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ext2_fs.h
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/*
* linux/include/linux/ext2_fs.h
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/include/linux/minix_fs.h
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/*
* EXT2_*_*() convienience macros added by Andrew Clausen <clausen@gnu.org>
* Copyright (C) 2000, 2009-2014, 2019-2023, 2026 Free Software Foundation,
* Inc.
*/
#ifndef _EXT2_FS_H
#define _EXT2_FS_H
#include <parted/endian.h>
#include <stdint.h>
/*
* The second extended file system constants/structures
*/
#define EXT2_SUPER_MAGIC_CONST 0xEF53
#define EXT2_MIN_BLOCK_SIZE 1024
#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)
#define EXT2_VALID_FS 0x0001
#define EXT2_ERROR_FS 0x0002
#define EXT2_RESERVED_INODE_COUNT 11
/*
* Codes for operating systems
*/
#define EXT2_OS_LINUX 0
#define EXT2_OS_HURD 1
#define EXT2_OS_MASIX 2
#define EXT2_OS_FREEBSD 3
#define EXT2_OS_LITES 4
/*
* Feature set definitions
*/
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT2_FEATURE_COMPAT_HAS_DIR_INDEX 0x0020
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
/*
* Special inodes numbers
*/
#define EXT2_BAD_INO 1 /* Bad blocks inode */
#define EXT2_ROOT_INO 2 /* Root inode */
#define EXT2_ACL_IDX_INO 3 /* ACL inode */
#define EXT2_ACL_DATA_INO 4 /* ACL inode */
#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
/*
* Ext2 directory file types. Only the low 3 bits are used. The
* other bits are reserved for now.
*/
#define EXT2_FT_UNKNOWN 0
#define EXT2_FT_REG_FILE 1
#define EXT2_FT_DIR 2
#define EXT2_FT_CHRDEV 3
#define EXT2_FT_BLKDEV 4
#define EXT2_FT_FIFO 5
#define EXT2_FT_SOCK 6
#define EXT2_FT_SYMLINK 7
/*
* Behaviour when detecting errors
*/
#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
#define EXT2_ERRORS_PANIC 3 /* Panic */
#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
struct ext2_dir_entry_2
{
uint32_t inode;
uint16_t rec_len;
uint8_t name_len;
uint8_t file_type;
char name[255];
};
struct ext2_group_desc
{
uint32_t bg_block_bitmap;
uint32_t bg_inode_bitmap;
uint32_t bg_inode_table;
uint16_t bg_free_blocks_count;
uint16_t bg_free_inodes_count;
uint16_t bg_used_dirs_count;
uint16_t bg_pad;
uint32_t bg_reserved[3];
};
struct ext2_inode
{
uint16_t i_mode; /* File mode */
uint16_t i_uid; /* Owner Uid */
uint32_t i_size; /* Size in bytes */
uint32_t i_atime; /* Access time */
uint32_t i_ctime; /* Creation time */
uint32_t i_mtime; /* Modification time */
uint32_t i_dtime; /* Deletion Time */
uint16_t i_gid; /* Group Id */
uint16_t i_links_count; /* Links count */
uint32_t i_blocks; /* Blocks count */
uint32_t i_flags; /* File flags */
union {
struct {
uint32_t l_i_reserved1;
} linux1;
struct {
uint32_t h_i_translator;
} hurd1;
struct {
uint32_t m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
uint32_t i_generation; /* File version (for NFS) */
uint32_t i_file_acl; /* File ACL */
uint32_t i_dir_acl; /* Directory ACL */
uint32_t i_faddr; /* Fragment address */
