Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()

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To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 18 Jun 2018 10:11:13 +0200
Cc: Jason Gunthorpe <jgg@xxxxxxxx>, john.hubbard@xxxxxxxxx, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Christopher Lameter <cl@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-rdma <linux-rdma@xxxxxxxxxxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>
In-reply-to: <CAPcyv4gayKk_zHDYAvntware12qMXWjnnL_FDJNUQsJS_zNfDw@mail.gmail.com>
References: <20180617012510.20139-1-jhubbard@nvidia.com> <20180617012510.20139-3-jhubbard@nvidia.com> <CAPcyv4i=eky-QrPcLUEqjsASuRUrFEWqf79hWe0mU8xtz6Jk-w@mail.gmail.com> <20180617200432.krw36wrcwidb25cj@ziepe.ca> <CAPcyv4gayKk_zHDYAvntware12qMXWjnnL_FDJNUQsJS_zNfDw@mail.gmail.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Sun, Jun 17, 2018 at 01:10:04PM -0700, Dan Williams wrote:
> I believe kernel behavior regression is a primary concern as now
> fallocate() and truncate() can randomly fail where they didn't before.

Fail or block forever due to actions of other unprivileged users.

That is a complete no-go.

Follow-Ups:
- Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
  - From: Leon Romanovsky

References:
- [PATCH 0/2] mm: gup: don't unmap or drop filesystem buffers
  - From: john . hubbard
- [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
  - From: john . hubbard
- Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
  - From: Dan Williams
- Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
  - From: Jason Gunthorpe
- Re: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
  - From: Dan Williams

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