From: William Lee Irwin III <wli@holomorphy.com>
To: linux-kernel@vger.kernel.org
Cc: viro@math.psu.edu
Subject: Re: [RFC] 2.4 truncate locking
Date: Thu, 18 Apr 2002 21:37:29 -0700 [thread overview]
Message-ID: <20020419043729.GZ21206@holomorphy.com> (raw)
In-Reply-To: <20020417150912.GI23767@holomorphy.com>
On Wed, Apr 17, 2002 at 08:09:12AM -0700, William Lee Irwin III wrote:
> I did some research on how truncate_inode_pages()'s locking works.
> Please feel free to clarify and/or correct my notes on the subject,
> which I'd like to turn into a docpatch soon.
>
> (9) exclusion from simultaneous manipulation of page->mapping
> pagemap_lru_lock
This is incorrect. It appears to be a combination of PG_locked and
pagecache_lock, where both are required for writing, and only one of
the two for reading.
Cheers,
Bill
prev parent reply other threads:[~2002-04-19 4:38 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-17 15:09 [RFC] 2.4 truncate locking William Lee Irwin III
2002-04-19 4:37 ` William Lee Irwin III [this message]
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