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Commit | Line | Data |
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602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
aafb230e AE |
44 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
45 | ||
593a9e7b AE |
46 | /* |
47 | * The basic unit of block I/O is a sector. It is interpreted in a | |
48 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
49 | * universally 512 bytes. These symbols are just slightly more | |
50 | * meaningful than the bare numbers they represent. | |
51 | */ | |
52 | #define SECTOR_SHIFT 9 | |
53 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
54 | ||
f0f8cef5 AE |
55 | #define RBD_DRV_NAME "rbd" |
56 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
57 | |
58 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
59 | ||
d4b125e9 AE |
60 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
61 | #define RBD_MAX_SNAP_NAME_LEN \ | |
62 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
63 | ||
35d489f9 | 64 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
65 | |
66 | #define RBD_SNAP_HEAD_NAME "-" | |
67 | ||
9e15b77d AE |
68 | /* This allows a single page to hold an image name sent by OSD */ |
69 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 70 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 71 | |
1e130199 | 72 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 73 | |
d889140c AE |
74 | /* Feature bits */ |
75 | ||
5cbf6f12 AE |
76 | #define RBD_FEATURE_LAYERING (1<<0) |
77 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
78 | #define RBD_FEATURES_ALL \ | |
79 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
80 | |
81 | /* Features supported by this (client software) implementation. */ | |
82 | ||
770eba6e | 83 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 84 | |
81a89793 AE |
85 | /* |
86 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
87 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
88 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
89 | * enough to hold all possible device names. | |
90 | */ | |
602adf40 | 91 | #define DEV_NAME_LEN 32 |
81a89793 | 92 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
93 | |
94 | /* | |
95 | * block device image metadata (in-memory version) | |
96 | */ | |
97 | struct rbd_image_header { | |
f84344f3 | 98 | /* These four fields never change for a given rbd image */ |
849b4260 | 99 | char *object_prefix; |
34b13184 | 100 | u64 features; |
602adf40 YS |
101 | __u8 obj_order; |
102 | __u8 crypt_type; | |
103 | __u8 comp_type; | |
602adf40 | 104 | |
f84344f3 AE |
105 | /* The remaining fields need to be updated occasionally */ |
106 | u64 image_size; | |
107 | struct ceph_snap_context *snapc; | |
602adf40 YS |
108 | char *snap_names; |
109 | u64 *snap_sizes; | |
59c2be1e | 110 | |
500d0c0f AE |
111 | u64 stripe_unit; |
112 | u64 stripe_count; | |
59c2be1e YS |
113 | }; |
114 | ||
0d7dbfce AE |
115 | /* |
116 | * An rbd image specification. | |
117 | * | |
118 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
119 | * identify an image. Each rbd_dev structure includes a pointer to |
120 | * an rbd_spec structure that encapsulates this identity. | |
121 | * | |
122 | * Each of the id's in an rbd_spec has an associated name. For a | |
123 | * user-mapped image, the names are supplied and the id's associated | |
124 | * with them are looked up. For a layered image, a parent image is | |
125 | * defined by the tuple, and the names are looked up. | |
126 | * | |
127 | * An rbd_dev structure contains a parent_spec pointer which is | |
128 | * non-null if the image it represents is a child in a layered | |
129 | * image. This pointer will refer to the rbd_spec structure used | |
130 | * by the parent rbd_dev for its own identity (i.e., the structure | |
131 | * is shared between the parent and child). | |
132 | * | |
133 | * Since these structures are populated once, during the discovery | |
134 | * phase of image construction, they are effectively immutable so | |
135 | * we make no effort to synchronize access to them. | |
136 | * | |
137 | * Note that code herein does not assume the image name is known (it | |
138 | * could be a null pointer). | |
0d7dbfce AE |
139 | */ |
140 | struct rbd_spec { | |
141 | u64 pool_id; | |
ecb4dc22 | 142 | const char *pool_name; |
0d7dbfce | 143 | |
ecb4dc22 AE |
144 | const char *image_id; |
145 | const char *image_name; | |
0d7dbfce AE |
146 | |
147 | u64 snap_id; | |
ecb4dc22 | 148 | const char *snap_name; |
0d7dbfce AE |
149 | |
150 | struct kref kref; | |
151 | }; | |
152 | ||
602adf40 | 153 | /* |
f0f8cef5 | 154 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
155 | */ |
156 | struct rbd_client { | |
157 | struct ceph_client *client; | |
158 | struct kref kref; | |
159 | struct list_head node; | |
160 | }; | |
161 | ||
bf0d5f50 AE |
162 | struct rbd_img_request; |
163 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
164 | ||
165 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
166 | ||
167 | struct rbd_obj_request; | |
168 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
169 | ||
9969ebc5 AE |
170 | enum obj_request_type { |
171 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
172 | }; | |
bf0d5f50 | 173 | |
926f9b3f AE |
174 | enum obj_req_flags { |
175 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 176 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
177 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
178 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
179 | }; |
180 | ||
bf0d5f50 AE |
181 | struct rbd_obj_request { |
182 | const char *object_name; | |
183 | u64 offset; /* object start byte */ | |
184 | u64 length; /* bytes from offset */ | |
926f9b3f | 185 | unsigned long flags; |
bf0d5f50 | 186 | |
c5b5ef6c AE |
187 | /* |
188 | * An object request associated with an image will have its | |
189 | * img_data flag set; a standalone object request will not. | |
190 | * | |
191 | * A standalone object request will have which == BAD_WHICH | |
192 | * and a null obj_request pointer. | |
193 | * | |
194 | * An object request initiated in support of a layered image | |
195 | * object (to check for its existence before a write) will | |
196 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
197 | * | |
198 | * Finally, an object request for rbd image data will have | |
199 | * which != BAD_WHICH, and will have a non-null img_request | |
200 | * pointer. The value of which will be in the range | |
201 | * 0..(img_request->obj_request_count-1). | |
202 | */ | |
203 | union { | |
204 | struct rbd_obj_request *obj_request; /* STAT op */ | |
205 | struct { | |
206 | struct rbd_img_request *img_request; | |
207 | u64 img_offset; | |
208 | /* links for img_request->obj_requests list */ | |
209 | struct list_head links; | |
210 | }; | |
211 | }; | |
bf0d5f50 AE |
212 | u32 which; /* posn image request list */ |
213 | ||
214 | enum obj_request_type type; | |
788e2df3 AE |
215 | union { |
216 | struct bio *bio_list; | |
217 | struct { | |
218 | struct page **pages; | |
219 | u32 page_count; | |
220 | }; | |
221 | }; | |
0eefd470 | 222 | struct page **copyup_pages; |
bf0d5f50 AE |
223 | |
224 | struct ceph_osd_request *osd_req; | |
225 | ||
226 | u64 xferred; /* bytes transferred */ | |
227 | u64 version; | |
1b83bef2 | 228 | int result; |
bf0d5f50 AE |
229 | |
230 | rbd_obj_callback_t callback; | |
788e2df3 | 231 | struct completion completion; |
bf0d5f50 AE |
232 | |
233 | struct kref kref; | |
234 | }; | |
235 | ||
0c425248 | 236 | enum img_req_flags { |
9849e986 AE |
237 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
238 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 239 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
240 | }; |
241 | ||
bf0d5f50 | 242 | struct rbd_img_request { |
bf0d5f50 AE |
243 | struct rbd_device *rbd_dev; |
244 | u64 offset; /* starting image byte offset */ | |
245 | u64 length; /* byte count from offset */ | |
0c425248 | 246 | unsigned long flags; |
bf0d5f50 | 247 | union { |
9849e986 | 248 | u64 snap_id; /* for reads */ |
bf0d5f50 | 249 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
250 | }; |
251 | union { | |
252 | struct request *rq; /* block request */ | |
253 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 254 | }; |
3d7efd18 | 255 | struct page **copyup_pages; |
bf0d5f50 AE |
256 | spinlock_t completion_lock;/* protects next_completion */ |
257 | u32 next_completion; | |
258 | rbd_img_callback_t callback; | |
55f27e09 | 259 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 260 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
261 | |
262 | u32 obj_request_count; | |
263 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
264 | ||
265 | struct kref kref; | |
266 | }; | |
267 | ||
268 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 269 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 270 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 271 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 272 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 273 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 274 | |
dfc5606d | 275 | struct rbd_snap { |
dfc5606d | 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 | 357 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
304f6808 | 358 | |
200a6a8b | 359 | static void rbd_dev_device_release(struct device *dev); |
6087b51b | 360 | static void rbd_snap_destroy(struct rbd_snap *snap); |
dfc5606d | 361 | |
f0f8cef5 AE |
362 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
363 | size_t count); | |
364 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
365 | size_t count); | |
71f293e2 | 366 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev); |
f0f8cef5 AE |
367 | |
368 | static struct bus_attribute rbd_bus_attrs[] = { | |
369 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
370 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
371 | __ATTR_NULL | |
372 | }; | |
373 | ||
374 | static struct bus_type rbd_bus_type = { | |
375 | .name = "rbd", | |
376 | .bus_attrs = rbd_bus_attrs, | |
377 | }; | |
378 | ||
379 | static void rbd_root_dev_release(struct device *dev) | |
380 | { | |
381 | } | |
382 | ||
383 | static struct device rbd_root_dev = { | |
384 | .init_name = "rbd", | |
385 | .release = rbd_root_dev_release, | |
386 | }; | |
387 | ||
06ecc6cb AE |
388 | static __printf(2, 3) |
389 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
390 | { | |
391 | struct va_format vaf; | |
392 | va_list args; | |
393 | ||
394 | va_start(args, fmt); | |
395 | vaf.fmt = fmt; | |
396 | vaf.va = &args; | |
397 | ||
398 | if (!rbd_dev) | |
399 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
400 | else if (rbd_dev->disk) | |
401 | printk(KERN_WARNING "%s: %s: %pV\n", | |
402 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
403 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
404 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
405 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
406 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
407 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
408 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
409 | else /* punt */ | |
410 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
411 | RBD_DRV_NAME, rbd_dev, &vaf); | |
412 | va_end(args); | |
413 | } | |
414 | ||
aafb230e AE |
415 | #ifdef RBD_DEBUG |
416 | #define rbd_assert(expr) \ | |
417 | if (unlikely(!(expr))) { \ | |
418 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
419 | "at line %d:\n\n" \ | |
420 | "\trbd_assert(%s);\n\n", \ | |
421 | __func__, __LINE__, #expr); \ | |
422 | BUG(); \ | |
423 | } | |
424 | #else /* !RBD_DEBUG */ | |
425 | # define rbd_assert(expr) ((void) 0) | |
426 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 427 | |
b454e36d | 428 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
429 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
430 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 431 | |
cc4a38bd AE |
432 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
433 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev); | |
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 YS |
778 | } else { |
779 | header->snap_names = NULL; | |
780 | header->snap_sizes = NULL; | |
781 | } | |
849b4260 | 782 | |
34b13184 | 783 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
784 | header->obj_order = ondisk->options.order; |
785 | header->crypt_type = ondisk->options.crypt_type; | |
786 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 787 | |
621901d6 AE |
788 | /* Allocate and fill in the snapshot context */ |
789 | ||
f84344f3 | 790 | header->image_size = le64_to_cpu(ondisk->image_size); |
468521c1 | 791 | |
812164f8 | 792 | header->snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
6a52325f AE |
793 | if (!header->snapc) |
794 | goto out_err; | |
505cbb9b | 795 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
621901d6 | 796 | for (i = 0; i < snap_count; i++) |
468521c1 | 797 | header->snapc->snaps[i] = le64_to_cpu(ondisk->snaps[i].id); |
602adf40 YS |
798 | |
799 | return 0; | |
800 | ||
6a52325f | 801 | out_err: |
849b4260 | 802 | kfree(header->snap_sizes); |
ccece235 | 803 | header->snap_sizes = NULL; |
602adf40 | 804 | kfree(header->snap_names); |
ccece235 | 805 | header->snap_names = NULL; |
6a52325f AE |
806 | kfree(header->object_prefix); |
807 | header->object_prefix = NULL; | |
ccece235 | 808 | |
00f1f36f | 809 | return -ENOMEM; |
602adf40 YS |
810 | } |
811 | ||
9e15b77d AE |
812 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
813 | { | |
814 | struct rbd_snap *snap; | |
815 | ||
816 | if (snap_id == CEPH_NOSNAP) | |
817 | return RBD_SNAP_HEAD_NAME; | |
818 | ||
819 | list_for_each_entry(snap, &rbd_dev->snaps, node) | |
820 | if (snap_id == snap->id) | |
821 | return snap->name; | |
822 | ||
823 | return NULL; | |
824 | } | |
825 | ||
8b0241f8 AE |
826 | static struct rbd_snap *snap_by_name(struct rbd_device *rbd_dev, |
827 | const char *snap_name) | |
602adf40 | 828 | { |
e86924a8 | 829 | struct rbd_snap *snap; |
602adf40 | 830 | |
8b0241f8 AE |
831 | list_for_each_entry(snap, &rbd_dev->snaps, node) |
832 | if (!strcmp(snap_name, snap->name)) | |
833 | return snap; | |
e86924a8 | 834 | |
8b0241f8 | 835 | return NULL; |
602adf40 YS |
836 | } |
837 | ||
d1cf5788 | 838 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
602adf40 | 839 | { |
0d7dbfce | 840 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 841 | sizeof (RBD_SNAP_HEAD_NAME))) { |
99c1f08f | 842 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 843 | rbd_dev->mapping.features = rbd_dev->header.features; |
602adf40 | 844 | } else { |
8b0241f8 AE |
845 | struct rbd_snap *snap; |
846 | ||
847 | snap = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); | |
848 | if (!snap) | |
849 | return -ENOENT; | |
8b0241f8 AE |
850 | rbd_dev->mapping.size = snap->size; |
851 | rbd_dev->mapping.features = snap->features; | |
f84344f3 | 852 | rbd_dev->mapping.read_only = true; |
602adf40 | 853 | } |
6d292906 | 854 | |
8b0241f8 | 855 | return 0; |
602adf40 YS |
856 | } |
857 | ||
d1cf5788 AE |
858 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
859 | { | |
860 | rbd_dev->mapping.size = 0; | |
861 | rbd_dev->mapping.features = 0; | |
862 | rbd_dev->mapping.read_only = true; | |
863 | } | |
864 | ||
200a6a8b AE |
865 | static void rbd_dev_clear_mapping(struct rbd_device *rbd_dev) |
866 | { | |
867 | rbd_dev->mapping.size = 0; | |
868 | rbd_dev->mapping.features = 0; | |
869 | rbd_dev->mapping.read_only = true; | |
870 | } | |
871 | ||
98571b5a | 872 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 873 | { |
65ccfe21 AE |
874 | char *name; |
875 | u64 segment; | |
876 | int ret; | |
602adf40 | 877 | |
2fd82b9e | 878 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
879 | if (!name) |
880 | return NULL; | |
881 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 882 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 883 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 884 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
885 | pr_err("error formatting segment name for #%llu (%d)\n", |
886 | segment, ret); | |
887 | kfree(name); | |
888 | name = NULL; | |
889 | } | |
602adf40 | 890 | |
65ccfe21 AE |
891 | return name; |
892 | } | |
602adf40 | 893 | |
65ccfe21 AE |
894 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
895 | { | |
896 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 897 | |
65ccfe21 AE |
898 | return offset & (segment_size - 1); |
899 | } | |
900 | ||
901 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
902 | u64 offset, u64 length) | |
903 | { | |
904 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
905 | ||
906 | offset &= segment_size - 1; | |
907 | ||
aafb230e | 908 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
909 | if (offset + length > segment_size) |
910 | length = segment_size - offset; | |
911 | ||
912 | return length; | |
602adf40 YS |
913 | } |
914 | ||
029bcbd8 JD |
915 | /* |
916 | * returns the size of an object in the image | |
917 | */ | |
918 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
919 | { | |
920 | return 1 << header->obj_order; | |
921 | } | |
922 | ||
602adf40 YS |
923 | /* |
924 | * bio helpers | |
925 | */ | |
926 | ||
927 | static void bio_chain_put(struct bio *chain) | |
928 | { | |
929 | struct bio *tmp; | |
930 | ||
931 | while (chain) { | |
932 | tmp = chain; | |
933 | chain = chain->bi_next; | |
934 | bio_put(tmp); | |
935 | } | |
936 | } | |
937 | ||
938 | /* | |
939 | * zeros a bio chain, starting at specific offset | |
940 | */ | |
941 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
942 | { | |
943 | struct bio_vec *bv; | |
944 | unsigned long flags; | |
945 | void *buf; | |
946 | int i; | |
947 | int pos = 0; | |
948 | ||
949 | while (chain) { | |
950 | bio_for_each_segment(bv, chain, i) { | |
951 | if (pos + bv->bv_len > start_ofs) { | |
952 | int remainder = max(start_ofs - pos, 0); | |
953 | buf = bvec_kmap_irq(bv, &flags); | |
954 | memset(buf + remainder, 0, | |
955 | bv->bv_len - remainder); | |
85b5aaa6 | 956 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
957 | } |
958 | pos += bv->bv_len; | |
959 | } | |
960 | ||
961 | chain = chain->bi_next; | |
962 | } | |
963 | } | |
964 | ||
b9434c5b AE |
965 | /* |
966 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
967 | * starting at the given byte offset from the start of the array and | |
968 | * continuing up to the given end offset. The pages array is | |
969 | * assumed to be big enough to hold all bytes up to the end. | |
970 | */ | |
971 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
972 | { | |
973 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
974 | ||
975 | rbd_assert(end > offset); | |
976 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
977 | while (offset < end) { | |
978 | size_t page_offset; | |
979 | size_t length; | |
980 | unsigned long flags; | |
981 | void *kaddr; | |
982 | ||
983 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
984 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
985 | local_irq_save(flags); | |
986 | kaddr = kmap_atomic(*page); | |
987 | memset(kaddr + page_offset, 0, length); | |
988 | kunmap_atomic(kaddr); | |
989 | local_irq_restore(flags); | |
990 | ||
991 | offset += length; | |
992 | page++; | |
993 | } | |
994 | } | |
995 | ||
602adf40 | 996 | /* |
f7760dad AE |
997 | * Clone a portion of a bio, starting at the given byte offset |
998 | * and continuing for the number of bytes indicated. | |
602adf40 | 999 | */ |
f7760dad AE |
1000 | static struct bio *bio_clone_range(struct bio *bio_src, |
1001 | unsigned int offset, | |
1002 | unsigned int len, | |
1003 | gfp_t gfpmask) | |
602adf40 | 1004 | { |
f7760dad AE |
1005 | struct bio_vec *bv; |
1006 | unsigned int resid; | |
1007 | unsigned short idx; | |
1008 | unsigned int voff; | |
1009 | unsigned short end_idx; | |
1010 | unsigned short vcnt; | |
1011 | struct bio *bio; | |
1012 | ||
1013 | /* Handle the easy case for the caller */ | |
1014 | ||
1015 | if (!offset && len == bio_src->bi_size) | |
1016 | return bio_clone(bio_src, gfpmask); | |
1017 | ||
1018 | if (WARN_ON_ONCE(!len)) | |
1019 | return NULL; | |
1020 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1021 | return NULL; | |
1022 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1023 | return NULL; | |
1024 | ||
1025 | /* Find first affected segment... */ | |
1026 | ||
1027 | resid = offset; | |
1028 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1029 | if (resid < bv->bv_len) | |
1030 | break; | |
1031 | resid -= bv->bv_len; | |
602adf40 | 1032 | } |
f7760dad | 1033 | voff = resid; |
602adf40 | 1034 | |
f7760dad | 1035 | /* ...and the last affected segment */ |
602adf40 | 1036 | |
f7760dad AE |
1037 | resid += len; |
1038 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1039 | if (resid <= bv->bv_len) | |
1040 | break; | |
1041 | resid -= bv->bv_len; | |
1042 | } | |
1043 | vcnt = end_idx - idx + 1; | |
1044 | ||
1045 | /* Build the clone */ | |
1046 | ||
1047 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1048 | if (!bio) | |
1049 | return NULL; /* ENOMEM */ | |
602adf40 | 1050 | |
f7760dad AE |
1051 | bio->bi_bdev = bio_src->bi_bdev; |
1052 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1053 | bio->bi_rw = bio_src->bi_rw; | |
1054 | bio->bi_flags |= 1 << BIO_CLONED; | |
1055 | ||
1056 | /* | |
1057 | * Copy over our part of the bio_vec, then update the first | |
