4075 | } | |
4076 | ||
4077 | /* | |
4078 | * We need to update the current maximum id. Search the | |
4079 | * list to find out what it is. We're more likely to find | |
4080 | * the maximum at the end, so search the list backward. | |
4081 | */ | |
4082 | max_id = 0; | |
4083 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4084 | struct rbd_device *rbd_dev; | |
4085 | ||
4086 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4087 | if (rbd_dev->dev_id > max_id) |
4088 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4089 | } |
499afd5b | 4090 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4091 | |
1ddbe94e | 4092 | /* |
e2839308 | 4093 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4094 | * which case it now accurately reflects the new maximum. |
4095 | * Be careful not to overwrite the maximum value in that | |
4096 | * case. | |
1ddbe94e | 4097 | */ |
e2839308 AE |
4098 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4099 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4100 | } |
4101 | ||
e28fff26 AE |
4102 | /* |
4103 | * Skips over white space at *buf, and updates *buf to point to the | |
4104 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4105 | * the token (string of non-white space characters) found. Note |
4106 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4107 | */ |
4108 | static inline size_t next_token(const char **buf) | |
4109 | { | |
4110 | /* | |
4111 | * These are the characters that produce nonzero for | |
4112 | * isspace() in the "C" and "POSIX" locales. | |
4113 | */ | |
4114 | const char *spaces = " \f\n\r\t\v"; | |
4115 | ||
4116 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4117 | ||
4118 | return strcspn(*buf, spaces); /* Return token length */ | |
4119 | } | |
4120 | ||
4121 | /* | |
4122 | * Finds the next token in *buf, and if the provided token buffer is | |
4123 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4124 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4125 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4126 | * |
4127 | * Returns the length of the token found (not including the '\0'). | |
4128 | * Return value will be 0 if no token is found, and it will be >= | |
4129 | * token_size if the token would not fit. | |
4130 | * | |
593a9e7b | 4131 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4132 | * found token. Note that this occurs even if the token buffer is |
4133 | * too small to hold it. | |
4134 | */ | |
4135 | static inline size_t copy_token(const char **buf, | |
4136 | char *token, | |
4137 | size_t token_size) | |
4138 | { | |
4139 | size_t len; | |
4140 | ||
4141 | len = next_token(buf); | |
4142 | if (len < token_size) { | |
4143 | memcpy(token, *buf, len); | |
4144 | *(token + len) = '\0'; | |
4145 | } | |
4146 | *buf += len; | |
4147 | ||
4148 | return len; | |
4149 | } | |
4150 | ||
ea3352f4 AE |
4151 | /* |
4152 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4153 | * enough to hold a copy of it, and copies the token into the new | |
4154 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4155 | * that a duplicate buffer is created even for a zero-length token. | |
4156 | * | |
4157 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4158 | * pointer if memory for the duplicate was not available. If | |
4159 | * the lenp argument is a non-null pointer, the length of the token | |
4160 | * (not including the '\0') is returned in *lenp. | |
4161 | * | |
4162 | * If successful, the *buf pointer will be updated to point beyond | |
4163 | * the end of the found token. | |
4164 | * | |
4165 | * Note: uses GFP_KERNEL for allocation. | |
4166 | */ | |
4167 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4168 | { | |
4169 | char *dup; | |
4170 | size_t len; | |
4171 | ||
4172 | len = next_token(buf); | |
4caf35f9 | 4173 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4174 | if (!dup) |
4175 | return NULL; | |
ea3352f4 AE |
4176 | *(dup + len) = '\0'; |
4177 | *buf += len; | |
4178 | ||
4179 | if (lenp) | |
4180 | *lenp = len; | |
4181 | ||
4182 | return dup; | |
4183 | } | |
4184 | ||
a725f65e | 4185 | /* |
859c31df AE |
