linux-kernel - Re: [PATCH 4/7] shmem: support RENAME

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Date:	Thu, 24 Jul 2014 04:08:30 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	Miklos Szeredi <mszeredi@...e.cz>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 4/7] shmem: support RENAME_NOREPLACE

On Wed, 23 Jul 2014, Miklos Szeredi wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
> 
> Expand noreplace_rename2() because next patch will implement one more flag.

noreplace_rename2()??  I understand the code better than this comment.

> 
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
> Cc: Hugh Dickins <hughd@...gle.com>

Acked-by: Hugh Dickins <hughd@...gle.com>

though I wouldn't object to a comment, perhaps just in the commit message,
like you have in ext4: Existence checking was done by the VFS, otherwise
"RENAME_NOREPLACE" is equivalent to regular rename.

> ---
>  mm/shmem.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 1140f49b6ded..791b05514f9a 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2022,11 +2022,14 @@ static int shmem_rmdir(struct inode *dir, struct dentry *dentry)
>   * it exists so that the VFS layer correctly free's it when it
>   * gets overwritten.
>   */
> -static int shmem_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
> +static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags)
>  {
>  	struct inode *inode = old_dentry->d_inode;
>  	int they_are_dirs = S_ISDIR(inode->i_mode);
>  
> +	if (flags & ~(RENAME_NOREPLACE))
> +		return -EINVAL;
> +
>  	if (!simple_empty(new_dentry))
>  		return -ENOTEMPTY;
>  
> @@ -2709,7 +2712,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
>  	.mkdir		= shmem_mkdir,
>  	.rmdir		= shmem_rmdir,
>  	.mknod		= shmem_mknod,
> -	.rename		= shmem_rename,
> +	.rename2	= shmem_rename2,
>  	.tmpfile	= shmem_tmpfile,
>  #endif
>  #ifdef CONFIG_TMPFS_XATTR
> -- 
> 1.8.1.4
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