fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/refcount.h>
  21 #include <linux/types.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/magic.h>
  24 #include <linux/jbd2.h>
  25 #include <linux/quota.h>
  26 #include <linux/rwsem.h>
  27 #include <linux/rbtree.h>
  28 #include <linux/seqlock.h>
  29 #include <linux/mutex.h>
  30 #include <linux/timer.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #include <linux/fiemap.h>
  40 #ifdef __KERNEL__
  41 #include <linux/compat.h>
  42 #endif
  43
  44 #include <linux/fscrypt.h>
  45 #include <linux/fsverity.h>
  46
  47 #include <linux/compiler.h>
  48
  49 /*
  50  * The fourth extended filesystem constants/structures
  51  */
  52
  53 /*
  54  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  55  * structures. these checks slow things down a lot
  56  */
  57 #define AGGRESSIVE_CHECK__
  58
  59 /*
  60  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  61  * bitmaps, maintains and uses them to check for double allocations
  62  */
  63 #define DOUBLE_CHECK__
  64
  65 /*
  66  * Define EXT4FS_DEBUG to produce debug messages
  67  */
  68 #undef EXT4FS_DEBUG
  69
  70 /*
  71  * Debug code
  72  */
  73 #ifdef EXT4FS_DEBUG
  74 #define ext4_debug(f, a...)                                             \
  75         do {                                                            \
  76                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  77                         __FILE__, __LINE__, __func__);                  \
  78                 printk(KERN_DEBUG f, ## a);                             \
  79         } while (0)
  80 #else
  81 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  82 #endif
  83
  84  /*
  85   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  86   */
  87 #define EXT_DEBUG__
  88
  89 /*
  90  * Dynamic printk for controlled extents debugging.
  91  */
  92 #ifdef CONFIG_EXT4_DEBUG
  93 #define ext_debug(ino, fmt, ...)                                        \
  94         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  95                  current->comm, task_pid_nr(current),                   \
  96                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  97                  __func__, ##__VA_ARGS__)
  98 #else
  99 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
 100 #endif
 101
 102 #define ASSERT(assert)                                          \
 103 do {                                                                    \
 104         if (unlikely(!(assert))) {                                      \
 105                 printk(KERN_EMERG                                       \
 106                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 107                        __func__, __FILE__, __LINE__, #assert);          \
 108                 BUG();                                                  \
 109         }                                                               \
 110 } while (0)
 111
 112 /* data type for block offset of block group */
 113 typedef int ext4_grpblk_t;
 114
 115 /* data type for filesystem-wide blocks number */
 116 typedef unsigned long long ext4_fsblk_t;
 117
 118 /* data type for file logical block number */
 119 typedef __u32 ext4_lblk_t;
 120
 121 /* data type for block group number */
 122 typedef unsigned int ext4_group_t;
 123
 124 enum SHIFT_DIRECTION {
 125         SHIFT_LEFT = 0,
 126         SHIFT_RIGHT,
 127 };
 128
 129 /*
 130  * Flags used in mballoc's allocation_context flags field.
 131  *
 132  * Also used to show what's going on for debugging purposes when the
 133  * flag field is exported via the traceport interface
 134  */
 135
 136 /* prefer goal again. length */
 137 #define EXT4_MB_HINT_MERGE              0x0001
 138 /* blocks already reserved */
 139 #define EXT4_MB_HINT_RESERVED           0x0002
 140 /* metadata is being allocated */
 141 #define EXT4_MB_HINT_METADATA           0x0004
 142 /* first blocks in the file */
 143 #define EXT4_MB_HINT_FIRST              0x0008
 144 /* search for the best chunk */
 145 #define EXT4_MB_HINT_BEST               0x0010
 146 /* data is being allocated */
 147 #define EXT4_MB_HINT_DATA               0x0020
 148 /* don't preallocate (for tails) */
 149 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 150 /* allocate for locality group */
 151 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 152 /* allocate goal blocks or none */
 153 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 154 /* goal is meaningful */
 155 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 156 /* blocks already pre-reserved by delayed allocation */
 157 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 158 /* We are doing stream allocation */
 159 #define EXT4_MB_STREAM_ALLOC            0x0800
 160 /* Use reserved root blocks if needed */
 161 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 162 /* Use blocks from reserved pool */
 163 #define EXT4_MB_USE_RESERVED            0x2000
 164 /* Do strict check for free blocks while retrying block allocation */
 165 #define EXT4_MB_STRICT_CHECK            0x4000
 166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
 167 #define EXT4_MB_CR0_OPTIMIZED           0x8000
 168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
 169 #define EXT4_MB_CR1_OPTIMIZED           0x00010000
 170 /* Perform linear traversal for one group */
 171 #define EXT4_MB_SEARCH_NEXT_LINEAR      0x00020000
 172 struct ext4_allocation_request {
 173         /* target inode for block we're allocating */
 174         struct inode *inode;
 175         /* how many blocks we want to allocate */
 176         unsigned int len;
 177         /* logical block in target inode */
 178         ext4_lblk_t logical;
 179         /* the closest logical allocated block to the left */
 180         ext4_lblk_t lleft;
 181         /* the closest logical allocated block to the right */
 182         ext4_lblk_t lright;
 183         /* phys. target (a hint) */
 184         ext4_fsblk_t goal;
 185         /* phys. block for the closest logical allocated block to the left */
 186         ext4_fsblk_t pleft;
 187         /* phys. block for the closest logical allocated block to the right */
 188         ext4_fsblk_t pright;
 189         /* flags. see above EXT4_MB_HINT_* */
 190         unsigned int flags;
 191 };
 192
 193 /*
 194  * Logical to physical block mapping, used by ext4_map_blocks()
 195  *
 196  * This structure is used to pass requests into ext4_map_blocks() as
 197  * well as to store the information returned by ext4_map_blocks().  It
 198  * takes less room on the stack than a struct buffer_head.
 199  */
 200 #define EXT4_MAP_NEW            BIT(BH_New)
 201 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 202 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 203 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 204 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 205                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 206
 207 struct ext4_map_blocks {
 208         ext4_fsblk_t m_pblk;
 209         ext4_lblk_t m_lblk;
 210         unsigned int m_len;
 211         unsigned int m_flags;
 212 };
 213
 214 /*
 215  * Block validity checking, system zone rbtree.
 216  */
 217 struct ext4_system_blocks {
 218         struct rb_root root;
 219         struct rcu_head rcu;
 220 };
 221
 222 /*
 223  * Flags for ext4_io_end->flags
 224  */
 225 #define EXT4_IO_END_UNWRITTEN   0x0001
 226
 227 struct ext4_io_end_vec {
 228         struct list_head list;          /* list of io_end_vec */
 229         loff_t offset;                  /* offset in the file */
 230         ssize_t size;                   /* size of the extent */
 231 };
 232
 233 /*
 234  * For converting unwritten extents on a work queue. 'handle' is used for
 235  * buffered writeback.
 236  */
 237 typedef struct ext4_io_end {
 238         struct list_head        list;           /* per-file finished IO list */
 239         handle_t                *handle;        /* handle reserved for extent
 240                                                  * conversion */
 241         struct inode            *inode;         /* file being written to */
 242         struct bio              *bio;           /* Linked list of completed
 243                                                  * bios covering the extent */
 244         unsigned int            flag;           /* unwritten or not */
 245         refcount_t              count;          /* reference counter */
 246         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 247 } ext4_io_end_t;
 248
 249 struct ext4_io_submit {
 250         struct writeback_control *io_wbc;
 251         struct bio              *io_bio;
 252         ext4_io_end_t           *io_end;
 253         sector_t                io_next_block;
 254 };
 255
 256 /*
 257  * Special inodes numbers
 258  */
 259 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 260 #define EXT4_ROOT_INO            2      /* Root inode */
 261 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 262 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 263 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 264 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 265 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 266 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 267
 268 /* First non-reserved inode for old ext4 filesystems */
 269 #define EXT4_GOOD_OLD_FIRST_INO 11
 270
 271 /*
 272  * Maximal count of links to a file
 273  */
 274 #define EXT4_LINK_MAX           65000
 275
 276 /*
 277  * Macro-instructions used to manage several block sizes
 278  */
 279 #define EXT4_MIN_BLOCK_SIZE             1024
 280 #define EXT4_MAX_BLOCK_SIZE             65536
 281 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 282 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 283 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 284 #ifdef __KERNEL__
 285 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 286 #else
 287 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 288 #endif
 289 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 290 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 291                                          EXT4_SB(s)->s_cluster_bits)
 292 #ifdef __KERNEL__
 293 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 294 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 295 #else
 296 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 297 #endif
 298 #ifdef __KERNEL__
 299 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 300 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 301 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 302 #else
 303 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 304                                  EXT4_GOOD_OLD_INODE_SIZE : \
 305                                  (s)->s_inode_size)
 306 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 307                                  EXT4_GOOD_OLD_FIRST_INO : \
 308                                  (s)->s_first_ino)
 309 #endif
 310 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 312         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 313                                                                   blkbits))
 314
 315 /* Translate a block number to a cluster number */
 316 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 317 /* Translate a cluster number to a block number */
 318 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 319 /* Translate # of blks to # of clusters */
 320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 321                                  (sbi)->s_cluster_bits)
 322 /* Mask out the low bits to get the starting block of the cluster */
 323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 324                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 326                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 327 /* Fill in the low bits to get the last block of the cluster */
 328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 329                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 330 /* Get the cluster offset */
 331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 332                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 334                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 335
 336 /*
 337  * Structure of a blocks group descriptor
 338  */
 339 struct ext4_group_desc
 340 {
 341         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 342         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 343         __le32  bg_inode_table_lo;      /* Inodes table block */
 344         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 345         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 346         __le16  bg_used_dirs_count_lo;  /* Directories count */
 347         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 348         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 349         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 350         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 351         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 352         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 353         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 354         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 355         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 356         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 357         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 358         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 359         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 360         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 361         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 362         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 363         __u32   bg_reserved;
 364 };
 365
 366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 367         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 368          sizeof(__le16))
 369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 370         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 371          sizeof(__le16))
 372
 373 /*
 374  * Structure of a flex block group info
 375  */
 376
 377 struct flex_groups {
 378         atomic64_t      free_clusters;
 379         atomic_t        free_inodes;
 380         atomic_t        used_dirs;
 381 };
 382
 383 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 384 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 385 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 386
 387 /*
 388  * Macro-instructions used to manage group descriptors
 389  */
 390 #define EXT4_MIN_DESC_SIZE              32
 391 #define EXT4_MIN_DESC_SIZE_64BIT        64
 392 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 393 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 394 #ifdef __KERNEL__
 395 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 396 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 397 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 398 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 399 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 400 #else
 401 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 402 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 403 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 404 #endif
 405
 406 /*
 407  * Constants relative to the data blocks
 408  */
 409 #define EXT4_NDIR_BLOCKS                12
 410 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 411 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 412 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 413 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 414
 415 /*
 416  * Inode flags
 417  */
 418 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 419 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 420 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 421 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 422 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 423 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 424 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 425 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 426 /* Reserved for compression usage... */
 427 #define EXT4_DIRTY_FL                   0x00000100
 428 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 429 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 430         /* nb: was previously EXT2_ECOMPR_FL */
 431 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 432 /* End compression flags --- maybe not all used */
 433 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 434 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 435 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 436 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 437 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 438 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 439 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 440 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 441 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 442 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 444
 445 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 446
 447 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 448 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 449 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 450 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 451
 452 /* User modifiable flags */
 453 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 454                                          EXT4_UNRM_FL | \
 455                                          EXT4_COMPR_FL | \
 456                                          EXT4_SYNC_FL | \
 457                                          EXT4_IMMUTABLE_FL | \
 458                                          EXT4_APPEND_FL | \
 459                                          EXT4_NODUMP_FL | \
 460                                          EXT4_NOATIME_FL | \
 461                                          EXT4_JOURNAL_DATA_FL | \
 462                                          EXT4_NOTAIL_FL | \
 463                                          EXT4_DIRSYNC_FL | \
 464                                          EXT4_TOPDIR_FL | \
 465                                          EXT4_EXTENTS_FL | \
 466                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 467                                          EXT4_DAX_FL | \
 468                                          EXT4_PROJINHERIT_FL | \
 469                                          EXT4_CASEFOLD_FL)
 470
 471 /* User visible flags */
 472 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 473                                          EXT4_DIRTY_FL | \
 474                                          EXT4_COMPRBLK_FL | \
 475                                          EXT4_NOCOMPR_FL | \
 476                                          EXT4_ENCRYPT_FL | \
 477                                          EXT4_INDEX_FL | \
 478                                          EXT4_VERITY_FL | \
 479                                          EXT4_INLINE_DATA_FL)
 480
 481 /* Flags that should be inherited by new inodes from their parent. */
 482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 483                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 484                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 485                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 486                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 487                            EXT4_DAX_FL)
 488
 489 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 491                            EXT4_PROJINHERIT_FL))
 492
 493 /* Flags that are appropriate for non-directories/regular files. */
 494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 495
 496 /* The only flags that should be swapped */
 497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 498
 499 /* Flags which are mutually exclusive to DAX */
 500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 501                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 502
 503 /* Mask out flags that are inappropriate for the given type of inode. */
 504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 505 {
 506         if (S_ISDIR(mode))
 507                 return flags;
 508         else if (S_ISREG(mode))
 509                 return flags & EXT4_REG_FLMASK;
 510         else
 511                 return flags & EXT4_OTHER_FLMASK;
 512 }
 513
 514 /*
 515  * Inode flags used for atomic set/get
 516  */
 517 enum {
 518         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 519         EXT4_INODE_UNRM         = 1,    /* Undelete */
 520         EXT4_INODE_COMPR        = 2,    /* Compress file */
 521         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 522         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 523         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 524         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 525         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 526 /* Reserved for compression usage... */
 527         EXT4_INODE_DIRTY        = 8,
 528         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 529         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 530         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 531 /* End compression flags --- maybe not all used */
 532         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 533         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 534         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 535         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 536         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 537         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 538         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 539         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 540         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 541         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 543         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 544         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 545         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 546         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 547         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 548 };
 549
 550 /*
 551  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 552  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 553  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 554  * any extra space in the compiled kernel image, otherwise, the build will fail.
 555  * It's important that these values are the same, since we are using
 556  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 557  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 558  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 559  * defined in e2fsprogs.
