linux-ext4 - Re: [PATCH 4/4] ext4: implement ext4

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Date:	Fri, 04 Jul 2008 13:03:12 -0600
From:	Andreas Dilger <adilger@....com>
To:	Kalpak Shah <Kalpak.Shah@....com>
Cc:	Mark Fasheh <mfasheh@...e.com>, Eric Sandeen <sandeen@...hat.com>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] ext4: implement ext4_fiemap

On Jul 03, 2008  22:31 +0530, Kalpak Shah wrote:
> On Wed, 2008-06-25 at 15:19 -0700, Mark Fasheh wrote:
> > +int ext4_xattr_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo)
> > +{
> > +	/* in-inode? */
> > +	if (EXT4_I(inode)->i_state & EXT4_STATE_XATTR) {
> > +		struct ext4_iloc iloc;
> > +		int offset;	/* offset of xattr in inode */
> > +
> > +		physical = iloc.bh->b_blocknr << blockbits;
> > +		offset = EXT4_GOOD_OLD_INODE_SIZE +
> > +				EXT4_I(inode)->i_extra_isize;
>  
> @@ -3148,14 +3148,24 @@ int ext4_xattr_fiemap(struct inode *inod
>  		physical += offset;
>  		length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
>  		flags |= FIEMAP_EXTENT_DATA_INLINE;
> -	} else { /* external block */
> -		physical = EXT4_I(inode)->i_file_acl << blockbits;
> -		length = inode->i_sb->s_blocksize;
> +		if (EXT4_I(inode)->i_file_acl == 0)
> +			flags |= FIEMAP_EXTENT_LAST;
> +
> +		error = fiemap_fill_next_extent(fieinfo, 0, physical, length,
> +						flags, inode->i_sb->s_dev);
> +		if (error)
> +			goto out;
>  	}
>  
> +	/* external block */
> +	flags = FIEMAP_EXTENT_LAST;
> +	physical = EXT4_I(inode)->i_file_acl << blockbits;
> +	length = inode->i_sb->s_blocksize;
>  	if (physical)
> -		error = fiemap_fill_next_extent(fieinfo, 0, physical,
> -					length, flags, inode->i_sb->s_dev);
> +		error = fiemap_fill_next_extent(fieinfo, 0, physical, length,
> +						flags, inode->i_sb->s_dev);
> +
> +out:
>  	return (error < 0 ? error : 0);

It seems a bit unpleasant to have both logical offsets be 0 in this case.
I'd suggest having the in-inode logical offset be "offset", and the external
EA logical offset be "s_inode_size" or "s_blocksize".

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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