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> | |
7ad18afa | 41 | #include <linux/blk-mq.h> |
602adf40 YS |
42 | #include <linux/fs.h> |
43 | #include <linux/blkdev.h> | |
1c2a9dfe | 44 | #include <linux/slab.h> |
f8a22fc2 | 45 | #include <linux/idr.h> |
bc1ecc65 | 46 | #include <linux/workqueue.h> |
602adf40 YS |
47 | |
48 | #include "rbd_types.h" | |
49 | ||
aafb230e AE |
50 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
51 | ||
593a9e7b AE |
52 | /* |
53 | * The basic unit of block I/O is a sector. It is interpreted in a | |
54 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
55 | * universally 512 bytes. These symbols are just slightly more | |
56 | * meaningful than the bare numbers they represent. | |
57 | */ | |
58 | #define SECTOR_SHIFT 9 | |
59 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
60 | ||
a2acd00e AE |
61 | /* |
62 | * Increment the given counter and return its updated value. | |
63 | * If the counter is already 0 it will not be incremented. | |
64 | * If the counter is already at its maximum value returns | |
65 | * -EINVAL without updating it. | |
66 | */ | |
67 | static int atomic_inc_return_safe(atomic_t *v) | |
68 | { | |
69 | unsigned int counter; | |
70 | ||
71 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
72 | if (counter <= (unsigned int)INT_MAX) | |
73 | return (int)counter; | |
74 | ||
75 | atomic_dec(v); | |
76 | ||
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
81 | static int atomic_dec_return_safe(atomic_t *v) | |
82 | { | |
83 | int counter; | |
84 | ||
85 | counter = atomic_dec_return(v); | |
86 | if (counter >= 0) | |
87 | return counter; | |
88 | ||
89 | atomic_inc(v); | |
90 | ||
91 | return -EINVAL; | |
92 | } | |
93 | ||
f0f8cef5 | 94 | #define RBD_DRV_NAME "rbd" |
602adf40 | 95 | |
7e513d43 ID |
96 | #define RBD_MINORS_PER_MAJOR 256 |
97 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 98 | |
6d69bb53 ID |
99 | #define RBD_MAX_PARENT_CHAIN_LEN 16 |
100 | ||
d4b125e9 AE |
101 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
102 | #define RBD_MAX_SNAP_NAME_LEN \ | |
103 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
104 | ||
35d489f9 | 105 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
106 | |
107 | #define RBD_SNAP_HEAD_NAME "-" | |
108 | ||
9682fc6d AE |
109 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
110 | ||
9e15b77d AE |
111 | /* This allows a single page to hold an image name sent by OSD */ |
112 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 113 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 114 | |
1e130199 | 115 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 116 | |
99d16943 ID |
117 | #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
118 | ||
d889140c AE |
119 | /* Feature bits */ |
120 | ||
5cbf6f12 AE |
121 | #define RBD_FEATURE_LAYERING (1<<0) |
122 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
123 | #define RBD_FEATURES_ALL \ | |
124 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
125 | |
126 | /* Features supported by this (client software) implementation. */ | |
127 | ||
770eba6e | 128 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 129 | |
81a89793 AE |
130 | /* |
131 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
132 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
81a89793 | 133 | */ |
602adf40 YS |
134 | #define DEV_NAME_LEN 32 |
135 | ||
136 | /* | |
137 | * block device image metadata (in-memory version) | |
138 | */ | |
139 | struct rbd_image_header { | |
f35a4dee | 140 | /* These six fields never change for a given rbd image */ |
849b4260 | 141 | char *object_prefix; |
602adf40 YS |
142 | __u8 obj_order; |
143 | __u8 crypt_type; | |
144 | __u8 comp_type; | |
f35a4dee AE |
145 | u64 stripe_unit; |
146 | u64 stripe_count; | |
147 | u64 features; /* Might be changeable someday? */ | |
602adf40 | 148 | |
f84344f3 AE |
149 | /* The remaining fields need to be updated occasionally */ |
150 | u64 image_size; | |
151 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
152 | char *snap_names; /* format 1 only */ |
153 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
154 | }; |
155 | ||
0d7dbfce AE |
156 | /* |
157 | * An rbd image specification. | |
158 | * | |
159 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
160 | * identify an image. Each rbd_dev structure includes a pointer to |
161 | * an rbd_spec structure that encapsulates this identity. | |
162 | * | |
163 | * Each of the id's in an rbd_spec has an associated name. For a | |
164 | * user-mapped image, the names are supplied and the id's associated | |
165 | * with them are looked up. For a layered image, a parent image is | |
166 | * defined by the tuple, and the names are looked up. | |
167 | * | |
168 | * An rbd_dev structure contains a parent_spec pointer which is | |
169 | * non-null if the image it represents is a child in a layered | |
170 | * image. This pointer will refer to the rbd_spec structure used | |
171 | * by the parent rbd_dev for its own identity (i.e., the structure | |
172 | * is shared between the parent and child). | |
173 | * | |
174 | * Since these structures are populated once, during the discovery | |
175 | * phase of image construction, they are effectively immutable so | |
176 | * we make no effort to synchronize access to them. | |
177 | * | |
178 | * Note that code herein does not assume the image name is known (it | |
179 | * could be a null pointer). | |
0d7dbfce AE |
180 | */ |
181 | struct rbd_spec { | |
182 | u64 pool_id; | |
ecb4dc22 | 183 | const char *pool_name; |
0d7dbfce | 184 | |
ecb4dc22 AE |
185 | const char *image_id; |
186 | const char *image_name; | |
0d7dbfce AE |
187 | |
188 | u64 snap_id; | |
ecb4dc22 | 189 | const char *snap_name; |
0d7dbfce AE |
190 | |
191 | struct kref kref; | |
192 | }; | |
193 | ||
602adf40 | 194 | /* |
f0f8cef5 | 195 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
196 | */ |
197 | struct rbd_client { | |
198 | struct ceph_client *client; | |
199 | struct kref kref; | |
200 | struct list_head node; | |
201 | }; | |
202 | ||
bf0d5f50 AE |
203 | struct rbd_img_request; |
204 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
205 | ||
206 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
207 | ||
208 | struct rbd_obj_request; | |
209 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
210 | ||
9969ebc5 AE |
211 | enum obj_request_type { |
212 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
213 | }; | |
bf0d5f50 | 214 | |
6d2940c8 GZ |
215 | enum obj_operation_type { |
216 | OBJ_OP_WRITE, | |
217 | OBJ_OP_READ, | |
90e98c52 | 218 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
219 | }; |
220 | ||
926f9b3f AE |
221 | enum obj_req_flags { |
222 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 223 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
224 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
225 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
226 | }; |
227 | ||
bf0d5f50 AE |
228 | struct rbd_obj_request { |
229 | const char *object_name; | |
230 | u64 offset; /* object start byte */ | |
231 | u64 length; /* bytes from offset */ | |
926f9b3f | 232 | unsigned long flags; |
bf0d5f50 | 233 | |
c5b5ef6c AE |
234 | /* |
235 | * An object request associated with an image will have its | |
236 | * img_data flag set; a standalone object request will not. | |
237 | * | |
238 | * A standalone object request will have which == BAD_WHICH | |
239 | * and a null obj_request pointer. | |
240 | * | |
241 | * An object request initiated in support of a layered image | |
242 | * object (to check for its existence before a write) will | |
243 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
244 | * | |
245 | * Finally, an object request for rbd image data will have | |
246 | * which != BAD_WHICH, and will have a non-null img_request | |
247 | * pointer. The value of which will be in the range | |
248 | * 0..(img_request->obj_request_count-1). | |
249 | */ | |
250 | union { | |
251 | struct rbd_obj_request *obj_request; /* STAT op */ | |
252 | struct { | |
253 | struct rbd_img_request *img_request; | |
254 | u64 img_offset; | |
255 | /* links for img_request->obj_requests list */ | |
256 | struct list_head links; | |
257 | }; | |
258 | }; | |
bf0d5f50 AE |
259 | u32 which; /* posn image request list */ |
260 | ||
261 | enum obj_request_type type; | |
788e2df3 AE |
262 | union { |
263 | struct bio *bio_list; | |
264 | struct { | |
265 | struct page **pages; | |
266 | u32 page_count; | |
267 | }; | |
268 | }; | |
0eefd470 | 269 | struct page **copyup_pages; |
ebda6408 | 270 | u32 copyup_page_count; |
bf0d5f50 AE |
271 | |
272 | struct ceph_osd_request *osd_req; | |
273 | ||
274 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 275 | int result; |
bf0d5f50 AE |
276 | |
277 | rbd_obj_callback_t callback; | |
788e2df3 | 278 | struct completion completion; |
bf0d5f50 AE |
279 | |
280 | struct kref kref; | |
281 | }; | |
282 | ||
0c425248 | 283 | enum img_req_flags { |
9849e986 AE |
284 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
285 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 286 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
90e98c52 | 287 | IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
0c425248 AE |
288 | }; |
289 | ||
bf0d5f50 | 290 | struct rbd_img_request { |
bf0d5f50 AE |
291 | struct rbd_device *rbd_dev; |
292 | u64 offset; /* starting image byte offset */ | |
293 | u64 length; /* byte count from offset */ | |
0c425248 | 294 | unsigned long flags; |
bf0d5f50 | 295 | union { |
9849e986 | 296 | u64 snap_id; /* for reads */ |
bf0d5f50 | 297 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
298 | }; |
299 | union { | |
300 | struct request *rq; /* block request */ | |
301 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 302 | }; |
3d7efd18 | 303 | struct page **copyup_pages; |
ebda6408 | 304 | u32 copyup_page_count; |
bf0d5f50 AE |
305 | spinlock_t completion_lock;/* protects next_completion */ |
306 | u32 next_completion; | |
307 | rbd_img_callback_t callback; | |
55f27e09 | 308 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 309 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
310 | |
311 | u32 obj_request_count; | |
312 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
313 | ||
314 | struct kref kref; | |
315 | }; | |
316 | ||
317 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 318 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 319 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 320 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 321 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 322 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 323 | |
99d16943 ID |
324 | enum rbd_watch_state { |
325 | RBD_WATCH_STATE_UNREGISTERED, | |
326 | RBD_WATCH_STATE_REGISTERED, | |
327 | RBD_WATCH_STATE_ERROR, | |
328 | }; | |
329 | ||
f84344f3 | 330 | struct rbd_mapping { |
99c1f08f | 331 | u64 size; |
34b13184 | 332 | u64 features; |
f84344f3 AE |
333 | bool read_only; |
334 | }; | |
335 | ||
602adf40 YS |
336 | /* |
337 | * a single device | |
338 | */ | |
339 | struct rbd_device { | |
de71a297 | 340 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
341 | |
342 | int major; /* blkdev assigned major */ | |
dd82fff1 | 343 | int minor; |
602adf40 | 344 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 345 | |
a30b71b9 | 346 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
347 | struct rbd_client *rbd_client; |
348 | ||
349 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
350 | ||
b82d167b | 351 | spinlock_t lock; /* queue, flags, open_count */ |
602adf40 YS |
352 | |
353 | struct rbd_image_header header; | |
b82d167b | 354 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 355 | struct rbd_spec *spec; |
d147543d | 356 | struct rbd_options *opts; |
602adf40 | 357 | |
c41d13a3 | 358 | struct ceph_object_id header_oid; |
922dab61 | 359 | struct ceph_object_locator header_oloc; |
971f839a | 360 | |
1643dfa4 | 361 | struct ceph_file_layout layout; /* used for all rbd requests */ |
0903e875 | 362 | |
99d16943 ID |
363 | struct mutex watch_mutex; |
364 | enum rbd_watch_state watch_state; | |
922dab61 | 365 | struct ceph_osd_linger_request *watch_handle; |
99d16943 ID |
366 | u64 watch_cookie; |
367 | struct delayed_work watch_dwork; | |
59c2be1e | 368 | |
1643dfa4 ID |
369 | struct workqueue_struct *task_wq; |
370 | ||
86b00e0d AE |
371 | struct rbd_spec *parent_spec; |
372 | u64 parent_overlap; | |
a2acd00e | 373 | atomic_t parent_ref; |
2f82ee54 | 374 | struct rbd_device *parent; |
86b00e0d | 375 | |
7ad18afa CH |
376 | /* Block layer tags. */ |
377 | struct blk_mq_tag_set tag_set; | |
378 | ||
c666601a JD |
379 | /* protects updating the header */ |
380 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
381 | |
382 | struct rbd_mapping mapping; | |
602adf40 YS |
383 | |
384 | struct list_head node; | |
dfc5606d | 385 | |
dfc5606d YS |
386 | /* sysfs related */ |
387 | struct device dev; | |
b82d167b | 388 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
389 | }; |
390 | ||
b82d167b AE |
391 | /* |
392 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
393 | * rbd_dev->lock is used to protect access. | |
394 | * | |
395 | * Currently, only the "removing" flag (which is coupled with the | |
396 | * "open_count" field) requires atomic access. | |
397 | */ | |
6d292906 AE |
398 | enum rbd_dev_flags { |
399 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 400 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
401 | }; |
402 | ||
cfbf6377 | 403 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 404 | |
602adf40 | 405 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
406 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
407 | ||
432b8587 AE |
408 | static LIST_HEAD(rbd_client_list); /* clients */ |
409 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 410 | |
78c2a44a AE |
411 | /* Slab caches for frequently-allocated structures */ |
412 | ||
1c2a9dfe | 413 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 414 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 415 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 416 | |
9b60e70b | 417 | static int rbd_major; |
f8a22fc2 ID |
418 | static DEFINE_IDA(rbd_dev_id_ida); |
419 | ||
f5ee37bd ID |
420 | static struct workqueue_struct *rbd_wq; |
421 | ||
9b60e70b ID |
422 | /* |
423 | * Default to false for now, as single-major requires >= 0.75 version of | |
424 | * userspace rbd utility. | |
425 | */ | |
426 | static bool single_major = false; | |
427 | module_param(single_major, bool, S_IRUGO); | |
428 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); | |
429 | ||
3d7efd18 AE |
430 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
431 | ||
f0f8cef5 AE |
432 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
433 | size_t count); | |
434 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
435 | size_t count); | |
9b60e70b ID |
436 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
437 | size_t count); | |
438 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
439 | size_t count); | |
6d69bb53 | 440 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
a2acd00e | 441 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 442 | |
9b60e70b ID |
443 | static int rbd_dev_id_to_minor(int dev_id) |
444 | { | |
7e513d43 | 445 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
446 | } |
447 | ||
448 | static int minor_to_rbd_dev_id(int minor) | |
449 | { | |
7e513d43 | 450 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
451 | } |
452 | ||
b15a21dd GKH |
453 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
454 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
455 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
456 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
b15a21dd GKH |
457 | |
458 | static struct attribute *rbd_bus_attrs[] = { | |
459 | &bus_attr_add.attr, | |
460 | &bus_attr_remove.attr, | |
9b60e70b ID |
461 | &bus_attr_add_single_major.attr, |
462 | &bus_attr_remove_single_major.attr, | |
b15a21dd | 463 | NULL, |
f0f8cef5 | 464 | }; |
92c76dc0 ID |
465 | |
466 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
467 | struct attribute *attr, int index) | |
468 | { | |
9b60e70b ID |
469 | if (!single_major && |
470 | (attr == &bus_attr_add_single_major.attr || | |
471 | attr == &bus_attr_remove_single_major.attr)) | |
472 | return 0; | |
473 | ||
92c76dc0 ID |
474 | return attr->mode; |
475 | } | |
476 | ||
477 | static const struct attribute_group rbd_bus_group = { | |
478 | .attrs = rbd_bus_attrs, | |
479 | .is_visible = rbd_bus_is_visible, | |
480 | }; | |
481 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
482 | |
483 | static struct bus_type rbd_bus_type = { | |
484 | .name = "rbd", | |
b15a21dd | 485 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
486 | }; |
487 | ||
488 | static void rbd_root_dev_release(struct device *dev) | |
489 | { | |
490 | } | |
491 | ||
492 | static struct device rbd_root_dev = { | |
493 | .init_name = "rbd", | |
494 | .release = rbd_root_dev_release, | |
495 | }; | |
496 | ||
06ecc6cb AE |
497 | static __printf(2, 3) |
498 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
499 | { | |
500 | struct va_format vaf; | |
501 | va_list args; | |
502 | ||
503 | va_start(args, fmt); | |
504 | vaf.fmt = fmt; | |
505 | vaf.va = &args; | |
506 | ||
507 | if (!rbd_dev) | |
508 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
509 | else if (rbd_dev->disk) | |
510 | printk(KERN_WARNING "%s: %s: %pV\n", | |
511 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
512 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
513 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
514 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
515 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
516 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
517 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
518 | else /* punt */ | |
519 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
520 | RBD_DRV_NAME, rbd_dev, &vaf); | |
521 | va_end(args); | |
522 | } | |
523 | ||
aafb230e AE |
524 | #ifdef RBD_DEBUG |
525 | #define rbd_assert(expr) \ | |
526 | if (unlikely(!(expr))) { \ | |
527 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
528 | "at line %d:\n\n" \ | |
529 | "\trbd_assert(%s);\n\n", \ | |
530 | __func__, __LINE__, #expr); \ | |
531 | BUG(); \ | |
532 | } | |
533 | #else /* !RBD_DEBUG */ | |
534 | # define rbd_assert(expr) ((void) 0) | |
535 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 536 | |
2761713d | 537 | static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); |
b454e36d | 538 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
539 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
540 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 541 | |
cc4a38bd | 542 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 543 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 544 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 545 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
546 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
547 | u64 snap_id); | |
2ad3d716 AE |
548 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
549 | u8 *order, u64 *snap_size); | |
550 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
551 | u64 *snap_features); | |
59c2be1e | 552 | |
602adf40 YS |
553 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
554 | { | |
f0f8cef5 | 555 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 556 | bool removing = false; |
602adf40 | 557 | |
f84344f3 | 558 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
559 | return -EROFS; |
560 | ||
a14ea269 | 561 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
562 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
563 | removing = true; | |
564 | else | |
565 | rbd_dev->open_count++; | |
a14ea269 | 566 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
567 | if (removing) |
568 | return -ENOENT; | |
569 | ||
c3e946ce | 570 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 571 | |
602adf40 YS |
572 | return 0; |
573 | } | |
574 | ||
db2a144b | 575 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
576 | { |
577 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
578 | unsigned long open_count_before; |
579 | ||
a14ea269 | 580 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 581 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 582 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 583 | rbd_assert(open_count_before > 0); |
dfc5606d | 584 | |
c3e946ce | 585 | put_device(&rbd_dev->dev); |
dfc5606d YS |
586 | } |
587 | ||
131fd9f6 GZ |
588 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
589 | { | |
77f33c03 | 590 | int ret = 0; |
131fd9f6 GZ |
591 | int val; |
592 | bool ro; | |
77f33c03 | 593 | bool ro_changed = false; |
131fd9f6 | 594 | |
77f33c03 | 595 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
131fd9f6 GZ |
596 | if (get_user(val, (int __user *)(arg))) |
597 | return -EFAULT; | |
598 | ||
599 | ro = val ? true : false; | |
600 | /* Snapshot doesn't allow to write*/ | |
601 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) | |
602 | return -EROFS; | |
603 | ||
77f33c03 JD |
604 | spin_lock_irq(&rbd_dev->lock); |
605 | /* prevent others open this device */ | |
606 | if (rbd_dev->open_count > 1) { | |
607 | ret = -EBUSY; | |
608 | goto out; | |
609 | } | |
610 | ||
131fd9f6 GZ |
611 | if (rbd_dev->mapping.read_only != ro) { |
612 | rbd_dev->mapping.read_only = ro; | |
77f33c03 | 613 | ro_changed = true; |
131fd9f6 GZ |
614 | } |
615 | ||
77f33c03 JD |
616 | out: |
617 | spin_unlock_irq(&rbd_dev->lock); | |
618 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ | |
619 | if (ret == 0 && ro_changed) | |
620 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); | |
621 | ||
622 | return ret; | |
131fd9f6 GZ |
623 | } |
624 | ||
625 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
626 | unsigned int cmd, unsigned long arg) | |
627 | { | |
628 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
629 | int ret = 0; | |
630 | ||
131fd9f6 GZ |
631 | switch (cmd) { |
632 | case BLKROSET: | |
633 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
634 | break; | |
635 | default: | |
636 | ret = -ENOTTY; | |
637 | } | |
638 | ||
131fd9f6 GZ |
639 | return ret; |
640 | } | |
641 | ||
642 | #ifdef CONFIG_COMPAT | |
643 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
644 | unsigned int cmd, unsigned long arg) | |
645 | { | |
646 | return rbd_ioctl(bdev, mode, cmd, arg); | |
647 | } | |
648 | #endif /* CONFIG_COMPAT */ | |
649 | ||
602adf40 YS |
650 | static const struct block_device_operations rbd_bd_ops = { |
651 | .owner = THIS_MODULE, | |
652 | .open = rbd_open, | |
dfc5606d | 653 | .release = rbd_release, |
131fd9f6 GZ |
654 | .ioctl = rbd_ioctl, |
655 | #ifdef CONFIG_COMPAT | |
656 | .compat_ioctl = rbd_compat_ioctl, | |
657 | #endif | |
602adf40 YS |
658 | }; |
659 | ||
660 | /* | |
7262cfca | 661 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 662 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 663 | */ |
f8c38929 | 664 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
665 | { |
666 | struct rbd_client *rbdc; | |
667 | int ret = -ENOMEM; | |
668 | ||
37206ee5 | 669 | dout("%s:\n", __func__); |
602adf40 YS |
670 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
671 | if (!rbdc) | |
672 | goto out_opt; | |
673 | ||
674 | kref_init(&rbdc->kref); | |
675 | INIT_LIST_HEAD(&rbdc->node); | |
676 | ||
43ae4701 | 677 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 678 | if (IS_ERR(rbdc->client)) |
08f75463 | 679 | goto out_rbdc; |
43ae4701 | 680 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
681 | |
682 | ret = ceph_open_session(rbdc->client); | |
683 | if (ret < 0) | |
08f75463 | 684 | goto out_client; |
602adf40 | 685 | |
432b8587 | 686 | spin_lock(&rbd_client_list_lock); |
602adf40 | 687 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 688 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 689 | |
37206ee5 | 690 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 691 | |
602adf40 | 692 | return rbdc; |
08f75463 | 693 | out_client: |
602adf40 | 694 | ceph_destroy_client(rbdc->client); |
08f75463 | 695 | out_rbdc: |
602adf40 YS |
696 | kfree(rbdc); |
697 | out_opt: | |
43ae4701 AE |
698 | if (ceph_opts) |
699 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
700 | dout("%s: error %d\n", __func__, ret); |
701 | ||
28f259b7 | 702 | return ERR_PTR(ret); |
602adf40 YS |
703 | } |
704 | ||
2f82ee54 AE |
705 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
706 | { | |
707 | kref_get(&rbdc->kref); | |
708 | ||
709 | return rbdc; | |
710 | } | |
711 | ||
602adf40 | 712 | /* |
1f7ba331 AE |
713 | * Find a ceph client with specific addr and configuration. If |
714 | * found, bump its reference count. | |
602adf40 | 715 | */ |
1f7ba331 | 716 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
717 | { |
718 | struct rbd_client *client_node; | |
1f7ba331 | 719 | bool found = false; |
602adf40 | 720 | |
43ae4701 | 721 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
722 | return NULL; |
723 | ||
1f7ba331 AE |
724 | spin_lock(&rbd_client_list_lock); |
725 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
726 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
727 | __rbd_get_client(client_node); |
728 | ||
1f7ba331 AE |
729 | found = true; |
730 | break; | |
731 | } | |
732 | } | |
733 | spin_unlock(&rbd_client_list_lock); | |
734 | ||
735 | return found ? client_node : NULL; | |
602adf40 YS |
736 | } |
737 | ||
59c2be1e | 738 | /* |
210c104c | 739 | * (Per device) rbd map options |
59c2be1e YS |
740 | */ |
741 | enum { | |
b5584180 | 742 | Opt_queue_depth, |
59c2be1e YS |
743 | Opt_last_int, |
744 | /* int args above */ | |
745 | Opt_last_string, | |
746 | /* string args above */ | |
cc0538b6 AE |
747 | Opt_read_only, |
748 | Opt_read_write, | |
210c104c | 749 | Opt_err |
59c2be1e YS |
750 | }; |
751 | ||
43ae4701 | 752 | static match_table_t rbd_opts_tokens = { |
b5584180 | 753 | {Opt_queue_depth, "queue_depth=%d"}, |
59c2be1e YS |
754 | /* int args above */ |
755 | /* string args above */ | |
be466c1c | 756 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
757 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
758 | {Opt_read_write, "read_write"}, | |
759 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
210c104c | 760 | {Opt_err, NULL} |
59c2be1e YS |
761 | }; |
762 | ||
98571b5a | 763 | struct rbd_options { |
b5584180 | 764 | int queue_depth; |
98571b5a AE |
765 | bool read_only; |
