[PATCH 3/5] xfs: use xfs_ilock_map_shared in xfs_qm_dqiterate

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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_qm.c
===================================================================
--- xfs.orig/fs/xfs/xfs_qm.c	2013-11-18 14:39:01.967589998 +0100
+++ xfs/fs/xfs/xfs_qm.c	2013-12-05 12:32:36.623617997 +0100
@@ -1193,16 +1193,18 @@ xfs_qm_dqiterate(
 	lblkno = 0;
 	maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 	do {
+		uint		lock_mode;
+
 		nmaps = XFS_DQITER_MAP_SIZE;
 		/*
 		 * We aren't changing the inode itself. Just changing
 		 * some of its data. No new blocks are added here, and
 		 * the inode is never added to the transaction.
 		 */
-		xfs_ilock(qip, XFS_ILOCK_SHARED);
+		lock_mode = xfs_ilock_map_shared(qip);
 		error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
 				       map, &nmaps, 0);
-		xfs_iunlock(qip, XFS_ILOCK_SHARED);
+		xfs_iunlock_map_shared(qip, lock_mode);
 		if (error)
 			break;
 

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