Commit | Line | Data |
---|---|---|
e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
30d1cff8 | 36 | #include <linux/bsearch.h> |
602adf40 YS |
37 | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/blkdev.h> | |
1c2a9dfe | 43 | #include <linux/slab.h> |
f8a22fc2 | 44 | #include <linux/idr.h> |
bc1ecc65 | 45 | #include <linux/workqueue.h> |
602adf40 YS |
46 | |
47 | #include "rbd_types.h" | |
48 | ||
aafb230e AE |
49 | #define RBD_DEBUG /* Activate rbd_assert() calls */ |
50 | ||
593a9e7b AE |
51 | /* |
52 | * The basic unit of block I/O is a sector. It is interpreted in a | |
53 | * number of contexts in Linux (blk, bio, genhd), but the default is | |
54 | * universally 512 bytes. These symbols are just slightly more | |
55 | * meaningful than the bare numbers they represent. | |
56 | */ | |
57 | #define SECTOR_SHIFT 9 | |
58 | #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) | |
59 | ||
a2acd00e AE |
60 | /* |
61 | * Increment the given counter and return its updated value. | |
62 | * If the counter is already 0 it will not be incremented. | |
63 | * If the counter is already at its maximum value returns | |
64 | * -EINVAL without updating it. | |
65 | */ | |
66 | static int atomic_inc_return_safe(atomic_t *v) | |
67 | { | |
68 | unsigned int counter; | |
69 | ||
70 | counter = (unsigned int)__atomic_add_unless(v, 1, 0); | |
71 | if (counter <= (unsigned int)INT_MAX) | |
72 | return (int)counter; | |
73 | ||
74 | atomic_dec(v); | |
75 | ||
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | /* Decrement the counter. Return the resulting value, or -EINVAL */ | |
80 | static int atomic_dec_return_safe(atomic_t *v) | |
81 | { | |
82 | int counter; | |
83 | ||
84 | counter = atomic_dec_return(v); | |
85 | if (counter >= 0) | |
86 | return counter; | |
87 | ||
88 | atomic_inc(v); | |
89 | ||
90 | return -EINVAL; | |
91 | } | |
92 | ||
f0f8cef5 | 93 | #define RBD_DRV_NAME "rbd" |
602adf40 | 94 | |
7e513d43 ID |
95 | #define RBD_MINORS_PER_MAJOR 256 |
96 | #define RBD_SINGLE_MAJOR_PART_SHIFT 4 | |
602adf40 | 97 | |
d4b125e9 AE |
98 | #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
99 | #define RBD_MAX_SNAP_NAME_LEN \ | |
100 | (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) | |
101 | ||
35d489f9 | 102 | #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
602adf40 YS |
103 | |
104 | #define RBD_SNAP_HEAD_NAME "-" | |
105 | ||
9682fc6d AE |
106 | #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
107 | ||
9e15b77d AE |
108 | /* This allows a single page to hold an image name sent by OSD */ |
109 | #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) | |
1e130199 | 110 | #define RBD_IMAGE_ID_LEN_MAX 64 |
9e15b77d | 111 | |
1e130199 | 112 | #define RBD_OBJ_PREFIX_LEN_MAX 64 |
589d30e0 | 113 | |
d889140c AE |
114 | /* Feature bits */ |
115 | ||
5cbf6f12 AE |
116 | #define RBD_FEATURE_LAYERING (1<<0) |
117 | #define RBD_FEATURE_STRIPINGV2 (1<<1) | |
118 | #define RBD_FEATURES_ALL \ | |
119 | (RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2) | |
d889140c AE |
120 | |
121 | /* Features supported by this (client software) implementation. */ | |
122 | ||
770eba6e | 123 | #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
d889140c | 124 | |
81a89793 AE |
125 | /* |
126 | * An RBD device name will be "rbd#", where the "rbd" comes from | |
127 | * RBD_DRV_NAME above, and # is a unique integer identifier. | |
128 | * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big | |
129 | * enough to hold all possible device names. | |
130 | */ | |
602adf40 | 131 | #define DEV_NAME_LEN 32 |
81a89793 | 132 | #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
602adf40 YS |
133 | |
134 | /* | |
135 | * block device image metadata (in-memory version) | |
136 | */ | |
137 | struct rbd_image_header { | |
f35a4dee | 138 | /* These six fields never change for a given rbd image */ |
849b4260 | 139 | char *object_prefix; |
602adf40 YS |
140 | __u8 obj_order; |
141 | __u8 crypt_type; | |
142 | __u8 comp_type; | |
f35a4dee AE |
143 | u64 stripe_unit; |
144 | u64 stripe_count; | |
145 | u64 features; /* Might be changeable someday? */ | |
602adf40 | 146 | |
f84344f3 AE |
147 | /* The remaining fields need to be updated occasionally */ |
148 | u64 image_size; | |
149 | struct ceph_snap_context *snapc; | |
f35a4dee AE |
150 | char *snap_names; /* format 1 only */ |
151 | u64 *snap_sizes; /* format 1 only */ | |
59c2be1e YS |
152 | }; |
153 | ||
0d7dbfce AE |
154 | /* |
155 | * An rbd image specification. | |
156 | * | |
157 | * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely | |
c66c6e0c AE |
158 | * identify an image. Each rbd_dev structure includes a pointer to |
159 | * an rbd_spec structure that encapsulates this identity. | |
160 | * | |
161 | * Each of the id's in an rbd_spec has an associated name. For a | |
162 | * user-mapped image, the names are supplied and the id's associated | |
163 | * with them are looked up. For a layered image, a parent image is | |
164 | * defined by the tuple, and the names are looked up. | |
165 | * | |
166 | * An rbd_dev structure contains a parent_spec pointer which is | |
167 | * non-null if the image it represents is a child in a layered | |
168 | * image. This pointer will refer to the rbd_spec structure used | |
169 | * by the parent rbd_dev for its own identity (i.e., the structure | |
170 | * is shared between the parent and child). | |
171 | * | |
172 | * Since these structures are populated once, during the discovery | |
173 | * phase of image construction, they are effectively immutable so | |
174 | * we make no effort to synchronize access to them. | |
175 | * | |
176 | * Note that code herein does not assume the image name is known (it | |
177 | * could be a null pointer). | |
0d7dbfce AE |
178 | */ |
179 | struct rbd_spec { | |
180 | u64 pool_id; | |
ecb4dc22 | 181 | const char *pool_name; |
0d7dbfce | 182 | |
ecb4dc22 AE |
183 | const char *image_id; |
184 | const char *image_name; | |
0d7dbfce AE |
185 | |
186 | u64 snap_id; | |
ecb4dc22 | 187 | const char *snap_name; |
0d7dbfce AE |
188 | |
189 | struct kref kref; | |
190 | }; | |
191 | ||
602adf40 | 192 | /* |
f0f8cef5 | 193 | * an instance of the client. multiple devices may share an rbd client. |
602adf40 YS |
194 | */ |
195 | struct rbd_client { | |
196 | struct ceph_client *client; | |
197 | struct kref kref; | |
198 | struct list_head node; | |
199 | }; | |
200 | ||
bf0d5f50 AE |
201 | struct rbd_img_request; |
202 | typedef void (*rbd_img_callback_t)(struct rbd_img_request *); | |
203 | ||
204 | #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ | |
205 | ||
206 | struct rbd_obj_request; | |
207 | typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); | |
208 | ||
9969ebc5 AE |
209 | enum obj_request_type { |
210 | OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES | |
211 | }; | |
bf0d5f50 | 212 | |
6d2940c8 GZ |
213 | enum obj_operation_type { |
214 | OBJ_OP_WRITE, | |
215 | OBJ_OP_READ, | |
90e98c52 | 216 | OBJ_OP_DISCARD, |
6d2940c8 GZ |
217 | }; |
218 | ||
926f9b3f AE |
219 | enum obj_req_flags { |
220 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 221 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
222 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
223 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
224 | }; |
225 | ||
bf0d5f50 AE |
226 | struct rbd_obj_request { |
227 | const char *object_name; | |
228 | u64 offset; /* object start byte */ | |
229 | u64 length; /* bytes from offset */ | |
926f9b3f | 230 | unsigned long flags; |
bf0d5f50 | 231 | |
c5b5ef6c AE |
232 | /* |
233 | * An object request associated with an image will have its | |
234 | * img_data flag set; a standalone object request will not. | |
235 | * | |
236 | * A standalone object request will have which == BAD_WHICH | |
237 | * and a null obj_request pointer. | |
238 | * | |
239 | * An object request initiated in support of a layered image | |
240 | * object (to check for its existence before a write) will | |
241 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
242 | * | |
243 | * Finally, an object request for rbd image data will have | |
244 | * which != BAD_WHICH, and will have a non-null img_request | |
245 | * pointer. The value of which will be in the range | |
246 | * 0..(img_request->obj_request_count-1). | |
247 | */ | |
248 | union { | |
249 | struct rbd_obj_request *obj_request; /* STAT op */ | |
250 | struct { | |
251 | struct rbd_img_request *img_request; | |
252 | u64 img_offset; | |
253 | /* links for img_request->obj_requests list */ | |
254 | struct list_head links; | |
255 | }; | |
256 | }; | |
bf0d5f50 AE |
257 | u32 which; /* posn image request list */ |
258 | ||
259 | enum obj_request_type type; | |
788e2df3 AE |
260 | union { |
261 | struct bio *bio_list; | |
262 | struct { | |
263 | struct page **pages; | |
264 | u32 page_count; | |
265 | }; | |
266 | }; | |
0eefd470 | 267 | struct page **copyup_pages; |
ebda6408 | 268 | u32 copyup_page_count; |
bf0d5f50 AE |
269 | |
270 | struct ceph_osd_request *osd_req; | |
271 | ||
272 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 273 | int result; |
bf0d5f50 AE |
274 | |
275 | rbd_obj_callback_t callback; | |
788e2df3 | 276 | struct completion completion; |
bf0d5f50 AE |
277 | |
278 | struct kref kref; | |
279 | }; | |
280 | ||
0c425248 | 281 | enum img_req_flags { |
9849e986 AE |
282 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
283 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 284 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
90e98c52 | 285 | IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
0c425248 AE |
286 | }; |
287 | ||
bf0d5f50 | 288 | struct rbd_img_request { |
bf0d5f50 AE |
289 | struct rbd_device *rbd_dev; |
290 | u64 offset; /* starting image byte offset */ | |
291 | u64 length; /* byte count from offset */ | |
0c425248 | 292 | unsigned long flags; |
bf0d5f50 | 293 | union { |
9849e986 | 294 | u64 snap_id; /* for reads */ |
bf0d5f50 | 295 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
296 | }; |
297 | union { | |
298 | struct request *rq; /* block request */ | |
299 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 300 | }; |
3d7efd18 | 301 | struct page **copyup_pages; |
ebda6408 | 302 | u32 copyup_page_count; |
bf0d5f50 AE |
303 | spinlock_t completion_lock;/* protects next_completion */ |
304 | u32 next_completion; | |
305 | rbd_img_callback_t callback; | |
55f27e09 | 306 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 307 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
308 | |
309 | u32 obj_request_count; | |
310 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
311 | ||
312 | struct kref kref; | |
313 | }; | |
314 | ||
315 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 316 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 317 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 318 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 319 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 320 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 321 | |
f84344f3 | 322 | struct rbd_mapping { |
99c1f08f | 323 | u64 size; |
34b13184 | 324 | u64 features; |
f84344f3 AE |
325 | bool read_only; |
326 | }; | |
327 | ||
602adf40 YS |
328 | /* |
329 | * a single device | |
330 | */ | |
331 | struct rbd_device { | |
de71a297 | 332 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
333 | |
334 | int major; /* blkdev assigned major */ | |
dd82fff1 | 335 | int minor; |
602adf40 | 336 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 337 | |
a30b71b9 | 338 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
339 | struct rbd_client *rbd_client; |
340 | ||
341 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
342 | ||
bc1ecc65 | 343 | struct list_head rq_queue; /* incoming rq queue */ |
b82d167b | 344 | spinlock_t lock; /* queue, flags, open_count */ |
bc1ecc65 | 345 | struct work_struct rq_work; |
602adf40 YS |
346 | |
347 | struct rbd_image_header header; | |
b82d167b | 348 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 349 | struct rbd_spec *spec; |
602adf40 | 350 | |
0d7dbfce | 351 | char *header_name; |
971f839a | 352 | |
0903e875 AE |
353 | struct ceph_file_layout layout; |
354 | ||
59c2be1e | 355 | struct ceph_osd_event *watch_event; |
975241af | 356 | struct rbd_obj_request *watch_request; |
59c2be1e | 357 | |
86b00e0d AE |
358 | struct rbd_spec *parent_spec; |
359 | u64 parent_overlap; | |
a2acd00e | 360 | atomic_t parent_ref; |
2f82ee54 | 361 | struct rbd_device *parent; |
86b00e0d | 362 | |
c666601a JD |
363 | /* protects updating the header */ |
364 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
365 | |
366 | struct rbd_mapping mapping; | |
602adf40 YS |
367 | |
368 | struct list_head node; | |
dfc5606d | 369 | |
dfc5606d YS |
370 | /* sysfs related */ |
371 | struct device dev; | |
b82d167b | 372 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
373 | }; |
374 | ||
b82d167b AE |
375 | /* |
376 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
377 | * rbd_dev->lock is used to protect access. | |
378 | * | |
379 | * Currently, only the "removing" flag (which is coupled with the | |
380 | * "open_count" field) requires atomic access. | |
381 | */ | |
6d292906 AE |
382 | enum rbd_dev_flags { |
383 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 384 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
385 | }; |
386 | ||
cfbf6377 | 387 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 388 | |
602adf40 | 389 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
390 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
391 | ||
432b8587 AE |
392 | static LIST_HEAD(rbd_client_list); /* clients */ |
393 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 394 | |
78c2a44a AE |
395 | /* Slab caches for frequently-allocated structures */ |
396 | ||
1c2a9dfe | 397 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 398 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 399 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 400 | |
9b60e70b | 401 | static int rbd_major; |
f8a22fc2 ID |
402 | static DEFINE_IDA(rbd_dev_id_ida); |
403 | ||
f5ee37bd ID |
404 | static struct workqueue_struct *rbd_wq; |
405 | ||
9b60e70b ID |
406 | /* |
407 | * Default to false for now, as single-major requires >= 0.75 version of | |
408 | * userspace rbd utility. | |
409 | */ | |
410 | static bool single_major = false; | |
411 | module_param(single_major, bool, S_IRUGO); | |
412 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); | |
413 | ||
3d7efd18 AE |
414 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
415 | ||
200a6a8b | 416 | static void rbd_dev_device_release(struct device *dev); |
dfc5606d | 417 | |
f0f8cef5 AE |
418 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
419 | size_t count); | |
420 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
421 | size_t count); | |
9b60e70b ID |
422 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
423 | size_t count); | |
424 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
425 | size_t count); | |
1f3ef788 | 426 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping); |
a2acd00e | 427 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 428 | |
9b60e70b ID |
429 | static int rbd_dev_id_to_minor(int dev_id) |
430 | { | |
7e513d43 | 431 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
432 | } |
433 | ||
434 | static int minor_to_rbd_dev_id(int minor) | |
435 | { | |
7e513d43 | 436 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
437 | } |
438 | ||
b15a21dd GKH |
439 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
440 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
441 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
442 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
b15a21dd GKH |
443 | |
444 | static struct attribute *rbd_bus_attrs[] = { | |
445 | &bus_attr_add.attr, | |
446 | &bus_attr_remove.attr, | |
9b60e70b ID |
447 | &bus_attr_add_single_major.attr, |
448 | &bus_attr_remove_single_major.attr, | |
b15a21dd | 449 | NULL, |
f0f8cef5 | 450 | }; |
92c76dc0 ID |
451 | |
452 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
453 | struct attribute *attr, int index) | |
454 | { | |
9b60e70b ID |
455 | if (!single_major && |
456 | (attr == &bus_attr_add_single_major.attr || | |
457 | attr == &bus_attr_remove_single_major.attr)) | |
458 | return 0; | |
459 | ||
92c76dc0 ID |
460 | return attr->mode; |
461 | } | |
462 | ||
463 | static const struct attribute_group rbd_bus_group = { | |
464 | .attrs = rbd_bus_attrs, | |
465 | .is_visible = rbd_bus_is_visible, | |
466 | }; | |
467 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
468 | |
469 | static struct bus_type rbd_bus_type = { | |
470 | .name = "rbd", | |
b15a21dd | 471 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
472 | }; |
473 | ||
474 | static void rbd_root_dev_release(struct device *dev) | |
475 | { | |
476 | } | |
477 | ||
478 | static struct device rbd_root_dev = { | |
479 | .init_name = "rbd", | |
480 | .release = rbd_root_dev_release, | |
481 | }; | |
482 | ||
06ecc6cb AE |
483 | static __printf(2, 3) |
484 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
485 | { | |
486 | struct va_format vaf; | |
487 | va_list args; | |
488 | ||
489 | va_start(args, fmt); | |
490 | vaf.fmt = fmt; | |
491 | vaf.va = &args; | |
492 | ||
493 | if (!rbd_dev) | |
494 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
495 | else if (rbd_dev->disk) | |
496 | printk(KERN_WARNING "%s: %s: %pV\n", | |
497 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
498 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
499 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
500 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
501 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
502 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
503 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
504 | else /* punt */ | |
505 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
506 | RBD_DRV_NAME, rbd_dev, &vaf); | |
507 | va_end(args); | |
508 | } | |
509 | ||
aafb230e AE |
510 | #ifdef RBD_DEBUG |
511 | #define rbd_assert(expr) \ | |
512 | if (unlikely(!(expr))) { \ | |
513 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
514 | "at line %d:\n\n" \ | |
515 | "\trbd_assert(%s);\n\n", \ | |
516 | __func__, __LINE__, #expr); \ | |
517 | BUG(); \ | |
518 | } | |
519 | #else /* !RBD_DEBUG */ | |
520 | # define rbd_assert(expr) ((void) 0) | |
521 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 522 | |
b454e36d | 523 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
524 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
525 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 526 | |
cc4a38bd | 527 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 528 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 529 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 530 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
531 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
532 | u64 snap_id); | |
2ad3d716 AE |
533 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
534 | u8 *order, u64 *snap_size); | |
535 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
536 | u64 *snap_features); | |
537 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); | |
59c2be1e | 538 | |
602adf40 YS |
539 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
540 | { | |
f0f8cef5 | 541 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 542 | bool removing = false; |
602adf40 | 543 | |
f84344f3 | 544 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
545 | return -EROFS; |
546 | ||
a14ea269 | 547 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
548 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
549 | removing = true; | |
550 | else | |
551 | rbd_dev->open_count++; | |
a14ea269 | 552 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
553 | if (removing) |
554 | return -ENOENT; | |
555 | ||
c3e946ce | 556 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 557 | |
602adf40 YS |
558 | return 0; |
559 | } | |
560 | ||
db2a144b | 561 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
562 | { |
563 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
564 | unsigned long open_count_before; |
565 | ||
a14ea269 | 566 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 567 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 568 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 569 | rbd_assert(open_count_before > 0); |
dfc5606d | 570 | |
c3e946ce | 571 | put_device(&rbd_dev->dev); |
dfc5606d YS |
572 | } |
573 | ||
131fd9f6 GZ |
574 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
575 | { | |
77f33c03 | 576 | int ret = 0; |
131fd9f6 GZ |
577 | int val; |
578 | bool ro; | |
77f33c03 | 579 | bool ro_changed = false; |
131fd9f6 | 580 | |
77f33c03 | 581 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
131fd9f6 GZ |
582 | if (get_user(val, (int __user *)(arg))) |
583 | return -EFAULT; | |
584 | ||
585 | ro = val ? true : false; | |
586 | /* Snapshot doesn't allow to write*/ | |
587 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) | |
588 | return -EROFS; | |
589 | ||
77f33c03 JD |
590 | spin_lock_irq(&rbd_dev->lock); |
591 | /* prevent others open this device */ | |
592 | if (rbd_dev->open_count > 1) { | |
593 | ret = -EBUSY; | |
594 | goto out; | |
595 | } | |
596 | ||
131fd9f6 GZ |
597 | if (rbd_dev->mapping.read_only != ro) { |
598 | rbd_dev->mapping.read_only = ro; | |
77f33c03 | 599 | ro_changed = true; |
131fd9f6 GZ |
600 | } |
601 | ||
77f33c03 JD |
602 | out: |
603 | spin_unlock_irq(&rbd_dev->lock); | |
604 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ | |
605 | if (ret == 0 && ro_changed) | |
606 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); | |
607 | ||
608 | return ret; | |
131fd9f6 GZ |
609 | } |
610 | ||
611 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
612 | unsigned int cmd, unsigned long arg) | |
613 | { | |
614 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
615 | int ret = 0; | |
616 | ||
131fd9f6 GZ |
617 | switch (cmd) { |
618 | case BLKROSET: | |
619 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
620 | break; | |
621 | default: | |
622 | ret = -ENOTTY; | |
623 | } | |
624 | ||
131fd9f6 GZ |
625 | return ret; |
626 | } | |
627 | ||
628 | #ifdef CONFIG_COMPAT | |
629 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
630 | unsigned int cmd, unsigned long arg) | |
631 | { | |
632 | return rbd_ioctl(bdev, mode, cmd, arg); | |
633 | } | |
634 | #endif /* CONFIG_COMPAT */ | |
635 | ||
602adf40 YS |
636 | static const struct block_device_operations rbd_bd_ops = { |
637 | .owner = THIS_MODULE, | |
638 | .open = rbd_open, | |
dfc5606d | 639 | .release = rbd_release, |
131fd9f6 GZ |
640 | .ioctl = rbd_ioctl, |
641 | #ifdef CONFIG_COMPAT | |
642 | .compat_ioctl = rbd_compat_ioctl, | |
643 | #endif | |
602adf40 YS |
644 | }; |
645 | ||
646 | /* | |
7262cfca | 647 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 648 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 649 | */ |
f8c38929 | 650 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
651 | { |
652 | struct rbd_client *rbdc; | |
653 | int ret = -ENOMEM; | |
654 | ||
37206ee5 | 655 | dout("%s:\n", __func__); |
602adf40 YS |
656 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
657 | if (!rbdc) | |
658 | goto out_opt; | |
659 | ||
660 | kref_init(&rbdc->kref); | |
661 | INIT_LIST_HEAD(&rbdc->node); | |
662 | ||
43ae4701 | 663 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 664 | if (IS_ERR(rbdc->client)) |
08f75463 | 665 | goto out_rbdc; |
43ae4701 | 666 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
667 | |
668 | ret = ceph_open_session(rbdc->client); | |
669 | if (ret < 0) | |
08f75463 | 670 | goto out_client; |
602adf40 | 671 | |
432b8587 | 672 | spin_lock(&rbd_client_list_lock); |
602adf40 | 673 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 674 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 675 | |
37206ee5 | 676 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 677 | |
602adf40 | 678 | return rbdc; |
08f75463 | 679 | out_client: |
602adf40 | 680 | ceph_destroy_client(rbdc->client); |
08f75463 | 681 | out_rbdc: |
602adf40 YS |
682 | kfree(rbdc); |
683 | out_opt: | |
43ae4701 AE |
684 | if (ceph_opts) |
685 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
686 | dout("%s: error %d\n", __func__, ret); |
687 | ||
28f259b7 | 688 | return ERR_PTR(ret); |
602adf40 YS |
689 | } |
690 | ||
2f82ee54 AE |
691 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
692 | { | |
693 | kref_get(&rbdc->kref); | |
694 | ||
695 | return rbdc; | |
696 | } | |
697 | ||
602adf40 | 698 | /* |
1f7ba331 AE |
699 | * Find a ceph client with specific addr and configuration. If |
700 | * found, bump its reference count. | |
602adf40 | 701 | */ |
1f7ba331 | 702 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
703 | { |
704 | struct rbd_client *client_node; | |
1f7ba331 | 705 | bool found = false; |
602adf40 | 706 | |
43ae4701 | 707 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
708 | return NULL; |
709 | ||
1f7ba331 AE |
710 | spin_lock(&rbd_client_list_lock); |
711 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
712 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
713 | __rbd_get_client(client_node); |
714 | ||
1f7ba331 AE |
715 | found = true; |
716 | break; | |
717 | } | |
718 | } | |
719 | spin_unlock(&rbd_client_list_lock); | |
720 | ||
721 | return found ? client_node : NULL; | |
602adf40 YS |
722 | } |
723 | ||
59c2be1e YS |
724 | /* |
725 | * mount options | |
726 | */ | |
727 | enum { | |
59c2be1e YS |
728 | Opt_last_int, |
729 | /* int args above */ | |
730 | Opt_last_string, | |
731 | /* string args above */ | |
cc0538b6 AE |
732 | Opt_read_only, |
733 | Opt_read_write, | |
734 | /* Boolean args above */ | |
735 | Opt_last_bool, | |
59c2be1e YS |
736 | }; |
737 | ||
43ae4701 | 738 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
739 | /* int args above */ |
740 | /* string args above */ | |
be466c1c | 741 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
742 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
743 | {Opt_read_write, "read_write"}, | |
744 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
745 | /* Boolean args above */ | |
59c2be1e YS |
746 | {-1, NULL} |
747 | }; | |
748 | ||
98571b5a AE |
749 | struct rbd_options { |
750 | bool read_only; | |
751 | }; | |
752 | ||
753 | #define RBD_READ_ONLY_DEFAULT false | |
754 | ||
59c2be1e YS |
755 | static int parse_rbd_opts_token(char *c, void *private) |
