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 #define RBD_DRV_NAME "rbd"
56 #define RBD_DRV_NAME_LONG "rbd (rados block device)"
58 #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */
60 #define RBD_SNAP_DEV_NAME_PREFIX "snap_"
61 #define RBD_MAX_SNAP_NAME_LEN \
62 (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
64 #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */
66 #define RBD_SNAP_HEAD_NAME "-"
68 /* This allows a single page to hold an image name sent by OSD */
69 #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
70 #define RBD_IMAGE_ID_LEN_MAX 64
72 #define RBD_OBJ_PREFIX_LEN_MAX 64
76 #define RBD_FEATURE_LAYERING 1
78 /* Features supported by this (client software) implementation. */
80 #define RBD_FEATURES_ALL (0)
83 * An RBD device name will be "rbd#", where the "rbd" comes from
84 * RBD_DRV_NAME above, and # is a unique integer identifier.
85 * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
86 * enough to hold all possible device names.
88 #define DEV_NAME_LEN 32
89 #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
92 * block device image metadata (in-memory version)
94 struct rbd_image_header
{
95 /* These four fields never change for a given rbd image */
102 /* The remaining fields need to be updated occasionally */
104 struct ceph_snap_context
*snapc
;
112 * An rbd image specification.
114 * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
115 * identify an image. Each rbd_dev structure includes a pointer to
116 * an rbd_spec structure that encapsulates this identity.
118 * Each of the id's in an rbd_spec has an associated name. For a
119 * user-mapped image, the names are supplied and the id's associated
120 * with them are looked up. For a layered image, a parent image is
121 * defined by the tuple, and the names are looked up.
123 * An rbd_dev structure contains a parent_spec pointer which is
124 * non-null if the image it represents is a child in a layered
125 * image. This pointer will refer to the rbd_spec structure used
126 * by the parent rbd_dev for its own identity (i.e., the structure
127 * is shared between the parent and child).
129 * Since these structures are populated once, during the discovery
130 * phase of image construction, they are effectively immutable so
131 * we make no effort to synchronize access to them.
133 * Note that code herein does not assume the image name is known (it
134 * could be a null pointer).
150 * an instance of the client. multiple devices may share an rbd client.
153 struct ceph_client
*client
;
155 struct list_head node
;
158 struct rbd_img_request
;
159 typedef void (*rbd_img_callback_t
)(struct rbd_img_request
*);
161 #define BAD_WHICH U32_MAX /* Good which or bad which, which? */
163 struct rbd_obj_request
;
164 typedef void (*rbd_obj_callback_t
)(struct rbd_obj_request
*);
166 enum obj_request_type
{
167 OBJ_REQUEST_NODATA
, OBJ_REQUEST_BIO
, OBJ_REQUEST_PAGES
170 struct rbd_obj_request
{
171 const char *object_name
;
172 u64 offset
; /* object start byte */
173 u64 length
; /* bytes from offset */
175 struct rbd_img_request
*img_request
;
176 struct list_head links
; /* img_request->obj_requests */
177 u32 which
; /* posn image request list */
179 enum obj_request_type type
;
181 struct bio
*bio_list
;
188 struct ceph_osd_request
*osd_req
;
190 u64 xferred
; /* bytes transferred */
195 rbd_obj_callback_t callback
;
196 struct completion completion
;
201 struct rbd_img_request
{
203 struct rbd_device
*rbd_dev
;
204 u64 offset
; /* starting image byte offset */
205 u64 length
; /* byte count from offset */
206 bool write_request
; /* false for read */
208 struct ceph_snap_context
*snapc
; /* for writes */
209 u64 snap_id
; /* for reads */
211 spinlock_t completion_lock
;/* protects next_completion */
213 rbd_img_callback_t callback
;
215 u32 obj_request_count
;
216 struct list_head obj_requests
; /* rbd_obj_request structs */
221 #define for_each_obj_request(ireq, oreq) \
222 list_for_each_entry(oreq, &(ireq)->obj_requests, links)
223 #define for_each_obj_request_from(ireq, oreq) \
224 list_for_each_entry_from(oreq, &(ireq)->obj_requests, links)
225 #define for_each_obj_request_safe(ireq, oreq, n) \
226 list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
232 struct list_head node
;
247 int dev_id
; /* blkdev unique id */
249 int major
; /* blkdev assigned major */
250 struct gendisk
*disk
; /* blkdev's gendisk and rq */
252 u32 image_format
; /* Either 1 or 2 */
253 struct rbd_client
*rbd_client
;
255 char name
[DEV_NAME_LEN
]; /* blkdev name, e.g. rbd3 */
257 spinlock_t lock
; /* queue, flags, open_count */
259 struct rbd_image_header header
;
260 unsigned long flags
; /* possibly lock protected */
261 struct rbd_spec
*spec
;
265 struct ceph_file_layout layout
;
267 struct ceph_osd_event
*watch_event
;
268 struct rbd_obj_request
*watch_request
;
270 struct rbd_spec
*parent_spec
;
273 /* protects updating the header */
274 struct rw_semaphore header_rwsem
;
276 struct rbd_mapping mapping
;
278 struct list_head node
;
280 /* list of snapshots */
281 struct list_head snaps
;
285 unsigned long open_count
; /* protected by lock */
289 * Flag bits for rbd_dev->flags. If atomicity is required,
290 * rbd_dev->lock is used to protect access.
292 * Currently, only the "removing" flag (which is coupled with the
293 * "open_count" field) requires atomic access.
296 RBD_DEV_FLAG_EXISTS
, /* mapped snapshot has not been deleted */
297 RBD_DEV_FLAG_REMOVING
, /* this mapping is being removed */
300 static DEFINE_MUTEX(ctl_mutex
); /* Serialize open/close/setup/teardown */
302 static LIST_HEAD(rbd_dev_list
); /* devices */
303 static DEFINE_SPINLOCK(rbd_dev_list_lock
);
305 static LIST_HEAD(rbd_client_list
); /* clients */
306 static DEFINE_SPINLOCK(rbd_client_list_lock
);
308 static int rbd_dev_snaps_update(struct rbd_device
*rbd_dev
);
309 static int rbd_dev_snaps_register(struct rbd_device
*rbd_dev
);
311 static void rbd_dev_release(struct device
*dev
);
312 static void rbd_remove_snap_dev(struct rbd_snap
*snap
);
314 static ssize_t
rbd_add(struct bus_type
*bus
, const char *buf
,
316 static ssize_t
rbd_remove(struct bus_type
*bus
, const char *buf
,
319 static struct bus_attribute rbd_bus_attrs
[] = {
320 __ATTR(add
, S_IWUSR
, NULL
, rbd_add
),
321 __ATTR(remove
, S_IWUSR
, NULL
, rbd_remove
),
325 static struct bus_type rbd_bus_type
= {
327 .bus_attrs
= rbd_bus_attrs
,
330 static void rbd_root_dev_release(struct device
*dev
)
334 static struct device rbd_root_dev
= {
336 .release
= rbd_root_dev_release
,
339 static __printf(2, 3)
340 void rbd_warn(struct rbd_device
*rbd_dev
, const char *fmt
, ...)
342 struct va_format vaf
;
350 printk(KERN_WARNING
"%s: %pV\n", RBD_DRV_NAME
, &vaf
);
351 else if (rbd_dev
->disk
)
352 printk(KERN_WARNING
"%s: %s: %pV\n",
353 RBD_DRV_NAME
, rbd_dev
->disk
->disk_name
, &vaf
);
354 else if (rbd_dev
->spec
&& rbd_dev
->spec
->image_name
)
355 printk(KERN_WARNING
"%s: image %s: %pV\n",
356 RBD_DRV_NAME
, rbd_dev
->spec
->image_name
, &vaf
);
357 else if (rbd_dev
->spec
&& rbd_dev
->spec
->image_id
)
358 printk(KERN_WARNING
"%s: id %s: %pV\n",
359 RBD_DRV_NAME
, rbd_dev
->spec
->image_id
, &vaf
);
361 printk(KERN_WARNING
"%s: rbd_dev %p: %pV\n",
362 RBD_DRV_NAME
, rbd_dev
, &vaf
);
367 #define rbd_assert(expr) \
368 if (unlikely(!(expr))) { \
369 printk(KERN_ERR "\nAssertion failure in %s() " \
371 "\trbd_assert(%s);\n\n", \
372 __func__, __LINE__, #expr); \
375 #else /* !RBD_DEBUG */
376 # define rbd_assert(expr) ((void) 0)
377 #endif /* !RBD_DEBUG */
379 static int rbd_dev_refresh(struct rbd_device
*rbd_dev
, u64
*hver
);
380 static int rbd_dev_v2_refresh(struct rbd_device
*rbd_dev
, u64
*hver
);
382 static int rbd_open(struct block_device
*bdev
, fmode_t mode
)
384 struct rbd_device
*rbd_dev
= bdev
->bd_disk
->private_data
;
385 bool removing
= false;
387 if ((mode
& FMODE_WRITE
) && rbd_dev
->mapping
.read_only
)
390 spin_lock_irq(&rbd_dev
->lock
);
391 if (test_bit(RBD_DEV_FLAG_REMOVING
, &rbd_dev
->flags
))
394 rbd_dev
->open_count
++;
395 spin_unlock_irq(&rbd_dev
->lock
);
399 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
400 (void) get_device(&rbd_dev
->dev
);
401 set_device_ro(bdev
, rbd_dev
->mapping
.read_only
);
402 mutex_unlock(&ctl_mutex
);
407 static int rbd_release(struct gendisk
*disk
, fmode_t mode
)
409 struct rbd_device
*rbd_dev
= disk
->private_data
;
410 unsigned long open_count_before
;
412 spin_lock_irq(&rbd_dev
->lock
);
413 open_count_before
= rbd_dev
->open_count
--;
414 spin_unlock_irq(&rbd_dev
->lock
);
415 rbd_assert(open_count_before
> 0);
417 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
418 put_device(&rbd_dev
->dev
);
419 mutex_unlock(&ctl_mutex
);
424 static const struct block_device_operations rbd_bd_ops
= {
425 .owner
= THIS_MODULE
,
427 .release
= rbd_release
,
431 * Initialize an rbd client instance.
434 static struct rbd_client
*rbd_client_create(struct ceph_options
*ceph_opts
)
436 struct rbd_client
*rbdc
;
439 dout("%s:\n", __func__
);
440 rbdc
= kmalloc(sizeof(struct rbd_client
), GFP_KERNEL
);
444 kref_init(&rbdc
->kref
);
445 INIT_LIST_HEAD(&rbdc
->node
);
447 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
449 rbdc
->client
= ceph_create_client(ceph_opts
, rbdc
, 0, 0);
450 if (IS_ERR(rbdc
->client
))
452 ceph_opts
= NULL
; /* Now rbdc->client is responsible for ceph_opts */
454 ret
= ceph_open_session(rbdc
->client
);
458 spin_lock(&rbd_client_list_lock
);
459 list_add_tail(&rbdc
->node
, &rbd_client_list
);
460 spin_unlock(&rbd_client_list_lock
);
462 mutex_unlock(&ctl_mutex
);
463 dout("%s: rbdc %p\n", __func__
, rbdc
);
468 ceph_destroy_client(rbdc
->client
);
470 mutex_unlock(&ctl_mutex
);
474 ceph_destroy_options(ceph_opts
);
475 dout("%s: error %d\n", __func__
, ret
);
481 * Find a ceph client with specific addr and configuration. If
482 * found, bump its reference count.
484 static struct rbd_client
*rbd_client_find(struct ceph_options
*ceph_opts
)
486 struct rbd_client
*client_node
;
489 if (ceph_opts
->flags
& CEPH_OPT_NOSHARE
)
492 spin_lock(&rbd_client_list_lock
);
493 list_for_each_entry(client_node
, &rbd_client_list
, node
) {
494 if (!ceph_compare_options(ceph_opts
, client_node
->client
)) {
495 kref_get(&client_node
->kref
);
500 spin_unlock(&rbd_client_list_lock
);
502 return found
? client_node
: NULL
;
512 /* string args above */
515 /* Boolean args above */
519 static match_table_t rbd_opts_tokens
= {
521 /* string args above */
522 {Opt_read_only
, "read_only"},
523 {Opt_read_only
, "ro"}, /* Alternate spelling */
524 {Opt_read_write
, "read_write"},
525 {Opt_read_write
, "rw"}, /* Alternate spelling */
526 /* Boolean args above */
534 #define RBD_READ_ONLY_DEFAULT false
536 static int parse_rbd_opts_token(char *c
, void *private)
538 struct rbd_options
*rbd_opts
= private;
539 substring_t argstr
[MAX_OPT_ARGS
];
540 int token
, intval
, ret
;
542 token
= match_token(c
, rbd_opts_tokens
, argstr
);
546 if (token
< Opt_last_int
) {
547 ret
= match_int(&argstr
[0], &intval
);
549 pr_err("bad mount option arg (not int) "
553 dout("got int token %d val %d\n", token
, intval
);
554 } else if (token
> Opt_last_int
&& token
< Opt_last_string
) {
555 dout("got string token %d val %s\n", token
,
557 } else if (token
> Opt_last_string
&& token
< Opt_last_bool
) {
558 dout("got Boolean token %d\n", token
);
560 dout("got token %d\n", token
);
565 rbd_opts
->read_only
= true;
568 rbd_opts
->read_only
= false;
578 * Get a ceph client with specific addr and configuration, if one does
579 * not exist create it.
581 static struct rbd_client
*rbd_get_client(struct ceph_options
*ceph_opts
)
583 struct rbd_client
*rbdc
;
585 rbdc
= rbd_client_find(ceph_opts
);
586 if (rbdc
) /* using an existing client */
587 ceph_destroy_options(ceph_opts
);
589 rbdc
= rbd_client_create(ceph_opts
);
595 * Destroy ceph client
597 * Caller must hold rbd_client_list_lock.
599 static void rbd_client_release(struct kref
*kref
)
601 struct rbd_client
*rbdc
= container_of(kref
, struct rbd_client
, kref
);
603 dout("%s: rbdc %p\n", __func__
, rbdc
);
604 spin_lock(&rbd_client_list_lock
);
605 list_del(&rbdc
->node
);
606 spin_unlock(&rbd_client_list_lock
);
608 ceph_destroy_client(rbdc
->client
);
613 * Drop reference to ceph client node. If it's not referenced anymore, release
616 static void rbd_put_client(struct rbd_client
*rbdc
)
619 kref_put(&rbdc
->kref
, rbd_client_release
);
622 static bool rbd_image_format_valid(u32 image_format
)
624 return image_format
== 1 || image_format
== 2;
627 static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk
*ondisk
)
632 /* The header has to start with the magic rbd header text */
633 if (memcmp(&ondisk
->text
, RBD_HEADER_TEXT
, sizeof (RBD_HEADER_TEXT
)))
636 /* The bio layer requires at least sector-sized I/O */
638 if (ondisk
->options
.order
< SECTOR_SHIFT
)
641 /* If we use u64 in a few spots we may be able to loosen this */
643 if (ondisk
->options
.order
> 8 * sizeof (int) - 1)
647 * The size of a snapshot header has to fit in a size_t, and
648 * that limits the number of snapshots.
650 snap_count
= le32_to_cpu(ondisk
->snap_count
);
651 size
= SIZE_MAX
- sizeof (struct ceph_snap_context
);
652 if (snap_count
> size
/ sizeof (__le64
))
656 * Not only that, but the size of the entire the snapshot
657 * header must also be representable in a size_t.
659 size
-= snap_count
* sizeof (__le64
);
660 if ((u64
) size
< le64_to_cpu(ondisk
->snap_names_len
))
667 * Create a new header structure, translate header format from the on-disk
670 static int rbd_header_from_disk(struct rbd_image_header
*header
,
671 struct rbd_image_header_ondisk
*ondisk
)
678 memset(header
, 0, sizeof (*header
));
680 snap_count
= le32_to_cpu(ondisk
->snap_count
);
682 len
= strnlen(ondisk
->object_prefix
, sizeof (ondisk
->object_prefix
));
683 header
->object_prefix
= kmalloc(len
+ 1, GFP_KERNEL
);
684 if (!header
->object_prefix
)
686 memcpy(header
->object_prefix
, ondisk
->object_prefix
, len
);
687 header
->object_prefix
[len
] = '\0';
690 u64 snap_names_len
= le64_to_cpu(ondisk
->snap_names_len
);
692 /* Save a copy of the snapshot names */
694 if (snap_names_len
> (u64
) SIZE_MAX
)
696 header
->snap_names
= kmalloc(snap_names_len
, GFP_KERNEL
);
697 if (!header
->snap_names
)
700 * Note that rbd_dev_v1_header_read() guarantees
701 * the ondisk buffer we're working with has
702 * snap_names_len bytes beyond the end of the
703 * snapshot id array, this memcpy() is safe.
705 memcpy(header
->snap_names
, &ondisk
->snaps
[snap_count
],
708 /* Record each snapshot's size */
710 size
= snap_count
* sizeof (*header
->snap_sizes
);
711 header
->snap_sizes
= kmalloc(size
, GFP_KERNEL
);
712 if (!header
->snap_sizes
)
714 for (i
= 0; i
< snap_count
; i
++)
715 header
->snap_sizes
[i
] =
716 le64_to_cpu(ondisk
->snaps
[i
].image_size
);
718 WARN_ON(ondisk
->snap_names_len
);
719 header
->snap_names
= NULL
;
720 header
->snap_sizes
= NULL
;
723 header
->features
= 0; /* No features support in v1 images */
724 header
->obj_order
= ondisk
->options
.order
;
725 header
->crypt_type
= ondisk
->options
.crypt_type
;
726 header
->comp_type
= ondisk
->options
.comp_type
;
728 /* Allocate and fill in the snapshot context */
730 header
->image_size
= le64_to_cpu(ondisk
->image_size
);
731 size
= sizeof (struct ceph_snap_context
);
732 size
+= snap_count
* sizeof (header
->snapc
->snaps
[0]);
733 header
->snapc
= kzalloc(size
, GFP_KERNEL
);
737 atomic_set(&header
->snapc
->nref
, 1);
738 header
->snapc
->seq
= le64_to_cpu(ondisk
->snap_seq
);
739 header
->snapc
->num_snaps
= snap_count
;
740 for (i
= 0; i
< snap_count
; i
++)
741 header
->snapc
->snaps
[i
] =
742 le64_to_cpu(ondisk
->snaps
[i
].id
);
747 kfree(header
->snap_sizes
);
748 header
->snap_sizes
= NULL
;
749 kfree(header
->snap_names
);
750 header
->snap_names
= NULL
;
751 kfree(header
->object_prefix
);
752 header
->object_prefix
= NULL
;
757 static const char *rbd_snap_name(struct rbd_device
*rbd_dev
, u64 snap_id
)
759 struct rbd_snap
*snap
;
761 if (snap_id
== CEPH_NOSNAP
)
762 return RBD_SNAP_HEAD_NAME
;
764 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
)
765 if (snap_id
== snap
->id
)
771 static int snap_by_name(struct rbd_device
*rbd_dev
, const char *snap_name
)
774 struct rbd_snap
*snap
;
776 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
) {
777 if (!strcmp(snap_name
, snap
->name
)) {
778 rbd_dev
->spec
->snap_id
= snap
->id
;
779 rbd_dev
->mapping
.size
= snap
->size
;
780 rbd_dev
->mapping
.features
= snap
->features
;
789 static int rbd_dev_set_mapping(struct rbd_device
*rbd_dev
)
793 if (!memcmp(rbd_dev
->spec
->snap_name
, RBD_SNAP_HEAD_NAME
,
794 sizeof (RBD_SNAP_HEAD_NAME
))) {
795 rbd_dev
->spec
->snap_id
= CEPH_NOSNAP
;
796 rbd_dev
->mapping
.size
= rbd_dev
->header
.image_size
;
797 rbd_dev
->mapping
.features
= rbd_dev
->header
.features
;
800 ret
= snap_by_name(rbd_dev
, rbd_dev
->spec
->snap_name
);
803 rbd_dev
->mapping
.read_only
= true;
805 set_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
);
811 static void rbd_header_free(struct rbd_image_header
*header
)
813 kfree(header
->object_prefix
);
814 header
->object_prefix
= NULL
;
815 kfree(header
->snap_sizes
);
816 header
->snap_sizes
= NULL
;
817 kfree(header
->snap_names
);
818 header
->snap_names
= NULL
;
819 ceph_put_snap_context(header
->snapc
);
820 header
->snapc
= NULL
;
823 static const char *rbd_segment_name(struct rbd_device
*rbd_dev
, u64 offset
)
829 name
= kmalloc(MAX_OBJ_NAME_SIZE
+ 1, GFP_NOIO
);
832 segment
= offset
>> rbd_dev
->header
.obj_order
;
833 ret
= snprintf(name
, MAX_OBJ_NAME_SIZE
+ 1, "%s.%012llx",
834 rbd_dev
->header
.object_prefix
, segment
);
835 if (ret
< 0 || ret
> MAX_OBJ_NAME_SIZE
) {
836 pr_err("error formatting segment name for #%llu (%d)\n",
845 static u64
rbd_segment_offset(struct rbd_device
*rbd_dev
, u64 offset
)
847 u64 segment_size
= (u64
) 1 << rbd_dev
->header
.obj_order
;
849 return offset
& (segment_size
- 1);
852 static u64
rbd_segment_length(struct rbd_device
*rbd_dev
,
853 u64 offset
, u64 length
)
855 u64 segment_size
= (u64
) 1 << rbd_dev
->header
.obj_order
;
857 offset
&= segment_size
- 1;
859 rbd_assert(length
<= U64_MAX
- offset
);
860 if (offset
+ length
> segment_size
)
861 length
= segment_size
- offset
;
867 * returns the size of an object in the image
869 static u64
rbd_obj_bytes(struct rbd_image_header
*header
)
871 return 1 << header
->obj_order
;
878 static void bio_chain_put(struct bio
*chain
)
884 chain
= chain
->bi_next
;
890 * zeros a bio chain, starting at specific offset
892 static void zero_bio_chain(struct bio
*chain
, int start_ofs
)
901 bio_for_each_segment(bv
, chain
, i
) {
902 if (pos
+ bv
->bv_len
> start_ofs
) {
903 int remainder
= max(start_ofs
- pos
, 0);
904 buf
= bvec_kmap_irq(bv
, &flags
);
905 memset(buf
+ remainder
, 0,
906 bv
->bv_len
- remainder
);
907 bvec_kunmap_irq(buf
, &flags
);
912 chain
= chain
->bi_next
;
917 * Clone a portion of a bio, starting at the given byte offset
918 * and continuing for the number of bytes indicated.
920 static struct bio
*bio_clone_range(struct bio
*bio_src
,
929 unsigned short end_idx
;
933 /* Handle the easy case for the caller */
935 if (!offset
&& len
== bio_src
->bi_size
)
936 return bio_clone(bio_src
, gfpmask
);
938 if (WARN_ON_ONCE(!len
))
940 if (WARN_ON_ONCE(len
> bio_src
->bi_size
))
942 if (WARN_ON_ONCE(offset
> bio_src
->bi_size
- len
))
945 /* Find first affected segment... */
948 __bio_for_each_segment(bv
, bio_src
, idx
, 0) {
949 if (resid
< bv
->bv_len
)
955 /* ...and the last affected segment */
958 __bio_for_each_segment(bv
, bio_src
, end_idx
, idx
) {
959 if (resid
<= bv
->bv_len
)
963 vcnt
= end_idx
- idx
+ 1;
965 /* Build the clone */
967 bio
= bio_alloc(gfpmask
, (unsigned int) vcnt
);
969 return NULL
; /* ENOMEM */
971 bio
->bi_bdev
= bio_src
->bi_bdev
;
972 bio
->bi_sector
= bio_src
->bi_sector
+ (offset
>> SECTOR_SHIFT
);
973 bio
->bi_rw
= bio_src
->bi_rw
;
974 bio
->bi_flags
|= 1 << BIO_CLONED
;
977 * Copy over our part of the bio_vec, then update the first
978 * and last (or only) entries.
980 memcpy(&bio
->bi_io_vec
[0], &bio_src
->bi_io_vec
[idx
],
981 vcnt
* sizeof (struct bio_vec
));
982 bio
->bi_io_vec
[0].bv_offset
+= voff
;
984 bio
->bi_io_vec
[0].bv_len
-= voff
;
985 bio
->bi_io_vec
[vcnt
- 1].bv_len
= resid
;
987 bio
->bi_io_vec
[0].bv_len
= len
;
998 * Clone a portion of a bio chain, starting at the given byte offset
999 * into the first bio in the source chain and continuing for the
1000 * number of bytes indicated. The result is another bio chain of
1001 * exactly the given length, or a null pointer on error.
1003 * The bio_src and offset parameters are both in-out. On entry they
1004 * refer to the first source bio and the offset into that bio where
1005 * the start of data to be cloned is located.
1007 * On return, bio_src is updated to refer to the bio in the source
1008 * chain that contains first un-cloned byte, and *offset will
1009 * contain the offset of that byte within that bio.
1011 static struct bio
*bio_chain_clone_range(struct bio
**bio_src
,
1012 unsigned int *offset
,
1016 struct bio
*bi
= *bio_src
;
1017 unsigned int off
= *offset
;
1018 struct bio
*chain
= NULL
;
1021 /* Build up a chain of clone bios up to the limit */
1023 if (!bi
|| off
>= bi
->bi_size
|| !len
)
1024 return NULL
; /* Nothing to clone */
1028 unsigned int bi_size
;
1032 rbd_warn(NULL
, "bio_chain exhausted with %u left", len
);
1033 goto out_err
; /* EINVAL; ran out of bio's */
1035 bi_size
= min_t(unsigned int, bi
->bi_size
- off
, len
);
1036 bio
= bio_clone_range(bi
, off
, bi_size
, gfpmask
);
1038 goto out_err
; /* ENOMEM */
1041 end
= &bio
->bi_next
;
1044 if (off
== bi
->bi_size
) {
1055 bio_chain_put(chain
);
1060 static void rbd_obj_request_get(struct rbd_obj_request
*obj_request
)
1062 dout("%s: obj %p (was %d)\n", __func__
, obj_request
,
1063 atomic_read(&obj_request
->kref
.refcount
));
1064 kref_get(&obj_request
->kref
);
1067 static void rbd_obj_request_destroy(struct kref
*kref
);
1068 static void rbd_obj_request_put(struct rbd_obj_request
*obj_request
)
1070 rbd_assert(obj_request
!= NULL
);
1071 dout("%s: obj %p (was %d)\n", __func__
, obj_request
,
1072 atomic_read(&obj_request
->kref
.refcount
));
1073 kref_put(&obj_request
->kref
, rbd_obj_request_destroy
);
1076 static void rbd_img_request_get(struct rbd_img_request
*img_request
)
1078 dout("%s: img %p (was %d)\n", __func__
, img_request
,
1079 atomic_read(&img_request
->kref
.refcount
));
1080 kref_get(&img_request
->kref
);
1083 static void rbd_img_request_destroy(struct kref
*kref
);
1084 static void rbd_img_request_put(struct rbd_img_request
*img_request
)
1086 rbd_assert(img_request
!= NULL
);
1087 dout("%s: img %p (was %d)\n", __func__
, img_request
,
1088 atomic_read(&img_request
->kref
.refcount
));
1089 kref_put(&img_request
->kref
, rbd_img_request_destroy
);
1092 static inline void rbd_img_obj_request_add(struct rbd_img_request
*img_request
,
1093 struct rbd_obj_request
*obj_request
)
1095 rbd_assert(obj_request
->img_request
== NULL
);
1097 rbd_obj_request_get(obj_request
);
1098 obj_request
->img_request
= img_request
;
1099 obj_request
->which
= img_request
->obj_request_count
;
1100 rbd_assert(obj_request
->which
!= BAD_WHICH
);
1101 img_request
->obj_request_count
++;
1102 list_add_tail(&obj_request
->links
, &img_request
->obj_requests
);
1103 dout("%s: img %p obj %p w=%u\n", __func__
, img_request
, obj_request
,
1104 obj_request
->which
);
1107 static inline void rbd_img_obj_request_del(struct rbd_img_request
*img_request
,
1108 struct rbd_obj_request
*obj_request
)
1110 rbd_assert(obj_request
->which
!= BAD_WHICH
);
1112 dout("%s: img %p obj %p w=%u\n", __func__
, img_request
, obj_request
,
1113 obj_request
->which
);
1114 list_del(&obj_request
->links
);
1115 rbd_assert(img_request
->obj_request_count
> 0);
1116 img_request
->obj_request_count
--;
1117 rbd_assert(obj_request
->which
== img_request
->obj_request_count
);
1118 obj_request
->which
= BAD_WHICH
;
1119 rbd_assert(obj_request
->img_request
== img_request
);
1120 obj_request
->img_request
= NULL
;
1121 obj_request
->callback
= NULL
;
1122 rbd_obj_request_put(obj_request
);
1125 static bool obj_request_type_valid(enum obj_request_type type
)
1128 case OBJ_REQUEST_NODATA
:
1129 case OBJ_REQUEST_BIO
:
1130 case OBJ_REQUEST_PAGES
:
1137 static int rbd_obj_request_submit(struct ceph_osd_client
*osdc
,
1138 struct rbd_obj_request
*obj_request
)
1140 dout("%s: osdc %p obj %p\n", __func__
, osdc
, obj_request
);
1142 return ceph_osdc_start_request(osdc
, obj_request
->osd_req
, false);
1145 static void rbd_img_request_complete(struct rbd_img_request
*img_request
)
1147 dout("%s: img %p\n", __func__
, img_request
);
1148 if (img_request
->callback
)
1149 img_request
->callback(img_request
);
1151 rbd_img_request_put(img_request
);
1154 /* Caller is responsible for rbd_obj_request_destroy(obj_request) */
1156 static int rbd_obj_request_wait(struct rbd_obj_request
*obj_request
)
1158 dout("%s: obj %p\n", __func__
, obj_request
);
1160 return wait_for_completion_interruptible(&obj_request
->completion
);
1163 static void obj_request_done_init(struct rbd_obj_request
*obj_request
)
1165 atomic_set(&obj_request
->done
, 0);
1169 static void obj_request_done_set(struct rbd_obj_request
*obj_request
)
1173 done
= atomic_inc_return(&obj_request
->done
);
1175 struct rbd_img_request
*img_request
= obj_request
->img_request
;
1176 struct rbd_device
*rbd_dev
;
1178 rbd_dev
= img_request
? img_request
->rbd_dev
: NULL
;
1179 rbd_warn(rbd_dev
, "obj_request %p was already done\n",
1184 static bool obj_request_done_test(struct rbd_obj_request
*obj_request
)
1187 return atomic_read(&obj_request
->done
) != 0;
1191 rbd_img_obj_request_read_callback(struct rbd_obj_request
*obj_request
)
1193 dout("%s: obj %p img %p result %d %llu/%llu\n", __func__
,
1194 obj_request
, obj_request
->img_request
, obj_request
->result
,
1195 obj_request
->xferred
, obj_request
->length
);
1197 * ENOENT means a hole in the image. We zero-fill the
1198 * entire length of the request. A short read also implies
1199 * zero-fill to the end of the request. Either way we
1200 * update the xferred count to indicate the whole request
1203 BUG_ON(obj_request
->type
!= OBJ_REQUEST_BIO
);
1204 if (obj_request
->result
== -ENOENT
) {
1205 zero_bio_chain(obj_request
->bio_list
, 0);
1206 obj_request
->result
= 0;
1207 obj_request
->xferred
= obj_request
->length
;
1208 } else if (obj_request
->xferred
< obj_request
->length
&&
1209 !obj_request
->result
) {
1210 zero_bio_chain(obj_request
->bio_list
, obj_request
->xferred
);
1211 obj_request
->xferred
= obj_request
->length
;
1213 obj_request_done_set(obj_request
);
1216 static void rbd_obj_request_complete(struct rbd_obj_request
*obj_request
)
1218 dout("%s: obj %p cb %p\n", __func__
, obj_request
,
1219 obj_request
->callback
);
1220 if (obj_request
->callback
)
1221 obj_request
->callback(obj_request
);
1223 complete_all(&obj_request
->completion
);
1226 static void rbd_osd_trivial_callback(struct rbd_obj_request
*obj_request
)
1228 dout("%s: obj %p\n", __func__
, obj_request
);
1229 obj_request_done_set(obj_request
);
1232 static void rbd_osd_read_callback(struct rbd_obj_request
*obj_request
)
1234 dout("%s: obj %p result %d %llu/%llu\n", __func__
, obj_request
,
1235 obj_request
->result
, obj_request
->xferred
, obj_request
->length
);
1236 if (obj_request
->img_request
)
1237 rbd_img_obj_request_read_callback(obj_request
);
1239 obj_request_done_set(obj_request
);
1242 static void rbd_osd_write_callback(struct rbd_obj_request
*obj_request
)
1244 dout("%s: obj %p result %d %llu\n", __func__
, obj_request
,
1245 obj_request
->result
, obj_request
->length
);
1247 * There is no such thing as a successful short write.
