1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (C) 1992, 1993, 1994, 1995 4 * Remy Card (card@masi.ibp.fr) 5 * Laboratoire MASI - Institut Blaise Pascal 6 * Universite Pierre et Marie Curie (Paris VI) 7 * 8 * from 9 * 10 * linux/include/linux/minix_fs.h 11 * 12 * Copyright (C) 1991, 1992 Linus Torvalds 13 */ 14#include <linux/fs.h> 15#include <linux/ext2_fs.h> 16#include <linux/blockgroup_lock.h> 17#include <linux/percpu_counter.h> 18#include <linux/rbtree.h> 19 20/* XXX Here for now... not interested in restructing headers JUST now */ 21 22/* data type for block offset of block group */ 23typedef int ext2_grpblk_t; 24 25/* data type for filesystem-wide blocks number */ 26typedef unsigned long ext2_fsblk_t; 27 28#define E2FSBLK "%lu" 29 30struct ext2_reserve_window { 31 ext2_fsblk_t _rsv_start; /* First byte reserved */ 32 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 33}; 34 35struct ext2_reserve_window_node { 36 struct rb_node rsv_node; 37 __u32 rsv_goal_size; 38 __u32 rsv_alloc_hit; 39 struct ext2_reserve_window rsv_window; 40}; 41 42struct ext2_block_alloc_info { 43 /* information about reservation window */ 44 struct ext2_reserve_window_node rsv_window_node; 45 /* 46 * was i_next_alloc_block in ext2_inode_info 47 * is the logical (file-relative) number of the 48 * most-recently-allocated block in this file. 49 * We use this for detecting linearly ascending allocation requests. 50 */ 51 __u32 last_alloc_logical_block; 52 /* 53 * Was i_next_alloc_goal in ext2_inode_info 54 * is the *physical* companion to i_next_alloc_block. 55 * it is the physical block number of the block which was most-recently 56 * allocated to this file. This gives us the goal (target) for the next 57 * allocation when we detect linearly ascending requests. 58 */ 59 ext2_fsblk_t last_alloc_physical_block; 60}; 61 62#define rsv_start rsv_window._rsv_start 63#define rsv_end rsv_window._rsv_end 64 65struct mb_cache; 66 67/* 68 * second extended-fs super-block data in memory 69 */ 70struct ext2_sb_info { 71 unsigned long s_inodes_per_block;/* Number of inodes per block */ 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 struct mb_cache *s_ea_block_cache; 115 struct dax_device *s_daxdev; 116}; 117 118static inline spinlock_t * 119sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 120{ 121 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 122} 123 124/* 125 * Define EXT2FS_DEBUG to produce debug messages 126 */ 127#undef EXT2FS_DEBUG 128 129/* 130 * Define EXT2_RESERVATION to reserve data blocks for expanding files 131 */ 132#define EXT2_DEFAULT_RESERVE_BLOCKS 8 133/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 134#define EXT2_MAX_RESERVE_BLOCKS 1027 135#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 136/* 137 * The second extended file system version 138 */ 139#define EXT2FS_DATE "95/08/09" 140#define EXT2FS_VERSION "0.5b" 141 142/* 143 * Debug code 144 */ 145#ifdef EXT2FS_DEBUG 146# define ext2_debug(f, a...) { \ 147 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 148 __FILE__, __LINE__, __func__); \ 149 printk (f, ## a); \ 150 } 151#else 152# define ext2_debug(f, a...) /**/ 153#endif 154 155/* 156 * Special inode numbers 157 */ 158#define EXT2_BAD_INO 1 /* Bad blocks inode */ 159#define EXT2_ROOT_INO 2 /* Root inode */ 160#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 161#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 162 163/* First non-reserved inode for old ext2 filesystems */ 164#define EXT2_GOOD_OLD_FIRST_INO 11 165 166static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 167{ 168 return sb->s_fs_info; 169} 170 171/* 172 * Macro-instructions used to manage several block sizes 173 */ 174#define EXT2_MIN_BLOCK_SIZE 1024 175#define EXT2_MAX_BLOCK_SIZE 4096 176#define EXT2_MIN_BLOCK_LOG_SIZE 10 177#define EXT2_MAX_BLOCK_LOG_SIZE 16 178#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 179#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 180#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 181#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 182#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 183#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 184 185/* 186 * Structure of a blocks group descriptor 187 */ 188struct ext2_group_desc 189{ 190 __le32 bg_block_bitmap; /* Blocks bitmap block */ 191 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 192 __le32 bg_inode_table; /* Inodes table block */ 193 __le16 bg_free_blocks_count; /* Free blocks count */ 194 __le16 bg_free_inodes_count; /* Free inodes count */ 195 __le16 bg_used_dirs_count; /* Directories count */ 196 __le16 