1/* 2 * linux/include/linux/ext3_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16#ifndef _LINUX_EXT3_FS_H 17#define _LINUX_EXT3_FS_H 18 19#include <linux/types.h> 20#include <linux/magic.h> 21 22/* 23 * The second extended filesystem constants/structures 24 */ 25 26/* 27 * Define EXT3FS_DEBUG to produce debug messages 28 */ 29#undef EXT3FS_DEBUG 30 31/* 32 * Define EXT3_RESERVATION to reserve data blocks for expanding files 33 */ 34#define EXT3_DEFAULT_RESERVE_BLOCKS 8 35/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 36#define EXT3_MAX_RESERVE_BLOCKS 1027 37#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0 38/* 39 * Always enable hashed directories 40 */ 41#define CONFIG_EXT3_INDEX 42 43/* 44 * Debug code 45 */ 46#ifdef EXT3FS_DEBUG 47#define ext3_debug(f, a...) \ 48 do { \ 49 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \ 50 __FILE__, __LINE__, __FUNCTION__); \ 51 printk (KERN_DEBUG f, ## a); \ 52 } while (0) 53#else 54#define ext3_debug(f, a...) do {} while (0) 55#endif 56 57/* 58 * Special inodes numbers 59 */ 60#define EXT3_BAD_INO 1 /* Bad blocks inode */ 61#define EXT3_ROOT_INO 2 /* Root inode */ 62#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */ 63#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */ 64#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */ 65#define EXT3_JOURNAL_INO 8 /* Journal inode */ 66 67/* First non-reserved inode for old ext3 filesystems */ 68#define EXT3_GOOD_OLD_FIRST_INO 11 69 70/* 71 * Maximal count of links to a file 72 */ 73#define EXT3_LINK_MAX 32000 74 75/* 76 * Macro-instructions used to manage several block sizes 77 */ 78#define EXT3_MIN_BLOCK_SIZE 1024 79#define EXT3_MAX_BLOCK_SIZE 4096 80#define EXT3_MIN_BLOCK_LOG_SIZE 10 81#ifdef __KERNEL__ 82# define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize) 83#else 84# define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size) 85#endif 86#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32)) 87#ifdef __KERNEL__ 88# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 89#else 90# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 91#endif 92#ifdef __KERNEL__ 93#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits) 94#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size) 95#define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino) 96#else 97#define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \ 98 EXT3_GOOD_OLD_INODE_SIZE : \ 99 (s)->s_inode_size) 100#define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \ 101 EXT3_GOOD_OLD_FIRST_INO : \ 102 (s)->s_first_ino) 103#endif 104 105/* 106 * Macro-instructions used to manage fragments 107 */ 108#define EXT3_MIN_FRAG_SIZE 1024 109#define EXT3_MAX_FRAG_SIZE 4096 110#define EXT3_MIN_FRAG_LOG_SIZE 10 111#ifdef __KERNEL__ 112# define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size) 113# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block) 114#else 115# define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size) 116# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s)) 117#endif 118 119/* 120 * Structure of a blocks group descriptor 121 */ 122struct ext3_group_desc 123{ 124 __le32 bg_block_bitmap; /* Blocks bitmap block */ 125 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 126 __le32 bg_inode_table; /* Inodes table block */ 127 __le16 bg_free_blocks_count; /* Free blocks count */ 128 __le16 bg_free_inodes_count; /* Free inodes count */ 129 __le16 bg_used_dirs_count; /* Directories count */ 130 __u16 bg_pad; 131 __le32 bg_reserved[3]; 132}; 133 134/* 135 * Macro-instructions used to manage group descriptors 136 */ 137#ifdef __KERNEL__ 138# define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group) 139# define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block) 140# define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group) 141# define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits) 142#else 143# define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 144# define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc)) 145# define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 146#endif 147 148/* 149 * Constants relative to the data blocks 150 */ 151#define EXT3_NDIR_BLOCKS 12 152#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS 153#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1) 154#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1) 155#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1) 