Date: Mon, 1 Mar 2010 17:22:27 -0500 From: John Baldwin <jhb@freebsd.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r204475 - head/sys/fs/msdosfs Message-ID: <201003011722.27155.jhb@freebsd.org> In-Reply-To: <20100301221213.GY2489@deviant.kiev.zoral.com.ua> References: <201002281719.o1SHJM6u042302@svn.freebsd.org> <201003011030.51154.jhb@freebsd.org> <20100301221213.GY2489@deviant.kiev.zoral.com.ua>
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On Monday 01 March 2010 5:12:13 pm Kostik Belousov wrote: > On Mon, Mar 01, 2010 at 10:30:51AM -0500, John Baldwin wrote: > > On Sunday 28 February 2010 12:19:22 pm Konstantin Belousov wrote: > > > Author: kib > > > Date: Sun Feb 28 17:19:22 2010 > > > New Revision: 204475 > > > URL: http://svn.freebsd.org/changeset/base/204475 > > > > > > Log: > > > Mark msdosfs as mpsafe. > > > > Are you planning on implementing support for LOOKUP_SHARED and > > EXTENDED_SHARED as well? > > Do you think it makes sense to do this for msdosfs ? > Please note that current msdosfs code exclusively uses exclusive locks > on the vnodes. > > One obvious issue with *_SHARED is the fat cache in the denode. Oh, hmm. I guess we would need to first allow it to use shared locks generically (VN_LOCK_ASHARE() for VOP_READ() and the like). I do think we should try to make our filesystems concurrent when it is not too terribly difficult. -- John Baldwin
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