diff options
| author | Josh Durgin <josh.durgin@dreamhost.com> | 2011-12-05 10:35:04 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:51:18 -0800 |
| commit | 929333aa674e6c1b3026a3b3c8f27907e9a7de5b (patch) | |
| tree | 3846998f54e74534980bda70471082815e6ddcbc /drivers/block | |
| parent | 7272b7d3db9160716acce4ae387cf98fd24ff820 (diff) | |
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>
(cherry picked from commit a51aa0c042fa39946dd017d5f91a073300a71577)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/block')
| -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 52a045b11d4..0ac989cf240 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1720,6 +1720,8 @@ static int __rbd_update_snaps(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; @@ -1728,8 +1730,6 @@ static int __rbd_update_snaps(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) @@ -1844,8 +1844,13 @@ 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, |