Date: Wed, 20 Apr 2005 17:35:28 +0200 From: Marc Olzheim <marcolz@stack.nl> To: Brian Fundakowski Feldman <green@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: NFS client/buffer cache deadlock Message-ID: <20050420153528.GC77731@stack.nl> In-Reply-To: <20050420152038.GI1157@green.homeunix.org> References: <20050419133227.GA11612@stack.nl> <20050419151800.GE1157@green.homeunix.org> <20050419160258.GA12287@stack.nl> <20050419160900.GB12287@stack.nl> <20050419161616.GF1157@green.homeunix.org> <20050419204723.GG1157@green.homeunix.org> <20050420140409.GA77731@stack.nl> <20050420142448.GH1157@green.homeunix.org> <20050420143842.GB77731@stack.nl> <20050420152038.GI1157@green.homeunix.org>
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--iFRdW5/EC4oqxDHL Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 20, 2005 at 11:20:38AM -0400, Brian Fundakowski Feldman wrote: > Reads should be totally unaffected... The server was misbehaving. Fixed. :-) > > Btw.: I'm not sure write(),writev() and pwrite() are allowed to do short > > writes on regular files... ? >=20 > Our manpage is incorrect; POSIX states that they are (see earlier > e-mail). There really is no alternative -- we simply can't build > an NFS transaction larger than our buffer cache can accomodate. > Note that short wries won't happen for normal buffer sizes, only > excessively large ones. I really don't believe that writev() is meant > to be used so that you can write gigantic data structures in a single > transaction... Ah, I was reading the SUSv2 page: http://www.opengroup.org/onlinepubs/009695399/functions/write.html instead of the POSIX version. But in neither of those I can extrude the fact that it can return with result < nbyte, without it being a permanent condition. What phrase makes you conclude that it can ? Marc --iFRdW5/EC4oqxDHL Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCZnbAezjnobFOgrERAqYEAJ9a25uCceVtDReKpiAUkMsNi0h5fACeJvTc dpl7Dp6Sa4k3Bth3VKt/hR0= =qmxF -----END PGP SIGNATURE----- --iFRdW5/EC4oqxDHL--
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