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    Subject[PATCH 0/5 v2] Support for Open-Channel SSDs
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    A problem with SSDs is that they expose a narrow read/write interface,
    where the host and device must communicate their intent. The narrow
    interface leaves little information to be carried down from file-systems
    and applications, and therefore performance guarantees in these devices
    are best-efforts.

    In the case of SSDs, there are various approaches to mitigate it.
    Examples include trim and multi-streams. However, these approaches are
    specialized by each vendor, each having their own behavior. More
    importantly, they do not allow the host to completely control data
    placement, parallelism and garbage collection.

    By exposing the physical characteristics of an SSD to the host,
    file-systems and applications can directly place data and control when
    and where garbage collection should be applied. We call the class of
    SSDs that expose these physical characteristics Open-Channel SSDs.

    For this class of SSDs, LightNVM is a specification that defines a
    common interface. It allows the host to manage data placement, garbage
    collection, and parallelism. With it, the kernel can expose a building
    block for further integration into file-systems and applications.
    Immediate benefits include strict control of access latency and IO
    response variance.

    This patchset wires up support in the block layer, introduces a simple
    block device target called rrpc, and at last adds support in the
    null_blk and NVMe drivers.

    Patches are against v4.0.

    Development and further information on LightNVM can be found at:

    https://github.com/OpenChannelSSD/linux

    Changes since v1:

    - Splitted LightNVM into two parts. A get/put interface for flash
    blocks and the respective targets that implement flash translation
    layer logic.
    - Updated the patches accordring to the LightNVM specification changes.
    - Added interface to add/remove targets for a block device.

    Matias Bjørling (5):
    blk-mq: Add prep/unprep support
    blk-mq: Support for Open-Channel SSDs
    lightnvm: RRPC target
    null_blk: LightNVM support
    nvme: LightNVM support

    Documentation/block/null_blk.txt | 8 +
    block/Kconfig | 12 +
    block/Makefile | 2 +-
    block/blk-mq.c | 40 +-
    block/blk-nvm.c | 722 ++++++++++++++++++++++
    block/blk-sysfs.c | 11 +
    block/blk.h | 18 +
    drivers/Kconfig | 2 +
    drivers/Makefile | 2 +
    drivers/block/null_blk.c | 89 ++-
    drivers/block/nvme-core.c | 380 +++++++++++-
    drivers/lightnvm/Kconfig | 29 +
    drivers/lightnvm/Makefile | 5 +
    drivers/lightnvm/rrpc.c | 1222 ++++++++++++++++++++++++++++++++++++++
    drivers/lightnvm/rrpc.h | 203 +++++++
    include/linux/bio.h | 9 +
    include/linux/blk-mq.h | 3 +
    include/linux/blk_types.h | 12 +-
    include/linux/blkdev.h | 218 +++++++
    include/linux/lightnvm.h | 55 ++
    include/linux/nvme.h | 2 +
    include/uapi/linux/nvm.h | 70 +++
    include/uapi/linux/nvme.h | 116 ++++
    23 files changed, 3217 insertions(+), 13 deletions(-)
    create mode 100644 block/blk-nvm.c
    create mode 100644 drivers/lightnvm/Kconfig
    create mode 100644 drivers/lightnvm/Makefile
    create mode 100644 drivers/lightnvm/rrpc.c
    create mode 100644 drivers/lightnvm/rrpc.h
    create mode 100644 include/linux/lightnvm.h
    create mode 100644 include/uapi/linux/nvm.h

    --
    1.9.1



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