Commit | Line | Data |
---|---|---|
e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
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> |
f8a22fc2 | 44 | #include <linux/idr.h> |
602adf40 YS |
45 | |
46 | #include "rbd_types.h" | |
47 | ||
aafb230e AE |
48 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
49 | ||
593a9e7b AE |
50 | /* |
51 | * The basic unit of block I/O is a sector. It is interpreted in a | |
52 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
53 | * universally 512 bytes. These symbols are just slightly more | |
54 | * meaningful than the bare numbers they represent. | |
55 | */ | |
56 | #define SECTOR_SHIFT 9 | |
57 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
58 | ||
a2acd00e AE |
59 | /* |
60 | * Increment the given counter and return its updated value. | |
61 | * If the counter is already 0 it will not be incremented. | |
62 | * If the counter is already at its maximum value returns | |
63 | * -EINVAL without updating it. | |
64 | */ | |
65 | static int atomic_inc_return_safe(atomic_t *v) | |
66 | { | |
67 | unsigned int counter; | |
68 | ||
69 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
70 | if (counter <= (unsigned int)INT_MAX) | |
71 | return (int)counter; | |
72 | ||
73 | atomic_dec(v); | |
74 | ||
75 | return -EINVAL; | |
76 | } | |
77 | ||
78 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
79 | static int atomic_dec_return_safe(atomic_t *v) | |
80 | { | |
81 | int counter; | |
82 | ||
83 | counter = atomic_dec_return(v); | |
84 | if (counter >= 0) | |
85 | return counter; | |
86 | ||
87 | atomic_inc(v); | |
88 | ||
89 | return -EINVAL; | |
90 | } | |
91 | ||
f0f8cef5 | 92 | #define RBD_DRV_NAME "rbd" |
602adf40 | 93 | |
7e513d43 ID |
94 | #define RBD_MINORS_PER_MAJOR 256 |
95 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 96 | |
d4b125e9 AE |
97 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
98 | #define RBD_MAX_SNAP_NAME_LEN \ | |
99 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
100 | ||
35d489f9 | 101 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
102 | |
103 | #define RBD_SNAP_HEAD_NAME "-" | |
104 | ||
9682fc6d AE |
105 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
106 | ||
9e15b77d AE |
107 | /* This allows a single page to hold an image name sent by OSD */ |
108 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 109 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 110 | |
1e130199 | 111 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 112 | |
d889140c AE |
113 | /* Feature bits */ |
114 | ||
5cbf6f12 AE |
115 | #define RBD_FEATURE_LAYERING (1<<0) |
116 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
117 | #define RBD_FEATURES_ALL \ | |
118 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
119 | |
120 | /* Features supported by this (client software) implementation. */ | |
121 | ||
770eba6e | 122 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 123 | |
81a89793 AE |
124 | /* |
125 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
126 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
127 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
128 | * enough to hold all possible device names. | |
129 | */ | |
602adf40 | 130 | #define DEV_NAME_LEN 32 |
81a89793 | 131 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
132 | |
133 | /* | |
134 | * block device image metadata (in-memory version) | |
135 | */ | |
136 | struct rbd_image_header { | |
f35a4dee | 137 | /* These six fields never change for a given rbd image */ |
849b4260 | 138 | char *object_prefix; |
602adf40 YS |
139 | __u8 obj_order; |
140 | __u8 crypt_type; | |
141 | __u8 comp_type; | |
f35a4dee AE |
142 | u64 stripe_unit; |
143 | u64 stripe_count; | |
144 | u64 features; /* Might be changeable someday? */ | |
602adf40 | 145 | |
f84344f3 AE |
146 | /* The remaining fields need to be updated occasionally */ |
147 | u64 image_size; | |
148 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
149 | char *snap_names; /* format 1 only */ |
150 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
151 | }; |
152 | ||
0d7dbfce AE |
153 | /* |
154 | * An rbd image specification. | |
155 | * | |
156 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
157 | * identify an image. Each rbd_dev structure includes a pointer to |
158 | * an rbd_spec structure that encapsulates this identity. | |
159 | * | |
160 | * Each of the id's in an rbd_spec has an associated name. For a | |
161 | * user-mapped image, the names are supplied and the id's associated | |
162 | * with them are looked up. For a layered image, a parent image is | |
163 | * defined by the tuple, and the names are looked up. | |
164 | * | |
165 | * An rbd_dev structure contains a parent_spec pointer which is | |
166 | * non-null if the image it represents is a child in a layered | |
167 | * image. This pointer will refer to the rbd_spec structure used | |
168 | * by the parent rbd_dev for its own identity (i.e., the structure | |
169 | * is shared between the parent and child). | |
170 | * | |
171 | * Since these structures are populated once, during the discovery | |
172 | * phase of image construction, they are effectively immutable so | |
173 | * we make no effort to synchronize access to them. | |
174 | * | |
175 | * Note that code herein does not assume the image name is known (it | |
176 | * could be a null pointer). | |
0d7dbfce AE |
177 | */ |
178 | struct rbd_spec { | |
179 | u64 pool_id; | |
ecb4dc22 | 180 | const char *pool_name; |
0d7dbfce | 181 | |
ecb4dc22 AE |
182 | const char *image_id; |
183 | const char *image_name; | |
0d7dbfce AE |
184 | |
185 | u64 snap_id; | |
ecb4dc22 | 186 | const char *snap_name; |
0d7dbfce AE |
187 | |
188 | struct kref kref; | |
189 | }; | |
190 | ||
602adf40 | 191 | /* |
f0f8cef5 | 192 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
193 | */ |
194 | struct rbd_client { | |
195 | struct ceph_client *client; | |
196 | struct kref kref; | |
197 | struct list_head node; | |
198 | }; | |
199 | ||
bf0d5f50 AE |
200 | struct rbd_img_request; |
201 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
202 | ||
203 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
204 | ||
205 | struct rbd_obj_request; | |
206 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
207 | ||
9969ebc5 AE |
208 | enum obj_request_type { |
209 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
210 | }; | |
bf0d5f50 | 211 | |
926f9b3f AE |
212 | enum obj_req_flags { |
213 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 214 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
215 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
216 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
217 | }; |
218 | ||
bf0d5f50 AE |
219 | struct rbd_obj_request { |
220 | const char *object_name; | |
221 | u64 offset; /* object start byte */ | |
222 | u64 length; /* bytes from offset */ | |
926f9b3f | 223 | unsigned long flags; |
bf0d5f50 | 224 | |
c5b5ef6c AE |
225 | /* |
226 | * An object request associated with an image will have its | |
227 | * img_data flag set; a standalone object request will not. | |
228 | * | |
229 | * A standalone object request will have which == BAD_WHICH | |
230 | * and a null obj_request pointer. | |
231 | * | |
232 | * An object request initiated in support of a layered image | |
233 | * object (to check for its existence before a write) will | |
234 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
235 | * | |
236 | * Finally, an object request for rbd image data will have | |
237 | * which != BAD_WHICH, and will have a non-null img_request | |
238 | * pointer. The value of which will be in the range | |
239 | * 0..(img_request->obj_request_count-1). | |
240 | */ | |
241 | union { | |
242 | struct rbd_obj_request *obj_request; /* STAT op */ | |
243 | struct { | |
244 | struct rbd_img_request *img_request; | |
245 | u64 img_offset; | |
246 | /* links for img_request->obj_requests list */ | |
247 | struct list_head links; | |
248 | }; | |
249 | }; | |
bf0d5f50 AE |
250 | u32 which; /* posn image request list */ |
251 | ||
252 | enum obj_request_type type; | |
788e2df3 AE |
253 | union { |
254 | struct bio *bio_list; | |
255 | struct { | |
256 | struct page **pages; | |
257 | u32 page_count; | |
258 | }; | |
259 | }; | |
0eefd470 | 260 | struct page **copyup_pages; |
ebda6408 | 261 | u32 copyup_page_count; |
bf0d5f50 AE |
262 | |
263 | struct ceph_osd_request *osd_req; | |
264 | ||
265 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 266 | int result; |
bf0d5f50 AE |
267 | |
268 | rbd_obj_callback_t callback; | |
788e2df3 | 269 | struct completion completion; |
bf0d5f50 AE |
270 | |
271 | struct kref kref; | |
272 | }; | |
273 | ||
0c425248 | 274 | enum img_req_flags { |
9849e986 AE |
275 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
276 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 277 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
278 | }; |
279 | ||
bf0d5f50 | 280 | struct rbd_img_request { |
bf0d5f50 AE |
281 | struct rbd_device *rbd_dev; |
282 | u64 offset; /* starting image byte offset */ | |
283 | u64 length; /* byte count from offset */ | |
0c425248 | 284 | unsigned long flags; |
bf0d5f50 | 285 | union { |
9849e986 | 286 | u64 snap_id; /* for reads */ |
bf0d5f50 | 287 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
288 | }; |
289 | union { | |
290 | struct request *rq; /* block request */ | |
291 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 292 | }; |
3d7efd18 | 293 | struct page **copyup_pages; |
ebda6408 | 294 | u32 copyup_page_count; |
bf0d5f50 AE |
295 | spinlock_t completion_lock;/* protects next_completion */ |
296 | u32 next_completion; | |
297 | rbd_img_callback_t callback; | |
55f27e09 | 298 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 299 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
300 | |
301 | u32 obj_request_count; | |
302 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
303 | ||
304 | struct kref kref; | |
305 | }; | |
306 | ||
307 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 308 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 309 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 310 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 311 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 312 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 313 | |
f84344f3 | 314 | struct rbd_mapping { |
99c1f08f | 315 | u64 size; |
34b13184 | 316 | u64 features; |
f84344f3 AE |
317 | bool read_only; |
318 | }; | |
319 | ||
602adf40 YS |
320 | /* |
321 | * a single device | |
322 | */ | |
323 | struct rbd_device { | |
de71a297 | 324 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
325 | |
326 | int major; /* blkdev assigned major */ | |
dd82fff1 | 327 | int minor; |
602adf40 | 328 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 329 | |
a30b71b9 | 330 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
331 | struct rbd_client *rbd_client; |
332 | ||
333 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
334 | ||
b82d167b | 335 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
336 | |
337 | struct rbd_image_header header; | |
b82d167b | 338 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 339 | struct rbd_spec *spec; |
602adf40 | 340 | |
0d7dbfce | 341 | char *header_name; |
971f839a | 342 | |
0903e875 AE |
343 | struct ceph_file_layout layout; |
344 | ||
59c2be1e | 345 | struct ceph_osd_event *watch_event; |
975241af | 346 | struct rbd_obj_request *watch_request; |
59c2be1e | 347 | |
86b00e0d AE |
348 | struct rbd_spec *parent_spec; |
349 | u64 parent_overlap; | |
a2acd00e | 350 | atomic_t parent_ref; |
2f82ee54 | 351 | struct rbd_device *parent; |
86b00e0d | 352 | |
c666601a JD |
353 | /* protects updating the header */ |
354 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
355 | |
356 | struct rbd_mapping mapping; | |
602adf40 YS |
357 | |
358 | struct list_head node; | |
dfc5606d | 359 | |
dfc5606d YS |
360 | /* sysfs related */ |
361 | struct device dev; | |
b82d167b | 362 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
363 | }; |
364 | ||
b82d167b AE |
365 | /* |
366 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
367 | * rbd_dev->lock is used to protect access. | |
368 | * | |
369 | * Currently, only the "removing" flag (which is coupled with the | |
370 | * "open_count" field) requires atomic access. | |
371 | */ | |
6d292906 AE |
372 | enum rbd_dev_flags { |
373 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 374 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
375 | }; |
376 | ||
cfbf6377 | 377 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 378 | |
602adf40 | 379 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
380 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
381 | ||
432b8587 AE |
382 | static LIST_HEAD(rbd_client_list); /* clients */ |
383 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 384 | |
78c2a44a AE |
385 | /* Slab caches for frequently-allocated structures */ |
386 | ||
1c2a9dfe | 387 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 388 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 389 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 390 | |
9b60e70b | 391 | static int rbd_major; |
f8a22fc2 ID |
392 | static DEFINE_IDA(rbd_dev_id_ida); |
393 | ||
9b60e70b ID |
394 | /* |
395 | * Default to false for now, as single-major requires >= 0.75 version of | |
396 | * userspace rbd utility. | |
397 | */ | |
398 | static bool single_major = false; | |
399 | module_param(single_major, bool, S_IRUGO); | |
400 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); | |
401 | ||
3d7efd18 AE |
402 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
403 | ||
200a6a8b | 404 | static void rbd_dev_device_release(struct device *dev); |
dfc5606d | 405 | |
f0f8cef5 AE |
406 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
407 | size_t count); | |
408 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
409 | size_t count); | |
9b60e70b ID |
410 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
411 | size_t count); | |
412 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
413 | size_t count); | |
1f3ef788 | 414 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping); |
a2acd00e | 415 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 416 | |
9b60e70b ID |
417 | static int rbd_dev_id_to_minor(int dev_id) |
418 | { | |
7e513d43 | 419 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
420 | } |
421 | ||
422 | static int minor_to_rbd_dev_id(int minor) | |
423 | { | |
7e513d43 | 424 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
425 | } |
426 | ||
b15a21dd GKH |
427 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
428 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
429 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
430 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
b15a21dd GKH |
431 | |
432 | static struct attribute *rbd_bus_attrs[] = { | |
433 | &bus_attr_add.attr, | |
434 | &bus_attr_remove.attr, | |
9b60e70b ID |
435 | &bus_attr_add_single_major.attr, |
436 | &bus_attr_remove_single_major.attr, | |
b15a21dd | 437 | NULL, |
f0f8cef5 | 438 | }; |
92c76dc0 ID |
439 | |
440 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
441 | struct attribute *attr, int index) | |
442 | { | |
9b60e70b ID |
443 | if (!single_major && |
444 | (attr == &bus_attr_add_single_major.attr || | |
445 | attr == &bus_attr_remove_single_major.attr)) | |
446 | return 0; | |
447 | ||
92c76dc0 ID |
448 | return attr->mode; |
449 | } | |
450 | ||
451 | static const struct attribute_group rbd_bus_group = { | |
452 | .attrs = rbd_bus_attrs, | |
453 | .is_visible = rbd_bus_is_visible, | |
454 | }; | |
455 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
456 | |
457 | static struct bus_type rbd_bus_type = { | |
458 | .name = "rbd", | |
b15a21dd | 459 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
460 | }; |
461 | ||
462 | static void rbd_root_dev_release(struct device *dev) | |
463 | { | |
464 | } | |
465 | ||
466 | static struct device rbd_root_dev = { | |
467 | .init_name = "rbd", | |
468 | .release = rbd_root_dev_release, | |
469 | }; | |
470 | ||
06ecc6cb AE |
471 | static __printf(2, 3) |
472 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
473 | { | |
474 | struct va_format vaf; | |
475 | va_list args; | |
476 | ||
477 | va_start(args, fmt); | |
478 | vaf.fmt = fmt; | |
479 | vaf.va = &args; | |
480 | ||
481 | if (!rbd_dev) | |
482 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
483 | else if (rbd_dev->disk) | |
484 | printk(KERN_WARNING "%s: %s: %pV\n", | |
485 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
486 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
487 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
488 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
489 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
490 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
491 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
492 | else /* punt */ | |
493 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
494 | RBD_DRV_NAME, rbd_dev, &vaf); | |
495 | va_end(args); | |
496 | } | |
497 | ||
aafb230e AE |
498 | #ifdef RBD_DEBUG |
499 | #define rbd_assert(expr) \ | |
500 | if (unlikely(!(expr))) { \ | |
501 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
502 | "at line %d:\n\n" \ | |
503 | "\trbd_assert(%s);\n\n", \ | |
504 | __func__, __LINE__, #expr); \ | |
505 | BUG(); \ | |
506 | } | |
507 | #else /* !RBD_DEBUG */ | |
508 | # define rbd_assert(expr) ((void) 0) | |
509 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 510 | |
b454e36d | 511 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
512 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
513 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 514 | |
cc4a38bd | 515 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 AE |
516 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
517 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev); | |
54cac61f AE |
518 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
519 | u64 snap_id); | |
2ad3d716 AE |
520 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
521 | u8 *order, u64 *snap_size); | |
522 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
523 | u64 *snap_features); | |
524 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); | |
59c2be1e | 525 | |
602adf40 YS |
526 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
527 | { | |
f0f8cef5 | 528 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 529 | bool removing = false; |
602adf40 | 530 | |
f84344f3 | 531 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
532 | return -EROFS; |
533 | ||
a14ea269 | 534 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
535 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
536 | removing = true; | |
537 | else | |
538 | rbd_dev->open_count++; | |
a14ea269 | 539 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
540 | if (removing) |
541 | return -ENOENT; | |
542 | ||
c3e946ce | 543 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 544 | |
602adf40 YS |
545 | return 0; |
546 | } | |
547 | ||
db2a144b | 548 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
549 | { |
550 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
551 | unsigned long open_count_before; |
552 | ||
a14ea269 | 553 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 554 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 555 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 556 | rbd_assert(open_count_before > 0); |
dfc5606d | 557 | |
c3e946ce | 558 | put_device(&rbd_dev->dev); |
dfc5606d YS |
559 | } |
560 | ||
131fd9f6 GZ |
561 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
562 | { | |
77f33c03 | 563 | int ret = 0; |
131fd9f6 GZ |
564 | int val; |
565 | bool ro; | |
77f33c03 | 566 | bool ro_changed = false; |
131fd9f6 | 567 | |
77f33c03 | 568 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
131fd9f6 GZ |
569 | if (get_user(val, (int __user *)(arg))) |
570 | return -EFAULT; | |
571 | ||
572 | ro = val ? true : false; | |
573 | /* Snapshot doesn't allow to write*/ | |
574 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) | |
575 | return -EROFS; | |
576 | ||
77f33c03 JD |
577 | spin_lock_irq(&rbd_dev->lock); |
578 | /* prevent others open this device */ | |
579 | if (rbd_dev->open_count > 1) { | |
580 | ret = -EBUSY; | |
581 | goto out; | |
582 | } | |
583 | ||
131fd9f6 GZ |
584 | if (rbd_dev->mapping.read_only != ro) { |
585 | rbd_dev->mapping.read_only = ro; | |
77f33c03 | 586 | ro_changed = true; |
131fd9f6 GZ |
587 | } |
588 | ||
77f33c03 JD |
589 | out: |
590 | spin_unlock_irq(&rbd_dev->lock); | |
591 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ | |
592 | if (ret == 0 && ro_changed) | |
593 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); | |
594 | ||
595 | return ret; | |
131fd9f6 GZ |
596 | } |
597 | ||
598 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
599 | unsigned int cmd, unsigned long arg) | |
600 | { | |
601 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
602 | int ret = 0; | |
603 | ||
131fd9f6 GZ |
604 | switch (cmd) { |
605 | case BLKROSET: | |
606 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
607 | break; | |
608 | default: | |
609 | ret = -ENOTTY; | |
610 | } | |
611 | ||
131fd9f6 GZ |
612 | return ret; |
613 | } | |
614 | ||
615 | #ifdef CONFIG_COMPAT | |
616 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
617 | unsigned int cmd, unsigned long arg) | |
618 | { | |
619 | return rbd_ioctl(bdev, mode, cmd, arg); | |
620 | } | |
621 | #endif /* CONFIG_COMPAT */ | |
622 | ||
602adf40 YS |
623 | static const struct block_device_operations rbd_bd_ops = { |
624 | .owner = THIS_MODULE, | |
625 | .open = rbd_open, | |
dfc5606d | 626 | .release = rbd_release, |
131fd9f6 GZ |
627 | .ioctl = rbd_ioctl, |
628 | #ifdef CONFIG_COMPAT | |
629 | .compat_ioctl = rbd_compat_ioctl, | |
630 | #endif | |
602adf40 YS |
631 | }; |
632 | ||
633 | /* | |
7262cfca | 634 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 635 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 636 | */ |
f8c38929 | 637 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
638 | { |
639 | struct rbd_client *rbdc; | |
640 | int ret = -ENOMEM; | |
641 | ||
37206ee5 | 642 | dout("%s:\n", __func__); |
602adf40 YS |
643 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
644 | if (!rbdc) | |
645 | goto out_opt; | |
646 | ||
647 | kref_init(&rbdc->kref); | |
648 | INIT_LIST_HEAD(&rbdc->node); | |
649 | ||
43ae4701 | 650 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 651 | if (IS_ERR(rbdc->client)) |
08f75463 | 652 | goto out_rbdc; |
43ae4701 | 653 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
654 | |
655 | ret = ceph_open_session(rbdc->client); | |
656 | if (ret < 0) | |
08f75463 | 657 | goto out_client; |
602adf40 | 658 | |
432b8587 | 659 | spin_lock(&rbd_client_list_lock); |
602adf40 | 660 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 661 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 662 | |
37206ee5 | 663 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 664 | |
602adf40 | 665 | return rbdc; |
08f75463 | 666 | out_client: |
602adf40 | 667 | ceph_destroy_client(rbdc->client); |
08f75463 | 668 | out_rbdc: |
602adf40 YS |
669 | kfree(rbdc); |
670 | out_opt: | |
43ae4701 AE |
671 | if (ceph_opts) |
672 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
673 | dout("%s: error %d\n", __func__, ret); |
674 | ||
28f259b7 | 675 | return ERR_PTR(ret); |
602adf40 YS |
676 | } |
677 | ||
2f82ee54 AE |
678 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
679 | { | |
680 | kref_get(&rbdc->kref); | |
681 | ||
682 | return rbdc; | |
683 | } | |
684 | ||
602adf40 | 685 | /* |
1f7ba331 AE |
686 | * Find a ceph client with specific addr and configuration. If |
687 | * found, bump its reference count. | |
602adf40 | 688 | */ |
1f7ba331 | 689 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
690 | { |
691 | struct rbd_client *client_node; | |
1f7ba331 | 692 | bool found = false; |
602adf40 | 693 | |
43ae4701 | 694 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
695 | return NULL; |
696 | ||
1f7ba331 AE |
697 | spin_lock(&rbd_client_list_lock); |
698 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
699 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
700 | __rbd_get_client(client_node); |
701 | ||
1f7ba331 AE |
702 | found = true; |
703 | break; | |
704 | } | |
705 | } | |
706 | spin_unlock(&rbd_client_list_lock); | |
707 | ||
708 | return found ? client_node : NULL; | |
602adf40 YS |
709 | } |
710 | ||
59c2be1e YS |
711 | /* |
712 | * mount options | |
713 | */ | |
714 | enum { | |
59c2be1e YS |
715 | Opt_last_int, |
716 | /* int args above */ | |
717 | Opt_last_string, | |
718 | /* string args above */ | |
cc0538b6 AE |
719 | Opt_read_only, |
720 | Opt_read_write, | |
721 | /* Boolean args above */ | |
722 | Opt_last_bool, | |
59c2be1e YS |
723 | }; |
724 | ||
43ae4701 | 725 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
726 | /* int args above */ |
727 | /* string args above */ | |
be466c1c | 728 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
729 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
730 | {Opt_read_write, "read_write"}, | |
731 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
732 | /* Boolean args above */ | |
59c2be1e YS |
733 | {-1, NULL} |
734 | }; | |
735 | ||
98571b5a AE |
736 | struct rbd_options { |
737 | bool read_only; | |
738 | }; | |
739 | ||
740 | #define RBD_READ_ONLY_DEFAULT false | |
741 | ||
59c2be1e YS |
742 | static int parse_rbd_opts_token(char *c, void *private) |
