tree 32896ba4b98e34067bc26834c8cc26bb13106f9c
parent fc4adbff823f76577ece26dcb88bf6f8392dbd43
author Chris Mason <clm@fb.com> 1400704551 -0700
committer Chris Mason <clm@fb.com> 1402359658 -0700

Btrfs: split up __extent_writepage to lower stack usage

__extent_writepage has two unrelated parts.  First it does the delayed
allocation dance and second it does the mapping and IO for the page
we're actually writing.

This splits it up into those two parts so the stack from one doesn't
impact the stack from the other.

Signed-off-by: Chris Mason <clm@fb.com>