bg_pad; 197 __le32 bg_reserved[3]; 198}; 199 200/* 201 * Macro-instructions used to manage group descriptors 202 */ 203#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 204#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 205#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 206#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 207 208/* 209 * Constants relative to the data blocks 210 */ 211#define EXT2_NDIR_BLOCKS 12 212#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 213#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 214#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 215#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 216 217/* 218 * Inode flags (GETFLAGS/SETFLAGS) 219 */ 220#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 221#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 222#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 223#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 224#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 225#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 226#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 227#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 228/* Reserved for compression usage... */ 229#define EXT2_DIRTY_FL FS_DIRTY_FL 230#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 231#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 232#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 233/* End compression flags --- maybe not all used */ 234#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 235#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 236#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 237#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 238#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 239#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 240#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 241#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 242 243#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 244#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 245 246/* Flags that should be inherited by new inodes from their parent. */ 247#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 248 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 249 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 250 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 251 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 252 253/* Flags that are appropriate for regular files (all but dir-specific ones). */ 254#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 255 256/* Flags that are appropriate for non-directories/regular files. */ 257#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 258 259/* Mask out flags that are inappropriate for the given type of inode. */ 260static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 261{ 262 if (S_ISDIR(mode)) 263 return flags; 264 else if (S_ISREG(mode)) 265 return flags & EXT2_REG_FLMASK; 266 else 267 return flags & EXT2_OTHER_FLMASK; 268} 269 270/* 271 * ioctl commands 272 */ 273#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 274#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 275#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 276#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 277#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 278#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 279 280/* 281 * ioctl commands in 32 bit emulation 282 */ 283#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 284#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 285#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 286#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 287 288/* 289 * Structure of an inode on the disk 290 */ 291struct ext2_inode { 292 __le16 i_mode; /* File mode */ 293 __le16 i_uid; /* Low 16 bits of Owner Uid */ 294 __le32 i_size; /* Size in bytes */ 295 __le32 i_atime; /* Access time */ 296 __le32 i_ctime; /* Creation time */ 297 __le32 i_mtime; /* Modification time */ 298 __le32 i_dtime; /* Deletion Time */ 299 __le16 i_gid; /* Low 16 bits of Group Id */ 300 __le16 i_links_count; /* Links count */ 301 __le32 i_blocks; /* Blocks count */ 302 __le32 i_flags; /* File flags */ 303 union { 304 struct { 305 __le32 l_i_reserved1; 306 } linux1; 307 struct { 308 __le32 h_i_translator; 309 } hurd1; 310 struct { 311 __le32 m_i_reserved1; 312 } masix1; 313 } osd1; /* OS dependent 1 */ 314 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 315 __le32 i_generation; /* File version (for NFS) */ 316 __le32 i_file_acl; /* File ACL */ 317 __le32 i_dir_acl; /* Directory ACL */ 318 __le32 i_faddr; /* Fragment address */ 319 union { 320 struct { 321 __u8 l_i_frag; /* Fragment number */ 322 __u8 l_i_fsize; /* Fragment size */ 323 __u16 i_pad1; 324 __le16 l_i_uid_high; /* these 2 fields */ 325 __le16 l_i_gid_high; /* were reserved2[0] */ 326 __u32 l_i_reserved2; 327 } linux2; 328 struct { 329 __u8 h_i_frag; /* Fragment number */ 330 __u8 h_i_fsize; /* Fragment size */ 331 __le16 h_i_mode_high; 332 __le16 h_i_uid_high; 333 __le16 h_i_gid_high; 334 __le32 h_i_author; 335 } hurd2; 336 struct { 337 __u8 m_i_frag; /* Fragment number */ 338 __u8 m_i_fsize; /* Fragment size */ 339 __u16 m_pad1; 340 __u32 m_i_reserved2[2]; 341 } masix2; 342 } osd2; /* OS dependent 2 */ 343}; 344 345#define i_size_high i_dir_acl 346 347#define i_reserved1 osd1.linux1.l_i_reserved1 348#define i_frag osd2.linux2.l_i_frag 349#define i_fsize osd2.linux2.l_i_fsize 350#define i_uid_low i_uid 351#define i_gid_low i_gid 352#define i_uid_high osd2.linux2.l_i_uid_high 353#define i_gid_high osd2.linux2.l_i_gid_high 354#define i_reserved2 osd2.linux2.l_i_reserved2 355 356/* 357 * File system states 358 */ 359#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 360#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 361#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 362 363/* 364 * Mount flags 365 */ 366#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 367#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 368#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 369#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 370#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 371#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 372#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 373#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 374#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 375#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 376#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 377#define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 378#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 379#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 380#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 381#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 382 383 384#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 385#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 386#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 387 EXT2_MOUNT_##opt) 388/* 389 * Maximal mount counts between two filesystem checks 390 */ 391#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 392#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 393 394/* 395 * Behaviour when detecting errors 396 */ 397#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 398#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 399#define EXT2_ERRORS_PANIC 3 /* Panic */ 400#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 401 402/* 403 * Structure of the super block 404 */ 405struct ext2_super_block { 406 __le32 s_inodes_count; /* Inodes count */ 407 __le32 s_blocks_count; /* Blocks count */ 408 __le32 s_r_blocks_count; /* Reserved blocks count */ 409 __le32 s_free_blocks_count; /* Free blocks count */ 410 __le32 s_free_inodes_count; /* Free inodes count */ 411 __le32 s_first_data_block; /* First Data Block */ 412 __le32 s_log_block_size; /* Block size */ 413 __le32 s_log_frag_size; /* Fragment size */ 414 __le32 s_blocks_per_group; /* # Blocks per group */ 415 __le32 s_frags_per_group; /* # Fragments per group */ 416 __le32 s_inodes_per_group; /* # Inodes per group */ 417 __le32 s_mtime; /* Mount time */ 418 __le32 s_wtime; /* Write time */ 419 __le16 s_mnt_count; /* Mount count */ 420 __le16 s_max_mnt_count; /* Maximal mount count */ 421 __le16 s_magic; /* Magic signature */ 422 __le16 s_state; /* File system state */ 423 __le16 s_errors; /* Behaviour when detecting errors */ 424 __le16 s_minor_rev_level; /* minor revision level */ 425 __le32 s_lastcheck; /* time of last check */ 426 __le32 s_checkinterval; /* max. time between checks */ 427 __le32 s_creator_os; /* OS */ 428 __le32 s_rev_level; /* Revision level */ 429 __le16 s_def_resuid; /* Default uid for reserved blocks */ 430 __le16 s_def_resgid; /* Default gid for reserved blocks */ 431 /* 432 * These fields are for EXT2_DYNAMIC_REV superblocks only. 433 * 434 * Note: the difference between the compatible feature set and 435 * the incompatible feature set is that if there is a bit set 436 * in the incompatible feature set that the kernel doesn't 437 * know about, it should refuse to mount the filesystem. 