Commit | Line | Data |
---|---|---|
e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
602adf40 YS |
36 | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/blkdev.h> | |
42 | ||
43 | #include "rbd_types.h" | |
44 | ||
aafb230e AE |
45 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
46 | ||
593a9e7b AE |
47 | /* |
48 | * The basic unit of block I/O is a sector. It is interpreted in a | |
49 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
50 | * universally 512 bytes. These symbols are just slightly more | |
51 | * meaningful than the bare numbers they represent. | |
52 | */ | |
53 | #define SECTOR_SHIFT 9 | |
54 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
55 | ||
f0f8cef5 AE |
56 | #define RBD_DRV_NAME "rbd" |
57 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
58 | |
59 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
60 | ||
d4b125e9 AE |
61 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
62 | #define RBD_MAX_SNAP_NAME_LEN \ | |
63 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
64 | ||
35d489f9 | 65 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
66 | |
67 | #define RBD_SNAP_HEAD_NAME "-" | |
68 | ||
9682fc6d AE |
69 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
70 | ||
9e15b77d AE |
71 | /* This allows a single page to hold an image name sent by OSD */ |
72 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 73 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 74 | |
1e130199 | 75 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 76 | |
d889140c AE |
77 | /* Feature bits */ |
78 | ||
5cbf6f12 AE |
79 | #define RBD_FEATURE_LAYERING (1<<0) |
80 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
81 | #define RBD_FEATURES_ALL \ | |
82 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
83 | |
84 | /* Features supported by this (client software) implementation. */ | |
85 | ||
770eba6e | 86 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 87 | |
81a89793 AE |
88 | /* |
89 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
90 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
91 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
92 | * enough to hold all possible device names. | |
93 | */ | |
602adf40 | 94 | #define DEV_NAME_LEN 32 |
81a89793 | 95 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
96 | |
97 | /* | |
98 | * block device image metadata (in-memory version) | |
99 | */ | |
100 | struct rbd_image_header { | |
f84344f3 | 101 | /* These four fields never change for a given rbd image */ |
849b4260 | 102 | char *object_prefix; |
34b13184 | 103 | u64 features; |
602adf40 YS |
104 | __u8 obj_order; |
105 | __u8 crypt_type; | |
106 | __u8 comp_type; | |
602adf40 | 107 | |
f84344f3 AE |
108 | /* The remaining fields need to be updated occasionally */ |
109 | u64 image_size; | |
110 | struct ceph_snap_context *snapc; | |
602adf40 YS |
111 | char *snap_names; |
112 | u64 *snap_sizes; | |
59c2be1e | 113 | |
500d0c0f AE |
114 | u64 stripe_unit; |
115 | u64 stripe_count; | |
59c2be1e YS |
116 | }; |
117 | ||
0d7dbfce AE |
118 | /* |
119 | * An rbd image specification. | |
120 | * | |
121 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
122 | * identify an image. Each rbd_dev structure includes a pointer to |
123 | * an rbd_spec structure that encapsulates this identity. | |
124 | * | |
125 | * Each of the id's in an rbd_spec has an associated name. For a | |
126 | * user-mapped image, the names are supplied and the id's associated | |
127 | * with them are looked up. For a layered image, a parent image is | |
128 | * defined by the tuple, and the names are looked up. | |
129 | * | |
130 | * An rbd_dev structure contains a parent_spec pointer which is | |
131 | * non-null if the image it represents is a child in a layered | |
132 | * image. This pointer will refer to the rbd_spec structure used | |
133 | * by the parent rbd_dev for its own identity (i.e., the structure | |
134 | * is shared between the parent and child). | |
135 | * | |
136 | * Since these structures are populated once, during the discovery | |
137 | * phase of image construction, they are effectively immutable so | |
138 | * we make no effort to synchronize access to them. | |
139 | * | |
140 | * Note that code herein does not assume the image name is known (it | |
141 | * could be a null pointer). | |
0d7dbfce AE |
142 | */ |
143 | struct rbd_spec { | |
144 | u64 pool_id; | |
ecb4dc22 | 145 | const char *pool_name; |
0d7dbfce | 146 | |
ecb4dc22 AE |
147 | const char *image_id; |
148 | const char *image_name; | |
0d7dbfce AE |
149 | |
150 | u64 snap_id; | |
ecb4dc22 | 151 | const char *snap_name; |
0d7dbfce AE |
152 | |
153 | struct kref kref; | |
154 | }; | |
155 | ||
602adf40 | 156 | /* |
f0f8cef5 | 157 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
158 | */ |
159 | struct rbd_client { | |
160 | struct ceph_client *client; | |
161 | struct kref kref; | |
162 | struct list_head node; | |
163 | }; | |
164 | ||
bf0d5f50 AE |
165 | struct rbd_img_request; |
166 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
167 | ||
168 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
169 | ||
170 | struct rbd_obj_request; | |
171 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
172 | ||
9969ebc5 AE |
173 | enum obj_request_type { |
174 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
175 | }; | |
bf0d5f50 | 176 | |
926f9b3f AE |
177 | enum obj_req_flags { |
178 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 179 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
180 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
181 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
182 | }; |
183 | ||
bf0d5f50 AE |
184 | struct rbd_obj_request { |
185 | const char *object_name; | |
186 | u64 offset; /* object start byte */ | |
187 | u64 length; /* bytes from offset */ | |
926f9b3f | 188 | unsigned long flags; |
bf0d5f50 | 189 | |
c5b5ef6c AE |
190 | /* |
191 | * An object request associated with an image will have its | |
192 | * img_data flag set; a standalone object request will not. | |
193 | * | |
194 | * A standalone object request will have which == BAD_WHICH | |
195 | * and a null obj_request pointer. | |
196 | * | |
197 | * An object request initiated in support of a layered image | |
198 | * object (to check for its existence before a write) will | |
199 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
200 | * | |
201 | * Finally, an object request for rbd image data will have | |
202 | * which != BAD_WHICH, and will have a non-null img_request | |
203 | * pointer. The value of which will be in the range | |
204 | * 0..(img_request->obj_request_count-1). | |
205 | */ | |
206 | union { | |
207 | struct rbd_obj_request *obj_request; /* STAT op */ | |
208 | struct { | |
209 | struct rbd_img_request *img_request; | |
210 | u64 img_offset; | |
211 | /* links for img_request->obj_requests list */ | |
212 | struct list_head links; | |
213 | }; | |
214 | }; | |
bf0d5f50 AE |
215 | u32 which; /* posn image request list */ |
216 | ||
217 | enum obj_request_type type; | |
788e2df3 AE |
218 | union { |
219 | struct bio *bio_list; | |
220 | struct { | |
221 | struct page **pages; | |
222 | u32 page_count; | |
223 | }; | |
224 | }; | |
0eefd470 | 225 | struct page **copyup_pages; |
bf0d5f50 AE |
226 | |
227 | struct ceph_osd_request *osd_req; | |
228 | ||
229 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 230 | int result; |
bf0d5f50 AE |
231 | |
232 | rbd_obj_callback_t callback; | |
788e2df3 | 233 | struct completion completion; |
bf0d5f50 AE |
234 | |
235 | struct kref kref; | |
236 | }; | |
237 | ||
0c425248 | 238 | enum img_req_flags { |
9849e986 AE |
239 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
240 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 241 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
242 | }; |
243 | ||
bf0d5f50 | 244 | struct rbd_img_request { |
bf0d5f50 AE |
245 | struct rbd_device *rbd_dev; |
246 | u64 offset; /* starting image byte offset */ | |
247 | u64 length; /* byte count from offset */ | |
0c425248 | 248 | unsigned long flags; |
bf0d5f50 | 249 | union { |
9849e986 | 250 | u64 snap_id; /* for reads */ |
bf0d5f50 | 251 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
252 | }; |
253 | union { | |
254 | struct request *rq; /* block request */ | |
255 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 256 | }; |
3d7efd18 | 257 | struct page **copyup_pages; |
bf0d5f50 AE |
258 | spinlock_t completion_lock;/* protects next_completion */ |
259 | u32 next_completion; | |
260 | rbd_img_callback_t callback; | |
55f27e09 | 261 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 262 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
263 | |
264 | u32 obj_request_count; | |
265 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
266 | ||
267 | struct kref kref; | |
268 | }; | |
269 | ||
270 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 271 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 272 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 273 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 274 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 275 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 276 | |
dfc5606d | 277 | struct rbd_snap { |
dfc5606d | 278 | const char *name; |
3591538f | 279 | u64 size; |
dfc5606d YS |
280 | struct list_head node; |
281 | u64 id; | |
34b13184 | 282 | u64 features; |
dfc5606d YS |
283 | }; |
284 | ||
f84344f3 | 285 | struct rbd_mapping { |
99c1f08f | 286 | u64 size; |
34b13184 | 287 | u64 features; |
f84344f3 AE |
288 | bool read_only; |
289 | }; | |
290 | ||
602adf40 YS |
291 | /* |
292 | * a single device | |
293 | */ | |
294 | struct rbd_device { | |
de71a297 | 295 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
296 | |
297 | int major; /* blkdev assigned major */ | |
298 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 299 | |
a30b71b9 | 300 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
301 | struct rbd_client *rbd_client; |
302 | ||
303 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
304 | ||
b82d167b | 305 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
306 | |
307 | struct rbd_image_header header; | |
b82d167b | 308 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 309 | struct rbd_spec *spec; |
602adf40 | 310 | |
0d7dbfce | 311 | char *header_name; |
971f839a | 312 | |
0903e875 AE |
313 | struct ceph_file_layout layout; |
314 | ||
59c2be1e | 315 | struct ceph_osd_event *watch_event; |
975241af | 316 | struct rbd_obj_request *watch_request; |
59c2be1e | 317 | |
86b00e0d AE |
318 | struct rbd_spec *parent_spec; |
319 | u64 parent_overlap; | |
2f82ee54 | 320 | struct rbd_device *parent; |
86b00e0d | 321 | |
c666601a JD |
322 | /* protects updating the header */ |
323 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
324 | |
325 | struct rbd_mapping mapping; | |
602adf40 YS |
326 | |
327 | struct list_head node; | |
dfc5606d YS |
328 | |
329 | /* list of snapshots */ | |
330 | struct list_head snaps; | |
331 | ||
332 | /* sysfs related */ | |
333 | struct device dev; | |
b82d167b | 334 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
335 | }; |
336 | ||
b82d167b AE |
337 | /* |
338 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
339 | * rbd_dev->lock is used to protect access. | |
340 | * | |
341 | * Currently, only the "removing" flag (which is coupled with the | |
342 | * "open_count" field) requires atomic access. | |
343 | */ | |
6d292906 AE |
344 | enum rbd_dev_flags { |
345 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 346 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
347 | }; |
348 | ||
602adf40 | 349 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 350 | |
602adf40 | 351 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
352 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
353 | ||
432b8587 AE |
354 | static LIST_HEAD(rbd_client_list); /* clients */ |
355 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 356 | |
3d7efd18 AE |
357 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
358 | ||
304f6808 | 359 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
304f6808 | 360 | |
200a6a8b | 361 | static void rbd_dev_device_release(struct device *dev); |
6087b51b | 362 | static void rbd_snap_destroy(struct rbd_snap *snap); |
dfc5606d | 363 | |
f0f8cef5 AE |
364 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
365 | size_t count); | |
366 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
367 | size_t count); | |
71f293e2 | 368 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev); |
f0f8cef5 AE |
369 | |
370 | static struct bus_attribute rbd_bus_attrs[] = { | |
371 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
372 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
373 | __ATTR_NULL | |
374 | }; | |
375 | ||
376 | static struct bus_type rbd_bus_type = { | |
377 | .name = "rbd", | |
378 | .bus_attrs = rbd_bus_attrs, | |
379 | }; | |
380 | ||
381 | static void rbd_root_dev_release(struct device *dev) | |
382 | { | |
383 | } | |
384 | ||
385 | static struct device rbd_root_dev = { | |
386 | .init_name = "rbd", | |
387 | .release = rbd_root_dev_release, | |
388 | }; | |
389 | ||
06ecc6cb AE |
390 | static __printf(2, 3) |
391 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
392 | { | |
393 | struct va_format vaf; | |
394 | va_list args; | |
395 | ||
396 | va_start(args, fmt); | |
397 | vaf.fmt = fmt; | |
398 | vaf.va = &args; | |
399 | ||
400 | if (!rbd_dev) | |
401 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
402 | else if (rbd_dev->disk) | |
403 | printk(KERN_WARNING "%s: %s: %pV\n", | |
404 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
405 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
406 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
407 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
408 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
409 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
410 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
411 | else /* punt */ | |
412 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
413 | RBD_DRV_NAME, rbd_dev, &vaf); | |
414 | va_end(args); | |
415 | } | |
416 | ||
aafb230e AE |
417 | #ifdef RBD_DEBUG |
418 | #define rbd_assert(expr) \ | |
419 | if (unlikely(!(expr))) { \ | |
420 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
421 | "at line %d:\n\n" \ | |
422 | "\trbd_assert(%s);\n\n", \ | |
423 | __func__, __LINE__, #expr); \ | |
424 | BUG(); \ | |
425 | } | |
426 | #else /* !RBD_DEBUG */ | |
427 | # define rbd_assert(expr) ((void) 0) | |
428 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 429 | |
b454e36d | 430 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
431 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
432 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 433 | |
cc4a38bd AE |
434 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
435 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev); | |
54cac61f AE |
436 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
437 | u64 snap_id); | |
59c2be1e | 438 | |
602adf40 YS |
439 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
440 | { | |
f0f8cef5 | 441 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 442 | bool removing = false; |
602adf40 | 443 | |
f84344f3 | 444 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
445 | return -EROFS; |
446 | ||
a14ea269 | 447 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
448 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
449 | removing = true; | |
450 | else | |
451 | rbd_dev->open_count++; | |
a14ea269 | 452 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
453 | if (removing) |
454 | return -ENOENT; | |
455 | ||
42382b70 | 456 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 457 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 458 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 459 | mutex_unlock(&ctl_mutex); |
340c7a2b | 460 | |
602adf40 YS |
461 | return 0; |
462 | } | |
463 | ||
dfc5606d YS |
464 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
465 | { | |
466 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
467 | unsigned long open_count_before; |
468 | ||
a14ea269 | 469 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 470 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 471 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 472 | rbd_assert(open_count_before > 0); |
dfc5606d | 473 | |
42382b70 | 474 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 475 | put_device(&rbd_dev->dev); |
42382b70 | 476 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
477 | |
478 | return 0; | |
479 | } | |
480 | ||
602adf40 YS |
481 | static const struct block_device_operations rbd_bd_ops = { |
482 | .owner = THIS_MODULE, | |
483 | .open = rbd_open, | |
dfc5606d | 484 | .release = rbd_release, |
602adf40 YS |
485 | }; |
486 | ||
487 | /* | |
488 | * Initialize an rbd client instance. | |
43ae4701 | 489 | * We own *ceph_opts. |
602adf40 | 490 | */ |
f8c38929 | 491 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
492 | { |
493 | struct rbd_client *rbdc; | |
494 | int ret = -ENOMEM; | |
495 | ||
37206ee5 | 496 | dout("%s:\n", __func__); |
602adf40 YS |
497 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
498 | if (!rbdc) | |
499 | goto out_opt; | |
500 | ||
501 | kref_init(&rbdc->kref); | |
502 | INIT_LIST_HEAD(&rbdc->node); | |
503 | ||
bc534d86 AE |
504 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
505 | ||
43ae4701 | 506 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 507 | if (IS_ERR(rbdc->client)) |
bc534d86 | 508 | goto out_mutex; |
43ae4701 | 509 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
510 | |
511 | ret = ceph_open_session(rbdc->client); | |
512 | if (ret < 0) | |
513 | goto out_err; | |
514 | ||
432b8587 | 515 | spin_lock(&rbd_client_list_lock); |
602adf40 | 516 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 517 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 518 | |
bc534d86 | 519 | mutex_unlock(&ctl_mutex); |
37206ee5 | 520 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 521 | |
602adf40 YS |
522 | return rbdc; |
523 | ||
524 | out_err: | |
525 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
526 | out_mutex: |
527 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
528 | kfree(rbdc); |
529 | out_opt: | |
43ae4701 AE |
530 | if (ceph_opts) |
531 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
532 | dout("%s: error %d\n", __func__, ret); |
533 | ||
28f259b7 | 534 | return ERR_PTR(ret); |
602adf40 YS |
535 | } |
536 | ||
2f82ee54 AE |
537 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
538 | { | |
539 | kref_get(&rbdc->kref); | |
540 | ||
541 | return rbdc; | |
542 | } | |
543 | ||
602adf40 | 544 | /* |
1f7ba331 AE |
545 | * Find a ceph client with specific addr and configuration. If |
546 | * found, bump its reference count. | |
602adf40 | 547 | */ |
1f7ba331 | 548 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
549 | { |
550 | struct rbd_client *client_node; | |
1f7ba331 | 551 | bool found = false; |
602adf40 | 552 | |
43ae4701 | 553 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
554 | return NULL; |
555 | ||
1f7ba331 AE |
556 | spin_lock(&rbd_client_list_lock); |
557 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
558 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
559 | __rbd_get_client(client_node); |
560 | ||
1f7ba331 AE |
561 | found = true; |
562 | break; | |
563 | } | |
564 | } | |
565 | spin_unlock(&rbd_client_list_lock); | |
566 | ||
567 | return found ? client_node : NULL; | |
602adf40 YS |
568 | } |
569 | ||
59c2be1e YS |
570 | /* |
571 | * mount options | |
572 | */ | |
573 | enum { | |
59c2be1e YS |
574 | Opt_last_int, |
575 | /* int args above */ | |
576 | Opt_last_string, | |
577 | /* string args above */ | |
cc0538b6 AE |
578 | Opt_read_only, |
579 | Opt_read_write, | |
580 | /* Boolean args above */ | |
581 | Opt_last_bool, | |
59c2be1e YS |
582 | }; |
583 | ||
43ae4701 | 584 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
585 | /* int args above */ |
586 | /* string args above */ | |
be466c1c | 587 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
588 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
589 | {Opt_read_write, "read_write"}, | |
590 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
591 | /* Boolean args above */ | |
59c2be1e YS |
592 | {-1, NULL} |
593 | }; | |
594 | ||
98571b5a AE |
595 | struct rbd_options { |
596 | bool read_only; | |
597 | }; | |
598 | ||
599 | #define RBD_READ_ONLY_DEFAULT false | |
600 | ||
59c2be1e YS |
601 | static int parse_rbd_opts_token(char *c, void *private) |
602 | { | |
43ae4701 | 603 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
604 | substring_t argstr[MAX_OPT_ARGS]; |
605 | int token, intval, ret; | |
606 | ||
43ae4701 | 607 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
608 | if (token < 0) |
609 | return -EINVAL; | |
610 | ||
611 | if (token < Opt_last_int) { | |
612 | ret = match_int(&argstr[0], &intval); | |
613 | if (ret < 0) { | |
614 | pr_err("bad mount option arg (not int) " | |
615 | "at '%s'\n", c); | |
616 | return ret; | |
617 | } | |
618 | dout("got int token %d val %d\n", token, intval); | |
619 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
620 | dout("got string token %d val %s\n", token, | |
621 | argstr[0].from); | |
cc0538b6 AE |
622 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
623 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
624 | } else { |
625 | dout("got token %d\n", token); | |
626 | } | |
627 | ||
628 | switch (token) { | |
cc0538b6 AE |
629 | case Opt_read_only: |
630 | rbd_opts->read_only = true; | |
631 | break; | |
632 | case Opt_read_write: | |
633 | rbd_opts->read_only = false; | |
634 | break; | |
59c2be1e | 635 | default: |
aafb230e AE |
636 | rbd_assert(false); |
637 | break; | |
59c2be1e YS |
638 | } |
639 | return 0; | |
640 | } | |
641 | ||
602adf40 YS |
642 | /* |
643 | * Get a ceph client with specific addr and configuration, if one does | |
644 | * not exist create it. | |
645 | */ | |
9d3997fd | 646 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 647 | { |
f8c38929 | 648 | struct rbd_client *rbdc; |
59c2be1e | 649 | |
1f7ba331 | 650 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 651 | if (rbdc) /* using an existing client */ |
43ae4701 | 652 | ceph_destroy_options(ceph_opts); |
9d3997fd | 653 | else |
f8c38929 | 654 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 655 | |
9d3997fd | 656 | return rbdc; |
602adf40 YS |
657 | } |
658 | ||
659 | /* | |
660 | * Destroy ceph client | |
d23a4b3f | 661 | * |
432b8587 | 662 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
663 | */ |
664 | static void rbd_client_release(struct kref *kref) | |
665 | { | |
666 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
667 | ||
37206ee5 | 668 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 669 | spin_lock(&rbd_client_list_lock); |
602adf40 | 670 | list_del(&rbdc->node); |
cd9d9f5d | 671 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
672 | |
673 | ceph_destroy_client(rbdc->client); | |
674 | kfree(rbdc); | |
675 | } | |
676 | ||
677 | /* | |
678 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
679 | * it. | |
680 | */ | |
9d3997fd | 681 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 682 | { |
c53d5893 AE |
683 | if (rbdc) |
684 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
