fs/ext4/ext4.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ext4.h
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/include/linux/minix_fs.h
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  */
  16
  17 #ifndef _EXT4_H
  18 #define _EXT4_H
  19
  20 #include <linux/refcount.h>
  21 #include <linux/types.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/magic.h>
  24 #include <linux/jbd2.h>
  25 #include <linux/quota.h>
  26 #include <linux/rwsem.h>
  27 #include <linux/rbtree.h>
  28 #include <linux/seqlock.h>
  29 #include <linux/mutex.h>
  30 #include <linux/timer.h>
  31 #include <linux/wait.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/blockgroup_lock.h>
  34 #include <linux/percpu_counter.h>
  35 #include <linux/ratelimit.h>
  36 #include <crypto/hash.h>
  37 #include <linux/falloc.h>
  38 #include <linux/percpu-rwsem.h>
  39 #include <linux/fiemap.h>
  40 #ifdef __KERNEL__
  41 #include <linux/compat.h>
  42 #endif
  43
  44 #include <linux/fscrypt.h>
  45 #include <linux/fsverity.h>
  46
  47 #include <linux/compiler.h>
  48
  49 /*
  50  * The fourth extended filesystem constants/structures
  51  */
  52
  53 /*
  54  * with AGGRESSIVE_CHECK allocator runs consistency checks over
  55  * structures. these checks slow things down a lot
  56  */
  57 #define AGGRESSIVE_CHECK__
  58
  59 /*
  60  * with DOUBLE_CHECK defined mballoc creates persistent in-core
  61  * bitmaps, maintains and uses them to check for double allocations
  62  */
  63 #define DOUBLE_CHECK__
  64
  65 /*
  66  * Define EXT4FS_DEBUG to produce debug messages
  67  */
  68 #undef EXT4FS_DEBUG
  69
  70 /*
  71  * Debug code
  72  */
  73 #ifdef EXT4FS_DEBUG
  74 #define ext4_debug(f, a...)                                             \
  75         do {                                                            \
  76                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",        \
  77                         __FILE__, __LINE__, __func__);                  \
  78                 printk(KERN_DEBUG f, ## a);                             \
  79         } while (0)
  80 #else
  81 #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
  82 #endif
  83
  84  /*
  85   * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
  86   */
  87 #define EXT_DEBUG__
  88
  89 /*
  90  * Dynamic printk for controlled extents debugging.
  91  */
  92 #ifdef CONFIG_EXT4_DEBUG
  93 #define ext_debug(ino, fmt, ...)                                        \
  94         pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt,    \
  95                  current->comm, task_pid_nr(current),                   \
  96                  ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__,       \
  97                  __func__, ##__VA_ARGS__)
  98 #else
  99 #define ext_debug(ino, fmt, ...)        no_printk(fmt, ##__VA_ARGS__)
 100 #endif
 101
 102 #define ASSERT(assert)                                          \
 103 do {                                                                    \
 104         if (unlikely(!(assert))) {                                      \
 105                 printk(KERN_EMERG                                       \
 106                        "Assertion failure in %s() at %s:%d: '%s'\n",    \
 107                        __func__, __FILE__, __LINE__, #assert);          \
 108                 BUG();                                                  \
 109         }                                                               \
 110 } while (0)
 111
 112 /* data type for block offset of block group */
 113 typedef int ext4_grpblk_t;
 114
 115 /* data type for filesystem-wide blocks number */
 116 typedef unsigned long long ext4_fsblk_t;
 117
 118 /* data type for file logical block number */
 119 typedef __u32 ext4_lblk_t;
 120
 121 /* data type for block group number */
 122 typedef unsigned int ext4_group_t;
 123
 124 enum SHIFT_DIRECTION {
 125         SHIFT_LEFT = 0,
 126         SHIFT_RIGHT,
 127 };
 128
 129 /*
 130  * Flags used in mballoc's allocation_context flags field.
 131  *
 132  * Also used to show what's going on for debugging purposes when the
 133  * flag field is exported via the traceport interface
 134  */
 135
 136 /* prefer goal again. length */
 137 #define EXT4_MB_HINT_MERGE              0x0001
 138 /* blocks already reserved */
 139 #define EXT4_MB_HINT_RESERVED           0x0002
 140 /* metadata is being allocated */
 141 #define EXT4_MB_HINT_METADATA           0x0004
 142 /* first blocks in the file */
 143 #define EXT4_MB_HINT_FIRST              0x0008
 144 /* search for the best chunk */
 145 #define EXT4_MB_HINT_BEST               0x0010
 146 /* data is being allocated */
 147 #define EXT4_MB_HINT_DATA               0x0020
 148 /* don't preallocate (for tails) */
 149 #define EXT4_MB_HINT_NOPREALLOC         0x0040
 150 /* allocate for locality group */
 151 #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
 152 /* allocate goal blocks or none */
 153 #define EXT4_MB_HINT_GOAL_ONLY          0x0100
 154 /* goal is meaningful */
 155 #define EXT4_MB_HINT_TRY_GOAL           0x0200
 156 /* blocks already pre-reserved by delayed allocation */
 157 #define EXT4_MB_DELALLOC_RESERVED       0x0400
 158 /* We are doing stream allocation */
 159 #define EXT4_MB_STREAM_ALLOC            0x0800
 160 /* Use reserved root blocks if needed */
 161 #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
 162 /* Use blocks from reserved pool */
 163 #define EXT4_MB_USE_RESERVED            0x2000
 164 /* Do strict check for free blocks while retrying block allocation */
 165 #define EXT4_MB_STRICT_CHECK            0x4000
 166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
 167 #define EXT4_MB_CR0_OPTIMIZED           0x8000
 168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
 169 #define EXT4_MB_CR1_OPTIMIZED           0x00010000
 170 /* Perform linear traversal for one group */
 171 #define EXT4_MB_SEARCH_NEXT_LINEAR      0x00020000
 172 struct ext4_allocation_request {
 173         /* target inode for block we're allocating */
 174         struct inode *inode;
 175         /* how many blocks we want to allocate */
 176         unsigned int len;
 177         /* logical block in target inode */
 178         ext4_lblk_t logical;
 179         /* the closest logical allocated block to the left */
 180         ext4_lblk_t lleft;
 181         /* the closest logical allocated block to the right */
 182         ext4_lblk_t lright;
 183         /* phys. target (a hint) */
 184         ext4_fsblk_t goal;
 185         /* phys. block for the closest logical allocated block to the left */
 186         ext4_fsblk_t pleft;
 187         /* phys. block for the closest logical allocated block to the right */
 188         ext4_fsblk_t pright;
 189         /* flags. see above EXT4_MB_HINT_* */
 190         unsigned int flags;
 191 };
 192
 193 /*
 194  * Logical to physical block mapping, used by ext4_map_blocks()
 195  *
 196  * This structure is used to pass requests into ext4_map_blocks() as
 197  * well as to store the information returned by ext4_map_blocks().  It
 198  * takes less room on the stack than a struct buffer_head.
 199  */
 200 #define EXT4_MAP_NEW            BIT(BH_New)
 201 #define EXT4_MAP_MAPPED         BIT(BH_Mapped)
 202 #define EXT4_MAP_UNWRITTEN      BIT(BH_Unwritten)
 203 #define EXT4_MAP_BOUNDARY       BIT(BH_Boundary)
 204 #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
 205                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
 206
 207 struct ext4_map_blocks {
 208         ext4_fsblk_t m_pblk;
 209         ext4_lblk_t m_lblk;
 210         unsigned int m_len;
 211         unsigned int m_flags;
 212 };
 213
 214 /*
 215  * Block validity checking, system zone rbtree.
 216  */
 217 struct ext4_system_blocks {
 218         struct rb_root root;
 219         struct rcu_head rcu;
 220 };
 221
 222 /*
 223  * Flags for ext4_io_end->flags
 224  */
 225 #define EXT4_IO_END_UNWRITTEN   0x0001
 226
 227 struct ext4_io_end_vec {
 228         struct list_head list;          /* list of io_end_vec */
 229         loff_t offset;                  /* offset in the file */
 230         ssize_t size;                   /* size of the extent */
 231 };
 232
 233 /*
 234  * For converting unwritten extents on a work queue. 'handle' is used for
 235  * buffered writeback.
 236  */
 237 typedef struct ext4_io_end {
 238         struct list_head        list;           /* per-file finished IO list */
 239         handle_t                *handle;        /* handle reserved for extent
 240                                                  * conversion */
 241         struct inode            *inode;         /* file being written to */
 242         struct bio              *bio;           /* Linked list of completed
 243                                                  * bios covering the extent */
 244         unsigned int            flag;           /* unwritten or not */
 245         refcount_t              count;          /* reference counter */
 246         struct list_head        list_vec;       /* list of ext4_io_end_vec */
 247 } ext4_io_end_t;
 248
 249 struct ext4_io_submit {
 250         struct writeback_control *io_wbc;
 251         struct bio              *io_bio;
 252         ext4_io_end_t           *io_end;
 253         sector_t                io_next_block;
 254 };
 255
 256 /*
 257  * Special inodes numbers
 258  */
 259 #define EXT4_BAD_INO             1      /* Bad blocks inode */
 260 #define EXT4_ROOT_INO            2      /* Root inode */
 261 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
 262 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
 263 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
 264 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
 265 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
 266 #define EXT4_JOURNAL_INO         8      /* Journal inode */
 267
 268 /* First non-reserved inode for old ext4 filesystems */
 269 #define EXT4_GOOD_OLD_FIRST_INO 11
 270
 271 /*
 272  * Maximal count of links to a file
 273  */
 274 #define EXT4_LINK_MAX           65000
 275
 276 /*
 277  * Macro-instructions used to manage several block sizes
 278  */
 279 #define EXT4_MIN_BLOCK_SIZE             1024
 280 #define EXT4_MAX_BLOCK_SIZE             65536
 281 #define EXT4_MIN_BLOCK_LOG_SIZE         10
 282 #define EXT4_MAX_BLOCK_LOG_SIZE         16
 283 #define EXT4_MAX_CLUSTER_LOG_SIZE       30
 284 #ifdef __KERNEL__
 285 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
 286 #else
 287 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 288 #endif
 289 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
 290 #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
 291                                          EXT4_SB(s)->s_cluster_bits)
 292 #ifdef __KERNEL__
 293 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 294 # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
 295 #else
 296 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 297 #endif
 298 #ifdef __KERNEL__
 299 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
 300 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
 301 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
 302 #else
 303 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 304                                  EXT4_GOOD_OLD_INODE_SIZE : \
 305                                  (s)->s_inode_size)
 306 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
 307                                  EXT4_GOOD_OLD_FIRST_INO : \
 308                                  (s)->s_first_ino)
 309 #endif
 310 #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
 311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
 312         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
 313                                                                   blkbits))
 314
 315 /* Translate a block number to a cluster number */
 316 #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
 317 /* Translate a cluster number to a block number */
 318 #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
 319 /* Translate # of blks to # of clusters */
 320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
 321                                  (sbi)->s_cluster_bits)
 322 /* Mask out the low bits to get the starting block of the cluster */
 323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                              \
 324                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                              \
 326                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 327 /* Fill in the low bits to get the last block of the cluster */
 328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
 329                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
 330 /* Get the cluster offset */
 331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                               \
 332                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
 333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                               \
 334                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
 335
 336 /*
 337  * Structure of a blocks group descriptor
 338  */
 339 struct ext4_group_desc
 340 {
 341         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
 342         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
 343         __le32  bg_inode_table_lo;      /* Inodes table block */
 344         __le16  bg_free_blocks_count_lo;/* Free blocks count */
 345         __le16  bg_free_inodes_count_lo;/* Free inodes count */
 346         __le16  bg_used_dirs_count_lo;  /* Directories count */
 347         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 348         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 349         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
 350         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
 351         __le16  bg_itable_unused_lo;    /* Unused inodes count */
 352         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
 353         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 354         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 355         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
 356         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
 357         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
 358         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
 359         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
 360         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 361         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
 362         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
 363         __u32   bg_reserved;
 364 };
 365
 366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
 367         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
 368          sizeof(__le16))
 369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
 370         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
 371          sizeof(__le16))
 372
 373 /*
 374  * Structure of a flex block group info
 375  */
 376
 377 struct flex_groups {
 378         atomic64_t      free_clusters;
 379         atomic_t        free_inodes;
 380         atomic_t        used_dirs;
 381 };
 382
 383 #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
 384 #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
 385 #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 386
 387 /*
 388  * Macro-instructions used to manage group descriptors
 389  */
 390 #define EXT4_MIN_DESC_SIZE              32
 391 #define EXT4_MIN_DESC_SIZE_64BIT        64
 392 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
 393 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
 394 #ifdef __KERNEL__
 395 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
 396 # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
 397 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
 398 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
 399 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
 400 #else
 401 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 402 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 403 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 404 #endif
 405
 406 /*
 407  * Constants relative to the data blocks
 408  */
 409 #define EXT4_NDIR_BLOCKS                12
 410 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
 411 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
 412 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
 413 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
 414
 415 /*
 416  * Inode flags
 417  */
 418 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
 419 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
 420 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
 421 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
 422 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
 423 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
 424 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
 425 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
 426 /* Reserved for compression usage... */
 427 #define EXT4_DIRTY_FL                   0x00000100
 428 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 429 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
 430         /* nb: was previously EXT2_ECOMPR_FL */
 431 #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
 432 /* End compression flags --- maybe not all used */
 433 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
 434 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
 435 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 436 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 437 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 438 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 439 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 440 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 441 #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
 442 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
 444
 445 #define EXT4_DAX_FL                     0x02000000 /* Inode is DAX */
 446
 447 #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
 448 #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
 449 #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded directory */
 450 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 451
 452 /* User modifiable flags */
 453 #define EXT4_FL_USER_MODIFIABLE         (EXT4_SECRM_FL | \
 454                                          EXT4_UNRM_FL | \
 455                                          EXT4_COMPR_FL | \
 456                                          EXT4_SYNC_FL | \
 457                                          EXT4_IMMUTABLE_FL | \
 458                                          EXT4_APPEND_FL | \
 459                                          EXT4_NODUMP_FL | \
 460                                          EXT4_NOATIME_FL | \
 461                                          EXT4_JOURNAL_DATA_FL | \
 462                                          EXT4_NOTAIL_FL | \
 463                                          EXT4_DIRSYNC_FL | \
 464                                          EXT4_TOPDIR_FL | \
 465                                          EXT4_EXTENTS_FL | \
 466                                          0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
 467                                          EXT4_DAX_FL | \
 468                                          EXT4_PROJINHERIT_FL | \
 469                                          EXT4_CASEFOLD_FL)
 470
 471 /* User visible flags */
 472 #define EXT4_FL_USER_VISIBLE            (EXT4_FL_USER_MODIFIABLE | \
 473                                          EXT4_DIRTY_FL | \
 474                                          EXT4_COMPRBLK_FL | \
 475                                          EXT4_NOCOMPR_FL | \
 476                                          EXT4_ENCRYPT_FL | \
 477                                          EXT4_INDEX_FL | \
 478                                          EXT4_VERITY_FL | \
 479                                          EXT4_INLINE_DATA_FL)
 480
 481 /* Flags that should be inherited by new inodes from their parent. */
 482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
 483                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
 484                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
 485                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
 486                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
 487                            EXT4_DAX_FL)
 488
 489 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
 491                            EXT4_PROJINHERIT_FL))
 492
 493 /* Flags that are appropriate for non-directories/regular files. */
 494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 495
 496 /* The only flags that should be swapped */
 497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
 498
 499 /* Flags which are mutually exclusive to DAX */
 500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
 501                            EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
 502
 503 /* Mask out flags that are inappropriate for the given type of inode. */
 504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 505 {
 506         if (S_ISDIR(mode))
 507                 return flags;
 508         else if (S_ISREG(mode))
 509                 return flags & EXT4_REG_FLMASK;
 510         else
 511                 return flags & EXT4_OTHER_FLMASK;
 512 }
 513
 514 /*
 515  * Inode flags used for atomic set/get
 516  */
 517 enum {
 518         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
 519         EXT4_INODE_UNRM         = 1,    /* Undelete */
 520         EXT4_INODE_COMPR        = 2,    /* Compress file */
 521         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
 522         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
 523         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
 524         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
 525         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
 526 /* Reserved for compression usage... */
 527         EXT4_INODE_DIRTY        = 8,
 528         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
 529         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
 530         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
 531 /* End compression flags --- maybe not all used */
 532         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
 533         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
 534         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
 535         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
 536         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
 537         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
 538         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
 539         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
 540         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
 541         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
 542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
 543         EXT4_INODE_DAX          = 25,   /* Inode is DAX */
 544         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
 545         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
 546         EXT4_INODE_CASEFOLD     = 30,   /* Casefolded directory */
 547         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
 548 };
 549
 550 /*
 551  * Since it's pretty easy to mix up bit numbers and hex values, we use a
 552  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
 553  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
 554  * any extra space in the compiled kernel image, otherwise, the build will fail.
