Btrfs: unplug every once and a while
authorChris Mason <chris.mason@oracle.com>
Thu, 15 Dec 2011 20:38:41 +0000 (15:38 -0500)
committerChris Mason <chris.mason@oracle.com>
Thu, 15 Dec 2011 20:38:41 +0000 (15:38 -0500)
The btrfs io submission threads can build up massive plug lists.  This
keeps things more reasonable so we don't hand over huge dumps of IO at
once.

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

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