2 rbd.c -- Export ceph rados objects as a Linux block device
5 based on drivers/block/osdblk.c:
7 Copyright 2009 Red Hat, Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; see the file COPYING. If not, write to
20 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 For usage instructions, please refer to:
26 Documentation/ABI/testing/sysfs-bus-rbd
30 #include <linux/ceph/libceph.h>
31 #include <linux/ceph/osd_client.h>
32 #include <linux/ceph/mon_client.h>
33 #include <linux/ceph/decode.h>
34 #include <linux/parser.h>
36 #include <linux/kernel.h>
37 #include <linux/device.h>
38 #include <linux/module.h>
40 #include <linux/blkdev.h>
42 #include "rbd_types.h"
44 #define RBD_DEBUG /* Activate rbd_assert() calls */
47 * The basic unit of block I/O is a sector. It is interpreted in a
48 * number of contexts in Linux (blk, bio, genhd), but the default is
49 * universally 512 bytes. These symbols are just slightly more
50 * meaningful than the bare numbers they represent.
52 #define SECTOR_SHIFT 9
53 #define SECTOR_SIZE (1ULL << SECTOR_SHIFT)
55 /* It might be useful to have these defined elsewhere */
57 #define U8_MAX ((u8) (~0U))
58 #define U16_MAX ((u16) (~0U))
59 #define U32_MAX ((u32) (~0U))
60 #define U64_MAX ((u64) (~0ULL))
62 #define RBD_DRV_NAME "rbd"
63 #define RBD_DRV_NAME_LONG "rbd (rados block device)"
65 #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */
67 #define RBD_SNAP_DEV_NAME_PREFIX "snap_"
68 #define RBD_MAX_SNAP_NAME_LEN \
69 (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
71 #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */
73 #define RBD_SNAP_HEAD_NAME "-"
75 /* This allows a single page to hold an image name sent by OSD */
76 #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
77 #define RBD_IMAGE_ID_LEN_MAX 64
79 #define RBD_OBJ_PREFIX_LEN_MAX 64
83 #define RBD_FEATURE_LAYERING 1
85 /* Features supported by this (client software) implementation. */
87 #define RBD_FEATURES_ALL (0)
90 * An RBD device name will be "rbd#", where the "rbd" comes from
91 * RBD_DRV_NAME above, and # is a unique integer identifier.
92 * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
93 * enough to hold all possible device names.
95 #define DEV_NAME_LEN 32
96 #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
99 * block device image metadata (in-memory version)
101 struct rbd_image_header
{
102 /* These four fields never change for a given rbd image */
109 /* The remaining fields need to be updated occasionally */
111 struct ceph_snap_context
*snapc
;
119 * An rbd image specification.
121 * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
122 * identify an image. Each rbd_dev structure includes a pointer to
123 * an rbd_spec structure that encapsulates this identity.
125 * Each of the id's in an rbd_spec has an associated name. For a
126 * user-mapped image, the names are supplied and the id's associated
127 * with them are looked up. For a layered image, a parent image is
128 * defined by the tuple, and the names are looked up.
130 * An rbd_dev structure contains a parent_spec pointer which is
131 * non-null if the image it represents is a child in a layered
132 * image. This pointer will refer to the rbd_spec structure used
133 * by the parent rbd_dev for its own identity (i.e., the structure
134 * is shared between the parent and child).
136 * Since these structures are populated once, during the discovery
137 * phase of image construction, they are effectively immutable so
138 * we make no effort to synchronize access to them.
140 * Note that code herein does not assume the image name is known (it
141 * could be a null pointer).
157 * an instance of the client. multiple devices may share an rbd client.
160 struct ceph_client
*client
;
162 struct list_head node
;
165 struct rbd_img_request
;
166 typedef void (*rbd_img_callback_t
)(struct rbd_img_request
*);
168 #define BAD_WHICH U32_MAX /* Good which or bad which, which? */
170 struct rbd_obj_request
;
171 typedef void (*rbd_obj_callback_t
)(struct rbd_obj_request
*);
173 enum obj_request_type
{
174 OBJ_REQUEST_NODATA
, OBJ_REQUEST_BIO
, OBJ_REQUEST_PAGES
177 struct rbd_obj_request
{
178 const char *object_name
;
179 u64 offset
; /* object start byte */
180 u64 length
; /* bytes from offset */
182 struct rbd_img_request
*img_request
;
183 struct list_head links
; /* img_request->obj_requests */
184 u32 which
; /* posn image request list */
186 enum obj_request_type type
;
188 struct bio
*bio_list
;
195 struct ceph_osd_request
*osd_req
;
197 u64 xferred
; /* bytes transferred */
202 rbd_obj_callback_t callback
;
203 struct completion completion
;
208 struct rbd_img_request
{
210 struct rbd_device
*rbd_dev
;
211 u64 offset
; /* starting image byte offset */
212 u64 length
; /* byte count from offset */
213 bool write_request
; /* false for read */
215 struct ceph_snap_context
*snapc
; /* for writes */
216 u64 snap_id
; /* for reads */
218 spinlock_t completion_lock
;/* protects next_completion */
220 rbd_img_callback_t callback
;
222 u32 obj_request_count
;
223 struct list_head obj_requests
; /* rbd_obj_request structs */
228 #define for_each_obj_request(ireq, oreq) \
229 list_for_each_entry(oreq, &(ireq)->obj_requests, links)
230 #define for_each_obj_request_from(ireq, oreq) \
231 list_for_each_entry_from(oreq, &(ireq)->obj_requests, links)
232 #define for_each_obj_request_safe(ireq, oreq, n) \
233 list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
239 struct list_head node
;
254 int dev_id
; /* blkdev unique id */
256 int major
; /* blkdev assigned major */
257 struct gendisk
*disk
; /* blkdev's gendisk and rq */
259 u32 image_format
; /* Either 1 or 2 */
260 struct rbd_client
*rbd_client
;
262 char name
[DEV_NAME_LEN
]; /* blkdev name, e.g. rbd3 */
264 spinlock_t lock
; /* queue, flags, open_count */
266 struct rbd_image_header header
;
267 unsigned long flags
; /* possibly lock protected */
268 struct rbd_spec
*spec
;
272 struct ceph_file_layout layout
;
274 struct ceph_osd_event
*watch_event
;
275 struct rbd_obj_request
*watch_request
;
277 struct rbd_spec
*parent_spec
;
280 /* protects updating the header */
281 struct rw_semaphore header_rwsem
;
283 struct rbd_mapping mapping
;
285 struct list_head node
;
287 /* list of snapshots */
288 struct list_head snaps
;
292 unsigned long open_count
; /* protected by lock */
296 * Flag bits for rbd_dev->flags. If atomicity is required,
297 * rbd_dev->lock is used to protect access.
299 * Currently, only the "removing" flag (which is coupled with the
300 * "open_count" field) requires atomic access.
303 RBD_DEV_FLAG_EXISTS
, /* mapped snapshot has not been deleted */
304 RBD_DEV_FLAG_REMOVING
, /* this mapping is being removed */
307 static DEFINE_MUTEX(ctl_mutex
); /* Serialize open/close/setup/teardown */
309 static LIST_HEAD(rbd_dev_list
); /* devices */
310 static DEFINE_SPINLOCK(rbd_dev_list_lock
);
312 static LIST_HEAD(rbd_client_list
); /* clients */
313 static DEFINE_SPINLOCK(rbd_client_list_lock
);
315 static int rbd_dev_snaps_update(struct rbd_device
*rbd_dev
);
316 static int rbd_dev_snaps_register(struct rbd_device
*rbd_dev
);
318 static void rbd_dev_release(struct device
*dev
);
319 static void rbd_remove_snap_dev(struct rbd_snap
*snap
);
321 static ssize_t
rbd_add(struct bus_type
*bus
, const char *buf
,
323 static ssize_t
rbd_remove(struct bus_type
*bus
, const char *buf
,
326 static struct bus_attribute rbd_bus_attrs
[] = {
327 __ATTR(add
, S_IWUSR
, NULL
, rbd_add
),
328 __ATTR(remove
, S_IWUSR
, NULL
, rbd_remove
),
332 static struct bus_type rbd_bus_type
= {
334 .bus_attrs
= rbd_bus_attrs
,
337 static void rbd_root_dev_release(struct device
*dev
)
341 static struct device rbd_root_dev
= {
343 .release
= rbd_root_dev_release
,
346 static __printf(2, 3)
347 void rbd_warn(struct rbd_device
*rbd_dev
, const char *fmt
, ...)
349 struct va_format vaf
;
357 printk(KERN_WARNING
"%s: %pV\n", RBD_DRV_NAME
, &vaf
);
358 else if (rbd_dev
->disk
)
359 printk(KERN_WARNING
"%s: %s: %pV\n",
360 RBD_DRV_NAME
, rbd_dev
->disk
->disk_name
, &vaf
);
361 else if (rbd_dev
->spec
&& rbd_dev
->spec
->image_name
)
362 printk(KERN_WARNING
"%s: image %s: %pV\n",
363 RBD_DRV_NAME
, rbd_dev
->spec
->image_name
, &vaf
);
364 else if (rbd_dev
->spec
&& rbd_dev
->spec
->image_id
)
365 printk(KERN_WARNING
"%s: id %s: %pV\n",
366 RBD_DRV_NAME
, rbd_dev
->spec
->image_id
, &vaf
);
368 printk(KERN_WARNING
"%s: rbd_dev %p: %pV\n",
369 RBD_DRV_NAME
, rbd_dev
, &vaf
);
374 #define rbd_assert(expr) \
375 if (unlikely(!(expr))) { \
376 printk(KERN_ERR "\nAssertion failure in %s() " \
378 "\trbd_assert(%s);\n\n", \
379 __func__, __LINE__, #expr); \
382 #else /* !RBD_DEBUG */
383 # define rbd_assert(expr) ((void) 0)
384 #endif /* !RBD_DEBUG */
386 static int rbd_dev_refresh(struct rbd_device
*rbd_dev
, u64
*hver
);
387 static int rbd_dev_v2_refresh(struct rbd_device
*rbd_dev
, u64
*hver
);
389 static int rbd_open(struct block_device
*bdev
, fmode_t mode
)
391 struct rbd_device
*rbd_dev
= bdev
->bd_disk
->private_data
;
392 bool removing
= false;
394 if ((mode
& FMODE_WRITE
) && rbd_dev
->mapping
.read_only
)
397 spin_lock_irq(&rbd_dev
->lock
);
398 if (test_bit(RBD_DEV_FLAG_REMOVING
, &rbd_dev
->flags
))
401 rbd_dev
->open_count
++;
402 spin_unlock_irq(&rbd_dev
->lock
);
406 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
407 (void) get_device(&rbd_dev
->dev
);
408 set_device_ro(bdev
, rbd_dev
->mapping
.read_only
);
409 mutex_unlock(&ctl_mutex
);
414 static int rbd_release(struct gendisk
*disk
, fmode_t mode
)
416 struct rbd_device
*rbd_dev
= disk
->private_data
;
417 unsigned long open_count_before
;
419 spin_lock_irq(&rbd_dev
->lock
);
420 open_count_before
= rbd_dev
->open_count
--;
421 spin_unlock_irq(&rbd_dev
->lock
);
422 rbd_assert(open_count_before
> 0);
424 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
425 put_device(&rbd_dev
->dev
);
426 mutex_unlock(&ctl_mutex
);
431 static const struct block_device_operations rbd_bd_ops
= {
432 .owner
= THIS_MODULE
,
434 .release
= rbd_release
,
438 * Initialize an rbd client instance.
441 static struct rbd_client
*rbd_client_create(struct ceph_options
*ceph_opts
)
443 struct rbd_client
*rbdc
;
446 dout("rbd_client_create\n");
447 rbdc
= kmalloc(sizeof(struct rbd_client
), GFP_KERNEL
);
451 kref_init(&rbdc
->kref
);
452 INIT_LIST_HEAD(&rbdc
->node
);
454 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
456 rbdc
->client
= ceph_create_client(ceph_opts
, rbdc
, 0, 0);
457 if (IS_ERR(rbdc
->client
))
459 ceph_opts
= NULL
; /* Now rbdc->client is responsible for ceph_opts */
461 ret
= ceph_open_session(rbdc
->client
);
465 spin_lock(&rbd_client_list_lock
);
466 list_add_tail(&rbdc
->node
, &rbd_client_list
);
467 spin_unlock(&rbd_client_list_lock
);
469 mutex_unlock(&ctl_mutex
);
471 dout("rbd_client_create created %p\n", rbdc
);
475 ceph_destroy_client(rbdc
->client
);
477 mutex_unlock(&ctl_mutex
);
481 ceph_destroy_options(ceph_opts
);
486 * Find a ceph client with specific addr and configuration. If
487 * found, bump its reference count.
489 static struct rbd_client
*rbd_client_find(struct ceph_options
*ceph_opts
)
491 struct rbd_client
*client_node
;
494 if (ceph_opts
->flags
& CEPH_OPT_NOSHARE
)
497 spin_lock(&rbd_client_list_lock
);
498 list_for_each_entry(client_node
, &rbd_client_list
, node
) {
499 if (!ceph_compare_options(ceph_opts
, client_node
->client
)) {
500 kref_get(&client_node
->kref
);
505 spin_unlock(&rbd_client_list_lock
);
507 return found
? client_node
: NULL
;
517 /* string args above */
520 /* Boolean args above */
524 static match_table_t rbd_opts_tokens
= {
526 /* string args above */
527 {Opt_read_only
, "read_only"},
528 {Opt_read_only
, "ro"}, /* Alternate spelling */
529 {Opt_read_write
, "read_write"},
530 {Opt_read_write
, "rw"}, /* Alternate spelling */
531 /* Boolean args above */
539 #define RBD_READ_ONLY_DEFAULT false
541 static int parse_rbd_opts_token(char *c
, void *private)
543 struct rbd_options
*rbd_opts
= private;
544 substring_t argstr
[MAX_OPT_ARGS
];
545 int token
, intval
, ret
;
547 token
= match_token(c
, rbd_opts_tokens
, argstr
);
551 if (token
< Opt_last_int
) {
552 ret
= match_int(&argstr
[0], &intval
);
554 pr_err("bad mount option arg (not int) "
558 dout("got int token %d val %d\n", token
, intval
);
559 } else if (token
> Opt_last_int
&& token
< Opt_last_string
) {
560 dout("got string token %d val %s\n", token
,
562 } else if (token
> Opt_last_string
&& token
< Opt_last_bool
) {
563 dout("got Boolean token %d\n", token
);
565 dout("got token %d\n", token
);
570 rbd_opts
->read_only
= true;
573 rbd_opts
->read_only
= false;
583 * Get a ceph client with specific addr and configuration, if one does
584 * not exist create it.
586 static struct rbd_client
*rbd_get_client(struct ceph_options
*ceph_opts
)
588 struct rbd_client
*rbdc
;
590 rbdc
= rbd_client_find(ceph_opts
);
591 if (rbdc
) /* using an existing client */
592 ceph_destroy_options(ceph_opts
);
594 rbdc
= rbd_client_create(ceph_opts
);
600 * Destroy ceph client
602 * Caller must hold rbd_client_list_lock.