766 | }; | |
767 | ||
b5584180 | 768 | #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
98571b5a AE |
769 | #define RBD_READ_ONLY_DEFAULT false |
770 | ||
59c2be1e YS |
771 | static int parse_rbd_opts_token(char *c, void *private) |
772 | { | |
43ae4701 | 773 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
774 | substring_t argstr[MAX_OPT_ARGS]; |
775 | int token, intval, ret; | |
776 | ||
43ae4701 | 777 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
778 | if (token < Opt_last_int) { |
779 | ret = match_int(&argstr[0], &intval); | |
780 | if (ret < 0) { | |
210c104c | 781 | pr_err("bad mount option arg (not int) at '%s'\n", c); |
59c2be1e YS |
782 | return ret; |
783 | } | |
784 | dout("got int token %d val %d\n", token, intval); | |
785 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
210c104c | 786 | dout("got string token %d val %s\n", token, argstr[0].from); |
59c2be1e YS |
787 | } else { |
788 | dout("got token %d\n", token); | |
789 | } | |
790 | ||
791 | switch (token) { | |
b5584180 ID |
792 | case Opt_queue_depth: |
793 | if (intval < 1) { | |
794 | pr_err("queue_depth out of range\n"); | |
795 | return -EINVAL; | |
796 | } | |
797 | rbd_opts->queue_depth = intval; | |
798 | break; | |
cc0538b6 AE |
799 | case Opt_read_only: |
800 | rbd_opts->read_only = true; | |
801 | break; | |
802 | case Opt_read_write: | |
803 | rbd_opts->read_only = false; | |
804 | break; | |
59c2be1e | 805 | default: |
210c104c ID |
806 | /* libceph prints "bad option" msg */ |
807 | return -EINVAL; | |
59c2be1e | 808 | } |
210c104c | 809 | |
59c2be1e YS |
810 | return 0; |
811 | } | |
812 | ||
6d2940c8 GZ |
813 | static char* obj_op_name(enum obj_operation_type op_type) |
814 | { | |
815 | switch (op_type) { | |
816 | case OBJ_OP_READ: | |
817 | return "read"; | |
818 | case OBJ_OP_WRITE: | |
819 | return "write"; | |
90e98c52 GZ |
820 | case OBJ_OP_DISCARD: |
821 | return "discard"; | |
6d2940c8 GZ |
822 | default: |
823 | return "???"; | |
824 | } | |
825 | } | |
826 | ||
602adf40 YS |
827 | /* |
828 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
829 | * not exist create it. Either way, ceph_opts is consumed by this |
830 | * function. | |
602adf40 | 831 | */ |
9d3997fd | 832 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 833 | { |
f8c38929 | 834 | struct rbd_client *rbdc; |
59c2be1e | 835 | |
cfbf6377 | 836 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 837 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 838 | if (rbdc) /* using an existing client */ |
43ae4701 | 839 | ceph_destroy_options(ceph_opts); |
9d3997fd | 840 | else |
f8c38929 | 841 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 842 | mutex_unlock(&client_mutex); |
602adf40 | 843 | |
9d3997fd | 844 | return rbdc; |
602adf40 YS |
845 | } |
846 | ||
847 | /* | |
848 | * Destroy ceph client | |
d23a4b3f | 849 | * |
432b8587 | 850 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
851 | */ |
852 | static void rbd_client_release(struct kref *kref) | |
853 | { | |
854 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
855 | ||
37206ee5 | 856 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 857 | spin_lock(&rbd_client_list_lock); |
602adf40 | 858 | list_del(&rbdc->node); |
cd9d9f5d | 859 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
860 | |
861 | ceph_destroy_client(rbdc->client); | |
862 | kfree(rbdc); | |
863 | } | |
864 | ||
865 | /* | |
866 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
867 | * it. | |
868 | */ | |
9d3997fd | 869 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 870 | { |
c53d5893 AE |
871 | if (rbdc) |
872 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
873 | } |
874 | ||
a30b71b9 AE |
875 | static bool rbd_image_format_valid(u32 image_format) |
876 | { | |
877 | return image_format == 1 || image_format == 2; | |
878 | } | |
879 | ||
8e94af8e AE |
880 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
881 | { | |
103a150f AE |
882 | size_t size; |
883 | u32 snap_count; | |
884 | ||
885 | /* The header has to start with the magic rbd header text */ | |
886 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
887 | return false; | |
888 | ||
db2388b6 AE |
889 | /* The bio layer requires at least sector-sized I/O */ |
890 | ||
891 | if (ondisk->options.order < SECTOR_SHIFT) | |
892 | return false; | |
893 | ||
894 | /* If we use u64 in a few spots we may be able to loosen this */ | |
895 | ||
896 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
897 | return false; | |
898 | ||
103a150f AE |
899 | /* |
900 | * The size of a snapshot header has to fit in a size_t, and | |
901 | * that limits the number of snapshots. | |
902 | */ | |
903 | snap_count = le32_to_cpu(ondisk->snap_count); | |
904 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
905 | if (snap_count > size / sizeof (__le64)) | |
906 | return false; | |
907 | ||
908 | /* | |
909 | * Not only that, but the size of the entire the snapshot | |
910 | * header must also be representable in a size_t. | |
911 | */ | |
912 | size -= snap_count * sizeof (__le64); | |
913 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
914 | return false; | |
915 | ||
916 | return true; | |
8e94af8e AE |
917 | } |
918 | ||
602adf40 | 919 | /* |
bb23e37a AE |
920 | * Fill an rbd image header with information from the given format 1 |
921 | * on-disk header. | |
602adf40 | 922 | */ |
662518b1 | 923 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 924 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 925 | { |
662518b1 | 926 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
927 | bool first_time = header->object_prefix == NULL; |
928 | struct ceph_snap_context *snapc; | |
929 | char *object_prefix = NULL; | |
930 | char *snap_names = NULL; | |
931 | u64 *snap_sizes = NULL; | |
ccece235 | 932 | u32 snap_count; |
d2bb24e5 | 933 | size_t size; |
bb23e37a | 934 | int ret = -ENOMEM; |
621901d6 | 935 | u32 i; |
602adf40 | 936 | |
bb23e37a | 937 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 938 | |
bb23e37a AE |
939 | if (first_time) { |
940 | size_t len; | |
103a150f | 941 | |
bb23e37a AE |
942 | len = strnlen(ondisk->object_prefix, |
943 | sizeof (ondisk->object_prefix)); | |
944 | object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
945 | if (!object_prefix) | |
946 | return -ENOMEM; | |
947 | memcpy(object_prefix, ondisk->object_prefix, len); | |
948 | object_prefix[len] = '\0'; | |
949 | } | |
00f1f36f | 950 | |
bb23e37a | 951 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 952 | |
bb23e37a AE |
953 | snap_count = le32_to_cpu(ondisk->snap_count); |
954 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
955 | if (!snapc) | |
956 | goto out_err; | |
957 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 958 | if (snap_count) { |
bb23e37a | 959 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
960 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
961 | ||
bb23e37a | 962 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 963 | |
bb23e37a AE |
964 | if (snap_names_len > (u64)SIZE_MAX) |
965 | goto out_2big; | |
966 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
967 | if (!snap_names) | |
6a52325f AE |
968 | goto out_err; |
969 | ||
bb23e37a | 970 | /* ...as well as the array of their sizes. */ |
621901d6 | 971 | |
d2bb24e5 | 972 | size = snap_count * sizeof (*header->snap_sizes); |
bb23e37a AE |
973 | snap_sizes = kmalloc(size, GFP_KERNEL); |
974 | if (!snap_sizes) | |
6a52325f | 975 | goto out_err; |
bb23e37a | 976 | |
f785cc1d | 977 | /* |
bb23e37a AE |
978 | * Copy the names, and fill in each snapshot's id |
979 | * and size. | |
980 | * | |
99a41ebc | 981 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 982 | * ondisk buffer we're working with has |
f785cc1d AE |
983 | * snap_names_len bytes beyond the end of the |
984 | * snapshot id array, this memcpy() is safe. | |
985 | */ | |
bb23e37a AE |
986 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
987 | snaps = ondisk->snaps; | |
988 | for (i = 0; i < snap_count; i++) { | |
989 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
990 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
991 | } | |
602adf40 | 992 | } |
6a52325f | 993 | |
bb23e37a | 994 | /* We won't fail any more, fill in the header */ |
621901d6 | 995 | |
bb23e37a AE |
996 | if (first_time) { |
997 | header->object_prefix = object_prefix; | |
998 | header->obj_order = ondisk->options.order; | |
999 | header->crypt_type = ondisk->options.crypt_type; | |
1000 | header->comp_type = ondisk->options.comp_type; | |
1001 | /* The rest aren't used for format 1 images */ | |
1002 | header->stripe_unit = 0; | |
1003 | header->stripe_count = 0; | |
1004 | header->features = 0; | |
602adf40 | 1005 | } else { |
662518b1 AE |
1006 | ceph_put_snap_context(header->snapc); |
1007 | kfree(header->snap_names); | |
1008 | kfree(header->snap_sizes); | |
602adf40 | 1009 | } |
849b4260 | 1010 | |
bb23e37a | 1011 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 1012 | |
f84344f3 | 1013 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
1014 | header->snapc = snapc; |
1015 | header->snap_names = snap_names; | |
1016 | header->snap_sizes = snap_sizes; | |
468521c1 | 1017 | |
602adf40 | 1018 | return 0; |
bb23e37a AE |
1019 | out_2big: |
1020 | ret = -EIO; | |
6a52325f | 1021 | out_err: |
bb23e37a AE |
1022 | kfree(snap_sizes); |
1023 | kfree(snap_names); | |
1024 | ceph_put_snap_context(snapc); | |
1025 | kfree(object_prefix); | |
ccece235 | 1026 | |
bb23e37a | 1027 | return ret; |
602adf40 YS |
1028 | } |
1029 | ||
9682fc6d AE |
1030 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1031 | { | |
1032 | const char *snap_name; | |
1033 | ||
1034 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1035 | ||
1036 | /* Skip over names until we find the one we are looking for */ | |
1037 | ||
1038 | snap_name = rbd_dev->header.snap_names; | |
1039 | while (which--) | |
1040 | snap_name += strlen(snap_name) + 1; | |
1041 | ||
1042 | return kstrdup(snap_name, GFP_KERNEL); | |
1043 | } | |
1044 | ||
30d1cff8 AE |
1045 | /* |
1046 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1047 | * Note that result is for snapshots in *descending* order. | |
1048 | */ | |
1049 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1050 | { | |
1051 | u64 snap_id1 = *(u64 *)s1; | |
1052 | u64 snap_id2 = *(u64 *)s2; | |
1053 | ||
1054 | if (snap_id1 < snap_id2) | |
1055 | return 1; | |
1056 | return snap_id1 == snap_id2 ? 0 : -1; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Search a snapshot context to see if the given snapshot id is | |
1061 | * present. | |
1062 | * | |
1063 | * Returns the position of the snapshot id in the array if it's found, | |
1064 | * or BAD_SNAP_INDEX otherwise. | |
1065 | * | |
1066 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1067 | * reverse order, highest snapshot id first. | |
1068 | */ | |
9682fc6d AE |
1069 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1070 | { | |
1071 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1072 | u64 *found; |
9682fc6d | 1073 | |
30d1cff8 AE |
1074 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1075 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1076 | |
30d1cff8 | 1077 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1078 | } |
1079 | ||
2ad3d716 AE |
1080 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1081 | u64 snap_id) | |
9e15b77d | 1082 | { |
54cac61f | 1083 | u32 which; |
da6a6b63 | 1084 | const char *snap_name; |
9e15b77d | 1085 | |
54cac61f AE |
1086 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1087 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1088 | return ERR_PTR(-ENOENT); |
54cac61f | 1089 | |
da6a6b63 JD |
1090 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1091 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1092 | } |
1093 | ||
1094 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1095 | { | |
9e15b77d AE |
1096 | if (snap_id == CEPH_NOSNAP) |
1097 | return RBD_SNAP_HEAD_NAME; | |
1098 | ||
54cac61f AE |
1099 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1100 | if (rbd_dev->image_format == 1) | |
1101 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1102 | |
54cac61f | 1103 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1104 | } |
1105 | ||
2ad3d716 AE |
1106 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1107 | u64 *snap_size) | |
602adf40 | 1108 | { |
2ad3d716 AE |
1109 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1110 | if (snap_id == CEPH_NOSNAP) { | |
1111 | *snap_size = rbd_dev->header.image_size; | |
1112 | } else if (rbd_dev->image_format == 1) { | |
1113 | u32 which; | |
602adf40 | 1114 | |
2ad3d716 AE |
1115 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1116 | if (which == BAD_SNAP_INDEX) | |
1117 | return -ENOENT; | |
e86924a8 | 1118 | |
2ad3d716 AE |
1119 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1120 | } else { | |
1121 | u64 size = 0; | |
1122 | int ret; | |
1123 | ||
1124 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1125 | if (ret) | |
1126 | return ret; | |
1127 | ||
1128 | *snap_size = size; | |
1129 | } | |
1130 | return 0; | |
602adf40 YS |
1131 | } |
1132 | ||
2ad3d716 AE |
1133 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1134 | u64 *snap_features) | |
602adf40 | 1135 | { |
2ad3d716 AE |
1136 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1137 | if (snap_id == CEPH_NOSNAP) { | |
1138 | *snap_features = rbd_dev->header.features; | |
1139 | } else if (rbd_dev->image_format == 1) { | |
1140 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1141 | } else { |
2ad3d716 AE |
1142 | u64 features = 0; |
1143 | int ret; | |
8b0241f8 | 1144 | |
2ad3d716 AE |
1145 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1146 | if (ret) | |
1147 | return ret; | |
1148 | ||
1149 | *snap_features = features; | |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1155 | { | |
8f4b7d98 | 1156 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1157 | u64 size = 0; |
1158 | u64 features = 0; | |
1159 | int ret; | |
1160 | ||
2ad3d716 AE |
1161 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1162 | if (ret) | |
1163 | return ret; | |
1164 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1165 | if (ret) | |
1166 | return ret; | |
1167 | ||
1168 | rbd_dev->mapping.size = size; | |
1169 | rbd_dev->mapping.features = features; | |
1170 | ||
8b0241f8 | 1171 | return 0; |
602adf40 YS |
1172 | } |
1173 | ||
d1cf5788 AE |
1174 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1175 | { | |
1176 | rbd_dev->mapping.size = 0; | |
1177 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1178 | } |
1179 | ||
7d5079aa HS |
1180 | static void rbd_segment_name_free(const char *name) |
1181 | { | |
1182 | /* The explicit cast here is needed to drop the const qualifier */ | |
1183 | ||
1184 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
1185 | } | |
1186 | ||
98571b5a | 1187 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 1188 | { |
65ccfe21 AE |
1189 | char *name; |
1190 | u64 segment; | |
1191 | int ret; | |
3a96d5cd | 1192 | char *name_format; |
602adf40 | 1193 | |
78c2a44a | 1194 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
1195 | if (!name) |
1196 | return NULL; | |
1197 | segment = offset >> rbd_dev->header.obj_order; | |
3a96d5cd JD |
1198 | name_format = "%s.%012llx"; |
1199 | if (rbd_dev->image_format == 2) | |
1200 | name_format = "%s.%016llx"; | |
2d0ebc5d | 1201 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
65ccfe21 | 1202 | rbd_dev->header.object_prefix, segment); |
2d0ebc5d | 1203 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
65ccfe21 AE |
1204 | pr_err("error formatting segment name for #%llu (%d)\n", |
1205 | segment, ret); | |
7d5079aa | 1206 | rbd_segment_name_free(name); |
65ccfe21 AE |
1207 | name = NULL; |
1208 | } | |
602adf40 | 1209 | |
65ccfe21 AE |
1210 | return name; |
1211 | } | |
602adf40 | 1212 | |
65ccfe21 AE |
1213 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1214 | { | |
1215 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 1216 | |
65ccfe21 AE |
1217 | return offset & (segment_size - 1); |
1218 | } | |
1219 | ||
1220 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1221 | u64 offset, u64 length) | |
1222 | { | |
1223 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1224 | ||
1225 | offset &= segment_size - 1; | |
1226 | ||
aafb230e | 1227 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1228 | if (offset + length > segment_size) |
1229 | length = segment_size - offset; | |
1230 | ||
1231 | return length; | |
602adf40 YS |
1232 | } |
1233 | ||
029bcbd8 JD |
1234 | /* |
1235 | * returns the size of an object in the image | |
1236 | */ | |
1237 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1238 | { | |
1239 | return 1 << header->obj_order; | |
1240 | } | |
1241 | ||
602adf40 YS |
1242 | /* |
1243 | * bio helpers | |
1244 | */ | |
1245 | ||
1246 | static void bio_chain_put(struct bio *chain) | |
1247 | { | |
1248 | struct bio *tmp; | |
1249 | ||
1250 | while (chain) { | |
1251 | tmp = chain; | |
1252 | chain = chain->bi_next; | |
1253 | bio_put(tmp); | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * zeros a bio chain, starting at specific offset | |
1259 | */ | |
1260 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1261 | { | |
7988613b KO |
1262 | struct bio_vec bv; |
1263 | struct bvec_iter iter; | |
602adf40 YS |
1264 | unsigned long flags; |
1265 | void *buf; | |
602adf40 YS |
1266 | int pos = 0; |
1267 | ||
1268 | while (chain) { | |
7988613b KO |
1269 | bio_for_each_segment(bv, chain, iter) { |
1270 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1271 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1272 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1273 | memset(buf + remainder, 0, |
7988613b KO |
1274 | bv.bv_len - remainder); |
1275 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1276 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1277 | } |
7988613b | 1278 | pos += bv.bv_len; |
602adf40 YS |
1279 | } |
1280 | ||
1281 | chain = chain->bi_next; | |
1282 | } | |
1283 | } | |
1284 | ||
b9434c5b AE |
1285 | /* |
1286 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1287 | * starting at the given byte offset from the start of the array and | |
1288 | * continuing up to the given end offset. The pages array is | |
1289 | * assumed to be big enough to hold all bytes up to the end. | |
1290 | */ | |
1291 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1292 | { | |
1293 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1294 | ||
1295 | rbd_assert(end > offset); | |
1296 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1297 | while (offset < end) { | |
1298 | size_t page_offset; | |
1299 | size_t length; | |
1300 | unsigned long flags; | |
1301 | void *kaddr; | |
1302 | ||
491205a8 GU |
1303 | page_offset = offset & ~PAGE_MASK; |
1304 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1305 | local_irq_save(flags); |
1306 | kaddr = kmap_atomic(*page); | |
1307 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1308 | flush_dcache_page(*page); |
b9434c5b AE |
1309 | kunmap_atomic(kaddr); |
1310 | local_irq_restore(flags); | |
1311 | ||
1312 | offset += length; | |
1313 | page++; | |
1314 | } | |
1315 | } | |
1316 | ||
602adf40 | 1317 | /* |
f7760dad AE |
1318 | * Clone a portion of a bio, starting at the given byte offset |
1319 | * and continuing for the number of bytes indicated. | |
602adf40 | 1320 | */ |
f7760dad AE |
1321 | static struct bio *bio_clone_range(struct bio *bio_src, |
1322 | unsigned int offset, | |
1323 | unsigned int len, | |
1324 | gfp_t gfpmask) | |
602adf40 | 1325 | { |
f7760dad AE |
1326 | struct bio *bio; |
1327 | ||
5341a627 | 1328 | bio = bio_clone(bio_src, gfpmask); |
f7760dad AE |
1329 | if (!bio) |
1330 | return NULL; /* ENOMEM */ | |
602adf40 | 1331 | |
5341a627 | 1332 | bio_advance(bio, offset); |
4f024f37 | 1333 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1334 | |
1335 | return bio; | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Clone a portion of a bio chain, starting at the given byte offset | |
1340 | * into the first bio in the source chain and continuing for the | |
1341 | * number of bytes indicated. The result is another bio chain of | |
1342 | * exactly the given length, or a null pointer on error. | |
1343 | * | |
1344 | * The bio_src and offset parameters are both in-out. On entry they | |
1345 | * refer to the first source bio and the offset into that bio where | |
1346 | * the start of data to be cloned is located. | |
1347 | * | |
1348 | * On return, bio_src is updated to refer to the bio in the source | |
1349 | * chain that contains first un-cloned byte, and *offset will | |
1350 | * contain the offset of that byte within that bio. | |
1351 | */ | |
1352 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1353 | unsigned int *offset, | |
1354 | unsigned int len, | |
1355 | gfp_t gfpmask) | |
1356 | { | |
1357 | struct bio *bi = *bio_src; | |
1358 | unsigned int off = *offset; | |
1359 | struct bio *chain = NULL; | |
1360 | struct bio **end; | |
1361 | ||
1362 | /* Build up a chain of clone bios up to the limit */ | |
1363 | ||
4f024f37 | 1364 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1365 | return NULL; /* Nothing to clone */ |
602adf40 | 1366 | |
f7760dad AE |
1367 | end = &chain; |
1368 | while (len) { | |
1369 | unsigned int bi_size; | |
1370 | struct bio *bio; | |
1371 | ||
f5400b7a AE |
1372 | if (!bi) { |
1373 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1374 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1375 | } |
4f024f37 | 1376 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1377 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1378 | if (!bio) | |
1379 | goto out_err; /* ENOMEM */ | |
1380 | ||
1381 | *end = bio; | |
1382 | end = &bio->bi_next; | |
602adf40 | 1383 | |
f7760dad | 1384 | off += bi_size; |
4f024f37 | 1385 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1386 | bi = bi->bi_next; |
1387 | off = 0; | |
1388 | } | |
1389 | len -= bi_size; | |
1390 | } | |
1391 | *bio_src = bi; | |
1392 | *offset = off; | |
1393 | ||
1394 | return chain; | |
1395 | out_err: | |
1396 | bio_chain_put(chain); | |
602adf40 | 1397 | |
602adf40 YS |
1398 | return NULL; |
1399 | } | |
1400 | ||
926f9b3f AE |
1401 | /* |
1402 | * The default/initial value for all object request flags is 0. For | |
1403 | * each flag, once its value is set to 1 it is never reset to 0 | |
1404 | * again. | |
1405 | */ | |
57acbaa7 | 1406 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1407 | { |
57acbaa7 | 1408 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1409 | struct rbd_device *rbd_dev; |
1410 | ||
57acbaa7 | 1411 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1412 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1413 | obj_request); |
1414 | } | |
1415 | } | |
1416 | ||
57acbaa7 | 1417 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1418 | { |
1419 | smp_mb(); | |
57acbaa7 | 1420 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1421 | } |
1422 | ||
57acbaa7 | 1423 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1424 | { |
57acbaa7 AE |
1425 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1426 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1427 | |
57acbaa7 AE |
1428 | if (obj_request_img_data_test(obj_request)) |
1429 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1430 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1431 | obj_request); |
1432 | } | |
1433 | } | |
1434 | ||
57acbaa7 | 1435 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1436 | { |
1437 | smp_mb(); | |
57acbaa7 | 1438 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1439 | } |
1440 | ||
5679c59f AE |
1441 | /* |
1442 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1443 | * flag. The latter is set based on the "exists" value provided. | |
1444 | * | |
1445 | * Note that for our purposes once an object exists it never goes | |
1446 | * away again. It's possible that the response from two existence | |
1447 | * checks are separated by the creation of the target object, and | |
1448 | * the first ("doesn't exist") response arrives *after* the second | |
1449 | * ("does exist"). In that case we ignore the second one. | |
1450 | */ | |
1451 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1452 | bool exists) | |
1453 | { | |
1454 | if (exists) | |
1455 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1456 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1457 | smp_mb(); | |
1458 | } | |
1459 | ||
1460 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1461 | { | |
1462 | smp_mb(); | |
1463 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1464 | } | |
1465 | ||
1466 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1467 | { | |
1468 | smp_mb(); | |
1469 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1470 | } | |
1471 | ||
9638556a ID |
1472 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1473 | { | |
1474 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1475 | ||
1476 | return obj_request->img_offset < | |
1477 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1478 | } | |
1479 | ||
bf0d5f50 AE |
1480 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1481 | { | |
37206ee5 AE |
1482 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1483 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1484 | kref_get(&obj_request->kref); |
1485 | } | |
1486 | ||
1487 | static void rbd_obj_request_destroy(struct kref *kref); | |
1488 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1489 | { | |
1490 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1491 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1492 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1493 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1494 | } | |
1495 | ||
0f2d5be7 AE |
1496 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1497 | { | |
1498 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
1499 | atomic_read(&img_request->kref.refcount)); | |
1500 | kref_get(&img_request->kref); | |
1501 | } | |
1502 | ||
e93f3152 AE |
1503 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1504 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1505 | static void rbd_img_request_destroy(struct kref *kref); |
1506 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1507 | { | |
1508 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1509 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1510 | atomic_read(&img_request->kref.refcount)); | |
e93f3152 AE |