4186 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4187 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4188 | * and the data written is passed here via a NUL-terminated buffer. | |
4189 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4190 | * |
859c31df AE |
4191 | * The information extracted from these options is recorded in |
4192 | * the other parameters which return dynamically-allocated | |
4193 | * structures: | |
4194 | * ceph_opts | |
4195 | * The address of a pointer that will refer to a ceph options | |
4196 | * structure. Caller must release the returned pointer using | |
4197 | * ceph_destroy_options() when it is no longer needed. | |
4198 | * rbd_opts | |
4199 | * Address of an rbd options pointer. Fully initialized by | |
4200 | * this function; caller must release with kfree(). | |
4201 | * spec | |
4202 | * Address of an rbd image specification pointer. Fully | |
4203 | * initialized by this function based on parsed options. | |
4204 | * Caller must release with rbd_spec_put(). | |
4205 | * | |
4206 | * The options passed take this form: | |
4207 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4208 | * where: | |
4209 | * <mon_addrs> | |
4210 | * A comma-separated list of one or more monitor addresses. | |
4211 | * A monitor address is an ip address, optionally followed | |
4212 | * by a port number (separated by a colon). | |
4213 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4214 | * <options> | |
4215 | * A comma-separated list of ceph and/or rbd options. | |
4216 | * <pool_name> | |
4217 | * The name of the rados pool containing the rbd image. | |
4218 | * <image_name> | |
4219 | * The name of the image in that pool to map. | |
4220 | * <snap_id> | |
4221 | * An optional snapshot id. If provided, the mapping will | |
4222 | * present data from the image at the time that snapshot was | |
4223 | * created. The image head is used if no snapshot id is | |
4224 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4225 | */ |
859c31df | 4226 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4227 | struct ceph_options **ceph_opts, |
859c31df AE |
4228 | struct rbd_options **opts, |
4229 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4230 | { |
d22f76e7 | 4231 | size_t len; |
859c31df | 4232 | char *options; |
0ddebc0c | 4233 | const char *mon_addrs; |
ecb4dc22 | 4234 | char *snap_name; |
0ddebc0c | 4235 | size_t mon_addrs_size; |
859c31df | 4236 | struct rbd_spec *spec = NULL; |
4e9afeba | 4237 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4238 | struct ceph_options *copts; |
dc79b113 | 4239 | int ret; |
e28fff26 AE |
4240 | |
4241 | /* The first four tokens are required */ | |
4242 | ||
7ef3214a | 4243 | len = next_token(&buf); |
4fb5d671 AE |
4244 | if (!len) { |
4245 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4246 | return -EINVAL; | |
4247 | } | |
0ddebc0c | 4248 | mon_addrs = buf; |
f28e565a | 4249 | mon_addrs_size = len + 1; |
7ef3214a | 4250 | buf += len; |
a725f65e | 4251 | |
dc79b113 | 4252 | ret = -EINVAL; |
f28e565a AE |
4253 | options = dup_token(&buf, NULL); |
4254 | if (!options) | |
dc79b113 | 4255 | return -ENOMEM; |
4fb5d671 AE |
4256 | if (!*options) { |
4257 | rbd_warn(NULL, "no options provided"); | |
4258 | goto out_err; | |
4259 | } | |
e28fff26 | 4260 | |
859c31df AE |
4261 | spec = rbd_spec_alloc(); |
4262 | if (!spec) | |
f28e565a | 4263 | goto out_mem; |
859c31df AE |
4264 | |
4265 | spec->pool_name = dup_token(&buf, NULL); | |
4266 | if (!spec->pool_name) | |
4267 | goto out_mem; | |
4fb5d671 AE |
4268 | if (!*spec->pool_name) { |
4269 | rbd_warn(NULL, "no pool name provided"); | |
4270 | goto out_err; | |
4271 | } | |
e28fff26 | 4272 | |
69e7a02f | 4273 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4274 | if (!spec->image_name) |
f28e565a | 4275 | goto out_mem; |
4fb5d671 AE |
4276 | if (!*spec->image_name) { |
4277 | rbd_warn(NULL, "no image name provided"); | |
4278 | goto out_err; | |
4279 | } | |
d4b125e9 | 4280 | |
f28e565a AE |
4281 | /* |
4282 | * Snapshot name is optional; default is to use "-" | |
4283 | * (indicating the head/no snapshot). | |
4284 | */ | |
3feeb894 | 4285 | len = next_token(&buf); |
820a5f3e | 4286 | if (!len) { |
3feeb894 AE |
4287 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4288 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4289 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4290 | ret = -ENAMETOOLONG; |
f28e565a | 4291 | goto out_err; |
849b4260 | 4292 | } |
ecb4dc22 AE |
4293 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4294 | if (!snap_name) | |
f28e565a | 4295 | goto out_mem; |
ecb4dc22 AE |
4296 | *(snap_name + len) = '\0'; |
4297 | spec->snap_name = snap_name; | |
e5c35534 | 4298 | |
0ddebc0c | 4299 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4300 | |
4e9afeba AE |
4301 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4302 | if (!rbd_opts) | |
4303 | goto out_mem; | |
4304 | ||
4305 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4306 | |
859c31df | 4307 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4308 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4309 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4310 | if (IS_ERR(copts)) { |
4311 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4312 | goto out_err; |
4313 | } | |
859c31df AE |
4314 | kfree(options); |
4315 | ||
4316 | *ceph_opts = copts; | |
4e9afeba | 4317 | *opts = rbd_opts; |
859c31df | 4318 | *rbd_spec = spec; |
0ddebc0c | 4319 | |
dc79b113 | 4320 | return 0; |
f28e565a | 4321 | out_mem: |
dc79b113 | 4322 | ret = -ENOMEM; |
d22f76e7 | 4323 | out_err: |
859c31df AE |
4324 | kfree(rbd_opts); |
4325 | rbd_spec_put(spec); | |
f28e565a | 4326 | kfree(options); |
d22f76e7 | 4327 | |
dc79b113 | 4328 | return ret; |
a725f65e AE |
4329 | } |
4330 | ||
589d30e0 AE |
4331 | /* |
4332 | * An rbd format 2 image has a unique identifier, distinct from the | |
4333 | * name given to it by the user. Internally, that identifier is | |
4334 | * what's used to specify the names of objects related to the image. | |
4335 | * | |
4336 | * A special "rbd id" object is used to map an rbd image name to its | |
4337 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4338 | * with the supplied name. | |
4339 | * | |
4340 | * This function will record the given rbd_dev's image_id field if | |
4341 | * it can be determined, and in that case will return 0. If any | |
4342 | * errors occur a negative errno will be returned and the rbd_dev's | |
4343 | * image_id field will be unchanged (and should be NULL). | |
4344 | */ | |
4345 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4346 | { | |
4347 | int ret; | |
4348 | size_t size; | |
4349 | char *object_name; | |
4350 | void *response; | |
c0fba368 | 4351 | char *image_id; |
2f82ee54 | 4352 | |
2c0d0a10 AE |
4353 | /* |
4354 | * When probing a parent image, the image id is already | |
4355 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4356 | * need to fetch the image id again in this case. We |
4357 | * do still need to set the image format though. | |
2c0d0a10 | 4358 | */ |
c0fba368 AE |
4359 | if (rbd_dev->spec->image_id) { |
4360 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4361 | ||
2c0d0a10 | 4362 | return 0; |
c0fba368 | 4363 | } |
2c0d0a10 | 4364 | |
589d30e0 AE |
4365 | /* |
4366 | * First, see if the format 2 image id file exists, and if | |
4367 | * so, get the image's persistent id from it. | |
4368 | */ | |
69e7a02f | 4369 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4370 | object_name = kmalloc(size, GFP_NOIO); |
4371 | if (!object_name) | |
4372 | return -ENOMEM; | |
0d7dbfce | 4373 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4374 | dout("rbd id object name is %s\n", object_name); |
4375 | ||
4376 | /* Response will be an encoded string, which includes a length */ | |
4377 | ||
4378 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4379 | response = kzalloc(size, GFP_NOIO); | |
4380 | if (!response) { | |
4381 | ret = -ENOMEM; | |
4382 | goto out; | |
4383 | } | |
4384 | ||
c0fba368 AE |
4385 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4386 | ||
36be9a76 | 4387 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4388 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 4389 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 4390 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4391 | if (ret == -ENOENT) { |
