• Matias Bjørling's avatar
    lightnvm: Support for Open-Channel SSDs · cd9e9808
    Matias Bjørling authored
    Open-channel SSDs are devices that share responsibilities with the host
    in order to implement and maintain features that typical SSDs keep
    strictly in firmware. These include (i) the Flash Translation Layer
    (FTL), (ii) bad block management, and (iii) hardware units such as the
    flash controller, the interface controller, and large amounts of flash
    chips. In this way, Open-channels SSDs exposes direct access to their
    physical flash storage, while keeping a subset of the internal features
    of SSDs.
    
    LightNVM is a specification that gives support to Open-channel SSDs
    LightNVM allows the host to manage data placement, garbage collection,
    and parallelism. Device specific responsibilities such as bad block
    management, FTL extensions to support atomic IOs, or metadata
    persistence are still handled by the device.
    
    The implementation of LightNVM consists of two parts: core and
    (multiple) targets. The core implements functionality shared across
    targets. This is initialization, teardown and statistics. The targets
    implement the interface that exposes physical flash to user-space
    applications. Examples of such targets include key-value store,
    object-store, as well as traditional block devices, which can be
    application-specific.
    
    Contributions in this patch from:
    
      Javier Gonzalez <jg@lightnvm.io>
      Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
      Jesper Madsen <jmad@itu.dk>
    Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    cd9e9808
lightnvm.h 11.2 KB