1058 | * and last (or only) entries. | |
1059 | */ | |
1060 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1061 | vcnt * sizeof (struct bio_vec)); | |
1062 | bio->bi_io_vec[0].bv_offset += voff; | |
1063 | if (vcnt > 1) { | |
1064 | bio->bi_io_vec[0].bv_len -= voff; | |
1065 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1066 | } else { | |
1067 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1068 | } |
1069 | ||
f7760dad AE |
1070 | bio->bi_vcnt = vcnt; |
1071 | bio->bi_size = len; | |
1072 | bio->bi_idx = 0; | |
1073 | ||
1074 | return bio; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Clone a portion of a bio chain, starting at the given byte offset | |
1079 | * into the first bio in the source chain and continuing for the | |
1080 | * number of bytes indicated. The result is another bio chain of | |
1081 | * exactly the given length, or a null pointer on error. | |
1082 | * | |
1083 | * The bio_src and offset parameters are both in-out. On entry they | |
1084 | * refer to the first source bio and the offset into that bio where | |
1085 | * the start of data to be cloned is located. | |
1086 | * | |
1087 | * On return, bio_src is updated to refer to the bio in the source | |
1088 | * chain that contains first un-cloned byte, and *offset will | |
1089 | * contain the offset of that byte within that bio. | |
1090 | */ | |
1091 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1092 | unsigned int *offset, | |
1093 | unsigned int len, | |
1094 | gfp_t gfpmask) | |
1095 | { | |
1096 | struct bio *bi = *bio_src; | |
1097 | unsigned int off = *offset; | |
1098 | struct bio *chain = NULL; | |
1099 | struct bio **end; | |
1100 | ||
1101 | /* Build up a chain of clone bios up to the limit */ | |
1102 | ||
1103 | if (!bi || off >= bi->bi_size || !len) | |
1104 | return NULL; /* Nothing to clone */ | |
602adf40 | 1105 | |
f7760dad AE |
1106 | end = &chain; |
1107 | while (len) { | |
1108 | unsigned int bi_size; | |
1109 | struct bio *bio; | |
1110 | ||
f5400b7a AE |
1111 | if (!bi) { |
1112 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1113 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1114 | } |
f7760dad AE |
1115 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1116 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1117 | if (!bio) | |
1118 | goto out_err; /* ENOMEM */ | |
1119 | ||
1120 | *end = bio; | |
1121 | end = &bio->bi_next; | |
602adf40 | 1122 | |
f7760dad AE |
1123 | off += bi_size; |
1124 | if (off == bi->bi_size) { | |
1125 | bi = bi->bi_next; | |
1126 | off = 0; | |
1127 | } | |
1128 | len -= bi_size; | |
1129 | } | |
1130 | *bio_src = bi; | |
1131 | *offset = off; | |
1132 | ||
1133 | return chain; | |
1134 | out_err: | |
1135 | bio_chain_put(chain); | |
602adf40 | 1136 | |
602adf40 YS |
1137 | return NULL; |
1138 | } | |
1139 | ||
926f9b3f AE |
1140 | /* |
1141 | * The default/initial value for all object request flags is 0. For | |
1142 | * each flag, once its value is set to 1 it is never reset to 0 | |
1143 | * again. | |
1144 | */ | |
57acbaa7 | 1145 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1146 | { |
57acbaa7 | 1147 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1148 | struct rbd_device *rbd_dev; |
1149 | ||
57acbaa7 AE |
1150 | rbd_dev = obj_request->img_request->rbd_dev; |
1151 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1152 | obj_request); |
1153 | } | |
1154 | } | |
1155 | ||
57acbaa7 | 1156 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1157 | { |
1158 | smp_mb(); | |
57acbaa7 | 1159 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1160 | } |
1161 | ||
57acbaa7 | 1162 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1163 | { |
57acbaa7 AE |
1164 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1165 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1166 | |
57acbaa7 AE |
1167 | if (obj_request_img_data_test(obj_request)) |
1168 | rbd_dev = obj_request->img_request->rbd_dev; | |
1169 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1170 | obj_request); |
1171 | } | |
1172 | } | |
1173 | ||
57acbaa7 | 1174 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1175 | { |
1176 | smp_mb(); | |
57acbaa7 | 1177 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1178 | } |
1179 | ||
5679c59f AE |
1180 | /* |
1181 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1182 | * flag. The latter is set based on the "exists" value provided. | |
1183 | * | |
1184 | * Note that for our purposes once an object exists it never goes | |
1185 | * away again. It's possible that the response from two existence | |
1186 | * checks are separated by the creation of the target object, and | |
1187 | * the first ("doesn't exist") response arrives *after* the second | |
1188 | * ("does exist"). In that case we ignore the second one. | |
1189 | */ | |
1190 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1191 | bool exists) | |
1192 | { | |
1193 | if (exists) | |
1194 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1195 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1196 | smp_mb(); | |
1197 | } | |
1198 | ||
1199 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1200 | { | |
1201 | smp_mb(); | |
1202 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1203 | } | |
1204 | ||
1205 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1206 | { | |
1207 | smp_mb(); | |
1208 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1209 | } | |
1210 | ||
bf0d5f50 AE |
1211 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1212 | { | |
37206ee5 AE |
1213 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1214 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1215 | kref_get(&obj_request->kref); |
1216 | } | |
1217 | ||
1218 | static void rbd_obj_request_destroy(struct kref *kref); | |
1219 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1220 | { | |
1221 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1222 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1223 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1224 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1225 | } | |
1226 | ||
1227 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1228 | { | |
37206ee5 AE |
1229 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1230 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1231 | kref_get(&img_request->kref); |
1232 | } | |
1233 | ||
1234 | static void rbd_img_request_destroy(struct kref *kref); | |
1235 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1236 | { | |
1237 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1238 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1239 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1240 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1241 | } | |
1242 | ||
1243 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1244 | struct rbd_obj_request *obj_request) | |
1245 | { | |
25dcf954 AE |
1246 | rbd_assert(obj_request->img_request == NULL); |
1247 | ||
b155e86c | 1248 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1249 | obj_request->img_request = img_request; |
25dcf954 | 1250 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1251 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1252 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1253 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1254 | img_request->obj_request_count++; |
1255 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1256 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1257 | obj_request->which); | |
bf0d5f50 AE |
1258 | } |
1259 | ||
1260 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1261 | struct rbd_obj_request *obj_request) | |
1262 | { | |
1263 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1264 | |
37206ee5 AE |
1265 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1266 | obj_request->which); | |
bf0d5f50 | 1267 | list_del(&obj_request->links); |
25dcf954 AE |
1268 | rbd_assert(img_request->obj_request_count > 0); |
1269 | img_request->obj_request_count--; | |
1270 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1271 | obj_request->which = BAD_WHICH; | |
6365d33a | 1272 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1273 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1274 | obj_request->img_request = NULL; |
25dcf954 | 1275 | obj_request->callback = NULL; |
bf0d5f50 AE |
1276 | rbd_obj_request_put(obj_request); |
1277 | } | |
1278 | ||
1279 | static bool obj_request_type_valid(enum obj_request_type type) | |
1280 | { | |
1281 | switch (type) { | |
9969ebc5 | 1282 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1283 | case OBJ_REQUEST_BIO: |
788e2df3 | 1284 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1285 | return true; |
1286 | default: | |
1287 | return false; | |
1288 | } | |
1289 | } | |
1290 | ||
bf0d5f50 AE |
1291 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1292 | struct rbd_obj_request *obj_request) | |
1293 | { | |
37206ee5 AE |
1294 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1295 | ||
bf0d5f50 AE |
1296 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1297 | } | |
1298 | ||
1299 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1300 | { | |
55f27e09 | 1301 | |
37206ee5 | 1302 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1303 | |
1304 | /* | |
1305 | * If no error occurred, compute the aggregate transfer | |
1306 | * count for the image request. We could instead use | |
1307 | * atomic64_cmpxchg() to update it as each object request | |
1308 | * completes; not clear which way is better off hand. | |
1309 | */ | |
1310 | if (!img_request->result) { | |
1311 | struct rbd_obj_request *obj_request; | |
1312 | u64 xferred = 0; | |
1313 | ||
1314 | for_each_obj_request(img_request, obj_request) | |
1315 | xferred += obj_request->xferred; | |
1316 | img_request->xferred = xferred; | |
1317 | } | |
1318 | ||
bf0d5f50 AE |
1319 | if (img_request->callback) |
1320 | img_request->callback(img_request); | |
1321 | else | |
1322 | rbd_img_request_put(img_request); | |
1323 | } | |
1324 | ||
788e2df3 AE |
1325 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1326 | ||
1327 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1328 | { | |
37206ee5 AE |
1329 | dout("%s: obj %p\n", __func__, obj_request); |
1330 | ||
788e2df3 AE |
1331 | return wait_for_completion_interruptible(&obj_request->completion); |
1332 | } | |
1333 | ||
0c425248 AE |
1334 | /* |
1335 | * The default/initial value for all image request flags is 0. Each | |
1336 | * is conditionally set to 1 at image request initialization time | |
1337 | * and currently never change thereafter. | |
1338 | */ | |
1339 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1340 | { | |
1341 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1342 | smp_mb(); | |
1343 | } | |
1344 | ||
1345 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1346 | { | |
1347 | smp_mb(); | |
1348 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1349 | } | |
1350 | ||
9849e986 AE |
1351 | static void img_request_child_set(struct rbd_img_request *img_request) |
1352 | { | |
1353 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1354 | smp_mb(); | |
1355 | } | |
1356 | ||
1357 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1358 | { | |
1359 | smp_mb(); | |
1360 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1361 | } | |
1362 | ||
d0b2e944 AE |
1363 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1364 | { | |
1365 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1366 | smp_mb(); | |
1367 | } | |
1368 | ||
1369 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1370 | { | |
1371 | smp_mb(); | |
1372 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1373 | } | |
1374 | ||
6e2a4505 AE |
1375 | static void |
1376 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1377 | { | |
b9434c5b AE |
1378 | u64 xferred = obj_request->xferred; |
1379 | u64 length = obj_request->length; | |
1380 | ||
6e2a4505 AE |
1381 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1382 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1383 | xferred, length); |
6e2a4505 AE |
1384 | /* |
1385 | * ENOENT means a hole in the image. We zero-fill the | |
1386 | * entire length of the request. A short read also implies | |
1387 | * zero-fill to the end of the request. Either way we | |
1388 | * update the xferred count to indicate the whole request | |
1389 | * was satisfied. | |
1390 | */ | |
b9434c5b | 1391 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1392 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1393 | if (obj_request->type == OBJ_REQUEST_BIO) |
1394 | zero_bio_chain(obj_request->bio_list, 0); | |
1395 | else | |
1396 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1397 | obj_request->result = 0; |
b9434c5b AE |
1398 | obj_request->xferred = length; |
1399 | } else if (xferred < length && !obj_request->result) { | |
1400 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1401 | zero_bio_chain(obj_request->bio_list, xferred); | |
1402 | else | |
1403 | zero_pages(obj_request->pages, xferred, length); | |
1404 | obj_request->xferred = length; | |
6e2a4505 AE |
1405 | } |
1406 | obj_request_done_set(obj_request); | |
1407 | } | |
1408 | ||
bf0d5f50 AE |
1409 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1410 | { | |
37206ee5 AE |
1411 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1412 | obj_request->callback); | |
bf0d5f50 AE |
1413 | if (obj_request->callback) |
1414 | obj_request->callback(obj_request); | |
788e2df3 AE |
1415 | else |
1416 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1417 | } |
1418 | ||
c47f9371 | 1419 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1420 | { |
1421 | dout("%s: obj %p\n", __func__, obj_request); | |
1422 | obj_request_done_set(obj_request); | |
1423 | } | |
1424 | ||
c47f9371 | 1425 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1426 | { |
57acbaa7 | 1427 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1428 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1429 | bool layered = false; |
1430 | ||
1431 | if (obj_request_img_data_test(obj_request)) { | |
1432 | img_request = obj_request->img_request; | |
1433 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1434 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1435 | } |
8b3e1a56 AE |
1436 | |
1437 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1438 | obj_request, img_request, obj_request->result, | |
1439 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1440 | if (layered && obj_request->result == -ENOENT && |
1441 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1442 | rbd_img_parent_read(obj_request); |
1443 | else if (img_request) | |
6e2a4505 AE |
1444 | rbd_img_obj_request_read_callback(obj_request); |
1445 | else | |
1446 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1447 | } |
1448 | ||
c47f9371 | 1449 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1450 | { |
1b83bef2 SW |
1451 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1452 | obj_request->result, obj_request->length); | |
1453 | /* | |
8b3e1a56 AE |
1454 | * There is no such thing as a successful short write. Set |
1455 | * it to our originally-requested length. | |
1b83bef2 SW |
1456 | */ |
1457 | obj_request->xferred = obj_request->length; | |
07741308 | 1458 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1459 | } |
1460 | ||
fbfab539 AE |
1461 | /* |
1462 | * For a simple stat call there's nothing to do. We'll do more if | |
1463 | * this is part of a write sequence for a layered image. | |
1464 | */ | |
c47f9371 | 1465 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1466 | { |
37206ee5 | 1467 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1468 | obj_request_done_set(obj_request); |
1469 | } | |
1470 | ||
bf0d5f50 AE |
1471 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1472 | struct ceph_msg *msg) | |
1473 | { | |
1474 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1475 | u16 opcode; |
1476 | ||
37206ee5 | 1477 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1478 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1479 | if (obj_request_img_data_test(obj_request)) { |
1480 | rbd_assert(obj_request->img_request); | |
1481 | rbd_assert(obj_request->which != BAD_WHICH); | |
1482 | } else { | |
1483 | rbd_assert(obj_request->which == BAD_WHICH); | |
1484 | } | |
bf0d5f50 | 1485 | |
1b83bef2 SW |
1486 | if (osd_req->r_result < 0) |
1487 | obj_request->result = osd_req->r_result; | |
bf0d5f50 AE |
1488 | obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); |
1489 | ||
0eefd470 | 1490 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1491 | |
c47f9371 AE |
1492 | /* |
1493 | * We support a 64-bit length, but ultimately it has to be | |
1494 | * passed to blk_end_request(), which takes an unsigned int. | |
1495 | */ | |
1b83bef2 | 1496 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1497 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1498 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1499 | switch (opcode) { |
1500 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1501 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1502 | break; |
1503 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1504 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1505 | break; |
fbfab539 | 1506 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1507 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1508 | break; |
36be9a76 | 1509 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1510 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1511 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1512 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1513 | break; |
bf0d5f50 AE |
1514 | default: |
1515 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1516 | obj_request->object_name, (unsigned short) opcode); | |
1517 | break; | |
1518 | } | |
1519 | ||
07741308 | 1520 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1521 | rbd_obj_request_complete(obj_request); |
1522 | } | |
1523 | ||
9d4df01f | 1524 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1525 | { |
1526 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1527 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1528 | u64 snap_id; |
430c28c3 | 1529 | |
8c042b0d | 1530 | rbd_assert(osd_req != NULL); |
430c28c3 | 1531 | |
9d4df01f | 1532 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1533 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1534 | NULL, snap_id, NULL); |
1535 | } | |
1536 | ||
1537 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1538 | { | |
1539 | struct rbd_img_request *img_request = obj_request->img_request; | |
1540 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1541 | struct ceph_snap_context *snapc; | |
1542 | struct timespec mtime = CURRENT_TIME; | |
1543 | ||
1544 | rbd_assert(osd_req != NULL); | |
1545 | ||
1546 | snapc = img_request ? img_request->snapc : NULL; | |
1547 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1548 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1549 | } |
1550 | ||
bf0d5f50 AE |
1551 | static struct ceph_osd_request *rbd_osd_req_create( |
1552 | struct rbd_device *rbd_dev, | |
1553 | bool write_request, | |
430c28c3 | 1554 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1555 | { |
bf0d5f50 AE |
1556 | struct ceph_snap_context *snapc = NULL; |
1557 | struct ceph_osd_client *osdc; | |
1558 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1559 | |
6365d33a AE |
1560 | if (obj_request_img_data_test(obj_request)) { |
1561 | struct rbd_img_request *img_request = obj_request->img_request; | |
1562 | ||
0c425248 AE |
1563 | rbd_assert(write_request == |
1564 | img_request_write_test(img_request)); | |
1565 | if (write_request) | |
bf0d5f50 | 1566 | snapc = img_request->snapc; |
bf0d5f50 AE |
1567 | } |
1568 | ||
1569 | /* Allocate and initialize the request, for the single op */ | |
1570 | ||
1571 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1572 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1573 | if (!osd_req) | |
1574 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1575 | |
430c28c3 | 1576 | if (write_request) |
bf0d5f50 | 1577 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1578 | else |
bf0d5f50 | 1579 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1580 | |
1581 | osd_req->r_callback = rbd_osd_req_callback; | |
1582 | osd_req->r_priv = obj_request; | |
1583 | ||
1584 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1585 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1586 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1587 | ||
1588 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1589 | ||
bf0d5f50 AE |
1590 | return osd_req; |
1591 | } | |
1592 | ||
0eefd470 AE |
1593 | /* |
1594 | * Create a copyup osd request based on the information in the | |
1595 | * object request supplied. A copyup request has two osd ops, | |
1596 | * a copyup method call, and a "normal" write request. | |
1597 | */ | |
1598 | static struct ceph_osd_request * | |
1599 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1600 | { | |
1601 | struct rbd_img_request *img_request; | |
1602 | struct ceph_snap_context *snapc; | |
1603 | struct rbd_device *rbd_dev; | |
1604 | struct ceph_osd_client *osdc; | |
1605 | struct ceph_osd_request *osd_req; | |
1606 | ||
1607 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1608 | img_request = obj_request->img_request; | |
1609 | rbd_assert(img_request); | |
