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Date:   Thu, 13 Jun 2019 12:12:18 -0300
From:   Jason Gunthorpe <>
To:     Dan Williams <>
Cc:     Ira Weiny <>, Jan Kara <>,
        Theodore Ts'o <>,
        Jeff Layton <>,
        Dave Chinner <>,
        Matthew Wilcox <>,
        linux-xfs <>,
        Andrew Morton <>,
        John Hubbard <>,
        Jérôme Glisse <>,
        linux-fsdevel <>,
        Linux Kernel Mailing List <>,
        linux-nvdimm <>,
        linux-ext4 <>,
        Linux MM <>
Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal

On Wed, Jun 12, 2019 at 03:54:19PM -0700, Dan Williams wrote:
> > > My preference would be to avoid this scenario, but if it is really
> > > necessary, we could probably build it with some work.
> > >
> > > The only case we use it today is forced HW hot unplug, so it is rarely
> > > used and only for an 'emergency' like use case.
> >
> > I'd really like to avoid this as well.  I think it will be very confusing for
> > RDMA apps to have their context suddenly be invalid.  I think if we have a way
> > for admins to ID who is pinning a file the admin can take more appropriate
> > action on those processes.   Up to and including killing the process.
> Can RDMA context invalidation, "device disassociate", be inflicted on
> a process from the outside? 

Yes, but it is currently only applied to the entire device - ie you do
'rmmod mlx5_ib' and all the running user space process see that their
FD has moved to some error and the device is broken.

Targetting the disassociate of only a single FD would be a new thing.


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