1511 | if (img_request_child_test(img_request)) |
1512 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1513 | else | |
1514 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1515 | } |
1516 | ||
1517 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1518 | struct rbd_obj_request *obj_request) | |
1519 | { | |
25dcf954 AE |
1520 | rbd_assert(obj_request->img_request == NULL); |
1521 | ||
b155e86c | 1522 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1523 | obj_request->img_request = img_request; |
25dcf954 | 1524 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1525 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1526 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1527 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1528 | img_request->obj_request_count++; |
1529 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1530 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1531 | obj_request->which); | |
bf0d5f50 AE |
1532 | } |
1533 | ||
1534 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1535 | struct rbd_obj_request *obj_request) | |
1536 | { | |
1537 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1538 | |
37206ee5 AE |
1539 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1540 | obj_request->which); | |
bf0d5f50 | 1541 | list_del(&obj_request->links); |
25dcf954 AE |
1542 | rbd_assert(img_request->obj_request_count > 0); |
1543 | img_request->obj_request_count--; | |
1544 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1545 | obj_request->which = BAD_WHICH; | |
6365d33a | 1546 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1547 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1548 | obj_request->img_request = NULL; |
25dcf954 | 1549 | obj_request->callback = NULL; |
bf0d5f50 AE |
1550 | rbd_obj_request_put(obj_request); |
1551 | } | |
1552 | ||
1553 | static bool obj_request_type_valid(enum obj_request_type type) | |
1554 | { | |
1555 | switch (type) { | |
9969ebc5 | 1556 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1557 | case OBJ_REQUEST_BIO: |
788e2df3 | 1558 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1559 | return true; |
1560 | default: | |
1561 | return false; | |
1562 | } | |
1563 | } | |
1564 | ||
bf0d5f50 AE |
1565 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1566 | struct rbd_obj_request *obj_request) | |
1567 | { | |
71c20a06 | 1568 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1569 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1570 | } | |
1571 | ||
71c20a06 ID |
1572 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
1573 | { | |
1574 | dout("%s %p\n", __func__, obj_request); | |
1575 | ceph_osdc_cancel_request(obj_request->osd_req); | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Wait for an object request to complete. If interrupted, cancel the | |
1580 | * underlying osd request. | |
2894e1d7 ID |
1581 | * |
1582 | * @timeout: in jiffies, 0 means "wait forever" | |
71c20a06 | 1583 | */ |
2894e1d7 ID |
1584 | static int __rbd_obj_request_wait(struct rbd_obj_request *obj_request, |
1585 | unsigned long timeout) | |
71c20a06 | 1586 | { |
2894e1d7 | 1587 | long ret; |
71c20a06 ID |
1588 | |
1589 | dout("%s %p\n", __func__, obj_request); | |
2894e1d7 ID |
1590 | ret = wait_for_completion_interruptible_timeout( |
1591 | &obj_request->completion, | |
1592 | ceph_timeout_jiffies(timeout)); | |
1593 | if (ret <= 0) { | |
1594 | if (ret == 0) | |
1595 | ret = -ETIMEDOUT; | |
71c20a06 | 1596 | rbd_obj_request_end(obj_request); |
2894e1d7 ID |
1597 | } else { |
1598 | ret = 0; | |
71c20a06 ID |
1599 | } |
1600 | ||
2894e1d7 ID |
1601 | dout("%s %p ret %d\n", __func__, obj_request, (int)ret); |
1602 | return ret; | |
1603 | } | |
1604 | ||
1605 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1606 | { | |
1607 | return __rbd_obj_request_wait(obj_request, 0); | |
1608 | } | |
1609 | ||
bf0d5f50 AE |
1610 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1611 | { | |
55f27e09 | 1612 | |
37206ee5 | 1613 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1614 | |
1615 | /* | |
1616 | * If no error occurred, compute the aggregate transfer | |
1617 | * count for the image request. We could instead use | |
1618 | * atomic64_cmpxchg() to update it as each object request | |
1619 | * completes; not clear which way is better off hand. | |
1620 | */ | |
1621 | if (!img_request->result) { | |
1622 | struct rbd_obj_request *obj_request; | |
1623 | u64 xferred = 0; | |
1624 | ||
1625 | for_each_obj_request(img_request, obj_request) | |
1626 | xferred += obj_request->xferred; | |
1627 | img_request->xferred = xferred; | |
1628 | } | |
1629 | ||
bf0d5f50 AE |
1630 | if (img_request->callback) |
1631 | img_request->callback(img_request); | |
1632 | else | |
1633 | rbd_img_request_put(img_request); | |
1634 | } | |
1635 | ||
0c425248 AE |
1636 | /* |
1637 | * The default/initial value for all image request flags is 0. Each | |
1638 | * is conditionally set to 1 at image request initialization time | |
1639 | * and currently never change thereafter. | |
1640 | */ | |
1641 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1642 | { | |
1643 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1644 | smp_mb(); | |
1645 | } | |
1646 | ||
1647 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1648 | { | |
1649 | smp_mb(); | |
1650 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1651 | } | |
1652 | ||
90e98c52 GZ |
1653 | /* |
1654 | * Set the discard flag when the img_request is an discard request | |
1655 | */ | |
1656 | static void img_request_discard_set(struct rbd_img_request *img_request) | |
1657 | { | |
1658 | set_bit(IMG_REQ_DISCARD, &img_request->flags); | |
1659 | smp_mb(); | |
1660 | } | |
1661 | ||
1662 | static bool img_request_discard_test(struct rbd_img_request *img_request) | |
1663 | { | |
1664 | smp_mb(); | |
1665 | return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; | |
1666 | } | |
1667 | ||
9849e986 AE |
1668 | static void img_request_child_set(struct rbd_img_request *img_request) |
1669 | { | |
1670 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1671 | smp_mb(); | |
1672 | } | |
1673 | ||
e93f3152 AE |
1674 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1675 | { | |
1676 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1677 | smp_mb(); | |
1678 | } | |
1679 | ||
9849e986 AE |
1680 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1681 | { | |
1682 | smp_mb(); | |
1683 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1684 | } | |
1685 | ||
d0b2e944 AE |
1686 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1687 | { | |
1688 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1689 | smp_mb(); | |
1690 | } | |
1691 | ||
a2acd00e AE |
1692 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1693 | { | |
1694 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1695 | smp_mb(); | |
1696 | } | |
1697 | ||
d0b2e944 AE |
1698 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1699 | { | |
1700 | smp_mb(); | |
1701 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1702 | } | |
1703 | ||
3b434a2a JD |
1704 | static enum obj_operation_type |
1705 | rbd_img_request_op_type(struct rbd_img_request *img_request) | |
1706 | { | |
1707 | if (img_request_write_test(img_request)) | |
1708 | return OBJ_OP_WRITE; | |
1709 | else if (img_request_discard_test(img_request)) | |
1710 | return OBJ_OP_DISCARD; | |
1711 | else | |
1712 | return OBJ_OP_READ; | |
1713 | } | |
1714 | ||
6e2a4505 AE |
1715 | static void |
1716 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1717 | { | |
b9434c5b AE |
1718 | u64 xferred = obj_request->xferred; |
1719 | u64 length = obj_request->length; | |
1720 | ||
6e2a4505 AE |
1721 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1722 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1723 | xferred, length); |
6e2a4505 | 1724 | /* |
17c1cc1d JD |
1725 | * ENOENT means a hole in the image. We zero-fill the entire |
1726 | * length of the request. A short read also implies zero-fill | |
1727 | * to the end of the request. An error requires the whole | |
1728 | * length of the request to be reported finished with an error | |
1729 | * to the block layer. In each case we update the xferred | |
1730 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1731 | */ |
b9434c5b | 1732 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1733 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1734 | if (obj_request->type == OBJ_REQUEST_BIO) |
1735 | zero_bio_chain(obj_request->bio_list, 0); | |
1736 | else | |
1737 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1738 | obj_request->result = 0; |
b9434c5b AE |
1739 | } else if (xferred < length && !obj_request->result) { |
1740 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1741 | zero_bio_chain(obj_request->bio_list, xferred); | |
1742 | else | |
1743 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1744 | } |
17c1cc1d | 1745 | obj_request->xferred = length; |
6e2a4505 AE |
1746 | obj_request_done_set(obj_request); |
1747 | } | |
1748 | ||
bf0d5f50 AE |
1749 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1750 | { | |
37206ee5 AE |
1751 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1752 | obj_request->callback); | |
bf0d5f50 AE |
1753 | if (obj_request->callback) |
1754 | obj_request->callback(obj_request); | |
788e2df3 AE |
1755 | else |
1756 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1757 | } |
1758 | ||
c47f9371 | 1759 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1760 | { |
57acbaa7 | 1761 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1762 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1763 | bool layered = false; |
1764 | ||
1765 | if (obj_request_img_data_test(obj_request)) { | |
1766 | img_request = obj_request->img_request; | |
1767 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1768 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1769 | } |
8b3e1a56 AE |
1770 | |
1771 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1772 | obj_request, img_request, obj_request->result, | |
1773 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1774 | if (layered && obj_request->result == -ENOENT && |
1775 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1776 | rbd_img_parent_read(obj_request); |
1777 | else if (img_request) | |
6e2a4505 AE |
1778 | rbd_img_obj_request_read_callback(obj_request); |
1779 | else | |
1780 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1781 | } |
1782 | ||
c47f9371 | 1783 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1784 | { |
1b83bef2 SW |
1785 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1786 | obj_request->result, obj_request->length); | |
1787 | /* | |
8b3e1a56 AE |
1788 | * There is no such thing as a successful short write. Set |
1789 | * it to our originally-requested length. | |
1b83bef2 SW |
1790 | */ |
1791 | obj_request->xferred = obj_request->length; | |
07741308 | 1792 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1793 | } |
1794 | ||
90e98c52 GZ |
1795 | static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
1796 | { | |
1797 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, | |
1798 | obj_request->result, obj_request->length); | |
1799 | /* | |
1800 | * There is no such thing as a successful short discard. Set | |
1801 | * it to our originally-requested length. | |
1802 | */ | |
1803 | obj_request->xferred = obj_request->length; | |
d0265de7 JD |
1804 | /* discarding a non-existent object is not a problem */ |
1805 | if (obj_request->result == -ENOENT) | |
1806 | obj_request->result = 0; | |
90e98c52 GZ |
1807 | obj_request_done_set(obj_request); |
1808 | } | |
1809 | ||
fbfab539 AE |
1810 | /* |
1811 | * For a simple stat call there's nothing to do. We'll do more if | |
1812 | * this is part of a write sequence for a layered image. | |
1813 | */ | |
c47f9371 | 1814 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1815 | { |
37206ee5 | 1816 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1817 | obj_request_done_set(obj_request); |
1818 | } | |
1819 | ||
2761713d ID |
1820 | static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) |
1821 | { | |
1822 | dout("%s: obj %p\n", __func__, obj_request); | |
1823 | ||
1824 | if (obj_request_img_data_test(obj_request)) | |
1825 | rbd_osd_copyup_callback(obj_request); | |
1826 | else | |
1827 | obj_request_done_set(obj_request); | |
1828 | } | |
1829 | ||
85e084fe | 1830 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
bf0d5f50 AE |
1831 | { |
1832 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1833 | u16 opcode; |
1834 | ||
85e084fe | 1835 | dout("%s: osd_req %p\n", __func__, osd_req); |
bf0d5f50 | 1836 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1837 | if (obj_request_img_data_test(obj_request)) { |
1838 | rbd_assert(obj_request->img_request); | |
1839 | rbd_assert(obj_request->which != BAD_WHICH); | |
1840 | } else { | |
1841 | rbd_assert(obj_request->which == BAD_WHICH); | |
1842 | } | |
bf0d5f50 | 1843 | |
1b83bef2 SW |
1844 | if (osd_req->r_result < 0) |
1845 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1846 | |
c47f9371 AE |
1847 | /* |
1848 | * We support a 64-bit length, but ultimately it has to be | |
7ad18afa CH |
1849 | * passed to the block layer, which just supports a 32-bit |
1850 | * length field. | |
c47f9371 | 1851 | */ |
7665d85b | 1852 | obj_request->xferred = osd_req->r_ops[0].outdata_len; |
8b3e1a56 | 1853 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1854 | |
79528734 | 1855 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1856 | switch (opcode) { |
1857 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1858 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1859 | break; |
0ccd5926 | 1860 | case CEPH_OSD_OP_SETALLOCHINT: |
e30b7577 ID |
1861 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE || |
1862 | osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL); | |
0ccd5926 | 1863 | /* fall through */ |
bf0d5f50 | 1864 | case CEPH_OSD_OP_WRITE: |
e30b7577 | 1865 | case CEPH_OSD_OP_WRITEFULL: |
c47f9371 | 1866 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1867 | break; |
fbfab539 | 1868 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1869 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1870 | break; |
90e98c52 GZ |
1871 | case CEPH_OSD_OP_DELETE: |
1872 | case CEPH_OSD_OP_TRUNCATE: | |
1873 | case CEPH_OSD_OP_ZERO: | |
1874 | rbd_osd_discard_callback(obj_request); | |
1875 | break; | |
36be9a76 | 1876 | case CEPH_OSD_OP_CALL: |
2761713d ID |
1877 | rbd_osd_call_callback(obj_request); |
1878 | break; | |
bf0d5f50 | 1879 | default: |
9584d508 | 1880 | rbd_warn(NULL, "%s: unsupported op %hu", |
bf0d5f50 AE |
1881 | obj_request->object_name, (unsigned short) opcode); |
1882 | break; | |
1883 | } | |
1884 | ||
07741308 | 1885 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1886 | rbd_obj_request_complete(obj_request); |
1887 | } | |
1888 | ||
9d4df01f | 1889 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1890 | { |
1891 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1892 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
430c28c3 | 1893 | |
bb873b53 ID |
1894 | if (img_request) |
1895 | osd_req->r_snapid = img_request->snap_id; | |
9d4df01f AE |
1896 | } |
1897 | ||
1898 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1899 | { | |
9d4df01f | 1900 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1901 | |
bb873b53 ID |
1902 | osd_req->r_mtime = CURRENT_TIME; |
1903 | osd_req->r_data_offset = obj_request->offset; | |
430c28c3 AE |
1904 | } |
1905 | ||
0ccd5926 ID |
1906 | /* |
1907 | * Create an osd request. A read request has one osd op (read). | |
1908 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1909 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1910 | * technically osd watch is a write request, hence this distinction.) | |
1911 | */ | |
bf0d5f50 AE |
1912 | static struct ceph_osd_request *rbd_osd_req_create( |
1913 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1914 | enum obj_operation_type op_type, |
deb236b3 | 1915 | unsigned int num_ops, |
430c28c3 | 1916 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1917 | { |
bf0d5f50 AE |
1918 | struct ceph_snap_context *snapc = NULL; |
1919 | struct ceph_osd_client *osdc; | |
1920 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1921 | |
90e98c52 GZ |
1922 | if (obj_request_img_data_test(obj_request) && |
1923 | (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { | |
6365d33a | 1924 | struct rbd_img_request *img_request = obj_request->img_request; |
90e98c52 GZ |
1925 | if (op_type == OBJ_OP_WRITE) { |
1926 | rbd_assert(img_request_write_test(img_request)); | |
1927 | } else { | |
1928 | rbd_assert(img_request_discard_test(img_request)); | |
1929 | } | |
6d2940c8 | 1930 | snapc = img_request->snapc; |
bf0d5f50 AE |
1931 | } |
1932 | ||
6d2940c8 | 1933 | rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
deb236b3 ID |
1934 | |
1935 | /* Allocate and initialize the request, for the num_ops ops */ | |
bf0d5f50 AE |
1936 | |
1937 | osdc = &rbd_dev->rbd_client->client->osdc; | |
deb236b3 | 1938 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
2224d879 | 1939 | GFP_NOIO); |
bf0d5f50 | 1940 | if (!osd_req) |
13d1ad16 | 1941 | goto fail; |
bf0d5f50 | 1942 | |
90e98c52 | 1943 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
bf0d5f50 | 1944 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1945 | else |
bf0d5f50 | 1946 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1947 | |
1948 | osd_req->r_callback = rbd_osd_req_callback; | |
1949 | osd_req->r_priv = obj_request; | |
1950 | ||
7627151e | 1951 | osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
d30291b9 ID |
1952 | if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s", |
1953 | obj_request->object_name)) | |
1954 | goto fail; | |
bf0d5f50 | 1955 | |
13d1ad16 ID |
1956 | if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO)) |
1957 | goto fail; | |
1958 | ||
bf0d5f50 | 1959 | return osd_req; |
13d1ad16 ID |
1960 | |
1961 | fail: | |
1962 | ceph_osdc_put_request(osd_req); | |
1963 | return NULL; | |
bf0d5f50 AE |
1964 | } |
1965 | ||
0eefd470 | 1966 | /* |
d3246fb0 JD |
1967 | * Create a copyup osd request based on the information in the object |
1968 | * request supplied. A copyup request has two or three osd ops, a | |
1969 | * copyup method call, potentially a hint op, and a write or truncate | |
1970 | * or zero op. | |
0eefd470 AE |
1971 | */ |
1972 | static struct ceph_osd_request * | |
1973 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1974 | { | |
1975 | struct rbd_img_request *img_request; | |
1976 | struct ceph_snap_context *snapc; | |
1977 | struct rbd_device *rbd_dev; | |
1978 | struct ceph_osd_client *osdc; | |
1979 | struct ceph_osd_request *osd_req; | |
d3246fb0 | 1980 | int num_osd_ops = 3; |
0eefd470 AE |
1981 | |
1982 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1983 | img_request = obj_request->img_request; | |
1984 | rbd_assert(img_request); | |
d3246fb0 JD |
1985 | rbd_assert(img_request_write_test(img_request) || |
1986 | img_request_discard_test(img_request)); | |
0eefd470 | 1987 | |
d3246fb0 JD |
1988 | if (img_request_discard_test(img_request)) |
1989 | num_osd_ops = 2; | |
1990 | ||
1991 | /* Allocate and initialize the request, for all the ops */ | |
0eefd470 AE |
1992 | |
1993 | snapc = img_request->snapc; | |
1994 | rbd_dev = img_request->rbd_dev; | |
1995 | osdc = &rbd_dev->rbd_client->client->osdc; | |
d3246fb0 | 1996 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops, |
2224d879 | 1997 | false, GFP_NOIO); |
0eefd470 | 1998 | if (!osd_req) |
13d1ad16 | 1999 | goto fail; |
0eefd470 AE |
2000 | |
2001 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
2002 | osd_req->r_callback = rbd_osd_req_callback; | |
2003 | osd_req->r_priv = obj_request; | |
2004 | ||
7627151e | 2005 | osd_req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
d30291b9 ID |
2006 | if (ceph_oid_aprintf(&osd_req->r_base_oid, GFP_NOIO, "%s", |
2007 | obj_request->object_name)) | |
2008 | goto fail; | |
0eefd470 | 2009 | |
13d1ad16 ID |
2010 | if (ceph_osdc_alloc_messages(osd_req, GFP_NOIO)) |
2011 | goto fail; | |
2012 | ||
0eefd470 | 2013 | return osd_req; |
13d1ad16 ID |
2014 | |
2015 | fail: | |
2016 | ceph_osdc_put_request(osd_req); | |
2017 | return NULL; | |
0eefd470 AE |
2018 | } |
2019 | ||
2020 | ||
bf0d5f50 AE |
2021 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
2022 | { | |
2023 | ceph_osdc_put_request(osd_req); | |
2024 | } | |
2025 | ||
2026 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
2027 | ||
2028 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
2029 | u64 offset, u64 length, | |
2030 | enum obj_request_type type) | |
2031 | { | |
2032 | struct rbd_obj_request *obj_request; | |
2033 | size_t size; | |
2034 | char *name; | |
2035 | ||
2036 | rbd_assert(obj_request_type_valid(type)); | |
2037 | ||
2038 | size = strlen(object_name) + 1; | |
5a60e876 | 2039 | name = kmalloc(size, GFP_NOIO); |
f907ad55 | 2040 | if (!name) |
bf0d5f50 AE |
2041 | return NULL; |
2042 | ||
5a60e876 | 2043 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
f907ad55 AE |
2044 | if (!obj_request) { |
2045 | kfree(name); | |
2046 | return NULL; | |
2047 | } | |
2048 | ||
bf0d5f50 AE |
2049 | obj_request->object_name = memcpy(name, object_name, size); |
2050 | obj_request->offset = offset; | |
2051 | obj_request->length = length; | |
926f9b3f | 2052 | obj_request->flags = 0; |
bf0d5f50 AE |
2053 | obj_request->which = BAD_WHICH; |
2054 | obj_request->type = type; | |
2055 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 2056 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
2057 | kref_init(&obj_request->kref); |
2058 | ||
37206ee5 AE |
2059 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
2060 | offset, length, (int)type, obj_request); | |
2061 | ||
bf0d5f50 AE |
2062 | return obj_request; |
2063 | } | |
2064 | ||
2065 | static void rbd_obj_request_destroy(struct kref *kref) | |
2066 | { | |
2067 | struct rbd_obj_request *obj_request; | |
2068 | ||
2069 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
2070 | ||
37206ee5 AE |
2071 | dout("%s: obj %p\n", __func__, obj_request); |
2072 | ||
bf0d5f50 AE |
2073 | rbd_assert(obj_request->img_request == NULL); |
2074 | rbd_assert(obj_request->which == BAD_WHICH); | |
2075 | ||
2076 | if (obj_request->osd_req) | |
2077 | rbd_osd_req_destroy(obj_request->osd_req); | |
2078 | ||
2079 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
2080 | switch (obj_request->type) { | |
9969ebc5 AE |
2081 | case OBJ_REQUEST_NODATA: |
2082 | break; /* Nothing to do */ | |
bf0d5f50 AE |
2083 | case OBJ_REQUEST_BIO: |
2084 | if (obj_request->bio_list) | |
2085 | bio_chain_put(obj_request->bio_list); | |
2086 | break; | |
788e2df3 AE |
2087 | case OBJ_REQUEST_PAGES: |
2088 | if (obj_request->pages) | |
2089 | ceph_release_page_vector(obj_request->pages, | |
2090 | obj_request->page_count); | |
2091 | break; | |
bf0d5f50 AE |
2092 | } |
2093 | ||
f907ad55 | 2094 | kfree(obj_request->object_name); |
868311b1 AE |
2095 | obj_request->object_name = NULL; |
2096 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
2097 | } |
2098 | ||
fb65d228 AE |
2099 | /* It's OK to call this for a device with no parent */ |
2100 | ||
2101 | static void rbd_spec_put(struct rbd_spec *spec); | |
2102 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
2103 | { | |
2104 | rbd_dev_remove_parent(rbd_dev); | |
2105 | rbd_spec_put(rbd_dev->parent_spec); | |
2106 | rbd_dev->parent_spec = NULL; | |
2107 | rbd_dev->parent_overlap = 0; | |
2108 | } | |
2109 | ||
a2acd00e AE |
2110 | /* |
2111 | * Parent image reference counting is used to determine when an | |
2112 | * image's parent fields can be safely torn down--after there are no | |
2113 | * more in-flight requests to the parent image. When the last | |
2114 | * reference is dropped, cleaning them up is safe. | |
2115 | */ | |
2116 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2117 | { | |
2118 | int counter; | |
2119 | ||
2120 | if (!rbd_dev->parent_spec) | |
2121 | return; | |
2122 | ||
2123 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2124 | if (counter > 0) | |
2125 | return; | |
2126 | ||
2127 | /* Last reference; clean up parent data structures */ | |
2128 | ||
2129 | if (!counter) | |
2130 | rbd_dev_unparent(rbd_dev); | |
2131 | else | |
9584d508 | 2132 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
2133 | } |
2134 | ||
2135 | /* | |
2136 | * If an image has a non-zero parent overlap, get a reference to its | |
2137 | * parent. | |
2138 | * | |
2139 | * Returns true if the rbd device has a parent with a non-zero | |
2140 | * overlap and a reference for it was successfully taken, or | |
2141 | * false otherwise. | |
2142 | */ | |
2143 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2144 | { | |
ae43e9d0 | 2145 | int counter = 0; |
a2acd00e AE |
2146 | |
2147 | if (!rbd_dev->parent_spec) | |
2148 | return false; | |
2149 | ||
ae43e9d0 ID |
2150 | down_read(&rbd_dev->header_rwsem); |
2151 | if (rbd_dev->parent_overlap) | |
2152 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2153 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
2154 | |
2155 | if (counter < 0) | |
9584d508 | 2156 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 2157 | |
ae43e9d0 | 2158 | return counter > 0; |
a2acd00e AE |
2159 | } |
2160 | ||
bf0d5f50 AE |
2161 | /* |
2162 | * Caller is responsible for filling in the list of object requests | |
2163 | * that comprises the image request, and the Linux request pointer | |
2164 | * (if there is one). | |
2165 | */ | |
cc344fa1 AE |
2166 | static struct rbd_img_request *rbd_img_request_create( |
2167 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2168 | u64 offset, u64 length, |
6d2940c8 | 2169 | enum obj_operation_type op_type, |
4e752f0a | 2170 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
2171 | { |
2172 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2173 | |
7a716aac | 2174 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
2175 | if (!img_request) |
2176 | return NULL; | |
2177 | ||
bf0d5f50 AE |
2178 | img_request->rq = NULL; |
2179 | img_request->rbd_dev = rbd_dev; | |
2180 | img_request->offset = offset; | |
2181 | img_request->length = length; | |
0c425248 | 2182 | img_request->flags = 0; |
90e98c52 GZ |
2183 | if (op_type == OBJ_OP_DISCARD) { |
2184 | img_request_discard_set(img_request); | |
2185 | img_request->snapc = snapc; | |
2186 | } else if (op_type == OBJ_OP_WRITE) { | |
0c425248 | 2187 | img_request_write_set(img_request); |