union {
struct {
uint8_t l_i_frag; /* Fragment number */
uint8_t l_i_fsize; /* Fragment size */
uint16_t i_pad1;
uint32_t l_i_reserved2[2];
} linux2;
struct {
uint8_t h_i_frag; /* Fragment number */
uint8_t h_i_fsize; /* Fragment size */
uint16_t h_i_mode_high;
uint16_t h_i_uid_high;
uint16_t h_i_gid_high;
uint32_t h_i_author;
} hurd2;
struct {
uint8_t m_i_frag; /* Fragment number */
uint8_t m_i_fsize; /* Fragment size */
uint16_t m_pad1;
uint32_t m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
};
#define i_size_high i_dir_acl
struct __attribute__ ((packed)) ext2_super_block
{
uint32_t s_inodes_count; /* Inodes count */
uint32_t s_blocks_count; /* Blocks count */
uint32_t s_r_blocks_count; /* Reserved blocks count */
uint32_t s_free_blocks_count; /* Free blocks count */
uint32_t s_free_inodes_count; /* Free inodes count */
uint32_t s_first_data_block; /* First Data Block */
uint32_t s_log_block_size; /* Block size */
int32_t s_log_frag_size; /* Fragment size */
uint32_t s_blocks_per_group; /* # Blocks per group */
uint32_t s_frags_per_group; /* # Fragments per group */
uint32_t s_inodes_per_group; /* # Inodes per group */
uint32_t s_mtime; /* Mount time */
uint32_t s_wtime; /* Write time */
uint16_t s_mnt_count; /* Mount count */
int16_t s_max_mnt_count; /* Maximal mount count */
uint16_t s_magic; /* Magic signature */
uint16_t s_state; /* File system state */
uint16_t s_errors; /* Behaviour when detecting errors */
uint16_t s_minor_rev_level; /* minor revision level */
uint32_t s_lastcheck; /* time of last check */
uint32_t s_checkinterval; /* max. time between checks */
uint32_t s_creator_os; /* OS */
uint32_t s_rev_level; /* Revision level */
uint16_t s_def_resuid; /* Default uid for reserved blocks */
uint16_t 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 file system.
*
* 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...
*/
uint32_t s_first_ino; /* First non-reserved inode */
uint16_t s_inode_size; /* size of inode structure */
uint16_t s_block_group_nr; /* block group # of this superblock */
uint32_t s_feature_compat; /* compatible feature set */
uint32_t s_feature_incompat; /* incompatible feature set */
uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
uint8_t s_uuid[16]; /* 128-bit uuid for volume */
char s_volume_name[16]; /* volume name */
char s_last_mounted[64]; /* directory where last mounted */
uint32_t s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT2_COMPAT_PREALLOC flag is on.
*/
uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
uint16_t s_padding1;
/*
* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
*/
uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
uint32_t s_journal_inum; /* inode number of journal file */
uint32_t s_journal_dev; /* device number of journal file */
uint32_t s_last_orphan; /* start of list of inodes to delete */
uint32_t s_reserved[197]; /* Padding to the end of the block */
};
#define EXT2_DIRENT_INODE(dir_ent) (PED_LE32_TO_CPU((dir_ent).inode))