 555  * It's important that these values are the same, since we are using
 556  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
 557  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
 558  * values found in ext2, ext3 and ext4 filesystems, and of course the values
 559  * defined in e2fsprogs.
 560  *
 561  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
 562  */
 563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
 564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
 565
 566 static inline void ext4_check_flag_values(void)
 567 {
 568         CHECK_FLAG_VALUE(SECRM);
 569         CHECK_FLAG_VALUE(UNRM);
 570         CHECK_FLAG_VALUE(COMPR);
 571         CHECK_FLAG_VALUE(SYNC);
 572         CHECK_FLAG_VALUE(IMMUTABLE);
 573         CHECK_FLAG_VALUE(APPEND);
 574         CHECK_FLAG_VALUE(NODUMP);
 575         CHECK_FLAG_VALUE(NOATIME);
 576         CHECK_FLAG_VALUE(DIRTY);
 577         CHECK_FLAG_VALUE(COMPRBLK);
 578         CHECK_FLAG_VALUE(NOCOMPR);
 579         CHECK_FLAG_VALUE(ENCRYPT);
 580         CHECK_FLAG_VALUE(INDEX);
 581         CHECK_FLAG_VALUE(IMAGIC);
 582         CHECK_FLAG_VALUE(JOURNAL_DATA);
 583         CHECK_FLAG_VALUE(NOTAIL);
 584         CHECK_FLAG_VALUE(DIRSYNC);
 585         CHECK_FLAG_VALUE(TOPDIR);
 586         CHECK_FLAG_VALUE(HUGE_FILE);
 587         CHECK_FLAG_VALUE(EXTENTS);
 588         CHECK_FLAG_VALUE(VERITY);
 589         CHECK_FLAG_VALUE(EA_INODE);
 590         CHECK_FLAG_VALUE(INLINE_DATA);
 591         CHECK_FLAG_VALUE(PROJINHERIT);
 592         CHECK_FLAG_VALUE(CASEFOLD);
 593         CHECK_FLAG_VALUE(RESERVED);
 594 }
 595
 596 /* Used to pass group descriptor data when online resize is done */
 597 struct ext4_new_group_input {
 598         __u32 group;            /* Group number for this data */
 599         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 600         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 601         __u64 inode_table;      /* Absolute block number of inode table start */
 602         __u32 blocks_count;     /* Total number of blocks in this group */
 603         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 604         __u16 unused;
 605 };
 606
 607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 608 struct compat_ext4_new_group_input {
 609         u32 group;
 610         compat_u64 block_bitmap;
 611         compat_u64 inode_bitmap;
 612         compat_u64 inode_table;
 613         u32 blocks_count;
 614         u16 reserved_blocks;
 615         u16 unused;
 616 };
 617 #endif
 618
 619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
 620 struct ext4_new_group_data {
 621         __u32 group;
 622         __u64 block_bitmap;
 623         __u64 inode_bitmap;
 624         __u64 inode_table;
 625         __u32 blocks_count;
 626         __u16 reserved_blocks;
 627         __u16 mdata_blocks;
 628         __u32 free_clusters_count;
 629 };
 630
 631 /* Indexes used to index group tables in ext4_new_group_data */
 632 enum {
 633         BLOCK_BITMAP = 0,       /* block bitmap */
 634         INODE_BITMAP,           /* inode bitmap */
 635         INODE_TABLE,            /* inode tables */
 636         GROUP_TABLE_COUNT,
 637 };
 638
 639 /*
 640  * Flags used by ext4_map_blocks()
 641  */
 642         /* Allocate any needed blocks and/or convert an unwritten
 643            extent to be an initialized ext4 */
 644 #define EXT4_GET_BLOCKS_CREATE                  0x0001
 645         /* Request the creation of an unwritten extent */
 646 #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
 647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
 648                                                  EXT4_GET_BLOCKS_CREATE)
 649         /* Caller is from the delayed allocation writeout path
 650          * finally doing the actual allocation of delayed blocks */
 651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
 652         /* caller is from the direct IO path, request to creation of an
 653         unwritten extents if not allocated, split the unwritten
 654         extent if blocks has been preallocated already*/
 655 #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
 656 #define EXT4_GET_BLOCKS_CONVERT                 0x0010
 657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
 658                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 659         /* Convert extent to initialized after IO complete */
 660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
 661                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
 662         /* Eventual metadata allocation (due to growing extent tree)
 663          * should not fail, so try to use reserved blocks for that.*/
 664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
 665         /* Don't normalize allocation size (used for fallocate) */
 666 #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
 667         /* Convert written extents to unwritten */
 668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
 669         /* Write zeros to newly created written extents */
 670 #define EXT4_GET_BLOCKS_ZERO                    0x0200
 671 #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
 672                                         EXT4_GET_BLOCKS_ZERO)
 673         /* Caller will submit data before dropping transaction handle. This
 674          * allows jbd2 to avoid submitting data before commit. */
 675 #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
 676
 677 /*
 678  * The bit position of these flags must not overlap with any of the
 679  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
 680  * read_extent_tree_block(), ext4_split_extent_at(),
 681  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
 682  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
 683  * caching the extents when reading from the extent tree while a
 684  * truncate or punch hole operation is in progress.
 685  */
 686 #define EXT4_EX_NOCACHE                         0x40000000
 687 #define EXT4_EX_FORCE_CACHE                     0x20000000
 688 #define EXT4_EX_NOFAIL                          0x10000000
 689
 690 /*
 691  * Flags used by ext4_free_blocks
 692  */
 693 #define EXT4_FREE_BLOCKS_METADATA               0x0001
 694 #define EXT4_FREE_BLOCKS_FORGET                 0x0002
 695 #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
 696 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
 697 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
 698 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
 699 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
 700
 701 /*
 702  * ioctl commands
 703  */
 704 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
 705 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
 706 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
 707 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
 708 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
 709 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
 710 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 711 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
 712 #define EXT4_IOC_MIGRATE                _IO('f', 9)
 713  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 714  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 715 #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
 716 #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
 717 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 718 #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
 719 #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
 720 /* ioctl codes 19--39 are reserved for fscrypt */
 721 #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
 722 #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
 723 #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
 724 #define EXT4_IOC_CHECKPOINT             _IOW('f', 43, __u32)
 725
 726 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 727
 728 /*
 729  * Flags for going down operation
 730  */
 731 #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
 732 #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
 733 #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
 734
 735 /*
 736  * Flags returned by EXT4_IOC_GETSTATE
 737  *
 738  * We only expose to userspace a subset of the state flags in
 739  * i_state_flags
 740  */
 741 #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
 742 #define EXT4_STATE_FLAG_NEW             0x00000002
 743 #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
 744 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
 745
 746 /* flags for ioctl EXT4_IOC_CHECKPOINT */
 747 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD        0x1
 748 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT        0x2
 749 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN        0x4
 750 #define EXT4_IOC_CHECKPOINT_FLAG_VALID          (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
 751                                                 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
 752                                                 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
 753
 754 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 755 /*
 756  * ioctl commands in 32 bit emulation
 757  */
 758 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
 759 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
 760 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
 761 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
 762 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
 763 #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
 764 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
 765 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
 766 #endif
 767
 768 /*
 769  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 770  * It indicates that the entry in extent status cache is for a hole.
 771  */
 772 #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
 773
 774 /* Max physical block we can address w/o extents */
 775 #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
 776
 777 /* Max logical block we can support */
 778 #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFE
 779
 780 /*
 781  * Structure of an inode on the disk
 782  */
 783 struct ext4_inode {
 784         __le16  i_mode;         /* File mode */
 785         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 786         __le32  i_size_lo;      /* Size in bytes */
 787         __le32  i_atime;        /* Access time */
 788         __le32  i_ctime;        /* Inode Change time */
 789         __le32  i_mtime;        /* Modification time */
 790         __le32  i_dtime;        /* Deletion Time */
 791         __le16  i_gid;          /* Low 16 bits of Group Id */
 792         __le16  i_links_count;  /* Links count */
 793         __le32  i_blocks_lo;    /* Blocks count */
 794         __le32  i_flags;        /* File flags */
 795         union {
 796                 struct {
 797                         __le32  l_i_version;
 798                 } linux1;
 799                 struct {
 800                         __u32  h_i_translator;
 801                 } hurd1;
 802                 struct {
 803                         __u32  m_i_reserved1;
 804                 } masix1;
 805         } osd1;                         /* OS dependent 1 */
 806         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
 807         __le32  i_generation;   /* File version (for NFS) */
 808         __le32  i_file_acl_lo;  /* File ACL */
 809         __le32  i_size_high;
 810         __le32  i_obso_faddr;   /* Obsoleted fragment address */
 811         union {
 812                 struct {
 813                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
 814                         __le16  l_i_file_acl_high;
 815                         __le16  l_i_uid_high;   /* these 2 fields */
 816                         __le16  l_i_gid_high;   /* were reserved2[0] */
 817                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
 818                         __le16  l_i_reserved;
 819                 } linux2;
 820                 struct {
 821                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 822                         __u16   h_i_mode_high;
 823                         __u16   h_i_uid_high;
 824                         __u16   h_i_gid_high;
 825                         __u32   h_i_author;
 826                 } hurd2;
 827                 struct {
 828                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
 829                         __le16  m_i_file_acl_high;
 830                         __u32   m_i_reserved2[2];
 831                 } masix2;
 832         } osd2;                         /* OS dependent 2 */
 833         __le16  i_extra_isize;
 834         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
 835         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
 836         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
 837         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
 838         __le32  i_crtime;       /* File Creation time */
 839         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
 840         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
 841         __le32  i_projid;       /* Project ID */
 842 };
 843
 844 struct move_extent {
 845         __u32 reserved;         /* should be zero */
 846         __u32 donor_fd;         /* donor file descriptor */
 847         __u64 orig_start;       /* logical start offset in block for orig */
 848         __u64 donor_start;      /* logical start offset in block for donor */
 849         __u64 len;              /* block length to be moved */
 850         __u64 moved_len;        /* moved block length */
 851 };
 852
 853 #define EXT4_EPOCH_BITS 2
 854 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 855 #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
 856
 857 /*
 858  * Extended fields will fit into an inode if the filesystem was formatted
 859  * with large inodes (-I 256 or larger) and there are not currently any EAs
 860  * consuming all of the available space. For new inodes we always reserve
 861  * enough space for the kernel's known extended fields, but for inodes
 862  * created with an old kernel this might not have been the case. None of
 863  * the extended inode fields is critical for correct filesystem operation.
 864  * This macro checks if a certain field fits in the inode. Note that
 865  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
 866  */
 867 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
 868         ((offsetof(typeof(*ext4_inode), field) +        \
 869           sizeof((ext4_inode)->field))                  \
 870         <= (EXT4_GOOD_OLD_INODE_SIZE +                  \
 871             (einode)->i_extra_isize))                   \
 872
 873 /*
 874  * We use an encoding that preserves the times for extra epoch "00":
 875  *
 876  * extra  msb of                         adjust for signed
 877  * epoch  32-bit                         32-bit tv_sec to
 878  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
 879  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
 880  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
 881  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
 882  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
 883  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
 884  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
 885  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
 886  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
 887  *
 888  * Note that previous versions of the kernel on 64-bit systems would
 889  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
 890  * 1970.  e2fsck will correct this, assuming that it is run on the
 891  * affected filesystem before 2242.
 892  */
 893
 894 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
 895 {
 896         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
 897         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
 898 }
 899
 900 static inline void ext4_decode_extra_time(struct timespec64 *time,
 901                                           __le32 extra)
 902 {
 903         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
 904                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
 905         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
 906 }
 907
 908 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
 909 do {                                                                            \
 910         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
 911                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);        \
 912                 (raw_inode)->xtime ## _extra =                                  \
 913                                 ext4_encode_extra_time(&(inode)->xtime);        \
 914                 }                                                               \
 915         else    \
 916                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));    \
 917 } while (0)
 918
 919 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
 920 do {                                                                           \
 921         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 922                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
 923         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 924                 (raw_inode)->xtime ## _extra =                                 \
 925                                 ext4_encode_extra_time(&(einode)->xtime);      \
 926 } while (0)
 927
 928 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
 929 do {                                                                            \
 930         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);        \
 931         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
 932                 ext4_decode_extra_time(&(inode)->xtime,                         \
 933                                        raw_inode->xtime ## _extra);             \
 934                 }                                                               \
 935         else                                                                    \
 936                 (inode)->xtime.tv_nsec = 0;                                     \
 937 } while (0)
 938
 939
 940 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
 941 do {                                                                           \
 942         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
 943                 (einode)->xtime.tv_sec =                                       \
 944                         (signed)le32_to_cpu((raw_inode)->xtime);               \
 945         else                                                                   \
 946                 (einode)->xtime.tv_sec = 0;                                    \
 947         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
 948                 ext4_decode_extra_time(&(einode)->xtime,                       \
 949                                        raw_inode->xtime ## _extra);            \
 950         else                                                                   \
 951                 (einode)->xtime.tv_nsec = 0;                                   \
 952 } while (0)
 953
 954 #define i_disk_version osd1.linux1.l_i_version
 955
 956 #if defined(__KERNEL__) || defined(__linux__)
 957 #define i_reserved1     osd1.linux1.l_i_reserved1
 958 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 959 #define i_blocks_high   osd2.linux2.l_i_blocks_high
 960 #define i_uid_low       i_uid
 961 #define i_gid_low       i_gid
 962 #define i_uid_high      osd2.linux2.l_i_uid_high
 963 #define i_gid_high      osd2.linux2.l_i_gid_high
 964 #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
 965
 966 #elif defined(__GNU__)
 967
 968 #define i_translator    osd1.hurd1.h_i_translator
 969 #define i_uid_high      osd2.hurd2.h_i_uid_high
 970 #define i_gid_high      osd2.hurd2.h_i_gid_high
 971 #define i_author        osd2.hurd2.h_i_author
 972
 973 #elif defined(__masix__)
 974
 975 #define i_reserved1     osd1.masix1.m_i_reserved1
 976 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
 977 #define i_reserved2     osd2.masix2.m_i_reserved2
 978
 979 #endif /* defined(__KERNEL__) || defined(__linux__) */
 980
 981 #include "extents_status.h"
 982 #include "fast_commit.h"
 983
 984 /*
 985  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
 986  *
 987  * These are needed to avoid lockdep false positives when we need to
 988  * allocate blocks to the quota inode during ext4_map_blocks(), while
 989  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
 990  * do quota tracking for the quota inode, this avoids deadlock (as
 991  * well as infinite recursion, since it isn't turtles all the way
 992  * down...)
 993  *
 994  *  I_DATA_SEM_NORMAL - Used for most inodes
 995  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
 996  *                        where the second inode has larger inode number
 997  *                        than the first
 998  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
 999  */
1000 enum {
1001         I_DATA_SEM_NORMAL = 0,
1002         I_DATA_SEM_OTHER,
1003         I_DATA_SEM_QUOTA,
1004 };
1005
1006
1007 /*
1008  * fourth extended file system inode data in memory
1009  */
1010 struct ext4_inode_info {
1011         __le32  i_data[15];     /* unconverted */
1012         __u32   i_dtime;
1013         ext4_fsblk_t    i_file_acl;
1014
1015         /*
1016          * i_block_group is the number of the block group which contains
1017          * this file's inode.  Constant across the lifetime of the inode,
1018          * it is used for making block allocation decisions - we try to
1019          * place a file's data blocks near its inode block, and new inodes
1020          * near to their parent directory's inode.
1021          */
1022         ext4_group_t    i_block_group;
1023         ext4_lblk_t     i_dir_start_lookup;
1024 #if (BITS_PER_LONG < 64)
1025         unsigned long   i_state_flags;          /* Dynamic state flags */
1026 #endif
1027         unsigned long   i_flags;
1028
1029         /*
1030          * Extended attributes can be read independently of the main file
1031          * data. Taking i_mutex even when reading would cause contention
1032          * between readers of EAs and writers of regular file data, so
1033          * instead we synchronize on xattr_sem when reading or changing
1034          * EAs.
1035          */
1036         struct rw_semaphore xattr_sem;
1037
1038         /*
1039          * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1040          * i_orphan is used.
1041          */
1042         union {
1043                 struct list_head i_orphan;      /* unlinked but open inodes */
1044                 unsigned int i_orphan_idx;      /* Index in orphan file */
1045         };
1046
1047         /* Fast commit related info */
1048
1049         struct list_head i_fc_list;     /*
1050                                          * inodes that need fast commit
1051                                          * protected by sbi->s_fc_lock.
1052                                          */
1053
1054         /* Start of lblk range that needs to be committed in this fast commit */
1055         ext4_lblk_t i_fc_lblk_start;
1056
1057         /* End of lblk range that needs to be committed in this fast commit */
1058         ext4_lblk_t i_fc_lblk_len;
1059
1060         /* Number of ongoing updates on this inode */
1061         atomic_t  i_fc_updates;
1062
1063         /* Fast commit wait queue for this inode */
1064         wait_queue_head_t i_fc_wait;
1065
1066         /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1067         struct mutex i_fc_lock;
1068
1069         /*
1070          * i_disksize keeps track of what the inode size is ON DISK, not
1071          * in memory.  During truncate, i_size is set to the new size by
1072          * the VFS prior to calling ext4_truncate(), but the filesystem won't
1073          * set i_disksize to 0 until the truncate is actually under way.
1074          *
1075          * The intent is that i_disksize always represents the blocks which
1076          * are used by this file.  This allows recovery to restart truncate
1077          * on orphans if we crash during truncate.  We actually write i_disksize
1078          * into the on-disk inode when writing inodes out, instead of i_size.
1079          *
1080          * The only time when i_disksize and i_size may be different is when
1081          * a truncate is in progress.  The only things which change i_disksize
1082          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1083          */
1084         loff_t  i_disksize;
1085
1086         /*
1087          * i_data_sem is for serialising ext4_truncate() against
1088          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
1089          * data tree are chopped off during truncate. We can't do that in
1090          * ext4 because whenever we perform intermediate commits during
1091          * truncate, the inode and all the metadata blocks *must* be in a
1092          * consistent state which allows truncation of the orphans to restart
1093          * during recovery.  Hence we must fix the get_block-vs-truncate race
1094          * by other means, so we have i_data_sem.
1095          */
1096         struct rw_semaphore i_data_sem;
1097         struct inode vfs_inode;
1098         struct jbd2_inode *jinode;
1099
1100         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
1101
1102         /*
1103          * File creation time. Its function is same as that of
1104          * struct timespec64 i_{a,c,m}time in the generic inode.
1105          */
1106         struct timespec64 i_crtime;
1107
1108         /* mballoc */
1109         atomic_t i_prealloc_active;
1110         struct list_head i_prealloc_list;
1111         spinlock_t i_prealloc_lock;
1112
1113         /* extents status tree */
1114         struct ext4_es_tree i_es_tree;
1115         rwlock_t i_es_lock;
1116         struct list_head i_es_list;
1117         unsigned int i_es_all_nr;       /* protected by i_es_lock */
1118         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
1119         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
1120                                            extents to shrink. Protected by
1121                                            i_es_lock  */
1122
1123         /* ialloc */
1124         ext4_group_t    i_last_alloc_group;
1125
1126         /* allocation reservation info for delalloc */
1127         /* In case of bigalloc, this refer to clusters rather than blocks */
1128         unsigned int i_reserved_data_blocks;
1129
1130         /* pending cluster reservations for bigalloc file systems */
1131         struct ext4_pending_tree i_pending_tree;
1132
1133         /* on-disk additional length */
1134         __u16 i_extra_isize;
1135
1136         /* Indicate the inline data space. */
1137         u16 i_inline_off;
1138         u16 i_inline_size;
1139
1140 #ifdef CONFIG_QUOTA
1141         /* quota space reservation, managed internally by quota code */
1142         qsize_t i_reserved_quota;
1143 #endif
1144
1145         /* Lock protecting lists below */
1146         spinlock_t i_completed_io_lock;
1147         /*
1148          * Completed IOs that need unwritten extents handling and have
1149          * transaction reserved
1150          */
1151         struct list_head i_rsv_conversion_list;
1152         struct work_struct i_rsv_conversion_work;
1153         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1154
1155         spinlock_t i_block_reservation_lock;
1156
1157         /*
1158          * Transactions that contain inode's metadata needed to complete
1159          * fsync and fdatasync, respectively.
1160          */
1161         tid_t i_sync_tid;
1162         tid_t i_datasync_tid;
1163
1164 #ifdef CONFIG_QUOTA
1165         struct dquot *i_dquot[MAXQUOTAS];
1166 #endif
1167
1168         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1169         __u32 i_csum_seed;
1170
1171         kprojid_t i_projid;
1172 };
1173
1174 /*
1175  * File system states
1176  */
1177 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
1178 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
1179 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
1180 #define EXT4_FC_REPLAY                  0x0020  /* Fast commit replay ongoing */
1181
1182 /*
1183  * Misc. filesystem flags
1184  */
1185 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
1186 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
1187 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
1188
1189 /*
1190  * Mount flags set via mount options or defaults
1191  */
1192 #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
1193 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
1194 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
1195 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
1196 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
1197 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
1198 #define EXT4_MOUNT_ERRORS_MASK          0x00070
1199 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
1200 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
1201 #ifdef CONFIG_FS_DAX
1202 #define EXT4_MOUNT_DAX_ALWAYS           0x00200 /* Direct Access */
1203 #else
1204 #define EXT4_MOUNT_DAX_ALWAYS           0
1205 #endif
1206 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
1207 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
1208 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
1209 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
1210 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
1211 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
1212 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
1213 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
1214 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
1215 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
1216 #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
1217 #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
1218                                                  * enable enforcement for hidden
1219                                                  * quota files */
1220 #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
1221                                                   * enforcement for hidden quota
1222                                                   * files */
1223 #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
1224                                                   * enforcement */
1225 #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
1226 #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
1227 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1228 #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
1229 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1230 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
1231 #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
1232 #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
1233 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
1234 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
1235
1236 /*
1237  * Mount flags set either automatically (could not be set by mount option)
1238  * based on per file system feature or property or in special cases such as
1239  * distinguishing between explicit mount option definition and default.
1240  */
1241 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
1242                                                       specified delalloc */
1243 #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
1244                                                       size of blocksize * 8
1245                                                       blocks */
1246 #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
1247                                                       file systems */
1248 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
1249                                                 specified journal checksum */
1250
1251 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1252 #define EXT4_MOUNT2_DAX_NEVER           0x00000020 /* Do not allow Direct Access */
1253 #define EXT4_MOUNT2_DAX_INODE           0x00000040 /* For printing options only */
1254 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN    0x00000080 /* Optimize group
1255                                                     * scanning in mballoc
1256                                                     */
1257
1258 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
1259                                                 ~EXT4_MOUNT_##opt
1260 #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
1261                                                 EXT4_MOUNT_##opt
1262 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
1263                                          EXT4_MOUNT_##opt)
1264
1265 #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
1266                                                 ~EXT4_MOUNT2_##opt
1267 #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
1268                                                 EXT4_MOUNT2_##opt
1269 #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
1270                                          EXT4_MOUNT2_##opt)
1271
1272 #define ext4_test_and_set_bit           __test_and_set_bit_le
1273 #define ext4_set_bit                    __set_bit_le
1274 #define ext4_set_bit_atomic             ext2_set_bit_atomic
1275 #define ext4_test_and_clear_bit         __test_and_clear_bit_le
1276 #define ext4_clear_bit                  __clear_bit_le
1277 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
1278 #define ext4_test_bit                   test_bit_le
1279 #define ext4_find_next_zero_bit         find_next_zero_bit_le
1280 #define ext4_find_next_bit              find_next_bit_le
1281
1282 extern void ext4_set_bits(void *bm, int cur, int len);
1283
1284 /*
1285  * Maximal mount counts between two filesystem checks
1286  */
1287 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
1288 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
1289
1290 /*
1291  * Behaviour when detecting errors
1292  */
1293 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
1294 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
1295 #define EXT4_ERRORS_PANIC               3       /* Panic */
1296 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
1297
1298 /* Metadata checksum algorithm codes */
1299 #define EXT4_CRC32C_CHKSUM              1
1300
1301 #define EXT4_LABEL_MAX                  16
1302
1303 /*
1304  * Structure of the super block
1305  */
1306 struct ext4_super_block {
1307 /*00*/  __le32  s_inodes_count;         /* Inodes count */
1308         __le32  s_blocks_count_lo;      /* Blocks count */
1309         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
1310         __le32  s_free_blocks_count_lo; /* Free blocks count */
1311 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
1312         __le32  s_first_data_block;     /* First Data Block */
1313         __le32  s_log_block_size;       /* Block size */
1314         __le32  s_log_cluster_size;     /* Allocation cluster size */
1315 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
1316         __le32  s_clusters_per_group;   /* # Clusters per group */
1317         __le32  s_inodes_per_group;     /* # Inodes per group */
1318         __le32  s_mtime;                /* Mount time */
1319 /*30*/  __le32  s_wtime;                /* Write time */
1320         __le16  s_mnt_count;            /* Mount count */
1321         __le16  s_max_mnt_count;        /* Maximal mount count */
1322         __le16  s_magic;                /* Magic signature */
1323         __le16  s_state;                /* File system state */
1324         __le16  s_errors;               /* Behaviour when detecting errors */
1325         __le16  s_minor_rev_level;      /* minor revision level */
1326 /*40*/  __le32  s_lastcheck;            /* time of last check */
1327         __le32  s_checkinterval;        /* max. time between checks */
1328         __le32  s_creator_os;           /* OS */
1329         __le32  s_rev_level;            /* Revision level */
1330 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
1331         __le16  s_def_resgid;           /* Default gid for reserved blocks */
1332         /*
1333          * These fields are for EXT4_DYNAMIC_REV superblocks only.
1334          *
1335          * Note: the difference between the compatible feature set and
1336          * the incompatible feature set is that if there is a bit set
1337          * in the incompatible feature set that the kernel doesn't
1338          * know about, it should refuse to mount the filesystem.
1339          *
1340          * e2fsck's requirements are more strict; if it doesn't know
1341          * about a feature in either the compatible or incompatible
1342          * feature set, it must abort and not try to meddle with
1343          * things it doesn't understand...
1344          */
1345         __le32  s_first_ino;            /* First non-reserved inode */
1346         __le16  s_inode_size;           /* size of inode structure */
1347         __le16  s_block_group_nr;       /* block group # of this superblock */
1348         __le32  s_feature_compat;       /* compatible feature set */
1349 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
1350         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
1351 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
1352 /*78*/  char    s_volume_name[EXT4_LABEL_MAX];  /* volume name */
1353 /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
1354 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
1355         /*
1356          * Performance hints.  Directory preallocation should only
1357          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1358          */
1359         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
1360         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
1361         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
1362         /*
1363          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1364          */
1365 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
1366 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
1367         __le32  s_journal_dev;          /* device number of journal file */
1368         __le32  s_last_orphan;          /* start of list of inodes to delete */
1369         __le32  s_hash_seed[4];         /* HTREE hash seed */
1370         __u8    s_def_hash_version;     /* Default hash version to use */
1371         __u8    s_jnl_backup_type;
1372         __le16  s_desc_size;            /* size of group descriptor */
1373 /*100*/ __le32  s_default_mount_opts;
1374         __le32  s_first_meta_bg;        /* First metablock block group */
1375         __le32  s_mkfs_time;            /* When the filesystem was created */
1376         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
1377         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1378 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
1379         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
1380         __le32  s_free_blocks_count_hi; /* Free blocks count */
1381         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
1382         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
1383         __le32  s_flags;                /* Miscellaneous flags */
1384         __le16  s_raid_stride;          /* RAID stride */
1385         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
1386         __le64  s_mmp_block;            /* Block for multi-mount protection */
1387         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
1388         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
1389         __u8    s_checksum_type;        /* metadata checksum algorithm used */
1390         __u8    s_encryption_level;     /* versioning level for encryption */
1391         __u8    s_reserved_pad;         /* Padding to next 32bits */
1392         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
1393         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
1394         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
1395         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
1396                                               snapshot's future use */
1397         __le32  s_snapshot_list;        /* inode number of the head of the
1398                                            on-disk snapshot list */
1399 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1400         __le32  s_error_count;          /* number of fs errors */
1401         __le32  s_first_error_time;     /* first time an error happened */
1402         __le32  s_first_error_ino;      /* inode involved in first error */
1403         __le64  s_first_error_block;    /* block involved of first error */
1404         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
1405         __le32  s_first_error_line;     /* line number where error happened */
1406         __le32  s_last_error_time;      /* most recent time of an error */
1407         __le32  s_last_error_ino;       /* inode involved in last error */
1408         __le32  s_last_error_line;      /* line number where error happened */
1409         __le64  s_last_error_block;     /* block involved of last error */
1410         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
1411 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1412         __u8    s_mount_opts[64];
1413         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
1414         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
1415         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
1416         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
1417         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
1418         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
1419         __le32  s_lpf_ino;              /* Location of the lost+found inode */
1420         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
1421         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
1422         __u8    s_wtime_hi;
1423         __u8    s_mtime_hi;
1424         __u8    s_mkfs_time_hi;
1425         __u8    s_lastcheck_hi;
1426         __u8    s_first_error_time_hi;
1427         __u8    s_last_error_time_hi;
1428         __u8    s_first_error_errcode;
1429         __u8    s_last_error_errcode;
1430         __le16  s_encoding;             /* Filename charset encoding */
1431         __le16  s_encoding_flags;       /* Filename charset encoding flags */
1432         __le32  s_orphan_file_inum;     /* Inode for tracking orphan inodes */
1433         __le32  s_reserved[94];         /* Padding to the end of the block */
1434         __le32  s_checksum;             /* crc32c(superblock) */
1435 };
1436
1437 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1438
1439 #ifdef __KERNEL__
1440
1441 #ifdef CONFIG_FS_ENCRYPTION
1442 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1443 #else
1444 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1445 #endif
1446
1447 /* Number of quota types we support */
1448 #define EXT4_MAXQUOTAS 3
1449
1450 #define EXT4_ENC_UTF8_12_1      1
1451
1452 /* Types of ext4 journal triggers */
1453 enum ext4_journal_trigger_type {
1454         EXT4_JTR_ORPHAN_FILE,
1455         EXT4_JTR_NONE   /* This must be the last entry for indexing to work! */
1456 };
1457
1458 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1459
1460 struct ext4_journal_trigger {
1461         struct jbd2_buffer_trigger_type tr_triggers;
1462         struct super_block *sb;
1463 };
1464
1465 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1466                                 struct jbd2_buffer_trigger_type *trigger)
1467 {
1468         return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1469 }
1470
1471 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1472
1473 /* Structure at the tail of orphan block */
1474 struct ext4_orphan_block_tail {
1475         __le32 ob_magic;
1476         __le32 ob_checksum;
1477 };
1478
1479 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1480 {
1481         return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1482                         sizeof(u32);
1483 }
1484
1485 struct ext4_orphan_block {
1486         atomic_t ob_free_entries;       /* Number of free orphan entries in block */
1487         struct buffer_head *ob_bh;      /* Buffer for orphan block */
1488 };
1489
1490 /*
1491  * Info about orphan file.
