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Btrfs: add a check to decide if we should defrag the range
authorLiu Bo <liubo2009@cn.fujitsu.com>
Thu, 29 Mar 2012 13:57:45 +0000 (09:57 -0400)
committerChris Mason <chris.mason@oracle.com>
Thu, 29 Mar 2012 13:57:45 +0000 (09:57 -0400)
If our file's layout is as follows:
| hole | data1 | hole | data2 |

we do not need to defrag this file, because this file has holes and
cannot be merged into one extent.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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