 560  *
 561  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 562  */
 563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 565
 566 static inline void ext4_check_flag_values(void)
 567 {
 568         CHECK_FLAG_VALUE(SECRM);
 569         CHECK_FLAG_VALUE(UNRM);
 570         CHECK_FLAG_VALUE(COMPR);
 571         CHECK_FLAG_VALUE(SYNC);
 572         CHECK_FLAG_VALUE(IMMUTABLE);
 573         CHECK_FLAG_VALUE(APPEND);
 574         CHECK_FLAG_VALUE(NODUMP);
 575         CHECK_FLAG_VALUE(NOATIME);
 576         CHECK_FLAG_VALUE(DIRTY);
 577         CHECK_FLAG_VALUE(COMPRBLK);
 578         CHECK_FLAG_VALUE(NOCOMPR);
 579         CHECK_FLAG_VALUE(ENCRYPT);
 580         CHECK_FLAG_VALUE(INDEX);
 581         CHECK_FLAG_VALUE(IMAGIC);
 582         CHECK_FLAG_VALUE(JOURNAL_DATA);
 583         CHECK_FLAG_VALUE(NOTAIL);
 584         CHECK_FLAG_VALUE(DIRSYNC);
 585         CHECK_FLAG_VALUE(TOPDIR);
 586         CHECK_FLAG_VALUE(HUGE_FILE);
 587         CHECK_FLAG_VALUE(EXTENTS);
 588         CHECK_FLAG_VALUE(VERITY);
 589         CHECK_FLAG_VALUE(EA_INODE);
 590         CHECK_FLAG_VALUE(INLINE_DATA);
 591         CHECK_FLAG_VALUE(PROJINHERIT);
 592         CHECK_FLAG_VALUE(CASEFOLD);
 593         CHECK_FLAG_VALUE(RESERVED);
 594 }
 595
 596 /* Used to pass group descriptor data when online resize is done */
 597 struct ext4_new_group_input {
 598         __u32 group;            /* Group number for this data */
 599         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 600         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 601         __u64 inode_table;      /* Absolute block number of inode table start */
 602         __u32 blocks_count;     /* Total number of blocks in this group */
 603         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 604         __u16 unused;
 605 };
 606
 607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 608 struct compat_ext4_new_group_input {
 609         u32 group;
 610         compat_u64 block_bitmap;
 611         compat_u64 inode_bitmap;
 612         compat_u64 inode_table;
 613         u32 blocks_count;
 614         u16 reserved_blocks;
 615         u16 unused;
 616 };
 617 #endif
 618
 619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 620 struct ext4_new_group_data {
 621         __u32 group;
 622         __u64 block_bitmap;
 623         __u64 inode_bitmap;
 624         __u64 inode_table;
 625         __u32 blocks_count;
 626         __u16 reserved_blocks;
 627         __u16 mdata_blocks;
 628         __u32 free_clusters_count;
 629 };
 630
 631 /* Indexes used to index group tables in ext4_new_group_data */
 632 enum {
 633         BLOCK_BITMAP = 0,       /* block bitmap */
 634         INODE_BITMAP,           /* inode bitmap */
 635         INODE_TABLE,            /* inode tables */
 636         GROUP_TABLE_COUNT,
 637 };
 638
 639 /*
 640  * Flags used by ext4_map_blocks()
 641  */
 642         /* Allocate any needed blocks and/or convert an unwritten
 643            extent to be an initialized ext4 */
 644 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 645         /* Request the creation of an unwritten extent */
 646 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 648                                                  EXT4_GET_BLOCKS_CREATE)
 649         /* Caller is from the delayed allocation writeout path
 650          * finally doing the actual allocation of delayed blocks */
 651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 652         /* caller is from the direct IO path, request to creation of an
 653         unwritten extents if not allocated, split the unwritten
 654         extent if blocks has been preallocated already*/
 655 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 656 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 658                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 659         /* Convert extent to initialized after IO complete */
 660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 661                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 662         /* Eventual metadata allocation (due to growing extent tree)
 663          * should not fail, so try to use reserved blocks for that.*/
 664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 665         /* Don't normalize allocation size (used for fallocate) */
 666 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 667         /* Convert written extents to unwritten */
 668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 669         /* Write zeros to newly created written extents */
 670 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 671 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 672                                         EXT4_GET_BLOCKS_ZERO)
 673         /* Caller will submit data before dropping transaction handle. This
 674          * allows jbd2 to avoid submitting data before commit. */
 675 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 676         /* Caller is in the atomic contex, find extent if it has been cached */
 677 #define EXT4_GET_BLOCKS_CACHED_NOWAIT           0x0800
 678
 679 /*
 680  * The bit position of these flags must not overlap with any of the
 681  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 682  * read_extent_tree_block(), ext4_split_extent_at(),
 683  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 684  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 685  * caching the extents when reading from the extent tree while a
 686  * truncate or punch hole operation is in progress.
 687  */
 688 #define EXT4_EX_NOCACHE                         0x40000000
 689 #define EXT4_EX_FORCE_CACHE                     0x20000000
 690 #define EXT4_EX_NOFAIL                          0x10000000
 691
 692 /*
 693  * Flags used by ext4_free_blocks
 694  */
 695 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 696 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 697 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 698 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 699 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 700 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 701 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 702
 703 /*
 704  * ioctl commands
 705  */
 706 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 707 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 708 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 709 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 710 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 711 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 712 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 713 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 714 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 715  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 716  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 717 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 718 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 719 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 720 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 721 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 722 /* ioctl codes 19--39 are reserved for fscrypt */
 723 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 724 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 725 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 726 #define EXT4_IOC_CHECKPOINT             _IOW('f', 43, __u32)
 727 #define EXT4_IOC_GETFSUUID              _IOR('f', 44, struct fsuuid)
 728 #define EXT4_IOC_SETFSUUID              _IOW('f', 44, struct fsuuid)
 729
 730 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 731
 732 /*
 733  * Flags for going down operation
 734  */
 735 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 736 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 737 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 738
 739 /*
 740  * Flags returned by EXT4_IOC_GETSTATE
 741  *
 742  * We only expose to userspace a subset of the state flags in
 743  * i_state_flags
 744  */
 745 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 746 #define EXT4_STATE_FLAG_NEW             0x00000002
 747 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 748 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 749
 750 /* flags for ioctl EXT4_IOC_CHECKPOINT */
 751 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD        0x1
 752 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT        0x2
 753 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN        0x4
 754 #define EXT4_IOC_CHECKPOINT_FLAG_VALID          (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
 755                                                 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
 756                                                 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
 757
 758 /*
 759  * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID
 760  */
 761 struct fsuuid {
 762         __u32       fsu_len;
 763         __u32       fsu_flags;
 764         __u8        fsu_uuid[];
 765 };
 766
 767 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 768 /*
 769  * ioctl commands in 32 bit emulation
 770  */
 771 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 772 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 773 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 774 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 775 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 776 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 777 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 778 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 779 #endif
 780
 781 /*
 782  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 783  * It indicates that the entry in extent status cache is for a hole.
 784  */
 785 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 786
 787 /* Max physical block we can address w/o extents */
 788 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 789
 790 /* Max logical block we can support */
 791 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 792
 793 /*
 794  * Structure of an inode on the disk
 795  */
 796 struct ext4_inode {
 797         __le16  i_mode;         /* File mode */
 798         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 799         __le32  i_size_lo;      /* Size in bytes */
 800         __le32  i_atime;        /* Access time */
 801         __le32  i_ctime;        /* Inode Change time */
 802         __le32  i_mtime;        /* Modification time */
 803         __le32  i_dtime;        /* Deletion Time */
 804         __le16  i_gid;          /* Low 16 bits of Group Id */
 805         __le16  i_links_count;  /* Links count */
 806         __le32  i_blocks_lo;    /* Blocks count */
 807         __le32  i_flags;        /* File flags */
 808         union {
 809                 struct {
 810                         __le32  l_i_version;
 811                 } linux1;
 812                 struct {
 813                         __u32  h_i_translator;
 814                 } hurd1;
 815                 struct {
 816                         __u32  m_i_reserved1;
 817                 } masix1;
 818         } osd1;                         /* OS dependent 1 */
 819         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 820         __le32  i_generation;   /* File version (for NFS) */
 821         __le32  i_file_acl_lo;  /* File ACL */
 822         __le32  i_size_high;
 823         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 824         union {
 825                 struct {
 826                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 827                         __le16  l_i_file_acl_high;
 828                         __le16  l_i_uid_high;   /* these 2 fields */
 829                         __le16  l_i_gid_high;   /* were reserved2[0] */
 830                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 831                         __le16  l_i_reserved;
 832                 } linux2;
 833                 struct {
 834                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 835                         __u16   h_i_mode_high;
 836                         __u16   h_i_uid_high;
 837                         __u16   h_i_gid_high;
 838                         __u32   h_i_author;
 839                 } hurd2;
 840                 struct {
 841                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 842                         __le16  m_i_file_acl_high;
 843                         __u32   m_i_reserved2[2];
 844                 } masix2;
 845         } osd2;                         /* OS dependent 2 */
 846         __le16  i_extra_isize;
 847         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 848         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 849         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 850         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 851         __le32  i_crtime;       /* File Creation time */
 852         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 853         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 854         __le32  i_projid;       /* Project ID */
 855 };
 856
 857 struct move_extent {
 858         __u32 reserved;         /* should be zero */
 859         __u32 donor_fd;         /* donor file descriptor */
 860         __u64 orig_start;       /* logical start offset in block for orig */
 861         __u64 donor_start;      /* logical start offset in block for donor */
 862         __u64 len;              /* block length to be moved */
 863         __u64 moved_len;        /* moved block length */
 864 };
 865
 866 #define EXT4_EPOCH_BITS 2
 867 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 868 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 869
 870 /*
 871  * Extended fields will fit into an inode if the filesystem was formatted
 872  * with large inodes (-I 256 or larger) and there are not currently any EAs
 873  * consuming all of the available space. For new inodes we always reserve
 874  * enough space for the kernel's known extended fields, but for inodes
 875  * created with an old kernel this might not have been the case. None of
 876  * the extended inode fields is critical for correct filesystem operation.
 877  * This macro checks if a certain field fits in the inode. Note that
 878  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 879  */
 880 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 881         ((offsetof(typeof(*ext4_inode), field) +        \
 882           sizeof((ext4_inode)->field))                  \
 883         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 884             (einode)->i_extra_isize))                   \
 885
 886 /*
 887  * We use an encoding that preserves the times for extra epoch "00":
 888  *
 889  * extra  msb of                         adjust for signed
 890  * epoch  32-bit                         32-bit tv_sec to
 891  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 892  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 893  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 894  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 895  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 896  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 897  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 898  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 899  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 900  *
 901  * Note that previous versions of the kernel on 64-bit systems would
 902  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 903  * 1970.  e2fsck will correct this, assuming that it is run on the
 904  * affected filesystem before 2242.
 905  */
 906
 907 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 908 {
 909         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 910         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 911 }
 912
 913 static inline void ext4_decode_extra_time(struct timespec64 *time,
 914                                           __le32 extra)
 915 {
 916         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 917                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 918         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 919 }
 920
 921 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 922 do {                                                                            \
 923         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 924                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 925                 (raw_inode)->xtime ## _extra =                                  \
 926                                 ext4_encode_extra_time(&(inode)->xtime);        \
 927                 }                                                               \
 928         else    \
 929                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 930 } while (0)
 931
 932 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 933 do {                                                                           \
 934         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 935                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 936         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 937                 (raw_inode)->xtime ## _extra =                                 \
 938                                 ext4_encode_extra_time(&(einode)->xtime);      \
 939 } while (0)
 940
 941 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 942 do {                                                                            \
 943         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 944         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 945                 ext4_decode_extra_time(&(inode)->xtime,                         \
 946                                        raw_inode->xtime ## _extra);             \
 947                 }                                                               \
 948         else                                                                    \
 949                 (inode)->xtime.tv_nsec = 0;                                     \
 950 } while (0)
 951
 952
 953 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 954 do {                                                                           \
 955         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 956                 (einode)->xtime.tv_sec =                                       \
 957                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 958         else                                                                   \
 959                 (einode)->xtime.tv_sec = 0;                                    \
 960         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 961                 ext4_decode_extra_time(&(einode)->xtime,                       \
 962                                        raw_inode->xtime ## _extra);            \
 963         else                                                                   \
 964                 (einode)->xtime.tv_nsec = 0;                                   \
 965 } while (0)
 966
 967 #define i_disk_version osd1.linux1.l_i_version
 968
 969 #if defined(__KERNEL__) || defined(__linux__)
 970 #define i_reserved1     osd1.linux1.l_i_reserved1
 971 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 972 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 973 #define i_uid_low       i_uid
 974 #define i_gid_low       i_gid
 975 #define i_uid_high      osd2.linux2.l_i_uid_high
 976 #define i_gid_high      osd2.linux2.l_i_gid_high
 977 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 978
 979 #elif defined(__GNU__)
 980
 981 #define i_translator    osd1.hurd1.h_i_translator
 982 #define i_uid_high      osd2.hurd2.h_i_uid_high
 983 #define i_gid_high      osd2.hurd2.h_i_gid_high
 984 #define i_author        osd2.hurd2.h_i_author
 985
 986 #elif defined(__masix__)
 987
 988 #define i_reserved1     osd1.masix1.m_i_reserved1
 989 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 990 #define i_reserved2     osd2.masix2.m_i_reserved2
 991
 992 #endif /* defined(__KERNEL__) || defined(__linux__) */
 993
 994 #include "extents_status.h"
 995 #include "fast_commit.h"
 996
 997 /*
 998  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 999  *
1000  * These are needed to avoid lockdep false positives when we need to
1001  * allocate blocks to the quota inode during ext4_map_blocks(), while
1002  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
1003  * do quota tracking for the quota inode, this avoids deadlock (as
1004  * well as infinite recursion, since it isn't turtles all the way
1005  * down...)
