Re: device mapper and the BLKFLSBUF ioctl

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Subject: Re: device mapper and the BLKFLSBUF ioctl
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 25 Oct 2016 06:07:12 -0700
Cc: dm-devel@xxxxxxxxxx, Mikulas Patocka <mpatocka@xxxxxxxxxx>, "Alasdair G. Kergon" <agk@xxxxxxxxxx>
In-reply-to: <20161024155756.GA48306@redhat.com>
References: <alpine.LRH.2.02.1610211406290.9197@file01.intranet.prod.int.rdu2.redhat.com> <20161021200022.GA12580@redhat.com> <alpine.LRH.2.02.1610211616450.31606@file01.intranet.prod.int.rdu2.redhat.com> <20161024155756.GA48306@redhat.com>
User-agent: Mutt/1.6.1 (2016-04-27)

I think the right fix is to kill off the BLKFLSBUF special case in
brd.  Yes, it break compatibility - but in this case the compatibility
breaks more than it helps.

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Follow-Ups:
- [PATCH] brd: remove support for BLKFLSBUF
  - From: Mike Snitzer

References:
- device mapper and the BLKFLSBUF ioctl
  - From: Mikulas Patocka
- Re: device mapper and the BLKFLSBUF ioctl
  - From: Mike Snitzer
- Re: device mapper and the BLKFLSBUF ioctl
  - From: Mikulas Patocka
- Re: device mapper and the BLKFLSBUF ioctl
  - From: Mike Snitzer

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