On Fri, 2006-08-11 at 17:13 -0500, Eric Sandeen wrote:
> I figure before we get too fired up about 48 bits and ext4 let's fix 32 bits on ext3 :)
>
> I need to do some actual IO testing now, but this gets things mounting for a 16T ext3 filesystem.
> (patched up e2fsprogs is needed too, I'll send that off the kernel list)
>
> This patch fixes these issues in the kernel:
>
> o sbi->s_groups_count overflows in ext3_fill_super()
>
> sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
> le32_to_cpu(es->s_first_data_block) +
> EXT3_BLOCKS_PER_GROUP(sb) - 1) /
> EXT3_BLOCKS_PER_GROUP(sb);
>
> at 16T, s_blocks_count is already maxed out; adding EXT3_BLOCKS_PER_GROUP(sb) overflows it and
> groups_count comes out to 0. Not really what we want, and causes a failed mount.
>
> Feel free to check my math (actually, please do!), but changing it this way should work &
> avoid the overflow:
>
> (A + B - 1)/B changed to: ((A - 1)/B) + 1
>
> o ext3_check_descriptors() overflows range checks
Looks correct to me.:)
Mingming
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