756 | { | |
43ae4701 | 757 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
758 | substring_t argstr[MAX_OPT_ARGS]; |
759 | int token, intval, ret; | |
760 | ||
43ae4701 | 761 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
762 | if (token < 0) |
763 | return -EINVAL; | |
764 | ||
765 | if (token < Opt_last_int) { | |
766 | ret = match_int(&argstr[0], &intval); | |
767 | if (ret < 0) { | |
768 | pr_err("bad mount option arg (not int) " | |
769 | "at '%s'\n", c); | |
770 | return ret; | |
771 | } | |
772 | dout("got int token %d val %d\n", token, intval); | |
773 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
774 | dout("got string token %d val %s\n", token, | |
775 | argstr[0].from); | |
cc0538b6 AE |
776 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
777 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
778 | } else { |
779 | dout("got token %d\n", token); | |
780 | } | |
781 | ||
782 | switch (token) { | |
cc0538b6 AE |
783 | case Opt_read_only: |
784 | rbd_opts->read_only = true; | |
785 | break; | |
786 | case Opt_read_write: | |
787 | rbd_opts->read_only = false; | |
788 | break; | |
59c2be1e | 789 | default: |
aafb230e AE |
790 | rbd_assert(false); |
791 | break; | |
59c2be1e YS |
792 | } |
793 | return 0; | |
794 | } | |
795 | ||
6d2940c8 GZ |
796 | static char* obj_op_name(enum obj_operation_type op_type) |
797 | { | |
798 | switch (op_type) { | |
799 | case OBJ_OP_READ: | |
800 | return "read"; | |
801 | case OBJ_OP_WRITE: | |
802 | return "write"; | |
90e98c52 GZ |
803 | case OBJ_OP_DISCARD: |
804 | return "discard"; | |
6d2940c8 GZ |
805 | default: |
806 | return "???"; | |
807 | } | |
808 | } | |
809 | ||
602adf40 YS |
810 | /* |
811 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
812 | * not exist create it. Either way, ceph_opts is consumed by this |
813 | * function. | |
602adf40 | 814 | */ |
9d3997fd | 815 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 816 | { |
f8c38929 | 817 | struct rbd_client *rbdc; |
59c2be1e | 818 | |
cfbf6377 | 819 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 820 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 821 | if (rbdc) /* using an existing client */ |
43ae4701 | 822 | ceph_destroy_options(ceph_opts); |
9d3997fd | 823 | else |
f8c38929 | 824 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 825 | mutex_unlock(&client_mutex); |
602adf40 | 826 | |
9d3997fd | 827 | return rbdc; |
602adf40 YS |
828 | } |
829 | ||
830 | /* | |
831 | * Destroy ceph client | |
d23a4b3f | 832 | * |
432b8587 | 833 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
834 | */ |
835 | static void rbd_client_release(struct kref *kref) | |
836 | { | |
837 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
838 | ||
37206ee5 | 839 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 840 | spin_lock(&rbd_client_list_lock); |
602adf40 | 841 | list_del(&rbdc->node); |
cd9d9f5d | 842 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
843 | |
844 | ceph_destroy_client(rbdc->client); | |
845 | kfree(rbdc); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
850 | * it. | |
851 | */ | |
9d3997fd | 852 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 853 | { |
c53d5893 AE |
854 | if (rbdc) |
855 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
856 | } |
857 | ||
a30b71b9 AE |
858 | static bool rbd_image_format_valid(u32 image_format) |
859 | { | |
860 | return image_format == 1 || image_format == 2; | |
861 | } | |
862 | ||
8e94af8e AE |
863 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
864 | { | |
103a150f AE |
865 | size_t size; |
866 | u32 snap_count; | |
867 | ||
868 | /* The header has to start with the magic rbd header text */ | |
869 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
870 | return false; | |
871 | ||
db2388b6 AE |
872 | /* The bio layer requires at least sector-sized I/O */ |
873 | ||
874 | if (ondisk->options.order < SECTOR_SHIFT) | |
875 | return false; | |
876 | ||
877 | /* If we use u64 in a few spots we may be able to loosen this */ | |
878 | ||
879 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
880 | return false; | |
881 | ||
103a150f AE |
882 | /* |
883 | * The size of a snapshot header has to fit in a size_t, and | |
884 | * that limits the number of snapshots. | |
885 | */ | |
886 | snap_count = le32_to_cpu(ondisk->snap_count); | |
887 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
888 | if (snap_count > size / sizeof (__le64)) | |
889 | return false; | |
890 | ||
891 | /* | |
892 | * Not only that, but the size of the entire the snapshot | |
893 | * header must also be representable in a size_t. | |
894 | */ | |
895 | size -= snap_count * sizeof (__le64); | |
896 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
897 | return false; | |
898 | ||
899 | return true; | |
8e94af8e AE |
900 | } |
901 | ||
602adf40 | 902 | /* |
bb23e37a AE |
903 | * Fill an rbd image header with information from the given format 1 |
904 | * on-disk header. | |
602adf40 | 905 | */ |
662518b1 | 906 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 907 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 908 | { |
662518b1 | 909 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
910 | bool first_time = header->object_prefix == NULL; |
911 | struct ceph_snap_context *snapc; | |
912 | char *object_prefix = NULL; | |
913 | char *snap_names = NULL; | |
914 | u64 *snap_sizes = NULL; | |
ccece235 | 915 | u32 snap_count; |
d2bb24e5 | 916 | size_t size; |
bb23e37a | 917 | int ret = -ENOMEM; |
621901d6 | 918 | u32 i; |
602adf40 | 919 | |
bb23e37a | 920 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 921 | |
bb23e37a AE |
922 | if (first_time) { |
923 | size_t len; | |
103a150f | 924 | |
bb23e37a AE |
925 | len = strnlen(ondisk->object_prefix, |
926 | sizeof (ondisk->object_prefix)); | |
927 | object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
928 | if (!object_prefix) | |
929 | return -ENOMEM; | |
930 | memcpy(object_prefix, ondisk->object_prefix, len); | |
931 | object_prefix[len] = '\0'; | |
932 | } | |
00f1f36f | 933 | |
bb23e37a | 934 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 935 | |
bb23e37a AE |
936 | snap_count = le32_to_cpu(ondisk->snap_count); |
937 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
938 | if (!snapc) | |
939 | goto out_err; | |
940 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 941 | if (snap_count) { |
bb23e37a | 942 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
943 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
944 | ||
bb23e37a | 945 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 946 | |
bb23e37a AE |
947 | if (snap_names_len > (u64)SIZE_MAX) |
948 | goto out_2big; | |
949 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
950 | if (!snap_names) | |
6a52325f AE |
951 | goto out_err; |
952 | ||
bb23e37a | 953 | /* ...as well as the array of their sizes. */ |
621901d6 | 954 | |
d2bb24e5 | 955 | size = snap_count * sizeof (*header->snap_sizes); |
bb23e37a AE |
956 | snap_sizes = kmalloc(size, GFP_KERNEL); |
957 | if (!snap_sizes) | |
6a52325f | 958 | goto out_err; |
bb23e37a | 959 | |
f785cc1d | 960 | /* |
bb23e37a AE |
961 | * Copy the names, and fill in each snapshot's id |
962 | * and size. | |
963 | * | |
99a41ebc | 964 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 965 | * ondisk buffer we're working with has |
f785cc1d AE |
966 | * snap_names_len bytes beyond the end of the |
967 | * snapshot id array, this memcpy() is safe. | |
968 | */ | |
bb23e37a AE |
969 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
970 | snaps = ondisk->snaps; | |
971 | for (i = 0; i < snap_count; i++) { | |
972 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
973 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
974 | } | |
602adf40 | 975 | } |
6a52325f | 976 | |
bb23e37a | 977 | /* We won't fail any more, fill in the header */ |
621901d6 | 978 | |
bb23e37a AE |
979 | if (first_time) { |
980 | header->object_prefix = object_prefix; | |
981 | header->obj_order = ondisk->options.order; | |
982 | header->crypt_type = ondisk->options.crypt_type; | |
983 | header->comp_type = ondisk->options.comp_type; | |
984 | /* The rest aren't used for format 1 images */ | |
985 | header->stripe_unit = 0; | |
986 | header->stripe_count = 0; | |
987 | header->features = 0; | |
602adf40 | 988 | } else { |
662518b1 AE |
989 | ceph_put_snap_context(header->snapc); |
990 | kfree(header->snap_names); | |
991 | kfree(header->snap_sizes); | |
602adf40 | 992 | } |
849b4260 | 993 | |
bb23e37a | 994 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 995 | |
f84344f3 | 996 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
997 | header->snapc = snapc; |
998 | header->snap_names = snap_names; | |
999 | header->snap_sizes = snap_sizes; | |
468521c1 | 1000 | |
602adf40 | 1001 | return 0; |
bb23e37a AE |
1002 | out_2big: |
1003 | ret = -EIO; | |
6a52325f | 1004 | out_err: |
bb23e37a AE |
1005 | kfree(snap_sizes); |
1006 | kfree(snap_names); | |
1007 | ceph_put_snap_context(snapc); | |
1008 | kfree(object_prefix); | |
ccece235 | 1009 | |
bb23e37a | 1010 | return ret; |
602adf40 YS |
1011 | } |
1012 | ||
9682fc6d AE |
1013 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
1014 | { | |
1015 | const char *snap_name; | |
1016 | ||
1017 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
1018 | ||
1019 | /* Skip over names until we find the one we are looking for */ | |
1020 | ||
1021 | snap_name = rbd_dev->header.snap_names; | |
1022 | while (which--) | |
1023 | snap_name += strlen(snap_name) + 1; | |
1024 | ||
1025 | return kstrdup(snap_name, GFP_KERNEL); | |
1026 | } | |
1027 | ||
30d1cff8 AE |
1028 | /* |
1029 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1030 | * Note that result is for snapshots in *descending* order. | |
1031 | */ | |
1032 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1033 | { | |
1034 | u64 snap_id1 = *(u64 *)s1; | |
1035 | u64 snap_id2 = *(u64 *)s2; | |
1036 | ||
1037 | if (snap_id1 < snap_id2) | |
1038 | return 1; | |
1039 | return snap_id1 == snap_id2 ? 0 : -1; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Search a snapshot context to see if the given snapshot id is | |
1044 | * present. | |
1045 | * | |
1046 | * Returns the position of the snapshot id in the array if it's found, | |
1047 | * or BAD_SNAP_INDEX otherwise. | |
1048 | * | |
1049 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1050 | * reverse order, highest snapshot id first. | |
1051 | */ | |
9682fc6d AE |
1052 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1053 | { | |
1054 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1055 | u64 *found; |
9682fc6d | 1056 | |
30d1cff8 AE |
1057 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1058 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1059 | |
30d1cff8 | 1060 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1061 | } |
1062 | ||
2ad3d716 AE |
1063 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1064 | u64 snap_id) | |
9e15b77d | 1065 | { |
54cac61f | 1066 | u32 which; |
da6a6b63 | 1067 | const char *snap_name; |
9e15b77d | 1068 | |
54cac61f AE |
1069 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1070 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1071 | return ERR_PTR(-ENOENT); |
54cac61f | 1072 | |
da6a6b63 JD |
1073 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1074 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1075 | } |
1076 | ||
1077 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1078 | { | |
9e15b77d AE |
1079 | if (snap_id == CEPH_NOSNAP) |
1080 | return RBD_SNAP_HEAD_NAME; | |
1081 | ||
54cac61f AE |
1082 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1083 | if (rbd_dev->image_format == 1) | |
1084 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1085 | |
54cac61f | 1086 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1087 | } |
1088 | ||
2ad3d716 AE |
1089 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1090 | u64 *snap_size) | |
602adf40 | 1091 | { |
2ad3d716 AE |
1092 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1093 | if (snap_id == CEPH_NOSNAP) { | |
1094 | *snap_size = rbd_dev->header.image_size; | |
1095 | } else if (rbd_dev->image_format == 1) { | |
1096 | u32 which; | |
602adf40 | 1097 | |
2ad3d716 AE |
1098 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1099 | if (which == BAD_SNAP_INDEX) | |
1100 | return -ENOENT; | |
e86924a8 | 1101 | |
2ad3d716 AE |
1102 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1103 | } else { | |
1104 | u64 size = 0; | |
1105 | int ret; | |
1106 | ||
1107 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1108 | if (ret) | |
1109 | return ret; | |
1110 | ||
1111 | *snap_size = size; | |
1112 | } | |
1113 | return 0; | |
602adf40 YS |
1114 | } |
1115 | ||
2ad3d716 AE |
1116 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1117 | u64 *snap_features) | |
602adf40 | 1118 | { |
2ad3d716 AE |
1119 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1120 | if (snap_id == CEPH_NOSNAP) { | |
1121 | *snap_features = rbd_dev->header.features; | |
1122 | } else if (rbd_dev->image_format == 1) { | |
1123 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1124 | } else { |
2ad3d716 AE |
1125 | u64 features = 0; |
1126 | int ret; | |
8b0241f8 | 1127 | |
2ad3d716 AE |
1128 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1129 | if (ret) | |
1130 | return ret; | |
1131 | ||
1132 | *snap_features = features; | |
1133 | } | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1138 | { | |
8f4b7d98 | 1139 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1140 | u64 size = 0; |
1141 | u64 features = 0; | |
1142 | int ret; | |
1143 | ||
2ad3d716 AE |
1144 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1145 | if (ret) | |
1146 | return ret; | |
1147 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1148 | if (ret) | |
1149 | return ret; | |
1150 | ||
1151 | rbd_dev->mapping.size = size; | |
1152 | rbd_dev->mapping.features = features; | |
1153 | ||
8b0241f8 | 1154 | return 0; |
602adf40 YS |
1155 | } |
1156 | ||
d1cf5788 AE |
1157 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1158 | { | |
1159 | rbd_dev->mapping.size = 0; | |
1160 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1161 | } |
1162 | ||
7d5079aa HS |
1163 | static void rbd_segment_name_free(const char *name) |
1164 | { | |
1165 | /* The explicit cast here is needed to drop the const qualifier */ | |
1166 | ||
1167 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
1168 | } | |
1169 | ||
98571b5a | 1170 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 1171 | { |
65ccfe21 AE |
1172 | char *name; |
1173 | u64 segment; | |
1174 | int ret; | |
3a96d5cd | 1175 | char *name_format; |
602adf40 | 1176 | |
78c2a44a | 1177 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
1178 | if (!name) |
1179 | return NULL; | |
1180 | segment = offset >> rbd_dev->header.obj_order; | |
3a96d5cd JD |
1181 | name_format = "%s.%012llx"; |
1182 | if (rbd_dev->image_format == 2) | |
1183 | name_format = "%s.%016llx"; | |
2d0ebc5d | 1184 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
65ccfe21 | 1185 | rbd_dev->header.object_prefix, segment); |
2d0ebc5d | 1186 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
65ccfe21 AE |
1187 | pr_err("error formatting segment name for #%llu (%d)\n", |
1188 | segment, ret); | |
7d5079aa | 1189 | rbd_segment_name_free(name); |
65ccfe21 AE |
1190 | name = NULL; |
1191 | } | |
602adf40 | 1192 | |
65ccfe21 AE |
1193 | return name; |
1194 | } | |
602adf40 | 1195 | |
65ccfe21 AE |
1196 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1197 | { | |
1198 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 1199 | |
65ccfe21 AE |
1200 | return offset & (segment_size - 1); |
1201 | } | |
1202 | ||
1203 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1204 | u64 offset, u64 length) | |
1205 | { | |
1206 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1207 | ||
1208 | offset &= segment_size - 1; | |
1209 | ||
aafb230e | 1210 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1211 | if (offset + length > segment_size) |
1212 | length = segment_size - offset; | |
1213 | ||
1214 | return length; | |
602adf40 YS |
1215 | } |
1216 | ||
029bcbd8 JD |
1217 | /* |
1218 | * returns the size of an object in the image | |
1219 | */ | |
1220 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1221 | { | |
1222 | return 1 << header->obj_order; | |
1223 | } | |
1224 | ||
602adf40 YS |
1225 | /* |
1226 | * bio helpers | |
1227 | */ | |
1228 | ||
1229 | static void bio_chain_put(struct bio *chain) | |
1230 | { | |
1231 | struct bio *tmp; | |
1232 | ||
1233 | while (chain) { | |
1234 | tmp = chain; | |
1235 | chain = chain->bi_next; | |
1236 | bio_put(tmp); | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * zeros a bio chain, starting at specific offset | |
1242 | */ | |
1243 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1244 | { | |
7988613b KO |
1245 | struct bio_vec bv; |
1246 | struct bvec_iter iter; | |
602adf40 YS |
1247 | unsigned long flags; |
1248 | void *buf; | |
602adf40 YS |
1249 | int pos = 0; |
1250 | ||
1251 | while (chain) { | |
7988613b KO |
1252 | bio_for_each_segment(bv, chain, iter) { |
1253 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1254 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1255 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1256 | memset(buf + remainder, 0, |
7988613b KO |
1257 | bv.bv_len - remainder); |
1258 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1259 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1260 | } |
7988613b | 1261 | pos += bv.bv_len; |
602adf40 YS |
1262 | } |
1263 | ||
1264 | chain = chain->bi_next; | |
1265 | } | |
1266 | } | |
1267 | ||
b9434c5b AE |
1268 | /* |
1269 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1270 | * starting at the given byte offset from the start of the array and | |
1271 | * continuing up to the given end offset. The pages array is | |
1272 | * assumed to be big enough to hold all bytes up to the end. | |
1273 | */ | |
1274 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1275 | { | |
1276 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1277 | ||
1278 | rbd_assert(end > offset); | |
1279 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1280 | while (offset < end) { | |
1281 | size_t page_offset; | |
1282 | size_t length; | |
1283 | unsigned long flags; | |
1284 | void *kaddr; | |
1285 | ||
491205a8 GU |
1286 | page_offset = offset & ~PAGE_MASK; |
1287 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1288 | local_irq_save(flags); |
1289 | kaddr = kmap_atomic(*page); | |
1290 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1291 | flush_dcache_page(*page); |
b9434c5b AE |
1292 | kunmap_atomic(kaddr); |
1293 | local_irq_restore(flags); | |
1294 | ||
1295 | offset += length; | |
1296 | page++; | |
1297 | } | |
1298 | } | |
1299 | ||
602adf40 | 1300 | /* |
f7760dad AE |
1301 | * Clone a portion of a bio, starting at the given byte offset |
1302 | * and continuing for the number of bytes indicated. | |
602adf40 | 1303 | */ |
f7760dad AE |
1304 | static struct bio *bio_clone_range(struct bio *bio_src, |
1305 | unsigned int offset, | |
1306 | unsigned int len, | |
1307 | gfp_t gfpmask) | |
602adf40 | 1308 | { |
f7760dad AE |
1309 | struct bio *bio; |
1310 | ||
5341a627 | 1311 | bio = bio_clone(bio_src, gfpmask); |
f7760dad AE |
1312 | if (!bio) |
1313 | return NULL; /* ENOMEM */ | |
602adf40 | 1314 | |
5341a627 | 1315 | bio_advance(bio, offset); |
4f024f37 | 1316 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1317 | |
1318 | return bio; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Clone a portion of a bio chain, starting at the given byte offset | |
1323 | * into the first bio in the source chain and continuing for the | |
1324 | * number of bytes indicated. The result is another bio chain of | |
1325 | * exactly the given length, or a null pointer on error. | |
1326 | * | |
1327 | * The bio_src and offset parameters are both in-out. On entry they | |
1328 | * refer to the first source bio and the offset into that bio where | |
1329 | * the start of data to be cloned is located. | |
1330 | * | |
1331 | * On return, bio_src is updated to refer to the bio in the source | |
1332 | * chain that contains first un-cloned byte, and *offset will | |
1333 | * contain the offset of that byte within that bio. | |
1334 | */ | |
1335 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1336 | unsigned int *offset, | |
1337 | unsigned int len, | |
1338 | gfp_t gfpmask) | |
1339 | { | |
1340 | struct bio *bi = *bio_src; | |
1341 | unsigned int off = *offset; | |
1342 | struct bio *chain = NULL; | |
1343 | struct bio **end; | |
1344 | ||
1345 | /* Build up a chain of clone bios up to the limit */ | |
1346 | ||
4f024f37 | 1347 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1348 | return NULL; /* Nothing to clone */ |
602adf40 | 1349 | |
f7760dad AE |
1350 | end = &chain; |
1351 | while (len) { | |
1352 | unsigned int bi_size; | |
1353 | struct bio *bio; | |
1354 | ||
f5400b7a AE |
1355 | if (!bi) { |
1356 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1357 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1358 | } |
4f024f37 | 1359 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1360 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1361 | if (!bio) | |
1362 | goto out_err; /* ENOMEM */ | |
1363 | ||
1364 | *end = bio; | |
1365 | end = &bio->bi_next; | |
602adf40 | 1366 | |
f7760dad | 1367 | off += bi_size; |
4f024f37 | 1368 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1369 | bi = bi->bi_next; |
1370 | off = 0; | |
1371 | } | |
1372 | len -= bi_size; | |
1373 | } | |
1374 | *bio_src = bi; | |
1375 | *offset = off; | |
1376 | ||
1377 | return chain; | |
1378 | out_err: | |
1379 | bio_chain_put(chain); | |
602adf40 | 1380 | |
602adf40 YS |
1381 | return NULL; |
1382 | } | |
1383 | ||
926f9b3f AE |
1384 | /* |
1385 | * The default/initial value for all object request flags is 0. For | |
1386 | * each flag, once its value is set to 1 it is never reset to 0 | |
1387 | * again. | |
1388 | */ | |
57acbaa7 | 1389 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1390 | { |
57acbaa7 | 1391 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1392 | struct rbd_device *rbd_dev; |
1393 | ||
57acbaa7 | 1394 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1395 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1396 | obj_request); |
1397 | } | |
1398 | } | |
1399 | ||
57acbaa7 | 1400 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1401 | { |
1402 | smp_mb(); | |
57acbaa7 | 1403 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1404 | } |
1405 | ||
57acbaa7 | 1406 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1407 | { |
57acbaa7 AE |
1408 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1409 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1410 | |
57acbaa7 AE |
1411 | if (obj_request_img_data_test(obj_request)) |
1412 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1413 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1414 | obj_request); |
1415 | } | |
1416 | } | |
1417 | ||
57acbaa7 | 1418 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1419 | { |
1420 | smp_mb(); | |
57acbaa7 | 1421 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1422 | } |
1423 | ||
5679c59f AE |
1424 | /* |
1425 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1426 | * flag. The latter is set based on the "exists" value provided. | |
1427 | * | |
1428 | * Note that for our purposes once an object exists it never goes | |
1429 | * away again. It's possible that the response from two existence | |
1430 | * checks are separated by the creation of the target object, and | |
1431 | * the first ("doesn't exist") response arrives *after* the second | |
1432 | * ("does exist"). In that case we ignore the second one. | |
1433 | */ | |
1434 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1435 | bool exists) | |
1436 | { | |
1437 | if (exists) | |
1438 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1439 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1440 | smp_mb(); | |
1441 | } | |
1442 | ||
1443 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1444 | { | |
1445 | smp_mb(); | |
1446 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1447 | } | |
1448 | ||
1449 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1450 | { | |
1451 | smp_mb(); | |
1452 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1453 | } | |
1454 | ||
9638556a ID |
1455 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1456 | { | |
1457 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1458 | ||
1459 | return obj_request->img_offset < | |
1460 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1461 | } | |
1462 | ||
bf0d5f50 AE |
1463 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1464 | { | |
37206ee5 AE |
1465 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1466 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1467 | kref_get(&obj_request->kref); |
1468 | } | |
1469 | ||
1470 | static void rbd_obj_request_destroy(struct kref *kref); | |
1471 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1472 | { | |
1473 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1474 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1475 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1476 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1477 | } | |
1478 | ||
0f2d5be7 AE |
1479 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1480 | { | |
1481 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
1482 | atomic_read(&img_request->kref.refcount)); | |
1483 | kref_get(&img_request->kref); | |
1484 | } | |
1485 | ||
e93f3152 AE |
1486 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1487 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1488 | static void rbd_img_request_destroy(struct kref *kref); |
1489 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1490 | { | |
1491 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1492 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1493 | atomic_read(&img_request->kref.refcount)); | |
e93f3152 AE |
1494 | if (img_request_child_test(img_request)) |
1495 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1496 | else | |
1497 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1498 | } |
1499 | ||
1500 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1501 | struct rbd_obj_request *obj_request) | |
1502 | { | |
25dcf954 AE |