4e752f0a | 2188 | img_request->snapc = snapc; |
0c425248 | 2189 | } else { |
bf0d5f50 | 2190 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2191 | } |
a2acd00e | 2192 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2193 | img_request_layered_set(img_request); |
bf0d5f50 AE |
2194 | spin_lock_init(&img_request->completion_lock); |
2195 | img_request->next_completion = 0; | |
2196 | img_request->callback = NULL; | |
a5a337d4 | 2197 | img_request->result = 0; |
bf0d5f50 AE |
2198 | img_request->obj_request_count = 0; |
2199 | INIT_LIST_HEAD(&img_request->obj_requests); | |
2200 | kref_init(&img_request->kref); | |
2201 | ||
37206ee5 | 2202 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
6d2940c8 | 2203 | obj_op_name(op_type), offset, length, img_request); |
37206ee5 | 2204 | |
bf0d5f50 AE |
2205 | return img_request; |
2206 | } | |
2207 | ||
2208 | static void rbd_img_request_destroy(struct kref *kref) | |
2209 | { | |
2210 | struct rbd_img_request *img_request; | |
2211 | struct rbd_obj_request *obj_request; | |
2212 | struct rbd_obj_request *next_obj_request; | |
2213 | ||
2214 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2215 | ||
37206ee5 AE |
2216 | dout("%s: img %p\n", __func__, img_request); |
2217 | ||
bf0d5f50 AE |
2218 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2219 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2220 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2221 | |
a2acd00e AE |
2222 | if (img_request_layered_test(img_request)) { |
2223 | img_request_layered_clear(img_request); | |
2224 | rbd_dev_parent_put(img_request->rbd_dev); | |
2225 | } | |
2226 | ||
bef95455 JD |
2227 | if (img_request_write_test(img_request) || |
2228 | img_request_discard_test(img_request)) | |
812164f8 | 2229 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2230 | |
1c2a9dfe | 2231 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2232 | } |
2233 | ||
e93f3152 AE |
2234 | static struct rbd_img_request *rbd_parent_request_create( |
2235 | struct rbd_obj_request *obj_request, | |
2236 | u64 img_offset, u64 length) | |
2237 | { | |
2238 | struct rbd_img_request *parent_request; | |
2239 | struct rbd_device *rbd_dev; | |
2240 | ||
2241 | rbd_assert(obj_request->img_request); | |
2242 | rbd_dev = obj_request->img_request->rbd_dev; | |
2243 | ||
4e752f0a | 2244 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
6d2940c8 | 2245 | length, OBJ_OP_READ, NULL); |
e93f3152 AE |
2246 | if (!parent_request) |
2247 | return NULL; | |
2248 | ||
2249 | img_request_child_set(parent_request); | |
2250 | rbd_obj_request_get(obj_request); | |
2251 | parent_request->obj_request = obj_request; | |
2252 | ||
2253 | return parent_request; | |
2254 | } | |
2255 | ||
2256 | static void rbd_parent_request_destroy(struct kref *kref) | |
2257 | { | |
2258 | struct rbd_img_request *parent_request; | |
2259 | struct rbd_obj_request *orig_request; | |
2260 | ||
2261 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2262 | orig_request = parent_request->obj_request; | |
2263 | ||
2264 | parent_request->obj_request = NULL; | |
2265 | rbd_obj_request_put(orig_request); | |
2266 | img_request_child_clear(parent_request); | |
2267 | ||
2268 | rbd_img_request_destroy(kref); | |
2269 | } | |
2270 | ||
1217857f AE |
2271 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2272 | { | |
6365d33a | 2273 | struct rbd_img_request *img_request; |
1217857f AE |
2274 | unsigned int xferred; |
2275 | int result; | |
8b3e1a56 | 2276 | bool more; |
1217857f | 2277 | |
6365d33a AE |
2278 | rbd_assert(obj_request_img_data_test(obj_request)); |
2279 | img_request = obj_request->img_request; | |
2280 | ||
1217857f AE |
2281 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2282 | xferred = (unsigned int)obj_request->xferred; | |
2283 | result = obj_request->result; | |
2284 | if (result) { | |
2285 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
6d2940c8 GZ |
2286 | enum obj_operation_type op_type; |
2287 | ||
90e98c52 GZ |
2288 | if (img_request_discard_test(img_request)) |
2289 | op_type = OBJ_OP_DISCARD; | |
2290 | else if (img_request_write_test(img_request)) | |
2291 | op_type = OBJ_OP_WRITE; | |
2292 | else | |
2293 | op_type = OBJ_OP_READ; | |
1217857f | 2294 | |
9584d508 | 2295 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
6d2940c8 GZ |
2296 | obj_op_name(op_type), obj_request->length, |
2297 | obj_request->img_offset, obj_request->offset); | |
9584d508 | 2298 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
2299 | result, xferred); |
2300 | if (!img_request->result) | |
2301 | img_request->result = result; | |
082a75da ID |
2302 | /* |
2303 | * Need to end I/O on the entire obj_request worth of | |
2304 | * bytes in case of error. | |
2305 | */ | |
2306 | xferred = obj_request->length; | |
1217857f AE |
2307 | } |
2308 | ||
f1a4739f AE |
2309 | /* Image object requests don't own their page array */ |
2310 | ||
2311 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
2312 | obj_request->pages = NULL; | |
2313 | obj_request->page_count = 0; | |
2314 | } | |
2315 | ||
8b3e1a56 AE |
2316 | if (img_request_child_test(img_request)) { |
2317 | rbd_assert(img_request->obj_request != NULL); | |
2318 | more = obj_request->which < img_request->obj_request_count - 1; | |
2319 | } else { | |
2320 | rbd_assert(img_request->rq != NULL); | |
7ad18afa CH |
2321 | |
2322 | more = blk_update_request(img_request->rq, result, xferred); | |
2323 | if (!more) | |
2324 | __blk_mq_end_request(img_request->rq, result); | |
8b3e1a56 AE |
2325 | } |
2326 | ||
2327 | return more; | |
1217857f AE |
2328 | } |
2329 | ||
2169238d AE |
2330 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2331 | { | |
2332 | struct rbd_img_request *img_request; | |
2333 | u32 which = obj_request->which; | |
2334 | bool more = true; | |
2335 | ||
6365d33a | 2336 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2337 | img_request = obj_request->img_request; |
2338 | ||
2339 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2340 | rbd_assert(img_request != NULL); | |
2169238d AE |
2341 | rbd_assert(img_request->obj_request_count > 0); |
2342 | rbd_assert(which != BAD_WHICH); | |
2343 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2344 | |
2345 | spin_lock_irq(&img_request->completion_lock); | |
2346 | if (which != img_request->next_completion) | |
2347 | goto out; | |
2348 | ||
2349 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2350 | rbd_assert(more); |
2351 | rbd_assert(which < img_request->obj_request_count); | |
2352 | ||
2353 | if (!obj_request_done_test(obj_request)) | |
2354 | break; | |
1217857f | 2355 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2356 | which++; |
2357 | } | |
2358 | ||
2359 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2360 | img_request->next_completion = which; | |
2361 | out: | |
2362 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2363 | rbd_img_request_put(img_request); |
2169238d AE |
2364 | |
2365 | if (!more) | |
2366 | rbd_img_request_complete(img_request); | |
2367 | } | |
2368 | ||
3b434a2a JD |
2369 | /* |
2370 | * Add individual osd ops to the given ceph_osd_request and prepare | |
2371 | * them for submission. num_ops is the current number of | |
2372 | * osd operations already to the object request. | |
2373 | */ | |
2374 | static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, | |
2375 | struct ceph_osd_request *osd_request, | |
2376 | enum obj_operation_type op_type, | |
2377 | unsigned int num_ops) | |
2378 | { | |
2379 | struct rbd_img_request *img_request = obj_request->img_request; | |
2380 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2381 | u64 object_size = rbd_obj_bytes(&rbd_dev->header); | |
2382 | u64 offset = obj_request->offset; | |
2383 | u64 length = obj_request->length; | |
2384 | u64 img_end; | |
2385 | u16 opcode; | |
2386 | ||
2387 | if (op_type == OBJ_OP_DISCARD) { | |
d3246fb0 JD |
2388 | if (!offset && length == object_size && |
2389 | (!img_request_layered_test(img_request) || | |
2390 | !obj_request_overlaps_parent(obj_request))) { | |
3b434a2a JD |
2391 | opcode = CEPH_OSD_OP_DELETE; |
2392 | } else if ((offset + length == object_size)) { | |
2393 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2394 | } else { | |
2395 | down_read(&rbd_dev->header_rwsem); | |
2396 | img_end = rbd_dev->header.image_size; | |
2397 | up_read(&rbd_dev->header_rwsem); | |
2398 | ||
2399 | if (obj_request->img_offset + length == img_end) | |
2400 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2401 | else | |
2402 | opcode = CEPH_OSD_OP_ZERO; | |
2403 | } | |
2404 | } else if (op_type == OBJ_OP_WRITE) { | |
e30b7577 ID |
2405 | if (!offset && length == object_size) |
2406 | opcode = CEPH_OSD_OP_WRITEFULL; | |
2407 | else | |
2408 | opcode = CEPH_OSD_OP_WRITE; | |
3b434a2a JD |
2409 | osd_req_op_alloc_hint_init(osd_request, num_ops, |
2410 | object_size, object_size); | |
2411 | num_ops++; | |
2412 | } else { | |
2413 | opcode = CEPH_OSD_OP_READ; | |
2414 | } | |
2415 | ||
7e868b6e | 2416 | if (opcode == CEPH_OSD_OP_DELETE) |
144cba14 | 2417 | osd_req_op_init(osd_request, num_ops, opcode, 0); |
7e868b6e ID |
2418 | else |
2419 | osd_req_op_extent_init(osd_request, num_ops, opcode, | |
2420 | offset, length, 0, 0); | |
2421 | ||
3b434a2a JD |
2422 | if (obj_request->type == OBJ_REQUEST_BIO) |
2423 | osd_req_op_extent_osd_data_bio(osd_request, num_ops, | |
2424 | obj_request->bio_list, length); | |
2425 | else if (obj_request->type == OBJ_REQUEST_PAGES) | |
2426 | osd_req_op_extent_osd_data_pages(osd_request, num_ops, | |
2427 | obj_request->pages, length, | |
2428 | offset & ~PAGE_MASK, false, false); | |
2429 | ||
2430 | /* Discards are also writes */ | |
2431 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) | |
2432 | rbd_osd_req_format_write(obj_request); | |
2433 | else | |
2434 | rbd_osd_req_format_read(obj_request); | |
2435 | } | |
2436 | ||
f1a4739f AE |
2437 | /* |
2438 | * Split up an image request into one or more object requests, each | |
2439 | * to a different object. The "type" parameter indicates whether | |
2440 | * "data_desc" is the pointer to the head of a list of bio | |
2441 | * structures, or the base of a page array. In either case this | |
2442 | * function assumes data_desc describes memory sufficient to hold | |
2443 | * all data described by the image request. | |
2444 | */ | |
2445 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2446 | enum obj_request_type type, | |
2447 | void *data_desc) | |
bf0d5f50 AE |
2448 | { |
2449 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2450 | struct rbd_obj_request *obj_request = NULL; | |
2451 | struct rbd_obj_request *next_obj_request; | |
a158073c | 2452 | struct bio *bio_list = NULL; |
f1a4739f | 2453 | unsigned int bio_offset = 0; |
a158073c | 2454 | struct page **pages = NULL; |
6d2940c8 | 2455 | enum obj_operation_type op_type; |
7da22d29 | 2456 | u64 img_offset; |
bf0d5f50 | 2457 | u64 resid; |
bf0d5f50 | 2458 | |
f1a4739f AE |
2459 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2460 | (int)type, data_desc); | |
37206ee5 | 2461 | |
7da22d29 | 2462 | img_offset = img_request->offset; |
bf0d5f50 | 2463 | resid = img_request->length; |
4dda41d3 | 2464 | rbd_assert(resid > 0); |
3b434a2a | 2465 | op_type = rbd_img_request_op_type(img_request); |
f1a4739f AE |
2466 | |
2467 | if (type == OBJ_REQUEST_BIO) { | |
2468 | bio_list = data_desc; | |
4f024f37 KO |
2469 | rbd_assert(img_offset == |
2470 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
90e98c52 | 2471 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2472 | pages = data_desc; |
2473 | } | |
2474 | ||
bf0d5f50 | 2475 | while (resid) { |
2fa12320 | 2476 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2477 | const char *object_name; |
bf0d5f50 AE |
2478 | u64 offset; |
2479 | u64 length; | |
2480 | ||
7da22d29 | 2481 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2482 | if (!object_name) |
2483 | goto out_unwind; | |
7da22d29 AE |
2484 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2485 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2486 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2487 | offset, length, type); |
78c2a44a AE |
2488 | /* object request has its own copy of the object name */ |
2489 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2490 | if (!obj_request) |
2491 | goto out_unwind; | |
62054da6 | 2492 | |
03507db6 JD |
2493 | /* |
2494 | * set obj_request->img_request before creating the | |
2495 | * osd_request so that it gets the right snapc | |
2496 | */ | |
2497 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2498 | |
f1a4739f AE |
2499 | if (type == OBJ_REQUEST_BIO) { |
2500 | unsigned int clone_size; | |
2501 | ||
2502 | rbd_assert(length <= (u64)UINT_MAX); | |
2503 | clone_size = (unsigned int)length; | |
2504 | obj_request->bio_list = | |
2505 | bio_chain_clone_range(&bio_list, | |
2506 | &bio_offset, | |
2507 | clone_size, | |
2224d879 | 2508 | GFP_NOIO); |
f1a4739f | 2509 | if (!obj_request->bio_list) |
62054da6 | 2510 | goto out_unwind; |
90e98c52 | 2511 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2512 | unsigned int page_count; |
2513 | ||
2514 | obj_request->pages = pages; | |
2515 | page_count = (u32)calc_pages_for(offset, length); | |
2516 | obj_request->page_count = page_count; | |
2517 | if ((offset + length) & ~PAGE_MASK) | |
2518 | page_count--; /* more on last page */ | |
2519 | pages += page_count; | |
2520 | } | |
bf0d5f50 | 2521 | |
6d2940c8 GZ |
2522 | osd_req = rbd_osd_req_create(rbd_dev, op_type, |
2523 | (op_type == OBJ_OP_WRITE) ? 2 : 1, | |
2524 | obj_request); | |
2fa12320 | 2525 | if (!osd_req) |
62054da6 | 2526 | goto out_unwind; |
3b434a2a | 2527 | |
2fa12320 | 2528 | obj_request->osd_req = osd_req; |
2169238d | 2529 | obj_request->callback = rbd_img_obj_callback; |
3b434a2a | 2530 | obj_request->img_offset = img_offset; |
9d4df01f | 2531 | |
3b434a2a | 2532 | rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
430c28c3 | 2533 | |
3b434a2a | 2534 | rbd_img_request_get(img_request); |
bf0d5f50 | 2535 | |
7da22d29 | 2536 | img_offset += length; |
bf0d5f50 AE |
2537 | resid -= length; |
2538 | } | |
2539 | ||
2540 | return 0; | |
2541 | ||
bf0d5f50 AE |
2542 | out_unwind: |
2543 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2544 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2545 | |
2546 | return -ENOMEM; | |
2547 | } | |
2548 | ||
0eefd470 | 2549 | static void |
2761713d | 2550 | rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) |
0eefd470 AE |
2551 | { |
2552 | struct rbd_img_request *img_request; | |
2553 | struct rbd_device *rbd_dev; | |
ebda6408 | 2554 | struct page **pages; |
0eefd470 AE |
2555 | u32 page_count; |
2556 | ||
2761713d ID |
2557 | dout("%s: obj %p\n", __func__, obj_request); |
2558 | ||
d3246fb0 JD |
2559 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
2560 | obj_request->type == OBJ_REQUEST_NODATA); | |
0eefd470 AE |
2561 | rbd_assert(obj_request_img_data_test(obj_request)); |
2562 | img_request = obj_request->img_request; | |
2563 | rbd_assert(img_request); | |
2564 | ||
2565 | rbd_dev = img_request->rbd_dev; | |
2566 | rbd_assert(rbd_dev); | |
0eefd470 | 2567 | |
ebda6408 AE |
2568 | pages = obj_request->copyup_pages; |
2569 | rbd_assert(pages != NULL); | |
0eefd470 | 2570 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2571 | page_count = obj_request->copyup_page_count; |
2572 | rbd_assert(page_count); | |
2573 | obj_request->copyup_page_count = 0; | |
2574 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2575 | |
2576 | /* | |
2577 | * We want the transfer count to reflect the size of the | |
2578 | * original write request. There is no such thing as a | |
2579 | * successful short write, so if the request was successful | |
2580 | * we can just set it to the originally-requested length. | |
2581 | */ | |
2582 | if (!obj_request->result) | |
2583 | obj_request->xferred = obj_request->length; | |
2584 | ||
2761713d | 2585 | obj_request_done_set(obj_request); |
0eefd470 AE |
2586 | } |
2587 | ||
3d7efd18 AE |
2588 | static void |
2589 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2590 | { | |
2591 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2592 | struct ceph_osd_request *osd_req; |
2593 | struct ceph_osd_client *osdc; | |
2594 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2595 | struct page **pages; |
d3246fb0 | 2596 | enum obj_operation_type op_type; |
ebda6408 | 2597 | u32 page_count; |
bbea1c1a | 2598 | int img_result; |
ebda6408 | 2599 | u64 parent_length; |
3d7efd18 AE |
2600 | |
2601 | rbd_assert(img_request_child_test(img_request)); | |
2602 | ||
2603 | /* First get what we need from the image request */ | |
2604 | ||
2605 | pages = img_request->copyup_pages; | |
2606 | rbd_assert(pages != NULL); | |
2607 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2608 | page_count = img_request->copyup_page_count; |
2609 | rbd_assert(page_count); | |
2610 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2611 | |
2612 | orig_request = img_request->obj_request; | |
2613 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2614 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2615 | img_result = img_request->result; |
ebda6408 AE |
2616 | parent_length = img_request->length; |
2617 | rbd_assert(parent_length == img_request->xferred); | |
91c6febb | 2618 | rbd_img_request_put(img_request); |
3d7efd18 | 2619 | |
91c6febb AE |
2620 | rbd_assert(orig_request->img_request); |
2621 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2622 | rbd_assert(rbd_dev); |
0eefd470 | 2623 | |
bbea1c1a AE |
2624 | /* |
2625 | * If the overlap has become 0 (most likely because the | |
2626 | * image has been flattened) we need to free the pages | |
2627 | * and re-submit the original write request. | |
2628 | */ | |
2629 | if (!rbd_dev->parent_overlap) { | |
2630 | struct ceph_osd_client *osdc; | |
3d7efd18 | 2631 | |
bbea1c1a AE |
2632 | ceph_release_page_vector(pages, page_count); |
2633 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2634 | img_result = rbd_obj_request_submit(osdc, orig_request); | |
2635 | if (!img_result) | |
2636 | return; | |
2637 | } | |
0eefd470 | 2638 | |
bbea1c1a | 2639 | if (img_result) |
0eefd470 | 2640 | goto out_err; |
0eefd470 | 2641 | |
8785b1d4 AE |
2642 | /* |
2643 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2644 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2645 | * request. Allocate the new copyup osd request for the |
2646 | * original request, and release the old one. | |
2647 | */ | |
bbea1c1a | 2648 | img_result = -ENOMEM; |
0eefd470 AE |
2649 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2650 | if (!osd_req) | |
2651 | goto out_err; | |
8785b1d4 | 2652 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2653 | orig_request->osd_req = osd_req; |
2654 | orig_request->copyup_pages = pages; | |
ebda6408 | 2655 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2656 | |
0eefd470 | 2657 | /* Initialize the copyup op */ |
3d7efd18 | 2658 | |
0eefd470 | 2659 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2660 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2661 | false, false); |
3d7efd18 | 2662 | |
d3246fb0 | 2663 | /* Add the other op(s) */ |
0eefd470 | 2664 | |
d3246fb0 JD |
2665 | op_type = rbd_img_request_op_type(orig_request->img_request); |
2666 | rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); | |
0eefd470 AE |
2667 | |
2668 | /* All set, send it off. */ | |
2669 | ||
0eefd470 | 2670 | osdc = &rbd_dev->rbd_client->client->osdc; |
bbea1c1a AE |
2671 | img_result = rbd_obj_request_submit(osdc, orig_request); |
2672 | if (!img_result) | |
0eefd470 AE |
2673 | return; |
2674 | out_err: | |
2675 | /* Record the error code and complete the request */ | |
2676 | ||
bbea1c1a | 2677 | orig_request->result = img_result; |
0eefd470 AE |
2678 | orig_request->xferred = 0; |
2679 | obj_request_done_set(orig_request); | |
2680 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2681 | } |
2682 | ||
2683 | /* | |
2684 | * Read from the parent image the range of data that covers the | |
2685 | * entire target of the given object request. This is used for | |
2686 | * satisfying a layered image write request when the target of an | |
2687 | * object request from the image request does not exist. | |
2688 | * | |
2689 | * A page array big enough to hold the returned data is allocated | |
2690 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2691 | * When the read completes, this page array will be transferred to | |
2692 | * the original object request for the copyup operation. | |
2693 | * | |
2694 | * If an error occurs, record it as the result of the original | |
2695 | * object request and mark it done so it gets completed. | |
2696 | */ | |
2697 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2698 | { | |
2699 | struct rbd_img_request *img_request = NULL; | |
2700 | struct rbd_img_request *parent_request = NULL; | |
2701 | struct rbd_device *rbd_dev; | |
2702 | u64 img_offset; | |
2703 | u64 length; | |
2704 | struct page **pages = NULL; | |
2705 | u32 page_count; | |
2706 | int result; | |
2707 | ||
2708 | rbd_assert(obj_request_img_data_test(obj_request)); | |
b91f09f1 | 2709 | rbd_assert(obj_request_type_valid(obj_request->type)); |
3d7efd18 AE |
2710 | |
2711 | img_request = obj_request->img_request; | |
2712 | rbd_assert(img_request != NULL); | |
2713 | rbd_dev = img_request->rbd_dev; | |
2714 | rbd_assert(rbd_dev->parent != NULL); | |
2715 | ||
2716 | /* | |
2717 | * Determine the byte range covered by the object in the | |
2718 | * child image to which the original request was to be sent. | |
2719 | */ | |
2720 | img_offset = obj_request->img_offset - obj_request->offset; | |
2721 | length = (u64)1 << rbd_dev->header.obj_order; | |
2722 | ||
a9e8ba2c AE |
2723 | /* |
2724 | * There is no defined parent data beyond the parent | |
2725 | * overlap, so limit what we read at that boundary if | |
2726 | * necessary. | |
2727 | */ | |
2728 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2729 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2730 | length = rbd_dev->parent_overlap - img_offset; | |
2731 | } | |
2732 | ||
3d7efd18 AE |
2733 | /* |
2734 | * Allocate a page array big enough to receive the data read | |
2735 | * from the parent. | |
2736 | */ | |
2737 | page_count = (u32)calc_pages_for(0, length); | |
2738 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2739 | if (IS_ERR(pages)) { | |
2740 | result = PTR_ERR(pages); | |
2741 | pages = NULL; | |
2742 | goto out_err; | |
2743 | } | |
2744 | ||
2745 | result = -ENOMEM; | |
e93f3152 AE |
2746 | parent_request = rbd_parent_request_create(obj_request, |
2747 | img_offset, length); | |
3d7efd18 AE |
2748 | if (!parent_request) |
2749 | goto out_err; | |
3d7efd18 AE |
2750 | |
2751 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2752 | if (result) | |
2753 | goto out_err; | |
2754 | parent_request->copyup_pages = pages; | |
ebda6408 | 2755 | parent_request->copyup_page_count = page_count; |
3d7efd18 AE |
2756 | |
2757 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2758 | result = rbd_img_request_submit(parent_request); | |
2759 | if (!result) | |
2760 | return 0; | |
2761 | ||
2762 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2763 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2764 | parent_request->obj_request = NULL; |
2765 | rbd_obj_request_put(obj_request); | |
2766 | out_err: | |
2767 | if (pages) | |
2768 | ceph_release_page_vector(pages, page_count); | |
2769 | if (parent_request) | |
2770 | rbd_img_request_put(parent_request); | |
2771 | obj_request->result = result; | |
2772 | obj_request->xferred = 0; | |
2773 | obj_request_done_set(obj_request); | |
2774 | ||
2775 | return result; | |
2776 | } | |
2777 | ||
c5b5ef6c AE |
2778 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2779 | { | |
c5b5ef6c | 2780 | struct rbd_obj_request *orig_request; |
638f5abe | 2781 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2782 | int result; |
2783 | ||
2784 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2785 | ||
2786 | /* | |
2787 | * All we need from the object request is the original | |
2788 | * request and the result of the STAT op. Grab those, then | |
2789 | * we're done with the request. | |
2790 | */ | |
2791 | orig_request = obj_request->obj_request; | |
2792 | obj_request->obj_request = NULL; | |
912c317d | 2793 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2794 | rbd_assert(orig_request); |
2795 | rbd_assert(orig_request->img_request); | |
2796 | ||
2797 | result = obj_request->result; | |
2798 | obj_request->result = 0; | |
2799 | ||
2800 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2801 | obj_request, orig_request, result, | |
2802 | obj_request->xferred, obj_request->length); | |
2803 | rbd_obj_request_put(obj_request); | |
2804 | ||
638f5abe AE |
2805 | /* |
2806 | * If the overlap has become 0 (most likely because the | |
2807 | * image has been flattened) we need to free the pages | |
2808 | * and re-submit the original write request. | |
2809 | */ | |
2810 | rbd_dev = orig_request->img_request->rbd_dev; | |
2811 | if (!rbd_dev->parent_overlap) { | |
2812 | struct ceph_osd_client *osdc; | |
2813 | ||
638f5abe AE |
2814 | osdc = &rbd_dev->rbd_client->client->osdc; |
2815 | result = rbd_obj_request_submit(osdc, orig_request); | |
2816 | if (!result) | |
2817 | return; | |
2818 | } | |
c5b5ef6c AE |
2819 | |
2820 | /* | |
2821 | * Our only purpose here is to determine whether the object | |
2822 | * exists, and we don't want to treat the non-existence as | |
2823 | * an error. If something else comes back, transfer the | |
2824 | * error to the original request and complete it now. | |
2825 | */ | |
2826 | if (!result) { | |
2827 | obj_request_existence_set(orig_request, true); | |
2828 | } else if (result == -ENOENT) { | |
2829 | obj_request_existence_set(orig_request, false); | |
2830 | } else if (result) { | |
2831 | orig_request->result = result; | |
3d7efd18 | 2832 | goto out; |
c5b5ef6c AE |
2833 | } |
2834 | ||
2835 | /* | |
2836 | * Resubmit the original request now that we have recorded | |
2837 | * whether the target object exists. | |
2838 | */ | |
b454e36d | 2839 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2840 | out: |
c5b5ef6c AE |
2841 | if (orig_request->result) |
2842 | rbd_obj_request_complete(orig_request); | |
c5b5ef6c AE |
2843 | } |
2844 | ||
2845 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2846 | { | |
2847 | struct rbd_obj_request *stat_request; | |
2848 | struct rbd_device *rbd_dev; | |