1492  */
1493 struct ext4_orphan_info {
1494         int of_blocks;                  /* Number of orphan blocks in a file */
1495         __u32 of_csum_seed;             /* Checksum seed for orphan file */
1496         struct ext4_orphan_block *of_binfo;     /* Array with info about orphan
1497                                                  * file blocks */
1498 };
1499
1500 /*
1501  * fourth extended-fs super-block data in memory
1502  */
1503 struct ext4_sb_info {
1504         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
1505         unsigned long s_inodes_per_block;/* Number of inodes per block */
1506         unsigned long s_blocks_per_group;/* Number of blocks in a group */
1507         unsigned long s_clusters_per_group; /* Number of clusters in a group */
1508         unsigned long s_inodes_per_group;/* Number of inodes in a group */
1509         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
1510         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
1511         unsigned long s_desc_per_block; /* Number of group descriptors per block */
1512         ext4_group_t s_groups_count;    /* Number of groups in the fs */
1513         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1514         unsigned long s_overhead;  /* # of fs overhead clusters */
1515         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
1516         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
1517         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
1518         struct buffer_head * s_sbh;     /* Buffer containing the super block */
1519         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
1520         struct buffer_head * __rcu *s_group_desc;
1521         unsigned int s_mount_opt;
1522         unsigned int s_mount_opt2;
1523         unsigned long s_mount_flags;
1524         unsigned int s_def_mount_opt;
1525         ext4_fsblk_t s_sb_block;
1526         atomic64_t s_resv_clusters;
1527         kuid_t s_resuid;
1528         kgid_t s_resgid;
1529         unsigned short s_mount_state;
1530         unsigned short s_pad;
1531         int s_addr_per_block_bits;
1532         int s_desc_per_block_bits;
1533         int s_inode_size;
1534         int s_first_ino;
1535         unsigned int s_inode_readahead_blks;
1536         unsigned int s_inode_goal;
1537         u32 s_hash_seed[4];
1538         int s_def_hash_version;
1539         int s_hash_unsigned;    /* 3 if hash should be unsigned, 0 if not */
1540         struct percpu_counter s_freeclusters_counter;
1541         struct percpu_counter s_freeinodes_counter;
1542         struct percpu_counter s_dirs_counter;
1543         struct percpu_counter s_dirtyclusters_counter;
1544         struct percpu_counter s_sra_exceeded_retry_limit;
1545         struct blockgroup_lock *s_blockgroup_lock;
1546         struct proc_dir_entry *s_proc;
1547         struct kobject s_kobj;
1548         struct completion s_kobj_unregister;
1549         struct super_block *s_sb;
1550         struct buffer_head *s_mmp_bh;
1551
1552         /* Journaling */
1553         struct journal_s *s_journal;
1554         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
1555         struct mutex s_orphan_lock;     /* Protects on disk list changes */
1556         struct list_head s_orphan;      /* List of orphaned inodes in on disk
1557                                            list */
1558         struct ext4_orphan_info s_orphan_info;
1559         unsigned long s_commit_interval;
1560         u32 s_max_batch_time;
1561         u32 s_min_batch_time;
1562         struct block_device *s_journal_bdev;
1563 #ifdef CONFIG_QUOTA
1564         /* Names of quota files with journalled quota */
1565         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1566         int s_jquota_fmt;                       /* Format of quota to use */
1567 #endif
1568         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1569         struct ext4_system_blocks __rcu *s_system_blks;
1570
1571 #ifdef EXTENTS_STATS
1572         /* ext4 extents stats */
1573         unsigned long s_ext_min;
1574         unsigned long s_ext_max;
1575         unsigned long s_depth_max;
1576         spinlock_t s_ext_stats_lock;
1577         unsigned long s_ext_blocks;
1578         unsigned long s_ext_extents;
1579 #endif
1580
1581         /* for buddy allocator */
1582         struct ext4_group_info ** __rcu *s_group_info;
1583         struct inode *s_buddy_cache;
1584         spinlock_t s_md_lock;
1585         unsigned short *s_mb_offsets;
1586         unsigned int *s_mb_maxs;
1587         unsigned int s_group_info_size;
1588         unsigned int s_mb_free_pending;
1589         struct list_head s_freed_data_list;     /* List of blocks to be freed
1590                                                    after commit completed */
1591         struct list_head s_discard_list;
1592         struct work_struct s_discard_work;
1593         atomic_t s_retry_alloc_pending;
1594         struct rb_root s_mb_avg_fragment_size_root;
1595         rwlock_t s_mb_rb_lock;
1596         struct list_head *s_mb_largest_free_orders;
1597         rwlock_t *s_mb_largest_free_orders_locks;
1598
1599         /* tunables */
1600         unsigned long s_stripe;
1601         unsigned int s_mb_max_linear_groups;
1602         unsigned int s_mb_stream_request;
1603         unsigned int s_mb_max_to_scan;
1604         unsigned int s_mb_min_to_scan;
1605         unsigned int s_mb_stats;
1606         unsigned int s_mb_order2_reqs;
1607         unsigned int s_mb_group_prealloc;
1608         unsigned int s_mb_max_inode_prealloc;
1609         unsigned int s_max_dir_size_kb;
1610         /* where last allocation was done - for stream allocation */
1611         unsigned long s_mb_last_group;
1612         unsigned long s_mb_last_start;
1613         unsigned int s_mb_prefetch;
1614         unsigned int s_mb_prefetch_limit;
1615
1616         /* stats for buddy allocator */
1617         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
1618         atomic_t s_bal_success; /* we found long enough chunks */
1619         atomic_t s_bal_allocated;       /* in blocks */
1620         atomic_t s_bal_ex_scanned;      /* total extents scanned */
1621         atomic_t s_bal_groups_scanned;  /* number of groups scanned */
1622         atomic_t s_bal_goals;   /* goal hits */
1623         atomic_t s_bal_breaks;  /* too long searches */
1624         atomic_t s_bal_2orders; /* 2^order hits */
1625         atomic_t s_bal_cr0_bad_suggestions;
1626         atomic_t s_bal_cr1_bad_suggestions;
1627         atomic64_t s_bal_cX_groups_considered[4];
1628         atomic64_t s_bal_cX_hits[4];
1629         atomic64_t s_bal_cX_failed[4];          /* cX loop didn't find blocks */
1630         atomic_t s_mb_buddies_generated;        /* number of buddies generated */
1631         atomic64_t s_mb_generation_time;
1632         atomic_t s_mb_lost_chunks;
1633         atomic_t s_mb_preallocated;
1634         atomic_t s_mb_discarded;
1635         atomic_t s_lock_busy;
1636
1637         /* locality groups */
1638         struct ext4_locality_group __percpu *s_locality_groups;
1639
1640         /* for write statistics */
1641         unsigned long s_sectors_written_start;
1642         u64 s_kbytes_written;
1643
1644         /* the size of zero-out chunk */
1645         unsigned int s_extent_max_zeroout_kb;
1646
1647         unsigned int s_log_groups_per_flex;
1648         struct flex_groups * __rcu *s_flex_groups;
1649         ext4_group_t s_flex_groups_allocated;
1650
1651         /* workqueue for reserved extent conversions (buffered io) */
1652         struct workqueue_struct *rsv_conversion_wq;
1653
1654         /* timer for periodic error stats printing */
1655         struct timer_list s_err_report;
1656
1657         /* Lazy inode table initialization info */
1658         struct ext4_li_request *s_li_request;
1659         /* Wait multiplier for lazy initialization thread */
1660         unsigned int s_li_wait_mult;
1661
1662         /* Kernel thread for multiple mount protection */
1663         struct task_struct *s_mmp_tsk;
1664
1665         /* record the last minlen when FITRIM is called. */
1666         unsigned long s_last_trim_minblks;
1667
1668         /* Reference to checksum algorithm driver via cryptoapi */
1669         struct crypto_shash *s_chksum_driver;
1670
1671         /* Precomputed FS UUID checksum for seeding other checksums */
1672         __u32 s_csum_seed;
1673
1674         /* Reclaim extents from extent status tree */
1675         struct shrinker s_es_shrinker;
1676         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
1677         long s_es_nr_inode;
1678         struct ext4_es_stats s_es_stats;
1679         struct mb_cache *s_ea_block_cache;
1680         struct mb_cache *s_ea_inode_cache;
1681         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1682
1683         /* Journal triggers for checksum computation */
1684         struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1685
1686         /* Ratelimit ext4 messages. */
1687         struct ratelimit_state s_err_ratelimit_state;
1688         struct ratelimit_state s_warning_ratelimit_state;
1689         struct ratelimit_state s_msg_ratelimit_state;
1690         atomic_t s_warning_count;
1691         atomic_t s_msg_count;
1692
1693         /* Encryption policy for '-o test_dummy_encryption' */
1694         struct fscrypt_dummy_policy s_dummy_enc_policy;
1695
1696         /*
1697          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1698          * or EXTENTS flag.
1699          */
1700         struct percpu_rw_semaphore s_writepages_rwsem;
1701         struct dax_device *s_daxdev;
1702         u64 s_dax_part_off;
1703 #ifdef CONFIG_EXT4_DEBUG
1704         unsigned long s_simulate_fail;
1705 #endif
1706         /* Record the errseq of the backing block device */
1707         errseq_t s_bdev_wb_err;
1708         spinlock_t s_bdev_wb_lock;
1709
1710         /* Information about errors that happened during this mount */
1711         spinlock_t s_error_lock;
1712         int s_add_error_count;
1713         int s_first_error_code;
1714         __u32 s_first_error_line;
1715         __u32 s_first_error_ino;
1716         __u64 s_first_error_block;
1717         const char *s_first_error_func;
1718         time64_t s_first_error_time;
1719         int s_last_error_code;
1720         __u32 s_last_error_line;
1721         __u32 s_last_error_ino;
1722         __u64 s_last_error_block;
1723         const char *s_last_error_func;
1724         time64_t s_last_error_time;
1725         /*
1726          * If we are in a context where we cannot update error information in
1727          * the on-disk superblock, we queue this work to do it.
1728          */
1729         struct work_struct s_error_work;
1730
1731         /* Ext4 fast commit sub transaction ID */
1732         atomic_t s_fc_subtid;
1733
1734         /*
1735          * After commit starts, the main queue gets locked, and the further
1736          * updates get added in the staging queue.
1737          */
1738 #define FC_Q_MAIN       0
1739 #define FC_Q_STAGING    1
1740         struct list_head s_fc_q[2];     /* Inodes staged for fast commit
1741                                          * that have data changes in them.
1742                                          */
1743         struct list_head s_fc_dentry_q[2];      /* directory entry updates */
1744         unsigned int s_fc_bytes;
1745         /*
1746          * Main fast commit lock. This lock protects accesses to the
1747          * following fields:
1748          * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1749          */
1750         spinlock_t s_fc_lock;
1751         struct buffer_head *s_fc_bh;
1752         struct ext4_fc_stats s_fc_stats;
1753 #ifdef CONFIG_EXT4_DEBUG
1754         int s_fc_debug_max_replay;
1755 #endif
1756         struct ext4_fc_replay_state s_fc_replay_state;
1757 };
1758
1759 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1760 {
1761         return sb->s_fs_info;
1762 }
1763 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1764 {
1765         return container_of(inode, struct ext4_inode_info, vfs_inode);
1766 }
1767
1768 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1769 {
1770         return ino == EXT4_ROOT_INO ||
1771                 (ino >= EXT4_FIRST_INO(sb) &&
1772                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1773 }
1774
1775 /*
1776  * Returns: sbi->field[index]
1777  * Used to access an array element from the following sbi fields which require
1778  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1779  * - s_group_desc
1780  * - s_group_info
1781  * - s_flex_group
1782  */
1783 #define sbi_array_rcu_deref(sbi, field, index)                             \
1784 ({                                                                         \
1785         typeof(*((sbi)->field)) _v;                                        \
1786         rcu_read_lock();                                                   \
1787         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];          \
1788         rcu_read_unlock();                                                 \
1789         _v;                                                                \
1790 })
1791
1792 /*
1793  * run-time mount flags
1794  */
1795 enum {
1796         EXT4_MF_MNTDIR_SAMPLED,
1797         EXT4_MF_FS_ABORTED,     /* Fatal error detected */
1798         EXT4_MF_FC_INELIGIBLE,  /* Fast commit ineligible */
1799         EXT4_MF_FC_COMMITTING   /* File system underoing a fast
1800                                  * commit.
1801                                  */
1802 };
1803
1804 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1805 {
1806         set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1807 }
1808
1809 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1810 {
1811         clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1812 }
1813
1814 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1815 {
1816         return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1817 }
1818
1819
1820 /*
1821  * Simulate_fail codes
1822  */
1823 #define EXT4_SIM_BBITMAP_EIO    1
1824 #define EXT4_SIM_BBITMAP_CRC    2
1825 #define EXT4_SIM_IBITMAP_EIO    3
1826 #define EXT4_SIM_IBITMAP_CRC    4
1827 #define EXT4_SIM_INODE_EIO      5
1828 #define EXT4_SIM_INODE_CRC      6
1829 #define EXT4_SIM_DIRBLOCK_EIO   7
1830 #define EXT4_SIM_DIRBLOCK_CRC   8
1831
1832 static inline bool ext4_simulate_fail(struct super_block *sb,
1833                                      unsigned long code)
1834 {
1835 #ifdef CONFIG_EXT4_DEBUG
1836         struct ext4_sb_info *sbi = EXT4_SB(sb);
1837
1838         if (unlikely(sbi->s_simulate_fail == code)) {
1839                 sbi->s_simulate_fail = 0;
1840                 return true;
1841         }
1842 #endif
1843         return false;
1844 }
1845
1846 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1847                                          struct buffer_head *bh,
1848                                          unsigned long code)
1849 {
1850         if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1851                 clear_buffer_uptodate(bh);
1852 }
1853
1854 /*
1855  * Error number codes for s_{first,last}_error_errno
1856  *
1857  * Linux errno numbers are architecture specific, so we need to translate
1858  * them into something which is architecture independent.   We don't define
1859  * codes for all errno's; just the ones which are most likely to be the cause
1860  * of an ext4_error() call.