743 | { | |
43ae4701 | 744 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
745 | substring_t argstr[MAX_OPT_ARGS]; |
746 | int token, intval, ret; | |
747 | ||
43ae4701 | 748 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
749 | if (token < 0) |
750 | return -EINVAL; | |
751 | ||
752 | if (token < Opt_last_int) { | |
753 | ret = match_int(&argstr[0], &intval); | |
754 | if (ret < 0) { | |
755 | pr_err("bad mount option arg (not int) " | |
756 | "at '%s'\n", c); | |
757 | return ret; | |
758 | } | |
759 | dout("got int token %d val %d\n", token, intval); | |
760 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
761 | dout("got string token %d val %s\n", token, | |
762 | argstr[0].from); | |
cc0538b6 AE |
763 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
764 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
765 | } else { |
766 | dout("got token %d\n", token); | |
767 | } | |
768 | ||
769 | switch (token) { | |
cc0538b6 AE |
770 | case Opt_read_only: |
771 | rbd_opts->read_only = true; | |
772 | break; | |
773 | case Opt_read_write: | |
774 | rbd_opts->read_only = false; | |
775 | break; | |
59c2be1e | 776 | default: |
aafb230e AE |
777 | rbd_assert(false); |
778 | break; | |
59c2be1e YS |
779 | } |
780 | return 0; | |
781 | } | |
782 | ||
602adf40 YS |
783 | /* |
784 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
785 | * not exist create it. Either way, ceph_opts is consumed by this |
786 | * function. | |
602adf40 | 787 | */ |
9d3997fd | 788 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 789 | { |
f8c38929 | 790 | struct rbd_client *rbdc; |
59c2be1e | 791 | |
cfbf6377 | 792 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 793 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 794 | if (rbdc) /* using an existing client */ |
43ae4701 | 795 | ceph_destroy_options(ceph_opts); |
9d3997fd | 796 | else |
f8c38929 | 797 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 798 | mutex_unlock(&client_mutex); |
602adf40 | 799 | |
9d3997fd | 800 | return rbdc; |
602adf40 YS |
801 | } |
802 | ||
803 | /* | |
804 | * Destroy ceph client | |
d23a4b3f | 805 | * |
432b8587 | 806 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
807 | */ |
808 | static void rbd_client_release(struct kref *kref) | |
809 | { | |
810 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
811 | ||
37206ee5 | 812 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 813 | spin_lock(&rbd_client_list_lock); |
602adf40 | 814 | list_del(&rbdc->node); |
cd9d9f5d | 815 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
816 | |
817 | ceph_destroy_client(rbdc->client); | |
818 | kfree(rbdc); | |
819 | } | |
820 | ||
821 | /* | |
822 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
823 | * it. | |
824 | */ | |
9d3997fd | 825 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 826 | { |
c53d5893 AE |
827 | if (rbdc) |
828 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
829 | } |
830 | ||
a30b71b9 AE |
831 | static bool rbd_image_format_valid(u32 image_format) |
832 | { | |
833 | return image_format == 1 || image_format == 2; | |
834 | } | |
835 | ||
8e94af8e AE |
836 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
837 | { | |
103a150f AE |
838 | size_t size; |
839 | u32 snap_count; | |
840 | ||
841 | /* The header has to start with the magic rbd header text */ | |
842 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
843 | return false; | |
844 | ||
db2388b6 AE |
845 | /* The bio layer requires at least sector-sized I/O */ |
846 | ||
847 | if (ondisk->options.order < SECTOR_SHIFT) | |
848 | return false; | |
849 | ||
850 | /* If we use u64 in a few spots we may be able to loosen this */ | |
851 | ||
852 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
853 | return false; | |
854 | ||
103a150f AE |
855 | /* |
856 | * The size of a snapshot header has to fit in a size_t, and | |
857 | * that limits the number of snapshots. | |
858 | */ | |
859 | snap_count = le32_to_cpu(ondisk->snap_count); | |
860 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
861 | if (snap_count > size / sizeof (__le64)) | |
862 | return false; | |
863 | ||
864 | /* | |
865 | * Not only that, but the size of the entire the snapshot | |
866 | * header must also be representable in a size_t. | |
867 | */ | |
868 | size -= snap_count * sizeof (__le64); | |
869 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
870 | return false; | |
871 | ||
872 | return true; | |
8e94af8e AE |
873 | } |
874 | ||
602adf40 | 875 | /* |
bb23e37a AE |
876 | * Fill an rbd image header with information from the given format 1 |
877 | * on-disk header. | |
602adf40 | 878 | */ |
662518b1 | 879 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 880 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 881 | { |
662518b1 | 882 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
883 | bool first_time = header->object_prefix == NULL; |
884 | struct ceph_snap_context *snapc; | |
885 | char *object_prefix = NULL; | |
886 | char *snap_names = NULL; | |
887 | u64 *snap_sizes = NULL; | |
ccece235 | 888 | u32 snap_count; |
d2bb24e5 | 889 | size_t size; |
bb23e37a | 890 | int ret = -ENOMEM; |
621901d6 | 891 | u32 i; |
602adf40 | 892 | |
bb23e37a | 893 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 894 | |
bb23e37a AE |
895 | if (first_time) { |
896 | size_t len; | |
103a150f | 897 | |
bb23e37a AE |
898 | len = strnlen(ondisk->object_prefix, |
899 | sizeof (ondisk->object_prefix)); | |
900 | object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
901 | if (!object_prefix) | |
902 | return -ENOMEM; | |
903 | memcpy(object_prefix, ondisk->object_prefix, len); | |
904 | object_prefix[len] = '\0'; | |
905 | } | |
00f1f36f | 906 | |
bb23e37a | 907 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 908 | |
bb23e37a AE |
909 | snap_count = le32_to_cpu(ondisk->snap_count); |
910 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
911 | if (!snapc) | |
912 | goto out_err; | |
913 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 914 | if (snap_count) { |
bb23e37a | 915 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
916 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
917 | ||
bb23e37a | 918 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 919 | |
bb23e37a AE |
920 | if (snap_names_len > (u64)SIZE_MAX) |
921 | goto out_2big; | |
922 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
923 | if (!snap_names) | |
6a52325f AE |
924 | goto out_err; |
925 | ||
bb23e37a | 926 | /* ...as well as the array of their sizes. */ |
621901d6 | 927 | |
d2bb24e5 | 928 | size = snap_count * sizeof (*header->snap_sizes); |
bb23e37a AE |
929 | snap_sizes = kmalloc(size, GFP_KERNEL); |
930 | if (!snap_sizes) | |
6a52325f | 931 | goto out_err; |
bb23e37a | 932 | |
f785cc1d | 933 | /* |
bb23e37a AE |
934 | * Copy the names, and fill in each snapshot's id |
935 | * and size. | |
936 | * | |
99a41ebc | 937 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 938 | * ondisk buffer we're working with has |
f785cc1d AE |
939 | * snap_names_len bytes beyond the end of the |
940 | * snapshot id array, this memcpy() is safe. | |
941 | */ | |
bb23e37a AE |
942 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
943 | snaps = ondisk->snaps; | |
944 | for (i = 0; i < snap_count; i++) { | |
945 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
946 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
947 | } | |
602adf40 | 948 | } |
6a52325f | 949 | |
bb23e37a | 950 | /* We won't fail any more, fill in the header */ |
621901d6 | 951 | |
bb23e37a AE |
952 | if (first_time) { |
953 | header->object_prefix = object_prefix; | |
954 | header->obj_order = ondisk->options.order; | |
955 | header->crypt_type = ondisk->options.crypt_type; | |
956 | header->comp_type = ondisk->options.comp_type; | |
957 | /* The rest aren't used for format 1 images */ | |
958 | header->stripe_unit = 0; | |
959 | header->stripe_count = 0; | |
960 | header->features = 0; | |
602adf40 | 961 | } else { |
662518b1 AE |
962 | ceph_put_snap_context(header->snapc); |
963 | kfree(header->snap_names); | |
964 | kfree(header->snap_sizes); | |
602adf40 | 965 | } |
849b4260 | 966 | |
bb23e37a | 967 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 968 | |
f84344f3 | 969 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
970 | header->snapc = snapc; |
971 | header->snap_names = snap_names; | |
972 | header->snap_sizes = snap_sizes; | |
468521c1 | 973 | |
662518b1 | 974 | /* Make sure mapping size is consistent with header info */ |
602adf40 | 975 | |
662518b1 AE |
976 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP || first_time) |
977 | if (rbd_dev->mapping.size != header->image_size) | |
978 | rbd_dev->mapping.size = header->image_size; | |
979 | ||
602adf40 | 980 | return 0; |
bb23e37a AE |
981 | out_2big: |
982 | ret = -EIO; | |
6a52325f | 983 | out_err: |
bb23e37a AE |
984 | kfree(snap_sizes); |
985 | kfree(snap_names); | |
986 | ceph_put_snap_context(snapc); | |
987 | kfree(object_prefix); | |
ccece235 | 988 | |
bb23e37a | 989 | return ret; |
602adf40 YS |
990 | } |
991 | ||
9682fc6d AE |
992 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
993 | { | |
994 | const char *snap_name; | |
995 | ||
996 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
997 | ||
998 | /* Skip over names until we find the one we are looking for */ | |
999 | ||
1000 | snap_name = rbd_dev->header.snap_names; | |
1001 | while (which--) | |
1002 | snap_name += strlen(snap_name) + 1; | |
1003 | ||
1004 | return kstrdup(snap_name, GFP_KERNEL); | |
1005 | } | |
1006 | ||
30d1cff8 AE |
1007 | /* |
1008 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1009 | * Note that result is for snapshots in *descending* order. | |
1010 | */ | |
1011 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1012 | { | |
1013 | u64 snap_id1 = *(u64 *)s1; | |
1014 | u64 snap_id2 = *(u64 *)s2; | |
1015 | ||
1016 | if (snap_id1 < snap_id2) | |
1017 | return 1; | |
1018 | return snap_id1 == snap_id2 ? 0 : -1; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Search a snapshot context to see if the given snapshot id is | |
1023 | * present. | |
1024 | * | |
1025 | * Returns the position of the snapshot id in the array if it's found, | |
1026 | * or BAD_SNAP_INDEX otherwise. | |
1027 | * | |
1028 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1029 | * reverse order, highest snapshot id first. | |
1030 | */ | |
9682fc6d AE |
1031 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1032 | { | |
1033 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1034 | u64 *found; |
9682fc6d | 1035 | |
30d1cff8 AE |
1036 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1037 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1038 | |
30d1cff8 | 1039 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1040 | } |
1041 | ||
2ad3d716 AE |
1042 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1043 | u64 snap_id) | |
9e15b77d | 1044 | { |
54cac61f | 1045 | u32 which; |
da6a6b63 | 1046 | const char *snap_name; |
9e15b77d | 1047 | |
54cac61f AE |
1048 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1049 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1050 | return ERR_PTR(-ENOENT); |
54cac61f | 1051 | |
da6a6b63 JD |
1052 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1053 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1054 | } |
1055 | ||
1056 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1057 | { | |
9e15b77d AE |
1058 | if (snap_id == CEPH_NOSNAP) |
1059 | return RBD_SNAP_HEAD_NAME; | |
1060 | ||
54cac61f AE |
1061 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1062 | if (rbd_dev->image_format == 1) | |
1063 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1064 | |
54cac61f | 1065 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1066 | } |
1067 | ||
2ad3d716 AE |
1068 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1069 | u64 *snap_size) | |
602adf40 | 1070 | { |
2ad3d716 AE |
1071 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1072 | if (snap_id == CEPH_NOSNAP) { | |
1073 | *snap_size = rbd_dev->header.image_size; | |
1074 | } else if (rbd_dev->image_format == 1) { | |
1075 | u32 which; | |
602adf40 | 1076 | |
2ad3d716 AE |
1077 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1078 | if (which == BAD_SNAP_INDEX) | |
1079 | return -ENOENT; | |
e86924a8 | 1080 | |
2ad3d716 AE |
1081 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1082 | } else { | |
1083 | u64 size = 0; | |
1084 | int ret; | |
1085 | ||
1086 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1087 | if (ret) | |
1088 | return ret; | |
1089 | ||
1090 | *snap_size = size; | |
1091 | } | |
1092 | return 0; | |
602adf40 YS |
1093 | } |
1094 | ||
2ad3d716 AE |
1095 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1096 | u64 *snap_features) | |
602adf40 | 1097 | { |
2ad3d716 AE |
1098 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1099 | if (snap_id == CEPH_NOSNAP) { | |
1100 | *snap_features = rbd_dev->header.features; | |
1101 | } else if (rbd_dev->image_format == 1) { | |
1102 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1103 | } else { |
2ad3d716 AE |
1104 | u64 features = 0; |
1105 | int ret; | |
8b0241f8 | 1106 | |
2ad3d716 AE |
1107 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1108 | if (ret) | |
1109 | return ret; | |
1110 | ||
1111 | *snap_features = features; | |
1112 | } | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1117 | { | |
8f4b7d98 | 1118 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1119 | u64 size = 0; |
1120 | u64 features = 0; | |
1121 | int ret; | |
1122 | ||
2ad3d716 AE |
1123 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1124 | if (ret) | |
1125 | return ret; | |
1126 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1127 | if (ret) | |
1128 | return ret; | |
1129 | ||
1130 | rbd_dev->mapping.size = size; | |
1131 | rbd_dev->mapping.features = features; | |
1132 | ||
8b0241f8 | 1133 | return 0; |
602adf40 YS |
1134 | } |
1135 | ||
d1cf5788 AE |
1136 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1137 | { | |
1138 | rbd_dev->mapping.size = 0; | |
1139 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1140 | } |
1141 | ||
98571b5a | 1142 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 1143 | { |
65ccfe21 AE |
1144 | char *name; |
1145 | u64 segment; | |
1146 | int ret; | |
3a96d5cd | 1147 | char *name_format; |
602adf40 | 1148 | |
78c2a44a | 1149 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
1150 | if (!name) |
1151 | return NULL; | |
1152 | segment = offset >> rbd_dev->header.obj_order; | |
3a96d5cd JD |
1153 | name_format = "%s.%012llx"; |
1154 | if (rbd_dev->image_format == 2) | |
1155 | name_format = "%s.%016llx"; | |
2d0ebc5d | 1156 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
65ccfe21 | 1157 | rbd_dev->header.object_prefix, segment); |
2d0ebc5d | 1158 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
65ccfe21 AE |
1159 | pr_err("error formatting segment name for #%llu (%d)\n", |
1160 | segment, ret); | |
1161 | kfree(name); | |
1162 | name = NULL; | |
1163 | } | |
602adf40 | 1164 | |
65ccfe21 AE |
1165 | return name; |
1166 | } | |
602adf40 | 1167 | |
78c2a44a AE |
1168 | static void rbd_segment_name_free(const char *name) |
1169 | { | |
1170 | /* The explicit cast here is needed to drop the const qualifier */ | |
1171 | ||
1172 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
1173 | } | |
1174 | ||
65ccfe21 AE |
1175 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1176 | { | |
1177 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 1178 | |
65ccfe21 AE |
1179 | return offset & (segment_size - 1); |
1180 | } | |
1181 | ||
1182 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1183 | u64 offset, u64 length) | |
1184 | { | |
1185 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1186 | ||
1187 | offset &= segment_size - 1; | |
1188 | ||
aafb230e | 1189 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1190 | if (offset + length > segment_size) |
1191 | length = segment_size - offset; | |
1192 | ||
1193 | return length; | |
602adf40 YS |
1194 | } |
1195 | ||
029bcbd8 JD |
1196 | /* |
1197 | * returns the size of an object in the image | |
1198 | */ | |
1199 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1200 | { | |
1201 | return 1 << header->obj_order; | |
1202 | } | |
1203 | ||
602adf40 YS |
1204 | /* |
1205 | * bio helpers | |
1206 | */ | |
1207 | ||
1208 | static void bio_chain_put(struct bio *chain) | |
1209 | { | |
1210 | struct bio *tmp; | |
1211 | ||
1212 | while (chain) { | |
1213 | tmp = chain; | |
1214 | chain = chain->bi_next; | |
1215 | bio_put(tmp); | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * zeros a bio chain, starting at specific offset | |
1221 | */ | |
1222 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1223 | { | |
7988613b KO |
1224 | struct bio_vec bv; |
1225 | struct bvec_iter iter; | |
602adf40 YS |
1226 | unsigned long flags; |
1227 | void *buf; | |
602adf40 YS |
1228 | int pos = 0; |
1229 | ||
1230 | while (chain) { | |
7988613b KO |
1231 | bio_for_each_segment(bv, chain, iter) { |
1232 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1233 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1234 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1235 | memset(buf + remainder, 0, |
7988613b KO |
1236 | bv.bv_len - remainder); |
1237 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1238 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1239 | } |
7988613b | 1240 | pos += bv.bv_len; |
602adf40 YS |
1241 | } |
1242 | ||
1243 | chain = chain->bi_next; | |
1244 | } | |
1245 | } | |
1246 | ||
b9434c5b AE |
1247 | /* |
1248 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1249 | * starting at the given byte offset from the start of the array and | |
1250 | * continuing up to the given end offset. The pages array is | |
1251 | * assumed to be big enough to hold all bytes up to the end. | |
1252 | */ | |
1253 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1254 | { | |
1255 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1256 | ||
1257 | rbd_assert(end > offset); | |
1258 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1259 | while (offset < end) { | |
1260 | size_t page_offset; | |
1261 | size_t length; | |
1262 | unsigned long flags; | |
1263 | void *kaddr; | |
1264 | ||
491205a8 GU |
1265 | page_offset = offset & ~PAGE_MASK; |
1266 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1267 | local_irq_save(flags); |
1268 | kaddr = kmap_atomic(*page); | |
1269 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1270 | flush_dcache_page(*page); |
b9434c5b AE |
1271 | kunmap_atomic(kaddr); |
1272 | local_irq_restore(flags); | |
1273 | ||
1274 | offset += length; | |
1275 | page++; | |
1276 | } | |
1277 | } | |
1278 | ||
602adf40 | 1279 | /* |
f7760dad AE |
1280 | * Clone a portion of a bio, starting at the given byte offset |
1281 | * and continuing for the number of bytes indicated. | |
602adf40 | 1282 | */ |
f7760dad AE |
1283 | static struct bio *bio_clone_range(struct bio *bio_src, |
1284 | unsigned int offset, | |
1285 | unsigned int len, | |
1286 | gfp_t gfpmask) | |
602adf40 | 1287 | { |
f7760dad AE |
1288 | struct bio *bio; |
1289 | ||
5341a627 | 1290 | bio = bio_clone(bio_src, gfpmask); |
f7760dad AE |
1291 | if (!bio) |
1292 | return NULL; /* ENOMEM */ | |
602adf40 | 1293 | |
5341a627 | 1294 | bio_advance(bio, offset); |
4f024f37 | 1295 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1296 | |
1297 | return bio; | |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * Clone a portion of a bio chain, starting at the given byte offset | |
1302 | * into the first bio in the source chain and continuing for the | |
1303 | * number of bytes indicated. The result is another bio chain of | |
1304 | * exactly the given length, or a null pointer on error. | |
1305 | * | |
1306 | * The bio_src and offset parameters are both in-out. On entry they | |
1307 | * refer to the first source bio and the offset into that bio where | |
1308 | * the start of data to be cloned is located. | |
1309 | * | |
1310 | * On return, bio_src is updated to refer to the bio in the source | |
1311 | * chain that contains first un-cloned byte, and *offset will | |
1312 | * contain the offset of that byte within that bio. | |
1313 | */ | |
1314 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1315 | unsigned int *offset, | |
1316 | unsigned int len, | |
1317 | gfp_t gfpmask) | |
1318 | { | |
1319 | struct bio *bi = *bio_src; | |
1320 | unsigned int off = *offset; | |
1321 | struct bio *chain = NULL; | |
1322 | struct bio **end; | |
1323 | ||
1324 | /* Build up a chain of clone bios up to the limit */ | |
1325 | ||
4f024f37 | 1326 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1327 | return NULL; /* Nothing to clone */ |
602adf40 | 1328 | |
f7760dad AE |
1329 | end = &chain; |
1330 | while (len) { | |
1331 | unsigned int bi_size; | |
1332 | struct bio *bio; | |
1333 | ||
f5400b7a AE |
1334 | if (!bi) { |
1335 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1336 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1337 | } |
4f024f37 | 1338 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1339 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1340 | if (!bio) | |
1341 | goto out_err; /* ENOMEM */ | |
1342 | ||
1343 | *end = bio; | |
1344 | end = &bio->bi_next; | |
602adf40 | 1345 | |
f7760dad | 1346 | off += bi_size; |
4f024f37 | 1347 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1348 | bi = bi->bi_next; |
1349 | off = 0; | |
1350 | } | |
1351 | len -= bi_size; | |
1352 | } | |
1353 | *bio_src = bi; | |
1354 | *offset = off; | |
1355 | ||
1356 | return chain; | |
1357 | out_err: | |
1358 | bio_chain_put(chain); | |
602adf40 | 1359 | |
602adf40 YS |
1360 | return NULL; |
1361 | } | |
1362 | ||
926f9b3f AE |
1363 | /* |
1364 | * The default/initial value for all object request flags is 0. For | |
1365 | * each flag, once its value is set to 1 it is never reset to 0 | |
1366 | * again. | |
1367 | */ | |
57acbaa7 | 1368 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1369 | { |
57acbaa7 | 1370 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1371 | struct rbd_device *rbd_dev; |
1372 | ||
57acbaa7 AE |
1373 | rbd_dev = obj_request->img_request->rbd_dev; |
1374 | rbd_warn(rbd_dev, "obj_request %p already marked img_data\n", | |
926f9b3f AE |
1375 | obj_request); |
1376 | } | |
1377 | } | |
1378 | ||
57acbaa7 | 1379 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1380 | { |
1381 | smp_mb(); | |
57acbaa7 | 1382 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1383 | } |
1384 | ||
57acbaa7 | 1385 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1386 | { |
57acbaa7 AE |
1387 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1388 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1389 | |
57acbaa7 AE |
1390 | if (obj_request_img_data_test(obj_request)) |
1391 | rbd_dev = obj_request->img_request->rbd_dev; | |
1392 | rbd_warn(rbd_dev, "obj_request %p already marked done\n", | |
6365d33a AE |
1393 | obj_request); |
1394 | } | |
1395 | } | |
1396 | ||
57acbaa7 | 1397 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1398 | { |
1399 | smp_mb(); | |
57acbaa7 | 1400 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1401 | } |
1402 | ||
5679c59f AE |
1403 | /* |
1404 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1405 | * flag. The latter is set based on the "exists" value provided. | |
1406 | * | |
1407 | * Note that for our purposes once an object exists it never goes | |
1408 | * away again. It's possible that the response from two existence | |
1409 | * checks are separated by the creation of the target object, and | |
1410 | * the first ("doesn't exist") response arrives *after* the second | |
1411 | * ("does exist"). In that case we ignore the second one. | |
1412 | */ | |
1413 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1414 | bool exists) | |
1415 | { | |
1416 | if (exists) | |
1417 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1418 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1419 | smp_mb(); | |
1420 | } | |
1421 | ||
1422 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1423 | { | |
1424 | smp_mb(); | |
1425 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1426 | } | |
1427 | ||
1428 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1429 | { | |
1430 | smp_mb(); | |
1431 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1432 | } | |
1433 | ||
9638556a ID |
1434 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1435 | { | |
1436 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1437 | ||
1438 | return obj_request->img_offset < | |
1439 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1440 | } | |
1441 | ||
bf0d5f50 AE |
1442 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1443 | { | |
37206ee5 AE |
1444 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1445 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1446 | kref_get(&obj_request->kref); |
1447 | } | |
1448 | ||
1449 | static void rbd_obj_request_destroy(struct kref *kref); | |
1450 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1451 | { | |
1452 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1453 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1454 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1455 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1456 | } | |
1457 | ||
0f2d5be7 AE |
1458 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1459 | { | |
1460 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
1461 | atomic_read(&img_request->kref.refcount)); | |
