linux-ext4 - Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

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Message-ID: <20080716145429.GA2167@mit.edu>
Date:	Wed, 16 Jul 2008 10:54:29 -0400
From:	Theodore Tso <tytso@....edu>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Goswin von Brederlow <goswin-v-b@....de>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup

On Wed, Jul 16, 2008 at 09:09:31AM -0500, Jose R. Santos wrote:
> No, ext2fs_get_device_size2() should return EFBIG size if the device is
> larger than 48-bit.  I need to fix that on ext2fs_get_device_size2() but 
> this check here is ok.

No, please don't do that.  Make it reuturn EFBIG if the device won't
fit in a blk64_t type (i.e., larger than 64-bits).  In mke2fs, there
should be a separate check to make sure the size is no larger than
48-bits.  Otherwise, at some future point, perhaps we might enhance
ext4 to support full a 64-bit physical block number, and then we would
have to make behavioural changes to ext2fs_get_device_size2() that
would necessitate renaming the function yet again.

It's really important when doing library design to think about future
expandability.

						- Ted
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