linux-kernel - Re: [RFC PATCH V2 10/12] fs/xfs: Fix truncate up

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Message-ID: <20200113222755.GP8247@magnolia>
Date:   Mon, 13 Jan 2020 14:27:55 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     ira.weiny@...el.com
Cc:     linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH V2 10/12] fs/xfs: Fix truncate up

On Fri, Jan 10, 2020 at 11:29:40AM -0800, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> When zeroing the end of a file we must account for bytes contained in
> the final page which are past EOF.
> 
> Extend the range passed to iomap_zero_range() to reach LLONG_MAX which
> will include all bytes of the final page.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
>  fs/xfs/xfs_iops.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index a2f2604c3187..a34b04e8ac9c 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -910,7 +910,7 @@ xfs_setattr_size(
>  	 */
>  	if (newsize > oldsize) {
>  		trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
> -		error = iomap_zero_range(inode, oldsize, newsize - oldsize,
> +		error = iomap_zero_range(inode, oldsize, LLONG_MAX - oldsize,

Huh?  Won't this cause the file size to be set to LLONG_MAX?

--D

>  				&did_zeroing, &xfs_buffered_write_iomap_ops);
>  	} else {
>  		error = iomap_truncate_page(inode, newsize, &did_zeroing,
> -- 
> 2.21.0
>