219 lines
6.9 KiB
C
219 lines
6.9 KiB
C
// ext2.h
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// Author: Josh Holtrop
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// Date: 08/22/04
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// Modified: 12/24/04
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#ifndef __HOS_EXT2_H__
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#define __HOS_EXT2_H__ __HOS_EXT2_H__
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#include "hos_defines.h"
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#include "fs/devices.h"
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#include "fs/vfs.h"
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#define EXT2_MAGIC 0xEF53
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#define EXT2_NAME_LEN 255
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#define EXT2_I_MODE_ATTR_MASK 0x0FFF
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#define EXT2_I_MODE_OX 0x0001
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#define EXT2_I_MODE_OW 0x0002
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#define EXT2_I_MODE_OR 0x0004
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#define EXT2_I_MODE_GX 0x0008
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#define EXT2_I_MODE_GW 0x0010
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#define EXT2_I_MODE_GR 0x0020
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#define EXT2_I_MODE_UX 0x0040
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#define EXT2_I_MODE_UW 0x0080
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#define EXT2_I_MODE_UR 0x0100
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#define EXT2_I_MODE_STICKY 0x0200
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#define EXT2_I_MODE_SGID 0x0400
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#define EXT2_I_MODE_SUID 0x0800
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#define EXT2_I_MODE_TYPE_MASK 0xF000
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#define EXT2_I_MODE_FIFO 0x1000
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#define EXT2_I_MODE_CHAR 0x2000
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#define EXT2_I_MODE_DIR 0x4000
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#define EXT2_I_MODE_BLOCK 0x6000
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#define EXT2_I_MODE_FILE 0x8000
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#define EXT2_I_MODE_SYM 0xA000
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#define EXT2_I_MODE_SOCK 0xC000
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#define EXT2_I_FLAGS_SEC_DEL 0x01
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#define EXT2_I_FLAGS_UNDELETE 0x02
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#define EXT2_I_FLAGS_COMPRESS 0x04
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#define EXT2_I_FLAGS_SYNC 0x08
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#define EXT2_I_FLAGS_IMMUTABLE 0x10
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#define EXT2_I_FLAGS_APPEND 0x20
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#define EXT2_I_FLAGS_NODUMP 0x40
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#define EXT2_INODE_BAD_BLOCKS 1
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#define EXT2_INODE_ROOT 2
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#define EXT2_INODE_ACL_INDEX 3
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#define EXT2_INODE_ACL_DATA 4
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#define EXT2_INODE_BOOT_LOADER 5
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#define EXT2_INODE_UNDELETE_DIR 6
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#define EXT2_INODE_AVAIL 11
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#define EXT2_FT_UNKNOWN 0
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#define EXT2_FT_FILE 1
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#define EXT2_FT_DIR 2
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#define EXT2_FT_CHAR 3
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#define EXT2_FT_BLOCK 4
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#define EXT2_FT_FIFO 5
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#define EXT2_FT_SOCK 6
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#define EXT2_FT_SYMLINK 7
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#define EXT2_FT_MAX 8
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typedef struct
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{
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u32_t s_inodes_count; /* Inodes count */
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u32_t s_blocks_count; /* Blocks count */
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u32_t s_r_blocks_count; /* Reserved blocks count */
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u32_t s_free_blocks_count; /* Free blocks count */
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u32_t s_free_inodes_count; /* Free inodes count */
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u32_t s_first_data_block; /* First Data Block */
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u32_t s_log_block_size; /* Block size: 0->1024, 1->2048, 2->4096 */
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int s_log_frag_size; /* Fragment size */
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u32_t s_blocks_per_group; /* # Blocks per group */
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u32_t s_frags_per_group; /* # Fragments per group */
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u32_t s_inodes_per_group; /* # Inodes per group */
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u32_t s_mtime; /* Mount time */
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u32_t s_wtime; /* Write time */
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u16_t s_mnt_count; /* Mount count */
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short s_max_mnt_count; /* Maximal mount count */
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u16_t s_magic; /* Magic signature */
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u16_t s_state; /* File system state */
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u16_t s_errors; /* Behaviour when detecting errors */
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u16_t s_minor_rev_level; /* minor revision level */
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u32_t s_lastcheck; /* time of last check */
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u32_t s_checkinterval; /* max. time between checks */
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u32_t s_creator_os; /* OS */
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u32_t s_rev_level; /* Revision level */
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u16_t s_def_resuid; /* Default uid for reserved blocks */
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u16_t s_def_resgid; /* Default gid for reserved blocks */
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u32_t s_reserved[235];
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} ext2_super_block_t;
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typedef struct
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{
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u32_t bg_block_bitmap; // Blocks bitmap block
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u32_t bg_inode_bitmap; // Inode bitmap block
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u32_t bg_inode_table; // Inode table block
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u16_t bg_free_blocks_count; // Free blocks count
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u16_t bg_free_inodes_count; // Free Inodes count
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u16_t bg_used_dirs_count; // Directories count
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u16_t bg_pad1;
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u32_t bg_reserved[3];
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} ext2_group_desc_t;
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typedef struct
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{
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u16_t i_mode; // File mode
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u16_t i_uid; // Owner UID
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u32_t i_size; // Size in bytes