685 | } |
686 | ||
a30b71b9 AE |
687 | static bool rbd_image_format_valid(u32 image_format) |
688 | { | |
689 | return image_format == 1 || image_format == 2; | |
690 | } | |
691 | ||
8e94af8e AE |
692 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
693 | { | |
103a150f AE |
694 | size_t size; |
695 | u32 snap_count; | |
696 | ||
697 | /* The header has to start with the magic rbd header text */ | |
698 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
699 | return false; | |
700 | ||
db2388b6 AE |
701 | /* The bio layer requires at least sector-sized I/O */ |
702 | ||
703 | if (ondisk->options.order < SECTOR_SHIFT) | |
704 | return false; | |
705 | ||
706 | /* If we use u64 in a few spots we may be able to loosen this */ | |
707 | ||
708 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
709 | return false; | |
710 | ||
103a150f AE |
711 | /* |
712 | * The size of a snapshot header has to fit in a size_t, and | |
713 | * that limits the number of snapshots. | |
714 | */ | |
715 | snap_count = le32_to_cpu(ondisk->snap_count); | |
716 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
717 | if (snap_count > size / sizeof (__le64)) | |
718 | return false; | |
719 | ||
720 | /* | |
721 | * Not only that, but the size of the entire the snapshot | |
722 | * header must also be representable in a size_t. | |
723 | */ | |
724 | size -= snap_count * sizeof (__le64); | |
725 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
726 | return false; | |
727 | ||
728 | return true; | |
8e94af8e AE |
729 | } |
730 | ||
602adf40 YS |
731 | /* |
732 | * Create a new header structure, translate header format from the on-disk | |
733 | * header. | |
734 | */ | |
735 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 736 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 737 | { |
ccece235 | 738 | u32 snap_count; |
58c17b0e | 739 | size_t len; |
d2bb24e5 | 740 | size_t size; |
621901d6 | 741 | u32 i; |
602adf40 | 742 | |
6a52325f AE |
743 | memset(header, 0, sizeof (*header)); |
744 | ||
103a150f AE |
745 | snap_count = le32_to_cpu(ondisk->snap_count); |
746 | ||
58c17b0e AE |
747 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
748 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 749 | if (!header->object_prefix) |
602adf40 | 750 | return -ENOMEM; |
58c17b0e AE |
751 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
752 | header->object_prefix[len] = '\0'; | |
00f1f36f | 753 | |
602adf40 | 754 | if (snap_count) { |
f785cc1d AE |
755 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
756 | ||
621901d6 AE |
757 | /* Save a copy of the snapshot names */ |
758 | ||
f785cc1d AE |
759 | if (snap_names_len > (u64) SIZE_MAX) |
760 | return -EIO; | |
761 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 762 | if (!header->snap_names) |
6a52325f | 763 | goto out_err; |
f785cc1d AE |
764 | /* |
765 | * Note that rbd_dev_v1_header_read() guarantees | |
766 | * the ondisk buffer we're working with has | |
767 | * snap_names_len bytes beyond the end of the | |
768 | * snapshot id array, this memcpy() is safe. | |
769 | */ | |
770 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
771 | snap_names_len); | |
6a52325f | 772 | |
621901d6 AE |
773 | /* Record each snapshot's size */ |
774 | ||
d2bb24e5 AE |
775 | size = snap_count * sizeof (*header->snap_sizes); |
776 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 777 | if (!header->snap_sizes) |
6a52325f | 778 | goto out_err; |
621901d6 AE |
779 | for (i = 0; i < snap_count; i++) |
780 | header->snap_sizes[i] = | |
781 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 YS |
782 | } else { |
783 | header->snap_names = NULL; | |
784 | header->snap_sizes = NULL; | |
785 | } | |
849b4260 | 786 | |
34b13184 | 787 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
788 | header->obj_order = ondisk->options.order; |
789 | header->crypt_type = ondisk->options.crypt_type; | |
790 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 791 | |
621901d6 AE |
792 | /* Allocate and fill in the snapshot context */ |
793 | ||
f84344f3 | 794 | header->image_size = le64_to_cpu(ondisk->image_size); |
468521c1 | 795 | |
812164f8 | 796 | header->snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
6a52325f AE |
797 | if (!header->snapc) |
798 | goto out_err; | |
505cbb9b | 799 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
621901d6 | 800 | for (i = 0; i < snap_count; i++) |
468521c1 | 801 | header->snapc->snaps[i] = le64_to_cpu(ondisk->snaps[i].id); |
602adf40 YS |
802 | |
803 | return 0; | |
804 | ||
6a52325f | 805 | out_err: |
849b4260 | 806 | kfree(header->snap_sizes); |
ccece235 | 807 | header->snap_sizes = NULL; |
602adf40 | 808 | kfree(header->snap_names); |
ccece235 | 809 | header->snap_names = NULL; |
6a52325f AE |
810 | kfree(header->object_prefix); |
811 | header->object_prefix = NULL; | |
ccece235 | 812 | |
00f1f36f | 813 | return -ENOMEM; |
602adf40 YS |
814 | } |
815 | ||
9682fc6d AE |
816 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
817 | { | |
818 | const char *snap_name; | |
819 | ||
820 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
821 | ||
822 | /* Skip over names until we find the one we are looking for */ | |
823 | ||
824 | snap_name = rbd_dev->header.snap_names; | |
825 | while (which--) | |
826 | snap_name += strlen(snap_name) + 1; | |
827 | ||
828 | return kstrdup(snap_name, GFP_KERNEL); | |
829 | } | |
830 | ||
831 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) | |
832 | { | |
833 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
834 | u32 which; | |
835 | ||
836 | for (which = 0; which < snapc->num_snaps; which++) | |
837 | if (snapc->snaps[which] == snap_id) | |
838 | return which; | |
839 | ||
840 | return BAD_SNAP_INDEX; | |
841 | } | |
842 | ||
54cac61f | 843 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
9e15b77d | 844 | { |
54cac61f | 845 | u32 which; |
9e15b77d | 846 | |
54cac61f AE |
847 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
848 | if (which == BAD_SNAP_INDEX) | |
849 | return NULL; | |
850 | ||
851 | return _rbd_dev_v1_snap_name(rbd_dev, which); | |
852 | } | |
853 | ||
854 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
855 | { | |
9e15b77d AE |
856 | if (snap_id == CEPH_NOSNAP) |
857 | return RBD_SNAP_HEAD_NAME; | |
858 | ||
54cac61f AE |
859 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
860 | if (rbd_dev->image_format == 1) | |
861 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 862 | |
54cac61f | 863 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
864 | } |
865 | ||
8b0241f8 AE |
866 | static struct rbd_snap *snap_by_name(struct rbd_device *rbd_dev, |
867 | const char *snap_name) | |
602adf40 | 868 | { |
e86924a8 | 869 | struct rbd_snap *snap; |
602adf40 | 870 | |
8b0241f8 AE |
871 | list_for_each_entry(snap, &rbd_dev->snaps, node) |
872 | if (!strcmp(snap_name, snap->name)) | |
873 | return snap; | |
e86924a8 | 874 | |
8b0241f8 | 875 | return NULL; |
602adf40 YS |
876 | } |
877 | ||
d1cf5788 | 878 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
602adf40 | 879 | { |
0d7dbfce | 880 | if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
cc9d734c | 881 | sizeof (RBD_SNAP_HEAD_NAME))) { |
99c1f08f | 882 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
34b13184 | 883 | rbd_dev->mapping.features = rbd_dev->header.features; |
602adf40 | 884 | } else { |
8b0241f8 AE |
885 | struct rbd_snap *snap; |
886 | ||
887 | snap = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); | |
888 | if (!snap) | |
889 | return -ENOENT; | |
8b0241f8 AE |
890 | rbd_dev->mapping.size = snap->size; |
891 | rbd_dev->mapping.features = snap->features; | |
f84344f3 | 892 | rbd_dev->mapping.read_only = true; |
602adf40 | 893 | } |
6d292906 | 894 | |
8b0241f8 | 895 | return 0; |
602adf40 YS |
896 | } |
897 | ||
d1cf5788 AE |
898 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
899 | { | |
900 | rbd_dev->mapping.size = 0; | |
901 | rbd_dev->mapping.features = 0; | |
902 | rbd_dev->mapping.read_only = true; | |
903 | } | |
904 | ||
200a6a8b AE |
905 | static void rbd_dev_clear_mapping(struct rbd_device *rbd_dev) |
906 | { | |
907 | rbd_dev->mapping.size = 0; | |
908 | rbd_dev->mapping.features = 0; | |
909 | rbd_dev->mapping.read_only = true; | |
910 | } | |
911 | ||
98571b5a | 912 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 913 | { |
65ccfe21 AE |
914 | char *name; |
915 | u64 segment; | |
916 | int ret; | |
602adf40 | 917 | |
2fd82b9e | 918 | name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
65ccfe21 AE |
919 | if (!name) |
920 | return NULL; | |
921 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 922 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 923 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 924 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
925 | pr_err("error formatting segment name for #%llu (%d)\n", |
926 | segment, ret); | |
927 | kfree(name); | |
928 | name = NULL; | |
929 | } | |
602adf40 | 930 | |
65ccfe21 AE |
931 | return name; |
932 | } | |
602adf40 | 933 | |
65ccfe21 AE |
934 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
935 | { | |
936 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 937 | |
65ccfe21 AE |
938 | return offset & (segment_size - 1); |
939 | } | |
940 | ||
941 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
942 | u64 offset, u64 length) | |
943 | { | |
944 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
945 | ||
946 | offset &= segment_size - 1; | |
947 | ||
aafb230e | 948 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
949 | if (offset + length > segment_size) |
950 | length = segment_size - offset; | |
951 | ||
952 | return length; | |
602adf40 YS |
953 | } |
954 | ||
029bcbd8 JD |
955 | /* |
956 | * returns the size of an object in the image | |
957 | */ | |
958 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
959 | { | |
960 | return 1 << header->obj_order; | |
961 | } | |
962 | ||
602adf40 YS |
963 | /* |
964 | * bio helpers | |
965 | */ | |
966 | ||
967 | static void bio_chain_put(struct bio *chain) | |
968 | { | |
969 | struct bio *tmp; | |
970 | ||
971 | while (chain) { | |
972 | tmp = chain; | |
973 | chain = chain->bi_next; | |
974 | bio_put(tmp); | |
975 | } | |
976 | } | |
977 | ||
978 | /* | |
979 | * zeros a bio chain, starting at specific offset | |
980 | */ | |
981 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
982 | { | |
983 | struct bio_vec *bv; | |
984 | unsigned long flags; | |
985 | void *buf; | |
986 | int i; | |
987 | int pos = 0; | |
988 | ||
989 | while (chain) { | |
990 | bio_for_each_segment(bv, chain, i) { | |
991 | if (pos + bv->bv_len > start_ofs) { | |
992 | int remainder = max(start_ofs - pos, 0); | |
993 | buf = bvec_kmap_irq(bv, &flags); | |
994 | memset(buf + remainder, 0, | |
995 | bv->bv_len - remainder); | |
85b5aaa6 | 996 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
997 | } |
998 | pos += bv->bv_len; | |
999 | } | |
1000 | ||
1001 | chain = chain->bi_next; | |
1002 | } | |
1003 | } | |
1004 | ||
b9434c5b AE |
1005 | /* |
1006 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1007 | * starting at the given byte offset from the start of the array and | |
1008 | * continuing up to the given end offset. The pages array is | |
1009 | * assumed to be big enough to hold all bytes up to the end. | |
1010 | */ | |
1011 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1012 | { | |
1013 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1014 | ||
1015 | rbd_assert(end > offset); | |
1016 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1017 | while (offset < end) { | |
1018 | size_t page_offset; | |
1019 | size_t length; | |
1020 | unsigned long flags; | |
1021 | void *kaddr; | |
1022 | ||
1023 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
1024 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
1025 | local_irq_save(flags); | |
1026 | kaddr = kmap_atomic(*page); | |
1027 | memset(kaddr + page_offset, 0, length); | |
1028 | kunmap_atomic(kaddr); | |
1029 | local_irq_restore(flags); | |
1030 | ||
1031 | offset += length; | |
1032 | page++; | |
1033 | } | |
1034 | } | |
1035 | ||
602adf40 | 1036 | /* |
f7760dad AE |
1037 | * Clone a portion of a bio, starting at the given byte offset |
1038 | * and continuing for the number of bytes indicated. | |
602adf40 | 1039 | */ |
f7760dad AE |
1040 | static struct bio *bio_clone_range(struct bio *bio_src, |
1041 | unsigned int offset, | |
1042 | unsigned int len, | |
1043 | gfp_t gfpmask) | |
602adf40 | 1044 | { |
f7760dad AE |
1045 | struct bio_vec *bv; |
1046 | unsigned int resid; | |
1047 | unsigned short idx; | |
1048 | unsigned int voff; | |
1049 | unsigned short end_idx; | |
1050 | unsigned short vcnt; | |
1051 | struct bio *bio; | |
1052 | ||
1053 | /* Handle the easy case for the caller */ | |
1054 | ||
1055 | if (!offset && len == bio_src->bi_size) | |
1056 | return bio_clone(bio_src, gfpmask); | |
1057 | ||
1058 | if (WARN_ON_ONCE(!len)) | |
1059 | return NULL; | |
1060 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1061 | return NULL; | |
1062 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1063 | return NULL; | |
1064 | ||
1065 | /* Find first affected segment... */ | |
1066 | ||
1067 | resid = offset; | |
1068 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1069 | if (resid < bv->bv_len) | |
1070 | break; | |
1071 | resid -= bv->bv_len; | |
602adf40 | 1072 | } |
f7760dad | 1073 | voff = resid; |
602adf40 | 1074 | |
f7760dad | 1075 | /* ...and the last affected segment */ |
602adf40 | 1076 | |
f7760dad AE |
1077 | resid += len; |
1078 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1079 | if (resid <= bv->bv_len) | |
1080 | break; | |
1081 | resid -= bv->bv_len; | |
1082 | } | |
1083 | vcnt = end_idx - idx + 1; | |
1084 | ||
1085 | /* Build the clone */ | |
1086 | ||
1087 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1088 | if (!bio) | |
1089 | return NULL; /* ENOMEM */ | |
602adf40 | 1090 | |
f7760dad AE |
1091 | bio->bi_bdev = bio_src->bi_bdev; |
1092 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1093 | bio->bi_rw = bio_src->bi_rw; | |
1094 | bio->bi_flags |= 1 << BIO_CLONED; | |
1095 | ||
1096 | /* | |
1097 | * Copy over our part of the bio_vec, then update the first | |
1098 | * and last (or only) entries. | |
1099 | */ | |
1100 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1101 | vcnt * sizeof (struct bio_vec)); | |
1102 | bio->bi_io_vec[0].bv_offset += voff; | |
1103 | if (vcnt > 1) { | |
1104 | bio->bi_io_vec[0].bv_len -= voff; | |
1105 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1106 | } else { | |
1107 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1108 | } |
1109 | ||
f7760dad AE |
1110 | bio->bi_vcnt = vcnt; |
1111 | bio->bi_size = len; | |
1112 | bio->bi_idx = 0; | |
1113 | ||
1114 | return bio; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Clone a portion of a bio chain, starting at the given byte offset | |
1119 | * into the first bio in the source chain and continuing for the | |
1120 | * number of bytes indicated. The result is another bio chain of | |
1121 | * exactly the given length, or a null pointer on error. | |
1122 | * | |
1123 | * The bio_src and offset parameters are both in-out. On entry they | |
1124 | * refer to the first source bio and the offset into that bio where | |
1125 | * the start of data to be cloned is located. | |
1126 | * | |
1127 | * On return, bio_src is updated to refer to the bio in the source | |
1128 | * chain that contains first un-cloned byte, and *offset will | |
1129 | * contain the offset of that byte within that bio. | |
1130 | */ | |
1131 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1132 | unsigned int *offset, | |
1133 | unsigned int len, | |
1134 | gfp_t gfpmask) | |
1135 | { | |
1136 | struct bio *bi = *bio_src; | |
1137 | unsigned int off = *offset; | |
1138 | struct bio *chain = NULL; | |
1139 | struct bio **end; | |
1140 | ||
1141 | /* Build up a chain of clone bios up to the limit */ | |
1142 | ||
1143 | if (!bi || off >= bi->bi_size || !len) | |
1144 | return NULL; /* Nothing to clone */ | |
602adf40 | 1145 | |
f7760dad AE |
1146 | end = &chain; |
1147 | while (len) { | |
1148 | unsigned int bi_size; | |
1149 | struct bio *bio; | |
1150 | ||
f5400b7a AE |
1151 | if (!bi) { |
1152 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1153 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1154 | } |
f7760dad AE |
1155 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1156 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1157 | if (!bio) | |
1158 | goto out_err; /* ENOMEM */ | |
1159 | ||
1160 | *end = bio; | |
1161 | end = &bio->bi_next; | |
602adf40 | 1162 | |
f7760dad AE |
1163 | off += bi_size; |
1164 | if (off == bi->bi_size) { | |
1165 | bi = bi->bi_next; | |
1166 | off = 0; | |
1167 | } | |
1168 | len -= bi_size; | |
1169 | } | |
1170 | *bio_src = bi; | |
1171 | *offset = off; | |
1172 | ||
1173 | return chain; | |
1174 | out_err: | |
1175 | bio_chain_put(chain); | |
602adf40 | 1176 | |
602adf40 YS |
1177 | return NULL; |
1178 | } | |
1179 | ||
926f9b3f AE |
1180 | /* |
1181 | * The default/initial value for all object request flags is 0. For | |
1182 | * each flag, once its value is set to 1 it is never reset to 0 | |
1183 | * again. | |
1184 | */ | |
57acbaa7 | 1185 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1186 | { |
57acbaa7 | 1187 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1188 | struct rbd_device *rbd_dev; |
1189 | ||
57acbaa7 AE |
1190 | rbd_dev = obj_request->img_request->rbd_dev; |
1191 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1192 | obj_request); |
1193 | } | |
1194 | } | |
1195 | ||
57acbaa7 | 1196 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1197 | { |
1198 | smp_mb(); | |
57acbaa7 | 1199 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1200 | } |
1201 | ||
57acbaa7 | 1202 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1203 | { |
57acbaa7 AE |
1204 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1205 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1206 | |
57acbaa7 AE |
1207 | if (obj_request_img_data_test(obj_request)) |
1208 | rbd_dev = obj_request->img_request->rbd_dev; | |
1209 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1210 | obj_request); |
1211 | } | |
1212 | } | |
1213 | ||
57acbaa7 | 1214 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1215 | { |
1216 | smp_mb(); | |
57acbaa7 | 1217 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1218 | } |
1219 | ||
5679c59f AE |
1220 | /* |
1221 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1222 | * flag. The latter is set based on the "exists" value provided. | |
1223 | * | |
1224 | * Note that for our purposes once an object exists it never goes | |
1225 | * away again. It's possible that the response from two existence | |
1226 | * checks are separated by the creation of the target object, and | |
1227 | * the first ("doesn't exist") response arrives *after* the second | |
1228 | * ("does exist"). In that case we ignore the second one. | |
1229 | */ | |
1230 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1231 | bool exists) | |
1232 | { | |
1233 | if (exists) | |
1234 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1235 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1236 | smp_mb(); | |
1237 | } | |
1238 | ||
1239 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1240 | { | |
1241 | smp_mb(); | |
1242 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1243 | } | |
1244 | ||
1245 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1246 | { | |
1247 | smp_mb(); | |
1248 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1249 | } | |
1250 | ||
bf0d5f50 AE |
1251 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1252 | { | |
37206ee5 AE |
1253 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1254 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1255 | kref_get(&obj_request->kref); |
1256 | } | |
1257 | ||
1258 | static void rbd_obj_request_destroy(struct kref *kref); | |
1259 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1260 | { | |
1261 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1262 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1263 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1264 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1265 | } | |
1266 | ||
1267 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1268 | { | |
37206ee5 AE |
1269 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1270 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1271 | kref_get(&img_request->kref); |
1272 | } | |
1273 | ||
1274 | static void rbd_img_request_destroy(struct kref *kref); | |
1275 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1276 | { | |
1277 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1278 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1279 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1280 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1281 | } | |
1282 | ||
1283 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1284 | struct rbd_obj_request *obj_request) | |
1285 | { | |
25dcf954 AE |
1286 | rbd_assert(obj_request->img_request == NULL); |
1287 | ||
b155e86c | 1288 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1289 | obj_request->img_request = img_request; |
25dcf954 | 1290 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1291 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1292 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1293 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1294 | img_request->obj_request_count++; |
1295 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1296 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1297 | obj_request->which); | |
bf0d5f50 AE |
1298 | } |
1299 | ||
1300 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1301 | struct rbd_obj_request *obj_request) | |
1302 | { | |
1303 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1304 | |
37206ee5 AE |
1305 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1306 | obj_request->which); | |
bf0d5f50 | 1307 | list_del(&obj_request->links); |
25dcf954 AE |
1308 | rbd_assert(img_request->obj_request_count > 0); |
1309 | img_request->obj_request_count--; | |
1310 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1311 | obj_request->which = BAD_WHICH; | |
6365d33a | 1312 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1313 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1314 | obj_request->img_request = NULL; |
25dcf954 | 1315 | obj_request->callback = NULL; |
bf0d5f50 AE |
1316 | rbd_obj_request_put(obj_request); |
1317 | } | |
1318 | ||
1319 | static bool obj_request_type_valid(enum obj_request_type type) | |
1320 | { | |
1321 | switch (type) { | |
9969ebc5 | 1322 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1323 | case OBJ_REQUEST_BIO: |
788e2df3 | 1324 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1325 | return true; |
1326 | default: | |
1327 | return false; | |
1328 | } | |
1329 | } | |
1330 | ||
bf0d5f50 AE |
1331 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1332 | struct rbd_obj_request *obj_request) | |
1333 | { | |
37206ee5 AE |
1334 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1335 | ||
bf0d5f50 AE |
1336 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1337 | } | |
1338 | ||
1339 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1340 | { | |
55f27e09 | 1341 | |
