Chris Mason dc7fdde39e Btrfs: reduce lock contention during extent insertion ...

We're spending huge amounts of time on lock contention during
end_io processing because we unconditionally assume we are overwriting
an existing extent in the file for each IO.

This checks to see if we are outside i_size, and if so, it uses a
less expensive readonly search of the btree to look for existing
extents.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

2012-04-27 14:51:05 -04:00

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