4392 | image_id = kstrdup("", GFP_KERNEL); | |
4393 | ret = image_id ? 0 : -ENOMEM; | |
4394 | if (!ret) | |
4395 | rbd_dev->image_format = 1; | |
4396 | } else if (ret > sizeof (__le32)) { | |
4397 | void *p = response; | |
4398 | ||
4399 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4400 | NULL, GFP_NOIO); |
c0fba368 AE |
4401 | ret = IS_ERR(image_id) ? PTR_ERR(image_id) : 0; |
4402 | if (!ret) | |
4403 | rbd_dev->image_format = 2; | |
589d30e0 | 4404 | } else { |
c0fba368 AE |
4405 | ret = -EINVAL; |
4406 | } | |
4407 | ||
4408 | if (!ret) { | |
4409 | rbd_dev->spec->image_id = image_id; | |
4410 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4411 | } |
4412 | out: | |
4413 | kfree(response); | |
4414 | kfree(object_name); | |
4415 | ||
4416 | return ret; | |
4417 | } | |
4418 | ||
6fd48b3b AE |
4419 | /* Undo whatever state changes are made by v1 or v2 image probe */ |
4420 | ||
4421 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) | |
4422 | { | |
4423 | struct rbd_image_header *header; | |
4424 | ||
4425 | rbd_dev_remove_parent(rbd_dev); | |
4426 | rbd_spec_put(rbd_dev->parent_spec); | |
4427 | rbd_dev->parent_spec = NULL; | |
4428 | rbd_dev->parent_overlap = 0; | |
4429 | ||
4430 | /* Free dynamic fields from the header, then zero it out */ | |
4431 | ||
4432 | header = &rbd_dev->header; | |
812164f8 | 4433 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4434 | kfree(header->snap_sizes); |
4435 | kfree(header->snap_names); | |
4436 | kfree(header->object_prefix); | |
4437 | memset(header, 0, sizeof (*header)); | |
4438 | } | |
4439 | ||
a30b71b9 AE |
4440 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4441 | { | |
4442 | int ret; | |
a30b71b9 AE |
4443 | |
4444 | /* Populate rbd image metadata */ | |
4445 | ||
4446 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4447 | if (ret < 0) | |
4448 | goto out_err; | |
86b00e0d AE |
4449 | |
4450 | /* Version 1 images have no parent (no layering) */ | |
4451 | ||
4452 | rbd_dev->parent_spec = NULL; | |
4453 | rbd_dev->parent_overlap = 0; | |
4454 | ||
a30b71b9 AE |
4455 | dout("discovered version 1 image, header name is %s\n", |
4456 | rbd_dev->header_name); | |
4457 | ||
4458 | return 0; | |
4459 | ||
4460 | out_err: | |
4461 | kfree(rbd_dev->header_name); | |
4462 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4463 | kfree(rbd_dev->spec->image_id); |
4464 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4465 | |
4466 | return ret; | |
4467 | } | |
4468 | ||
4469 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4470 | { | |
9d475de5 | 4471 | int ret; |
a30b71b9 | 4472 | |
9d475de5 | 4473 | ret = rbd_dev_v2_image_size(rbd_dev); |
57385b51 | 4474 | if (ret) |
1e130199 AE |
4475 | goto out_err; |
4476 | ||
4477 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4478 | ||
4479 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
57385b51 | 4480 | if (ret) |
b1b5402a AE |
4481 | goto out_err; |
4482 | ||
d889140c | 4483 | /* Get the and check features for the image */ |
b1b5402a AE |
4484 | |
4485 | ret = rbd_dev_v2_features(rbd_dev); | |
57385b51 | 4486 | if (ret) |
9d475de5 | 4487 | goto out_err; |
35d489f9 | 4488 | |
86b00e0d AE |
4489 | /* If the image supports layering, get the parent info */ |
4490 | ||
4491 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4492 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
57385b51 | 4493 | if (ret) |
86b00e0d | 4494 | goto out_err; |
96882f55 AE |
4495 | |
4496 | /* | |
4497 | * Don't print a warning for parent images. We can | |
4498 | * tell this point because we won't know its pool | |
4499 | * name yet (just its pool id). | |
4500 | */ | |
4501 | if (rbd_dev->spec->pool_name) | |
4502 | rbd_warn(rbd_dev, "WARNING: kernel layering " | |
4503 | "is EXPERIMENTAL!"); | |
86b00e0d AE |
4504 | } |
4505 | ||
cc070d59 AE |
4506 | /* If the image supports fancy striping, get its parameters */ |
4507 | ||
4508 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4509 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4510 | if (ret < 0) | |
4511 | goto out_err; | |
4512 | } | |
4513 | ||
6e14b1a6 AE |
4514 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4515 | ||
4516 | rbd_dev->header.crypt_type = 0; | |
4517 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4518 | |
6e14b1a6 AE |
4519 | /* Get the snapshot context, plus the header version */ |
4520 | ||
cc4a38bd | 4521 | ret = rbd_dev_v2_snap_context(rbd_dev); |
35d489f9 AE |
4522 | if (ret) |
4523 | goto out_err; | |
6e14b1a6 | 4524 | |
a30b71b9 AE |
4525 | dout("discovered version 2 image, header name is %s\n", |
4526 | rbd_dev->header_name); | |
4527 | ||
35152979 | 4528 | return 0; |
9d475de5 | 4529 | out_err: |
86b00e0d AE |
4530 | rbd_dev->parent_overlap = 0; |
4531 | rbd_spec_put(rbd_dev->parent_spec); | |
4532 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4533 | kfree(rbd_dev->header_name); |
4534 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4535 | kfree(rbd_dev->header.object_prefix); |
4536 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4537 | |
4538 | return ret; | |
a30b71b9 AE |
4539 | } |
4540 | ||
124afba2 | 4541 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 4542 | { |
2f82ee54 | 4543 | struct rbd_device *parent = NULL; |
124afba2 AE |
4544 | struct rbd_spec *parent_spec; |
4545 | struct rbd_client *rbdc; | |
4546 | int ret; | |
4547 | ||
4548 | if (!rbd_dev->parent_spec) | |
4549 | return 0; | |
4550 | /* | |
4551 | * We need to pass a reference to the client and the parent | |
4552 | * spec when creating the parent rbd_dev. Images related by | |
4553 | * parent/child relationships always share both. | |
4554 | */ | |
4555 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4556 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4557 | ||
4558 | ret = -ENOMEM; | |
4559 | parent = rbd_dev_create(rbdc, parent_spec); | |
4560 | if (!parent) | |
4561 | goto out_err; | |
4562 | ||
4563 | ret = rbd_dev_image_probe(parent); | |
4564 | if (ret < 0) | |
4565 | goto out_err; | |
4566 | rbd_dev->parent = parent; | |
4567 | ||
4568 | return 0; | |
4569 | out_err: | |
4570 | if (parent) { | |
4571 | rbd_spec_put(rbd_dev->parent_spec); | |
4572 | kfree(rbd_dev->header_name); | |
4573 | rbd_dev_destroy(parent); | |
4574 | } else { | |
4575 | rbd_put_client(rbdc); | |
4576 | rbd_spec_put(parent_spec); | |
4577 | } | |
4578 | ||
4579 | return ret; | |
4580 | } | |
4581 | ||
200a6a8b | 4582 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 4583 | { |
83a06263 | 4584 | int ret; |
d1cf5788 AE |
4585 | |
4586 | ret = rbd_dev_mapping_set(rbd_dev); | |
83a06263 | 4587 | if (ret) |
9bb81c9b | 4588 | return ret; |
5de10f3b | 4589 | |
83a06263 AE |
4590 | /* generate unique id: find highest unique id, add one */ |
4591 | rbd_dev_id_get(rbd_dev); | |
4592 | ||
4593 | /* Fill in the device name, now that we have its id. */ | |
4594 | BUILD_BUG_ON(DEV_NAME_LEN | |
4595 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4596 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4597 | ||
4598 | /* Get our block major device number. */ | |
4599 | ||
4600 | ret = register_blkdev(0, rbd_dev->name); | |
4601 | if (ret < 0) | |
4602 | goto err_out_id; | |
4603 | rbd_dev->major = ret; | |
4604 | ||
4605 | /* Set up the blkdev mapping. */ | |
4606 | ||
4607 | ret = rbd_init_disk(rbd_dev); | |
4608 | if (ret) | |
4609 | goto err_out_blkdev; | |
4610 | ||
4611 | ret = rbd_bus_add_dev(rbd_dev); | |
4612 | if (ret) | |
4613 | goto err_out_disk; | |
4614 | ||
83a06263 AE |
4615 | /* Everything's ready. Announce the disk to the world. */ |
4616 | ||
b5156e76 | 4617 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
129b79d4 | 4618 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
4619 | add_disk(rbd_dev->disk); |
4620 | ||
4621 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4622 | (unsigned long long) rbd_dev->mapping.size); | |
4623 | ||
4624 | return ret; | |
2f82ee54 | 4625 | |
83a06263 AE |
4626 | err_out_disk: |
4627 | rbd_free_disk(rbd_dev); | |
4628 | err_out_blkdev: | |
4629 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4630 | err_out_id: | |
