tree ffc3fe0a05e0fd7e55b92e3ef8bad42d3c73d68c
parent ce1953325662fa597197ce728e4195582fc21c8d
author Josef Bacik <jbacik@fusionio.com> 1348780050 -0400
committer Chris Mason <chris.mason@fusionio.com> 1349788541 -0400

Btrfs: cache extent state when writing out dirty metadata pages

Everytime we write out dirty pages we search for an offset in the tree,
convert the bits in the state, and then when we wait we search for the
offset again and clear the bits.  So for every dirty range in the io tree we
are doing 4 rb searches, which is suboptimal.  With this patch we are only
doing 2 searches for every cycle (modulo weird things happening).  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>