1/* 2 * Copyright (C) 1992, 1993, 1994, 1995 3 * Remy Card (card@masi.ibp.fr) 4 * Laboratoire MASI - Institut Blaise Pascal 5 * Universite Pierre et Marie Curie (Paris VI) 6 * 7 * from 8 * 9 * linux/include/linux/minix_fs.h 10 * 11 * Copyright (C) 1991, 1992 Linus Torvalds 12 */ 13#include <linux/fs.h> 14#include <linux/ext2_fs.h> 15#include <linux/blockgroup_lock.h> 16#include <linux/percpu_counter.h> 17#include <linux/rbtree.h> 18 19/* XXX Here for now... not interested in restructing headers JUST now */ 20 21/* data type for block offset of block group */ 22typedef int ext2_grpblk_t; 23 24/* data type for filesystem-wide blocks number */ 25typedef unsigned long ext2_fsblk_t; 26 27#define E2FSBLK "%lu" 28 29struct ext2_reserve_window { 30 ext2_fsblk_t _rsv_start; /* First byte reserved */ 31 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 32}; 33 34struct ext2_reserve_window_node { 35 struct rb_node rsv_node; 36 __u32 rsv_goal_size; 37 __u32 rsv_alloc_hit; 38 struct ext2_reserve_window rsv_window; 39}; 40 41struct ext2_block_alloc_info { 42 /* information about reservation window */ 43 struct ext2_reserve_window_node rsv_window_node; 44 /* 45 * was i_next_alloc_block in ext2_inode_info 46 * is the logical (file-relative) number of the 47 * most-recently-allocated block in this file. 48 * We use this for detecting linearly ascending allocation requests. 49 */ 50 __u32 last_alloc_logical_block; 51 /* 52 * Was i_next_alloc_goal in ext2_inode_info 53 * is the *physical* companion to i_next_alloc_block. 54 * it the the physical block number of the block which was most-recentl 55 * allocated to this file. This give us the goal (target) for the next 56 * allocation when we detect linearly ascending requests. 57 */ 58 ext2_fsblk_t last_alloc_physical_block; 59}; 60 61#define rsv_start rsv_window._rsv_start 62#define rsv_end rsv_window._rsv_end 63 64/* 65 * second extended-fs super-block data in memory 66 */ 67struct ext2_sb_info { 68 unsigned long s_frag_size; /* Size of a fragment in bytes */ 69 unsigned long s_frags_per_block;/* Number of fragments per block */ 70 unsigned long s_inodes_per_block;/* Number of inodes per block */ 71 unsigned long s_frags_per_group;/* Number of fragments in a group */ 72 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 73 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 74 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 75 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 76 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 77 unsigned long s_groups_count; /* Number of groups in the fs */ 78 unsigned long s_overhead_last; /* Last calculated overhead */ 79 unsigned long s_blocks_last; /* Last seen block count */ 80 struct buffer_head * s_sbh; /* Buffer containing the super block */ 81 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 82 struct buffer_head ** s_group_desc; 83 unsigned long s_mount_opt; 84 unsigned long s_sb_block; 85 kuid_t s_resuid; 86 kgid_t s_resgid; 87 unsigned short s_mount_state; 88 unsigned short s_pad; 89 int s_addr_per_block_bits; 90 int s_desc_per_block_bits; 91 int s_inode_size; 92 int s_first_ino; 93 spinlock_t s_next_gen_lock; 94 u32 s_next_generation; 95 unsigned long s_dir_count; 96 u8 *s_debts; 97 struct percpu_counter s_freeblocks_counter; 98 struct percpu_counter s_freeinodes_counter; 99 struct percpu_counter s_dirs_counter; 100 struct blockgroup_lock *s_blockgroup_lock; 101 /* root of the per fs reservation window tree */ 102 spinlock_t s_rsv_window_lock; 103 struct rb_root s_rsv_window_root; 104 struct ext2_reserve_window_node s_rsv_window_head; 105 /* 106 * s_lock protects against concurrent modifications of s_mount_state, 107 * s_blocks_last, s_overhead_last and the content of superblock's 108 * buffer pointed to by sbi->s_es. 109 * 110 * Note: It is used in ext2_show_options() to provide a consistent view 111 * of the mount options. 112 */ 113 spinlock_t s_lock; 114}; 115 116static inline spinlock_t * 117sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 118{ 119 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 120} 121 122/* 123 * Define EXT2FS_DEBUG to produce debug messages 124 */ 125#undef EXT2FS_DEBUG 126 127/* 128 * Define EXT2_RESERVATION to reserve data blocks for expanding files 129 */ 130#define EXT2_DEFAULT_RESERVE_BLOCKS 8 131/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 132#define EXT2_MAX_RESERVE_BLOCKS 1027 133#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 134/* 135 * The second extended file system version 136 */ 137#define EXT2FS_DATE "95/08/09" 138#define EXT2FS_VERSION "0.5b" 139 140/* 141 * Debug code 142 */ 143#ifdef EXT2FS_DEBUG 144# define ext2_debug(f, a...) { \ 145 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 146 __FILE__, __LINE__, __func__); \ 147 printk (f, ## a); \ 148 } 149#else 150# define ext2_debug(f, a...) /**/ 151#endif 152 153/* 154 * Special