#define EXT2_DIRENT_REC_LEN(dir_ent) (PED_LE16_TO_CPU((dir_ent).rec_len))
#define EXT2_DIRENT_NAME_LEN(dir_ent) ((dir_ent).name_len)
#define EXT2_DIRENT_FILE_TYPE(dir_ent) ((dir_ent).file_type)
#define EXT2_GROUP_BLOCK_BITMAP(gd) (PED_LE32_TO_CPU((gd).bg_block_bitmap))
#define EXT2_GROUP_INODE_BITMAP(gd) (PED_LE32_TO_CPU((gd).bg_inode_bitmap))
#define EXT2_GROUP_INODE_TABLE(gd) (PED_LE32_TO_CPU((gd).bg_inode_table))
#define EXT2_GROUP_FREE_BLOCKS_COUNT(gd) \
(PED_LE16_TO_CPU((gd).bg_free_blocks_count))
#define EXT2_GROUP_FREE_INODES_COUNT(gd) \
(PED_LE16_TO_CPU((gd).bg_free_inodes_count))
#define EXT2_GROUP_USED_DIRS_COUNT(gd) \
(PED_LE16_TO_CPU((gd).bg_used_dirs_count))
#define EXT2_INODE_MODE(inode) (PED_LE16_TO_CPU((inode).i_mode))
#define EXT2_INODE_UID(inode) (PED_LE16_TO_CPU((inode).i_uid))
#define EXT2_INODE_SIZE(inode) \
((uint64_t) PED_LE32_TO_CPU((inode).i_size) \
+ ((uint64_t) PED_LE32_TO_CPU((inode).i_size_high) << 32))
#define EXT2_INODE_ATIME(inode) (PED_LE32_TO_CPU((inode).i_atime))
#define EXT2_INODE_CTIME(inode) (PED_LE32_TO_CPU((inode).i_ctime))
#define EXT2_INODE_MTIME(inode) (PED_LE32_TO_CPU((inode).i_mtime))
#define EXT2_INODE_DTIME(inode) (PED_LE32_TO_CPU((inode).i_dtime))
#define EXT2_INODE_GID(inode) (PED_LE16_TO_CPU((inode).i_gid))
#define EXT2_INODE_LINKS_COUNT(inode) (PED_LE16_TO_CPU((inode).i_links_count))
#define EXT2_INODE_BLOCKS(inode) (PED_LE32_TO_CPU((inode).i_blocks))
#define EXT2_INODE_FLAGS(inode) (PED_LE32_TO_CPU((inode).i_flags))
#define EXT2_INODE_TRANSLATOR(inode) (PED_LE32_TO_CPU((inode).osd1.hurd1.h_i_translator))
#define EXT2_INODE_BLOCK(inode, blk) (PED_LE32_TO_CPU((inode).i_block[blk]))
#define EXT2_SUPER_INODES_COUNT(sb) (PED_LE32_TO_CPU((sb).s_inodes_count))
#define EXT2_SUPER_BLOCKS_COUNT(sb) (PED_LE32_TO_CPU((sb).s_blocks_count))
#define EXT2_SUPER_R_BLOCKS_COUNT(sb) (PED_LE32_TO_CPU((sb).s_r_blocks_count))
#define EXT2_SUPER_FREE_BLOCKS_COUNT(sb) \
(PED_LE32_TO_CPU((sb).s_free_blocks_count))
#define EXT2_SUPER_FREE_INODES_COUNT(sb) \
(PED_LE32_TO_CPU((sb).s_free_inodes_count))
#define EXT2_SUPER_FIRST_DATA_BLOCK(sb) \
(PED_LE32_TO_CPU((sb).s_first_data_block))
#define EXT2_SUPER_LOG_BLOCK_SIZE(sb) (PED_LE32_TO_CPU((sb).s_log_block_size))
#define EXT2_SUPER_LOG_FRAG_SIZE(sb) \
((int32_t) PED_LE32_TO_CPU((sb).s_log_frag_size))
#define EXT2_SUPER_BLOCKS_PER_GROUP(sb) \
(PED_LE32_TO_CPU((sb).s_blocks_per_group))
#define EXT2_SUPER_FRAGS_PER_GROUP(sb) \
(PED_LE32_TO_CPU((sb).s_frags_per_group))
#define EXT2_SUPER_INODES_PER_GROUP(sb) \
(PED_LE32_TO_CPU((sb).s_inodes_per_group))
#define EXT2_SUPER_MTIME(sb) (PED_LE32_TO_CPU((sb).s_mtime))
#define EXT2_SUPER_WTIME(sb) (PED_LE32_TO_CPU((sb).s_wtime))
#define EXT2_SUPER_MNT_COUNT(sb) (PED_LE16_TO_CPU((sb).s_mnt_count))
#define EXT2_SUPER_MAX_MNT_COUNT(sb) \
((int16_t) PED_LE16_TO_CPU((sb).s_max_mnt_count))
#define EXT2_SUPER_MAGIC(sb) (PED_LE16_TO_CPU((sb).s_magic))
#define EXT2_SUPER_STATE(sb) (PED_LE16_TO_CPU((sb).s_state))