1006  *
1007  *  I_DATA_SEM_NORMAL - Used for most inodes
1008  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
1009  *                        where the second inode has larger inode number
1010  *                        than the first
1011  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
1012  */
1013 enum {
1014         I_DATA_SEM_NORMAL = 0,
1015         I_DATA_SEM_OTHER,
1016         I_DATA_SEM_QUOTA,
1017 };
1018
1019
1020 /*
1021  * fourth extended file system inode data in memory
1022  */
1023 struct ext4_inode_info {
1024         __le32  i_data[15];     /* unconverted */
1025         __u32   i_dtime;
1026         ext4_fsblk_t    i_file_acl;
1027
1028         /*
1029          * i_block_group is the number of the block group which contains
1030          * this file's inode.  Constant across the lifetime of the inode,
1031          * it is used for making block allocation decisions - we try to
1032          * place a file's data blocks near its inode block, and new inodes
1033          * near to their parent directory's inode.
1034          */
1035         ext4_group_t    i_block_group;
1036         ext4_lblk_t     i_dir_start_lookup;
1037 #if (BITS_PER_LONG < 64)
1038         unsigned long   i_state_flags;          /* Dynamic state flags */
1039 #endif
1040         unsigned long   i_flags;
1041
1042         /*
1043          * Extended attributes can be read independently of the main file
1044          * data. Taking i_rwsem even when reading would cause contention
1045          * between readers of EAs and writers of regular file data, so
1046          * instead we synchronize on xattr_sem when reading or changing
1047          * EAs.
1048          */
1049         struct rw_semaphore xattr_sem;
1050
1051         /*
1052          * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1053          * i_orphan is used.
1054          */
1055         union {
1056                 struct list_head i_orphan;      /* unlinked but open inodes */
1057                 unsigned int i_orphan_idx;      /* Index in orphan file */
1058         };
1059
1060         /* Fast commit related info */
1061
1062         /* For tracking dentry create updates */
1063         struct list_head i_fc_dilist;
1064         struct list_head i_fc_list;     /*
1065                                          * inodes that need fast commit
1066                                          * protected by sbi->s_fc_lock.
1067                                          */
1068
1069         /* Start of lblk range that needs to be committed in this fast commit */
1070         ext4_lblk_t i_fc_lblk_start;
1071
1072         /* End of lblk range that needs to be committed in this fast commit */
1073         ext4_lblk_t i_fc_lblk_len;
1074
1075         /* Number of ongoing updates on this inode */
1076         atomic_t  i_fc_updates;
1077
1078         /* Fast commit wait queue for this inode */
1079         wait_queue_head_t i_fc_wait;
1080
1081         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1082         struct mutex i_fc_lock;
1083
1084         /*
1085          * i_disksize keeps track of what the inode size is ON DISK, not
1086          * in memory.  During truncate, i_size is set to the new size by
1087          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1088          * set i_disksize to 0 until the truncate is actually under way.
1089          *
1090          * The intent is that i_disksize always represents the blocks which
1091          * are used by this file.  This allows recovery to restart truncate
1092          * on orphans if we crash during truncate.  We actually write i_disksize
1093          * into the on-disk inode when writing inodes out, instead of i_size.
1094          *
1095          * The only time when i_disksize and i_size may be different is when
1096          * a truncate is in progress.  The only things which change i_disksize
1097          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1098          */
1099         loff_t  i_disksize;
1100
1101         /*
1102          * i_data_sem is for serialising ext4_truncate() against
1103          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1104          * data tree are chopped off during truncate. We can't do that in
1105          * ext4 because whenever we perform intermediate commits during
1106          * truncate, the inode and all the metadata blocks *must* be in a
1107          * consistent state which allows truncation of the orphans to restart
1108          * during recovery.  Hence we must fix the get_block-vs-truncate race
1109          * by other means, so we have i_data_sem.
1110          */
1111         struct rw_semaphore i_data_sem;
1112         struct inode vfs_inode;
1113         struct jbd2_inode *jinode;
1114
1115         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1116
1117         /*
1118          * File creation time. Its function is same as that of
1119          * struct timespec64 i_{a,c,m}time in the generic inode.
1120          */
1121         struct timespec64 i_crtime;
1122
1123         /* mballoc */
1124         atomic_t i_prealloc_active;
1125         struct list_head i_prealloc_list;
1126         spinlock_t i_prealloc_lock;
1127
1128         /* extents status tree */
1129         struct ext4_es_tree i_es_tree;
1130         rwlock_t i_es_lock;
1131         struct list_head i_es_list;
1132         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1133         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1134         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1135                                            extents to shrink. Protected by
1136                                            i_es_lock  */
1137
1138         /* ialloc */
1139         ext4_group_t    i_last_alloc_group;
1140
1141         /* allocation reservation info for delalloc */
1142         /* In case of bigalloc, this refer to clusters rather than blocks */
1143         unsigned int i_reserved_data_blocks;
1144
1145         /* pending cluster reservations for bigalloc file systems */
1146         struct ext4_pending_tree i_pending_tree;
1147
1148         /* on-disk additional length */
1149         __u16 i_extra_isize;
1150
1151         /* Indicate the inline data space. */
1152         u16 i_inline_off;
1153         u16 i_inline_size;
1154
1155 #ifdef CONFIG_QUOTA
1156         /* quota space reservation, managed internally by quota code */
1157         qsize_t i_reserved_quota;
1158 #endif
1159
1160         /* Lock protecting lists below */
1161         spinlock_t i_completed_io_lock;
1162         /*
1163          * Completed IOs that need unwritten extents handling and have
1164          * transaction reserved
1165          */
1166         struct list_head i_rsv_conversion_list;
1167         struct work_struct i_rsv_conversion_work;
1168         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1169
1170         spinlock_t i_block_reservation_lock;
1171
1172         /*
1173          * Transactions that contain inode's metadata needed to complete
1174          * fsync and fdatasync, respectively.
1175          */
1176         tid_t i_sync_tid;
1177         tid_t i_datasync_tid;
1178
1179 #ifdef CONFIG_QUOTA
1180         struct dquot *i_dquot[MAXQUOTAS];
1181 #endif
1182
1183         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1184         __u32 i_csum_seed;
1185
1186         kprojid_t i_projid;
1187 };
1188
1189 /*
1190  * File system states
1191  */
1192 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1193 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1194 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1195 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1196
1197 /*
1198  * Misc. filesystem flags
1199  */
1200 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1201 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1202 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1203
1204 /*
1205  * Mount flags set via mount options or defaults
1206  */
1207 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1208 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1209 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1210 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1211 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1212 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1213 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1214 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1215 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1216 #ifdef CONFIG_FS_DAX
1217 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1218 #else
1219 #define EXT4_MOUNT_DAX_ALWAYS           0
1220 #endif
1221 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1222 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1223 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1224 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1225 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1226 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1227 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1228 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1229 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1230 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1231 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1232 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1233                                                  * enable enforcement for hidden
1234                                                  * quota files */
1235 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1236                                                   * enforcement for hidden quota
1237                                                   * files */
1238 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1239                                                   * enforcement */
1240 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1241 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1242 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1243 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1244 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1245 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1246 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1247 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1248 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1249 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1250
1251 /*
1252  * Mount flags set either automatically (could not be set by mount option)
1253  * based on per file system feature or property or in special cases such as
1254  * distinguishing between explicit mount option definition and default.
1255  */
1256 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1257                                                       specified delalloc */
1258 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1259                                                       size of blocksize * 8
1260                                                       blocks */
1261 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1262                                                       file systems */
1263 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1264                                                 specified journal checksum */
1265
1266 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1267 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1268 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1269 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN    0x00000080 /* Optimize group
1270                                                     * scanning in mballoc
1271                                                     */
1272
1273 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1274                                                 ~EXT4_MOUNT_##opt
1275 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1276                                                 EXT4_MOUNT_##opt
1277 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1278                                          EXT4_MOUNT_##opt)
1279
1280 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1281                                                 ~EXT4_MOUNT2_##opt
1282 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1283                                                 EXT4_MOUNT2_##opt
1284 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1285                                          EXT4_MOUNT2_##opt)
1286
1287 #define ext4_test_and_set_bit           __test_and_set_bit_le
1288 #define ext4_set_bit                    __set_bit_le
1289 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1290 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1291 #define ext4_clear_bit                  __clear_bit_le
1292 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1293 #define ext4_test_bit                   test_bit_le
1294 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1295 #define ext4_find_next_bit              find_next_bit_le
1296
1297 extern void mb_set_bits(void *bm, int cur, int len);
1298
1299 /*
1300  * Maximal mount counts between two filesystem checks
1301  */
1302 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1303 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1304
1305 /*
1306  * Behaviour when detecting errors
1307  */
1308 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1309 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1310 #define EXT4_ERRORS_PANIC               3       /* Panic */
1311 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1312
1313 /* Metadata checksum algorithm codes */
1314 #define EXT4_CRC32C_CHKSUM              1
1315
1316 #define EXT4_LABEL_MAX                  16
1317
1318 /*
1319  * Structure of the super block
1320  */
1321 struct ext4_super_block {
1322 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1323         __le32  s_blocks_count_lo;      /* Blocks count */
1324         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1325         __le32  s_free_blocks_count_lo; /* Free blocks count */
1326 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1327         __le32  s_first_data_block;     /* First Data Block */
1328         __le32  s_log_block_size;       /* Block size */
1329         __le32  s_log_cluster_size;     /* Allocation cluster size */
1330 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1331         __le32  s_clusters_per_group;   /* # Clusters per group */
1332         __le32  s_inodes_per_group;     /* # Inodes per group */
1333         __le32  s_mtime;                /* Mount time */
1334 /*30*/  __le32  s_wtime;                /* Write time */
1335         __le16  s_mnt_count;            /* Mount count */
1336         __le16  s_max_mnt_count;        /* Maximal mount count */
1337         __le16  s_magic;                /* Magic signature */
1338         __le16  s_state;                /* File system state */
1339         __le16  s_errors;               /* Behaviour when detecting errors */
1340         __le16  s_minor_rev_level;      /* minor revision level */
1341 /*40*/  __le32  s_lastcheck;            /* time of last check */
1342         __le32  s_checkinterval;        /* max. time between checks */
1343         __le32  s_creator_os;           /* OS */
1344         __le32  s_rev_level;            /* Revision level */
1345 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1346         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1347         /*
1348          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1349          *
1350          * Note: the difference between the compatible feature set and
1351          * the incompatible feature set is that if there is a bit set
1352          * in the incompatible feature set that the kernel doesn't
1353          * know about, it should refuse to mount the filesystem.
1354          *
1355          * e2fsck's requirements are more strict; if it doesn't know
1356          * about a feature in either the compatible or incompatible
1357          * feature set, it must abort and not try to meddle with
1358          * things it doesn't understand...
1359          */
1360         __le32  s_first_ino;            /* First non-reserved inode */
1361         __le16  s_inode_size;           /* size of inode structure */
1362         __le16  s_block_group_nr;       /* block group # of this superblock */
1363         __le32  s_feature_compat;       /* compatible feature set */
1364 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1365         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1366 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1367 /*78*/  char    s_volume_name[EXT4_LABEL_MAX];  /* volume name */
1368 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1369 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1370         /*
1371          * Performance hints.  Directory preallocation should only
1372          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1373          */
1374         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1375         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1376         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1377         /*
1378          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1379          */
1380 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1381 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1382         __le32  s_journal_dev;          /* device number of journal file */
1383         __le32  s_last_orphan;          /* start of list of inodes to delete */
1384         __le32  s_hash_seed[4];         /* HTREE hash seed */
1385         __u8    s_def_hash_version;     /* Default hash version to use */
1386         __u8    s_jnl_backup_type;
1387         __le16  s_desc_size;            /* size of group descriptor */
1388 /*100*/ __le32  s_default_mount_opts;
1389         __le32  s_first_meta_bg;        /* First metablock block group */
1390         __le32  s_mkfs_time;            /* When the filesystem was created */
1391         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1392         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1393 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1394         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1395         __le32  s_free_blocks_count_hi; /* Free blocks count */
1396         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1397         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1398         __le32  s_flags;                /* Miscellaneous flags */
1399         __le16  s_raid_stride;          /* RAID stride */
1400         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1401         __le64  s_mmp_block;            /* Block for multi-mount protection */
1402         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1403         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1404         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1405         __u8    s_encryption_level;     /* versioning level for encryption */
1406         __u8    s_reserved_pad;         /* Padding to next 32bits */
1407         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1408         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1409         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1410         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1411                                               snapshot's future use */
1412         __le32  s_snapshot_list;        /* inode number of the head of the
1413                                            on-disk snapshot list */
1414 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1415         __le32  s_error_count;          /* number of fs errors */
1416         __le32  s_first_error_time;     /* first time an error happened */
1417         __le32  s_first_error_ino;      /* inode involved in first error */
1418         __le64  s_first_error_block;    /* block involved of first error */
1419         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1420         __le32  s_first_error_line;     /* line number where error happened */
1421         __le32  s_last_error_time;      /* most recent time of an error */
1422         __le32  s_last_error_ino;       /* inode involved in last error */
1423         __le32  s_last_error_line;      /* line number where error happened */
1424         __le64  s_last_error_block;     /* block involved of last error */
1425         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1426 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1427         __u8    s_mount_opts[64];
1428         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1429         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1430         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1431         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1432         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1433         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1434         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1435         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1436         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1437         __u8    s_wtime_hi;
1438         __u8    s_mtime_hi;
1439         __u8    s_mkfs_time_hi;
1440         __u8    s_lastcheck_hi;
1441         __u8    s_first_error_time_hi;
1442         __u8    s_last_error_time_hi;
1443         __u8    s_first_error_errcode;
1444         __u8    s_last_error_errcode;
1445         __le16  s_encoding;             /* Filename charset encoding */
1446         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1447         __le32  s_orphan_file_inum;     /* Inode for tracking orphan inodes */
1448         __le32  s_reserved[94];         /* Padding to the end of the block */
1449         __le32  s_checksum;             /* crc32c(superblock) */
1450 };
1451
1452 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1453
1454 #ifdef __KERNEL__
1455
1456 /* Number of quota types we support */
1457 #define EXT4_MAXQUOTAS 3
1458
1459 #define EXT4_ENC_UTF8_12_1      1
1460
1461 /* Types of ext4 journal triggers */
1462 enum ext4_journal_trigger_type {
1463         EXT4_JTR_ORPHAN_FILE,
1464         EXT4_JTR_NONE   /* This must be the last entry for indexing to work! */
1465 };
1466
1467 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1468
1469 struct ext4_journal_trigger {
1470         struct jbd2_buffer_trigger_type tr_triggers;
1471         struct super_block *sb;
1472 };
1473
1474 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1475                                 struct jbd2_buffer_trigger_type *trigger)
1476 {
1477         return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1478 }
1479
1480 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1481
1482 /* Structure at the tail of orphan block */
1483 struct ext4_orphan_block_tail {
1484         __le32 ob_magic;
1485         __le32 ob_checksum;
1486 };
1487
1488 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1489 {
1490         return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1491                         sizeof(u32);
1492 }
1493
1494 struct ext4_orphan_block {
1495         atomic_t ob_free_entries;       /* Number of free orphan entries in block */
1496         struct buffer_head *ob_bh;      /* Buffer for orphan block */
1497 };
1498
1499 /*
1500  * Info about orphan file.
