linux-kernel - Re: [PATCH v7 12/22] ext2: Remove ext2_xip_verify

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Date:	Wed, 9 Apr 2014 11:52:54 +0200
From:	Jan Kara <jack@...e.cz>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, willy@...ux.intel.com
Subject: Re: [PATCH v7 12/22] ext2: Remove ext2_xip_verify_sb()

On Sun 23-03-14 15:08:38, Matthew Wilcox wrote:
> Jan Kara pointed out that calling ext2_xip_verify_sb() in ext2_remount()
> doesn't make sense, since changing the XIP option on remount isn't
> allowed.  It also doesn't make sense to re-check whether blocksize is
> supported since it can't change between mounts.
> 
> Replace the call to ext2_xip_verify_sb() in ext2_fill_super() with the
> equivalent check and delete the definition.
  Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

  One nit below:
...
> @@ -1273,22 +1275,11 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
>  	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
>  		((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
>  
> -	ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
> -				    EXT2_MOUNT_XIP if not */
> -
> -	if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
> -		ext2_msg(sb, KERN_WARNING,
> -			"warning: unsupported blocksize for xip");
> -		err = -EINVAL;
> -		goto restore_opts;
> -	}
> -
>  	es = sbi->s_es;
> -	if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) {
> +	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_XIP) {
>  		ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
>  			 "xip flag with busy inodes while remounting");
> -		sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
> -		sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
> +		sbi->s_mount_opt ^= EXT2_MOUNT_XIP;
  Although this is correct, it was easier to see that the previous code is
correct so I'd prefer if you kept it that way.

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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