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    md: Allow md devices to be created by name. · efeb53c0
    NeilBrown 提交于
    Using sequential numbers to identify md devices is somewhat artificial.
    Using names can be a lot more user-friendly.
    
    Also, creating md devices by opening the device special file is a bit
    awkward.
    
    So this patch provides a new option for creating and naming devices.
    
    Writing a name such as "md_home" to
        /sys/modules/md_mod/parameters/new_array
    will cause an array with that name to be created.  It will appear in
    /sys/block/ /proc/partitions and /proc/mdstat as 'md_home'.
    It will have an arbitrary minor number allocated.
    
    md devices that a created by an open are destroyed on the last
    close when the device is inactive.
    For named md devices, they will not be destroyed until the array
    is explicitly stopped, either with the STOP_ARRAY ioctl or by
    writing 'clear' to /sys/block/md_XXXX/md/array_state.
    
    The name of the array must start 'md_' to avoid conflict with
    other devices.
    Signed-off-by: NNeilBrown <neilb@suse.de>
    efeb53c0
md_k.h 11.9 KB