Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
f0f8cef5 AE |
55 | #define RBD_DRV_NAME "rbd" |
56 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
57 | |
58 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
59 | ||
d4b125e9 AE |
60 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
61 | #define RBD_MAX_SNAP_NAME_LEN \ | |
62 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
63 | ||
35d489f9 | 64 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
65 | |
66 | #define RBD_SNAP_HEAD_NAME "-" | |
67 | ||
9e15b77d AE |
68 | /* This allows a single page to hold an image name sent by OSD */ |
69 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 70 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 71 | |
1e130199 | 72 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 73 | |
d889140c AE |
74 | /* Feature bits */ |
75 | ||
5cbf6f12 AE |
76 | #define RBD_FEATURE_LAYERING (1<<0) |
77 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
78 | #define RBD_FEATURES_ALL \ | |
79 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
80 | |
81 | /* Features supported by this (client software) implementation. */ | |
82 | ||
5cbf6f12 | 83 | #define RBD_FEATURES_SUPPORTED (0) |
d889140c | 84 | |
81a89793 AE |
85 | /* |
86 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
87 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
88 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
89 | * enough to hold all possible device names. | |
90 | */ | |
602adf40 | 91 | #define DEV_NAME_LEN 32 |
81a89793 | 92 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
93 | |
94 | /* | |
95 | * block device image metadata (in-memory version) | |
96 | */ | |
97 | struct rbd_image_header { | |
f84344f3 | 98 | /* These four fields never change for a given rbd image */ |
849b4260 | 99 | char *object_prefix; |
34b13184 | 100 | u64 features; |
602adf40 YS |
101 | __u8 obj_order; |
102 | __u8 crypt_type; | |
103 | __u8 comp_type; | |
602adf40 | 104 | |
f84344f3 AE |
105 | /* The remaining fields need to be updated occasionally */ |
106 | u64 image_size; | |
107 | struct ceph_snap_context *snapc; | |
602adf40 YS |
108 | char *snap_names; |
109 | u64 *snap_sizes; | |
59c2be1e YS |
110 | |
111 | u64 obj_version; | |
112 | }; | |
113 | ||
0d7dbfce AE |
114 | /* |
115 | * An rbd image specification. | |
116 | * | |
117 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
118 | * identify an image. Each rbd_dev structure includes a pointer to |
119 | * an rbd_spec structure that encapsulates this identity. | |
120 | * | |
121 | * Each of the id's in an rbd_spec has an associated name. For a | |
122 | * user-mapped image, the names are supplied and the id's associated | |
123 | * with them are looked up. For a layered image, a parent image is | |
124 | * defined by the tuple, and the names are looked up. | |
125 | * | |
126 | * An rbd_dev structure contains a parent_spec pointer which is | |
127 | * non-null if the image it represents is a child in a layered | |
128 | * image. This pointer will refer to the rbd_spec structure used | |
129 | * by the parent rbd_dev for its own identity (i.e., the structure | |
130 | * is shared between the parent and child). | |
131 | * | |
132 | * Since these structures are populated once, during the discovery | |
133 | * phase of image construction, they are effectively immutable so | |
134 | * we make no effort to synchronize access to them. | |
135 | * | |
136 | * Note that code herein does not assume the image name is known (it | |
137 | * could be a null pointer). | |
0d7dbfce AE |
138 | */ |
139 | struct rbd_spec { | |
140 | u64 pool_id; | |
141 | char *pool_name; | |
142 | ||
143 | char *image_id; | |
0d7dbfce | 144 | char *image_name; |
0d7dbfce AE |
145 | |
146 | u64 snap_id; | |
147 | char *snap_name; | |
148 | ||
149 | struct kref kref; | |
150 | }; | |
151 | ||
602adf40 | 152 | /* |
f0f8cef5 | 153 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
154 | */ |
155 | struct rbd_client { | |
156 | struct ceph_client *client; | |
157 | struct kref kref; | |
158 | struct list_head node; | |
159 | }; | |
160 | ||
bf0d5f50 AE |
161 | struct rbd_img_request; |
162 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
163 | ||
164 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
165 | ||
166 | struct rbd_obj_request; | |
167 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
168 | ||
9969ebc5 AE |
169 | enum obj_request_type { |
170 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
171 | }; | |
bf0d5f50 | 172 | |
926f9b3f AE |
173 | enum obj_req_flags { |
174 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 175 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
176 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
177 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
178 | }; |
179 | ||
bf0d5f50 AE |
180 | struct rbd_obj_request { |
181 | const char *object_name; | |
182 | u64 offset; /* object start byte */ | |
183 | u64 length; /* bytes from offset */ | |
926f9b3f | 184 | unsigned long flags; |
bf0d5f50 | 185 | |
c5b5ef6c AE |
186 | /* |
187 | * An object request associated with an image will have its | |
188 | * img_data flag set; a standalone object request will not. | |
189 | * | |
190 | * A standalone object request will have which == BAD_WHICH | |
191 | * and a null obj_request pointer. | |
192 | * | |
193 | * An object request initiated in support of a layered image | |
194 | * object (to check for its existence before a write) will | |
195 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
196 | * | |
197 | * Finally, an object request for rbd image data will have | |
198 | * which != BAD_WHICH, and will have a non-null img_request | |
199 | * pointer. The value of which will be in the range | |
200 | * 0..(img_request->obj_request_count-1). | |
201 | */ | |
202 | union { | |
203 | struct rbd_obj_request *obj_request; /* STAT op */ | |
204 | struct { | |
205 | struct rbd_img_request *img_request; | |
206 | u64 img_offset; | |
207 | /* links for img_request->obj_requests list */ | |
208 | struct list_head links; | |
209 | }; | |
210 | }; | |
bf0d5f50 AE |
211 | u32 which; /* posn image request list */ |
212 | ||
213 | enum obj_request_type type; | |
788e2df3 AE |
214 | union { |
215 | struct bio *bio_list; | |
216 | struct { | |
217 | struct page **pages; | |
218 | u32 page_count; | |
219 | }; | |
220 | }; | |
0eefd470 | 221 | struct page **copyup_pages; |
bf0d5f50 AE |
222 | |
223 | struct ceph_osd_request *osd_req; | |
224 | ||
225 | u64 xferred; /* bytes transferred */ | |
226 | u64 version; | |
1b83bef2 | 227 | int result; |
bf0d5f50 AE |
228 | |
229 | rbd_obj_callback_t callback; | |
788e2df3 | 230 | struct completion completion; |
bf0d5f50 AE |
231 | |
232 | struct kref kref; | |
233 | }; | |
234 | ||
0c425248 | 235 | enum img_req_flags { |
9849e986 AE |
236 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
237 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 238 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
239 | }; |
240 | ||
bf0d5f50 | 241 | struct rbd_img_request { |
bf0d5f50 AE |
242 | struct rbd_device *rbd_dev; |
243 | u64 offset; /* starting image byte offset */ | |
244 | u64 length; /* byte count from offset */ | |
0c425248 | 245 | unsigned long flags; |
bf0d5f50 | 246 | union { |
9849e986 | 247 | u64 snap_id; /* for reads */ |
bf0d5f50 | 248 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
249 | }; |
250 | union { | |
251 | struct request *rq; /* block request */ | |
252 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 253 | }; |
3d7efd18 | 254 | struct page **copyup_pages; |
bf0d5f50 AE |
255 | spinlock_t completion_lock;/* protects next_completion */ |
256 | u32 next_completion; | |
257 | rbd_img_callback_t callback; | |
55f27e09 | 258 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 259 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
260 | |
261 | u32 obj_request_count; | |
262 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
263 | ||
264 | struct kref kref; | |
265 | }; | |
266 | ||
267 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 268 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 269 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 270 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 271 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 272 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 273 | |
dfc5606d YS |
274 | struct rbd_snap { |
275 | struct device dev; | |
276 | const char *name; | |
3591538f | 277 | u64 size; |
dfc5606d YS |
278 | struct list_head node; |
279 | u64 id; | |
34b13184 | 280 | u64 features; |
dfc5606d YS |
281 | }; |
282 | ||
f84344f3 | 283 | struct rbd_mapping { |
99c1f08f | 284 | u64 size; |
34b13184 | 285 | u64 features; |
f84344f3 AE |
286 | bool read_only; |
287 | }; | |
288 | ||
602adf40 YS |
289 | /* |
290 | * a single device | |
291 | */ | |
292 | struct rbd_device { | |
de71a297 | 293 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
294 | |
295 | int major; /* blkdev assigned major */ | |
296 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 297 | |
a30b71b9 | 298 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
299 | struct rbd_client *rbd_client; |
300 | ||
301 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
302 | ||
b82d167b | 303 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
304 | |
305 | struct rbd_image_header header; | |
b82d167b | 306 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 307 | struct rbd_spec *spec; |
602adf40 | 308 | |
0d7dbfce | 309 | char *header_name; |
971f839a | 310 | |
0903e875 AE |
311 | struct ceph_file_layout layout; |
312 | ||
59c2be1e | 313 | struct ceph_osd_event *watch_event; |
975241af | 314 | struct rbd_obj_request *watch_request; |
59c2be1e | 315 | |
86b00e0d AE |
316 | struct rbd_spec *parent_spec; |
317 | u64 parent_overlap; | |
2f82ee54 | 318 | struct rbd_device *parent; |
86b00e0d | 319 | |
c666601a JD |
320 | /* protects updating the header */ |
321 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
322 | |
323 | struct rbd_mapping mapping; | |
602adf40 YS |
324 | |
325 | struct list_head node; | |
dfc5606d YS |
326 | |
327 | /* list of snapshots */ | |
328 | struct list_head snaps; | |
329 | ||
330 | /* sysfs related */ | |
331 | struct device dev; | |
b82d167b | 332 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
333 | }; |
334 | ||
b82d167b AE |
335 | /* |
336 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
337 | * rbd_dev->lock is used to protect access. | |
338 | * | |
339 | * Currently, only the "removing" flag (which is coupled with the | |
340 | * "open_count" field) requires atomic access. | |
341 | */ | |
6d292906 AE |
342 | enum rbd_dev_flags { |
343 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 344 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
345 | }; |
346 | ||
602adf40 | 347 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 348 | |
602adf40 | 349 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
350 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
351 | ||
432b8587 AE |
352 | static LIST_HEAD(rbd_client_list); /* clients */ |
353 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 354 | |
3d7efd18 AE |
355 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
356 | ||
304f6808 AE |
357 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
358 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); | |
359 | ||
dfc5606d | 360 | static void rbd_dev_release(struct device *dev); |
41f38c2b | 361 | static void rbd_remove_snap_dev(struct rbd_snap *snap); |
dfc5606d | 362 | |
f0f8cef5 AE |
363 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
364 | size_t count); | |
365 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
366 | size_t count); | |
2f82ee54 | 367 | static int rbd_dev_probe(struct rbd_device *rbd_dev); |
f0f8cef5 AE |
368 | |
369 | static struct bus_attribute rbd_bus_attrs[] = { | |
370 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
371 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
372 | __ATTR_NULL | |
373 | }; | |
374 | ||
375 | static struct bus_type rbd_bus_type = { | |
376 | .name = "rbd", | |
377 | .bus_attrs = rbd_bus_attrs, | |
378 | }; | |
379 | ||
380 | static void rbd_root_dev_release(struct device *dev) | |
381 | { | |
382 | } | |
383 | ||
384 | static struct device rbd_root_dev = { | |
385 | .init_name = "rbd", | |
386 | .release = rbd_root_dev_release, | |
387 | }; | |
388 | ||
06ecc6cb AE |
389 | static __printf(2, 3) |
390 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
391 | { | |
392 | struct va_format vaf; | |
393 | va_list args; | |
394 | ||
395 | va_start(args, fmt); | |
396 | vaf.fmt = fmt; | |
397 | vaf.va = &args; | |
398 | ||
399 | if (!rbd_dev) | |
400 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
401 | else if (rbd_dev->disk) | |
402 | printk(KERN_WARNING "%s: %s: %pV\n", | |
403 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
404 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
405 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
406 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
407 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
408 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
409 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
410 | else /* punt */ | |
411 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
412 | RBD_DRV_NAME, rbd_dev, &vaf); | |
413 | va_end(args); | |
414 | } | |
415 | ||
aafb230e AE |
416 | #ifdef RBD_DEBUG |
417 | #define rbd_assert(expr) \ | |
418 | if (unlikely(!(expr))) { \ | |
419 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
420 | "at line %d:\n\n" \ | |
421 | "\trbd_assert(%s);\n\n", \ | |
422 | __func__, __LINE__, #expr); \ | |
423 | BUG(); \ | |
424 | } | |
425 | #else /* !RBD_DEBUG */ | |
426 | # define rbd_assert(expr) ((void) 0) | |
427 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 428 | |
8b3e1a56 | 429 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
b454e36d | 430 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
8b3e1a56 | 431 | |
117973fb AE |
432 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
433 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); | |
59c2be1e | 434 | |
602adf40 YS |
435 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
436 | { | |
f0f8cef5 | 437 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 438 | bool removing = false; |
602adf40 | 439 | |
f84344f3 | 440 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
441 | return -EROFS; |
442 | ||
a14ea269 | 443 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
444 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
445 | removing = true; | |
446 | else | |
447 | rbd_dev->open_count++; | |
a14ea269 | 448 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
449 | if (removing) |
450 | return -ENOENT; | |
451 | ||
42382b70 | 452 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 453 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 454 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 455 | mutex_unlock(&ctl_mutex); |
340c7a2b | 456 | |
602adf40 YS |
457 | return 0; |
458 | } | |
459 | ||
dfc5606d YS |
460 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
461 | { | |
462 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
463 | unsigned long open_count_before; |
464 | ||
a14ea269 | 465 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 466 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 467 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 468 | rbd_assert(open_count_before > 0); |
dfc5606d | 469 | |
42382b70 | 470 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 471 | put_device(&rbd_dev->dev); |
42382b70 | 472 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
473 | |
474 | return 0; | |
475 | } | |
476 | ||
602adf40 YS |
477 | static const struct block_device_operations rbd_bd_ops = { |
478 | .owner = THIS_MODULE, | |
479 | .open = rbd_open, | |
dfc5606d | 480 | .release = rbd_release, |
602adf40 YS |
481 | }; |
482 | ||
483 | /* | |
484 | * Initialize an rbd client instance. | |
43ae4701 | 485 | * We own *ceph_opts. |
602adf40 | 486 | */ |
f8c38929 | 487 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
488 | { |
489 | struct rbd_client *rbdc; | |
490 | int ret = -ENOMEM; | |
491 | ||
37206ee5 | 492 | dout("%s:\n", __func__); |
602adf40 YS |
493 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
494 | if (!rbdc) | |
495 | goto out_opt; | |
496 | ||
497 | kref_init(&rbdc->kref); | |
498 | INIT_LIST_HEAD(&rbdc->node); | |
499 | ||
bc534d86 AE |
500 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
501 | ||
43ae4701 | 502 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 503 | if (IS_ERR(rbdc->client)) |
bc534d86 | 504 | goto out_mutex; |
43ae4701 | 505 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
506 | |
507 | ret = ceph_open_session(rbdc->client); | |
508 | if (ret < 0) | |
509 | goto out_err; | |
510 | ||
432b8587 | 511 | spin_lock(&rbd_client_list_lock); |
602adf40 | 512 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 513 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 514 | |
bc534d86 | 515 | mutex_unlock(&ctl_mutex); |
37206ee5 | 516 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 517 | |
602adf40 YS |
518 | return rbdc; |
519 | ||
520 | out_err: | |
521 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
522 | out_mutex: |
523 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
524 | kfree(rbdc); |
525 | out_opt: | |
43ae4701 AE |
526 | if (ceph_opts) |
527 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
528 | dout("%s: error %d\n", __func__, ret); |
529 | ||
28f259b7 | 530 | return ERR_PTR(ret); |
602adf40 YS |
531 | } |
532 | ||
2f82ee54 AE |
533 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
534 | { | |
535 | kref_get(&rbdc->kref); | |
536 | ||
537 | return rbdc; | |
538 | } | |
539 | ||
602adf40 | 540 | /* |
1f7ba331 AE |
541 | * Find a ceph client with specific addr and configuration. If |
542 | * found, bump its reference count. | |
602adf40 | 543 | */ |
1f7ba331 | 544 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
545 | { |
546 | struct rbd_client *client_node; | |
1f7ba331 | 547 | bool found = false; |
602adf40 | 548 | |
43ae4701 | 549 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
550 | return NULL; |
551 | ||
1f7ba331 AE |
552 | spin_lock(&rbd_client_list_lock); |
553 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
554 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
555 | __rbd_get_client(client_node); |
556 | ||
1f7ba331 AE |
557 | found = true; |
558 | break; | |
559 | } | |
560 | } | |
561 | spin_unlock(&rbd_client_list_lock); | |
562 | ||
563 | return found ? client_node : NULL; | |
602adf40 YS |
564 | } |
565 | ||
59c2be1e YS |
566 | /* |
567 | * mount options | |
568 | */ | |
569 | enum { | |
59c2be1e YS |
570 | Opt_last_int, |
571 | /* int args above */ | |
572 | Opt_last_string, | |
573 | /* string args above */ | |
cc0538b6 AE |
574 | Opt_read_only, |
575 | Opt_read_write, | |
576 | /* Boolean args above */ | |
577 | Opt_last_bool, | |
59c2be1e YS |
578 | }; |
579 | ||
43ae4701 | 580 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
581 | /* int args above */ |
582 | /* string args above */ | |
be466c1c | 583 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
584 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
585 | {Opt_read_write, "read_write"}, | |
586 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
587 | /* Boolean args above */ | |
59c2be1e YS |
588 | {-1, NULL} |
589 | }; | |
590 | ||
98571b5a AE |
591 | struct rbd_options { |
592 | bool read_only; | |
593 | }; | |
594 | ||
595 | #define RBD_READ_ONLY_DEFAULT false | |
596 | ||
59c2be1e YS |
597 | static int parse_rbd_opts_token(char *c, void *private) |
598 | { | |
43ae4701 | 599 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
600 | substring_t argstr[MAX_OPT_ARGS]; |
601 | int token, intval, ret; | |
602 | ||
43ae4701 | 603 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
604 | if (token < 0) |
605 | return -EINVAL; | |
606 | ||
607 | if (token < Opt_last_int) { | |
608 | ret = match_int(&argstr[0], &intval); | |
609 | if (ret < 0) { | |
610 | pr_err("bad mount option arg (not int) " | |
611 | "at '%s'\n", c); | |
612 | return ret; | |
613 | } | |
614 | dout("got int token %d val %d\n", token, intval); | |
615 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
616 | dout("got string token %d val %s\n", token, | |
617 | argstr[0].from); | |
cc0538b6 AE |
618 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
619 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
620 | } else { |
621 | dout("got token %d\n", token); | |
622 | } | |
623 | ||
624 | switch (token) { | |
cc0538b6 AE |
625 | case Opt_read_only: |
626 | rbd_opts->read_only = true; | |
627 | break; | |
628 | case Opt_read_write: | |
629 | rbd_opts->read_only = false; | |
630 | break; | |
59c2be1e | 631 | default: |
aafb230e AE |
632 | rbd_assert(false); |
633 | break; | |
59c2be1e YS |
634 | } |
635 | return 0; | |
636 | } | |
637 | ||
602adf40 YS |
638 | /* |
639 | * Get a ceph client with specific addr and configuration, if one does | |
640 | * not exist create it. | |
641 | */ | |
9d3997fd | 642 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 643 | { |
f8c38929 | 644 | struct rbd_client *rbdc; |
59c2be1e | 645 | |
1f7ba331 | 646 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 647 | if (rbdc) /* using an existing client */ |
43ae4701 | 648 | ceph_destroy_options(ceph_opts); |
9d3997fd | 649 | else |
f8c38929 | 650 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 651 | |
9d3997fd | 652 | return rbdc; |
602adf40 YS |
653 | } |
654 | ||
655 | /* | |
656 | * Destroy ceph client | |
d23a4b3f | 657 | * |
432b8587 | 658 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
659 | */ |
660 | static void rbd_client_release(struct kref *kref) | |
661 | { | |
662 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
663 | ||
37206ee5 | 664 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 665 | spin_lock(&rbd_client_list_lock); |
602adf40 | 666 | list_del(&rbdc->node); |
cd9d9f5d | 667 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
668 | |
669 | ceph_destroy_client(rbdc->client); | |
670 | kfree(rbdc); | |
671 | } | |
672 | ||
673 | /* | |
674 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
675 | * it. | |
676 | */ | |
9d3997fd | 677 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 678 | { |
c53d5893 AE |
679 | if (rbdc) |
680 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
681 | } |
682 | ||
a30b71b9 AE |
683 | static bool rbd_image_format_valid(u32 image_format) |
684 | { | |
685 | return image_format == 1 || image_format == 2; | |
686 | } | |
687 | ||
8e94af8e AE |
688 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
689 | { | |
103a150f AE |
690 | size_t size; |
691 | u32 snap_count; | |
692 | ||
