Date: Fri, 21 Dec 2001 16:44:29 -0600 From: Alfred Perlstein <bright@mu.org> To: rsharpe@ns.aus.com Cc: FreeBSD-hackers@freebsd.org Subject: Re: Adding si_fd to struct __siginfo ... Message-ID: <20011221164429.U48837@elvis.mu.org> In-Reply-To: <3C23AF6E.90202@ns.aus.com>; from sharpe@ns.aus.com on Sat, Dec 22, 2001 at 08:23:50AM %2B1030 References: <3C23AF6E.90202@ns.aus.com>
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* Richard Sharpe <sharpe@ns.aus.com> [011221 15:11] wrote: > Hi, > > One of my tasks is to add oplock support to FreeBSD so that we (Panasas) > can allow correct caching of files by Windows clients in the presence of > NFS clients using the same files. > > We have a preliminary implementation, based on the Linux implementation, > but it is a gross hack because there is no way for the kernel, when it > delivers a signal, to indicate the fd that caused delivery of the signal. > > Linux and Solaris have an fd field in struct siginfo_t which allows the > kernel to indicate, for signals relating to files, to indicate which fd > the signal relates to. > > I notice that in FreeBSD struct siginfo_t seems to have int > __spare__[7]; and would like to use one of those spare fields as si_fd. > > While I can do that in our code base, if I want to contribute the OpLock > code it would be useful if the FreeBSD community finds this change > agreeable. > > Are there any counter suggestions or any big objections? There was already a big mess of a discussion about how this would be much better done via kqueue than with realtime signals. I guess if you can get a working implementation that is compatible with the existing interfaces it would work, however it's a _much_ better idea to use kqueue to deliver this sort of notification. And yes, it has been discussed in the lists already. -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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