+++ /dev/null
-/*
- *--------------------------------------------------------------------------
- * File Name: ext2.h
- *
- * Description: 当然.几乎来自Linux 内核.
- *
- *
- * Author: Zhao Yanbai [zhaoyanbai@126.com]
- *
- * Version: 1.0
- * Create Date: Fri Dec 26 22:43:43 2008
- * Last Update: Fri Dec 26 22:43:43 2008
- *
- *--------------------------------------------------------------------------
- */
-
-#ifndef _EXT2_H
-#define _EXT2_H
-
-#include <types.h>
-
-#define EXT2_BAD_INO 1
-#define EXT2_ROOT_INO 2
-#define EXT2_BOOT_LOADER_INO 5
-#define EXT2_UNDEL_DIR_INO 6
-
-#define EXT2_MIN_BLOCK_SIZE 1024
-#define EXT2_MAX_BLOCK_SIZE 4096
-#define EXT2_MIN_BLOCK_LOG_SIZE 10
-
-#define EXT2_SB (&ext2_sb)
-#define EXT2_SECT (ext2_start_sect)
-
-#ifndef EXT2_SB
-#error "Please define EXT2_SB"
-#endif
-
-#define EXT2_BLOCK_SIZE (EXT2_MIN_BLOCK_SIZE << (EXT2_SB)->s_log_block_size)
-
-#define EXT2_SECT_PER_BLOCK (EXT2_BLOCK_SIZE / 512)
-
-#define EXT2_BLOCK_SIZE_BITS ((EXT2_SB)->s_log_block_size + 10)
-#define EXT2_INODE_SIZE ((EXT2_SB)->s_inode_size)
-#define EXT2_INODES_PER_BLOCK (EXT2_BLOCK_SIZE / EXT2_INODE_SIZE)
-#define EXT2_FIRST_INO ((EXT2_SB)->s_first_ino)
-/*
- * 表示第一个块号. 因为SuperBlock总是从第三个扇区开始的所以如果块的大小
- * 是1024的话SuperBlock的块号是1.而如果块的大小是2048或4096则SuperBlock
- * 的块号是0
- */
-#define EXT2_FIRST_BLOCK_ID (EXT2_BLOCK_SIZE == 1024)
-
-#define EXT2_BLOCKS_PER_GROUP ((EXT2_SB)->s_blocks_per_group)
-#define EXT2_DESC_PER_BLOCK ((EXT2_SB)->s_desc_per_block)
-#define EXT2_INODES_PER_GROUP ((EXT2_SB)->s_inodes_per_group)
-#define EXT2_INODES_COUNT ((EXT2_SB)->s_inodes_count)
-
-/*
- * ------------------------------------------------------------------------
- * EXT2 FILE SYSTEM PART
- * ------------------------------------------------------------------------
- */
-typedef struct ext2_superblock {
- /*
- u32 s_inodes_count;
- u32 s_blocks_count;
- u32 s_r_blocks_count;
- u32 s_free_blocks_count;
- u32 s_free_inodes_count;
- u32 s_first_data_block;
- u32 s_log_block_size;
- u32 s_log_frag_size;
- u32 s_blocks_per_group;
- u32 s_frags_per_group;
- u32 s_inodes_per_group;
-
- // So Much Items
- // I do not want to write down ...
-*/
- u32 s_inodes_count; /* Inodes count */
- u32 s_blocks_count; /* Blocks count */
- u32 s_r_blocks_count; /* Reserved blocks count */
- u32 s_free_blocks_count; /* Free blocks count */
- u32 s_free_inodes_count; /* Free inodes count */
- u32 s_first_data_block; /* First Data Block */
- u32 s_log_block_size; /* Block size */
- u32 s_log_frag_size; /* Fragment size */
- u32 s_blocks_per_group; /* # Blocks per group */
- u32 s_frags_per_group; /* # Fragments per group */
- u32 s_inodes_per_group; /* # Inodes per group */
- u32 s_mtime; /* Mount time */
- u32 s_wtime; /* Write time */
- u16 s_mnt_count; /* Mount count */
- u16 s_max_mnt_count; /* Maximal mount count */
- u16 s_magic; /* Magic signature */
- u16 s_state; /* File system state */
- u16 s_errors; /* Behaviour when detecting errors */
- u16 s_minor_rev_level; /* minor revision level */
- u32 s_lastcheck; /* time of last check */
- u32 s_checkinterval; /* max. time between checks */
- u32 s_creator_os; /* OS */
- u32 s_rev_level; /* Revision level */
- u16 s_def_resuid; /* Default uid for reserved blocks */
- u16 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...