1503 | rbd_assert(obj_request->img_request == NULL); |
1504 | ||
b155e86c | 1505 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1506 | obj_request->img_request = img_request; |
25dcf954 | 1507 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1508 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1509 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1510 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1511 | img_request->obj_request_count++; |
1512 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1513 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1514 | obj_request->which); | |
bf0d5f50 AE |
1515 | } |
1516 | ||
1517 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1518 | struct rbd_obj_request *obj_request) | |
1519 | { | |
1520 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1521 | |
37206ee5 AE |
1522 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1523 | obj_request->which); | |
bf0d5f50 | 1524 | list_del(&obj_request->links); |
25dcf954 AE |
1525 | rbd_assert(img_request->obj_request_count > 0); |
1526 | img_request->obj_request_count--; | |
1527 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1528 | obj_request->which = BAD_WHICH; | |
6365d33a | 1529 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1530 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1531 | obj_request->img_request = NULL; |
25dcf954 | 1532 | obj_request->callback = NULL; |
bf0d5f50 AE |
1533 | rbd_obj_request_put(obj_request); |
1534 | } | |
1535 | ||
1536 | static bool obj_request_type_valid(enum obj_request_type type) | |
1537 | { | |
1538 | switch (type) { | |
9969ebc5 | 1539 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1540 | case OBJ_REQUEST_BIO: |
788e2df3 | 1541 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1542 | return true; |
1543 | default: | |
1544 | return false; | |
1545 | } | |
1546 | } | |
1547 | ||
bf0d5f50 AE |
1548 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1549 | struct rbd_obj_request *obj_request) | |
1550 | { | |
71c20a06 | 1551 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1552 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1553 | } | |
1554 | ||
71c20a06 ID |
1555 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
1556 | { | |
1557 | dout("%s %p\n", __func__, obj_request); | |
1558 | ceph_osdc_cancel_request(obj_request->osd_req); | |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * Wait for an object request to complete. If interrupted, cancel the | |
1563 | * underlying osd request. | |
1564 | */ | |
1565 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1566 | { | |
1567 | int ret; | |
1568 | ||
1569 | dout("%s %p\n", __func__, obj_request); | |
1570 | ||
1571 | ret = wait_for_completion_interruptible(&obj_request->completion); | |
1572 | if (ret < 0) { | |
1573 | dout("%s %p interrupted\n", __func__, obj_request); | |
1574 | rbd_obj_request_end(obj_request); | |
1575 | return ret; | |
1576 | } | |
1577 | ||
1578 | dout("%s %p done\n", __func__, obj_request); | |
1579 | return 0; | |
1580 | } | |
1581 | ||
bf0d5f50 AE |
1582 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1583 | { | |
55f27e09 | 1584 | |
37206ee5 | 1585 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1586 | |
1587 | /* | |
1588 | * If no error occurred, compute the aggregate transfer | |
1589 | * count for the image request. We could instead use | |
1590 | * atomic64_cmpxchg() to update it as each object request | |
1591 | * completes; not clear which way is better off hand. | |
1592 | */ | |
1593 | if (!img_request->result) { | |
1594 | struct rbd_obj_request *obj_request; | |
1595 | u64 xferred = 0; | |
1596 | ||
1597 | for_each_obj_request(img_request, obj_request) | |
1598 | xferred += obj_request->xferred; | |
1599 | img_request->xferred = xferred; | |
1600 | } | |
1601 | ||
bf0d5f50 AE |
1602 | if (img_request->callback) |
1603 | img_request->callback(img_request); | |
1604 | else | |
1605 | rbd_img_request_put(img_request); | |
1606 | } | |
1607 | ||
0c425248 AE |
1608 | /* |
1609 | * The default/initial value for all image request flags is 0. Each | |
1610 | * is conditionally set to 1 at image request initialization time | |
1611 | * and currently never change thereafter. | |
1612 | */ | |
1613 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1614 | { | |
1615 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1616 | smp_mb(); | |
1617 | } | |
1618 | ||
1619 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1620 | { | |
1621 | smp_mb(); | |
1622 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1623 | } | |
1624 | ||
90e98c52 GZ |
1625 | /* |
1626 | * Set the discard flag when the img_request is an discard request | |
1627 | */ | |
1628 | static void img_request_discard_set(struct rbd_img_request *img_request) | |
1629 | { | |
1630 | set_bit(IMG_REQ_DISCARD, &img_request->flags); | |
1631 | smp_mb(); | |
1632 | } | |
1633 | ||
1634 | static bool img_request_discard_test(struct rbd_img_request *img_request) | |
1635 | { | |
1636 | smp_mb(); | |
1637 | return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; | |
1638 | } | |
1639 | ||
9849e986 AE |
1640 | static void img_request_child_set(struct rbd_img_request *img_request) |
1641 | { | |
1642 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1643 | smp_mb(); | |
1644 | } | |
1645 | ||
e93f3152 AE |
1646 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1647 | { | |
1648 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1649 | smp_mb(); | |
1650 | } | |
1651 | ||
9849e986 AE |
1652 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1653 | { | |
1654 | smp_mb(); | |
1655 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1656 | } | |
1657 | ||
d0b2e944 AE |
1658 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1659 | { | |
1660 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1661 | smp_mb(); | |
1662 | } | |
1663 | ||
a2acd00e AE |
1664 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1665 | { | |
1666 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1667 | smp_mb(); | |
1668 | } | |
1669 | ||
d0b2e944 AE |
1670 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1671 | { | |
1672 | smp_mb(); | |
1673 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1674 | } | |
1675 | ||
3b434a2a JD |
1676 | static enum obj_operation_type |
1677 | rbd_img_request_op_type(struct rbd_img_request *img_request) | |
1678 | { | |
1679 | if (img_request_write_test(img_request)) | |
1680 | return OBJ_OP_WRITE; | |
1681 | else if (img_request_discard_test(img_request)) | |
1682 | return OBJ_OP_DISCARD; | |
1683 | else | |
1684 | return OBJ_OP_READ; | |
1685 | } | |
1686 | ||
6e2a4505 AE |
1687 | static void |
1688 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1689 | { | |
b9434c5b AE |
1690 | u64 xferred = obj_request->xferred; |
1691 | u64 length = obj_request->length; | |
1692 | ||
6e2a4505 AE |
1693 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1694 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1695 | xferred, length); |
6e2a4505 | 1696 | /* |
17c1cc1d JD |
1697 | * ENOENT means a hole in the image. We zero-fill the entire |
1698 | * length of the request. A short read also implies zero-fill | |
1699 | * to the end of the request. An error requires the whole | |
1700 | * length of the request to be reported finished with an error | |
1701 | * to the block layer. In each case we update the xferred | |
1702 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1703 | */ |
b9434c5b | 1704 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1705 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1706 | if (obj_request->type == OBJ_REQUEST_BIO) |
1707 | zero_bio_chain(obj_request->bio_list, 0); | |
1708 | else | |
1709 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1710 | obj_request->result = 0; |
b9434c5b AE |
1711 | } else if (xferred < length && !obj_request->result) { |
1712 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1713 | zero_bio_chain(obj_request->bio_list, xferred); | |
1714 | else | |
1715 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1716 | } |
17c1cc1d | 1717 | obj_request->xferred = length; |
6e2a4505 AE |
1718 | obj_request_done_set(obj_request); |
1719 | } | |
1720 | ||
bf0d5f50 AE |
1721 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1722 | { | |
37206ee5 AE |
1723 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1724 | obj_request->callback); | |
bf0d5f50 AE |
1725 | if (obj_request->callback) |
1726 | obj_request->callback(obj_request); | |
788e2df3 AE |
1727 | else |
1728 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1729 | } |
1730 | ||
c47f9371 | 1731 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1732 | { |
1733 | dout("%s: obj %p\n", __func__, obj_request); | |
1734 | obj_request_done_set(obj_request); | |
1735 | } | |
1736 | ||
c47f9371 | 1737 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1738 | { |
57acbaa7 | 1739 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1740 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1741 | bool layered = false; |
1742 | ||
1743 | if (obj_request_img_data_test(obj_request)) { | |
1744 | img_request = obj_request->img_request; | |
1745 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1746 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1747 | } |
8b3e1a56 AE |
1748 | |
1749 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1750 | obj_request, img_request, obj_request->result, | |
1751 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1752 | if (layered && obj_request->result == -ENOENT && |
1753 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1754 | rbd_img_parent_read(obj_request); |
1755 | else if (img_request) | |
6e2a4505 AE |
1756 | rbd_img_obj_request_read_callback(obj_request); |
1757 | else | |
1758 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1759 | } |
1760 | ||
c47f9371 | 1761 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1762 | { |
1b83bef2 SW |
1763 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1764 | obj_request->result, obj_request->length); | |
1765 | /* | |
8b3e1a56 AE |
1766 | * There is no such thing as a successful short write. Set |
1767 | * it to our originally-requested length. | |
1b83bef2 SW |
1768 | */ |
1769 | obj_request->xferred = obj_request->length; | |
07741308 | 1770 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1771 | } |
1772 | ||
90e98c52 GZ |
1773 | static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
1774 | { | |
1775 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, | |
1776 | obj_request->result, obj_request->length); | |
1777 | /* | |
1778 | * There is no such thing as a successful short discard. Set | |
1779 | * it to our originally-requested length. | |
1780 | */ | |
1781 | obj_request->xferred = obj_request->length; | |
d0265de7 JD |
1782 | /* discarding a non-existent object is not a problem */ |
1783 | if (obj_request->result == -ENOENT) | |
1784 | obj_request->result = 0; | |
90e98c52 GZ |
1785 | obj_request_done_set(obj_request); |
1786 | } | |
1787 | ||
fbfab539 AE |
1788 | /* |
1789 | * For a simple stat call there's nothing to do. We'll do more if | |
1790 | * this is part of a write sequence for a layered image. | |
1791 | */ | |
c47f9371 | 1792 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1793 | { |
37206ee5 | 1794 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1795 | obj_request_done_set(obj_request); |
1796 | } | |
1797 | ||
bf0d5f50 AE |
1798 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1799 | struct ceph_msg *msg) | |
1800 | { | |
1801 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1802 | u16 opcode; |
1803 | ||
37206ee5 | 1804 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1805 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1806 | if (obj_request_img_data_test(obj_request)) { |
1807 | rbd_assert(obj_request->img_request); | |
1808 | rbd_assert(obj_request->which != BAD_WHICH); | |
1809 | } else { | |
1810 | rbd_assert(obj_request->which == BAD_WHICH); | |
1811 | } | |
bf0d5f50 | 1812 | |
1b83bef2 SW |
1813 | if (osd_req->r_result < 0) |
1814 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1815 | |
7cc69d42 | 1816 | rbd_assert(osd_req->r_num_ops <= CEPH_OSD_MAX_OP); |
bf0d5f50 | 1817 | |
c47f9371 AE |
1818 | /* |
1819 | * We support a 64-bit length, but ultimately it has to be | |
1820 | * passed to blk_end_request(), which takes an unsigned int. | |
1821 | */ | |
1b83bef2 | 1822 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1823 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1824 | |
79528734 | 1825 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1826 | switch (opcode) { |
1827 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1828 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1829 | break; |
0ccd5926 ID |
1830 | case CEPH_OSD_OP_SETALLOCHINT: |
1831 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE); | |
1832 | /* fall through */ | |
bf0d5f50 | 1833 | case CEPH_OSD_OP_WRITE: |
c47f9371 | 1834 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1835 | break; |
fbfab539 | 1836 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1837 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1838 | break; |
90e98c52 GZ |
1839 | case CEPH_OSD_OP_DELETE: |
1840 | case CEPH_OSD_OP_TRUNCATE: | |
1841 | case CEPH_OSD_OP_ZERO: | |
1842 | rbd_osd_discard_callback(obj_request); | |
1843 | break; | |
36be9a76 | 1844 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1845 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1846 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1847 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1848 | break; |
bf0d5f50 | 1849 | default: |
9584d508 | 1850 | rbd_warn(NULL, "%s: unsupported op %hu", |
bf0d5f50 AE |
1851 | obj_request->object_name, (unsigned short) opcode); |
1852 | break; | |
1853 | } | |
1854 | ||
07741308 | 1855 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1856 | rbd_obj_request_complete(obj_request); |
1857 | } | |
1858 | ||
9d4df01f | 1859 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1860 | { |
1861 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1862 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1863 | u64 snap_id; |
430c28c3 | 1864 | |
8c042b0d | 1865 | rbd_assert(osd_req != NULL); |
430c28c3 | 1866 | |
9d4df01f | 1867 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1868 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1869 | NULL, snap_id, NULL); |
1870 | } | |
1871 | ||
1872 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1873 | { | |
1874 | struct rbd_img_request *img_request = obj_request->img_request; | |
1875 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1876 | struct ceph_snap_context *snapc; | |
1877 | struct timespec mtime = CURRENT_TIME; | |
1878 | ||
1879 | rbd_assert(osd_req != NULL); | |
1880 | ||
1881 | snapc = img_request ? img_request->snapc : NULL; | |
1882 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1883 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1884 | } |
1885 | ||
0ccd5926 ID |
1886 | /* |
1887 | * Create an osd request. A read request has one osd op (read). | |
1888 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1889 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1890 | * technically osd watch is a write request, hence this distinction.) | |
1891 | */ | |
bf0d5f50 AE |
1892 | static struct ceph_osd_request *rbd_osd_req_create( |
1893 | struct rbd_device *rbd_dev, | |
6d2940c8 | 1894 | enum obj_operation_type op_type, |
deb236b3 | 1895 | unsigned int num_ops, |
430c28c3 | 1896 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1897 | { |
bf0d5f50 AE |
1898 | struct ceph_snap_context *snapc = NULL; |
1899 | struct ceph_osd_client *osdc; | |
1900 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1901 | |
90e98c52 GZ |
1902 | if (obj_request_img_data_test(obj_request) && |
1903 | (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { | |
6365d33a | 1904 | struct rbd_img_request *img_request = obj_request->img_request; |
90e98c52 GZ |
1905 | if (op_type == OBJ_OP_WRITE) { |
1906 | rbd_assert(img_request_write_test(img_request)); | |
1907 | } else { | |
1908 | rbd_assert(img_request_discard_test(img_request)); | |
1909 | } | |
6d2940c8 | 1910 | snapc = img_request->snapc; |
bf0d5f50 AE |
1911 | } |
1912 | ||
6d2940c8 | 1913 | rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
deb236b3 ID |
1914 | |
1915 | /* Allocate and initialize the request, for the num_ops ops */ | |
bf0d5f50 AE |
1916 | |
1917 | osdc = &rbd_dev->rbd_client->client->osdc; | |
deb236b3 ID |
1918 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
1919 | GFP_ATOMIC); | |
bf0d5f50 AE |
1920 | if (!osd_req) |
1921 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1922 | |
90e98c52 | 1923 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
bf0d5f50 | 1924 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1925 | else |
bf0d5f50 | 1926 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1927 | |
1928 | osd_req->r_callback = rbd_osd_req_callback; | |
1929 | osd_req->r_priv = obj_request; | |
1930 | ||
3c972c95 ID |
1931 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1932 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
bf0d5f50 | 1933 | |
bf0d5f50 AE |
1934 | return osd_req; |
1935 | } | |
1936 | ||
0eefd470 | 1937 | /* |
d3246fb0 JD |
1938 | * Create a copyup osd request based on the information in the object |
1939 | * request supplied. A copyup request has two or three osd ops, a | |
1940 | * copyup method call, potentially a hint op, and a write or truncate | |
1941 | * or zero op. | |
0eefd470 AE |
1942 | */ |
1943 | static struct ceph_osd_request * | |
1944 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1945 | { | |
1946 | struct rbd_img_request *img_request; | |
1947 | struct ceph_snap_context *snapc; | |
1948 | struct rbd_device *rbd_dev; | |
1949 | struct ceph_osd_client *osdc; | |
1950 | struct ceph_osd_request *osd_req; | |
d3246fb0 | 1951 | int num_osd_ops = 3; |
0eefd470 AE |
1952 | |
1953 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1954 | img_request = obj_request->img_request; | |
1955 | rbd_assert(img_request); | |
d3246fb0 JD |
1956 | rbd_assert(img_request_write_test(img_request) || |
1957 | img_request_discard_test(img_request)); | |
0eefd470 | 1958 | |
d3246fb0 JD |
1959 | if (img_request_discard_test(img_request)) |
1960 | num_osd_ops = 2; | |
1961 | ||
1962 | /* Allocate and initialize the request, for all the ops */ | |
0eefd470 AE |
1963 | |
1964 | snapc = img_request->snapc; | |
1965 | rbd_dev = img_request->rbd_dev; | |
1966 | osdc = &rbd_dev->rbd_client->client->osdc; | |
d3246fb0 JD |
1967 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_osd_ops, |
1968 | false, GFP_ATOMIC); | |
0eefd470 AE |
1969 | if (!osd_req) |
1970 | return NULL; /* ENOMEM */ | |
1971 | ||
1972 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1973 | osd_req->r_callback = rbd_osd_req_callback; | |
1974 | osd_req->r_priv = obj_request; | |
1975 | ||
3c972c95 ID |
1976 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1977 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
0eefd470 | 1978 | |
0eefd470 AE |
1979 | return osd_req; |
1980 | } | |
1981 | ||
1982 | ||
bf0d5f50 AE |
1983 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1984 | { | |
1985 | ceph_osdc_put_request(osd_req); | |
1986 | } | |
1987 | ||
1988 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1989 | ||
1990 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1991 | u64 offset, u64 length, | |
1992 | enum obj_request_type type) | |
1993 | { | |
1994 | struct rbd_obj_request *obj_request; | |
1995 | size_t size; | |
1996 | char *name; | |
1997 | ||
1998 | rbd_assert(obj_request_type_valid(type)); | |
1999 | ||
2000 | size = strlen(object_name) + 1; | |
f907ad55 AE |
2001 | name = kmalloc(size, GFP_KERNEL); |
2002 | if (!name) | |
bf0d5f50 AE |
2003 | return NULL; |
2004 | ||
868311b1 | 2005 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL); |
f907ad55 AE |
2006 | if (!obj_request) { |
2007 | kfree(name); | |
2008 | return NULL; | |
2009 | } | |
2010 | ||
bf0d5f50 AE |
2011 | obj_request->object_name = memcpy(name, object_name, size); |
2012 | obj_request->offset = offset; | |
2013 | obj_request->length = length; | |
926f9b3f | 2014 | obj_request->flags = 0; |
bf0d5f50 AE |
2015 | obj_request->which = BAD_WHICH; |
2016 | obj_request->type = type; | |
2017 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 2018 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
2019 | kref_init(&obj_request->kref); |
2020 | ||
37206ee5 AE |
2021 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
2022 | offset, length, (int)type, obj_request); | |
2023 | ||
bf0d5f50 AE |
2024 | return obj_request; |
2025 | } | |
2026 | ||
2027 | static void rbd_obj_request_destroy(struct kref *kref) | |
2028 | { | |
2029 | struct rbd_obj_request *obj_request; | |
2030 | ||
2031 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
2032 | ||
37206ee5 AE |
2033 | dout("%s: obj %p\n", __func__, obj_request); |
2034 | ||
bf0d5f50 AE |
2035 | rbd_assert(obj_request->img_request == NULL); |
2036 | rbd_assert(obj_request->which == BAD_WHICH); | |
2037 | ||
2038 | if (obj_request->osd_req) | |
2039 | rbd_osd_req_destroy(obj_request->osd_req); | |
2040 | ||
2041 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
2042 | switch (obj_request->type) { | |
9969ebc5 AE |
2043 | case OBJ_REQUEST_NODATA: |
2044 | break; /* Nothing to do */ | |
bf0d5f50 AE |
2045 | case OBJ_REQUEST_BIO: |
2046 | if (obj_request->bio_list) | |
2047 | bio_chain_put(obj_request->bio_list); | |
2048 | break; | |
788e2df3 AE |
2049 | case OBJ_REQUEST_PAGES: |
2050 | if (obj_request->pages) | |
2051 | ceph_release_page_vector(obj_request->pages, | |
2052 | obj_request->page_count); | |
2053 | break; | |
bf0d5f50 AE |
2054 | } |
2055 | ||
f907ad55 | 2056 | kfree(obj_request->object_name); |
868311b1 AE |
2057 | obj_request->object_name = NULL; |
2058 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
2059 | } |
2060 | ||
fb65d228 AE |
2061 | /* It's OK to call this for a device with no parent */ |
2062 | ||
2063 | static void rbd_spec_put(struct rbd_spec *spec); | |
2064 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
2065 | { | |
2066 | rbd_dev_remove_parent(rbd_dev); | |
2067 | rbd_spec_put(rbd_dev->parent_spec); | |
2068 | rbd_dev->parent_spec = NULL; | |
2069 | rbd_dev->parent_overlap = 0; | |
2070 | } | |
2071 | ||
a2acd00e AE |
2072 | /* |
2073 | * Parent image reference counting is used to determine when an | |
2074 | * image's parent fields can be safely torn down--after there are no | |
2075 | * more in-flight requests to the parent image. When the last | |
2076 | * reference is dropped, cleaning them up is safe. | |
2077 | */ | |
2078 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2079 | { | |
2080 | int counter; | |
2081 | ||
2082 | if (!rbd_dev->parent_spec) | |
2083 | return; | |
2084 | ||
2085 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2086 | if (counter > 0) | |
2087 | return; | |
2088 | ||
2089 | /* Last reference; clean up parent data structures */ | |
2090 | ||
2091 | if (!counter) | |
2092 | rbd_dev_unparent(rbd_dev); | |
2093 | else | |
9584d508 | 2094 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
2095 | } |
2096 | ||
2097 | /* | |
2098 | * If an image has a non-zero parent overlap, get a reference to its | |
2099 | * parent. | |
2100 | * | |
2101 | * Returns true if the rbd device has a parent with a non-zero | |
2102 | * overlap and a reference for it was successfully taken, or | |
2103 | * false otherwise. | |
2104 | */ | |
2105 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2106 | { | |
ae43e9d0 | 2107 | int counter = 0; |
a2acd00e AE |
2108 | |
2109 | if (!rbd_dev->parent_spec) | |
2110 | return false; | |
2111 | ||
ae43e9d0 ID |
2112 | down_read(&rbd_dev->header_rwsem); |
2113 | if (rbd_dev->parent_overlap) | |
2114 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2115 | up_read(&rbd_dev->header_rwsem); | |
a2acd00e AE |
2116 | |
2117 | if (counter < 0) | |
9584d508 | 2118 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e | 2119 | |
ae43e9d0 | 2120 | return counter > 0; |
a2acd00e AE |
2121 | } |
2122 | ||
bf0d5f50 AE |
2123 | /* |
2124 | * Caller is responsible for filling in the list of object requests | |
2125 | * that comprises the image request, and the Linux request pointer | |
2126 | * (if there is one). | |
2127 | */ | |
cc344fa1 AE |
2128 | static struct rbd_img_request *rbd_img_request_create( |
2129 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2130 | u64 offset, u64 length, |
6d2940c8 | 2131 | enum obj_operation_type op_type, |
4e752f0a | 2132 | struct ceph_snap_context *snapc) |
bf0d5f50 AE |
2133 | { |
2134 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2135 | |
7a716aac | 2136 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
2137 | if (!img_request) |
2138 | return NULL; | |
2139 | ||
bf0d5f50 AE |
2140 | img_request->rq = NULL; |
2141 | img_request->rbd_dev = rbd_dev; | |
2142 | img_request->offset = offset; | |
2143 | img_request->length = length; | |
0c425248 | 2144 | img_request->flags = 0; |
90e98c52 GZ |
2145 | if (op_type == OBJ_OP_DISCARD) { |
2146 | img_request_discard_set(img_request); | |
2147 | img_request->snapc = snapc; | |
2148 | } else if (op_type == OBJ_OP_WRITE) { | |
0c425248 | 2149 | img_request_write_set(img_request); |
4e752f0a | 2150 | img_request->snapc = snapc; |
0c425248 | 2151 | } else { |
bf0d5f50 | 2152 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2153 | } |
a2acd00e | 2154 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2155 | img_request_layered_set(img_request); |
bf0d5f50 AE |
2156 | spin_lock_init(&img_request->completion_lock); |
2157 | img_request->next_completion = 0; | |
2158 | img_request->callback = NULL; | |
a5a337d4 | 2159 | img_request->result = 0; |
bf0d5f50 AE |
2160 | img_request->obj_request_count = 0; |
2161 | INIT_LIST_HEAD(&img_request->obj_requests); | |
2162 | kref_init(&img_request->kref); | |
2163 | ||
37206ee5 | 2164 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
6d2940c8 | 2165 | obj_op_name(op_type), offset, length, img_request); |
37206ee5 | 2166 | |
bf0d5f50 AE |
2167 | return img_request; |
2168 | } | |
2169 | ||
2170 | static void rbd_img_request_destroy(struct kref *kref) | |
2171 | { | |
2172 | struct rbd_img_request *img_request; | |
2173 | struct rbd_obj_request *obj_request; | |
2174 | struct rbd_obj_request *next_obj_request; | |
2175 | ||