1248 * Our xferred value is the number of bytes transferred
1249 * back. Set it to our originally-requested length.
1251 obj_request
->xferred
= obj_request
->length
;
1252 obj_request_done_set(obj_request
);
1256 * For a simple stat call there's nothing to do. We'll do more if
1257 * this is part of a write sequence for a layered image.
1259 static void rbd_osd_stat_callback(struct rbd_obj_request
*obj_request
)
1261 dout("%s: obj %p\n", __func__
, obj_request
);
1262 obj_request_done_set(obj_request
);
1265 static void rbd_osd_req_callback(struct ceph_osd_request
*osd_req
,
1266 struct ceph_msg
*msg
)
1268 struct rbd_obj_request
*obj_request
= osd_req
->r_priv
;
1271 dout("%s: osd_req %p msg %p\n", __func__
, osd_req
, msg
);
1272 rbd_assert(osd_req
== obj_request
->osd_req
);
1273 rbd_assert(!!obj_request
->img_request
^
1274 (obj_request
->which
== BAD_WHICH
));
1276 if (osd_req
->r_result
< 0)
1277 obj_request
->result
= osd_req
->r_result
;
1278 obj_request
->version
= le64_to_cpu(osd_req
->r_reassert_version
.version
);
1280 WARN_ON(osd_req
->r_num_ops
!= 1); /* For now */
1283 * We support a 64-bit length, but ultimately it has to be
1284 * passed to blk_end_request(), which takes an unsigned int.
1286 obj_request
->xferred
= osd_req
->r_reply_op_len
[0];
1287 rbd_assert(obj_request
->xferred
< (u64
) UINT_MAX
);
1288 opcode
= osd_req
->r_ops
[0].op
;
1290 case CEPH_OSD_OP_READ
:
1291 rbd_osd_read_callback(obj_request
);
1293 case CEPH_OSD_OP_WRITE
:
1294 rbd_osd_write_callback(obj_request
);
1296 case CEPH_OSD_OP_STAT
:
1297 rbd_osd_stat_callback(obj_request
);
1299 case CEPH_OSD_OP_CALL
:
1300 case CEPH_OSD_OP_NOTIFY_ACK
:
1301 case CEPH_OSD_OP_WATCH
:
1302 rbd_osd_trivial_callback(obj_request
);
1305 rbd_warn(NULL
, "%s: unsupported op %hu\n",
1306 obj_request
->object_name
, (unsigned short) opcode
);
1310 if (obj_request_done_test(obj_request
))
1311 rbd_obj_request_complete(obj_request
);
1314 static void rbd_osd_req_format_op(struct rbd_obj_request
*obj_request
,
1317 struct rbd_img_request
*img_request
= obj_request
->img_request
;
1318 struct ceph_snap_context
*snapc
= NULL
;
1319 u64 snap_id
= CEPH_NOSNAP
;
1320 struct timespec
*mtime
= NULL
;
1321 struct timespec now
;
1323 rbd_assert(obj_request
->osd_req
!= NULL
);
1325 if (write_request
) {
1329 snapc
= img_request
->snapc
;
1330 } else if (img_request
) {
1331 snap_id
= img_request
->snap_id
;
1334 ceph_osdc_build_request(obj_request
->osd_req
, obj_request
->offset
,
1335 snapc
, snap_id
, mtime
);
1338 static struct ceph_osd_request
*rbd_osd_req_create(
1339 struct rbd_device
*rbd_dev
,
1341 struct rbd_obj_request
*obj_request
)
1343 struct rbd_img_request
*img_request
= obj_request
->img_request
;
1344 struct ceph_snap_context
*snapc
= NULL
;
1345 struct ceph_osd_client
*osdc
;
1346 struct ceph_osd_request
*osd_req
;
1347 struct ceph_osd_data
*osd_data
;
1348 u64 offset
= obj_request
->offset
;
1351 rbd_assert(img_request
->write_request
== write_request
);
1352 if (img_request
->write_request
)
1353 snapc
= img_request
->snapc
;
1356 /* Allocate and initialize the request, for the single op */
1358 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1359 osd_req
= ceph_osdc_alloc_request(osdc
, snapc
, 1, false, GFP_ATOMIC
);
1361 return NULL
; /* ENOMEM */
1362 osd_data
= write_request
? &osd_req
->r_data_out
: &osd_req
->r_data_in
;
1364 rbd_assert(obj_request_type_valid(obj_request
->type
));
1365 switch (obj_request
->type
) {
1366 case OBJ_REQUEST_NODATA
:
1367 break; /* Nothing to do */
1368 case OBJ_REQUEST_BIO
:
1369 rbd_assert(obj_request
->bio_list
!= NULL
);
1370 ceph_osd_data_bio_init(osd_data
, obj_request
->bio_list
,
1371 obj_request
->length
);
1373 case OBJ_REQUEST_PAGES
:
1374 ceph_osd_data_pages_init(osd_data
, obj_request
->pages
,
1375 obj_request
->length
, offset
& ~PAGE_MASK
,
1381 osd_req
->r_flags
= CEPH_OSD_FLAG_WRITE
| CEPH_OSD_FLAG_ONDISK
;
1383 osd_req
->r_flags
= CEPH_OSD_FLAG_READ
;
1385 osd_req
->r_callback
= rbd_osd_req_callback
;
1386 osd_req
->r_priv
= obj_request
;
1388 osd_req
->r_oid_len
= strlen(obj_request
->object_name
);
1389 rbd_assert(osd_req
->r_oid_len
< sizeof (osd_req
->r_oid
));
1390 memcpy(osd_req
->r_oid
, obj_request
->object_name
, osd_req
->r_oid_len
);
1392 osd_req
->r_file_layout
= rbd_dev
->layout
; /* struct */
1397 static void rbd_osd_req_destroy(struct ceph_osd_request
*osd_req
)
1399 ceph_osdc_put_request(osd_req
);
1402 /* object_name is assumed to be a non-null pointer and NUL-terminated */
1404 static struct rbd_obj_request
*rbd_obj_request_create(const char *object_name
,
1405 u64 offset
, u64 length
,
1406 enum obj_request_type type
)
1408 struct rbd_obj_request
*obj_request
;
1412 rbd_assert(obj_request_type_valid(type
));
1414 size
= strlen(object_name
) + 1;
1415 obj_request
= kzalloc(sizeof (*obj_request
) + size
, GFP_KERNEL
);
1419 name
= (char *)(obj_request
+ 1);
1420 obj_request
->object_name
= memcpy(name
, object_name
, size
);
1421 obj_request
->offset
= offset
;
1422 obj_request
->length
= length
;
1423 obj_request
->which
= BAD_WHICH
;
1424 obj_request
->type
= type
;
1425 INIT_LIST_HEAD(&obj_request
->links
);
1426 obj_request_done_init(obj_request
);
1427 init_completion(&obj_request
->completion
);
1428 kref_init(&obj_request
->kref
);
1430 dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__
, object_name
,
1431 offset
, length
, (int)type
, obj_request
);
1436 static void rbd_obj_request_destroy(struct kref
*kref
)
1438 struct rbd_obj_request
*obj_request
;
1440 obj_request
= container_of(kref
, struct rbd_obj_request
, kref
);
1442 dout("%s: obj %p\n", __func__
, obj_request
);
1444 rbd_assert(obj_request
->img_request
== NULL
);
1445 rbd_assert(obj_request
->which
== BAD_WHICH
);
1447 if (obj_request
->osd_req
)
1448 rbd_osd_req_destroy(obj_request
->osd_req
);
1450 rbd_assert(obj_request_type_valid(obj_request
->type
));
1451 switch (obj_request
->type
) {
1452 case OBJ_REQUEST_NODATA
:
1453 break; /* Nothing to do */
1454 case OBJ_REQUEST_BIO
:
1455 if (obj_request
->bio_list
)
1456 bio_chain_put(obj_request
->bio_list
);
1458 case OBJ_REQUEST_PAGES
:
1459 if (obj_request
->pages
)
1460 ceph_release_page_vector(obj_request
->pages
,
1461 obj_request
->page_count
);
1469 * Caller is responsible for filling in the list of object requests
1470 * that comprises the image request, and the Linux request pointer
1471 * (if there is one).
