__mpage_writepage() is used to implement mpage_writepages() which in
turn is used for ->writepages() of various filesystems.  All writeback
logic is now updated to handle cgroup writeback and the block cgroup
to issue IOs for is encoded in writeback_control and can be retrieved
from the inode; however, __mpage_writepage() currently ignores the
blkcg indicated by the inode and issues all bio's without explicit
blkcg association.

This patch updates __mpage_writepage() so that the issued bio's are
associated with inode_to_writeback_blkcg_css(inode).

v2: Updated for per-inode wb association.

Signed-off-by: Tejun Heo <t...@kernel.org>
Cc: Jens Axboe <ax...@kernel.dk>
Cc: Jan Kara <j...@suse.cz>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Alexander Viro <v...@zeniv.linux.org.uk>
 fs/mpage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/mpage.c b/fs/mpage.c
index 3e79220..a3ccb0b 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -605,6 +605,8 @@ alloc_new:
                                bio_get_nr_vecs(bdev), GFP_NOFS|__GFP_HIGH);
                if (bio == NULL)
                        goto confused;
+               bio_associate_blkcg(bio, inode_to_wb_blkcg_css(inode));

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