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Date:      Fri, 22 Apr 2005 11:28:15 -0400
From:      Garrett Wollman <wollman@csail.mit.edu>
To:        Brian Fundakowski Feldman <green@FreeBSD.ORG>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: NFS client/buffer cache deadlock
Message-ID:  <17001.6159.521697.442481@khavrinen.csail.mit.edu>
In-Reply-To: <20050422150835.GM1157@green.homeunix.org>
References:  <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> <20050420153528.GC77731@stack.nl> <20050420155233.GJ1157@green.homeunix.org> <16998.37222.529748.205885@khavrinen.csail.mit.edu> <20050422150835.GM1157@green.homeunix.org>

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<<On Fri, 22 Apr 2005 11:08:35 -0400, Brian Fundakowski Feldman <green@FreeBSD.ORG> said:


> Can you find any evidence that it's acceptable to interleave multiple
> writers that are doing O_APPEND?  At best, to do what you're asking,
> they could be kept from being interleaved from the context of one
> specific NFS client host...

As far as POSIX goes, the standard says that applications are expected
to handle serialization.  It makes no exception for O_APPEND.

-GAWollman



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