37206ee5 | 1342 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1343 | |
1344 | /* | |
1345 | * If no error occurred, compute the aggregate transfer | |
1346 | * count for the image request. We could instead use | |
1347 | * atomic64_cmpxchg() to update it as each object request | |
1348 | * completes; not clear which way is better off hand. | |
1349 | */ | |
1350 | if (!img_request->result) { | |
1351 | struct rbd_obj_request *obj_request; | |
1352 | u64 xferred = 0; | |
1353 | ||
1354 | for_each_obj_request(img_request, obj_request) | |
1355 | xferred += obj_request->xferred; | |
1356 | img_request->xferred = xferred; | |
1357 | } | |
1358 | ||
bf0d5f50 AE |
1359 | if (img_request->callback) |
1360 | img_request->callback(img_request); | |
1361 | else | |
1362 | rbd_img_request_put(img_request); | |
1363 | } | |
1364 | ||
788e2df3 AE |
1365 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1366 | ||
1367 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1368 | { | |
37206ee5 AE |
1369 | dout("%s: obj %p\n", __func__, obj_request); |
1370 | ||
788e2df3 AE |
1371 | return wait_for_completion_interruptible(&obj_request->completion); |
1372 | } | |
1373 | ||
0c425248 AE |
1374 | /* |
1375 | * The default/initial value for all image request flags is 0. Each | |
1376 | * is conditionally set to 1 at image request initialization time | |
1377 | * and currently never change thereafter. | |
1378 | */ | |
1379 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1380 | { | |
1381 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1382 | smp_mb(); | |
1383 | } | |
1384 | ||
1385 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1386 | { | |
1387 | smp_mb(); | |
1388 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1389 | } | |
1390 | ||
9849e986 AE |
1391 | static void img_request_child_set(struct rbd_img_request *img_request) |
1392 | { | |
1393 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1394 | smp_mb(); | |
1395 | } | |
1396 | ||
1397 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1398 | { | |
1399 | smp_mb(); | |
1400 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1401 | } | |
1402 | ||
d0b2e944 AE |
1403 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1404 | { | |
1405 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1406 | smp_mb(); | |
1407 | } | |
1408 | ||
1409 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1410 | { | |
1411 | smp_mb(); | |
1412 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1413 | } | |
1414 | ||
6e2a4505 AE |
1415 | static void |
1416 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1417 | { | |
b9434c5b AE |
1418 | u64 xferred = obj_request->xferred; |
1419 | u64 length = obj_request->length; | |
1420 | ||
6e2a4505 AE |
1421 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1422 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1423 | xferred, length); |
6e2a4505 AE |
1424 | /* |
1425 | * ENOENT means a hole in the image. We zero-fill the | |
1426 | * entire length of the request. A short read also implies | |
1427 | * zero-fill to the end of the request. Either way we | |
1428 | * update the xferred count to indicate the whole request | |
1429 | * was satisfied. | |
1430 | */ | |
b9434c5b | 1431 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1432 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1433 | if (obj_request->type == OBJ_REQUEST_BIO) |
1434 | zero_bio_chain(obj_request->bio_list, 0); | |
1435 | else | |
1436 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1437 | obj_request->result = 0; |
b9434c5b AE |
1438 | obj_request->xferred = length; |
1439 | } else if (xferred < length && !obj_request->result) { | |
1440 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1441 | zero_bio_chain(obj_request->bio_list, xferred); | |
1442 | else | |
1443 | zero_pages(obj_request->pages, xferred, length); | |
1444 | obj_request->xferred = length; | |
6e2a4505 AE |
1445 | } |
1446 | obj_request_done_set(obj_request); | |
1447 | } | |
1448 | ||
bf0d5f50 AE |
1449 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1450 | { | |
37206ee5 AE |
1451 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1452 | obj_request->callback); | |
bf0d5f50 AE |
1453 | if (obj_request->callback) |
1454 | obj_request->callback(obj_request); | |
788e2df3 AE |
1455 | else |
1456 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1457 | } |
1458 | ||
c47f9371 | 1459 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1460 | { |
1461 | dout("%s: obj %p\n", __func__, obj_request); | |
1462 | obj_request_done_set(obj_request); | |
1463 | } | |
1464 | ||
c47f9371 | 1465 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1466 | { |
57acbaa7 | 1467 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1468 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1469 | bool layered = false; |
1470 | ||
1471 | if (obj_request_img_data_test(obj_request)) { | |
1472 | img_request = obj_request->img_request; | |
1473 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1474 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1475 | } |
8b3e1a56 AE |
1476 | |
1477 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1478 | obj_request, img_request, obj_request->result, | |
1479 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1480 | if (layered && obj_request->result == -ENOENT && |
1481 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1482 | rbd_img_parent_read(obj_request); |
1483 | else if (img_request) | |
6e2a4505 AE |
1484 | rbd_img_obj_request_read_callback(obj_request); |
1485 | else | |
1486 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1487 | } |
1488 | ||
c47f9371 | 1489 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1490 | { |
1b83bef2 SW |
1491 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1492 | obj_request->result, obj_request->length); | |
1493 | /* | |
8b3e1a56 AE |
1494 | * There is no such thing as a successful short write. Set |
1495 | * it to our originally-requested length. | |
1b83bef2 SW |
1496 | */ |
1497 | obj_request->xferred = obj_request->length; | |
07741308 | 1498 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1499 | } |
1500 | ||
fbfab539 AE |
1501 | /* |
1502 | * For a simple stat call there's nothing to do. We'll do more if | |
1503 | * this is part of a write sequence for a layered image. | |
1504 | */ | |
c47f9371 | 1505 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1506 | { |
37206ee5 | 1507 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1508 | obj_request_done_set(obj_request); |
1509 | } | |
1510 | ||
bf0d5f50 AE |
1511 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1512 | struct ceph_msg *msg) | |
1513 | { | |
1514 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1515 | u16 opcode; |
1516 | ||
37206ee5 | 1517 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1518 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1519 | if (obj_request_img_data_test(obj_request)) { |
1520 | rbd_assert(obj_request->img_request); | |
1521 | rbd_assert(obj_request->which != BAD_WHICH); | |
1522 | } else { | |
1523 | rbd_assert(obj_request->which == BAD_WHICH); | |
1524 | } | |
bf0d5f50 | 1525 | |
1b83bef2 SW |
1526 | if (osd_req->r_result < 0) |
1527 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1528 | |
0eefd470 | 1529 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1530 | |
c47f9371 AE |
1531 | /* |
1532 | * We support a 64-bit length, but ultimately it has to be | |
1533 | * passed to blk_end_request(), which takes an unsigned int. | |
1534 | */ | |
1b83bef2 | 1535 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1536 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1537 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1538 | switch (opcode) { |
1539 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1540 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1541 | break; |
1542 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1543 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1544 | break; |
fbfab539 | 1545 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1546 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1547 | break; |
36be9a76 | 1548 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1549 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1550 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1551 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1552 | break; |
bf0d5f50 AE |
1553 | default: |
1554 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1555 | obj_request->object_name, (unsigned short) opcode); | |
1556 | break; | |
1557 | } | |
1558 | ||
07741308 | 1559 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1560 | rbd_obj_request_complete(obj_request); |
1561 | } | |
1562 | ||
9d4df01f | 1563 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1564 | { |
1565 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1566 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1567 | u64 snap_id; |
430c28c3 | 1568 | |
8c042b0d | 1569 | rbd_assert(osd_req != NULL); |
430c28c3 | 1570 | |
9d4df01f | 1571 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1572 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1573 | NULL, snap_id, NULL); |
1574 | } | |
1575 | ||
1576 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1577 | { | |
1578 | struct rbd_img_request *img_request = obj_request->img_request; | |
1579 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1580 | struct ceph_snap_context *snapc; | |
1581 | struct timespec mtime = CURRENT_TIME; | |
1582 | ||
1583 | rbd_assert(osd_req != NULL); | |
1584 | ||
1585 | snapc = img_request ? img_request->snapc : NULL; | |
1586 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1587 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1588 | } |
1589 | ||
bf0d5f50 AE |
1590 | static struct ceph_osd_request *rbd_osd_req_create( |
1591 | struct rbd_device *rbd_dev, | |
1592 | bool write_request, | |
430c28c3 | 1593 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1594 | { |
bf0d5f50 AE |
1595 | struct ceph_snap_context *snapc = NULL; |
1596 | struct ceph_osd_client *osdc; | |
1597 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1598 | |
6365d33a AE |
1599 | if (obj_request_img_data_test(obj_request)) { |
1600 | struct rbd_img_request *img_request = obj_request->img_request; | |
1601 | ||
0c425248 AE |
1602 | rbd_assert(write_request == |
1603 | img_request_write_test(img_request)); | |
1604 | if (write_request) | |
bf0d5f50 | 1605 | snapc = img_request->snapc; |
bf0d5f50 AE |
1606 | } |
1607 | ||
1608 | /* Allocate and initialize the request, for the single op */ | |
1609 | ||
1610 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1611 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1612 | if (!osd_req) | |
1613 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1614 | |
430c28c3 | 1615 | if (write_request) |
bf0d5f50 | 1616 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1617 | else |
bf0d5f50 | 1618 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1619 | |
1620 | osd_req->r_callback = rbd_osd_req_callback; | |
1621 | osd_req->r_priv = obj_request; | |
1622 | ||
1623 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1624 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1625 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1626 | ||
1627 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1628 | ||
bf0d5f50 AE |
1629 | return osd_req; |
1630 | } | |
1631 | ||
0eefd470 AE |
1632 | /* |
1633 | * Create a copyup osd request based on the information in the | |
1634 | * object request supplied. A copyup request has two osd ops, | |
1635 | * a copyup method call, and a "normal" write request. | |
1636 | */ | |
1637 | static struct ceph_osd_request * | |
1638 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1639 | { | |
1640 | struct rbd_img_request *img_request; | |
1641 | struct ceph_snap_context *snapc; | |
1642 | struct rbd_device *rbd_dev; | |
1643 | struct ceph_osd_client *osdc; | |
1644 | struct ceph_osd_request *osd_req; | |
1645 | ||
1646 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1647 | img_request = obj_request->img_request; | |
1648 | rbd_assert(img_request); | |
1649 | rbd_assert(img_request_write_test(img_request)); | |
1650 | ||
1651 | /* Allocate and initialize the request, for the two ops */ | |
1652 | ||
1653 | snapc = img_request->snapc; | |
1654 | rbd_dev = img_request->rbd_dev; | |
1655 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1656 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1657 | if (!osd_req) | |
1658 | return NULL; /* ENOMEM */ | |
1659 | ||
1660 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1661 | osd_req->r_callback = rbd_osd_req_callback; | |
1662 | osd_req->r_priv = obj_request; | |
1663 | ||
1664 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1665 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1666 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1667 | ||
1668 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1669 | ||
1670 | return osd_req; | |
1671 | } | |
1672 | ||
1673 | ||
bf0d5f50 AE |
1674 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1675 | { | |
1676 | ceph_osdc_put_request(osd_req); | |
1677 | } | |
1678 | ||
1679 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1680 | ||
1681 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1682 | u64 offset, u64 length, | |
1683 | enum obj_request_type type) | |
1684 | { | |
1685 | struct rbd_obj_request *obj_request; | |
1686 | size_t size; | |
1687 | char *name; | |
1688 | ||
1689 | rbd_assert(obj_request_type_valid(type)); | |
1690 | ||
1691 | size = strlen(object_name) + 1; | |
1692 | obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); | |
1693 | if (!obj_request) | |
1694 | return NULL; | |
1695 | ||
1696 | name = (char *)(obj_request + 1); | |
1697 | obj_request->object_name = memcpy(name, object_name, size); | |
1698 | obj_request->offset = offset; | |
1699 | obj_request->length = length; | |
926f9b3f | 1700 | obj_request->flags = 0; |
bf0d5f50 AE |
1701 | obj_request->which = BAD_WHICH; |
1702 | obj_request->type = type; | |
1703 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1704 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1705 | kref_init(&obj_request->kref); |
1706 | ||
37206ee5 AE |
1707 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1708 | offset, length, (int)type, obj_request); | |
1709 | ||
bf0d5f50 AE |
1710 | return obj_request; |
1711 | } | |
1712 | ||
1713 | static void rbd_obj_request_destroy(struct kref *kref) | |
1714 | { | |
1715 | struct rbd_obj_request *obj_request; | |
1716 | ||
1717 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1718 | ||
37206ee5 AE |
1719 | dout("%s: obj %p\n", __func__, obj_request); |
1720 | ||
bf0d5f50 AE |
1721 | rbd_assert(obj_request->img_request == NULL); |
1722 | rbd_assert(obj_request->which == BAD_WHICH); | |
1723 | ||
1724 | if (obj_request->osd_req) | |
1725 | rbd_osd_req_destroy(obj_request->osd_req); | |
1726 | ||
1727 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1728 | switch (obj_request->type) { | |
9969ebc5 AE |
1729 | case OBJ_REQUEST_NODATA: |
1730 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1731 | case OBJ_REQUEST_BIO: |
1732 | if (obj_request->bio_list) | |
1733 | bio_chain_put(obj_request->bio_list); | |
1734 | break; | |
788e2df3 AE |
1735 | case OBJ_REQUEST_PAGES: |
1736 | if (obj_request->pages) | |
1737 | ceph_release_page_vector(obj_request->pages, | |
1738 | obj_request->page_count); | |
1739 | break; | |
bf0d5f50 AE |
1740 | } |
1741 | ||
1742 | kfree(obj_request); | |
1743 | } | |
1744 | ||
1745 | /* | |
1746 | * Caller is responsible for filling in the list of object requests | |
1747 | * that comprises the image request, and the Linux request pointer | |
1748 | * (if there is one). | |
1749 | */ | |
cc344fa1 AE |
1750 | static struct rbd_img_request *rbd_img_request_create( |
1751 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1752 | u64 offset, u64 length, |
9849e986 AE |
1753 | bool write_request, |
1754 | bool child_request) | |
bf0d5f50 AE |
1755 | { |
1756 | struct rbd_img_request *img_request; | |
bf0d5f50 AE |
1757 | |
1758 | img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); | |
1759 | if (!img_request) | |
1760 | return NULL; | |
1761 | ||
1762 | if (write_request) { | |
1763 | down_read(&rbd_dev->header_rwsem); | |
812164f8 | 1764 | ceph_get_snap_context(rbd_dev->header.snapc); |
bf0d5f50 | 1765 | up_read(&rbd_dev->header_rwsem); |
bf0d5f50 AE |
1766 | } |
1767 | ||
1768 | img_request->rq = NULL; | |
1769 | img_request->rbd_dev = rbd_dev; | |
1770 | img_request->offset = offset; | |
1771 | img_request->length = length; | |
0c425248 AE |
1772 | img_request->flags = 0; |
1773 | if (write_request) { | |
1774 | img_request_write_set(img_request); | |
468521c1 | 1775 | img_request->snapc = rbd_dev->header.snapc; |
0c425248 | 1776 | } else { |
bf0d5f50 | 1777 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1778 | } |
9849e986 AE |
1779 | if (child_request) |
1780 | img_request_child_set(img_request); | |
d0b2e944 AE |
1781 | if (rbd_dev->parent_spec) |
1782 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1783 | spin_lock_init(&img_request->completion_lock); |
1784 | img_request->next_completion = 0; | |
1785 | img_request->callback = NULL; | |
a5a337d4 | 1786 | img_request->result = 0; |
bf0d5f50 AE |
1787 | img_request->obj_request_count = 0; |
1788 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1789 | kref_init(&img_request->kref); | |
1790 | ||
1791 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1792 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1793 | ||
37206ee5 AE |
1794 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1795 | write_request ? "write" : "read", offset, length, | |
1796 | img_request); | |
1797 | ||
bf0d5f50 AE |
1798 | return img_request; |
1799 | } | |
1800 | ||
1801 | static void rbd_img_request_destroy(struct kref *kref) | |
1802 | { | |
1803 | struct rbd_img_request *img_request; | |
1804 | struct rbd_obj_request *obj_request; | |
1805 | struct rbd_obj_request *next_obj_request; | |
1806 | ||
1807 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1808 | ||
37206ee5 AE |
1809 | dout("%s: img %p\n", __func__, img_request); |
1810 | ||
bf0d5f50 AE |
1811 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1812 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1813 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1814 | |
0c425248 | 1815 | if (img_request_write_test(img_request)) |
812164f8 | 1816 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1817 | |
8b3e1a56 AE |
1818 | if (img_request_child_test(img_request)) |
1819 | rbd_obj_request_put(img_request->obj_request); | |
1820 | ||
bf0d5f50 AE |
1821 | kfree(img_request); |
1822 | } | |
1823 | ||
1217857f AE |
1824 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1825 | { | |
6365d33a | 1826 | struct rbd_img_request *img_request; |
1217857f AE |
1827 | unsigned int xferred; |
1828 | int result; | |
8b3e1a56 | 1829 | bool more; |
1217857f | 1830 | |
6365d33a AE |
1831 | rbd_assert(obj_request_img_data_test(obj_request)); |
1832 | img_request = obj_request->img_request; | |
1833 | ||
1217857f AE |
1834 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1835 | xferred = (unsigned int)obj_request->xferred; | |
1836 | result = obj_request->result; | |
1837 | if (result) { | |
1838 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1839 | ||
1840 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1841 | img_request_write_test(img_request) ? "write" : "read", | |
1842 | obj_request->length, obj_request->img_offset, | |
1843 | obj_request->offset); | |
1844 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1845 | result, xferred); | |
1846 | if (!img_request->result) | |
1847 | img_request->result = result; | |
1848 | } | |
1849 | ||
f1a4739f AE |
1850 | /* Image object requests don't own their page array */ |
1851 | ||
1852 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1853 | obj_request->pages = NULL; | |
1854 | obj_request->page_count = 0; | |
1855 | } | |
1856 | ||
8b3e1a56 AE |
1857 | if (img_request_child_test(img_request)) { |
1858 | rbd_assert(img_request->obj_request != NULL); | |
1859 | more = obj_request->which < img_request->obj_request_count - 1; | |
1860 | } else { | |
1861 | rbd_assert(img_request->rq != NULL); | |
1862 | more = blk_end_request(img_request->rq, result, xferred); | |
1863 | } | |
1864 | ||
1865 | return more; | |
1217857f AE |
1866 | } |
1867 | ||
2169238d AE |
1868 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1869 | { | |
1870 | struct rbd_img_request *img_request; | |
1871 | u32 which = obj_request->which; | |
1872 | bool more = true; | |
1873 | ||
6365d33a | 1874 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1875 | img_request = obj_request->img_request; |
1876 | ||
1877 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1878 | rbd_assert(img_request != NULL); | |
2169238d AE |
1879 | rbd_assert(img_request->obj_request_count > 0); |
1880 | rbd_assert(which != BAD_WHICH); | |
1881 | rbd_assert(which < img_request->obj_request_count); | |
1882 | rbd_assert(which >= img_request->next_completion); | |
1883 | ||
1884 | spin_lock_irq(&img_request->completion_lock); | |
1885 | if (which != img_request->next_completion) | |
1886 | goto out; | |
1887 | ||
1888 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1889 | rbd_assert(more); |
1890 | rbd_assert(which < img_request->obj_request_count); | |
1891 | ||
1892 | if (!obj_request_done_test(obj_request)) | |
1893 | break; | |
1217857f | 1894 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1895 | which++; |
1896 | } | |
1897 | ||
1898 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1899 | img_request->next_completion = which; | |
1900 | out: | |
1901 | spin_unlock_irq(&img_request->completion_lock); | |
1902 | ||
1903 | if (!more) | |
1904 | rbd_img_request_complete(img_request); | |
1905 | } | |
1906 | ||
f1a4739f AE |
1907 | /* |
1908 | * Split up an image request into one or more object requests, each | |
1909 | * to a different object. The "type" parameter indicates whether | |
1910 | * "data_desc" is the pointer to the head of a list of bio | |
1911 | * structures, or the base of a page array. In either case this | |
1912 | * function assumes data_desc describes memory sufficient to hold | |
1913 | * all data described by the image request. | |
1914 | */ | |
1915 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1916 | enum obj_request_type type, | |
1917 | void *data_desc) | |
bf0d5f50 AE |
1918 | { |
1919 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1920 | struct rbd_obj_request *obj_request = NULL; | |
1921 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1922 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1923 | struct bio *bio_list; |
1924 | unsigned int bio_offset = 0; | |
1925 | struct page **pages; | |
7da22d29 | 1926 | u64 img_offset; |
bf0d5f50 AE |
1927 | u64 resid; |
1928 | u16 opcode; | |
1929 | ||
f1a4739f AE |
1930 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1931 | (int)type, data_desc); | |
37206ee5 | 1932 | |
430c28c3 | 1933 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1934 | img_offset = img_request->offset; |
bf0d5f50 | 1935 | resid = img_request->length; |
4dda41d3 | 1936 | rbd_assert(resid > 0); |
f1a4739f AE |
1937 | |
1938 | if (type == OBJ_REQUEST_BIO) { | |
1939 | bio_list = data_desc; | |
