[PATCH 0/1] nvme: introduce generic per-namespace chardev

From: Minwoo Im <minwoo.im.dev@gmail.com>
To: linux-nvme@lists.infradead.org
Cc: "Keith Busch" <kbusch@kernel.org>, "Jens Axboe" <axboe@fb.com>,
	"Christoph Hellwig" <hch@lst.de>,
	"Sagi Grimberg" <sagi@grimberg.me>,
	"Javier González" <javier.gonz@samsung.com>,
	"Minwoo Im" <minwoo.im.dev@gmail.com>
Subject: [PATCH 0/1] nvme: introduce generic per-namespace chardev
Date: Thu, 25 Mar 2021 21:30:47 +0900	[thread overview]
Message-ID: <20210325123048.94784-1-minwoo.im.dev@gmail.com> (raw)

Hello,

This patch introduces per-namespace character device to I/O in case that
blkdev is not initialized properly.  Userspace applications are able to
I/O to the generic namespace chardev even there's no blkdev properly
initialized.

This patch is derived from Javier's patch series [1].  Changes from the
previous version are:

  - Update naming convention for the chardev exactly the same with the
    blkdev:
        /dev/nvme-generic-XcYnZ  to  /dev/nvme-generic-XnY

  - Re-consider the multipath support.  Rather than exposing all the
    path-specific namespace path with controller(e.g., nvmeXcYnZ), only
    expose head namespace instance in case of multipath.  Otherwise, it
    will expose all the blkdevs created.

[1] https://lore.kernel.org/linux-nvme/20210301192452.16770-1-javier.gonz@samsung.com/

Minwoo Im (1):
  nvme: introduce generic per-namespace chardev

 drivers/nvme/host/core.c      | 170 +++++++++++++++++++++++++++++++++-
 drivers/nvme/host/multipath.c |  17 ++++
 drivers/nvme/host/nvme.h      |  25 +++++
 3 files changed, 209 insertions(+), 3 deletions(-)

-- 
2.27.0

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