linux-kernel - Re: [PATCH v2 4/5] btrfs: don't allow -C or +c chattrs on a swap file

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Date:	Fri, 21 Nov 2014 18:29:08 +0100
From:	David Sterba <dsterba@...e.cz>
To:	Omar Sandoval <osandov@...ndov.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-nfs@...r.kernel.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH v2 4/5] btrfs: don't allow -C or +c chattrs on a swap file

On Fri, Nov 21, 2014 at 02:08:30AM -0800, Omar Sandoval wrote:
> @@ -293,14 +293,21 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
>  		}
>  	} else {

You can put the condition here, instead of shifting the nested block.

	} else if (!IS_SWAPFILE(inode)) {

>  		/*
> -		 * Revert back under same assuptions as above
> +		 * swap_activate checks that we don't swapon a copy-on-write
> +		 * file, but we must also make sure that it doesn't become
> +		 * copy-on-write.
>  		 */
> -		if (S_ISREG(mode)) {
> -			if (inode->i_size == 0)
> -				ip->flags &= ~(BTRFS_INODE_NODATACOW
> -				             | BTRFS_INODE_NODATASUM);
> -		} else {
> -			ip->flags &= ~BTRFS_INODE_NODATACOW;
> +		if (!IS_SWAPFILE(inode)) {
> +			/*
> +			 * Revert back under same assumptions as above
> +			 */
> +			if (S_ISREG(mode)) {
> +				if (inode->i_size == 0)
> +					ip->flags &= ~(BTRFS_INODE_NODATACOW |
> +						       BTRFS_INODE_NODATASUM);
> +			} else {
> +				ip->flags &= ~BTRFS_INODE_NODATACOW;
> +			}
>  		}
>  	}
--
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