2176 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2177 | ||
37206ee5 AE |
2178 | dout("%s: img %p\n", __func__, img_request); |
2179 | ||
bf0d5f50 AE |
2180 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2181 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2182 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2183 | |
a2acd00e AE |
2184 | if (img_request_layered_test(img_request)) { |
2185 | img_request_layered_clear(img_request); | |
2186 | rbd_dev_parent_put(img_request->rbd_dev); | |
2187 | } | |
2188 | ||
bef95455 JD |
2189 | if (img_request_write_test(img_request) || |
2190 | img_request_discard_test(img_request)) | |
812164f8 | 2191 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2192 | |
1c2a9dfe | 2193 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2194 | } |
2195 | ||
e93f3152 AE |
2196 | static struct rbd_img_request *rbd_parent_request_create( |
2197 | struct rbd_obj_request *obj_request, | |
2198 | u64 img_offset, u64 length) | |
2199 | { | |
2200 | struct rbd_img_request *parent_request; | |
2201 | struct rbd_device *rbd_dev; | |
2202 | ||
2203 | rbd_assert(obj_request->img_request); | |
2204 | rbd_dev = obj_request->img_request->rbd_dev; | |
2205 | ||
4e752f0a | 2206 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
6d2940c8 | 2207 | length, OBJ_OP_READ, NULL); |
e93f3152 AE |
2208 | if (!parent_request) |
2209 | return NULL; | |
2210 | ||
2211 | img_request_child_set(parent_request); | |
2212 | rbd_obj_request_get(obj_request); | |
2213 | parent_request->obj_request = obj_request; | |
2214 | ||
2215 | return parent_request; | |
2216 | } | |
2217 | ||
2218 | static void rbd_parent_request_destroy(struct kref *kref) | |
2219 | { | |
2220 | struct rbd_img_request *parent_request; | |
2221 | struct rbd_obj_request *orig_request; | |
2222 | ||
2223 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2224 | orig_request = parent_request->obj_request; | |
2225 | ||
2226 | parent_request->obj_request = NULL; | |
2227 | rbd_obj_request_put(orig_request); | |
2228 | img_request_child_clear(parent_request); | |
2229 | ||
2230 | rbd_img_request_destroy(kref); | |
2231 | } | |
2232 | ||
1217857f AE |
2233 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2234 | { | |
6365d33a | 2235 | struct rbd_img_request *img_request; |
1217857f AE |
2236 | unsigned int xferred; |
2237 | int result; | |
8b3e1a56 | 2238 | bool more; |
1217857f | 2239 | |
6365d33a AE |
2240 | rbd_assert(obj_request_img_data_test(obj_request)); |
2241 | img_request = obj_request->img_request; | |
2242 | ||
1217857f AE |
2243 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2244 | xferred = (unsigned int)obj_request->xferred; | |
2245 | result = obj_request->result; | |
2246 | if (result) { | |
2247 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
6d2940c8 GZ |
2248 | enum obj_operation_type op_type; |
2249 | ||
90e98c52 GZ |
2250 | if (img_request_discard_test(img_request)) |
2251 | op_type = OBJ_OP_DISCARD; | |
2252 | else if (img_request_write_test(img_request)) | |
2253 | op_type = OBJ_OP_WRITE; | |
2254 | else | |
2255 | op_type = OBJ_OP_READ; | |
1217857f | 2256 | |
9584d508 | 2257 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
6d2940c8 GZ |
2258 | obj_op_name(op_type), obj_request->length, |
2259 | obj_request->img_offset, obj_request->offset); | |
9584d508 | 2260 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
2261 | result, xferred); |
2262 | if (!img_request->result) | |
2263 | img_request->result = result; | |
2264 | } | |
2265 | ||
f1a4739f AE |
2266 | /* Image object requests don't own their page array */ |
2267 | ||
2268 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
2269 | obj_request->pages = NULL; | |
2270 | obj_request->page_count = 0; | |
2271 | } | |
2272 | ||
8b3e1a56 AE |
2273 | if (img_request_child_test(img_request)) { |
2274 | rbd_assert(img_request->obj_request != NULL); | |
2275 | more = obj_request->which < img_request->obj_request_count - 1; | |
2276 | } else { | |
2277 | rbd_assert(img_request->rq != NULL); | |
2278 | more = blk_end_request(img_request->rq, result, xferred); | |
2279 | } | |
2280 | ||
2281 | return more; | |
1217857f AE |
2282 | } |
2283 | ||
2169238d AE |
2284 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2285 | { | |
2286 | struct rbd_img_request *img_request; | |
2287 | u32 which = obj_request->which; | |
2288 | bool more = true; | |
2289 | ||
6365d33a | 2290 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2291 | img_request = obj_request->img_request; |
2292 | ||
2293 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2294 | rbd_assert(img_request != NULL); | |
2169238d AE |
2295 | rbd_assert(img_request->obj_request_count > 0); |
2296 | rbd_assert(which != BAD_WHICH); | |
2297 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2298 | |
2299 | spin_lock_irq(&img_request->completion_lock); | |
2300 | if (which != img_request->next_completion) | |
2301 | goto out; | |
2302 | ||
2303 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2304 | rbd_assert(more); |
2305 | rbd_assert(which < img_request->obj_request_count); | |
2306 | ||
2307 | if (!obj_request_done_test(obj_request)) | |
2308 | break; | |
1217857f | 2309 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2310 | which++; |
2311 | } | |
2312 | ||
2313 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2314 | img_request->next_completion = which; | |
2315 | out: | |
2316 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2317 | rbd_img_request_put(img_request); |
2169238d AE |
2318 | |
2319 | if (!more) | |
2320 | rbd_img_request_complete(img_request); | |
2321 | } | |
2322 | ||
3b434a2a JD |
2323 | /* |
2324 | * Add individual osd ops to the given ceph_osd_request and prepare | |
2325 | * them for submission. num_ops is the current number of | |
2326 | * osd operations already to the object request. | |
2327 | */ | |
2328 | static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, | |
2329 | struct ceph_osd_request *osd_request, | |
2330 | enum obj_operation_type op_type, | |
2331 | unsigned int num_ops) | |
2332 | { | |
2333 | struct rbd_img_request *img_request = obj_request->img_request; | |
2334 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2335 | u64 object_size = rbd_obj_bytes(&rbd_dev->header); | |
2336 | u64 offset = obj_request->offset; | |
2337 | u64 length = obj_request->length; | |
2338 | u64 img_end; | |
2339 | u16 opcode; | |
2340 | ||
2341 | if (op_type == OBJ_OP_DISCARD) { | |
d3246fb0 JD |
2342 | if (!offset && length == object_size && |
2343 | (!img_request_layered_test(img_request) || | |
2344 | !obj_request_overlaps_parent(obj_request))) { | |
3b434a2a JD |
2345 | opcode = CEPH_OSD_OP_DELETE; |
2346 | } else if ((offset + length == object_size)) { | |
2347 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2348 | } else { | |
2349 | down_read(&rbd_dev->header_rwsem); | |
2350 | img_end = rbd_dev->header.image_size; | |
2351 | up_read(&rbd_dev->header_rwsem); | |
2352 | ||
2353 | if (obj_request->img_offset + length == img_end) | |
2354 | opcode = CEPH_OSD_OP_TRUNCATE; | |
2355 | else | |
2356 | opcode = CEPH_OSD_OP_ZERO; | |
2357 | } | |
2358 | } else if (op_type == OBJ_OP_WRITE) { | |
2359 | opcode = CEPH_OSD_OP_WRITE; | |
2360 | osd_req_op_alloc_hint_init(osd_request, num_ops, | |
2361 | object_size, object_size); | |
2362 | num_ops++; | |
2363 | } else { | |
2364 | opcode = CEPH_OSD_OP_READ; | |
2365 | } | |
2366 | ||
7e868b6e ID |
2367 | if (opcode == CEPH_OSD_OP_DELETE) |
2368 | osd_req_op_init(osd_request, num_ops, opcode); | |
2369 | else | |
2370 | osd_req_op_extent_init(osd_request, num_ops, opcode, | |
2371 | offset, length, 0, 0); | |
2372 | ||
3b434a2a JD |
2373 | if (obj_request->type == OBJ_REQUEST_BIO) |
2374 | osd_req_op_extent_osd_data_bio(osd_request, num_ops, | |
2375 | obj_request->bio_list, length); | |
2376 | else if (obj_request->type == OBJ_REQUEST_PAGES) | |
2377 | osd_req_op_extent_osd_data_pages(osd_request, num_ops, | |
2378 | obj_request->pages, length, | |
2379 | offset & ~PAGE_MASK, false, false); | |
2380 | ||
2381 | /* Discards are also writes */ | |
2382 | if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) | |
2383 | rbd_osd_req_format_write(obj_request); | |
2384 | else | |
2385 | rbd_osd_req_format_read(obj_request); | |
2386 | } | |
2387 | ||
f1a4739f AE |
2388 | /* |
2389 | * Split up an image request into one or more object requests, each | |
2390 | * to a different object. The "type" parameter indicates whether | |
2391 | * "data_desc" is the pointer to the head of a list of bio | |
2392 | * structures, or the base of a page array. In either case this | |
2393 | * function assumes data_desc describes memory sufficient to hold | |
2394 | * all data described by the image request. | |
2395 | */ | |
2396 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2397 | enum obj_request_type type, | |
2398 | void *data_desc) | |
bf0d5f50 AE |
2399 | { |
2400 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2401 | struct rbd_obj_request *obj_request = NULL; | |
2402 | struct rbd_obj_request *next_obj_request; | |
a158073c | 2403 | struct bio *bio_list = NULL; |
f1a4739f | 2404 | unsigned int bio_offset = 0; |
a158073c | 2405 | struct page **pages = NULL; |
6d2940c8 | 2406 | enum obj_operation_type op_type; |
7da22d29 | 2407 | u64 img_offset; |
bf0d5f50 | 2408 | u64 resid; |
bf0d5f50 | 2409 | |
f1a4739f AE |
2410 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2411 | (int)type, data_desc); | |
37206ee5 | 2412 | |
7da22d29 | 2413 | img_offset = img_request->offset; |
bf0d5f50 | 2414 | resid = img_request->length; |
4dda41d3 | 2415 | rbd_assert(resid > 0); |
3b434a2a | 2416 | op_type = rbd_img_request_op_type(img_request); |
f1a4739f AE |
2417 | |
2418 | if (type == OBJ_REQUEST_BIO) { | |
2419 | bio_list = data_desc; | |
4f024f37 KO |
2420 | rbd_assert(img_offset == |
2421 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
90e98c52 | 2422 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2423 | pages = data_desc; |
2424 | } | |
2425 | ||
bf0d5f50 | 2426 | while (resid) { |
2fa12320 | 2427 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2428 | const char *object_name; |
bf0d5f50 AE |
2429 | u64 offset; |
2430 | u64 length; | |
2431 | ||
7da22d29 | 2432 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2433 | if (!object_name) |
2434 | goto out_unwind; | |
7da22d29 AE |
2435 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2436 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2437 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2438 | offset, length, type); |
78c2a44a AE |
2439 | /* object request has its own copy of the object name */ |
2440 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2441 | if (!obj_request) |
2442 | goto out_unwind; | |
62054da6 | 2443 | |
03507db6 JD |
2444 | /* |
2445 | * set obj_request->img_request before creating the | |
2446 | * osd_request so that it gets the right snapc | |
2447 | */ | |
2448 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2449 | |
f1a4739f AE |
2450 | if (type == OBJ_REQUEST_BIO) { |
2451 | unsigned int clone_size; | |
2452 | ||
2453 | rbd_assert(length <= (u64)UINT_MAX); | |
2454 | clone_size = (unsigned int)length; | |
2455 | obj_request->bio_list = | |
2456 | bio_chain_clone_range(&bio_list, | |
2457 | &bio_offset, | |
2458 | clone_size, | |
2459 | GFP_ATOMIC); | |
2460 | if (!obj_request->bio_list) | |
62054da6 | 2461 | goto out_unwind; |
90e98c52 | 2462 | } else if (type == OBJ_REQUEST_PAGES) { |
f1a4739f AE |
2463 | unsigned int page_count; |
2464 | ||
2465 | obj_request->pages = pages; | |
2466 | page_count = (u32)calc_pages_for(offset, length); | |
2467 | obj_request->page_count = page_count; | |
2468 | if ((offset + length) & ~PAGE_MASK) | |
2469 | page_count--; /* more on last page */ | |
2470 | pages += page_count; | |
2471 | } | |
bf0d5f50 | 2472 | |
6d2940c8 GZ |
2473 | osd_req = rbd_osd_req_create(rbd_dev, op_type, |
2474 | (op_type == OBJ_OP_WRITE) ? 2 : 1, | |
2475 | obj_request); | |
2fa12320 | 2476 | if (!osd_req) |
62054da6 | 2477 | goto out_unwind; |
3b434a2a | 2478 | |
2fa12320 | 2479 | obj_request->osd_req = osd_req; |
2169238d | 2480 | obj_request->callback = rbd_img_obj_callback; |
3b434a2a | 2481 | obj_request->img_offset = img_offset; |
9d4df01f | 2482 | |
3b434a2a | 2483 | rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
430c28c3 | 2484 | |
3b434a2a | 2485 | rbd_img_request_get(img_request); |
bf0d5f50 | 2486 | |
7da22d29 | 2487 | img_offset += length; |
bf0d5f50 AE |
2488 | resid -= length; |
2489 | } | |
2490 | ||
2491 | return 0; | |
2492 | ||
bf0d5f50 AE |
2493 | out_unwind: |
2494 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2495 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2496 | |
2497 | return -ENOMEM; | |
2498 | } | |
2499 | ||
0eefd470 AE |
2500 | static void |
2501 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2502 | { | |
2503 | struct rbd_img_request *img_request; | |
2504 | struct rbd_device *rbd_dev; | |
ebda6408 | 2505 | struct page **pages; |
0eefd470 AE |
2506 | u32 page_count; |
2507 | ||
d3246fb0 JD |
2508 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
2509 | obj_request->type == OBJ_REQUEST_NODATA); | |
0eefd470 AE |
2510 | rbd_assert(obj_request_img_data_test(obj_request)); |
2511 | img_request = obj_request->img_request; | |
2512 | rbd_assert(img_request); | |
2513 | ||
2514 | rbd_dev = img_request->rbd_dev; | |
2515 | rbd_assert(rbd_dev); | |
0eefd470 | 2516 | |
ebda6408 AE |
2517 | pages = obj_request->copyup_pages; |
2518 | rbd_assert(pages != NULL); | |
0eefd470 | 2519 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2520 | page_count = obj_request->copyup_page_count; |
2521 | rbd_assert(page_count); | |
2522 | obj_request->copyup_page_count = 0; | |
2523 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2524 | |
2525 | /* | |
2526 | * We want the transfer count to reflect the size of the | |
2527 | * original write request. There is no such thing as a | |
2528 | * successful short write, so if the request was successful | |
2529 | * we can just set it to the originally-requested length. | |
2530 | */ | |
2531 | if (!obj_request->result) | |
2532 | obj_request->xferred = obj_request->length; | |
2533 | ||
2534 | /* Finish up with the normal image object callback */ | |
2535 | ||
2536 | rbd_img_obj_callback(obj_request); | |
2537 | } | |
2538 | ||
3d7efd18 AE |
2539 | static void |
2540 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2541 | { | |
2542 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2543 | struct ceph_osd_request *osd_req; |
2544 | struct ceph_osd_client *osdc; | |
2545 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2546 | struct page **pages; |
d3246fb0 | 2547 | enum obj_operation_type op_type; |
ebda6408 | 2548 | u32 page_count; |
bbea1c1a | 2549 | int img_result; |
ebda6408 | 2550 | u64 parent_length; |
3d7efd18 AE |
2551 | |
2552 | rbd_assert(img_request_child_test(img_request)); | |
2553 | ||
2554 | /* First get what we need from the image request */ | |
2555 | ||
2556 | pages = img_request->copyup_pages; | |
2557 | rbd_assert(pages != NULL); | |
2558 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2559 | page_count = img_request->copyup_page_count; |
2560 | rbd_assert(page_count); | |
2561 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2562 | |
2563 | orig_request = img_request->obj_request; | |
2564 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2565 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2566 | img_result = img_request->result; |
ebda6408 AE |
2567 | parent_length = img_request->length; |
2568 | rbd_assert(parent_length == img_request->xferred); | |
91c6febb | 2569 | rbd_img_request_put(img_request); |
3d7efd18 | 2570 | |
91c6febb AE |
2571 | rbd_assert(orig_request->img_request); |
2572 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2573 | rbd_assert(rbd_dev); |
0eefd470 | 2574 | |
bbea1c1a AE |
2575 | /* |
2576 | * If the overlap has become 0 (most likely because the | |
2577 | * image has been flattened) we need to free the pages | |
2578 | * and re-submit the original write request. | |
2579 | */ | |
2580 | if (!rbd_dev->parent_overlap) { | |
2581 | struct ceph_osd_client *osdc; | |
3d7efd18 | 2582 | |
bbea1c1a AE |
2583 | ceph_release_page_vector(pages, page_count); |
2584 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2585 | img_result = rbd_obj_request_submit(osdc, orig_request); | |
2586 | if (!img_result) | |
2587 | return; | |
2588 | } | |
0eefd470 | 2589 | |
bbea1c1a | 2590 | if (img_result) |
0eefd470 | 2591 | goto out_err; |
0eefd470 | 2592 | |
8785b1d4 AE |
2593 | /* |
2594 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2595 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2596 | * request. Allocate the new copyup osd request for the |
2597 | * original request, and release the old one. | |
2598 | */ | |
bbea1c1a | 2599 | img_result = -ENOMEM; |
0eefd470 AE |
2600 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2601 | if (!osd_req) | |
2602 | goto out_err; | |
8785b1d4 | 2603 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2604 | orig_request->osd_req = osd_req; |
2605 | orig_request->copyup_pages = pages; | |
ebda6408 | 2606 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2607 | |
0eefd470 | 2608 | /* Initialize the copyup op */ |
3d7efd18 | 2609 | |
0eefd470 | 2610 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2611 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2612 | false, false); |
3d7efd18 | 2613 | |
d3246fb0 | 2614 | /* Add the other op(s) */ |
0eefd470 | 2615 | |
d3246fb0 JD |
2616 | op_type = rbd_img_request_op_type(orig_request->img_request); |
2617 | rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); | |
0eefd470 AE |
2618 | |
2619 | /* All set, send it off. */ | |
2620 | ||
2621 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2622 | osdc = &rbd_dev->rbd_client->client->osdc; | |
bbea1c1a AE |
2623 | img_result = rbd_obj_request_submit(osdc, orig_request); |
2624 | if (!img_result) | |
0eefd470 AE |
2625 | return; |
2626 | out_err: | |
2627 | /* Record the error code and complete the request */ | |
2628 | ||
bbea1c1a | 2629 | orig_request->result = img_result; |
0eefd470 AE |
2630 | orig_request->xferred = 0; |
2631 | obj_request_done_set(orig_request); | |
2632 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2633 | } |
2634 | ||
2635 | /* | |
2636 | * Read from the parent image the range of data that covers the | |
2637 | * entire target of the given object request. This is used for | |
2638 | * satisfying a layered image write request when the target of an | |
2639 | * object request from the image request does not exist. | |
2640 | * | |
2641 | * A page array big enough to hold the returned data is allocated | |
2642 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2643 | * When the read completes, this page array will be transferred to | |
2644 | * the original object request for the copyup operation. | |
2645 | * | |
2646 | * If an error occurs, record it as the result of the original | |
2647 | * object request and mark it done so it gets completed. | |
2648 | */ | |
2649 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2650 | { | |
2651 | struct rbd_img_request *img_request = NULL; | |
2652 | struct rbd_img_request *parent_request = NULL; | |
2653 | struct rbd_device *rbd_dev; | |
2654 | u64 img_offset; | |
2655 | u64 length; | |
2656 | struct page **pages = NULL; | |
2657 | u32 page_count; | |
2658 | int result; | |
2659 | ||
2660 | rbd_assert(obj_request_img_data_test(obj_request)); | |
b91f09f1 | 2661 | rbd_assert(obj_request_type_valid(obj_request->type)); |
3d7efd18 AE |
2662 | |
2663 | img_request = obj_request->img_request; | |
2664 | rbd_assert(img_request != NULL); | |
2665 | rbd_dev = img_request->rbd_dev; | |
2666 | rbd_assert(rbd_dev->parent != NULL); | |
2667 | ||
2668 | /* | |
2669 | * Determine the byte range covered by the object in the | |
2670 | * child image to which the original request was to be sent. | |
2671 | */ | |
2672 | img_offset = obj_request->img_offset - obj_request->offset; | |
2673 | length = (u64)1 << rbd_dev->header.obj_order; | |
2674 | ||
a9e8ba2c AE |
2675 | /* |
2676 | * There is no defined parent data beyond the parent | |
2677 | * overlap, so limit what we read at that boundary if | |
2678 | * necessary. | |
2679 | */ | |
2680 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2681 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2682 | length = rbd_dev->parent_overlap - img_offset; | |
2683 | } | |
2684 | ||
3d7efd18 AE |
2685 | /* |
2686 | * Allocate a page array big enough to receive the data read | |
2687 | * from the parent. | |
2688 | */ | |
2689 | page_count = (u32)calc_pages_for(0, length); | |
2690 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2691 | if (IS_ERR(pages)) { | |
2692 | result = PTR_ERR(pages); | |
2693 | pages = NULL; | |
2694 | goto out_err; | |
2695 | } | |
2696 | ||
2697 | result = -ENOMEM; | |
e93f3152 AE |
2698 | parent_request = rbd_parent_request_create(obj_request, |
2699 | img_offset, length); | |
3d7efd18 AE |
2700 | if (!parent_request) |
2701 | goto out_err; | |
3d7efd18 AE |
2702 | |
2703 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2704 | if (result) | |
2705 | goto out_err; | |
2706 | parent_request->copyup_pages = pages; | |
ebda6408 | 2707 | parent_request->copyup_page_count = page_count; |
3d7efd18 AE |
2708 | |
2709 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2710 | result = rbd_img_request_submit(parent_request); | |
2711 | if (!result) | |
2712 | return 0; | |
2713 | ||
2714 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2715 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2716 | parent_request->obj_request = NULL; |
2717 | rbd_obj_request_put(obj_request); | |
2718 | out_err: | |
2719 | if (pages) | |
2720 | ceph_release_page_vector(pages, page_count); | |
2721 | if (parent_request) | |
2722 | rbd_img_request_put(parent_request); | |
2723 | obj_request->result = result; | |
2724 | obj_request->xferred = 0; | |
2725 | obj_request_done_set(obj_request); | |
2726 | ||
2727 | return result; | |
2728 | } | |
2729 | ||
c5b5ef6c AE |
2730 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2731 | { | |
c5b5ef6c | 2732 | struct rbd_obj_request *orig_request; |
638f5abe | 2733 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2734 | int result; |
2735 | ||
2736 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2737 | ||
2738 | /* | |
2739 | * All we need from the object request is the original | |
2740 | * request and the result of the STAT op. Grab those, then | |
2741 | * we're done with the request. | |
2742 | */ | |
2743 | orig_request = obj_request->obj_request; | |
2744 | obj_request->obj_request = NULL; | |
912c317d | 2745 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2746 | rbd_assert(orig_request); |
2747 | rbd_assert(orig_request->img_request); | |
2748 | ||
2749 | result = obj_request->result; | |
2750 | obj_request->result = 0; | |
2751 | ||
2752 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2753 | obj_request, orig_request, result, | |
2754 | obj_request->xferred, obj_request->length); | |
2755 | rbd_obj_request_put(obj_request); | |
2756 | ||
638f5abe AE |
2757 | /* |
2758 | * If the overlap has become 0 (most likely because the | |
2759 | * image has been flattened) we need to free the pages | |
2760 | * and re-submit the original write request. | |
2761 | */ | |
2762 | rbd_dev = orig_request->img_request->rbd_dev; | |
2763 | if (!rbd_dev->parent_overlap) { | |
2764 | struct ceph_osd_client *osdc; | |
2765 | ||
638f5abe AE |
2766 | osdc = &rbd_dev->rbd_client->client->osdc; |
2767 | result = rbd_obj_request_submit(osdc, orig_request); | |
2768 | if (!result) | |
2769 | return; | |
2770 | } | |
c5b5ef6c AE |
2771 | |
2772 | /* | |
2773 | * Our only purpose here is to determine whether the object | |
2774 | * exists, and we don't want to treat the non-existence as | |
2775 | * an error. If something else comes back, transfer the | |
2776 | * error to the original request and complete it now. | |
2777 | */ | |
2778 | if (!result) { | |
2779 | obj_request_existence_set(orig_request, true); | |
2780 | } else if (result == -ENOENT) { | |
2781 | obj_request_existence_set(orig_request, false); | |
2782 | } else if (result) { | |
2783 | orig_request->result = result; | |
3d7efd18 | 2784 | goto out; |
c5b5ef6c AE |
2785 | } |
2786 | ||
2787 | /* | |
2788 | * Resubmit the original request now that we have recorded | |
2789 | * whether the target object exists. | |
2790 | */ | |
b454e36d | 2791 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2792 | out: |
c5b5ef6c AE |
2793 | if (orig_request->result) |
2794 | rbd_obj_request_complete(orig_request); | |
c5b5ef6c AE |
2795 | } |
2796 | ||
2797 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2798 | { | |
2799 | struct rbd_obj_request *stat_request; | |
2800 | struct rbd_device *rbd_dev; | |
2801 | struct ceph_osd_client *osdc; | |
2802 | struct page **pages = NULL; | |
2803 | u32 page_count; | |
2804 | size_t size; | |
2805 | int ret; | |
2806 | ||
2807 | /* | |
2808 | * The response data for a STAT call consists of: | |
2809 | * le64 length; | |
2810 | * struct { | |
2811 | * le32 tv_sec; | |
2812 | * le32 tv_nsec; | |
2813 | * } mtime; | |
2814 | */ | |
2815 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2816 | page_count = (u32)calc_pages_for(0, size); | |
2817 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2818 | if (IS_ERR(pages)) | |
2819 | return PTR_ERR(pages); | |
2820 | ||
2821 | ret = -ENOMEM; | |
2822 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2823 | OBJ_REQUEST_PAGES); | |
2824 | if (!stat_request) | |
2825 | goto out; | |
2826 | ||
2827 | rbd_obj_request_get(obj_request); | |
2828 | stat_request->obj_request = obj_request; | |
2829 | stat_request->pages = pages; | |
2830 | stat_request->page_count = page_count; | |
2831 | ||
2832 | rbd_assert(obj_request->img_request); | |
2833 | rbd_dev = obj_request->img_request->rbd_dev; | |
6d2940c8 | 2834 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 2835 | stat_request); |
c5b5ef6c AE |
2836 | if (!stat_request->osd_req) |
2837 | goto out; | |
2838 | stat_request->callback = rbd_img_obj_exists_callback; | |
2839 | ||
2840 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2841 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2842 | false, false); | |
9d4df01f | 2843 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2844 | |