604 static void rbd_client_release(struct kref
*kref
)
606 struct rbd_client
*rbdc
= container_of(kref
, struct rbd_client
, kref
);
608 dout("rbd_release_client %p\n", rbdc
);
609 spin_lock(&rbd_client_list_lock
);
610 list_del(&rbdc
->node
);
611 spin_unlock(&rbd_client_list_lock
);
613 ceph_destroy_client(rbdc
->client
);
618 * Drop reference to ceph client node. If it's not referenced anymore, release
621 static void rbd_put_client(struct rbd_client
*rbdc
)
624 kref_put(&rbdc
->kref
, rbd_client_release
);
627 static bool rbd_image_format_valid(u32 image_format
)
629 return image_format
== 1 || image_format
== 2;
632 static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk
*ondisk
)
637 /* The header has to start with the magic rbd header text */
638 if (memcmp(&ondisk
->text
, RBD_HEADER_TEXT
, sizeof (RBD_HEADER_TEXT
)))
641 /* The bio layer requires at least sector-sized I/O */
643 if (ondisk
->options
.order
< SECTOR_SHIFT
)
646 /* If we use u64 in a few spots we may be able to loosen this */
648 if (ondisk
->options
.order
> 8 * sizeof (int) - 1)
652 * The size of a snapshot header has to fit in a size_t, and
653 * that limits the number of snapshots.
655 snap_count
= le32_to_cpu(ondisk
->snap_count
);
656 size
= SIZE_MAX
- sizeof (struct ceph_snap_context
);
657 if (snap_count
> size
/ sizeof (__le64
))
661 * Not only that, but the size of the entire the snapshot
662 * header must also be representable in a size_t.
664 size
-= snap_count
* sizeof (__le64
);
665 if ((u64
) size
< le64_to_cpu(ondisk
->snap_names_len
))
672 * Create a new header structure, translate header format from the on-disk
675 static int rbd_header_from_disk(struct rbd_image_header
*header
,
676 struct rbd_image_header_ondisk
*ondisk
)
683 memset(header
, 0, sizeof (*header
));
685 snap_count
= le32_to_cpu(ondisk
->snap_count
);
687 len
= strnlen(ondisk
->object_prefix
, sizeof (ondisk
->object_prefix
));
688 header
->object_prefix
= kmalloc(len
+ 1, GFP_KERNEL
);
689 if (!header
->object_prefix
)
691 memcpy(header
->object_prefix
, ondisk
->object_prefix
, len
);
692 header
->object_prefix
[len
] = '\0';
695 u64 snap_names_len
= le64_to_cpu(ondisk
->snap_names_len
);
697 /* Save a copy of the snapshot names */
699 if (snap_names_len
> (u64
) SIZE_MAX
)
701 header
->snap_names
= kmalloc(snap_names_len
, GFP_KERNEL
);
702 if (!header
->snap_names
)
705 * Note that rbd_dev_v1_header_read() guarantees
706 * the ondisk buffer we're working with has
707 * snap_names_len bytes beyond the end of the
708 * snapshot id array, this memcpy() is safe.
710 memcpy(header
->snap_names
, &ondisk
->snaps
[snap_count
],
713 /* Record each snapshot's size */
715 size
= snap_count
* sizeof (*header
->snap_sizes
);
716 header
->snap_sizes
= kmalloc(size
, GFP_KERNEL
);
717 if (!header
->snap_sizes
)
719 for (i
= 0; i
< snap_count
; i
++)
720 header
->snap_sizes
[i
] =
721 le64_to_cpu(ondisk
->snaps
[i
].image_size
);
723 WARN_ON(ondisk
->snap_names_len
);
724 header
->snap_names
= NULL
;
725 header
->snap_sizes
= NULL
;
728 header
->features
= 0; /* No features support in v1 images */
729 header
->obj_order
= ondisk
->options
.order
;
730 header
->crypt_type
= ondisk
->options
.crypt_type
;
731 header
->comp_type
= ondisk
->options
.comp_type
;
733 /* Allocate and fill in the snapshot context */
735 header
->image_size
= le64_to_cpu(ondisk
->image_size
);
736 size
= sizeof (struct ceph_snap_context
);
737 size
+= snap_count
* sizeof (header
->snapc
->snaps
[0]);
738 header
->snapc
= kzalloc(size
, GFP_KERNEL
);
742 atomic_set(&header
->snapc
->nref
, 1);
743 header
->snapc
->seq
= le64_to_cpu(ondisk
->snap_seq
);
744 header
->snapc
->num_snaps
= snap_count
;
745 for (i
= 0; i
< snap_count
; i
++)
746 header
->snapc
->snaps
[i
] =
747 le64_to_cpu(ondisk
->snaps
[i
].id
);
752 kfree(header
->snap_sizes
);
753 header
->snap_sizes
= NULL
;
754 kfree(header
->snap_names
);
755 header
->snap_names
= NULL
;
756 kfree(header
->object_prefix
);
757 header
->object_prefix
= NULL
;
762 static const char *rbd_snap_name(struct rbd_device
*rbd_dev
, u64 snap_id
)
764 struct rbd_snap
*snap
;
766 if (snap_id
== CEPH_NOSNAP
)
767 return RBD_SNAP_HEAD_NAME
;
769 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
)
770 if (snap_id
== snap
->id
)
776 static int snap_by_name(struct rbd_device
*rbd_dev
, const char *snap_name
)
779 struct rbd_snap
*snap
;
781 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
) {
782 if (!strcmp(snap_name
, snap
->name
)) {
783 rbd_dev
->spec
->snap_id
= snap
->id
;
784 rbd_dev
->mapping
.size
= snap
->size
;
785 rbd_dev
->mapping
.features
= snap
->features
;
794 static int rbd_dev_set_mapping(struct rbd_device
*rbd_dev
)
798 if (!memcmp(rbd_dev
->spec
->snap_name
, RBD_SNAP_HEAD_NAME
,
799 sizeof (RBD_SNAP_HEAD_NAME
))) {
800 rbd_dev
->spec
->snap_id
= CEPH_NOSNAP
;
801 rbd_dev
->mapping
.size
= rbd_dev
->header
.image_size
;
802 rbd_dev
->mapping
.features
= rbd_dev
->header
.features
;
805 ret
= snap_by_name(rbd_dev
, rbd_dev
->spec
->snap_name
);
808 rbd_dev
->mapping
.read_only
= true;
810 set_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
);
816 static void rbd_header_free(struct rbd_image_header
*header
)
818 kfree(header
->object_prefix
);
819 header
->object_prefix
= NULL
;
820 kfree(header
->snap_sizes
);
821 header
->snap_sizes
= NULL
;
822 kfree(header
->snap_names
);
823 header
->snap_names
= NULL
;
824 ceph_put_snap_context(header
->snapc
);
825 header
->snapc
= NULL
;
828 static const char *rbd_segment_name(struct rbd_device
*rbd_dev
, u64 offset
)
834 name
= kmalloc(MAX_OBJ_NAME_SIZE
+ 1, GFP_NOIO
);
837 segment
= offset
>> rbd_dev
->header
.obj_order
;
838 ret
= snprintf(name
, MAX_OBJ_NAME_SIZE
+ 1, "%s.%012llx",
839 rbd_dev
->header
.object_prefix
, segment
);
840 if (ret
< 0 || ret
> MAX_OBJ_NAME_SIZE
) {
841 pr_err("error formatting segment name for #%llu (%d)\n",
850 static u64
rbd_segment_offset(struct rbd_device
*rbd_dev
, u64 offset
)
852 u64 segment_size
= (u64
) 1 << rbd_dev
->header
.obj_order
;
854 return offset
& (segment_size
- 1);
857 static u64
rbd_segment_length(struct rbd_device
*rbd_dev
,
858 u64 offset
, u64 length
)
860 u64 segment_size
= (u64
) 1 << rbd_dev
->header
.obj_order
;
862 offset
&= segment_size
- 1;
864 rbd_assert(length
<= U64_MAX
- offset
);
865 if (offset
+ length
> segment_size
)
866 length
= segment_size
- offset
;
872 * returns the size of an object in the image
874 static u64
rbd_obj_bytes(struct rbd_image_header
*header
)
876 return 1 << header
->obj_order
;
883 static void bio_chain_put(struct bio
*chain
)
889 chain
= chain
->bi_next
;
895 * zeros a bio chain, starting at specific offset
897 static void zero_bio_chain(struct bio
*chain
, int start_ofs
)
906 bio_for_each_segment(bv
, chain
, i
) {
907 if (pos
+ bv
->bv_len
> start_ofs
) {
908 int remainder
= max(start_ofs
- pos
, 0);
909 buf
= bvec_kmap_irq(bv
, &flags
);
910 memset(buf
+ remainder
, 0,
911 bv
->bv_len
- remainder
);
912 bvec_kunmap_irq(buf
, &flags
);
917 chain
= chain
->bi_next
;
922 * Clone a portion of a bio, starting at the given byte offset
923 * and continuing for the number of bytes indicated.
925 static struct bio
*bio_clone_range(struct bio
*bio_src
,
934 unsigned short end_idx
;
938 /* Handle the easy case for the caller */
940 if (!offset
&& len
== bio_src
->bi_size
)
941 return bio_clone(bio_src
, gfpmask
);
943 if (WARN_ON_ONCE(!len
))
945 if (WARN_ON_ONCE(len
> bio_src
->bi_size
))
947 if (WARN_ON_ONCE(offset
> bio_src
->bi_size
- len
))
950 /* Find first affected segment... */
953 __bio_for_each_segment(bv
, bio_src
, idx
, 0) {
954 if (resid
< bv
->bv_len
)
960 /* ...and the last affected segment */
963 __bio_for_each_segment(bv
, bio_src
, end_idx
, idx
) {
964 if (resid
<= bv
->bv_len
)
968 vcnt
= end_idx
- idx
+ 1;
970 /* Build the clone */
972 bio
= bio_alloc(gfpmask
, (unsigned int) vcnt
);
974 return NULL
; /* ENOMEM */
976 bio
->bi_bdev
= bio_src
->bi_bdev
;
977 bio
->bi_sector
= bio_src
->bi_sector
+ (offset
>> SECTOR_SHIFT
);
978 bio
->bi_rw
= bio_src
->bi_rw
;
979 bio
->bi_flags
|= 1 << BIO_CLONED
;
982 * Copy over our part of the bio_vec, then update the first
983 * and last (or only) entries.
985 memcpy(&bio
->bi_io_vec
[0], &bio_src
->bi_io_vec
[idx
],
986 vcnt
* sizeof (struct bio_vec
));
987 bio
->bi_io_vec
[0].bv_offset
+= voff
;
989 bio
->bi_io_vec
[0].bv_len
-= voff
;
990 bio
->bi_io_vec
[vcnt
- 1].bv_len
= resid
;
992 bio
->bi_io_vec
[0].bv_len
= len
;
1003 * Clone a portion of a bio chain, starting at the given byte offset
1004 * into the first bio in the source chain and continuing for the
1005 * number of bytes indicated. The result is another bio chain of
1006 * exactly the given length, or a null pointer on error.
1008 * The bio_src and offset parameters are both in-out. On entry they
1009 * refer to the first source bio and the offset into that bio where
1010 * the start of data to be cloned is located.
1012 * On return, bio_src is updated to refer to the bio in the source
1013 * chain that contains first un-cloned byte, and *offset will
1014 * contain the offset of that byte within that bio.
1016 static struct bio
*bio_chain_clone_range(struct bio
**bio_src
,
1017 unsigned int *offset
,
1021 struct bio
*bi
= *bio_src
;
1022 unsigned int off
= *offset
;
1023 struct bio
*chain
= NULL
;
1026 /* Build up a chain of clone bios up to the limit */
1028 if (!bi
|| off
>= bi
->bi_size
|| !len
)
1029 return NULL
; /* Nothing to clone */
1033 unsigned int bi_size
;
1037 rbd_warn(NULL
, "bio_chain exhausted with %u left", len
);
1038 goto out_err
; /* EINVAL; ran out of bio's */
1040 bi_size
= min_t(unsigned int, bi
->bi_size
- off
, len
);
1041 bio
= bio_clone_range(bi
, off
, bi_size
, gfpmask
);
1043 goto out_err
; /* ENOMEM */
1046 end
= &bio
->bi_next
;
1049 if (off
== bi
->bi_size
) {
1060 bio_chain_put(chain
);
1065 static void rbd_obj_request_get(struct rbd_obj_request
*obj_request
)
1067 kref_get(&obj_request
->kref
);
1070 static void rbd_obj_request_destroy(struct kref
*kref
);
1071 static void rbd_obj_request_put(struct rbd_obj_request
*obj_request
)
1073 rbd_assert(obj_request
!= NULL
);
1074 kref_put(&obj_request
->kref
, rbd_obj_request_destroy
);
1077 static void rbd_img_request_get(struct rbd_img_request
*img_request
)
1079 kref_get(&img_request
->kref
);
1082 static void rbd_img_request_destroy(struct kref
*kref
);
1083 static void rbd_img_request_put(struct rbd_img_request
*img_request
)
1085 rbd_assert(img_request
!= NULL
);
1086 kref_put(&img_request
->kref
, rbd_img_request_destroy
);
1089 static inline void rbd_img_obj_request_add(struct rbd_img_request
*img_request
,
1090 struct rbd_obj_request
*obj_request
)
1092 rbd_assert(obj_request
->img_request
== NULL
);
1094 rbd_obj_request_get(obj_request
);
1095 obj_request
->img_request
= img_request
;
1096 obj_request
->which
= img_request
->obj_request_count
;
1097 rbd_assert(obj_request
->which
!= BAD_WHICH
);
1098 img_request
->obj_request_count
++;
1099 list_add_tail(&obj_request
->links
, &img_request
->obj_requests
);
1102 static inline void rbd_img_obj_request_del(struct rbd_img_request
*img_request
,
1103 struct rbd_obj_request
*obj_request
)
1105 rbd_assert(obj_request
->which
!= BAD_WHICH
);
1107 list_del(&obj_request
->links
);
1108 rbd_assert(img_request
->obj_request_count
> 0);
1109 img_request
->obj_request_count
--;
1110 rbd_assert(obj_request
->which
== img_request
->obj_request_count
);
1111 obj_request
->which
= BAD_WHICH
;
1112 rbd_assert(obj_request
->img_request
== img_request
);
1113 obj_request
->img_request
= NULL
;
1114 obj_request
->callback
= NULL
;
1115 rbd_obj_request_put(obj_request
);
1118 static bool obj_request_type_valid(enum obj_request_type type
)
1121 case OBJ_REQUEST_NODATA
:
1122 case OBJ_REQUEST_BIO
:
1123 case OBJ_REQUEST_PAGES
:
1130 struct ceph_osd_req_op
*rbd_osd_req_op_create(u16 opcode
, ...)
1132 struct ceph_osd_req_op
*op
;
1136 op
= kzalloc(sizeof (*op
), GFP_NOIO
);
1140 va_start(args
, opcode
);
1142 case CEPH_OSD_OP_READ
:
1143 case CEPH_OSD_OP_WRITE
:
1144 /* rbd_osd_req_op_create(READ, offset, length) */
1145 /* rbd_osd_req_op_create(WRITE, offset, length) */
1146 op
->extent
.offset
= va_arg(args
, u64
);
1147 op
->extent
.length
= va_arg(args
, u64
);
1148 if (opcode
== CEPH_OSD_OP_WRITE
)
1149 op
->payload_len
= op
->extent
.length
;
1151 case CEPH_OSD_OP_STAT
:
1153 case CEPH_OSD_OP_CALL
:
1154 /* rbd_osd_req_op_create(CALL, class, method, data, datalen) */
1155 op
->cls
.class_name
= va_arg(args
, char *);
1156 size
= strlen(op
->cls
.class_name
);
1157 rbd_assert(size
<= (size_t) U8_MAX
);
1158 op
->cls
.class_len
= size
;
1159 op
->payload_len
= size
;
1161 op
->cls
.method_name
= va_arg(args
, char *);
1162 size
= strlen(op
->cls
.method_name
);
1163 rbd_assert(size
<= (size_t) U8_MAX
);
1164 op
->cls
.method_len
= size
;
1165 op
->payload_len
+= size
;
1168 op
->cls
.indata
= va_arg(args
, void *);
1169 size
= va_arg(args
, size_t);
1170 rbd_assert(size
<= (size_t) U32_MAX
);
1171 op
->cls
.indata_len
= (u32
) size
;
1172 op
->payload_len
+= size
;
1174 case CEPH_OSD_OP_NOTIFY_ACK
:
1175 case CEPH_OSD_OP_WATCH
:
1176 /* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */
1177 /* rbd_osd_req_op_create(WATCH, cookie, version, flag) */
1178 op
->watch
.cookie
= va_arg(args
, u64
);
1179 op
->watch
.ver
= va_arg(args
, u64
);
1180 op
->watch
.ver
= cpu_to_le64(op
->watch
.ver
);
1181 if (opcode
== CEPH_OSD_OP_WATCH
&& va_arg(args
, int))
1182 op
->watch
.flag
= (u8
) 1;
1185 rbd_warn(NULL
, "unsupported opcode %hu\n", opcode
);
1195 static void rbd_osd_req_op_destroy(struct ceph_osd_req_op
*op
)
1200 static int rbd_obj_request_submit(struct ceph_osd_client
*osdc
,
1201 struct rbd_obj_request
*obj_request
)
1203 return ceph_osdc_start_request(osdc
, obj_request
->osd_req
, false);
1206 static void rbd_img_request_complete(struct rbd_img_request
*img_request
)
1208 if (img_request
->callback
)
1209 img_request
->callback(img_request
);
1211 rbd_img_request_put(img_request
);
1214 /* Caller is responsible for rbd_obj_request_destroy(obj_request) */
1216 static int rbd_obj_request_wait(struct rbd_obj_request
*obj_request
)
1218 return wait_for_completion_interruptible(&obj_request
->completion
);
1221 static void obj_request_done_init(struct rbd_obj_request
*obj_request
)
1223 atomic_set(&obj_request
->done
, 0);
1227 static void obj_request_done_set(struct rbd_obj_request
*obj_request
)
1229 atomic_set(&obj_request
->done
, 1);
1233 static bool obj_request_done_test(struct rbd_obj_request
*obj_request
)
1236 return atomic_read(&obj_request
->done
) != 0;
1239 static void rbd_osd_trivial_callback(struct rbd_obj_request
*obj_request
,
1240 struct ceph_osd_op
*op
)
1242 obj_request_done_set(obj_request
);
1245 static void rbd_obj_request_complete(struct rbd_obj_request
*obj_request
)
1247 if (obj_request
->callback
)
1248 obj_request
->callback(obj_request
);
1250 complete_all(&obj_request
->completion
);
1253 static void rbd_osd_read_callback(struct rbd_obj_request
*obj_request
,
1254 struct ceph_osd_op
*op
)
1259 * We support a 64-bit length, but ultimately it has to be
1260 * passed to blk_end_request(), which takes an unsigned int.
1262 xferred
= le64_to_cpu(op
->extent
.length
);
1263 rbd_assert(xferred
< (u64
) UINT_MAX
);
1264 if (obj_request
->result
== (s32
) -ENOENT
) {
1265 zero_bio_chain(obj_request
->bio_list
, 0);
1266 obj_request
->result
= 0;
1267 } else if (xferred
< obj_request
->length
&& !obj_request
->result
) {
1268 zero_bio_chain(obj_request
->bio_list
, xferred
);
1269 xferred
= obj_request
->length
;
1271 obj_request
->xferred
= xferred
;
1272 obj_request_done_set(obj_request
);
1275 static void rbd_osd_write_callback(struct rbd_obj_request
*obj_request
,
1276 struct ceph_osd_op
*op
)
1278 obj_request
->xferred
= le64_to_cpu(op
->extent
.length
);
1279 obj_request_done_set(obj_request
);
1283 * For a simple stat call there's nothing to do. We'll do more if
1284 * this is part of a write sequence for a layered image.
1286 static void rbd_osd_stat_callback(struct rbd_obj_request
*obj_request
,
1287 struct ceph_osd_op
*op
)
1289 obj_request_done_set(obj_request
);
1292 static void rbd_osd_req_callback(struct ceph_osd_request
*osd_req
,
1293 struct ceph_msg
*msg
)
1295 struct rbd_obj_request
*obj_request
= osd_req
->r_priv
;
1296 struct ceph_osd_reply_head
*reply_head
;
1297 struct ceph_osd_op
*op
;
1301 rbd_assert(osd_req
== obj_request
->osd_req
);
1302 rbd_assert(!!obj_request
->img_request
^
1303 (obj_request
->which
== BAD_WHICH
));
1305 obj_request
->xferred
= le32_to_cpu(msg
->hdr
.data_len
);
1306 reply_head
= msg
->front
.iov_base
;
1307 obj_request
->result
= (s32
) le32_to_cpu(reply_head
->result
);
1308 obj_request
->version
= le64_to_cpu(osd_req
->r_reassert_version
.version
);
1310 num_ops
= le32_to_cpu(reply_head
->num_ops
);
1311 WARN_ON(num_ops
!= 1); /* For now */
1313 op
= &reply_head
->ops
[0];
1314 opcode
= le16_to_cpu(op
->op
);
1316 case CEPH_OSD_OP_READ
:
1317 rbd_osd_read_callback(obj_request
, op
);
1319 case CEPH_OSD_OP_WRITE
:
1320 rbd_osd_write_callback(obj_request
, op
);
1322 case CEPH_OSD_OP_STAT
:
1323 rbd_osd_stat_callback(obj_request
, op
);
1325 case CEPH_OSD_OP_CALL
:
1326 case CEPH_OSD_OP_NOTIFY_ACK
:
1327 case CEPH_OSD_OP_WATCH
:
1328 rbd_osd_trivial_callback(obj_request
, op
);
1331 rbd_warn(NULL
, "%s: unsupported op %hu\n",
1332 obj_request
->object_name
, (unsigned short) opcode
);
1336 if (obj_request_done_test(obj_request
))
1337 rbd_obj_request_complete(obj_request
);
1340 static struct ceph_osd_request
*rbd_osd_req_create(
1341 struct rbd_device
*rbd_dev
,
1343 struct rbd_obj_request
*obj_request
,
1344 struct ceph_osd_req_op
*op
)
1346 struct rbd_img_request
*img_request
= obj_request
->img_request
;
1347 struct ceph_snap_context
*snapc
= NULL
;
1348 struct ceph_osd_client
*osdc
;
1349 struct ceph_osd_request
*osd_req
;
1350 struct timespec now
;
1351 struct timespec
*mtime
;
1352 u64 snap_id
= CEPH_NOSNAP
;
1353 u64 offset
= obj_request
->offset
;
1354 u64 length
= obj_request
->length
;
1357 rbd_assert(img_request
->write_request
== write_request
);
1358 if (img_request
->write_request
)
1359 snapc
= img_request
->snapc
;
1361 snap_id
= img_request
->snap_id
;
1364 /* Allocate and initialize the request, for the single op */
1366 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1367 osd_req
= ceph_osdc_alloc_request(osdc
, snapc
, 1, false, GFP_ATOMIC
);
1369 return NULL
; /* ENOMEM */
1371 rbd_assert(obj_request_type_valid(obj_request
->type
));
1372 switch (obj_request
->type
) {
1373 case OBJ_REQUEST_NODATA
:
1374 break; /* Nothing to do */
1375 case OBJ_REQUEST_BIO
:
1376 rbd_assert(obj_request
->bio_list
!= NULL
);
1377 osd_req
->r_bio
= obj_request
->bio_list
;
1379 case OBJ_REQUEST_PAGES
:
1380 osd_req
->r_pages
= obj_request
->pages
;
1381 osd_req
->r_num_pages
= obj_request
->page_count
;
1382 osd_req
->r_page_alignment
= offset
& ~PAGE_MASK
;
1386 if (write_request
) {
1387 osd_req
->r_flags
= CEPH_OSD_FLAG_WRITE
| CEPH_OSD_FLAG_ONDISK
;
1391 osd_req
->r_flags
= CEPH_OSD_FLAG_READ
;
1392 mtime
= NULL
; /* not needed for reads */
1393 offset
= 0; /* These are not used... */
1394 length
= 0; /* ...for osd read requests */
1397 osd_req
->r_callback
= rbd_osd_req_callback
;
1398 osd_req
->r_priv
= obj_request
;
1400 osd_req
->r_oid_len
= strlen(obj_request
->object_name
);
1401 rbd_assert(osd_req
->r_oid_len
< sizeof (osd_req
->r_oid
));
1402 memcpy(osd_req
->r_oid
, obj_request
->object_name
, osd_req
->r_oid_len
);
1404 osd_req
->r_file_layout
= rbd_dev
->layout
; /* struct */
1406 /* osd_req will get its own reference to snapc (if non-null) */
1408 ceph_osdc_build_request(osd_req
, offset
, length
, 1, op
,
1409 snapc
, snap_id
, mtime
);
1414 static void rbd_osd_req_destroy(struct ceph_osd_request
*osd_req
)
1416 ceph_osdc_put_request(osd_req
);
1419 /* object_name is assumed to be a non-null pointer and NUL-terminated */
1421 static struct rbd_obj_request
*rbd_obj_request_create(const char *object_name
,
1422 u64 offset
, u64 length
,
1423 enum obj_request_type type
)
1425 struct rbd_obj_request
*obj_request
;
1429 rbd_assert(obj_request_type_valid(type
));
1431 size
= strlen(object_name
) + 1;
1432 obj_request
= kzalloc(sizeof (*obj_request
) + size
, GFP_KERNEL
);
1436 name
= (char *)(obj_request
+ 1);
1437 obj_request
->object_name
= memcpy(name
, object_name
, size
);
1438 obj_request
->offset
= offset
;
1439 obj_request
->length
= length
;
1440 obj_request
->which
= BAD_WHICH
;
1441 obj_request
->type
= type
;
1442 INIT_LIST_HEAD(&obj_request
->links
);
1443 obj_request_done_init(obj_request
);
1444 init_completion(&obj_request
->completion
);
1445 kref_init(&obj_request
->kref
);
1450 static void rbd_obj_request_destroy(struct kref
*kref
)
1452 struct rbd_obj_request
*obj_request
;
1454 obj_request
= container_of(kref
, struct rbd_obj_request
, kref
);
1456 rbd_assert(obj_request
->img_request
== NULL
);
1457 rbd_assert(obj_request
->which
== BAD_WHICH
);
1459 if (obj_request
->osd_req
)
1460 rbd_osd_req_destroy(obj_request
->osd_req
);
1462 rbd_assert(obj_request_type_valid(obj_request
->type
));
1463 switch (obj_request
->type
) {
1464 case OBJ_REQUEST_NODATA
:
1465 break; /* Nothing to do */
1466 case OBJ_REQUEST_BIO
:
1467 if (obj_request
->bio_list
)
1468 bio_chain_put(obj_request
->bio_list
);
1470 case OBJ_REQUEST_PAGES
:
1471 if (obj_request
->pages
)
1472 ceph_release_page_vector(obj_request
->pages
,
1473 obj_request
->page_count
);
1481 * Caller is responsible for filling in the list of object requests
1482 * that comprises the image request, and the Linux request pointer
1483 * (if there is one).
1485 struct rbd_img_request
*rbd_img_request_create(struct rbd_device
*rbd_dev
,
1486 u64 offset
, u64 length
,
1489 struct rbd_img_request
*img_request
;
1490 struct ceph_snap_context
*snapc
= NULL
;
1492 img_request
= kmalloc(sizeof (*img_request
), GFP_ATOMIC
);
1496 if (write_request
) {
1497 down_read(&rbd_dev
->header_rwsem
);
1498 snapc
= ceph_get_snap_context(rbd_dev
->header
.snapc
);
1499 up_read(&rbd_dev
->header_rwsem
);
1500 if (WARN_ON(!snapc
)) {
1502 return NULL
; /* Shouldn't happen */
1506 img_request
->rq
= NULL
;
1507 img_request
->rbd_dev
= rbd_dev
;
1508 img_request
->offset
= offset
;
1509 img_request
->length
= length
;
1510 img_request
->write_request
= write_request
;
1512 img_request
->snapc
= snapc
;
1514 img_request
->snap_id
= rbd_dev
->spec
->snap_id
;
1515 spin_lock_init(&img_request
->completion_lock
);
1516 img_request
->next_completion
= 0;
1517 img_request
->callback
= NULL
;
1518 img_request
->obj_request_count
= 0;
1519 INIT_LIST_HEAD(&img_request
->obj_requests
);
1520 kref_init(&img_request
->kref
);
1522 rbd_img_request_get(img_request
); /* Avoid a warning */
1523 rbd_img_request_put(img_request
); /* TEMPORARY */
1528 static void rbd_img_request_destroy(struct kref
*kref
)
1530 struct rbd_img_request
*img_request
;
1531 struct rbd_obj_request
*obj_request
;
1532 struct rbd_obj_request
*next_obj_request
;
1534 img_request
= container_of(kref
, struct rbd_img_request
, kref
);
1536 for_each_obj_request_safe(img_request
, obj_request
, next_obj_request
)
1537 rbd_img_obj_request_del(img_request
, obj_request
);
1538 rbd_assert(img_request
->obj_request_count
== 0);
1540 if (img_request
->write_request
)
1541 ceph_put_snap_context(img_request
->snapc
);
1546 static int rbd_img_request_fill_bio(struct rbd_img_request
*img_request
,
1547 struct bio
*bio_list
)
1549 struct rbd_device
*rbd_dev
= img_request
->rbd_dev
;
1550 struct rbd_obj_request
*obj_request
= NULL
;
1551 struct rbd_obj_request
*next_obj_request
;
1552 unsigned int bio_offset
;
1557 opcode
= img_request
->write_request
? CEPH_OSD_OP_WRITE
1560 image_offset
= img_request
->offset
;
1561 rbd_assert(image_offset
== bio_list
->bi_sector
<< SECTOR_SHIFT
);
1562 resid
= img_request
->length
;
1564 const char *object_name
;
1565 unsigned int clone_size
;
1566 struct ceph_osd_req_op
*op
;
1570 object_name
= rbd_segment_name(rbd_dev
, image_offset
);
1573 offset
= rbd_segment_offset(rbd_dev
, image_offset
);
1574 length
= rbd_segment_length(rbd_dev
, image_offset
, resid
);
1575 obj_request
= rbd_obj_request_create(object_name
,
1578 kfree(object_name
); /* object request has its own copy */
1582 rbd_assert(length
<= (u64
) UINT_MAX
);
1583 clone_size
= (unsigned int) length
;
1584 obj_request
->bio_list
= bio_chain_clone_range(&bio_list
,
1585 &bio_offset
, clone_size
,
1587 if (!obj_request
->bio_list
)
1591 * Build up the op to use in building the osd
1592 * request. Note that the contents of the op are
1593 * copied by rbd_osd_req_create().
