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/types.h>
  21 #include <linux/blkdev.h>
  22 #include <linux/magic.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/quota.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/rbtree.h>
  27 #include <linux/seqlock.h>
  28 #include <linux/mutex.h>
  29 #include <linux/timer.h>
  30 #include <linux/wait.h>
  31 #include <linux/sched/signal.h>
  32 #include <linux/blockgroup_lock.h>
  33 #include <linux/percpu_counter.h>
  34 #include <linux/ratelimit.h>
  35 #include <crypto/hash.h>
  36 #include <linux/falloc.h>
  37 #include <linux/percpu-rwsem.h>
  38 #include <linux/fiemap.h>
  39 #ifdef __KERNEL__
  40 #include <linux/compat.h>
  41 #endif
  42
  43 #include <linux/fscrypt.h>
  44 #include <linux/fsverity.h>
  45
  46 #include <linux/compiler.h>
  47
  48 /*
  49  * The fourth extended filesystem constants/structures
  50  */
  51
  52 /*
  53  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  54  * structures. these checks slow things down a lot
  55  */
  56 #define AGGRESSIVE_CHECK__
  57
  58 /*
  59  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  60  * bitmaps, maintains and uses them to check for double allocations
  61  */
  62 #define DOUBLE_CHECK__
  63
  64 /*
  65  * Define EXT4FS_DEBUG to produce debug messages
  66  */
  67 #undef EXT4FS_DEBUG
  68
  69 /*
  70  * Debug code
  71  */
  72 #ifdef EXT4FS_DEBUG
  73 #define ext4_debug(f, a...)                                             \
  74         do {                                                            \
  75                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  76                         __FILE__, __LINE__, __func__);                  \
  77                 printk(KERN_DEBUG f, ## a);                             \
  78         } while (0)
  79 #else
  80 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  81 #endif
  82
  83  /*
  84   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  85   */
  86 #define EXT_DEBUG__
  87
  88 /*
  89  * Dynamic printk for controlled extents debugging.
  90  */
  91 #ifdef CONFIG_EXT4_DEBUG
  92 #define ext_debug(ino, fmt, ...)                                        \
  93         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  94                  current->comm, task_pid_nr(current),                   \
  95                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  96                  __func__, ##__VA_ARGS__)
  97 #else
  98 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
  99 #endif
 100
 101 #define ASSERT(assert)                                          \
 102 do {                                                                    \
 103         if (unlikely(!(assert))) {                                      \
 104                 printk(KERN_EMERG                                       \
 105                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 106                        __func__, __FILE__, __LINE__, #assert);          \
 107                 BUG();                                                  \
 108         }                                                               \
 109 } while (0)
 110
 111 /* data type for block offset of block group */
 112 typedef int ext4_grpblk_t;
 113
 114 /* data type for filesystem-wide blocks number */
 115 typedef unsigned long long ext4_fsblk_t;
 116
 117 /* data type for file logical block number */
 118 typedef __u32 ext4_lblk_t;
 119
 120 /* data type for block group number */
 121 typedef unsigned int ext4_group_t;
 122
 123 enum SHIFT_DIRECTION {
 124         SHIFT_LEFT = 0,
 125         SHIFT_RIGHT,
 126 };
 127
 128 /*
 129  * Flags used in mballoc's allocation_context flags field.
 130  *
 131  * Also used to show what's going on for debugging purposes when the
 132  * flag field is exported via the traceport interface
 133  */
 134
 135 /* prefer goal again. length */
 136 #define EXT4_MB_HINT_MERGE              0x0001
 137 /* blocks already reserved */
 138 #define EXT4_MB_HINT_RESERVED           0x0002
 139 /* metadata is being allocated */
 140 #define EXT4_MB_HINT_METADATA           0x0004
 141 /* first blocks in the file */
 142 #define EXT4_MB_HINT_FIRST              0x0008
 143 /* search for the best chunk */
 144 #define EXT4_MB_HINT_BEST               0x0010
 145 /* data is being allocated */
 146 #define EXT4_MB_HINT_DATA               0x0020
 147 /* don't preallocate (for tails) */
 148 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 149 /* allocate for locality group */
 150 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 151 /* allocate goal blocks or none */
 152 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 153 /* goal is meaningful */
 154 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 155 /* blocks already pre-reserved by delayed allocation */
 156 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 157 /* We are doing stream allocation */
 158 #define EXT4_MB_STREAM_ALLOC            0x0800
 159 /* Use reserved root blocks if needed */
 160 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 161 /* Use blocks from reserved pool */
 162 #define EXT4_MB_USE_RESERVED            0x2000
 163 /* Do strict check for free blocks while retrying block allocation */
 164 #define EXT4_MB_STRICT_CHECK            0x4000
 165 /* Large fragment size list lookup succeeded at least once for cr = 0 */
 166 #define EXT4_MB_CR0_OPTIMIZED           0x8000
 167 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
 168 #define EXT4_MB_CR1_OPTIMIZED           0x00010000
 169 /* Perform linear traversal for one group */
 170 #define EXT4_MB_SEARCH_NEXT_LINEAR      0x00020000
 171 struct ext4_allocation_request {
 172         /* target inode for block we're allocating */
 173         struct inode *inode;
 174         /* how many blocks we want to allocate */
 175         unsigned int len;
 176         /* logical block in target inode */
 177         ext4_lblk_t logical;
 178         /* the closest logical allocated block to the left */
 179         ext4_lblk_t lleft;
 180         /* the closest logical allocated block to the right */
 181         ext4_lblk_t lright;
 182         /* phys. target (a hint) */
 183         ext4_fsblk_t goal;
 184         /* phys. block for the closest logical allocated block to the left */
 185         ext4_fsblk_t pleft;
 186         /* phys. block for the closest logical allocated block to the right */
 187         ext4_fsblk_t pright;
 188         /* flags. see above EXT4_MB_HINT_* */
 189         unsigned int flags;
 190 };
 191
 192 /*
 193  * Logical to physical block mapping, used by ext4_map_blocks()
 194  *
 195  * This structure is used to pass requests into ext4_map_blocks() as
 196  * well as to store the information returned by ext4_map_blocks().  It
 197  * takes less room on the stack than a struct buffer_head.
 198  */
 199 #define EXT4_MAP_NEW            BIT(BH_New)
 200 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 201 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 202 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 203 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 204                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 205
 206 struct ext4_map_blocks {
 207         ext4_fsblk_t m_pblk;
 208         ext4_lblk_t m_lblk;
 209         unsigned int m_len;
 210         unsigned int m_flags;
 211 };
 212
 213 /*
 214  * Block validity checking, system zone rbtree.
 215  */
 216 struct ext4_system_blocks {
 217         struct rb_root root;
 218         struct rcu_head rcu;
 219 };
 220
 221 /*
 222  * Flags for ext4_io_end->flags
 223  */
 224 #define EXT4_IO_END_UNWRITTEN   0x0001
 225
 226 struct ext4_io_end_vec {
 227         struct list_head list;          /* list of io_end_vec */
 228         loff_t offset;                  /* offset in the file */
 229         ssize_t size;                   /* size of the extent */
 230 };
 231
 232 /*
 233  * For converting unwritten extents on a work queue. 'handle' is used for
 234  * buffered writeback.
 235  */
 236 typedef struct ext4_io_end {
 237         struct list_head        list;           /* per-file finished IO list */
 238         handle_t                *handle;        /* handle reserved for extent
 239                                                  * conversion */
 240         struct inode            *inode;         /* file being written to */
 241         struct bio              *bio;           /* Linked list of completed
 242                                                  * bios covering the extent */
 243         unsigned int            flag;           /* unwritten or not */
 244         atomic_t                count;          /* reference counter */
 245         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 246 } ext4_io_end_t;
 247
 248 struct ext4_io_submit {
 249         struct writeback_control *io_wbc;
 250         struct bio              *io_bio;
 251         ext4_io_end_t           *io_end;
 252         sector_t                io_next_block;
 253 };
 254
 255 /*
 256  * Special inodes numbers
 257  */
 258 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 259 #define EXT4_ROOT_INO            2      /* Root inode */
 260 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 261 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 262 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 263 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 264 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 265 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 266
 267 /* First non-reserved inode for old ext4 filesystems */
 268 #define EXT4_GOOD_OLD_FIRST_INO 11
 269
 270 /*
 271  * Maximal count of links to a file
 272  */
 273 #define EXT4_LINK_MAX           65000
 274
 275 /*
 276  * Macro-instructions used to manage several block sizes
 277  */
 278 #define EXT4_MIN_BLOCK_SIZE             1024
 279 #define EXT4_MAX_BLOCK_SIZE             65536
 280 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 281 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 282 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 283 #ifdef __KERNEL__
 284 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 285 #else
 286 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 287 #endif
 288 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 289 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 290                                          EXT4_SB(s)->s_cluster_bits)
 291 #ifdef __KERNEL__
 292 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 293 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 294 #else
 295 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 296 #endif
 297 #ifdef __KERNEL__
 298 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 299 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 300 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 301 #else
 302 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 303                                  EXT4_GOOD_OLD_INODE_SIZE : \
 304                                  (s)->s_inode_size)
 305 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 306                                  EXT4_GOOD_OLD_FIRST_INO : \
 307                                  (s)->s_first_ino)
 308 #endif
 309 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 310 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 311         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 312                                                                   blkbits))
 313
 314 /* Translate a block number to a cluster number */
 315 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 316 /* Translate a cluster number to a block number */
 317 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 318 /* Translate # of blks to # of clusters */
 319 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 320                                  (sbi)->s_cluster_bits)
 321 /* Mask out the low bits to get the starting block of the cluster */
 322 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 323                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 324 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 325                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 326 /* Fill in the low bits to get the last block of the cluster */
 327 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 328                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 329 /* Get the cluster offset */
 330 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 331                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 332 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 333                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 334
 335 /*
 336  * Structure of a blocks group descriptor
 337  */
 338 struct ext4_group_desc
 339 {
 340         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 341         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 342         __le32  bg_inode_table_lo;      /* Inodes table block */
 343         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 344         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 345         __le16  bg_used_dirs_count_lo;  /* Directories count */
 346         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 347         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 348         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 349         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 350         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 351         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 352         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 353         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 354         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 355         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 356         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 357         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 358         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 359         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 360         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 361         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 362         __u32   bg_reserved;
 363 };
 364
 365 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 366         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 367          sizeof(__le16))
 368 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 369         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 370          sizeof(__le16))
 371
 372 /*
 373  * Structure of a flex block group info
 374  */
 375
 376 struct flex_groups {
 377         atomic64_t      free_clusters;
 378         atomic_t        free_inodes;
 379         atomic_t        used_dirs;
 380 };
 381
 382 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 383 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 384 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 385
 386 /*
 387  * Macro-instructions used to manage group descriptors
 388  */
 389 #define EXT4_MIN_DESC_SIZE              32
 390 #define EXT4_MIN_DESC_SIZE_64BIT        64
 391 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 392 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 393 #ifdef __KERNEL__
 394 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 395 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 396 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 397 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 398 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 399 #else
 400 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 401 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 402 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 403 #endif
 404
 405 /*
 406  * Constants relative to the data blocks
 407  */
 408 #define EXT4_NDIR_BLOCKS                12
 409 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 410 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 411 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 412 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 413
 414 /*
 415  * Inode flags
 416  */
 417 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 418 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 419 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 420 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 421 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 422 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 423 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 424 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 425 /* Reserved for compression usage... */
 426 #define EXT4_DIRTY_FL                   0x00000100
 427 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 428 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 429         /* nb: was previously EXT2_ECOMPR_FL */
 430 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 431 /* End compression flags --- maybe not all used */
 432 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 433 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 434 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 435 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 436 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 437 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 438 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 439 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 440 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 441 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 442 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 443
 444 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 445
 446 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 447 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 448 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 449 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 450
 451 /* User modifiable flags */
 452 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 453                                          EXT4_UNRM_FL | \
 454                                          EXT4_COMPR_FL | \
 455                                          EXT4_SYNC_FL | \
 456                                          EXT4_IMMUTABLE_FL | \
 457                                          EXT4_APPEND_FL | \
 458                                          EXT4_NODUMP_FL | \
 459                                          EXT4_NOATIME_FL | \
 460                                          EXT4_JOURNAL_DATA_FL | \
 461                                          EXT4_NOTAIL_FL | \
 462                                          EXT4_DIRSYNC_FL | \
 463                                          EXT4_TOPDIR_FL | \
 464                                          EXT4_EXTENTS_FL | \
 465                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 466                                          EXT4_DAX_FL | \
 467                                          EXT4_PROJINHERIT_FL | \
 468                                          EXT4_CASEFOLD_FL)
 469
 470 /* User visible flags */
 471 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 472                                          EXT4_DIRTY_FL | \
 473                                          EXT4_COMPRBLK_FL | \
 474                                          EXT4_NOCOMPR_FL | \
 475                                          EXT4_ENCRYPT_FL | \
 476                                          EXT4_INDEX_FL | \
 477                                          EXT4_VERITY_FL | \
 478                                          EXT4_INLINE_DATA_FL)
 479
 480 /* Flags that should be inherited by new inodes from their parent. */
 481 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 482                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 483                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 484                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 485                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 486                            EXT4_DAX_FL)
 487
 488 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 489 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 490                            EXT4_PROJINHERIT_FL))
 491
 492 /* Flags that are appropriate for non-directories/regular files. */
 493 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 494
 495 /* The only flags that should be swapped */
 496 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 497
 498 /* Flags which are mutually exclusive to DAX */
 499 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 500                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 501
 502 /* Mask out flags that are inappropriate for the given type of inode. */
 503 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 504 {
 505         if (S_ISDIR(mode))
 506                 return flags;
 507         else if (S_ISREG(mode))
 508                 return flags & EXT4_REG_FLMASK;
 509         else
 510                 return flags & EXT4_OTHER_FLMASK;
 511 }
 512
 513 /*
 514  * Inode flags used for atomic set/get
 515  */
 516 enum {
 517         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 518         EXT4_INODE_UNRM         = 1,    /* Undelete */
 519         EXT4_INODE_COMPR        = 2,    /* Compress file */
 520         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 521         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 522         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 523         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 524         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 525 /* Reserved for compression usage... */
 526         EXT4_INODE_DIRTY        = 8,
 527         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 528         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 529         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 530 /* End compression flags --- maybe not all used */
 531         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 532         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 533         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 534         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 535         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 536         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 537         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 538         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 539         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 540         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 541 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 542         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 543         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 544         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 545         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 546         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 547 };
 548
 549 /*
 550  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 551  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 552  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 553  * any extra space in the compiled kernel image, otherwise, the build will fail.
 554  * It's important that these values are the same, since we are using
 555  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 556  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 557  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 558  * defined in e2fsprogs.
 559  *
 560  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 561  */
 562 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 563 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 564
 565 static inline void ext4_check_flag_values(void)
 566 {
 567         CHECK_FLAG_VALUE(SECRM);
 568         CHECK_FLAG_VALUE(UNRM);
 569         CHECK_FLAG_VALUE(COMPR);
 570         CHECK_FLAG_VALUE(SYNC);
 571         CHECK_FLAG_VALUE(IMMUTABLE);
 572         CHECK_FLAG_VALUE(APPEND);
 573         CHECK_FLAG_VALUE(NODUMP);
 574         CHECK_FLAG_VALUE(NOATIME);
 575         CHECK_FLAG_VALUE(DIRTY);
 576         CHECK_FLAG_VALUE(COMPRBLK);
 577         CHECK_FLAG_VALUE(NOCOMPR);
 578         CHECK_FLAG_VALUE(ENCRYPT);
 579         CHECK_FLAG_VALUE(INDEX);
 580         CHECK_FLAG_VALUE(IMAGIC);
 581         CHECK_FLAG_VALUE(JOURNAL_DATA);
 582         CHECK_FLAG_VALUE(NOTAIL);
 583         CHECK_FLAG_VALUE(DIRSYNC);
 584         CHECK_FLAG_VALUE(TOPDIR);
 585         CHECK_FLAG_VALUE(HUGE_FILE);
 586         CHECK_FLAG_VALUE(EXTENTS);
 587         CHECK_FLAG_VALUE(VERITY);
 588         CHECK_FLAG_VALUE(EA_INODE);
 589         CHECK_FLAG_VALUE(INLINE_DATA);
 590         CHECK_FLAG_VALUE(PROJINHERIT);
 591         CHECK_FLAG_VALUE(CASEFOLD);
 592         CHECK_FLAG_VALUE(RESERVED);
 593 }
 594
 595 /* Used to pass group descriptor data when online resize is done */
 596 struct ext4_new_group_input {
 597         __u32 group;            /* Group number for this data */
 598         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 599         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 600         __u64 inode_table;      /* Absolute block number of inode table start */
 601         __u32 blocks_count;     /* Total number of blocks in this group */
 602         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 603         __u16 unused;
 604 };
 605
 606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 607 struct compat_ext4_new_group_input {
 608         u32 group;
 609         compat_u64 block_bitmap;
 610         compat_u64 inode_bitmap;
 611         compat_u64 inode_table;
 612         u32 blocks_count;
 613         u16 reserved_blocks;
 614         u16 unused;
 615 };
 616 #endif
 617
 618 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 619 struct ext4_new_group_data {
 620         __u32 group;
 621         __u64 block_bitmap;
 622         __u64 inode_bitmap;
 623         __u64 inode_table;
 624         __u32 blocks_count;
 625         __u16 reserved_blocks;
 626         __u16 mdata_blocks;
 627         __u32 free_clusters_count;
 628 };
 629
 630 /* Indexes used to index group tables in ext4_new_group_data */
 631 enum {
 632         BLOCK_BITMAP = 0,       /* block bitmap */
 633         INODE_BITMAP,           /* inode bitmap */
 634         INODE_TABLE,            /* inode tables */
 635         GROUP_TABLE_COUNT,
 636 };
 637
 638 /*
 639  * Flags used by ext4_map_blocks()
 640  */
 641         /* Allocate any needed blocks and/or convert an unwritten
 642            extent to be an initialized ext4 */
 643 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 644         /* Request the creation of an unwritten extent */
 645 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 646 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 647                                                  EXT4_GET_BLOCKS_CREATE)
 648         /* Caller is from the delayed allocation writeout path
 649          * finally doing the actual allocation of delayed blocks */
 650 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 651         /* caller is from the direct IO path, request to creation of an
 652         unwritten extents if not allocated, split the unwritten
 653         extent if blocks has been preallocated already*/
 654 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 655 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 656 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 657                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 658         /* Convert extent to initialized after IO complete */
 659 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 660                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 661         /* Eventual metadata allocation (due to growing extent tree)
 662          * should not fail, so try to use reserved blocks for that.*/
 663 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 664         /* Don't normalize allocation size (used for fallocate) */
 665 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 666         /* Convert written extents to unwritten */
 667 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 668         /* Write zeros to newly created written extents */
 669 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 670 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 671                                         EXT4_GET_BLOCKS_ZERO)
 672         /* Caller will submit data before dropping transaction handle. This
 673          * allows jbd2 to avoid submitting data before commit. */
 674 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 675
 676 /*
 677  * The bit position of these flags must not overlap with any of the
 678  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 679  * read_extent_tree_block(), ext4_split_extent_at(),
 680  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 681  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 682  * caching the extents when reading from the extent tree while a
 683  * truncate or punch hole operation is in progress.
 684  */
 685 #define EXT4_EX_NOCACHE                         0x40000000
 686 #define EXT4_EX_FORCE_CACHE                     0x20000000
 687 #define EXT4_EX_NOFAIL                          0x10000000
 688
 689 /*
 690  * Flags used by ext4_free_blocks
 691  */
 692 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 693 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 694 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 695 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 696 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 697 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 698 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 699
 700 /*
 701  * ioctl commands
 702  */
 703 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 704 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 705 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 706 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 707 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 708 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 709 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 710 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 711 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 712  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 713  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 714 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 715 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 716 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 717 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 718 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 719 /* ioctl codes 19--39 are reserved for fscrypt */
 720 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 721 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 722 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 723 #define EXT4_IOC_CHECKPOINT             _IOW('f', 43, __u32)
 724
 725 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 726
 727 /*
 728  * Flags for going down operation
 729  */
 730 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 731 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 732 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 733
 734 /*
 735  * Flags returned by EXT4_IOC_GETSTATE
 736  *
 737  * We only expose to userspace a subset of the state flags in
 738  * i_state_flags
 739  */
 740 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 741 #define EXT4_STATE_FLAG_NEW             0x00000002
 742 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 743 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 744
 745 /* flags for ioctl EXT4_IOC_CHECKPOINT */
 746 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD        0x1
 747 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT        0x2
 748 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN        0x4
 749 #define EXT4_IOC_CHECKPOINT_FLAG_VALID          (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
 750                                                 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
 751                                                 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
 752
 753 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 754 /*
 755  * ioctl commands in 32 bit emulation
 756  */
 757 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 758 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 759 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 760 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 761 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 762 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 763 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 764 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 765 #endif
 766
 767 /*
 768  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 769  * It indicates that the entry in extent status cache is for a hole.
 770  */
 771 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 772
 773 /* Max physical block we can address w/o extents */
 774 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 775
 776 /* Max logical block we can support */
 777 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 778
 779 /*
 780  * Structure of an inode on the disk
 781  */
 782 struct ext4_inode {
 783         __le16  i_mode;         /* File mode */
 784         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 785         __le32  i_size_lo;      /* Size in bytes */
 786         __le32  i_atime;        /* Access time */
 787         __le32  i_ctime;        /* Inode Change time */
 788         __le32  i_mtime;        /* Modification time */
 789         __le32  i_dtime;        /* Deletion Time */
 790         __le16  i_gid;          /* Low 16 bits of Group Id */
 791         __le16  i_links_count;  /* Links count */
 792         __le32  i_blocks_lo;    /* Blocks count */
 793         __le32  i_flags;        /* File flags */
 794         union {
 795                 struct {
 796                         __le32  l_i_version;
 797                 } linux1;
 798                 struct {
 799                         __u32  h_i_translator;
 800                 } hurd1;
 801                 struct {
 802                         __u32  m_i_reserved1;
 803                 } masix1;
 804         } osd1;                         /* OS dependent 1 */
 805         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 806         __le32  i_generation;   /* File version (for NFS) */
 807         __le32  i_file_acl_lo;  /* File ACL */
 808         __le32  i_size_high;
 809         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 810         union {
 811                 struct {
 812                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 813                         __le16  l_i_file_acl_high;
 814                         __le16  l_i_uid_high;   /* these 2 fields */
 815                         __le16  l_i_gid_high;   /* were reserved2[0] */
 816                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 817                         __le16  l_i_reserved;
 818                 } linux2;
 819                 struct {
 820                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 821                         __u16   h_i_mode_high;
 822                         __u16   h_i_uid_high;
 823                         __u16   h_i_gid_high;
 824                         __u32   h_i_author;
 825                 } hurd2;
 826                 struct {
 827                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 828                         __le16  m_i_file_acl_high;
 829                         __u32   m_i_reserved2[2];
 830                 } masix2;
 831         } osd2;                         /* OS dependent 2 */
 832         __le16  i_extra_isize;
 833         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 834         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 835         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 836         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 837         __le32  i_crtime;       /* File Creation time */
 838         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 839         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 840         __le32  i_projid;       /* Project ID */
 841 };
 842
 843 struct move_extent {
 844         __u32 reserved;         /* should be zero */
 845         __u32 donor_fd;         /* donor file descriptor */
 846         __u64 orig_start;       /* logical start offset in block for orig */
 847         __u64 donor_start;      /* logical start offset in block for donor */
 848         __u64 len;              /* block length to be moved */
 849         __u64 moved_len;        /* moved block length */
 850 };
 851
 852 #define EXT4_EPOCH_BITS 2
 853 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 854 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 855
 856 /*
 857  * Extended fields will fit into an inode if the filesystem was formatted
 858  * with large inodes (-I 256 or larger) and there are not currently any EAs
 859  * consuming all of the available space. For new inodes we always reserve
 860  * enough space for the kernel's known extended fields, but for inodes
 861  * created with an old kernel this might not have been the case. None of
 862  * the extended inode fields is critical for correct filesystem operation.
 863  * This macro checks if a certain field fits in the inode. Note that
 864  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 865  */
 866 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 867         ((offsetof(typeof(*ext4_inode), field) +        \
 868           sizeof((ext4_inode)->field))                  \
 869         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 870             (einode)->i_extra_isize))                   \
 871
 872 /*
 873  * We use an encoding that preserves the times for extra epoch "00":
 874  *
 875  * extra  msb of                         adjust for signed
 876  * epoch  32-bit                         32-bit tv_sec to
 877  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 878  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 879  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 880  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 881  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 882  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 883  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 884  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 885  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 886  *
 887  * Note that previous versions of the kernel on 64-bit systems would
 888  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 889  * 1970.  e2fsck will correct this, assuming that it is run on the
 890  * affected filesystem before 2242.
 891  */
 892
 893 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 894 {
 895         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 896         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 897 }
 898
 899 static inline void ext4_decode_extra_time(struct timespec64 *time,
 900                                           __le32 extra)
 901 {
 902         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 903                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 904         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 905 }
 906
 907 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 908 do {                                                                            \
 909         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 910                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 911                 (raw_inode)->xtime ## _extra =                                  \
 912                                 ext4_encode_extra_time(&(inode)->xtime);        \
 913                 }                                                               \
 914         else    \
 915                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 916 } while (0)
 917
 918 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 919 do {                                                                           \
 920         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 921                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 922         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 923                 (raw_inode)->xtime ## _extra =                                 \
 924                                 ext4_encode_extra_time(&(einode)->xtime);      \
 925 } while (0)
 926
 927 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 928 do {                                                                            \
 929         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 930         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 931                 ext4_decode_extra_time(&(inode)->xtime,                         \
 932                                        raw_inode->xtime ## _extra);             \
 933                 }                                                               \
 934         else                                                                    \
 935                 (inode)->xtime.tv_nsec = 0;                                     \
 936 } while (0)
 937
 938
 939 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 940 do {                                                                           \
 941         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 942                 (einode)->xtime.tv_sec =                                       \
 943                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 944         else                                                                   \
 945                 (einode)->xtime.tv_sec = 0;                                    \
 946         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 947                 ext4_decode_extra_time(&(einode)->xtime,                       \
 948                                        raw_inode->xtime ## _extra);            \
 949         else                                                                   \
 950                 (einode)->xtime.tv_nsec = 0;                                   \
 951 } while (0)
 952
 953 #define i_disk_version osd1.linux1.l_i_version
 954
 955 #if defined(__KERNEL__) || defined(__linux__)
 956 #define i_reserved1     osd1.linux1.l_i_reserved1
 957 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 958 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 959 #define i_uid_low       i_uid
 960 #define i_gid_low       i_gid
 961 #define i_uid_high      osd2.linux2.l_i_uid_high
 962 #define i_gid_high      osd2.linux2.l_i_gid_high
 963 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 964
 965 #elif defined(__GNU__)
 966
 967 #define i_translator    osd1.hurd1.h_i_translator
 968 #define i_uid_high      osd2.hurd2.h_i_uid_high
 969 #define i_gid_high      osd2.hurd2.h_i_gid_high
 970 #define i_author        osd2.hurd2.h_i_author
 971
 972 #elif defined(__masix__)
 973
 974 #define i_reserved1     osd1.masix1.m_i_reserved1
 975 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 976 #define i_reserved2     osd2.masix2.m_i_reserved2
 977
 978 #endif /* defined(__KERNEL__) || defined(__linux__) */
 979
 980 #include "extents_status.h"
 981 #include "fast_commit.h"
 982
 983 /*
 984  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 985  *
 986  * These are needed to avoid lockdep false positives when we need to
 987  * allocate blocks to the quota inode during ext4_map_blocks(), while
 988  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 989  * do quota tracking for the quota inode, this avoids deadlock (as
 990  * well as infinite recursion, since it isn't turtles all the way
 991  * down...)
 992  *
 993  *  I_DATA_SEM_NORMAL - Used for most inodes
 994  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 995  *                        where the second inode has larger inode number
 996  *                        than the first
 997  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 998  */
 999 enum {
1000         I_DATA_SEM_NORMAL = 0,
1001         I_DATA_SEM_OTHER,
1002         I_DATA_SEM_QUOTA,
1003 };
1004
1005
1006 /*
1007  * fourth extended file system inode data in memory
1008  */
1009 struct ext4_inode_info {
1010         __le32  i_data[15];     /* unconverted */
1011         __u32   i_dtime;
1012         ext4_fsblk_t    i_file_acl;
1013
1014         /*
1015          * i_block_group is the number of the block group which contains
1016          * this file's inode.  Constant across the lifetime of the inode,
1017          * it is used for making block allocation decisions - we try to
1018          * place a file's data blocks near its inode block, and new inodes
1019          * near to their parent directory's inode.
1020          */
1021         ext4_group_t    i_block_group;
1022         ext4_lblk_t     i_dir_start_lookup;
1023 #if (BITS_PER_LONG < 64)
1024         unsigned long   i_state_flags;          /* Dynamic state flags */
1025 #endif
1026         unsigned long   i_flags;
1027
1028         /*
1029          * Extended attributes can be read independently of the main file
1030          * data. Taking i_mutex even when reading would cause contention
1031          * between readers of EAs and writers of regular file data, so
1032          * instead we synchronize on xattr_sem when reading or changing
1033          * EAs.
1034          */
1035         struct rw_semaphore xattr_sem;
1036
1037         /*
1038          * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1039          * i_orphan is used.
1040          */
1041         union {
1042                 struct list_head i_orphan;      /* unlinked but open inodes */
1043                 unsigned int i_orphan_idx;      /* Index in orphan file */
1044         };
1045
1046         /* Fast commit related info */
1047
1048         struct list_head i_fc_list;     /*
1049                                          * inodes that need fast commit
1050                                          * protected by sbi->s_fc_lock.
1051                                          */
1052
1053         /* Start of lblk range that needs to be committed in this fast commit */
1054         ext4_lblk_t i_fc_lblk_start;
1055
1056         /* End of lblk range that needs to be committed in this fast commit */
1057         ext4_lblk_t i_fc_lblk_len;
1058
1059         /* Number of ongoing updates on this inode */
1060         atomic_t  i_fc_updates;
1061
1062         /* Fast commit wait queue for this inode */
1063         wait_queue_head_t i_fc_wait;
1064
1065         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1066         struct mutex i_fc_lock;
1067
1068         /*
1069          * i_disksize keeps track of what the inode size is ON DISK, not
1070          * in memory.  During truncate, i_size is set to the new size by
1071          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1072          * set i_disksize to 0 until the truncate is actually under way.
1073          *
1074          * The intent is that i_disksize always represents the blocks which
1075          * are used by this file.  This allows recovery to restart truncate
1076          * on orphans if we crash during truncate.  We actually write i_disksize
1077          * into the on-disk inode when writing inodes out, instead of i_size.
1078          *
1079          * The only time when i_disksize and i_size may be different is when
1080          * a truncate is in progress.  The only things which change i_disksize
1081          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1082          */
1083         loff_t  i_disksize;
1084
1085         /*
1086          * i_data_sem is for serialising ext4_truncate() against
1087          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1088          * data tree are chopped off during truncate. We can't do that in
1089          * ext4 because whenever we perform intermediate commits during
1090          * truncate, the inode and all the metadata blocks *must* be in a
1091          * consistent state which allows truncation of the orphans to restart
1092          * during recovery.  Hence we must fix the get_block-vs-truncate race
1093          * by other means, so we have i_data_sem.
1094          */
1095         struct rw_semaphore i_data_sem;
1096         struct inode vfs_inode;
1097         struct jbd2_inode *jinode;
1098
1099         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1100
1101         /*
1102          * File creation time. Its function is same as that of
1103          * struct timespec64 i_{a,c,m}time in the generic inode.
1104          */
1105         struct timespec64 i_crtime;
1106
1107         /* mballoc */
1108         atomic_t i_prealloc_active;
1109         struct list_head i_prealloc_list;
1110         spinlock_t i_prealloc_lock;
1111
1112         /* extents status tree */
1113         struct ext4_es_tree i_es_tree;
1114         rwlock_t i_es_lock;
1115         struct list_head i_es_list;
1116         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1117         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1118         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1119                                            extents to shrink. Protected by
1120                                            i_es_lock  */
1121
1122         /* ialloc */
1123         ext4_group_t    i_last_alloc_group;
1124
1125         /* allocation reservation info for delalloc */
1126         /* In case of bigalloc, this refer to clusters rather than blocks */
1127         unsigned int i_reserved_data_blocks;
1128
1129         /* pending cluster reservations for bigalloc file systems */
1130         struct ext4_pending_tree i_pending_tree;
1131
1132         /* on-disk additional length */
1133         __u16 i_extra_isize;
1134
1135         /* Indicate the inline data space. */
1136         u16 i_inline_off;
1137         u16 i_inline_size;
1138
1139 #ifdef CONFIG_QUOTA
1140         /* quota space reservation, managed internally by quota code */
1141         qsize_t i_reserved_quota;
1142 #endif
1143
1144         /* Lock protecting lists below */
1145         spinlock_t i_completed_io_lock;
1146         /*
1147          * Completed IOs that need unwritten extents handling and have
1148          * transaction reserved
1149          */
1150         struct list_head i_rsv_conversion_list;
1151         struct work_struct i_rsv_conversion_work;
1152         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1153
1154         spinlock_t i_block_reservation_lock;
1155
1156         /*
1157          * Transactions that contain inode's metadata needed to complete
1158          * fsync and fdatasync, respectively.
1159          */
1160         tid_t i_sync_tid;
1161         tid_t i_datasync_tid;
1162
1163 #ifdef CONFIG_QUOTA
1164         struct dquot *i_dquot[MAXQUOTAS];
1165 #endif
1166
1167         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1168         __u32 i_csum_seed;
1169
1170         kprojid_t i_projid;
1171 };
1172
1173 /*
1174  * File system states
1175  */
1176 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1177 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1178 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1179 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1180
1181 /*
1182  * Misc. filesystem flags
1183  */
1184 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1185 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1186 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1187
1188 /*
1189  * Mount flags set via mount options or defaults
1190  */
1191 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1192 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1193 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1194 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1195 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1196 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1197 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1198 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1199 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1200 #ifdef CONFIG_FS_DAX
1201 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1202 #else
1203 #define EXT4_MOUNT_DAX_ALWAYS           0
1204 #endif
1205 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1206 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1207 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1208 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1209 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1210 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1211 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1212 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1213 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1214 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1215 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1216 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1217                                                  * enable enforcement for hidden
1218                                                  * quota files */
1219 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1220                                                   * enforcement for hidden quota
1221                                                   * files */
1222 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1223                                                   * enforcement */
1224 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1225 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1226 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1227 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1228 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1229 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1230 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1231 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1232 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1233 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1234
1235 /*
1236  * Mount flags set either automatically (could not be set by mount option)
1237  * based on per file system feature or property or in special cases such as
1238  * distinguishing between explicit mount option definition and default.
1239  */
1240 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1241                                                       specified delalloc */
1242 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1243                                                       size of blocksize * 8
1244                                                       blocks */
1245 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1246                                                       file systems */
1247 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1248                                                 specified journal checksum */
1249
1250 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1251 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1252 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1253 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN    0x00000080 /* Optimize group
1254                                                     * scanning in mballoc
1255                                                     */
1256
1257 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1258                                                 ~EXT4_MOUNT_##opt
1259 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1260                                                 EXT4_MOUNT_##opt
1261 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1262                                          EXT4_MOUNT_##opt)
1263
1264 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1265                                                 ~EXT4_MOUNT2_##opt
1266 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1267                                                 EXT4_MOUNT2_##opt
1268 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1269                                          EXT4_MOUNT2_##opt)
1270
1271 #define ext4_test_and_set_bit           __test_and_set_bit_le
1272 #define ext4_set_bit                    __set_bit_le
1273 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1274 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1275 #define ext4_clear_bit                  __clear_bit_le
1276 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1277 #define ext4_test_bit                   test_bit_le
1278 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1279 #define ext4_find_next_bit              find_next_bit_le
1280
1281 extern void ext4_set_bits(void *bm, int cur, int len);
1282
1283 /*
1284  * Maximal mount counts between two filesystem checks
1285  */
1286 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1287 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1288
1289 /*
1290  * Behaviour when detecting errors
1291  */
1292 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1293 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1294 #define EXT4_ERRORS_PANIC               3       /* Panic */
1295 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1296
1297 /* Metadata checksum algorithm codes */
1298 #define EXT4_CRC32C_CHKSUM              1
1299
1300 /*
1301  * Structure of the super block
1302  */
1303 struct ext4_super_block {
1304 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1305         __le32  s_blocks_count_lo;      /* Blocks count */
1306         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1307         __le32  s_free_blocks_count_lo; /* Free blocks count */
1308 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1309         __le32  s_first_data_block;     /* First Data Block */
1310         __le32  s_log_block_size;       /* Block size */
1311         __le32  s_log_cluster_size;     /* Allocation cluster size */
1312 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1313         __le32  s_clusters_per_group;   /* # Clusters per group */
1314         __le32  s_inodes_per_group;     /* # Inodes per group */
1315         __le32  s_mtime;                /* Mount time */
1316 /*30*/  __le32  s_wtime;                /* Write time */
1317         __le16  s_mnt_count;            /* Mount count */
1318         __le16  s_max_mnt_count;        /* Maximal mount count */
1319         __le16  s_magic;                /* Magic signature */
1320         __le16  s_state;                /* File system state */
1321         __le16  s_errors;               /* Behaviour when detecting errors */
1322         __le16  s_minor_rev_level;      /* minor revision level */
1323 /*40*/  __le32  s_lastcheck;            /* time of last check */
1324         __le32  s_checkinterval;        /* max. time between checks */
1325         __le32  s_creator_os;           /* OS */
1326         __le32  s_rev_level;            /* Revision level */
1327 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1328         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1329         /*
1330          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1331          *
1332          * Note: the difference between the compatible feature set and
1333          * the incompatible feature set is that if there is a bit set
1334          * in the incompatible feature set that the kernel doesn't
1335          * know about, it should refuse to mount the filesystem.
1336          *
1337          * e2fsck's requirements are more strict; if it doesn't know
1338          * about a feature in either the compatible or incompatible
1339          * feature set, it must abort and not try to meddle with
1340          * things it doesn't understand...
1341          */
1342         __le32  s_first_ino;            /* First non-reserved inode */
1343         __le16  s_inode_size;           /* size of inode structure */
1344         __le16  s_block_group_nr;       /* block group # of this superblock */
1345         __le32  s_feature_compat;       /* compatible feature set */
1346 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1347         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1348 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1349 /*78*/  char    s_volume_name[16];      /* volume name */
1350 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1351 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1352         /*
1353          * Performance hints.  Directory preallocation should only
1354          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1355          */
1356         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1357         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1358         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1359         /*
1360          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1361          */
1362 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1363 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1364         __le32  s_journal_dev;          /* device number of journal file */
1365         __le32  s_last_orphan;          /* start of list of inodes to delete */
1366         __le32  s_hash_seed[4];         /* HTREE hash seed */
1367         __u8    s_def_hash_version;     /* Default hash version to use */
1368         __u8    s_jnl_backup_type;
1369         __le16  s_desc_size;            /* size of group descriptor */
1370 /*100*/ __le32  s_default_mount_opts;
1371         __le32  s_first_meta_bg;        /* First metablock block group */
1372         __le32  s_mkfs_time;            /* When the filesystem was created */
1373         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1374         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1375 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1376         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1377         __le32  s_free_blocks_count_hi; /* Free blocks count */
1378         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1379         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1380         __le32  s_flags;                /* Miscellaneous flags */
1381         __le16  s_raid_stride;          /* RAID stride */
1382         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1383         __le64  s_mmp_block;            /* Block for multi-mount protection */
1384         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1385         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1386         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1387         __u8    s_encryption_level;     /* versioning level for encryption */
1388         __u8    s_reserved_pad;         /* Padding to next 32bits */
1389         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1390         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1391         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1392         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1393                                               snapshot's future use */
1394         __le32  s_snapshot_list;        /* inode number of the head of the
1395                                            on-disk snapshot list */
1396 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1397         __le32  s_error_count;          /* number of fs errors */
1398         __le32  s_first_error_time;     /* first time an error happened */
1399         __le32  s_first_error_ino;      /* inode involved in first error */
1400         __le64  s_first_error_block;    /* block involved of first error */
1401         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1402         __le32  s_first_error_line;     /* line number where error happened */
1403         __le32  s_last_error_time;      /* most recent time of an error */
1404         __le32  s_last_error_ino;       /* inode involved in last error */
1405         __le32  s_last_error_line;      /* line number where error happened */
1406         __le64  s_last_error_block;     /* block involved of last error */
1407         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1408 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1409         __u8    s_mount_opts[64];
1410         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1411         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1412         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1413         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1414         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1415         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1416         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1417         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1418         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1419         __u8    s_wtime_hi;
1420         __u8    s_mtime_hi;
1421         __u8    s_mkfs_time_hi;
1422         __u8    s_lastcheck_hi;
1423         __u8    s_first_error_time_hi;
1424         __u8    s_last_error_time_hi;
1425         __u8    s_first_error_errcode;
1426         __u8    s_last_error_errcode;
1427         __le16  s_encoding;             /* Filename charset encoding */
1428         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1429         __le32  s_orphan_file_inum;     /* Inode for tracking orphan inodes */
1430         __le32  s_reserved[94];         /* Padding to the end of the block */
1431         __le32  s_checksum;             /* crc32c(superblock) */
1432 };
1433
1434 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1435
1436 #ifdef __KERNEL__
1437
1438 #ifdef CONFIG_FS_ENCRYPTION
1439 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1440 #else
1441 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1442 #endif
1443
1444 /* Number of quota types we support */
1445 #define EXT4_MAXQUOTAS 3
1446
1447 #define EXT4_ENC_UTF8_12_1      1
1448
1449 /* Types of ext4 journal triggers */
1450 enum ext4_journal_trigger_type {
1451         EXT4_JTR_ORPHAN_FILE,
1452         EXT4_JTR_NONE   /* This must be the last entry for indexing to work! */
1453 };
1454
1455 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1456
1457 struct ext4_journal_trigger {
1458         struct jbd2_buffer_trigger_type tr_triggers;
1459         struct super_block *sb;
1460 };
1461
1462 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1463                                 struct jbd2_buffer_trigger_type *trigger)
1464 {
1465         return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1466 }
1467
1468 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1469
1470 /* Structure at the tail of orphan block */
1471 struct ext4_orphan_block_tail {
1472         __le32 ob_magic;
1473         __le32 ob_checksum;
1474 };
1475
1476 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1477 {
1478         return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1479                         sizeof(u32);
1480 }
1481
1482 struct ext4_orphan_block {
1483         atomic_t ob_free_entries;       /* Number of free orphan entries in block */
1484         struct buffer_head *ob_bh;      /* Buffer for orphan block */
1485 };
1486
1487 /*
1488  * Info about orphan file.
