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Contents
module Lvm2Thin
class DataMap < BTree
TIME_MASK = (1 << 24) - 1
def initialize(superblock, root_address)
super superblock, root_address, MAPPING_DETAILS
end
alias :device_blocks :keys
def entries
@dmentries ||= begin
super.collect do |entry|
value = entry['value']
internal? ? DataMap.new(@superblock, @superblock.md_block_address(value)) :
[extract_data_block(value), extract_time(value)]
end
end
end
def total_blocks
@total_blocks ||= begin
t = 0
entries.each do |entry|
t += entry.kind_of?(DataMap) ? entry.total_blocks : 1
end
t
end
end
def block?(blk)
blk < total_blocks
end
def data_block(device_block)
device_blocks.reverse.each do |map_device_block|
if map_device_block <= device_block
entry = entry_for(map_device_block)
return entry.data_block(device_block) if entry.is_a?(DataMap)
raise RuntimeError, "LVM2Thin cannot find device block: #{device_block} (closest: #{map_device_block})" unless map_device_block == device_block
return entry.first
end
end
raise RuntimeError, "LVM2Thin could not find data block for #{device_block}"
end
private
def extract_data_block(value)
value >> 24
end
def extract_time(value)
value & TIME_MASK
end
end
end # module Lvm2Thin
Version data entries
61 entries across 61 versions & 1 rubygems