Date: Sat, 27 Aug 2011 10:59:03 +0100 From: "Robert N. M. Watson" <rwatson@freebsd.org> To: Benjamin Kaduk <kaduk@MIT.EDU> Cc: freebsd-arch@freebsd.org Subject: Re: Removing Giant from VFS in 10.0 (was: Re: skipping locks, mutex_owned, usb) Message-ID: <DBD3B7B0-0172-4941-956F-BF210810A6A4@freebsd.org> In-Reply-To: <alpine.GSO.1.10.1108262140240.1411@multics.mit.edu> References: <4E53986B.5000804@FreeBSD.org> <201108230911.09021.jhb@freebsd.org> <4E564F15.3010809@FreeBSD.org> <201108250945.24606.jhb@freebsd.org> <4e576127.Suqlhieb0FMDx8cB%perryh@pluto.rain.com> <alpine.BSF.2.00.1108261007110.48200@fledge.watson.org> <alpine.GSO.1.10.1108262140240.1411@multics.mit.edu>
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On 27 Aug 2011, at 02:43, Benjamin Kaduk wrote: > On Fri, 26 Aug 2011, Robert Watson wrote: >=20 >> We also need to start announcing this early in the 10.0 cycle so that = third-party file system developers for FreeBSD -- especially anyone = interested in things like OpenAFS and Fuse, can do appropriate updates = there as well. >=20 > For what it's worth, OpenAFS already passes MNTK_MPSAFE /* solid steel = */, with what I expect is nearly-correct locking. Excellent! (Although I guess OpenAFS internally has the moral equivalent of a Giant = lock that protects its own structures, but that's an entirely = independent problem that the OpenAFS community is already interested = in?) Robert=
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