1462 | kref_get(&img_request->kref); | |
1463 | } | |
1464 | ||
e93f3152 AE |
1465 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1466 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1467 | static void rbd_img_request_destroy(struct kref *kref); |
1468 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1469 | { | |
1470 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1471 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1472 | atomic_read(&img_request->kref.refcount)); | |
e93f3152 AE |
1473 | if (img_request_child_test(img_request)) |
1474 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1475 | else | |
1476 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1477 | } |
1478 | ||
1479 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1480 | struct rbd_obj_request *obj_request) | |
1481 | { | |
25dcf954 AE |
1482 | rbd_assert(obj_request->img_request == NULL); |
1483 | ||
b155e86c | 1484 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1485 | obj_request->img_request = img_request; |
25dcf954 | 1486 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1487 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1488 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1489 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1490 | img_request->obj_request_count++; |
1491 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1492 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1493 | obj_request->which); | |
bf0d5f50 AE |
1494 | } |
1495 | ||
1496 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1497 | struct rbd_obj_request *obj_request) | |
1498 | { | |
1499 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1500 | |
37206ee5 AE |
1501 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1502 | obj_request->which); | |
bf0d5f50 | 1503 | list_del(&obj_request->links); |
25dcf954 AE |
1504 | rbd_assert(img_request->obj_request_count > 0); |
1505 | img_request->obj_request_count--; | |
1506 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1507 | obj_request->which = BAD_WHICH; | |
6365d33a | 1508 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1509 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1510 | obj_request->img_request = NULL; |
25dcf954 | 1511 | obj_request->callback = NULL; |
bf0d5f50 AE |
1512 | rbd_obj_request_put(obj_request); |
1513 | } | |
1514 | ||
1515 | static bool obj_request_type_valid(enum obj_request_type type) | |
1516 | { | |
1517 | switch (type) { | |
9969ebc5 | 1518 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1519 | case OBJ_REQUEST_BIO: |
788e2df3 | 1520 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1521 | return true; |
1522 | default: | |
1523 | return false; | |
1524 | } | |
1525 | } | |
1526 | ||
bf0d5f50 AE |
1527 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1528 | struct rbd_obj_request *obj_request) | |
1529 | { | |
71c20a06 | 1530 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1531 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1532 | } | |
1533 | ||
71c20a06 ID |
1534 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
1535 | { | |
1536 | dout("%s %p\n", __func__, obj_request); | |
1537 | ceph_osdc_cancel_request(obj_request->osd_req); | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * Wait for an object request to complete. If interrupted, cancel the | |
1542 | * underlying osd request. | |
1543 | */ | |
1544 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1545 | { | |
1546 | int ret; | |
1547 | ||
1548 | dout("%s %p\n", __func__, obj_request); | |
1549 | ||
1550 | ret = wait_for_completion_interruptible(&obj_request->completion); | |
1551 | if (ret < 0) { | |
1552 | dout("%s %p interrupted\n", __func__, obj_request); | |
1553 | rbd_obj_request_end(obj_request); | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | dout("%s %p done\n", __func__, obj_request); | |
1558 | return 0; | |
1559 | } | |
1560 | ||
bf0d5f50 AE |
1561 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1562 | { | |
55f27e09 | 1563 | |
37206ee5 | 1564 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1565 | |
1566 | /* | |
1567 | * If no error occurred, compute the aggregate transfer | |
1568 | * count for the image request. We could instead use | |
1569 | * atomic64_cmpxchg() to update it as each object request | |
1570 | * completes; not clear which way is better off hand. | |
1571 | */ | |
1572 | if (!img_request->result) { | |
1573 | struct rbd_obj_request *obj_request; | |
1574 | u64 xferred = 0; | |
1575 | ||
1576 | for_each_obj_request(img_request, obj_request) | |
1577 | xferred += obj_request->xferred; | |
1578 | img_request->xferred = xferred; | |
1579 | } | |
1580 | ||
bf0d5f50 AE |
1581 | if (img_request->callback) |
1582 | img_request->callback(img_request); | |
1583 | else | |
1584 | rbd_img_request_put(img_request); | |
1585 | } | |
1586 | ||
0c425248 AE |
1587 | /* |
1588 | * The default/initial value for all image request flags is 0. Each | |
1589 | * is conditionally set to 1 at image request initialization time | |
1590 | * and currently never change thereafter. | |
1591 | */ | |
1592 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1593 | { | |
1594 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1595 | smp_mb(); | |
1596 | } | |
1597 | ||
1598 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1599 | { | |
1600 | smp_mb(); | |
1601 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1602 | } | |
1603 | ||
9849e986 AE |
1604 | static void img_request_child_set(struct rbd_img_request *img_request) |
1605 | { | |
1606 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1607 | smp_mb(); | |
1608 | } | |
1609 | ||
e93f3152 AE |
1610 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1611 | { | |
1612 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1613 | smp_mb(); | |
1614 | } | |
1615 | ||
9849e986 AE |
1616 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1617 | { | |
1618 | smp_mb(); | |
1619 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1620 | } | |
1621 | ||
d0b2e944 AE |
1622 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1623 | { | |
1624 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1625 | smp_mb(); | |
1626 | } | |
1627 | ||
a2acd00e AE |
1628 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1629 | { | |
1630 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1631 | smp_mb(); | |
1632 | } | |
1633 | ||
d0b2e944 AE |
1634 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1635 | { | |
1636 | smp_mb(); | |
1637 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1638 | } | |
1639 | ||
6e2a4505 AE |
1640 | static void |
1641 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1642 | { | |
b9434c5b AE |
1643 | u64 xferred = obj_request->xferred; |
1644 | u64 length = obj_request->length; | |
1645 | ||
6e2a4505 AE |
1646 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1647 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1648 | xferred, length); |
6e2a4505 | 1649 | /* |
17c1cc1d JD |
1650 | * ENOENT means a hole in the image. We zero-fill the entire |
1651 | * length of the request. A short read also implies zero-fill | |
1652 | * to the end of the request. An error requires the whole | |
1653 | * length of the request to be reported finished with an error | |
1654 | * to the block layer. In each case we update the xferred | |
1655 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1656 | */ |
b9434c5b | 1657 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1658 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1659 | if (obj_request->type == OBJ_REQUEST_BIO) |
1660 | zero_bio_chain(obj_request->bio_list, 0); | |
1661 | else | |
1662 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1663 | obj_request->result = 0; |
b9434c5b AE |
1664 | } else if (xferred < length && !obj_request->result) { |
1665 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1666 | zero_bio_chain(obj_request->bio_list, xferred); | |
1667 | else | |
1668 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1669 | } |
17c1cc1d | 1670 | obj_request->xferred = length; |
6e2a4505 AE |
1671 | obj_request_done_set(obj_request); |
1672 | } | |
1673 | ||
bf0d5f50 AE |
1674 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1675 | { | |
37206ee5 AE |
1676 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1677 | obj_request->callback); | |
bf0d5f50 AE |
1678 | if (obj_request->callback) |
1679 | obj_request->callback(obj_request); | |
788e2df3 AE |
1680 | else |
1681 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1682 | } |
1683 | ||
c47f9371 | 1684 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1685 | { |
1686 | dout("%s: obj %p\n", __func__, obj_request); | |
1687 | obj_request_done_set(obj_request); | |
1688 | } | |
1689 | ||
c47f9371 | 1690 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1691 | { |
57acbaa7 | 1692 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1693 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1694 | bool layered = false; |
1695 | ||
1696 | if (obj_request_img_data_test(obj_request)) { | |
1697 | img_request = obj_request->img_request; | |
1698 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1699 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1700 | } |
8b3e1a56 AE |
1701 | |
1702 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1703 | obj_request, img_request, obj_request->result, | |
1704 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1705 | if (layered && obj_request->result == -ENOENT && |
1706 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1707 | rbd_img_parent_read(obj_request); |
1708 | else if (img_request) | |
6e2a4505 AE |
1709 | rbd_img_obj_request_read_callback(obj_request); |
1710 | else | |
1711 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1712 | } |
1713 | ||
c47f9371 | 1714 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1715 | { |
1b83bef2 SW |
1716 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1717 | obj_request->result, obj_request->length); | |
1718 | /* | |
8b3e1a56 AE |
1719 | * There is no such thing as a successful short write. Set |
1720 | * it to our originally-requested length. | |
1b83bef2 SW |
1721 | */ |
1722 | obj_request->xferred = obj_request->length; | |
07741308 | 1723 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1724 | } |
1725 | ||
fbfab539 AE |
1726 | /* |
1727 | * For a simple stat call there's nothing to do. We'll do more if | |
1728 | * this is part of a write sequence for a layered image. | |
1729 | */ | |
c47f9371 | 1730 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1731 | { |
37206ee5 | 1732 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1733 | obj_request_done_set(obj_request); |
1734 | } | |
1735 | ||
bf0d5f50 AE |
1736 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1737 | struct ceph_msg *msg) | |
1738 | { | |
1739 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1740 | u16 opcode; |
1741 | ||
37206ee5 | 1742 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1743 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1744 | if (obj_request_img_data_test(obj_request)) { |
1745 | rbd_assert(obj_request->img_request); | |
1746 | rbd_assert(obj_request->which != BAD_WHICH); | |
1747 | } else { | |
1748 | rbd_assert(obj_request->which == BAD_WHICH); | |
1749 | } | |
bf0d5f50 | 1750 | |
1b83bef2 SW |
1751 | if (osd_req->r_result < 0) |
1752 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1753 | |
7cc69d42 | 1754 | rbd_assert(osd_req->r_num_ops <= CEPH_OSD_MAX_OP); |
bf0d5f50 | 1755 | |
c47f9371 AE |
1756 | /* |
1757 | * We support a 64-bit length, but ultimately it has to be | |
1758 | * passed to blk_end_request(), which takes an unsigned int. | |
1759 | */ | |
1b83bef2 | 1760 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1761 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1762 | |
79528734 | 1763 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1764 | switch (opcode) { |
1765 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1766 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1767 | break; |
0ccd5926 ID |
1768 | case CEPH_OSD_OP_SETALLOCHINT: |
1769 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE); | |
1770 | /* fall through */ | |
bf0d5f50 | 1771 | case CEPH_OSD_OP_WRITE: |
c47f9371 | 1772 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1773 | break; |
fbfab539 | 1774 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1775 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1776 | break; |
36be9a76 | 1777 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1778 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1779 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1780 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1781 | break; |
bf0d5f50 AE |
1782 | default: |
1783 | rbd_warn(NULL, "%s: unsupported op %hu\n", | |
1784 | obj_request->object_name, (unsigned short) opcode); | |
1785 | break; | |
1786 | } | |
1787 | ||
07741308 | 1788 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1789 | rbd_obj_request_complete(obj_request); |
1790 | } | |
1791 | ||
9d4df01f | 1792 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1793 | { |
1794 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1795 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1796 | u64 snap_id; |
430c28c3 | 1797 | |
8c042b0d | 1798 | rbd_assert(osd_req != NULL); |
430c28c3 | 1799 | |
9d4df01f | 1800 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1801 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1802 | NULL, snap_id, NULL); |
1803 | } | |
1804 | ||
1805 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1806 | { | |
1807 | struct rbd_img_request *img_request = obj_request->img_request; | |
1808 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1809 | struct ceph_snap_context *snapc; | |
1810 | struct timespec mtime = CURRENT_TIME; | |
1811 | ||
1812 | rbd_assert(osd_req != NULL); | |
1813 | ||
1814 | snapc = img_request ? img_request->snapc : NULL; | |
1815 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1816 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1817 | } |
1818 | ||
0ccd5926 ID |
1819 | /* |
1820 | * Create an osd request. A read request has one osd op (read). | |
1821 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1822 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1823 | * technically osd watch is a write request, hence this distinction.) | |
1824 | */ | |
bf0d5f50 AE |
1825 | static struct ceph_osd_request *rbd_osd_req_create( |
1826 | struct rbd_device *rbd_dev, | |
1827 | bool write_request, | |
deb236b3 | 1828 | unsigned int num_ops, |
430c28c3 | 1829 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1830 | { |
bf0d5f50 AE |
1831 | struct ceph_snap_context *snapc = NULL; |
1832 | struct ceph_osd_client *osdc; | |
1833 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1834 | |
6365d33a AE |
1835 | if (obj_request_img_data_test(obj_request)) { |
1836 | struct rbd_img_request *img_request = obj_request->img_request; | |
1837 | ||
0c425248 AE |
1838 | rbd_assert(write_request == |
1839 | img_request_write_test(img_request)); | |
1840 | if (write_request) | |
bf0d5f50 | 1841 | snapc = img_request->snapc; |
bf0d5f50 AE |
1842 | } |
1843 | ||
0ccd5926 | 1844 | rbd_assert(num_ops == 1 || (write_request && num_ops == 2)); |
deb236b3 ID |
1845 | |
1846 | /* Allocate and initialize the request, for the num_ops ops */ | |
bf0d5f50 AE |
1847 | |
1848 | osdc = &rbd_dev->rbd_client->client->osdc; | |
deb236b3 ID |
1849 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
1850 | GFP_ATOMIC); | |
bf0d5f50 AE |
1851 | if (!osd_req) |
1852 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1853 | |
430c28c3 | 1854 | if (write_request) |
bf0d5f50 | 1855 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1856 | else |
bf0d5f50 | 1857 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1858 | |
1859 | osd_req->r_callback = rbd_osd_req_callback; | |
1860 | osd_req->r_priv = obj_request; | |
1861 | ||
3c972c95 ID |
1862 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1863 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
bf0d5f50 | 1864 | |
bf0d5f50 AE |
1865 | return osd_req; |
1866 | } | |
1867 | ||
0eefd470 AE |
1868 | /* |
1869 | * Create a copyup osd request based on the information in the | |
0ccd5926 ID |
1870 | * object request supplied. A copyup request has three osd ops, |
1871 | * a copyup method call, a hint op, and a write op. | |
0eefd470 AE |
1872 | */ |
1873 | static struct ceph_osd_request * | |
1874 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1875 | { | |
1876 | struct rbd_img_request *img_request; | |
1877 | struct ceph_snap_context *snapc; | |
1878 | struct rbd_device *rbd_dev; | |
1879 | struct ceph_osd_client *osdc; | |
1880 | struct ceph_osd_request *osd_req; | |
1881 | ||
1882 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1883 | img_request = obj_request->img_request; | |
1884 | rbd_assert(img_request); | |
1885 | rbd_assert(img_request_write_test(img_request)); | |
1886 | ||
0ccd5926 | 1887 | /* Allocate and initialize the request, for the three ops */ |
0eefd470 AE |
1888 | |
1889 | snapc = img_request->snapc; | |
1890 | rbd_dev = img_request->rbd_dev; | |
1891 | osdc = &rbd_dev->rbd_client->client->osdc; | |
0ccd5926 | 1892 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 3, false, GFP_ATOMIC); |
0eefd470 AE |
1893 | if (!osd_req) |
1894 | return NULL; /* ENOMEM */ | |
1895 | ||
1896 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1897 | osd_req->r_callback = rbd_osd_req_callback; | |
1898 | osd_req->r_priv = obj_request; | |
1899 | ||
3c972c95 ID |
1900 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1901 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
0eefd470 | 1902 | |
0eefd470 AE |
1903 | return osd_req; |
1904 | } | |
1905 | ||
1906 | ||
bf0d5f50 AE |
1907 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1908 | { | |
1909 | ceph_osdc_put_request(osd_req); | |
1910 | } | |
1911 | ||
1912 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1913 | ||
1914 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1915 | u64 offset, u64 length, | |
1916 | enum obj_request_type type) | |
1917 | { | |
1918 | struct rbd_obj_request *obj_request; | |
1919 | size_t size; | |
1920 | char *name; | |
1921 | ||
1922 | rbd_assert(obj_request_type_valid(type)); | |
1923 | ||
1924 | size = strlen(object_name) + 1; | |
f907ad55 AE |
1925 | name = kmalloc(size, GFP_KERNEL); |
1926 | if (!name) | |
bf0d5f50 AE |
1927 | return NULL; |
1928 | ||
868311b1 | 1929 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL); |
f907ad55 AE |
1930 | if (!obj_request) { |
1931 | kfree(name); | |
1932 | return NULL; | |
1933 | } | |
1934 | ||
bf0d5f50 AE |
1935 | obj_request->object_name = memcpy(name, object_name, size); |
1936 | obj_request->offset = offset; | |
1937 | obj_request->length = length; | |
926f9b3f | 1938 | obj_request->flags = 0; |
bf0d5f50 AE |
1939 | obj_request->which = BAD_WHICH; |
1940 | obj_request->type = type; | |
1941 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1942 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1943 | kref_init(&obj_request->kref); |
1944 | ||
37206ee5 AE |
1945 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1946 | offset, length, (int)type, obj_request); | |
1947 | ||
bf0d5f50 AE |
1948 | return obj_request; |
1949 | } | |
1950 | ||
1951 | static void rbd_obj_request_destroy(struct kref *kref) | |
1952 | { | |
1953 | struct rbd_obj_request *obj_request; | |
1954 | ||
1955 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1956 | ||
37206ee5 AE |
1957 | dout("%s: obj %p\n", __func__, obj_request); |
1958 | ||
bf0d5f50 AE |
1959 | rbd_assert(obj_request->img_request == NULL); |
1960 | rbd_assert(obj_request->which == BAD_WHICH); | |
1961 | ||
1962 | if (obj_request->osd_req) | |
1963 | rbd_osd_req_destroy(obj_request->osd_req); | |
1964 | ||
1965 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1966 | switch (obj_request->type) { | |
9969ebc5 AE |
1967 | case OBJ_REQUEST_NODATA: |
1968 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1969 | case OBJ_REQUEST_BIO: |
1970 | if (obj_request->bio_list) | |
1971 | bio_chain_put(obj_request->bio_list); | |
1972 | break; | |
788e2df3 AE |
1973 | case OBJ_REQUEST_PAGES: |
1974 | if (obj_request->pages) | |
1975 | ceph_release_page_vector(obj_request->pages, | |
1976 | obj_request->page_count); | |
1977 | break; | |
bf0d5f50 AE |
1978 | } |
1979 | ||
f907ad55 | 1980 | kfree(obj_request->object_name); |
868311b1 AE |
1981 | obj_request->object_name = NULL; |
1982 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
1983 | } |
1984 | ||
fb65d228 AE |
1985 | /* It's OK to call this for a device with no parent */ |
1986 | ||
1987 | static void rbd_spec_put(struct rbd_spec *spec); | |
1988 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1989 | { | |
1990 | rbd_dev_remove_parent(rbd_dev); | |
1991 | rbd_spec_put(rbd_dev->parent_spec); | |
1992 | rbd_dev->parent_spec = NULL; | |
1993 | rbd_dev->parent_overlap = 0; | |
1994 | } | |
1995 | ||
a2acd00e AE |
1996 | /* |
1997 | * Parent image reference counting is used to determine when an | |
1998 | * image's parent fields can be safely torn down--after there are no | |
1999 | * more in-flight requests to the parent image. When the last | |
2000 | * reference is dropped, cleaning them up is safe. | |
2001 | */ | |
2002 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2003 | { | |
2004 | int counter; | |
2005 | ||
2006 | if (!rbd_dev->parent_spec) | |
2007 | return; | |
2008 | ||
2009 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2010 | if (counter > 0) | |
2011 | return; | |
2012 | ||
2013 | /* Last reference; clean up parent data structures */ | |
2014 | ||
2015 | if (!counter) | |
2016 | rbd_dev_unparent(rbd_dev); | |
2017 | else | |
2018 | rbd_warn(rbd_dev, "parent reference underflow\n"); | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * If an image has a non-zero parent overlap, get a reference to its | |
2023 | * parent. | |
2024 | * | |
392a9dad AE |
2025 | * We must get the reference before checking for the overlap to |
2026 | * coordinate properly with zeroing the parent overlap in | |
2027 | * rbd_dev_v2_parent_info() when an image gets flattened. We | |
2028 | * drop it again if there is no overlap. | |
2029 | * | |
a2acd00e AE |
2030 | * Returns true if the rbd device has a parent with a non-zero |
2031 | * overlap and a reference for it was successfully taken, or | |
2032 | * false otherwise. | |
2033 | */ | |
2034 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2035 | { | |
2036 | int counter; | |
2037 | ||
2038 | if (!rbd_dev->parent_spec) | |
2039 | return false; | |
2040 | ||
2041 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2042 | if (counter > 0 && rbd_dev->parent_overlap) | |
2043 | return true; | |
2044 | ||
2045 | /* Image was flattened, but parent is not yet torn down */ | |
2046 | ||
2047 | if (counter < 0) | |
2048 | rbd_warn(rbd_dev, "parent reference overflow\n"); | |
2049 | ||
2050 | return false; | |
2051 | } | |
2052 | ||
bf0d5f50 AE |
2053 | /* |
2054 | * Caller is responsible for filling in the list of object requests | |
2055 | * that comprises the image request, and the Linux request pointer | |
2056 | * (if there is one). | |
2057 | */ | |
cc344fa1 AE |
2058 | static struct rbd_img_request *rbd_img_request_create( |
2059 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2060 | u64 offset, u64 length, |
e93f3152 | 2061 | bool write_request) |
bf0d5f50 AE |
2062 | { |
2063 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2064 | |
1c2a9dfe | 2065 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_ATOMIC); |
bf0d5f50 AE |
2066 | if (!img_request) |
2067 | return NULL; | |
2068 | ||
2069 | if (write_request) { | |
2070 | down_read(&rbd_dev->header_rwsem); | |
812164f8 | 2071 | ceph_get_snap_context(rbd_dev->header.snapc); |
bf0d5f50 | 2072 | up_read(&rbd_dev->header_rwsem); |
bf0d5f50 AE |
2073 | } |
2074 | ||
2075 | img_request->rq = NULL; | |
2076 | img_request->rbd_dev = rbd_dev; | |
2077 | img_request->offset = offset; | |
2078 | img_request->length = length; | |
0c425248 AE |
2079 | img_request->flags = 0; |
2080 | if (write_request) { | |
2081 | img_request_write_set(img_request); | |
468521c1 | 2082 | img_request->snapc = rbd_dev->header.snapc; |
0c425248 | 2083 | } else { |
bf0d5f50 | 2084 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2085 | } |
a2acd00e | 2086 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2087 | img_request_layered_set(img_request); |
bf0d5f50 AE |
2088 | spin_lock_init(&img_request->completion_lock); |
2089 | img_request->next_completion = 0; | |
2090 | img_request->callback = NULL; | |
a5a337d4 | 2091 | img_request->result = 0; |
bf0d5f50 AE |
2092 | img_request->obj_request_count = 0; |
2093 | INIT_LIST_HEAD(&img_request->obj_requests); | |
2094 | kref_init(&img_request->kref); | |
2095 | ||
37206ee5 AE |
2096 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
2097 | write_request ? "write" : "read", offset, length, | |
2098 | img_request); | |
2099 | ||
bf0d5f50 AE |
2100 | return img_request; |
2101 | } | |
2102 | ||
2103 | static void rbd_img_request_destroy(struct kref *kref) | |
2104 | { | |
2105 | struct rbd_img_request *img_request; | |
2106 | struct rbd_obj_request *obj_request; | |
2107 | struct rbd_obj_request *next_obj_request; | |
2108 | ||
2109 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2110 | ||
37206ee5 AE |
2111 | dout("%s: img %p\n", __func__, img_request); |
2112 | ||
bf0d5f50 AE |
