Module: VMWareDescriptor
- Defined in:
- lib/disk/modules/VMWareDescriptor.rb
Instance Method Summary collapse
-
#d_close ⇒ Object
Close all disks.
- #d_init ⇒ Object
- #d_read(pos, len) ⇒ Object
-
#d_size ⇒ Object
Return size in sectors.
- #d_write(pos, buf, len) ⇒ Object
- #getBase ⇒ Object
-
#getDiskByteOffset(target) ⇒ Object
Get beginning byte offset of target disk.
-
#getTargetDiskIndex(sector) ⇒ Object
Get target disk index based on sector number.
Instance Method Details
#d_close ⇒ Object
Close all disks.
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 122 def d_close @parent.close unless @parent.nil? @disks.each(&:close) end |
#d_init ⇒ Object
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 4 def d_init # Check to see if a descriptor was not embedded. descriptor = dInfo.Descriptor if descriptor.nil? f = File.open(dInfo.fileName, "rb") descriptor = f.read; f.close end # Make sure this is a descriptor. desc, defs = parseDescriptor(descriptor, dInfo.fileName) raise "No disk definitions" if defs.size == 0 # Make sure each disk is there. defs.each do|diskDef| raise "No disk file: #{diskDef['filename']}" unless File.exist?(diskDef['filename']) end # Init needed stff. self.diskType = "VMWare Descriptor" self.blockSize = 512 @desc = desc # This disk descriptor. @defs = defs # Disk extent definitions. @ostructs = [] # Component OpenStructs for disk objects. @disks = [] # Component MiqDisk objects (one for each disk). # If there's a parent parse it first (all subordinate disks need a ref to parent). if desc.key?('parentFileNameHint') @parentOstruct = OpenStruct.new # Get the parentFileNameHint and be sure it is relative to the descriptor file's directory parentFileName = Pathname.new(desc['parentFileNameHint']) if parentFileName.absolute? parentFileName = parentFileName.relative_path_from(Pathname.new(dInfo.fileName).dirname) $log.debug "VMWareDescriptor: Parent disk file is absolute. Using relative path [#{parentFileName}]" if $log end parentFileName = File.dirname(dInfo.fileName) + "/" + parentFileName.to_s.tr("\\", "/") $log.debug "VMWareDescriptor: Getting parent disk file [#{parentFileName}]" if $log @parentOstruct.fileName = parentFileName @parentOstruct.mountMode = dInfo.mountMode @parentOstruct.hardwareId = dInfo.hardwareId if dInfo.baseOnly d = MiqDisk.getDisk(@parentOstruct) raise "MiqDisk#getDisk returned nil for parent disk #{@parentOstruct.fileName}" if d.nil? @parent = d return if dInfo.baseOnly end # Instance MiqDisks for each disk definition. defs.each do |diskDef| thisO = OpenStruct.new thisO.Descriptor = dInfo.Descriptor if dInfo.Descriptor thisO.parent = @parent thisO.fileName = diskDef['filename'] thisO.offset = diskDef['offset'] thisO.rawDisk = true if diskDef['type'].strip == 'FLAT' thisO.rawDisk = true if diskDef['type'].strip == 'VMFS' thisO.mountMode = dInfo.mountMode @ostructs << thisO d = MiqDisk.getDisk(thisO) raise "MiqDisk#getDisk returned nil for component disk #{thisO.fileName}" if d.nil? @disks << d end end |
#d_read(pos, len) ⇒ Object
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 71 def d_read(pos, len) # $log.debug "VMWareDescriptor.d_read << pos #{pos} len #{len}" if $log && $log.debug? # Get start and end extents. dStart = getTargetDiskIndex((pos / @blockSize).ceil) dEnd = getTargetDiskIndex(((pos + len) / @blockSize).ceil) if dStart == dEnd # Case: single extent. retBytes = @disks[dStart].d_read(pos, len, getDiskByteOffset(dStart)) else # Case: span extents. retBytes = ""; bytesRead = 0 dStart.upto(dEnd) do |diskIdx| readLen = @disks[diskIdx].d_size # Adjust length for start and end extents. readLen -= pos if diskIdx == dStart readLen -= (len - bytesRead) if diskIdx == dEnd # Read. retBytes << @disks[diskIdx].d_read(pos + bytesRead, readLen, getDiskByteOffset(diskIdx)) bytesRead += readLen end end # $log.debug "VMWareDescriptor.d_read >> retBytes.length #{retBytes.length}" if $log && $log.debug? retBytes end |
#d_size ⇒ Object
Return size in sectors.
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 128 def d_size total = 0 @defs.each { |diskDef| total += diskDef['size'].to_i } total end |
#d_write(pos, buf, len) ⇒ Object
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 99 def d_write(pos, buf, len) dStart = getTargetDiskIndex((pos / @blockSize).ceil) dEnd = getTargetDiskIndex(((pos + len) / @blockSize).ceil) # Case: single extent. return @disks[dStart].d_write(pos, buf, len, getDiskByteOffset(dStart)) if dStart == dEnd # Case: span extents. bytesWritten = 0 dStart.upto(dEnd) do |diskIdx| writeLen = @disks[diskIdx].d_size # Adjust length for start and end extents. writeLen -= pos if diskIdx == dStart writeLen -= (len - bytesWritten) if diskIdx == dEnd # Write. bytesWritten += @disks[diskIdx].d_write(pos + bytesWritten, writeLen, getDiskByteOffset(diskIdx)) end bytesWritten end |
#getBase ⇒ Object
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 67 def getBase @parent || self end |
#getDiskByteOffset(target) ⇒ Object
Get beginning byte offset of target disk.
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 150 def getDiskByteOffset(target) total = 0 0.upto(@defs.size - 1) do|idx| break if idx == target total += @defs[idx]['size'].to_i end total * @blockSize end |
#getTargetDiskIndex(sector) ⇒ Object
Get target disk index based on sector number.
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# File 'lib/disk/modules/VMWareDescriptor.rb', line 135 def getTargetDiskIndex(sector) dIdx = -1; total = 0 0.upto(@defs.size - 1) do|idx| total += @defs[idx]['size'].to_i if total >= sector dIdx = idx break end end raise "Sector is past end of disk: #{sector}" if dIdx == -1 raise "Disk object is nil for #{sector}" if @disks[dIdx].nil? dIdx end |