linux-ext4 - Re: [PATCH 2/2] ext4: introduce ext4_get_group

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Message-ID: <20130327034422.GF5861@thunk.org>
Date:	Tue, 26 Mar 2013 23:44:22 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] ext4: introduce ext4_get_group_number()

On Tue, Mar 26, 2013 at 11:12:07PM -0400, Theodore Ts'o wrote:
> Again, we have the same problem as the previous patch.  I could
> imagine setting a flag which uses the shift-instead-of-div
> optimization, but that will reduce the optimization somewhat.  

Just to be clear, I was thinking that at mount time we could check to
see whether the number of blocks per group == blocksize * 8, and if
so, then set a per-filesystem flag in the sbi structure which we could
then use to optionally use the shift-right optimization.

						- Ted
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