4631 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 4632 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
4633 | |
4634 | return ret; | |
4635 | } | |
4636 | ||
332bb12d AE |
4637 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
4638 | { | |
4639 | struct rbd_spec *spec = rbd_dev->spec; | |
4640 | size_t size; | |
4641 | ||
4642 | /* Record the header object name for this rbd image. */ | |
4643 | ||
4644 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4645 | ||
4646 | if (rbd_dev->image_format == 1) | |
4647 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
4648 | else | |
4649 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
4650 | ||
4651 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
4652 | if (!rbd_dev->header_name) | |
4653 | return -ENOMEM; | |
4654 | ||
4655 | if (rbd_dev->image_format == 1) | |
4656 | sprintf(rbd_dev->header_name, "%s%s", | |
4657 | spec->image_name, RBD_SUFFIX); | |
4658 | else | |
4659 | sprintf(rbd_dev->header_name, "%s%s", | |
4660 | RBD_HEADER_PREFIX, spec->image_id); | |
4661 | return 0; | |
4662 | } | |
4663 | ||
200a6a8b AE |
4664 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
4665 | { | |
6fd48b3b AE |
4666 | int ret; |
4667 | ||
6fd48b3b AE |
4668 | rbd_dev_unprobe(rbd_dev); |
4669 | ret = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4670 | if (ret) | |
4671 | rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret); | |
200a6a8b | 4672 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
4673 | rbd_dev->header_name = NULL; |
4674 | rbd_dev->image_format = 0; | |
4675 | kfree(rbd_dev->spec->image_id); | |
4676 | rbd_dev->spec->image_id = NULL; | |
4677 | ||
200a6a8b AE |
4678 | rbd_dev_destroy(rbd_dev); |
4679 | } | |
4680 | ||
a30b71b9 AE |
4681 | /* |
4682 | * Probe for the existence of the header object for the given rbd | |
4683 | * device. For format 2 images this includes determining the image | |
4684 | * id. | |
4685 | */ | |
71f293e2 | 4686 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev) |
a30b71b9 AE |
4687 | { |
4688 | int ret; | |
b644de2b | 4689 | int tmp; |
a30b71b9 AE |
4690 | |
4691 | /* | |
4692 | * Get the id from the image id object. If it's not a | |
4693 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4694 | * it's a format 1 image. | |
4695 | */ | |
4696 | ret = rbd_dev_image_id(rbd_dev); | |
4697 | if (ret) | |
c0fba368 AE |
4698 | return ret; |
4699 | rbd_assert(rbd_dev->spec->image_id); | |
4700 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4701 | ||
332bb12d AE |
4702 | ret = rbd_dev_header_name(rbd_dev); |
4703 | if (ret) | |
4704 | goto err_out_format; | |
4705 | ||
b644de2b AE |
4706 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
4707 | if (ret) | |
4708 | goto out_header_name; | |
4709 | ||
c0fba368 | 4710 | if (rbd_dev->image_format == 1) |
a30b71b9 AE |
4711 | ret = rbd_dev_v1_probe(rbd_dev); |
4712 | else | |
4713 | ret = rbd_dev_v2_probe(rbd_dev); | |
5655c4d9 | 4714 | if (ret) |
b644de2b | 4715 | goto err_out_watch; |
83a06263 | 4716 | |
9bb81c9b AE |
4717 | ret = rbd_dev_spec_update(rbd_dev); |
4718 | if (ret) | |
33dca39f | 4719 | goto err_out_probe; |
9bb81c9b AE |
4720 | |
4721 | ret = rbd_dev_probe_parent(rbd_dev); | |
6fd48b3b AE |
4722 | if (!ret) |
4723 | return 0; | |
83a06263 | 4724 | |
6fd48b3b AE |
4725 | err_out_probe: |
4726 | rbd_dev_unprobe(rbd_dev); | |
b644de2b AE |
4727 | err_out_watch: |
4728 | tmp = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4729 | if (tmp) | |
4730 | rbd_warn(rbd_dev, "unable to tear down watch request\n"); | |
332bb12d AE |
4731 | out_header_name: |
4732 | kfree(rbd_dev->header_name); | |
4733 | rbd_dev->header_name = NULL; | |
4734 | err_out_format: | |
4735 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
4736 | kfree(rbd_dev->spec->image_id); |
4737 | rbd_dev->spec->image_id = NULL; | |
4738 | ||
4739 | dout("probe failed, returning %d\n", ret); | |
4740 | ||
a30b71b9 AE |
4741 | return ret; |
4742 | } | |
4743 | ||
59c2be1e YS |
4744 | static ssize_t rbd_add(struct bus_type *bus, |
4745 | const char *buf, | |
4746 | size_t count) | |
602adf40 | 4747 | { |
