Red Hat Bugzilla – Bug 3504
fh_verify and nfs_rpc_verify: read-only access on a volume mounted read-write
Last modified: 2008-05-01 11:37:50 EDT
I will call the two Red Hat 6.0 machines server and client. They share password information via NIS. User john's home directory is in server:/home/john and server:/home is exported read-write to the subnet which includes client. When he logs into client, the home directory is automounted as client:/homes/john. All files are accessible, but whenever john tries to write to the filesystem (creating new files, deleting, etc), access is denied. So when he tries to execute 'touch testfile' in his home directory, the error message appears on the terminal: 'touch: testfile: Read-only file system' and the file is not created. At the same time, kernel on server logs this message to syslog: kernel: fh_verify: john/.bash_history permission failure, acc=2, error=30 The syslog on client registers: nfs_rpc_verify: RPC call rejected: 1 nfs_statfs: statfs error = 5 Needless to say, this mounting worked perfectly when both machines were RedHat 5.2. The same happens if the server is Red Hat 6.0 and the client Red Hat 5.2.
IIRC, the convention for access to a file system has changed. In 5.2, if no access was specified, rw was assumed. In 6.0, ro is assumed. Try exporting the file system with explicit rw access.
Your recommendation has done the trick. I thought I had tried that when I was submitting the bug report. I changed the old export entry 192.0.0.0/255.255.255.0 to 192.0.0.0/255.255.255.0(rw) and everything works. Thanks!
This problem appears to be fixed.
The documentation is wrong, though. From the exports(5) man page: ro Allow only read-only requests on this NFS volume. The default is to allow write requests as well, which can also be made explicit by using the rw option.