On Wed, 2008-01-02 at 10:55 +0100, Michael Kerrisk wrote:
> Hey Trond,
>
> Would you take a quick look at
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=453946
>
> Do you have some insights on this? What should the man page say about
> current support of O_EXCL on NFS?
>
> Cheers,
>
> Michael
Hi Michael,
Timo is correct. O_EXCL has been supported for NFSv3 (and NFSv4) ever
since the 2.6 series kernels came out.
However, please note that
* it is not supported for any 2.4.x kernels, since that would
require some VFS re-engineering that is not compatible with the
'stable kernel' rules.
* As Timo states, the NFSv2 protocol cannot support O_EXCL
semantics.
I think the second point warrants keeping the link() workaround mention,
though, since people who are interested in writing completely portable
software may still find it useful. For instance, a lot of mail delivery
setups are still using the type of locking scheme described there.
Cheers
Trond
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