1501  */
1502 struct ext4_orphan_info {
1503         int of_blocks;                  /* Number of orphan blocks in a file */
1504         __u32 of_csum_seed;             /* Checksum seed for orphan file */
1505         struct ext4_orphan_block *of_binfo;     /* Array with info about orphan
1506                                                  * file blocks */
1507 };
1508
1509 /*
1510  * fourth extended-fs super-block data in memory
1511  */
1512 struct ext4_sb_info {
1513         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1514         unsigned long s_inodes_per_block;/* Number of inodes per block */
1515         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1516         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1517         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1518         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1519         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1520         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1521         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1522         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1523         unsigned long s_overhead;  /* # of fs overhead clusters */
1524         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1525         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1526         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1527         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1528         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1529         struct buffer_head * __rcu *s_group_desc;
1530         unsigned int s_mount_opt;
1531         unsigned int s_mount_opt2;
1532         unsigned long s_mount_flags;
1533         unsigned int s_def_mount_opt;
1534         ext4_fsblk_t s_sb_block;
1535         atomic64_t s_resv_clusters;
1536         kuid_t s_resuid;
1537         kgid_t s_resgid;
1538         unsigned short s_mount_state;
1539         unsigned short s_pad;
1540         int s_addr_per_block_bits;
1541         int s_desc_per_block_bits;
1542         int s_inode_size;
1543         int s_first_ino;
1544         unsigned int s_inode_readahead_blks;
1545         unsigned int s_inode_goal;
1546         u32 s_hash_seed[4];
1547         int s_def_hash_version;
1548         int s_hash_unsigned;    /* 3 if hash should be unsigned, 0 if not */
1549         struct percpu_counter s_freeclusters_counter;
1550         struct percpu_counter s_freeinodes_counter;
1551         struct percpu_counter s_dirs_counter;
1552         struct percpu_counter s_dirtyclusters_counter;
1553         struct percpu_counter s_sra_exceeded_retry_limit;
1554         struct blockgroup_lock *s_blockgroup_lock;
1555         struct proc_dir_entry *s_proc;
1556         struct kobject s_kobj;
1557         struct completion s_kobj_unregister;
1558         struct super_block *s_sb;
1559         struct buffer_head *s_mmp_bh;
1560
1561         /* Journaling */
1562         struct journal_s *s_journal;
1563         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1564         struct mutex s_orphan_lock;     /* Protects on disk list changes */
1565         struct list_head s_orphan;      /* List of orphaned inodes in on disk
1566                                            list */
1567         struct ext4_orphan_info s_orphan_info;
1568         unsigned long s_commit_interval;
1569         u32 s_max_batch_time;
1570         u32 s_min_batch_time;
1571         struct block_device *s_journal_bdev;
1572 #ifdef CONFIG_QUOTA
1573         /* Names of quota files with journalled quota */
1574         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1575         int s_jquota_fmt;                       /* Format of quota to use */
1576 #endif
1577         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1578         struct ext4_system_blocks __rcu *s_system_blks;
1579
1580 #ifdef EXTENTS_STATS
1581         /* ext4 extents stats */
1582         unsigned long s_ext_min;
1583         unsigned long s_ext_max;
1584         unsigned long s_depth_max;
1585         spinlock_t s_ext_stats_lock;
1586         unsigned long s_ext_blocks;
1587         unsigned long s_ext_extents;
1588 #endif
1589
1590         /* for buddy allocator */
1591         struct ext4_group_info ** __rcu *s_group_info;
1592         struct inode *s_buddy_cache;
1593         spinlock_t s_md_lock;
1594         unsigned short *s_mb_offsets;
1595         unsigned int *s_mb_maxs;
1596         unsigned int s_group_info_size;
1597         unsigned int s_mb_free_pending;
1598         struct list_head s_freed_data_list;     /* List of blocks to be freed
1599                                                    after commit completed */
1600         struct list_head s_discard_list;
1601         struct work_struct s_discard_work;
1602         atomic_t s_retry_alloc_pending;
1603         struct rb_root s_mb_avg_fragment_size_root;
1604         rwlock_t s_mb_rb_lock;
1605         struct list_head *s_mb_largest_free_orders;
1606         rwlock_t *s_mb_largest_free_orders_locks;
1607
1608         /* tunables */
1609         unsigned long s_stripe;
1610         unsigned int s_mb_max_linear_groups;
1611         unsigned int s_mb_stream_request;
1612         unsigned int s_mb_max_to_scan;
1613         unsigned int s_mb_min_to_scan;
1614         unsigned int s_mb_stats;
1615         unsigned int s_mb_order2_reqs;
1616         unsigned int s_mb_group_prealloc;
1617         unsigned int s_mb_max_inode_prealloc;
1618         unsigned int s_max_dir_size_kb;
1619         /* where last allocation was done - for stream allocation */
1620         unsigned long s_mb_last_group;
1621         unsigned long s_mb_last_start;
1622         unsigned int s_mb_prefetch;
1623         unsigned int s_mb_prefetch_limit;
1624
1625         /* stats for buddy allocator */
1626         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1627         atomic_t s_bal_success; /* we found long enough chunks */
1628         atomic_t s_bal_allocated;       /* in blocks */
1629         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1630         atomic_t s_bal_groups_scanned;  /* number of groups scanned */
1631         atomic_t s_bal_goals;   /* goal hits */
1632         atomic_t s_bal_breaks;  /* too long searches */
1633         atomic_t s_bal_2orders; /* 2^order hits */
1634         atomic_t s_bal_cr0_bad_suggestions;
1635         atomic_t s_bal_cr1_bad_suggestions;
1636         atomic64_t s_bal_cX_groups_considered[4];
1637         atomic64_t s_bal_cX_hits[4];
1638         atomic64_t s_bal_cX_failed[4];          /* cX loop didn't find blocks */
1639         atomic_t s_mb_buddies_generated;        /* number of buddies generated */
1640         atomic64_t s_mb_generation_time;
1641         atomic_t s_mb_lost_chunks;
1642         atomic_t s_mb_preallocated;
1643         atomic_t s_mb_discarded;
1644         atomic_t s_lock_busy;
1645
1646         /* locality groups */
1647         struct ext4_locality_group __percpu *s_locality_groups;
1648
1649         /* for write statistics */
1650         unsigned long s_sectors_written_start;
1651         u64 s_kbytes_written;
1652
1653         /* the size of zero-out chunk */
1654         unsigned int s_extent_max_zeroout_kb;
1655
1656         unsigned int s_log_groups_per_flex;
1657         struct flex_groups * __rcu *s_flex_groups;
1658         ext4_group_t s_flex_groups_allocated;
1659
1660         /* workqueue for reserved extent conversions (buffered io) */
1661         struct workqueue_struct *rsv_conversion_wq;
1662
1663         /* timer for periodic error stats printing */
1664         struct timer_list s_err_report;
1665
1666         /* Lazy inode table initialization info */
1667         struct ext4_li_request *s_li_request;
1668         /* Wait multiplier for lazy initialization thread */
1669         unsigned int s_li_wait_mult;
1670
1671         /* Kernel thread for multiple mount protection */
1672         struct task_struct *s_mmp_tsk;
1673
1674         /* record the last minlen when FITRIM is called. */
1675         unsigned long s_last_trim_minblks;
1676
1677         /* Reference to checksum algorithm driver via cryptoapi */
1678         struct crypto_shash *s_chksum_driver;
1679
1680         /* Precomputed FS UUID checksum for seeding other checksums */
1681         __u32 s_csum_seed;
1682
1683         /* Reclaim extents from extent status tree */
1684         struct shrinker s_es_shrinker;
1685         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1686         long s_es_nr_inode;
1687         struct ext4_es_stats s_es_stats;
1688         struct mb_cache *s_ea_block_cache;
1689         struct mb_cache *s_ea_inode_cache;
1690         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1691
1692         /* Journal triggers for checksum computation */
1693         struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1694
1695         /* Ratelimit ext4 messages. */
1696         struct ratelimit_state s_err_ratelimit_state;
1697         struct ratelimit_state s_warning_ratelimit_state;
1698         struct ratelimit_state s_msg_ratelimit_state;
1699         atomic_t s_warning_count;
1700         atomic_t s_msg_count;
1701
1702         /* Encryption policy for '-o test_dummy_encryption' */
1703         struct fscrypt_dummy_policy s_dummy_enc_policy;
1704
1705         /*
1706          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1707          * or EXTENTS flag.
1708          */
1709         struct percpu_rw_semaphore s_writepages_rwsem;
1710         struct dax_device *s_daxdev;
1711         u64 s_dax_part_off;
1712 #ifdef CONFIG_EXT4_DEBUG
1713         unsigned long s_simulate_fail;
1714 #endif
1715         /* Record the errseq of the backing block device */
1716         errseq_t s_bdev_wb_err;
1717         spinlock_t s_bdev_wb_lock;
1718
1719         /* Information about errors that happened during this mount */
1720         spinlock_t s_error_lock;
1721         int s_add_error_count;
1722         int s_first_error_code;
1723         __u32 s_first_error_line;
1724         __u32 s_first_error_ino;
1725         __u64 s_first_error_block;
1726         const char *s_first_error_func;
1727         time64_t s_first_error_time;
1728         int s_last_error_code;
1729         __u32 s_last_error_line;
1730         __u32 s_last_error_ino;
1731         __u64 s_last_error_block;
1732         const char *s_last_error_func;
1733         time64_t s_last_error_time;
1734         /*
1735          * If we are in a context where we cannot update error information in
1736          * the on-disk superblock, we queue this work to do it.
1737          */
1738         struct work_struct s_error_work;
1739
1740         /* Ext4 fast commit sub transaction ID */
1741         atomic_t s_fc_subtid;
1742
1743         /*
1744          * After commit starts, the main queue gets locked, and the further
1745          * updates get added in the staging queue.
1746          */
1747 #define FC_Q_MAIN       0
1748 #define FC_Q_STAGING    1
1749         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1750                                          * that have data changes in them.
1751                                          */
1752         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1753         unsigned int s_fc_bytes;
1754         /*
1755          * Main fast commit lock. This lock protects accesses to the
1756          * following fields:
1757          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1758          */
1759         spinlock_t s_fc_lock;
1760         struct buffer_head *s_fc_bh;
1761         struct ext4_fc_stats s_fc_stats;
1762         tid_t s_fc_ineligible_tid;
1763 #ifdef CONFIG_EXT4_DEBUG
1764         int s_fc_debug_max_replay;
1765 #endif
1766         struct ext4_fc_replay_state s_fc_replay_state;
1767 };
1768
1769 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1770 {
1771         return sb->s_fs_info;
1772 }
1773 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1774 {
1775         return container_of(inode, struct ext4_inode_info, vfs_inode);
1776 }
1777
1778 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1779 {
1780         return ino == EXT4_ROOT_INO ||
1781                 (ino >= EXT4_FIRST_INO(sb) &&
1782                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1783 }
1784
1785 /*
1786  * Returns: sbi->field[index]
1787  * Used to access an array element from the following sbi fields which require
1788  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1789  * - s_group_desc
1790  * - s_group_info
1791  * - s_flex_group
1792  */
1793 #define sbi_array_rcu_deref(sbi, field, index)                             \
1794 ({                                                                         \
1795         typeof(*((sbi)->field)) _v;                                        \
1796         rcu_read_lock();                                                   \
1797         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1798         rcu_read_unlock();                                                 \
1799         _v;                                                                \
1800 })
1801
1802 /*
1803  * run-time mount flags
1804  */
1805 enum {
1806         EXT4_MF_MNTDIR_SAMPLED,
1807         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1808         EXT4_MF_FC_INELIGIBLE   /* Fast commit ineligible */
1809 };
1810
1811 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1812 {
1813         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1814 }
1815
1816 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1817 {
1818         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1819 }
1820
1821 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1822 {
1823         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1824 }
1825
1826
1827 /*
1828  * Simulate_fail codes
1829  */
1830 #define EXT4_SIM_BBITMAP_EIO    1
1831 #define EXT4_SIM_BBITMAP_CRC    2
1832 #define EXT4_SIM_IBITMAP_EIO    3
1833 #define EXT4_SIM_IBITMAP_CRC    4
1834 #define EXT4_SIM_INODE_EIO      5
1835 #define EXT4_SIM_INODE_CRC      6
1836 #define EXT4_SIM_DIRBLOCK_EIO   7
1837 #define EXT4_SIM_DIRBLOCK_CRC   8
1838
1839 static inline bool ext4_simulate_fail(struct super_block *sb,
1840                                      unsigned long code)
1841 {
1842 #ifdef CONFIG_EXT4_DEBUG
1843         struct ext4_sb_info *sbi = EXT4_SB(sb);
1844
1845         if (unlikely(sbi->s_simulate_fail == code)) {
1846                 sbi->s_simulate_fail = 0;
1847                 return true;
1848         }
1849 #endif
1850         return false;
1851 }
1852
1853 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1854                                          struct buffer_head *bh,
1855                                          unsigned long code)
1856 {
1857         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1858                 clear_buffer_uptodate(bh);
1859 }
1860
1861 /*
1862  * Error number codes for s_{first,last}_error_errno
1863  *
1864  * Linux errno numbers are architecture specific, so we need to translate
1865  * them into something which is architecture independent.   We don't define
1866  * codes for all errno's; just the ones which are most likely to be the cause
1867  * of an ext4_error() call.
