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Commit | Line | Data |
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e2a58ee5 | 1 | |
602adf40 YS |
2 | /* |
3 | rbd.c -- Export ceph rados objects as a Linux block device | |
4 | ||
5 | ||
6 | based on drivers/block/osdblk.c: | |
7 | ||
8 | Copyright 2009 Red Hat, Inc. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; see the file COPYING. If not, write to | |
21 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ||
24 | ||
dfc5606d | 25 | For usage instructions, please refer to: |
602adf40 | 26 | |
dfc5606d | 27 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
28 | |
29 | */ | |
30 | ||
31 | #include <linux/ceph/libceph.h> | |
32 | #include <linux/ceph/osd_client.h> | |
33 | #include <linux/ceph/mon_client.h> | |
34 | #include <linux/ceph/decode.h> | |
59c2be1e | 35 | #include <linux/parser.h> |
30d1cff8 | 36 | #include <linux/bsearch.h> |
602adf40 YS |
37 | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/blkdev.h> | |
1c2a9dfe | 43 | #include <linux/slab.h> |
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 | |
926f9b3f AE |
213 | enum obj_req_flags { |
214 | OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ | |
6365d33a | 215 | OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
5679c59f AE |
216 | OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
217 | OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ | |
926f9b3f AE |
218 | }; |
219 | ||
bf0d5f50 AE |
220 | struct rbd_obj_request { |
221 | const char *object_name; | |
222 | u64 offset; /* object start byte */ | |
223 | u64 length; /* bytes from offset */ | |
926f9b3f | 224 | unsigned long flags; |
bf0d5f50 | 225 | |
c5b5ef6c AE |
226 | /* |
227 | * An object request associated with an image will have its | |
228 | * img_data flag set; a standalone object request will not. | |
229 | * | |
230 | * A standalone object request will have which == BAD_WHICH | |
231 | * and a null obj_request pointer. | |
232 | * | |
233 | * An object request initiated in support of a layered image | |
234 | * object (to check for its existence before a write) will | |
235 | * have which == BAD_WHICH and a non-null obj_request pointer. | |
236 | * | |
237 | * Finally, an object request for rbd image data will have | |
238 | * which != BAD_WHICH, and will have a non-null img_request | |
239 | * pointer. The value of which will be in the range | |
240 | * 0..(img_request->obj_request_count-1). | |
241 | */ | |
242 | union { | |
243 | struct rbd_obj_request *obj_request; /* STAT op */ | |
244 | struct { | |
245 | struct rbd_img_request *img_request; | |
246 | u64 img_offset; | |
247 | /* links for img_request->obj_requests list */ | |
248 | struct list_head links; | |
249 | }; | |
250 | }; | |
bf0d5f50 AE |
251 | u32 which; /* posn image request list */ |
252 | ||
253 | enum obj_request_type type; | |
788e2df3 AE |
254 | union { |
255 | struct bio *bio_list; | |
256 | struct { | |
257 | struct page **pages; | |
258 | u32 page_count; | |
259 | }; | |
260 | }; | |
0eefd470 | 261 | struct page **copyup_pages; |
ebda6408 | 262 | u32 copyup_page_count; |
bf0d5f50 AE |
263 | |
264 | struct ceph_osd_request *osd_req; | |
265 | ||
266 | u64 xferred; /* bytes transferred */ | |
1b83bef2 | 267 | int result; |
bf0d5f50 AE |
268 | |
269 | rbd_obj_callback_t callback; | |
788e2df3 | 270 | struct completion completion; |
bf0d5f50 AE |
271 | |
272 | struct kref kref; | |
273 | }; | |
274 | ||
0c425248 | 275 | enum img_req_flags { |
9849e986 AE |
276 | IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
277 | IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ | |
d0b2e944 | 278 | IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
0c425248 AE |
279 | }; |
280 | ||
bf0d5f50 | 281 | struct rbd_img_request { |
bf0d5f50 AE |
282 | struct rbd_device *rbd_dev; |
283 | u64 offset; /* starting image byte offset */ | |
284 | u64 length; /* byte count from offset */ | |
0c425248 | 285 | unsigned long flags; |
bf0d5f50 | 286 | union { |
9849e986 | 287 | u64 snap_id; /* for reads */ |
bf0d5f50 | 288 | struct ceph_snap_context *snapc; /* for writes */ |
9849e986 AE |
289 | }; |
290 | union { | |
291 | struct request *rq; /* block request */ | |
292 | struct rbd_obj_request *obj_request; /* obj req initiator */ | |
bf0d5f50 | 293 | }; |
3d7efd18 | 294 | struct page **copyup_pages; |
ebda6408 | 295 | u32 copyup_page_count; |
bf0d5f50 AE |
296 | spinlock_t completion_lock;/* protects next_completion */ |
297 | u32 next_completion; | |
298 | rbd_img_callback_t callback; | |
55f27e09 | 299 | u64 xferred;/* aggregate bytes transferred */ |
a5a337d4 | 300 | int result; /* first nonzero obj_request result */ |
bf0d5f50 AE |
301 | |
302 | u32 obj_request_count; | |
303 | struct list_head obj_requests; /* rbd_obj_request structs */ | |
304 | ||
305 | struct kref kref; | |
306 | }; | |
307 | ||
308 | #define for_each_obj_request(ireq, oreq) \ | |
ef06f4d3 | 309 | list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 310 | #define for_each_obj_request_from(ireq, oreq) \ |
ef06f4d3 | 311 | list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
bf0d5f50 | 312 | #define for_each_obj_request_safe(ireq, oreq, n) \ |
ef06f4d3 | 313 | list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
bf0d5f50 | 314 | |
f84344f3 | 315 | struct rbd_mapping { |
99c1f08f | 316 | u64 size; |
34b13184 | 317 | u64 features; |
f84344f3 AE |
318 | bool read_only; |
319 | }; | |
320 | ||
602adf40 YS |
321 | /* |
322 | * a single device | |
323 | */ | |
324 | struct rbd_device { | |
de71a297 | 325 | int dev_id; /* blkdev unique id */ |
602adf40 YS |
326 | |
327 | int major; /* blkdev assigned major */ | |
dd82fff1 | 328 | int minor; |
602adf40 | 329 | struct gendisk *disk; /* blkdev's gendisk and rq */ |
602adf40 | 330 | |
a30b71b9 | 331 | u32 image_format; /* Either 1 or 2 */ |
602adf40 YS |
332 | struct rbd_client *rbd_client; |
333 | ||
334 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
335 | ||
bc1ecc65 | 336 | struct list_head rq_queue; /* incoming rq queue */ |
b82d167b | 337 | spinlock_t lock; /* queue, flags, open_count */ |
bc1ecc65 ID |
338 | struct workqueue_struct *rq_wq; |
339 | struct work_struct rq_work; | |
602adf40 YS |
340 | |
341 | struct rbd_image_header header; | |
b82d167b | 342 | unsigned long flags; /* possibly lock protected */ |
0d7dbfce | 343 | struct rbd_spec *spec; |
602adf40 | 344 | |
0d7dbfce | 345 | char *header_name; |
971f839a | 346 | |
0903e875 AE |
347 | struct ceph_file_layout layout; |
348 | ||
59c2be1e | 349 | struct ceph_osd_event *watch_event; |
975241af | 350 | struct rbd_obj_request *watch_request; |
59c2be1e | 351 | |
86b00e0d AE |
352 | struct rbd_spec *parent_spec; |
353 | u64 parent_overlap; | |
a2acd00e | 354 | atomic_t parent_ref; |
2f82ee54 | 355 | struct rbd_device *parent; |
86b00e0d | 356 | |
c666601a JD |
357 | /* protects updating the header */ |
358 | struct rw_semaphore header_rwsem; | |
f84344f3 AE |
359 | |
360 | struct rbd_mapping mapping; | |
602adf40 YS |
361 | |
362 | struct list_head node; | |
dfc5606d | 363 | |
dfc5606d YS |
364 | /* sysfs related */ |
365 | struct device dev; | |
b82d167b | 366 | unsigned long open_count; /* protected by lock */ |
dfc5606d YS |
367 | }; |
368 | ||
b82d167b AE |
369 | /* |
370 | * Flag bits for rbd_dev->flags. If atomicity is required, | |
371 | * rbd_dev->lock is used to protect access. | |
372 | * | |
373 | * Currently, only the "removing" flag (which is coupled with the | |
374 | * "open_count" field) requires atomic access. | |
375 | */ | |
6d292906 AE |
376 | enum rbd_dev_flags { |
377 | RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ | |
b82d167b | 378 | RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
6d292906 AE |
379 | }; |
380 | ||
cfbf6377 | 381 | static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
e124a82f | 382 | |
602adf40 | 383 | static LIST_HEAD(rbd_dev_list); /* devices */ |
e124a82f AE |
384 | static DEFINE_SPINLOCK(rbd_dev_list_lock); |
385 | ||
432b8587 AE |
386 | static LIST_HEAD(rbd_client_list); /* clients */ |
387 | static DEFINE_SPINLOCK(rbd_client_list_lock); | |
602adf40 | 388 | |
78c2a44a AE |
389 | /* Slab caches for frequently-allocated structures */ |
390 | ||
1c2a9dfe | 391 | static struct kmem_cache *rbd_img_request_cache; |
868311b1 | 392 | static struct kmem_cache *rbd_obj_request_cache; |
78c2a44a | 393 | static struct kmem_cache *rbd_segment_name_cache; |
1c2a9dfe | 394 | |
9b60e70b | 395 | static int rbd_major; |
f8a22fc2 ID |
396 | static DEFINE_IDA(rbd_dev_id_ida); |
397 | ||
9b60e70b ID |
398 | /* |
399 | * Default to false for now, as single-major requires >= 0.75 version of | |
400 | * userspace rbd utility. | |
401 | */ | |
402 | static bool single_major = false; | |
403 | module_param(single_major, bool, S_IRUGO); | |
404 | MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); | |
405 | ||
3d7efd18 AE |
406 | static int rbd_img_request_submit(struct rbd_img_request *img_request); |
407 | ||
200a6a8b | 408 | static void rbd_dev_device_release(struct device *dev); |
dfc5606d | 409 | |
f0f8cef5 AE |
410 | static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
411 | size_t count); | |
412 | static ssize_t rbd_remove(struct bus_type *bus, const char *buf, | |
413 | size_t count); | |
9b60e70b ID |
414 | static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
415 | size_t count); | |
416 | static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, | |
417 | size_t count); | |
1f3ef788 | 418 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping); |
a2acd00e | 419 | static void rbd_spec_put(struct rbd_spec *spec); |
f0f8cef5 | 420 | |
9b60e70b ID |
421 | static int rbd_dev_id_to_minor(int dev_id) |
422 | { | |
7e513d43 | 423 | return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
424 | } |
425 | ||
426 | static int minor_to_rbd_dev_id(int minor) | |
427 | { | |
7e513d43 | 428 | return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
9b60e70b ID |
429 | } |
430 | ||
b15a21dd GKH |
431 | static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
432 | static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); | |
9b60e70b ID |
433 | static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
434 | static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); | |
b15a21dd GKH |
435 | |
436 | static struct attribute *rbd_bus_attrs[] = { | |
437 | &bus_attr_add.attr, | |
438 | &bus_attr_remove.attr, | |
9b60e70b ID |
439 | &bus_attr_add_single_major.attr, |
440 | &bus_attr_remove_single_major.attr, | |
b15a21dd | 441 | NULL, |
f0f8cef5 | 442 | }; |
92c76dc0 ID |
443 | |
444 | static umode_t rbd_bus_is_visible(struct kobject *kobj, | |
445 | struct attribute *attr, int index) | |
446 | { | |
9b60e70b ID |
447 | if (!single_major && |
448 | (attr == &bus_attr_add_single_major.attr || | |
449 | attr == &bus_attr_remove_single_major.attr)) | |
450 | return 0; | |
451 | ||
92c76dc0 ID |
452 | return attr->mode; |
453 | } | |
454 | ||
455 | static const struct attribute_group rbd_bus_group = { | |
456 | .attrs = rbd_bus_attrs, | |
457 | .is_visible = rbd_bus_is_visible, | |
458 | }; | |
459 | __ATTRIBUTE_GROUPS(rbd_bus); | |
f0f8cef5 AE |
460 | |
461 | static struct bus_type rbd_bus_type = { | |
462 | .name = "rbd", | |
b15a21dd | 463 | .bus_groups = rbd_bus_groups, |
f0f8cef5 AE |
464 | }; |
465 | ||
466 | static void rbd_root_dev_release(struct device *dev) | |
467 | { | |
468 | } | |
469 | ||
470 | static struct device rbd_root_dev = { | |
471 | .init_name = "rbd", | |
472 | .release = rbd_root_dev_release, | |
473 | }; | |
474 | ||
06ecc6cb AE |
475 | static __printf(2, 3) |
476 | void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) | |
477 | { | |
478 | struct va_format vaf; | |
479 | va_list args; | |
480 | ||
481 | va_start(args, fmt); | |
482 | vaf.fmt = fmt; | |
483 | vaf.va = &args; | |
484 | ||
485 | if (!rbd_dev) | |
486 | printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); | |
487 | else if (rbd_dev->disk) | |
488 | printk(KERN_WARNING "%s: %s: %pV\n", | |
489 | RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); | |
490 | else if (rbd_dev->spec && rbd_dev->spec->image_name) | |
491 | printk(KERN_WARNING "%s: image %s: %pV\n", | |
492 | RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); | |
493 | else if (rbd_dev->spec && rbd_dev->spec->image_id) | |
494 | printk(KERN_WARNING "%s: id %s: %pV\n", | |
495 | RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); | |
496 | else /* punt */ | |
497 | printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", | |
498 | RBD_DRV_NAME, rbd_dev, &vaf); | |
499 | va_end(args); | |
500 | } | |
501 | ||
aafb230e AE |
502 | #ifdef RBD_DEBUG |
503 | #define rbd_assert(expr) \ | |
504 | if (unlikely(!(expr))) { \ | |
505 | printk(KERN_ERR "\nAssertion failure in %s() " \ | |
506 | "at line %d:\n\n" \ | |
507 | "\trbd_assert(%s);\n\n", \ | |
508 | __func__, __LINE__, #expr); \ | |
509 | BUG(); \ | |
510 | } | |
511 | #else /* !RBD_DEBUG */ | |
512 | # define rbd_assert(expr) ((void) 0) | |
513 | #endif /* !RBD_DEBUG */ | |
dfc5606d | 514 | |
b454e36d | 515 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
05a46afd AE |
516 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
517 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); | |
8b3e1a56 | 518 | |
cc4a38bd | 519 | static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
2df3fac7 | 520 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
a720ae09 | 521 | static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
e8f59b59 | 522 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
54cac61f AE |
523 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
524 | u64 snap_id); | |
2ad3d716 AE |
525 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
526 | u8 *order, u64 *snap_size); | |
527 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, | |
528 | u64 *snap_features); | |
529 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name); | |
59c2be1e | 530 | |
602adf40 YS |
531 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
532 | { | |
f0f8cef5 | 533 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
b82d167b | 534 | bool removing = false; |
602adf40 | 535 | |
f84344f3 | 536 | if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
602adf40 YS |
537 | return -EROFS; |
538 | ||
a14ea269 | 539 | spin_lock_irq(&rbd_dev->lock); |
b82d167b AE |
540 | if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
541 | removing = true; | |
542 | else | |
543 | rbd_dev->open_count++; | |
a14ea269 | 544 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b AE |
545 | if (removing) |
546 | return -ENOENT; | |
547 | ||
c3e946ce | 548 | (void) get_device(&rbd_dev->dev); |
340c7a2b | 549 | |
602adf40 YS |
550 | return 0; |
551 | } | |
552 | ||
db2a144b | 553 | static void rbd_release(struct gendisk *disk, fmode_t mode) |
dfc5606d YS |
554 | { |
555 | struct rbd_device *rbd_dev = disk->private_data; | |
b82d167b AE |
556 | unsigned long open_count_before; |
557 | ||
a14ea269 | 558 | spin_lock_irq(&rbd_dev->lock); |
b82d167b | 559 | open_count_before = rbd_dev->open_count--; |
a14ea269 | 560 | spin_unlock_irq(&rbd_dev->lock); |
b82d167b | 561 | rbd_assert(open_count_before > 0); |
dfc5606d | 562 | |
c3e946ce | 563 | put_device(&rbd_dev->dev); |
dfc5606d YS |
564 | } |
565 | ||
131fd9f6 GZ |
566 | static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
567 | { | |
77f33c03 | 568 | int ret = 0; |
131fd9f6 GZ |
569 | int val; |
570 | bool ro; | |
77f33c03 | 571 | bool ro_changed = false; |
131fd9f6 | 572 | |
77f33c03 | 573 | /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
131fd9f6 GZ |
574 | if (get_user(val, (int __user *)(arg))) |
575 | return -EFAULT; | |
576 | ||
577 | ro = val ? true : false; | |
578 | /* Snapshot doesn't allow to write*/ | |
579 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) | |
580 | return -EROFS; | |
581 | ||
77f33c03 JD |
582 | spin_lock_irq(&rbd_dev->lock); |
583 | /* prevent others open this device */ | |
584 | if (rbd_dev->open_count > 1) { | |
585 | ret = -EBUSY; | |
586 | goto out; | |
587 | } | |
588 | ||
131fd9f6 GZ |
589 | if (rbd_dev->mapping.read_only != ro) { |
590 | rbd_dev->mapping.read_only = ro; | |
77f33c03 | 591 | ro_changed = true; |
131fd9f6 GZ |
592 | } |
593 | ||
77f33c03 JD |
594 | out: |
595 | spin_unlock_irq(&rbd_dev->lock); | |
596 | /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ | |
597 | if (ret == 0 && ro_changed) | |
598 | set_disk_ro(rbd_dev->disk, ro ? 1 : 0); | |
599 | ||
600 | return ret; | |
131fd9f6 GZ |
601 | } |
602 | ||
603 | static int rbd_ioctl(struct block_device *bdev, fmode_t mode, | |
604 | unsigned int cmd, unsigned long arg) | |
605 | { | |
606 | struct rbd_device *rbd_dev = bdev->bd_disk->private_data; | |
607 | int ret = 0; | |
608 | ||
131fd9f6 GZ |
609 | switch (cmd) { |
610 | case BLKROSET: | |
611 | ret = rbd_ioctl_set_ro(rbd_dev, arg); | |
612 | break; | |
613 | default: | |
614 | ret = -ENOTTY; | |
615 | } | |
616 | ||
131fd9f6 GZ |
617 | return ret; |
618 | } | |
619 | ||
620 | #ifdef CONFIG_COMPAT | |
621 | static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
622 | unsigned int cmd, unsigned long arg) | |
623 | { | |
624 | return rbd_ioctl(bdev, mode, cmd, arg); | |
625 | } | |
626 | #endif /* CONFIG_COMPAT */ | |
627 | ||
602adf40 YS |
628 | static const struct block_device_operations rbd_bd_ops = { |
629 | .owner = THIS_MODULE, | |
630 | .open = rbd_open, | |
dfc5606d | 631 | .release = rbd_release, |
131fd9f6 GZ |
632 | .ioctl = rbd_ioctl, |
633 | #ifdef CONFIG_COMPAT | |
634 | .compat_ioctl = rbd_compat_ioctl, | |
635 | #endif | |
602adf40 YS |
636 | }; |
637 | ||
638 | /* | |
7262cfca | 639 | * Initialize an rbd client instance. Success or not, this function |
cfbf6377 | 640 | * consumes ceph_opts. Caller holds client_mutex. |
602adf40 | 641 | */ |
f8c38929 | 642 | static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
602adf40 YS |
643 | { |
644 | struct rbd_client *rbdc; | |
645 | int ret = -ENOMEM; | |
646 | ||
37206ee5 | 647 | dout("%s:\n", __func__); |
602adf40 YS |
648 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
649 | if (!rbdc) | |
650 | goto out_opt; | |
651 | ||
652 | kref_init(&rbdc->kref); | |
653 | INIT_LIST_HEAD(&rbdc->node); | |
654 | ||
43ae4701 | 655 | rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
602adf40 | 656 | if (IS_ERR(rbdc->client)) |
08f75463 | 657 | goto out_rbdc; |
43ae4701 | 658 | ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
602adf40 YS |
659 | |
660 | ret = ceph_open_session(rbdc->client); | |
661 | if (ret < 0) | |
08f75463 | 662 | goto out_client; |
602adf40 | 663 | |
432b8587 | 664 | spin_lock(&rbd_client_list_lock); |
602adf40 | 665 | list_add_tail(&rbdc->node, &rbd_client_list); |
432b8587 | 666 | spin_unlock(&rbd_client_list_lock); |
602adf40 | 667 | |
37206ee5 | 668 | dout("%s: rbdc %p\n", __func__, rbdc); |
bc534d86 | 669 | |
602adf40 | 670 | return rbdc; |
08f75463 | 671 | out_client: |
602adf40 | 672 | ceph_destroy_client(rbdc->client); |
08f75463 | 673 | out_rbdc: |
602adf40 YS |
674 | kfree(rbdc); |
675 | out_opt: | |
43ae4701 AE |
676 | if (ceph_opts) |
677 | ceph_destroy_options(ceph_opts); | |
37206ee5 AE |
678 | dout("%s: error %d\n", __func__, ret); |
679 | ||
28f259b7 | 680 | return ERR_PTR(ret); |
602adf40 YS |
681 | } |
682 | ||
2f82ee54 AE |
683 | static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
684 | { | |
685 | kref_get(&rbdc->kref); | |
686 | ||
687 | return rbdc; | |
688 | } | |
689 | ||
602adf40 | 690 | /* |
1f7ba331 AE |
691 | * Find a ceph client with specific addr and configuration. If |
692 | * found, bump its reference count. | |
602adf40 | 693 | */ |
1f7ba331 | 694 | static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
602adf40 YS |
695 | { |
696 | struct rbd_client *client_node; | |
1f7ba331 | 697 | bool found = false; |
602adf40 | 698 | |
43ae4701 | 699 | if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
602adf40 YS |
700 | return NULL; |
701 | ||
1f7ba331 AE |
702 | spin_lock(&rbd_client_list_lock); |
703 | list_for_each_entry(client_node, &rbd_client_list, node) { | |
704 | if (!ceph_compare_options(ceph_opts, client_node->client)) { | |
2f82ee54 AE |
705 | __rbd_get_client(client_node); |
706 | ||
1f7ba331 AE |
707 | found = true; |
708 | break; | |
709 | } | |
710 | } | |
711 | spin_unlock(&rbd_client_list_lock); | |
712 | ||
713 | return found ? client_node : NULL; | |
602adf40 YS |
714 | } |
715 | ||
59c2be1e YS |
716 | /* |
717 | * mount options | |
718 | */ | |
719 | enum { | |
59c2be1e YS |
720 | Opt_last_int, |
721 | /* int args above */ | |
722 | Opt_last_string, | |
723 | /* string args above */ | |
cc0538b6 AE |
724 | Opt_read_only, |
725 | Opt_read_write, | |
726 | /* Boolean args above */ | |
727 | Opt_last_bool, | |
59c2be1e YS |
728 | }; |
729 | ||
43ae4701 | 730 | static match_table_t rbd_opts_tokens = { |
59c2be1e YS |
731 | /* int args above */ |
732 | /* string args above */ | |
be466c1c | 733 | {Opt_read_only, "read_only"}, |
cc0538b6 AE |
734 | {Opt_read_only, "ro"}, /* Alternate spelling */ |
735 | {Opt_read_write, "read_write"}, | |
736 | {Opt_read_write, "rw"}, /* Alternate spelling */ | |
737 | /* Boolean args above */ | |
59c2be1e YS |
738 | {-1, NULL} |
739 | }; | |
740 | ||
98571b5a AE |
741 | struct rbd_options { |
742 | bool read_only; | |
743 | }; | |
744 | ||
745 | #define RBD_READ_ONLY_DEFAULT false | |
746 | ||
59c2be1e YS |
747 | static int parse_rbd_opts_token(char *c, void *private) |
748 | { | |
43ae4701 | 749 | struct rbd_options *rbd_opts = private; |
59c2be1e YS |
750 | substring_t argstr[MAX_OPT_ARGS]; |
751 | int token, intval, ret; | |
752 | ||
43ae4701 | 753 | token = match_token(c, rbd_opts_tokens, argstr); |
59c2be1e YS |
754 | if (token < 0) |
755 | return -EINVAL; | |
756 | ||
757 | if (token < Opt_last_int) { | |
758 | ret = match_int(&argstr[0], &intval); | |
759 | if (ret < 0) { | |
760 | pr_err("bad mount option arg (not int) " | |
761 | "at '%s'\n", c); | |
762 | return ret; | |
763 | } | |
764 | dout("got int token %d val %d\n", token, intval); | |
765 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
766 | dout("got string token %d val %s\n", token, | |
767 | argstr[0].from); | |
cc0538b6 AE |
768 | } else if (token > Opt_last_string && token < Opt_last_bool) { |
769 | dout("got Boolean token %d\n", token); | |
59c2be1e YS |
770 | } else { |
771 | dout("got token %d\n", token); | |
772 | } | |
773 | ||
774 | switch (token) { | |
cc0538b6 AE |
775 | case Opt_read_only: |
776 | rbd_opts->read_only = true; | |
777 | break; | |
778 | case Opt_read_write: | |
779 | rbd_opts->read_only = false; | |
780 | break; | |
59c2be1e | 781 | default: |
aafb230e AE |
782 | rbd_assert(false); |
783 | break; | |
59c2be1e YS |
784 | } |
785 | return 0; | |
786 | } | |
787 | ||
602adf40 YS |
788 | /* |
789 | * Get a ceph client with specific addr and configuration, if one does | |
7262cfca AE |
790 | * not exist create it. Either way, ceph_opts is consumed by this |
791 | * function. | |
602adf40 | 792 | */ |
9d3997fd | 793 | static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
602adf40 | 794 | { |
f8c38929 | 795 | struct rbd_client *rbdc; |
59c2be1e | 796 | |
cfbf6377 | 797 | mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
1f7ba331 | 798 | rbdc = rbd_client_find(ceph_opts); |
9d3997fd | 799 | if (rbdc) /* using an existing client */ |
43ae4701 | 800 | ceph_destroy_options(ceph_opts); |
9d3997fd | 801 | else |
f8c38929 | 802 | rbdc = rbd_client_create(ceph_opts); |
cfbf6377 | 803 | mutex_unlock(&client_mutex); |
602adf40 | 804 | |
9d3997fd | 805 | return rbdc; |
602adf40 YS |
806 | } |
807 | ||
808 | /* | |
809 | * Destroy ceph client | |
d23a4b3f | 810 | * |
432b8587 | 811 | * Caller must hold rbd_client_list_lock. |
602adf40 YS |
812 | */ |
813 | static void rbd_client_release(struct kref *kref) | |
814 | { | |
815 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
816 | ||
37206ee5 | 817 | dout("%s: rbdc %p\n", __func__, rbdc); |
cd9d9f5d | 818 | spin_lock(&rbd_client_list_lock); |
602adf40 | 819 | list_del(&rbdc->node); |
cd9d9f5d | 820 | spin_unlock(&rbd_client_list_lock); |
602adf40 YS |
821 | |
822 | ceph_destroy_client(rbdc->client); | |
823 | kfree(rbdc); | |
824 | } | |
825 | ||
826 | /* | |
827 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
828 | * it. | |
829 | */ | |
9d3997fd | 830 | static void rbd_put_client(struct rbd_client *rbdc) |
602adf40 | 831 | { |
c53d5893 AE |
832 | if (rbdc) |
833 | kref_put(&rbdc->kref, rbd_client_release); | |
602adf40 YS |
834 | } |
835 | ||
a30b71b9 AE |
836 | static bool rbd_image_format_valid(u32 image_format) |
837 | { | |
838 | return image_format == 1 || image_format == 2; | |
839 | } | |
840 | ||
8e94af8e AE |
841 | static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
842 | { | |
103a150f AE |
843 | size_t size; |
844 | u32 snap_count; | |
845 | ||
846 | /* The header has to start with the magic rbd header text */ | |
847 | if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) | |
848 | return false; | |
849 | ||
db2388b6 AE |
850 | /* The bio layer requires at least sector-sized I/O */ |
851 | ||
852 | if (ondisk->options.order < SECTOR_SHIFT) | |
853 | return false; | |
854 | ||
855 | /* If we use u64 in a few spots we may be able to loosen this */ | |
856 | ||
857 | if (ondisk->options.order > 8 * sizeof (int) - 1) | |
858 | return false; | |
859 | ||
103a150f AE |
860 | /* |
861 | * The size of a snapshot header has to fit in a size_t, and | |
862 | * that limits the number of snapshots. | |
863 | */ | |
864 | snap_count = le32_to_cpu(ondisk->snap_count); | |
865 | size = SIZE_MAX - sizeof (struct ceph_snap_context); | |
866 | if (snap_count > size / sizeof (__le64)) | |
867 | return false; | |
868 | ||
869 | /* | |
870 | * Not only that, but the size of the entire the snapshot | |
871 | * header must also be representable in a size_t. | |
872 | */ | |
873 | size -= snap_count * sizeof (__le64); | |
874 | if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) | |
875 | return false; | |
876 | ||
877 | return true; | |
8e94af8e AE |
878 | } |
879 | ||
602adf40 | 880 | /* |
bb23e37a AE |
881 | * Fill an rbd image header with information from the given format 1 |
882 | * on-disk header. | |
602adf40 | 883 | */ |
662518b1 | 884 | static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
4156d998 | 885 | struct rbd_image_header_ondisk *ondisk) |
602adf40 | 886 | { |
662518b1 | 887 | struct rbd_image_header *header = &rbd_dev->header; |
bb23e37a AE |
888 | bool first_time = header->object_prefix == NULL; |
889 | struct ceph_snap_context *snapc; | |
890 | char *object_prefix = NULL; | |
891 | char *snap_names = NULL; | |
892 | u64 *snap_sizes = NULL; | |
ccece235 | 893 | u32 snap_count; |
d2bb24e5 | 894 | size_t size; |
bb23e37a | 895 | int ret = -ENOMEM; |
621901d6 | 896 | u32 i; |
602adf40 | 897 | |
bb23e37a | 898 | /* Allocate this now to avoid having to handle failure below */ |
6a52325f | 899 | |
bb23e37a AE |
900 | if (first_time) { |
901 | size_t len; | |
103a150f | 902 | |
bb23e37a AE |
903 | len = strnlen(ondisk->object_prefix, |
904 | sizeof (ondisk->object_prefix)); | |
905 | object_prefix = kmalloc(len + 1, GFP_KERNEL); | |
906 | if (!object_prefix) | |
907 | return -ENOMEM; | |
908 | memcpy(object_prefix, ondisk->object_prefix, len); | |
909 | object_prefix[len] = '\0'; | |
910 | } | |
00f1f36f | 911 | |
bb23e37a | 912 | /* Allocate the snapshot context and fill it in */ |
00f1f36f | 913 | |
bb23e37a AE |
914 | snap_count = le32_to_cpu(ondisk->snap_count); |
915 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); | |
916 | if (!snapc) | |
917 | goto out_err; | |
918 | snapc->seq = le64_to_cpu(ondisk->snap_seq); | |
602adf40 | 919 | if (snap_count) { |
bb23e37a | 920 | struct rbd_image_snap_ondisk *snaps; |
f785cc1d AE |
921 | u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
922 | ||
bb23e37a | 923 | /* We'll keep a copy of the snapshot names... */ |
621901d6 | 924 | |
bb23e37a AE |
925 | if (snap_names_len > (u64)SIZE_MAX) |
926 | goto out_2big; | |
927 | snap_names = kmalloc(snap_names_len, GFP_KERNEL); | |
928 | if (!snap_names) | |
6a52325f AE |
929 | goto out_err; |
930 | ||
bb23e37a | 931 | /* ...as well as the array of their sizes. */ |
621901d6 | 932 | |
d2bb24e5 | 933 | size = snap_count * sizeof (*header->snap_sizes); |
bb23e37a AE |
934 | snap_sizes = kmalloc(size, GFP_KERNEL); |
935 | if (!snap_sizes) | |
6a52325f | 936 | goto out_err; |
bb23e37a | 937 | |
f785cc1d | 938 | /* |
bb23e37a AE |
939 | * Copy the names, and fill in each snapshot's id |
940 | * and size. | |
941 | * | |
99a41ebc | 942 | * Note that rbd_dev_v1_header_info() guarantees the |
bb23e37a | 943 | * ondisk buffer we're working with has |
f785cc1d AE |
944 | * snap_names_len bytes beyond the end of the |
945 | * snapshot id array, this memcpy() is safe. | |
946 | */ | |
bb23e37a AE |
947 | memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
948 | snaps = ondisk->snaps; | |
949 | for (i = 0; i < snap_count; i++) { | |
950 | snapc->snaps[i] = le64_to_cpu(snaps[i].id); | |
951 | snap_sizes[i] = le64_to_cpu(snaps[i].image_size); | |
952 | } | |
602adf40 | 953 | } |
6a52325f | 954 | |
bb23e37a | 955 | /* We won't fail any more, fill in the header */ |
621901d6 | 956 | |
bb23e37a AE |
957 | if (first_time) { |
958 | header->object_prefix = object_prefix; | |
959 | header->obj_order = ondisk->options.order; | |
960 | header->crypt_type = ondisk->options.crypt_type; | |
961 | header->comp_type = ondisk->options.comp_type; | |
962 | /* The rest aren't used for format 1 images */ | |
963 | header->stripe_unit = 0; | |
964 | header->stripe_count = 0; | |
965 | header->features = 0; | |
602adf40 | 966 | } else { |
662518b1 AE |
967 | ceph_put_snap_context(header->snapc); |
968 | kfree(header->snap_names); | |
969 | kfree(header->snap_sizes); | |
602adf40 | 970 | } |
849b4260 | 971 | |
bb23e37a | 972 | /* The remaining fields always get updated (when we refresh) */ |
621901d6 | 973 | |
f84344f3 | 974 | header->image_size = le64_to_cpu(ondisk->image_size); |
bb23e37a AE |
975 | header->snapc = snapc; |
976 | header->snap_names = snap_names; | |
977 | header->snap_sizes = snap_sizes; | |
468521c1 | 978 | |
602adf40 | 979 | return 0; |
bb23e37a AE |
980 | out_2big: |
981 | ret = -EIO; | |
6a52325f | 982 | out_err: |
bb23e37a AE |
983 | kfree(snap_sizes); |
984 | kfree(snap_names); | |
985 | ceph_put_snap_context(snapc); | |
986 | kfree(object_prefix); | |
ccece235 | 987 | |
bb23e37a | 988 | return ret; |
602adf40 YS |
989 | } |
990 | ||
9682fc6d AE |
991 | static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
992 | { | |
993 | const char *snap_name; | |
994 | ||
995 | rbd_assert(which < rbd_dev->header.snapc->num_snaps); | |
996 | ||
997 | /* Skip over names until we find the one we are looking for */ | |
998 | ||
999 | snap_name = rbd_dev->header.snap_names; | |
1000 | while (which--) | |
1001 | snap_name += strlen(snap_name) + 1; | |
1002 | ||
1003 | return kstrdup(snap_name, GFP_KERNEL); | |
1004 | } | |
1005 | ||
30d1cff8 AE |
1006 | /* |
1007 | * Snapshot id comparison function for use with qsort()/bsearch(). | |
1008 | * Note that result is for snapshots in *descending* order. | |
1009 | */ | |
1010 | static int snapid_compare_reverse(const void *s1, const void *s2) | |
1011 | { | |
1012 | u64 snap_id1 = *(u64 *)s1; | |
1013 | u64 snap_id2 = *(u64 *)s2; | |
1014 | ||
1015 | if (snap_id1 < snap_id2) | |
1016 | return 1; | |
1017 | return snap_id1 == snap_id2 ? 0 : -1; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Search a snapshot context to see if the given snapshot id is | |
1022 | * present. | |
1023 | * | |
1024 | * Returns the position of the snapshot id in the array if it's found, | |
1025 | * or BAD_SNAP_INDEX otherwise. | |
1026 | * | |
1027 | * Note: The snapshot array is in kept sorted (by the osd) in | |
1028 | * reverse order, highest snapshot id first. | |
1029 | */ | |
9682fc6d AE |
1030 | static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
1031 | { | |
1032 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
30d1cff8 | 1033 | u64 *found; |
9682fc6d | 1034 | |
30d1cff8 AE |
1035 | found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
1036 | sizeof (snap_id), snapid_compare_reverse); | |
9682fc6d | 1037 | |
30d1cff8 | 1038 | return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
9682fc6d AE |
1039 | } |
1040 | ||
2ad3d716 AE |
1041 | static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
1042 | u64 snap_id) | |
9e15b77d | 1043 | { |
54cac61f | 1044 | u32 which; |
da6a6b63 | 1045 | const char *snap_name; |
9e15b77d | 1046 | |
54cac61f AE |
1047 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1048 | if (which == BAD_SNAP_INDEX) | |
da6a6b63 | 1049 | return ERR_PTR(-ENOENT); |
54cac61f | 1050 | |
da6a6b63 JD |
1051 | snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
1052 | return snap_name ? snap_name : ERR_PTR(-ENOMEM); | |
54cac61f AE |
1053 | } |
1054 | ||
1055 | static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) | |
1056 | { | |
9e15b77d AE |
1057 | if (snap_id == CEPH_NOSNAP) |
1058 | return RBD_SNAP_HEAD_NAME; | |
1059 | ||
54cac61f AE |
1060 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1061 | if (rbd_dev->image_format == 1) | |
1062 | return rbd_dev_v1_snap_name(rbd_dev, snap_id); | |
9e15b77d | 1063 | |
54cac61f | 1064 | return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
9e15b77d AE |
1065 | } |
1066 | ||
2ad3d716 AE |
1067 | static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
1068 | u64 *snap_size) | |
602adf40 | 1069 | { |
2ad3d716 AE |
1070 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1071 | if (snap_id == CEPH_NOSNAP) { | |
1072 | *snap_size = rbd_dev->header.image_size; | |
1073 | } else if (rbd_dev->image_format == 1) { | |
1074 | u32 which; | |
602adf40 | 1075 | |
2ad3d716 AE |
1076 | which = rbd_dev_snap_index(rbd_dev, snap_id); |
1077 | if (which == BAD_SNAP_INDEX) | |
1078 | return -ENOENT; | |
e86924a8 | 1079 | |
2ad3d716 AE |
1080 | *snap_size = rbd_dev->header.snap_sizes[which]; |
1081 | } else { | |
1082 | u64 size = 0; | |
1083 | int ret; | |
1084 | ||
1085 | ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); | |
1086 | if (ret) | |
1087 | return ret; | |
1088 | ||
1089 | *snap_size = size; | |
1090 | } | |
1091 | return 0; | |
602adf40 YS |
1092 | } |
1093 | ||
2ad3d716 AE |
1094 | static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
1095 | u64 *snap_features) | |
602adf40 | 1096 | { |
2ad3d716 AE |
1097 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
1098 | if (snap_id == CEPH_NOSNAP) { | |
1099 | *snap_features = rbd_dev->header.features; | |
1100 | } else if (rbd_dev->image_format == 1) { | |
1101 | *snap_features = 0; /* No features for format 1 */ | |
602adf40 | 1102 | } else { |
2ad3d716 AE |
1103 | u64 features = 0; |
1104 | int ret; | |
8b0241f8 | 1105 | |
2ad3d716 AE |
1106 | ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
1107 | if (ret) | |
1108 | return ret; | |
1109 | ||
1110 | *snap_features = features; | |
1111 | } | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) | |
1116 | { | |
8f4b7d98 | 1117 | u64 snap_id = rbd_dev->spec->snap_id; |
2ad3d716 AE |
1118 | u64 size = 0; |
1119 | u64 features = 0; | |
1120 | int ret; | |
1121 | ||
2ad3d716 AE |
1122 | ret = rbd_snap_size(rbd_dev, snap_id, &size); |
1123 | if (ret) | |
1124 | return ret; | |
1125 | ret = rbd_snap_features(rbd_dev, snap_id, &features); | |
1126 | if (ret) | |
1127 | return ret; | |
1128 | ||
1129 | rbd_dev->mapping.size = size; | |
1130 | rbd_dev->mapping.features = features; | |
1131 | ||
8b0241f8 | 1132 | return 0; |
602adf40 YS |
1133 | } |
1134 | ||
d1cf5788 AE |
1135 | static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
1136 | { | |
1137 | rbd_dev->mapping.size = 0; | |
1138 | rbd_dev->mapping.features = 0; | |
200a6a8b AE |
1139 | } |
1140 | ||
7d5079aa HS |
1141 | static void rbd_segment_name_free(const char *name) |
1142 | { | |
1143 | /* The explicit cast here is needed to drop the const qualifier */ | |
1144 | ||
1145 | kmem_cache_free(rbd_segment_name_cache, (void *)name); | |
1146 | } | |
1147 | ||
98571b5a | 1148 | static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
602adf40 | 1149 | { |
65ccfe21 AE |
1150 | char *name; |
1151 | u64 segment; | |
1152 | int ret; | |
3a96d5cd | 1153 | char *name_format; |
602adf40 | 1154 | |
78c2a44a | 1155 | name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO); |
65ccfe21 AE |
1156 | if (!name) |
1157 | return NULL; | |
1158 | segment = offset >> rbd_dev->header.obj_order; | |
3a96d5cd JD |
1159 | name_format = "%s.%012llx"; |
1160 | if (rbd_dev->image_format == 2) | |
1161 | name_format = "%s.%016llx"; | |
2d0ebc5d | 1162 | ret = snprintf(name, CEPH_MAX_OID_NAME_LEN + 1, name_format, |
65ccfe21 | 1163 | rbd_dev->header.object_prefix, segment); |
2d0ebc5d | 1164 | if (ret < 0 || ret > CEPH_MAX_OID_NAME_LEN) { |
65ccfe21 AE |
1165 | pr_err("error formatting segment name for #%llu (%d)\n", |
1166 | segment, ret); | |
7d5079aa | 1167 | rbd_segment_name_free(name); |
65ccfe21 AE |
1168 | name = NULL; |
1169 | } | |
602adf40 | 1170 | |
65ccfe21 AE |
1171 | return name; |
1172 | } | |
602adf40 | 1173 | |
65ccfe21 AE |
1174 | static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
1175 | { | |
1176 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
602adf40 | 1177 | |
65ccfe21 AE |
1178 | return offset & (segment_size - 1); |
1179 | } | |
1180 | ||
1181 | static u64 rbd_segment_length(struct rbd_device *rbd_dev, | |
1182 | u64 offset, u64 length) | |
1183 | { | |
1184 | u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; | |
1185 | ||
1186 | offset &= segment_size - 1; | |
1187 | ||
aafb230e | 1188 | rbd_assert(length <= U64_MAX - offset); |
65ccfe21 AE |
1189 | if (offset + length > segment_size) |
1190 | length = segment_size - offset; | |
1191 | ||
1192 | return length; | |
602adf40 YS |
1193 | } |
1194 | ||
029bcbd8 JD |
1195 | /* |
1196 | * returns the size of an object in the image | |
1197 | */ | |
1198 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
1199 | { | |
1200 | return 1 << header->obj_order; | |
1201 | } | |
1202 | ||
602adf40 YS |
1203 | /* |
1204 | * bio helpers | |
1205 | */ | |
1206 | ||
1207 | static void bio_chain_put(struct bio *chain) | |
1208 | { | |
1209 | struct bio *tmp; | |
1210 | ||
1211 | while (chain) { | |
1212 | tmp = chain; | |
1213 | chain = chain->bi_next; | |
1214 | bio_put(tmp); | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | /* | |
1219 | * zeros a bio chain, starting at specific offset | |
1220 | */ | |
1221 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
1222 | { | |
7988613b KO |
1223 | struct bio_vec bv; |
1224 | struct bvec_iter iter; | |
602adf40 YS |
1225 | unsigned long flags; |
1226 | void *buf; | |
602adf40 YS |
1227 | int pos = 0; |
1228 | ||
1229 | while (chain) { | |
7988613b KO |
1230 | bio_for_each_segment(bv, chain, iter) { |
1231 | if (pos + bv.bv_len > start_ofs) { | |
602adf40 | 1232 | int remainder = max(start_ofs - pos, 0); |
7988613b | 1233 | buf = bvec_kmap_irq(&bv, &flags); |
602adf40 | 1234 | memset(buf + remainder, 0, |
7988613b KO |
1235 | bv.bv_len - remainder); |
1236 | flush_dcache_page(bv.bv_page); | |
85b5aaa6 | 1237 | bvec_kunmap_irq(buf, &flags); |
602adf40 | 1238 | } |
7988613b | 1239 | pos += bv.bv_len; |
602adf40 YS |
1240 | } |
1241 | ||
1242 | chain = chain->bi_next; | |
1243 | } | |
1244 | } | |
1245 | ||
b9434c5b AE |
1246 | /* |
1247 | * similar to zero_bio_chain(), zeros data defined by a page array, | |
1248 | * starting at the given byte offset from the start of the array and | |
1249 | * continuing up to the given end offset. The pages array is | |
1250 | * assumed to be big enough to hold all bytes up to the end. | |
1251 | */ | |
1252 | static void zero_pages(struct page **pages, u64 offset, u64 end) | |
1253 | { | |
1254 | struct page **page = &pages[offset >> PAGE_SHIFT]; | |
1255 | ||
1256 | rbd_assert(end > offset); | |
1257 | rbd_assert(end - offset <= (u64)SIZE_MAX); | |
1258 | while (offset < end) { | |
1259 | size_t page_offset; | |
1260 | size_t length; | |
1261 | unsigned long flags; | |
1262 | void *kaddr; | |
1263 | ||
491205a8 GU |
1264 | page_offset = offset & ~PAGE_MASK; |
1265 | length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); | |
b9434c5b AE |
1266 | local_irq_save(flags); |
1267 | kaddr = kmap_atomic(*page); | |
1268 | memset(kaddr + page_offset, 0, length); | |
e2156054 | 1269 | flush_dcache_page(*page); |
b9434c5b AE |
1270 | kunmap_atomic(kaddr); |
1271 | local_irq_restore(flags); | |
1272 | ||
1273 | offset += length; | |
1274 | page++; | |
1275 | } | |
1276 | } | |
1277 | ||
602adf40 | 1278 | /* |
f7760dad AE |
1279 | * Clone a portion of a bio, starting at the given byte offset |
1280 | * and continuing for the number of bytes indicated. | |
602adf40 | 1281 | */ |
f7760dad AE |
1282 | static struct bio *bio_clone_range(struct bio *bio_src, |
1283 | unsigned int offset, | |
1284 | unsigned int len, | |
1285 | gfp_t gfpmask) | |
602adf40 | 1286 | { |
f7760dad AE |
1287 | struct bio *bio; |
1288 | ||
5341a627 | 1289 | bio = bio_clone(bio_src, gfpmask); |
f7760dad AE |
1290 | if (!bio) |
1291 | return NULL; /* ENOMEM */ | |
602adf40 | 1292 | |
5341a627 | 1293 | bio_advance(bio, offset); |
4f024f37 | 1294 | bio->bi_iter.bi_size = len; |
f7760dad AE |
1295 | |
1296 | return bio; | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Clone a portion of a bio chain, starting at the given byte offset | |
1301 | * into the first bio in the source chain and continuing for the | |
1302 | * number of bytes indicated. The result is another bio chain of | |
1303 | * exactly the given length, or a null pointer on error. | |
1304 | * | |
1305 | * The bio_src and offset parameters are both in-out. On entry they | |
1306 | * refer to the first source bio and the offset into that bio where | |
1307 | * the start of data to be cloned is located. | |
1308 | * | |
1309 | * On return, bio_src is updated to refer to the bio in the source | |
1310 | * chain that contains first un-cloned byte, and *offset will | |
1311 | * contain the offset of that byte within that bio. | |
1312 | */ | |
1313 | static struct bio *bio_chain_clone_range(struct bio **bio_src, | |
1314 | unsigned int *offset, | |
1315 | unsigned int len, | |
1316 | gfp_t gfpmask) | |
1317 | { | |
1318 | struct bio *bi = *bio_src; | |
1319 | unsigned int off = *offset; | |
1320 | struct bio *chain = NULL; | |
1321 | struct bio **end; | |
1322 | ||
1323 | /* Build up a chain of clone bios up to the limit */ | |
1324 | ||
4f024f37 | 1325 | if (!bi || off >= bi->bi_iter.bi_size || !len) |
f7760dad | 1326 | return NULL; /* Nothing to clone */ |
602adf40 | 1327 | |
f7760dad AE |
1328 | end = &chain; |
1329 | while (len) { | |
1330 | unsigned int bi_size; | |
1331 | struct bio *bio; | |
1332 | ||
f5400b7a AE |
1333 | if (!bi) { |
1334 | rbd_warn(NULL, "bio_chain exhausted with %u left", len); | |
f7760dad | 1335 | goto out_err; /* EINVAL; ran out of bio's */ |
f5400b7a | 1336 | } |
4f024f37 | 1337 | bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
f7760dad AE |
1338 | bio = bio_clone_range(bi, off, bi_size, gfpmask); |
1339 | if (!bio) | |
1340 | goto out_err; /* ENOMEM */ | |
1341 | ||
1342 | *end = bio; | |
1343 | end = &bio->bi_next; | |
602adf40 | 1344 | |
f7760dad | 1345 | off += bi_size; |
4f024f37 | 1346 | if (off == bi->bi_iter.bi_size) { |
f7760dad AE |
1347 | bi = bi->bi_next; |
1348 | off = 0; | |
1349 | } | |
1350 | len -= bi_size; | |
1351 | } | |
1352 | *bio_src = bi; | |
1353 | *offset = off; | |
1354 | ||
1355 | return chain; | |
1356 | out_err: | |
1357 | bio_chain_put(chain); | |
602adf40 | 1358 | |
602adf40 YS |
1359 | return NULL; |
1360 | } | |
1361 | ||
926f9b3f AE |
1362 | /* |
1363 | * The default/initial value for all object request flags is 0. For | |
1364 | * each flag, once its value is set to 1 it is never reset to 0 | |
1365 | * again. | |
1366 | */ | |
57acbaa7 | 1367 | static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
926f9b3f | 1368 | { |
57acbaa7 | 1369 | if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
926f9b3f AE |
1370 | struct rbd_device *rbd_dev; |
1371 | ||
57acbaa7 | 1372 | rbd_dev = obj_request->img_request->rbd_dev; |
9584d508 | 1373 | rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
926f9b3f AE |
1374 | obj_request); |
1375 | } | |
1376 | } | |
1377 | ||
57acbaa7 | 1378 | static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
926f9b3f AE |
1379 | { |
1380 | smp_mb(); | |
57acbaa7 | 1381 | return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
926f9b3f AE |
1382 | } |
1383 | ||
57acbaa7 | 1384 | static void obj_request_done_set(struct rbd_obj_request *obj_request) |
6365d33a | 1385 | { |
57acbaa7 AE |
1386 | if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
1387 | struct rbd_device *rbd_dev = NULL; | |
6365d33a | 1388 | |
57acbaa7 AE |
1389 | if (obj_request_img_data_test(obj_request)) |
1390 | rbd_dev = obj_request->img_request->rbd_dev; | |
9584d508 | 1391 | rbd_warn(rbd_dev, "obj_request %p already marked done", |
6365d33a AE |
1392 | obj_request); |
1393 | } | |
1394 | } | |
1395 | ||
57acbaa7 | 1396 | static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
6365d33a AE |
1397 | { |
1398 | smp_mb(); | |
57acbaa7 | 1399 | return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
6365d33a AE |
1400 | } |
1401 | ||
5679c59f AE |
1402 | /* |
1403 | * This sets the KNOWN flag after (possibly) setting the EXISTS | |
1404 | * flag. The latter is set based on the "exists" value provided. | |
1405 | * | |
1406 | * Note that for our purposes once an object exists it never goes | |
1407 | * away again. It's possible that the response from two existence | |
1408 | * checks are separated by the creation of the target object, and | |
1409 | * the first ("doesn't exist") response arrives *after* the second | |
1410 | * ("does exist"). In that case we ignore the second one. | |
1411 | */ | |
1412 | static void obj_request_existence_set(struct rbd_obj_request *obj_request, | |
1413 | bool exists) | |
1414 | { | |
1415 | if (exists) | |
1416 | set_bit(OBJ_REQ_EXISTS, &obj_request->flags); | |
1417 | set_bit(OBJ_REQ_KNOWN, &obj_request->flags); | |
1418 | smp_mb(); | |
1419 | } | |
1420 | ||
1421 | static bool obj_request_known_test(struct rbd_obj_request *obj_request) | |
1422 | { | |
1423 | smp_mb(); | |
1424 | return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; | |
1425 | } | |
1426 | ||
1427 | static bool obj_request_exists_test(struct rbd_obj_request *obj_request) | |
1428 | { | |
1429 | smp_mb(); | |
1430 | return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; | |
1431 | } | |
1432 | ||
9638556a ID |
1433 | static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
1434 | { | |
1435 | struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; | |
1436 | ||
1437 | return obj_request->img_offset < | |
1438 | round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); | |
1439 | } | |
1440 | ||
bf0d5f50 AE |
1441 | static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
1442 | { | |
37206ee5 AE |
1443 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1444 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1445 | kref_get(&obj_request->kref); |
1446 | } | |
1447 | ||
1448 | static void rbd_obj_request_destroy(struct kref *kref); | |
1449 | static void rbd_obj_request_put(struct rbd_obj_request *obj_request) | |
1450 | { | |
1451 | rbd_assert(obj_request != NULL); | |
37206ee5 AE |
1452 | dout("%s: obj %p (was %d)\n", __func__, obj_request, |
1453 | atomic_read(&obj_request->kref.refcount)); | |
bf0d5f50 AE |
1454 | kref_put(&obj_request->kref, rbd_obj_request_destroy); |
1455 | } | |
1456 | ||
0f2d5be7 AE |
1457 | static void rbd_img_request_get(struct rbd_img_request *img_request) |
1458 | { | |
1459 | dout("%s: img %p (was %d)\n", __func__, img_request, | |
1460 | atomic_read(&img_request->kref.refcount)); | |
1461 | kref_get(&img_request->kref); | |
1462 | } | |
1463 | ||
e93f3152 AE |
1464 | static bool img_request_child_test(struct rbd_img_request *img_request); |
1465 | static void rbd_parent_request_destroy(struct kref *kref); | |
bf0d5f50 AE |
1466 | static void rbd_img_request_destroy(struct kref *kref); |
1467 | static void rbd_img_request_put(struct rbd_img_request *img_request) | |
1468 | { | |
1469 | rbd_assert(img_request != NULL); | |
37206ee5 AE |
1470 | dout("%s: img %p (was %d)\n", __func__, img_request, |
1471 | atomic_read(&img_request->kref.refcount)); | |
e93f3152 AE |
1472 | if (img_request_child_test(img_request)) |
1473 | kref_put(&img_request->kref, rbd_parent_request_destroy); | |
1474 | else | |
1475 | kref_put(&img_request->kref, rbd_img_request_destroy); | |
bf0d5f50 AE |
1476 | } |
1477 | ||
1478 | static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, | |
1479 | struct rbd_obj_request *obj_request) | |
1480 | { | |
25dcf954 AE |
1481 | rbd_assert(obj_request->img_request == NULL); |
1482 | ||
b155e86c | 1483 | /* Image request now owns object's original reference */ |
bf0d5f50 | 1484 | obj_request->img_request = img_request; |
25dcf954 | 1485 | obj_request->which = img_request->obj_request_count; |
6365d33a AE |
1486 | rbd_assert(!obj_request_img_data_test(obj_request)); |
1487 | obj_request_img_data_set(obj_request); | |
bf0d5f50 | 1488 | rbd_assert(obj_request->which != BAD_WHICH); |
25dcf954 AE |
1489 | img_request->obj_request_count++; |
1490 | list_add_tail(&obj_request->links, &img_request->obj_requests); | |
37206ee5 AE |
1491 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1492 | obj_request->which); | |
bf0d5f50 AE |
1493 | } |
1494 | ||
1495 | static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, | |
1496 | struct rbd_obj_request *obj_request) | |
1497 | { | |
1498 | rbd_assert(obj_request->which != BAD_WHICH); | |
25dcf954 | 1499 | |
37206ee5 AE |
1500 | dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
1501 | obj_request->which); | |
bf0d5f50 | 1502 | list_del(&obj_request->links); |
25dcf954 AE |
1503 | rbd_assert(img_request->obj_request_count > 0); |
1504 | img_request->obj_request_count--; | |
1505 | rbd_assert(obj_request->which == img_request->obj_request_count); | |
1506 | obj_request->which = BAD_WHICH; | |
6365d33a | 1507 | rbd_assert(obj_request_img_data_test(obj_request)); |
bf0d5f50 | 1508 | rbd_assert(obj_request->img_request == img_request); |
bf0d5f50 | 1509 | obj_request->img_request = NULL; |
25dcf954 | 1510 | obj_request->callback = NULL; |
bf0d5f50 AE |
1511 | rbd_obj_request_put(obj_request); |
1512 | } | |
1513 | ||
1514 | static bool obj_request_type_valid(enum obj_request_type type) | |
1515 | { | |
1516 | switch (type) { | |
9969ebc5 | 1517 | case OBJ_REQUEST_NODATA: |
bf0d5f50 | 1518 | case OBJ_REQUEST_BIO: |
788e2df3 | 1519 | case OBJ_REQUEST_PAGES: |
bf0d5f50 AE |
1520 | return true; |
1521 | default: | |
1522 | return false; | |
1523 | } | |
1524 | } | |
1525 | ||
bf0d5f50 AE |
1526 | static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
1527 | struct rbd_obj_request *obj_request) | |
1528 | { | |
71c20a06 | 1529 | dout("%s %p\n", __func__, obj_request); |
bf0d5f50 AE |
1530 | return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
1531 | } | |
1532 | ||
71c20a06 ID |
1533 | static void rbd_obj_request_end(struct rbd_obj_request *obj_request) |
1534 | { | |
1535 | dout("%s %p\n", __func__, obj_request); | |
1536 | ceph_osdc_cancel_request(obj_request->osd_req); | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * Wait for an object request to complete. If interrupted, cancel the | |
1541 | * underlying osd request. | |
1542 | */ | |
1543 | static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) | |
1544 | { | |
1545 | int ret; | |
1546 | ||
1547 | dout("%s %p\n", __func__, obj_request); | |
1548 | ||
1549 | ret = wait_for_completion_interruptible(&obj_request->completion); | |
1550 | if (ret < 0) { | |
1551 | dout("%s %p interrupted\n", __func__, obj_request); | |
