Red Hat Bugzilla – Bug 243875
NFS option confusion when mounting same share multiple times
Last modified: 2008-03-20 11:49:27 EDT
Description of problem: When mounting the same share in two different locations on a local machine, with different mount options. The one mounted first overwrites the options of the second. Version-Release number of selected component (if applicable): util-linux-2.13-0.46.fc6 nfs-utils-1.0.10-10.fc6 nfs-utils-lib-1.0.8-7.2 How reproducible: Every time Steps to Reproduce: in fstab: myserver:/vol/fedora/build/koji /mnt/koji nfs ro,defaults 0 0 myserver:/vol/fedora/build/koji /mashroot/mnt/koji nfs rw,defaults 0 0 Actual results: /mnt/koji and /mashroot/mnt/koji/ are both mounted ro. Also when running a 'mount' it appears the mount is mounted rw but it is a ro mount. The reverse is also true if /mashroot/mnt/koji/ is mounted first. Expected results: /mnt/koji should be mounted ro /mashroot/mnt/koji should be mounted rw Additional info: This is a Fedora box and we can grant access if needed.
It appears that mtab is reporting incorrectly but /proc/mounts is reporting correct.
This broke back in the 2.6.18 kernel... and should be fixed in the next main stream kernel release with the following commit: commit 608a2896d6d9079b97715820ae8a5469e70bdecc Author: Trond Myklebust <Trond.Myklebust@netapp.com> Date: Wed May 16 16:53:28 2007 -0400 NFS: Error when mounting the same filesystem with different options Unless the user sets the NFS_MOUNT_NOSHAREDCACHE mount flag, we should return EBUSY if the filesystem is already mounted on a superblock that has set conflicting mount options. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Which is relative to the NFS maintainer's tree... Its not clear where there will be any more kernel updates for FC6. But if there is, I'll ask our kernel maintainers to include this patch. Note there also need to be an nfs-utils update as well..