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xfs: use xfs_ilock_attr_map_shared in xfs_attr_get 

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@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2013-12-06 12:30:15 -08:00 committed by Ben Myers
parent da51d32d45
commit 683cb94159
1 changed files with 3 additions and 2 deletions
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5
fs/xfs/xfs_attr.c
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@ -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_attr_map_shared(ip);
error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
xfs_iunlock(ip, lock_mode);
return(error);
}