From: Roland Dreier <roland@topspin.com>
To: Kevin Corry <kevcorry@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, Benjamin LaHaise <bcrl@kvack.org>,
Alasdair G Kergon <agk@redhat.com>, Andrew Morton <akpm@osdl.org>
Subject: Re: device-mapper: fix TB stripe data corruption
Date: Fri, 21 Jan 2005 13:20:31 -0800 [thread overview]
Message-ID: <52651qqy1s.fsf@topspin.com> (raw)
In-Reply-To: <200501211512.45524.kevcorry@us.ibm.com> (Kevin Corry's message of "Fri, 21 Jan 2005 15:12:45 -0600")
Kevin> We have to take a mod of the chunk value and the number of
Kevin> stripes (which can be a non-power-of-2, so a shift won't
Kevin> work). It's been my understanding that you couldn't mod a
Kevin> 64-bit value with a 32-bit value in the kernel.
If I understand you correctly, do_div() (defined in <asm/div64.h>)
does what you need. Look at asm-generic/div64.h for a good
description of the precise semantics of do_div().
- Roland
next prev parent reply other threads:[~2005-01-21 21:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-21 18:12 device-mapper: fix TB stripe data corruption Alasdair G Kergon
2005-01-21 20:33 ` Benjamin LaHaise
2005-01-21 21:12 ` Kevin Corry
2005-01-21 21:20 ` Roland Dreier [this message]
2005-01-21 21:57 ` Kevin Corry
2005-01-22 22:35 ` Alasdair G Kergon
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