Re: [RFC PATCH 0/7] SUNRPC: Create sysfs files for changing IP

Olga Kornievskaia
2021-01-14T20:30:12Z

On Wed, Jan 13, 2021 at 9:18 PM Chuck Lever <chuck.lever@oracle.com> wrote:
>
>
> > On Jan 13, 2021, at 2:48 PM, Chuck Lever <chuck.lever@oracle.com> wrote:
> >
> >> On Jan 13, 2021, at 2:23 PM, Anna Schumaker <schumaker.anna@gmail.com> wrote:
> >>
> >> On Tue, Jan 12, 2021 at 11:59 AM J. Bruce Fields <bfields@fieldses.org> wrote:
> >>>
> >>> On Tue, Jan 12, 2021 at 08:09:09AM -0500, Chuck Lever wrote:
> >>>> Hi Anna-
> >>>>
> >>>>> On Jan 11, 2021, at 4:41 PM, schumaker.anna@gmail.com wrote:
> >>>>>
> >>>>> From: Anna Schumaker <Anna.Schumaker@Netapp.com>
> >>>>>
> >>>>> It's possible for an NFS server to go down but come back up with a
> >>>>> different IP address. These patches provide a way for administrators to
> >>>>> handle this issue by providing a new IP address for xprt sockets to
> >>>>> connect to.
> >>>>>
> >>>>> This is a first draft of the code, so any thoughts or suggestions would
> >>>>> be greatly appreciated!
> >>>>
> >>>> One implementation question, one future question.
> >>>>
> >>>> Would /sys/kernel/net be a little better? or /sys/kernel/sunrpc ?
> >>
> >> Possibly! I was trying to match /sys/fs/nfs, but I can definitely
> >> change this if another location is better.
> >
> > Ah... since this is a supplement to the mount() interface, maybe
> > placing this new API under /sys/fs/nfs/ might make some sense.
>
> Or you could implement it with "-o remount,addr=new-address".

A change of address is currently not allowed by the NFS because
multiple mounts might be sharing a superblock and change of one
mount's option would not be correct. The way things work from this new
mechanism is system wide and all mounts are affected.

>
>
> --
> Chuck Lever
>
>
>