1940 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
1941 | } else { | |
1942 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
1943 | pages = data_desc; | |
1944 | } | |
1945 | ||
bf0d5f50 | 1946 | while (resid) { |
2fa12320 | 1947 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 1948 | const char *object_name; |
bf0d5f50 AE |
1949 | u64 offset; |
1950 | u64 length; | |
1951 | ||
7da22d29 | 1952 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
1953 | if (!object_name) |
1954 | goto out_unwind; | |
7da22d29 AE |
1955 | offset = rbd_segment_offset(rbd_dev, img_offset); |
1956 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 1957 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 1958 | offset, length, type); |
bf0d5f50 AE |
1959 | kfree(object_name); /* object request has its own copy */ |
1960 | if (!obj_request) | |
1961 | goto out_unwind; | |
1962 | ||
f1a4739f AE |
1963 | if (type == OBJ_REQUEST_BIO) { |
1964 | unsigned int clone_size; | |
1965 | ||
1966 | rbd_assert(length <= (u64)UINT_MAX); | |
1967 | clone_size = (unsigned int)length; | |
1968 | obj_request->bio_list = | |
1969 | bio_chain_clone_range(&bio_list, | |
1970 | &bio_offset, | |
1971 | clone_size, | |
1972 | GFP_ATOMIC); | |
1973 | if (!obj_request->bio_list) | |
1974 | goto out_partial; | |
1975 | } else { | |
1976 | unsigned int page_count; | |
1977 | ||
1978 | obj_request->pages = pages; | |
1979 | page_count = (u32)calc_pages_for(offset, length); | |
1980 | obj_request->page_count = page_count; | |
1981 | if ((offset + length) & ~PAGE_MASK) | |
1982 | page_count--; /* more on last page */ | |
1983 | pages += page_count; | |
1984 | } | |
bf0d5f50 | 1985 | |
2fa12320 AE |
1986 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
1987 | obj_request); | |
1988 | if (!osd_req) | |
bf0d5f50 | 1989 | goto out_partial; |
2fa12320 | 1990 | obj_request->osd_req = osd_req; |
2169238d | 1991 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 1992 | |
2fa12320 AE |
1993 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
1994 | 0, 0); | |
f1a4739f AE |
1995 | if (type == OBJ_REQUEST_BIO) |
1996 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
1997 | obj_request->bio_list, length); | |
1998 | else | |
1999 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
2000 | obj_request->pages, length, | |
2001 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
2002 | |
2003 | if (write_request) | |
2004 | rbd_osd_req_format_write(obj_request); | |
2005 | else | |
2006 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 2007 | |
7da22d29 | 2008 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
2009 | rbd_img_obj_request_add(img_request, obj_request); |
2010 | ||
7da22d29 | 2011 | img_offset += length; |
bf0d5f50 AE |
2012 | resid -= length; |
2013 | } | |
2014 | ||
2015 | return 0; | |
2016 | ||
2017 | out_partial: | |
2018 | rbd_obj_request_put(obj_request); | |
2019 | out_unwind: | |
2020 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
2021 | rbd_obj_request_put(obj_request); | |
2022 | ||
2023 | return -ENOMEM; | |
2024 | } | |
2025 | ||
0eefd470 AE |
2026 | static void |
2027 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2028 | { | |
2029 | struct rbd_img_request *img_request; | |
2030 | struct rbd_device *rbd_dev; | |
2031 | u64 length; | |
2032 | u32 page_count; | |
2033 | ||
2034 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2035 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2036 | img_request = obj_request->img_request; | |
2037 | rbd_assert(img_request); | |
2038 | ||
2039 | rbd_dev = img_request->rbd_dev; | |
2040 | rbd_assert(rbd_dev); | |
2041 | length = (u64)1 << rbd_dev->header.obj_order; | |
2042 | page_count = (u32)calc_pages_for(0, length); | |
2043 | ||
2044 | rbd_assert(obj_request->copyup_pages); | |
2045 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2046 | obj_request->copyup_pages = NULL; | |
2047 | ||
2048 | /* | |
2049 | * We want the transfer count to reflect the size of the | |
2050 | * original write request. There is no such thing as a | |
2051 | * successful short write, so if the request was successful | |
2052 | * we can just set it to the originally-requested length. | |
2053 | */ | |
2054 | if (!obj_request->result) | |
2055 | obj_request->xferred = obj_request->length; | |
2056 | ||
2057 | /* Finish up with the normal image object callback */ | |
2058 | ||
2059 | rbd_img_obj_callback(obj_request); | |
2060 | } | |
2061 | ||
3d7efd18 AE |
2062 | static void |
2063 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2064 | { | |
2065 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2066 | struct ceph_osd_request *osd_req; |
2067 | struct ceph_osd_client *osdc; | |
2068 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2069 | struct page **pages; |
3d7efd18 AE |
2070 | int result; |
2071 | u64 obj_size; | |
2072 | u64 xferred; | |
2073 | ||
2074 | rbd_assert(img_request_child_test(img_request)); | |
2075 | ||
2076 | /* First get what we need from the image request */ | |
2077 | ||
2078 | pages = img_request->copyup_pages; | |
2079 | rbd_assert(pages != NULL); | |
2080 | img_request->copyup_pages = NULL; | |
2081 | ||
2082 | orig_request = img_request->obj_request; | |
2083 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2084 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2085 | result = img_request->result; |
2086 | obj_size = img_request->length; | |
2087 | xferred = img_request->xferred; | |
2088 | ||
0eefd470 AE |
2089 | rbd_dev = img_request->rbd_dev; |
2090 | rbd_assert(rbd_dev); | |
2091 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2092 | ||
3d7efd18 AE |
2093 | rbd_img_request_put(img_request); |
2094 | ||
0eefd470 AE |
2095 | if (result) |
2096 | goto out_err; | |
2097 | ||
2098 | /* Allocate the new copyup osd request for the original request */ | |
2099 | ||
2100 | result = -ENOMEM; | |
2101 | rbd_assert(!orig_request->osd_req); | |
2102 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2103 | if (!osd_req) | |
2104 | goto out_err; | |
2105 | orig_request->osd_req = osd_req; | |
2106 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2107 | |
0eefd470 | 2108 | /* Initialize the copyup op */ |
3d7efd18 | 2109 | |
0eefd470 AE |
2110 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2111 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2112 | false, false); | |
3d7efd18 | 2113 | |
0eefd470 AE |
2114 | /* Then the original write request op */ |
2115 | ||
2116 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2117 | orig_request->offset, | |
2118 | orig_request->length, 0, 0); | |
2119 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2120 | orig_request->length); | |
2121 | ||
2122 | rbd_osd_req_format_write(orig_request); | |
2123 | ||
2124 | /* All set, send it off. */ | |
2125 | ||
2126 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2127 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2128 | result = rbd_obj_request_submit(osdc, orig_request); | |
2129 | if (!result) | |
2130 | return; | |
2131 | out_err: | |
2132 | /* Record the error code and complete the request */ | |
2133 | ||
2134 | orig_request->result = result; | |
2135 | orig_request->xferred = 0; | |
2136 | obj_request_done_set(orig_request); | |
2137 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2138 | } |
2139 | ||
2140 | /* | |
2141 | * Read from the parent image the range of data that covers the | |
2142 | * entire target of the given object request. This is used for | |
2143 | * satisfying a layered image write request when the target of an | |
2144 | * object request from the image request does not exist. | |
2145 | * | |
2146 | * A page array big enough to hold the returned data is allocated | |
2147 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2148 | * When the read completes, this page array will be transferred to | |
2149 | * the original object request for the copyup operation. | |
2150 | * | |
2151 | * If an error occurs, record it as the result of the original | |
2152 | * object request and mark it done so it gets completed. | |
2153 | */ | |
2154 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2155 | { | |
2156 | struct rbd_img_request *img_request = NULL; | |
2157 | struct rbd_img_request *parent_request = NULL; | |
2158 | struct rbd_device *rbd_dev; | |
2159 | u64 img_offset; | |
2160 | u64 length; | |
2161 | struct page **pages = NULL; | |
2162 | u32 page_count; | |
2163 | int result; | |
2164 | ||
2165 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2166 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2167 | ||
2168 | img_request = obj_request->img_request; | |
2169 | rbd_assert(img_request != NULL); | |
2170 | rbd_dev = img_request->rbd_dev; | |
2171 | rbd_assert(rbd_dev->parent != NULL); | |
2172 | ||
0eefd470 AE |
2173 | /* |
2174 | * First things first. The original osd request is of no | |
2175 | * use to use any more, we'll need a new one that can hold | |
2176 | * the two ops in a copyup request. We'll get that later, | |
2177 | * but for now we can release the old one. | |
2178 | */ | |
2179 | rbd_osd_req_destroy(obj_request->osd_req); | |
2180 | obj_request->osd_req = NULL; | |
2181 | ||
3d7efd18 AE |
2182 | /* |
2183 | * Determine the byte range covered by the object in the | |
2184 | * child image to which the original request was to be sent. | |
2185 | */ | |
2186 | img_offset = obj_request->img_offset - obj_request->offset; | |
2187 | length = (u64)1 << rbd_dev->header.obj_order; | |
2188 | ||
a9e8ba2c AE |
2189 | /* |
2190 | * There is no defined parent data beyond the parent | |
2191 | * overlap, so limit what we read at that boundary if | |
2192 | * necessary. | |
2193 | */ | |
2194 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2195 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2196 | length = rbd_dev->parent_overlap - img_offset; | |
2197 | } | |
2198 | ||
3d7efd18 AE |
2199 | /* |
2200 | * Allocate a page array big enough to receive the data read | |
2201 | * from the parent. | |
2202 | */ | |
2203 | page_count = (u32)calc_pages_for(0, length); | |
2204 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2205 | if (IS_ERR(pages)) { | |
2206 | result = PTR_ERR(pages); | |
2207 | pages = NULL; | |
2208 | goto out_err; | |
2209 | } | |
2210 | ||
2211 | result = -ENOMEM; | |
2212 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2213 | img_offset, length, | |
2214 | false, true); | |
2215 | if (!parent_request) | |
2216 | goto out_err; | |
2217 | rbd_obj_request_get(obj_request); | |
2218 | parent_request->obj_request = obj_request; | |
2219 | ||
2220 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2221 | if (result) | |
2222 | goto out_err; | |
2223 | parent_request->copyup_pages = pages; | |
2224 | ||
2225 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2226 | result = rbd_img_request_submit(parent_request); | |
2227 | if (!result) | |
2228 | return 0; | |
2229 | ||
2230 | parent_request->copyup_pages = NULL; | |
2231 | parent_request->obj_request = NULL; | |
2232 | rbd_obj_request_put(obj_request); | |
2233 | out_err: | |
2234 | if (pages) | |
2235 | ceph_release_page_vector(pages, page_count); | |
2236 | if (parent_request) | |
2237 | rbd_img_request_put(parent_request); | |
2238 | obj_request->result = result; | |
2239 | obj_request->xferred = 0; | |
2240 | obj_request_done_set(obj_request); | |
2241 | ||
2242 | return result; | |
2243 | } | |
2244 | ||
c5b5ef6c AE |
2245 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2246 | { | |
c5b5ef6c AE |
2247 | struct rbd_obj_request *orig_request; |
2248 | int result; | |
2249 | ||
2250 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2251 | ||
2252 | /* | |
2253 | * All we need from the object request is the original | |
2254 | * request and the result of the STAT op. Grab those, then | |
2255 | * we're done with the request. | |
2256 | */ | |
2257 | orig_request = obj_request->obj_request; | |
2258 | obj_request->obj_request = NULL; | |
2259 | rbd_assert(orig_request); | |
2260 | rbd_assert(orig_request->img_request); | |
2261 | ||
2262 | result = obj_request->result; | |
2263 | obj_request->result = 0; | |
2264 | ||
2265 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2266 | obj_request, orig_request, result, | |
2267 | obj_request->xferred, obj_request->length); | |
2268 | rbd_obj_request_put(obj_request); | |
2269 | ||
2270 | rbd_assert(orig_request); | |
2271 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2272 | |
2273 | /* | |
2274 | * Our only purpose here is to determine whether the object | |
2275 | * exists, and we don't want to treat the non-existence as | |
2276 | * an error. If something else comes back, transfer the | |
2277 | * error to the original request and complete it now. | |
2278 | */ | |
2279 | if (!result) { | |
2280 | obj_request_existence_set(orig_request, true); | |
2281 | } else if (result == -ENOENT) { | |
2282 | obj_request_existence_set(orig_request, false); | |
2283 | } else if (result) { | |
2284 | orig_request->result = result; | |
3d7efd18 | 2285 | goto out; |
c5b5ef6c AE |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * Resubmit the original request now that we have recorded | |
2290 | * whether the target object exists. | |
2291 | */ | |
b454e36d | 2292 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2293 | out: |
c5b5ef6c AE |
2294 | if (orig_request->result) |
2295 | rbd_obj_request_complete(orig_request); | |
2296 | rbd_obj_request_put(orig_request); | |
2297 | } | |
2298 | ||
2299 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2300 | { | |
2301 | struct rbd_obj_request *stat_request; | |
2302 | struct rbd_device *rbd_dev; | |
2303 | struct ceph_osd_client *osdc; | |
2304 | struct page **pages = NULL; | |
2305 | u32 page_count; | |
2306 | size_t size; | |
2307 | int ret; | |
2308 | ||
2309 | /* | |
2310 | * The response data for a STAT call consists of: | |
2311 | * le64 length; | |
2312 | * struct { | |
2313 | * le32 tv_sec; | |
2314 | * le32 tv_nsec; | |
2315 | * } mtime; | |
2316 | */ | |
2317 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2318 | page_count = (u32)calc_pages_for(0, size); | |
2319 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2320 | if (IS_ERR(pages)) | |
2321 | return PTR_ERR(pages); | |
2322 | ||
2323 | ret = -ENOMEM; | |
2324 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2325 | OBJ_REQUEST_PAGES); | |
2326 | if (!stat_request) | |
2327 | goto out; | |
2328 | ||
2329 | rbd_obj_request_get(obj_request); | |
2330 | stat_request->obj_request = obj_request; | |
2331 | stat_request->pages = pages; | |
2332 | stat_request->page_count = page_count; | |
2333 | ||
2334 | rbd_assert(obj_request->img_request); | |
2335 | rbd_dev = obj_request->img_request->rbd_dev; | |
2336 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2337 | stat_request); | |
2338 | if (!stat_request->osd_req) | |
2339 | goto out; | |
2340 | stat_request->callback = rbd_img_obj_exists_callback; | |
2341 | ||
2342 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2343 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2344 | false, false); | |
9d4df01f | 2345 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2346 | |
2347 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2348 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2349 | out: | |
2350 | if (ret) | |
2351 | rbd_obj_request_put(obj_request); | |
2352 | ||
2353 | return ret; | |
2354 | } | |
2355 | ||
b454e36d AE |
2356 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2357 | { | |
2358 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2359 | struct rbd_device *rbd_dev; |
3d7efd18 | 2360 | bool known; |
b454e36d AE |
2361 | |
2362 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2363 | ||
2364 | img_request = obj_request->img_request; | |
2365 | rbd_assert(img_request); | |
a9e8ba2c | 2366 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2367 | |
b454e36d | 2368 | /* |
a9e8ba2c AE |
2369 | * Only writes to layered images need special handling. |
2370 | * Reads and non-layered writes are simple object requests. | |
2371 | * Layered writes that start beyond the end of the overlap | |
2372 | * with the parent have no parent data, so they too are | |
2373 | * simple object requests. Finally, if the target object is | |
2374 | * known to already exist, its parent data has already been | |
2375 | * copied, so a write to the object can also be handled as a | |
2376 | * simple object request. | |
b454e36d AE |
2377 | */ |
2378 | if (!img_request_write_test(img_request) || | |
2379 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2380 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2381 | ((known = obj_request_known_test(obj_request)) && |
2382 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2383 | |
2384 | struct rbd_device *rbd_dev; | |
2385 | struct ceph_osd_client *osdc; | |
2386 | ||
2387 | rbd_dev = obj_request->img_request->rbd_dev; | |
2388 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2389 | ||
2390 | return rbd_obj_request_submit(osdc, obj_request); | |
2391 | } | |
2392 | ||
2393 | /* | |
3d7efd18 AE |
2394 | * It's a layered write. The target object might exist but |
2395 | * we may not know that yet. If we know it doesn't exist, | |
2396 | * start by reading the data for the full target object from | |
2397 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2398 | */ |
3d7efd18 AE |
2399 | if (known) |
2400 | return rbd_img_obj_parent_read_full(obj_request); | |
2401 | ||
2402 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2403 | |
2404 | return rbd_img_obj_exists_submit(obj_request); | |
2405 | } | |
2406 | ||
bf0d5f50 AE |
2407 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2408 | { | |
bf0d5f50 | 2409 | struct rbd_obj_request *obj_request; |
46faeed4 | 2410 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2411 | |
37206ee5 | 2412 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2413 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2414 | int ret; |
2415 | ||
b454e36d | 2416 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2417 | if (ret) |
2418 | return ret; | |
bf0d5f50 AE |
2419 | } |
2420 | ||
2421 | return 0; | |
2422 | } | |
8b3e1a56 AE |
2423 | |
2424 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2425 | { | |
2426 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2427 | struct rbd_device *rbd_dev; |
2428 | u64 obj_end; | |
8b3e1a56 AE |
2429 | |
2430 | rbd_assert(img_request_child_test(img_request)); | |
2431 | ||
2432 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2433 | rbd_assert(obj_request); |
2434 | rbd_assert(obj_request->img_request); | |
2435 | ||
8b3e1a56 | 2436 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2437 | if (obj_request->result) |
2438 | goto out; | |
2439 | ||
2440 | /* | |
2441 | * We need to zero anything beyond the parent overlap | |
2442 | * boundary. Since rbd_img_obj_request_read_callback() | |
2443 | * will zero anything beyond the end of a short read, an | |
2444 | * easy way to do this is to pretend the data from the | |
2445 | * parent came up short--ending at the overlap boundary. | |
2446 | */ | |
2447 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2448 | obj_end = obj_request->img_offset + obj_request->length; | |
2449 | rbd_dev = obj_request->img_request->rbd_dev; | |
2450 | if (obj_end > rbd_dev->parent_overlap) { | |
2451 | u64 xferred = 0; | |
2452 | ||
2453 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2454 | xferred = rbd_dev->parent_overlap - | |
2455 | obj_request->img_offset; | |
8b3e1a56 | 2456 | |
a9e8ba2c AE |
2457 | obj_request->xferred = min(img_request->xferred, xferred); |
2458 | } else { | |
2459 | obj_request->xferred = img_request->xferred; | |
2460 | } | |
2461 | out: | |
8b3e1a56 AE |
2462 | rbd_img_obj_request_read_callback(obj_request); |
2463 | rbd_obj_request_complete(obj_request); | |
2464 | } | |
2465 | ||
2466 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2467 | { | |
2468 | struct rbd_device *rbd_dev; | |
2469 | struct rbd_img_request *img_request; | |
2470 | int result; | |
2471 | ||
2472 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2473 | rbd_assert(obj_request->img_request != NULL); | |
2474 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2475 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2476 | ||
2477 | rbd_dev = obj_request->img_request->rbd_dev; | |
2478 | rbd_assert(rbd_dev->parent != NULL); | |
2479 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2480 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2481 | obj_request->img_offset, | |
2482 | obj_request->length, | |
2483 | false, true); | |
2484 | result = -ENOMEM; | |
2485 | if (!img_request) | |
2486 | goto out_err; | |
2487 | ||
2488 | rbd_obj_request_get(obj_request); | |
2489 | img_request->obj_request = obj_request; | |
2490 | ||
f1a4739f AE |
2491 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2492 | obj_request->bio_list); | |
8b3e1a56 AE |
2493 | if (result) |
2494 | goto out_err; | |
2495 | ||
2496 | img_request->callback = rbd_img_parent_read_callback; | |
2497 | result = rbd_img_request_submit(img_request); | |
2498 | if (result) | |
2499 | goto out_err; | |
2500 | ||
2501 | return; | |
2502 | out_err: | |
2503 | if (img_request) | |
2504 | rbd_img_request_put(img_request); | |
2505 | obj_request->result = result; | |
2506 | obj_request->xferred = 0; | |
2507 | obj_request_done_set(obj_request); | |
2508 | } | |
bf0d5f50 | 2509 | |
cc4a38bd | 2510 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2511 | { |
2512 | struct rbd_obj_request *obj_request; | |
2169238d | 2513 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2514 | int ret; |
2515 | ||
2516 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2517 | OBJ_REQUEST_NODATA); | |
2518 | if (!obj_request) | |
2519 | return -ENOMEM; | |
2520 | ||
2521 | ret = -ENOMEM; | |
430c28c3 | 2522 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2523 | if (!obj_request->osd_req) |
2524 | goto out; | |
2169238d | 2525 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2526 | |
c99d2d4a | 2527 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2528 | notify_id, 0, 0); |
9d4df01f | 2529 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2530 | |
b8d70035 | 2531 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2532 | out: |
cf81b60e AE |
2533 | if (ret) |
2534 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2535 | |
2536 | return ret; | |
2537 | } | |
2538 | ||
2539 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2540 | { | |
2541 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
b8d70035 AE |
2542 | |
2543 | if (!rbd_dev) | |
2544 | return; | |
2545 | ||
37206ee5 | 2546 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2547 | rbd_dev->header_name, (unsigned long long)notify_id, |
2548 | (unsigned int)opcode); | |
2549 | (void)rbd_dev_refresh(rbd_dev); | |
b8d70035 | 2550 | |
cc4a38bd | 2551 | rbd_obj_notify_ack(rbd_dev, notify_id); |
b8d70035 AE |
2552 | } |
2553 | ||
9969ebc5 AE |
2554 | /* |
2555 | * Request sync osd watch/unwatch. The value of "start" determines | |
2556 | * whether a watch request is being initiated or torn down. | |
2557 | */ | |
2558 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2559 | { | |
2560 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2561 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2562 | int ret; |
2563 | ||
2564 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2565 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2566 | ||
