[PATCH v2] xfs: check if reserved free disk blocks is needed

[xiakaixu1987@gmail.com]

From: Kaixu Xia <kaixuxia@tencent.com>

We share an inode between gquota and pquota with the older
superblock that doesn't have separate pquotino, and for the
need_alloc == false case we don't need to call xfs_dir_ialloc()
function, so add the check if reserved free disk blocks is
needed.

Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
---
v2:
 - improve the commit log.

 fs/xfs/xfs_qm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 6678baa..b684b04 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -780,7 +780,8 @@ struct xfs_qm_isolate {
 	}
 
 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
-			XFS_QM_QINOCREATE_SPACE_RES(mp), 0, 0, &tp);
+			need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
+			0, 0, &tp);
 	if (error)
 		return error;
 
-- 
1.8.3.1