cb8627c7 | 4748 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4749 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4750 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4751 | struct rbd_spec *spec = NULL; |
9d3997fd | 4752 | struct rbd_client *rbdc; |
27cc2594 AE |
4753 | struct ceph_osd_client *osdc; |
4754 | int rc = -ENOMEM; | |
602adf40 YS |
4755 | |
4756 | if (!try_module_get(THIS_MODULE)) | |
4757 | return -ENODEV; | |
4758 | ||
602adf40 | 4759 | /* parse add command */ |
859c31df | 4760 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4761 | if (rc < 0) |
bd4ba655 | 4762 | goto err_out_module; |
78cea76e | 4763 | |
9d3997fd AE |
4764 | rbdc = rbd_get_client(ceph_opts); |
4765 | if (IS_ERR(rbdc)) { | |
4766 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4767 | goto err_out_args; |
9d3997fd | 4768 | } |
c53d5893 | 4769 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4770 | |
602adf40 | 4771 | /* pick the pool */ |
9d3997fd | 4772 | osdc = &rbdc->client->osdc; |
859c31df | 4773 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4774 | if (rc < 0) |
4775 | goto err_out_client; | |
c0cd10db | 4776 | spec->pool_id = (u64)rc; |
859c31df | 4777 | |
0903e875 AE |
4778 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4779 | ||
c0cd10db AE |
4780 | if (spec->pool_id > (u64)U32_MAX) { |
4781 | rbd_warn(NULL, "pool id too large (%llu > %u)\n", | |
4782 | (unsigned long long)spec->pool_id, U32_MAX); | |
0903e875 AE |
4783 | rc = -EIO; |
4784 | goto err_out_client; | |
4785 | } | |
4786 | ||
c53d5893 | 4787 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4788 | if (!rbd_dev) |
4789 | goto err_out_client; | |
c53d5893 AE |
4790 | rbdc = NULL; /* rbd_dev now owns this */ |
4791 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4792 | |
bd4ba655 | 4793 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4794 | kfree(rbd_opts); |
4795 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4796 | |
71f293e2 | 4797 | rc = rbd_dev_image_probe(rbd_dev); |
a30b71b9 | 4798 | if (rc < 0) |
c53d5893 | 4799 | goto err_out_rbd_dev; |
05fd6f6f | 4800 | |
b536f69a AE |
4801 | rc = rbd_dev_device_setup(rbd_dev); |
4802 | if (!rc) | |
4803 | return count; | |
4804 | ||
4805 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
4806 | err_out_rbd_dev: |
4807 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4808 | err_out_client: |
9d3997fd | 4809 | rbd_put_client(rbdc); |
0ddebc0c | 4810 | err_out_args: |
78cea76e AE |
4811 | if (ceph_opts) |
4812 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4813 | kfree(rbd_opts); |
859c31df | 4814 | rbd_spec_put(spec); |
bd4ba655 AE |
4815 | err_out_module: |
4816 | module_put(THIS_MODULE); | |
27cc2594 | 4817 | |
602adf40 | 4818 | dout("Error adding device %s\n", buf); |
27cc2594 | 4819 | |
c0cd10db | 4820 | return (ssize_t)rc; |
602adf40 YS |
4821 | } |
4822 | ||
de71a297 | 4823 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4824 | { |
4825 | struct list_head *tmp; | |
4826 | struct rbd_device *rbd_dev; | |
4827 | ||
e124a82f | 4828 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4829 | list_for_each(tmp, &rbd_dev_list) { |
4830 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4831 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4832 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4833 | return rbd_dev; |
e124a82f | 4834 | } |
602adf40 | 4835 | } |
e124a82f | 4836 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4837 | return NULL; |
4838 | } | |
4839 | ||
200a6a8b | 4840 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 4841 | { |
593a9e7b | 4842 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4843 | |
602adf40 | 4844 | rbd_free_disk(rbd_dev); |
200a6a8b AE |
4845 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
4846 | rbd_dev_clear_mapping(rbd_dev); | |
602adf40 | 4847 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
200a6a8b | 4848 | rbd_dev->major = 0; |
e2839308 | 4849 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 4850 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
4851 | } |
4852 | ||
05a46afd AE |
4853 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
4854 | { | |
