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rbd: fix a bug in resizing a mapping 

When a snapshot context update occurs, rbd_update_mapping_size() is
called to set the capacity of the disk to record the updated
size of the image in case it has changed.

There's a bug though.  The mapping size is in units of *bytes*.  The
code that updates the mapping size field is assigning a value that
has been scaled down to *sectors*.

Fix that.  Also, check to see if the size has actually changed, and
don't bother updating things (specifically, calling set_capacity())
if it has not.

This resolves:
    http://tracker.ceph.com/issues/4833

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-04-26 15:44:35 -05:00 committed by Sage Weil
parent 2e9f7f1c0d
commit e28626a08b
1 changed files with 8 additions and 6 deletions
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14
drivers/block/rbd.c
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@ -3034,15 +3034,17 @@ static void rbd_remove_all_snaps(struct rbd_device *rbd_dev)
static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
{
sector_t size;
if (rbd_dev->spec->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);
if (rbd_dev->mapping.size != rbd_dev->header.image_size) {
sector_t size;
rbd_dev->mapping.size = rbd_dev->header.image_size;
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
dout("setting size to %llu sectors", (unsigned long long)size);
set_capacity(rbd_dev->disk, size);
}
}
/*