#define EXT2_SUPER_ERRORS(sb) (PED_LE16_TO_CPU((sb).s_errors))
#define EXT2_SUPER_MINOR_REV_LEVEL(sb) \
(PED_LE16_TO_CPU((sb).s_minor_rev_level))
#define EXT2_SUPER_LASTCHECK(sb) (PED_LE32_TO_CPU((sb).s_lastcheck))
#define EXT2_SUPER_CHECKINTERVAL(sb) (PED_LE32_TO_CPU((sb).s_checkinterval))
#define EXT2_SUPER_CREATOR_OS(sb) (PED_LE32_TO_CPU((sb).s_creator_os))
#define EXT2_SUPER_REV_LEVEL(sb) (PED_LE32_TO_CPU((sb).s_rev_level))
#define EXT2_SUPER_DEF_RESUID(sb) (PED_LE16_TO_CPU((sb).s_def_resuid))
#define EXT2_SUPER_DEF_RESGID(sb) (PED_LE16_TO_CPU((sb).s_def_resgid))
#define EXT2_SUPER_FIRST_INO(sb) (PED_LE32_TO_CPU((sb).s_first_ino))
#define EXT2_SUPER_INODE_SIZE(sb) (PED_LE16_TO_CPU((sb).s_inode_size))
#define EXT2_SUPER_BLOCK_GROUP_NR(sb) (PED_LE16_TO_CPU((sb).s_block_group_nr))
#define EXT2_SUPER_FEATURE_COMPAT(sb) (PED_LE32_TO_CPU((sb).s_feature_compat))
#define EXT2_SUPER_FEATURE_INCOMPAT(sb) \
(PED_LE32_TO_CPU((sb).s_feature_incompat))
#define EXT2_SUPER_FEATURE_RO_COMPAT(sb) \
(PED_LE32_TO_CPU((sb).s_feature_ro_compat))
#define EXT2_SUPER_UUID(sb) ((sb).s_uuid)
#define EXT2_SUPER_VOLUME_NAME(sb) ((sb).s_volume_name)
#define EXT2_SUPER_LAST_MOUNTED(sb) ((sb).s_last_mounted)
#define EXT2_SUPER_ALGORITHM_USAGE_BITMAP(sb) \
(PED_LE32_TO_CPU((sb).s_algorithm_usage_bitmap))
#define EXT2_SUPER_JOURNAL_UUID(sb) ((sb).s_journal_uuid)
#define EXT2_SUPER_JOURNAL_INUM(sb) (PED_LE32_TO_CPU((sb).s_journal_inum))
#define EXT2_SUPER_JOURNAL_DEV(sb) (PED_LE32_TO_CPU((sb).s_journal_dev))
#define EXT2_SUPER_LAST_ORPHAN(sb) (PED_LE32_TO_CPU((sb).s_last_orphan))
#endif
endian.h
EXT2_N_BLOCKS
#define EXT2_N_BLOCKS
Definition ext2_fs.h:38
ext2_dir_entry_2
Definition ext2_fs.h:102
ext2_dir_entry_2::inode
uint32_t inode
Definition ext2_fs.h:103
ext2_dir_entry_2::rec_len
uint16_t rec_len
Definition ext2_fs.h:104
ext2_dir_entry_2::file_type
uint8_t file_type
Definition ext2_fs.h:106
ext2_dir_entry_2::name
char name[255]
Definition ext2_fs.h:107
ext2_dir_entry_2::name_len
uint8_t name_len
Definition ext2_fs.h:105
ext2_group_desc
Definition ext2_fs.h:111
ext2_group_desc::bg_free_inodes_count
uint16_t bg_free_inodes_count
Definition ext2_fs.h:116
ext2_group_desc::bg_block_bitmap
uint32_t bg_block_bitmap
Definition ext2_fs.h:112
ext2_group_desc::bg_inode_bitmap
uint32_t bg_inode_bitmap
Definition ext2_fs.h:113
ext2_group_desc::bg_inode_table
uint32_t bg_inode_table
Definition ext2_fs.h:114
ext2_group_desc::bg_pad
uint16_t bg_pad
Definition ext2_fs.h:118
ext2_group_desc::bg_used_dirs_count
uint16_t bg_used_dirs_count
Definition ext2_fs.h:117
ext2_group_desc::bg_free_blocks_count
uint16_t bg_free_blocks_count
Definition ext2_fs.h:115
ext2_group_desc::bg_reserved
uint32_t bg_reserved[3]
Definition ext2_fs.h:119
ext2_inode
Definition ext2_fs.h:123
ext2_inode::i_uid
uint16_t i_uid
Definition ext2_fs.h:125
ext2_inode::l_i_frag
uint8_t l_i_frag
Definition ext2_fs.h:153
ext2_inode::i_dir_acl
uint32_t i_dir_acl
Definition ext2_fs.h:149
ext2_inode::h_i_author
uint32_t h_i_author
Definition ext2_fs.h:164