693 | /* The header has to start with the magic rbd header text */ | |
694 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
695 | return false; | |
696 | ||
db2388b6 AE |
697 | /* The bio layer requires at least sector-sized I/O */ |
698 | ||
699 | if (ondisk->options.order < SECTOR_SHIFT) | |
700 | return false; | |
701 | ||
702 | /* If we use u64 in a few spots we may be able to loosen this */ | |
703 | ||
704 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
705 | return false; | |
706 | ||
103a150f AE |
707 | /* |
708 | * The size of a snapshot header has to fit in a size_t, and | |
709 | * that limits the number of snapshots. | |
710 | */ | |
711 | snap_count = le32_to_cpu(ondisk->snap_count); | |
712 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
713 | if (snap_count > size / sizeof (__le64)) | |
714 | return false; | |
715 | ||
716 | /* | |
717 | * Not only that, but the size of the entire the snapshot | |
718 | * header must also be representable in a size_t. | |
719 | */ | |
720 | size -= snap_count * sizeof (__le64); | |
721 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
722 | return false; | |
723 | ||
724 | return true; | |
8e94af8e AE |
725 | } |
726 | ||
602adf40 YS |
727 | /* |
728 | * Create a new header structure, translate header format from the on-disk | |
729 | * header. | |
730 | */ | |
731 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 732 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 733 | { |
ccece235 | 734 | u32 snap_count; |
58c17b0e | 735 | size_t len; |
d2bb24e5 | 736 | size_t size; |
621901d6 | 737 | u32 i; |
602adf40 | 738 | |
6a52325f AE |
739 | memset(header, 0, sizeof (*header)); |
740 | ||
103a150f AE |
741 | snap_count = le32_to_cpu(ondisk->snap_count); |
742 | ||
58c17b0e AE |
743 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
744 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 745 | if (!header->object_prefix) |
602adf40 | 746 | return -ENOMEM; |
58c17b0e AE |
747 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
748 | header->object_prefix[len] = '\0'; | |
00f1f36f | 749 | |
602adf40 | 750 | if (snap_count) { |
f785cc1d AE |
751 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
752 | ||
621901d6 AE |
753 | /* Save a copy of the snapshot names */ |
754 | ||
f785cc1d AE |
755 | if (snap_names_len > (u64) SIZE_MAX) |
756 | return -EIO; | |
757 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 758 | if (!header->snap_names) |
6a52325f | 759 | goto out_err; |
f785cc1d AE |
760 | /* |
761 | * Note that rbd_dev_v1_header_read() guarantees | |
762 | * the ondisk buffer we're working with has | |
763 | * snap_names_len bytes beyond the end of the | |
764 | * snapshot id array, this memcpy() is safe. | |
765 | */ | |
766 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
767 | snap_names_len); | |
6a52325f | 768 | |
621901d6 AE |
769 | /* Record each snapshot's size */ |
770 | ||
d2bb24e5 AE |
771 | size = snap_count * sizeof (*header->snap_sizes); |
772 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 773 | if (!header->snap_sizes) |
6a52325f | 774 | goto out_err; |
621901d6 AE |
775 | for (i = 0; i < snap_count; i++) |
776 | header->snap_sizes[i] = | |
777 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 | 778 | } else { |
ccece235 | 779 | WARN_ON(ondisk->snap_names_len); |
602adf40 YS |
780 | header->snap_names = NULL; |
781 | header->snap_sizes = NULL; | |
782 | } | |
849b4260 | 783 | |
34b13184 | 784 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
785 | header->obj_order = ondisk->options.order; |
786 | header->crypt_type = ondisk->options.crypt_type; | |
787 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 788 | |
621901d6 AE |
789 | /* Allocate and fill in the snapshot context */ |
790 | ||
f84344f3 | 791 | header->image_size = le64_to_cpu(ondisk->image_size); |
6a52325f AE |
792 | size = sizeof (struct ceph_snap_context); |
793 | size += snap_count * sizeof (header->snapc->snaps[0]); | |
794 | header->snapc = kzalloc(size, GFP_KERNEL); | |
795 | if (!header->snapc) | |
796 | goto out_err; | |
602adf40 YS |
797 | |
798 | atomic_set(&header->snapc->nref, 1); | |
505cbb9b | 799 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
602adf40 | 800 | header->snapc->num_snaps = snap_count; |
621901d6 AE |
801 | for (i = 0; i < snap_count; i++) |
802 | header->snapc->snaps[i] = | |
803 | le64_to_cpu(ondisk->snaps[i].id); | |
602adf40 YS |
804 | |
805 | return 0; | |
806 | ||
6a52325f | 807 | out_err: |
849b4260 | 808 | kfree(header->snap_sizes); |
ccece235 | 809 | header->snap_sizes = NULL; |
602adf40 | 810 | kfree(header->snap_names); |
ccece235 | 811 | header->snap_names = NULL; |
6a52325f AE |
812 | kfree(header->object_prefix); |
813 | header->object_prefix = NULL; | |
ccece235 | 814 | |
00f1f36f | 815 | return -ENOMEM; |
602adf40 YS |
816 | } |
817 | ||
9e15b77d AE |
818 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
819 | { | |
820 | struct rbd_snap *snap; | |
821 | ||
822 | if (snap_id == CEPH_NOSNAP) | |
823 | return RBD_SNAP_HEAD_NAME; | |
824 | ||
825 | list_for_each_entry(snap, &rbd_dev->snaps, node) | |
826 | if (snap_id == snap->id) | |
827 | return snap->name; | |
828 | ||
829 | return NULL; | |
830 | } | |
831 | ||
8836b995 | 832 | static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
602adf40 | 833 | { |
602adf40 | 834 | |
e86924a8 | 835 | struct rbd_snap *snap; |
602adf40 | 836 | |
e86924a8 AE |
837 | list_for_each_entry(snap, &rbd_dev->snaps, node) { |
838 | if (!strcmp(snap_name, snap->name)) { | |
0d7dbfce | 839 | rbd_dev->spec->snap_id = snap->id; |
e86924a8 | 840 | rbd_dev->mapping.size = snap->size; |
34b13184 | 841 | rbd_dev->mapping.features = snap->features; |
602adf40 | 842 | |
e86924a8 | 843 | return 0; |
00f1f36f | 844 | } |
00f1f36f | 845 | } |
e86924a8 | 846 | |
00f1f36f | 847 | return -ENOENT; |
602adf40 YS |
848 | } |
849 | ||
819d52bf | 850 | static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) |
602adf40 | 851 | { |
78dc447d | 852 | int ret; |
602adf40 | 853 | |
0d7dbfce | 854 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 855 | sizeof (RBD_SNAP_HEAD_NAME))) { |
0d7dbfce | 856 | rbd_dev->spec->snap_id = CEPH_NOSNAP; |
99c1f08f | 857 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 858 | rbd_dev->mapping.features = rbd_dev->header.features; |
e86924a8 | 859 | ret = 0; |
602adf40 | 860 | } else { |
0d7dbfce | 861 | ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); |
602adf40 YS |
862 | if (ret < 0) |
863 | goto done; | |
f84344f3 | 864 | rbd_dev->mapping.read_only = true; |
602adf40 | 865 | } |
6d292906 AE |
866 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
867 | ||
602adf40 | 868 | done: |
602adf40 YS |
869 | return ret; |
870 | } | |
871 | ||
872 | static void rbd_header_free(struct rbd_image_header *header) | |
873 | { | |
849b4260 | 874 | kfree(header->object_prefix); |
d78fd7ae | 875 | header->object_prefix = NULL; |
602adf40 | 876 | kfree(header->snap_sizes); |
d78fd7ae | 877 | header->snap_sizes = NULL; |
849b4260 | 878 | kfree(header->snap_names); |
d78fd7ae | 879 | header->snap_names = NULL; |
d1d25646 | 880 | ceph_put_snap_context(header->snapc); |
d78fd7ae | 881 | header->snapc = NULL; |
602adf40 YS |
882 | } |
883 | ||
98571b5a | 884 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 885 | { |
65ccfe21 AE |
886 | char *name; |
887 | u64 segment; | |
888 | int ret; | |
602adf40 | 889 | |
2fd82b9e | 890 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
891 | if (!name) |
892 | return NULL; | |
893 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 894 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 895 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 896 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
897 | pr_err("error formatting segment name for #%llu (%d)\n", |
898 | segment, ret); | |
899 | kfree(name); | |
900 | name = NULL; | |
901 | } | |
602adf40 | 902 | |
65ccfe21 AE |
903 | return name; |
904 | } | |
602adf40 | 905 | |
65ccfe21 AE |
906 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
907 | { | |
908 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 909 | |
65ccfe21 AE |
910 | return offset & (segment_size - 1); |
911 | } | |
912 | ||
913 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
914 | u64 offset, u64 length) | |
915 | { | |
916 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
917 | ||
918 | offset &= segment_size - 1; | |
919 | ||
aafb230e | 920 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
921 | if (offset + length > segment_size) |
922 | length = segment_size - offset; | |
923 | ||
924 | return length; | |
602adf40 YS |
925 | } |
926 | ||
029bcbd8 JD |
927 | /* |
928 | * returns the size of an object in the image | |
929 | */ | |
930 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
931 | { | |
932 | return 1 << header->obj_order; | |
933 | } | |
934 | ||
602adf40 YS |
935 | /* |
936 | * bio helpers | |
937 | */ | |
938 | ||
939 | static void bio_chain_put(struct bio *chain) | |
940 | { | |
941 | struct bio *tmp; | |
942 | ||
943 | while (chain) { | |
944 | tmp = chain; | |
945 | chain = chain->bi_next; | |
946 | bio_put(tmp); | |
947 | } | |
948 | } | |
949 | ||
950 | /* | |
951 | * zeros a bio chain, starting at specific offset | |
952 | */ | |
953 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
954 | { | |
955 | struct bio_vec *bv; | |
956 | unsigned long flags; | |
957 | void *buf; | |
958 | int i; | |
959 | int pos = 0; | |
960 | ||
961 | while (chain) { | |
962 | bio_for_each_segment(bv, chain, i) { | |
963 | if (pos + bv->bv_len > start_ofs) { | |
964 | int remainder = max(start_ofs - pos, 0); | |
965 | buf = bvec_kmap_irq(bv, &flags); | |
966 | memset(buf + remainder, 0, | |
967 | bv->bv_len - remainder); | |
85b5aaa6 | 968 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
969 | } |
970 | pos += bv->bv_len; | |
971 | } | |
972 | ||
973 | chain = chain->bi_next; | |
974 | } | |
975 | } | |
976 | ||
b9434c5b AE |
977 | /* |
978 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
979 | * starting at the given byte offset from the start of the array and | |
980 | * continuing up to the given end offset. The pages array is | |
981 | * assumed to be big enough to hold all bytes up to the end. | |
982 | */ | |
983 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
984 | { | |
985 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
986 | ||
987 | rbd_assert(end > offset); | |
988 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
989 | while (offset < end) { | |
990 | size_t page_offset; | |
991 | size_t length; | |
992 | unsigned long flags; | |
993 | void *kaddr; | |
994 | ||
995 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
996 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
997 | local_irq_save(flags); | |
998 | kaddr = kmap_atomic(*page); | |
999 | memset(kaddr + page_offset, 0, length); | |
1000 | kunmap_atomic(kaddr); | |
1001 | local_irq_restore(flags); | |
1002 | ||
1003 | offset += length; | |
1004 | page++; | |
1005 | } | |
1006 | } | |
1007 | ||
602adf40 | 1008 | /* |
f7760dad AE |
1009 | * Clone a portion of a bio, starting at the given byte offset |
1010 | * and continuing for the number of bytes indicated. | |
602adf40 | 1011 | */ |
f7760dad AE |
1012 | static struct bio *bio_clone_range(struct bio *bio_src, |
1013 | unsigned int offset, | |
1014 | unsigned int len, | |
1015 | gfp_t gfpmask) | |
602adf40 | 1016 | { |
f7760dad AE |
1017 | struct bio_vec *bv; |
1018 | unsigned int resid; | |
1019 | unsigned short idx; | |
1020 | unsigned int voff; | |
1021 | unsigned short end_idx; | |
1022 | unsigned short vcnt; | |
1023 | struct bio *bio; | |
1024 | ||
1025 | /* Handle the easy case for the caller */ | |
1026 | ||
1027 | if (!offset && len == bio_src->bi_size) | |
1028 | return bio_clone(bio_src, gfpmask); | |
1029 | ||
1030 | if (WARN_ON_ONCE(!len)) | |
1031 | return NULL; | |
1032 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1033 | return NULL; | |
1034 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1035 | return NULL; | |
1036 | ||
1037 | /* Find first affected segment... */ | |
1038 | ||
1039 | resid = offset; | |
1040 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1041 | if (resid < bv->bv_len) | |
1042 | break; | |
1043 | resid -= bv->bv_len; | |
602adf40 | 1044 | } |
f7760dad | 1045 | voff = resid; |
602adf40 | 1046 | |
f7760dad | 1047 | /* ...and the last affected segment */ |
602adf40 | 1048 | |
f7760dad AE |
1049 | resid += len; |
1050 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1051 | if (resid <= bv->bv_len) | |
1052 | break; | |
1053 | resid -= bv->bv_len; | |
1054 | } | |
1055 | vcnt = end_idx - idx + 1; | |
1056 | ||
1057 | /* Build the clone */ | |
1058 | ||
1059 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1060 | if (!bio) | |
1061 | return NULL; /* ENOMEM */ | |
602adf40 | 1062 | |
f7760dad AE |
1063 | bio->bi_bdev = bio_src->bi_bdev; |
1064 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1065 | bio->bi_rw = bio_src->bi_rw; | |
1066 | bio->bi_flags |= 1 << BIO_CLONED; | |
1067 | ||
1068 | /* | |
1069 | * Copy over our part of the bio_vec, then update the first | |
1070 | * and last (or only) entries. | |
1071 | */ | |
1072 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1073 | vcnt * sizeof (struct bio_vec)); | |
1074 | bio->bi_io_vec[0].bv_offset += voff; | |
1075 | if (vcnt > 1) { | |
1076 | bio->bi_io_vec[0].bv_len -= voff; | |
1077 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1078 | } else { | |
1079 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1080 | } |
1081 | ||
f7760dad AE |
1082 | bio->bi_vcnt = vcnt; |
1083 | bio->bi_size = len; | |
1084 | bio->bi_idx = 0; | |
1085 | ||
1086 | return bio; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * Clone a portion of a bio chain, starting at the given byte offset | |
1091 | * into the first bio in the source chain and continuing for the | |
1092 | * number of bytes indicated. The result is another bio chain of | |
1093 | * exactly the given length, or a null pointer on error. | |
1094 | * | |
1095 | * The bio_src and offset parameters are both in-out. On entry they | |
1096 | * refer to the first source bio and the offset into that bio where | |
1097 | * the start of data to be cloned is located. | |
1098 | * | |
1099 | * On return, bio_src is updated to refer to the bio in the source | |
1100 | * chain that contains first un-cloned byte, and *offset will | |
1101 | * contain the offset of that byte within that bio. | |
1102 | */ | |
1103 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1104 | unsigned int *offset, | |
1105 | unsigned int len, | |
1106 | gfp_t gfpmask) | |
1107 | { | |
1108 | struct bio *bi = *bio_src; | |
1109 | unsigned int off = *offset; | |
1110 | struct bio *chain = NULL; | |
1111 | struct bio **end; | |
1112 | ||
1113 | /* Build up a chain of clone bios up to the limit */ | |
1114 | ||
1115 | if (!bi || off >= bi->bi_size || !len) | |
1116 | return NULL; /* Nothing to clone */ | |
602adf40 | 1117 | |
f7760dad AE |
1118 | end = &chain; |
1119 | while (len) { | |
1120 | unsigned int bi_size; | |
1121 | struct bio *bio; | |
1122 | ||
f5400b7a AE |
1123 | if (!bi) { |
1124 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1125 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1126 | } |
f7760dad AE |
1127 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1128 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1129 | if (!bio) | |
1130 | goto out_err; /* ENOMEM */ | |
1131 | ||
1132 | *end = bio; | |
1133 | end = &bio->bi_next; | |
602adf40 | 1134 | |
f7760dad AE |
1135 | off += bi_size; |
1136 | if (off == bi->bi_size) { | |
1137 | bi = bi->bi_next; | |
1138 | off = 0; | |
1139 | } | |
1140 | len -= bi_size; | |
1141 | } | |
1142 | *bio_src = bi; | |
1143 | *offset = off; | |
1144 | ||
1145 | return chain; | |
1146 | out_err: | |
1147 | bio_chain_put(chain); | |
602adf40 | 1148 | |
602adf40 YS |
1149 | return NULL; |
1150 | } | |
1151 | ||
926f9b3f AE |
1152 | /* |
1153 | * The default/initial value for all object request flags is 0. For | |
1154 | * each flag, once its value is set to 1 it is never reset to 0 | |
1155 | * again. | |
1156 | */ | |
57acbaa7 | 1157 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1158 | { |
57acbaa7 | 1159 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1160 | struct rbd_device *rbd_dev; |
1161 | ||
57acbaa7 AE |
1162 | rbd_dev = obj_request->img_request->rbd_dev; |
1163 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1164 | obj_request); |
1165 | } | |
1166 | } | |
1167 | ||
57acbaa7 | 1168 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1169 | { |
1170 | smp_mb(); | |
57acbaa7 | 1171 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1172 | } |
1173 | ||
57acbaa7 | 1174 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1175 | { |
57acbaa7 AE |
1176 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1177 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1178 | |
57acbaa7 AE |
1179 | if (obj_request_img_data_test(obj_request)) |
1180 | rbd_dev = obj_request->img_request->rbd_dev; | |
1181 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1182 | obj_request); |
1183 | } | |
1184 | } | |
1185 | ||
57acbaa7 | 1186 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1187 | { |
1188 | smp_mb(); | |
57acbaa7 | 1189 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1190 | } |
1191 | ||
5679c59f AE |
1192 | /* |
1193 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1194 | * flag. The latter is set based on the "exists" value provided. | |
1195 | * | |
1196 | * Note that for our purposes once an object exists it never goes | |
1197 | * away again. It's possible that the response from two existence | |
1198 | * checks are separated by the creation of the target object, and | |
1199 | * the first ("doesn't exist") response arrives *after* the second | |
1200 | * ("does exist"). In that case we ignore the second one. | |
1201 | */ | |
1202 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1203 | bool exists) | |
1204 | { | |
1205 | if (exists) | |
1206 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1207 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1208 | smp_mb(); | |
1209 | } | |
1210 | ||
1211 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1212 | { | |
1213 | smp_mb(); | |
1214 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1215 | } | |
1216 | ||
1217 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1218 | { | |
1219 | smp_mb(); | |
1220 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1221 | } | |
1222 | ||
bf0d5f50 AE |
1223 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1224 | { | |
37206ee5 AE |
1225 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1226 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1227 | kref_get(&obj_request->kref); |
1228 | } | |
1229 | ||
1230 | static void rbd_obj_request_destroy(struct kref *kref); | |
1231 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1232 | { | |
1233 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1234 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1235 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1236 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1237 | } | |
1238 | ||
1239 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1240 | { | |
37206ee5 AE |
1241 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1242 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1243 | kref_get(&img_request->kref); |
1244 | } | |
1245 | ||
1246 | static void rbd_img_request_destroy(struct kref *kref); | |
1247 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1248 | { | |
1249 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1250 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1251 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1252 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1253 | } | |
1254 | ||
1255 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1256 | struct rbd_obj_request *obj_request) | |
1257 | { | |
25dcf954 AE |
1258 | rbd_assert(obj_request->img_request == NULL); |
1259 | ||
b155e86c | 1260 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1261 | obj_request->img_request = img_request; |
25dcf954 | 1262 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1263 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1264 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1265 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1266 | img_request->obj_request_count++; |
1267 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1268 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1269 | obj_request->which); | |
bf0d5f50 AE |
1270 | } |
1271 | ||
1272 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1273 | struct rbd_obj_request *obj_request) | |
1274 | { | |
1275 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1276 | |
37206ee5 AE |
1277 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1278 | obj_request->which); | |
bf0d5f50 | 1279 | list_del(&obj_request->links); |
25dcf954 AE |
1280 | rbd_assert(img_request->obj_request_count > 0); |
1281 | img_request->obj_request_count--; | |
1282 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1283 | obj_request->which = BAD_WHICH; | |
6365d33a | 1284 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1285 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1286 | obj_request->img_request = NULL; |
25dcf954 | 1287 | obj_request->callback = NULL; |
bf0d5f50 AE |
1288 | rbd_obj_request_put(obj_request); |
1289 | } | |
1290 | ||
1291 | static bool obj_request_type_valid(enum obj_request_type type) | |
1292 | { | |
1293 | switch (type) { | |
9969ebc5 | 1294 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1295 | case OBJ_REQUEST_BIO: |
788e2df3 | 1296 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1297 | return true; |
1298 | default: | |
1299 | return false; | |
1300 | } | |
1301 | } | |
1302 | ||
bf0d5f50 AE |
1303 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1304 | struct rbd_obj_request *obj_request) | |
1305 | { | |
37206ee5 AE |
1306 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1307 | ||
bf0d5f50 AE |
1308 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1309 | } | |
1310 | ||
1311 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1312 | { | |
55f27e09 | 1313 | |
37206ee5 | 1314 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1315 | |
1316 | /* | |
1317 | * If no error occurred, compute the aggregate transfer | |
1318 | * count for the image request. We could instead use | |
1319 | * atomic64_cmpxchg() to update it as each object request | |
1320 | * completes; not clear which way is better off hand. | |
1321 | */ | |
1322 | if (!img_request->result) { | |
1323 | struct rbd_obj_request *obj_request; | |
1324 | u64 xferred = 0; | |
1325 | ||
1326 | for_each_obj_request(img_request, obj_request) | |
1327 | xferred += obj_request->xferred; | |
