From: Tejun Heo Date: Tue, 16 Jun 2015 22:48:31 +0000 (-0400) Subject: vfs, writeback: replace FS_CGROUP_WRITEBACK with SB_I_CGROUPWB X-Git-Tag: omap-for-v4.2/fixes-rc1^2~117^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46b15caa7cb19b0f6e3bc8ebaee5bc1bb2e35110;p=pandora-kernel.git vfs, writeback: replace FS_CGROUP_WRITEBACK with SB_I_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 per-super_block flag. super_block->s_flags carries some internal flags in the high bits but it's exposd to userland through uapi header and running out of space anyway. This patch adds a new field super_block->s_iflags to carry kernel-internal flags. It is currently only used by the new SB_I_CGROUPWB flag whose concatenated and abbreviated name is for consistency with other super_block flags. ext2_fill_super() is updated to set SB_I_CGROUPWB. v2: Added super_block->s_iflags instead of stealing another high bit from sb->s_flags as suggested by Christoph and Jan. Signed-off-by: Tejun Heo Cc: Alexander Viro Cc: linux-fsdevel@vger.kernel.org Cc: Christoph Hellwig Cc: Jan Kara Cc: linux-ext4@vger.kernel.org Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- Reading git-diff-tree failed