1473 static struct rbd_img_request
*rbd_img_request_create(
1474 struct rbd_device
*rbd_dev
,
1475 u64 offset
, u64 length
,
1478 struct rbd_img_request
*img_request
;
1479 struct ceph_snap_context
*snapc
= NULL
;
1481 img_request
= kmalloc(sizeof (*img_request
), GFP_ATOMIC
);
1485 if (write_request
) {
1486 down_read(&rbd_dev
->header_rwsem
);
1487 snapc
= ceph_get_snap_context(rbd_dev
->header
.snapc
);
1488 up_read(&rbd_dev
->header_rwsem
);
1489 if (WARN_ON(!snapc
)) {
1491 return NULL
; /* Shouldn't happen */
1495 img_request
->rq
= NULL
;
1496 img_request
->rbd_dev
= rbd_dev
;
1497 img_request
->offset
= offset
;
1498 img_request
->length
= length
;
1499 img_request
->write_request
= write_request
;
1501 img_request
->snapc
= snapc
;
1503 img_request
->snap_id
= rbd_dev
->spec
->snap_id
;
1504 spin_lock_init(&img_request
->completion_lock
);
1505 img_request
->next_completion
= 0;
1506 img_request
->callback
= NULL
;
1507 img_request
->obj_request_count
= 0;
1508 INIT_LIST_HEAD(&img_request
->obj_requests
);
1509 kref_init(&img_request
->kref
);
1511 rbd_img_request_get(img_request
); /* Avoid a warning */
1512 rbd_img_request_put(img_request
); /* TEMPORARY */
1514 dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__
, rbd_dev
,
1515 write_request
? "write" : "read", offset
, length
,
1521 static void rbd_img_request_destroy(struct kref
*kref
)
1523 struct rbd_img_request
*img_request
;
1524 struct rbd_obj_request
*obj_request
;
1525 struct rbd_obj_request
*next_obj_request
;
1527 img_request
= container_of(kref
, struct rbd_img_request
, kref
);
1529 dout("%s: img %p\n", __func__
, img_request
);
1531 for_each_obj_request_safe(img_request
, obj_request
, next_obj_request
)
1532 rbd_img_obj_request_del(img_request
, obj_request
);
1533 rbd_assert(img_request
->obj_request_count
== 0);
1535 if (img_request
->write_request
)
1536 ceph_put_snap_context(img_request
->snapc
);
1541 static int rbd_img_request_fill_bio(struct rbd_img_request
*img_request
,
1542 struct bio
*bio_list
)
1544 struct rbd_device
*rbd_dev
= img_request
->rbd_dev
;
1545 struct rbd_obj_request
*obj_request
= NULL
;
1546 struct rbd_obj_request
*next_obj_request
;
1547 bool write_request
= img_request
->write_request
;
1548 unsigned int bio_offset
;
1553 dout("%s: img %p bio %p\n", __func__
, img_request
, bio_list
);
1555 opcode
= write_request
? CEPH_OSD_OP_WRITE
: CEPH_OSD_OP_READ
;
1557 image_offset
= img_request
->offset
;
1558 rbd_assert(image_offset
== bio_list
->bi_sector
<< SECTOR_SHIFT
);
1559 resid
= img_request
->length
;
1560 rbd_assert(resid
> 0);
1562 const char *object_name
;
1563 unsigned int clone_size
;
1564 struct ceph_osd_req_op
*op
;
1568 object_name
= rbd_segment_name(rbd_dev
, image_offset
);
1571 offset
= rbd_segment_offset(rbd_dev
, image_offset
);
1572 length
= rbd_segment_length(rbd_dev
, image_offset
, resid
);
1573 obj_request
= rbd_obj_request_create(object_name
,
1576 kfree(object_name
); /* object request has its own copy */
1580 rbd_assert(length
<= (u64
) UINT_MAX
);
1581 clone_size
= (unsigned int) length
;
1582 obj_request
->bio_list
= bio_chain_clone_range(&bio_list
,
1583 &bio_offset
, clone_size
,
1585 if (!obj_request
->bio_list
)
1588 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
,
1589 write_request
, obj_request
);
1590 if (!obj_request
->osd_req
)
1593 op
= &obj_request
->osd_req
->r_ops
[0];
1594 osd_req_op_extent_init(op
, opcode
, offset
, length
, 0, 0);
1595 rbd_osd_req_format_op(obj_request
, write_request
);
1597 /* status and version are initially zero-filled */
1599 rbd_img_obj_request_add(img_request
, obj_request
);
1601 image_offset
+= length
;
1608 rbd_obj_request_put(obj_request
);
1610 for_each_obj_request_safe(img_request
, obj_request
, next_obj_request
)
1611 rbd_obj_request_put(obj_request
);
1616 static void rbd_img_obj_callback(struct rbd_obj_request
*obj_request
)
1618 struct rbd_img_request
*img_request
;
1619 u32 which
= obj_request
->which
;
1622 img_request
= obj_request
->img_request
;
1624 dout("%s: img %p obj %p\n", __func__
, img_request
, obj_request
);
1625 rbd_assert(img_request
!= NULL
);
1626 rbd_assert(img_request
->rq
!= NULL
);
1627 rbd_assert(img_request
->obj_request_count
> 0);
1628 rbd_assert(which
!= BAD_WHICH
);
1629 rbd_assert(which
< img_request
->obj_request_count
);
1630 rbd_assert(which
>= img_request
->next_completion
);
1632 spin_lock_irq(&img_request
->completion_lock
);
1633 if (which
!= img_request
->next_completion
)
1636 for_each_obj_request_from(img_request
, obj_request
) {
1637 unsigned int xferred
;
1641 rbd_assert(which
< img_request
->obj_request_count
);
1643 if (!obj_request_done_test(obj_request
))
1646 rbd_assert(obj_request
->xferred
<= (u64
) UINT_MAX
);
1647 xferred
= (unsigned int) obj_request
->xferred
;
1648 result
= (int) obj_request
->result
;
1650 rbd_warn(NULL
, "obj_request %s result %d xferred %u\n",
1651 img_request
->write_request
? "write" : "read",
1654 more
= blk_end_request(img_request
->rq
, result
, xferred
);
1658 rbd_assert(more
^ (which
== img_request
->obj_request_count
));
1659 img_request
->next_completion
= which
;
1661 spin_unlock_irq(&img_request
->completion_lock
);
1664 rbd_img_request_complete(img_request
);
1667 static int rbd_img_request_submit(struct rbd_img_request
*img_request
)
1669 struct rbd_device
*rbd_dev
= img_request
->rbd_dev
;
1670 struct ceph_osd_client
*osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1671 struct rbd_obj_request
*obj_request
;
1672 struct rbd_obj_request
*next_obj_request
;
1674 dout("%s: img %p\n", __func__
, img_request
);
1675 for_each_obj_request_safe(img_request
, obj_request
, next_obj_request
) {
1678 obj_request
->callback
= rbd_img_obj_callback
;
1679 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1683 * The image request has its own reference to each
1684 * of its object requests, so we can safely drop the
1687 rbd_obj_request_put(obj_request
);
1693 static int rbd_obj_notify_ack(struct rbd_device
*rbd_dev
,
1694 u64 ver
, u64 notify_id
)
1696 struct rbd_obj_request
*obj_request
;
1697 struct ceph_osd_req_op
*op
;
1698 struct ceph_osd_client
*osdc
;
1701 obj_request
= rbd_obj_request_create(rbd_dev
->header_name
, 0, 0,
1702 OBJ_REQUEST_NODATA
);
1707 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false, obj_request
);
1708 if (!obj_request
->osd_req
)
1711 op
= &obj_request
->osd_req
->r_ops
[0];
1712 osd_req_op_watch_init(op
, CEPH_OSD_OP_NOTIFY_ACK
, notify_id
, ver
, 0);
1713 rbd_osd_req_format_op(obj_request
, false);
1715 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1716 obj_request
->callback
= rbd_obj_request_put
;
1717 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1720 rbd_obj_request_put(obj_request
);
1725 static void rbd_watch_cb(u64 ver
, u64 notify_id
, u8 opcode
, void *data
)
1727 struct rbd_device
*rbd_dev
= (struct rbd_device
*)data
;
1734 dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__
,
1735 rbd_dev
->header_name
, (unsigned long long) notify_id
,
1736 (unsigned int) opcode
);
1737 rc
= rbd_dev_refresh(rbd_dev
, &hver
);
1739 rbd_warn(rbd_dev
, "got notification but failed to "
1740 " update snaps: %d\n", rc
);
1742 rbd_obj_notify_ack(rbd_dev
, hver
, notify_id
);
1746 * Request sync osd watch/unwatch. The value of "start" determines
1747 * whether a watch request is being initiated or torn down.
1749 static int rbd_dev_header_watch_sync(struct rbd_device
*rbd_dev
, int start
)
1751 struct ceph_osd_client
*osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1752 struct rbd_obj_request
*obj_request
;
1753 struct ceph_osd_req_op
*op
;
1756 rbd_assert(start
^ !!rbd_dev
->watch_event
);
1757 rbd_assert(start
^ !!rbd_dev
->watch_request
);
1760 ret
= ceph_osdc_create_event(osdc
, rbd_watch_cb
, rbd_dev
,
1761 &rbd_dev
->watch_event
);
1764 rbd_assert(rbd_dev
->watch_event
!= NULL
);
1768 obj_request
= rbd_obj_request_create(rbd_dev
->header_name
, 0, 0,
1769 OBJ_REQUEST_NODATA
);
1773 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, true, obj_request
);
1774 if (!obj_request
->osd_req
)
1777 op
= &obj_request
->osd_req
->r_ops
[0];
1778 osd_req_op_watch_init(op
, CEPH_OSD_OP_WATCH
,
1779 rbd_dev
->watch_event
->cookie
,
1780 rbd_dev
->header
.obj_version
, start
);
1781 rbd_osd_req_format_op(obj_request
, true);
1784 ceph_osdc_set_request_linger(osdc
, obj_request
->osd_req
);
1786 ceph_osdc_unregister_linger_request(osdc
,
1787 rbd_dev
->watch_request
->osd_req
);
1788 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1791 ret
= rbd_obj_request_wait(obj_request
);
1794 ret
= obj_request
->result
;
1799 * A watch request is set to linger, so the underlying osd
1800 * request won't go away until we unregister it. We retain
1801 * a pointer to the object request during that time (in
1802 * rbd_dev->watch_request), so we'll keep a reference to
1803 * it. We'll drop that reference (below) after we've
1807 rbd_dev
->watch_request
= obj_request
;
1812 /* We have successfully torn down the watch request */
1814 rbd_obj_request_put(rbd_dev
->watch_request
);
1815 rbd_dev
->watch_request
= NULL
;
1817 /* Cancel the event if we're tearing down, or on error */
1818 ceph_osdc_cancel_event(rbd_dev
->watch_event
);
1819 rbd_dev
->watch_event
= NULL
;
1821 rbd_obj_request_put(obj_request
);
1827 * Synchronous osd object method call
1829 static int rbd_obj_method_sync(struct rbd_device
*rbd_dev
,
1830 const char *object_name
,
1831 const char *class_name
,
1832 const char *method_name
,
1833 const char *outbound
,
1834 size_t outbound_size
,
1836 size_t inbound_size
,
1839 struct rbd_obj_request
*obj_request
;
1840 struct ceph_osd_client
*osdc
;
1841 struct ceph_osd_req_op
*op
;
1842 struct page
**pages
;
1847 * Method calls are ultimately read operations. The result
1848 * should placed into the inbound buffer provided. They
1849 * also supply outbound data--parameters for the object
1850 * method. Currently if this is present it will be a
1853 page_count
= (u32
) calc_pages_for(0, inbound_size
);
1854 pages
= ceph_alloc_page_vector(page_count
, GFP_KERNEL
);
1856 return PTR_ERR(pages
);
1859 obj_request
= rbd_obj_request_create(object_name
, 0, inbound_size
,
1864 obj_request
->pages
= pages
;
1865 obj_request
->page_count
= page_count
;
1867 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false, obj_request
);
1868 if (!obj_request
->osd_req
)
1871 op
= &obj_request
->osd_req
->r_ops
[0];
1872 osd_req_op_cls_init(op
, CEPH_OSD_OP_CALL
, class_name
, method_name
,
1873 outbound
, outbound_size
);
1874 rbd_osd_req_format_op(obj_request
, false);
1876 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
1877 ret
= rbd_obj_request_submit(osdc
, obj_request
);
1880 ret
= rbd_obj_request_wait(obj_request
);
1884 ret
= obj_request
->result
;
1888 ceph_copy_from_page_vector(pages
, inbound
, 0, obj_request
->xferred
);
1890 *version
= obj_request
->version
;
1893 rbd_obj_request_put(obj_request
);
1895 ceph_release_page_vector(pages
, page_count
);
1900 static void rbd_request_fn(struct request_queue
*q
)
1901 __releases(q
->queue_lock
) __acquires(q
->queue_lock
)
1903 struct rbd_device
*rbd_dev
= q
->queuedata
;
1904 bool read_only
= rbd_dev
->mapping
.read_only
;
1908 while ((rq
= blk_fetch_request(q
))) {
1909 bool write_request
= rq_data_dir(rq
) == WRITE
;
1910 struct rbd_img_request
*img_request
;
1914 /* Ignore any non-FS requests that filter through. */
1916 if (rq
->cmd_type
!= REQ_TYPE_FS
) {
1917 dout("%s: non-fs request type %d\n", __func__
,
1918 (int) rq
->cmd_type
);
1919 __blk_end_request_all(rq
, 0);
1923 /* Ignore/skip any zero-length requests */
1925 offset
= (u64
) blk_rq_pos(rq
) << SECTOR_SHIFT
;
1926 length
= (u64
) blk_rq_bytes(rq
);
1929 dout("%s: zero-length request\n", __func__
);
1930 __blk_end_request_all(rq
, 0);
1934 spin_unlock_irq(q
->queue_lock
);
1936 /* Disallow writes to a read-only device */
1938 if (write_request
) {
1942 rbd_assert(rbd_dev
->spec
->snap_id
== CEPH_NOSNAP
);
1946 * Quit early if the mapped snapshot no longer
1947 * exists. It's still possible the snapshot will
1948 * have disappeared by the time our request arrives
1949 * at the osd, but there's no sense in sending it if
1952 if (!test_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
)) {
1953 dout("request for non-existent snapshot");
1954 rbd_assert(rbd_dev
->spec
->snap_id
!= CEPH_NOSNAP
);
1960 if (WARN_ON(offset
&& length
> U64_MAX
- offset
+ 1))
1961 goto end_request
; /* Shouldn't happen */
1964 img_request
= rbd_img_request_create(rbd_dev
, offset
, length
,
1969 img_request
->rq
= rq
;
1971 result
= rbd_img_request_fill_bio(img_request
, rq
->bio
);
1973 result
= rbd_img_request_submit(img_request
);
1975 rbd_img_request_put(img_request
);
1977 spin_lock_irq(q
->queue_lock
);
1979 rbd_warn(rbd_dev
, "obj_request %s result %d\n",
1980 write_request
? "write" : "read", result
);
1981 __blk_end_request_all(rq
, result
);
1987 * a queue callback. Makes sure that we don't create a bio that spans across
1988 * multiple osd objects. One exception would be with a single page bios,
1989 * which we handle later at bio_chain_clone_range()
1991 static int rbd_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bmd
,
1992 struct bio_vec
*bvec
)
1994 struct rbd_device
*rbd_dev
= q
->queuedata
;
1995 sector_t sector_offset
;
1996 sector_t sectors_per_obj
;
1997 sector_t obj_sector_offset
;
2001 * Find how far into its rbd object the partition-relative
2002 * bio start sector is to offset relative to the enclosing
2005 sector_offset
= get_start_sect(bmd
->bi_bdev
) + bmd
->bi_sector
;
2006 sectors_per_obj
= 1 << (rbd_dev
->header
.obj_order
- SECTOR_SHIFT
);
2007 obj_sector_offset
= sector_offset
& (sectors_per_obj
- 1);
2010 * Compute the number of bytes from that offset to the end
2011 * of the object. Account for what's already used by the bio.
2013 ret
= (int) (sectors_per_obj
- obj_sector_offset
) << SECTOR_SHIFT
;
2014 if (ret
> bmd
->bi_size
)
2015 ret
-= bmd
->bi_size
;
2020 * Don't send back more than was asked for. And if the bio
2021 * was empty, let the whole thing through because: "Note
2022 * that a block device *must* allow a single page to be
2023 * added to an empty bio."
2025 rbd_assert(bvec
->bv_len
<= PAGE_SIZE
);
2026 if (ret
> (int) bvec
->bv_len
|| !bmd
->bi_size
)
2027 ret
= (int) bvec
->bv_len
;
2032 static void rbd_free_disk(struct rbd_device
*rbd_dev
)
2034 struct gendisk
*disk
= rbd_dev
->disk
;
2039 if (disk
->flags
& GENHD_FL_UP
)
2042 blk_cleanup_queue(disk
->queue
);
2046 static int rbd_obj_read_sync(struct rbd_device
*rbd_dev
,
2047 const char *object_name
,
2048 u64 offset
, u64 length
,
2049 char *buf
, u64
*version
)
2052 struct rbd_obj_request
*obj_request
;
2053 struct ceph_osd_req_op
*op
;
2054 struct ceph_osd_client
*osdc
;
2055 struct page
**pages
= NULL
;
2060 page_count
= (u32
) calc_pages_for(offset
, length
);
2061 pages
= ceph_alloc_page_vector(page_count
, GFP_KERNEL
);
2063 ret
= PTR_ERR(pages
);
2066 obj_request
= rbd_obj_request_create(object_name
, offset
, length
,
2071 obj_request
->pages
= pages
;
2072 obj_request
->page_count
= page_count
;
2074 obj_request
->osd_req
= rbd_osd_req_create(rbd_dev
, false, obj_request
);
2075 if (!obj_request
->osd_req
)
2078 op
= &obj_request
->osd_req
->r_ops
[0];
2079 osd_req_op_extent_init(op
, CEPH_OSD_OP_READ
, offset
, length
, 0, 0);
2080 rbd_osd_req_format_op(obj_request
, false);
2082 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
2083 ret
= rbd_obj_request_submit(osdc
, obj_request
);
2086 ret
= rbd_obj_request_wait(obj_request
);
2090 ret
= obj_request
->result
;
2094 rbd_assert(obj_request
->xferred
<= (u64
) SIZE_MAX
);
2095 size
= (size_t) obj_request
->xferred
;
2096 ceph_copy_from_page_vector(pages
, buf
, 0, size
);
2097 rbd_assert(size
<= (size_t) INT_MAX
);
2100 *version
= obj_request
->version
;
2103 rbd_obj_request_put(obj_request
);
2105 ceph_release_page_vector(pages
, page_count
);
2111 * Read the complete header for the given rbd device.
2113 * Returns a pointer to a dynamically-allocated buffer containing
2114 * the complete and validated header. Caller can pass the address
2115 * of a variable that will be filled in with the version of the
2116 * header object at the time it was read.
2118 * Returns a pointer-coded errno if a failure occurs.
2120 static struct rbd_image_header_ondisk
*
2121 rbd_dev_v1_header_read(struct rbd_device
*rbd_dev
, u64
*version
)
2123 struct rbd_image_header_ondisk
*ondisk
= NULL
;
2130 * The complete header will include an array of its 64-bit
2131 * snapshot ids, followed by the names of those snapshots as
2132 * a contiguous block of NUL-terminated strings. Note that
2133 * the number of snapshots could change by the time we read
2134 * it in, in which case we re-read it.
2141 size
= sizeof (*ondisk
);
2142 size
+= snap_count
* sizeof (struct rbd_image_snap_ondisk
);
2144 ondisk
= kmalloc(size
, GFP_KERNEL
);
2146 return ERR_PTR(-ENOMEM
);
2148 ret
= rbd_obj_read_sync(rbd_dev
, rbd_dev
->header_name
,
2150 (char *) ondisk
, version
);
2153 if (WARN_ON((size_t) ret
< size
)) {
2155 rbd_warn(rbd_dev
, "short header read (want %zd got %d)",
2159 if (!rbd_dev_ondisk_valid(ondisk
)) {
2161 rbd_warn(rbd_dev
, "invalid header");
2165 names_size
= le64_to_cpu(ondisk
->snap_names_len
);
2166 want_count
= snap_count
;
2167 snap_count
= le32_to_cpu(ondisk
->snap_count
);
2168 } while (snap_count
!= want_count
);
2175 return ERR_PTR(ret
);
2179 * reload the ondisk the header
2181 static int rbd_read_header(struct rbd_device
*rbd_dev
,
2182 struct rbd_image_header
*header
)
2184 struct rbd_image_header_ondisk
*ondisk
;
2188 ondisk
= rbd_dev_v1_header_read(rbd_dev
, &ver
);
2190 return PTR_ERR(ondisk
);
2191 ret
= rbd_header_from_disk(header
, ondisk
);
2193 header
->obj_version
= ver
;
2199 static void rbd_remove_all_snaps(struct rbd_device
*rbd_dev
)
2201 struct rbd_snap
*snap
;
2202 struct rbd_snap
*next
;
2204 list_for_each_entry_safe(snap
, next
, &rbd_dev
->snaps
, node
)
2205 rbd_remove_snap_dev(snap
);
2208 static void rbd_update_mapping_size(struct rbd_device
*rbd_dev
)
2212 if (rbd_dev
->spec
->snap_id
!= CEPH_NOSNAP
)
2215 size
= (sector_t
) rbd_dev
->header
.image_size
/ SECTOR_SIZE
;
2216 dout("setting size to %llu sectors", (unsigned long long) size
);
2217 rbd_dev
->mapping
.size
= (u64
) size
;
2218 set_capacity(rbd_dev
->disk
, size
);
2222 * only read the first part of the ondisk header, without the snaps info
2224 static int rbd_dev_v1_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
2227 struct rbd_image_header h
;
2229 ret
= rbd_read_header(rbd_dev
, &h
);
2233 down_write(&rbd_dev
->header_rwsem
);
2235 /* Update image size, and check for resize of mapped image */
2236 rbd_dev
->header
.image_size
= h
.image_size
;
2237 rbd_update_mapping_size(rbd_dev
);
2239 /* rbd_dev->header.object_prefix shouldn't change */
2240 kfree(rbd_dev
->header
.snap_sizes
);
2241 kfree(rbd_dev
->header
.snap_names
);
2242 /* osd requests may still refer to snapc */
2243 ceph_put_snap_context(rbd_dev
->header
.snapc
);
2246 *hver
= h
.obj_version
;
2247 rbd_dev
->header
.obj_version
= h
.obj_version
;
2248 rbd_dev
->header
.image_size
= h
.image_size
;
2249 rbd_dev
->header
.snapc
= h
.snapc
;
2250 rbd_dev
->header
.snap_names
= h
.snap_names
;
2251 rbd_dev
->header
.snap_sizes
= h
.snap_sizes
;
2252 /* Free the extra copy of the object prefix */
2253 WARN_ON(strcmp(rbd_dev
->header
.object_prefix
, h
.object_prefix
));
2254 kfree(h
.object_prefix
);
2256 ret
= rbd_dev_snaps_update(rbd_dev
);
2258 ret
= rbd_dev_snaps_register(rbd_dev
);
2260 up_write(&rbd_dev
->header_rwsem
);
2265 static int rbd_dev_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
2269 rbd_assert(rbd_image_format_valid(rbd_dev
->image_format
));
2270 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
2271 if (rbd_dev
->image_format
== 1)
2272 ret
= rbd_dev_v1_refresh(rbd_dev
, hver
);
2274 ret
= rbd_dev_v2_refresh(rbd_dev
, hver
);
2275 mutex_unlock(&ctl_mutex
);
2280 static int rbd_init_disk(struct rbd_device
*rbd_dev
)
2282 struct gendisk
*disk
;
2283 struct request_queue
*q
;
2286 /* create gendisk info */
2287 disk
= alloc_disk(RBD_MINORS_PER_MAJOR
);
2291 snprintf(disk
->disk_name
, sizeof(disk
->disk_name
), RBD_DRV_NAME
"%d",
2293 disk
->major
= rbd_dev
->major
;
2294 disk
->first_minor
= 0;
2295 disk
->fops
= &rbd_bd_ops
;
2296 disk
->private_data
= rbd_dev
;
2298 q
= blk_init_queue(rbd_request_fn
, &rbd_dev
->lock
);
2302 /* We use the default size, but let's be explicit about it. */
2303 blk_queue_physical_block_size(q
, SECTOR_SIZE
);
2305 /* set io sizes to object size */
2306 segment_size
= rbd_obj_bytes(&rbd_dev
->header
);
2307 blk_queue_max_hw_sectors(q
, segment_size
/ SECTOR_SIZE
);
2308 blk_queue_max_segment_size(q
, segment_size
);
2309 blk_queue_io_min(q
, segment_size
);
2310 blk_queue_io_opt(q
, segment_size
);
2312 blk_queue_merge_bvec(q
, rbd_merge_bvec
);
2315 q
->queuedata
= rbd_dev
;
2317 rbd_dev
->disk
= disk
;
2319 set_capacity(rbd_dev
->disk
, rbd_dev
->mapping
.size
/ SECTOR_SIZE
);
2332 static struct rbd_device
*dev_to_rbd_dev(struct device
*dev
)
2334 return container_of(dev
, struct rbd_device
, dev
);
2337 static ssize_t
rbd_size_show(struct device
*dev
,
2338 struct device_attribute
*attr
, char *buf
)
2340 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2343 down_read(&rbd_dev
->header_rwsem
);
2344 size
= get_capacity(rbd_dev
->disk
);
2345 up_read(&rbd_dev
->header_rwsem
);
2347 return sprintf(buf
, "%llu\n", (unsigned long long) size
* SECTOR_SIZE
);
2351 * Note this shows the features for whatever's mapped, which is not
2352 * necessarily the base image.
2354 static ssize_t
rbd_features_show(struct device
*dev
,
2355 struct device_attribute
*attr
, char *buf
)
2357 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2359 return sprintf(buf
, "0x%016llx\n",
2360 (unsigned long long) rbd_dev
->mapping
.features
);
2363 static ssize_t
rbd_major_show(struct device
*dev
,
2364 struct device_attribute
*attr
, char *buf
)
2366 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2368 return sprintf(buf
, "%d\n", rbd_dev
->major
);
2371 static ssize_t
rbd_client_id_show(struct device
*dev
,
2372 struct device_attribute
*attr
, char *buf
)
2374 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2376 return sprintf(buf
, "client%lld\n",
2377 ceph_client_id(rbd_dev
->rbd_client
->client
));
2380 static ssize_t
rbd_pool_show(struct device
*dev
,
2381 struct device_attribute
*attr
, char *buf
)
2383 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2385 return sprintf(buf
, "%s\n", rbd_dev
->spec
->pool_name
);
2388 static ssize_t
rbd_pool_id_show(struct device
*dev
,
2389 struct device_attribute
*attr
, char *buf
)
2391 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2393 return sprintf(buf
, "%llu\n",
2394 (unsigned long long) rbd_dev
->spec
->pool_id
);
2397 static ssize_t
rbd_name_show(struct device
*dev
,
2398 struct device_attribute
*attr
, char *buf
)
2400 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2402 if (rbd_dev
->spec
->image_name
)
2403 return sprintf(buf
, "%s\n", rbd_dev
->spec
->image_name
);
2405 return sprintf(buf
, "(unknown)\n");
2408 static ssize_t
rbd_image_id_show(struct device
*dev
,
2409 struct device_attribute
*attr
, char *buf
)
2411 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2413 return sprintf(buf
, "%s\n", rbd_dev
->spec
->image_id
);
2417 * Shows the name of the currently-mapped snapshot (or
2418 * RBD_SNAP_HEAD_NAME for the base image).
2420 static ssize_t
rbd_snap_show(struct device
*dev
,
2421 struct device_attribute
*attr
,
2424 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2426 return sprintf(buf
, "%s\n", rbd_dev
->spec
->snap_name
);
2430 * For an rbd v2 image, shows the pool id, image id, and snapshot id
2431 * for the parent image. If there is no parent, simply shows
2432 * "(no parent image)".
2434 static ssize_t
rbd_parent_show(struct device
*dev
,
2435 struct device_attribute
*attr
,
2438 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2439 struct rbd_spec
*spec
= rbd_dev
->parent_spec
;
2444 return sprintf(buf
, "(no parent image)\n");
2446 count
= sprintf(bufp
, "pool_id %llu\npool_name %s\n",
2447 (unsigned long long) spec
->pool_id
, spec
->pool_name
);
2452 count
= sprintf(bufp
, "image_id %s\nimage_name %s\n", spec
->image_id
,
2453 spec
->image_name
? spec
->image_name
: "(unknown)");
2458 count
= sprintf(bufp
, "snap_id %llu\nsnap_name %s\n",
2459 (unsigned long long) spec
->snap_id
, spec
->snap_name
);
2464 count
= sprintf(bufp
, "overlap %llu\n", rbd_dev
->parent_overlap
);
2469 return (ssize_t
) (bufp
- buf
);
2472 static ssize_t
rbd_image_refresh(struct device
*dev
,
2473 struct device_attribute
*attr
,
2477 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
2480 ret
= rbd_dev_refresh(rbd_dev
, NULL
);
2482 return ret
< 0 ? ret
: size
;
2485 static DEVICE_ATTR(size
, S_IRUGO
, rbd_size_show
, NULL
);
2486 static DEVICE_ATTR(features
, S_IRUGO
, rbd_features_show
, NULL
);
2487 static DEVICE_ATTR(major
, S_IRUGO
, rbd_major_show
, NULL
);
2488 static DEVICE_ATTR(client_id
, S_IRUGO
, rbd_client_id_show
, NULL
);
2489 static DEVICE_ATTR(pool
, S_IRUGO
, rbd_pool_show
, NULL
);
2490 static DEVICE_ATTR(pool_id
, S_IRUGO
, rbd_pool_id_show
, NULL
);
2491 static DEVICE_ATTR(name
, S_IRUGO
, rbd_name_show
, NULL
);
2492 static DEVICE_ATTR(image_id
, S_IRUGO
, rbd_image_id_show
, NULL
);
2493 static DEVICE_ATTR(refresh
, S_IWUSR
, NULL
, rbd_image_refresh
);
2494 static DEVICE_ATTR(current_snap
, S_IRUGO
, rbd_snap_show
, NULL
);
2495 static DEVICE_ATTR(parent
, S_IRUGO
, rbd_parent_show
, NULL
);
2497 static struct attribute
*rbd_attrs
[] = {
2498 &dev_attr_size
.attr
,
2499 &dev_attr_features
.attr
,
2500 &dev_attr_major
.attr
,
2501 &dev_attr_client_id
.attr
,
2502 &dev_attr_pool
.attr
,
2503 &dev_attr_pool_id
.attr
,
2504 &dev_attr_name
.attr
,
2505 &dev_attr_image_id
.attr
,
2506 &dev_attr_current_snap
.attr
,
2507 &dev_attr_parent
.attr
,
2508 &dev_attr_refresh
.attr
,
2512 static struct attribute_group rbd_attr_group
= {
2516 static const struct attribute_group
*rbd_attr_groups
[] = {
2521 static void rbd_sysfs_dev_release(struct device
*dev
)
2525 static struct device_type rbd_device_type
= {
2527 .groups
= rbd_attr_groups
,
2528 .release
= rbd_sysfs_dev_release
,
2536 static ssize_t
rbd_snap_size_show(struct device
*dev
,
2537 struct device_attribute
*attr
,
2540 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2542 return sprintf(buf
, "%llu\n", (unsigned long long)snap
->size
);
2545 static ssize_t
rbd_snap_id_show(struct device
*dev
,
2546 struct device_attribute
*attr
,
2549 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2551 return sprintf(buf
, "%llu\n", (unsigned long long)snap
->id
);
2554 static ssize_t
rbd_snap_features_show(struct device
*dev
,
2555 struct device_attribute
*attr
,
2558 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2560 return sprintf(buf
, "0x%016llx\n",
2561 (unsigned long long) snap
->features
);
2564 static DEVICE_ATTR(snap_size
, S_IRUGO
, rbd_snap_size_show
, NULL
);
2565 static DEVICE_ATTR(snap_id
, S_IRUGO
, rbd_snap_id_show
, NULL
);
2566 static DEVICE_ATTR(snap_features
, S_IRUGO
, rbd_snap_features_show
, NULL
);
2568 static struct attribute
*rbd_snap_attrs
[] = {
2569 &dev_attr_snap_size
.attr
,
2570 &dev_attr_snap_id
.attr
,
2571 &dev_attr_snap_features
.attr
,
2575 static struct attribute_group rbd_snap_attr_group
= {
2576 .attrs
= rbd_snap_attrs
,
2579 static void rbd_snap_dev_release(struct device
*dev
)
2581 struct rbd_snap
*snap
= container_of(dev
, struct rbd_snap
, dev
);
2586 static const struct attribute_group
*rbd_snap_attr_groups
[] = {
2587 &rbd_snap_attr_group
,
2591 static struct device_type rbd_snap_device_type
= {
2592 .groups
= rbd_snap_attr_groups
,
2593 .release
= rbd_snap_dev_release
,
2596 static struct rbd_spec
*rbd_spec_get(struct rbd_spec
*spec
)
2598 kref_get(&spec
->kref
);
2603 static void rbd_spec_free(struct kref
*kref
);
2604 static void rbd_spec_put(struct rbd_spec
*spec
)
2607 kref_put(&spec
->kref
, rbd_spec_free
);
2610 static struct rbd_spec
*rbd_spec_alloc(void)
2612 struct rbd_spec
*spec
;
2614 spec
= kzalloc(sizeof (*spec
), GFP_KERNEL
);
2617 kref_init(&spec
->kref
);
2619 rbd_spec_put(rbd_spec_get(spec
)); /* TEMPORARY */
2624 static void rbd_spec_free(struct kref
*kref
)
2626 struct rbd_spec
*spec
= container_of(kref
, struct rbd_spec
, kref
);
2628 kfree(spec
->pool_name
);
2629 kfree(spec
->image_id
);
2630 kfree(spec
->image_name
);
2631 kfree(spec
->snap_name
);
2635 static struct rbd_device
*rbd_dev_create(struct rbd_client
*rbdc
,
2636 struct rbd_spec
*spec
)
2638 struct rbd_device
*rbd_dev
;
2640 rbd_dev
= kzalloc(sizeof (*rbd_dev
), GFP_KERNEL
);
2644 spin_lock_init(&rbd_dev
->lock
);
2646 INIT_LIST_HEAD(&rbd_dev
->node
);
2647 INIT_LIST_HEAD(&rbd_dev
->snaps
);
2648 init_rwsem(&rbd_dev
->header_rwsem
);
2650 rbd_dev
->spec
= spec
;
2651 rbd_dev
->rbd_client
= rbdc
;
2653 /* Initialize the layout used for all rbd requests */
2655 rbd_dev
->layout
.fl_stripe_unit
= cpu_to_le32(1 << RBD_MAX_OBJ_ORDER
);
2656 rbd_dev
->layout
.fl_stripe_count
= cpu_to_le32(1);
2657 rbd_dev
->layout
.fl_object_size
= cpu_to_le32(1 << RBD_MAX_OBJ_ORDER
);
2658 rbd_dev
->layout
.fl_pg_pool
= cpu_to_le32((u32
) spec
->pool_id
);
2663 static void rbd_dev_destroy(struct rbd_device
*rbd_dev
)
2665 rbd_spec_put(rbd_dev
->parent_spec
);
2666 kfree(rbd_dev
->header_name
);
2667 rbd_put_client(rbd_dev
->rbd_client
);
2668 rbd_spec_put(rbd_dev
->spec
);
2672 static bool rbd_snap_registered(struct rbd_snap
*snap
)
2674 bool ret
= snap
->dev
.type
== &rbd_snap_device_type
;
2675 bool reg
= device_is_registered(&snap
->dev
);
2677 rbd_assert(!ret
^ reg
);
2682 static void rbd_remove_snap_dev(struct rbd_snap
*snap
)
2684 list_del(&snap
->node
);
2685 if (device_is_registered(&snap
->dev
))
2686 device_unregister(&snap
->dev
);
2689 static int rbd_register_snap_dev(struct rbd_snap
*snap
,
2690 struct device
*parent
)
2692 struct device
*dev
= &snap
->dev
;
2695 dev
->type
= &rbd_snap_device_type
;
2696 dev
->parent
= parent
;
2697 dev
->release
= rbd_snap_dev_release
;
2698 dev_set_name(dev
, "%s%s", RBD_SNAP_DEV_NAME_PREFIX
, snap
->name
);
2699 dout("%s: registering device for snapshot %s\n", __func__
, snap
->name
);
2701 ret
= device_register(dev
);
2706 static struct rbd_snap
*__rbd_add_snap_dev(struct rbd_device
*rbd_dev
,
2707 const char *snap_name
,
2708 u64 snap_id
, u64 snap_size
,
2711 struct rbd_snap
*snap
;
2714 snap
= kzalloc(sizeof (*snap
), GFP_KERNEL
);
2716 return ERR_PTR(-ENOMEM
);
2719 snap
->name
= kstrdup(snap_name
, GFP_KERNEL
);
2724 snap
->size
= snap_size
;
2725 snap
->features
= snap_features
;
2733 return ERR_PTR(ret
);
2736 static char *rbd_dev_v1_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
2737 u64
*snap_size
, u64
*snap_features
)
2741 rbd_assert(which
< rbd_dev
->header
.snapc
->num_snaps
);
2743 *snap_size
= rbd_dev
->header
.snap_sizes
[which
];
2744 *snap_features
= 0; /* No features for v1 */
2746 /* Skip over names until we find the one we are looking for */
2748 snap_name
= rbd_dev
->header
.snap_names
;
2750 snap_name
+= strlen(snap_name
) + 1;
2756 * Get the size and object order for an image snapshot, or if
2757 * snap_id is CEPH_NOSNAP, gets this information for the base
2760 static int _rbd_dev_v2_snap_size(struct rbd_device
*rbd_dev
, u64 snap_id
,
2761 u8
*order
, u64
*snap_size
)
2763 __le64 snapid
= cpu_to_le64(snap_id
);
2768 } __attribute__ ((packed
)) size_buf
= { 0 };
2770 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2772 (char *) &snapid
, sizeof (snapid
),
2773 (char *) &size_buf
, sizeof (size_buf
), NULL
);
2774 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2778 *order
= size_buf
.order
;
2779 *snap_size
= le64_to_cpu(size_buf
.size
);
2781 dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n",
2782 (unsigned long long) snap_id
, (unsigned int) *order
,
2783 (unsigned long long) *snap_size
);
2788 static int rbd_dev_v2_image_size(struct rbd_device
*rbd_dev
)
2790 return _rbd_dev_v2_snap_size(rbd_dev
, CEPH_NOSNAP
,
2791 &rbd_dev
->header
.obj_order
,
2792 &rbd_dev
->header
.image_size
);
2795 static int rbd_dev_v2_object_prefix(struct rbd_device
*rbd_dev
)
2801 reply_buf
= kzalloc(RBD_OBJ_PREFIX_LEN_MAX
, GFP_KERNEL
);
2805 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2806 "rbd", "get_object_prefix",
2808 reply_buf
, RBD_OBJ_PREFIX_LEN_MAX
, NULL
);
2809 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2814 rbd_dev
->header
.object_prefix
= ceph_extract_encoded_string(&p
,
2815 p
+ RBD_OBJ_PREFIX_LEN_MAX
,
2818 if (IS_ERR(rbd_dev
->header
.object_prefix
)) {
2819 ret
= PTR_ERR(rbd_dev
->header
.object_prefix
);
2820 rbd_dev
->header
.object_prefix
= NULL
;
2822 dout(" object_prefix = %s\n", rbd_dev
->header
.object_prefix
);
2831 static int _rbd_dev_v2_snap_features(struct rbd_device
*rbd_dev
, u64 snap_id
,
2834 __le64 snapid
= cpu_to_le64(snap_id
);
2838 } features_buf
= { 0 };
2842 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2843 "rbd", "get_features",
2844 (char *) &snapid
, sizeof (snapid
),
2845 (char *) &features_buf
, sizeof (features_buf
),
2847 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2851 incompat
= le64_to_cpu(features_buf
.incompat
);
2852 if (incompat
& ~RBD_FEATURES_ALL
)
2855 *snap_features
= le64_to_cpu(features_buf
.features
);
2857 dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
2858 (unsigned long long) snap_id
,
2859 (unsigned long long) *snap_features
,
2860 (unsigned long long) le64_to_cpu(features_buf
.incompat
));
2865 static int rbd_dev_v2_features(struct rbd_device
*rbd_dev
)
2867 return _rbd_dev_v2_snap_features(rbd_dev
, CEPH_NOSNAP
,
2868 &rbd_dev
->header
.features
);
2871 static int rbd_dev_v2_parent_info(struct rbd_device
*rbd_dev
)
2873 struct rbd_spec
*parent_spec
;
2875 void *reply_buf
= NULL
;
2883 parent_spec
= rbd_spec_alloc();
2887 size
= sizeof (__le64
) + /* pool_id */
2888 sizeof (__le32
) + RBD_IMAGE_ID_LEN_MAX
+ /* image_id */
2889 sizeof (__le64
) + /* snap_id */
2890 sizeof (__le64
); /* overlap */
2891 reply_buf
= kmalloc(size
, GFP_KERNEL
);
2897 snapid
= cpu_to_le64(CEPH_NOSNAP
);
2898 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
2899 "rbd", "get_parent",
2900 (char *) &snapid
, sizeof (snapid
),
2901 (char *) reply_buf
, size
, NULL
);
2902 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
2908 end
= (char *) reply_buf
+ size
;
2909 ceph_decode_64_safe(&p
, end
, parent_spec
->pool_id
, out_err
);
2910 if (parent_spec
->pool_id
== CEPH_NOPOOL
)
2911 goto out
; /* No parent? No problem. */
2913 /* The ceph file layout needs to fit pool id in 32 bits */
2916 if (WARN_ON(parent_spec
->pool_id
> (u64
) U32_MAX
))
2919 image_id
= ceph_extract_encoded_string(&p
, end
, NULL
, GFP_KERNEL
);
2920 if (IS_ERR(image_id
)) {
2921 ret
= PTR_ERR(image_id
);
2924 parent_spec
->image_id
= image_id
;
2925 ceph_decode_64_safe(&p
, end
, parent_spec
->snap_id
, out_err
);
2926 ceph_decode_64_safe(&p
, end
, overlap
, out_err
);
2928 rbd_dev
->parent_overlap
= overlap
;
2929 rbd_dev
->parent_spec
= parent_spec
;
2930 parent_spec
= NULL
; /* rbd_dev now owns this */
2935 rbd_spec_put(parent_spec
);
2940 static char *rbd_dev_image_name(struct rbd_device
*rbd_dev
)
2942 size_t image_id_size
;
2947 void *reply_buf
= NULL
;
2949 char *image_name
= NULL
;
2952 rbd_assert(!rbd_dev
->spec
->image_name
);
2954 len
= strlen(rbd_dev
->spec
->image_id
);
2955 image_id_size
= sizeof (__le32
) + len
;
2956 image_id
= kmalloc(image_id_size
, GFP_KERNEL
);
2961 end
= (char *) image_id
+ image_id_size
;
2962 ceph_encode_string(&p
, end
, rbd_dev
->spec
->image_id
, (u32
) len
);
2964 size
= sizeof (__le32
) + RBD_IMAGE_NAME_LEN_MAX
;
2965 reply_buf
= kmalloc(size
, GFP_KERNEL
);
2969 ret
= rbd_obj_method_sync(rbd_dev
, RBD_DIRECTORY
,
2970 "rbd", "dir_get_name",
2971 image_id
, image_id_size
,
2972 (char *) reply_buf
, size
, NULL
);
2976 end
= (char *) reply_buf
+ size
;
2977 image_name
= ceph_extract_encoded_string(&p
, end
, &len
, GFP_KERNEL
);
2978 if (IS_ERR(image_name
))
2981 dout("%s: name is %s len is %zd\n", __func__
, image_name
, len
);
2990 * When a parent image gets probed, we only have the pool, image,
2991 * and snapshot ids but not the names of any of them. This call
2992 * is made later to fill in those names. It has to be done after
2993 * rbd_dev_snaps_update() has completed because some of the
2994 * information (in particular, snapshot name) is not available
2997 static int rbd_dev_probe_update_spec(struct rbd_device
*rbd_dev
)
2999 struct ceph_osd_client
*osdc
;
3001 void *reply_buf
= NULL
;
3004 if (rbd_dev
->spec
->pool_name
)
3005 return 0; /* Already have the names */
3007 /* Look up the pool name */
3009 osdc
= &rbd_dev
->rbd_client
->client
->osdc
;
3010 name
= ceph_pg_pool_name_by_id(osdc
->osdmap
, rbd_dev
->spec
->pool_id
);
3012 rbd_warn(rbd_dev
, "there is no pool with id %llu",
3013 rbd_dev
->spec
->pool_id
); /* Really a BUG() */
3017 rbd_dev
->spec
->pool_name
= kstrdup(name
, GFP_KERNEL
);
3018 if (!rbd_dev
->spec
->pool_name
)
3021 /* Fetch the image name; tolerate failure here */
3023 name
= rbd_dev_image_name(rbd_dev
);
3025 rbd_dev
->spec
->image_name
= (char *) name
;
3027 rbd_warn(rbd_dev
, "unable to get image name");
3029 /* Look up the snapshot name. */
3031 name
= rbd_snap_name(rbd_dev
, rbd_dev
->spec
->snap_id
);
3033 rbd_warn(rbd_dev
, "no snapshot with id %llu",
3034 rbd_dev
->spec
->snap_id
); /* Really a BUG() */
3038 rbd_dev
->spec
->snap_name
= kstrdup(name
, GFP_KERNEL
);
3039 if(!rbd_dev
->spec
->snap_name
)
3045 kfree(rbd_dev
->spec
->pool_name
);
3046 rbd_dev
->spec
->pool_name
= NULL
;
3051 static int rbd_dev_v2_snap_context(struct rbd_device
*rbd_dev
, u64
*ver
)
3060 struct ceph_snap_context
*snapc
;
3064 * We'll need room for the seq value (maximum snapshot id),
3065 * snapshot count, and array of that many snapshot ids.
3066 * For now we have a fixed upper limit on the number we're
3067 * prepared to receive.
3069 size
= sizeof (__le64
) + sizeof (__le32
) +
3070 RBD_MAX_SNAP_COUNT
* sizeof (__le64
);
3071 reply_buf
= kzalloc(size
, GFP_KERNEL
);
3075 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
3076 "rbd", "get_snapcontext",
3078 reply_buf
, size
, ver
);
3079 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3085 end
= (char *) reply_buf
+ size
;
3086 ceph_decode_64_safe(&p
, end
, seq
, out
);
3087 ceph_decode_32_safe(&p
, end
, snap_count
, out
);
3090 * Make sure the reported number of snapshot ids wouldn't go
3091 * beyond the end of our buffer. But before checking that,
3092 * make sure the computed size of the snapshot context we
3093 * allocate is representable in a size_t.