1552 | rbd_obj_request_end(obj_request); | |
1553 | return ret; | |
1554 | } | |
1555 | ||
1556 | dout("%s %p done\n", __func__, obj_request); | |
1557 | return 0; | |
1558 | } | |
1559 | ||
bf0d5f50 AE |
1560 | static void rbd_img_request_complete(struct rbd_img_request *img_request) |
1561 | { | |
55f27e09 | 1562 | |
37206ee5 | 1563 | dout("%s: img %p\n", __func__, img_request); |
55f27e09 AE |
1564 | |
1565 | /* | |
1566 | * If no error occurred, compute the aggregate transfer | |
1567 | * count for the image request. We could instead use | |
1568 | * atomic64_cmpxchg() to update it as each object request | |
1569 | * completes; not clear which way is better off hand. | |
1570 | */ | |
1571 | if (!img_request->result) { | |
1572 | struct rbd_obj_request *obj_request; | |
1573 | u64 xferred = 0; | |
1574 | ||
1575 | for_each_obj_request(img_request, obj_request) | |
1576 | xferred += obj_request->xferred; | |
1577 | img_request->xferred = xferred; | |
1578 | } | |
1579 | ||
bf0d5f50 AE |
1580 | if (img_request->callback) |
1581 | img_request->callback(img_request); | |
1582 | else | |
1583 | rbd_img_request_put(img_request); | |
1584 | } | |
1585 | ||
0c425248 AE |
1586 | /* |
1587 | * The default/initial value for all image request flags is 0. Each | |
1588 | * is conditionally set to 1 at image request initialization time | |
1589 | * and currently never change thereafter. | |
1590 | */ | |
1591 | static void img_request_write_set(struct rbd_img_request *img_request) | |
1592 | { | |
1593 | set_bit(IMG_REQ_WRITE, &img_request->flags); | |
1594 | smp_mb(); | |
1595 | } | |
1596 | ||
1597 | static bool img_request_write_test(struct rbd_img_request *img_request) | |
1598 | { | |
1599 | smp_mb(); | |
1600 | return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; | |
1601 | } | |
1602 | ||
9849e986 AE |
1603 | static void img_request_child_set(struct rbd_img_request *img_request) |
1604 | { | |
1605 | set_bit(IMG_REQ_CHILD, &img_request->flags); | |
1606 | smp_mb(); | |
1607 | } | |
1608 | ||
e93f3152 AE |
1609 | static void img_request_child_clear(struct rbd_img_request *img_request) |
1610 | { | |
1611 | clear_bit(IMG_REQ_CHILD, &img_request->flags); | |
1612 | smp_mb(); | |
1613 | } | |
1614 | ||
9849e986 AE |
1615 | static bool img_request_child_test(struct rbd_img_request *img_request) |
1616 | { | |
1617 | smp_mb(); | |
1618 | return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; | |
1619 | } | |
1620 | ||
d0b2e944 AE |
1621 | static void img_request_layered_set(struct rbd_img_request *img_request) |
1622 | { | |
1623 | set_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1624 | smp_mb(); | |
1625 | } | |
1626 | ||
a2acd00e AE |
1627 | static void img_request_layered_clear(struct rbd_img_request *img_request) |
1628 | { | |
1629 | clear_bit(IMG_REQ_LAYERED, &img_request->flags); | |
1630 | smp_mb(); | |
1631 | } | |
1632 | ||
d0b2e944 AE |
1633 | static bool img_request_layered_test(struct rbd_img_request *img_request) |
1634 | { | |
1635 | smp_mb(); | |
1636 | return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; | |
1637 | } | |
1638 | ||
6e2a4505 AE |
1639 | static void |
1640 | rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) | |
1641 | { | |
b9434c5b AE |
1642 | u64 xferred = obj_request->xferred; |
1643 | u64 length = obj_request->length; | |
1644 | ||
6e2a4505 AE |
1645 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
1646 | obj_request, obj_request->img_request, obj_request->result, | |
b9434c5b | 1647 | xferred, length); |
6e2a4505 | 1648 | /* |
17c1cc1d JD |
1649 | * ENOENT means a hole in the image. We zero-fill the entire |
1650 | * length of the request. A short read also implies zero-fill | |
1651 | * to the end of the request. An error requires the whole | |
1652 | * length of the request to be reported finished with an error | |
1653 | * to the block layer. In each case we update the xferred | |
1654 | * count to indicate the whole request was satisfied. | |
6e2a4505 | 1655 | */ |
b9434c5b | 1656 | rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
6e2a4505 | 1657 | if (obj_request->result == -ENOENT) { |
b9434c5b AE |
1658 | if (obj_request->type == OBJ_REQUEST_BIO) |
1659 | zero_bio_chain(obj_request->bio_list, 0); | |
1660 | else | |
1661 | zero_pages(obj_request->pages, 0, length); | |
6e2a4505 | 1662 | obj_request->result = 0; |
b9434c5b AE |
1663 | } else if (xferred < length && !obj_request->result) { |
1664 | if (obj_request->type == OBJ_REQUEST_BIO) | |
1665 | zero_bio_chain(obj_request->bio_list, xferred); | |
1666 | else | |
1667 | zero_pages(obj_request->pages, xferred, length); | |
6e2a4505 | 1668 | } |
17c1cc1d | 1669 | obj_request->xferred = length; |
6e2a4505 AE |
1670 | obj_request_done_set(obj_request); |
1671 | } | |
1672 | ||
bf0d5f50 AE |
1673 | static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
1674 | { | |
37206ee5 AE |
1675 | dout("%s: obj %p cb %p\n", __func__, obj_request, |
1676 | obj_request->callback); | |
bf0d5f50 AE |
1677 | if (obj_request->callback) |
1678 | obj_request->callback(obj_request); | |
788e2df3 AE |
1679 | else |
1680 | complete_all(&obj_request->completion); | |
bf0d5f50 AE |
1681 | } |
1682 | ||
c47f9371 | 1683 | static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request) |
39bf2c5d AE |
1684 | { |
1685 | dout("%s: obj %p\n", __func__, obj_request); | |
1686 | obj_request_done_set(obj_request); | |
1687 | } | |
1688 | ||
c47f9371 | 1689 | static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1690 | { |
57acbaa7 | 1691 | struct rbd_img_request *img_request = NULL; |
a9e8ba2c | 1692 | struct rbd_device *rbd_dev = NULL; |
57acbaa7 AE |
1693 | bool layered = false; |
1694 | ||
1695 | if (obj_request_img_data_test(obj_request)) { | |
1696 | img_request = obj_request->img_request; | |
1697 | layered = img_request && img_request_layered_test(img_request); | |
a9e8ba2c | 1698 | rbd_dev = img_request->rbd_dev; |
57acbaa7 | 1699 | } |
8b3e1a56 AE |
1700 | |
1701 | dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, | |
1702 | obj_request, img_request, obj_request->result, | |
1703 | obj_request->xferred, obj_request->length); | |
a9e8ba2c AE |
1704 | if (layered && obj_request->result == -ENOENT && |
1705 | obj_request->img_offset < rbd_dev->parent_overlap) | |
8b3e1a56 AE |
1706 | rbd_img_parent_read(obj_request); |
1707 | else if (img_request) | |
6e2a4505 AE |
1708 | rbd_img_obj_request_read_callback(obj_request); |
1709 | else | |
1710 | obj_request_done_set(obj_request); | |
bf0d5f50 AE |
1711 | } |
1712 | ||
c47f9371 | 1713 | static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
bf0d5f50 | 1714 | { |
1b83bef2 SW |
1715 | dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
1716 | obj_request->result, obj_request->length); | |
1717 | /* | |
8b3e1a56 AE |
1718 | * There is no such thing as a successful short write. Set |
1719 | * it to our originally-requested length. | |
1b83bef2 SW |
1720 | */ |
1721 | obj_request->xferred = obj_request->length; | |
07741308 | 1722 | obj_request_done_set(obj_request); |
bf0d5f50 AE |
1723 | } |
1724 | ||
fbfab539 AE |
1725 | /* |
1726 | * For a simple stat call there's nothing to do. We'll do more if | |
1727 | * this is part of a write sequence for a layered image. | |
1728 | */ | |
c47f9371 | 1729 | static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
fbfab539 | 1730 | { |
37206ee5 | 1731 | dout("%s: obj %p\n", __func__, obj_request); |
fbfab539 AE |
1732 | obj_request_done_set(obj_request); |
1733 | } | |
1734 | ||
bf0d5f50 AE |
1735 | static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
1736 | struct ceph_msg *msg) | |
1737 | { | |
1738 | struct rbd_obj_request *obj_request = osd_req->r_priv; | |
bf0d5f50 AE |
1739 | u16 opcode; |
1740 | ||
37206ee5 | 1741 | dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg); |
bf0d5f50 | 1742 | rbd_assert(osd_req == obj_request->osd_req); |
57acbaa7 AE |
1743 | if (obj_request_img_data_test(obj_request)) { |
1744 | rbd_assert(obj_request->img_request); | |
1745 | rbd_assert(obj_request->which != BAD_WHICH); | |
1746 | } else { | |
1747 | rbd_assert(obj_request->which == BAD_WHICH); | |
1748 | } | |
bf0d5f50 | 1749 | |
1b83bef2 SW |
1750 | if (osd_req->r_result < 0) |
1751 | obj_request->result = osd_req->r_result; | |
bf0d5f50 | 1752 | |
7cc69d42 | 1753 | rbd_assert(osd_req->r_num_ops <= CEPH_OSD_MAX_OP); |
bf0d5f50 | 1754 | |
c47f9371 AE |
1755 | /* |
1756 | * We support a 64-bit length, but ultimately it has to be | |
1757 | * passed to blk_end_request(), which takes an unsigned int. | |
1758 | */ | |
1b83bef2 | 1759 | obj_request->xferred = osd_req->r_reply_op_len[0]; |
8b3e1a56 | 1760 | rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
0ccd5926 | 1761 | |
79528734 | 1762 | opcode = osd_req->r_ops[0].op; |
bf0d5f50 AE |
1763 | switch (opcode) { |
1764 | case CEPH_OSD_OP_READ: | |
c47f9371 | 1765 | rbd_osd_read_callback(obj_request); |
bf0d5f50 | 1766 | break; |
0ccd5926 ID |
1767 | case CEPH_OSD_OP_SETALLOCHINT: |
1768 | rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE); | |
1769 | /* fall through */ | |
bf0d5f50 | 1770 | case CEPH_OSD_OP_WRITE: |
c47f9371 | 1771 | rbd_osd_write_callback(obj_request); |
bf0d5f50 | 1772 | break; |
fbfab539 | 1773 | case CEPH_OSD_OP_STAT: |
c47f9371 | 1774 | rbd_osd_stat_callback(obj_request); |
fbfab539 | 1775 | break; |
36be9a76 | 1776 | case CEPH_OSD_OP_CALL: |
b8d70035 | 1777 | case CEPH_OSD_OP_NOTIFY_ACK: |
9969ebc5 | 1778 | case CEPH_OSD_OP_WATCH: |
c47f9371 | 1779 | rbd_osd_trivial_callback(obj_request); |
9969ebc5 | 1780 | break; |
bf0d5f50 | 1781 | default: |
9584d508 | 1782 | rbd_warn(NULL, "%s: unsupported op %hu", |
bf0d5f50 AE |
1783 | obj_request->object_name, (unsigned short) opcode); |
1784 | break; | |
1785 | } | |
1786 | ||
07741308 | 1787 | if (obj_request_done_test(obj_request)) |
bf0d5f50 AE |
1788 | rbd_obj_request_complete(obj_request); |
1789 | } | |
1790 | ||
9d4df01f | 1791 | static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
430c28c3 AE |
1792 | { |
1793 | struct rbd_img_request *img_request = obj_request->img_request; | |
8c042b0d | 1794 | struct ceph_osd_request *osd_req = obj_request->osd_req; |
9d4df01f | 1795 | u64 snap_id; |
430c28c3 | 1796 | |
8c042b0d | 1797 | rbd_assert(osd_req != NULL); |
430c28c3 | 1798 | |
9d4df01f | 1799 | snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP; |
8c042b0d | 1800 | ceph_osdc_build_request(osd_req, obj_request->offset, |
9d4df01f AE |
1801 | NULL, snap_id, NULL); |
1802 | } | |
1803 | ||
1804 | static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) | |
1805 | { | |
1806 | struct rbd_img_request *img_request = obj_request->img_request; | |
1807 | struct ceph_osd_request *osd_req = obj_request->osd_req; | |
1808 | struct ceph_snap_context *snapc; | |
1809 | struct timespec mtime = CURRENT_TIME; | |
1810 | ||
1811 | rbd_assert(osd_req != NULL); | |
1812 | ||
1813 | snapc = img_request ? img_request->snapc : NULL; | |
1814 | ceph_osdc_build_request(osd_req, obj_request->offset, | |
1815 | snapc, CEPH_NOSNAP, &mtime); | |
430c28c3 AE |
1816 | } |
1817 | ||
0ccd5926 ID |
1818 | /* |
1819 | * Create an osd request. A read request has one osd op (read). | |
1820 | * A write request has either one (watch) or two (hint+write) osd ops. | |
1821 | * (All rbd data writes are prefixed with an allocation hint op, but | |
1822 | * technically osd watch is a write request, hence this distinction.) | |
1823 | */ | |
bf0d5f50 AE |
1824 | static struct ceph_osd_request *rbd_osd_req_create( |
1825 | struct rbd_device *rbd_dev, | |
1826 | bool write_request, | |
deb236b3 | 1827 | unsigned int num_ops, |
430c28c3 | 1828 | struct rbd_obj_request *obj_request) |
bf0d5f50 | 1829 | { |
bf0d5f50 AE |
1830 | struct ceph_snap_context *snapc = NULL; |
1831 | struct ceph_osd_client *osdc; | |
1832 | struct ceph_osd_request *osd_req; | |
bf0d5f50 | 1833 | |
6365d33a AE |
1834 | if (obj_request_img_data_test(obj_request)) { |
1835 | struct rbd_img_request *img_request = obj_request->img_request; | |
1836 | ||
0c425248 AE |
1837 | rbd_assert(write_request == |
1838 | img_request_write_test(img_request)); | |
1839 | if (write_request) | |
bf0d5f50 | 1840 | snapc = img_request->snapc; |
bf0d5f50 AE |
1841 | } |
1842 | ||
0ccd5926 | 1843 | rbd_assert(num_ops == 1 || (write_request && num_ops == 2)); |
deb236b3 ID |
1844 | |
1845 | /* Allocate and initialize the request, for the num_ops ops */ | |
bf0d5f50 AE |
1846 | |
1847 | osdc = &rbd_dev->rbd_client->client->osdc; | |
deb236b3 ID |
1848 | osd_req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, |
1849 | GFP_ATOMIC); | |
bf0d5f50 AE |
1850 | if (!osd_req) |
1851 | return NULL; /* ENOMEM */ | |
bf0d5f50 | 1852 | |
430c28c3 | 1853 | if (write_request) |
bf0d5f50 | 1854 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
430c28c3 | 1855 | else |
bf0d5f50 | 1856 | osd_req->r_flags = CEPH_OSD_FLAG_READ; |
bf0d5f50 AE |
1857 | |
1858 | osd_req->r_callback = rbd_osd_req_callback; | |
1859 | osd_req->r_priv = obj_request; | |
1860 | ||
3c972c95 ID |
1861 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1862 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
bf0d5f50 | 1863 | |
bf0d5f50 AE |
1864 | return osd_req; |
1865 | } | |
1866 | ||
0eefd470 AE |
1867 | /* |
1868 | * Create a copyup osd request based on the information in the | |
0ccd5926 ID |
1869 | * object request supplied. A copyup request has three osd ops, |
1870 | * a copyup method call, a hint op, and a write op. | |
0eefd470 AE |
1871 | */ |
1872 | static struct ceph_osd_request * | |
1873 | rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) | |
1874 | { | |
1875 | struct rbd_img_request *img_request; | |
1876 | struct ceph_snap_context *snapc; | |
1877 | struct rbd_device *rbd_dev; | |
1878 | struct ceph_osd_client *osdc; | |
1879 | struct ceph_osd_request *osd_req; | |
1880 | ||
1881 | rbd_assert(obj_request_img_data_test(obj_request)); | |
1882 | img_request = obj_request->img_request; | |
1883 | rbd_assert(img_request); | |
1884 | rbd_assert(img_request_write_test(img_request)); | |
1885 | ||
0ccd5926 | 1886 | /* Allocate and initialize the request, for the three ops */ |
0eefd470 AE |
1887 | |
1888 | snapc = img_request->snapc; | |
1889 | rbd_dev = img_request->rbd_dev; | |
1890 | osdc = &rbd_dev->rbd_client->client->osdc; | |
0ccd5926 | 1891 | osd_req = ceph_osdc_alloc_request(osdc, snapc, 3, false, GFP_ATOMIC); |
0eefd470 AE |
1892 | if (!osd_req) |
1893 | return NULL; /* ENOMEM */ | |
1894 | ||
1895 | osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; | |
1896 | osd_req->r_callback = rbd_osd_req_callback; | |
1897 | osd_req->r_priv = obj_request; | |
1898 | ||
3c972c95 ID |
1899 | osd_req->r_base_oloc.pool = ceph_file_layout_pg_pool(rbd_dev->layout); |
1900 | ceph_oid_set_name(&osd_req->r_base_oid, obj_request->object_name); | |
0eefd470 | 1901 | |
0eefd470 AE |
1902 | return osd_req; |
1903 | } | |
1904 | ||
1905 | ||
bf0d5f50 AE |
1906 | static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
1907 | { | |
1908 | ceph_osdc_put_request(osd_req); | |
1909 | } | |
1910 | ||
1911 | /* object_name is assumed to be a non-null pointer and NUL-terminated */ | |
1912 | ||
1913 | static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, | |
1914 | u64 offset, u64 length, | |
1915 | enum obj_request_type type) | |
1916 | { | |
1917 | struct rbd_obj_request *obj_request; | |
1918 | size_t size; | |
1919 | char *name; | |
1920 | ||
1921 | rbd_assert(obj_request_type_valid(type)); | |
1922 | ||
1923 | size = strlen(object_name) + 1; | |
f907ad55 AE |
1924 | name = kmalloc(size, GFP_KERNEL); |
1925 | if (!name) | |
bf0d5f50 AE |
1926 | return NULL; |
1927 | ||
868311b1 | 1928 | obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL); |
f907ad55 AE |
1929 | if (!obj_request) { |
1930 | kfree(name); | |
1931 | return NULL; | |
1932 | } | |
1933 | ||
bf0d5f50 AE |
1934 | obj_request->object_name = memcpy(name, object_name, size); |
1935 | obj_request->offset = offset; | |
1936 | obj_request->length = length; | |
926f9b3f | 1937 | obj_request->flags = 0; |
bf0d5f50 AE |
1938 | obj_request->which = BAD_WHICH; |
1939 | obj_request->type = type; | |
1940 | INIT_LIST_HEAD(&obj_request->links); | |
788e2df3 | 1941 | init_completion(&obj_request->completion); |
bf0d5f50 AE |
1942 | kref_init(&obj_request->kref); |
1943 | ||
37206ee5 AE |
1944 | dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name, |
1945 | offset, length, (int)type, obj_request); | |
1946 | ||
bf0d5f50 AE |
1947 | return obj_request; |
1948 | } | |
1949 | ||
1950 | static void rbd_obj_request_destroy(struct kref *kref) | |
1951 | { | |
1952 | struct rbd_obj_request *obj_request; | |
1953 | ||
1954 | obj_request = container_of(kref, struct rbd_obj_request, kref); | |
1955 | ||
37206ee5 AE |
1956 | dout("%s: obj %p\n", __func__, obj_request); |
1957 | ||
bf0d5f50 AE |
1958 | rbd_assert(obj_request->img_request == NULL); |
1959 | rbd_assert(obj_request->which == BAD_WHICH); | |
1960 | ||
1961 | if (obj_request->osd_req) | |
1962 | rbd_osd_req_destroy(obj_request->osd_req); | |
1963 | ||
1964 | rbd_assert(obj_request_type_valid(obj_request->type)); | |
1965 | switch (obj_request->type) { | |
9969ebc5 AE |
1966 | case OBJ_REQUEST_NODATA: |
1967 | break; /* Nothing to do */ | |
bf0d5f50 AE |
1968 | case OBJ_REQUEST_BIO: |
1969 | if (obj_request->bio_list) | |
1970 | bio_chain_put(obj_request->bio_list); | |
1971 | break; | |
788e2df3 AE |
1972 | case OBJ_REQUEST_PAGES: |
1973 | if (obj_request->pages) | |
1974 | ceph_release_page_vector(obj_request->pages, | |
1975 | obj_request->page_count); | |
1976 | break; | |
bf0d5f50 AE |
1977 | } |
1978 | ||
f907ad55 | 1979 | kfree(obj_request->object_name); |
868311b1 AE |
1980 | obj_request->object_name = NULL; |
1981 | kmem_cache_free(rbd_obj_request_cache, obj_request); | |
bf0d5f50 AE |
1982 | } |
1983 | ||
fb65d228 AE |
1984 | /* It's OK to call this for a device with no parent */ |
1985 | ||
1986 | static void rbd_spec_put(struct rbd_spec *spec); | |
1987 | static void rbd_dev_unparent(struct rbd_device *rbd_dev) | |
1988 | { | |
1989 | rbd_dev_remove_parent(rbd_dev); | |
1990 | rbd_spec_put(rbd_dev->parent_spec); | |
1991 | rbd_dev->parent_spec = NULL; | |
1992 | rbd_dev->parent_overlap = 0; | |
1993 | } | |
1994 | ||
a2acd00e AE |
1995 | /* |
1996 | * Parent image reference counting is used to determine when an | |
1997 | * image's parent fields can be safely torn down--after there are no | |
1998 | * more in-flight requests to the parent image. When the last | |
1999 | * reference is dropped, cleaning them up is safe. | |
2000 | */ | |
2001 | static void rbd_dev_parent_put(struct rbd_device *rbd_dev) | |
2002 | { | |
2003 | int counter; | |
2004 | ||
2005 | if (!rbd_dev->parent_spec) | |
2006 | return; | |
2007 | ||
2008 | counter = atomic_dec_return_safe(&rbd_dev->parent_ref); | |
2009 | if (counter > 0) | |
2010 | return; | |
2011 | ||
2012 | /* Last reference; clean up parent data structures */ | |
2013 | ||
2014 | if (!counter) | |
2015 | rbd_dev_unparent(rbd_dev); | |
2016 | else | |
9584d508 | 2017 | rbd_warn(rbd_dev, "parent reference underflow"); |
a2acd00e AE |
2018 | } |
2019 | ||
2020 | /* | |
2021 | * If an image has a non-zero parent overlap, get a reference to its | |
2022 | * parent. | |
2023 | * | |
392a9dad AE |
2024 | * We must get the reference before checking for the overlap to |
2025 | * coordinate properly with zeroing the parent overlap in | |
2026 | * rbd_dev_v2_parent_info() when an image gets flattened. We | |
2027 | * drop it again if there is no overlap. | |
2028 | * | |
a2acd00e AE |
2029 | * Returns true if the rbd device has a parent with a non-zero |
2030 | * overlap and a reference for it was successfully taken, or | |
2031 | * false otherwise. | |
2032 | */ | |
2033 | static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) | |
2034 | { | |
2035 | int counter; | |
2036 | ||
2037 | if (!rbd_dev->parent_spec) | |
2038 | return false; | |
2039 | ||
2040 | counter = atomic_inc_return_safe(&rbd_dev->parent_ref); | |
2041 | if (counter > 0 && rbd_dev->parent_overlap) | |
2042 | return true; | |
2043 | ||
2044 | /* Image was flattened, but parent is not yet torn down */ | |
2045 | ||
2046 | if (counter < 0) | |
9584d508 | 2047 | rbd_warn(rbd_dev, "parent reference overflow"); |
a2acd00e AE |
2048 | |
2049 | return false; | |
2050 | } | |
2051 | ||
bf0d5f50 AE |
2052 | /* |
2053 | * Caller is responsible for filling in the list of object requests | |
2054 | * that comprises the image request, and the Linux request pointer | |
2055 | * (if there is one). | |
2056 | */ | |
cc344fa1 AE |
2057 | static struct rbd_img_request *rbd_img_request_create( |
2058 | struct rbd_device *rbd_dev, | |
bf0d5f50 | 2059 | u64 offset, u64 length, |
4e752f0a JD |
2060 | bool write_request, |
2061 | struct ceph_snap_context *snapc) | |
bf0d5f50 AE |
2062 | { |
2063 | struct rbd_img_request *img_request; | |
bf0d5f50 | 2064 | |
7a716aac | 2065 | img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
bf0d5f50 AE |
2066 | if (!img_request) |
2067 | return NULL; | |
2068 | ||
bf0d5f50 AE |
2069 | img_request->rq = NULL; |
2070 | img_request->rbd_dev = rbd_dev; | |
2071 | img_request->offset = offset; | |
2072 | img_request->length = length; | |
0c425248 AE |
2073 | img_request->flags = 0; |
2074 | if (write_request) { | |
2075 | img_request_write_set(img_request); | |
4e752f0a | 2076 | img_request->snapc = snapc; |
0c425248 | 2077 | } else { |
bf0d5f50 | 2078 | img_request->snap_id = rbd_dev->spec->snap_id; |
0c425248 | 2079 | } |
a2acd00e | 2080 | if (rbd_dev_parent_get(rbd_dev)) |
d0b2e944 | 2081 | img_request_layered_set(img_request); |
bf0d5f50 AE |
2082 | spin_lock_init(&img_request->completion_lock); |
2083 | img_request->next_completion = 0; | |
2084 | img_request->callback = NULL; | |
a5a337d4 | 2085 | img_request->result = 0; |
bf0d5f50 AE |
2086 | img_request->obj_request_count = 0; |
2087 | INIT_LIST_HEAD(&img_request->obj_requests); | |
2088 | kref_init(&img_request->kref); | |
2089 | ||
37206ee5 AE |
2090 | dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
2091 | write_request ? "write" : "read", offset, length, | |
2092 | img_request); | |
2093 | ||
bf0d5f50 AE |
2094 | return img_request; |
2095 | } | |
2096 | ||
2097 | static void rbd_img_request_destroy(struct kref *kref) | |
2098 | { | |
2099 | struct rbd_img_request *img_request; | |
2100 | struct rbd_obj_request *obj_request; | |
2101 | struct rbd_obj_request *next_obj_request; | |
2102 | ||
2103 | img_request = container_of(kref, struct rbd_img_request, kref); | |
2104 | ||
37206ee5 AE |
2105 | dout("%s: img %p\n", __func__, img_request); |
2106 | ||
bf0d5f50 AE |
2107 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
2108 | rbd_img_obj_request_del(img_request, obj_request); | |
25dcf954 | 2109 | rbd_assert(img_request->obj_request_count == 0); |
bf0d5f50 | 2110 | |
a2acd00e AE |
2111 | if (img_request_layered_test(img_request)) { |
2112 | img_request_layered_clear(img_request); | |
2113 | rbd_dev_parent_put(img_request->rbd_dev); | |
2114 | } | |
2115 | ||
0c425248 | 2116 | if (img_request_write_test(img_request)) |
812164f8 | 2117 | ceph_put_snap_context(img_request->snapc); |
bf0d5f50 | 2118 | |
1c2a9dfe | 2119 | kmem_cache_free(rbd_img_request_cache, img_request); |
bf0d5f50 AE |
2120 | } |
2121 | ||
e93f3152 AE |
2122 | static struct rbd_img_request *rbd_parent_request_create( |
2123 | struct rbd_obj_request *obj_request, | |
2124 | u64 img_offset, u64 length) | |
2125 | { | |
2126 | struct rbd_img_request *parent_request; | |
2127 | struct rbd_device *rbd_dev; | |
2128 | ||
2129 | rbd_assert(obj_request->img_request); | |
2130 | rbd_dev = obj_request->img_request->rbd_dev; | |
2131 | ||
4e752f0a JD |
2132 | parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
2133 | length, false, NULL); | |
e93f3152 AE |
2134 | if (!parent_request) |
2135 | return NULL; | |
2136 | ||
2137 | img_request_child_set(parent_request); | |
2138 | rbd_obj_request_get(obj_request); | |
2139 | parent_request->obj_request = obj_request; | |
2140 | ||
2141 | return parent_request; | |
2142 | } | |
2143 | ||
2144 | static void rbd_parent_request_destroy(struct kref *kref) | |
2145 | { | |
2146 | struct rbd_img_request *parent_request; | |
2147 | struct rbd_obj_request *orig_request; | |
2148 | ||
2149 | parent_request = container_of(kref, struct rbd_img_request, kref); | |
2150 | orig_request = parent_request->obj_request; | |
2151 | ||
2152 | parent_request->obj_request = NULL; | |
2153 | rbd_obj_request_put(orig_request); | |
2154 | img_request_child_clear(parent_request); | |
2155 | ||
2156 | rbd_img_request_destroy(kref); | |
2157 | } | |
2158 | ||
1217857f AE |
2159 | static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
2160 | { | |
6365d33a | 2161 | struct rbd_img_request *img_request; |
1217857f AE |
2162 | unsigned int xferred; |
2163 | int result; | |
8b3e1a56 | 2164 | bool more; |
1217857f | 2165 | |
6365d33a AE |
2166 | rbd_assert(obj_request_img_data_test(obj_request)); |
2167 | img_request = obj_request->img_request; | |
2168 | ||
1217857f AE |
2169 | rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
2170 | xferred = (unsigned int)obj_request->xferred; | |
2171 | result = obj_request->result; | |
2172 | if (result) { | |
2173 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2174 | ||
9584d508 | 2175 | rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
1217857f AE |
2176 | img_request_write_test(img_request) ? "write" : "read", |
2177 | obj_request->length, obj_request->img_offset, | |
2178 | obj_request->offset); | |
9584d508 | 2179 | rbd_warn(rbd_dev, " result %d xferred %x", |
1217857f AE |
2180 | result, xferred); |
2181 | if (!img_request->result) | |
2182 | img_request->result = result; | |
2183 | } | |
2184 | ||
f1a4739f AE |
2185 | /* Image object requests don't own their page array */ |
2186 | ||
2187 | if (obj_request->type == OBJ_REQUEST_PAGES) { | |
2188 | obj_request->pages = NULL; | |
2189 | obj_request->page_count = 0; | |
2190 | } | |
2191 | ||
8b3e1a56 AE |
