linux-kernel - [PATCH] ramfs: skip mknod if inode already exists.

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Date:   Wed, 16 Jun 2021 10:53:12 +0800
From:   Chen Li <chenli@...ontech.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ramfs: skip mknod if inode already exists.


It's possible we try to mknod a dentry, which have
already bound to an inode, just skip it.

Signed-off-by: Chen Li <chenli@...ontech.com>
---
 fs/ramfs/inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 9ebd17d7befb..6cb1de521142 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -106,6 +106,8 @@ ramfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 {
 	struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
 	int error = -ENOSPC;
+	if (dentry->d_inode)
+		return -EEXIST;
 
 	if (inode) {
 		d_instantiate(dentry, inode);
-- 
2.32.0