tree 5c131edb13307bce302ba252a2624cca71176ba7
parent b1092c9af9ed88dd2fc8345d987dfb7efe7be8f0
author Kent Overstreet <kent.overstreet@gmail.com> 1515442885 -0800
committer Jens Axboe <axboe@kernel.dk> 1515443340 -0700

bcache: Fix, improve efficiency of closure_sync()

Eliminates cases where sync can race and fail to complete / get stuck.
Removes many status flags and simplifies entering-and-exiting closure
sleeping behaviors.

[mlyle: fixed conflicts due to changed return behavior in mainline.
extended commit comment, and squashed down two commits that were mostly
contradictory to get to this state.  Changed __set_current_state to
set_current_state per Jens review comment]

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Michael Lyle <mlyle@lyle.org>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>