linux-kernel - [RFC PATCH v2 0/1] lightnvm: move bad block and chunk state logic to core

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Date:   Thu, 16 Aug 2018 13:34:16 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     igor.j.konopko@...el.com, marcin.dziegielewski@...el.com,
        javier@...xlabs.com, hans.holmberg@...xlabs.com, hlitz@...c.edu,
        youngtack.jin@...cuitblvd.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matias Bjørling <mb@...htnvm.io>
Subject: [RFC PATCH v2 0/1] lightnvm: move bad block and chunk state logic to core

This patch moves the 1.2 and 2.0 block/chunk metadata retrieval to
core.

Hi Javier, I did not end up using your patch. I had misunderstood what
was implemented. Instead I implemented the detection of the each chunk by
first sensing the first page, then the last page, and if the chunk
is sensed as open, a per page scan will be executed to update the write
pointer appropriately.

Note that one needs a real drive to test the implementation. The 1.2
qemu implementation is lacking. I did update it a bit, such that
it defaults to all blocks being free. It can be picked up in the ocssd
qemu repository.

Changes since v1:

  - Add sensing of chunks wrt to free/open/closed
  - Add update of write pointer if chunk state is open

Matias Bjørling (1):
  lightnvm: move bad block and chunk state logic to core

 drivers/lightnvm/core.c      | 310 +++++++++++++++++++++++++++++++++++--------
 drivers/lightnvm/pblk-core.c |   6 +-
 drivers/lightnvm/pblk-init.c | 116 +---------------
 drivers/lightnvm/pblk.h      |   2 +-
 drivers/nvme/host/lightnvm.c |   4 +-
 include/linux/lightnvm.h     |  15 +--
 6 files changed, 266 insertions(+), 187 deletions(-)

-- 
2.11.0