Class: XFS::AllocationGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/fs/xfs/allocation_group.rb

Overview

//////////////////////////////////////////////////////////////////////////// // Class.

Constant Summary collapse

AG_FREESPACE_SIZE = 
512
AG_INODEINFO_SIZE = 
512
AG_FREELIST_SIZE = 
512
XFS_AGF_MAGIC = 
0x58414746
XFS_AGI_MAGIC = 
0x58414749
XFS_AGFL_MAGIC = 
0x5841464c

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stream, _agno, sb) ⇒ AllocationGroup

Returns a new instance of AllocationGroup.



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# File 'lib/fs/xfs/allocation_group.rb', line 105

def initialize(stream, _agno, sb)
  raise "XFS::AllocationGroup.initialize: Nil stream" if stream.nil?
  #
  # The stream should be pointing at the Allocation Group to be built on the disk.
  #
  @stream = stream

  @agf                    = AG_FREESPACE.decode(@stream.read(AG_FREESPACE_SIZE))
  @stream.seek(AG_FREESPACE_SIZE, IO::SEEK_CUR)
  @agi                    = AG_INODEINFO.decode(@stream.read(AG_INODEINFO_SIZE))
  @stream.seek(AG_INODEINFO_SIZE, IO::SEEK_CUR)
  @agfl                   = AG_FREELIST.decode(@stream.read(AG_FREELIST_SIZE))
  @stream.seek(-(AG_FREESPACE_SIZE + AG_INODEINFO_SIZE + AG_FREELIST_SIZE))
  @allocation_group_block = @stream.read(sb['block_size'])

  # Grab some quick facts & make sure there's nothing wrong. Tight qualification.
  if @agf['magic_num'] != XFS_AGF_MAGIC
    raise "XFS::AllocationGroup.initialize: Invalid AGF magic number=[#{@agf['magic_num']}]"
  elsif @agi['magic_num'] != XFS_AGI_MAGIC
    raise "XFS::AllocationGroup.initialize: Invalid AGI magic number=[#{@agi['magic_num']}]"
  elsif @agfl['magic_num'] != XFS_AGFL_MAGIC
    raise "XFS::AllocationGroup.initialize: Invalid AGFL magic number=[#{@agfl['magic_num']}]"
  end
end

Instance Attribute Details

#agf ⇒ Object (readonly)

///////////////////////////////////////////////////////////////////////// // initialize



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# File 'lib/fs/xfs/allocation_group.rb', line 103

def agf
  @agf
end

#agfl ⇒ Object (readonly)

///////////////////////////////////////////////////////////////////////// // initialize



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# File 'lib/fs/xfs/allocation_group.rb', line 103

def agfl
  @agfl
end

#agi ⇒ Object (readonly)

///////////////////////////////////////////////////////////////////////// // initialize



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# File 'lib/fs/xfs/allocation_group.rb', line 103

def agi
  @agi
end

#allocation_group_block ⇒ Object (readonly)

///////////////////////////////////////////////////////////////////////// // initialize



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# File 'lib/fs/xfs/allocation_group.rb', line 103

def allocation_group_block
  @allocation_group_block
end

#stream ⇒ Object (readonly)

///////////////////////////////////////////////////////////////////////// // initialize



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# File 'lib/fs/xfs/allocation_group.rb', line 103

def stream
  @stream
end

Instance Method Details

#dump ⇒ Object

Dump object.



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# File 'lib/fs/xfs/allocation_group.rb', line 134

def dump
  out = "\#<#{self.class}:0x#{format('%08x', object_id)}>\n"
  out << "AGI Magic number        : #{@agf['magic_num']}\n"
  out << "Version number          : #{@agf['version_num']})\n"
  out << "Sequence Number         : #{@agf['seq_no']}\n"
  out << "Length                  : #{@agf['length']}\n"
  out << "Root Blocks             : #{@agf['root_blocks']}\n"
  out << "Btree Levels            : #{@agf['btree_levels']}\n"
  out << "1st Freelist Blk Index  : #{@agf['fl_first']}\n"
  out << "Last Freelist Blk Index : #{@agf['fl_last']}\n"
  out << "# Blocks in Freelist    : #{@agf['fl_count']}\n"
  out << "# of Free Blocks        : #{@agf['free_blocks']}\n"
  out << "Longest Free Space      : #{@agf['longest']}\n"
  out << "# Blks in AG Free Btree : #{@agf['btree_blocks']}\n"
  out << "Filesystem UUID         : #{@agf['uuid']}\n"
  out << "Allocated Inodes        : #{@agi['count']}\n"
  out << "Root of Inode BTree     : #{@agi['root']}\n"
  out << "Levels in Inode BTree   : #{@agi['level']}\n"
  out << "Number of Free Inodes   : #{@agi['free_count']}\n"
  out << "Newest Inode Allocated  : #{@agi['new_inode']}\n"
  out << "Last Dir Inode Chunk    : #{@agi['dir_inode']}\n"
  out << "Root of Free Ino Btree  : #{@agi['free_root']}\n"
  out << "Levels in Free Ino Btree : #{@agi['free_level']}\n"
  out
end