fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/refcount.h>
  21 #include <linux/types.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/magic.h>
  24 #include <linux/jbd2.h>
  25 #include <linux/quota.h>
  26 #include <linux/rwsem.h>
  27 #include <linux/rbtree.h>
  28 #include <linux/seqlock.h>
  29 #include <linux/mutex.h>
  30 #include <linux/timer.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #include <linux/fiemap.h>
  40 #ifdef __KERNEL__
  41 #include <linux/compat.h>
  42 #endif
  43
  44 #include <linux/fscrypt.h>
  45 #include <linux/fsverity.h>
  46
  47 #include <linux/compiler.h>
  48
  49 /*
  50  * The fourth extended filesystem constants/structures
  51  */
  52
  53 /*
  54  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  55  * structures. these checks slow things down a lot
  56  */
  57 #define AGGRESSIVE_CHECK__
  58
  59 /*
  60  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  61  * bitmaps, maintains and uses them to check for double allocations
  62  */
  63 #define DOUBLE_CHECK__
  64
  65 /*
  66  * Define EXT4FS_DEBUG to produce debug messages
  67  */
  68 #undef EXT4FS_DEBUG
  69
  70 /*
  71  * Debug code
  72  */
  73 #ifdef EXT4FS_DEBUG
  74 #define ext4_debug(f, a...)                                             \
  75         do {                                                            \
  76                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  77                         __FILE__, __LINE__, __func__);                  \
  78                 printk(KERN_DEBUG f, ## a);                             \
  79         } while (0)
  80 #else
  81 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  82 #endif
  83
  84  /*
  85   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  86   */
  87 #define EXT_DEBUG__
  88
  89 /*
  90  * Dynamic printk for controlled extents debugging.
  91  */
  92 #ifdef CONFIG_EXT4_DEBUG
  93 #define ext_debug(ino, fmt, ...)                                        \
  94         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  95                  current->comm, task_pid_nr(current),                   \
  96                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  97                  __func__, ##__VA_ARGS__)
  98 #else
  99 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
 100 #endif
 101
 102 #define ASSERT(assert)                                          \
 103 do {                                                                    \
 104         if (unlikely(!(assert))) {                                      \
 105                 printk(KERN_EMERG                                       \
 106                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 107                        __func__, __FILE__, __LINE__, #assert);          \
 108                 BUG();                                                  \
 109         }                                                               \
 110 } while (0)
 111
 112 /* data type for block offset of block group */
 113 typedef int ext4_grpblk_t;
 114
 115 /* data type for filesystem-wide blocks number */
 116 typedef unsigned long long ext4_fsblk_t;
 117
 118 /* data type for file logical block number */
 119 typedef __u32 ext4_lblk_t;
 120
 121 /* data type for block group number */
 122 typedef unsigned int ext4_group_t;
 123
 124 enum SHIFT_DIRECTION {
 125         SHIFT_LEFT = 0,
 126         SHIFT_RIGHT,
 127 };
 128
 129 /*
 130  * Flags used in mballoc's allocation_context flags field.
 131  *
 132  * Also used to show what's going on for debugging purposes when the
 133  * flag field is exported via the traceport interface
 134  */
 135
 136 /* prefer goal again. length */
 137 #define EXT4_MB_HINT_MERGE              0x0001
 138 /* blocks already reserved */
 139 #define EXT4_MB_HINT_RESERVED           0x0002
 140 /* metadata is being allocated */
 141 #define EXT4_MB_HINT_METADATA           0x0004
 142 /* first blocks in the file */
 143 #define EXT4_MB_HINT_FIRST              0x0008
 144 /* search for the best chunk */
 145 #define EXT4_MB_HINT_BEST               0x0010
 146 /* data is being allocated */
 147 #define EXT4_MB_HINT_DATA               0x0020
 148 /* don't preallocate (for tails) */
 149 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 150 /* allocate for locality group */
 151 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 152 /* allocate goal blocks or none */
 153 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 154 /* goal is meaningful */
 155 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 156 /* blocks already pre-reserved by delayed allocation */
 157 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 158 /* We are doing stream allocation */
 159 #define EXT4_MB_STREAM_ALLOC            0x0800
 160 /* Use reserved root blocks if needed */
 161 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 162 /* Use blocks from reserved pool */
 163 #define EXT4_MB_USE_RESERVED            0x2000
 164 /* Do strict check for free blocks while retrying block allocation */
 165 #define EXT4_MB_STRICT_CHECK            0x4000
 166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
 167 #define EXT4_MB_CR0_OPTIMIZED           0x8000
 168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
 169 #define EXT4_MB_CR1_OPTIMIZED           0x00010000
 170 /* Perform linear traversal for one group */
 171 #define EXT4_MB_SEARCH_NEXT_LINEAR      0x00020000
 172 struct ext4_allocation_request {
 173         /* target inode for block we're allocating */
 174         struct inode *inode;
 175         /* how many blocks we want to allocate */
 176         unsigned int len;
 177         /* logical block in target inode */
 178         ext4_lblk_t logical;
 179         /* the closest logical allocated block to the left */
 180         ext4_lblk_t lleft;
 181         /* the closest logical allocated block to the right */
 182         ext4_lblk_t lright;
 183         /* phys. target (a hint) */
 184         ext4_fsblk_t goal;
 185         /* phys. block for the closest logical allocated block to the left */
 186         ext4_fsblk_t pleft;
 187         /* phys. block for the closest logical allocated block to the right */
 188         ext4_fsblk_t pright;
 189         /* flags. see above EXT4_MB_HINT_* */
 190         unsigned int flags;
 191 };
 192
 193 /*
 194  * Logical to physical block mapping, used by ext4_map_blocks()
 195  *
 196  * This structure is used to pass requests into ext4_map_blocks() as
 197  * well as to store the information returned by ext4_map_blocks().  It
 198  * takes less room on the stack than a struct buffer_head.
 199  */
 200 #define EXT4_MAP_NEW            BIT(BH_New)
 201 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 202 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 203 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 204 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 205                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 206
 207 struct ext4_map_blocks {
 208         ext4_fsblk_t m_pblk;
 209         ext4_lblk_t m_lblk;
 210         unsigned int m_len;
 211         unsigned int m_flags;
 212 };
 213
 214 /*
 215  * Block validity checking, system zone rbtree.
 216  */
 217 struct ext4_system_blocks {
 218         struct rb_root root;
 219         struct rcu_head rcu;
 220 };
 221
 222 /*
 223  * Flags for ext4_io_end->flags
 224  */
 225 #define EXT4_IO_END_UNWRITTEN   0x0001
 226
 227 struct ext4_io_end_vec {
 228         struct list_head list;          /* list of io_end_vec */
 229         loff_t offset;                  /* offset in the file */
 230         ssize_t size;                   /* size of the extent */
 231 };
 232
 233 /*
 234  * For converting unwritten extents on a work queue. 'handle' is used for
 235  * buffered writeback.
 236  */
 237 typedef struct ext4_io_end {
 238         struct list_head        list;           /* per-file finished IO list */
 239         handle_t                *handle;        /* handle reserved for extent
 240                                                  * conversion */
 241         struct inode            *inode;         /* file being written to */
 242         struct bio              *bio;           /* Linked list of completed
 243                                                  * bios covering the extent */
 244         unsigned int            flag;           /* unwritten or not */
 245         refcount_t              count;          /* reference counter */
 246         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 247 } ext4_io_end_t;
 248
 249 struct ext4_io_submit {
 250         struct writeback_control *io_wbc;
 251         struct bio              *io_bio;
 252         ext4_io_end_t           *io_end;
 253         sector_t                io_next_block;
 254 };
 255
 256 /*
 257  * Special inodes numbers
 258  */
 259 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 260 #define EXT4_ROOT_INO            2      /* Root inode */
 261 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 262 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 263 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 264 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 265 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 266 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 267
 268 /* First non-reserved inode for old ext4 filesystems */
 269 #define EXT4_GOOD_OLD_FIRST_INO 11
 270
 271 /*
 272  * Maximal count of links to a file
 273  */
 274 #define EXT4_LINK_MAX           65000
 275
 276 /*
 277  * Macro-instructions used to manage several block sizes
 278  */
 279 #define EXT4_MIN_BLOCK_SIZE             1024
 280 #define EXT4_MAX_BLOCK_SIZE             65536
 281 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 282 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 283 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 284 #ifdef __KERNEL__
 285 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 286 #else
 287 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 288 #endif
 289 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 290 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 291                                          EXT4_SB(s)->s_cluster_bits)
 292 #ifdef __KERNEL__
 293 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 294 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 295 #else
 296 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 297 #endif
 298 #ifdef __KERNEL__
 299 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 300 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 301 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 302 #else
 303 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 304                                  EXT4_GOOD_OLD_INODE_SIZE : \
 305                                  (s)->s_inode_size)
 306 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 307                                  EXT4_GOOD_OLD_FIRST_INO : \
 308                                  (s)->s_first_ino)
 309 #endif
 310 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 312         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 313                                                                   blkbits))
 314
 315 /* Translate a block number to a cluster number */
 316 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 317 /* Translate a cluster number to a block number */
 318 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 319 /* Translate # of blks to # of clusters */
 320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 321                                  (sbi)->s_cluster_bits)
 322 /* Mask out the low bits to get the starting block of the cluster */
 323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 324                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 326                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 327 /* Fill in the low bits to get the last block of the cluster */
 328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 329                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 330 /* Get the cluster offset */
 331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 332                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 334                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 335
 336 /*
 337  * Structure of a blocks group descriptor
 338  */
 339 struct ext4_group_desc
 340 {
 341         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 342         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 343         __le32  bg_inode_table_lo;      /* Inodes table block */
 344         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 345         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 346         __le16  bg_used_dirs_count_lo;  /* Directories count */
 347         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 348         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 349         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 350         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 351         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 352         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 353         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 354         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 355         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 356         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 357         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 358         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 359         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 360         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 361         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 362         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 363         __u32   bg_reserved;
 364 };
 365
 366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 367         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 368          sizeof(__le16))
 369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 370         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 371          sizeof(__le16))
 372
 373 /*
 374  * Structure of a flex block group info
 375  */
 376
 377 struct flex_groups {
 378         atomic64_t      free_clusters;
 379         atomic_t        free_inodes;
 380         atomic_t        used_dirs;
 381 };
 382
 383 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 384 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 385 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 386
 387 /*
 388  * Macro-instructions used to manage group descriptors
 389  */
 390 #define EXT4_MIN_DESC_SIZE              32
 391 #define EXT4_MIN_DESC_SIZE_64BIT        64
 392 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 393 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 394 #ifdef __KERNEL__
 395 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 396 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 397 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 398 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 399 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 400 #else
 401 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 402 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 403 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 404 #endif
 405
 406 /*
 407  * Constants relative to the data blocks
 408  */
 409 #define EXT4_NDIR_BLOCKS                12
 410 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 411 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 412 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 413 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 414
 415 /*
 416  * Inode flags
 417  */
 418 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 419 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 420 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 421 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 422 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 423 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 424 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 425 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 426 /* Reserved for compression usage... */
 427 #define EXT4_DIRTY_FL                   0x00000100
 428 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 429 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 430         /* nb: was previously EXT2_ECOMPR_FL */
 431 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 432 /* End compression flags --- maybe not all used */
 433 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 434 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 435 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 436 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 437 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 438 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 439 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 440 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 441 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 442 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 444
 445 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 446
 447 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 448 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 449 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 450 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 451
 452 /* User modifiable flags */
 453 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 454                                          EXT4_UNRM_FL | \
 455                                          EXT4_COMPR_FL | \
 456                                          EXT4_SYNC_FL | \
 457                                          EXT4_IMMUTABLE_FL | \
 458                                          EXT4_APPEND_FL | \
 459                                          EXT4_NODUMP_FL | \
 460                                          EXT4_NOATIME_FL | \
 461                                          EXT4_JOURNAL_DATA_FL | \
 462                                          EXT4_NOTAIL_FL | \
 463                                          EXT4_DIRSYNC_FL | \
 464                                          EXT4_TOPDIR_FL | \
 465                                          EXT4_EXTENTS_FL | \
 466                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 467                                          EXT4_DAX_FL | \
 468                                          EXT4_PROJINHERIT_FL | \
 469                                          EXT4_CASEFOLD_FL)
 470
 471 /* User visible flags */
 472 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 473                                          EXT4_DIRTY_FL | \
 474                                          EXT4_COMPRBLK_FL | \
 475                                          EXT4_NOCOMPR_FL | \
 476                                          EXT4_ENCRYPT_FL | \
 477                                          EXT4_INDEX_FL | \
 478                                          EXT4_VERITY_FL | \
 479                                          EXT4_INLINE_DATA_FL)
 480
 481 /* Flags that should be inherited by new inodes from their parent. */
 482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 483                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 484                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 485                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 486                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 487                            EXT4_DAX_FL)
 488
 489 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 491                            EXT4_PROJINHERIT_FL))
 492
 493 /* Flags that are appropriate for non-directories/regular files. */
 494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 495
 496 /* The only flags that should be swapped */
 497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 498
 499 /* Flags which are mutually exclusive to DAX */
 500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 501                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 502
 503 /* Mask out flags that are inappropriate for the given type of inode. */
 504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 505 {
 506         if (S_ISDIR(mode))
 507                 return flags;
 508         else if (S_ISREG(mode))
 509                 return flags & EXT4_REG_FLMASK;
 510         else
 511                 return flags & EXT4_OTHER_FLMASK;
 512 }
 513
 514 /*
 515  * Inode flags used for atomic set/get
 516  */
 517 enum {
 518         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 519         EXT4_INODE_UNRM         = 1,    /* Undelete */
 520         EXT4_INODE_COMPR        = 2,    /* Compress file */
 521         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 522         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 523         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 524         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 525         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 526 /* Reserved for compression usage... */
 527         EXT4_INODE_DIRTY        = 8,
 528         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 529         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 530         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 531 /* End compression flags --- maybe not all used */
 532         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 533         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 534         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 535         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 536         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 537         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 538         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 539         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 540         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 541         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 543         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 544         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 545         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 546         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 547         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 548 };
 549
 550 /*
 551  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 552  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 553  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 554  * any extra space in the compiled kernel image, otherwise, the build will fail.
 555  * It's important that these values are the same, since we are using
 556  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 557  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 558  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 559  * defined in e2fsprogs.
 560  *
 561  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 562  */
 563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 565
 566 static inline void ext4_check_flag_values(void)
 567 {
 568         CHECK_FLAG_VALUE(SECRM);
 569         CHECK_FLAG_VALUE(UNRM);
 570         CHECK_FLAG_VALUE(COMPR);
 571         CHECK_FLAG_VALUE(SYNC);
 572         CHECK_FLAG_VALUE(IMMUTABLE);
 573         CHECK_FLAG_VALUE(APPEND);
 574         CHECK_FLAG_VALUE(NODUMP);
 575         CHECK_FLAG_VALUE(NOATIME);
 576         CHECK_FLAG_VALUE(DIRTY);
 577         CHECK_FLAG_VALUE(COMPRBLK);
 578         CHECK_FLAG_VALUE(NOCOMPR);
 579         CHECK_FLAG_VALUE(ENCRYPT);
 580         CHECK_FLAG_VALUE(INDEX);
 581         CHECK_FLAG_VALUE(IMAGIC);
 582         CHECK_FLAG_VALUE(JOURNAL_DATA);
 583         CHECK_FLAG_VALUE(NOTAIL);
 584         CHECK_FLAG_VALUE(DIRSYNC);
 585         CHECK_FLAG_VALUE(TOPDIR);
 586         CHECK_FLAG_VALUE(HUGE_FILE);
 587         CHECK_FLAG_VALUE(EXTENTS);
 588         CHECK_FLAG_VALUE(VERITY);
 589         CHECK_FLAG_VALUE(EA_INODE);
 590         CHECK_FLAG_VALUE(INLINE_DATA);
 591         CHECK_FLAG_VALUE(PROJINHERIT);
 592         CHECK_FLAG_VALUE(CASEFOLD);
 593         CHECK_FLAG_VALUE(RESERVED);
 594 }
 595
 596 /* Used to pass group descriptor data when online resize is done */
 597 struct ext4_new_group_input {
 598         __u32 group;            /* Group number for this data */
 599         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 600         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 601         __u64 inode_table;      /* Absolute block number of inode table start */
 602         __u32 blocks_count;     /* Total number of blocks in this group */
 603         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 604         __u16 unused;
 605 };
 606
 607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 608 struct compat_ext4_new_group_input {
 609         u32 group;
 610         compat_u64 block_bitmap;
 611         compat_u64 inode_bitmap;
 612         compat_u64 inode_table;
 613         u32 blocks_count;
 614         u16 reserved_blocks;
 615         u16 unused;
 616 };
 617 #endif
 618
 619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 620 struct ext4_new_group_data {
 621         __u32 group;
 622         __u64 block_bitmap;
 623         __u64 inode_bitmap;
 624         __u64 inode_table;
 625         __u32 blocks_count;
 626         __u16 reserved_blocks;
 627         __u16 mdata_blocks;
 628         __u32 free_clusters_count;
 629 };
 630
 631 /* Indexes used to index group tables in ext4_new_group_data */
 632 enum {
 633         BLOCK_BITMAP = 0,       /* block bitmap */
 634         INODE_BITMAP,           /* inode bitmap */
 635         INODE_TABLE,            /* inode tables */
 636         GROUP_TABLE_COUNT,
 637 };
 638
 639 /*
 640  * Flags used by ext4_map_blocks()
 641  */
 642         /* Allocate any needed blocks and/or convert an unwritten
 643            extent to be an initialized ext4 */
 644 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 645         /* Request the creation of an unwritten extent */
 646 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 648                                                  EXT4_GET_BLOCKS_CREATE)
 649         /* Caller is from the delayed allocation writeout path
 650          * finally doing the actual allocation of delayed blocks */
 651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 652         /* caller is from the direct IO path, request to creation of an
 653         unwritten extents if not allocated, split the unwritten
 654         extent if blocks has been preallocated already*/
 655 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 656 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 658                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 659         /* Convert extent to initialized after IO complete */
 660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 661                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 662         /* Eventual metadata allocation (due to growing extent tree)
 663          * should not fail, so try to use reserved blocks for that.*/
 664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 665         /* Don't normalize allocation size (used for fallocate) */
 666 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 667         /* Convert written extents to unwritten */
 668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 669         /* Write zeros to newly created written extents */
 670 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 671 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 672                                         EXT4_GET_BLOCKS_ZERO)
 673         /* Caller will submit data before dropping transaction handle. This
 674          * allows jbd2 to avoid submitting data before commit. */
 675 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 676
 677 /*
 678  * The bit position of these flags must not overlap with any of the
 679  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 680  * read_extent_tree_block(), ext4_split_extent_at(),
 681  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 682  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 683  * caching the extents when reading from the extent tree while a
 684  * truncate or punch hole operation is in progress.
 685  */
 686 #define EXT4_EX_NOCACHE                         0x40000000
 687 #define EXT4_EX_FORCE_CACHE                     0x20000000
 688 #define EXT4_EX_NOFAIL                          0x10000000
 689
 690 /*
 691  * Flags used by ext4_free_blocks
 692  */
 693 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 694 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 695 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 696 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 697 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 698 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 699 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 700
 701 /*
 702  * ioctl commands
 703  */
 704 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 705 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 706 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 707 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 708 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 709 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 710 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 711 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 712 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 713  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 714  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 715 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 716 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 717 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 718 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 719 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 720 /* ioctl codes 19--39 are reserved for fscrypt */
 721 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 722 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 723 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 724 #define EXT4_IOC_CHECKPOINT             _IOW('f', 43, __u32)
 725
 726 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 727
 728 /*
 729  * Flags for going down operation
 730  */
 731 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 732 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 733 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 734
 735 /*
 736  * Flags returned by EXT4_IOC_GETSTATE
 737  *
 738  * We only expose to userspace a subset of the state flags in
 739  * i_state_flags
 740  */
 741 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 742 #define EXT4_STATE_FLAG_NEW             0x00000002
 743 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 744 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 745
 746 /* flags for ioctl EXT4_IOC_CHECKPOINT */
 747 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD        0x1
 748 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT        0x2
 749 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN        0x4
 750 #define EXT4_IOC_CHECKPOINT_FLAG_VALID          (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
 751                                                 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
 752                                                 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
 753
 754 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 755 /*
 756  * ioctl commands in 32 bit emulation
 757  */
 758 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 759 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 760 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 761 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 762 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 763 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 764 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 765 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 766 #endif
 767
 768 /*
 769  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 770  * It indicates that the entry in extent status cache is for a hole.
 771  */
 772 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 773
 774 /* Max physical block we can address w/o extents */
 775 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 776
 777 /* Max logical block we can support */
 778 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 779
 780 /*
 781  * Structure of an inode on the disk
 782  */
 783 struct ext4_inode {
 784         __le16  i_mode;         /* File mode */
 785         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 786         __le32  i_size_lo;      /* Size in bytes */
 787         __le32  i_atime;        /* Access time */
 788         __le32  i_ctime;        /* Inode Change time */
 789         __le32  i_mtime;        /* Modification time */
 790         __le32  i_dtime;        /* Deletion Time */
 791         __le16  i_gid;          /* Low 16 bits of Group Id */
 792         __le16  i_links_count;  /* Links count */
 793         __le32  i_blocks_lo;    /* Blocks count */
 794         __le32  i_flags;        /* File flags */
 795         union {
 796                 struct {
 797                         __le32  l_i_version;
 798                 } linux1;
 799                 struct {
 800                         __u32  h_i_translator;
 801                 } hurd1;
 802                 struct {
 803                         __u32  m_i_reserved1;
 804                 } masix1;
 805         } osd1;                         /* OS dependent 1 */
 806         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 807         __le32  i_generation;   /* File version (for NFS) */
 808         __le32  i_file_acl_lo;  /* File ACL */
 809         __le32  i_size_high;
 810         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 811         union {
 812                 struct {
 813                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 814                         __le16  l_i_file_acl_high;
 815                         __le16  l_i_uid_high;   /* these 2 fields */
 816                         __le16  l_i_gid_high;   /* were reserved2[0] */
 817                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 818                         __le16  l_i_reserved;
 819                 } linux2;
 820                 struct {
 821                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 822                         __u16   h_i_mode_high;
 823                         __u16   h_i_uid_high;
 824                         __u16   h_i_gid_high;
 825                         __u32   h_i_author;
 826                 } hurd2;
 827                 struct {
 828                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 829                         __le16  m_i_file_acl_high;
 830                         __u32   m_i_reserved2[2];
 831                 } masix2;
 832         } osd2;                         /* OS dependent 2 */
 833         __le16  i_extra_isize;
 834         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 835         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 836         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 837         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 838         __le32  i_crtime;       /* File Creation time */
 839         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 840         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 841         __le32  i_projid;       /* Project ID */
 842 };
 843
 844 struct move_extent {
 845         __u32 reserved;         /* should be zero */
 846         __u32 donor_fd;         /* donor file descriptor */
 847         __u64 orig_start;       /* logical start offset in block for orig */
 848         __u64 donor_start;      /* logical start offset in block for donor */
 849         __u64 len;              /* block length to be moved */
 850         __u64 moved_len;        /* moved block length */
 851 };
 852
 853 #define EXT4_EPOCH_BITS 2
 854 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 855 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 856
 857 /*
 858  * Extended fields will fit into an inode if the filesystem was formatted
 859  * with large inodes (-I 256 or larger) and there are not currently any EAs
 860  * consuming all of the available space. For new inodes we always reserve
 861  * enough space for the kernel's known extended fields, but for inodes
 862  * created with an old kernel this might not have been the case. None of
 863  * the extended inode fields is critical for correct filesystem operation.
 864  * This macro checks if a certain field fits in the inode. Note that
 865  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 866  */
 867 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 868         ((offsetof(typeof(*ext4_inode), field) +        \
 869           sizeof((ext4_inode)->field))                  \
 870         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 871             (einode)->i_extra_isize))                   \
 872
 873 /*
 874  * We use an encoding that preserves the times for extra epoch "00":
 875  *
 876  * extra  msb of                         adjust for signed
 877  * epoch  32-bit                         32-bit tv_sec to
 878  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 879  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 880  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 881  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 882  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 883  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 884  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 885  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 886  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 887  *
 888  * Note that previous versions of the kernel on 64-bit systems would
 889  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 890  * 1970.  e2fsck will correct this, assuming that it is run on the
 891  * affected filesystem before 2242.
 892  */
 893
 894 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 895 {
 896         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 897         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 898 }
 899
 900 static inline void ext4_decode_extra_time(struct timespec64 *time,
 901                                           __le32 extra)
 902 {
 903         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 904                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 905         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 906 }
 907
 908 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 909 do {                                                                            \
 910         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 911                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 912                 (raw_inode)->xtime ## _extra =                                  \
 913                                 ext4_encode_extra_time(&(inode)->xtime);        \
 914                 }                                                               \
 915         else    \
 916                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 917 } while (0)
 918
 919 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 920 do {                                                                           \
 921         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 922                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 923         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 924                 (raw_inode)->xtime ## _extra =                                 \
 925                                 ext4_encode_extra_time(&(einode)->xtime);      \
 926 } while (0)
 927
 928 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 929 do {                                                                            \
 930         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 931         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 932                 ext4_decode_extra_time(&(inode)->xtime,                         \
 933                                        raw_inode->xtime ## _extra);             \
 934                 }                                                               \
 935         else                                                                    \
 936                 (inode)->xtime.tv_nsec = 0;                                     \
 937 } while (0)
 938
 939
 940 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 941 do {                                                                           \
 942         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 943                 (einode)->xtime.tv_sec =                                       \
 944                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 945         else                                                                   \
 946                 (einode)->xtime.tv_sec = 0;                                    \
 947         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 948                 ext4_decode_extra_time(&(einode)->xtime,                       \
 949                                        raw_inode->xtime ## _extra);            \
 950         else                                                                   \
 951                 (einode)->xtime.tv_nsec = 0;                                   \
 952 } while (0)
 953
 954 #define i_disk_version osd1.linux1.l_i_version
 955
 956 #if defined(__KERNEL__) || defined(__linux__)
 957 #define i_reserved1     osd1.linux1.l_i_reserved1
 958 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 959 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 960 #define i_uid_low       i_uid
 961 #define i_gid_low       i_gid
 962 #define i_uid_high      osd2.linux2.l_i_uid_high
 963 #define i_gid_high      osd2.linux2.l_i_gid_high
 964 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 965
 966 #elif defined(__GNU__)
 967
 968 #define i_translator    osd1.hurd1.h_i_translator
 969 #define i_uid_high      osd2.hurd2.h_i_uid_high
 970 #define i_gid_high      osd2.hurd2.h_i_gid_high
 971 #define i_author        osd2.hurd2.h_i_author
 972
 973 #elif defined(__masix__)
 974
 975 #define i_reserved1     osd1.masix1.m_i_reserved1
 976 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 977 #define i_reserved2     osd2.masix2.m_i_reserved2
 978
 979 #endif /* defined(__KERNEL__) || defined(__linux__) */
 980
 981 #include "extents_status.h"
 982 #include "fast_commit.h"
 983
 984 /*
 985  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 986  *
 987  * These are needed to avoid lockdep false positives when we need to
 988  * allocate blocks to the quota inode during ext4_map_blocks(), while
 989  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 990  * do quota tracking for the quota inode, this avoids deadlock (as
 991  * well as infinite recursion, since it isn't turtles all the way
 992  * down...)
 993  *
 994  *  I_DATA_SEM_NORMAL - Used for most inodes
 995  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 996  *                        where the second inode has larger inode number
 997  *                        than the first
 998  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 999  */
1000 enum {
1001         I_DATA_SEM_NORMAL = 0,
1002         I_DATA_SEM_OTHER,
1003         I_DATA_SEM_QUOTA,
1004 };
1005
1006
1007 /*
1008  * fourth extended file system inode data in memory
1009  */
1010 struct ext4_inode_info {
1011         __le32  i_data[15];     /* unconverted */
1012         __u32   i_dtime;
1013         ext4_fsblk_t    i_file_acl;
1014
1015         /*
1016          * i_block_group is the number of the block group which contains
1017          * this file's inode.  Constant across the lifetime of the inode,
1018          * it is used for making block allocation decisions - we try to
1019          * place a file's data blocks near its inode block, and new inodes
1020          * near to their parent directory's inode.
1021          */
1022         ext4_group_t    i_block_group;
1023         ext4_lblk_t     i_dir_start_lookup;
1024 #if (BITS_PER_LONG < 64)
1025         unsigned long   i_state_flags;          /* Dynamic state flags */
1026 #endif
1027         unsigned long   i_flags;
1028
1029         /*
1030          * Extended attributes can be read independently of the main file
1031          * data. Taking i_rwsem even when reading would cause contention
1032          * between readers of EAs and writers of regular file data, so
1033          * instead we synchronize on xattr_sem when reading or changing
1034          * EAs.
1035          */
1036         struct rw_semaphore xattr_sem;
1037
1038         /*
1039          * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1040          * i_orphan is used.
1041          */
1042         union {
1043                 struct list_head i_orphan;      /* unlinked but open inodes */
1044                 unsigned int i_orphan_idx;      /* Index in orphan file */
1045         };
1046
1047         /* Fast commit related info */
1048
1049         /* For tracking dentry create updates */
1050         struct list_head i_fc_dilist;
1051         struct list_head i_fc_list;     /*
1052                                          * inodes that need fast commit
1053                                          * protected by sbi->s_fc_lock.
1054                                          */
1055
1056         /* Start of lblk range that needs to be committed in this fast commit */
1057         ext4_lblk_t i_fc_lblk_start;
1058
1059         /* End of lblk range that needs to be committed in this fast commit */
1060         ext4_lblk_t i_fc_lblk_len;
1061
1062         /* Number of ongoing updates on this inode */
1063         atomic_t  i_fc_updates;
1064
1065         /* Fast commit wait queue for this inode */
1066         wait_queue_head_t i_fc_wait;
1067
1068         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1069         struct mutex i_fc_lock;
1070
1071         /*
1072          * i_disksize keeps track of what the inode size is ON DISK, not
1073          * in memory.  During truncate, i_size is set to the new size by
1074          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1075          * set i_disksize to 0 until the truncate is actually under way.
1076          *
1077          * The intent is that i_disksize always represents the blocks which
1078          * are used by this file.  This allows recovery to restart truncate
1079          * on orphans if we crash during truncate.  We actually write i_disksize
1080          * into the on-disk inode when writing inodes out, instead of i_size.
1081          *
1082          * The only time when i_disksize and i_size may be different is when
1083          * a truncate is in progress.  The only things which change i_disksize
1084          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1085          */
1086         loff_t  i_disksize;
1087
1088         /*
1089          * i_data_sem is for serialising ext4_truncate() against
1090          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1091          * data tree are chopped off during truncate. We can't do that in
1092          * ext4 because whenever we perform intermediate commits during
1093          * truncate, the inode and all the metadata blocks *must* be in a
1094          * consistent state which allows truncation of the orphans to restart
1095          * during recovery.  Hence we must fix the get_block-vs-truncate race
1096          * by other means, so we have i_data_sem.
1097          */
1098         struct rw_semaphore i_data_sem;
1099         struct inode vfs_inode;
1100         struct jbd2_inode *jinode;
1101
1102         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1103
1104         /*
1105          * File creation time. Its function is same as that of
1106          * struct timespec64 i_{a,c,m}time in the generic inode.
1107          */
1108         struct timespec64 i_crtime;
1109
1110         /* mballoc */
1111         atomic_t i_prealloc_active;
1112         struct list_head i_prealloc_list;
1113         spinlock_t i_prealloc_lock;
1114
1115         /* extents status tree */
1116         struct ext4_es_tree i_es_tree;
1117         rwlock_t i_es_lock;
1118         struct list_head i_es_list;
1119         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1120         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1121         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1122                                            extents to shrink. Protected by
1123                                            i_es_lock  */
1124
1125         /* ialloc */
1126         ext4_group_t    i_last_alloc_group;
1127
1128         /* allocation reservation info for delalloc */
1129         /* In case of bigalloc, this refer to clusters rather than blocks */
1130         unsigned int i_reserved_data_blocks;
1131
1132         /* pending cluster reservations for bigalloc file systems */
1133         struct ext4_pending_tree i_pending_tree;
1134
1135         /* on-disk additional length */
1136         __u16 i_extra_isize;
1137
1138         /* Indicate the inline data space. */
1139         u16 i_inline_off;
1140         u16 i_inline_size;
1141
1142 #ifdef CONFIG_QUOTA
1143         /* quota space reservation, managed internally by quota code */
1144         qsize_t i_reserved_quota;
1145 #endif
1146
1147         /* Lock protecting lists below */
1148         spinlock_t i_completed_io_lock;
1149         /*
1150          * Completed IOs that need unwritten extents handling and have
1151          * transaction reserved
1152          */
1153         struct list_head i_rsv_conversion_list;
1154         struct work_struct i_rsv_conversion_work;
1155         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1156
1157         spinlock_t i_block_reservation_lock;
1158
1159         /*
1160          * Transactions that contain inode's metadata needed to complete
1161          * fsync and fdatasync, respectively.
1162          */
1163         tid_t i_sync_tid;
1164         tid_t i_datasync_tid;
1165
1166 #ifdef CONFIG_QUOTA
1167         struct dquot *i_dquot[MAXQUOTAS];
1168 #endif
1169
1170         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1171         __u32 i_csum_seed;
1172
1173         kprojid_t i_projid;
1174 };
1175
1176 /*
1177  * File system states
1178  */
1179 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1180 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1181 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1182 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1183
1184 /*
1185  * Misc. filesystem flags
1186  */
1187 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1188 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1189 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1190
1191 /*
1192  * Mount flags set via mount options or defaults
1193  */
1194 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1195 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1196 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1197 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1198 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1199 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1200 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1201 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1202 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1203 #ifdef CONFIG_FS_DAX
1204 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1205 #else
1206 #define EXT4_MOUNT_DAX_ALWAYS           0
1207 #endif
1208 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1209 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1210 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1211 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1212 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1213 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1214 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1215 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1216 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1217 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1218 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1219 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1220                                                  * enable enforcement for hidden
1221                                                  * quota files */
1222 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1223                                                   * enforcement for hidden quota
1224                                                   * files */
1225 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1226                                                   * enforcement */
1227 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1228 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1229 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1230 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1231 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1232 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1233 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1234 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1235 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1236 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1237
1238 /*
1239  * Mount flags set either automatically (could not be set by mount option)
1240  * based on per file system feature or property or in special cases such as
1241  * distinguishing between explicit mount option definition and default.
1242  */
1243 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1244                                                       specified delalloc */
1245 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1246                                                       size of blocksize * 8
1247                                                       blocks */
1248 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1249                                                       file systems */
1250 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1251                                                 specified journal checksum */
1252
1253 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1254 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1255 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1256 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN    0x00000080 /* Optimize group
1257                                                     * scanning in mballoc
1258                                                     */
1259
1260 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1261                                                 ~EXT4_MOUNT_##opt
1262 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1263                                                 EXT4_MOUNT_##opt
1264 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1265                                          EXT4_MOUNT_##opt)
1266
1267 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1268                                                 ~EXT4_MOUNT2_##opt
1269 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1270                                                 EXT4_MOUNT2_##opt
1271 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1272                                          EXT4_MOUNT2_##opt)
1273
1274 #define ext4_test_and_set_bit           __test_and_set_bit_le
1275 #define ext4_set_bit                    __set_bit_le
1276 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1277 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1278 #define ext4_clear_bit                  __clear_bit_le
1279 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1280 #define ext4_test_bit                   test_bit_le
1281 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1282 #define ext4_find_next_bit              find_next_bit_le
1283
1284 extern void mb_set_bits(void *bm, int cur, int len);
1285
1286 /*
1287  * Maximal mount counts between two filesystem checks
1288  */
1289 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1290 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1291
1292 /*
1293  * Behaviour when detecting errors
1294  */
1295 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1296 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1297 #define EXT4_ERRORS_PANIC               3       /* Panic */
1298 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1299
1300 /* Metadata checksum algorithm codes */
1301 #define EXT4_CRC32C_CHKSUM              1
1302
1303 #define EXT4_LABEL_MAX                  16
1304
1305 /*
1306  * Structure of the super block
1307  */
1308 struct ext4_super_block {
1309 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1310         __le32  s_blocks_count_lo;      /* Blocks count */
1311         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1312         __le32  s_free_blocks_count_lo; /* Free blocks count */
1313 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1314         __le32  s_first_data_block;     /* First Data Block */
1315         __le32  s_log_block_size;       /* Block size */
1316         __le32  s_log_cluster_size;     /* Allocation cluster size */
1317 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1318         __le32  s_clusters_per_group;   /* # Clusters per group */
1319         __le32  s_inodes_per_group;     /* # Inodes per group */
1320         __le32  s_mtime;                /* Mount time */
1321 /*30*/  __le32  s_wtime;                /* Write time */
1322         __le16  s_mnt_count;            /* Mount count */
1323         __le16  s_max_mnt_count;        /* Maximal mount count */
1324         __le16  s_magic;                /* Magic signature */
1325         __le16  s_state;                /* File system state */
1326         __le16  s_errors;               /* Behaviour when detecting errors */
1327         __le16  s_minor_rev_level;      /* minor revision level */
1328 /*40*/  __le32  s_lastcheck;            /* time of last check */
1329         __le32  s_checkinterval;        /* max. time between checks */
1330         __le32  s_creator_os;           /* OS */
1331         __le32  s_rev_level;            /* Revision level */
1332 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1333         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1334         /*
1335          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1336          *
1337          * Note: the difference between the compatible feature set and
1338          * the incompatible feature set is that if there is a bit set
1339          * in the incompatible feature set that the kernel doesn't
1340          * know about, it should refuse to mount the filesystem.
1341          *
1342          * e2fsck's requirements are more strict; if it doesn't know
1343          * about a feature in either the compatible or incompatible
1344          * feature set, it must abort and not try to meddle with
1345          * things it doesn't understand...
1346          */
1347         __le32  s_first_ino;            /* First non-reserved inode */
1348         __le16  s_inode_size;           /* size of inode structure */
1349         __le16  s_block_group_nr;       /* block group # of this superblock */
1350         __le32  s_feature_compat;       /* compatible feature set */
1351 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1352         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1353 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1354 /*78*/  char    s_volume_name[EXT4_LABEL_MAX];  /* volume name */
1355 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1356 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1357         /*
1358          * Performance hints.  Directory preallocation should only
1359          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1360          */
1361         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1362         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1363         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1364         /*
1365          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1366          */
1367 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1368 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1369         __le32  s_journal_dev;          /* device number of journal file */
1370         __le32  s_last_orphan;          /* start of list of inodes to delete */
1371         __le32  s_hash_seed[4];         /* HTREE hash seed */
1372         __u8    s_def_hash_version;     /* Default hash version to use */
1373         __u8    s_jnl_backup_type;
1374         __le16  s_desc_size;            /* size of group descriptor */
1375 /*100*/ __le32  s_default_mount_opts;
1376         __le32  s_first_meta_bg;        /* First metablock block group */
1377         __le32  s_mkfs_time;            /* When the filesystem was created */
1378         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1379         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1380 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1381         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1382         __le32  s_free_blocks_count_hi; /* Free blocks count */
1383         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1384         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1385         __le32  s_flags;                /* Miscellaneous flags */
1386         __le16  s_raid_stride;          /* RAID stride */
1387         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1388         __le64  s_mmp_block;            /* Block for multi-mount protection */
1389         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1390         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1391         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1392         __u8    s_encryption_level;     /* versioning level for encryption */
1393         __u8    s_reserved_pad;         /* Padding to next 32bits */
1394         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1395         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1396         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1397         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1398                                               snapshot's future use */
1399         __le32  s_snapshot_list;        /* inode number of the head of the
1400                                            on-disk snapshot list */
1401 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1402         __le32  s_error_count;          /* number of fs errors */
1403         __le32  s_first_error_time;     /* first time an error happened */
1404         __le32  s_first_error_ino;      /* inode involved in first error */
1405         __le64  s_first_error_block;    /* block involved of first error */
1406         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1407         __le32  s_first_error_line;     /* line number where error happened */
1408         __le32  s_last_error_time;      /* most recent time of an error */
1409         __le32  s_last_error_ino;       /* inode involved in last error */
1410         __le32  s_last_error_line;      /* line number where error happened */
1411         __le64  s_last_error_block;     /* block involved of last error */
1412         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1413 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1414         __u8    s_mount_opts[64];
1415         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1416         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1417         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1418         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1419         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1420         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1421         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1422         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1423         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1424         __u8    s_wtime_hi;
1425         __u8    s_mtime_hi;
1426         __u8    s_mkfs_time_hi;
1427         __u8    s_lastcheck_hi;
1428         __u8    s_first_error_time_hi;
1429         __u8    s_last_error_time_hi;
1430         __u8    s_first_error_errcode;
1431         __u8    s_last_error_errcode;
1432         __le16  s_encoding;             /* Filename charset encoding */
1433         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1434         __le32  s_orphan_file_inum;     /* Inode for tracking orphan inodes */
1435         __le32  s_reserved[94];         /* Padding to the end of the block */
1436         __le32  s_checksum;             /* crc32c(superblock) */
1437 };
1438
1439 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1440
1441 #ifdef __KERNEL__
1442
1443 #ifdef CONFIG_FS_ENCRYPTION
1444 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1445 #else
1446 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1447 #endif
1448
1449 /* Number of quota types we support */
1450 #define EXT4_MAXQUOTAS 3
1451
1452 #define EXT4_ENC_UTF8_12_1      1
1453
1454 /* Types of ext4 journal triggers */
1455 enum ext4_journal_trigger_type {
1456         EXT4_JTR_ORPHAN_FILE,
1457         EXT4_JTR_NONE   /* This must be the last entry for indexing to work! */
1458 };
1459
1460 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1461
1462 struct ext4_journal_trigger {
1463         struct jbd2_buffer_trigger_type tr_triggers;
1464         struct super_block *sb;
1465 };
1466
1467 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1468                                 struct jbd2_buffer_trigger_type *trigger)
1469 {
1470         return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1471 }
1472
1473 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1474
1475 /* Structure at the tail of orphan block */
1476 struct ext4_orphan_block_tail {
1477         __le32 ob_magic;
1478         __le32 ob_checksum;
1479 };
1480
1481 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1482 {
1483         return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1484                         sizeof(u32);
1485 }
1486
1487 struct ext4_orphan_block {
1488         atomic_t ob_free_entries;       /* Number of free orphan entries in block */
1489         struct buffer_head *ob_bh;      /* Buffer for orphan block */
1490 };
1491
1492 /*
1493  * Info about orphan file.
1494  */
1495 struct ext4_orphan_info {
1496         int of_blocks;                  /* Number of orphan blocks in a file */
1497         __u32 of_csum_seed;             /* Checksum seed for orphan file */
1498         struct ext4_orphan_block *of_binfo;     /* Array with info about orphan
1499                                                  * file blocks */
1500 };
1501
1502 /*
1503  * fourth extended-fs super-block data in memory
1504  */
1505 struct ext4_sb_info {
1506         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1507         unsigned long s_inodes_per_block;/* Number of inodes per block */
1508         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1509         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1510         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1511         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1512         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1513         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1514         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1515         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1516         unsigned long s_overhead;  /* # of fs overhead clusters */
1517         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1518         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1519         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1520         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1521         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1522         struct buffer_head * __rcu *s_group_desc;
1523         unsigned int s_mount_opt;
1524         unsigned int s_mount_opt2;
1525         unsigned long s_mount_flags;
1526         unsigned int s_def_mount_opt;
1527         ext4_fsblk_t s_sb_block;
1528         atomic64_t s_resv_clusters;
1529         kuid_t s_resuid;
1530         kgid_t s_resgid;
1531         unsigned short s_mount_state;
1532         unsigned short s_pad;
1533         int s_addr_per_block_bits;
1534         int s_desc_per_block_bits;
1535         int s_inode_size;
1536         int s_first_ino;
1537         unsigned int s_inode_readahead_blks;
1538         unsigned int s_inode_goal;
1539         u32 s_hash_seed[4];
1540         int s_def_hash_version;
1541         int s_hash_unsigned;    /* 3 if hash should be unsigned, 0 if not */
1542         struct percpu_counter s_freeclusters_counter;
1543         struct percpu_counter s_freeinodes_counter;
1544         struct percpu_counter s_dirs_counter;
1545         struct percpu_counter s_dirtyclusters_counter;
1546         struct percpu_counter s_sra_exceeded_retry_limit;
1547         struct blockgroup_lock *s_blockgroup_lock;
1548         struct proc_dir_entry *s_proc;
1549         struct kobject s_kobj;
1550         struct completion s_kobj_unregister;
1551         struct super_block *s_sb;
1552         struct buffer_head *s_mmp_bh;
1553
1554         /* Journaling */
1555         struct journal_s *s_journal;
1556         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1557         struct mutex s_orphan_lock;     /* Protects on disk list changes */
1558         struct list_head s_orphan;      /* List of orphaned inodes in on disk
1559                                            list */
1560         struct ext4_orphan_info s_orphan_info;
1561         unsigned long s_commit_interval;
1562         u32 s_max_batch_time;
1563         u32 s_min_batch_time;
1564         struct block_device *s_journal_bdev;
1565 #ifdef CONFIG_QUOTA
1566         /* Names of quota files with journalled quota */
1567         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1568         int s_jquota_fmt;                       /* Format of quota to use */
1569 #endif
1570         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1571         struct ext4_system_blocks __rcu *s_system_blks;
1572
1573 #ifdef EXTENTS_STATS
1574         /* ext4 extents stats */
1575         unsigned long s_ext_min;
1576         unsigned long s_ext_max;
1577         unsigned long s_depth_max;
1578         spinlock_t s_ext_stats_lock;
1579         unsigned long s_ext_blocks;
1580         unsigned long s_ext_extents;
1581 #endif
1582
1583         /* for buddy allocator */
1584         struct ext4_group_info ** __rcu *s_group_info;
1585         struct inode *s_buddy_cache;
1586         spinlock_t s_md_lock;
1587         unsigned short *s_mb_offsets;
1588         unsigned int *s_mb_maxs;
1589         unsigned int s_group_info_size;
1590         unsigned int s_mb_free_pending;
1591         struct list_head s_freed_data_list;     /* List of blocks to be freed
1592                                                    after commit completed */
1593         struct list_head s_discard_list;
1594         struct work_struct s_discard_work;
1595         atomic_t s_retry_alloc_pending;
1596         struct rb_root s_mb_avg_fragment_size_root;
1597         rwlock_t s_mb_rb_lock;
1598         struct list_head *s_mb_largest_free_orders;
1599         rwlock_t *s_mb_largest_free_orders_locks;
1600
1601         /* tunables */
1602         unsigned long s_stripe;
1603         unsigned int s_mb_max_linear_groups;
1604         unsigned int s_mb_stream_request;
1605         unsigned int s_mb_max_to_scan;
1606         unsigned int s_mb_min_to_scan;
1607         unsigned int s_mb_stats;
1608         unsigned int s_mb_order2_reqs;
1609         unsigned int s_mb_group_prealloc;
1610         unsigned int s_mb_max_inode_prealloc;
1611         unsigned int s_max_dir_size_kb;
1612         /* where last allocation was done - for stream allocation */
1613         unsigned long s_mb_last_group;
1614         unsigned long s_mb_last_start;
1615         unsigned int s_mb_prefetch;
1616         unsigned int s_mb_prefetch_limit;
1617
1618         /* stats for buddy allocator */
1619         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1620         atomic_t s_bal_success; /* we found long enough chunks */
1621         atomic_t s_bal_allocated;       /* in blocks */
1622         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1623         atomic_t s_bal_groups_scanned;  /* number of groups scanned */
1624         atomic_t s_bal_goals;   /* goal hits */
1625         atomic_t s_bal_breaks;  /* too long searches */
1626         atomic_t s_bal_2orders; /* 2^order hits */
1627         atomic_t s_bal_cr0_bad_suggestions;
1628         atomic_t s_bal_cr1_bad_suggestions;
1629         atomic64_t s_bal_cX_groups_considered[4];
1630         atomic64_t s_bal_cX_hits[4];
1631         atomic64_t s_bal_cX_failed[4];          /* cX loop didn't find blocks */
1632         atomic_t s_mb_buddies_generated;        /* number of buddies generated */
1633         atomic64_t s_mb_generation_time;
1634         atomic_t s_mb_lost_chunks;
1635         atomic_t s_mb_preallocated;
1636         atomic_t s_mb_discarded;
1637         atomic_t s_lock_busy;
1638
1639         /* locality groups */
1640         struct ext4_locality_group __percpu *s_locality_groups;
1641
1642         /* for write statistics */
1643         unsigned long s_sectors_written_start;
1644         u64 s_kbytes_written;
1645
1646         /* the size of zero-out chunk */
1647         unsigned int s_extent_max_zeroout_kb;
1648
1649         unsigned int s_log_groups_per_flex;
1650         struct flex_groups * __rcu *s_flex_groups;
1651         ext4_group_t s_flex_groups_allocated;
1652
1653         /* workqueue for reserved extent conversions (buffered io) */
1654         struct workqueue_struct *rsv_conversion_wq;
1655
1656         /* timer for periodic error stats printing */
1657         struct timer_list s_err_report;
1658
1659         /* Lazy inode table initialization info */
1660         struct ext4_li_request *s_li_request;
1661         /* Wait multiplier for lazy initialization thread */
1662         unsigned int s_li_wait_mult;
1663
1664         /* Kernel thread for multiple mount protection */
1665         struct task_struct *s_mmp_tsk;
1666
1667         /* record the last minlen when FITRIM is called. */
1668         unsigned long s_last_trim_minblks;
1669
1670         /* Reference to checksum algorithm driver via cryptoapi */
1671         struct crypto_shash *s_chksum_driver;
1672
1673         /* Precomputed FS UUID checksum for seeding other checksums */
1674         __u32 s_csum_seed;
1675
1676         /* Reclaim extents from extent status tree */
1677         struct shrinker s_es_shrinker;
1678         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1679         long s_es_nr_inode;
1680         struct ext4_es_stats s_es_stats;
1681         struct mb_cache *s_ea_block_cache;
1682         struct mb_cache *s_ea_inode_cache;
1683         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1684
1685         /* Journal triggers for checksum computation */
1686         struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1687
1688         /* Ratelimit ext4 messages. */
1689         struct ratelimit_state s_err_ratelimit_state;
1690         struct ratelimit_state s_warning_ratelimit_state;
1691         struct ratelimit_state s_msg_ratelimit_state;
1692         atomic_t s_warning_count;
1693         atomic_t s_msg_count;
1694
1695         /* Encryption policy for '-o test_dummy_encryption' */
1696         struct fscrypt_dummy_policy s_dummy_enc_policy;
1697
1698         /*
1699          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1700          * or EXTENTS flag.
1701          */
1702         struct percpu_rw_semaphore s_writepages_rwsem;
1703         struct dax_device *s_daxdev;
1704         u64 s_dax_part_off;
1705 #ifdef CONFIG_EXT4_DEBUG
1706         unsigned long s_simulate_fail;
1707 #endif
1708         /* Record the errseq of the backing block device */
1709         errseq_t s_bdev_wb_err;
1710         spinlock_t s_bdev_wb_lock;
1711
1712         /* Information about errors that happened during this mount */
1713         spinlock_t s_error_lock;
1714         int s_add_error_count;
1715         int s_first_error_code;
1716         __u32 s_first_error_line;
1717         __u32 s_first_error_ino;
1718         __u64 s_first_error_block;
1719         const char *s_first_error_func;
1720         time64_t s_first_error_time;
1721         int s_last_error_code;
1722         __u32 s_last_error_line;
1723         __u32 s_last_error_ino;
1724         __u64 s_last_error_block;
1725         const char *s_last_error_func;
1726         time64_t s_last_error_time;
1727         /*
1728          * If we are in a context where we cannot update error information in
1729          * the on-disk superblock, we queue this work to do it.
1730          */
1731         struct work_struct s_error_work;
1732
1733         /* Ext4 fast commit sub transaction ID */
1734         atomic_t s_fc_subtid;
1735
1736         /*
1737          * After commit starts, the main queue gets locked, and the further
1738          * updates get added in the staging queue.
1739          */
1740 #define FC_Q_MAIN       0
1741 #define FC_Q_STAGING    1
1742         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1743                                          * that have data changes in them.
1744                                          */
1745         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1746         unsigned int s_fc_bytes;
1747         /*
1748          * Main fast commit lock. This lock protects accesses to the
1749          * following fields:
1750          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1751          */
1752         spinlock_t s_fc_lock;
1753         struct buffer_head *s_fc_bh;
1754         struct ext4_fc_stats s_fc_stats;
1755         tid_t s_fc_ineligible_tid;
1756 #ifdef CONFIG_EXT4_DEBUG
1757         int s_fc_debug_max_replay;
1758 #endif
1759         struct ext4_fc_replay_state s_fc_replay_state;
1760 };
1761
1762 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1763 {
1764         return sb->s_fs_info;
1765 }
1766 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1767 {
1768         return container_of(inode, struct ext4_inode_info, vfs_inode);
1769 }
1770
1771 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1772 {
1773         return ino == EXT4_ROOT_INO ||
1774                 (ino >= EXT4_FIRST_INO(sb) &&
1775                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1776 }
1777
1778 /*
1779  * Returns: sbi->field[index]
1780  * Used to access an array element from the following sbi fields which require
1781  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1782  * - s_group_desc
1783  * - s_group_info
1784  * - s_flex_group
1785  */
1786 #define sbi_array_rcu_deref(sbi, field, index)                             \
1787 ({                                                                         \
1788         typeof(*((sbi)->field)) _v;                                        \
1789         rcu_read_lock();                                                   \
1790         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1791         rcu_read_unlock();                                                 \
1792         _v;                                                                \
1793 })
1794
1795 /*
1796  * run-time mount flags
1797  */
1798 enum {
1799         EXT4_MF_MNTDIR_SAMPLED,
1800         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1801         EXT4_MF_FC_INELIGIBLE   /* Fast commit ineligible */
1802 };
1803
1804 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1805 {
1806         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1807 }
1808
1809 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1810 {
1811         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1812 }
1813
1814 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1815 {
1816         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1817 }
1818
1819
1820 /*
1821  * Simulate_fail codes
1822  */
1823 #define EXT4_SIM_BBITMAP_EIO    1
1824 #define EXT4_SIM_BBITMAP_CRC    2
1825 #define EXT4_SIM_IBITMAP_EIO    3
1826 #define EXT4_SIM_IBITMAP_CRC    4
1827 #define EXT4_SIM_INODE_EIO      5
1828 #define EXT4_SIM_INODE_CRC      6
1829 #define EXT4_SIM_DIRBLOCK_EIO   7
1830 #define EXT4_SIM_DIRBLOCK_CRC   8
1831
1832 static inline bool ext4_simulate_fail(struct super_block *sb,
1833                                      unsigned long code)
1834 {
1835 #ifdef CONFIG_EXT4_DEBUG
1836         struct ext4_sb_info *sbi = EXT4_SB(sb);
1837
1838         if (unlikely(sbi->s_simulate_fail == code)) {
1839                 sbi->s_simulate_fail = 0;
1840                 return true;
1841         }
1842 #endif
1843         return false;
1844 }
1845
1846 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1847                                          struct buffer_head *bh,
1848                                          unsigned long code)
1849 {
1850         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1851                 clear_buffer_uptodate(bh);
1852 }
1853
1854 /*
1855  * Error number codes for s_{first,last}_error_errno
1856  *
1857  * Linux errno numbers are architecture specific, so we need to translate
1858  * them into something which is architecture independent.   We don't define
1859  * codes for all errno's; just the ones which are most likely to be the cause
1860  * of an ext4_error() call.
1861  */
1862 #define EXT4_ERR_UNKNOWN         1
1863 #define EXT4_ERR_EIO             2
1864 #define EXT4_ERR_ENOMEM          3
1865 #define EXT4_ERR_EFSBADCRC       4
1866 #define EXT4_ERR_EFSCORRUPTED    5
1867 #define EXT4_ERR_ENOSPC          6
1868 #define EXT4_ERR_ENOKEY          7
1869 #define EXT4_ERR_EROFS           8
1870 #define EXT4_ERR_EFBIG           9
1871 #define EXT4_ERR_EEXIST         10
1872 #define EXT4_ERR_ERANGE         11
1873 #define EXT4_ERR_EOVERFLOW      12
1874 #define EXT4_ERR_EBUSY          13
1875 #define EXT4_ERR_ENOTDIR        14
1876 #define EXT4_ERR_ENOTEMPTY      15
1877 #define EXT4_ERR_ESHUTDOWN      16
1878 #define EXT4_ERR_EFAULT         17
1879
1880 /*
1881  * Inode dynamic state flags
1882  */
1883 enum {
1884         EXT4_STATE_JDATA,               /* journaled data exists */
1885         EXT4_STATE_NEW,                 /* inode is newly created */
1886         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1887         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1888         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1889         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1890         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1891         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1892         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1893         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1894         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1895         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1896         EXT4_STATE_ORPHAN_FILE,         /* Inode orphaned in orphan file */
1897 };
1898
1899 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1900 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1901 {                                                                       \
1902         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1903 }                                                                       \
1904 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1905 {                                                                       \
1906         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1907 }                                                                       \
1908 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1909 {                                                                       \
1910         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1911 }
1912
1913 /* Add these declarations here only so that these functions can be
1914  * found by name.  Otherwise, they are very hard to locate. */
1915 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1916 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1917 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1918 EXT4_INODE_BIT_FNS(flag, flags, 0)
1919
1920 /* Add these declarations here only so that these functions can be
1921  * found by name.  Otherwise, they are very hard to locate. */
1922 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1923 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1924 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1925 #if (BITS_PER_LONG < 64)
1926 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1927
1928 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1929 {
1930         (ei)->i_state_flags = 0;
1931 }
1932 #else
1933 EXT4_INODE_BIT_FNS(state, flags, 32)
1934
1935 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1936 {
1937         /* We depend on the fact that callers will set i_flags */
1938 }
1939 #endif
1940 #else
1941 /* Assume that user mode programs are passing in an ext4fs superblock, not
1942  * a kernel struct super_block.  This will allow us to call the feature-test
1943  * macros from user land. */
1944 #define EXT4_SB(sb)     (sb)
1945 #endif
1946
1947 static inline bool ext4_verity_in_progress(struct inode *inode)
1948 {
1949         return IS_ENABLED(CONFIG_FS_VERITY) &&
1950                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1951 }
1952
1953 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1954
1955 /*
1956  * Codes for operating systems
1957  */
1958 #define EXT4_OS_LINUX           0
1959 #define EXT4_OS_HURD            1
1960 #define EXT4_OS_MASIX           2
1961 #define EXT4_OS_FREEBSD         3
1962 #define EXT4_OS_LITES           4
1963
1964 /*
1965  * Revision levels
1966  */
1967 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1968 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1969
1970 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1971
1972 #define EXT4_GOOD_OLD_INODE_SIZE 128
1973
1974 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1975 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1976 #define EXT4_TIMESTAMP_MIN              S32_MIN
1977
1978 /*
1979  * Feature set definitions
1980  */
1981
1982 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1983 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1984 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1985 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1986 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1987 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1988 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1989 /*
1990  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1991  * incompatible only if fast commit blocks are present in the FS. Since we
1992  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1993  * incompatible. We also have a JBD2 incompat feature, which gets set when
1994  * there are fast commit blocks present in the journal.
1995  */
1996 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
1997 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1998 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE         0x1000  /* Orphan file exists */
1999
2000 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
2001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
2002 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
2003 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2004 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
2005 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
2006 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
2007 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
2008 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
2009 /*
2010  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2011  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2012  * all other data structures' checksums.  However, the METADATA_CSUM and
2013  * GDT_CSUM bits are mutually exclusive.
2014  */
2015 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
2016 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
2017 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
2018 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
2019 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT   0x10000 /* Orphan file may be
2020                                                            non-empty */
2021
2022 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
2023 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
2024 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
2025 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
2026 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
2027 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
2028 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
2029 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2030 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
2031 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
2032 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
2033 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
2034 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
2035 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
2036 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
2037 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
2038
2039 extern void ext4_update_dynamic_rev(struct super_block *sb);
2040
2041 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2042 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2043 { \
2044         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2045                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2046 } \
2047 static inline void ext4_set_feature_##name(struct super_block *sb) \
2048 { \
2049         ext4_update_dynamic_rev(sb); \
2050         EXT4_SB(sb)->s_es->s_feature_compat |= \
2051                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2052 } \
2053 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2054 { \
2055         EXT4_SB(sb)->s_es->s_feature_compat &= \
2056                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057 }
2058
2059 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2060 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2061 { \
2062         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2063                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2064 } \
2065 static inline void ext4_set_feature_##name(struct super_block *sb) \
2066 { \
2067         ext4_update_dynamic_rev(sb); \
2068         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2069                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2070 } \
2071 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2072 { \
2073         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2074                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075 }
2076
2077 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2078 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2079 { \
2080         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2081                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2082 } \
2083 static inline void ext4_set_feature_##name(struct super_block *sb) \
2084 { \
2085         ext4_update_dynamic_rev(sb); \
2086         EXT4_SB(sb)->s_es->s_feature_incompat |= \
2087                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2088 } \
2089 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2090 { \
2091         EXT4_SB(sb)->s_es->s_feature_incompat &= \
2092                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093 }
2094
2095 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
2096 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
2097 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
2098 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
2099 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
2100 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
2101 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
2102 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
2103 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
2104 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,          ORPHAN_FILE)
2105
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
2117 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
2118 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
2119 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,    ORPHAN_PRESENT)
2120
2121 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
2134 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2135 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2136 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2137
2138 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2139 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2140                                          EXT4_FEATURE_INCOMPAT_META_BG)
2141 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2142                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2143                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2144
2145 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2146 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2147                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2148                                          EXT4_FEATURE_INCOMPAT_META_BG)
2149 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2150                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2151                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2152
2153 #define EXT4_FEATURE_COMPAT_SUPP        (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2154                                          EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2155 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2156                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2157                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2158                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2159                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2160                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2161                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2162                                          EXT4_FEATURE_INCOMPAT_MMP | \
2163                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2164                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2165                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2166                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2167                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2168 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2169                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2170                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2171                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2172                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2173                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2174                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2175                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2176                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2177                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2178                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2179                                          EXT4_FEATURE_RO_COMPAT_VERITY |\
2180                                          EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2181
2182 #define EXTN_FEATURE_FUNCS(ver) \
2183 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2184 { \
2185         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2186                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2187 } \
2188 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2189 { \
2190         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2191                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2192 } \
2193 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2194 { \
2195         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2196                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2197 }
2198
2199 EXTN_FEATURE_FUNCS(2)
2200 EXTN_FEATURE_FUNCS(3)
2201 EXTN_FEATURE_FUNCS(4)
2202
2203 static inline bool ext4_has_compat_features(struct super_block *sb)
2204 {
2205         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2206 }
2207 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2208 {
2209         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2210 }
2211 static inline bool ext4_has_incompat_features(struct super_block *sb)
2212 {
2213         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2214 }
2215
2216 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2217
2218 /*
2219  * Superblock flags
2220  */
2221 #define EXT4_FLAGS_RESIZING     0
2222 #define EXT4_FLAGS_SHUTDOWN     1
2223 #define EXT4_FLAGS_BDEV_IS_DAX  2
2224
2225 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2226 {
2227         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2228 }
2229
2230 /*
2231  * Default values for user and/or group using reserved blocks
2232  */
2233 #define EXT4_DEF_RESUID         0
2234 #define EXT4_DEF_RESGID         0
2235
2236 /*
2237  * Default project ID
2238  */
2239 #define EXT4_DEF_PROJID         0
2240
2241 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2242
2243 /*
2244  * Default mount options
2245  */
2246 #define EXT4_DEFM_DEBUG         0x0001
2247 #define EXT4_DEFM_BSDGROUPS     0x0002
2248 #define EXT4_DEFM_XATTR_USER    0x0004
2249 #define EXT4_DEFM_ACL           0x0008
2250 #define EXT4_DEFM_UID16         0x0010
2251 #define EXT4_DEFM_JMODE         0x0060
2252 #define EXT4_DEFM_JMODE_DATA    0x0020
2253 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2254 #define EXT4_DEFM_JMODE_WBACK   0x0060
2255 #define EXT4_DEFM_NOBARRIER     0x0100
2256 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2257 #define EXT4_DEFM_DISCARD       0x0400
2258 #define EXT4_DEFM_NODELALLOC    0x0800
2259
2260 /*
2261  * Default journal batch times
2262  */
2263 #define EXT4_DEF_MIN_BATCH_TIME 0
2264 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2265
2266 /*
2267  * Minimum number of groups in a flexgroup before we separate out
2268  * directories into the first block group of a flexgroup
2269  */
2270 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2271
2272 /*
2273  * Structure of a directory entry
2274  */
2275 #define EXT4_NAME_LEN 255
2276
2277 struct ext4_dir_entry {
2278         __le32  inode;                  /* Inode number */
2279         __le16  rec_len;                /* Directory entry length */
2280         __le16  name_len;               /* Name length */
2281         char    name[EXT4_NAME_LEN];    /* File name */
2282 };
2283
2284
2285 /*
2286  * Encrypted Casefolded entries require saving the hash on disk. This structure
2287  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2288  * boundary.
2289  */
2290 struct ext4_dir_entry_hash {
2291         __le32 hash;
2292         __le32 minor_hash;
2293 };
2294
2295 /*
2296  * The new version of the directory entry.  Since EXT4 structures are
2297  * stored in intel byte order, and the name_len field could never be
2298  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2299  * file_type field.
2300  */
2301 struct ext4_dir_entry_2 {
2302         __le32  inode;                  /* Inode number */
2303         __le16  rec_len;                /* Directory entry length */
2304         __u8    name_len;               /* Name length */
2305         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2306         char    name[EXT4_NAME_LEN];    /* File name */
2307 };
2308
2309 /*
2310  * Access the hashes at the end of ext4_dir_entry_2
2311  */
2312 #define EXT4_DIRENT_HASHES(entry) \
2313         ((struct ext4_dir_entry_hash *) \
2314                 (((void *)(entry)) + \
2315                 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2316 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2317 #define EXT4_DIRENT_MINOR_HASH(entry) \
2318                 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2319
2320 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2321 {
2322         return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2323 }
2324
2325 /*
2326  * This is a bogus directory entry at the end of each leaf block that
2327  * records checksums.
2328  */
2329 struct ext4_dir_entry_tail {
2330         __le32  det_reserved_zero1;     /* Pretend to be unused */
2331         __le16  det_rec_len;            /* 12 */
2332         __u8    det_reserved_zero2;     /* Zero name length */
2333         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2334         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2335 };
2336
2337 #define EXT4_DIRENT_TAIL(block, blocksize) \
2338         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2339                                         ((blocksize) - \
2340                                          sizeof(struct ext4_dir_entry_tail))))
2341
2342 /*
2343  * Ext4 directory file types.  Only the low 3 bits are used.  The
2344  * other bits are reserved for now.
2345  */
2346 #define EXT4_FT_UNKNOWN         0
2347 #define EXT4_FT_REG_FILE        1
2348 #define EXT4_FT_DIR             2
2349 #define EXT4_FT_CHRDEV          3
2350 #define EXT4_FT_BLKDEV          4
2351 #define EXT4_FT_FIFO            5
2352 #define EXT4_FT_SOCK            6
2353 #define EXT4_FT_SYMLINK         7
2354
2355 #define EXT4_FT_MAX             8
2356
2357 #define EXT4_FT_DIR_CSUM        0xDE
2358
2359 /*
2360  * EXT4_DIR_PAD defines the directory entries boundaries
2361  *
2362  * NOTE: It must be a multiple of 4
2363  */
2364 #define EXT4_DIR_PAD                    4
2365 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2366 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2367
2368 /*
2369  * The rec_len is dependent on the type of directory. Directories that are
2370  * casefolded and encrypted need to store the hash as well, so we add room for
2371  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2372  * pass NULL for dir, as those entries do not use the extra fields.
2373  */
2374 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2375                                                 const struct inode *dir)
2376 {
2377         int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2378
2379         if (dir && ext4_hash_in_dirent(dir))
2380                 rec_len += sizeof(struct ext4_dir_entry_hash);
2381         return (rec_len & ~EXT4_DIR_ROUND);
2382 }
2383
2384 /*
2385  * If we ever get support for fs block sizes > page_size, we'll need
2386  * to remove the #if statements in the next two functions...
2387  */
2388 static inline unsigned int
2389 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2390 {
2391         unsigned len = le16_to_cpu(dlen);
2392
2393 #if (PAGE_SIZE >= 65536)
2394         if (len == EXT4_MAX_REC_LEN || len == 0)
2395                 return blocksize;
2396         return (len & 65532) | ((len & 3) << 16);
2397 #else
2398         return len;
2399 #endif
2400 }
2401
2402 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2403 {
2404         BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2405 #if (PAGE_SIZE >= 65536)
2406         if (len < 65536)
2407                 return cpu_to_le16(len);
2408         if (len == blocksize) {
2409                 if (blocksize == 65536)
2410                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2411                 else
2412                         return cpu_to_le16(0);
2413         }
2414         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2415 #else
2416         return cpu_to_le16(len);
2417 #endif
2418 }
2419
2420 /*
2421  * Hash Tree Directory indexing
2422  * (c) Daniel Phillips, 2001
2423  */
2424
2425 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2426                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2427 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2428                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2429 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2430
2431 /* Legal values for the dx_root hash_version field: */
2432
2433 #define DX_HASH_LEGACY                  0
2434 #define DX_HASH_HALF_MD4                1
2435 #define DX_HASH_TEA                     2
2436 #define DX_HASH_LEGACY_UNSIGNED         3
2437 #define DX_HASH_HALF_MD4_UNSIGNED       4
2438 #define DX_HASH_TEA_UNSIGNED            5
2439 #define DX_HASH_SIPHASH                 6
2440
2441 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2442                               const void *address, unsigned int length)
2443 {
2444         struct {
2445                 struct shash_desc shash;
2446                 char ctx[4];
2447         } desc;
2448
2449         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2450
2451         desc.shash.tfm = sbi->s_chksum_driver;
2452         *(u32 *)desc.ctx = crc;
2453
2454         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2455
2456         return *(u32 *)desc.ctx;
2457 }
2458
2459 #ifdef __KERNEL__
2460
2461 /* hash info structure used by the directory hash */
2462 struct dx_hash_info
2463 {
2464         u32             hash;
2465         u32             minor_hash;
2466         int             hash_version;
2467         u32             *seed;
2468 };
2469
2470
2471 /* 32 and 64 bit signed EOF for dx directories */
2472 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2473 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2474
2475
2476 /*
2477  * Control parameters used by ext4_htree_next_block
2478  */
2479 #define HASH_NB_ALWAYS          1
2480
2481 struct ext4_filename {
2482         const struct qstr *usr_fname;
2483         struct fscrypt_str disk_name;
2484         struct dx_hash_info hinfo;
2485 #ifdef CONFIG_FS_ENCRYPTION
2486         struct fscrypt_str crypto_buf;
2487 #endif
2488 #if IS_ENABLED(CONFIG_UNICODE)
2489         struct fscrypt_str cf_name;
2490 #endif
2491 };
2492
2493 #define fname_name(p) ((p)->disk_name.name)
2494 #define fname_usr_name(p) ((p)->usr_fname->name)
2495 #define fname_len(p)  ((p)->disk_name.len)
2496
2497 /*
2498  * Describe an inode's exact location on disk and in memory
2499  */
2500 struct ext4_iloc
2501 {
2502         struct buffer_head *bh;
2503         unsigned long offset;
2504         ext4_group_t block_group;
2505 };
2506
2507 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2508 {
2509         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2510 }
2511
2512 static inline bool ext4_is_quota_file(struct inode *inode)
2513 {
2514         return IS_NOQUOTA(inode) &&
2515                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2516 }
2517
2518 /*
2519  * This structure is stuffed into the struct file's private_data field
2520  * for directories.  It is where we put information so that we can do
2521  * readdir operations in hash tree order.
2522  */
2523 struct dir_private_info {
2524         struct rb_root  root;
2525         struct rb_node  *curr_node;
2526         struct fname    *extra_fname;
2527         loff_t          last_pos;
2528         __u32           curr_hash;
2529         __u32           curr_minor_hash;
2530         __u32           next_hash;
2531 };
2532
2533 /* calculate the first block number of the group */
2534 static inline ext4_fsblk_t
2535 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2536 {
2537         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2538                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2539 }
2540
2541 /*
2542  * Special error return code only used by dx_probe() and its callers.
2543  */
2544 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2545
2546 /* htree levels for ext4 */
2547 #define EXT4_HTREE_LEVEL_COMPAT 2
2548 #define EXT4_HTREE_LEVEL        3
2549
2550 static inline int ext4_dir_htree_level(struct super_block *sb)
2551 {
2552         return ext4_has_feature_largedir(sb) ?
2553                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2554 }
2555
2556 /*
2557  * Timeout and state flag for lazy initialization inode thread.
2558  */
2559 #define EXT4_DEF_LI_WAIT_MULT                   10
2560 #define EXT4_DEF_LI_MAX_START_DELAY             5
2561 #define EXT4_LAZYINIT_QUIT                      0x0001
2562 #define EXT4_LAZYINIT_RUNNING                   0x0002
2563
2564 /*
2565  * Lazy inode table initialization info
2566  */
2567 struct ext4_lazy_init {
2568         unsigned long           li_state;
2569         struct list_head        li_request_list;
2570         struct mutex            li_list_mtx;
2571 };
2572
2573 enum ext4_li_mode {
2574         EXT4_LI_MODE_PREFETCH_BBITMAP,
2575         EXT4_LI_MODE_ITABLE,
2576 };
2577
2578 struct ext4_li_request {
2579         struct super_block      *lr_super;
2580         enum ext4_li_mode       lr_mode;
2581         ext4_group_t            lr_first_not_zeroed;
2582         ext4_group_t            lr_next_group;
2583         struct list_head        lr_request;
2584         unsigned long           lr_next_sched;
2585         unsigned long           lr_timeout;
2586 };
2587
2588 struct ext4_features {
2589         struct kobject f_kobj;
2590         struct completion f_kobj_unregister;
2591 };
2592
2593 /*
2594  * This structure will be used for multiple mount protection. It will be
2595  * written into the block number saved in the s_mmp_block field in the
2596  * superblock. Programs that check MMP should assume that if
2597  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2598  * to use the filesystem, regardless of how old the timestamp is.
2599  */
2600 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2601 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2602 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2603 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2604
2605 struct mmp_struct {
2606         __le32  mmp_magic;              /* Magic number for MMP */
2607         __le32  mmp_seq;                /* Sequence no. updated periodically */
2608
2609         /*
2610          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2611          * purposes and do not affect the correctness of the algorithm
2612          */
2613         __le64  mmp_time;               /* Time last updated */
2614         char    mmp_nodename[64];       /* Node which last updated MMP block */
2615         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2616
2617         /*
2618          * mmp_check_interval is used to verify if the MMP block has been
2619          * updated on the block device. The value is updated based on the
2620          * maximum time to write the MMP block during an update cycle.
2621          */
2622         __le16  mmp_check_interval;
2623
2624         __le16  mmp_pad1;
2625         __le32  mmp_pad2[226];
2626         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2627 };
2628
2629 /* arguments passed to the mmp thread */
2630 struct mmpd_data {
2631         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2632         struct super_block *sb;  /* super block of the fs */
2633 };
2634
2635 /*
2636  * Check interval multiplier
2637  * The MMP block is written every update interval and initially checked every
2638  * update interval x the multiplier (the value is then adapted based on the
2639  * write latency). The reason is that writes can be delayed under load and we
2640  * don't want readers to incorrectly assume that the filesystem is no longer
2641  * in use.
2642  */
2643 #define EXT4_MMP_CHECK_MULT             2UL
2644
2645 /*
2646  * Minimum interval for MMP checking in seconds.
2647  */
2648 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2649
2650 /*
2651  * Maximum interval for MMP checking in seconds.
2652  */
2653 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2654
2655 /*
2656  * Function prototypes
2657  */
2658
2659 /*
2660  * Ok, these declarations are also in <linux/kernel.h> but none of the
2661  * ext4 source programs needs to include it so they are duplicated here.
2662  */
2663 # define NORET_TYPE     /**/
2664 # define ATTRIB_NORET   __attribute__((noreturn))
2665 # define NORET_AND      noreturn,
2666
2667 /* bitmap.c */
2668 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2669 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2670                                 struct ext4_group_desc *gdp,
2671                                 struct buffer_head *bh, int sz);
2672 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2673                                   struct ext4_group_desc *gdp,
2674                                   struct buffer_head *bh, int sz);
2675 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2676                                 struct ext4_group_desc *gdp,
2677                                 struct buffer_head *bh);
2678 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2679                                   struct ext4_group_desc *gdp,
2680                                   struct buffer_head *bh);
2681
2682 /* balloc.c */
2683 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2684                                          ext4_fsblk_t blocknr,
2685                                          ext4_group_t *blockgrpp,
2686                                          ext4_grpblk_t *offsetp);
2687 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2688                                           ext4_fsblk_t block);
2689
2690 extern unsigned int ext4_block_group(struct super_block *sb,
2691                         ext4_fsblk_t blocknr);
2692 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2693                         ext4_fsblk_t blocknr);
2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696                         ext4_group_t group);
2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698                                          ext4_fsblk_t goal,
2699                                          unsigned int flags,
2700                                          unsigned long *count,
2701                                          int *errp);
2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703                                     s64 nclusters, unsigned int flags);
2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 extern void ext4_check_blocks_bitmap(struct super_block *);
2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707                                                     ext4_group_t block_group,
2708                                                     struct buffer_head ** bh);
2709 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2710
2711 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2712                                                 ext4_group_t block_group,
2713                                                 bool ignore_locked);
2714 extern int ext4_wait_block_bitmap(struct super_block *sb,
2715                                   ext4_group_t block_group,
2716                                   struct buffer_head *bh);
2717 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2718                                                   ext4_group_t block_group);
2719 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2720                                               ext4_group_t block_group,
2721                                               struct ext4_group_desc *gdp);
2722 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2723
2724 #if IS_ENABLED(CONFIG_UNICODE)
2725 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2726                                          const struct qstr *iname,
2727                                          struct ext4_filename *fname);
2728 #endif
2729
2730 #ifdef CONFIG_FS_ENCRYPTION
2731 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2732                                                 const struct fscrypt_name *src)
2733 {
2734         memset(dst, 0, sizeof(*dst));
2735
2736         dst->usr_fname = src->usr_fname;
2737         dst->disk_name = src->disk_name;
2738         dst->hinfo.hash = src->hash;
2739         dst->hinfo.minor_hash = src->minor_hash;
2740         dst->crypto_buf = src->crypto_buf;
2741 }
2742
2743 static inline int ext4_fname_setup_filename(struct inode *dir,
2744                                             const struct qstr *iname,
2745                                             int lookup,
2746                                             struct ext4_filename *fname)
2747 {
2748         struct fscrypt_name name;
2749         int err;
2750
2751         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2752         if (err)
2753                 return err;
2754
2755         ext4_fname_from_fscrypt_name(fname, &name);
2756
2757 #if IS_ENABLED(CONFIG_UNICODE)
2758         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2759 #endif
2760         return err;
2761 }
2762
2763 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2764                                             struct dentry *dentry,
2765                                             struct ext4_filename *fname)
2766 {
2767         struct fscrypt_name name;
2768         int err;
2769
2770         err = fscrypt_prepare_lookup(dir, dentry, &name);
2771         if (err)
2772                 return err;
2773
2774         ext4_fname_from_fscrypt_name(fname, &name);
2775
2776 #if IS_ENABLED(CONFIG_UNICODE)
2777         err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname);
2778 #endif
2779         return err;
2780 }
2781
2782 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2783 {
2784         struct fscrypt_name name;
2785
2786         name.crypto_buf = fname->crypto_buf;
2787         fscrypt_free_filename(&name);
2788
2789         fname->crypto_buf.name = NULL;
2790         fname->usr_fname = NULL;
2791         fname->disk_name.name = NULL;
2792
2793 #if IS_ENABLED(CONFIG_UNICODE)
2794         kfree(fname->cf_name.name);
2795         fname->cf_name.name = NULL;
2796 #endif
2797 }
2798 #else /* !CONFIG_FS_ENCRYPTION */
2799 static inline int ext4_fname_setup_filename(struct inode *dir,
2800                                             const struct qstr *iname,
2801                                             int lookup,
2802                                             struct ext4_filename *fname)
2803 {
2804         int err = 0;
2805         fname->usr_fname = iname;
2806         fname->disk_name.name = (unsigned char *) iname->name;
2807         fname->disk_name.len = iname->len;
2808
2809 #if IS_ENABLED(CONFIG_UNICODE)
2810         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2811 #endif
2812
2813         return err;
2814 }
2815
2816 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2817                                             struct dentry *dentry,
2818                                             struct ext4_filename *fname)
2819 {
2820         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2821 }
2822
2823 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2824 {
2825 #if IS_ENABLED(CONFIG_UNICODE)
2826         kfree(fname->cf_name.name);
2827         fname->cf_name.name = NULL;
2828 #endif
2829 }
2830 #endif /* !CONFIG_FS_ENCRYPTION */
2831
2832 /* dir.c */
2833 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2834                                   struct file *,
2835                                   struct ext4_dir_entry_2 *,
2836                                   struct buffer_head *, char *, int,
2837                                   unsigned int);
2838 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2839         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2840                                 (de), (bh), (buf), (size), (offset)))
2841 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2842                                 __u32 minor_hash,
2843                                 struct ext4_dir_entry_2 *dirent,
2844                                 struct fscrypt_str *ent_name);
2845 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2846 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2847                              struct buffer_head *bh,
2848                              void *buf, int buf_size,
2849                              struct ext4_filename *fname,
2850                              struct ext4_dir_entry_2 **dest_de);
2851 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2852                         struct ext4_dir_entry_2 *de,
2853                         int buf_size,
2854                         struct ext4_filename *fname);
2855 static inline void ext4_update_dx_flag(struct inode *inode)
2856 {
2857         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2858             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2859                 /* ext4_iget() should have caught this... */
2860                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2861                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2862         }
2863 }
2864 static const unsigned char ext4_filetype_table[] = {
2865         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2866 };
2867
2868 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2869 {
2870         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2871                 return DT_UNKNOWN;
2872
2873         return ext4_filetype_table[filetype];
2874 }
2875 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2876                              void *buf, int buf_size);
2877
2878 /* fsync.c */
2879 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2880
2881 /* hash.c */
2882 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2883                           struct dx_hash_info *hinfo);
2884
2885 /* ialloc.c */
2886 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2887 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2888                                       struct inode *, umode_t,
2889                                       const struct qstr *qstr, __u32 goal,
2890                                       uid_t *owner, __u32 i_flags,
2891                                       int handle_type, unsigned int line_no,
2892                                       int nblocks);
2893
2894 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2895         __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2896                          (goal), (owner), i_flags, 0, 0, 0)
2897 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2898                                     type, nblocks)                  \
2899         __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2900                          0, (type), __LINE__, (nblocks))
2901
2902
2903 extern void ext4_free_inode(handle_t *, struct inode *);
2904 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2905 extern unsigned long ext4_count_free_inodes(struct super_block *);
2906 extern unsigned long ext4_count_dirs(struct super_block *);
2907 extern void ext4_check_inodes_bitmap(struct super_block *);
2908 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2909 extern int ext4_init_inode_table(struct super_block *sb,
2910                                  ext4_group_t group, int barrier);
2911 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2912
2913 /* fast_commit.c */
2914 int ext4_fc_info_show(struct seq_file *seq, void *v);
2915 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2916 void ext4_fc_init_inode(struct inode *inode);
2917 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2918                          ext4_lblk_t end);
2919 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2920         struct dentry *dentry);
2921 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2922         struct dentry *dentry);
2923 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2924 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2925 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2926                             struct dentry *dentry);
2927 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2928 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2929 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2930 void ext4_fc_start_update(struct inode *inode);
2931 void ext4_fc_stop_update(struct inode *inode);
2932 void ext4_fc_del(struct inode *inode);
2933 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2934 void ext4_fc_replay_cleanup(struct super_block *sb);
2935 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2936 int __init ext4_fc_init_dentry_cache(void);
2937 void ext4_fc_destroy_dentry_cache(void);
2938 int ext4_fc_record_regions(struct super_block *sb, int ino,
2939                            ext4_lblk_t lblk, ext4_fsblk_t pblk,
2940                            int len, int replay);
2941
2942 /* mballoc.c */
2943 extern const struct seq_operations ext4_mb_seq_groups_ops;
2944 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2945 extern long ext4_mb_stats;
2946 extern long ext4_mb_max_to_scan;
2947 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2948 extern int ext4_mb_init(struct super_block *);
2949 extern int ext4_mb_release(struct super_block *);
2950 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2951                                 struct ext4_allocation_request *, int *);
2952 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2953 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2954 extern int __init ext4_init_mballoc(void);
2955 extern void ext4_exit_mballoc(void);
2956 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2957                                      ext4_group_t group,
2958                                      unsigned int nr, int *cnt);
2959 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2960                                   unsigned int nr);
2961
2962 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2963                              struct buffer_head *bh, ext4_fsblk_t block,
2964                              unsigned long count, int flags);
2965 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2966                                    ext4_group_t ngroups);
2967 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2968                 ext4_group_t i, struct ext4_group_desc *desc);
2969 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2970                                 ext4_fsblk_t block, unsigned long count);
2971 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2972 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2973 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2974                        int len, int state);
2975
2976 /* inode.c */
2977 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2978                          struct ext4_inode_info *ei);
2979 int ext4_inode_is_fast_symlink(struct inode *inode);
2980 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2981 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2982 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2983                      bool wait, struct buffer_head **bhs);
2984 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2985                              struct buffer_head *bh_result, int create);
2986 int ext4_get_block(struct inode *inode, sector_t iblock,
2987                    struct buffer_head *bh_result, int create);
2988 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2989                            struct buffer_head *bh, int create);
2990 int ext4_walk_page_buffers(handle_t *handle,
2991                            struct inode *inode,
2992                            struct buffer_head *head,
2993                            unsigned from,
2994                            unsigned to,
2995                            int *partial,
2996                            int (*fn)(handle_t *handle, struct inode *inode,
2997                                      struct buffer_head *bh));
2998 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2999                                 struct buffer_head *bh);
3000 #define FALL_BACK_TO_NONDELALLOC 1
3001 #define CONVERT_INLINE_DATA      2
3002
3003 typedef enum {
3004         EXT4_IGET_NORMAL =      0,
3005         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
3006         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
3007 } ext4_iget_flags;
3008
3009 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
3010                                  ext4_iget_flags flags, const char *function,
3011                                  unsigned int line);
3012
3013 #define ext4_iget(sb, ino, flags) \
3014         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3015
3016 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
3017 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
3018                          struct iattr *);