1595 op
= rbd_osd_req_op_create(opcode
, offset
, length
);
1598 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
,
1599 img_request
->write_request
,
1601 rbd_osd_req_op_destroy(op
);
1602 if (!obj_request
->osd_req
)
1604 /* status and version are initially zero-filled */
1606 rbd_img_obj_request_add(img_request
, obj_request
);
1608 image_offset
+= length
;
1615 rbd_obj_request_put(obj_request
);
1617 for_each_obj_request_safe(img_request
, obj_request
, next_obj_request
)
1618 rbd_obj_request_put(obj_request
);
1623 static void rbd_img_obj_callback(struct rbd_obj_request
*obj_request
)
1625 struct rbd_img_request
*img_request
;
1626 u32 which
= obj_request
->which
;
1629 img_request
= obj_request
->img_request
;
1630 rbd_assert(img_request
!= NULL
);
1631 rbd_assert(img_request
->rq
!= NULL
);
1632 rbd_assert(which
!= BAD_WHICH
);
1633 rbd_assert(which
< img_request
->obj_request_count
);
1634 rbd_assert(which
>= img_request
->next_completion
);
1636 spin_lock_irq(&img_request
->completion_lock
);
1637 if (which
!= img_request
->next_completion
)
1640 for_each_obj_request_from(img_request
, obj_request
) {
1641 unsigned int xferred
;
1645 rbd_assert(which
< img_request
->obj_request_count
);
1647 if (!obj_request_done_test(obj_request
))
1650 rbd_assert(obj_request
->xferred
<= (u64
) UINT_MAX
);
1651 xferred
= (unsigned int) obj_request
->xferred
;
1652 result
= (int) obj_request
->result
;
1654 rbd_warn(NULL
, "obj_request %s result %d xferred %u\n",
1655 img_request
->write_request
? "write" : "read",
1658 more
= blk_end_request(img_request
->rq
, result
, xferred
);
1661 rbd_assert(more
^ (which
== img_request
->obj_request_count
));
1662 img_request
->next_completion
= which
;
1664 spin_unlock_irq(&img_request
->completion_lock
);
1667 rbd_img_request_complete(img_request
);
1670 static int rbd_img_request_submit(struct rbd_img_request
*img_request
)
1672 struct rbd_device
*rbd_dev
= img_request
->rbd_dev
;
1673 struct ceph_osd_client
*osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1674 struct rbd_obj_request
*obj_request
;
1676 for_each_obj_request(img_request
, obj_request
) {
1679 obj_request
->callback
= rbd_img_obj_callback
;
1680 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1684 * The image request has its own reference to each
1685 * of its object requests, so we can safely drop the
1688 rbd_obj_request_put(obj_request
);
1694 static int rbd_obj_notify_ack(struct rbd_device
*rbd_dev
,
1695 u64 ver
, u64 notify_id
)
1697 struct rbd_obj_request
*obj_request
;
1698 struct ceph_osd_req_op
*op
;
1699 struct ceph_osd_client
*osdc
;
1702 obj_request
= rbd_obj_request_create(rbd_dev
->header_name
, 0, 0,
1703 OBJ_REQUEST_NODATA
);
1708 op
= rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK
, notify_id
, ver
);
1711 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false,
1713 rbd_osd_req_op_destroy(op
);
1714 if (!obj_request
->osd_req
)
1717 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1718 obj_request
->callback
= rbd_obj_request_put
;
1719 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1722 rbd_obj_request_put(obj_request
);
1727 static void rbd_watch_cb(u64 ver
, u64 notify_id
, u8 opcode
, void *data
)
1729 struct rbd_device
*rbd_dev
= (struct rbd_device
*)data
;
1736 dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n",
1737 rbd_dev
->header_name
, (unsigned long long) notify_id
,
1738 (unsigned int) opcode
);
1739 rc
= rbd_dev_refresh(rbd_dev
, &hver
);
1741 rbd_warn(rbd_dev
, "got notification but failed to "
1742 " update snaps: %d\n", rc
);
1744 rbd_obj_notify_ack(rbd_dev
, hver
, notify_id
);
1748 * Request sync osd watch/unwatch. The value of "start" determines
1749 * whether a watch request is being initiated or torn down.
1751 static int rbd_dev_header_watch_sync(struct rbd_device
*rbd_dev
, int start
)
1753 struct ceph_osd_client
*osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1754 struct rbd_obj_request
*obj_request
;
1755 struct ceph_osd_req_op
*op
;
1758 rbd_assert(start
^ !!rbd_dev
->watch_event
);
1759 rbd_assert(start
^ !!rbd_dev
->watch_request
);
1762 ret
= ceph_osdc_create_event(osdc
, rbd_watch_cb
, rbd_dev
,
1763 &rbd_dev
->watch_event
);
1766 rbd_assert(rbd_dev
->watch_event
!= NULL
);
1770 obj_request
= rbd_obj_request_create(rbd_dev
->header_name
, 0, 0,
1771 OBJ_REQUEST_NODATA
);
1775 op
= rbd_osd_req_op_create(CEPH_OSD_OP_WATCH
,
1776 rbd_dev
->watch_event
->cookie
,
1777 rbd_dev
->header
.obj_version
, start
);
1780 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, true,
1782 rbd_osd_req_op_destroy(op
);
1783 if (!obj_request
->osd_req
)
1787 ceph_osdc_set_request_linger(osdc
, obj_request
->osd_req
);
1789 ceph_osdc_unregister_linger_request(osdc
,
1790 rbd_dev
->watch_request
->osd_req
);
1791 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1794 ret
= rbd_obj_request_wait(obj_request
);
1797 ret
= obj_request
->result
;
1802 * A watch request is set to linger, so the underlying osd
1803 * request won't go away until we unregister it. We retain
1804 * a pointer to the object request during that time (in
1805 * rbd_dev->watch_request), so we'll keep a reference to
1806 * it. We'll drop that reference (below) after we've
1810 rbd_dev
->watch_request
= obj_request
;
1815 /* We have successfully torn down the watch request */
1817 rbd_obj_request_put(rbd_dev
->watch_request
);
1818 rbd_dev
->watch_request
= NULL
;
1820 /* Cancel the event if we're tearing down, or on error */
1821 ceph_osdc_cancel_event(rbd_dev
->watch_event
);
1822 rbd_dev
->watch_event
= NULL
;
1824 rbd_obj_request_put(obj_request
);
1830 * Synchronous osd object method call
1832 static int rbd_obj_method_sync(struct rbd_device
*rbd_dev
,
1833 const char *object_name
,
1834 const char *class_name
,
1835 const char *method_name
,
1836 const char *outbound
,
1837 size_t outbound_size
,
1839 size_t inbound_size
,
1842 struct rbd_obj_request
*obj_request
;
1843 struct ceph_osd_client
*osdc
;
1844 struct ceph_osd_req_op
*op
;
1845 struct page
**pages
;
1850 * Method calls are ultimately read operations but they
1851 * don't involve object data (so no offset or length).
1852 * The result should placed into the inbound buffer
1853 * provided. They also supply outbound data--parameters for
1854 * the object method. Currently if this is present it will
1857 page_count
= (u32
) calc_pages_for(0, inbound_size
);
1858 pages
= ceph_alloc_page_vector(page_count
, GFP_KERNEL
);
1860 return PTR_ERR(pages
);
1863 obj_request
= rbd_obj_request_create(object_name
, 0, 0,
1868 obj_request
->pages
= pages
;
1869 obj_request
->page_count
= page_count
;
1871 op
= rbd_osd_req_op_create(CEPH_OSD_OP_CALL
, class_name
,
1872 method_name
, outbound
, outbound_size
);
1875 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false,
1877 rbd_osd_req_op_destroy(op
);
1878 if (!obj_request
->osd_req
)
1881 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1882 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1885 ret
= rbd_obj_request_wait(obj_request
);
1889 ret
= obj_request
->result
;
1893 ceph_copy_from_page_vector(pages
, inbound
, 0, obj_request
->xferred
);
1895 *version
= obj_request
->version
;
1898 rbd_obj_request_put(obj_request
);
1900 ceph_release_page_vector(pages
, page_count
);
1905 static void rbd_request_fn(struct request_queue
*q
)
1907 struct rbd_device
*rbd_dev
= q
->queuedata
;
1908 bool read_only
= rbd_dev
->mapping
.read_only
;
1912 while ((rq
= blk_fetch_request(q
))) {
1913 bool write_request
= rq_data_dir(rq
) == WRITE
;
1914 struct rbd_img_request
*img_request
;
1918 /* Ignore any non-FS requests that filter through. */
1920 if (rq
->cmd_type
!= REQ_TYPE_FS
) {
1921 __blk_end_request_all(rq
, 0);
1925 spin_unlock_irq(q
->queue_lock
);
1927 /* Disallow writes to a read-only device */
1929 if (write_request
) {
1933 rbd_assert(rbd_dev
->spec
->snap_id
== CEPH_NOSNAP
);
1937 * Quit early if the mapped snapshot no longer
1938 * exists. It's still possible the snapshot will
1939 * have disappeared by the time our request arrives
1940 * at the osd, but there's no sense in sending it if
1943 if (!test_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
)) {
1944 dout("request for non-existent snapshot");
1945 rbd_assert(rbd_dev
->spec
->snap_id
!= CEPH_NOSNAP
);
1950 offset
= (u64
) blk_rq_pos(rq
) << SECTOR_SHIFT
;
1951 length
= (u64
) blk_rq_bytes(rq
);
1954 if (WARN_ON(offset
&& length
> U64_MAX
- offset
+ 1))
1955 goto end_request
; /* Shouldn't happen */
1958 img_request
= rbd_img_request_create(rbd_dev
, offset
, length
,
1963 img_request
->rq
= rq
;
1965 result
= rbd_img_request_fill_bio(img_request
, rq
->bio
);
1967 result
= rbd_img_request_submit(img_request
);
1969 rbd_img_request_put(img_request
);
1971 spin_lock_irq(q
->queue_lock
);
1973 rbd_warn(rbd_dev
, "obj_request %s result %d\n",
1974 write_request
? "write" : "read", result
);
1975 __blk_end_request_all(rq
, result
);
1981 * a queue callback. Makes sure that we don't create a bio that spans across
1982 * multiple osd objects. One exception would be with a single page bios,
1983 * which we handle later at bio_chain_clone_range()
1985 static int rbd_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bmd
,
1986 struct bio_vec
*bvec
)
1988 struct rbd_device
*rbd_dev
= q
->queuedata
;
1989 sector_t sector_offset
;
1990 sector_t sectors_per_obj
;
1991 sector_t obj_sector_offset
;
1995 * Find how far into its rbd object the partition-relative
1996 * bio start sector is to offset relative to the enclosing
1999 sector_offset
= get_start_sect(bmd
->bi_bdev
) + bmd
->bi_sector
;
2000 sectors_per_obj
= 1 << (rbd_dev
->header
.obj_order
- SECTOR_SHIFT
);
2001 obj_sector_offset
= sector_offset
& (sectors_per_obj
- 1);
2004 * Compute the number of bytes from that offset to the end
2005 * of the object. Account for what's already used by the bio.
2007 ret
= (int) (sectors_per_obj
- obj_sector_offset
) << SECTOR_SHIFT
;
2008 if (ret
> bmd
->bi_size
)
2009 ret
-= bmd
->bi_size
;
2014 * Don't send back more than was asked for. And if the bio
2015 * was empty, let the whole thing through because: "Note
2016 * that a block device *must* allow a single page to be
2017 * added to an empty bio."
2019 rbd_assert(bvec
->bv_len
<= PAGE_SIZE
);
2020 if (ret
> (int) bvec
->bv_len
|| !bmd
->bi_size
)
2021 ret
= (int) bvec
->bv_len
;
2026 static void rbd_free_disk(struct rbd_device
*rbd_dev
)
2028 struct gendisk
*disk
= rbd_dev
->disk
;
2033 if (disk
->flags
& GENHD_FL_UP
)
2036 blk_cleanup_queue(disk
->queue
);
2040 static int rbd_obj_read_sync(struct rbd_device
*rbd_dev
,
2041 const char *object_name
,
2042 u64 offset
, u64 length
,
2043 char *buf
, u64
*version
)
2046 struct ceph_osd_req_op
*op
;
2047 struct rbd_obj_request
*obj_request
;
2048 struct ceph_osd_client
*osdc
;
2049 struct page
**pages
= NULL
;
2054 page_count
= (u32
) calc_pages_for(offset
, length
);
2055 pages
= ceph_alloc_page_vector(page_count
, GFP_KERNEL
);
2057 ret
= PTR_ERR(pages
);
2060 obj_request
= rbd_obj_request_create(object_name
, offset
, length
,
2065 obj_request
->pages
= pages
;
2066 obj_request
->page_count
= page_count
;
2068 op
= rbd_osd_req_op_create(CEPH_OSD_OP_READ
, offset
, length
);
2071 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false,
2073 rbd_osd_req_op_destroy(op
);
2074 if (!obj_request
->osd_req
)
2077 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
2078 ret
= rbd_obj_request_submit(osdc
, obj_request
);
2081 ret
= rbd_obj_request_wait(obj_request
);
2085 ret
= obj_request
->result
;
2089 rbd_assert(obj_request
->xferred
<= (u64
) SIZE_MAX
);
2090 size
= (size_t) obj_request
->xferred
;
2091 ceph_copy_from_page_vector(pages
, buf
, 0, size
);
2092 rbd_assert(size
<= (size_t) INT_MAX
);
2095 *version
= obj_request
->version
;
2098 rbd_obj_request_put(obj_request
);
2100 ceph_release_page_vector(pages
, page_count
);
2106 * Read the complete header for the given rbd device.
