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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
30d1cff8 | 36 | #include <linux/bsearch.h> |
602adf40 YS |
37 | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/blkdev.h> | |
1c2a9dfe | 43 | #include <linux/slab.h> |
602adf40 YS |
44 | |
45 | #include "rbd_types.h" | |
46 | ||
aafb230e AE |
47 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
48 | ||
593a9e7b AE |
49 | /* |
50 | * The basic unit of block I/O is a sector. It is interpreted in a | |
51 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
52 | * universally 512 bytes. These symbols are just slightly more | |
53 | * meaningful than the bare numbers they represent. | |
54 | */ | |
55 | #define SECTOR_SHIFT 9 | |
56 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
57 | ||
f0f8cef5 AE |
58 | #define RBD_DRV_NAME "rbd" |
59 | #define RBD_DRV_NAME_LONG "rbd (rados block device)" | |
602adf40 YS |
60 | |
61 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
62 | ||
d4b125e9 AE |
63 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
64 | #define RBD_MAX_SNAP_NAME_LEN \ | |
65 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
66 | ||
35d489f9 | 67 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
68 | |
69 | #define RBD_SNAP_HEAD_NAME "-" | |
70 | ||
9682fc6d AE |
71 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
72 | ||
9e15b77d AE |
73 | /* This allows a single page to hold an image name sent by OSD */ |
74 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 75 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 76 | |
1e130199 | 77 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 78 | |
d889140c AE |
79 | /* Feature bits */ |
80 | ||
5cbf6f12 AE |
81 | #define RBD_FEATURE_LAYERING (1<<0) |
82 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
83 | #define RBD_FEATURES_ALL \ | |
84 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
85 | |
86 | /* Features supported by this (client software) implementation. */ | |
87 | ||
770eba6e | 88 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 89 | |
81a89793 AE |
90 | /* |
91 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
92 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
93 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
94 | * enough to hold all possible device names. | |
95 | */ | |
602adf40 | 96 | #define DEV_NAME_LEN 32 |
81a89793 | 97 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
98 | |
99 | /* | |
100 | * block device image metadata (in-memory version) | |
101 | */ | |
102 | struct rbd_image_header { | |
f35a4dee | 103 | /* These six fields never change for a given rbd image */ |
849b4260 | 104 | char *object_prefix; |
602adf40 YS |
105 | __u8 obj_order; |
106 | __u8 crypt_type; | |
107 | __u8 comp_type; | |
f35a4dee AE |
108 | u64 stripe_unit; |
109 | u64 stripe_count; | |
110 | u64 features; /* Might be changeable someday? */ | |
602adf40 | 111 | |
f84344f3 AE |
112 | /* The remaining fields need to be updated occasionally */ |
113 | u64 image_size; | |
114 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
115 | char *snap_names; /* format 1 only */ |
116 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
117 | }; |
118 | ||
0d7dbfce AE |
119 | /* |
120 | * An rbd image specification. | |
121 | * | |
122 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
123 | * identify an image. Each rbd_dev structure includes a pointer to |
124 | * an rbd_spec structure that encapsulates this identity. | |
125 | * | |
126 | * Each of the id's in an rbd_spec has an associated name. For a | |
127 | * user-mapped image, the names are supplied and the id's associated | |
128 | * with them are looked up. For a layered image, a parent image is | |
129 | * defined by the tuple, and the names are looked up. | |
130 | * | |
131 | * An rbd_dev structure contains a parent_spec pointer which is | |
132 | * non-null if the image it represents is a child in a layered | |
133 | * image. This pointer will refer to the rbd_spec structure used | |
134 | * by the parent rbd_dev for its own identity (i.e., the structure | |
135 | * is shared between the parent and child). | |
136 | * | |
137 | * Since these structures are populated once, during the discovery | |
138 | * phase of image construction, they are effectively immutable so | |
139 | * we make no effort to synchronize access to them. | |
140 | * | |
141 | * Note that code herein does not assume the image name is known (it | |
142 | * could be a null pointer). | |
0d7dbfce AE |
143 | */ |
144 | struct rbd_spec { | |
145 | u64 pool_id; | |
ecb4dc22 | 146 | const char *pool_name; |
0d7dbfce | 147 | |
ecb4dc22 AE |
148 | const char *image_id; |
149 | const char *image_name; | |
0d7dbfce AE |
150 | |
151 | u64 snap_id; | |
ecb4dc22 | 152 | const char *snap_name; |
0d7dbfce AE |
153 | |
154 | struct kref kref; | |
155 | }; | |
156 | ||
602adf40 | 157 | /* |
f0f8cef5 | 158 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
159 | */ |
160 | struct rbd_client { | |
161 | struct ceph_client *client; | |
162 | struct kref kref; | |
163 | struct list_head node; | |
164 | }; | |
165 | ||
bf0d5f50 AE |
166 | struct rbd_img_request; |
167 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
168 | ||
169 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
170 | ||
171 | struct rbd_obj_request; | |
172 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
173 | ||
9969ebc5 AE |
174 | enum obj_request_type { |
175 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
176 | }; | |
bf0d5f50 | 177 | |
926f9b3f AE |
178 | enum obj_req_flags { |
179 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 180 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
181 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
182 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
183 | }; |
184 | ||
bf0d5f50 AE |
185 | struct rbd_obj_request { |
186 | const char *object_name; | |
187 | u64 offset; /* object start byte */ | |
188 | u64 length; /* bytes from offset */ | |
926f9b3f | 189 | unsigned long flags; |
bf0d5f50 | 190 | |
c5b5ef6c AE |
191 | /* |
192 | * An object request associated with an image will have its | |
193 | * img_data flag set; a standalone object request will not. | |
194 | * | |
195 | * A standalone object request will have which == BAD_WHICH | |
196 | * and a null obj_request pointer. | |
197 | * | |
198 | * An object request initiated in support of a layered image | |
199 | * object (to check for its existence before a write) will | |
200 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
201 | * | |
202 | * Finally, an object request for rbd image data will have | |
203 | * which != BAD_WHICH, and will have a non-null img_request | |
204 | * pointer. The value of which will be in the range | |
205 | * 0..(img_request->obj_request_count-1). | |
206 | */ | |
207 | union { | |
208 | struct rbd_obj_request *obj_request; /* STAT op */ | |
209 | struct { | |
210 | struct rbd_img_request *img_request; | |
211 | u64 img_offset; | |
212 | /* links for img_request->obj_requests list */ | |
213 | struct list_head links; | |
214 | }; | |
215 | }; | |
bf0d5f50 AE |
216 | u32 which; /* posn image request list */ |
217 | ||
218 | enum obj_request_type type; | |
788e2df3 AE |
219 | union { |
220 | struct bio *bio_list; | |
221 | struct { | |
222 | struct page **pages; | |
223 | u32 page_count; | |
224 | }; | |
225 | }; | |
0eefd470 | 226 | struct page **copyup_pages; |
bf0d5f50 AE |
227 | |
228 | struct ceph_osd_request *osd_req; | |
229 | ||
230 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 231 | int result; |
bf0d5f50 AE |
232 | |
233 | rbd_obj_callback_t callback; | |
788e2df3 | 234 | struct completion completion; |
bf0d5f50 AE |
235 | |
236 | struct kref kref; | |
237 | }; | |
238 | ||
0c425248 | 239 | enum img_req_flags { |
9849e986 AE |
240 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
241 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 242 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
243 | }; |
244 | ||
bf0d5f50 | 245 | struct rbd_img_request { |
bf0d5f50 AE |
246 | struct rbd_device *rbd_dev; |
247 | u64 offset; /* starting image byte offset */ | |
248 | u64 length; /* byte count from offset */ | |
0c425248 | 249 | unsigned long flags; |
bf0d5f50 | 250 | union { |
9849e986 | 251 | u64 snap_id; /* for reads */ |
bf0d5f50 | 252 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
253 | }; |
254 | union { | |
255 | struct request *rq; /* block request */ | |
256 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 257 | }; |
3d7efd18 | 258 | struct page **copyup_pages; |
bf0d5f50 AE |
259 | spinlock_t completion_lock;/* protects next_completion */ |
260 | u32 next_completion; | |
261 | rbd_img_callback_t callback; | |
55f27e09 | 262 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 263 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
264 | |
265 | u32 obj_request_count; | |
266 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
267 | ||
268 | struct kref kref; | |
269 | }; | |
270 | ||
271 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 272 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 273 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 274 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 275 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 276 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 277 | |
f84344f3 | 278 | struct rbd_mapping { |
99c1f08f | 279 | u64 size; |
34b13184 | 280 | u64 features; |
f84344f3 AE |
281 | bool read_only; |
282 | }; | |
283 | ||
602adf40 YS |
284 | /* |
285 | * a single device | |
286 | */ | |
287 | struct rbd_device { | |
de71a297 | 288 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
289 | |
290 | int major; /* blkdev assigned major */ | |
291 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
602adf40 | 292 | |
a30b71b9 | 293 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
294 | struct rbd_client *rbd_client; |
295 | ||
296 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
297 | ||
b82d167b | 298 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
299 | |
300 | struct rbd_image_header header; | |
b82d167b | 301 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 302 | struct rbd_spec *spec; |
602adf40 | 303 | |
0d7dbfce | 304 | char *header_name; |
971f839a | 305 | |
0903e875 AE |
306 | struct ceph_file_layout layout; |
307 | ||
59c2be1e | 308 | struct ceph_osd_event *watch_event; |
975241af | 309 | struct rbd_obj_request *watch_request; |
59c2be1e | 310 | |
86b00e0d AE |
311 | struct rbd_spec *parent_spec; |
312 | u64 parent_overlap; | |
2f82ee54 | 313 | struct rbd_device *parent; |
86b00e0d | 314 | |
c666601a JD |
315 | /* protects updating the header */ |
316 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
317 | |
318 | struct rbd_mapping mapping; | |
602adf40 YS |
319 | |
320 | struct list_head node; | |
dfc5606d | 321 | |
dfc5606d YS |
322 | /* sysfs related */ |
323 | struct device dev; | |
b82d167b | 324 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
325 | }; |
326 | ||
b82d167b AE |
327 | /* |
328 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
329 | * rbd_dev->lock is used to protect access. | |
330 | * | |
331 | * Currently, only the "removing" flag (which is coupled with the | |
332 | * "open_count" field) requires atomic access. | |
333 | */ | |
6d292906 AE |
334 | enum rbd_dev_flags { |
335 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 336 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
337 | }; |
338 | ||
602adf40 | 339 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
e124a82f | 340 | |
602adf40 | 341 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
342 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
343 | ||
432b8587 AE |
344 | static LIST_HEAD(rbd_client_list); /* clients */ |
345 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 346 | |
78c2a44a AE |
347 | /* Slab caches for frequently-allocated structures */ |
348 | ||
1c2a9dfe | 349 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 350 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 351 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 352 | |
3d7efd18 AE |
353 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
354 | ||
200a6a8b | 355 | static void rbd_dev_device_release(struct device *dev); |
dfc5606d | 356 | |
f0f8cef5 AE |
357 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
358 | size_t count); | |
359 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
360 | size_t count); | |
51344a38 | 361 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool read_only); |
f0f8cef5 AE |
362 | |
363 | static struct bus_attribute rbd_bus_attrs[] = { | |
364 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
365 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
366 | __ATTR_NULL | |
367 | }; | |
368 | ||
369 | static struct bus_type rbd_bus_type = { | |
370 | .name = "rbd", | |
371 | .bus_attrs = rbd_bus_attrs, | |
372 | }; | |
373 | ||
374 | static void rbd_root_dev_release(struct device *dev) | |
375 | { | |
376 | } | |
377 | ||
378 | static struct device rbd_root_dev = { | |
379 | .init_name = "rbd", | |
380 | .release = rbd_root_dev_release, | |
381 | }; | |
382 | ||
06ecc6cb AE |
383 | static __printf(2, 3) |
384 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
385 | { | |
386 | struct va_format vaf; | |
387 | va_list args; | |
388 | ||
389 | va_start(args, fmt); | |
390 | vaf.fmt = fmt; | |
391 | vaf.va = &args; | |
392 | ||
393 | if (!rbd_dev) | |
394 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
395 | else if (rbd_dev->disk) | |
396 | printk(KERN_WARNING "%s: %s: %pV\n", | |
397 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
398 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
399 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
400 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
401 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
402 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
403 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
404 | else /* punt */ | |
405 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
406 | RBD_DRV_NAME, rbd_dev, &vaf); | |
407 | va_end(args); | |
408 | } | |
409 | ||
aafb230e AE |
410 | #ifdef RBD_DEBUG |
411 | #define rbd_assert(expr) \ | |
412 | if (unlikely(!(expr))) { \ | |
413 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
414 | "at line %d:\n\n" \ | |
415 | "\trbd_assert(%s);\n\n", \ | |
416 | __func__, __LINE__, #expr); \ | |
417 | BUG(); \ | |
418 | } | |
419 | #else /* !RBD_DEBUG */ | |
420 | # define rbd_assert(expr) ((void) 0) | |
421 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 422 | |
b454e36d | 423 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
424 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
425 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 426 | |
cc4a38bd AE |
427 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
428 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev); | |
54cac61f AE |
429 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
430 | u64 snap_id); | |
2ad3d716 AE |
431 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
432 | u8 *order, u64 *snap_size); | |
433 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
434 | u64 *snap_features); | |
435 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); | |
59c2be1e | 436 | |
602adf40 YS |
437 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
438 | { | |
f0f8cef5 | 439 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 440 | bool removing = false; |
602adf40 | 441 | |
f84344f3 | 442 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
443 | return -EROFS; |
444 | ||
a14ea269 | 445 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
446 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
447 | removing = true; | |
448 | else | |
449 | rbd_dev->open_count++; | |
a14ea269 | 450 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
451 | if (removing) |
452 | return -ENOENT; | |
453 | ||
42382b70 | 454 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 455 | (void) get_device(&rbd_dev->dev); |
f84344f3 | 456 | set_device_ro(bdev, rbd_dev->mapping.read_only); |
42382b70 | 457 | mutex_unlock(&ctl_mutex); |
340c7a2b | 458 | |
602adf40 YS |
459 | return 0; |
460 | } | |
461 | ||
dfc5606d YS |
462 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
463 | { | |
464 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
465 | unsigned long open_count_before; |
466 | ||
a14ea269 | 467 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 468 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 469 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 470 | rbd_assert(open_count_before > 0); |
dfc5606d | 471 | |
42382b70 | 472 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
c3e946ce | 473 | put_device(&rbd_dev->dev); |
42382b70 | 474 | mutex_unlock(&ctl_mutex); |
dfc5606d YS |
475 | |
476 | return 0; | |
477 | } | |
478 | ||
602adf40 YS |
479 | static const struct block_device_operations rbd_bd_ops = { |
480 | .owner = THIS_MODULE, | |
481 | .open = rbd_open, | |
dfc5606d | 482 | .release = rbd_release, |
602adf40 YS |
483 | }; |
484 | ||
485 | /* | |
486 | * Initialize an rbd client instance. | |
43ae4701 | 487 | * We own *ceph_opts. |
602adf40 | 488 | */ |
f8c38929 | 489 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
490 | { |
491 | struct rbd_client *rbdc; | |
492 | int ret = -ENOMEM; | |
493 | ||
37206ee5 | 494 | dout("%s:\n", __func__); |
602adf40 YS |
495 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
496 | if (!rbdc) | |
497 | goto out_opt; | |
498 | ||
499 | kref_init(&rbdc->kref); | |
500 | INIT_LIST_HEAD(&rbdc->node); | |
501 | ||
bc534d86 AE |
502 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
503 | ||
43ae4701 | 504 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 505 | if (IS_ERR(rbdc->client)) |
bc534d86 | 506 | goto out_mutex; |
43ae4701 | 507 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
508 | |
509 | ret = ceph_open_session(rbdc->client); | |
510 | if (ret < 0) | |
511 | goto out_err; | |
512 | ||
432b8587 | 513 | spin_lock(&rbd_client_list_lock); |
602adf40 | 514 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 515 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 516 | |
bc534d86 | 517 | mutex_unlock(&ctl_mutex); |
37206ee5 | 518 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 519 | |
602adf40 YS |
520 | return rbdc; |
521 | ||
522 | out_err: | |
523 | ceph_destroy_client(rbdc->client); | |
bc534d86 AE |
524 | out_mutex: |
525 | mutex_unlock(&ctl_mutex); | |
602adf40 YS |
526 | kfree(rbdc); |
527 | out_opt: | |
43ae4701 AE |
528 | if (ceph_opts) |
529 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
530 | dout("%s: error %d\n", __func__, ret); |
531 | ||
28f259b7 | 532 | return ERR_PTR(ret); |
602adf40 YS |
533 | } |
534 | ||
2f82ee54 AE |
535 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
536 | { | |
537 | kref_get(&rbdc->kref); | |
538 | ||
539 | return rbdc; | |
540 | } | |
541 | ||
602adf40 | 542 | /* |
1f7ba331 AE |
543 | * Find a ceph client with specific addr and configuration. If |
544 | * found, bump its reference count. | |
602adf40 | 545 | */ |
1f7ba331 | 546 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
547 | { |
548 | struct rbd_client *client_node; | |
1f7ba331 | 549 | bool found = false; |
602adf40 | 550 | |
43ae4701 | 551 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
552 | return NULL; |
553 | ||
1f7ba331 AE |
554 | spin_lock(&rbd_client_list_lock); |
555 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
556 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
557 | __rbd_get_client(client_node); |
558 | ||
1f7ba331 AE |
559 | found = true; |
560 | break; | |
561 | } | |
562 | } | |
563 | spin_unlock(&rbd_client_list_lock); | |
564 | ||
565 | return found ? client_node : NULL; | |
602adf40 YS |
566 | } |
567 | ||
59c2be1e YS |
568 | /* |
569 | * mount options | |
570 | */ | |
571 | enum { | |
59c2be1e YS |
572 | Opt_last_int, |
573 | /* int args above */ | |
574 | Opt_last_string, | |
575 | /* string args above */ | |
cc0538b6 AE |
576 | Opt_read_only, |
577 | Opt_read_write, | |
578 | /* Boolean args above */ | |
579 | Opt_last_bool, | |
59c2be1e YS |
580 | }; |
581 | ||
43ae4701 | 582 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
583 | /* int args above */ |
584 | /* string args above */ | |
be466c1c | 585 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
586 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
587 | {Opt_read_write, "read_write"}, | |
588 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
589 | /* Boolean args above */ | |
59c2be1e YS |
590 | {-1, NULL} |
591 | }; | |
592 | ||
98571b5a AE |
593 | struct rbd_options { |
594 | bool read_only; | |
595 | }; | |
596 | ||
597 | #define RBD_READ_ONLY_DEFAULT false | |
598 | ||
59c2be1e YS |
599 | static int parse_rbd_opts_token(char *c, void *private) |
600 | { | |
43ae4701 | 601 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
602 | substring_t argstr[MAX_OPT_ARGS]; |
603 | int token, intval, ret; | |
604 | ||
43ae4701 | 605 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
606 | if (token < 0) |
607 | return -EINVAL; | |
608 | ||
609 | if (token < Opt_last_int) { | |
610 | ret = match_int(&argstr[0], &intval); | |
611 | if (ret < 0) { | |
612 | pr_err("bad mount option arg (not int) " | |
613 | "at '%s'\n", c); | |
614 | return ret; | |
615 | } | |
616 | dout("got int token %d val %d\n", token, intval); | |
617 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
618 | dout("got string token %d val %s\n", token, | |
619 | argstr[0].from); | |
cc0538b6 AE |
620 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
621 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
622 | } else { |
623 | dout("got token %d\n", token); | |
624 | } | |
625 | ||
626 | switch (token) { | |
cc0538b6 AE |
627 | case Opt_read_only: |
628 | rbd_opts->read_only = true; | |
629 | break; | |
630 | case Opt_read_write: | |
631 | rbd_opts->read_only = false; | |
632 | break; | |
59c2be1e | 633 | default: |
aafb230e AE |
634 | rbd_assert(false); |
635 | break; | |
59c2be1e YS |
636 | } |
637 | return 0; | |
638 | } | |
639 | ||
602adf40 YS |
640 | /* |
641 | * Get a ceph client with specific addr and configuration, if one does | |
642 | * not exist create it. | |
643 | */ | |
9d3997fd | 644 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 645 | { |
f8c38929 | 646 | struct rbd_client *rbdc; |
59c2be1e | 647 | |
1f7ba331 | 648 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 649 | if (rbdc) /* using an existing client */ |
43ae4701 | 650 | ceph_destroy_options(ceph_opts); |
9d3997fd | 651 | else |
f8c38929 | 652 | rbdc = rbd_client_create(ceph_opts); |
602adf40 | 653 | |
9d3997fd | 654 | return rbdc; |
602adf40 YS |
655 | } |
656 | ||
657 | /* | |
658 | * Destroy ceph client | |
d23a4b3f | 659 | * |
432b8587 | 660 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
661 | */ |
662 | static void rbd_client_release(struct kref *kref) | |
663 | { | |
664 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
665 | ||
37206ee5 | 666 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 667 | spin_lock(&rbd_client_list_lock); |
602adf40 | 668 | list_del(&rbdc->node); |
cd9d9f5d | 669 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
670 | |
