linux-ext4 - Re: [PATCH -V2 4/5] ext4: Use both hi and lo bits of the group desc values.

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Date:	Fri, 21 Nov 2008 11:53:29 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	Coly Li <coyli@...e.de>, cmm@...ibm.com, tytso@....edu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH -V2 4/5] ext4: Use both hi and lo bits of the group	desc
 values.

Aneesh Kumar K.V wrote:
> On Fri, Nov 21, 2008 at 11:29:49AM -0600, Eric Sandeen wrote:
>> Aneesh Kumar K.V wrote:
>>> Rename the lower bits with suffix _lo and add helper
>>> to access the values. Also rename bg_itable_unused_hi
>>> to bg_pad as in e2fsprogs. bg_itable_unused_hi is never
>>> used before
>> Maybe you can add info about under which circumstances (what sort of
>> fielsystem geometry) the hi bits are needed?  And the failure mode when
>> we don't use them, if that's known?
> 
> Coly actually said it was added for inode reservation. But he agreed to
> drop the high bits now and add them later once the performance issue
> with the patch is addressed.
> 
> -aneesh

Ok, and for the rest?  (free_blocks, free_inodes) - I guess these are
only needed for > 2^32 block filesystems?

Thanks,
-eric
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