2845 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2846 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2847 | out: | |
2848 | if (ret) | |
2849 | rbd_obj_request_put(obj_request); | |
2850 | ||
2851 | return ret; | |
2852 | } | |
2853 | ||
70d045f6 | 2854 | static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
b454e36d AE |
2855 | { |
2856 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2857 | struct rbd_device *rbd_dev; |
b454e36d AE |
2858 | |
2859 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2860 | ||
2861 | img_request = obj_request->img_request; | |
2862 | rbd_assert(img_request); | |
a9e8ba2c | 2863 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2864 | |
70d045f6 | 2865 | /* Reads */ |
1c220881 JD |
2866 | if (!img_request_write_test(img_request) && |
2867 | !img_request_discard_test(img_request)) | |
70d045f6 ID |
2868 | return true; |
2869 | ||
2870 | /* Non-layered writes */ | |
2871 | if (!img_request_layered_test(img_request)) | |
2872 | return true; | |
2873 | ||
b454e36d | 2874 | /* |
70d045f6 ID |
2875 | * Layered writes outside of the parent overlap range don't |
2876 | * share any data with the parent. | |
b454e36d | 2877 | */ |
70d045f6 ID |
2878 | if (!obj_request_overlaps_parent(obj_request)) |
2879 | return true; | |
b454e36d | 2880 | |
c622d226 GZ |
2881 | /* |
2882 | * Entire-object layered writes - we will overwrite whatever | |
2883 | * parent data there is anyway. | |
2884 | */ | |
2885 | if (!obj_request->offset && | |
2886 | obj_request->length == rbd_obj_bytes(&rbd_dev->header)) | |
2887 | return true; | |
2888 | ||
70d045f6 ID |
2889 | /* |
2890 | * If the object is known to already exist, its parent data has | |
2891 | * already been copied. | |
2892 | */ | |
2893 | if (obj_request_known_test(obj_request) && | |
2894 | obj_request_exists_test(obj_request)) | |
2895 | return true; | |
2896 | ||
2897 | return false; | |
2898 | } | |
2899 | ||
2900 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) | |
2901 | { | |
2902 | if (img_obj_request_simple(obj_request)) { | |
b454e36d AE |
2903 | struct rbd_device *rbd_dev; |
2904 | struct ceph_osd_client *osdc; | |
2905 | ||
2906 | rbd_dev = obj_request->img_request->rbd_dev; | |
2907 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2908 | ||
2909 | return rbd_obj_request_submit(osdc, obj_request); | |
2910 | } | |
2911 | ||
2912 | /* | |
3d7efd18 AE |
2913 | * It's a layered write. The target object might exist but |
2914 | * we may not know that yet. If we know it doesn't exist, | |
2915 | * start by reading the data for the full target object from | |
2916 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2917 | */ |
70d045f6 | 2918 | if (obj_request_known_test(obj_request)) |
3d7efd18 AE |
2919 | return rbd_img_obj_parent_read_full(obj_request); |
2920 | ||
2921 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2922 | |
2923 | return rbd_img_obj_exists_submit(obj_request); | |
2924 | } | |
2925 | ||
bf0d5f50 AE |
2926 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2927 | { | |
bf0d5f50 | 2928 | struct rbd_obj_request *obj_request; |
46faeed4 | 2929 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2930 | |
37206ee5 | 2931 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2932 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2933 | int ret; |
2934 | ||
b454e36d | 2935 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2936 | if (ret) |
2937 | return ret; | |
bf0d5f50 AE |
2938 | } |
2939 | ||
2940 | return 0; | |
2941 | } | |
8b3e1a56 AE |
2942 | |
2943 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2944 | { | |
2945 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2946 | struct rbd_device *rbd_dev; |
2947 | u64 obj_end; | |
02c74fba AE |
2948 | u64 img_xferred; |
2949 | int img_result; | |
8b3e1a56 AE |
2950 | |
2951 | rbd_assert(img_request_child_test(img_request)); | |
2952 | ||
02c74fba AE |
2953 | /* First get what we need from the image request and release it */ |
2954 | ||
8b3e1a56 | 2955 | obj_request = img_request->obj_request; |
02c74fba AE |
2956 | img_xferred = img_request->xferred; |
2957 | img_result = img_request->result; | |
2958 | rbd_img_request_put(img_request); | |
2959 | ||
2960 | /* | |
2961 | * If the overlap has become 0 (most likely because the | |
2962 | * image has been flattened) we need to re-submit the | |
2963 | * original request. | |
2964 | */ | |
a9e8ba2c AE |
2965 | rbd_assert(obj_request); |
2966 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
2967 | rbd_dev = obj_request->img_request->rbd_dev; |
2968 | if (!rbd_dev->parent_overlap) { | |
2969 | struct ceph_osd_client *osdc; | |
2970 | ||
2971 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2972 | img_result = rbd_obj_request_submit(osdc, obj_request); | |
2973 | if (!img_result) | |
2974 | return; | |
2975 | } | |
a9e8ba2c | 2976 | |
02c74fba | 2977 | obj_request->result = img_result; |
a9e8ba2c AE |
2978 | if (obj_request->result) |
2979 | goto out; | |
2980 | ||
2981 | /* | |
2982 | * We need to zero anything beyond the parent overlap | |
2983 | * boundary. Since rbd_img_obj_request_read_callback() | |
2984 | * will zero anything beyond the end of a short read, an | |
2985 | * easy way to do this is to pretend the data from the | |
2986 | * parent came up short--ending at the overlap boundary. | |
2987 | */ | |
2988 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2989 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
2990 | if (obj_end > rbd_dev->parent_overlap) { |
2991 | u64 xferred = 0; | |
2992 | ||
2993 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2994 | xferred = rbd_dev->parent_overlap - | |
2995 | obj_request->img_offset; | |
8b3e1a56 | 2996 | |
02c74fba | 2997 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 2998 | } else { |
02c74fba | 2999 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
3000 | } |
3001 | out: | |
8b3e1a56 AE |
3002 | rbd_img_obj_request_read_callback(obj_request); |
3003 | rbd_obj_request_complete(obj_request); | |
3004 | } | |
3005 | ||
3006 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
3007 | { | |
8b3e1a56 AE |
3008 | struct rbd_img_request *img_request; |
3009 | int result; | |
3010 | ||
3011 | rbd_assert(obj_request_img_data_test(obj_request)); | |
3012 | rbd_assert(obj_request->img_request != NULL); | |
3013 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 3014 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 3015 | |
8b3e1a56 | 3016 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 3017 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 3018 | obj_request->img_offset, |
e93f3152 | 3019 | obj_request->length); |
8b3e1a56 AE |
3020 | result = -ENOMEM; |
3021 | if (!img_request) | |
3022 | goto out_err; | |
3023 | ||
5b2ab72d AE |
3024 | if (obj_request->type == OBJ_REQUEST_BIO) |
3025 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
3026 | obj_request->bio_list); | |
3027 | else | |
3028 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
3029 | obj_request->pages); | |
8b3e1a56 AE |
3030 | if (result) |
3031 | goto out_err; | |
3032 | ||
3033 | img_request->callback = rbd_img_parent_read_callback; | |
3034 | result = rbd_img_request_submit(img_request); | |
3035 | if (result) | |
3036 | goto out_err; | |
3037 | ||
3038 | return; | |
3039 | out_err: | |
3040 | if (img_request) | |
3041 | rbd_img_request_put(img_request); | |
3042 | obj_request->result = result; | |
3043 | obj_request->xferred = 0; | |
3044 | obj_request_done_set(obj_request); | |
3045 | } | |
bf0d5f50 | 3046 | |
20e0af67 | 3047 | static int rbd_obj_notify_ack_sync(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
3048 | { |
3049 | struct rbd_obj_request *obj_request; | |
2169238d | 3050 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
3051 | int ret; |
3052 | ||
3053 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
3054 | OBJ_REQUEST_NODATA); | |
3055 | if (!obj_request) | |
3056 | return -ENOMEM; | |
3057 | ||
3058 | ret = -ENOMEM; | |
6d2940c8 | 3059 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 3060 | obj_request); |
b8d70035 AE |
3061 | if (!obj_request->osd_req) |
3062 | goto out; | |
3063 | ||
c99d2d4a | 3064 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 3065 | notify_id, 0, 0); |
9d4df01f | 3066 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3067 | |
b8d70035 | 3068 | ret = rbd_obj_request_submit(osdc, obj_request); |
cf81b60e | 3069 | if (ret) |
20e0af67 JD |
3070 | goto out; |
3071 | ret = rbd_obj_request_wait(obj_request); | |
3072 | out: | |
3073 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
3074 | |
3075 | return ret; | |
3076 | } | |
3077 | ||
3078 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
3079 | { | |
3080 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
e627db08 | 3081 | int ret; |
b8d70035 AE |
3082 | |
3083 | if (!rbd_dev) | |
3084 | return; | |
3085 | ||
37206ee5 | 3086 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
3087 | rbd_dev->header_name, (unsigned long long)notify_id, |
3088 | (unsigned int)opcode); | |
52bb1f9b ID |
3089 | |
3090 | /* | |
3091 | * Until adequate refresh error handling is in place, there is | |
3092 | * not much we can do here, except warn. | |
3093 | * | |
3094 | * See http://tracker.ceph.com/issues/5040 | |
3095 | */ | |
e627db08 AE |
3096 | ret = rbd_dev_refresh(rbd_dev); |
3097 | if (ret) | |
9584d508 | 3098 | rbd_warn(rbd_dev, "refresh failed: %d", ret); |
b8d70035 | 3099 | |
52bb1f9b ID |
3100 | ret = rbd_obj_notify_ack_sync(rbd_dev, notify_id); |
3101 | if (ret) | |
9584d508 | 3102 | rbd_warn(rbd_dev, "notify_ack ret %d", ret); |
b8d70035 AE |
3103 | } |
3104 | ||
bb040aa0 ID |
3105 | /* |
3106 | * Send a (un)watch request and wait for the ack. Return a request | |
3107 | * with a ref held on success or error. | |
3108 | */ | |
3109 | static struct rbd_obj_request *rbd_obj_watch_request_helper( | |
3110 | struct rbd_device *rbd_dev, | |
3111 | bool watch) | |
3112 | { | |
3113 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3114 | struct rbd_obj_request *obj_request; | |
3115 | int ret; | |
3116 | ||
3117 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
3118 | OBJ_REQUEST_NODATA); | |
3119 | if (!obj_request) | |
3120 | return ERR_PTR(-ENOMEM); | |
3121 | ||
6d2940c8 | 3122 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_WRITE, 1, |
bb040aa0 ID |
3123 | obj_request); |
3124 | if (!obj_request->osd_req) { | |
3125 | ret = -ENOMEM; | |
3126 | goto out; | |
3127 | } | |
3128 | ||
3129 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
3130 | rbd_dev->watch_event->cookie, 0, watch); | |
3131 | rbd_osd_req_format_write(obj_request); | |
3132 | ||
3133 | if (watch) | |
3134 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); | |
3135 | ||
3136 | ret = rbd_obj_request_submit(osdc, obj_request); | |
3137 | if (ret) | |
3138 | goto out; | |
3139 | ||
3140 | ret = rbd_obj_request_wait(obj_request); | |
3141 | if (ret) | |
3142 | goto out; | |
3143 | ||
3144 | ret = obj_request->result; | |
3145 | if (ret) { | |
3146 | if (watch) | |
3147 | rbd_obj_request_end(obj_request); | |
3148 | goto out; | |
3149 | } | |
3150 | ||
3151 | return obj_request; | |
3152 | ||
3153 | out: | |
3154 | rbd_obj_request_put(obj_request); | |
3155 | return ERR_PTR(ret); | |
3156 | } | |
3157 | ||
9969ebc5 | 3158 | /* |
b30a01f2 | 3159 | * Initiate a watch request, synchronously. |
9969ebc5 | 3160 | */ |
b30a01f2 | 3161 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3162 | { |
3163 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3164 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
3165 | int ret; |
3166 | ||
b30a01f2 ID |
3167 | rbd_assert(!rbd_dev->watch_event); |
3168 | rbd_assert(!rbd_dev->watch_request); | |
9969ebc5 | 3169 | |
b30a01f2 ID |
3170 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
3171 | &rbd_dev->watch_event); | |
3172 | if (ret < 0) | |
3173 | return ret; | |
3174 | ||
76756a51 ID |
3175 | obj_request = rbd_obj_watch_request_helper(rbd_dev, true); |
3176 | if (IS_ERR(obj_request)) { | |
3177 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
3178 | rbd_dev->watch_event = NULL; | |
3179 | return PTR_ERR(obj_request); | |
b30a01f2 | 3180 | } |
9969ebc5 | 3181 | |
8eb87565 AE |
3182 | /* |
3183 | * A watch request is set to linger, so the underlying osd | |
3184 | * request won't go away until we unregister it. We retain | |
3185 | * a pointer to the object request during that time (in | |
76756a51 ID |
3186 | * rbd_dev->watch_request), so we'll keep a reference to it. |
3187 | * We'll drop that reference after we've unregistered it in | |
3188 | * rbd_dev_header_unwatch_sync(). | |
8eb87565 | 3189 | */ |
b30a01f2 | 3190 | rbd_dev->watch_request = obj_request; |
8eb87565 | 3191 | |
b30a01f2 | 3192 | return 0; |
b30a01f2 ID |
3193 | } |
3194 | ||
3195 | /* | |
3196 | * Tear down a watch request, synchronously. | |
3197 | */ | |
76756a51 | 3198 | static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev) |
b30a01f2 | 3199 | { |
b30a01f2 | 3200 | struct rbd_obj_request *obj_request; |
b30a01f2 ID |
3201 | |
3202 | rbd_assert(rbd_dev->watch_event); | |
3203 | rbd_assert(rbd_dev->watch_request); | |
3204 | ||
76756a51 | 3205 | rbd_obj_request_end(rbd_dev->watch_request); |
8eb87565 AE |
3206 | rbd_obj_request_put(rbd_dev->watch_request); |
3207 | rbd_dev->watch_request = NULL; | |
b30a01f2 | 3208 | |
76756a51 ID |
3209 | obj_request = rbd_obj_watch_request_helper(rbd_dev, false); |
3210 | if (!IS_ERR(obj_request)) | |
3211 | rbd_obj_request_put(obj_request); | |
3212 | else | |
3213 | rbd_warn(rbd_dev, "unable to tear down watch request (%ld)", | |
3214 | PTR_ERR(obj_request)); | |
3215 | ||
9969ebc5 AE |
3216 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
3217 | rbd_dev->watch_event = NULL; | |
fca27065 ID |
3218 | } |
3219 | ||
36be9a76 | 3220 | /* |
f40eb349 AE |
3221 | * Synchronous osd object method call. Returns the number of bytes |
3222 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3223 | */ |
3224 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
3225 | const char *object_name, | |
3226 | const char *class_name, | |
3227 | const char *method_name, | |
4157976b | 3228 | const void *outbound, |
36be9a76 | 3229 | size_t outbound_size, |
4157976b | 3230 | void *inbound, |
e2a58ee5 | 3231 | size_t inbound_size) |
36be9a76 | 3232 | { |
2169238d | 3233 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 3234 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
3235 | struct page **pages; |
3236 | u32 page_count; | |
3237 | int ret; | |
3238 | ||
3239 | /* | |
6010a451 AE |
3240 | * Method calls are ultimately read operations. The result |
3241 | * should placed into the inbound buffer provided. They | |
3242 | * also supply outbound data--parameters for the object | |
3243 | * method. Currently if this is present it will be a | |
3244 | * snapshot id. | |
36be9a76 | 3245 | */ |
57385b51 | 3246 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
3247 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
3248 | if (IS_ERR(pages)) | |
3249 | return PTR_ERR(pages); | |
3250 | ||
3251 | ret = -ENOMEM; | |
6010a451 | 3252 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
3253 | OBJ_REQUEST_PAGES); |
3254 | if (!obj_request) | |
3255 | goto out; | |
3256 | ||
3257 | obj_request->pages = pages; | |
3258 | obj_request->page_count = page_count; | |
3259 | ||
6d2940c8 | 3260 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 3261 | obj_request); |
36be9a76 AE |
3262 | if (!obj_request->osd_req) |
3263 | goto out; | |
3264 | ||
c99d2d4a | 3265 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
3266 | class_name, method_name); |
3267 | if (outbound_size) { | |
3268 | struct ceph_pagelist *pagelist; | |
3269 | ||
3270 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
3271 | if (!pagelist) | |
3272 | goto out; | |
3273 | ||
3274 | ceph_pagelist_init(pagelist); | |
3275 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
3276 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
3277 | pagelist); | |
3278 | } | |
a4ce40a9 AE |
3279 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
3280 | obj_request->pages, inbound_size, | |
44cd188d | 3281 | 0, false, false); |
9d4df01f | 3282 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3283 | |
36be9a76 AE |
3284 | ret = rbd_obj_request_submit(osdc, obj_request); |
3285 | if (ret) | |
3286 | goto out; | |
3287 | ret = rbd_obj_request_wait(obj_request); | |
3288 | if (ret) | |
3289 | goto out; | |
3290 | ||
3291 | ret = obj_request->result; | |
3292 | if (ret < 0) | |
3293 | goto out; | |
57385b51 AE |
3294 | |
3295 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
3296 | ret = (int)obj_request->xferred; | |
903bb32e | 3297 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
3298 | out: |
3299 | if (obj_request) | |
3300 | rbd_obj_request_put(obj_request); | |
3301 | else | |
3302 | ceph_release_page_vector(pages, page_count); | |
3303 | ||
3304 | return ret; | |
3305 | } | |
3306 | ||
bc1ecc65 | 3307 | static void rbd_handle_request(struct rbd_device *rbd_dev, struct request *rq) |
bf0d5f50 | 3308 | { |
bc1ecc65 | 3309 | struct rbd_img_request *img_request; |
4e752f0a | 3310 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3311 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3312 | u64 length = blk_rq_bytes(rq); | |
6d2940c8 | 3313 | enum obj_operation_type op_type; |
4e752f0a | 3314 | u64 mapping_size; |
bf0d5f50 AE |
3315 | int result; |
3316 | ||
90e98c52 GZ |
3317 | if (rq->cmd_flags & REQ_DISCARD) |
3318 | op_type = OBJ_OP_DISCARD; | |
3319 | else if (rq->cmd_flags & REQ_WRITE) | |
6d2940c8 GZ |
3320 | op_type = OBJ_OP_WRITE; |
3321 | else | |
3322 | op_type = OBJ_OP_READ; | |
3323 | ||
bc1ecc65 | 3324 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3325 | |
bc1ecc65 ID |
3326 | if (!length) { |
3327 | dout("%s: zero-length request\n", __func__); | |
3328 | result = 0; | |
3329 | goto err_rq; | |
3330 | } | |
bf0d5f50 | 3331 | |
6d2940c8 | 3332 | /* Only reads are allowed to a read-only device */ |
bc1ecc65 | 3333 | |
6d2940c8 | 3334 | if (op_type != OBJ_OP_READ) { |
bc1ecc65 ID |
3335 | if (rbd_dev->mapping.read_only) { |
3336 | result = -EROFS; | |
3337 | goto err_rq; | |
4dda41d3 | 3338 | } |
bc1ecc65 ID |
3339 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
3340 | } | |
4dda41d3 | 3341 | |
bc1ecc65 ID |
3342 | /* |
3343 | * Quit early if the mapped snapshot no longer exists. It's | |
3344 | * still possible the snapshot will have disappeared by the | |
3345 | * time our request arrives at the osd, but there's no sense in | |
3346 | * sending it if we already know. | |
3347 | */ | |
3348 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3349 | dout("request for non-existent snapshot"); | |
3350 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3351 | result = -ENXIO; | |
3352 | goto err_rq; | |
3353 | } | |
4dda41d3 | 3354 | |
bc1ecc65 ID |
3355 | if (offset && length > U64_MAX - offset + 1) { |
3356 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3357 | length); | |
3358 | result = -EINVAL; | |
3359 | goto err_rq; /* Shouldn't happen */ | |
3360 | } | |
4dda41d3 | 3361 | |
4e752f0a JD |
3362 | down_read(&rbd_dev->header_rwsem); |
3363 | mapping_size = rbd_dev->mapping.size; | |
6d2940c8 | 3364 | if (op_type != OBJ_OP_READ) { |
4e752f0a JD |
3365 | snapc = rbd_dev->header.snapc; |
3366 | ceph_get_snap_context(snapc); | |
3367 | } | |
3368 | up_read(&rbd_dev->header_rwsem); | |
3369 | ||
3370 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3371 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3372 | length, mapping_size); |
bc1ecc65 ID |
3373 | result = -EIO; |
3374 | goto err_rq; | |
3375 | } | |
bf0d5f50 | 3376 | |
6d2940c8 | 3377 | img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
4e752f0a | 3378 | snapc); |
bc1ecc65 ID |
3379 | if (!img_request) { |
3380 | result = -ENOMEM; | |
3381 | goto err_rq; | |
3382 | } | |
3383 | img_request->rq = rq; | |
bf0d5f50 | 3384 | |
90e98c52 GZ |
3385 | if (op_type == OBJ_OP_DISCARD) |
3386 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, | |
3387 | NULL); | |
3388 | else | |
3389 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
3390 | rq->bio); | |
bc1ecc65 ID |
3391 | if (result) |
3392 | goto err_img_request; | |
bf0d5f50 | 3393 | |
bc1ecc65 ID |
3394 | result = rbd_img_request_submit(img_request); |
3395 | if (result) | |
3396 | goto err_img_request; | |
bf0d5f50 | 3397 | |
bc1ecc65 | 3398 | return; |
bf0d5f50 | 3399 | |
bc1ecc65 ID |
3400 | err_img_request: |
3401 | rbd_img_request_put(img_request); | |
3402 | err_rq: | |
3403 | if (result) | |
3404 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
6d2940c8 | 3405 | obj_op_name(op_type), length, offset, result); |
e96a650a | 3406 | ceph_put_snap_context(snapc); |
bc1ecc65 ID |
3407 | blk_end_request_all(rq, result); |
3408 | } | |
bf0d5f50 | 3409 | |
bc1ecc65 ID |
3410 | static void rbd_request_workfn(struct work_struct *work) |
3411 | { | |
3412 | struct rbd_device *rbd_dev = | |
3413 | container_of(work, struct rbd_device, rq_work); | |
3414 | struct request *rq, *next; | |
3415 | LIST_HEAD(requests); | |
00a653e2 | 3416 | |
bc1ecc65 ID |
3417 | spin_lock_irq(&rbd_dev->lock); /* rq->q->queue_lock */ |
3418 | list_splice_init(&rbd_dev->rq_queue, &requests); | |
3419 | spin_unlock_irq(&rbd_dev->lock); | |
bf0d5f50 | 3420 | |
bc1ecc65 ID |
3421 | list_for_each_entry_safe(rq, next, &requests, queuelist) { |
3422 | list_del_init(&rq->queuelist); | |
3423 | rbd_handle_request(rbd_dev, rq); | |
3424 | } | |
3425 | } | |
bf0d5f50 | 3426 | |
bc1ecc65 ID |
3427 | /* |
3428 | * Called with q->queue_lock held and interrupts disabled, possibly on | |
3429 | * the way to schedule(). Do not sleep here! | |
3430 | */ | |
3431 | static void rbd_request_fn(struct request_queue *q) | |
3432 | { | |
3433 | struct rbd_device *rbd_dev = q->queuedata; | |
3434 | struct request *rq; | |
3435 | int queued = 0; | |
3436 | ||
3437 | rbd_assert(rbd_dev); | |
3438 | ||
3439 | while ((rq = blk_fetch_request(q))) { | |
3440 | /* Ignore any non-FS requests that filter through. */ | |
3441 | if (rq->cmd_type != REQ_TYPE_FS) { | |
3442 | dout("%s: non-fs request type %d\n", __func__, | |
3443 | (int) rq->cmd_type); | |
3444 | __blk_end_request_all(rq, 0); | |
3445 | continue; | |
bf0d5f50 | 3446 | } |
bc1ecc65 ID |
3447 | |
3448 | list_add_tail(&rq->queuelist, &rbd_dev->rq_queue); | |
3449 | queued++; | |
bf0d5f50 | 3450 | } |
bc1ecc65 ID |
3451 | |
3452 | if (queued) | |
f5ee37bd | 3453 | queue_work(rbd_wq, &rbd_dev->rq_work); |
bf0d5f50 AE |
3454 | } |
3455 | ||
602adf40 YS |
3456 | /* |
3457 | * a queue callback. Makes sure that we don't create a bio that spans across | |
3458 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 3459 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
3460 | */ |
3461 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
3462 | struct bio_vec *bvec) | |
3463 | { | |
3464 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
3465 | sector_t sector_offset; |
3466 | sector_t sectors_per_obj; | |
3467 | sector_t obj_sector_offset; | |
3468 | int ret; | |
3469 | ||
3470 | /* | |
3471 | * Find how far into its rbd object the partition-relative | |
3472 | * bio start sector is to offset relative to the enclosing | |
3473 | * device. | |
3474 | */ | |
3475 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
3476 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
3477 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
3478 | ||
3479 | /* | |
3480 | * Compute the number of bytes from that offset to the end | |
3481 | * of the object. Account for what's already used by the bio. | |
3482 | */ | |
3483 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
3484 | if (ret > bmd->bi_size) | |
3485 | ret -= bmd->bi_size; | |
3486 | else | |
3487 | ret = 0; | |
3488 | ||
3489 | /* | |
3490 | * Don't send back more than was asked for. And if the bio | |
3491 | * was empty, let the whole thing through because: "Note | |
3492 | * that a block device *must* allow a single page to be | |
3493 | * added to an empty bio." | |
3494 | */ | |
3495 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
3496 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
3497 | ret = (int) bvec->bv_len; | |
3498 | ||
3499 | return ret; | |
602adf40 YS |
3500 | } |
3501 | ||
3502 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
3503 | { | |
3504 | struct gendisk *disk = rbd_dev->disk; | |
3505 | ||
3506 | if (!disk) | |
3507 | return; | |
3508 | ||
a0cab924 AE |
3509 | rbd_dev->disk = NULL; |
3510 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 3511 | del_gendisk(disk); |
a0cab924 AE |
3512 | if (disk->queue) |
3513 | blk_cleanup_queue(disk->queue); | |
3514 | } | |
602adf40 YS |
3515 | put_disk(disk); |
3516 | } | |
3517 | ||
788e2df3 AE |
3518 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
3519 | const char *object_name, | |
7097f8df | 3520 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
3521 | |
3522 | { | |
2169238d | 3523 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 3524 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
3525 | struct page **pages = NULL; |
3526 | u32 page_count; | |
1ceae7ef | 3527 | size_t size; |
788e2df3 AE |
3528 | int ret; |
3529 | ||
3530 | page_count = (u32) calc_pages_for(offset, length); | |
3531 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
3532 | if (IS_ERR(pages)) | |
a8d42056 | 3533 | return PTR_ERR(pages); |
788e2df3 AE |
3534 | |
3535 | ret = -ENOMEM; | |
3536 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 3537 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
3538 | if (!obj_request) |
3539 | goto out; | |
3540 | ||
3541 | obj_request->pages = pages; | |
3542 | obj_request->page_count = page_count; | |
3543 | ||
6d2940c8 | 3544 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
deb236b3 | 3545 | obj_request); |
788e2df3 AE |
3546 | if (!obj_request->osd_req) |
3547 | goto out; | |
3548 | ||
c99d2d4a AE |
3549 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
3550 | offset, length, 0, 0); | |
406e2c9f | 3551 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 3552 | obj_request->pages, |
44cd188d AE |
3553 | obj_request->length, |
3554 | obj_request->offset & ~PAGE_MASK, | |
3555 | false, false); | |
9d4df01f | 3556 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3557 | |
788e2df3 AE |
3558 | ret = rbd_obj_request_submit(osdc, obj_request); |
3559 | if (ret) | |
3560 | goto out; | |