2113 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2114 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2115 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2116 | |
a2acd00e AE |
2117 | if (img_request_layered_test(img_request)) { |
2118 | img_request_layered_clear(img_request); | |
2119 | rbd_dev_parent_put(img_request->rbd_dev); | |
2120 | } | |
2121 | ||
0c425248 | 2122 | if (img_request_write_test(img_request)) |
812164f8 | 2123 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2124 | |
1c2a9dfe | 2125 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2126 | } |
2127 | ||
e93f3152 AE |
2128 | static struct rbd_img_request *rbd_parent_request_create( |
2129 | struct rbd_obj_request *obj_request, | |
2130 | u64 img_offset, u64 length) | |
2131 | { | |
2132 | struct rbd_img_request *parent_request; | |
2133 | struct rbd_device *rbd_dev; | |
2134 | ||
2135 | rbd_assert(obj_request->img_request); | |
2136 | rbd_dev = obj_request->img_request->rbd_dev; | |
2137 | ||
2138 | parent_request = rbd_img_request_create(rbd_dev->parent, | |
2139 | img_offset, length, false); | |
2140 | if (!parent_request) | |
2141 | return NULL; | |
2142 | ||
2143 | img_request_child_set(parent_request); | |
2144 | rbd_obj_request_get(obj_request); | |
2145 | parent_request->obj_request = obj_request; | |
2146 | ||
2147 | return parent_request; | |
2148 | } | |
2149 | ||
2150 | static void rbd_parent_request_destroy(struct kref *kref) | |
2151 | { | |
2152 | struct rbd_img_request *parent_request; | |
2153 | struct rbd_obj_request *orig_request; | |
2154 | ||
2155 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2156 | orig_request = parent_request->obj_request; | |
2157 | ||
2158 | parent_request->obj_request = NULL; | |
2159 | rbd_obj_request_put(orig_request); | |
2160 | img_request_child_clear(parent_request); | |
2161 | ||
2162 | rbd_img_request_destroy(kref); | |
2163 | } | |
2164 | ||
1217857f AE |
2165 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2166 | { | |
6365d33a | 2167 | struct rbd_img_request *img_request; |
1217857f AE |
2168 | unsigned int xferred; |
2169 | int result; | |
8b3e1a56 | 2170 | bool more; |
1217857f | 2171 | |
6365d33a AE |
2172 | rbd_assert(obj_request_img_data_test(obj_request)); |
2173 | img_request = obj_request->img_request; | |
2174 | ||
1217857f AE |
2175 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2176 | xferred = (unsigned int)obj_request->xferred; | |
2177 | result = obj_request->result; | |
2178 | if (result) { | |
2179 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2180 | ||
2181 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n", | |
2182 | img_request_write_test(img_request) ? "write" : "read", | |
2183 | obj_request->length, obj_request->img_offset, | |
2184 | obj_request->offset); | |
2185 | rbd_warn(rbd_dev, " result %d xferred %x\n", | |
2186 | result, xferred); | |
2187 | if (!img_request->result) | |
2188 | img_request->result = result; | |
2189 | } | |
2190 | ||
f1a4739f AE |
2191 | /* Image object requests don't own their page array */ |
2192 | ||
2193 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
2194 | obj_request->pages = NULL; | |
2195 | obj_request->page_count = 0; | |
2196 | } | |
2197 | ||
8b3e1a56 AE |
2198 | if (img_request_child_test(img_request)) { |
2199 | rbd_assert(img_request->obj_request != NULL); | |
2200 | more = obj_request->which < img_request->obj_request_count - 1; | |
2201 | } else { | |
2202 | rbd_assert(img_request->rq != NULL); | |
2203 | more = blk_end_request(img_request->rq, result, xferred); | |
2204 | } | |
2205 | ||
2206 | return more; | |
1217857f AE |
2207 | } |
2208 | ||
2169238d AE |
2209 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2210 | { | |
2211 | struct rbd_img_request *img_request; | |
2212 | u32 which = obj_request->which; | |
2213 | bool more = true; | |
2214 | ||
6365d33a | 2215 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2216 | img_request = obj_request->img_request; |
2217 | ||
2218 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2219 | rbd_assert(img_request != NULL); | |
2169238d AE |
2220 | rbd_assert(img_request->obj_request_count > 0); |
2221 | rbd_assert(which != BAD_WHICH); | |
2222 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2223 | |
2224 | spin_lock_irq(&img_request->completion_lock); | |
2225 | if (which != img_request->next_completion) | |
2226 | goto out; | |
2227 | ||
2228 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2229 | rbd_assert(more); |
2230 | rbd_assert(which < img_request->obj_request_count); | |
2231 | ||
2232 | if (!obj_request_done_test(obj_request)) | |
2233 | break; | |
1217857f | 2234 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2235 | which++; |
2236 | } | |
2237 | ||
2238 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2239 | img_request->next_completion = which; | |
2240 | out: | |
2241 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2242 | rbd_img_request_put(img_request); |
2169238d AE |
2243 | |
2244 | if (!more) | |
2245 | rbd_img_request_complete(img_request); | |
2246 | } | |
2247 | ||
f1a4739f AE |
2248 | /* |
2249 | * Split up an image request into one or more object requests, each | |
2250 | * to a different object. The "type" parameter indicates whether | |
2251 | * "data_desc" is the pointer to the head of a list of bio | |
2252 | * structures, or the base of a page array. In either case this | |
2253 | * function assumes data_desc describes memory sufficient to hold | |
2254 | * all data described by the image request. | |
2255 | */ | |
2256 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2257 | enum obj_request_type type, | |
2258 | void *data_desc) | |
bf0d5f50 AE |
2259 | { |
2260 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2261 | struct rbd_obj_request *obj_request = NULL; | |
2262 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 2263 | bool write_request = img_request_write_test(img_request); |
a158073c | 2264 | struct bio *bio_list = NULL; |
f1a4739f | 2265 | unsigned int bio_offset = 0; |
a158073c | 2266 | struct page **pages = NULL; |
7da22d29 | 2267 | u64 img_offset; |
bf0d5f50 AE |
2268 | u64 resid; |
2269 | u16 opcode; | |
2270 | ||
f1a4739f AE |
2271 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2272 | (int)type, data_desc); | |
37206ee5 | 2273 | |
430c28c3 | 2274 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 2275 | img_offset = img_request->offset; |
bf0d5f50 | 2276 | resid = img_request->length; |
4dda41d3 | 2277 | rbd_assert(resid > 0); |
f1a4739f AE |
2278 | |
2279 | if (type == OBJ_REQUEST_BIO) { | |
2280 | bio_list = data_desc; | |
4f024f37 KO |
2281 | rbd_assert(img_offset == |
2282 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
f1a4739f AE |
2283 | } else { |
2284 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
2285 | pages = data_desc; | |
2286 | } | |
2287 | ||
bf0d5f50 | 2288 | while (resid) { |
2fa12320 | 2289 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2290 | const char *object_name; |
bf0d5f50 AE |
2291 | u64 offset; |
2292 | u64 length; | |
0ccd5926 | 2293 | unsigned int which = 0; |
bf0d5f50 | 2294 | |
7da22d29 | 2295 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2296 | if (!object_name) |
2297 | goto out_unwind; | |
7da22d29 AE |
2298 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2299 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2300 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2301 | offset, length, type); |
78c2a44a AE |
2302 | /* object request has its own copy of the object name */ |
2303 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2304 | if (!obj_request) |
2305 | goto out_unwind; | |
62054da6 | 2306 | |
03507db6 JD |
2307 | /* |
2308 | * set obj_request->img_request before creating the | |
2309 | * osd_request so that it gets the right snapc | |
2310 | */ | |
2311 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2312 | |
f1a4739f AE |
2313 | if (type == OBJ_REQUEST_BIO) { |
2314 | unsigned int clone_size; | |
2315 | ||
2316 | rbd_assert(length <= (u64)UINT_MAX); | |
2317 | clone_size = (unsigned int)length; | |
2318 | obj_request->bio_list = | |
2319 | bio_chain_clone_range(&bio_list, | |
2320 | &bio_offset, | |
2321 | clone_size, | |
2322 | GFP_ATOMIC); | |
2323 | if (!obj_request->bio_list) | |
62054da6 | 2324 | goto out_unwind; |
f1a4739f AE |
2325 | } else { |
2326 | unsigned int page_count; | |
2327 | ||
2328 | obj_request->pages = pages; | |
2329 | page_count = (u32)calc_pages_for(offset, length); | |
2330 | obj_request->page_count = page_count; | |
2331 | if ((offset + length) & ~PAGE_MASK) | |
2332 | page_count--; /* more on last page */ | |
2333 | pages += page_count; | |
2334 | } | |
bf0d5f50 | 2335 | |
0ccd5926 ID |
2336 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
2337 | (write_request ? 2 : 1), | |
deb236b3 | 2338 | obj_request); |
2fa12320 | 2339 | if (!osd_req) |
62054da6 | 2340 | goto out_unwind; |
2fa12320 | 2341 | obj_request->osd_req = osd_req; |
2169238d | 2342 | obj_request->callback = rbd_img_obj_callback; |
0f2d5be7 | 2343 | rbd_img_request_get(img_request); |
430c28c3 | 2344 | |
0ccd5926 ID |
2345 | if (write_request) { |
2346 | osd_req_op_alloc_hint_init(osd_req, which, | |
2347 | rbd_obj_bytes(&rbd_dev->header), | |
2348 | rbd_obj_bytes(&rbd_dev->header)); | |
2349 | which++; | |
2350 | } | |
2351 | ||
2352 | osd_req_op_extent_init(osd_req, which, opcode, offset, length, | |
2353 | 0, 0); | |
f1a4739f | 2354 | if (type == OBJ_REQUEST_BIO) |
0ccd5926 | 2355 | osd_req_op_extent_osd_data_bio(osd_req, which, |
f1a4739f AE |
2356 | obj_request->bio_list, length); |
2357 | else | |
0ccd5926 | 2358 | osd_req_op_extent_osd_data_pages(osd_req, which, |
f1a4739f AE |
2359 | obj_request->pages, length, |
2360 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
2361 | |
2362 | if (write_request) | |
2363 | rbd_osd_req_format_write(obj_request); | |
2364 | else | |
2365 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 2366 | |
7da22d29 | 2367 | obj_request->img_offset = img_offset; |
bf0d5f50 | 2368 | |
7da22d29 | 2369 | img_offset += length; |
bf0d5f50 AE |
2370 | resid -= length; |
2371 | } | |
2372 | ||
2373 | return 0; | |
2374 | ||
bf0d5f50 AE |
2375 | out_unwind: |
2376 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2377 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2378 | |
2379 | return -ENOMEM; | |
2380 | } | |
2381 | ||
0eefd470 AE |
2382 | static void |
2383 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2384 | { | |
2385 | struct rbd_img_request *img_request; | |
2386 | struct rbd_device *rbd_dev; | |
ebda6408 | 2387 | struct page **pages; |
0eefd470 AE |
2388 | u32 page_count; |
2389 | ||
2390 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2391 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2392 | img_request = obj_request->img_request; | |
2393 | rbd_assert(img_request); | |
2394 | ||
2395 | rbd_dev = img_request->rbd_dev; | |
2396 | rbd_assert(rbd_dev); | |
0eefd470 | 2397 | |
ebda6408 AE |
2398 | pages = obj_request->copyup_pages; |
2399 | rbd_assert(pages != NULL); | |
0eefd470 | 2400 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2401 | page_count = obj_request->copyup_page_count; |
2402 | rbd_assert(page_count); | |
2403 | obj_request->copyup_page_count = 0; | |
2404 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2405 | |
2406 | /* | |
2407 | * We want the transfer count to reflect the size of the | |
2408 | * original write request. There is no such thing as a | |
2409 | * successful short write, so if the request was successful | |
2410 | * we can just set it to the originally-requested length. | |
2411 | */ | |
2412 | if (!obj_request->result) | |
2413 | obj_request->xferred = obj_request->length; | |
2414 | ||
2415 | /* Finish up with the normal image object callback */ | |
2416 | ||
2417 | rbd_img_obj_callback(obj_request); | |
2418 | } | |
2419 | ||
3d7efd18 AE |
2420 | static void |
2421 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2422 | { | |
2423 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2424 | struct ceph_osd_request *osd_req; |
2425 | struct ceph_osd_client *osdc; | |
2426 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2427 | struct page **pages; |
ebda6408 | 2428 | u32 page_count; |
bbea1c1a | 2429 | int img_result; |
ebda6408 | 2430 | u64 parent_length; |
b91f09f1 AE |
2431 | u64 offset; |
2432 | u64 length; | |
3d7efd18 AE |
2433 | |
2434 | rbd_assert(img_request_child_test(img_request)); | |
2435 | ||
2436 | /* First get what we need from the image request */ | |
2437 | ||
2438 | pages = img_request->copyup_pages; | |
2439 | rbd_assert(pages != NULL); | |
2440 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2441 | page_count = img_request->copyup_page_count; |
2442 | rbd_assert(page_count); | |
2443 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2444 | |
2445 | orig_request = img_request->obj_request; | |
2446 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2447 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2448 | img_result = img_request->result; |
ebda6408 AE |
2449 | parent_length = img_request->length; |
2450 | rbd_assert(parent_length == img_request->xferred); | |
91c6febb | 2451 | rbd_img_request_put(img_request); |
3d7efd18 | 2452 | |
91c6febb AE |
2453 | rbd_assert(orig_request->img_request); |
2454 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2455 | rbd_assert(rbd_dev); |
0eefd470 | 2456 | |
bbea1c1a AE |
2457 | /* |
2458 | * If the overlap has become 0 (most likely because the | |
2459 | * image has been flattened) we need to free the pages | |
2460 | * and re-submit the original write request. | |
2461 | */ | |
2462 | if (!rbd_dev->parent_overlap) { | |
2463 | struct ceph_osd_client *osdc; | |
3d7efd18 | 2464 | |
bbea1c1a AE |
2465 | ceph_release_page_vector(pages, page_count); |
2466 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2467 | img_result = rbd_obj_request_submit(osdc, orig_request); | |
2468 | if (!img_result) | |
2469 | return; | |
2470 | } | |
0eefd470 | 2471 | |
bbea1c1a | 2472 | if (img_result) |
0eefd470 | 2473 | goto out_err; |
0eefd470 | 2474 | |
8785b1d4 AE |
2475 | /* |
2476 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2477 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2478 | * request. Allocate the new copyup osd request for the |
2479 | * original request, and release the old one. | |
2480 | */ | |
bbea1c1a | 2481 | img_result = -ENOMEM; |
0eefd470 AE |
2482 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2483 | if (!osd_req) | |
2484 | goto out_err; | |
8785b1d4 | 2485 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2486 | orig_request->osd_req = osd_req; |
2487 | orig_request->copyup_pages = pages; | |
ebda6408 | 2488 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2489 | |
0eefd470 | 2490 | /* Initialize the copyup op */ |
3d7efd18 | 2491 | |
0eefd470 | 2492 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2493 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2494 | false, false); |
3d7efd18 | 2495 | |
0ccd5926 ID |
2496 | /* Then the hint op */ |
2497 | ||
2498 | osd_req_op_alloc_hint_init(osd_req, 1, rbd_obj_bytes(&rbd_dev->header), | |
2499 | rbd_obj_bytes(&rbd_dev->header)); | |
2500 | ||
2501 | /* And the original write request op */ | |
0eefd470 | 2502 | |
b91f09f1 AE |
2503 | offset = orig_request->offset; |
2504 | length = orig_request->length; | |
0ccd5926 | 2505 | osd_req_op_extent_init(osd_req, 2, CEPH_OSD_OP_WRITE, |
b91f09f1 AE |
2506 | offset, length, 0, 0); |
2507 | if (orig_request->type == OBJ_REQUEST_BIO) | |
0ccd5926 | 2508 | osd_req_op_extent_osd_data_bio(osd_req, 2, |
b91f09f1 AE |
2509 | orig_request->bio_list, length); |
2510 | else | |
0ccd5926 | 2511 | osd_req_op_extent_osd_data_pages(osd_req, 2, |
b91f09f1 AE |
2512 | orig_request->pages, length, |
2513 | offset & ~PAGE_MASK, false, false); | |
0eefd470 AE |
2514 | |
2515 | rbd_osd_req_format_write(orig_request); | |
2516 | ||
2517 | /* All set, send it off. */ | |
2518 | ||
2519 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2520 | osdc = &rbd_dev->rbd_client->client->osdc; | |
bbea1c1a AE |
2521 | img_result = rbd_obj_request_submit(osdc, orig_request); |
2522 | if (!img_result) | |
0eefd470 AE |
2523 | return; |
2524 | out_err: | |
2525 | /* Record the error code and complete the request */ | |
2526 | ||
bbea1c1a | 2527 | orig_request->result = img_result; |
0eefd470 AE |
2528 | orig_request->xferred = 0; |
2529 | obj_request_done_set(orig_request); | |
2530 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2531 | } |
2532 | ||
2533 | /* | |
2534 | * Read from the parent image the range of data that covers the | |
2535 | * entire target of the given object request. This is used for | |
2536 | * satisfying a layered image write request when the target of an | |
2537 | * object request from the image request does not exist. | |
2538 | * | |
2539 | * A page array big enough to hold the returned data is allocated | |
2540 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2541 | * When the read completes, this page array will be transferred to | |
2542 | * the original object request for the copyup operation. | |
2543 | * | |
2544 | * If an error occurs, record it as the result of the original | |
2545 | * object request and mark it done so it gets completed. | |
2546 | */ | |
2547 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2548 | { | |
2549 | struct rbd_img_request *img_request = NULL; | |
2550 | struct rbd_img_request *parent_request = NULL; | |
2551 | struct rbd_device *rbd_dev; | |
2552 | u64 img_offset; | |
2553 | u64 length; | |
2554 | struct page **pages = NULL; | |
2555 | u32 page_count; | |
2556 | int result; | |
2557 | ||
2558 | rbd_assert(obj_request_img_data_test(obj_request)); | |
b91f09f1 | 2559 | rbd_assert(obj_request_type_valid(obj_request->type)); |
3d7efd18 AE |
2560 | |
2561 | img_request = obj_request->img_request; | |
2562 | rbd_assert(img_request != NULL); | |
2563 | rbd_dev = img_request->rbd_dev; | |
2564 | rbd_assert(rbd_dev->parent != NULL); | |
2565 | ||
2566 | /* | |
2567 | * Determine the byte range covered by the object in the | |
2568 | * child image to which the original request was to be sent. | |
2569 | */ | |
2570 | img_offset = obj_request->img_offset - obj_request->offset; | |
2571 | length = (u64)1 << rbd_dev->header.obj_order; | |
2572 | ||
a9e8ba2c AE |
2573 | /* |
2574 | * There is no defined parent data beyond the parent | |
2575 | * overlap, so limit what we read at that boundary if | |
2576 | * necessary. | |
2577 | */ | |
2578 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2579 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2580 | length = rbd_dev->parent_overlap - img_offset; | |
2581 | } | |
2582 | ||
3d7efd18 AE |
2583 | /* |
2584 | * Allocate a page array big enough to receive the data read | |
2585 | * from the parent. | |
2586 | */ | |
2587 | page_count = (u32)calc_pages_for(0, length); | |
2588 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2589 | if (IS_ERR(pages)) { | |
2590 | result = PTR_ERR(pages); | |
2591 | pages = NULL; | |
2592 | goto out_err; | |
2593 | } | |
2594 | ||
2595 | result = -ENOMEM; | |
e93f3152 AE |
2596 | parent_request = rbd_parent_request_create(obj_request, |
2597 | img_offset, length); | |
3d7efd18 AE |
2598 | if (!parent_request) |
2599 | goto out_err; | |
3d7efd18 AE |
2600 | |
2601 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2602 | if (result) | |
2603 | goto out_err; | |
2604 | parent_request->copyup_pages = pages; | |
ebda6408 | 2605 | parent_request->copyup_page_count = page_count; |
3d7efd18 AE |
2606 | |
2607 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2608 | result = rbd_img_request_submit(parent_request); | |
2609 | if (!result) | |
2610 | return 0; | |
2611 | ||
2612 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2613 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2614 | parent_request->obj_request = NULL; |
2615 | rbd_obj_request_put(obj_request); | |
2616 | out_err: | |
2617 | if (pages) | |
2618 | ceph_release_page_vector(pages, page_count); | |
2619 | if (parent_request) | |
2620 | rbd_img_request_put(parent_request); | |
2621 | obj_request->result = result; | |
2622 | obj_request->xferred = 0; | |
2623 | obj_request_done_set(obj_request); | |
2624 | ||
2625 | return result; | |
2626 | } | |
2627 | ||
c5b5ef6c AE |
2628 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2629 | { | |
c5b5ef6c | 2630 | struct rbd_obj_request *orig_request; |
638f5abe | 2631 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2632 | int result; |
2633 | ||
2634 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2635 | ||
2636 | /* | |
2637 | * All we need from the object request is the original | |
2638 | * request and the result of the STAT op. Grab those, then | |
2639 | * we're done with the request. | |
2640 | */ | |
2641 | orig_request = obj_request->obj_request; | |
2642 | obj_request->obj_request = NULL; | |
912c317d | 2643 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2644 | rbd_assert(orig_request); |
2645 | rbd_assert(orig_request->img_request); | |
2646 | ||
2647 | result = obj_request->result; | |
2648 | obj_request->result = 0; | |
2649 | ||
2650 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2651 | obj_request, orig_request, result, | |
2652 | obj_request->xferred, obj_request->length); | |
2653 | rbd_obj_request_put(obj_request); | |
2654 | ||
638f5abe AE |
2655 | /* |
2656 | * If the overlap has become 0 (most likely because the | |
2657 | * image has been flattened) we need to free the pages | |
2658 | * and re-submit the original write request. | |
2659 | */ | |
2660 | rbd_dev = orig_request->img_request->rbd_dev; | |
2661 | if (!rbd_dev->parent_overlap) { | |
2662 | struct ceph_osd_client *osdc; | |
2663 | ||
638f5abe AE |
2664 | osdc = &rbd_dev->rbd_client->client->osdc; |
2665 | result = rbd_obj_request_submit(osdc, orig_request); | |
2666 | if (!result) | |
2667 | return; | |
2668 | } | |
c5b5ef6c AE |
2669 | |
2670 | /* | |
2671 | * Our only purpose here is to determine whether the object | |
2672 | * exists, and we don't want to treat the non-existence as | |
2673 | * an error. If something else comes back, transfer the | |
2674 | * error to the original request and complete it now. | |
2675 | */ | |
2676 | if (!result) { | |
2677 | obj_request_existence_set(orig_request, true); | |
2678 | } else if (result == -ENOENT) { | |
2679 | obj_request_existence_set(orig_request, false); | |
2680 | } else if (result) { | |
2681 | orig_request->result = result; | |
3d7efd18 | 2682 | goto out; |
c5b5ef6c AE |
2683 | } |
2684 | ||
2685 | /* | |
2686 | * Resubmit the original request now that we have recorded | |
2687 | * whether the target object exists. | |
2688 | */ | |
b454e36d | 2689 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2690 | out: |
c5b5ef6c AE |
2691 | if (orig_request->result) |
2692 | rbd_obj_request_complete(orig_request); | |
c5b5ef6c AE |
2693 | } |
2694 | ||
2695 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2696 | { | |
2697 | struct rbd_obj_request *stat_request; | |
2698 | struct rbd_device *rbd_dev; | |
2699 | struct ceph_osd_client *osdc; | |
2700 | struct page **pages = NULL; | |
2701 | u32 page_count; | |
2702 | size_t size; | |
2703 | int ret; | |
2704 | ||
2705 | /* | |
2706 | * The response data for a STAT call consists of: | |
2707 | * le64 length; | |
2708 | * struct { | |
2709 | * le32 tv_sec; | |
2710 | * le32 tv_nsec; | |
2711 | * } mtime; | |
2712 | */ | |
2713 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2714 | page_count = (u32)calc_pages_for(0, size); | |
2715 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2716 | if (IS_ERR(pages)) | |
2717 | return PTR_ERR(pages); | |
2718 | ||
2719 | ret = -ENOMEM; | |
2720 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2721 | OBJ_REQUEST_PAGES); | |
2722 | if (!stat_request) | |
2723 | goto out; | |
2724 | ||
2725 | rbd_obj_request_get(obj_request); | |
2726 | stat_request->obj_request = obj_request; | |
2727 | stat_request->pages = pages; | |
2728 | stat_request->page_count = page_count; | |
2729 | ||
2730 | rbd_assert(obj_request->img_request); | |
2731 | rbd_dev = obj_request->img_request->rbd_dev; | |
deb236b3 ID |
2732 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
2733 | stat_request); | |
c5b5ef6c AE |
2734 | if (!stat_request->osd_req) |
2735 | goto out; | |
2736 | stat_request->callback = rbd_img_obj_exists_callback; | |
2737 | ||
2738 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2739 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2740 | false, false); | |
9d4df01f | 2741 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2742 | |
2743 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2744 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2745 | out: | |
2746 | if (ret) | |
2747 | rbd_obj_request_put(obj_request); | |
2748 | ||
2749 | return ret; | |
2750 | } | |
2751 | ||
b454e36d AE |
2752 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2753 | { | |
2754 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2755 | struct rbd_device *rbd_dev; |
3d7efd18 | 2756 | bool known; |
b454e36d AE |
2757 | |
2758 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2759 | ||
2760 | img_request = obj_request->img_request; | |
2761 | rbd_assert(img_request); | |
a9e8ba2c | 2762 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2763 | |
b454e36d | 2764 | /* |
a9e8ba2c AE |
2765 | * Only writes to layered images need special handling. |
2766 | * Reads and non-layered writes are simple object requests. | |
2767 | * Layered writes that start beyond the end of the overlap | |