671 | ceph_destroy_client(rbdc->client); | |
672 | kfree(rbdc); | |
673 | } | |
674 | ||
675 | /* | |
676 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
677 | * it. | |
678 | */ | |
9d3997fd | 679 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 680 | { |
c53d5893 AE |
681 | if (rbdc) |
682 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
683 | } |
684 | ||
a30b71b9 AE |
685 | static bool rbd_image_format_valid(u32 image_format) |
686 | { | |
687 | return image_format == 1 || image_format == 2; | |
688 | } | |
689 | ||
8e94af8e AE |
690 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
691 | { | |
103a150f AE |
692 | size_t size; |
693 | u32 snap_count; | |
694 | ||
695 | /* The header has to start with the magic rbd header text */ | |
696 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
697 | return false; | |
698 | ||
db2388b6 AE |
699 | /* The bio layer requires at least sector-sized I/O */ |
700 | ||
701 | if (ondisk->options.order < SECTOR_SHIFT) | |
702 | return false; | |
703 | ||
704 | /* If we use u64 in a few spots we may be able to loosen this */ | |
705 | ||
706 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
707 | return false; | |
708 | ||
103a150f AE |
709 | /* |
710 | * The size of a snapshot header has to fit in a size_t, and | |
711 | * that limits the number of snapshots. | |
712 | */ | |
713 | snap_count = le32_to_cpu(ondisk->snap_count); | |
714 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
715 | if (snap_count > size / sizeof (__le64)) | |
716 | return false; | |
717 | ||
718 | /* | |
719 | * Not only that, but the size of the entire the snapshot | |
720 | * header must also be representable in a size_t. | |
721 | */ | |
722 | size -= snap_count * sizeof (__le64); | |
723 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
724 | return false; | |
725 | ||
726 | return true; | |
8e94af8e AE |
727 | } |
728 | ||
602adf40 YS |
729 | /* |
730 | * Create a new header structure, translate header format from the on-disk | |
731 | * header. | |
732 | */ | |
733 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
4156d998 | 734 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 735 | { |
ccece235 | 736 | u32 snap_count; |
58c17b0e | 737 | size_t len; |
d2bb24e5 | 738 | size_t size; |
621901d6 | 739 | u32 i; |
602adf40 | 740 | |
103a150f AE |
741 | snap_count = le32_to_cpu(ondisk->snap_count); |
742 | ||
58c17b0e AE |
743 | len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
744 | header->object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
6a52325f | 745 | if (!header->object_prefix) |
602adf40 | 746 | return -ENOMEM; |
58c17b0e AE |
747 | memcpy(header->object_prefix, ondisk->object_prefix, len); |
748 | header->object_prefix[len] = '\0'; | |
00f1f36f | 749 | |
602adf40 | 750 | if (snap_count) { |
f785cc1d AE |
751 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
752 | ||
621901d6 AE |
753 | /* Save a copy of the snapshot names */ |
754 | ||
f785cc1d AE |
755 | if (snap_names_len > (u64) SIZE_MAX) |
756 | return -EIO; | |
757 | header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
602adf40 | 758 | if (!header->snap_names) |
6a52325f | 759 | goto out_err; |
f785cc1d AE |
760 | /* |
761 | * Note that rbd_dev_v1_header_read() guarantees | |
762 | * the ondisk buffer we're working with has | |
763 | * snap_names_len bytes beyond the end of the | |
764 | * snapshot id array, this memcpy() is safe. | |
765 | */ | |
766 | memcpy(header->snap_names, &ondisk->snaps[snap_count], | |
767 | snap_names_len); | |
6a52325f | 768 | |
621901d6 AE |
769 | /* Record each snapshot's size */ |
770 | ||
d2bb24e5 AE |
771 | size = snap_count * sizeof (*header->snap_sizes); |
772 | header->snap_sizes = kmalloc(size, GFP_KERNEL); | |
602adf40 | 773 | if (!header->snap_sizes) |
6a52325f | 774 | goto out_err; |
621901d6 AE |
775 | for (i = 0; i < snap_count; i++) |
776 | header->snap_sizes[i] = | |
777 | le64_to_cpu(ondisk->snaps[i].image_size); | |
602adf40 YS |
778 | } else { |
779 | header->snap_names = NULL; | |
780 | header->snap_sizes = NULL; | |
781 | } | |
849b4260 | 782 | |
34b13184 | 783 | header->features = 0; /* No features support in v1 images */ |
602adf40 YS |
784 | header->obj_order = ondisk->options.order; |
785 | header->crypt_type = ondisk->options.crypt_type; | |
786 | header->comp_type = ondisk->options.comp_type; | |
6a52325f | 787 | |
621901d6 AE |
788 | /* Allocate and fill in the snapshot context */ |
789 | ||
f84344f3 | 790 | header->image_size = le64_to_cpu(ondisk->image_size); |
468521c1 | 791 | |
812164f8 | 792 | header->snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
6a52325f AE |
793 | if (!header->snapc) |
794 | goto out_err; | |
505cbb9b | 795 | header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
621901d6 | 796 | for (i = 0; i < snap_count; i++) |
468521c1 | 797 | header->snapc->snaps[i] = le64_to_cpu(ondisk->snaps[i].id); |
602adf40 YS |
798 | |
799 | return 0; | |
800 | ||
6a52325f | 801 | out_err: |
849b4260 | 802 | kfree(header->snap_sizes); |
ccece235 | 803 | header->snap_sizes = NULL; |
602adf40 | 804 | kfree(header->snap_names); |
ccece235 | 805 | header->snap_names = NULL; |
6a52325f AE |
806 | kfree(header->object_prefix); |
807 | header->object_prefix = NULL; | |
ccece235 | 808 | |
00f1f36f | 809 | return -ENOMEM; |
602adf40 YS |
810 | } |
811 | ||
9682fc6d AE |
812 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
813 | { | |
814 | const char *snap_name; | |
815 | ||
816 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
817 | ||
818 | /* Skip over names until we find the one we are looking for */ | |
819 | ||
820 | snap_name = rbd_dev->header.snap_names; | |
821 | while (which--) | |
822 | snap_name += strlen(snap_name) + 1; | |
823 | ||
824 | return kstrdup(snap_name, GFP_KERNEL); | |
825 | } | |
826 | ||
30d1cff8 AE |
827 | /* |
828 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
829 | * Note that result is for snapshots in *descending* order. | |
830 | */ | |
831 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
832 | { | |
833 | u64 snap_id1 = *(u64 *)s1; | |
834 | u64 snap_id2 = *(u64 *)s2; | |
835 | ||
836 | if (snap_id1 < snap_id2) | |
837 | return 1; | |
838 | return snap_id1 == snap_id2 ? 0 : -1; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Search a snapshot context to see if the given snapshot id is | |
843 | * present. | |
844 | * | |
845 | * Returns the position of the snapshot id in the array if it's found, | |
846 | * or BAD_SNAP_INDEX otherwise. | |
847 | * | |
848 | * Note: The snapshot array is in kept sorted (by the osd) in | |
849 | * reverse order, highest snapshot id first. | |
850 | */ | |
9682fc6d AE |
851 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
852 | { | |
853 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 854 | u64 *found; |
9682fc6d | 855 | |
30d1cff8 AE |
856 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
857 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 858 | |
30d1cff8 | 859 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
860 | } |
861 | ||
2ad3d716 AE |
862 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
863 | u64 snap_id) | |
9e15b77d | 864 | { |
54cac61f | 865 | u32 which; |
9e15b77d | 866 | |
54cac61f AE |
867 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
868 | if (which == BAD_SNAP_INDEX) | |
869 | return NULL; | |
870 | ||
871 | return _rbd_dev_v1_snap_name(rbd_dev, which); | |
872 | } | |
873 | ||
874 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
875 | { | |
9e15b77d AE |
876 | if (snap_id == CEPH_NOSNAP) |
877 | return RBD_SNAP_HEAD_NAME; | |
878 | ||
54cac61f AE |
879 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
880 | if (rbd_dev->image_format == 1) | |
881 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 882 | |
54cac61f | 883 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
884 | } |
885 | ||
2ad3d716 AE |
886 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
887 | u64 *snap_size) | |
602adf40 | 888 | { |
2ad3d716 AE |
889 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
890 | if (snap_id == CEPH_NOSNAP) { | |
891 | *snap_size = rbd_dev->header.image_size; | |
892 | } else if (rbd_dev->image_format == 1) { | |
893 | u32 which; | |
602adf40 | 894 | |
2ad3d716 AE |
895 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
896 | if (which == BAD_SNAP_INDEX) | |
897 | return -ENOENT; | |
e86924a8 | 898 | |
2ad3d716 AE |
899 | *snap_size = rbd_dev->header.snap_sizes[which]; |
900 | } else { | |
901 | u64 size = 0; | |
902 | int ret; | |
903 | ||
904 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
905 | if (ret) | |
906 | return ret; | |
907 | ||
908 | *snap_size = size; | |
909 | } | |
910 | return 0; | |
602adf40 YS |
911 | } |
912 | ||
2ad3d716 AE |
913 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
914 | u64 *snap_features) | |
602adf40 | 915 | { |
2ad3d716 AE |
916 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
917 | if (snap_id == CEPH_NOSNAP) { | |
918 | *snap_features = rbd_dev->header.features; | |
919 | } else if (rbd_dev->image_format == 1) { | |
920 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 921 | } else { |
2ad3d716 AE |
922 | u64 features = 0; |
923 | int ret; | |
8b0241f8 | 924 | |
2ad3d716 AE |
925 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
926 | if (ret) | |
927 | return ret; | |
928 | ||
929 | *snap_features = features; | |
930 | } | |
931 | return 0; | |
932 | } | |
933 | ||
934 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
935 | { | |
8f4b7d98 | 936 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
937 | u64 size = 0; |
938 | u64 features = 0; | |
939 | int ret; | |
940 | ||
2ad3d716 AE |
941 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
942 | if (ret) | |
943 | return ret; | |
944 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
945 | if (ret) | |
946 | return ret; | |
947 | ||
948 | rbd_dev->mapping.size = size; | |
949 | rbd_dev->mapping.features = features; | |
950 | ||
8b0241f8 | 951 | return 0; |
602adf40 YS |
952 | } |
953 | ||
d1cf5788 AE |
954 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
955 | { | |
956 | rbd_dev->mapping.size = 0; | |
957 | rbd_dev->mapping.features = 0; | |
d1cf5788 AE |
958 | } |
959 | ||
98571b5a | 960 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 961 | { |
65ccfe21 AE |
962 | char *name; |
963 | u64 segment; | |
964 | int ret; | |
602adf40 | 965 | |
78c2a44a | 966 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
967 | if (!name) |
968 | return NULL; | |
969 | segment = offset >> rbd_dev->header.obj_order; | |
2fd82b9e | 970 | ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
65ccfe21 | 971 | rbd_dev->header.object_prefix, segment); |
2fd82b9e | 972 | if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
65ccfe21 AE |
973 | pr_err("error formatting segment name for #%llu (%d)\n", |
974 | segment, ret); | |
975 | kfree(name); | |
976 | name = NULL; | |
977 | } | |
602adf40 | 978 | |
65ccfe21 AE |
979 | return name; |
980 | } | |
602adf40 | 981 | |
78c2a44a AE |
982 | static void rbd_segment_name_free(const char *name) |
983 | { | |
984 | /* The explicit cast here is needed to drop the const qualifier */ | |
985 | ||
986 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
987 | } | |
988 | ||
65ccfe21 AE |
989 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
990 | { | |
991 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 992 | |
65ccfe21 AE |
993 | return offset & (segment_size - 1); |
994 | } | |
995 | ||
996 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
997 | u64 offset, u64 length) | |
998 | { | |
999 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1000 | ||
1001 | offset &= segment_size - 1; | |
1002 | ||
aafb230e | 1003 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1004 | if (offset + length > segment_size) |
1005 | length = segment_size - offset; | |
1006 | ||
1007 | return length; | |
602adf40 YS |
1008 | } |
1009 | ||
029bcbd8 JD |
1010 | /* |
1011 | * returns the size of an object in the image | |
1012 | */ | |
1013 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1014 | { | |
1015 | return 1 << header->obj_order; | |
1016 | } | |
1017 | ||
602adf40 YS |
1018 | /* |
1019 | * bio helpers | |
1020 | */ | |
1021 | ||
1022 | static void bio_chain_put(struct bio *chain) | |
1023 | { | |
1024 | struct bio *tmp; | |
1025 | ||
1026 | while (chain) { | |
1027 | tmp = chain; | |
1028 | chain = chain->bi_next; | |
1029 | bio_put(tmp); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * zeros a bio chain, starting at specific offset | |
1035 | */ | |
1036 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1037 | { | |
1038 | struct bio_vec *bv; | |
1039 | unsigned long flags; | |
1040 | void *buf; | |
1041 | int i; | |
1042 | int pos = 0; | |
1043 | ||
1044 | while (chain) { | |
1045 | bio_for_each_segment(bv, chain, i) { | |
1046 | if (pos + bv->bv_len > start_ofs) { | |
1047 | int remainder = max(start_ofs - pos, 0); | |
1048 | buf = bvec_kmap_irq(bv, &flags); | |
1049 | memset(buf + remainder, 0, | |
1050 | bv->bv_len - remainder); | |
85b5aaa6 | 1051 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
1052 | } |
1053 | pos += bv->bv_len; | |
1054 | } | |
1055 | ||
1056 | chain = chain->bi_next; | |
1057 | } | |
1058 | } | |
1059 | ||
b9434c5b AE |
1060 | /* |
1061 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1062 | * starting at the given byte offset from the start of the array and | |
1063 | * continuing up to the given end offset. The pages array is | |
1064 | * assumed to be big enough to hold all bytes up to the end. | |
1065 | */ | |
1066 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1067 | { | |
1068 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1069 | ||
1070 | rbd_assert(end > offset); | |
1071 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1072 | while (offset < end) { | |
1073 | size_t page_offset; | |
1074 | size_t length; | |
1075 | unsigned long flags; | |
1076 | void *kaddr; | |
1077 | ||
1078 | page_offset = (size_t)(offset & ~PAGE_MASK); | |
1079 | length = min(PAGE_SIZE - page_offset, (size_t)(end - offset)); | |
1080 | local_irq_save(flags); | |
1081 | kaddr = kmap_atomic(*page); | |
1082 | memset(kaddr + page_offset, 0, length); | |
1083 | kunmap_atomic(kaddr); | |
1084 | local_irq_restore(flags); | |
1085 | ||
1086 | offset += length; | |
1087 | page++; | |
1088 | } | |
1089 | } | |
1090 | ||
602adf40 | 1091 | /* |
f7760dad AE |
1092 | * Clone a portion of a bio, starting at the given byte offset |
1093 | * and continuing for the number of bytes indicated. | |
602adf40 | 1094 | */ |
f7760dad AE |
1095 | static struct bio *bio_clone_range(struct bio *bio_src, |
1096 | unsigned int offset, | |
1097 | unsigned int len, | |
1098 | gfp_t gfpmask) | |
602adf40 | 1099 | { |
f7760dad AE |
1100 | struct bio_vec *bv; |
1101 | unsigned int resid; | |
1102 | unsigned short idx; | |
1103 | unsigned int voff; | |
1104 | unsigned short end_idx; | |
1105 | unsigned short vcnt; | |
1106 | struct bio *bio; | |
1107 | ||
1108 | /* Handle the easy case for the caller */ | |
1109 | ||
1110 | if (!offset && len == bio_src->bi_size) | |
1111 | return bio_clone(bio_src, gfpmask); | |
1112 | ||
1113 | if (WARN_ON_ONCE(!len)) | |
1114 | return NULL; | |
1115 | if (WARN_ON_ONCE(len > bio_src->bi_size)) | |
1116 | return NULL; | |
1117 | if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) | |
1118 | return NULL; | |
1119 | ||
1120 | /* Find first affected segment... */ | |
1121 | ||
1122 | resid = offset; | |
1123 | __bio_for_each_segment(bv, bio_src, idx, 0) { | |
1124 | if (resid < bv->bv_len) | |
1125 | break; | |
1126 | resid -= bv->bv_len; | |
602adf40 | 1127 | } |
f7760dad | 1128 | voff = resid; |
602adf40 | 1129 | |
f7760dad | 1130 | /* ...and the last affected segment */ |
602adf40 | 1131 | |
f7760dad AE |
1132 | resid += len; |
1133 | __bio_for_each_segment(bv, bio_src, end_idx, idx) { | |
1134 | if (resid <= bv->bv_len) | |
1135 | break; | |
1136 | resid -= bv->bv_len; | |
1137 | } | |
1138 | vcnt = end_idx - idx + 1; | |
1139 | ||
1140 | /* Build the clone */ | |
1141 | ||
1142 | bio = bio_alloc(gfpmask, (unsigned int) vcnt); | |
1143 | if (!bio) | |
1144 | return NULL; /* ENOMEM */ | |
602adf40 | 1145 | |
f7760dad AE |
1146 | bio->bi_bdev = bio_src->bi_bdev; |
1147 | bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); | |
1148 | bio->bi_rw = bio_src->bi_rw; | |
1149 | bio->bi_flags |= 1 << BIO_CLONED; | |
1150 | ||
1151 | /* | |
1152 | * Copy over our part of the bio_vec, then update the first | |
1153 | * and last (or only) entries. | |
1154 | */ | |
1155 | memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], | |
1156 | vcnt * sizeof (struct bio_vec)); | |
1157 | bio->bi_io_vec[0].bv_offset += voff; | |
1158 | if (vcnt > 1) { | |
1159 | bio->bi_io_vec[0].bv_len -= voff; | |
1160 | bio->bi_io_vec[vcnt - 1].bv_len = resid; | |
1161 | } else { | |
1162 | bio->bi_io_vec[0].bv_len = len; | |
602adf40 YS |
1163 | } |
1164 | ||
f7760dad AE |
1165 | bio->bi_vcnt = vcnt; |
1166 | bio->bi_size = len; | |
1167 | bio->bi_idx = 0; | |
1168 | ||
1169 | return bio; | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Clone a portion of a bio chain, starting at the given byte offset | |
1174 | * into the first bio in the source chain and continuing for the | |
1175 | * number of bytes indicated. The result is another bio chain of | |
1176 | * exactly the given length, or a null pointer on error. | |
1177 | * | |
1178 | * The bio_src and offset parameters are both in-out. On entry they | |
1179 | * refer to the first source bio and the offset into that bio where | |
1180 | * the start of data to be cloned is located. | |
1181 | * | |
1182 | * On return, bio_src is updated to refer to the bio in the source | |
1183 | * chain that contains first un-cloned byte, and *offset will | |
1184 | * contain the offset of that byte within that bio. | |
1185 | */ | |
1186 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1187 | unsigned int *offset, | |
1188 | unsigned int len, | |
1189 | gfp_t gfpmask) | |
1190 | { | |
1191 | struct bio *bi = *bio_src; | |
1192 | unsigned int off = *offset; | |
1193 | struct bio *chain = NULL; | |
1194 | struct bio **end; | |
1195 | ||
1196 | /* Build up a chain of clone bios up to the limit */ | |
1197 | ||
1198 | if (!bi || off >= bi->bi_size || !len) | |
1199 | return NULL; /* Nothing to clone */ | |
602adf40 | 1200 | |
f7760dad AE |
1201 | end = &chain; |
1202 | while (len) { | |
1203 | unsigned int bi_size; | |
1204 | struct bio *bio; | |
1205 | ||
f5400b7a AE |
1206 | if (!bi) { |
1207 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1208 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1209 | } |
f7760dad AE |
1210 | bi_size = min_t(unsigned int, bi->bi_size - off, len); |
1211 | bio = bio_clone_range(bi, off, bi_size, gfpmask); | |
1212 | if (!bio) | |
1213 | goto out_err; /* ENOMEM */ | |
1214 | ||
1215 | *end = bio; | |
1216 | end = &bio->bi_next; | |
602adf40 | 1217 | |
f7760dad AE |
1218 | off += bi_size; |
1219 | if (off == bi->bi_size) { | |
1220 | bi = bi->bi_next; | |
1221 | off = 0; | |
1222 | } | |
1223 | len -= bi_size; | |
1224 | } | |
1225 | *bio_src = bi; | |
1226 | *offset = off; | |
1227 | ||
1228 | return chain; | |
1229 | out_err: | |
1230 | bio_chain_put(chain); | |
602adf40 | 1231 | |
602adf40 YS |
1232 | return NULL; |
1233 | } | |
1234 | ||
926f9b3f AE |
1235 | /* |
1236 | * The default/initial value for all object request flags is 0. For | |
1237 | * each flag, once its value is set to 1 it is never reset to 0 | |
1238 | * again. | |
1239 | */ | |
57acbaa7 | 1240 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1241 | { |
57acbaa7 | 1242 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1243 | struct rbd_device *rbd_dev; |
1244 | ||
57acbaa7 AE |
1245 | rbd_dev = obj_request->img_request->rbd_dev; |
1246 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1247 | obj_request); |
1248 | } | |
1249 | } | |
1250 | ||
57acbaa7 | 1251 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1252 | { |
1253 | smp_mb(); | |
57acbaa7 | 1254 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1255 | } |
1256 | ||
57acbaa7 | 1257 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1258 | { |
57acbaa7 AE |
1259 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1260 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1261 | |
57acbaa7 AE |
1262 | if (obj_request_img_data_test(obj_request)) |
1263 | rbd_dev = obj_request->img_request->rbd_dev; | |
1264 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1265 | obj_request); |
1266 | } | |
1267 | } | |
1268 | ||
57acbaa7 | 1269 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1270 | { |
1271 | smp_mb(); | |
57acbaa7 | 1272 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1273 | } |
1274 | ||
5679c59f AE |
1275 | /* |
1276 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1277 | * flag. The latter is set based on the "exists" value provided. | |
1278 | * | |
1279 | * Note that for our purposes once an object exists it never goes | |
1280 | * away again. It's possible that the response from two existence | |
1281 | * checks are separated by the creation of the target object, and | |
1282 | * the first ("doesn't exist") response arrives *after* the second | |
1283 | * ("does exist"). In that case we ignore the second one. | |
1284 | */ | |
1285 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1286 | bool exists) | |
1287 | { | |
1288 | if (exists) | |
1289 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1290 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1291 | smp_mb(); | |
1292 | } | |
1293 | ||
1294 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1295 | { | |
1296 | smp_mb(); | |
1297 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1298 | } | |
1299 | ||
1300 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1301 | { | |
1302 | smp_mb(); | |
1303 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1304 | } | |
1305 | ||
bf0d5f50 AE |
1306 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1307 | { | |
37206ee5 AE |
1308 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1309 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1310 | kref_get(&obj_request->kref); |
1311 | } | |
1312 | ||
1313 | static void rbd_obj_request_destroy(struct kref *kref); | |
1314 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1315 | { | |
1316 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1317 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1318 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1319 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1320 | } | |
1321 | ||
1322 | static void rbd_img_request_get(struct rbd_img_request *img_request) | |
1323 | { | |
37206ee5 AE |
1324 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1325 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1326 | kref_get(&img_request->kref); |
1327 | } | |
1328 | ||
1329 | static void rbd_img_request_destroy(struct kref *kref); | |
1330 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1331 | { | |
1332 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1333 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1334 | atomic_read(&img_request->kref.refcount)); | |
bf0d5f50 AE |
1335 | kref_put(&img_request->kref, rbd_img_request_destroy); |
1336 | } | |
1337 | ||
1338 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1339 | struct rbd_obj_request *obj_request) | |
1340 | { | |
25dcf954 AE |
1341 | rbd_assert(obj_request->img_request == NULL); |
1342 | ||
b155e86c | 1343 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1344 | obj_request->img_request = img_request; |
25dcf954 | 1345 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1346 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1347 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1348 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1349 | img_request->obj_request_count++; |
1350 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1351 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1352 | obj_request->which); | |
bf0d5f50 AE |
1353 | } |
1354 | ||
1355 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1356 | struct rbd_obj_request *obj_request) | |
1357 | { | |
1358 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1359 | |
37206ee5 AE |
1360 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1361 | obj_request->which); | |
bf0d5f50 | 1362 | list_del(&obj_request->links); |
25dcf954 AE |
1363 | rbd_assert(img_request->obj_request_count > 0); |
1364 | img_request->obj_request_count--; | |
1365 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1366 | obj_request->which = BAD_WHICH; | |
6365d33a | 1367 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1368 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1369 | obj_request->img_request = NULL; |
25dcf954 | 1370 | obj_request->callback = NULL; |
bf0d5f50 AE |
1371 | rbd_obj_request_put(obj_request); |
1372 | } | |
1373 | ||
1374 | static bool obj_request_type_valid(enum obj_request_type type) | |
1375 | { | |
1376 | switch (type) { | |
9969ebc5 | 1377 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1378 | case OBJ_REQUEST_BIO: |
788e2df3 | 1379 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1380 | return true; |
1381 | default: | |
1382 | return false; | |
1383 | } | |
1384 | } | |
1385 | ||
bf0d5f50 AE |
1386 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1387 | struct rbd_obj_request *obj_request) | |
1388 | { | |
37206ee5 AE |
1389 | dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request); |
1390 | ||
bf0d5f50 AE |
1391 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1392 | } | |
1393 | ||
1394 | static void rbd_img_request_complete(struct rbd_img_request *img_request) | |
1395 | { | |
55f27e09 | 1396 | |
37206ee5 | 1397 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1398 | |
1399 | /* | |
1400 | * If no error occurred, compute the aggregate transfer | |
1401 | * count for the image request. We could instead use | |
1402 | * atomic64_cmpxchg() to update it as each object request | |
1403 | * completes; not clear which way is better off hand. | |
1404 | */ | |
1405 | if (!img_request->result) { | |
1406 | struct rbd_obj_request *obj_request; | |
1407 | u64 xferred = 0; | |
1408 | ||
1409 | for_each_obj_request(img_request, obj_request) | |
1410 | xferred += obj_request->xferred; | |
1411 | img_request->xferred = xferred; | |
1412 | } | |
1413 | ||
bf0d5f50 AE |
1414 | if (img_request->callback) |
1415 | img_request->callback(img_request); | |
1416 | else | |
1417 | rbd_img_request_put(img_request); | |
1418 | } | |
1419 | ||
788e2df3 AE |
1420 | /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
1421 | ||
1422 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1423 | { | |
37206ee5 AE |
1424 | dout("%s: obj %p\n", __func__, obj_request); |
1425 | ||
788e2df3 AE |
1426 | return wait_for_completion_interruptible(&obj_request->completion); |
1427 | } | |
1428 | ||
0c425248 AE |
1429 | /* |
1430 | * The default/initial value for all image request flags is 0. Each | |
1431 | * is conditionally set to 1 at image request initialization time | |
1432 | * and currently never change thereafter. | |
1433 | */ | |
1434 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1435 | { | |
1436 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1437 | smp_mb(); | |
1438 | } | |
1439 | ||
1440 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1441 | { | |
1442 | smp_mb(); | |
1443 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1444 | } | |
1445 | ||
9849e986 AE |
1446 | static void img_request_child_set(struct rbd_img_request *img_request) |
1447 | { | |
1448 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1449 | smp_mb(); | |
1450 | } | |
1451 | ||
1452 | static bool img_request_child_test(struct rbd_img_request *img_request) | |
1453 | { | |
1454 | smp_mb(); | |
1455 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1456 | } | |
1457 | ||
d0b2e944 AE |
1458 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1459 | { | |
1460 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1461 | smp_mb(); | |
1462 | } | |
1463 | ||
1464 | static bool img_request_layered_test(struct rbd_img_request *img_request) | |
1465 | { | |
1466 | smp_mb(); | |
1467 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1468 | } | |
1469 | ||
6e2a4505 AE |
1470 | static void |
1471 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1472 | { | |
b9434c5b AE |
1473 | u64 xferred = obj_request->xferred; |
1474 | u64 length = obj_request->length; | |
1475 | ||
6e2a4505 AE |
1476 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1477 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1478 | xferred, length); |
6e2a4505 AE |
1479 | /* |
1480 | * ENOENT means a hole in the image. We zero-fill the | |
1481 | * entire length of the request. A short read also implies | |
1482 | * zero-fill to the end of the request. Either way we | |
1483 | * update the xferred count to indicate the whole request | |
1484 | * was satisfied. | |
1485 | */ | |
b9434c5b | 1486 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1487 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1488 | if (obj_request->type == OBJ_REQUEST_BIO) |
1489 | zero_bio_chain(obj_request->bio_list, 0); | |
1490 | else | |
1491 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1492 | obj_request->result = 0; |
b9434c5b AE |
1493 | obj_request->xferred = length; |
1494 | } else if (xferred < length && !obj_request->result) { | |
1495 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1496 | zero_bio_chain(obj_request->bio_list, xferred); | |
1497 | else | |
1498 | zero_pages(obj_request->pages, xferred, length); | |
1499 | obj_request->xferred = length; | |
6e2a4505 AE |
1500 | } |
1501 | obj_request_done_set(obj_request); | |
1502 | } | |
1503 | ||
bf0d5f50 AE |
1504 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1505 | { | |
37206ee5 AE |
1506 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1507 | obj_request->callback); | |
bf0d5f50 AE |
1508 | if (obj_request->callback) |
1509 | obj_request->callback(obj_request); | |
788e2df3 AE |
1510 | else |
1511 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1512 | } |
1513 | ||
c47f9371 | 1514 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1515 | { |
1516 | dout("%s: obj %p\n", __func__, obj_request); | |
1517 | obj_request_done_set(obj_request); | |
1518 | } | |
1519 | ||
c47f9371 | 1520 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1521 | { |
57acbaa7 | 1522 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1523 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1524 | bool layered = false; |
1525 | ||
1526 | if (obj_request_img_data_test(obj_request)) { | |
1527 | img_request = obj_request->img_request; | |
1528 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1529 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1530 | } |
8b3e1a56 AE |
1531 | |
1532 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1533 | obj_request, img_request, obj_request->result, | |
1534 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1535 | if (layered && obj_request->result == -ENOENT && |
1536 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1537 | rbd_img_parent_read(obj_request); |
1538 | else if (img_request) | |
6e2a4505 AE |
1539 | rbd_img_obj_request_read_callback(obj_request); |
1540 | else | |
1541 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1542 | } |
1543 | ||
c47f9371 | 1544 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1545 | { |
1b83bef2 SW |
1546 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1547 | obj_request->result, obj_request->length); | |
1548 | /* | |
8b3e1a56 AE |
1549 | * There is no such thing as a successful short write. Set |
1550 | * it to our originally-requested length. | |
1b83bef2 SW |
1551 | */ |
1552 | obj_request->xferred = obj_request->length; | |
07741308 | 1553 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1554 | } |
1555 | ||
fbfab539 AE |
1556 | /* |
1557 | * For a simple stat call there's nothing to do. We'll do more if | |
1558 | * this is part of a write sequence for a layered image. | |
1559 | */ | |
c47f9371 | 1560 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1561 | { |
37206ee5 | 1562 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1563 | obj_request_done_set(obj_request); |
1564 | } | |
1565 | ||
bf0d5f50 AE |
1566 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1567 | struct ceph_msg *msg) | |
1568 | { | |
1569 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1570 | u16 opcode; |
1571 | ||
37206ee5 | 1572 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1573 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1574 | if (obj_request_img_data_test(obj_request)) { |
1575 | rbd_assert(obj_request->img_request); | |
1576 | rbd_assert(obj_request->which != BAD_WHICH); | |
1577 | } else { | |
1578 | rbd_assert(obj_request->which == BAD_WHICH); | |
1579 | } | |
bf0d5f50 | 1580 | |
1b83bef2 SW |
1581 | if (osd_req->r_result < 0) |
1582 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1583 | |
0eefd470 | 1584 | BUG_ON(osd_req->r_num_ops > 2); |
bf0d5f50 | 1585 | |
c47f9371 AE |
1586 | /* |
1587 | * We support a 64-bit length, but ultimately it has to be | |
1588 | * passed to blk_end_request(), which takes an unsigned int. | |
1589 | */ | |
1b83bef2 | 1590 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1591 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
79528734 | 1592 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1593 | switch (opcode) { |
1594 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1595 | rbd_osd_read_callback(obj_request); |
bf0d5f50 AE |
1596 | break; |
1597 | case CEPH_OSD_OP_WRITE: | |
c47f9371 | 1598 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1599 | break; |
fbfab539 | 1600 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1601 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1602 | break; |
36be9a76 | 1603 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1604 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1605 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1606 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1607 | break; |
bf0d5f50 AE |
1608 | default: |
1609 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1610 | obj_request->object_name, (unsigned short) opcode); | |
1611 | break; | |
1612 | } | |
1613 | ||
07741308 | 1614 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1615 | rbd_obj_request_complete(obj_request); |
1616 | } | |
1617 | ||
9d4df01f | 1618 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1619 | { |
1620 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1621 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1622 | u64 snap_id; |
430c28c3 | 1623 | |
8c042b0d | 1624 | rbd_assert(osd_req != NULL); |
430c28c3 | 1625 | |
9d4df01f | 1626 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1627 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1628 | NULL, snap_id, NULL); |
1629 | } | |
1630 | ||
1631 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1632 | { | |
1633 | struct rbd_img_request *img_request = obj_request->img_request; | |
1634 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1635 | struct ceph_snap_context *snapc; | |
1636 | struct timespec mtime = CURRENT_TIME; | |
1637 | ||
1638 | rbd_assert(osd_req != NULL); | |
1639 | ||
1640 | snapc = img_request ? img_request->snapc : NULL; | |
1641 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1642 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1643 | } |
1644 | ||
bf0d5f50 AE |
1645 | static struct ceph_osd_request *rbd_osd_req_create( |
1646 | struct rbd_device *rbd_dev, | |
1647 | bool write_request, | |
430c28c3 | 1648 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1649 | { |
bf0d5f50 AE |
1650 | struct ceph_snap_context *snapc = NULL; |
1651 | struct ceph_osd_client *osdc; | |
1652 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1653 | |
6365d33a AE |
1654 | if (obj_request_img_data_test(obj_request)) { |
1655 | struct rbd_img_request *img_request = obj_request->img_request; | |
1656 | ||
0c425248 AE |
1657 | rbd_assert(write_request == |
1658 | img_request_write_test(img_request)); | |
1659 | if (write_request) | |
bf0d5f50 | 1660 | snapc = img_request->snapc; |
bf0d5f50 AE |
1661 | } |
1662 | ||
1663 | /* Allocate and initialize the request, for the single op */ | |
1664 | ||
1665 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1666 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); | |
1667 | if (!osd_req) | |
1668 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1669 | |
430c28c3 | 1670 | if (write_request) |
bf0d5f50 | 1671 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1672 | else |
bf0d5f50 | 1673 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1674 | |
1675 | osd_req->r_callback = rbd_osd_req_callback; | |
1676 | osd_req->r_priv = obj_request; | |
1677 | ||
1678 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1679 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1680 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1681 | ||
1682 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1683 | ||
bf0d5f50 AE |
1684 | return osd_req; |
1685 | } | |
1686 | ||
0eefd470 AE |
1687 | /* |
1688 | * Create a copyup osd request based on the information in the | |
1689 | * object request supplied. A copyup request has two osd ops, | |
1690 | * a copyup method call, and a "normal" write request. | |
1691 | */ | |
1692 | static struct ceph_osd_request * | |
1693 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1694 | { | |
1695 | struct rbd_img_request *img_request; | |
1696 | struct ceph_snap_context *snapc; | |
1697 | struct rbd_device *rbd_dev; | |
1698 | struct ceph_osd_client *osdc; | |
1699 | struct ceph_osd_request *osd_req; | |
1700 | ||
1701 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1702 | img_request = obj_request->img_request; | |
1703 | rbd_assert(img_request); | |
1704 | rbd_assert(img_request_write_test(img_request)); | |
1705 | ||
1706 | /* Allocate and initialize the request, for the two ops */ | |
1707 | ||
1708 | snapc = img_request->snapc; | |
1709 | rbd_dev = img_request->rbd_dev; | |
1710 | osdc = &rbd_dev->rbd_client->client->osdc; | |
1711 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC); | |
1712 | if (!osd_req) | |
1713 | return NULL; /* ENOMEM */ | |
1714 | ||
1715 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1716 | osd_req->r_callback = rbd_osd_req_callback; | |
1717 | osd_req->r_priv = obj_request; | |
1718 | ||
1719 | osd_req->r_oid_len = strlen(obj_request->object_name); | |
1720 | rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); | |
1721 | memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); | |
1722 | ||
1723 | osd_req->r_file_layout = rbd_dev->layout; /* struct */ | |
1724 | ||
1725 | return osd_req; | |
1726 | } | |
1727 | ||
1728 | ||
bf0d5f50 AE |
1729 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1730 | { | |
1731 | ceph_osdc_put_request(osd_req); | |
1732 | } | |
1733 | ||
1734 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1735 | ||
1736 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1737 | u64 offset, u64 length, | |
1738 | enum obj_request_type type) | |
1739 | { | |
1740 | struct rbd_obj_request *obj_request; | |
1741 | size_t size; | |
1742 | char *name; | |
1743 | ||
1744 | rbd_assert(obj_request_type_valid(type)); | |
1745 | ||
1746 | size = strlen(object_name) + 1; | |
f907ad55 AE |
1747 | name = kmalloc(size, GFP_KERNEL); |
1748 | if (!name) | |
bf0d5f50 AE |
1749 | return NULL; |
1750 | ||
868311b1 | 1751 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL); |
f907ad55 AE |
1752 | if (!obj_request) { |
1753 | kfree(name); | |
1754 | return NULL; | |
1755 | } | |
1756 | ||
bf0d5f50 AE |
1757 | obj_request->object_name = memcpy(name, object_name, size); |
1758 | obj_request->offset = offset; | |
1759 | obj_request->length = length; | |
926f9b3f | 1760 | obj_request->flags = 0; |
bf0d5f50 AE |
1761 | obj_request->which = BAD_WHICH; |
1762 | obj_request->type = type; | |
1763 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1764 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1765 | kref_init(&obj_request->kref); |
1766 | ||
37206ee5 AE |
1767 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1768 | offset, length, (int)type, obj_request); | |
1769 | ||
bf0d5f50 AE |
1770 | return obj_request; |
1771 | } | |
1772 | ||
1773 | static void rbd_obj_request_destroy(struct kref *kref) | |
1774 | { | |
1775 | struct rbd_obj_request *obj_request; | |
1776 | ||
1777 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1778 | ||
37206ee5 AE |
1779 | dout("%s: obj %p\n", __func__, obj_request); |
1780 | ||
bf0d5f50 AE |
1781 | rbd_assert(obj_request->img_request == NULL); |
1782 | rbd_assert(obj_request->which == BAD_WHICH); | |
1783 | ||
1784 | if (obj_request->osd_req) | |
1785 | rbd_osd_req_destroy(obj_request->osd_req); | |
1786 | ||
1787 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1788 | switch (obj_request->type) { | |
9969ebc5 AE |
1789 | case OBJ_REQUEST_NODATA: |
1790 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1791 | case OBJ_REQUEST_BIO: |
1792 | if (obj_request->bio_list) | |
1793 | bio_chain_put(obj_request->bio_list); | |
1794 | break; | |
788e2df3 AE |
1795 | case OBJ_REQUEST_PAGES: |
1796 | if (obj_request->pages) | |
1797 | ceph_release_page_vector(obj_request->pages, | |
1798 | obj_request->page_count); | |
1799 | break; | |
bf0d5f50 AE |
1800 | } |
1801 | ||
f907ad55 | 1802 | kfree(obj_request->object_name); |
868311b1 AE |
1803 | obj_request->object_name = NULL; |
1804 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
1805 | } |
1806 | ||
1807 | /* | |
1808 | * Caller is responsible for filling in the list of object requests | |
1809 | * that comprises the image request, and the Linux request pointer | |
1810 | * (if there is one). | |
1811 | */ | |
cc344fa1 AE |
1812 | static struct rbd_img_request *rbd_img_request_create( |
1813 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 1814 | u64 offset, u64 length, |
9849e986 AE |
1815 | bool write_request, |
1816 | bool child_request) | |
bf0d5f50 AE |
1817 | { |
1818 | struct rbd_img_request *img_request; | |
bf0d5f50 | 1819 | |
1c2a9dfe | 1820 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_ATOMIC); |
bf0d5f50 AE |
1821 | if (!img_request) |
1822 | return NULL; | |
1823 | ||
1824 | if (write_request) { | |
1825 | down_read(&rbd_dev->header_rwsem); | |
812164f8 | 1826 | ceph_get_snap_context(rbd_dev->header.snapc); |
bf0d5f50 | 1827 | up_read(&rbd_dev->header_rwsem); |
bf0d5f50 AE |
1828 | } |
1829 | ||
1830 | img_request->rq = NULL; | |
1831 | img_request->rbd_dev = rbd_dev; | |
1832 | img_request->offset = offset; | |
1833 | img_request->length = length; | |
0c425248 AE |
1834 | img_request->flags = 0; |
1835 | if (write_request) { | |
1836 | img_request_write_set(img_request); | |
468521c1 | 1837 | img_request->snapc = rbd_dev->header.snapc; |
0c425248 | 1838 | } else { |
bf0d5f50 | 1839 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 1840 | } |
9849e986 AE |
1841 | if (child_request) |
1842 | img_request_child_set(img_request); | |
d0b2e944 AE |
1843 | if (rbd_dev->parent_spec) |
1844 | img_request_layered_set(img_request); | |
bf0d5f50 AE |
1845 | spin_lock_init(&img_request->completion_lock); |
1846 | img_request->next_completion = 0; | |
1847 | img_request->callback = NULL; | |
a5a337d4 | 1848 | img_request->result = 0; |
bf0d5f50 AE |
1849 | img_request->obj_request_count = 0; |
1850 | INIT_LIST_HEAD(&img_request->obj_requests); | |
1851 | kref_init(&img_request->kref); | |
1852 | ||
1853 | rbd_img_request_get(img_request); /* Avoid a warning */ | |
1854 | rbd_img_request_put(img_request); /* TEMPORARY */ | |
1855 | ||
37206ee5 AE |
1856 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
1857 | write_request ? "write" : "read", offset, length, | |
1858 | img_request); | |
1859 | ||
bf0d5f50 AE |
1860 | return img_request; |
1861 | } | |
1862 | ||
1863 | static void rbd_img_request_destroy(struct kref *kref) | |
1864 | { | |
1865 | struct rbd_img_request *img_request; | |
1866 | struct rbd_obj_request *obj_request; | |
1867 | struct rbd_obj_request *next_obj_request; | |
1868 | ||
1869 | img_request = container_of(kref, struct rbd_img_request, kref); | |
1870 | ||
37206ee5 AE |
1871 | dout("%s: img %p\n", __func__, img_request); |
1872 | ||
bf0d5f50 AE |
1873 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
1874 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 1875 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 1876 | |
0c425248 | 1877 | if (img_request_write_test(img_request)) |
812164f8 | 1878 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 1879 | |
8b3e1a56 AE |
1880 | if (img_request_child_test(img_request)) |
1881 | rbd_obj_request_put(img_request->obj_request); | |
1882 | ||
1c2a9dfe | 1883 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
1884 | } |
1885 | ||
1217857f AE |
1886 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
1887 | { | |
6365d33a | 1888 | struct rbd_img_request *img_request; |
1217857f AE |
1889 | unsigned int xferred; |
1890 | int result; | |
8b3e1a56 | 1891 | bool more; |
1217857f | 1892 | |
6365d33a AE |
1893 | rbd_assert(obj_request_img_data_test(obj_request)); |
1894 | img_request = obj_request->img_request; | |
1895 | ||
1217857f AE |
1896 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
1897 | xferred = (unsigned int)obj_request->xferred; | |
1898 | result = obj_request->result; | |
1899 | if (result) { | |
1900 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1901 | ||
1902 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
1903 | img_request_write_test(img_request) ? "write" : "read", | |
1904 | obj_request->length, obj_request->img_offset, | |
1905 | obj_request->offset); | |
1906 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
1907 | result, xferred); | |
1908 | if (!img_request->result) | |
1909 | img_request->result = result; | |
1910 | } | |
1911 | ||
f1a4739f AE |
1912 | /* Image object requests don't own their page array */ |
1913 | ||
1914 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
1915 | obj_request->pages = NULL; | |
1916 | obj_request->page_count = 0; | |
1917 | } | |
1918 | ||
8b3e1a56 AE |
1919 | if (img_request_child_test(img_request)) { |
1920 | rbd_assert(img_request->obj_request != NULL); | |
1921 | more = obj_request->which < img_request->obj_request_count - 1; | |
1922 | } else { | |
1923 | rbd_assert(img_request->rq != NULL); | |
1924 | more = blk_end_request(img_request->rq, result, xferred); | |
1925 | } | |
1926 | ||
