linux-ext4 - Re: [Bugme-new] [Bug 11266] New: unable to handle kernel paging request in ext2_free

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Date:	Mon, 18 Aug 2008 21:24:10 -0600
From:	Andreas Dilger <adilger@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Jan Kara <jack@...e.cz>, Sami Liedes <sliedes@...hut.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 11266] New: unable to handle kernel paging
	request in ext2_free_blocks

On Aug 18, 2008  22:21 +0530, Aneesh Kumar wrote:
> > +static int ext2_block_in_group(struct super_block *sb,
> > +			unsigned int block_group, ext2_fsblk_t block)
> > +{
> > +	if (block < ext2_group_first_block_no(sb, block_group))
> > +		return 0;
> > +	if (block >= ext2_group_first_block_no(sb, block_group) +
> > +	    EXT2_BLOCKS_PER_GROUP(sb))
> > +		return 0;
> > +	return 1;
> > +}
> > +
> >  /*
> >   * Read the bitmap for a given block_group,and validate the
> >   * bits for block/inode/inode tables are set in the bitmaps
> > @@ -129,6 +140,24 @@ read_block_bitmap(struct super_block *sb, unsigned int block_group)
> >  	desc = ext2_get_group_desc(sb, block_group, NULL);
> >  	if (!desc)
> >  		return NULL;
> > +	if (!ext2_block_in_group(sb, block_group,
> > +				le32_to_cpu(desc->bg_block_bitmap)) ||
> > +	    !ext2_block_in_group(sb, block_group,
> > +				le32_to_cpu(desc->bg_inode_bitmap)) ||
> > +	    !ext2_block_in_group(sb, block_group,
> > +				le32_to_cpu(desc->bg_inode_table)) ||
> > +	    !ext2_block_in_group(sb, block_group,
> > +				le32_to_cpu(desc->bg_inode_table) +
> > +				EXT2_SB(sb)->s_itb_per_group - 1)) {

Isn't equivalent checking done in ext2_check_descriptors()?  It would make
sense to abstract out the "check one group and return error" code and use
it in both places.

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

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