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Btrfs: Add run time btree defrag, and an ioctl to force btree defrag

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This adds two types of btree defrag, a run time form that tries to
defrag recently allocated blocks in the btree when they are still in ram,
and an ioctl that forces defrag of all btree blocks.

File data blocks are not defragged yet, but this can make a huge difference
in sequential btree reads.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-08-07 16:15:09 -04:00 • committed by David Woodhouse
commit 6702ed490c
11 changed files with 553 additions and 89 deletions
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