• Dan Williams's avatar
    libnvdimm: infrastructure for btt devices · 8c2f7e86
    Dan Williams authored
    NVDIMM namespaces, in addition to accepting "struct bio" based requests,
    also have the capability to perform byte-aligned accesses.  By default
    only the bio/block interface is used.  However, if another driver can
    make effective use of the byte-aligned capability it can claim namespace
    interface and use the byte-aligned ->rw_bytes() interface.
    
    The BTT driver is the initial first consumer of this mechanism to allow
    adding atomic sector update semantics to a pmem or blk namespace.  This
    patch is the sysfs infrastructure to allow configuring a BTT instance
    for a namespace.  Enabling that BTT and performing i/o is in a
    subsequent patch.
    
    Cc: Greg KH <[email protected]>
    Cc: Neil Brown <[email protected]>
    Signed-off-by: default avatarDan Williams <[email protected]>
    8c2f7e86
namespace_devs.c 44 KB