1927 | return more; | |
1217857f AE |
1928 | } |
1929 | ||
2169238d AE |
1930 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
1931 | { | |
1932 | struct rbd_img_request *img_request; | |
1933 | u32 which = obj_request->which; | |
1934 | bool more = true; | |
1935 | ||
6365d33a | 1936 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
1937 | img_request = obj_request->img_request; |
1938 | ||
1939 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
1940 | rbd_assert(img_request != NULL); | |
2169238d AE |
1941 | rbd_assert(img_request->obj_request_count > 0); |
1942 | rbd_assert(which != BAD_WHICH); | |
1943 | rbd_assert(which < img_request->obj_request_count); | |
1944 | rbd_assert(which >= img_request->next_completion); | |
1945 | ||
1946 | spin_lock_irq(&img_request->completion_lock); | |
1947 | if (which != img_request->next_completion) | |
1948 | goto out; | |
1949 | ||
1950 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
1951 | rbd_assert(more); |
1952 | rbd_assert(which < img_request->obj_request_count); | |
1953 | ||
1954 | if (!obj_request_done_test(obj_request)) | |
1955 | break; | |
1217857f | 1956 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
1957 | which++; |
1958 | } | |
1959 | ||
1960 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
1961 | img_request->next_completion = which; | |
1962 | out: | |
1963 | spin_unlock_irq(&img_request->completion_lock); | |
1964 | ||
1965 | if (!more) | |
1966 | rbd_img_request_complete(img_request); | |
1967 | } | |
1968 | ||
f1a4739f AE |
1969 | /* |
1970 | * Split up an image request into one or more object requests, each | |
1971 | * to a different object. The "type" parameter indicates whether | |
1972 | * "data_desc" is the pointer to the head of a list of bio | |
1973 | * structures, or the base of a page array. In either case this | |
1974 | * function assumes data_desc describes memory sufficient to hold | |
1975 | * all data described by the image request. | |
1976 | */ | |
1977 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
1978 | enum obj_request_type type, | |
1979 | void *data_desc) | |
bf0d5f50 AE |
1980 | { |
1981 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
1982 | struct rbd_obj_request *obj_request = NULL; | |
1983 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 1984 | bool write_request = img_request_write_test(img_request); |
f1a4739f AE |
1985 | struct bio *bio_list; |
1986 | unsigned int bio_offset = 0; | |
1987 | struct page **pages; | |
7da22d29 | 1988 | u64 img_offset; |
bf0d5f50 AE |
1989 | u64 resid; |
1990 | u16 opcode; | |
1991 | ||
f1a4739f AE |
1992 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
1993 | (int)type, data_desc); | |
37206ee5 | 1994 | |
430c28c3 | 1995 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 1996 | img_offset = img_request->offset; |
bf0d5f50 | 1997 | resid = img_request->length; |
4dda41d3 | 1998 | rbd_assert(resid > 0); |
f1a4739f AE |
1999 | |
2000 | if (type == OBJ_REQUEST_BIO) { | |
2001 | bio_list = data_desc; | |
2002 | rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT); | |
2003 | } else { | |
2004 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
2005 | pages = data_desc; | |
2006 | } | |
2007 | ||
bf0d5f50 | 2008 | while (resid) { |
2fa12320 | 2009 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2010 | const char *object_name; |
bf0d5f50 AE |
2011 | u64 offset; |
2012 | u64 length; | |
2013 | ||
7da22d29 | 2014 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2015 | if (!object_name) |
2016 | goto out_unwind; | |
7da22d29 AE |
2017 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2018 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2019 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2020 | offset, length, type); |
78c2a44a AE |
2021 | /* object request has its own copy of the object name */ |
2022 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2023 | if (!obj_request) |
2024 | goto out_unwind; | |
2025 | ||
f1a4739f AE |
2026 | if (type == OBJ_REQUEST_BIO) { |
2027 | unsigned int clone_size; | |
2028 | ||
2029 | rbd_assert(length <= (u64)UINT_MAX); | |
2030 | clone_size = (unsigned int)length; | |
2031 | obj_request->bio_list = | |
2032 | bio_chain_clone_range(&bio_list, | |
2033 | &bio_offset, | |
2034 | clone_size, | |
2035 | GFP_ATOMIC); | |
2036 | if (!obj_request->bio_list) | |
2037 | goto out_partial; | |
2038 | } else { | |
2039 | unsigned int page_count; | |
2040 | ||
2041 | obj_request->pages = pages; | |
2042 | page_count = (u32)calc_pages_for(offset, length); | |
2043 | obj_request->page_count = page_count; | |
2044 | if ((offset + length) & ~PAGE_MASK) | |
2045 | page_count--; /* more on last page */ | |
2046 | pages += page_count; | |
2047 | } | |
bf0d5f50 | 2048 | |
2fa12320 AE |
2049 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
2050 | obj_request); | |
2051 | if (!osd_req) | |
bf0d5f50 | 2052 | goto out_partial; |
2fa12320 | 2053 | obj_request->osd_req = osd_req; |
2169238d | 2054 | obj_request->callback = rbd_img_obj_callback; |
430c28c3 | 2055 | |
2fa12320 AE |
2056 | osd_req_op_extent_init(osd_req, 0, opcode, offset, length, |
2057 | 0, 0); | |
f1a4739f AE |
2058 | if (type == OBJ_REQUEST_BIO) |
2059 | osd_req_op_extent_osd_data_bio(osd_req, 0, | |
2060 | obj_request->bio_list, length); | |
2061 | else | |
2062 | osd_req_op_extent_osd_data_pages(osd_req, 0, | |
2063 | obj_request->pages, length, | |
2064 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
2065 | |
2066 | if (write_request) | |
2067 | rbd_osd_req_format_write(obj_request); | |
2068 | else | |
2069 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 2070 | |
7da22d29 | 2071 | obj_request->img_offset = img_offset; |
bf0d5f50 AE |
2072 | rbd_img_obj_request_add(img_request, obj_request); |
2073 | ||
7da22d29 | 2074 | img_offset += length; |
bf0d5f50 AE |
2075 | resid -= length; |
2076 | } | |
2077 | ||
2078 | return 0; | |
2079 | ||
2080 | out_partial: | |
2081 | rbd_obj_request_put(obj_request); | |
2082 | out_unwind: | |
2083 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
2084 | rbd_obj_request_put(obj_request); | |
2085 | ||
2086 | return -ENOMEM; | |
2087 | } | |
2088 | ||
0eefd470 AE |
2089 | static void |
2090 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2091 | { | |
2092 | struct rbd_img_request *img_request; | |
2093 | struct rbd_device *rbd_dev; | |
2094 | u64 length; | |
2095 | u32 page_count; | |
2096 | ||
2097 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2098 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2099 | img_request = obj_request->img_request; | |
2100 | rbd_assert(img_request); | |
2101 | ||
2102 | rbd_dev = img_request->rbd_dev; | |
2103 | rbd_assert(rbd_dev); | |
2104 | length = (u64)1 << rbd_dev->header.obj_order; | |
2105 | page_count = (u32)calc_pages_for(0, length); | |
2106 | ||
2107 | rbd_assert(obj_request->copyup_pages); | |
2108 | ceph_release_page_vector(obj_request->copyup_pages, page_count); | |
2109 | obj_request->copyup_pages = NULL; | |
2110 | ||
2111 | /* | |
2112 | * We want the transfer count to reflect the size of the | |
2113 | * original write request. There is no such thing as a | |
2114 | * successful short write, so if the request was successful | |
2115 | * we can just set it to the originally-requested length. | |
2116 | */ | |
2117 | if (!obj_request->result) | |
2118 | obj_request->xferred = obj_request->length; | |
2119 | ||
2120 | /* Finish up with the normal image object callback */ | |
2121 | ||
2122 | rbd_img_obj_callback(obj_request); | |
2123 | } | |
2124 | ||
3d7efd18 AE |
2125 | static void |
2126 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2127 | { | |
2128 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2129 | struct ceph_osd_request *osd_req; |
2130 | struct ceph_osd_client *osdc; | |
2131 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2132 | struct page **pages; |
3d7efd18 AE |
2133 | int result; |
2134 | u64 obj_size; | |
2135 | u64 xferred; | |
2136 | ||
2137 | rbd_assert(img_request_child_test(img_request)); | |
2138 | ||
2139 | /* First get what we need from the image request */ | |
2140 | ||
2141 | pages = img_request->copyup_pages; | |
2142 | rbd_assert(pages != NULL); | |
2143 | img_request->copyup_pages = NULL; | |
2144 | ||
2145 | orig_request = img_request->obj_request; | |
2146 | rbd_assert(orig_request != NULL); | |
0eefd470 | 2147 | rbd_assert(orig_request->type == OBJ_REQUEST_BIO); |
3d7efd18 AE |
2148 | result = img_request->result; |
2149 | obj_size = img_request->length; | |
2150 | xferred = img_request->xferred; | |
2151 | ||
0eefd470 AE |
2152 | rbd_dev = img_request->rbd_dev; |
2153 | rbd_assert(rbd_dev); | |
2154 | rbd_assert(obj_size == (u64)1 << rbd_dev->header.obj_order); | |
2155 | ||
3d7efd18 AE |
2156 | rbd_img_request_put(img_request); |
2157 | ||
0eefd470 AE |
2158 | if (result) |
2159 | goto out_err; | |
2160 | ||
2161 | /* Allocate the new copyup osd request for the original request */ | |
2162 | ||
2163 | result = -ENOMEM; | |
2164 | rbd_assert(!orig_request->osd_req); | |
2165 | osd_req = rbd_osd_req_create_copyup(orig_request); | |
2166 | if (!osd_req) | |
2167 | goto out_err; | |
2168 | orig_request->osd_req = osd_req; | |
2169 | orig_request->copyup_pages = pages; | |
3d7efd18 | 2170 | |
0eefd470 | 2171 | /* Initialize the copyup op */ |
3d7efd18 | 2172 | |
0eefd470 AE |
2173 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
2174 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, obj_size, 0, | |
2175 | false, false); | |
3d7efd18 | 2176 | |
0eefd470 AE |
2177 | /* Then the original write request op */ |
2178 | ||
2179 | osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE, | |
2180 | orig_request->offset, | |
2181 | orig_request->length, 0, 0); | |
2182 | osd_req_op_extent_osd_data_bio(osd_req, 1, orig_request->bio_list, | |
2183 | orig_request->length); | |
2184 | ||
2185 | rbd_osd_req_format_write(orig_request); | |
2186 | ||
2187 | /* All set, send it off. */ | |
2188 | ||
2189 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2190 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2191 | result = rbd_obj_request_submit(osdc, orig_request); | |
2192 | if (!result) | |
2193 | return; | |
2194 | out_err: | |
2195 | /* Record the error code and complete the request */ | |
2196 | ||
2197 | orig_request->result = result; | |
2198 | orig_request->xferred = 0; | |
2199 | obj_request_done_set(orig_request); | |
2200 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2201 | } |
2202 | ||
2203 | /* | |
2204 | * Read from the parent image the range of data that covers the | |
2205 | * entire target of the given object request. This is used for | |
2206 | * satisfying a layered image write request when the target of an | |
2207 | * object request from the image request does not exist. | |
2208 | * | |
2209 | * A page array big enough to hold the returned data is allocated | |
2210 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2211 | * When the read completes, this page array will be transferred to | |
2212 | * the original object request for the copyup operation. | |
2213 | * | |
2214 | * If an error occurs, record it as the result of the original | |
2215 | * object request and mark it done so it gets completed. | |
2216 | */ | |
2217 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2218 | { | |
2219 | struct rbd_img_request *img_request = NULL; | |
2220 | struct rbd_img_request *parent_request = NULL; | |
2221 | struct rbd_device *rbd_dev; | |
2222 | u64 img_offset; | |
2223 | u64 length; | |
2224 | struct page **pages = NULL; | |
2225 | u32 page_count; | |
2226 | int result; | |
2227 | ||
2228 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2229 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2230 | ||
2231 | img_request = obj_request->img_request; | |
2232 | rbd_assert(img_request != NULL); | |
2233 | rbd_dev = img_request->rbd_dev; | |
2234 | rbd_assert(rbd_dev->parent != NULL); | |
2235 | ||
0eefd470 AE |
2236 | /* |
2237 | * First things first. The original osd request is of no | |
2238 | * use to use any more, we'll need a new one that can hold | |
2239 | * the two ops in a copyup request. We'll get that later, | |
2240 | * but for now we can release the old one. | |
2241 | */ | |
2242 | rbd_osd_req_destroy(obj_request->osd_req); | |
2243 | obj_request->osd_req = NULL; | |
2244 | ||
3d7efd18 AE |
2245 | /* |
2246 | * Determine the byte range covered by the object in the | |
2247 | * child image to which the original request was to be sent. | |
2248 | */ | |
2249 | img_offset = obj_request->img_offset - obj_request->offset; | |
2250 | length = (u64)1 << rbd_dev->header.obj_order; | |
2251 | ||
a9e8ba2c AE |
2252 | /* |
2253 | * There is no defined parent data beyond the parent | |
2254 | * overlap, so limit what we read at that boundary if | |
2255 | * necessary. | |
2256 | */ | |
2257 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2258 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2259 | length = rbd_dev->parent_overlap - img_offset; | |
2260 | } | |
2261 | ||
3d7efd18 AE |
2262 | /* |
2263 | * Allocate a page array big enough to receive the data read | |
2264 | * from the parent. | |
2265 | */ | |
2266 | page_count = (u32)calc_pages_for(0, length); | |
2267 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2268 | if (IS_ERR(pages)) { | |
2269 | result = PTR_ERR(pages); | |
2270 | pages = NULL; | |
2271 | goto out_err; | |
2272 | } | |
2273 | ||
2274 | result = -ENOMEM; | |
2275 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2276 | img_offset, length, | |
2277 | false, true); | |
2278 | if (!parent_request) | |
2279 | goto out_err; | |
2280 | rbd_obj_request_get(obj_request); | |
2281 | parent_request->obj_request = obj_request; | |
2282 | ||
2283 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2284 | if (result) | |
2285 | goto out_err; | |
2286 | parent_request->copyup_pages = pages; | |
2287 | ||
2288 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2289 | result = rbd_img_request_submit(parent_request); | |
2290 | if (!result) | |
2291 | return 0; | |
2292 | ||
2293 | parent_request->copyup_pages = NULL; | |
2294 | parent_request->obj_request = NULL; | |
2295 | rbd_obj_request_put(obj_request); | |
2296 | out_err: | |
2297 | if (pages) | |
2298 | ceph_release_page_vector(pages, page_count); | |
2299 | if (parent_request) | |
2300 | rbd_img_request_put(parent_request); | |
2301 | obj_request->result = result; | |
2302 | obj_request->xferred = 0; | |
2303 | obj_request_done_set(obj_request); | |
2304 | ||
2305 | return result; | |
2306 | } | |
2307 | ||
c5b5ef6c AE |
2308 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2309 | { | |
c5b5ef6c AE |
2310 | struct rbd_obj_request *orig_request; |
2311 | int result; | |
2312 | ||
2313 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2314 | ||
2315 | /* | |
2316 | * All we need from the object request is the original | |
2317 | * request and the result of the STAT op. Grab those, then | |
2318 | * we're done with the request. | |
2319 | */ | |
2320 | orig_request = obj_request->obj_request; | |
2321 | obj_request->obj_request = NULL; | |
2322 | rbd_assert(orig_request); | |
2323 | rbd_assert(orig_request->img_request); | |
2324 | ||
2325 | result = obj_request->result; | |
2326 | obj_request->result = 0; | |
2327 | ||
2328 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2329 | obj_request, orig_request, result, | |
2330 | obj_request->xferred, obj_request->length); | |
2331 | rbd_obj_request_put(obj_request); | |
2332 | ||
2333 | rbd_assert(orig_request); | |
2334 | rbd_assert(orig_request->img_request); | |
c5b5ef6c AE |
2335 | |
2336 | /* | |
2337 | * Our only purpose here is to determine whether the object | |
2338 | * exists, and we don't want to treat the non-existence as | |
2339 | * an error. If something else comes back, transfer the | |
2340 | * error to the original request and complete it now. | |
2341 | */ | |
2342 | if (!result) { | |
2343 | obj_request_existence_set(orig_request, true); | |
2344 | } else if (result == -ENOENT) { | |
2345 | obj_request_existence_set(orig_request, false); | |
2346 | } else if (result) { | |
2347 | orig_request->result = result; | |
3d7efd18 | 2348 | goto out; |
c5b5ef6c AE |
2349 | } |
2350 | ||
2351 | /* | |
2352 | * Resubmit the original request now that we have recorded | |
2353 | * whether the target object exists. | |
2354 | */ | |
b454e36d | 2355 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2356 | out: |
c5b5ef6c AE |
2357 | if (orig_request->result) |
2358 | rbd_obj_request_complete(orig_request); | |
2359 | rbd_obj_request_put(orig_request); | |
2360 | } | |
2361 | ||
2362 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2363 | { | |
2364 | struct rbd_obj_request *stat_request; | |
2365 | struct rbd_device *rbd_dev; | |
2366 | struct ceph_osd_client *osdc; | |
2367 | struct page **pages = NULL; | |
2368 | u32 page_count; | |
2369 | size_t size; | |
2370 | int ret; | |
2371 | ||
2372 | /* | |
2373 | * The response data for a STAT call consists of: | |
2374 | * le64 length; | |
2375 | * struct { | |
2376 | * le32 tv_sec; | |
2377 | * le32 tv_nsec; | |
2378 | * } mtime; | |
2379 | */ | |
2380 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2381 | page_count = (u32)calc_pages_for(0, size); | |
2382 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2383 | if (IS_ERR(pages)) | |
2384 | return PTR_ERR(pages); | |
2385 | ||
2386 | ret = -ENOMEM; | |
2387 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2388 | OBJ_REQUEST_PAGES); | |
2389 | if (!stat_request) | |
2390 | goto out; | |
2391 | ||
2392 | rbd_obj_request_get(obj_request); | |
2393 | stat_request->obj_request = obj_request; | |
2394 | stat_request->pages = pages; | |
2395 | stat_request->page_count = page_count; | |
2396 | ||
2397 | rbd_assert(obj_request->img_request); | |
2398 | rbd_dev = obj_request->img_request->rbd_dev; | |
2399 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, | |
2400 | stat_request); | |
2401 | if (!stat_request->osd_req) | |
2402 | goto out; | |
2403 | stat_request->callback = rbd_img_obj_exists_callback; | |
2404 | ||
2405 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2406 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2407 | false, false); | |
9d4df01f | 2408 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2409 | |
2410 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2411 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2412 | out: | |
2413 | if (ret) | |
2414 | rbd_obj_request_put(obj_request); | |
2415 | ||
2416 | return ret; | |
2417 | } | |
2418 | ||
b454e36d AE |
2419 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2420 | { | |
2421 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2422 | struct rbd_device *rbd_dev; |
3d7efd18 | 2423 | bool known; |
b454e36d AE |
2424 | |
2425 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2426 | ||
2427 | img_request = obj_request->img_request; | |
2428 | rbd_assert(img_request); | |
a9e8ba2c | 2429 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2430 | |
b454e36d | 2431 | /* |
a9e8ba2c AE |
2432 | * Only writes to layered images need special handling. |
2433 | * Reads and non-layered writes are simple object requests. | |
2434 | * Layered writes that start beyond the end of the overlap | |
2435 | * with the parent have no parent data, so they too are | |
2436 | * simple object requests. Finally, if the target object is | |
2437 | * known to already exist, its parent data has already been | |
2438 | * copied, so a write to the object can also be handled as a | |
2439 | * simple object request. | |
b454e36d AE |
2440 | */ |
2441 | if (!img_request_write_test(img_request) || | |
2442 | !img_request_layered_test(img_request) || | |
a9e8ba2c | 2443 | rbd_dev->parent_overlap <= obj_request->img_offset || |
3d7efd18 AE |
2444 | ((known = obj_request_known_test(obj_request)) && |
2445 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2446 | |
2447 | struct rbd_device *rbd_dev; | |
2448 | struct ceph_osd_client *osdc; | |
2449 | ||
2450 | rbd_dev = obj_request->img_request->rbd_dev; | |
2451 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2452 | ||
2453 | return rbd_obj_request_submit(osdc, obj_request); | |
2454 | } | |
2455 | ||
2456 | /* | |
3d7efd18 AE |
2457 | * It's a layered write. The target object might exist but |
2458 | * we may not know that yet. If we know it doesn't exist, | |
2459 | * start by reading the data for the full target object from | |
2460 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2461 | */ |
3d7efd18 AE |
2462 | if (known) |
2463 | return rbd_img_obj_parent_read_full(obj_request); | |
2464 | ||
2465 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2466 | |
2467 | return rbd_img_obj_exists_submit(obj_request); | |
2468 | } | |
2469 | ||
bf0d5f50 AE |
2470 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2471 | { | |
bf0d5f50 | 2472 | struct rbd_obj_request *obj_request; |
46faeed4 | 2473 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2474 | |
37206ee5 | 2475 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2476 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2477 | int ret; |
2478 | ||
b454e36d | 2479 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2480 | if (ret) |
2481 | return ret; | |
bf0d5f50 AE |
2482 | } |
2483 | ||
2484 | return 0; | |
2485 | } | |
8b3e1a56 AE |
2486 | |
2487 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2488 | { | |
2489 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2490 | struct rbd_device *rbd_dev; |
2491 | u64 obj_end; | |
8b3e1a56 AE |
2492 | |
2493 | rbd_assert(img_request_child_test(img_request)); | |
2494 | ||
2495 | obj_request = img_request->obj_request; | |
a9e8ba2c AE |
2496 | rbd_assert(obj_request); |
2497 | rbd_assert(obj_request->img_request); | |
2498 | ||
8b3e1a56 | 2499 | obj_request->result = img_request->result; |
a9e8ba2c AE |
2500 | if (obj_request->result) |
2501 | goto out; | |
2502 | ||
2503 | /* | |
2504 | * We need to zero anything beyond the parent overlap | |
2505 | * boundary. Since rbd_img_obj_request_read_callback() | |
2506 | * will zero anything beyond the end of a short read, an | |
2507 | * easy way to do this is to pretend the data from the | |
2508 | * parent came up short--ending at the overlap boundary. | |
2509 | */ | |
2510 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2511 | obj_end = obj_request->img_offset + obj_request->length; | |
2512 | rbd_dev = obj_request->img_request->rbd_dev; | |
2513 | if (obj_end > rbd_dev->parent_overlap) { | |
2514 | u64 xferred = 0; | |
2515 | ||
2516 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2517 | xferred = rbd_dev->parent_overlap - | |
2518 | obj_request->img_offset; | |
8b3e1a56 | 2519 | |
a9e8ba2c AE |
2520 | obj_request->xferred = min(img_request->xferred, xferred); |
2521 | } else { | |
2522 | obj_request->xferred = img_request->xferred; | |
2523 | } | |
2524 | out: | |
b5b09be3 | 2525 | rbd_img_request_put(img_request); |
8b3e1a56 AE |
2526 | rbd_img_obj_request_read_callback(obj_request); |
2527 | rbd_obj_request_complete(obj_request); | |
2528 | } | |
2529 | ||
2530 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2531 | { | |
2532 | struct rbd_device *rbd_dev; | |
2533 | struct rbd_img_request *img_request; | |
2534 | int result; | |
2535 | ||
