/* MODIFIED by Karen Reid for CSC369 * to remove some of the unnecessary components */ /* MODIFIED by Tian Ze Chen for CSC369 * to clean up the code and fix some bugs */ /* * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/include/linux/minix_fs.h * * Copyright (C) 1991, 1992 Linus Torvalds */ #ifndef CSC369A3_EXT2_FS_H #define CSC369A3_EXT2_FS_H #define EXT2_BLOCK_SIZE 1024 /* * Structure of the super block */ struct ext2_super_block { unsigned int s_inodes_count; /* Inodes count */ unsigned int s_blocks_count; /* Blocks count */ unsigned int s_r_blocks_count; /* Reserved blocks count */ unsigned int s_free_blocks_count; /* Free blocks count */ unsigned int s_free_inodes_count; /* Free inodes count */ unsigned int s_first_data_block; /* First Data Block */ unsigned int s_log_block_size; /* Block size */ unsigned int s_log_frag_size; /* Fragment size */ unsigned int s_blocks_per_group; /* # Blocks per group */ unsigned int s_frags_per_group; /* # Fragments per group */ unsigned int s_inodes_per_group; /* # Inodes per group */ unsigned int s_mtime; /* Mount time */ unsigned int s_wtime; /* Write time */ unsigned short s_mnt_count; /* Mount count */ unsigned short s_max_mnt_count; /* Maximal mount count */ unsigned short s_magic; /* Magic signature */ unsigned short s_state; /* File system state */ unsigned short s_errors; /* Behaviour when detecting errors */ unsigned short s_minor_rev_level; /* minor revision level */ unsigned int s_lastcheck; /* time of last check */ unsigned int s_checkinterval; /* max. time between checks */ unsigned int s_creator_os; /* OS */ unsigned int s_rev_level; /* Revision level */ unsigned short s_def_resuid; /* Default uid for reserved blocks */ unsigned short s_def_resgid; /* Default gid for reserved blocks */ /* * These fields are for EXT2_DYNAMIC_REV superblocks only. * * Note: the difference between the compatible feature set and * the incompatible feature set is that if there is a bit set * in the incompatible feature set that the kernel doesn't * know about, it should refuse to mount the filesystem. * * e2fsck's requirements are more strict; if it doesn't know * about a feature in either the compatible or incompatible * feature set, it must abort and not try to meddle with * things it doesn't understand... */ unsigned int s_first_ino; /* First non-reserved inode */ unsigned short s_inode_size; /* size of inode structure */ unsigned short s_block_group_nr; /* block group # of this superblock */ unsigned int s_feature_compat; /* compatible feature set */ unsigned int s_feature_incompat; /* incompatible feature set */ unsigned int s_feature_ro_compat; /* readonly-compatible feature set */ unsigned char s_uuid[16]; /* 128-bit uuid for volume */ char s_volume_name[16]; /* volume name */ char s_last_mounted[64]; /* directory where last mounted */ unsigned int s_algorithm_usage_bitmap; /* For compression */ /* * Performance hints. Directory preallocation should only * happen if the EXT2_COMPAT_PREALLOC flag is on. */ unsigned char s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ unsigned char s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ unsigned short s_padding1; /* * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. */ unsigned char s_journal_uuid[16]; /* uuid of journal superblock */ unsigned int s_journal_inum; /* inode number of journal file */ unsigned int s_journal_dev; /* device number of journal file */ unsigned int s_last_orphan; /* start of list of inodes to delete */ unsigned int s_hash_seed[4]; /* HTREE hash seed */ unsigned char s_def_hash_version; /* Default hash version to use */ unsigned char s_reserved_char_pad; unsigned short s_reserved_word_pad; unsigned int s_default_mount_opts; unsigned int s_first_meta_bg; /* First metablock block