1868  */
1869 #define EXT4_ERR_UNKNOWN         1
1870 #define EXT4_ERR_EIO             2
1871 #define EXT4_ERR_ENOMEM          3
1872 #define EXT4_ERR_EFSBADCRC       4
1873 #define EXT4_ERR_EFSCORRUPTED    5
1874 #define EXT4_ERR_ENOSPC          6
1875 #define EXT4_ERR_ENOKEY          7
1876 #define EXT4_ERR_EROFS           8
1877 #define EXT4_ERR_EFBIG           9
1878 #define EXT4_ERR_EEXIST         10
1879 #define EXT4_ERR_ERANGE         11
1880 #define EXT4_ERR_EOVERFLOW      12
1881 #define EXT4_ERR_EBUSY          13
1882 #define EXT4_ERR_ENOTDIR        14
1883 #define EXT4_ERR_ENOTEMPTY      15
1884 #define EXT4_ERR_ESHUTDOWN      16
1885 #define EXT4_ERR_EFAULT         17
1886
1887 /*
1888  * Inode dynamic state flags
1889  */
1890 enum {
1891         EXT4_STATE_JDATA,               /* journaled data exists */
1892         EXT4_STATE_NEW,                 /* inode is newly created */
1893         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1894         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1895         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1896         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1897         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1898         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1899         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1900         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1901         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1902         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1903         EXT4_STATE_ORPHAN_FILE,         /* Inode orphaned in orphan file */
1904 };
1905
1906 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1907 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1908 {                                                                       \
1909         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1910 }                                                                       \
1911 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1912 {                                                                       \
1913         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1914 }                                                                       \
1915 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1916 {                                                                       \
1917         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1918 }
1919
1920 /* Add these declarations here only so that these functions can be
1921  * found by name.  Otherwise, they are very hard to locate. */
1922 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1923 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1924 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1925 EXT4_INODE_BIT_FNS(flag, flags, 0)
1926
1927 /* Add these declarations here only so that these functions can be
1928  * found by name.  Otherwise, they are very hard to locate. */
1929 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1930 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1931 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1932 #if (BITS_PER_LONG < 64)
1933 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1934
1935 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1936 {
1937         (ei)->i_state_flags = 0;
1938 }
1939 #else
1940 EXT4_INODE_BIT_FNS(state, flags, 32)
1941
1942 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1943 {
1944         /* We depend on the fact that callers will set i_flags */
1945 }
1946 #endif
1947 #else
1948 /* Assume that user mode programs are passing in an ext4fs superblock, not
1949  * a kernel struct super_block.  This will allow us to call the feature-test
1950  * macros from user land. */
1951 #define EXT4_SB(sb)     (sb)
1952 #endif
1953
1954 static inline bool ext4_verity_in_progress(struct inode *inode)
1955 {
1956         return IS_ENABLED(CONFIG_FS_VERITY) &&
1957                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1958 }
1959
1960 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1961
1962 /*
1963  * Codes for operating systems
1964  */
1965 #define EXT4_OS_LINUX           0
1966 #define EXT4_OS_HURD            1
1967 #define EXT4_OS_MASIX           2
1968 #define EXT4_OS_FREEBSD         3
1969 #define EXT4_OS_LITES           4
1970
1971 /*
1972  * Revision levels
1973  */
1974 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1975 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1976
1977 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1978
1979 #define EXT4_GOOD_OLD_INODE_SIZE 128
1980
1981 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1982 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1983 #define EXT4_TIMESTAMP_MIN              S32_MIN
1984
1985 /*
1986  * Feature set definitions
1987  */
1988
1989 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1990 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1991 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1992 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1993 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1994 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1995 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1996 /*
1997  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1998  * incompatible only if fast commit blocks are present in the FS. Since we
1999  * clear the journal (and thus the fast commit blocks), we don't mark FS as
2000  * incompatible. We also have a JBD2 incompat feature, which gets set when
2001  * there are fast commit blocks present in the journal.
2002  */
2003 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
2004 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
2005 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE         0x1000  /* Orphan file exists */
2006
2007 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
2008 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
2009 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
2010 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2011 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
2012 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
2013 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
2014 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
2015 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
2016 /*
2017  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2018  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2019  * all other data structures' checksums.  However, the METADATA_CSUM and
2020  * GDT_CSUM bits are mutually exclusive.
2021  */
2022 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
2023 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
2024 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
2025 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
2026 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT   0x10000 /* Orphan file may be
2027                                                            non-empty */
2028
2029 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
2030 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
2031 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
2032 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
2033 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
2034 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
2035 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
2036 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2037 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
2038 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
2039 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
2040 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
2041 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
2042 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
2043 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
2044 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
2045
2046 extern void ext4_update_dynamic_rev(struct super_block *sb);
2047
2048 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2049 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2050 { \
2051         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2052                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2053 } \
2054 static inline void ext4_set_feature_##name(struct super_block *sb) \
2055 { \
2056         ext4_update_dynamic_rev(sb); \
2057         EXT4_SB(sb)->s_es->s_feature_compat |= \
2058                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2059 } \
2060 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2061 { \
2062         EXT4_SB(sb)->s_es->s_feature_compat &= \
2063                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2064 }
2065
2066 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2067 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2068 { \
2069         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2070                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2071 } \
2072 static inline void ext4_set_feature_##name(struct super_block *sb) \
2073 { \
2074         ext4_update_dynamic_rev(sb); \
2075         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2076                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2077 } \
2078 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2079 { \
2080         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2081                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2082 }
2083
2084 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2085 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2086 { \
2087         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2088                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2089 } \
2090 static inline void ext4_set_feature_##name(struct super_block *sb) \
2091 { \
2092         ext4_update_dynamic_rev(sb); \
2093         EXT4_SB(sb)->s_es->s_feature_incompat |= \
2094                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2095 } \
2096 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2097 { \
2098         EXT4_SB(sb)->s_es->s_feature_incompat &= \
2099                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2100 }
2101
2102 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
2103 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
2104 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
2105 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
2106 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
2107 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
2108 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
2109 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
2110 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
2111 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,          ORPHAN_FILE)
2112
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
2117 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
2118 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
2119 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
2120 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
2121 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
2122 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
2123 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
2124 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
2125 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
2126 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,    ORPHAN_PRESENT)
2127
2128 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
2134 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
2135 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
2136 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
2137 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
2138 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
2139 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
2140 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
2141 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2142 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2143 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2144
2145 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2146 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2147                                          EXT4_FEATURE_INCOMPAT_META_BG)
2148 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2149                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2150                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2151
2152 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2153 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2154                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2155                                          EXT4_FEATURE_INCOMPAT_META_BG)
2156 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2157                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2158                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2159
2160 #define EXT4_FEATURE_COMPAT_SUPP        (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2161                                          EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2162 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2163                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2164                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2165                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2166                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2167                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2168                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2169                                          EXT4_FEATURE_INCOMPAT_MMP | \
2170                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2171                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2172                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2173                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2174                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2175 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2176                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2177                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2178                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2179                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2180                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2181                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2182                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2183                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2184                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2185                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2186                                          EXT4_FEATURE_RO_COMPAT_VERITY |\
2187                                          EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2188
2189 #define EXTN_FEATURE_FUNCS(ver) \
2190 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2191 { \
2192         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2193                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2194 } \
2195 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2196 { \
2197         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2198                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2199 } \
2200 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2201 { \
2202         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2203                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2204 }
2205
2206 EXTN_FEATURE_FUNCS(2)
2207 EXTN_FEATURE_FUNCS(3)
2208 EXTN_FEATURE_FUNCS(4)
2209
2210 static inline bool ext4_has_compat_features(struct super_block *sb)
2211 {
2212         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2213 }
2214 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2215 {
2216         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2217 }
2218 static inline bool ext4_has_incompat_features(struct super_block *sb)
2219 {
2220         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2221 }
2222
2223 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2224
2225 /*
2226  * Superblock flags
2227  */
2228 #define EXT4_FLAGS_RESIZING     0
2229 #define EXT4_FLAGS_SHUTDOWN     1
2230 #define EXT4_FLAGS_BDEV_IS_DAX  2
2231
2232 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2233 {
2234         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2235 }
2236
2237 /*
2238  * Default values for user and/or group using reserved blocks
2239  */
2240 #define EXT4_DEF_RESUID         0
2241 #define EXT4_DEF_RESGID         0
2242
2243 /*
2244  * Default project ID
2245  */
2246 #define EXT4_DEF_PROJID         0
2247
2248 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2249
2250 /*
2251  * Default mount options
2252  */
2253 #define EXT4_DEFM_DEBUG         0x0001
2254 #define EXT4_DEFM_BSDGROUPS     0x0002
2255 #define EXT4_DEFM_XATTR_USER    0x0004
2256 #define EXT4_DEFM_ACL           0x0008
2257 #define EXT4_DEFM_UID16         0x0010
2258 #define EXT4_DEFM_JMODE         0x0060
2259 #define EXT4_DEFM_JMODE_DATA    0x0020
2260 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2261 #define EXT4_DEFM_JMODE_WBACK   0x0060
2262 #define EXT4_DEFM_NOBARRIER     0x0100
2263 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2264 #define EXT4_DEFM_DISCARD       0x0400
2265 #define EXT4_DEFM_NODELALLOC    0x0800
2266
2267 /*
2268  * Default journal batch times
2269  */
2270 #define EXT4_DEF_MIN_BATCH_TIME 0
2271 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2272
2273 /*
2274  * Minimum number of groups in a flexgroup before we separate out
2275  * directories into the first block group of a flexgroup
2276  */
2277 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2278
2279 /*
2280  * Structure of a directory entry
2281  */
2282 #define EXT4_NAME_LEN 255
2283 /*
2284  * Base length of the ext4 directory entry excluding the name length
2285  */
2286 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2287
2288 struct ext4_dir_entry {
2289         __le32  inode;                  /* Inode number */
2290         __le16  rec_len;                /* Directory entry length */
2291         __le16  name_len;               /* Name length */
2292         char    name[EXT4_NAME_LEN];    /* File name */
2293 };
2294
2295
2296 /*
2297  * Encrypted Casefolded entries require saving the hash on disk. This structure
2298  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2299  * boundary.
2300  */
2301 struct ext4_dir_entry_hash {
2302         __le32 hash;
2303         __le32 minor_hash;
2304 };
2305
2306 /*
2307  * The new version of the directory entry.  Since EXT4 structures are
2308  * stored in intel byte order, and the name_len field could never be
2309  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2310  * file_type field.
2311  */
2312 struct ext4_dir_entry_2 {
2313         __le32  inode;                  /* Inode number */
2314         __le16  rec_len;                /* Directory entry length */
2315         __u8    name_len;               /* Name length */
2316         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2317         char    name[EXT4_NAME_LEN];    /* File name */
2318 };
2319
2320 /*
2321  * Access the hashes at the end of ext4_dir_entry_2
2322  */
2323 #define EXT4_DIRENT_HASHES(entry) \
2324         ((struct ext4_dir_entry_hash *) \
2325                 (((void *)(entry)) + \
2326                 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2327 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2328 #define EXT4_DIRENT_MINOR_HASH(entry) \
2329                 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2330
2331 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2332 {
2333         return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2334 }
2335
2336 /*
2337  * This is a bogus directory entry at the end of each leaf block that
2338  * records checksums.
2339  */
2340 struct ext4_dir_entry_tail {
2341         __le32  det_reserved_zero1;     /* Pretend to be unused */
2342         __le16  det_rec_len;            /* 12 */
2343         __u8    det_reserved_zero2;     /* Zero name length */
2344         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2345         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2346 };
2347
2348 #define EXT4_DIRENT_TAIL(block, blocksize) \
2349         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2350                                         ((blocksize) - \
2351                                          sizeof(struct ext4_dir_entry_tail))))
2352
2353 /*
2354  * Ext4 directory file types.  Only the low 3 bits are used.  The
2355  * other bits are reserved for now.
2356  */
2357 #define EXT4_FT_UNKNOWN         0
2358 #define EXT4_FT_REG_FILE        1
2359 #define EXT4_FT_DIR             2
2360 #define EXT4_FT_CHRDEV          3
2361 #define EXT4_FT_BLKDEV          4
2362 #define EXT4_FT_FIFO            5
2363 #define EXT4_FT_SOCK            6
2364 #define EXT4_FT_SYMLINK         7
2365
2366 #define EXT4_FT_MAX             8
2367
2368 #define EXT4_FT_DIR_CSUM        0xDE
2369
2370 /*
2371  * EXT4_DIR_PAD defines the directory entries boundaries
2372  *
2373  * NOTE: It must be a multiple of 4
2374  */
2375 #define EXT4_DIR_PAD                    4
2376 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2377 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2378
2379 /*
2380  * The rec_len is dependent on the type of directory. Directories that are
2381  * casefolded and encrypted need to store the hash as well, so we add room for
2382  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2383  * pass NULL for dir, as those entries do not use the extra fields.
2384  */
2385 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2386                                                 const struct inode *dir)
2387 {
2388         int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2389
2390         if (dir && ext4_hash_in_dirent(dir))
2391                 rec_len += sizeof(struct ext4_dir_entry_hash);
2392         return (rec_len & ~EXT4_DIR_ROUND);
2393 }
2394
2395 /*
2396  * If we ever get support for fs block sizes > page_size, we'll need
2397  * to remove the #if statements in the next two functions...