3095 if (snap_count
> (SIZE_MAX
- sizeof (struct ceph_snap_context
))
3100 if (!ceph_has_room(&p
, end
, snap_count
* sizeof (__le64
)))
3103 size
= sizeof (struct ceph_snap_context
) +
3104 snap_count
* sizeof (snapc
->snaps
[0]);
3105 snapc
= kmalloc(size
, GFP_KERNEL
);
3111 atomic_set(&snapc
->nref
, 1);
3113 snapc
->num_snaps
= snap_count
;
3114 for (i
= 0; i
< snap_count
; i
++)
3115 snapc
->snaps
[i
] = ceph_decode_64(&p
);
3117 rbd_dev
->header
.snapc
= snapc
;
3119 dout(" snap context seq = %llu, snap_count = %u\n",
3120 (unsigned long long) seq
, (unsigned int) snap_count
);
3128 static char *rbd_dev_v2_snap_name(struct rbd_device
*rbd_dev
, u32 which
)
3138 size
= sizeof (__le32
) + RBD_MAX_SNAP_NAME_LEN
;
3139 reply_buf
= kmalloc(size
, GFP_KERNEL
);
3141 return ERR_PTR(-ENOMEM
);
3143 snap_id
= cpu_to_le64(rbd_dev
->header
.snapc
->snaps
[which
]);
3144 ret
= rbd_obj_method_sync(rbd_dev
, rbd_dev
->header_name
,
3145 "rbd", "get_snapshot_name",
3146 (char *) &snap_id
, sizeof (snap_id
),
3147 reply_buf
, size
, NULL
);
3148 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3153 end
= (char *) reply_buf
+ size
;
3154 snap_name
= ceph_extract_encoded_string(&p
, end
, NULL
, GFP_KERNEL
);
3155 if (IS_ERR(snap_name
)) {
3156 ret
= PTR_ERR(snap_name
);
3159 dout(" snap_id 0x%016llx snap_name = %s\n",
3160 (unsigned long long) le64_to_cpu(snap_id
), snap_name
);
3168 return ERR_PTR(ret
);
3171 static char *rbd_dev_v2_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
3172 u64
*snap_size
, u64
*snap_features
)
3178 snap_id
= rbd_dev
->header
.snapc
->snaps
[which
];
3179 ret
= _rbd_dev_v2_snap_size(rbd_dev
, snap_id
, &order
, snap_size
);
3181 return ERR_PTR(ret
);
3182 ret
= _rbd_dev_v2_snap_features(rbd_dev
, snap_id
, snap_features
);
3184 return ERR_PTR(ret
);
3186 return rbd_dev_v2_snap_name(rbd_dev
, which
);
3189 static char *rbd_dev_snap_info(struct rbd_device
*rbd_dev
, u32 which
,
3190 u64
*snap_size
, u64
*snap_features
)
3192 if (rbd_dev
->image_format
== 1)
3193 return rbd_dev_v1_snap_info(rbd_dev
, which
,
3194 snap_size
, snap_features
);
3195 if (rbd_dev
->image_format
== 2)
3196 return rbd_dev_v2_snap_info(rbd_dev
, which
,
3197 snap_size
, snap_features
);
3198 return ERR_PTR(-EINVAL
);
3201 static int rbd_dev_v2_refresh(struct rbd_device
*rbd_dev
, u64
*hver
)
3206 down_write(&rbd_dev
->header_rwsem
);
3208 /* Grab old order first, to see if it changes */
3210 obj_order
= rbd_dev
->header
.obj_order
,
3211 ret
= rbd_dev_v2_image_size(rbd_dev
);
3214 if (rbd_dev
->header
.obj_order
!= obj_order
) {
3218 rbd_update_mapping_size(rbd_dev
);
3220 ret
= rbd_dev_v2_snap_context(rbd_dev
, hver
);
3221 dout("rbd_dev_v2_snap_context returned %d\n", ret
);
3224 ret
= rbd_dev_snaps_update(rbd_dev
);
3225 dout("rbd_dev_snaps_update returned %d\n", ret
);
3228 ret
= rbd_dev_snaps_register(rbd_dev
);
3229 dout("rbd_dev_snaps_register returned %d\n", ret
);
3231 up_write(&rbd_dev
->header_rwsem
);
3237 * Scan the rbd device's current snapshot list and compare it to the
3238 * newly-received snapshot context. Remove any existing snapshots
3239 * not present in the new snapshot context. Add a new snapshot for
3240 * any snaphots in the snapshot context not in the current list.
3241 * And verify there are no changes to snapshots we already know
3244 * Assumes the snapshots in the snapshot context are sorted by
3245 * snapshot id, highest id first. (Snapshots in the rbd_dev's list
3246 * are also maintained in that order.)
3248 static int rbd_dev_snaps_update(struct rbd_device
*rbd_dev
)
3250 struct ceph_snap_context
*snapc
= rbd_dev
->header
.snapc
;
3251 const u32 snap_count
= snapc
->num_snaps
;
3252 struct list_head
*head
= &rbd_dev
->snaps
;
3253 struct list_head
*links
= head
->next
;
3256 dout("%s: snap count is %u\n", __func__
, (unsigned int) snap_count
);
3257 while (index
< snap_count
|| links
!= head
) {
3259 struct rbd_snap
*snap
;
3262 u64 snap_features
= 0;
3264 snap_id
= index
< snap_count
? snapc
->snaps
[index
]
3266 snap
= links
!= head
? list_entry(links
, struct rbd_snap
, node
)
3268 rbd_assert(!snap
|| snap
->id
!= CEPH_NOSNAP
);
3270 if (snap_id
== CEPH_NOSNAP
|| (snap
&& snap
->id
> snap_id
)) {
3271 struct list_head
*next
= links
->next
;
3274 * A previously-existing snapshot is not in
3275 * the new snap context.
3277 * If the now missing snapshot is the one the
3278 * image is mapped to, clear its exists flag
3279 * so we can avoid sending any more requests
3282 if (rbd_dev
->spec
->snap_id
== snap
->id
)
3283 clear_bit(RBD_DEV_FLAG_EXISTS
, &rbd_dev
->flags
);
3284 rbd_remove_snap_dev(snap
);
3285 dout("%ssnap id %llu has been removed\n",
3286 rbd_dev
->spec
->snap_id
== snap
->id
?
3288 (unsigned long long) snap
->id
);
3290 /* Done with this list entry; advance */
3296 snap_name
= rbd_dev_snap_info(rbd_dev
, index
,
3297 &snap_size
, &snap_features
);
3298 if (IS_ERR(snap_name
))
3299 return PTR_ERR(snap_name
);
3301 dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count
,
3302 (unsigned long long) snap_id
);
3303 if (!snap
|| (snap_id
!= CEPH_NOSNAP
&& snap
->id
< snap_id
)) {
3304 struct rbd_snap
*new_snap
;
3306 /* We haven't seen this snapshot before */
3308 new_snap
= __rbd_add_snap_dev(rbd_dev
, snap_name
,
3309 snap_id
, snap_size
, snap_features
);
3310 if (IS_ERR(new_snap
)) {
3311 int err
= PTR_ERR(new_snap
);
3313 dout(" failed to add dev, error %d\n", err
);
3318 /* New goes before existing, or at end of list */
3320 dout(" added dev%s\n", snap
? "" : " at end\n");
3322 list_add_tail(&new_snap
->node
, &snap
->node
);
3324 list_add_tail(&new_snap
->node
, head
);
3326 /* Already have this one */
3328 dout(" already present\n");
3330 rbd_assert(snap
->size
== snap_size
);
3331 rbd_assert(!strcmp(snap
->name
, snap_name
));
3332 rbd_assert(snap
->features
== snap_features
);
3334 /* Done with this list entry; advance */
3336 links
= links
->next
;
3339 /* Advance to the next entry in the snapshot context */
3343 dout("%s: done\n", __func__
);
3349 * Scan the list of snapshots and register the devices for any that
3350 * have not already been registered.
3352 static int rbd_dev_snaps_register(struct rbd_device
*rbd_dev
)
3354 struct rbd_snap
*snap
;
3357 dout("%s:\n", __func__
);
3358 if (WARN_ON(!device_is_registered(&rbd_dev
->dev
)))
3361 list_for_each_entry(snap
, &rbd_dev
->snaps
, node
) {
3362 if (!rbd_snap_registered(snap
)) {
3363 ret
= rbd_register_snap_dev(snap
, &rbd_dev
->dev
);
3368 dout("%s: returning %d\n", __func__
, ret
);
3373 static int rbd_bus_add_dev(struct rbd_device
*rbd_dev
)
3378 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
3380 dev
= &rbd_dev
->dev
;
3381 dev
->bus
= &rbd_bus_type
;
3382 dev
->type
= &rbd_device_type
;
3383 dev
->parent
= &rbd_root_dev
;
3384 dev
->release
= rbd_dev_release
;
3385 dev_set_name(dev
, "%d", rbd_dev
->dev_id
);
3386 ret
= device_register(dev
);
3388 mutex_unlock(&ctl_mutex
);
3393 static void rbd_bus_del_dev(struct rbd_device
*rbd_dev
)
3395 device_unregister(&rbd_dev
->dev
);
3398 static atomic64_t rbd_dev_id_max
= ATOMIC64_INIT(0);
3401 * Get a unique rbd identifier for the given new rbd_dev, and add
3402 * the rbd_dev to the global list. The minimum rbd id is 1.
3404 static void rbd_dev_id_get(struct rbd_device
*rbd_dev
)
3406 rbd_dev
->dev_id
= atomic64_inc_return(&rbd_dev_id_max
);
3408 spin_lock(&rbd_dev_list_lock
);
3409 list_add_tail(&rbd_dev
->node
, &rbd_dev_list
);
3410 spin_unlock(&rbd_dev_list_lock
);
3411 dout("rbd_dev %p given dev id %llu\n", rbd_dev
,
3412 (unsigned long long) rbd_dev
->dev_id
);
3416 * Remove an rbd_dev from the global list, and record that its
3417 * identifier is no longer in use.
3419 static void rbd_dev_id_put(struct rbd_device
*rbd_dev
)
3421 struct list_head
*tmp
;
3422 int rbd_id
= rbd_dev
->dev_id
;
3425 rbd_assert(rbd_id
> 0);
3427 dout("rbd_dev %p released dev id %llu\n", rbd_dev
,
3428 (unsigned long long) rbd_dev
->dev_id
);
3429 spin_lock(&rbd_dev_list_lock
);
3430 list_del_init(&rbd_dev
->node
);
3433 * If the id being "put" is not the current maximum, there
3434 * is nothing special we need to do.
3436 if (rbd_id
!= atomic64_read(&rbd_dev_id_max
)) {
3437 spin_unlock(&rbd_dev_list_lock
);
3442 * We need to update the current maximum id. Search the
3443 * list to find out what it is. We're more likely to find
3444 * the maximum at the end, so search the list backward.
3447 list_for_each_prev(tmp
, &rbd_dev_list
) {
3448 struct rbd_device
*rbd_dev
;
3450 rbd_dev
= list_entry(tmp
, struct rbd_device
, node
);
3451 if (rbd_dev
->dev_id
> max_id
)
3452 max_id
= rbd_dev
->dev_id
;
3454 spin_unlock(&rbd_dev_list_lock
);
3457 * The max id could have been updated by rbd_dev_id_get(), in
3458 * which case it now accurately reflects the new maximum.
3459 * Be careful not to overwrite the maximum value in that
3462 atomic64_cmpxchg(&rbd_dev_id_max
, rbd_id
, max_id
);
3463 dout(" max dev id has been reset\n");
3467 * Skips over white space at *buf, and updates *buf to point to the
3468 * first found non-space character (if any). Returns the length of
3469 * the token (string of non-white space characters) found. Note
3470 * that *buf must be terminated with '\0'.
3472 static inline size_t next_token(const char **buf
)
3475 * These are the characters that produce nonzero for
3476 * isspace() in the "C" and "POSIX" locales.
3478 const char *spaces
= " \f\n\r\t\v";
3480 *buf
+= strspn(*buf
, spaces
); /* Find start of token */
3482 return strcspn(*buf
, spaces
); /* Return token length */
3486 * Finds the next token in *buf, and if the provided token buffer is
3487 * big enough, copies the found token into it. The result, if
3488 * copied, is guaranteed to be terminated with '\0'. Note that *buf
3489 * must be terminated with '\0' on entry.
3491 * Returns the length of the token found (not including the '\0').
3492 * Return value will be 0 if no token is found, and it will be >=
3493 * token_size if the token would not fit.
3495 * The *buf pointer will be updated to point beyond the end of the
3496 * found token. Note that this occurs even if the token buffer is
3497 * too small to hold it.
3499 static inline size_t copy_token(const char **buf
,
3505 len
= next_token(buf
);
3506 if (len
< token_size
) {
3507 memcpy(token
, *buf
, len
);
3508 *(token
+ len
) = '\0';
3516 * Finds the next token in *buf, dynamically allocates a buffer big
3517 * enough to hold a copy of it, and copies the token into the new
3518 * buffer. The copy is guaranteed to be terminated with '\0'. Note
3519 * that a duplicate buffer is created even for a zero-length token.
3521 * Returns a pointer to the newly-allocated duplicate, or a null
3522 * pointer if memory for the duplicate was not available. If
3523 * the lenp argument is a non-null pointer, the length of the token
3524 * (not including the '\0') is returned in *lenp.
3526 * If successful, the *buf pointer will be updated to point beyond
3527 * the end of the found token.
3529 * Note: uses GFP_KERNEL for allocation.
3531 static inline char *dup_token(const char **buf
, size_t *lenp
)
3536 len
= next_token(buf
);
3537 dup
= kmemdup(*buf
, len
+ 1, GFP_KERNEL
);
3540 *(dup
+ len
) = '\0';
3550 * Parse the options provided for an "rbd add" (i.e., rbd image
3551 * mapping) request. These arrive via a write to /sys/bus/rbd/add,
3552 * and the data written is passed here via a NUL-terminated buffer.
3553 * Returns 0 if successful or an error code otherwise.
3555 * The information extracted from these options is recorded in
3556 * the other parameters which return dynamically-allocated
3559 * The address of a pointer that will refer to a ceph options
3560 * structure. Caller must release the returned pointer using
3561 * ceph_destroy_options() when it is no longer needed.
3563 * Address of an rbd options pointer. Fully initialized by
3564 * this function; caller must release with kfree().
3566 * Address of an rbd image specification pointer. Fully
3567 * initialized by this function based on parsed options.
3568 * Caller must release with rbd_spec_put().
3570 * The options passed take this form:
3571 * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
3574 * A comma-separated list of one or more monitor addresses.
3575 * A monitor address is an ip address, optionally followed
3576 * by a port number (separated by a colon).
3577 * I.e.: ip1[:port1][,ip2[:port2]...]
3579 * A comma-separated list of ceph and/or rbd options.
3581 * The name of the rados pool containing the rbd image.
3583 * The name of the image in that pool to map.
3585 * An optional snapshot id. If provided, the mapping will
3586 * present data from the image at the time that snapshot was
3587 * created. The image head is used if no snapshot id is
3588 * provided. Snapshot mappings are always read-only.
3590 static int rbd_add_parse_args(const char *buf
,
3591 struct ceph_options
**ceph_opts
,
3592 struct rbd_options
**opts
,
3593 struct rbd_spec
**rbd_spec
)
3597 const char *mon_addrs
;
3598 size_t mon_addrs_size
;
3599 struct rbd_spec
*spec
= NULL
;
3600 struct rbd_options
*rbd_opts
= NULL
;
3601 struct ceph_options
*copts
;
3604 /* The first four tokens are required */
3606 len
= next_token(&buf
);
3608 rbd_warn(NULL
, "no monitor address(es) provided");
3612 mon_addrs_size
= len
+ 1;
3616 options
= dup_token(&buf
, NULL
);
3620 rbd_warn(NULL
, "no options provided");
3624 spec
= rbd_spec_alloc();
3628 spec
->pool_name
= dup_token(&buf
, NULL
);
3629 if (!spec
->pool_name
)
3631 if (!*spec
->pool_name
) {
3632 rbd_warn(NULL
, "no pool name provided");
3636 spec
->image_name
= dup_token(&buf
, NULL
);
3637 if (!spec
->image_name
)
3639 if (!*spec
->image_name
) {
3640 rbd_warn(NULL
, "no image name provided");
3645 * Snapshot name is optional; default is to use "-"
3646 * (indicating the head/no snapshot).
3648 len
= next_token(&buf
);
3650 buf
= RBD_SNAP_HEAD_NAME
; /* No snapshot supplied */
3651 len
= sizeof (RBD_SNAP_HEAD_NAME
) - 1;
3652 } else if (len
> RBD_MAX_SNAP_NAME_LEN
) {
3653 ret
= -ENAMETOOLONG
;
3656 spec
->snap_name
= kmemdup(buf
, len
+ 1, GFP_KERNEL
);
3657 if (!spec
->snap_name
)
3659 *(spec
->snap_name
+ len
) = '\0';
3661 /* Initialize all rbd options to the defaults */
3663 rbd_opts
= kzalloc(sizeof (*rbd_opts
), GFP_KERNEL
);
3667 rbd_opts
->read_only
= RBD_READ_ONLY_DEFAULT
;
3669 copts
= ceph_parse_options(options
, mon_addrs
,
3670 mon_addrs
+ mon_addrs_size
- 1,
3671 parse_rbd_opts_token
, rbd_opts
);
3672 if (IS_ERR(copts
)) {
3673 ret
= PTR_ERR(copts
);
3694 * An rbd format 2 image has a unique identifier, distinct from the
3695 * name given to it by the user. Internally, that identifier is
3696 * what's used to specify the names of objects related to the image.
3698 * A special "rbd id" object is used to map an rbd image name to its
3699 * id. If that object doesn't exist, then there is no v2 rbd image
3700 * with the supplied name.
3702 * This function will record the given rbd_dev's image_id field if
3703 * it can be determined, and in that case will return 0. If any
3704 * errors occur a negative errno will be returned and the rbd_dev's
3705 * image_id field will be unchanged (and should be NULL).
3707 static int rbd_dev_image_id(struct rbd_device
*rbd_dev
)
3716 * When probing a parent image, the image id is already
3717 * known (and the image name likely is not). There's no
3718 * need to fetch the image id again in this case.
3720 if (rbd_dev
->spec
->image_id
)
3724 * First, see if the format 2 image id file exists, and if
3725 * so, get the image's persistent id from it.
3727 size
= sizeof (RBD_ID_PREFIX
) + strlen(rbd_dev
->spec
->image_name
);
3728 object_name
= kmalloc(size
, GFP_NOIO
);
3731 sprintf(object_name
, "%s%s", RBD_ID_PREFIX
, rbd_dev
->spec
->image_name
);
3732 dout("rbd id object name is %s\n", object_name
);
3734 /* Response will be an encoded string, which includes a length */
3736 size
= sizeof (__le32
) + RBD_IMAGE_ID_LEN_MAX
;
3737 response
= kzalloc(size
, GFP_NOIO
);
3743 ret
= rbd_obj_method_sync(rbd_dev
, object_name
,
3746 response
, RBD_IMAGE_ID_LEN_MAX
, NULL
);
3747 dout("%s: rbd_obj_method_sync returned %d\n", __func__
, ret
);
3752 rbd_dev
->spec
->image_id
= ceph_extract_encoded_string(&p
,
3753 p
+ RBD_IMAGE_ID_LEN_MAX
,
3755 if (IS_ERR(rbd_dev
->spec
->image_id
)) {
3756 ret
= PTR_ERR(rbd_dev
->spec
->image_id
);
3757 rbd_dev
->spec
->image_id
= NULL
;
3759 dout("image_id is %s\n", rbd_dev
->spec
->image_id
);
3768 static int rbd_dev_v1_probe(struct rbd_device
*rbd_dev
)
3773 /* Version 1 images have no id; empty string is used */
3775 rbd_dev
->spec
->image_id
= kstrdup("", GFP_KERNEL
);
3776 if (!rbd_dev
->spec
->image_id
)
3779 /* Record the header object name for this rbd image. */
3781 size
= strlen(rbd_dev
->spec
->image_name
) + sizeof (RBD_SUFFIX
);
3782 rbd_dev
->header_name
= kmalloc(size
, GFP_KERNEL
);
3783 if (!rbd_dev
->header_name
) {
3787 sprintf(rbd_dev
->header_name
, "%s%s",
3788 rbd_dev
->spec
->image_name
, RBD_SUFFIX
);
3790 /* Populate rbd image metadata */
3792 ret
= rbd_read_header(rbd_dev
, &rbd_dev
->header
);
3796 /* Version 1 images have no parent (no layering) */
3798 rbd_dev
->parent_spec
= NULL
;
3799 rbd_dev
->parent_overlap
= 0;
3801 rbd_dev
->image_format
= 1;
3803 dout("discovered version 1 image, header name is %s\n",
3804 rbd_dev
->header_name
);
3809 kfree(rbd_dev
->header_name
);
3810 rbd_dev
->header_name
= NULL
;
3811 kfree(rbd_dev
->spec
->image_id
);
3812 rbd_dev
->spec
->image_id
= NULL
;
3817 static int rbd_dev_v2_probe(struct rbd_device
*rbd_dev
)
3824 * Image id was filled in by the caller. Record the header
3825 * object name for this rbd image.
3827 size
= sizeof (RBD_HEADER_PREFIX
) + strlen(rbd_dev
->spec
->image_id
);
3828 rbd_dev
->header_name
= kmalloc(size
, GFP_KERNEL
);
3829 if (!rbd_dev
->header_name
)
3831 sprintf(rbd_dev
->header_name
, "%s%s",
3832 RBD_HEADER_PREFIX
, rbd_dev
->spec
->image_id
);
3834 /* Get the size and object order for the image */
3836 ret
= rbd_dev_v2_image_size(rbd_dev
);
3840 /* Get the object prefix (a.k.a. block_name) for the image */
3842 ret
= rbd_dev_v2_object_prefix(rbd_dev
);
3846 /* Get the and check features for the image */
3848 ret
= rbd_dev_v2_features(rbd_dev
);
3852 /* If the image supports layering, get the parent info */
3854 if (rbd_dev
->header
.features
& RBD_FEATURE_LAYERING
) {
3855 ret
= rbd_dev_v2_parent_info(rbd_dev
);
3860 /* crypto and compression type aren't (yet) supported for v2 images */
3862 rbd_dev
->header
.crypt_type
= 0;
3863 rbd_dev
->header
.comp_type
= 0;
3865 /* Get the snapshot context, plus the header version */
3867 ret
= rbd_dev_v2_snap_context(rbd_dev
, &ver
);
3870 rbd_dev
->header
.obj_version
= ver
;
3872 rbd_dev
->image_format
= 2;
3874 dout("discovered version 2 image, header name is %s\n",
3875 rbd_dev
->header_name
);
3879 rbd_dev
->parent_overlap
= 0;
3880 rbd_spec_put(rbd_dev
->parent_spec
);
3881 rbd_dev
->parent_spec
= NULL
;
3882 kfree(rbd_dev
->header_name
);
3883 rbd_dev
->header_name
= NULL
;
3884 kfree(rbd_dev
->header
.object_prefix
);
3885 rbd_dev
->header
.object_prefix
= NULL
;
3890 static int rbd_dev_probe_finish(struct rbd_device
*rbd_dev
)
3894 /* no need to lock here, as rbd_dev is not registered yet */
3895 ret
= rbd_dev_snaps_update(rbd_dev
);
3899 ret
= rbd_dev_probe_update_spec(rbd_dev
);
3903 ret
= rbd_dev_set_mapping(rbd_dev
);
3907 /* generate unique id: find highest unique id, add one */
3908 rbd_dev_id_get(rbd_dev
);
3910 /* Fill in the device name, now that we have its id. */
3911 BUILD_BUG_ON(DEV_NAME_LEN
3912 < sizeof (RBD_DRV_NAME
) + MAX_INT_FORMAT_WIDTH
);
3913 sprintf(rbd_dev
->name
, "%s%d", RBD_DRV_NAME
, rbd_dev
->dev_id
);
3915 /* Get our block major device number. */
3917 ret
= register_blkdev(0, rbd_dev
->name
);
3920 rbd_dev
->major
= ret
;
3922 /* Set up the blkdev mapping. */
3924 ret
= rbd_init_disk(rbd_dev
);
3926 goto err_out_blkdev
;
3928 ret
= rbd_bus_add_dev(rbd_dev
);
3933 * At this point cleanup in the event of an error is the job
3934 * of the sysfs code (initiated by rbd_bus_del_dev()).
3936 down_write(&rbd_dev
->header_rwsem
);
3937 ret
= rbd_dev_snaps_register(rbd_dev
);
3938 up_write(&rbd_dev
->header_rwsem
);
3942 ret
= rbd_dev_header_watch_sync(rbd_dev
, 1);
3946 /* Everything's ready. Announce the disk to the world. */
3948 add_disk(rbd_dev
->disk
);
3950 pr_info("%s: added with size 0x%llx\n", rbd_dev
->disk
->disk_name
,
3951 (unsigned long long) rbd_dev
->mapping
.size
);
3955 /* this will also clean up rest of rbd_dev stuff */
3957 rbd_bus_del_dev(rbd_dev
);
3961 rbd_free_disk(rbd_dev
);
3963 unregister_blkdev(rbd_dev
->major
, rbd_dev
->name
);
3965 rbd_dev_id_put(rbd_dev
);
3967 rbd_remove_all_snaps(rbd_dev
);
3973 * Probe for the existence of the header object for the given rbd
3974 * device. For format 2 images this includes determining the image
3977 static int rbd_dev_probe(struct rbd_device
*rbd_dev
)
3982 * Get the id from the image id object. If it's not a
3983 * format 2 image, we'll get ENOENT back, and we'll assume
3984 * it's a format 1 image.
3986 ret
= rbd_dev_image_id(rbd_dev
);
3988 ret
= rbd_dev_v1_probe(rbd_dev
);
3990 ret
= rbd_dev_v2_probe(rbd_dev
);
3992 dout("probe failed, returning %d\n", ret
);
3997 ret
= rbd_dev_probe_finish(rbd_dev
);
3999 rbd_header_free(&rbd_dev
->header
);
4004 static ssize_t
rbd_add(struct bus_type
*bus
,
4008 struct rbd_device
*rbd_dev
= NULL
;
4009 struct ceph_options
*ceph_opts
= NULL
;
4010 struct rbd_options
*rbd_opts
= NULL
;
4011 struct rbd_spec
*spec
= NULL
;
4012 struct rbd_client
*rbdc
;
4013 struct ceph_osd_client
*osdc
;
4016 if (!try_module_get(THIS_MODULE
))
4019 /* parse add command */
4020 rc
= rbd_add_parse_args(buf
, &ceph_opts
, &rbd_opts
, &spec
);
4022 goto err_out_module
;
4024 rbdc
= rbd_get_client(ceph_opts
);
4029 ceph_opts
= NULL
; /* rbd_dev client now owns this */
4032 osdc
= &rbdc
->client
->osdc
;
4033 rc
= ceph_pg_poolid_by_name(osdc
->osdmap
, spec
->pool_name
);
4035 goto err_out_client
;
4036 spec
->pool_id
= (u64
) rc
;
4038 /* The ceph file layout needs to fit pool id in 32 bits */
4040 if (WARN_ON(spec
->pool_id
> (u64
) U32_MAX
)) {
4042 goto err_out_client
;
4045 rbd_dev
= rbd_dev_create(rbdc
, spec
);
4047 goto err_out_client
;
4048 rbdc
= NULL
; /* rbd_dev now owns this */
4049 spec
= NULL
; /* rbd_dev now owns this */
4051 rbd_dev
->mapping
.read_only
= rbd_opts
->read_only
;
4053 rbd_opts
= NULL
; /* done with this */
4055 rc
= rbd_dev_probe(rbd_dev
);
4057 goto err_out_rbd_dev
;
4061 rbd_dev_destroy(rbd_dev
);
4063 rbd_put_client(rbdc
);
4066 ceph_destroy_options(ceph_opts
);
4070 module_put(THIS_MODULE
);
4072 dout("Error adding device %s\n", buf
);
4074 return (ssize_t
) rc
;
4077 static struct rbd_device
*__rbd_get_dev(unsigned long dev_id
)
4079 struct list_head
*tmp
;
4080 struct rbd_device
*rbd_dev
;
4082 spin_lock(&rbd_dev_list_lock
);
4083 list_for_each(tmp
, &rbd_dev_list
) {
4084 rbd_dev
= list_entry(tmp
, struct rbd_device
, node
);
4085 if (rbd_dev
->dev_id
== dev_id
) {
4086 spin_unlock(&rbd_dev_list_lock
);
4090 spin_unlock(&rbd_dev_list_lock
);
4094 static void rbd_dev_release(struct device
*dev
)
4096 struct rbd_device
*rbd_dev
= dev_to_rbd_dev(dev
);
4098 if (rbd_dev
->watch_event
)
4099 rbd_dev_header_watch_sync(rbd_dev
, 0);
4101 /* clean up and free blkdev */
4102 rbd_free_disk(rbd_dev
);
4103 unregister_blkdev(rbd_dev
->major
, rbd_dev
->name
);
4105 /* release allocated disk header fields */
4106 rbd_header_free(&rbd_dev
->header
);
4108 /* done with the id, and with the rbd_dev */
4109 rbd_dev_id_put(rbd_dev
);
4110 rbd_assert(rbd_dev
->rbd_client
!= NULL
);
4111 rbd_dev_destroy(rbd_dev
);
4113 /* release module ref */
4114 module_put(THIS_MODULE
);
4117 static ssize_t
rbd_remove(struct bus_type
*bus
,
4121 struct rbd_device
*rbd_dev
= NULL
;
4126 rc
= strict_strtoul(buf
, 10, &ul
);
4130 /* convert to int; abort if we lost anything in the conversion */
4131 target_id
= (int) ul
;
4132 if (target_id
!= ul
)
4135 mutex_lock_nested(&ctl_mutex
, SINGLE_DEPTH_NESTING
);
4137 rbd_dev
= __rbd_get_dev(target_id
);
4143 spin_lock_irq(&rbd_dev
->lock
);
4144 if (rbd_dev
->open_count
)
4147 set_bit(RBD_DEV_FLAG_REMOVING
, &rbd_dev
->flags
);
4148 spin_unlock_irq(&rbd_dev
->lock
);
4152 rbd_remove_all_snaps(rbd_dev
);
4153 rbd_bus_del_dev(rbd_dev
);
4156 mutex_unlock(&ctl_mutex
);
4162 * create control files in sysfs
4165 static int rbd_sysfs_init(void)
4169 ret
= device_register(&rbd_root_dev
);
4173 ret
= bus_register(&rbd_bus_type
);
4175 device_unregister(&rbd_root_dev
);
4180 static void rbd_sysfs_cleanup(void)
4182 bus_unregister(&rbd_bus_type
);
4183 device_unregister(&rbd_root_dev
);
4186 static int __init
rbd_init(void)
4190 if (!libceph_compatible(NULL
)) {
4191 rbd_warn(NULL
, "libceph incompatibility (quitting)");
4195 rc
= rbd_sysfs_init();
4198 pr_info("loaded " RBD_DRV_NAME_LONG
"\n");
4202 static void __exit
rbd_exit(void)
4204 rbd_sysfs_cleanup();
4207 module_init(rbd_init
);
4208 module_exit(rbd_exit
);
4210 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
4211 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
4212 MODULE_DESCRIPTION("rados block device");
4214 /* following authorship retained from original osdblk.c */
4215 MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
4217 MODULE_LICENSE("GPL");