ext2_inode::i_flags
uint32_t i_flags
Definition ext2_fs.h:134
ext2_inode::i_dtime
uint32_t i_dtime
Definition ext2_fs.h:130
ext2_inode::i_size
uint32_t i_size
Definition ext2_fs.h:126
ext2_inode::h_i_uid_high
uint16_t h_i_uid_high
Definition ext2_fs.h:162
ext2_inode::i_faddr
uint32_t i_faddr
Definition ext2_fs.h:150
ext2_inode::i_block
uint32_t i_block[EXT2_N_BLOCKS]
Definition ext2_fs.h:146
ext2_inode::l_i_reserved1
uint32_t l_i_reserved1
Definition ext2_fs.h:137
ext2_inode::i_generation
uint32_t i_generation
Definition ext2_fs.h:147
ext2_inode::h_i_mode_high
uint16_t h_i_mode_high
Definition ext2_fs.h:161
ext2_inode::l_i_fsize
uint8_t l_i_fsize
Definition ext2_fs.h:154
ext2_inode::i_blocks
uint32_t i_blocks
Definition ext2_fs.h:133
ext2_inode::hurd2
struct ext2_inode::@220062305220170273315143251052204364270216127043::@236101277111032320007103002347244072147040042244 hurd2
ext2_inode::m_i_reserved2
uint32_t m_i_reserved2[2]
Definition ext2_fs.h:170
ext2_inode::linux2
struct ext2_inode::@220062305220170273315143251052204364270216127043::@017042060031054147047003012213057226362035151063 linux2
ext2_inode::i_ctime
uint32_t i_ctime
Definition ext2_fs.h:128
ext2_inode::i_mtime
uint32_t i_mtime
Definition ext2_fs.h:129
ext2_inode::m_pad1
uint16_t m_pad1
Definition ext2_fs.h:169
ext2_inode::osd2
union ext2_inode::@220062305220170273315143251052204364270216127043 osd2
ext2_inode::h_i_gid_high
uint16_t h_i_gid_high
Definition ext2_fs.h:163
ext2_inode::h_i_frag
uint8_t h_i_frag
Definition ext2_fs.h:159
ext2_inode::h_i_fsize
uint8_t h_i_fsize
Definition ext2_fs.h:160
ext2_inode::i_links_count
uint16_t i_links_count
Definition ext2_fs.h:132
ext2_inode::h_i_translator
uint32_t h_i_translator
Definition ext2_fs.h:140
ext2_inode::i_mode
uint16_t i_mode
Definition ext2_fs.h:124
ext2_inode::l_i_reserved2
uint32_t l_i_reserved2[2]
Definition ext2_fs.h:156
ext2_inode::m_i_reserved1
uint32_t m_i_reserved1
Definition ext2_fs.h:143
ext2_inode::m_i_frag
uint8_t m_i_frag
Definition ext2_fs.h:167
ext2_inode::osd1
union ext2_inode::@234012356112351332120251202003243201055171257245 osd1
ext2_inode::m_i_fsize
uint8_t m_i_fsize
Definition ext2_fs.h:168
ext2_inode::i_pad1
uint16_t i_pad1
Definition ext2_fs.h:155
ext2_inode::hurd1
struct ext2_inode::@234012356112351332120251202003243201055171257245::@221061101235257330306060263273300263000002363222 hurd1
ext2_inode::i_atime
uint32_t i_atime
Definition ext2_fs.h:127
ext2_inode::masix2
struct ext2_inode::@220062305220170273315143251052204364270216127043::@371305303062020031051316330325342066200321220252 masix2
ext2_inode::i_file_acl
uint32_t i_file_acl
Definition ext2_fs.h:148
ext2_inode::i_gid
uint16_t i_gid
Definition ext2_fs.h:131
ext2_inode::linux1
struct ext2_inode::@234012356112351332120251202003243201055171257245::@334201052275204065210272120044063103014042054372 linux1
ext2_inode::masix1
struct ext2_inode::@234012356112351332120251202003243201055171257245::@023315334040115072041000055222157045063221210004 masix1