e2fsck: make block counting variable in pass1 64 bits

Justin reported that creating a 4T file with posix_fallocate led
to fsck errors:

e2fsck 1.41.10 (10-Feb-2009)
Pass 1: Checking inodes, blocks, and sizes
Inode 12, i_blocks is 8589935432, should be 840.  Fix? yes

This looks like a 32-bit overflow.

commmit 8a8f36540bbf5d4397cf476e216e9a720b5c1d8e added handling of
the high i_blocks number, but we accumulate blocks in the num_blocks
field, and that's still just 32 bits.

Note: we don't need to expand max_blocks for now, that's only used
in the non-extents case, and those files have smaller max sizes.

I haven't been able to replicate the problem, oddly, but Justin
reports that this patch fixed his situation.

Reported-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

(resend, a thunderbird upgrade changed things so vger was eating my patches)



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Applied to the maint branch

				- Ted

On Tue, Mar 30, 2010 at 11:42:51AM -0500, Eric Sandeen wrote:
> Justin reported that creating a 4T file with posix_fallocate led
> to fsck errors:
> 
> e2fsck 1.41.10 (10-Feb-2009)
> Pass 1: Checking inodes, blocks, and sizes
> Inode 12, i_blocks is 8589935432, should be 840.  Fix? yes
> 
> This looks like a 32-bit overflow.
> 
> commmit 8a8f36540bbf5d4397cf476e216e9a720b5c1d8e added handling of
> the high i_blocks number, but we accumulate blocks in the num_blocks
> field, and that's still just 32 bits.
> 
> Note: we don't need to expand max_blocks for now, that's only used
> in the non-extents case, and those files have smaller max sizes.
> 
> I haven't been able to replicate the problem, oddly, but Justin
> reports that this patch fixed his situation.
> 
> Reported-by: Justin Maggard <jmaggard10@gmail.com>
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> (resend, a thunderbird upgrade changed things so vger was eating my patches)
> 
> 
> diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
> index 09ff1d0..8c8fe8c 100644
> --- a/e2fsck/pass1.c
> +++ b/e2fsck/pass1.c
> @@ -80,7 +80,7 @@ struct process_block_struct {
>  	ext2_ino_t	ino;
>  	unsigned	is_dir:1, is_reg:1, clear:1, suppress:1,
>  				fragmented:1, compressed:1, bbcheck:1;
> -	blk_t		num_blocks;
> +	blk64_t		num_blocks;
>  	blk_t		max_blocks;
>  	e2_blkcnt_t	last_block;
>  	int		num_illegal_blocks;
> 
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