1489  */
1490 struct ext4_orphan_info {
1491         int of_blocks;                  /* Number of orphan blocks in a file */
1492         __u32 of_csum_seed;             /* Checksum seed for orphan file */
1493         struct ext4_orphan_block *of_binfo;     /* Array with info about orphan
1494                                                  * file blocks */
1495 };
1496
1497 /*
1498  * fourth extended-fs super-block data in memory
1499  */
1500 struct ext4_sb_info {
1501         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1502         unsigned long s_inodes_per_block;/* Number of inodes per block */
1503         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1504         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1505         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1506         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1507         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1508         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1509         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1510         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1511         unsigned long s_overhead;  /* # of fs overhead clusters */
1512         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1513         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1514         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1515         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1516         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1517         struct buffer_head * __rcu *s_group_desc;
1518         unsigned int s_mount_opt;
1519         unsigned int s_mount_opt2;
1520         unsigned long s_mount_flags;
1521         unsigned int s_def_mount_opt;
1522         ext4_fsblk_t s_sb_block;
1523         atomic64_t s_resv_clusters;
1524         kuid_t s_resuid;
1525         kgid_t s_resgid;
1526         unsigned short s_mount_state;
1527         unsigned short s_pad;
1528         int s_addr_per_block_bits;
1529         int s_desc_per_block_bits;
1530         int s_inode_size;
1531         int s_first_ino;
1532         unsigned int s_inode_readahead_blks;
1533         unsigned int s_inode_goal;
1534         u32 s_hash_seed[4];
1535         int s_def_hash_version;
1536         int s_hash_unsigned;    /* 3 if hash should be unsigned, 0 if not */
1537         struct percpu_counter s_freeclusters_counter;
1538         struct percpu_counter s_freeinodes_counter;
1539         struct percpu_counter s_dirs_counter;
1540         struct percpu_counter s_dirtyclusters_counter;
1541         struct percpu_counter s_sra_exceeded_retry_limit;
1542         struct blockgroup_lock *s_blockgroup_lock;
1543         struct proc_dir_entry *s_proc;
1544         struct kobject s_kobj;
1545         struct completion s_kobj_unregister;
1546         struct super_block *s_sb;
1547         struct buffer_head *s_mmp_bh;
1548
1549         /* Journaling */
1550         struct journal_s *s_journal;
1551         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1552         struct mutex s_orphan_lock;     /* Protects on disk list changes */
1553         struct list_head s_orphan;      /* List of orphaned inodes in on disk
1554                                            list */
1555         struct ext4_orphan_info s_orphan_info;
1556         unsigned long s_commit_interval;
1557         u32 s_max_batch_time;
1558         u32 s_min_batch_time;
1559         struct block_device *s_journal_bdev;
1560 #ifdef CONFIG_QUOTA
1561         /* Names of quota files with journalled quota */
1562         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1563         int s_jquota_fmt;                       /* Format of quota to use */
1564 #endif
1565         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1566         struct ext4_system_blocks __rcu *s_system_blks;
1567
1568 #ifdef EXTENTS_STATS
1569         /* ext4 extents stats */
1570         unsigned long s_ext_min;
1571         unsigned long s_ext_max;
1572         unsigned long s_depth_max;
1573         spinlock_t s_ext_stats_lock;
1574         unsigned long s_ext_blocks;
1575         unsigned long s_ext_extents;
1576 #endif
1577
1578         /* for buddy allocator */
1579         struct ext4_group_info ** __rcu *s_group_info;
1580         struct inode *s_buddy_cache;
1581         spinlock_t s_md_lock;
1582         unsigned short *s_mb_offsets;
1583         unsigned int *s_mb_maxs;
1584         unsigned int s_group_info_size;
1585         unsigned int s_mb_free_pending;
1586         struct list_head s_freed_data_list;     /* List of blocks to be freed
1587                                                    after commit completed */
1588         struct list_head s_discard_list;
1589         struct work_struct s_discard_work;
1590         atomic_t s_retry_alloc_pending;
1591         struct rb_root s_mb_avg_fragment_size_root;
1592         rwlock_t s_mb_rb_lock;
1593         struct list_head *s_mb_largest_free_orders;
1594         rwlock_t *s_mb_largest_free_orders_locks;
1595
1596         /* tunables */
1597         unsigned long s_stripe;
1598         unsigned int s_mb_max_linear_groups;
1599         unsigned int s_mb_stream_request;
1600         unsigned int s_mb_max_to_scan;
1601         unsigned int s_mb_min_to_scan;
1602         unsigned int s_mb_stats;
1603         unsigned int s_mb_order2_reqs;
1604         unsigned int s_mb_group_prealloc;
1605         unsigned int s_mb_max_inode_prealloc;
1606         unsigned int s_max_dir_size_kb;
1607         /* where last allocation was done - for stream allocation */
1608         unsigned long s_mb_last_group;
1609         unsigned long s_mb_last_start;
1610         unsigned int s_mb_prefetch;
1611         unsigned int s_mb_prefetch_limit;
1612
1613         /* stats for buddy allocator */
1614         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1615         atomic_t s_bal_success; /* we found long enough chunks */
1616         atomic_t s_bal_allocated;       /* in blocks */
1617         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1618         atomic_t s_bal_groups_scanned;  /* number of groups scanned */
1619         atomic_t s_bal_goals;   /* goal hits */
1620         atomic_t s_bal_breaks;  /* too long searches */
1621         atomic_t s_bal_2orders; /* 2^order hits */
1622         atomic_t s_bal_cr0_bad_suggestions;
1623         atomic_t s_bal_cr1_bad_suggestions;
1624         atomic64_t s_bal_cX_groups_considered[4];
1625         atomic64_t s_bal_cX_hits[4];
1626         atomic64_t s_bal_cX_failed[4];          /* cX loop didn't find blocks */
1627         atomic_t s_mb_buddies_generated;        /* number of buddies generated */
1628         atomic64_t s_mb_generation_time;
1629         atomic_t s_mb_lost_chunks;
1630         atomic_t s_mb_preallocated;
1631         atomic_t s_mb_discarded;
1632         atomic_t s_lock_busy;
1633
1634         /* locality groups */
1635         struct ext4_locality_group __percpu *s_locality_groups;
1636
1637         /* for write statistics */
1638         unsigned long s_sectors_written_start;
1639         u64 s_kbytes_written;
1640
1641         /* the size of zero-out chunk */
1642         unsigned int s_extent_max_zeroout_kb;
1643
1644         unsigned int s_log_groups_per_flex;
1645         struct flex_groups * __rcu *s_flex_groups;
1646         ext4_group_t s_flex_groups_allocated;
1647
1648         /* workqueue for reserved extent conversions (buffered io) */
1649         struct workqueue_struct *rsv_conversion_wq;
1650
1651         /* timer for periodic error stats printing */
1652         struct timer_list s_err_report;
1653
1654         /* Lazy inode table initialization info */
1655         struct ext4_li_request *s_li_request;
1656         /* Wait multiplier for lazy initialization thread */
1657         unsigned int s_li_wait_mult;
1658
1659         /* Kernel thread for multiple mount protection */
1660         struct task_struct *s_mmp_tsk;
1661
1662         /* record the last minlen when FITRIM is called. */
1663         atomic_t s_last_trim_minblks;
1664
1665         /* Reference to checksum algorithm driver via cryptoapi */
1666         struct crypto_shash *s_chksum_driver;
1667
1668         /* Precomputed FS UUID checksum for seeding other checksums */
1669         __u32 s_csum_seed;
1670
1671         /* Reclaim extents from extent status tree */
1672         struct shrinker s_es_shrinker;
1673         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1674         long s_es_nr_inode;
1675         struct ext4_es_stats s_es_stats;
1676         struct mb_cache *s_ea_block_cache;
1677         struct mb_cache *s_ea_inode_cache;
1678         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1679
1680         /* Journal triggers for checksum computation */
1681         struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1682
1683         /* Ratelimit ext4 messages. */
1684         struct ratelimit_state s_err_ratelimit_state;
1685         struct ratelimit_state s_warning_ratelimit_state;
1686         struct ratelimit_state s_msg_ratelimit_state;
1687         atomic_t s_warning_count;
1688         atomic_t s_msg_count;
1689
1690         /* Encryption policy for '-o test_dummy_encryption' */
1691         struct fscrypt_dummy_policy s_dummy_enc_policy;
1692
1693         /*
1694          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1695          * or EXTENTS flag.
1696          */
1697         struct percpu_rw_semaphore s_writepages_rwsem;
1698         struct dax_device *s_daxdev;
1699 #ifdef CONFIG_EXT4_DEBUG
1700         unsigned long s_simulate_fail;
1701 #endif
1702         /* Record the errseq of the backing block device */
1703         errseq_t s_bdev_wb_err;
1704         spinlock_t s_bdev_wb_lock;
1705
1706         /* Information about errors that happened during this mount */
1707         spinlock_t s_error_lock;
1708         int s_add_error_count;
1709         int s_first_error_code;
1710         __u32 s_first_error_line;
1711         __u32 s_first_error_ino;
1712         __u64 s_first_error_block;
1713         const char *s_first_error_func;
1714         time64_t s_first_error_time;
1715         int s_last_error_code;
1716         __u32 s_last_error_line;
1717         __u32 s_last_error_ino;
1718         __u64 s_last_error_block;
1719         const char *s_last_error_func;
1720         time64_t s_last_error_time;
1721         /*
1722          * If we are in a context where we cannot update error information in
1723          * the on-disk superblock, we queue this work to do it.
1724          */
1725         struct work_struct s_error_work;
1726
1727         /* Ext4 fast commit stuff */
1728         atomic_t s_fc_subtid;
1729         atomic_t s_fc_ineligible_updates;
1730         /*
1731          * After commit starts, the main queue gets locked, and the further
1732          * updates get added in the staging queue.
1733          */
1734 #define FC_Q_MAIN       0
1735 #define FC_Q_STAGING    1
1736         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1737                                          * that have data changes in them.
1738                                          */
1739         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1740         unsigned int s_fc_bytes;
1741         /*
1742          * Main fast commit lock. This lock protects accesses to the
1743          * following fields:
1744          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1745          */
1746         spinlock_t s_fc_lock;
1747         struct buffer_head *s_fc_bh;
1748         struct ext4_fc_stats s_fc_stats;
1749         u64 s_fc_avg_commit_time;
1750 #ifdef CONFIG_EXT4_DEBUG
1751         int s_fc_debug_max_replay;
1752 #endif
1753         struct ext4_fc_replay_state s_fc_replay_state;
1754 };
1755
1756 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1757 {
1758         return sb->s_fs_info;
1759 }
1760 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1761 {
1762         return container_of(inode, struct ext4_inode_info, vfs_inode);
1763 }
1764
1765 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1766 {
1767         return ino == EXT4_ROOT_INO ||
1768                 (ino >= EXT4_FIRST_INO(sb) &&
1769                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1770 }
1771
1772 /*
1773  * Returns: sbi->field[index]
1774  * Used to access an array element from the following sbi fields which require
1775  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1776  * - s_group_desc
1777  * - s_group_info
1778  * - s_flex_group
1779  */
1780 #define sbi_array_rcu_deref(sbi, field, index)                             \
1781 ({                                                                         \
1782         typeof(*((sbi)->field)) _v;                                        \
1783         rcu_read_lock();                                                   \
1784         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1785         rcu_read_unlock();                                                 \
1786         _v;                                                                \
1787 })
1788
1789 /*
1790  * run-time mount flags
1791  */
1792 enum {
1793         EXT4_MF_MNTDIR_SAMPLED,
1794         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1795         EXT4_MF_FC_INELIGIBLE,  /* Fast commit ineligible */
1796         EXT4_MF_FC_COMMITTING   /* File system underoing a fast
1797                                  * commit.
1798                                  */
1799 };
1800
1801 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1802 {
1803         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1804 }
1805
1806 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1807 {
1808         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1809 }
1810
1811 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1812 {
1813         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1814 }
1815
1816
1817 /*
1818  * Simulate_fail codes
1819  */
1820 #define EXT4_SIM_BBITMAP_EIO    1
1821 #define EXT4_SIM_BBITMAP_CRC    2
1822 #define EXT4_SIM_IBITMAP_EIO    3
1823 #define EXT4_SIM_IBITMAP_CRC    4
1824 #define EXT4_SIM_INODE_EIO      5
1825 #define EXT4_SIM_INODE_CRC      6
1826 #define EXT4_SIM_DIRBLOCK_EIO   7
1827 #define EXT4_SIM_DIRBLOCK_CRC   8
1828
1829 static inline bool ext4_simulate_fail(struct super_block *sb,
1830                                      unsigned long code)
1831 {
1832 #ifdef CONFIG_EXT4_DEBUG
1833         struct ext4_sb_info *sbi = EXT4_SB(sb);
1834
1835         if (unlikely(sbi->s_simulate_fail == code)) {
1836                 sbi->s_simulate_fail = 0;
1837                 return true;
1838         }
1839 #endif
1840         return false;
1841 }
1842
1843 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1844                                          struct buffer_head *bh,
1845                                          unsigned long code)
1846 {
1847         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1848                 clear_buffer_uptodate(bh);
1849 }
1850
1851 /*
1852  * Error number codes for s_{first,last}_error_errno
1853  *
1854  * Linux errno numbers are architecture specific, so we need to translate
1855  * them into something which is architecture independent.   We don't define
1856  * codes for all errno's; just the ones which are most likely to be the cause
1857  * of an ext4_error() call.
