From: Nick Piggin <nickpiggin@yahoo.com.au>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] Preserve the dirty bit in init_page_buffers
Date: Tue, 29 May 2007 15:14:42 +1000 [thread overview]
Message-ID: <465BB6C2.7050704@yahoo.com.au> (raw)
In-Reply-To: <m1veed82mz.fsf@ebiederm.dsl.xmission.com>
Eric W. Biederman wrote:
> Nick Piggin <nickpiggin@yahoo.com.au> writes:
>> However we
>>could still set_page_dirty of a block device page without buffers
>>via an mmap.
>
>
> After the page is made dirty via mmap we have:
> sys_write -> ... -> block_prepare_write -> ... -> create_empty_buffers.
Yep, that's what I mean.
> I suspect that is a pretty rare case but it does indeed seem to exist
> as a problem.
I think so too. But either we have some misunderstanding of the
codepaths involved, or the author of the comments there didn't
consider this case, so...
--
SUSE Labs, Novell Inc.
next prev parent reply other threads:[~2007-05-29 5:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-22 2:31 [PATCH 1/3] Preserve the dirty bit in init_page_buffers Eric W. Biederman
2007-05-22 2:36 ` [PATCH 2/3] rd: Mark ramdisk buffer heads dirty in ramdisk_set_page_dirty Eric W. Biederman
2007-05-22 2:40 ` [PATCH 3/3] rd: Simplify by using the same helper functions in libfs Eric W. Biederman
2007-05-28 4:09 ` [PATCH 1/3] Preserve the dirty bit in init_page_buffers Nick Piggin
2007-05-28 4:30 ` Eric W. Biederman
2007-05-28 4:54 ` Nick Piggin
2007-05-28 4:59 ` Nick Piggin
2007-05-28 14:05 ` Eric W. Biederman
2007-05-29 5:14 ` Nick Piggin [this message]
2007-05-29 5:28 ` Eric W. Biederman
2007-05-31 11:56 ` Eric W. Biederman
2007-05-31 15:55 ` Andrew Morton
2007-05-31 16:40 ` [PATCH] rd: Remove ramdisk_set_page_dirty Eric W. Biederman
2007-05-31 16:43 ` [PATCH] buffer: Kill old incorrect? comment Eric W. Biederman
2007-05-28 13:52 ` [PATCH 1/3] Preserve the dirty bit in init_page_buffers Eric W. Biederman
2007-05-28 6:37 ` Nick Piggin
2007-05-28 13:58 ` Eric W. Biederman
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