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u32_t i_atime; // Access time
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u32_t i_ctime; // Creation time
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u32_t i_mtime; // Modification time
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u32_t i_dtime; // Deletion time
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u16_t i_gid; // Group ID
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u16_t i_links_count; // Links count
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u32_t i_blocks; // Blocks count
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u32_t i_flags; // File flags
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u32_t i_reserved1;
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u32_t i_block[15]; // Pointers to file blocks
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u32_t i_version; // File version (for NFS)
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u32_t i_file_acl; // File ACL
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u32_t i_dir_acl; // Directory ACL
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u32_t i_faddr; // Fragment address
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u8_t i_frag; // Fragment number
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u8_t i_fsize; // Fragment size
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u16_t i_pad1;
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u32_t i_reserved2[2];
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} ext2_inode_t;
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typedef struct
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{
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u32_t inode; // inode number
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u16_t length; // directory entry length
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u8_t name_length; // name length
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u8_t file_type; // File type
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char name[EXT2_NAME_LEN];
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} ext2_dir_entry_t;
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typedef struct
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{
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ext2_inode_t inode;
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u32_t block;
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u32_t *block_pointers;
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u32_t block_pointers_start;
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} ext2_open_inode_t;
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typedef struct
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{
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ext2_open_inode_t *open_inode;
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u32_t position;
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} ext2_open_dir_t;
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typedef struct
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{
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ext2_open_inode_t *open_inode;
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u32_t position;
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u32_t buffer_start;
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u32_t buffer_bytes;
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u8_t *buffer;
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} ext2__open_file_t;
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typedef struct
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{
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ext2_open_inode_t *open_inode;
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u32_t block;
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} ext2__open_block_file_t;
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static inline u32_t ext2_diskToFSBlock(u32_t block, ext2_super_block_t *super)
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{
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// convert # of disk blocks to # of filesystem blocks
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return block >> (super->s_log_block_size + 1);
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}
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static inline u32_t ext2_FSToDiskBlock(u32_t block, ext2_super_block_t *super)
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{
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// convert # of filesystem blocks to # of disk blocks
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return block << (super->s_log_block_size + 1);
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}
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int ext2_init(int fsID);
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void *ext2_mount_super(major_t major, minor_t minor);
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int ext2_umount_super(vfs_mount_t *mount);
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ext2_inode_t ext2_get_inode(vfs_mount_t *mount, u32_t inode);
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ext2_group_desc_t ext2_get_group_desc(vfs_mount_t *mount, u32_t group);
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int ext2_stat(vfs_mount_t *mount, char *file, vfs_stat_t *stat);
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ext2_open_inode_t *ext2_open_inode(vfs_mount_t *mount, u32_t inode_number);
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int ext2_close_inode(vfs_mount_t *mount, ext2_open_inode_t *open_inode);
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int ext2_read_inode_block(vfs_mount_t *mount, ext2_open_inode_t *open_inode, void *block);
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u32_t ext2_block_number(vfs_mount_t *mount, ext2_open_inode_t *open_inode);
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u32_t ext2_get_inode_number(vfs_mount_t *mount, char *file);
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int ext2_inode_seek(vfs_mount_t *mount, ext2_open_inode_t *open_inode, u32_t block_number);
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int ext2_inode_status(vfs_mount_t *mount, u32_t inode_number);
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int ext2_block_status(vfs_mount_t *mount, u32_t block_number);
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ext2_open_dir_t *ext2_open_dir(vfs_mount_t *mount, u32_t inode_number);
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int ext2_dir_read_entry(vfs_mount_t *mount, ext2_open_dir_t *open_dir, ext2_dir_entry_t *dentry);
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int ext2_close_dir(vfs_mount_t *mount, ext2_open_dir_t *open_dir);
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int ext2_dir_lookup(vfs_mount_t *mount, u32_t dir_inode, char *fileName, ext2_dir_entry_t *direntry);
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int ext2__open_dir(vfs_mount_t *mount, char *file, vfs_open_file_t *dir);
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int ext2__read_dir(vfs_mount_t *mount, vfs_open_file_t *dir, vfs_dir_entry_t *dentry);
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int ext2__close_dir(vfs_mount_t *mount, vfs_open_file_t *dir);
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int ext2__open_file(vfs_mount_t *mount, char *file, vfs_open_file_t *open_file);
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int ext2__read_file(vfs_mount_t *mount, vfs_open_file_t *open_file);
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int ext2__close_file(vfs_mount_t *mount, vfs_open_file_t *open_file);
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int ext2__open_block_file(vfs_mount_t *mount, char *file, vfs_open_file_t *open_file);
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int ext2__read_block_file(vfs_mount_t *mount, vfs_open_file_t *open_file, void *buffer);
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int ext2__block_file_seek(vfs_mount_t *mount, vfs_open_file_t *open_file, u32_t block_number);
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int ext2__close_block_file(vfs_mount_t *mount, vfs_open_file_t *open_file);
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#endif
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