156 157/* 158 * Inode flags 159 */ 160#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */ 161#define EXT3_UNRM_FL 0x00000002 /* Undelete */ 162#define EXT3_COMPR_FL 0x00000004 /* Compress file */ 163#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */ 164#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */ 165#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */ 166#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */ 167#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */ 168/* Reserved for compression usage... */ 169#define EXT3_DIRTY_FL 0x00000100 170#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 171#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */ 172#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */ 173/* End compression flags --- maybe not all used */ 174#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */ 175#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */ 176#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 177#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 178#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 179#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 180#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */ 181 182#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 183#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 184 185/* 186 * Inode dynamic state flags 187 */ 188#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */ 189#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */ 190#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 191 192/* Used to pass group descriptor data when online resize is done */ 193struct ext3_new_group_input { 194 __u32 group; /* Group number for this data */ 195 __u32 block_bitmap; /* Absolute block number of block bitmap */ 196 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 197 __u32 inode_table; /* Absolute block number of inode table start */ 198 __u32 blocks_count; /* Total number of blocks in this group */ 199 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 200 __u16 unused; 201}; 202 203/* The struct ext3_new_group_input in kernel space, with free_blocks_count */ 204struct ext3_new_group_data { 205 __u32 group; 206 __u32 block_bitmap; 207 __u32 inode_bitmap; 208 __u32 inode_table; 209 __u32 blocks_count; 210 __u16 reserved_blocks; 211 __u16 unused; 212 __u32 free_blocks_count; 213}; 214 215 216/* 217 * ioctl commands 218 */ 219#define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS 220#define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS 221#define EXT3_IOC_GETVERSION _IOR('f', 3, long) 222#define EXT3_IOC_SETVERSION _IOW('f', 4, long) 223#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 224#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input) 225#define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION 226#define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION 227#ifdef CONFIG_JBD_DEBUG 228#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 229#endif 230#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long) 231#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long) 232 233/* 234 * ioctl commands in 32 bit emulation 235 */ 236#define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS 237#define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS 238#define EXT3_IOC32_GETVERSION _IOR('f', 3, int) 239#define EXT3_IOC32_SETVERSION _IOW('f', 4, int) 240#define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int) 241#define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int) 242#define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 243#ifdef CONFIG_JBD_DEBUG 244#define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 245#endif 246#define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 247#define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 248 249 250/* 251 * Mount options 252 */ 253struct ext3_mount_options { 254 unsigned long s_mount_opt; 255 uid_t s_resuid; 256 gid_t s_resgid; 257 unsigned long s_commit_interval; 258#ifdef CONFIG_QUOTA 259 int s_jquota_fmt; 260 char *s_qf_names[MAXQUOTAS]; 261#endif 262}; 263 264/* 265 * Structure of an inode on the disk 266 */ 267struct ext3_inode { 268 __le16 i_mode; /* File mode */ 269 __le16 i_uid; /* Low 16 bits of Owner Uid */ 270 __le32 i_size; /* Size in bytes */ 271 __le32 i_atime; /* Access time */ 272 __le32 i_ctime; /* Creation time */ 273 __le32 i_mtime; /* Modification time */ 274 __le32 i_dtime; /* Deletion Time */ 275 __le16 i_gid; /* Low 16 bits of Group Id */ 276 __le16 i_links_count; /* Links count */ 277 __le32 i_blocks; /* Blocks count */ 278 __le32 i_flags; /* File flags */ 279 union { 280 struct { 281 __u32 l_i_reserved1; 282 } linux1; 283 struct { 284 __u32 h_i_translator; 285 } hurd1; 286 struct { 287 __u32 m_i_reserved1; 288 } masix1; 289 } osd1; /* OS dependent 1 */ 290 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */ 291 __le32 i_generation; /* File version (for NFS) */ 292 __le32 i_file_acl; /* File ACL */ 293 __le32 i_dir_acl; /* Directory ACL */ 294 __le32 i_faddr; /* Fragment address */ 295 union { 296 struct { 297 __u8 l_i_frag; /* Fragment number */ 298 __u8 l_i_fsize; /* Fragment size */ 299 __u16 i_pad1; 300 __le16 l_i_uid_high; /* these 2 fields */ 301 __le16 l_i_gid_high; /* were reserved2[0] */ 302 __u32 l_i_reserved2; 303 } linux2; 304 struct { 305 __u8 h_i_frag; /* Fragment number */ 306 __u8 h_i_fsize; /* Fragment size */ 307 __u16 h_i_mode_high; 308 __u16 h_i_uid_high; 309 __u16 h_i_gid_high; 310 __u32 h_i_author; 311 } hurd2; 312 struct { 313 __u8 m_i_frag; /* Fragment number */ 314 __u8 m_i_fsize; /* Fragment size */ 315 __u16 m_pad1; 316 __u32 m_i_reserved2[2]; 317 } masix2; 318 } osd2; /* OS dependent 2 */ 319 __le16 i_extra_isize; 320 __le16 i_pad1; 321}; 322 323#define i_size_high i_dir_acl 324 325#if defined(__KERNEL__) || defined(__linux__) 326#define i_reserved1 osd1.linux1.l_i_reserved1 327#define i_frag osd2.linux2.l_i_frag 328#define i_fsize osd2.linux2.l_i_fsize 329#define i_uid_low i_uid 330#define i_gid_low i_gid 331#define i_uid_high osd2.linux2.l_i_uid_high 332#define i_gid_high osd2.linux2.l_i_gid_high 333#define i_reserved2 osd2.linux2.l_i_reserved2 334 335#elif defined(__GNU__) 336 337#define i_translator osd1.hurd1.h_i_translator 338#define i_frag osd2.hurd2.h_i_frag; 339#define i_fsize osd2.hurd2.h_i_fsize; 340#define i_uid_high osd2.hurd2.h_i_uid_high 341#define i_gid_high osd2.hurd2.h_i_gid_high 342#define i_author osd2.hurd2.h_i_author 343 344#elif defined(__masix__) 345 346#define i_reserved1 osd1.masix1.m_i_reserved1 347#define i_frag osd2.masix2.m_i_frag 348#define i_fsize osd2.masix2.m_i_fsize 349#define i_reserved2 osd2.masix2.m_i_reserved2 350 351#endif /* defined(__KERNEL__) || defined(__linux__) */ 352 353/* 354 * File system states 355 */ 356#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */ 357#define EXT3_ERROR_FS 0x0002 /* Errors detected */ 358#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 359 360/* 361 * Mount flags 362 */ 363#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */ 364#define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 365#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 366#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 367#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 368#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 369#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 370#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 371#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 372#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */ 373#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 374#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 375#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 376#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 377#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 378#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 379#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 380#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 381#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */ 382#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */ 383#define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */ 384#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */ 385#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 386#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 387 388/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */ 389#ifndef _LINUX_EXT2_FS_H 390#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt 391#define set_opt(o, opt) o |= EXT3_MOUNT_##opt 392#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \ 393 EXT3_MOUNT_##opt) 394#else 395#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD 396#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT 397#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS 398#endif 399 400#define ext3_set_bit ext2_set_bit 401#define ext3_set_bit_atomic ext2_set_bit_atomic 402#define ext3_clear_bit ext2_clear_bit 403#define ext3_clear_bit_atomic ext2_clear_bit_atomic 404#define ext3_test_bit ext2_test_bit 405#define ext3_find_first_zero_bit ext2_find_first_zero_bit 406#define ext3_find_next_zero_bit ext2_find_next_zero_bit 407 408/* 409 * Maximal mount counts between two filesystem checks 410 */ 411#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 412#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 413 414/* 415 * Behaviour when detecting errors 416 */ 417#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */ 418#define EXT3_ERRORS_RO 2 /* Remount fs read-only */ 419#define EXT3_ERRORS_PANIC 3 /* Panic */ 420#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE 421 422/* 423 * Structure of the super block 424 */ 425struct ext3_super_block { 426/*00*/ __le32 s_inodes_count; /* Inodes count */ 427 __le32 s_blocks_count; /* Blocks count */ 428 __le32 s_r_blocks_count; /* Reserved blocks count */ 429 __le32 s_free_blocks_count; /* Free blocks count */ 430/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 431 __le32 s_first_data_block; /* First Data Block */ 432 __le32 s_log_block_size; /* Block size */ 433 __le32 s_log_frag_size; /* Fragment size */ 434/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 435 __le32 s_frags_per_group; /* # Fragments per group */ 436 __le32 s_inodes_per_group; /* # Inodes per group */ 437 __le32 s_mtime; /* Mount time */ 438/*30*/ __le32 s_wtime; /* Write time */ 439 __le16 s_mnt_count; /* Mount count */ 440 __le16 s_max_mnt_count; /* Maximal mount count */ 441 __le16 s_magic; /* Magic signature */ 442 __le16 s_state; /* File system state */ 443 __le16 s_errors; /* Behaviour when detecting errors */ 444 __le16 s_minor_rev_level; /* minor revision level */ 445/*40*/ __le32 s_lastcheck; /* time of last check */ 446 __le32 s_checkinterval; /* max. time between checks */ 447 __le32 s_creator_os; /* OS */ 448 __le32 s_rev_level; /* Revision level */ 449/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 450 __le16 s_def_resgid; /* Default gid for reserved blocks */ 451 /* 452 * These fields are for EXT3_DYNAMIC_REV superblocks only. 453 * 454 * Note: the difference between the compatible feature set and 455 * the incompatible feature set is that if there is a bit set 456 * in the incompatible feature set that the kernel doesn't 457 * know about, it should refuse to mount the filesystem. 458 * 459 * e2fsck's requirements are more strict; if it doesn't know 460 * about a feature in either the compatible or incompatible 461 * feature set, it must abort and not try to meddle with 462 * things it doesn't understand... 463 */ 464 __le32 s_first_ino; /* First non-reserved inode */ 465 __le16 s_inode_size; /* size of inode structure */ 466 __le16 s_block_group_nr; /* block group # of this superblock */ 467 __le32 s_feature_compat; /* compatible feature set */ 468/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 469 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 470/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 471/*78*/ char s_volume_name[16]; /* volume name */ 472/*88*/ char s_last_mounted[64]; /* directory where last mounted */ 473/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 474 /* 475 * Performance hints. Directory preallocation should only 476 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on. 477 */ 478 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 479 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 480 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 481 /* 482 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 483 */ 484/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 485/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 486 __le32 s_journal_dev; /* device number of journal file */ 487 __le32 s_last_orphan; /* start of list of inodes to delete */ 488 __le32 s_hash_seed[4]; /* HTREE hash seed */ 489 __u8 s_def_hash_version; /* Default hash version to use */ 490 __u8 s_reserved_char_pad; 491 __u16 s_reserved_word_pad; 492 __le32 s_default_mount_opts; 493 __le32 s_first_meta_bg; /* First metablock block group */ 494 __u32 s_reserved[190]; /* Padding to the end of the block */ 495}; 496 497#ifdef __KERNEL__ 498#include <linux/ext3_fs_i.h> 499#include <linux/ext3_fs_sb.h> 500static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb) 501{ 502 return sb->s_fs_info; 503} 504static inline struct ext3_inode_info *EXT3_I(struct inode *inode) 505{ 506 return container_of(inode, struct ext3_inode_info, vfs_inode); 507} 508 509static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino) 510{ 511 return ino == EXT3_ROOT_INO || 512 ino == EXT3_JOURNAL_INO || 513 ino == EXT3_RESIZE_INO || 514 (ino >= EXT3_FIRST_INO(sb) && 515 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)); 516} 517#else 518/* Assume that user mode programs are passing in an ext3fs superblock, not 519 * a kernel struct super_block. This will allow us to call the feature-test 520 * macros from user land. */ 521#define EXT3_SB(sb) (sb) 522#endif 523 524#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime 525 526/* 527 * Codes for operating systems 528 */ 529#define EXT3_OS_LINUX 0 530#define EXT3_OS_HURD 1 531#define EXT3_OS_MASIX 2 532#define EXT3_OS_FREEBSD 3 533#define EXT3_OS_LITES 4 534 535/* 536 * Revision levels 537 */ 538#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */ 539#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 540 541#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV 542#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV 543 544#define EXT3_GOOD_OLD_INODE_SIZE 128 545 546/* 547 * Feature set definitions 548 */ 549 550#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \ 551 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 552#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \ 553 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 554#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \ 555 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 556#define EXT3_SET_COMPAT_FEATURE(sb,mask) \ 557 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 558#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \ 559 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 560#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \ 561 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 562#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \ 563 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 564#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 565 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 566#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 567 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 568 569#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001 570#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002 571#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 572#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008 573#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010 574#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020 575 576#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 577#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 578#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 579 580#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001 581#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002 582#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 583#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 584#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010 585 586#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 587#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \ 588 EXT3_FEATURE_INCOMPAT_RECOVER| \ 589 EXT3_FEATURE_INCOMPAT_META_BG) 590#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 591 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \ 592 EXT3_FEATURE_RO_COMPAT_BTREE_DIR) 593 594/* 595 * Default values for user and/or group using reserved blocks 596 */ 597#define EXT3_DEF_RESUID 0 598#define EXT3_DEF_RESGID 0 599 600/* 601 * Default mount options 602 */ 603#define EXT3_DEFM_DEBUG 0x0001 604#define EXT3_DEFM_BSDGROUPS 0x0002 605#define EXT3_DEFM_XATTR_USER 0x0004 606#define EXT3_DEFM_ACL 0x0008 607#define EXT3_DEFM_UID16 0x0010 608#define EXT3_DEFM_JMODE 0x0060 609#define EXT3_DEFM_JMODE_DATA 0x0020 610#define EXT3_DEFM_JMODE_ORDERED 0x0040 611#define EXT3_DEFM_JMODE_WBACK 0x0060 612 613/* 614 * Structure of a directory entry 615 */ 616#define EXT3_NAME_LEN 255 617 618struct ext3_dir_entry { 619 __le32 inode; /* Inode number */ 620 __le16 rec_len; /* Directory entry length */ 621 __le16 name_len; /* Name length */ 622 char name[EXT3_NAME_LEN]; /* File name */ 623}; 624 625/* 626 * The new version of the directory entry. Since EXT3 structures are 627 * stored in intel byte order, and the name_len field could never be 628 * bigger than 255 chars, it's safe to reclaim the extra byte for the 629 * file_type field. 