2192 | if (img_request_child_test(img_request)) { |
2193 | rbd_assert(img_request->obj_request != NULL); | |
2194 | more = obj_request->which < img_request->obj_request_count - 1; | |
2195 | } else { | |
2196 | rbd_assert(img_request->rq != NULL); | |
2197 | more = blk_end_request(img_request->rq, result, xferred); | |
2198 | } | |
2199 | ||
2200 | return more; | |
1217857f AE |
2201 | } |
2202 | ||
2169238d AE |
2203 | static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
2204 | { | |
2205 | struct rbd_img_request *img_request; | |
2206 | u32 which = obj_request->which; | |
2207 | bool more = true; | |
2208 | ||
6365d33a | 2209 | rbd_assert(obj_request_img_data_test(obj_request)); |
2169238d AE |
2210 | img_request = obj_request->img_request; |
2211 | ||
2212 | dout("%s: img %p obj %p\n", __func__, img_request, obj_request); | |
2213 | rbd_assert(img_request != NULL); | |
2169238d AE |
2214 | rbd_assert(img_request->obj_request_count > 0); |
2215 | rbd_assert(which != BAD_WHICH); | |
2216 | rbd_assert(which < img_request->obj_request_count); | |
2169238d AE |
2217 | |
2218 | spin_lock_irq(&img_request->completion_lock); | |
2219 | if (which != img_request->next_completion) | |
2220 | goto out; | |
2221 | ||
2222 | for_each_obj_request_from(img_request, obj_request) { | |
2169238d AE |
2223 | rbd_assert(more); |
2224 | rbd_assert(which < img_request->obj_request_count); | |
2225 | ||
2226 | if (!obj_request_done_test(obj_request)) | |
2227 | break; | |
1217857f | 2228 | more = rbd_img_obj_end_request(obj_request); |
2169238d AE |
2229 | which++; |
2230 | } | |
2231 | ||
2232 | rbd_assert(more ^ (which == img_request->obj_request_count)); | |
2233 | img_request->next_completion = which; | |
2234 | out: | |
2235 | spin_unlock_irq(&img_request->completion_lock); | |
0f2d5be7 | 2236 | rbd_img_request_put(img_request); |
2169238d AE |
2237 | |
2238 | if (!more) | |
2239 | rbd_img_request_complete(img_request); | |
2240 | } | |
2241 | ||
f1a4739f AE |
2242 | /* |
2243 | * Split up an image request into one or more object requests, each | |
2244 | * to a different object. The "type" parameter indicates whether | |
2245 | * "data_desc" is the pointer to the head of a list of bio | |
2246 | * structures, or the base of a page array. In either case this | |
2247 | * function assumes data_desc describes memory sufficient to hold | |
2248 | * all data described by the image request. | |
2249 | */ | |
2250 | static int rbd_img_request_fill(struct rbd_img_request *img_request, | |
2251 | enum obj_request_type type, | |
2252 | void *data_desc) | |
bf0d5f50 AE |
2253 | { |
2254 | struct rbd_device *rbd_dev = img_request->rbd_dev; | |
2255 | struct rbd_obj_request *obj_request = NULL; | |
2256 | struct rbd_obj_request *next_obj_request; | |
0c425248 | 2257 | bool write_request = img_request_write_test(img_request); |
a158073c | 2258 | struct bio *bio_list = NULL; |
f1a4739f | 2259 | unsigned int bio_offset = 0; |
a158073c | 2260 | struct page **pages = NULL; |
7da22d29 | 2261 | u64 img_offset; |
bf0d5f50 AE |
2262 | u64 resid; |
2263 | u16 opcode; | |
2264 | ||
f1a4739f AE |
2265 | dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
2266 | (int)type, data_desc); | |
37206ee5 | 2267 | |
430c28c3 | 2268 | opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ; |
7da22d29 | 2269 | img_offset = img_request->offset; |
bf0d5f50 | 2270 | resid = img_request->length; |
4dda41d3 | 2271 | rbd_assert(resid > 0); |
f1a4739f AE |
2272 | |
2273 | if (type == OBJ_REQUEST_BIO) { | |
2274 | bio_list = data_desc; | |
4f024f37 KO |
2275 | rbd_assert(img_offset == |
2276 | bio_list->bi_iter.bi_sector << SECTOR_SHIFT); | |
f1a4739f AE |
2277 | } else { |
2278 | rbd_assert(type == OBJ_REQUEST_PAGES); | |
2279 | pages = data_desc; | |
2280 | } | |
2281 | ||
bf0d5f50 | 2282 | while (resid) { |
2fa12320 | 2283 | struct ceph_osd_request *osd_req; |
bf0d5f50 | 2284 | const char *object_name; |
bf0d5f50 AE |
2285 | u64 offset; |
2286 | u64 length; | |
0ccd5926 | 2287 | unsigned int which = 0; |
bf0d5f50 | 2288 | |
7da22d29 | 2289 | object_name = rbd_segment_name(rbd_dev, img_offset); |
bf0d5f50 AE |
2290 | if (!object_name) |
2291 | goto out_unwind; | |
7da22d29 AE |
2292 | offset = rbd_segment_offset(rbd_dev, img_offset); |
2293 | length = rbd_segment_length(rbd_dev, img_offset, resid); | |
bf0d5f50 | 2294 | obj_request = rbd_obj_request_create(object_name, |
f1a4739f | 2295 | offset, length, type); |
78c2a44a AE |
2296 | /* object request has its own copy of the object name */ |
2297 | rbd_segment_name_free(object_name); | |
bf0d5f50 AE |
2298 | if (!obj_request) |
2299 | goto out_unwind; | |
62054da6 | 2300 | |
03507db6 JD |
2301 | /* |
2302 | * set obj_request->img_request before creating the | |
2303 | * osd_request so that it gets the right snapc | |
2304 | */ | |
2305 | rbd_img_obj_request_add(img_request, obj_request); | |
bf0d5f50 | 2306 | |
f1a4739f AE |
2307 | if (type == OBJ_REQUEST_BIO) { |
2308 | unsigned int clone_size; | |
2309 | ||
2310 | rbd_assert(length <= (u64)UINT_MAX); | |
2311 | clone_size = (unsigned int)length; | |
2312 | obj_request->bio_list = | |
2313 | bio_chain_clone_range(&bio_list, | |
2314 | &bio_offset, | |
2315 | clone_size, | |
2316 | GFP_ATOMIC); | |
2317 | if (!obj_request->bio_list) | |
62054da6 | 2318 | goto out_unwind; |
f1a4739f AE |
2319 | } else { |
2320 | unsigned int page_count; | |
2321 | ||
2322 | obj_request->pages = pages; | |
2323 | page_count = (u32)calc_pages_for(offset, length); | |
2324 | obj_request->page_count = page_count; | |
2325 | if ((offset + length) & ~PAGE_MASK) | |
2326 | page_count--; /* more on last page */ | |
2327 | pages += page_count; | |
2328 | } | |
bf0d5f50 | 2329 | |
0ccd5926 ID |
2330 | osd_req = rbd_osd_req_create(rbd_dev, write_request, |
2331 | (write_request ? 2 : 1), | |
deb236b3 | 2332 | obj_request); |
2fa12320 | 2333 | if (!osd_req) |
62054da6 | 2334 | goto out_unwind; |
2fa12320 | 2335 | obj_request->osd_req = osd_req; |
2169238d | 2336 | obj_request->callback = rbd_img_obj_callback; |
0f2d5be7 | 2337 | rbd_img_request_get(img_request); |
430c28c3 | 2338 | |
0ccd5926 ID |
2339 | if (write_request) { |
2340 | osd_req_op_alloc_hint_init(osd_req, which, | |
2341 | rbd_obj_bytes(&rbd_dev->header), | |
2342 | rbd_obj_bytes(&rbd_dev->header)); | |
2343 | which++; | |
2344 | } | |
2345 | ||
2346 | osd_req_op_extent_init(osd_req, which, opcode, offset, length, | |
2347 | 0, 0); | |
f1a4739f | 2348 | if (type == OBJ_REQUEST_BIO) |
0ccd5926 | 2349 | osd_req_op_extent_osd_data_bio(osd_req, which, |
f1a4739f AE |
2350 | obj_request->bio_list, length); |
2351 | else | |
0ccd5926 | 2352 | osd_req_op_extent_osd_data_pages(osd_req, which, |
f1a4739f AE |
2353 | obj_request->pages, length, |
2354 | offset & ~PAGE_MASK, false, false); | |
9d4df01f AE |
2355 | |
2356 | if (write_request) | |
2357 | rbd_osd_req_format_write(obj_request); | |
2358 | else | |
2359 | rbd_osd_req_format_read(obj_request); | |
430c28c3 | 2360 | |
7da22d29 | 2361 | obj_request->img_offset = img_offset; |
bf0d5f50 | 2362 | |
7da22d29 | 2363 | img_offset += length; |
bf0d5f50 AE |
2364 | resid -= length; |
2365 | } | |
2366 | ||
2367 | return 0; | |
2368 | ||
bf0d5f50 AE |
2369 | out_unwind: |
2370 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) | |
42dd037c | 2371 | rbd_img_obj_request_del(img_request, obj_request); |
bf0d5f50 AE |
2372 | |
2373 | return -ENOMEM; | |
2374 | } | |
2375 | ||
0eefd470 AE |
2376 | static void |
2377 | rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request) | |
2378 | { | |
2379 | struct rbd_img_request *img_request; | |
2380 | struct rbd_device *rbd_dev; | |
ebda6408 | 2381 | struct page **pages; |
0eefd470 AE |
2382 | u32 page_count; |
2383 | ||
2384 | rbd_assert(obj_request->type == OBJ_REQUEST_BIO); | |
2385 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2386 | img_request = obj_request->img_request; | |
2387 | rbd_assert(img_request); | |
2388 | ||
2389 | rbd_dev = img_request->rbd_dev; | |
2390 | rbd_assert(rbd_dev); | |
0eefd470 | 2391 | |
ebda6408 AE |
2392 | pages = obj_request->copyup_pages; |
2393 | rbd_assert(pages != NULL); | |
0eefd470 | 2394 | obj_request->copyup_pages = NULL; |
ebda6408 AE |
2395 | page_count = obj_request->copyup_page_count; |
2396 | rbd_assert(page_count); | |
2397 | obj_request->copyup_page_count = 0; | |
2398 | ceph_release_page_vector(pages, page_count); | |
0eefd470 AE |
2399 | |
2400 | /* | |
2401 | * We want the transfer count to reflect the size of the | |
2402 | * original write request. There is no such thing as a | |
2403 | * successful short write, so if the request was successful | |
2404 | * we can just set it to the originally-requested length. | |
2405 | */ | |
2406 | if (!obj_request->result) | |
2407 | obj_request->xferred = obj_request->length; | |
2408 | ||
2409 | /* Finish up with the normal image object callback */ | |
2410 | ||
2411 | rbd_img_obj_callback(obj_request); | |
2412 | } | |
2413 | ||
3d7efd18 AE |
2414 | static void |
2415 | rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) | |
2416 | { | |
2417 | struct rbd_obj_request *orig_request; | |
0eefd470 AE |
2418 | struct ceph_osd_request *osd_req; |
2419 | struct ceph_osd_client *osdc; | |
2420 | struct rbd_device *rbd_dev; | |
3d7efd18 | 2421 | struct page **pages; |
ebda6408 | 2422 | u32 page_count; |
bbea1c1a | 2423 | int img_result; |
ebda6408 | 2424 | u64 parent_length; |
b91f09f1 AE |
2425 | u64 offset; |
2426 | u64 length; | |
3d7efd18 AE |
2427 | |
2428 | rbd_assert(img_request_child_test(img_request)); | |
2429 | ||
2430 | /* First get what we need from the image request */ | |
2431 | ||
2432 | pages = img_request->copyup_pages; | |
2433 | rbd_assert(pages != NULL); | |
2434 | img_request->copyup_pages = NULL; | |
ebda6408 AE |
2435 | page_count = img_request->copyup_page_count; |
2436 | rbd_assert(page_count); | |
2437 | img_request->copyup_page_count = 0; | |
3d7efd18 AE |
2438 | |
2439 | orig_request = img_request->obj_request; | |
2440 | rbd_assert(orig_request != NULL); | |
b91f09f1 | 2441 | rbd_assert(obj_request_type_valid(orig_request->type)); |
bbea1c1a | 2442 | img_result = img_request->result; |
ebda6408 AE |
2443 | parent_length = img_request->length; |
2444 | rbd_assert(parent_length == img_request->xferred); | |
91c6febb | 2445 | rbd_img_request_put(img_request); |
3d7efd18 | 2446 | |
91c6febb AE |
2447 | rbd_assert(orig_request->img_request); |
2448 | rbd_dev = orig_request->img_request->rbd_dev; | |
0eefd470 | 2449 | rbd_assert(rbd_dev); |
0eefd470 | 2450 | |
bbea1c1a AE |
2451 | /* |
2452 | * If the overlap has become 0 (most likely because the | |
2453 | * image has been flattened) we need to free the pages | |
2454 | * and re-submit the original write request. | |
2455 | */ | |
2456 | if (!rbd_dev->parent_overlap) { | |
2457 | struct ceph_osd_client *osdc; | |
3d7efd18 | 2458 | |
bbea1c1a AE |
2459 | ceph_release_page_vector(pages, page_count); |
2460 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2461 | img_result = rbd_obj_request_submit(osdc, orig_request); | |
2462 | if (!img_result) | |
2463 | return; | |
2464 | } | |
0eefd470 | 2465 | |
bbea1c1a | 2466 | if (img_result) |
0eefd470 | 2467 | goto out_err; |
0eefd470 | 2468 | |
8785b1d4 AE |
2469 | /* |
2470 | * The original osd request is of no use to use any more. | |
0ccd5926 | 2471 | * We need a new one that can hold the three ops in a copyup |
8785b1d4 AE |
2472 | * request. Allocate the new copyup osd request for the |
2473 | * original request, and release the old one. | |
2474 | */ | |
bbea1c1a | 2475 | img_result = -ENOMEM; |
0eefd470 AE |
2476 | osd_req = rbd_osd_req_create_copyup(orig_request); |
2477 | if (!osd_req) | |
2478 | goto out_err; | |
8785b1d4 | 2479 | rbd_osd_req_destroy(orig_request->osd_req); |
0eefd470 AE |
2480 | orig_request->osd_req = osd_req; |
2481 | orig_request->copyup_pages = pages; | |
ebda6408 | 2482 | orig_request->copyup_page_count = page_count; |
3d7efd18 | 2483 | |
0eefd470 | 2484 | /* Initialize the copyup op */ |
3d7efd18 | 2485 | |
0eefd470 | 2486 | osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
ebda6408 | 2487 | osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
0eefd470 | 2488 | false, false); |
3d7efd18 | 2489 | |
0ccd5926 ID |
2490 | /* Then the hint op */ |
2491 | ||
2492 | osd_req_op_alloc_hint_init(osd_req, 1, rbd_obj_bytes(&rbd_dev->header), | |
2493 | rbd_obj_bytes(&rbd_dev->header)); | |
2494 | ||
2495 | /* And the original write request op */ | |
0eefd470 | 2496 | |
b91f09f1 AE |
2497 | offset = orig_request->offset; |
2498 | length = orig_request->length; | |
0ccd5926 | 2499 | osd_req_op_extent_init(osd_req, 2, CEPH_OSD_OP_WRITE, |
b91f09f1 AE |
2500 | offset, length, 0, 0); |
2501 | if (orig_request->type == OBJ_REQUEST_BIO) | |
0ccd5926 | 2502 | osd_req_op_extent_osd_data_bio(osd_req, 2, |
b91f09f1 AE |
2503 | orig_request->bio_list, length); |
2504 | else | |
0ccd5926 | 2505 | osd_req_op_extent_osd_data_pages(osd_req, 2, |
b91f09f1 AE |
2506 | orig_request->pages, length, |
2507 | offset & ~PAGE_MASK, false, false); | |
0eefd470 AE |
2508 | |
2509 | rbd_osd_req_format_write(orig_request); | |
2510 | ||
2511 | /* All set, send it off. */ | |
2512 | ||
2513 | orig_request->callback = rbd_img_obj_copyup_callback; | |
2514 | osdc = &rbd_dev->rbd_client->client->osdc; | |
bbea1c1a AE |
2515 | img_result = rbd_obj_request_submit(osdc, orig_request); |
2516 | if (!img_result) | |
0eefd470 AE |
2517 | return; |
2518 | out_err: | |
2519 | /* Record the error code and complete the request */ | |
2520 | ||
bbea1c1a | 2521 | orig_request->result = img_result; |
0eefd470 AE |
2522 | orig_request->xferred = 0; |
2523 | obj_request_done_set(orig_request); | |
2524 | rbd_obj_request_complete(orig_request); | |
3d7efd18 AE |
2525 | } |
2526 | ||
2527 | /* | |
2528 | * Read from the parent image the range of data that covers the | |
2529 | * entire target of the given object request. This is used for | |
2530 | * satisfying a layered image write request when the target of an | |
2531 | * object request from the image request does not exist. | |
2532 | * | |
2533 | * A page array big enough to hold the returned data is allocated | |
2534 | * and supplied to rbd_img_request_fill() as the "data descriptor." | |
2535 | * When the read completes, this page array will be transferred to | |
2536 | * the original object request for the copyup operation. | |
2537 | * | |
2538 | * If an error occurs, record it as the result of the original | |
2539 | * object request and mark it done so it gets completed. | |
2540 | */ | |
2541 | static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) | |
2542 | { | |
2543 | struct rbd_img_request *img_request = NULL; | |
2544 | struct rbd_img_request *parent_request = NULL; | |
2545 | struct rbd_device *rbd_dev; | |
2546 | u64 img_offset; | |
2547 | u64 length; | |
2548 | struct page **pages = NULL; | |
2549 | u32 page_count; | |
2550 | int result; | |
2551 | ||
2552 | rbd_assert(obj_request_img_data_test(obj_request)); | |
b91f09f1 | 2553 | rbd_assert(obj_request_type_valid(obj_request->type)); |
3d7efd18 AE |
2554 | |
2555 | img_request = obj_request->img_request; | |
2556 | rbd_assert(img_request != NULL); | |
2557 | rbd_dev = img_request->rbd_dev; | |
2558 | rbd_assert(rbd_dev->parent != NULL); | |
2559 | ||
2560 | /* | |
2561 | * Determine the byte range covered by the object in the | |
2562 | * child image to which the original request was to be sent. | |
2563 | */ | |
2564 | img_offset = obj_request->img_offset - obj_request->offset; | |
2565 | length = (u64)1 << rbd_dev->header.obj_order; | |
2566 | ||
a9e8ba2c AE |
2567 | /* |
2568 | * There is no defined parent data beyond the parent | |
2569 | * overlap, so limit what we read at that boundary if | |
2570 | * necessary. | |
2571 | */ | |
2572 | if (img_offset + length > rbd_dev->parent_overlap) { | |
2573 | rbd_assert(img_offset < rbd_dev->parent_overlap); | |
2574 | length = rbd_dev->parent_overlap - img_offset; | |
2575 | } | |
2576 | ||
3d7efd18 AE |
2577 | /* |
2578 | * Allocate a page array big enough to receive the data read | |
2579 | * from the parent. | |
2580 | */ | |
2581 | page_count = (u32)calc_pages_for(0, length); | |
2582 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2583 | if (IS_ERR(pages)) { | |
2584 | result = PTR_ERR(pages); | |
2585 | pages = NULL; | |
2586 | goto out_err; | |
2587 | } | |
2588 | ||
2589 | result = -ENOMEM; | |
e93f3152 AE |
2590 | parent_request = rbd_parent_request_create(obj_request, |
2591 | img_offset, length); | |
3d7efd18 AE |
2592 | if (!parent_request) |
2593 | goto out_err; | |
3d7efd18 AE |
2594 | |
2595 | result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); | |
2596 | if (result) | |
2597 | goto out_err; | |
2598 | parent_request->copyup_pages = pages; | |
ebda6408 | 2599 | parent_request->copyup_page_count = page_count; |
3d7efd18 AE |
2600 | |
2601 | parent_request->callback = rbd_img_obj_parent_read_full_callback; | |
2602 | result = rbd_img_request_submit(parent_request); | |
2603 | if (!result) | |
2604 | return 0; | |
2605 | ||
2606 | parent_request->copyup_pages = NULL; | |
ebda6408 | 2607 | parent_request->copyup_page_count = 0; |
3d7efd18 AE |
2608 | parent_request->obj_request = NULL; |
2609 | rbd_obj_request_put(obj_request); | |
2610 | out_err: | |
2611 | if (pages) | |
2612 | ceph_release_page_vector(pages, page_count); | |
2613 | if (parent_request) | |
2614 | rbd_img_request_put(parent_request); | |
2615 | obj_request->result = result; | |
2616 | obj_request->xferred = 0; | |
2617 | obj_request_done_set(obj_request); | |
2618 | ||
2619 | return result; | |
2620 | } | |
2621 | ||
c5b5ef6c AE |
2622 | static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
2623 | { | |
c5b5ef6c | 2624 | struct rbd_obj_request *orig_request; |
638f5abe | 2625 | struct rbd_device *rbd_dev; |
c5b5ef6c AE |
2626 | int result; |
2627 | ||
2628 | rbd_assert(!obj_request_img_data_test(obj_request)); | |
2629 | ||
2630 | /* | |
2631 | * All we need from the object request is the original | |
2632 | * request and the result of the STAT op. Grab those, then | |
2633 | * we're done with the request. | |
2634 | */ | |
2635 | orig_request = obj_request->obj_request; | |
2636 | obj_request->obj_request = NULL; | |
912c317d | 2637 | rbd_obj_request_put(orig_request); |
c5b5ef6c AE |
2638 | rbd_assert(orig_request); |
2639 | rbd_assert(orig_request->img_request); | |
2640 | ||
2641 | result = obj_request->result; | |
2642 | obj_request->result = 0; | |
2643 | ||
2644 | dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, | |
2645 | obj_request, orig_request, result, | |
2646 | obj_request->xferred, obj_request->length); | |
2647 | rbd_obj_request_put(obj_request); | |
2648 | ||
638f5abe AE |
2649 | /* |
2650 | * If the overlap has become 0 (most likely because the | |
2651 | * image has been flattened) we need to free the pages | |
2652 | * and re-submit the original write request. | |
2653 | */ | |
2654 | rbd_dev = orig_request->img_request->rbd_dev; | |
2655 | if (!rbd_dev->parent_overlap) { | |
2656 | struct ceph_osd_client *osdc; | |
2657 | ||
638f5abe AE |
2658 | osdc = &rbd_dev->rbd_client->client->osdc; |
2659 | result = rbd_obj_request_submit(osdc, orig_request); | |
2660 | if (!result) | |
2661 | return; | |
2662 | } | |
c5b5ef6c AE |
2663 | |
2664 | /* | |
2665 | * Our only purpose here is to determine whether the object | |
2666 | * exists, and we don't want to treat the non-existence as | |
2667 | * an error. If something else comes back, transfer the | |
2668 | * error to the original request and complete it now. | |
2669 | */ | |
2670 | if (!result) { | |
2671 | obj_request_existence_set(orig_request, true); | |
2672 | } else if (result == -ENOENT) { | |
2673 | obj_request_existence_set(orig_request, false); | |
2674 | } else if (result) { | |
2675 | orig_request->result = result; | |
3d7efd18 | 2676 | goto out; |
c5b5ef6c AE |
2677 | } |
2678 | ||
2679 | /* | |
2680 | * Resubmit the original request now that we have recorded | |
2681 | * whether the target object exists. | |
2682 | */ | |
b454e36d | 2683 | orig_request->result = rbd_img_obj_request_submit(orig_request); |
3d7efd18 | 2684 | out: |
c5b5ef6c AE |
2685 | if (orig_request->result) |
2686 | rbd_obj_request_complete(orig_request); | |
c5b5ef6c AE |
2687 | } |
2688 | ||
2689 | static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) | |
2690 | { | |
2691 | struct rbd_obj_request *stat_request; | |
2692 | struct rbd_device *rbd_dev; | |
2693 | struct ceph_osd_client *osdc; | |
2694 | struct page **pages = NULL; | |
2695 | u32 page_count; | |
2696 | size_t size; | |
2697 | int ret; | |
2698 | ||
2699 | /* | |
2700 | * The response data for a STAT call consists of: | |
2701 | * le64 length; | |
2702 | * struct { | |
2703 | * le32 tv_sec; | |
2704 | * le32 tv_nsec; | |
2705 | * } mtime; | |
2706 | */ | |
2707 | size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); | |
2708 | page_count = (u32)calc_pages_for(0, size); | |
2709 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
2710 | if (IS_ERR(pages)) | |
2711 | return PTR_ERR(pages); | |
2712 | ||
2713 | ret = -ENOMEM; | |
2714 | stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0, | |
2715 | OBJ_REQUEST_PAGES); | |
2716 | if (!stat_request) | |
2717 | goto out; | |
2718 | ||
2719 | rbd_obj_request_get(obj_request); | |
2720 | stat_request->obj_request = obj_request; | |
2721 | stat_request->pages = pages; | |
2722 | stat_request->page_count = page_count; | |
2723 | ||
2724 | rbd_assert(obj_request->img_request); | |
2725 | rbd_dev = obj_request->img_request->rbd_dev; | |
deb236b3 ID |
2726 | stat_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
2727 | stat_request); | |
c5b5ef6c AE |
2728 | if (!stat_request->osd_req) |
2729 | goto out; | |
2730 | stat_request->callback = rbd_img_obj_exists_callback; | |
2731 | ||
2732 | osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT); | |
2733 | osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, | |
2734 | false, false); | |
9d4df01f | 2735 | rbd_osd_req_format_read(stat_request); |
c5b5ef6c AE |
2736 | |
2737 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2738 | ret = rbd_obj_request_submit(osdc, stat_request); | |
2739 | out: | |
2740 | if (ret) | |
2741 | rbd_obj_request_put(obj_request); | |
2742 | ||
2743 | return ret; | |
2744 | } | |
2745 | ||
b454e36d AE |
2746 | static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
2747 | { | |
2748 | struct rbd_img_request *img_request; | |
a9e8ba2c | 2749 | struct rbd_device *rbd_dev; |
3d7efd18 | 2750 | bool known; |
b454e36d AE |
2751 | |
2752 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2753 | ||
2754 | img_request = obj_request->img_request; | |
2755 | rbd_assert(img_request); | |
a9e8ba2c | 2756 | rbd_dev = img_request->rbd_dev; |
b454e36d | 2757 | |
b454e36d | 2758 | /* |
a9e8ba2c AE |
2759 | * Only writes to layered images need special handling. |
2760 | * Reads and non-layered writes are simple object requests. | |
2761 | * Layered writes that start beyond the end of the overlap | |
2762 | * with the parent have no parent data, so they too are | |
2763 | * simple object requests. Finally, if the target object is | |
2764 | * known to already exist, its parent data has already been | |
2765 | * copied, so a write to the object can also be handled as a | |
2766 | * simple object request. | |
b454e36d AE |
2767 | */ |
2768 | if (!img_request_write_test(img_request) || | |
2769 | !img_request_layered_test(img_request) || | |
9638556a | 2770 | !obj_request_overlaps_parent(obj_request) || |
3d7efd18 AE |
2771 | ((known = obj_request_known_test(obj_request)) && |
2772 | obj_request_exists_test(obj_request))) { | |
b454e36d AE |
2773 | |
2774 | struct rbd_device *rbd_dev; | |
2775 | struct ceph_osd_client *osdc; | |
2776 | ||
2777 | rbd_dev = obj_request->img_request->rbd_dev; | |
2778 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2779 | ||
2780 | return rbd_obj_request_submit(osdc, obj_request); | |
2781 | } | |
2782 | ||
2783 | /* | |
3d7efd18 AE |
2784 | * It's a layered write. The target object might exist but |
2785 | * we may not know that yet. If we know it doesn't exist, | |
2786 | * start by reading the data for the full target object from | |
2787 | * the parent so we can use it for a copyup to the target. | |
b454e36d | 2788 | */ |
3d7efd18 AE |
2789 | if (known) |
2790 | return rbd_img_obj_parent_read_full(obj_request); | |
2791 | ||
2792 | /* We don't know whether the target exists. Go find out. */ | |
b454e36d AE |
2793 | |
2794 | return rbd_img_obj_exists_submit(obj_request); | |
2795 | } | |
2796 | ||
bf0d5f50 AE |
2797 | static int rbd_img_request_submit(struct rbd_img_request *img_request) |
2798 | { | |
bf0d5f50 | 2799 | struct rbd_obj_request *obj_request; |
46faeed4 | 2800 | struct rbd_obj_request *next_obj_request; |
bf0d5f50 | 2801 | |
37206ee5 | 2802 | dout("%s: img %p\n", __func__, img_request); |
46faeed4 | 2803 | for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
bf0d5f50 AE |
2804 | int ret; |
2805 | ||
b454e36d | 2806 | ret = rbd_img_obj_request_submit(obj_request); |
bf0d5f50 AE |
2807 | if (ret) |
2808 | return ret; | |
bf0d5f50 AE |
2809 | } |
2810 | ||
2811 | return 0; | |
2812 | } | |
8b3e1a56 AE |
2813 | |
2814 | static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) | |
2815 | { | |
2816 | struct rbd_obj_request *obj_request; | |
a9e8ba2c AE |
2817 | struct rbd_device *rbd_dev; |
2818 | u64 obj_end; | |
02c74fba AE |
2819 | u64 img_xferred; |
2820 | int img_result; | |
8b3e1a56 AE |
2821 | |
2822 | rbd_assert(img_request_child_test(img_request)); | |
2823 | ||
02c74fba AE |
2824 | /* First get what we need from the image request and release it */ |
2825 | ||
8b3e1a56 | 2826 | obj_request = img_request->obj_request; |
02c74fba AE |
2827 | img_xferred = img_request->xferred; |
2828 | img_result = img_request->result; | |
2829 | rbd_img_request_put(img_request); | |
2830 | ||
2831 | /* | |
2832 | * If the overlap has become 0 (most likely because the | |
