linux-kernel - Re: [PATCH] fs: clean up after mandatory file locking support removal

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Date:   Tue, 24 Aug 2021 07:56:08 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: clean up after mandatory file locking support
 removal

On Tue, 2021-08-24 at 13:12 +0200, Lukas Bulwahn wrote:
> Commit 3efee0567b4a ("fs: remove mandatory file locking support") removes
> some operations in functions rw_verify_area() and remap_verify_area().
> 
> As these functions are now simplified, do some syntactic clean-up as
> follow-up to the removal as well, which was pointed out by compiler
> warnings and static analysis.
> 
> No functional change.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> ---
> Jeff, please pick this clean-up patch on top of the commit above.
> 
>  fs/read_write.c  | 10 +++-------
>  fs/remap_range.c |  2 --
>  2 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/read_write.c b/fs/read_write.c
> index ffe821b8588e..af057c57bdc6 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -365,12 +365,8 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
>  
>  int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
>  {
> -	struct inode *inode;
> -	int retval = -EINVAL;
> -
> -	inode = file_inode(file);
>  	if (unlikely((ssize_t) count < 0))
> -		return retval;
> +		return -EINVAL;
>  
>  	/*
>  	 * ranged mandatory locking does not apply to streams - it makes sense
> @@ -381,12 +377,12 @@ int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t
>  
>  		if (unlikely(pos < 0)) {
>  			if (!unsigned_offsets(file))
> -				return retval;
> +				return -EINVAL;
>  			if (count >= -pos) /* both values are in 0..LLONG_MAX */
>  				return -EOVERFLOW;
>  		} else if (unlikely((loff_t) (pos + count) < 0)) {
>  			if (!unsigned_offsets(file))
> -				return retval;
> +				return -EINVAL;
>  		}
>  	}
>  
> diff --git a/fs/remap_range.c b/fs/remap_range.c
> index ec6d26c526b3..6d4a9beaa097 100644
> --- a/fs/remap_range.c
> +++ b/fs/remap_range.c
> @@ -99,8 +99,6 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
>  static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
>  			     bool write)
>  {
> -	struct inode *inode = file_inode(file);
> -
>  	if (unlikely(pos < 0 || len < 0))
>  		return -EINVAL;
>  

Thanks Lukas,

I had already removed the second hunk, but I merged read_write.c part
into my queue for v5.15. It should show up in linux-next soon.
-- 
Jeff Layton <jlayton@...nel.org>