From: Dave Chinner <dchinner@redhat.com>
Date: Sun, 19 May 2013 23:51:12 +0000 (+1000)
Subject: xfs: fix missing KM_NOFS tags to keep lockdep happy
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ac14876cf9255175bf3bdad645bf8aa2b8fb2d7c;p=openwrt%2Fstaging%2Fblogic.git

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 <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
---

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 82b70bda9f47..0d2554299688 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1649,7 +1649,7 @@ xfs_alloc_buftarg(
 {
 	xfs_buftarg_t		*btp;
 
-	btp = kmem_zalloc(sizeof(*btp), KM_SLEEP);
+	btp = kmem_zalloc(sizeof(*btp), KM_SLEEP | KM_NOFS);
 
 	btp->bt_mount = mp;
 	btp->bt_dev =  bdev->bd_dev;
diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 9b26a99ebfe9..41ea7e14a7b6 100644
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -2464,7 +2464,8 @@ xfs_buf_map_from_irec(
 	ASSERT(nirecs >= 1);
 
 	if (nirecs > 1) {
-		map = kmem_zalloc(nirecs * sizeof(struct xfs_buf_map), KM_SLEEP);
+		map = kmem_zalloc(nirecs * sizeof(struct xfs_buf_map),
+				  KM_SLEEP | KM_NOFS);
 		if (!map)
 			return ENOMEM;
 		*mapp = map;
@@ -2520,7 +2521,8 @@ xfs_dabuf_map(
 		 * Optimize the one-block case.
 		 */
 		if (nfsb != 1)
-			irecs = kmem_zalloc(sizeof(irec) * nfsb, KM_SLEEP);
+			irecs = kmem_zalloc(sizeof(irec) * nfsb,
+					    KM_SLEEP | KM_NOFS);
 
 		nirecs = nfsb;
 		error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb, irecs,
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;
 
 	/*
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index e3d0b85d852b..d0833b54e55d 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -139,7 +139,7 @@ xlog_cil_prepare_log_vecs(
 
 		new_lv = kmem_zalloc(sizeof(*new_lv) +
 				niovecs * sizeof(struct xfs_log_iovec),
-				KM_SLEEP);
+				KM_SLEEP|KM_NOFS);
 
 		/* The allocated iovec region lies beyond the log vector. */
 		new_lv->lv_iovecp = (struct xfs_log_iovec *)&new_lv[1];