| /* |
| * 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 */ |
| |
| /* |
| * 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 EXT2_ACL_IDX_INO 3 /* ACL inode */ |
| #define EXT2_ACL_DATA_INO 4 /* ACL inode */ |
| #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| #define EXT2_JOURNAL_INO 8 /* Journal inode */ |
| |
| /* 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 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 |
| #ifdef __KERNEL__ |
| # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) |
| # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) |
| #else |
| # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) |
| # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) |
| #endif |
| |
| /* |
| * 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_reserved[2]; |
| __u16 bg_itable_unused; /* Unused inodes count */ |
| __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ |
| }; |
| |
| 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; |
| __u32 bg_reserved[2]; |
| __u16 bg_itable_unused; /* Unused inodes count */ |
| __u16 bg_checksum; /* crc16(s_uuid+grouo_num+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_pad; |
| __u32 bg_reserved2[3]; |
| }; |
| |
| #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 |
| |
| struct ext2_dx_entry { |
| __u32 hash; |
| __u32 block; |
| }; |
| |
| struct ext2_dx_countlimit { |
| __u16 limit; |
| __u16 count; |
| }; |
| |
| |
| /* |
| * 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_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) ((1 << 16) - 8) |
| #define EXT2_MAX_INODES_PER_GROUP(s) ((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 |
| |
| /* |
| * 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 */ |
| #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ |
| /* 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_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
| #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| |
| #define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
| #define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* 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) |
| |
| /* |
| * Structure of an inode on the disk |
| */ |
| struct ext2_inode { |
| __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 */ |
| __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 */ |
| __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 */ |
| __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
| __u32 i_generation; /* File version (for NFS) */ |
| __u32 i_file_acl; /* File ACL */ |
| __u32 i_dir_acl; /* Directory ACL */ |
| __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] */ |
| __u32 l_i_reserved2; |
| } 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 { |
| __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 */ |
| __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 */ |
| __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 */ |
| __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
| __u32 i_generation; /* File version (for NFS) */ |
| __u32 i_file_acl; /* File ACL */ |
| __u32 i_dir_acl; /* Directory ACL */ |
| __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] */ |
| __u32 l_i_reserved2; |
| } 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 */ |
| __u16 i_extra_isize; |
| __u16 i_pad1; |
| __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) */ |
| __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 */ |
| }; |
| |
| #define i_size_high i_dir_acl |
| |
| #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 |
| #define i_reserved2 osd2.linux2.l_i_reserved2 |
| #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 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)) |
| |
| /* |
| * 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 */ |
| |
| /* |
| * 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 |
| |
| /* |
| * Structure of the super block |
| */ |
| struct ext2_super_block { |
| __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 */ |
| __u32 s_free_inodes_count; /* Free inodes count */ |
| __u32 s_first_data_block; /* First Data Block */ |
| __u32 s_log_block_size; /* Block size */ |
| __s32 s_log_frag_size; /* Fragment size */ |
| __u32 s_blocks_per_group; /* # Blocks per group */ |
| __u32 s_frags_per_group; /* # Fragments per group */ |
| __u32 s_inodes_per_group; /* # Inodes per group */ |
| __u32 s_mtime; /* Mount time */ |
| __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 */ |
| __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 */ |
| __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 */ |
| __u32 s_feature_incompat; /* incompatible feature set */ |
| __u32 s_feature_ro_compat; /* readonly-compatible feature set */ |
| __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
| char s_volume_name[16]; /* volume name */ |
| char s_last_mounted[64]; /* directory where last mounted */ |
| __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. |
| */ |
| __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
| __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 */ |
| __u32 s_hash_seed[4]; /* HTREE hash seed */ |
| __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 */ |
| __u32 s_default_mount_opts; |
| __u32 s_first_meta_bg; /* First metablock group */ |
| __u32 s_mkfs_time; /* When the filesystem was created */ |
| __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
| __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 */ |
| __u32 s_flags; /* Miscellaneous flags */ |
| __u16 s_raid_stride; /* RAID stride */ |
| __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ |
| __u64 s_mmp_block; /* Block for multi-mount protection */ |
| __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
| __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
| __u8 s_reserved_char_pad; |
| __u16 s_reserved_pad; /* Padding to next 32bits */ |
| __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
| __u32 s_reserved[160]; /* Padding to the end of the block */ |
| }; |
| |
| /* |
| * 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_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 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 EXT2_FEATURE_COMPAT_SUPP 0 |
| #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) |
| #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) |
| |
| /* |
| * 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 |
| |
| /* |
| * 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. |
| */ |
| 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 */ |
| }; |
| |
| /* |
| * 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 |
| |
| /* |
| * EXT2_DIR_PAD defines the directory entries boundaries |
| * |
| * NOTE: It must be a multiple of 4 |
| */ |
| #define EXT2_DIR_PAD 4 |
| #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) |
| #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ |
| ~EXT2_DIR_ROUND) |
| |
| /* |
| * This structure will be used for multiple mount protection. It will be |
| * written into the block number saved in the s_mmp_block field in the |
| * superblock. |
| */ |
| #define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ |
| #define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ |
| #define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ |
| |
| struct mmp_struct { |
| __u32 mmp_magic; |
| __u32 mmp_seq; |
| __u64 mmp_time; |
| char mmp_nodename[64]; |
| char mmp_bdevname[32]; |
| __u16 mmp_interval; |
| __u16 mmp_pad1; |
| __u32 mmp_pad2; |
| }; |
| |
| /* |
| * Interval in number of seconds to update the MMP sequence number. |
| */ |
| #define EXT2_MMP_DEF_INTERVAL 5 |
| |
| #endif /* _LINUX_EXT2_FS_H */ |
