tree 9c40b5ea6a16a096b56d096f0b155dd8de1511c8
parent 9c552857bd264021879bb2d9ef8d51f4ce1858c0
author Tejun Heo <tj@kernel.org> 1420575271 -0500
committer Tejun Heo <tj@kernel.org> 1420575271 -0500

writeback: make __writeback_single_inode() cgroup writeback aware

Metadata is always dirtied against the root cgroup and should thus be
written out only by the root cgroup writeback.  This patch updates
__writeback_single_inode() so that it skips writing out metadata if
the writeback is for a non-root cgroup.  wbc_skip_metadata() is added
to decide whether to skip metadata writeback.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>