Date: Wed, 20 Apr 2005 19:38:59 +0200 From: Marc Olzheim <marcolz@stack.nl> To: freebsd-standards@freebsd.org Cc: Garrett Wollman <wollman@csail.mit.edu> Subject: Re: NFS client/buffer cache deadlock Message-ID: <20050420173859.GA99695@stack.nl> In-Reply-To: <16998.36437.809896.936800@khavrinen.csail.mit.edu> 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> <16998.36437.809896.936800@khavrinen.csail.mit.edu>
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--ibTvN161/egqYuK8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 20, 2005 at 01:16:05PM -0400, Garrett Wollman wrote: > <<On Wed, 20 Apr 2005 16:38:42 +0200, Marc Olzheim <marcolz@stack.nl> sai= d: >=20 > > Btw.: I'm not sure write(),writev() and pwrite() are allowed to do short > > writes on regular files... ? >=20 > I believe it is the intent of the Standard to prohibit this (a > paragraph in the rationale says that short writes can only happen if > O_NONBLOCK is set, but this is clearly wrong because the normative > text says end-of-medium also results in a short write) but there does > not appear to be any language which requires atomic behavior for > descriptors other than pipes and FIFOs. >=20 > As a quality-of-implementation matter, for writes to regular files not > to be atomic would be considered surprising. >=20 > -GAWollman Could someone from standards comment here ? I believe Garrett is right... (thread is on -hackers and -current) Marc --ibTvN161/egqYuK8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCZpOzezjnobFOgrERAnLDAJ9Vaq4bpJkVoUOC/npsG07DllHd2gCgwDmn 8mEJcwidDAFtEadBZvuiPWQ= =sN7A -----END PGP SIGNATURE----- --ibTvN161/egqYuK8--
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