1328 | img_request->xferred = xferred; | |
1329 | } | |
1330 | ||
bf0d5f50 AE |
1331 | if (img_request->callback) |
1332 | img_request->callback(img_request); | |
1333 | else | |
1334 | rbd_img_request_put(img_request); | |
1335 | } | |
1336 | ||
788e2df3 AE |
1337 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1338 | ||
1339 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1340 | { | |
37206ee5 AE |
1341 | dout("%s: obj %p\n", __func__, obj_request); |
1342 | ||
788e2df3 AE |
1343 | return wait_for_completion_interruptible(&obj_request->completion); |
1344 | } | |
1345 | ||
0c425248 AE |
1346 | /* |
1347 | * The default/initial value for all image request flags is 0. Each | |
1348 | * is conditionally set to 1 at image request initialization time | |
1349 | * and currently never change thereafter. | |
1350 | */ | |
1351 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1352 | { | |
1353 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1354 | smp_mb(); | |
1355 | } | |
1356 | ||
1357 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1358 | { | |
1359 | smp_mb(); | |
1360 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1361 | } | |
1362 | ||
9849e986 AE |
1363 | static void img_request_child_set(struct rbd_img_request *img_request) |
1364 | { | |
1365 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1366 | smp_mb(); | |
1367 | } | |
1368 | ||
1369 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1370 | { | |
1371 | smp_mb(); | |
1372 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1373 | } | |
1374 | ||
d0b2e944 AE |
1375 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1376 | { | |
1377 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1378 | smp_mb(); | |
1379 | } | |
1380 | ||
1381 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1382 | { | |
1383 | smp_mb(); | |
1384 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1385 | } | |
1386 | ||
6e2a4505 AE |
1387 | static void |
1388 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1389 | { | |
b9434c5b AE |
1390 | u64 xferred = obj_request->xferred; |
1391 | u64 length = obj_request->length; | |
1392 | ||
6e2a4505 AE |
1393 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1394 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1395 | xferred, length); |
6e2a4505 AE |
1396 | /* |
1397 | * ENOENT means a hole in the image. We zero-fill the | |
1398 | * entire length of the request. A short read also implies | |
1399 | * zero-fill to the end of the request. Either way we | |
1400 | * update the xferred count to indicate the whole request | |
1401 | * was satisfied. | |
1402 | */ | |
b9434c5b | 1403 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1404 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1405 | if (obj_request->type == OBJ_REQUEST_BIO) |
1406 | zero_bio_chain(obj_request->bio_list, 0); | |
1407 | else | |
1408 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1409 | obj_request->result = 0; |
b9434c5b AE |
1410 | obj_request->xferred = length; |
1411 | } else if (xferred < length && !obj_request->result) { | |
1412 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1413 | zero_bio_chain(obj_request->bio_list, xferred); | |
1414 | else | |
1415 | zero_pages(obj_request->pages, xferred, length); | |
1416 | obj_request->xferred = length; | |
6e2a4505 AE |
1417 | } |
1418 | obj_request_done_set(obj_request); | |
1419 | } | |
1420 | ||
bf0d5f50 AE |
1421 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1422 | { | |
37206ee5 AE |
1423 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1424 | obj_request->callback); | |
bf0d5f50 AE |
1425 | if (obj_request->callback) |
1426 | obj_request->callback(obj_request); | |
788e2df3 AE |
1427 | else |
1428 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1429 | } |
1430 | ||
c47f9371 | 1431 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1432 | { |
1433 | dout("%s: obj %p\n", __func__, obj_request); | |
1434 | obj_request_done_set(obj_request); | |
1435 | } | |
1436 | ||
c47f9371 | 1437 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1438 | { |
57acbaa7 | 1439 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1440 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1441 | bool layered = false; |
1442 | ||
1443 | if (obj_request_img_data_test(obj_request)) { | |
1444 | img_request = obj_request->img_request; | |
1445 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1446 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1447 | } |
8b3e1a56 AE |
1448 | |
1449 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1450 | obj_request, img_request, obj_request->result, | |
1451 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1452 | if (layered && obj_request->result == -ENOENT && |
1453 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1454 | rbd_img_parent_read(obj_request); |
1455 | else if (img_request) | |
6e2a4505 AE |
1456 | rbd_img_obj_request_read_callback(obj_request); |
1457 | else | |
1458 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1459 | } |
1460 | ||
c47f9371 | 1461 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1462 | { |
1b83bef2 SW |
1463 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1464 | obj_request->result, obj_request->length); | |
1465 | /* | |
8b3e1a56 AE |
1466 | * There is no such thing as a successful short write. Set |
1467 | * it to our originally-requested length. | |
1b83bef2 SW |
1468 | */ |
1469 | obj_request->xferred = obj_request->length; | |
07741308 | 1470 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1471 | } |
1472 | ||
fbfab539 AE |
1473 | /* |
1474 | * For a simple stat call there's nothing to do. We'll do more if | |
1475 | * this is part of a write sequence for a layered image. | |
1476 | */ | |
c47f9371 | 1477 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1478 | { |
37206ee5 | 1479 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1480 | obj_request_done_set(obj_request); |
1481 | } | |
1482 | ||
bf0d5f50 AE |
1483 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1484 | struct ceph_msg *msg) | |
1485 | { | |
1486 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1487 | u16 opcode; |
1488 | ||
37206ee5 | 1489 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1490 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1491 | if (obj_request_img_data_test(obj_request)) { |
1492 | rbd_assert(obj_request->img_request); | |
1493 | rbd_assert(obj_request->which != BAD_WHICH); | |
1494 | } else { | |
1495 | rbd_assert(obj_request->which == BAD_WHICH); | |
1496 | } | |
bf0d5f50 | 1497 | |
1b83bef2 SW |
1498 | if (osd_req->r_result < 0) |
1499 | obj_request->result = osd_req->r_result; | |
bf0d5f50 AE |
1500 | obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); |
1501 | ||
0eefd470 | 1502 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1503 | |
c47f9371 AE |
1504 | /* |
1505 | * We support a 64-bit length, but ultimately it has to be | |
1506 | * passed to blk_end_request(), which takes an unsigned int. | |
1507 | */ | |
1b83bef2 | 1508 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1509 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1510 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1511 | switch (opcode) { |
1512 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1513 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1514 | break; |
1515 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1516 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1517 | break; |
fbfab539 | 1518 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1519 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1520 | break; |
36be9a76 | 1521 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1522 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1523 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1524 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1525 | break; |
bf0d5f50 AE |
1526 | default: |
1527 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1528 | obj_request->object_name, (unsigned short) opcode); | |
1529 | break; | |
1530 | } | |
1531 | ||
07741308 | 1532 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1533 | rbd_obj_request_complete(obj_request); |
1534 | } | |
1535 | ||
9d4df01f | 1536 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1537 | { |
1538 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1539 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1540 | u64 snap_id; |
430c28c3 | 1541 | |
8c042b0d | 1542 | rbd_assert(osd_req != NULL); |
430c28c3 | 1543 | |
9d4df01f | 1544 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1545 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1546 | NULL, snap_id, NULL); |
1547 | } | |
1548 | ||
1549 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1550 | { | |
1551 | struct rbd_img_request *img_request = obj_request->img_request; | |
1552 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1553 | struct ceph_snap_context *snapc; | |
1554 | struct timespec mtime = CURRENT_TIME; | |
1555 | ||
1556 | rbd_assert(osd_req != NULL); | |
1557 | ||
1558 | snapc = img_request ? img_request->snapc : NULL; | |
1559 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1560 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1561 | } |
1562 | ||
bf0d5f50 AE |
1563 | static struct ceph_osd_request *rbd_osd_req_create( |
1564 | struct rbd_device *rbd_dev, | |
1565 | bool write_request, | |
430c28c3 | 1566 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1567 | { |
bf0d5f50 AE |
1568 | struct ceph_snap_context *snapc = NULL; |
1569 | struct ceph_osd_client *osdc; | |
1570 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1571 | |
6365d33a AE |
1572 | if (obj_request_img_data_test(obj_request)) { |
1573 | struct rbd_img_request *img_request = obj_request->img_request; | |
1574 | ||
0c425248 AE |
1575 | rbd_assert(write_request == |
1576 | img_request_write_test(img_request)); | |
1577 | if (write_request) | |
bf0d5f50 | 1578 | snapc = img_request->snapc; |
bf0d5f50 AE |
1579 | } |
1580 | ||
1581 | /* Allocate and initialize the request, for the single op */ | |
1582 | ||
1583 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1584 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1585 | if (!osd_req) | |
1586 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1587 | |
430c28c3 | 1588 | if (write_request) |
bf0d5f50 | 1589 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1590 | else |
bf0d5f50 | 1591 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1592 | |
1593 | osd_req->r_callback = rbd_osd_req_callback; | |
1594 | osd_req->r_priv = obj_request; | |
1595 | ||
1596 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1597 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1598 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1599 | ||
1600 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1601 | ||
bf0d5f50 AE |
1602 | return osd_req; |
1603 | } | |
1604 | ||
0eefd470 AE |
1605 | /* |
1606 | * Create a copyup osd request based on the information in the | |
1607 | * object request supplied. A copyup request has two osd ops, | |
1608 | * a copyup method call, and a "normal" write request. | |
1609 | */ | |
1610 | static struct ceph_osd_request * | |
1611 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1612 | { | |
1613 | struct rbd_img_request *img_request; | |
1614 | struct ceph_snap_context *snapc; | |
1615 | struct rbd_device *rbd_dev; | |
1616 | struct ceph_osd_client *osdc; | |
1617 | struct ceph_osd_request *osd_req; | |
1618 | ||
1619 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1620 | img_request = obj_request->img_request; | |
1621 | rbd_assert(img_request); | |
1622 | rbd_assert(img_request_write_test(img_request)); | |
1623 | ||
1624 | /* Allocate and initialize the request, for the two ops */ | |
1625 | ||
1626 | snapc = img_request->snapc; | |
1627 | rbd_dev = img_request->rbd_dev; | |
1628 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1629 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1630 | if (!osd_req) | |
1631 | return NULL; /* ENOMEM */ | |
1632 | ||
1633 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1634 | osd_req->r_callback = rbd_osd_req_callback; | |
1635 | osd_req->r_priv = obj_request; | |
1636 | ||
1637 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1638 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1639 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1640 | ||
1641 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1642 | ||
1643 | return osd_req; | |
1644 | } | |
1645 | ||
1646 | ||
bf0d5f50 AE |
1647 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1648 | { | |
1649 | ceph_osdc_put_request(osd_req); | |
1650 | } | |
1651 | ||
1652 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1653 | ||
1654 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1655 | u64 offset, u64 length, | |
1656 | enum obj_request_type type) | |
1657 | { | |
1658 | struct rbd_obj_request *obj_request; | |
1659 | size_t size; | |
1660 | char *name; | |
1661 | ||
1662 | rbd_assert(obj_request_type_valid(type)); | |
1663 | ||
1664 | size = strlen(object_name) + 1; | |
1665 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1666 | if (!obj_request) | |
1667 | return NULL; | |
1668 | ||
1669 | name = (char *)(obj_request + 1); | |
1670 | obj_request->object_name = memcpy(name, object_name, size); | |
1671 | obj_request->offset = offset; | |
1672 | obj_request->length = length; | |
926f9b3f | 1673 | obj_request->flags = 0; |
bf0d5f50 AE |
1674 | obj_request->which = BAD_WHICH; |
1675 | obj_request->type = type; | |
1676 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1677 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1678 | kref_init(&obj_request->kref); |
1679 | ||
37206ee5 AE |
1680 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1681 | offset, length, (int)type, obj_request); | |
1682 | ||
bf0d5f50 AE |
1683 | return obj_request; |
1684 | } | |
1685 | ||
1686 | static void rbd_obj_request_destroy(struct kref *kref) | |
1687 | { | |
1688 | struct rbd_obj_request *obj_request; | |
1689 | ||
1690 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1691 | ||
37206ee5 AE |
1692 | dout("%s: obj %p\n", __func__, obj_request); |
1693 | ||
bf0d5f50 AE |
1694 | rbd_assert(obj_request->img_request == NULL); |
1695 | rbd_assert(obj_request->which == BAD_WHICH); | |
1696 | ||
1697 | if (obj_request->osd_req) | |
1698 | rbd_osd_req_destroy(obj_request->osd_req); | |
1699 | ||
1700 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1701 | switch (obj_request->type) { | |
9969ebc5 AE |
1702 | case OBJ_REQUEST_NODATA: |
1703 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1704 | case OBJ_REQUEST_BIO: |
1705 | if (obj_request->bio_list) | |
1706 | bio_chain_put(obj_request->bio_list); | |
1707 | break; | |
788e2df3 AE |
1708 | case OBJ_REQUEST_PAGES: |
1709 | if (obj_request->pages) | |
1710 | ceph_release_page_vector(obj_request->pages, | |
1711 | obj_request->page_count); | |
1712 | break; | |
bf0d5f50 AE |
1713 | } |
1714 | ||
1715 | kfree(obj_request); | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Caller is responsible for filling in the list of object requests | |
1720 | * that comprises the image request, and the Linux request pointer | |
1721 | * (if there is one). | |
1722 | */ | |
cc344fa1 AE |
1723 | static struct rbd_img_request *rbd_img_request_create( |
1724 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1725 | u64 offset, u64 length, |
9849e986 AE |
1726 | bool write_request, |
1727 | bool child_request) | |
bf0d5f50 AE |
1728 | { |
1729 | struct rbd_img_request *img_request; | |
1730 | struct ceph_snap_context *snapc = NULL; | |
1731 | ||
1732 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1733 | if (!img_request) | |
1734 | return NULL; | |
1735 | ||
1736 | if (write_request) { | |
1737 | down_read(&rbd_dev->header_rwsem); | |
1738 | snapc = ceph_get_snap_context(rbd_dev->header.snapc); | |
1739 | up_read(&rbd_dev->header_rwsem); | |
1740 | if (WARN_ON(!snapc)) { | |
1741 | kfree(img_request); | |
1742 | return NULL; /* Shouldn't happen */ | |
1743 | } | |
0c425248 | 1744 | |
bf0d5f50 AE |
1745 | } |
1746 | ||
1747 | img_request->rq = NULL; | |
1748 | img_request->rbd_dev = rbd_dev; | |
1749 | img_request->offset = offset; | |
1750 | img_request->length = length; | |
0c425248 AE |
1751 | img_request->flags = 0; |
1752 | if (write_request) { | |
1753 | img_request_write_set(img_request); | |
bf0d5f50 | 1754 | img_request->snapc = snapc; |
0c425248 | 1755 | } else { |
bf0d5f50 | 1756 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1757 | } |
9849e986 AE |
1758 | if (child_request) |
1759 | img_request_child_set(img_request); | |
d0b2e944 AE |
1760 | if (rbd_dev->parent_spec) |
1761 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1762 | spin_lock_init(&img_request->completion_lock); |
1763 | img_request->next_completion = 0; | |
1764 | img_request->callback = NULL; | |
a5a337d4 | 1765 | img_request->result = 0; |
bf0d5f50 AE |
1766 | img_request->obj_request_count = 0; |
1767 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1768 | kref_init(&img_request->kref); | |
1769 | ||
1770 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1771 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1772 | ||
37206ee5 AE |
1773 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1774 | write_request ? "write" : "read", offset, length, | |
1775 | img_request); | |
1776 | ||
bf0d5f50 AE |
1777 | return img_request; |
1778 | } | |
1779 | ||
1780 | static void rbd_img_request_destroy(struct kref *kref) | |
1781 | { | |
1782 | struct rbd_img_request *img_request; | |
1783 | struct rbd_obj_request *obj_request; | |
1784 | struct rbd_obj_request *next_obj_request; | |
1785 | ||
1786 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1787 | ||
37206ee5 AE |
1788 | dout("%s: img %p\n", __func__, img_request); |
1789 | ||
bf0d5f50 AE |
1790 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1791 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1792 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1793 | |
0c425248 | 1794 | if (img_request_write_test(img_request)) |
bf0d5f50 AE |
1795 | ceph_put_snap_context(img_request->snapc); |
1796 | ||
8b3e1a56 AE |
1797 | if (img_request_child_test(img_request)) |
1798 | rbd_obj_request_put(img_request->obj_request); | |
1799 | ||
bf0d5f50 AE |
1800 | kfree(img_request); |
1801 | } | |
1802 | ||
1217857f AE |
1803 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1804 | { | |
6365d33a | 1805 | struct rbd_img_request *img_request; |
1217857f AE |
1806 | unsigned int xferred; |
1807 | int result; | |
8b3e1a56 | 1808 | bool more; |
1217857f | 1809 | |
6365d33a AE |
1810 | rbd_assert(obj_request_img_data_test(obj_request)); |
1811 | img_request = obj_request->img_request; | |
1812 | ||
1217857f AE |
1813 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1814 | xferred = (unsigned int)obj_request->xferred; | |
1815 | result = obj_request->result; | |
1816 | if (result) { | |
1817 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1818 | ||
1819 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1820 | img_request_write_test(img_request) ? "write" : "read", | |
1821 | obj_request->length, obj_request->img_offset, | |
1822 | obj_request->offset); | |
1823 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1824 | result, xferred); | |
1825 | if (!img_request->result) | |
1826 | img_request->result = result; | |
1827 | } | |
1828 | ||
f1a4739f AE |
1829 | /* Image object requests don't own their page array */ |
1830 | ||
1831 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1832 | obj_request->pages = NULL; | |
1833 | obj_request->page_count = 0; | |
1834 | } | |
1835 | ||
8b3e1a56 AE |
1836 | if (img_request_child_test(img_request)) { |
1837 | rbd_assert(img_request->obj_request != NULL); | |
1838 | more = obj_request->which < img_request->obj_request_count - 1; | |
1839 | } else { | |
1840 | rbd_assert(img_request->rq != NULL); | |
1841 | more = blk_end_request(img_request->rq, result, xferred); | |
1842 | } | |
1843 | ||
1844 | return more; | |
1217857f AE |
1845 | } |
1846 | ||
2169238d AE |
1847 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1848 | { | |
1849 | struct rbd_img_request *img_request; | |
1850 | u32 which = obj_request->which; | |
1851 | bool more = true; | |
1852 | ||
6365d33a | 1853 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1854 | img_request = obj_request->img_request; |
1855 | ||
1856 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1857 | rbd_assert(img_request != NULL); | |
2169238d AE |
1858 | rbd_assert(img_request->obj_request_count > 0); |
1859 | rbd_assert(which != BAD_WHICH); | |
1860 | rbd_assert(which < img_request->obj_request_count); | |
1861 | rbd_assert(which >= img_request->next_completion); | |
1862 | ||
1863 | spin_lock_irq(&img_request->completion_lock); | |
1864 | if (which != img_request->next_completion) | |
1865 | goto out; | |
1866 | ||
1867 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1868 | rbd_assert(more); |
1869 | rbd_assert(which < img_request->obj_request_count); | |
1870 | ||
1871 | if (!obj_request_done_test(obj_request)) | |
1872 | break; | |
1217857f | 1873 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1874 | which++; |
1875 | } | |
1876 | ||
1877 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1878 | img_request->next_completion = which; | |
1879 | out: | |
1880 | spin_unlock_irq(&img_request->completion_lock); | |
1881 | ||
1882 | if (!more) | |
1883 | rbd_img_request_complete(img_request); | |
1884 | } | |
1885 | ||
f1a4739f AE |
1886 | /* |
1887 | * Split up an image request into one or more object requests, each | |
1888 | * to a different object. The "type" parameter indicates whether | |
1889 | * "data_desc" is the pointer to the head of a list of bio | |
1890 | * structures, or the base of a page array. In either case this | |
1891 | * function assumes data_desc describes memory sufficient to hold | |
1892 | * all data described by the image request. | |
1893 | */ | |
1894 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1895 | enum obj_request_type type, | |
1896 | void *data_desc) | |
bf0d5f50 AE |
1897 | { |
1898 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1899 | struct rbd_obj_request *obj_request = NULL; | |
1900 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1901 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1902 | struct bio *bio_list; |
1903 | unsigned int bio_offset = 0; | |
1904 | struct page **pages; | |
7da22d29 | 1905 | u64 img_offset; |
bf0d5f50 AE |
1906 | u64 resid; |
1907 | u16 opcode; | |
1908 | ||
f1a4739f AE |
1909 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1910 | (int)type, data_desc); | |
37206ee5 | 1911 | |
430c28c3 | 1912 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1913 | img_offset = img_request->offset; |
bf0d5f50 | 1914 | resid = img_request->length; |
