Support .zfs/snapshot access via NFS #3737
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@andrey-ve @yshui could you please review and if possible test this. Building on your previous work and some improved infrastructure from commits 0282c41 and 278bee9 I've put together a small patch which adds this missing functionality. It's been tested under RHEL6 successfully and should work for other kernels but I haven't verified that yet. |
Prevents NFS client from detection of different fileids of snapshot root dentry before & after snapshot mount. Signed-off-by: Andrey Vesnovaty <andrey.vesnovaty@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This patch is based on the previous work done by @andrey-ve and @yshui. It triggers the automount by using kern_path() to traverse to the known snapshout mount point. Once the snapshot is mounted NFS can access the contents of the snapshot. Allowing NFS clients to access to the .zfs/snapshot directory would normally mean that a root user on a client mounting an export with 'no_root_squash' would be able to use mkdir/rmdir/mv to manipulate snapshots on the server. To prevent configuration mistakes a zfs_admin_snapshot module option was added which disables the mkdir/rmdir/mv functionally. System administators desiring this functionally must explicitly enable it. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue openzfs#2797 Issue openzfs#1655 Issue openzfs#616
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