2833 | * image has been flattened) we need to re-submit the | |
2834 | * original request. | |
2835 | */ | |
a9e8ba2c AE |
2836 | rbd_assert(obj_request); |
2837 | rbd_assert(obj_request->img_request); | |
02c74fba AE |
2838 | rbd_dev = obj_request->img_request->rbd_dev; |
2839 | if (!rbd_dev->parent_overlap) { | |
2840 | struct ceph_osd_client *osdc; | |
2841 | ||
2842 | osdc = &rbd_dev->rbd_client->client->osdc; | |
2843 | img_result = rbd_obj_request_submit(osdc, obj_request); | |
2844 | if (!img_result) | |
2845 | return; | |
2846 | } | |
a9e8ba2c | 2847 | |
02c74fba | 2848 | obj_request->result = img_result; |
a9e8ba2c AE |
2849 | if (obj_request->result) |
2850 | goto out; | |
2851 | ||
2852 | /* | |
2853 | * We need to zero anything beyond the parent overlap | |
2854 | * boundary. Since rbd_img_obj_request_read_callback() | |
2855 | * will zero anything beyond the end of a short read, an | |
2856 | * easy way to do this is to pretend the data from the | |
2857 | * parent came up short--ending at the overlap boundary. | |
2858 | */ | |
2859 | rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); | |
2860 | obj_end = obj_request->img_offset + obj_request->length; | |
a9e8ba2c AE |
2861 | if (obj_end > rbd_dev->parent_overlap) { |
2862 | u64 xferred = 0; | |
2863 | ||
2864 | if (obj_request->img_offset < rbd_dev->parent_overlap) | |
2865 | xferred = rbd_dev->parent_overlap - | |
2866 | obj_request->img_offset; | |
8b3e1a56 | 2867 | |
02c74fba | 2868 | obj_request->xferred = min(img_xferred, xferred); |
a9e8ba2c | 2869 | } else { |
02c74fba | 2870 | obj_request->xferred = img_xferred; |
a9e8ba2c AE |
2871 | } |
2872 | out: | |
8b3e1a56 AE |
2873 | rbd_img_obj_request_read_callback(obj_request); |
2874 | rbd_obj_request_complete(obj_request); | |
2875 | } | |
2876 | ||
2877 | static void rbd_img_parent_read(struct rbd_obj_request *obj_request) | |
2878 | { | |
8b3e1a56 AE |
2879 | struct rbd_img_request *img_request; |
2880 | int result; | |
2881 | ||
2882 | rbd_assert(obj_request_img_data_test(obj_request)); | |
2883 | rbd_assert(obj_request->img_request != NULL); | |
2884 | rbd_assert(obj_request->result == (s32) -ENOENT); | |
5b2ab72d | 2885 | rbd_assert(obj_request_type_valid(obj_request->type)); |
8b3e1a56 | 2886 | |
8b3e1a56 | 2887 | /* rbd_read_finish(obj_request, obj_request->length); */ |
e93f3152 | 2888 | img_request = rbd_parent_request_create(obj_request, |
8b3e1a56 | 2889 | obj_request->img_offset, |
e93f3152 | 2890 | obj_request->length); |
8b3e1a56 AE |
2891 | result = -ENOMEM; |
2892 | if (!img_request) | |
2893 | goto out_err; | |
2894 | ||
5b2ab72d AE |
2895 | if (obj_request->type == OBJ_REQUEST_BIO) |
2896 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, | |
2897 | obj_request->bio_list); | |
2898 | else | |
2899 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, | |
2900 | obj_request->pages); | |
8b3e1a56 AE |
2901 | if (result) |
2902 | goto out_err; | |
2903 | ||
2904 | img_request->callback = rbd_img_parent_read_callback; | |
2905 | result = rbd_img_request_submit(img_request); | |
2906 | if (result) | |
2907 | goto out_err; | |
2908 | ||
2909 | return; | |
2910 | out_err: | |
2911 | if (img_request) | |
2912 | rbd_img_request_put(img_request); | |
2913 | obj_request->result = result; | |
2914 | obj_request->xferred = 0; | |
2915 | obj_request_done_set(obj_request); | |
2916 | } | |
bf0d5f50 | 2917 | |
20e0af67 | 2918 | static int rbd_obj_notify_ack_sync(struct rbd_device *rbd_dev, u64 notify_id) |
b8d70035 AE |
2919 | { |
2920 | struct rbd_obj_request *obj_request; | |
2169238d | 2921 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
b8d70035 AE |
2922 | int ret; |
2923 | ||
2924 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2925 | OBJ_REQUEST_NODATA); | |
2926 | if (!obj_request) | |
2927 | return -ENOMEM; | |
2928 | ||
2929 | ret = -ENOMEM; | |
deb236b3 ID |
2930 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
2931 | obj_request); | |
b8d70035 AE |
2932 | if (!obj_request->osd_req) |
2933 | goto out; | |
2934 | ||
c99d2d4a | 2935 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK, |
cc4a38bd | 2936 | notify_id, 0, 0); |
9d4df01f | 2937 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 2938 | |
b8d70035 | 2939 | ret = rbd_obj_request_submit(osdc, obj_request); |
cf81b60e | 2940 | if (ret) |
20e0af67 JD |
2941 | goto out; |
2942 | ret = rbd_obj_request_wait(obj_request); | |
2943 | out: | |
2944 | rbd_obj_request_put(obj_request); | |
b8d70035 AE |
2945 | |
2946 | return ret; | |
2947 | } | |
2948 | ||
2949 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
2950 | { | |
2951 | struct rbd_device *rbd_dev = (struct rbd_device *)data; | |
e627db08 | 2952 | int ret; |
b8d70035 AE |
2953 | |
2954 | if (!rbd_dev) | |
2955 | return; | |
2956 | ||
37206ee5 | 2957 | dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__, |
cc4a38bd AE |
2958 | rbd_dev->header_name, (unsigned long long)notify_id, |
2959 | (unsigned int)opcode); | |
52bb1f9b ID |
2960 | |
2961 | /* | |
2962 | * Until adequate refresh error handling is in place, there is | |
2963 | * not much we can do here, except warn. | |
2964 | * | |
2965 | * See http://tracker.ceph.com/issues/5040 | |
2966 | */ | |
e627db08 AE |
2967 | ret = rbd_dev_refresh(rbd_dev); |
2968 | if (ret) | |
9584d508 | 2969 | rbd_warn(rbd_dev, "refresh failed: %d", ret); |
b8d70035 | 2970 | |
52bb1f9b ID |
2971 | ret = rbd_obj_notify_ack_sync(rbd_dev, notify_id); |
2972 | if (ret) | |
9584d508 | 2973 | rbd_warn(rbd_dev, "notify_ack ret %d", ret); |
b8d70035 AE |
2974 | } |
2975 | ||
bb040aa0 ID |
2976 | /* |
2977 | * Send a (un)watch request and wait for the ack. Return a request | |
2978 | * with a ref held on success or error. | |
2979 | */ | |
2980 | static struct rbd_obj_request *rbd_obj_watch_request_helper( | |
2981 | struct rbd_device *rbd_dev, | |
2982 | bool watch) | |
2983 | { | |
2984 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
2985 | struct rbd_obj_request *obj_request; | |
2986 | int ret; | |
2987 | ||
2988 | obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, | |
2989 | OBJ_REQUEST_NODATA); | |
2990 | if (!obj_request) | |
2991 | return ERR_PTR(-ENOMEM); | |
2992 | ||
2993 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1, | |
2994 | obj_request); | |
2995 | if (!obj_request->osd_req) { | |
2996 | ret = -ENOMEM; | |
2997 | goto out; | |
2998 | } | |
2999 | ||
3000 | osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH, | |
3001 | rbd_dev->watch_event->cookie, 0, watch); | |
3002 | rbd_osd_req_format_write(obj_request); | |
3003 | ||
3004 | if (watch) | |
3005 | ceph_osdc_set_request_linger(osdc, obj_request->osd_req); | |
3006 | ||
3007 | ret = rbd_obj_request_submit(osdc, obj_request); | |
3008 | if (ret) | |
3009 | goto out; | |
3010 | ||
3011 | ret = rbd_obj_request_wait(obj_request); | |
3012 | if (ret) | |
3013 | goto out; | |
3014 | ||
3015 | ret = obj_request->result; | |
3016 | if (ret) { | |
3017 | if (watch) | |
3018 | rbd_obj_request_end(obj_request); | |
3019 | goto out; | |
3020 | } | |
3021 | ||
3022 | return obj_request; | |
3023 | ||
3024 | out: | |
3025 | rbd_obj_request_put(obj_request); | |
3026 | return ERR_PTR(ret); | |
3027 | } | |
3028 | ||
9969ebc5 | 3029 | /* |
b30a01f2 | 3030 | * Initiate a watch request, synchronously. |
9969ebc5 | 3031 | */ |
b30a01f2 | 3032 | static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev) |
9969ebc5 AE |
3033 | { |
3034 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; | |
3035 | struct rbd_obj_request *obj_request; | |
9969ebc5 AE |
3036 | int ret; |
3037 | ||
b30a01f2 ID |
3038 | rbd_assert(!rbd_dev->watch_event); |
3039 | rbd_assert(!rbd_dev->watch_request); | |
9969ebc5 | 3040 | |
b30a01f2 ID |
3041 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
3042 | &rbd_dev->watch_event); | |
3043 | if (ret < 0) | |
3044 | return ret; | |
3045 | ||
76756a51 ID |
3046 | obj_request = rbd_obj_watch_request_helper(rbd_dev, true); |
3047 | if (IS_ERR(obj_request)) { | |
3048 | ceph_osdc_cancel_event(rbd_dev->watch_event); | |
3049 | rbd_dev->watch_event = NULL; | |
3050 | return PTR_ERR(obj_request); | |
b30a01f2 | 3051 | } |
9969ebc5 | 3052 | |
8eb87565 AE |
3053 | /* |
3054 | * A watch request is set to linger, so the underlying osd | |
3055 | * request won't go away until we unregister it. We retain | |
3056 | * a pointer to the object request during that time (in | |
76756a51 ID |
3057 | * rbd_dev->watch_request), so we'll keep a reference to it. |
3058 | * We'll drop that reference after we've unregistered it in | |
3059 | * rbd_dev_header_unwatch_sync(). | |
8eb87565 | 3060 | */ |
b30a01f2 | 3061 | rbd_dev->watch_request = obj_request; |
8eb87565 | 3062 | |
b30a01f2 | 3063 | return 0; |
b30a01f2 ID |
3064 | } |
3065 | ||
3066 | /* | |
3067 | * Tear down a watch request, synchronously. | |
3068 | */ | |
76756a51 | 3069 | static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev) |
b30a01f2 | 3070 | { |
b30a01f2 | 3071 | struct rbd_obj_request *obj_request; |
b30a01f2 ID |
3072 | |
3073 | rbd_assert(rbd_dev->watch_event); | |
3074 | rbd_assert(rbd_dev->watch_request); | |
3075 | ||
76756a51 | 3076 | rbd_obj_request_end(rbd_dev->watch_request); |
8eb87565 AE |
3077 | rbd_obj_request_put(rbd_dev->watch_request); |
3078 | rbd_dev->watch_request = NULL; | |
b30a01f2 | 3079 | |
76756a51 ID |
3080 | obj_request = rbd_obj_watch_request_helper(rbd_dev, false); |
3081 | if (!IS_ERR(obj_request)) | |
3082 | rbd_obj_request_put(obj_request); | |
3083 | else | |
3084 | rbd_warn(rbd_dev, "unable to tear down watch request (%ld)", | |
3085 | PTR_ERR(obj_request)); | |
3086 | ||
9969ebc5 AE |
3087 | ceph_osdc_cancel_event(rbd_dev->watch_event); |
3088 | rbd_dev->watch_event = NULL; | |
fca27065 ID |
3089 | } |
3090 | ||
36be9a76 | 3091 | /* |
f40eb349 AE |
3092 | * Synchronous osd object method call. Returns the number of bytes |
3093 | * returned in the outbound buffer, or a negative error code. | |
36be9a76 AE |
3094 | */ |
3095 | static int rbd_obj_method_sync(struct rbd_device *rbd_dev, | |
3096 | const char *object_name, | |
3097 | const char *class_name, | |
3098 | const char *method_name, | |
4157976b | 3099 | const void *outbound, |
36be9a76 | 3100 | size_t outbound_size, |
4157976b | 3101 | void *inbound, |
e2a58ee5 | 3102 | size_t inbound_size) |
36be9a76 | 3103 | { |
2169238d | 3104 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
36be9a76 | 3105 | struct rbd_obj_request *obj_request; |
36be9a76 AE |
3106 | struct page **pages; |
3107 | u32 page_count; | |
3108 | int ret; | |
3109 | ||
3110 | /* | |
6010a451 AE |
3111 | * Method calls are ultimately read operations. The result |
3112 | * should placed into the inbound buffer provided. They | |
3113 | * also supply outbound data--parameters for the object | |
3114 | * method. Currently if this is present it will be a | |
3115 | * snapshot id. | |
36be9a76 | 3116 | */ |
57385b51 | 3117 | page_count = (u32)calc_pages_for(0, inbound_size); |
36be9a76 AE |
3118 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
3119 | if (IS_ERR(pages)) | |
3120 | return PTR_ERR(pages); | |
3121 | ||
3122 | ret = -ENOMEM; | |
6010a451 | 3123 | obj_request = rbd_obj_request_create(object_name, 0, inbound_size, |
36be9a76 AE |
3124 | OBJ_REQUEST_PAGES); |
3125 | if (!obj_request) | |
3126 | goto out; | |
3127 | ||
3128 | obj_request->pages = pages; | |
3129 | obj_request->page_count = page_count; | |
3130 | ||
deb236b3 ID |
3131 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
3132 | obj_request); | |
36be9a76 AE |
3133 | if (!obj_request->osd_req) |
3134 | goto out; | |
3135 | ||
c99d2d4a | 3136 | osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL, |
04017e29 AE |
3137 | class_name, method_name); |
3138 | if (outbound_size) { | |
3139 | struct ceph_pagelist *pagelist; | |
3140 | ||
3141 | pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); | |
3142 | if (!pagelist) | |
3143 | goto out; | |
3144 | ||
3145 | ceph_pagelist_init(pagelist); | |
3146 | ceph_pagelist_append(pagelist, outbound, outbound_size); | |
3147 | osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0, | |
3148 | pagelist); | |
3149 | } | |
a4ce40a9 AE |
3150 | osd_req_op_cls_response_data_pages(obj_request->osd_req, 0, |
3151 | obj_request->pages, inbound_size, | |
44cd188d | 3152 | 0, false, false); |
9d4df01f | 3153 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3154 | |
36be9a76 AE |
3155 | ret = rbd_obj_request_submit(osdc, obj_request); |
3156 | if (ret) | |
3157 | goto out; | |
3158 | ret = rbd_obj_request_wait(obj_request); | |
3159 | if (ret) | |
3160 | goto out; | |
3161 | ||
3162 | ret = obj_request->result; | |
3163 | if (ret < 0) | |
3164 | goto out; | |
57385b51 AE |
3165 | |
3166 | rbd_assert(obj_request->xferred < (u64)INT_MAX); | |
3167 | ret = (int)obj_request->xferred; | |
903bb32e | 3168 | ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred); |
36be9a76 AE |
3169 | out: |
3170 | if (obj_request) | |
3171 | rbd_obj_request_put(obj_request); | |
3172 | else | |
3173 | ceph_release_page_vector(pages, page_count); | |
3174 | ||
3175 | return ret; | |
3176 | } | |
3177 | ||
bc1ecc65 | 3178 | static void rbd_handle_request(struct rbd_device *rbd_dev, struct request *rq) |
bf0d5f50 | 3179 | { |
bc1ecc65 | 3180 | struct rbd_img_request *img_request; |
4e752f0a | 3181 | struct ceph_snap_context *snapc = NULL; |
bc1ecc65 ID |
3182 | u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
3183 | u64 length = blk_rq_bytes(rq); | |
3184 | bool wr = rq_data_dir(rq) == WRITE; | |
4e752f0a | 3185 | u64 mapping_size; |
bf0d5f50 AE |
3186 | int result; |
3187 | ||
bc1ecc65 | 3188 | /* Ignore/skip any zero-length requests */ |
bf0d5f50 | 3189 | |
bc1ecc65 ID |
3190 | if (!length) { |
3191 | dout("%s: zero-length request\n", __func__); | |
3192 | result = 0; | |
3193 | goto err_rq; | |
3194 | } | |
bf0d5f50 | 3195 | |
bc1ecc65 ID |
3196 | /* Disallow writes to a read-only device */ |
3197 | ||
3198 | if (wr) { | |
3199 | if (rbd_dev->mapping.read_only) { | |
3200 | result = -EROFS; | |
3201 | goto err_rq; | |
4dda41d3 | 3202 | } |
bc1ecc65 ID |
3203 | rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
3204 | } | |
4dda41d3 | 3205 | |
bc1ecc65 ID |
3206 | /* |
3207 | * Quit early if the mapped snapshot no longer exists. It's | |
3208 | * still possible the snapshot will have disappeared by the | |
3209 | * time our request arrives at the osd, but there's no sense in | |
3210 | * sending it if we already know. | |
3211 | */ | |
3212 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { | |
3213 | dout("request for non-existent snapshot"); | |
3214 | rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); | |
3215 | result = -ENXIO; | |
3216 | goto err_rq; | |
3217 | } | |
4dda41d3 | 3218 | |
bc1ecc65 ID |
3219 | if (offset && length > U64_MAX - offset + 1) { |
3220 | rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, | |
3221 | length); | |
3222 | result = -EINVAL; | |
3223 | goto err_rq; /* Shouldn't happen */ | |
3224 | } | |
4dda41d3 | 3225 | |
4e752f0a JD |
3226 | down_read(&rbd_dev->header_rwsem); |
3227 | mapping_size = rbd_dev->mapping.size; | |
3228 | if (wr) { | |
3229 | snapc = rbd_dev->header.snapc; | |
3230 | ceph_get_snap_context(snapc); | |
3231 | } | |
3232 | up_read(&rbd_dev->header_rwsem); | |
3233 | ||
3234 | if (offset + length > mapping_size) { | |
bc1ecc65 | 3235 | rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
4e752f0a | 3236 | length, mapping_size); |
bc1ecc65 ID |
3237 | result = -EIO; |
3238 | goto err_rq; | |
3239 | } | |
bf0d5f50 | 3240 | |
4e752f0a JD |
3241 | img_request = rbd_img_request_create(rbd_dev, offset, length, wr, |
3242 | snapc); | |
bc1ecc65 ID |
3243 | if (!img_request) { |
3244 | result = -ENOMEM; | |
3245 | goto err_rq; | |
3246 | } | |
3247 | img_request->rq = rq; | |
bf0d5f50 | 3248 | |
bc1ecc65 ID |
3249 | result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, rq->bio); |
3250 | if (result) | |
3251 | goto err_img_request; | |
bf0d5f50 | 3252 | |
bc1ecc65 ID |
3253 | result = rbd_img_request_submit(img_request); |
3254 | if (result) | |
3255 | goto err_img_request; | |
bf0d5f50 | 3256 | |
bc1ecc65 | 3257 | return; |
bf0d5f50 | 3258 | |
bc1ecc65 ID |
3259 | err_img_request: |
3260 | rbd_img_request_put(img_request); | |
3261 | err_rq: | |
3262 | if (result) | |
3263 | rbd_warn(rbd_dev, "%s %llx at %llx result %d", | |
3264 | wr ? "write" : "read", length, offset, result); | |
4e752f0a JD |
3265 | if (snapc) |
3266 | ceph_put_snap_context(snapc); | |
bc1ecc65 ID |
3267 | blk_end_request_all(rq, result); |
3268 | } | |
bf0d5f50 | 3269 | |
bc1ecc65 ID |
3270 | static void rbd_request_workfn(struct work_struct *work) |
3271 | { | |
3272 | struct rbd_device *rbd_dev = | |
3273 | container_of(work, struct rbd_device, rq_work); | |
3274 | struct request *rq, *next; | |
3275 | LIST_HEAD(requests); | |
00a653e2 | 3276 | |
bc1ecc65 ID |
3277 | spin_lock_irq(&rbd_dev->lock); /* rq->q->queue_lock */ |
3278 | list_splice_init(&rbd_dev->rq_queue, &requests); | |
3279 | spin_unlock_irq(&rbd_dev->lock); | |
bf0d5f50 | 3280 | |
bc1ecc65 ID |
3281 | list_for_each_entry_safe(rq, next, &requests, queuelist) { |
3282 | list_del_init(&rq->queuelist); | |
3283 | rbd_handle_request(rbd_dev, rq); | |
3284 | } | |
3285 | } | |
bf0d5f50 | 3286 | |
bc1ecc65 ID |
3287 | /* |
3288 | * Called with q->queue_lock held and interrupts disabled, possibly on | |
3289 | * the way to schedule(). Do not sleep here! | |
3290 | */ | |
3291 | static void rbd_request_fn(struct request_queue *q) | |
3292 | { | |
3293 | struct rbd_device *rbd_dev = q->queuedata; | |
3294 | struct request *rq; | |
3295 | int queued = 0; | |
3296 | ||
3297 | rbd_assert(rbd_dev); | |
3298 | ||
3299 | while ((rq = blk_fetch_request(q))) { | |
3300 | /* Ignore any non-FS requests that filter through. */ | |
3301 | if (rq->cmd_type != REQ_TYPE_FS) { | |
3302 | dout("%s: non-fs request type %d\n", __func__, | |
3303 | (int) rq->cmd_type); | |
3304 | __blk_end_request_all(rq, 0); | |
3305 | continue; | |
bf0d5f50 | 3306 | } |
bc1ecc65 ID |
3307 | |
3308 | list_add_tail(&rq->queuelist, &rbd_dev->rq_queue); | |
3309 | queued++; | |
bf0d5f50 | 3310 | } |
bc1ecc65 ID |
3311 | |
3312 | if (queued) | |
3313 | queue_work(rbd_dev->rq_wq, &rbd_dev->rq_work); | |
bf0d5f50 AE |
3314 | } |
3315 | ||
602adf40 YS |
3316 | /* |
3317 | * a queue callback. Makes sure that we don't create a bio that spans across | |
3318 | * multiple osd objects. One exception would be with a single page bios, | |
f7760dad | 3319 | * which we handle later at bio_chain_clone_range() |
602adf40 YS |
3320 | */ |
3321 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
3322 | struct bio_vec *bvec) | |
3323 | { | |
3324 | struct rbd_device *rbd_dev = q->queuedata; | |
e5cfeed2 AE |
3325 | sector_t sector_offset; |
3326 | sector_t sectors_per_obj; | |
3327 | sector_t obj_sector_offset; | |
3328 | int ret; | |
3329 | ||
3330 | /* | |
3331 | * Find how far into its rbd object the partition-relative | |
3332 | * bio start sector is to offset relative to the enclosing | |
3333 | * device. | |
3334 | */ | |
3335 | sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; | |
3336 | sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); | |
3337 | obj_sector_offset = sector_offset & (sectors_per_obj - 1); | |
3338 | ||
3339 | /* | |
3340 | * Compute the number of bytes from that offset to the end | |
3341 | * of the object. Account for what's already used by the bio. | |
3342 | */ | |
3343 | ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; | |
3344 | if (ret > bmd->bi_size) | |
3345 | ret -= bmd->bi_size; | |
3346 | else | |
3347 | ret = 0; | |
3348 | ||
3349 | /* | |
3350 | * Don't send back more than was asked for. And if the bio | |
3351 | * was empty, let the whole thing through because: "Note | |
3352 | * that a block device *must* allow a single page to be | |
3353 | * added to an empty bio." | |
3354 | */ | |
3355 | rbd_assert(bvec->bv_len <= PAGE_SIZE); | |
3356 | if (ret > (int) bvec->bv_len || !bmd->bi_size) | |
3357 | ret = (int) bvec->bv_len; | |
3358 | ||
3359 | return ret; | |
602adf40 YS |
3360 | } |
3361 | ||
3362 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
3363 | { | |
3364 | struct gendisk *disk = rbd_dev->disk; | |
3365 | ||
3366 | if (!disk) | |
3367 | return; | |
3368 | ||
a0cab924 AE |
3369 | rbd_dev->disk = NULL; |
3370 | if (disk->flags & GENHD_FL_UP) { | |
602adf40 | 3371 | del_gendisk(disk); |
a0cab924 AE |
3372 | if (disk->queue) |
3373 | blk_cleanup_queue(disk->queue); | |
3374 | } | |
602adf40 YS |
3375 | put_disk(disk); |
3376 | } | |
3377 | ||
788e2df3 AE |
3378 | static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
3379 | const char *object_name, | |
7097f8df | 3380 | u64 offset, u64 length, void *buf) |
788e2df3 AE |
3381 | |
3382 | { | |
2169238d | 3383 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
788e2df3 | 3384 | struct rbd_obj_request *obj_request; |
788e2df3 AE |
3385 | struct page **pages = NULL; |
3386 | u32 page_count; | |
1ceae7ef | 3387 | size_t size; |
788e2df3 AE |
3388 | int ret; |
3389 | ||
3390 | page_count = (u32) calc_pages_for(offset, length); | |
3391 | pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); | |
3392 | if (IS_ERR(pages)) | |
3393 | ret = PTR_ERR(pages); | |
3394 | ||
3395 | ret = -ENOMEM; | |
3396 | obj_request = rbd_obj_request_create(object_name, offset, length, | |
36be9a76 | 3397 | OBJ_REQUEST_PAGES); |
788e2df3 AE |
3398 | if (!obj_request) |
3399 | goto out; | |
3400 | ||
3401 | obj_request->pages = pages; | |
3402 | obj_request->page_count = page_count; | |
3403 | ||
deb236b3 ID |
3404 | obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, 1, |
3405 | obj_request); | |
788e2df3 AE |
3406 | if (!obj_request->osd_req) |
3407 | goto out; | |
3408 | ||
c99d2d4a AE |
3409 | osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ, |
3410 | offset, length, 0, 0); | |
406e2c9f | 3411 | osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0, |
a4ce40a9 | 3412 | obj_request->pages, |
44cd188d AE |
3413 | obj_request->length, |
3414 | obj_request->offset & ~PAGE_MASK, | |
3415 | false, false); | |
9d4df01f | 3416 | rbd_osd_req_format_read(obj_request); |
430c28c3 | 3417 | |
788e2df3 AE |
3418 | ret = rbd_obj_request_submit(osdc, obj_request); |
3419 | if (ret) | |
3420 | goto out; | |
3421 | ret = rbd_obj_request_wait(obj_request); | |
3422 | if (ret) | |
3423 | goto out; | |
3424 | ||
3425 | ret = obj_request->result; | |
3426 | if (ret < 0) | |
3427 | goto out; | |
1ceae7ef AE |
3428 | |
3429 | rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); | |
3430 | size = (size_t) obj_request->xferred; | |
903bb32e | 3431 | ceph_copy_from_page_vector(pages, buf, 0, size); |
7097f8df AE |
3432 | rbd_assert(size <= (size_t)INT_MAX); |
3433 | ret = (int)size; | |
788e2df3 AE |
3434 | out: |
3435 | if (obj_request) | |
3436 | rbd_obj_request_put(obj_request); | |
3437 | else | |
3438 | ceph_release_page_vector(pages, page_count); | |
3439 | ||
3440 | return ret; | |
3441 | } | |
3442 | ||
602adf40 | 3443 | /* |
662518b1 AE |
3444 | * Read the complete header for the given rbd device. On successful |
3445 | * return, the rbd_dev->header field will contain up-to-date | |
3446 | * information about the image. | |
602adf40 | 3447 | */ |
99a41ebc | 3448 | static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
602adf40 | 3449 | { |
4156d998 | 3450 | struct rbd_image_header_ondisk *ondisk = NULL; |
50f7c4c9 | 3451 | u32 snap_count = 0; |
4156d998 AE |
3452 | u64 names_size = 0; |
3453 | u32 want_count; | |
3454 | int ret; | |
602adf40 | 3455 | |
00f1f36f | 3456 | /* |
4156d998 AE |
3457 | * The complete header will include an array of its 64-bit |
3458 | * snapshot ids, followed by the names of those snapshots as | |
3459 | * a contiguous block of NUL-terminated strings. Note that | |
3460 | * the number of snapshots could change by the time we read | |
3461 | * it in, in which case we re-read it. | |
00f1f36f | 3462 | */ |
4156d998 AE |
3463 | do { |
3464 | size_t size; | |
3465 | ||
3466 | kfree(ondisk); | |
3467 | ||
3468 | size = sizeof (*ondisk); | |
3469 | size += snap_count * sizeof (struct rbd_image_snap_ondisk); | |
3470 | size += names_size; | |
3471 | ondisk = kmalloc(size, GFP_KERNEL); | |
3472 | if (!ondisk) | |
662518b1 | 3473 | return -ENOMEM; |
4156d998 | 3474 | |
788e2df3 | 3475 | ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
7097f8df | 3476 | 0, size, ondisk); |
4156d998 | 3477 | if (ret < 0) |
662518b1 | 3478 | goto out; |
c0cd10db | 3479 | if ((size_t)ret < size) { |
4156d998 | 3480 | ret = -ENXIO; |
06ecc6cb AE |
3481 | rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
3482 | size, ret); | |
662518b1 | 3483 | goto out; |
4156d998 AE |
3484 | } |
3485 | if (!rbd_dev_ondisk_valid(ondisk)) { | |
3486 | ret = -ENXIO; | |
06ecc6cb | 3487 | rbd_warn(rbd_dev, "invalid header"); |
662518b1 | 3488 | goto out; |
81e759fb | 3489 | } |
602adf40 | 3490 | |
4156d998 AE |
3491 | names_size = le64_to_cpu(ondisk->snap_names_len); |
3492 | want_count = snap_count; | |
3493 | snap_count = le32_to_cpu(ondisk->snap_count); | |
3494 | } while (snap_count != want_count); | |
00f1f36f | 3495 | |
662518b1 AE |
3496 | ret = rbd_header_from_disk(rbd_dev, ondisk); |
3497 | out: | |
4156d998 AE |
3498 | kfree(ondisk); |
3499 | ||
3500 | return ret; | |
602adf40 YS |
3501 | } |
3502 | ||
15228ede AE |
3503 | /* |
3504 | * Clear the rbd device's EXISTS flag if the snapshot it's mapped to | |
3505 | * has disappeared from the (just updated) snapshot context. | |
3506 | */ | |
3507 | static void rbd_exists_validate(struct rbd_device *rbd_dev) | |
3508 | { | |
3509 | u64 snap_id; | |
3510 | ||
3511 | if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) | |
3512 | return; | |
3513 | ||
3514 | snap_id = rbd_dev->spec->snap_id; | |
3515 | if (snap_id == CEPH_NOSNAP) | |
3516 | return; | |
3517 | ||
3518 | if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) | |
3519 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); | |