4dda41d3 | 1915 | rbd_assert(resid > 0); |
f1a4739f AE |
1916 | |
1917 | if (type == OBJ_REQUEST_BIO) { | |
1918 | bio_list = data_desc; | |
1919 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1920 | } else { | |
1921 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
1922 | pages = data_desc; | |
1923 | } | |
1924 | ||
bf0d5f50 | 1925 | while (resid) { |
2fa12320 | 1926 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 1927 | const char *object_name; |
bf0d5f50 AE |
1928 | u64 offset; |
1929 | u64 length; | |
1930 | ||
7da22d29 | 1931 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
1932 | if (!object_name) |
1933 | goto out_unwind; | |
7da22d29 AE |
1934 | offset = rbd_segment_offset(rbd_dev, img_offset); |
1935 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 1936 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 1937 | offset, length, type); |
bf0d5f50 AE |
1938 | kfree(object_name); /* object request has its own copy */ |
1939 | if (!obj_request) | |
1940 | goto out_unwind; | |
1941 | ||
f1a4739f AE |
1942 | if (type == OBJ_REQUEST_BIO) { |
1943 | unsigned int clone_size; | |
1944 | ||
1945 | rbd_assert(length <= (u64)UINT_MAX); | |
1946 | clone_size = (unsigned int)length; | |
1947 | obj_request->bio_list = | |
1948 | bio_chain_clone_range(&bio_list, | |
1949 | &bio_offset, | |
1950 | clone_size, | |
1951 | GFP_ATOMIC); | |
1952 | if (!obj_request->bio_list) | |
1953 | goto out_partial; | |
1954 | } else { | |
1955 | unsigned int page_count; | |
1956 | ||
1957 | obj_request->pages = pages; | |
1958 | page_count = (u32)calc_pages_for(offset, length); | |
1959 | obj_request->page_count = page_count; | |
1960 | if ((offset + length) & ~PAGE_MASK) | |
1961 | page_count--; /* more on last page */ | |
1962 | pages += page_count; | |
1963 | } | |
bf0d5f50 | 1964 | |
2fa12320 AE |
1965 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
1966 | obj_request); | |
1967 | if (!osd_req) | |
bf0d5f50 | 1968 | goto out_partial; |
2fa12320 | 1969 | obj_request->osd_req = osd_req; |
2169238d | 1970 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 1971 | |
2fa12320 AE |
1972 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
1973 | 0, 0); | |
f1a4739f AE |
1974 | if (type == OBJ_REQUEST_BIO) |
1975 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
1976 | obj_request->bio_list, length); | |
1977 | else | |
1978 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
1979 | obj_request->pages, length, | |
1980 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
1981 | |
1982 | if (write_request) | |
1983 | rbd_osd_req_format_write(obj_request); | |
1984 | else | |
1985 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 1986 | |
7da22d29 | 1987 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
1988 | rbd_img_obj_request_add(img_request, obj_request); |
1989 | ||
7da22d29 | 1990 | img_offset += length; |
bf0d5f50 AE |
1991 | resid -= length; |
1992 | } | |
1993 | ||
1994 | return 0; | |
1995 | ||
1996 | out_partial: | |
1997 | rbd_obj_request_put(obj_request); | |
1998 | out_unwind: | |
1999 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
2000 | rbd_obj_request_put(obj_request); | |
2001 | ||
2002 | return -ENOMEM; | |
2003 | } | |
2004 | ||
0eefd470 AE |
2005 | static void |
2006 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2007 | { | |
2008 | struct rbd_img_request *img_request; | |
2009 | struct rbd_device *rbd_dev; | |
2010 | u64 length; | |
2011 | u32 page_count; | |
2012 | ||
2013 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2014 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2015 | img_request = obj_request->img_request; | |
2016 | rbd_assert(img_request); | |
2017 | ||
2018 | rbd_dev = img_request->rbd_dev; | |
2019 | rbd_assert(rbd_dev); | |
2020 | length = (u64)1 << rbd_dev->header.obj_order; | |
2021 | page_count = (u32)calc_pages_for(0, length); | |
2022 | ||
2023 | rbd_assert(obj_request->copyup_pages); | |
2024 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2025 | obj_request->copyup_pages = NULL; | |
2026 | ||
2027 | /* | |
2028 | * We want the transfer count to reflect the size of the | |
2029 | * original write request. There is no such thing as a | |
2030 | * successful short write, so if the request was successful | |
2031 | * we can just set it to the originally-requested length. | |
2032 | */ | |
2033 | if (!obj_request->result) | |
2034 | obj_request->xferred = obj_request->length; | |
2035 | ||
2036 | /* Finish up with the normal image object callback */ | |
2037 | ||
2038 | rbd_img_obj_callback(obj_request); | |
2039 | } | |
2040 | ||
3d7efd18 AE |
2041 | static void |
2042 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2043 | { | |
2044 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2045 | struct ceph_osd_request *osd_req; |
2046 | struct ceph_osd_client *osdc; | |
2047 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2048 | struct page **pages; |
3d7efd18 AE |
2049 | int result; |
2050 | u64 obj_size; | |
2051 | u64 xferred; | |
2052 | ||
2053 | rbd_assert(img_request_child_test(img_request)); | |
2054 | ||
2055 | /* First get what we need from the image request */ | |
2056 | ||
2057 | pages = img_request->copyup_pages; | |
2058 | rbd_assert(pages != NULL); | |
2059 | img_request->copyup_pages = NULL; | |
2060 | ||
2061 | orig_request = img_request->obj_request; | |
2062 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2063 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2064 | result = img_request->result; |
2065 | obj_size = img_request->length; | |
2066 | xferred = img_request->xferred; | |
2067 | ||
0eefd470 AE |
2068 | rbd_dev = img_request->rbd_dev; |
2069 | rbd_assert(rbd_dev); | |
2070 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2071 | ||
3d7efd18 AE |
2072 | rbd_img_request_put(img_request); |
2073 | ||
0eefd470 AE |
2074 | if (result) |
2075 | goto out_err; | |
2076 | ||
2077 | /* Allocate the new copyup osd request for the original request */ | |
2078 | ||
2079 | result = -ENOMEM; | |
2080 | rbd_assert(!orig_request->osd_req); | |
2081 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2082 | if (!osd_req) | |
2083 | goto out_err; | |
2084 | orig_request->osd_req = osd_req; | |
2085 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2086 | |
0eefd470 | 2087 | /* Initialize the copyup op */ |
3d7efd18 | 2088 | |
0eefd470 AE |
2089 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2090 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2091 | false, false); | |
3d7efd18 | 2092 | |
0eefd470 AE |
2093 | /* Then the original write request op */ |
2094 | ||
2095 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2096 | orig_request->offset, | |
2097 | orig_request->length, 0, 0); | |
2098 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2099 | orig_request->length); | |
2100 | ||
2101 | rbd_osd_req_format_write(orig_request); | |
2102 | ||
2103 | /* All set, send it off. */ | |
2104 | ||
2105 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2106 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2107 | result = rbd_obj_request_submit(osdc, orig_request); | |
2108 | if (!result) | |
2109 | return; | |
2110 | out_err: | |
2111 | /* Record the error code and complete the request */ | |
2112 | ||
2113 | orig_request->result = result; | |
2114 | orig_request->xferred = 0; | |
2115 | obj_request_done_set(orig_request); | |
2116 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2117 | } |
2118 | ||
2119 | /* | |
2120 | * Read from the parent image the range of data that covers the | |
2121 | * entire target of the given object request. This is used for | |
2122 | * satisfying a layered image write request when the target of an | |
2123 | * object request from the image request does not exist. | |
2124 | * | |
2125 | * A page array big enough to hold the returned data is allocated | |
2126 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2127 | * When the read completes, this page array will be transferred to | |
2128 | * the original object request for the copyup operation. | |
2129 | * | |
2130 | * If an error occurs, record it as the result of the original | |
2131 | * object request and mark it done so it gets completed. | |
2132 | */ | |
2133 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2134 | { | |
2135 | struct rbd_img_request *img_request = NULL; | |
2136 | struct rbd_img_request *parent_request = NULL; | |
2137 | struct rbd_device *rbd_dev; | |
2138 | u64 img_offset; | |
2139 | u64 length; | |
2140 | struct page **pages = NULL; | |
2141 | u32 page_count; | |
2142 | int result; | |
2143 | ||
2144 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2145 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2146 | ||
2147 | img_request = obj_request->img_request; | |
2148 | rbd_assert(img_request != NULL); | |
2149 | rbd_dev = img_request->rbd_dev; | |
2150 | rbd_assert(rbd_dev->parent != NULL); | |
2151 | ||
0eefd470 AE |
2152 | /* |
2153 | * First things first. The original osd request is of no | |
2154 | * use to use any more, we'll need a new one that can hold | |
2155 | * the two ops in a copyup request. We'll get that later, | |
2156 | * but for now we can release the old one. | |
2157 | */ | |
2158 | rbd_osd_req_destroy(obj_request->osd_req); | |
2159 | obj_request->osd_req = NULL; | |
2160 | ||
3d7efd18 AE |
2161 | /* |
2162 | * Determine the byte range covered by the object in the | |
2163 | * child image to which the original request was to be sent. | |
2164 | */ | |
2165 | img_offset = obj_request->img_offset - obj_request->offset; | |
2166 | length = (u64)1 << rbd_dev->header.obj_order; | |
2167 | ||
a9e8ba2c AE |
2168 | /* |
2169 | * There is no defined parent data beyond the parent | |
2170 | * overlap, so limit what we read at that boundary if | |
2171 | * necessary. | |
2172 | */ | |
2173 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2174 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2175 | length = rbd_dev->parent_overlap - img_offset; | |
2176 | } | |
2177 | ||
3d7efd18 AE |
2178 | /* |
2179 | * Allocate a page array big enough to receive the data read | |
2180 | * from the parent. | |
2181 | */ | |
2182 | page_count = (u32)calc_pages_for(0, length); | |
2183 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2184 | if (IS_ERR(pages)) { | |
2185 | result = PTR_ERR(pages); | |
2186 | pages = NULL; | |
2187 | goto out_err; | |
2188 | } | |
2189 | ||
2190 | result = -ENOMEM; | |
2191 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2192 | img_offset, length, | |
2193 | false, true); | |
2194 | if (!parent_request) | |
2195 | goto out_err; | |
2196 | rbd_obj_request_get(obj_request); | |
2197 | parent_request->obj_request = obj_request; | |
2198 | ||
2199 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2200 | if (result) | |
2201 | goto out_err; | |
2202 | parent_request->copyup_pages = pages; | |
2203 | ||
2204 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2205 | result = rbd_img_request_submit(parent_request); | |
2206 | if (!result) | |
2207 | return 0; | |
2208 | ||
2209 | parent_request->copyup_pages = NULL; | |
2210 | parent_request->obj_request = NULL; | |
2211 | rbd_obj_request_put(obj_request); | |
2212 | out_err: | |
2213 | if (pages) | |
2214 | ceph_release_page_vector(pages, page_count); | |
2215 | if (parent_request) | |
2216 | rbd_img_request_put(parent_request); | |
2217 | obj_request->result = result; | |
2218 | obj_request->xferred = 0; | |
2219 | obj_request_done_set(obj_request); | |
2220 | ||
2221 | return result; | |
2222 | } | |
2223 | ||
c5b5ef6c AE |
2224 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2225 | { | |
c5b5ef6c AE |
2226 | struct rbd_obj_request *orig_request; |
2227 | int result; | |
2228 | ||
2229 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2230 | ||
2231 | /* | |
2232 | * All we need from the object request is the original | |
2233 | * request and the result of the STAT op. Grab those, then | |
2234 | * we're done with the request. | |
2235 | */ | |
2236 | orig_request = obj_request->obj_request; | |
2237 | obj_request->obj_request = NULL; | |
2238 | rbd_assert(orig_request); | |
2239 | rbd_assert(orig_request->img_request); | |
2240 | ||
2241 | result = obj_request->result; | |
2242 | obj_request->result = 0; | |
2243 | ||
2244 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2245 | obj_request, orig_request, result, | |
2246 | obj_request->xferred, obj_request->length); | |
2247 | rbd_obj_request_put(obj_request); | |
2248 | ||
2249 | rbd_assert(orig_request); | |
2250 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2251 | |
2252 | /* | |
2253 | * Our only purpose here is to determine whether the object | |
2254 | * exists, and we don't want to treat the non-existence as | |
2255 | * an error. If something else comes back, transfer the | |
2256 | * error to the original request and complete it now. | |
2257 | */ | |
2258 | if (!result) { | |
2259 | obj_request_existence_set(orig_request, true); | |
2260 | } else if (result == -ENOENT) { | |
2261 | obj_request_existence_set(orig_request, false); | |
2262 | } else if (result) { | |
2263 | orig_request->result = result; | |
3d7efd18 | 2264 | goto out; |
c5b5ef6c AE |
2265 | } |
2266 | ||
2267 | /* | |
2268 | * Resubmit the original request now that we have recorded | |
2269 | * whether the target object exists. | |
2270 | */ | |
b454e36d | 2271 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2272 | out: |
c5b5ef6c AE |
2273 | if (orig_request->result) |
2274 | rbd_obj_request_complete(orig_request); | |
2275 | rbd_obj_request_put(orig_request); | |
2276 | } | |
2277 | ||
2278 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2279 | { | |
2280 | struct rbd_obj_request *stat_request; | |
2281 | struct rbd_device *rbd_dev; | |
2282 | struct ceph_osd_client *osdc; | |
2283 | struct page **pages = NULL; | |
2284 | u32 page_count; | |
2285 | size_t size; | |
2286 | int ret; | |
2287 | ||
2288 | /* | |
2289 | * The response data for a STAT call consists of: | |
2290 | * le64 length; | |
2291 | * struct { | |
2292 | * le32 tv_sec; | |
2293 | * le32 tv_nsec; | |
2294 | * } mtime; | |
2295 | */ | |
2296 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2297 | page_count = (u32)calc_pages_for(0, size); | |
2298 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2299 | if (IS_ERR(pages)) | |
2300 | return PTR_ERR(pages); | |
2301 | ||
2302 | ret = -ENOMEM; | |
2303 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2304 | OBJ_REQUEST_PAGES); | |
2305 | if (!stat_request) | |
2306 | goto out; | |
2307 | ||
2308 | rbd_obj_request_get(obj_request); | |
2309 | stat_request->obj_request = obj_request; | |
2310 | stat_request->pages = pages; | |
2311 | stat_request->page_count = page_count; | |
2312 | ||
2313 | rbd_assert(obj_request->img_request); | |
2314 | rbd_dev = obj_request->img_request->rbd_dev; | |
2315 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2316 | stat_request); | |
2317 | if (!stat_request->osd_req) | |
2318 | goto out; | |
2319 | stat_request->callback = rbd_img_obj_exists_callback; | |
2320 | ||
2321 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2322 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2323 | false, false); | |
9d4df01f | 2324 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2325 | |
2326 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2327 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2328 | out: | |
2329 | if (ret) | |
2330 | rbd_obj_request_put(obj_request); | |
2331 | ||
2332 | return ret; | |
2333 | } | |
2334 | ||
b454e36d AE |
2335 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2336 | { | |
2337 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2338 | struct rbd_device *rbd_dev; |
3d7efd18 | 2339 | bool known; |
b454e36d AE |
2340 | |
2341 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2342 | ||
2343 | img_request = obj_request->img_request; | |
2344 | rbd_assert(img_request); | |
a9e8ba2c | 2345 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2346 | |
b454e36d | 2347 | /* |
a9e8ba2c AE |
2348 | * Only writes to layered images need special handling. |
2349 | * Reads and non-layered writes are simple object requests. | |
2350 | * Layered writes that start beyond the end of the overlap | |
2351 | * with the parent have no parent data, so they too are | |
2352 | * simple object requests. Finally, if the target object is | |
2353 | * known to already exist, its parent data has already been | |
2354 | * copied, so a write to the object can also be handled as a | |
2355 | * simple object request. | |
b454e36d AE |
2356 | */ |
2357 | if (!img_request_write_test(img_request) || | |
2358 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2359 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2360 | ((known = obj_request_known_test(obj_request)) && |
2361 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2362 | |
2363 | struct rbd_device *rbd_dev; | |
2364 | struct ceph_osd_client *osdc; | |
2365 | ||
2366 | rbd_dev = obj_request->img_request->rbd_dev; | |
2367 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2368 | ||
2369 | return rbd_obj_request_submit(osdc, obj_request); | |
2370 | } | |
2371 | ||
2372 | /* | |
3d7efd18 AE |
2373 | * It's a layered write. The target object might exist but |
2374 | * we may not know that yet. If we know it doesn't exist, | |
2375 | * start by reading the data for the full target object from | |
2376 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2377 | */ |
3d7efd18 AE |
2378 | if (known) |
2379 | return rbd_img_obj_parent_read_full(obj_request); | |
2380 | ||
2381 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2382 | |
2383 | return rbd_img_obj_exists_submit(obj_request); | |
2384 | } | |
2385 | ||
bf0d5f50 AE |
2386 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2387 | { | |
bf0d5f50 | 2388 | struct rbd_obj_request *obj_request; |
46faeed4 | 2389 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2390 | |
37206ee5 | 2391 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2392 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2393 | int ret; |
2394 | ||
b454e36d | 2395 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2396 | if (ret) |
2397 | return ret; | |
bf0d5f50 AE |
2398 | } |
2399 | ||
2400 | return 0; | |
2401 | } | |
8b3e1a56 AE |
2402 | |
2403 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2404 | { | |
2405 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2406 | struct rbd_device *rbd_dev; |
2407 | u64 obj_end; | |
8b3e1a56 AE |
2408 | |
2409 | rbd_assert(img_request_child_test(img_request)); | |
2410 | ||
2411 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2412 | rbd_assert(obj_request); |
2413 | rbd_assert(obj_request->img_request); | |
2414 | ||
8b3e1a56 | 2415 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2416 | if (obj_request->result) |
2417 | goto out; | |
2418 | ||
2419 | /* | |
2420 | * We need to zero anything beyond the parent overlap | |
2421 | * boundary. Since rbd_img_obj_request_read_callback() | |
2422 | * will zero anything beyond the end of a short read, an | |
2423 | * easy way to do this is to pretend the data from the | |
2424 | * parent came up short--ending at the overlap boundary. | |
2425 | */ | |
2426 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2427 | obj_end = obj_request->img_offset + obj_request->length; | |
2428 | rbd_dev = obj_request->img_request->rbd_dev; | |
2429 | if (obj_end > rbd_dev->parent_overlap) { | |
2430 | u64 xferred = 0; | |
2431 | ||
2432 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2433 | xferred = rbd_dev->parent_overlap - | |
2434 | obj_request->img_offset; | |
8b3e1a56 | 2435 | |
a9e8ba2c AE |
2436 | obj_request->xferred = min(img_request->xferred, xferred); |
2437 | } else { | |
2438 | obj_request->xferred = img_request->xferred; | |
2439 | } | |
2440 | out: | |
8b3e1a56 AE |
2441 | rbd_img_obj_request_read_callback(obj_request); |
2442 | rbd_obj_request_complete(obj_request); | |
2443 | } | |
2444 | ||
2445 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2446 | { | |
2447 | struct rbd_device *rbd_dev; | |
2448 | struct rbd_img_request *img_request; | |
2449 | int result; | |
2450 | ||
2451 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2452 | rbd_assert(obj_request->img_request != NULL); | |
2453 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2454 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2455 | ||
2456 | rbd_dev = obj_request->img_request->rbd_dev; | |
2457 | rbd_assert(rbd_dev->parent != NULL); | |
2458 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2459 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2460 | obj_request->img_offset, | |
2461 | obj_request->length, | |
2462 | false, true); | |
2463 | result = -ENOMEM; | |
2464 | if (!img_request) | |
2465 | goto out_err; | |
2466 | ||
2467 | rbd_obj_request_get(obj_request); | |
2468 | img_request->obj_request = obj_request; | |
2469 | ||
f1a4739f AE |
2470 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2471 | obj_request->bio_list); | |
8b3e1a56 AE |
2472 | if (result) |
2473 | goto out_err; | |
2474 | ||
2475 | img_request->callback = rbd_img_parent_read_callback; | |
2476 | result = rbd_img_request_submit(img_request); | |
2477 | if (result) | |
2478 | goto out_err; | |
2479 | ||
2480 | return; | |
2481 | out_err: | |
2482 | if (img_request) | |
2483 | rbd_img_request_put(img_request); | |
2484 | obj_request->result = result; | |
2485 | obj_request->xferred = 0; | |
2486 | obj_request_done_set(obj_request); | |
2487 | } | |
bf0d5f50 | 2488 | |
cf81b60e | 2489 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, |
b8d70035 AE |
2490 | u64 ver, u64 notify_id) |
2491 | { | |
2492 | struct rbd_obj_request *obj_request; | |
2169238d | 2493 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2494 | int ret; |
2495 | ||
2496 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2497 | OBJ_REQUEST_NODATA); | |
2498 | if (!obj_request) | |
2499 | return -ENOMEM; | |
2500 | ||
2501 | ret = -ENOMEM; | |
430c28c3 | 2502 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2503 | if (!obj_request->osd_req) |
2504 | goto out; | |
2169238d | 2505 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2506 | |
c99d2d4a AE |
2507 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
2508 | notify_id, ver, 0); | |
9d4df01f | 2509 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2510 | |
b8d70035 | 2511 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2512 | out: |
cf81b60e AE |
2513 | if (ret) |
2514 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2515 | |
2516 | return ret; | |
2517 | } | |
2518 | ||
2519 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2520 | { | |
2521 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
2522 | u64 hver; | |
2523 | int rc; | |
2524 | ||
2525 | if (!rbd_dev) | |
2526 | return; | |
2527 | ||
37206ee5 | 2528 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