2768 | * with the parent have no parent data, so they too are | |
2769 | * simple object requests. Finally, if the target object is | |
2770 | * known to already exist, its parent data has already been | |
2771 | * copied, so a write to the object can also be handled as a | |
2772 | * simple object request. | |
b454e36d AE |
2773 | */ |
2774 | if (!img_request_write_test(img_request) || | |
2775 | !img_request_layered_test(img_request) || | |
9638556a | 2776 | !obj_request_overlaps_parent(obj_request) || |
3d7efd18 AE |
2777 | ((known = obj_request_known_test(obj_request)) && |
2778 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2779 | |
2780 | struct rbd_device *rbd_dev; | |
2781 | struct ceph_osd_client *osdc; | |
2782 | ||
2783 | rbd_dev = obj_request->img_request->rbd_dev; | |
2784 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2785 | ||
2786 | return rbd_obj_request_submit(osdc, obj_request); | |
2787 | } | |
2788 | ||
2789 | /* | |
3d7efd18 AE |
2790 | * It's a layered write. The target object might exist but |
2791 | * we may not know that yet. If we know it doesn't exist, | |
2792 | * start by reading the data for the full target object from | |
2793 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2794 | */ |
3d7efd18 AE |
2795 | if (known) |
2796 | return rbd_img_obj_parent_read_full(obj_request); | |
2797 | ||
2798 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2799 | |
2800 | return rbd_img_obj_exists_submit(obj_request); | |
2801 | } | |
2802 | ||
bf0d5f50 AE |
2803 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2804 | { | |
bf0d5f50 | 2805 | struct rbd_obj_request *obj_request; |
46faeed4 | 2806 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2807 | |
37206ee5 | 2808 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2809 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2810 | int ret; |
2811 | ||
b454e36d | 2812 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2813 | if (ret) |
2814 | return ret; | |
bf0d5f50 AE |
2815 | } |
2816 | ||
2817 | return 0; | |
2818 | } | |
8b3e1a56 AE |
2819 | |
2820 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2821 | { | |
2822 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2823 | struct rbd_device *rbd_dev; |
2824 | u64 obj_end; | |
02c74fba AE |
2825 | u64 img_xferred; |
2826 | int img_result; | |
8b3e1a56 AE |
2827 | |
2828 | rbd_assert(img_request_child_test(img_request)); | |
2829 | ||
02c74fba AE |
2830 | /* First get what we need from the image request and release it */ |
2831 | ||
8b3e1a56 | 2832 | obj_request = img_request->obj_request; |
02c74fba AE |
2833 | img_xferred = img_request->xferred; |
2834 | img_result = img_request->result; | |
2835 | rbd_img_request_put(img_request); | |
2836 | ||
2837 | /* | |
2838 | * If the overlap has become 0 (most likely because the | |
2839 | * image has been flattened) we need to re-submit the | |
2840 | * original request. | |
2841 | */ | |
a9e8ba2c AE |
2842 | rbd_assert(obj_request); |
2843 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
2844 | rbd_dev = obj_request->img_request->rbd_dev; |
2845 | if (!rbd_dev->parent_overlap) { | |
2846 | struct ceph_osd_client *osdc; | |
2847 | ||
2848 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2849 | img_result = rbd_obj_request_submit(osdc, obj_request); | |
2850 | if (!img_result) | |
2851 | return; | |
2852 | } | |
a9e8ba2c | 2853 | |
02c74fba | 2854 | obj_request->result = img_result; |
a9e8ba2c AE |
2855 | if (obj_request->result) |
2856 | goto out; | |
2857 | ||
2858 | /* | |
2859 | * We need to zero anything beyond the parent overlap | |
2860 | * boundary. Since rbd_img_obj_request_read_callback() | |
2861 | * will zero anything beyond the end of a short read, an | |
2862 | * easy way to do this is to pretend the data from the | |
2863 | * parent came up short--ending at the overlap boundary. | |
2864 | */ | |
2865 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2866 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
2867 | if (obj_end > rbd_dev->parent_overlap) { |
2868 | u64 xferred = 0; | |
2869 | ||
2870 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2871 | xferred = rbd_dev->parent_overlap - | |
2872 | obj_request->img_offset; | |
8b3e1a56 | 2873 | |
02c74fba | 2874 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 2875 | } else { |
02c74fba | 2876 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
2877 | } |
2878 | out: | |
8b3e1a56 AE |
2879 | rbd_img_obj_request_read_callback(obj_request); |
2880 | rbd_obj_request_complete(obj_request); | |
2881 | } | |
2882 | ||
2883 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2884 | { | |
8b3e1a56 AE |
2885 | struct rbd_img_request *img_request; |
2886 | int result; | |
2887 | ||
2888 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2889 | rbd_assert(obj_request->img_request != NULL); | |
2890 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 2891 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 2892 | |
8b3e1a56 | 2893 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 2894 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 2895 | obj_request->img_offset, |
e93f3152 | 2896 | obj_request->length); |
8b3e1a56 AE |
2897 | result = -ENOMEM; |
2898 | if (!img_request) | |
2899 | goto out_err; | |
2900 | ||
5b2ab72d AE |
2901 | if (obj_request->type == OBJ_REQUEST_BIO) |
2902 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
2903 | obj_request->bio_list); | |
2904 | else | |
2905 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
2906 | obj_request->pages); | |
8b3e1a56 AE |
2907 | if (result) |
2908 | goto out_err; | |
2909 | ||
2910 | img_request->callback = rbd_img_parent_read_callback; | |
2911 | result = rbd_img_request_submit(img_request); | |
2912 | if (result) | |
2913 | goto out_err; | |
2914 | ||
2915 | return; | |
2916 | out_err: | |
2917 | if (img_request) | |
2918 | rbd_img_request_put(img_request); | |
2919 | obj_request->result = result; | |
2920 | obj_request->xferred = 0; | |
2921 | obj_request_done_set(obj_request); | |
2922 | } | |
bf0d5f50 | 2923 | |
20e0af67 | 2924 | static int rbd_obj_notify_ack_sync(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2925 | { |
2926 | struct rbd_obj_request *obj_request; | |
2169238d | 2927 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2928 | int ret; |
2929 | ||
2930 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2931 | OBJ_REQUEST_NODATA); | |
2932 | if (!obj_request) | |
2933 | return -ENOMEM; | |
2934 | ||
2935 | ret = -ENOMEM; | |
deb236b3 ID |
2936 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
2937 | obj_request); | |
b8d70035 AE |
2938 | if (!obj_request->osd_req) |
2939 | goto out; | |
2940 | ||
c99d2d4a | 2941 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2942 | notify_id, 0, 0); |
9d4df01f | 2943 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2944 | |
b8d70035 | 2945 | ret = rbd_obj_request_submit(osdc, obj_request); |
cf81b60e | 2946 | if (ret) |
20e0af67 JD |
2947 | goto out; |
2948 | ret = rbd_obj_request_wait(obj_request); | |
2949 | out: | |
2950 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2951 | |
2952 | return ret; | |
2953 | } | |
2954 | ||
2955 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2956 | { | |
2957 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
e627db08 | 2958 | int ret; |
b8d70035 AE |
2959 | |
2960 | if (!rbd_dev) | |
2961 | return; | |
2962 | ||
37206ee5 | 2963 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2964 | rbd_dev->header_name, (unsigned long long)notify_id, |
2965 | (unsigned int)opcode); | |
e627db08 AE |
2966 | ret = rbd_dev_refresh(rbd_dev); |
2967 | if (ret) | |
3b5cf2a2 | 2968 | rbd_warn(rbd_dev, "header refresh error (%d)\n", ret); |
b8d70035 | 2969 | |
20e0af67 | 2970 | rbd_obj_notify_ack_sync(rbd_dev, notify_id); |
b8d70035 AE |
2971 | } |
2972 | ||
9969ebc5 | 2973 | /* |
b30a01f2 | 2974 | * Initiate a watch request, synchronously. |
9969ebc5 | 2975 | */ |
b30a01f2 | 2976 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev) |
9969ebc5 AE |
2977 | { |
2978 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2979 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
2980 | int ret; |
2981 | ||
b30a01f2 ID |
2982 | rbd_assert(!rbd_dev->watch_event); |
2983 | rbd_assert(!rbd_dev->watch_request); | |
9969ebc5 | 2984 | |
b30a01f2 ID |
2985 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
2986 | &rbd_dev->watch_event); | |
2987 | if (ret < 0) | |
2988 | return ret; | |
2989 | ||
2990 | rbd_assert(rbd_dev->watch_event); | |
9969ebc5 | 2991 | |
9969ebc5 | 2992 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
b30a01f2 ID |
2993 | OBJ_REQUEST_NODATA); |
2994 | if (!obj_request) { | |
2995 | ret = -ENOMEM; | |
9969ebc5 | 2996 | goto out_cancel; |
b30a01f2 | 2997 | } |
9969ebc5 | 2998 | |
deb236b3 ID |
2999 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1, |
3000 | obj_request); | |
b30a01f2 ID |
3001 | if (!obj_request->osd_req) { |
3002 | ret = -ENOMEM; | |
3003 | goto out_put; | |
3004 | } | |
430c28c3 | 3005 | |
b30a01f2 | 3006 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
2169238d AE |
3007 | |
3008 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
b30a01f2 | 3009 | rbd_dev->watch_event->cookie, 0, 1); |
9d4df01f | 3010 | rbd_osd_req_format_write(obj_request); |
2169238d | 3011 | |
9969ebc5 AE |
3012 | ret = rbd_obj_request_submit(osdc, obj_request); |
3013 | if (ret) | |
b30a01f2 ID |
3014 | goto out_linger; |
3015 | ||
9969ebc5 AE |
3016 | ret = rbd_obj_request_wait(obj_request); |
3017 | if (ret) | |
b30a01f2 ID |
3018 | goto out_linger; |
3019 | ||
9969ebc5 AE |
3020 | ret = obj_request->result; |
3021 | if (ret) | |
b30a01f2 | 3022 | goto out_linger; |
9969ebc5 | 3023 | |
8eb87565 AE |
3024 | /* |
3025 | * A watch request is set to linger, so the underlying osd | |
3026 | * request won't go away until we unregister it. We retain | |
3027 | * a pointer to the object request during that time (in | |
3028 | * rbd_dev->watch_request), so we'll keep a reference to | |
3029 | * it. We'll drop that reference (below) after we've | |
3030 | * unregistered it. | |
3031 | */ | |
b30a01f2 | 3032 | rbd_dev->watch_request = obj_request; |
8eb87565 | 3033 | |
b30a01f2 ID |
3034 | return 0; |
3035 | ||
3036 | out_linger: | |
3037 | ceph_osdc_unregister_linger_request(osdc, obj_request->osd_req); | |
3038 | out_put: | |
3039 | rbd_obj_request_put(obj_request); | |
3040 | out_cancel: | |
3041 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
3042 | rbd_dev->watch_event = NULL; | |
3043 | ||
3044 | return ret; | |
3045 | } | |
3046 | ||
3047 | /* | |
3048 | * Tear down a watch request, synchronously. | |
3049 | */ | |
3050 | static int __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev) | |
3051 | { | |
3052 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3053 | struct rbd_obj_request *obj_request; | |
3054 | int ret; | |
3055 | ||
3056 | rbd_assert(rbd_dev->watch_event); | |
3057 | rbd_assert(rbd_dev->watch_request); | |
3058 | ||
3059 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
3060 | OBJ_REQUEST_NODATA); | |
3061 | if (!obj_request) { | |
3062 | ret = -ENOMEM; | |
3063 | goto out_cancel; | |
3064 | } | |
3065 | ||
3066 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1, | |
3067 | obj_request); | |
3068 | if (!obj_request->osd_req) { | |
3069 | ret = -ENOMEM; | |
3070 | goto out_put; | |
8eb87565 AE |
3071 | } |
3072 | ||
b30a01f2 ID |
3073 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, |
3074 | rbd_dev->watch_event->cookie, 0, 0); | |
3075 | rbd_osd_req_format_write(obj_request); | |
3076 | ||
3077 | ret = rbd_obj_request_submit(osdc, obj_request); | |
3078 | if (ret) | |
3079 | goto out_put; | |
3080 | ||
3081 | ret = rbd_obj_request_wait(obj_request); | |
3082 | if (ret) | |
3083 | goto out_put; | |
3084 | ||
3085 | ret = obj_request->result; | |
3086 | if (ret) | |
3087 | goto out_put; | |
3088 | ||
8eb87565 AE |
3089 | /* We have successfully torn down the watch request */ |
3090 | ||
b30a01f2 ID |
3091 | ceph_osdc_unregister_linger_request(osdc, |
3092 | rbd_dev->watch_request->osd_req); | |
8eb87565 AE |
3093 | rbd_obj_request_put(rbd_dev->watch_request); |
3094 | rbd_dev->watch_request = NULL; | |
b30a01f2 ID |
3095 | |
3096 | out_put: | |
3097 | rbd_obj_request_put(obj_request); | |
9969ebc5 | 3098 | out_cancel: |
9969ebc5 AE |
3099 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
3100 | rbd_dev->watch_event = NULL; | |
9969ebc5 AE |
3101 | |
3102 | return ret; | |
3103 | } | |
3104 | ||
fca27065 ID |
3105 | static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev) |
3106 | { | |
3107 | int ret; | |
3108 | ||
b30a01f2 | 3109 | ret = __rbd_dev_header_unwatch_sync(rbd_dev); |
fca27065 ID |
3110 | if (ret) { |
3111 | rbd_warn(rbd_dev, "unable to tear down watch request: %d\n", | |
3112 | ret); | |
3113 | } | |
3114 | } | |
3115 | ||
36be9a76 | 3116 | /* |
f40eb349 AE |
3117 | * Synchronous osd object method call. Returns the number of bytes |
3118 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3119 | */ |
3120 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
3121 | const char *object_name, | |
3122 | const char *class_name, | |
3123 | const char *method_name, | |
4157976b | 3124 | const void *outbound, |
36be9a76 | 3125 | size_t outbound_size, |
4157976b | 3126 | void *inbound, |
e2a58ee5 | 3127 | size_t inbound_size) |
36be9a76 | 3128 | { |
2169238d | 3129 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 3130 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
3131 | struct page **pages; |
3132 | u32 page_count; | |
3133 | int ret; | |
3134 | ||
3135 | /* | |
6010a451 AE |
3136 | * Method calls are ultimately read operations. The result |
3137 | * should placed into the inbound buffer provided. They | |
3138 | * also supply outbound data--parameters for the object | |
3139 | * method. Currently if this is present it will be a | |
3140 | * snapshot id. | |
36be9a76 | 3141 | */ |
57385b51 | 3142 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
3143 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
3144 | if (IS_ERR(pages)) | |
3145 | return PTR_ERR(pages); | |
3146 | ||
3147 | ret = -ENOMEM; | |
6010a451 | 3148 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
3149 | OBJ_REQUEST_PAGES); |
3150 | if (!obj_request) | |
3151 | goto out; | |
3152 | ||
3153 | obj_request->pages = pages; | |
3154 | obj_request->page_count = page_count; | |
3155 | ||
deb236b3 ID |
3156 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
3157 | obj_request); | |
36be9a76 AE |
3158 | if (!obj_request->osd_req) |
3159 | goto out; | |
3160 | ||
c99d2d4a | 3161 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
3162 | class_name, method_name); |
3163 | if (outbound_size) { | |
3164 | struct ceph_pagelist *pagelist; | |
3165 | ||
3166 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
3167 | if (!pagelist) | |
3168 | goto out; | |
3169 | ||
3170 | ceph_pagelist_init(pagelist); | |
3171 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
3172 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
3173 | pagelist); | |
3174 | } | |
a4ce40a9 AE |
3175 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
3176 | obj_request->pages, inbound_size, | |
44cd188d | 3177 | 0, false, false); |
9d4df01f | 3178 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3179 | |
36be9a76 AE |
3180 | ret = rbd_obj_request_submit(osdc, obj_request); |
3181 | if (ret) | |
3182 | goto out; | |
3183 | ret = rbd_obj_request_wait(obj_request); | |
3184 | if (ret) | |
3185 | goto out; | |
3186 | ||
3187 | ret = obj_request->result; | |
3188 | if (ret < 0) | |
3189 | goto out; | |
57385b51 AE |
3190 | |
3191 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
3192 | ret = (int)obj_request->xferred; | |
903bb32e | 3193 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
3194 | out: |
3195 | if (obj_request) | |
3196 | rbd_obj_request_put(obj_request); | |
3197 | else | |
3198 | ceph_release_page_vector(pages, page_count); | |
3199 | ||
3200 | return ret; | |
3201 | } | |
3202 | ||
bf0d5f50 | 3203 | static void rbd_request_fn(struct request_queue *q) |
cc344fa1 | 3204 | __releases(q->queue_lock) __acquires(q->queue_lock) |
bf0d5f50 AE |
3205 | { |
3206 | struct rbd_device *rbd_dev = q->queuedata; | |
bf0d5f50 AE |
3207 | struct request *rq; |
3208 | int result; | |
3209 | ||
3210 | while ((rq = blk_fetch_request(q))) { | |
3211 | bool write_request = rq_data_dir(rq) == WRITE; | |
3212 | struct rbd_img_request *img_request; | |
3213 | u64 offset; | |
3214 | u64 length; | |
3215 | ||
3216 | /* Ignore any non-FS requests that filter through. */ | |
3217 | ||
3218 | if (rq->cmd_type != REQ_TYPE_FS) { | |
4dda41d3 AE |
3219 | dout("%s: non-fs request type %d\n", __func__, |
3220 | (int) rq->cmd_type); | |
3221 | __blk_end_request_all(rq, 0); | |
3222 | continue; | |
3223 | } | |
3224 | ||
3225 | /* Ignore/skip any zero-length requests */ | |
3226 | ||
3227 | offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; | |
3228 | length = (u64) blk_rq_bytes(rq); | |
3229 | ||
3230 | if (!length) { | |
3231 | dout("%s: zero-length request\n", __func__); | |
bf0d5f50 AE |
3232 | __blk_end_request_all(rq, 0); |
3233 | continue; | |
3234 | } | |
3235 | ||
3236 | spin_unlock_irq(q->queue_lock); | |
3237 | ||
3238 | /* Disallow writes to a read-only device */ | |
3239 | ||
3240 | if (write_request) { | |
3241 | result = -EROFS; | |
131fd9f6 | 3242 | if (rbd_dev->mapping.read_only) |
bf0d5f50 AE |
3243 | goto end_request; |
3244 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); | |
3245 | } | |
3246 | ||
6d292906 AE |
3247 | /* |
3248 | * Quit early if the mapped snapshot no longer | |
3249 | * exists. It's still possible the snapshot will | |
3250 | * have disappeared by the time our request arrives | |
3251 | * at the osd, but there's no sense in sending it if | |
3252 | * we already know. | |
3253 | */ | |
3254 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
bf0d5f50 AE |
3255 | dout("request for non-existent snapshot"); |
3256 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3257 | result = -ENXIO; | |
3258 | goto end_request; | |
3259 | } | |
3260 | ||
bf0d5f50 | 3261 | result = -EINVAL; |
c0cd10db AE |
3262 | if (offset && length > U64_MAX - offset + 1) { |
3263 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n", | |
3264 | offset, length); | |
bf0d5f50 | 3265 | goto end_request; /* Shouldn't happen */ |
c0cd10db | 3266 | } |
bf0d5f50 | 3267 | |
00a653e2 AE |
3268 | result = -EIO; |
3269 | if (offset + length > rbd_dev->mapping.size) { | |
3270 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)\n", | |
3271 | offset, length, rbd_dev->mapping.size); | |
3272 | goto end_request; | |
3273 | } | |
3274 | ||
bf0d5f50 AE |
3275 | result = -ENOMEM; |
3276 | img_request = rbd_img_request_create(rbd_dev, offset, length, | |
e93f3152 | 3277 | write_request); |
bf0d5f50 AE |
3278 | if (!img_request) |
3279 | goto end_request; | |
3280 | ||
3281 | img_request->rq = rq; | |
3282 | ||
f1a4739f AE |
3283 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
3284 | rq->bio); | |
bf0d5f50 AE |
3285 | if (!result) |
3286 | result = rbd_img_request_submit(img_request); | |
3287 | if (result) | |
3288 | rbd_img_request_put(img_request); | |
3289 | end_request: | |
3290 | spin_lock_irq(q->queue_lock); | |
3291 | if (result < 0) { | |
7da22d29 AE |
3292 | rbd_warn(rbd_dev, "%s %llx at %llx result %d\n", |
3293 | write_request ? "write" : "read", | |
3294 | length, offset, result); | |
3295 | ||
bf0d5f50 AE |
3296 | __blk_end_request_all(rq, result); |
3297 | } | |
3298 | } | |
3299 | } | |
3300 | ||
602adf40 YS |
3301 | /* |
3302 | * a queue callback. Makes sure that we don't create a bio that spans across | |
3303 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 3304 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
3305 | */ |
3306 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
3307 | struct bio_vec *bvec) | |
3308 | { | |
3309 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
3310 | sector_t sector_offset; |
3311 | sector_t sectors_per_obj; | |
3312 | sector_t obj_sector_offset; | |
3313 | int ret; | |
3314 | ||
3315 | /* | |
3316 | * Find how far into its rbd object the partition-relative | |
3317 | * bio start sector is to offset relative to the enclosing | |
3318 | * device. | |
3319 | */ | |
3320 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
3321 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
3322 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
3323 | ||
3324 | /* | |
3325 | * Compute the number of bytes from that offset to the end | |
3326 | * of the object. Account for what's already used by the bio. | |
3327 | */ | |
3328 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
3329 | if (ret > bmd->bi_size) | |
3330 | ret -= bmd->bi_size; | |
3331 | else | |
3332 | ret = 0; | |
3333 | ||
3334 | /* | |
3335 | * Don't send back more than was asked for. And if the bio | |
3336 | * was empty, let the whole thing through because: "Note | |
3337 | * that a block device *must* allow a single page to be | |
3338 | * added to an empty bio." | |
3339 | */ | |
3340 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
3341 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
3342 | ret = (int) bvec->bv_len; | |
3343 | ||
3344 | return ret; | |
602adf40 YS |
3345 | } |
3346 | ||
3347 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
3348 | { | |
3349 | struct gendisk *disk = rbd_dev->disk; | |
3350 | ||
3351 | if (!disk) | |
3352 | return; | |
3353 | ||
a0cab924 AE |
3354 | rbd_dev->disk = NULL; |
3355 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 3356 | del_gendisk(disk); |
a0cab924 AE |
3357 | if (disk->queue) |
3358 | blk_cleanup_queue(disk->queue); | |
3359 | } | |
602adf40 YS |
3360 | put_disk(disk); |
3361 | } | |
3362 | ||
788e2df3 AE |
3363 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
3364 | const char *object_name, | |
7097f8df | 3365 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
3366 | |
3367 | { | |
2169238d | 3368 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 3369 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
3370 | struct page **pages = NULL; |
3371 | u32 page_count; | |
1ceae7ef | 3372 | size_t size; |
788e2df3 AE |
3373 | int ret; |
3374 | ||
3375 | page_count = (u32) calc_pages_for(offset, length); | |
3376 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
3377 | if (IS_ERR(pages)) | |
3378 | ret = PTR_ERR(pages); | |
3379 | ||
3380 | ret = -ENOMEM; | |
3381 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 3382 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
3383 | if (!obj_request) |
3384 | goto out; | |
3385 | ||
3386 | obj_request->pages = pages; | |
3387 | obj_request->page_count = page_count; | |
3388 | ||
deb236b3 ID |
3389 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
3390 | obj_request); | |
788e2df3 AE |
3391 | if (!obj_request->osd_req) |
3392 | goto out; | |
3393 | ||
c99d2d4a AE |
3394 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
3395 | offset, length, 0, 0); | |
406e2c9f | 3396 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 3397 | obj_request->pages, |
44cd188d AE |
3398 | obj_request->length, |
3399 | obj_request->offset & ~PAGE_MASK, | |
3400 | false, false); | |
9d4df01f | 3401 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3402 | |
788e2df3 AE |
3403 | ret = rbd_obj_request_submit(osdc, obj_request); |
3404 | if (ret) | |
3405 | goto out; | |
3406 | ret = rbd_obj_request_wait(obj_request); | |
3407 | if (ret) | |
3408 | goto out; | |
3409 | ||
3410 | ret = obj_request->result; | |
3411 | if (ret < 0) | |
3412 | goto out; | |
1ceae7ef AE |
3413 | |
3414 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
3415 | size = (size_t) obj_request->xferred; | |
903bb32e | 3416 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
3417 | rbd_assert(size <= (size_t)INT_MAX); |
3418 | ret = (int)size; | |
788e2df3 AE |
3419 | out: |
3420 | if (obj_request) | |
3421 | rbd_obj_request_put(obj_request); | |
3422 | else | |
3423 | ceph_release_page_vector(pages, page_count); | |
3424 | ||
3425 | return ret; | |
3426 | } | |
3427 | ||
602adf40 | 3428 | /* |
662518b1 AE |
3429 | * Read the complete header for the given rbd device. On successful |
3430 | * return, the rbd_dev->header field will contain up-to-date | |
3431 | * information about the image. | |
602adf40 | 3432 | */ |
99a41ebc | 3433 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3434 | { |
4156d998 | 3435 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3436 | u32 snap_count = 0; |
4156d998 AE |
3437 | u64 names_size = 0; |
3438 | u32 want_count; | |
3439 | int ret; | |
602adf40 | 3440 | |
00f1f36f | 3441 | /* |
4156d998 AE |
3442 | * The complete header will include an array of its 64-bit |
3443 | * snapshot ids, followed by the names of those snapshots as | |
3444 | * a contiguous block of NUL-terminated strings. Note that | |
3445 | * the number of snapshots could change by the time we read | |
3446 | * it in, in which case we re-read it. | |
00f1f36f | 3447 | */ |
4156d998 AE |
3448 | do { |
3449 | size_t size; | |
3450 | ||
3451 | kfree(ondisk); | |
3452 | ||
3453 | size = sizeof (*ondisk); | |
3454 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3455 | size += names_size; | |
3456 | ondisk = kmalloc(size, GFP_KERNEL); | |
3457 | if (!ondisk) | |
662518b1 | 3458 | return -ENOMEM; |
4156d998 | 3459 | |
788e2df3 | 3460 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 3461 | 0, size, ondisk); |
4156d998 | 3462 | if (ret < 0) |
662518b1 | 3463 | goto out; |