2849 | struct ceph_osd_client *osdc; | |
2850 | struct page **pages = NULL; | |
2851 | u32 page_count; | |
2852 | size_t size; | |
2853 | int ret; | |
2854 | ||
2855 | /* | |
2856 | * The response data for a STAT call consists of: | |
2857 | * le64 length; | |
2858 | * struct { | |
2859 | * le32 tv_sec; | |
2860 | * le32 tv_nsec; | |
2861 | * } mtime; | |
2862 | */ | |
2863 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2864 | page_count = (u32)calc_pages_for(0, size); | |
2865 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2866 | if (IS_ERR(pages)) | |
2867 | return PTR_ERR(pages); | |
2868 | ||
2869 | ret = -ENOMEM; | |
2870 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2871 | OBJ_REQUEST_PAGES); | |
2872 | if (!stat_request) | |
2873 | goto out; | |
2874 | ||
2875 | rbd_obj_request_get(obj_request); | |
2876 | stat_request->obj_request = obj_request; | |
2877 | stat_request->pages = pages; | |
2878 | stat_request->page_count = page_count; | |
2879 | ||
2880 | rbd_assert(obj_request->img_request); | |
2881 | rbd_dev = obj_request->img_request->rbd_dev; | |
6d2940c8 | 2882 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 2883 | stat_request); |
c5b5ef6c AE |
2884 | if (!stat_request->osd_req) |
2885 | goto out; | |
2886 | stat_request->callback = rbd_img_obj_exists_callback; | |
2887 | ||
144cba14 | 2888 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); |
c5b5ef6c AE |
2889 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, |
2890 | false, false); | |
9d4df01f | 2891 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2892 | |
2893 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2894 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2895 | out: | |
2896 | if (ret) | |
2897 | rbd_obj_request_put(obj_request); | |
2898 | ||
2899 | return ret; | |
2900 | } | |
2901 | ||
70d045f6 | 2902 | static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
b454e36d AE |
2903 | { |
2904 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2905 | struct rbd_device *rbd_dev; |
b454e36d AE |
2906 | |
2907 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2908 | ||
2909 | img_request = obj_request->img_request; | |
2910 | rbd_assert(img_request); | |
a9e8ba2c | 2911 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2912 | |
70d045f6 | 2913 | /* Reads */ |
1c220881 JD |
2914 | if (!img_request_write_test(img_request) && |
2915 | !img_request_discard_test(img_request)) | |
70d045f6 ID |
2916 | return true; |
2917 | ||
2918 | /* Non-layered writes */ | |
2919 | if (!img_request_layered_test(img_request)) | |
2920 | return true; | |
2921 | ||
b454e36d | 2922 | /* |
70d045f6 ID |
2923 | * Layered writes outside of the parent overlap range don't |
2924 | * share any data with the parent. | |
b454e36d | 2925 | */ |
70d045f6 ID |
2926 | if (!obj_request_overlaps_parent(obj_request)) |
2927 | return true; | |
b454e36d | 2928 | |
c622d226 GZ |
2929 | /* |
2930 | * Entire-object layered writes - we will overwrite whatever | |
2931 | * parent data there is anyway. | |
2932 | */ | |
2933 | if (!obj_request->offset && | |
2934 | obj_request->length == rbd_obj_bytes(&rbd_dev->header)) | |
2935 | return true; | |
2936 | ||
70d045f6 ID |
2937 | /* |
2938 | * If the object is known to already exist, its parent data has | |
2939 | * already been copied. | |
2940 | */ | |
2941 | if (obj_request_known_test(obj_request) && | |
2942 | obj_request_exists_test(obj_request)) | |
2943 | return true; | |
2944 | ||
2945 | return false; | |
2946 | } | |
2947 | ||
2948 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) | |
2949 | { | |
2950 | if (img_obj_request_simple(obj_request)) { | |
b454e36d AE |
2951 | struct rbd_device *rbd_dev; |
2952 | struct ceph_osd_client *osdc; | |
2953 | ||
2954 | rbd_dev = obj_request->img_request->rbd_dev; | |
2955 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2956 | ||
2957 | return rbd_obj_request_submit(osdc, obj_request); | |
2958 | } | |
2959 | ||
2960 | /* | |
3d7efd18 AE |
2961 | * It's a layered write. The target object might exist but |
2962 | * we may not know that yet. If we know it doesn't exist, | |
2963 | * start by reading the data for the full target object from | |
2964 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2965 | */ |
70d045f6 | 2966 | if (obj_request_known_test(obj_request)) |
3d7efd18 AE |
2967 | return rbd_img_obj_parent_read_full(obj_request); |
2968 | ||
2969 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2970 | |
2971 | return rbd_img_obj_exists_submit(obj_request); | |
2972 | } | |
2973 | ||
bf0d5f50 AE |
2974 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2975 | { | |
bf0d5f50 | 2976 | struct rbd_obj_request *obj_request; |
46faeed4 | 2977 | struct rbd_obj_request *next_obj_request; |
663ae2cc | 2978 | int ret = 0; |
bf0d5f50 | 2979 | |
37206ee5 | 2980 | dout("%s: img %p\n", __func__, img_request); |
bf0d5f50 | 2981 | |
663ae2cc ID |
2982 | rbd_img_request_get(img_request); |
2983 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { | |
b454e36d | 2984 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 | 2985 | if (ret) |
663ae2cc | 2986 | goto out_put_ireq; |
bf0d5f50 AE |
2987 | } |
2988 | ||
663ae2cc ID |
2989 | out_put_ireq: |
2990 | rbd_img_request_put(img_request); | |
2991 | return ret; | |
bf0d5f50 | 2992 | } |
8b3e1a56 AE |
2993 | |
2994 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2995 | { | |
2996 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2997 | struct rbd_device *rbd_dev; |
2998 | u64 obj_end; | |
02c74fba AE |
2999 | u64 img_xferred; |
3000 | int img_result; | |
8b3e1a56 AE |
3001 | |
3002 | rbd_assert(img_request_child_test(img_request)); | |
3003 | ||
02c74fba AE |
3004 | /* First get what we need from the image request and release it */ |
3005 | ||
8b3e1a56 | 3006 | obj_request = img_request->obj_request; |
02c74fba AE |
3007 | img_xferred = img_request->xferred; |
3008 | img_result = img_request->result; | |
3009 | rbd_img_request_put(img_request); | |
3010 | ||
3011 | /* | |
3012 | * If the overlap has become 0 (most likely because the | |
3013 | * image has been flattened) we need to re-submit the | |
3014 | * original request. | |
3015 | */ | |
a9e8ba2c AE |
3016 | rbd_assert(obj_request); |
3017 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
3018 | rbd_dev = obj_request->img_request->rbd_dev; |
3019 | if (!rbd_dev->parent_overlap) { | |
3020 | struct ceph_osd_client *osdc; | |
3021 | ||
3022 | osdc = &rbd_dev->rbd_client->client->osdc; | |
3023 | img_result = rbd_obj_request_submit(osdc, obj_request); | |
3024 | if (!img_result) | |
3025 | return; | |
3026 | } | |
a9e8ba2c | 3027 | |
02c74fba | 3028 | obj_request->result = img_result; |
a9e8ba2c AE |
3029 | if (obj_request->result) |
3030 | goto out; | |
3031 | ||
3032 | /* | |
3033 | * We need to zero anything beyond the parent overlap | |
3034 | * boundary. Since rbd_img_obj_request_read_callback() | |
3035 | * will zero anything beyond the end of a short read, an | |
3036 | * easy way to do this is to pretend the data from the | |
3037 | * parent came up short--ending at the overlap boundary. | |
3038 | */ | |
3039 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
3040 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
3041 | if (obj_end > rbd_dev->parent_overlap) { |
3042 | u64 xferred = 0; | |
3043 | ||
3044 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
3045 | xferred = rbd_dev->parent_overlap - | |
3046 | obj_request->img_offset; | |
8b3e1a56 | 3047 | |
02c74fba | 3048 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 3049 | } else { |
02c74fba | 3050 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
3051 | } |
3052 | out: | |
8b3e1a56 AE |
3053 | rbd_img_obj_request_read_callback(obj_request); |
3054 | rbd_obj_request_complete(obj_request); | |
3055 | } | |
3056 | ||
3057 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
3058 | { | |
8b3e1a56 AE |
3059 | struct rbd_img_request *img_request; |
3060 | int result; | |
3061 | ||
3062 | rbd_assert(obj_request_img_data_test(obj_request)); | |
3063 | rbd_assert(obj_request->img_request != NULL); | |
3064 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 3065 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 3066 | |
8b3e1a56 | 3067 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 3068 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 3069 | obj_request->img_offset, |
e93f3152 | 3070 | obj_request->length); |
8b3e1a56 AE |
3071 | result = -ENOMEM; |
3072 | if (!img_request) | |
3073 | goto out_err; | |
3074 | ||
5b2ab72d AE |
3075 | if (obj_request->type == OBJ_REQUEST_BIO) |
3076 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
3077 | obj_request->bio_list); | |
3078 | else | |
3079 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
3080 | obj_request->pages); | |
8b3e1a56 AE |
3081 | if (result) |
3082 | goto out_err; | |
3083 | ||
3084 | img_request->callback = rbd_img_parent_read_callback; | |
3085 | result = rbd_img_request_submit(img_request); | |
3086 | if (result) | |
3087 | goto out_err; | |
3088 | ||
3089 | return; | |
3090 | out_err: | |
3091 | if (img_request) | |
3092 | rbd_img_request_put(img_request); | |
3093 | obj_request->result = result; | |
3094 | obj_request->xferred = 0; | |
3095 | obj_request_done_set(obj_request); | |
3096 | } | |
bf0d5f50 | 3097 | |
922dab61 ID |
3098 | static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, |
3099 | u64 notifier_id, void *data, size_t data_len) | |
b8d70035 | 3100 | { |
922dab61 ID |
3101 | struct rbd_device *rbd_dev = arg; |
3102 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
e627db08 | 3103 | int ret; |
b8d70035 | 3104 | |
922dab61 ID |
3105 | dout("%s rbd_dev %p cookie %llu notify_id %llu\n", __func__, rbd_dev, |
3106 | cookie, notify_id); | |
52bb1f9b ID |
3107 | |
3108 | /* | |
3109 | * Until adequate refresh error handling is in place, there is | |
3110 | * not much we can do here, except warn. | |
3111 | * | |
3112 | * See http://tracker.ceph.com/issues/5040 | |
3113 | */ | |
e627db08 AE |
3114 | ret = rbd_dev_refresh(rbd_dev); |
3115 | if (ret) | |
9584d508 | 3116 | rbd_warn(rbd_dev, "refresh failed: %d", ret); |
b8d70035 | 3117 | |
922dab61 ID |
3118 | ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
3119 | &rbd_dev->header_oloc, notify_id, cookie, | |
3120 | NULL, 0); | |
52bb1f9b | 3121 | if (ret) |
9584d508 | 3122 | rbd_warn(rbd_dev, "notify_ack ret %d", ret); |
b8d70035 AE |
3123 | } |
3124 | ||
99d16943 ID |
3125 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
3126 | ||
922dab61 | 3127 | static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
bb040aa0 | 3128 | { |
922dab61 | 3129 | struct rbd_device *rbd_dev = arg; |
bb040aa0 | 3130 | |
922dab61 | 3131 | rbd_warn(rbd_dev, "encountered watch error: %d", err); |
bb040aa0 | 3132 | |
99d16943 ID |
3133 | mutex_lock(&rbd_dev->watch_mutex); |
3134 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { | |
3135 | __rbd_unregister_watch(rbd_dev); | |
3136 | rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; | |
bb040aa0 | 3137 | |
99d16943 | 3138 | queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
bb040aa0 | 3139 | } |
99d16943 | 3140 | mutex_unlock(&rbd_dev->watch_mutex); |
bb040aa0 ID |
3141 | } |
3142 | ||
9969ebc5 | 3143 | /* |
99d16943 | 3144 | * watch_mutex must be locked |
9969ebc5 | 3145 | */ |
99d16943 | 3146 | static int __rbd_register_watch(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3147 | { |
3148 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
922dab61 | 3149 | struct ceph_osd_linger_request *handle; |
9969ebc5 | 3150 | |
922dab61 | 3151 | rbd_assert(!rbd_dev->watch_handle); |
99d16943 | 3152 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
9969ebc5 | 3153 | |
922dab61 ID |
3154 | handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
3155 | &rbd_dev->header_oloc, rbd_watch_cb, | |
3156 | rbd_watch_errcb, rbd_dev); | |
3157 | if (IS_ERR(handle)) | |
3158 | return PTR_ERR(handle); | |
8eb87565 | 3159 | |
922dab61 | 3160 | rbd_dev->watch_handle = handle; |
b30a01f2 | 3161 | return 0; |
b30a01f2 ID |
3162 | } |
3163 | ||
99d16943 ID |
3164 | /* |
3165 | * watch_mutex must be locked | |
3166 | */ | |
3167 | static void __rbd_unregister_watch(struct rbd_device *rbd_dev) | |
b30a01f2 | 3168 | { |
922dab61 ID |
3169 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
3170 | int ret; | |
b30a01f2 | 3171 | |
99d16943 ID |
3172 | rbd_assert(rbd_dev->watch_handle); |
3173 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
b30a01f2 | 3174 | |
922dab61 ID |
3175 | ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
3176 | if (ret) | |
3177 | rbd_warn(rbd_dev, "failed to unwatch: %d", ret); | |
76756a51 | 3178 | |
922dab61 | 3179 | rbd_dev->watch_handle = NULL; |
c525f036 ID |
3180 | } |
3181 | ||
99d16943 ID |
3182 | static int rbd_register_watch(struct rbd_device *rbd_dev) |
3183 | { | |
3184 | int ret; | |
3185 | ||
3186 | mutex_lock(&rbd_dev->watch_mutex); | |
3187 | rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); | |
3188 | ret = __rbd_register_watch(rbd_dev); | |
3189 | if (ret) | |
3190 | goto out; | |
3191 | ||
3192 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3193 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3194 | ||
3195 | out: | |
3196 | mutex_unlock(&rbd_dev->watch_mutex); | |
3197 | return ret; | |
3198 | } | |
3199 | ||
3200 | static void cancel_tasks_sync(struct rbd_device *rbd_dev) | |
c525f036 | 3201 | { |
99d16943 ID |
3202 | dout("%s rbd_dev %p\n", __func__, rbd_dev); |
3203 | ||
3204 | cancel_delayed_work_sync(&rbd_dev->watch_dwork); | |
3205 | } | |
3206 | ||
3207 | static void rbd_unregister_watch(struct rbd_device *rbd_dev) | |
3208 | { | |
3209 | cancel_tasks_sync(rbd_dev); | |
3210 | ||
3211 | mutex_lock(&rbd_dev->watch_mutex); | |
3212 | if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) | |
3213 | __rbd_unregister_watch(rbd_dev); | |
3214 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
3215 | mutex_unlock(&rbd_dev->watch_mutex); | |
811c6688 | 3216 | |
811c6688 | 3217 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
fca27065 ID |
3218 | } |
3219 | ||
99d16943 ID |
3220 | static void rbd_reregister_watch(struct work_struct *work) |
3221 | { | |
3222 | struct rbd_device *rbd_dev = container_of(to_delayed_work(work), | |
3223 | struct rbd_device, watch_dwork); | |
3224 | int ret; | |
3225 | ||
3226 | dout("%s rbd_dev %p\n", __func__, rbd_dev); | |
3227 | ||
3228 | mutex_lock(&rbd_dev->watch_mutex); | |
3229 | if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) | |
3230 | goto fail_unlock; | |
3231 | ||
3232 | ret = __rbd_register_watch(rbd_dev); | |
3233 | if (ret) { | |
3234 | rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); | |
3235 | if (ret != -EBLACKLISTED) | |
3236 | queue_delayed_work(rbd_dev->task_wq, | |
3237 | &rbd_dev->watch_dwork, | |
3238 | RBD_RETRY_DELAY); | |
3239 | goto fail_unlock; | |
3240 | } | |
3241 | ||
3242 | rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; | |
3243 | rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; | |
3244 | mutex_unlock(&rbd_dev->watch_mutex); | |
3245 | ||
3246 | ret = rbd_dev_refresh(rbd_dev); | |
3247 | if (ret) | |
3248 | rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); | |
3249 | ||
3250 | return; | |
3251 | ||
3252 | fail_unlock: | |
3253 | mutex_unlock(&rbd_dev->watch_mutex); | |
3254 | } | |
3255 | ||
36be9a76 | 3256 | /* |
f40eb349 AE |
3257 | * Synchronous osd object method call. Returns the number of bytes |
3258 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3259 | */ |
3260 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
3261 | const char *object_name, | |
3262 | const char *class_name, | |
3263 | const char *method_name, | |
4157976b | 3264 | const void *outbound, |
36be9a76 | 3265 | size_t outbound_size, |
4157976b | 3266 | void *inbound, |
e2a58ee5 | 3267 | size_t inbound_size) |
36be9a76 | 3268 | { |
2169238d | 3269 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 3270 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
3271 | struct page **pages; |
3272 | u32 page_count; | |
3273 | int ret; | |
3274 | ||
3275 | /* | |
6010a451 AE |
3276 | * Method calls are ultimately read operations. The result |
3277 | * should placed into the inbound buffer provided. They | |
3278 | * also supply outbound data--parameters for the object | |
3279 | * method. Currently if this is present it will be a | |
3280 | * snapshot id. | |
36be9a76 | 3281 | */ |
57385b51 | 3282 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
3283 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
3284 | if (IS_ERR(pages)) | |
3285 | return PTR_ERR(pages); | |
3286 | ||
3287 | ret = -ENOMEM; | |
6010a451 | 3288 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
3289 | OBJ_REQUEST_PAGES); |
3290 | if (!obj_request) | |
3291 | goto out; | |
3292 | ||
3293 | obj_request->pages = pages; | |
3294 | obj_request->page_count = page_count; | |
3295 | ||
6d2940c8 | 3296 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 3297 | obj_request); |
36be9a76 AE |
3298 | if (!obj_request->osd_req) |
3299 | goto out; | |
3300 | ||
c99d2d4a | 3301 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
3302 | class_name, method_name); |
3303 | if (outbound_size) { | |
3304 | struct ceph_pagelist *pagelist; | |
3305 | ||
3306 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
3307 | if (!pagelist) | |
3308 | goto out; | |
3309 | ||
3310 | ceph_pagelist_init(pagelist); | |
3311 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
3312 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
3313 | pagelist); | |
3314 | } | |
a4ce40a9 AE |
3315 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
3316 | obj_request->pages, inbound_size, | |
44cd188d | 3317 | 0, false, false); |
9d4df01f | 3318 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3319 | |
36be9a76 AE |
3320 | ret = rbd_obj_request_submit(osdc, obj_request); |
3321 | if (ret) | |
3322 | goto out; | |
3323 | ret = rbd_obj_request_wait(obj_request); | |
3324 | if (ret) | |
3325 | goto out; | |
3326 | ||
3327 | ret = obj_request->result; | |
3328 | if (ret < 0) | |
3329 | goto out; | |
57385b51 AE |
3330 | |
3331 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
3332 | ret = (int)obj_request->xferred; | |
903bb32e | 3333 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
3334 | out: |
3335 | if (obj_request) | |
3336 | rbd_obj_request_put(obj_request); | |
3337 | else | |
3338 | ceph_release_page_vector(pages, page_count); | |
3339 | ||
3340 | return ret; | |
3341 | } | |
3342 | ||
7ad18afa | 3343 | static void rbd_queue_workfn(struct work_struct *work) |
bf0d5f50 | 3344 | { |
7ad18afa CH |
3345 | struct request *rq = blk_mq_rq_from_pdu(work); |
3346 | struct rbd_device *rbd_dev = rq->q->queuedata; | |
bc1ecc65 | 3347 | struct rbd_img_request *img_request; |
4e752f0a | 3348 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3349 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3350 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3351 | enum obj_operation_type op_type; |
4e752f0a | 3352 | u64 mapping_size; |
bf0d5f50 AE |
3353 | int result; |
3354 | ||
7ad18afa CH |
3355 | if (rq->cmd_type != REQ_TYPE_FS) { |
3356 | dout("%s: non-fs request type %d\n", __func__, | |
3357 | (int) rq->cmd_type); | |
3358 | result = -EIO; | |
3359 | goto err; | |
3360 | } | |
3361 | ||
c2df40df | 3362 | if (req_op(rq) == REQ_OP_DISCARD) |
90e98c52 | 3363 | op_type = OBJ_OP_DISCARD; |
c2df40df | 3364 | else if (req_op(rq) == REQ_OP_WRITE) |
6d2940c8 GZ |
3365 | op_type = OBJ_OP_WRITE; |
3366 | else | |
3367 | op_type = OBJ_OP_READ; | |
3368 | ||
bc1ecc65 | 3369 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3370 | |
bc1ecc65 ID |
3371 | if (!length) { |
3372 | dout("%s: zero-length request\n", __func__); | |
3373 | result = 0; | |
3374 | goto err_rq; | |
3375 | } | |
bf0d5f50 | 3376 | |
6d2940c8 | 3377 | /* Only reads are allowed to a read-only device */ |
bc1ecc65 | 3378 | |
6d2940c8 | 3379 | if (op_type != OBJ_OP_READ) { |
bc1ecc65 ID |
3380 | if (rbd_dev->mapping.read_only) { |
3381 | result = -EROFS; | |
3382 | goto err_rq; | |
4dda41d3 | 3383 | } |
bc1ecc65 ID |
3384 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
3385 | } | |
4dda41d3 | 3386 | |
bc1ecc65 ID |
3387 | /* |
3388 | * Quit early if the mapped snapshot no longer exists. It's | |
3389 | * still possible the snapshot will have disappeared by the | |
3390 | * time our request arrives at the osd, but there's no sense in | |
3391 | * sending it if we already know. | |
3392 | */ | |
3393 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3394 | dout("request for non-existent snapshot"); | |
3395 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3396 | result = -ENXIO; | |
3397 | goto err_rq; | |
3398 | } | |
4dda41d3 | 3399 | |
bc1ecc65 ID |
3400 | if (offset && length > U64_MAX - offset + 1) { |
3401 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3402 | length); | |
3403 | result = -EINVAL; | |
3404 | goto err_rq; /* Shouldn't happen */ | |
3405 | } | |
4dda41d3 | 3406 | |
7ad18afa CH |
3407 | blk_mq_start_request(rq); |
3408 | ||
4e752f0a JD |
3409 | down_read(&rbd_dev->header_rwsem); |
3410 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3411 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3412 | snapc = rbd_dev->header.snapc; |
3413 | ceph_get_snap_context(snapc); | |
3414 | } | |
3415 | up_read(&rbd_dev->header_rwsem); | |
3416 | ||
3417 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3418 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3419 | length, mapping_size); |
bc1ecc65 ID |
3420 | result = -EIO; |
3421 | goto err_rq; | |
3422 | } | |
bf0d5f50 | 3423 | |
6d2940c8 | 3424 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
4e752f0a | 3425 | snapc); |
bc1ecc65 ID |
3426 | if (!img_request) { |
3427 | result = -ENOMEM; | |
3428 | goto err_rq; | |
3429 | } | |
3430 | img_request->rq = rq; | |
70b16db8 | 3431 | snapc = NULL; /* img_request consumes a ref */ |
bf0d5f50 | 3432 | |
90e98c52 GZ |
3433 | if (op_type == OBJ_OP_DISCARD) |
3434 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, | |
3435 | NULL); | |
3436 | else | |
3437 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
3438 | rq->bio); | |
bc1ecc65 ID |
3439 | if (result) |
3440 | goto err_img_request; | |
bf0d5f50 | 3441 | |
bc1ecc65 ID |
3442 | result = rbd_img_request_submit(img_request); |
3443 | if (result) | |
3444 | goto err_img_request; | |
bf0d5f50 | 3445 | |
bc1ecc65 | 3446 | return; |
bf0d5f50 | 3447 | |
bc1ecc65 ID |
3448 | err_img_request: |
3449 | rbd_img_request_put(img_request); | |
3450 | err_rq: | |
3451 | if (result) | |
3452 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3453 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3454 | ceph_put_snap_context(snapc); |
7ad18afa CH |
3455 | err: |
3456 | blk_mq_end_request(rq, result); | |
bc1ecc65 | 3457 | } |
bf0d5f50 | 3458 | |
7ad18afa CH |
3459 | static int rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
3460 | const struct blk_mq_queue_data *bd) | |
bc1ecc65 | 3461 | { |
7ad18afa CH |
3462 | struct request *rq = bd->rq; |
3463 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
bf0d5f50 | 3464 | |
7ad18afa CH |
3465 | queue_work(rbd_wq, work); |
3466 | return BLK_MQ_RQ_QUEUE_OK; | |
bf0d5f50 AE |
3467 | } |
3468 | ||
602adf40 YS |
3469 | static void rbd_free_disk(struct rbd_device *rbd_dev) |
3470 | { | |
3471 | struct gendisk *disk = rbd_dev->disk; | |
3472 | ||
3473 | if (!disk) | |
3474 | return; | |
3475 | ||
a0cab924 AE |
3476 | rbd_dev->disk = NULL; |
3477 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 3478 | del_gendisk(disk); |
a0cab924 AE |
3479 | if (disk->queue) |
3480 | blk_cleanup_queue(disk->queue); | |
7ad18afa | 3481 | blk_mq_free_tag_set(&rbd_dev->tag_set); |
a0cab924 | 3482 | } |
602adf40 YS |
3483 | put_disk(disk); |
3484 | } | |
3485 | ||
788e2df3 AE |
3486 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
3487 | const char *object_name, | |
7097f8df | 3488 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
3489 | |
3490 | { | |
2169238d | 3491 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 3492 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
3493 | struct page **pages = NULL; |
3494 | u32 page_count; | |
1ceae7ef | 3495 | size_t size; |
788e2df3 AE |
3496 | int ret; |
3497 | ||
3498 | page_count = (u32) calc_pages_for(offset, length); | |
3499 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
3500 | if (IS_ERR(pages)) | |
a8d42056 | 3501 | return PTR_ERR(pages); |
788e2df3 AE |
3502 | |
3503 | ret = -ENOMEM; | |
3504 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 3505 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
3506 | if (!obj_request) |
3507 | goto out; | |
3508 | ||
3509 | obj_request->pages = pages; | |
3510 | obj_request->page_count = page_count; | |
3511 | ||
6d2940c8 | 3512 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 3513 | obj_request); |
788e2df3 AE |
3514 | if (!obj_request->osd_req) |
3515 | goto out; | |
3516 | ||
c99d2d4a AE |
3517 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
3518 | offset, length, 0, 0); | |
406e2c9f | 3519 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 3520 | obj_request->pages, |
44cd188d AE |
3521 | obj_request->length, |
3522 | obj_request->offset & ~PAGE_MASK, | |
3523 | false, false); | |
9d4df01f | 3524 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3525 | |
788e2df3 AE |
3526 | ret = rbd_obj_request_submit(osdc, obj_request); |
3527 | if (ret) | |
3528 | goto out; | |
3529 | ret = rbd_obj_request_wait(obj_request); | |
3530 | if (ret) | |
3531 | goto out; | |
3532 | ||
3533 | ret = obj_request->result; | |
3534 | if (ret < 0) | |
3535 | goto out; | |
1ceae7ef AE |
3536 | |
3537 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
3538 | size = (size_t) obj_request->xferred; | |
903bb32e | 3539 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
3540 | rbd_assert(size <= (size_t)INT_MAX); |
3541 | ret = (int)size; | |
788e2df3 AE |
3542 | out: |
3543 | if (obj_request) | |
3544 | rbd_obj_request_put(obj_request); | |
3545 | else | |
3546 | ceph_release_page_vector(pages, page_count); | |
3547 | ||
3548 | return ret; | |
3549 | } | |
3550 | ||
602adf40 | 3551 | /* |
662518b1 AE |
3552 | * Read the complete header for the given rbd device. On successful |
3553 | * return, the rbd_dev->header field will contain up-to-date | |
3554 | * information about the image. | |
602adf40 | 3555 | */ |
99a41ebc | 3556 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3557 | { |