b8d70035 AE |
2529 | rbd_dev->header_name, (unsigned long long) notify_id, |
2530 | (unsigned int) opcode); | |
2531 | rc = rbd_dev_refresh(rbd_dev, &hver); | |
2532 | if (rc) | |
2533 | rbd_warn(rbd_dev, "got notification but failed to " | |
2534 | " update snaps: %d\n", rc); | |
2535 | ||
cf81b60e | 2536 | rbd_obj_notify_ack(rbd_dev, hver, notify_id); |
b8d70035 AE |
2537 | } |
2538 | ||
9969ebc5 AE |
2539 | /* |
2540 | * Request sync osd watch/unwatch. The value of "start" determines | |
2541 | * whether a watch request is being initiated or torn down. | |
2542 | */ | |
2543 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2544 | { | |
2545 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2546 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2547 | int ret; |
2548 | ||
2549 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2550 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2551 | ||
2552 | if (start) { | |
3c663bbd | 2553 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2554 | &rbd_dev->watch_event); |
2555 | if (ret < 0) | |
2556 | return ret; | |
8eb87565 | 2557 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2558 | } |
2559 | ||
2560 | ret = -ENOMEM; | |
2561 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2562 | OBJ_REQUEST_NODATA); | |
2563 | if (!obj_request) | |
2564 | goto out_cancel; | |
2565 | ||
430c28c3 AE |
2566 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2567 | if (!obj_request->osd_req) | |
2568 | goto out_cancel; | |
2569 | ||
8eb87565 | 2570 | if (start) |
975241af | 2571 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2572 | else |
6977c3f9 | 2573 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2574 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2575 | |
2576 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
2577 | rbd_dev->watch_event->cookie, | |
2578 | rbd_dev->header.obj_version, start); | |
9d4df01f | 2579 | rbd_osd_req_format_write(obj_request); |
2169238d | 2580 | |
9969ebc5 AE |
2581 | ret = rbd_obj_request_submit(osdc, obj_request); |
2582 | if (ret) | |
2583 | goto out_cancel; | |
2584 | ret = rbd_obj_request_wait(obj_request); | |
2585 | if (ret) | |
2586 | goto out_cancel; | |
9969ebc5 AE |
2587 | ret = obj_request->result; |
2588 | if (ret) | |
2589 | goto out_cancel; | |
2590 | ||
8eb87565 AE |
2591 | /* |
2592 | * A watch request is set to linger, so the underlying osd | |
2593 | * request won't go away until we unregister it. We retain | |
2594 | * a pointer to the object request during that time (in | |
2595 | * rbd_dev->watch_request), so we'll keep a reference to | |
2596 | * it. We'll drop that reference (below) after we've | |
2597 | * unregistered it. | |
2598 | */ | |
2599 | if (start) { | |
2600 | rbd_dev->watch_request = obj_request; | |
2601 | ||
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | /* We have successfully torn down the watch request */ | |
2606 | ||
2607 | rbd_obj_request_put(rbd_dev->watch_request); | |
2608 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2609 | out_cancel: |
2610 | /* Cancel the event if we're tearing down, or on error */ | |
2611 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2612 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2613 | if (obj_request) |
2614 | rbd_obj_request_put(obj_request); | |
2615 | ||
2616 | return ret; | |
2617 | } | |
2618 | ||
36be9a76 AE |
2619 | /* |
2620 | * Synchronous osd object method call | |
2621 | */ | |
2622 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2623 | const char *object_name, | |
2624 | const char *class_name, | |
2625 | const char *method_name, | |
2626 | const char *outbound, | |
2627 | size_t outbound_size, | |
2628 | char *inbound, | |
2629 | size_t inbound_size, | |
2630 | u64 *version) | |
2631 | { | |
2169238d | 2632 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2633 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2634 | struct page **pages; |
2635 | u32 page_count; | |
2636 | int ret; | |
2637 | ||
2638 | /* | |
6010a451 AE |
2639 | * Method calls are ultimately read operations. The result |
2640 | * should placed into the inbound buffer provided. They | |
2641 | * also supply outbound data--parameters for the object | |
2642 | * method. Currently if this is present it will be a | |
2643 | * snapshot id. | |
36be9a76 AE |
2644 | */ |
2645 | page_count = (u32) calc_pages_for(0, inbound_size); | |
2646 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2647 | if (IS_ERR(pages)) | |
2648 | return PTR_ERR(pages); | |
2649 | ||
2650 | ret = -ENOMEM; | |
6010a451 | 2651 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2652 | OBJ_REQUEST_PAGES); |
2653 | if (!obj_request) | |
2654 | goto out; | |
2655 | ||
2656 | obj_request->pages = pages; | |
2657 | obj_request->page_count = page_count; | |
2658 | ||
430c28c3 | 2659 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2660 | if (!obj_request->osd_req) |
2661 | goto out; | |
2662 | ||
c99d2d4a | 2663 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2664 | class_name, method_name); |
2665 | if (outbound_size) { | |
2666 | struct ceph_pagelist *pagelist; | |
2667 | ||
2668 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2669 | if (!pagelist) | |
2670 | goto out; | |
2671 | ||
2672 | ceph_pagelist_init(pagelist); | |
2673 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2674 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2675 | pagelist); | |
2676 | } | |
a4ce40a9 AE |
2677 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2678 | obj_request->pages, inbound_size, | |
44cd188d | 2679 | 0, false, false); |
9d4df01f | 2680 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2681 | |
36be9a76 AE |
2682 | ret = rbd_obj_request_submit(osdc, obj_request); |
2683 | if (ret) | |
2684 | goto out; | |
2685 | ret = rbd_obj_request_wait(obj_request); | |
2686 | if (ret) | |
2687 | goto out; | |
2688 | ||
2689 | ret = obj_request->result; | |
2690 | if (ret < 0) | |
2691 | goto out; | |
23ed6e13 | 2692 | ret = 0; |
903bb32e | 2693 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2694 | if (version) |
2695 | *version = obj_request->version; | |
2696 | out: | |
2697 | if (obj_request) | |
2698 | rbd_obj_request_put(obj_request); | |
2699 | else | |
2700 | ceph_release_page_vector(pages, page_count); | |
2701 | ||
2702 | return ret; | |
2703 | } | |
2704 | ||
bf0d5f50 | 2705 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2706 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2707 | { |
2708 | struct rbd_device *rbd_dev = q->queuedata; | |
2709 | bool read_only = rbd_dev->mapping.read_only; | |
2710 | struct request *rq; | |
2711 | int result; | |
2712 | ||
2713 | while ((rq = blk_fetch_request(q))) { | |
2714 | bool write_request = rq_data_dir(rq) == WRITE; | |
2715 | struct rbd_img_request *img_request; | |
2716 | u64 offset; | |
2717 | u64 length; | |
2718 | ||
2719 | /* Ignore any non-FS requests that filter through. */ | |
2720 | ||
2721 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2722 | dout("%s: non-fs request type %d\n", __func__, |
2723 | (int) rq->cmd_type); | |
2724 | __blk_end_request_all(rq, 0); | |
2725 | continue; | |
2726 | } | |
2727 | ||
2728 | /* Ignore/skip any zero-length requests */ | |
2729 | ||
2730 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2731 | length = (u64) blk_rq_bytes(rq); | |
2732 | ||
2733 | if (!length) { | |
2734 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2735 | __blk_end_request_all(rq, 0); |
2736 | continue; | |
2737 | } | |
2738 | ||
2739 | spin_unlock_irq(q->queue_lock); | |
2740 | ||
2741 | /* Disallow writes to a read-only device */ | |
2742 | ||
2743 | if (write_request) { | |
2744 | result = -EROFS; | |
2745 | if (read_only) | |
2746 | goto end_request; | |
2747 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2748 | } | |
2749 | ||
6d292906 AE |
2750 | /* |
2751 | * Quit early if the mapped snapshot no longer | |
2752 | * exists. It's still possible the snapshot will | |
2753 | * have disappeared by the time our request arrives | |
2754 | * at the osd, but there's no sense in sending it if | |
2755 | * we already know. | |
2756 | */ | |
2757 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2758 | dout("request for non-existent snapshot"); |
2759 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2760 | result = -ENXIO; | |
2761 | goto end_request; | |
2762 | } | |
2763 | ||
bf0d5f50 AE |
2764 | result = -EINVAL; |
2765 | if (WARN_ON(offset && length > U64_MAX - offset + 1)) | |
2766 | goto end_request; /* Shouldn't happen */ | |
2767 | ||
2768 | result = -ENOMEM; | |
2769 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2770 | write_request, false); |
bf0d5f50 AE |
2771 | if (!img_request) |
2772 | goto end_request; | |
2773 | ||
2774 | img_request->rq = rq; | |
2775 | ||
f1a4739f AE |
2776 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2777 | rq->bio); | |
bf0d5f50 AE |
2778 | if (!result) |
2779 | result = rbd_img_request_submit(img_request); | |
2780 | if (result) | |
2781 | rbd_img_request_put(img_request); | |
2782 | end_request: | |
2783 | spin_lock_irq(q->queue_lock); | |
2784 | if (result < 0) { | |
7da22d29 AE |
2785 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2786 | write_request ? "write" : "read", | |
2787 | length, offset, result); | |
2788 | ||
bf0d5f50 AE |
2789 | __blk_end_request_all(rq, result); |
2790 | } | |
2791 | } | |
2792 | } | |
2793 | ||
602adf40 YS |
2794 | /* |
2795 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2796 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2797 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2798 | */ |
2799 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2800 | struct bio_vec *bvec) | |
2801 | { | |
2802 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2803 | sector_t sector_offset; |
2804 | sector_t sectors_per_obj; | |
2805 | sector_t obj_sector_offset; | |
2806 | int ret; | |
2807 | ||
2808 | /* | |
2809 | * Find how far into its rbd object the partition-relative | |
2810 | * bio start sector is to offset relative to the enclosing | |
2811 | * device. | |
2812 | */ | |
2813 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2814 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2815 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2816 | ||
2817 | /* | |
2818 | * Compute the number of bytes from that offset to the end | |
2819 | * of the object. Account for what's already used by the bio. | |
2820 | */ | |
2821 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2822 | if (ret > bmd->bi_size) | |
2823 | ret -= bmd->bi_size; | |
2824 | else | |
2825 | ret = 0; | |
2826 | ||
2827 | /* | |
2828 | * Don't send back more than was asked for. And if the bio | |
2829 | * was empty, let the whole thing through because: "Note | |
2830 | * that a block device *must* allow a single page to be | |
2831 | * added to an empty bio." | |
2832 | */ | |
2833 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2834 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2835 | ret = (int) bvec->bv_len; | |
2836 | ||
2837 | return ret; | |
602adf40 YS |
2838 | } |
2839 | ||
2840 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2841 | { | |
2842 | struct gendisk *disk = rbd_dev->disk; | |
2843 | ||
2844 | if (!disk) | |
2845 | return; | |
2846 | ||
602adf40 YS |
2847 | if (disk->flags & GENHD_FL_UP) |
2848 | del_gendisk(disk); | |
2849 | if (disk->queue) | |
2850 | blk_cleanup_queue(disk->queue); | |
2851 | put_disk(disk); | |
2852 | } | |
2853 | ||
788e2df3 AE |
2854 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2855 | const char *object_name, | |
2856 | u64 offset, u64 length, | |
2857 | char *buf, u64 *version) | |
2858 | ||
2859 | { | |
2169238d | 2860 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2861 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2862 | struct page **pages = NULL; |
2863 | u32 page_count; | |
1ceae7ef | 2864 | size_t size; |
788e2df3 AE |
2865 | int ret; |
2866 | ||
2867 | page_count = (u32) calc_pages_for(offset, length); | |
2868 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2869 | if (IS_ERR(pages)) | |
2870 | ret = PTR_ERR(pages); | |
2871 | ||
2872 | ret = -ENOMEM; | |
2873 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2874 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2875 | if (!obj_request) |
2876 | goto out; | |
2877 | ||
2878 | obj_request->pages = pages; | |
2879 | obj_request->page_count = page_count; | |
2880 | ||
430c28c3 | 2881 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2882 | if (!obj_request->osd_req) |
2883 | goto out; | |
2884 | ||
c99d2d4a AE |
2885 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2886 | offset, length, 0, 0); | |
406e2c9f | 2887 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2888 | obj_request->pages, |
44cd188d AE |
2889 | obj_request->length, |
2890 | obj_request->offset & ~PAGE_MASK, | |
2891 | false, false); | |
9d4df01f | 2892 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2893 | |
788e2df3 AE |
2894 | ret = rbd_obj_request_submit(osdc, obj_request); |
2895 | if (ret) | |
2896 | goto out; | |
2897 | ret = rbd_obj_request_wait(obj_request); | |
2898 | if (ret) | |
2899 | goto out; | |
2900 | ||
2901 | ret = obj_request->result; | |
2902 | if (ret < 0) | |
2903 | goto out; | |
1ceae7ef AE |
2904 | |
2905 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2906 | size = (size_t) obj_request->xferred; | |
903bb32e | 2907 | ceph_copy_from_page_vector(pages, buf, 0, size); |
23ed6e13 AE |
2908 | rbd_assert(size <= (size_t) INT_MAX); |
2909 | ret = (int) size; | |
788e2df3 AE |
2910 | if (version) |
2911 | *version = obj_request->version; | |
2912 | out: | |
2913 | if (obj_request) | |
2914 | rbd_obj_request_put(obj_request); | |
2915 | else | |
2916 | ceph_release_page_vector(pages, page_count); | |
2917 | ||
2918 | return ret; | |
2919 | } | |
2920 | ||
602adf40 | 2921 | /* |
4156d998 AE |
2922 | * Read the complete header for the given rbd device. |
2923 | * | |
2924 | * Returns a pointer to a dynamically-allocated buffer containing | |
2925 | * the complete and validated header. Caller can pass the address | |
2926 | * of a variable that will be filled in with the version of the | |
2927 | * header object at the time it was read. | |
2928 | * | |
2929 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2930 | */ |
4156d998 AE |
2931 | static struct rbd_image_header_ondisk * |
2932 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) | |
602adf40 | 2933 | { |
4156d998 | 2934 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2935 | u32 snap_count = 0; |
4156d998 AE |
2936 | u64 names_size = 0; |
2937 | u32 want_count; | |
2938 | int ret; | |
602adf40 | 2939 | |
00f1f36f | 2940 | /* |
4156d998 AE |
2941 | * The complete header will include an array of its 64-bit |
2942 | * snapshot ids, followed by the names of those snapshots as | |
2943 | * a contiguous block of NUL-terminated strings. Note that | |
2944 | * the number of snapshots could change by the time we read | |
2945 | * it in, in which case we re-read it. | |
00f1f36f | 2946 | */ |
4156d998 AE |
2947 | do { |
2948 | size_t size; | |
2949 | ||
2950 | kfree(ondisk); | |
2951 | ||
2952 | size = sizeof (*ondisk); | |
2953 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
2954 | size += names_size; | |
2955 | ondisk = kmalloc(size, GFP_KERNEL); | |
2956 | if (!ondisk) | |
2957 | return ERR_PTR(-ENOMEM); | |
2958 | ||
788e2df3 | 2959 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
4156d998 AE |
2960 | 0, size, |
2961 | (char *) ondisk, version); | |
4156d998 AE |
2962 | if (ret < 0) |
2963 | goto out_err; | |
2964 | if (WARN_ON((size_t) ret < size)) { | |
2965 | ret = -ENXIO; | |
06ecc6cb AE |
2966 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2967 | size, ret); | |
4156d998 AE |
2968 | goto out_err; |
2969 | } | |
2970 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
2971 | ret = -ENXIO; | |
06ecc6cb | 2972 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 2973 | goto out_err; |
81e759fb | 2974 | } |
602adf40 | 2975 | |
4156d998 AE |
2976 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2977 | want_count = snap_count; | |
2978 | snap_count = le32_to_cpu(ondisk->snap_count); | |
2979 | } while (snap_count != want_count); | |
00f1f36f | 2980 | |
4156d998 | 2981 | return ondisk; |
00f1f36f | 2982 | |
4156d998 AE |
2983 | out_err: |
2984 | kfree(ondisk); | |
2985 | ||
2986 | return ERR_PTR(ret); | |
2987 | } | |
2988 | ||
2989 | /* | |
2990 | * reload the ondisk the header | |
2991 | */ | |
2992 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
2993 | struct rbd_image_header *header) | |
2994 | { | |
2995 | struct rbd_image_header_ondisk *ondisk; | |
2996 | u64 ver = 0; | |
2997 | int ret; | |
602adf40 | 2998 | |
4156d998 AE |
2999 | ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
3000 | if (IS_ERR(ondisk)) | |
3001 | return PTR_ERR(ondisk); | |
3002 | ret = rbd_header_from_disk(header, ondisk); | |
3003 | if (ret >= 0) | |
3004 | header->obj_version = ver; | |
3005 | kfree(ondisk); | |
3006 | ||
3007 | return ret; | |
602adf40 YS |
3008 | } |
3009 | ||
41f38c2b | 3010 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
3011 | { |
3012 | struct rbd_snap *snap; | |
a0593290 | 3013 | struct rbd_snap *next; |
dfc5606d | 3014 | |
a0593290 | 3015 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
41f38c2b | 3016 | rbd_remove_snap_dev(snap); |
dfc5606d YS |
3017 | } |
3018 | ||
9478554a AE |
3019 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
3020 | { | |
3021 | sector_t size; | |
3022 | ||
0d7dbfce | 3023 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
3024 | return; |
3025 | ||
3026 | size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; | |
3027 | dout("setting size to %llu sectors", (unsigned long long) size); | |
3028 | rbd_dev->mapping.size = (u64) size; | |
3029 | set_capacity(rbd_dev->disk, size); | |
3030 | } | |
3031 | ||
602adf40 YS |
3032 | /* |
3033 | * only read the first part of the ondisk header, without the snaps info | |
3034 | */ | |
117973fb | 3035 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
602adf40 YS |
3036 | { |
3037 | int ret; | |
3038 | struct rbd_image_header h; | |
602adf40 YS |
3039 | |
3040 | ret = rbd_read_header(rbd_dev, &h); | |
3041 | if (ret < 0) | |
3042 | return ret; | |
3043 | ||
a51aa0c0 JD |
3044 | down_write(&rbd_dev->header_rwsem); |
3045 | ||
9478554a AE |
3046 | /* Update image size, and check for resize of mapped image */ |
3047 | rbd_dev->header.image_size = h.image_size; | |
3048 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 3049 | |
849b4260 | 3050 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3051 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3052 | kfree(rbd_dev->header.snap_names); |
d1d25646 JD |
3053 | /* osd requests may still refer to snapc */ |
3054 | ceph_put_snap_context(rbd_dev->header.snapc); | |
602adf40 | 3055 | |
b813623a AE |
3056 | if (hver) |
3057 | *hver = h.obj_version; | |
a71b891b | 3058 | rbd_dev->header.obj_version = h.obj_version; |
93a24e08 | 3059 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3060 | rbd_dev->header.snapc = h.snapc; |
3061 | rbd_dev->header.snap_names = h.snap_names; | |
3062 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 AE |
3063 | /* Free the extra copy of the object prefix */ |
3064 | WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); | |
3065 | kfree(h.object_prefix); | |
3066 | ||
304f6808 AE |
3067 | ret = rbd_dev_snaps_update(rbd_dev); |
3068 | if (!ret) | |
3069 | ret = rbd_dev_snaps_register(rbd_dev); | |
dfc5606d | 3070 | |
c666601a | 3071 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3072 | |
dfc5606d | 3073 | return ret; |
602adf40 YS |
3074 | } |
3075 | ||
117973fb | 3076 | static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
1fe5e993 AE |
3077 | { |
3078 | int ret; | |
3079 | ||
117973fb | 3080 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1fe5e993 | 3081 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb AE |
3082 | if (rbd_dev->image_format == 1) |
3083 | ret = rbd_dev_v1_refresh(rbd_dev, hver); | |
3084 | else | |
3085 | ret = rbd_dev_v2_refresh(rbd_dev, hver); | |
1fe5e993 | 3086 | mutex_unlock(&ctl_mutex); |
d98df63e | 3087 | revalidate_disk(rbd_dev->disk); |
1fe5e993 AE |
3088 | |
3089 | return ret; | |
3090 | } | |
3091 | ||
602adf40 YS |
3092 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3093 | { | |
3094 | struct gendisk *disk; | |
3095 | struct request_queue *q; | |
593a9e7b | 3096 | u64 segment_size; |
602adf40 | 3097 | |
602adf40 | 3098 | /* create gendisk info */ |
602adf40 YS |
3099 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3100 | if (!disk) | |
1fcdb8aa | 3101 | return -ENOMEM; |
602adf40 | 3102 | |
f0f8cef5 | 3103 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3104 | rbd_dev->dev_id); |
602adf40 YS |
3105 | disk->major = rbd_dev->major; |
3106 | disk->first_minor = 0; | |
3107 | disk->fops = &rbd_bd_ops; | |
3108 | disk->private_data = rbd_dev; | |
3109 | ||
bf0d5f50 | 3110 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3111 | if (!q) |
3112 | goto out_disk; | |
029bcbd8 | 3113 | |
593a9e7b AE |
3114 | /* We use the default size, but let's be explicit about it. */ |
3115 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3116 | ||
029bcbd8 | 3117 | /* set io sizes to object size */ |
593a9e7b AE |
3118 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3119 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3120 | blk_queue_max_segment_size(q, segment_size); | |
3121 | blk_queue_io_min(q, segment_size); | |
3122 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3123 | |
602adf40 YS |
3124 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3125 | disk->queue = q; | |
3126 | ||
3127 | q->queuedata = rbd_dev; | |
3128 | ||
3129 | rbd_dev->disk = disk; | |
602adf40 | 3130 | |
12f02944 AE |
3131 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
3132 | ||
602adf40 | 3133 | return 0; |
602adf40 YS |
3134 | out_disk: |
3135 | put_disk(disk); | |
1fcdb8aa AE |
3136 | |
3137 | return -ENOMEM; | |
602adf40 YS |
3138 | } |
3139 | ||
dfc5606d YS |
3140 | /* |
3141 | sysfs | |
3142 | */ | |
3143 | ||
593a9e7b AE |
3144 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3145 | { | |
3146 | return container_of(dev, struct rbd_device, dev); | |
3147 | } | |
3148 | ||
dfc5606d YS |
3149 | static ssize_t rbd_size_show(struct device *dev, |
3150 | struct device_attribute *attr, char *buf) | |
3151 | { | |
593a9e7b | 3152 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 JD |
3153 | sector_t size; |
3154 | ||
3155 | down_read(&rbd_dev->header_rwsem); | |
3156 | size = get_capacity(rbd_dev->disk); | |
3157 | up_read(&rbd_dev->header_rwsem); | |
dfc5606d | 3158 | |
a51aa0c0 | 3159 | return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); |
dfc5606d YS |
3160 | } |
3161 | ||
34b13184 AE |
3162 | /* |
