[PATCH] xfs: lock the rt summary inode when unmapping realtime extents

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When we're deleting realtime extents, lock the summary inode
in case we need to update the summary info.  This prevents an
assert on the rsumip inode lock on a debug kernel.

(Same idea as "xfs: lock rt summary inode on allocation".)

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_bmap.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 97820c1..9c7227b 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -5524,6 +5524,8 @@ __xfs_bunmapi(
 		 */
 		xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
 		xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
+		xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL);
+		xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
 	}
 
 	extno = 0;

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