4156d998 | 3558 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3559 | u32 snap_count = 0; |
4156d998 AE |
3560 | u64 names_size = 0; |
3561 | u32 want_count; | |
3562 | int ret; | |
602adf40 | 3563 | |
00f1f36f | 3564 | /* |
4156d998 AE |
3565 | * The complete header will include an array of its 64-bit |
3566 | * snapshot ids, followed by the names of those snapshots as | |
3567 | * a contiguous block of NUL-terminated strings. Note that | |
3568 | * the number of snapshots could change by the time we read | |
3569 | * it in, in which case we re-read it. | |
00f1f36f | 3570 | */ |
4156d998 AE |
3571 | do { |
3572 | size_t size; | |
3573 | ||
3574 | kfree(ondisk); | |
3575 | ||
3576 | size = sizeof (*ondisk); | |
3577 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3578 | size += names_size; | |
3579 | ondisk = kmalloc(size, GFP_KERNEL); | |
3580 | if (!ondisk) | |
662518b1 | 3581 | return -ENOMEM; |
4156d998 | 3582 | |
c41d13a3 | 3583 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_oid.name, |
7097f8df | 3584 | 0, size, ondisk); |
4156d998 | 3585 | if (ret < 0) |
662518b1 | 3586 | goto out; |
c0cd10db | 3587 | if ((size_t)ret < size) { |
4156d998 | 3588 | ret = -ENXIO; |
06ecc6cb AE |
3589 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3590 | size, ret); | |
662518b1 | 3591 | goto out; |
4156d998 AE |
3592 | } |
3593 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3594 | ret = -ENXIO; | |
06ecc6cb | 3595 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3596 | goto out; |
81e759fb | 3597 | } |
602adf40 | 3598 | |
4156d998 AE |
3599 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3600 | want_count = snap_count; | |
3601 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3602 | } while (snap_count != want_count); | |
00f1f36f | 3603 | |
662518b1 AE |
3604 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3605 | out: | |
4156d998 AE |
3606 | kfree(ondisk); |
3607 | ||
3608 | return ret; | |
602adf40 YS |
3609 | } |
3610 | ||
15228ede AE |
3611 | /* |
3612 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3613 | * has disappeared from the (just updated) snapshot context. | |
3614 | */ | |
3615 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3616 | { | |
3617 | u64 snap_id; | |
3618 | ||
3619 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3620 | return; | |
3621 | ||
3622 | snap_id = rbd_dev->spec->snap_id; | |
3623 | if (snap_id == CEPH_NOSNAP) | |
3624 | return; | |
3625 | ||
3626 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3627 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3628 | } | |
3629 | ||
9875201e JD |
3630 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3631 | { | |
3632 | sector_t size; | |
9875201e JD |
3633 | |
3634 | /* | |
811c6688 ID |
3635 | * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
3636 | * try to update its size. If REMOVING is set, updating size | |
3637 | * is just useless work since the device can't be opened. | |
9875201e | 3638 | */ |
811c6688 ID |
3639 | if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
3640 | !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { | |
9875201e JD |
3641 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
3642 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3643 | set_capacity(rbd_dev->disk, size); | |
3644 | revalidate_disk(rbd_dev->disk); | |
3645 | } | |
3646 | } | |
3647 | ||
cc4a38bd | 3648 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3649 | { |
e627db08 | 3650 | u64 mapping_size; |
1fe5e993 AE |
3651 | int ret; |
3652 | ||
cfbf6377 | 3653 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3654 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3655 | |
3656 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b | 3657 | if (ret) |
73e39e4d | 3658 | goto out; |
15228ede | 3659 | |
e8f59b59 ID |
3660 | /* |
3661 | * If there is a parent, see if it has disappeared due to the | |
3662 | * mapped image getting flattened. | |
3663 | */ | |
3664 | if (rbd_dev->parent) { | |
3665 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3666 | if (ret) | |
73e39e4d | 3667 | goto out; |
e8f59b59 ID |
3668 | } |
3669 | ||
5ff1108c | 3670 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
73e39e4d | 3671 | rbd_dev->mapping.size = rbd_dev->header.image_size; |
5ff1108c ID |
3672 | } else { |
3673 | /* validate mapped snapshot's EXISTS flag */ | |
3674 | rbd_exists_validate(rbd_dev); | |
3675 | } | |
15228ede | 3676 | |
73e39e4d | 3677 | out: |
cfbf6377 | 3678 | up_write(&rbd_dev->header_rwsem); |
73e39e4d | 3679 | if (!ret && mapping_size != rbd_dev->mapping.size) |
9875201e | 3680 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3681 | |
73e39e4d | 3682 | return ret; |
1fe5e993 AE |
3683 | } |
3684 | ||
7ad18afa CH |
3685 | static int rbd_init_request(void *data, struct request *rq, |
3686 | unsigned int hctx_idx, unsigned int request_idx, | |
3687 | unsigned int numa_node) | |
3688 | { | |
3689 | struct work_struct *work = blk_mq_rq_to_pdu(rq); | |
3690 | ||
3691 | INIT_WORK(work, rbd_queue_workfn); | |
3692 | return 0; | |
3693 | } | |
3694 | ||
3695 | static struct blk_mq_ops rbd_mq_ops = { | |
3696 | .queue_rq = rbd_queue_rq, | |
3697 | .map_queue = blk_mq_map_queue, | |
3698 | .init_request = rbd_init_request, | |
3699 | }; | |
3700 | ||
602adf40 YS |
3701 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3702 | { | |
3703 | struct gendisk *disk; | |
3704 | struct request_queue *q; | |
593a9e7b | 3705 | u64 segment_size; |
7ad18afa | 3706 | int err; |
602adf40 | 3707 | |
602adf40 | 3708 | /* create gendisk info */ |
7e513d43 ID |
3709 | disk = alloc_disk(single_major ? |
3710 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3711 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3712 | if (!disk) |
1fcdb8aa | 3713 | return -ENOMEM; |
602adf40 | 3714 | |
f0f8cef5 | 3715 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3716 | rbd_dev->dev_id); |
602adf40 | 3717 | disk->major = rbd_dev->major; |
dd82fff1 | 3718 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3719 | if (single_major) |
3720 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3721 | disk->fops = &rbd_bd_ops; |
3722 | disk->private_data = rbd_dev; | |
3723 | ||
7ad18afa CH |
3724 | memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
3725 | rbd_dev->tag_set.ops = &rbd_mq_ops; | |
b5584180 | 3726 | rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
7ad18afa | 3727 | rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
b5584180 | 3728 | rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
7ad18afa CH |
3729 | rbd_dev->tag_set.nr_hw_queues = 1; |
3730 | rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); | |
3731 | ||
3732 | err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); | |
3733 | if (err) | |
602adf40 | 3734 | goto out_disk; |
029bcbd8 | 3735 | |
7ad18afa CH |
3736 | q = blk_mq_init_queue(&rbd_dev->tag_set); |
3737 | if (IS_ERR(q)) { | |
3738 | err = PTR_ERR(q); | |
3739 | goto out_tag_set; | |
3740 | } | |
3741 | ||
d8a2c89c ID |
3742 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
3743 | /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ | |
593a9e7b | 3744 | |
029bcbd8 | 3745 | /* set io sizes to object size */ |
593a9e7b AE |
3746 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3747 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
0d9fde4f | 3748 | q->limits.max_sectors = queue_max_hw_sectors(q); |
d3834fef | 3749 | blk_queue_max_segments(q, segment_size / SECTOR_SIZE); |
593a9e7b AE |
3750 | blk_queue_max_segment_size(q, segment_size); |
3751 | blk_queue_io_min(q, segment_size); | |
3752 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3753 | |
90e98c52 GZ |
3754 | /* enable the discard support */ |
3755 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
3756 | q->limits.discard_granularity = segment_size; | |
3757 | q->limits.discard_alignment = segment_size; | |
2bb4cd5c | 3758 | blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
b76f8239 | 3759 | q->limits.discard_zeroes_data = 1; |
90e98c52 | 3760 | |
bae818ee RH |
3761 | if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
3762 | q->backing_dev_info.capabilities |= BDI_CAP_STABLE_WRITES; | |
3763 | ||
602adf40 YS |
3764 | disk->queue = q; |
3765 | ||
3766 | q->queuedata = rbd_dev; | |
3767 | ||
3768 | rbd_dev->disk = disk; | |
602adf40 | 3769 | |
602adf40 | 3770 | return 0; |
7ad18afa CH |
3771 | out_tag_set: |
3772 | blk_mq_free_tag_set(&rbd_dev->tag_set); | |
602adf40 YS |
3773 | out_disk: |
3774 | put_disk(disk); | |
7ad18afa | 3775 | return err; |
602adf40 YS |
3776 | } |
3777 | ||
dfc5606d YS |
3778 | /* |
3779 | sysfs | |
3780 | */ | |
3781 | ||
593a9e7b AE |
3782 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3783 | { | |
3784 | return container_of(dev, struct rbd_device, dev); | |
3785 | } | |
3786 | ||
dfc5606d YS |
3787 | static ssize_t rbd_size_show(struct device *dev, |
3788 | struct device_attribute *attr, char *buf) | |
3789 | { | |
593a9e7b | 3790 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3791 | |
fc71d833 AE |
3792 | return sprintf(buf, "%llu\n", |
3793 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3794 | } |
3795 | ||
34b13184 AE |
3796 | /* |
3797 | * Note this shows the features for whatever's mapped, which is not | |
3798 | * necessarily the base image. | |
3799 | */ | |
3800 | static ssize_t rbd_features_show(struct device *dev, | |
3801 | struct device_attribute *attr, char *buf) | |
3802 | { | |
3803 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3804 | ||
3805 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3806 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3807 | } |
3808 | ||
dfc5606d YS |
3809 | static ssize_t rbd_major_show(struct device *dev, |
3810 | struct device_attribute *attr, char *buf) | |
3811 | { | |
593a9e7b | 3812 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3813 | |
fc71d833 AE |
3814 | if (rbd_dev->major) |
3815 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3816 | ||
3817 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
3818 | } |
3819 | ||
3820 | static ssize_t rbd_minor_show(struct device *dev, | |
3821 | struct device_attribute *attr, char *buf) | |
3822 | { | |
3823 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 3824 | |
dd82fff1 | 3825 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
3826 | } |
3827 | ||
3828 | static ssize_t rbd_client_id_show(struct device *dev, | |
3829 | struct device_attribute *attr, char *buf) | |
602adf40 | 3830 | { |
593a9e7b | 3831 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3832 | |
1dbb4399 | 3833 | return sprintf(buf, "client%lld\n", |
033268a5 | 3834 | ceph_client_gid(rbd_dev->rbd_client->client)); |
602adf40 YS |
3835 | } |
3836 | ||
dfc5606d YS |
3837 | static ssize_t rbd_pool_show(struct device *dev, |
3838 | struct device_attribute *attr, char *buf) | |
602adf40 | 3839 | { |
593a9e7b | 3840 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3841 | |
0d7dbfce | 3842 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3843 | } |
3844 | ||
9bb2f334 AE |
3845 | static ssize_t rbd_pool_id_show(struct device *dev, |
3846 | struct device_attribute *attr, char *buf) | |
3847 | { | |
3848 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3849 | ||
0d7dbfce | 3850 | return sprintf(buf, "%llu\n", |
fc71d833 | 3851 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3852 | } |
3853 | ||
dfc5606d YS |
3854 | static ssize_t rbd_name_show(struct device *dev, |
3855 | struct device_attribute *attr, char *buf) | |
3856 | { | |
593a9e7b | 3857 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3858 | |
a92ffdf8 AE |
3859 | if (rbd_dev->spec->image_name) |
3860 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3861 | ||
3862 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3863 | } |
3864 | ||
589d30e0 AE |
3865 | static ssize_t rbd_image_id_show(struct device *dev, |
3866 | struct device_attribute *attr, char *buf) | |
3867 | { | |
3868 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3869 | ||
0d7dbfce | 3870 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3871 | } |
3872 | ||
34b13184 AE |
3873 | /* |
3874 | * Shows the name of the currently-mapped snapshot (or | |
3875 | * RBD_SNAP_HEAD_NAME for the base image). | |
3876 | */ | |
dfc5606d YS |
3877 | static ssize_t rbd_snap_show(struct device *dev, |
3878 | struct device_attribute *attr, | |
3879 | char *buf) | |
3880 | { | |
593a9e7b | 3881 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3882 | |
0d7dbfce | 3883 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3884 | } |
3885 | ||
86b00e0d | 3886 | /* |
ff96128f ID |
3887 | * For a v2 image, shows the chain of parent images, separated by empty |
3888 | * lines. For v1 images or if there is no parent, shows "(no parent | |
3889 | * image)". | |
86b00e0d AE |
3890 | */ |
3891 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
3892 | struct device_attribute *attr, |
3893 | char *buf) | |
86b00e0d AE |
3894 | { |
3895 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 3896 | ssize_t count = 0; |
86b00e0d | 3897 | |
ff96128f | 3898 | if (!rbd_dev->parent) |
86b00e0d AE |
3899 | return sprintf(buf, "(no parent image)\n"); |
3900 | ||
ff96128f ID |
3901 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
3902 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3903 | ||
3904 | count += sprintf(&buf[count], "%s" | |
3905 | "pool_id %llu\npool_name %s\n" | |
3906 | "image_id %s\nimage_name %s\n" | |
3907 | "snap_id %llu\nsnap_name %s\n" | |
3908 | "overlap %llu\n", | |
3909 | !count ? "" : "\n", /* first? */ | |
3910 | spec->pool_id, spec->pool_name, | |
3911 | spec->image_id, spec->image_name ?: "(unknown)", | |
3912 | spec->snap_id, spec->snap_name, | |
3913 | rbd_dev->parent_overlap); | |
3914 | } | |
3915 | ||
3916 | return count; | |
86b00e0d AE |
3917 | } |
3918 | ||
dfc5606d YS |
3919 | static ssize_t rbd_image_refresh(struct device *dev, |
3920 | struct device_attribute *attr, | |
3921 | const char *buf, | |
3922 | size_t size) | |
3923 | { | |
593a9e7b | 3924 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3925 | int ret; |
602adf40 | 3926 | |
cc4a38bd | 3927 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 3928 | if (ret) |
52bb1f9b | 3929 | return ret; |
b813623a | 3930 | |
52bb1f9b | 3931 | return size; |
dfc5606d | 3932 | } |
602adf40 | 3933 | |
dfc5606d | 3934 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3935 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 3936 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 3937 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
dfc5606d YS |
3938 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
3939 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3940 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3941 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3942 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3943 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3944 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3945 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3946 | |
3947 | static struct attribute *rbd_attrs[] = { | |
3948 | &dev_attr_size.attr, | |
34b13184 | 3949 | &dev_attr_features.attr, |
dfc5606d | 3950 | &dev_attr_major.attr, |
dd82fff1 | 3951 | &dev_attr_minor.attr, |
dfc5606d YS |
3952 | &dev_attr_client_id.attr, |
3953 | &dev_attr_pool.attr, | |
9bb2f334 | 3954 | &dev_attr_pool_id.attr, |
dfc5606d | 3955 | &dev_attr_name.attr, |
589d30e0 | 3956 | &dev_attr_image_id.attr, |
dfc5606d | 3957 | &dev_attr_current_snap.attr, |
86b00e0d | 3958 | &dev_attr_parent.attr, |
dfc5606d | 3959 | &dev_attr_refresh.attr, |
dfc5606d YS |
3960 | NULL |
3961 | }; | |
3962 | ||
3963 | static struct attribute_group rbd_attr_group = { | |
3964 | .attrs = rbd_attrs, | |
3965 | }; | |
3966 | ||
3967 | static const struct attribute_group *rbd_attr_groups[] = { | |
3968 | &rbd_attr_group, | |
3969 | NULL | |
3970 | }; | |
3971 | ||
6cac4695 | 3972 | static void rbd_dev_release(struct device *dev); |
dfc5606d YS |
3973 | |
3974 | static struct device_type rbd_device_type = { | |
3975 | .name = "rbd", | |
3976 | .groups = rbd_attr_groups, | |
6cac4695 | 3977 | .release = rbd_dev_release, |
dfc5606d YS |
3978 | }; |
3979 | ||
8b8fb99c AE |
3980 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3981 | { | |
3982 | kref_get(&spec->kref); | |
3983 | ||
3984 | return spec; | |
3985 | } | |
3986 | ||
3987 | static void rbd_spec_free(struct kref *kref); | |
3988 | static void rbd_spec_put(struct rbd_spec *spec) | |
3989 | { | |
3990 | if (spec) | |
3991 | kref_put(&spec->kref, rbd_spec_free); | |
3992 | } | |
3993 | ||
3994 | static struct rbd_spec *rbd_spec_alloc(void) | |
3995 | { | |
3996 | struct rbd_spec *spec; | |
3997 | ||
3998 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3999 | if (!spec) | |
4000 | return NULL; | |
04077599 ID |
4001 | |
4002 | spec->pool_id = CEPH_NOPOOL; | |
4003 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4004 | kref_init(&spec->kref); |
4005 | ||
8b8fb99c AE |
4006 | return spec; |
4007 | } | |
4008 | ||
4009 | static void rbd_spec_free(struct kref *kref) | |
4010 | { | |
4011 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4012 | ||
4013 | kfree(spec->pool_name); | |
4014 | kfree(spec->image_id); | |
4015 | kfree(spec->image_name); | |
4016 | kfree(spec->snap_name); | |
4017 | kfree(spec); | |
4018 | } | |
4019 | ||
1643dfa4 | 4020 | static void rbd_dev_free(struct rbd_device *rbd_dev) |
dd5ac32d | 4021 | { |
99d16943 ID |
4022 | WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
4023 | ||
c41d13a3 | 4024 | ceph_oid_destroy(&rbd_dev->header_oid); |
6b6dddbe | 4025 | ceph_oloc_destroy(&rbd_dev->header_oloc); |
c41d13a3 | 4026 | |
dd5ac32d ID |
4027 | rbd_put_client(rbd_dev->rbd_client); |
4028 | rbd_spec_put(rbd_dev->spec); | |
4029 | kfree(rbd_dev->opts); | |
4030 | kfree(rbd_dev); | |
1643dfa4 ID |
4031 | } |
4032 | ||
4033 | static void rbd_dev_release(struct device *dev) | |
4034 | { | |
4035 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
4036 | bool need_put = !!rbd_dev->opts; | |
4037 | ||
4038 | if (need_put) { | |
4039 | destroy_workqueue(rbd_dev->task_wq); | |
4040 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4041 | } | |
4042 | ||
4043 | rbd_dev_free(rbd_dev); | |
dd5ac32d ID |
4044 | |
4045 | /* | |
4046 | * This is racy, but way better than putting module outside of | |
4047 | * the release callback. The race window is pretty small, so | |
4048 | * doing something similar to dm (dm-builtin.c) is overkill. | |
4049 | */ | |
4050 | if (need_put) | |
4051 | module_put(THIS_MODULE); | |
4052 | } | |
4053 | ||
1643dfa4 ID |
4054 | static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
4055 | struct rbd_spec *spec) | |
c53d5893 AE |
4056 | { |
4057 | struct rbd_device *rbd_dev; | |
4058 | ||
1643dfa4 | 4059 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
c53d5893 AE |
4060 | if (!rbd_dev) |
4061 | return NULL; | |
4062 | ||
4063 | spin_lock_init(&rbd_dev->lock); | |
4064 | INIT_LIST_HEAD(&rbd_dev->node); | |
c53d5893 AE |
4065 | init_rwsem(&rbd_dev->header_rwsem); |
4066 | ||
c41d13a3 | 4067 | ceph_oid_init(&rbd_dev->header_oid); |
922dab61 | 4068 | ceph_oloc_init(&rbd_dev->header_oloc); |
c41d13a3 | 4069 | |
99d16943 ID |
4070 | mutex_init(&rbd_dev->watch_mutex); |
4071 | rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; | |
4072 | INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); | |
4073 | ||
dd5ac32d ID |
4074 | rbd_dev->dev.bus = &rbd_bus_type; |
4075 | rbd_dev->dev.type = &rbd_device_type; | |
4076 | rbd_dev->dev.parent = &rbd_root_dev; | |
dd5ac32d ID |
4077 | device_initialize(&rbd_dev->dev); |
4078 | ||
c53d5893 | 4079 | rbd_dev->rbd_client = rbdc; |
d147543d | 4080 | rbd_dev->spec = spec; |
0903e875 | 4081 | |
7627151e YZ |
4082 | rbd_dev->layout.stripe_unit = 1 << RBD_MAX_OBJ_ORDER; |
4083 | rbd_dev->layout.stripe_count = 1; | |
4084 | rbd_dev->layout.object_size = 1 << RBD_MAX_OBJ_ORDER; | |
4085 | rbd_dev->layout.pool_id = spec->pool_id; | |
30c156d9 | 4086 | RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
0903e875 | 4087 | |
1643dfa4 ID |
4088 | return rbd_dev; |
4089 | } | |
4090 | ||
4091 | /* | |
4092 | * Create a mapping rbd_dev. | |
4093 | */ | |
4094 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, | |
4095 | struct rbd_spec *spec, | |
4096 | struct rbd_options *opts) | |
4097 | { | |
4098 | struct rbd_device *rbd_dev; | |
4099 | ||
4100 | rbd_dev = __rbd_dev_create(rbdc, spec); | |
4101 | if (!rbd_dev) | |
4102 | return NULL; | |
4103 | ||
4104 | rbd_dev->opts = opts; | |
4105 | ||
4106 | /* get an id and fill in device name */ | |
4107 | rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, | |
4108 | minor_to_rbd_dev_id(1 << MINORBITS), | |
4109 | GFP_KERNEL); | |
4110 | if (rbd_dev->dev_id < 0) | |
4111 | goto fail_rbd_dev; | |
4112 | ||
4113 | sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); | |
4114 | rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, | |
4115 | rbd_dev->name); | |
4116 | if (!rbd_dev->task_wq) | |
4117 | goto fail_dev_id; | |
dd5ac32d | 4118 | |
1643dfa4 ID |
4119 | /* we have a ref from do_rbd_add() */ |
4120 | __module_get(THIS_MODULE); | |
4121 | ||
4122 | dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); | |
c53d5893 | 4123 | return rbd_dev; |
1643dfa4 ID |
4124 | |
4125 | fail_dev_id: | |
4126 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); | |
4127 | fail_rbd_dev: | |
4128 | rbd_dev_free(rbd_dev); | |
4129 | return NULL; | |
c53d5893 AE |
4130 | } |
4131 | ||
4132 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4133 | { | |
dd5ac32d ID |
4134 | if (rbd_dev) |
4135 | put_device(&rbd_dev->dev); | |
c53d5893 AE |
4136 | } |
4137 | ||
9d475de5 AE |
4138 | /* |
4139 | * Get the size and object order for an image snapshot, or if | |
4140 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4141 | * image. | |
4142 | */ | |
4143 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4144 | u8 *order, u64 *snap_size) | |
4145 | { | |
4146 | __le64 snapid = cpu_to_le64(snap_id); | |
4147 | int ret; | |
4148 | struct { | |
4149 | u8 order; | |
4150 | __le64 size; | |
4151 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4152 | ||
c41d13a3 | 4153 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
9d475de5 | 4154 | "rbd", "get_size", |
4157976b | 4155 | &snapid, sizeof (snapid), |
e2a58ee5 | 4156 | &size_buf, sizeof (size_buf)); |
36be9a76 | 4157 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4158 | if (ret < 0) |
4159 | return ret; | |
57385b51 AE |
4160 | if (ret < sizeof (size_buf)) |
4161 | return -ERANGE; | |
9d475de5 | 4162 | |
c3545579 | 4163 | if (order) { |
c86f86e9 | 4164 | *order = size_buf.order; |
c3545579 JD |
4165 | dout(" order %u", (unsigned int)*order); |
4166 | } | |
9d475de5 AE |
4167 | *snap_size = le64_to_cpu(size_buf.size); |
4168 | ||
c3545579 JD |
4169 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4170 | (unsigned long long)snap_id, | |
57385b51 | 4171 | (unsigned long long)*snap_size); |
9d475de5 AE |
4172 | |
4173 | return 0; | |
4174 | } | |
4175 | ||
4176 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4177 | { | |
4178 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4179 | &rbd_dev->header.obj_order, | |
4180 | &rbd_dev->header.image_size); | |
4181 | } | |
4182 | ||
1e130199 AE |
4183 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4184 | { | |
4185 | void *reply_buf; | |
4186 | int ret; | |
4187 | void *p; | |
4188 | ||
4189 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4190 | if (!reply_buf) | |
4191 | return -ENOMEM; | |
4192 | ||
c41d13a3 | 4193 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
4157976b | 4194 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 4195 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 4196 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4197 | if (ret < 0) |
4198 | goto out; | |
4199 | ||
4200 | p = reply_buf; | |
4201 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4202 | p + ret, NULL, GFP_NOIO); |
4203 | ret = 0; | |
1e130199 AE |
4204 | |
4205 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4206 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4207 | rbd_dev->header.object_prefix = NULL; | |
4208 | } else { | |
4209 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4210 | } | |
1e130199 AE |
4211 | out: |
4212 | kfree(reply_buf); | |
4213 | ||
4214 | return ret; | |
4215 | } | |
4216 | ||
b1b5402a AE |
4217 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4218 | u64 *snap_features) | |
4219 | { | |
4220 | __le64 snapid = cpu_to_le64(snap_id); | |
4221 | struct { | |
4222 | __le64 features; | |
4223 | __le64 incompat; | |
4157976b | 4224 | } __attribute__ ((packed)) features_buf = { 0 }; |
d3767f0f | 4225 | u64 unsup; |
b1b5402a AE |
4226 | int ret; |
4227 | ||
c41d13a3 | 4228 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
b1b5402a | 4229 | "rbd", "get_features", |
4157976b | 4230 | &snapid, sizeof (snapid), |
e2a58ee5 | 4231 | &features_buf, sizeof (features_buf)); |
36be9a76 | 4232 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4233 | if (ret < 0) |
4234 | return ret; | |
57385b51 AE |
4235 | if (ret < sizeof (features_buf)) |
4236 | return -ERANGE; | |
d889140c | 4237 | |
d3767f0f ID |
4238 | unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
4239 | if (unsup) { | |
4240 | rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", | |
4241 | unsup); | |
b8f5c6ed | 4242 | return -ENXIO; |
d3767f0f | 4243 | } |
d889140c | 4244 | |
b1b5402a AE |
4245 | *snap_features = le64_to_cpu(features_buf.features); |
4246 | ||
4247 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4248 | (unsigned long long)snap_id, |
4249 | (unsigned long long)*snap_features, | |
4250 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4251 | |
4252 | return 0; | |
4253 | } | |
4254 | ||
4255 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4256 | { | |
4257 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4258 | &rbd_dev->header.features); | |
4259 | } | |
4260 | ||
86b00e0d AE |
4261 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4262 | { | |
4263 | struct rbd_spec *parent_spec; | |
4264 | size_t size; | |
4265 | void *reply_buf = NULL; | |
4266 | __le64 snapid; | |
4267 | void *p; | |
4268 | void *end; | |
642a2537 | 4269 | u64 pool_id; |
86b00e0d | 4270 | char *image_id; |
3b5cf2a2 | 4271 | u64 snap_id; |
86b00e0d | 4272 | u64 overlap; |
86b00e0d AE |
4273 | int ret; |
4274 | ||
4275 | parent_spec = rbd_spec_alloc(); | |