3163 | * Note this shows the features for whatever's mapped, which is not | |
3164 | * necessarily the base image. | |
3165 | */ | |
3166 | static ssize_t rbd_features_show(struct device *dev, | |
3167 | struct device_attribute *attr, char *buf) | |
3168 | { | |
3169 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3170 | ||
3171 | return sprintf(buf, "0x%016llx\n", | |
3172 | (unsigned long long) rbd_dev->mapping.features); | |
3173 | } | |
3174 | ||
dfc5606d YS |
3175 | static ssize_t rbd_major_show(struct device *dev, |
3176 | struct device_attribute *attr, char *buf) | |
3177 | { | |
593a9e7b | 3178 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3179 | |
dfc5606d YS |
3180 | return sprintf(buf, "%d\n", rbd_dev->major); |
3181 | } | |
3182 | ||
3183 | static ssize_t rbd_client_id_show(struct device *dev, | |
3184 | struct device_attribute *attr, char *buf) | |
602adf40 | 3185 | { |
593a9e7b | 3186 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3187 | |
1dbb4399 AE |
3188 | return sprintf(buf, "client%lld\n", |
3189 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3190 | } |
3191 | ||
dfc5606d YS |
3192 | static ssize_t rbd_pool_show(struct device *dev, |
3193 | struct device_attribute *attr, char *buf) | |
602adf40 | 3194 | { |
593a9e7b | 3195 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3196 | |
0d7dbfce | 3197 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3198 | } |
3199 | ||
9bb2f334 AE |
3200 | static ssize_t rbd_pool_id_show(struct device *dev, |
3201 | struct device_attribute *attr, char *buf) | |
3202 | { | |
3203 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3204 | ||
0d7dbfce AE |
3205 | return sprintf(buf, "%llu\n", |
3206 | (unsigned long long) rbd_dev->spec->pool_id); | |
9bb2f334 AE |
3207 | } |
3208 | ||
dfc5606d YS |
3209 | static ssize_t rbd_name_show(struct device *dev, |
3210 | struct device_attribute *attr, char *buf) | |
3211 | { | |
593a9e7b | 3212 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3213 | |
a92ffdf8 AE |
3214 | if (rbd_dev->spec->image_name) |
3215 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3216 | ||
3217 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3218 | } |
3219 | ||
589d30e0 AE |
3220 | static ssize_t rbd_image_id_show(struct device *dev, |
3221 | struct device_attribute *attr, char *buf) | |
3222 | { | |
3223 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3224 | ||
0d7dbfce | 3225 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3226 | } |
3227 | ||
34b13184 AE |
3228 | /* |
3229 | * Shows the name of the currently-mapped snapshot (or | |
3230 | * RBD_SNAP_HEAD_NAME for the base image). | |
3231 | */ | |
dfc5606d YS |
3232 | static ssize_t rbd_snap_show(struct device *dev, |
3233 | struct device_attribute *attr, | |
3234 | char *buf) | |
3235 | { | |
593a9e7b | 3236 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3237 | |
0d7dbfce | 3238 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3239 | } |
3240 | ||
86b00e0d AE |
3241 | /* |
3242 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3243 | * for the parent image. If there is no parent, simply shows | |
3244 | * "(no parent image)". | |
3245 | */ | |
3246 | static ssize_t rbd_parent_show(struct device *dev, | |
3247 | struct device_attribute *attr, | |
3248 | char *buf) | |
3249 | { | |
3250 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3251 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3252 | int count; | |
3253 | char *bufp = buf; | |
3254 | ||
3255 | if (!spec) | |
3256 | return sprintf(buf, "(no parent image)\n"); | |
3257 | ||
3258 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3259 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3260 | if (count < 0) | |
3261 | return count; | |
3262 | bufp += count; | |
3263 | ||
3264 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3265 | spec->image_name ? spec->image_name : "(unknown)"); | |
3266 | if (count < 0) | |
3267 | return count; | |
3268 | bufp += count; | |
3269 | ||
3270 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3271 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3272 | if (count < 0) | |
3273 | return count; | |
3274 | bufp += count; | |
3275 | ||
3276 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3277 | if (count < 0) | |
3278 | return count; | |
3279 | bufp += count; | |
3280 | ||
3281 | return (ssize_t) (bufp - buf); | |
3282 | } | |
3283 | ||
dfc5606d YS |
3284 | static ssize_t rbd_image_refresh(struct device *dev, |
3285 | struct device_attribute *attr, | |
3286 | const char *buf, | |
3287 | size_t size) | |
3288 | { | |
593a9e7b | 3289 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3290 | int ret; |
602adf40 | 3291 | |
117973fb | 3292 | ret = rbd_dev_refresh(rbd_dev, NULL); |
b813623a AE |
3293 | |
3294 | return ret < 0 ? ret : size; | |
dfc5606d | 3295 | } |
602adf40 | 3296 | |
dfc5606d | 3297 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3298 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3299 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3300 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3301 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3302 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3303 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3304 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3305 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3306 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3307 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3308 | |
3309 | static struct attribute *rbd_attrs[] = { | |
3310 | &dev_attr_size.attr, | |
34b13184 | 3311 | &dev_attr_features.attr, |
dfc5606d YS |
3312 | &dev_attr_major.attr, |
3313 | &dev_attr_client_id.attr, | |
3314 | &dev_attr_pool.attr, | |
9bb2f334 | 3315 | &dev_attr_pool_id.attr, |
dfc5606d | 3316 | &dev_attr_name.attr, |
589d30e0 | 3317 | &dev_attr_image_id.attr, |
dfc5606d | 3318 | &dev_attr_current_snap.attr, |
86b00e0d | 3319 | &dev_attr_parent.attr, |
dfc5606d | 3320 | &dev_attr_refresh.attr, |
dfc5606d YS |
3321 | NULL |
3322 | }; | |
3323 | ||
3324 | static struct attribute_group rbd_attr_group = { | |
3325 | .attrs = rbd_attrs, | |
3326 | }; | |
3327 | ||
3328 | static const struct attribute_group *rbd_attr_groups[] = { | |
3329 | &rbd_attr_group, | |
3330 | NULL | |
3331 | }; | |
3332 | ||
3333 | static void rbd_sysfs_dev_release(struct device *dev) | |
3334 | { | |
3335 | } | |
3336 | ||
3337 | static struct device_type rbd_device_type = { | |
3338 | .name = "rbd", | |
3339 | .groups = rbd_attr_groups, | |
3340 | .release = rbd_sysfs_dev_release, | |
3341 | }; | |
3342 | ||
3343 | ||
3344 | /* | |
3345 | sysfs - snapshots | |
3346 | */ | |
3347 | ||
3348 | static ssize_t rbd_snap_size_show(struct device *dev, | |
3349 | struct device_attribute *attr, | |
3350 | char *buf) | |
3351 | { | |
3352 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
3353 | ||
3591538f | 3354 | return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
dfc5606d YS |
3355 | } |
3356 | ||
3357 | static ssize_t rbd_snap_id_show(struct device *dev, | |
3358 | struct device_attribute *attr, | |
3359 | char *buf) | |
3360 | { | |
3361 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
3362 | ||
3591538f | 3363 | return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
dfc5606d YS |
3364 | } |
3365 | ||
34b13184 AE |
3366 | static ssize_t rbd_snap_features_show(struct device *dev, |
3367 | struct device_attribute *attr, | |
3368 | char *buf) | |
3369 | { | |
3370 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
3371 | ||
3372 | return sprintf(buf, "0x%016llx\n", | |
3373 | (unsigned long long) snap->features); | |
3374 | } | |
3375 | ||
dfc5606d YS |
3376 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
3377 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
34b13184 | 3378 | static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
dfc5606d YS |
3379 | |
3380 | static struct attribute *rbd_snap_attrs[] = { | |
3381 | &dev_attr_snap_size.attr, | |
3382 | &dev_attr_snap_id.attr, | |
34b13184 | 3383 | &dev_attr_snap_features.attr, |
dfc5606d YS |
3384 | NULL, |
3385 | }; | |
3386 | ||
3387 | static struct attribute_group rbd_snap_attr_group = { | |
3388 | .attrs = rbd_snap_attrs, | |
3389 | }; | |
3390 | ||
3391 | static void rbd_snap_dev_release(struct device *dev) | |
3392 | { | |
3393 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
3394 | kfree(snap->name); | |
3395 | kfree(snap); | |
3396 | } | |
3397 | ||
3398 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
3399 | &rbd_snap_attr_group, | |
3400 | NULL | |
3401 | }; | |
3402 | ||
3403 | static struct device_type rbd_snap_device_type = { | |
3404 | .groups = rbd_snap_attr_groups, | |
3405 | .release = rbd_snap_dev_release, | |
3406 | }; | |
3407 | ||
8b8fb99c AE |
3408 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3409 | { | |
3410 | kref_get(&spec->kref); | |
3411 | ||
3412 | return spec; | |
3413 | } | |
3414 | ||
3415 | static void rbd_spec_free(struct kref *kref); | |
3416 | static void rbd_spec_put(struct rbd_spec *spec) | |
3417 | { | |
3418 | if (spec) | |
3419 | kref_put(&spec->kref, rbd_spec_free); | |
3420 | } | |
3421 | ||
3422 | static struct rbd_spec *rbd_spec_alloc(void) | |
3423 | { | |
3424 | struct rbd_spec *spec; | |
3425 | ||
3426 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3427 | if (!spec) | |
3428 | return NULL; | |
3429 | kref_init(&spec->kref); | |
3430 | ||
8b8fb99c AE |
3431 | return spec; |
3432 | } | |
3433 | ||
3434 | static void rbd_spec_free(struct kref *kref) | |
3435 | { | |
3436 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3437 | ||
3438 | kfree(spec->pool_name); | |
3439 | kfree(spec->image_id); | |
3440 | kfree(spec->image_name); | |
3441 | kfree(spec->snap_name); | |
3442 | kfree(spec); | |
3443 | } | |
3444 | ||
cc344fa1 | 3445 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3446 | struct rbd_spec *spec) |
3447 | { | |
3448 | struct rbd_device *rbd_dev; | |
3449 | ||
3450 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3451 | if (!rbd_dev) | |
3452 | return NULL; | |
3453 | ||
3454 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3455 | rbd_dev->flags = 0; |
c53d5893 AE |
3456 | INIT_LIST_HEAD(&rbd_dev->node); |
3457 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
3458 | init_rwsem(&rbd_dev->header_rwsem); | |
3459 | ||
3460 | rbd_dev->spec = spec; | |
3461 | rbd_dev->rbd_client = rbdc; | |
3462 | ||
0903e875 AE |
3463 | /* Initialize the layout used for all rbd requests */ |
3464 | ||
3465 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3466 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3467 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3468 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3469 | ||
c53d5893 AE |
3470 | return rbd_dev; |
3471 | } | |
3472 | ||
3473 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3474 | { | |
86b00e0d | 3475 | rbd_spec_put(rbd_dev->parent_spec); |
c53d5893 AE |
3476 | kfree(rbd_dev->header_name); |
3477 | rbd_put_client(rbd_dev->rbd_client); | |
3478 | rbd_spec_put(rbd_dev->spec); | |
3479 | kfree(rbd_dev); | |
3480 | } | |
3481 | ||
304f6808 AE |
3482 | static bool rbd_snap_registered(struct rbd_snap *snap) |
3483 | { | |
3484 | bool ret = snap->dev.type == &rbd_snap_device_type; | |
3485 | bool reg = device_is_registered(&snap->dev); | |
3486 | ||
3487 | rbd_assert(!ret ^ reg); | |
3488 | ||
3489 | return ret; | |
3490 | } | |
3491 | ||
41f38c2b | 3492 | static void rbd_remove_snap_dev(struct rbd_snap *snap) |
dfc5606d YS |
3493 | { |
3494 | list_del(&snap->node); | |
304f6808 AE |
3495 | if (device_is_registered(&snap->dev)) |
3496 | device_unregister(&snap->dev); | |
dfc5606d YS |
3497 | } |
3498 | ||
14e7085d | 3499 | static int rbd_register_snap_dev(struct rbd_snap *snap, |
dfc5606d YS |
3500 | struct device *parent) |
3501 | { | |
3502 | struct device *dev = &snap->dev; | |
3503 | int ret; | |
3504 | ||
3505 | dev->type = &rbd_snap_device_type; | |
3506 | dev->parent = parent; | |
3507 | dev->release = rbd_snap_dev_release; | |
d4b125e9 | 3508 | dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); |
304f6808 AE |
3509 | dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
3510 | ||
dfc5606d YS |
3511 | ret = device_register(dev); |
3512 | ||
3513 | return ret; | |
3514 | } | |
3515 | ||
4e891e0a | 3516 | static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
c8d18425 | 3517 | const char *snap_name, |
34b13184 AE |
3518 | u64 snap_id, u64 snap_size, |
3519 | u64 snap_features) | |
dfc5606d | 3520 | { |
4e891e0a | 3521 | struct rbd_snap *snap; |
dfc5606d | 3522 | int ret; |
4e891e0a AE |
3523 | |
3524 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 3525 | if (!snap) |
4e891e0a AE |
3526 | return ERR_PTR(-ENOMEM); |
3527 | ||
3528 | ret = -ENOMEM; | |
c8d18425 | 3529 | snap->name = kstrdup(snap_name, GFP_KERNEL); |
4e891e0a AE |
3530 | if (!snap->name) |
3531 | goto err; | |
3532 | ||
c8d18425 AE |
3533 | snap->id = snap_id; |
3534 | snap->size = snap_size; | |
34b13184 | 3535 | snap->features = snap_features; |
4e891e0a AE |
3536 | |
3537 | return snap; | |
3538 | ||
dfc5606d YS |
3539 | err: |
3540 | kfree(snap->name); | |
3541 | kfree(snap); | |
4e891e0a AE |
3542 | |
3543 | return ERR_PTR(ret); | |
dfc5606d YS |
3544 | } |
3545 | ||
cd892126 AE |
3546 | static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
3547 | u64 *snap_size, u64 *snap_features) | |
3548 | { | |
3549 | char *snap_name; | |
3550 | ||
3551 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
3552 | ||
3553 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
3554 | *snap_features = 0; /* No features for v1 */ | |
3555 | ||
3556 | /* Skip over names until we find the one we are looking for */ | |
3557 | ||
3558 | snap_name = rbd_dev->header.snap_names; | |
3559 | while (which--) | |
3560 | snap_name += strlen(snap_name) + 1; | |
3561 | ||
3562 | return snap_name; | |
3563 | } | |
3564 | ||
9d475de5 AE |
3565 | /* |
3566 | * Get the size and object order for an image snapshot, or if | |
3567 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3568 | * image. | |
3569 | */ | |
3570 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3571 | u8 *order, u64 *snap_size) | |
3572 | { | |
3573 | __le64 snapid = cpu_to_le64(snap_id); | |
3574 | int ret; | |
3575 | struct { | |
3576 | u8 order; | |
3577 | __le64 size; | |
3578 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3579 | ||
36be9a76 | 3580 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 AE |
3581 | "rbd", "get_size", |
3582 | (char *) &snapid, sizeof (snapid), | |
07b2391f | 3583 | (char *) &size_buf, sizeof (size_buf), NULL); |
36be9a76 | 3584 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3585 | if (ret < 0) |
3586 | return ret; | |
3587 | ||
3588 | *order = size_buf.order; | |
3589 | *snap_size = le64_to_cpu(size_buf.size); | |
3590 | ||
3591 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
3592 | (unsigned long long) snap_id, (unsigned int) *order, | |
3593 | (unsigned long long) *snap_size); | |
3594 | ||
3595 | return 0; | |
3596 | } | |
3597 | ||
3598 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3599 | { | |
3600 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3601 | &rbd_dev->header.obj_order, | |
3602 | &rbd_dev->header.image_size); | |
3603 | } | |
3604 | ||
1e130199 AE |
3605 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3606 | { | |
3607 | void *reply_buf; | |
3608 | int ret; | |
3609 | void *p; | |
3610 | ||
3611 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3612 | if (!reply_buf) | |
3613 | return -ENOMEM; | |
3614 | ||
36be9a76 | 3615 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
1e130199 AE |
3616 | "rbd", "get_object_prefix", |
3617 | NULL, 0, | |
07b2391f | 3618 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
36be9a76 | 3619 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3620 | if (ret < 0) |
3621 | goto out; | |
3622 | ||
3623 | p = reply_buf; | |
3624 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
3625 | p + RBD_OBJ_PREFIX_LEN_MAX, | |
3626 | NULL, GFP_NOIO); | |
3627 | ||
3628 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3629 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3630 | rbd_dev->header.object_prefix = NULL; | |
3631 | } else { | |
3632 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3633 | } | |
3634 | ||
3635 | out: | |
3636 | kfree(reply_buf); | |
3637 | ||
3638 | return ret; | |
3639 | } | |
3640 | ||
b1b5402a AE |
3641 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3642 | u64 *snap_features) | |
3643 | { | |
3644 | __le64 snapid = cpu_to_le64(snap_id); | |
3645 | struct { | |
3646 | __le64 features; | |
3647 | __le64 incompat; | |
3648 | } features_buf = { 0 }; | |
d889140c | 3649 | u64 incompat; |
b1b5402a AE |
3650 | int ret; |
3651 | ||
36be9a76 | 3652 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a AE |
3653 | "rbd", "get_features", |
3654 | (char *) &snapid, sizeof (snapid), | |
3655 | (char *) &features_buf, sizeof (features_buf), | |
07b2391f | 3656 | NULL); |
36be9a76 | 3657 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3658 | if (ret < 0) |
3659 | return ret; | |
d889140c AE |
3660 | |
3661 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3662 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3663 | return -ENXIO; |
d889140c | 3664 | |
b1b5402a AE |
3665 | *snap_features = le64_to_cpu(features_buf.features); |
3666 | ||
3667 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
3668 | (unsigned long long) snap_id, | |
3669 | (unsigned long long) *snap_features, | |
3670 | (unsigned long long) le64_to_cpu(features_buf.incompat)); | |
3671 | ||
3672 | return 0; | |
3673 | } | |
3674 | ||
3675 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3676 | { | |
3677 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3678 | &rbd_dev->header.features); | |
3679 | } | |
3680 | ||
86b00e0d AE |
3681 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3682 | { | |
3683 | struct rbd_spec *parent_spec; | |
3684 | size_t size; | |
3685 | void *reply_buf = NULL; | |
3686 | __le64 snapid; | |
3687 | void *p; | |
3688 | void *end; | |
3689 | char *image_id; | |
3690 | u64 overlap; | |
86b00e0d AE |
3691 | int ret; |
3692 | ||
3693 | parent_spec = rbd_spec_alloc(); | |
3694 | if (!parent_spec) | |
3695 | return -ENOMEM; | |
3696 | ||
3697 | size = sizeof (__le64) + /* pool_id */ | |
3698 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3699 | sizeof (__le64) + /* snap_id */ | |
3700 | sizeof (__le64); /* overlap */ | |
3701 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3702 | if (!reply_buf) { | |
3703 | ret = -ENOMEM; | |
3704 | goto out_err; | |
3705 | } | |
3706 | ||
3707 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3708 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d AE |
3709 | "rbd", "get_parent", |
3710 | (char *) &snapid, sizeof (snapid), | |
07b2391f | 3711 | (char *) reply_buf, size, NULL); |
36be9a76 | 3712 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3713 | if (ret < 0) |
3714 | goto out_err; | |
3715 | ||
3716 | ret = -ERANGE; | |
3717 | p = reply_buf; | |
3718 | end = (char *) reply_buf + size; | |
3719 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); | |
3720 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3721 | goto out; /* No parent? No problem. */ | |
3722 | ||
0903e875 AE |
3723 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3724 | ||
3725 | ret = -EIO; | |
3726 | if (WARN_ON(parent_spec->pool_id > (u64) U32_MAX)) | |
3727 | goto out; | |
3728 | ||
979ed480 | 3729 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3730 | if (IS_ERR(image_id)) { |
3731 | ret = PTR_ERR(image_id); | |
3732 | goto out_err; | |
3733 | } | |
3734 | parent_spec->image_id = image_id; | |
3735 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3736 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3737 | ||
3738 | rbd_dev->parent_overlap = overlap; | |
3739 | rbd_dev->parent_spec = parent_spec; | |
3740 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3741 | out: | |
3742 | ret = 0; | |
3743 | out_err: | |
3744 | kfree(reply_buf); | |
3745 | rbd_spec_put(parent_spec); | |
3746 | ||
3747 | return ret; | |
3748 | } | |
3749 | ||
9e15b77d AE |
3750 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3751 | { | |
3752 | size_t image_id_size; | |
3753 | char *image_id; | |
3754 | void *p; | |
3755 | void *end; | |
3756 | size_t size; | |
3757 | void *reply_buf = NULL; | |
3758 | size_t len = 0; | |
3759 | char *image_name = NULL; | |
3760 | int ret; | |
3761 | ||
3762 | rbd_assert(!rbd_dev->spec->image_name); | |
3763 | ||
69e7a02f AE |
3764 | len = strlen(rbd_dev->spec->image_id); |
3765 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3766 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3767 | if (!image_id) | |
3768 | return NULL; | |
3769 | ||
3770 | p = image_id; | |
3771 | end = (char *) image_id + image_id_size; | |
69e7a02f | 3772 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len); |
9e15b77d AE |
3773 | |
3774 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3775 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3776 | if (!reply_buf) | |
3777 | goto out; | |
3778 | ||
36be9a76 | 3779 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3780 | "rbd", "dir_get_name", |
3781 | image_id, image_id_size, | |
07b2391f | 3782 | (char *) reply_buf, size, NULL); |
9e15b77d AE |
3783 | if (ret < 0) |
3784 | goto out; | |
3785 | p = reply_buf; | |
3786 | end = (char *) reply_buf + size; | |
3787 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); | |
3788 | if (IS_ERR(image_name)) | |
3789 | image_name = NULL; | |
3790 | else | |
3791 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3792 | out: | |
3793 | kfree(reply_buf); | |
3794 | kfree(image_id); | |
3795 | ||
3796 | return image_name; | |
3797 | } | |
3798 | ||
3799 | /* | |
3800 | * When a parent image gets probed, we only have the pool, image, | |
3801 | * and snapshot ids but not the names of any of them. This call | |
3802 | * is made later to fill in those names. It has to be done after | |
3803 | * rbd_dev_snaps_update() has completed because some of the | |
3804 | * information (in particular, snapshot name) is not available | |
3805 | * until then. | |
3806 | */ | |
3807 | static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) | |
3808 | { | |
3809 | struct ceph_osd_client *osdc; | |
3810 | const char *name; | |
3811 | void *reply_buf = NULL; | |
3812 | int ret; | |
3813 | ||
3814 | if (rbd_dev->spec->pool_name) | |
3815 | return 0; /* Already have the names */ | |
3816 | ||
3817 | /* Look up the pool name */ | |
3818 | ||
3819 | osdc = &rbd_dev->rbd_client->client->osdc; | |
3820 | name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); | |
935dc89f AE |
3821 | if (!name) { |
3822 | rbd_warn(rbd_dev, "there is no pool with id %llu", | |
3823 | rbd_dev->spec->pool_id); /* Really a BUG() */ | |
