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authorJosh Durgin <josh.durgin@dreamhost.com>2011-12-05 10:35:04 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 08:51:18 -0800
commit929333aa674e6c1b3026a3b3c8f27907e9a7de5b (patch)
tree3846998f54e74534980bda70471082815e6ddcbc /drivers/block/rbd.c
parent7272b7d3db9160716acce4ae387cf98fd24ff820 (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/rbd.c')
-rw-r--r--drivers/block/rbd.c11
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,