153 lines
3.0 KiB
C
153 lines
3.0 KiB
C
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#ifndef EXT2_H
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#define EXT2_h
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#include <system.h>
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#include <fs.h>
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#define EXT2_SUPER_MAGIC 0xEF53
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struct ext2_superblock {
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uint32_t inodes_count;
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uint32_t blocks_count;
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uint32_t r_blocks_count;
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uint32_t free_blocks_count;
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uint32_t free_inodes_count;
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uint32_t first_data_block;
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uint32_t log_block_size;
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uint32_t log_frag_size;
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uint32_t blocks_per_group;
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uint32_t frags_per_group;
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uint32_t inodes_per_group;
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uint32_t mtime;
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uint32_t wtime;
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uint16_t mnt_count;
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uint16_t max_mnt_count;
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uint16_t magic;
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uint16_t state;
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uint16_t errors;
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uint16_t minor_rev_level;
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uint32_t lastcheck;
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uint32_t checkinterval;
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uint32_t creator_os;
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uint32_t rev_level;
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uint16_t def_resuid;
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uint16_t def_resgid;
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/* EXT2_DYNAMIC_REV */
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uint32_t first_ino;
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uint16_t inode_size;
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uint16_t block_group_nr;
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uint32_t feature_compat;
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uint32_t feature_incompat;
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uint32_t feature_ro_compat;
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uint8_t uuid[16];
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uint8_t volume_name[16];
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uint8_t last_mounted[16];
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uint32_t algo_bitmap;
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/* Performance Hints */
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uint8_t prealloc_blocks;
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uint8_t prealloc_dir_blocks;
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uint16_t _padding;
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/* Journaling Support */
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uint8_t journal_uuid[16];
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uint32_t journal_inum;
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uint32_t jounral_dev;
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uint32_t last_orphan;
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/* Directory Indexing Support */
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uint32_t hash_seed[4];
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uint8_t def_hash_version;
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uint16_t _padding_a;
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uint8_t _padding_b;
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/* Other Options */
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uint32_t default_mount_options;
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uint32_t first_meta_bg;
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uint8_t _unused[760];
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} __attribute__((packed));
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typedef struct ext2_superblock ext2_superblock_t;
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struct ext2_bgdescriptor {
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uint32_t block_bitmap;
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uint32_t inode_bitmap;
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uint32_t inode_table;
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uint16_t free_blocks_count;
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uint16_t free_inodes_count;
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uint16_t used_dirs_count;
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uint16_t pad;
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uint8_t reserved[12];
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} __attribute__((packed));
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typedef struct ext2_bgdescriptor ext2_bgdescriptor_t;
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/* File Types */
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#define EXT2_S_IFSOCK 0xC000
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#define EXT2_S_IFLNK 0xA000
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#define EXT2_S_IFREG 0x8000
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#define EXT2_S_IFBLK 0x6000
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#define EXT2_S_IFDIR 0x4000
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#define EXT2_S_IFCHR 0x2000
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#define EXT2_S_IFIFO 0x1000
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/* setuid, etc. */
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#define EXT2_S_ISUID 0x0800
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#define EXT2_S_ISGID 0x0400
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#define EXT2_S_ISVTX 0x0200
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/* rights */
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#define EXT2_S_IRUSR 0x0100
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#define EXT2_S_IWUSR 0x0080
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#define EXT2_S_IXUSR 0x0040
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#define EXT2_S_IRGRP 0x0020
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#define EXT2_S_IWGRP 0x0010
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#define EXT2_S_IXGRP 0x0008
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#define EXT2_S_IROTH 0x0004
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#define EXT2_S_IWOTH 0x0002
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#define EXT2_S_IXOTH 0x0001
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struct ext2_inodetable {
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uint16_t mode;
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uint16_t uid;
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uint32_t size;
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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 links_count;
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uint32_t blocks;
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uint32_t flags;
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uint32_t osd1;
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uint32_t block[15];
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uint32_t generation;
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uint32_t file_acl;
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uint32_t dir_acl;
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uint32_t faddr;
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uint8_t osd2[12];
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} __attribute__((packed));
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typedef struct ext2_inodetable ext2_inodetable_t;
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struct ext2_dir {
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uint32_t inode;
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uint16_t rec_len;
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uint8_t name_len;
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uint8_t file_type;
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char name; /* Actually a set of characters, at most 255 bytes */
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} __attribute__((packed));
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typedef struct ext2_dir ext2_dir_t;
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#endif
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