3561 | ret = rbd_obj_request_wait(obj_request); | |
3562 | if (ret) | |
3563 | goto out; | |
3564 | ||
3565 | ret = obj_request->result; | |
3566 | if (ret < 0) | |
3567 | goto out; | |
1ceae7ef AE |
3568 | |
3569 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
3570 | size = (size_t) obj_request->xferred; | |
903bb32e | 3571 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
3572 | rbd_assert(size <= (size_t)INT_MAX); |
3573 | ret = (int)size; | |
788e2df3 AE |
3574 | out: |
3575 | if (obj_request) | |
3576 | rbd_obj_request_put(obj_request); | |
3577 | else | |
3578 | ceph_release_page_vector(pages, page_count); | |
3579 | ||
3580 | return ret; | |
3581 | } | |
3582 | ||
602adf40 | 3583 | /* |
662518b1 AE |
3584 | * Read the complete header for the given rbd device. On successful |
3585 | * return, the rbd_dev->header field will contain up-to-date | |
3586 | * information about the image. | |
602adf40 | 3587 | */ |
99a41ebc | 3588 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3589 | { |
4156d998 | 3590 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3591 | u32 snap_count = 0; |
4156d998 AE |
3592 | u64 names_size = 0; |
3593 | u32 want_count; | |
3594 | int ret; | |
602adf40 | 3595 | |
00f1f36f | 3596 | /* |
4156d998 AE |
3597 | * The complete header will include an array of its 64-bit |
3598 | * snapshot ids, followed by the names of those snapshots as | |
3599 | * a contiguous block of NUL-terminated strings. Note that | |
3600 | * the number of snapshots could change by the time we read | |
3601 | * it in, in which case we re-read it. | |
00f1f36f | 3602 | */ |
4156d998 AE |
3603 | do { |
3604 | size_t size; | |
3605 | ||
3606 | kfree(ondisk); | |
3607 | ||
3608 | size = sizeof (*ondisk); | |
3609 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3610 | size += names_size; | |
3611 | ondisk = kmalloc(size, GFP_KERNEL); | |
3612 | if (!ondisk) | |
662518b1 | 3613 | return -ENOMEM; |
4156d998 | 3614 | |
788e2df3 | 3615 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 3616 | 0, size, ondisk); |
4156d998 | 3617 | if (ret < 0) |
662518b1 | 3618 | goto out; |
c0cd10db | 3619 | if ((size_t)ret < size) { |
4156d998 | 3620 | ret = -ENXIO; |
06ecc6cb AE |
3621 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3622 | size, ret); | |
662518b1 | 3623 | goto out; |
4156d998 AE |
3624 | } |
3625 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3626 | ret = -ENXIO; | |
06ecc6cb | 3627 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3628 | goto out; |
81e759fb | 3629 | } |
602adf40 | 3630 | |
4156d998 AE |
3631 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3632 | want_count = snap_count; | |
3633 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3634 | } while (snap_count != want_count); | |
00f1f36f | 3635 | |
662518b1 AE |
3636 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3637 | out: | |
4156d998 AE |
3638 | kfree(ondisk); |
3639 | ||
3640 | return ret; | |
602adf40 YS |
3641 | } |
3642 | ||
15228ede AE |
3643 | /* |
3644 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3645 | * has disappeared from the (just updated) snapshot context. | |
3646 | */ | |
3647 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3648 | { | |
3649 | u64 snap_id; | |
3650 | ||
3651 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3652 | return; | |
3653 | ||
3654 | snap_id = rbd_dev->spec->snap_id; | |
3655 | if (snap_id == CEPH_NOSNAP) | |
3656 | return; | |
3657 | ||
3658 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3659 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3660 | } | |
3661 | ||
9875201e JD |
3662 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3663 | { | |
3664 | sector_t size; | |
3665 | bool removing; | |
3666 | ||
3667 | /* | |
3668 | * Don't hold the lock while doing disk operations, | |
3669 | * or lock ordering will conflict with the bdev mutex via: | |
3670 | * rbd_add() -> blkdev_get() -> rbd_open() | |
3671 | */ | |
3672 | spin_lock_irq(&rbd_dev->lock); | |
3673 | removing = test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
3674 | spin_unlock_irq(&rbd_dev->lock); | |
3675 | /* | |
3676 | * If the device is being removed, rbd_dev->disk has | |
3677 | * been destroyed, so don't try to update its size | |
3678 | */ | |
3679 | if (!removing) { | |
3680 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3681 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3682 | set_capacity(rbd_dev->disk, size); | |
3683 | revalidate_disk(rbd_dev->disk); | |
3684 | } | |
3685 | } | |
3686 | ||
cc4a38bd | 3687 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3688 | { |
e627db08 | 3689 | u64 mapping_size; |
1fe5e993 AE |
3690 | int ret; |
3691 | ||
cfbf6377 | 3692 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3693 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3694 | |
3695 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b ID |
3696 | if (ret) |
3697 | return ret; | |
15228ede | 3698 | |
e8f59b59 ID |
3699 | /* |
3700 | * If there is a parent, see if it has disappeared due to the | |
3701 | * mapped image getting flattened. | |
3702 | */ | |
3703 | if (rbd_dev->parent) { | |
3704 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3705 | if (ret) | |
3706 | return ret; | |
3707 | } | |
3708 | ||
5ff1108c ID |
3709 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
3710 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) | |
3711 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
3712 | } else { | |
3713 | /* validate mapped snapshot's EXISTS flag */ | |
3714 | rbd_exists_validate(rbd_dev); | |
3715 | } | |
15228ede | 3716 | |
cfbf6377 AE |
3717 | up_write(&rbd_dev->header_rwsem); |
3718 | ||
e8f59b59 | 3719 | if (mapping_size != rbd_dev->mapping.size) |
9875201e | 3720 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3721 | |
52bb1f9b | 3722 | return 0; |
1fe5e993 AE |
3723 | } |
3724 | ||
602adf40 YS |
3725 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3726 | { | |
3727 | struct gendisk *disk; | |
3728 | struct request_queue *q; | |
593a9e7b | 3729 | u64 segment_size; |
602adf40 | 3730 | |
602adf40 | 3731 | /* create gendisk info */ |
7e513d43 ID |
3732 | disk = alloc_disk(single_major ? |
3733 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3734 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3735 | if (!disk) |
1fcdb8aa | 3736 | return -ENOMEM; |
602adf40 | 3737 | |
f0f8cef5 | 3738 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3739 | rbd_dev->dev_id); |
602adf40 | 3740 | disk->major = rbd_dev->major; |
dd82fff1 | 3741 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3742 | if (single_major) |
3743 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3744 | disk->fops = &rbd_bd_ops; |
3745 | disk->private_data = rbd_dev; | |
3746 | ||
bf0d5f50 | 3747 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3748 | if (!q) |
3749 | goto out_disk; | |
029bcbd8 | 3750 | |
593a9e7b AE |
3751 | /* We use the default size, but let's be explicit about it. */ |
3752 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3753 | ||
029bcbd8 | 3754 | /* set io sizes to object size */ |
593a9e7b AE |
3755 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3756 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3757 | blk_queue_max_segment_size(q, segment_size); | |
3758 | blk_queue_io_min(q, segment_size); | |
3759 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3760 | |
90e98c52 GZ |
3761 | /* enable the discard support */ |
3762 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
3763 | q->limits.discard_granularity = segment_size; | |
3764 | q->limits.discard_alignment = segment_size; | |
b76f8239 JD |
3765 | q->limits.max_discard_sectors = segment_size / SECTOR_SIZE; |
3766 | q->limits.discard_zeroes_data = 1; | |
90e98c52 | 3767 | |
602adf40 YS |
3768 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3769 | disk->queue = q; | |
3770 | ||
3771 | q->queuedata = rbd_dev; | |
3772 | ||
3773 | rbd_dev->disk = disk; | |
602adf40 | 3774 | |
602adf40 | 3775 | return 0; |
602adf40 YS |
3776 | out_disk: |
3777 | put_disk(disk); | |
1fcdb8aa AE |
3778 | |
3779 | return -ENOMEM; | |
602adf40 YS |
3780 | } |
3781 | ||
dfc5606d YS |
3782 | /* |
3783 | sysfs | |
3784 | */ | |
3785 | ||
593a9e7b AE |
3786 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3787 | { | |
3788 | return container_of(dev, struct rbd_device, dev); | |
3789 | } | |
3790 | ||
dfc5606d YS |
3791 | static ssize_t rbd_size_show(struct device *dev, |
3792 | struct device_attribute *attr, char *buf) | |
3793 | { | |
593a9e7b | 3794 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3795 | |
fc71d833 AE |
3796 | return sprintf(buf, "%llu\n", |
3797 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3798 | } |
3799 | ||
34b13184 AE |
3800 | /* |
3801 | * Note this shows the features for whatever's mapped, which is not | |
3802 | * necessarily the base image. | |
3803 | */ | |
3804 | static ssize_t rbd_features_show(struct device *dev, | |
3805 | struct device_attribute *attr, char *buf) | |
3806 | { | |
3807 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3808 | ||
3809 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3810 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3811 | } |
3812 | ||
dfc5606d YS |
3813 | static ssize_t rbd_major_show(struct device *dev, |
3814 | struct device_attribute *attr, char *buf) | |
3815 | { | |
593a9e7b | 3816 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3817 | |
fc71d833 AE |
3818 | if (rbd_dev->major) |
3819 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3820 | ||
3821 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
3822 | } |
3823 | ||
3824 | static ssize_t rbd_minor_show(struct device *dev, | |
3825 | struct device_attribute *attr, char *buf) | |
3826 | { | |
3827 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 3828 | |
dd82fff1 | 3829 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
3830 | } |
3831 | ||
3832 | static ssize_t rbd_client_id_show(struct device *dev, | |
3833 | struct device_attribute *attr, char *buf) | |
602adf40 | 3834 | { |
593a9e7b | 3835 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3836 | |
1dbb4399 AE |
3837 | return sprintf(buf, "client%lld\n", |
3838 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3839 | } |
3840 | ||
dfc5606d YS |
3841 | static ssize_t rbd_pool_show(struct device *dev, |
3842 | struct device_attribute *attr, char *buf) | |
602adf40 | 3843 | { |
593a9e7b | 3844 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3845 | |
0d7dbfce | 3846 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3847 | } |
3848 | ||
9bb2f334 AE |
3849 | static ssize_t rbd_pool_id_show(struct device *dev, |
3850 | struct device_attribute *attr, char *buf) | |
3851 | { | |
3852 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3853 | ||
0d7dbfce | 3854 | return sprintf(buf, "%llu\n", |
fc71d833 | 3855 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3856 | } |
3857 | ||
dfc5606d YS |
3858 | static ssize_t rbd_name_show(struct device *dev, |
3859 | struct device_attribute *attr, char *buf) | |
3860 | { | |
593a9e7b | 3861 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3862 | |
a92ffdf8 AE |
3863 | if (rbd_dev->spec->image_name) |
3864 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3865 | ||
3866 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3867 | } |
3868 | ||
589d30e0 AE |
3869 | static ssize_t rbd_image_id_show(struct device *dev, |
3870 | struct device_attribute *attr, char *buf) | |
3871 | { | |
3872 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3873 | ||
0d7dbfce | 3874 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3875 | } |
3876 | ||
34b13184 AE |
3877 | /* |
3878 | * Shows the name of the currently-mapped snapshot (or | |
3879 | * RBD_SNAP_HEAD_NAME for the base image). | |
3880 | */ | |
dfc5606d YS |
3881 | static ssize_t rbd_snap_show(struct device *dev, |
3882 | struct device_attribute *attr, | |
3883 | char *buf) | |
3884 | { | |
593a9e7b | 3885 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3886 | |
0d7dbfce | 3887 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3888 | } |
3889 | ||
86b00e0d | 3890 | /* |
ff96128f ID |
3891 | * For a v2 image, shows the chain of parent images, separated by empty |
3892 | * lines. For v1 images or if there is no parent, shows "(no parent | |
3893 | * image)". | |
86b00e0d AE |
3894 | */ |
3895 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
3896 | struct device_attribute *attr, |
3897 | char *buf) | |
86b00e0d AE |
3898 | { |
3899 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 3900 | ssize_t count = 0; |
86b00e0d | 3901 | |
ff96128f | 3902 | if (!rbd_dev->parent) |
86b00e0d AE |
3903 | return sprintf(buf, "(no parent image)\n"); |
3904 | ||
ff96128f ID |
3905 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
3906 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3907 | ||
3908 | count += sprintf(&buf[count], "%s" | |
3909 | "pool_id %llu\npool_name %s\n" | |
3910 | "image_id %s\nimage_name %s\n" | |
3911 | "snap_id %llu\nsnap_name %s\n" | |
3912 | "overlap %llu\n", | |
3913 | !count ? "" : "\n", /* first? */ | |
3914 | spec->pool_id, spec->pool_name, | |
3915 | spec->image_id, spec->image_name ?: "(unknown)", | |
3916 | spec->snap_id, spec->snap_name, | |
3917 | rbd_dev->parent_overlap); | |
3918 | } | |
3919 | ||
3920 | return count; | |
86b00e0d AE |
3921 | } |
3922 | ||
dfc5606d YS |
3923 | static ssize_t rbd_image_refresh(struct device *dev, |
3924 | struct device_attribute *attr, | |
3925 | const char *buf, | |
3926 | size_t size) | |
3927 | { | |
593a9e7b | 3928 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3929 | int ret; |
602adf40 | 3930 | |
cc4a38bd | 3931 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 3932 | if (ret) |
52bb1f9b | 3933 | return ret; |
b813623a | 3934 | |
52bb1f9b | 3935 | return size; |
dfc5606d | 3936 | } |
602adf40 | 3937 | |
dfc5606d | 3938 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3939 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 3940 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 3941 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
dfc5606d YS |
3942 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
3943 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3944 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3945 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3946 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3947 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3948 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3949 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3950 | |
3951 | static struct attribute *rbd_attrs[] = { | |
3952 | &dev_attr_size.attr, | |
34b13184 | 3953 | &dev_attr_features.attr, |
dfc5606d | 3954 | &dev_attr_major.attr, |
dd82fff1 | 3955 | &dev_attr_minor.attr, |
dfc5606d YS |
3956 | &dev_attr_client_id.attr, |
3957 | &dev_attr_pool.attr, | |
9bb2f334 | 3958 | &dev_attr_pool_id.attr, |
dfc5606d | 3959 | &dev_attr_name.attr, |
589d30e0 | 3960 | &dev_attr_image_id.attr, |
dfc5606d | 3961 | &dev_attr_current_snap.attr, |
86b00e0d | 3962 | &dev_attr_parent.attr, |
dfc5606d | 3963 | &dev_attr_refresh.attr, |
dfc5606d YS |
3964 | NULL |
3965 | }; | |
3966 | ||
3967 | static struct attribute_group rbd_attr_group = { | |
3968 | .attrs = rbd_attrs, | |
3969 | }; | |
3970 | ||
3971 | static const struct attribute_group *rbd_attr_groups[] = { | |
3972 | &rbd_attr_group, | |
3973 | NULL | |
3974 | }; | |
3975 | ||
3976 | static void rbd_sysfs_dev_release(struct device *dev) | |
3977 | { | |
3978 | } | |
3979 | ||
3980 | static struct device_type rbd_device_type = { | |
3981 | .name = "rbd", | |
3982 | .groups = rbd_attr_groups, | |
3983 | .release = rbd_sysfs_dev_release, | |
3984 | }; | |
3985 | ||
8b8fb99c AE |
3986 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3987 | { | |
3988 | kref_get(&spec->kref); | |
3989 | ||
3990 | return spec; | |
3991 | } | |
3992 | ||
3993 | static void rbd_spec_free(struct kref *kref); | |
3994 | static void rbd_spec_put(struct rbd_spec *spec) | |
3995 | { | |
3996 | if (spec) | |
3997 | kref_put(&spec->kref, rbd_spec_free); | |
3998 | } | |
3999 | ||
4000 | static struct rbd_spec *rbd_spec_alloc(void) | |
4001 | { | |
4002 | struct rbd_spec *spec; | |
4003 | ||
4004 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
4005 | if (!spec) | |
4006 | return NULL; | |
04077599 ID |
4007 | |
4008 | spec->pool_id = CEPH_NOPOOL; | |
4009 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
4010 | kref_init(&spec->kref); |
4011 | ||
8b8fb99c AE |
4012 | return spec; |
4013 | } | |
4014 | ||
4015 | static void rbd_spec_free(struct kref *kref) | |
4016 | { | |
4017 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
4018 | ||
4019 | kfree(spec->pool_name); | |
4020 | kfree(spec->image_id); | |
4021 | kfree(spec->image_name); | |
4022 | kfree(spec->snap_name); | |
4023 | kfree(spec); | |
4024 | } | |
4025 | ||
cc344fa1 | 4026 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
4027 | struct rbd_spec *spec) |
4028 | { | |
4029 | struct rbd_device *rbd_dev; | |
4030 | ||
4031 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
4032 | if (!rbd_dev) | |
4033 | return NULL; | |
4034 | ||
4035 | spin_lock_init(&rbd_dev->lock); | |
bc1ecc65 ID |
4036 | INIT_LIST_HEAD(&rbd_dev->rq_queue); |
4037 | INIT_WORK(&rbd_dev->rq_work, rbd_request_workfn); | |
6d292906 | 4038 | rbd_dev->flags = 0; |
a2acd00e | 4039 | atomic_set(&rbd_dev->parent_ref, 0); |
c53d5893 | 4040 | INIT_LIST_HEAD(&rbd_dev->node); |
c53d5893 AE |
4041 | init_rwsem(&rbd_dev->header_rwsem); |
4042 | ||
4043 | rbd_dev->spec = spec; | |
4044 | rbd_dev->rbd_client = rbdc; | |
4045 | ||
0903e875 AE |
4046 | /* Initialize the layout used for all rbd requests */ |
4047 | ||
4048 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
4049 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
4050 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
4051 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
4052 | ||
c53d5893 AE |
4053 | return rbd_dev; |
4054 | } | |
4055 | ||
4056 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
4057 | { | |
c53d5893 AE |
4058 | rbd_put_client(rbd_dev->rbd_client); |
4059 | rbd_spec_put(rbd_dev->spec); | |
4060 | kfree(rbd_dev); | |
4061 | } | |
4062 | ||
9d475de5 AE |
4063 | /* |
4064 | * Get the size and object order for an image snapshot, or if | |
4065 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
4066 | * image. | |
4067 | */ | |
4068 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
4069 | u8 *order, u64 *snap_size) | |
4070 | { | |
4071 | __le64 snapid = cpu_to_le64(snap_id); | |
4072 | int ret; | |
4073 | struct { | |
4074 | u8 order; | |
4075 | __le64 size; | |
4076 | } __attribute__ ((packed)) size_buf = { 0 }; | |
4077 | ||
36be9a76 | 4078 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 4079 | "rbd", "get_size", |
4157976b | 4080 | &snapid, sizeof (snapid), |
e2a58ee5 | 4081 | &size_buf, sizeof (size_buf)); |
36be9a76 | 4082 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
4083 | if (ret < 0) |
4084 | return ret; | |
57385b51 AE |
4085 | if (ret < sizeof (size_buf)) |
4086 | return -ERANGE; | |
9d475de5 | 4087 | |
c3545579 | 4088 | if (order) { |
c86f86e9 | 4089 | *order = size_buf.order; |
c3545579 JD |
4090 | dout(" order %u", (unsigned int)*order); |
4091 | } | |
9d475de5 AE |
4092 | *snap_size = le64_to_cpu(size_buf.size); |
4093 | ||
c3545579 JD |
4094 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
4095 | (unsigned long long)snap_id, | |
57385b51 | 4096 | (unsigned long long)*snap_size); |
9d475de5 AE |
4097 | |
4098 | return 0; | |
4099 | } | |
4100 | ||
4101 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
4102 | { | |
4103 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
4104 | &rbd_dev->header.obj_order, | |
4105 | &rbd_dev->header.image_size); | |
4106 | } | |
4107 | ||
1e130199 AE |
4108 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
4109 | { | |
4110 | void *reply_buf; | |
4111 | int ret; | |
4112 | void *p; | |
4113 | ||
4114 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
4115 | if (!reply_buf) | |
4116 | return -ENOMEM; | |
4117 | ||
36be9a76 | 4118 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 4119 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 4120 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 4121 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
4122 | if (ret < 0) |
4123 | goto out; | |
4124 | ||
4125 | p = reply_buf; | |
4126 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
4127 | p + ret, NULL, GFP_NOIO); |
4128 | ret = 0; | |
1e130199 AE |
4129 | |
4130 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
4131 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
4132 | rbd_dev->header.object_prefix = NULL; | |
4133 | } else { | |
4134 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
4135 | } | |
1e130199 AE |
4136 | out: |
4137 | kfree(reply_buf); | |
4138 | ||
4139 | return ret; | |
4140 | } | |
4141 | ||
b1b5402a AE |
4142 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
4143 | u64 *snap_features) | |
4144 | { | |
4145 | __le64 snapid = cpu_to_le64(snap_id); | |
4146 | struct { | |
4147 | __le64 features; | |
4148 | __le64 incompat; | |
4157976b | 4149 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 4150 | u64 incompat; |
b1b5402a AE |
4151 | int ret; |
4152 | ||
36be9a76 | 4153 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 4154 | "rbd", "get_features", |
4157976b | 4155 | &snapid, sizeof (snapid), |
e2a58ee5 | 4156 | &features_buf, sizeof (features_buf)); |
36be9a76 | 4157 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4158 | if (ret < 0) |
4159 | return ret; | |
57385b51 AE |
4160 | if (ret < sizeof (features_buf)) |
4161 | return -ERANGE; | |
d889140c AE |
4162 | |
4163 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 4164 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 4165 | return -ENXIO; |
d889140c | 4166 | |
b1b5402a AE |
4167 | *snap_features = le64_to_cpu(features_buf.features); |
4168 | ||
4169 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4170 | (unsigned long long)snap_id, |
4171 | (unsigned long long)*snap_features, | |
4172 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4173 | |
4174 | return 0; | |
4175 | } | |
4176 | ||
4177 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4178 | { | |
4179 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4180 | &rbd_dev->header.features); | |
4181 | } | |
4182 | ||
86b00e0d AE |
4183 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4184 | { | |
4185 | struct rbd_spec *parent_spec; | |
4186 | size_t size; | |
4187 | void *reply_buf = NULL; | |
4188 | __le64 snapid; | |
4189 | void *p; | |
4190 | void *end; | |
642a2537 | 4191 | u64 pool_id; |
86b00e0d | 4192 | char *image_id; |
3b5cf2a2 | 4193 | u64 snap_id; |
86b00e0d | 4194 | u64 overlap; |
86b00e0d AE |
4195 | int ret; |
4196 | ||
4197 | parent_spec = rbd_spec_alloc(); | |
4198 | if (!parent_spec) | |
4199 | return -ENOMEM; | |
4200 | ||
4201 | size = sizeof (__le64) + /* pool_id */ | |
4202 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4203 | sizeof (__le64) + /* snap_id */ | |
4204 | sizeof (__le64); /* overlap */ | |
4205 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4206 | if (!reply_buf) { | |
4207 | ret = -ENOMEM; | |
4208 | goto out_err; | |
4209 | } | |
4210 | ||
4d9b67cd | 4211 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
36be9a76 | 4212 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 4213 | "rbd", "get_parent", |
4157976b | 4214 | &snapid, sizeof (snapid), |
e2a58ee5 | 4215 | reply_buf, size); |
36be9a76 | 4216 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4217 | if (ret < 0) |
4218 | goto out_err; | |
4219 | ||
86b00e0d | 4220 | p = reply_buf; |
57385b51 AE |
4221 | end = reply_buf + ret; |
4222 | ret = -ERANGE; | |
642a2537 | 4223 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4224 | if (pool_id == CEPH_NOPOOL) { |
4225 | /* | |
4226 | * Either the parent never existed, or we have | |
4227 | * record of it but the image got flattened so it no | |
4228 | * longer has a parent. When the parent of a | |
4229 | * layered image disappears we immediately set the | |
4230 | * overlap to 0. The effect of this is that all new | |
4231 | * requests will be treated as if the image had no | |
4232 | * parent. | |
4233 | */ | |
4234 | if (rbd_dev->parent_overlap) { | |
4235 | rbd_dev->parent_overlap = 0; | |
392a9dad AE |
4236 | rbd_dev_parent_put(rbd_dev); |
4237 | pr_info("%s: clone image has been flattened\n", | |
4238 | rbd_dev->disk->disk_name); | |
4239 | } | |
4240 | ||
86b00e0d | 4241 | goto out; /* No parent? No problem. */ |
392a9dad | 4242 | } |
86b00e0d | 4243 | |
0903e875 AE |
4244 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4245 | ||
4246 | ret = -EIO; | |
642a2537 | 4247 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4248 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4249 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4250 | goto out_err; |
c0cd10db | 4251 | } |
0903e875 | 4252 | |
979ed480 | 4253 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4254 | if (IS_ERR(image_id)) { |
4255 | ret = PTR_ERR(image_id); | |
4256 | goto out_err; | |
4257 | } | |
3b5cf2a2 | 4258 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4259 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4260 | ||
3b5cf2a2 AE |
4261 | /* |
4262 | * The parent won't change (except when the clone is | |
4263 | * flattened, already handled that). So we only need to | |
4264 | * record the parent spec we have not already done so. | |
4265 | */ | |
4266 | if (!rbd_dev->parent_spec) { | |
4267 | parent_spec->pool_id = pool_id; | |
4268 | parent_spec->image_id = image_id; | |
4269 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4270 | rbd_dev->parent_spec = parent_spec; |
4271 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4272 | } else { |
4273 | kfree(image_id); | |
3b5cf2a2 AE |
4274 | } |
4275 | ||
4276 | /* | |
4277 | * We always update the parent overlap. If it's zero we | |
4278 | * treat it specially. | |
4279 | */ | |
4280 | rbd_dev->parent_overlap = overlap; | |
3b5cf2a2 AE |
4281 | if (!overlap) { |
4282 | ||
4283 | /* A null parent_spec indicates it's the initial probe */ | |
4284 | ||
4285 | if (parent_spec) { | |
4286 | /* | |
4287 | * The overlap has become zero, so the clone | |
4288 | * must have been resized down to 0 at some | |
4289 | * point. Treat this the same as a flatten. | |