2108 * Returns a pointer to a dynamically-allocated buffer containing
2109 * the complete and validated header. Caller can pass the address
2110 * of a variable that will be filled in with the version of the
2111 * header object at the time it was read.
2113 * Returns a pointer-coded errno if a failure occurs.
2115 static struct rbd_image_header_ondisk
*
2116 rbd_dev_v1_header_read(struct rbd_device
*rbd_dev
, u64
*version
)
2118 struct rbd_image_header_ondisk
*ondisk
= NULL
;
2125 * The complete header will include an array of its 64-bit
2126 * snapshot ids, followed by the names of those snapshots as
2127 * a contiguous block of NUL-terminated strings. Note that
2128 * the number of snapshots could change by the time we read
2129 * it in, in which case we re-read it.
2136 size
= sizeof (*ondisk
);
2137 size
+= snap_count
* sizeof (struct rbd_image_snap_ondisk
);
2139 ondisk
= kmalloc(size
, GFP_KERNEL
);
2141 return ERR_PTR(-ENOMEM
);
2143 ret
= rbd_obj_read_sync(rbd_dev
, rbd_dev
->header_name
,
2145 (char *) ondisk
, version
);
2148 if (WARN_ON((size_t) ret
< size
)) {
2150 rbd_warn(rbd_dev
, "short header read (want %zd got %d)",
2154 if (!rbd_dev_ondisk_valid(ondisk
)) {
2156 rbd_warn(rbd_dev
, "invalid header");
2160 names_size
= le64_to_cpu(ondisk
->snap_names_len
);
2161 want_count
= snap_count
;
2162 snap_count
= le32_to_cpu(ondisk
->snap_count
);
2163 } while (snap_count
!= want_count
);
2170 return ERR_PTR(ret
);
2174 * reload the ondisk the header
2176 static int rbd_read_header(struct rbd_device
*rbd_dev
,
2177 struct rbd_image_header
*header
)
2179 struct rbd_image_header_ondisk
*ondisk
;
2183 ondisk
= rbd_dev_v1_header_read(rbd_dev
, &ver
);
2185 return PTR_ERR(ondisk
);
2186 ret
= rbd_header_from_disk(header
, ondisk
);
2188 header
->obj_version
= ver
;
2194 static void rbd_remove_all_snaps(struct rbd_device
*rbd_dev
)
2196 struct rbd_snap
*snap
;
2197 struct rbd_snap
*next
;
2199 list_for_each_entry_safe(snap
, next
, &rbd_dev
->snaps
, node
)
2200 rbd_remove_snap_dev(snap
);
2203 static void rbd_update_mapping_size(struct rbd_device
*rbd_dev
)
2207 if (rbd_dev
->spec
->snap_id
!= CEPH_NOSNAP
)
2210 size
= (sector_t
) rbd_dev
->header
.image_size
/ SECTOR_SIZE
;
2211 dout("setting size to %llu sectors", (unsigned long long) size
);
2212 rbd_dev
->mapping
.size
= (u64
) size
;
2213 set_capacity(rbd_dev
->disk
, size
);
2217 * only read the first part of the ondisk header, without the snaps info
2219 static int rbd_dev_v1_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
2222 struct rbd_image_header h
;
2224 ret
= rbd_read_header(rbd_dev
, &h
);
2228 down_write(&rbd_dev
->header_rwsem
);
2230 /* Update image size, and check for resize of mapped image */
2231 rbd_dev
->header
.image_size
= h
.image_size
;
2232 rbd_update_mapping_size(rbd_dev
);
2234 /* rbd_dev->header.object_prefix shouldn't change */
2235 kfree(rbd_dev
->header
.snap_sizes
);
2236 kfree(rbd_dev
->header
.snap_names
);
2237 /* osd requests may still refer to snapc */
2238 ceph_put_snap_context(rbd_dev
->header
.snapc
);
2241 *hver
= h
.obj_version
;
2242 rbd_dev
->header
.obj_version
= h
.obj_version
;
2243 rbd_dev
->header
.image_size
= h
.image_size
;
2244 rbd_dev
->header
.snapc
= h
.snapc
;
2245 rbd_dev
->header
.snap_names
= h
.snap_names
;
2246 rbd_dev
->header
.snap_sizes
= h
.snap_sizes
;
2247 /* Free the extra copy of the object prefix */
2248 WARN_ON(strcmp(rbd_dev
->header
.object_prefix
, h
.object_prefix
));
2249 kfree(h
.object_prefix
);
2251 ret
= rbd_dev_snaps_update(rbd_dev
);
2253 ret
= rbd_dev_snaps_register(rbd_dev
);
2255 up_write(&rbd_dev
->header_rwsem
);
2260 static int rbd_dev_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
2264 rbd_assert(rbd_image_format_valid(rbd_dev
->image_format
));
2265 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2266 if (rbd_dev
->image_format
== 1)
2267 ret
= rbd_dev_v1_refresh(rbd_dev
, hver
);
2269 ret
= rbd_dev_v2_refresh(rbd_dev
, hver
);
2270 mutex_unlock(&ctl_mutex
);
2275 static int rbd_init_disk(struct rbd_device
*rbd_dev
)
2277 struct gendisk
*disk
;
2278 struct request_queue
*q
;
2281 /* create gendisk info */
2282 disk
= alloc_disk(RBD_MINORS_PER_MAJOR
);
2286 snprintf(disk
->disk_name
, sizeof(disk
->disk_name
), RBD_DRV_NAME
"%d",
2288 disk
->major
= rbd_dev
->major
;
2289 disk
->first_minor
= 0;
2290 disk
->fops
= &rbd_bd_ops
;
2291 disk
->private_data
= rbd_dev
;
2293 q
= blk_init_queue(rbd_request_fn
, &rbd_dev
->lock
);
2297 /* We use the default size, but let's be explicit about it. */
2298 blk_queue_physical_block_size(q
, SECTOR_SIZE
);
2300 /* set io sizes to object size */
2301 segment_size
= rbd_obj_bytes(&rbd_dev
->header
);
2302 blk_queue_max_hw_sectors(q
, segment_size
/ SECTOR_SIZE
);
2303 blk_queue_max_segment_size(q
, segment_size
);
2304 blk_queue_io_min(q
, segment_size
);
2305 blk_queue_io_opt(q
, segment_size
);
2307 blk_queue_merge_bvec(q
, rbd_merge_bvec
);
2310 q
->queuedata
= rbd_dev
;
2312 rbd_dev
->disk
= disk
;
2314 set_capacity(rbd_dev
->disk
, rbd_dev
->mapping
.size
/ SECTOR_SIZE
);
2327 static struct rbd_device
*dev_to_rbd_dev(struct device
*dev
)
2329 return container_of(dev
, struct rbd_device
, dev
);
2332 static ssize_t
rbd_size_show(struct device
*dev
,
2333 struct device_attribute
*attr
, char *buf
)
2335 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2338 down_read(&rbd_dev
->header_rwsem
);
2339 size
= get_capacity(rbd_dev
->disk
);
2340 up_read(&rbd_dev
->header_rwsem
);
2342 return sprintf(buf
, "%llu\n", (unsigned long long) size
* SECTOR_SIZE
);
2346 * Note this shows the features for whatever's mapped, which is not
2347 * necessarily the base image.
2349 static ssize_t
rbd_features_show(struct device
*dev
,
2350 struct device_attribute
*attr
, char *buf
)
2352 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2354 return sprintf(buf
, "0x%016llx\n",
2355 (unsigned long long) rbd_dev
->mapping
.features
);
2358 static ssize_t
rbd_major_show(struct device
*dev
,
2359 struct device_attribute
*attr
, char *buf
)
2361 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2363 return sprintf(buf
, "%d\n", rbd_dev
->major
);
2366 static ssize_t
rbd_client_id_show(struct device
*dev
,
2367 struct device_attribute
*attr
, char *buf
)
2369 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2371 return sprintf(buf
, "client%lld\n",
2372 ceph_client_id(rbd_dev
->rbd_client
->client
));
2375 static ssize_t
rbd_pool_show(struct device
*dev
,
2376 struct device_attribute
*attr
, char *buf
)
2378 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2380 return sprintf(buf
, "%s\n", rbd_dev
->spec
->pool_name
);
2383 static ssize_t
rbd_pool_id_show(struct device
*dev
,
2384 struct device_attribute
*attr
, char *buf
)
2386 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2388 return sprintf(buf
, "%llu\n",
2389 (unsigned long long) rbd_dev
->spec
->pool_id
);
2392 static ssize_t
rbd_name_show(struct device
*dev
,
2393 struct device_attribute
*attr
, char *buf
)
2395 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2397 if (rbd_dev
->spec
->image_name
)
2398 return sprintf(buf
, "%s\n", rbd_dev
->spec
->image_name
);
2400 return sprintf(buf
, "(unknown)\n");
2403 static ssize_t
rbd_image_id_show(struct device
*dev
,
2404 struct device_attribute
*attr
, char *buf
)
2406 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2408 return sprintf(buf
, "%s\n", rbd_dev
->spec
->image_id
);
2412 * Shows the name of the currently-mapped snapshot (or
2413 * RBD_SNAP_HEAD_NAME for the base image).
2415 static ssize_t
rbd_snap_show(struct device
*dev
,
2416 struct device_attribute
*attr
,
2419 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2421 return sprintf(buf
, "%s\n", rbd_dev
->spec
->snap_name
);
2425 * For an rbd v2 image, shows the pool id, image id, and snapshot id
2426 * for the parent image. If there is no parent, simply shows
2427 * "(no parent image)".
2429 static ssize_t
rbd_parent_show(struct device
*dev
,
2430 struct device_attribute
*attr
,
2433 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2434 struct rbd_spec
*spec
= rbd_dev
->parent_spec
;
2439 return sprintf(buf
, "(no parent image)\n");
2441 count
= sprintf(bufp
, "pool_id %llu\npool_name %s\n",
2442 (unsigned long long) spec
->pool_id
, spec
->pool_name
);
2447 count
= sprintf(bufp
, "image_id %s\nimage_name %s\n", spec
->image_id
,
2448 spec
->image_name
? spec
->image_name
: "(unknown)");
2453 count
= sprintf(bufp
, "snap_id %llu\nsnap_name %s\n",
2454 (unsigned long long) spec
->snap_id
, spec
->snap_name
);
2459 count
= sprintf(bufp
, "overlap %llu\n", rbd_dev
->parent_overlap
);
2464 return (ssize_t
) (bufp
- buf
);
2467 static ssize_t
rbd_image_refresh(struct device
*dev
,
2468 struct device_attribute
*attr
,
2472 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2475 ret
= rbd_dev_refresh(rbd_dev
, NULL
);
2477 return ret
< 0 ? ret
: size
;
2480 static DEVICE_ATTR(size
, S_IRUGO
, rbd_size_show
, NULL
);
2481 static DEVICE_ATTR(features
, S_IRUGO
, rbd_features_show
, NULL
);
2482 static DEVICE_ATTR(major
, S_IRUGO
, rbd_major_show
, NULL
);
2483 static DEVICE_ATTR(client_id
, S_IRUGO
, rbd_client_id_show
, NULL
);
2484 static DEVICE_ATTR(pool
, S_IRUGO
, rbd_pool_show
, NULL
);
2485 static DEVICE_ATTR(pool_id
, S_IRUGO
, rbd_pool_id_show
, NULL
);
2486 static DEVICE_ATTR(name
, S_IRUGO
, rbd_name_show
, NULL
);
2487 static DEVICE_ATTR(image_id
, S_IRUGO
, rbd_image_id_show
, NULL
);
2488 static DEVICE_ATTR(refresh
, S_IWUSR
, NULL
, rbd_image_refresh
);
2489 static DEVICE_ATTR(current_snap
, S_IRUGO
, rbd_snap_show
, NULL
);
2490 static DEVICE_ATTR(parent
, S_IRUGO
, rbd_parent_show
, NULL
);
2492 static struct attribute
*rbd_attrs
[] = {
2493 &dev_attr_size
.attr
,
2494 &dev_attr_features
.attr
,
2495 &dev_attr_major
.attr
,
2496 &dev_attr_client_id
.attr
,
2497 &dev_attr_pool
.attr
,
2498 &dev_attr_pool_id
.attr
,
2499 &dev_attr_name
.attr
,
2500 &dev_attr_image_id
.attr
,
2501 &dev_attr_current_snap
.attr
,
2502 &dev_attr_parent
.attr
,
2503 &dev_attr_refresh
.attr
,
2507 static struct attribute_group rbd_attr_group
= {
2511 static const struct attribute_group
*rbd_attr_groups
[] = {
2516 static void rbd_sysfs_dev_release(struct device
*dev
)
2520 static struct device_type rbd_device_type
= {
2522 .groups
= rbd_attr_groups
,
2523 .release
= rbd_sysfs_dev_release
,
2531 static ssize_t
rbd_snap_size_show(struct device
*dev
,
2532 struct device_attribute
*attr
,
2535 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2537 return sprintf(buf
, "%llu\n", (unsigned long long)snap
->size
);
2540 static ssize_t
rbd_snap_id_show(struct device
*dev
,
2541 struct device_attribute
*attr
,
2544 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2546 return sprintf(buf
, "%llu\n", (unsigned long long)snap
->id
);
2549 static ssize_t
rbd_snap_features_show(struct device
*dev
,
2550 struct device_attribute
*attr
,
2553 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2555 return sprintf(buf
, "0x%016llx\n",
2556 (unsigned long long) snap
->features
);
2559 static DEVICE_ATTR(snap_size
, S_IRUGO
, rbd_snap_size_show
, NULL
);
2560 static DEVICE_ATTR(snap_id
, S_IRUGO
, rbd_snap_id_show
, NULL
);
2561 static DEVICE_ATTR(snap_features
, S_IRUGO
, rbd_snap_features_show
, NULL
);
2563 static struct attribute
*rbd_snap_attrs
[] = {
2564 &dev_attr_snap_size
.attr
,
2565 &dev_attr_snap_id
.attr
,
