Module: VMWareCowdDisk
- Defined in:
- lib/disk/modules/VMWareCowdDisk.rb
Constant Summary collapse
- COWD_EXTENT_HEADER =
BinaryStruct.new([ 'L', 'magicNumber', 'L', 'version', 'L', 'flags', 'L', 'numSectors', 'L', 'grainSize', 'L', 'gdOffset', 'L', 'numGDEntries', 'L', 'freeSector', ])
- SIZEOF_COWD_EXTENT_HEADER =
COWD_EXTENT_HEADER.size
- GTE_SIZE =
4
- GDE_SIZE =
4
- GDE_COVERAGE =
2097152
- ENTRIES_PER_TABLE =
4096
- GT_SECTORS =
32
Instance Method Summary collapse
- #d_close ⇒ Object
- #d_init ⇒ Object
- #d_read(pos, len, _offset = 0) ⇒ Object
-
#d_size ⇒ Object
Disk size in sectors.
- #d_write(pos, buf, len, _offset = 0) ⇒ Object
- #getBase ⇒ Object
Instance Method Details
#d_close ⇒ Object
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 116 def d_close @vmwareCowDisk_file.close end |
#d_init ⇒ Object
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 25 def d_init self.diskType = "VMWare CopyOnWrite" self.blockSize = 512 fileMode = MiqDiskCommon.file_mode(dInfo) @dParent = @dInfo.parent @vmwareCowDisk_file = MiqLargeFile.open(dInfo.fileName, fileMode) buf = @vmwareCowDisk_file.read(SIZEOF_COWD_EXTENT_HEADER) @EsxSparseHeader = OpenStruct.new(COWD_EXTENT_HEADER.decode(buf)) @grainSize = @EsxSparseHeader.grainSize @grainBytes = @grainSize * blockSize @capacity = @EsxSparseHeader.numSectors * blockSize @gdStart = @EsxSparseHeader.gdOffset * blockSize @gdSize = @EsxSparseHeader.numGDEntries * GDE_SIZE end |
#d_read(pos, len, _offset = 0) ⇒ Object
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 46 def d_read(pos, len, _offset = 0) gnStart, goStart = grainPos(pos) gnEnd, goEnd = grainPos(pos + len) if gnStart == gnEnd grainPos = getGTE(gnStart) if grainPos == 0 return @dParent ? @dParent.d_read(pos, len) : MemoryBuffer.create(len) else @vmwareCowDisk_file.seek(grainPos + goStart, IO::SEEK_SET) return @vmwareCowDisk_file.read(len) end end bytesRead = 0 rv = '' gnStart.upto(gnEnd) do |gn| so = 0 l = @grainBytes if gn == gnStart so = goStart l -= so end l -= (@grainBytes - goEnd) if gn == gnEnd gp = getGTE(gn) # Mods for parent link. if gp == 0 rv << (@dParent ? @dParent.d_read(pos + bytesRead, l) : MemoryBuffer.create(l)) else @vmwareCowDisk_file.seek(gp + so, IO::SEEK_SET) rv << @vmwareCowDisk_file.read(l) end bytesRead += l end rv end |
#d_size ⇒ Object
Disk size in sectors.
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 121 def d_size @capacity / @blockSize end |
#d_write(pos, buf, len, _offset = 0) ⇒ Object
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 85 def d_write(pos, buf, len, _offset = 0) gnStart, goStart = grainPos(pos) gnEnd, goEnd = grainPos(pos + len) if gnStart == gnEnd grainPos = getGTE(gnStart) grainPos = allocGrain(gnStart) if grainPos == 0 @vmwareCowDisk_file.seek(grainPos + goStart, IO::SEEK_SET) return @vmwareCowDisk_file.write(buf, len) end bytesWritten = 0 gnStart.upto(gnEnd) do |gn| so = 0 l = @grainBytes if gn == gnStart so = goStart l -= so end l -= (@grainBytes - goEnd) if gn == gnEnd gp = getGTE(gn) gp = allocGrain(gn) if gp == 0 raise "Disk is full" if gp == -1 @vmwareCowDisk_file.seek(gp + so, IO::SEEK_SET) bytesWritten += @vmwareCowDisk_file.write(buf[bytesWritten, l], l) end bytesWritten end |
#getBase ⇒ Object
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# File 'lib/disk/modules/VMWareCowdDisk.rb', line 42 def getBase self end |