4290 | */ | |
4291 | rbd_dev_parent_put(rbd_dev); | |
4292 | pr_info("%s: clone image now standalone\n", | |
4293 | rbd_dev->disk->disk_name); | |
4294 | } else { | |
4295 | /* | |
4296 | * For the initial probe, if we find the | |
4297 | * overlap is zero we just pretend there was | |
4298 | * no parent image. | |
4299 | */ | |
9584d508 | 4300 | rbd_warn(rbd_dev, "ignoring parent with overlap 0"); |
3b5cf2a2 | 4301 | } |
70cf49cf | 4302 | } |
86b00e0d AE |
4303 | out: |
4304 | ret = 0; | |
4305 | out_err: | |
4306 | kfree(reply_buf); | |
4307 | rbd_spec_put(parent_spec); | |
4308 | ||
4309 | return ret; | |
4310 | } | |
4311 | ||
cc070d59 AE |
4312 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4313 | { | |
4314 | struct { | |
4315 | __le64 stripe_unit; | |
4316 | __le64 stripe_count; | |
4317 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4318 | size_t size = sizeof (striping_info_buf); | |
4319 | void *p; | |
4320 | u64 obj_size; | |
4321 | u64 stripe_unit; | |
4322 | u64 stripe_count; | |
4323 | int ret; | |
4324 | ||
4325 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
4326 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 4327 | (char *)&striping_info_buf, size); |
cc070d59 AE |
4328 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4329 | if (ret < 0) | |
4330 | return ret; | |
4331 | if (ret < size) | |
4332 | return -ERANGE; | |
4333 | ||
4334 | /* | |
4335 | * We don't actually support the "fancy striping" feature | |
4336 | * (STRIPINGV2) yet, but if the striping sizes are the | |
4337 | * defaults the behavior is the same as before. So find | |
4338 | * out, and only fail if the image has non-default values. | |
4339 | */ | |
4340 | ret = -EINVAL; | |
4341 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
4342 | p = &striping_info_buf; | |
4343 | stripe_unit = ceph_decode_64(&p); | |
4344 | if (stripe_unit != obj_size) { | |
4345 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
4346 | "(got %llu want %llu)", | |
4347 | stripe_unit, obj_size); | |
4348 | return -EINVAL; | |
4349 | } | |
4350 | stripe_count = ceph_decode_64(&p); | |
4351 | if (stripe_count != 1) { | |
4352 | rbd_warn(rbd_dev, "unsupported stripe count " | |
4353 | "(got %llu want 1)", stripe_count); | |
4354 | return -EINVAL; | |
4355 | } | |
500d0c0f AE |
4356 | rbd_dev->header.stripe_unit = stripe_unit; |
4357 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
4358 | |
4359 | return 0; | |
4360 | } | |
4361 | ||
9e15b77d AE |
4362 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4363 | { | |
4364 | size_t image_id_size; | |
4365 | char *image_id; | |
4366 | void *p; | |
4367 | void *end; | |
4368 | size_t size; | |
4369 | void *reply_buf = NULL; | |
4370 | size_t len = 0; | |
4371 | char *image_name = NULL; | |
4372 | int ret; | |
4373 | ||
4374 | rbd_assert(!rbd_dev->spec->image_name); | |
4375 | ||
69e7a02f AE |
4376 | len = strlen(rbd_dev->spec->image_id); |
4377 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4378 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4379 | if (!image_id) | |
4380 | return NULL; | |
4381 | ||
4382 | p = image_id; | |
4157976b | 4383 | end = image_id + image_id_size; |
57385b51 | 4384 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4385 | |
4386 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4387 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4388 | if (!reply_buf) | |
4389 | goto out; | |
4390 | ||
36be9a76 | 4391 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
4392 | "rbd", "dir_get_name", |
4393 | image_id, image_id_size, | |
e2a58ee5 | 4394 | reply_buf, size); |
9e15b77d AE |
4395 | if (ret < 0) |
4396 | goto out; | |
4397 | p = reply_buf; | |
f40eb349 AE |
4398 | end = reply_buf + ret; |
4399 | ||
9e15b77d AE |
4400 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4401 | if (IS_ERR(image_name)) | |
4402 | image_name = NULL; | |
4403 | else | |
4404 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4405 | out: | |
4406 | kfree(reply_buf); | |
4407 | kfree(image_id); | |
4408 | ||
4409 | return image_name; | |
4410 | } | |
4411 | ||
2ad3d716 AE |
4412 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4413 | { | |
4414 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4415 | const char *snap_name; | |
4416 | u32 which = 0; | |
4417 | ||
4418 | /* Skip over names until we find the one we are looking for */ | |
4419 | ||
4420 | snap_name = rbd_dev->header.snap_names; | |
4421 | while (which < snapc->num_snaps) { | |
4422 | if (!strcmp(name, snap_name)) | |
4423 | return snapc->snaps[which]; | |
4424 | snap_name += strlen(snap_name) + 1; | |
4425 | which++; | |
4426 | } | |
4427 | return CEPH_NOSNAP; | |
4428 | } | |
4429 | ||
4430 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4431 | { | |
4432 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4433 | u32 which; | |
4434 | bool found = false; | |
4435 | u64 snap_id; | |
4436 | ||
4437 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4438 | const char *snap_name; | |
4439 | ||
4440 | snap_id = snapc->snaps[which]; | |
4441 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4442 | if (IS_ERR(snap_name)) { |
4443 | /* ignore no-longer existing snapshots */ | |
4444 | if (PTR_ERR(snap_name) == -ENOENT) | |
4445 | continue; | |
4446 | else | |
4447 | break; | |
4448 | } | |
2ad3d716 AE |
4449 | found = !strcmp(name, snap_name); |
4450 | kfree(snap_name); | |
4451 | } | |
4452 | return found ? snap_id : CEPH_NOSNAP; | |
4453 | } | |
4454 | ||
4455 | /* | |
4456 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4457 | * no snapshot by that name is found, or if an error occurs. | |
4458 | */ | |
4459 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4460 | { | |
4461 | if (rbd_dev->image_format == 1) | |
4462 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4463 | ||
4464 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4465 | } | |
4466 | ||
9e15b77d | 4467 | /* |
04077599 ID |
4468 | * An image being mapped will have everything but the snap id. |
4469 | */ | |
4470 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4471 | { | |
4472 | struct rbd_spec *spec = rbd_dev->spec; | |
4473 | ||
4474 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4475 | rbd_assert(spec->image_id && spec->image_name); | |
4476 | rbd_assert(spec->snap_name); | |
4477 | ||
4478 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4479 | u64 snap_id; | |
4480 | ||
4481 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4482 | if (snap_id == CEPH_NOSNAP) | |
4483 | return -ENOENT; | |
4484 | ||
4485 | spec->snap_id = snap_id; | |
4486 | } else { | |
4487 | spec->snap_id = CEPH_NOSNAP; | |
4488 | } | |
4489 | ||
4490 | return 0; | |
4491 | } | |
4492 | ||
4493 | /* | |
4494 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4495 | * |
04077599 ID |
4496 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4497 | * can't figure out the name for an image id. | |
9e15b77d | 4498 | */ |
04077599 | 4499 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4500 | { |
2e9f7f1c AE |
4501 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4502 | struct rbd_spec *spec = rbd_dev->spec; | |
4503 | const char *pool_name; | |
4504 | const char *image_name; | |
4505 | const char *snap_name; | |
9e15b77d AE |
4506 | int ret; |
4507 | ||
04077599 ID |
4508 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4509 | rbd_assert(spec->image_id); | |
4510 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4511 | |
2e9f7f1c | 4512 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4513 | |
2e9f7f1c AE |
4514 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4515 | if (!pool_name) { | |
4516 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4517 | return -EIO; |
4518 | } | |
2e9f7f1c AE |
4519 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4520 | if (!pool_name) | |
9e15b77d AE |
4521 | return -ENOMEM; |
4522 | ||
4523 | /* Fetch the image name; tolerate failure here */ | |
4524 | ||
2e9f7f1c AE |
4525 | image_name = rbd_dev_image_name(rbd_dev); |
4526 | if (!image_name) | |
06ecc6cb | 4527 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4528 | |
04077599 | 4529 | /* Fetch the snapshot name */ |
9e15b77d | 4530 | |
2e9f7f1c | 4531 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4532 | if (IS_ERR(snap_name)) { |
4533 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4534 | goto out_err; |
2e9f7f1c AE |
4535 | } |
4536 | ||
4537 | spec->pool_name = pool_name; | |
4538 | spec->image_name = image_name; | |
4539 | spec->snap_name = snap_name; | |
9e15b77d AE |
4540 | |
4541 | return 0; | |
04077599 | 4542 | |
9e15b77d | 4543 | out_err: |
2e9f7f1c AE |
4544 | kfree(image_name); |
4545 | kfree(pool_name); | |
9e15b77d AE |
4546 | return ret; |
4547 | } | |
4548 | ||
cc4a38bd | 4549 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4550 | { |
4551 | size_t size; | |
4552 | int ret; | |
4553 | void *reply_buf; | |
4554 | void *p; | |
4555 | void *end; | |
4556 | u64 seq; | |
4557 | u32 snap_count; | |
4558 | struct ceph_snap_context *snapc; | |
4559 | u32 i; | |
4560 | ||
4561 | /* | |
4562 | * We'll need room for the seq value (maximum snapshot id), | |
4563 | * snapshot count, and array of that many snapshot ids. | |
4564 | * For now we have a fixed upper limit on the number we're | |
4565 | * prepared to receive. | |
4566 | */ | |
4567 | size = sizeof (__le64) + sizeof (__le32) + | |
4568 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4569 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4570 | if (!reply_buf) | |
4571 | return -ENOMEM; | |
4572 | ||
36be9a76 | 4573 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 4574 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 4575 | reply_buf, size); |
36be9a76 | 4576 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4577 | if (ret < 0) |
4578 | goto out; | |
4579 | ||
35d489f9 | 4580 | p = reply_buf; |
57385b51 AE |
4581 | end = reply_buf + ret; |
4582 | ret = -ERANGE; | |
35d489f9 AE |
4583 | ceph_decode_64_safe(&p, end, seq, out); |
4584 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4585 | ||
4586 | /* | |
4587 | * Make sure the reported number of snapshot ids wouldn't go | |
4588 | * beyond the end of our buffer. But before checking that, | |
4589 | * make sure the computed size of the snapshot context we | |
4590 | * allocate is representable in a size_t. | |
4591 | */ | |
4592 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4593 | / sizeof (u64)) { | |
4594 | ret = -EINVAL; | |
4595 | goto out; | |
4596 | } | |
4597 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4598 | goto out; | |
468521c1 | 4599 | ret = 0; |
35d489f9 | 4600 | |
812164f8 | 4601 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4602 | if (!snapc) { |
4603 | ret = -ENOMEM; | |
4604 | goto out; | |
4605 | } | |
35d489f9 | 4606 | snapc->seq = seq; |
35d489f9 AE |
4607 | for (i = 0; i < snap_count; i++) |
4608 | snapc->snaps[i] = ceph_decode_64(&p); | |
4609 | ||
49ece554 | 4610 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4611 | rbd_dev->header.snapc = snapc; |
4612 | ||
4613 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4614 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4615 | out: |
4616 | kfree(reply_buf); | |
4617 | ||
57385b51 | 4618 | return ret; |
35d489f9 AE |
4619 | } |
4620 | ||
54cac61f AE |
4621 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4622 | u64 snap_id) | |
b8b1e2db AE |
4623 | { |
4624 | size_t size; | |
4625 | void *reply_buf; | |
54cac61f | 4626 | __le64 snapid; |
b8b1e2db AE |
4627 | int ret; |
4628 | void *p; | |
4629 | void *end; | |
b8b1e2db AE |
4630 | char *snap_name; |
4631 | ||
4632 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4633 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4634 | if (!reply_buf) | |
4635 | return ERR_PTR(-ENOMEM); | |
4636 | ||
54cac61f | 4637 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 4638 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 4639 | "rbd", "get_snapshot_name", |
54cac61f | 4640 | &snapid, sizeof (snapid), |
e2a58ee5 | 4641 | reply_buf, size); |
36be9a76 | 4642 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4643 | if (ret < 0) { |
4644 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4645 | goto out; |
f40eb349 | 4646 | } |
b8b1e2db AE |
4647 | |
4648 | p = reply_buf; | |
f40eb349 | 4649 | end = reply_buf + ret; |
e5c35534 | 4650 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4651 | if (IS_ERR(snap_name)) |
b8b1e2db | 4652 | goto out; |
b8b1e2db | 4653 | |
f40eb349 | 4654 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4655 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4656 | out: |
4657 | kfree(reply_buf); | |
4658 | ||
f40eb349 | 4659 | return snap_name; |
b8b1e2db AE |
4660 | } |
4661 | ||
2df3fac7 | 4662 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4663 | { |
2df3fac7 | 4664 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4665 | int ret; |
117973fb | 4666 | |
1617e40c JD |
4667 | ret = rbd_dev_v2_image_size(rbd_dev); |
4668 | if (ret) | |
cfbf6377 | 4669 | return ret; |
1617e40c | 4670 | |
2df3fac7 AE |
4671 | if (first_time) { |
4672 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
4673 | if (ret) | |
cfbf6377 | 4674 | return ret; |
2df3fac7 AE |
4675 | } |
4676 | ||
cc4a38bd | 4677 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb | 4678 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
117973fb AE |
4679 | |
4680 | return ret; | |
4681 | } | |
4682 | ||
a720ae09 ID |
4683 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
4684 | { | |
4685 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4686 | ||
4687 | if (rbd_dev->image_format == 1) | |
4688 | return rbd_dev_v1_header_info(rbd_dev); | |
4689 | ||
4690 | return rbd_dev_v2_header_info(rbd_dev); | |
4691 | } | |
4692 | ||
dfc5606d YS |
4693 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4694 | { | |
dfc5606d | 4695 | struct device *dev; |
cd789ab9 | 4696 | int ret; |
dfc5606d | 4697 | |
cd789ab9 | 4698 | dev = &rbd_dev->dev; |
dfc5606d YS |
4699 | dev->bus = &rbd_bus_type; |
4700 | dev->type = &rbd_device_type; | |
4701 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4702 | dev->release = rbd_dev_device_release; |
de71a297 | 4703 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4704 | ret = device_register(dev); |
dfc5606d | 4705 | |
dfc5606d | 4706 | return ret; |
602adf40 YS |
4707 | } |
4708 | ||
dfc5606d YS |
4709 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4710 | { | |
4711 | device_unregister(&rbd_dev->dev); | |
4712 | } | |
4713 | ||
1ddbe94e | 4714 | /* |
499afd5b | 4715 | * Get a unique rbd identifier for the given new rbd_dev, and add |
f8a22fc2 | 4716 | * the rbd_dev to the global list. |
1ddbe94e | 4717 | */ |
f8a22fc2 | 4718 | static int rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4719 | { |
f8a22fc2 ID |
4720 | int new_dev_id; |
4721 | ||
9b60e70b ID |
4722 | new_dev_id = ida_simple_get(&rbd_dev_id_ida, |
4723 | 0, minor_to_rbd_dev_id(1 << MINORBITS), | |
4724 | GFP_KERNEL); | |
f8a22fc2 ID |
4725 | if (new_dev_id < 0) |
4726 | return new_dev_id; | |
4727 | ||
4728 | rbd_dev->dev_id = new_dev_id; | |
499afd5b AE |
4729 | |
4730 | spin_lock(&rbd_dev_list_lock); | |
4731 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4732 | spin_unlock(&rbd_dev_list_lock); | |
f8a22fc2 | 4733 | |
70eebd20 | 4734 | dout("rbd_dev %p given dev id %d\n", rbd_dev, rbd_dev->dev_id); |
f8a22fc2 ID |
4735 | |
4736 | return 0; | |
1ddbe94e | 4737 | } |
b7f23c36 | 4738 | |
1ddbe94e | 4739 | /* |
499afd5b AE |
4740 | * Remove an rbd_dev from the global list, and record that its |
4741 | * identifier is no longer in use. | |
1ddbe94e | 4742 | */ |
e2839308 | 4743 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4744 | { |
499afd5b AE |
4745 | spin_lock(&rbd_dev_list_lock); |
4746 | list_del_init(&rbd_dev->node); | |
4747 | spin_unlock(&rbd_dev_list_lock); | |
b7f23c36 | 4748 | |
f8a22fc2 ID |
4749 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
4750 | ||
4751 | dout("rbd_dev %p released dev id %d\n", rbd_dev, rbd_dev->dev_id); | |
b7f23c36 AE |
4752 | } |
4753 | ||
e28fff26 AE |
4754 | /* |
4755 | * Skips over white space at *buf, and updates *buf to point to the | |
4756 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4757 | * the token (string of non-white space characters) found. Note |
4758 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4759 | */ |
4760 | static inline size_t next_token(const char **buf) | |
4761 | { | |
4762 | /* | |
4763 | * These are the characters that produce nonzero for | |
4764 | * isspace() in the "C" and "POSIX" locales. | |
4765 | */ | |
4766 | const char *spaces = " \f\n\r\t\v"; | |
4767 | ||
4768 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4769 | ||
4770 | return strcspn(*buf, spaces); /* Return token length */ | |
4771 | } | |
4772 | ||
4773 | /* | |
4774 | * Finds the next token in *buf, and if the provided token buffer is | |
4775 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4776 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4777 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4778 | * |
4779 | * Returns the length of the token found (not including the '\0'). | |
4780 | * Return value will be 0 if no token is found, and it will be >= | |
4781 | * token_size if the token would not fit. | |
4782 | * | |
593a9e7b | 4783 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4784 | * found token. Note that this occurs even if the token buffer is |
4785 | * too small to hold it. | |
4786 | */ | |
4787 | static inline size_t copy_token(const char **buf, | |
4788 | char *token, | |
4789 | size_t token_size) | |
4790 | { | |
4791 | size_t len; | |
4792 | ||
4793 | len = next_token(buf); | |
4794 | if (len < token_size) { | |
4795 | memcpy(token, *buf, len); | |
4796 | *(token + len) = '\0'; | |
4797 | } | |
4798 | *buf += len; | |
4799 | ||
4800 | return len; | |
4801 | } | |
4802 | ||
ea3352f4 AE |
4803 | /* |
4804 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4805 | * enough to hold a copy of it, and copies the token into the new | |
4806 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4807 | * that a duplicate buffer is created even for a zero-length token. | |
4808 | * | |
4809 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4810 | * pointer if memory for the duplicate was not available. If | |
4811 | * the lenp argument is a non-null pointer, the length of the token | |
4812 | * (not including the '\0') is returned in *lenp. | |
4813 | * | |
4814 | * If successful, the *buf pointer will be updated to point beyond | |
4815 | * the end of the found token. | |
4816 | * | |
4817 | * Note: uses GFP_KERNEL for allocation. | |
4818 | */ | |
4819 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4820 | { | |
4821 | char *dup; | |
4822 | size_t len; | |
4823 | ||
4824 | len = next_token(buf); | |
4caf35f9 | 4825 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4826 | if (!dup) |
4827 | return NULL; | |
ea3352f4 AE |
4828 | *(dup + len) = '\0'; |
4829 | *buf += len; | |
4830 | ||
4831 | if (lenp) | |
4832 | *lenp = len; | |
4833 | ||
4834 | return dup; | |
4835 | } | |
4836 | ||
a725f65e | 4837 | /* |
859c31df AE |
4838 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4839 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4840 | * and the data written is passed here via a NUL-terminated buffer. | |
4841 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4842 | * |
859c31df AE |
4843 | * The information extracted from these options is recorded in |
4844 | * the other parameters which return dynamically-allocated | |
4845 | * structures: | |
4846 | * ceph_opts | |
4847 | * The address of a pointer that will refer to a ceph options | |
4848 | * structure. Caller must release the returned pointer using | |
4849 | * ceph_destroy_options() when it is no longer needed. | |
4850 | * rbd_opts | |
4851 | * Address of an rbd options pointer. Fully initialized by | |
4852 | * this function; caller must release with kfree(). | |
4853 | * spec | |
4854 | * Address of an rbd image specification pointer. Fully | |
4855 | * initialized by this function based on parsed options. | |
4856 | * Caller must release with rbd_spec_put(). | |
4857 | * | |
4858 | * The options passed take this form: | |
4859 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4860 | * where: | |
4861 | * <mon_addrs> | |
4862 | * A comma-separated list of one or more monitor addresses. | |
4863 | * A monitor address is an ip address, optionally followed | |
4864 | * by a port number (separated by a colon). | |
4865 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4866 | * <options> | |
4867 | * A comma-separated list of ceph and/or rbd options. | |
4868 | * <pool_name> | |
4869 | * The name of the rados pool containing the rbd image. | |
4870 | * <image_name> | |
4871 | * The name of the image in that pool to map. | |
4872 | * <snap_id> | |
4873 | * An optional snapshot id. If provided, the mapping will | |
4874 | * present data from the image at the time that snapshot was | |
4875 | * created. The image head is used if no snapshot id is | |
4876 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4877 | */ |
859c31df | 4878 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4879 | struct ceph_options **ceph_opts, |
859c31df AE |
4880 | struct rbd_options **opts, |
4881 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4882 | { |
d22f76e7 | 4883 | size_t len; |
859c31df | 4884 | char *options; |
0ddebc0c | 4885 | const char *mon_addrs; |
ecb4dc22 | 4886 | char *snap_name; |
0ddebc0c | 4887 | size_t mon_addrs_size; |
859c31df | 4888 | struct rbd_spec *spec = NULL; |
4e9afeba | 4889 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4890 | struct ceph_options *copts; |
dc79b113 | 4891 | int ret; |
e28fff26 AE |
4892 | |
4893 | /* The first four tokens are required */ | |
4894 | ||
7ef3214a | 4895 | len = next_token(&buf); |
4fb5d671 AE |
4896 | if (!len) { |
4897 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4898 | return -EINVAL; | |
4899 | } | |
0ddebc0c | 4900 | mon_addrs = buf; |
f28e565a | 4901 | mon_addrs_size = len + 1; |
7ef3214a | 4902 | buf += len; |
a725f65e | 4903 | |
dc79b113 | 4904 | ret = -EINVAL; |
f28e565a AE |
4905 | options = dup_token(&buf, NULL); |
4906 | if (!options) | |
dc79b113 | 4907 | return -ENOMEM; |
4fb5d671 AE |
4908 | if (!*options) { |
4909 | rbd_warn(NULL, "no options provided"); | |
4910 | goto out_err; | |
4911 | } | |
e28fff26 | 4912 | |
859c31df AE |
4913 | spec = rbd_spec_alloc(); |
4914 | if (!spec) | |
f28e565a | 4915 | goto out_mem; |
859c31df AE |
4916 | |
4917 | spec->pool_name = dup_token(&buf, NULL); | |
4918 | if (!spec->pool_name) | |
4919 | goto out_mem; | |
4fb5d671 AE |
4920 | if (!*spec->pool_name) { |
4921 | rbd_warn(NULL, "no pool name provided"); | |
4922 | goto out_err; | |
4923 | } | |
e28fff26 | 4924 | |
69e7a02f | 4925 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4926 | if (!spec->image_name) |
f28e565a | 4927 | goto out_mem; |
4fb5d671 AE |
4928 | if (!*spec->image_name) { |
4929 | rbd_warn(NULL, "no image name provided"); | |
4930 | goto out_err; | |
4931 | } | |
d4b125e9 | 4932 | |
f28e565a AE |
4933 | /* |
4934 | * Snapshot name is optional; default is to use "-" | |
4935 | * (indicating the head/no snapshot). | |
4936 | */ | |
3feeb894 | 4937 | len = next_token(&buf); |
820a5f3e | 4938 | if (!len) { |
3feeb894 AE |
4939 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4940 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4941 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4942 | ret = -ENAMETOOLONG; |
f28e565a | 4943 | goto out_err; |
849b4260 | 4944 | } |
ecb4dc22 AE |
4945 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4946 | if (!snap_name) | |
f28e565a | 4947 | goto out_mem; |
ecb4dc22 AE |
4948 | *(snap_name + len) = '\0'; |
4949 | spec->snap_name = snap_name; | |
e5c35534 | 4950 | |
0ddebc0c | 4951 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4952 | |
4e9afeba AE |
4953 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4954 | if (!rbd_opts) | |
4955 | goto out_mem; | |
4956 | ||
4957 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4958 | |
859c31df | 4959 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4960 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4961 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4962 | if (IS_ERR(copts)) { |
4963 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4964 | goto out_err; |
4965 | } | |
859c31df AE |
4966 | kfree(options); |
4967 | ||
4968 | *ceph_opts = copts; | |
4e9afeba | 4969 | *opts = rbd_opts; |
859c31df | 4970 | *rbd_spec = spec; |
0ddebc0c | 4971 | |
dc79b113 | 4972 | return 0; |
f28e565a | 4973 | out_mem: |
dc79b113 | 4974 | ret = -ENOMEM; |
d22f76e7 | 4975 | out_err: |
859c31df AE |
4976 | kfree(rbd_opts); |
4977 | rbd_spec_put(spec); | |
f28e565a | 4978 | kfree(options); |
d22f76e7 | 4979 | |
dc79b113 | 4980 | return ret; |
a725f65e AE |
4981 | } |
4982 | ||
30ba1f02 ID |
4983 | /* |
4984 | * Return pool id (>= 0) or a negative error code. | |
4985 | */ | |
4986 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
4987 | { | |
4988 | u64 newest_epoch; | |
4989 | unsigned long timeout = rbdc->client->options->mount_timeout * HZ; | |
4990 | int tries = 0; | |
4991 | int ret; | |
4992 | ||
4993 | again: | |
4994 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
4995 | if (ret == -ENOENT && tries++ < 1) { | |
4996 | ret = ceph_monc_do_get_version(&rbdc->client->monc, "osdmap", | |
4997 | &newest_epoch); | |
4998 | if (ret < 0) | |
4999 | return ret; | |
5000 | ||
5001 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
5002 | ceph_monc_request_next_osdmap(&rbdc->client->monc); | |
5003 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, | |
5004 | newest_epoch, timeout); | |
5005 | goto again; | |
5006 | } else { | |
5007 | /* the osdmap we have is new enough */ | |
5008 | return -ENOENT; | |
5009 | } | |
5010 | } | |
5011 | ||
5012 | return ret; | |
5013 | } | |
5014 | ||
589d30e0 AE |
5015 | /* |
5016 | * An rbd format 2 image has a unique identifier, distinct from the | |
5017 | * name given to it by the user. Internally, that identifier is | |
5018 | * what's used to specify the names of objects related to the image. | |
5019 | * | |
5020 | * A special "rbd id" object is used to map an rbd image name to its | |
5021 | * id. If that object doesn't exist, then there is no v2 rbd image | |
5022 | * with the supplied name. | |
5023 | * | |