2566 &dev_attr_snap_features
.attr
,
2570 static struct attribute_group rbd_snap_attr_group
= {
2571 .attrs
= rbd_snap_attrs
,
2574 static void rbd_snap_dev_release(struct device
*dev
)
2576 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2581 static const struct attribute_group
*rbd_snap_attr_groups
[] = {
2582 &rbd_snap_attr_group
,
2586 static struct device_type rbd_snap_device_type
= {
2587 .groups
= rbd_snap_attr_groups
,
2588 .release
= rbd_snap_dev_release
,
2591 static struct rbd_spec
*rbd_spec_get(struct rbd_spec
*spec
)
2593 kref_get(&spec
->kref
);
2598 static void rbd_spec_free(struct kref
*kref
);
2599 static void rbd_spec_put(struct rbd_spec
*spec
)
2602 kref_put(&spec
->kref
, rbd_spec_free
);
2605 static struct rbd_spec
*rbd_spec_alloc(void)
2607 struct rbd_spec
*spec
;
2609 spec
= kzalloc(sizeof (*spec
), GFP_KERNEL
);
2612 kref_init(&spec
->kref
);
2614 rbd_spec_put(rbd_spec_get(spec
)); /* TEMPORARY */
2619 static void rbd_spec_free(struct kref
*kref
)
2621 struct rbd_spec
*spec
= container_of(kref
, struct rbd_spec
, kref
);
2623 kfree(spec
->pool_name
);
2624 kfree(spec
->image_id
);
2625 kfree(spec
->image_name
);
2626 kfree(spec
->snap_name
);
2630 struct rbd_device
*rbd_dev_create(struct rbd_client
*rbdc
,
2631 struct rbd_spec
*spec
)
2633 struct rbd_device
*rbd_dev
;
2635 rbd_dev
= kzalloc(sizeof (*rbd_dev
), GFP_KERNEL
);
2639 spin_lock_init(&rbd_dev
->lock
);
2641 INIT_LIST_HEAD(&rbd_dev
->node
);
2642 INIT_LIST_HEAD(&rbd_dev
->snaps
);
2643 init_rwsem(&rbd_dev
->header_rwsem
);
2645 rbd_dev
->spec
= spec
;
2646 rbd_dev
->rbd_client
= rbdc
;
2648 /* Initialize the layout used for all rbd requests */
2650 rbd_dev
->layout
.fl_stripe_unit
= cpu_to_le32(1 << RBD_MAX_OBJ_ORDER
);
2651 rbd_dev
->layout
.fl_stripe_count
= cpu_to_le32(1);
2652 rbd_dev
->layout
.fl_object_size
= cpu_to_le32(1 << RBD_MAX_OBJ_ORDER
);
2653 rbd_dev
->layout
.fl_pg_pool
= cpu_to_le32((u32
) spec
->pool_id
);
2658 static void rbd_dev_destroy(struct rbd_device
*rbd_dev
)
2660 rbd_spec_put(rbd_dev
->parent_spec
);
2661 kfree(rbd_dev
->header_name
);
2662 rbd_put_client(rbd_dev
->rbd_client
);
2663 rbd_spec_put(rbd_dev
->spec
);
2667 static bool rbd_snap_registered(struct rbd_snap
*snap
)
2669 bool ret
= snap
->dev
.type
== &rbd_snap_device_type
;
2670 bool reg
= device_is_registered(&snap
->dev
);
2672 rbd_assert(!ret
^ reg
);
2677 static void rbd_remove_snap_dev(struct rbd_snap
*snap
)
2679 list_del(&snap
->node
);
2680 if (device_is_registered(&snap
->dev
))
2681 device_unregister(&snap
->dev
);
2684 static int rbd_register_snap_dev(struct rbd_snap
*snap
,
2685 struct device
*parent
)
2687 struct device
*dev
= &snap
->dev
;
2690 dev
->type
= &rbd_snap_device_type
;
2691 dev
->parent
= parent
;
2692 dev
->release
= rbd_snap_dev_release
;
2693 dev_set_name(dev
, "%s%s", RBD_SNAP_DEV_NAME_PREFIX
, snap
->name
);
2694 dout("%s: registering device for snapshot %s\n", __func__
, snap
->name
);
2696 ret
= device_register(dev
);
2701 static struct rbd_snap
*__rbd_add_snap_dev(struct rbd_device
*rbd_dev
,
2702 const char *snap_name
,
2703 u64 snap_id
, u64 snap_size
,
2706 struct rbd_snap
*snap
;
2709 snap
= kzalloc(sizeof (*snap
), GFP_KERNEL
);
2711 return ERR_PTR(-ENOMEM
);
2714 snap
->name
= kstrdup(snap_name
, GFP_KERNEL
);
2719 snap
->size
= snap_size
;
2720 snap
->features
= snap_features
;
2728 return ERR_PTR(ret
);
2731 static char *rbd_dev_v1_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
2732 u64
*snap_size
, u64
*snap_features
)
2736 rbd_assert(which
< rbd_dev
->header
.snapc
->num_snaps
);
2738 *snap_size
= rbd_dev
->header
.snap_sizes
[which
];
2739 *snap_features
= 0; /* No features for v1 */
2741 /* Skip over names until we find the one we are looking for */
2743 snap_name
= rbd_dev
->header
.snap_names
;
2745 snap_name
+= strlen(snap_name
) + 1;
2751 * Get the size and object order for an image snapshot, or if
2752 * snap_id is CEPH_NOSNAP, gets this information for the base
2755 static int _rbd_dev_v2_snap_size(struct rbd_device
*rbd_dev
, u64 snap_id
,
2756 u8
*order
, u64
*snap_size
)
2758 __le64 snapid
= cpu_to_le64(snap_id
);
2763 } __attribute__ ((packed
)) size_buf
= { 0 };
2765 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2767 (char *) &snapid
, sizeof (snapid
),
2768 (char *) &size_buf
, sizeof (size_buf
), NULL
);
2769 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2773 *order
= size_buf
.order
;
2774 *snap_size
= le64_to_cpu(size_buf
.size
);
2776 dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n",
2777 (unsigned long long) snap_id
, (unsigned int) *order
,
2778 (unsigned long long) *snap_size
);
2783 static int rbd_dev_v2_image_size(struct rbd_device
*rbd_dev
)
2785 return _rbd_dev_v2_snap_size(rbd_dev
, CEPH_NOSNAP
,
2786 &rbd_dev
->header
.obj_order
,
2787 &rbd_dev
->header
.image_size
);
2790 static int rbd_dev_v2_object_prefix(struct rbd_device
*rbd_dev
)
2796 reply_buf
= kzalloc(RBD_OBJ_PREFIX_LEN_MAX
, GFP_KERNEL
);
2800 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2801 "rbd", "get_object_prefix",
2803 reply_buf
, RBD_OBJ_PREFIX_LEN_MAX
, NULL
);
2804 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2809 rbd_dev
->header
.object_prefix
= ceph_extract_encoded_string(&p
,
2810 p
+ RBD_OBJ_PREFIX_LEN_MAX
,
2813 if (IS_ERR(rbd_dev
->header
.object_prefix
)) {
2814 ret
= PTR_ERR(rbd_dev
->header
.object_prefix
);
2815 rbd_dev
->header
.object_prefix
= NULL
;
2817 dout(" object_prefix = %s\n", rbd_dev
->header
.object_prefix
);
2826 static int _rbd_dev_v2_snap_features(struct rbd_device
*rbd_dev
, u64 snap_id
,
2829 __le64 snapid
= cpu_to_le64(snap_id
);
2833 } features_buf
= { 0 };
2837 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2838 "rbd", "get_features",
2839 (char *) &snapid
, sizeof (snapid
),
2840 (char *) &features_buf
, sizeof (features_buf
),
2842 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2846 incompat
= le64_to_cpu(features_buf
.incompat
);
2847 if (incompat
& ~RBD_FEATURES_ALL
)
2850 *snap_features
= le64_to_cpu(features_buf
.features
);
2852 dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
2853 (unsigned long long) snap_id
,
2854 (unsigned long long) *snap_features
,
2855 (unsigned long long) le64_to_cpu(features_buf
.incompat
));
2860 static int rbd_dev_v2_features(struct rbd_device
*rbd_dev
)
2862 return _rbd_dev_v2_snap_features(rbd_dev
, CEPH_NOSNAP
,
2863 &rbd_dev
->header
.features
);
2866 static int rbd_dev_v2_parent_info(struct rbd_device
*rbd_dev
)
2868 struct rbd_spec
*parent_spec
;
2870 void *reply_buf
= NULL
;
2878 parent_spec
= rbd_spec_alloc();
2882 size
= sizeof (__le64
) + /* pool_id */
2883 sizeof (__le32
) + RBD_IMAGE_ID_LEN_MAX
+ /* image_id */
2884 sizeof (__le64
) + /* snap_id */
2885 sizeof (__le64
); /* overlap */
2886 reply_buf
= kmalloc(size
, GFP_KERNEL
);
2892 snapid
= cpu_to_le64(CEPH_NOSNAP
);
2893 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2894 "rbd", "get_parent",
2895 (char *) &snapid
, sizeof (snapid
),
2896 (char *) reply_buf
, size
, NULL
);
2897 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2903 end
= (char *) reply_buf
+ size
;
2904 ceph_decode_64_safe(&p
, end
, parent_spec
->pool_id
, out_err
);
2905 if (parent_spec
->pool_id
== CEPH_NOPOOL
)
2906 goto out
; /* No parent? No problem. */
2908 /* The ceph file layout needs to fit pool id in 32 bits */
2911 if (WARN_ON(parent_spec
->pool_id
> (u64
) U32_MAX
))
2914 image_id
= ceph_extract_encoded_string(&p
, end
, NULL
, GFP_KERNEL
);
2915 if (IS_ERR(image_id
)) {
2916 ret
= PTR_ERR(image_id
);
2919 parent_spec
->image_id
= image_id
;
2920 ceph_decode_64_safe(&p
, end
, parent_spec
->snap_id
, out_err
);
2921 ceph_decode_64_safe(&p
, end
, overlap
, out_err
);
2923 rbd_dev
->parent_overlap
= overlap
;
2924 rbd_dev
->parent_spec
= parent_spec
;
2925 parent_spec
= NULL
; /* rbd_dev now owns this */
2930 rbd_spec_put(parent_spec
);
2935 static char *rbd_dev_image_name(struct rbd_device
*rbd_dev
)
2937 size_t image_id_size
;
2942 void *reply_buf
= NULL
;
2944 char *image_name
= NULL
;
2947 rbd_assert(!rbd_dev
->spec
->image_name
);
2949 len
= strlen(rbd_dev
->spec
->image_id
);
2950 image_id_size
= sizeof (__le32
) + len
;
2951 image_id
= kmalloc(image_id_size
, GFP_KERNEL
);
2956 end
= (char *) image_id
+ image_id_size
;
2957 ceph_encode_string(&p
, end
, rbd_dev
->spec
->image_id
, (u32
) len
);
2959 size
= sizeof (__le32
) + RBD_IMAGE_NAME_LEN_MAX
;
2960 reply_buf
= kmalloc(size
, GFP_KERNEL
);
2964 ret
= rbd_obj_method_sync(rbd_dev
, RBD_DIRECTORY
,
2965 "rbd", "dir_get_name",
2966 image_id
, image_id_size
,
2967 (char *) reply_buf
, size
, NULL
);
2971 end
= (char *) reply_buf
+ size
;
2972 image_name
= ceph_extract_encoded_string(&p
, end
, &len
, GFP_KERNEL
);
2973 if (IS_ERR(image_name
))
2976 dout("%s: name is %s len is %zd\n", __func__
, image_name
, len
);
2985 * When a parent image gets probed, we only have the pool, image,
2986 * and snapshot ids but not the names of any of them. This call
2987 * is made later to fill in those names. It has to be done after
2988 * rbd_dev_snaps_update() has completed because some of the
2989 * information (in particular, snapshot name) is not available
2992 static int rbd_dev_probe_update_spec(struct rbd_device
*rbd_dev
)
2994 struct ceph_osd_client
*osdc
;
2996 void *reply_buf
= NULL
;
2999 if (rbd_dev
->spec
->pool_name
)
3000 return 0; /* Already have the names */
3002 /* Look up the pool name */
3004 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
3005 name
= ceph_pg_pool_name_by_id(osdc
->osdmap
, rbd_dev
->spec
->pool_id
);
3007 rbd_warn(rbd_dev
, "there is no pool with id %llu",
3008 rbd_dev
->spec
->pool_id
); /* Really a BUG() */
3012 rbd_dev
->spec
->pool_name
= kstrdup(name
, GFP_KERNEL
);
3013 if (!rbd_dev
->spec
->pool_name
)
3016 /* Fetch the image name; tolerate failure here */
3018 name
= rbd_dev_image_name(rbd_dev
);
3020 rbd_dev
->spec
->image_name
= (char *) name
;
3022 rbd_warn(rbd_dev
, "unable to get image name");
3024 /* Look up the snapshot name. */
3026 name
= rbd_snap_name(rbd_dev
, rbd_dev
->spec
->snap_id
);
3028 rbd_warn(rbd_dev
, "no snapshot with id %llu",
3029 rbd_dev
->spec
->snap_id
); /* Really a BUG() */
3033 rbd_dev
->spec
->snap_name
= kstrdup(name
, GFP_KERNEL
);
3034 if(!rbd_dev
->spec
->snap_name
)
3040 kfree(rbd_dev
->spec
->pool_name
);
3041 rbd_dev
->spec
->pool_name
= NULL
;
3046 static int rbd_dev_v2_snap_context(struct rbd_device
*rbd_dev
, u64
*ver
)
3055 struct ceph_snap_context
*snapc
;
3059 * We'll need room for the seq value (maximum snapshot id),
3060 * snapshot count, and array of that many snapshot ids.
3061 * For now we have a fixed upper limit on the number we're
3062 * prepared to receive.
3064 size
= sizeof (__le64
) + sizeof (__le32
) +
3065 RBD_MAX_SNAP_COUNT
* sizeof (__le64
);
3066 reply_buf
= kzalloc(size
, GFP_KERNEL
);
3070 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
3071 "rbd", "get_snapcontext",
3073 reply_buf
, size
, ver
);
3074 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3080 end
= (char *) reply_buf
+ size
;
3081 ceph_decode_64_safe(&p
, end
, seq
, out
);
3082 ceph_decode_32_safe(&p
, end
, snap_count
, out
);
3085 * Make sure the reported number of snapshot ids wouldn't go
3086 * beyond the end of our buffer. But before checking that,
3087 * make sure the computed size of the snapshot context we
3088 * allocate is representable in a size_t.
