[Ocfs2-devel] [PATCH 2/2] ocfs2: clear dinode links count in case of error

[Joseph Qi]

In ocfs2_mknod(), if error occurs after dinode successfully allocated,
ocfs2 i_links_count will not be 0.
So even we clear inode i_nlink before iput in error handling, it still
won't wipe inode since we'll refresh inode from dinode during inode
lock. So just like clear inode i_nlink, we clear ocfs2 i_links_count as
well.
Also do the same change for ocfs2_symlink().

Reported-by: Yan Wang <wangyan122 at huawei.com>
Signed-off-by: Joseph Qi <joseph.qi at linux.alibaba.com>
---
 fs/ocfs2/namei.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 1a97e167b219..05f32989bad6 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -232,6 +232,7 @@ static int ocfs2_mknod(struct user_namespace *mnt_userns,
 	handle_t *handle = NULL;
 	struct ocfs2_super *osb;
 	struct ocfs2_dinode *dirfe;
+	struct ocfs2_dinode *fe = NULL;
 	struct buffer_head *new_fe_bh = NULL;
 	struct inode *inode = NULL;
 	struct ocfs2_alloc_context *inode_ac = NULL;
@@ -382,6 +383,7 @@ static int ocfs2_mknod(struct user_namespace *mnt_userns,
 		goto leave;
 	}
 
+	fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
 	if (S_ISDIR(mode)) {
 		status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 					    new_fe_bh, data_ac, meta_ac);
@@ -454,8 +456,11 @@ static int ocfs2_mknod(struct user_namespace *mnt_userns,
 leave:
 	if (status < 0 && did_quota_inode)
 		dquot_free_inode(inode);
-	if (handle)
+	if (handle) {
+		if (status < 0 && fe)
+			ocfs2_set_links_count(fe, 0);
 		ocfs2_commit_trans(osb, handle);
+	}
 
 	ocfs2_inode_unlock(dir, 1);
 	if (did_block_signals)
@@ -2019,8 +2024,11 @@ static int ocfs2_symlink(struct user_namespace *mnt_userns,
 					ocfs2_clusters_to_bytes(osb->sb, 1));
 	if (status < 0 && did_quota_inode)
 		dquot_free_inode(inode);
-	if (handle)
+	if (handle) {
+		if (status < 0 && fe)
+			ocfs2_set_links_count(fe, 0);
 		ocfs2_commit_trans(osb, handle);
+	}
 
 	ocfs2_inode_unlock(dir, 1);
 	if (did_block_signals)
-- 
2.24.4