From konq-bugs  Sun Jul 31 00:11:22 2005
From: Andrew de Quincey <adq_dvb () lidskialf ! net>
Date: Sun, 31 Jul 2005 00:11:22 +0000
To: konq-bugs
Subject: [Bug 109918] New: kio-nfs - doesn't work with linux TCP based NFS
Message-Id: <20050731021117.109918.adq_dvb () lidskialf ! net>
X-MARC-Message: https://marc.info/?l=konq-bugs&m=112276870710698

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http://bugs.kde.org/show_bug.cgi?id=109918         
           Summary: kio-nfs - doesn't work with linux TCP based NFS servers
           Product: konqueror
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konq-bugs kde org
        ReportedBy: adq_dvb lidskialf net


Version:            (using KDE KDE 3.4.1)
Installed from:    Gentoo Packages
Compiler:          gcc 3.4.4 
OS:                Linux

If I use nfs:// to browse a TCP NFS file server, copying files TO the server larger than a certain length fails - it'll definitely happen with > 20k files. Other operations work fine.

The server reports: RPC: bad TCP reclen 0x00000f9c (non-terminal) in dmesg.

This is because the linux sunrpc implementation is incomplete and cannot handle fragmented sunrpc requests. If you look at the relevant code in net/sunrpc/svcsock.c/svc_tcp_recvfrom() in a recent kernel, you see the following:
			/* FIXME: technically, a record can be fragmented,
			 *  and non-terminal fragments will not have the top
			 *  bit set in the fragment length header.
			 *  But apparently no known nfs clients send fragmented
			 *  records. */

I can't figure out why KDE/glibc's sunrpc client implementation is sending fragmented records and I don't have the time to fix the kernel sunrpc implementation.

A simple "fix" would be to disable TCP NFS support from kio_nfs completely, and rely on UDP only (UDP works fine BTW). But obviously this isn't great :(

I'm using glibc 2.3.5 BTW.
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