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