Jeff Layton wrote:
When remounting an NFS or NFS4 filesystem, the new NFS options are not respected, yet the remount will still return success. This patch adds a remount_fs sb op for NFS that checks any new nfs mount options against the existing ones and fails the mount if any have changed. This is only implemented for string-based mount options since doing this with binary options isn't really feasible.
It might be feasible if mount.nfs were smart enough to read /etc/mtab and merge the old mount options with the remount options.
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