linux-kernel - Re: [PATCH] debugfs: remove inc_nlink in debugfs_create

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Date:   Sat, 22 Dec 2018 12:25:12 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     yangerkun <yangerkun@...wei.com>
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs: remove inc_nlink in debugfs_create_automount

On Sat, Dec 22, 2018 at 04:45:36PM +0800, yangerkun wrote:
> Remove inc_nlink in debugfs_create_automount, or this inode will never
> be free.
> 
> Signed-off-by: yangerkun <yangerkun@...wei.com>
> ---
>  fs/debugfs/inode.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
> index 13b01351dd1c..9294238e364f 100644
> --- a/fs/debugfs/inode.c
> +++ b/fs/debugfs/inode.c
> @@ -551,12 +551,11 @@ struct dentry *debugfs_create_automount(const char *name,
>  	if (unlikely(!inode))
>  		return failed_creating(dentry);
>  
> +	/* directory inodes start off with i_nlink == 2 (for "." entry) */
>  	make_empty_dir_inode(inode);
>  	inode->i_flags |= S_AUTOMOUNT;
>  	inode->i_private = data;
>  	dentry->d_fsdata = (void *)f;
> -	/* directory inodes start off with i_nlink == 2 (for "." entry) */
> -	inc_nlink(inode);

Again, have you tested this and how?  How did you find this issue?

thanks,

greg k-h