1610 | rbd_assert(img_request_write_test(img_request)); | |
1611 | ||
1612 | /* Allocate and initialize the request, for the two ops */ | |
1613 | ||
1614 | snapc = img_request->snapc; | |
1615 | rbd_dev = img_request->rbd_dev; | |
1616 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1617 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1618 | if (!osd_req) | |
1619 | return NULL; /* ENOMEM */ | |
1620 | ||
1621 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1622 | osd_req->r_callback = rbd_osd_req_callback; | |
1623 | osd_req->r_priv = obj_request; | |
1624 | ||
1625 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1626 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1627 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1628 | ||
1629 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1630 | ||
1631 | return osd_req; | |
1632 | } | |
1633 | ||
1634 | ||
bf0d5f50 AE |
1635 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1636 | { | |
1637 | ceph_osdc_put_request(osd_req); | |
1638 | } | |
1639 | ||
1640 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1641 | ||
1642 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1643 | u64 offset, u64 length, | |
1644 | enum obj_request_type type) | |
1645 | { | |
1646 | struct rbd_obj_request *obj_request; | |
1647 | size_t size; | |
1648 | char *name; | |
1649 | ||
1650 | rbd_assert(obj_request_type_valid(type)); | |
1651 | ||
1652 | size = strlen(object_name) + 1; | |
1653 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1654 | if (!obj_request) | |
1655 | return NULL; | |
1656 | ||
1657 | name = (char *)(obj_request + 1); | |
1658 | obj_request->object_name = memcpy(name, object_name, size); | |
1659 | obj_request->offset = offset; | |
1660 | obj_request->length = length; | |
926f9b3f | 1661 | obj_request->flags = 0; |
bf0d5f50 AE |
1662 | obj_request->which = BAD_WHICH; |
1663 | obj_request->type = type; | |
1664 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1665 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1666 | kref_init(&obj_request->kref); |
1667 | ||
37206ee5 AE |
1668 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1669 | offset, length, (int)type, obj_request); | |
1670 | ||
bf0d5f50 AE |
1671 | return obj_request; |
1672 | } | |
1673 | ||
1674 | static void rbd_obj_request_destroy(struct kref *kref) | |
1675 | { | |
1676 | struct rbd_obj_request *obj_request; | |
1677 | ||
1678 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1679 | ||
37206ee5 AE |
1680 | dout("%s: obj %p\n", __func__, obj_request); |
1681 | ||
bf0d5f50 AE |
1682 | rbd_assert(obj_request->img_request == NULL); |
1683 | rbd_assert(obj_request->which == BAD_WHICH); | |
1684 | ||
1685 | if (obj_request->osd_req) | |
1686 | rbd_osd_req_destroy(obj_request->osd_req); | |
1687 | ||
1688 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1689 | switch (obj_request->type) { | |
9969ebc5 AE |
1690 | case OBJ_REQUEST_NODATA: |
1691 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1692 | case OBJ_REQUEST_BIO: |
1693 | if (obj_request->bio_list) | |
1694 | bio_chain_put(obj_request->bio_list); | |
1695 | break; | |
788e2df3 AE |
1696 | case OBJ_REQUEST_PAGES: |
1697 | if (obj_request->pages) | |
1698 | ceph_release_page_vector(obj_request->pages, | |
1699 | obj_request->page_count); | |
1700 | break; | |
bf0d5f50 AE |
1701 | } |
1702 | ||
1703 | kfree(obj_request); | |
1704 | } | |
1705 | ||
1706 | /* | |
1707 | * Caller is responsible for filling in the list of object requests | |
1708 | * that comprises the image request, and the Linux request pointer | |
1709 | * (if there is one). | |
1710 | */ | |
cc344fa1 AE |
1711 | static struct rbd_img_request *rbd_img_request_create( |
1712 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1713 | u64 offset, u64 length, |
9849e986 AE |
1714 | bool write_request, |
1715 | bool child_request) | |
bf0d5f50 AE |
1716 | { |
1717 | struct rbd_img_request *img_request; | |
bf0d5f50 AE |
1718 | |
1719 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1720 | if (!img_request) | |
1721 | return NULL; | |
1722 | ||
1723 | if (write_request) { | |
1724 | down_read(&rbd_dev->header_rwsem); | |
812164f8 | 1725 | ceph_get_snap_context(rbd_dev->header.snapc); |
bf0d5f50 | 1726 | up_read(&rbd_dev->header_rwsem); |
bf0d5f50 AE |
1727 | } |
1728 | ||
1729 | img_request->rq = NULL; | |
1730 | img_request->rbd_dev = rbd_dev; | |
1731 | img_request->offset = offset; | |
1732 | img_request->length = length; | |
0c425248 AE |
1733 | img_request->flags = 0; |
1734 | if (write_request) { | |
1735 | img_request_write_set(img_request); | |
468521c1 | 1736 | img_request->snapc = rbd_dev->header.snapc; |
0c425248 | 1737 | } else { |
bf0d5f50 | 1738 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1739 | } |
9849e986 AE |
1740 | if (child_request) |
1741 | img_request_child_set(img_request); | |
d0b2e944 AE |
1742 | if (rbd_dev->parent_spec) |
1743 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1744 | spin_lock_init(&img_request->completion_lock); |
1745 | img_request->next_completion = 0; | |
1746 | img_request->callback = NULL; | |
a5a337d4 | 1747 | img_request->result = 0; |
bf0d5f50 AE |
1748 | img_request->obj_request_count = 0; |
1749 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1750 | kref_init(&img_request->kref); | |
1751 | ||
1752 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1753 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1754 | ||
37206ee5 AE |
1755 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1756 | write_request ? "write" : "read", offset, length, | |
1757 | img_request); | |
1758 | ||
bf0d5f50 AE |
1759 | return img_request; |
1760 | } | |
1761 | ||
1762 | static void rbd_img_request_destroy(struct kref *kref) | |
1763 | { | |
1764 | struct rbd_img_request *img_request; | |
1765 | struct rbd_obj_request *obj_request; | |
1766 | struct rbd_obj_request *next_obj_request; | |
1767 | ||
1768 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1769 | ||
37206ee5 AE |
1770 | dout("%s: img %p\n", __func__, img_request); |
1771 | ||
bf0d5f50 AE |
1772 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1773 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1774 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1775 | |
0c425248 | 1776 | if (img_request_write_test(img_request)) |
812164f8 | 1777 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1778 | |
8b3e1a56 AE |
1779 | if (img_request_child_test(img_request)) |
1780 | rbd_obj_request_put(img_request->obj_request); | |
1781 | ||
bf0d5f50 AE |
1782 | kfree(img_request); |
1783 | } | |
1784 | ||
1217857f AE |
1785 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1786 | { | |
6365d33a | 1787 | struct rbd_img_request *img_request; |
1217857f AE |
1788 | unsigned int xferred; |
1789 | int result; | |
8b3e1a56 | 1790 | bool more; |
1217857f | 1791 | |
6365d33a AE |
1792 | rbd_assert(obj_request_img_data_test(obj_request)); |
1793 | img_request = obj_request->img_request; | |
1794 | ||
1217857f AE |
1795 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1796 | xferred = (unsigned int)obj_request->xferred; | |
1797 | result = obj_request->result; | |
1798 | if (result) { | |
1799 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1800 | ||
1801 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1802 | img_request_write_test(img_request) ? "write" : "read", | |
1803 | obj_request->length, obj_request->img_offset, | |
1804 | obj_request->offset); | |
1805 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1806 | result, xferred); | |
1807 | if (!img_request->result) | |
1808 | img_request->result = result; | |
1809 | } | |
1810 | ||
f1a4739f AE |
1811 | /* Image object requests don't own their page array */ |
1812 | ||
1813 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1814 | obj_request->pages = NULL; | |
1815 | obj_request->page_count = 0; | |
1816 | } | |
1817 | ||
8b3e1a56 AE |
1818 | if (img_request_child_test(img_request)) { |
1819 | rbd_assert(img_request->obj_request != NULL); | |
1820 | more = obj_request->which < img_request->obj_request_count - 1; | |
1821 | } else { | |
1822 | rbd_assert(img_request->rq != NULL); | |
1823 | more = blk_end_request(img_request->rq, result, xferred); | |
1824 | } | |
1825 | ||
1826 | return more; | |
1217857f AE |
1827 | } |
1828 | ||
2169238d AE |
1829 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1830 | { | |
1831 | struct rbd_img_request *img_request; | |
1832 | u32 which = obj_request->which; | |
1833 | bool more = true; | |
1834 | ||
6365d33a | 1835 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1836 | img_request = obj_request->img_request; |
1837 | ||
1838 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1839 | rbd_assert(img_request != NULL); | |
2169238d AE |
1840 | rbd_assert(img_request->obj_request_count > 0); |
1841 | rbd_assert(which != BAD_WHICH); | |
1842 | rbd_assert(which < img_request->obj_request_count); | |
1843 | rbd_assert(which >= img_request->next_completion); | |
1844 | ||
1845 | spin_lock_irq(&img_request->completion_lock); | |
1846 | if (which != img_request->next_completion) | |
1847 | goto out; | |
1848 | ||
1849 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1850 | rbd_assert(more); |
1851 | rbd_assert(which < img_request->obj_request_count); | |
1852 | ||
1853 | if (!obj_request_done_test(obj_request)) | |
1854 | break; | |
1217857f | 1855 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1856 | which++; |
1857 | } | |
1858 | ||
1859 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1860 | img_request->next_completion = which; | |
1861 | out: | |
1862 | spin_unlock_irq(&img_request->completion_lock); | |
1863 | ||
1864 | if (!more) | |
1865 | rbd_img_request_complete(img_request); | |
1866 | } | |
1867 | ||
f1a4739f AE |
1868 | /* |
1869 | * Split up an image request into one or more object requests, each | |
1870 | * to a different object. The "type" parameter indicates whether | |
1871 | * "data_desc" is the pointer to the head of a list of bio | |
1872 | * structures, or the base of a page array. In either case this | |
1873 | * function assumes data_desc describes memory sufficient to hold | |
1874 | * all data described by the image request. | |
1875 | */ | |
1876 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1877 | enum obj_request_type type, | |
1878 | void *data_desc) | |
bf0d5f50 AE |
1879 | { |
1880 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1881 | struct rbd_obj_request *obj_request = NULL; | |
1882 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1883 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1884 | struct bio *bio_list; |
1885 | unsigned int bio_offset = 0; | |
1886 | struct page **pages; | |
7da22d29 | 1887 | u64 img_offset; |
bf0d5f50 AE |
1888 | u64 resid; |
1889 | u16 opcode; | |
1890 | ||
f1a4739f AE |
1891 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1892 | (int)type, data_desc); | |
37206ee5 | 1893 | |
430c28c3 | 1894 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1895 | img_offset = img_request->offset; |
bf0d5f50 | 1896 | resid = img_request->length; |
4dda41d3 | 1897 | rbd_assert(resid > 0); |
f1a4739f AE |
1898 | |
1899 | if (type == OBJ_REQUEST_BIO) { | |
1900 | bio_list = data_desc; | |
1901 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1902 | } else { | |
1903 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
1904 | pages = data_desc; | |
1905 | } | |
1906 | ||
bf0d5f50 | 1907 | while (resid) { |
2fa12320 | 1908 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 1909 | const char *object_name; |
bf0d5f50 AE |
1910 | u64 offset; |
1911 | u64 length; | |
1912 | ||
7da22d29 | 1913 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
1914 | if (!object_name) |
1915 | goto out_unwind; | |
7da22d29 AE |
1916 | offset = rbd_segment_offset(rbd_dev, img_offset); |
1917 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 1918 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 1919 | offset, length, type); |
bf0d5f50 AE |
1920 | kfree(object_name); /* object request has its own copy */ |
1921 | if (!obj_request) | |
1922 | goto out_unwind; | |
1923 | ||
f1a4739f AE |
1924 | if (type == OBJ_REQUEST_BIO) { |
1925 | unsigned int clone_size; | |
1926 | ||
1927 | rbd_assert(length <= (u64)UINT_MAX); | |
1928 | clone_size = (unsigned int)length; | |
1929 | obj_request->bio_list = | |
1930 | bio_chain_clone_range(&bio_list, | |
1931 | &bio_offset, | |
1932 | clone_size, | |
1933 | GFP_ATOMIC); | |
1934 | if (!obj_request->bio_list) | |
1935 | goto out_partial; | |
1936 | } else { | |
1937 | unsigned int page_count; | |
1938 | ||
1939 | obj_request->pages = pages; | |
1940 | page_count = (u32)calc_pages_for(offset, length); | |
1941 | obj_request->page_count = page_count; | |
1942 | if ((offset + length) & ~PAGE_MASK) | |
1943 | page_count--; /* more on last page */ | |
1944 | pages += page_count; | |
1945 | } | |
bf0d5f50 | 1946 | |
2fa12320 AE |
1947 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
1948 | obj_request); | |
1949 | if (!osd_req) | |
bf0d5f50 | 1950 | goto out_partial; |
2fa12320 | 1951 | obj_request->osd_req = osd_req; |
2169238d | 1952 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 1953 | |
2fa12320 AE |
1954 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
1955 | 0, 0); | |
f1a4739f AE |
1956 | if (type == OBJ_REQUEST_BIO) |
1957 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
1958 | obj_request->bio_list, length); | |
1959 | else | |
1960 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
1961 | obj_request->pages, length, | |
1962 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
1963 | |
1964 | if (write_request) | |
1965 | rbd_osd_req_format_write(obj_request); | |
1966 | else | |
1967 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 1968 | |
7da22d29 | 1969 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
1970 | rbd_img_obj_request_add(img_request, obj_request); |
1971 | ||
7da22d29 | 1972 | img_offset += length; |
bf0d5f50 AE |
1973 | resid -= length; |
1974 | } | |
1975 | ||
1976 | return 0; | |
1977 | ||
1978 | out_partial: | |
1979 | rbd_obj_request_put(obj_request); | |
1980 | out_unwind: | |
1981 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
1982 | rbd_obj_request_put(obj_request); | |
1983 | ||
1984 | return -ENOMEM; | |
1985 | } | |
1986 | ||
0eefd470 AE |
1987 | static void |
1988 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
1989 | { | |
1990 | struct rbd_img_request *img_request; | |
1991 | struct rbd_device *rbd_dev; | |
1992 | u64 length; | |
1993 | u32 page_count; | |
1994 | ||
1995 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
1996 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1997 | img_request = obj_request->img_request; | |
1998 | rbd_assert(img_request); | |
1999 | ||
2000 | rbd_dev = img_request->rbd_dev; | |
2001 | rbd_assert(rbd_dev); | |
2002 | length = (u64)1 << rbd_dev->header.obj_order; | |
2003 | page_count = (u32)calc_pages_for(0, length); | |
2004 | ||
2005 | rbd_assert(obj_request->copyup_pages); | |
2006 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2007 | obj_request->copyup_pages = NULL; | |
2008 | ||
2009 | /* | |
2010 | * We want the transfer count to reflect the size of the | |
2011 | * original write request. There is no such thing as a | |
2012 | * successful short write, so if the request was successful | |
2013 | * we can just set it to the originally-requested length. | |
2014 | */ | |
2015 | if (!obj_request->result) | |
2016 | obj_request->xferred = obj_request->length; | |
2017 | ||
2018 | /* Finish up with the normal image object callback */ | |
2019 | ||
2020 | rbd_img_obj_callback(obj_request); | |
2021 | } | |
2022 | ||
3d7efd18 AE |
2023 | static void |
2024 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2025 | { | |
2026 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2027 | struct ceph_osd_request *osd_req; |
2028 | struct ceph_osd_client *osdc; | |
2029 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2030 | struct page **pages; |
3d7efd18 AE |
2031 | int result; |
2032 | u64 obj_size; | |
2033 | u64 xferred; | |
2034 | ||
2035 | rbd_assert(img_request_child_test(img_request)); | |
2036 | ||
2037 | /* First get what we need from the image request */ | |
2038 | ||
2039 | pages = img_request->copyup_pages; | |
2040 | rbd_assert(pages != NULL); | |
2041 | img_request->copyup_pages = NULL; | |
2042 | ||
2043 | orig_request = img_request->obj_request; | |
2044 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2045 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2046 | result = img_request->result; |
2047 | obj_size = img_request->length; | |
2048 | xferred = img_request->xferred; | |
2049 | ||
0eefd470 AE |
2050 | rbd_dev = img_request->rbd_dev; |
2051 | rbd_assert(rbd_dev); | |
2052 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2053 | ||
3d7efd18 AE |
2054 | rbd_img_request_put(img_request); |
2055 | ||
0eefd470 AE |
2056 | if (result) |
2057 | goto out_err; | |
2058 | ||
2059 | /* Allocate the new copyup osd request for the original request */ | |
2060 | ||
2061 | result = -ENOMEM; | |
2062 | rbd_assert(!orig_request->osd_req); | |
2063 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2064 | if (!osd_req) | |
2065 | goto out_err; | |
2066 | orig_request->osd_req = osd_req; | |
2067 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2068 | |
0eefd470 | 2069 | /* Initialize the copyup op */ |
3d7efd18 | 2070 | |
0eefd470 AE |
2071 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2072 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2073 | false, false); | |
3d7efd18 | 2074 | |
0eefd470 AE |
2075 | /* Then the original write request op */ |
2076 | ||
2077 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2078 | orig_request->offset, | |
2079 | orig_request->length, 0, 0); | |
2080 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2081 | orig_request->length); | |
2082 | ||
2083 | rbd_osd_req_format_write(orig_request); | |
2084 | ||
2085 | /* All set, send it off. */ | |
2086 | ||
2087 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2088 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2089 | result = rbd_obj_request_submit(osdc, orig_request); | |
2090 | if (!result) | |
2091 | return; | |
2092 | out_err: | |
2093 | /* Record the error code and complete the request */ | |
2094 | ||
2095 | orig_request->result = result; | |
2096 | orig_request->xferred = 0; | |
2097 | obj_request_done_set(orig_request); | |
2098 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2099 | } |
2100 | ||
2101 | /* | |
2102 | * Read from the parent image the range of data that covers the | |
2103 | * entire target of the given object request. This is used for | |
2104 | * satisfying a layered image write request when the target of an | |
2105 | * object request from the image request does not exist. | |
2106 | * | |
2107 | * A page array big enough to hold the returned data is allocated | |
2108 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2109 | * When the read completes, this page array will be transferred to | |
2110 | * the original object request for the copyup operation. | |
2111 | * | |
2112 | * If an error occurs, record it as the result of the original | |
2113 | * object request and mark it done so it gets completed. | |
2114 | */ | |
2115 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2116 | { | |
2117 | struct rbd_img_request *img_request = NULL; | |
2118 | struct rbd_img_request *parent_request = NULL; | |
2119 | struct rbd_device *rbd_dev; | |
2120 | u64 img_offset; | |
2121 | u64 length; | |
2122 | struct page **pages = NULL; | |
2123 | u32 page_count; | |
2124 | int result; | |
2125 | ||
2126 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2127 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2128 | ||
2129 | img_request = obj_request->img_request; | |
2130 | rbd_assert(img_request != NULL); | |
2131 | rbd_dev = img_request->rbd_dev; | |
2132 | rbd_assert(rbd_dev->parent != NULL); | |
2133 | ||
0eefd470 AE |
2134 | /* |
2135 | * First things first. The original osd request is of no | |
2136 | * use to use any more, we'll need a new one that can hold | |
2137 | * the two ops in a copyup request. We'll get that later, | |
2138 | * but for now we can release the old one. | |
2139 | */ | |
2140 | rbd_osd_req_destroy(obj_request->osd_req); | |
2141 | obj_request->osd_req = NULL; | |
2142 | ||
3d7efd18 AE |
2143 | /* |
2144 | * Determine the byte range covered by the object in the | |
2145 | * child image to which the original request was to be sent. | |
2146 | */ | |
2147 | img_offset = obj_request->img_offset - obj_request->offset; | |
2148 | length = (u64)1 << rbd_dev->header.obj_order; | |
2149 | ||
a9e8ba2c AE |
2150 | /* |
2151 | * There is no defined parent data beyond the parent | |
2152 | * overlap, so limit what we read at that boundary if | |
2153 | * necessary. | |
2154 | */ | |
2155 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2156 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2157 | length = rbd_dev->parent_overlap - img_offset; | |
2158 | } | |
2159 | ||
3d7efd18 AE |
2160 | /* |
2161 | * Allocate a page array big enough to receive the data read | |
2162 | * from the parent. | |
2163 | */ | |
2164 | page_count = (u32)calc_pages_for(0, length); | |
2165 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2166 | if (IS_ERR(pages)) { | |
2167 | result = PTR_ERR(pages); | |
2168 | pages = NULL; | |
