Btrfs: use flag EXTENT_DEFRAG for snapshot-aware defrag

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We're going to use this flag EXTENT_DEFRAG to indicate which range
belongs to defragment so that we can implement snapshow-aware defrag:

We set the EXTENT_DEFRAG flag when dirtying the extents that need
defragmented, so later on writeback thread can differentiate between
normal writeback and writeback started by defragmentation.

Original-Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>

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Liu Bo 2012-09-05 19:10:51 -06:00 • committed by Chris Mason

parent 3d6b5c3b5c

commit 9e8a4a8b0b

5 changed files with 28 additions and 14 deletions

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8

fs/btrfs/extent_io.c

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2

fs/btrfs/extent_io.h

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4

fs/btrfs/file.c

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20

fs/btrfs/inode.c

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8

fs/btrfs/ioctl.c

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