Date: Thu, 13 Nov 2003 13:39:17 -0500 From: "Brian F. Feldman" <green@FreeBSD.org> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: Kirk McKusick <mckusick@beastie.mckusick.com> Subject: Re: cvs commit: src/bin/df df.c src/sys/kern syscalls.master vfs_bio.c vfs_cluster.c vfs_syscalls.c src/sys/sys mount.h src/sys/ufs/ffs ffs_vfsops.c Message-ID: <200311131839.hADIdHZY012652@green.bikeshed.org> In-Reply-To: Message from "Poul-Henning Kamp" <phk@phk.freebsd.dk> of "Wed, 12 Nov 2003 23:52:23 %2B0100." <688.1068677543@critter.freebsd.dk>
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"Poul-Henning Kamp" <phk@phk.freebsd.dk> wrote: > In message <200311122219.hACMJwaG007327@beastie.mckusick.com>, Kirk McKusick wr > ites: > > From: "Brian F. Feldman" <green@FreeBSD.org> > > Date: Wed, 12 Nov 2003 14:16:07 -0500 > > Sender: owner-src-committers@FreeBSD.org > > X-Loop: FreeBSD.ORG > > > > Does this mean someone may be free to write wrappers that block > > ENOSYS, execute statfs calls, and fall back to ostatfs calls > > (translating 64->32 bit values as best as possible, like the kernel > > does) returning the new statfs? Obviously, this would just be to > > add a safety window for the transition period and to be removed > > before a -RELEASE. > > > > -- > > Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ > > <> green@FreeBSD.org \ The Power to Serve! \ > > Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\ > > > >The above would certainly be possible. If this were a more heavily > >used interface (like say stat), it would be a useful exercise. But > >I do not feel it is really necessary for statfs. However, I am not > >going to object if someone wants to go through the exercise of > >implementing your suggestion. > > Uhm, as far as I recall, calling an undefined system call gives you > a signal you need to handle, before you will ever see the ENOSYS. See, by "block ENOSYS", I sorta meant to say "block SIGSYS"... Still this seems like it would be a useful enough upgrade path for -current users if implemented soon. -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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