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215
Aaru.Filesystems/UNICOS.cs
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215
Aaru.Filesystems/UNICOS.cs
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// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : UNICOS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : UNICOS filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the UNICOS filesystem and shows information.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2020 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Console;
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using Schemas;
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// UNICOS is ILP64 so let's think everything is 64-bit
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using blkno_t = System.Int64;
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using daddr_t = System.Int64;
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using dev_t = System.Int64;
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using extent_t = System.Int64;
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using ino_t = System.Int64;
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using Marshal = DiscImageChef.Helpers.Marshal;
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using time_t = System.Int64;
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namespace DiscImageChef.Filesystems
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{
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public class UNICOS : IFilesystem
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{
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const int NC1_MAXPART = 64;
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const int NC1_MAXIREG = 4;
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const ulong UNICOS_MAGIC = 0x6e6331667331636e;
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const ulong UNICOS_SECURE = 0xcd076d1771d670cd;
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public FileSystemType XmlFsType { get; private set; }
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public Encoding Encoding { get; private set; }
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public string Name => "UNICOS Filesystem Plugin";
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public Guid Id => new Guid("61712F04-066C-44D5-A2A0-1E44C66B33F0");
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public string Author => "Natalia Portillo";
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(imagePlugin.Info.SectorSize < 512) return false;
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uint sbSize = (uint)(Marshal.SizeOf<UNICOS_Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<UNICOS_Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<UNICOS_Superblock>()) return false;
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UNICOS_Superblock unicosSb = Marshal.ByteArrayToStructureBigEndian<UNICOS_Superblock>(sector);
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DicConsole.DebugWriteLine("UNICOS plugin", "magic = 0x{0:X16} (expected 0x{1:X16})", unicosSb.s_magic,
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UNICOS_MAGIC);
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return unicosSb.s_magic == UNICOS_MAGIC;
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}
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public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information,
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Encoding encoding)
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{
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Encoding = encoding ?? Encoding.GetEncoding("iso-8859-15");
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information = "";
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if(imagePlugin.Info.SectorSize < 512) return;
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uint sbSize = (uint)(Marshal.SizeOf<UNICOS_Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<UNICOS_Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<UNICOS_Superblock>()) return;
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UNICOS_Superblock unicosSb = Marshal.ByteArrayToStructureBigEndian<UNICOS_Superblock>(sector);
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if(unicosSb.s_magic != UNICOS_MAGIC) return;
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("UNICOS filesystem");
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if(unicosSb.s_secure == UNICOS_SECURE) sb.AppendLine("Volume is secure");
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sb.AppendFormat("Volume contains {0} partitions", unicosSb.s_npart).AppendLine();
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sb.AppendFormat("{0} bytes per sector", unicosSb.s_iounit).AppendLine();
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sb.AppendLine("4096 bytes per block");
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sb.AppendFormat("{0} data blocks in volume", unicosSb.s_fsize).AppendLine();
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sb.AppendFormat("Root resides on inode {0}", unicosSb.s_root).AppendLine();
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sb.AppendFormat("{0} inodes in volume", unicosSb.s_isize).AppendLine();
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sb.AppendFormat("Volume last updated on {0}", DateHandlers.UnixToDateTime(unicosSb.s_time)).AppendLine();
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if(unicosSb.s_error > 0)
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sb.AppendFormat("Volume is dirty, error code = 0x{0:X16}", unicosSb.s_error).AppendLine();
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(unicosSb.s_fname, Encoding)).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "UNICOS filesystem",
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ClusterSize = 4096,
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Clusters = (ulong)unicosSb.s_fsize,
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VolumeName = StringHandlers.CToString(unicosSb.s_fname, Encoding),
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ModificationDate = DateHandlers.UnixToDateTime(unicosSb.s_time),
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ModificationDateSpecified = true
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};
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XmlFsType.Dirty |= unicosSb.s_error > 0;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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struct nc1ireg_sb
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{
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public readonly ushort i_unused; /* reserved */
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public readonly ushort i_nblk; /* number of blocks */
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public readonly uint i_sblk; /* start block number */
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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struct nc1fdev_sb
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{
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public readonly long fd_name; /* Physical device name */
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public readonly uint fd_sblk; /* Start block number */
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public readonly uint fd_nblk; /* Number of blocks */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = NC1_MAXIREG)]
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public readonly nc1ireg_sb[] fd_ireg; /* Inode regions */
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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struct UNICOS_Superblock
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{
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public readonly ulong s_magic; /* magic number to indicate file system type */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
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public readonly byte[] s_fname; /* file system name */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
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public readonly byte[] s_fpack; /* file system pack name */
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public readonly dev_t s_dev; /* major/minor device, for verification */
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public readonly daddr_t s_fsize; /* size in blocks of entire volume */
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public readonly long s_isize; /* Number of total inodes */
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public readonly long s_bigfile; /* number of bytes at which a file is big */
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public readonly long s_bigunit; /* minimum number of blocks allocated for big files */
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public readonly ulong s_secure; /* security: secure FS label */
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public readonly long s_maxlvl; /* security: maximum security level */
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public readonly long s_minlvl; /* security: minimum security level */
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public readonly long s_valcmp; /* security: valid security compartments */
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public readonly time_t s_time; /* last super block update */
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public readonly blkno_t s_dboff; /* Dynamic block number */
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public readonly ino_t s_root; /* root inode */
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public readonly long s_error; /* Type of file system error detected */
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public readonly blkno_t s_mapoff; /* Start map block number */
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public readonly long s_mapblks; /* Last map block number */
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public readonly long s_nscpys; /* Number of copies of s.b per partition */
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public readonly long s_npart; /* Number of partitions */
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public readonly long s_ifract; /* Ratio of inodes to blocks */
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public readonly extent_t s_sfs; /* SFS only blocks */
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public readonly long s_flag; /* Flag word */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = NC1_MAXPART)]
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public readonly nc1fdev_sb[] s_part; /* Partition descriptors */
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public readonly long s_iounit; /* Physical block size */
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public readonly long s_numiresblks; /* number of inode reservation blocks */
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/* per region (currently 1) */
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/* 0 = 1*(AU) words, n = (n+1)*(AU) words */
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public readonly long s_priparts; /* bitmap of primary partitions */
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public readonly long s_priblock; /* block size of primary partition(s) */
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/* 0 = 1*512 words, n = (n+1)*512 words */
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public readonly long s_prinblks; /* number of 512 wds blocks in primary */
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public readonly long s_secparts; /* bitmap of secondary partitions */
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public readonly long s_secblock; /* block size of secondary partition(s) */
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/* 0 = 1*512 words, n = (n+1)*512 words */
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public readonly long s_secnblks; /* number of 512 wds blocks in secondary */
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public readonly long s_sbdbparts; /* bitmap of partitions with file system data */
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/* including super blocks, dynamic block */
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/* and free block bitmaps (only primary */
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/* partitions may contain these) */
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public readonly long s_rootdparts; /* bitmap of partitions with root directory */
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/* (only primary partitions) */
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public readonly long s_nudparts; /* bitmap of no-user-data partitions */
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/* (only primary partitions) */
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public readonly long s_nsema; /* SFS: # fs semaphores to allocate */
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public readonly long s_priactive; /* bitmap of primary partitions which contain */
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/* active (up to date) dynamic blocks and */
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/* free block bitmaps. All bits set indicate */
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/* that all primary partitions are active, */
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/* and no kernel manipulation of active flag */
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/* is allowed. */
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public readonly long s_sfs_arbiterid; /* SFS Arbiter ID */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 91)]
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public readonly long[] s_fill; /* reserved */
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}
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}
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}
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