Re: Are NFS handles stable across major updates?

[Jason Thorpe <thorpej%me.com@localhost>]

> On Dec 13, 2024, at 5:28 AM, Edgar Fuß <ef%math.uni-bonn.de@localhost> wrote:
> 
> May I re-ask my question:
>> When I take down an NFS server, update the base system (say, from -6 to -8), 
>> and bring it up again, will clients that have NFS handles open across the 
>> downtime/update access the same files (under the assumption that I mount 
>> everything to the same place after the update) under their handles?
> 
>> In other words: is the NFS handle to VFS whatever stable across NetBSD 
>> versions?
> My impression is that ffs_vptofh() and {ffs,ufs}_fhtovp() haven't changed 
> for ages, but is this sufficient for NFS handles staying stable across an 
> update from -6 to -8?

It entirely depends on how an individual file system implements those methods, which may also include “which dev_t does the device have”.  If you plug in another disk, and they suddenly enumerate in a different order, it’s entirely possible they won’t be stable **across re-boots**.

-- thorpej