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    md: support updating bitmap parameters via sysfs. · 43a70507
    NeilBrown 提交于
    A new attribute directory 'bitmap' in 'md' is created which
    contains files for configuring the bitmap.
    'location' identifies where the bitmap is, either 'none',
    or 'file' or 'sector offset from metadata'.
    Writing 'location' can create or remove a bitmap.
    Adding a 'file' bitmap this way is not yet supported.
    'chunksize' and 'time_base' must be set before 'location'
    can be set.
    
    'chunksize' can be set before creating a bitmap, but is
    currently always over-ridden by the bitmap superblock.
    
    'time_base' and 'backlog' can be updated at any time.
    Signed-off-by: NNeilBrown <neilb@suse.de>
    Reviewed-by: NAndre Noll <maan@systemlinux.org>
    43a70507
bitmap.c 50.1 KB