From: Andrew Morton <akpm@osdl.org>
To: Anton Altaparmakov <aia21@cam.ac.uk>
Cc: nathans@sgi.com, viro@parcelfarce.linux.theplanet.co.uk,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages.
Date: Wed, 2 Feb 2005 14:34:22 -0800 [thread overview]
Message-ID: <20050202143422.41c29202.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.60.0502021354540.16084@hermes-1.csi.cam.ac.uk>
Anton Altaparmakov <aia21@cam.ac.uk> wrote:
>
> Below is a patch which adds a function
> mm/filemap.c::find_or_create_pages(), locks a range of pages. Please see
> the function description in the patch for details.
This isn't very nice, is it, really? Kind of a square peg in a round hole.
If you took the approach of defining a custom file_operations.write() then
I'd imagine that the write() side of things would fall out fairly neatly:
no need for s_umount and i_sem needs to be taken anyway. No trylocking.
And for the vmscan->writepage() side of things I wonder if it would be
possible to overload the mapping's ->nopage handler. If the target page
lies in a hole, go off and allocate all the necessary pagecache pages, zero
them, mark them dirty?
next prev parent reply other threads:[~2005-02-02 22:34 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-02 15:12 RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages Anton Altaparmakov
2005-02-02 15:43 ` Matthew Wilcox
2005-02-02 15:56 ` Anton Altaparmakov
2005-02-02 22:34 ` Andrew Morton [this message]
2005-02-03 10:37 ` Anton Altaparmakov
2005-02-03 10:47 ` Andrew Morton
2005-02-03 11:23 ` Anton Altaparmakov
2005-02-03 19:23 ` RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages - nopage alternative Bryan Henderson
2005-02-04 15:36 ` Anton Altaparmakov
2005-02-04 17:17 ` Hugh Dickins
2005-02-04 23:09 ` Bryan Henderson
2005-02-03 19:03 ` RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages - loop device Bryan Henderson
2005-02-06 19:42 ` RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages Anton Altaparmakov
2005-02-06 20:42 ` Andrew Morton
2005-02-16 21:56 ` Anton Altaparmakov
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