2536 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2537 | rbd_assert(obj_request->img_request != NULL); | |
2538 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
2539 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2540 | ||
2541 | rbd_dev = obj_request->img_request->rbd_dev; | |
2542 | rbd_assert(rbd_dev->parent != NULL); | |
2543 | /* rbd_read_finish(obj_request, obj_request->length); */ | |
2544 | img_request = rbd_img_request_create(rbd_dev->parent, | |
2545 | obj_request->img_offset, | |
2546 | obj_request->length, | |
2547 | false, true); | |
2548 | result = -ENOMEM; | |
2549 | if (!img_request) | |
2550 | goto out_err; | |
2551 | ||
2552 | rbd_obj_request_get(obj_request); | |
2553 | img_request->obj_request = obj_request; | |
2554 | ||
f1a4739f AE |
2555 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2556 | obj_request->bio_list); | |
8b3e1a56 AE |
2557 | if (result) |
2558 | goto out_err; | |
2559 | ||
2560 | img_request->callback = rbd_img_parent_read_callback; | |
2561 | result = rbd_img_request_submit(img_request); | |
2562 | if (result) | |
2563 | goto out_err; | |
2564 | ||
2565 | return; | |
2566 | out_err: | |
2567 | if (img_request) | |
2568 | rbd_img_request_put(img_request); | |
2569 | obj_request->result = result; | |
2570 | obj_request->xferred = 0; | |
2571 | obj_request_done_set(obj_request); | |
2572 | } | |
bf0d5f50 | 2573 | |
cc4a38bd | 2574 | static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2575 | { |
2576 | struct rbd_obj_request *obj_request; | |
2169238d | 2577 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2578 | int ret; |
2579 | ||
2580 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2581 | OBJ_REQUEST_NODATA); | |
2582 | if (!obj_request) | |
2583 | return -ENOMEM; | |
2584 | ||
2585 | ret = -ENOMEM; | |
430c28c3 | 2586 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
b8d70035 AE |
2587 | if (!obj_request->osd_req) |
2588 | goto out; | |
2169238d | 2589 | obj_request->callback = rbd_obj_request_put; |
b8d70035 | 2590 | |
c99d2d4a | 2591 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2592 | notify_id, 0, 0); |
9d4df01f | 2593 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2594 | |
b8d70035 | 2595 | ret = rbd_obj_request_submit(osdc, obj_request); |
b8d70035 | 2596 | out: |
cf81b60e AE |
2597 | if (ret) |
2598 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2599 | |
2600 | return ret; | |
2601 | } | |
2602 | ||
2603 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2604 | { | |
2605 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
e627db08 | 2606 | int ret; |
b8d70035 AE |
2607 | |
2608 | if (!rbd_dev) | |
2609 | return; | |
2610 | ||
37206ee5 | 2611 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2612 | rbd_dev->header_name, (unsigned long long)notify_id, |
2613 | (unsigned int)opcode); | |
e627db08 AE |
2614 | ret = rbd_dev_refresh(rbd_dev); |
2615 | if (ret) | |
2616 | rbd_warn(rbd_dev, ": header refresh error (%d)\n", ret); | |
b8d70035 | 2617 | |
cc4a38bd | 2618 | rbd_obj_notify_ack(rbd_dev, notify_id); |
b8d70035 AE |
2619 | } |
2620 | ||
9969ebc5 AE |
2621 | /* |
2622 | * Request sync osd watch/unwatch. The value of "start" determines | |
2623 | * whether a watch request is being initiated or torn down. | |
2624 | */ | |
2625 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) | |
2626 | { | |
2627 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2628 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2629 | int ret; |
2630 | ||
2631 | rbd_assert(start ^ !!rbd_dev->watch_event); | |
2632 | rbd_assert(start ^ !!rbd_dev->watch_request); | |
2633 | ||
2634 | if (start) { | |
3c663bbd | 2635 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
9969ebc5 AE |
2636 | &rbd_dev->watch_event); |
2637 | if (ret < 0) | |
2638 | return ret; | |
8eb87565 | 2639 | rbd_assert(rbd_dev->watch_event != NULL); |
9969ebc5 AE |
2640 | } |
2641 | ||
2642 | ret = -ENOMEM; | |
2643 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2644 | OBJ_REQUEST_NODATA); | |
2645 | if (!obj_request) | |
2646 | goto out_cancel; | |
2647 | ||
430c28c3 AE |
2648 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request); |
2649 | if (!obj_request->osd_req) | |
2650 | goto out_cancel; | |
2651 | ||
8eb87565 | 2652 | if (start) |
975241af | 2653 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
8eb87565 | 2654 | else |
6977c3f9 | 2655 | ceph_osdc_unregister_linger_request(osdc, |
975241af | 2656 | rbd_dev->watch_request->osd_req); |
2169238d AE |
2657 | |
2658 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
b21ebddd | 2659 | rbd_dev->watch_event->cookie, 0, start); |
9d4df01f | 2660 | rbd_osd_req_format_write(obj_request); |
2169238d | 2661 | |
9969ebc5 AE |
2662 | ret = rbd_obj_request_submit(osdc, obj_request); |
2663 | if (ret) | |
2664 | goto out_cancel; | |
2665 | ret = rbd_obj_request_wait(obj_request); | |
2666 | if (ret) | |
2667 | goto out_cancel; | |
9969ebc5 AE |
2668 | ret = obj_request->result; |
2669 | if (ret) | |
2670 | goto out_cancel; | |
2671 | ||
8eb87565 AE |
2672 | /* |
2673 | * A watch request is set to linger, so the underlying osd | |
2674 | * request won't go away until we unregister it. We retain | |
2675 | * a pointer to the object request during that time (in | |
2676 | * rbd_dev->watch_request), so we'll keep a reference to | |
2677 | * it. We'll drop that reference (below) after we've | |
2678 | * unregistered it. | |
2679 | */ | |
2680 | if (start) { | |
2681 | rbd_dev->watch_request = obj_request; | |
2682 | ||
2683 | return 0; | |
2684 | } | |
2685 | ||
2686 | /* We have successfully torn down the watch request */ | |
2687 | ||
2688 | rbd_obj_request_put(rbd_dev->watch_request); | |
2689 | rbd_dev->watch_request = NULL; | |
9969ebc5 AE |
2690 | out_cancel: |
2691 | /* Cancel the event if we're tearing down, or on error */ | |
2692 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
2693 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
2694 | if (obj_request) |
2695 | rbd_obj_request_put(obj_request); | |
2696 | ||
2697 | return ret; | |
2698 | } | |
2699 | ||
36be9a76 | 2700 | /* |
f40eb349 AE |
2701 | * Synchronous osd object method call. Returns the number of bytes |
2702 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
2703 | */ |
2704 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
2705 | const char *object_name, | |
2706 | const char *class_name, | |
2707 | const char *method_name, | |
4157976b | 2708 | const void *outbound, |
36be9a76 | 2709 | size_t outbound_size, |
4157976b | 2710 | void *inbound, |
e2a58ee5 | 2711 | size_t inbound_size) |
36be9a76 | 2712 | { |
2169238d | 2713 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 2714 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
2715 | struct page **pages; |
2716 | u32 page_count; | |
2717 | int ret; | |
2718 | ||
2719 | /* | |
6010a451 AE |
2720 | * Method calls are ultimately read operations. The result |
2721 | * should placed into the inbound buffer provided. They | |
2722 | * also supply outbound data--parameters for the object | |
2723 | * method. Currently if this is present it will be a | |
2724 | * snapshot id. | |
36be9a76 | 2725 | */ |
57385b51 | 2726 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
2727 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
2728 | if (IS_ERR(pages)) | |
2729 | return PTR_ERR(pages); | |
2730 | ||
2731 | ret = -ENOMEM; | |
6010a451 | 2732 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
2733 | OBJ_REQUEST_PAGES); |
2734 | if (!obj_request) | |
2735 | goto out; | |
2736 | ||
2737 | obj_request->pages = pages; | |
2738 | obj_request->page_count = page_count; | |
2739 | ||
430c28c3 | 2740 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
36be9a76 AE |
2741 | if (!obj_request->osd_req) |
2742 | goto out; | |
2743 | ||
c99d2d4a | 2744 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
2745 | class_name, method_name); |
2746 | if (outbound_size) { | |
2747 | struct ceph_pagelist *pagelist; | |
2748 | ||
2749 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
2750 | if (!pagelist) | |
2751 | goto out; | |
2752 | ||
2753 | ceph_pagelist_init(pagelist); | |
2754 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
2755 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
2756 | pagelist); | |
2757 | } | |
a4ce40a9 AE |
2758 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
2759 | obj_request->pages, inbound_size, | |
44cd188d | 2760 | 0, false, false); |
9d4df01f | 2761 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2762 | |
36be9a76 AE |
2763 | ret = rbd_obj_request_submit(osdc, obj_request); |
2764 | if (ret) | |
2765 | goto out; | |
2766 | ret = rbd_obj_request_wait(obj_request); | |
2767 | if (ret) | |
2768 | goto out; | |
2769 | ||
2770 | ret = obj_request->result; | |
2771 | if (ret < 0) | |
2772 | goto out; | |
57385b51 AE |
2773 | |
2774 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
2775 | ret = (int)obj_request->xferred; | |
903bb32e | 2776 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
2777 | out: |
2778 | if (obj_request) | |
2779 | rbd_obj_request_put(obj_request); | |
2780 | else | |
2781 | ceph_release_page_vector(pages, page_count); | |
2782 | ||
2783 | return ret; | |
2784 | } | |
2785 | ||
bf0d5f50 | 2786 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 2787 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
2788 | { |
2789 | struct rbd_device *rbd_dev = q->queuedata; | |
2790 | bool read_only = rbd_dev->mapping.read_only; | |
2791 | struct request *rq; | |
2792 | int result; | |
2793 | ||
2794 | while ((rq = blk_fetch_request(q))) { | |
2795 | bool write_request = rq_data_dir(rq) == WRITE; | |
2796 | struct rbd_img_request *img_request; | |
2797 | u64 offset; | |
2798 | u64 length; | |
2799 | ||
2800 | /* Ignore any non-FS requests that filter through. */ | |
2801 | ||
2802 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
2803 | dout("%s: non-fs request type %d\n", __func__, |
2804 | (int) rq->cmd_type); | |
2805 | __blk_end_request_all(rq, 0); | |
2806 | continue; | |
2807 | } | |
2808 | ||
2809 | /* Ignore/skip any zero-length requests */ | |
2810 | ||
2811 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
2812 | length = (u64) blk_rq_bytes(rq); | |
2813 | ||
2814 | if (!length) { | |
2815 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
2816 | __blk_end_request_all(rq, 0); |
2817 | continue; | |
2818 | } | |
2819 | ||
2820 | spin_unlock_irq(q->queue_lock); | |
2821 | ||
2822 | /* Disallow writes to a read-only device */ | |
2823 | ||
2824 | if (write_request) { | |
2825 | result = -EROFS; | |
2826 | if (read_only) | |
2827 | goto end_request; | |
2828 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
2829 | } | |
2830 | ||
6d292906 AE |
2831 | /* |
2832 | * Quit early if the mapped snapshot no longer | |
2833 | * exists. It's still possible the snapshot will | |
2834 | * have disappeared by the time our request arrives | |
2835 | * at the osd, but there's no sense in sending it if | |
2836 | * we already know. | |
2837 | */ | |
2838 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
2839 | dout("request for non-existent snapshot"); |
2840 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
2841 | result = -ENXIO; | |
2842 | goto end_request; | |
2843 | } | |
2844 | ||
bf0d5f50 | 2845 | result = -EINVAL; |
c0cd10db AE |
2846 | if (offset && length > U64_MAX - offset + 1) { |
2847 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n", | |
2848 | offset, length); | |
bf0d5f50 | 2849 | goto end_request; /* Shouldn't happen */ |
c0cd10db | 2850 | } |
bf0d5f50 | 2851 | |
00a653e2 AE |
2852 | result = -EIO; |
2853 | if (offset + length > rbd_dev->mapping.size) { | |
2854 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)\n", | |
2855 | offset, length, rbd_dev->mapping.size); | |
2856 | goto end_request; | |
2857 | } | |
2858 | ||
bf0d5f50 AE |
2859 | result = -ENOMEM; |
2860 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
9849e986 | 2861 | write_request, false); |
bf0d5f50 AE |
2862 | if (!img_request) |
2863 | goto end_request; | |
2864 | ||
2865 | img_request->rq = rq; | |
2866 | ||
f1a4739f AE |
2867 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
2868 | rq->bio); | |
bf0d5f50 AE |
2869 | if (!result) |
2870 | result = rbd_img_request_submit(img_request); | |
2871 | if (result) | |
2872 | rbd_img_request_put(img_request); | |
2873 | end_request: | |
2874 | spin_lock_irq(q->queue_lock); | |
2875 | if (result < 0) { | |
7da22d29 AE |
2876 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
2877 | write_request ? "write" : "read", | |
2878 | length, offset, result); | |
2879 | ||
bf0d5f50 AE |
2880 | __blk_end_request_all(rq, result); |
2881 | } | |
2882 | } | |
2883 | } | |
2884 | ||
602adf40 YS |
2885 | /* |
2886 | * a queue callback. Makes sure that we don't create a bio that spans across | |
2887 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 2888 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
2889 | */ |
2890 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
2891 | struct bio_vec *bvec) | |
2892 | { | |
2893 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
2894 | sector_t sector_offset; |
2895 | sector_t sectors_per_obj; | |
2896 | sector_t obj_sector_offset; | |
2897 | int ret; | |
2898 | ||
2899 | /* | |
2900 | * Find how far into its rbd object the partition-relative | |
2901 | * bio start sector is to offset relative to the enclosing | |
2902 | * device. | |
2903 | */ | |
2904 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
2905 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
2906 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
2907 | ||
2908 | /* | |
2909 | * Compute the number of bytes from that offset to the end | |
2910 | * of the object. Account for what's already used by the bio. | |
2911 | */ | |
2912 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
2913 | if (ret > bmd->bi_size) | |
2914 | ret -= bmd->bi_size; | |
2915 | else | |
2916 | ret = 0; | |
2917 | ||
2918 | /* | |
2919 | * Don't send back more than was asked for. And if the bio | |
2920 | * was empty, let the whole thing through because: "Note | |
2921 | * that a block device *must* allow a single page to be | |
2922 | * added to an empty bio." | |
2923 | */ | |
2924 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
2925 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
2926 | ret = (int) bvec->bv_len; | |
2927 | ||
2928 | return ret; | |
602adf40 YS |
2929 | } |
2930 | ||
2931 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
2932 | { | |
2933 | struct gendisk *disk = rbd_dev->disk; | |
2934 | ||
2935 | if (!disk) | |
2936 | return; | |
2937 | ||
a0cab924 AE |
2938 | rbd_dev->disk = NULL; |
2939 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 2940 | del_gendisk(disk); |
a0cab924 AE |
2941 | if (disk->queue) |
2942 | blk_cleanup_queue(disk->queue); | |
2943 | } | |
602adf40 YS |
2944 | put_disk(disk); |
2945 | } | |
2946 | ||
788e2df3 AE |
2947 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
2948 | const char *object_name, | |
7097f8df | 2949 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
2950 | |
2951 | { | |
2169238d | 2952 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 2953 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
2954 | struct page **pages = NULL; |
2955 | u32 page_count; | |
1ceae7ef | 2956 | size_t size; |
788e2df3 AE |
2957 | int ret; |
2958 | ||
2959 | page_count = (u32) calc_pages_for(offset, length); | |
2960 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2961 | if (IS_ERR(pages)) | |
2962 | ret = PTR_ERR(pages); | |
2963 | ||
2964 | ret = -ENOMEM; | |
2965 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 2966 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
2967 | if (!obj_request) |
2968 | goto out; | |
2969 | ||
2970 | obj_request->pages = pages; | |
2971 | obj_request->page_count = page_count; | |
2972 | ||
430c28c3 | 2973 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request); |
788e2df3 AE |
2974 | if (!obj_request->osd_req) |
2975 | goto out; | |
2976 | ||
c99d2d4a AE |
2977 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
2978 | offset, length, 0, 0); | |
406e2c9f | 2979 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 2980 | obj_request->pages, |
44cd188d AE |
2981 | obj_request->length, |
2982 | obj_request->offset & ~PAGE_MASK, | |
2983 | false, false); | |
9d4df01f | 2984 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2985 | |
788e2df3 AE |
2986 | ret = rbd_obj_request_submit(osdc, obj_request); |
2987 | if (ret) | |
2988 | goto out; | |
2989 | ret = rbd_obj_request_wait(obj_request); | |
2990 | if (ret) | |
2991 | goto out; | |
2992 | ||
2993 | ret = obj_request->result; | |
2994 | if (ret < 0) | |
2995 | goto out; | |
1ceae7ef AE |
2996 | |
2997 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
2998 | size = (size_t) obj_request->xferred; | |
903bb32e | 2999 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
3000 | rbd_assert(size <= (size_t)INT_MAX); |
3001 | ret = (int)size; | |
788e2df3 AE |
3002 | out: |
3003 | if (obj_request) | |
3004 | rbd_obj_request_put(obj_request); | |
3005 | else | |
3006 | ceph_release_page_vector(pages, page_count); | |
3007 | ||
3008 | return ret; | |
3009 | } | |
3010 | ||
602adf40 | 3011 | /* |
4156d998 AE |
3012 | * Read the complete header for the given rbd device. |
3013 | * | |
3014 | * Returns a pointer to a dynamically-allocated buffer containing | |
3015 | * the complete and validated header. Caller can pass the address | |
3016 | * of a variable that will be filled in with the version of the | |
3017 | * header object at the time it was read. | |
3018 | * | |
3019 | * Returns a pointer-coded errno if a failure occurs. | |
602adf40 | 3020 | */ |
4156d998 | 3021 | static struct rbd_image_header_ondisk * |
7097f8df | 3022 | rbd_dev_v1_header_read(struct rbd_device *rbd_dev) |
602adf40 | 3023 | { |
4156d998 | 3024 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3025 | u32 snap_count = 0; |
4156d998 AE |
3026 | u64 names_size = 0; |
3027 | u32 want_count; | |
3028 | int ret; | |
602adf40 | 3029 | |
00f1f36f | 3030 | /* |
4156d998 AE |
3031 | * The complete header will include an array of its 64-bit |
3032 | * snapshot ids, followed by the names of those snapshots as | |
3033 | * a contiguous block of NUL-terminated strings. Note that | |
3034 | * the number of snapshots could change by the time we read | |
3035 | * it in, in which case we re-read it. | |
00f1f36f | 3036 | */ |
4156d998 AE |
3037 | do { |
3038 | size_t size; | |
3039 | ||
3040 | kfree(ondisk); | |
3041 | ||
3042 | size = sizeof (*ondisk); | |
3043 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3044 | size += names_size; | |
3045 | ondisk = kmalloc(size, GFP_KERNEL); | |
3046 | if (!ondisk) | |
3047 | return ERR_PTR(-ENOMEM); | |
3048 | ||
788e2df3 | 3049 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 3050 | 0, size, ondisk); |
4156d998 AE |
3051 | if (ret < 0) |
3052 | goto out_err; | |
c0cd10db | 3053 | if ((size_t)ret < size) { |
4156d998 | 3054 | ret = -ENXIO; |
06ecc6cb AE |
3055 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3056 | size, ret); | |
4156d998 AE |
3057 | goto out_err; |
3058 | } | |
3059 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3060 | ret = -ENXIO; | |
06ecc6cb | 3061 | rbd_warn(rbd_dev, "invalid header"); |
4156d998 | 3062 | goto out_err; |
81e759fb | 3063 | } |
602adf40 | 3064 | |
4156d998 AE |
3065 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3066 | want_count = snap_count; | |
3067 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3068 | } while (snap_count != want_count); | |
00f1f36f | 3069 | |
4156d998 | 3070 | return ondisk; |
00f1f36f | 3071 | |
4156d998 AE |
3072 | out_err: |
3073 | kfree(ondisk); | |
3074 | ||
3075 | return ERR_PTR(ret); | |
3076 | } | |
3077 | ||
3078 | /* | |
3079 | * reload the ondisk the header | |
3080 | */ | |
3081 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
3082 | struct rbd_image_header *header) | |
3083 | { | |
3084 | struct rbd_image_header_ondisk *ondisk; | |
4156d998 | 3085 | int ret; |
602adf40 | 3086 | |
7097f8df | 3087 | ondisk = rbd_dev_v1_header_read(rbd_dev); |
4156d998 AE |
3088 | if (IS_ERR(ondisk)) |
3089 | return PTR_ERR(ondisk); | |
3090 | ret = rbd_header_from_disk(header, ondisk); | |
4156d998 AE |
3091 | kfree(ondisk); |
3092 | ||
3093 | return ret; | |
602adf40 YS |
3094 | } |
3095 | ||
602adf40 YS |
3096 | /* |
3097 | * only read the first part of the ondisk header, without the snaps info | |
3098 | */ | |
cc4a38bd | 3099 | static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev) |
602adf40 YS |
3100 | { |
3101 | int ret; | |
3102 | struct rbd_image_header h; | |
602adf40 | 3103 | |
46578dcd | 3104 | memset(&h, 0, sizeof (h)); |
602adf40 YS |
3105 | ret = rbd_read_header(rbd_dev, &h); |
3106 | if (ret < 0) | |
3107 | return ret; | |
3108 | ||
a51aa0c0 JD |
3109 | down_write(&rbd_dev->header_rwsem); |
3110 | ||
9478554a AE |
3111 | /* Update image size, and check for resize of mapped image */ |
3112 | rbd_dev->header.image_size = h.image_size; | |
29334ba4 AE |
3113 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) |
3114 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) | |
3115 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
9db4b3e3 | 3116 | |
849b4260 | 3117 | /* rbd_dev->header.object_prefix shouldn't change */ |
602adf40 | 3118 | kfree(rbd_dev->header.snap_sizes); |
849b4260 | 3119 | kfree(rbd_dev->header.snap_names); |
d1d25646 | 3120 | /* osd requests may still refer to snapc */ |
812164f8 | 3121 | ceph_put_snap_context(rbd_dev->header.snapc); |
602adf40 | 3122 | |
93a24e08 | 3123 | rbd_dev->header.image_size = h.image_size; |
602adf40 YS |
3124 | rbd_dev->header.snapc = h.snapc; |
3125 | rbd_dev->header.snap_names = h.snap_names; | |
3126 | rbd_dev->header.snap_sizes = h.snap_sizes; | |
849b4260 | 3127 | /* Free the extra copy of the object prefix */ |
c0cd10db AE |
3128 | if (strcmp(rbd_dev->header.object_prefix, h.object_prefix)) |
3129 | rbd_warn(rbd_dev, "object prefix changed (ignoring)"); | |
849b4260 AE |
3130 | kfree(h.object_prefix); |
3131 | ||
c666601a | 3132 | up_write(&rbd_dev->header_rwsem); |
602adf40 | 3133 | |
dfc5606d | 3134 | return ret; |
602adf40 YS |
3135 | } |
3136 | ||
15228ede AE |
3137 | /* |
3138 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3139 | * has disappeared from the (just updated) snapshot context. | |
3140 | */ | |
3141 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3142 | { | |
3143 | u64 snap_id; | |
3144 | ||
3145 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3146 | return; | |
3147 | ||
3148 | snap_id = rbd_dev->spec->snap_id; | |
3149 | if (snap_id == CEPH_NOSNAP) | |
3150 | return; | |
3151 | ||
3152 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3153 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3154 | } | |
3155 | ||
cc4a38bd | 3156 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3157 | { |
e627db08 | 3158 | u64 mapping_size; |
1fe5e993 AE |
3159 | int ret; |
3160 | ||
117973fb | 3161 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
e627db08 | 3162 | mapping_size = rbd_dev->mapping.size; |
1fe5e993 | 3163 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
117973fb | 3164 | if (rbd_dev->image_format == 1) |
cc4a38bd | 3165 | ret = rbd_dev_v1_refresh(rbd_dev); |
117973fb | 3166 | else |