- */
- u32 s_first_ino; /* First non-reserved inode */
- u16 s_inode_size; /* size of inode structure */
- u16 s_block_group_nr; /* block group # of this superblock */
- u32 s_feature_compat; /* compatible feature set */
- u32 s_feature_incompat; /* incompatible feature set */
- u32 s_feature_ro_compat; /* readonly-compatible feature set */
- u8 s_uuid[16]; /* 128-bit uuid for volume */
- char s_volume_name[16]; /* volume name */
- char s_last_mounted[64]; /* directory where last mounted */
- u32 s_algorithm_usage_bitmap; /* For compression */
- /*
- * Performance hints. Directory preallocation should only
- * happen if the EXT2_COMPAT_PREALLOC flag is on.
- */
- u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
- u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
- u16 s_padding1;
- /*
- * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
- */
- u8 s_journal_uuid[16]; /* uuid of journal superblock */
- u32 s_journal_inum; /* inode number of journal file */
- u32 s_journal_dev; /* device number of journal file */
- u32 s_last_orphan; /* start of list of inodes to delete */
- u32 s_hash_seed[4]; /* HTREE hash seed */
- u8 s_def_hash_version; /* Default hash version to use */
- u8 s_reserved_char_pad;
- u16 s_reserved_word_pad;
- u32 s_default_mount_opts;
- u32 s_first_meta_bg; /* First metablock block group */
- u32 s_reserved[190]; /* Padding to the end of the block */
-} SuperBlock, *pSuperBlock;
-
-extern SuperBlock ext2_sb;
-
-typedef struct ext2_group_descriptor {
- u32 bg_block_bitmap;
- u32 bg_inode_bitmap;
- u32 bg_inode_table;
- u16 bg_free_blocks_count;
- u16 bg_free_inodes_count;
- u16 bg_used_dirs_count;
- u16 bg_pad;
- u32 bg_reserved[3];
-} GroupDesc, *pGroupDesc;
-
-#define EXT2_NDIR_BLOCKS (12)
-#define EXT2_IND_BLOCK (EXT2_NDIR_BLOCKS)
-#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
-#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
-#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
-
-typedef struct ext2_inode {
- u16 i_mode;
- u16 i_uid;
- u32 i_size;
- u32 i_atime;
- u32 i_ctime;
- u32 i_mtime;
- u32 i_dtime;
- u16 i_gid;
- u16 i_links_count;
- u32 i_blocks;
- u32 i_flags;
- u32 i_osd1;
- u32 i_block[EXT2_N_BLOCKS];
- u32 i_generation;
- u32 i_file_acl;
- u32 i_dir_acl;
- u32 i_faddr;
- u8 i_osd2[12];
-} Inode, *pInode;
-
-#define EXT2_NAME_LEN 255
-typedef struct ext2_dir_ent {
- u32 inode;
- u16 rec_len;
- u8 name_len;
- u8 file_type; /* 目录类型 */
- char name[EXT2_NAME_LEN];
-} DirEnt, *pDirEnt;
-
-/*
- * Ext2 目录类型.
- * 到目前为止只有低3位有效.
- */
-enum {
- EXT2_FT_UNKNOWN,
- EXT2_FT_REG_FILE,
- EXT2_FT_DIR,
- EXT2_FT_CHRDEV,
- EXT2_FT_BLKDEV,
- EXT2_FT_FIFO,
- EXT2_FT_SOCK,
- EXT2_FT_SYMLINK,
- EXT2_FT_MAX
-};
-
-#define EXT2_DIR_PAD 4
-#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
-#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & ~EXT2_DIR_ROUND)
-#define EXT2_MAX_REC_LEN ((1 << 16) - 1)
-
-extern int ext2_read_inode(unsigned int n, pInode inode);
-extern int ext2_get_file_inode(const char *path, pInode inode);
-extern int ext2_read_file(const pInode ino, void *buf, size_t count);
-
-#endif //_EXT2_H