linux-ext4 - Re: [PATCH] ext4: extents: Modify the return value variable type and initialize the assignment

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Date:   Fri, 17 Feb 2023 15:40:20 +0100
From:   Jan Kara <jack@...e.cz>
To:     Li kunyu <kunyu@...china.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: extents: Modify the return value variable type and
 initialize the assignment

On Thu 09-02-23 03:34:43, Li kunyu wrote:
> Modify the return value variable to be consistent with the return value
> type of the function, and modify the initialization assignment. Under
> certain circumstances, the constant return value is not required.
> 
> Signed-off-by: Li kunyu <kunyu@...china.com>

Hum, I don't think this really improves anything. All the functions seem to
return 0 or error code (and ext4_fallocate()) as well so the size of return
value does not really matter and we usually just use int in this case.

								Honza

> ---
>  fs/ext4/extents.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 9de1c9d1a13d..debeb2e7a162 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -4676,7 +4676,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
>  	struct inode *inode = file_inode(file);
>  	loff_t new_size = 0;
>  	unsigned int max_blocks;
> -	int ret = 0;
> +	long ret = -EOPNOTSUPP;
>  	int flags;
>  	ext4_lblk_t lblk;
>  	unsigned int blkbits = inode->i_blkbits;
> @@ -4689,13 +4689,13 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
>  	 */
>  	if (IS_ENCRYPTED(inode) &&
>  	    (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
> -		return -EOPNOTSUPP;
> +		return ret;
>  
>  	/* Return error if mode is not supported */
>  	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
>  		     FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
>  		     FALLOC_FL_INSERT_RANGE))
> -		return -EOPNOTSUPP;
> +		return ret;
>  
>  	inode_lock(inode);
>  	ret = ext4_convert_inline_data(inode);
> -- 
> 2.18.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR