vfs, writeback: replace FS_CGROUP_WRITEBACK with MS_CGROUPWB
FS_CGROUP_WRITEBACK indicates whether a file_system_type supports
cgroup writeback; however, different super_blocks of the same
file_system_type may or may not support cgroup writeback depending on
filesystem options. This patch replaces FS_CGROUP_WRITEBACK with a
kernel-internal super_block->s_flags MS_CGROUPWB. The concatenated
and abbreviated name is for consistency with other MS_* flags.
ext2_fill_super() is updated to assert MS_CGROUPWB.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org
5 files changed
