internal static bool Detect(Stream stream)
{
if (stream.Length < 264)
{
return(false);
}
stream.Position = 0;
byte[] superblockData = StreamUtilities.ReadFully(stream, 264);
SuperBlock superblock = new SuperBlock();
superblock.ReadFrom(superblockData, 0);
return(superblock.Magic == SuperBlock.XfsMagic);
}
public AllocationGroupFreeBlockInfo(SuperBlock superBlock)
{
SbVersion = superBlock.SbVersion;
Size = SbVersion >= 5 ? 92 : 64;
}
public BlockDirectory(SuperBlock sb)
{
SuperBlock = sb;
sb_ok = true;
}
/// <summary>
/// https://github.com/torvalds/linux/blob/2a610b8aa8e5bd449ba270e517b0e72295d62c9c/fs/xfs/libxfs/xfs_format.h#L587
/// </summary>
private long XFS_FSB_TO_BB(SuperBlock sb, long fsbno)
{
return(fsbno << (sb.BlocksizeLog2 - BBSHIFT));
}
/// <summary>
/// https://github.com/torvalds/linux/blob/2a610b8aa8e5bd449ba270e517b0e72295d62c9c/fs/xfs/libxfs/xfs_format.h#L716
/// </summary>
private long XFS_AGF_DADDR(SuperBlock sb)
{
return(1 << (sb.SectorSizeLog2 - BBSHIFT));
}
/// <summary>
/// https://github.com/torvalds/linux/blob/2a610b8aa8e5bd449ba270e517b0e72295d62c9c/fs/xfs/libxfs/xfs_format.h#L829
/// </summary>
private long XFS_AGB_TO_DADDR(SuperBlock sb, int agno, int agbno)
{
return(XFS_FSB_TO_BB(sb, agno * sb.AgBlocks) + agbno);
}
/// <summary>
/// https://github.com/torvalds/linux/blob/2a610b8aa8e5bd449ba270e517b0e72295d62c9c/fs/xfs/libxfs/xfs_format.h#L832
/// </summary>
private long XFS_AG_DADDR(SuperBlock sb, int agno, long d)
{
return(XFS_AGB_TO_DADDR(sb, agno, 0) + d);
}
public AllocationGroupInodeBtreeInfo(SuperBlock superBlock)
{
SbVersion = superBlock.SbVersion;
Size = SbVersion >= 5 ? 334 : 296;
}
public LeafDirectory(SuperBlock sb)
{
superblock = sb;
}
public BlockDirectoryDataUnused(SuperBlock sb)
{
SuperBlock = sb;
sb_ok = true;
}