1858  */
1859 #define EXT4_ERR_UNKNOWN         1
1860 #define EXT4_ERR_EIO             2
1861 #define EXT4_ERR_ENOMEM          3
1862 #define EXT4_ERR_EFSBADCRC       4
1863 #define EXT4_ERR_EFSCORRUPTED    5
1864 #define EXT4_ERR_ENOSPC          6
1865 #define EXT4_ERR_ENOKEY          7
1866 #define EXT4_ERR_EROFS           8
1867 #define EXT4_ERR_EFBIG           9
1868 #define EXT4_ERR_EEXIST         10
1869 #define EXT4_ERR_ERANGE         11
1870 #define EXT4_ERR_EOVERFLOW      12
1871 #define EXT4_ERR_EBUSY          13
1872 #define EXT4_ERR_ENOTDIR        14
1873 #define EXT4_ERR_ENOTEMPTY      15
1874 #define EXT4_ERR_ESHUTDOWN      16
1875 #define EXT4_ERR_EFAULT         17
1876
1877 /*
1878  * Inode dynamic state flags
1879  */
1880 enum {
1881         EXT4_STATE_JDATA,               /* journaled data exists */
1882         EXT4_STATE_NEW,                 /* inode is newly created */
1883         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1884         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1885         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1886         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1887         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1888         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1889         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1890         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1891         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1892         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1893         EXT4_STATE_ORPHAN_FILE,         /* Inode orphaned in orphan file */
1894 };
1895
1896 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1897 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1898 {                                                                       \
1899         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1900 }                                                                       \
1901 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1902 {                                                                       \
1903         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1904 }                                                                       \
1905 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1906 {                                                                       \
1907         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1908 }
1909
1910 /* Add these declarations here only so that these functions can be
1911  * found by name.  Otherwise, they are very hard to locate. */
1912 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1913 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1914 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1915 EXT4_INODE_BIT_FNS(flag, flags, 0)
1916
1917 /* Add these declarations here only so that these functions can be
1918  * found by name.  Otherwise, they are very hard to locate. */
1919 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1920 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1921 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1922 #if (BITS_PER_LONG < 64)
1923 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1924
1925 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1926 {
1927         (ei)->i_state_flags = 0;
1928 }
1929 #else
1930 EXT4_INODE_BIT_FNS(state, flags, 32)
1931
1932 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1933 {
1934         /* We depend on the fact that callers will set i_flags */
1935 }
1936 #endif
1937 #else
1938 /* Assume that user mode programs are passing in an ext4fs superblock, not
1939  * a kernel struct super_block.  This will allow us to call the feature-test
1940  * macros from user land. */
1941 #define EXT4_SB(sb)     (sb)
1942 #endif
1943
1944 static inline bool ext4_verity_in_progress(struct inode *inode)
1945 {
1946         return IS_ENABLED(CONFIG_FS_VERITY) &&
1947                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1948 }
1949
1950 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1951
1952 /*
1953  * Codes for operating systems
1954  */
1955 #define EXT4_OS_LINUX           0
1956 #define EXT4_OS_HURD            1
1957 #define EXT4_OS_MASIX           2
1958 #define EXT4_OS_FREEBSD         3
1959 #define EXT4_OS_LITES           4
1960
1961 /*
1962  * Revision levels
1963  */
1964 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1965 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1966
1967 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1968
1969 #define EXT4_GOOD_OLD_INODE_SIZE 128
1970
1971 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1972 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1973 #define EXT4_TIMESTAMP_MIN              S32_MIN
1974
1975 /*
1976  * Feature set definitions
1977  */
1978
1979 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1980 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1981 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1982 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1983 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1984 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1985 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1986 /*
1987  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1988  * incompatible only if fast commit blocks are present in the FS. Since we
1989  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1990  * incompatible. We also have a JBD2 incompat feature, which gets set when
1991  * there are fast commit blocks present in the journal.
1992  */
1993 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
1994 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1995 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE         0x1000  /* Orphan file exists */
1996
1997 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
1998 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
1999 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
2000 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2001 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
2002 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
2003 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
2004 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
2005 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
2006 /*
2007  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2008  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2009  * all other data structures' checksums.  However, the METADATA_CSUM and
2010  * GDT_CSUM bits are mutually exclusive.
2011  */
2012 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
2013 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
2014 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
2015 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
2016 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT   0x10000 /* Orphan file may be
2017                                                            non-empty */
2018
2019 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
2020 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
2021 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
2022 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
2023 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
2024 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
2025 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
2026 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2027 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
2028 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
2029 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
2030 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
2031 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
2032 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
2033 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
2034 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
2035
2036 extern void ext4_update_dynamic_rev(struct super_block *sb);
2037
2038 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2039 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2040 { \
2041         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2042                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2043 } \
2044 static inline void ext4_set_feature_##name(struct super_block *sb) \
2045 { \
2046         ext4_update_dynamic_rev(sb); \
2047         EXT4_SB(sb)->s_es->s_feature_compat |= \
2048                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2049 } \
2050 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2051 { \
2052         EXT4_SB(sb)->s_es->s_feature_compat &= \
2053                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2054 }
2055
2056 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2057 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2058 { \
2059         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2060                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2061 } \
2062 static inline void ext4_set_feature_##name(struct super_block *sb) \
2063 { \
2064         ext4_update_dynamic_rev(sb); \
2065         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2066                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2067 } \
2068 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2069 { \
2070         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2071                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2072 }
2073
2074 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2075 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2076 { \
2077         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2078                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2079 } \
2080 static inline void ext4_set_feature_##name(struct super_block *sb) \
2081 { \
2082         ext4_update_dynamic_rev(sb); \
2083         EXT4_SB(sb)->s_es->s_feature_incompat |= \
2084                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2085 } \
2086 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2087 { \
2088         EXT4_SB(sb)->s_es->s_feature_incompat &= \
2089                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2090 }
2091
2092 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
2093 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
2094 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
2095 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
2096 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
2097 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
2098 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
2099 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
2100 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
2101 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,          ORPHAN_FILE)
2102
2103 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
2104 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
2105 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,    ORPHAN_PRESENT)
2117
2118 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
2119 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
2120 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
2121 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2134
2135 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2136 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2137                                          EXT4_FEATURE_INCOMPAT_META_BG)
2138 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2139                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2140                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2141
2142 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2143 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2144                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2145                                          EXT4_FEATURE_INCOMPAT_META_BG)
2146 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2147                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2148                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2149
2150 #define EXT4_FEATURE_COMPAT_SUPP        (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2151                                          EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2152 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2153                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2154                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2155                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2156                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2157                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2158                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2159                                          EXT4_FEATURE_INCOMPAT_MMP | \
2160                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2161                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2162                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2163                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2164                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2165 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2166                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2167                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2168                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2169                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2170                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2171                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2172                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2173                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2174                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2175                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2176                                          EXT4_FEATURE_RO_COMPAT_VERITY |\
2177                                          EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2178
2179 #define EXTN_FEATURE_FUNCS(ver) \
2180 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2181 { \
2182         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2183                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2184 } \
2185 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2186 { \
2187         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2188                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2189 } \
2190 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2191 { \
2192         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2193                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2194 }
2195
2196 EXTN_FEATURE_FUNCS(2)
2197 EXTN_FEATURE_FUNCS(3)
2198 EXTN_FEATURE_FUNCS(4)
2199
2200 static inline bool ext4_has_compat_features(struct super_block *sb)
2201 {
2202         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2203 }
2204 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2205 {
2206         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2207 }
2208 static inline bool ext4_has_incompat_features(struct super_block *sb)
2209 {
2210         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2211 }
2212
2213 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2214
2215 /*
2216  * Superblock flags
2217  */
2218 #define EXT4_FLAGS_RESIZING     0
2219 #define EXT4_FLAGS_SHUTDOWN     1
2220 #define EXT4_FLAGS_BDEV_IS_DAX  2
2221
2222 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2223 {
2224         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2225 }
2226
2227 /*
2228  * Default values for user and/or group using reserved blocks
2229  */
2230 #define EXT4_DEF_RESUID         0
2231 #define EXT4_DEF_RESGID         0
2232
2233 /*
2234  * Default project ID
2235  */
2236 #define EXT4_DEF_PROJID         0
2237
2238 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2239
2240 /*
2241  * Default mount options
2242  */
2243 #define EXT4_DEFM_DEBUG         0x0001
2244 #define EXT4_DEFM_BSDGROUPS     0x0002
2245 #define EXT4_DEFM_XATTR_USER    0x0004
2246 #define EXT4_DEFM_ACL           0x0008
2247 #define EXT4_DEFM_UID16         0x0010
2248 #define EXT4_DEFM_JMODE         0x0060
2249 #define EXT4_DEFM_JMODE_DATA    0x0020
2250 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2251 #define EXT4_DEFM_JMODE_WBACK   0x0060
2252 #define EXT4_DEFM_NOBARRIER     0x0100
2253 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2254 #define EXT4_DEFM_DISCARD       0x0400
2255 #define EXT4_DEFM_NODELALLOC    0x0800
2256
2257 /*
2258  * Default journal batch times
2259  */
2260 #define EXT4_DEF_MIN_BATCH_TIME 0
2261 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2262
2263 /*
2264  * Minimum number of groups in a flexgroup before we separate out
2265  * directories into the first block group of a flexgroup
2266  */
2267 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2268
2269 /*
2270  * Structure of a directory entry
2271  */
2272 #define EXT4_NAME_LEN 255
2273
2274 struct ext4_dir_entry {
2275         __le32  inode;                  /* Inode number */
2276         __le16  rec_len;                /* Directory entry length */
2277         __le16  name_len;               /* Name length */
2278         char    name[EXT4_NAME_LEN];    /* File name */
2279 };
2280
2281
2282 /*
2283  * Encrypted Casefolded entries require saving the hash on disk. This structure
2284  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2285  * boundary.
2286  */
2287 struct ext4_dir_entry_hash {
2288         __le32 hash;
2289         __le32 minor_hash;
2290 };
2291
2292 /*
2293  * The new version of the directory entry.  Since EXT4 structures are
2294  * stored in intel byte order, and the name_len field could never be
2295  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2296  * file_type field.
2297  */
2298 struct ext4_dir_entry_2 {
2299         __le32  inode;                  /* Inode number */
2300         __le16  rec_len;                /* Directory entry length */
2301         __u8    name_len;               /* Name length */
2302         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2303         char    name[EXT4_NAME_LEN];    /* File name */
2304 };
2305
2306 /*
2307  * Access the hashes at the end of ext4_dir_entry_2
2308  */
2309 #define EXT4_DIRENT_HASHES(entry) \
2310         ((struct ext4_dir_entry_hash *) \
2311                 (((void *)(entry)) + \
2312                 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2313 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2314 #define EXT4_DIRENT_MINOR_HASH(entry) \
2315                 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2316
2317 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2318 {
2319         return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2320 }
2321
2322 /*
2323  * This is a bogus directory entry at the end of each leaf block that
2324  * records checksums.
2325  */
2326 struct ext4_dir_entry_tail {
2327         __le32  det_reserved_zero1;     /* Pretend to be unused */
2328         __le16  det_rec_len;            /* 12 */
2329         __u8    det_reserved_zero2;     /* Zero name length */
2330         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2331         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2332 };
2333
2334 #define EXT4_DIRENT_TAIL(block, blocksize) \
2335         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2336                                         ((blocksize) - \
2337                                          sizeof(struct ext4_dir_entry_tail))))
2338
2339 /*
2340  * Ext4 directory file types.  Only the low 3 bits are used.  The
2341  * other bits are reserved for now.
2342  */
2343 #define EXT4_FT_UNKNOWN         0
2344 #define EXT4_FT_REG_FILE        1
2345 #define EXT4_FT_DIR             2
2346 #define EXT4_FT_CHRDEV          3
2347 #define EXT4_FT_BLKDEV          4
2348 #define EXT4_FT_FIFO            5
2349 #define EXT4_FT_SOCK            6
2350 #define EXT4_FT_SYMLINK         7
2351
2352 #define EXT4_FT_MAX             8
2353
2354 #define EXT4_FT_DIR_CSUM        0xDE
2355
2356 /*
2357  * EXT4_DIR_PAD defines the directory entries boundaries
2358  *
2359  * NOTE: It must be a multiple of 4
2360  */
2361 #define EXT4_DIR_PAD                    4
2362 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2363 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2364
2365 /*
2366  * The rec_len is dependent on the type of directory. Directories that are
2367  * casefolded and encrypted need to store the hash as well, so we add room for
2368  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2369  * pass NULL for dir, as those entries do not use the extra fields.
2370  */
2371 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2372                                                 const struct inode *dir)
2373 {
2374         int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2375
2376         if (dir && ext4_hash_in_dirent(dir))
2377                 rec_len += sizeof(struct ext4_dir_entry_hash);
2378         return (rec_len & ~EXT4_DIR_ROUND);
2379 }
2380
2381 /*
2382  * If we ever get support for fs block sizes > page_size, we'll need
2383  * to remove the #if statements in the next two functions...
