linux-kernel - [PATCH v2 0/4] Diskseq support in device-mapper

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Date:   Sat, 24 Jun 2023 19:09:43 -0400
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com
Cc:     Demi Marie Obenour <demi@...isiblethingslab.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/4] Diskseq support in device-mapper

This work aims to allow userspace to create and destroy device-mapper
devices in a race-free way.

Changes since v1:

- Potentially backwards-incompatible changes to device-mapper now
  require userspace opt-in.
- The code has been tested: I have a block script written in C that uses
  these changes to successfully boot a Xen VM.
- The core block layer is completely untouched.  Instead of exposing a
  block device inode directly to userspace, device-mapper ioctls that
  create a block device now return that device's diskseq.  Userspace can
  then use that diskseq to safely open the device.  Furthermore, ioctls
  that operate on an existing device-mapper device now accept a diskseq
  parameter, which can be used to prevent races.

Demi Marie Obenour (4):
  dm ioctl: Allow userspace to opt-in to strict parameter checks
  dm ioctl: Allow userspace to provide expected diskseq
  dm ioctl: Allow userspace to suppress uevent generation
  dm ioctl: inform caller about already-existing device

 drivers/md/dm-core.h          |   2 +
 drivers/md/dm-ioctl.c         | 351 ++++++++++++++++++++++++++++------
 drivers/md/dm.c               |   5 +-
 include/linux/device-mapper.h |   2 +-
 include/uapi/linux/dm-ioctl.h |  90 ++++++++-
 5 files changed, 382 insertions(+), 68 deletions(-)

-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab