linux-ext4 - Re: [PATCH 5/5] ext4: Get rid of ext4_fiemap_check

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Date:   Thu, 23 Apr 2020 13:20:14 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, jack@...e.cz, tytso@....edu,
        adilger@...ger.ca, darrick.wong@...cle.com, hch@...radead.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Murphy Zhou <jencce.kernel@...il.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org
Subject: Re: [PATCH 5/5] ext4: Get rid of ext4_fiemap_check_ranges

On Thu 23-04-20 16:17:57, Ritesh Harjani wrote:
> Now that fiemap_check_ranges() is available for other filesystems
> to use, so get rid of ext4's private version.
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>

Nice. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/ioctl.c | 25 +------------------------
>  1 file changed, 1 insertion(+), 24 deletions(-)
> 
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 76a2b5200ba3..6a7d7e9027cd 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -733,29 +733,6 @@ static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
>  		fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
>  }
>  
> -/* copied from fs/ioctl.c */
> -static int ext4_fiemap_check_ranges(struct super_block *sb,
> -			       u64 start, u64 len, u64 *new_len)
> -{
> -	u64 maxbytes = (u64) sb->s_maxbytes;
> -
> -	*new_len = len;
> -
> -	if (len == 0)
> -		return -EINVAL;
> -
> -	if (start > maxbytes)
> -		return -EFBIG;
> -
> -	/*
> -	 * Shrink request scope to what the fs can actually handle.
> -	 */
> -	if (len > maxbytes || (maxbytes - len) < start)
> -		*new_len = maxbytes - start;
> -
> -	return 0;
> -}
> -
>  /* So that the fiemap access checks can't overflow on 32 bit machines. */
>  #define FIEMAP_MAX_EXTENTS	(UINT_MAX / sizeof(struct fiemap_extent))
>  
> @@ -775,7 +752,7 @@ static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
>  	if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
>  		return -EINVAL;
>  
> -	error = ext4_fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
> +	error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
>  				    &len);
>  	if (error)
>  		return error;
> -- 
> 2.21.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR