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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 */ #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 */