inode numbers 155 */ 156#define EXT2_BAD_INO 1 /* Bad blocks inode */ 157#define EXT2_ROOT_INO 2 /* Root inode */ 158#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 159#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 160 161/* First non-reserved inode for old ext2 filesystems */ 162#define EXT2_GOOD_OLD_FIRST_INO 11 163 164static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 165{ 166 return sb->s_fs_info; 167} 168 169/* 170 * Macro-instructions used to manage several block sizes 171 */ 172#define EXT2_MIN_BLOCK_SIZE 1024 173#define EXT2_MAX_BLOCK_SIZE 4096 174#define EXT2_MIN_BLOCK_LOG_SIZE 10 175#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 176#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 177#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 178#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 179#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 180#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 181 182/* 183 * Macro-instructions used to manage fragments 184 */ 185#define EXT2_MIN_FRAG_SIZE 1024 186#define EXT2_MAX_FRAG_SIZE 4096 187#define EXT2_MIN_FRAG_LOG_SIZE 10 188#define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 189#define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 190 191/* 192 * Structure of a blocks group descriptor 193 */ 194struct ext2_group_desc 195{ 196 __le32 bg_block_bitmap; /* Blocks bitmap block */ 197 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 198 __le32 bg_inode_table; /* Inodes table block */ 199 __le16 bg_free_blocks_count; /* Free blocks count */ 200 __le16 bg_free_inodes_count; /* Free inodes count */ 201 __le16 bg_used_dirs_count; /* Directories count */ 202 __le16 bg_pad; 203 __le32 bg_reserved[3]; 204}; 205 206/* 207 * Macro-instructions used to manage group descriptors 208 */ 209#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 210#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 211#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 212#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 213 214/* 215 * Constants relative to the data blocks 216 */ 217#define EXT2_NDIR_BLOCKS 12 218#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 219#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 220#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 221#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 222 223/* 224 * Inode flags (GETFLAGS/SETFLAGS) 225 */ 226#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 227#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 228#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 229#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 230#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 231#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 232#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 233#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 234/* Reserved for compression usage... */ 235#define EXT2_DIRTY_FL FS_DIRTY_FL 236#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 237#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 238#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 239/* End compression flags --- maybe not all used */ 240#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 241#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 242#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 243#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 244#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 245#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 246#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 247#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 248 249#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 250#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 251 252/* Flags that should be inherited by new inodes from their parent. */ 253#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 254 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 255 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 256 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 257 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 258 259/* Flags that are appropriate for regular files (all but dir-specific ones). */ 260#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 261 262/* Flags that are appropriate for non-directories/regular files. */ 263#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 264 265/* Mask out flags that are inappropriate for the given type of inode. */ 266static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 267{ 268 if (S_ISDIR(mode)) 269 return flags; 270 else if (S_ISREG(mode)) 271 return flags & EXT2_REG_FLMASK; 272 else 273 return flags & EXT2_OTHER_FLMASK; 274} 275 276/* 277 * ioctl commands 278 */ 279#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 280#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 