2567 | if (start) { | |
3c663bbd | 2568 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2569 | &rbd_dev->watch_event); |
2570 | if (ret < 0) | |
2571 | return ret; | |
8eb87565 | 2572 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2573 | } |
2574 | ||
2575 | ret = -ENOMEM; | |
2576 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2577 | OBJ_REQUEST_NODATA); | |
2578 | if (!obj_request) | |
2579 | goto out_cancel; | |
2580 | ||
430c28c3 AE |
2581 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2582 | if (!obj_request->osd_req) | |
2583 | goto out_cancel; | |
2584 | ||
8eb87565 | 2585 | if (start) |
975241af | 2586 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2587 | else |
6977c3f9 | 2588 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2589 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2590 | |
2591 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
b21ebddd | 2592 | rbd_dev->watch_event->cookie, 0, start); |
9d4df01f | 2593 | rbd_osd_req_format_write(obj_request); |
2169238d | 2594 | |
9969ebc5 AE |
2595 | ret = rbd_obj_request_submit(osdc, obj_request); |
2596 | if (ret) | |
2597 | goto out_cancel; | |
2598 | ret = rbd_obj_request_wait(obj_request); | |
2599 | if (ret) | |
2600 | goto out_cancel; | |
9969ebc5 AE |
2601 | ret = obj_request->result; |
2602 | if (ret) | |
2603 | goto out_cancel; | |
2604 | ||
8eb87565 AE |
2605 | /* |
2606 | * A watch request is set to linger, so the underlying osd | |
2607 | * request won't go away until we unregister it. We retain | |
2608 | * a pointer to the object request during that time (in | |
2609 | * rbd_dev->watch_request), so we'll keep a reference to | |
2610 | * it. We'll drop that reference (below) after we've | |
2611 | * unregistered it. | |
2612 | */ | |
2613 | if (start) { | |
2614 | rbd_dev->watch_request = obj_request; | |
2615 | ||
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | /* We have successfully torn down the watch request */ | |
2620 | ||
2621 | rbd_obj_request_put(rbd_dev->watch_request); | |
2622 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2623 | out_cancel: |
2624 | /* Cancel the event if we're tearing down, or on error */ | |
2625 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2626 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2627 | if (obj_request) |
2628 | rbd_obj_request_put(obj_request); | |
2629 | ||
2630 | return ret; | |
2631 | } | |
2632 | ||
36be9a76 | 2633 | /* |
f40eb349 AE |
2634 | * Synchronous osd object method call. Returns the number of bytes |
2635 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
2636 | */ |
2637 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2638 | const char *object_name, | |
2639 | const char *class_name, | |
2640 | const char *method_name, | |
4157976b | 2641 | const void *outbound, |
36be9a76 | 2642 | size_t outbound_size, |
4157976b | 2643 | void *inbound, |
e2a58ee5 | 2644 | size_t inbound_size) |
36be9a76 | 2645 | { |
2169238d | 2646 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2647 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2648 | struct page **pages; |
2649 | u32 page_count; | |
2650 | int ret; | |
2651 | ||
2652 | /* | |
6010a451 AE |
2653 | * Method calls are ultimately read operations. The result |
2654 | * should placed into the inbound buffer provided. They | |
2655 | * also supply outbound data--parameters for the object | |
2656 | * method. Currently if this is present it will be a | |
2657 | * snapshot id. | |
36be9a76 | 2658 | */ |
57385b51 | 2659 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
2660 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2661 | if (IS_ERR(pages)) | |
2662 | return PTR_ERR(pages); | |
2663 | ||
2664 | ret = -ENOMEM; | |
6010a451 | 2665 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2666 | OBJ_REQUEST_PAGES); |
2667 | if (!obj_request) | |
2668 | goto out; | |
2669 | ||
2670 | obj_request->pages = pages; | |
2671 | obj_request->page_count = page_count; | |
2672 | ||
430c28c3 | 2673 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2674 | if (!obj_request->osd_req) |
2675 | goto out; | |
2676 | ||
c99d2d4a | 2677 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2678 | class_name, method_name); |
2679 | if (outbound_size) { | |
2680 | struct ceph_pagelist *pagelist; | |
2681 | ||
2682 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2683 | if (!pagelist) | |
2684 | goto out; | |
2685 | ||
2686 | ceph_pagelist_init(pagelist); | |
2687 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2688 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2689 | pagelist); | |
2690 | } | |
a4ce40a9 AE |
2691 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2692 | obj_request->pages, inbound_size, | |
44cd188d | 2693 | 0, false, false); |
9d4df01f | 2694 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2695 | |
36be9a76 AE |
2696 | ret = rbd_obj_request_submit(osdc, obj_request); |
2697 | if (ret) | |
2698 | goto out; | |
2699 | ret = rbd_obj_request_wait(obj_request); | |
2700 | if (ret) | |
2701 | goto out; | |
2702 | ||
2703 | ret = obj_request->result; | |
2704 | if (ret < 0) | |
2705 | goto out; | |
57385b51 AE |
2706 | |
2707 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
2708 | ret = (int)obj_request->xferred; | |
903bb32e | 2709 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2710 | out: |
2711 | if (obj_request) | |
2712 | rbd_obj_request_put(obj_request); | |
2713 | else | |
2714 | ceph_release_page_vector(pages, page_count); | |
2715 | ||
2716 | return ret; | |
2717 | } | |
2718 | ||
bf0d5f50 | 2719 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2720 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2721 | { |
2722 | struct rbd_device *rbd_dev = q->queuedata; | |
2723 | bool read_only = rbd_dev->mapping.read_only; | |
2724 | struct request *rq; | |
2725 | int result; | |
2726 | ||
2727 | while ((rq = blk_fetch_request(q))) { | |
2728 | bool write_request = rq_data_dir(rq) == WRITE; | |
2729 | struct rbd_img_request *img_request; | |
2730 | u64 offset; | |
2731 | u64 length; | |
2732 | ||
2733 | /* Ignore any non-FS requests that filter through. */ | |
2734 | ||
2735 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2736 | dout("%s: non-fs request type %d\n", __func__, |
2737 | (int) rq->cmd_type); | |
2738 | __blk_end_request_all(rq, 0); | |
2739 | continue; | |
2740 | } | |
2741 | ||
2742 | /* Ignore/skip any zero-length requests */ | |
2743 | ||
2744 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2745 | length = (u64) blk_rq_bytes(rq); | |
2746 | ||
2747 | if (!length) { | |
2748 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2749 | __blk_end_request_all(rq, 0); |
2750 | continue; | |
2751 | } | |
2752 | ||
2753 | spin_unlock_irq(q->queue_lock); | |
2754 | ||
2755 | /* Disallow writes to a read-only device */ | |
2756 | ||
2757 | if (write_request) { | |
2758 | result = -EROFS; | |
2759 | if (read_only) | |
2760 | goto end_request; | |
2761 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2762 | } | |
2763 | ||
6d292906 AE |
2764 | /* |
2765 | * Quit early if the mapped snapshot no longer | |
2766 | * exists. It's still possible the snapshot will | |
2767 | * have disappeared by the time our request arrives | |
2768 | * at the osd, but there's no sense in sending it if | |
2769 | * we already know. | |
2770 | */ | |
2771 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2772 | dout("request for non-existent snapshot"); |
2773 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2774 | result = -ENXIO; | |
2775 | goto end_request; | |
2776 | } | |
2777 | ||
bf0d5f50 | 2778 | result = -EINVAL; |
c0cd10db AE |
2779 | if (offset && length > U64_MAX - offset + 1) { |
2780 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n", | |
2781 | offset, length); | |
bf0d5f50 | 2782 | goto end_request; /* Shouldn't happen */ |
c0cd10db | 2783 | } |
bf0d5f50 AE |
2784 | |
2785 | result = -ENOMEM; | |
2786 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2787 | write_request, false); |
bf0d5f50 AE |
2788 | if (!img_request) |
2789 | goto end_request; | |
2790 | ||
2791 | img_request->rq = rq; | |
2792 | ||
f1a4739f AE |
2793 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2794 | rq->bio); | |
bf0d5f50 AE |
2795 | if (!result) |
2796 | result = rbd_img_request_submit(img_request); | |
2797 | if (result) | |
2798 | rbd_img_request_put(img_request); | |
2799 | end_request: | |
2800 | spin_lock_irq(q->queue_lock); | |
2801 | if (result < 0) { | |
7da22d29 AE |
2802 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2803 | write_request ? "write" : "read", | |
2804 | length, offset, result); | |
2805 | ||
bf0d5f50 AE |
2806 | __blk_end_request_all(rq, result); |
2807 | } | |
2808 | } | |
2809 | } | |
2810 | ||
602adf40 YS |
2811 | /* |
2812 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2813 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2814 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2815 | */ |
2816 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2817 | struct bio_vec *bvec) | |
2818 | { | |
2819 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2820 | sector_t sector_offset; |
2821 | sector_t sectors_per_obj; | |
2822 | sector_t obj_sector_offset; | |
2823 | int ret; | |
2824 | ||
2825 | /* | |
2826 | * Find how far into its rbd object the partition-relative | |
2827 | * bio start sector is to offset relative to the enclosing | |
2828 | * device. | |
2829 | */ | |
2830 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2831 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2832 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2833 | ||
2834 | /* | |
2835 | * Compute the number of bytes from that offset to the end | |
2836 | * of the object. Account for what's already used by the bio. | |
2837 | */ | |
2838 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2839 | if (ret > bmd->bi_size) | |
2840 | ret -= bmd->bi_size; | |
2841 | else | |
2842 | ret = 0; | |
2843 | ||
2844 | /* | |
2845 | * Don't send back more than was asked for. And if the bio | |
2846 | * was empty, let the whole thing through because: "Note | |
2847 | * that a block device *must* allow a single page to be | |
2848 | * added to an empty bio." | |
2849 | */ | |
2850 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2851 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2852 | ret = (int) bvec->bv_len; | |
2853 | ||
2854 | return ret; | |
602adf40 YS |
2855 | } |
2856 | ||
2857 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2858 | { | |
2859 | struct gendisk *disk = rbd_dev->disk; | |
2860 | ||
2861 | if (!disk) | |
2862 | return; | |
2863 | ||
a0cab924 AE |
2864 | rbd_dev->disk = NULL; |
2865 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 2866 | del_gendisk(disk); |
a0cab924 AE |
2867 | if (disk->queue) |
2868 | blk_cleanup_queue(disk->queue); | |
2869 | } | |
602adf40 YS |
2870 | put_disk(disk); |
2871 | } | |
2872 | ||
788e2df3 AE |
2873 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2874 | const char *object_name, | |
7097f8df | 2875 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
2876 | |
2877 | { | |
2169238d | 2878 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2879 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2880 | struct page **pages = NULL; |
2881 | u32 page_count; | |
1ceae7ef | 2882 | size_t size; |
788e2df3 AE |
2883 | int ret; |
2884 | ||
2885 | page_count = (u32) calc_pages_for(offset, length); | |
2886 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2887 | if (IS_ERR(pages)) | |
2888 | ret = PTR_ERR(pages); | |
2889 | ||
2890 | ret = -ENOMEM; | |
2891 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2892 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2893 | if (!obj_request) |
2894 | goto out; | |
2895 | ||
2896 | obj_request->pages = pages; | |
2897 | obj_request->page_count = page_count; | |
2898 | ||
430c28c3 | 2899 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2900 | if (!obj_request->osd_req) |
2901 | goto out; | |
2902 | ||
c99d2d4a AE |
2903 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2904 | offset, length, 0, 0); | |
406e2c9f | 2905 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2906 | obj_request->pages, |
44cd188d AE |
2907 | obj_request->length, |
2908 | obj_request->offset & ~PAGE_MASK, | |
2909 | false, false); | |
9d4df01f | 2910 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2911 | |
788e2df3 AE |
2912 | ret = rbd_obj_request_submit(osdc, obj_request); |
2913 | if (ret) | |
2914 | goto out; | |
2915 | ret = rbd_obj_request_wait(obj_request); | |
2916 | if (ret) | |
2917 | goto out; | |
2918 | ||
2919 | ret = obj_request->result; | |
2920 | if (ret < 0) | |
2921 | goto out; | |
1ceae7ef AE |
2922 | |
2923 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2924 | size = (size_t) obj_request->xferred; | |
903bb32e | 2925 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
2926 | rbd_assert(size <= (size_t)INT_MAX); |
2927 | ret = (int)size; | |
788e2df3 AE |
2928 | out: |
2929 | if (obj_request) | |
2930 | rbd_obj_request_put(obj_request); | |
2931 | else | |
2932 | ceph_release_page_vector(pages, page_count); | |
2933 | ||
2934 | return ret; | |
2935 | } | |
2936 | ||
602adf40 | 2937 | /* |
4156d998 AE |
2938 | * Read the complete header for the given rbd device. |
2939 | * | |
2940 | * Returns a pointer to a dynamically-allocated buffer containing | |
2941 | * the complete and validated header. Caller can pass the address | |
2942 | * of a variable that will be filled in with the version of the | |
2943 | * header object at the time it was read. | |
2944 | * | |
2945 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 2946 | */ |
4156d998 | 2947 | static struct rbd_image_header_ondisk * |
7097f8df | 2948 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev) |
602adf40 | 2949 | { |
4156d998 | 2950 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 2951 | u32 snap_count = 0; |
4156d998 AE |
2952 | u64 names_size = 0; |
2953 | u32 want_count; | |
2954 | int ret; | |
602adf40 | 2955 | |
00f1f36f | 2956 | /* |
4156d998 AE |
2957 | * The complete header will include an array of its 64-bit |
2958 | * snapshot ids, followed by the names of those snapshots as | |
2959 | * a contiguous block of NUL-terminated strings. Note that | |
2960 | * the number of snapshots could change by the time we read | |
2961 | * it in, in which case we re-read it. | |
00f1f36f | 2962 | */ |
4156d998 AE |
2963 | do { |
2964 | size_t size; | |
2965 | ||
2966 | kfree(ondisk); | |
2967 | ||
2968 | size = sizeof (*ondisk); | |
2969 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
2970 | size += names_size; | |
2971 | ondisk = kmalloc(size, GFP_KERNEL); | |
2972 | if (!ondisk) | |
2973 | return ERR_PTR(-ENOMEM); | |
2974 | ||
788e2df3 | 2975 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 2976 | 0, size, ondisk); |
4156d998 AE |
2977 | if (ret < 0) |
2978 | goto out_err; | |
c0cd10db | 2979 | if ((size_t)ret < size) { |
4156d998 | 2980 | ret = -ENXIO; |
06ecc6cb AE |
2981 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
2982 | size, ret); | |
4156d998 AE |
2983 | goto out_err; |
2984 | } | |
2985 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
2986 | ret = -ENXIO; | |
06ecc6cb | 2987 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 2988 | goto out_err; |
81e759fb | 2989 | } |
602adf40 | 2990 | |
4156d998 AE |
2991 | names_size = le64_to_cpu(ondisk->snap_names_len); |
2992 | want_count = snap_count; | |
2993 | snap_count = le32_to_cpu(ondisk->snap_count); | |
2994 | } while (snap_count != want_count); | |
00f1f36f | 2995 | |
4156d998 | 2996 | return ondisk; |
00f1f36f | 2997 | |
4156d998 AE |
2998 | out_err: |
2999 | kfree(ondisk); | |
3000 | ||
3001 | return ERR_PTR(ret); | |
3002 | } | |
3003 | ||
3004 | /* | |
3005 | * reload the ondisk the header | |
3006 | */ | |
3007 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
3008 | struct rbd_image_header *header) | |
3009 | { | |
3010 | struct rbd_image_header_ondisk *ondisk; | |
4156d998 | 3011 | int ret; |
602adf40 | 3012 | |
7097f8df | 3013 | ondisk = rbd_dev_v1_header_read(rbd_dev); |
4156d998 AE |
3014 | if (IS_ERR(ondisk)) |
3015 | return PTR_ERR(ondisk); | |
3016 | ret = rbd_header_from_disk(header, ondisk); | |
4156d998 AE |
3017 | kfree(ondisk); |
3018 | ||
3019 | return ret; | |
602adf40 YS |
3020 | } |
3021 | ||
41f38c2b | 3022 | static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
dfc5606d YS |
3023 | { |
3024 | struct rbd_snap *snap; | |
a0593290 | 3025 | struct rbd_snap *next; |
dfc5606d | 3026 | |
6087b51b AE |
3027 | list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) { |
3028 | list_del(&snap->node); | |
3029 | rbd_snap_destroy(snap); | |
3030 | } | |
dfc5606d YS |
3031 | } |
3032 | ||
9478554a AE |
3033 | static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
3034 | { | |
0d7dbfce | 3035 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
9478554a AE |
3036 | return; |
3037 | ||
e28626a0 AE |
3038 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) { |
3039 | sector_t size; | |
3040 | ||
3041 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
3042 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3043 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3044 | set_capacity(rbd_dev->disk, size); | |
3045 | } | |
9478554a AE |
3046 | } |
3047 | ||
602adf40 YS |
3048 | /* |
3049 | * only read the first part of the ondisk header, without the snaps info | |
3050 | */ | |
cc4a38bd | 3051 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev) |
602adf40 YS |
3052 | { |
3053 | int ret; | |
3054 | struct rbd_image_header h; | |
602adf40 YS |
3055 | |
3056 | ret = rbd_read_header(rbd_dev, &h); | |
3057 | if (ret < 0) | |
3058 | return ret; | |
3059 | ||
a51aa0c0 JD |
3060 | down_write(&rbd_dev->header_rwsem); |
3061 | ||
9478554a AE |
3062 | /* Update image size, and check for resize of mapped image */ |
3063 | rbd_dev->header.image_size = h.image_size; | |
3064 | rbd_update_mapping_size(rbd_dev); | |
9db4b3e3 | 3065 | |
849b4260 | 3066 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3067 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3068 | kfree(rbd_dev->header.snap_names); |
d1d25646 | 3069 | /* osd requests may still refer to snapc */ |
812164f8 | 3070 | ceph_put_snap_context(rbd_dev->header.snapc); |
602adf40 | 3071 | |
93a24e08 | 3072 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3073 | rbd_dev->header.snapc = h.snapc; |
3074 | rbd_dev->header.snap_names = h.snap_names; | |
3075 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 | 3076 | /* Free the extra copy of the object prefix */ |
c0cd10db AE |
3077 | if (strcmp(rbd_dev->header.object_prefix, h.object_prefix)) |
3078 | rbd_warn(rbd_dev, "object prefix changed (ignoring)"); | |
849b4260 AE |
3079 | kfree(h.object_prefix); |
3080 | ||
304f6808 | 3081 | ret = rbd_dev_snaps_update(rbd_dev); |
dfc5606d | 3082 | |
c666601a | 3083 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3084 | |
dfc5606d | 3085 | return ret; |
602adf40 YS |
3086 | } |
3087 | ||
cc4a38bd | 3088 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3089 | { |
a3fbe5d4 | 3090 | u64 image_size; |
1fe5e993 AE |
3091 | int ret; |
3092 | ||
117973fb | 3093 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
a3fbe5d4 | 3094 | image_size = rbd_dev->header.image_size; |
1fe5e993 | 3095 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb | 3096 | if (rbd_dev->image_format == 1) |
cc4a38bd | 3097 | ret = rbd_dev_v1_refresh(rbd_dev); |
117973fb | 3098 | else |
cc4a38bd | 3099 | ret = rbd_dev_v2_refresh(rbd_dev); |
1fe5e993 | 3100 | mutex_unlock(&ctl_mutex); |
522a0cc0 AE |
3101 | if (ret) |
3102 | rbd_warn(rbd_dev, "got notification but failed to " | |
3103 | " update snaps: %d\n", ret); | |
a3fbe5d4 AE |
3104 | if (image_size != rbd_dev->header.image_size) |
3105 | revalidate_disk(rbd_dev->disk); | |
1fe5e993 AE |
3106 | |
3107 | return ret; | |
3108 | } | |
3109 | ||
602adf40 YS |
3110 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3111 | { | |
3112 | struct gendisk *disk; | |
3113 | struct request_queue *q; | |
593a9e7b | 3114 | u64 segment_size; |
602adf40 | 3115 | |
602adf40 | 3116 | /* create gendisk info */ |
602adf40 YS |
3117 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3118 | if (!disk) | |
1fcdb8aa | 3119 | return -ENOMEM; |
602adf40 | 3120 | |
f0f8cef5 | 3121 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3122 | rbd_dev->dev_id); |
602adf40 YS |
3123 | disk->major = rbd_dev->major; |
3124 | disk->first_minor = 0; | |
3125 | disk->fops = &rbd_bd_ops; | |
3126 | disk->private_data = rbd_dev; | |
3127 | ||
bf0d5f50 | 3128 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3129 | if (!q) |
3130 | goto out_disk; | |
029bcbd8 | 3131 | |
593a9e7b AE |
3132 | /* We use the default size, but let's be explicit about it. */ |
3133 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3134 | ||
029bcbd8 | 3135 | /* set io sizes to object size */ |
593a9e7b AE |
3136 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3137 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3138 | blk_queue_max_segment_size(q, segment_size); | |
3139 | blk_queue_io_min(q, segment_size); | |
3140 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3141 | |
602adf40 YS |
3142 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3143 | disk->queue = q; | |
3144 | ||
3145 | q->queuedata = rbd_dev; | |
3146 | ||
3147 | rbd_dev->disk = disk; | |
602adf40 | 3148 | |
602adf40 | 3149 | return 0; |
602adf40 YS |
3150 | out_disk: |
3151 | put_disk(disk); | |
1fcdb8aa AE |
3152 | |
3153 | return -ENOMEM; | |
602adf40 YS |
3154 | } |
3155 | ||
dfc5606d YS |
3156 | /* |
3157 | sysfs | |
3158 | */ | |
3159 | ||
593a9e7b AE |
3160 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3161 | { | |
3162 | return container_of(dev, struct rbd_device, dev); | |
3163 | } | |
3164 | ||
dfc5606d YS |
3165 | static ssize_t rbd_size_show(struct device *dev, |
3166 | struct device_attribute *attr, char *buf) | |
3167 | { | |
593a9e7b | 3168 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3169 | |
fc71d833 AE |
3170 | return sprintf(buf, "%llu\n", |
3171 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3172 | } |
3173 | ||
34b13184 AE |
3174 | /* |
3175 | * Note this shows the features for whatever's mapped, which is not | |
3176 | * necessarily the base image. | |
3177 | */ | |
3178 | static ssize_t rbd_features_show(struct device *dev, | |
3179 | struct device_attribute *attr, char *buf) | |
3180 | { | |
3181 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3182 | ||
3183 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3184 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3185 | } |
3186 | ||
dfc5606d YS |
3187 | static ssize_t rbd_major_show(struct device *dev, |
3188 | struct device_attribute *attr, char *buf) | |
3189 | { | |
593a9e7b | 3190 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3191 | |
fc71d833 AE |
3192 | if (rbd_dev->major) |
3193 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3194 | ||
3195 | return sprintf(buf, "(none)\n"); | |
3196 | ||
dfc5606d YS |
3197 | } |
3198 | ||
3199 | static ssize_t rbd_client_id_show(struct device *dev, | |
3200 | struct device_attribute *attr, char *buf) | |
602adf40 | 3201 | { |
593a9e7b | 3202 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3203 | |
1dbb4399 AE |
3204 | return sprintf(buf, "client%lld\n", |
