On Nov 15, 2001 00:34 -0500, William Park wrote:
> Judging by 'driver/block/nbd.c', it counts by BLOCK_SIZE=1204
> (BLOCK_SIZE_BITS=10), even though you can set the block size to
> [512,1024,...,PAGE_SIZE=4096]. Since NBD counts this 1KB block using
> 'u64' integer, the ultimate size of filesystem is determined by the
> kernel block device support.
>
> Looking at 'fs/block_dev.c', you can set the block size to
> [512,1024,...,PAGE_SIZE=4096] also. But, 'max_block()' returns block
> count in whatever block size of the device, not in BLOCK_SIZE:
Sadly, while you _might_ be able to change the BLOCK_SIZE to be something
other than 1kB, there are probably so many places that assume a 1kB size
that you will need a lot of fixing. I'm not saying that fixing these
things is bad (it would actually be good for many reasons), but just a
heads-up that changing the BLOCK_SIZE define _probably_ won't get you 8TB
devices (maybe a broken system, or corrupt fs instead). Use caution.
Cheers, Andreas
-- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Nov 15 2001 - 21:00:41 EST