[PATCH 5/7] xfs: use xfs_ilock_map_shared in xfs_attr_get

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We might not have read in the extent list at this point, so make sure we
take the ilock exclusively if we have to do so.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: xfs/fs/xfs/xfs_attr.c
===================================================================
--- xfs.orig/fs/xfs/xfs_attr.c	2013-12-05 22:19:26.087829792 +0100
+++ xfs/fs/xfs/xfs_attr.c	2013-12-05 22:23:54.307824288 +0100
@@ -164,6 +164,7 @@ xfs_attr_get(
 {
 	int		error;
 	struct xfs_name	xname;
+	uint		lock_mode;
 
 	XFS_STATS_INC(xs_attr_get);
 
@@ -174,9 +175,9 @@ xfs_attr_get(
 	if (error)
 		return error;
 
-	xfs_ilock(ip, XFS_ILOCK_SHARED);
+	lock_mode = xfs_ilock_map_shared(ip);
 	error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
-	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	xfs_iunlock_map_shared(ip, lock_mode);
 	return(error);
 }
 

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