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/*
* 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
*/
/* MODIFIED by Bogdan Simion, Tian Ze Chen, and Karen Reid for CSC369
* to remove unnecessary components for the assignment, clean up the code
* and fix some bugs */
#ifndef CSC369_EXT2_FS_H
#define CSC369_EXT2_FS_H
/* The ext2 block size used in the assignment. */
#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 */
/* Reserved blocks count is not used in the assignment. */
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 */
/******************************************************************
* The rest of the ext2 superblock structure is irrelevent to the
* assignment, but is included below, for completeness.
******************************************************************/
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 */
/* The pad and reserved fields should be 0 for the assignment. */
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 */
/* Use 0 as the user id for the assignment. */
unsigned short i_uid; /* Low 16 bits of Owner Uid */
unsigned int i_size; /* Size in bytes */
/* You don't need to set access time for the assignment. */
unsigned int i_atime; /* Access time */
unsigned int i_ctime; /* Creation time */
/* You don't need to set modification time for the assignment. */
unsigned int i_mtime; /* Modification time */
/* d_time must be set when appropriate */
unsigned int i_dtime; /* Deletion Time */
/* Use 0 as the group id for the assignment. */
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*/
/* You can ignore flags for the assignment. */
unsigned int i_flags; /* File flags */
/* You should set it to 0. */
unsigned int osd1; /* OS dependent 1 */
unsigned int i_block[15]; /* Pointers to blocks */
/* You should use generation number 0 for the assignment. */
unsigned int i_generation; /* File version (for NFS) */
/* The following fields should be 0 for the assignment. */
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_IFLNK 0xA000 /* symbolic link */
#define EXT2_S_IFREG 0x8000 /* regular file */
#define EXT2_S_IFDIR 0x4000 /* directory */
/* Other types, irrelevant for the assignment */
/* #define EXT2_S_IFSOCK 0xC000 */ /* socket */
/* #define EXT2_S_IFBLK 0x6000 */ /* block device */
/* #define EXT2_S_IFCHR 0x2000 */ /* character device */
/* #define EXT2_S_IFIFO 0x1000 */ /* fifo */
/*
* Special inode numbers
*/
/* Root inode */
#define EXT2_ROOT_INO 2
/* 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
/*
* 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 {
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_SYMLINK 7 /* Symbolic Link */
/* Other types, irrelevant for the assignment */
/* #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_MAX 8
#endif
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