Path: utzoo!attcan!uunet!mcsun!ukc!edcastle!aiai!richard
From: richard@aiai.ed.ac.uk (Richard Tobin)
Newsgroups: comp.protocols.nfs
Subject: Some NFS questions
Message-ID: <3007@skye.ed.ac.uk>
Date: 17 Jul 90 13:10:51 GMT
Reply-To: richard@aiai.UUCP (Richard Tobin)
Organization: AIAI, University of Edinburgh, Scotland
Lines: 24

I'm writing an NFS server (so that I can mount Minix disks on a Sparcstation)
and I've got a few naive questions:

(1) What is the meaning of the "count" argument to readdir?  Is it the
total size of the filenames, entry structures and readdirres
structure?  I can't find an interpretation that is consistent with
what the Sun NFS server returns.

(2) The blocksize component of a fattr is described as "the size in bytes
of a block of the file".  However, du(1) seems to assume the blocksize
is 512 bytes regardless.  The blocksize I give shows up as the st_blksize
returned by stat(2), which is described as the "optimal blocksize for
file system i/o ops".  Which is right?

(3) What is meant to happen if the read returns fewer than "count"
bytes?  The client kernel doesn't seem to ask for more.  Is this right?

Thanks,
 Richard

-- 
Richard Tobin,                       JANET: R.Tobin@uk.ac.ed             
AI Applications Institute,           ARPA:  R.Tobin%uk.ac.ed@nsfnet-relay.ac.uk
Edinburgh University.                UUCP:  ...!ukc!ed.ac.uk!R.Tobin