2169 | goto out_err; | |
2170 | } | |
2171 | ||
2172 | result = -ENOMEM; | |
2173 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2174 | img_offset, length, | |
2175 | false, true); | |
2176 | if (!parent_request) | |
2177 | goto out_err; | |
2178 | rbd_obj_request_get(obj_request); | |
2179 | parent_request->obj_request = obj_request; | |
2180 | ||
2181 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2182 | if (result) | |
2183 | goto out_err; | |
2184 | parent_request->copyup_pages = pages; | |
2185 | ||
2186 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2187 | result = rbd_img_request_submit(parent_request); | |
2188 | if (!result) | |
2189 | return 0; | |
2190 | ||
2191 | parent_request->copyup_pages = NULL; | |
2192 | parent_request->obj_request = NULL; | |
2193 | rbd_obj_request_put(obj_request); | |
2194 | out_err: | |
2195 | if (pages) | |
2196 | ceph_release_page_vector(pages, page_count); | |
2197 | if (parent_request) | |
2198 | rbd_img_request_put(parent_request); | |
2199 | obj_request->result = result; | |
2200 | obj_request->xferred = 0; | |
2201 | obj_request_done_set(obj_request); | |
2202 | ||
2203 | return result; | |
2204 | } | |
2205 | ||
c5b5ef6c AE |
2206 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2207 | { | |
c5b5ef6c AE |
2208 | struct rbd_obj_request *orig_request; |
2209 | int result; | |
2210 | ||
2211 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2212 | ||
2213 | /* | |
2214 | * All we need from the object request is the original | |
2215 | * request and the result of the STAT op. Grab those, then | |
2216 | * we're done with the request. | |
2217 | */ | |
2218 | orig_request = obj_request->obj_request; | |
2219 | obj_request->obj_request = NULL; | |
2220 | rbd_assert(orig_request); | |
2221 | rbd_assert(orig_request->img_request); | |
2222 | ||
2223 | result = obj_request->result; | |
2224 | obj_request->result = 0; | |
2225 | ||
2226 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2227 | obj_request, orig_request, result, | |
2228 | obj_request->xferred, obj_request->length); | |
2229 | rbd_obj_request_put(obj_request); | |
2230 | ||
2231 | rbd_assert(orig_request); | |
2232 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2233 | |
2234 | /* | |
2235 | * Our only purpose here is to determine whether the object | |
2236 | * exists, and we don't want to treat the non-existence as | |
2237 | * an error. If something else comes back, transfer the | |
2238 | * error to the original request and complete it now. | |
2239 | */ | |
2240 | if (!result) { | |
2241 | obj_request_existence_set(orig_request, true); | |
2242 | } else if (result == -ENOENT) { | |
2243 | obj_request_existence_set(orig_request, false); | |
2244 | } else if (result) { | |
2245 | orig_request->result = result; | |
3d7efd18 | 2246 | goto out; |
c5b5ef6c AE |
2247 | } |
2248 | ||
2249 | /* | |
2250 | * Resubmit the original request now that we have recorded | |
2251 | * whether the target object exists. | |
2252 | */ | |
b454e36d | 2253 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2254 | out: |
c5b5ef6c AE |
2255 | if (orig_request->result) |
2256 | rbd_obj_request_complete(orig_request); | |
2257 | rbd_obj_request_put(orig_request); | |
2258 | } | |
2259 | ||
2260 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2261 | { | |
2262 | struct rbd_obj_request *stat_request; | |
2263 | struct rbd_device *rbd_dev; | |
2264 | struct ceph_osd_client *osdc; | |
2265 | struct page **pages = NULL; | |
2266 | u32 page_count; | |
2267 | size_t size; | |
2268 | int ret; | |
2269 | ||
2270 | /* | |
2271 | * The response data for a STAT call consists of: | |
2272 | * le64 length; | |
2273 | * struct { | |
2274 | * le32 tv_sec; | |
2275 | * le32 tv_nsec; | |
2276 | * } mtime; | |
2277 | */ | |
2278 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2279 | page_count = (u32)calc_pages_for(0, size); | |
2280 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2281 | if (IS_ERR(pages)) | |
2282 | return PTR_ERR(pages); | |
2283 | ||
2284 | ret = -ENOMEM; | |
2285 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2286 | OBJ_REQUEST_PAGES); | |
2287 | if (!stat_request) | |
2288 | goto out; | |
2289 | ||
2290 | rbd_obj_request_get(obj_request); | |
2291 | stat_request->obj_request = obj_request; | |
2292 | stat_request->pages = pages; | |
2293 | stat_request->page_count = page_count; | |
2294 | ||
2295 | rbd_assert(obj_request->img_request); | |
2296 | rbd_dev = obj_request->img_request->rbd_dev; | |
2297 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2298 | stat_request); | |
2299 | if (!stat_request->osd_req) | |
2300 | goto out; | |
2301 | stat_request->callback = rbd_img_obj_exists_callback; | |
2302 | ||
2303 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2304 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2305 | false, false); | |
9d4df01f | 2306 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2307 | |
2308 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2309 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2310 | out: | |
2311 | if (ret) | |
2312 | rbd_obj_request_put(obj_request); | |
2313 | ||
2314 | return ret; | |
2315 | } | |
2316 | ||
b454e36d AE |
2317 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2318 | { | |
2319 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2320 | struct rbd_device *rbd_dev; |
3d7efd18 | 2321 | bool known; |
b454e36d AE |
2322 | |
2323 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2324 | ||
2325 | img_request = obj_request->img_request; | |
2326 | rbd_assert(img_request); | |
a9e8ba2c | 2327 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2328 | |
b454e36d | 2329 | /* |
a9e8ba2c AE |
2330 | * Only writes to layered images need special handling. |
2331 | * Reads and non-layered writes are simple object requests. | |
2332 | * Layered writes that start beyond the end of the overlap | |
2333 | * with the parent have no parent data, so they too are | |
2334 | * simple object requests. Finally, if the target object is | |
2335 | * known to already exist, its parent data has already been | |
2336 | * copied, so a write to the object can also be handled as a | |
2337 | * simple object request. | |
b454e36d AE |
2338 | */ |
2339 | if (!img_request_write_test(img_request) || | |
2340 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2341 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2342 | ((known = obj_request_known_test(obj_request)) && |
2343 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2344 | |
2345 | struct rbd_device *rbd_dev; | |
2346 | struct ceph_osd_client *osdc; | |
2347 | ||
2348 | rbd_dev = obj_request->img_request->rbd_dev; | |
2349 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2350 | ||
2351 | return rbd_obj_request_submit(osdc, obj_request); | |
2352 | } | |
2353 | ||
2354 | /* | |
3d7efd18 AE |
2355 | * It's a layered write. The target object might exist but |
2356 | * we may not know that yet. If we know it doesn't exist, | |
2357 | * start by reading the data for the full target object from | |
2358 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2359 | */ |
3d7efd18 AE |
2360 | if (known) |
2361 | return rbd_img_obj_parent_read_full(obj_request); | |
2362 | ||
2363 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2364 | |
2365 | return rbd_img_obj_exists_submit(obj_request); | |
2366 | } | |
2367 | ||
bf0d5f50 AE |
2368 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2369 | { | |
bf0d5f50 | 2370 | struct rbd_obj_request *obj_request; |
46faeed4 | 2371 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2372 | |
37206ee5 | 2373 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2374 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2375 | int ret; |
2376 | ||
b454e36d | 2377 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2378 | if (ret) |
2379 | return ret; | |
bf0d5f50 AE |
2380 | } |
2381 | ||
2382 | return 0; | |
2383 | } | |
8b3e1a56 AE |
2384 | |
2385 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2386 | { | |
2387 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2388 | struct rbd_device *rbd_dev; |
2389 | u64 obj_end; | |
8b3e1a56 AE |
2390 | |
2391 | rbd_assert(img_request_child_test(img_request)); | |
2392 | ||
2393 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2394 | rbd_assert(obj_request); |
2395 | rbd_assert(obj_request->img_request); | |
2396 | ||
8b3e1a56 | 2397 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2398 | if (obj_request->result) |
2399 | goto out; | |
2400 | ||
2401 | /* | |
2402 | * We need to zero anything beyond the parent overlap | |
2403 | * boundary. Since rbd_img_obj_request_read_callback() | |
2404 | * will zero anything beyond the end of a short read, an | |
2405 | * easy way to do this is to pretend the data from the | |
2406 | * parent came up short--ending at the overlap boundary. | |
2407 | */ | |
2408 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2409 | obj_end = obj_request->img_offset + obj_request->length; | |
2410 | rbd_dev = obj_request->img_request->rbd_dev; | |
2411 | if (obj_end > rbd_dev->parent_overlap) { | |
2412 | u64 xferred = 0; | |
2413 | ||
2414 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2415 | xferred = rbd_dev->parent_overlap - | |
2416 | obj_request->img_offset; | |
8b3e1a56 | 2417 | |
a9e8ba2c AE |
2418 | obj_request->xferred = min(img_request->xferred, xferred); |
2419 | } else { | |
2420 | obj_request->xferred = img_request->xferred; | |
2421 | } | |
2422 | out: | |
8b3e1a56 AE |
2423 | rbd_img_obj_request_read_callback(obj_request); |
2424 | rbd_obj_request_complete(obj_request); | |
2425 | } | |
2426 | ||
2427 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2428 | { | |
2429 | struct rbd_device *rbd_dev; | |
2430 | struct rbd_img_request *img_request; | |
2431 | int result; | |
2432 | ||
2433 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2434 | rbd_assert(obj_request->img_request != NULL); | |
2435 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2436 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2437 | ||
2438 | rbd_dev = obj_request->img_request->rbd_dev; | |
2439 | rbd_assert(rbd_dev->parent != NULL); | |
2440 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2441 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2442 | obj_request->img_offset, | |
2443 | obj_request->length, | |
2444 | false, true); | |
2445 | result = -ENOMEM; | |
2446 | if (!img_request) | |
2447 | goto out_err; | |
2448 | ||
2449 | rbd_obj_request_get(obj_request); | |
2450 | img_request->obj_request = obj_request; | |
2451 | ||
f1a4739f AE |
2452 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2453 | obj_request->bio_list); | |
8b3e1a56 AE |
2454 | if (result) |
2455 | goto out_err; | |
2456 | ||
2457 | img_request->callback = rbd_img_parent_read_callback; | |
2458 | result = rbd_img_request_submit(img_request); | |
2459 | if (result) | |
2460 | goto out_err; | |
2461 | ||
2462 | return; | |
2463 | out_err: | |
2464 | if (img_request) | |
2465 | rbd_img_request_put(img_request); | |
2466 | obj_request->result = result; | |
2467 | obj_request->xferred = 0; | |
2468 | obj_request_done_set(obj_request); | |
2469 | } | |
bf0d5f50 | 2470 | |
cc4a38bd | 2471 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2472 | { |
2473 | struct rbd_obj_request *obj_request; | |
2169238d | 2474 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2475 | int ret; |
2476 | ||
2477 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2478 | OBJ_REQUEST_NODATA); | |
2479 | if (!obj_request) | |
2480 | return -ENOMEM; | |
2481 | ||
2482 | ret = -ENOMEM; | |
430c28c3 | 2483 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2484 | if (!obj_request->osd_req) |
2485 | goto out; | |
2169238d | 2486 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2487 | |
c99d2d4a | 2488 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2489 | notify_id, 0, 0); |
9d4df01f | 2490 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2491 | |
b8d70035 | 2492 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2493 | out: |
cf81b60e AE |
2494 | if (ret) |
2495 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2496 | |
2497 | return ret; | |
2498 | } | |
2499 | ||
2500 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2501 | { | |
2502 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
b8d70035 AE |
2503 | |
2504 | if (!rbd_dev) | |
2505 | return; | |
2506 | ||
37206ee5 | 2507 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2508 | rbd_dev->header_name, (unsigned long long)notify_id, |
2509 | (unsigned int)opcode); | |
2510 | (void)rbd_dev_refresh(rbd_dev); | |
b8d70035 | 2511 | |
cc4a38bd | 2512 | rbd_obj_notify_ack(rbd_dev, notify_id); |
b8d70035 AE |
2513 | } |
2514 | ||
9969ebc5 AE |
2515 | /* |
2516 | * Request sync osd watch/unwatch. The value of "start" determines | |
2517 | * whether a watch request is being initiated or torn down. | |
2518 | */ | |
2519 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2520 | { | |
2521 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2522 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2523 | int ret; |
2524 | ||
2525 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2526 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2527 | ||
2528 | if (start) { | |
3c663bbd | 2529 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2530 | &rbd_dev->watch_event); |
2531 | if (ret < 0) | |
2532 | return ret; | |
8eb87565 | 2533 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2534 | } |
2535 | ||
2536 | ret = -ENOMEM; | |
2537 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2538 | OBJ_REQUEST_NODATA); | |
2539 | if (!obj_request) | |
2540 | goto out_cancel; | |
2541 | ||
430c28c3 AE |
2542 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2543 | if (!obj_request->osd_req) | |
2544 | goto out_cancel; | |
2545 | ||
8eb87565 | 2546 | if (start) |
975241af | 2547 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2548 | else |
6977c3f9 | 2549 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2550 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2551 | |
2552 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
b21ebddd | 2553 | rbd_dev->watch_event->cookie, 0, start); |
9d4df01f | 2554 | rbd_osd_req_format_write(obj_request); |
2169238d | 2555 | |
9969ebc5 AE |
2556 | ret = rbd_obj_request_submit(osdc, obj_request); |
2557 | if (ret) | |
2558 | goto out_cancel; | |
2559 | ret = rbd_obj_request_wait(obj_request); | |
2560 | if (ret) | |
2561 | goto out_cancel; | |
9969ebc5 AE |
2562 | ret = obj_request->result; |
2563 | if (ret) | |
2564 | goto out_cancel; | |
2565 | ||
8eb87565 AE |
2566 | /* |
2567 | * A watch request is set to linger, so the underlying osd | |
2568 | * request won't go away until we unregister it. We retain | |
2569 | * a pointer to the object request during that time (in | |
2570 | * rbd_dev->watch_request), so we'll keep a reference to | |
2571 | * it. We'll drop that reference (below) after we've | |
2572 | * unregistered it. | |
2573 | */ | |
2574 | if (start) { | |
2575 | rbd_dev->watch_request = obj_request; | |
2576 | ||
2577 | return 0; | |
2578 | } | |
2579 | ||
2580 | /* We have successfully torn down the watch request */ | |
2581 | ||
2582 | rbd_obj_request_put(rbd_dev->watch_request); | |
2583 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2584 | out_cancel: |
2585 | /* Cancel the event if we're tearing down, or on error */ | |
2586 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2587 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2588 | if (obj_request) |
2589 | rbd_obj_request_put(obj_request); | |
2590 | ||
2591 | return ret; | |
2592 | } | |
2593 | ||
36be9a76 | 2594 | /* |
f40eb349 AE |
2595 | * Synchronous osd object method call. Returns the number of bytes |
2596 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
2597 | */ |
2598 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2599 | const char *object_name, | |
2600 | const char *class_name, | |
2601 | const char *method_name, | |
4157976b | 2602 | const void *outbound, |
36be9a76 | 2603 | size_t outbound_size, |
4157976b | 2604 | void *inbound, |
36be9a76 AE |
2605 | size_t inbound_size, |
2606 | u64 *version) | |
2607 | { | |
2169238d | 2608 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2609 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2610 | struct page **pages; |
2611 | u32 page_count; | |
2612 | int ret; | |
2613 | ||
2614 | /* | |
6010a451 AE |
2615 | * Method calls are ultimately read operations. The result |
2616 | * should placed into the inbound buffer provided. They | |
2617 | * also supply outbound data--parameters for the object | |
2618 | * method. Currently if this is present it will be a | |
2619 | * snapshot id. | |
36be9a76 | 2620 | */ |
57385b51 | 2621 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
2622 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2623 | if (IS_ERR(pages)) | |
2624 | return PTR_ERR(pages); | |
2625 | ||
2626 | ret = -ENOMEM; | |
6010a451 | 2627 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2628 | OBJ_REQUEST_PAGES); |
2629 | if (!obj_request) | |
2630 | goto out; | |
2631 | ||
2632 | obj_request->pages = pages; | |
2633 | obj_request->page_count = page_count; | |
2634 | ||
430c28c3 | 2635 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2636 | if (!obj_request->osd_req) |
2637 | goto out; | |
2638 | ||
c99d2d4a | 2639 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2640 | class_name, method_name); |
2641 | if (outbound_size) { | |
2642 | struct ceph_pagelist *pagelist; | |
2643 | ||
2644 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2645 | if (!pagelist) | |
2646 | goto out; | |
2647 | ||
2648 | ceph_pagelist_init(pagelist); | |
2649 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2650 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2651 | pagelist); | |
2652 | } | |
a4ce40a9 AE |
2653 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2654 | obj_request->pages, inbound_size, | |
44cd188d | 2655 | 0, false, false); |
9d4df01f | 2656 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2657 | |
36be9a76 AE |
2658 | ret = rbd_obj_request_submit(osdc, obj_request); |
2659 | if (ret) | |
2660 | goto out; | |
2661 | ret = rbd_obj_request_wait(obj_request); | |
2662 | if (ret) | |
2663 | goto out; | |
2664 | ||
2665 | ret = obj_request->result; | |
2666 | if (ret < 0) | |
2667 | goto out; | |
57385b51 AE |
2668 | |
2669 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
2670 | ret = (int)obj_request->xferred; | |
903bb32e | 2671 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2672 | if (version) |
2673 | *version = obj_request->version; | |
2674 | out: | |
2675 | if (obj_request) | |
2676 | rbd_obj_request_put(obj_request); | |
2677 | else | |
2678 | ceph_release_page_vector(pages, page_count); | |
2679 | ||
2680 | return ret; | |
2681 | } | |
2682 | ||
bf0d5f50 | 2683 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2684 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2685 | { |
2686 | struct rbd_device *rbd_dev = q->queuedata; | |
2687 | bool read_only = rbd_dev->mapping.read_only; | |
2688 | struct request *rq; | |
2689 | int result; | |
2690 | ||
2691 | while ((rq = blk_fetch_request(q))) { | |
2692 | bool write_request = rq_data_dir(rq) == WRITE; | |
2693 | struct rbd_img_request *img_request; | |
2694 | u64 offset; | |
2695 | u64 length; | |
2696 | ||
2697 | /* Ignore any non-FS requests that filter through. */ | |
2698 | ||
2699 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2700 | dout("%s: non-fs request type %d\n", __func__, |
2701 | (int) rq->cmd_type); | |
2702 | __blk_end_request_all(rq, 0); | |
2703 | continue; | |
2704 | } | |
2705 | ||
2706 | /* Ignore/skip any zero-length requests */ | |
2707 | ||
2708 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2709 | length = (u64) blk_rq_bytes(rq); | |
2710 | ||
2711 | if (!length) { | |
2712 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2713 | __blk_end_request_all(rq, 0); |
2714 | continue; | |
2715 | } | |
2716 | ||
2717 | spin_unlock_irq(q->queue_lock); | |
2718 | ||
2719 | /* Disallow writes to a read-only device */ | |
2720 | ||
2721 | if (write_request) { | |
2722 | result = -EROFS; | |
2723 | if (read_only) | |
2724 | goto end_request; | |
2725 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2726 | } | |
2727 | ||
6d292906 AE |
2728 | /* |
2729 | * Quit early if the mapped snapshot no longer | |
2730 | * exists. It's still possible the snapshot will | |
2731 | * have disappeared by the time our request arrives | |
2732 | * at the osd, but there's no sense in sending it if | |
2733 | * we already know. | |
2734 | */ | |
2735 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2736 | dout("request for non-existent snapshot"); |
2737 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2738 | result = -ENXIO; | |
2739 | goto end_request; | |
2740 | } | |
2741 | ||
bf0d5f50 | 2742 | result = -EINVAL; |
c0cd10db AE |
2743 | if (offset && length > U64_MAX - offset + 1) { |
2744 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n", | |
2745 | offset, length); | |
bf0d5f50 | 2746 | goto end_request; /* Shouldn't happen */ |
c0cd10db | 2747 | } |
bf0d5f50 AE |
2748 | |
2749 | result = -ENOMEM; | |
2750 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2751 | write_request, false); |
bf0d5f50 AE |
2752 | if (!img_request) |
2753 | goto end_request; | |
2754 | ||
