mainlining shenanigans

Chris Mason 70dec8079d Btrfs: extent_io and extent_state optimizations ... The end_bio routines are changed to take a pointer to the extent state struct, and the state tree is walked in order to set/clear appropriate bits as IO completes. This greatly reduces the number of rbtree searches done by the end_bio handlers, and reduces lock contention. The extent_io releasepage function is changed to avoid expensive searches for locked state. Signed-off-by: Chris Mason <chris.mason@oracle.com>		2008-09-25 11:03:59 -04:00
fs/btrfs	Btrfs: extent_io and extent_state optimizations	2008-09-25 11:03:59 -04:00