ad945fc1 | 4855 | while (rbd_dev->parent) { |
05a46afd AE |
4856 | struct rbd_device *first = rbd_dev; |
4857 | struct rbd_device *second = first->parent; | |
4858 | struct rbd_device *third; | |
4859 | ||
4860 | /* | |
4861 | * Follow to the parent with no grandparent and | |
4862 | * remove it. | |
4863 | */ | |
4864 | while (second && (third = second->parent)) { | |
4865 | first = second; | |
4866 | second = third; | |
4867 | } | |
ad945fc1 | 4868 | rbd_assert(second); |
8ad42cd0 | 4869 | rbd_dev_image_release(second); |
ad945fc1 AE |
4870 | first->parent = NULL; |
4871 | first->parent_overlap = 0; | |
4872 | ||
4873 | rbd_assert(first->parent_spec); | |
05a46afd AE |
4874 | rbd_spec_put(first->parent_spec); |
4875 | first->parent_spec = NULL; | |
05a46afd AE |
4876 | } |
4877 | } | |
4878 | ||
dfc5606d YS |
4879 | static ssize_t rbd_remove(struct bus_type *bus, |
4880 | const char *buf, | |
4881 | size_t count) | |
602adf40 YS |
4882 | { |
4883 | struct rbd_device *rbd_dev = NULL; | |
0d8189e1 | 4884 | int target_id; |
602adf40 | 4885 | unsigned long ul; |
0d8189e1 | 4886 | int ret; |
602adf40 | 4887 | |
0d8189e1 AE |
4888 | ret = strict_strtoul(buf, 10, &ul); |
4889 | if (ret) | |
4890 | return ret; | |
602adf40 YS |
4891 | |
4892 | /* convert to int; abort if we lost anything in the conversion */ | |
4893 | target_id = (int) ul; | |
4894 | if (target_id != ul) | |
4895 | return -EINVAL; | |
4896 | ||
4897 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
4898 | ||
4899 | rbd_dev = __rbd_get_dev(target_id); | |
4900 | if (!rbd_dev) { | |
4901 | ret = -ENOENT; | |
4902 | goto done; | |
42382b70 AE |
4903 | } |
4904 | ||
a14ea269 | 4905 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 4906 | if (rbd_dev->open_count) |
42382b70 | 4907 | ret = -EBUSY; |
b82d167b AE |
4908 | else |
4909 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 4910 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 4911 | if (ret < 0) |
42382b70 | 4912 | goto done; |
0d8189e1 | 4913 | ret = count; |
b480815a | 4914 | rbd_bus_del_dev(rbd_dev); |
8ad42cd0 | 4915 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 4916 | module_put(THIS_MODULE); |
602adf40 YS |
4917 | done: |
4918 | mutex_unlock(&ctl_mutex); | |
aafb230e | 4919 | |
602adf40 YS |
4920 | return ret; |
4921 | } | |
4922 | ||
602adf40 YS |
4923 | /* |
4924 | * create control files in sysfs | |
dfc5606d | 4925 | * /sys/bus/rbd/... |
602adf40 YS |
4926 | */ |
4927 | static int rbd_sysfs_init(void) | |
4928 | { | |
dfc5606d | 4929 | int ret; |
602adf40 | 4930 | |
fed4c143 | 4931 | ret = device_register(&rbd_root_dev); |
21079786 | 4932 | if (ret < 0) |
dfc5606d | 4933 | return ret; |
602adf40 | 4934 | |
fed4c143 AE |
4935 | ret = bus_register(&rbd_bus_type); |
4936 | if (ret < 0) | |
4937 | device_unregister(&rbd_root_dev); | |
602adf40 | 4938 | |
602adf40 YS |
4939 | return ret; |
4940 | } | |
4941 | ||
4942 | static void rbd_sysfs_cleanup(void) | |
4943 | { | |
dfc5606d | 4944 | bus_unregister(&rbd_bus_type); |
fed4c143 | 4945 | device_unregister(&rbd_root_dev); |
602adf40 YS |
4946 | } |
4947 | ||
cc344fa1 | 4948 | static int __init rbd_init(void) |
602adf40 YS |
4949 | { |
4950 | int rc; | |
4951 | ||
1e32d34c AE |
4952 | if (!libceph_compatible(NULL)) { |
4953 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
4954 | ||
4955 | return -EINVAL; | |
4956 | } | |
602adf40 YS |
4957 | rc = rbd_sysfs_init(); |
4958 | if (rc) | |
4959 | return rc; | |
f0f8cef5 | 4960 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
4961 | return 0; |
4962 | } | |
4963 | ||
cc344fa1 | 4964 | static void __exit rbd_exit(void) |
602adf40 YS |
4965 | { |
4966 | rbd_sysfs_cleanup(); | |
4967 | } | |
4968 | ||
4969 | module_init(rbd_init); | |
4970 | module_exit(rbd_exit); | |
4971 | ||
4972 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
4973 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
4974 | MODULE_DESCRIPTION("rados block device"); | |
4975 | ||
4976 | /* following authorship retained from original osdblk.c */ | |
4977 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
4978 | ||
4979 | MODULE_LICENSE("GPL"); |