/* * 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 DONT_USE_DCACHE to inhibit the directory cache */ #define DONT_USE_DCACHE /* * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files */ #define EXT2_PREALLOCATE /* * The second extended file system version */ #define EXT2FS_DATE "94/03/10" #define EXT2FS_VERSION "0.5" /* * Debug code */ #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 /* * 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 0x0001 /* Secure deletion */ #define EXT2_UNRM_FL 0x0002 /* Undelete */ #define EXT2_COMPR_FL 0x0004 /* Compress file */ #define EXT2_SYNC_FL 0x0008 /* Synchronous updates */ /* * 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 */ unsigned long i_reserved1; 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 */ unsigned char i_frag; /* Fragment number */ unsigned char i_fsize; /* Fragment size */ unsigned short i_pad1; unsigned long i_reserved2[2]; }; /* * File system states */ #define EXT2_VALID_FS 0x0001 /* Unmounted cleany */ #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 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_reserved[238]; /* Padding to the end of the block */ }; /* * 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 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); #ifndef DONT_USE_DCACHE /* dcache.c */ extern void ext2_dcache_invalidate (unsigned short); extern unsigned long ext2_dcache_lookup (unsigned short, unsigned long, const char *, int); extern void ext2_dcache_add (unsigned short, unsigned long, const char *, int, unsigned long); extern void ext2_dcache_remove (unsigned short, unsigned long, const char *, int); #endif /* 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 int ext2_open (struct inode *, struct file *); 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 */