630 */ 631struct ext3_dir_entry_2 { 632 __le32 inode; /* Inode number */ 633 __le16 rec_len; /* Directory entry length */ 634 __u8 name_len; /* Name length */ 635 __u8 file_type; 636 char name[EXT3_NAME_LEN]; /* File name */ 637}; 638 639/* 640 * Ext3 directory file types. Only the low 3 bits are used. The 641 * other bits are reserved for now. 642 */ 643#define EXT3_FT_UNKNOWN 0 644#define EXT3_FT_REG_FILE 1 645#define EXT3_FT_DIR 2 646#define EXT3_FT_CHRDEV 3 647#define EXT3_FT_BLKDEV 4 648#define EXT3_FT_FIFO 5 649#define EXT3_FT_SOCK 6 650#define EXT3_FT_SYMLINK 7 651 652#define EXT3_FT_MAX 8 653 654/* 655 * EXT3_DIR_PAD defines the directory entries boundaries 656 * 657 * NOTE: It must be a multiple of 4 658 */ 659#define EXT3_DIR_PAD 4 660#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1) 661#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \ 662 ~EXT3_DIR_ROUND) 663/* 664 * Hash Tree Directory indexing 665 * (c) Daniel Phillips, 2001 666 */ 667 668#ifdef CONFIG_EXT3_INDEX 669 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \ 670 EXT3_FEATURE_COMPAT_DIR_INDEX) && \ 671 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) 672#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX) 673#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 674#else 675 #define is_dx(dir) 0 676#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX) 677#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2) 678#endif 679 680/* Legal values for the dx_root hash_version field: */ 681 682#define DX_HASH_LEGACY 0 683#define DX_HASH_HALF_MD4 1 684#define DX_HASH_TEA 2 685 686#ifdef __KERNEL__ 687 688/* hash info structure used by the directory hash */ 689struct dx_hash_info 690{ 691 u32 hash; 692 u32 minor_hash; 693 int hash_version; 694 u32 *seed; 695}; 696 697#define EXT3_HTREE_EOF 0x7fffffff 698 699/* 700 * Control parameters used by ext3_htree_next_block 701 */ 702#define HASH_NB_ALWAYS 1 703 704 705/* 706 * Describe an inode's exact location on disk and in memory 707 */ 708struct ext3_iloc 709{ 710 struct buffer_head *bh; 711 unsigned long offset; 712 unsigned long block_group; 713}; 714 715static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc) 716{ 717 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset); 718} 719 720/* 721 * This structure is stuffed into the struct file's private_data field 722 * for directories. It is where we put information so that we can do 723 * readdir operations in hash tree order. 724 */ 725struct dir_private_info { 726 struct rb_root root; 727 struct rb_node *curr_node; 728 struct fname *extra_fname; 729 loff_t last_pos; 730 __u32 curr_hash; 731 __u32 curr_minor_hash; 732 __u32 next_hash; 733}; 734 735/* calculate the first block number of the group */ 736static inline ext3_fsblk_t 737ext3_group_first_block_no(struct super_block *sb, unsigned long group_no) 738{ 739 return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) + 740 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block); 741} 742 743/* 744 * Special error return code only used by dx_probe() and its callers. 745 */ 746#define ERR_BAD_DX_DIR -75000 747 748/* 749 * Function prototypes 750 */ 751 752/* 753 * Ok, these declarations are also in <linux/kernel.h> but none of the 754 * ext3 source programs needs to include it so they are duplicated here. 755 */ 756# define NORET_TYPE /**/ 757# define ATTRIB_NORET __attribute__((noreturn)) 758# define NORET_AND noreturn, 759 760/* balloc.c */ 761extern int ext3_bg_has_super(struct super_block *sb, int group); 762extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group); 763extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode, 764 ext3_fsblk_t goal, int *errp); 765extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode, 766 ext3_fsblk_t goal, unsigned long *count, int *errp); 767extern void ext3_free_blocks (handle_t *handle, struct inode *inode, 768 ext3_fsblk_t block, unsigned long count); 769extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb, 770 ext3_fsblk_t block, unsigned long count, 771 unsigned long *pdquot_freed_blocks); 772extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *); 773extern void ext3_check_blocks_bitmap (struct super_block *); 774extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb, 775 unsigned int block_group, 776 struct