3019 extern int  ext4_getattr(struct user_namespace *, const struct path *,
3020                          struct kstat *, u32, unsigned int);
3021 extern void ext4_evict_inode(struct inode *);
3022 extern void ext4_clear_inode(struct inode *);
3023 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
3024                               struct kstat *, u32, unsigned int);
3025 extern int  ext4_sync_inode(handle_t *, struct inode *);
3026 extern void ext4_dirty_inode(struct inode *, int);
3027 extern int ext4_change_inode_journal_flag(struct inode *, int);
3028 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3029 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3030                           struct ext4_iloc *iloc);
3031 extern int ext4_inode_attach_jinode(struct inode *inode);
3032 extern int ext4_can_truncate(struct inode *inode);
3033 extern int ext4_truncate(struct inode *);
3034 extern int ext4_break_layouts(struct inode *);
3035 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
3036 extern void ext4_set_inode_flags(struct inode *, bool init);
3037 extern int ext4_alloc_da_blocks(struct inode *inode);
3038 extern void ext4_set_aops(struct inode *inode);
3039 extern int ext4_writepage_trans_blocks(struct inode *);
3040 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3041 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3042                              loff_t lstart, loff_t lend);
3043 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3044 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3045 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3046 extern void ext4_da_release_space(struct inode *inode, int to_free);
3047 extern void ext4_da_update_reserve_space(struct inode *inode,
3048                                         int used, int quota_claim);
3049 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3050                               ext4_fsblk_t pblk, ext4_lblk_t len);
3051
3052 /* indirect.c */
3053 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3054                                 struct ext4_map_blocks *map, int flags);
3055 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3056 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3057 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3058                                  ext4_lblk_t start, ext4_lblk_t end);
3059
3060 /* ioctl.c */
3061 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3062 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3063 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3064                       struct dentry *dentry, struct fileattr *fa);
3065 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3066 extern void ext4_reset_inode_seed(struct inode *inode);
3067
3068 /* migrate.c */
3069 extern int ext4_ext_migrate(struct inode *);
3070 extern int ext4_ind_migrate(struct inode *inode);
3071
3072 /* namei.c */
3073 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3074                              struct inode *inode);
3075 extern int ext4_dirblock_csum_verify(struct inode *inode,
3076                                      struct buffer_head *bh);
3077 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3078                                 __u32 start_minor_hash, __u32 *next_hash);
3079 extern int ext4_search_dir(struct buffer_head *bh,
3080                            char *search_buf,
3081                            int buf_size,
3082                            struct inode *dir,
3083                            struct ext4_filename *fname,
3084                            unsigned int offset,
3085                            struct ext4_dir_entry_2 **res_dir);
3086 extern int ext4_generic_delete_entry(struct inode *dir,
3087                                      struct ext4_dir_entry_2 *de_del,
3088                                      struct buffer_head *bh,
3089                                      void *entry_buf,
3090                                      int buf_size,
3091                                      int csum_size);
3092 extern bool ext4_empty_dir(struct inode *inode);
3093
3094 /* resize.c */
3095 extern void ext4_kvfree_array_rcu(void *to_free);
3096 extern int ext4_group_add(struct super_block *sb,
3097                                 struct ext4_new_group_data *input);
3098 extern int ext4_group_extend(struct super_block *sb,
3099                                 struct ext4_super_block *es,
3100                                 ext4_fsblk_t n_blocks_count);
3101 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3102 extern unsigned int ext4_list_backups(struct super_block *sb,
3103                                       unsigned int *three, unsigned int *five,
3104                                       unsigned int *seven);
3105
3106 /* super.c */
3107 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3108                                          sector_t block, int op_flags);
3109 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3110                                                    sector_t block);
3111 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3112                                 bh_end_io_t *end_io);
3113 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3114                         bh_end_io_t *end_io);
3115 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3116 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3117 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3118 extern int ext4_calculate_overhead(struct super_block *sb);
3119 extern __le32 ext4_superblock_csum(struct super_block *sb,
3120                                    struct ext4_super_block *es);
3121 extern void ext4_superblock_csum_set(struct super_block *sb);
3122 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3123                                     ext4_group_t ngroup);
3124 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3125                                      char nbuf[16]);
3126 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3127                                              ext4_group_t block_group,
3128                                              unsigned int flags);
3129
3130 extern __printf(7, 8)
3131 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3132                   int, __u64, const char *, ...);
3133 extern __printf(6, 7)
3134 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3135                         ext4_fsblk_t, int, const char *, ...);
3136 extern __printf(5, 6)
3137 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3138                      const char *, ...);
3139 extern void __ext4_std_error(struct super_block *, const char *,
3140                              unsigned int, int);
3141 extern __printf(4, 5)
3142 void __ext4_warning(struct super_block *, const char *, unsigned int,
3143                     const char *, ...);
3144 extern __printf(4, 5)
3145 void __ext4_warning_inode(const struct inode *inode, const char *function,
3146                           unsigned int line, const char *fmt, ...);
3147 extern __printf(3, 4)
3148 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3149 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3150                            const char *, unsigned int, const char *);
3151 extern __printf(7, 8)
3152 void __ext4_grp_locked_error(const char *, unsigned int,
3153                              struct super_block *, ext4_group_t,
3154                              unsigned long, ext4_fsblk_t,
3155                              const char *, ...);
3156
3157 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3158         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3159
3160 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3161         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3162
3163 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3164         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3165                            (fmt), ## a)
3166
3167 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3168         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3169
3170 #define ext4_abort(sb, err, fmt, a...)                                  \
3171         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3172
3173 #ifdef CONFIG_PRINTK
3174
3175 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3176         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3177 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3178         __ext4_error_inode((inode), (func), (line), (block),            \
3179                            (err), (fmt), ##__VA_ARGS__)
3180 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3181         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3182 #define ext4_error(sb, fmt, ...)                                        \
3183         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3184                 ##__VA_ARGS__)
3185 #define ext4_error_err(sb, err, fmt, ...)                               \
3186         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3187                 ##__VA_ARGS__)
3188 #define ext4_warning(sb, fmt, ...)                                      \
3189         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3190 #define ext4_warning_inode(inode, fmt, ...)                             \
3191         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3192 #define ext4_msg(sb, level, fmt, ...)                           \
3193         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3194 #define dump_mmp_msg(sb, mmp, msg)                                      \
3195         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3196 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3197         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3198                                 fmt, ##__VA_ARGS__)
3199
3200 #else
3201
3202 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3203 do {                                                                    \
3204         no_printk(fmt, ##__VA_ARGS__);                                  \
3205         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3206 } while (0)
3207 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3208 do {                                                                    \
3209         no_printk(fmt, ##__VA_ARGS__);                                  \
3210         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3211 } while (0)
3212 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3213 do {                                                                    \
3214         no_printk(fmt, ##__VA_ARGS__);                                  \
3215         __ext4_error_file(file, "", 0, block, " ");                     \
3216 } while (0)
3217 #define ext4_error(sb, fmt, ...)                                        \
3218 do {                                                                    \
3219         no_printk(fmt, ##__VA_ARGS__);                                  \
3220         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3221 } while (0)
3222 #define ext4_error_err(sb, err, fmt, ...)                               \
3223 do {                                                                    \
3224         no_printk(fmt, ##__VA_ARGS__);                                  \
3225         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3226 } while (0)
3227 #define ext4_warning(sb, fmt, ...)                                      \
3228 do {                                                                    \
3229         no_printk(fmt, ##__VA_ARGS__);                                  \
3230         __ext4_warning(sb, "", 0, " ");                                 \
3231 } while (0)
3232 #define ext4_warning_inode(inode, fmt, ...)                             \
3233 do {                                                                    \
3234         no_printk(fmt, ##__VA_ARGS__);                                  \
3235         __ext4_warning_inode(inode, "", 0, " ");                        \
3236 } while (0)
3237 #define ext4_msg(sb, level, fmt, ...)                                   \
3238 do {                                                                    \
3239         no_printk(fmt, ##__VA_ARGS__);                                  \
3240         __ext4_msg(sb, "", " ");                                        \
3241 } while (0)
3242 #define dump_mmp_msg(sb, mmp, msg)                                      \
3243         __dump_mmp_msg(sb, mmp, "", 0, "")
3244 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3245 do {                                                                    \
3246         no_printk(fmt, ##__VA_ARGS__);                          \
3247         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3248 } while (0)
3249
3250 #endif
3251
3252 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3253                                       struct ext4_group_desc *bg);
3254 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3255                                       struct ext4_group_desc *bg);
3256 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3257                                      struct ext4_group_desc *bg);
3258 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3259                                       struct ext4_group_desc *bg);
3260 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3261                                  struct ext4_group_desc *bg);
3262 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3263                                 struct ext4_group_desc *bg);
3264 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3265                                    struct ext4_group_desc *bg);
3266 extern void ext4_block_bitmap_set(struct super_block *sb,
3267                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3268 extern void ext4_inode_bitmap_set(struct super_block *sb,
3269                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3270 extern void ext4_inode_table_set(struct super_block *sb,
3271                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3272 extern void ext4_free_group_clusters_set(struct super_block *sb,
3273                                          struct ext4_group_desc *bg,
3274                                          __u32 count);
3275 extern void ext4_free_inodes_set(struct super_block *sb,
3276                                 struct ext4_group_desc *bg, __u32 count);
3277 extern void ext4_used_dirs_set(struct super_block *sb,
3278                                 struct ext4_group_desc *bg, __u32 count);
3279 extern void ext4_itable_unused_set(struct super_block *sb,
3280                                    struct ext4_group_desc *bg, __u32 count);
3281 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3282                                        struct ext4_group_desc *gdp);
3283 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3284                                      struct ext4_group_desc *gdp);
3285 extern int ext4_register_li_request(struct super_block *sb,
3286                                     ext4_group_t first_not_zeroed);
3287
3288 static inline int ext4_has_metadata_csum(struct super_block *sb)
3289 {
3290         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3291                      !EXT4_SB(sb)->s_chksum_driver);
3292
3293         return ext4_has_feature_metadata_csum(sb) &&
3294                (EXT4_SB(sb)->s_chksum_driver != NULL);
3295 }
3296
3297 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3298 {
3299         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3300 }
3301
3302 #define ext4_read_incompat_64bit_val(es, name) \
3303         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3304                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3305                 le32_to_cpu(es->name##_lo))
3306
3307 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3308 {
3309         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3310 }
3311
3312 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3313 {
3314         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3315 }
3316
3317 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3318 {
3319         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3320 }
3321
3322 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3323                                          ext4_fsblk_t blk)
3324 {
3325         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3326         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3327 }
3328
3329 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3330                                               ext4_fsblk_t blk)
3331 {
3332         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3333         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3334 }
3335
3336 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3337                                            ext4_fsblk_t blk)
3338 {
3339         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3340         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3341 }
3342
3343 static inline loff_t ext4_isize(struct super_block *sb,
3344                                 struct ext4_inode *raw_inode)
3345 {
3346         if (ext4_has_feature_largedir(sb) ||
3347             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3348                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3349                         le32_to_cpu(raw_inode->i_size_lo);
3350
3351         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3352 }
3353
3354 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3355 {
3356         raw_inode->i_size_lo = cpu_to_le32(i_size);
3357         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3358 }
3359
3360 static inline
3361 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3362                                             ext4_group_t group)
3363 {
3364          struct ext4_group_info **grp_info;
3365          long indexv, indexh;
3366          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3367          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3368          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3369          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3370          return grp_info[indexh];
3371 }
3372
3373 /*
3374  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3375  * the locking protocol documented in the comments of ext4_group_add()
3376  * in resize.c
3377  */
3378 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3379 {
3380         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3381
3382         smp_rmb();
3383         return ngroups;
3384 }
3385
3386 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3387                                              ext4_group_t block_group)
3388 {
3389         return block_group >> sbi->s_log_groups_per_flex;
3390 }
3391
3392 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3393 {
3394         return 1 << sbi->s_log_groups_per_flex;
3395 }
3396
3397 #define ext4_std_error(sb, errno)                               \
3398 do {                                                            \
3399         if ((errno))                                            \
3400                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3401 } while (0)
3402
3403 #ifdef CONFIG_SMP
3404 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3405  * counters. So we need to make sure we have free clusters more
3406  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3407  */
3408 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3409 #else
3410 #define EXT4_FREECLUSTERS_WATERMARK 0
3411 #endif
3412
3413 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3414 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3415 {
3416         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3417                      !inode_is_locked(inode));
3418         down_write(&EXT4_I(inode)->i_data_sem);
3419         if (newsize > EXT4_I(inode)->i_disksize)
3420                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3421         up_write(&EXT4_I(inode)->i_data_sem);
3422 }
3423
3424 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3425 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3426 {
3427         int changed = 0;
3428
3429         if (newsize > inode->i_size) {
3430                 i_size_write(inode, newsize);
3431                 changed = 1;
3432         }
3433         if (newsize > EXT4_I(inode)->i_disksize) {
3434                 ext4_update_i_disksize(inode, newsize);
3435                 changed |= 2;
3436         }
3437         return changed;
3438 }
3439
3440 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3441                                       loff_t len);
3442
3443 struct ext4_group_info {
3444         unsigned long   bb_state;
3445 #ifdef AGGRESSIVE_CHECK
3446         unsigned long   bb_check_counter;
3447 #endif
3448         struct rb_root  bb_free_root;
3449         ext4_grpblk_t   bb_first_free;  /* first free block */
3450         ext4_grpblk_t   bb_free;        /* total free blocks */
3451         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3452         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3453         ext4_group_t    bb_group;       /* Group number */
3454         struct          list_head bb_prealloc_list;
3455 #ifdef DOUBLE_CHECK
3456         void            *bb_bitmap;
3457 #endif
3458         struct rw_semaphore alloc_sem;
3459         struct rb_node  bb_avg_fragment_size_rb;
3460         struct list_head bb_largest_free_order_node;
3461         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3462                                          * regions, index is order.
3463                                          * bb_counters[3] = 5 means
3464                                          * 5 free 8-block regions. */
3465 };
3466
3467 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3468 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3469 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3470 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3471 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3472         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3473 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3474         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3475 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3476
3477 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3478         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3479 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3480         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3481 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3482         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3483
3484 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3485         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3486 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3487         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3488 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3489         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3490 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3491         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3492
3493 #define EXT4_MAX_CONTENTION             8
3494 #define EXT4_CONTENTION_THRESHOLD       2
3495
3496 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3497                                               ext4_group_t group)
3498 {
3499         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3500 }
3501
3502 /*
3503  * Returns true if the filesystem is busy enough that attempts to
3504  * access the block group locks has run into contention.
3505  */
3506 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3507 {
3508         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3509 }
3510
3511 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3512 {
3513         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3514         if (spin_trylock(lock))
3515                 /*
3516                  * We're able to grab the lock right away, so drop the
3517                  * lock contention counter.
3518                  */
3519                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3520         else {
3521                 /*
3522                  * The lock is busy, so bump the contention counter,
3523                  * and then wait on the spin lock.
3524                  */
3525                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3526                                   EXT4_MAX_CONTENTION);
3527                 spin_lock(lock);
3528         }
3529 }
3530
3531 static inline void ext4_unlock_group(struct super_block *sb,
3532                                         ext4_group_t group)
3533 {
3534         spin_unlock(ext4_group_lock_ptr(sb, group));
3535 }
3536
3537 #ifdef CONFIG_QUOTA
3538 static inline bool ext4_quota_capable(struct super_block *sb)
3539 {
3540         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3541 }
3542
3543 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3544 {
3545         struct ext4_sb_info *sbi = EXT4_SB(sb);
3546
3547         return (ext4_has_feature_quota(sb) ||
3548                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3549 }
3550 int ext4_enable_quotas(struct super_block *sb);
3551 #endif
3552
3553 /*
3554  * Block validity checking
3555  */
3556 #define ext4_check_indirect_blockref(inode, bh)                         \
3557         ext4_check_blockref(__func__, __LINE__, inode,                  \
3558                             (__le32 *)(bh)->b_data,                     \
3559                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3560
3561 #define ext4_ind_check_inode(inode)                                     \
3562         ext4_check_blockref(__func__, __LINE__, inode,                  \
3563                             EXT4_I(inode)->i_data,                      \
3564                             EXT4_NDIR_BLOCKS)
3565
3566 /*
3567  * Inodes and files operations
3568  */
3569
3570 /* dir.c */
3571 extern const struct file_operations ext4_dir_operations;
3572
3573 /* file.c */
3574 extern const struct inode_operations ext4_file_inode_operations;
3575 extern const struct file_operations ext4_file_operations;
3576 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3577
3578 /* inline.c */
3579 extern int ext4_get_max_inline_size(struct inode *inode);
3580 extern int ext4_find_inline_data_nolock(struct inode *inode);
3581 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3582                                  unsigned int len);
3583 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3584
3585 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3586 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3587                                          struct inode *inode,
3588                                          loff_t pos, unsigned len,
3589                                          unsigned flags,
3590                                          struct page **pagep);
3591 extern int ext4_write_inline_data_end(struct inode *inode,
3592                                       loff_t pos, unsigned len,
3593                                       unsigned copied,
3594                                       struct page *page);
3595 extern struct buffer_head *
3596 ext4_journalled_write_inline_data(struct inode *inode,
3597                                   unsigned len,
3598                                   struct page *page);
3599 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3600                                            struct inode *inode,
3601                                            loff_t pos, unsigned len,
3602                                            unsigned flags,
3603                                            struct page **pagep,
3604                                            void **fsdata);
3605 extern int ext4_try_add_inline_entry(handle_t *handle,
3606                                      struct ext4_filename *fname,
3607                                      struct inode *dir, struct inode *inode);
3608 extern int ext4_try_create_inline_dir(handle_t *handle,
3609                                       struct inode *parent,
3610                                       struct inode *inode);
3611 extern int ext4_read_inline_dir(struct file *filp,
3612                                 struct dir_context *ctx,
3613                                 int *has_inline_data);
3614 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3615                                   struct inode *dir, ext4_lblk_t block,
3616                                   struct dx_hash_info *hinfo,
3617                                   __u32 start_hash, __u32 start_minor_hash,
3618                                   int *has_inline_data);
3619 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3620                                         struct ext4_filename *fname,
3621                                         struct ext4_dir_entry_2 **res_dir,
3622                                         int *has_inline_data);
3623 extern int ext4_delete_inline_entry(handle_t *handle,
3624                                     struct inode *dir,
3625                                     struct ext4_dir_entry_2 *de_del,
3626                                     struct buffer_head *bh,
3627                                     int *has_inline_data);
3628 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3629 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3630                                         struct ext4_dir_entry_2 **parent_de,
3631                                         int *retval);
3632 extern int ext4_inline_data_fiemap(struct inode *inode,
3633                                    struct fiemap_extent_info *fieinfo,
3634                                    int *has_inline, __u64 start, __u64 len);
3635
3636 struct iomap;
3637 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3638
3639 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3640
3641 extern int ext4_convert_inline_data(struct inode *inode);
3642
3643 static inline int ext4_has_inline_data(struct inode *inode)
3644 {
3645         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3646                EXT4_I(inode)->i_inline_off;
3647 }
3648
3649 /* namei.c */
3650 extern const struct inode_operations ext4_dir_inode_operations;
3651 extern const struct inode_operations ext4_special_inode_operations;
3652 extern struct dentry *ext4_get_parent(struct dentry *child);
3653 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3654                                  struct ext4_dir_entry_2 *de,
3655                                  int blocksize, int csum_size,
3656                                  unsigned int parent_ino, int dotdot_real_len);
3657 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3658                                         unsigned int blocksize);
3659 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3660                                       struct buffer_head *bh);
3661 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3662                          struct inode *inode);
3663 extern int __ext4_link(struct inode *dir, struct inode *inode,
3664                        struct dentry *dentry);
3665
3666 #define S_SHIFT 12
3667 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3668         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3669         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3670         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3671         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3672         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3673         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3674         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3675 };
3676
3677 static inline void ext4_set_de_type(struct super_block *sb,
3678                                 struct ext4_dir_entry_2 *de,
3679                                 umode_t mode) {
3680         if (ext4_has_feature_filetype(sb))
3681                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3682 }
3683
3684 /* readpages.c */
3685 extern int ext4_mpage_readpages(struct inode *inode,
3686                 struct readahead_control *rac, struct page *page);
3687 extern int __init ext4_init_post_read_processing(void);
3688 extern void ext4_exit_post_read_processing(void);
3689
3690 /* symlink.c */
3691 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3692 extern const struct inode_operations ext4_symlink_inode_operations;
3693 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3694
3695 /* sysfs.c */
3696 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3697 extern int ext4_register_sysfs(struct super_block *sb);
3698 extern void ext4_unregister_sysfs(struct super_block *sb);
3699 extern int __init ext4_init_sysfs(void);
3700 extern void ext4_exit_sysfs(void);
3701
3702 /* block_validity */
3703 extern void ext4_release_system_zone(struct super_block *sb);
3704 extern int ext4_setup_system_zone(struct super_block *sb);
3705 extern int __init ext4_init_system_zone(void);
3706 extern void ext4_exit_system_zone(void);
3707 extern int ext4_inode_block_valid(struct inode *inode,
3708                                   ext4_fsblk_t start_blk,
3709                                   unsigned int count);
3710 extern int ext4_check_blockref(const char *, unsigned int,
3711                                struct inode *, __le32 *, unsigned int);
3712 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3713                                 ext4_fsblk_t start_blk, unsigned int count);
3714
3715
3716 /* extents.c */
3717 struct ext4_ext_path;
3718 struct ext4_extent;
3719
3720 /*
3721  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3722  * __le32.
3723  */
3724 #define EXT_MAX_BLOCKS  0xffffffff
3725
3726 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3727 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3728 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3729                                struct ext4_map_blocks *map, int flags);
3730 extern int ext4_ext_truncate(handle_t *, struct inode *);
3731 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3732                                  ext4_lblk_t end);
3733 extern void ext4_ext_init(struct super_block *);
3734 extern void ext4_ext_release(struct super_block *);
3735 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3736                           loff_t len);
3737 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3738                                           loff_t offset, ssize_t len);
3739 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3740                                              ext4_io_end_t *io_end);
3741 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3742                            struct ext4_map_blocks *map, int flags);
3743 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3744                                                    int num,
3745                                                    struct ext4_ext_path *path);
3746 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3747                                   struct ext4_ext_path **,
3748                                   struct ext4_extent *, int);
3749 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3750                                               struct ext4_ext_path **,
3751                                               int flags);
3752 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3753 extern int ext4_ext_check_inode(struct inode *inode);
3754 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3755 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3756                         __u64 start, __u64 len);
3757 extern int ext4_get_es_cache(struct inode *inode,
3758                              struct fiemap_extent_info *fieinfo,
3759                              __u64 start, __u64 len);
3760 extern int ext4_ext_precache(struct inode *inode);
3761 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3762                                 struct inode *inode2, ext4_lblk_t lblk1,
3763                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3764                              int mark_unwritten,int *err);
3765 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3766 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3767                                        int check_cred, int restart_cred,
3768                                        int revoke_cred);
3769 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3770 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3771 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3772                 int len, int unwritten, ext4_fsblk_t pblk);
3773 extern int ext4_ext_clear_bb(struct inode *inode);
3774
3775
3776 /* move_extent.c */
3777 extern void ext4_double_down_write_data_sem(struct inode *first,
3778                                             struct inode *second);
3779 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3780                                           struct inode *donor_inode);
3781 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3782                              __u64 start_orig, __u64 start_donor,
3783                              __u64 len, __u64 *moved_len);
3784
3785 /* page-io.c */
3786 extern int __init ext4_init_pageio(void);
3787 extern void ext4_exit_pageio(void);
3788 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3789 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3790 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3791 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3792 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3793                                 struct writeback_control *wbc);
3794 extern void ext4_end_io_rsv_work(struct work_struct *work);
3795 extern void ext4_io_submit(struct ext4_io_submit *io);
3796 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3797                                struct page *page,
3798                                int len,
3799                                bool keep_towrite);
3800 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3801 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3802
3803 /* mmp.c */
3804 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3805
3806 /* mmp.c */
3807 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3808
3809 /* verity.c */
3810 extern const struct fsverity_operations ext4_verityops;
3811
3812 /* orphan.c */
3813 extern int ext4_orphan_add(handle_t *, struct inode *);
3814 extern int ext4_orphan_del(handle_t *, struct inode *);
3815 extern void ext4_orphan_cleanup(struct super_block *sb,
3816                                 struct ext4_super_block *es);
3817 extern void ext4_release_orphan_info(struct super_block *sb);
3818 extern int ext4_init_orphan_info(struct super_block *sb);
3819 extern int ext4_orphan_file_empty(struct super_block *sb);
3820 extern void ext4_orphan_file_block_trigger(
3821                                 struct jbd2_buffer_trigger_type *triggers,
3822                                 struct buffer_head *bh,
3823                                 void *data, size_t size);
3824
3825 /*
3826  * Add new method to test whether block and inode bitmaps are properly
3827  * initialized. With uninit_bg reading the block from disk is not enough
3828  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3829  */
3830 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3831
3832 static inline int bitmap_uptodate(struct buffer_head *bh)
3833 {
3834         return (buffer_uptodate(bh) &&
3835                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3836 }
3837 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3838 {
3839         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3840 }
3841
3842 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3843
3844 /* For ioend & aio unwritten conversion wait queues */
3845 #define EXT4_WQ_HASH_SZ         37
3846 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3847                                             EXT4_WQ_HASH_SZ])
3848 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3849
3850 extern int ext4_resize_begin(struct super_block *sb);
3851 extern void ext4_resize_end(struct super_block *sb);
3852
3853 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3854                                               struct ext4_io_end *io_end)
3855 {
3856         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3857                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3858                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3859         }
3860 }
3861
3862 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3863 {
3864         struct inode *inode = io_end->inode;
3865
3866         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3867                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3868                 /* Wake up anyone waiting on unwritten extent conversion */
3869                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3870                         wake_up_all(ext4_ioend_wq(inode));
3871         }
3872 }
3873
3874 extern const struct iomap_ops ext4_iomap_ops;
3875 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3876 extern const struct iomap_ops ext4_iomap_report_ops;
3877
3878 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3879 {
3880         /*
3881          * If the buffer has the write error flag, we have failed
3882          * to write out data in the block.  In this  case, we don't
3883          * have to read the block because we may read the old data
3884          * successfully.
3885          */
3886         if (buffer_write_io_error(bh))
3887                 set_buffer_uptodate(bh);
3888         return buffer_uptodate(bh);
3889 }
3890
3891 #endif  /* __KERNEL__ */
3892
3893 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3894 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3895
3896 #endif  /* _EXT4_H */