cc4a38bd | 3167 | ret = rbd_dev_v2_refresh(rbd_dev); |
15228ede AE |
3168 | |
3169 | /* If it's a mapped snapshot, validate its EXISTS flag */ | |
3170 | ||
3171 | rbd_exists_validate(rbd_dev); | |
1fe5e993 | 3172 | mutex_unlock(&ctl_mutex); |
00a653e2 AE |
3173 | if (mapping_size != rbd_dev->mapping.size) { |
3174 | sector_t size; | |
3175 | ||
3176 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3177 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3178 | set_capacity(rbd_dev->disk, size); | |
a3fbe5d4 | 3179 | revalidate_disk(rbd_dev->disk); |
00a653e2 | 3180 | } |
1fe5e993 AE |
3181 | |
3182 | return ret; | |
3183 | } | |
3184 | ||
602adf40 YS |
3185 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3186 | { | |
3187 | struct gendisk *disk; | |
3188 | struct request_queue *q; | |
593a9e7b | 3189 | u64 segment_size; |
602adf40 | 3190 | |
602adf40 | 3191 | /* create gendisk info */ |
602adf40 YS |
3192 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); |
3193 | if (!disk) | |
1fcdb8aa | 3194 | return -ENOMEM; |
602adf40 | 3195 | |
f0f8cef5 | 3196 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3197 | rbd_dev->dev_id); |
602adf40 YS |
3198 | disk->major = rbd_dev->major; |
3199 | disk->first_minor = 0; | |
3200 | disk->fops = &rbd_bd_ops; | |
3201 | disk->private_data = rbd_dev; | |
3202 | ||
bf0d5f50 | 3203 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3204 | if (!q) |
3205 | goto out_disk; | |
029bcbd8 | 3206 | |
593a9e7b AE |
3207 | /* We use the default size, but let's be explicit about it. */ |
3208 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3209 | ||
029bcbd8 | 3210 | /* set io sizes to object size */ |
593a9e7b AE |
3211 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3212 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3213 | blk_queue_max_segment_size(q, segment_size); | |
3214 | blk_queue_io_min(q, segment_size); | |
3215 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3216 | |
602adf40 YS |
3217 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3218 | disk->queue = q; | |
3219 | ||
3220 | q->queuedata = rbd_dev; | |
3221 | ||
3222 | rbd_dev->disk = disk; | |
602adf40 | 3223 | |
602adf40 | 3224 | return 0; |
602adf40 YS |
3225 | out_disk: |
3226 | put_disk(disk); | |
1fcdb8aa AE |
3227 | |
3228 | return -ENOMEM; | |
602adf40 YS |
3229 | } |
3230 | ||
dfc5606d YS |
3231 | /* |
3232 | sysfs | |
3233 | */ | |
3234 | ||
593a9e7b AE |
3235 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3236 | { | |
3237 | return container_of(dev, struct rbd_device, dev); | |
3238 | } | |
3239 | ||
dfc5606d YS |
3240 | static ssize_t rbd_size_show(struct device *dev, |
3241 | struct device_attribute *attr, char *buf) | |
3242 | { | |
593a9e7b | 3243 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3244 | |
fc71d833 AE |
3245 | return sprintf(buf, "%llu\n", |
3246 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3247 | } |
3248 | ||
34b13184 AE |
3249 | /* |
3250 | * Note this shows the features for whatever's mapped, which is not | |
3251 | * necessarily the base image. | |
3252 | */ | |
3253 | static ssize_t rbd_features_show(struct device *dev, | |
3254 | struct device_attribute *attr, char *buf) | |
3255 | { | |
3256 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3257 | ||
3258 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3259 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3260 | } |
3261 | ||
dfc5606d YS |
3262 | static ssize_t rbd_major_show(struct device *dev, |
3263 | struct device_attribute *attr, char *buf) | |
3264 | { | |
593a9e7b | 3265 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3266 | |
fc71d833 AE |
3267 | if (rbd_dev->major) |
3268 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3269 | ||
3270 | return sprintf(buf, "(none)\n"); | |
3271 | ||
dfc5606d YS |
3272 | } |
3273 | ||
3274 | static ssize_t rbd_client_id_show(struct device *dev, | |
3275 | struct device_attribute *attr, char *buf) | |
602adf40 | 3276 | { |
593a9e7b | 3277 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3278 | |
1dbb4399 AE |
3279 | return sprintf(buf, "client%lld\n", |
3280 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3281 | } |
3282 | ||
dfc5606d YS |
3283 | static ssize_t rbd_pool_show(struct device *dev, |
3284 | struct device_attribute *attr, char *buf) | |
602adf40 | 3285 | { |
593a9e7b | 3286 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3287 | |
0d7dbfce | 3288 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3289 | } |
3290 | ||
9bb2f334 AE |
3291 | static ssize_t rbd_pool_id_show(struct device *dev, |
3292 | struct device_attribute *attr, char *buf) | |
3293 | { | |
3294 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3295 | ||
0d7dbfce | 3296 | return sprintf(buf, "%llu\n", |
fc71d833 | 3297 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3298 | } |
3299 | ||
dfc5606d YS |
3300 | static ssize_t rbd_name_show(struct device *dev, |
3301 | struct device_attribute *attr, char *buf) | |
3302 | { | |
593a9e7b | 3303 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3304 | |
a92ffdf8 AE |
3305 | if (rbd_dev->spec->image_name) |
3306 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3307 | ||
3308 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3309 | } |
3310 | ||
589d30e0 AE |
3311 | static ssize_t rbd_image_id_show(struct device *dev, |
3312 | struct device_attribute *attr, char *buf) | |
3313 | { | |
3314 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3315 | ||
0d7dbfce | 3316 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3317 | } |
3318 | ||
34b13184 AE |
3319 | /* |
3320 | * Shows the name of the currently-mapped snapshot (or | |
3321 | * RBD_SNAP_HEAD_NAME for the base image). | |
3322 | */ | |
dfc5606d YS |
3323 | static ssize_t rbd_snap_show(struct device *dev, |
3324 | struct device_attribute *attr, | |
3325 | char *buf) | |
3326 | { | |
593a9e7b | 3327 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3328 | |
0d7dbfce | 3329 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3330 | } |
3331 | ||
86b00e0d AE |
3332 | /* |
3333 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3334 | * for the parent image. If there is no parent, simply shows | |
3335 | * "(no parent image)". | |
3336 | */ | |
3337 | static ssize_t rbd_parent_show(struct device *dev, | |
3338 | struct device_attribute *attr, | |
3339 | char *buf) | |
3340 | { | |
3341 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3342 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3343 | int count; | |
3344 | char *bufp = buf; | |
3345 | ||
3346 | if (!spec) | |
3347 | return sprintf(buf, "(no parent image)\n"); | |
3348 | ||
3349 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3350 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3351 | if (count < 0) | |
3352 | return count; | |
3353 | bufp += count; | |
3354 | ||
3355 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3356 | spec->image_name ? spec->image_name : "(unknown)"); | |
3357 | if (count < 0) | |
3358 | return count; | |
3359 | bufp += count; | |
3360 | ||
3361 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3362 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3363 | if (count < 0) | |
3364 | return count; | |
3365 | bufp += count; | |
3366 | ||
3367 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3368 | if (count < 0) | |
3369 | return count; | |
3370 | bufp += count; | |
3371 | ||
3372 | return (ssize_t) (bufp - buf); | |
3373 | } | |
3374 | ||
dfc5606d YS |
3375 | static ssize_t rbd_image_refresh(struct device *dev, |
3376 | struct device_attribute *attr, | |
3377 | const char *buf, | |
3378 | size_t size) | |
3379 | { | |
593a9e7b | 3380 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3381 | int ret; |
602adf40 | 3382 | |
cc4a38bd | 3383 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 AE |
3384 | if (ret) |
3385 | rbd_warn(rbd_dev, ": manual header refresh error (%d)\n", ret); | |
b813623a AE |
3386 | |
3387 | return ret < 0 ? ret : size; | |
dfc5606d | 3388 | } |
602adf40 | 3389 | |
dfc5606d | 3390 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3391 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d YS |
3392 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
3393 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
3394 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3395 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3396 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3397 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3398 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3399 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3400 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3401 | |
3402 | static struct attribute *rbd_attrs[] = { | |
3403 | &dev_attr_size.attr, | |
34b13184 | 3404 | &dev_attr_features.attr, |
dfc5606d YS |
3405 | &dev_attr_major.attr, |
3406 | &dev_attr_client_id.attr, | |
3407 | &dev_attr_pool.attr, | |
9bb2f334 | 3408 | &dev_attr_pool_id.attr, |
dfc5606d | 3409 | &dev_attr_name.attr, |
589d30e0 | 3410 | &dev_attr_image_id.attr, |
dfc5606d | 3411 | &dev_attr_current_snap.attr, |
86b00e0d | 3412 | &dev_attr_parent.attr, |
dfc5606d | 3413 | &dev_attr_refresh.attr, |
dfc5606d YS |
3414 | NULL |
3415 | }; | |
3416 | ||
3417 | static struct attribute_group rbd_attr_group = { | |
3418 | .attrs = rbd_attrs, | |
3419 | }; | |
3420 | ||
3421 | static const struct attribute_group *rbd_attr_groups[] = { | |
3422 | &rbd_attr_group, | |
3423 | NULL | |
3424 | }; | |
3425 | ||
3426 | static void rbd_sysfs_dev_release(struct device *dev) | |
3427 | { | |
3428 | } | |
3429 | ||
3430 | static struct device_type rbd_device_type = { | |
3431 | .name = "rbd", | |
3432 | .groups = rbd_attr_groups, | |
3433 | .release = rbd_sysfs_dev_release, | |
3434 | }; | |
3435 | ||
8b8fb99c AE |
3436 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3437 | { | |
3438 | kref_get(&spec->kref); | |
3439 | ||
3440 | return spec; | |
3441 | } | |
3442 | ||
3443 | static void rbd_spec_free(struct kref *kref); | |
3444 | static void rbd_spec_put(struct rbd_spec *spec) | |
3445 | { | |
3446 | if (spec) | |
3447 | kref_put(&spec->kref, rbd_spec_free); | |
3448 | } | |
3449 | ||
3450 | static struct rbd_spec *rbd_spec_alloc(void) | |
3451 | { | |
3452 | struct rbd_spec *spec; | |
3453 | ||
3454 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3455 | if (!spec) | |
3456 | return NULL; | |
3457 | kref_init(&spec->kref); | |
3458 | ||
8b8fb99c AE |
3459 | return spec; |
3460 | } | |
3461 | ||
3462 | static void rbd_spec_free(struct kref *kref) | |
3463 | { | |
3464 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3465 | ||
3466 | kfree(spec->pool_name); | |
3467 | kfree(spec->image_id); | |
3468 | kfree(spec->image_name); | |
3469 | kfree(spec->snap_name); | |
3470 | kfree(spec); | |
3471 | } | |
3472 | ||
cc344fa1 | 3473 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3474 | struct rbd_spec *spec) |
3475 | { | |
3476 | struct rbd_device *rbd_dev; | |
3477 | ||
3478 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3479 | if (!rbd_dev) | |
3480 | return NULL; | |
3481 | ||
3482 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3483 | rbd_dev->flags = 0; |
c53d5893 | 3484 | INIT_LIST_HEAD(&rbd_dev->node); |
c53d5893 AE |
3485 | init_rwsem(&rbd_dev->header_rwsem); |
3486 | ||
3487 | rbd_dev->spec = spec; | |
3488 | rbd_dev->rbd_client = rbdc; | |
3489 | ||
0903e875 AE |
3490 | /* Initialize the layout used for all rbd requests */ |
3491 | ||
3492 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3493 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3494 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3495 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3496 | ||
c53d5893 AE |
3497 | return rbd_dev; |
3498 | } | |
3499 | ||
3500 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3501 | { | |
c53d5893 AE |
3502 | rbd_put_client(rbd_dev->rbd_client); |
3503 | rbd_spec_put(rbd_dev->spec); | |
3504 | kfree(rbd_dev); | |
3505 | } | |
3506 | ||
9d475de5 AE |
3507 | /* |
3508 | * Get the size and object order for an image snapshot, or if | |
3509 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3510 | * image. | |
3511 | */ | |
3512 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3513 | u8 *order, u64 *snap_size) | |
3514 | { | |
3515 | __le64 snapid = cpu_to_le64(snap_id); | |
3516 | int ret; | |
3517 | struct { | |
3518 | u8 order; | |
3519 | __le64 size; | |
3520 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3521 | ||
36be9a76 | 3522 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3523 | "rbd", "get_size", |
4157976b | 3524 | &snapid, sizeof (snapid), |
e2a58ee5 | 3525 | &size_buf, sizeof (size_buf)); |
36be9a76 | 3526 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3527 | if (ret < 0) |
3528 | return ret; | |
57385b51 AE |
3529 | if (ret < sizeof (size_buf)) |
3530 | return -ERANGE; | |
9d475de5 | 3531 | |
c86f86e9 AE |
3532 | if (order) |
3533 | *order = size_buf.order; | |
9d475de5 AE |
3534 | *snap_size = le64_to_cpu(size_buf.size); |
3535 | ||
3536 | dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", | |
57385b51 AE |
3537 | (unsigned long long)snap_id, (unsigned int)*order, |
3538 | (unsigned long long)*snap_size); | |
9d475de5 AE |
3539 | |
3540 | return 0; | |
3541 | } | |
3542 | ||
3543 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3544 | { | |
3545 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3546 | &rbd_dev->header.obj_order, | |
3547 | &rbd_dev->header.image_size); | |
3548 | } | |
3549 | ||
1e130199 AE |
3550 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3551 | { | |
3552 | void *reply_buf; | |
3553 | int ret; | |
3554 | void *p; | |
3555 | ||
3556 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3557 | if (!reply_buf) | |
3558 | return -ENOMEM; | |
3559 | ||
36be9a76 | 3560 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3561 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 3562 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 3563 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3564 | if (ret < 0) |
3565 | goto out; | |
3566 | ||
3567 | p = reply_buf; | |
3568 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3569 | p + ret, NULL, GFP_NOIO); |
3570 | ret = 0; | |
1e130199 AE |
3571 | |
3572 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3573 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3574 | rbd_dev->header.object_prefix = NULL; | |
3575 | } else { | |
3576 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3577 | } | |
1e130199 AE |
3578 | out: |
3579 | kfree(reply_buf); | |
3580 | ||
3581 | return ret; | |
3582 | } | |
3583 | ||
b1b5402a AE |
3584 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3585 | u64 *snap_features) | |
3586 | { | |
3587 | __le64 snapid = cpu_to_le64(snap_id); | |
3588 | struct { | |
3589 | __le64 features; | |
3590 | __le64 incompat; | |
4157976b | 3591 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3592 | u64 incompat; |
b1b5402a AE |
3593 | int ret; |
3594 | ||
36be9a76 | 3595 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3596 | "rbd", "get_features", |
4157976b | 3597 | &snapid, sizeof (snapid), |
e2a58ee5 | 3598 | &features_buf, sizeof (features_buf)); |
36be9a76 | 3599 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3600 | if (ret < 0) |
3601 | return ret; | |
57385b51 AE |
3602 | if (ret < sizeof (features_buf)) |
3603 | return -ERANGE; | |
d889140c AE |
3604 | |
3605 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3606 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3607 | return -ENXIO; |
d889140c | 3608 | |
b1b5402a AE |
3609 | *snap_features = le64_to_cpu(features_buf.features); |
3610 | ||
3611 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
3612 | (unsigned long long)snap_id, |
3613 | (unsigned long long)*snap_features, | |
3614 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
3615 | |
3616 | return 0; | |
3617 | } | |
3618 | ||
3619 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
3620 | { | |
3621 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
3622 | &rbd_dev->header.features); | |
3623 | } | |
3624 | ||
86b00e0d AE |
3625 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
3626 | { | |
3627 | struct rbd_spec *parent_spec; | |
3628 | size_t size; | |
3629 | void *reply_buf = NULL; | |
3630 | __le64 snapid; | |
3631 | void *p; | |
3632 | void *end; | |
3633 | char *image_id; | |
3634 | u64 overlap; | |
86b00e0d AE |
3635 | int ret; |
3636 | ||
3637 | parent_spec = rbd_spec_alloc(); | |
3638 | if (!parent_spec) | |
3639 | return -ENOMEM; | |
3640 | ||
3641 | size = sizeof (__le64) + /* pool_id */ | |
3642 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
3643 | sizeof (__le64) + /* snap_id */ | |
3644 | sizeof (__le64); /* overlap */ | |
3645 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3646 | if (!reply_buf) { | |
3647 | ret = -ENOMEM; | |
3648 | goto out_err; | |
3649 | } | |
3650 | ||
3651 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 3652 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 3653 | "rbd", "get_parent", |
4157976b | 3654 | &snapid, sizeof (snapid), |
e2a58ee5 | 3655 | reply_buf, size); |
36be9a76 | 3656 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
3657 | if (ret < 0) |
3658 | goto out_err; | |
3659 | ||
86b00e0d | 3660 | p = reply_buf; |
57385b51 AE |
3661 | end = reply_buf + ret; |
3662 | ret = -ERANGE; | |
86b00e0d AE |
3663 | ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
3664 | if (parent_spec->pool_id == CEPH_NOPOOL) | |
3665 | goto out; /* No parent? No problem. */ | |
3666 | ||
0903e875 AE |
3667 | /* The ceph file layout needs to fit pool id in 32 bits */ |
3668 | ||
3669 | ret = -EIO; | |
c0cd10db AE |
3670 | if (parent_spec->pool_id > (u64)U32_MAX) { |
3671 | rbd_warn(NULL, "parent pool id too large (%llu > %u)\n", | |
3672 | (unsigned long long)parent_spec->pool_id, U32_MAX); | |
57385b51 | 3673 | goto out_err; |
c0cd10db | 3674 | } |
0903e875 | 3675 | |
979ed480 | 3676 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
3677 | if (IS_ERR(image_id)) { |
3678 | ret = PTR_ERR(image_id); | |
3679 | goto out_err; | |
3680 | } | |
3681 | parent_spec->image_id = image_id; | |
3682 | ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); | |
3683 | ceph_decode_64_safe(&p, end, overlap, out_err); | |
3684 | ||
3685 | rbd_dev->parent_overlap = overlap; | |
3686 | rbd_dev->parent_spec = parent_spec; | |
3687 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3688 | out: | |
3689 | ret = 0; | |
3690 | out_err: | |
3691 | kfree(reply_buf); | |
3692 | rbd_spec_put(parent_spec); | |
3693 | ||
3694 | return ret; | |
3695 | } | |
3696 | ||
cc070d59 AE |
3697 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
3698 | { | |
3699 | struct { | |
3700 | __le64 stripe_unit; | |
3701 | __le64 stripe_count; | |
3702 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
3703 | size_t size = sizeof (striping_info_buf); | |
3704 | void *p; | |
3705 | u64 obj_size; | |
3706 | u64 stripe_unit; | |
3707 | u64 stripe_count; | |
3708 | int ret; | |
3709 | ||
3710 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
3711 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 3712 | (char *)&striping_info_buf, size); |
cc070d59 AE |
3713 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
3714 | if (ret < 0) | |
3715 | return ret; | |
3716 | if (ret < size) | |
3717 | return -ERANGE; | |
3718 | ||
3719 | /* | |
3720 | * We don't actually support the "fancy striping" feature | |
3721 | * (STRIPINGV2) yet, but if the striping sizes are the | |
3722 | * defaults the behavior is the same as before. So find | |
3723 | * out, and only fail if the image has non-default values. | |
3724 | */ | |
3725 | ret = -EINVAL; | |
3726 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
3727 | p = &striping_info_buf; | |
3728 | stripe_unit = ceph_decode_64(&p); | |
3729 | if (stripe_unit != obj_size) { | |
3730 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
3731 | "(got %llu want %llu)", | |
3732 | stripe_unit, obj_size); | |
3733 | return -EINVAL; | |
3734 | } | |
3735 | stripe_count = ceph_decode_64(&p); | |
3736 | if (stripe_count != 1) { | |
3737 | rbd_warn(rbd_dev, "unsupported stripe count " | |
3738 | "(got %llu want 1)", stripe_count); | |
3739 | return -EINVAL; | |
3740 | } | |
500d0c0f AE |
3741 | rbd_dev->header.stripe_unit = stripe_unit; |
3742 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
3743 | |
3744 | return 0; | |
3745 | } | |
3746 | ||
9e15b77d AE |
3747 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
3748 | { | |
3749 | size_t image_id_size; | |
3750 | char *image_id; | |
3751 | void *p; | |
3752 | void *end; | |
3753 | size_t size; | |
3754 | void *reply_buf = NULL; | |
3755 | size_t len = 0; | |
3756 | char *image_name = NULL; | |
3757 | int ret; | |
3758 | ||
3759 | rbd_assert(!rbd_dev->spec->image_name); | |
3760 | ||
69e7a02f AE |
3761 | len = strlen(rbd_dev->spec->image_id); |
3762 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
3763 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
3764 | if (!image_id) | |
3765 | return NULL; | |
3766 | ||
3767 | p = image_id; | |
4157976b | 3768 | end = image_id + image_id_size; |
57385b51 | 3769 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
3770 | |
3771 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
3772 | reply_buf = kmalloc(size, GFP_KERNEL); | |
3773 | if (!reply_buf) | |
3774 | goto out; | |
3775 | ||
36be9a76 | 3776 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
3777 | "rbd", "dir_get_name", |
3778 | image_id, image_id_size, | |
e2a58ee5 | 3779 | reply_buf, size); |
9e15b77d AE |
3780 | if (ret < 0) |
3781 | goto out; | |
3782 | p = reply_buf; | |
f40eb349 AE |
3783 | end = reply_buf + ret; |
3784 | ||
9e15b77d AE |
3785 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
3786 | if (IS_ERR(image_name)) | |
3787 | image_name = NULL; | |
3788 | else | |
3789 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
3790 | out: | |
3791 | kfree(reply_buf); | |
3792 | kfree(image_id); | |
3793 | ||
3794 | return image_name; | |
3795 | } | |
3796 | ||
2ad3d716 AE |
3797 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
3798 | { | |
3799 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
3800 | const char *snap_name; | |
3801 | u32 which = 0; | |
3802 | ||
3803 | /* Skip over names until we find the one we are looking for */ | |
3804 | ||
3805 | snap_name = rbd_dev->header.snap_names; | |
3806 | while (which < snapc->num_snaps) { | |
3807 | if (!strcmp(name, snap_name)) | |
3808 | return snapc->snaps[which]; | |
3809 | snap_name += strlen(snap_name) + 1; | |
3810 | which++; | |
3811 | } | |
3812 | return CEPH_NOSNAP; | |
3813 | } | |
3814 | ||
3815 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
3816 | { | |
3817 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
3818 | u32 which; | |
3819 | bool found = false; | |
3820 | u64 snap_id; | |
3821 | ||
3822 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
3823 | const char *snap_name; | |
3824 | ||
3825 | snap_id = snapc->snaps[which]; | |
3826 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
3827 | if (IS_ERR(snap_name)) | |
3828 | break; | |
3829 | found = !strcmp(name, snap_name); | |
3830 | kfree(snap_name); | |
3831 | } | |
3832 | return found ? snap_id : CEPH_NOSNAP; | |
3833 | } | |
3834 | ||
3835 | /* | |
