| /* |
| * 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 <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 |
| |
| /* |
| * The second extended file system version |
| */ |
| #define EXT2FS_DATE "95/08/09" |
| #define EXT2FS_VERSION "0.5b" |
| |
| /* |
| * Debug code |
| */ |
| #if 0 |
| #ifdef EXT2FS_DEBUG |
| # define ext2_debug(f, a...) { \ |
| printk ("EXT2-fs DEBUG (%s, %d): %s:", \ |
| __FILE__, __LINE__, __FUNCTION__); \ |
| printk (f, ## a); \ |
| } |
| #else |
| # define ext2_debug(f, a...) /**/ |
| #endif |
| #endif |
| |
| /* |
| * Special inodes numbers |
| */ |
| #define EXT2_BAD_INO 1 /* Bad blocks inode */ |
| #define EXT2_ROOT_INO 2 /* Root inode */ |
| #define EXT2_ACL_IDX_INO 3 /* ACL inode */ |
| #define EXT2_ACL_DATA_INO 4 /* ACL inode */ |
| #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| |
| /* 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 |
| |
| /* |
| * Maximal count of links to a file |
| */ |
| #define EXT2_LINK_MAX 32000 |
| |
| /* |
| * Macro-instructions used to manage several block sizes |
| */ |
| #define EXT2_MIN_BLOCK_SIZE 1024 |
| #define EXT2_MAX_BLOCK_SIZE 4096 |
| #define EXT2_MIN_BLOCK_LOG_SIZE 10 |
| #ifdef __KERNEL__ |
| # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) |
| #else |
| # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
| #endif |
| #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry)) |
| #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) |
| #ifdef __KERNEL__ |
| # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
| #else |
| # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
| #endif |
| #ifdef __KERNEL__ |
| #define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits) |
| #define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size) |
| #define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino) |
| #else |
| #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 |
| |
| /* |
| * Macro-instructions used to manage fragments |
| */ |
| #define EXT2_MIN_FRAG_SIZE 1024 |
| #define EXT2_MAX_FRAG_SIZE 4096 |
| #define EXT2_MIN_FRAG_LOG_SIZE 10 |
| #ifdef __KERNEL__ |
| # define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size) |
| # define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.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_pad; |
| __u32 bg_reserved[3]; |
| }; |
| |
| /* |
| * Macro-instructions used to manage group descriptors |
| */ |
| #ifdef __KERNEL__ |
| # define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group) |
| # define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block) |
| # define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group) |
| # define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits) |
| #else |
| # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
| # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) |
| # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
| #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 */ |
| #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| |
| /* |
| * ioctl commands |
| */ |
| #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) |
| |
| /* |
| * Structure of an inode on the disk |
| */ |
| struct ext2_inode { |
| __u16 i_mode; /* File mode */ |
| __u16 i_uid; /* Owner Uid */ |
| __u32 i_size; /* Size in bytes */ |
| __u32 i_atime; /* Access time */ |
| __u32 i_ctime; /* Creation time */ |
| __u32 i_mtime; /* Modification time */ |
| __u32 i_dtime; /* Deletion Time */ |
| __u16 i_gid; /* Group Id */ |
| __u16 i_links_count; /* Links count */ |
| __u32 i_blocks; /* Blocks count */ |
| __u32 i_flags; /* File flags */ |
| union { |
| struct { |
| __u32 l_i_reserved1; |
| } linux1; |
| struct { |
| __u32 h_i_translator; |
| } hurd1; |
| struct { |
| __u32 m_i_reserved1; |
| } masix1; |
| } osd1; /* OS dependent 1 */ |
| __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
| __u32 i_version; /* File version (for NFS) */ |
| __u32 i_file_acl; /* File ACL */ |
| __u32 i_dir_acl; /* Directory ACL */ |
| __u32 i_faddr; /* Fragment address */ |
| union { |
| struct { |
| __u8 l_i_frag; /* Fragment number */ |
| __u8 l_i_fsize; /* Fragment size */ |
| __u16 i_pad1; |
| __u32 l_i_reserved2[2]; |
| } 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; |
| struct { |
| __u8 m_i_frag; /* Fragment number */ |
| __u8 m_i_fsize; /* Fragment size */ |
| __u16 m_pad1; |
| __u32 m_i_reserved2[2]; |
| } masix2; |
| } osd2; /* OS dependent 2 */ |
| }; |
| |
| #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_reserved2 osd2.linux2.l_i_reserved2 |
| #endif |
| |
| #ifdef __hurd__ |
| #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 |
| |
| #ifdef __masix__ |
| #define i_reserved1 osd1.masix1.m_i_reserved1 |
| #define i_frag osd2.masix2.m_i_frag |
| #define i_fsize osd2.masix2.m_i_fsize |
| #define i_reserved2 osd2.masix2.m_i_reserved2 |
| #endif |
| |
| /* |
| * File system states |
| */ |
| #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ |
| #define EXT2_ERROR_FS 0x0002 /* Errors detected */ |
| |
| /* |
| * Mount flags |
| */ |
| #define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */ |
| #define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */ |
| #define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \ |
| EXT2_MOUNT_CHECK_STRICT) |
| #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 clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt |
| #define set_opt(o, opt) o |= EXT2_MOUNT_##opt |
| #define test_opt(sb, opt) ((sb)->u.ext2_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_reserved[206]; /* Padding to the end of the block */ |
| }; |
| |
| /* |
| * Codes for operating systems |
| */ |
| #define EXT2_OS_LINUX 0 |
| #define EXT2_OS_HURD 1 |
| #define EXT2_OS_MASIX 2 |
| #define EXT2_OS_FREEBSD 3 |
| #define EXT2_OS_LITES 4 |
| |
| /* |
| * 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 |
| |
| /* |
| * Feature set definitions |
| */ |
| |
| #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| |
| #define EXT2_FEATURE_COMPAT_SUPP 0 |
| #define EXT2_FEATURE_INCOMPAT_SUPP 0 |
| #define EXT2_FEATURE_RO_COMPAT_SUPP EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER |
| |
| /* |
| * Default values for user and/or group using reserved blocks |
| */ |
| #define EXT2_DEF_RESUID 0 |
| #define EXT2_DEF_RESGID 0 |
| |
| /* |
| * 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 */ |
| }; |
| |
| /* |
| * 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) |
| |
| #ifdef __KERNEL__ |
| /* |
| * Function prototypes |
| */ |
| |
| /* |
| * Ok, these declarations are also in <linux/kernel.h> but none of the |
| * ext2 source programs needs to include it so they are duplicated here. |
| */ |
| #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) |
| # define NORET_TYPE __volatile__ |
| # define ATTRIB_NORET /**/ |
| # define NORET_AND /**/ |
| #else |
| # define NORET_TYPE /**/ |
| # define ATTRIB_NORET __attribute__((noreturn)) |
| # define NORET_AND noreturn, |
| #endif |
| |
| /* acl.c */ |
| extern int ext2_permission (struct inode *, int); |
| |
| /* balloc.c */ |
| extern int ext2_new_block (const struct inode *, unsigned long, |
| __u32 *, __u32 *, int *); |
| extern void ext2_free_blocks (const struct inode *, unsigned long, |
| unsigned long); |
| extern unsigned long ext2_count_free_blocks (struct super_block *); |
| extern void ext2_check_blocks_bitmap (struct super_block *); |
| |
| /* bitmap.c */ |
| extern unsigned long ext2_count_free (struct buffer_head *, unsigned); |
| |
| /* dir.c */ |
| extern int ext2_check_dir_entry (const char *, struct inode *, |
| struct ext2_dir_entry *, struct buffer_head *, |
| unsigned long); |
| |
| /* file.c */ |
| extern int ext2_read (struct inode *, struct file *, char *, int); |
| extern int ext2_write (struct inode *, struct file *, char *, int); |
| |
| /* fsync.c */ |
| extern int ext2_sync_file (struct inode *, struct file *); |
| |
| /* ialloc.c */ |
| extern struct inode * ext2_new_inode (const struct inode *, int, int *); |
| extern void ext2_free_inode (struct inode *); |
| extern unsigned long ext2_count_free_inodes (struct super_block *); |
| extern void ext2_check_inodes_bitmap (struct super_block *); |
| |
| /* inode.c */ |
| extern int ext2_bmap (struct inode *, int); |
| |
| extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *); |
| extern struct buffer_head * ext2_bread (struct inode *, int, int, int *); |
| |
| extern int ext2_getcluster (struct inode * inode, long block); |
| extern void ext2_read_inode (struct inode *); |
| extern void ext2_write_inode (struct inode *); |
| extern void ext2_put_inode (struct inode *); |
| extern int ext2_sync_inode (struct inode *); |
| extern void ext2_discard_prealloc (struct inode *); |
| |
| /* ioctl.c */ |
| extern int ext2_ioctl (struct inode *, struct file *, unsigned int, |
| unsigned long); |
| |
| /* namei.c */ |
| extern void ext2_release (struct inode *, struct file *); |
| extern int ext2_lookup (struct inode *,const char *, int, struct inode **); |
| extern int ext2_create (struct inode *,const char *, int, int, |
| struct inode **); |
| extern int ext2_mkdir (struct inode *, const char *, int, int); |
| extern int ext2_rmdir (struct inode *, const char *, int); |
| extern int ext2_unlink (struct inode *, const char *, int); |
| extern int ext2_symlink (struct inode *, const char *, int, const char *); |
| extern int ext2_link (struct inode *, struct inode *, const char *, int); |
| extern int ext2_mknod (struct inode *, const char *, int, int, int); |
| extern int ext2_rename (struct inode *, const char *, int, |
| struct inode *, const char *, int, int); |
| |
| /* super.c */ |
| extern void ext2_error (struct super_block *, const char *, const char *, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern NORET_TYPE void ext2_panic (struct super_block *, const char *, |
| const char *, ...) |
| __attribute__ ((NORET_AND format (printf, 3, 4))); |
| extern void ext2_warning (struct super_block *, const char *, const char *, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern void ext2_put_super (struct super_block *); |
| extern void ext2_write_super (struct super_block *); |
| extern int ext2_remount (struct super_block *, int *, char *); |
| extern struct super_block * ext2_read_super (struct super_block *,void *,int); |
| extern int init_ext2_fs(void); |
| extern void ext2_statfs (struct super_block *, struct statfs *, int); |
| |
| /* truncate.c */ |
| extern void ext2_truncate (struct inode *); |
| |
| /* |
| * Inodes and files operations |
| */ |
| |
| /* dir.c */ |
| extern struct inode_operations ext2_dir_inode_operations; |
| |
| /* file.c */ |
| extern struct inode_operations ext2_file_inode_operations; |
| |
| /* symlink.c */ |
| extern struct inode_operations ext2_symlink_inode_operations; |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_EXT2_FS_H */ |