3520 | } | |
3521 | ||
9875201e JD |
3522 | static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
3523 | { | |
3524 | sector_t size; | |
3525 | bool removing; | |
3526 | ||
3527 | /* | |
3528 | * Don't hold the lock while doing disk operations, | |
3529 | * or lock ordering will conflict with the bdev mutex via: | |
3530 | * rbd_add() -> blkdev_get() -> rbd_open() | |
3531 | */ | |
3532 | spin_lock_irq(&rbd_dev->lock); | |
3533 | removing = test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); | |
3534 | spin_unlock_irq(&rbd_dev->lock); | |
3535 | /* | |
3536 | * If the device is being removed, rbd_dev->disk has | |
3537 | * been destroyed, so don't try to update its size | |
3538 | */ | |
3539 | if (!removing) { | |
3540 | size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; | |
3541 | dout("setting size to %llu sectors", (unsigned long long)size); | |
3542 | set_capacity(rbd_dev->disk, size); | |
3543 | revalidate_disk(rbd_dev->disk); | |
3544 | } | |
3545 | } | |
3546 | ||
cc4a38bd | 3547 | static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
1fe5e993 | 3548 | { |
e627db08 | 3549 | u64 mapping_size; |
1fe5e993 AE |
3550 | int ret; |
3551 | ||
cfbf6377 | 3552 | down_write(&rbd_dev->header_rwsem); |
3b5cf2a2 | 3553 | mapping_size = rbd_dev->mapping.size; |
a720ae09 ID |
3554 | |
3555 | ret = rbd_dev_header_info(rbd_dev); | |
52bb1f9b ID |
3556 | if (ret) |
3557 | return ret; | |
15228ede | 3558 | |
e8f59b59 ID |
3559 | /* |
3560 | * If there is a parent, see if it has disappeared due to the | |
3561 | * mapped image getting flattened. | |
3562 | */ | |
3563 | if (rbd_dev->parent) { | |
3564 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
3565 | if (ret) | |
3566 | return ret; | |
3567 | } | |
3568 | ||
5ff1108c ID |
3569 | if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
3570 | if (rbd_dev->mapping.size != rbd_dev->header.image_size) | |
3571 | rbd_dev->mapping.size = rbd_dev->header.image_size; | |
3572 | } else { | |
3573 | /* validate mapped snapshot's EXISTS flag */ | |
3574 | rbd_exists_validate(rbd_dev); | |
3575 | } | |
15228ede | 3576 | |
cfbf6377 AE |
3577 | up_write(&rbd_dev->header_rwsem); |
3578 | ||
e8f59b59 | 3579 | if (mapping_size != rbd_dev->mapping.size) |
9875201e | 3580 | rbd_dev_update_size(rbd_dev); |
1fe5e993 | 3581 | |
52bb1f9b | 3582 | return 0; |
1fe5e993 AE |
3583 | } |
3584 | ||
602adf40 YS |
3585 | static int rbd_init_disk(struct rbd_device *rbd_dev) |
3586 | { | |
3587 | struct gendisk *disk; | |
3588 | struct request_queue *q; | |
593a9e7b | 3589 | u64 segment_size; |
602adf40 | 3590 | |
602adf40 | 3591 | /* create gendisk info */ |
7e513d43 ID |
3592 | disk = alloc_disk(single_major ? |
3593 | (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : | |
3594 | RBD_MINORS_PER_MAJOR); | |
602adf40 | 3595 | if (!disk) |
1fcdb8aa | 3596 | return -ENOMEM; |
602adf40 | 3597 | |
f0f8cef5 | 3598 | snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
de71a297 | 3599 | rbd_dev->dev_id); |
602adf40 | 3600 | disk->major = rbd_dev->major; |
dd82fff1 | 3601 | disk->first_minor = rbd_dev->minor; |
7e513d43 ID |
3602 | if (single_major) |
3603 | disk->flags |= GENHD_FL_EXT_DEVT; | |
602adf40 YS |
3604 | disk->fops = &rbd_bd_ops; |
3605 | disk->private_data = rbd_dev; | |
3606 | ||
bf0d5f50 | 3607 | q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
602adf40 YS |
3608 | if (!q) |
3609 | goto out_disk; | |
029bcbd8 | 3610 | |
593a9e7b AE |
3611 | /* We use the default size, but let's be explicit about it. */ |
3612 | blk_queue_physical_block_size(q, SECTOR_SIZE); | |
3613 | ||
029bcbd8 | 3614 | /* set io sizes to object size */ |
593a9e7b AE |
3615 | segment_size = rbd_obj_bytes(&rbd_dev->header); |
3616 | blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); | |
3617 | blk_queue_max_segment_size(q, segment_size); | |
3618 | blk_queue_io_min(q, segment_size); | |
3619 | blk_queue_io_opt(q, segment_size); | |
029bcbd8 | 3620 | |
602adf40 YS |
3621 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
3622 | disk->queue = q; | |
3623 | ||
3624 | q->queuedata = rbd_dev; | |
3625 | ||
3626 | rbd_dev->disk = disk; | |
602adf40 | 3627 | |
602adf40 | 3628 | return 0; |
602adf40 YS |
3629 | out_disk: |
3630 | put_disk(disk); | |
1fcdb8aa AE |
3631 | |
3632 | return -ENOMEM; | |
602adf40 YS |
3633 | } |
3634 | ||
dfc5606d YS |
3635 | /* |
3636 | sysfs | |
3637 | */ | |
3638 | ||
593a9e7b AE |
3639 | static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
3640 | { | |
3641 | return container_of(dev, struct rbd_device, dev); | |
3642 | } | |
3643 | ||
dfc5606d YS |
3644 | static ssize_t rbd_size_show(struct device *dev, |
3645 | struct device_attribute *attr, char *buf) | |
3646 | { | |
593a9e7b | 3647 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
a51aa0c0 | 3648 | |
fc71d833 AE |
3649 | return sprintf(buf, "%llu\n", |
3650 | (unsigned long long)rbd_dev->mapping.size); | |
dfc5606d YS |
3651 | } |
3652 | ||
34b13184 AE |
3653 | /* |
3654 | * Note this shows the features for whatever's mapped, which is not | |
3655 | * necessarily the base image. | |
3656 | */ | |
3657 | static ssize_t rbd_features_show(struct device *dev, | |
3658 | struct device_attribute *attr, char *buf) | |
3659 | { | |
3660 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3661 | ||
3662 | return sprintf(buf, "0x%016llx\n", | |
fc71d833 | 3663 | (unsigned long long)rbd_dev->mapping.features); |
34b13184 AE |
3664 | } |
3665 | ||
dfc5606d YS |
3666 | static ssize_t rbd_major_show(struct device *dev, |
3667 | struct device_attribute *attr, char *buf) | |
3668 | { | |
593a9e7b | 3669 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 3670 | |
fc71d833 AE |
3671 | if (rbd_dev->major) |
3672 | return sprintf(buf, "%d\n", rbd_dev->major); | |
3673 | ||
3674 | return sprintf(buf, "(none)\n"); | |
dd82fff1 ID |
3675 | } |
3676 | ||
3677 | static ssize_t rbd_minor_show(struct device *dev, | |
3678 | struct device_attribute *attr, char *buf) | |
3679 | { | |
3680 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
fc71d833 | 3681 | |
dd82fff1 | 3682 | return sprintf(buf, "%d\n", rbd_dev->minor); |
dfc5606d YS |
3683 | } |
3684 | ||
3685 | static ssize_t rbd_client_id_show(struct device *dev, | |
3686 | struct device_attribute *attr, char *buf) | |
602adf40 | 3687 | { |
593a9e7b | 3688 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3689 | |
1dbb4399 AE |
3690 | return sprintf(buf, "client%lld\n", |
3691 | ceph_client_id(rbd_dev->rbd_client->client)); | |
602adf40 YS |
3692 | } |
3693 | ||
dfc5606d YS |
3694 | static ssize_t rbd_pool_show(struct device *dev, |
3695 | struct device_attribute *attr, char *buf) | |
602adf40 | 3696 | { |
593a9e7b | 3697 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3698 | |
0d7dbfce | 3699 | return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
dfc5606d YS |
3700 | } |
3701 | ||
9bb2f334 AE |
3702 | static ssize_t rbd_pool_id_show(struct device *dev, |
3703 | struct device_attribute *attr, char *buf) | |
3704 | { | |
3705 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3706 | ||
0d7dbfce | 3707 | return sprintf(buf, "%llu\n", |
fc71d833 | 3708 | (unsigned long long) rbd_dev->spec->pool_id); |
9bb2f334 AE |
3709 | } |
3710 | ||
dfc5606d YS |
3711 | static ssize_t rbd_name_show(struct device *dev, |
3712 | struct device_attribute *attr, char *buf) | |
3713 | { | |
593a9e7b | 3714 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3715 | |
a92ffdf8 AE |
3716 | if (rbd_dev->spec->image_name) |
3717 | return sprintf(buf, "%s\n", rbd_dev->spec->image_name); | |
3718 | ||
3719 | return sprintf(buf, "(unknown)\n"); | |
dfc5606d YS |
3720 | } |
3721 | ||
589d30e0 AE |
3722 | static ssize_t rbd_image_id_show(struct device *dev, |
3723 | struct device_attribute *attr, char *buf) | |
3724 | { | |
3725 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
3726 | ||
0d7dbfce | 3727 | return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
589d30e0 AE |
3728 | } |
3729 | ||
34b13184 AE |
3730 | /* |
3731 | * Shows the name of the currently-mapped snapshot (or | |
3732 | * RBD_SNAP_HEAD_NAME for the base image). | |
3733 | */ | |
dfc5606d YS |
3734 | static ssize_t rbd_snap_show(struct device *dev, |
3735 | struct device_attribute *attr, | |
3736 | char *buf) | |
3737 | { | |
593a9e7b | 3738 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
dfc5606d | 3739 | |
0d7dbfce | 3740 | return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
dfc5606d YS |
3741 | } |
3742 | ||
86b00e0d | 3743 | /* |
ff96128f ID |
3744 | * For a v2 image, shows the chain of parent images, separated by empty |
3745 | * lines. For v1 images or if there is no parent, shows "(no parent | |
3746 | * image)". | |
86b00e0d AE |
3747 | */ |
3748 | static ssize_t rbd_parent_show(struct device *dev, | |
ff96128f ID |
3749 | struct device_attribute *attr, |
3750 | char *buf) | |
86b00e0d AE |
3751 | { |
3752 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); | |
ff96128f | 3753 | ssize_t count = 0; |
86b00e0d | 3754 | |
ff96128f | 3755 | if (!rbd_dev->parent) |
86b00e0d AE |
3756 | return sprintf(buf, "(no parent image)\n"); |
3757 | ||
ff96128f ID |
3758 | for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
3759 | struct rbd_spec *spec = rbd_dev->parent_spec; | |
3760 | ||
3761 | count += sprintf(&buf[count], "%s" | |
3762 | "pool_id %llu\npool_name %s\n" | |
3763 | "image_id %s\nimage_name %s\n" | |
3764 | "snap_id %llu\nsnap_name %s\n" | |
3765 | "overlap %llu\n", | |
3766 | !count ? "" : "\n", /* first? */ | |
3767 | spec->pool_id, spec->pool_name, | |
3768 | spec->image_id, spec->image_name ?: "(unknown)", | |
3769 | spec->snap_id, spec->snap_name, | |
3770 | rbd_dev->parent_overlap); | |
3771 | } | |
3772 | ||
3773 | return count; | |
86b00e0d AE |
3774 | } |
3775 | ||
dfc5606d YS |
3776 | static ssize_t rbd_image_refresh(struct device *dev, |
3777 | struct device_attribute *attr, | |
3778 | const char *buf, | |
3779 | size_t size) | |
3780 | { | |
593a9e7b | 3781 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
b813623a | 3782 | int ret; |
602adf40 | 3783 | |
cc4a38bd | 3784 | ret = rbd_dev_refresh(rbd_dev); |
e627db08 | 3785 | if (ret) |
52bb1f9b | 3786 | return ret; |
b813623a | 3787 | |
52bb1f9b | 3788 | return size; |
dfc5606d | 3789 | } |
602adf40 | 3790 | |
dfc5606d | 3791 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
34b13184 | 3792 | static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
dfc5606d | 3793 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
dd82fff1 | 3794 | static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
dfc5606d YS |
3795 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
3796 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
9bb2f334 | 3797 | static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
dfc5606d | 3798 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
589d30e0 | 3799 | static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
dfc5606d YS |
3800 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
3801 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
86b00e0d | 3802 | static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
dfc5606d YS |
3803 | |
3804 | static struct attribute *rbd_attrs[] = { | |
3805 | &dev_attr_size.attr, | |
34b13184 | 3806 | &dev_attr_features.attr, |
dfc5606d | 3807 | &dev_attr_major.attr, |
dd82fff1 | 3808 | &dev_attr_minor.attr, |
dfc5606d YS |
3809 | &dev_attr_client_id.attr, |
3810 | &dev_attr_pool.attr, | |
9bb2f334 | 3811 | &dev_attr_pool_id.attr, |
dfc5606d | 3812 | &dev_attr_name.attr, |
589d30e0 | 3813 | &dev_attr_image_id.attr, |
dfc5606d | 3814 | &dev_attr_current_snap.attr, |
86b00e0d | 3815 | &dev_attr_parent.attr, |
dfc5606d | 3816 | &dev_attr_refresh.attr, |
dfc5606d YS |
3817 | NULL |
3818 | }; | |
3819 | ||
3820 | static struct attribute_group rbd_attr_group = { | |
3821 | .attrs = rbd_attrs, | |
3822 | }; | |
3823 | ||
3824 | static const struct attribute_group *rbd_attr_groups[] = { | |
3825 | &rbd_attr_group, | |
3826 | NULL | |
3827 | }; | |
3828 | ||
3829 | static void rbd_sysfs_dev_release(struct device *dev) | |
3830 | { | |
3831 | } | |
3832 | ||
3833 | static struct device_type rbd_device_type = { | |
3834 | .name = "rbd", | |
3835 | .groups = rbd_attr_groups, | |
3836 | .release = rbd_sysfs_dev_release, | |
3837 | }; | |
3838 | ||
8b8fb99c AE |
3839 | static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
3840 | { | |
3841 | kref_get(&spec->kref); | |
3842 | ||
3843 | return spec; | |
3844 | } | |
3845 | ||
3846 | static void rbd_spec_free(struct kref *kref); | |
3847 | static void rbd_spec_put(struct rbd_spec *spec) | |
3848 | { | |
3849 | if (spec) | |
3850 | kref_put(&spec->kref, rbd_spec_free); | |
3851 | } | |
3852 | ||
3853 | static struct rbd_spec *rbd_spec_alloc(void) | |
3854 | { | |
3855 | struct rbd_spec *spec; | |
3856 | ||
3857 | spec = kzalloc(sizeof (*spec), GFP_KERNEL); | |
3858 | if (!spec) | |
3859 | return NULL; | |
04077599 ID |
3860 | |
3861 | spec->pool_id = CEPH_NOPOOL; | |
3862 | spec->snap_id = CEPH_NOSNAP; | |
8b8fb99c AE |
3863 | kref_init(&spec->kref); |
3864 | ||
8b8fb99c AE |
3865 | return spec; |
3866 | } | |
3867 | ||
3868 | static void rbd_spec_free(struct kref *kref) | |
3869 | { | |
3870 | struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); | |
3871 | ||
3872 | kfree(spec->pool_name); | |
3873 | kfree(spec->image_id); | |
3874 | kfree(spec->image_name); | |
3875 | kfree(spec->snap_name); | |
3876 | kfree(spec); | |
3877 | } | |
3878 | ||
cc344fa1 | 3879 | static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
c53d5893 AE |
3880 | struct rbd_spec *spec) |
3881 | { | |
3882 | struct rbd_device *rbd_dev; | |
3883 | ||
3884 | rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); | |
3885 | if (!rbd_dev) | |
3886 | return NULL; | |
3887 | ||
3888 | spin_lock_init(&rbd_dev->lock); | |
bc1ecc65 ID |
3889 | INIT_LIST_HEAD(&rbd_dev->rq_queue); |
3890 | INIT_WORK(&rbd_dev->rq_work, rbd_request_workfn); | |
6d292906 | 3891 | rbd_dev->flags = 0; |
a2acd00e | 3892 | atomic_set(&rbd_dev->parent_ref, 0); |
c53d5893 | 3893 | INIT_LIST_HEAD(&rbd_dev->node); |
c53d5893 AE |
3894 | init_rwsem(&rbd_dev->header_rwsem); |
3895 | ||
3896 | rbd_dev->spec = spec; | |
3897 | rbd_dev->rbd_client = rbdc; | |
3898 | ||
0903e875 AE |
3899 | /* Initialize the layout used for all rbd requests */ |
3900 | ||
3901 | rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3902 | rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); | |
3903 | rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
3904 | rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); | |
3905 | ||
c53d5893 AE |
3906 | return rbd_dev; |
3907 | } | |
3908 | ||
3909 | static void rbd_dev_destroy(struct rbd_device *rbd_dev) | |
3910 | { | |
c53d5893 AE |
3911 | rbd_put_client(rbd_dev->rbd_client); |
3912 | rbd_spec_put(rbd_dev->spec); | |
3913 | kfree(rbd_dev); | |
3914 | } | |
3915 | ||
9d475de5 AE |
3916 | /* |
3917 | * Get the size and object order for an image snapshot, or if | |
3918 | * snap_id is CEPH_NOSNAP, gets this information for the base | |
3919 | * image. | |
3920 | */ | |
3921 | static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, | |
3922 | u8 *order, u64 *snap_size) | |
3923 | { | |
3924 | __le64 snapid = cpu_to_le64(snap_id); | |
3925 | int ret; | |
3926 | struct { | |
3927 | u8 order; | |
3928 | __le64 size; | |
3929 | } __attribute__ ((packed)) size_buf = { 0 }; | |
3930 | ||
36be9a76 | 3931 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
9d475de5 | 3932 | "rbd", "get_size", |
4157976b | 3933 | &snapid, sizeof (snapid), |
e2a58ee5 | 3934 | &size_buf, sizeof (size_buf)); |
36be9a76 | 3935 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
9d475de5 AE |
3936 | if (ret < 0) |
3937 | return ret; | |
57385b51 AE |
3938 | if (ret < sizeof (size_buf)) |
3939 | return -ERANGE; | |
9d475de5 | 3940 | |
c3545579 | 3941 | if (order) { |
c86f86e9 | 3942 | *order = size_buf.order; |
c3545579 JD |
3943 | dout(" order %u", (unsigned int)*order); |
3944 | } | |
9d475de5 AE |
3945 | *snap_size = le64_to_cpu(size_buf.size); |
3946 | ||
c3545579 JD |
3947 | dout(" snap_id 0x%016llx snap_size = %llu\n", |
3948 | (unsigned long long)snap_id, | |
57385b51 | 3949 | (unsigned long long)*snap_size); |
9d475de5 AE |
3950 | |
3951 | return 0; | |
3952 | } | |
3953 | ||
3954 | static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) | |
3955 | { | |
3956 | return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, | |
3957 | &rbd_dev->header.obj_order, | |
3958 | &rbd_dev->header.image_size); | |
3959 | } | |
3960 | ||
1e130199 AE |
3961 | static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
3962 | { | |
3963 | void *reply_buf; | |
3964 | int ret; | |
3965 | void *p; | |
3966 | ||
3967 | reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); | |
3968 | if (!reply_buf) | |
3969 | return -ENOMEM; | |
3970 | ||
36be9a76 | 3971 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 3972 | "rbd", "get_object_prefix", NULL, 0, |
e2a58ee5 | 3973 | reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
36be9a76 | 3974 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
1e130199 AE |
3975 | if (ret < 0) |
3976 | goto out; | |
3977 | ||
3978 | p = reply_buf; | |
3979 | rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, | |
57385b51 AE |
3980 | p + ret, NULL, GFP_NOIO); |
3981 | ret = 0; | |
1e130199 AE |
3982 | |
3983 | if (IS_ERR(rbd_dev->header.object_prefix)) { | |
3984 | ret = PTR_ERR(rbd_dev->header.object_prefix); | |
3985 | rbd_dev->header.object_prefix = NULL; | |
3986 | } else { | |
3987 | dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); | |
3988 | } | |
1e130199 AE |
3989 | out: |
3990 | kfree(reply_buf); | |
3991 | ||
3992 | return ret; | |
3993 | } | |
3994 | ||
b1b5402a AE |
3995 | static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
3996 | u64 *snap_features) | |
3997 | { | |
3998 | __le64 snapid = cpu_to_le64(snap_id); | |
3999 | struct { | |
4000 | __le64 features; | |
4001 | __le64 incompat; | |
4157976b | 4002 | } __attribute__ ((packed)) features_buf = { 0 }; |
d889140c | 4003 | u64 incompat; |
b1b5402a AE |
4004 | int ret; |
4005 | ||
36be9a76 | 4006 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b1b5402a | 4007 | "rbd", "get_features", |
4157976b | 4008 | &snapid, sizeof (snapid), |
e2a58ee5 | 4009 | &features_buf, sizeof (features_buf)); |
36be9a76 | 4010 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
b1b5402a AE |
4011 | if (ret < 0) |
4012 | return ret; | |
57385b51 AE |
4013 | if (ret < sizeof (features_buf)) |
4014 | return -ERANGE; | |
d889140c AE |
4015 | |
4016 | incompat = le64_to_cpu(features_buf.incompat); | |
5cbf6f12 | 4017 | if (incompat & ~RBD_FEATURES_SUPPORTED) |
b8f5c6ed | 4018 | return -ENXIO; |
d889140c | 4019 | |
b1b5402a AE |
4020 | *snap_features = le64_to_cpu(features_buf.features); |
4021 | ||
4022 | dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", | |
57385b51 AE |
4023 | (unsigned long long)snap_id, |
4024 | (unsigned long long)*snap_features, | |
4025 | (unsigned long long)le64_to_cpu(features_buf.incompat)); | |
b1b5402a AE |
4026 | |
4027 | return 0; | |
4028 | } | |
4029 | ||
4030 | static int rbd_dev_v2_features(struct rbd_device *rbd_dev) | |
4031 | { | |
4032 | return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, | |
4033 | &rbd_dev->header.features); | |
4034 | } | |
4035 | ||
86b00e0d AE |
4036 | static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
4037 | { | |
4038 | struct rbd_spec *parent_spec; | |
4039 | size_t size; | |
4040 | void *reply_buf = NULL; | |
4041 | __le64 snapid; | |
4042 | void *p; | |
4043 | void *end; | |
642a2537 | 4044 | u64 pool_id; |
86b00e0d | 4045 | char *image_id; |
3b5cf2a2 | 4046 | u64 snap_id; |
86b00e0d | 4047 | u64 overlap; |
86b00e0d AE |
4048 | int ret; |
4049 | ||
4050 | parent_spec = rbd_spec_alloc(); | |
4051 | if (!parent_spec) | |
4052 | return -ENOMEM; | |
4053 | ||
4054 | size = sizeof (__le64) + /* pool_id */ | |
4055 | sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ | |
4056 | sizeof (__le64) + /* snap_id */ | |
4057 | sizeof (__le64); /* overlap */ | |
4058 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4059 | if (!reply_buf) { | |
4060 | ret = -ENOMEM; | |
4061 | goto out_err; | |
4062 | } | |
4063 | ||
4d9b67cd | 4064 | snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
36be9a76 | 4065 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
86b00e0d | 4066 | "rbd", "get_parent", |
4157976b | 4067 | &snapid, sizeof (snapid), |
e2a58ee5 | 4068 | reply_buf, size); |
36be9a76 | 4069 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
86b00e0d AE |
4070 | if (ret < 0) |
4071 | goto out_err; | |
4072 | ||
86b00e0d | 4073 | p = reply_buf; |
57385b51 AE |
4074 | end = reply_buf + ret; |
4075 | ret = -ERANGE; | |
642a2537 | 4076 | ceph_decode_64_safe(&p, end, pool_id, out_err); |
392a9dad AE |
4077 | if (pool_id == CEPH_NOPOOL) { |
4078 | /* | |
4079 | * Either the parent never existed, or we have | |
4080 | * record of it but the image got flattened so it no | |
4081 | * longer has a parent. When the parent of a | |
4082 | * layered image disappears we immediately set the | |
4083 | * overlap to 0. The effect of this is that all new | |
4084 | * requests will be treated as if the image had no | |
4085 | * parent. | |
4086 | */ | |
4087 | if (rbd_dev->parent_overlap) { | |
4088 | rbd_dev->parent_overlap = 0; | |
4089 | smp_mb(); | |
4090 | rbd_dev_parent_put(rbd_dev); | |
4091 | pr_info("%s: clone image has been flattened\n", | |
4092 | rbd_dev->disk->disk_name); | |
4093 | } | |
4094 | ||
86b00e0d | 4095 | goto out; /* No parent? No problem. */ |
392a9dad | 4096 | } |
86b00e0d | 4097 | |
0903e875 AE |
4098 | /* The ceph file layout needs to fit pool id in 32 bits */ |
4099 | ||
4100 | ret = -EIO; | |
642a2537 | 4101 | if (pool_id > (u64)U32_MAX) { |
9584d508 | 4102 | rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
642a2537 | 4103 | (unsigned long long)pool_id, U32_MAX); |
57385b51 | 4104 | goto out_err; |
c0cd10db | 4105 | } |
0903e875 | 4106 | |
979ed480 | 4107 | image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
86b00e0d AE |
4108 | if (IS_ERR(image_id)) { |
4109 | ret = PTR_ERR(image_id); | |
4110 | goto out_err; | |
4111 | } | |
3b5cf2a2 | 4112 | ceph_decode_64_safe(&p, end, snap_id, out_err); |
86b00e0d AE |
4113 | ceph_decode_64_safe(&p, end, overlap, out_err); |
4114 | ||
3b5cf2a2 AE |
4115 | /* |
4116 | * The parent won't change (except when the clone is | |
4117 | * flattened, already handled that). So we only need to | |
4118 | * record the parent spec we have not already done so. | |
4119 | */ | |
4120 | if (!rbd_dev->parent_spec) { | |
4121 | parent_spec->pool_id = pool_id; | |
4122 | parent_spec->image_id = image_id; | |
4123 | parent_spec->snap_id = snap_id; | |
70cf49cf AE |
4124 | rbd_dev->parent_spec = parent_spec; |
4125 | parent_spec = NULL; /* rbd_dev now owns this */ | |
fbba11b3 ID |
4126 | } else { |
4127 | kfree(image_id); | |
3b5cf2a2 AE |
4128 | } |
4129 | ||
4130 | /* | |
4131 | * We always update the parent overlap. If it's zero we | |
4132 | * treat it specially. | |
4133 | */ | |
4134 | rbd_dev->parent_overlap = overlap; | |
4135 | smp_mb(); | |
4136 | if (!overlap) { | |
4137 | ||
4138 | /* A null parent_spec indicates it's the initial probe */ | |
4139 | ||
4140 | if (parent_spec) { | |
4141 | /* | |
4142 | * The overlap has become zero, so the clone | |
4143 | * must have been resized down to 0 at some | |
4144 | * point. Treat this the same as a flatten. | |
4145 | */ | |
4146 | rbd_dev_parent_put(rbd_dev); | |
4147 | pr_info("%s: clone image now standalone\n", | |
4148 | rbd_dev->disk->disk_name); | |
4149 | } else { | |
4150 | /* | |
4151 | * For the initial probe, if we find the | |
4152 | * overlap is zero we just pretend there was | |
4153 | * no parent image. | |
4154 | */ | |
9584d508 | 4155 | rbd_warn(rbd_dev, "ignoring parent with overlap 0"); |
3b5cf2a2 | 4156 | } |
70cf49cf | 4157 | } |
86b00e0d AE |
4158 | out: |
4159 | ret = 0; | |
4160 | out_err: | |
4161 | kfree(reply_buf); | |
4162 | rbd_spec_put(parent_spec); | |
4163 | ||
4164 | return ret; | |
4165 | } | |
4166 | ||
cc070d59 AE |
4167 | static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
4168 | { | |
4169 | struct { | |
4170 | __le64 stripe_unit; | |
4171 | __le64 stripe_count; | |
4172 | } __attribute__ ((packed)) striping_info_buf = { 0 }; | |
4173 | size_t size = sizeof (striping_info_buf); | |
4174 | void *p; | |
4175 | u64 obj_size; | |
4176 | u64 stripe_unit; | |
4177 | u64 stripe_count; | |
4178 | int ret; | |
4179 | ||
4180 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, | |
4181 | "rbd", "get_stripe_unit_count", NULL, 0, | |
e2a58ee5 | 4182 | (char *)&striping_info_buf, size); |
cc070d59 AE |
4183 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
4184 | if (ret < 0) | |
4185 | return ret; | |
4186 | if (ret < size) | |
4187 | return -ERANGE; | |
4188 | ||
4189 | /* | |
4190 | * We don't actually support the "fancy striping" feature | |
4191 | * (STRIPINGV2) yet, but if the striping sizes are the | |
4192 | * defaults the behavior is the same as before. So find | |
4193 | * out, and only fail if the image has non-default values. | |
4194 | */ | |
4195 | ret = -EINVAL; | |
4196 | obj_size = (u64)1 << rbd_dev->header.obj_order; | |
4197 | p = &striping_info_buf; | |
4198 | stripe_unit = ceph_decode_64(&p); | |
4199 | if (stripe_unit != obj_size) { | |
4200 | rbd_warn(rbd_dev, "unsupported stripe unit " | |
4201 | "(got %llu want %llu)", | |
4202 | stripe_unit, obj_size); | |
4203 | return -EINVAL; | |
4204 | } | |
4205 | stripe_count = ceph_decode_64(&p); | |
4206 | if (stripe_count != 1) { | |
4207 | rbd_warn(rbd_dev, "unsupported stripe count " | |
4208 | "(got %llu want 1)", stripe_count); | |
4209 | return -EINVAL; | |
4210 | } | |
500d0c0f AE |
4211 | rbd_dev->header.stripe_unit = stripe_unit; |
4212 | rbd_dev->header.stripe_count = stripe_count; | |
cc070d59 AE |
4213 | |
4214 | return 0; | |
