Nucleus

diff --git a/vfs/ext2fs/ext2fs.h b/vfs/ext2fs/ext2fs.h
new file mode 100644
index 0000000..7d60d62
--- /dev/null
+++ b/vfs/ext2fs/ext2fs.h
@@ -0,0 +1,107 @@
+#ifndef VFS_EXT2FS_H
+#define VFS_EXT2FS_H
+
+/* Structure of the ext2 superblock */
+struct Ext2Super {
+	uint32_t numInodes;
+	uint32_t numBlocks;
+	uint32_t reservedBlocks;
+	uint32_t unallocBlocks;
+	uint32_t unallocInodes;
+	uint32_t superBlock;
+	uint32_t blockSize;
+	uint32_t fragSize;
+	uint32_t blocksPerGroup;
+	uint32_t fragsPerGroup;
+	uint32_t inodesPerGroup;
+	uint32_t lastMountTime;
+	uint32_t lastWriteTime;
+	uint16_t lastCheck;
+	uint16_t mustCheck;
+	uint16_t signature;
+	uint16_t state;
+	uint16_t error;
+	uint16_t verMinor;
+	uint32_t lastCheckTime;
+	uint32_t checkInterval;
+	uint32_t creator;
+	uint32_t verMajor;
+	uint16_t uid, gid;
+	/* Extended fields */
+	uint32_t firstAvailInode;
+	uint16_t inodeSize;
+	uint16_t blockGroup;
+	uint32_t optionalFeatures;
+	uint32_t requiredFeatures;
+	uint32_t writableFeatures;
+	char fsId[16];
+	char volumeName[16];
+	char lastPath[64];
+	uint32_t compression;
+	uint8_t preallocFileBlocks;
+	uint8_t preallocDirBlocks;
+	uint16_t unused;
+	char journalId[16];
+	uint32_t journalInode;
+	uint32_t journalDev;
+	uint32_t orphanHead;
+} __attribute__((packed));
+
+/* Structure of the ext2 block group descriptor */
+struct Ext2BlockGroupDesc {
+	uint32_t blockUsage;
+	uint32_t inodeUsage;
+	uint32_t inodeTable;
+	uint16_t unallocBlocks;
+	uint16_t unallocInodes;
+	uint16_t numDirs;
+} __attribute__((packed));
+
+/* Structure of the ext2 inode */
+struct Ext2Inode {
+	uint16_t type;
+	uint16_t uid;
+	uint32_t lsize;
+	uint32_t lastAccessTime;
+	uint32_t creationTime;
+	uint32_t lastWriteTime;
+	uint32_t deletionTime;
+	uint16_t gid;
+	uint16_t numHardLinks;
+	uint32_t numSectors;
+	uint32_t flags;
+	uint32_t osA;
+	uint32_t directBlock[12];
+	uint32_t singleBlock;
+	uint32_t doubleBlock;
+	uint32_t tripleBlock;
+	uint32_t gen;
+	uint32_t attr;
+	union {
+		uint32_t usize;
+		uint32_t dirACL;
+	};
+	uint32_t fragment;
+	uint32_t osB[3];
+} __attribute__((packed));
+
+/* Structure of the ext2 directory entry */
+struct Ext2DirEntry {
+	uint32_t ino;
+	uint16_t size;
+	uint8_t namelen;
+	uint8_t type;
+	char name[];
+} __attribute__((packed));
+
+extern SuperOps ext2fsSuperOps;
+extern InodeOps ext2fsInodeOps;
+extern FileOps ext2fsFileOps;
+
+void ext2fs_read_inode(SuperBlock *sb, uint32_t index, struct Ext2Inode *res);
+void ext2fs_read_vnode(SuperBlock *sb, uint32_t index, Inode *res);
+void ext2fs_read_block(SuperBlock *super, uint32_t index, char *buf);
+uint32_t ext2fs_get_data_addr(SuperBlock *super, struct Ext2Inode *inode,
+                              uint32_t index);
+
+#endif