2755 | img_request->rq = rq; | |
2756 | ||
f1a4739f AE |
2757 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2758 | rq->bio); | |
bf0d5f50 AE |
2759 | if (!result) |
2760 | result = rbd_img_request_submit(img_request); | |
2761 | if (result) | |
2762 | rbd_img_request_put(img_request); | |
2763 | end_request: | |
2764 | spin_lock_irq(q->queue_lock); | |
2765 | if (result < 0) { | |
7da22d29 AE |
2766 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2767 | write_request ? "write" : "read", | |
2768 | length, offset, result); | |
2769 | ||
bf0d5f50 AE |
2770 | __blk_end_request_all(rq, result); |
2771 | } | |
2772 | } | |
2773 | } | |
2774 | ||
602adf40 YS |
2775 | /* |
2776 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2777 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2778 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2779 | */ |
2780 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2781 | struct bio_vec *bvec) | |
2782 | { | |
2783 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2784 | sector_t sector_offset; |
2785 | sector_t sectors_per_obj; | |
2786 | sector_t obj_sector_offset; | |
2787 | int ret; | |
2788 | ||
2789 | /* | |
2790 | * Find how far into its rbd object the partition-relative | |
2791 | * bio start sector is to offset relative to the enclosing | |
2792 | * device. | |
2793 | */ | |
2794 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2795 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2796 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2797 | ||
2798 | /* | |
2799 | * Compute the number of bytes from that offset to the end | |
2800 | * of the object. Account for what's already used by the bio. | |
2801 | */ | |
2802 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2803 | if (ret > bmd->bi_size) | |
2804 | ret -= bmd->bi_size; | |
2805 | else | |
2806 | ret = 0; | |
2807 | ||
2808 | /* | |
2809 | * Don't send back more than was asked for. And if the bio | |
2810 | * was empty, let the whole thing through because: "Note | |
2811 | * that a block device *must* allow a single page to be | |
2812 | * added to an empty bio." | |
2813 | */ | |
2814 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2815 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2816 | ret = (int) bvec->bv_len; | |
2817 | ||
2818 | return ret; | |
602adf40 YS |
2819 | } |
2820 | ||
2821 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2822 | { | |
2823 | struct gendisk *disk = rbd_dev->disk; | |
2824 | ||
2825 | if (!disk) | |
2826 | return; | |
2827 | ||
a0cab924 AE |
2828 | rbd_dev->disk = NULL; |
2829 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 2830 | del_gendisk(disk); |
a0cab924 AE |
2831 | if (disk->queue) |
2832 | blk_cleanup_queue(disk->queue); | |
2833 | } | |
602adf40 YS |
2834 | put_disk(disk); |
2835 | } | |
2836 | ||
788e2df3 AE |
2837 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2838 | const char *object_name, | |
7097f8df | 2839 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
2840 | |
2841 | { | |
2169238d | 2842 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2843 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2844 | struct page **pages = NULL; |
2845 | u32 page_count; | |
1ceae7ef | 2846 | size_t size; |
788e2df3 AE |
2847 | int ret; |
2848 | ||
2849 | page_count = (u32) calc_pages_for(offset, length); | |
2850 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2851 | if (IS_ERR(pages)) | |
2852 | ret = PTR_ERR(pages); | |
2853 | ||
2854 | ret = -ENOMEM; | |
2855 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2856 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2857 | if (!obj_request) |
2858 | goto out; | |
2859 | ||
2860 | obj_request->pages = pages; | |
2861 | obj_request->page_count = page_count; | |
2862 | ||
430c28c3 | 2863 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2864 | if (!obj_request->osd_req) |
2865 | goto out; | |
2866 | ||
c99d2d4a AE |
2867 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2868 | offset, length, 0, 0); | |
406e2c9f | 2869 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2870 | obj_request->pages, |
44cd188d AE |
2871 | obj_request->length, |
2872 | obj_request->offset & ~PAGE_MASK, | |
2873 | false, false); | |
9d4df01f | 2874 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2875 | |
788e2df3 AE |
2876 | ret = rbd_obj_request_submit(osdc, obj_request); |
2877 | if (ret) | |
2878 | goto out; | |
2879 | ret = rbd_obj_request_wait(obj_request); | |
2880 | if (ret) | |
2881 | goto out; | |
2882 | ||
2883 | ret = obj_request->result; | |
2884 | if (ret < 0) | |
2885 | goto out; | |
1ceae7ef AE |
2886 | |
2887 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2888 | size = (size_t) obj_request->xferred; | |
903bb32e | 2889 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
2890 | rbd_assert(size <= (size_t)INT_MAX); |
2891 | ret = (int)size; | |
788e2df3 AE |
2892 | out: |
2893 | if (obj_request) | |
2894 | rbd_obj_request_put(obj_request); | |
2895 | else | |
2896 | ceph_release_page_vector(pages, page_count); | |
2897 | ||
2898 | return ret; | |
2899 | } | |
2900 | ||
602adf40 | 2901 | /* |
4156d998 AE |
2902 | * Read the complete header for the given rbd device. |
2903 | * | |
2904 | * Returns a pointer to a dynamically-allocated buffer containing | |
2905 | * the complete and validated header. Caller can pass the address | |
2906 | * of a variable that will be filled in with the version of the | |
2907 | * header object at the time it was read. | |
2908 | * | |
2909 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2910 | */ |
4156d998 | 2911 | static struct rbd_image_header_ondisk * |
7097f8df | 2912 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev) |
602adf40 | 2913 | { |
4156d998 | 2914 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2915 | u32 snap_count = 0; |
4156d998 AE |
2916 | u64 names_size = 0; |
2917 | u32 want_count; | |
2918 | int ret; | |
602adf40 | 2919 | |
00f1f36f | 2920 | /* |
4156d998 AE |
2921 | * The complete header will include an array of its 64-bit |
2922 | * snapshot ids, followed by the names of those snapshots as | |
2923 | * a contiguous block of NUL-terminated strings. Note that | |
2924 | * the number of snapshots could change by the time we read | |
2925 | * it in, in which case we re-read it. | |
00f1f36f | 2926 | */ |
4156d998 AE |
2927 | do { |
2928 | size_t size; | |
2929 | ||
2930 | kfree(ondisk); | |
2931 | ||
2932 | size = sizeof (*ondisk); | |
2933 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
2934 | size += names_size; | |
2935 | ondisk = kmalloc(size, GFP_KERNEL); | |
2936 | if (!ondisk) | |
2937 | return ERR_PTR(-ENOMEM); | |
2938 | ||
788e2df3 | 2939 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 2940 | 0, size, ondisk); |
4156d998 AE |
2941 | if (ret < 0) |
2942 | goto out_err; | |
c0cd10db | 2943 | if ((size_t)ret < size) { |
4156d998 | 2944 | ret = -ENXIO; |
06ecc6cb AE |
2945 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2946 | size, ret); | |
4156d998 AE |
2947 | goto out_err; |
2948 | } | |
2949 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
2950 | ret = -ENXIO; | |
06ecc6cb | 2951 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 2952 | goto out_err; |
81e759fb | 2953 | } |
602adf40 | 2954 | |
4156d998 AE |
2955 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2956 | want_count = snap_count; | |
2957 | snap_count = le32_to_cpu(ondisk->snap_count); | |
2958 | } while (snap_count != want_count); | |
00f1f36f | 2959 | |
4156d998 | 2960 | return ondisk; |
00f1f36f | 2961 | |
4156d998 AE |
2962 | out_err: |
2963 | kfree(ondisk); | |
2964 | ||
2965 | return ERR_PTR(ret); | |
2966 | } | |
2967 | ||
2968 | /* | |
2969 | * reload the ondisk the header | |
2970 | */ | |
2971 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
2972 | struct rbd_image_header *header) | |
2973 | { | |
2974 | struct rbd_image_header_ondisk *ondisk; | |
4156d998 | 2975 | int ret; |
602adf40 | 2976 | |
7097f8df | 2977 | ondisk = rbd_dev_v1_header_read(rbd_dev); |
4156d998 AE |
2978 | if (IS_ERR(ondisk)) |
2979 | return PTR_ERR(ondisk); | |
2980 | ret = rbd_header_from_disk(header, ondisk); | |
4156d998 AE |
2981 | kfree(ondisk); |
2982 | ||
2983 | return ret; | |
602adf40 YS |
2984 | } |
2985 | ||
41f38c2b | 2986 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
2987 | { |
2988 | struct rbd_snap *snap; | |
a0593290 | 2989 | struct rbd_snap *next; |
dfc5606d | 2990 | |
6087b51b AE |
2991 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) { |
2992 | list_del(&snap->node); | |
2993 | rbd_snap_destroy(snap); | |
2994 | } | |
dfc5606d YS |
2995 | } |
2996 | ||
9478554a AE |
2997 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
2998 | { | |
0d7dbfce | 2999 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
3000 | return; |
3001 | ||
e28626a0 AE |
3002 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) { |
3003 | sector_t size; | |
3004 | ||
3005 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
3006 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3007 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3008 | set_capacity(rbd_dev->disk, size); | |
3009 | } | |
9478554a AE |
3010 | } |
3011 | ||
602adf40 YS |
3012 | /* |
3013 | * only read the first part of the ondisk header, without the snaps info | |
3014 | */ | |
cc4a38bd | 3015 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev) |
602adf40 YS |
3016 | { |
3017 | int ret; | |
3018 | struct rbd_image_header h; | |
602adf40 YS |
3019 | |
3020 | ret = rbd_read_header(rbd_dev, &h); | |
3021 | if (ret < 0) | |
3022 | return ret; | |
3023 | ||
a51aa0c0 JD |
3024 | down_write(&rbd_dev->header_rwsem); |
3025 | ||
9478554a AE |
3026 | /* Update image size, and check for resize of mapped image */ |
3027 | rbd_dev->header.image_size = h.image_size; | |
3028 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 3029 | |
849b4260 | 3030 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3031 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3032 | kfree(rbd_dev->header.snap_names); |
d1d25646 | 3033 | /* osd requests may still refer to snapc */ |
812164f8 | 3034 | ceph_put_snap_context(rbd_dev->header.snapc); |
602adf40 | 3035 | |
93a24e08 | 3036 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3037 | rbd_dev->header.snapc = h.snapc; |
3038 | rbd_dev->header.snap_names = h.snap_names; | |
3039 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 | 3040 | /* Free the extra copy of the object prefix */ |
c0cd10db AE |
3041 | if (strcmp(rbd_dev->header.object_prefix, h.object_prefix)) |
3042 | rbd_warn(rbd_dev, "object prefix changed (ignoring)"); | |
849b4260 AE |
3043 | kfree(h.object_prefix); |
3044 | ||
304f6808 | 3045 | ret = rbd_dev_snaps_update(rbd_dev); |
dfc5606d | 3046 | |
c666601a | 3047 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3048 | |
dfc5606d | 3049 | return ret; |
602adf40 YS |
3050 | } |
3051 | ||
cc4a38bd | 3052 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3053 | { |
a3fbe5d4 | 3054 | u64 image_size; |
1fe5e993 AE |
3055 | int ret; |
3056 | ||
117973fb | 3057 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
a3fbe5d4 | 3058 | image_size = rbd_dev->header.image_size; |
1fe5e993 | 3059 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb | 3060 | if (rbd_dev->image_format == 1) |
cc4a38bd | 3061 | ret = rbd_dev_v1_refresh(rbd_dev); |
117973fb | 3062 | else |
cc4a38bd | 3063 | ret = rbd_dev_v2_refresh(rbd_dev); |
1fe5e993 | 3064 | mutex_unlock(&ctl_mutex); |
522a0cc0 AE |
3065 | if (ret) |
3066 | rbd_warn(rbd_dev, "got notification but failed to " | |
3067 | " update snaps: %d\n", ret); | |
a3fbe5d4 AE |
3068 | if (image_size != rbd_dev->header.image_size) |
3069 | revalidate_disk(rbd_dev->disk); | |
1fe5e993 AE |
3070 | |
3071 | return ret; | |
3072 | } | |
3073 | ||
602adf40 YS |
3074 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3075 | { | |
3076 | struct gendisk *disk; | |
3077 | struct request_queue *q; | |
593a9e7b | 3078 | u64 segment_size; |
602adf40 | 3079 | |
602adf40 | 3080 | /* create gendisk info */ |
602adf40 YS |
3081 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3082 | if (!disk) | |
1fcdb8aa | 3083 | return -ENOMEM; |
602adf40 | 3084 | |
f0f8cef5 | 3085 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3086 | rbd_dev->dev_id); |
602adf40 YS |
3087 | disk->major = rbd_dev->major; |
3088 | disk->first_minor = 0; | |
3089 | disk->fops = &rbd_bd_ops; | |
3090 | disk->private_data = rbd_dev; | |
3091 | ||
bf0d5f50 | 3092 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3093 | if (!q) |
3094 | goto out_disk; | |
029bcbd8 | 3095 | |
593a9e7b AE |
3096 | /* We use the default size, but let's be explicit about it. */ |
3097 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3098 | ||
029bcbd8 | 3099 | /* set io sizes to object size */ |
593a9e7b AE |
3100 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3101 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3102 | blk_queue_max_segment_size(q, segment_size); | |
3103 | blk_queue_io_min(q, segment_size); | |
3104 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3105 | |
602adf40 YS |
3106 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3107 | disk->queue = q; | |
3108 | ||
3109 | q->queuedata = rbd_dev; | |
3110 | ||
3111 | rbd_dev->disk = disk; | |
602adf40 | 3112 | |
602adf40 | 3113 | return 0; |
602adf40 YS |
3114 | out_disk: |
3115 | put_disk(disk); | |
1fcdb8aa AE |
3116 | |
3117 | return -ENOMEM; | |
602adf40 YS |
3118 | } |
3119 | ||
dfc5606d YS |
3120 | /* |
3121 | sysfs | |
3122 | */ | |
3123 | ||
593a9e7b AE |
3124 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3125 | { | |
3126 | return container_of(dev, struct rbd_device, dev); | |
3127 | } | |
3128 | ||
dfc5606d YS |
3129 | static ssize_t rbd_size_show(struct device *dev, |
3130 | struct device_attribute *attr, char *buf) | |
3131 | { | |
593a9e7b | 3132 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3133 | |
fc71d833 AE |
3134 | return sprintf(buf, "%llu\n", |
3135 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3136 | } |
3137 | ||
34b13184 AE |
3138 | /* |
3139 | * Note this shows the features for whatever's mapped, which is not | |
3140 | * necessarily the base image. | |
3141 | */ | |
3142 | static ssize_t rbd_features_show(struct device *dev, | |
3143 | struct device_attribute *attr, char *buf) | |
3144 | { | |
3145 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3146 | ||
3147 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3148 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3149 | } |
3150 | ||
dfc5606d YS |
3151 | static ssize_t rbd_major_show(struct device *dev, |
3152 | struct device_attribute *attr, char *buf) | |
3153 | { | |
593a9e7b | 3154 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3155 | |
fc71d833 AE |
3156 | if (rbd_dev->major) |
3157 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3158 | ||
3159 | return sprintf(buf, "(none)\n"); | |
3160 | ||
dfc5606d YS |
3161 | } |
3162 | ||
3163 | static ssize_t rbd_client_id_show(struct device *dev, | |
3164 | struct device_attribute *attr, char *buf) | |
602adf40 | 3165 | { |
593a9e7b | 3166 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3167 | |
1dbb4399 AE |
3168 | return sprintf(buf, "client%lld\n", |
3169 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3170 | } |
3171 | ||
dfc5606d YS |
3172 | static ssize_t rbd_pool_show(struct device *dev, |
3173 | struct device_attribute *attr, char *buf) | |
602adf40 | 3174 | { |
593a9e7b | 3175 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3176 | |
0d7dbfce | 3177 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3178 | } |
3179 | ||
9bb2f334 AE |
3180 | static ssize_t rbd_pool_id_show(struct device *dev, |
3181 | struct device_attribute *attr, char *buf) | |
3182 | { | |
3183 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3184 | ||
0d7dbfce | 3185 | return sprintf(buf, "%llu\n", |
fc71d833 | 3186 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3187 | } |
3188 | ||
dfc5606d YS |
3189 | static ssize_t rbd_name_show(struct device *dev, |
3190 | struct device_attribute *attr, char *buf) | |
3191 | { | |
593a9e7b | 3192 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3193 | |
a92ffdf8 AE |
3194 | if (rbd_dev->spec->image_name) |
3195 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3196 | ||
3197 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3198 | } |
3199 | ||
589d30e0 AE |
3200 | static ssize_t rbd_image_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 | 3205 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3206 | } |
3207 | ||
34b13184 AE |
3208 | /* |
3209 | * Shows the name of the currently-mapped snapshot (or | |
3210 | * RBD_SNAP_HEAD_NAME for the base image). | |
3211 | */ | |
dfc5606d YS |
3212 | static ssize_t rbd_snap_show(struct device *dev, |
3213 | struct device_attribute *attr, | |
3214 | char *buf) | |
3215 | { | |
593a9e7b | 3216 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3217 | |
0d7dbfce | 3218 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3219 | } |
3220 | ||
86b00e0d AE |
3221 | /* |
3222 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3223 | * for the parent image. If there is no parent, simply shows | |
3224 | * "(no parent image)". | |
3225 | */ | |
3226 | static ssize_t rbd_parent_show(struct device *dev, | |
3227 | struct device_attribute *attr, | |
3228 | char *buf) | |
3229 | { | |
3230 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3231 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3232 | int count; | |
3233 | char *bufp = buf; | |
3234 | ||
3235 | if (!spec) | |
3236 | return sprintf(buf, "(no parent image)\n"); | |
3237 | ||
3238 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3239 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3240 | if (count < 0) | |
3241 | return count; | |
3242 | bufp += count; | |
3243 | ||
3244 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3245 | spec->image_name ? spec->image_name : "(unknown)"); | |
3246 | if (count < 0) | |
3247 | return count; | |
3248 | bufp += count; | |
3249 | ||
3250 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3251 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3252 | if (count < 0) | |
3253 | return count; | |
3254 | bufp += count; | |
3255 | ||
3256 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3257 | if (count < 0) | |
3258 | return count; | |
3259 | bufp += count; | |
3260 | ||
3261 | return (ssize_t) (bufp - buf); | |
3262 | } | |
3263 | ||
dfc5606d YS |
3264 | static ssize_t rbd_image_refresh(struct device *dev, |
3265 | struct device_attribute *attr, | |
3266 | const char *buf, | |
3267 | size_t size) | |
3268 | { | |
593a9e7b | 3269 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3270 | int ret; |
602adf40 | 3271 | |
cc4a38bd | 3272 | ret = rbd_dev_refresh(rbd_dev); |
b813623a AE |
3273 | |
3274 | return ret < 0 ? ret : size; | |
dfc5606d | 3275 | } |
602adf40 | 3276 | |
dfc5606d | 3277 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3278 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3279 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3280 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3281 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3282 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3283 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3284 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3285 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3286 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3287 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3288 | |
3289 | static struct attribute *rbd_attrs[] = { | |
3290 | &dev_attr_size.attr, | |
34b13184 | 3291 | &dev_attr_features.attr, |
dfc5606d YS |
3292 | &dev_attr_major.attr, |
3293 | &dev_attr_client_id.attr, | |
3294 | &dev_attr_pool.attr, | |
9bb2f334 | 3295 | &dev_attr_pool_id.attr, |
dfc5606d | 3296 | &dev_attr_name.attr, |
589d30e0 | 3297 | &dev_attr_image_id.attr, |
dfc5606d | 3298 | &dev_attr_current_snap.attr, |
86b00e0d | 3299 | &dev_attr_parent.attr, |
dfc5606d | 3300 | &dev_attr_refresh.attr, |
dfc5606d YS |
3301 | NULL |
3302 | }; | |
3303 | ||
3304 | static struct attribute_group rbd_attr_group = { | |
3305 | .attrs = rbd_attrs, | |
3306 | }; | |
3307 | ||
3308 | static const struct attribute_group *rbd_attr_groups[] = { | |
3309 | &rbd_attr_group, | |
3310 | NULL | |
3311 | }; | |
3312 | ||
3313 | static void rbd_sysfs_dev_release(struct device *dev) | |
3314 | { | |
3315 | } | |
3316 | ||
3317 | static struct device_type rbd_device_type = { | |
3318 | .name = "rbd", | |
3319 | .groups = rbd_attr_groups, | |
3320 | .release = rbd_sysfs_dev_release, | |
3321 | }; | |
3322 | ||
8b8fb99c AE |
3323 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3324 | { | |
3325 | kref_get(&spec->kref); | |
3326 | ||
3327 | return spec; | |
3328 | } | |
3329 | ||
3330 | static void rbd_spec_free(struct kref *kref); | |
3331 | static void rbd_spec_put(struct rbd_spec *spec) | |
3332 | { | |
3333 | if (spec) | |
3334 | kref_put(&spec->kref, rbd_spec_free); | |
3335 | } | |
3336 | ||
3337 | static struct rbd_spec *rbd_spec_alloc(void) | |
3338 | { | |
3339 | struct rbd_spec *spec; | |
3340 | ||
3341 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3342 | if (!spec) | |
3343 | return NULL; | |
3344 | kref_init(&spec->kref); | |
3345 | ||
8b8fb99c AE |
3346 | return spec; |
3347 | } | |
3348 | ||
3349 | static void rbd_spec_free(struct kref *kref) | |
3350 | { | |
3351 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3352 | ||
3353 | kfree(spec->pool_name); | |
3354 | kfree(spec->image_id); | |
3355 | kfree(spec->image_name); | |
3356 | kfree(spec->snap_name); | |
3357 | kfree(spec); | |
3358 | } | |
3359 | ||
cc344fa1 | 3360 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3361 | struct rbd_spec *spec) |
3362 | { | |
3363 | struct rbd_device *rbd_dev; | |
3364 | ||
3365 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3366 | if (!rbd_dev) | |
3367 | return NULL; | |
3368 | ||
3369 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3370 | rbd_dev->flags = 0; |
c53d5893 AE |
3371 | INIT_LIST_HEAD(&rbd_dev->node); |
3372 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
3373 | init_rwsem(&rbd_dev->header_rwsem); | |
3374 | ||
3375 | rbd_dev->spec = spec; | |
3376 | rbd_dev->rbd_client = rbdc; | |
3377 | ||
0903e875 AE |
3378 | /* Initialize the layout used for all rbd requests */ |
3379 | ||
3380 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3381 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3382 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3383 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3384 | ||
c53d5893 AE |
3385 | return rbd_dev; |
3386 | } | |
3387 | ||
3388 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3389 | { | |
c53d5893 AE |
3390 | rbd_put_client(rbd_dev->rbd_client); |
3391 | rbd_spec_put(rbd_dev->spec); | |
3392 | kfree(rbd_dev); | |
3393 | } | |
3394 | ||
6087b51b | 3395 | static void rbd_snap_destroy(struct rbd_snap *snap) |
dfc5606d | 3396 | { |
3e83b65b AE |
3397 | kfree(snap->name); |
3398 | kfree(snap); | |
dfc5606d YS |
3399 | } |
3400 | ||
6087b51b | 3401 | static struct rbd_snap *rbd_snap_create(struct rbd_device *rbd_dev, |
c8d18425 | 3402 | const char *snap_name, |
34b13184 AE |
3403 | u64 snap_id, u64 snap_size, |
3404 | u64 snap_features) | |
dfc5606d | 3405 | { |
4e891e0a | 3406 | struct rbd_snap *snap; |
4e891e0a AE |
3407 | |
3408 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 3409 | if (!snap) |
4e891e0a AE |
3410 | return ERR_PTR(-ENOMEM); |
3411 | ||
6e584f52 | 3412 | snap->name = snap_name; |
c8d18425 AE |
3413 | snap->id = snap_id; |
3414 | snap->size = snap_size; | |
34b13184 | 3415 | snap->features = snap_features; |
4e891e0a AE |
3416 | |
3417 | return snap; | |
dfc5606d YS |
3418 | } |
3419 | ||
6e584f52 AE |
3420 | /* |
3421 | * Returns a dynamically-allocated snapshot name if successful, or a | |
3422 | * pointer-coded error otherwise. | |
3423 | */ | |
cb75223d | 3424 | static const char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
cd892126 AE |
3425 | u64 *snap_size, u64 *snap_features) |
3426 | { | |
cb75223d | 3427 | const char *snap_name; |
6e584f52 | 3428 | int i; |
cd892126 AE |
3429 | |
3430 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
3431 | ||
cd892126 AE |
3432 | /* Skip over names until we find the one we are looking for */ |
3433 | ||
3434 | snap_name = rbd_dev->header.snap_names; | |
6e584f52 | 3435 | for (i = 0; i < which; i++) |
cd892126 AE |
3436 | snap_name += strlen(snap_name) + 1; |
3437 | ||
6e584f52 AE |
3438 | snap_name = kstrdup(snap_name, GFP_KERNEL); |
3439 | if (!snap_name) | |
3440 | return ERR_PTR(-ENOMEM); | |
3441 | ||
3442 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
3443 | *snap_features = 0; /* No features for v1 */ | |
3444 | ||
cd892126 AE |
3445 | return snap_name; |
3446 | } | |
3447 | ||
9d475de5 AE |
3448 | /* |
3449 | * Get the size and object order for an image snapshot, or if | |
3450 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3451 | * image. | |
3452 | */ | |
3453 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3454 | u8 *order, u64 *snap_size) | |
3455 | { | |
3456 | __le64 snapid = cpu_to_le64(snap_id); | |
3457 | int ret; | |
3458 | struct { | |
3459 | u8 order; | |
3460 | __le64 size; | |
3461 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3462 | ||
36be9a76 | 3463 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3464 | "rbd", "get_size", |
4157976b AE |
3465 | &snapid, sizeof (snapid), |
3466 | &size_buf, sizeof (size_buf), NULL); | |
36be9a76 | 3467 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3468 | if (ret < 0) |
3469 | return ret; | |
57385b51 AE |
3470 | if (ret < sizeof (size_buf)) |
3471 | return -ERANGE; | |
9d475de5 | 3472 | |
c86f86e9 AE |
3473 | if (order) |
3474 | *order = size_buf.order; | |
9d475de5 AE |
3475 | *snap_size = le64_to_cpu(size_buf.size); |
3476 | ||
3477 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
57385b51 AE |
3478 | (unsigned long long)snap_id, (unsigned int)*order, |
3479 | (unsigned long long)*snap_size); | |
9d475de5 AE |
3480 | |
3481 | return 0; | |
3482 | } | |
3483 | ||
3484 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3485 | { | |
3486 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3487 | &rbd_dev->header.obj_order, | |
3488 | &rbd_dev->header.image_size); | |
3489 | } | |
3490 | ||
1e130199 AE |
3491 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3492 | { | |
3493 | void *reply_buf; | |
3494 | int ret; | |
3495 | void *p; | |
3496 | ||
3497 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3498 | if (!reply_buf) | |
3499 | return -ENOMEM; | |
3500 | ||
36be9a76 | 3501 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3502 | "rbd", "get_object_prefix", NULL, 0, |
07b2391f | 3503 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
36be9a76 | 3504 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3505 | if (ret < 0) |
3506 | goto out; | |
3507 | ||
3508 | p = reply_buf; | |
3509 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3510 | p + ret, NULL, GFP_NOIO); |
3511 | ret = 0; | |
1e130199 AE |
3512 | |
3513 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3514 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3515 | rbd_dev->header.object_prefix = NULL; | |
3516 | } else { | |
3517 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3518 | } | |
1e130199 AE |
3519 | out: |
3520 | kfree(reply_buf); | |
3521 | ||
3522 | return ret; | |
3523 | } | |
3524 | ||
b1b5402a AE |
3525 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3526 | u64 *snap_features) | |
3527 | { | |
3528 | __le64 snapid = cpu_to_le64(snap_id); | |
3529 | struct { | |
3530 | __le64 features; | |
3531 | __le64 incompat; | |
4157976b | 3532 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3533 | u64 incompat; |
b1b5402a AE |
3534 | int ret; |
3535 | ||
36be9a76 | 3536 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3537 | "rbd", "get_features", |
4157976b AE |
3538 | &snapid, sizeof (snapid), |
3539 | &features_buf, sizeof (features_buf), NULL); | |
36be9a76 | 3540 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3541 | if (ret < 0) |
3542 | return ret; | |
57385b51 AE |
3543 | if (ret < sizeof (features_buf)) |
3544 | return -ERANGE; | |
d889140c AE |
3545 | |
3546 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3547 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3548 | return -ENXIO; |
d889140c | 3549 | |
b1b5402a AE |
3550 | *snap_features = le64_to_cpu(features_buf.features); |
3551 | ||
3552 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
3553 | (unsigned long long)snap_id, |
3554 | (unsigned long long)*snap_features, | |
3555 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
3556 | |
3557 | return 0; | |
3558 | } | |
3559 | ||
3560 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3561 | { | |
3562 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3563 | &rbd_dev->header.features); | |
3564 | } | |
3565 | ||
86b00e0d AE |
3566 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3567 | { | |
3568 | struct rbd_spec *parent_spec; | |
3569 | size_t size; | |
3570 | void *reply_buf = NULL; | |
3571 | __le64 snapid; | |
3572 | void *p; | |
3573 | void *end; | |
3574 | char *image_id; | |
3575 | u64 overlap; | |
86b00e0d AE |
3576 | int ret; |
3577 | ||
3578 | parent_spec = rbd_spec_alloc(); | |
3579 | if (!parent_spec) | |
3580 | return -ENOMEM; | |
3581 | ||
3582 | size = sizeof (__le64) + /* pool_id */ | |
3583 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3584 | sizeof (__le64) + /* snap_id */ | |
3585 | sizeof (__le64); /* overlap */ | |
3586 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3587 | if (!reply_buf) { | |
3588 | ret = -ENOMEM; | |
3589 | goto out_err; | |
3590 | } | |
3591 | ||
3592 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3593 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 3594 | "rbd", "get_parent", |
4157976b AE |
3595 | &snapid, sizeof (snapid), |
3596 | reply_buf, size, NULL); | |
36be9a76 | 3597 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3598 | if (ret < 0) |
3599 | goto out_err; | |
3600 | ||
86b00e0d | 3601 | p = reply_buf; |
57385b51 AE |
3602 | end = reply_buf + ret; |
3603 | ret = -ERANGE; | |
86b00e0d AE |
3604 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
3605 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3606 | goto out; /* No parent? No problem. */ | |
3607 | ||
0903e875 AE |
3608 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3609 | ||
3610 | ret = -EIO; | |
c0cd10db AE |
3611 | if (parent_spec->pool_id > (u64)U32_MAX) { |
3612 | rbd_warn(NULL, "parent pool id too large (%llu > %u)\n", | |
3613 | (unsigned long long)parent_spec->pool_id, U32_MAX); | |
57385b51 | 3614 | goto out_err; |
c0cd10db | 3615 | } |
0903e875 | 3616 | |
979ed480 | 3617 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3618 | if (IS_ERR(image_id)) { |
3619 | ret = PTR_ERR(image_id); | |
3620 | goto out_err; | |
3621 | } | |
3622 | parent_spec->image_id = image_id; | |
3623 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3624 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3625 | ||
3626 | rbd_dev->parent_overlap = overlap; | |
3627 | rbd_dev->parent_spec = parent_spec; | |
3628 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3629 | out: | |
3630 | ret = 0; | |
3631 | out_err: | |
3632 | kfree(reply_buf); | |
3633 | rbd_spec_put(parent_spec); | |
3634 | ||
3635 | return ret; | |
3636 | } | |
3637 | ||
cc070d59 AE |
3638 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
3639 | { | |
3640 | struct { | |
3641 | __le64 stripe_unit; | |
3642 | __le64 stripe_count; | |
3643 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
3644 | size_t size = sizeof (striping_info_buf); | |
3645 | void *p; | |
3646 | u64 obj_size; | |
3647 | u64 stripe_unit; | |
3648 | u64 stripe_count; | |
3649 | int ret; | |
3650 | ||
3651 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
3652 | "rbd", "get_stripe_unit_count", NULL, 0, | |
3653 | (char *)&striping_info_buf, size, NULL); | |
3654 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); | |
3655 | if (ret < 0) | |
3656 | return ret; | |
3657 | if (ret < size) | |
3658 | return -ERANGE; | |
3659 | ||
3660 | /* | |
3661 | * We don't actually support the "fancy striping" feature | |
3662 | * (STRIPINGV2) yet, but if the striping sizes are the | |
3663 | * defaults the behavior is the same as before. So find | |
3664 | * out, and only fail if the image has non-default values. | |
3665 | */ | |
3666 | ret = -EINVAL; | |
3667 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
3668 | p = &striping_info_buf; | |
3669 | stripe_unit = ceph_decode_64(&p); | |
3670 | if (stripe_unit != obj_size) { | |
3671 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
3672 | "(got %llu want %llu)", | |
3673 | stripe_unit, obj_size); | |
3674 | return -EINVAL; | |
3675 | } | |
3676 | stripe_count = ceph_decode_64(&p); | |
3677 | if (stripe_count != 1) { | |
3678 | rbd_warn(rbd_dev, "unsupported stripe count " | |
3679 | "(got %llu want 1)", stripe_count); | |
3680 | return -EINVAL; | |
3681 | } | |
500d0c0f AE |
3682 | rbd_dev->header.stripe_unit = stripe_unit; |
3683 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
3684 | |
3685 | return 0; | |
3686 | } | |
3687 | ||
9e15b77d AE |
3688 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3689 | { | |
3690 | size_t image_id_size; | |
3691 | char *image_id; | |
3692 | void *p; | |
3693 | void *end; | |
3694 | size_t size; | |
3695 | void *reply_buf = NULL; | |
3696 | size_t len = 0; | |
3697 | char *image_name = NULL; | |
3698 | int ret; | |
3699 | ||
3700 | rbd_assert(!rbd_dev->spec->image_name); | |
3701 | ||
69e7a02f AE |
3702 | len = strlen(rbd_dev->spec->image_id); |
3703 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3704 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3705 | if (!image_id) | |
3706 | return NULL; | |
3707 | ||
3708 | p = image_id; | |
4157976b | 3709 | end = image_id + image_id_size; |
57385b51 | 3710 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
3711 | |
3712 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3713 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3714 | if (!reply_buf) | |
3715 | goto out; | |
3716 | ||
36be9a76 | 3717 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3718 | "rbd", "dir_get_name", |
3719 | image_id, image_id_size, | |
4157976b | 3720 | reply_buf, size, NULL); |
9e15b77d AE |
3721 | if (ret < 0) |
3722 | goto out; | |
3723 | p = reply_buf; | |
f40eb349 AE |
3724 | end = reply_buf + ret; |
3725 | ||
9e15b77d AE |
3726 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3727 | if (IS_ERR(image_name)) | |
3728 | image_name = NULL; | |
3729 | else | |
3730 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3731 | out: | |
3732 | kfree(reply_buf); | |
3733 | kfree(image_id); | |
3734 | ||
3735 | return image_name; | |
3736 | } | |
3737 | ||
3738 | /* | |
2e9f7f1c AE |
3739 | * When an rbd image has a parent image, it is identified by the |
3740 | * pool, image, and snapshot ids (not names). This function fills | |
3741 | * in the names for those ids. (It's OK if we can't figure out the | |
3742 | * name for an image id, but the pool and snapshot ids should always | |
3743 | * exist and have names.) All names in an rbd spec are dynamically | |
3744 | * allocated. | |
e1d4213f AE |
3745 | * |
3746 | * When an image being mapped (not a parent) is probed, we have the | |
3747 | * pool name and pool id, image name and image id, and the snapshot | |
3748 | * name. The only thing we're missing is the snapshot id. | |
2e9f7f1c AE |
3749 | * |
3750 | * The set of snapshots for an image is not known until they have | |
3751 | * been read by rbd_dev_snaps_update(), so we can't completely fill | |
3752 | * in this information until after that has been called. | |
9e15b77d | 3753 | */ |
2e9f7f1c | 3754 | static int rbd_dev_spec_update(struct rbd_device *rbd_dev) |
9e15b77d | 3755 | { |
2e9f7f1c AE |
3756 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3757 | struct rbd_spec *spec = rbd_dev->spec; | |
3758 | const char *pool_name; | |
3759 | const char *image_name; | |
3760 | const char *snap_name; | |
9e15b77d AE |
3761 | int ret; |
3762 | ||
e1d4213f AE |
3763 | /* |
3764 | * An image being mapped will have the pool name (etc.), but | |
3765 | * we need to look up the snapshot id. | |
3766 | */ | |
2e9f7f1c AE |
3767 | if (spec->pool_name) { |
3768 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
e1d4213f AE |
3769 | struct rbd_snap *snap; |
3770 | ||
2e9f7f1c | 3771 | snap = snap_by_name(rbd_dev, spec->snap_name); |
e1d4213f AE |
3772 | if (!snap) |
3773 | return -ENOENT; | |
2e9f7f1c | 3774 | spec->snap_id = snap->id; |
e1d4213f | 3775 | } else { |
2e9f7f1c | 3776 | spec->snap_id = CEPH_NOSNAP; |
e1d4213f AE |
3777 | } |
3778 | ||
3779 | return 0; | |
3780 | } | |
9e15b77d | 3781 | |
2e9f7f1c | 3782 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 3783 | |
2e9f7f1c AE |
3784 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
3785 | if (!pool_name) { | |
3786 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
3787 | return -EIO; |
3788 | } | |
2e9f7f1c AE |
3789 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
3790 | if (!pool_name) | |
9e15b77d AE |
3791 | return -ENOMEM; |
3792 | ||
3793 | /* Fetch the image name; tolerate failure here */ | |
3794 | ||
2e9f7f1c AE |
3795 | image_name = rbd_dev_image_name(rbd_dev); |
3796 | if (!image_name) | |
06ecc6cb | 3797 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 3798 | |
2e9f7f1c | 3799 | /* Look up the snapshot name, and make a copy */ |
9e15b77d | 3800 | |
2e9f7f1c AE |
3801 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
3802 | if (!snap_name) { | |
3803 | rbd_warn(rbd_dev, "no snapshot with id %llu", spec->snap_id); | |
9e15b77d AE |
3804 | ret = -EIO; |
3805 | goto out_err; | |
3806 | } | |
2e9f7f1c AE |
3807 | snap_name = kstrdup(snap_name, GFP_KERNEL); |
3808 | if (!snap_name) { | |
3809 | ret = -ENOMEM; | |
9e15b77d | 3810 | goto out_err; |
2e9f7f1c AE |
3811 | } |
3812 | ||
3813 | spec->pool_name = pool_name; | |
3814 | spec->image_name = image_name; | |
3815 | spec->snap_name = snap_name; | |
9e15b77d AE |
3816 | |
3817 | return 0; | |
3818 | out_err: | |
2e9f7f1c AE |
3819 | kfree(image_name); |
3820 | kfree(pool_name); | |
9e15b77d AE |
3821 | |
3822 | return ret; | |
3823 | } | |
3824 | ||
cc4a38bd | 3825 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
3826 | { |
3827 | size_t size; | |
3828 | int ret; | |
3829 | void *reply_buf; | |
3830 | void *p; | |
3831 | void *end; | |
3832 | u64 seq; | |
3833 | u32 snap_count; | |
3834 | struct ceph_snap_context *snapc; | |
3835 | u32 i; | |
3836 | ||
3837 | /* | |
3838 | * We'll need room for the seq value (maximum snapshot id), | |
3839 | * snapshot count, and array of that many snapshot ids. | |
3840 | * For now we have a fixed upper limit on the number we're | |
3841 | * prepared to receive. | |
3842 | */ | |
3843 | size = sizeof (__le64) + sizeof (__le32) + | |
3844 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3845 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3846 | if (!reply_buf) | |
3847 | return -ENOMEM; | |
3848 | ||
36be9a76 | 3849 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3850 | "rbd", "get_snapcontext", NULL, 0, |
cc4a38bd | 3851 | reply_buf, size, NULL); |
36be9a76 | 3852 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3853 | if (ret < 0) |
3854 | goto out; | |
3855 | ||
35d489f9 | 3856 | p = reply_buf; |
57385b51 AE |
3857 | end = reply_buf + ret; |
3858 | ret = -ERANGE; | |
35d489f9 AE |
3859 | ceph_decode_64_safe(&p, end, seq, out); |
3860 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3861 | ||
3862 | /* | |
3863 | * Make sure the reported number of snapshot ids wouldn't go | |
3864 | * beyond the end of our buffer. But before checking that, | |
3865 | * make sure the computed size of the snapshot context we | |
3866 | * allocate is representable in a size_t. | |
3867 | */ | |
3868 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3869 | / sizeof (u64)) { | |
3870 | ret = -EINVAL; | |
3871 | goto out; | |
3872 | } | |
3873 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3874 | goto out; | |
468521c1 | 3875 | ret = 0; |
35d489f9 | 3876 | |
812164f8 | 3877 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
3878 | if (!snapc) { |
3879 | ret = -ENOMEM; | |
3880 | goto out; | |
3881 | } | |
35d489f9 | 3882 | snapc->seq = seq; |
35d489f9 AE |
3883 | for (i = 0; i < snap_count; i++) |
3884 | snapc->snaps[i] = ceph_decode_64(&p); | |
3885 | ||
3886 | rbd_dev->header.snapc = snapc; | |
3887 | ||
3888 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 3889 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
3890 | out: |
3891 | kfree(reply_buf); | |
3892 | ||
57385b51 | 3893 | return ret; |
35d489f9 AE |
3894 | } |
3895 | ||
cb75223d | 3896 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
b8b1e2db AE |
3897 | { |
3898 | size_t size; | |
3899 | void *reply_buf; | |
3900 | __le64 snap_id; | |
3901 | int ret; | |
3902 | void *p; | |
3903 | void *end; | |
b8b1e2db AE |
3904 | char *snap_name; |
3905 | ||
3906 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3907 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3908 | if (!reply_buf) | |
3909 | return ERR_PTR(-ENOMEM); | |
3910 | ||
acb1b6ca | 3911 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
b8b1e2db | 3912 | snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); |
36be9a76 | 3913 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 3914 | "rbd", "get_snapshot_name", |
4157976b | 3915 | &snap_id, sizeof (snap_id), |
07b2391f | 3916 | reply_buf, size, NULL); |
36be9a76 | 3917 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
3918 | if (ret < 0) { |
3919 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 3920 | goto out; |
f40eb349 | 3921 | } |
b8b1e2db AE |
3922 | |
3923 | p = reply_buf; | |
f40eb349 | 3924 | end = reply_buf + ret; |
e5c35534 | 3925 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 3926 | if (IS_ERR(snap_name)) |
b8b1e2db | 3927 | goto out; |
b8b1e2db | 3928 | |
f40eb349 AE |
3929 | dout(" snap_id 0x%016llx snap_name = %s\n", |
3930 | (unsigned long long)le64_to_cpu(snap_id), snap_name); | |
b8b1e2db AE |
3931 | out: |
3932 | kfree(reply_buf); | |
3933 | ||
f40eb349 | 3934 | return snap_name; |
b8b1e2db AE |
3935 | } |
3936 | ||
cb75223d | 3937 | static const char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, |
b8b1e2db AE |
3938 | u64 *snap_size, u64 *snap_features) |
3939 | { | |
e0b49868 | 3940 | u64 snap_id; |
acb1b6ca AE |
3941 | u64 size; |
3942 | u64 features; | |
cb75223d | 3943 | const char *snap_name; |
b8b1e2db AE |
3944 | int ret; |
3945 | ||
acb1b6ca | 3946 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
