132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
#ifndef __FS__EXT2_H__
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#define __FS__EXT2_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <lib/part.h>
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#include <lib/blib.h>
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/* Superblock Fields */
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struct ext2_superblock {
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uint32_t s_inodes_count;
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uint32_t s_blocks_count;
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uint32_t s_r_blocks_count;
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uint32_t s_free_blocks_count;
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uint32_t s_free_inodes_count;
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uint32_t s_first_data_block;
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uint32_t s_log_block_size;
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uint32_t s_log_frag_size;
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uint32_t s_blocks_per_group;
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uint32_t s_frags_per_group;
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uint32_t s_inodes_per_group;
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uint32_t s_mtime;
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uint32_t s_wtime;
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uint16_t s_mnt_count;
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uint16_t s_max_mnt_count;
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uint16_t s_magic;
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uint16_t s_state;
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uint16_t s_errors;
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uint16_t s_minor_rev_level;
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uint32_t s_lastcheck;
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uint32_t s_checkinterval;
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uint32_t s_creator_os;
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uint32_t s_rev_level;
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uint16_t s_def_resuid;
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uint16_t s_def_gid;
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// if version number >= 1, we have to use the ext2 extended superblock as well
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/* Extended Superblock */
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uint32_t s_first_ino;
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uint16_t s_inode_size;
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uint16_t s_block_group_nr;
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uint32_t s_feature_compat;
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uint32_t s_feature_incompat;
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uint32_t s_feature_ro_compat;
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uint64_t s_uuid[2];
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uint64_t s_volume_name[2];
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uint64_t s_last_mounted[8];
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uint32_t compression_info;
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uint8_t prealloc_blocks;
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uint8_t prealloc_dir_blocks;
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uint16_t reserved_gdt_blocks;
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uint8_t journal_uuid[16];
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uint32_t journal_inum;
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uint32_t journal_dev;
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uint32_t last_orphan;
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uint32_t hash_seed[4];
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uint8_t def_hash_version;
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uint8_t jnl_backup_type;
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uint16_t group_desc_size;
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uint32_t default_mount_opts;
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uint32_t first_meta_bg;
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uint32_t mkfs_time;
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uint32_t jnl_blocks[17];
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} __attribute__((packed));
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struct ext2_linux {
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uint8_t frag_num;
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uint8_t frag_size;
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uint16_t reserved_16;
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uint16_t user_id_high;
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uint16_t group_id_high;
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uint32_t reserved_32;
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} __attribute__((packed));
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struct ext2_inode {
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uint16_t i_mode;
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uint16_t i_uid;
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uint32_t i_size;
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uint32_t i_atime;
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uint32_t i_ctime;
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uint32_t i_mtime;
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uint32_t i_dtime;
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uint16_t i_gid;
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uint16_t i_links_count;
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uint32_t i_blocks_count;
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uint32_t i_flags;
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uint32_t i_osd1;
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uint32_t i_blocks[15];
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uint32_t i_generation;
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/* EXT2 v >= 1.0 */
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uint32_t i_eab;
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uint32_t i_maj;
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/* EXT2 vAll */
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uint32_t i_frag_block;
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struct ext2_linux i_osd2;
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} __attribute__((packed));
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struct ext2_file_handle {
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struct volume *part;
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struct ext2_superblock sb;
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int size;
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struct ext2_inode root_inode;
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struct ext2_inode inode;
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uint64_t block_size;
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uint32_t *alloc_map;
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};
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int ext2_check_signature(struct volume *part);
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bool ext2_get_guid(struct guid *guid, struct volume *part);
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int ext2_open(struct ext2_file_handle *ret, struct volume *part, const char *path);
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int ext2_read(struct ext2_file_handle *file, void *buf, uint64_t loc, uint64_t count);
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#endif
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