c0cd10db | 3464 | if ((size_t)ret < size) { |
4156d998 | 3465 | ret = -ENXIO; |
06ecc6cb AE |
3466 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3467 | size, ret); | |
662518b1 | 3468 | goto out; |
4156d998 AE |
3469 | } |
3470 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3471 | ret = -ENXIO; | |
06ecc6cb | 3472 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3473 | goto out; |
81e759fb | 3474 | } |
602adf40 | 3475 | |
4156d998 AE |
3476 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3477 | want_count = snap_count; | |
3478 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3479 | } while (snap_count != want_count); | |
00f1f36f | 3480 | |
662518b1 AE |
3481 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3482 | out: | |
4156d998 AE |
3483 | kfree(ondisk); |
3484 | ||
3485 | return ret; | |
602adf40 YS |
3486 | } |
3487 | ||
15228ede AE |
3488 | /* |
3489 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3490 | * has disappeared from the (just updated) snapshot context. | |
3491 | */ | |
3492 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3493 | { | |
3494 | u64 snap_id; | |
3495 | ||
3496 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3497 | return; | |
3498 | ||
3499 | snap_id = rbd_dev->spec->snap_id; | |
3500 | if (snap_id == CEPH_NOSNAP) | |
3501 | return; | |
3502 | ||
3503 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3504 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3505 | } | |
3506 | ||
9875201e JD |
3507 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3508 | { | |
3509 | sector_t size; | |
3510 | bool removing; | |
3511 | ||
3512 | /* | |
3513 | * Don't hold the lock while doing disk operations, | |
3514 | * or lock ordering will conflict with the bdev mutex via: | |
3515 | * rbd_add() -> blkdev_get() -> rbd_open() | |
3516 | */ | |
3517 | spin_lock_irq(&rbd_dev->lock); | |
3518 | removing = test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
3519 | spin_unlock_irq(&rbd_dev->lock); | |
3520 | /* | |
3521 | * If the device is being removed, rbd_dev->disk has | |
3522 | * been destroyed, so don't try to update its size | |
3523 | */ | |
3524 | if (!removing) { | |
3525 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3526 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3527 | set_capacity(rbd_dev->disk, size); | |
3528 | revalidate_disk(rbd_dev->disk); | |
3529 | } | |
3530 | } | |
3531 | ||
cc4a38bd | 3532 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3533 | { |
e627db08 | 3534 | u64 mapping_size; |
1fe5e993 AE |
3535 | int ret; |
3536 | ||
117973fb | 3537 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
cfbf6377 | 3538 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3539 | mapping_size = rbd_dev->mapping.size; |
117973fb | 3540 | if (rbd_dev->image_format == 1) |
99a41ebc | 3541 | ret = rbd_dev_v1_header_info(rbd_dev); |
117973fb | 3542 | else |
2df3fac7 | 3543 | ret = rbd_dev_v2_header_info(rbd_dev); |
15228ede AE |
3544 | |
3545 | /* If it's a mapped snapshot, validate its EXISTS flag */ | |
3546 | ||
3547 | rbd_exists_validate(rbd_dev); | |
cfbf6377 AE |
3548 | up_write(&rbd_dev->header_rwsem); |
3549 | ||
00a653e2 | 3550 | if (mapping_size != rbd_dev->mapping.size) { |
9875201e | 3551 | rbd_dev_update_size(rbd_dev); |
00a653e2 | 3552 | } |
1fe5e993 AE |
3553 | |
3554 | return ret; | |
3555 | } | |
3556 | ||
602adf40 YS |
3557 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3558 | { | |
3559 | struct gendisk *disk; | |
3560 | struct request_queue *q; | |
593a9e7b | 3561 | u64 segment_size; |
602adf40 | 3562 | |
602adf40 | 3563 | /* create gendisk info */ |
7e513d43 ID |
3564 | disk = alloc_disk(single_major ? |
3565 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3566 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3567 | if (!disk) |
1fcdb8aa | 3568 | return -ENOMEM; |
602adf40 | 3569 | |
f0f8cef5 | 3570 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3571 | rbd_dev->dev_id); |
602adf40 | 3572 | disk->major = rbd_dev->major; |
dd82fff1 | 3573 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3574 | if (single_major) |
3575 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3576 | disk->fops = &rbd_bd_ops; |
3577 | disk->private_data = rbd_dev; | |
3578 | ||
bf0d5f50 | 3579 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3580 | if (!q) |
3581 | goto out_disk; | |
029bcbd8 | 3582 | |
593a9e7b AE |
3583 | /* We use the default size, but let's be explicit about it. */ |
3584 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3585 | ||
029bcbd8 | 3586 | /* set io sizes to object size */ |
593a9e7b AE |
3587 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3588 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3589 | blk_queue_max_segment_size(q, segment_size); | |
3590 | blk_queue_io_min(q, segment_size); | |
3591 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3592 | |
602adf40 YS |
3593 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3594 | disk->queue = q; | |
3595 | ||
3596 | q->queuedata = rbd_dev; | |
3597 | ||
3598 | rbd_dev->disk = disk; | |
602adf40 | 3599 | |
602adf40 | 3600 | return 0; |
602adf40 YS |
3601 | out_disk: |
3602 | put_disk(disk); | |
1fcdb8aa AE |
3603 | |
3604 | return -ENOMEM; | |
602adf40 YS |
3605 | } |
3606 | ||
dfc5606d YS |
3607 | /* |
3608 | sysfs | |
3609 | */ | |
3610 | ||
593a9e7b AE |
3611 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3612 | { | |
3613 | return container_of(dev, struct rbd_device, dev); | |
3614 | } | |
3615 | ||
dfc5606d YS |
3616 | static ssize_t rbd_size_show(struct device *dev, |
3617 | struct device_attribute *attr, char *buf) | |
3618 | { | |
593a9e7b | 3619 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3620 | |
fc71d833 AE |
3621 | return sprintf(buf, "%llu\n", |
3622 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3623 | } |
3624 | ||
34b13184 AE |
3625 | /* |
3626 | * Note this shows the features for whatever's mapped, which is not | |
3627 | * necessarily the base image. | |
3628 | */ | |
3629 | static ssize_t rbd_features_show(struct device *dev, | |
3630 | struct device_attribute *attr, char *buf) | |
3631 | { | |
3632 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3633 | ||
3634 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3635 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3636 | } |
3637 | ||
dfc5606d YS |
3638 | static ssize_t rbd_major_show(struct device *dev, |
3639 | struct device_attribute *attr, char *buf) | |
3640 | { | |
593a9e7b | 3641 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3642 | |
fc71d833 AE |
3643 | if (rbd_dev->major) |
3644 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3645 | ||
3646 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
3647 | } |
3648 | ||
3649 | static ssize_t rbd_minor_show(struct device *dev, | |
3650 | struct device_attribute *attr, char *buf) | |
3651 | { | |
3652 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 3653 | |
dd82fff1 | 3654 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
3655 | } |
3656 | ||
3657 | static ssize_t rbd_client_id_show(struct device *dev, | |
3658 | struct device_attribute *attr, char *buf) | |
602adf40 | 3659 | { |
593a9e7b | 3660 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3661 | |
1dbb4399 AE |
3662 | return sprintf(buf, "client%lld\n", |
3663 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3664 | } |
3665 | ||
dfc5606d YS |
3666 | static ssize_t rbd_pool_show(struct device *dev, |
3667 | struct device_attribute *attr, char *buf) | |
602adf40 | 3668 | { |
593a9e7b | 3669 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3670 | |
0d7dbfce | 3671 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3672 | } |
3673 | ||
9bb2f334 AE |
3674 | static ssize_t rbd_pool_id_show(struct device *dev, |
3675 | struct device_attribute *attr, char *buf) | |
3676 | { | |
3677 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3678 | ||
0d7dbfce | 3679 | return sprintf(buf, "%llu\n", |
fc71d833 | 3680 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3681 | } |
3682 | ||
dfc5606d YS |
3683 | static ssize_t rbd_name_show(struct device *dev, |
3684 | struct device_attribute *attr, char *buf) | |
3685 | { | |
593a9e7b | 3686 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3687 | |
a92ffdf8 AE |
3688 | if (rbd_dev->spec->image_name) |
3689 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3690 | ||
3691 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3692 | } |
3693 | ||
589d30e0 AE |
3694 | static ssize_t rbd_image_id_show(struct device *dev, |
3695 | struct device_attribute *attr, char *buf) | |
3696 | { | |
3697 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3698 | ||
0d7dbfce | 3699 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3700 | } |
3701 | ||
34b13184 AE |
3702 | /* |
3703 | * Shows the name of the currently-mapped snapshot (or | |
3704 | * RBD_SNAP_HEAD_NAME for the base image). | |
3705 | */ | |
dfc5606d YS |
3706 | static ssize_t rbd_snap_show(struct device *dev, |
3707 | struct device_attribute *attr, | |
3708 | char *buf) | |
3709 | { | |
593a9e7b | 3710 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3711 | |
0d7dbfce | 3712 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3713 | } |
3714 | ||
86b00e0d AE |
3715 | /* |
3716 | * For an rbd v2 image, shows the pool id, image id, and snapshot id | |
3717 | * for the parent image. If there is no parent, simply shows | |
3718 | * "(no parent image)". | |
3719 | */ | |
3720 | static ssize_t rbd_parent_show(struct device *dev, | |
3721 | struct device_attribute *attr, | |
3722 | char *buf) | |
3723 | { | |
3724 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3725 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3726 | int count; | |
3727 | char *bufp = buf; | |
3728 | ||
3729 | if (!spec) | |
3730 | return sprintf(buf, "(no parent image)\n"); | |
3731 | ||
3732 | count = sprintf(bufp, "pool_id %llu\npool_name %s\n", | |
3733 | (unsigned long long) spec->pool_id, spec->pool_name); | |
3734 | if (count < 0) | |
3735 | return count; | |
3736 | bufp += count; | |
3737 | ||
3738 | count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, | |
3739 | spec->image_name ? spec->image_name : "(unknown)"); | |
3740 | if (count < 0) | |
3741 | return count; | |
3742 | bufp += count; | |
3743 | ||
3744 | count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", | |
3745 | (unsigned long long) spec->snap_id, spec->snap_name); | |
3746 | if (count < 0) | |
3747 | return count; | |
3748 | bufp += count; | |
3749 | ||
3750 | count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); | |
3751 | if (count < 0) | |
3752 | return count; | |
3753 | bufp += count; | |
3754 | ||
3755 | return (ssize_t) (bufp - buf); | |
3756 | } | |
3757 | ||
dfc5606d YS |
3758 | static ssize_t rbd_image_refresh(struct device *dev, |
3759 | struct device_attribute *attr, | |
3760 | const char *buf, | |
3761 | size_t size) | |
3762 | { | |
593a9e7b | 3763 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3764 | int ret; |
602adf40 | 3765 | |
cc4a38bd | 3766 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 AE |
3767 | if (ret) |
3768 | rbd_warn(rbd_dev, ": manual header refresh error (%d)\n", ret); | |
b813623a AE |
3769 | |
3770 | return ret < 0 ? ret : size; | |
dfc5606d | 3771 | } |
602adf40 | 3772 | |
dfc5606d | 3773 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3774 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 3775 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 3776 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
dfc5606d YS |
3777 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
3778 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3779 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3780 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3781 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3782 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3783 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3784 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3785 | |
3786 | static struct attribute *rbd_attrs[] = { | |
3787 | &dev_attr_size.attr, | |
34b13184 | 3788 | &dev_attr_features.attr, |
dfc5606d | 3789 | &dev_attr_major.attr, |
dd82fff1 | 3790 | &dev_attr_minor.attr, |
dfc5606d YS |
3791 | &dev_attr_client_id.attr, |
3792 | &dev_attr_pool.attr, | |
9bb2f334 | 3793 | &dev_attr_pool_id.attr, |
dfc5606d | 3794 | &dev_attr_name.attr, |
589d30e0 | 3795 | &dev_attr_image_id.attr, |
dfc5606d | 3796 | &dev_attr_current_snap.attr, |
86b00e0d | 3797 | &dev_attr_parent.attr, |
dfc5606d | 3798 | &dev_attr_refresh.attr, |
dfc5606d YS |
3799 | NULL |
3800 | }; | |
3801 | ||
3802 | static struct attribute_group rbd_attr_group = { | |
3803 | .attrs = rbd_attrs, | |
3804 | }; | |
3805 | ||
3806 | static const struct attribute_group *rbd_attr_groups[] = { | |
3807 | &rbd_attr_group, | |
3808 | NULL | |
3809 | }; | |
3810 | ||
3811 | static void rbd_sysfs_dev_release(struct device *dev) | |
3812 | { | |
3813 | } | |
3814 | ||
3815 | static struct device_type rbd_device_type = { | |
3816 | .name = "rbd", | |
3817 | .groups = rbd_attr_groups, | |
3818 | .release = rbd_sysfs_dev_release, | |
3819 | }; | |
3820 | ||
8b8fb99c AE |
3821 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3822 | { | |
3823 | kref_get(&spec->kref); | |
3824 | ||
3825 | return spec; | |
3826 | } | |
3827 | ||
3828 | static void rbd_spec_free(struct kref *kref); | |
3829 | static void rbd_spec_put(struct rbd_spec *spec) | |
3830 | { | |
3831 | if (spec) | |
3832 | kref_put(&spec->kref, rbd_spec_free); | |
3833 | } | |
3834 | ||
3835 | static struct rbd_spec *rbd_spec_alloc(void) | |
3836 | { | |
3837 | struct rbd_spec *spec; | |
3838 | ||
3839 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3840 | if (!spec) | |
3841 | return NULL; | |
3842 | kref_init(&spec->kref); | |
3843 | ||
8b8fb99c AE |
3844 | return spec; |
3845 | } | |
3846 | ||
3847 | static void rbd_spec_free(struct kref *kref) | |
3848 | { | |
3849 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3850 | ||
3851 | kfree(spec->pool_name); | |
3852 | kfree(spec->image_id); | |
3853 | kfree(spec->image_name); | |
3854 | kfree(spec->snap_name); | |
3855 | kfree(spec); | |
3856 | } | |
3857 | ||
cc344fa1 | 3858 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3859 | struct rbd_spec *spec) |
3860 | { | |
3861 | struct rbd_device *rbd_dev; | |
3862 | ||
3863 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3864 | if (!rbd_dev) | |
3865 | return NULL; | |
3866 | ||
3867 | spin_lock_init(&rbd_dev->lock); | |
6d292906 | 3868 | rbd_dev->flags = 0; |
a2acd00e | 3869 | atomic_set(&rbd_dev->parent_ref, 0); |
c53d5893 | 3870 | INIT_LIST_HEAD(&rbd_dev->node); |
c53d5893 AE |
3871 | init_rwsem(&rbd_dev->header_rwsem); |
3872 | ||
3873 | rbd_dev->spec = spec; | |
3874 | rbd_dev->rbd_client = rbdc; | |
3875 | ||
0903e875 AE |
3876 | /* Initialize the layout used for all rbd requests */ |
3877 | ||
3878 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3879 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3880 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3881 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3882 | ||
c53d5893 AE |
3883 | return rbd_dev; |
3884 | } | |
3885 | ||
3886 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3887 | { | |
c53d5893 AE |
3888 | rbd_put_client(rbd_dev->rbd_client); |
3889 | rbd_spec_put(rbd_dev->spec); | |
3890 | kfree(rbd_dev); | |
3891 | } | |
3892 | ||
9d475de5 AE |
3893 | /* |
3894 | * Get the size and object order for an image snapshot, or if | |
3895 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3896 | * image. | |
3897 | */ | |
3898 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3899 | u8 *order, u64 *snap_size) | |
3900 | { | |
3901 | __le64 snapid = cpu_to_le64(snap_id); | |
3902 | int ret; | |
3903 | struct { | |
3904 | u8 order; | |
3905 | __le64 size; | |
3906 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3907 | ||
36be9a76 | 3908 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3909 | "rbd", "get_size", |
4157976b | 3910 | &snapid, sizeof (snapid), |
e2a58ee5 | 3911 | &size_buf, sizeof (size_buf)); |
36be9a76 | 3912 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3913 | if (ret < 0) |
3914 | return ret; | |
57385b51 AE |
3915 | if (ret < sizeof (size_buf)) |
3916 | return -ERANGE; | |
9d475de5 | 3917 | |
c3545579 | 3918 | if (order) { |
c86f86e9 | 3919 | *order = size_buf.order; |
c3545579 JD |
3920 | dout(" order %u", (unsigned int)*order); |
3921 | } | |
9d475de5 AE |
3922 | *snap_size = le64_to_cpu(size_buf.size); |
3923 | ||
c3545579 JD |
3924 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
3925 | (unsigned long long)snap_id, | |
57385b51 | 3926 | (unsigned long long)*snap_size); |
9d475de5 AE |
3927 | |
3928 | return 0; | |
3929 | } | |
3930 | ||
3931 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3932 | { | |
3933 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3934 | &rbd_dev->header.obj_order, | |
3935 | &rbd_dev->header.image_size); | |
3936 | } | |
3937 | ||
1e130199 AE |
3938 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3939 | { | |
3940 | void *reply_buf; | |
3941 | int ret; | |
3942 | void *p; | |
3943 | ||
3944 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, 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_object_prefix", NULL, 0, |
e2a58ee5 | 3950 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 3951 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3952 | if (ret < 0) |
3953 | goto out; | |
3954 | ||
3955 | p = reply_buf; | |
3956 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3957 | p + ret, NULL, GFP_NOIO); |
3958 | ret = 0; | |
1e130199 AE |
3959 | |
3960 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3961 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3962 | rbd_dev->header.object_prefix = NULL; | |
3963 | } else { | |
3964 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3965 | } | |
1e130199 AE |
3966 | out: |
3967 | kfree(reply_buf); | |
3968 | ||
3969 | return ret; | |
3970 | } | |
3971 | ||
b1b5402a AE |
3972 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3973 | u64 *snap_features) | |
3974 | { | |
3975 | __le64 snapid = cpu_to_le64(snap_id); | |
3976 | struct { | |
3977 | __le64 features; | |
3978 | __le64 incompat; | |
4157976b | 3979 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 3980 | u64 incompat; |
b1b5402a AE |
3981 | int ret; |
3982 | ||
36be9a76 | 3983 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 3984 | "rbd", "get_features", |
4157976b | 3985 | &snapid, sizeof (snapid), |
e2a58ee5 | 3986 | &features_buf, sizeof (features_buf)); |
36be9a76 | 3987 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
3988 | if (ret < 0) |
3989 | return ret; | |
57385b51 AE |
3990 | if (ret < sizeof (features_buf)) |
3991 | return -ERANGE; | |
d889140c AE |
3992 | |
3993 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 3994 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 3995 | return -ENXIO; |
d889140c | 3996 | |
b1b5402a AE |
3997 | *snap_features = le64_to_cpu(features_buf.features); |
3998 | ||
3999 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4000 | (unsigned long long)snap_id, |
4001 | (unsigned long long)*snap_features, | |
4002 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4003 | |
4004 | return 0; | |
4005 | } | |
4006 | ||
4007 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4008 | { | |
4009 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4010 | &rbd_dev->header.features); | |
4011 | } | |
4012 | ||
86b00e0d AE |
4013 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4014 | { | |
4015 | struct rbd_spec *parent_spec; | |
4016 | size_t size; | |
4017 | void *reply_buf = NULL; | |
4018 | __le64 snapid; | |
4019 | void *p; | |
4020 | void *end; | |
642a2537 | 4021 | u64 pool_id; |
86b00e0d | 4022 | char *image_id; |
3b5cf2a2 | 4023 | u64 snap_id; |
86b00e0d | 4024 | u64 overlap; |
86b00e0d AE |
4025 | int ret; |
4026 | ||
4027 | parent_spec = rbd_spec_alloc(); | |
4028 | if (!parent_spec) | |
4029 | return -ENOMEM; | |
4030 | ||
4031 | size = sizeof (__le64) + /* pool_id */ | |
4032 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4033 | sizeof (__le64) + /* snap_id */ | |
4034 | sizeof (__le64); /* overlap */ | |
4035 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4036 | if (!reply_buf) { | |
4037 | ret = -ENOMEM; | |
4038 | goto out_err; | |
4039 | } | |
4040 | ||
4041 | snapid = cpu_to_le64(CEPH_NOSNAP); | |
36be9a76 | 4042 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 4043 | "rbd", "get_parent", |
4157976b | 4044 | &snapid, sizeof (snapid), |
e2a58ee5 | 4045 | reply_buf, size); |
36be9a76 | 4046 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4047 | if (ret < 0) |
4048 | goto out_err; | |
4049 | ||
86b00e0d | 4050 | p = reply_buf; |
57385b51 AE |
4051 | end = reply_buf + ret; |
4052 | ret = -ERANGE; | |
642a2537 | 4053 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4054 | if (pool_id == CEPH_NOPOOL) { |
4055 | /* | |
4056 | * Either the parent never existed, or we have | |
4057 | * record of it but the image got flattened so it no | |
4058 | * longer has a parent. When the parent of a | |
4059 | * layered image disappears we immediately set the | |
4060 | * overlap to 0. The effect of this is that all new | |
4061 | * requests will be treated as if the image had no | |
4062 | * parent. | |
4063 | */ | |
4064 | if (rbd_dev->parent_overlap) { | |
4065 | rbd_dev->parent_overlap = 0; | |
4066 | smp_mb(); | |
4067 | rbd_dev_parent_put(rbd_dev); | |
4068 | pr_info("%s: clone image has been flattened\n", | |
4069 | rbd_dev->disk->disk_name); | |
4070 | } | |
4071 | ||
86b00e0d | 4072 | goto out; /* No parent? No problem. */ |
392a9dad | 4073 | } |
86b00e0d | 4074 | |
0903e875 AE |
4075 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4076 | ||
4077 | ret = -EIO; | |
642a2537 | 4078 | if (pool_id > (u64)U32_MAX) { |
c0cd10db | 4079 | rbd_warn(NULL, "parent pool id too large (%llu > %u)\n", |
642a2537 | 4080 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4081 | goto out_err; |
c0cd10db | 4082 | } |
0903e875 | 4083 | |
979ed480 | 4084 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4085 | if (IS_ERR(image_id)) { |
4086 | ret = PTR_ERR(image_id); | |
4087 | goto out_err; | |
4088 | } | |
3b5cf2a2 | 4089 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4090 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4091 | ||
3b5cf2a2 AE |
4092 | /* |
4093 | * The parent won't change (except when the clone is | |
4094 | * flattened, already handled that). So we only need to | |
4095 | * record the parent spec we have not already done so. | |
4096 | */ | |
4097 | if (!rbd_dev->parent_spec) { | |
4098 | parent_spec->pool_id = pool_id; | |
4099 | parent_spec->image_id = image_id; | |
4100 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4101 | rbd_dev->parent_spec = parent_spec; |
4102 | parent_spec = NULL; /* rbd_dev now owns this */ | |
3b5cf2a2 AE |
4103 | } |
4104 | ||
4105 | /* | |
4106 | * We always update the parent overlap. If it's zero we | |
4107 | * treat it specially. | |
4108 | */ | |
4109 | rbd_dev->parent_overlap = overlap; | |
4110 | smp_mb(); | |
4111 | if (!overlap) { | |
4112 | ||
4113 | /* A null parent_spec indicates it's the initial probe */ | |
4114 | ||
4115 | if (parent_spec) { | |
4116 | /* | |
4117 | * The overlap has become zero, so the clone | |
4118 | * must have been resized down to 0 at some | |
4119 | * point. Treat this the same as a flatten. | |
4120 | */ | |
4121 | rbd_dev_parent_put(rbd_dev); | |
4122 | pr_info("%s: clone image now standalone\n", | |
4123 | rbd_dev->disk->disk_name); | |
4124 | } else { | |
4125 | /* | |
4126 | * For the initial probe, if we find the | |
4127 | * overlap is zero we just pretend there was | |
4128 | * no parent image. | |
4129 | */ | |
4130 | rbd_warn(rbd_dev, "ignoring parent of " | |
4131 | "clone with overlap 0\n"); | |
4132 | } | |
70cf49cf | 4133 | } |
86b00e0d AE |
4134 | out: |
4135 | ret = 0; | |
4136 | out_err: | |
4137 | kfree(reply_buf); | |
4138 | rbd_spec_put(parent_spec); | |
4139 | ||
4140 | return ret; | |
4141 | } | |
4142 | ||
cc070d59 AE |
4143 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4144 | { | |
4145 | struct { | |
4146 | __le64 stripe_unit; | |
4147 | __le64 stripe_count; | |
4148 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4149 | size_t size = sizeof (striping_info_buf); | |
4150 | void *p; | |
4151 | u64 obj_size; | |
4152 | u64 stripe_unit; | |
4153 | u64 stripe_count; | |
4154 | int ret; | |
4155 | ||
4156 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
4157 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 4158 | (char *)&striping_info_buf, size); |
cc070d59 AE |
4159 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4160 | if (ret < 0) | |
4161 | return ret; | |
4162 | if (ret < size) | |
4163 | return -ERANGE; | |
4164 | ||
4165 | /* | |
4166 | * We don't actually support the "fancy striping" feature | |
4167 | * (STRIPINGV2) yet, but if the striping sizes are the | |
4168 | * defaults the behavior is the same as before. So find | |
4169 | * out, and only fail if the image has non-default values. | |
4170 | */ | |
4171 | ret = -EINVAL; | |
4172 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
4173 | p = &striping_info_buf; | |
4174 | stripe_unit = ceph_decode_64(&p); | |
4175 | if (stripe_unit != obj_size) { | |
4176 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
4177 | "(got %llu want %llu)", | |
4178 | stripe_unit, obj_size); | |
4179 | return -EINVAL; | |
4180 | } | |
