On 20 Mar 2025, at 13:53, Chuck Lever wrote: > On 3/19/25 5:46 PM, NeilBrown wrote: >> On Thu, 20 Mar 2025, Dai Ngo wrote: >>> Hi, >>> >>> Currently when the local file system needs to be unmounted for maintenance >>> the admin needs to make sure all the NFS clients have stopped using any files >>> on the NFS shares before the umount(8) can succeed. >> >> This is easily achieved with >> echo /path/to/filesystem > /proc/fs/nfsd/unlock_filesystem >> >> Do this after unexporting and before unmounting. > > Seems like administrators would expect that a filesystem can be > unmounted immediately after unexporting it. Should "exportfs" be changed > to handle this extra step under the covers? Doesn't seem like it would > be hard to do, and I can't think of a use case where it would be > harmful. No. I think that admins don't expect to lose all their NFS client's state if they're managing the exports. That would be a really big and invisible change to existing behavior. Ben