5024 | * This function will record the given rbd_dev's image_id field if | |
5025 | * it can be determined, and in that case will return 0. If any | |
5026 | * errors occur a negative errno will be returned and the rbd_dev's | |
5027 | * image_id field will be unchanged (and should be NULL). | |
5028 | */ | |
5029 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
5030 | { | |
5031 | int ret; | |
5032 | size_t size; | |
5033 | char *object_name; | |
5034 | void *response; | |
c0fba368 | 5035 | char *image_id; |
2f82ee54 | 5036 | |
2c0d0a10 AE |
5037 | /* |
5038 | * When probing a parent image, the image id is already | |
5039 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
5040 | * need to fetch the image id again in this case. We |
5041 | * do still need to set the image format though. | |
2c0d0a10 | 5042 | */ |
c0fba368 AE |
5043 | if (rbd_dev->spec->image_id) { |
5044 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
5045 | ||
2c0d0a10 | 5046 | return 0; |
c0fba368 | 5047 | } |
2c0d0a10 | 5048 | |
589d30e0 AE |
5049 | /* |
5050 | * First, see if the format 2 image id file exists, and if | |
5051 | * so, get the image's persistent id from it. | |
5052 | */ | |
69e7a02f | 5053 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
5054 | object_name = kmalloc(size, GFP_NOIO); |
5055 | if (!object_name) | |
5056 | return -ENOMEM; | |
0d7dbfce | 5057 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
5058 | dout("rbd id object name is %s\n", object_name); |
5059 | ||
5060 | /* Response will be an encoded string, which includes a length */ | |
5061 | ||
5062 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
5063 | response = kzalloc(size, GFP_NOIO); | |
5064 | if (!response) { | |
5065 | ret = -ENOMEM; | |
5066 | goto out; | |
5067 | } | |
5068 | ||
c0fba368 AE |
5069 | /* If it doesn't exist we'll assume it's a format 1 image */ |
5070 | ||
36be9a76 | 5071 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 5072 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 5073 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 5074 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
5075 | if (ret == -ENOENT) { |
5076 | image_id = kstrdup("", GFP_KERNEL); | |
5077 | ret = image_id ? 0 : -ENOMEM; | |
5078 | if (!ret) | |
5079 | rbd_dev->image_format = 1; | |
7dd440c9 | 5080 | } else if (ret >= 0) { |
c0fba368 AE |
5081 | void *p = response; |
5082 | ||
5083 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 5084 | NULL, GFP_NOIO); |
461f758a | 5085 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
5086 | if (!ret) |
5087 | rbd_dev->image_format = 2; | |
c0fba368 AE |
5088 | } |
5089 | ||
5090 | if (!ret) { | |
5091 | rbd_dev->spec->image_id = image_id; | |
5092 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
5093 | } |
5094 | out: | |
5095 | kfree(response); | |
5096 | kfree(object_name); | |
5097 | ||
5098 | return ret; | |
5099 | } | |
5100 | ||
3abef3b3 AE |
5101 | /* |
5102 | * Undo whatever state changes are made by v1 or v2 header info | |
5103 | * call. | |
5104 | */ | |
6fd48b3b AE |
5105 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
5106 | { | |
5107 | struct rbd_image_header *header; | |
5108 | ||
e69b8d41 | 5109 | rbd_dev_parent_put(rbd_dev); |
6fd48b3b AE |
5110 | |
5111 | /* Free dynamic fields from the header, then zero it out */ | |
5112 | ||
5113 | header = &rbd_dev->header; | |
812164f8 | 5114 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
5115 | kfree(header->snap_sizes); |
5116 | kfree(header->snap_names); | |
5117 | kfree(header->object_prefix); | |
5118 | memset(header, 0, sizeof (*header)); | |
5119 | } | |
5120 | ||
2df3fac7 | 5121 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
5122 | { |
5123 | int ret; | |
a30b71b9 | 5124 | |
1e130199 | 5125 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 5126 | if (ret) |
b1b5402a AE |
5127 | goto out_err; |
5128 | ||
2df3fac7 AE |
5129 | /* |
5130 | * Get the and check features for the image. Currently the | |
5131 | * features are assumed to never change. | |
5132 | */ | |
b1b5402a | 5133 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 5134 | if (ret) |
9d475de5 | 5135 | goto out_err; |
35d489f9 | 5136 | |
cc070d59 AE |
5137 | /* If the image supports fancy striping, get its parameters */ |
5138 | ||
5139 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
5140 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
5141 | if (ret < 0) | |
5142 | goto out_err; | |
5143 | } | |
2df3fac7 | 5144 | /* No support for crypto and compression type format 2 images */ |
a30b71b9 | 5145 | |
35152979 | 5146 | return 0; |
9d475de5 | 5147 | out_err: |
642a2537 | 5148 | rbd_dev->header.features = 0; |
1e130199 AE |
5149 | kfree(rbd_dev->header.object_prefix); |
5150 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
5151 | |
5152 | return ret; | |
a30b71b9 AE |
5153 | } |
5154 | ||
124afba2 | 5155 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 5156 | { |
2f82ee54 | 5157 | struct rbd_device *parent = NULL; |
124afba2 AE |
5158 | struct rbd_spec *parent_spec; |
5159 | struct rbd_client *rbdc; | |
5160 | int ret; | |
5161 | ||
5162 | if (!rbd_dev->parent_spec) | |
5163 | return 0; | |
5164 | /* | |
5165 | * We need to pass a reference to the client and the parent | |
5166 | * spec when creating the parent rbd_dev. Images related by | |
5167 | * parent/child relationships always share both. | |
5168 | */ | |
5169 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
5170 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
5171 | ||
5172 | ret = -ENOMEM; | |
5173 | parent = rbd_dev_create(rbdc, parent_spec); | |
5174 | if (!parent) | |
5175 | goto out_err; | |
5176 | ||
1f3ef788 | 5177 | ret = rbd_dev_image_probe(parent, false); |
124afba2 AE |
5178 | if (ret < 0) |
5179 | goto out_err; | |
5180 | rbd_dev->parent = parent; | |
a2acd00e | 5181 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 AE |
5182 | |
5183 | return 0; | |
5184 | out_err: | |
5185 | if (parent) { | |
fb65d228 | 5186 | rbd_dev_unparent(rbd_dev); |
124afba2 AE |
5187 | kfree(rbd_dev->header_name); |
5188 | rbd_dev_destroy(parent); | |
5189 | } else { | |
5190 | rbd_put_client(rbdc); | |
5191 | rbd_spec_put(parent_spec); | |
5192 | } | |
5193 | ||
5194 | return ret; | |
5195 | } | |
5196 | ||
200a6a8b | 5197 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5198 | { |
83a06263 | 5199 | int ret; |
d1cf5788 | 5200 | |
f8a22fc2 ID |
5201 | /* Get an id and fill in device name. */ |
5202 | ||
5203 | ret = rbd_dev_id_get(rbd_dev); | |
5204 | if (ret) | |
5205 | return ret; | |
83a06263 | 5206 | |
83a06263 AE |
5207 | BUILD_BUG_ON(DEV_NAME_LEN |
5208 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
5209 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
5210 | ||
9b60e70b | 5211 | /* Record our major and minor device numbers. */ |
83a06263 | 5212 | |
9b60e70b ID |
5213 | if (!single_major) { |
5214 | ret = register_blkdev(0, rbd_dev->name); | |
5215 | if (ret < 0) | |
5216 | goto err_out_id; | |
5217 | ||
5218 | rbd_dev->major = ret; | |
5219 | rbd_dev->minor = 0; | |
5220 | } else { | |
5221 | rbd_dev->major = rbd_major; | |
5222 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5223 | } | |
83a06263 AE |
5224 | |
5225 | /* Set up the blkdev mapping. */ | |
5226 | ||
5227 | ret = rbd_init_disk(rbd_dev); | |
5228 | if (ret) | |
5229 | goto err_out_blkdev; | |
5230 | ||
f35a4dee | 5231 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5232 | if (ret) |
5233 | goto err_out_disk; | |
bc1ecc65 | 5234 | |
f35a4dee | 5235 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
22001f61 | 5236 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
f35a4dee AE |
5237 | |
5238 | ret = rbd_bus_add_dev(rbd_dev); | |
5239 | if (ret) | |
f5ee37bd | 5240 | goto err_out_mapping; |
83a06263 | 5241 | |
83a06263 AE |
5242 | /* Everything's ready. Announce the disk to the world. */ |
5243 | ||
129b79d4 | 5244 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
5245 | add_disk(rbd_dev->disk); |
5246 | ||
5247 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
5248 | (unsigned long long) rbd_dev->mapping.size); | |
5249 | ||
5250 | return ret; | |
2f82ee54 | 5251 | |
f35a4dee AE |
5252 | err_out_mapping: |
5253 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5254 | err_out_disk: |
5255 | rbd_free_disk(rbd_dev); | |
5256 | err_out_blkdev: | |
9b60e70b ID |
5257 | if (!single_major) |
5258 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
83a06263 AE |
5259 | err_out_id: |
5260 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 5261 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
5262 | |
5263 | return ret; | |
5264 | } | |
5265 | ||
332bb12d AE |
5266 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5267 | { | |
5268 | struct rbd_spec *spec = rbd_dev->spec; | |
5269 | size_t size; | |
5270 | ||
5271 | /* Record the header object name for this rbd image. */ | |
5272 | ||
5273 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5274 | ||
5275 | if (rbd_dev->image_format == 1) | |
5276 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
5277 | else | |
5278 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
5279 | ||
5280 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
5281 | if (!rbd_dev->header_name) | |
5282 | return -ENOMEM; | |
5283 | ||
5284 | if (rbd_dev->image_format == 1) | |
5285 | sprintf(rbd_dev->header_name, "%s%s", | |
5286 | spec->image_name, RBD_SUFFIX); | |
5287 | else | |
5288 | sprintf(rbd_dev->header_name, "%s%s", | |
5289 | RBD_HEADER_PREFIX, spec->image_id); | |
5290 | return 0; | |
5291 | } | |
5292 | ||
200a6a8b AE |
5293 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5294 | { | |
6fd48b3b | 5295 | rbd_dev_unprobe(rbd_dev); |
200a6a8b | 5296 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
5297 | rbd_dev->header_name = NULL; |
5298 | rbd_dev->image_format = 0; | |
5299 | kfree(rbd_dev->spec->image_id); | |
5300 | rbd_dev->spec->image_id = NULL; | |
5301 | ||
200a6a8b AE |
5302 | rbd_dev_destroy(rbd_dev); |
5303 | } | |
5304 | ||
a30b71b9 AE |
5305 | /* |
5306 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5307 | * device. If this image is the one being mapped (i.e., not a |
5308 | * parent), initiate a watch on its header object before using that | |
5309 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5310 | */ |
1f3ef788 | 5311 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping) |
a30b71b9 AE |
5312 | { |
5313 | int ret; | |
5314 | ||
5315 | /* | |
3abef3b3 AE |
5316 | * Get the id from the image id object. Unless there's an |
5317 | * error, rbd_dev->spec->image_id will be filled in with | |
5318 | * a dynamically-allocated string, and rbd_dev->image_format | |
5319 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5320 | */ |
5321 | ret = rbd_dev_image_id(rbd_dev); | |
5322 | if (ret) | |
c0fba368 | 5323 | return ret; |
c0fba368 | 5324 | |
332bb12d AE |
5325 | ret = rbd_dev_header_name(rbd_dev); |
5326 | if (ret) | |
5327 | goto err_out_format; | |
5328 | ||
1f3ef788 | 5329 | if (mapping) { |
fca27065 | 5330 | ret = rbd_dev_header_watch_sync(rbd_dev); |
1f3ef788 AE |
5331 | if (ret) |
5332 | goto out_header_name; | |
5333 | } | |
b644de2b | 5334 | |
a720ae09 | 5335 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5336 | if (ret) |
b644de2b | 5337 | goto err_out_watch; |
83a06263 | 5338 | |
04077599 ID |
5339 | /* |
5340 | * If this image is the one being mapped, we have pool name and | |
5341 | * id, image name and id, and snap name - need to fill snap id. | |
5342 | * Otherwise this is a parent image, identified by pool, image | |
5343 | * and snap ids - need to fill in names for those ids. | |
5344 | */ | |
5345 | if (mapping) | |
5346 | ret = rbd_spec_fill_snap_id(rbd_dev); | |
5347 | else | |
5348 | ret = rbd_spec_fill_names(rbd_dev); | |
9bb81c9b | 5349 | if (ret) |
33dca39f | 5350 | goto err_out_probe; |
9bb81c9b | 5351 | |
e8f59b59 ID |
5352 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5353 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5354 | if (ret) | |
5355 | goto err_out_probe; | |
5356 | ||
5357 | /* | |
5358 | * Need to warn users if this image is the one being | |
5359 | * mapped and has a parent. | |
5360 | */ | |
5361 | if (mapping && rbd_dev->parent_spec) | |
5362 | rbd_warn(rbd_dev, | |
5363 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5364 | } | |
5365 | ||
9bb81c9b | 5366 | ret = rbd_dev_probe_parent(rbd_dev); |
30d60ba2 AE |
5367 | if (ret) |
5368 | goto err_out_probe; | |
5369 | ||
5370 | dout("discovered format %u image, header name is %s\n", | |
5371 | rbd_dev->image_format, rbd_dev->header_name); | |
30d60ba2 | 5372 | return 0; |
e8f59b59 | 5373 | |
6fd48b3b AE |
5374 | err_out_probe: |
5375 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5376 | err_out_watch: |
fca27065 ID |
5377 | if (mapping) |
5378 | rbd_dev_header_unwatch_sync(rbd_dev); | |
332bb12d AE |
5379 | out_header_name: |
5380 | kfree(rbd_dev->header_name); | |
5381 | rbd_dev->header_name = NULL; | |
5382 | err_out_format: | |
5383 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5384 | kfree(rbd_dev->spec->image_id); |
5385 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5386 | return ret; |
5387 | } | |
5388 | ||
9b60e70b ID |
5389 | static ssize_t do_rbd_add(struct bus_type *bus, |
5390 | const char *buf, | |
5391 | size_t count) | |
602adf40 | 5392 | { |
cb8627c7 | 5393 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5394 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5395 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5396 | struct rbd_spec *spec = NULL; |
9d3997fd | 5397 | struct rbd_client *rbdc; |
51344a38 | 5398 | bool read_only; |
27cc2594 | 5399 | int rc = -ENOMEM; |
602adf40 YS |
5400 | |
5401 | if (!try_module_get(THIS_MODULE)) | |
5402 | return -ENODEV; | |
5403 | ||
602adf40 | 5404 | /* parse add command */ |
859c31df | 5405 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5406 | if (rc < 0) |
bd4ba655 | 5407 | goto err_out_module; |
51344a38 AE |
5408 | read_only = rbd_opts->read_only; |
5409 | kfree(rbd_opts); | |
5410 | rbd_opts = NULL; /* done with this */ | |
78cea76e | 5411 | |
9d3997fd AE |
5412 | rbdc = rbd_get_client(ceph_opts); |
5413 | if (IS_ERR(rbdc)) { | |
5414 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5415 | goto err_out_args; |
9d3997fd | 5416 | } |
602adf40 | 5417 | |
602adf40 | 5418 | /* pick the pool */ |
30ba1f02 | 5419 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
602adf40 YS |
5420 | if (rc < 0) |
5421 | goto err_out_client; | |
c0cd10db | 5422 | spec->pool_id = (u64)rc; |
859c31df | 5423 | |
0903e875 AE |
5424 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5425 | ||
c0cd10db | 5426 | if (spec->pool_id > (u64)U32_MAX) { |
9584d508 | 5427 | rbd_warn(NULL, "pool id too large (%llu > %u)", |
c0cd10db | 5428 | (unsigned long long)spec->pool_id, U32_MAX); |
0903e875 AE |
5429 | rc = -EIO; |
5430 | goto err_out_client; | |
5431 | } | |
5432 | ||
c53d5893 | 5433 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
5434 | if (!rbd_dev) |
5435 | goto err_out_client; | |
c53d5893 AE |
5436 | rbdc = NULL; /* rbd_dev now owns this */ |
5437 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 5438 | |
1f3ef788 | 5439 | rc = rbd_dev_image_probe(rbd_dev, true); |
a30b71b9 | 5440 | if (rc < 0) |
c53d5893 | 5441 | goto err_out_rbd_dev; |
05fd6f6f | 5442 | |
7ce4eef7 AE |
5443 | /* If we are mapping a snapshot it must be marked read-only */ |
5444 | ||
5445 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) | |
5446 | read_only = true; | |
5447 | rbd_dev->mapping.read_only = read_only; | |
5448 | ||
b536f69a | 5449 | rc = rbd_dev_device_setup(rbd_dev); |
3abef3b3 | 5450 | if (rc) { |
e37180c0 ID |
5451 | /* |
5452 | * rbd_dev_header_unwatch_sync() can't be moved into | |
5453 | * rbd_dev_image_release() without refactoring, see | |
5454 | * commit 1f3ef78861ac. | |
5455 | */ | |
5456 | rbd_dev_header_unwatch_sync(rbd_dev); | |
3abef3b3 AE |
5457 | rbd_dev_image_release(rbd_dev); |
5458 | goto err_out_module; | |
5459 | } | |
5460 | ||
5461 | return count; | |
b536f69a | 5462 | |
c53d5893 AE |
5463 | err_out_rbd_dev: |
5464 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5465 | err_out_client: |
9d3997fd | 5466 | rbd_put_client(rbdc); |
0ddebc0c | 5467 | err_out_args: |
859c31df | 5468 | rbd_spec_put(spec); |
bd4ba655 AE |
5469 | err_out_module: |
5470 | module_put(THIS_MODULE); | |
27cc2594 | 5471 | |
602adf40 | 5472 | dout("Error adding device %s\n", buf); |
27cc2594 | 5473 | |
c0cd10db | 5474 | return (ssize_t)rc; |
602adf40 YS |
5475 | } |
5476 | ||
9b60e70b ID |
5477 | static ssize_t rbd_add(struct bus_type *bus, |
5478 | const char *buf, | |
5479 | size_t count) | |
5480 | { | |
5481 | if (single_major) | |
5482 | return -EINVAL; | |
5483 | ||
5484 | return do_rbd_add(bus, buf, count); | |
5485 | } | |
5486 | ||
5487 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5488 | const char *buf, | |
5489 | size_t count) | |
5490 | { | |
5491 | return do_rbd_add(bus, buf, count); | |
5492 | } | |
5493 | ||
200a6a8b | 5494 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 5495 | { |
593a9e7b | 5496 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 5497 | |
602adf40 | 5498 | rbd_free_disk(rbd_dev); |
200a6a8b | 5499 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
6d80b130 | 5500 | rbd_dev_mapping_clear(rbd_dev); |
9b60e70b ID |
5501 | if (!single_major) |
5502 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
e2839308 | 5503 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 5504 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
5505 | } |
5506 | ||
05a46afd AE |
5507 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5508 | { | |
ad945fc1 | 5509 | while (rbd_dev->parent) { |
05a46afd AE |
5510 | struct rbd_device *first = rbd_dev; |
5511 | struct rbd_device *second = first->parent; | |
5512 | struct rbd_device *third; | |
5513 | ||
5514 | /* | |
5515 | * Follow to the parent with no grandparent and | |
5516 | * remove it. | |
5517 | */ | |
5518 | while (second && (third = second->parent)) { | |
5519 | first = second; | |
5520 | second = third; | |
5521 | } | |
ad945fc1 | 5522 | rbd_assert(second); |
8ad42cd0 | 5523 | rbd_dev_image_release(second); |
ad945fc1 AE |
5524 | first->parent = NULL; |
5525 | first->parent_overlap = 0; | |
5526 | ||
5527 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5528 | rbd_spec_put(first->parent_spec); |
5529 | first->parent_spec = NULL; | |
05a46afd AE |
5530 | } |
5531 | } | |
5532 | ||
9b60e70b ID |
5533 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5534 | const char *buf, | |
5535 | size_t count) | |
602adf40 YS |
5536 | { |
5537 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5538 | struct list_head *tmp; |
5539 | int dev_id; | |
602adf40 | 5540 | unsigned long ul; |
82a442d2 | 5541 | bool already = false; |
0d8189e1 | 5542 | int ret; |
602adf40 | 5543 | |
bb8e0e84 | 5544 | ret = kstrtoul(buf, 10, &ul); |
0d8189e1 AE |
5545 | if (ret) |
5546 | return ret; | |
602adf40 YS |
5547 | |
5548 | /* convert to int; abort if we lost anything in the conversion */ | |
751cc0e3 AE |
5549 | dev_id = (int)ul; |
5550 | if (dev_id != ul) | |
602adf40 YS |
5551 | return -EINVAL; |
5552 | ||
751cc0e3 AE |
5553 | ret = -ENOENT; |
5554 | spin_lock(&rbd_dev_list_lock); | |
5555 | list_for_each(tmp, &rbd_dev_list) { | |
5556 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5557 | if (rbd_dev->dev_id == dev_id) { | |
5558 | ret = 0; | |
5559 | break; | |
5560 | } | |
42382b70 | 5561 | } |
751cc0e3 AE |
5562 | if (!ret) { |
5563 | spin_lock_irq(&rbd_dev->lock); | |
5564 | if (rbd_dev->open_count) | |
5565 | ret = -EBUSY; | |
5566 | else | |
82a442d2 AE |
5567 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5568 | &rbd_dev->flags); | |
751cc0e3 AE |
5569 | spin_unlock_irq(&rbd_dev->lock); |
5570 | } | |
5571 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5572 | if (ret < 0 || already) |
1ba0f1e7 | 5573 | return ret; |
751cc0e3 | 5574 | |
fca27065 | 5575 | rbd_dev_header_unwatch_sync(rbd_dev); |
9abc5990 JD |
5576 | /* |
5577 | * flush remaining watch callbacks - these must be complete | |
5578 | * before the osd_client is shutdown | |
5579 | */ | |
5580 | dout("%s: flushing notifies", __func__); | |
5581 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); | |
fca27065 | 5582 | |
9875201e JD |
5583 | /* |
5584 | * Don't free anything from rbd_dev->disk until after all | |
5585 | * notifies are completely processed. Otherwise | |
5586 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting | |
5587 | * in a potential use after free of rbd_dev->disk or rbd_dev. | |
5588 | */ | |
5589 | rbd_bus_del_dev(rbd_dev); | |
8ad42cd0 | 5590 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 5591 | module_put(THIS_MODULE); |
aafb230e | 5592 | |
1ba0f1e7 | 5593 | return count; |
602adf40 YS |
5594 | } |
5595 | ||
9b60e70b ID |
5596 | static ssize_t rbd_remove(struct bus_type *bus, |
5597 | const char *buf, | |
5598 | size_t count) | |
5599 | { | |
5600 | if (single_major) | |
5601 | return -EINVAL; | |
5602 | ||
5603 | return do_rbd_remove(bus, buf, count); | |
5604 | } | |
5605 | ||
5606 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5607 | const char *buf, | |
5608 | size_t count) | |
5609 | { | |
5610 | return do_rbd_remove(bus, buf, count); | |
5611 | } | |
5612 | ||
602adf40 YS |
5613 | /* |
5614 | * create control files in sysfs | |
dfc5606d | 5615 | * /sys/bus/rbd/... |
602adf40 YS |
5616 | */ |
5617 | static int rbd_sysfs_init(void) | |
5618 | { | |
dfc5606d | 5619 | int ret; |
602adf40 | 5620 | |
fed4c143 | 5621 | ret = device_register(&rbd_root_dev); |
21079786 | 5622 | if (ret < 0) |
dfc5606d | 5623 | return ret; |
602adf40 | 5624 | |
fed4c143 AE |
5625 | ret = bus_register(&rbd_bus_type); |
5626 | if (ret < 0) | |
5627 | device_unregister(&rbd_root_dev); | |
602adf40 | 5628 | |
602adf40 YS |
5629 | return ret; |
5630 | } | |
5631 | ||
5632 | static void rbd_sysfs_cleanup(void) | |
5633 | { | |
dfc5606d | 5634 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5635 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5636 | } |
5637 | ||
1c2a9dfe AE |
5638 | static int rbd_slab_init(void) |
5639 | { | |
5640 | rbd_assert(!rbd_img_request_cache); | |
5641 | rbd_img_request_cache = kmem_cache_create("rbd_img_request", | |
5642 | sizeof (struct rbd_img_request), | |
5643 | __alignof__(struct rbd_img_request), | |
5644 | 0, NULL); | |
868311b1 AE |
5645 | if (!rbd_img_request_cache) |
5646 | return -ENOMEM; | |
5647 | ||
5648 | rbd_assert(!rbd_obj_request_cache); | |
5649 | rbd_obj_request_cache = kmem_cache_create("rbd_obj_request", | |
5650 | sizeof (struct rbd_obj_request), | |
5651 | __alignof__(struct rbd_obj_request), | |
5652 | 0, NULL); | |
78c2a44a AE |
5653 | if (!rbd_obj_request_cache) |
5654 | goto out_err; | |
5655 | ||
5656 | rbd_assert(!rbd_segment_name_cache); | |
5657 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
2d0ebc5d | 5658 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
78c2a44a | 5659 | if (rbd_segment_name_cache) |
1c2a9dfe | 5660 | return 0; |
78c2a44a AE |
5661 | out_err: |
5662 | if (rbd_obj_request_cache) { | |
5663 | kmem_cache_destroy(rbd_obj_request_cache); | |
5664 | rbd_obj_request_cache = NULL; | |
5665 | } | |
1c2a9dfe | 5666 | |
868311b1 AE |
5667 | kmem_cache_destroy(rbd_img_request_cache); |
5668 | rbd_img_request_cache = NULL; | |
5669 | ||
1c2a9dfe AE |
5670 | return -ENOMEM; |
5671 | } | |
5672 | ||
5673 | static void rbd_slab_exit(void) | |
5674 | { | |
78c2a44a AE |
5675 | rbd_assert(rbd_segment_name_cache); |
5676 | kmem_cache_destroy(rbd_segment_name_cache); | |
5677 | rbd_segment_name_cache = NULL; | |
5678 | ||
868311b1 AE |
5679 | rbd_assert(rbd_obj_request_cache); |
5680 | kmem_cache_destroy(rbd_obj_request_cache); | |
5681 | rbd_obj_request_cache = NULL; | |
5682 | ||
1c2a9dfe AE |
5683 | rbd_assert(rbd_img_request_cache); |
5684 | kmem_cache_destroy(rbd_img_request_cache); | |
5685 | rbd_img_request_cache = NULL; | |
5686 | } | |
5687 | ||
cc344fa1 | 5688 | static int __init rbd_init(void) |
602adf40 YS |
5689 | { |
5690 | int rc; | |
5691 | ||
1e32d34c AE |
5692 | if (!libceph_compatible(NULL)) { |
5693 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5694 | return -EINVAL; |
5695 | } | |
e1b4d96d | 5696 | |
1c2a9dfe | 5697 | rc = rbd_slab_init(); |
602adf40 YS |
5698 | if (rc) |
5699 | return rc; | |
e1b4d96d | 5700 | |
f5ee37bd ID |
5701 | /* |
5702 | * The number of active work items is limited by the number of | |
5703 | * rbd devices, so leave @max_active at default. | |
5704 | */ | |
5705 | rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); | |
5706 | if (!rbd_wq) { | |
5707 | rc = -ENOMEM; | |
5708 | goto err_out_slab; | |
5709 | } | |
5710 | ||
9b60e70b ID |
5711 | if (single_major) { |
5712 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5713 | if (rbd_major < 0) { | |
5714 | rc = rbd_major; | |
f5ee37bd | 5715 | goto err_out_wq; |
9b60e70b ID |
5716 | } |
5717 | } | |
5718 | ||
1c2a9dfe AE |
5719 | rc = rbd_sysfs_init(); |
5720 | if (rc) | |
9b60e70b ID |
5721 | goto err_out_blkdev; |
5722 | ||
5723 | if (single_major) | |
5724 | pr_info("loaded (major %d)\n", rbd_major); | |
5725 | else | |
5726 | pr_info("loaded\n"); | |
1c2a9dfe | 5727 | |
e1b4d96d ID |
5728 | return 0; |
5729 | ||
9b60e70b ID |
5730 | err_out_blkdev: |
5731 | if (single_major) | |
5732 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd ID |
5733 | err_out_wq: |
5734 | destroy_workqueue(rbd_wq); | |
e1b4d96d ID |
5735 | err_out_slab: |
5736 | rbd_slab_exit(); | |
1c2a9dfe | 5737 | return rc; |
602adf40 YS |
5738 | } |
5739 | ||
cc344fa1 | 5740 | static void __exit rbd_exit(void) |
602adf40 | 5741 | { |
ffe312cf | 5742 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 5743 | rbd_sysfs_cleanup(); |
9b60e70b ID |
5744 | if (single_major) |
5745 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
f5ee37bd | 5746 | destroy_workqueue(rbd_wq); |
1c2a9dfe | 5747 | rbd_slab_exit(); |
602adf40 YS |
5748 | } |
5749 | ||
5750 | module_init(rbd_init); | |
5751 | module_exit(rbd_exit); | |
5752 | ||
d552c619 | 5753 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
5754 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
5755 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
5756 | /* following authorship retained from original osdblk.c */ |
5757 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5758 | ||
90da258b | 5759 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 5760 | MODULE_LICENSE("GPL"); |