438 * 439 * e2fsck's requirements are more strict; if it doesn't know 440 * about a feature in either the compatible or incompatible 441 * feature set, it must abort and not try to meddle with 442 * things it doesn't understand... 443 */ 444 __le32 s_first_ino; /* First non-reserved inode */ 445 __le16 s_inode_size; /* size of inode structure */ 446 __le16 s_block_group_nr; /* block group # of this superblock */ 447 __le32 s_feature_compat; /* compatible feature set */ 448 __le32 s_feature_incompat; /* incompatible feature set */ 449 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 450 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 451 char s_volume_name[16]; /* volume name */ 452 char s_last_mounted[64]; /* directory where last mounted */ 453 __le32 s_algorithm_usage_bitmap; /* For compression */ 454 /* 455 * Performance hints. Directory preallocation should only 456 * happen if the EXT2_COMPAT_PREALLOC flag is on. 457 */ 458 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 459 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 460 __u16 s_padding1; 461 /* 462 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 463 */ 464 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 465 __u32 s_journal_inum; /* inode number of journal file */ 466 __u32 s_journal_dev; /* device number of journal file */ 467 __u32 s_last_orphan; /* start of list of inodes to delete */ 468 __u32 s_hash_seed[4]; /* HTREE hash seed */ 469 __u8 s_def_hash_version; /* Default hash version to use */ 470 __u8 s_reserved_char_pad; 471 __u16 s_reserved_word_pad; 472 __le32 s_default_mount_opts; 473 __le32 s_first_meta_bg; /* First metablock block group */ 474 __u32 s_reserved[190]; /* Padding to the end of the block */ 475}; 476 477/* 478 * Codes for operating systems 479 */ 480#define EXT2_OS_LINUX 0 481#define EXT2_OS_HURD 1 482#define EXT2_OS_MASIX 2 483#define EXT2_OS_FREEBSD 3 484#define EXT2_OS_LITES 4 485 486/* 487 * Revision levels 488 */ 489#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 490#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 491 492#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 493#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 494 495#define EXT2_GOOD_OLD_INODE_SIZE 128 496 497/* 498 * Feature set definitions 499 */ 500 501#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 502 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 503#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 504 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 505#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 506 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 507#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 508 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 509#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 510 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 511#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 512 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 513#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 514 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 515#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 516 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 517#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 518 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 519 520#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 521#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 522#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 523#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 524#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 525#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 526#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 527 528#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 529#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 530#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 531#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 532 533#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 534#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 535#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 536#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 537#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 538#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 539 540#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 541#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 542 EXT2_FEATURE_INCOMPAT_META_BG) 543#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 544 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 545 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 