4181 | stripe_count = ceph_decode_64(&p); | |
4182 | if (stripe_count != 1) { | |
4183 | rbd_warn(rbd_dev, "unsupported stripe count " | |
4184 | "(got %llu want 1)", stripe_count); | |
4185 | return -EINVAL; | |
4186 | } | |
500d0c0f AE |
4187 | rbd_dev->header.stripe_unit = stripe_unit; |
4188 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
4189 | |
4190 | return 0; | |
4191 | } | |
4192 | ||
9e15b77d AE |
4193 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4194 | { | |
4195 | size_t image_id_size; | |
4196 | char *image_id; | |
4197 | void *p; | |
4198 | void *end; | |
4199 | size_t size; | |
4200 | void *reply_buf = NULL; | |
4201 | size_t len = 0; | |
4202 | char *image_name = NULL; | |
4203 | int ret; | |
4204 | ||
4205 | rbd_assert(!rbd_dev->spec->image_name); | |
4206 | ||
69e7a02f AE |
4207 | len = strlen(rbd_dev->spec->image_id); |
4208 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4209 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4210 | if (!image_id) | |
4211 | return NULL; | |
4212 | ||
4213 | p = image_id; | |
4157976b | 4214 | end = image_id + image_id_size; |
57385b51 | 4215 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4216 | |
4217 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4218 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4219 | if (!reply_buf) | |
4220 | goto out; | |
4221 | ||
36be9a76 | 4222 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
4223 | "rbd", "dir_get_name", |
4224 | image_id, image_id_size, | |
e2a58ee5 | 4225 | reply_buf, size); |
9e15b77d AE |
4226 | if (ret < 0) |
4227 | goto out; | |
4228 | p = reply_buf; | |
f40eb349 AE |
4229 | end = reply_buf + ret; |
4230 | ||
9e15b77d AE |
4231 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4232 | if (IS_ERR(image_name)) | |
4233 | image_name = NULL; | |
4234 | else | |
4235 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4236 | out: | |
4237 | kfree(reply_buf); | |
4238 | kfree(image_id); | |
4239 | ||
4240 | return image_name; | |
4241 | } | |
4242 | ||
2ad3d716 AE |
4243 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4244 | { | |
4245 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4246 | const char *snap_name; | |
4247 | u32 which = 0; | |
4248 | ||
4249 | /* Skip over names until we find the one we are looking for */ | |
4250 | ||
4251 | snap_name = rbd_dev->header.snap_names; | |
4252 | while (which < snapc->num_snaps) { | |
4253 | if (!strcmp(name, snap_name)) | |
4254 | return snapc->snaps[which]; | |
4255 | snap_name += strlen(snap_name) + 1; | |
4256 | which++; | |
4257 | } | |
4258 | return CEPH_NOSNAP; | |
4259 | } | |
4260 | ||
4261 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4262 | { | |
4263 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4264 | u32 which; | |
4265 | bool found = false; | |
4266 | u64 snap_id; | |
4267 | ||
4268 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4269 | const char *snap_name; | |
4270 | ||
4271 | snap_id = snapc->snaps[which]; | |
4272 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4273 | if (IS_ERR(snap_name)) { |
4274 | /* ignore no-longer existing snapshots */ | |
4275 | if (PTR_ERR(snap_name) == -ENOENT) | |
4276 | continue; | |
4277 | else | |
4278 | break; | |
4279 | } | |
2ad3d716 AE |
4280 | found = !strcmp(name, snap_name); |
4281 | kfree(snap_name); | |
4282 | } | |
4283 | return found ? snap_id : CEPH_NOSNAP; | |
4284 | } | |
4285 | ||
4286 | /* | |
4287 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4288 | * no snapshot by that name is found, or if an error occurs. | |
4289 | */ | |
4290 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4291 | { | |
4292 | if (rbd_dev->image_format == 1) | |
4293 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4294 | ||
4295 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4296 | } | |
4297 | ||
9e15b77d | 4298 | /* |
2e9f7f1c AE |
4299 | * When an rbd image has a parent image, it is identified by the |
4300 | * pool, image, and snapshot ids (not names). This function fills | |
4301 | * in the names for those ids. (It's OK if we can't figure out the | |
4302 | * name for an image id, but the pool and snapshot ids should always | |
4303 | * exist and have names.) All names in an rbd spec are dynamically | |
4304 | * allocated. | |
e1d4213f AE |
4305 | * |
4306 | * When an image being mapped (not a parent) is probed, we have the | |
4307 | * pool name and pool id, image name and image id, and the snapshot | |
4308 | * name. The only thing we're missing is the snapshot id. | |
9e15b77d | 4309 | */ |
2e9f7f1c | 4310 | static int rbd_dev_spec_update(struct rbd_device *rbd_dev) |
9e15b77d | 4311 | { |
2e9f7f1c AE |
4312 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4313 | struct rbd_spec *spec = rbd_dev->spec; | |
4314 | const char *pool_name; | |
4315 | const char *image_name; | |
4316 | const char *snap_name; | |
9e15b77d AE |
4317 | int ret; |
4318 | ||
e1d4213f AE |
4319 | /* |
4320 | * An image being mapped will have the pool name (etc.), but | |
4321 | * we need to look up the snapshot id. | |
4322 | */ | |
2e9f7f1c AE |
4323 | if (spec->pool_name) { |
4324 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
2ad3d716 | 4325 | u64 snap_id; |
e1d4213f | 4326 | |
2ad3d716 AE |
4327 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
4328 | if (snap_id == CEPH_NOSNAP) | |
e1d4213f | 4329 | return -ENOENT; |
2ad3d716 | 4330 | spec->snap_id = snap_id; |
e1d4213f | 4331 | } else { |
2e9f7f1c | 4332 | spec->snap_id = CEPH_NOSNAP; |
e1d4213f AE |
4333 | } |
4334 | ||
4335 | return 0; | |
4336 | } | |
9e15b77d | 4337 | |
2e9f7f1c | 4338 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4339 | |
2e9f7f1c AE |
4340 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4341 | if (!pool_name) { | |
4342 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4343 | return -EIO; |
4344 | } | |
2e9f7f1c AE |
4345 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4346 | if (!pool_name) | |
9e15b77d AE |
4347 | return -ENOMEM; |
4348 | ||
4349 | /* Fetch the image name; tolerate failure here */ | |
4350 | ||
2e9f7f1c AE |
4351 | image_name = rbd_dev_image_name(rbd_dev); |
4352 | if (!image_name) | |
06ecc6cb | 4353 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4354 | |
2e9f7f1c | 4355 | /* Look up the snapshot name, and make a copy */ |
9e15b77d | 4356 | |
2e9f7f1c | 4357 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4358 | if (IS_ERR(snap_name)) { |
4359 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4360 | goto out_err; |
2e9f7f1c AE |
4361 | } |
4362 | ||
4363 | spec->pool_name = pool_name; | |
4364 | spec->image_name = image_name; | |
4365 | spec->snap_name = snap_name; | |
9e15b77d AE |
4366 | |
4367 | return 0; | |
4368 | out_err: | |
2e9f7f1c AE |
4369 | kfree(image_name); |
4370 | kfree(pool_name); | |
9e15b77d AE |
4371 | |
4372 | return ret; | |
4373 | } | |
4374 | ||
cc4a38bd | 4375 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4376 | { |
4377 | size_t size; | |
4378 | int ret; | |
4379 | void *reply_buf; | |
4380 | void *p; | |
4381 | void *end; | |
4382 | u64 seq; | |
4383 | u32 snap_count; | |
4384 | struct ceph_snap_context *snapc; | |
4385 | u32 i; | |
4386 | ||
4387 | /* | |
4388 | * We'll need room for the seq value (maximum snapshot id), | |
4389 | * snapshot count, and array of that many snapshot ids. | |
4390 | * For now we have a fixed upper limit on the number we're | |
4391 | * prepared to receive. | |
4392 | */ | |
4393 | size = sizeof (__le64) + sizeof (__le32) + | |
4394 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4395 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4396 | if (!reply_buf) | |
4397 | return -ENOMEM; | |
4398 | ||
36be9a76 | 4399 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 4400 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 4401 | reply_buf, size); |
36be9a76 | 4402 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4403 | if (ret < 0) |
4404 | goto out; | |
4405 | ||
35d489f9 | 4406 | p = reply_buf; |
57385b51 AE |
4407 | end = reply_buf + ret; |
4408 | ret = -ERANGE; | |
35d489f9 AE |
4409 | ceph_decode_64_safe(&p, end, seq, out); |
4410 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4411 | ||
4412 | /* | |
4413 | * Make sure the reported number of snapshot ids wouldn't go | |
4414 | * beyond the end of our buffer. But before checking that, | |
4415 | * make sure the computed size of the snapshot context we | |
4416 | * allocate is representable in a size_t. | |
4417 | */ | |
4418 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4419 | / sizeof (u64)) { | |
4420 | ret = -EINVAL; | |
4421 | goto out; | |
4422 | } | |
4423 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4424 | goto out; | |
468521c1 | 4425 | ret = 0; |
35d489f9 | 4426 | |
812164f8 | 4427 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4428 | if (!snapc) { |
4429 | ret = -ENOMEM; | |
4430 | goto out; | |
4431 | } | |
35d489f9 | 4432 | snapc->seq = seq; |
35d489f9 AE |
4433 | for (i = 0; i < snap_count; i++) |
4434 | snapc->snaps[i] = ceph_decode_64(&p); | |
4435 | ||
49ece554 | 4436 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4437 | rbd_dev->header.snapc = snapc; |
4438 | ||
4439 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4440 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4441 | out: |
4442 | kfree(reply_buf); | |
4443 | ||
57385b51 | 4444 | return ret; |
35d489f9 AE |
4445 | } |
4446 | ||
54cac61f AE |
4447 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4448 | u64 snap_id) | |
b8b1e2db AE |
4449 | { |
4450 | size_t size; | |
4451 | void *reply_buf; | |
54cac61f | 4452 | __le64 snapid; |
b8b1e2db AE |
4453 | int ret; |
4454 | void *p; | |
4455 | void *end; | |
b8b1e2db AE |
4456 | char *snap_name; |
4457 | ||
4458 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4459 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4460 | if (!reply_buf) | |
4461 | return ERR_PTR(-ENOMEM); | |
4462 | ||
54cac61f | 4463 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 4464 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 4465 | "rbd", "get_snapshot_name", |
54cac61f | 4466 | &snapid, sizeof (snapid), |
e2a58ee5 | 4467 | reply_buf, size); |
36be9a76 | 4468 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4469 | if (ret < 0) { |
4470 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4471 | goto out; |
f40eb349 | 4472 | } |
b8b1e2db AE |
4473 | |
4474 | p = reply_buf; | |
f40eb349 | 4475 | end = reply_buf + ret; |
e5c35534 | 4476 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4477 | if (IS_ERR(snap_name)) |
b8b1e2db | 4478 | goto out; |
b8b1e2db | 4479 | |
f40eb349 | 4480 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4481 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4482 | out: |
4483 | kfree(reply_buf); | |
4484 | ||
f40eb349 | 4485 | return snap_name; |
b8b1e2db AE |
4486 | } |
4487 | ||
2df3fac7 | 4488 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4489 | { |
2df3fac7 | 4490 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4491 | int ret; |
117973fb | 4492 | |
1617e40c JD |
4493 | ret = rbd_dev_v2_image_size(rbd_dev); |
4494 | if (ret) | |
cfbf6377 | 4495 | return ret; |
1617e40c | 4496 | |
2df3fac7 AE |
4497 | if (first_time) { |
4498 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
4499 | if (ret) | |
cfbf6377 | 4500 | return ret; |
2df3fac7 AE |
4501 | } |
4502 | ||
642a2537 AE |
4503 | /* |
4504 | * If the image supports layering, get the parent info. We | |
4505 | * need to probe the first time regardless. Thereafter we | |
4506 | * only need to if there's a parent, to see if it has | |
4507 | * disappeared due to the mapped image getting flattened. | |
4508 | */ | |
4509 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING && | |
4510 | (first_time || rbd_dev->parent_spec)) { | |
4511 | bool warn; | |
4512 | ||
4513 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
4514 | if (ret) | |
cfbf6377 | 4515 | return ret; |
642a2537 AE |
4516 | |
4517 | /* | |
4518 | * Print a warning if this is the initial probe and | |
4519 | * the image has a parent. Don't print it if the | |
4520 | * image now being probed is itself a parent. We | |
4521 | * can tell at this point because we won't know its | |
4522 | * pool name yet (just its pool id). | |
4523 | */ | |
4524 | warn = rbd_dev->parent_spec && rbd_dev->spec->pool_name; | |
4525 | if (first_time && warn) | |
4526 | rbd_warn(rbd_dev, "WARNING: kernel layering " | |
4527 | "is EXPERIMENTAL!"); | |
4528 | } | |
4529 | ||
29334ba4 AE |
4530 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) |
4531 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) | |
4532 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
117973fb | 4533 | |
cc4a38bd | 4534 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb | 4535 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
117973fb AE |
4536 | |
4537 | return ret; | |
4538 | } | |
4539 | ||
dfc5606d YS |
4540 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4541 | { | |
dfc5606d | 4542 | struct device *dev; |
cd789ab9 | 4543 | int ret; |
dfc5606d | 4544 | |
cd789ab9 | 4545 | dev = &rbd_dev->dev; |
dfc5606d YS |
4546 | dev->bus = &rbd_bus_type; |
4547 | dev->type = &rbd_device_type; | |
4548 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4549 | dev->release = rbd_dev_device_release; |
de71a297 | 4550 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4551 | ret = device_register(dev); |
dfc5606d | 4552 | |
dfc5606d | 4553 | return ret; |
602adf40 YS |
4554 | } |
4555 | ||
dfc5606d YS |
4556 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4557 | { | |
4558 | device_unregister(&rbd_dev->dev); | |
4559 | } | |
4560 | ||
1ddbe94e | 4561 | /* |
499afd5b | 4562 | * Get a unique rbd identifier for the given new rbd_dev, and add |
f8a22fc2 | 4563 | * the rbd_dev to the global list. |
1ddbe94e | 4564 | */ |
f8a22fc2 | 4565 | static int rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4566 | { |
f8a22fc2 ID |
4567 | int new_dev_id; |
4568 | ||
9b60e70b ID |
4569 | new_dev_id = ida_simple_get(&rbd_dev_id_ida, |
4570 | 0, minor_to_rbd_dev_id(1 << MINORBITS), | |
4571 | GFP_KERNEL); | |
f8a22fc2 ID |
4572 | if (new_dev_id < 0) |
4573 | return new_dev_id; | |
4574 | ||
4575 | rbd_dev->dev_id = new_dev_id; | |
499afd5b AE |
4576 | |
4577 | spin_lock(&rbd_dev_list_lock); | |
4578 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4579 | spin_unlock(&rbd_dev_list_lock); | |
f8a22fc2 | 4580 | |
70eebd20 | 4581 | dout("rbd_dev %p given dev id %d\n", rbd_dev, rbd_dev->dev_id); |
f8a22fc2 ID |
4582 | |
4583 | return 0; | |
1ddbe94e | 4584 | } |
b7f23c36 | 4585 | |
1ddbe94e | 4586 | /* |
499afd5b AE |
4587 | * Remove an rbd_dev from the global list, and record that its |
4588 | * identifier is no longer in use. | |
1ddbe94e | 4589 | */ |
e2839308 | 4590 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4591 | { |
499afd5b AE |
4592 | spin_lock(&rbd_dev_list_lock); |
4593 | list_del_init(&rbd_dev->node); | |
4594 | spin_unlock(&rbd_dev_list_lock); | |
b7f23c36 | 4595 | |
f8a22fc2 ID |
4596 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
4597 | ||
4598 | dout("rbd_dev %p released dev id %d\n", rbd_dev, rbd_dev->dev_id); | |
b7f23c36 AE |
4599 | } |
4600 | ||
e28fff26 AE |
4601 | /* |
4602 | * Skips over white space at *buf, and updates *buf to point to the | |
4603 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4604 | * the token (string of non-white space characters) found. Note |
4605 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4606 | */ |
4607 | static inline size_t next_token(const char **buf) | |
4608 | { | |
4609 | /* | |
4610 | * These are the characters that produce nonzero for | |
4611 | * isspace() in the "C" and "POSIX" locales. | |
4612 | */ | |
4613 | const char *spaces = " \f\n\r\t\v"; | |
4614 | ||
4615 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4616 | ||
4617 | return strcspn(*buf, spaces); /* Return token length */ | |
4618 | } | |
4619 | ||
4620 | /* | |
4621 | * Finds the next token in *buf, and if the provided token buffer is | |
4622 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4623 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4624 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4625 | * |
4626 | * Returns the length of the token found (not including the '\0'). | |
4627 | * Return value will be 0 if no token is found, and it will be >= | |
4628 | * token_size if the token would not fit. | |
4629 | * | |
593a9e7b | 4630 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4631 | * found token. Note that this occurs even if the token buffer is |
4632 | * too small to hold it. | |
4633 | */ | |
4634 | static inline size_t copy_token(const char **buf, | |
4635 | char *token, | |
4636 | size_t token_size) | |
4637 | { | |
4638 | size_t len; | |
4639 | ||
4640 | len = next_token(buf); | |
4641 | if (len < token_size) { | |
4642 | memcpy(token, *buf, len); | |
4643 | *(token + len) = '\0'; | |
4644 | } | |
4645 | *buf += len; | |
4646 | ||
4647 | return len; | |
4648 | } | |
4649 | ||
ea3352f4 AE |
4650 | /* |
4651 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4652 | * enough to hold a copy of it, and copies the token into the new | |
4653 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4654 | * that a duplicate buffer is created even for a zero-length token. | |
4655 | * | |
4656 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4657 | * pointer if memory for the duplicate was not available. If | |
4658 | * the lenp argument is a non-null pointer, the length of the token | |
4659 | * (not including the '\0') is returned in *lenp. | |
4660 | * | |
4661 | * If successful, the *buf pointer will be updated to point beyond | |
4662 | * the end of the found token. | |
4663 | * | |
4664 | * Note: uses GFP_KERNEL for allocation. | |
4665 | */ | |
4666 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4667 | { | |
4668 | char *dup; | |
4669 | size_t len; | |
4670 | ||
4671 | len = next_token(buf); | |
4caf35f9 | 4672 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4673 | if (!dup) |
4674 | return NULL; | |
ea3352f4 AE |
4675 | *(dup + len) = '\0'; |
4676 | *buf += len; | |
4677 | ||
4678 | if (lenp) | |
4679 | *lenp = len; | |
4680 | ||
4681 | return dup; | |
4682 | } | |
4683 | ||
a725f65e | 4684 | /* |
859c31df AE |
4685 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4686 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4687 | * and the data written is passed here via a NUL-terminated buffer. | |
4688 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4689 | * |
859c31df AE |
4690 | * The information extracted from these options is recorded in |
4691 | * the other parameters which return dynamically-allocated | |
4692 | * structures: | |
4693 | * ceph_opts | |
4694 | * The address of a pointer that will refer to a ceph options | |
4695 | * structure. Caller must release the returned pointer using | |
4696 | * ceph_destroy_options() when it is no longer needed. | |
4697 | * rbd_opts | |
4698 | * Address of an rbd options pointer. Fully initialized by | |
4699 | * this function; caller must release with kfree(). | |
4700 | * spec | |
4701 | * Address of an rbd image specification pointer. Fully | |
4702 | * initialized by this function based on parsed options. | |
4703 | * Caller must release with rbd_spec_put(). | |
4704 | * | |
4705 | * The options passed take this form: | |
4706 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4707 | * where: | |
4708 | * <mon_addrs> | |
4709 | * A comma-separated list of one or more monitor addresses. | |
4710 | * A monitor address is an ip address, optionally followed | |
4711 | * by a port number (separated by a colon). | |
4712 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4713 | * <options> | |
4714 | * A comma-separated list of ceph and/or rbd options. | |
4715 | * <pool_name> | |
4716 | * The name of the rados pool containing the rbd image. | |
4717 | * <image_name> | |
4718 | * The name of the image in that pool to map. | |
4719 | * <snap_id> | |
4720 | * An optional snapshot id. If provided, the mapping will | |
4721 | * present data from the image at the time that snapshot was | |
4722 | * created. The image head is used if no snapshot id is | |
4723 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4724 | */ |
859c31df | 4725 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4726 | struct ceph_options **ceph_opts, |
859c31df AE |
4727 | struct rbd_options **opts, |
4728 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4729 | { |
d22f76e7 | 4730 | size_t len; |
859c31df | 4731 | char *options; |
0ddebc0c | 4732 | const char *mon_addrs; |
ecb4dc22 | 4733 | char *snap_name; |
0ddebc0c | 4734 | size_t mon_addrs_size; |
859c31df | 4735 | struct rbd_spec *spec = NULL; |
4e9afeba | 4736 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4737 | struct ceph_options *copts; |
dc79b113 | 4738 | int ret; |
e28fff26 AE |
4739 | |
4740 | /* The first four tokens are required */ | |
4741 | ||
7ef3214a | 4742 | len = next_token(&buf); |
4fb5d671 AE |
4743 | if (!len) { |
4744 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4745 | return -EINVAL; | |
4746 | } | |
0ddebc0c | 4747 | mon_addrs = buf; |
f28e565a | 4748 | mon_addrs_size = len + 1; |
7ef3214a | 4749 | buf += len; |
a725f65e | 4750 | |
dc79b113 | 4751 | ret = -EINVAL; |
f28e565a AE |
4752 | options = dup_token(&buf, NULL); |
4753 | if (!options) | |
dc79b113 | 4754 | return -ENOMEM; |
4fb5d671 AE |
4755 | if (!*options) { |
4756 | rbd_warn(NULL, "no options provided"); | |
4757 | goto out_err; | |
4758 | } | |
e28fff26 | 4759 | |
859c31df AE |
4760 | spec = rbd_spec_alloc(); |
4761 | if (!spec) | |
f28e565a | 4762 | goto out_mem; |
859c31df AE |
4763 | |
4764 | spec->pool_name = dup_token(&buf, NULL); | |
4765 | if (!spec->pool_name) | |
4766 | goto out_mem; | |
4fb5d671 AE |
4767 | if (!*spec->pool_name) { |
4768 | rbd_warn(NULL, "no pool name provided"); | |
4769 | goto out_err; | |
4770 | } | |
e28fff26 | 4771 | |
69e7a02f | 4772 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4773 | if (!spec->image_name) |
f28e565a | 4774 | goto out_mem; |
4fb5d671 AE |
4775 | if (!*spec->image_name) { |
4776 | rbd_warn(NULL, "no image name provided"); | |
4777 | goto out_err; | |
4778 | } | |
d4b125e9 | 4779 | |
f28e565a AE |
4780 | /* |
4781 | * Snapshot name is optional; default is to use "-" | |
4782 | * (indicating the head/no snapshot). | |
4783 | */ | |
3feeb894 | 4784 | len = next_token(&buf); |
820a5f3e | 4785 | if (!len) { |
3feeb894 AE |
4786 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4787 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4788 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4789 | ret = -ENAMETOOLONG; |
f28e565a | 4790 | goto out_err; |
849b4260 | 4791 | } |
ecb4dc22 AE |
4792 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4793 | if (!snap_name) | |
f28e565a | 4794 | goto out_mem; |
ecb4dc22 AE |
4795 | *(snap_name + len) = '\0'; |
4796 | spec->snap_name = snap_name; | |
e5c35534 | 4797 | |
0ddebc0c | 4798 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4799 | |
4e9afeba AE |
4800 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4801 | if (!rbd_opts) | |
4802 | goto out_mem; | |
4803 | ||
4804 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4805 | |
859c31df | 4806 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4807 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4808 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4809 | if (IS_ERR(copts)) { |
4810 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4811 | goto out_err; |
4812 | } | |
859c31df AE |
4813 | kfree(options); |
4814 | ||
4815 | *ceph_opts = copts; | |
4e9afeba | 4816 | *opts = rbd_opts; |
859c31df | 4817 | *rbd_spec = spec; |
0ddebc0c | 4818 | |
dc79b113 | 4819 | return 0; |
f28e565a | 4820 | out_mem: |
dc79b113 | 4821 | ret = -ENOMEM; |
d22f76e7 | 4822 | out_err: |
859c31df AE |
4823 | kfree(rbd_opts); |
4824 | rbd_spec_put(spec); | |
f28e565a | 4825 | kfree(options); |
d22f76e7 | 4826 | |
dc79b113 | 4827 | return ret; |
a725f65e AE |
4828 | } |
4829 | ||
30ba1f02 ID |
4830 | /* |
4831 | * Return pool id (>= 0) or a negative error code. | |
4832 | */ | |
4833 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
4834 | { | |
4835 | u64 newest_epoch; | |
4836 | unsigned long timeout = rbdc->client->options->mount_timeout * HZ; | |
4837 | int tries = 0; | |
4838 | int ret; | |
4839 | ||
4840 | again: | |
4841 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
4842 | if (ret == -ENOENT && tries++ < 1) { | |
4843 | ret = ceph_monc_do_get_version(&rbdc->client->monc, "osdmap", | |
4844 | &newest_epoch); | |
4845 | if (ret < 0) | |
4846 | return ret; | |
4847 | ||
4848 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
4849 | ceph_monc_request_next_osdmap(&rbdc->client->monc); | |
4850 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, | |
4851 | newest_epoch, timeout); | |
4852 | goto again; | |
4853 | } else { | |
4854 | /* the osdmap we have is new enough */ | |
4855 | return -ENOENT; | |
4856 | } | |
4857 | } | |
4858 | ||
4859 | return ret; | |
4860 | } | |
4861 | ||
589d30e0 AE |
4862 | /* |
4863 | * An rbd format 2 image has a unique identifier, distinct from the | |
4864 | * name given to it by the user. Internally, that identifier is | |
4865 | * what's used to specify the names of objects related to the image. | |
4866 | * | |
4867 | * A special "rbd id" object is used to map an rbd image name to its | |
4868 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4869 | * with the supplied name. | |