2398  */
2399 static inline unsigned int
2400 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2401 {
2402         unsigned len = le16_to_cpu(dlen);
2403
2404 #if (PAGE_SIZE >= 65536)
2405         if (len == EXT4_MAX_REC_LEN || len == 0)
2406                 return blocksize;
2407         return (len & 65532) | ((len & 3) << 16);
2408 #else
2409         return len;
2410 #endif
2411 }
2412
2413 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2414 {
2415         BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2416 #if (PAGE_SIZE >= 65536)
2417         if (len < 65536)
2418                 return cpu_to_le16(len);
2419         if (len == blocksize) {
2420                 if (blocksize == 65536)
2421                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2422                 else
2423                         return cpu_to_le16(0);
2424         }
2425         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2426 #else
2427         return cpu_to_le16(len);
2428 #endif
2429 }
2430
2431 /*
2432  * Hash Tree Directory indexing
2433  * (c) Daniel Phillips, 2001
2434  */
2435
2436 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2437                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2438 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2439                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2440 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2441
2442 /* Legal values for the dx_root hash_version field: */
2443
2444 #define DX_HASH_LEGACY                  0
2445 #define DX_HASH_HALF_MD4                1
2446 #define DX_HASH_TEA                     2
2447 #define DX_HASH_LEGACY_UNSIGNED         3
2448 #define DX_HASH_HALF_MD4_UNSIGNED       4
2449 #define DX_HASH_TEA_UNSIGNED            5
2450 #define DX_HASH_SIPHASH                 6
2451
2452 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2453                               const void *address, unsigned int length)
2454 {
2455         struct {
2456                 struct shash_desc shash;
2457                 char ctx[4];
2458         } desc;
2459
2460         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2461
2462         desc.shash.tfm = sbi->s_chksum_driver;
2463         *(u32 *)desc.ctx = crc;
2464
2465         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2466
2467         return *(u32 *)desc.ctx;
2468 }
2469
2470 #ifdef __KERNEL__
2471
2472 /* hash info structure used by the directory hash */
2473 struct dx_hash_info
2474 {
2475         u32             hash;
2476         u32             minor_hash;
2477         int             hash_version;
2478         u32             *seed;
2479 };
2480
2481
2482 /* 32 and 64 bit signed EOF for dx directories */
2483 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2484 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2485
2486
2487 /*
2488  * Control parameters used by ext4_htree_next_block
2489  */
2490 #define HASH_NB_ALWAYS          1
2491
2492 struct ext4_filename {
2493         const struct qstr *usr_fname;
2494         struct fscrypt_str disk_name;
2495         struct dx_hash_info hinfo;
2496 #ifdef CONFIG_FS_ENCRYPTION
2497         struct fscrypt_str crypto_buf;
2498 #endif
2499 #if IS_ENABLED(CONFIG_UNICODE)
2500         struct fscrypt_str cf_name;
2501 #endif
2502 };
2503
2504 #define fname_name(p) ((p)->disk_name.name)
2505 #define fname_usr_name(p) ((p)->usr_fname->name)
2506 #define fname_len(p)  ((p)->disk_name.len)
2507
2508 /*
2509  * Describe an inode's exact location on disk and in memory
2510  */
2511 struct ext4_iloc
2512 {
2513         struct buffer_head *bh;
2514         unsigned long offset;
2515         ext4_group_t block_group;
2516 };
2517
2518 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2519 {
2520         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2521 }
2522
2523 static inline bool ext4_is_quota_file(struct inode *inode)
2524 {
2525         return IS_NOQUOTA(inode) &&
2526                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2527 }
2528
2529 /*
2530  * This structure is stuffed into the struct file's private_data field
2531  * for directories.  It is where we put information so that we can do
2532  * readdir operations in hash tree order.
2533  */
2534 struct dir_private_info {
2535         struct rb_root  root;
2536         struct rb_node  *curr_node;
2537         struct fname    *extra_fname;
2538         loff_t          last_pos;
2539         __u32           curr_hash;
2540         __u32           curr_minor_hash;
2541         __u32           next_hash;
2542 };
2543
2544 /* calculate the first block number of the group */
2545 static inline ext4_fsblk_t
2546 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2547 {
2548         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2549                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2550 }
2551
2552 /*
2553  * Special error return code only used by dx_probe() and its callers.
2554  */
2555 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2556
2557 /* htree levels for ext4 */
2558 #define EXT4_HTREE_LEVEL_COMPAT 2
2559 #define EXT4_HTREE_LEVEL        3
2560
2561 static inline int ext4_dir_htree_level(struct super_block *sb)
2562 {
2563         return ext4_has_feature_largedir(sb) ?
2564                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2565 }
2566
2567 /*
2568  * Timeout and state flag for lazy initialization inode thread.
2569  */
2570 #define EXT4_DEF_LI_WAIT_MULT                   10
2571 #define EXT4_DEF_LI_MAX_START_DELAY             5
2572 #define EXT4_LAZYINIT_QUIT                      0x0001
2573 #define EXT4_LAZYINIT_RUNNING                   0x0002
2574
2575 /*
2576  * Lazy inode table initialization info
2577  */
2578 struct ext4_lazy_init {
2579         unsigned long           li_state;
2580         struct list_head        li_request_list;
2581         struct mutex            li_list_mtx;
2582 };
2583
2584 enum ext4_li_mode {
2585         EXT4_LI_MODE_PREFETCH_BBITMAP,
2586         EXT4_LI_MODE_ITABLE,
2587 };
2588
2589 struct ext4_li_request {
2590         struct super_block      *lr_super;
2591         enum ext4_li_mode       lr_mode;
2592         ext4_group_t            lr_first_not_zeroed;
2593         ext4_group_t            lr_next_group;
2594         struct list_head        lr_request;
2595         unsigned long           lr_next_sched;
2596         unsigned long           lr_timeout;
2597 };
2598
2599 struct ext4_features {
2600         struct kobject f_kobj;
2601         struct completion f_kobj_unregister;
2602 };
2603
2604 /*
2605  * This structure will be used for multiple mount protection. It will be
2606  * written into the block number saved in the s_mmp_block field in the
2607  * superblock. Programs that check MMP should assume that if
2608  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2609  * to use the filesystem, regardless of how old the timestamp is.
2610  */
2611 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2612 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2613 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2614 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2615
2616 struct mmp_struct {
2617         __le32  mmp_magic;              /* Magic number for MMP */
2618         __le32  mmp_seq;                /* Sequence no. updated periodically */
2619
2620         /*
2621          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2622          * purposes and do not affect the correctness of the algorithm
2623          */
2624         __le64  mmp_time;               /* Time last updated */
2625         char    mmp_nodename[64];       /* Node which last updated MMP block */
2626         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2627
2628         /*
2629          * mmp_check_interval is used to verify if the MMP block has been
2630          * updated on the block device. The value is updated based on the
2631          * maximum time to write the MMP block during an update cycle.
2632          */
2633         __le16  mmp_check_interval;
2634
2635         __le16  mmp_pad1;
2636         __le32  mmp_pad2[226];
2637         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2638 };
2639
2640 /* arguments passed to the mmp thread */
2641 struct mmpd_data {
2642         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2643         struct super_block *sb;  /* super block of the fs */
2644 };
2645
2646 /*
2647  * Check interval multiplier
2648  * The MMP block is written every update interval and initially checked every
2649  * update interval x the multiplier (the value is then adapted based on the
2650  * write latency). The reason is that writes can be delayed under load and we
2651  * don't want readers to incorrectly assume that the filesystem is no longer
2652  * in use.
2653  */
2654 #define EXT4_MMP_CHECK_MULT             2UL
2655
2656 /*
2657  * Minimum interval for MMP checking in seconds.
2658  */
2659 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2660
2661 /*
2662  * Maximum interval for MMP checking in seconds.
2663  */
2664 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2665
2666 /*
2667  * Function prototypes
2668  */
2669
2670 /*
2671  * Ok, these declarations are also in <linux/kernel.h> but none of the
2672  * ext4 source programs needs to include it so they are duplicated here.
2673  */
2674 # define NORET_TYPE     /**/
2675 # define ATTRIB_NORET   __attribute__((noreturn))
2676 # define NORET_AND      noreturn,
2677
2678 /* bitmap.c */
2679 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2680 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2681                                 struct ext4_group_desc *gdp,
2682                                 struct buffer_head *bh, int sz);
2683 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2684                                   struct ext4_group_desc *gdp,
2685                                   struct buffer_head *bh, int sz);
2686 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2687                                 struct ext4_group_desc *gdp,
2688                                 struct buffer_head *bh);
2689 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2690                                   struct ext4_group_desc *gdp,
2691                                   struct buffer_head *bh);
2692
2693 /* balloc.c */
2694 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2695                                          ext4_fsblk_t blocknr,
2696                                          ext4_group_t *blockgrpp,
2697                                          ext4_grpblk_t *offsetp);
2698 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2699                                           ext4_fsblk_t block);
2700
2701 extern unsigned int ext4_block_group(struct super_block *sb,
2702                         ext4_fsblk_t blocknr);
2703 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2704                         ext4_fsblk_t blocknr);
2705 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2706 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2707                         ext4_group_t group);
2708 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2709                                          ext4_fsblk_t goal,
2710                                          unsigned int flags,
2711                                          unsigned long *count,
2712                                          int *errp);
2713 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2714                                     s64 nclusters, unsigned int flags);
2715 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2716 extern void ext4_check_blocks_bitmap(struct super_block *);
2717 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2718                                                     ext4_group_t block_group,
2719                                                     struct buffer_head ** bh);
2720 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2721
2722 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2723                                                 ext4_group_t block_group,
2724                                                 bool ignore_locked);
2725 extern int ext4_wait_block_bitmap(struct super_block *sb,
2726                                   ext4_group_t block_group,
2727                                   struct buffer_head *bh);
2728 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2729                                                   ext4_group_t block_group);
2730 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2731                                               ext4_group_t block_group,
2732                                               struct ext4_group_desc *gdp);
2733 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2734
2735 #if IS_ENABLED(CONFIG_UNICODE)
2736 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2737                                          const struct qstr *iname,
2738                                          struct ext4_filename *fname);
2739 #endif
2740
2741 /* ext4 encryption related stuff goes here crypto.c */
2742 #ifdef CONFIG_FS_ENCRYPTION
2743 extern const struct fscrypt_operations ext4_cryptops;
2744
2745 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2746                               int lookup, struct ext4_filename *fname);
2747
2748 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2749                               struct ext4_filename *fname);
2750
2751 void ext4_fname_free_filename(struct ext4_filename *fname);
2752
2753 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2754
2755 #else /* !CONFIG_FS_ENCRYPTION */
2756 static inline int ext4_fname_setup_filename(struct inode *dir,
2757                                             const struct qstr *iname,
2758                                             int lookup,
2759                                             struct ext4_filename *fname)
2760 {
2761         int err = 0;
2762         fname->usr_fname = iname;
2763         fname->disk_name.name = (unsigned char *) iname->name;
2764         fname->disk_name.len = iname->len;
2765
2766 #if IS_ENABLED(CONFIG_UNICODE)
2767         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2768 #endif
2769
2770         return err;
2771 }
2772
2773 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2774                                             struct dentry *dentry,
2775                                             struct ext4_filename *fname)
2776 {
2777         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2778 }
2779
2780 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2781 {
2782 #if IS_ENABLED(CONFIG_UNICODE)
2783         kfree(fname->cf_name.name);
2784         fname->cf_name.name = NULL;
2785 #endif
2786 }
2787
2788 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2789                                                    void __user *arg)
2790 {
2791         return -EOPNOTSUPP;
2792 }
2793 #endif /* !CONFIG_FS_ENCRYPTION */
2794
2795 /* dir.c */
2796 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2797                                   struct file *,
2798                                   struct ext4_dir_entry_2 *,
2799                                   struct buffer_head *, char *, int,
2800                                   unsigned int);
2801 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2802         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2803                                 (de), (bh), (buf), (size), (offset)))
2804 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2805                                 __u32 minor_hash,
2806                                 struct ext4_dir_entry_2 *dirent,
2807                                 struct fscrypt_str *ent_name);
2808 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2809 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2810                              struct buffer_head *bh,
2811                              void *buf, int buf_size,
2812                              struct ext4_filename *fname,
2813                              struct ext4_dir_entry_2 **dest_de);
2814 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2815                         struct ext4_dir_entry_2 *de,
2816                         int buf_size,
2817                         struct ext4_filename *fname);
2818 static inline void ext4_update_dx_flag(struct inode *inode)
2819 {
2820         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2821             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2822                 /* ext4_iget() should have caught this... */
2823                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2824                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2825         }
2826 }
2827 static const unsigned char ext4_filetype_table[] = {
2828         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2829 };
2830
2831 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2832 {
2833         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2834                 return DT_UNKNOWN;
2835
2836         return ext4_filetype_table[filetype];
2837 }
2838 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2839                              void *buf, int buf_size);
2840
2841 /* fsync.c */
2842 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2843
2844 /* hash.c */
2845 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2846                           struct dx_hash_info *hinfo);
2847
2848 /* ialloc.c */
2849 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2850 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2851                                       struct inode *, umode_t,
2852                                       const struct qstr *qstr, __u32 goal,
2853                                       uid_t *owner, __u32 i_flags,
2854                                       int handle_type, unsigned int line_no,
2855                                       int nblocks);
2856
2857 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2858         __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2859                          (goal), (owner), i_flags, 0, 0, 0)
2860 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2861                                     type, nblocks)                  \
2862         __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2863                          0, (type), __LINE__, (nblocks))
2864
2865
2866 extern void ext4_free_inode(handle_t *, struct inode *);
2867 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2868 extern unsigned long ext4_count_free_inodes(struct super_block *);
2869 extern unsigned long ext4_count_dirs(struct super_block *);
2870 extern void ext4_check_inodes_bitmap(struct super_block *);
2871 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2872 extern int ext4_init_inode_table(struct super_block *sb,
2873                                  ext4_group_t group, int barrier);
2874 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2875
2876 /* fast_commit.c */
2877 int ext4_fc_info_show(struct seq_file *seq, void *v);
2878 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2879 void ext4_fc_init_inode(struct inode *inode);
2880 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2881                          ext4_lblk_t end);
2882 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2883         struct dentry *dentry);
2884 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2885         struct dentry *dentry);
2886 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2887 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2888 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2889                             struct dentry *dentry);
2890 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2891 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2892 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2893 void ext4_fc_start_update(struct inode *inode);
2894 void ext4_fc_stop_update(struct inode *inode);
2895 void ext4_fc_del(struct inode *inode);
2896 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2897 void ext4_fc_replay_cleanup(struct super_block *sb);
2898 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2899 int __init ext4_fc_init_dentry_cache(void);
2900 void ext4_fc_destroy_dentry_cache(void);
2901 int ext4_fc_record_regions(struct super_block *sb, int ino,
2902                            ext4_lblk_t lblk, ext4_fsblk_t pblk,
2903                            int len, int replay);
2904
2905 /* mballoc.c */
2906 extern const struct seq_operations ext4_mb_seq_groups_ops;
2907 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2908 extern long ext4_mb_stats;
2909 extern long ext4_mb_max_to_scan;
2910 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2911 extern int ext4_mb_init(struct super_block *);
2912 extern int ext4_mb_release(struct super_block *);
2913 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2914                                 struct ext4_allocation_request *, int *);
2915 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2916 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2917 extern int __init ext4_init_mballoc(void);
2918 extern void ext4_exit_mballoc(void);
2919 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2920                                      ext4_group_t group,
2921                                      unsigned int nr, int *cnt);
2922 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2923                                   unsigned int nr);
2924
2925 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2926                              struct buffer_head *bh, ext4_fsblk_t block,
2927                              unsigned long count, int flags);
2928 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2929                                    ext4_group_t ngroups);
2930 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2931                 ext4_group_t i, struct ext4_group_desc *desc);
2932 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2933                                 ext4_fsblk_t block, unsigned long count);
2934 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2935 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2936 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2937                        int len, int state);
2938
2939 /* inode.c */
2940 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2941                          struct ext4_inode_info *ei);
2942 int ext4_inode_is_fast_symlink(struct inode *inode);
2943 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2944 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2945 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2946                      bool wait, struct buffer_head **bhs);
2947 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2948                              struct buffer_head *bh_result, int create);
2949 int ext4_get_block(struct inode *inode, sector_t iblock,
2950                    struct buffer_head *bh_result, int create);
2951 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2952                            struct buffer_head *bh, int create);
