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Btrfs: Add a leaf reference cache

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Much of the IO done while dropping snapshots is done looking up
leaves in the filesystem trees to see if they point to any extents and
to drop the references on any extents found.

This creates a cache so that IO isn't required.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan Zheng 2008-07-28 15:32:19 -04:00 • committed by Chris Mason
commit 31153d8128
8 changed files with 476 additions and 33 deletions
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