546#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 547#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 548 549/* 550 * Default values for user and/or group using reserved blocks 551 */ 552#define EXT2_DEF_RESUID 0 553#define EXT2_DEF_RESGID 0 554 555/* 556 * Default mount options 557 */ 558#define EXT2_DEFM_DEBUG 0x0001 559#define EXT2_DEFM_BSDGROUPS 0x0002 560#define EXT2_DEFM_XATTR_USER 0x0004 561#define EXT2_DEFM_ACL 0x0008 562#define EXT2_DEFM_UID16 0x0010 563 /* Not used by ext2, but reserved for use by ext3 */ 564#define EXT3_DEFM_JMODE 0x0060 565#define EXT3_DEFM_JMODE_DATA 0x0020 566#define EXT3_DEFM_JMODE_ORDERED 0x0040 567#define EXT3_DEFM_JMODE_WBACK 0x0060 568 569/* 570 * Structure of a directory entry 571 */ 572 573struct ext2_dir_entry { 574 __le32 inode; /* Inode number */ 575 __le16 rec_len; /* Directory entry length */ 576 __le16 name_len; /* Name length */ 577 char name[]; /* File name, up to EXT2_NAME_LEN */ 578}; 579 580/* 581 * The new version of the directory entry. Since EXT2 structures are 582 * stored in intel byte order, and the name_len field could never be 583 * bigger than 255 chars, it's safe to reclaim the extra byte for the 584 * file_type field. 585 */ 586struct ext2_dir_entry_2 { 587 __le32 inode; /* Inode number */ 588 __le16 rec_len; /* Directory entry length */ 589 __u8 name_len; /* Name length */ 590 __u8 file_type; 591 char name[]; /* File name, up to EXT2_NAME_LEN */ 592}; 593 594/* 595 * EXT2_DIR_PAD defines the directory entries boundaries 596 * 597 * NOTE: It must be a multiple of 4 598 */ 599#define EXT2_DIR_PAD 4 600#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 601#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 602 ~EXT2_DIR_ROUND) 603#define EXT2_MAX_REC_LEN ((1<<16)-1) 604 605static inline void verify_offsets(void) 606{ 607#define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 608 A(EXT2_SB_MAGIC_OFFSET, s_magic); 609 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 610 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 611#undef A 612} 613 614/* 615 * ext2 mount options 616 */ 617struct ext2_mount_options { 618 unsigned long s_mount_opt; 619 kuid_t s_resuid; 620 kgid_t s_resgid; 621}; 622 623/* 624 * second extended file system inode data in memory 625 */ 626struct ext2_inode_info { 627 __le32 i_data[15]; 628 __u32 i_flags; 629 __u32 i_faddr; 630 __u8 i_frag_no; 631 __u8 i_frag_size; 632 __u16 i_state; 633 __u32 i_file_acl; 634 __u32 i_dir_acl; 635 __u32 i_dtime; 636 637 /* 638 * i_block_group is the number of the block group which contains 639 * this file's inode. Constant across the lifetime of the inode, 640 * it is used for making block allocation decisions - we try to 641 * place a file's data blocks near its inode block, and new inodes 642 * near to their parent directory's inode. 643 */ 644 __u32 i_block_group; 645 646 /* block reservation info */ 647 struct ext2_block_alloc_info *i_block_alloc_info; 648 649 __u32 i_dir_start_lookup; 650#ifdef CONFIG_EXT2_FS_XATTR 651 /* 652 * Extended attributes can be read independently of the main file 653 * data. Taking i_mutex even when reading would cause contention 654 * between readers of EAs and writers of regular file data, so 655 * instead we synchronize on xattr_sem when reading or changing 656 * EAs. 657 */ 658 struct rw_semaphore xattr_sem; 659#endif 660 rwlock_t i_meta_lock; 661#ifdef CONFIG_FS_DAX 662 struct rw_semaphore dax_sem; 663#endif 664 665 /* 666 * truncate_mutex is for serialising ext2_truncate() against 667 * ext2_getblock(). It also protects the internals of the inode's 668 * reservation data structures: ext2_reserve_window and 669 * ext2_reserve_window_node. 670 */ 671 struct mutex truncate_mutex; 672 struct inode vfs_inode; 673 struct list_head i_orphan; /* unlinked but open inodes */ 674#ifdef CONFIG_QUOTA 675 struct dquot *i_dquot[MAXQUOTAS]; 676#endif 677}; 678 679#ifdef CONFIG_FS_DAX 680#define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) 681#define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) 682#else 683#define dax_sem_down_write(ext2_inode) 684#define dax_sem_up_write(ext2_inode) 685#endif 686 687/* 688 * Inode dynamic state flags 689 */ 690#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 691 692 693/* 694 * Function prototypes 695 */ 696 697/* 698 * Ok, these declarations are also in <linux/kernel.h> but none of the 699 * ext2 source programs needs to include it so they are duplicated here. 700 */ 701 702static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 703{ 704 return container_of(inode, struct ext2_inode_info, vfs_inode); 705} 706 707/* balloc.c */ 