diff options
author | Ralf Baechle <ralf@linux-mips.org> | 1994-11-28 11:59:19 +0000 |
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committer | <ralf@linux-mips.org> | 1994-11-28 11:59:19 +0000 |
commit | 1513ff9b7899ab588401c89db0e99903dbf5f886 (patch) | |
tree | f69cc81a940a502ea23d664c3ffb2d215a479667 /include/linux/ext2_fs.h |
Import of Linus's Linux 1.1.68
Diffstat (limited to 'include/linux/ext2_fs.h')
-rw-r--r-- | include/linux/ext2_fs.h | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/include/linux/ext2_fs.h b/include/linux/ext2_fs.h new file mode 100644 index 000000000..8a01bf234 --- /dev/null +++ b/include/linux/ext2_fs.h @@ -0,0 +1,502 @@ +/* + * 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" + +/* + * 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 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 */ |