Mark
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
#pragma once
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#include <stdint.h>
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#include "fs.h"
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#define EXT2_MAGIC ((uint16_t) 0xEF53)
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#define EXT2_SBSIZ 1024
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#define EXT2_SBOFF 1024
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#define EXT2_ROOTINO 2
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#define EXT2_GOOD ((uint16_t) 1)
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#define EXT2_BAD ((uint16_t) 2)
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#define EXT2_EACT_IGN ((uint16_t) 1)
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#define EXT2_EACT_REM ((uint16_t) 2)
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#define EXT2_EACT_PAN ((uint16_t) 3)
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#define EXT2_TYPE_REG ((uint16_t) 0x8000)
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#define EXT2_TYPE_DIR ((uint16_t) 0x4000)
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#define EXT2_TYPE_LNK ((uint16_t) 0xA000)
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struct ext2_sb {
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uint32_t inode_count;
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uint32_t block_count;
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uint32_t su_reserved;
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uint32_t free_block_count;
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uint32_t free_inode_count;
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uint32_t sb_block_number;
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uint32_t block_size_log;
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uint32_t frag_size_log;
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uint32_t block_group_size_blocks;
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uint32_t block_group_size_frags;
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uint32_t block_group_size_inodes;
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uint32_t last_mount_time;
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uint32_t last_mtime;
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uint16_t mount_count_since_fsck;
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uint16_t mount_max_before_fsck;
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uint16_t magic;
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uint16_t fs_state;
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uint16_t error_action;
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uint16_t version_minor;
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uint32_t last_fsck_time;
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uint32_t os_id;
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uint32_t version_major;
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uint16_t su_uid;
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uint16_t su_gid;
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} __attribute__((packed));
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struct ext2_extsb {
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struct ext2_sb sb;
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uint32_t first_non_reserved;
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uint16_t inode_struct_size;
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uint16_t backup_group_number;
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uint32_t optional_features;
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uint32_t required_features;
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uint32_t ro_required_features;
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char fsid[16];
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char volname[16];
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char last_mount_path[64];
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uint32_t compression;
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uint8_t prealloc_file_block_number;
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uint8_t prealloc_dir_block_number;
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uint16_t __un0;
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char journal_id[16];
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uint32_t journal_inode;
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uint32_t journal_dev;
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uint32_t orphan_inode_head;
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// driver-specific info
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uint32_t block_size;
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uint32_t block_group_count;
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uint32_t block_group_descriptor_table_block;
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uint32_t block_group_descriptor_table_size_blocks;
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struct ext2_grp_desc *block_group_descriptor_table;
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} __attribute__((packed));
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struct ext2_grp_desc {
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uint32_t block_usage_bitmap_block;
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uint32_t inode_usage_bitmap_block;
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uint32_t inode_table_block;
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uint16_t free_blocks;
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uint16_t free_inodes;
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uint16_t dir_count;
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char __pad[14];
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} __attribute__((packed));
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struct ext2_inode {
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uint16_t type_perm;
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uint16_t uid;
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uint32_t size_lower;
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uint32_t atime;
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uint32_t ctime;
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uint32_t mtime;
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uint32_t dtime;
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uint16_t gid;
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uint16_t hard_link_count;
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uint32_t disk_sector_count;
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uint32_t flags;
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uint32_t os_value_1;
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uint32_t direct_blocks[12];
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uint32_t l1_indirect_block;
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uint32_t l2_indirect_block;
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uint32_t l3_indirect_block;
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uint32_t gen_number;
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uint32_t acl;
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union {
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uint32_t dir_acl;
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uint32_t size_upper;
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};
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uint32_t frag_block_addr;
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char os_value_2[12];
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} __attribute__((packed));
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struct ext2_dirent {
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uint32_t ino;
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uint16_t len;
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uint8_t name_len;
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uint8_t type_ind;
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char name[];
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} __attribute__((packed));
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void ext2_class_init(void);
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enum vnode_type ext2_inode_type(struct ext2_inode *i);
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// Implemented in ext2blk.c
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int ext2_write_superblock(fs_t *ext2);
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int ext2_read_block(fs_t *ext2, uint32_t block_no, void *buf);
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int ext2_write_block(fs_t *ext2, uint32_t block_no, const void *buf);
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int ext2_read_inode_block(fs_t *ext2, struct ext2_inode *inode, uint32_t index, void *buf);
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int ext2_write_inode_block(fs_t *ext2, struct ext2_inode *inode, uint32_t index, const void *buf);
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int ext2_read_inode(fs_t *ext2, struct ext2_inode *inode, uint32_t ino);
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int ext2_write_inode(fs_t *ext2, const struct ext2_inode *inode, uint32_t ino);
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// Implemented in ext2alloc.c
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int ext2_alloc_block(fs_t *ext2, uint32_t *block_no);
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int ext2_free_block(fs_t *ext2, uint32_t block_no);
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int ext2_inode_alloc_block(fs_t *ext2, struct ext2_inode *inode, uint32_t ino, uint32_t index);
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int ext2_free_inode_block(fs_t *ext2, struct ext2_inode *inode, uint32_t ino, uint32_t index);
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int ext2_free_inode(fs_t *ext2, uint32_t ino);
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int ext2_alloc_inode(fs_t *ext2, uint32_t *ino);
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// Implemented in ext2dir.c
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int ext2_dir_add_inode(fs_t *ext2, vnode_t *dir, const char *name, uint32_t ino);
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int ext2_dir_remove_inode(fs_t *ext2, vnode_t *dir, const char *name, uint32_t ino);
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extern struct vnode_operations ext2_vnode_ops;
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