1861  */
1862 #define EXT4_ERR_UNKNOWN         1
1863 #define EXT4_ERR_EIO             2
1864 #define EXT4_ERR_ENOMEM          3
1865 #define EXT4_ERR_EFSBADCRC       4
1866 #define EXT4_ERR_EFSCORRUPTED    5
1867 #define EXT4_ERR_ENOSPC          6
1868 #define EXT4_ERR_ENOKEY          7
1869 #define EXT4_ERR_EROFS           8
1870 #define EXT4_ERR_EFBIG           9
1871 #define EXT4_ERR_EEXIST         10
1872 #define EXT4_ERR_ERANGE         11
1873 #define EXT4_ERR_EOVERFLOW      12
1874 #define EXT4_ERR_EBUSY          13
1875 #define EXT4_ERR_ENOTDIR        14
1876 #define EXT4_ERR_ENOTEMPTY      15
1877 #define EXT4_ERR_ESHUTDOWN      16
1878 #define EXT4_ERR_EFAULT         17
1879
1880 /*
1881  * Inode dynamic state flags
1882  */
1883 enum {
1884         EXT4_STATE_JDATA,               /* journaled data exists */
1885         EXT4_STATE_NEW,                 /* inode is newly created */
1886         EXT4_STATE_XATTR,               /* has in-inode xattrs */
1887         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
1888         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
1889         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
1890         EXT4_STATE_NEWENTRY,            /* File just added to dir */
1891         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
1892         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
1893         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
1894         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
1895         EXT4_STATE_FC_COMMITTING,       /* Fast commit ongoing */
1896         EXT4_STATE_ORPHAN_FILE,         /* Inode orphaned in orphan file */
1897 };
1898
1899 #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
1900 static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
1901 {                                                                       \
1902         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);     \
1903 }                                                                       \
1904 static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
1905 {                                                                       \
1906         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);             \
1907 }                                                                       \
1908 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1909 {                                                                       \
1910         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);           \
1911 }
1912
1913 /* Add these declarations here only so that these functions can be
1914  * found by name.  Otherwise, they are very hard to locate. */
1915 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1916 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1917 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1918 EXT4_INODE_BIT_FNS(flag, flags, 0)
1919
1920 /* Add these declarations here only so that these functions can be
1921  * found by name.  Otherwise, they are very hard to locate. */
1922 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1923 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1924 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1925 #if (BITS_PER_LONG < 64)
1926 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1927
1928 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1929 {
1930         (ei)->i_state_flags = 0;
1931 }
1932 #else
1933 EXT4_INODE_BIT_FNS(state, flags, 32)
1934
1935 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1936 {
1937         /* We depend on the fact that callers will set i_flags */
1938 }
1939 #endif
1940 #else
1941 /* Assume that user mode programs are passing in an ext4fs superblock, not
1942  * a kernel struct super_block.  This will allow us to call the feature-test
1943  * macros from user land. */
1944 #define EXT4_SB(sb)     (sb)
1945 #endif
1946
1947 static inline bool ext4_verity_in_progress(struct inode *inode)
1948 {
1949         return IS_ENABLED(CONFIG_FS_VERITY) &&
1950                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1951 }
1952
1953 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1954
1955 /*
1956  * Codes for operating systems
1957  */
1958 #define EXT4_OS_LINUX           0
1959 #define EXT4_OS_HURD            1
1960 #define EXT4_OS_MASIX           2
1961 #define EXT4_OS_FREEBSD         3
1962 #define EXT4_OS_LITES           4
1963
1964 /*
1965  * Revision levels
1966  */
1967 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
1968 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
1969
1970 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
1971
1972 #define EXT4_GOOD_OLD_INODE_SIZE 128
1973
1974 #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
1975 #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
1976 #define EXT4_TIMESTAMP_MIN              S32_MIN
1977
1978 /*
1979  * Feature set definitions
1980  */
1981
1982 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
1983 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
1984 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
1985 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
1986 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
1987 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
1988 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
1989 /*
1990  * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1991  * incompatible only if fast commit blocks are present in the FS. Since we
1992  * clear the journal (and thus the fast commit blocks), we don't mark FS as
1993  * incompatible. We also have a JBD2 incompat feature, which gets set when
1994  * there are fast commit blocks present in the journal.
1995  */
1996 #define EXT4_FEATURE_COMPAT_FAST_COMMIT         0x0400
1997 #define EXT4_FEATURE_COMPAT_STABLE_INODES       0x0800
1998 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE         0x1000  /* Orphan file exists */
1999
2000 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
2001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
2002 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
2003 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
2004 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
2005 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
2006 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
2007 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
2008 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
2009 /*
2010  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
2011  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2012  * all other data structures' checksums.  However, the METADATA_CSUM and
2013  * GDT_CSUM bits are mutually exclusive.
2014  */
2015 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
2016 #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
2017 #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
2018 #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
2019 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT   0x10000 /* Orphan file may be
2020                                                            non-empty */
2021
2022 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
2023 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
2024 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
2025 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
2026 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
2027 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
2028 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
2029 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
2030 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
2031 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
2032 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
2033 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
2034 #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
2035 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
2036 #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
2037 #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
2038
2039 extern void ext4_update_dynamic_rev(struct super_block *sb);
2040
2041 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2042 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2043 { \
2044         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2045                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2046 } \
2047 static inline void ext4_set_feature_##name(struct super_block *sb) \
2048 { \
2049         ext4_update_dynamic_rev(sb); \
2050         EXT4_SB(sb)->s_es->s_feature_compat |= \
2051                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2052 } \
2053 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2054 { \
2055         EXT4_SB(sb)->s_es->s_feature_compat &= \
2056                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057 }
2058
2059 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2060 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2061 { \
2062         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2063                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2064 } \
2065 static inline void ext4_set_feature_##name(struct super_block *sb) \
2066 { \
2067         ext4_update_dynamic_rev(sb); \
2068         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2069                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2070 } \
2071 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2072 { \
2073         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2074                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075 }
2076
2077 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2078 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2079 { \
2080         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2081                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2082 } \
2083 static inline void ext4_set_feature_##name(struct super_block *sb) \
2084 { \
2085         ext4_update_dynamic_rev(sb); \
2086         EXT4_SB(sb)->s_es->s_feature_incompat |= \
2087                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2088 } \
2089 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2090 { \
2091         EXT4_SB(sb)->s_es->s_feature_incompat &= \
2092                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093 }
2094
2095 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
2096 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
2097 EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
2098 EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
2099 EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
2100 EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
2101 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
2102 EXT4_FEATURE_COMPAT_FUNCS(fast_commit,          FAST_COMMIT)
2103 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes,        STABLE_INODES)
2104 EXT4_FEATURE_COMPAT_FUNCS(orphan_file,          ORPHAN_FILE)
2105
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
2116 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
2117 EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
2118 EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
2119 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present,    ORPHAN_PRESENT)
2120
2121 EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
2133 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
2134 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
2135 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
2136 EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
2137
2138 #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2139 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2140                                          EXT4_FEATURE_INCOMPAT_META_BG)
2141 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2142                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2143                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2144
2145 #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
2146 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2147                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2148                                          EXT4_FEATURE_INCOMPAT_META_BG)
2149 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2150                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2151                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2152
2153 #define EXT4_FEATURE_COMPAT_SUPP        (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2154                                          EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2155 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2156                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
2157                                          EXT4_FEATURE_INCOMPAT_META_BG| \
2158                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
2159                                          EXT4_FEATURE_INCOMPAT_64BIT| \
2160                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2161                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
2162                                          EXT4_FEATURE_INCOMPAT_MMP | \
2163                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2164                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2165                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2166                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2167                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
2168 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2169                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2170                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2171                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2172                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2173                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2174                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2175                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2176                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2177                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
2178                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
2179                                          EXT4_FEATURE_RO_COMPAT_VERITY |\
2180                                          EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2181
2182 #define EXTN_FEATURE_FUNCS(ver) \
2183 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2184 { \
2185         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2186                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2187 } \
2188 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2189 { \
2190         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2191                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2192 } \
2193 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2194 { \
2195         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2196                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2197 }
2198
2199 EXTN_FEATURE_FUNCS(2)
2200 EXTN_FEATURE_FUNCS(3)
2201 EXTN_FEATURE_FUNCS(4)
2202
2203 static inline bool ext4_has_compat_features(struct super_block *sb)
2204 {
2205         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2206 }
2207 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2208 {
2209         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2210 }
2211 static inline bool ext4_has_incompat_features(struct super_block *sb)
2212 {
2213         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2214 }
2215
2216 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2217
2218 /*
2219  * Superblock flags
2220  */
2221 #define EXT4_FLAGS_RESIZING     0
2222 #define EXT4_FLAGS_SHUTDOWN     1
2223 #define EXT4_FLAGS_BDEV_IS_DAX  2
2224
2225 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2226 {
2227         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2228 }
2229
2230 /*
2231  * Default values for user and/or group using reserved blocks
2232  */
2233 #define EXT4_DEF_RESUID         0
2234 #define EXT4_DEF_RESGID         0
2235
2236 /*
2237  * Default project ID
2238  */
2239 #define EXT4_DEF_PROJID         0
2240
2241 #define EXT4_DEF_INODE_READAHEAD_BLKS   32
2242
2243 /*
2244  * Default mount options
2245  */
2246 #define EXT4_DEFM_DEBUG         0x0001
2247 #define EXT4_DEFM_BSDGROUPS     0x0002
2248 #define EXT4_DEFM_XATTR_USER    0x0004
2249 #define EXT4_DEFM_ACL           0x0008
2250 #define EXT4_DEFM_UID16         0x0010
2251 #define EXT4_DEFM_JMODE         0x0060
2252 #define EXT4_DEFM_JMODE_DATA    0x0020
2253 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2254 #define EXT4_DEFM_JMODE_WBACK   0x0060
2255 #define EXT4_DEFM_NOBARRIER     0x0100
2256 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2257 #define EXT4_DEFM_DISCARD       0x0400
2258 #define EXT4_DEFM_NODELALLOC    0x0800
2259
2260 /*
2261  * Default journal batch times
2262  */
2263 #define EXT4_DEF_MIN_BATCH_TIME 0
2264 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2265
2266 /*
2267  * Minimum number of groups in a flexgroup before we separate out
2268  * directories into the first block group of a flexgroup
2269  */
2270 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2271
2272 /*
2273  * Structure of a directory entry
2274  */
2275 #define EXT4_NAME_LEN 255
2276
2277 struct ext4_dir_entry {
2278         __le32  inode;                  /* Inode number */
2279         __le16  rec_len;                /* Directory entry length */
2280         __le16  name_len;               /* Name length */
2281         char    name[EXT4_NAME_LEN];    /* File name */
2282 };
2283
2284
2285 /*
2286  * Encrypted Casefolded entries require saving the hash on disk. This structure
2287  * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2288  * boundary.
2289  */
2290 struct ext4_dir_entry_hash {
2291         __le32 hash;
2292         __le32 minor_hash;
2293 };
2294
2295 /*
2296  * The new version of the directory entry.  Since EXT4 structures are
2297  * stored in intel byte order, and the name_len field could never be
2298  * bigger than 255 chars, it's safe to reclaim the extra byte for the
2299  * file_type field.
2300  */
2301 struct ext4_dir_entry_2 {
2302         __le32  inode;                  /* Inode number */
2303         __le16  rec_len;                /* Directory entry length */
2304         __u8    name_len;               /* Name length */
2305         __u8    file_type;              /* See file type macros EXT4_FT_* below */
2306         char    name[EXT4_NAME_LEN];    /* File name */
2307 };
2308
2309 /*
2310  * Access the hashes at the end of ext4_dir_entry_2
2311  */
2312 #define EXT4_DIRENT_HASHES(entry) \
2313         ((struct ext4_dir_entry_hash *) \
2314                 (((void *)(entry)) + \
2315                 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2316 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2317 #define EXT4_DIRENT_MINOR_HASH(entry) \
2318                 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2319
2320 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2321 {
2322         return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2323 }
2324
2325 /*
2326  * This is a bogus directory entry at the end of each leaf block that
2327  * records checksums.
2328  */
2329 struct ext4_dir_entry_tail {
2330         __le32  det_reserved_zero1;     /* Pretend to be unused */
2331         __le16  det_rec_len;            /* 12 */
2332         __u8    det_reserved_zero2;     /* Zero name length */
2333         __u8    det_reserved_ft;        /* 0xDE, fake file type */
2334         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
2335 };
2336
2337 #define EXT4_DIRENT_TAIL(block, blocksize) \
2338         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2339                                         ((blocksize) - \
2340                                          sizeof(struct ext4_dir_entry_tail))))
2341
2342 /*
2343  * Ext4 directory file types.  Only the low 3 bits are used.  The
2344  * other bits are reserved for now.
2345  */
2346 #define EXT4_FT_UNKNOWN         0
2347 #define EXT4_FT_REG_FILE        1
2348 #define EXT4_FT_DIR             2
2349 #define EXT4_FT_CHRDEV          3
2350 #define EXT4_FT_BLKDEV          4
2351 #define EXT4_FT_FIFO            5
2352 #define EXT4_FT_SOCK            6
2353 #define EXT4_FT_SYMLINK         7
2354
2355 #define EXT4_FT_MAX             8
2356
2357 #define EXT4_FT_DIR_CSUM        0xDE
2358
2359 /*
2360  * EXT4_DIR_PAD defines the directory entries boundaries
2361  *
2362  * NOTE: It must be a multiple of 4
2363  */
2364 #define EXT4_DIR_PAD                    4
2365 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
2366 #define EXT4_MAX_REC_LEN                ((1<<16)-1)
2367
2368 /*
2369  * The rec_len is dependent on the type of directory. Directories that are
2370  * casefolded and encrypted need to store the hash as well, so we add room for
2371  * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2372  * pass NULL for dir, as those entries do not use the extra fields.
2373  */
2374 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2375                                                 const struct inode *dir)
2376 {
2377         int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2378
2379         if (dir && ext4_hash_in_dirent(dir))
2380                 rec_len += sizeof(struct ext4_dir_entry_hash);
2381         return (rec_len & ~EXT4_DIR_ROUND);
2382 }
2383
2384 /*
2385  * If we ever get support for fs block sizes > page_size, we'll need
2386  * to remove the #if statements in the next two functions...
2387  */
2388 static inline unsigned int
2389 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2390 {
2391         unsigned len = le16_to_cpu(dlen);
2392
2393 #if (PAGE_SIZE >= 65536)
2394         if (len == EXT4_MAX_REC_LEN || len == 0)
2395                 return blocksize;
2396         return (len & 65532) | ((len & 3) << 16);
2397 #else
2398         return len;
2399 #endif
2400 }
2401
2402 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2403 {
2404         BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2405 #if (PAGE_SIZE >= 65536)
2406         if (len < 65536)
2407                 return cpu_to_le16(len);
2408         if (len == blocksize) {
2409                 if (blocksize == 65536)
2410                         return cpu_to_le16(EXT4_MAX_REC_LEN);
2411                 else
2412                         return cpu_to_le16(0);
2413         }
2414         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2415 #else
2416         return cpu_to_le16(len);
2417 #endif
2418 }
2419
2420 /*
2421  * Hash Tree Directory indexing
2422  * (c) Daniel Phillips, 2001
2423  */
2424
2425 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2426                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2427 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2428                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2429 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2430
2431 /* Legal values for the dx_root hash_version field: */
2432
2433 #define DX_HASH_LEGACY                  0
2434 #define DX_HASH_HALF_MD4                1
2435 #define DX_HASH_TEA                     2
2436 #define DX_HASH_LEGACY_UNSIGNED         3
2437 #define DX_HASH_HALF_MD4_UNSIGNED       4
2438 #define DX_HASH_TEA_UNSIGNED            5
2439 #define DX_HASH_SIPHASH                 6
2440
2441 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2442                               const void *address, unsigned int length)
2443 {
2444         struct {
2445                 struct shash_desc shash;
2446                 char ctx[4];
2447         } desc;
2448
2449         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2450
2451         desc.shash.tfm = sbi->s_chksum_driver;
2452         *(u32 *)desc.ctx = crc;
2453
2454         BUG_ON(crypto_shash_update(&desc.shash, address, length));
2455
2456         return *(u32 *)desc.ctx;
2457 }
2458
2459 #ifdef __KERNEL__
2460
2461 /* hash info structure used by the directory hash */
2462 struct dx_hash_info
2463 {
2464         u32             hash;
2465         u32             minor_hash;
2466         int             hash_version;
2467         u32             *seed;
2468 };
2469
2470
2471 /* 32 and 64 bit signed EOF for dx directories */
2472 #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
2473 #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
2474
2475
2476 /*
2477  * Control parameters used by ext4_htree_next_block
2478  */
2479 #define HASH_NB_ALWAYS          1
2480
2481 struct ext4_filename {
2482         const struct qstr *usr_fname;
2483         struct fscrypt_str disk_name;
2484         struct dx_hash_info hinfo;
2485 #ifdef CONFIG_FS_ENCRYPTION
2486         struct fscrypt_str crypto_buf;
2487 #endif
2488 #ifdef CONFIG_UNICODE
2489         struct fscrypt_str cf_name;
2490 #endif
2491 };
2492
2493 #define fname_name(p) ((p)->disk_name.name)
2494 #define fname_usr_name(p) ((p)->usr_fname->name)
2495 #define fname_len(p)  ((p)->disk_name.len)
2496
2497 /*
2498  * Describe an inode's exact location on disk and in memory
2499  */
2500 struct ext4_iloc
2501 {
2502         struct buffer_head *bh;
2503         unsigned long offset;
2504         ext4_group_t block_group;
2505 };
2506
2507 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2508 {
2509         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2510 }
2511
2512 static inline bool ext4_is_quota_file(struct inode *inode)
2513 {
2514         return IS_NOQUOTA(inode) &&
2515                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2516 }
2517
2518 /*
2519  * This structure is stuffed into the struct file's private_data field
2520  * for directories.  It is where we put information so that we can do
2521  * readdir operations in hash tree order.
2522  */
2523 struct dir_private_info {
2524         struct rb_root  root;
2525         struct rb_node  *curr_node;
2526         struct fname    *extra_fname;
2527         loff_t          last_pos;
2528         __u32           curr_hash;
2529         __u32           curr_minor_hash;
2530         __u32           next_hash;
2531 };
2532
2533 /* calculate the first block number of the group */
2534 static inline ext4_fsblk_t
2535 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2536 {
2537         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2538                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2539 }
2540
2541 /*
2542  * Special error return code only used by dx_probe() and its callers.
2543  */
2544 #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
2545
2546 /* htree levels for ext4 */
2547 #define EXT4_HTREE_LEVEL_COMPAT 2
2548 #define EXT4_HTREE_LEVEL        3
2549
2550 static inline int ext4_dir_htree_level(struct super_block *sb)
2551 {
2552         return ext4_has_feature_largedir(sb) ?
2553                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2554 }
2555
2556 /*
2557  * Timeout and state flag for lazy initialization inode thread.
2558  */
2559 #define EXT4_DEF_LI_WAIT_MULT                   10
2560 #define EXT4_DEF_LI_MAX_START_DELAY             5
2561 #define EXT4_LAZYINIT_QUIT                      0x0001
2562 #define EXT4_LAZYINIT_RUNNING                   0x0002
2563
2564 /*
2565  * Lazy inode table initialization info
2566  */
2567 struct ext4_lazy_init {
2568         unsigned long           li_state;
2569         struct list_head        li_request_list;
2570         struct mutex            li_list_mtx;
2571 };
2572
2573 enum ext4_li_mode {
2574         EXT4_LI_MODE_PREFETCH_BBITMAP,
2575         EXT4_LI_MODE_ITABLE,
2576 };
2577
2578 struct ext4_li_request {
2579         struct super_block      *lr_super;
2580         enum ext4_li_mode       lr_mode;
2581         ext4_group_t            lr_first_not_zeroed;
2582         ext4_group_t            lr_next_group;
2583         struct list_head        lr_request;
2584         unsigned long           lr_next_sched;
2585         unsigned long           lr_timeout;
2586 };
2587
2588 struct ext4_features {
2589         struct kobject f_kobj;
2590         struct completion f_kobj_unregister;
2591 };
2592
2593 /*
2594  * This structure will be used for multiple mount protection. It will be
2595  * written into the block number saved in the s_mmp_block field in the
2596  * superblock. Programs that check MMP should assume that if
2597  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2598  * to use the filesystem, regardless of how old the timestamp is.
2599  */
2600 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
2601 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2602 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
2603 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
2604
2605 struct mmp_struct {
2606         __le32  mmp_magic;              /* Magic number for MMP */
2607         __le32  mmp_seq;                /* Sequence no. updated periodically */
2608
2609         /*
2610          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2611          * purposes and do not affect the correctness of the algorithm
2612          */
2613         __le64  mmp_time;               /* Time last updated */
2614         char    mmp_nodename[64];       /* Node which last updated MMP block */
2615         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
2616
2617         /*
2618          * mmp_check_interval is used to verify if the MMP block has been
2619          * updated on the block device. The value is updated based on the
2620          * maximum time to write the MMP block during an update cycle.
2621          */
2622         __le16  mmp_check_interval;
2623
2624         __le16  mmp_pad1;
2625         __le32  mmp_pad2[226];
2626         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
2627 };
2628
2629 /* arguments passed to the mmp thread */
2630 struct mmpd_data {
2631         struct buffer_head *bh; /* bh from initial read_mmp_block() */
2632         struct super_block *sb;  /* super block of the fs */
2633 };
2634
2635 /*
2636  * Check interval multiplier
2637  * The MMP block is written every update interval and initially checked every
2638  * update interval x the multiplier (the value is then adapted based on the
2639  * write latency). The reason is that writes can be delayed under load and we
2640  * don't want readers to incorrectly assume that the filesystem is no longer
2641  * in use.
2642  */
2643 #define EXT4_MMP_CHECK_MULT             2UL
2644
2645 /*
2646  * Minimum interval for MMP checking in seconds.
2647  */
2648 #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
2649
2650 /*
2651  * Maximum interval for MMP checking in seconds.
2652  */
2653 #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
2654
2655 /*
2656  * Function prototypes
2657  */
2658
2659 /*
2660  * Ok, these declarations are also in <linux/kernel.h> but none of the
2661  * ext4 source programs needs to include it so they are duplicated here.
2662  */
2663 # define NORET_TYPE     /**/
2664 # define ATTRIB_NORET   __attribute__((noreturn))
2665 # define NORET_AND      noreturn,
2666
2667 /* bitmap.c */
2668 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2669 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2670                                 struct ext4_group_desc *gdp,
2671                                 struct buffer_head *bh, int sz);
2672 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2673                                   struct ext4_group_desc *gdp,
2674                                   struct buffer_head *bh, int sz);
2675 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2676                                 struct ext4_group_desc *gdp,
2677                                 struct buffer_head *bh);
2678 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2679                                   struct ext4_group_desc *gdp,
2680                                   struct buffer_head *bh);
2681
2682 /* balloc.c */
2683 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2684                                          ext4_fsblk_t blocknr,
2685                                          ext4_group_t *blockgrpp,
2686                                          ext4_grpblk_t *offsetp);
2687 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2688                                           ext4_fsblk_t block);
2689
2690 extern unsigned int ext4_block_group(struct super_block *sb,
2691                         ext4_fsblk_t blocknr);
2692 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2693                         ext4_fsblk_t blocknr);
2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696                         ext4_group_t group);
2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698                                          ext4_fsblk_t goal,
2699                                          unsigned int flags,
2700                                          unsigned long *count,
2701                                          int *errp);
2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703                                     s64 nclusters, unsigned int flags);
2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 extern void ext4_check_blocks_bitmap(struct super_block *);
2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707                                                     ext4_group_t block_group,
2708                                                     struct buffer_head ** bh);
2709 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2710
2711 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2712                                                 ext4_group_t block_group,
2713                                                 bool ignore_locked);
2714 extern int ext4_wait_block_bitmap(struct super_block *sb,
2715                                   ext4_group_t block_group,
2716                                   struct buffer_head *bh);
2717 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2718                                                   ext4_group_t block_group);
2719 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2720                                               ext4_group_t block_group,
2721                                               struct ext4_group_desc *gdp);
2722 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2723
2724 #ifdef CONFIG_UNICODE
2725 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2726                                          const struct qstr *iname,
2727                                          struct ext4_filename *fname);
2728 #endif
2729
2730 #ifdef CONFIG_FS_ENCRYPTION
2731 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2732                                                 const struct fscrypt_name *src)
2733 {
2734         memset(dst, 0, sizeof(*dst));
2735
2736         dst->usr_fname = src->usr_fname;
2737         dst->disk_name = src->disk_name;
2738         dst->hinfo.hash = src->hash;
2739         dst->hinfo.minor_hash = src->minor_hash;
2740         dst->crypto_buf = src->crypto_buf;
2741 }
2742
2743 static inline int ext4_fname_setup_filename(struct inode *dir,
2744                                             const struct qstr *iname,
2745                                             int lookup,
2746                                             struct ext4_filename *fname)
2747 {
2748         struct fscrypt_name name;
2749         int err;
2750
2751         err = fscrypt_setup_filename(dir, iname, lookup, &name);
2752         if (err)
2753                 return err;
2754
2755         ext4_fname_from_fscrypt_name(fname, &name);
2756
2757 #ifdef CONFIG_UNICODE
2758         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2759 #endif
2760         return err;
2761 }
2762
2763 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2764                                             struct dentry *dentry,
2765                                             struct ext4_filename *fname)
2766 {
2767         struct fscrypt_name name;
2768         int err;
2769
2770         err = fscrypt_prepare_lookup(dir, dentry, &name);
2771         if (err)
2772                 return err;
2773
2774         ext4_fname_from_fscrypt_name(fname, &name);
2775
2776 #ifdef CONFIG_UNICODE
2777         err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname);
2778 #endif
2779         return err;
2780 }
2781
2782 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2783 {
2784         struct fscrypt_name name;
2785
2786         name.crypto_buf = fname->crypto_buf;
2787         fscrypt_free_filename(&name);
2788
2789         fname->crypto_buf.name = NULL;
2790         fname->usr_fname = NULL;
2791         fname->disk_name.name = NULL;
2792
2793 #ifdef CONFIG_UNICODE
2794         kfree(fname->cf_name.name);
2795         fname->cf_name.name = NULL;
2796 #endif
2797 }
2798 #else /* !CONFIG_FS_ENCRYPTION */
2799 static inline int ext4_fname_setup_filename(struct inode *dir,
2800                                             const struct qstr *iname,
2801                                             int lookup,
2802                                             struct ext4_filename *fname)
2803 {
2804         int err = 0;
2805         fname->usr_fname = iname;
2806         fname->disk_name.name = (unsigned char *) iname->name;
2807         fname->disk_name.len = iname->len;
2808
2809 #ifdef CONFIG_UNICODE
2810         err = ext4_fname_setup_ci_filename(dir, iname, fname);
2811 #endif
2812
2813         return err;
2814 }
2815
2816 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2817                                             struct dentry *dentry,
2818                                             struct ext4_filename *fname)
2819 {
2820         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2821 }
2822
2823 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2824 {
2825 #ifdef CONFIG_UNICODE
2826         kfree(fname->cf_name.name);
2827         fname->cf_name.name = NULL;
2828 #endif
2829 }
2830 #endif /* !CONFIG_FS_ENCRYPTION */
2831
2832 /* dir.c */
2833 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2834                                   struct file *,
2835                                   struct ext4_dir_entry_2 *,
2836                                   struct buffer_head *, char *, int,
2837                                   unsigned int);
2838 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2839         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2840                                 (de), (bh), (buf), (size), (offset)))
2841 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2842                                 __u32 minor_hash,
2843                                 struct ext4_dir_entry_2 *dirent,
2844                                 struct fscrypt_str *ent_name);
2845 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2846 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2847                              struct buffer_head *bh,
2848                              void *buf, int buf_size,
2849                              struct ext4_filename *fname,
2850                              struct ext4_dir_entry_2 **dest_de);
2851 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2852                         struct ext4_dir_entry_2 *de,
2853                         int buf_size,
2854                         struct ext4_filename *fname);
2855 static inline void ext4_update_dx_flag(struct inode *inode)
2856 {
2857         if (!ext4_has_feature_dir_index(inode->i_sb) &&
2858             ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2859                 /* ext4_iget() should have caught this... */
2860                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2861                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2862         }
2863 }
2864 static const unsigned char ext4_filetype_table[] = {
2865         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2866 };
2867
2868 static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
2869 {
2870         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2871                 return DT_UNKNOWN;
2872
2873         return ext4_filetype_table[filetype];
2874 }
2875 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2876                              void *buf, int buf_size);
2877
2878 /* fsync.c */
2879 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2880
2881 /* hash.c */
2882 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2883                           struct dx_hash_info *hinfo);
2884
2885 /* ialloc.c */
2886 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2887 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2888                                       struct inode *, umode_t,
2889                                       const struct qstr *qstr, __u32 goal,
2890                                       uid_t *owner, __u32 i_flags,
2891                                       int handle_type, unsigned int line_no,
2892                                       int nblocks);
2893
2894 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
2895         __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
2896                          (goal), (owner), i_flags, 0, 0, 0)
2897 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2898                                     type, nblocks)                  \
2899         __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2900                          0, (type), __LINE__, (nblocks))
2901
2902
2903 extern void ext4_free_inode(handle_t *, struct inode *);
2904 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2905 extern unsigned long ext4_count_free_inodes(struct super_block *);
2906 extern unsigned long ext4_count_dirs(struct super_block *);
2907 extern void ext4_check_inodes_bitmap(struct super_block *);
2908 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2909 extern int ext4_init_inode_table(struct super_block *sb,
2910                                  ext4_group_t group, int barrier);
2911 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2912
2913 /* fast_commit.c */
2914 int ext4_fc_info_show(struct seq_file *seq, void *v);
2915 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2916 void ext4_fc_init_inode(struct inode *inode);
2917 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2918                          ext4_lblk_t end);
2919 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2920         struct dentry *dentry);
2921 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2922         struct dentry *dentry);
2923 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2924 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2925 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2926                             struct dentry *dentry);
2927 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2928 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2929 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2930 void ext4_fc_start_update(struct inode *inode);
2931 void ext4_fc_stop_update(struct inode *inode);
2932 void ext4_fc_del(struct inode *inode);
2933 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2934 void ext4_fc_replay_cleanup(struct super_block *sb);
2935 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2936 int __init ext4_fc_init_dentry_cache(void);
2937 void ext4_fc_destroy_dentry_cache(void);
2938
2939 /* mballoc.c */
2940 extern const struct seq_operations ext4_mb_seq_groups_ops;
2941 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2942 extern long ext4_mb_stats;
2943 extern long ext4_mb_max_to_scan;
2944 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2945 extern int ext4_mb_init(struct super_block *);
2946 extern int ext4_mb_release(struct super_block *);
2947 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2948                                 struct ext4_allocation_request *, int *);
2949 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2950 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2951 extern int __init ext4_init_mballoc(void);
2952 extern void ext4_exit_mballoc(void);
2953 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2954                                      ext4_group_t group,
2955                                      unsigned int nr, int *cnt);
2956 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2957                                   unsigned int nr);
2958
2959 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2960                              struct buffer_head *bh, ext4_fsblk_t block,
2961                              unsigned long count, int flags);
2962 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2963                                    ext4_group_t ngroups);
2964 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2965                 ext4_group_t i, struct ext4_group_desc *desc);
2966 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2967                                 ext4_fsblk_t block, unsigned long count);
2968 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2969 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2970 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2971                        int len, int state);
2972
2973 /* inode.c */
2974 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2975                          struct ext4_inode_info *ei);
2976 int ext4_inode_is_fast_symlink(struct inode *inode);
2977 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2978 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2979 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2980                      bool wait, struct buffer_head **bhs);
2981 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2982                              struct buffer_head *bh_result, int create);
2983 int ext4_get_block(struct inode *inode, sector_t iblock,
2984                    struct buffer_head *bh_result, int create);
2985 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2986                            struct buffer_head *bh, int create);
2987 int ext4_walk_page_buffers(handle_t *handle,
2988                            struct inode *inode,
2989                            struct buffer_head *head,
2990                            unsigned from,
2991                            unsigned to,
2992                            int *partial,
2993                            int (*fn)(handle_t *handle, struct inode *inode,
2994                                      struct buffer_head *bh));
2995 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2996                                 struct buffer_head *bh);
2997 #define FALL_BACK_TO_NONDELALLOC 1
2998 #define CONVERT_INLINE_DATA      2
2999
3000 typedef enum {
3001         EXT4_IGET_NORMAL =      0,
3002         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
3003         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
3004 } ext4_iget_flags;
3005
3006 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
3007                                  ext4_iget_flags flags, const char *function,
3008                                  unsigned int line);
3009
3010 #define ext4_iget(sb, ino, flags) \
3011         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3012
3013 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
3014 extern int  ext4_setattr(struct user_namespace *, struct dentry *,
3015                          struct iattr *);
3016 extern int  ext4_getattr(struct user_namespace *, const struct path *,
3017                          struct kstat *, u32, unsigned int);
3018 extern void ext4_evict_inode(struct inode *);
3019 extern void ext4_clear_inode(struct inode *);
3020 extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
3021                               struct kstat *, u32, unsigned int);
3022 extern int  ext4_sync_inode(handle_t *, struct inode *);
3023 extern void ext4_dirty_inode(struct inode *, int);
3024 extern int ext4_change_inode_journal_flag(struct inode *, int);
3025 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3026 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3027                           struct ext4_iloc *iloc);
3028 extern int ext4_inode_attach_jinode(struct inode *inode);
3029 extern int ext4_can_truncate(struct inode *inode);
3030 extern int ext4_truncate(struct inode *);
3031 extern int ext4_break_layouts(struct inode *);
3032 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
3033 extern void ext4_set_inode_flags(struct inode *, bool init);
3034 extern int ext4_alloc_da_blocks(struct inode *inode);
3035 extern void ext4_set_aops(struct inode *inode);
3036 extern int ext4_writepage_trans_blocks(struct inode *);
3037 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3038 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3039                              loff_t lstart, loff_t lend);
3040 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3041 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3042 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3043 extern void ext4_da_release_space(struct inode *inode, int to_free);
3044 extern void ext4_da_update_reserve_space(struct inode *inode,
3045                                         int used, int quota_claim);
3046 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3047                               ext4_fsblk_t pblk, ext4_lblk_t len);
3048
3049 /* indirect.c */
3050 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3051                                 struct ext4_map_blocks *map, int flags);
3052 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3053 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3054 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3055                                  ext4_lblk_t start, ext4_lblk_t end);
3056
3057 /* ioctl.c */
3058 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3059 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3060 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3061                       struct dentry *dentry, struct fileattr *fa);
3062 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3063 extern void ext4_reset_inode_seed(struct inode *inode);
3064
3065 /* migrate.c */
3066 extern int ext4_ext_migrate(struct inode *);
3067 extern int ext4_ind_migrate(struct inode *inode);
3068
3069 /* namei.c */
3070 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3071                              struct inode *inode);
3072 extern int ext4_dirblock_csum_verify(struct inode *inode,
3073                                      struct buffer_head *bh);
3074 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3075                                 __u32 start_minor_hash, __u32 *next_hash);
3076 extern int ext4_search_dir(struct buffer_head *bh,
3077                            char *search_buf,
3078                            int buf_size,
3079                            struct inode *dir,
3080                            struct ext4_filename *fname,
3081                            unsigned int offset,
3082                            struct ext4_dir_entry_2 **res_dir);
3083 extern int ext4_generic_delete_entry(struct inode *dir,
3084                                      struct ext4_dir_entry_2 *de_del,
3085                                      struct buffer_head *bh,
3086                                      void *entry_buf,
3087                                      int buf_size,
3088                                      int csum_size);
3089 extern bool ext4_empty_dir(struct inode *inode);
3090
3091 /* resize.c */
3092 extern void ext4_kvfree_array_rcu(void *to_free);
3093 extern int ext4_group_add(struct super_block *sb,
3094                                 struct ext4_new_group_data *input);
3095 extern int ext4_group_extend(struct super_block *sb,
3096                                 struct ext4_super_block *es,
3097                                 ext4_fsblk_t n_blocks_count);
3098 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3099 extern unsigned int ext4_list_backups(struct super_block *sb,
3100                                       unsigned int *three, unsigned int *five,
3101                                       unsigned int *seven);
3102
3103 /* super.c */
3104 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3105                                          sector_t block, int op_flags);
3106 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3107                                                    sector_t block);
3108 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3109                                 bh_end_io_t *end_io);
3110 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3111                         bh_end_io_t *end_io);
3112 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3113 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3114 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3115 extern int ext4_calculate_overhead(struct super_block *sb);
3116 extern __le32 ext4_superblock_csum(struct super_block *sb,
3117                                    struct ext4_super_block *es);
3118 extern void ext4_superblock_csum_set(struct super_block *sb);
3119 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3120                                     ext4_group_t ngroup);
3121 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3122                                      char nbuf[16]);
3123 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3124                                              ext4_group_t block_group,
3125                                              unsigned int flags);
3126
3127 extern __printf(7, 8)
3128 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3129                   int, __u64, const char *, ...);
3130 extern __printf(6, 7)
3131 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3132                         ext4_fsblk_t, int, const char *, ...);
3133 extern __printf(5, 6)
3134 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3135                      const char *, ...);
3136 extern void __ext4_std_error(struct super_block *, const char *,
3137                              unsigned int, int);
3138 extern __printf(4, 5)
3139 void __ext4_warning(struct super_block *, const char *, unsigned int,
3140                     const char *, ...);
3141 extern __printf(4, 5)
3142 void __ext4_warning_inode(const struct inode *inode, const char *function,
3143                           unsigned int line, const char *fmt, ...);
3144 extern __printf(3, 4)
3145 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3146 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3147                            const char *, unsigned int, const char *);
3148 extern __printf(7, 8)
3149 void __ext4_grp_locked_error(const char *, unsigned int,
3150                              struct super_block *, ext4_group_t,
3151                              unsigned long, ext4_fsblk_t,
3152                              const char *, ...);
3153
3154 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3155         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3156
3157 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...)                     \
3158         __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3159
3160 #define ext4_error_inode_block(inode, block, err, fmt, a...)            \
3161         __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3162                            (fmt), ## a)
3163
3164 #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
3165         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3166
3167 #define ext4_abort(sb, err, fmt, a...)                                  \
3168         __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3169
3170 #ifdef CONFIG_PRINTK
3171
3172 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3173         __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3174 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3175         __ext4_error_inode((inode), (func), (line), (block),            \
3176                            (err), (fmt), ##__VA_ARGS__)
3177 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3178         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3179 #define ext4_error(sb, fmt, ...)                                        \
3180         __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt),      \
3181                 ##__VA_ARGS__)
3182 #define ext4_error_err(sb, err, fmt, ...)                               \
3183         __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt),  \
3184                 ##__VA_ARGS__)
3185 #define ext4_warning(sb, fmt, ...)                                      \
3186         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3187 #define ext4_warning_inode(inode, fmt, ...)                             \
3188         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3189 #define ext4_msg(sb, level, fmt, ...)                           \
3190         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3191 #define dump_mmp_msg(sb, mmp, msg)                                      \
3192         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3193 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3194         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3195                                 fmt, ##__VA_ARGS__)
3196
3197 #else
3198
3199 #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
3200 do {                                                                    \
3201         no_printk(fmt, ##__VA_ARGS__);                                  \
3202         __ext4_error_inode(inode, "", 0, block, 0, " ");                \
3203 } while (0)
3204 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...)   \
3205 do {                                                                    \
3206         no_printk(fmt, ##__VA_ARGS__);                                  \
3207         __ext4_error_inode(inode, "", 0, block, err, " ");              \
3208 } while (0)
3209 #define ext4_error_file(file, func, line, block, fmt, ...)              \
3210 do {                                                                    \
3211         no_printk(fmt, ##__VA_ARGS__);                                  \
3212         __ext4_error_file(file, "", 0, block, " ");                     \
3213 } while (0)
3214 #define ext4_error(sb, fmt, ...)                                        \
3215 do {                                                                    \
3216         no_printk(fmt, ##__VA_ARGS__);                                  \
3217         __ext4_error(sb, "", 0, false, 0, 0, " ");                      \
3218 } while (0)
3219 #define ext4_error_err(sb, err, fmt, ...)                               \
3220 do {                                                                    \
3221         no_printk(fmt, ##__VA_ARGS__);                                  \
3222         __ext4_error(sb, "", 0, false, err, 0, " ");                    \
3223 } while (0)
3224 #define ext4_warning(sb, fmt, ...)                                      \
3225 do {                                                                    \
3226         no_printk(fmt, ##__VA_ARGS__);                                  \
3227         __ext4_warning(sb, "", 0, " ");                                 \
3228 } while (0)
3229 #define ext4_warning_inode(inode, fmt, ...)                             \
3230 do {                                                                    \
3231         no_printk(fmt, ##__VA_ARGS__);                                  \
3232         __ext4_warning_inode(inode, "", 0, " ");                        \
3233 } while (0)
3234 #define ext4_msg(sb, level, fmt, ...)                                   \
3235 do {                                                                    \
3236         no_printk(fmt, ##__VA_ARGS__);                                  \
3237         __ext4_msg(sb, "", " ");                                        \
3238 } while (0)
3239 #define dump_mmp_msg(sb, mmp, msg)                                      \
3240         __dump_mmp_msg(sb, mmp, "", 0, "")
3241 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
3242 do {                                                                    \
3243         no_printk(fmt, ##__VA_ARGS__);                          \
3244         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");       \
3245 } while (0)
3246
3247 #endif
3248
3249 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3250                                       struct ext4_group_desc *bg);
3251 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3252                                       struct ext4_group_desc *bg);
3253 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3254                                      struct ext4_group_desc *bg);
3255 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3256                                       struct ext4_group_desc *bg);
3257 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3258                                  struct ext4_group_desc *bg);
3259 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3260                                 struct ext4_group_desc *bg);
3261 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3262                                    struct ext4_group_desc *bg);
3263 extern void ext4_block_bitmap_set(struct super_block *sb,
3264                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3265 extern void ext4_inode_bitmap_set(struct super_block *sb,
3266                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
3267 extern void ext4_inode_table_set(struct super_block *sb,
3268                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
3269 extern void ext4_free_group_clusters_set(struct super_block *sb,
3270                                          struct ext4_group_desc *bg,
3271                                          __u32 count);
3272 extern void ext4_free_inodes_set(struct super_block *sb,
3273                                 struct ext4_group_desc *bg, __u32 count);
3274 extern void ext4_used_dirs_set(struct super_block *sb,
3275                                 struct ext4_group_desc *bg, __u32 count);
3276 extern void ext4_itable_unused_set(struct super_block *sb,
3277                                    struct ext4_group_desc *bg, __u32 count);
3278 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3279                                        struct ext4_group_desc *gdp);
3280 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3281                                      struct ext4_group_desc *gdp);
3282 extern int ext4_register_li_request(struct super_block *sb,
3283                                     ext4_group_t first_not_zeroed);
3284
3285 static inline int ext4_has_metadata_csum(struct super_block *sb)
3286 {
3287         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3288                      !EXT4_SB(sb)->s_chksum_driver);
3289
3290         return ext4_has_feature_metadata_csum(sb) &&
3291                (EXT4_SB(sb)->s_chksum_driver != NULL);
3292 }
3293
3294 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3295 {
3296         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3297 }
3298
3299 #define ext4_read_incompat_64bit_val(es, name) \
3300         (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3301                 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3302                 le32_to_cpu(es->name##_lo))
3303
3304 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3305 {
3306         return ext4_read_incompat_64bit_val(es, s_blocks_count);
3307 }
3308
3309 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3310 {
3311         return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3312 }
3313
3314 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3315 {
3316         return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3317 }
3318
3319 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3320                                          ext4_fsblk_t blk)
3321 {
3322         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3323         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3324 }
3325
3326 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3327                                               ext4_fsblk_t blk)
3328 {
3329         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3330         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3331 }
3332
3333 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3334                                            ext4_fsblk_t blk)
3335 {
3336         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3337         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3338 }
3339
3340 static inline loff_t ext4_isize(struct super_block *sb,
3341                                 struct ext4_inode *raw_inode)
3342 {
3343         if (ext4_has_feature_largedir(sb) ||
3344             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3345                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3346                         le32_to_cpu(raw_inode->i_size_lo);
3347
3348         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3349 }
3350
3351 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3352 {
3353         raw_inode->i_size_lo = cpu_to_le32(i_size);
3354         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3355 }
3356
3357 static inline
3358 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3359                                             ext4_group_t group)
3360 {
3361          struct ext4_group_info **grp_info;
3362          long indexv, indexh;
3363          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3364          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3365          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3366          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3367          return grp_info[indexh];
3368 }
3369
3370 /*
3371  * Reading s_groups_count requires using smp_rmb() afterwards.  See
3372  * the locking protocol documented in the comments of ext4_group_add()
3373  * in resize.c
3374  */
3375 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3376 {
3377         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
3378
3379         smp_rmb();
3380         return ngroups;
3381 }
3382
3383 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3384                                              ext4_group_t block_group)
3385 {
3386         return block_group >> sbi->s_log_groups_per_flex;
3387 }
3388
3389 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3390 {
3391         return 1 << sbi->s_log_groups_per_flex;
3392 }
3393
3394 #define ext4_std_error(sb, errno)                               \
3395 do {                                                            \
3396         if ((errno))                                            \
3397                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
3398 } while (0)
3399
3400 #ifdef CONFIG_SMP
3401 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3402  * counters. So we need to make sure we have free clusters more
3403  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
3404  */
3405 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3406 #else
3407 #define EXT4_FREECLUSTERS_WATERMARK 0
3408 #endif
3409
3410 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3411 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3412 {
3413         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3414                      !inode_is_locked(inode));
3415         down_write(&EXT4_I(inode)->i_data_sem);
3416         if (newsize > EXT4_I(inode)->i_disksize)
3417                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3418         up_write(&EXT4_I(inode)->i_data_sem);
3419 }
3420
3421 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3422 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3423 {
3424         int changed = 0;
3425
3426         if (newsize > inode->i_size) {
3427                 i_size_write(inode, newsize);
3428                 changed = 1;
3429         }
3430         if (newsize > EXT4_I(inode)->i_disksize) {
3431                 ext4_update_i_disksize(inode, newsize);
3432                 changed |= 2;
3433         }
3434         return changed;
3435 }
3436
3437 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3438                                       loff_t len);
3439
3440 struct ext4_group_info {
3441         unsigned long   bb_state;
3442 #ifdef AGGRESSIVE_CHECK
3443         unsigned long   bb_check_counter;
3444 #endif
3445         struct rb_root  bb_free_root;
3446         ext4_grpblk_t   bb_first_free;  /* first free block */
3447         ext4_grpblk_t   bb_free;        /* total free blocks */
3448         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
3449         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
3450         ext4_group_t    bb_group;       /* Group number */
3451         struct          list_head bb_prealloc_list;
3452 #ifdef DOUBLE_CHECK
3453         void            *bb_bitmap;
3454 #endif
3455         struct rw_semaphore alloc_sem;
3456         struct rb_node  bb_avg_fragment_size_rb;
3457         struct list_head bb_largest_free_order_node;
3458         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
3459                                          * regions, index is order.