4215 | } | |
4216 | ||
9e15b77d AE |
4217 | static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
4218 | { | |
4219 | size_t image_id_size; | |
4220 | char *image_id; | |
4221 | void *p; | |
4222 | void *end; | |
4223 | size_t size; | |
4224 | void *reply_buf = NULL; | |
4225 | size_t len = 0; | |
4226 | char *image_name = NULL; | |
4227 | int ret; | |
4228 | ||
4229 | rbd_assert(!rbd_dev->spec->image_name); | |
4230 | ||
69e7a02f AE |
4231 | len = strlen(rbd_dev->spec->image_id); |
4232 | image_id_size = sizeof (__le32) + len; | |
9e15b77d AE |
4233 | image_id = kmalloc(image_id_size, GFP_KERNEL); |
4234 | if (!image_id) | |
4235 | return NULL; | |
4236 | ||
4237 | p = image_id; | |
4157976b | 4238 | end = image_id + image_id_size; |
57385b51 | 4239 | ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
9e15b77d AE |
4240 | |
4241 | size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; | |
4242 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4243 | if (!reply_buf) | |
4244 | goto out; | |
4245 | ||
36be9a76 | 4246 | ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
9e15b77d AE |
4247 | "rbd", "dir_get_name", |
4248 | image_id, image_id_size, | |
e2a58ee5 | 4249 | reply_buf, size); |
9e15b77d AE |
4250 | if (ret < 0) |
4251 | goto out; | |
4252 | p = reply_buf; | |
f40eb349 AE |
4253 | end = reply_buf + ret; |
4254 | ||
9e15b77d AE |
4255 | image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
4256 | if (IS_ERR(image_name)) | |
4257 | image_name = NULL; | |
4258 | else | |
4259 | dout("%s: name is %s len is %zd\n", __func__, image_name, len); | |
4260 | out: | |
4261 | kfree(reply_buf); | |
4262 | kfree(image_id); | |
4263 | ||
4264 | return image_name; | |
4265 | } | |
4266 | ||
2ad3d716 AE |
4267 | static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
4268 | { | |
4269 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4270 | const char *snap_name; | |
4271 | u32 which = 0; | |
4272 | ||
4273 | /* Skip over names until we find the one we are looking for */ | |
4274 | ||
4275 | snap_name = rbd_dev->header.snap_names; | |
4276 | while (which < snapc->num_snaps) { | |
4277 | if (!strcmp(name, snap_name)) | |
4278 | return snapc->snaps[which]; | |
4279 | snap_name += strlen(snap_name) + 1; | |
4280 | which++; | |
4281 | } | |
4282 | return CEPH_NOSNAP; | |
4283 | } | |
4284 | ||
4285 | static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4286 | { | |
4287 | struct ceph_snap_context *snapc = rbd_dev->header.snapc; | |
4288 | u32 which; | |
4289 | bool found = false; | |
4290 | u64 snap_id; | |
4291 | ||
4292 | for (which = 0; !found && which < snapc->num_snaps; which++) { | |
4293 | const char *snap_name; | |
4294 | ||
4295 | snap_id = snapc->snaps[which]; | |
4296 | snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); | |
efadc98a JD |
4297 | if (IS_ERR(snap_name)) { |
4298 | /* ignore no-longer existing snapshots */ | |
4299 | if (PTR_ERR(snap_name) == -ENOENT) | |
4300 | continue; | |
4301 | else | |
4302 | break; | |
4303 | } | |
2ad3d716 AE |
4304 | found = !strcmp(name, snap_name); |
4305 | kfree(snap_name); | |
4306 | } | |
4307 | return found ? snap_id : CEPH_NOSNAP; | |
4308 | } | |
4309 | ||
4310 | /* | |
4311 | * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if | |
4312 | * no snapshot by that name is found, or if an error occurs. | |
4313 | */ | |
4314 | static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) | |
4315 | { | |
4316 | if (rbd_dev->image_format == 1) | |
4317 | return rbd_v1_snap_id_by_name(rbd_dev, name); | |
4318 | ||
4319 | return rbd_v2_snap_id_by_name(rbd_dev, name); | |
4320 | } | |
4321 | ||
9e15b77d | 4322 | /* |
04077599 ID |
4323 | * An image being mapped will have everything but the snap id. |
4324 | */ | |
4325 | static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) | |
4326 | { | |
4327 | struct rbd_spec *spec = rbd_dev->spec; | |
4328 | ||
4329 | rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); | |
4330 | rbd_assert(spec->image_id && spec->image_name); | |
4331 | rbd_assert(spec->snap_name); | |
4332 | ||
4333 | if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { | |
4334 | u64 snap_id; | |
4335 | ||
4336 | snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); | |
4337 | if (snap_id == CEPH_NOSNAP) | |
4338 | return -ENOENT; | |
4339 | ||
4340 | spec->snap_id = snap_id; | |
4341 | } else { | |
4342 | spec->snap_id = CEPH_NOSNAP; | |
4343 | } | |
4344 | ||
4345 | return 0; | |
4346 | } | |
4347 | ||
4348 | /* | |
4349 | * A parent image will have all ids but none of the names. | |
e1d4213f | 4350 | * |
04077599 ID |
4351 | * All names in an rbd spec are dynamically allocated. It's OK if we |
4352 | * can't figure out the name for an image id. | |
9e15b77d | 4353 | */ |
04077599 | 4354 | static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
9e15b77d | 4355 | { |
2e9f7f1c AE |
4356 | struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
4357 | struct rbd_spec *spec = rbd_dev->spec; | |
4358 | const char *pool_name; | |
4359 | const char *image_name; | |
4360 | const char *snap_name; | |
9e15b77d AE |
4361 | int ret; |
4362 | ||
04077599 ID |
4363 | rbd_assert(spec->pool_id != CEPH_NOPOOL); |
4364 | rbd_assert(spec->image_id); | |
4365 | rbd_assert(spec->snap_id != CEPH_NOSNAP); | |
9e15b77d | 4366 | |
2e9f7f1c | 4367 | /* Get the pool name; we have to make our own copy of this */ |
9e15b77d | 4368 | |
2e9f7f1c AE |
4369 | pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
4370 | if (!pool_name) { | |
4371 | rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); | |
935dc89f AE |
4372 | return -EIO; |
4373 | } | |
2e9f7f1c AE |
4374 | pool_name = kstrdup(pool_name, GFP_KERNEL); |
4375 | if (!pool_name) | |
9e15b77d AE |
4376 | return -ENOMEM; |
4377 | ||
4378 | /* Fetch the image name; tolerate failure here */ | |
4379 | ||
2e9f7f1c AE |
4380 | image_name = rbd_dev_image_name(rbd_dev); |
4381 | if (!image_name) | |
06ecc6cb | 4382 | rbd_warn(rbd_dev, "unable to get image name"); |
9e15b77d | 4383 | |
04077599 | 4384 | /* Fetch the snapshot name */ |
9e15b77d | 4385 | |
2e9f7f1c | 4386 | snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
da6a6b63 JD |
4387 | if (IS_ERR(snap_name)) { |
4388 | ret = PTR_ERR(snap_name); | |
9e15b77d | 4389 | goto out_err; |
2e9f7f1c AE |
4390 | } |
4391 | ||
4392 | spec->pool_name = pool_name; | |
4393 | spec->image_name = image_name; | |
4394 | spec->snap_name = snap_name; | |
9e15b77d AE |
4395 | |
4396 | return 0; | |
04077599 | 4397 | |
9e15b77d | 4398 | out_err: |
2e9f7f1c AE |
4399 | kfree(image_name); |
4400 | kfree(pool_name); | |
9e15b77d AE |
4401 | return ret; |
4402 | } | |
4403 | ||
cc4a38bd | 4404 | static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
35d489f9 AE |
4405 | { |
4406 | size_t size; | |
4407 | int ret; | |
4408 | void *reply_buf; | |
4409 | void *p; | |
4410 | void *end; | |
4411 | u64 seq; | |
4412 | u32 snap_count; | |
4413 | struct ceph_snap_context *snapc; | |
4414 | u32 i; | |
4415 | ||
4416 | /* | |
4417 | * We'll need room for the seq value (maximum snapshot id), | |
4418 | * snapshot count, and array of that many snapshot ids. | |
4419 | * For now we have a fixed upper limit on the number we're | |
4420 | * prepared to receive. | |
4421 | */ | |
4422 | size = sizeof (__le64) + sizeof (__le32) + | |
4423 | RBD_MAX_SNAP_COUNT * sizeof (__le64); | |
4424 | reply_buf = kzalloc(size, GFP_KERNEL); | |
4425 | if (!reply_buf) | |
4426 | return -ENOMEM; | |
4427 | ||
36be9a76 | 4428 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
4157976b | 4429 | "rbd", "get_snapcontext", NULL, 0, |
e2a58ee5 | 4430 | reply_buf, size); |
36be9a76 | 4431 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
35d489f9 AE |
4432 | if (ret < 0) |
4433 | goto out; | |
4434 | ||
35d489f9 | 4435 | p = reply_buf; |
57385b51 AE |
4436 | end = reply_buf + ret; |
4437 | ret = -ERANGE; | |
35d489f9 AE |
4438 | ceph_decode_64_safe(&p, end, seq, out); |
4439 | ceph_decode_32_safe(&p, end, snap_count, out); | |
4440 | ||
4441 | /* | |
4442 | * Make sure the reported number of snapshot ids wouldn't go | |
4443 | * beyond the end of our buffer. But before checking that, | |
4444 | * make sure the computed size of the snapshot context we | |
4445 | * allocate is representable in a size_t. | |
4446 | */ | |
4447 | if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) | |
4448 | / sizeof (u64)) { | |
4449 | ret = -EINVAL; | |
4450 | goto out; | |
4451 | } | |
4452 | if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) | |
4453 | goto out; | |
468521c1 | 4454 | ret = 0; |
35d489f9 | 4455 | |
812164f8 | 4456 | snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
35d489f9 AE |
4457 | if (!snapc) { |
4458 | ret = -ENOMEM; | |
4459 | goto out; | |
4460 | } | |
35d489f9 | 4461 | snapc->seq = seq; |
35d489f9 AE |
4462 | for (i = 0; i < snap_count; i++) |
4463 | snapc->snaps[i] = ceph_decode_64(&p); | |
4464 | ||
49ece554 | 4465 | ceph_put_snap_context(rbd_dev->header.snapc); |
35d489f9 AE |
4466 | rbd_dev->header.snapc = snapc; |
4467 | ||
4468 | dout(" snap context seq = %llu, snap_count = %u\n", | |
57385b51 | 4469 | (unsigned long long)seq, (unsigned int)snap_count); |
35d489f9 AE |
4470 | out: |
4471 | kfree(reply_buf); | |
4472 | ||
57385b51 | 4473 | return ret; |
35d489f9 AE |
4474 | } |
4475 | ||
54cac61f AE |
4476 | static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
4477 | u64 snap_id) | |
b8b1e2db AE |
4478 | { |
4479 | size_t size; | |
4480 | void *reply_buf; | |
54cac61f | 4481 | __le64 snapid; |
b8b1e2db AE |
4482 | int ret; |
4483 | void *p; | |
4484 | void *end; | |
b8b1e2db AE |
4485 | char *snap_name; |
4486 | ||
4487 | size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; | |
4488 | reply_buf = kmalloc(size, GFP_KERNEL); | |
4489 | if (!reply_buf) | |
4490 | return ERR_PTR(-ENOMEM); | |
4491 | ||
54cac61f | 4492 | snapid = cpu_to_le64(snap_id); |
36be9a76 | 4493 | ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
b8b1e2db | 4494 | "rbd", "get_snapshot_name", |
54cac61f | 4495 | &snapid, sizeof (snapid), |
e2a58ee5 | 4496 | reply_buf, size); |
36be9a76 | 4497 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
f40eb349 AE |
4498 | if (ret < 0) { |
4499 | snap_name = ERR_PTR(ret); | |
b8b1e2db | 4500 | goto out; |
f40eb349 | 4501 | } |
b8b1e2db AE |
4502 | |
4503 | p = reply_buf; | |
f40eb349 | 4504 | end = reply_buf + ret; |
e5c35534 | 4505 | snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
f40eb349 | 4506 | if (IS_ERR(snap_name)) |
b8b1e2db | 4507 | goto out; |
b8b1e2db | 4508 | |
f40eb349 | 4509 | dout(" snap_id 0x%016llx snap_name = %s\n", |
54cac61f | 4510 | (unsigned long long)snap_id, snap_name); |
b8b1e2db AE |
4511 | out: |
4512 | kfree(reply_buf); | |
4513 | ||
f40eb349 | 4514 | return snap_name; |
b8b1e2db AE |
4515 | } |
4516 | ||
2df3fac7 | 4517 | static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
117973fb | 4518 | { |
2df3fac7 | 4519 | bool first_time = rbd_dev->header.object_prefix == NULL; |
117973fb | 4520 | int ret; |
117973fb | 4521 | |
1617e40c JD |
4522 | ret = rbd_dev_v2_image_size(rbd_dev); |
4523 | if (ret) | |
cfbf6377 | 4524 | return ret; |
1617e40c | 4525 | |
2df3fac7 AE |
4526 | if (first_time) { |
4527 | ret = rbd_dev_v2_header_onetime(rbd_dev); | |
4528 | if (ret) | |
cfbf6377 | 4529 | return ret; |
2df3fac7 AE |
4530 | } |
4531 | ||
cc4a38bd | 4532 | ret = rbd_dev_v2_snap_context(rbd_dev); |
117973fb | 4533 | dout("rbd_dev_v2_snap_context returned %d\n", ret); |
117973fb AE |
4534 | |
4535 | return ret; | |
4536 | } | |
4537 | ||
a720ae09 ID |
4538 | static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
4539 | { | |
4540 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
4541 | ||
4542 | if (rbd_dev->image_format == 1) | |
4543 | return rbd_dev_v1_header_info(rbd_dev); | |
4544 | ||
4545 | return rbd_dev_v2_header_info(rbd_dev); | |
4546 | } | |
4547 | ||
dfc5606d YS |
4548 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
4549 | { | |
dfc5606d | 4550 | struct device *dev; |
cd789ab9 | 4551 | int ret; |
dfc5606d | 4552 | |
cd789ab9 | 4553 | dev = &rbd_dev->dev; |
dfc5606d YS |
4554 | dev->bus = &rbd_bus_type; |
4555 | dev->type = &rbd_device_type; | |
4556 | dev->parent = &rbd_root_dev; | |
200a6a8b | 4557 | dev->release = rbd_dev_device_release; |
de71a297 | 4558 | dev_set_name(dev, "%d", rbd_dev->dev_id); |
dfc5606d | 4559 | ret = device_register(dev); |
dfc5606d | 4560 | |
dfc5606d | 4561 | return ret; |
602adf40 YS |
4562 | } |
4563 | ||
dfc5606d YS |
4564 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
4565 | { | |
4566 | device_unregister(&rbd_dev->dev); | |
4567 | } | |
4568 | ||
1ddbe94e | 4569 | /* |
499afd5b | 4570 | * Get a unique rbd identifier for the given new rbd_dev, and add |
f8a22fc2 | 4571 | * the rbd_dev to the global list. |
1ddbe94e | 4572 | */ |
f8a22fc2 | 4573 | static int rbd_dev_id_get(struct rbd_device *rbd_dev) |
b7f23c36 | 4574 | { |
f8a22fc2 ID |
4575 | int new_dev_id; |
4576 | ||
9b60e70b ID |
4577 | new_dev_id = ida_simple_get(&rbd_dev_id_ida, |
4578 | 0, minor_to_rbd_dev_id(1 << MINORBITS), | |
4579 | GFP_KERNEL); | |
f8a22fc2 ID |
4580 | if (new_dev_id < 0) |
4581 | return new_dev_id; | |
4582 | ||
4583 | rbd_dev->dev_id = new_dev_id; | |
499afd5b AE |
4584 | |
4585 | spin_lock(&rbd_dev_list_lock); | |
4586 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
4587 | spin_unlock(&rbd_dev_list_lock); | |
f8a22fc2 | 4588 | |
70eebd20 | 4589 | dout("rbd_dev %p given dev id %d\n", rbd_dev, rbd_dev->dev_id); |
f8a22fc2 ID |
4590 | |
4591 | return 0; | |
1ddbe94e | 4592 | } |
b7f23c36 | 4593 | |
1ddbe94e | 4594 | /* |
499afd5b AE |
4595 | * Remove an rbd_dev from the global list, and record that its |
4596 | * identifier is no longer in use. | |
1ddbe94e | 4597 | */ |
e2839308 | 4598 | static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
1ddbe94e | 4599 | { |
499afd5b AE |
4600 | spin_lock(&rbd_dev_list_lock); |
4601 | list_del_init(&rbd_dev->node); | |
4602 | spin_unlock(&rbd_dev_list_lock); | |
b7f23c36 | 4603 | |
f8a22fc2 ID |
4604 | ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
4605 | ||
4606 | dout("rbd_dev %p released dev id %d\n", rbd_dev, rbd_dev->dev_id); | |
b7f23c36 AE |
4607 | } |
4608 | ||
e28fff26 AE |
4609 | /* |
4610 | * Skips over white space at *buf, and updates *buf to point to the | |
4611 | * first found non-space character (if any). Returns the length of | |
593a9e7b AE |
4612 | * the token (string of non-white space characters) found. Note |
4613 | * that *buf must be terminated with '\0'. | |
e28fff26 AE |
4614 | */ |
4615 | static inline size_t next_token(const char **buf) | |
4616 | { | |
4617 | /* | |
4618 | * These are the characters that produce nonzero for | |
4619 | * isspace() in the "C" and "POSIX" locales. | |
4620 | */ | |
4621 | const char *spaces = " \f\n\r\t\v"; | |
4622 | ||
4623 | *buf += strspn(*buf, spaces); /* Find start of token */ | |
4624 | ||
4625 | return strcspn(*buf, spaces); /* Return token length */ | |
4626 | } | |
4627 | ||
4628 | /* | |
4629 | * Finds the next token in *buf, and if the provided token buffer is | |
4630 | * big enough, copies the found token into it. The result, if | |
593a9e7b AE |
4631 | * copied, is guaranteed to be terminated with '\0'. Note that *buf |
4632 | * must be terminated with '\0' on entry. | |
e28fff26 AE |
4633 | * |
4634 | * Returns the length of the token found (not including the '\0'). | |
4635 | * Return value will be 0 if no token is found, and it will be >= | |
4636 | * token_size if the token would not fit. | |
4637 | * | |
593a9e7b | 4638 | * The *buf pointer will be updated to point beyond the end of the |
e28fff26 AE |
4639 | * found token. Note that this occurs even if the token buffer is |
4640 | * too small to hold it. | |
4641 | */ | |
4642 | static inline size_t copy_token(const char **buf, | |
4643 | char *token, | |
4644 | size_t token_size) | |
4645 | { | |
4646 | size_t len; | |
4647 | ||
4648 | len = next_token(buf); | |
4649 | if (len < token_size) { | |
4650 | memcpy(token, *buf, len); | |
4651 | *(token + len) = '\0'; | |
4652 | } | |
4653 | *buf += len; | |
4654 | ||
4655 | return len; | |
4656 | } | |
4657 | ||
ea3352f4 AE |
4658 | /* |
4659 | * Finds the next token in *buf, dynamically allocates a buffer big | |
4660 | * enough to hold a copy of it, and copies the token into the new | |
4661 | * buffer. The copy is guaranteed to be terminated with '\0'. Note | |
4662 | * that a duplicate buffer is created even for a zero-length token. | |
4663 | * | |
4664 | * Returns a pointer to the newly-allocated duplicate, or a null | |
4665 | * pointer if memory for the duplicate was not available. If | |
4666 | * the lenp argument is a non-null pointer, the length of the token | |
4667 | * (not including the '\0') is returned in *lenp. | |
4668 | * | |
4669 | * If successful, the *buf pointer will be updated to point beyond | |
4670 | * the end of the found token. | |
4671 | * | |
4672 | * Note: uses GFP_KERNEL for allocation. | |
4673 | */ | |
4674 | static inline char *dup_token(const char **buf, size_t *lenp) | |
4675 | { | |
4676 | char *dup; | |
4677 | size_t len; | |
4678 | ||
4679 | len = next_token(buf); | |
4caf35f9 | 4680 | dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
ea3352f4 AE |
4681 | if (!dup) |
4682 | return NULL; | |
ea3352f4 AE |
4683 | *(dup + len) = '\0'; |
4684 | *buf += len; | |
4685 | ||
4686 | if (lenp) | |
4687 | *lenp = len; | |
4688 | ||
4689 | return dup; | |
4690 | } | |
4691 | ||
a725f65e | 4692 | /* |
859c31df AE |
4693 | * Parse the options provided for an "rbd add" (i.e., rbd image |
4694 | * mapping) request. These arrive via a write to /sys/bus/rbd/add, | |
4695 | * and the data written is passed here via a NUL-terminated buffer. | |
4696 | * Returns 0 if successful or an error code otherwise. | |
d22f76e7 | 4697 | * |
859c31df AE |
4698 | * The information extracted from these options is recorded in |
4699 | * the other parameters which return dynamically-allocated | |
4700 | * structures: | |
4701 | * ceph_opts | |
4702 | * The address of a pointer that will refer to a ceph options | |
4703 | * structure. Caller must release the returned pointer using | |
4704 | * ceph_destroy_options() when it is no longer needed. | |
4705 | * rbd_opts | |
4706 | * Address of an rbd options pointer. Fully initialized by | |
4707 | * this function; caller must release with kfree(). | |
4708 | * spec | |
4709 | * Address of an rbd image specification pointer. Fully | |
4710 | * initialized by this function based on parsed options. | |
4711 | * Caller must release with rbd_spec_put(). | |
4712 | * | |
4713 | * The options passed take this form: | |
4714 | * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] | |
4715 | * where: | |
4716 | * <mon_addrs> | |
4717 | * A comma-separated list of one or more monitor addresses. | |
4718 | * A monitor address is an ip address, optionally followed | |
4719 | * by a port number (separated by a colon). | |
4720 | * I.e.: ip1[:port1][,ip2[:port2]...] | |
4721 | * <options> | |
4722 | * A comma-separated list of ceph and/or rbd options. | |
4723 | * <pool_name> | |
4724 | * The name of the rados pool containing the rbd image. | |
4725 | * <image_name> | |
4726 | * The name of the image in that pool to map. | |
4727 | * <snap_id> | |
4728 | * An optional snapshot id. If provided, the mapping will | |
4729 | * present data from the image at the time that snapshot was | |
4730 | * created. The image head is used if no snapshot id is | |
4731 | * provided. Snapshot mappings are always read-only. | |
a725f65e | 4732 | */ |
859c31df | 4733 | static int rbd_add_parse_args(const char *buf, |
dc79b113 | 4734 | struct ceph_options **ceph_opts, |
859c31df AE |
4735 | struct rbd_options **opts, |
4736 | struct rbd_spec **rbd_spec) | |
e28fff26 | 4737 | { |
d22f76e7 | 4738 | size_t len; |
859c31df | 4739 | char *options; |
0ddebc0c | 4740 | const char *mon_addrs; |
ecb4dc22 | 4741 | char *snap_name; |
0ddebc0c | 4742 | size_t mon_addrs_size; |
859c31df | 4743 | struct rbd_spec *spec = NULL; |
4e9afeba | 4744 | struct rbd_options *rbd_opts = NULL; |
859c31df | 4745 | struct ceph_options *copts; |
dc79b113 | 4746 | int ret; |
e28fff26 AE |
4747 | |
4748 | /* The first four tokens are required */ | |
4749 | ||
7ef3214a | 4750 | len = next_token(&buf); |
4fb5d671 AE |
4751 | if (!len) { |
4752 | rbd_warn(NULL, "no monitor address(es) provided"); | |
4753 | return -EINVAL; | |
4754 | } | |
0ddebc0c | 4755 | mon_addrs = buf; |
f28e565a | 4756 | mon_addrs_size = len + 1; |
7ef3214a | 4757 | buf += len; |
a725f65e | 4758 | |
dc79b113 | 4759 | ret = -EINVAL; |
f28e565a AE |
4760 | options = dup_token(&buf, NULL); |
4761 | if (!options) | |
dc79b113 | 4762 | return -ENOMEM; |
4fb5d671 AE |
4763 | if (!*options) { |
4764 | rbd_warn(NULL, "no options provided"); | |
4765 | goto out_err; | |
4766 | } | |
e28fff26 | 4767 | |
859c31df AE |
4768 | spec = rbd_spec_alloc(); |
4769 | if (!spec) | |
f28e565a | 4770 | goto out_mem; |
859c31df AE |
4771 | |
4772 | spec->pool_name = dup_token(&buf, NULL); | |
4773 | if (!spec->pool_name) | |
4774 | goto out_mem; | |
4fb5d671 AE |
4775 | if (!*spec->pool_name) { |
4776 | rbd_warn(NULL, "no pool name provided"); | |
4777 | goto out_err; | |
4778 | } | |
e28fff26 | 4779 | |
69e7a02f | 4780 | spec->image_name = dup_token(&buf, NULL); |
859c31df | 4781 | if (!spec->image_name) |
f28e565a | 4782 | goto out_mem; |
4fb5d671 AE |
4783 | if (!*spec->image_name) { |
4784 | rbd_warn(NULL, "no image name provided"); | |
4785 | goto out_err; | |
4786 | } | |
d4b125e9 | 4787 | |
f28e565a AE |
4788 | /* |
4789 | * Snapshot name is optional; default is to use "-" | |
4790 | * (indicating the head/no snapshot). | |
4791 | */ | |
3feeb894 | 4792 | len = next_token(&buf); |
820a5f3e | 4793 | if (!len) { |
3feeb894 AE |
4794 | buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
4795 | len = sizeof (RBD_SNAP_HEAD_NAME) - 1; | |
f28e565a | 4796 | } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
dc79b113 | 4797 | ret = -ENAMETOOLONG; |
f28e565a | 4798 | goto out_err; |
849b4260 | 4799 | } |
ecb4dc22 AE |
4800 | snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
4801 | if (!snap_name) | |
f28e565a | 4802 | goto out_mem; |
ecb4dc22 AE |
4803 | *(snap_name + len) = '\0'; |
4804 | spec->snap_name = snap_name; | |
e5c35534 | 4805 | |
0ddebc0c | 4806 | /* Initialize all rbd options to the defaults */ |
e28fff26 | 4807 | |
4e9afeba AE |
4808 | rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
4809 | if (!rbd_opts) | |
4810 | goto out_mem; | |
4811 | ||
4812 | rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; | |
d22f76e7 | 4813 | |
859c31df | 4814 | copts = ceph_parse_options(options, mon_addrs, |
0ddebc0c | 4815 | mon_addrs + mon_addrs_size - 1, |
4e9afeba | 4816 | parse_rbd_opts_token, rbd_opts); |
859c31df AE |
4817 | if (IS_ERR(copts)) { |
4818 | ret = PTR_ERR(copts); | |
dc79b113 AE |
4819 | goto out_err; |
4820 | } | |
859c31df AE |
4821 | kfree(options); |
4822 | ||
4823 | *ceph_opts = copts; | |
4e9afeba | 4824 | *opts = rbd_opts; |
859c31df | 4825 | *rbd_spec = spec; |
0ddebc0c | 4826 | |
dc79b113 | 4827 | return 0; |
f28e565a | 4828 | out_mem: |
dc79b113 | 4829 | ret = -ENOMEM; |
d22f76e7 | 4830 | out_err: |
859c31df AE |
4831 | kfree(rbd_opts); |
4832 | rbd_spec_put(spec); | |
f28e565a | 4833 | kfree(options); |
d22f76e7 | 4834 | |
dc79b113 | 4835 | return ret; |
a725f65e AE |
4836 | } |
4837 | ||
30ba1f02 ID |
4838 | /* |
4839 | * Return pool id (>= 0) or a negative error code. | |
4840 | */ | |
4841 | static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) | |
4842 | { | |
4843 | u64 newest_epoch; | |
4844 | unsigned long timeout = rbdc->client->options->mount_timeout * HZ; | |
4845 | int tries = 0; | |
4846 | int ret; | |
4847 | ||
4848 | again: | |
4849 | ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); | |
4850 | if (ret == -ENOENT && tries++ < 1) { | |
4851 | ret = ceph_monc_do_get_version(&rbdc->client->monc, "osdmap", | |
4852 | &newest_epoch); | |
4853 | if (ret < 0) | |
4854 | return ret; | |
4855 | ||
4856 | if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { | |
4857 | ceph_monc_request_next_osdmap(&rbdc->client->monc); | |
4858 | (void) ceph_monc_wait_osdmap(&rbdc->client->monc, | |
4859 | newest_epoch, timeout); | |
4860 | goto again; | |
4861 | } else { | |
4862 | /* the osdmap we have is new enough */ | |
4863 | return -ENOENT; | |
4864 | } | |
4865 | } | |
4866 | ||
4867 | return ret; | |
4868 | } | |
4869 | ||
589d30e0 AE |
4870 | /* |
4871 | * An rbd format 2 image has a unique identifier, distinct from the | |
4872 | * name given to it by the user. Internally, that identifier is | |
4873 | * what's used to specify the names of objects related to the image. | |
4874 | * | |
4875 | * A special "rbd id" object is used to map an rbd image name to its | |
4876 | * id. If that object doesn't exist, then there is no v2 rbd image | |
4877 | * with the supplied name. | |
4878 | * | |
4879 | * This function will record the given rbd_dev's image_id field if | |
4880 | * it can be determined, and in that case will return 0. If any | |
4881 | * errors occur a negative errno will be returned and the rbd_dev's | |
4882 | * image_id field will be unchanged (and should be NULL). | |
4883 | */ | |
4884 | static int rbd_dev_image_id(struct rbd_device *rbd_dev) | |
4885 | { | |
4886 | int ret; | |
4887 | size_t size; | |
4888 | char *object_name; | |
4889 | void *response; | |
c0fba368 | 4890 | char *image_id; |
2f82ee54 | 4891 | |
2c0d0a10 AE |
4892 | /* |
4893 | * When probing a parent image, the image id is already | |
4894 | * known (and the image name likely is not). There's no | |
c0fba368 AE |
4895 | * need to fetch the image id again in this case. We |
4896 | * do still need to set the image format though. | |
2c0d0a10 | 4897 | */ |
c0fba368 AE |
4898 | if (rbd_dev->spec->image_id) { |
4899 | rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; | |
4900 | ||
2c0d0a10 | 4901 | return 0; |