3836 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
3837 | * no snapshot by that name is found, or if an error occurs. | |
3838 | */ | |
3839 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
3840 | { | |
3841 | if (rbd_dev->image_format == 1) | |
3842 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
3843 | ||
3844 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
3845 | } | |
3846 | ||
9e15b77d | 3847 | /* |
2e9f7f1c AE |
3848 | * When an rbd image has a parent image, it is identified by the |
3849 | * pool, image, and snapshot ids (not names). This function fills | |
3850 | * in the names for those ids. (It's OK if we can't figure out the | |
3851 | * name for an image id, but the pool and snapshot ids should always | |
3852 | * exist and have names.) All names in an rbd spec are dynamically | |
3853 | * allocated. | |
e1d4213f AE |
3854 | * |
3855 | * When an image being mapped (not a parent) is probed, we have the | |
3856 | * pool name and pool id, image name and image id, and the snapshot | |
3857 | * name. The only thing we're missing is the snapshot id. | |
9e15b77d | 3858 | */ |
2e9f7f1c | 3859 | static int rbd_dev_spec_update(struct rbd_device *rbd_dev) |
9e15b77d | 3860 | { |
2e9f7f1c AE |
3861 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3862 | struct rbd_spec *spec = rbd_dev->spec; | |
3863 | const char *pool_name; | |
3864 | const char *image_name; | |
3865 | const char *snap_name; | |
9e15b77d AE |
3866 | int ret; |
3867 | ||
e1d4213f AE |
3868 | /* |
3869 | * An image being mapped will have the pool name (etc.), but | |
3870 | * we need to look up the snapshot id. | |
3871 | */ | |
2e9f7f1c AE |
3872 | if (spec->pool_name) { |
3873 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
2ad3d716 | 3874 | u64 snap_id; |
e1d4213f | 3875 | |
2ad3d716 AE |
3876 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
3877 | if (snap_id == CEPH_NOSNAP) | |
e1d4213f | 3878 | return -ENOENT; |
2ad3d716 | 3879 | spec->snap_id = snap_id; |
e1d4213f | 3880 | } else { |
2e9f7f1c | 3881 | spec->snap_id = CEPH_NOSNAP; |
e1d4213f AE |
3882 | } |
3883 | ||
3884 | return 0; | |
3885 | } | |
9e15b77d | 3886 | |
2e9f7f1c | 3887 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 3888 | |
2e9f7f1c AE |
3889 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
3890 | if (!pool_name) { | |
3891 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
3892 | return -EIO; |
3893 | } | |
2e9f7f1c AE |
3894 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
3895 | if (!pool_name) | |
9e15b77d AE |
3896 | return -ENOMEM; |
3897 | ||
3898 | /* Fetch the image name; tolerate failure here */ | |
3899 | ||
2e9f7f1c AE |
3900 | image_name = rbd_dev_image_name(rbd_dev); |
3901 | if (!image_name) | |
06ecc6cb | 3902 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 3903 | |
2e9f7f1c | 3904 | /* Look up the snapshot name, and make a copy */ |
9e15b77d | 3905 | |
2e9f7f1c | 3906 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
2e9f7f1c AE |
3907 | if (!snap_name) { |
3908 | ret = -ENOMEM; | |
9e15b77d | 3909 | goto out_err; |
2e9f7f1c AE |
3910 | } |
3911 | ||
3912 | spec->pool_name = pool_name; | |
3913 | spec->image_name = image_name; | |
3914 | spec->snap_name = snap_name; | |
9e15b77d AE |
3915 | |
3916 | return 0; | |
3917 | out_err: | |
2e9f7f1c AE |
3918 | kfree(image_name); |
3919 | kfree(pool_name); | |
9e15b77d AE |
3920 | |
3921 | return ret; | |
3922 | } | |
3923 | ||
cc4a38bd | 3924 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
3925 | { |
3926 | size_t size; | |
3927 | int ret; | |
3928 | void *reply_buf; | |
3929 | void *p; | |
3930 | void *end; | |
3931 | u64 seq; | |
3932 | u32 snap_count; | |
3933 | struct ceph_snap_context *snapc; | |
3934 | u32 i; | |
3935 | ||
3936 | /* | |
3937 | * We'll need room for the seq value (maximum snapshot id), | |
3938 | * snapshot count, and array of that many snapshot ids. | |
3939 | * For now we have a fixed upper limit on the number we're | |
3940 | * prepared to receive. | |
3941 | */ | |
3942 | size = sizeof (__le64) + sizeof (__le32) + | |
3943 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
3944 | reply_buf = kzalloc(size, GFP_KERNEL); | |
3945 | if (!reply_buf) | |
3946 | return -ENOMEM; | |
3947 | ||
36be9a76 | 3948 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3949 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 3950 | reply_buf, size); |
36be9a76 | 3951 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
3952 | if (ret < 0) |
3953 | goto out; | |
3954 | ||
35d489f9 | 3955 | p = reply_buf; |
57385b51 AE |
3956 | end = reply_buf + ret; |
3957 | ret = -ERANGE; | |
35d489f9 AE |
3958 | ceph_decode_64_safe(&p, end, seq, out); |
3959 | ceph_decode_32_safe(&p, end, snap_count, out); | |
3960 | ||
3961 | /* | |
3962 | * Make sure the reported number of snapshot ids wouldn't go | |
3963 | * beyond the end of our buffer. But before checking that, | |
3964 | * make sure the computed size of the snapshot context we | |
3965 | * allocate is representable in a size_t. | |
3966 | */ | |
3967 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
3968 | / sizeof (u64)) { | |
3969 | ret = -EINVAL; | |
3970 | goto out; | |
3971 | } | |
3972 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
3973 | goto out; | |
468521c1 | 3974 | ret = 0; |
35d489f9 | 3975 | |
812164f8 | 3976 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
3977 | if (!snapc) { |
3978 | ret = -ENOMEM; | |
3979 | goto out; | |
3980 | } | |
35d489f9 | 3981 | snapc->seq = seq; |
35d489f9 AE |
3982 | for (i = 0; i < snap_count; i++) |
3983 | snapc->snaps[i] = ceph_decode_64(&p); | |
3984 | ||
49ece554 | 3985 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
3986 | rbd_dev->header.snapc = snapc; |
3987 | ||
3988 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 3989 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
3990 | out: |
3991 | kfree(reply_buf); | |
3992 | ||
57385b51 | 3993 | return ret; |
35d489f9 AE |
3994 | } |
3995 | ||
54cac61f AE |
3996 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
3997 | u64 snap_id) | |
b8b1e2db AE |
3998 | { |
3999 | size_t size; | |
4000 | void *reply_buf; | |
54cac61f | 4001 | __le64 snapid; |
b8b1e2db AE |
4002 | int ret; |
4003 | void *p; | |
4004 | void *end; | |
b8b1e2db AE |
4005 | char *snap_name; |
4006 | ||
4007 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4008 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4009 | if (!reply_buf) | |
4010 | return ERR_PTR(-ENOMEM); | |
4011 | ||
54cac61f | 4012 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 4013 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 4014 | "rbd", "get_snapshot_name", |
54cac61f | 4015 | &snapid, sizeof (snapid), |
e2a58ee5 | 4016 | reply_buf, size); |
36be9a76 | 4017 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4018 | if (ret < 0) { |
4019 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4020 | goto out; |
f40eb349 | 4021 | } |
b8b1e2db AE |
4022 | |
4023 | p = reply_buf; | |
f40eb349 | 4024 | end = reply_buf + ret; |
e5c35534 | 4025 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4026 | if (IS_ERR(snap_name)) |
b8b1e2db | 4027 | goto out; |
b8b1e2db | 4028 | |
f40eb349 | 4029 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4030 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4031 | out: |
4032 | kfree(reply_buf); | |
4033 | ||
f40eb349 | 4034 | return snap_name; |
b8b1e2db AE |
4035 | } |
4036 | ||
cc4a38bd | 4037 | static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev) |
117973fb AE |
4038 | { |
4039 | int ret; | |
117973fb AE |
4040 | |
4041 | down_write(&rbd_dev->header_rwsem); | |
4042 | ||
117973fb AE |
4043 | ret = rbd_dev_v2_image_size(rbd_dev); |
4044 | if (ret) | |
4045 | goto out; | |
29334ba4 AE |
4046 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) |
4047 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) | |
4048 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
117973fb | 4049 | |
cc4a38bd | 4050 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb AE |
4051 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
4052 | if (ret) | |
4053 | goto out; | |
117973fb AE |
4054 | out: |
4055 | up_write(&rbd_dev->header_rwsem); | |
4056 | ||
4057 | return ret; | |
4058 | } | |
4059 | ||
dfc5606d YS |
4060 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4061 | { | |
dfc5606d | 4062 | struct device *dev; |
cd789ab9 | 4063 | int ret; |
dfc5606d YS |
4064 | |
4065 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
dfc5606d | 4066 | |
cd789ab9 | 4067 | dev = &rbd_dev->dev; |
dfc5606d YS |
4068 | dev->bus = &rbd_bus_type; |
4069 | dev->type = &rbd_device_type; | |
4070 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4071 | dev->release = rbd_dev_device_release; |
de71a297 | 4072 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4073 | ret = device_register(dev); |
dfc5606d | 4074 | |
dfc5606d | 4075 | mutex_unlock(&ctl_mutex); |
cd789ab9 | 4076 | |
dfc5606d | 4077 | return ret; |
602adf40 YS |
4078 | } |
4079 | ||
dfc5606d YS |
4080 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4081 | { | |
4082 | device_unregister(&rbd_dev->dev); | |
4083 | } | |
4084 | ||
e2839308 | 4085 | static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
1ddbe94e AE |
4086 | |
4087 | /* | |
499afd5b AE |
4088 | * Get a unique rbd identifier for the given new rbd_dev, and add |
4089 | * the rbd_dev to the global list. The minimum rbd id is 1. | |
1ddbe94e | 4090 | */ |
e2839308 | 4091 | static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4092 | { |
e2839308 | 4093 | rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
499afd5b AE |
4094 | |
4095 | spin_lock(&rbd_dev_list_lock); | |
4096 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4097 | spin_unlock(&rbd_dev_list_lock); | |
e2839308 AE |
4098 | dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
4099 | (unsigned long long) rbd_dev->dev_id); | |
1ddbe94e | 4100 | } |
b7f23c36 | 4101 | |
1ddbe94e | 4102 | /* |
499afd5b AE |
4103 | * Remove an rbd_dev from the global list, and record that its |
4104 | * identifier is no longer in use. | |
1ddbe94e | 4105 | */ |
e2839308 | 4106 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4107 | { |
d184f6bf | 4108 | struct list_head *tmp; |
de71a297 | 4109 | int rbd_id = rbd_dev->dev_id; |
d184f6bf AE |
4110 | int max_id; |
4111 | ||
aafb230e | 4112 | rbd_assert(rbd_id > 0); |
499afd5b | 4113 | |
e2839308 AE |
4114 | dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
4115 | (unsigned long long) rbd_dev->dev_id); | |
499afd5b AE |
4116 | spin_lock(&rbd_dev_list_lock); |
4117 | list_del_init(&rbd_dev->node); | |
d184f6bf AE |
4118 | |
4119 | /* | |
4120 | * If the id being "put" is not the current maximum, there | |
4121 | * is nothing special we need to do. | |
4122 | */ | |
e2839308 | 4123 | if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
d184f6bf AE |
4124 | spin_unlock(&rbd_dev_list_lock); |
4125 | return; | |
4126 | } | |
4127 | ||
4128 | /* | |
4129 | * We need to update the current maximum id. Search the | |
4130 | * list to find out what it is. We're more likely to find | |
4131 | * the maximum at the end, so search the list backward. | |
4132 | */ | |
4133 | max_id = 0; | |
4134 | list_for_each_prev(tmp, &rbd_dev_list) { | |
4135 | struct rbd_device *rbd_dev; | |
4136 | ||
4137 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
b213e0b1 AE |
4138 | if (rbd_dev->dev_id > max_id) |
4139 | max_id = rbd_dev->dev_id; | |
d184f6bf | 4140 | } |
499afd5b | 4141 | spin_unlock(&rbd_dev_list_lock); |
b7f23c36 | 4142 | |
1ddbe94e | 4143 | /* |
e2839308 | 4144 | * The max id could have been updated by rbd_dev_id_get(), in |
d184f6bf AE |
4145 | * which case it now accurately reflects the new maximum. |
4146 | * Be careful not to overwrite the maximum value in that | |
4147 | * case. | |
1ddbe94e | 4148 | */ |
e2839308 AE |
4149 | atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
4150 | dout(" max dev id has been reset\n"); | |
b7f23c36 AE |
4151 | } |
4152 | ||
e28fff26 AE |
4153 | /* |
4154 | * Skips over white space at *buf, and updates *buf to point to the | |
4155 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4156 | * the token (string of non-white space characters) found. Note |
4157 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4158 | */ |
4159 | static inline size_t next_token(const char **buf) | |
4160 | { | |
4161 | /* | |
4162 | * These are the characters that produce nonzero for | |
4163 | * isspace() in the "C" and "POSIX" locales. | |
4164 | */ | |
4165 | const char *spaces = " \f\n\r\t\v"; | |
4166 | ||
4167 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4168 | ||
4169 | return strcspn(*buf, spaces); /* Return token length */ | |
4170 | } | |
4171 | ||
4172 | /* | |
4173 | * Finds the next token in *buf, and if the provided token buffer is | |
4174 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4175 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4176 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4177 | * |
4178 | * Returns the length of the token found (not including the '\0'). | |
4179 | * Return value will be 0 if no token is found, and it will be >= | |
4180 | * token_size if the token would not fit. | |
4181 | * | |
593a9e7b | 4182 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4183 | * found token. Note that this occurs even if the token buffer is |
4184 | * too small to hold it. | |
4185 | */ | |
4186 | static inline size_t copy_token(const char **buf, | |
4187 | char *token, | |
4188 | size_t token_size) | |
4189 | { | |
4190 | size_t len; | |
4191 | ||
4192 | len = next_token(buf); | |
4193 | if (len < token_size) { | |
4194 | memcpy(token, *buf, len); | |
4195 | *(token + len) = '\0'; | |
4196 | } | |
4197 | *buf += len; | |
4198 | ||
4199 | return len; | |
4200 | } | |
4201 | ||
ea3352f4 AE |
4202 | /* |
4203 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4204 | * enough to hold a copy of it, and copies the token into the new | |
4205 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4206 | * that a duplicate buffer is created even for a zero-length token. | |
4207 | * | |
4208 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4209 | * pointer if memory for the duplicate was not available. If | |
4210 | * the lenp argument is a non-null pointer, the length of the token | |
4211 | * (not including the '\0') is returned in *lenp. | |
4212 | * | |
4213 | * If successful, the *buf pointer will be updated to point beyond | |
4214 | * the end of the found token. | |
4215 | * | |
4216 | * Note: uses GFP_KERNEL for allocation. | |
4217 | */ | |
4218 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4219 | { | |
4220 | char *dup; | |
4221 | size_t len; | |
4222 | ||
4223 | len = next_token(buf); | |
4caf35f9 | 4224 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4225 | if (!dup) |
4226 | return NULL; | |
ea3352f4 AE |
4227 | *(dup + len) = '\0'; |
4228 | *buf += len; | |
4229 | ||
4230 | if (lenp) | |
4231 | *lenp = len; | |
4232 | ||
4233 | return dup; | |
4234 | } | |
4235 | ||
a725f65e | 4236 | /* |
859c31df AE |
4237 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4238 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4239 | * and the data written is passed here via a NUL-terminated buffer. | |
4240 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4241 | * |
859c31df AE |
4242 | * The information extracted from these options is recorded in |
4243 | * the other parameters which return dynamically-allocated | |
4244 | * structures: | |
4245 | * ceph_opts | |
4246 | * The address of a pointer that will refer to a ceph options | |
4247 | * structure. Caller must release the returned pointer using | |
4248 | * ceph_destroy_options() when it is no longer needed. | |
4249 | * rbd_opts | |
4250 | * Address of an rbd options pointer. Fully initialized by | |
4251 | * this function; caller must release with kfree(). | |
4252 | * spec | |
4253 | * Address of an rbd image specification pointer. Fully | |
4254 | * initialized by this function based on parsed options. | |
4255 | * Caller must release with rbd_spec_put(). | |
4256 | * | |
4257 | * The options passed take this form: | |
4258 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4259 | * where: | |
4260 | * <mon_addrs> | |
4261 | * A comma-separated list of one or more monitor addresses. | |
4262 | * A monitor address is an ip address, optionally followed | |
4263 | * by a port number (separated by a colon). | |
4264 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4265 | * <options> | |
4266 | * A comma-separated list of ceph and/or rbd options. | |
4267 | * <pool_name> | |
4268 | * The name of the rados pool containing the rbd image. | |
4269 | * <image_name> | |
4270 | * The name of the image in that pool to map. | |
4271 | * <snap_id> | |
4272 | * An optional snapshot id. If provided, the mapping will | |
4273 | * present data from the image at the time that snapshot was | |
4274 | * created. The image head is used if no snapshot id is | |
4275 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4276 | */ |
859c31df | 4277 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4278 | struct ceph_options **ceph_opts, |
859c31df AE |
4279 | struct rbd_options **opts, |
4280 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4281 | { |
d22f76e7 | 4282 | size_t len; |
859c31df | 4283 | char *options; |
0ddebc0c | 4284 | const char *mon_addrs; |
ecb4dc22 | 4285 | char *snap_name; |
0ddebc0c | 4286 | size_t mon_addrs_size; |
859c31df | 4287 | struct rbd_spec *spec = NULL; |
4e9afeba | 4288 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4289 | struct ceph_options *copts; |
dc79b113 | 4290 | int ret; |
e28fff26 AE |
4291 | |
4292 | /* The first four tokens are required */ | |
4293 | ||
7ef3214a | 4294 | len = next_token(&buf); |
4fb5d671 AE |
4295 | if (!len) { |
4296 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4297 | return -EINVAL; | |
4298 | } | |
0ddebc0c | 4299 | mon_addrs = buf; |
f28e565a | 4300 | mon_addrs_size = len + 1; |
7ef3214a | 4301 | buf += len; |
a725f65e | 4302 | |
dc79b113 | 4303 | ret = -EINVAL; |
f28e565a AE |
4304 | options = dup_token(&buf, NULL); |
4305 | if (!options) | |
dc79b113 | 4306 | return -ENOMEM; |
4fb5d671 AE |
4307 | if (!*options) { |
4308 | rbd_warn(NULL, "no options provided"); | |
4309 | goto out_err; | |
4310 | } | |
e28fff26 | 4311 | |
859c31df AE |
4312 | spec = rbd_spec_alloc(); |
4313 | if (!spec) | |
f28e565a | 4314 | goto out_mem; |
859c31df AE |
4315 | |
4316 | spec->pool_name = dup_token(&buf, NULL); | |
4317 | if (!spec->pool_name) | |
4318 | goto out_mem; | |
4fb5d671 AE |
4319 | if (!*spec->pool_name) { |
4320 | rbd_warn(NULL, "no pool name provided"); | |
4321 | goto out_err; | |
4322 | } | |
e28fff26 | 4323 | |
69e7a02f | 4324 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4325 | if (!spec->image_name) |
f28e565a | 4326 | goto out_mem; |
4fb5d671 AE |
4327 | if (!*spec->image_name) { |
4328 | rbd_warn(NULL, "no image name provided"); | |
4329 | goto out_err; | |
4330 | } | |
d4b125e9 | 4331 | |
f28e565a AE |
4332 | /* |
4333 | * Snapshot name is optional; default is to use "-" | |
4334 | * (indicating the head/no snapshot). | |
4335 | */ | |
3feeb894 | 4336 | len = next_token(&buf); |
820a5f3e | 4337 | if (!len) { |
3feeb894 AE |
4338 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4339 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4340 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4341 | ret = -ENAMETOOLONG; |
f28e565a | 4342 | goto out_err; |
849b4260 | 4343 | } |
ecb4dc22 AE |
4344 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4345 | if (!snap_name) | |
f28e565a | 4346 | goto out_mem; |
ecb4dc22 AE |
4347 | *(snap_name + len) = '\0'; |
4348 | spec->snap_name = snap_name; | |
e5c35534 | 4349 | |
0ddebc0c | 4350 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4351 | |
4e9afeba AE |
4352 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4353 | if (!rbd_opts) | |
4354 | goto out_mem; | |
4355 | ||
4356 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4357 | |
859c31df | 4358 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4359 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4360 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4361 | if (IS_ERR(copts)) { |
4362 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4363 | goto out_err; |
4364 | } | |
859c31df AE |
4365 | kfree(options); |
4366 | ||
4367 | *ceph_opts = copts; | |
4e9afeba | 4368 | *opts = rbd_opts; |
859c31df | 4369 | *rbd_spec = spec; |
0ddebc0c | 4370 | |
dc79b113 | 4371 | return 0; |
f28e565a | 4372 | out_mem: |
dc79b113 | 4373 | ret = -ENOMEM; |
d22f76e7 | 4374 | out_err: |
859c31df AE |
4375 | kfree(rbd_opts); |
4376 | rbd_spec_put(spec); | |
f28e565a | 4377 | kfree(options); |
d22f76e7 | 4378 | |
dc79b113 | 4379 | return ret; |
a725f65e AE |
4380 | } |
4381 | ||
589d30e0 AE |
4382 | /* |
4383 | * An rbd format 2 image has a unique identifier, distinct from the | |
4384 | * name given to it by the user. Internally, that identifier is | |
4385 | * what's used to specify the names of objects related to the image. | |
4386 | * | |
4387 | * A special "rbd id" object is used to map an rbd image name to its | |
4388 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4389 | * with the supplied name. | |
4390 | * | |
4391 | * This function will record the given rbd_dev's image_id field if | |
4392 | * it can be determined, and in that case will return 0. If any | |
4393 | * errors occur a negative errno will be returned and the rbd_dev's | |
4394 | * image_id field will be unchanged (and should be NULL). | |
4395 | */ | |
4396 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4397 | { | |
4398 | int ret; | |
4399 | size_t size; | |
4400 | char *object_name; | |
4401 | void *response; | |
c0fba368 | 4402 | char *image_id; |
2f82ee54 | 4403 | |
2c0d0a10 AE |
4404 | /* |
4405 | * When probing a parent image, the image id is already | |
4406 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4407 | * need to fetch the image id again in this case. We |
4408 | * do still need to set the image format though. | |
2c0d0a10 | 4409 | */ |
c0fba368 AE |
4410 | if (rbd_dev->spec->image_id) { |
4411 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4412 | ||
2c0d0a10 | 4413 | return 0; |
c0fba368 | 4414 | } |
2c0d0a10 | 4415 | |
589d30e0 AE |
4416 | /* |
4417 | * First, see if the format 2 image id file exists, and if | |
4418 | * so, get the image's persistent id from it. | |
4419 | */ | |
69e7a02f | 4420 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4421 | object_name = kmalloc(size, GFP_NOIO); |
4422 | if (!object_name) | |
4423 | return -ENOMEM; | |
0d7dbfce | 4424 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4425 | dout("rbd id object name is %s\n", object_name); |
4426 | ||
4427 | /* Response will be an encoded string, which includes a length */ | |
4428 | ||
4429 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4430 | response = kzalloc(size, GFP_NOIO); | |
4431 | if (!response) { | |
4432 | ret = -ENOMEM; | |
4433 | goto out; | |
4434 | } | |
4435 | ||
c0fba368 AE |
4436 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4437 | ||
36be9a76 | 4438 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4439 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 4440 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 4441 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4442 | if (ret == -ENOENT) { |
