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- /*
- * linux/include/linux/ext2_fs.h
- *
- * Copyright (C) 1992, 1993, 1994 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
-
- /*
- * The second extended filesystem constants/structures
- */
-
- /*
- * Define EXT2FS_DEBUG to produce debug messages
- */
- #undef EXT2FS_DEBUG
-
- /*
- * Define EXT2FS_DEBUG_CACHE to produce cache debug messages
- */
- #undef EXT2FS_DEBUG_CACHE
-
- /*
- * Define EXT2FS_CHECK_CACHE to add some checks to the name cache code
- */
- #undef EXT2FS_CHECK_CACHE
-
- /*
- * Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b
- */
- #undef EXT2FS_PRE_02B_COMPAT
-
- /*
- * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
- */
- #define EXT2_PREALLOCATE
-
- /*
- * The second extended file system version
- */
- #define EXT2FS_DATE "94/10/23"
- #define EXT2FS_VERSION "0.5a"
-
- /*
- * 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 */
- #define EXT2_FIRST_INO 11 /* First non reserved inode */
-
- /*
- * The second extended file system magic number
- */
- #define EXT2_PRE_02B_MAGIC 0xEF51
- #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 (unsigned long))
- #ifdef __KERNEL__
- # define EXT2_BLOCK_SIZE_BITS(s) ((s)->u.ext2_sb.s_es->s_log_block_size + 10)
- #else
- # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
- #endif
- #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))
-
- /*
- * 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 */
- {
- unsigned long aclh_size;
- unsigned long aclh_file_count;
- unsigned long aclh_acle_count;
- unsigned long aclh_first_acle;
- };
-
- struct ext2_acl_entry /* Access Control List Entry */
- {
- unsigned long acle_size;
- unsigned short acle_perms; /* Access permissions */
- unsigned short acle_type; /* Type of entry */
- unsigned short acle_tag; /* User or group identity */
- unsigned short acle_pad1;
- unsigned long acle_next; /* Pointer on next entry for the */
- /* same inode or on next free entry */
- };
-
- /*
- * Structure of a blocks group descriptor
- */
- struct ext2_old_group_desc
- {
- unsigned long bg_block_bitmap; /* Blocks bitmap block */
- unsigned long bg_inode_bitmap; /* Inodes bitmap block */
- unsigned long bg_inode_table; /* Inodes table block */
- unsigned short bg_free_blocks_count; /* Free blocks count */
- unsigned short bg_free_inodes_count; /* Free inodes count */
- };
-
- struct ext2_group_desc
- {
- unsigned long bg_block_bitmap; /* Blocks bitmap block */
- unsigned long bg_inode_bitmap; /* Inodes bitmap block */
- unsigned long bg_inode_table; /* Inodes table block */
- unsigned short bg_free_blocks_count; /* Free blocks count */
- unsigned short bg_free_inodes_count; /* Free inodes count */
- unsigned short bg_used_dirs_count; /* Directories count */
- unsigned short bg_pad;
- unsigned long 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)
- #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 */
-
- /*
- * 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 {
- unsigned short i_mode; /* File mode */
- unsigned short i_uid; /* Owner Uid */
- unsigned long i_size; /* Size in bytes */
- unsigned long i_atime; /* Access time */
- unsigned long i_ctime; /* Creation time */
- unsigned long i_mtime; /* Modification time */
- unsigned long i_dtime; /* Deletion Time */
- unsigned short i_gid; /* Group Id */
- unsigned short i_links_count; /* Links count */
- unsigned long i_blocks; /* Blocks count */
- unsigned long i_flags; /* File flags */
- union {
- struct {
- unsigned long l_i_reserved1;
- } linux1;
- struct {
- unsigned long h_i_translator;
- } hurd1;
- struct {
- unsigned long m_i_reserved1;
- } masix1;
- } osd1; /* OS dependent 1 */
- unsigned long i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
- unsigned long i_version; /* File version (for NFS) */
- unsigned long i_file_acl; /* File ACL */
- unsigned long i_dir_acl; /* Directory ACL */
- unsigned long i_faddr; /* Fragment address */
- union {
- struct {
- unsigned char l_i_frag; /* Fragment number */
- unsigned char l_i_fsize; /* Fragment size */
- unsigned short i_pad1;
- unsigned long l_i_reserved2[2];
- } linux2;
- struct {
- unsigned char h_i_frag; /* Fragment number */
- unsigned char h_i_fsize; /* Fragment size */
- unsigned short h_i_mode_high;
- unsigned short h_i_uid_high;
- unsigned short h_i_gid_high;
- unsigned long h_i_author;
- } hurd2;
- struct {
- unsigned char m_i_frag; /* Fragment number */
- unsigned char m_i_fsize; /* Fragment size */
- unsigned short m_pad1;
- unsigned long m_i_reserved2[2];
- } masix2;
- } osd2; /* OS dependent 2 */
- };
-
- #ifdef __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 {
- unsigned long s_inodes_count; /* Inodes count */
- unsigned long s_blocks_count; /* Blocks count */
- unsigned long s_r_blocks_count;/* Reserved blocks count */
- unsigned long s_free_blocks_count;/* Free blocks count */
- unsigned long s_free_inodes_count;/* Free inodes count */
- unsigned long s_first_data_block;/* First Data Block */
- unsigned long s_log_block_size;/* Block size */
- long s_log_frag_size; /* Fragment size */
- unsigned long s_blocks_per_group;/* # Blocks per group */
- unsigned long s_frags_per_group;/* # Fragments per group */
- unsigned long s_inodes_per_group;/* # Inodes per group */
- unsigned long s_mtime; /* Mount time */
- unsigned long s_wtime; /* Write time */
- unsigned short s_mnt_count; /* Mount count */
- short s_max_mnt_count; /* Maximal mount count */
- unsigned short s_magic; /* Magic signature */
- unsigned short s_state; /* File system state */
- unsigned short s_errors; /* Behaviour when detecting errors */
- unsigned short s_pad;
- unsigned long s_lastcheck; /* time of last check */
- unsigned long s_checkinterval; /* max. time between checks */
- unsigned long s_creator_os; /* OS */
- unsigned long s_rev_level; /* Revision level */
- unsigned short s_def_resuid; /* Default uid for reserved blocks */
- unsigned short s_def_resgid; /* Default gid for reserved blocks */
- unsigned long s_reserved[235]; /* Padding to the end of the block */
- };
-
- #define EXT2_OS_LINUX 0
- #define EXT2_OS_HURD 1
- #define EXT2_OS_MASIX 2
-
- #define EXT2_CURRENT_REV 0
-
- #define EXT2_DEF_RESUID 0
- #define EXT2_DEF_RESGID 0
-
- /*
- * Structure of a directory entry
- */
- #define EXT2_NAME_LEN 255
-
- struct ext2_dir_entry {
- unsigned long inode; /* Inode number */
- unsigned short rec_len; /* Directory entry length */
- unsigned short 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 (struct super_block *, unsigned long,
- unsigned long *, unsigned long *);
- extern void ext2_free_blocks (struct super_block *, 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 (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);
- 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);
-
- /* 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 void ext2_statfs (struct super_block *, struct statfs *);
-
- /* 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 */
-