mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 12:30:32 +00:00
283 lines
No EOL
8.4 KiB
C#
283 lines
No EOL
8.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Runtime.InteropServices;
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namespace Cosmos.Kernel.FileSystem {
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partial class Ext2Old {
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[StructLayout(LayoutKind.Sequential)]
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internal struct SuperBlock {
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/// <summary>
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/// Indicates the total number of INodes, both used and free, in the filesystem.
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/// </summary>
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public uint INodesCount;
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/// <summary>
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/// Indicates the total number of blocks, both used and free, in the filesystem.
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/// </summary>
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public uint BlockCount;
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/// <summary>
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/// Indicates the total number of blocks reserved for the usage of the super user. this is most useful
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/// if for some reason a user, malicious or not, fills the file system to capacity; the super user will
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/// have this specified amount of free blocks at his disposal so he can edit and save configuration files.
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/// </summary>
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public uint RBlocksCount;
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/// <summary>
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/// Indicates the total number of free blocks, including the number of reserved blocks (<see cref="RBlocksCount"/>).
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/// This is a sum of all free blocks of all the block groups.
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/// </summary>
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public uint FreeBlocksCount;
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/// <summary>
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/// Indicates the total number of free INodes. This is a sum of all free nodes of all the block groups.
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/// </summary>
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public uint FreeINodesCount;
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/// <summary>
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/// Identifies the first data block, in other words the id of the block containing the superblock
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/// structure.
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/// Note that this value is always 0 for filesystems with a block size larger than 1KB,
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/// and always 1 for filesystem with a blocksize of 1KB. The superblock is always starting at the
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/// 1024th byte of the disk, which normally happens to be the first byte of the 3rd sector.
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/// </summary>
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public uint FirstDataBlock;
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/// <summary>
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/// The block size is computed using this value as the number of bits to shift left the value 1024.
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/// This value may only be positive.
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/// <code>
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/// int xBlockSize = 1024 << LogBlockSize;
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/// </code>
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/// </summary>
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public int LogBlockSize;
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public uint LogFragSize;
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public uint BlocksPerGroup;
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public uint FragsPerGroup;
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public uint INodesPerGroup;
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public uint MTime;
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public uint WTime;
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public ushort MntCount;
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public ushort MaxMntCount;
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public ushort Magic;
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public ushort State;
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public ushort Errors;
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public ushort MinorRevLevel;
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public uint LastCheck;
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public uint CheckInterval;
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public uint CreatorOS;
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public uint RevLevel;
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public ushort RefResUID;
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// up to byte 84 (includes 83..)
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public ushort DefResGID;
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public uint Padding1;
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public uint Padding2;
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public uint Padding3;
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public uint Padding4;
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public uint Padding5;
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public uint Padding6;
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public uint Padding7;
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public uint Padding8;
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public uint Padding9;
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public uint Padding10;
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public uint Padding11;
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public uint Padding12;
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public uint Padding13;
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public uint Padding14;
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public uint Padding15;
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public uint Padding16;
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public uint Padding17;
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public uint Padding18;
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public uint Padding19;
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public uint Padding20;
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public uint Padding21;
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public uint Padding22;
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public uint Padding23;
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public uint Padding24;
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public uint Padding25;
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public uint Padding26;
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public uint Padding27;
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public uint Padding28;
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public uint Padding29;
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public uint Padding30;
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public uint Padding31;
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public uint Padding32;
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public uint Padding33;
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public uint Padding34;
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public uint Padding35;
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public uint Padding36;
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public uint Padding37;
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public uint Padding38;
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public uint Padding39;
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public uint Padding40;
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public uint Padding41;
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public uint Padding42;
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public uint Padding43;
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public uint Padding44;
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public uint Padding45;
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public uint Padding46;
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public uint Padding47;
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public uint Padding48;
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public uint Padding49;
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public uint Padding50;
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public uint Padding51;
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public uint Padding52;
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public uint Padding53;
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public uint Padding54;
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public uint Padding55;
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public uint Padding56;
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public uint Padding57;
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public uint Padding58;
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public uint Padding59;
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public uint Padding60;
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public uint Padding61;
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public uint Padding62;
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public uint Padding63;
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public uint Padding64;
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public uint Padding65;
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public uint Padding66;
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public uint Padding67;
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public uint Padding68;
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public uint Padding69;
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public uint Padding70;
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public uint Padding71;
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public uint Padding72;
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public uint Padding73;
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public uint Padding74;
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public uint Padding75;
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public uint Padding76;
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public uint Padding77;
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public uint Padding78;
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public uint Padding79;
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public uint Padding80;
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public uint Padding81;
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public uint Padding82;
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public uint Padding83;
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public uint Padding84;
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public uint Padding85;
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public uint Padding86;
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public uint Padding87;
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public uint Padding88;
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public uint Padding89;
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public uint Padding90;
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public uint Padding91;
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public uint Padding92;
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public uint Padding93;
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public uint Padding94;
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public uint Padding95;
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public uint Padding96;
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public uint Padding97;
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public uint Padding98;
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public uint Padding99;
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public uint Padding100;
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public uint Padding101;
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public uint Padding102;
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public uint Padding103;
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public uint Padding104;
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public uint Padding105;
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public uint Padding106;
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public uint Padding107;
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}
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/// <summary>
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/// For each group in the filesystem, a <see cref="GroupDescriptor"/> is created.
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/// Each represents a single "block group" within the filesystem and the information
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/// within any on of them is pertinent only to the group it is describing.
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/// </summary>
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[StructLayout(LayoutKind.Sequential)]
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internal struct GroupDescriptor {
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/// <summary>
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/// Block id of the first block of the "block bitmap" for the group represented.
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/// </summary>
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public uint BlockBitmap;
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/// <summary>
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/// Block id of the first block of the "INode bitmap" for the group represented.
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/// </summary>
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public uint INodeBitmap;
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/// <summary>
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/// Block id of the first block of the "INode table" for the group represented.
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/// </summary>
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public uint INodeTable;
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public ushort FreeBlocksCount;
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public ushort FreeINodesCount;
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public ushort UsedDirsCount;
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public ushort Pad;
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public uint Padding1;
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public uint Padding2;
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public uint Padding3;
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}
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[StructLayout(LayoutKind.Sequential)]
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internal struct INode {
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public INodeModeEnum Mode;
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public ushort UID;
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public uint Size;
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public uint ATime;
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public uint CTime;
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public uint MTime;
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public uint DTime;
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public ushort GID;
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public ushort LinksCount;
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public uint Blocks;
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public uint Flags;
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public uint OSD1;
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public uint Block1;
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public uint Block2;
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public uint Block3;
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public uint Block4;
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public uint Block5;
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public uint Block6;
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public uint Block7;
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public uint Block8;
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public uint Block9;
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public uint Block10;
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public uint Block11;
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public uint Block12;
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public uint Block13;
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public uint Block14;
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public uint Block15;
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public uint Generation;
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public uint FileACL;
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public uint DirACL;
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public uint FAddr;
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public uint OSD2_1;
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public uint OSD2_2;
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public uint OSD2_3;
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}
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[Flags]
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public enum INodeModeEnum: ushort {
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FormatMask = 0xF000,
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Socket = 0xC000,
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SymbolicLink = 0xA000,
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RegularFile = 0x8000,
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BlockDevice = 0x6000,
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Directory = 0x4000,
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CharacterDevice = 0x2000,
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Fifo = 0x1000,
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SUID = 0x0800,
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SGID = 0x0400,
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StickyBit = 0x0200,
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UserAccessRightsMask = 0x01C0,
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UserAccessRightsRead = 0x0100,
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UserAccessRightsWrite = 0x0080,
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UserAccessRightsExecute = 0x0040,
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GroupAccessRightsMask = 0x0038,
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GroupAccessRightsRead = 0x0020,
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GroupAccessRightsWrite = 0x0010,
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GroupAccessRightsExecute = 0x0008,
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OthersAccessRightsMask = 0x0007,
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OthersAccessRightsRead = 0x0004,
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OthersAccessRightsWrite = 0x0002,
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OthersAccessRightsExecute = 0x0001
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}
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[StructLayout(LayoutKind.Sequential)]
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internal struct DirectoryEntry {
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/// <summary>
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/// INode number of the entry. A value of <c>0</c> indicates that the entry is not used.
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/// </summary>
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public uint INode;
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public ushort RecordLength;
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public byte NameLength;
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public byte FileType;
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public byte FirstNameChar;
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}
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}
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} |