4276 | if (!parent_spec) | |
4277 | return -ENOMEM; | |
4278 | ||
4279 | size = sizeof (__le64) + /* pool_id */ | |
4280 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4281 | sizeof (__le64) + /* snap_id */ | |
4282 | sizeof (__le64); /* overlap */ | |
4283 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4284 | if (!reply_buf) { | |
4285 | ret = -ENOMEM; | |
4286 | goto out_err; | |
4287 | } | |
4288 | ||
4d9b67cd | 4289 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
c41d13a3 | 4290 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
86b00e0d | 4291 | "rbd", "get_parent", |
4157976b | 4292 | &snapid, sizeof (snapid), |
e2a58ee5 | 4293 | reply_buf, size); |
36be9a76 | 4294 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4295 | if (ret < 0) |
4296 | goto out_err; | |
4297 | ||
86b00e0d | 4298 | p = reply_buf; |
57385b51 AE |
4299 | end = reply_buf + ret; |
4300 | ret = -ERANGE; | |
642a2537 | 4301 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4302 | if (pool_id == CEPH_NOPOOL) { |
4303 | /* | |
4304 | * Either the parent never existed, or we have | |
4305 | * record of it but the image got flattened so it no | |
4306 | * longer has a parent. When the parent of a | |
4307 | * layered image disappears we immediately set the | |
4308 | * overlap to 0. The effect of this is that all new | |
4309 | * requests will be treated as if the image had no | |
4310 | * parent. | |
4311 | */ | |
4312 | if (rbd_dev->parent_overlap) { | |
4313 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4314 | rbd_dev_parent_put(rbd_dev); |
4315 | pr_info("%s: clone image has been flattened\n", | |
4316 | rbd_dev->disk->disk_name); | |
4317 | } | |
4318 | ||
86b00e0d | 4319 | goto out; /* No parent? No problem. */ |
392a9dad | 4320 | } |
86b00e0d | 4321 | |
0903e875 AE |
4322 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4323 | ||
4324 | ret = -EIO; | |
642a2537 | 4325 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4326 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4327 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4328 | goto out_err; |
c0cd10db | 4329 | } |
0903e875 | 4330 | |
979ed480 | 4331 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4332 | if (IS_ERR(image_id)) { |
4333 | ret = PTR_ERR(image_id); | |
4334 | goto out_err; | |
4335 | } | |
3b5cf2a2 | 4336 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4337 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4338 | ||
3b5cf2a2 AE |
4339 | /* |
4340 | * The parent won't change (except when the clone is | |
4341 | * flattened, already handled that). So we only need to | |
4342 | * record the parent spec we have not already done so. | |
4343 | */ | |
4344 | if (!rbd_dev->parent_spec) { | |
4345 | parent_spec->pool_id = pool_id; | |
4346 | parent_spec->image_id = image_id; | |
4347 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4348 | rbd_dev->parent_spec = parent_spec; |
4349 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4350 | } else { |
4351 | kfree(image_id); | |
3b5cf2a2 AE |
4352 | } |
4353 | ||
4354 | /* | |
cf32bd9c ID |
4355 | * We always update the parent overlap. If it's zero we issue |
4356 | * a warning, as we will proceed as if there was no parent. | |
3b5cf2a2 | 4357 | */ |
3b5cf2a2 | 4358 | if (!overlap) { |
3b5cf2a2 | 4359 | if (parent_spec) { |
cf32bd9c ID |
4360 | /* refresh, careful to warn just once */ |
4361 | if (rbd_dev->parent_overlap) | |
4362 | rbd_warn(rbd_dev, | |
4363 | "clone now standalone (overlap became 0)"); | |
3b5cf2a2 | 4364 | } else { |
cf32bd9c ID |
4365 | /* initial probe */ |
4366 | rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); | |
3b5cf2a2 | 4367 | } |
70cf49cf | 4368 | } |
cf32bd9c ID |
4369 | rbd_dev->parent_overlap = overlap; |
4370 | ||
86b00e0d AE |
4371 | out: |
4372 | ret = 0; | |
4373 | out_err: | |
4374 | kfree(reply_buf); | |
4375 | rbd_spec_put(parent_spec); | |
4376 | ||
4377 | return ret; | |
4378 | } | |
4379 | ||
cc070d59 AE |
4380 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4381 | { | |
4382 | struct { | |
4383 | __le64 stripe_unit; | |
4384 | __le64 stripe_count; | |
4385 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4386 | size_t size = sizeof (striping_info_buf); | |
4387 | void *p; | |
4388 | u64 obj_size; | |
4389 | u64 stripe_unit; | |
4390 | u64 stripe_count; | |
4391 | int ret; | |
4392 | ||
c41d13a3 | 4393 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
cc070d59 | 4394 | "rbd", "get_stripe_unit_count", NULL, 0, |
e2a58ee5 | 4395 | (char *)&striping_info_buf, size); |
cc070d59 AE |
4396 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4397 | if (ret < 0) | |
4398 | return ret; | |
4399 | if (ret < size) | |
4400 | return -ERANGE; | |
4401 | ||
4402 | /* | |
4403 | * We don't actually support the "fancy striping" feature | |
4404 | * (STRIPINGV2) yet, but if the striping sizes are the | |
4405 | * defaults the behavior is the same as before. So find | |
4406 | * out, and only fail if the image has non-default values. | |
4407 | */ | |
4408 | ret = -EINVAL; | |
4409 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
4410 | p = &striping_info_buf; | |
4411 | stripe_unit = ceph_decode_64(&p); | |
4412 | if (stripe_unit != obj_size) { | |
4413 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
4414 | "(got %llu want %llu)", | |
4415 | stripe_unit, obj_size); | |
4416 | return -EINVAL; | |
4417 | } | |
4418 | stripe_count = ceph_decode_64(&p); | |
4419 | if (stripe_count != 1) { | |
4420 | rbd_warn(rbd_dev, "unsupported stripe count " | |
4421 | "(got %llu want 1)", stripe_count); | |
4422 | return -EINVAL; | |
4423 | } | |
500d0c0f AE |
4424 | rbd_dev->header.stripe_unit = stripe_unit; |
4425 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
4426 | |
4427 | return 0; | |
4428 | } | |
4429 | ||
9e15b77d AE |
4430 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4431 | { | |
4432 | size_t image_id_size; | |
4433 | char *image_id; | |
4434 | void *p; | |
4435 | void *end; | |
4436 | size_t size; | |
4437 | void *reply_buf = NULL; | |
4438 | size_t len = 0; | |
4439 | char *image_name = NULL; | |
4440 | int ret; | |
4441 | ||
4442 | rbd_assert(!rbd_dev->spec->image_name); | |
4443 | ||
69e7a02f AE |
4444 | len = strlen(rbd_dev->spec->image_id); |
4445 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4446 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4447 | if (!image_id) | |
4448 | return NULL; | |
4449 | ||
4450 | p = image_id; | |
4157976b | 4451 | end = image_id + image_id_size; |
57385b51 | 4452 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4453 | |
4454 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4455 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4456 | if (!reply_buf) | |
4457 | goto out; | |
4458 | ||
36be9a76 | 4459 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
4460 | "rbd", "dir_get_name", |
4461 | image_id, image_id_size, | |
e2a58ee5 | 4462 | reply_buf, size); |
9e15b77d AE |
4463 | if (ret < 0) |
4464 | goto out; | |
4465 | p = reply_buf; | |
f40eb349 AE |
4466 | end = reply_buf + ret; |
4467 | ||
9e15b77d AE |
4468 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4469 | if (IS_ERR(image_name)) | |
4470 | image_name = NULL; | |
4471 | else | |
4472 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4473 | out: | |
4474 | kfree(reply_buf); | |
4475 | kfree(image_id); | |
4476 | ||
4477 | return image_name; | |
4478 | } | |
4479 | ||
2ad3d716 AE |
4480 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4481 | { | |
4482 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4483 | const char *snap_name; | |
4484 | u32 which = 0; | |
4485 | ||
4486 | /* Skip over names until we find the one we are looking for */ | |
4487 | ||
4488 | snap_name = rbd_dev->header.snap_names; | |
4489 | while (which < snapc->num_snaps) { | |
4490 | if (!strcmp(name, snap_name)) | |
4491 | return snapc->snaps[which]; | |
4492 | snap_name += strlen(snap_name) + 1; | |
4493 | which++; | |
4494 | } | |
4495 | return CEPH_NOSNAP; | |
4496 | } | |
4497 | ||
4498 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4499 | { | |
4500 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4501 | u32 which; | |
4502 | bool found = false; | |
4503 | u64 snap_id; | |
4504 | ||
4505 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4506 | const char *snap_name; | |
4507 | ||
4508 | snap_id = snapc->snaps[which]; | |
4509 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4510 | if (IS_ERR(snap_name)) { |
4511 | /* ignore no-longer existing snapshots */ | |
4512 | if (PTR_ERR(snap_name) == -ENOENT) | |
4513 | continue; | |
4514 | else | |
4515 | break; | |
4516 | } | |
2ad3d716 AE |
4517 | found = !strcmp(name, snap_name); |
4518 | kfree(snap_name); | |
4519 | } | |
4520 | return found ? snap_id : CEPH_NOSNAP; | |
4521 | } | |
4522 | ||
4523 | /* | |
4524 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4525 | * no snapshot by that name is found, or if an error occurs. | |
4526 | */ | |
4527 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4528 | { | |
4529 | if (rbd_dev->image_format == 1) | |
4530 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4531 | ||
4532 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4533 | } | |
4534 | ||
9e15b77d | 4535 | /* |
04077599 ID |
4536 | * An image being mapped will have everything but the snap id. |
4537 | */ | |
4538 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4539 | { | |
4540 | struct rbd_spec *spec = rbd_dev->spec; | |
4541 | ||
4542 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4543 | rbd_assert(spec->image_id && spec->image_name); | |
4544 | rbd_assert(spec->snap_name); | |
4545 | ||
4546 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4547 | u64 snap_id; | |
4548 | ||
4549 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4550 | if (snap_id == CEPH_NOSNAP) | |
4551 | return -ENOENT; | |
4552 | ||
4553 | spec->snap_id = snap_id; | |
4554 | } else { | |
4555 | spec->snap_id = CEPH_NOSNAP; | |
4556 | } | |
4557 | ||
4558 | return 0; | |
4559 | } | |
4560 | ||
4561 | /* | |
4562 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4563 | * |
04077599 ID |
4564 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4565 | * can't figure out the name for an image id. | |
9e15b77d | 4566 | */ |
04077599 | 4567 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4568 | { |
2e9f7f1c AE |
4569 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4570 | struct rbd_spec *spec = rbd_dev->spec; | |
4571 | const char *pool_name; | |
4572 | const char *image_name; | |
4573 | const char *snap_name; | |
9e15b77d AE |
4574 | int ret; |
4575 | ||
04077599 ID |
4576 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4577 | rbd_assert(spec->image_id); | |
4578 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4579 | |
2e9f7f1c | 4580 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4581 | |
2e9f7f1c AE |
4582 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4583 | if (!pool_name) { | |
4584 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4585 | return -EIO; |
4586 | } | |
2e9f7f1c AE |
4587 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4588 | if (!pool_name) | |
9e15b77d AE |
4589 | return -ENOMEM; |
4590 | ||
4591 | /* Fetch the image name; tolerate failure here */ | |
4592 | ||
2e9f7f1c AE |
4593 | image_name = rbd_dev_image_name(rbd_dev); |
4594 | if (!image_name) | |
06ecc6cb | 4595 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4596 | |
04077599 | 4597 | /* Fetch the snapshot name */ |
9e15b77d | 4598 | |
2e9f7f1c | 4599 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4600 | if (IS_ERR(snap_name)) { |
4601 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4602 | goto out_err; |
2e9f7f1c AE |
4603 | } |
4604 | ||
4605 | spec->pool_name = pool_name; | |
4606 | spec->image_name = image_name; | |
4607 | spec->snap_name = snap_name; | |
9e15b77d AE |
4608 | |
4609 | return 0; | |
04077599 | 4610 | |
9e15b77d | 4611 | out_err: |
2e9f7f1c AE |
4612 | kfree(image_name); |
4613 | kfree(pool_name); | |
9e15b77d AE |
4614 | return ret; |
4615 | } | |
4616 | ||
cc4a38bd | 4617 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4618 | { |
4619 | size_t size; | |
4620 | int ret; | |
4621 | void *reply_buf; | |
4622 | void *p; | |
4623 | void *end; | |
4624 | u64 seq; | |
4625 | u32 snap_count; | |
4626 | struct ceph_snap_context *snapc; | |
4627 | u32 i; | |
4628 | ||
4629 | /* | |
4630 | * We'll need room for the seq value (maximum snapshot id), | |
4631 | * snapshot count, and array of that many snapshot ids. | |
4632 | * For now we have a fixed upper limit on the number we're | |
4633 | * prepared to receive. | |
4634 | */ | |
4635 | size = sizeof (__le64) + sizeof (__le32) + | |
4636 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4637 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4638 | if (!reply_buf) | |
4639 | return -ENOMEM; | |
4640 | ||
c41d13a3 | 4641 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
4157976b | 4642 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 4643 | reply_buf, size); |
36be9a76 | 4644 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4645 | if (ret < 0) |
4646 | goto out; | |
4647 | ||
35d489f9 | 4648 | p = reply_buf; |
57385b51 AE |
4649 | end = reply_buf + ret; |
4650 | ret = -ERANGE; | |
35d489f9 AE |
4651 | ceph_decode_64_safe(&p, end, seq, out); |
4652 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4653 | ||
4654 | /* | |
4655 | * Make sure the reported number of snapshot ids wouldn't go | |
4656 | * beyond the end of our buffer. But before checking that, | |
4657 | * make sure the computed size of the snapshot context we | |
4658 | * allocate is representable in a size_t. | |
4659 | */ | |
4660 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4661 | / sizeof (u64)) { | |
4662 | ret = -EINVAL; | |
4663 | goto out; | |
4664 | } | |
4665 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4666 | goto out; | |
468521c1 | 4667 | ret = 0; |
35d489f9 | 4668 | |
812164f8 | 4669 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4670 | if (!snapc) { |
4671 | ret = -ENOMEM; | |
4672 | goto out; | |
4673 | } | |
35d489f9 | 4674 | snapc->seq = seq; |
35d489f9 AE |
4675 | for (i = 0; i < snap_count; i++) |
4676 | snapc->snaps[i] = ceph_decode_64(&p); | |
4677 | ||
49ece554 | 4678 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4679 | rbd_dev->header.snapc = snapc; |
4680 | ||
4681 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4682 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4683 | out: |
4684 | kfree(reply_buf); | |
4685 | ||
57385b51 | 4686 | return ret; |
35d489f9 AE |
4687 | } |
4688 | ||
54cac61f AE |
4689 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4690 | u64 snap_id) | |
b8b1e2db AE |
4691 | { |
4692 | size_t size; | |
4693 | void *reply_buf; | |
54cac61f | 4694 | __le64 snapid; |
b8b1e2db AE |
4695 | int ret; |
4696 | void *p; | |
4697 | void *end; | |
b8b1e2db AE |
4698 | char *snap_name; |
4699 | ||
4700 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4701 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4702 | if (!reply_buf) | |
4703 | return ERR_PTR(-ENOMEM); | |
4704 | ||
54cac61f | 4705 | snapid = cpu_to_le64(snap_id); |
c41d13a3 | 4706 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_oid.name, |
b8b1e2db | 4707 | "rbd", "get_snapshot_name", |
54cac61f | 4708 | &snapid, sizeof (snapid), |
e2a58ee5 | 4709 | reply_buf, size); |
36be9a76 | 4710 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4711 | if (ret < 0) { |
4712 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4713 | goto out; |
f40eb349 | 4714 | } |
b8b1e2db AE |
4715 | |
4716 | p = reply_buf; | |
f40eb349 | 4717 | end = reply_buf + ret; |
e5c35534 | 4718 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4719 | if (IS_ERR(snap_name)) |
b8b1e2db | 4720 | goto out; |
b8b1e2db | 4721 | |
f40eb349 | 4722 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4723 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4724 | out: |
4725 | kfree(reply_buf); | |
4726 | ||
f40eb349 | 4727 | return snap_name; |
b8b1e2db AE |
4728 | } |
4729 | ||
2df3fac7 | 4730 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4731 | { |
2df3fac7 | 4732 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4733 | int ret; |
117973fb | 4734 | |
1617e40c JD |
4735 | ret = rbd_dev_v2_image_size(rbd_dev); |
4736 | if (ret) | |
cfbf6377 | 4737 | return ret; |
1617e40c | 4738 | |
2df3fac7 AE |
4739 | if (first_time) { |
4740 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
4741 | if (ret) | |
cfbf6377 | 4742 | return ret; |
2df3fac7 AE |
4743 | } |
4744 | ||
cc4a38bd | 4745 | ret = rbd_dev_v2_snap_context(rbd_dev); |
d194cd1d ID |
4746 | if (ret && first_time) { |
4747 | kfree(rbd_dev->header.object_prefix); | |
4748 | rbd_dev->header.object_prefix = NULL; | |
4749 | } | |
117973fb AE |
4750 | |
4751 | return ret; | |
4752 | } | |
4753 | ||
a720ae09 ID |
4754 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
4755 | { | |
4756 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4757 | ||
4758 | if (rbd_dev->image_format == 1) | |
4759 | return rbd_dev_v1_header_info(rbd_dev); | |
4760 | ||
4761 | return rbd_dev_v2_header_info(rbd_dev); | |
4762 | } | |
4763 | ||
e28fff26 AE |
4764 | /* |
4765 | * Skips over white space at *buf, and updates *buf to point to the | |
4766 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4767 | * the token (string of non-white space characters) found. Note |
4768 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4769 | */ |
4770 | static inline size_t next_token(const char **buf) | |
4771 | { | |
4772 | /* | |
4773 | * These are the characters that produce nonzero for | |
4774 | * isspace() in the "C" and "POSIX" locales. | |
4775 | */ | |
4776 | const char *spaces = " \f\n\r\t\v"; | |
4777 | ||
4778 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4779 | ||
4780 | return strcspn(*buf, spaces); /* Return token length */ | |
4781 | } | |
4782 | ||
ea3352f4 AE |
4783 | /* |
4784 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4785 | * enough to hold a copy of it, and copies the token into the new | |
4786 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4787 | * that a duplicate buffer is created even for a zero-length token. | |
4788 | * | |
4789 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4790 | * pointer if memory for the duplicate was not available. If | |
4791 | * the lenp argument is a non-null pointer, the length of the token | |
4792 | * (not including the '\0') is returned in *lenp. | |
4793 | * | |
4794 | * If successful, the *buf pointer will be updated to point beyond | |
4795 | * the end of the found token. | |
4796 | * | |
4797 | * Note: uses GFP_KERNEL for allocation. | |
4798 | */ | |
4799 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4800 | { | |
4801 | char *dup; | |
4802 | size_t len; | |
4803 | ||
4804 | len = next_token(buf); | |
4caf35f9 | 4805 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4806 | if (!dup) |
4807 | return NULL; | |
ea3352f4 AE |
4808 | *(dup + len) = '\0'; |
4809 | *buf += len; | |
4810 | ||
4811 | if (lenp) | |
4812 | *lenp = len; | |
4813 | ||
4814 | return dup; | |
4815 | } | |
4816 | ||
a725f65e | 4817 | /* |
859c31df AE |
4818 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4819 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4820 | * and the data written is passed here via a NUL-terminated buffer. | |
4821 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4822 | * |
859c31df AE |
4823 | * The information extracted from these options is recorded in |
4824 | * the other parameters which return dynamically-allocated | |
4825 | * structures: | |
4826 | * ceph_opts | |
4827 | * The address of a pointer that will refer to a ceph options | |
4828 | * structure. Caller must release the returned pointer using | |
4829 | * ceph_destroy_options() when it is no longer needed. | |
4830 | * rbd_opts | |
4831 | * Address of an rbd options pointer. Fully initialized by | |
4832 | * this function; caller must release with kfree(). | |
4833 | * spec | |
4834 | * Address of an rbd image specification pointer. Fully | |
4835 | * initialized by this function based on parsed options. | |
4836 | * Caller must release with rbd_spec_put(). | |
4837 | * | |
4838 | * The options passed take this form: | |
4839 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4840 | * where: | |
4841 | * <mon_addrs> | |
4842 | * A comma-separated list of one or more monitor addresses. | |
4843 | * A monitor address is an ip address, optionally followed | |
4844 | * by a port number (separated by a colon). | |
4845 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4846 | * <options> | |
4847 | * A comma-separated list of ceph and/or rbd options. | |
4848 | * <pool_name> | |
4849 | * The name of the rados pool containing the rbd image. | |
4850 | * <image_name> | |
4851 | * The name of the image in that pool to map. | |
4852 | * <snap_id> | |
4853 | * An optional snapshot id. If provided, the mapping will | |
4854 | * present data from the image at the time that snapshot was | |
4855 | * created. The image head is used if no snapshot id is | |
4856 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4857 | */ |
859c31df | 4858 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4859 | struct ceph_options **ceph_opts, |
859c31df AE |
4860 | struct rbd_options **opts, |
4861 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4862 | { |
d22f76e7 | 4863 | size_t len; |
859c31df | 4864 | char *options; |
0ddebc0c | 4865 | const char *mon_addrs; |
ecb4dc22 | 4866 | char *snap_name; |
0ddebc0c | 4867 | size_t mon_addrs_size; |
859c31df | 4868 | struct rbd_spec *spec = NULL; |
4e9afeba | 4869 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4870 | struct ceph_options *copts; |
dc79b113 | 4871 | int ret; |
e28fff26 AE |
4872 | |
4873 | /* The first four tokens are required */ | |
4874 | ||
7ef3214a | 4875 | len = next_token(&buf); |
4fb5d671 AE |
4876 | if (!len) { |
4877 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4878 | return -EINVAL; | |
4879 | } | |
0ddebc0c | 4880 | mon_addrs = buf; |
f28e565a | 4881 | mon_addrs_size = len + 1; |
7ef3214a | 4882 | buf += len; |
a725f65e | 4883 | |
dc79b113 | 4884 | ret = -EINVAL; |
f28e565a AE |
4885 | options = dup_token(&buf, NULL); |
4886 | if (!options) | |
dc79b113 | 4887 | return -ENOMEM; |
4fb5d671 AE |
4888 | if (!*options) { |
4889 | rbd_warn(NULL, "no options provided"); | |
4890 | goto out_err; | |
4891 | } | |
e28fff26 | 4892 | |
859c31df AE |
4893 | spec = rbd_spec_alloc(); |
4894 | if (!spec) | |
f28e565a | 4895 | goto out_mem; |
859c31df AE |
4896 | |
4897 | spec->pool_name = dup_token(&buf, NULL); | |
4898 | if (!spec->pool_name) | |
4899 | goto out_mem; | |
4fb5d671 AE |
4900 | if (!*spec->pool_name) { |
4901 | rbd_warn(NULL, "no pool name provided"); | |
4902 | goto out_err; | |
4903 | } | |
e28fff26 | 4904 | |
69e7a02f | 4905 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4906 | if (!spec->image_name) |
f28e565a | 4907 | goto out_mem; |
4fb5d671 AE |
4908 | if (!*spec->image_name) { |
4909 | rbd_warn(NULL, "no image name provided"); | |
4910 | goto out_err; | |
4911 | } | |
d4b125e9 | 4912 | |
f28e565a AE |
4913 | /* |
4914 | * Snapshot name is optional; default is to use "-" | |
4915 | * (indicating the head/no snapshot). | |
4916 | */ | |
3feeb894 | 4917 | len = next_token(&buf); |
820a5f3e | 4918 | if (!len) { |
3feeb894 AE |
4919 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4920 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4921 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4922 | ret = -ENAMETOOLONG; |
f28e565a | 4923 | goto out_err; |
849b4260 | 4924 | } |
ecb4dc22 AE |
4925 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4926 | if (!snap_name) | |
f28e565a | 4927 | goto out_mem; |
ecb4dc22 AE |
4928 | *(snap_name + len) = '\0'; |
4929 | spec->snap_name = snap_name; | |
e5c35534 | 4930 | |
0ddebc0c | 4931 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4932 | |
4e9afeba AE |
4933 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4934 | if (!rbd_opts) | |
4935 | goto out_mem; | |
4936 | ||
4937 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
b5584180 | 4938 | rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
d22f76e7 | 4939 | |
859c31df | 4940 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4941 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4942 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4943 | if (IS_ERR(copts)) { |
4944 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4945 | goto out_err; |
4946 | } | |
859c31df AE |
4947 | kfree(options); |
4948 | ||
4949 | *ceph_opts = copts; | |
4e9afeba | 4950 | *opts = rbd_opts; |
859c31df | 4951 | *rbd_spec = spec; |
0ddebc0c | 4952 | |
dc79b113 | 4953 | return 0; |
f28e565a | 4954 | out_mem: |
dc79b113 | 4955 | ret = -ENOMEM; |
d22f76e7 | 4956 | out_err: |
859c31df AE |
4957 | kfree(rbd_opts); |
4958 | rbd_spec_put(spec); | |
f28e565a | 4959 | kfree(options); |
d22f76e7 | 4960 | |
dc79b113 | 4961 | return ret; |
a725f65e AE |
4962 | } |
4963 | ||
30ba1f02 ID |
4964 | /* |
4965 | * Return pool id (>= 0) or a negative error code. | |
4966 | */ | |
4967 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
4968 | { | |
a319bf56 | 4969 | struct ceph_options *opts = rbdc->client->options; |
30ba1f02 | 4970 | u64 newest_epoch; |
30ba1f02 ID |
4971 | int tries = 0; |
4972 | int ret; | |
4973 | ||
4974 | again: | |
4975 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
4976 | if (ret == -ENOENT && tries++ < 1) { | |
d0b19705 ID |
4977 | ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
4978 | &newest_epoch); | |
30ba1f02 ID |
4979 | if (ret < 0) |
4980 | return ret; | |
4981 | ||
4982 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
7cca78c9 | 4983 | ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
30ba1f02 | 4984 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
a319bf56 ID |
4985 | newest_epoch, |
4986 | opts->mount_timeout); | |
30ba1f02 ID |
4987 | goto again; |
4988 | } else { | |
4989 | /* the osdmap we have is new enough */ | |
4990 | return -ENOENT; | |
4991 | } | |
4992 | } | |
4993 | ||
4994 | return ret; | |
4995 | } | |
4996 | ||
589d30e0 AE |
4997 | /* |
4998 | * An rbd format 2 image has a unique identifier, distinct from the | |
4999 | * name given to it by the user. Internally, that identifier is | |
5000 | * what's used to specify the names of objects related to the image. | |
5001 | * | |
5002 | * A special "rbd id" object is used to map an rbd image name to its | |
