linux-kernel - [PATCH 0/3] block: blk_interposer

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Date:   Wed, 9 Dec 2020 16:01:48 +0300
From:   Sergei Shtepa <sergei.shtepa@...am.com>
To:     <axboe@...nel.dk>, <johannes.thumshirn@....com>,
        <koct9i@...il.com>, <ming.lei@...hat.com>, <snitzer@...hat.com>,
        <hare@...e.de>, <josef@...icpanda.com>, <steve@....org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <pavel.tide@...am.com>, <sergei.shtepa@...am.com>
Subject: [PATCH 0/3] block: blk_interposer - Block Layer Interposer

Hi all.

I try to suggest the Block Layer Interposer (blk_interposer) again.
It`s allows to intercept bio requests, remap bio to another devices
or add new bios.

Initially, blk_interposer was designed to be compatible with
device mapper. Our (my and Hannes) previous attempt to offer
blk_interposer integrated with device mapper did not receive
any comments from the dm-devel team, and without their help
I will not be able to make a full implementation. I hope later
they will have time to support blk_interposer in device mapper.

And my blk-snap module requires an architecture change to
support blk_interposer.

This time I offer it along with a sample.
Despite the fact that blk_interposer is quite simple,
there are a few non-obvious points that I would like to clarify.

However, I suggest the blk_interposer now so that people
could discuss it and use it in their projects as soon as possible.

Sergei Shtepa (3):
  block: blk_interposer - Block Layer Interposer
  block: blk_interposer - sample
  block: blk_interposer - sample config

 block/blk-core.c                        |  32 +++
 include/linux/blk_types.h               |   6 +-
 include/linux/genhd.h                   |  12 +-
 samples/Kconfig                         |   7 +
 samples/Makefile                        |   1 +
 samples/blk_interposer/Makefile         |   2 +
 samples/blk_interposer/blk-interposer.c | 276 ++++++++++++++++++++++++
 7 files changed, 333 insertions(+), 3 deletions(-)
 create mode 100644 samples/blk_interposer/Makefile
 create mode 100644 samples/blk_interposer/blk-interposer.c

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2.20.1