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Edit File : ext2_fs.h \| Size : 41.09 KB
/* * 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 / #ifndef _LINUX_EXT2_FS_H #define _LINUX_EXT2_FS_H #include <ext2fs/ext2_types.h> / Changed from linux/types.h / #ifndef __GNUC_PREREQ #if defined(__GNUC__) && defined(__GNUC_MINOR__) #define __GNUC_PREREQ(maj, min) \ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) #else #define __GNUC_PREREQ(maj, min) 0 #endif #endif / * The second extended filesystem constants/structures / / * Define EXT2FS_DEBUG to produce debug messages / #undef EXT2FS_DEBUG / * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files / #define EXT2_PREALLOCATE #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 / * The second extended file system version / #define EXT2FS_DATE "95/08/09" #define EXT2FS_VERSION "0.5b" / * Special inode numbers / #define EXT2_BAD_INO 1 / Bad blocks inode / #define EXT2_ROOT_INO 2 / Root inode / #define EXT4_USR_QUOTA_INO 3 / User quota inode / #define EXT4_GRP_QUOTA_INO 4 / Group quota inode / #define EXT2_BOOT_LOADER_INO 5 / Boot loader inode / #define EXT2_UNDEL_DIR_INO 6 / Undelete directory inode / #define EXT2_RESIZE_INO 7 / Reserved group descriptors inode / #define EXT2_JOURNAL_INO 8 / Journal inode / #define EXT2_EXCLUDE_INO 9 / The "exclude" inode, for snapshots / #define EXT4_REPLICA_INO 10 / Used by non-upstream feature / / First non-reserved inode for old ext2 filesystems / #define EXT2_GOOD_OLD_FIRST_INO 11 / * The second extended file system magic number / #define EXT2_SUPER_MAGIC 0xEF53 #ifdef __KERNEL__ #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) #else / Assume that user mode programs are passing in an ext2fs superblock, not * a kernel struct super_block. This will allow us to call the feature-test * macros from user land. / #define EXT2_SB(sb) (sb) #endif / * Maximal count of links to a file / #define EXT2_LINK_MAX 65000 / * Macro-instructions used to manage several block sizes / #define EXT2_MIN_BLOCK_LOG_SIZE 10 / 1024 / #define EXT2_MAX_BLOCK_LOG_SIZE 16 / 65536 / #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) #ifdef __KERNEL__ #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) #else #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) #endif #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) / * Macro-instructions used to manage allocation clusters / #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE #define EXT2_MAX_CLUSTER_LOG_SIZE 29 / 512MB / #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ (s)->s_log_cluster_size) #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) / * Macro-instructions used to manage fragments * * Note: for backwards compatibility only, for the dump program. * Ext2/3/4 will never support fragments.... / #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) #define EXT2_FRAGS_PER_BLOCK(s) 1 / * ACL structures / struct ext2_acl_header / Header of Access Control Lists / { __u32 aclh_size; __u32 aclh_file_count; __u32 aclh_acle_count; __u32 aclh_first_acle; }; struct ext2_acl_entry / Access Control List Entry / { __u32 acle_size; __u16 acle_perms; / Access permissions / __u16 acle_type; / Type of entry / __u16 acle_tag; / User or group identity / __u16 acle_pad1; __u32 acle_next; / Pointer on next entry for the / / same inode or on next free entry / }; / * Structure of a blocks group descriptor / struct ext2_group_desc { __u32 bg_block_bitmap; / Blocks bitmap block / __u32 bg_inode_bitmap; / Inodes bitmap block / __u32 bg_inode_table; / Inodes table block / __u16 bg_free_blocks_count; / Free blocks count / __u16 bg_free_inodes_count; / Free inodes count / __u16 bg_used_dirs_count; / Directories count / __u16 bg_flags; __u32 bg_exclude_bitmap_lo; / Exclude bitmap for snapshots / __u16 bg_block_bitmap_csum_lo;/ crc32c(s_uuid+grp_num+bitmap) LSB / __u16 bg_inode_bitmap_csum_lo;/ crc32c(s_uuid+grp_num+bitmap) LSB / __u16 bg_itable_unused; / Unused inodes count / __u16 bg_checksum; / crc16(s_uuid+group_num+group_desc)/ }; / * Structure of a blocks group descriptor / struct ext4_group_desc { __u32 bg_block_bitmap; / Blocks bitmap block / __u32 bg_inode_bitmap; / Inodes bitmap block / __u32 bg_inode_table; / Inodes table block / __u16 bg_free_blocks_count; / Free blocks count / __u16 bg_free_inodes_count; / Free inodes count / __u16 bg_used_dirs_count; / Directories count / __u16 bg_flags; / EXT4_BG_flags (INODE_UNINIT, etc) / __u32 bg_exclude_bitmap_lo; / Exclude bitmap for snapshots / __u16 bg_block_bitmap_csum_lo;/ crc32c(s_uuid+grp_num+bitmap) LSB / __u16 bg_inode_bitmap_csum_lo;/ crc32c(s_uuid+grp_num+bitmap) LSB / __u16 bg_itable_unused; / Unused inodes count / __u16 bg_checksum; / crc16(sb_uuid+group+desc) / __u32 bg_block_bitmap_hi; / Blocks bitmap block MSB / __u32 bg_inode_bitmap_hi; / Inodes bitmap block MSB / __u32 bg_inode_table_hi; / Inodes table block MSB / __u16 bg_free_blocks_count_hi;/ Free blocks count MSB / __u16 bg_free_inodes_count_hi;/ Free inodes count MSB / __u16 bg_used_dirs_count_hi; / Directories count MSB / __u16 bg_itable_unused_hi; / Unused inodes count MSB / __u32 bg_exclude_bitmap_hi; / Exclude bitmap block MSB / __u16 bg_block_bitmap_csum_hi;/ crc32c(s_uuid+grp_num+bitmap) MSB / __u16 bg_inode_bitmap_csum_hi;/ crc32c(s_uuid+grp_num+bitmap) MSB / __u32 bg_reserved; }; #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ sizeof(__u16)) #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \ (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ sizeof(__u16)) #define EXT2_BG_INODE_UNINIT 0x0001 / Inode table/bitmap not initialized / #define EXT2_BG_BLOCK_UNINIT 0x0002 / Block bitmap not initialized / #define EXT2_BG_INODE_ZEROED 0x0004 / On-disk itable initialized to zero / / * Data structures used by the directory indexing feature * * Note: all of the multibyte integer fields are little endian. / / * Note: dx_root_info is laid out so that if it should somehow get * overlaid by a dirent the two low bits of the hash version will be * zero. Therefore, the hash version mod 4 should never be 0. * Sincerely, the paranoia department. / struct ext2_dx_root_info { __u32 reserved_zero; __u8 hash_version; / 0 now, 1 at release / __u8 info_length; / 8 / __u8 indirect_levels; __u8 unused_flags; }; #define EXT2_HASH_LEGACY 0 #define EXT2_HASH_HALF_MD4 1 #define EXT2_HASH_TEA 2 #define EXT2_HASH_LEGACY_UNSIGNED 3 / reserved for userspace lib / #define EXT2_HASH_HALF_MD4_UNSIGNED 4 / reserved for userspace lib / #define EXT2_HASH_TEA_UNSIGNED 5 / reserved for userspace lib / #define EXT2_HASH_FLAG_INCOMPAT 0x1 #define EXT4_DX_BLOCK_MASK 0x0fffffff struct ext2_dx_entry { __le32 hash; __le32 block; }; struct ext2_dx_countlimit { __le16 limit; __le16 count; }; / * This goes at the end of each htree block. / struct ext2_dx_tail { __le32 dt_reserved; __le32 dt_checksum; / crc32c(uuid+inum+dxblock) / }; / * Macro-instructions used to manage group descriptors / #define EXT2_MIN_DESC_SIZE 32 #define EXT2_MIN_DESC_SIZE_64BIT 64 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE #define EXT2_DESC_SIZE(s) \ ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ (s)->s_desc_size : EXT2_MIN_DESC_SIZE) #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) / limits imposed by 16-bit value gd_free_{blocks,inode}_count / #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) \ (EXT2_CLUSTER_SIZE(s) / \ EXT2_BLOCK_SIZE(s))) #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ EXT2_INODES_PER_BLOCK(s)) #ifdef __KERNEL__ #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) #else #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) #endif #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \ (g)) #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \ (g)) /* * Constants relative to the data blocks / #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) / * Inode flags / #define EXT2_SECRM_FL 0x00000001 / Secure deletion / #define EXT2_UNRM_FL 0x00000002 / Undelete / #define EXT2_COMPR_FL 0x00000004 / Compress file / #define EXT2_SYNC_FL 0x00000008 / Synchronous updates / #define EXT2_IMMUTABLE_FL 0x00000010 / Immutable file / #define EXT2_APPEND_FL 0x00000020 / writes to file may only append / #define EXT2_NODUMP_FL 0x00000040 / do not dump file / #define EXT2_NOATIME_FL 0x00000080 / do not update atime / / Reserved for compression usage... / #define EXT2_DIRTY_FL 0x00000100 #define EXT2_COMPRBLK_FL 0x00000200 / One or more compressed clusters / #define EXT2_NOCOMPR_FL 0x00000400 / Access raw compressed data / / nb: was previously EXT2_ECOMPR_FL / #define EXT4_ENCRYPT_FL 0x00000800 / encrypted inode / / End compression flags --- maybe not all used / #define EXT2_BTREE_FL 0x00001000 / btree format dir / #define EXT2_INDEX_FL 0x00001000 / hash-indexed directory / #define EXT2_IMAGIC_FL 0x00002000 #define EXT3_JOURNAL_DATA_FL 0x00004000 / file data should be journaled / #define EXT2_NOTAIL_FL 0x00008000 / file tail should not be merged / #define EXT2_DIRSYNC_FL 0x00010000 / Synchronous directory modifications / #define EXT2_TOPDIR_FL 0x00020000 / Top of directory hierarchies/ #define EXT4_HUGE_FILE_FL 0x00040000 / Set to each huge file / #define EXT4_EXTENTS_FL 0x00080000 / Inode uses extents / #define EXT4_VERITY_FL 0x00100000 / Verity protected inode / #define EXT4_EA_INODE_FL 0x00200000 / Inode used for large EA / / EXT4_EOFBLOCKS_FL 0x00400000 was here / #define FS_NOCOW_FL 0x00800000 / Do not cow file / #define EXT4_SNAPFILE_FL 0x01000000 / Inode is a snapshot / #define EXT4_SNAPFILE_DELETED_FL 0x04000000 / Snapshot is being deleted / #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 / Snapshot shrink has completed / #define EXT4_INLINE_DATA_FL 0x10000000 / Inode has inline data / #define EXT4_PROJINHERIT_FL 0x20000000 / Create with parents projid / #define EXT4_CASEFOLD_FL 0x40000000 / Casefolded file / #define EXT2_RESERVED_FL 0x80000000 / reserved for ext2 lib / #define EXT2_FL_USER_VISIBLE 0x604BDFFF / User visible flags / #define EXT2_FL_USER_MODIFIABLE 0x604B80FF / User modifiable flags / / * ioctl commands / / Used for online resize / struct ext2_new_group_input { __u32 group; / Group number for this data / __u32 block_bitmap; / Absolute block number of block bitmap / __u32 inode_bitmap; / Absolute block number of inode bitmap / __u32 inode_table; / Absolute block number of inode table start / __u32 blocks_count; / Total number of blocks in this group / __u16 reserved_blocks; / Number of reserved blocks in this group / __u16 unused; / Number of reserved GDT blocks in group / }; struct ext4_new_group_input { __u32 group; / Group number for this data / __u64 block_bitmap; / Absolute block number of block bitmap / __u64 inode_bitmap; / Absolute block number of inode bitmap / __u64 inode_table; / Absolute block number of inode table start / __u32 blocks_count; / Total number of blocks in this group / __u16 reserved_blocks; / Number of reserved blocks in this group / __u16 unused; }; #ifdef __GNU__ / Needed for the Hurd / #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) #endif #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) #define EXT2_IOC_GETVERSION _IOR('v', 1, long) #define EXT2_IOC_SETVERSION _IOW('v', 2, long) #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) / * Structure of an inode on the disk / struct ext2_inode { /00/ __u16 i_mode; / File mode / __u16 i_uid; / Low 16 bits of Owner Uid / __u32 i_size; / Size in bytes / __u32 i_atime; / Access time / __u32 i_ctime; / Inode change time / /10/ __u32 i_mtime; / Modification time / __u32 i_dtime; / Deletion Time / __u16 i_gid; / Low 16 bits of Group Id / __u16 i_links_count; / Links count / __u32 i_blocks; / Blocks count / /20/ __u32 i_flags; / File flags / union { struct { __u32 l_i_version; / was l_i_reserved1 / } linux1; struct { __u32 h_i_translator; } hurd1; } osd1; / OS dependent 1 / /28/ __u32 i_block[EXT2_N_BLOCKS];/ Pointers to blocks / /64/ __u32 i_generation; / File version (for NFS) / __u32 i_file_acl; / File ACL / __u32 i_size_high; /70/ __u32 i_faddr; / Fragment address / union { struct { __u16 l_i_blocks_hi; __u16 l_i_file_acl_high; __u16 l_i_uid_high; / these 2 fields / __u16 l_i_gid_high; / were reserved2[0] / __u16 l_i_checksum_lo; / crc32c(uuid+inum+inode) / __u16 l_i_reserved; } linux2; struct { __u8 h_i_frag; / Fragment number / __u8 h_i_fsize; / Fragment size / __u16 h_i_mode_high; __u16 h_i_uid_high; __u16 h_i_gid_high; __u32 h_i_author; } hurd2; } osd2; / OS dependent 2 / }; / * Permanent part of an large inode on the disk / struct ext2_inode_large { /00/ __u16 i_mode; / File mode / __u16 i_uid; / Low 16 bits of Owner Uid / __u32 i_size; / Size in bytes / __u32 i_atime; / Access time / __u32 i_ctime; / Inode Change time / /10/ __u32 i_mtime; / Modification time / __u32 i_dtime; / Deletion Time / __u16 i_gid; / Low 16 bits of Group Id / __u16 i_links_count; / Links count / __u32 i_blocks; / Blocks count / /20/ __u32 i_flags; / File flags / union { struct { __u32 l_i_version; / was l_i_reserved1 / } linux1; struct { __u32 h_i_translator; } hurd1; } osd1; / OS dependent 1 / /28/ __u32 i_block[EXT2_N_BLOCKS];/ Pointers to blocks / /64/ __u32 i_generation; / File version (for NFS) / __u32 i_file_acl; / File ACL / __u32 i_size_high; /70/ __u32 i_faddr; / Fragment address / union { struct { __u16 l_i_blocks_hi; __u16 l_i_file_acl_high; __u16 l_i_uid_high; / these 2 fields / __u16 l_i_gid_high; / were reserved2[0] / __u16 l_i_checksum_lo; / crc32c(uuid+inum+inode) / __u16 l_i_reserved; } linux2; struct { __u8 h_i_frag; / Fragment number / __u8 h_i_fsize; / Fragment size / __u16 h_i_mode_high; __u16 h_i_uid_high; __u16 h_i_gid_high; __u32 h_i_author; } hurd2; } osd2; / OS dependent 2 / /80/ __u16 i_extra_isize; __u16 i_checksum_hi; / crc32c(uuid+inum+inode) / __u32 i_ctime_extra; / extra Change time (nsec << 2 \| epoch) / __u32 i_mtime_extra; / extra Modification time (nsec << 2 \| epoch) / __u32 i_atime_extra; / extra Access time (nsec << 2 \| epoch) / /90/ __u32 i_crtime; / File creation time / __u32 i_crtime_extra; / extra File creation time (nsec << 2 \| epoch)/ __u32 i_version_hi; / high 32 bits for 64-bit version / /9c/ __u32 i_projid; / Project ID / }; #define EXT4_INODE_CSUM_HI_EXTRA_END \ (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \ EXT2_GOOD_OLD_INODE_SIZE) #define EXT4_EPOCH_BITS 2 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) #define i_checksum_lo osd2.linux2.l_i_checksum_lo #define inode_includes(size, field) \ (size >= (sizeof(((struct ext2_inode_large )0)->field) + \ offsetof(struct ext2_inode_large, field))) #if defined(__KERNEL__) \|\| defined(__linux__) #define i_reserved1 osd1.linux1.l_i_reserved1 #define i_frag osd2.linux2.l_i_frag #define i_fsize osd2.linux2.l_i_fsize #define i_uid_low i_uid #define i_gid_low i_gid #define i_uid_high osd2.linux2.l_i_uid_high #define i_gid_high osd2.linux2.l_i_gid_high #else #if defined(__GNU__) #define i_translator osd1.hurd1.h_i_translator #define i_frag osd2.hurd2.h_i_frag; #define i_fsize osd2.hurd2.h_i_fsize; #define i_uid_high osd2.hurd2.h_i_uid_high #define i_gid_high osd2.hurd2.h_i_gid_high #define i_author osd2.hurd2.h_i_author #endif /* __GNU__ / #endif / defined(__KERNEL__) \|\| defined(__linux__) / #define inode_uid(inode) ((inode).i_uid \| (inode).osd2.linux2.l_i_uid_high << 16) #define inode_gid(inode) ((inode).i_gid \| (inode).osd2.linux2.l_i_gid_high << 16) #define inode_projid(inode) ((inode).i_projid) #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) static inline struct ext2_inode EXT2_INODE(struct ext2_inode_large large_inode) { return (struct ext2_inode ) large_inode; } /* * File system states / #define EXT2_VALID_FS 0x0001 / Unmounted cleanly / #define EXT2_ERROR_FS 0x0002 / Errors detected / #define EXT3_ORPHAN_FS 0x0004 / Orphans being recovered / / * Misc. filesystem flags / #define EXT2_FLAGS_SIGNED_HASH 0x0001 / Signed dirhash in use / #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 / Unsigned dirhash in use / #define EXT2_FLAGS_TEST_FILESYS 0x0004 / OK for use on development code / #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 / This is a snapshot image / #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 / Snapshot inodes corrupted / #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 / Exclude bitmaps corrupted / / * Mount flags / #define EXT2_MOUNT_CHECK 0x0001 / Do mount-time checks / #define EXT2_MOUNT_GRPID 0x0004 / Create files with directory's group / #define EXT2_MOUNT_DEBUG 0x0008 / Some debugging messages / #define EXT2_MOUNT_ERRORS_CONT 0x0010 / Continue on errors / #define EXT2_MOUNT_ERRORS_RO 0x0020 / Remount fs ro on errors / #define EXT2_MOUNT_ERRORS_PANIC 0x0040 / Panic on errors / #define EXT2_MOUNT_MINIX_DF 0x0080 / Mimics the Minix statfs / #define EXT2_MOUNT_NO_UID32 0x0200 / Disable 32-bit UIDs / #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt #define set_opt(o, opt) o \|= EXT2_MOUNT_##opt #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ EXT2_MOUNT_##opt) / * Maximal mount counts between two filesystem checks / #define EXT2_DFL_MAX_MNT_COUNT 20 / Allow 20 mounts / #define EXT2_DFL_CHECKINTERVAL 0 / Don't use interval check / / * 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 #if (__GNUC__ >= 4) #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) #else #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE )0)->MEMBER) #endif /* Metadata checksum algorithms / #define EXT2_CRC32C_CHKSUM 1 / Encryption algorithms, key size and key reference len / #define EXT4_ENCRYPTION_MODE_INVALID 0 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 #define EXT4_AES_256_XTS_KEY_SIZE 64 #define EXT4_AES_256_GCM_KEY_SIZE 32 #define EXT4_AES_256_CBC_KEY_SIZE 32 #define EXT4_AES_256_CTS_KEY_SIZE 32 #define EXT4_MAX_KEY_SIZE 64 #define EXT4_KEY_DESCRIPTOR_SIZE 8 #define EXT4_CRYPTO_BLOCK_SIZE 16 / Password derivation constants / #define EXT4_MAX_PASSPHRASE_SIZE 1024 #define EXT4_MAX_SALT_SIZE 256 #define EXT4_PBKDF2_ITERATIONS 0xFFFF #define EXT2_LABEL_LEN 16 / * Policy provided via an ioctl on the topmost directory. This * structure is also in the kernel. / struct ext4_encryption_policy { char version; char contents_encryption_mode; char filenames_encryption_mode; char flags; char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE]; } __attribute__((__packed__)); struct ext4_encryption_key { __u32 mode; char raw[EXT4_MAX_KEY_SIZE]; __u32 size; } __attribute__((__packed__)); / * Structure of the super block / struct ext2_super_block { /000/ __u32 s_inodes_count; / Inodes count / __u32 s_blocks_count; / Blocks count / __u32 s_r_blocks_count; / Reserved blocks count / __u32 s_free_blocks_count; / Free blocks count / /010/ __u32 s_free_inodes_count; / Free inodes count / __u32 s_first_data_block; / First Data Block / __u32 s_log_block_size; / Block size / __u32 s_log_cluster_size; / Allocation cluster size / /020/ __u32 s_blocks_per_group; / # Blocks per group / __u32 s_clusters_per_group; / # Fragments per group / __u32 s_inodes_per_group; / # Inodes per group / __u32 s_mtime; / Mount time / /030/ __u32 s_wtime; / Write time / __u16 s_mnt_count; / Mount count / __s16 s_max_mnt_count; / Maximal mount count / __u16 s_magic; / Magic signature / __u16 s_state; / File system state / __u16 s_errors; / Behaviour when detecting errors / __u16 s_minor_rev_level; / minor revision level / /040/ __u32 s_lastcheck; / time of last check / __u32 s_checkinterval; / max. time between checks / __u32 s_creator_os; / OS / __u32 s_rev_level; / Revision level / /050/ __u16 s_def_resuid; / Default uid for reserved blocks / __u16 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 filesystem. * * 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... / __u32 s_first_ino; / First non-reserved inode / __u16 s_inode_size; / size of inode structure / __u16 s_block_group_nr; / block group # of this superblock / __u32 s_feature_compat; / compatible feature set / /060/ __u32 s_feature_incompat; / incompatible feature set / __u32 s_feature_ro_compat; / readonly-compatible feature set / /068/ __u8 s_uuid[16]; / 128-bit uuid for volume / /078/ __u8 s_volume_name[EXT2_LABEL_LEN]; / volume name, no NUL? / /088/ __u8 s_last_mounted[64]; / directory last mounted on, no NUL? / /0c8/ __u32 s_algorithm_usage_bitmap; / For compression / / * Performance hints. Directory preallocation should only * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. / __u8 s_prealloc_blocks; / Nr of blocks to try to preallocate/ __u8 s_prealloc_dir_blocks; / Nr to preallocate for dirs / __u16 s_reserved_gdt_blocks; / Per group table for online growth / / * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. / /0d0/ __u8 s_journal_uuid[16]; / uuid of journal superblock / /0e0/ __u32 s_journal_inum; / inode number of journal file / __u32 s_journal_dev; / device number of journal file / __u32 s_last_orphan; / start of list of inodes to delete / /0ec/ __u32 s_hash_seed[4]; / HTREE hash seed / /0fc/ __u8 s_def_hash_version; / Default hash version to use / __u8 s_jnl_backup_type; / Default type of journal backup / __u16 s_desc_size; / Group desc. size: INCOMPAT_64BIT / /100/ __u32 s_default_mount_opts; / default EXT2_MOUNT_* flags used / __u32 s_first_meta_bg; / First metablock group / __u32 s_mkfs_time; / When the filesystem was created / /10c/ __u32 s_jnl_blocks[17]; / Backup of the journal inode / /150/ __u32 s_blocks_count_hi; / Blocks count high 32bits / __u32 s_r_blocks_count_hi; / Reserved blocks count high 32 bits/ __u32 s_free_blocks_hi; / Free blocks count / __u16 s_min_extra_isize; / All inodes have at least # bytes / __u16 s_want_extra_isize; / New inodes should reserve # bytes / /160/ __u32 s_flags; / Miscellaneous flags / __u16 s_raid_stride; / RAID stride in blocks / __u16 s_mmp_update_interval; / # seconds to wait in MMP checking / __u64 s_mmp_block; / Block for multi-mount protection / /170/ __u32 s_raid_stripe_width; / blocks on all data disks (Nstride)/ __u8 s_log_groups_per_flex; /* FLEX_BG group size / __u8 s_checksum_type; / metadata checksum algorithm / __u8 s_encryption_level; / versioning level for encryption / __u8 s_reserved_pad; / Padding to next 32bits / __u64 s_kbytes_written; / nr of lifetime kilobytes written / /180/ __u32 s_snapshot_inum; / Inode number of active snapshot / __u32 s_snapshot_id; / sequential ID of active snapshot / __u64 s_snapshot_r_blocks_count; / active snapshot reserved blocks / /190/ __u32 s_snapshot_list; / inode number of disk snapshot list / #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) __u32 s_error_count; / number of fs errors / __u32 s_first_error_time; / first time an error happened / __u32 s_first_error_ino; / inode involved in first error / /1a0/ __u64 s_first_error_block; / block involved in first error / __u8 s_first_error_func[32]; / function where error hit, no NUL? / /1c8/ __u32 s_first_error_line; / line number where error happened / __u32 s_last_error_time; / most recent time of an error / /1d0/ __u32 s_last_error_ino; / inode involved in last error / __u32 s_last_error_line; / line number where error happened / __u64 s_last_error_block; / block involved of last error / /1e0/ __u8 s_last_error_func[32]; / function where error hit, no NUL? / #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) /200/ __u8 s_mount_opts[64]; / default mount options, no NUL? / /240/ __u32 s_usr_quota_inum; / inode number of user quota file / __u32 s_grp_quota_inum; / inode number of group quota file / __u32 s_overhead_blocks; / overhead blocks/clusters in fs / /24c/ __u32 s_backup_bgs[2]; / If sparse_super2 enabled / /254/ __u8 s_encrypt_algos[4]; / Encryption algorithms in use / /258/ __u8 s_encrypt_pw_salt[16]; / Salt used for string2key algorithm / /268/ __le32 s_lpf_ino; / Location of the lost+found inode / __le32 s_prj_quota_inum; / inode for tracking project quota / /270/ __le32 s_checksum_seed; / crc32c(orig_uuid) if csum_seed set / /274/ __u8 s_wtime_hi; __u8 s_mtime_hi; __u8 s_mkfs_time_hi; __u8 s_lastcheck_hi; __u8 s_first_error_time_hi; __u8 s_last_error_time_hi; __u8 s_pad[2]; /27c/ __le16 s_encoding; / Filename charset encoding / __le16 s_encoding_flags; / Filename charset encoding flags / __le32 s_reserved[95]; / Padding to the end of the block / /3fc/ __u32 s_checksum; / crc32c(superblock) / }; #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) #define EXT2_LEN_STR(buf) (int)sizeof(buf), (char )buf /* * Codes for operating systems / #define EXT2_OS_LINUX 0 #define EXT2_OS_HURD 1 #define EXT2_OBSO_OS_MASIX 2 #define EXT2_OS_FREEBSD 3 #define EXT2_OS_LITES 4 / * Revision levels / #define EXT2_GOOD_OLD_REV 0 / The good old (original) format / #define EXT2_DYNAMIC_REV 1 / V2 format w/ dynamic inode sizes / #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV #define EXT2_GOOD_OLD_INODE_SIZE 128 / * Journal inode backup types / #define EXT3_JNL_BACKUP_BLOCKS 1 / * Feature set definitions / #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->s_feature_compat & (mask) ) #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ ( EXT2_SB(sb)->s_feature_incompat & (mask) ) #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 / #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy / #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 / #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used / #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 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 / * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group * descriptor checksums use the same algorithm as all other data * structures' checksums. / #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 / Project quota / #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 / Needs recovery / #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 / Journal device / #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 / >2GB or 3-lvl htree / #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 / data in inode / #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \ static inline int ext2fs_has_feature_##name(struct ext2_super_block sb) \ { \ return ((EXT2_SB(sb)->s_feature_compat & \ EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \ } \ static inline void ext2fs_set_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_compat \|= \ EXT##ver##_FEATURE_COMPAT_##flagname; \ } \ static inline void ext2fs_clear_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_compat &= \ ~EXT##ver##_FEATURE_COMPAT_##flagname; \ } #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \ static inline int ext2fs_has_feature_##name(struct ext2_super_block sb) \ { \ return ((EXT2_SB(sb)->s_feature_ro_compat & \ EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \ } \ static inline void ext2fs_set_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_ro_compat \|= \ EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ } \ static inline void ext2fs_clear_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_ro_compat &= \ ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ } #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \ static inline int ext2fs_has_feature_##name(struct ext2_super_block sb) \ { \ return ((EXT2_SB(sb)->s_feature_incompat & \ EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \ } \ static inline void ext2fs_set_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_incompat \|= \ EXT##ver##_FEATURE_INCOMPAT_##flagname; \ } \ static inline void ext2fs_clear_feature_##name(struct ext2_super_block sb) \ { \ EXT2_SB(sb)->s_feature_incompat &= \ ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \ } EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC) EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES) EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL) EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR) EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE) EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX) EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG) EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP) EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2) EXT4_FEATURE_COMPAT_FUNCS(fast_commit, 4, FAST_COMMIT) EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER) EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE) EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE) EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM) EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK) EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE) EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT) EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA) EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC) EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM) EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA) EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY) EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT) EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS) EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY) EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION) EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE) EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER) EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV) EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG) EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS) EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT) EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP) EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG) EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE) EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA) EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED) EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR) EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA) EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT) EXT4_FEATURE_INCOMPAT_FUNCS(casefold, 4, CASEFOLD) #define EXT2_FEATURE_COMPAT_SUPP 0 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE\| \ EXT4_FEATURE_INCOMPAT_MMP\| \ EXT4_FEATURE_INCOMPAT_LARGEDIR\| \ EXT4_FEATURE_INCOMPAT_EA_INODE) #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER\| \ EXT2_FEATURE_RO_COMPAT_LARGE_FILE\| \ EXT4_FEATURE_RO_COMPAT_DIR_NLINK\| \ EXT2_FEATURE_RO_COMPAT_BTREE_DIR\| \ EXT4_FEATURE_RO_COMPAT_VERITY) /* * Default values for user and/or group using reserved blocks / #define EXT2_DEF_RESUID 0 #define EXT2_DEF_RESGID 0 / * Default mount options / #define EXT2_DEFM_DEBUG 0x0001 #define EXT2_DEFM_BSDGROUPS 0x0002 #define EXT2_DEFM_XATTR_USER 0x0004 #define EXT2_DEFM_ACL 0x0008 #define EXT2_DEFM_UID16 0x0010 #define EXT3_DEFM_JMODE 0x0060 #define EXT3_DEFM_JMODE_DATA 0x0020 #define EXT3_DEFM_JMODE_ORDERED 0x0040 #define EXT3_DEFM_JMODE_WBACK 0x0060 #define EXT4_DEFM_NOBARRIER 0x0100 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 #define EXT4_DEFM_DISCARD 0x0400 #define EXT4_DEFM_NODELALLOC 0x0800 / * Structure of a directory entry / #define EXT2_NAME_LEN 255 struct ext2_dir_entry { __u32 inode; / Inode number / __u16 rec_len; / Directory entry length / __u16 name_len; / Name length / char name[EXT2_NAME_LEN]; / File name / }; / * The new version of the directory entry. Since EXT2 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the * file_type field. * * This structure is deprecated due to endian issues. Please use struct * ext2_dir_entry and accessor functions * ext2fs_dirent_name_len * ext2fs_dirent_set_name_len * ext2fs_dirent_file_type * ext2fs_dirent_set_file_type * to get and set name_len and file_type fields. / struct ext2_dir_entry_2 { __u32 inode; / Inode number / __u16 rec_len; / Directory entry length / __u8 name_len; / Name length / __u8 file_type; char name[EXT2_NAME_LEN]; / File name / }; / * This is a bogus directory entry at the end of each leaf block that * records checksums. / struct ext2_dir_entry_tail { __u32 det_reserved_zero1; / Pretend to be unused / __u16 det_rec_len; / 12 / __u16 det_reserved_name_len; / 0xDE00, fake namelen/filetype / __u32 det_checksum; / crc32c(uuid+inode+dirent) / }; / * 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 #define EXT2_FT_MAX 8 / * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we * have to build ext2_dir_entry_tail with that assumption too. This * constant helps to build the dir_entry_tail to look like it has an * "invalid" file type. / #define EXT2_DIR_NAME_LEN_CSUM 0xDE00 / * EXT2_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 4 / #define EXT2_DIR_ENTRY_HEADER_LEN 8 #define EXT2_DIR_PAD 4 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) #define EXT2_DIR_REC_LEN(name_len) (((name_len) + \ EXT2_DIR_ENTRY_HEADER_LEN + \ EXT2_DIR_ROUND) & \ ~EXT2_DIR_ROUND) / * Constants for ext4's extended time encoding / #define EXT4_EPOCH_BITS 2 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) / * This structure is used for multiple mount protection. It is written * into the block number saved in the s_mmp_block field in the superblock. * Programs that check MMP should assume that if SEQ_FSCK (or any unknown * code above SEQ_MAX) is present then it is NOT safe to use the filesystem, * regardless of how old the timestamp is. * * The timestamp in the MMP structure will be updated by e2fsck at some * arbitrary intervals (start of passes, after every few groups of inodes * in pass1 and pass1b). There is no guarantee that e2fsck is updating * the MMP block in a timely manner, and the updates it does are purely * for the convenience of the sysadmin and not for automatic validation. * * Note: Only the mmp_seq value is used to determine whether the MMP block * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname * fields are only for informational purposes for the administrator, * due to clock skew between nodes and hostname HA service takeover. / #define EXT4_MMP_MAGIC 0x004D4D50U / ASCII for MMP / #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U / mmp_seq value for clean unmount / #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U / mmp_seq value when being fscked / #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU / maximum valid mmp_seq value / / Not endian-annotated; it's swapped at read/write time / struct mmp_struct { __u32 mmp_magic; / Magic number for MMP / __u32 mmp_seq; / Sequence no. updated periodically / __u64 mmp_time; / Time last updated (seconds) / __u8 mmp_nodename[64]; / Node updating MMP block, no NUL? / __u8 mmp_bdevname[32]; / Bdev updating MMP block, no NUL? / __u16 mmp_check_interval; / Changed mmp_check_interval / __u16 mmp_pad1; __u32 mmp_pad2[226]; __u32 mmp_checksum; / crc32c(uuid+mmp_block) / }; / * Default interval for MMP update in seconds. / #define EXT4_MMP_UPDATE_INTERVAL 5 / * Maximum interval for MMP update in seconds. / #define EXT4_MMP_MAX_UPDATE_INTERVAL 300 / * Minimum interval for MMP checking in seconds. / #define EXT4_MMP_MIN_CHECK_INTERVAL 5 / * Minimum size of inline data. / #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) EXT2_N_BLOCKS)) /* * Size of a parent inode in inline data directory. / #define EXT4_INLINE_DATA_DOTDOT_SIZE (4) #define EXT4_ENC_UTF8_12_1 1 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) / Reject invalid sequences / #endif / _LINUX_EXT2_FS_H */ Back

Edit File : ext2_fs.h | Size : 41.09 KB

/*
 *  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
 */

#ifndef _LINUX_EXT2_FS_H
#define _LINUX_EXT2_FS_H

#include <ext2fs/ext2_types.h>		/* Changed from linux/types.h */

#ifndef __GNUC_PREREQ
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
#define __GNUC_PREREQ(maj, min) \
	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
#define __GNUC_PREREQ(maj, min) 0
#endif
#endif

/*
 * The second extended filesystem constants/structures
 */

/*
 * Define EXT2FS_DEBUG to produce debug messages
 */
#undef EXT2FS_DEBUG

/*
 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
 */
#define EXT2_PREALLOCATE
#define EXT2_DEFAULT_PREALLOC_BLOCKS	8

/*
 * The second extended file system version
 */
#define EXT2FS_DATE		"95/08/09"
#define EXT2FS_VERSION		"0.5b"

/*
 * Special inode numbers
 */
#define EXT2_BAD_INO		 1	/* Bad blocks inode */
#define EXT2_ROOT_INO		 2	/* Root inode */
#define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
#define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
#define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
#define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
#define EXT2_RESIZE_INO		 7	/* Reserved group descriptors inode */
#define EXT2_JOURNAL_INO	 8	/* Journal inode */
#define EXT2_EXCLUDE_INO	 9	/* The "exclude" inode, for snapshots */
#define EXT4_REPLICA_INO	10	/* Used by non-upstream feature */

/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO	11

/*
 * The second extended file system magic number
 */
#define EXT2_SUPER_MAGIC	0xEF53

#ifdef __KERNEL__
#define EXT2_SB(sb)	(&((sb)->u.ext2_sb))
#else
/* Assume that user mode programs are passing in an ext2fs superblock, not
 * a kernel struct super_block.  This will allow us to call the feature-test
 * macros from user land. */
#define EXT2_SB(sb)	(sb)
#endif

/*
 * Maximal count of links to a file
 */
#define EXT2_LINK_MAX		65000

/*
 * Macro-instructions used to manage several block sizes
 */
#define EXT2_MIN_BLOCK_LOG_SIZE		10	/* 1024 */
#define EXT2_MAX_BLOCK_LOG_SIZE		16	/* 65536 */
#define EXT2_MIN_BLOCK_SIZE	(1 << EXT2_MIN_BLOCK_LOG_SIZE)
#define EXT2_MAX_BLOCK_SIZE	(1 << EXT2_MAX_BLOCK_LOG_SIZE)
#ifdef __KERNEL__
#define EXT2_BLOCK_SIZE(s)	((s)->s_blocksize)
#define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
#define EXT2_ADDR_PER_BLOCK_BITS(s)	(EXT2_SB(s)->addr_per_block_bits)
#define EXT2_INODE_SIZE(s)	(EXT2_SB(s)->s_inode_size)
#define EXT2_FIRST_INO(s)	(EXT2_SB(s)->s_first_ino)
#else
#define EXT2_BLOCK_SIZE(s)	(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
#define EXT2_INODE_SIZE(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
				 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
#define EXT2_FIRST_INO(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
				 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
#endif
#define EXT2_ADDR_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof(__u32))

/*
 * Macro-instructions used to manage allocation clusters
 */
#define EXT2_MIN_CLUSTER_LOG_SIZE	EXT2_MIN_BLOCK_LOG_SIZE
#define EXT2_MAX_CLUSTER_LOG_SIZE	29	/* 512MB  */
#define EXT2_MIN_CLUSTER_SIZE		EXT2_MIN_BLOCK_SIZE
#define EXT2_MAX_CLUSTER_SIZE		(1 << EXT2_MAX_CLUSTER_LOG_SIZE)
#define EXT2_CLUSTER_SIZE(s)		(EXT2_MIN_BLOCK_SIZE << \
						(s)->s_log_cluster_size)
#define EXT2_CLUSTER_SIZE_BITS(s)	((s)->s_log_cluster_size + 10)

/*
 * Macro-instructions used to manage fragments
 *
 * Note: for backwards compatibility only, for the dump program.
 * Ext2/3/4 will never support fragments....
 */
#define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
#define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
#define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
#define EXT2_FRAG_SIZE(s)		EXT2_BLOCK_SIZE(s)
#define EXT2_FRAGS_PER_BLOCK(s)		1

/*
 * ACL structures
 */
struct ext2_acl_header	/* Header of Access Control Lists */
{
	__u32	aclh_size;
	__u32	aclh_file_count;
	__u32	aclh_acle_count;
	__u32	aclh_first_acle;
};

struct ext2_acl_entry	/* Access Control List Entry */
{
	__u32	acle_size;
	__u16	acle_perms;	/* Access permissions */
	__u16	acle_type;	/* Type of entry */
	__u16	acle_tag;	/* User or group identity */
	__u16	acle_pad1;
	__u32	acle_next;	/* Pointer on next entry for the */
					/* same inode or on next free entry */
};

/*
 * Structure of a blocks group descriptor
 */
struct ext2_group_desc
{
	__u32	bg_block_bitmap;	/* Blocks bitmap block */
	__u32	bg_inode_bitmap;	/* Inodes bitmap block */
	__u32	bg_inode_table;		/* Inodes table block */
	__u16	bg_free_blocks_count;	/* Free blocks count */
	__u16	bg_free_inodes_count;	/* Free inodes count */
	__u16	bg_used_dirs_count;	/* Directories count */
	__u16	bg_flags;
	__u32	bg_exclude_bitmap_lo;	/* Exclude bitmap for snapshots */
	__u16	bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	__u16	bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	__u16	bg_itable_unused;	/* Unused inodes count */
	__u16	bg_checksum;		/* crc16(s_uuid+group_num+group_desc)*/
};

/*
 * Structure of a blocks group descriptor
 */
struct ext4_group_desc
{
	__u32	bg_block_bitmap;	/* Blocks bitmap block */
	__u32	bg_inode_bitmap;	/* Inodes bitmap block */
	__u32	bg_inode_table;		/* Inodes table block */
	__u16	bg_free_blocks_count;	/* Free blocks count */
	__u16	bg_free_inodes_count;	/* Free inodes count */
	__u16	bg_used_dirs_count;	/* Directories count */
	__u16	bg_flags;		/* EXT4_BG_flags (INODE_UNINIT, etc) */
	__u32	bg_exclude_bitmap_lo;	/* Exclude bitmap for snapshots */
	__u16	bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	__u16	bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	__u16	bg_itable_unused;	/* Unused inodes count */
	__u16	bg_checksum;		/* crc16(sb_uuid+group+desc) */
	__u32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
	__u32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
	__u32	bg_inode_table_hi;	/* Inodes table block MSB */
	__u16	bg_free_blocks_count_hi;/* Free blocks count MSB */
	__u16	bg_free_inodes_count_hi;/* Free inodes count MSB */
	__u16	bg_used_dirs_count_hi;	/* Directories count MSB */
	__u16	bg_itable_unused_hi;	/* Unused inodes count MSB */
	__u32	bg_exclude_bitmap_hi;	/* Exclude bitmap block MSB */
	__u16	bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
	__u16	bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
	__u32	bg_reserved;
};

#define EXT4_BG_INODE_BITMAP_CSUM_HI_END	\
	(offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
	 sizeof(__u16))
#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION	\
	(offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
	 sizeof(__u16))

#define EXT2_BG_INODE_UNINIT	0x0001 /* Inode table/bitmap not initialized */
#define EXT2_BG_BLOCK_UNINIT	0x0002 /* Block bitmap not initialized */
#define EXT2_BG_INODE_ZEROED	0x0004 /* On-disk itable initialized to zero */

/*
 * Data structures used by the directory indexing feature
 *
 * Note: all of the multibyte integer fields are little endian.
 */

/*
 * Note: dx_root_info is laid out so that if it should somehow get
 * overlaid by a dirent the two low bits of the hash version will be
 * zero.  Therefore, the hash version mod 4 should never be 0.
 * Sincerely, the paranoia department.
 */
struct ext2_dx_root_info {
	__u32 reserved_zero;
	__u8 hash_version; /* 0 now, 1 at release */
	__u8 info_length; /* 8 */
	__u8 indirect_levels;
	__u8 unused_flags;
};

#define EXT2_HASH_LEGACY		0
#define EXT2_HASH_HALF_MD4		1
#define EXT2_HASH_TEA			2
#define EXT2_HASH_LEGACY_UNSIGNED	3 /* reserved for userspace lib */
#define EXT2_HASH_HALF_MD4_UNSIGNED	4 /* reserved for userspace lib */
#define EXT2_HASH_TEA_UNSIGNED		5 /* reserved for userspace lib */

#define EXT2_HASH_FLAG_INCOMPAT	0x1

#define EXT4_DX_BLOCK_MASK 0x0fffffff

struct ext2_dx_entry {
	__le32 hash;
	__le32 block;
};

struct ext2_dx_countlimit {
	__le16 limit;
	__le16 count;
};

/*
 * This goes at the end of each htree block.
 */
struct ext2_dx_tail {
	__le32 dt_reserved;
	__le32 dt_checksum;	/* crc32c(uuid+inum+dxblock) */
};

/*
 * Macro-instructions used to manage group descriptors
 */
#define EXT2_MIN_DESC_SIZE             32
#define EXT2_MIN_DESC_SIZE_64BIT       64
#define EXT2_MAX_DESC_SIZE             EXT2_MIN_BLOCK_SIZE
#define EXT2_DESC_SIZE(s)                                                \
       ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
	(s)->s_desc_size : EXT2_MIN_DESC_SIZE)

#define EXT2_BLOCKS_PER_GROUP(s)	(EXT2_SB(s)->s_blocks_per_group)
#define EXT2_INODES_PER_GROUP(s)	(EXT2_SB(s)->s_inodes_per_group)
#define EXT2_CLUSTERS_PER_GROUP(s)	(EXT2_SB(s)->s_clusters_per_group)
#define EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
#define EXT2_MAX_BLOCKS_PER_GROUP(s)	((((unsigned) 1 << 16) - 8) *	\
					 (EXT2_CLUSTER_SIZE(s) / \
					  EXT2_BLOCK_SIZE(s)))
#define EXT2_MAX_CLUSTERS_PER_GROUP(s)	(((unsigned) 1 << 16) - 8)
#define EXT2_MAX_INODES_PER_GROUP(s)	(((unsigned) 1 << 16) - \
					 EXT2_INODES_PER_BLOCK(s))
#ifdef __KERNEL__
#define EXT2_DESC_PER_BLOCK(s)		(EXT2_SB(s)->s_desc_per_block)
#define EXT2_DESC_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_desc_per_block_bits)
#else
#define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
#endif

#define EXT2_GROUPS_TO_BLOCKS(s, g)   ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \
				       (g))
#define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \
				       (g))

/*
 * Constants relative to the data blocks
 */
#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)

/*
 * Inode flags
 */
#define EXT2_SECRM_FL			0x00000001 /* Secure deletion */
#define EXT2_UNRM_FL			0x00000002 /* Undelete */
#define EXT2_COMPR_FL			0x00000004 /* Compress file */
#define EXT2_SYNC_FL			0x00000008 /* Synchronous updates */
#define EXT2_IMMUTABLE_FL		0x00000010 /* Immutable file */
#define EXT2_APPEND_FL			0x00000020 /* writes to file may only append */
#define EXT2_NODUMP_FL			0x00000040 /* do not dump file */
#define EXT2_NOATIME_FL			0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define EXT2_DIRTY_FL			0x00000100
#define EXT2_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
#define EXT2_NOCOMPR_FL			0x00000400 /* Access raw compressed data */
	/* nb: was previously EXT2_ECOMPR_FL */
#define EXT4_ENCRYPT_FL			0x00000800 /* encrypted inode */
/* End compression flags --- maybe not all used */
#define EXT2_BTREE_FL			0x00001000 /* btree format dir */
#define EXT2_INDEX_FL			0x00001000 /* hash-indexed directory */
#define EXT2_IMAGIC_FL			0x00002000
#define EXT3_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
#define EXT2_NOTAIL_FL			0x00008000 /* file tail should not be merged */
#define EXT2_DIRSYNC_FL 		0x00010000 /* Synchronous directory modifications */
#define EXT2_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
#define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
#define EXT4_EXTENTS_FL 		0x00080000 /* Inode uses extents */
#define EXT4_VERITY_FL			0x00100000 /* Verity protected inode */
#define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
/* EXT4_EOFBLOCKS_FL 0x00400000 was here */
#define FS_NOCOW_FL			0x00800000 /* Do not cow file */
#define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
#define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
#define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
#define EXT4_INLINE_DATA_FL		0x10000000 /* Inode has inline data */
#define EXT4_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
#define EXT4_CASEFOLD_FL		0x40000000 /* Casefolded file */
#define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */

#define EXT2_FL_USER_VISIBLE		0x604BDFFF /* User visible flags */
#define EXT2_FL_USER_MODIFIABLE		0x604B80FF /* User modifiable flags */

/*
 * ioctl commands
 */

/* Used for online resize */
struct ext2_new_group_input {
	__u32 group;		/* Group number for this data */
	__u32 block_bitmap;	/* Absolute block number of block bitmap */
	__u32 inode_bitmap;	/* Absolute block number of inode bitmap */
	__u32 inode_table;	/* Absolute block number of inode table start */
	__u32 blocks_count;	/* Total number of blocks in this group */
	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
	__u16 unused;		/* Number of reserved GDT blocks in group */
};

struct ext4_new_group_input {
	__u32 group;		/* Group number for this data */
	__u64 block_bitmap;	/* Absolute block number of block bitmap */
	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
	__u64 inode_table;	/* Absolute block number of inode table start */
	__u32 blocks_count;	/* Total number of blocks in this group */
	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
	__u16 unused;
};

#ifdef __GNU__			/* Needed for the Hurd */
#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
#endif

#define EXT2_IOC_GETFLAGS		_IOR('f', 1, long)
#define EXT2_IOC_SETFLAGS		_IOW('f', 2, long)
#define EXT2_IOC_GETVERSION		_IOR('v', 1, long)
#define EXT2_IOC_SETVERSION		_IOW('v', 2, long)
#define EXT2_IOC_GETVERSION_NEW		_IOR('f', 3, long)
#define EXT2_IOC_SETVERSION_NEW		_IOW('f', 4, long)
#define EXT2_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
#define EXT2_IOC_GROUP_ADD		_IOW('f', 8,struct ext2_new_group_input)
#define EXT4_IOC_GROUP_ADD		_IOW('f', 8,struct ext4_new_group_input)
#define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)

/*
 * Structure of an inode on the disk
 */
struct ext2_inode {
/*00*/	__u16	i_mode;		/* File mode */
	__u16	i_uid;		/* Low 16 bits of Owner Uid */
	__u32	i_size;		/* Size in bytes */
	__u32	i_atime;	/* Access time */
	__u32	i_ctime;	/* Inode change time */
/*10*/	__u32	i_mtime;	/* Modification time */
	__u32	i_dtime;	/* Deletion Time */
	__u16	i_gid;		/* Low 16 bits of Group Id */
	__u16	i_links_count;	/* Links count */
	__u32	i_blocks;	/* Blocks count */
/*20*/	__u32	i_flags;	/* File flags */
	union {
		struct {
			__u32	l_i_version; /* was l_i_reserved1 */
		} linux1;
		struct {
			__u32  h_i_translator;
		} hurd1;
	} osd1;				/* OS dependent 1 */
/*28*/	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
/*64*/	__u32	i_generation;	/* File version (for NFS) */
	__u32	i_file_acl;	/* File ACL */
	__u32	i_size_high;
/*70*/	__u32	i_faddr;	/* Fragment address */
	union {
		struct {
			__u16	l_i_blocks_hi;
			__u16	l_i_file_acl_high;
			__u16	l_i_uid_high;	/* these 2 fields    */
			__u16	l_i_gid_high;	/* were reserved2[0] */
			__u16	l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
			__u16	l_i_reserved;
		} linux2;
		struct {
			__u8	h_i_frag;	/* Fragment number */
			__u8	h_i_fsize;	/* Fragment size */
			__u16	h_i_mode_high;
			__u16	h_i_uid_high;
			__u16	h_i_gid_high;
			__u32	h_i_author;
		} hurd2;
	} osd2;				/* OS dependent 2 */
};

/*
 * Permanent part of an large inode on the disk
 */
struct ext2_inode_large {
/*00*/	__u16	i_mode;		/* File mode */
	__u16	i_uid;		/* Low 16 bits of Owner Uid */
	__u32	i_size;		/* Size in bytes */
	__u32	i_atime;	/* Access time */
	__u32	i_ctime;	/* Inode Change time */
/*10*/	__u32	i_mtime;	/* Modification time */
	__u32	i_dtime;	/* Deletion Time */
	__u16	i_gid;		/* Low 16 bits of Group Id */
	__u16	i_links_count;	/* Links count */
	__u32	i_blocks;	/* Blocks count */
/*20*/	__u32	i_flags;	/* File flags */
	union {
		struct {
			__u32	l_i_version; /* was l_i_reserved1 */
		} linux1;
		struct {
			__u32  h_i_translator;
		} hurd1;
	} osd1;				/* OS dependent 1 */
/*28*/	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
/*64*/	__u32	i_generation;	/* File version (for NFS) */
	__u32	i_file_acl;	/* File ACL */
	__u32	i_size_high;
/*70*/	__u32	i_faddr;	/* Fragment address */
	union {
		struct {
			__u16	l_i_blocks_hi;
			__u16	l_i_file_acl_high;
			__u16	l_i_uid_high;	/* these 2 fields    */
			__u16	l_i_gid_high;	/* were reserved2[0] */
			__u16	l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
			__u16	l_i_reserved;
		} linux2;
		struct {
			__u8	h_i_frag;	/* Fragment number */
			__u8	h_i_fsize;	/* Fragment size */
			__u16	h_i_mode_high;
			__u16	h_i_uid_high;
			__u16	h_i_gid_high;
			__u32	h_i_author;
		} hurd2;
	} osd2;				/* OS dependent 2 */
/*80*/	__u16	i_extra_isize;
	__u16	i_checksum_hi;	/* crc32c(uuid+inum+inode) */
	__u32	i_ctime_extra;	/* extra Change time (nsec << 2 | epoch) */
	__u32	i_mtime_extra;	/* extra Modification time (nsec << 2 | epoch) */
	__u32	i_atime_extra;	/* extra Access time (nsec << 2 | epoch) */
/*90*/	__u32	i_crtime;	/* File creation time */
	__u32	i_crtime_extra;	/* extra File creation time (nsec << 2 | epoch)*/
	__u32	i_version_hi;	/* high 32 bits for 64-bit version */
/*9c*/	__u32   i_projid;       /* Project ID */
};

#define EXT4_INODE_CSUM_HI_EXTRA_END	\
	(offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \
	 EXT2_GOOD_OLD_INODE_SIZE)

#define EXT4_EPOCH_BITS 2
#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)

#define i_checksum_lo	osd2.linux2.l_i_checksum_lo

#define inode_includes(size, field)			\
       (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \
                 offsetof(struct ext2_inode_large, field)))

#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1	osd1.linux1.l_i_reserved1
#define i_frag		osd2.linux2.l_i_frag
#define i_fsize		osd2.linux2.l_i_fsize
#define i_uid_low	i_uid
#define i_gid_low	i_gid
#define i_uid_high	osd2.linux2.l_i_uid_high
#define i_gid_high	osd2.linux2.l_i_gid_high
#else
#if defined(__GNU__)

#define i_translator	osd1.hurd1.h_i_translator
#define i_frag		osd2.hurd2.h_i_frag;
#define i_fsize		osd2.hurd2.h_i_fsize;
#define i_uid_high	osd2.hurd2.h_i_uid_high
#define i_gid_high	osd2.hurd2.h_i_gid_high
#define i_author	osd2.hurd2.h_i_author

#endif  /* __GNU__ */
#endif	/* defined(__KERNEL__) || defined(__linux__) */

#define inode_uid(inode)	((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
#define inode_gid(inode)	((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
#define inode_projid(inode)	((inode).i_projid)
#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))

static inline
struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode)
{
	return (struct ext2_inode *) large_inode;
}

/*
 * File system states
 */
#define EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
#define EXT2_ERROR_FS			0x0002	/* Errors detected */
#define EXT3_ORPHAN_FS			0x0004	/* Orphans being recovered */

/*
 * Misc. filesystem flags
 */
#define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
#define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
#define EXT2_FLAGS_TEST_FILESYS		0x0004	/* OK for use on development code */
#define EXT2_FLAGS_IS_SNAPSHOT		0x0010	/* This is a snapshot image */
#define EXT2_FLAGS_FIX_SNAPSHOT		0x0020	/* Snapshot inodes corrupted */
#define EXT2_FLAGS_FIX_EXCLUDE		0x0040	/* Exclude bitmaps corrupted */

/*
 * Mount flags
 */
#define EXT2_MOUNT_CHECK		0x0001	/* Do mount-time checks */
#define EXT2_MOUNT_GRPID		0x0004	/* Create files with directory's group */
#define EXT2_MOUNT_DEBUG		0x0008	/* Some debugging messages */
#define EXT2_MOUNT_ERRORS_CONT		0x0010	/* Continue on errors */
#define EXT2_MOUNT_ERRORS_RO		0x0020	/* Remount fs ro on errors */
#define EXT2_MOUNT_ERRORS_PANIC		0x0040	/* Panic on errors */
#define EXT2_MOUNT_MINIX_DF		0x0080	/* Mimics the Minix statfs */
#define EXT2_MOUNT_NO_UID32		0x0200  /* Disable 32-bit UIDs */

#define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt)			o |= EXT2_MOUNT_##opt
#define test_opt(sb, opt)		(EXT2_SB(sb)->s_mount_opt & \
					 EXT2_MOUNT_##opt)
/*
 * Maximal mount counts between two filesystem checks
 */
#define EXT2_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
#define EXT2_DFL_CHECKINTERVAL		0	/* Don't use interval check */

/*
 * 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

#if (__GNUC__ >= 4)
#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
#else
#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif

/* Metadata checksum algorithms */
#define EXT2_CRC32C_CHKSUM		1

/* Encryption algorithms, key size and key reference len */
#define EXT4_ENCRYPTION_MODE_INVALID		0
#define EXT4_ENCRYPTION_MODE_AES_256_XTS	1
#define EXT4_ENCRYPTION_MODE_AES_256_GCM	2
#define EXT4_ENCRYPTION_MODE_AES_256_CBC	3
#define EXT4_ENCRYPTION_MODE_AES_256_CTS	4

#define EXT4_AES_256_XTS_KEY_SIZE		64
#define EXT4_AES_256_GCM_KEY_SIZE		32
#define EXT4_AES_256_CBC_KEY_SIZE		32
#define EXT4_AES_256_CTS_KEY_SIZE		32
#define EXT4_MAX_KEY_SIZE			64

#define EXT4_KEY_DESCRIPTOR_SIZE		8
#define EXT4_CRYPTO_BLOCK_SIZE			16

/* Password derivation constants */
#define EXT4_MAX_PASSPHRASE_SIZE		1024
#define EXT4_MAX_SALT_SIZE			256
#define EXT4_PBKDF2_ITERATIONS			0xFFFF

#define EXT2_LABEL_LEN				16

/*
 * Policy provided via an ioctl on the topmost directory. This
 * structure is also in the kernel.
 */
struct ext4_encryption_policy {
  char version;
  char contents_encryption_mode;
  char filenames_encryption_mode;
  char flags;
  char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
} __attribute__((__packed__));

struct ext4_encryption_key {
        __u32 mode;
        char raw[EXT4_MAX_KEY_SIZE];
        __u32 size;
} __attribute__((__packed__));

/*
 * Structure of the super block
 */
struct ext2_super_block {
/*000*/	__u32	s_inodes_count;		/* Inodes count */
	__u32	s_blocks_count;		/* Blocks count */
	__u32	s_r_blocks_count;	/* Reserved blocks count */
	__u32	s_free_blocks_count;	/* Free blocks count */
/*010*/	__u32	s_free_inodes_count;	/* Free inodes count */
	__u32	s_first_data_block;	/* First Data Block */
	__u32	s_log_block_size;	/* Block size */
	__u32	s_log_cluster_size;	/* Allocation cluster size */
/*020*/	__u32	s_blocks_per_group;	/* # Blocks per group */
	__u32	s_clusters_per_group;	/* # Fragments per group */
	__u32	s_inodes_per_group;	/* # Inodes per group */
	__u32	s_mtime;		/* Mount time */
/*030*/	__u32	s_wtime;		/* Write time */
	__u16	s_mnt_count;		/* Mount count */
	__s16	s_max_mnt_count;	/* Maximal mount count */
	__u16	s_magic;		/* Magic signature */
	__u16	s_state;		/* File system state */
	__u16	s_errors;		/* Behaviour when detecting errors */
	__u16	s_minor_rev_level;	/* minor revision level */
/*040*/	__u32	s_lastcheck;		/* time of last check */
	__u32	s_checkinterval;	/* max. time between checks */
	__u32	s_creator_os;		/* OS */
	__u32	s_rev_level;		/* Revision level */
/*050*/	__u16	s_def_resuid;		/* Default uid for reserved blocks */
	__u16	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 filesystem.
	 *
	 * 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...
	 */
	__u32	s_first_ino;		/* First non-reserved inode */
	__u16   s_inode_size;		/* size of inode structure */
	__u16	s_block_group_nr;	/* block group # of this superblock */
	__u32	s_feature_compat;	/* compatible feature set */
/*060*/	__u32	s_feature_incompat;	/* incompatible feature set */
	__u32	s_feature_ro_compat;	/* readonly-compatible feature set */
/*068*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
/*078*/	__u8	s_volume_name[EXT2_LABEL_LEN];	/* volume name, no NUL? */
/*088*/	__u8	s_last_mounted[64];	/* directory last mounted on, no NUL? */
/*0c8*/	__u32	s_algorithm_usage_bitmap; /* For compression */
	/*
	 * Performance hints.  Directory preallocation should only
	 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
	 */
	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
	__u16	s_reserved_gdt_blocks;	/* Per group table for online growth */
	/*
	 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
	 */
/*0d0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
/*0e0*/	__u32	s_journal_inum;		/* inode number of journal file */
	__u32	s_journal_dev;		/* device number of journal file */
	__u32	s_last_orphan;		/* start of list of inodes to delete */
/*0ec*/	__u32	s_hash_seed[4];		/* HTREE hash seed */
/*0fc*/	__u8	s_def_hash_version;	/* Default hash version to use */
	__u8	s_jnl_backup_type;	/* Default type of journal backup */
	__u16	s_desc_size;		/* Group desc. size: INCOMPAT_64BIT */
/*100*/	__u32	s_default_mount_opts;	/* default EXT2_MOUNT_* flags used */
	__u32	s_first_meta_bg;	/* First metablock group */
	__u32	s_mkfs_time;		/* When the filesystem was created */
/*10c*/	__u32	s_jnl_blocks[17];	/* Backup of the journal inode */
/*150*/	__u32	s_blocks_count_hi;	/* Blocks count high 32bits */
	__u32	s_r_blocks_count_hi;	/* Reserved blocks count high 32 bits*/
	__u32	s_free_blocks_hi;	/* Free blocks count */
	__u16	s_min_extra_isize;	/* All inodes have at least # bytes */
	__u16	s_want_extra_isize;	/* New inodes should reserve # bytes */
/*160*/	__u32	s_flags;		/* Miscellaneous flags */
	__u16	s_raid_stride;		/* RAID stride in blocks */
	__u16	s_mmp_update_interval;  /* # seconds to wait in MMP checking */
	__u64	s_mmp_block;		/* Block for multi-mount protection */
/*170*/	__u32	s_raid_stripe_width;	/* blocks on all data disks (N*stride)*/
	__u8	s_log_groups_per_flex;	/* FLEX_BG group size */
	__u8	s_checksum_type;	/* metadata checksum algorithm */
	__u8	s_encryption_level;	/* versioning level for encryption */
	__u8	s_reserved_pad;		/* Padding to next 32bits */
	__u64	s_kbytes_written;	/* nr of lifetime kilobytes written */
/*180*/	__u32	s_snapshot_inum;	/* Inode number of active snapshot */
	__u32	s_snapshot_id;		/* sequential ID of active snapshot */
	__u64	s_snapshot_r_blocks_count; /* active snapshot reserved blocks */
/*190*/	__u32	s_snapshot_list;	/* inode number of disk snapshot list */
#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
	__u32	s_error_count;		/* number of fs errors */
	__u32	s_first_error_time;	/* first time an error happened */
	__u32	s_first_error_ino;	/* inode involved in first error */
/*1a0*/	__u64	s_first_error_block;	/* block involved in first error */
	__u8	s_first_error_func[32];	/* function where error hit, no NUL? */
/*1c8*/	__u32	s_first_error_line;	/* line number where error happened */
	__u32	s_last_error_time;	/* most recent time of an error */
/*1d0*/	__u32	s_last_error_ino;	/* inode involved in last error */
	__u32	s_last_error_line;	/* line number where error happened */
	__u64	s_last_error_block;	/* block involved of last error */
/*1e0*/	__u8	s_last_error_func[32];	/* function where error hit, no NUL? */
#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
/*200*/	__u8	s_mount_opts[64];	/* default mount options, no NUL? */
/*240*/	__u32	s_usr_quota_inum;	/* inode number of user quota file */
	__u32	s_grp_quota_inum;	/* inode number of group quota file */
	__u32	s_overhead_blocks;	/* overhead blocks/clusters in fs */
/*24c*/	__u32	s_backup_bgs[2];	/* If sparse_super2 enabled */
/*254*/	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
/*258*/	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
/*268*/	__le32	s_lpf_ino;		/* Location of the lost+found inode */
	__le32  s_prj_quota_inum;	/* inode for tracking project quota */
/*270*/	__le32	s_checksum_seed;	/* crc32c(orig_uuid) if csum_seed set */
/*274*/	__u8	s_wtime_hi;
	__u8	s_mtime_hi;
	__u8	s_mkfs_time_hi;
	__u8	s_lastcheck_hi;
	__u8	s_first_error_time_hi;
	__u8	s_last_error_time_hi;
	__u8	s_pad[2];
/*27c*/ __le16	s_encoding;		/* Filename charset encoding */
	__le16	s_encoding_flags;	/* Filename charset encoding flags */
	__le32	s_reserved[95];		/* Padding to the end of the block */
/*3fc*/	__u32	s_checksum;		/* crc32c(superblock) */
};

#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
#define EXT2_LEN_STR(buf) (int)sizeof(buf), (char *)buf

/*
 * Codes for operating systems
 */
#define EXT2_OS_LINUX		0
#define EXT2_OS_HURD		1
#define EXT2_OBSO_OS_MASIX	2
#define EXT2_OS_FREEBSD		3
#define EXT2_OS_LITES		4

/*
 * Revision levels
 */
#define EXT2_GOOD_OLD_REV	0	/* The good old (original) format */
#define EXT2_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */

#define EXT2_CURRENT_REV	EXT2_GOOD_OLD_REV
#define EXT2_MAX_SUPP_REV	EXT2_DYNAMIC_REV

#define EXT2_GOOD_OLD_INODE_SIZE 128

/*
 * Journal inode backup types
 */
#define EXT3_JNL_BACKUP_BLOCKS	1

/*
 * Feature set definitions
 */

#define EXT2_HAS_COMPAT_FEATURE(sb,mask)			\
	( EXT2_SB(sb)->s_feature_compat & (mask) )
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)			\
	( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)			\
	( EXT2_SB(sb)->s_feature_incompat & (mask) )

#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001
#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004
#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008
#define EXT2_FEATURE_COMPAT_RESIZE_INODE	0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
#define EXT2_FEATURE_COMPAT_LAZY_BG		0x0040
/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE	0x0080 not used, legacy */
#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP	0x0100
#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2	0x0200
#define EXT4_FEATURE_COMPAT_FAST_COMMIT		0x0400

#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004 not used */
#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 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT	0x0080
#define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
#define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200
/*
 * METADATA_CSUM implies GDT_CSUM.  When METADATA_CSUM is set, group
 * descriptor checksums use the same algorithm as all other data
 * structures' checksums.
 */
#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM	0x0400
#define EXT4_FEATURE_RO_COMPAT_REPLICA		0x0800
#define EXT4_FEATURE_RO_COMPAT_READONLY		0x1000
#define EXT4_FEATURE_RO_COMPAT_PROJECT		0x2000 /* Project quota */
#define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS	0x4000
#define EXT4_FEATURE_RO_COMPAT_VERITY		0x8000

#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */
#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
#define EXT3_FEATURE_INCOMPAT_EXTENTS		0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
#define EXT4_FEATURE_INCOMPAT_MMP		0x0100
#define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE		0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA		0x1000
#define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
#define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
#define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
#define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
#define EXT4_FEATURE_INCOMPAT_CASEFOLD		0x20000

#define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \
static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
{ \
	return ((EXT2_SB(sb)->s_feature_compat & \
		 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \
} \
static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_compat |= \
		EXT##ver##_FEATURE_COMPAT_##flagname; \
} \
static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_compat &= \
		~EXT##ver##_FEATURE_COMPAT_##flagname; \
}

#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \
static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
{ \
	return ((EXT2_SB(sb)->s_feature_ro_compat & \
		 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \
} \
static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_ro_compat |= \
		EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
} \
static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_ro_compat &= \
		~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \
}

#define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \
static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \
{ \
	return ((EXT2_SB(sb)->s_feature_incompat & \
		 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \
} \
static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_incompat |= \
		EXT##ver##_FEATURE_INCOMPAT_##flagname; \
} \
static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \
{ \
	EXT2_SB(sb)->s_feature_incompat &= \
		~EXT##ver##_FEATURE_INCOMPAT_##flagname; \
}

EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,		2, DIR_PREALLOC)
EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,	2, IMAGIC_INODES)
EXT4_FEATURE_COMPAT_FUNCS(journal,		3, HAS_JOURNAL)
EXT4_FEATURE_COMPAT_FUNCS(xattr,		2, EXT_ATTR)
EXT4_FEATURE_COMPAT_FUNCS(resize_inode,		2, RESIZE_INODE)
EXT4_FEATURE_COMPAT_FUNCS(dir_index,		2, DIR_INDEX)
EXT4_FEATURE_COMPAT_FUNCS(lazy_bg,		2, LAZY_BG)
EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap,	2, EXCLUDE_BITMAP)
EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,	4, SPARSE_SUPER2)
EXT4_FEATURE_COMPAT_FUNCS(fast_commit,		4, FAST_COMMIT)

EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,	2, SPARSE_SUPER)
EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,	2, LARGE_FILE)
EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,		4, HUGE_FILE)
EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,		4, GDT_CSUM)
EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,		4, DIR_NLINK)
EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,	4, EXTRA_ISIZE)
EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot,	4, HAS_SNAPSHOT)
EXT4_FEATURE_RO_COMPAT_FUNCS(quota,		4, QUOTA)
EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,		4, BIGALLOC)
EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,	4, METADATA_CSUM)
EXT4_FEATURE_RO_COMPAT_FUNCS(replica,		4, REPLICA)
EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,		4, READONLY)
EXT4_FEATURE_RO_COMPAT_FUNCS(project,		4, PROJECT)
EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks,	4, SHARED_BLOCKS)
EXT4_FEATURE_RO_COMPAT_FUNCS(verity,		4, VERITY)

EXT4_FEATURE_INCOMPAT_FUNCS(compression,	2, COMPRESSION)
EXT4_FEATURE_INCOMPAT_FUNCS(filetype,		2, FILETYPE)
EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,	3, RECOVER)
EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,	3, JOURNAL_DEV)
EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,		2, META_BG)
EXT4_FEATURE_INCOMPAT_FUNCS(extents,		3, EXTENTS)
EXT4_FEATURE_INCOMPAT_FUNCS(64bit,		4, 64BIT)
EXT4_FEATURE_INCOMPAT_FUNCS(mmp,		4, MMP)
EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,		4, FLEX_BG)
EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,		4, EA_INODE)
EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,		4, DIRDATA)
EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,		4, CSUM_SEED)
EXT4_FEATURE_INCOMPAT_FUNCS(largedir,		4, LARGEDIR)
EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,	4, INLINE_DATA)
EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,		4, ENCRYPT)
EXT4_FEATURE_INCOMPAT_FUNCS(casefold,		4, CASEFOLD)

#define EXT2_FEATURE_COMPAT_SUPP	0
#define EXT2_FEATURE_INCOMPAT_SUPP    (EXT2_FEATURE_INCOMPAT_FILETYPE| \
				       EXT4_FEATURE_INCOMPAT_MMP| \
				       EXT4_FEATURE_INCOMPAT_LARGEDIR| \
				       EXT4_FEATURE_INCOMPAT_EA_INODE)
#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \
					 EXT4_FEATURE_RO_COMPAT_VERITY)

/*
 * Default values for user and/or group using reserved blocks
 */
#define EXT2_DEF_RESUID		0
#define EXT2_DEF_RESGID		0

/*
 * Default mount options
 */
#define EXT2_DEFM_DEBUG		0x0001
#define EXT2_DEFM_BSDGROUPS	0x0002
#define EXT2_DEFM_XATTR_USER	0x0004
#define EXT2_DEFM_ACL		0x0008
#define EXT2_DEFM_UID16		0x0010
#define EXT3_DEFM_JMODE		0x0060
#define EXT3_DEFM_JMODE_DATA	0x0020
#define EXT3_DEFM_JMODE_ORDERED	0x0040
#define EXT3_DEFM_JMODE_WBACK	0x0060
#define EXT4_DEFM_NOBARRIER	0x0100
#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
#define EXT4_DEFM_DISCARD	0x0400
#define EXT4_DEFM_NODELALLOC	0x0800

/*
 * Structure of a directory entry
 */
#define EXT2_NAME_LEN 255

struct ext2_dir_entry {
	__u32	inode;			/* Inode number */
	__u16	rec_len;		/* Directory entry length */
	__u16	name_len;		/* Name length */
	char	name[EXT2_NAME_LEN];	/* File name */
};

/*
 * The new version of the directory entry.  Since EXT2 structures are
 * stored in intel byte order, and the name_len field could never be
 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 * file_type field.
 *
 * This structure is deprecated due to endian issues. Please use struct
 * ext2_dir_entry and accessor functions
 *   ext2fs_dirent_name_len
 *   ext2fs_dirent_set_name_len
 *   ext2fs_dirent_file_type
 *   ext2fs_dirent_set_file_type
 * to get and set name_len and file_type fields.
 */
struct ext2_dir_entry_2 {
	__u32	inode;			/* Inode number */
	__u16	rec_len;		/* Directory entry length */
	__u8	name_len;		/* Name length */
	__u8	file_type;
	char	name[EXT2_NAME_LEN];	/* File name */
};

/*
 * This is a bogus directory entry at the end of each leaf block that
 * records checksums.
 */
struct ext2_dir_entry_tail {
	__u32	det_reserved_zero1;	/* Pretend to be unused */
	__u16	det_rec_len;		/* 12 */
	__u16	det_reserved_name_len;	/* 0xDE00, fake namelen/filetype */
	__u32	det_checksum;		/* crc32c(uuid+inode+dirent) */
};

/*
 * 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

#define EXT2_FT_MAX		8

/*
 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we
 * have to build ext2_dir_entry_tail with that assumption too.  This
 * constant helps to build the dir_entry_tail to look like it has an
 * "invalid" file type.
 */
#define EXT2_DIR_NAME_LEN_CSUM	0xDE00

/*
 * EXT2_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define EXT2_DIR_ENTRY_HEADER_LEN	8
#define EXT2_DIR_PAD			4
#define EXT2_DIR_ROUND			(EXT2_DIR_PAD - 1)
#define EXT2_DIR_REC_LEN(name_len)	(((name_len) + \
					  EXT2_DIR_ENTRY_HEADER_LEN + \
					  EXT2_DIR_ROUND) & \
					 ~EXT2_DIR_ROUND)

/*
 * Constants for ext4's extended time encoding
 */
#define EXT4_EPOCH_BITS 2
#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
#define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)

/*
 * This structure is used for multiple mount protection. It is written
 * into the block number saved in the s_mmp_block field in the superblock.
 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown
 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
 * regardless of how old the timestamp is.
 *
 * The timestamp in the MMP structure will be updated by e2fsck at some
 * arbitrary intervals (start of passes, after every few groups of inodes
 * in pass1 and pass1b).  There is no guarantee that e2fsck is updating
 * the MMP block in a timely manner, and the updates it does are purely
 * for the convenience of the sysadmin and not for automatic validation.
 *
 * Note: Only the mmp_seq value is used to determine whether the MMP block
 *	is being updated.  The mmp_time, mmp_nodename, and mmp_bdevname
 *	fields are only for informational purposes for the administrator,
 *	due to clock skew between nodes and hostname HA service takeover.
 */
#define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
#define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
#define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */

/* Not endian-annotated; it's swapped at read/write time */
struct mmp_struct {
	__u32	mmp_magic;		/* Magic number for MMP */
	__u32	mmp_seq;		/* Sequence no. updated periodically */
	__u64	mmp_time;		/* Time last updated (seconds) */
	__u8	mmp_nodename[64];	/* Node updating MMP block, no NUL? */
	__u8	mmp_bdevname[32];	/* Bdev updating MMP block, no NUL? */
	__u16	mmp_check_interval;	/* Changed mmp_check_interval */
	__u16	mmp_pad1;
	__u32	mmp_pad2[226];
	__u32	mmp_checksum;		/* crc32c(uuid+mmp_block) */
};

/*
 * Default interval for MMP update in seconds.
 */
#define EXT4_MMP_UPDATE_INTERVAL	5

/*
 * Maximum interval for MMP update in seconds.
 */
#define EXT4_MMP_MAX_UPDATE_INTERVAL	300

/*
 * Minimum interval for MMP checking in seconds.
 */
#define EXT4_MMP_MIN_CHECK_INTERVAL     5

/*
 * Minimum size of inline data.
 */
#define EXT4_MIN_INLINE_DATA_SIZE	((sizeof(__u32) * EXT2_N_BLOCKS))

/*
 * Size of a parent inode in inline data directory.
 */
#define EXT4_INLINE_DATA_DOTDOT_SIZE	(4)

#define EXT4_ENC_UTF8_12_1	1

#define EXT4_ENC_STRICT_MODE_FL			(1 << 0) /* Reject invalid sequences */

#endif	/* _LINUX_EXT2_FS_H */

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