From: Matt Mackall <mpm@selenic.com>
To: Thomas Tuttle <ttuttle@google.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] pagemap: Make pagemap_read enforce reading in multiples of 8
Date: Thu, 05 Jun 2008 11:21:25 -0500 [thread overview]
Message-ID: <1212682885.3953.183.camel@calx> (raw)
In-Reply-To: <4ca0a85e0806050914v5dc78fbcv373b08f09e37a337@mail.gmail.com>
On Thu, 2008-06-05 at 12:14 -0400, Thomas Tuttle wrote:
> On Thu, Jun 5, 2008 at 12:09 PM, Matt Mackall <mpm@selenic.com> wrote:
> > Yes, I got that, I'm just mathematically impaired this morning. Read
> > that as "when someone tries to do a *20* byte read, do a 16-byte read.."
> > In other words, round down to the nearest multiple of 8.
>
> Oh. I would seriously question doing that, because it would allow
> reads that are improperly split up to fail silently. What happens if
> someone tries to read 40 bytes, and (for some reason) it gets split
> into two 20-byte reads? Instead of "12345" they'll get "12.34."
> (where . is 4 zero or garbage bytes). I'd rather they get an error.
I suppose you're right, people usually don't check those return codes.
--
Mathematics is the supreme nostalgia of our time.
prev parent reply other threads:[~2008-06-05 16:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-05 15:06 [PATCH 3/5] pagemap: Make pagemap_read enforce reading in multiples of 8 Thomas Tuttle
2008-06-05 16:03 ` Matt Mackall
2008-06-05 16:05 ` Thomas Tuttle
2008-06-05 16:09 ` Matt Mackall
2008-06-05 16:14 ` Thomas Tuttle
2008-06-05 16:21 ` Matt Mackall [this message]
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