From: Pavel Machek <pavel@ucw.cz>
To: Soren Hansen <soren@linux2go.dk>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
linux-kernel@vger.kernel.org, Dave Hansen <haveblue@us.ibm.com>
Subject: Re: nbd locking problems
Date: Sun, 13 Mar 2011 11:28:26 +0100 [thread overview]
Message-ID: <20110313102756.GD1827@ucw.cz> (raw)
In-Reply-To: <AANLkTi=1ubso_qg1dr+xOaF4s=f0Jfzchinh3dnY7jjY@mail.gmail.com>
Hi!
> > In the meantime, could you please post your patch? (Is it the
> > three-liner I'd expect?)
>
> Indeed it is. I was holding off on posting it, because I was hoping
> Pavel Machek would chime in. Pavel's commit message in [1] suggested
> that there was more work to do before the BKL could be vanquished from
> this driver (by changing .ioctl to .unlocked_ioctl).
Well, I tried to figure out locking in nbd, but could not. It somehow
wants both transmit and receive protected... but at the same time it
needs receiving while it transmits. Not sure what to do there.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2011-03-13 10:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-26 10:52 nbd locking problems Soren Hansen
2011-01-28 21:18 ` Serge E. Hallyn
2011-01-28 21:30 ` Arnd Bergmann
2011-01-28 23:11 ` Soren Hansen
2011-03-13 10:28 ` Pavel Machek [this message]
2011-01-31 19:35 ` Serge E. Hallyn
2011-01-28 23:23 ` [PATCH] nbd: Remove module-level ioctl mutex Soren Hansen
2011-01-30 15:07 nbd locking problems Paul Clements
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