4870 | * | |
4871 | * This function will record the given rbd_dev's image_id field if | |
4872 | * it can be determined, and in that case will return 0. If any | |
4873 | * errors occur a negative errno will be returned and the rbd_dev's | |
4874 | * image_id field will be unchanged (and should be NULL). | |
4875 | */ | |
4876 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4877 | { | |
4878 | int ret; | |
4879 | size_t size; | |
4880 | char *object_name; | |
4881 | void *response; | |
c0fba368 | 4882 | char *image_id; |
2f82ee54 | 4883 | |
2c0d0a10 AE |
4884 | /* |
4885 | * When probing a parent image, the image id is already | |
4886 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4887 | * need to fetch the image id again in this case. We |
4888 | * do still need to set the image format though. | |
2c0d0a10 | 4889 | */ |
c0fba368 AE |
4890 | if (rbd_dev->spec->image_id) { |
4891 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4892 | ||
2c0d0a10 | 4893 | return 0; |
c0fba368 | 4894 | } |
2c0d0a10 | 4895 | |
589d30e0 AE |
4896 | /* |
4897 | * First, see if the format 2 image id file exists, and if | |
4898 | * so, get the image's persistent id from it. | |
4899 | */ | |
69e7a02f | 4900 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4901 | object_name = kmalloc(size, GFP_NOIO); |
4902 | if (!object_name) | |
4903 | return -ENOMEM; | |
0d7dbfce | 4904 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4905 | dout("rbd id object name is %s\n", object_name); |
4906 | ||
4907 | /* Response will be an encoded string, which includes a length */ | |
4908 | ||
4909 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4910 | response = kzalloc(size, GFP_NOIO); | |
4911 | if (!response) { | |
4912 | ret = -ENOMEM; | |
4913 | goto out; | |
4914 | } | |
4915 | ||
c0fba368 AE |
4916 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4917 | ||
36be9a76 | 4918 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4919 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 4920 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 4921 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4922 | if (ret == -ENOENT) { |
4923 | image_id = kstrdup("", GFP_KERNEL); | |
4924 | ret = image_id ? 0 : -ENOMEM; | |
4925 | if (!ret) | |
4926 | rbd_dev->image_format = 1; | |
4927 | } else if (ret > sizeof (__le32)) { | |
4928 | void *p = response; | |
4929 | ||
4930 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4931 | NULL, GFP_NOIO); |
461f758a | 4932 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
4933 | if (!ret) |
4934 | rbd_dev->image_format = 2; | |
589d30e0 | 4935 | } else { |
c0fba368 AE |
4936 | ret = -EINVAL; |
4937 | } | |
4938 | ||
4939 | if (!ret) { | |
4940 | rbd_dev->spec->image_id = image_id; | |
4941 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4942 | } |
4943 | out: | |
4944 | kfree(response); | |
4945 | kfree(object_name); | |
4946 | ||
4947 | return ret; | |
4948 | } | |
4949 | ||
3abef3b3 AE |
4950 | /* |
4951 | * Undo whatever state changes are made by v1 or v2 header info | |
4952 | * call. | |
4953 | */ | |
6fd48b3b AE |
4954 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
4955 | { | |
4956 | struct rbd_image_header *header; | |
4957 | ||
392a9dad AE |
4958 | /* Drop parent reference unless it's already been done (or none) */ |
4959 | ||
4960 | if (rbd_dev->parent_overlap) | |
4961 | rbd_dev_parent_put(rbd_dev); | |
6fd48b3b AE |
4962 | |
4963 | /* Free dynamic fields from the header, then zero it out */ | |
4964 | ||
4965 | header = &rbd_dev->header; | |
812164f8 | 4966 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4967 | kfree(header->snap_sizes); |
4968 | kfree(header->snap_names); | |
4969 | kfree(header->object_prefix); | |
4970 | memset(header, 0, sizeof (*header)); | |
4971 | } | |
4972 | ||
2df3fac7 | 4973 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
4974 | { |
4975 | int ret; | |
a30b71b9 | 4976 | |
1e130199 | 4977 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 4978 | if (ret) |
b1b5402a AE |
4979 | goto out_err; |
4980 | ||
2df3fac7 AE |
4981 | /* |
4982 | * Get the and check features for the image. Currently the | |
4983 | * features are assumed to never change. | |
4984 | */ | |
b1b5402a | 4985 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 4986 | if (ret) |
9d475de5 | 4987 | goto out_err; |
35d489f9 | 4988 | |
cc070d59 AE |
4989 | /* If the image supports fancy striping, get its parameters */ |
4990 | ||
4991 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4992 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4993 | if (ret < 0) | |
4994 | goto out_err; | |
4995 | } | |
2df3fac7 | 4996 | /* No support for crypto and compression type format 2 images */ |
a30b71b9 | 4997 | |
35152979 | 4998 | return 0; |
9d475de5 | 4999 | out_err: |
642a2537 | 5000 | rbd_dev->header.features = 0; |
1e130199 AE |
5001 | kfree(rbd_dev->header.object_prefix); |
5002 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
5003 | |
5004 | return ret; | |
a30b71b9 AE |
5005 | } |
5006 | ||
124afba2 | 5007 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 5008 | { |
2f82ee54 | 5009 | struct rbd_device *parent = NULL; |
124afba2 AE |
5010 | struct rbd_spec *parent_spec; |
5011 | struct rbd_client *rbdc; | |
5012 | int ret; | |
5013 | ||
5014 | if (!rbd_dev->parent_spec) | |
5015 | return 0; | |
5016 | /* | |
5017 | * We need to pass a reference to the client and the parent | |
5018 | * spec when creating the parent rbd_dev. Images related by | |
5019 | * parent/child relationships always share both. | |
5020 | */ | |
5021 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
5022 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
5023 | ||
5024 | ret = -ENOMEM; | |
5025 | parent = rbd_dev_create(rbdc, parent_spec); | |
5026 | if (!parent) | |
5027 | goto out_err; | |
5028 | ||
1f3ef788 | 5029 | ret = rbd_dev_image_probe(parent, false); |
124afba2 AE |
5030 | if (ret < 0) |
5031 | goto out_err; | |
5032 | rbd_dev->parent = parent; | |
a2acd00e | 5033 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 AE |
5034 | |
5035 | return 0; | |
5036 | out_err: | |
5037 | if (parent) { | |
fb65d228 | 5038 | rbd_dev_unparent(rbd_dev); |
124afba2 AE |
5039 | kfree(rbd_dev->header_name); |
5040 | rbd_dev_destroy(parent); | |
5041 | } else { | |
5042 | rbd_put_client(rbdc); | |
5043 | rbd_spec_put(parent_spec); | |
5044 | } | |
5045 | ||
5046 | return ret; | |
5047 | } | |
5048 | ||
200a6a8b | 5049 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5050 | { |
83a06263 | 5051 | int ret; |
d1cf5788 | 5052 | |
f8a22fc2 ID |
5053 | /* Get an id and fill in device name. */ |
5054 | ||
5055 | ret = rbd_dev_id_get(rbd_dev); | |
5056 | if (ret) | |
5057 | return ret; | |
83a06263 | 5058 | |
83a06263 AE |
5059 | BUILD_BUG_ON(DEV_NAME_LEN |
5060 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
5061 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
5062 | ||
9b60e70b | 5063 | /* Record our major and minor device numbers. */ |
83a06263 | 5064 | |
9b60e70b ID |
5065 | if (!single_major) { |
5066 | ret = register_blkdev(0, rbd_dev->name); | |
5067 | if (ret < 0) | |
5068 | goto err_out_id; | |
5069 | ||
5070 | rbd_dev->major = ret; | |
5071 | rbd_dev->minor = 0; | |
5072 | } else { | |
5073 | rbd_dev->major = rbd_major; | |
5074 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5075 | } | |
83a06263 AE |
5076 | |
5077 | /* Set up the blkdev mapping. */ | |
5078 | ||
5079 | ret = rbd_init_disk(rbd_dev); | |
5080 | if (ret) | |
5081 | goto err_out_blkdev; | |
5082 | ||
f35a4dee | 5083 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5084 | if (ret) |
5085 | goto err_out_disk; | |
f35a4dee | 5086 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
22001f61 | 5087 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
f35a4dee AE |
5088 | |
5089 | ret = rbd_bus_add_dev(rbd_dev); | |
5090 | if (ret) | |
5091 | goto err_out_mapping; | |
83a06263 | 5092 | |
83a06263 AE |
5093 | /* Everything's ready. Announce the disk to the world. */ |
5094 | ||
129b79d4 | 5095 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
5096 | add_disk(rbd_dev->disk); |
5097 | ||
5098 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
5099 | (unsigned long long) rbd_dev->mapping.size); | |
5100 | ||
5101 | return ret; | |
2f82ee54 | 5102 | |
f35a4dee AE |
5103 | err_out_mapping: |
5104 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5105 | err_out_disk: |
5106 | rbd_free_disk(rbd_dev); | |
5107 | err_out_blkdev: | |
9b60e70b ID |
5108 | if (!single_major) |
5109 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
83a06263 AE |
5110 | err_out_id: |
5111 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 5112 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
5113 | |
5114 | return ret; | |
5115 | } | |
5116 | ||
332bb12d AE |
5117 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5118 | { | |
5119 | struct rbd_spec *spec = rbd_dev->spec; | |
5120 | size_t size; | |
5121 | ||
5122 | /* Record the header object name for this rbd image. */ | |
5123 | ||
5124 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5125 | ||
5126 | if (rbd_dev->image_format == 1) | |
5127 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
5128 | else | |
5129 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
5130 | ||
5131 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
5132 | if (!rbd_dev->header_name) | |
5133 | return -ENOMEM; | |
5134 | ||
5135 | if (rbd_dev->image_format == 1) | |
5136 | sprintf(rbd_dev->header_name, "%s%s", | |
5137 | spec->image_name, RBD_SUFFIX); | |
5138 | else | |
5139 | sprintf(rbd_dev->header_name, "%s%s", | |
5140 | RBD_HEADER_PREFIX, spec->image_id); | |
5141 | return 0; | |
5142 | } | |
5143 | ||
200a6a8b AE |
5144 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5145 | { | |
6fd48b3b | 5146 | rbd_dev_unprobe(rbd_dev); |
200a6a8b | 5147 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
5148 | rbd_dev->header_name = NULL; |
5149 | rbd_dev->image_format = 0; | |
5150 | kfree(rbd_dev->spec->image_id); | |
5151 | rbd_dev->spec->image_id = NULL; | |
5152 | ||
200a6a8b AE |
5153 | rbd_dev_destroy(rbd_dev); |
5154 | } | |
5155 | ||
a30b71b9 AE |
5156 | /* |
5157 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5158 | * device. If this image is the one being mapped (i.e., not a |
5159 | * parent), initiate a watch on its header object before using that | |
5160 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5161 | */ |
1f3ef788 | 5162 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping) |
a30b71b9 AE |
5163 | { |
5164 | int ret; | |
5165 | ||
5166 | /* | |
3abef3b3 AE |
5167 | * Get the id from the image id object. Unless there's an |
5168 | * error, rbd_dev->spec->image_id will be filled in with | |
5169 | * a dynamically-allocated string, and rbd_dev->image_format | |
5170 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5171 | */ |
5172 | ret = rbd_dev_image_id(rbd_dev); | |
5173 | if (ret) | |
c0fba368 AE |
5174 | return ret; |
5175 | rbd_assert(rbd_dev->spec->image_id); | |
5176 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5177 | ||
332bb12d AE |
5178 | ret = rbd_dev_header_name(rbd_dev); |
5179 | if (ret) | |
5180 | goto err_out_format; | |
5181 | ||
1f3ef788 | 5182 | if (mapping) { |
fca27065 | 5183 | ret = rbd_dev_header_watch_sync(rbd_dev); |
1f3ef788 AE |
5184 | if (ret) |
5185 | goto out_header_name; | |
5186 | } | |
b644de2b | 5187 | |
c0fba368 | 5188 | if (rbd_dev->image_format == 1) |
99a41ebc | 5189 | ret = rbd_dev_v1_header_info(rbd_dev); |
a30b71b9 | 5190 | else |
2df3fac7 | 5191 | ret = rbd_dev_v2_header_info(rbd_dev); |
5655c4d9 | 5192 | if (ret) |
b644de2b | 5193 | goto err_out_watch; |
83a06263 | 5194 | |
9bb81c9b AE |
5195 | ret = rbd_dev_spec_update(rbd_dev); |
5196 | if (ret) | |
33dca39f | 5197 | goto err_out_probe; |
9bb81c9b AE |
5198 | |
5199 | ret = rbd_dev_probe_parent(rbd_dev); | |
30d60ba2 AE |
5200 | if (ret) |
5201 | goto err_out_probe; | |
5202 | ||
5203 | dout("discovered format %u image, header name is %s\n", | |
5204 | rbd_dev->image_format, rbd_dev->header_name); | |
83a06263 | 5205 | |
30d60ba2 | 5206 | return 0; |
6fd48b3b AE |
5207 | err_out_probe: |
5208 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5209 | err_out_watch: |
fca27065 ID |
5210 | if (mapping) |
5211 | rbd_dev_header_unwatch_sync(rbd_dev); | |
332bb12d AE |
5212 | out_header_name: |
5213 | kfree(rbd_dev->header_name); | |
5214 | rbd_dev->header_name = NULL; | |
5215 | err_out_format: | |
5216 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5217 | kfree(rbd_dev->spec->image_id); |
5218 | rbd_dev->spec->image_id = NULL; | |
5219 | ||
5220 | dout("probe failed, returning %d\n", ret); | |
5221 | ||
a30b71b9 AE |
5222 | return ret; |
5223 | } | |
5224 | ||
9b60e70b ID |
5225 | static ssize_t do_rbd_add(struct bus_type *bus, |
5226 | const char *buf, | |
5227 | size_t count) | |
602adf40 | 5228 | { |
cb8627c7 | 5229 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5230 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5231 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5232 | struct rbd_spec *spec = NULL; |
9d3997fd | 5233 | struct rbd_client *rbdc; |
51344a38 | 5234 | bool read_only; |
27cc2594 | 5235 | int rc = -ENOMEM; |
602adf40 YS |
5236 | |
5237 | if (!try_module_get(THIS_MODULE)) | |
5238 | return -ENODEV; | |
5239 | ||
602adf40 | 5240 | /* parse add command */ |
859c31df | 5241 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5242 | if (rc < 0) |
bd4ba655 | 5243 | goto err_out_module; |
51344a38 AE |
5244 | read_only = rbd_opts->read_only; |
5245 | kfree(rbd_opts); | |
5246 | rbd_opts = NULL; /* done with this */ | |
78cea76e | 5247 | |
9d3997fd AE |
5248 | rbdc = rbd_get_client(ceph_opts); |
5249 | if (IS_ERR(rbdc)) { | |
5250 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5251 | goto err_out_args; |
9d3997fd | 5252 | } |
602adf40 | 5253 | |
602adf40 | 5254 | /* pick the pool */ |
30ba1f02 | 5255 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
602adf40 YS |
5256 | if (rc < 0) |
5257 | goto err_out_client; | |
c0cd10db | 5258 | spec->pool_id = (u64)rc; |
859c31df | 5259 | |
0903e875 AE |
5260 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5261 | ||
c0cd10db AE |
5262 | if (spec->pool_id > (u64)U32_MAX) { |
5263 | rbd_warn(NULL, "pool id too large (%llu > %u)\n", | |
5264 | (unsigned long long)spec->pool_id, U32_MAX); | |
0903e875 AE |
5265 | rc = -EIO; |
5266 | goto err_out_client; | |
5267 | } | |
5268 | ||
c53d5893 | 5269 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
5270 | if (!rbd_dev) |
5271 | goto err_out_client; | |
c53d5893 AE |
5272 | rbdc = NULL; /* rbd_dev now owns this */ |
5273 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 5274 | |
1f3ef788 | 5275 | rc = rbd_dev_image_probe(rbd_dev, true); |
a30b71b9 | 5276 | if (rc < 0) |
c53d5893 | 5277 | goto err_out_rbd_dev; |
05fd6f6f | 5278 | |
7ce4eef7 AE |
5279 | /* If we are mapping a snapshot it must be marked read-only */ |
5280 | ||
5281 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) | |
5282 | read_only = true; | |
5283 | rbd_dev->mapping.read_only = read_only; | |
5284 | ||
b536f69a | 5285 | rc = rbd_dev_device_setup(rbd_dev); |
3abef3b3 | 5286 | if (rc) { |
e37180c0 ID |
5287 | /* |
5288 | * rbd_dev_header_unwatch_sync() can't be moved into | |
5289 | * rbd_dev_image_release() without refactoring, see | |
5290 | * commit 1f3ef78861ac. | |
5291 | */ | |
5292 | rbd_dev_header_unwatch_sync(rbd_dev); | |
3abef3b3 AE |
5293 | rbd_dev_image_release(rbd_dev); |
5294 | goto err_out_module; | |
5295 | } | |
5296 | ||
5297 | return count; | |
b536f69a | 5298 | |
c53d5893 AE |
5299 | err_out_rbd_dev: |
5300 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5301 | err_out_client: |
9d3997fd | 5302 | rbd_put_client(rbdc); |
0ddebc0c | 5303 | err_out_args: |
859c31df | 5304 | rbd_spec_put(spec); |
bd4ba655 AE |
5305 | err_out_module: |
5306 | module_put(THIS_MODULE); | |
27cc2594 | 5307 | |
602adf40 | 5308 | dout("Error adding device %s\n", buf); |
27cc2594 | 5309 | |
c0cd10db | 5310 | return (ssize_t)rc; |
602adf40 YS |
5311 | } |
5312 | ||
9b60e70b ID |
5313 | static ssize_t rbd_add(struct bus_type *bus, |
5314 | const char *buf, | |
5315 | size_t count) | |
5316 | { | |
5317 | if (single_major) | |
5318 | return -EINVAL; | |
5319 | ||
5320 | return do_rbd_add(bus, buf, count); | |
5321 | } | |
5322 | ||
5323 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5324 | const char *buf, | |
5325 | size_t count) | |
5326 | { | |
5327 | return do_rbd_add(bus, buf, count); | |
5328 | } | |
5329 | ||
200a6a8b | 5330 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 5331 | { |
593a9e7b | 5332 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 5333 | |
602adf40 | 5334 | rbd_free_disk(rbd_dev); |
200a6a8b | 5335 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
6d80b130 | 5336 | rbd_dev_mapping_clear(rbd_dev); |
9b60e70b ID |
5337 | if (!single_major) |
5338 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
e2839308 | 5339 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 5340 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
5341 | } |
5342 | ||
05a46afd AE |
5343 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5344 | { | |
ad945fc1 | 5345 | while (rbd_dev->parent) { |
05a46afd AE |
5346 | struct rbd_device *first = rbd_dev; |
5347 | struct rbd_device *second = first->parent; | |
5348 | struct rbd_device *third; | |
5349 | ||
5350 | /* | |
5351 | * Follow to the parent with no grandparent and | |
5352 | * remove it. | |
5353 | */ | |
5354 | while (second && (third = second->parent)) { | |
5355 | first = second; | |
5356 | second = third; | |
5357 | } | |
ad945fc1 | 5358 | rbd_assert(second); |
8ad42cd0 | 5359 | rbd_dev_image_release(second); |
ad945fc1 AE |
5360 | first->parent = NULL; |
5361 | first->parent_overlap = 0; | |
5362 | ||
5363 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5364 | rbd_spec_put(first->parent_spec); |
5365 | first->parent_spec = NULL; | |
05a46afd AE |
5366 | } |
5367 | } | |
5368 | ||
9b60e70b ID |
5369 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5370 | const char *buf, | |
5371 | size_t count) | |
602adf40 YS |
5372 | { |
5373 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5374 | struct list_head *tmp; |
5375 | int dev_id; | |
602adf40 | 5376 | unsigned long ul; |
82a442d2 | 5377 | bool already = false; |
0d8189e1 | 5378 | int ret; |
602adf40 | 5379 | |
bb8e0e84 | 5380 | ret = kstrtoul(buf, 10, &ul); |
0d8189e1 AE |
5381 | if (ret) |
5382 | return ret; | |
602adf40 YS |
5383 | |
5384 | /* convert to int; abort if we lost anything in the conversion */ | |
751cc0e3 AE |
5385 | dev_id = (int)ul; |
5386 | if (dev_id != ul) | |
602adf40 YS |
5387 | return -EINVAL; |
5388 | ||
751cc0e3 AE |
5389 | ret = -ENOENT; |
5390 | spin_lock(&rbd_dev_list_lock); | |
5391 | list_for_each(tmp, &rbd_dev_list) { | |
5392 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5393 | if (rbd_dev->dev_id == dev_id) { | |
5394 | ret = 0; | |
5395 | break; | |
5396 | } | |
42382b70 | 5397 | } |
751cc0e3 AE |
5398 | if (!ret) { |
5399 | spin_lock_irq(&rbd_dev->lock); | |
5400 | if (rbd_dev->open_count) | |
5401 | ret = -EBUSY; | |
5402 | else | |
82a442d2 AE |
5403 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5404 | &rbd_dev->flags); | |
751cc0e3 AE |
5405 | spin_unlock_irq(&rbd_dev->lock); |
5406 | } | |
5407 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5408 | if (ret < 0 || already) |
1ba0f1e7 | 5409 | return ret; |
751cc0e3 | 5410 | |
fca27065 | 5411 | rbd_dev_header_unwatch_sync(rbd_dev); |
9abc5990 JD |
5412 | /* |
5413 | * flush remaining watch callbacks - these must be complete | |
5414 | * before the osd_client is shutdown | |
5415 | */ | |
5416 | dout("%s: flushing notifies", __func__); | |
5417 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); | |
fca27065 | 5418 | |
9875201e JD |
5419 | /* |
5420 | * Don't free anything from rbd_dev->disk until after all | |
5421 | * notifies are completely processed. Otherwise | |
5422 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting | |
5423 | * in a potential use after free of rbd_dev->disk or rbd_dev. | |
5424 | */ | |
5425 | rbd_bus_del_dev(rbd_dev); | |
8ad42cd0 | 5426 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 5427 | module_put(THIS_MODULE); |
aafb230e | 5428 | |
1ba0f1e7 | 5429 | return count; |
602adf40 YS |
5430 | } |
5431 | ||
9b60e70b ID |
5432 | static ssize_t rbd_remove(struct bus_type *bus, |
5433 | const char *buf, | |
5434 | size_t count) | |
5435 | { | |
5436 | if (single_major) | |
5437 | return -EINVAL; | |
5438 | ||
5439 | return do_rbd_remove(bus, buf, count); | |
5440 | } | |
5441 | ||
5442 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5443 | const char *buf, | |
5444 | size_t count) | |
5445 | { | |
5446 | return do_rbd_remove(bus, buf, count); | |
5447 | } | |
5448 | ||
602adf40 YS |
5449 | /* |
5450 | * create control files in sysfs | |
dfc5606d | 5451 | * /sys/bus/rbd/... |
602adf40 YS |
5452 | */ |
5453 | static int rbd_sysfs_init(void) | |
5454 | { | |
dfc5606d | 5455 | int ret; |
602adf40 | 5456 | |
fed4c143 | 5457 | ret = device_register(&rbd_root_dev); |
21079786 | 5458 | if (ret < 0) |
dfc5606d | 5459 | return ret; |
602adf40 | 5460 | |
fed4c143 AE |
5461 | ret = bus_register(&rbd_bus_type); |
5462 | if (ret < 0) | |
5463 | device_unregister(&rbd_root_dev); | |
602adf40 | 5464 | |
602adf40 YS |
5465 | return ret; |
5466 | } | |
5467 | ||
5468 | static void rbd_sysfs_cleanup(void) | |
5469 | { | |
dfc5606d | 5470 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5471 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5472 | } |
5473 | ||
1c2a9dfe AE |
5474 | static int rbd_slab_init(void) |
5475 | { | |
5476 | rbd_assert(!rbd_img_request_cache); | |
5477 | rbd_img_request_cache = kmem_cache_create("rbd_img_request", | |
5478 | sizeof (struct rbd_img_request), | |
5479 | __alignof__(struct rbd_img_request), | |
5480 | 0, NULL); | |
868311b1 AE |
5481 | if (!rbd_img_request_cache) |
5482 | return -ENOMEM; | |
5483 | ||
5484 | rbd_assert(!rbd_obj_request_cache); | |
5485 | rbd_obj_request_cache = kmem_cache_create("rbd_obj_request", | |
5486 | sizeof (struct rbd_obj_request), | |
5487 | __alignof__(struct rbd_obj_request), | |
5488 | 0, NULL); | |
78c2a44a AE |
5489 | if (!rbd_obj_request_cache) |
5490 | goto out_err; | |
5491 | ||
5492 | rbd_assert(!rbd_segment_name_cache); | |
5493 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
2d0ebc5d | 5494 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
78c2a44a | 5495 | if (rbd_segment_name_cache) |
1c2a9dfe | 5496 | return 0; |
78c2a44a AE |
5497 | out_err: |
5498 | if (rbd_obj_request_cache) { | |
5499 | kmem_cache_destroy(rbd_obj_request_cache); | |
5500 | rbd_obj_request_cache = NULL; | |
5501 | } | |
1c2a9dfe | 5502 | |
868311b1 AE |
5503 | kmem_cache_destroy(rbd_img_request_cache); |
5504 | rbd_img_request_cache = NULL; | |
5505 | ||
1c2a9dfe AE |
5506 | return -ENOMEM; |
5507 | } | |
5508 | ||
5509 | static void rbd_slab_exit(void) | |
5510 | { | |
78c2a44a AE |
5511 | rbd_assert(rbd_segment_name_cache); |
5512 | kmem_cache_destroy(rbd_segment_name_cache); | |
5513 | rbd_segment_name_cache = NULL; | |
5514 | ||
868311b1 AE |
5515 | rbd_assert(rbd_obj_request_cache); |
5516 | kmem_cache_destroy(rbd_obj_request_cache); | |
5517 | rbd_obj_request_cache = NULL; | |
5518 | ||
1c2a9dfe AE |
5519 | rbd_assert(rbd_img_request_cache); |
5520 | kmem_cache_destroy(rbd_img_request_cache); | |
5521 | rbd_img_request_cache = NULL; | |
5522 | } | |
5523 | ||
cc344fa1 | 5524 | static int __init rbd_init(void) |
602adf40 YS |
5525 | { |
5526 | int rc; | |
5527 | ||
1e32d34c AE |
5528 | if (!libceph_compatible(NULL)) { |
5529 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5530 | return -EINVAL; |
5531 | } | |
e1b4d96d | 5532 | |
1c2a9dfe | 5533 | rc = rbd_slab_init(); |
602adf40 YS |
5534 | if (rc) |
5535 | return rc; | |
e1b4d96d | 5536 | |
9b60e70b ID |
5537 | if (single_major) { |
5538 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5539 | if (rbd_major < 0) { | |
5540 | rc = rbd_major; | |
5541 | goto err_out_slab; | |
5542 | } | |
5543 | } | |
5544 | ||
1c2a9dfe AE |
5545 | rc = rbd_sysfs_init(); |
5546 | if (rc) | |
9b60e70b ID |
5547 | goto err_out_blkdev; |
5548 | ||
5549 | if (single_major) | |
5550 | pr_info("loaded (major %d)\n", rbd_major); | |
5551 | else | |
5552 | pr_info("loaded\n"); | |
1c2a9dfe | 5553 | |
e1b4d96d ID |
5554 | return 0; |
5555 | ||
9b60e70b ID |
5556 | err_out_blkdev: |
5557 | if (single_major) | |
5558 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
e1b4d96d ID |
5559 | err_out_slab: |
5560 | rbd_slab_exit(); | |
1c2a9dfe | 5561 | return rc; |
602adf40 YS |
5562 | } |
5563 | ||
cc344fa1 | 5564 | static void __exit rbd_exit(void) |
602adf40 | 5565 | { |
ffe312cf | 5566 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 5567 | rbd_sysfs_cleanup(); |
9b60e70b ID |
5568 | if (single_major) |
5569 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
1c2a9dfe | 5570 | rbd_slab_exit(); |
602adf40 YS |
5571 | } |
5572 | ||
5573 | module_init(rbd_init); | |
5574 | module_exit(rbd_exit); | |
5575 | ||
d552c619 | 5576 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
5577 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
5578 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
5579 | /* following authorship retained from original osdblk.c */ |
5580 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5581 | ||
90da258b | 5582 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 5583 | MODULE_LICENSE("GPL"); |