5003 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5004 | * with the supplied name. | |
5005 | * | |
5006 | * This function will record the given rbd_dev's image_id field if | |
5007 | * it can be determined, and in that case will return 0. If any | |
5008 | * errors occur a negative errno will be returned and the rbd_dev's | |
5009 | * image_id field will be unchanged (and should be NULL). | |
5010 | */ | |
5011 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5012 | { | |
5013 | int ret; | |
5014 | size_t size; | |
5015 | char *object_name; | |
5016 | void *response; | |
c0fba368 | 5017 | char *image_id; |
2f82ee54 | 5018 | |
2c0d0a10 AE |
5019 | /* |
5020 | * When probing a parent image, the image id is already | |
5021 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5022 | * need to fetch the image id again in this case. We |
5023 | * do still need to set the image format though. | |
2c0d0a10 | 5024 | */ |
c0fba368 AE |
5025 | if (rbd_dev->spec->image_id) { |
5026 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5027 | ||
2c0d0a10 | 5028 | return 0; |
c0fba368 | 5029 | } |
2c0d0a10 | 5030 | |
589d30e0 AE |
5031 | /* |
5032 | * First, see if the format 2 image id file exists, and if | |
5033 | * so, get the image's persistent id from it. | |
5034 | */ | |
69e7a02f | 5035 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
5036 | object_name = kmalloc(size, GFP_NOIO); |
5037 | if (!object_name) | |
5038 | return -ENOMEM; | |
0d7dbfce | 5039 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
5040 | dout("rbd id object name is %s\n", object_name); |
5041 | ||
5042 | /* Response will be an encoded string, which includes a length */ | |
5043 | ||
5044 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5045 | response = kzalloc(size, GFP_NOIO); | |
5046 | if (!response) { | |
5047 | ret = -ENOMEM; | |
5048 | goto out; | |
5049 | } | |
5050 | ||
c0fba368 AE |
5051 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5052 | ||
36be9a76 | 5053 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 5054 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 5055 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 5056 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5057 | if (ret == -ENOENT) { |
5058 | image_id = kstrdup("", GFP_KERNEL); | |
5059 | ret = image_id ? 0 : -ENOMEM; | |
5060 | if (!ret) | |
5061 | rbd_dev->image_format = 1; | |
7dd440c9 | 5062 | } else if (ret >= 0) { |
c0fba368 AE |
5063 | void *p = response; |
5064 | ||
5065 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5066 | NULL, GFP_NOIO); |
461f758a | 5067 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5068 | if (!ret) |
5069 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5070 | } |
5071 | ||
5072 | if (!ret) { | |
5073 | rbd_dev->spec->image_id = image_id; | |
5074 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5075 | } |
5076 | out: | |
5077 | kfree(response); | |
5078 | kfree(object_name); | |
5079 | ||
5080 | return ret; | |
5081 | } | |
5082 | ||
3abef3b3 AE |
5083 | /* |
5084 | * Undo whatever state changes are made by v1 or v2 header info | |
5085 | * call. | |
5086 | */ | |
6fd48b3b AE |
5087 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5088 | { | |
5089 | struct rbd_image_header *header; | |
5090 | ||
e69b8d41 | 5091 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5092 | |
5093 | /* Free dynamic fields from the header, then zero it out */ | |
5094 | ||
5095 | header = &rbd_dev->header; | |
812164f8 | 5096 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5097 | kfree(header->snap_sizes); |
5098 | kfree(header->snap_names); | |
5099 | kfree(header->object_prefix); | |
5100 | memset(header, 0, sizeof (*header)); | |
5101 | } | |
5102 | ||
2df3fac7 | 5103 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5104 | { |
5105 | int ret; | |
a30b71b9 | 5106 | |
1e130199 | 5107 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5108 | if (ret) |
b1b5402a AE |
5109 | goto out_err; |
5110 | ||
2df3fac7 AE |
5111 | /* |
5112 | * Get the and check features for the image. Currently the | |
5113 | * features are assumed to never change. | |
5114 | */ | |
b1b5402a | 5115 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5116 | if (ret) |
9d475de5 | 5117 | goto out_err; |
35d489f9 | 5118 | |
cc070d59 AE |
5119 | /* If the image supports fancy striping, get its parameters */ |
5120 | ||
5121 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5122 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5123 | if (ret < 0) | |
5124 | goto out_err; | |
5125 | } | |
2df3fac7 | 5126 | /* No support for crypto and compression type format 2 images */ |
a30b71b9 | 5127 | |
35152979 | 5128 | return 0; |
9d475de5 | 5129 | out_err: |
642a2537 | 5130 | rbd_dev->header.features = 0; |
1e130199 AE |
5131 | kfree(rbd_dev->header.object_prefix); |
5132 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
5133 | |
5134 | return ret; | |
a30b71b9 AE |
5135 | } |
5136 | ||
6d69bb53 ID |
5137 | /* |
5138 | * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> | |
5139 | * rbd_dev_image_probe() recursion depth, which means it's also the | |
5140 | * length of the already discovered part of the parent chain. | |
5141 | */ | |
5142 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) | |
83a06263 | 5143 | { |
2f82ee54 | 5144 | struct rbd_device *parent = NULL; |
124afba2 AE |
5145 | int ret; |
5146 | ||
5147 | if (!rbd_dev->parent_spec) | |
5148 | return 0; | |
124afba2 | 5149 | |
6d69bb53 ID |
5150 | if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
5151 | pr_info("parent chain is too long (%d)\n", depth); | |
5152 | ret = -EINVAL; | |
5153 | goto out_err; | |
5154 | } | |
5155 | ||
1643dfa4 | 5156 | parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
1f2c6651 ID |
5157 | if (!parent) { |
5158 | ret = -ENOMEM; | |
124afba2 | 5159 | goto out_err; |
1f2c6651 ID |
5160 | } |
5161 | ||
5162 | /* | |
5163 | * Images related by parent/child relationships always share | |
5164 | * rbd_client and spec/parent_spec, so bump their refcounts. | |
5165 | */ | |
5166 | __rbd_get_client(rbd_dev->rbd_client); | |
5167 | rbd_spec_get(rbd_dev->parent_spec); | |
124afba2 | 5168 | |
6d69bb53 | 5169 | ret = rbd_dev_image_probe(parent, depth); |
124afba2 AE |
5170 | if (ret < 0) |
5171 | goto out_err; | |
1f2c6651 | 5172 | |
124afba2 | 5173 | rbd_dev->parent = parent; |
a2acd00e | 5174 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 | 5175 | return 0; |
1f2c6651 | 5176 | |
124afba2 | 5177 | out_err: |
1f2c6651 | 5178 | rbd_dev_unparent(rbd_dev); |
1761b229 | 5179 | rbd_dev_destroy(parent); |
124afba2 AE |
5180 | return ret; |
5181 | } | |
5182 | ||
811c6688 ID |
5183 | /* |
5184 | * rbd_dev->header_rwsem must be locked for write and will be unlocked | |
5185 | * upon return. | |
5186 | */ | |
200a6a8b | 5187 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5188 | { |
83a06263 | 5189 | int ret; |
d1cf5788 | 5190 | |
9b60e70b | 5191 | /* Record our major and minor device numbers. */ |
83a06263 | 5192 | |
9b60e70b ID |
5193 | if (!single_major) { |
5194 | ret = register_blkdev(0, rbd_dev->name); | |
5195 | if (ret < 0) | |
1643dfa4 | 5196 | goto err_out_unlock; |
9b60e70b ID |
5197 | |
5198 | rbd_dev->major = ret; | |
5199 | rbd_dev->minor = 0; | |
5200 | } else { | |
5201 | rbd_dev->major = rbd_major; | |
5202 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5203 | } | |
83a06263 AE |
5204 | |
5205 | /* Set up the blkdev mapping. */ | |
5206 | ||
5207 | ret = rbd_init_disk(rbd_dev); | |
5208 | if (ret) | |
5209 | goto err_out_blkdev; | |
5210 | ||
f35a4dee | 5211 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5212 | if (ret) |
5213 | goto err_out_disk; | |
bc1ecc65 | 5214 | |
f35a4dee | 5215 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
22001f61 | 5216 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
f35a4dee | 5217 | |
dd5ac32d ID |
5218 | dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
5219 | ret = device_add(&rbd_dev->dev); | |
f35a4dee | 5220 | if (ret) |
f5ee37bd | 5221 | goto err_out_mapping; |
83a06263 | 5222 | |
83a06263 AE |
5223 | /* Everything's ready. Announce the disk to the world. */ |
5224 | ||
129b79d4 | 5225 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
811c6688 | 5226 | up_write(&rbd_dev->header_rwsem); |
83a06263 | 5227 | |
1643dfa4 ID |
5228 | spin_lock(&rbd_dev_list_lock); |
5229 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
5230 | spin_unlock(&rbd_dev_list_lock); | |
5231 | ||
811c6688 | 5232 | add_disk(rbd_dev->disk); |
83a06263 AE |
5233 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
5234 | (unsigned long long) rbd_dev->mapping.size); | |
5235 | ||
5236 | return ret; | |
2f82ee54 | 5237 | |
f35a4dee AE |
5238 | err_out_mapping: |
5239 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5240 | err_out_disk: |
5241 | rbd_free_disk(rbd_dev); | |
5242 | err_out_blkdev: | |
9b60e70b ID |
5243 | if (!single_major) |
5244 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
811c6688 ID |
5245 | err_out_unlock: |
5246 | up_write(&rbd_dev->header_rwsem); | |
83a06263 AE |
5247 | return ret; |
5248 | } | |
5249 | ||
332bb12d AE |
5250 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5251 | { | |
5252 | struct rbd_spec *spec = rbd_dev->spec; | |
c41d13a3 | 5253 | int ret; |
332bb12d AE |
5254 | |
5255 | /* Record the header object name for this rbd image. */ | |
5256 | ||
5257 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5258 | ||
7627151e | 5259 | rbd_dev->header_oloc.pool = rbd_dev->layout.pool_id; |
332bb12d | 5260 | if (rbd_dev->image_format == 1) |
c41d13a3 ID |
5261 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5262 | spec->image_name, RBD_SUFFIX); | |
332bb12d | 5263 | else |
c41d13a3 ID |
5264 | ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
5265 | RBD_HEADER_PREFIX, spec->image_id); | |
332bb12d | 5266 | |
c41d13a3 | 5267 | return ret; |
332bb12d AE |
5268 | } |
5269 | ||
200a6a8b AE |
5270 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5271 | { | |
6fd48b3b | 5272 | rbd_dev_unprobe(rbd_dev); |
6fd48b3b AE |
5273 | rbd_dev->image_format = 0; |
5274 | kfree(rbd_dev->spec->image_id); | |
5275 | rbd_dev->spec->image_id = NULL; | |
5276 | ||
200a6a8b AE |
5277 | rbd_dev_destroy(rbd_dev); |
5278 | } | |
5279 | ||
a30b71b9 AE |
5280 | /* |
5281 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5282 | * device. If this image is the one being mapped (i.e., not a |
5283 | * parent), initiate a watch on its header object before using that | |
5284 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5285 | */ |
6d69bb53 | 5286 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
a30b71b9 AE |
5287 | { |
5288 | int ret; | |
5289 | ||
5290 | /* | |
3abef3b3 AE |
5291 | * Get the id from the image id object. Unless there's an |
5292 | * error, rbd_dev->spec->image_id will be filled in with | |
5293 | * a dynamically-allocated string, and rbd_dev->image_format | |
5294 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5295 | */ |
5296 | ret = rbd_dev_image_id(rbd_dev); | |
5297 | if (ret) | |
c0fba368 | 5298 | return ret; |
c0fba368 | 5299 | |
332bb12d AE |
5300 | ret = rbd_dev_header_name(rbd_dev); |
5301 | if (ret) | |
5302 | goto err_out_format; | |
5303 | ||
6d69bb53 | 5304 | if (!depth) { |
99d16943 | 5305 | ret = rbd_register_watch(rbd_dev); |
1fe48023 ID |
5306 | if (ret) { |
5307 | if (ret == -ENOENT) | |
5308 | pr_info("image %s/%s does not exist\n", | |
5309 | rbd_dev->spec->pool_name, | |
5310 | rbd_dev->spec->image_name); | |
c41d13a3 | 5311 | goto err_out_format; |
1fe48023 | 5312 | } |
1f3ef788 | 5313 | } |
b644de2b | 5314 | |
a720ae09 | 5315 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5316 | if (ret) |
b644de2b | 5317 | goto err_out_watch; |
83a06263 | 5318 | |
04077599 ID |
5319 | /* |
5320 | * If this image is the one being mapped, we have pool name and | |
5321 | * id, image name and id, and snap name - need to fill snap id. | |
5322 | * Otherwise this is a parent image, identified by pool, image | |
5323 | * and snap ids - need to fill in names for those ids. | |
5324 | */ | |
6d69bb53 | 5325 | if (!depth) |
04077599 ID |
5326 | ret = rbd_spec_fill_snap_id(rbd_dev); |
5327 | else | |
5328 | ret = rbd_spec_fill_names(rbd_dev); | |
1fe48023 ID |
5329 | if (ret) { |
5330 | if (ret == -ENOENT) | |
5331 | pr_info("snap %s/%s@%s does not exist\n", | |
5332 | rbd_dev->spec->pool_name, | |
5333 | rbd_dev->spec->image_name, | |
5334 | rbd_dev->spec->snap_name); | |
33dca39f | 5335 | goto err_out_probe; |
1fe48023 | 5336 | } |
9bb81c9b | 5337 | |
e8f59b59 ID |
5338 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5339 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5340 | if (ret) | |
5341 | goto err_out_probe; | |
5342 | ||
5343 | /* | |
5344 | * Need to warn users if this image is the one being | |
5345 | * mapped and has a parent. | |
5346 | */ | |
6d69bb53 | 5347 | if (!depth && rbd_dev->parent_spec) |
e8f59b59 ID |
5348 | rbd_warn(rbd_dev, |
5349 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5350 | } | |
5351 | ||
6d69bb53 | 5352 | ret = rbd_dev_probe_parent(rbd_dev, depth); |
30d60ba2 AE |
5353 | if (ret) |
5354 | goto err_out_probe; | |
5355 | ||
5356 | dout("discovered format %u image, header name is %s\n", | |
c41d13a3 | 5357 | rbd_dev->image_format, rbd_dev->header_oid.name); |
30d60ba2 | 5358 | return 0; |
e8f59b59 | 5359 | |
6fd48b3b AE |
5360 | err_out_probe: |
5361 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5362 | err_out_watch: |
6d69bb53 | 5363 | if (!depth) |
99d16943 | 5364 | rbd_unregister_watch(rbd_dev); |
332bb12d AE |
5365 | err_out_format: |
5366 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5367 | kfree(rbd_dev->spec->image_id); |
5368 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5369 | return ret; |
5370 | } | |
5371 | ||
9b60e70b ID |
5372 | static ssize_t do_rbd_add(struct bus_type *bus, |
5373 | const char *buf, | |
5374 | size_t count) | |
602adf40 | 5375 | { |
cb8627c7 | 5376 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5377 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5378 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5379 | struct rbd_spec *spec = NULL; |
9d3997fd | 5380 | struct rbd_client *rbdc; |
51344a38 | 5381 | bool read_only; |
b51c83c2 | 5382 | int rc; |
602adf40 YS |
5383 | |
5384 | if (!try_module_get(THIS_MODULE)) | |
5385 | return -ENODEV; | |
5386 | ||
602adf40 | 5387 | /* parse add command */ |
859c31df | 5388 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5389 | if (rc < 0) |
dd5ac32d | 5390 | goto out; |
78cea76e | 5391 | |
9d3997fd AE |
5392 | rbdc = rbd_get_client(ceph_opts); |
5393 | if (IS_ERR(rbdc)) { | |
5394 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5395 | goto err_out_args; |
9d3997fd | 5396 | } |
602adf40 | 5397 | |
602adf40 | 5398 | /* pick the pool */ |
30ba1f02 | 5399 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
1fe48023 ID |
5400 | if (rc < 0) { |
5401 | if (rc == -ENOENT) | |
5402 | pr_info("pool %s does not exist\n", spec->pool_name); | |
602adf40 | 5403 | goto err_out_client; |
1fe48023 | 5404 | } |
c0cd10db | 5405 | spec->pool_id = (u64)rc; |
859c31df | 5406 | |
d147543d | 5407 | rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
b51c83c2 ID |
5408 | if (!rbd_dev) { |
5409 | rc = -ENOMEM; | |
bd4ba655 | 5410 | goto err_out_client; |
b51c83c2 | 5411 | } |
c53d5893 AE |
5412 | rbdc = NULL; /* rbd_dev now owns this */ |
5413 | spec = NULL; /* rbd_dev now owns this */ | |
d147543d | 5414 | rbd_opts = NULL; /* rbd_dev now owns this */ |
602adf40 | 5415 | |
811c6688 | 5416 | down_write(&rbd_dev->header_rwsem); |
6d69bb53 | 5417 | rc = rbd_dev_image_probe(rbd_dev, 0); |
a30b71b9 | 5418 | if (rc < 0) |
c53d5893 | 5419 | goto err_out_rbd_dev; |
05fd6f6f | 5420 | |
7ce4eef7 AE |
5421 | /* If we are mapping a snapshot it must be marked read-only */ |
5422 | ||
d147543d | 5423 | read_only = rbd_dev->opts->read_only; |
7ce4eef7 AE |
5424 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
5425 | read_only = true; | |
5426 | rbd_dev->mapping.read_only = read_only; | |
5427 | ||
b536f69a | 5428 | rc = rbd_dev_device_setup(rbd_dev); |
3abef3b3 | 5429 | if (rc) { |
e37180c0 | 5430 | /* |
99d16943 | 5431 | * rbd_unregister_watch() can't be moved into |
e37180c0 ID |
5432 | * rbd_dev_image_release() without refactoring, see |
5433 | * commit 1f3ef78861ac. | |
5434 | */ | |
99d16943 | 5435 | rbd_unregister_watch(rbd_dev); |
3abef3b3 | 5436 | rbd_dev_image_release(rbd_dev); |
dd5ac32d | 5437 | goto out; |
3abef3b3 AE |
5438 | } |
5439 | ||
dd5ac32d ID |
5440 | rc = count; |
5441 | out: | |
5442 | module_put(THIS_MODULE); | |
5443 | return rc; | |
b536f69a | 5444 | |
c53d5893 | 5445 | err_out_rbd_dev: |
811c6688 | 5446 | up_write(&rbd_dev->header_rwsem); |
c53d5893 | 5447 | rbd_dev_destroy(rbd_dev); |
bd4ba655 | 5448 | err_out_client: |
9d3997fd | 5449 | rbd_put_client(rbdc); |
0ddebc0c | 5450 | err_out_args: |
859c31df | 5451 | rbd_spec_put(spec); |
d147543d | 5452 | kfree(rbd_opts); |
dd5ac32d | 5453 | goto out; |
602adf40 YS |
5454 | } |
5455 | ||
9b60e70b ID |
5456 | static ssize_t rbd_add(struct bus_type *bus, |
5457 | const char *buf, | |
5458 | size_t count) | |
5459 | { | |
5460 | if (single_major) | |
5461 | return -EINVAL; | |
5462 | ||
5463 | return do_rbd_add(bus, buf, count); | |
5464 | } | |
5465 | ||
5466 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5467 | const char *buf, | |
5468 | size_t count) | |
5469 | { | |
5470 | return do_rbd_add(bus, buf, count); | |
5471 | } | |
5472 | ||
dd5ac32d | 5473 | static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
602adf40 | 5474 | { |
602adf40 | 5475 | rbd_free_disk(rbd_dev); |
1643dfa4 ID |
5476 | |
5477 | spin_lock(&rbd_dev_list_lock); | |
5478 | list_del_init(&rbd_dev->node); | |
5479 | spin_unlock(&rbd_dev_list_lock); | |
5480 | ||
200a6a8b | 5481 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
dd5ac32d | 5482 | device_del(&rbd_dev->dev); |
6d80b130 | 5483 | rbd_dev_mapping_clear(rbd_dev); |
9b60e70b ID |
5484 | if (!single_major) |
5485 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
602adf40 YS |
5486 | } |
5487 | ||
05a46afd AE |
5488 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5489 | { | |
ad945fc1 | 5490 | while (rbd_dev->parent) { |
05a46afd AE |
5491 | struct rbd_device *first = rbd_dev; |
5492 | struct rbd_device *second = first->parent; | |
5493 | struct rbd_device *third; | |
5494 | ||
5495 | /* | |
5496 | * Follow to the parent with no grandparent and | |
5497 | * remove it. | |
5498 | */ | |
5499 | while (second && (third = second->parent)) { | |
5500 | first = second; | |
5501 | second = third; | |
5502 | } | |
ad945fc1 | 5503 | rbd_assert(second); |
8ad42cd0 | 5504 | rbd_dev_image_release(second); |
ad945fc1 AE |
5505 | first->parent = NULL; |
5506 | first->parent_overlap = 0; | |
5507 | ||
5508 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5509 | rbd_spec_put(first->parent_spec); |
5510 | first->parent_spec = NULL; | |
05a46afd AE |
5511 | } |
5512 | } | |
5513 | ||
9b60e70b ID |
5514 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5515 | const char *buf, | |
5516 | size_t count) | |
602adf40 YS |
5517 | { |
5518 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5519 | struct list_head *tmp; |
5520 | int dev_id; | |
602adf40 | 5521 | unsigned long ul; |
82a442d2 | 5522 | bool already = false; |
0d8189e1 | 5523 | int ret; |
602adf40 | 5524 | |
bb8e0e84 | 5525 | ret = kstrtoul(buf, 10, &ul); |
0d8189e1 AE |
5526 | if (ret) |
5527 | return ret; | |
602adf40 YS |
5528 | |
5529 | /* convert to int; abort if we lost anything in the conversion */ | |
751cc0e3 AE |
5530 | dev_id = (int)ul; |
5531 | if (dev_id != ul) | |
602adf40 YS |
5532 | return -EINVAL; |
5533 | ||
751cc0e3 AE |
5534 | ret = -ENOENT; |
5535 | spin_lock(&rbd_dev_list_lock); | |
5536 | list_for_each(tmp, &rbd_dev_list) { | |
5537 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5538 | if (rbd_dev->dev_id == dev_id) { | |
5539 | ret = 0; | |
5540 | break; | |
5541 | } | |
42382b70 | 5542 | } |
751cc0e3 AE |
5543 | if (!ret) { |
5544 | spin_lock_irq(&rbd_dev->lock); | |
5545 | if (rbd_dev->open_count) | |
5546 | ret = -EBUSY; | |
5547 | else | |
82a442d2 AE |
5548 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5549 | &rbd_dev->flags); | |
751cc0e3 AE |
5550 | spin_unlock_irq(&rbd_dev->lock); |
5551 | } | |
5552 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5553 | if (ret < 0 || already) |
1ba0f1e7 | 5554 | return ret; |
751cc0e3 | 5555 | |
99d16943 | 5556 | rbd_unregister_watch(rbd_dev); |
fca27065 | 5557 | |
9875201e JD |
5558 | /* |
5559 | * Don't free anything from rbd_dev->disk until after all | |
5560 | * notifies are completely processed. Otherwise | |
5561 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting | |
5562 | * in a potential use after free of rbd_dev->disk or rbd_dev. | |
5563 | */ | |
dd5ac32d | 5564 | rbd_dev_device_release(rbd_dev); |
8ad42cd0 | 5565 | rbd_dev_image_release(rbd_dev); |
aafb230e | 5566 | |
1ba0f1e7 | 5567 | return count; |
602adf40 YS |
5568 | } |
5569 | ||
9b60e70b ID |
5570 | static ssize_t rbd_remove(struct bus_type *bus, |
5571 | const char *buf, | |
5572 | size_t count) | |
5573 | { | |
5574 | if (single_major) | |
5575 | return -EINVAL; | |
5576 | ||
5577 | return do_rbd_remove(bus, buf, count); | |
5578 | } | |
5579 | ||
5580 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5581 | const char *buf, | |
5582 | size_t count) | |
5583 | { | |
5584 | return do_rbd_remove(bus, buf, count); | |
5585 | } | |
5586 | ||
602adf40 YS |
5587 | /* |
5588 | * create control files in sysfs | |
dfc5606d | 5589 | * /sys/bus/rbd/... |
602adf40 YS |
5590 | */ |
5591 | static int rbd_sysfs_init(void) | |
5592 | { | |
dfc5606d | 5593 | int ret; |
602adf40 | 5594 | |
fed4c143 | 5595 | ret = device_register(&rbd_root_dev); |
21079786 | 5596 | if (ret < 0) |
dfc5606d | 5597 | return ret; |
602adf40 | 5598 | |
fed4c143 AE |
5599 | ret = bus_register(&rbd_bus_type); |
5600 | if (ret < 0) | |
5601 | device_unregister(&rbd_root_dev); | |
602adf40 | 5602 | |
602adf40 YS |
5603 | return ret; |
5604 | } | |
5605 | ||
5606 | static void rbd_sysfs_cleanup(void) | |
5607 | { | |
dfc5606d | 5608 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5609 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5610 | } |
5611 | ||
1c2a9dfe AE |
5612 | static int rbd_slab_init(void) |
5613 | { | |
5614 | rbd_assert(!rbd_img_request_cache); | |
03d94406 | 5615 | rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
868311b1 AE |
5616 | if (!rbd_img_request_cache) |
5617 | return -ENOMEM; | |
5618 | ||
5619 | rbd_assert(!rbd_obj_request_cache); | |
03d94406 | 5620 | rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
78c2a44a AE |
5621 | if (!rbd_obj_request_cache) |
5622 | goto out_err; | |
5623 | ||
5624 | rbd_assert(!rbd_segment_name_cache); | |
5625 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
2d0ebc5d | 5626 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
78c2a44a | 5627 | if (rbd_segment_name_cache) |
1c2a9dfe | 5628 | return 0; |
78c2a44a | 5629 | out_err: |
13bf2834 JL |
5630 | kmem_cache_destroy(rbd_obj_request_cache); |
5631 | rbd_obj_request_cache = NULL; | |
1c2a9dfe | 5632 | |
868311b1 AE |
5633 | kmem_cache_destroy(rbd_img_request_cache); |
5634 | rbd_img_request_cache = NULL; | |
5635 | ||
1c2a9dfe AE |
5636 | return -ENOMEM; |
5637 | } | |
5638 | ||
5639 | static void rbd_slab_exit(void) | |
5640 | { | |
78c2a44a AE |
5641 | rbd_assert(rbd_segment_name_cache); |
5642 | kmem_cache_destroy(rbd_segment_name_cache); | |
5643 | rbd_segment_name_cache = NULL; | |
5644 | ||
868311b1 AE |
5645 | rbd_assert(rbd_obj_request_cache); |
5646 | kmem_cache_destroy(rbd_obj_request_cache); | |
5647 | rbd_obj_request_cache = NULL; | |
5648 | ||
1c2a9dfe AE |
5649 | rbd_assert(rbd_img_request_cache); |
5650 | kmem_cache_destroy(rbd_img_request_cache); | |
5651 | rbd_img_request_cache = NULL; | |
5652 | } | |
5653 | ||
cc344fa1 | 5654 | static int __init rbd_init(void) |
602adf40 YS |
5655 | { |
5656 | int rc; | |
5657 | ||
1e32d34c AE |
5658 | if (!libceph_compatible(NULL)) { |
5659 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5660 | return -EINVAL; |
5661 | } | |
e1b4d96d | 5662 | |
1c2a9dfe | 5663 | rc = rbd_slab_init(); |
602adf40 YS |
5664 | if (rc) |
5665 | return rc; | |
e1b4d96d | 5666 | |
f5ee37bd ID |
5667 | /* |
5668 | * The number of active work items is limited by the number of | |
f77303bd | 5669 | * rbd devices * queue depth, so leave @max_active at default. |
f5ee37bd ID |
5670 | */ |
5671 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
5672 | if (!rbd_wq) { | |
5673 | rc = -ENOMEM; | |
5674 | goto err_out_slab; | |
5675 | } | |
5676 | ||
9b60e70b ID |
5677 | if (single_major) { |
5678 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5679 | if (rbd_major < 0) { | |
5680 | rc = rbd_major; | |
f5ee37bd | 5681 | goto err_out_wq; |
9b60e70b ID |
5682 | } |
5683 | } | |
5684 | ||
1c2a9dfe AE |
5685 | rc = rbd_sysfs_init(); |
5686 | if (rc) | |
9b60e70b ID |
5687 | goto err_out_blkdev; |
5688 | ||
5689 | if (single_major) | |
5690 | pr_info("loaded (major %d)\n", rbd_major); | |
5691 | else | |
5692 | pr_info("loaded\n"); | |
1c2a9dfe | 5693 | |
e1b4d96d ID |
5694 | return 0; |
5695 | ||
9b60e70b ID |
5696 | err_out_blkdev: |
5697 | if (single_major) | |
5698 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
5699 | err_out_wq: |
5700 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
5701 | err_out_slab: |
5702 | rbd_slab_exit(); | |
1c2a9dfe | 5703 | return rc; |
602adf40 YS |
5704 | } |
5705 | ||
cc344fa1 | 5706 | static void __exit rbd_exit(void) |
602adf40 | 5707 | { |
ffe312cf | 5708 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 5709 | rbd_sysfs_cleanup(); |
9b60e70b ID |
5710 | if (single_major) |
5711 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 5712 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 5713 | rbd_slab_exit(); |
602adf40 YS |
5714 | } |
5715 | ||
5716 | module_init(rbd_init); | |
5717 | module_exit(rbd_exit); | |
5718 | ||
d552c619 | 5719 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
5720 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
5721 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
5722 | /* following authorship retained from original osdblk.c */ |
5723 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5724 | ||
90da258b | 5725 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 5726 | MODULE_LICENSE("GPL"); |