tree 97cd8b1f9d8c0682c64303d45de1fb55925abcdf
parent fede766f28dd766d4e8feb321fdb19edb21ef6fb
author Chris Mason <chris.mason@oracle.com> 1335551489 -0400
committer Chris Mason <chris.mason@oracle.com> 1335552665 -0400

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>