281#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 282#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 283#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 284#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 285 286/* 287 * ioctl commands in 32 bit emulation 288 */ 289#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 290#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 291#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 292#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 293 294/* 295 * Structure of an inode on the disk 296 */ 297struct ext2_inode { 298 __le16 i_mode; /* File mode */ 299 __le16 i_uid; /* Low 16 bits of Owner Uid */ 300 __le32 i_size; /* Size in bytes */ 301 __le32 i_atime; /* Access time */ 302 __le32 i_ctime; /* Creation time */ 303 __le32 i_mtime; /* Modification time */ 304 __le32 i_dtime; /* Deletion Time */ 305 __le16 i_gid; /* Low 16 bits of Group Id */ 306 __le16 i_links_count; /* Links count */ 307 __le32 i_blocks; /* Blocks count */ 308 __le32 i_flags; /* File flags */ 309 union { 310 struct { 311 __le32 l_i_reserved1; 312 } linux1; 313 struct { 314 __le32 h_i_translator; 315 } hurd1; 316 struct { 317 __le32 m_i_reserved1; 318 } masix1; 319 } osd1; /* OS dependent 1 */ 320 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 321 __le32 i_generation; /* File version (for NFS) */ 322 __le32 i_file_acl; /* File ACL */ 323 __le32 i_dir_acl; /* Directory ACL */ 324 __le32 i_faddr; /* Fragment address */ 325 union { 326 struct { 327 __u8 l_i_frag; /* Fragment number */ 328 __u8 l_i_fsize; /* Fragment size */ 329 __u16 i_pad1; 330 __le16 l_i_uid_high; /* these 2 fields */ 331 __le16 l_i_gid_high; /* were reserved2[0] */ 332 __u32 l_i_reserved2; 333 } linux2; 334 struct { 335 __u8 h_i_frag; /* Fragment number */ 336 __u8 h_i_fsize; /* Fragment size */ 337 __le16 h_i_mode_high; 338 __le16 h_i_uid_high; 339 __le16 h_i_gid_high; 340 __le32 h_i_author; 341 } hurd2; 342 struct { 343 __u8 m_i_frag; /* Fragment number */ 344 __u8 m_i_fsize; /* Fragment size */ 345 __u16 m_pad1; 346 __u32 m_i_reserved2[2]; 347 } masix2; 348 } osd2; /* OS dependent 2 */ 349}; 350 351#define i_size_high i_dir_acl 352 353#define i_reserved1 osd1.linux1.l_i_reserved1 354#define i_frag osd2.linux2.l_i_frag 355#define i_fsize osd2.linux2.l_i_fsize 356#define i_uid_low i_uid 357#define i_gid_low i_gid 358#define i_uid_high osd2.linux2.l_i_uid_high 359#define i_gid_high osd2.linux2.l_i_gid_high 360#define i_reserved2 osd2.linux2.l_i_reserved2 361 362/* 363 * File system states 364 */ 365#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 366#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 367 368/* 369 * Mount flags 370 */ 371#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 372#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 373#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 374#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 375#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 376#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 377#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 378#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 379#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 380#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 381#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 382#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 383#define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 384#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 385#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 386#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 387#ifdef CONFIG_FS_DAX 388#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 389#else 390#define EXT2_MOUNT_DAX 0 391#endif 392 393 394#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 395#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 396#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 397 EXT2_MOUNT_##opt) 398/* 399 * Maximal mount counts between two filesystem checks 400 */ 401#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 402#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 403 404/* 405 * Behaviour when detecting errors 406 */ 407#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 408#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 409#define EXT2_ERRORS_PANIC 3 /* Panic */ 410#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 411 412/* 413 * Structure of the super block 414 */ 415struct ext2_super_block { 416 __le32 s_inodes_count; /* Inodes count */ 417 __le32 s_blocks_count; /* Blocks count */ 418 __le32 s_r_blocks_count; /* Reserved blocks count */ 419 __le32 s_free_blocks_count; /* Free blocks count */ 420 __le32 s_free_inodes_count; /* Free inodes count */ 421 __le32 s_first_data_block; /* First Data Block */ 422 __le32 s_log_block_size; /* Block size */ 423 __le32 s_log_frag_size; /* Fragment size */ 424 __le32 s_blocks_per_group; /* # Blocks per group */ 425 __le32 s_frags_per_group; /* # Fragments per group */ 426 __le32 s_inodes_per_group; /* # Inodes per group */ 427 __le32 s_mtime; /* Mount time */ 428 __le32 s_wtime; /* Write time */ 429 __le16 s_mnt_count; /* Mount count */ 430 __le16 s_max_mnt_count; /* Maximal mount count */ 431 __le16 s_magic; /* Magic signature */ 432 __le16 s_state; /* File system state */ 433 __le16 s_errors; /* Behaviour when detecting errors */ 434 __le16 s_minor_rev_level; /* minor revision level */ 435 __le32 s_lastcheck; /* time of last check */ 436 __le32 s_checkinterval; /* max. time between checks */ 437 __le32 s_creator_os; /* OS */ 438 __le32 s_rev_level; /* Revision level */ 439 __le16 s_def_resuid; /* Default uid for reserved blocks */ 440 __le16 s_def_resgid; /* Default gid for reserved blocks */ 441 /* 442 * These fields are for EXT2_DYNAMIC_REV superblocks only. 443 * 444 * Note: the difference between the compatible feature set and 445 * the incompatible feature set is that if there is a bit set 446 * in the incompatible feature set that the kernel doesn't 447 * know about, it should refuse to mount the filesystem. 448 * 449 * e2fsck's requirements are more strict; if it doesn't know 450 * about a feature in either the compatible or incompatible 451 * feature set, it must abort and not try to meddle with 452 * things it doesn't understand... 453 */ 454 __le32 s_first_ino; /* First non-reserved inode */ 455 __le16 s_inode_size; /* size of inode structure */ 456 __le16 s_block_group_nr; /* block group # of this superblock */ 457 __le32 s_feature_compat; /* compatible feature set */ 458 __le32 s_feature_incompat; /* incompatible feature set */ 459 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 460 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 461 char s_volume_name[16]; /* volume name */ 462 char s_last_mounted[64]; /* directory where last mounted */ 463 __le32 s_algorithm_usage_bitmap; /* For compression */ 464 /* 465 * Performance hints. Directory preallocation should only 466 * happen if the EXT2_COMPAT_PREALLOC flag is on. 467 */ 468 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 469 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 470 __u16 s_padding1; 471 /* 472 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 473 */ 474 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 475 __u32 s_journal_inum; /* inode number of journal file */ 476 __u32 s_journal_dev; /* device number of journal file */ 477 __u32 s_last_orphan; /* start of list of inodes to delete */ 478 __u32 s_hash_seed[4]; /* HTREE hash seed */ 479 __u8 s_def_hash_version; /* Default hash version to use */ 480 __u8 s_reserved_char_pad; 481 __u16 s_reserved_word_pad; 482 __le32 s_default_mount_opts; 483 __le32 s_first_meta_bg; /* First metablock block group */ 484 __u32 s_reserved[190]; /* Padding to the end of the block */ 485}; 486 487/* 488 * Codes for operating systems 489 */ 490#define EXT2_OS_LINUX 0 491#define EXT2_OS_HURD 1 492#define EXT2_OS_MASIX 2 493#define EXT2_OS_FREEBSD 3 494#define EXT2_OS_LITES 4 495 496/* 497 * Revision levels 498 */ 499#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 500#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 501 502#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 503#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 504 505#define EXT2_GOOD_OLD_INODE_SIZE 128 506 507/* 508 * Feature set definitions 509 */ 510 511#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 512 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 513#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 514 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 515#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 516 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 517#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 518 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 519#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 520 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 521#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 522 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 523#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 524 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 525#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 526 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 527#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 528 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 529 530#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 531#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 532#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 533#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 534#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 535#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 536#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 537 538#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 539#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 540#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 541#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 542 543#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 544#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 545#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 546#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 547#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 548#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 549 550#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 551#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 552 EXT2_FEATURE_INCOMPAT_META_BG) 553#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 554 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 555 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 556#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 557#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 558 559/* 560 * Default values for user and/or group using reserved blocks 561 */ 562#define EXT2_DEF_RESUID 0 563#define EXT2_DEF_RESGID 0 564 565/* 566 * Default mount options 567 */ 568#define EXT2_DEFM_DEBUG 0x0001 569#define EXT2_DEFM_BSDGROUPS 0x0002 570#define EXT2_DEFM_XATTR_USER 0x0004 571#define EXT2_DEFM_ACL 0x0008 572#define EXT2_DEFM_UID16 0x0010 573 /* Not used by ext2, but reserved for use by ext3 */ 574#define EXT3_DEFM_JMODE 0x0060 575#define EXT3_DEFM_JMODE_DATA 0x0020 576#define EXT3_DEFM_JMODE_ORDERED 0x0040 577#define EXT3_DEFM_JMODE_WBACK 0x0060 578 579/* 580 * Structure of a directory entry 581 */ 582 583struct ext2_dir_entry { 584 __le32 inode; /* Inode number */ 585 __le16 rec_len; /* Directory entry length */ 586 __le16 name_len; /* Name length */ 587 char name[]; /* File name, up to EXT2_NAME_LEN */ 588}; 589 590/* 591 * The new version of the directory entry. Since EXT2 structures are 592 * stored in intel byte order, and the name_len field could never be 593 * bigger than 255 chars, it's safe to reclaim the extra byte for the 594 * file_type field. 595 */ 596struct ext2_dir_entry_2 { 597 __le32 inode; /* Inode number */ 598 __le16 rec_len; /* Directory entry length */ 599 __u8 name_len; /* Name length */ 600 __u8 file_type; 601 char name[]; /* File name, up to EXT2_NAME_LEN */ 602}; 603 604/* 605 * Ext2 directory file types. Only the low 3 bits are used. The 606 * other bits are reserved for now. 607 */ 608enum { 609 EXT2_FT_UNKNOWN = 0, 610 EXT2_FT_REG_FILE = 1, 611 EXT2_FT_DIR = 2, 612 EXT2_FT_CHRDEV = 3, 613 EXT2_FT_BLKDEV = 4, 614 EXT2_FT_FIFO = 5, 615 EXT2_FT_SOCK = 6, 616 EXT2_FT_SYMLINK = 7, 617 EXT2_FT_MAX 618}; 619 620/* 621 * EXT2_DIR_PAD defines the directory entries boundaries 622 * 623 * NOTE: It must be a multiple of 4 624 */ 625#define EXT2_DIR_PAD 4 626#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 627#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 628 ~EXT2_DIR_ROUND) 629#define EXT2_MAX_REC_LEN ((1<<16)-1) 630 631static inline void verify_offsets(void) 632{ 633#define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 634 A(EXT2_SB_MAGIC_OFFSET, s_magic); 635 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 636 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 637#undef A 638} 639 640/* 641 * ext2 mount options 642 */ 643struct ext2_mount_options { 644 unsigned long s_mount_opt; 645 kuid_t s_resuid; 646 kgid_t s_resgid; 647}; 648 649/* 650 * second extended file system inode data in memory 651 */ 652struct ext2_inode_info { 653 __le32 i_data[15]; 654 __u32 i_flags; 655 __u32 i_faddr; 656 __u8 i_frag_no; 657 __u8 i_frag_size; 658 __u16 i_state; 659 __u32 i_file_acl; 660 __u32 i_dir_acl; 661 __u32 i_dtime; 662 663 /* 664 * i_block_group is the number of the block group which contains 665 * this file's inode. Constant across the lifetime of the inode, 666 * it is used for making block allocation decisions - we try to 667 * place a file's data blocks near its inode block, and new inodes 668 * near to their parent directory's inode. 669 */ 670 __u32 i_block_group; 671 672 /* block reservation info */ 673 struct ext2_block_alloc_info *i_block_alloc_info; 674 675 __u32 i_dir_start_lookup; 676#ifdef CONFIG_EXT2_FS_XATTR 677 /* 678 * Extended attributes can be read independently of the main file 679 * data. Taking i_mutex even when reading would cause contention 680 * between readers of EAs and writers of regular file data, so 681 * instead we synchronize on xattr_sem when reading or changing 682 * EAs. 683 */ 684 struct rw_semaphore xattr_sem; 685#endif 686 rwlock_t i_meta_lock; 687 688 /* 689 * truncate_mutex is for serialising ext2_truncate() against 690 * ext2_getblock(). It also protects the internals of the inode's 691 * reservation data structures: ext2_reserve_window and 692 * ext2_reserve_window_node. 693 */ 694 struct mutex truncate_mutex; 695 struct inode vfs_inode; 696 struct list_head i_orphan; /* unlinked but open inodes */ 697#ifdef CONFIG_QUOTA 698 struct dquot *i_dquot[MAXQUOTAS]; 699#endif 700}; 701 702/* 703 * Inode dynamic state flags 704 */ 705#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 706 707 708/* 709 * Function prototypes 710 */ 711 712/* 713 * Ok, these declarations are also in <linux/kernel.h> but none of the 714 * ext2 source programs needs to include it so they are duplicated here. 715 */ 716 717static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 718{ 719 return container_of(inode, struct ext2_inode_info, vfs_inode); 720} 721 722/* balloc.c */ 723extern int ext2_bg_has_super(struct super_block *sb, int group); 724extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 725extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 726extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 727 unsigned long *, int *); 728extern void ext2_free_blocks (struct inode *, unsigned long, 729 unsigned long); 730extern unsigned long ext2_count_free_blocks (struct super_block *); 731extern unsigned long ext2_count_dirs (struct super_block *); 732extern void ext2_check_blocks_bitmap (struct super_block *); 733extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 734 unsigned int block_group, 735 struct buffer_head ** bh); 736extern void ext2_discard_reservation (struct inode *); 737extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 738extern void ext2_init_block_alloc_info(struct inode *); 739extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 740 741/* dir.c */ 742extern int ext2_add_link (struct dentry *, struct inode *); 743extern ino_t ext2_inode_by_name(struct inode *, struct qstr *); 744extern int ext2_make_empty(struct inode *, struct inode *); 745extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **); 746extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 747extern int ext2_empty_dir (struct inode *); 748extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 749extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 750 751/* ialloc.c */ 752extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 753extern void ext2_free_inode (struct inode *); 754extern unsigned long ext2_count_free_inodes (struct super_block *); 755extern void ext2_check_inodes_bitmap (struct super_block *); 756extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 757 758/* inode.c */ 759extern struct inode *ext2_iget (struct super_block *, unsigned long); 760extern int ext2_write_inode (struct inode *, struct writeback_control *); 761extern void ext2_evict_inode(struct inode *); 762extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 763extern int ext2_setattr (struct dentry *, struct iattr *); 764extern void ext2_set_inode_flags(struct inode *inode); 765extern void ext2_get_inode_flags(struct ext2_inode_info *); 766extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 767 u64 start, u64 len); 768 769/* ioctl.c */ 770extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 771extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 772 773/* namei.c */ 774struct dentry *ext2_get_parent(struct dentry *child); 775 776/* super.c */ 777extern __printf(3, 4) 778void ext2_error(struct super_block *, const char *, const char *, ...); 779extern __printf(3, 4) 780void ext2_msg(struct super_block *, const char *, const char *, ...); 781extern void ext2_update_dynamic_rev (struct super_block *sb); 782extern void ext2_write_super (struct super_block *); 783 784/* 785 * Inodes and files operations 786 */ 787 788/* dir.c */ 789extern const struct file_operations ext2_dir_operations; 790 791/* file.c */ 792extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 793 int datasync); 794extern const struct inode_operations ext2_file_inode_operations; 795extern const struct file_operations ext2_file_operations; 796 797/* inode.c */ 798extern const struct address_space_operations ext2_aops; 799extern const struct address_space_operations ext2_nobh_aops; 800 801/* namei.c */ 802extern const struct inode_operations ext2_dir_inode_operations; 803extern const struct inode_operations ext2_special_inode_operations; 804 805/* symlink.c */ 806extern const struct inode_operations ext2_fast_symlink_inode_operations; 807extern const struct inode_operations ext2_symlink_inode_operations; 808 809static inline ext2_fsblk_t 810ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 811{ 812 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 813 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 814} 815 816#define ext2_set_bit __test_and_set_bit_le 817#define ext2_clear_bit __test_and_clear_bit_le 818#define ext2_test_bit test_bit_le 819#define ext2_find_first_zero_bit find_first_zero_bit_le 820#define ext2_find_next_zero_bit find_next_zero_bit_le 821