From ac14876cf9255175bf3bdad645bf8aa2b8fb2d7c Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Mon, 20 May 2013 09:51:12 +1000 Subject: xfs: fix missing KM_NOFS tags to keep lockdep happy There are several places where we use KM_SLEEP allocation contexts and use the fact that they are called from transaction context to add KM_NOFS where appropriate. Unfortunately, there are several places where the code makes this assumption but can be called from outside transaction context but with filesystem locks held. These places need explicit KM_NOFS annotations to avoid lockdep complaining about reclaim contexts. Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- fs/xfs/xfs_dir2_leaf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/xfs/xfs_dir2_leaf.c') diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c index 721ba2fe8e54..da71a1819d78 100644 --- a/fs/xfs/xfs_dir2_leaf.c +++ b/fs/xfs/xfs_dir2_leaf.c @@ -1336,7 +1336,7 @@ xfs_dir2_leaf_getdents( mp->m_sb.sb_blocksize); map_info = kmem_zalloc(offsetof(struct xfs_dir2_leaf_map_info, map) + (length * sizeof(struct xfs_bmbt_irec)), - KM_SLEEP); + KM_SLEEP | KM_NOFS); map_info->map_size = length; /* -- cgit v1.2.3 From 34eefc06a06f496b92c3267a0601129a932c7174 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Thu, 27 Jun 2013 16:04:47 +1000 Subject: xfs: plug directory buffer readahead Similar to bulkstat inode chunk readahead, we need to plug directory data buffer readahead during getdents to ensure that we can merge adjacent readahead requests and sort out of order requests optimally before they are dispatched. This improves the readahead efficiency and reduces the IO load it generates as the IO patterns are significantly better for both contiguous and fragmented directories. Signed-off-by: Dave Chinner Reviewed-by: Mark Tinguely Signed-off-by: Ben Myers --- fs/xfs/xfs_dir2_leaf.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/xfs/xfs_dir2_leaf.c') diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c index da71a1819d78..bb22aac9fc01 100644 --- a/fs/xfs/xfs_dir2_leaf.c +++ b/fs/xfs/xfs_dir2_leaf.c @@ -1108,6 +1108,7 @@ xfs_dir2_leaf_readbuf( struct xfs_mount *mp = dp->i_mount; struct xfs_buf *bp = *bpp; struct xfs_bmbt_irec *map = mip->map; + struct blk_plug plug; int error = 0; int length; int i; @@ -1236,6 +1237,7 @@ xfs_dir2_leaf_readbuf( /* * Do we need more readahead? */ + blk_start_plug(&plug); for (mip->ra_index = mip->ra_offset = i = 0; mip->ra_want > mip->ra_current && i < mip->map_blocks; i += mp->m_dirblkfsbs) { @@ -1287,6 +1289,7 @@ xfs_dir2_leaf_readbuf( } } } + blk_finish_plug(&plug); out: *bpp = bp; -- cgit v1.2.3