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rbd: define rbd_update_mapping_size() 

Encapsulate the code that handles updating the size of a mapping
after an rbd image has been refreshed.  This is done in anticipation
of the next patch, which will make this common code for format 1 and
2 images.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-10-09 13:50:17 -07:00
parent 802c6d967f
commit 9478554ae5
1 changed files with 16 additions and 11 deletions
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27
drivers/block/rbd.c
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@ -1716,6 +1716,19 @@ static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev)
__rbd_remove_snap_dev(snap);
}
static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
{
sector_t size;
if (rbd_dev->mapping.snap_id != CEPH_NOSNAP)
return;
size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE;
dout("setting size to %llu sectors", (unsigned long long) size);
rbd_dev->mapping.size = (u64) size;
set_capacity(rbd_dev->disk, size);
}
/*
* only read the first part of the ondisk header, without the snaps info
*/
@ -1730,17 +1743,9 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
down_write(&rbd_dev->header_rwsem);
/* resized? */
if (rbd_dev->mapping.snap_id == CEPH_NOSNAP) {
sector_t size = (sector_t) h.image_size / SECTOR_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);
}
}
/* Update image size, and check for resize of mapped image */
rbd_dev->header.image_size = h.image_size;
rbd_update_mapping_size(rbd_dev);
/* rbd_dev->header.object_prefix shouldn't change */
kfree(rbd_dev->header.snap_sizes);