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rbd: record mapped size 

Add the size of the mapped image to the set of mapping-specific
fields in an rbd_device, and use it when setting the capacity of the
disk.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-08-30 14:42:15 -05:00
Родитель f84344f334
Коммит 99c1f08f64
1 изменённых файлов: 14 добавлений и 13 удалений
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27
drivers/block/rbd.c
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@ -151,6 +151,7 @@ struct rbd_snap {
struct rbd_mapping {
char *snap_name;
u64 snap_id;
u64 size;
bool snap_exists;
bool read_only;
};
@ -643,7 +644,7 @@ static int snap_by_name(struct rbd_image_header *header, const char *snap_name,
return -ENOENT;
}
static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size)
static int rbd_header_set_snap(struct rbd_device *rbd_dev)
{
int ret;
@ -652,19 +653,16 @@ static int rbd_header_set_snap(struct rbd_device *rbd_dev, u64 *size)
if (!memcmp(rbd_dev->mapping.snap_name, RBD_SNAP_HEAD_NAME,
sizeof (RBD_SNAP_HEAD_NAME))) {
rbd_dev->mapping.snap_id = CEPH_NOSNAP;
rbd_dev->mapping.size = rbd_dev->header.image_size;
rbd_dev->mapping.snap_exists = false;
rbd_dev->mapping.read_only = rbd_dev->rbd_opts.read_only;
if (size)
*size = rbd_dev->header.image_size;
} else {
u64 snap_id = 0;
ret = snap_by_name(&rbd_dev->header,
rbd_dev->mapping.snap_name,
&snap_id, size);
&rbd_dev->mapping.snap_id,
&rbd_dev->mapping.size);
if (ret < 0)
goto done;
rbd_dev->mapping.snap_id = snap_id;
rbd_dev->mapping.snap_exists = true;
rbd_dev->mapping.read_only = true;
}
@ -1830,8 +1828,12 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
if (rbd_dev->mapping.snap_id == CEPH_NOSNAP) {
sector_t size = (sector_t) h.image_size / SECTOR_SIZE;
dout("setting size to %llu sectors", (unsigned long long) size);
set_capacity(rbd_dev->disk, size);
if (size != (sector_t) rbd_dev->mapping.size) {
dout("setting size to %llu sectors",
(unsigned long long) size);
rbd_dev->mapping.size = (u64) size;
set_capacity(rbd_dev->disk, size);
}
}
/* rbd_dev->header.object_prefix shouldn't change */
@ -1875,7 +1877,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
struct request_queue *q;
int rc;
u64 segment_size;
u64 total_size = 0;
/* contact OSD, request size info about the object being mapped */
rc = rbd_read_header(rbd_dev, &rbd_dev->header);
@ -1887,7 +1888,7 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
if (rc)
return rc;
rc = rbd_header_set_snap(rbd_dev, &total_size);
rc = rbd_header_set_snap(rbd_dev);
if (rc)
return rc;
@ -1928,11 +1929,11 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
rbd_dev->disk = disk;
/* finally, announce the disk to the world */
set_capacity(disk, total_size / SECTOR_SIZE);
set_capacity(disk, (sector_t) rbd_dev->mapping.size / SECTOR_SIZE);
add_disk(disk);
pr_info("%s: added with size 0x%llx\n",
disk->disk_name, (unsigned long long)total_size);
disk->disk_name, (unsigned long long) rbd_dev->mapping.size);
return 0;
out_disk: