xfs: Hold inode locks in xfs_ialloc

Modify xfs_ialloc to hold locks after return.  Caller will be
responsible for manual unlock.  We will need this later to hold locks
across parent pointer operations

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Catherine Hoang <catherine.hoang@oracle.com>
[djwong: hold the parent ilocked across transaction rolls too]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 0f4cf41..47120b7 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -836,8 +836,10 @@ xfs_qm_qino_alloc(
 		ASSERT(xfs_is_shutdown(mp));
 		xfs_alert(mp, "%s failed (error %d)!", __func__, error);
 	}
-	if (need_alloc)
+	if (need_alloc) {
+		xfs_iunlock(*ipp, XFS_ILOCK_EXCL);
 		xfs_finish_inode_setup(*ipp);
+	}
 	return error;
 }