buffer_head ** bh); 777extern int ext3_should_retry_alloc(struct super_block *sb, int *retries); 778extern void ext3_init_block_alloc_info(struct inode *); 779extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv); 780 781/* dir.c */ 782extern int ext3_check_dir_entry(const char *, struct inode *, 783 struct ext3_dir_entry_2 *, 784 struct buffer_head *, unsigned long); 785extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, 786 __u32 minor_hash, 787 struct ext3_dir_entry_2 *dirent); 788extern void ext3_htree_free_dir_info(struct dir_private_info *p); 789 790/* fsync.c */ 791extern int ext3_sync_file (struct file *, struct dentry *, int); 792 793/* hash.c */ 794extern int ext3fs_dirhash(const char *name, int len, struct 795 dx_hash_info *hinfo); 796 797/* ialloc.c */ 798extern struct inode * ext3_new_inode (handle_t *, struct inode *, int); 799extern void ext3_free_inode (handle_t *, struct inode *); 800extern struct inode * ext3_orphan_get (struct super_block *, unsigned long); 801extern unsigned long ext3_count_free_inodes (struct super_block *); 802extern unsigned long ext3_count_dirs (struct super_block *); 803extern void ext3_check_inodes_bitmap (struct super_block *); 804extern unsigned long ext3_count_free (struct buffer_head *, unsigned); 805 806 807/* inode.c */ 808int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, 809 struct buffer_head *bh, ext3_fsblk_t blocknr); 810struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *); 811struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *); 812int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, 813 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, 814 int create, int extend_disksize); 815 816extern void ext3_read_inode (struct inode *); 817extern int ext3_write_inode (struct inode *, int); 818extern int ext3_setattr (struct dentry *, struct iattr *); 819extern void ext3_delete_inode (struct inode *); 820extern int ext3_sync_inode (handle_t *, struct inode *); 821extern void ext3_discard_reservation (struct inode *); 822extern void ext3_dirty_inode(struct inode *); 823extern int ext3_change_inode_journal_flag(struct inode *, int); 824extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *); 825extern void ext3_truncate (struct inode *); 826extern void ext3_set_inode_flags(struct inode *); 827extern void ext3_get_inode_flags(struct ext3_inode_info *); 828extern void ext3_set_aops(struct inode *inode); 829 830/* ioctl.c */ 831extern int ext3_ioctl (struct inode *, struct file *, unsigned int, 832 unsigned long); 833extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long); 834 835/* namei.c */ 836extern int ext3_orphan_add(handle_t *, struct inode *); 837extern int ext3_orphan_del(handle_t *, struct inode *); 838extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash, 839 __u32 start_minor_hash, __u32 *next_hash); 840 841/* resize.c */ 842extern int ext3_group_add(struct super_block *sb, 843 struct ext3_new_group_data *input); 844extern int ext3_group_extend(struct super_block *sb, 845 struct ext3_super_block *es, 846 ext3_fsblk_t n_blocks_count); 847 848/* super.c */ 849extern void ext3_error (struct super_block *, const char *, const char *, ...) 850 __attribute__ ((format (printf, 3, 4))); 851extern void __ext3_std_error (struct super_block *, const char *, int); 852extern void ext3_abort (struct super_block *, const char *, const char *, ...) 853 __attribute__ ((format (printf, 3, 4))); 854extern void ext3_warning (struct super_block *, const char *, const char *, ...) 855 __attribute__ ((format (printf, 3, 4))); 856extern void ext3_update_dynamic_rev (struct super_block *sb); 857 858#define ext3_std_error(sb, errno) \ 859do { \ 860 if ((errno)) \ 861 __ext3_std_error((sb), __FUNCTION__, (errno)); \ 862} while (0) 863 864/* 865 * Inodes and files operations 866 */ 867 868/* dir.c */ 869extern const struct file_operations ext3_dir_operations; 870 871/* file.c */ 872extern const struct inode_operations ext3_file_inode_operations; 873extern const struct file_operations ext3_file_operations; 874 875/* namei.c */ 876extern const struct inode_operations ext3_dir_inode_operations; 877extern const struct inode_operations ext3_special_inode_operations; 878 879/* symlink.c */ 880extern const struct inode_operations ext3_symlink_inode_operations; 881extern const struct inode_operations ext3_fast_symlink_inode_operations; 882 883 884#endif /* __KERNEL__ */ 885 886#endif /* _LINUX_EXT3_FS_H */ 887