708extern int ext2_bg_has_super(struct super_block *sb, int group); 709extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 710extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 711extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 712 unsigned long *, int *); 713extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 714 unsigned int count); 715extern void ext2_free_blocks (struct inode *, unsigned long, 716 unsigned long); 717extern unsigned long ext2_count_free_blocks (struct super_block *); 718extern unsigned long ext2_count_dirs (struct super_block *); 719extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 720 unsigned int block_group, 721 struct buffer_head ** bh); 722extern void ext2_discard_reservation (struct inode *); 723extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 724extern void ext2_init_block_alloc_info(struct inode *); 725extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 726 727/* dir.c */ 728extern int ext2_add_link (struct dentry *, struct inode *); 729extern int ext2_inode_by_name(struct inode *dir, 730 const struct qstr *child, ino_t *ino); 731extern int ext2_make_empty(struct inode *, struct inode *); 732extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); 733extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 734extern int ext2_empty_dir (struct inode *); 735extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 736extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 737 738/* ialloc.c */ 739extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 740extern void ext2_free_inode (struct inode *); 741extern unsigned long ext2_count_free_inodes (struct super_block *); 742extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 743 744/* inode.c */ 745extern struct inode *ext2_iget (struct super_block *, unsigned long); 746extern int ext2_write_inode (struct inode *, struct writeback_control *); 747extern void ext2_evict_inode(struct inode *); 748extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 749extern int ext2_setattr (struct dentry *, struct iattr *); 750extern int ext2_getattr (const struct path *, struct kstat *, u32, unsigned int); 751extern void ext2_set_inode_flags(struct inode *inode); 752extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 753 u64 start, u64 len); 754 755/* ioctl.c */ 756extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 757extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 758 759/* namei.c */ 760struct dentry *ext2_get_parent(struct dentry *child); 761 762/* super.c */ 763extern __printf(3, 4) 764void ext2_error(struct super_block *, const char *, const char *, ...); 765extern __printf(3, 4) 766void ext2_msg(struct super_block *, const char *, const char *, ...); 767extern void ext2_update_dynamic_rev (struct super_block *sb); 768extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 769 int wait); 770 771/* 772 * Inodes and files operations 773 */ 774 775/* dir.c */ 776extern const struct file_operations ext2_dir_operations; 777 778/* file.c */ 779extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 780 int datasync); 781extern const struct inode_operations ext2_file_inode_operations; 782extern const struct file_operations ext2_file_operations; 783 784/* inode.c */ 785extern void ext2_set_file_ops(struct inode *inode); 786extern const struct address_space_operations ext2_aops; 787extern const struct address_space_operations ext2_nobh_aops; 788extern const struct iomap_ops ext2_iomap_ops; 789 790/* namei.c */ 791extern const struct inode_operations ext2_dir_inode_operations; 792extern const struct inode_operations ext2_special_inode_operations; 793 794/* symlink.c */ 795extern const struct inode_operations ext2_fast_symlink_inode_operations; 796extern const struct inode_operations ext2_symlink_inode_operations; 797 798static inline ext2_fsblk_t 799ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 800{ 801 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 802 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 803} 804 805static inline ext2_fsblk_t 806ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) 807{ 808 struct ext2_sb_info *sbi = EXT2_SB(sb); 809 810 if (group_no == sbi->s_groups_count - 1) 811 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 812 else 813 return ext2_group_first_block_no(sb, group_no) + 814 EXT2_BLOCKS_PER_GROUP(sb) - 1; 815} 816 817#define ext2_set_bit __test_and_set_bit_le 818#define ext2_clear_bit __test_and_clear_bit_le 819#define ext2_test_bit test_bit_le 820#define ext2_find_first_zero_bit find_first_zero_bit_le 821#define ext2_find_next_zero_bit find_next_zero_bit_le 822