From: David Chinner <dgc@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Chris Mason <chris.mason@oracle.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"Theodore Ts'o" <tytso@mit.edu>,
stable@kernel.org
Subject: Re: [RFC][PATCH] block: Isolate the buffer cache in it's own mappings.
Date: Mon, 22 Oct 2007 10:15:15 +1000 [thread overview]
Message-ID: <20071022001515.GW995458@sgi.com> (raw)
In-Reply-To: <200710211424.46650.nickpiggin@yahoo.com.au>
On Sun, Oct 21, 2007 at 02:24:46PM +1000, Nick Piggin wrote:
> On Saturday 20 October 2007 07:27, Eric W. Biederman wrote:
> > Currently only
> > metadata is more or less in sync with the contents of /dev/hda1.
>
> It either is or it isn't, right? And it is, isn't it? (at least
> for the common filesystems).
It is not true for XFS - it's metadata is not in sync with /dev/<block>
at all as all the cached metadata is kept in a different address space
to the raw block device.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
WARNING: multiple messages have this Message-ID (diff)
From: David Chinner <dgc@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Chris Mason <chris.mason@oracle.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Theodore Ts'o <tytso@mit.edu>,
stable@kernel.org
Subject: Re: [RFC][PATCH] block: Isolate the buffer cache in it's own mappings.
Date: Mon, 22 Oct 2007 10:15:15 +1000 [thread overview]
Message-ID: <20071022001515.GW995458@sgi.com> (raw)
In-Reply-To: <200710211424.46650.nickpiggin@yahoo.com.au>
On Sun, Oct 21, 2007 at 02:24:46PM +1000, Nick Piggin wrote:
> On Saturday 20 October 2007 07:27, Eric W. Biederman wrote:
> > Currently only
> > metadata is more or less in sync with the contents of /dev/hda1.
>
> It either is or it isn't, right? And it is, isn't it? (at least
> for the common filesystems).
It is not true for XFS - it's metadata is not in sync with /dev/<block>
at all as all the cached metadata is kept in a different address space
to the raw block device.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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next prev parent reply other threads:[~2007-10-22 0:15 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-15 8:28 [PATCH resend] ramdisk: fix zeroed ramdisk pages on memory pressure Christian Borntraeger
2007-10-15 8:28 ` Christian Borntraeger
2007-10-15 14:06 ` Nick Piggin
2007-10-15 14:06 ` Nick Piggin
2007-10-15 9:05 ` Christian Borntraeger
2007-10-15 9:05 ` Christian Borntraeger
2007-10-15 14:38 ` Nick Piggin
2007-10-15 14:38 ` Nick Piggin
2007-10-15 18:38 ` Eric W. Biederman
2007-10-15 18:38 ` Eric W. Biederman
2007-10-15 22:37 ` Eric W. Biederman
2007-10-15 22:37 ` Eric W. Biederman
2007-10-15 22:40 ` [PATCH] rd: Preserve the dirty bit in init_page_buffers() Eric W. Biederman
2007-10-15 22:40 ` Eric W. Biederman
2007-10-15 22:42 ` [PATCH] rd: Mark ramdisk buffers heads dirty Eric W. Biederman
2007-10-15 22:42 ` Eric W. Biederman
2007-10-16 7:56 ` Christian Borntraeger
2007-10-16 7:56 ` Christian Borntraeger
2007-10-16 8:05 ` rubenjr_22
2007-10-16 8:13 ` rubenjr_22
2007-10-16 9:22 ` Eric W. Biederman
2007-10-16 9:22 ` Eric W. Biederman
2007-10-17 16:14 ` Christian Borntraeger
2007-10-17 16:14 ` Christian Borntraeger
2007-10-17 17:57 ` Eric W. Biederman
2007-10-17 17:57 ` Eric W. Biederman
2007-10-17 19:14 ` Chris Mason
2007-10-17 19:14 ` Chris Mason
2007-10-17 20:29 ` Eric W. Biederman
2007-10-17 20:29 ` Eric W. Biederman
2007-10-17 20:54 ` Chris Mason
2007-10-17 20:54 ` Chris Mason
2007-10-17 21:30 ` Eric W. Biederman
2007-10-17 21:30 ` Eric W. Biederman
2007-10-17 22:58 ` Chris Mason
2007-10-17 22:58 ` Chris Mason
2007-10-17 23:28 ` Eric W. Biederman
2007-10-17 23:28 ` Eric W. Biederman
2007-10-18 0:03 ` Chris Mason
2007-10-18 0:03 ` Chris Mason
2007-10-18 3:27 ` Eric W. Biederman
2007-10-18 3:27 ` Eric W. Biederman
2007-10-18 3:59 ` [RFC][PATCH] block: Isolate the buffer cache in it's own mappings Eric W. Biederman
2007-10-18 3:59 ` Eric W. Biederman
2007-10-18 4:32 ` Andrew Morton
2007-10-18 4:32 ` Andrew Morton
2007-10-19 21:27 ` Eric W. Biederman
2007-10-19 21:27 ` Eric W. Biederman
2007-10-21 4:24 ` Nick Piggin
2007-10-21 4:24 ` Nick Piggin
2007-10-21 4:53 ` Eric W. Biederman
2007-10-21 4:53 ` Eric W. Biederman
2007-10-21 5:36 ` Nick Piggin
2007-10-21 5:36 ` Nick Piggin
2007-10-21 7:09 ` Eric W. Biederman
2007-10-21 7:09 ` Eric W. Biederman
2007-10-22 0:15 ` David Chinner [this message]
2007-10-22 0:15 ` David Chinner
2007-10-18 5:10 ` Nick Piggin
2007-10-18 5:10 ` Nick Piggin
2007-10-19 21:35 ` Eric W. Biederman
2007-10-19 21:35 ` Eric W. Biederman
2007-10-17 21:48 ` [PATCH] rd: Mark ramdisk buffers heads dirty Christian Borntraeger
2007-10-17 21:48 ` Christian Borntraeger
2007-10-17 22:22 ` Eric W. Biederman
2007-10-17 22:22 ` Eric W. Biederman
2007-10-18 9:26 ` Christian Borntraeger
2007-10-18 9:26 ` Christian Borntraeger
2007-10-19 22:46 ` Eric W. Biederman
2007-10-19 22:46 ` Eric W. Biederman
2007-10-19 22:51 ` [PATCH] rd: Use a private inode for backing storage Eric W. Biederman
2007-10-19 22:51 ` Eric W. Biederman
2007-10-21 4:28 ` Nick Piggin
2007-10-21 4:28 ` Nick Piggin
2007-10-21 5:10 ` Eric W. Biederman
2007-10-21 5:10 ` Eric W. Biederman
2007-10-21 5:24 ` Nick Piggin
2007-10-21 5:24 ` Nick Piggin
2007-10-21 6:48 ` Eric W. Biederman
2007-10-21 6:48 ` Eric W. Biederman
2007-10-21 7:28 ` Christian Borntraeger
2007-10-21 7:28 ` Christian Borntraeger
2007-10-21 8:23 ` Eric W. Biederman
2007-10-21 8:23 ` Eric W. Biederman
2007-10-21 9:56 ` Nick Piggin
2007-10-21 9:56 ` Nick Piggin
2007-10-21 18:39 ` Eric W. Biederman
2007-10-21 18:39 ` Eric W. Biederman
2007-10-22 1:56 ` Nick Piggin
2007-10-22 1:56 ` Nick Piggin
2007-10-22 13:11 ` Chris Mason
2007-10-22 13:11 ` Chris Mason
2007-10-21 9:39 ` Nick Piggin
2007-10-21 9:39 ` Nick Piggin
2007-10-21 17:56 ` Eric W. Biederman
2007-10-21 17:56 ` Eric W. Biederman
2007-10-22 0:29 ` Nick Piggin
2007-10-22 0:29 ` Nick Piggin
2007-10-16 8:19 ` [PATCH] rd: Mark ramdisk buffers heads dirty Nick Piggin
2007-10-16 8:19 ` Nick Piggin
2007-10-16 8:48 ` Christian Borntraeger
2007-10-16 8:48 ` Christian Borntraeger
2007-10-16 19:06 ` Eric W. Biederman
2007-10-16 19:06 ` Eric W. Biederman
2007-10-16 22:06 ` Nick Piggin
2007-10-16 22:06 ` Nick Piggin
2007-10-16 8:12 ` [PATCH] rd: Preserve the dirty bit in init_page_buffers() Nick Piggin
2007-10-16 8:12 ` Nick Piggin
2007-10-16 9:35 ` Eric W. Biederman
2007-10-16 9:35 ` Eric W. Biederman
2007-10-15 9:16 ` [PATCH resend] ramdisk: fix zeroed ramdisk pages on memory pressure Andrew Morton
2007-10-15 9:16 ` Andrew Morton
2007-10-15 15:23 ` Nick Piggin
2007-10-15 15:23 ` Nick Piggin
2007-10-16 3:14 ` Eric W. Biederman
2007-10-16 3:14 ` Eric W. Biederman
2007-10-16 6:45 ` Nick Piggin
2007-10-16 6:45 ` Nick Piggin
2007-10-16 4:57 ` Eric W. Biederman
2007-10-16 4:57 ` Eric W. Biederman
2007-10-16 8:08 ` Nick Piggin
2007-10-16 8:08 ` Nick Piggin
2007-10-16 7:47 ` [patch][rfc] rewrite ramdisk Nick Piggin
2007-10-16 7:52 ` Jan Engelhardt
2007-10-16 7:52 ` Jan Engelhardt
2007-10-16 8:07 ` Nick Piggin
2007-10-16 8:07 ` Nick Piggin
2007-10-16 8:17 ` Jan Engelhardt
2007-10-16 8:17 ` Jan Engelhardt
2007-10-16 8:26 ` Nick Piggin
2007-10-16 8:26 ` Nick Piggin
2007-10-16 8:53 ` Jan Engelhardt
2007-10-16 8:53 ` Jan Engelhardt
2007-10-16 9:08 ` Eric W. Biederman
2007-10-16 9:08 ` Eric W. Biederman
2007-10-16 21:28 ` Theodore Tso
2007-10-16 21:28 ` Theodore Tso
2007-10-16 22:08 ` Nick Piggin
2007-10-16 22:08 ` Nick Piggin
2007-10-16 23:48 ` Eric W. Biederman
2007-10-16 23:48 ` Eric W. Biederman
2007-10-17 0:28 ` Nick Piggin
2007-10-17 0:28 ` Nick Piggin
2007-10-17 1:13 ` Eric W. Biederman
2007-10-17 1:13 ` Eric W. Biederman
2007-10-17 1:47 ` Nick Piggin
2007-10-17 1:47 ` Nick Piggin
2007-10-17 10:30 ` Eric W. Biederman
2007-10-17 10:30 ` Eric W. Biederman
2007-10-17 12:49 ` Nick Piggin
2007-10-17 12:49 ` Nick Piggin
2007-10-17 18:45 ` Eric W. Biederman
2007-10-17 18:45 ` Eric W. Biederman
2007-10-18 1:06 ` Nick Piggin
2007-10-18 1:06 ` Nick Piggin
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