2953 int ext4_walk_page_buffers(handle_t *handle,
2954                            struct inode *inode,
2955                            struct buffer_head *head,
2956                            unsigned from,
2957                            unsigned to,
2958                            int *partial,
2959                            int (*fn)(handle_t *handle, struct inode *inode,
2960                                      struct buffer_head *bh));
2961 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2962                                 struct buffer_head *bh);
2963 #define FALL_BACK_TO_NONDELALLOC 1
2964 #define CONVERT_INLINE_DATA      2
2965
2966 typedef enum {
2967         EXT4_IGET_NORMAL =      0,
2968         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
2969         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
2970 } ext4_iget_flags;
2971
2972 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2973                                  ext4_iget_flags flags, const char *function,
2974                                  unsigned int line);
2975
2976 #define ext4_iget(sb, ino, flags) \
2977         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2978
2979 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
2980 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
2981                          struct iattr *);
2982 extern int  ext4_getattr(struct user_namespace *, const struct path *,
2983                          struct kstat *, u32, unsigned int);
2984 extern void ext4_evict_inode(struct inode *);
2985 extern void ext4_clear_inode(struct inode *);
2986 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
2987                               struct kstat *, u32, unsigned int);
2988 extern int  ext4_sync_inode(handle_t *, struct inode *);
2989 extern void ext4_dirty_inode(struct inode *, int);
2990 extern int ext4_change_inode_journal_flag(struct inode *, int);
2991 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2992 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2993                           struct ext4_iloc *iloc);
2994 extern int ext4_inode_attach_jinode(struct inode *inode);
2995 extern int ext4_can_truncate(struct inode *inode);
2996 extern int ext4_truncate(struct inode *);
2997 extern int ext4_break_layouts(struct inode *);
2998 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2999 extern void ext4_set_inode_flags(struct inode *, bool init);
3000 extern int ext4_alloc_da_blocks(struct inode *inode);
3001 extern void ext4_set_aops(struct inode *inode);
3002 extern int ext4_writepage_trans_blocks(struct inode *);
3003 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3004 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3005                              loff_t lstart, loff_t lend);
3006 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3007 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3008 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3009 extern void ext4_da_release_space(struct inode *inode, int to_free);
3010 extern void ext4_da_update_reserve_space(struct inode *inode,
3011                                         int used, int quota_claim);
3012 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3013                               ext4_fsblk_t pblk, ext4_lblk_t len);
3014
3015 /* indirect.c */
3016 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3017                                 struct ext4_map_blocks *map, int flags);
3018 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3019 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3020 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3021                                  ext4_lblk_t start, ext4_lblk_t end);
3022
3023 /* ioctl.c */
3024 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3025 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3026 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3027                       struct dentry *dentry, struct fileattr *fa);
3028 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3029 extern void ext4_reset_inode_seed(struct inode *inode);
3030 int ext4_update_overhead(struct super_block *sb, bool force);
3031
3032 /* migrate.c */
3033 extern int ext4_ext_migrate(struct inode *);
3034 extern int ext4_ind_migrate(struct inode *inode);
3035
3036 /* namei.c */
3037 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3038                              struct inode *inode);
3039 extern int ext4_dirblock_csum_verify(struct inode *inode,
3040                                      struct buffer_head *bh);
3041 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3042                                 __u32 start_minor_hash, __u32 *next_hash);
3043 extern int ext4_search_dir(struct buffer_head *bh,
3044                            char *search_buf,
3045                            int buf_size,
3046                            struct inode *dir,
3047                            struct ext4_filename *fname,
3048                            unsigned int offset,
3049                            struct ext4_dir_entry_2 **res_dir);
3050 extern int ext4_generic_delete_entry(struct inode *dir,
3051                                      struct ext4_dir_entry_2 *de_del,
3052                                      struct buffer_head *bh,
3053                                      void *entry_buf,
3054                                      int buf_size,
3055                                      int csum_size);
3056 extern bool ext4_empty_dir(struct inode *inode);
3057
3058 /* resize.c */
3059 extern void ext4_kvfree_array_rcu(void *to_free);
3060 extern int ext4_group_add(struct super_block *sb,
3061                                 struct ext4_new_group_data *input);
3062 extern int ext4_group_extend(struct super_block *sb,
3063                                 struct ext4_super_block *es,
3064                                 ext4_fsblk_t n_blocks_count);
3065 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3066 extern unsigned int ext4_list_backups(struct super_block *sb,
3067                                       unsigned int *three, unsigned int *five,
3068                                       unsigned int *seven);
3069
3070 /* super.c */
3071 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3072                                          sector_t block, int op_flags);
3073 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3074                                                    sector_t block);
3075 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3076                                 bh_end_io_t *end_io);
3077 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3078                         bh_end_io_t *end_io);
3079 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3080 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3081 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3082 extern int ext4_calculate_overhead(struct super_block *sb);
3083 extern __le32 ext4_superblock_csum(struct super_block *sb,
3084                                    struct ext4_super_block *es);
3085 extern void ext4_superblock_csum_set(struct super_block *sb);
3086 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3087                                     ext4_group_t ngroup);
3088 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3089                                      char nbuf[16]);
3090 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3091                                              ext4_group_t block_group,
3092                                              unsigned int flags);
3093
3094 extern __printf(7, 8)
3095 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3096                   int, __u64, const char *, ...);
3097 extern __printf(6, 7)
3098 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3099                         ext4_fsblk_t, int, const char *, ...);
3100 extern __printf(5, 6)
3101 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3102                      const char *, ...);
3103 extern void __ext4_std_error(struct super_block *, const char *,
3104                              unsigned int, int);
3105 extern __printf(4, 5)
3106 void __ext4_warning(struct super_block *, const char *, unsigned int,
3107                     const char *, ...);
3108 extern __printf(4, 5)
3109 void __ext4_warning_inode(const struct inode *inode, const char *function,
3110                           unsigned int line, const char *fmt, ...);
3111 extern __printf(3, 4)
3112 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3113 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3114                            const char *, unsigned int, const char *);
3115 extern __printf(7, 8)
3116 void __ext4_grp_locked_error(const char *, unsigned int,
3117                              struct super_block *, ext4_group_t,
3118                              unsigned long, ext4_fsblk_t,
3119                              const char *, ...);
3120
3121 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3122         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3123
3124 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3125         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3126
3127 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3128         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3129                            (fmt), ## a)
3130
3131 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3132         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3133
3134 #define ext4_abort(sb, err, fmt, a...)                                  \
3135         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3136
3137 #ifdef CONFIG_PRINTK
3138
3139 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3140         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3141 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3142         __ext4_error_inode((inode), (func), (line), (block),            \
3143                            (err), (fmt), ##__VA_ARGS__)
3144 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3145         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3146 #define ext4_error(sb, fmt, ...)                                        \
3147         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3148                 ##__VA_ARGS__)
3149 #define ext4_error_err(sb, err, fmt, ...)                               \
3150         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3151                 ##__VA_ARGS__)
3152 #define ext4_warning(sb, fmt, ...)                                      \
3153         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3154 #define ext4_warning_inode(inode, fmt, ...)                             \
3155         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3156 #define ext4_msg(sb, level, fmt, ...)                           \
3157         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3158 #define dump_mmp_msg(sb, mmp, msg)                                      \
3159         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3160 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3161         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3162                                 fmt, ##__VA_ARGS__)
3163
3164 #else
3165
3166 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3167 do {                                                                    \
3168         no_printk(fmt, ##__VA_ARGS__);                                  \
3169         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3170 } while (0)
3171 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3172 do {                                                                    \
3173         no_printk(fmt, ##__VA_ARGS__);                                  \
3174         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3175 } while (0)
3176 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3177 do {                                                                    \
3178         no_printk(fmt, ##__VA_ARGS__);                                  \
3179         __ext4_error_file(file, "", 0, block, " ");                     \
3180 } while (0)
3181 #define ext4_error(sb, fmt, ...)                                        \
3182 do {                                                                    \
3183         no_printk(fmt, ##__VA_ARGS__);                                  \
3184         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3185 } while (0)
3186 #define ext4_error_err(sb, err, fmt, ...)                               \
3187 do {                                                                    \
3188         no_printk(fmt, ##__VA_ARGS__);                                  \
3189         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3190 } while (0)
3191 #define ext4_warning(sb, fmt, ...)                                      \
3192 do {                                                                    \
3193         no_printk(fmt, ##__VA_ARGS__);                                  \
3194         __ext4_warning(sb, "", 0, " ");                                 \
3195 } while (0)
3196 #define ext4_warning_inode(inode, fmt, ...)                             \
3197 do {                                                                    \
3198         no_printk(fmt, ##__VA_ARGS__);                                  \
3199         __ext4_warning_inode(inode, "", 0, " ");                        \
3200 } while (0)
3201 #define ext4_msg(sb, level, fmt, ...)                                   \
3202 do {                                                                    \
3203         no_printk(fmt, ##__VA_ARGS__);                                  \
3204         __ext4_msg(sb, "", " ");                                        \
3205 } while (0)
3206 #define dump_mmp_msg(sb, mmp, msg)                                      \
3207         __dump_mmp_msg(sb, mmp, "", 0, "")
3208 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3209 do {                                                                    \
3210         no_printk(fmt, ##__VA_ARGS__);                          \
3211         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3212 } while (0)
3213
3214 #endif
3215
3216 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3217                                       struct ext4_group_desc *bg);
3218 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3219                                       struct ext4_group_desc *bg);
3220 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3221                                      struct ext4_group_desc *bg);
3222 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3223                                       struct ext4_group_desc *bg);
3224 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3225                                  struct ext4_group_desc *bg);
3226 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3227                                 struct ext4_group_desc *bg);
3228 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3229                                    struct ext4_group_desc *bg);
3230 extern void ext4_block_bitmap_set(struct super_block *sb,
3231                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3232 extern void ext4_inode_bitmap_set(struct super_block *sb,
3233                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3234 extern void ext4_inode_table_set(struct super_block *sb,
3235                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3236 extern void ext4_free_group_clusters_set(struct super_block *sb,
3237                                          struct ext4_group_desc *bg,
3238                                          __u32 count);
3239 extern void ext4_free_inodes_set(struct super_block *sb,
3240                                 struct ext4_group_desc *bg, __u32 count);
3241 extern void ext4_used_dirs_set(struct super_block *sb,
3242                                 struct ext4_group_desc *bg, __u32 count);
3243 extern void ext4_itable_unused_set(struct super_block *sb,
3244                                    struct ext4_group_desc *bg, __u32 count);
3245 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3246                                        struct ext4_group_desc *gdp);
3247 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3248                                      struct ext4_group_desc *gdp);
3249 extern int ext4_register_li_request(struct super_block *sb,
3250                                     ext4_group_t first_not_zeroed);
3251
3252 static inline int ext4_has_metadata_csum(struct super_block *sb)
3253 {
3254         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3255                      !EXT4_SB(sb)->s_chksum_driver);
3256
3257         return ext4_has_feature_metadata_csum(sb) &&
3258                (EXT4_SB(sb)->s_chksum_driver != NULL);
3259 }
3260
3261 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3262 {
3263         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3264 }
3265
3266 #define ext4_read_incompat_64bit_val(es, name) \
3267         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3268                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3269                 le32_to_cpu(es->name##_lo))
3270
3271 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3272 {
3273         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3274 }
3275
3276 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3277 {
3278         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3279 }
3280
3281 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3282 {
3283         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3284 }
3285
3286 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3287                                          ext4_fsblk_t blk)
3288 {
3289         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3290         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3291 }
3292
3293 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3294                                               ext4_fsblk_t blk)
3295 {
3296         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3297         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3298 }
3299
3300 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3301                                            ext4_fsblk_t blk)
3302 {
3303         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3304         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3305 }
3306
3307 static inline loff_t ext4_isize(struct super_block *sb,
3308                                 struct ext4_inode *raw_inode)
3309 {
3310         if (ext4_has_feature_largedir(sb) ||
3311             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3312                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3313                         le32_to_cpu(raw_inode->i_size_lo);
3314
3315         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3316 }
3317
3318 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3319 {
3320         raw_inode->i_size_lo = cpu_to_le32(i_size);
3321         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3322 }
3323
3324 static inline
3325 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3326                                             ext4_group_t group)
3327 {
3328          struct ext4_group_info **grp_info;
3329          long indexv, indexh;
3330          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3331          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3332          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3333          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3334          return grp_info[indexh];
3335 }
3336
3337 /*
3338  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3339  * the locking protocol documented in the comments of ext4_group_add()
3340  * in resize.c
3341  */
3342 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3343 {
3344         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3345
3346         smp_rmb();
3347         return ngroups;
3348 }
3349
3350 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3351                                              ext4_group_t block_group)
3352 {
3353         return block_group >> sbi->s_log_groups_per_flex;
3354 }
3355
3356 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3357 {
3358         return 1 << sbi->s_log_groups_per_flex;
3359 }
3360
3361 #define ext4_std_error(sb, errno)                               \
3362 do {                                                            \
3363         if ((errno))                                            \
3364                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3365 } while (0)
3366
3367 #ifdef CONFIG_SMP
3368 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3369  * counters. So we need to make sure we have free clusters more
3370  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3371  */
3372 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3373 #else
3374 #define EXT4_FREECLUSTERS_WATERMARK 0
3375 #endif
3376
3377 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3378 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3379 {
3380         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3381                      !inode_is_locked(inode));
3382         down_write(&EXT4_I(inode)->i_data_sem);
3383         if (newsize > EXT4_I(inode)->i_disksize)
3384                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3385         up_write(&EXT4_I(inode)->i_data_sem);
3386 }
3387
3388 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3389 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3390 {
3391         int changed = 0;
3392
3393         if (newsize > inode->i_size) {
3394                 i_size_write(inode, newsize);
3395                 changed = 1;
3396         }
3397         if (newsize > EXT4_I(inode)->i_disksize) {
3398                 ext4_update_i_disksize(inode, newsize);
3399                 changed |= 2;
3400         }
3401         return changed;
3402 }
3403
3404 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3405                                       loff_t len);
3406
3407 struct ext4_group_info {
3408         unsigned long   bb_state;
3409 #ifdef AGGRESSIVE_CHECK
3410         unsigned long   bb_check_counter;
3411 #endif
3412         struct rb_root  bb_free_root;
3413         ext4_grpblk_t   bb_first_free;  /* first free block */
3414         ext4_grpblk_t   bb_free;        /* total free blocks */
3415         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3416         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3417         ext4_group_t    bb_group;       /* Group number */
3418         struct          list_head bb_prealloc_list;
3419 #ifdef DOUBLE_CHECK
3420         void            *bb_bitmap;
3421 #endif
3422         struct rw_semaphore alloc_sem;
3423         struct rb_node  bb_avg_fragment_size_rb;
3424         struct list_head bb_largest_free_order_node;
3425         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3426                                          * regions, index is order.
3427                                          * bb_counters[3] = 5 means
3428                                          * 5 free 8-block regions. */
3429 };
3430
3431 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3432 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3433 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3434 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3435 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3436         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3437 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3438         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3439 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3440
3441 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3442         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3443 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3444         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3445 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3446         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3447
3448 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3449         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3450 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3451         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3452 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3453         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3454 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3455         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3456
3457 #define EXT4_MAX_CONTENTION             8
3458 #define EXT4_CONTENTION_THRESHOLD       2
3459
3460 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3461                                               ext4_group_t group)
3462 {
3463         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3464 }
3465
3466 /*
3467  * Returns true if the filesystem is busy enough that attempts to
3468  * access the block group locks has run into contention.
3469  */
3470 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3471 {
3472         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3473 }
3474
3475 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3476 {
3477         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3478         if (spin_trylock(lock))
3479                 /*
3480                  * We're able to grab the lock right away, so drop the
3481                  * lock contention counter.
3482                  */
3483                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3484         else {
3485                 /*
3486                  * The lock is busy, so bump the contention counter,
3487                  * and then wait on the spin lock.
3488                  */
3489                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3490                                   EXT4_MAX_CONTENTION);
3491                 spin_lock(lock);
3492         }
3493 }
3494
3495 static inline void ext4_unlock_group(struct super_block *sb,
3496                                         ext4_group_t group)
3497 {
3498         spin_unlock(ext4_group_lock_ptr(sb, group));
3499 }
3500
3501 #ifdef CONFIG_QUOTA
3502 static inline bool ext4_quota_capable(struct super_block *sb)
3503 {
3504         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3505 }
3506
3507 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3508 {
3509         struct ext4_sb_info *sbi = EXT4_SB(sb);
3510
3511         return (ext4_has_feature_quota(sb) ||
3512                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3513 }
3514 int ext4_enable_quotas(struct super_block *sb);
3515 #endif
3516
3517 /*
3518  * Block validity checking
3519  */
3520 #define ext4_check_indirect_blockref(inode, bh)                         \
3521         ext4_check_blockref(__func__, __LINE__, inode,                  \
3522                             (__le32 *)(bh)->b_data,                     \
3523                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3524
3525 #define ext4_ind_check_inode(inode)                                     \
3526         ext4_check_blockref(__func__, __LINE__, inode,                  \
3527                             EXT4_I(inode)->i_data,                      \
3528                             EXT4_NDIR_BLOCKS)
3529
3530 /*
3531  * Inodes and files operations
3532  */
3533
3534 /* dir.c */
3535 extern const struct file_operations ext4_dir_operations;
3536
3537 /* file.c */
3538 extern const struct inode_operations ext4_file_inode_operations;
3539 extern const struct file_operations ext4_file_operations;
3540 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3541
3542 /* inline.c */
3543 extern int ext4_get_max_inline_size(struct inode *inode);
3544 extern int ext4_find_inline_data_nolock(struct inode *inode);
3545 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3546                                  unsigned int len);
3547 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3548
3549 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3550 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3551                                          struct inode *inode,
3552                                          loff_t pos, unsigned len,
3553                                          struct page **pagep);
3554 extern int ext4_write_inline_data_end(struct inode *inode,
3555                                       loff_t pos, unsigned len,
3556                                       unsigned copied,
3557                                       struct page *page);
3558 extern struct buffer_head *
3559 ext4_journalled_write_inline_data(struct inode *inode,
3560                                   unsigned len,
3561                                   struct page *page);
3562 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3563                                            struct inode *inode,
3564                                            loff_t pos, unsigned len,
3565                                            struct page **pagep,
3566                                            void **fsdata);
3567 extern int ext4_try_add_inline_entry(handle_t *handle,
3568                                      struct ext4_filename *fname,
3569                                      struct inode *dir, struct inode *inode);
3570 extern int ext4_try_create_inline_dir(handle_t *handle,
3571                                       struct inode *parent,
3572                                       struct inode *inode);
3573 extern int ext4_read_inline_dir(struct file *filp,
3574                                 struct dir_context *ctx,
3575                                 int *has_inline_data);
3576 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3577                                   struct inode *dir, ext4_lblk_t block,
3578                                   struct dx_hash_info *hinfo,
3579                                   __u32 start_hash, __u32 start_minor_hash,
3580                                   int *has_inline_data);
3581 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3582                                         struct ext4_filename *fname,
3583                                         struct ext4_dir_entry_2 **res_dir,
3584                                         int *has_inline_data);
3585 extern int ext4_delete_inline_entry(handle_t *handle,
3586                                     struct inode *dir,
3587                                     struct ext4_dir_entry_2 *de_del,
3588                                     struct buffer_head *bh,
3589                                     int *has_inline_data);
3590 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3591 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3592                                         struct ext4_dir_entry_2 **parent_de,
3593                                         int *retval);
3594 extern int ext4_inline_data_fiemap(struct inode *inode,
3595                                    struct fiemap_extent_info *fieinfo,
3596                                    int *has_inline, __u64 start, __u64 len);
3597 extern void *ext4_read_inline_link(struct inode *inode);
3598
3599 struct iomap;
3600 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3601
3602 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3603
3604 extern int ext4_convert_inline_data(struct inode *inode);
3605
3606 static inline int ext4_has_inline_data(struct inode *inode)
3607 {
3608         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3609                EXT4_I(inode)->i_inline_off;
3610 }
3611
3612 /* namei.c */
3613 extern const struct inode_operations ext4_dir_inode_operations;
3614 extern const struct inode_operations ext4_special_inode_operations;
3615 extern struct dentry *ext4_get_parent(struct dentry *child);
3616 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3617                                  struct ext4_dir_entry_2 *de,
3618                                  int blocksize, int csum_size,
3619                                  unsigned int parent_ino, int dotdot_real_len);
3620 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3621                                         unsigned int blocksize);
3622 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3623                                       struct buffer_head *bh);
3624 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3625                          struct inode *inode);
3626 extern int __ext4_link(struct inode *dir, struct inode *inode,
3627                        struct dentry *dentry);
3628
3629 #define S_SHIFT 12
3630 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3631         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3632         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3633         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3634         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3635         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3636         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3637         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3638 };
3639
3640 static inline void ext4_set_de_type(struct super_block *sb,
3641                                 struct ext4_dir_entry_2 *de,
3642                                 umode_t mode) {
3643         if (ext4_has_feature_filetype(sb))
3644                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3645 }
3646
3647 /* readpages.c */
3648 extern int ext4_mpage_readpages(struct inode *inode,
3649                 struct readahead_control *rac, struct page *page);
3650 extern int __init ext4_init_post_read_processing(void);
3651 extern void ext4_exit_post_read_processing(void);
3652
3653 /* symlink.c */
3654 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3655 extern const struct inode_operations ext4_symlink_inode_operations;
3656 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3657
3658 /* sysfs.c */
3659 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3660 extern int ext4_register_sysfs(struct super_block *sb);
3661 extern void ext4_unregister_sysfs(struct super_block *sb);
3662 extern int __init ext4_init_sysfs(void);
3663 extern void ext4_exit_sysfs(void);
3664
3665 /* block_validity */
3666 extern void ext4_release_system_zone(struct super_block *sb);
3667 extern int ext4_setup_system_zone(struct super_block *sb);
3668 extern int __init ext4_init_system_zone(void);
3669 extern void ext4_exit_system_zone(void);
3670 extern int ext4_inode_block_valid(struct inode *inode,
3671                                   ext4_fsblk_t start_blk,
3672                                   unsigned int count);
3673 extern int ext4_check_blockref(const char *, unsigned int,
3674                                struct inode *, __le32 *, unsigned int);
3675 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3676                                 ext4_fsblk_t start_blk, unsigned int count);
3677
3678
3679 /* extents.c */
3680 struct ext4_ext_path;
3681 struct ext4_extent;
3682
3683 /*
3684  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3685  * __le32.
3686  */
3687 #define EXT_MAX_BLOCKS  0xffffffff
3688
3689 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3690 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3691 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3692                                struct ext4_map_blocks *map, int flags);
3693 extern int ext4_ext_truncate(handle_t *, struct inode *);
3694 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3695                                  ext4_lblk_t end);
3696 extern void ext4_ext_init(struct super_block *);
3697 extern void ext4_ext_release(struct super_block *);
3698 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3699                           loff_t len);
3700 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3701                                           loff_t offset, ssize_t len);
3702 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3703                                              ext4_io_end_t *io_end);
3704 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3705                            struct ext4_map_blocks *map, int flags);
3706 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3707                                                    int num,
3708                                                    struct ext4_ext_path *path);
3709 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3710                                   struct ext4_ext_path **,
3711                                   struct ext4_extent *, int);
3712 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3713                                               struct ext4_ext_path **,
3714                                               int flags);
3715 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3716 extern int ext4_ext_check_inode(struct inode *inode);
3717 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3718 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3719                         __u64 start, __u64 len);
3720 extern int ext4_get_es_cache(struct inode *inode,
3721                              struct fiemap_extent_info *fieinfo,
3722                              __u64 start, __u64 len);
3723 extern int ext4_ext_precache(struct inode *inode);
3724 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3725                                 struct inode *inode2, ext4_lblk_t lblk1,
3726                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3727                              int mark_unwritten,int *err);
3728 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3729 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3730                                        int check_cred, int restart_cred,
3731                                        int revoke_cred);
3732 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3733 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3734 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3735                 int len, int unwritten, ext4_fsblk_t pblk);
3736 extern int ext4_ext_clear_bb(struct inode *inode);
3737
3738
3739 /* move_extent.c */
3740 extern void ext4_double_down_write_data_sem(struct inode *first,
3741                                             struct inode *second);
3742 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3743                                           struct inode *donor_inode);
3744 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3745                              __u64 start_orig, __u64 start_donor,
3746                              __u64 len, __u64 *moved_len);
3747
3748 /* page-io.c */
3749 extern int __init ext4_init_pageio(void);
3750 extern void ext4_exit_pageio(void);
3751 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3752 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3753 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3754 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3755 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3756                                 struct writeback_control *wbc);
3757 extern void ext4_end_io_rsv_work(struct work_struct *work);
3758 extern void ext4_io_submit(struct ext4_io_submit *io);
3759 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3760                                struct page *page,
3761                                int len,
3762                                bool keep_towrite);
3763 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3764 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3765
3766 /* mmp.c */
3767 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3768
3769 /* mmp.c */
3770 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3771
3772 /* verity.c */
3773 extern const struct fsverity_operations ext4_verityops;
3774
3775 /* orphan.c */
3776 extern int ext4_orphan_add(handle_t *, struct inode *);
3777 extern int ext4_orphan_del(handle_t *, struct inode *);
3778 extern void ext4_orphan_cleanup(struct super_block *sb,
3779                                 struct ext4_super_block *es);
3780 extern void ext4_release_orphan_info(struct super_block *sb);
3781 extern int ext4_init_orphan_info(struct super_block *sb);
3782 extern int ext4_orphan_file_empty(struct super_block *sb);
3783 extern void ext4_orphan_file_block_trigger(
3784                                 struct jbd2_buffer_trigger_type *triggers,
3785                                 struct buffer_head *bh,
3786                                 void *data, size_t size);
3787
3788 /*
3789  * Add new method to test whether block and inode bitmaps are properly
3790  * initialized. With uninit_bg reading the block from disk is not enough
3791  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3792  */
3793 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3794
3795 static inline int bitmap_uptodate(struct buffer_head *bh)
3796 {
3797         return (buffer_uptodate(bh) &&
3798                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3799 }
3800 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3801 {
3802         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3803 }
3804
3805 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3806
3807 /* For ioend & aio unwritten conversion wait queues */
3808 #define EXT4_WQ_HASH_SZ         37
3809 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3810                                             EXT4_WQ_HASH_SZ])
3811 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3812
3813 extern int ext4_resize_begin(struct super_block *sb);
3814 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3815
3816 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3817                                               struct ext4_io_end *io_end)
3818 {
3819         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3820                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3821                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3822         }
3823 }
3824
3825 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3826 {
3827         struct inode *inode = io_end->inode;
3828
3829         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3830                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3831                 /* Wake up anyone waiting on unwritten extent conversion */
3832                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3833                         wake_up_all(ext4_ioend_wq(inode));
3834         }
3835 }
3836
3837 extern const struct iomap_ops ext4_iomap_ops;
3838 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3839 extern const struct iomap_ops ext4_iomap_report_ops;
3840
3841 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3842 {
3843         /*
3844          * If the buffer has the write error flag, we have failed
3845          * to write out data in the block.  In this  case, we don't
3846          * have to read the block because we may read the old data
3847          * successfully.
3848          */
3849         if (buffer_write_io_error(bh))
3850                 set_buffer_uptodate(bh);
3851         return buffer_uptodate(bh);
3852 }
3853
3854 #endif  /* __KERNEL__ */
3855
3856 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3857 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3858
3859 #endif  /* _EXT4_H */