linux-ext4 - Re: should ext2fs_get_device_size() be returning EFBIG for >8T (or 16T?)

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Message-ID: <471E41E8.2020306@redhat.com>
Date:	Tue, 23 Oct 2007 13:48:08 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: should ext2fs_get_device_size() be returning EFBIG for >8T (or
 16T?)

Eric Sandeen wrote:
> I have a bug saying hey, I can't grow my filesystem on a 16T device, and
> it's because really we can only go to (2^32)-1 blocks, not (2^32)...
> 
> I was going to just silently round down by a block, because for example
> LVM makes it *very* easy to make exactly 16T devices; dropping a block
> at mkfs/growfs time seems reasonable to me.
> 
> So that led me to ext2fs_get_device_size, and I see it actually has the
> maximum allowable filesystem size encoded in it, and you get EFBIG if
> it's bigger.

Actually I guess it's looking at the largest number a blk_t can hold,
but I think the same principle applies.  Maybe it's not a big deal today...

-Eric
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