2384  */
2385 static inline unsigned int
2386 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2387 {
2388         unsigned len = le16_to_cpu(dlen);
2389
2390 #if (PAGE_SIZE >= 65536)
2391         if (len == EXT4_MAX_REC_LEN || len == 0)
2392                 return blocksize;
2393         return (len & 65532) | ((len & 3) << 16);
2394 #else
2395         return len;
2396 #endif
2397 }
2398
2399 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2400 {
2401         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2402                 BUG();
2403 #if (PAGE_SIZE >= 65536)
2404         if (len < 65536)
2405                 return cpu_to_le16(len);
2406         if (len == blocksize) {
2407                 if (blocksize == 65536)
2408                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2409                 else
2410                         return cpu_to_le16(0);
2411         }
2412         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2413 #else
2414         return cpu_to_le16(len);
2415 #endif
2416 }
2417
2418 /*
2419  * Hash Tree Directory indexing
2420  * (c) Daniel Phillips, 2001
2421  */
2422
2423 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2424                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2425 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2426                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2427 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2428
2429 /* Legal values for the dx_root hash_version field: */
2430
2431 #define DX_HASH_LEGACY                  0
2432 #define DX_HASH_HALF_MD4                1
2433 #define DX_HASH_TEA                     2
2434 #define DX_HASH_LEGACY_UNSIGNED         3
2435 #define DX_HASH_HALF_MD4_UNSIGNED       4
2436 #define DX_HASH_TEA_UNSIGNED            5
2437 #define DX_HASH_SIPHASH                 6
2438
2439 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2440                               const void *address, unsigned int length)
2441 {
2442         struct {
2443                 struct shash_desc shash;
2444                 char ctx[4];
2445         } desc;
2446
2447         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2448
2449         desc.shash.tfm = sbi->s_chksum_driver;
2450         *(u32 *)desc.ctx = crc;
2451
2452         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2453
2454         return *(u32 *)desc.ctx;
2455 }
2456
2457 #ifdef __KERNEL__
2458
2459 /* hash info structure used by the directory hash */
2460 struct dx_hash_info
2461 {
2462         u32             hash;
2463         u32             minor_hash;
2464         int             hash_version;
2465         u32             *seed;
2466 };
2467
2468
2469 /* 32 and 64 bit signed EOF for dx directories */
2470 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2471 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2472
2473
2474 /*
2475  * Control parameters used by ext4_htree_next_block
2476  */
2477 #define HASH_NB_ALWAYS          1
2478
2479 struct ext4_filename {
2480         const struct qstr *usr_fname;
2481         struct fscrypt_str disk_name;
2482         struct dx_hash_info hinfo;
2483 #ifdef CONFIG_FS_ENCRYPTION
2484         struct fscrypt_str crypto_buf;
2485 #endif
2486 #ifdef CONFIG_UNICODE
2487         struct fscrypt_str cf_name;
2488 #endif
2489 };
2490
2491 #define fname_name(p) ((p)->disk_name.name)
2492 #define fname_usr_name(p) ((p)->usr_fname->name)
2493 #define fname_len(p)  ((p)->disk_name.len)
2494
2495 /*
2496  * Describe an inode's exact location on disk and in memory
2497  */
2498 struct ext4_iloc
2499 {
2500         struct buffer_head *bh;
2501         unsigned long offset;
2502         ext4_group_t block_group;
2503 };
2504
2505 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2506 {
2507         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2508 }
2509
2510 static inline bool ext4_is_quota_file(struct inode *inode)
2511 {
2512         return IS_NOQUOTA(inode) &&
2513                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2514 }
2515
2516 /*
2517  * This structure is stuffed into the struct file's private_data field
2518  * for directories.  It is where we put information so that we can do
2519  * readdir operations in hash tree order.
2520  */
2521 struct dir_private_info {
2522         struct rb_root  root;
2523         struct rb_node  *curr_node;
2524         struct fname    *extra_fname;
2525         loff_t          last_pos;
2526         __u32           curr_hash;
2527         __u32           curr_minor_hash;
2528         __u32           next_hash;
2529 };
2530
2531 /* calculate the first block number of the group */
2532 static inline ext4_fsblk_t
2533 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2534 {
2535         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2536                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2537 }
2538
2539 /*
2540  * Special error return code only used by dx_probe() and its callers.
2541  */
2542 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2543
2544 /* htree levels for ext4 */
2545 #define EXT4_HTREE_LEVEL_COMPAT 2
2546 #define EXT4_HTREE_LEVEL        3
2547
2548 static inline int ext4_dir_htree_level(struct super_block *sb)
2549 {
2550         return ext4_has_feature_largedir(sb) ?
2551                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2552 }
2553
2554 /*
2555  * Timeout and state flag for lazy initialization inode thread.
2556  */
2557 #define EXT4_DEF_LI_WAIT_MULT                   10
2558 #define EXT4_DEF_LI_MAX_START_DELAY             5
2559 #define EXT4_LAZYINIT_QUIT                      0x0001
2560 #define EXT4_LAZYINIT_RUNNING                   0x0002
2561
2562 /*
2563  * Lazy inode table initialization info
2564  */
2565 struct ext4_lazy_init {
2566         unsigned long           li_state;
2567         struct list_head        li_request_list;
2568         struct mutex            li_list_mtx;
2569 };
2570
2571 enum ext4_li_mode {
2572         EXT4_LI_MODE_PREFETCH_BBITMAP,
2573         EXT4_LI_MODE_ITABLE,
2574 };
2575
2576 struct ext4_li_request {
2577         struct super_block      *lr_super;
2578         enum ext4_li_mode       lr_mode;
2579         ext4_group_t            lr_first_not_zeroed;
2580         ext4_group_t            lr_next_group;
2581         struct list_head        lr_request;
2582         unsigned long           lr_next_sched;
2583         unsigned long           lr_timeout;
2584 };
2585
2586 struct ext4_features {
2587         struct kobject f_kobj;
2588         struct completion f_kobj_unregister;
2589 };
2590
2591 /*
2592  * This structure will be used for multiple mount protection. It will be
2593  * written into the block number saved in the s_mmp_block field in the
2594  * superblock. Programs that check MMP should assume that if
2595  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2596  * to use the filesystem, regardless of how old the timestamp is.
2597  */
2598 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2599 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2600 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2601 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2602
2603 struct mmp_struct {
2604         __le32  mmp_magic;              /* Magic number for MMP */
2605         __le32  mmp_seq;                /* Sequence no. updated periodically */
2606
2607         /*
2608          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2609          * purposes and do not affect the correctness of the algorithm
2610          */
2611         __le64  mmp_time;               /* Time last updated */
2612         char    mmp_nodename[64];       /* Node which last updated MMP block */
2613         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2614
2615         /*
2616          * mmp_check_interval is used to verify if the MMP block has been
2617          * updated on the block device. The value is updated based on the
2618          * maximum time to write the MMP block during an update cycle.
2619          */
2620         __le16  mmp_check_interval;
2621
2622         __le16  mmp_pad1;
2623         __le32  mmp_pad2[226];
2624         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2625 };
2626
2627 /* arguments passed to the mmp thread */
2628 struct mmpd_data {
2629         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2630         struct super_block *sb;  /* super block of the fs */
2631 };
2632
2633 /*
2634  * Check interval multiplier
2635  * The MMP block is written every update interval and initially checked every
2636  * update interval x the multiplier (the value is then adapted based on the
2637  * write latency). The reason is that writes can be delayed under load and we
2638  * don't want readers to incorrectly assume that the filesystem is no longer
2639  * in use.
2640  */
2641 #define EXT4_MMP_CHECK_MULT             2UL
2642
2643 /*
2644  * Minimum interval for MMP checking in seconds.
2645  */
2646 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2647
2648 /*
2649  * Maximum interval for MMP checking in seconds.
2650  */
2651 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2652
2653 /*
2654  * Function prototypes
2655  */
2656
2657 /*
2658  * Ok, these declarations are also in <linux/kernel.h> but none of the
2659  * ext4 source programs needs to include it so they are duplicated here.
2660  */
2661 # define NORET_TYPE     /**/
2662 # define ATTRIB_NORET   __attribute__((noreturn))
2663 # define NORET_AND      noreturn,
2664
2665 /* bitmap.c */
2666 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2667 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2668                                 struct ext4_group_desc *gdp,
2669                                 struct buffer_head *bh, int sz);
2670 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2671                                   struct ext4_group_desc *gdp,
2672                                   struct buffer_head *bh, int sz);
2673 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2674                                 struct ext4_group_desc *gdp,
2675                                 struct buffer_head *bh);
2676 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2677                                   struct ext4_group_desc *gdp,
2678                                   struct buffer_head *bh);
2679
2680 /* balloc.c */
2681 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2682                                          ext4_fsblk_t blocknr,
2683                                          ext4_group_t *blockgrpp,
2684                                          ext4_grpblk_t *offsetp);
2685 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2686                                           ext4_fsblk_t block);
2687
2688 extern unsigned int ext4_block_group(struct super_block *sb,
2689                         ext4_fsblk_t blocknr);
2690 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2691                         ext4_fsblk_t blocknr);
2692 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2693 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2694                         ext4_group_t group);
2695 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2696                                          ext4_fsblk_t goal,
2697                                          unsigned int flags,
2698                                          unsigned long *count,
2699                                          int *errp);
2700 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2701                                     s64 nclusters, unsigned int flags);
2702 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2703 extern void ext4_check_blocks_bitmap(struct super_block *);
2704 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2705                                                     ext4_group_t block_group,
2706                                                     struct buffer_head ** bh);
2707 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2708
2709 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2710                                                 ext4_group_t block_group,
2711                                                 bool ignore_locked);
2712 extern int ext4_wait_block_bitmap(struct super_block *sb,
2713                                   ext4_group_t block_group,
2714                                   struct buffer_head *bh);
2715 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2716                                                   ext4_group_t block_group);
2717 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2718                                               ext4_group_t block_group,
2719                                               struct ext4_group_desc *gdp);
2720 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2721
2722 #ifdef CONFIG_UNICODE
2723 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2724                                          const struct qstr *iname,
2725                                          struct ext4_filename *fname);
2726 #endif
2727
2728 #ifdef CONFIG_FS_ENCRYPTION
2729 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2730                                                 const struct fscrypt_name *src)
2731 {
2732         memset(dst, 0, sizeof(*dst));
2733
2734         dst->usr_fname = src->usr_fname;
2735         dst->disk_name = src->disk_name;
2736         dst->hinfo.hash = src->hash;
2737         dst->hinfo.minor_hash = src->minor_hash;
2738         dst->crypto_buf = src->crypto_buf;
2739 }
2740
2741 static inline int ext4_fname_setup_filename(struct inode *dir,
2742                                             const struct qstr *iname,
2743                                             int lookup,
2744                                             struct ext4_filename *fname)
2745 {
2746         struct fscrypt_name name;
2747         int err;
2748
2749         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2750         if (err)
2751                 return err;
2752
2753         ext4_fname_from_fscrypt_name(fname, &name);
2754
2755 #ifdef CONFIG_UNICODE
2756         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2757 #endif
2758         return err;
2759 }
2760
2761 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2762                                             struct dentry *dentry,
2763                                             struct ext4_filename *fname)
2764 {
2765         struct fscrypt_name name;
2766         int err;
2767
2768         err = fscrypt_prepare_lookup(dir, dentry, &name);
2769         if (err)
2770                 return err;
2771
2772         ext4_fname_from_fscrypt_name(fname, &name);
2773
2774 #ifdef CONFIG_UNICODE
2775         err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname);
2776 #endif
2777         return err;
2778 }
2779
2780 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2781 {
2782         struct fscrypt_name name;
2783
2784         name.crypto_buf = fname->crypto_buf;
2785         fscrypt_free_filename(&name);
2786
2787         fname->crypto_buf.name = NULL;
2788         fname->usr_fname = NULL;
2789         fname->disk_name.name = NULL;
2790
2791 #ifdef CONFIG_UNICODE
2792         kfree(fname->cf_name.name);
2793         fname->cf_name.name = NULL;
2794 #endif
2795 }
2796 #else /* !CONFIG_FS_ENCRYPTION */
2797 static inline int ext4_fname_setup_filename(struct inode *dir,
2798                                             const struct qstr *iname,
2799                                             int lookup,
2800                                             struct ext4_filename *fname)
2801 {
2802         int err = 0;
2803         fname->usr_fname = iname;
2804         fname->disk_name.name = (unsigned char *) iname->name;
2805         fname->disk_name.len = iname->len;
2806
2807 #ifdef CONFIG_UNICODE
2808         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2809 #endif
2810
2811         return err;
2812 }
2813
2814 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2815                                             struct dentry *dentry,
2816                                             struct ext4_filename *fname)
2817 {
2818         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2819 }
2820
2821 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2822 {
2823 #ifdef CONFIG_UNICODE
2824         kfree(fname->cf_name.name);
2825         fname->cf_name.name = NULL;
2826 #endif
2827 }
2828 #endif /* !CONFIG_FS_ENCRYPTION */
2829
2830 /* dir.c */
2831 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2832                                   struct file *,
2833                                   struct ext4_dir_entry_2 *,
2834                                   struct buffer_head *, char *, int,
2835                                   unsigned int);
2836 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2837         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2838                                 (de), (bh), (buf), (size), (offset)))
2839 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2840                                 __u32 minor_hash,
2841                                 struct ext4_dir_entry_2 *dirent,
2842                                 struct fscrypt_str *ent_name);
2843 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2844 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2845                              struct buffer_head *bh,
2846                              void *buf, int buf_size,
2847                              struct ext4_filename *fname,
2848                              struct ext4_dir_entry_2 **dest_de);
2849 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2850                         struct ext4_dir_entry_2 *de,
2851                         int buf_size,
2852                         struct ext4_filename *fname);
2853 static inline void ext4_update_dx_flag(struct inode *inode)
2854 {
2855         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2856             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2857                 /* ext4_iget() should have caught this... */
2858                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2859                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2860         }
2861 }
2862 static const unsigned char ext4_filetype_table[] = {
2863         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2864 };
2865
2866 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2867 {
2868         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2869                 return DT_UNKNOWN;
2870
2871         return ext4_filetype_table[filetype];
2872 }
2873 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2874                              void *buf, int buf_size);
2875
2876 /* fsync.c */
2877 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2878
2879 /* hash.c */
2880 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2881                           struct dx_hash_info *hinfo);
2882
2883 /* ialloc.c */
2884 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2885 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2886                                       struct inode *, umode_t,
2887                                       const struct qstr *qstr, __u32 goal,
2888                                       uid_t *owner, __u32 i_flags,
2889                                       int handle_type, unsigned int line_no,
2890                                       int nblocks);
2891
2892 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2893         __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2894                          (goal), (owner), i_flags, 0, 0, 0)
2895 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2896                                     type, nblocks)                  \
2897         __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2898                          0, (type), __LINE__, (nblocks))
2899
2900
2901 extern void ext4_free_inode(handle_t *, struct inode *);
2902 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2903 extern unsigned long ext4_count_free_inodes(struct super_block *);
2904 extern unsigned long ext4_count_dirs(struct super_block *);
2905 extern void ext4_check_inodes_bitmap(struct super_block *);
2906 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2907 extern int ext4_init_inode_table(struct super_block *sb,
2908                                  ext4_group_t group, int barrier);
2909 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2910
2911 /* fast_commit.c */
2912 int ext4_fc_info_show(struct seq_file *seq, void *v);
2913 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2914 void ext4_fc_init_inode(struct inode *inode);
2915 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2916                          ext4_lblk_t end);
2917 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2918         struct dentry *dentry);
2919 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2920         struct dentry *dentry);
2921 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2922 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2923 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2924                             struct dentry *dentry);
2925 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2926 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2927 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2928 void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2929 void ext4_fc_stop_ineligible(struct super_block *sb);
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
2938 /* mballoc.c */
2939 extern const struct seq_operations ext4_mb_seq_groups_ops;
2940 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2941 extern long ext4_mb_stats;
2942 extern long ext4_mb_max_to_scan;
2943 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2944 extern int ext4_mb_init(struct super_block *);
2945 extern int ext4_mb_release(struct super_block *);
2946 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2947                                 struct ext4_allocation_request *, int *);
2948 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2949 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2950 extern int __init ext4_init_mballoc(void);
2951 extern void ext4_exit_mballoc(void);
2952 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2953                                      ext4_group_t group,
2954                                      unsigned int nr, int *cnt);
2955 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2956                                   unsigned int nr);
2957
2958 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2959                              struct buffer_head *bh, ext4_fsblk_t block,
2960                              unsigned long count, int flags);
2961 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2962                                    ext4_group_t ngroups);
2963 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2964                 ext4_group_t i, struct ext4_group_desc *desc);
2965 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2966                                 ext4_fsblk_t block, unsigned long count);
2967 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2968 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2969 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2970                        int len, int state);
2971
2972 /* inode.c */
2973 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2974                          struct ext4_inode_info *ei);
2975 int ext4_inode_is_fast_symlink(struct inode *inode);
2976 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2977 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2978 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2979                      bool wait, struct buffer_head **bhs);
2980 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2981                              struct buffer_head *bh_result, int create);
2982 int ext4_get_block(struct inode *inode, sector_t iblock,
2983                    struct buffer_head *bh_result, int create);
2984 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2985                            struct buffer_head *bh, int create);
2986 int ext4_walk_page_buffers(handle_t *handle,
2987                            struct inode *inode,
2988                            struct buffer_head *head,
2989                            unsigned from,
2990                            unsigned to,
2991                            int *partial,
2992                            int (*fn)(handle_t *handle, struct inode *inode,
2993                                      struct buffer_head *bh));
2994 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2995                                 struct buffer_head *bh);
2996 #define FALL_BACK_TO_NONDELALLOC 1
2997 #define CONVERT_INLINE_DATA      2
2998
2999 typedef enum {
3000         EXT4_IGET_NORMAL =      0,
3001         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
3002         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
3003 } ext4_iget_flags;
3004
3005 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
3006                                  ext4_iget_flags flags, const char *function,
3007                                  unsigned int line);
3008
3009 #define ext4_iget(sb, ino, flags) \
3010         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3011
3012 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
3013 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
3014                          struct iattr *);
3015 extern int  ext4_getattr(struct user_namespace *, const struct path *,
3016                          struct kstat *, u32, unsigned int);
3017 extern void ext4_evict_inode(struct inode *);
3018 extern void ext4_clear_inode(struct inode *);
3019 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
3020                               struct kstat *, u32, unsigned int);
3021 extern int  ext4_sync_inode(handle_t *, struct inode *);
3022 extern void ext4_dirty_inode(struct inode *, int);
3023 extern int ext4_change_inode_journal_flag(struct inode *, int);
3024 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3025 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3026                           struct ext4_iloc *iloc);
3027 extern int ext4_inode_attach_jinode(struct inode *inode);
3028 extern int ext4_can_truncate(struct inode *inode);
3029 extern int ext4_truncate(struct inode *);
3030 extern int ext4_break_layouts(struct inode *);
3031 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
3032 extern void ext4_set_inode_flags(struct inode *, bool init);
3033 extern int ext4_alloc_da_blocks(struct inode *inode);
3034 extern void ext4_set_aops(struct inode *inode);
3035 extern int ext4_writepage_trans_blocks(struct inode *);
3036 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3037 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3038                              loff_t lstart, loff_t lend);
3039 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3040 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3041 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3042 extern void ext4_da_release_space(struct inode *inode, int to_free);
3043 extern void ext4_da_update_reserve_space(struct inode *inode,
3044                                         int used, int quota_claim);
3045 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3046                               ext4_fsblk_t pblk, ext4_lblk_t len);
3047
3048 /* indirect.c */
3049 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3050                                 struct ext4_map_blocks *map, int flags);
3051 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3052 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3053 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3054                                  ext4_lblk_t start, ext4_lblk_t end);
3055
3056 /* ioctl.c */
3057 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3058 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3059 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3060                       struct dentry *dentry, struct fileattr *fa);
3061 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3062 extern void ext4_reset_inode_seed(struct inode *inode);
3063
3064 /* migrate.c */
3065 extern int ext4_ext_migrate(struct inode *);
3066 extern int ext4_ind_migrate(struct inode *inode);
3067
3068 /* namei.c */
3069 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3070                              struct inode *inode);
3071 extern int ext4_dirblock_csum_verify(struct inode *inode,
3072                                      struct buffer_head *bh);
3073 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3074                                 __u32 start_minor_hash, __u32 *next_hash);
3075 extern int ext4_search_dir(struct buffer_head *bh,
3076                            char *search_buf,
3077                            int buf_size,
3078                            struct inode *dir,
3079                            struct ext4_filename *fname,
3080                            unsigned int offset,
3081                            struct ext4_dir_entry_2 **res_dir);
3082 extern int ext4_generic_delete_entry(struct inode *dir,
3083                                      struct ext4_dir_entry_2 *de_del,
3084                                      struct buffer_head *bh,
3085                                      void *entry_buf,
3086                                      int buf_size,
3087                                      int csum_size);
3088 extern bool ext4_empty_dir(struct inode *inode);
3089
3090 /* resize.c */
3091 extern void ext4_kvfree_array_rcu(void *to_free);
3092 extern int ext4_group_add(struct super_block *sb,
3093                                 struct ext4_new_group_data *input);
3094 extern int ext4_group_extend(struct super_block *sb,
3095                                 struct ext4_super_block *es,
3096                                 ext4_fsblk_t n_blocks_count);
3097 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3098
3099 /* super.c */
3100 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3101                                          sector_t block, int op_flags);
3102 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3103                                                    sector_t block);
3104 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3105                                 bh_end_io_t *end_io);
3106 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3107                         bh_end_io_t *end_io);
3108 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3109 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3110 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3111 extern int ext4_calculate_overhead(struct super_block *sb);
3112 extern void ext4_superblock_csum_set(struct super_block *sb);
3113 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3114                                     ext4_group_t ngroup);
3115 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3116                                      char nbuf[16]);
3117 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3118                                              ext4_group_t block_group,
3119                                              unsigned int flags);
3120
3121 extern __printf(7, 8)
3122 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3123                   int, __u64, const char *, ...);
3124 extern __printf(6, 7)
3125 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3126                         ext4_fsblk_t, int, const char *, ...);
3127 extern __printf(5, 6)
3128 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3129                      const char *, ...);
3130 extern void __ext4_std_error(struct super_block *, const char *,
3131                              unsigned int, int);
3132 extern __printf(4, 5)
3133 void __ext4_warning(struct super_block *, const char *, unsigned int,
3134                     const char *, ...);
3135 extern __printf(4, 5)
3136 void __ext4_warning_inode(const struct inode *inode, const char *function,
3137                           unsigned int line, const char *fmt, ...);
3138 extern __printf(3, 4)
3139 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3140 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3141                            const char *, unsigned int, const char *);
3142 extern __printf(7, 8)
3143 void __ext4_grp_locked_error(const char *, unsigned int,
3144                              struct super_block *, ext4_group_t,
3145                              unsigned long, ext4_fsblk_t,
3146                              const char *, ...);
3147
3148 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3149         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3150
3151 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3152         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3153
3154 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3155         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3156                            (fmt), ## a)
3157
3158 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3159         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3160
3161 #define ext4_abort(sb, err, fmt, a...)                                  \
3162         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3163
3164 #ifdef CONFIG_PRINTK
3165
3166 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3167         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3168 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3169         __ext4_error_inode((inode), (func), (line), (block),            \
3170                            (err), (fmt), ##__VA_ARGS__)
3171 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3172         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3173 #define ext4_error(sb, fmt, ...)                                        \
3174         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3175                 ##__VA_ARGS__)
3176 #define ext4_error_err(sb, err, fmt, ...)                               \
3177         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3178                 ##__VA_ARGS__)
3179 #define ext4_warning(sb, fmt, ...)                                      \
3180         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3181 #define ext4_warning_inode(inode, fmt, ...)                             \
3182         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3183 #define ext4_msg(sb, level, fmt, ...)                           \
3184         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3185 #define dump_mmp_msg(sb, mmp, msg)                                      \
3186         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3187 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3188         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3189                                 fmt, ##__VA_ARGS__)
3190
3191 #else
3192
3193 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3194 do {                                                                    \
3195         no_printk(fmt, ##__VA_ARGS__);                                  \
3196         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3197 } while (0)
3198 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3199 do {                                                                    \
3200         no_printk(fmt, ##__VA_ARGS__);                                  \
3201         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3202 } while (0)
3203 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3204 do {                                                                    \
3205         no_printk(fmt, ##__VA_ARGS__);                                  \
3206         __ext4_error_file(file, "", 0, block, " ");                     \
3207 } while (0)
3208 #define ext4_error(sb, fmt, ...)                                        \
3209 do {                                                                    \
3210         no_printk(fmt, ##__VA_ARGS__);                                  \
3211         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3212 } while (0)
3213 #define ext4_error_err(sb, err, fmt, ...)                               \
3214 do {                                                                    \
3215         no_printk(fmt, ##__VA_ARGS__);                                  \
3216         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3217 } while (0)
3218 #define ext4_warning(sb, fmt, ...)                                      \
3219 do {                                                                    \
3220         no_printk(fmt, ##__VA_ARGS__);                                  \
3221         __ext4_warning(sb, "", 0, " ");                                 \
3222 } while (0)
3223 #define ext4_warning_inode(inode, fmt, ...)                             \
3224 do {                                                                    \
3225         no_printk(fmt, ##__VA_ARGS__);                                  \
3226         __ext4_warning_inode(inode, "", 0, " ");                        \
3227 } while (0)
3228 #define ext4_msg(sb, level, fmt, ...)                                   \
3229 do {                                                                    \
3230         no_printk(fmt, ##__VA_ARGS__);                                  \
3231         __ext4_msg(sb, "", " ");                                        \
3232 } while (0)
3233 #define dump_mmp_msg(sb, mmp, msg)                                      \
3234         __dump_mmp_msg(sb, mmp, "", 0, "")
3235 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3236 do {                                                                    \
3237         no_printk(fmt, ##__VA_ARGS__);                          \
3238         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3239 } while (0)
3240
3241 #endif
3242
3243 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3244                                       struct ext4_group_desc *bg);
3245 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3246                                       struct ext4_group_desc *bg);
3247 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3248                                      struct ext4_group_desc *bg);
3249 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3250                                       struct ext4_group_desc *bg);
3251 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3252                                  struct ext4_group_desc *bg);
3253 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3254                                 struct ext4_group_desc *bg);
3255 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3256                                    struct ext4_group_desc *bg);
3257 extern void ext4_block_bitmap_set(struct super_block *sb,
3258                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3259 extern void ext4_inode_bitmap_set(struct super_block *sb,
3260                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3261 extern void ext4_inode_table_set(struct super_block *sb,
3262                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3263 extern void ext4_free_group_clusters_set(struct super_block *sb,
3264                                          struct ext4_group_desc *bg,
3265                                          __u32 count);
3266 extern void ext4_free_inodes_set(struct super_block *sb,
3267                                 struct ext4_group_desc *bg, __u32 count);
3268 extern void ext4_used_dirs_set(struct super_block *sb,
3269                                 struct ext4_group_desc *bg, __u32 count);
3270 extern void ext4_itable_unused_set(struct super_block *sb,
3271                                    struct ext4_group_desc *bg, __u32 count);
3272 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3273                                        struct ext4_group_desc *gdp);
3274 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3275                                      struct ext4_group_desc *gdp);
3276 extern int ext4_register_li_request(struct super_block *sb,
3277                                     ext4_group_t first_not_zeroed);
3278
3279 static inline int ext4_has_metadata_csum(struct super_block *sb)
3280 {
3281         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3282                      !EXT4_SB(sb)->s_chksum_driver);
3283
3284         return ext4_has_feature_metadata_csum(sb) &&
3285                (EXT4_SB(sb)->s_chksum_driver != NULL);
3286 }
3287
3288 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3289 {
3290         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3291 }
3292
3293 #define ext4_read_incompat_64bit_val(es, name) \
3294         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3295                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3296                 le32_to_cpu(es->name##_lo))
3297
3298 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3299 {
3300         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3301 }
3302
3303 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3304 {
3305         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3306 }
3307
3308 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3309 {
3310         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3311 }
3312
3313 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3314                                          ext4_fsblk_t blk)
3315 {
3316         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3317         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3318 }
3319
3320 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3321                                               ext4_fsblk_t blk)
3322 {
3323         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3324         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3325 }
3326
3327 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3328                                            ext4_fsblk_t blk)
3329 {
3330         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3331         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3332 }
3333
3334 static inline loff_t ext4_isize(struct super_block *sb,
3335                                 struct ext4_inode *raw_inode)
3336 {
3337         if (ext4_has_feature_largedir(sb) ||
3338             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3339                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3340                         le32_to_cpu(raw_inode->i_size_lo);
3341
3342         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3343 }
3344
3345 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3346 {
3347         raw_inode->i_size_lo = cpu_to_le32(i_size);
3348         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3349 }
3350
3351 static inline
3352 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3353                                             ext4_group_t group)
3354 {
3355          struct ext4_group_info **grp_info;
3356          long indexv, indexh;
3357          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3358          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3359          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3360          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3361          return grp_info[indexh];
3362 }
3363
3364 /*
3365  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3366  * the locking protocol documented in the comments of ext4_group_add()
3367  * in resize.c
3368  */
3369 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3370 {
3371         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3372
3373         smp_rmb();
3374         return ngroups;
3375 }
3376
3377 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3378                                              ext4_group_t block_group)
3379 {
3380         return block_group >> sbi->s_log_groups_per_flex;
3381 }
3382
3383 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3384 {
3385         return 1 << sbi->s_log_groups_per_flex;
3386 }
3387
3388 #define ext4_std_error(sb, errno)                               \
3389 do {                                                            \
3390         if ((errno))                                            \
3391                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3392 } while (0)
3393
3394 #ifdef CONFIG_SMP
3395 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3396  * counters. So we need to make sure we have free clusters more
3397  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3398  */
3399 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3400 #else
3401 #define EXT4_FREECLUSTERS_WATERMARK 0
3402 #endif
3403
3404 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3405 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3406 {
3407         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3408                      !inode_is_locked(inode));
3409         down_write(&EXT4_I(inode)->i_data_sem);
3410         if (newsize > EXT4_I(inode)->i_disksize)
3411                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3412         up_write(&EXT4_I(inode)->i_data_sem);
3413 }
3414
3415 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3416 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3417 {
3418         int changed = 0;
3419
3420         if (newsize > inode->i_size) {
3421                 i_size_write(inode, newsize);
3422                 changed = 1;
3423         }
3424         if (newsize > EXT4_I(inode)->i_disksize) {
3425                 ext4_update_i_disksize(inode, newsize);
3426                 changed |= 2;
3427         }
3428         return changed;
3429 }
3430
3431 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3432                                       loff_t len);
3433
3434 struct ext4_group_info {
3435         unsigned long   bb_state;
3436 #ifdef AGGRESSIVE_CHECK
3437         unsigned long   bb_check_counter;
3438 #endif
3439         struct rb_root  bb_free_root;
3440         ext4_grpblk_t   bb_first_free;  /* first free block */
3441         ext4_grpblk_t   bb_free;        /* total free blocks */
3442         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3443         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3444         ext4_group_t    bb_group;       /* Group number */
3445         struct          list_head bb_prealloc_list;
3446 #ifdef DOUBLE_CHECK
3447         void            *bb_bitmap;
3448 #endif
3449         struct rw_semaphore alloc_sem;
3450         struct rb_node  bb_avg_fragment_size_rb;
3451         struct list_head bb_largest_free_order_node;
3452         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3453                                          * regions, index is order.
3454                                          * bb_counters[3] = 5 means
3455                                          * 5 free 8-block regions. */
3456 };
3457
3458 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3459 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3460 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3461 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3462 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3463         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3464 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3465         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3466 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3467
3468 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3469         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3470 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3471         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3472 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3473         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3474
3475 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3476         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3477 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3478         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3479 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3480         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3481 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3482         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3483
3484 #define EXT4_MAX_CONTENTION             8
3485 #define EXT4_CONTENTION_THRESHOLD       2
3486
3487 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3488                                               ext4_group_t group)
3489 {
3490         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3491 }
3492
3493 /*
3494  * Returns true if the filesystem is busy enough that attempts to
3495  * access the block group locks has run into contention.
3496  */
3497 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3498 {
3499         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3500 }
3501
3502 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3503 {
3504         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3505         if (spin_trylock(lock))
3506                 /*
3507                  * We're able to grab the lock right away, so drop the
3508                  * lock contention counter.
3509                  */
3510                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3511         else {
3512                 /*
3513                  * The lock is busy, so bump the contention counter,
3514                  * and then wait on the spin lock.
3515                  */
3516                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3517                                   EXT4_MAX_CONTENTION);
3518                 spin_lock(lock);
3519         }
3520 }
3521
3522 static inline void ext4_unlock_group(struct super_block *sb,
3523                                         ext4_group_t group)
3524 {
3525         spin_unlock(ext4_group_lock_ptr(sb, group));
3526 }
3527
3528 #ifdef CONFIG_QUOTA
3529 static inline bool ext4_quota_capable(struct super_block *sb)
3530 {
3531         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3532 }
3533
3534 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3535 {
3536         struct ext4_sb_info *sbi = EXT4_SB(sb);
3537
3538         return (ext4_has_feature_quota(sb) ||
3539                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3540 }
3541 int ext4_enable_quotas(struct super_block *sb);
3542 #endif
3543
3544 /*
3545  * Block validity checking
3546  */
3547 #define ext4_check_indirect_blockref(inode, bh)                         \
3548         ext4_check_blockref(__func__, __LINE__, inode,                  \
3549                             (__le32 *)(bh)->b_data,                     \
3550                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3551
3552 #define ext4_ind_check_inode(inode)                                     \
3553         ext4_check_blockref(__func__, __LINE__, inode,                  \
3554                             EXT4_I(inode)->i_data,                      \
3555                             EXT4_NDIR_BLOCKS)
3556
3557 /*
3558  * Inodes and files operations
3559  */
3560
3561 /* dir.c */
3562 extern const struct file_operations ext4_dir_operations;
3563
3564 /* file.c */
3565 extern const struct inode_operations ext4_file_inode_operations;
3566 extern const struct file_operations ext4_file_operations;
3567 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3568
3569 /* inline.c */
3570 extern int ext4_get_max_inline_size(struct inode *inode);
3571 extern int ext4_find_inline_data_nolock(struct inode *inode);
3572 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3573                                  unsigned int len);
3574 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3575
3576 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3577 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3578                                          struct inode *inode,
3579                                          loff_t pos, unsigned len,
3580                                          unsigned flags,
3581                                          struct page **pagep);
3582 extern int ext4_write_inline_data_end(struct inode *inode,
3583                                       loff_t pos, unsigned len,
3584                                       unsigned copied,
3585                                       struct page *page);
3586 extern struct buffer_head *
3587 ext4_journalled_write_inline_data(struct inode *inode,
3588                                   unsigned len,
3589                                   struct page *page);
3590 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3591                                            struct inode *inode,
3592                                            loff_t pos, unsigned len,
3593                                            unsigned flags,
3594                                            struct page **pagep,
3595                                            void **fsdata);
3596 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3597                                          unsigned len, unsigned copied,
3598                                          struct page *page);
3599 extern int ext4_try_add_inline_entry(handle_t *handle,
3600                                      struct ext4_filename *fname,
3601                                      struct inode *dir, struct inode *inode);
3602 extern int ext4_try_create_inline_dir(handle_t *handle,
3603                                       struct inode *parent,
3604                                       struct inode *inode);
3605 extern int ext4_read_inline_dir(struct file *filp,
3606                                 struct dir_context *ctx,
3607                                 int *has_inline_data);
3608 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3609                                   struct inode *dir, ext4_lblk_t block,
3610                                   struct dx_hash_info *hinfo,
3611                                   __u32 start_hash, __u32 start_minor_hash,
3612                                   int *has_inline_data);
3613 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3614                                         struct ext4_filename *fname,
3615                                         struct ext4_dir_entry_2 **res_dir,
3616                                         int *has_inline_data);
3617 extern int ext4_delete_inline_entry(handle_t *handle,
3618                                     struct inode *dir,
3619                                     struct ext4_dir_entry_2 *de_del,
3620                                     struct buffer_head *bh,
3621                                     int *has_inline_data);
3622 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3623 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3624                                         struct ext4_dir_entry_2 **parent_de,
3625                                         int *retval);
3626 extern int ext4_inline_data_fiemap(struct inode *inode,
3627                                    struct fiemap_extent_info *fieinfo,
3628                                    int *has_inline, __u64 start, __u64 len);
3629
3630 struct iomap;
3631 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3632
3633 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3634
3635 extern int ext4_convert_inline_data(struct inode *inode);
3636
3637 static inline int ext4_has_inline_data(struct inode *inode)
3638 {
3639         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3640                EXT4_I(inode)->i_inline_off;
3641 }
3642
3643 /* namei.c */
3644 extern const struct inode_operations ext4_dir_inode_operations;
3645 extern const struct inode_operations ext4_special_inode_operations;
3646 extern struct dentry *ext4_get_parent(struct dentry *child);
3647 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3648                                  struct ext4_dir_entry_2 *de,
3649                                  int blocksize, int csum_size,
3650                                  unsigned int parent_ino, int dotdot_real_len);
3651 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3652                                         unsigned int blocksize);
3653 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3654                                       struct buffer_head *bh);
3655 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3656                          struct inode *inode);
3657 extern int __ext4_link(struct inode *dir, struct inode *inode,
3658                        struct dentry *dentry);
3659
3660 #define S_SHIFT 12
3661 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3662         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3663         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3664         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3665         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3666         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3667         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3668         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3669 };
3670
3671 static inline void ext4_set_de_type(struct super_block *sb,
3672                                 struct ext4_dir_entry_2 *de,
3673                                 umode_t mode) {
3674         if (ext4_has_feature_filetype(sb))
3675                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3676 }
3677
3678 /* readpages.c */
3679 extern int ext4_mpage_readpages(struct inode *inode,
3680                 struct readahead_control *rac, struct page *page);
3681 extern int __init ext4_init_post_read_processing(void);
3682 extern void ext4_exit_post_read_processing(void);
3683
3684 /* symlink.c */
3685 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3686 extern const struct inode_operations ext4_symlink_inode_operations;
3687 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3688
3689 /* sysfs.c */
3690 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3691 extern int ext4_register_sysfs(struct super_block *sb);
3692 extern void ext4_unregister_sysfs(struct super_block *sb);
3693 extern int __init ext4_init_sysfs(void);
3694 extern void ext4_exit_sysfs(void);
3695
3696 /* block_validity */
3697 extern void ext4_release_system_zone(struct super_block *sb);
3698 extern int ext4_setup_system_zone(struct super_block *sb);
3699 extern int __init ext4_init_system_zone(void);
3700 extern void ext4_exit_system_zone(void);
3701 extern int ext4_inode_block_valid(struct inode *inode,
3702                                   ext4_fsblk_t start_blk,
3703                                   unsigned int count);
3704 extern int ext4_check_blockref(const char *, unsigned int,
3705                                struct inode *, __le32 *, unsigned int);
3706
3707 /* extents.c */
3708 struct ext4_ext_path;
3709 struct ext4_extent;
3710
3711 /*
3712  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3713  * __le32.
3714  */
3715 #define EXT_MAX_BLOCKS  0xffffffff
3716
3717 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3718 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3719 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3720                                struct ext4_map_blocks *map, int flags);
3721 extern int ext4_ext_truncate(handle_t *, struct inode *);
3722 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3723                                  ext4_lblk_t end);
3724 extern void ext4_ext_init(struct super_block *);
3725 extern void ext4_ext_release(struct super_block *);
3726 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3727                           loff_t len);
3728 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3729                                           loff_t offset, ssize_t len);
3730 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3731                                              ext4_io_end_t *io_end);
3732 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3733                            struct ext4_map_blocks *map, int flags);
3734 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3735                                                    int num,
3736                                                    struct ext4_ext_path *path);
3737 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3738                                   struct ext4_ext_path **,
3739                                   struct ext4_extent *, int);
3740 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3741                                               struct ext4_ext_path **,
3742                                               int flags);
3743 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3744 extern int ext4_ext_check_inode(struct inode *inode);
3745 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3746 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3747                         __u64 start, __u64 len);
3748 extern int ext4_get_es_cache(struct inode *inode,
3749                              struct fiemap_extent_info *fieinfo,
3750                              __u64 start, __u64 len);
3751 extern int ext4_ext_precache(struct inode *inode);
3752 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3753                                 struct inode *inode2, ext4_lblk_t lblk1,
3754                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3755                              int mark_unwritten,int *err);
3756 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3757 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3758                                        int check_cred, int restart_cred,
3759                                        int revoke_cred);
3760 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3761 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3762 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3763                 int len, int unwritten, ext4_fsblk_t pblk);
3764 extern int ext4_ext_clear_bb(struct inode *inode);
3765
3766
3767 /* move_extent.c */
3768 extern void ext4_double_down_write_data_sem(struct inode *first,
3769                                             struct inode *second);
3770 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3771                                           struct inode *donor_inode);
3772 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3773                              __u64 start_orig, __u64 start_donor,
3774                              __u64 len, __u64 *moved_len);
3775
3776 /* page-io.c */
3777 extern int __init ext4_init_pageio(void);
3778 extern void ext4_exit_pageio(void);
3779 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3780 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3781 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3782 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3783 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3784                                 struct writeback_control *wbc);
3785 extern void ext4_end_io_rsv_work(struct work_struct *work);
3786 extern void ext4_io_submit(struct ext4_io_submit *io);
3787 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3788                                struct page *page,
3789                                int len,
3790                                bool keep_towrite);
3791 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3792 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3793
3794 /* mmp.c */
3795 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3796
3797 /* mmp.c */
3798 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3799
3800 /* verity.c */
3801 extern const struct fsverity_operations ext4_verityops;
3802
3803 /* orphan.c */
3804 extern int ext4_orphan_add(handle_t *, struct inode *);
3805 extern int ext4_orphan_del(handle_t *, struct inode *);
3806 extern void ext4_orphan_cleanup(struct super_block *sb,
3807                                 struct ext4_super_block *es);
3808 extern void ext4_release_orphan_info(struct super_block *sb);
3809 extern int ext4_init_orphan_info(struct super_block *sb);
3810 extern int ext4_orphan_file_empty(struct super_block *sb);
3811 extern void ext4_orphan_file_block_trigger(
3812                                 struct jbd2_buffer_trigger_type *triggers,
3813                                 struct buffer_head *bh,
3814                                 void *data, size_t size);
3815
3816 /*
3817  * Add new method to test whether block and inode bitmaps are properly
3818  * initialized. With uninit_bg reading the block from disk is not enough
3819  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3820  */
3821 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3822
3823 static inline int bitmap_uptodate(struct buffer_head *bh)
3824 {
3825         return (buffer_uptodate(bh) &&
3826                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3827 }
3828 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3829 {
3830         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3831 }
3832
3833 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3834
3835 /* For ioend & aio unwritten conversion wait queues */
3836 #define EXT4_WQ_HASH_SZ         37
3837 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3838                                             EXT4_WQ_HASH_SZ])
3839 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3840
3841 extern int ext4_resize_begin(struct super_block *sb);
3842 extern void ext4_resize_end(struct super_block *sb);
3843
3844 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3845                                               struct ext4_io_end *io_end)
3846 {
3847         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3848                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3849                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3850         }
3851 }
3852
3853 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3854 {
3855         struct inode *inode = io_end->inode;
3856
3857         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3858                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3859                 /* Wake up anyone waiting on unwritten extent conversion */
3860                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3861                         wake_up_all(ext4_ioend_wq(inode));
3862         }
3863 }
3864
3865 extern const struct iomap_ops ext4_iomap_ops;
3866 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3867 extern const struct iomap_ops ext4_iomap_report_ops;
3868
3869 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3870 {
3871         /*
3872          * If the buffer has the write error flag, we have failed
3873          * to write out data in the block.  In this  case, we don't
3874          * have to read the block because we may read the old data
3875          * successfully.
3876          */
3877         if (buffer_write_io_error(bh))
3878                 set_buffer_uptodate(bh);
3879         return buffer_uptodate(bh);
3880 }
3881
3882 #endif  /* __KERNEL__ */
3883
3884 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3885 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3886
3887 #endif  /* _EXT4_H */