4443 | image_id = kstrdup("", GFP_KERNEL); | |
4444 | ret = image_id ? 0 : -ENOMEM; | |
4445 | if (!ret) | |
4446 | rbd_dev->image_format = 1; | |
4447 | } else if (ret > sizeof (__le32)) { | |
4448 | void *p = response; | |
4449 | ||
4450 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4451 | NULL, GFP_NOIO); |
c0fba368 AE |
4452 | ret = IS_ERR(image_id) ? PTR_ERR(image_id) : 0; |
4453 | if (!ret) | |
4454 | rbd_dev->image_format = 2; | |
589d30e0 | 4455 | } else { |
c0fba368 AE |
4456 | ret = -EINVAL; |
4457 | } | |
4458 | ||
4459 | if (!ret) { | |
4460 | rbd_dev->spec->image_id = image_id; | |
4461 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4462 | } |
4463 | out: | |
4464 | kfree(response); | |
4465 | kfree(object_name); | |
4466 | ||
4467 | return ret; | |
4468 | } | |
4469 | ||
6fd48b3b AE |
4470 | /* Undo whatever state changes are made by v1 or v2 image probe */ |
4471 | ||
4472 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) | |
4473 | { | |
4474 | struct rbd_image_header *header; | |
4475 | ||
4476 | rbd_dev_remove_parent(rbd_dev); | |
4477 | rbd_spec_put(rbd_dev->parent_spec); | |
4478 | rbd_dev->parent_spec = NULL; | |
4479 | rbd_dev->parent_overlap = 0; | |
4480 | ||
4481 | /* Free dynamic fields from the header, then zero it out */ | |
4482 | ||
4483 | header = &rbd_dev->header; | |
812164f8 | 4484 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4485 | kfree(header->snap_sizes); |
4486 | kfree(header->snap_names); | |
4487 | kfree(header->object_prefix); | |
4488 | memset(header, 0, sizeof (*header)); | |
4489 | } | |
4490 | ||
a30b71b9 AE |
4491 | static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
4492 | { | |
4493 | int ret; | |
a30b71b9 AE |
4494 | |
4495 | /* Populate rbd image metadata */ | |
4496 | ||
4497 | ret = rbd_read_header(rbd_dev, &rbd_dev->header); | |
4498 | if (ret < 0) | |
4499 | goto out_err; | |
86b00e0d AE |
4500 | |
4501 | /* Version 1 images have no parent (no layering) */ | |
4502 | ||
4503 | rbd_dev->parent_spec = NULL; | |
4504 | rbd_dev->parent_overlap = 0; | |
4505 | ||
a30b71b9 AE |
4506 | dout("discovered version 1 image, header name is %s\n", |
4507 | rbd_dev->header_name); | |
4508 | ||
4509 | return 0; | |
4510 | ||
4511 | out_err: | |
4512 | kfree(rbd_dev->header_name); | |
4513 | rbd_dev->header_name = NULL; | |
0d7dbfce AE |
4514 | kfree(rbd_dev->spec->image_id); |
4515 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
4516 | |
4517 | return ret; | |
4518 | } | |
4519 | ||
4520 | static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) | |
4521 | { | |
9d475de5 | 4522 | int ret; |
a30b71b9 | 4523 | |
9d475de5 | 4524 | ret = rbd_dev_v2_image_size(rbd_dev); |
57385b51 | 4525 | if (ret) |
1e130199 AE |
4526 | goto out_err; |
4527 | ||
4528 | /* Get the object prefix (a.k.a. block_name) for the image */ | |
4529 | ||
4530 | ret = rbd_dev_v2_object_prefix(rbd_dev); | |
57385b51 | 4531 | if (ret) |
b1b5402a AE |
4532 | goto out_err; |
4533 | ||
d889140c | 4534 | /* Get the and check features for the image */ |
b1b5402a AE |
4535 | |
4536 | ret = rbd_dev_v2_features(rbd_dev); | |
57385b51 | 4537 | if (ret) |
9d475de5 | 4538 | goto out_err; |
35d489f9 | 4539 | |
86b00e0d AE |
4540 | /* If the image supports layering, get the parent info */ |
4541 | ||
4542 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { | |
4543 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
57385b51 | 4544 | if (ret) |
86b00e0d | 4545 | goto out_err; |
96882f55 | 4546 | /* |
c734b796 AE |
4547 | * Print a warning if this image has a parent. |
4548 | * Don't print it if the image now being probed | |
4549 | * is itself a parent. We can tell at this point | |
4550 | * because we won't know its pool name yet (just its | |
4551 | * pool id). | |
96882f55 | 4552 | */ |
c734b796 | 4553 | if (rbd_dev->parent_spec && rbd_dev->spec->pool_name) |
96882f55 AE |
4554 | rbd_warn(rbd_dev, "WARNING: kernel layering " |
4555 | "is EXPERIMENTAL!"); | |
86b00e0d AE |
4556 | } |
4557 | ||
cc070d59 AE |
4558 | /* If the image supports fancy striping, get its parameters */ |
4559 | ||
4560 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4561 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4562 | if (ret < 0) | |
4563 | goto out_err; | |
4564 | } | |
4565 | ||
6e14b1a6 AE |
4566 | /* crypto and compression type aren't (yet) supported for v2 images */ |
4567 | ||
4568 | rbd_dev->header.crypt_type = 0; | |
4569 | rbd_dev->header.comp_type = 0; | |
35d489f9 | 4570 | |
6e14b1a6 AE |
4571 | /* Get the snapshot context, plus the header version */ |
4572 | ||
cc4a38bd | 4573 | ret = rbd_dev_v2_snap_context(rbd_dev); |
35d489f9 AE |
4574 | if (ret) |
4575 | goto out_err; | |
6e14b1a6 | 4576 | |
a30b71b9 AE |
4577 | dout("discovered version 2 image, header name is %s\n", |
4578 | rbd_dev->header_name); | |
4579 | ||
35152979 | 4580 | return 0; |
9d475de5 | 4581 | out_err: |
86b00e0d AE |
4582 | rbd_dev->parent_overlap = 0; |
4583 | rbd_spec_put(rbd_dev->parent_spec); | |
4584 | rbd_dev->parent_spec = NULL; | |
9d475de5 AE |
4585 | kfree(rbd_dev->header_name); |
4586 | rbd_dev->header_name = NULL; | |
1e130199 AE |
4587 | kfree(rbd_dev->header.object_prefix); |
4588 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
4589 | |
4590 | return ret; | |
a30b71b9 AE |
4591 | } |
4592 | ||
124afba2 | 4593 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 4594 | { |
2f82ee54 | 4595 | struct rbd_device *parent = NULL; |
124afba2 AE |
4596 | struct rbd_spec *parent_spec; |
4597 | struct rbd_client *rbdc; | |
4598 | int ret; | |
4599 | ||
4600 | if (!rbd_dev->parent_spec) | |
4601 | return 0; | |
4602 | /* | |
4603 | * We need to pass a reference to the client and the parent | |
4604 | * spec when creating the parent rbd_dev. Images related by | |
4605 | * parent/child relationships always share both. | |
4606 | */ | |
4607 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
4608 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
4609 | ||
4610 | ret = -ENOMEM; | |
4611 | parent = rbd_dev_create(rbdc, parent_spec); | |
4612 | if (!parent) | |
4613 | goto out_err; | |
4614 | ||
51344a38 | 4615 | ret = rbd_dev_image_probe(parent, true); |
124afba2 AE |
4616 | if (ret < 0) |
4617 | goto out_err; | |
4618 | rbd_dev->parent = parent; | |
4619 | ||
4620 | return 0; | |
4621 | out_err: | |
4622 | if (parent) { | |
4623 | rbd_spec_put(rbd_dev->parent_spec); | |
4624 | kfree(rbd_dev->header_name); | |
4625 | rbd_dev_destroy(parent); | |
4626 | } else { | |
4627 | rbd_put_client(rbdc); | |
4628 | rbd_spec_put(parent_spec); | |
4629 | } | |
4630 | ||
4631 | return ret; | |
4632 | } | |
4633 | ||
200a6a8b | 4634 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 4635 | { |
83a06263 | 4636 | int ret; |
d1cf5788 | 4637 | |
83a06263 AE |
4638 | /* generate unique id: find highest unique id, add one */ |
4639 | rbd_dev_id_get(rbd_dev); | |
4640 | ||
4641 | /* Fill in the device name, now that we have its id. */ | |
4642 | BUILD_BUG_ON(DEV_NAME_LEN | |
4643 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
4644 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
4645 | ||
4646 | /* Get our block major device number. */ | |
4647 | ||
4648 | ret = register_blkdev(0, rbd_dev->name); | |
4649 | if (ret < 0) | |
4650 | goto err_out_id; | |
4651 | rbd_dev->major = ret; | |
4652 | ||
4653 | /* Set up the blkdev mapping. */ | |
4654 | ||
4655 | ret = rbd_init_disk(rbd_dev); | |
4656 | if (ret) | |
4657 | goto err_out_blkdev; | |
4658 | ||
f35a4dee | 4659 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
4660 | if (ret) |
4661 | goto err_out_disk; | |
f35a4dee AE |
4662 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
4663 | ||
4664 | ret = rbd_bus_add_dev(rbd_dev); | |
4665 | if (ret) | |
4666 | goto err_out_mapping; | |
83a06263 | 4667 | |
83a06263 AE |
4668 | /* Everything's ready. Announce the disk to the world. */ |
4669 | ||
129b79d4 | 4670 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
4671 | add_disk(rbd_dev->disk); |
4672 | ||
4673 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
4674 | (unsigned long long) rbd_dev->mapping.size); | |
4675 | ||
4676 | return ret; | |
2f82ee54 | 4677 | |
f35a4dee AE |
4678 | err_out_mapping: |
4679 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
4680 | err_out_disk: |
4681 | rbd_free_disk(rbd_dev); | |
4682 | err_out_blkdev: | |
4683 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
4684 | err_out_id: | |
4685 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 4686 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
4687 | |
4688 | return ret; | |
4689 | } | |
4690 | ||
332bb12d AE |
4691 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
4692 | { | |
4693 | struct rbd_spec *spec = rbd_dev->spec; | |
4694 | size_t size; | |
4695 | ||
4696 | /* Record the header object name for this rbd image. */ | |
4697 | ||
4698 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4699 | ||
4700 | if (rbd_dev->image_format == 1) | |
4701 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
4702 | else | |
4703 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
4704 | ||
4705 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
4706 | if (!rbd_dev->header_name) | |
4707 | return -ENOMEM; | |
4708 | ||
4709 | if (rbd_dev->image_format == 1) | |
4710 | sprintf(rbd_dev->header_name, "%s%s", | |
4711 | spec->image_name, RBD_SUFFIX); | |
4712 | else | |
4713 | sprintf(rbd_dev->header_name, "%s%s", | |
4714 | RBD_HEADER_PREFIX, spec->image_id); | |
4715 | return 0; | |
4716 | } | |
4717 | ||
200a6a8b AE |
4718 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
4719 | { | |
6fd48b3b AE |
4720 | int ret; |
4721 | ||
6fd48b3b AE |
4722 | rbd_dev_unprobe(rbd_dev); |
4723 | ret = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4724 | if (ret) | |
4725 | rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret); | |
200a6a8b | 4726 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
4727 | rbd_dev->header_name = NULL; |
4728 | rbd_dev->image_format = 0; | |
4729 | kfree(rbd_dev->spec->image_id); | |
4730 | rbd_dev->spec->image_id = NULL; | |
4731 | ||
200a6a8b AE |
4732 | rbd_dev_destroy(rbd_dev); |
4733 | } | |
4734 | ||
a30b71b9 AE |
4735 | /* |
4736 | * Probe for the existence of the header object for the given rbd | |
4737 | * device. For format 2 images this includes determining the image | |
4738 | * id. | |
4739 | */ | |
51344a38 | 4740 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool read_only) |
a30b71b9 AE |
4741 | { |
4742 | int ret; | |
b644de2b | 4743 | int tmp; |
a30b71b9 AE |
4744 | |
4745 | /* | |
4746 | * Get the id from the image id object. If it's not a | |
4747 | * format 2 image, we'll get ENOENT back, and we'll assume | |
4748 | * it's a format 1 image. | |
4749 | */ | |
4750 | ret = rbd_dev_image_id(rbd_dev); | |
4751 | if (ret) | |
c0fba368 AE |
4752 | return ret; |
4753 | rbd_assert(rbd_dev->spec->image_id); | |
4754 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4755 | ||
332bb12d AE |
4756 | ret = rbd_dev_header_name(rbd_dev); |
4757 | if (ret) | |
4758 | goto err_out_format; | |
4759 | ||
b644de2b AE |
4760 | ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
4761 | if (ret) | |
4762 | goto out_header_name; | |
4763 | ||
c0fba368 | 4764 | if (rbd_dev->image_format == 1) |
a30b71b9 AE |
4765 | ret = rbd_dev_v1_probe(rbd_dev); |
4766 | else | |
4767 | ret = rbd_dev_v2_probe(rbd_dev); | |
5655c4d9 | 4768 | if (ret) |
b644de2b | 4769 | goto err_out_watch; |
83a06263 | 4770 | |
9bb81c9b AE |
4771 | ret = rbd_dev_spec_update(rbd_dev); |
4772 | if (ret) | |
33dca39f | 4773 | goto err_out_probe; |
9bb81c9b | 4774 | |
51344a38 AE |
4775 | /* If we are mapping a snapshot it must be marked read-only */ |
4776 | ||
4777 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) | |
4778 | read_only = true; | |
4779 | rbd_dev->mapping.read_only = read_only; | |
4780 | ||
9bb81c9b | 4781 | ret = rbd_dev_probe_parent(rbd_dev); |
6fd48b3b AE |
4782 | if (!ret) |
4783 | return 0; | |
83a06263 | 4784 | |
6fd48b3b AE |
4785 | err_out_probe: |
4786 | rbd_dev_unprobe(rbd_dev); | |
b644de2b AE |
4787 | err_out_watch: |
4788 | tmp = rbd_dev_header_watch_sync(rbd_dev, 0); | |
4789 | if (tmp) | |
4790 | rbd_warn(rbd_dev, "unable to tear down watch request\n"); | |
332bb12d AE |
4791 | out_header_name: |
4792 | kfree(rbd_dev->header_name); | |
4793 | rbd_dev->header_name = NULL; | |
4794 | err_out_format: | |
4795 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
4796 | kfree(rbd_dev->spec->image_id); |
4797 | rbd_dev->spec->image_id = NULL; | |
4798 | ||
4799 | dout("probe failed, returning %d\n", ret); | |
4800 | ||
a30b71b9 AE |
4801 | return ret; |
4802 | } | |
4803 | ||
59c2be1e YS |
4804 | static ssize_t rbd_add(struct bus_type *bus, |
4805 | const char *buf, | |
4806 | size_t count) | |
602adf40 | 4807 | { |
cb8627c7 | 4808 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 4809 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 4810 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4811 | struct rbd_spec *spec = NULL; |
9d3997fd | 4812 | struct rbd_client *rbdc; |
27cc2594 | 4813 | struct ceph_osd_client *osdc; |
51344a38 | 4814 | bool read_only; |
27cc2594 | 4815 | int rc = -ENOMEM; |
602adf40 YS |
4816 | |
4817 | if (!try_module_get(THIS_MODULE)) | |
4818 | return -ENODEV; | |
4819 | ||
602adf40 | 4820 | /* parse add command */ |
859c31df | 4821 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 4822 | if (rc < 0) |
bd4ba655 | 4823 | goto err_out_module; |
51344a38 AE |
4824 | read_only = rbd_opts->read_only; |
4825 | kfree(rbd_opts); | |
4826 | rbd_opts = NULL; /* done with this */ | |
78cea76e | 4827 | |
9d3997fd AE |
4828 | rbdc = rbd_get_client(ceph_opts); |
4829 | if (IS_ERR(rbdc)) { | |
4830 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 4831 | goto err_out_args; |
9d3997fd | 4832 | } |
c53d5893 | 4833 | ceph_opts = NULL; /* rbd_dev client now owns this */ |
602adf40 | 4834 | |
602adf40 | 4835 | /* pick the pool */ |
9d3997fd | 4836 | osdc = &rbdc->client->osdc; |
859c31df | 4837 | rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
602adf40 YS |
4838 | if (rc < 0) |
4839 | goto err_out_client; | |
c0cd10db | 4840 | spec->pool_id = (u64)rc; |
859c31df | 4841 | |
0903e875 AE |
4842 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4843 | ||
c0cd10db AE |
4844 | if (spec->pool_id > (u64)U32_MAX) { |
4845 | rbd_warn(NULL, "pool id too large (%llu > %u)\n", | |
4846 | (unsigned long long)spec->pool_id, U32_MAX); | |
0903e875 AE |
4847 | rc = -EIO; |
4848 | goto err_out_client; | |
4849 | } | |
4850 | ||
c53d5893 | 4851 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
4852 | if (!rbd_dev) |
4853 | goto err_out_client; | |
c53d5893 AE |
4854 | rbdc = NULL; /* rbd_dev now owns this */ |
4855 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 4856 | |
51344a38 | 4857 | rc = rbd_dev_image_probe(rbd_dev, read_only); |
a30b71b9 | 4858 | if (rc < 0) |
c53d5893 | 4859 | goto err_out_rbd_dev; |
05fd6f6f | 4860 | |
b536f69a AE |
4861 | rc = rbd_dev_device_setup(rbd_dev); |
4862 | if (!rc) | |
4863 | return count; | |
4864 | ||
4865 | rbd_dev_image_release(rbd_dev); | |
c53d5893 AE |
4866 | err_out_rbd_dev: |
4867 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 4868 | err_out_client: |
9d3997fd | 4869 | rbd_put_client(rbdc); |
0ddebc0c | 4870 | err_out_args: |
78cea76e AE |
4871 | if (ceph_opts) |
4872 | ceph_destroy_options(ceph_opts); | |
4e9afeba | 4873 | kfree(rbd_opts); |
859c31df | 4874 | rbd_spec_put(spec); |
bd4ba655 AE |
4875 | err_out_module: |
4876 | module_put(THIS_MODULE); | |
27cc2594 | 4877 | |
602adf40 | 4878 | dout("Error adding device %s\n", buf); |
27cc2594 | 4879 | |
c0cd10db | 4880 | return (ssize_t)rc; |
602adf40 YS |
4881 | } |
4882 | ||
de71a297 | 4883 | static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
602adf40 YS |
4884 | { |
4885 | struct list_head *tmp; | |
4886 | struct rbd_device *rbd_dev; | |
4887 | ||
e124a82f | 4888 | spin_lock(&rbd_dev_list_lock); |
602adf40 YS |
4889 | list_for_each(tmp, &rbd_dev_list) { |
4890 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
de71a297 | 4891 | if (rbd_dev->dev_id == dev_id) { |
e124a82f | 4892 | spin_unlock(&rbd_dev_list_lock); |
602adf40 | 4893 | return rbd_dev; |
e124a82f | 4894 | } |
602adf40 | 4895 | } |
e124a82f | 4896 | spin_unlock(&rbd_dev_list_lock); |
602adf40 YS |
4897 | return NULL; |
4898 | } | |
4899 | ||
200a6a8b | 4900 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 4901 | { |
593a9e7b | 4902 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 4903 | |
602adf40 | 4904 | rbd_free_disk(rbd_dev); |
200a6a8b | 4905 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
6d80b130 | 4906 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 | 4907 | unregister_blkdev(rbd_dev->major, rbd_dev->name); |
200a6a8b | 4908 | rbd_dev->major = 0; |
e2839308 | 4909 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 4910 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
4911 | } |
4912 | ||
05a46afd AE |
4913 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
4914 | { | |
ad945fc1 | 4915 | while (rbd_dev->parent) { |
05a46afd AE |
4916 | struct rbd_device *first = rbd_dev; |
4917 | struct rbd_device *second = first->parent; | |
4918 | struct rbd_device *third; | |
4919 | ||
4920 | /* | |
4921 | * Follow to the parent with no grandparent and | |
4922 | * remove it. | |
4923 | */ | |
4924 | while (second && (third = second->parent)) { | |
4925 | first = second; | |
4926 | second = third; | |
4927 | } | |
ad945fc1 | 4928 | rbd_assert(second); |
8ad42cd0 | 4929 | rbd_dev_image_release(second); |
ad945fc1 AE |
4930 | first->parent = NULL; |
4931 | first->parent_overlap = 0; | |
4932 | ||
4933 | rbd_assert(first->parent_spec); | |
05a46afd AE |
4934 | rbd_spec_put(first->parent_spec); |
4935 | first->parent_spec = NULL; | |
05a46afd AE |
4936 | } |
4937 | } | |
4938 | ||
dfc5606d YS |
4939 | static ssize_t rbd_remove(struct bus_type *bus, |
4940 | const char *buf, | |
4941 | size_t count) | |
602adf40 YS |
4942 | { |
4943 | struct rbd_device *rbd_dev = NULL; | |
0d8189e1 | 4944 | int target_id; |
602adf40 | 4945 | unsigned long ul; |
0d8189e1 | 4946 | int ret; |
602adf40 | 4947 | |
0d8189e1 AE |
4948 | ret = strict_strtoul(buf, 10, &ul); |
4949 | if (ret) | |
4950 | return ret; | |
602adf40 YS |
4951 | |
4952 | /* convert to int; abort if we lost anything in the conversion */ | |
4953 | target_id = (int) ul; | |
4954 | if (target_id != ul) | |
4955 | return -EINVAL; | |
4956 | ||
4957 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
4958 | ||
4959 | rbd_dev = __rbd_get_dev(target_id); | |
4960 | if (!rbd_dev) { | |
4961 | ret = -ENOENT; | |
4962 | goto done; | |
42382b70 AE |
4963 | } |
4964 | ||
a14ea269 | 4965 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 4966 | if (rbd_dev->open_count) |
42382b70 | 4967 | ret = -EBUSY; |
b82d167b AE |
4968 | else |
4969 | set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
a14ea269 | 4970 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 4971 | if (ret < 0) |
42382b70 | 4972 | goto done; |
0d8189e1 | 4973 | ret = count; |
b480815a | 4974 | rbd_bus_del_dev(rbd_dev); |
8ad42cd0 | 4975 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 4976 | module_put(THIS_MODULE); |
602adf40 YS |
4977 | done: |
4978 | mutex_unlock(&ctl_mutex); | |
aafb230e | 4979 | |
602adf40 YS |
4980 | return ret; |
4981 | } | |
4982 | ||
602adf40 YS |
4983 | /* |
4984 | * create control files in sysfs | |
dfc5606d | 4985 | * /sys/bus/rbd/... |
602adf40 YS |
4986 | */ |
4987 | static int rbd_sysfs_init(void) | |
4988 | { | |
dfc5606d | 4989 | int ret; |
602adf40 | 4990 | |
fed4c143 | 4991 | ret = device_register(&rbd_root_dev); |
21079786 | 4992 | if (ret < 0) |
dfc5606d | 4993 | return ret; |
602adf40 | 4994 | |
fed4c143 AE |
4995 | ret = bus_register(&rbd_bus_type); |
4996 | if (ret < 0) | |
4997 | device_unregister(&rbd_root_dev); | |
602adf40 | 4998 | |
602adf40 YS |
4999 | return ret; |
5000 | } | |
5001 | ||
5002 | static void rbd_sysfs_cleanup(void) | |
5003 | { | |
dfc5606d | 5004 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5005 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5006 | } |
5007 | ||
1c2a9dfe AE |
5008 | static int rbd_slab_init(void) |
5009 | { | |
5010 | rbd_assert(!rbd_img_request_cache); | |
5011 | rbd_img_request_cache = kmem_cache_create("rbd_img_request", | |
5012 | sizeof (struct rbd_img_request), | |
5013 | __alignof__(struct rbd_img_request), | |
5014 | 0, NULL); | |
868311b1 AE |
5015 | if (!rbd_img_request_cache) |
5016 | return -ENOMEM; | |
5017 | ||
5018 | rbd_assert(!rbd_obj_request_cache); | |
5019 | rbd_obj_request_cache = kmem_cache_create("rbd_obj_request", | |
5020 | sizeof (struct rbd_obj_request), | |
5021 | __alignof__(struct rbd_obj_request), | |
5022 | 0, NULL); | |
78c2a44a AE |
5023 | if (!rbd_obj_request_cache) |
5024 | goto out_err; | |
5025 | ||
5026 | rbd_assert(!rbd_segment_name_cache); | |
5027 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
5028 | MAX_OBJ_NAME_SIZE + 1, 1, 0, NULL); | |
5029 | if (rbd_segment_name_cache) | |
1c2a9dfe | 5030 | return 0; |
78c2a44a AE |
5031 | out_err: |
5032 | if (rbd_obj_request_cache) { | |
5033 | kmem_cache_destroy(rbd_obj_request_cache); | |
5034 | rbd_obj_request_cache = NULL; | |
5035 | } | |
1c2a9dfe | 5036 | |
868311b1 AE |
5037 | kmem_cache_destroy(rbd_img_request_cache); |
5038 | rbd_img_request_cache = NULL; | |
5039 | ||
1c2a9dfe AE |
5040 | return -ENOMEM; |
5041 | } | |
5042 | ||
5043 | static void rbd_slab_exit(void) | |
5044 | { | |
78c2a44a AE |
5045 | rbd_assert(rbd_segment_name_cache); |
5046 | kmem_cache_destroy(rbd_segment_name_cache); | |
5047 | rbd_segment_name_cache = NULL; | |
5048 | ||
868311b1 AE |
5049 | rbd_assert(rbd_obj_request_cache); |
5050 | kmem_cache_destroy(rbd_obj_request_cache); | |
5051 | rbd_obj_request_cache = NULL; | |
5052 | ||
1c2a9dfe AE |
5053 | rbd_assert(rbd_img_request_cache); |
5054 | kmem_cache_destroy(rbd_img_request_cache); | |
5055 | rbd_img_request_cache = NULL; | |
5056 | } | |
5057 | ||
cc344fa1 | 5058 | static int __init rbd_init(void) |
602adf40 YS |
5059 | { |
5060 | int rc; | |
5061 | ||
1e32d34c AE |
5062 | if (!libceph_compatible(NULL)) { |
5063 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
5064 | ||
5065 | return -EINVAL; | |
5066 | } | |
1c2a9dfe | 5067 | rc = rbd_slab_init(); |
602adf40 YS |
5068 | if (rc) |
5069 | return rc; | |
1c2a9dfe AE |
5070 | rc = rbd_sysfs_init(); |
5071 | if (rc) | |
5072 | rbd_slab_exit(); | |
5073 | else | |
5074 | pr_info("loaded " RBD_DRV_NAME_LONG "\n"); | |
5075 | ||
5076 | return rc; | |
602adf40 YS |
5077 | } |
5078 | ||
cc344fa1 | 5079 | static void __exit rbd_exit(void) |
602adf40 YS |
5080 | { |
5081 | rbd_sysfs_cleanup(); | |
1c2a9dfe | 5082 | rbd_slab_exit(); |
602adf40 YS |
5083 | } |
5084 | ||
5085 | module_init(rbd_init); | |
5086 | module_exit(rbd_exit); | |
5087 | ||
5088 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
5089 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
5090 | MODULE_DESCRIPTION("rados block device"); | |
5091 | ||
5092 | /* following authorship retained from original osdblk.c */ | |
5093 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5094 | ||
5095 | MODULE_LICENSE("GPL"); |