linux-kernel - Re: [PATCH 1/2] fs: Clean up mapping variable

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Date:   Mon, 11 Nov 2019 17:20:37 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     ira.weiny@...el.com
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/2] fs: Clean up mapping variable

On Mon, Nov 11, 2019 at 04:34:51PM -0800, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The mapping variable is not directly used in these functions.  Just
> remove the additional variable.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
>  fs/f2fs/data.c      | 3 +--
>  fs/iomap/swapfile.c | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index ba3bcf4c7889..3c7777bfae17 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3146,8 +3146,7 @@ int f2fs_migrate_page(struct address_space *mapping,
>  /* Copied from generic_swapfile_activate() to check any holes */
>  static int check_swap_activate(struct file *swap_file, unsigned int max)
>  {
> -	struct address_space *mapping = swap_file->f_mapping;
> -	struct inode *inode = mapping->host;
> +	struct inode *inode = swap_file->f_mapping->host;
>  	unsigned blocks_per_page;
>  	unsigned long page_no;
>  	unsigned blkbits;
> diff --git a/fs/iomap/swapfile.c b/fs/iomap/swapfile.c
> index a648dbf6991e..80571add0180 100644
> --- a/fs/iomap/swapfile.c
> +++ b/fs/iomap/swapfile.c
> @@ -140,8 +140,7 @@ int iomap_swapfile_activate(struct swap_info_struct *sis,
>  		.sis = sis,
>  		.lowest_ppage = (sector_t)-1ULL,
>  	};
> -	struct address_space *mapping = swap_file->f_mapping;
> -	struct inode *inode = mapping->host;
> +	struct inode *inode = swap_file->f_mapping->host;

For the iomap part,

Acked-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

>  	loff_t pos = 0;
>  	loff_t len = ALIGN_DOWN(i_size_read(inode), PAGE_SIZE);
>  	loff_t ret;
> -- 
> 2.20.1
>