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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (C) 1992, 1993, 1994, 19954 * Remy Card (card@masi.ibp.fr)5 * Laboratoire MASI - Institut Blaise Pascal6 * Universite Pierre et Marie Curie (Paris VI)7 *8 * from9 *10 * linux/include/linux/minix_fs.h11 *12 * Copyright (C) 1991, 1992 Linus Torvalds13 */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_info49 * is the logical (file-relative) number of the50 * 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_info56 * is the *physical* companion to i_next_alloc_block.57 * it is the physical block number of the block which was most-recently58 * allocated to this file. This gives us the goal (target) for the next59 * 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_start65#define rsv_end rsv_window._rsv_end66 67struct mb_cache;68 69/*70 * second extended-fs super-block data in memory71 */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's110 * buffer pointed to by sbi->s_es.111 *112 * Note: It is used in ext2_show_options() to provide a consistent view113 * 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 messages129 */130#undef EXT2FS_DEBUG131 132/*133 * Define EXT2_RESERVATION to reserve data blocks for expanding files134 */135#define EXT2_DEFAULT_RESERVE_BLOCKS 8136/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */137#define EXT2_MAX_RESERVE_BLOCKS 1027138#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0139/*140 * The second extended file system version141 */142#define EXT2FS_DATE "95/08/09"143#define EXT2FS_VERSION "0.5b"144 145/*146 * Debug code147 */148#ifdef EXT2FS_DEBUG149# define ext2_debug(f, a...) { \150 printk ("EXT2-fs DEBUG (%s, %d): %s:", \151 __FILE__, __LINE__, __func__); \152 printk (f, ## a); \153 }154#else155# define ext2_debug(f, a...) /**/156#endif157 158/*159 * Special inode numbers160 */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 11168 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 sizes176 */177#define EXT2_MIN_BLOCK_SIZE 1024178#define EXT2_MAX_BLOCK_SIZE 65536179#define EXT2_MIN_BLOCK_LOG_SIZE 10180#define EXT2_MAX_BLOCK_LOG_SIZE 16181#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 descriptor190 */191struct ext2_group_desc192{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 descriptors205 */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 blocks213 */214#define EXT2_NDIR_BLOCKS 12215#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS216#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_FL233#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 else270 return flags & EXT2_OTHER_FLMASK;271}272 273/*274 * ioctl commands275 */276#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION277#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION278#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 emulation283 */284#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION285#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION286 287/*288 * Structure of an inode on the disk289 */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_acl345 346#define i_reserved1 osd1.linux1.l_i_reserved1347#define i_frag osd2.linux2.l_i_frag348#define i_fsize osd2.linux2.l_i_fsize349#define i_uid_low i_uid350#define i_gid_low i_gid351#define i_uid_high osd2.linux2.l_i_uid_high352#define i_gid_high osd2.linux2.l_i_gid_high353#define i_reserved2 osd2.linux2.l_i_reserved2354 355/*356 * File system states357 */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 flags364 */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_##opt384#define set_opt(o, opt) o |= EXT2_MOUNT_##opt385#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \386 EXT2_MOUNT_##opt)387/*388 * Maximal mount counts between two filesystem checks389 */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 errors395 */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_CONTINUE400 401/*402 * Allocation flags403 */404#define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation405 * window for allocation */406 407/*408 * Structure of the super block409 */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 and440 * the incompatible feature set is that if there is a bit set441 * in the incompatible feature set that the kernel doesn't442 * know about, it should refuse to mount the filesystem.443 * 444 * e2fsck's requirements are more strict; if it doesn't know445 * about a feature in either the compatible or incompatible446 * feature set, it must abort and not try to meddle with447 * 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 only461 * 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 systems484 */485#define EXT2_OS_LINUX 0486#define EXT2_OS_HURD 1487#define EXT2_OS_MASIX 2488#define EXT2_OS_FREEBSD 3489#define EXT2_OS_LITES 4490 491/*492 * Revision levels493 */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_REV498#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV499 500#define EXT2_GOOD_OLD_INODE_SIZE 128501 502/*503 * Feature set definitions504 */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 0x0001526#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002527#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004528#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008529#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010530#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020531#define EXT2_FEATURE_COMPAT_ANY 0xffffffff532 533#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001534#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002535#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004536#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff537 538#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001539#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002540#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004541#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008542#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010543#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff544 545#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR546#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_SUPP552#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP553 554/*555 * Default values for user and/or group using reserved blocks556 */557#define EXT2_DEF_RESUID 0558#define EXT2_DEF_RESGID 0559 560/*561 * Default mount options562 */563#define EXT2_DEFM_DEBUG 0x0001564#define EXT2_DEFM_BSDGROUPS 0x0002565#define EXT2_DEFM_XATTR_USER 0x0004566#define EXT2_DEFM_ACL 0x0008567#define EXT2_DEFM_UID16 0x0010568 /* Not used by ext2, but reserved for use by ext3 */569#define EXT3_DEFM_JMODE 0x0060 570#define EXT3_DEFM_JMODE_DATA 0x0020571#define EXT3_DEFM_JMODE_ORDERED 0x0040572#define EXT3_DEFM_JMODE_WBACK 0x0060573 574/*575 * Structure of a directory entry576 */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 are587 * stored in intel byte order, and the name_len field could never be588 * bigger than 255 chars, it's safe to reclaim the extra byte for the589 * 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 boundaries601 *602 * NOTE: It must be a multiple of 4603 */604#define EXT2_DIR_PAD 4605#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 A617}618 619/*620 * ext2 mount options621 */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 memory630 */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 contains644 * this file's inode. Constant across the lifetime of the inode,645 * it is used for making block allocation decisions - we try to646 * place a file's data blocks near its inode block, and new inodes647 * 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_XATTR656 /*657 * Extended attributes can be read independently of the main file658 * data. Taking i_mutex even when reading would cause contention659 * between readers of EAs and writers of regular file data, so660 * instead we synchronize on xattr_sem when reading or changing661 * EAs.662 */663 struct rw_semaphore xattr_sem;664#endif665 rwlock_t i_meta_lock;666 667 /*668 * truncate_mutex is for serialising ext2_truncate() against669 * ext2_getblock(). It also protects the internals of the inode's670 * reservation data structures: ext2_reserve_window and671 * 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_QUOTA677 struct dquot __rcu *i_dquot[MAXQUOTAS];678#endif679};680 681/*682 * Inode dynamic state flags683 */684#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */685 686 687/*688 * Function prototypes689 */690 691/*692 * Ok, these declarations are also in <linux/kernel.h> but none of the693 * 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 operations772 */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_t797ext2_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_t804ext2_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 else811 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_le816#define ext2_clear_bit __test_and_clear_bit_le817#define ext2_test_bit test_bit_le818#define ext2_find_first_zero_bit find_first_zero_bit_le819#define ext2_find_next_zero_bit find_next_zero_bit_le820