3824 | return -EIO; | |
3825 | } | |
9e15b77d AE |
3826 | |
3827 | rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); | |
3828 | if (!rbd_dev->spec->pool_name) | |
3829 | return -ENOMEM; | |
3830 | ||
3831 | /* Fetch the image name; tolerate failure here */ | |
3832 | ||
3833 | name = rbd_dev_image_name(rbd_dev); | |
69e7a02f | 3834 | if (name) |
9e15b77d | 3835 | rbd_dev->spec->image_name = (char *) name; |
69e7a02f | 3836 | else |
06ecc6cb | 3837 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d AE |
3838 | |
3839 | /* Look up the snapshot name. */ | |
3840 | ||
3841 | name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); | |
3842 | if (!name) { | |
935dc89f AE |
3843 | rbd_warn(rbd_dev, "no snapshot with id %llu", |
3844 | rbd_dev->spec->snap_id); /* Really a BUG() */ | |
9e15b77d AE |
3845 | ret = -EIO; |
3846 | goto out_err; | |
3847 | } | |
3848 | rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); | |
3849 | if(!rbd_dev->spec->snap_name) | |
3850 | goto out_err; | |
3851 | ||
3852 | return 0; | |
3853 | out_err: | |
3854 | kfree(reply_buf); | |
3855 | kfree(rbd_dev->spec->pool_name); | |
3856 | rbd_dev->spec->pool_name = NULL; | |
3857 | ||
3858 | return ret; | |
3859 | } | |
3860 | ||
6e14b1a6 | 3861 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
35d489f9 AE |
3862 | { |
3863 | size_t size; | |
3864 | int ret; | |
3865 | void *reply_buf; | |
3866 | void *p; | |
3867 | void *end; | |
3868 | u64 seq; | |
3869 | u32 snap_count; | |
3870 | struct ceph_snap_context *snapc; | |
3871 | u32 i; | |
3872 | ||
3873 | /* | |
3874 | * We'll need room for the seq value (maximum snapshot id), | |
3875 | * snapshot count, and array of that many snapshot ids. | |
3876 | * For now we have a fixed upper limit on the number we're | |
3877 | * prepared to receive. | |
3878 | */ | |
3879 | size = sizeof (__le64) + sizeof (__le32) + | |
3880 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3881 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3882 | if (!reply_buf) | |
3883 | return -ENOMEM; | |
3884 | ||
36be9a76 | 3885 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
35d489f9 AE |
3886 | "rbd", "get_snapcontext", |
3887 | NULL, 0, | |
07b2391f | 3888 | reply_buf, size, ver); |
36be9a76 | 3889 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3890 | if (ret < 0) |
3891 | goto out; | |
3892 | ||
3893 | ret = -ERANGE; | |
3894 | p = reply_buf; | |
3895 | end = (char *) reply_buf + size; | |
3896 | ceph_decode_64_safe(&p, end, seq, out); | |
3897 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3898 | ||
3899 | /* | |
3900 | * Make sure the reported number of snapshot ids wouldn't go | |
3901 | * beyond the end of our buffer. But before checking that, | |
3902 | * make sure the computed size of the snapshot context we | |
3903 | * allocate is representable in a size_t. | |
3904 | */ | |
3905 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3906 | / sizeof (u64)) { | |
3907 | ret = -EINVAL; | |
3908 | goto out; | |
3909 | } | |
3910 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3911 | goto out; | |
3912 | ||
3913 | size = sizeof (struct ceph_snap_context) + | |
3914 | snap_count * sizeof (snapc->snaps[0]); | |
3915 | snapc = kmalloc(size, GFP_KERNEL); | |
3916 | if (!snapc) { | |
3917 | ret = -ENOMEM; | |
3918 | goto out; | |
3919 | } | |
3920 | ||
3921 | atomic_set(&snapc->nref, 1); | |
3922 | snapc->seq = seq; | |
3923 | snapc->num_snaps = snap_count; | |
3924 | for (i = 0; i < snap_count; i++) | |
3925 | snapc->snaps[i] = ceph_decode_64(&p); | |
3926 | ||
3927 | rbd_dev->header.snapc = snapc; | |
3928 | ||
3929 | dout(" snap context seq = %llu, snap_count = %u\n", | |
3930 | (unsigned long long) seq, (unsigned int) snap_count); | |
3931 | ||
3932 | out: | |
3933 | kfree(reply_buf); | |
3934 | ||
3935 | return 0; | |
3936 | } | |
3937 | ||
b8b1e2db AE |
3938 | static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
3939 | { | |
3940 | size_t size; | |
3941 | void *reply_buf; | |
3942 | __le64 snap_id; | |
3943 | int ret; | |
3944 | void *p; | |
3945 | void *end; | |
b8b1e2db AE |
3946 | char *snap_name; |
3947 | ||
3948 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3949 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3950 | if (!reply_buf) | |
3951 | return ERR_PTR(-ENOMEM); | |
3952 | ||
3953 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); | |
36be9a76 | 3954 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db AE |
3955 | "rbd", "get_snapshot_name", |
3956 | (char *) &snap_id, sizeof (snap_id), | |
07b2391f | 3957 | reply_buf, size, NULL); |
36be9a76 | 3958 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b8b1e2db AE |
3959 | if (ret < 0) |
3960 | goto out; | |
3961 | ||
3962 | p = reply_buf; | |
3963 | end = (char *) reply_buf + size; | |
e5c35534 | 3964 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
b8b1e2db AE |
3965 | if (IS_ERR(snap_name)) { |
3966 | ret = PTR_ERR(snap_name); | |
3967 | goto out; | |
3968 | } else { | |
3969 | dout(" snap_id 0x%016llx snap_name = %s\n", | |
3970 | (unsigned long long) le64_to_cpu(snap_id), snap_name); | |
3971 | } | |
3972 | kfree(reply_buf); | |
3973 | ||
3974 | return snap_name; | |
3975 | out: | |
3976 | kfree(reply_buf); | |
3977 | ||
3978 | return ERR_PTR(ret); | |
3979 | } | |
3980 | ||
3981 | static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, | |
3982 | u64 *snap_size, u64 *snap_features) | |
3983 | { | |
e0b49868 | 3984 | u64 snap_id; |
b8b1e2db AE |
3985 | u8 order; |
3986 | int ret; | |
3987 | ||
3988 | snap_id = rbd_dev->header.snapc->snaps[which]; | |
3989 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); | |
3990 | if (ret) | |
3991 | return ERR_PTR(ret); | |
3992 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); | |
3993 | if (ret) | |
3994 | return ERR_PTR(ret); | |
3995 | ||
3996 | return rbd_dev_v2_snap_name(rbd_dev, which); | |
3997 | } | |
3998 | ||
3999 | static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, | |
4000 | u64 *snap_size, u64 *snap_features) | |
4001 | { | |
4002 | if (rbd_dev->image_format == 1) | |
4003 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
4004 | snap_size, snap_features); | |
4005 | if (rbd_dev->image_format == 2) | |
4006 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
4007 | snap_size, snap_features); | |
4008 | return ERR_PTR(-EINVAL); | |
4009 | } | |
4010 | ||
117973fb AE |
4011 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
4012 | { | |
4013 | int ret; | |
4014 | __u8 obj_order; | |
4015 | ||
4016 | down_write(&rbd_dev->header_rwsem); | |
4017 | ||
4018 | /* Grab old order first, to see if it changes */ | |
4019 | ||
4020 | obj_order = rbd_dev->header.obj_order, | |
4021 | ret = rbd_dev_v2_image_size(rbd_dev); | |
4022 | if (ret) | |
4023 | goto out; | |
4024 | if (rbd_dev->header.obj_order != obj_order) { | |
4025 | ret = -EIO; | |
4026 | goto out; | |
4027 | } | |
4028 | rbd_update_mapping_size(rbd_dev); | |
4029 | ||
4030 | ret = rbd_dev_v2_snap_context(rbd_dev, hver); | |
4031 | dout("rbd_dev_v2_snap_context returned %d\n", ret); | |
4032 | if (ret) | |
4033 | goto out; | |
4034 | ret = rbd_dev_snaps_update(rbd_dev); | |
4035 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
4036 | if (ret) | |
4037 | goto out; | |
4038 | ret = rbd_dev_snaps_register(rbd_dev); | |
4039 | dout("rbd_dev_snaps_register returned %d\n", ret); | |
4040 | out: | |
4041 | up_write(&rbd_dev->header_rwsem); | |
4042 | ||
4043 | return ret; | |
4044 | } | |
4045 | ||
dfc5606d | 4046 | /* |
35938150 AE |
4047 | * Scan the rbd device's current snapshot list and compare it to the |
4048 | * newly-received snapshot context. Remove any existing snapshots | |
4049 | * not present in the new snapshot context. Add a new snapshot for | |
4050 | * any snaphots in the snapshot context not in the current list. | |
4051 | * And verify there are no changes to snapshots we already know | |
4052 | * about. | |
4053 | * | |
4054 | * Assumes the snapshots in the snapshot context are sorted by | |
4055 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
4056 | * are also maintained in that order.) | |
dfc5606d | 4057 | */ |
304f6808 | 4058 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 4059 | { |
35938150 AE |
4060 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
4061 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
4062 | struct list_head *head = &rbd_dev->snaps; |
4063 | struct list_head *links = head->next; | |
4064 | u32 index = 0; | |
dfc5606d | 4065 | |
9fcbb800 | 4066 | dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
35938150 AE |
4067 | while (index < snap_count || links != head) { |
4068 | u64 snap_id; | |
4069 | struct rbd_snap *snap; | |
cd892126 AE |
4070 | char *snap_name; |
4071 | u64 snap_size = 0; | |
4072 | u64 snap_features = 0; | |
dfc5606d | 4073 | |
35938150 AE |
4074 | snap_id = index < snap_count ? snapc->snaps[index] |
4075 | : CEPH_NOSNAP; | |
4076 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
4077 | : NULL; | |
aafb230e | 4078 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 4079 | |
35938150 AE |
4080 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
4081 | struct list_head *next = links->next; | |
dfc5606d | 4082 | |
6d292906 AE |
4083 | /* |
4084 | * A previously-existing snapshot is not in | |
4085 | * the new snap context. | |
4086 | * | |
4087 | * If the now missing snapshot is the one the | |
4088 | * image is mapped to, clear its exists flag | |
4089 | * so we can avoid sending any more requests | |
4090 | * to it. | |
4091 | */ | |
0d7dbfce | 4092 | if (rbd_dev->spec->snap_id == snap->id) |
6d292906 | 4093 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
41f38c2b | 4094 | rbd_remove_snap_dev(snap); |
9fcbb800 | 4095 | dout("%ssnap id %llu has been removed\n", |
0d7dbfce AE |
4096 | rbd_dev->spec->snap_id == snap->id ? |
4097 | "mapped " : "", | |
9fcbb800 | 4098 | (unsigned long long) snap->id); |
35938150 AE |
4099 | |
4100 | /* Done with this list entry; advance */ | |
4101 | ||
4102 | links = next; | |
dfc5606d YS |
4103 | continue; |
4104 | } | |
35938150 | 4105 | |
b8b1e2db AE |
4106 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
4107 | &snap_size, &snap_features); | |
cd892126 AE |
4108 | if (IS_ERR(snap_name)) |
4109 | return PTR_ERR(snap_name); | |
4110 | ||
9fcbb800 AE |
4111 | dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
4112 | (unsigned long long) snap_id); | |
35938150 AE |
4113 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
4114 | struct rbd_snap *new_snap; | |
4115 | ||
4116 | /* We haven't seen this snapshot before */ | |
4117 | ||
c8d18425 | 4118 | new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
cd892126 | 4119 | snap_id, snap_size, snap_features); |
9fcbb800 AE |
4120 | if (IS_ERR(new_snap)) { |
4121 | int err = PTR_ERR(new_snap); | |
4122 | ||
4123 | dout(" failed to add dev, error %d\n", err); | |
4124 | ||
4125 | return err; | |
4126 | } | |
35938150 AE |
4127 | |
4128 | /* New goes before existing, or at end of list */ | |
4129 | ||
9fcbb800 | 4130 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
4131 | if (snap) |
4132 | list_add_tail(&new_snap->node, &snap->node); | |
4133 | else | |
523f3258 | 4134 | list_add_tail(&new_snap->node, head); |
35938150 AE |
4135 | } else { |
4136 | /* Already have this one */ | |
4137 | ||
9fcbb800 AE |
4138 | dout(" already present\n"); |
4139 | ||
cd892126 | 4140 | rbd_assert(snap->size == snap_size); |
aafb230e | 4141 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 4142 | rbd_assert(snap->features == snap_features); |
35938150 AE |
4143 | |
4144 | /* Done with this list entry; advance */ | |
4145 | ||
4146 | links = links->next; | |
dfc5606d | 4147 | } |
35938150 AE |
4148 | |
4149 | /* Advance to the next entry in the snapshot context */ | |
4150 | ||
4151 | index++; | |
dfc5606d | 4152 | } |
9fcbb800 | 4153 | dout("%s: done\n", __func__); |
dfc5606d YS |
4154 | |
4155 | return 0; | |
4156 | } | |
4157 | ||
304f6808 AE |
4158 | /* |
4159 | * Scan the list of snapshots and register the devices for any that | |
4160 | * have not already been registered. | |
4161 | */ | |
4162 | static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) | |
4163 | { | |
4164 | struct rbd_snap *snap; | |
4165 | int ret = 0; | |
4166 | ||
37206ee5 | 4167 | dout("%s:\n", __func__); |
86ff77bb AE |
4168 | if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
4169 | return -EIO; | |
304f6808 AE |
4170 | |
4171 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
4172 | if (!rbd_snap_registered(snap)) { | |
4173 | ret = rbd_register_snap_dev(snap, &rbd_dev->dev); | |
4174 | if (ret < 0) | |
4175 | break; | |
4176 | } | |
4177 | } | |
4178 | dout("%s: returning %d\n", __func__, ret); | |
4179 | ||
4180 | return ret; | |
4181 | } | |
4182 | ||
dfc5606d YS |
4183 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4184 | { | |
dfc5606d | 4185 | struct device *dev; |
cd789ab9 | 4186 | int ret; |
dfc5606d YS |
4187 | |
4188 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4189 | |
cd789ab9 | 4190 | dev = &rbd_dev->dev; |
dfc5606d YS |
4191 | dev->bus = &rbd_bus_type; |
4192 | dev->type = &rbd_device_type; | |
4193 | dev->parent = &rbd_root_dev; | |
4194 | dev->release = rbd_dev_release; | |
de71a297 | 4195 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4196 | ret = device_register(dev); |
dfc5606d | 4197 | |
dfc5606d | 4198 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4199 | |
dfc5606d | 4200 | return ret; |
602adf40 YS |
4201 | } |
4202 | ||
dfc5606d YS |
4203 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4204 | { | |
4205 | device_unregister(&rbd_dev->dev); | |
4206 | } | |
4207 | ||
e2839308 | 4208 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4209 | |
4210 | /* | |
499afd5b AE |
4211 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4212 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4213 | */ |
e2839308 | 4214 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4215 | { |
e2839308 | 4216 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4217 | |
4218 | spin_lock(&rbd_dev_list_lock); | |
4219 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4220 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4221 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4222 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4223 | } |
b7f23c36 | 4224 | |
1ddbe94e | 4225 | /* |
499afd5b AE |
4226 | * Remove an rbd_dev from the global list, and record that its |
4227 | * identifier is no longer in use. | |
1ddbe94e | 4228 | */ |
e2839308 | 4229 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4230 | { |
d184f6bf | 4231 | struct list_head *tmp; |
de71a297 | 4232 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4233 | int max_id; |
4234 | ||
aafb230e | 4235 | rbd_assert(rbd_id > 0); |
499afd5b | 4236 | |
e2839308 AE |
4237 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4238 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4239 | spin_lock(&rbd_dev_list_lock); |
4240 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4241 | |
4242 | /* | |
4243 | * If the id being "put" is not the current maximum, there | |
4244 | * is nothing special we need to do. | |
4245 | */ | |
e2839308 | 4246 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4247 | spin_unlock(&rbd_dev_list_lock); |
4248 | return; | |
4249 | } | |
4250 | ||
4251 | /* | |
4252 | * We need to update the current maximum id. Search the | |
4253 | * list to find out what it is. We're more likely to find | |
4254 | * the maximum at the end, so search the list backward. | |
4255 | */ | |
4256 | max_id = 0; | |
4257 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4258 | struct rbd_device *rbd_dev; | |
4259 | ||
4260 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4261 | if (rbd_dev->dev_id > max_id) |
4262 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4263 | } |
499afd5b | 4264 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4265 | |
1ddbe94e | 4266 | /* |
e2839308 | 4267 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4268 | * which case it now accurately reflects the new maximum. |
4269 | * Be careful not to overwrite the maximum value in that | |
4270 | * case. | |
1ddbe94e | 4271 | */ |
e2839308 AE |
4272 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4273 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4274 | } |
4275 | ||
e28fff26 AE |
4276 | /* |
4277 | * Skips over white space at *buf, and updates *buf to point to the | |
4278 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4279 | * the token (string of non-white space characters) found. Note |
4280 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4281 | */ |
4282 | static inline size_t next_token(const char **buf) | |
4283 | { | |
4284 | /* | |
4285 | * These are the characters that produce nonzero for | |
4286 | * isspace() in the "C" and "POSIX" locales. | |
4287 | */ | |
4288 | const char *spaces = " \f\n\r\t\v"; | |
4289 | ||
4290 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4291 | ||
4292 | return strcspn(*buf, spaces); /* Return token length */ | |
4293 | } | |
4294 | ||
4295 | /* | |
4296 | * Finds the next token in *buf, and if the provided token buffer is | |
4297 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4298 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4299 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4300 | * |
4301 | * Returns the length of the token found (not including the '\0'). | |
4302 | * Return value will be 0 if no token is found, and it will be >= | |
4303 | * token_size if the token would not fit. | |
4304 | * | |
593a9e7b | 4305 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4306 | * found token. Note that this occurs even if the token buffer is |
4307 | * too small to hold it. | |
4308 | */ | |
4309 | static inline size_t copy_token(const char **buf, | |
4310 | char *token, | |
4311 | size_t token_size) | |
4312 | { | |
4313 | size_t len; | |
4314 | ||
4315 | len = next_token(buf); | |
4316 | if (len < token_size) { | |
4317 | memcpy(token, *buf, len); | |
4318 | *(token + len) = '\0'; | |
4319 | } | |
4320 | *buf += len; | |
4321 | ||
4322 | return len; | |
4323 | } | |
4324 | ||
ea3352f4 AE |
4325 | /* |
4326 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4327 | * enough to hold a copy of it, and copies the token into the new | |
4328 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4329 | * that a duplicate buffer is created even for a zero-length token. | |
4330 | * | |
4331 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4332 | * pointer if memory for the duplicate was not available. If | |
4333 | * the lenp argument is a non-null pointer, the length of the token | |
4334 | * (not including the '\0') is returned in *lenp. | |
4335 | * | |
4336 | * If successful, the *buf pointer will be updated to point beyond | |
4337 | * the end of the found token. | |
4338 | * | |
4339 | * Note: uses GFP_KERNEL for allocation. | |
4340 | */ | |
4341 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4342 | { | |
4343 | char *dup; | |
4344 | size_t len; | |
4345 | ||
4346 | len = next_token(buf); | |
4caf35f9 | 4347 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4348 | if (!dup) |
4349 | return NULL; | |
ea3352f4 AE |
4350 | *(dup + len) = '\0'; |
4351 | *buf += len; | |
4352 | ||
4353 | if (lenp) | |
4354 | *lenp = len; | |
4355 | ||
4356 | return dup; | |
4357 | } | |
4358 | ||
a725f65e | 4359 | /* |
859c31df AE |
4360 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4361 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4362 | * and the data written is passed here via a NUL-terminated buffer. | |
4363 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4364 | * |
859c31df AE |
4365 | * The information extracted from these options is recorded in |
4366 | * the other parameters which return dynamically-allocated | |
4367 | * structures: | |
4368 | * ceph_opts | |
4369 | * The address of a pointer that will refer to a ceph options | |
4370 | * structure. Caller must release the returned pointer using | |
4371 | * ceph_destroy_options() when it is no longer needed. | |
4372 | * rbd_opts | |
4373 | * Address of an rbd options pointer. Fully initialized by | |
4374 | * this function; caller must release with kfree(). | |
4375 | * spec | |
4376 | * Address of an rbd image specification pointer. Fully | |
4377 | * initialized by this function based on parsed options. | |
4378 | * Caller must release with rbd_spec_put(). | |
4379 | * | |
4380 | * The options passed take this form: | |
4381 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4382 | * where: | |
4383 | * <mon_addrs> | |
4384 | * A comma-separated list of one or more monitor addresses. | |
4385 | * A monitor address is an ip address, optionally followed | |
4386 | * by a port number (separated by a colon). | |
4387 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4388 | * <options> | |
4389 | * A comma-separated list of ceph and/or rbd options. | |
4390 | * <pool_name> | |
4391 | * The name of the rados pool containing the rbd image. | |
4392 | * <image_name> | |
4393 | * The name of the image in that pool to map. | |
4394 | * <snap_id> | |
4395 | * An optional snapshot id. If provided, the mapping will | |
4396 | * present data from the image at the time that snapshot was | |
4397 | * created. The image head is used if no snapshot id is | |
4398 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4399 | */ |
859c31df | 4400 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4401 | struct ceph_options **ceph_opts, |
859c31df AE |
4402 | struct rbd_options **opts, |
4403 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4404 | { |
d22f76e7 | 4405 | size_t len; |
859c31df | 4406 | char *options; |
0ddebc0c AE |
4407 | const char *mon_addrs; |
4408 | size_t mon_addrs_size; | |
859c31df | 4409 | struct rbd_spec *spec = NULL; |
4e9afeba | 4410 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4411 | struct ceph_options *copts; |
dc79b113 | 4412 | int ret; |
e28fff26 AE |
4413 | |
4414 | /* The first four tokens are required */ | |
4415 | ||
7ef3214a | 4416 | len = next_token(&buf); |
4fb5d671 AE |
4417 | if (!len) { |
4418 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4419 | return -EINVAL; | |
4420 | } | |
0ddebc0c | 4421 | mon_addrs = buf; |
f28e565a | 4422 | mon_addrs_size = len + 1; |
7ef3214a | 4423 | buf += len; |
a725f65e | 4424 | |
dc79b113 | 4425 | ret = -EINVAL; |
f28e565a AE |
4426 | options = dup_token(&buf, NULL); |
4427 | if (!options) | |
dc79b113 | 4428 | return -ENOMEM; |
4fb5d671 AE |
4429 | if (!*options) { |
4430 | rbd_warn(NULL, "no options provided"); | |
4431 | goto out_err; | |
4432 | } | |
e28fff26 | 4433 | |
859c31df AE |
4434 | spec = rbd_spec_alloc(); |
4435 | if (!spec) | |
f28e565a | 4436 | goto out_mem; |
859c31df AE |
4437 | |
4438 | spec->pool_name = dup_token(&buf, NULL); | |
4439 | if (!spec->pool_name) | |
4440 | goto out_mem; | |
4fb5d671 AE |
4441 | if (!*spec->pool_name) { |
4442 | rbd_warn(NULL, "no pool name provided"); | |
4443 | goto out_err; | |
4444 | } | |
e28fff26 | 4445 | |
69e7a02f | 4446 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4447 | if (!spec->image_name) |
f28e565a | 4448 | goto out_mem; |
4fb5d671 AE |
4449 | if (!*spec->image_name) { |
4450 | rbd_warn(NULL, "no image name provided"); | |
4451 | goto out_err; | |
4452 | } | |
d4b125e9 | 4453 | |
f28e565a AE |
4454 | /* |
4455 | * Snapshot name is optional; default is to use "-" | |
4456 | * (indicating the head/no snapshot). | |
4457 | */ | |
3feeb894 | 4458 | len = next_token(&buf); |
820a5f3e | 4459 | if (!len) { |
3feeb894 AE |
4460 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4461 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4462 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4463 | ret = -ENAMETOOLONG; |
f28e565a | 4464 | goto out_err; |
849b4260 | 4465 | } |
4caf35f9 | 4466 | spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
859c31df | 4467 | if (!spec->snap_name) |
f28e565a | 4468 | goto out_mem; |
859c31df | 4469 | *(spec->snap_name + len) = '\0'; |
e5c35534 | 4470 | |
0ddebc0c | 4471 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4472 | |
4e9afeba AE |
4473 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4474 | if (!rbd_opts) | |
4475 | goto out_mem; | |
4476 | ||
4477 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4478 | |
859c31df | 4479 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4480 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4481 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4482 | if (IS_ERR(copts)) { |
4483 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4484 | goto out_err; |
4485 | } | |
859c31df AE |
4486 | kfree(options); |
4487 | ||
4488 | *ceph_opts = copts; | |
4e9afeba | 4489 | *opts = rbd_opts; |
859c31df | 4490 | *rbd_spec = spec; |
0ddebc0c | 4491 | |
dc79b113 | 4492 | return 0; |
f28e565a | 4493 | out_mem: |
dc79b113 | 4494 | ret = -ENOMEM; |
d22f76e7 | 4495 | out_err: |
859c31df AE |
4496 | kfree(rbd_opts); |
4497 | rbd_spec_put(spec); | |
f28e565a | 4498 | kfree(options); |
d22f76e7 | 4499 | |
dc79b113 | 4500 | return ret; |
a725f65e AE |
4501 | } |
4502 | ||
589d30e0 AE |
4503 | /* |
4504 | * An rbd format 2 image has a unique identifier, distinct from the | |
4505 | * name given to it by the user. Internally, that identifier is | |
4506 | * what's used to specify the names of objects related to the image. | |
4507 | * | |
4508 | * A special "rbd id" object is used to map an rbd image name to its | |
4509 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4510 | * with the supplied name. | |
4511 | * | |
4512 | * This function will record the given rbd_dev's image_id field if | |
4513 | * it can be determined, and in that case will return 0. If any | |
4514 | * errors occur a negative errno will be returned and the rbd_dev's | |
4515 | * image_id field will be unchanged (and should be NULL). | |
4516 | */ | |
4517 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4518 | { | |
4519 | int ret; | |
4520 | size_t size; | |
4521 | char *object_name; | |
4522 | void *response; | |
4523 | void *p; | |
4524 | ||
2f82ee54 AE |
4525 | /* If we already have it we don't need to look it up */ |
4526 | ||
4527 | if (rbd_dev->spec->image_id) | |
4528 | return 0; | |
4529 | ||
2c0d0a10 AE |
4530 | /* |
4531 | * When probing a parent image, the image id is already | |
4532 | * known (and the image name likely is not). There's no | |
4533 | * need to fetch the image id again in this case. | |
4534 | */ | |
4535 | if (rbd_dev->spec->image_id) | |
4536 | return 0; | |
4537 | ||
589d30e0 AE |
4538 | /* |
4539 | * First, see if the format 2 image id file exists, and if | |
4540 | * so, get the image's persistent id from it. | |
4541 | */ | |
69e7a02f | 4542 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4543 | object_name = kmalloc(size, GFP_NOIO); |
4544 | if (!object_name) | |
4545 | return -ENOMEM; | |
0d7dbfce | 4546 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4547 | dout("rbd id object name is %s\n", object_name); |
4548 | ||
4549 | /* Response will be an encoded string, which includes a length */ | |
4550 | ||
4551 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4552 | response = kzalloc(size, GFP_NOIO); | |
4553 | if (!response) { | |
4554 | ret = -ENOMEM; | |
4555 | goto out; | |
4556 | } | |
4557 | ||
36be9a76 | 4558 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
589d30e0 AE |
4559 | "rbd", "get_id", |
4560 | NULL, 0, | |
07b2391f | 4561 | response, RBD_IMAGE_ID_LEN_MAX, NULL); |
36be9a76 | 4562 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
589d30e0 AE |
4563 | if (ret < 0) |
4564 | goto out; | |
4565 | ||
4566 | p = response; | |
0d7dbfce | 4567 | rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, |
589d30e0 | 4568 | p + RBD_IMAGE_ID_LEN_MAX, |
979ed480 | 4569 | NULL, GFP_NOIO); |
0d7dbfce AE |
4570 | if (IS_ERR(rbd_dev->spec->image_id)) { |
4571 | ret = PTR_ERR(rbd_dev->spec->image_id); | |
4572 | rbd_dev->spec->image_id = NULL; | |
589d30e0 | 4573 | } else { |
0d7dbfce | 4574 | dout("image_id is %s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
4575 | } |
4576 | out: | |
4577 | kfree(response); | |
4578 | kfree(object_name); | |
4579 | ||
4580 | return ret; | |
4581 | } | |
4582 | ||
a30b71b9 AE |
4583 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4584 | { | |
4585 | int ret; | |
4586 | size_t size; | |
4587 | ||
4588 | /* Version 1 images have no id; empty string is used */ | |
4589 | ||
0d7dbfce AE |
4590 | rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); |
4591 | if (!rbd_dev->spec->image_id) | |
a30b71b9 | 4592 | return -ENOMEM; |
a30b71b9 AE |
4593 | |
4594 | /* Record the header object name for this rbd image. */ | |
4595 | ||
69e7a02f | 4596 | size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); |
a30b71b9 AE |
4597 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
4598 | if (!rbd_dev->header_name) { | |
4599 | ret = -ENOMEM; | |
4600 | goto out_err; | |
4601 | } | |
0d7dbfce AE |
4602 | sprintf(rbd_dev->header_name, "%s%s", |
4603 | rbd_dev->spec->image_name, RBD_SUFFIX); | |
a30b71b9 AE |
4604 | |
4605 | /* Populate rbd image metadata */ | |
4606 | ||
4607 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4608 | if (ret < 0) | |
4609 | goto out_err; | |
86b00e0d AE |
4610 | |
4611 | /* Version 1 images have no parent (no layering) */ | |
4612 | ||
4613 | rbd_dev->parent_spec = NULL; | |
4614 | rbd_dev->parent_overlap = 0; | |
4615 | ||
a30b71b9 AE |
4616 | rbd_dev->image_format = 1; |
4617 | ||
4618 | dout("discovered version 1 image, header name is %s\n", | |
4619 | rbd_dev->header_name); | |
4620 | ||
4621 | return 0; | |
4622 | ||
4623 | out_err: | |
4624 | kfree(rbd_dev->header_name); | |
4625 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4626 | kfree(rbd_dev->spec->image_id); |
4627 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4628 | |
4629 | return ret; | |
4630 | } | |
4631 | ||
4632 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4633 | { | |
4634 | size_t size; | |
9d475de5 | 4635 | int ret; |
6e14b1a6 | 4636 | u64 ver = 0; |
a30b71b9 AE |
4637 | |
4638 | /* | |
4639 | * Image id was filled in by the caller. Record the header | |
4640 | * object name for this rbd image. | |
4641 | */ | |
979ed480 | 4642 | size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); |
a30b71b9 AE |
4643 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
4644 | if (!rbd_dev->header_name) | |
4645 | return -ENOMEM; | |
4646 | sprintf(rbd_dev->header_name, "%s%s", | |
0d7dbfce | 4647 | RBD_HEADER_PREFIX, rbd_dev->spec->image_id); |
9d475de5 AE |
4648 | |
4649 | /* Get the size and object order for the image */ | |
4650 | ||
4651 | ret = rbd_dev_v2_image_size(rbd_dev); | |
1e130199 AE |
4652 | if (ret < 0) |
4653 | goto out_err; | |
4654 | ||
4655 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4656 | ||
4657 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
b1b5402a AE |
4658 | if (ret < 0) |
4659 | goto out_err; | |
4660 | ||
d889140c | 4661 | /* Get the and check features for the image */ |
b1b5402a AE |
4662 | |
4663 | ret = rbd_dev_v2_features(rbd_dev); | |
9d475de5 AE |
4664 | if (ret < 0) |
4665 | goto out_err; | |
35d489f9 | 4666 | |
86b00e0d AE |
4667 | /* If the image supports layering, get the parent info */ |
4668 | ||
4669 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4670 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4671 | if (ret < 0) | |
4672 | goto out_err; | |
4673 | } | |
4674 | ||
6e14b1a6 AE |
4675 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4676 | ||
4677 | rbd_dev->header.crypt_type = 0; | |
4678 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4679 | |
6e14b1a6 AE |
4680 | /* Get the snapshot context, plus the header version */ |
4681 | ||
4682 | ret = rbd_dev_v2_snap_context(rbd_dev, &ver); | |
35d489f9 AE |
4683 | if (ret) |
4684 | goto out_err; | |
6e14b1a6 AE |
4685 | rbd_dev->header.obj_version = ver; |
4686 | ||
a30b71b9 AE |
4687 | rbd_dev->image_format = 2; |
4688 | ||
4689 | dout("discovered version 2 image, header name is %s\n", | |
4690 | rbd_dev->header_name); | |
4691 | ||
35152979 | 4692 | return 0; |
9d475de5 | 4693 | out_err: |
86b00e0d AE |
4694 | rbd_dev->parent_overlap = 0; |
4695 | rbd_spec_put(rbd_dev->parent_spec); | |
4696 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4697 | kfree(rbd_dev->header_name); |
4698 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4699 | kfree(rbd_dev->header.object_prefix); |
4700 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4701 | |
4702 | return ret; | |
a30b71b9 AE |
4703 | } |
4704 | ||
83a06263 AE |
4705 | static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) |
4706 | { | |
2f82ee54 AE |
4707 | struct rbd_device *parent = NULL; |
4708 | struct rbd_spec *parent_spec = NULL; | |
4709 | struct rbd_client *rbdc = NULL; | |
83a06263 AE |
4710 | int ret; |
4711 | ||
4712 | /* no need to lock here, as rbd_dev is not registered yet */ | |
4713 | ret = rbd_dev_snaps_update(rbd_dev); | |
4714 | if (ret) | |
4715 | return ret; | |
4716 | ||
9e15b77d AE |
4717 | ret = rbd_dev_probe_update_spec(rbd_dev); |
4718 | if (ret) | |
4719 | goto err_out_snaps; | |
4720 | ||
83a06263 AE |
4721 | ret = rbd_dev_set_mapping(rbd_dev); |
4722 | if (ret) | |
4723 | goto err_out_snaps; | |
4724 | ||
4725 | /* generate unique id: find highest unique id, add one */ | |
4726 | rbd_dev_id_get(rbd_dev); | |
4727 | ||
4728 | /* Fill in the device name, now that we have its id. */ | |
4729 | BUILD_BUG_ON(DEV_NAME_LEN | |
4730 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4731 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4732 | ||
4733 | /* Get our block major device number. */ | |
4734 | ||
4735 | ret = register_blkdev(0, rbd_dev->name); | |
4736 | if (ret < 0) | |
4737 | goto err_out_id; | |
4738 | rbd_dev->major = ret; | |
4739 | ||
4740 | /* Set up the blkdev mapping. */ | |
4741 | ||
4742 | ret = rbd_init_disk(rbd_dev); | |
4743 | if (ret) | |
4744 | goto err_out_blkdev; | |
4745 | ||
4746 | ret = rbd_bus_add_dev(rbd_dev); | |
4747 | if (ret) | |
4748 | goto err_out_disk; | |
4749 | ||
4750 | /* | |
4751 | * At this point cleanup in the event of an error is the job | |
4752 | * of the sysfs code (initiated by rbd_bus_del_dev()). | |
4753 | */ | |
2f82ee54 AE |
4754 | /* Probe the parent if there is one */ |
4755 | ||
4756 | if (rbd_dev->parent_spec) { | |
4757 | /* | |
4758 | * We need to pass a reference to the client and the | |
4759 | * parent spec when creating the parent rbd_dev. | |
4760 | * Images related by parent/child relationships | |
4761 | * always share both. | |
4762 | */ | |
4763 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4764 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4765 | ||
4766 | parent = rbd_dev_create(rbdc, parent_spec); | |
4767 | if (!parent) { | |
4768 | ret = -ENOMEM; | |
4769 | goto err_out_spec; | |
4770 | } | |
4771 | rbdc = NULL; /* parent now owns reference */ | |
4772 | parent_spec = NULL; /* parent now owns reference */ | |
4773 | ret = rbd_dev_probe(parent); | |
4774 | if (ret < 0) | |
4775 | goto err_out_parent; | |
4776 | rbd_dev->parent = parent; | |
4777 | } | |
4778 | ||
83a06263 AE |
4779 | down_write(&rbd_dev->header_rwsem); |
4780 | ret = rbd_dev_snaps_register(rbd_dev); | |
4781 | up_write(&rbd_dev->header_rwsem); | |
4782 | if (ret) | |
4783 | goto err_out_bus; | |
4784 | ||
9969ebc5 | 4785 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
83a06263 AE |
4786 | if (ret) |
4787 | goto err_out_bus; | |
4788 | ||
4789 | /* Everything's ready. Announce the disk to the world. */ | |
4790 | ||
4791 | add_disk(rbd_dev->disk); | |
4792 | ||
4793 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4794 | (unsigned long long) rbd_dev->mapping.size); | |
4795 | ||
4796 | return ret; | |
2f82ee54 AE |
4797 | |
4798 | err_out_parent: | |
4799 | rbd_dev_destroy(parent); | |
4800 | err_out_spec: | |
4801 | rbd_spec_put(parent_spec); | |
4802 | rbd_put_client(rbdc); | |
83a06263 AE |
4803 | err_out_bus: |
4804 | /* this will also clean up rest of rbd_dev stuff */ | |
4805 | ||
4806 | rbd_bus_del_dev(rbd_dev); | |
4807 | ||
4808 | return ret; | |
4809 | err_out_disk: | |
4810 | rbd_free_disk(rbd_dev); | |
4811 | err_out_blkdev: | |
4812 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4813 | err_out_id: | |
4814 | rbd_dev_id_put(rbd_dev); | |
4815 | err_out_snaps: | |
4816 | rbd_remove_all_snaps(rbd_dev); | |
4817 | ||
4818 | return ret; | |
4819 | } | |
4820 | ||
a30b71b9 AE |
4821 | /* |
4822 | * Probe for the existence of the header object for the given rbd | |
4823 | * device. For format 2 images this includes determining the image | |
4824 | * id. | |
4825 | */ | |
4826 | static int rbd_dev_probe(struct rbd_device *rbd_dev) | |
4827 | { | |
4828 | int ret; | |
4829 | ||
4830 | /* | |
4831 | * Get the id from the image id object. If it's not a | |
4832 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4833 | * it's a format 1 image. | |
4834 | */ | |
4835 | ret = rbd_dev_image_id(rbd_dev); | |
4836 | if (ret) | |
4837 | ret = rbd_dev_v1_probe(rbd_dev); | |
4838 | else | |
4839 | ret = rbd_dev_v2_probe(rbd_dev); | |
83a06263 | 4840 | if (ret) { |
a30b71b9 AE |
4841 | dout("probe failed, returning %d\n", ret); |
4842 | ||
83a06263 AE |
4843 | return ret; |
4844 | } | |
4845 | ||
4846 | ret = rbd_dev_probe_finish(rbd_dev); | |
4847 | if (ret) | |
4848 | rbd_header_free(&rbd_dev->header); | |
4849 | ||
a30b71b9 AE |
4850 | return ret; |
4851 | } | |
4852 | ||
59c2be1e YS |
4853 | static ssize_t rbd_add(struct bus_type *bus, |
4854 | const char *buf, | |
4855 | size_t count) | |
602adf40 | 4856 | { |
cb8627c7 | 4857 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4858 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4859 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4860 | struct rbd_spec *spec = NULL; |
9d3997fd | 4861 | struct rbd_client *rbdc; |
27cc2594 AE |
4862 | struct ceph_osd_client *osdc; |
4863 | int rc = -ENOMEM; | |
602adf40 YS |
4864 | |
4865 | if (!try_module_get(THIS_MODULE)) | |
4866 | return -ENODEV; | |
4867 | ||
602adf40 | 4868 | /* parse add command */ |
859c31df | 4869 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4870 | if (rc < 0) |
bd4ba655 | 4871 | goto err_out_module; |
78cea76e | 4872 | |
9d3997fd AE |
4873 | rbdc = rbd_get_client(ceph_opts); |
4874 | if (IS_ERR(rbdc)) { | |
4875 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4876 | goto err_out_args; |
9d3997fd | 4877 | } |
c53d5893 | 4878 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4879 | |
602adf40 | 4880 | /* pick the pool */ |
9d3997fd | 4881 | osdc = &rbdc->client->osdc; |
859c31df | 4882 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4883 | if (rc < 0) |
4884 | goto err_out_client; | |
859c31df AE |
4885 | spec->pool_id = (u64) rc; |
4886 | ||
0903e875 AE |
4887 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4888 | ||
4889 | if (WARN_ON(spec->pool_id > (u64) U32_MAX)) { | |
4890 | rc = -EIO; | |
4891 | goto err_out_client; | |
4892 | } | |
4893 | ||
c53d5893 | 4894 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4895 | if (!rbd_dev) |
4896 | goto err_out_client; | |
c53d5893 AE |
4897 | rbdc = NULL; /* rbd_dev now owns this */ |
4898 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4899 | |
bd4ba655 | 4900 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4901 | kfree(rbd_opts); |
4902 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4903 | |
a30b71b9 AE |
4904 | rc = rbd_dev_probe(rbd_dev); |
4905 | if (rc < 0) | |
c53d5893 | 4906 | goto err_out_rbd_dev; |
05fd6f6f | 4907 | |
602adf40 | 4908 | return count; |
c53d5893 AE |
4909 | err_out_rbd_dev: |
4910 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4911 | err_out_client: |
9d3997fd | 4912 | rbd_put_client(rbdc); |
0ddebc0c | 4913 | err_out_args: |
78cea76e AE |
4914 | if (ceph_opts) |
4915 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4916 | kfree(rbd_opts); |
859c31df | 4917 | rbd_spec_put(spec); |
bd4ba655 AE |
4918 | err_out_module: |
4919 | module_put(THIS_MODULE); | |
27cc2594 | 4920 | |
602adf40 | 4921 | dout("Error adding device %s\n", buf); |
27cc2594 AE |
4922 | |
4923 | return (ssize_t) rc; | |
602adf40 YS |
4924 | } |
4925 | ||
de71a297 | 4926 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4927 | { |
4928 | struct list_head *tmp; | |
4929 | struct rbd_device *rbd_dev; | |
4930 | ||
e124a82f | 4931 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4932 | list_for_each(tmp, &rbd_dev_list) { |
4933 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4934 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4935 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4936 | return rbd_dev; |
e124a82f | 4937 | } |
602adf40 | 4938 | } |
e124a82f | 4939 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4940 | return NULL; |
4941 | } | |
4942 | ||
dfc5606d | 4943 | static void rbd_dev_release(struct device *dev) |
602adf40 | 4944 | { |
593a9e7b | 4945 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4946 | |
59c2be1e | 4947 | if (rbd_dev->watch_event) |
9969ebc5 | 4948 | rbd_dev_header_watch_sync(rbd_dev, 0); |
602adf40 YS |
4949 | |
4950 | /* clean up and free blkdev */ | |
4951 | rbd_free_disk(rbd_dev); | |
4952 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
32eec68d | 4953 | |
2ac4e75d AE |
4954 | /* release allocated disk header fields */ |
4955 | rbd_header_free(&rbd_dev->header); | |
4956 | ||
32eec68d | 4957 | /* done with the id, and with the rbd_dev */ |
e2839308 | 4958 | rbd_dev_id_put(rbd_dev); |
c53d5893 AE |
4959 | rbd_assert(rbd_dev->rbd_client != NULL); |
4960 | rbd_dev_destroy(rbd_dev); | |
602adf40 YS |
4961 | |
4962 | /* release module ref */ | |
4963 | module_put(THIS_MODULE); | |
602adf40 YS |
4964 | } |
4965 | ||
2f82ee54 AE |
4966 | static void __rbd_remove(struct rbd_device *rbd_dev) |
4967 | { | |
4968 | rbd_remove_all_snaps(rbd_dev); | |
4969 | rbd_bus_del_dev(rbd_dev); | |
4970 | } | |
4971 | ||
dfc5606d YS |
4972 | static ssize_t rbd_remove(struct bus_type *bus, |
4973 | const char *buf, | |
4974 | size_t count) | |
602adf40 YS |
4975 | { |
4976 | struct rbd_device *rbd_dev = NULL; | |
4977 | int target_id, rc; | |
4978 | unsigned long ul; | |
4979 | int ret = count; | |
4980 | ||
4981 | rc = strict_strtoul(buf, 10, &ul); | |
4982 | if (rc) | |
4983 | return rc; | |
4984 | ||
4985 | /* convert to int; abort if we lost anything in the conversion */ | |
4986 | target_id = (int) ul; | |
4987 | if (target_id != ul) | |
4988 | return -EINVAL; | |
4989 | ||
4990 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
4991 | ||
4992 | rbd_dev = __rbd_get_dev(target_id); | |
4993 | if (!rbd_dev) { | |
4994 | ret = -ENOENT; | |
4995 | goto done; | |
42382b70 AE |
4996 | } |
4997 | ||
a14ea269 | 4998 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 4999 | if (rbd_dev->open_count) |
42382b70 | 5000 | ret = -EBUSY; |
b82d167b AE |
5001 | else |
5002 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 5003 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 5004 | if (ret < 0) |
42382b70 | 5005 | goto done; |
602adf40 | 5006 | |
2f82ee54 AE |
5007 | while (rbd_dev->parent_spec) { |
5008 | struct rbd_device *first = rbd_dev; | |
5009 | struct rbd_device *second = first->parent; | |
5010 | struct rbd_device *third; | |
5011 | ||
5012 | /* | |
5013 | * Follow to the parent with no grandparent and | |
5014 | * remove it. | |
5015 | */ | |
5016 | while (second && (third = second->parent)) { | |
5017 | first = second; | |
5018 | second = third; | |
5019 | } | |
5020 | __rbd_remove(second); | |
5021 | rbd_spec_put(first->parent_spec); | |
5022 | first->parent_spec = NULL; | |
5023 | first->parent_overlap = 0; | |
5024 | first->parent = NULL; | |
5025 | } | |
5026 | __rbd_remove(rbd_dev); | |
602adf40 YS |
5027 | |
5028 | done: | |
5029 | mutex_unlock(&ctl_mutex); | |
aafb230e | 5030 | |
602adf40 YS |
5031 | return ret; |
5032 | } | |
5033 | ||
602adf40 YS |
5034 | /* |
5035 | * create control files in sysfs | |
dfc5606d | 5036 | * /sys/bus/rbd/... |
602adf40 YS |
5037 | */ |
5038 | static int rbd_sysfs_init(void) | |
5039 | { | |
dfc5606d | 5040 | int ret; |
602adf40 | 5041 | |
fed4c143 | 5042 | ret = device_register(&rbd_root_dev); |
21079786 | 5043 | if (ret < 0) |
dfc5606d | 5044 | return ret; |
602adf40 | 5045 | |
fed4c143 AE |
5046 | ret = bus_register(&rbd_bus_type); |
5047 | if (ret < 0) | |
5048 | device_unregister(&rbd_root_dev); | |
602adf40 | 5049 | |
602adf40 YS |
5050 | return ret; |
5051 | } | |
5052 | ||
5053 | static void rbd_sysfs_cleanup(void) | |
5054 | { | |
dfc5606d | 5055 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5056 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5057 | } |
5058 | ||
cc344fa1 | 5059 | static int __init rbd_init(void) |
602adf40 YS |
5060 | { |
5061 | int rc; | |
5062 | ||
1e32d34c AE |
5063 | if (!libceph_compatible(NULL)) { |
5064 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
5065 | ||
5066 | return -EINVAL; | |
5067 | } | |
602adf40 YS |
5068 | rc = rbd_sysfs_init(); |
5069 | if (rc) | |
5070 | return rc; | |
f0f8cef5 | 5071 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
5072 | return 0; |
5073 | } | |
5074 | ||
cc344fa1 | 5075 | static void __exit rbd_exit(void) |
602adf40 YS |
5076 | { |
5077 | rbd_sysfs_cleanup(); | |
5078 | } | |
5079 | ||
5080 | module_init(rbd_init); | |
5081 | module_exit(rbd_exit); | |
5082 | ||
5083 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
5084 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
5085 | MODULE_DESCRIPTION("rados block device"); | |
5086 | ||
5087 | /* following authorship retained from original osdblk.c */ | |
5088 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5089 | ||
5090 | MODULE_LICENSE("GPL"); |