3205 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3206 | } |
3207 | ||
dfc5606d YS |
3208 | static ssize_t rbd_pool_show(struct device *dev, |
3209 | struct device_attribute *attr, char *buf) | |
602adf40 | 3210 | { |
593a9e7b | 3211 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3212 | |
0d7dbfce | 3213 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3214 | } |
3215 | ||
9bb2f334 AE |
3216 | static ssize_t rbd_pool_id_show(struct device *dev, |
3217 | struct device_attribute *attr, char *buf) | |
3218 | { | |
3219 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3220 | ||
0d7dbfce | 3221 | return sprintf(buf, "%llu\n", |
fc71d833 | 3222 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3223 | } |
3224 | ||
dfc5606d YS |
3225 | static ssize_t rbd_name_show(struct device *dev, |
3226 | struct device_attribute *attr, char *buf) | |
3227 | { | |
593a9e7b | 3228 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3229 | |
a92ffdf8 AE |
3230 | if (rbd_dev->spec->image_name) |
3231 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3232 | ||
3233 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3234 | } |
3235 | ||
589d30e0 AE |
3236 | static ssize_t rbd_image_id_show(struct device *dev, |
3237 | struct device_attribute *attr, char *buf) | |
3238 | { | |
3239 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3240 | ||
0d7dbfce | 3241 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3242 | } |
3243 | ||
34b13184 AE |
3244 | /* |
3245 | * Shows the name of the currently-mapped snapshot (or | |
3246 | * RBD_SNAP_HEAD_NAME for the base image). | |
3247 | */ | |
dfc5606d YS |
3248 | static ssize_t rbd_snap_show(struct device *dev, |
3249 | struct device_attribute *attr, | |
3250 | char *buf) | |
3251 | { | |
593a9e7b | 3252 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3253 | |
0d7dbfce | 3254 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3255 | } |
3256 | ||
86b00e0d AE |
3257 | /* |
3258 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3259 | * for the parent image. If there is no parent, simply shows | |
3260 | * "(no parent image)". | |
3261 | */ | |
3262 | static ssize_t rbd_parent_show(struct device *dev, | |
3263 | struct device_attribute *attr, | |
3264 | char *buf) | |
3265 | { | |
3266 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3267 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3268 | int count; | |
3269 | char *bufp = buf; | |
3270 | ||
3271 | if (!spec) | |
3272 | return sprintf(buf, "(no parent image)\n"); | |
3273 | ||
3274 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3275 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3276 | if (count < 0) | |
3277 | return count; | |
3278 | bufp += count; | |
3279 | ||
3280 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3281 | spec->image_name ? spec->image_name : "(unknown)"); | |
3282 | if (count < 0) | |
3283 | return count; | |
3284 | bufp += count; | |
3285 | ||
3286 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3287 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3288 | if (count < 0) | |
3289 | return count; | |
3290 | bufp += count; | |
3291 | ||
3292 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3293 | if (count < 0) | |
3294 | return count; | |
3295 | bufp += count; | |
3296 | ||
3297 | return (ssize_t) (bufp - buf); | |
3298 | } | |
3299 | ||
dfc5606d YS |
3300 | static ssize_t rbd_image_refresh(struct device *dev, |
3301 | struct device_attribute *attr, | |
3302 | const char *buf, | |
3303 | size_t size) | |
3304 | { | |
593a9e7b | 3305 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3306 | int ret; |
602adf40 | 3307 | |
cc4a38bd | 3308 | ret = rbd_dev_refresh(rbd_dev); |
b813623a AE |
3309 | |
3310 | return ret < 0 ? ret : size; | |
dfc5606d | 3311 | } |
602adf40 | 3312 | |
dfc5606d | 3313 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3314 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3315 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3316 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3317 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3318 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3319 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3320 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3321 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3322 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3323 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3324 | |
3325 | static struct attribute *rbd_attrs[] = { | |
3326 | &dev_attr_size.attr, | |
34b13184 | 3327 | &dev_attr_features.attr, |
dfc5606d YS |
3328 | &dev_attr_major.attr, |
3329 | &dev_attr_client_id.attr, | |
3330 | &dev_attr_pool.attr, | |
9bb2f334 | 3331 | &dev_attr_pool_id.attr, |
dfc5606d | 3332 | &dev_attr_name.attr, |
589d30e0 | 3333 | &dev_attr_image_id.attr, |
dfc5606d | 3334 | &dev_attr_current_snap.attr, |
86b00e0d | 3335 | &dev_attr_parent.attr, |
dfc5606d | 3336 | &dev_attr_refresh.attr, |
dfc5606d YS |
3337 | NULL |
3338 | }; | |
3339 | ||
3340 | static struct attribute_group rbd_attr_group = { | |
3341 | .attrs = rbd_attrs, | |
3342 | }; | |
3343 | ||
3344 | static const struct attribute_group *rbd_attr_groups[] = { | |
3345 | &rbd_attr_group, | |
3346 | NULL | |
3347 | }; | |
3348 | ||
3349 | static void rbd_sysfs_dev_release(struct device *dev) | |
3350 | { | |
3351 | } | |
3352 | ||
3353 | static struct device_type rbd_device_type = { | |
3354 | .name = "rbd", | |
3355 | .groups = rbd_attr_groups, | |
3356 | .release = rbd_sysfs_dev_release, | |
3357 | }; | |
3358 | ||
8b8fb99c AE |
3359 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3360 | { | |
3361 | kref_get(&spec->kref); | |
3362 | ||
3363 | return spec; | |
3364 | } | |
3365 | ||
3366 | static void rbd_spec_free(struct kref *kref); | |
3367 | static void rbd_spec_put(struct rbd_spec *spec) | |
3368 | { | |
3369 | if (spec) | |
3370 | kref_put(&spec->kref, rbd_spec_free); | |
3371 | } | |
3372 | ||
3373 | static struct rbd_spec *rbd_spec_alloc(void) | |
3374 | { | |
3375 | struct rbd_spec *spec; | |
3376 | ||
3377 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3378 | if (!spec) | |
3379 | return NULL; | |
3380 | kref_init(&spec->kref); | |
3381 | ||
8b8fb99c AE |
3382 | return spec; |
3383 | } | |
3384 | ||
3385 | static void rbd_spec_free(struct kref *kref) | |
3386 | { | |
3387 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3388 | ||
3389 | kfree(spec->pool_name); | |
3390 | kfree(spec->image_id); | |
3391 | kfree(spec->image_name); | |
3392 | kfree(spec->snap_name); | |
3393 | kfree(spec); | |
3394 | } | |
3395 | ||
cc344fa1 | 3396 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3397 | struct rbd_spec *spec) |
3398 | { | |
3399 | struct rbd_device *rbd_dev; | |
3400 | ||
3401 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3402 | if (!rbd_dev) | |
3403 | return NULL; | |
3404 | ||
3405 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3406 | rbd_dev->flags = 0; |
c53d5893 AE |
3407 | INIT_LIST_HEAD(&rbd_dev->node); |
3408 | INIT_LIST_HEAD(&rbd_dev->snaps); | |
3409 | init_rwsem(&rbd_dev->header_rwsem); | |
3410 | ||
3411 | rbd_dev->spec = spec; | |
3412 | rbd_dev->rbd_client = rbdc; | |
3413 | ||
0903e875 AE |
3414 | /* Initialize the layout used for all rbd requests */ |
3415 | ||
3416 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3417 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3418 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3419 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3420 | ||
c53d5893 AE |
3421 | return rbd_dev; |
3422 | } | |
3423 | ||
3424 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3425 | { | |
c53d5893 AE |
3426 | rbd_put_client(rbd_dev->rbd_client); |
3427 | rbd_spec_put(rbd_dev->spec); | |
3428 | kfree(rbd_dev); | |
3429 | } | |
3430 | ||
6087b51b | 3431 | static void rbd_snap_destroy(struct rbd_snap *snap) |
dfc5606d | 3432 | { |
3e83b65b AE |
3433 | kfree(snap->name); |
3434 | kfree(snap); | |
dfc5606d YS |
3435 | } |
3436 | ||
6087b51b | 3437 | static struct rbd_snap *rbd_snap_create(struct rbd_device *rbd_dev, |
c8d18425 | 3438 | const char *snap_name, |
34b13184 AE |
3439 | u64 snap_id, u64 snap_size, |
3440 | u64 snap_features) | |
dfc5606d | 3441 | { |
4e891e0a | 3442 | struct rbd_snap *snap; |
4e891e0a AE |
3443 | |
3444 | snap = kzalloc(sizeof (*snap), GFP_KERNEL); | |
dfc5606d | 3445 | if (!snap) |
4e891e0a AE |
3446 | return ERR_PTR(-ENOMEM); |
3447 | ||
6e584f52 | 3448 | snap->name = snap_name; |
c8d18425 AE |
3449 | snap->id = snap_id; |
3450 | snap->size = snap_size; | |
34b13184 | 3451 | snap->features = snap_features; |
4e891e0a AE |
3452 | |
3453 | return snap; | |
dfc5606d YS |
3454 | } |
3455 | ||
6e584f52 AE |
3456 | /* |
3457 | * Returns a dynamically-allocated snapshot name if successful, or a | |
3458 | * pointer-coded error otherwise. | |
3459 | */ | |
54cac61f AE |
3460 | static const char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, |
3461 | u64 snap_id, u64 *snap_size, u64 *snap_features) | |
cd892126 | 3462 | { |
cb75223d | 3463 | const char *snap_name; |
54cac61f | 3464 | u32 which; |
cd892126 | 3465 | |
54cac61f AE |
3466 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
3467 | if (which == BAD_SNAP_INDEX) | |
3468 | return ERR_PTR(-ENOENT); | |
9682fc6d | 3469 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
6e584f52 AE |
3470 | if (!snap_name) |
3471 | return ERR_PTR(-ENOMEM); | |
3472 | ||
3473 | *snap_size = rbd_dev->header.snap_sizes[which]; | |
3474 | *snap_features = 0; /* No features for v1 */ | |
3475 | ||
cd892126 AE |
3476 | return snap_name; |
3477 | } | |
3478 | ||
9d475de5 AE |
3479 | /* |
3480 | * Get the size and object order for an image snapshot, or if | |
3481 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3482 | * image. | |
3483 | */ | |
3484 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3485 | u8 *order, u64 *snap_size) | |
3486 | { | |
3487 | __le64 snapid = cpu_to_le64(snap_id); | |
3488 | int ret; | |
3489 | struct { | |
3490 | u8 order; | |
3491 | __le64 size; | |
3492 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3493 | ||
36be9a76 | 3494 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3495 | "rbd", "get_size", |
4157976b | 3496 | &snapid, sizeof (snapid), |
e2a58ee5 | 3497 | &size_buf, sizeof (size_buf)); |
36be9a76 | 3498 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3499 | if (ret < 0) |
3500 | return ret; | |
57385b51 AE |
3501 | if (ret < sizeof (size_buf)) |
3502 | return -ERANGE; | |
9d475de5 | 3503 | |
c86f86e9 AE |
3504 | if (order) |
3505 | *order = size_buf.order; | |
9d475de5 AE |
3506 | *snap_size = le64_to_cpu(size_buf.size); |
3507 | ||
3508 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
57385b51 AE |
3509 | (unsigned long long)snap_id, (unsigned int)*order, |
3510 | (unsigned long long)*snap_size); | |
9d475de5 AE |
3511 | |
3512 | return 0; | |
3513 | } | |
3514 | ||
3515 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3516 | { | |
3517 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3518 | &rbd_dev->header.obj_order, | |
3519 | &rbd_dev->header.image_size); | |
3520 | } | |
3521 | ||
1e130199 AE |
3522 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3523 | { | |
3524 | void *reply_buf; | |
3525 | int ret; | |
3526 | void *p; | |
3527 | ||
3528 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3529 | if (!reply_buf) | |
3530 | return -ENOMEM; | |
3531 | ||
36be9a76 | 3532 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3533 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 3534 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 3535 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3536 | if (ret < 0) |
3537 | goto out; | |
3538 | ||
3539 | p = reply_buf; | |
3540 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3541 | p + ret, NULL, GFP_NOIO); |
3542 | ret = 0; | |
1e130199 AE |
3543 | |
3544 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3545 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3546 | rbd_dev->header.object_prefix = NULL; | |
3547 | } else { | |
3548 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3549 | } | |
1e130199 AE |
3550 | out: |
3551 | kfree(reply_buf); | |
3552 | ||
3553 | return ret; | |
3554 | } | |
3555 | ||
b1b5402a AE |
3556 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3557 | u64 *snap_features) | |
3558 | { | |
3559 | __le64 snapid = cpu_to_le64(snap_id); | |
3560 | struct { | |
3561 | __le64 features; | |
3562 | __le64 incompat; | |
4157976b | 3563 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3564 | u64 incompat; |
b1b5402a AE |
3565 | int ret; |
3566 | ||
36be9a76 | 3567 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3568 | "rbd", "get_features", |
4157976b | 3569 | &snapid, sizeof (snapid), |
e2a58ee5 | 3570 | &features_buf, sizeof (features_buf)); |
36be9a76 | 3571 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3572 | if (ret < 0) |
3573 | return ret; | |
57385b51 AE |
3574 | if (ret < sizeof (features_buf)) |
3575 | return -ERANGE; | |
d889140c AE |
3576 | |
3577 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3578 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3579 | return -ENXIO; |
d889140c | 3580 | |
b1b5402a AE |
3581 | *snap_features = le64_to_cpu(features_buf.features); |
3582 | ||
3583 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
3584 | (unsigned long long)snap_id, |
3585 | (unsigned long long)*snap_features, | |
3586 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
3587 | |
3588 | return 0; | |
3589 | } | |
3590 | ||
3591 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3592 | { | |
3593 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3594 | &rbd_dev->header.features); | |
3595 | } | |
3596 | ||
86b00e0d AE |
3597 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3598 | { | |
3599 | struct rbd_spec *parent_spec; | |
3600 | size_t size; | |
3601 | void *reply_buf = NULL; | |
3602 | __le64 snapid; | |
3603 | void *p; | |
3604 | void *end; | |
3605 | char *image_id; | |
3606 | u64 overlap; | |
86b00e0d AE |
3607 | int ret; |
3608 | ||
3609 | parent_spec = rbd_spec_alloc(); | |
3610 | if (!parent_spec) | |
3611 | return -ENOMEM; | |
3612 | ||
3613 | size = sizeof (__le64) + /* pool_id */ | |
3614 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3615 | sizeof (__le64) + /* snap_id */ | |
3616 | sizeof (__le64); /* overlap */ | |
3617 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3618 | if (!reply_buf) { | |
3619 | ret = -ENOMEM; | |
3620 | goto out_err; | |
3621 | } | |
3622 | ||
3623 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3624 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 3625 | "rbd", "get_parent", |
4157976b | 3626 | &snapid, sizeof (snapid), |
e2a58ee5 | 3627 | reply_buf, size); |
36be9a76 | 3628 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3629 | if (ret < 0) |
3630 | goto out_err; | |
3631 | ||
86b00e0d | 3632 | p = reply_buf; |
57385b51 AE |
3633 | end = reply_buf + ret; |
3634 | ret = -ERANGE; | |
86b00e0d AE |
3635 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
3636 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3637 | goto out; /* No parent? No problem. */ | |
3638 | ||
0903e875 AE |
3639 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3640 | ||
3641 | ret = -EIO; | |
c0cd10db AE |
3642 | if (parent_spec->pool_id > (u64)U32_MAX) { |
3643 | rbd_warn(NULL, "parent pool id too large (%llu > %u)\n", | |
3644 | (unsigned long long)parent_spec->pool_id, U32_MAX); | |
57385b51 | 3645 | goto out_err; |
c0cd10db | 3646 | } |
0903e875 | 3647 | |
979ed480 | 3648 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3649 | if (IS_ERR(image_id)) { |
3650 | ret = PTR_ERR(image_id); | |
3651 | goto out_err; | |
3652 | } | |
3653 | parent_spec->image_id = image_id; | |
3654 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3655 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3656 | ||
3657 | rbd_dev->parent_overlap = overlap; | |
3658 | rbd_dev->parent_spec = parent_spec; | |
3659 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3660 | out: | |
3661 | ret = 0; | |
3662 | out_err: | |
3663 | kfree(reply_buf); | |
3664 | rbd_spec_put(parent_spec); | |
3665 | ||
3666 | return ret; | |
3667 | } | |
3668 | ||
cc070d59 AE |
3669 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
3670 | { | |
3671 | struct { | |
3672 | __le64 stripe_unit; | |
3673 | __le64 stripe_count; | |
3674 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
3675 | size_t size = sizeof (striping_info_buf); | |
3676 | void *p; | |
3677 | u64 obj_size; | |
3678 | u64 stripe_unit; | |
3679 | u64 stripe_count; | |
3680 | int ret; | |
3681 | ||
3682 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
3683 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 3684 | (char *)&striping_info_buf, size); |
cc070d59 AE |
3685 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3686 | if (ret < 0) | |
3687 | return ret; | |
3688 | if (ret < size) | |
3689 | return -ERANGE; | |
3690 | ||
3691 | /* | |
3692 | * We don't actually support the "fancy striping" feature | |
3693 | * (STRIPINGV2) yet, but if the striping sizes are the | |
3694 | * defaults the behavior is the same as before. So find | |
3695 | * out, and only fail if the image has non-default values. | |
3696 | */ | |
3697 | ret = -EINVAL; | |
3698 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
3699 | p = &striping_info_buf; | |
3700 | stripe_unit = ceph_decode_64(&p); | |
3701 | if (stripe_unit != obj_size) { | |
3702 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
3703 | "(got %llu want %llu)", | |
3704 | stripe_unit, obj_size); | |
3705 | return -EINVAL; | |
3706 | } | |
3707 | stripe_count = ceph_decode_64(&p); | |
3708 | if (stripe_count != 1) { | |
3709 | rbd_warn(rbd_dev, "unsupported stripe count " | |
3710 | "(got %llu want 1)", stripe_count); | |
3711 | return -EINVAL; | |
3712 | } | |
500d0c0f AE |
3713 | rbd_dev->header.stripe_unit = stripe_unit; |
3714 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
3715 | |
3716 | return 0; | |
3717 | } | |
3718 | ||
9e15b77d AE |
3719 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3720 | { | |
3721 | size_t image_id_size; | |
3722 | char *image_id; | |
3723 | void *p; | |
3724 | void *end; | |
3725 | size_t size; | |
3726 | void *reply_buf = NULL; | |
3727 | size_t len = 0; | |
3728 | char *image_name = NULL; | |
3729 | int ret; | |
3730 | ||
3731 | rbd_assert(!rbd_dev->spec->image_name); | |
3732 | ||
69e7a02f AE |
3733 | len = strlen(rbd_dev->spec->image_id); |
3734 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3735 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3736 | if (!image_id) | |
3737 | return NULL; | |
3738 | ||
3739 | p = image_id; | |
4157976b | 3740 | end = image_id + image_id_size; |
57385b51 | 3741 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
3742 | |
3743 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3744 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3745 | if (!reply_buf) | |
3746 | goto out; | |
3747 | ||
36be9a76 | 3748 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3749 | "rbd", "dir_get_name", |
3750 | image_id, image_id_size, | |
e2a58ee5 | 3751 | reply_buf, size); |
9e15b77d AE |
3752 | if (ret < 0) |
3753 | goto out; | |
3754 | p = reply_buf; | |
f40eb349 AE |
3755 | end = reply_buf + ret; |
3756 | ||
9e15b77d AE |
3757 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3758 | if (IS_ERR(image_name)) | |
3759 | image_name = NULL; | |
3760 | else | |
3761 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3762 | out: | |
3763 | kfree(reply_buf); | |
3764 | kfree(image_id); | |
3765 | ||
3766 | return image_name; | |
3767 | } | |
3768 | ||
3769 | /* | |
2e9f7f1c AE |
3770 | * When an rbd image has a parent image, it is identified by the |
3771 | * pool, image, and snapshot ids (not names). This function fills | |
3772 | * in the names for those ids. (It's OK if we can't figure out the | |
3773 | * name for an image id, but the pool and snapshot ids should always | |
3774 | * exist and have names.) All names in an rbd spec are dynamically | |
3775 | * allocated. | |
e1d4213f AE |
3776 | * |
3777 | * When an image being mapped (not a parent) is probed, we have the | |
3778 | * pool name and pool id, image name and image id, and the snapshot | |
3779 | * name. The only thing we're missing is the snapshot id. | |
2e9f7f1c AE |
3780 | * |
3781 | * The set of snapshots for an image is not known until they have | |
3782 | * been read by rbd_dev_snaps_update(), so we can't completely fill | |
3783 | * in this information until after that has been called. | |
9e15b77d | 3784 | */ |
2e9f7f1c | 3785 | static int rbd_dev_spec_update(struct rbd_device *rbd_dev) |
9e15b77d | 3786 | { |
2e9f7f1c AE |
3787 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3788 | struct rbd_spec *spec = rbd_dev->spec; | |
3789 | const char *pool_name; | |
3790 | const char *image_name; | |
3791 | const char *snap_name; | |
9e15b77d AE |
3792 | int ret; |
3793 | ||
e1d4213f AE |
3794 | /* |
3795 | * An image being mapped will have the pool name (etc.), but | |
3796 | * we need to look up the snapshot id. | |
3797 | */ | |
2e9f7f1c AE |
3798 | if (spec->pool_name) { |
3799 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
e1d4213f AE |
3800 | struct rbd_snap *snap; |
3801 | ||
2e9f7f1c | 3802 | snap = snap_by_name(rbd_dev, spec->snap_name); |
e1d4213f AE |
3803 | if (!snap) |
3804 | return -ENOENT; | |
2e9f7f1c | 3805 | spec->snap_id = snap->id; |
e1d4213f | 3806 | } else { |
2e9f7f1c | 3807 | spec->snap_id = CEPH_NOSNAP; |
e1d4213f AE |
3808 | } |
3809 | ||
3810 | return 0; | |
3811 | } | |
9e15b77d | 3812 | |
2e9f7f1c | 3813 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 3814 | |
2e9f7f1c AE |
3815 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
3816 | if (!pool_name) { | |
3817 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
3818 | return -EIO; |
3819 | } | |
2e9f7f1c AE |
3820 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
3821 | if (!pool_name) | |
9e15b77d AE |
3822 | return -ENOMEM; |
3823 | ||
3824 | /* Fetch the image name; tolerate failure here */ | |
3825 | ||
2e9f7f1c AE |
3826 | image_name = rbd_dev_image_name(rbd_dev); |
3827 | if (!image_name) | |
06ecc6cb | 3828 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 3829 | |
2e9f7f1c | 3830 | /* Look up the snapshot name, and make a copy */ |
9e15b77d | 3831 | |
2e9f7f1c | 3832 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
2e9f7f1c AE |
3833 | if (!snap_name) { |
3834 | ret = -ENOMEM; | |
9e15b77d | 3835 | goto out_err; |
2e9f7f1c AE |
3836 | } |
3837 | ||
3838 | spec->pool_name = pool_name; | |
3839 | spec->image_name = image_name; | |
3840 | spec->snap_name = snap_name; | |
9e15b77d AE |
3841 | |
3842 | return 0; | |
3843 | out_err: | |
2e9f7f1c AE |
3844 | kfree(image_name); |
3845 | kfree(pool_name); | |
9e15b77d AE |
3846 | |
3847 | return ret; | |
3848 | } | |
3849 | ||
cc4a38bd | 3850 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
3851 | { |
3852 | size_t size; | |
3853 | int ret; | |
3854 | void *reply_buf; | |
3855 | void *p; | |
3856 | void *end; | |
3857 | u64 seq; | |
3858 | u32 snap_count; | |
3859 | struct ceph_snap_context *snapc; | |
3860 | u32 i; | |
3861 | ||
3862 | /* | |
3863 | * We'll need room for the seq value (maximum snapshot id), | |
3864 | * snapshot count, and array of that many snapshot ids. | |