b8b1e2db | 3947 | snap_id = rbd_dev->header.snapc->snaps[which]; |
acb1b6ca | 3948 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
b8b1e2db | 3949 | if (ret) |
acb1b6ca AE |
3950 | goto out_err; |
3951 | ||
3952 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); | |
b8b1e2db | 3953 | if (ret) |
acb1b6ca AE |
3954 | goto out_err; |
3955 | ||
3956 | snap_name = rbd_dev_v2_snap_name(rbd_dev, which); | |
3957 | if (!IS_ERR(snap_name)) { | |
3958 | *snap_size = size; | |
3959 | *snap_features = features; | |
3960 | } | |
b8b1e2db | 3961 | |
acb1b6ca AE |
3962 | return snap_name; |
3963 | out_err: | |
3964 | return ERR_PTR(ret); | |
b8b1e2db AE |
3965 | } |
3966 | ||
cb75223d | 3967 | static const char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, |
b8b1e2db AE |
3968 | u64 *snap_size, u64 *snap_features) |
3969 | { | |
3970 | if (rbd_dev->image_format == 1) | |
3971 | return rbd_dev_v1_snap_info(rbd_dev, which, | |
3972 | snap_size, snap_features); | |
3973 | if (rbd_dev->image_format == 2) | |
3974 | return rbd_dev_v2_snap_info(rbd_dev, which, | |
3975 | snap_size, snap_features); | |
3976 | return ERR_PTR(-EINVAL); | |
3977 | } | |
3978 | ||
cc4a38bd | 3979 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev) |
117973fb AE |
3980 | { |
3981 | int ret; | |
117973fb AE |
3982 | |
3983 | down_write(&rbd_dev->header_rwsem); | |
3984 | ||
117973fb AE |
3985 | ret = rbd_dev_v2_image_size(rbd_dev); |
3986 | if (ret) | |
3987 | goto out; | |
117973fb AE |
3988 | rbd_update_mapping_size(rbd_dev); |
3989 | ||
cc4a38bd | 3990 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb AE |
3991 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
3992 | if (ret) | |
3993 | goto out; | |
3994 | ret = rbd_dev_snaps_update(rbd_dev); | |
3995 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
3996 | if (ret) | |
3997 | goto out; | |
117973fb AE |
3998 | out: |
3999 | up_write(&rbd_dev->header_rwsem); | |
4000 | ||
4001 | return ret; | |
4002 | } | |
4003 | ||
dfc5606d | 4004 | /* |
35938150 AE |
4005 | * Scan the rbd device's current snapshot list and compare it to the |
4006 | * newly-received snapshot context. Remove any existing snapshots | |
4007 | * not present in the new snapshot context. Add a new snapshot for | |
4008 | * any snaphots in the snapshot context not in the current list. | |
4009 | * And verify there are no changes to snapshots we already know | |
4010 | * about. | |
4011 | * | |
4012 | * Assumes the snapshots in the snapshot context are sorted by | |
4013 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
4014 | * are also maintained in that order.) | |
522a0cc0 AE |
4015 | * |
4016 | * Note that any error occurs while updating the snapshot list | |
4017 | * aborts the update, and the entire list is cleared. The snapshot | |
4018 | * list becomes inconsistent at that point anyway, so it might as | |
4019 | * well be empty. | |
dfc5606d | 4020 | */ |
304f6808 | 4021 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 4022 | { |
35938150 AE |
4023 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
4024 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
4025 | struct list_head *head = &rbd_dev->snaps; |
4026 | struct list_head *links = head->next; | |
4027 | u32 index = 0; | |
522a0cc0 | 4028 | int ret = 0; |
dfc5606d | 4029 | |
522a0cc0 | 4030 | dout("%s: snap count is %u\n", __func__, (unsigned int)snap_count); |
35938150 AE |
4031 | while (index < snap_count || links != head) { |
4032 | u64 snap_id; | |
4033 | struct rbd_snap *snap; | |
cb75223d | 4034 | const char *snap_name; |
cd892126 AE |
4035 | u64 snap_size = 0; |
4036 | u64 snap_features = 0; | |
dfc5606d | 4037 | |
35938150 AE |
4038 | snap_id = index < snap_count ? snapc->snaps[index] |
4039 | : CEPH_NOSNAP; | |
4040 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
4041 | : NULL; | |
aafb230e | 4042 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 4043 | |
35938150 AE |
4044 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
4045 | struct list_head *next = links->next; | |
dfc5606d | 4046 | |
6d292906 AE |
4047 | /* |
4048 | * A previously-existing snapshot is not in | |
4049 | * the new snap context. | |
4050 | * | |
522a0cc0 AE |
4051 | * If the now-missing snapshot is the one |
4052 | * the image represents, clear its existence | |
4053 | * flag so we can avoid sending any more | |
4054 | * requests to it. | |
6d292906 | 4055 | */ |
0d7dbfce | 4056 | if (rbd_dev->spec->snap_id == snap->id) |
6d292906 | 4057 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
3e83b65b | 4058 | dout("removing %ssnap id %llu\n", |
0d7dbfce AE |
4059 | rbd_dev->spec->snap_id == snap->id ? |
4060 | "mapped " : "", | |
522a0cc0 | 4061 | (unsigned long long)snap->id); |
6087b51b AE |
4062 | |
4063 | list_del(&snap->node); | |
4064 | rbd_snap_destroy(snap); | |
35938150 AE |
4065 | |
4066 | /* Done with this list entry; advance */ | |
4067 | ||
4068 | links = next; | |
dfc5606d YS |
4069 | continue; |
4070 | } | |
35938150 | 4071 | |
b8b1e2db AE |
4072 | snap_name = rbd_dev_snap_info(rbd_dev, index, |
4073 | &snap_size, &snap_features); | |
522a0cc0 AE |
4074 | if (IS_ERR(snap_name)) { |
4075 | ret = PTR_ERR(snap_name); | |
4076 | dout("failed to get snap info, error %d\n", ret); | |
4077 | goto out_err; | |
4078 | } | |
cd892126 | 4079 | |
522a0cc0 AE |
4080 | dout("entry %u: snap_id = %llu\n", (unsigned int)snap_count, |
4081 | (unsigned long long)snap_id); | |
35938150 AE |
4082 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
4083 | struct rbd_snap *new_snap; | |
4084 | ||
4085 | /* We haven't seen this snapshot before */ | |
4086 | ||
6087b51b | 4087 | new_snap = rbd_snap_create(rbd_dev, snap_name, |
cd892126 | 4088 | snap_id, snap_size, snap_features); |
9fcbb800 | 4089 | if (IS_ERR(new_snap)) { |
522a0cc0 AE |
4090 | ret = PTR_ERR(new_snap); |
4091 | dout(" failed to add dev, error %d\n", ret); | |
4092 | goto out_err; | |
9fcbb800 | 4093 | } |
35938150 AE |
4094 | |
4095 | /* New goes before existing, or at end of list */ | |
4096 | ||
9fcbb800 | 4097 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
4098 | if (snap) |
4099 | list_add_tail(&new_snap->node, &snap->node); | |
4100 | else | |
523f3258 | 4101 | list_add_tail(&new_snap->node, head); |
35938150 AE |
4102 | } else { |
4103 | /* Already have this one */ | |
4104 | ||
9fcbb800 AE |
4105 | dout(" already present\n"); |
4106 | ||
cd892126 | 4107 | rbd_assert(snap->size == snap_size); |
aafb230e | 4108 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 4109 | rbd_assert(snap->features == snap_features); |
35938150 AE |
4110 | |
4111 | /* Done with this list entry; advance */ | |
4112 | ||
4113 | links = links->next; | |
dfc5606d | 4114 | } |
35938150 AE |
4115 | |
4116 | /* Advance to the next entry in the snapshot context */ | |
4117 | ||
4118 | index++; | |
dfc5606d | 4119 | } |
9fcbb800 | 4120 | dout("%s: done\n", __func__); |
dfc5606d YS |
4121 | |
4122 | return 0; | |
522a0cc0 AE |
4123 | out_err: |
4124 | rbd_remove_all_snaps(rbd_dev); | |
4125 | ||
4126 | return ret; | |
dfc5606d YS |
4127 | } |
4128 | ||
dfc5606d YS |
4129 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4130 | { | |
dfc5606d | 4131 | struct device *dev; |
cd789ab9 | 4132 | int ret; |
dfc5606d YS |
4133 | |
4134 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4135 | |
cd789ab9 | 4136 | dev = &rbd_dev->dev; |
dfc5606d YS |
4137 | dev->bus = &rbd_bus_type; |
4138 | dev->type = &rbd_device_type; | |
4139 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4140 | dev->release = rbd_dev_device_release; |
de71a297 | 4141 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4142 | ret = device_register(dev); |
dfc5606d | 4143 | |
dfc5606d | 4144 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4145 | |
dfc5606d | 4146 | return ret; |
602adf40 YS |
4147 | } |
4148 | ||
dfc5606d YS |
4149 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4150 | { | |
4151 | device_unregister(&rbd_dev->dev); | |
4152 | } | |
4153 | ||
e2839308 | 4154 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4155 | |
4156 | /* | |
499afd5b AE |
4157 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4158 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4159 | */ |
e2839308 | 4160 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4161 | { |
e2839308 | 4162 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4163 | |
4164 | spin_lock(&rbd_dev_list_lock); | |
4165 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4166 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4167 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4168 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4169 | } |
b7f23c36 | 4170 | |
1ddbe94e | 4171 | /* |
499afd5b AE |
4172 | * Remove an rbd_dev from the global list, and record that its |
4173 | * identifier is no longer in use. | |
1ddbe94e | 4174 | */ |
e2839308 | 4175 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4176 | { |
d184f6bf | 4177 | struct list_head *tmp; |
de71a297 | 4178 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4179 | int max_id; |
4180 | ||
aafb230e | 4181 | rbd_assert(rbd_id > 0); |
499afd5b | 4182 | |
e2839308 AE |
4183 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4184 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4185 | spin_lock(&rbd_dev_list_lock); |
4186 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4187 | |
4188 | /* | |
4189 | * If the id being "put" is not the current maximum, there | |
4190 | * is nothing special we need to do. | |
4191 | */ | |
e2839308 | 4192 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4193 | spin_unlock(&rbd_dev_list_lock); |
4194 | return; | |
4195 | } | |
4196 | ||
4197 | /* | |
4198 | * We need to update the current maximum id. Search the | |
4199 | * list to find out what it is. We're more likely to find | |
4200 | * the maximum at the end, so search the list backward. | |
4201 | */ | |
4202 | max_id = 0; | |
4203 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4204 | struct rbd_device *rbd_dev; | |
4205 | ||
4206 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4207 | if (rbd_dev->dev_id > max_id) |
4208 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4209 | } |
499afd5b | 4210 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4211 | |
1ddbe94e | 4212 | /* |
e2839308 | 4213 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4214 | * which case it now accurately reflects the new maximum. |
4215 | * Be careful not to overwrite the maximum value in that | |
4216 | * case. | |
1ddbe94e | 4217 | */ |
e2839308 AE |
4218 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4219 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4220 | } |
4221 | ||
e28fff26 AE |
4222 | /* |
4223 | * Skips over white space at *buf, and updates *buf to point to the | |
4224 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4225 | * the token (string of non-white space characters) found. Note |
4226 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4227 | */ |
4228 | static inline size_t next_token(const char **buf) | |
4229 | { | |
4230 | /* | |
4231 | * These are the characters that produce nonzero for | |
4232 | * isspace() in the "C" and "POSIX" locales. | |
4233 | */ | |
4234 | const char *spaces = " \f\n\r\t\v"; | |
4235 | ||
4236 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4237 | ||
4238 | return strcspn(*buf, spaces); /* Return token length */ | |
4239 | } | |
4240 | ||
4241 | /* | |
4242 | * Finds the next token in *buf, and if the provided token buffer is | |
4243 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4244 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4245 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4246 | * |
4247 | * Returns the length of the token found (not including the '\0'). | |
4248 | * Return value will be 0 if no token is found, and it will be >= | |
4249 | * token_size if the token would not fit. | |
4250 | * | |
593a9e7b | 4251 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4252 | * found token. Note that this occurs even if the token buffer is |
4253 | * too small to hold it. | |
4254 | */ | |
4255 | static inline size_t copy_token(const char **buf, | |
4256 | char *token, | |
4257 | size_t token_size) | |
4258 | { | |
4259 | size_t len; | |
4260 | ||
4261 | len = next_token(buf); | |
4262 | if (len < token_size) { | |
4263 | memcpy(token, *buf, len); | |
4264 | *(token + len) = '\0'; | |
4265 | } | |
4266 | *buf += len; | |
4267 | ||
4268 | return len; | |
4269 | } | |
4270 | ||
ea3352f4 AE |
4271 | /* |
4272 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4273 | * enough to hold a copy of it, and copies the token into the new | |
4274 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4275 | * that a duplicate buffer is created even for a zero-length token. | |
4276 | * | |
4277 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4278 | * pointer if memory for the duplicate was not available. If | |
4279 | * the lenp argument is a non-null pointer, the length of the token | |
4280 | * (not including the '\0') is returned in *lenp. | |
4281 | * | |
4282 | * If successful, the *buf pointer will be updated to point beyond | |
4283 | * the end of the found token. | |
4284 | * | |
4285 | * Note: uses GFP_KERNEL for allocation. | |
4286 | */ | |
4287 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4288 | { | |
4289 | char *dup; | |
4290 | size_t len; | |
4291 | ||
4292 | len = next_token(buf); | |
4caf35f9 | 4293 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4294 | if (!dup) |
4295 | return NULL; | |
ea3352f4 AE |
4296 | *(dup + len) = '\0'; |
4297 | *buf += len; | |
4298 | ||
4299 | if (lenp) | |
4300 | *lenp = len; | |
4301 | ||
4302 | return dup; | |
4303 | } | |
4304 | ||
a725f65e | 4305 | /* |
859c31df AE |
4306 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4307 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4308 | * and the data written is passed here via a NUL-terminated buffer. | |
4309 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4310 | * |
859c31df AE |
4311 | * The information extracted from these options is recorded in |
4312 | * the other parameters which return dynamically-allocated | |
4313 | * structures: | |
4314 | * ceph_opts | |
4315 | * The address of a pointer that will refer to a ceph options | |
4316 | * structure. Caller must release the returned pointer using | |
4317 | * ceph_destroy_options() when it is no longer needed. | |
4318 | * rbd_opts | |
4319 | * Address of an rbd options pointer. Fully initialized by | |
4320 | * this function; caller must release with kfree(). | |
4321 | * spec | |
4322 | * Address of an rbd image specification pointer. Fully | |
4323 | * initialized by this function based on parsed options. | |
4324 | * Caller must release with rbd_spec_put(). | |
4325 | * | |
4326 | * The options passed take this form: | |
4327 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4328 | * where: | |
4329 | * <mon_addrs> | |
4330 | * A comma-separated list of one or more monitor addresses. | |
4331 | * A monitor address is an ip address, optionally followed | |
4332 | * by a port number (separated by a colon). | |
4333 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4334 | * <options> | |
4335 | * A comma-separated list of ceph and/or rbd options. | |
4336 | * <pool_name> | |
4337 | * The name of the rados pool containing the rbd image. | |
4338 | * <image_name> | |
4339 | * The name of the image in that pool to map. | |
4340 | * <snap_id> | |
4341 | * An optional snapshot id. If provided, the mapping will | |
4342 | * present data from the image at the time that snapshot was | |
4343 | * created. The image head is used if no snapshot id is | |
4344 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4345 | */ |
859c31df | 4346 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4347 | struct ceph_options **ceph_opts, |
859c31df AE |
4348 | struct rbd_options **opts, |
4349 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4350 | { |
d22f76e7 | 4351 | size_t len; |
859c31df | 4352 | char *options; |
0ddebc0c | 4353 | const char *mon_addrs; |
ecb4dc22 | 4354 | char *snap_name; |
0ddebc0c | 4355 | size_t mon_addrs_size; |
859c31df | 4356 | struct rbd_spec *spec = NULL; |
4e9afeba | 4357 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4358 | struct ceph_options *copts; |
dc79b113 | 4359 | int ret; |
e28fff26 AE |
4360 | |
4361 | /* The first four tokens are required */ | |
4362 | ||
7ef3214a | 4363 | len = next_token(&buf); |
4fb5d671 AE |
4364 | if (!len) { |
4365 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4366 | return -EINVAL; | |
4367 | } | |
0ddebc0c | 4368 | mon_addrs = buf; |
f28e565a | 4369 | mon_addrs_size = len + 1; |
7ef3214a | 4370 | buf += len; |
a725f65e | 4371 | |
dc79b113 | 4372 | ret = -EINVAL; |
f28e565a AE |
4373 | options = dup_token(&buf, NULL); |
4374 | if (!options) | |
dc79b113 | 4375 | return -ENOMEM; |
4fb5d671 AE |
4376 | if (!*options) { |
4377 | rbd_warn(NULL, "no options provided"); | |
4378 | goto out_err; | |
4379 | } | |
e28fff26 | 4380 | |
859c31df AE |
4381 | spec = rbd_spec_alloc(); |
4382 | if (!spec) | |
f28e565a | 4383 | goto out_mem; |
859c31df AE |
4384 | |
4385 | spec->pool_name = dup_token(&buf, NULL); | |
4386 | if (!spec->pool_name) | |
4387 | goto out_mem; | |
4fb5d671 AE |
4388 | if (!*spec->pool_name) { |
4389 | rbd_warn(NULL, "no pool name provided"); | |
4390 | goto out_err; | |
4391 | } | |
e28fff26 | 4392 | |
69e7a02f | 4393 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4394 | if (!spec->image_name) |
f28e565a | 4395 | goto out_mem; |
4fb5d671 AE |
4396 | if (!*spec->image_name) { |
4397 | rbd_warn(NULL, "no image name provided"); | |
4398 | goto out_err; | |
4399 | } | |
d4b125e9 | 4400 | |
f28e565a AE |
4401 | /* |
4402 | * Snapshot name is optional; default is to use "-" | |
4403 | * (indicating the head/no snapshot). | |
4404 | */ | |
3feeb894 | 4405 | len = next_token(&buf); |
820a5f3e | 4406 | if (!len) { |
3feeb894 AE |
4407 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4408 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4409 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4410 | ret = -ENAMETOOLONG; |
f28e565a | 4411 | goto out_err; |
849b4260 | 4412 | } |
ecb4dc22 AE |
4413 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4414 | if (!snap_name) | |
f28e565a | 4415 | goto out_mem; |
ecb4dc22 AE |
4416 | *(snap_name + len) = '\0'; |
4417 | spec->snap_name = snap_name; | |
e5c35534 | 4418 | |
0ddebc0c | 4419 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4420 | |
4e9afeba AE |
4421 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4422 | if (!rbd_opts) | |
4423 | goto out_mem; | |
4424 | ||
4425 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4426 | |
859c31df | 4427 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4428 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4429 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4430 | if (IS_ERR(copts)) { |
4431 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4432 | goto out_err; |
4433 | } | |
859c31df AE |
4434 | kfree(options); |
4435 | ||
4436 | *ceph_opts = copts; | |
4e9afeba | 4437 | *opts = rbd_opts; |
859c31df | 4438 | *rbd_spec = spec; |
0ddebc0c | 4439 | |
dc79b113 | 4440 | return 0; |
f28e565a | 4441 | out_mem: |
dc79b113 | 4442 | ret = -ENOMEM; |
d22f76e7 | 4443 | out_err: |
859c31df AE |
4444 | kfree(rbd_opts); |
4445 | rbd_spec_put(spec); | |
f28e565a | 4446 | kfree(options); |
d22f76e7 | 4447 | |
dc79b113 | 4448 | return ret; |
a725f65e AE |
4449 | } |
4450 | ||
589d30e0 AE |
4451 | /* |
4452 | * An rbd format 2 image has a unique identifier, distinct from the | |
4453 | * name given to it by the user. Internally, that identifier is | |
4454 | * what's used to specify the names of objects related to the image. | |
4455 | * | |
4456 | * A special "rbd id" object is used to map an rbd image name to its | |
4457 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4458 | * with the supplied name. | |
4459 | * | |
4460 | * This function will record the given rbd_dev's image_id field if | |
4461 | * it can be determined, and in that case will return 0. If any | |
4462 | * errors occur a negative errno will be returned and the rbd_dev's | |
4463 | * image_id field will be unchanged (and should be NULL). | |
4464 | */ | |
4465 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4466 | { | |
4467 | int ret; | |
4468 | size_t size; | |
4469 | char *object_name; | |
4470 | void *response; | |
c0fba368 | 4471 | char *image_id; |
2f82ee54 | 4472 | |
2c0d0a10 AE |
4473 | /* |
4474 | * When probing a parent image, the image id is already | |
4475 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4476 | * need to fetch the image id again in this case. We |
4477 | * do still need to set the image format though. | |
2c0d0a10 | 4478 | */ |
c0fba368 AE |
4479 | if (rbd_dev->spec->image_id) { |
4480 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4481 | ||
2c0d0a10 | 4482 | return 0; |
c0fba368 | 4483 | } |
2c0d0a10 | 4484 | |
589d30e0 AE |
4485 | /* |
4486 | * First, see if the format 2 image id file exists, and if | |
4487 | * so, get the image's persistent id from it. | |
4488 | */ | |
69e7a02f | 4489 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4490 | object_name = kmalloc(size, GFP_NOIO); |
4491 | if (!object_name) | |
4492 | return -ENOMEM; | |
