Btrfs: Only open block devices once during mount -o subvol=
authorChris Mason <chris.mason@oracle.com>
Thu, 8 May 2008 19:05:58 +0000 (15:05 -0400)
committerChris Mason <chris.mason@oracle.com>
Thu, 25 Sep 2008 15:04:02 +0000 (11:04 -0400)
btrfs_open_devices needed a check to see if the device was already
open.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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