3090 if (snap_count
> (SIZE_MAX
- sizeof (struct ceph_snap_context
))
3095 if (!ceph_has_room(&p
, end
, snap_count
* sizeof (__le64
)))
3098 size
= sizeof (struct ceph_snap_context
) +
3099 snap_count
* sizeof (snapc
->snaps
[0]);
3100 snapc
= kmalloc(size
, GFP_KERNEL
);
3106 atomic_set(&snapc
->nref
, 1);
3108 snapc
->num_snaps
= snap_count
;
3109 for (i
= 0; i
< snap_count
; i
++)
3110 snapc
->snaps
[i
] = ceph_decode_64(&p
);
3112 rbd_dev
->header
.snapc
= snapc
;
3114 dout(" snap context seq = %llu, snap_count = %u\n",
3115 (unsigned long long) seq
, (unsigned int) snap_count
);
3123 static char *rbd_dev_v2_snap_name(struct rbd_device
*rbd_dev
, u32 which
)
3133 size
= sizeof (__le32
) + RBD_MAX_SNAP_NAME_LEN
;
3134 reply_buf
= kmalloc(size
, GFP_KERNEL
);
3136 return ERR_PTR(-ENOMEM
);
3138 snap_id
= cpu_to_le64(rbd_dev
->header
.snapc
->snaps
[which
]);
3139 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
3140 "rbd", "get_snapshot_name",
3141 (char *) &snap_id
, sizeof (snap_id
),
3142 reply_buf
, size
, NULL
);
3143 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3148 end
= (char *) reply_buf
+ size
;
3149 snap_name
= ceph_extract_encoded_string(&p
, end
, NULL
, GFP_KERNEL
);
3150 if (IS_ERR(snap_name
)) {
3151 ret
= PTR_ERR(snap_name
);
3154 dout(" snap_id 0x%016llx snap_name = %s\n",
3155 (unsigned long long) le64_to_cpu(snap_id
), snap_name
);
3163 return ERR_PTR(ret
);
3166 static char *rbd_dev_v2_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
3167 u64
*snap_size
, u64
*snap_features
)
3173 snap_id
= rbd_dev
->header
.snapc
->snaps
[which
];
3174 ret
= _rbd_dev_v2_snap_size(rbd_dev
, snap_id
, &order
, snap_size
);
3176 return ERR_PTR(ret
);
3177 ret
= _rbd_dev_v2_snap_features(rbd_dev
, snap_id
, snap_features
);
3179 return ERR_PTR(ret
);
3181 return rbd_dev_v2_snap_name(rbd_dev
, which
);
3184 static char *rbd_dev_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
3185 u64
*snap_size
, u64
*snap_features
)
3187 if (rbd_dev
->image_format
== 1)
3188 return rbd_dev_v1_snap_info(rbd_dev
, which
,
3189 snap_size
, snap_features
);
3190 if (rbd_dev
->image_format
== 2)
3191 return rbd_dev_v2_snap_info(rbd_dev
, which
,
3192 snap_size
, snap_features
);
3193 return ERR_PTR(-EINVAL
);
3196 static int rbd_dev_v2_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
3201 down_write(&rbd_dev
->header_rwsem
);
3203 /* Grab old order first, to see if it changes */
3205 obj_order
= rbd_dev
->header
.obj_order
,
3206 ret
= rbd_dev_v2_image_size(rbd_dev
);
3209 if (rbd_dev
->header
.obj_order
!= obj_order
) {
3213 rbd_update_mapping_size(rbd_dev
);
3215 ret
= rbd_dev_v2_snap_context(rbd_dev
, hver
);
3216 dout("rbd_dev_v2_snap_context returned %d\n", ret
);
3219 ret
= rbd_dev_snaps_update(rbd_dev
);
3220 dout("rbd_dev_snaps_update returned %d\n", ret
);
3223 ret
= rbd_dev_snaps_register(rbd_dev
);
3224 dout("rbd_dev_snaps_register returned %d\n", ret
);
3226 up_write(&rbd_dev
->header_rwsem
);
3232 * Scan the rbd device's current snapshot list and compare it to the
3233 * newly-received snapshot context. Remove any existing snapshots
3234 * not present in the new snapshot context. Add a new snapshot for
3235 * any snaphots in the snapshot context not in the current list.
3236 * And verify there are no changes to snapshots we already know
3239 * Assumes the snapshots in the snapshot context are sorted by
3240 * snapshot id, highest id first. (Snapshots in the rbd_dev's list
3241 * are also maintained in that order.)
3243 static int rbd_dev_snaps_update(struct rbd_device
*rbd_dev
)
3245 struct ceph_snap_context
*snapc
= rbd_dev
->header
.snapc
;
3246 const u32 snap_count
= snapc
->num_snaps
;
3247 struct list_head
*head
= &rbd_dev
->snaps
;
3248 struct list_head
*links
= head
->next
;
3251 dout("%s: snap count is %u\n", __func__
, (unsigned int) snap_count
);
3252 while (index
< snap_count
|| links
!= head
) {
3254 struct rbd_snap
*snap
;
3257 u64 snap_features
= 0;
3259 snap_id
= index
< snap_count
? snapc
->snaps
[index
]
3261 snap
= links
!= head
? list_entry(links
, struct rbd_snap
, node
)
3263 rbd_assert(!snap
|| snap
->id
!= CEPH_NOSNAP
);
3265 if (snap_id
== CEPH_NOSNAP
|| (snap
&& snap
->id
> snap_id
)) {
3266 struct list_head
*next
= links
->next
;
3269 * A previously-existing snapshot is not in
3270 * the new snap context.
3272 * If the now missing snapshot is the one the
3273 * image is mapped to, clear its exists flag
3274 * so we can avoid sending any more requests
3277 if (rbd_dev
->spec
->snap_id
== snap
->id
)
3278 clear_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
);
3279 rbd_remove_snap_dev(snap
);
3280 dout("%ssnap id %llu has been removed\n",
3281 rbd_dev
->spec
->snap_id
== snap
->id
?
3283 (unsigned long long) snap
->id
);
3285 /* Done with this list entry; advance */
3291 snap_name
= rbd_dev_snap_info(rbd_dev
, index
,
3292 &snap_size
, &snap_features
);
3293 if (IS_ERR(snap_name
))
3294 return PTR_ERR(snap_name
);
3296 dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count
,
3297 (unsigned long long) snap_id
);
3298 if (!snap
|| (snap_id
!= CEPH_NOSNAP
&& snap
->id
< snap_id
)) {
3299 struct rbd_snap
*new_snap
;
3301 /* We haven't seen this snapshot before */
3303 new_snap
= __rbd_add_snap_dev(rbd_dev
, snap_name
,
3304 snap_id
, snap_size
, snap_features
);
3305 if (IS_ERR(new_snap
)) {
3306 int err
= PTR_ERR(new_snap
);
3308 dout(" failed to add dev, error %d\n", err
);
3313 /* New goes before existing, or at end of list */
3315 dout(" added dev%s\n", snap
? "" : " at end\n");
3317 list_add_tail(&new_snap
->node
, &snap
->node
);
3319 list_add_tail(&new_snap
->node
, head
);
3321 /* Already have this one */
3323 dout(" already present\n");
3325 rbd_assert(snap
->size
== snap_size
);
3326 rbd_assert(!strcmp(snap
->name
, snap_name
));
3327 rbd_assert(snap
->features
== snap_features
);
3329 /* Done with this list entry; advance */
3331 links
= links
->next
;
3334 /* Advance to the next entry in the snapshot context */
3338 dout("%s: done\n", __func__
);
3344 * Scan the list of snapshots and register the devices for any that
3345 * have not already been registered.
3347 static int rbd_dev_snaps_register(struct rbd_device
*rbd_dev
)
3349 struct rbd_snap
*snap
;
3352 dout("%s called\n", __func__
);
3353 if (WARN_ON(!device_is_registered(&rbd_dev
->dev
)))
3356 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
) {
3357 if (!rbd_snap_registered(snap
)) {
3358 ret
= rbd_register_snap_dev(snap
, &rbd_dev
->dev
);
3363 dout("%s: returning %d\n", __func__
, ret
);
3368 static int rbd_bus_add_dev(struct rbd_device
*rbd_dev
)
3373 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
3375 dev
= &rbd_dev
->dev
;
3376 dev
->bus
= &rbd_bus_type
;
3377 dev
->type
= &rbd_device_type
;
3378 dev
->parent
= &rbd_root_dev
;
3379 dev
->release
= rbd_dev_release
;
3380 dev_set_name(dev
, "%d", rbd_dev
->dev_id
);
3381 ret
= device_register(dev
);
3383 mutex_unlock(&ctl_mutex
);
3388 static void rbd_bus_del_dev(struct rbd_device
*rbd_dev
)
3390 device_unregister(&rbd_dev
->dev
);
3393 static atomic64_t rbd_dev_id_max
= ATOMIC64_INIT(0);
3396 * Get a unique rbd identifier for the given new rbd_dev, and add
3397 * the rbd_dev to the global list. The minimum rbd id is 1.
3399 static void rbd_dev_id_get(struct rbd_device
*rbd_dev
)
3401 rbd_dev
->dev_id
= atomic64_inc_return(&rbd_dev_id_max
);
3403 spin_lock(&rbd_dev_list_lock
);
3404 list_add_tail(&rbd_dev
->node
, &rbd_dev_list
);
3405 spin_unlock(&rbd_dev_list_lock
);
3406 dout("rbd_dev %p given dev id %llu\n", rbd_dev
,
3407 (unsigned long long) rbd_dev
->dev_id
);
3411 * Remove an rbd_dev from the global list, and record that its
3412 * identifier is no longer in use.
3414 static void rbd_dev_id_put(struct rbd_device
*rbd_dev
)
3416 struct list_head
*tmp
;
3417 int rbd_id
= rbd_dev
->dev_id
;
3420 rbd_assert(rbd_id
> 0);
3422 dout("rbd_dev %p released dev id %llu\n", rbd_dev
,
3423 (unsigned long long) rbd_dev
->dev_id
);
3424 spin_lock(&rbd_dev_list_lock
);
3425 list_del_init(&rbd_dev
->node
);
3428 * If the id being "put" is not the current maximum, there
3429 * is nothing special we need to do.
3431 if (rbd_id
!= atomic64_read(&rbd_dev_id_max
)) {
3432 spin_unlock(&rbd_dev_list_lock
);
3437 * We need to update the current maximum id. Search the
3438 * list to find out what it is. We're more likely to find
3439 * the maximum at the end, so search the list backward.
3442 list_for_each_prev(tmp
, &rbd_dev_list
) {
3443 struct rbd_device
*rbd_dev
;
3445 rbd_dev
= list_entry(tmp
, struct rbd_device
, node
);
3446 if (rbd_dev
->dev_id
> max_id
)
3447 max_id
= rbd_dev
->dev_id
;
3449 spin_unlock(&rbd_dev_list_lock
);
3452 * The max id could have been updated by rbd_dev_id_get(), in
3453 * which case it now accurately reflects the new maximum.
3454 * Be careful not to overwrite the maximum value in that
3457 atomic64_cmpxchg(&rbd_dev_id_max
, rbd_id
, max_id
);
3458 dout(" max dev id has been reset\n");
3462 * Skips over white space at *buf, and updates *buf to point to the
3463 * first found non-space character (if any). Returns the length of
3464 * the token (string of non-white space characters) found. Note
3465 * that *buf must be terminated with '\0'.
3467 static inline size_t next_token(const char **buf
)
3470 * These are the characters that produce nonzero for
3471 * isspace() in the "C" and "POSIX" locales.
3473 const char *spaces
= " \f\n\r\t\v";
3475 *buf
+= strspn(*buf
, spaces
); /* Find start of token */
3477 return strcspn(*buf
, spaces
); /* Return token length */
3481 * Finds the next token in *buf, and if the provided token buffer is
3482 * big enough, copies the found token into it. The result, if
3483 * copied, is guaranteed to be terminated with '\0'. Note that *buf
3484 * must be terminated with '\0' on entry.
3486 * Returns the length of the token found (not including the '\0').
3487 * Return value will be 0 if no token is found, and it will be >=
3488 * token_size if the token would not fit.
3490 * The *buf pointer will be updated to point beyond the end of the
3491 * found token. Note that this occurs even if the token buffer is
3492 * too small to hold it.
3494 static inline size_t copy_token(const char **buf
,
3500 len
= next_token(buf
);
3501 if (len
< token_size
) {
3502 memcpy(token
, *buf
, len
);
3503 *(token
+ len
) = '\0';
3511 * Finds the next token in *buf, dynamically allocates a buffer big
3512 * enough to hold a copy of it, and copies the token into the new
3513 * buffer. The copy is guaranteed to be terminated with '\0'. Note
3514 * that a duplicate buffer is created even for a zero-length token.
3516 * Returns a pointer to the newly-allocated duplicate, or a null
3517 * pointer if memory for the duplicate was not available. If
3518 * the lenp argument is a non-null pointer, the length of the token
3519 * (not including the '\0') is returned in *lenp.
3521 * If successful, the *buf pointer will be updated to point beyond
3522 * the end of the found token.
3524 * Note: uses GFP_KERNEL for allocation.
3526 static inline char *dup_token(const char **buf
, size_t *lenp
)
3531 len
= next_token(buf
);
3532 dup
= kmemdup(*buf
, len
+ 1, GFP_KERNEL
);
3535 *(dup
+ len
) = '\0';
3545 * Parse the options provided for an "rbd add" (i.e., rbd image
3546 * mapping) request. These arrive via a write to /sys/bus/rbd/add,
3547 * and the data written is passed here via a NUL-terminated buffer.
3548 * Returns 0 if successful or an error code otherwise.
3550 * The information extracted from these options is recorded in
3551 * the other parameters which return dynamically-allocated
3554 * The address of a pointer that will refer to a ceph options
3555 * structure. Caller must release the returned pointer using
3556 * ceph_destroy_options() when it is no longer needed.
3558 * Address of an rbd options pointer. Fully initialized by
3559 * this function; caller must release with kfree().
3561 * Address of an rbd image specification pointer. Fully
3562 * initialized by this function based on parsed options.
3563 * Caller must release with rbd_spec_put().
3565 * The options passed take this form:
3566 * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
3569 * A comma-separated list of one or more monitor addresses.
3570 * A monitor address is an ip address, optionally followed
3571 * by a port number (separated by a colon).
3572 * I.e.: ip1[:port1][,ip2[:port2]...]
3574 * A comma-separated list of ceph and/or rbd options.
3576 * The name of the rados pool containing the rbd image.
3578 * The name of the image in that pool to map.
3580 * An optional snapshot id. If provided, the mapping will
3581 * present data from the image at the time that snapshot was
3582 * created. The image head is used if no snapshot id is
3583 * provided. Snapshot mappings are always read-only.
3585 static int rbd_add_parse_args(const char *buf
,
3586 struct ceph_options
**ceph_opts
,
3587 struct rbd_options
**opts
,
3588 struct rbd_spec
**rbd_spec
)
3592 const char *mon_addrs
;
3593 size_t mon_addrs_size
;
3594 struct rbd_spec
*spec
= NULL
;
3595 struct rbd_options
*rbd_opts
= NULL
;
3596 struct ceph_options
*copts
;
3599 /* The first four tokens are required */
3601 len
= next_token(&buf
);
3603 rbd_warn(NULL
, "no monitor address(es) provided");
3607 mon_addrs_size
= len
+ 1;
3611 options
= dup_token(&buf
, NULL
);
3615 rbd_warn(NULL
, "no options provided");
3619 spec
= rbd_spec_alloc();
3623 spec
->pool_name
= dup_token(&buf
, NULL
);
3624 if (!spec
->pool_name
)
3626 if (!*spec
->pool_name
) {
3627 rbd_warn(NULL
, "no pool name provided");
3631 spec
->image_name
= dup_token(&buf
, NULL
);
3632 if (!spec
->image_name
)
3634 if (!*spec
->image_name
) {
3635 rbd_warn(NULL
, "no image name provided");
3640 * Snapshot name is optional; default is to use "-"
3641 * (indicating the head/no snapshot).