group */ unsigned int s_reserved[190]; /* Padding to the end of the block */ }; /* * Structure of a blocks group descriptor */ struct ext2_group_desc { unsigned int bg_block_bitmap; /* Blocks bitmap block */ unsigned int bg_inode_bitmap; /* Inodes bitmap block */ unsigned int bg_inode_table; /* Inodes table block */ unsigned short bg_free_blocks_count; /* Free blocks count */ unsigned short bg_free_inodes_count; /* Free inodes count */ unsigned short bg_used_dirs_count; /* Directories count */ unsigned short bg_pad; unsigned int bg_reserved[3]; }; /* * Structure of an inode on the disk */ struct ext2_inode { unsigned short i_mode; /* File mode */ unsigned short i_uid; /* Low 16 bits of Owner Uid */ unsigned int i_size; /* Size in bytes */ unsigned int i_atime; /* Access time */ unsigned int i_ctime; /* Creation time */ unsigned int i_mtime; /* Modification time */ unsigned int i_dtime; /* Deletion Time */ unsigned short i_gid; /* Low 16 bits of Group Id */ unsigned short i_links_count; /* Links count */ unsigned int i_blocks; /* Blocks count IN DISK SECTORS*/ unsigned int i_flags; /* File flags */ unsigned int osd1; /* OS dependent 1 */ unsigned int i_block[15]; /* Pointers to blocks */ unsigned int i_generation; /* File version (for NFS) */ unsigned int i_file_acl; /* File ACL */ unsigned int i_dir_acl; /* Directory ACL */ unsigned int i_faddr; /* Fragment address */ unsigned int extra[3]; }; /* * Type field for file mode */ /* #define EXT2_S_IFSOCK 0xC000 */ /* socket */ #define EXT2_S_IFLNK 0xA000 /* symbolic link */ #define EXT2_S_IFREG 0x8000 /* regular file */ /* #define EXT2_S_IFBLK 0x6000 */ /* block device */ #define EXT2_S_IFDIR 0x4000 /* directory */ /* #define EXT2_S_IFCHR 0x2000 */ /* character device */ /* #define EXT2_S_IFIFO 0x1000 */ /* fifo */ /* * Special inode numbers */ /* #define EXT2_BAD_INO 1 */ /* Bad blocks inode */ #define EXT2_ROOT_INO 2 /* Root inode */ /* #define EXT4_USR_QUOTA_INO 3 */ /* User quota inode */ /* #define EXT4_GRP_QUOTA_INO 4 */ /* Group quota inode */ /* #define EXT2_BOOT_LOADER_INO 5 */ /* Boot loader inode */ /* #define EXT2_UNDEL_DIR_INO 6 */ /* Undelete directory inode */ /* #define EXT2_RESIZE_INO 7 */ /* Reserved group descriptors inode */ /* #define EXT2_JOURNAL_INO 8 */ /* Journal inode */ /* #define EXT2_EXCLUDE_INO 9 */ /* The "exclude" inode, for snapshots */ /* #define EXT4_REPLICA_INO 10 */ /* Used by non-upstream feature */ /* First non-reserved inode for old ext2 filesystems */ #define EXT2_GOOD_OLD_FIRST_INO 11 /* * Structure of a directory entry */ #define EXT2_NAME_LEN 255 /* WARNING: DO NOT use this struct, ext2_dir_entry_2 is the * one to use for the assignement */ struct ext2_dir_entry { unsigned int inode; /* Inode number */ unsigned short rec_len; /* Directory entry length */ unsigned short name_len; /* Name length */ char name[]; /* File name, up to EXT2_NAME_LEN */ }; /* * The new version of the directory entry. Since EXT2 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the * file_type field. */ struct ext2_dir_entry_2 { unsigned int inode; /* Inode number */ unsigned short rec_len; /* Directory entry length */ unsigned char name_len; /* Name length */ unsigned char file_type; char name[]; /* File name, up to EXT2_NAME_LEN */ }; /* * Ext2 directory file types. Only the low 3 bits are used. The * other bits are reserved for now. */ #define EXT2_FT_UNKNOWN 0 /* Unknown File Type */ #define EXT2_FT_REG_FILE 1 /* Regular File */ #define EXT2_FT_DIR 2 /* Directory File */ /* #define EXT2_FT_CHRDEV 3 */ /* Character Device */ /* #define EXT2_FT_BLKDEV 4 */ /* Block Device */ /* #define EXT2_FT_FIFO 5 */ /* Buffer File */ /* #define EXT2_FT_SOCK 6 */ /* Socket File */ #define EXT2_FT_SYMLINK 7 /* Symbolic Link */ #define EXT2_FT_MAX 8 #endif