c0fba368 | 4902 | } |
2c0d0a10 | 4903 | |
589d30e0 AE |
4904 | /* |
4905 | * First, see if the format 2 image id file exists, and if | |
4906 | * so, get the image's persistent id from it. | |
4907 | */ | |
69e7a02f | 4908 | size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
589d30e0 AE |
4909 | object_name = kmalloc(size, GFP_NOIO); |
4910 | if (!object_name) | |
4911 | return -ENOMEM; | |
0d7dbfce | 4912 | sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
589d30e0 AE |
4913 | dout("rbd id object name is %s\n", object_name); |
4914 | ||
4915 | /* Response will be an encoded string, which includes a length */ | |
4916 | ||
4917 | size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; | |
4918 | response = kzalloc(size, GFP_NOIO); | |
4919 | if (!response) { | |
4920 | ret = -ENOMEM; | |
4921 | goto out; | |
4922 | } | |
4923 | ||
c0fba368 AE |
4924 | /* If it doesn't exist we'll assume it's a format 1 image */ |
4925 | ||
36be9a76 | 4926 | ret = rbd_obj_method_sync(rbd_dev, object_name, |
4157976b | 4927 | "rbd", "get_id", NULL, 0, |
e2a58ee5 | 4928 | response, RBD_IMAGE_ID_LEN_MAX); |
36be9a76 | 4929 | dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
c0fba368 AE |
4930 | if (ret == -ENOENT) { |
4931 | image_id = kstrdup("", GFP_KERNEL); | |
4932 | ret = image_id ? 0 : -ENOMEM; | |
4933 | if (!ret) | |
4934 | rbd_dev->image_format = 1; | |
7dd440c9 | 4935 | } else if (ret >= 0) { |
c0fba368 AE |
4936 | void *p = response; |
4937 | ||
4938 | image_id = ceph_extract_encoded_string(&p, p + ret, | |
979ed480 | 4939 | NULL, GFP_NOIO); |
461f758a | 4940 | ret = PTR_ERR_OR_ZERO(image_id); |
c0fba368 AE |
4941 | if (!ret) |
4942 | rbd_dev->image_format = 2; | |
c0fba368 AE |
4943 | } |
4944 | ||
4945 | if (!ret) { | |
4946 | rbd_dev->spec->image_id = image_id; | |
4947 | dout("image_id is %s\n", image_id); | |
589d30e0 AE |
4948 | } |
4949 | out: | |
4950 | kfree(response); | |
4951 | kfree(object_name); | |
4952 | ||
4953 | return ret; | |
4954 | } | |
4955 | ||
3abef3b3 AE |
4956 | /* |
4957 | * Undo whatever state changes are made by v1 or v2 header info | |
4958 | * call. | |
4959 | */ | |
6fd48b3b AE |
4960 | static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
4961 | { | |
4962 | struct rbd_image_header *header; | |
4963 | ||
392a9dad AE |
4964 | /* Drop parent reference unless it's already been done (or none) */ |
4965 | ||
4966 | if (rbd_dev->parent_overlap) | |
4967 | rbd_dev_parent_put(rbd_dev); | |
6fd48b3b AE |
4968 | |
4969 | /* Free dynamic fields from the header, then zero it out */ | |
4970 | ||
4971 | header = &rbd_dev->header; | |
812164f8 | 4972 | ceph_put_snap_context(header->snapc); |
6fd48b3b AE |
4973 | kfree(header->snap_sizes); |
4974 | kfree(header->snap_names); | |
4975 | kfree(header->object_prefix); | |
4976 | memset(header, 0, sizeof (*header)); | |
4977 | } | |
4978 | ||
2df3fac7 | 4979 | static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
a30b71b9 AE |
4980 | { |
4981 | int ret; | |
a30b71b9 | 4982 | |
1e130199 | 4983 | ret = rbd_dev_v2_object_prefix(rbd_dev); |
57385b51 | 4984 | if (ret) |
b1b5402a AE |
4985 | goto out_err; |
4986 | ||
2df3fac7 AE |
4987 | /* |
4988 | * Get the and check features for the image. Currently the | |
4989 | * features are assumed to never change. | |
4990 | */ | |
b1b5402a | 4991 | ret = rbd_dev_v2_features(rbd_dev); |
57385b51 | 4992 | if (ret) |
9d475de5 | 4993 | goto out_err; |
35d489f9 | 4994 | |
cc070d59 AE |
4995 | /* If the image supports fancy striping, get its parameters */ |
4996 | ||
4997 | if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { | |
4998 | ret = rbd_dev_v2_striping_info(rbd_dev); | |
4999 | if (ret < 0) | |
5000 | goto out_err; | |
5001 | } | |
2df3fac7 | 5002 | /* No support for crypto and compression type format 2 images */ |
a30b71b9 | 5003 | |
35152979 | 5004 | return 0; |
9d475de5 | 5005 | out_err: |
642a2537 | 5006 | rbd_dev->header.features = 0; |
1e130199 AE |
5007 | kfree(rbd_dev->header.object_prefix); |
5008 | rbd_dev->header.object_prefix = NULL; | |
9d475de5 AE |
5009 | |
5010 | return ret; | |
a30b71b9 AE |
5011 | } |
5012 | ||
124afba2 | 5013 | static int rbd_dev_probe_parent(struct rbd_device *rbd_dev) |
83a06263 | 5014 | { |
2f82ee54 | 5015 | struct rbd_device *parent = NULL; |
124afba2 AE |
5016 | struct rbd_spec *parent_spec; |
5017 | struct rbd_client *rbdc; | |
5018 | int ret; | |
5019 | ||
5020 | if (!rbd_dev->parent_spec) | |
5021 | return 0; | |
5022 | /* | |
5023 | * We need to pass a reference to the client and the parent | |
5024 | * spec when creating the parent rbd_dev. Images related by | |
5025 | * parent/child relationships always share both. | |
5026 | */ | |
5027 | parent_spec = rbd_spec_get(rbd_dev->parent_spec); | |
5028 | rbdc = __rbd_get_client(rbd_dev->rbd_client); | |
5029 | ||
5030 | ret = -ENOMEM; | |
5031 | parent = rbd_dev_create(rbdc, parent_spec); | |
5032 | if (!parent) | |
5033 | goto out_err; | |
5034 | ||
1f3ef788 | 5035 | ret = rbd_dev_image_probe(parent, false); |
124afba2 AE |
5036 | if (ret < 0) |
5037 | goto out_err; | |
5038 | rbd_dev->parent = parent; | |
a2acd00e | 5039 | atomic_set(&rbd_dev->parent_ref, 1); |
124afba2 AE |
5040 | |
5041 | return 0; | |
5042 | out_err: | |
5043 | if (parent) { | |
fb65d228 | 5044 | rbd_dev_unparent(rbd_dev); |
124afba2 AE |
5045 | kfree(rbd_dev->header_name); |
5046 | rbd_dev_destroy(parent); | |
5047 | } else { | |
5048 | rbd_put_client(rbdc); | |
5049 | rbd_spec_put(parent_spec); | |
5050 | } | |
5051 | ||
5052 | return ret; | |
5053 | } | |
5054 | ||
200a6a8b | 5055 | static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
124afba2 | 5056 | { |
83a06263 | 5057 | int ret; |
d1cf5788 | 5058 | |
f8a22fc2 ID |
5059 | /* Get an id and fill in device name. */ |
5060 | ||
5061 | ret = rbd_dev_id_get(rbd_dev); | |
5062 | if (ret) | |
5063 | return ret; | |
83a06263 | 5064 | |
83a06263 AE |
5065 | BUILD_BUG_ON(DEV_NAME_LEN |
5066 | < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); | |
5067 | sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); | |
5068 | ||
9b60e70b | 5069 | /* Record our major and minor device numbers. */ |
83a06263 | 5070 | |
9b60e70b ID |
5071 | if (!single_major) { |
5072 | ret = register_blkdev(0, rbd_dev->name); | |
5073 | if (ret < 0) | |
5074 | goto err_out_id; | |
5075 | ||
5076 | rbd_dev->major = ret; | |
5077 | rbd_dev->minor = 0; | |
5078 | } else { | |
5079 | rbd_dev->major = rbd_major; | |
5080 | rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); | |
5081 | } | |
83a06263 AE |
5082 | |
5083 | /* Set up the blkdev mapping. */ | |
5084 | ||
5085 | ret = rbd_init_disk(rbd_dev); | |
5086 | if (ret) | |
5087 | goto err_out_blkdev; | |
5088 | ||
f35a4dee | 5089 | ret = rbd_dev_mapping_set(rbd_dev); |
83a06263 AE |
5090 | if (ret) |
5091 | goto err_out_disk; | |
bc1ecc65 | 5092 | |
f35a4dee | 5093 | set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
22001f61 | 5094 | set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
f35a4dee | 5095 | |
58d1362b | 5096 | rbd_dev->rq_wq = alloc_workqueue("%s", 0, 0, rbd_dev->disk->disk_name); |
255939e7 WY |
5097 | if (!rbd_dev->rq_wq) { |
5098 | ret = -ENOMEM; | |
bc1ecc65 | 5099 | goto err_out_mapping; |
255939e7 | 5100 | } |
bc1ecc65 | 5101 | |
f35a4dee AE |
5102 | ret = rbd_bus_add_dev(rbd_dev); |
5103 | if (ret) | |
bc1ecc65 | 5104 | goto err_out_workqueue; |
83a06263 | 5105 | |
83a06263 AE |
5106 | /* Everything's ready. Announce the disk to the world. */ |
5107 | ||
129b79d4 | 5108 | set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
83a06263 AE |
5109 | add_disk(rbd_dev->disk); |
5110 | ||
5111 | pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, | |
5112 | (unsigned long long) rbd_dev->mapping.size); | |
5113 | ||
5114 | return ret; | |
2f82ee54 | 5115 | |
bc1ecc65 ID |
5116 | err_out_workqueue: |
5117 | destroy_workqueue(rbd_dev->rq_wq); | |
5118 | rbd_dev->rq_wq = NULL; | |
f35a4dee AE |
5119 | err_out_mapping: |
5120 | rbd_dev_mapping_clear(rbd_dev); | |
83a06263 AE |
5121 | err_out_disk: |
5122 | rbd_free_disk(rbd_dev); | |
5123 | err_out_blkdev: | |
9b60e70b ID |
5124 | if (!single_major) |
5125 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
83a06263 AE |
5126 | err_out_id: |
5127 | rbd_dev_id_put(rbd_dev); | |
d1cf5788 | 5128 | rbd_dev_mapping_clear(rbd_dev); |
83a06263 AE |
5129 | |
5130 | return ret; | |
5131 | } | |
5132 | ||
332bb12d AE |
5133 | static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
5134 | { | |
5135 | struct rbd_spec *spec = rbd_dev->spec; | |
5136 | size_t size; | |
5137 | ||
5138 | /* Record the header object name for this rbd image. */ | |
5139 | ||
5140 | rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); | |
5141 | ||
5142 | if (rbd_dev->image_format == 1) | |
5143 | size = strlen(spec->image_name) + sizeof (RBD_SUFFIX); | |
5144 | else | |
5145 | size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id); | |
5146 | ||
5147 | rbd_dev->header_name = kmalloc(size, GFP_KERNEL); | |
5148 | if (!rbd_dev->header_name) | |
5149 | return -ENOMEM; | |
5150 | ||
5151 | if (rbd_dev->image_format == 1) | |
5152 | sprintf(rbd_dev->header_name, "%s%s", | |
5153 | spec->image_name, RBD_SUFFIX); | |
5154 | else | |
5155 | sprintf(rbd_dev->header_name, "%s%s", | |
5156 | RBD_HEADER_PREFIX, spec->image_id); | |
5157 | return 0; | |
5158 | } | |
5159 | ||
200a6a8b AE |
5160 | static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
5161 | { | |
6fd48b3b | 5162 | rbd_dev_unprobe(rbd_dev); |
200a6a8b | 5163 | kfree(rbd_dev->header_name); |
6fd48b3b AE |
5164 | rbd_dev->header_name = NULL; |
5165 | rbd_dev->image_format = 0; | |
5166 | kfree(rbd_dev->spec->image_id); | |
5167 | rbd_dev->spec->image_id = NULL; | |
5168 | ||
200a6a8b AE |
5169 | rbd_dev_destroy(rbd_dev); |
5170 | } | |
5171 | ||
a30b71b9 AE |
5172 | /* |
5173 | * Probe for the existence of the header object for the given rbd | |
1f3ef788 AE |
5174 | * device. If this image is the one being mapped (i.e., not a |
5175 | * parent), initiate a watch on its header object before using that | |
5176 | * object to get detailed information about the rbd image. | |
a30b71b9 | 5177 | */ |
1f3ef788 | 5178 | static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping) |
a30b71b9 AE |
5179 | { |
5180 | int ret; | |
5181 | ||
5182 | /* | |
3abef3b3 AE |
5183 | * Get the id from the image id object. Unless there's an |
5184 | * error, rbd_dev->spec->image_id will be filled in with | |
5185 | * a dynamically-allocated string, and rbd_dev->image_format | |
5186 | * will be set to either 1 or 2. | |
a30b71b9 AE |
5187 | */ |
5188 | ret = rbd_dev_image_id(rbd_dev); | |
5189 | if (ret) | |
c0fba368 | 5190 | return ret; |
c0fba368 | 5191 | |
332bb12d AE |
5192 | ret = rbd_dev_header_name(rbd_dev); |
5193 | if (ret) | |
5194 | goto err_out_format; | |
5195 | ||
1f3ef788 | 5196 | if (mapping) { |
fca27065 | 5197 | ret = rbd_dev_header_watch_sync(rbd_dev); |
1f3ef788 AE |
5198 | if (ret) |
5199 | goto out_header_name; | |
5200 | } | |
b644de2b | 5201 | |
a720ae09 | 5202 | ret = rbd_dev_header_info(rbd_dev); |
5655c4d9 | 5203 | if (ret) |
b644de2b | 5204 | goto err_out_watch; |
83a06263 | 5205 | |
04077599 ID |
5206 | /* |
5207 | * If this image is the one being mapped, we have pool name and | |
5208 | * id, image name and id, and snap name - need to fill snap id. | |
5209 | * Otherwise this is a parent image, identified by pool, image | |
5210 | * and snap ids - need to fill in names for those ids. | |
5211 | */ | |
5212 | if (mapping) | |
5213 | ret = rbd_spec_fill_snap_id(rbd_dev); | |
5214 | else | |
5215 | ret = rbd_spec_fill_names(rbd_dev); | |
9bb81c9b | 5216 | if (ret) |
33dca39f | 5217 | goto err_out_probe; |
9bb81c9b | 5218 | |
e8f59b59 ID |
5219 | if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
5220 | ret = rbd_dev_v2_parent_info(rbd_dev); | |
5221 | if (ret) | |
5222 | goto err_out_probe; | |
5223 | ||
5224 | /* | |
5225 | * Need to warn users if this image is the one being | |
5226 | * mapped and has a parent. | |
5227 | */ | |
5228 | if (mapping && rbd_dev->parent_spec) | |
5229 | rbd_warn(rbd_dev, | |
5230 | "WARNING: kernel layering is EXPERIMENTAL!"); | |
5231 | } | |
5232 | ||
9bb81c9b | 5233 | ret = rbd_dev_probe_parent(rbd_dev); |
30d60ba2 AE |
5234 | if (ret) |
5235 | goto err_out_probe; | |
5236 | ||
5237 | dout("discovered format %u image, header name is %s\n", | |
5238 | rbd_dev->image_format, rbd_dev->header_name); | |
30d60ba2 | 5239 | return 0; |
e8f59b59 | 5240 | |
6fd48b3b AE |
5241 | err_out_probe: |
5242 | rbd_dev_unprobe(rbd_dev); | |
b644de2b | 5243 | err_out_watch: |
fca27065 ID |
5244 | if (mapping) |
5245 | rbd_dev_header_unwatch_sync(rbd_dev); | |
332bb12d AE |
5246 | out_header_name: |
5247 | kfree(rbd_dev->header_name); | |
5248 | rbd_dev->header_name = NULL; | |
5249 | err_out_format: | |
5250 | rbd_dev->image_format = 0; | |
5655c4d9 AE |
5251 | kfree(rbd_dev->spec->image_id); |
5252 | rbd_dev->spec->image_id = NULL; | |
a30b71b9 AE |
5253 | return ret; |
5254 | } | |
5255 | ||
9b60e70b ID |
5256 | static ssize_t do_rbd_add(struct bus_type *bus, |
5257 | const char *buf, | |
5258 | size_t count) | |
602adf40 | 5259 | { |
cb8627c7 | 5260 | struct rbd_device *rbd_dev = NULL; |
dc79b113 | 5261 | struct ceph_options *ceph_opts = NULL; |
4e9afeba | 5262 | struct rbd_options *rbd_opts = NULL; |
859c31df | 5263 | struct rbd_spec *spec = NULL; |
9d3997fd | 5264 | struct rbd_client *rbdc; |
51344a38 | 5265 | bool read_only; |
27cc2594 | 5266 | int rc = -ENOMEM; |
602adf40 YS |
5267 | |
5268 | if (!try_module_get(THIS_MODULE)) | |
5269 | return -ENODEV; | |
5270 | ||
602adf40 | 5271 | /* parse add command */ |
859c31df | 5272 | rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
dc79b113 | 5273 | if (rc < 0) |
bd4ba655 | 5274 | goto err_out_module; |
51344a38 AE |
5275 | read_only = rbd_opts->read_only; |
5276 | kfree(rbd_opts); | |
5277 | rbd_opts = NULL; /* done with this */ | |
78cea76e | 5278 | |
9d3997fd AE |
5279 | rbdc = rbd_get_client(ceph_opts); |
5280 | if (IS_ERR(rbdc)) { | |
5281 | rc = PTR_ERR(rbdc); | |
0ddebc0c | 5282 | goto err_out_args; |
9d3997fd | 5283 | } |
602adf40 | 5284 | |
602adf40 | 5285 | /* pick the pool */ |
30ba1f02 | 5286 | rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
602adf40 YS |
5287 | if (rc < 0) |
5288 | goto err_out_client; | |
c0cd10db | 5289 | spec->pool_id = (u64)rc; |
859c31df | 5290 | |
0903e875 AE |
5291 | /* The ceph file layout needs to fit pool id in 32 bits */ |
5292 | ||
c0cd10db | 5293 | if (spec->pool_id > (u64)U32_MAX) { |
9584d508 | 5294 | rbd_warn(NULL, "pool id too large (%llu > %u)", |
c0cd10db | 5295 | (unsigned long long)spec->pool_id, U32_MAX); |
0903e875 AE |
5296 | rc = -EIO; |
5297 | goto err_out_client; | |
5298 | } | |
5299 | ||
c53d5893 | 5300 | rbd_dev = rbd_dev_create(rbdc, spec); |
bd4ba655 AE |
5301 | if (!rbd_dev) |
5302 | goto err_out_client; | |
c53d5893 AE |
5303 | rbdc = NULL; /* rbd_dev now owns this */ |
5304 | spec = NULL; /* rbd_dev now owns this */ | |
602adf40 | 5305 | |
1f3ef788 | 5306 | rc = rbd_dev_image_probe(rbd_dev, true); |
a30b71b9 | 5307 | if (rc < 0) |
c53d5893 | 5308 | goto err_out_rbd_dev; |
05fd6f6f | 5309 | |
7ce4eef7 AE |
5310 | /* If we are mapping a snapshot it must be marked read-only */ |
5311 | ||
5312 | if (rbd_dev->spec->snap_id != CEPH_NOSNAP) | |
5313 | read_only = true; | |
5314 | rbd_dev->mapping.read_only = read_only; | |
5315 | ||
b536f69a | 5316 | rc = rbd_dev_device_setup(rbd_dev); |
3abef3b3 | 5317 | if (rc) { |
e37180c0 ID |
5318 | /* |
5319 | * rbd_dev_header_unwatch_sync() can't be moved into | |
5320 | * rbd_dev_image_release() without refactoring, see | |
5321 | * commit 1f3ef78861ac. | |
5322 | */ | |
5323 | rbd_dev_header_unwatch_sync(rbd_dev); | |
3abef3b3 AE |
5324 | rbd_dev_image_release(rbd_dev); |
5325 | goto err_out_module; | |
5326 | } | |
5327 | ||
5328 | return count; | |
b536f69a | 5329 | |
c53d5893 AE |
5330 | err_out_rbd_dev: |
5331 | rbd_dev_destroy(rbd_dev); | |
bd4ba655 | 5332 | err_out_client: |
9d3997fd | 5333 | rbd_put_client(rbdc); |
0ddebc0c | 5334 | err_out_args: |
859c31df | 5335 | rbd_spec_put(spec); |
bd4ba655 AE |
5336 | err_out_module: |
5337 | module_put(THIS_MODULE); | |
27cc2594 | 5338 | |
602adf40 | 5339 | dout("Error adding device %s\n", buf); |
27cc2594 | 5340 | |
c0cd10db | 5341 | return (ssize_t)rc; |
602adf40 YS |
5342 | } |
5343 | ||
9b60e70b ID |
5344 | static ssize_t rbd_add(struct bus_type *bus, |
5345 | const char *buf, | |
5346 | size_t count) | |
5347 | { | |
5348 | if (single_major) | |
5349 | return -EINVAL; | |
5350 | ||
5351 | return do_rbd_add(bus, buf, count); | |
5352 | } | |
5353 | ||
5354 | static ssize_t rbd_add_single_major(struct bus_type *bus, | |
5355 | const char *buf, | |
5356 | size_t count) | |
5357 | { | |
5358 | return do_rbd_add(bus, buf, count); | |
5359 | } | |
5360 | ||
200a6a8b | 5361 | static void rbd_dev_device_release(struct device *dev) |
602adf40 | 5362 | { |
593a9e7b | 5363 | struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
602adf40 | 5364 | |
bc1ecc65 | 5365 | destroy_workqueue(rbd_dev->rq_wq); |
602adf40 | 5366 | rbd_free_disk(rbd_dev); |
200a6a8b | 5367 | clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
6d80b130 | 5368 | rbd_dev_mapping_clear(rbd_dev); |
9b60e70b ID |
5369 | if (!single_major) |
5370 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
e2839308 | 5371 | rbd_dev_id_put(rbd_dev); |
d1cf5788 | 5372 | rbd_dev_mapping_clear(rbd_dev); |
602adf40 YS |
5373 | } |
5374 | ||
05a46afd AE |
5375 | static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
5376 | { | |
ad945fc1 | 5377 | while (rbd_dev->parent) { |
05a46afd AE |
5378 | struct rbd_device *first = rbd_dev; |
5379 | struct rbd_device *second = first->parent; | |
5380 | struct rbd_device *third; | |
5381 | ||
5382 | /* | |
5383 | * Follow to the parent with no grandparent and | |
5384 | * remove it. | |
5385 | */ | |
5386 | while (second && (third = second->parent)) { | |
5387 | first = second; | |
5388 | second = third; | |
5389 | } | |
ad945fc1 | 5390 | rbd_assert(second); |
8ad42cd0 | 5391 | rbd_dev_image_release(second); |
ad945fc1 AE |
5392 | first->parent = NULL; |
5393 | first->parent_overlap = 0; | |
5394 | ||
5395 | rbd_assert(first->parent_spec); | |
05a46afd AE |
5396 | rbd_spec_put(first->parent_spec); |
5397 | first->parent_spec = NULL; | |
05a46afd AE |
5398 | } |
5399 | } | |
5400 | ||
9b60e70b ID |
5401 | static ssize_t do_rbd_remove(struct bus_type *bus, |
5402 | const char *buf, | |
5403 | size_t count) | |
602adf40 YS |
5404 | { |
5405 | struct rbd_device *rbd_dev = NULL; | |
751cc0e3 AE |
5406 | struct list_head *tmp; |
5407 | int dev_id; | |
602adf40 | 5408 | unsigned long ul; |
82a442d2 | 5409 | bool already = false; |
0d8189e1 | 5410 | int ret; |
602adf40 | 5411 | |
bb8e0e84 | 5412 | ret = kstrtoul(buf, 10, &ul); |
0d8189e1 AE |
5413 | if (ret) |
5414 | return ret; | |
602adf40 YS |
5415 | |
5416 | /* convert to int; abort if we lost anything in the conversion */ | |
751cc0e3 AE |
5417 | dev_id = (int)ul; |
5418 | if (dev_id != ul) | |
602adf40 YS |
5419 | return -EINVAL; |
5420 | ||
751cc0e3 AE |
5421 | ret = -ENOENT; |
5422 | spin_lock(&rbd_dev_list_lock); | |
5423 | list_for_each(tmp, &rbd_dev_list) { | |
5424 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
5425 | if (rbd_dev->dev_id == dev_id) { | |
5426 | ret = 0; | |
5427 | break; | |
5428 | } | |
42382b70 | 5429 | } |
751cc0e3 AE |
5430 | if (!ret) { |
5431 | spin_lock_irq(&rbd_dev->lock); | |
5432 | if (rbd_dev->open_count) | |
5433 | ret = -EBUSY; | |
5434 | else | |
82a442d2 AE |
5435 | already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
5436 | &rbd_dev->flags); | |
751cc0e3 AE |
5437 | spin_unlock_irq(&rbd_dev->lock); |
5438 | } | |
5439 | spin_unlock(&rbd_dev_list_lock); | |
82a442d2 | 5440 | if (ret < 0 || already) |
1ba0f1e7 | 5441 | return ret; |
751cc0e3 | 5442 | |
fca27065 | 5443 | rbd_dev_header_unwatch_sync(rbd_dev); |
9abc5990 JD |
5444 | /* |
5445 | * flush remaining watch callbacks - these must be complete | |
5446 | * before the osd_client is shutdown | |
5447 | */ | |
5448 | dout("%s: flushing notifies", __func__); | |
5449 | ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); | |
fca27065 | 5450 | |
9875201e JD |
5451 | /* |
5452 | * Don't free anything from rbd_dev->disk until after all | |
5453 | * notifies are completely processed. Otherwise | |
5454 | * rbd_bus_del_dev() will race with rbd_watch_cb(), resulting | |
5455 | * in a potential use after free of rbd_dev->disk or rbd_dev. | |
5456 | */ | |
5457 | rbd_bus_del_dev(rbd_dev); | |
8ad42cd0 | 5458 | rbd_dev_image_release(rbd_dev); |
79ab7558 | 5459 | module_put(THIS_MODULE); |
aafb230e | 5460 | |
1ba0f1e7 | 5461 | return count; |
602adf40 YS |
5462 | } |
5463 | ||
9b60e70b ID |
5464 | static ssize_t rbd_remove(struct bus_type *bus, |
5465 | const char *buf, | |
5466 | size_t count) | |
5467 | { | |
5468 | if (single_major) | |
5469 | return -EINVAL; | |
5470 | ||
5471 | return do_rbd_remove(bus, buf, count); | |
5472 | } | |
5473 | ||
5474 | static ssize_t rbd_remove_single_major(struct bus_type *bus, | |
5475 | const char *buf, | |
5476 | size_t count) | |
5477 | { | |
5478 | return do_rbd_remove(bus, buf, count); | |
5479 | } | |
5480 | ||
602adf40 YS |
5481 | /* |
5482 | * create control files in sysfs | |
dfc5606d | 5483 | * /sys/bus/rbd/... |
602adf40 YS |
5484 | */ |
5485 | static int rbd_sysfs_init(void) | |
5486 | { | |
dfc5606d | 5487 | int ret; |
602adf40 | 5488 | |
fed4c143 | 5489 | ret = device_register(&rbd_root_dev); |
21079786 | 5490 | if (ret < 0) |
dfc5606d | 5491 | return ret; |
602adf40 | 5492 | |
fed4c143 AE |
5493 | ret = bus_register(&rbd_bus_type); |
5494 | if (ret < 0) | |
5495 | device_unregister(&rbd_root_dev); | |
602adf40 | 5496 | |
602adf40 YS |
5497 | return ret; |
5498 | } | |
5499 | ||
5500 | static void rbd_sysfs_cleanup(void) | |
5501 | { | |
dfc5606d | 5502 | bus_unregister(&rbd_bus_type); |
fed4c143 | 5503 | device_unregister(&rbd_root_dev); |
602adf40 YS |
5504 | } |
5505 | ||
1c2a9dfe AE |
5506 | static int rbd_slab_init(void) |
5507 | { | |
5508 | rbd_assert(!rbd_img_request_cache); | |
5509 | rbd_img_request_cache = kmem_cache_create("rbd_img_request", | |
5510 | sizeof (struct rbd_img_request), | |
5511 | __alignof__(struct rbd_img_request), | |
5512 | 0, NULL); | |
868311b1 AE |
5513 | if (!rbd_img_request_cache) |
5514 | return -ENOMEM; | |
5515 | ||
5516 | rbd_assert(!rbd_obj_request_cache); | |
5517 | rbd_obj_request_cache = kmem_cache_create("rbd_obj_request", | |
5518 | sizeof (struct rbd_obj_request), | |
5519 | __alignof__(struct rbd_obj_request), | |
5520 | 0, NULL); | |
78c2a44a AE |
5521 | if (!rbd_obj_request_cache) |
5522 | goto out_err; | |
5523 | ||
5524 | rbd_assert(!rbd_segment_name_cache); | |
5525 | rbd_segment_name_cache = kmem_cache_create("rbd_segment_name", | |
2d0ebc5d | 5526 | CEPH_MAX_OID_NAME_LEN + 1, 1, 0, NULL); |
78c2a44a | 5527 | if (rbd_segment_name_cache) |
1c2a9dfe | 5528 | return 0; |
78c2a44a AE |
5529 | out_err: |
5530 | if (rbd_obj_request_cache) { | |
5531 | kmem_cache_destroy(rbd_obj_request_cache); | |
5532 | rbd_obj_request_cache = NULL; | |
5533 | } | |
1c2a9dfe | 5534 | |
868311b1 AE |
5535 | kmem_cache_destroy(rbd_img_request_cache); |
5536 | rbd_img_request_cache = NULL; | |
5537 | ||
1c2a9dfe AE |
5538 | return -ENOMEM; |
5539 | } | |
5540 | ||
5541 | static void rbd_slab_exit(void) | |
5542 | { | |
78c2a44a AE |
5543 | rbd_assert(rbd_segment_name_cache); |
5544 | kmem_cache_destroy(rbd_segment_name_cache); | |
5545 | rbd_segment_name_cache = NULL; | |
5546 | ||
868311b1 AE |
5547 | rbd_assert(rbd_obj_request_cache); |
5548 | kmem_cache_destroy(rbd_obj_request_cache); | |
5549 | rbd_obj_request_cache = NULL; | |
5550 | ||
1c2a9dfe AE |
5551 | rbd_assert(rbd_img_request_cache); |
5552 | kmem_cache_destroy(rbd_img_request_cache); | |
5553 | rbd_img_request_cache = NULL; | |
5554 | } | |
5555 | ||
cc344fa1 | 5556 | static int __init rbd_init(void) |
602adf40 YS |
5557 | { |
5558 | int rc; | |
5559 | ||
1e32d34c AE |
5560 | if (!libceph_compatible(NULL)) { |
5561 | rbd_warn(NULL, "libceph incompatibility (quitting)"); | |
1e32d34c AE |
5562 | return -EINVAL; |
5563 | } | |
e1b4d96d | 5564 | |
1c2a9dfe | 5565 | rc = rbd_slab_init(); |
602adf40 YS |
5566 | if (rc) |
5567 | return rc; | |
e1b4d96d | 5568 | |
9b60e70b ID |
5569 | if (single_major) { |
5570 | rbd_major = register_blkdev(0, RBD_DRV_NAME); | |
5571 | if (rbd_major < 0) { | |
5572 | rc = rbd_major; | |
5573 | goto err_out_slab; | |
5574 | } | |
5575 | } | |
5576 | ||
1c2a9dfe AE |
5577 | rc = rbd_sysfs_init(); |
5578 | if (rc) | |
9b60e70b ID |
5579 | goto err_out_blkdev; |
5580 | ||
5581 | if (single_major) | |
5582 | pr_info("loaded (major %d)\n", rbd_major); | |
5583 | else | |
5584 | pr_info("loaded\n"); | |
1c2a9dfe | 5585 | |
e1b4d96d ID |
5586 | return 0; |
5587 | ||
9b60e70b ID |
5588 | err_out_blkdev: |
5589 | if (single_major) | |
5590 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
e1b4d96d ID |
5591 | err_out_slab: |
5592 | rbd_slab_exit(); | |
1c2a9dfe | 5593 | return rc; |
602adf40 YS |
5594 | } |
5595 | ||
cc344fa1 | 5596 | static void __exit rbd_exit(void) |
602adf40 | 5597 | { |
ffe312cf | 5598 | ida_destroy(&rbd_dev_id_ida); |
602adf40 | 5599 | rbd_sysfs_cleanup(); |
9b60e70b ID |
5600 | if (single_major) |
5601 | unregister_blkdev(rbd_major, RBD_DRV_NAME); | |
1c2a9dfe | 5602 | rbd_slab_exit(); |
602adf40 YS |
5603 | } |
5604 | ||
5605 | module_init(rbd_init); | |
5606 | module_exit(rbd_exit); | |
5607 | ||
d552c619 | 5608 | MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
602adf40 YS |
5609 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
5610 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
602adf40 YS |
5611 | /* following authorship retained from original osdblk.c */ |
5612 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
5613 | ||
90da258b | 5614 | MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
602adf40 | 5615 | MODULE_LICENSE("GPL"); |