3460                                          * bb_counters[3] = 5 means
3461                                          * 5 free 8-block regions. */
3462 };
3463
3464 #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
3465 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
3466 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
3467 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
3468 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
3469         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3470 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
3471         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3472 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT        4
3473
3474 #define EXT4_MB_GRP_NEED_INIT(grp)      \
3475         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3476 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
3477         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3478 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
3479         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3480
3481 #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
3482         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3483 #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
3484         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3485 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
3486         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3487 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp)      \
3488         (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3489
3490 #define EXT4_MAX_CONTENTION             8
3491 #define EXT4_CONTENTION_THRESHOLD       2
3492
3493 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3494                                               ext4_group_t group)
3495 {
3496         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3497 }
3498
3499 /*
3500  * Returns true if the filesystem is busy enough that attempts to
3501  * access the block group locks has run into contention.
3502  */
3503 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3504 {
3505         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3506 }
3507
3508 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3509 {
3510         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3511         if (spin_trylock(lock))
3512                 /*
3513                  * We're able to grab the lock right away, so drop the
3514                  * lock contention counter.
3515                  */
3516                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3517         else {
3518                 /*
3519                  * The lock is busy, so bump the contention counter,
3520                  * and then wait on the spin lock.
3521                  */
3522                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3523                                   EXT4_MAX_CONTENTION);
3524                 spin_lock(lock);
3525         }
3526 }
3527
3528 static inline void ext4_unlock_group(struct super_block *sb,
3529                                         ext4_group_t group)
3530 {
3531         spin_unlock(ext4_group_lock_ptr(sb, group));
3532 }
3533
3534 #ifdef CONFIG_QUOTA
3535 static inline bool ext4_quota_capable(struct super_block *sb)
3536 {
3537         return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3538 }
3539
3540 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3541 {
3542         struct ext4_sb_info *sbi = EXT4_SB(sb);
3543
3544         return (ext4_has_feature_quota(sb) ||
3545                 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3546 }
3547 int ext4_enable_quotas(struct super_block *sb);
3548 #endif
3549
3550 /*
3551  * Block validity checking
3552  */
3553 #define ext4_check_indirect_blockref(inode, bh)                         \
3554         ext4_check_blockref(__func__, __LINE__, inode,                  \
3555                             (__le32 *)(bh)->b_data,                     \
3556                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3557
3558 #define ext4_ind_check_inode(inode)                                     \
3559         ext4_check_blockref(__func__, __LINE__, inode,                  \
3560                             EXT4_I(inode)->i_data,                      \
3561                             EXT4_NDIR_BLOCKS)
3562
3563 /*
3564  * Inodes and files operations
3565  */
3566
3567 /* dir.c */
3568 extern const struct file_operations ext4_dir_operations;
3569
3570 /* file.c */
3571 extern const struct inode_operations ext4_file_inode_operations;
3572 extern const struct file_operations ext4_file_operations;
3573 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3574
3575 /* inline.c */
3576 extern int ext4_get_max_inline_size(struct inode *inode);
3577 extern int ext4_find_inline_data_nolock(struct inode *inode);
3578 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3579                                  unsigned int len);
3580 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3581
3582 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3583 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3584                                          struct inode *inode,
3585                                          loff_t pos, unsigned len,
3586                                          unsigned flags,
3587                                          struct page **pagep);
3588 extern int ext4_write_inline_data_end(struct inode *inode,
3589                                       loff_t pos, unsigned len,
3590                                       unsigned copied,
3591                                       struct page *page);
3592 extern struct buffer_head *
3593 ext4_journalled_write_inline_data(struct inode *inode,
3594                                   unsigned len,
3595                                   struct page *page);
3596 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3597                                            struct inode *inode,
3598                                            loff_t pos, unsigned len,
3599                                            unsigned flags,
3600                                            struct page **pagep,
3601                                            void **fsdata);
3602 extern int ext4_try_add_inline_entry(handle_t *handle,
3603                                      struct ext4_filename *fname,
3604                                      struct inode *dir, struct inode *inode);
3605 extern int ext4_try_create_inline_dir(handle_t *handle,
3606                                       struct inode *parent,
3607                                       struct inode *inode);
3608 extern int ext4_read_inline_dir(struct file *filp,
3609                                 struct dir_context *ctx,
3610                                 int *has_inline_data);
3611 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3612                                   struct inode *dir, ext4_lblk_t block,
3613                                   struct dx_hash_info *hinfo,
3614                                   __u32 start_hash, __u32 start_minor_hash,
3615                                   int *has_inline_data);
3616 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3617                                         struct ext4_filename *fname,
3618                                         struct ext4_dir_entry_2 **res_dir,
3619                                         int *has_inline_data);
3620 extern int ext4_delete_inline_entry(handle_t *handle,
3621                                     struct inode *dir,
3622                                     struct ext4_dir_entry_2 *de_del,
3623                                     struct buffer_head *bh,
3624                                     int *has_inline_data);
3625 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3626 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3627                                         struct ext4_dir_entry_2 **parent_de,
3628                                         int *retval);
3629 extern int ext4_inline_data_fiemap(struct inode *inode,
3630                                    struct fiemap_extent_info *fieinfo,
3631                                    int *has_inline, __u64 start, __u64 len);
3632
3633 struct iomap;
3634 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3635
3636 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3637
3638 extern int ext4_convert_inline_data(struct inode *inode);
3639
3640 static inline int ext4_has_inline_data(struct inode *inode)
3641 {
3642         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3643                EXT4_I(inode)->i_inline_off;
3644 }
3645
3646 /* namei.c */
3647 extern const struct inode_operations ext4_dir_inode_operations;
3648 extern const struct inode_operations ext4_special_inode_operations;
3649 extern struct dentry *ext4_get_parent(struct dentry *child);
3650 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3651                                  struct ext4_dir_entry_2 *de,
3652                                  int blocksize, int csum_size,
3653                                  unsigned int parent_ino, int dotdot_real_len);
3654 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3655                                         unsigned int blocksize);
3656 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3657                                       struct buffer_head *bh);
3658 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3659                          struct inode *inode);
3660 extern int __ext4_link(struct inode *dir, struct inode *inode,
3661                        struct dentry *dentry);
3662
3663 #define S_SHIFT 12
3664 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3665         [S_IFREG >> S_SHIFT]    = EXT4_FT_REG_FILE,
3666         [S_IFDIR >> S_SHIFT]    = EXT4_FT_DIR,
3667         [S_IFCHR >> S_SHIFT]    = EXT4_FT_CHRDEV,
3668         [S_IFBLK >> S_SHIFT]    = EXT4_FT_BLKDEV,
3669         [S_IFIFO >> S_SHIFT]    = EXT4_FT_FIFO,
3670         [S_IFSOCK >> S_SHIFT]   = EXT4_FT_SOCK,
3671         [S_IFLNK >> S_SHIFT]    = EXT4_FT_SYMLINK,
3672 };
3673
3674 static inline void ext4_set_de_type(struct super_block *sb,
3675                                 struct ext4_dir_entry_2 *de,
3676                                 umode_t mode) {
3677         if (ext4_has_feature_filetype(sb))
3678                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3679 }
3680
3681 /* readpages.c */
3682 extern int ext4_mpage_readpages(struct inode *inode,
3683                 struct readahead_control *rac, struct page *page);
3684 extern int __init ext4_init_post_read_processing(void);
3685 extern void ext4_exit_post_read_processing(void);
3686
3687 /* symlink.c */
3688 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3689 extern const struct inode_operations ext4_symlink_inode_operations;
3690 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3691
3692 /* sysfs.c */
3693 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3694 extern int ext4_register_sysfs(struct super_block *sb);
3695 extern void ext4_unregister_sysfs(struct super_block *sb);
3696 extern int __init ext4_init_sysfs(void);
3697 extern void ext4_exit_sysfs(void);
3698
3699 /* block_validity */
3700 extern void ext4_release_system_zone(struct super_block *sb);
3701 extern int ext4_setup_system_zone(struct super_block *sb);
3702 extern int __init ext4_init_system_zone(void);
3703 extern void ext4_exit_system_zone(void);
3704 extern int ext4_inode_block_valid(struct inode *inode,
3705                                   ext4_fsblk_t start_blk,
3706                                   unsigned int count);
3707 extern int ext4_check_blockref(const char *, unsigned int,
3708                                struct inode *, __le32 *, unsigned int);
3709
3710 /* extents.c */
3711 struct ext4_ext_path;
3712 struct ext4_extent;
3713
3714 /*
3715  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3716  * __le32.
3717  */
3718 #define EXT_MAX_BLOCKS  0xffffffff
3719
3720 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3721 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3722 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3723                                struct ext4_map_blocks *map, int flags);
3724 extern int ext4_ext_truncate(handle_t *, struct inode *);
3725 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3726                                  ext4_lblk_t end);
3727 extern void ext4_ext_init(struct super_block *);
3728 extern void ext4_ext_release(struct super_block *);
3729 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3730                           loff_t len);
3731 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3732                                           loff_t offset, ssize_t len);
3733 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3734                                              ext4_io_end_t *io_end);
3735 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3736                            struct ext4_map_blocks *map, int flags);
3737 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3738                                                    int num,
3739                                                    struct ext4_ext_path *path);
3740 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3741                                   struct ext4_ext_path **,
3742                                   struct ext4_extent *, int);
3743 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3744                                               struct ext4_ext_path **,
3745                                               int flags);
3746 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3747 extern int ext4_ext_check_inode(struct inode *inode);
3748 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3749 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3750                         __u64 start, __u64 len);
3751 extern int ext4_get_es_cache(struct inode *inode,
3752                              struct fiemap_extent_info *fieinfo,
3753                              __u64 start, __u64 len);
3754 extern int ext4_ext_precache(struct inode *inode);
3755 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3756                                 struct inode *inode2, ext4_lblk_t lblk1,
3757                              ext4_lblk_t lblk2,  ext4_lblk_t count,
3758                              int mark_unwritten,int *err);
3759 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3760 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3761                                        int check_cred, int restart_cred,
3762                                        int revoke_cred);
3763 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3764 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3765 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3766                 int len, int unwritten, ext4_fsblk_t pblk);
3767 extern int ext4_ext_clear_bb(struct inode *inode);
3768
3769
3770 /* move_extent.c */
3771 extern void ext4_double_down_write_data_sem(struct inode *first,
3772                                             struct inode *second);
3773 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3774                                           struct inode *donor_inode);
3775 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3776                              __u64 start_orig, __u64 start_donor,
3777                              __u64 len, __u64 *moved_len);
3778
3779 /* page-io.c */
3780 extern int __init ext4_init_pageio(void);
3781 extern void ext4_exit_pageio(void);
3782 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3783 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3784 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3785 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3786 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3787                                 struct writeback_control *wbc);
3788 extern void ext4_end_io_rsv_work(struct work_struct *work);
3789 extern void ext4_io_submit(struct ext4_io_submit *io);
3790 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3791                                struct page *page,
3792                                int len,
3793                                bool keep_towrite);
3794 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3795 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3796
3797 /* mmp.c */
3798 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3799
3800 /* mmp.c */
3801 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3802
3803 /* verity.c */
3804 extern const struct fsverity_operations ext4_verityops;
3805
3806 /* orphan.c */
3807 extern int ext4_orphan_add(handle_t *, struct inode *);
3808 extern int ext4_orphan_del(handle_t *, struct inode *);
3809 extern void ext4_orphan_cleanup(struct super_block *sb,
3810                                 struct ext4_super_block *es);
3811 extern void ext4_release_orphan_info(struct super_block *sb);
3812 extern int ext4_init_orphan_info(struct super_block *sb);
3813 extern int ext4_orphan_file_empty(struct super_block *sb);
3814 extern void ext4_orphan_file_block_trigger(
3815                                 struct jbd2_buffer_trigger_type *triggers,
3816                                 struct buffer_head *bh,
3817                                 void *data, size_t size);
3818
3819 /*
3820  * Add new method to test whether block and inode bitmaps are properly
3821  * initialized. With uninit_bg reading the block from disk is not enough
3822  * to mark the bitmap uptodate. We need to also zero-out the bitmap
3823  */
3824 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3825
3826 static inline int bitmap_uptodate(struct buffer_head *bh)
3827 {
3828         return (buffer_uptodate(bh) &&
3829                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3830 }
3831 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3832 {
3833         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3834 }
3835
3836 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3837
3838 /* For ioend & aio unwritten conversion wait queues */
3839 #define EXT4_WQ_HASH_SZ         37
3840 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
3841                                             EXT4_WQ_HASH_SZ])
3842 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3843
3844 extern int ext4_resize_begin(struct super_block *sb);
3845 extern void ext4_resize_end(struct super_block *sb);
3846
3847 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3848                                               struct ext4_io_end *io_end)
3849 {
3850         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3851                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3852                 atomic_inc(&EXT4_I(inode)->i_unwritten);
3853         }
3854 }
3855
3856 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3857 {
3858         struct inode *inode = io_end->inode;
3859
3860         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3861                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3862                 /* Wake up anyone waiting on unwritten extent conversion */
3863                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3864                         wake_up_all(ext4_ioend_wq(inode));
3865         }
3866 }
3867
3868 extern const struct iomap_ops ext4_iomap_ops;
3869 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3870 extern const struct iomap_ops ext4_iomap_report_ops;
3871
3872 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3873 {
3874         /*
3875          * If the buffer has the write error flag, we have failed
3876          * to write out data in the block.  In this  case, we don't
3877          * have to read the block because we may read the old data
3878          * successfully.
3879          */
3880         if (buffer_write_io_error(bh))
3881                 set_buffer_uptodate(bh);
3882         return buffer_uptodate(bh);
3883 }
3884
3885 #endif  /* __KERNEL__ */
3886
3887 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
3888 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
3889
3890 #endif  /* _EXT4_H */