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Btrfs: Add shared reference cache

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Btrfs has a cache of reference counts in leaves, allowing it to
avoid reading tree leaves while deleting snapshots.  To reduce
contention with multiple subvolumes, this cache is private to each
subvolume.

This patch adds shared reference cache support. The new space
balancing code plays with multiple subvols at the same time, So
the old per-subvol reference cache is not well suited.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Zheng Yan 2008-09-26 10:04:53 -04:00 • committed by Chris Mason
commit e465768938
6 changed files with 71 additions and 34 deletions
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