From: Andrew Morton <akpm@osdl.org>
To: Andy Isaacson <adi@hexapodia.org>
Cc: bug-coreutils@gnu.org, linux-kernel@vger.kernel.org
Subject: Re: dd PATCH: add conv=direct
Date: Tue, 6 Apr 2004 17:33:26 -0700 [thread overview]
Message-ID: <20040406173326.0fbb9d7a.akpm@osdl.org> (raw)
In-Reply-To: <20040406220358.GE4828@hexapodia.org>
Andy Isaacson <adi@hexapodia.org> wrote:
>
> On modern Linux, apparently the correct way to bypass the buffer cache
> when writing to a block device is to open the block device with
> O_DIRECT. This enables, for example, the user to more easily force a
> reallocation of a single sector of an IDE disk with a media error
> (without overwriting anything but the 1k "sector pair" containing the
> error). dd(1) is convenient for this purpose, but is lacking a method
> to force O_DIRECT. The enclosed patch adds a "conv=direct" flag to
> enable this usage.
This would be rather nice to have. You'll need to ensure that the data
is page-aligned in memory.
While you're there, please add an fsync-before-closing option.
next prev parent reply other threads:[~2004-04-07 0:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-06 22:03 dd PATCH: add conv=direct Andy Isaacson
2004-04-07 0:33 ` Andrew Morton [this message]
2004-04-07 16:21 ` Bruce Allen
2004-04-07 16:42 ` Andrew Morton
2004-04-07 17:31 ` Andy Isaacson
2004-04-07 18:18 ` Andrew Morton
2004-04-07 19:24 ` Andy Isaacson
2004-04-07 19:34 ` Andrew Morton
2004-04-07 19:47 ` Andy Isaacson
2004-04-07 20:03 ` Andrew Morton
2004-04-07 20:43 ` Andy Isaacson
2004-04-07 21:00 ` Valdis.Kletnieks
2004-04-07 21:35 ` Bruce Allen
2004-04-08 6:56 ` Paul Eggert
2004-04-08 11:07 ` Jim Meyering
2004-04-08 19:32 ` Paul Eggert
2004-04-08 19:51 ` Paul Jarc
2004-04-08 21:34 ` Jim Meyering
2004-04-08 16:23 ` Philippe Troin
2004-04-08 20:20 ` dd patch to remove noctty Paul Eggert
2004-04-08 21:40 ` Jim Meyering
2004-04-09 0:37 ` dd PATCH: add conv=direct Anton Blanchard
2004-04-09 1:42 ` Wim Coekaerts
2004-04-10 21:28 ` Jim Meyering
2004-04-07 20:46 ` Paul Eggert
2004-04-07 21:06 ` Andrew Morton
2004-04-07 21:09 ` Andy Isaacson
2004-04-07 19:12 ` Miquel van Smoorenburg
2004-04-07 20:14 ` Andy Isaacson
2004-04-07 22:02 ` Nathan Straz
2004-04-07 22:09 ` Andy Isaacson
2004-04-08 11:44 ` Miquel van Smoorenburg
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