Date: Mon, 26 Feb 2001 14:02:09 -0800 (PST) From: Marc W <mwlist@lanfear.com> To: <owner-freebsd-hackers@FreeBSD.ORG>, Marc W <mwlist@lanfear.com> Cc: <nate@yogotech.com>, Drew Eckhardt <drew@PoohSticks.ORG>, freebsd-hackers@FreeBSD.ORG Subject: Re: Is mkdir guaranteed to be 'atomic' ?? Message-ID: <200102262202.OAA39275@akira.lanfear.com>
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> >
> > I can handle it if there is a case where both fail, but is
there a
> > case where both can SUCCEED ??
>
> What do you mean 'both succeed'?
My understanding is that, on non-broken filesystems, calls to
mkdir(2) either succeed by creating a new directory, or fail and return
EEXIST (note: excluding all other types of errors :-))
However, NFS seems to have issues, so the question is: could both
mkdir(2) calls actually succeed and claim to have created the same
directory (even if it is?), or is one ALWAYS guaranteed to fail, as on
a normal fs.
marc.
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