0d7dbfce | 4493 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4494 | dout("rbd id object name is %s\n", object_name); |
4495 | ||
4496 | /* Response will be an encoded string, which includes a length */ | |
4497 | ||
4498 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4499 | response = kzalloc(size, GFP_NOIO); | |
4500 | if (!response) { | |
4501 | ret = -ENOMEM; | |
4502 | goto out; | |
4503 | } | |
4504 | ||
c0fba368 AE |
4505 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4506 | ||
36be9a76 | 4507 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4508 | "rbd", "get_id", NULL, 0, |
07b2391f | 4509 | response, RBD_IMAGE_ID_LEN_MAX, NULL); |
36be9a76 | 4510 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4511 | if (ret == -ENOENT) { |
4512 | image_id = kstrdup("", GFP_KERNEL); | |
4513 | ret = image_id ? 0 : -ENOMEM; | |
4514 | if (!ret) | |
4515 | rbd_dev->image_format = 1; | |
4516 | } else if (ret > sizeof (__le32)) { | |
4517 | void *p = response; | |
4518 | ||
4519 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4520 | NULL, GFP_NOIO); |
c0fba368 AE |
4521 | ret = IS_ERR(image_id) ? PTR_ERR(image_id) : 0; |
4522 | if (!ret) | |
4523 | rbd_dev->image_format = 2; | |
589d30e0 | 4524 | } else { |
c0fba368 AE |
4525 | ret = -EINVAL; |
4526 | } | |
4527 | ||
4528 | if (!ret) { | |
4529 | rbd_dev->spec->image_id = image_id; | |
4530 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4531 | } |
4532 | out: | |
4533 | kfree(response); | |
4534 | kfree(object_name); | |
4535 | ||
4536 | return ret; | |
4537 | } | |
4538 | ||
6fd48b3b AE |
4539 | /* Undo whatever state changes are made by v1 or v2 image probe */ |
4540 | ||
4541 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) | |
4542 | { | |
4543 | struct rbd_image_header *header; | |
4544 | ||
4545 | rbd_dev_remove_parent(rbd_dev); | |
4546 | rbd_spec_put(rbd_dev->parent_spec); | |
4547 | rbd_dev->parent_spec = NULL; | |
4548 | rbd_dev->parent_overlap = 0; | |
4549 | ||
4550 | /* Free dynamic fields from the header, then zero it out */ | |
4551 | ||
4552 | header = &rbd_dev->header; | |
812164f8 | 4553 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4554 | kfree(header->snap_sizes); |
4555 | kfree(header->snap_names); | |
4556 | kfree(header->object_prefix); | |
4557 | memset(header, 0, sizeof (*header)); | |
4558 | } | |
4559 | ||
a30b71b9 AE |
4560 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4561 | { | |
4562 | int ret; | |
a30b71b9 AE |
4563 | |
4564 | /* Populate rbd image metadata */ | |
4565 | ||
4566 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4567 | if (ret < 0) | |
4568 | goto out_err; | |
86b00e0d AE |
4569 | |
4570 | /* Version 1 images have no parent (no layering) */ | |
4571 | ||
4572 | rbd_dev->parent_spec = NULL; | |
4573 | rbd_dev->parent_overlap = 0; | |
4574 | ||
a30b71b9 AE |
4575 | dout("discovered version 1 image, header name is %s\n", |
4576 | rbd_dev->header_name); | |
4577 | ||
4578 | return 0; | |
4579 | ||
4580 | out_err: | |
4581 | kfree(rbd_dev->header_name); | |
4582 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4583 | kfree(rbd_dev->spec->image_id); |
4584 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4585 | |
4586 | return ret; | |
4587 | } | |
4588 | ||
4589 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4590 | { | |
9d475de5 | 4591 | int ret; |
a30b71b9 | 4592 | |
9d475de5 | 4593 | ret = rbd_dev_v2_image_size(rbd_dev); |
57385b51 | 4594 | if (ret) |
1e130199 AE |
4595 | goto out_err; |
4596 | ||
4597 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4598 | ||
4599 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
57385b51 | 4600 | if (ret) |
b1b5402a AE |
4601 | goto out_err; |
4602 | ||
d889140c | 4603 | /* Get the and check features for the image */ |
b1b5402a AE |
4604 | |
4605 | ret = rbd_dev_v2_features(rbd_dev); | |
57385b51 | 4606 | if (ret) |
9d475de5 | 4607 | goto out_err; |
35d489f9 | 4608 | |
86b00e0d AE |
4609 | /* If the image supports layering, get the parent info */ |
4610 | ||
4611 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4612 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
57385b51 | 4613 | if (ret) |
86b00e0d | 4614 | goto out_err; |
96882f55 AE |
4615 | |
4616 | /* | |
4617 | * Don't print a warning for parent images. We can | |
4618 | * tell this point because we won't know its pool | |
4619 | * name yet (just its pool id). | |
4620 | */ | |
4621 | if (rbd_dev->spec->pool_name) | |
4622 | rbd_warn(rbd_dev, "WARNING: kernel layering " | |
4623 | "is EXPERIMENTAL!"); | |
86b00e0d AE |
4624 | } |
4625 | ||
cc070d59 AE |
4626 | /* If the image supports fancy striping, get its parameters */ |
4627 | ||
4628 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4629 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4630 | if (ret < 0) | |
4631 | goto out_err; | |
4632 | } | |
4633 | ||
6e14b1a6 AE |
4634 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4635 | ||
4636 | rbd_dev->header.crypt_type = 0; | |
4637 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4638 | |
6e14b1a6 AE |
4639 | /* Get the snapshot context, plus the header version */ |
4640 | ||
cc4a38bd | 4641 | ret = rbd_dev_v2_snap_context(rbd_dev); |
35d489f9 AE |
4642 | if (ret) |
4643 | goto out_err; | |
6e14b1a6 | 4644 | |
a30b71b9 AE |
4645 | dout("discovered version 2 image, header name is %s\n", |
4646 | rbd_dev->header_name); | |
4647 | ||
35152979 | 4648 | return 0; |
9d475de5 | 4649 | out_err: |
86b00e0d AE |
4650 | rbd_dev->parent_overlap = 0; |
4651 | rbd_spec_put(rbd_dev->parent_spec); | |
4652 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4653 | kfree(rbd_dev->header_name); |
4654 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4655 | kfree(rbd_dev->header.object_prefix); |
4656 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4657 | |
4658 | return ret; | |
a30b71b9 AE |
4659 | } |
4660 | ||
124afba2 | 4661 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 4662 | { |
2f82ee54 | 4663 | struct rbd_device *parent = NULL; |
124afba2 AE |
4664 | struct rbd_spec *parent_spec; |
4665 | struct rbd_client *rbdc; | |
4666 | int ret; | |
4667 | ||
4668 | if (!rbd_dev->parent_spec) | |
4669 | return 0; | |
4670 | /* | |
4671 | * We need to pass a reference to the client and the parent | |
4672 | * spec when creating the parent rbd_dev. Images related by | |
4673 | * parent/child relationships always share both. | |
4674 | */ | |
4675 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4676 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4677 | ||
4678 | ret = -ENOMEM; | |
4679 | parent = rbd_dev_create(rbdc, parent_spec); | |
4680 | if (!parent) | |
4681 | goto out_err; | |
4682 | ||
4683 | ret = rbd_dev_image_probe(parent); | |
4684 | if (ret < 0) | |
4685 | goto out_err; | |
4686 | rbd_dev->parent = parent; | |
4687 | ||
4688 | return 0; | |
4689 | out_err: | |
4690 | if (parent) { | |
4691 | rbd_spec_put(rbd_dev->parent_spec); | |
4692 | kfree(rbd_dev->header_name); | |
4693 | rbd_dev_destroy(parent); | |
4694 | } else { | |
4695 | rbd_put_client(rbdc); | |
4696 | rbd_spec_put(parent_spec); | |
4697 | } | |
4698 | ||
4699 | return ret; | |
4700 | } | |
4701 | ||
200a6a8b | 4702 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 4703 | { |
83a06263 | 4704 | int ret; |
d1cf5788 AE |
4705 | |
4706 | ret = rbd_dev_mapping_set(rbd_dev); | |
83a06263 | 4707 | if (ret) |
9bb81c9b | 4708 | return ret; |
5de10f3b | 4709 | |
83a06263 AE |
4710 | /* generate unique id: find highest unique id, add one */ |
4711 | rbd_dev_id_get(rbd_dev); | |
4712 | ||
4713 | /* Fill in the device name, now that we have its id. */ | |
4714 | BUILD_BUG_ON(DEV_NAME_LEN | |
4715 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4716 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4717 | ||
4718 | /* Get our block major device number. */ | |
4719 | ||
4720 | ret = register_blkdev(0, rbd_dev->name); | |
4721 | if (ret < 0) | |
4722 | goto err_out_id; | |
4723 | rbd_dev->major = ret; | |
4724 | ||
4725 | /* Set up the blkdev mapping. */ | |
4726 | ||
4727 | ret = rbd_init_disk(rbd_dev); | |
4728 | if (ret) | |
4729 | goto err_out_blkdev; | |
4730 | ||
4731 | ret = rbd_bus_add_dev(rbd_dev); | |
4732 | if (ret) | |
4733 | goto err_out_disk; | |
4734 | ||
83a06263 AE |
4735 | /* Everything's ready. Announce the disk to the world. */ |
4736 | ||
b5156e76 | 4737 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
129b79d4 | 4738 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
4739 | add_disk(rbd_dev->disk); |
4740 | ||
4741 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4742 | (unsigned long long) rbd_dev->mapping.size); | |
4743 | ||
4744 | return ret; | |
2f82ee54 | 4745 | |
83a06263 AE |
4746 | err_out_disk: |
4747 | rbd_free_disk(rbd_dev); | |
4748 | err_out_blkdev: | |
4749 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4750 | err_out_id: | |
4751 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 4752 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
4753 | |
4754 | return ret; | |
4755 | } | |
4756 | ||
332bb12d AE |
4757 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
4758 | { | |
4759 | struct rbd_spec *spec = rbd_dev->spec; | |
4760 | size_t size; | |
4761 | ||
4762 | /* Record the header object name for this rbd image. */ | |
4763 | ||
4764 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4765 | ||
4766 | if (rbd_dev->image_format == 1) | |
4767 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
4768 | else | |
4769 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
4770 | ||
4771 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
4772 | if (!rbd_dev->header_name) | |
4773 | return -ENOMEM; | |
4774 | ||
4775 | if (rbd_dev->image_format == 1) | |
4776 | sprintf(rbd_dev->header_name, "%s%s", | |
4777 | spec->image_name, RBD_SUFFIX); | |
4778 | else | |
4779 | sprintf(rbd_dev->header_name, "%s%s", | |
4780 | RBD_HEADER_PREFIX, spec->image_id); | |
4781 | return 0; | |
4782 | } | |
4783 | ||
200a6a8b AE |
4784 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
4785 | { | |
6fd48b3b AE |
4786 | int ret; |
4787 | ||
4788 | rbd_remove_all_snaps(rbd_dev); | |
4789 | rbd_dev_unprobe(rbd_dev); | |
4790 | ret = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4791 | if (ret) | |
4792 | rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret); | |
200a6a8b | 4793 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
4794 | rbd_dev->header_name = NULL; |
4795 | rbd_dev->image_format = 0; | |
4796 | kfree(rbd_dev->spec->image_id); | |
4797 | rbd_dev->spec->image_id = NULL; | |
4798 | ||
200a6a8b AE |
4799 | rbd_dev_destroy(rbd_dev); |
4800 | } | |
4801 | ||
a30b71b9 AE |
4802 | /* |
4803 | * Probe for the existence of the header object for the given rbd | |
4804 | * device. For format 2 images this includes determining the image | |
4805 | * id. | |
4806 | */ | |
71f293e2 | 4807 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev) |
a30b71b9 AE |
4808 | { |
4809 | int ret; | |
b644de2b | 4810 | int tmp; |
a30b71b9 AE |
4811 | |
4812 | /* | |
4813 | * Get the id from the image id object. If it's not a | |
4814 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4815 | * it's a format 1 image. | |
4816 | */ | |
4817 | ret = rbd_dev_image_id(rbd_dev); | |
4818 | if (ret) | |
c0fba368 AE |
4819 | return ret; |
4820 | rbd_assert(rbd_dev->spec->image_id); | |
4821 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4822 | ||
332bb12d AE |
4823 | ret = rbd_dev_header_name(rbd_dev); |
4824 | if (ret) | |
4825 | goto err_out_format; | |
4826 | ||
b644de2b AE |
4827 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
4828 | if (ret) | |
4829 | goto out_header_name; | |
4830 | ||
c0fba368 | 4831 | if (rbd_dev->image_format == 1) |
a30b71b9 AE |
4832 | ret = rbd_dev_v1_probe(rbd_dev); |
4833 | else | |
4834 | ret = rbd_dev_v2_probe(rbd_dev); | |
5655c4d9 | 4835 | if (ret) |
b644de2b | 4836 | goto err_out_watch; |
83a06263 | 4837 | |
9bb81c9b AE |
4838 | ret = rbd_dev_snaps_update(rbd_dev); |
4839 | if (ret) | |
6fd48b3b | 4840 | goto err_out_probe; |
9bb81c9b AE |
4841 | |
4842 | ret = rbd_dev_spec_update(rbd_dev); | |
4843 | if (ret) | |
4844 | goto err_out_snaps; | |
4845 | ||
4846 | ret = rbd_dev_probe_parent(rbd_dev); | |
6fd48b3b AE |
4847 | if (!ret) |
4848 | return 0; | |
83a06263 | 4849 | |
9bb81c9b AE |
4850 | err_out_snaps: |
4851 | rbd_remove_all_snaps(rbd_dev); | |
6fd48b3b AE |
4852 | err_out_probe: |
4853 | rbd_dev_unprobe(rbd_dev); | |
b644de2b AE |
4854 | err_out_watch: |
4855 | tmp = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4856 | if (tmp) | |
4857 | rbd_warn(rbd_dev, "unable to tear down watch request\n"); | |
332bb12d AE |
4858 | out_header_name: |
4859 | kfree(rbd_dev->header_name); | |
4860 | rbd_dev->header_name = NULL; | |
4861 | err_out_format: | |
4862 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
4863 | kfree(rbd_dev->spec->image_id); |
4864 | rbd_dev->spec->image_id = NULL; | |
4865 | ||
4866 | dout("probe failed, returning %d\n", ret); | |
4867 | ||
a30b71b9 AE |
4868 | return ret; |
4869 | } | |
4870 | ||
59c2be1e YS |
4871 | static ssize_t rbd_add(struct bus_type *bus, |
4872 | const char *buf, | |
4873 | size_t count) | |
602adf40 | 4874 | { |
cb8627c7 | 4875 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4876 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4877 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4878 | struct rbd_spec *spec = NULL; |
9d3997fd | 4879 | struct rbd_client *rbdc; |
27cc2594 AE |
4880 | struct ceph_osd_client *osdc; |
4881 | int rc = -ENOMEM; | |
602adf40 YS |
4882 | |
4883 | if (!try_module_get(THIS_MODULE)) | |
4884 | return -ENODEV; | |
4885 | ||
602adf40 | 4886 | /* parse add command */ |
859c31df | 4887 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4888 | if (rc < 0) |
bd4ba655 | 4889 | goto err_out_module; |
78cea76e | 4890 | |
9d3997fd AE |
4891 | rbdc = rbd_get_client(ceph_opts); |
4892 | if (IS_ERR(rbdc)) { | |
4893 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4894 | goto err_out_args; |
9d3997fd | 4895 | } |
c53d5893 | 4896 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4897 | |
602adf40 | 4898 | /* pick the pool */ |
9d3997fd | 4899 | osdc = &rbdc->client->osdc; |
859c31df | 4900 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4901 | if (rc < 0) |
4902 | goto err_out_client; | |
c0cd10db | 4903 | spec->pool_id = (u64)rc; |
859c31df | 4904 | |
0903e875 AE |
4905 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4906 | ||
c0cd10db AE |
4907 | if (spec->pool_id > (u64)U32_MAX) { |
4908 | rbd_warn(NULL, "pool id too large (%llu > %u)\n", | |
4909 | (unsigned long long)spec->pool_id, U32_MAX); | |
0903e875 AE |
4910 | rc = -EIO; |
4911 | goto err_out_client; | |
4912 | } | |
4913 | ||
c53d5893 | 4914 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4915 | if (!rbd_dev) |
4916 | goto err_out_client; | |
c53d5893 AE |
4917 | rbdc = NULL; /* rbd_dev now owns this */ |
4918 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4919 | |
bd4ba655 | 4920 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4921 | kfree(rbd_opts); |
4922 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4923 | |
71f293e2 | 4924 | rc = rbd_dev_image_probe(rbd_dev); |
a30b71b9 | 4925 | if (rc < 0) |
c53d5893 | 4926 | goto err_out_rbd_dev; |
05fd6f6f | 4927 | |
b536f69a AE |
4928 | rc = rbd_dev_device_setup(rbd_dev); |
4929 | if (!rc) | |
4930 | return count; | |
4931 | ||
4932 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
4933 | err_out_rbd_dev: |
4934 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4935 | err_out_client: |
9d3997fd | 4936 | rbd_put_client(rbdc); |
0ddebc0c | 4937 | err_out_args: |
78cea76e AE |
4938 | if (ceph_opts) |
4939 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4940 | kfree(rbd_opts); |
859c31df | 4941 | rbd_spec_put(spec); |
bd4ba655 AE |
4942 | err_out_module: |
4943 | module_put(THIS_MODULE); | |
27cc2594 | 4944 | |
602adf40 | 4945 | dout("Error adding device %s\n", buf); |
27cc2594 | 4946 | |
c0cd10db | 4947 | return (ssize_t)rc; |
602adf40 YS |
4948 | } |
4949 | ||
de71a297 | 4950 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4951 | { |
4952 | struct list_head *tmp; | |
4953 | struct rbd_device *rbd_dev; | |
4954 | ||
e124a82f | 4955 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4956 | list_for_each(tmp, &rbd_dev_list) { |
4957 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4958 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4959 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4960 | return rbd_dev; |
e124a82f | 4961 | } |
602adf40 | 4962 | } |
e124a82f | 4963 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4964 | return NULL; |
4965 | } | |
4966 | ||
200a6a8b | 4967 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 4968 | { |
593a9e7b | 4969 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4970 | |
602adf40 | 4971 | rbd_free_disk(rbd_dev); |
200a6a8b AE |
4972 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
4973 | rbd_dev_clear_mapping(rbd_dev); | |
602adf40 | 4974 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
200a6a8b | 4975 | rbd_dev->major = 0; |
e2839308 | 4976 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 4977 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
4978 | } |
4979 | ||
05a46afd AE |
4980 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
4981 | { | |
ad945fc1 | 4982 | while (rbd_dev->parent) { |
05a46afd AE |
4983 | struct rbd_device *first = rbd_dev; |
4984 | struct rbd_device *second = first->parent; | |
4985 | struct rbd_device *third; | |
4986 | ||
4987 | /* | |
4988 | * Follow to the parent with no grandparent and | |
4989 | * remove it. | |
4990 | */ | |
4991 | while (second && (third = second->parent)) { | |
4992 | first = second; | |
4993 | second = third; | |
4994 | } | |
ad945fc1 | 4995 | rbd_assert(second); |
8ad42cd0 | 4996 | rbd_dev_image_release(second); |
ad945fc1 AE |
4997 | first->parent = NULL; |
4998 | first->parent_overlap = 0; | |
4999 | ||
5000 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5001 | rbd_spec_put(first->parent_spec); |
5002 | first->parent_spec = NULL; | |
05a46afd AE |
5003 | } |
5004 | } | |
5005 | ||
dfc5606d YS |
5006 | static ssize_t rbd_remove(struct bus_type *bus, |
5007 | const char *buf, | |
5008 | size_t count) | |
602adf40 YS |
5009 | { |
5010 | struct rbd_device *rbd_dev = NULL; | |
0d8189e1 | 5011 | int target_id; |
602adf40 | 5012 | unsigned long ul; |
0d8189e1 | 5013 | int ret; |
602adf40 | 5014 | |
0d8189e1 AE |
5015 | ret = strict_strtoul(buf, 10, &ul); |
5016 | if (ret) | |
5017 | return ret; | |
602adf40 YS |
5018 | |
5019 | /* convert to int; abort if we lost anything in the conversion */ | |
5020 | target_id = (int) ul; | |
5021 | if (target_id != ul) | |
5022 | return -EINVAL; | |
5023 | ||
5024 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
5025 | ||
5026 | rbd_dev = __rbd_get_dev(target_id); | |
5027 | if (!rbd_dev) { | |
5028 | ret = -ENOENT; | |
5029 | goto done; | |
42382b70 AE |
5030 | } |
5031 | ||
a14ea269 | 5032 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 5033 | if (rbd_dev->open_count) |
42382b70 | 5034 | ret = -EBUSY; |
b82d167b AE |
5035 | else |
5036 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 5037 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 5038 | if (ret < 0) |
42382b70 | 5039 | goto done; |
0d8189e1 | 5040 | ret = count; |
b480815a | 5041 | rbd_bus_del_dev(rbd_dev); |
8ad42cd0 | 5042 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 5043 | module_put(THIS_MODULE); |
602adf40 YS |
5044 | done: |
5045 | mutex_unlock(&ctl_mutex); | |
aafb230e | 5046 | |
602adf40 YS |
5047 | return ret; |
5048 | } | |
5049 | ||
602adf40 YS |
5050 | /* |
5051 | * create control files in sysfs | |
dfc5606d | 5052 | * /sys/bus/rbd/... |
602adf40 YS |
5053 | */ |
5054 | static int rbd_sysfs_init(void) | |
5055 | { | |
dfc5606d | 5056 | int ret; |
602adf40 | 5057 | |
fed4c143 | 5058 | ret = device_register(&rbd_root_dev); |
21079786 | 5059 | if (ret < 0) |
dfc5606d | 5060 | return ret; |
602adf40 | 5061 | |
fed4c143 AE |
5062 | ret = bus_register(&rbd_bus_type); |
5063 | if (ret < 0) | |
5064 | device_unregister(&rbd_root_dev); | |
602adf40 | 5065 | |
602adf40 YS |
5066 | return ret; |
5067 | } | |
5068 | ||
5069 | static void rbd_sysfs_cleanup(void) | |
5070 | { | |
dfc5606d | 5071 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5072 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5073 | } |
5074 | ||
cc344fa1 | 5075 | static int __init rbd_init(void) |
602adf40 YS |
5076 | { |
5077 | int rc; | |
5078 | ||
1e32d34c AE |
5079 | if (!libceph_compatible(NULL)) { |
5080 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
5081 | ||
5082 | return -EINVAL; | |
5083 | } | |
602adf40 YS |
5084 | rc = rbd_sysfs_init(); |
5085 | if (rc) | |
5086 | return rc; | |
f0f8cef5 | 5087 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
5088 | return 0; |
5089 | } | |
5090 | ||
cc344fa1 | 5091 | static void __exit rbd_exit(void) |
602adf40 YS |
5092 | { |
5093 | rbd_sysfs_cleanup(); | |
5094 | } | |
5095 | ||
5096 | module_init(rbd_init); | |
5097 | module_exit(rbd_exit); | |
5098 | ||
5099 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
5100 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
5101 | MODULE_DESCRIPTION("rados block device"); | |
5102 | ||
5103 | /* following authorship retained from original osdblk.c */ | |
5104 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5105 | ||
5106 | MODULE_LICENSE("GPL"); |