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Date:      Mon, 20 Feb 2012 11:02:59 +0200
From:      Mikolaj Golub <trociny@freebsd.org>
To:        Konstantin Belousov <kostikbel@gmail.com>
Cc:        "Robert N. M. Watson" <rwatson@freebsd.org>, freebsd-arch@freebsd.org
Subject:   Re: unix domain sockets on nullfs(5)
Message-ID:  <8662f1q3lo.fsf@in138.ua3>
In-Reply-To: <20120219170151.GS3283@deviant.kiev.zoral.com.ua> (Konstantin Belousov's message of "Sun, 19 Feb 2012 19:01:51 %2B0200")
References:  <D1B8F00C-1E0D-4916-BD4B-FBCAE28E6F22@FreeBSD.org> <86fwfnti5t.fsf@kopusha.home.net> <CAOnPXZ_y5G6uEBWmfuH7qYBh%2B4Pw=O91ztCPEFCOTzWdCzx%2BRA@mail.gmail.com> <BBDE763A-F55E-453D-A503-2489C9040EF6@freebsd.org> <20120112215106.GC31224@deviant.kiev.zoral.com.ua> <86hazntwmu.fsf@kopusha.home.net> <20120123031238.GL31224@deviant.kiev.zoral.com.ua> <86zkcfu9ac.fsf@kopusha.home.net> <20120218215003.GM3283@deviant.kiev.zoral.com.ua> <86ehtrf8qf.fsf@kopusha.home.net> <20120219170151.GS3283@deviant.kiev.zoral.com.ua>

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On Sun, 19 Feb 2012 19:01:51 +0200 Konstantin Belousov wrote:

 KB> On Sun, Feb 19, 2012 at 11:55:20AM +0200, Mikolaj Golub wrote:
 >> 
 >> On Sat, 18 Feb 2012 23:50:03 +0200 Konstantin Belousov wrote:
 >> 
 >>  KB> On Sat, Feb 18, 2012 at 11:22:03PM +0200, Mikolaj Golub wrote:
 >>  >> After collecting all suggestions and additional testing I have got this patch
 >>  >> set:
 >>  >> 
 >>  >> http://people.freebsd.org/~trociny/unp_prepare_reclaim.1.patch
 >>  KB> Including unpcb.h into vfs_subr.c looks too extreme. Put the prototype
 >>  KB> into vnode.h, possibly renaming the function to vfs_unp_reclaim.
 >> 
 >> Done.
 >> 
 >>  >> http://people.freebsd.org/~trociny/unp_connect.LOCKSHARED.1.patch
 >>  >> http://people.freebsd.org/~trociny/VOP_UNP.3.patch
 >>  KB> I has a painting suggestion there, call the vops VOP_UNP_DETACH etc,
 >>  KB> otherwise it takes too much reading to understand that it is not undetach.
 >> 
 >> Unfortunately, vnode_if.awk does not support underscores in VOP names. It
 >> failed with "Invalid %% construction" due to the restriction: $2 !~ /^[a-z]+$/.
 >> So I reverted back to the old naming.
 KB> Ok, might be it makes sense to try to add underscore to the set of
 KB> allowed symbols.

It does not look difficult and the patch is trivial:

http://people.freebsd.org/~trociny/vnode_if.awk.patch

I built and booted the kernel with VOP_UNP_* using it.

I could commit if other people are ok with this and don't see issues.

 >> 
 >> The updated patches:
 >> 
 >> http://people.freebsd.org/~trociny/unp_prepare_reclaim.2.patch
 >> http://people.freebsd.org/~trociny/unp_connect.LOCKSHARED.1.patch
 >> http://people.freebsd.org/~trociny/VOP_UNP.4.patch

 KB> In the comment above vfs_unp_reclaim(), say "before socket-type vnode
 KB> reclamation".

 KB> I have no further comments.

Thanks.

-- 
Mikolaj Golub



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