From: Andrew Morton This one fixes four bugs. There are a few situation in there where writeback decides it is going to skip over a blockdev inode on the kernel-internal blockdev superblock. It presently does this by moving the blockdev inode onto the tail of the blockdev superblock's s_dirty. But a) this screws up s_dirty's reverse-time-orderedness and b) refiling the blockdev for writeback in another 30 second is rude. We should try again sooner than that. Fix all this up by using redirty_head(): move the blockdev inode onto the head of the blockdev superblock's s_dirty list for prompt writeback. Cc: Mike Waychison Signed-off-by: Andrew Morton --- fs/fs-writeback.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN fs/fs-writeback.c~writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7 fs/fs-writeback.c --- a/fs/fs-writeback.c~writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7 +++ a/fs/fs-writeback.c @@ -410,14 +410,14 @@ sync_sb_inodes(struct super_block *sb, s wbc->encountered_congestion = 1; if (!sb_is_blkdev_sb(sb)) break; /* Skip a congested fs */ - list_move(&inode->i_list, &sb->s_dirty); + redirty_head(inode); continue; /* Skip a congested blockdev */ } if (wbc->bdi && bdi != wbc->bdi) { if (!sb_is_blkdev_sb(sb)) break; /* fs has the wrong queue */ - list_move(&inode->i_list, &sb->s_dirty); + redirty_head(inode); continue; /* blockdev has wrong queue */ } _