diff options
| author | Josh Durgin | 2011-12-05 19:35:04 +0100 |
|---|---|---|
| committer | Sage Weil | 2012-07-31 03:15:38 +0200 |
| commit | a51aa0c042fa39946dd017d5f91a073300a71577 (patch) | |
| tree | 4afc8c5ba8508f5ccfe07aefe8eeb9b98044d6d4 /drivers/block/rbd.c | |
| parent | rbd: only reset capacity when pointing to head (diff) | |
| download | kernel-qcow2-linux-a51aa0c042fa39946dd017d5f91a073300a71577.tar.gz kernel-qcow2-linux-a51aa0c042fa39946dd017d5f91a073300a71577.tar.xz kernel-qcow2-linux-a51aa0c042fa39946dd017d5f91a073300a71577.zip | |
rbd: expose the correct size of the device in sysfs
If an image was mapped to a snapshot, the size of the head version
would be shown. Protect capacity with header_rwsem, since it may
change.
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Diffstat (limited to 'drivers/block/rbd.c')
| -rw-r--r-- | drivers/block/rbd.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index f171cebabda9..9c3a1db49ac4 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1724,6 +1724,8 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev) if (ret < 0) return ret; + down_write(&rbd_dev->header_rwsem); + /* resized? */ if (rbd_dev->snap_id == CEPH_NOSNAP) { sector_t size = (sector_t) h.image_size / SECTOR_SIZE; @@ -1732,8 +1734,6 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev) set_capacity(rbd_dev->disk, size); } - down_write(&rbd_dev->header_rwsem); - snap_seq = rbd_dev->header.snapc->seq; if (rbd_dev->header.total_snaps && rbd_dev->header.snapc->snaps[0] == snap_seq) @@ -1853,8 +1853,13 @@ static ssize_t rbd_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); + sector_t size; + + down_read(&rbd_dev->header_rwsem); + size = get_capacity(rbd_dev->disk); + up_read(&rbd_dev->header_rwsem); - return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); + return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); } static ssize_t rbd_major_show(struct device *dev, |