3643 len
= next_token(&buf
);
3645 buf
= RBD_SNAP_HEAD_NAME
; /* No snapshot supplied */
3646 len
= sizeof (RBD_SNAP_HEAD_NAME
) - 1;
3647 } else if (len
> RBD_MAX_SNAP_NAME_LEN
) {
3648 ret
= -ENAMETOOLONG
;
3651 spec
->snap_name
= kmemdup(buf
, len
+ 1, GFP_KERNEL
);
3652 if (!spec
->snap_name
)
3654 *(spec
->snap_name
+ len
) = '\0';
3656 /* Initialize all rbd options to the defaults */
3658 rbd_opts
= kzalloc(sizeof (*rbd_opts
), GFP_KERNEL
);
3662 rbd_opts
->read_only
= RBD_READ_ONLY_DEFAULT
;
3664 copts
= ceph_parse_options(options
, mon_addrs
,
3665 mon_addrs
+ mon_addrs_size
- 1,
3666 parse_rbd_opts_token
, rbd_opts
);
3667 if (IS_ERR(copts
)) {
3668 ret
= PTR_ERR(copts
);
3689 * An rbd format 2 image has a unique identifier, distinct from the
3690 * name given to it by the user. Internally, that identifier is
3691 * what's used to specify the names of objects related to the image.
3693 * A special "rbd id" object is used to map an rbd image name to its
3694 * id. If that object doesn't exist, then there is no v2 rbd image
3695 * with the supplied name.
3697 * This function will record the given rbd_dev's image_id field if
3698 * it can be determined, and in that case will return 0. If any
3699 * errors occur a negative errno will be returned and the rbd_dev's
3700 * image_id field will be unchanged (and should be NULL).
3702 static int rbd_dev_image_id(struct rbd_device
*rbd_dev
)
3711 * When probing a parent image, the image id is already
3712 * known (and the image name likely is not). There's no
3713 * need to fetch the image id again in this case.
3715 if (rbd_dev
->spec
->image_id
)
3719 * First, see if the format 2 image id file exists, and if
3720 * so, get the image's persistent id from it.
3722 size
= sizeof (RBD_ID_PREFIX
) + strlen(rbd_dev
->spec
->image_name
);
3723 object_name
= kmalloc(size
, GFP_NOIO
);
3726 sprintf(object_name
, "%s%s", RBD_ID_PREFIX
, rbd_dev
->spec
->image_name
);
3727 dout("rbd id object name is %s\n", object_name
);
3729 /* Response will be an encoded string, which includes a length */
3731 size
= sizeof (__le32
) + RBD_IMAGE_ID_LEN_MAX
;
3732 response
= kzalloc(size
, GFP_NOIO
);
3738 ret
= rbd_obj_method_sync(rbd_dev
, object_name
,
3741 response
, RBD_IMAGE_ID_LEN_MAX
, NULL
);
3742 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3747 rbd_dev
->spec
->image_id
= ceph_extract_encoded_string(&p
,
3748 p
+ RBD_IMAGE_ID_LEN_MAX
,
3750 if (IS_ERR(rbd_dev
->spec
->image_id
)) {
3751 ret
= PTR_ERR(rbd_dev
->spec
->image_id
);
3752 rbd_dev
->spec
->image_id
= NULL
;
3754 dout("image_id is %s\n", rbd_dev
->spec
->image_id
);
3763 static int rbd_dev_v1_probe(struct rbd_device
*rbd_dev
)
3768 /* Version 1 images have no id; empty string is used */
3770 rbd_dev
->spec
->image_id
= kstrdup("", GFP_KERNEL
);
3771 if (!rbd_dev
->spec
->image_id
)
3774 /* Record the header object name for this rbd image. */
3776 size
= strlen(rbd_dev
->spec
->image_name
) + sizeof (RBD_SUFFIX
);
3777 rbd_dev
->header_name
= kmalloc(size
, GFP_KERNEL
);
3778 if (!rbd_dev
->header_name
) {
3782 sprintf(rbd_dev
->header_name
, "%s%s",
3783 rbd_dev
->spec
->image_name
, RBD_SUFFIX
);
3785 /* Populate rbd image metadata */
3787 ret
= rbd_read_header(rbd_dev
, &rbd_dev
->header
);
3791 /* Version 1 images have no parent (no layering) */
3793 rbd_dev
->parent_spec
= NULL
;
3794 rbd_dev
->parent_overlap
= 0;
3796 rbd_dev
->image_format
= 1;
3798 dout("discovered version 1 image, header name is %s\n",
3799 rbd_dev
->header_name
);
3804 kfree(rbd_dev
->header_name
);
3805 rbd_dev
->header_name
= NULL
;
3806 kfree(rbd_dev
->spec
->image_id
);
3807 rbd_dev
->spec
->image_id
= NULL
;
3812 static int rbd_dev_v2_probe(struct rbd_device
*rbd_dev
)
3819 * Image id was filled in by the caller. Record the header
3820 * object name for this rbd image.
3822 size
= sizeof (RBD_HEADER_PREFIX
) + strlen(rbd_dev
->spec
->image_id
);
3823 rbd_dev
->header_name
= kmalloc(size
, GFP_KERNEL
);
3824 if (!rbd_dev
->header_name
)
3826 sprintf(rbd_dev
->header_name
, "%s%s",
3827 RBD_HEADER_PREFIX
, rbd_dev
->spec
->image_id
);
3829 /* Get the size and object order for the image */
3831 ret
= rbd_dev_v2_image_size(rbd_dev
);
3835 /* Get the object prefix (a.k.a. block_name) for the image */
3837 ret
= rbd_dev_v2_object_prefix(rbd_dev
);
3841 /* Get the and check features for the image */
3843 ret
= rbd_dev_v2_features(rbd_dev
);
3847 /* If the image supports layering, get the parent info */
3849 if (rbd_dev
->header
.features
& RBD_FEATURE_LAYERING
) {
3850 ret
= rbd_dev_v2_parent_info(rbd_dev
);
3855 /* crypto and compression type aren't (yet) supported for v2 images */
3857 rbd_dev
->header
.crypt_type
= 0;
3858 rbd_dev
->header
.comp_type
= 0;
3860 /* Get the snapshot context, plus the header version */
3862 ret
= rbd_dev_v2_snap_context(rbd_dev
, &ver
);
3865 rbd_dev
->header
.obj_version
= ver
;
3867 rbd_dev
->image_format
= 2;
3869 dout("discovered version 2 image, header name is %s\n",
3870 rbd_dev
->header_name
);
3874 rbd_dev
->parent_overlap
= 0;
3875 rbd_spec_put(rbd_dev
->parent_spec
);
3876 rbd_dev
->parent_spec
= NULL
;
3877 kfree(rbd_dev
->header_name
);
3878 rbd_dev
->header_name
= NULL
;
3879 kfree(rbd_dev
->header
.object_prefix
);
3880 rbd_dev
->header
.object_prefix
= NULL
;
3885 static int rbd_dev_probe_finish(struct rbd_device
*rbd_dev
)
3889 /* no need to lock here, as rbd_dev is not registered yet */
3890 ret
= rbd_dev_snaps_update(rbd_dev
);
3894 ret
= rbd_dev_probe_update_spec(rbd_dev
);
3898 ret
= rbd_dev_set_mapping(rbd_dev
);
3902 /* generate unique id: find highest unique id, add one */
3903 rbd_dev_id_get(rbd_dev
);
3905 /* Fill in the device name, now that we have its id. */
3906 BUILD_BUG_ON(DEV_NAME_LEN
3907 < sizeof (RBD_DRV_NAME
) + MAX_INT_FORMAT_WIDTH
);
3908 sprintf(rbd_dev
->name
, "%s%d", RBD_DRV_NAME
, rbd_dev
->dev_id
);
3910 /* Get our block major device number. */
3912 ret
= register_blkdev(0, rbd_dev
->name
);
3915 rbd_dev
->major
= ret
;
3917 /* Set up the blkdev mapping. */
3919 ret
= rbd_init_disk(rbd_dev
);
3921 goto err_out_blkdev
;
3923 ret
= rbd_bus_add_dev(rbd_dev
);
3928 * At this point cleanup in the event of an error is the job
3929 * of the sysfs code (initiated by rbd_bus_del_dev()).
3931 down_write(&rbd_dev
->header_rwsem
);
3932 ret
= rbd_dev_snaps_register(rbd_dev
);
3933 up_write(&rbd_dev
->header_rwsem
);
3937 ret
= rbd_dev_header_watch_sync(rbd_dev
, 1);
3941 /* Everything's ready. Announce the disk to the world. */
3943 add_disk(rbd_dev
->disk
);
3945 pr_info("%s: added with size 0x%llx\n", rbd_dev
->disk
->disk_name
,
3946 (unsigned long long) rbd_dev
->mapping
.size
);
3950 /* this will also clean up rest of rbd_dev stuff */
3952 rbd_bus_del_dev(rbd_dev
);
3956 rbd_free_disk(rbd_dev
);
3958 unregister_blkdev(rbd_dev
->major
, rbd_dev
->name
);
3960 rbd_dev_id_put(rbd_dev
);
3962 rbd_remove_all_snaps(rbd_dev
);
3968 * Probe for the existence of the header object for the given rbd
3969 * device. For format 2 images this includes determining the image
3972 static int rbd_dev_probe(struct rbd_device
*rbd_dev
)
3977 * Get the id from the image id object. If it's not a
3978 * format 2 image, we'll get ENOENT back, and we'll assume
3979 * it's a format 1 image.
3981 ret
= rbd_dev_image_id(rbd_dev
);
3983 ret
= rbd_dev_v1_probe(rbd_dev
);
3985 ret
= rbd_dev_v2_probe(rbd_dev
);
3987 dout("probe failed, returning %d\n", ret
);
3992 ret
= rbd_dev_probe_finish(rbd_dev
);
3994 rbd_header_free(&rbd_dev
->header
);
3999 static ssize_t
rbd_add(struct bus_type
*bus
,
4003 struct rbd_device
*rbd_dev
= NULL
;
4004 struct ceph_options
*ceph_opts
= NULL
;
4005 struct rbd_options
*rbd_opts
= NULL
;
4006 struct rbd_spec
*spec
= NULL
;
4007 struct rbd_client
*rbdc
;
4008 struct ceph_osd_client
*osdc
;
4011 if (!try_module_get(THIS_MODULE
))
4014 /* parse add command */
4015 rc
= rbd_add_parse_args(buf
, &ceph_opts
, &rbd_opts
, &spec
);
4017 goto err_out_module
;
4019 rbdc
= rbd_get_client(ceph_opts
);
4024 ceph_opts
= NULL
; /* rbd_dev client now owns this */
4027 osdc
= &rbdc
->client
->osdc
;
4028 rc
= ceph_pg_poolid_by_name(osdc
->osdmap
, spec
->pool_name
);
4030 goto err_out_client
;
4031 spec
->pool_id
= (u64
) rc
;
4033 /* The ceph file layout needs to fit pool id in 32 bits */
4035 if (WARN_ON(spec
->pool_id
> (u64
) U32_MAX
)) {
4037 goto err_out_client
;
4040 rbd_dev
= rbd_dev_create(rbdc
, spec
);
4042 goto err_out_client
;
4043 rbdc
= NULL
; /* rbd_dev now owns this */
4044 spec
= NULL
; /* rbd_dev now owns this */
4046 rbd_dev
->mapping
.read_only
= rbd_opts
->read_only
;
4048 rbd_opts
= NULL
; /* done with this */
4050 rc
= rbd_dev_probe(rbd_dev
);
4052 goto err_out_rbd_dev
;
4056 rbd_dev_destroy(rbd_dev
);
4058 rbd_put_client(rbdc
);
4061 ceph_destroy_options(ceph_opts
);
4065 module_put(THIS_MODULE
);
4067 dout("Error adding device %s\n", buf
);
4069 return (ssize_t
) rc
;
4072 static struct rbd_device
*__rbd_get_dev(unsigned long dev_id
)
4074 struct list_head
*tmp
;
4075 struct rbd_device
*rbd_dev
;
4077 spin_lock(&rbd_dev_list_lock
);
4078 list_for_each(tmp
, &rbd_dev_list
) {
4079 rbd_dev
= list_entry(tmp
, struct rbd_device
, node
);
4080 if (rbd_dev
->dev_id
== dev_id
) {
4081 spin_unlock(&rbd_dev_list_lock
);
4085 spin_unlock(&rbd_dev_list_lock
);
4089 static void rbd_dev_release(struct device
*dev
)
4091 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
4093 if (rbd_dev
->watch_event
)
4094 rbd_dev_header_watch_sync(rbd_dev
, 0);
4096 /* clean up and free blkdev */
4097 rbd_free_disk(rbd_dev
);
4098 unregister_blkdev(rbd_dev
->major
, rbd_dev
->name
);
4100 /* release allocated disk header fields */
4101 rbd_header_free(&rbd_dev
->header
);
4103 /* done with the id, and with the rbd_dev */
4104 rbd_dev_id_put(rbd_dev
);
4105 rbd_assert(rbd_dev
->rbd_client
!= NULL
);
4106 rbd_dev_destroy(rbd_dev
);
4108 /* release module ref */
4109 module_put(THIS_MODULE
);
4112 static ssize_t
rbd_remove(struct bus_type
*bus
,
4116 struct rbd_device
*rbd_dev
= NULL
;
4121 rc
= strict_strtoul(buf
, 10, &ul
);
4125 /* convert to int; abort if we lost anything in the conversion */
4126 target_id
= (int) ul
;
4127 if (target_id
!= ul
)
4130 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
4132 rbd_dev
= __rbd_get_dev(target_id
);
4138 spin_lock_irq(&rbd_dev
->lock
);
4139 if (rbd_dev
->open_count
)
4142 set_bit(RBD_DEV_FLAG_REMOVING
, &rbd_dev
->flags
);
4143 spin_unlock_irq(&rbd_dev
->lock
);
4147 rbd_remove_all_snaps(rbd_dev
);
4148 rbd_bus_del_dev(rbd_dev
);
4151 mutex_unlock(&ctl_mutex
);
4157 * create control files in sysfs
4160 static int rbd_sysfs_init(void)
4164 ret
= device_register(&rbd_root_dev
);
4168 ret
= bus_register(&rbd_bus_type
);
4170 device_unregister(&rbd_root_dev
);
4175 static void rbd_sysfs_cleanup(void)
4177 bus_unregister(&rbd_bus_type
);
4178 device_unregister(&rbd_root_dev
);
4181 int __init
rbd_init(void)
4185 if (!libceph_compatible(NULL
)) {
4186 rbd_warn(NULL
, "libceph incompatibility (quitting)");
4190 rc
= rbd_sysfs_init();
4193 pr_info("loaded " RBD_DRV_NAME_LONG
"\n");
4197 void __exit
rbd_exit(void)
4199 rbd_sysfs_cleanup();
4202 module_init(rbd_init
);
4203 module_exit(rbd_exit
);
4205 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
4206 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
4207 MODULE_DESCRIPTION("rados block device");
4209 /* following authorship retained from original osdblk.c */
4210 MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
4212 MODULE_LICENSE("GPL");