Date: 23 Jan 2001 17:26:54 +0100 From: Bjoern Groenvall <bg@sics.se> To: FreeBSD Stable <freebsd-stable@FreeBSD.ORG> Cc: Linux NFS mailing list <nfs@lists.sourceforge.net>, Guy Harris <gharris@flashcom.net>, Neil Brown <neilb@cse.unsw.edu.au>, matthias.andree@stud.uni-dortmund.de Subject: Re: [NFS] Incompatible: FreeBSD 4.2 client, Linux 2.2.18 nfsv3 server, read-only export Message-ID: <wuofwynsj5.fsf_-_@bg.sics.se> In-Reply-To: Matthias Andree's message of "Tue, 23 Jan 2001 16:29:30 %2B0100" References: <20010123015612.H345@quadrajet.flashcom.com> <20010123162930.B5443@emma1.emma.line.org>
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>>>>> "Matthias" == Matthias Andree <matthias.andree@stud.uni-dortmund.de> writes:
Matthias> The question remains: Linux kernel problem or FreeBSD client
Matthias> problem?
Or perhaps we should blame RFC1813? However, 1813 says that ACCESS
should return one of the following errors
NFS3ERR_IO
NFS3ERR_STALE
NFS3ERR_BADHANDLE
NFS3ERR_SERVERFAULT
,and "The client encodes the
set of permissions that are to be checked in a bit mask.
The server checks the permissions encoded in the bit mask.
A status of NFS3_OK is returned along with a bit mask
encoded with the permissions that the client is allowed.".
It also says
"NFS3ERR_ROFS
Read-only file system. A modifying operation was
attempted on a read-only file system."
The RFC does not explicitly mention how to handle read-only file
systems. I think it would be really nice if the server returns those
permissions that the client is allowed with the write bits unset. That
is also the solution that Guy came up with.
Guy> Perhaps the Linux server should, in "nfsd_access()", treat "nfserr_rofs"
Guy> the same way it treats "nfserr_perm" and "nfserr_acces", and just say
Guy> the access type is denied but the access query succeeded, doing the same
Guy> thing that Solaris and a future release of the NetApp software will do.
Cheers,
Björn
--
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Swedish Institute of Computer Science | ||
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Email: bg@sics.se, Phone +46 -8 633 15 25 | Cat |/
Cellular +46 -70 768 06 35, Fax +46 -8 751 72 30 `---------------'
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