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[PATCH 4/5] xfs: use xfs_ilock_map_shared in xfs_attr_get

To: xfs@xxxxxxxxxxx
Subject: [PATCH 4/5] xfs: use xfs_ilock_map_shared in xfs_attr_get
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 05 Dec 2013 07:58:34 -0800
Delivered-to: xfs@xxxxxxxxxxx
References: <20131205155830.620826868@xxxxxxxxxxxxxxxxxxxxxx>
User-agent: quilt/0.60-1
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>

diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index b861270..5343034 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -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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