linux-kernel - Re: [PATCH 04/10] AXFS: axfs

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Message-ID: <6934efce0808210806r701f2e3bo677d2bd2da78faec@mail.gmail.com>
Date:	Thu, 21 Aug 2008 08:06:50 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	"Arnd Bergmann" <arnd@...db.de>
Cc:	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	"Jörn Engel" <joern@...fs.org>,
	tim.bird@...sony.com, cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 04/10] AXFS: axfs_inode.c

> Have you seen any benefit of the rwsem over a simple mutex? I would guess
> that you can never even get into the situation where you get concurrent
> readers since I haven't found a single down_read() in your code, only
> downgrade_write()

We implemented a rwsem here because you can get concurrent readers.
My understanding is that downgrade_write() puts the rewem into the
same state as down_read().  Am I mistaken?
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