3865 | * For now we have a fixed upper limit on the number we're | |
3866 | * prepared to receive. | |
3867 | */ | |
3868 | size = sizeof (__le64) + sizeof (__le32) + | |
3869 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3870 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3871 | if (!reply_buf) | |
3872 | return -ENOMEM; | |
3873 | ||
36be9a76 | 3874 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3875 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 3876 | reply_buf, size); |
36be9a76 | 3877 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3878 | if (ret < 0) |
3879 | goto out; | |
3880 | ||
35d489f9 | 3881 | p = reply_buf; |
57385b51 AE |
3882 | end = reply_buf + ret; |
3883 | ret = -ERANGE; | |
35d489f9 AE |
3884 | ceph_decode_64_safe(&p, end, seq, out); |
3885 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3886 | ||
3887 | /* | |
3888 | * Make sure the reported number of snapshot ids wouldn't go | |
3889 | * beyond the end of our buffer. But before checking that, | |
3890 | * make sure the computed size of the snapshot context we | |
3891 | * allocate is representable in a size_t. | |
3892 | */ | |
3893 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3894 | / sizeof (u64)) { | |
3895 | ret = -EINVAL; | |
3896 | goto out; | |
3897 | } | |
3898 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3899 | goto out; | |
468521c1 | 3900 | ret = 0; |
35d489f9 | 3901 | |
812164f8 | 3902 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
3903 | if (!snapc) { |
3904 | ret = -ENOMEM; | |
3905 | goto out; | |
3906 | } | |
35d489f9 | 3907 | snapc->seq = seq; |
35d489f9 AE |
3908 | for (i = 0; i < snap_count; i++) |
3909 | snapc->snaps[i] = ceph_decode_64(&p); | |
3910 | ||
3911 | rbd_dev->header.snapc = snapc; | |
3912 | ||
3913 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 3914 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
3915 | out: |
3916 | kfree(reply_buf); | |
3917 | ||
57385b51 | 3918 | return ret; |
35d489f9 AE |
3919 | } |
3920 | ||
54cac61f AE |
3921 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
3922 | u64 snap_id) | |
b8b1e2db AE |
3923 | { |
3924 | size_t size; | |
3925 | void *reply_buf; | |
54cac61f | 3926 | __le64 snapid; |
b8b1e2db AE |
3927 | int ret; |
3928 | void *p; | |
3929 | void *end; | |
b8b1e2db AE |
3930 | char *snap_name; |
3931 | ||
3932 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
3933 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3934 | if (!reply_buf) | |
3935 | return ERR_PTR(-ENOMEM); | |
3936 | ||
54cac61f | 3937 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 3938 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 3939 | "rbd", "get_snapshot_name", |
54cac61f | 3940 | &snapid, sizeof (snapid), |
e2a58ee5 | 3941 | reply_buf, size); |
36be9a76 | 3942 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
3943 | if (ret < 0) { |
3944 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 3945 | goto out; |
f40eb349 | 3946 | } |
b8b1e2db AE |
3947 | |
3948 | p = reply_buf; | |
f40eb349 | 3949 | end = reply_buf + ret; |
e5c35534 | 3950 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 3951 | if (IS_ERR(snap_name)) |
b8b1e2db | 3952 | goto out; |
b8b1e2db | 3953 | |
f40eb349 | 3954 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 3955 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
3956 | out: |
3957 | kfree(reply_buf); | |
3958 | ||
f40eb349 | 3959 | return snap_name; |
b8b1e2db AE |
3960 | } |
3961 | ||
54cac61f AE |
3962 | static const char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, |
3963 | u64 snap_id, u64 *snap_size, u64 *snap_features) | |
b8b1e2db | 3964 | { |
acb1b6ca AE |
3965 | u64 size; |
3966 | u64 features; | |
cb75223d | 3967 | const char *snap_name; |
b8b1e2db AE |
3968 | int ret; |
3969 | ||
acb1b6ca | 3970 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
b8b1e2db | 3971 | if (ret) |
acb1b6ca AE |
3972 | goto out_err; |
3973 | ||
3974 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); | |
b8b1e2db | 3975 | if (ret) |
acb1b6ca AE |
3976 | goto out_err; |
3977 | ||
54cac61f | 3978 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); |
acb1b6ca AE |
3979 | if (!IS_ERR(snap_name)) { |
3980 | *snap_size = size; | |
3981 | *snap_features = features; | |
3982 | } | |
b8b1e2db | 3983 | |
acb1b6ca AE |
3984 | return snap_name; |
3985 | out_err: | |
3986 | return ERR_PTR(ret); | |
b8b1e2db AE |
3987 | } |
3988 | ||
54cac61f AE |
3989 | static const char *rbd_dev_snap_info(struct rbd_device *rbd_dev, |
3990 | u64 snap_id, u64 *snap_size, u64 *snap_features) | |
b8b1e2db AE |
3991 | { |
3992 | if (rbd_dev->image_format == 1) | |
54cac61f | 3993 | return rbd_dev_v1_snap_info(rbd_dev, snap_id, |
b8b1e2db AE |
3994 | snap_size, snap_features); |
3995 | if (rbd_dev->image_format == 2) | |
54cac61f | 3996 | return rbd_dev_v2_snap_info(rbd_dev, snap_id, |
b8b1e2db AE |
3997 | snap_size, snap_features); |
3998 | return ERR_PTR(-EINVAL); | |
3999 | } | |
4000 | ||
cc4a38bd | 4001 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev) |
117973fb AE |
4002 | { |
4003 | int ret; | |
117973fb AE |
4004 | |
4005 | down_write(&rbd_dev->header_rwsem); | |
4006 | ||
117973fb AE |
4007 | ret = rbd_dev_v2_image_size(rbd_dev); |
4008 | if (ret) | |
4009 | goto out; | |
117973fb AE |
4010 | rbd_update_mapping_size(rbd_dev); |
4011 | ||
cc4a38bd | 4012 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb AE |
4013 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
4014 | if (ret) | |
4015 | goto out; | |
4016 | ret = rbd_dev_snaps_update(rbd_dev); | |
4017 | dout("rbd_dev_snaps_update returned %d\n", ret); | |
4018 | if (ret) | |
4019 | goto out; | |
117973fb AE |
4020 | out: |
4021 | up_write(&rbd_dev->header_rwsem); | |
4022 | ||
4023 | return ret; | |
4024 | } | |
4025 | ||
dfc5606d | 4026 | /* |
35938150 AE |
4027 | * Scan the rbd device's current snapshot list and compare it to the |
4028 | * newly-received snapshot context. Remove any existing snapshots | |
4029 | * not present in the new snapshot context. Add a new snapshot for | |
4030 | * any snaphots in the snapshot context not in the current list. | |
4031 | * And verify there are no changes to snapshots we already know | |
4032 | * about. | |
4033 | * | |
4034 | * Assumes the snapshots in the snapshot context are sorted by | |
4035 | * snapshot id, highest id first. (Snapshots in the rbd_dev's list | |
4036 | * are also maintained in that order.) | |
522a0cc0 AE |
4037 | * |
4038 | * Note that any error occurs while updating the snapshot list | |
4039 | * aborts the update, and the entire list is cleared. The snapshot | |
4040 | * list becomes inconsistent at that point anyway, so it might as | |
4041 | * well be empty. | |
dfc5606d | 4042 | */ |
304f6808 | 4043 | static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
dfc5606d | 4044 | { |
35938150 AE |
4045 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
4046 | const u32 snap_count = snapc->num_snaps; | |
35938150 AE |
4047 | struct list_head *head = &rbd_dev->snaps; |
4048 | struct list_head *links = head->next; | |
4049 | u32 index = 0; | |
522a0cc0 | 4050 | int ret = 0; |
dfc5606d | 4051 | |
522a0cc0 | 4052 | dout("%s: snap count is %u\n", __func__, (unsigned int)snap_count); |
35938150 AE |
4053 | while (index < snap_count || links != head) { |
4054 | u64 snap_id; | |
4055 | struct rbd_snap *snap; | |
cb75223d | 4056 | const char *snap_name; |
cd892126 AE |
4057 | u64 snap_size = 0; |
4058 | u64 snap_features = 0; | |
dfc5606d | 4059 | |
35938150 AE |
4060 | snap_id = index < snap_count ? snapc->snaps[index] |
4061 | : CEPH_NOSNAP; | |
4062 | snap = links != head ? list_entry(links, struct rbd_snap, node) | |
4063 | : NULL; | |
aafb230e | 4064 | rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
dfc5606d | 4065 | |
35938150 AE |
4066 | if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
4067 | struct list_head *next = links->next; | |
dfc5606d | 4068 | |
6d292906 AE |
4069 | /* |
4070 | * A previously-existing snapshot is not in | |
4071 | * the new snap context. | |
4072 | * | |
522a0cc0 AE |
4073 | * If the now-missing snapshot is the one |
4074 | * the image represents, clear its existence | |
4075 | * flag so we can avoid sending any more | |
4076 | * requests to it. | |
6d292906 | 4077 | */ |
0d7dbfce | 4078 | if (rbd_dev->spec->snap_id == snap->id) |
6d292906 | 4079 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
3e83b65b | 4080 | dout("removing %ssnap id %llu\n", |
0d7dbfce AE |
4081 | rbd_dev->spec->snap_id == snap->id ? |
4082 | "mapped " : "", | |
522a0cc0 | 4083 | (unsigned long long)snap->id); |
6087b51b AE |
4084 | |
4085 | list_del(&snap->node); | |
4086 | rbd_snap_destroy(snap); | |
35938150 AE |
4087 | |
4088 | /* Done with this list entry; advance */ | |
4089 | ||
4090 | links = next; | |
dfc5606d YS |
4091 | continue; |
4092 | } | |
35938150 | 4093 | |
54cac61f | 4094 | snap_name = rbd_dev_snap_info(rbd_dev, snap_id, |
b8b1e2db | 4095 | &snap_size, &snap_features); |
522a0cc0 AE |
4096 | if (IS_ERR(snap_name)) { |
4097 | ret = PTR_ERR(snap_name); | |
4098 | dout("failed to get snap info, error %d\n", ret); | |
4099 | goto out_err; | |
4100 | } | |
cd892126 | 4101 | |
522a0cc0 AE |
4102 | dout("entry %u: snap_id = %llu\n", (unsigned int)snap_count, |
4103 | (unsigned long long)snap_id); | |
35938150 AE |
4104 | if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
4105 | struct rbd_snap *new_snap; | |
4106 | ||
4107 | /* We haven't seen this snapshot before */ | |
4108 | ||
6087b51b | 4109 | new_snap = rbd_snap_create(rbd_dev, snap_name, |
cd892126 | 4110 | snap_id, snap_size, snap_features); |
9fcbb800 | 4111 | if (IS_ERR(new_snap)) { |
522a0cc0 AE |
4112 | ret = PTR_ERR(new_snap); |
4113 | dout(" failed to add dev, error %d\n", ret); | |
4114 | goto out_err; | |
9fcbb800 | 4115 | } |
35938150 AE |
4116 | |
4117 | /* New goes before existing, or at end of list */ | |
4118 | ||
9fcbb800 | 4119 | dout(" added dev%s\n", snap ? "" : " at end\n"); |
35938150 AE |
4120 | if (snap) |
4121 | list_add_tail(&new_snap->node, &snap->node); | |
4122 | else | |
523f3258 | 4123 | list_add_tail(&new_snap->node, head); |
35938150 AE |
4124 | } else { |
4125 | /* Already have this one */ | |
4126 | ||
9fcbb800 AE |
4127 | dout(" already present\n"); |
4128 | ||
cd892126 | 4129 | rbd_assert(snap->size == snap_size); |
aafb230e | 4130 | rbd_assert(!strcmp(snap->name, snap_name)); |
cd892126 | 4131 | rbd_assert(snap->features == snap_features); |
35938150 AE |
4132 | |
4133 | /* Done with this list entry; advance */ | |
4134 | ||
4135 | links = links->next; | |
dfc5606d | 4136 | } |
35938150 AE |
4137 | |
4138 | /* Advance to the next entry in the snapshot context */ | |
4139 | ||
4140 | index++; | |
dfc5606d | 4141 | } |
9fcbb800 | 4142 | dout("%s: done\n", __func__); |
dfc5606d YS |
4143 | |
4144 | return 0; | |
522a0cc0 AE |
4145 | out_err: |
4146 | rbd_remove_all_snaps(rbd_dev); | |
4147 | ||
4148 | return ret; | |
dfc5606d YS |
4149 | } |
4150 | ||
dfc5606d YS |
4151 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4152 | { | |
dfc5606d | 4153 | struct device *dev; |
cd789ab9 | 4154 | int ret; |
dfc5606d YS |
4155 | |
4156 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4157 | |
cd789ab9 | 4158 | dev = &rbd_dev->dev; |
dfc5606d YS |
4159 | dev->bus = &rbd_bus_type; |
4160 | dev->type = &rbd_device_type; | |
4161 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4162 | dev->release = rbd_dev_device_release; |
de71a297 | 4163 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4164 | ret = device_register(dev); |
dfc5606d | 4165 | |
dfc5606d | 4166 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4167 | |
dfc5606d | 4168 | return ret; |
602adf40 YS |
4169 | } |
4170 | ||
dfc5606d YS |
4171 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4172 | { | |
4173 | device_unregister(&rbd_dev->dev); | |
4174 | } | |
4175 | ||
e2839308 | 4176 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4177 | |
4178 | /* | |
499afd5b AE |
4179 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4180 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4181 | */ |
e2839308 | 4182 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4183 | { |
e2839308 | 4184 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4185 | |
4186 | spin_lock(&rbd_dev_list_lock); | |
4187 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4188 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4189 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4190 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4191 | } |
b7f23c36 | 4192 | |
1ddbe94e | 4193 | /* |
499afd5b AE |
4194 | * Remove an rbd_dev from the global list, and record that its |
4195 | * identifier is no longer in use. | |
1ddbe94e | 4196 | */ |
e2839308 | 4197 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4198 | { |
d184f6bf | 4199 | struct list_head *tmp; |
de71a297 | 4200 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4201 | int max_id; |
4202 | ||
aafb230e | 4203 | rbd_assert(rbd_id > 0); |
499afd5b | 4204 | |
e2839308 AE |
4205 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4206 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4207 | spin_lock(&rbd_dev_list_lock); |
4208 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4209 | |
4210 | /* | |
4211 | * If the id being "put" is not the current maximum, there | |
4212 | * is nothing special we need to do. | |
4213 | */ | |
e2839308 | 4214 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4215 | spin_unlock(&rbd_dev_list_lock); |
4216 | return; | |
4217 | } | |
4218 | ||
4219 | /* | |
4220 | * We need to update the current maximum id. Search the | |
4221 | * list to find out what it is. We're more likely to find | |
4222 | * the maximum at the end, so search the list backward. | |
4223 | */ | |
4224 | max_id = 0; | |
4225 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4226 | struct rbd_device *rbd_dev; | |
4227 | ||
4228 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4229 | if (rbd_dev->dev_id > max_id) |
4230 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4231 | } |
499afd5b | 4232 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4233 | |
1ddbe94e | 4234 | /* |
e2839308 | 4235 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4236 | * which case it now accurately reflects the new maximum. |
4237 | * Be careful not to overwrite the maximum value in that | |
4238 | * case. | |
1ddbe94e | 4239 | */ |
e2839308 AE |
4240 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4241 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4242 | } |
4243 | ||
e28fff26 AE |
4244 | /* |
4245 | * Skips over white space at *buf, and updates *buf to point to the | |
4246 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4247 | * the token (string of non-white space characters) found. Note |
4248 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4249 | */ |
4250 | static inline size_t next_token(const char **buf) | |
4251 | { | |
4252 | /* | |
4253 | * These are the characters that produce nonzero for | |
4254 | * isspace() in the "C" and "POSIX" locales. | |
4255 | */ | |
4256 | const char *spaces = " \f\n\r\t\v"; | |
4257 | ||
4258 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4259 | ||
4260 | return strcspn(*buf, spaces); /* Return token length */ | |
4261 | } | |
4262 | ||
4263 | /* | |
4264 | * Finds the next token in *buf, and if the provided token buffer is | |
4265 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4266 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4267 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4268 | * |
4269 | * Returns the length of the token found (not including the '\0'). | |
4270 | * Return value will be 0 if no token is found, and it will be >= | |
4271 | * token_size if the token would not fit. | |
4272 | * | |
593a9e7b | 4273 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4274 | * found token. Note that this occurs even if the token buffer is |
4275 | * too small to hold it. | |
4276 | */ | |
4277 | static inline size_t copy_token(const char **buf, | |
4278 | char *token, | |
4279 | size_t token_size) | |
4280 | { | |
4281 | size_t len; | |
4282 | ||
4283 | len = next_token(buf); | |
4284 | if (len < token_size) { | |
4285 | memcpy(token, *buf, len); | |
4286 | *(token + len) = '\0'; | |
4287 | } | |
4288 | *buf += len; | |
4289 | ||
4290 | return len; | |
4291 | } | |
4292 | ||
ea3352f4 AE |
4293 | /* |
4294 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4295 | * enough to hold a copy of it, and copies the token into the new | |
4296 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4297 | * that a duplicate buffer is created even for a zero-length token. | |
4298 | * | |
4299 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4300 | * pointer if memory for the duplicate was not available. If | |
4301 | * the lenp argument is a non-null pointer, the length of the token | |
4302 | * (not including the '\0') is returned in *lenp. | |
4303 | * | |
4304 | * If successful, the *buf pointer will be updated to point beyond | |
4305 | * the end of the found token. | |
4306 | * | |
4307 | * Note: uses GFP_KERNEL for allocation. | |
4308 | */ | |
4309 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4310 | { | |
4311 | char *dup; | |
4312 | size_t len; | |
4313 | ||
4314 | len = next_token(buf); | |
4caf35f9 | 4315 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4316 | if (!dup) |
4317 | return NULL; | |
ea3352f4 AE |
4318 | *(dup + len) = '\0'; |
4319 | *buf += len; | |
4320 | ||
4321 | if (lenp) | |
4322 | *lenp = len; | |
4323 | ||
4324 | return dup; | |
4325 | } | |
4326 | ||
a725f65e | 4327 | /* |
859c31df AE |
4328 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4329 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4330 | * and the data written is passed here via a NUL-terminated buffer. | |
4331 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4332 | * |
859c31df AE |
4333 | * The information extracted from these options is recorded in |
4334 | * the other parameters which return dynamically-allocated | |
4335 | * structures: | |
4336 | * ceph_opts | |
4337 | * The address of a pointer that will refer to a ceph options | |
4338 | * structure. Caller must release the returned pointer using | |
4339 | * ceph_destroy_options() when it is no longer needed. | |
4340 | * rbd_opts | |
4341 | * Address of an rbd options pointer. Fully initialized by | |
4342 | * this function; caller must release with kfree(). | |
4343 | * spec | |
4344 | * Address of an rbd image specification pointer. Fully | |
4345 | * initialized by this function based on parsed options. | |
4346 | * Caller must release with rbd_spec_put(). | |
4347 | * | |
4348 | * The options passed take this form: | |
4349 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4350 | * where: | |
4351 | * <mon_addrs> | |
4352 | * A comma-separated list of one or more monitor addresses. | |
4353 | * A monitor address is an ip address, optionally followed | |
4354 | * by a port number (separated by a colon). | |
4355 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4356 | * <options> | |
4357 | * A comma-separated list of ceph and/or rbd options. | |
4358 | * <pool_name> | |
4359 | * The name of the rados pool containing the rbd image. | |
4360 | * <image_name> | |
4361 | * The name of the image in that pool to map. | |
4362 | * <snap_id> | |
4363 | * An optional snapshot id. If provided, the mapping will | |
4364 | * present data from the image at the time that snapshot was | |
4365 | * created. The image head is used if no snapshot id is | |
4366 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4367 | */ |
859c31df | 4368 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4369 | struct ceph_options **ceph_opts, |
859c31df AE |
4370 | struct rbd_options **opts, |
4371 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4372 | { |
d22f76e7 | 4373 | size_t len; |
859c31df | 4374 | char *options; |
0ddebc0c | 4375 | const char *mon_addrs; |
ecb4dc22 | 4376 | char *snap_name; |
0ddebc0c | 4377 | size_t mon_addrs_size; |
859c31df | 4378 | struct rbd_spec *spec = NULL; |
4e9afeba | 4379 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4380 | struct ceph_options *copts; |
dc79b113 | 4381 | int ret; |
e28fff26 AE |
4382 | |
4383 | /* The first four tokens are required */ | |
4384 | ||
7ef3214a | 4385 | len = next_token(&buf); |
4fb5d671 AE |
4386 | if (!len) { |
4387 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4388 | return -EINVAL; | |
4389 | } | |
0ddebc0c | 4390 | mon_addrs = buf; |
f28e565a | 4391 | mon_addrs_size = len + 1; |
7ef3214a | 4392 | buf += len; |
a725f65e | 4393 | |
dc79b113 | 4394 | ret = -EINVAL; |
f28e565a AE |
4395 | options = dup_token(&buf, NULL); |
4396 | if (!options) | |
dc79b113 | 4397 | return -ENOMEM; |
4fb5d671 AE |
4398 | if (!*options) { |
4399 | rbd_warn(NULL, "no options provided"); | |
4400 | goto out_err; | |
4401 | } | |
e28fff26 | 4402 | |
859c31df AE |
4403 | spec = rbd_spec_alloc(); |
4404 | if (!spec) | |
f28e565a | 4405 | goto out_mem; |
859c31df AE |
4406 | |
4407 | spec->pool_name = dup_token(&buf, NULL); | |
4408 | if (!spec->pool_name) | |
4409 | goto out_mem; | |
4fb5d671 AE |
4410 | if (!*spec->pool_name) { |
4411 | rbd_warn(NULL, "no pool name provided"); | |
4412 | goto out_err; | |
4413 | } | |
e28fff26 | 4414 | |
69e7a02f | 4415 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4416 | if (!spec->image_name) |
f28e565a | 4417 | goto out_mem; |
4fb5d671 AE |
4418 | if (!*spec->image_name) { |
4419 | rbd_warn(NULL, "no image name provided"); | |
4420 | goto out_err; | |
4421 | } | |
d4b125e9 | 4422 | |
f28e565a AE |
4423 | /* |
4424 | * Snapshot name is optional; default is to use "-" | |
4425 | * (indicating the head/no snapshot). | |
4426 | */ | |
3feeb894 | 4427 | len = next_token(&buf); |
820a5f3e | 4428 | if (!len) { |
3feeb894 AE |
4429 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4430 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4431 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4432 | ret = -ENAMETOOLONG; |
f28e565a | 4433 | goto out_err; |
849b4260 | 4434 | } |
ecb4dc22 AE |
4435 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4436 | if (!snap_name) | |
f28e565a | 4437 | goto out_mem; |
ecb4dc22 AE |
4438 | *(snap_name + len) = '\0'; |
4439 | spec->snap_name = snap_name; | |
e5c35534 | 4440 | |
0ddebc0c | 4441 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4442 | |
4e9afeba AE |
4443 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4444 | if (!rbd_opts) | |
4445 | goto out_mem; | |
4446 | ||
4447 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4448 | |
859c31df | 4449 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4450 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4451 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4452 | if (IS_ERR(copts)) { |
4453 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4454 | goto out_err; |
4455 | } | |
859c31df AE |
4456 | kfree(options); |
4457 | ||
4458 | *ceph_opts = copts; | |
4e9afeba | 4459 | *opts = rbd_opts; |
859c31df | 4460 | *rbd_spec = spec; |
0ddebc0c | 4461 | |
dc79b113 | 4462 | return 0; |
f28e565a | 4463 | out_mem: |
dc79b113 | 4464 | ret = -ENOMEM; |
d22f76e7 | 4465 | out_err: |
859c31df AE |
4466 | kfree(rbd_opts); |
4467 | rbd_spec_put(spec); | |
f28e565a | 4468 | kfree(options); |
d22f76e7 | 4469 | |
