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#include <linux/mm.h> 20#include <linux/highmem.h> 21 22/* XXX Here for now... not interested in restructing headers JUST now */ 23 24/* data type for block offset of block group */ 25typedef int ext2_grpblk_t; 26 27/* data type for filesystem-wide blocks number */ 28typedef unsigned long ext2_fsblk_t; 29 30#define E2FSBLK "%lu" 31 32struct ext2_reserve_window { 33 ext2_fsblk_t _rsv_start; /* First byte reserved */ 34 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 35}; 36 37struct ext2_reserve_window_node { 38 struct rb_node rsv_node; 39 __u32 rsv_goal_size; 40 __u32 rsv_alloc_hit; 41 struct ext2_reserve_window rsv_window; 42}; 43 44struct ext2_block_alloc_info { 45 /* information about reservation window */ 46 struct ext2_reserve_window_node rsv_window_node; 47 /* 48 * was i_next_alloc_block in ext2_inode_info 49 * is the logical (file-relative) number of the 50 * most-recently-allocated block in this file. 51 * We use this for detecting linearly ascending allocation requests. 52 */ 53 __u32 last_alloc_logical_block; 54 /* 55 * Was i_next_alloc_goal in ext2_inode_info 56 * is the *physical* companion to i_next_alloc_block. 57 * it is the physical block number of the block which was most-recently 58 * allocated to this file. This gives us the goal (target) for the next 59 * allocation when we detect linearly ascending requests. 60 */ 61 ext2_fsblk_t last_alloc_physical_block; 62}; 63 64#define rsv_start rsv_window._rsv_start 65#define rsv_end rsv_window._rsv_end 66 67struct mb_cache; 68 69/* 70 * second extended-fs super-block data in memory 71 */ 72struct ext2_sb_info { 73 unsigned long s_inodes_per_block;/* Number of inodes per block */ 74 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 75 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 76 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 77 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 78 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 79 unsigned long s_groups_count; /* Number of groups in the fs */ 80 unsigned long s_overhead_last; /* Last calculated overhead */ 81 unsigned long s_blocks_last; /* Last seen block count */ 82 struct buffer_head * s_sbh; /* Buffer containing the super block */ 83 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 84 struct buffer_head ** s_group_desc; 85 unsigned long s_mount_opt; 86 unsigned long s_sb_block; 87 kuid_t s_resuid; 88 kgid_t s_resgid; 89 unsigned short s_mount_state; 90 unsigned short s_pad; 91 int s_addr_per_block_bits; 92 int s_desc_per_block_bits; 93 int s_inode_size; 94 int s_first_ino; 95 spinlock_t s_next_gen_lock; 96 u32 s_next_generation; 97 unsigned long s_dir_count; 98 u8 *s_debts; 99 struct percpu_counter s_freeblocks_counter; 100 struct percpu_counter s_freeinodes_counter; 101 struct percpu_counter s_dirs_counter; 102 struct blockgroup_lock *s_blockgroup_lock; 103 /* root of the per fs reservation window tree */ 104 spinlock_t s_rsv_window_lock; 105 struct rb_root s_rsv_window_root; 106 struct ext2_reserve_window_node s_rsv_window_head; 107 /* 108 * s_lock protects against concurrent modifications of s_mount_state, 109 * s_blocks_last, s_overhead_last and the content of superblock's 110 * buffer pointed to by sbi->s_es. 111 * 112 * Note: It is used in ext2_show_options() to provide a consistent view 113 * of the mount options. 114 */ 115 spinlock_t s_lock; 116 struct mb_cache *s_ea_block_cache; 117 struct dax_device *s_daxdev; 118 u64 s_dax_part_off; 119}; 120 121static inline spinlock_t * 122sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 123{ 124 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 125} 126 127/* 128 * Define EXT2FS_DEBUG to produce debug messages 129 */ 130#undef EXT2FS_DEBUG 131 132/* 133 * Define EXT2_RESERVATION to reserve data blocks for expanding files 134 */ 135#define EXT2_DEFAULT_RESERVE_BLOCKS 8 136/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 137#define EXT2_MAX_RESERVE_BLOCKS 1027 138#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 139/* 140 * The second extended file system version 141 */ 142#define EXT2FS_DATE "95/08/09" 143#define EXT2FS_VERSION "0.5b" 144 145/* 146 * Debug code 147 */ 148#ifdef EXT2FS_DEBUG 149# define ext2_debug(f, a...) { \ 150 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 151 __FILE__, __LINE__, __func__); \ 152 printk (f, ## a); \ 153 } 154#else 155# define ext2_debug(f, a...) /**/ 156#endif 157 158/* 159 * Special inode numbers 160 */ 161#define EXT2_BAD_INO 1 /* Bad blocks inode */ 162#define EXT2_ROOT_INO 2 /* Root inode */ 163#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 164#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 165 166/* First non-reserved inode for old ext2 filesystems */ 167#define EXT2_GOOD_OLD_FIRST_INO 11 168 169static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 170{ 171 return sb->s_fs_info; 172} 173 174/* 175 * Macro-instructions used to manage several block sizes 176 */ 177#define EXT2_MIN_BLOCK_SIZE 1024 178#define EXT2_MAX_BLOCK_SIZE 65536 179#define EXT2_MIN_BLOCK_LOG_SIZE 10 180#define EXT2_MAX_BLOCK_LOG_SIZE 16 181#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 182#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 183#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 184#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 185#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 186#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 187 188/* 189 * Structure of a blocks group descriptor 190 */ 191struct ext2_group_desc 192{ 193 __le32 bg_block_bitmap; /* Blocks bitmap block */ 194 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 195 __le32 bg_inode_table; /* Inodes table block */ 196 __le16 bg_free_blocks_count; /* Free blocks count */ 197 __le16 bg_free_inodes_count; /* Free inodes count */ 198 __le16 bg_used_dirs_count; /* Directories count */ 199 __le16 bg_pad; 200 __le32 bg_reserved[3]; 201}; 202 203/* 204 * Macro-instructions used to manage group descriptors 205 */ 206#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 207#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 208#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 209#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 210 211/* 212 * Constants relative to the data blocks 213 */ 214#define EXT2_NDIR_BLOCKS 12 215#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 216#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 217#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 218#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 219 220/* 221 * Inode flags (GETFLAGS/SETFLAGS) 222 */ 223#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 224#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 225#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 226#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 227#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 228#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 229#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 230#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 231/* Reserved for compression usage... */ 232#define EXT2_DIRTY_FL FS_DIRTY_FL 233#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 234#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 235#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 236/* End compression flags --- maybe not all used */ 237#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 238#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 239#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 240#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 241#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 242#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 243#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 244#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 245 246#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 247#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 248 249/* Flags that should be inherited by new inodes from their parent. */ 250#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 251 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 252 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 253 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 254 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 255 256/* Flags that are appropriate for regular files (all but dir-specific ones). */ 257#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 258 259/* Flags that are appropriate for non-directories/regular files. */ 260#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 261 262/* Mask out flags that are inappropriate for the given type of inode. */ 263static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 264{ 265 if (S_ISDIR(mode)) 266 return flags; 267 else if (S_ISREG(mode)) 268 return flags & EXT2_REG_FLMASK; 269 else 270 return flags & EXT2_OTHER_FLMASK; 271} 272 273/* 274 * ioctl commands 275 */ 276#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 277#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 278#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 279#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 280 281/* 282 * ioctl commands in 32 bit emulation 283 */ 284#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 285#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 286 287/* 288 * Structure of an inode on the disk 289 */ 290struct ext2_inode { 291 __le16 i_mode; /* File mode */ 292 __le16 i_uid; /* Low 16 bits of Owner Uid */ 293 __le32 i_size; /* Size in bytes */ 294 __le32 i_atime; /* Access time */ 295 __le32 i_ctime; /* Creation time */ 296 __le32 i_mtime; /* Modification time */ 297 __le32 i_dtime; /* Deletion Time */ 298 __le16 i_gid; /* Low 16 bits of Group Id */ 299 __le16 i_links_count; /* Links count */ 300 __le32 i_blocks; /* Blocks count */ 301 __le32 i_flags; /* File flags */ 302 union { 303 struct { 304 __le32 l_i_reserved1; 305 } linux1; 306 struct { 307 __le32 h_i_translator; 308 } hurd1; 309 struct { 310 __le32 m_i_reserved1; 311 } masix1; 312 } osd1; /* OS dependent 1 */ 313 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 314 __le32 i_generation; /* File version (for NFS) */ 315 __le32 i_file_acl; /* File ACL */ 316 __le32 i_dir_acl; /* Directory ACL */ 317 __le32 i_faddr; /* Fragment address */ 318 union { 319 struct { 320 __u8 l_i_frag; /* Fragment number */ 321 __u8 l_i_fsize; /* Fragment size */ 322 __u16 i_pad1; 323 __le16 l_i_uid_high; /* these 2 fields */ 324 __le16 l_i_gid_high; /* were reserved2[0] */ 325 __u32 l_i_reserved2; 326 } linux2; 327 struct { 328 __u8 h_i_frag; /* Fragment number */ 329 __u8 h_i_fsize; /* Fragment size */ 330 __le16 h_i_mode_high; 331 __le16 h_i_uid_high; 332 __le16 h_i_gid_high; 333 __le32 h_i_author; 334 } hurd2; 335 struct { 336 __u8 m_i_frag; /* Fragment number */ 337 __u8 m_i_fsize; /* Fragment size */ 338 __u16 m_pad1; 339 __u32 m_i_reserved2[2]; 340 } masix2; 341 } osd2; /* OS dependent 2 */ 342}; 343 344#define i_size_high i_dir_acl 345 346#define i_reserved1 osd1.linux1.l_i_reserved1 347#define i_frag osd2.linux2.l_i_frag 348#define i_fsize osd2.linux2.l_i_fsize 349#define i_uid_low i_uid 350#define i_gid_low i_gid 351#define i_uid_high osd2.linux2.l_i_uid_high 352#define i_gid_high osd2.linux2.l_i_gid_high 353#define i_reserved2 osd2.linux2.l_i_reserved2 354 355/* 356 * File system states 357 */ 358#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 359#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 360#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 361 362/* 363 * Mount flags 364 */ 365#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 366#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 367#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 368#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 369#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 370#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 371#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 372#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 373#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 374#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 375#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 376#define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 377#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 378#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 379#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 380#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 381 382 383#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 384#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 385#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 386 EXT2_MOUNT_##opt) 387/* 388 * Maximal mount counts between two filesystem checks 389 */ 390#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 391#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 392 393/* 394 * Behaviour when detecting errors 395 */ 396#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 397#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 398#define EXT2_ERRORS_PANIC 3 /* Panic */ 399#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 400 401/* 402 * Allocation flags 403 */ 404#define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation 405 * window for allocation */ 406 407/* 408 * Structure of the super block 409 */ 410struct ext2_super_block { 411 __le32 s_inodes_count; /* Inodes count */ 412 __le32 s_blocks_count; /* Blocks count */ 413 __le32 s_r_blocks_count; /* Reserved blocks count */ 414 __le32 s_free_blocks_count; /* Free blocks count */ 415 __le32 s_free_inodes_count; /* Free inodes count */ 416 __le32 s_first_data_block; /* First Data Block */ 417 __le32 s_log_block_size; /* Block size */ 418 __le32 s_log_frag_size; /* Fragment size */ 419 __le32 s_blocks_per_group; /* # Blocks per group */ 420 __le32 s_frags_per_group; /* # Fragments per group */ 421 __le32 s_inodes_per_group; /* # Inodes per group */ 422 __le32 s_mtime; /* Mount time */ 423 __le32 s_wtime; /* Write time */ 424 __le16 s_mnt_count; /* Mount count */ 425 __le16 s_max_mnt_count; /* Maximal mount count */ 426 __le16 s_magic; /* Magic signature */ 427 __le16 s_state; /* File system state */ 428 __le16 s_errors; /* Behaviour when detecting errors */ 429 __le16 s_minor_rev_level; /* minor revision level */ 430 __le32 s_lastcheck; /* time of last check */ 431 __le32 s_checkinterval; /* max. time between checks */ 432 __le32 s_creator_os; /* OS */ 433 __le32 s_rev_level; /* Revision level */ 434 __le16 s_def_resuid; /* Default uid for reserved blocks */ 435 __le16 s_def_resgid; /* Default gid for reserved blocks */ 436 /* 437 * These fields are for EXT2_DYNAMIC_REV superblocks only. 438 * 439 * Note: the difference between the compatible feature set and 440 * the incompatible feature set is that if there is a bit set 441 * in the incompatible feature set that the kernel doesn't 442 * know about, it should refuse to mount the filesystem. 443 * 444 * e2fsck's requirements are more strict; if it doesn't know 445 * about a feature in either the compatible or incompatible 446 * feature set, it must abort and not try to meddle with 447 * things it doesn't understand... 448 */ 449 __le32 s_first_ino; /* First non-reserved inode */ 450 __le16 s_inode_size; /* size of inode structure */ 451 __le16 s_block_group_nr; /* block group # of this superblock */ 452 __le32 s_feature_compat; /* compatible feature set */ 453 __le32 s_feature_incompat; /* incompatible feature set */ 454 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 455 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 456 char s_volume_name[16]; /* volume name */ 457 char s_last_mounted[64]; /* directory where last mounted */ 458 __le32 s_algorithm_usage_bitmap; /* For compression */ 459 /* 460 * Performance hints. Directory preallocation should only 461 * happen if the EXT2_COMPAT_PREALLOC flag is on. 462 */ 463 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 464 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 465 __u16 s_padding1; 466 /* 467 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 468 */ 469 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 470 __u32 s_journal_inum; /* inode number of journal file */ 471 __u32 s_journal_dev; /* device number of journal file */ 472 __u32 s_last_orphan; /* start of list of inodes to delete */ 473 __u32 s_hash_seed[4]; /* HTREE hash seed */ 474 __u8 s_def_hash_version; /* Default hash version to use */ 475 __u8 s_reserved_char_pad; 476 __u16 s_reserved_word_pad; 477 __le32 s_default_mount_opts; 478 __le32 s_first_meta_bg; /* First metablock block group */ 479 __u32 s_reserved[190]; /* Padding to the end of the block */ 480}; 481 482/* 483 * Codes for operating systems 484 */ 485#define EXT2_OS_LINUX 0 486#define EXT2_OS_HURD 1 487#define EXT2_OS_MASIX 2 488#define EXT2_OS_FREEBSD 3 489#define EXT2_OS_LITES 4 490 491/* 492 * Revision levels 493 */ 494#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 495#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 496 497#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 498#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 499 500#define EXT2_GOOD_OLD_INODE_SIZE 128 501 502/* 503 * Feature set definitions 504 */ 505 506#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 507 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 508#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 509 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 510#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 511 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 512#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 513 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 514#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 515 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 516#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 517 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 518#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 519 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 520#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 521 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 522#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 523 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 524 525#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 526#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 527#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 528#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 529#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 530#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 531#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 532 533#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 534#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 535#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 536#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 537 538#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 539#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 540#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 541#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 542#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 543#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 544 545#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 546#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 547 EXT2_FEATURE_INCOMPAT_META_BG) 548#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 549 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 550 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 551#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 552#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 553 554/* 555 * Default values for user and/or group using reserved blocks 556 */ 557#define EXT2_DEF_RESUID 0 558#define EXT2_DEF_RESGID 0 559 560/* 561 * Default mount options 562 */ 563#define EXT2_DEFM_DEBUG 0x0001 564#define EXT2_DEFM_BSDGROUPS 0x0002 565#define EXT2_DEFM_XATTR_USER 0x0004 566#define EXT2_DEFM_ACL 0x0008 567#define EXT2_DEFM_UID16 0x0010 568 /* Not used by ext2, but reserved for use by ext3 */ 569#define EXT3_DEFM_JMODE 0x0060 570#define EXT3_DEFM_JMODE_DATA 0x0020 571#define EXT3_DEFM_JMODE_ORDERED 0x0040 572#define EXT3_DEFM_JMODE_WBACK 0x0060 573 574/* 575 * Structure of a directory entry 576 */ 577 578struct ext2_dir_entry { 579 __le32 inode; /* Inode number */ 580 __le16 rec_len; /* Directory entry length */ 581 __le16 name_len; /* Name length */ 582 char name[]; /* File name, up to EXT2_NAME_LEN */ 583}; 584 585/* 586 * The new version of the directory entry. Since EXT2 structures are 587 * stored in intel byte order, and the name_len field could never be 588 * bigger than 255 chars, it's safe to reclaim the extra byte for the 589 * file_type field. 590 */ 591struct ext2_dir_entry_2 { 592 __le32 inode; /* Inode number */ 593 __le16 rec_len; /* Directory entry length */ 594 __u8 name_len; /* Name length */ 595 __u8 file_type; 596 char name[]; /* File name, up to EXT2_NAME_LEN */ 597}; 598 599/* 600 * EXT2_DIR_PAD defines the directory entries boundaries 601 * 602 * NOTE: It must be a multiple of 4 603 */ 604#define EXT2_DIR_PAD 4 605#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 606#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 607 ~EXT2_DIR_ROUND) 608#define EXT2_MAX_REC_LEN ((1<<16)-1) 609 610static inline void verify_offsets(void) 611{ 612#define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 613 A(EXT2_SB_MAGIC_OFFSET, s_magic); 614 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 615 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 616#undef A 617} 618 619/* 620 * ext2 mount options 621 */ 622struct ext2_mount_options { 623 unsigned long s_mount_opt; 624 kuid_t s_resuid; 625 kgid_t s_resgid; 626}; 627 628/* 629 * second extended file system inode data in memory 630 */ 631struct ext2_inode_info { 632 __le32 i_data[15]; 633 __u32 i_flags; 634 __u32 i_faddr; 635 __u8 i_frag_no; 636 __u8 i_frag_size; 637 __u16 i_state; 638 __u32 i_file_acl; 639 __u32 i_dir_acl; 640 __u32 i_dtime; 641 642 /* 643 * i_block_group is the number of the block group which contains 644 * this file's inode. Constant across the lifetime of the inode, 645 * it is used for making block allocation decisions - we try to 646 * place a file's data blocks near its inode block, and new inodes 647 * near to their parent directory's inode. 648 */ 649 __u32 i_block_group; 650 651 /* block reservation info */ 652 struct ext2_block_alloc_info *i_block_alloc_info; 653 654 __u32 i_dir_start_lookup; 655#ifdef CONFIG_EXT2_FS_XATTR 656 /* 657 * Extended attributes can be read independently of the main file 658 * data. Taking i_mutex even when reading would cause contention 659 * between readers of EAs and writers of regular file data, so 660 * instead we synchronize on xattr_sem when reading or changing 661 * EAs. 662 */ 663 struct rw_semaphore xattr_sem; 664#endif 665 rwlock_t i_meta_lock; 666 667 /* 668 * truncate_mutex is for serialising ext2_truncate() against 669 * ext2_getblock(). It also protects the internals of the inode's 670 * reservation data structures: ext2_reserve_window and 671 * ext2_reserve_window_node. 672 */ 673 struct mutex truncate_mutex; 674 struct inode vfs_inode; 675 struct list_head i_orphan; /* unlinked but open inodes */ 676#ifdef CONFIG_QUOTA 677 struct dquot __rcu *i_dquot[MAXQUOTAS]; 678#endif 679}; 680 681/* 682 * Inode dynamic state flags 683 */ 684#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 685 686 687/* 688 * Function prototypes 689 */ 690 691/* 692 * Ok, these declarations are also in <linux/kernel.h> but none of the 693 * ext2 source programs needs to include it so they are duplicated here. 694 */ 695 696static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 697{ 698 return container_of(inode, struct ext2_inode_info, vfs_inode); 699} 700 701/* balloc.c */ 702extern int ext2_bg_has_super(struct super_block *sb, int group); 703extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 704extern ext2_fsblk_t ext2_new_blocks(struct inode *, ext2_fsblk_t, 705 unsigned long *, int *, unsigned int); 706extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 707 unsigned int count); 708extern void ext2_free_blocks(struct inode *, ext2_fsblk_t, unsigned long); 709extern unsigned long ext2_count_free_blocks (struct super_block *); 710extern unsigned long ext2_count_dirs (struct super_block *); 711extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 712 unsigned int block_group, 713 struct buffer_head ** bh); 714extern void ext2_discard_reservation (struct inode *); 715extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 716extern void ext2_init_block_alloc_info(struct inode *); 717extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 718 719/* dir.c */ 720int ext2_add_link(struct dentry *, struct inode *); 721int ext2_inode_by_name(struct inode *dir, 722 const struct qstr *child, ino_t *ino); 723int ext2_make_empty(struct inode *, struct inode *); 724struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *, 725 struct folio **foliop); 726int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio); 727int ext2_empty_dir(struct inode *); 728struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop); 729int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de, 730 struct folio *folio, struct inode *inode, bool update_times); 731 732/* ialloc.c */ 733extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 734extern void ext2_free_inode (struct inode *); 735extern unsigned long ext2_count_free_inodes (struct super_block *); 736extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 737 738/* inode.c */ 739extern struct inode *ext2_iget (struct super_block *, unsigned long); 740extern int ext2_write_inode (struct inode *, struct writeback_control *); 741extern void ext2_evict_inode(struct inode *); 742void ext2_write_failed(struct address_space *mapping, loff_t to); 743extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 744extern int ext2_setattr (struct mnt_idmap *, struct dentry *, struct iattr *); 745extern int ext2_getattr (struct mnt_idmap *, const struct path *, 746 struct kstat *, u32, unsigned int); 747extern void ext2_set_inode_flags(struct inode *inode); 748extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 749 u64 start, u64 len); 750 751/* ioctl.c */ 752extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa); 753extern int ext2_fileattr_set(struct mnt_idmap *idmap, 754 struct dentry *dentry, struct fileattr *fa); 755extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 756extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 757 758/* namei.c */ 759struct dentry *ext2_get_parent(struct dentry *child); 760 761/* super.c */ 762extern __printf(3, 4) 763void ext2_error(struct super_block *, const char *, const char *, ...); 764extern __printf(3, 4) 765void ext2_msg(struct super_block *, const char *, const char *, ...); 766extern void ext2_update_dynamic_rev (struct super_block *sb); 767extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 768 int wait); 769 770/* 771 * Inodes and files operations 772 */ 773 774/* dir.c */ 775extern const struct file_operations ext2_dir_operations; 776 777/* file.c */ 778extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 779 int datasync); 780extern const struct inode_operations ext2_file_inode_operations; 781extern const struct file_operations ext2_file_operations; 782 783/* inode.c */ 784extern void ext2_set_file_ops(struct inode *inode); 785extern const struct address_space_operations ext2_aops; 786extern const struct iomap_ops ext2_iomap_ops; 787 788/* namei.c */ 789extern const struct inode_operations ext2_dir_inode_operations; 790extern const struct inode_operations ext2_special_inode_operations; 791 792/* symlink.c */ 793extern const struct inode_operations ext2_fast_symlink_inode_operations; 794extern const struct inode_operations ext2_symlink_inode_operations; 795 796static inline ext2_fsblk_t 797ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 798{ 799 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 800 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 801} 802 803static inline ext2_fsblk_t 804ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) 805{ 806 struct ext2_sb_info *sbi = EXT2_SB(sb); 807 808 if (group_no == sbi->s_groups_count - 1) 809 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 810 else 811 return ext2_group_first_block_no(sb, group_no) + 812 EXT2_BLOCKS_PER_GROUP(sb) - 1; 813} 814 815#define ext2_set_bit __test_and_set_bit_le 816#define ext2_clear_bit __test_and_clear_bit_le 817#define ext2_test_bit test_bit_le 818#define ext2_find_first_zero_bit find_first_zero_bit_le 819#define ext2_find_next_zero_bit find_next_zero_bit_le 820