dc79b113 | 4470 | return ret; |
a725f65e AE |
4471 | } |
4472 | ||
589d30e0 AE |
4473 | /* |
4474 | * An rbd format 2 image has a unique identifier, distinct from the | |
4475 | * name given to it by the user. Internally, that identifier is | |
4476 | * what's used to specify the names of objects related to the image. | |
4477 | * | |
4478 | * A special "rbd id" object is used to map an rbd image name to its | |
4479 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4480 | * with the supplied name. | |
4481 | * | |
4482 | * This function will record the given rbd_dev's image_id field if | |
4483 | * it can be determined, and in that case will return 0. If any | |
4484 | * errors occur a negative errno will be returned and the rbd_dev's | |
4485 | * image_id field will be unchanged (and should be NULL). | |
4486 | */ | |
4487 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4488 | { | |
4489 | int ret; | |
4490 | size_t size; | |
4491 | char *object_name; | |
4492 | void *response; | |
c0fba368 | 4493 | char *image_id; |
2f82ee54 | 4494 | |
2c0d0a10 AE |
4495 | /* |
4496 | * When probing a parent image, the image id is already | |
4497 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4498 | * need to fetch the image id again in this case. We |
4499 | * do still need to set the image format though. | |
2c0d0a10 | 4500 | */ |
c0fba368 AE |
4501 | if (rbd_dev->spec->image_id) { |
4502 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4503 | ||
2c0d0a10 | 4504 | return 0; |
c0fba368 | 4505 | } |
2c0d0a10 | 4506 | |
589d30e0 AE |
4507 | /* |
4508 | * First, see if the format 2 image id file exists, and if | |
4509 | * so, get the image's persistent id from it. | |
4510 | */ | |
69e7a02f | 4511 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4512 | object_name = kmalloc(size, GFP_NOIO); |
4513 | if (!object_name) | |
4514 | return -ENOMEM; | |
0d7dbfce | 4515 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4516 | dout("rbd id object name is %s\n", object_name); |
4517 | ||
4518 | /* Response will be an encoded string, which includes a length */ | |
4519 | ||
4520 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4521 | response = kzalloc(size, GFP_NOIO); | |
4522 | if (!response) { | |
4523 | ret = -ENOMEM; | |
4524 | goto out; | |
4525 | } | |
4526 | ||
c0fba368 AE |
4527 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4528 | ||
36be9a76 | 4529 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4530 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 4531 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 4532 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4533 | if (ret == -ENOENT) { |
4534 | image_id = kstrdup("", GFP_KERNEL); | |
4535 | ret = image_id ? 0 : -ENOMEM; | |
4536 | if (!ret) | |
4537 | rbd_dev->image_format = 1; | |
4538 | } else if (ret > sizeof (__le32)) { | |
4539 | void *p = response; | |
4540 | ||
4541 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4542 | NULL, GFP_NOIO); |
c0fba368 AE |
4543 | ret = IS_ERR(image_id) ? PTR_ERR(image_id) : 0; |
4544 | if (!ret) | |
4545 | rbd_dev->image_format = 2; | |
589d30e0 | 4546 | } else { |
c0fba368 AE |
4547 | ret = -EINVAL; |
4548 | } | |
4549 | ||
4550 | if (!ret) { | |
4551 | rbd_dev->spec->image_id = image_id; | |
4552 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4553 | } |
4554 | out: | |
4555 | kfree(response); | |
4556 | kfree(object_name); | |
4557 | ||
4558 | return ret; | |
4559 | } | |
4560 | ||
6fd48b3b AE |
4561 | /* Undo whatever state changes are made by v1 or v2 image probe */ |
4562 | ||
4563 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) | |
4564 | { | |
4565 | struct rbd_image_header *header; | |
4566 | ||
4567 | rbd_dev_remove_parent(rbd_dev); | |
4568 | rbd_spec_put(rbd_dev->parent_spec); | |
4569 | rbd_dev->parent_spec = NULL; | |
4570 | rbd_dev->parent_overlap = 0; | |
4571 | ||
4572 | /* Free dynamic fields from the header, then zero it out */ | |
4573 | ||
4574 | header = &rbd_dev->header; | |
812164f8 | 4575 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4576 | kfree(header->snap_sizes); |
4577 | kfree(header->snap_names); | |
4578 | kfree(header->object_prefix); | |
4579 | memset(header, 0, sizeof (*header)); | |
4580 | } | |
4581 | ||
a30b71b9 AE |
4582 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4583 | { | |
4584 | int ret; | |
a30b71b9 AE |
4585 | |
4586 | /* Populate rbd image metadata */ | |
4587 | ||
4588 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4589 | if (ret < 0) | |
4590 | goto out_err; | |
86b00e0d AE |
4591 | |
4592 | /* Version 1 images have no parent (no layering) */ | |
4593 | ||
4594 | rbd_dev->parent_spec = NULL; | |
4595 | rbd_dev->parent_overlap = 0; | |
4596 | ||
a30b71b9 AE |
4597 | dout("discovered version 1 image, header name is %s\n", |
4598 | rbd_dev->header_name); | |
4599 | ||
4600 | return 0; | |
4601 | ||
4602 | out_err: | |
4603 | kfree(rbd_dev->header_name); | |
4604 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4605 | kfree(rbd_dev->spec->image_id); |
4606 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4607 | |
4608 | return ret; | |
4609 | } | |
4610 | ||
4611 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4612 | { | |
9d475de5 | 4613 | int ret; |
a30b71b9 | 4614 | |
9d475de5 | 4615 | ret = rbd_dev_v2_image_size(rbd_dev); |
57385b51 | 4616 | if (ret) |
1e130199 AE |
4617 | goto out_err; |
4618 | ||
4619 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4620 | ||
4621 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
57385b51 | 4622 | if (ret) |
b1b5402a AE |
4623 | goto out_err; |
4624 | ||
d889140c | 4625 | /* Get the and check features for the image */ |
b1b5402a AE |
4626 | |
4627 | ret = rbd_dev_v2_features(rbd_dev); | |
57385b51 | 4628 | if (ret) |
9d475de5 | 4629 | goto out_err; |
35d489f9 | 4630 | |
86b00e0d AE |
4631 | /* If the image supports layering, get the parent info */ |
4632 | ||
4633 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4634 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
57385b51 | 4635 | if (ret) |
86b00e0d | 4636 | goto out_err; |
96882f55 AE |
4637 | |
4638 | /* | |
4639 | * Don't print a warning for parent images. We can | |
4640 | * tell this point because we won't know its pool | |
4641 | * name yet (just its pool id). | |
4642 | */ | |
4643 | if (rbd_dev->spec->pool_name) | |
4644 | rbd_warn(rbd_dev, "WARNING: kernel layering " | |
4645 | "is EXPERIMENTAL!"); | |
86b00e0d AE |
4646 | } |
4647 | ||
cc070d59 AE |
4648 | /* If the image supports fancy striping, get its parameters */ |
4649 | ||
4650 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4651 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4652 | if (ret < 0) | |
4653 | goto out_err; | |
4654 | } | |
4655 | ||
6e14b1a6 AE |
4656 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4657 | ||
4658 | rbd_dev->header.crypt_type = 0; | |
4659 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4660 | |
6e14b1a6 AE |
4661 | /* Get the snapshot context, plus the header version */ |
4662 | ||
cc4a38bd | 4663 | ret = rbd_dev_v2_snap_context(rbd_dev); |
35d489f9 AE |
4664 | if (ret) |
4665 | goto out_err; | |
6e14b1a6 | 4666 | |
a30b71b9 AE |
4667 | dout("discovered version 2 image, header name is %s\n", |
4668 | rbd_dev->header_name); | |
4669 | ||
35152979 | 4670 | return 0; |
9d475de5 | 4671 | out_err: |
86b00e0d AE |
4672 | rbd_dev->parent_overlap = 0; |
4673 | rbd_spec_put(rbd_dev->parent_spec); | |
4674 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4675 | kfree(rbd_dev->header_name); |
4676 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4677 | kfree(rbd_dev->header.object_prefix); |
4678 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4679 | |
4680 | return ret; | |
a30b71b9 AE |
4681 | } |
4682 | ||
124afba2 | 4683 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 4684 | { |
2f82ee54 | 4685 | struct rbd_device *parent = NULL; |
124afba2 AE |
4686 | struct rbd_spec *parent_spec; |
4687 | struct rbd_client *rbdc; | |
4688 | int ret; | |
4689 | ||
4690 | if (!rbd_dev->parent_spec) | |
4691 | return 0; | |
4692 | /* | |
4693 | * We need to pass a reference to the client and the parent | |
4694 | * spec when creating the parent rbd_dev. Images related by | |
4695 | * parent/child relationships always share both. | |
4696 | */ | |
4697 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4698 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4699 | ||
4700 | ret = -ENOMEM; | |
4701 | parent = rbd_dev_create(rbdc, parent_spec); | |
4702 | if (!parent) | |
4703 | goto out_err; | |
4704 | ||
4705 | ret = rbd_dev_image_probe(parent); | |
4706 | if (ret < 0) | |
4707 | goto out_err; | |
4708 | rbd_dev->parent = parent; | |
4709 | ||
4710 | return 0; | |
4711 | out_err: | |
4712 | if (parent) { | |
4713 | rbd_spec_put(rbd_dev->parent_spec); | |
4714 | kfree(rbd_dev->header_name); | |
4715 | rbd_dev_destroy(parent); | |
4716 | } else { | |
4717 | rbd_put_client(rbdc); | |
4718 | rbd_spec_put(parent_spec); | |
4719 | } | |
4720 | ||
4721 | return ret; | |
4722 | } | |
4723 | ||
200a6a8b | 4724 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 4725 | { |
83a06263 | 4726 | int ret; |
d1cf5788 AE |
4727 | |
4728 | ret = rbd_dev_mapping_set(rbd_dev); | |
83a06263 | 4729 | if (ret) |
9bb81c9b | 4730 | return ret; |
5de10f3b | 4731 | |
83a06263 AE |
4732 | /* generate unique id: find highest unique id, add one */ |
4733 | rbd_dev_id_get(rbd_dev); | |
4734 | ||
4735 | /* Fill in the device name, now that we have its id. */ | |
4736 | BUILD_BUG_ON(DEV_NAME_LEN | |
4737 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4738 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4739 | ||
4740 | /* Get our block major device number. */ | |
4741 | ||
4742 | ret = register_blkdev(0, rbd_dev->name); | |
4743 | if (ret < 0) | |
4744 | goto err_out_id; | |
4745 | rbd_dev->major = ret; | |
4746 | ||
4747 | /* Set up the blkdev mapping. */ | |
4748 | ||
4749 | ret = rbd_init_disk(rbd_dev); | |
4750 | if (ret) | |
4751 | goto err_out_blkdev; | |
4752 | ||
4753 | ret = rbd_bus_add_dev(rbd_dev); | |
4754 | if (ret) | |
4755 | goto err_out_disk; | |
4756 | ||
83a06263 AE |
4757 | /* Everything's ready. Announce the disk to the world. */ |
4758 | ||
b5156e76 | 4759 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
129b79d4 | 4760 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
4761 | add_disk(rbd_dev->disk); |
4762 | ||
4763 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4764 | (unsigned long long) rbd_dev->mapping.size); | |
4765 | ||
4766 | return ret; | |
2f82ee54 | 4767 | |
83a06263 AE |
4768 | err_out_disk: |
4769 | rbd_free_disk(rbd_dev); | |
4770 | err_out_blkdev: | |
4771 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4772 | err_out_id: | |
4773 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 4774 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
4775 | |
4776 | return ret; | |
4777 | } | |
4778 | ||
332bb12d AE |
4779 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
4780 | { | |
4781 | struct rbd_spec *spec = rbd_dev->spec; | |
4782 | size_t size; | |
4783 | ||
4784 | /* Record the header object name for this rbd image. */ | |
4785 | ||
4786 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4787 | ||
4788 | if (rbd_dev->image_format == 1) | |
4789 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
4790 | else | |
4791 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
4792 | ||
4793 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
4794 | if (!rbd_dev->header_name) | |
4795 | return -ENOMEM; | |
4796 | ||
4797 | if (rbd_dev->image_format == 1) | |
4798 | sprintf(rbd_dev->header_name, "%s%s", | |
4799 | spec->image_name, RBD_SUFFIX); | |
4800 | else | |
4801 | sprintf(rbd_dev->header_name, "%s%s", | |
4802 | RBD_HEADER_PREFIX, spec->image_id); | |
4803 | return 0; | |
4804 | } | |
4805 | ||
200a6a8b AE |
4806 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
4807 | { | |
6fd48b3b AE |
4808 | int ret; |
4809 | ||
4810 | rbd_remove_all_snaps(rbd_dev); | |
4811 | rbd_dev_unprobe(rbd_dev); | |
4812 | ret = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4813 | if (ret) | |
4814 | rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret); | |
200a6a8b | 4815 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
4816 | rbd_dev->header_name = NULL; |
4817 | rbd_dev->image_format = 0; | |
4818 | kfree(rbd_dev->spec->image_id); | |
4819 | rbd_dev->spec->image_id = NULL; | |
4820 | ||
200a6a8b AE |
4821 | rbd_dev_destroy(rbd_dev); |
4822 | } | |
4823 | ||
a30b71b9 AE |
4824 | /* |
4825 | * Probe for the existence of the header object for the given rbd | |
4826 | * device. For format 2 images this includes determining the image | |
4827 | * id. | |
4828 | */ | |
71f293e2 | 4829 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev) |
a30b71b9 AE |
4830 | { |
4831 | int ret; | |
b644de2b | 4832 | int tmp; |
a30b71b9 AE |
4833 | |
4834 | /* | |
4835 | * Get the id from the image id object. If it's not a | |
4836 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4837 | * it's a format 1 image. | |
4838 | */ | |
4839 | ret = rbd_dev_image_id(rbd_dev); | |
4840 | if (ret) | |
c0fba368 AE |
4841 | return ret; |
4842 | rbd_assert(rbd_dev->spec->image_id); | |
4843 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4844 | ||
332bb12d AE |
4845 | ret = rbd_dev_header_name(rbd_dev); |
4846 | if (ret) | |
4847 | goto err_out_format; | |
4848 | ||
b644de2b AE |
4849 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
4850 | if (ret) | |
4851 | goto out_header_name; | |
4852 | ||
c0fba368 | 4853 | if (rbd_dev->image_format == 1) |
a30b71b9 AE |
4854 | ret = rbd_dev_v1_probe(rbd_dev); |
4855 | else | |
4856 | ret = rbd_dev_v2_probe(rbd_dev); | |
5655c4d9 | 4857 | if (ret) |
b644de2b | 4858 | goto err_out_watch; |
83a06263 | 4859 | |
9bb81c9b AE |
4860 | ret = rbd_dev_snaps_update(rbd_dev); |
4861 | if (ret) | |
6fd48b3b | 4862 | goto err_out_probe; |
9bb81c9b AE |
4863 | |
4864 | ret = rbd_dev_spec_update(rbd_dev); | |
4865 | if (ret) | |
4866 | goto err_out_snaps; | |
4867 | ||
4868 | ret = rbd_dev_probe_parent(rbd_dev); | |
6fd48b3b AE |
4869 | if (!ret) |
4870 | return 0; | |
83a06263 | 4871 | |
9bb81c9b AE |
4872 | err_out_snaps: |
4873 | rbd_remove_all_snaps(rbd_dev); | |
6fd48b3b AE |
4874 | err_out_probe: |
4875 | rbd_dev_unprobe(rbd_dev); | |
b644de2b AE |
4876 | err_out_watch: |
4877 | tmp = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4878 | if (tmp) | |
4879 | rbd_warn(rbd_dev, "unable to tear down watch request\n"); | |
332bb12d AE |
4880 | out_header_name: |
4881 | kfree(rbd_dev->header_name); | |
4882 | rbd_dev->header_name = NULL; | |
4883 | err_out_format: | |
4884 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
4885 | kfree(rbd_dev->spec->image_id); |
4886 | rbd_dev->spec->image_id = NULL; | |
4887 | ||
4888 | dout("probe failed, returning %d\n", ret); | |
4889 | ||
a30b71b9 AE |
4890 | return ret; |
4891 | } | |
4892 | ||
59c2be1e YS |
4893 | static ssize_t rbd_add(struct bus_type *bus, |
4894 | const char *buf, | |
4895 | size_t count) | |
602adf40 | 4896 | { |
cb8627c7 | 4897 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4898 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4899 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4900 | struct rbd_spec *spec = NULL; |
9d3997fd | 4901 | struct rbd_client *rbdc; |
27cc2594 AE |
4902 | struct ceph_osd_client *osdc; |
4903 | int rc = -ENOMEM; | |
602adf40 YS |
4904 | |
4905 | if (!try_module_get(THIS_MODULE)) | |
4906 | return -ENODEV; | |
4907 | ||
602adf40 | 4908 | /* parse add command */ |
859c31df | 4909 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4910 | if (rc < 0) |
bd4ba655 | 4911 | goto err_out_module; |
78cea76e | 4912 | |
9d3997fd AE |
4913 | rbdc = rbd_get_client(ceph_opts); |
4914 | if (IS_ERR(rbdc)) { | |
4915 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4916 | goto err_out_args; |
9d3997fd | 4917 | } |
c53d5893 | 4918 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4919 | |
602adf40 | 4920 | /* pick the pool */ |
9d3997fd | 4921 | osdc = &rbdc->client->osdc; |
859c31df | 4922 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4923 | if (rc < 0) |
4924 | goto err_out_client; | |
c0cd10db | 4925 | spec->pool_id = (u64)rc; |
859c31df | 4926 | |
0903e875 AE |
4927 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4928 | ||
c0cd10db AE |
4929 | if (spec->pool_id > (u64)U32_MAX) { |
4930 | rbd_warn(NULL, "pool id too large (%llu > %u)\n", | |
4931 | (unsigned long long)spec->pool_id, U32_MAX); | |
0903e875 AE |
4932 | rc = -EIO; |
4933 | goto err_out_client; | |
4934 | } | |
4935 | ||
c53d5893 | 4936 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4937 | if (!rbd_dev) |
4938 | goto err_out_client; | |
c53d5893 AE |
4939 | rbdc = NULL; /* rbd_dev now owns this */ |
4940 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4941 | |
bd4ba655 | 4942 | rbd_dev->mapping.read_only = rbd_opts->read_only; |
c53d5893 AE |
4943 | kfree(rbd_opts); |
4944 | rbd_opts = NULL; /* done with this */ | |
bd4ba655 | 4945 | |
71f293e2 | 4946 | rc = rbd_dev_image_probe(rbd_dev); |
a30b71b9 | 4947 | if (rc < 0) |
c53d5893 | 4948 | goto err_out_rbd_dev; |
05fd6f6f | 4949 | |
b536f69a AE |
4950 | rc = rbd_dev_device_setup(rbd_dev); |
4951 | if (!rc) | |
4952 | return count; | |
4953 | ||
4954 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
4955 | err_out_rbd_dev: |
4956 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4957 | err_out_client: |
9d3997fd | 4958 | rbd_put_client(rbdc); |
0ddebc0c | 4959 | err_out_args: |
78cea76e AE |
4960 | if (ceph_opts) |
4961 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4962 | kfree(rbd_opts); |
859c31df | 4963 | rbd_spec_put(spec); |
bd4ba655 AE |
4964 | err_out_module: |
4965 | module_put(THIS_MODULE); | |
27cc2594 | 4966 | |
602adf40 | 4967 | dout("Error adding device %s\n", buf); |
27cc2594 | 4968 | |
c0cd10db | 4969 | return (ssize_t)rc; |
602adf40 YS |
4970 | } |
4971 | ||
de71a297 | 4972 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4973 | { |
4974 | struct list_head *tmp; | |
4975 | struct rbd_device *rbd_dev; | |
4976 | ||
e124a82f | 4977 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4978 | list_for_each(tmp, &rbd_dev_list) { |
4979 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4980 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4981 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4982 | return rbd_dev; |
e124a82f | 4983 | } |
602adf40 | 4984 | } |
e124a82f | 4985 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4986 | return NULL; |
4987 | } | |
4988 | ||
200a6a8b | 4989 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 4990 | { |
593a9e7b | 4991 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4992 | |
602adf40 | 4993 | rbd_free_disk(rbd_dev); |
200a6a8b AE |
4994 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
4995 | rbd_dev_clear_mapping(rbd_dev); | |
602adf40 | 4996 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
200a6a8b | 4997 | rbd_dev->major = 0; |
e2839308 | 4998 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 4999 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
5000 | } |
5001 | ||
05a46afd AE |
5002 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5003 | { | |
ad945fc1 | 5004 | while (rbd_dev->parent) { |
05a46afd AE |
5005 | struct rbd_device *first = rbd_dev; |
5006 | struct rbd_device *second = first->parent; | |
5007 | struct rbd_device *third; | |
5008 | ||
5009 | /* | |
5010 | * Follow to the parent with no grandparent and | |
5011 | * remove it. | |
5012 | */ | |
5013 | while (second && (third = second->parent)) { | |
5014 | first = second; | |
5015 | second = third; | |
5016 | } | |
ad945fc1 | 5017 | rbd_assert(second); |
8ad42cd0 | 5018 | rbd_dev_image_release(second); |
ad945fc1 AE |
5019 | first->parent = NULL; |
5020 | first->parent_overlap = 0; | |
5021 | ||
5022 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5023 | rbd_spec_put(first->parent_spec); |
5024 | first->parent_spec = NULL; | |
05a46afd AE |
5025 | } |
5026 | } | |
5027 | ||
dfc5606d YS |
5028 | static ssize_t rbd_remove(struct bus_type *bus, |
5029 | const char *buf, | |
5030 | size_t count) | |
602adf40 YS |
5031 | { |
5032 | struct rbd_device *rbd_dev = NULL; | |
0d8189e1 | 5033 | int target_id; |
602adf40 | 5034 | unsigned long ul; |
0d8189e1 | 5035 | int ret; |
602adf40 | 5036 | |
0d8189e1 AE |
5037 | ret = strict_strtoul(buf, 10, &ul); |
5038 | if (ret) | |
5039 | return ret; | |
602adf40 YS |
5040 | |
5041 | /* convert to int; abort if we lost anything in the conversion */ | |
5042 | target_id = (int) ul; | |
5043 | if (target_id != ul) | |
5044 | return -EINVAL; | |
5045 | ||
5046 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
5047 | ||
5048 | rbd_dev = __rbd_get_dev(target_id); | |
5049 | if (!rbd_dev) { | |
5050 | ret = -ENOENT; | |
5051 | goto done; | |
42382b70 AE |
5052 | } |
5053 | ||
a14ea269 | 5054 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 5055 | if (rbd_dev->open_count) |
42382b70 | 5056 | ret = -EBUSY; |
b82d167b AE |
5057 | else |
5058 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 5059 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 5060 | if (ret < 0) |
42382b70 | 5061 | goto done; |
0d8189e1 | 5062 | ret = count; |
b480815a | 5063 | rbd_bus_del_dev(rbd_dev); |
8ad42cd0 | 5064 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 5065 | module_put(THIS_MODULE); |
602adf40 YS |
5066 | done: |
5067 | mutex_unlock(&ctl_mutex); | |
aafb230e | 5068 | |
602adf40 YS |
5069 | return ret; |
5070 | } | |
5071 | ||
602adf40 YS |
5072 | /* |
5073 | * create control files in sysfs | |
dfc5606d | 5074 | * /sys/bus/rbd/... |
602adf40 YS |
5075 | */ |
5076 | static int rbd_sysfs_init(void) | |
5077 | { | |
dfc5606d | 5078 | int ret; |
602adf40 | 5079 | |
fed4c143 | 5080 | ret = device_register(&rbd_root_dev); |
21079786 | 5081 | if (ret < 0) |
dfc5606d | 5082 | return ret; |
602adf40 | 5083 | |
fed4c143 AE |
5084 | ret = bus_register(&rbd_bus_type); |
5085 | if (ret < 0) | |
5086 | device_unregister(&rbd_root_dev); | |
602adf40 | 5087 | |
602adf40 YS |
5088 | return ret; |
5089 | } | |
5090 | ||
5091 | static void rbd_sysfs_cleanup(void) | |
5092 | { | |
dfc5606d | 5093 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5094 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5095 | } |
5096 | ||
cc344fa1 | 5097 | static int __init rbd_init(void) |
602adf40 YS |
5098 | { |
5099 | int rc; | |
5100 | ||
1e32d34c AE |
5101 | if (!libceph_compatible(NULL)) { |
5102 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
5103 | ||
5104 | return -EINVAL; | |
5105 | } | |
602adf40 YS |
5106 | rc = rbd_sysfs_init(); |
5107 | if (rc) | |
5108 | return rc; | |
f0f8cef5 | 5109 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
602adf40 YS |
5110 | return 0; |
5111 | } | |
5112 | ||
cc344fa1 | 5113 | static void __exit rbd_exit(void) |
602adf40 YS |
5114 | { |
5115 | rbd_sysfs_cleanup(); | |
5116 | } | |
5117 | ||
5118 | module_init(rbd_init); | |
5119 | module_exit(rbd_exit); | |
5120 | ||
5121 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
5122 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
5123 | MODULE_DESCRIPTION("rados block device"); | |
5124 | ||
5125 | /* following authorship retained from original osdblk.c */ | |
5126 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5127 | ||
5128 | MODULE_LICENSE("GPL"); |